diff options
39 files changed, 6393 insertions, 6 deletions
diff --git a/include/linux/netfilter.h b/include/linux/netfilter.h index fef7e67f7101..2077489f9887 100644 --- a/include/linux/netfilter.h +++ b/include/linux/netfilter.h @@ -53,12 +53,13 @@ struct nf_hook_ops { struct list_head list; /* User fills in from here down. */ - nf_hookfn *hook; - struct module *owner; - u_int8_t pf; - unsigned int hooknum; + nf_hookfn *hook; + struct module *owner; + void *priv; + u_int8_t pf; + unsigned int hooknum; /* Hooks are ordered in ascending priority. */ - int priority; + int priority; }; struct nf_sockopt_ops { diff --git a/include/net/netfilter/nf_tables.h b/include/net/netfilter/nf_tables.h new file mode 100644 index 000000000000..d26dfa345f49 --- /dev/null +++ b/include/net/netfilter/nf_tables.h @@ -0,0 +1,301 @@ +#ifndef _NET_NF_TABLES_H +#define _NET_NF_TABLES_H + +#include <linux/list.h> +#include <linux/netfilter.h> +#include <linux/netfilter/nf_tables.h> +#include <net/netlink.h> + +struct nft_pktinfo { + struct sk_buff *skb; + const struct net_device *in; + const struct net_device *out; + u8 hooknum; + u8 nhoff; + u8 thoff; +}; + +struct nft_data { + union { + u32 data[4]; + struct { + u32 verdict; + struct nft_chain *chain; + }; + }; +} __attribute__((aligned(__alignof__(u64)))); + +static inline int nft_data_cmp(const struct nft_data *d1, + const struct nft_data *d2, + unsigned int len) +{ + return memcmp(d1->data, d2->data, len); +} + +static inline void nft_data_copy(struct nft_data *dst, + const struct nft_data *src) +{ + BUILD_BUG_ON(__alignof__(*dst) != __alignof__(u64)); + *(u64 *)&dst->data[0] = *(u64 *)&src->data[0]; + *(u64 *)&dst->data[2] = *(u64 *)&src->data[2]; +} + +static inline void nft_data_debug(const struct nft_data *data) +{ + pr_debug("data[0]=%x data[1]=%x data[2]=%x data[3]=%x\n", + data->data[0], data->data[1], + data->data[2], data->data[3]); +} + +/** + * struct nft_ctx - nf_tables rule context + * + * @afi: address family info + * @table: the table the chain is contained in + * @chain: the chain the rule is contained in + */ +struct nft_ctx { + const struct nft_af_info *afi; + const struct nft_table *table; + const struct nft_chain *chain; +}; + +enum nft_data_types { + NFT_DATA_VALUE, + NFT_DATA_VERDICT, +}; + +struct nft_data_desc { + enum nft_data_types type; + unsigned int len; +}; + +extern int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data, + struct nft_data_desc *desc, const struct nlattr *nla); +extern void nft_data_uninit(const struct nft_data *data, + enum nft_data_types type); +extern int nft_data_dump(struct sk_buff *skb, int attr, + const struct nft_data *data, + enum nft_data_types type, unsigned int len); + +static inline enum nft_data_types nft_dreg_to_type(enum nft_registers reg) +{ + return reg == NFT_REG_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE; +} + +extern int nft_validate_input_register(enum nft_registers reg); +extern int nft_validate_output_register(enum nft_registers reg); +extern int nft_validate_data_load(const struct nft_ctx *ctx, + enum nft_registers reg, + const struct nft_data *data, + enum nft_data_types type); + +/** + * struct nft_expr_ops - nf_tables expression operations + * + * @eval: Expression evaluation function + * @init: initialization function + * @destroy: destruction function + * @dump: function to dump parameters + * @list: used internally + * @name: Identifier + * @owner: module reference + * @policy: netlink attribute policy + * @maxattr: highest netlink attribute number + * @size: full expression size, including private data size + */ +struct nft_expr; +struct nft_expr_ops { + void (*eval)(const struct nft_expr *expr, + struct nft_data data[NFT_REG_MAX + 1], + const struct nft_pktinfo *pkt); + int (*init)(const struct nft_ctx *ctx, + const struct nft_expr *expr, + const struct nlattr * const tb[]); + void (*destroy)(const struct nft_expr *expr); + int (*dump)(struct sk_buff *skb, + const struct nft_expr *expr); + + struct list_head list; + const char *name; + struct module *owner; + const struct nla_policy *policy; + unsigned int maxattr; + unsigned int size; +}; + +#define NFT_EXPR_SIZE(size) (sizeof(struct nft_expr) + \ + ALIGN(size, __alignof__(struct nft_expr))) + +/** + * struct nft_expr - nf_tables expression + * + * @ops: expression ops + * @data: expression private data + */ +struct nft_expr { + const struct nft_expr_ops *ops; + unsigned char data[]; +}; + +static inline void *nft_expr_priv(const struct nft_expr *expr) +{ + return (void *)expr->data; +} + +/** + * struct nft_rule - nf_tables rule + * + * @list: used internally + * @rcu_head: used internally for rcu + * @handle: rule handle + * @dlen: length of expression data + * @data: expression data + */ +struct nft_rule { + struct list_head list; + struct rcu_head rcu_head; + u64 handle:48, + dlen:16; + unsigned char data[] + __attribute__((aligned(__alignof__(struct nft_expr)))); +}; + +static inline struct nft_expr *nft_expr_first(const struct nft_rule *rule) +{ + return (struct nft_expr *)&rule->data[0]; +} + +static inline struct nft_expr *nft_expr_next(const struct nft_expr *expr) +{ + return ((void *)expr) + expr->ops->size; +} + +static inline struct nft_expr *nft_expr_last(const struct nft_rule *rule) +{ + return (struct nft_expr *)&rule->data[rule->dlen]; +} + +/* + * The last pointer isn't really necessary, but the compiler isn't able to + * determine that the result of nft_expr_last() is always the same since it + * can't assume that the dlen value wasn't changed within calls in the loop. + */ +#define nft_rule_for_each_expr(expr, last, rule) \ + for ((expr) = nft_expr_first(rule), (last) = nft_expr_last(rule); \ + (expr) != (last); \ + (expr) = nft_expr_next(expr)) + +enum nft_chain_flags { + NFT_BASE_CHAIN = 0x1, + NFT_CHAIN_BUILTIN = 0x2, +}; + +/** + * struct nft_chain - nf_tables chain + * + * @rules: list of rules in the chain + * @list: used internally + * @rcu_head: used internally + * @handle: chain handle + * @flags: bitmask of enum nft_chain_flags + * @use: number of jump references to this chain + * @level: length of longest path to this chain + * @name: name of the chain + */ +struct nft_chain { + struct list_head rules; + struct list_head list; + struct rcu_head rcu_head; + u64 handle; + u8 flags; + u16 use; + u16 level; + char name[NFT_CHAIN_MAXNAMELEN]; +}; + +/** + * struct nft_base_chain - nf_tables base chain + * + * @ops: netfilter hook ops + * @chain: the chain + */ +struct nft_base_chain { + struct nf_hook_ops ops; + struct nft_chain chain; +}; + +static inline struct nft_base_chain *nft_base_chain(const struct nft_chain *chain) +{ + return container_of(chain, struct nft_base_chain, chain); +} + +extern unsigned int nft_do_chain(const struct nf_hook_ops *ops, + struct sk_buff *skb, + const struct net_device *in, + const struct net_device *out, + int (*okfn)(struct sk_buff *)); + +enum nft_table_flags { + NFT_TABLE_BUILTIN = 0x1, +}; + +/** + * struct nft_table - nf_tables table + * + * @list: used internally + * @chains: chains in the table + * @sets: sets in the table + * @hgenerator: handle generator state + * @use: number of chain references to this table + * @flags: table flag (see enum nft_table_flags) + * @name: name of the table + */ +struct nft_table { + struct list_head list; + struct list_head chains; + struct list_head sets; + u64 hgenerator; + u32 use; + u16 flags; + char name[]; +}; + +/** + * struct nft_af_info - nf_tables address family info + * + * @list: used internally + * @family: address family + * @nhooks: number of hooks in this family + * @owner: module owner + * @tables: used internally + * @hooks: hookfn overrides for packet validation + */ +struct nft_af_info { + struct list_head list; + int family; + unsigned int nhooks; + struct module *owner; + struct list_head tables; + nf_hookfn *hooks[NF_MAX_HOOKS]; +}; + +extern int nft_register_afinfo(struct nft_af_info *); +extern void nft_unregister_afinfo(struct nft_af_info *); + +extern int nft_register_table(struct nft_table *, int family); +extern void nft_unregister_table(struct nft_table *, int family); + +extern int nft_register_expr(struct nft_expr_ops *); +extern void nft_unregister_expr(struct nft_expr_ops *); + +#define MODULE_ALIAS_NFT_FAMILY(family) \ + MODULE_ALIAS("nft-afinfo-" __stringify(family)) + +#define MODULE_ALIAS_NFT_TABLE(family, name) \ + MODULE_ALIAS("nft-table-" __stringify(family) "-" name) + +#define MODULE_ALIAS_NFT_EXPR(name) \ + MODULE_ALIAS("nft-expr-" name) + +#endif /* _NET_NF_TABLES_H */ diff --git a/include/net/netfilter/nf_tables_core.h b/include/net/netfilter/nf_tables_core.h new file mode 100644 index 000000000000..283396c916e0 --- /dev/null +++ b/include/net/netfilter/nf_tables_core.h @@ -0,0 +1,25 @@ +#ifndef _NET_NF_TABLES_CORE_H +#define _NET_NF_TABLES_CORE_H + +extern int nf_tables_core_module_init(void); +extern void nf_tables_core_module_exit(void); + +extern int nft_immediate_module_init(void); +extern void nft_immediate_module_exit(void); + +extern int nft_cmp_module_init(void); +extern void nft_cmp_module_exit(void); + +extern int nft_lookup_module_init(void); +extern void nft_lookup_module_exit(void); + +extern int nft_bitwise_module_init(void); +extern void nft_bitwise_module_exit(void); + +extern int nft_byteorder_module_init(void); +extern void nft_byteorder_module_exit(void); + +extern int nft_payload_module_init(void); +extern void nft_payload_module_exit(void); + +#endif /* _NET_NF_TABLES_CORE_H */ diff --git a/include/uapi/linux/netfilter/Kbuild b/include/uapi/linux/netfilter/Kbuild index 174915420d3f..6ce0b7f566a7 100644 --- a/include/uapi/linux/netfilter/Kbuild +++ b/include/uapi/linux/netfilter/Kbuild @@ -5,6 +5,7 @@ header-y += nf_conntrack_ftp.h header-y += nf_conntrack_sctp.h header-y += nf_conntrack_tcp.h header-y += nf_conntrack_tuple_common.h +header-y += nf_tables.h header-y += nf_nat.h header-y += nfnetlink.h header-y += nfnetlink_acct.h diff --git a/include/uapi/linux/netfilter/nf_conntrack_common.h b/include/uapi/linux/netfilter/nf_conntrack_common.h index 8dd803818ebe..319f47128db8 100644 --- a/include/uapi/linux/netfilter/nf_conntrack_common.h +++ b/include/uapi/linux/netfilter/nf_conntrack_common.h @@ -25,6 +25,10 @@ enum ip_conntrack_info { IP_CT_NUMBER = IP_CT_IS_REPLY * 2 - 1 }; +#define NF_CT_STATE_INVALID_BIT (1 << 0) +#define NF_CT_STATE_BIT(ctinfo) (1 << ((ctinfo) % IP_CT_IS_REPLY + 1)) +#define NF_CT_STATE_UNTRACKED_BIT (1 << (IP_CT_NUMBER + 1)) + /* Bitset representing status of connection. */ enum ip_conntrack_status { /* It's an expected connection: bit 0 set. This bit never changed */ diff --git a/include/uapi/linux/netfilter/nf_tables.h b/include/uapi/linux/netfilter/nf_tables.h new file mode 100644 index 000000000000..ec6d84a8ed1e --- /dev/null +++ b/include/uapi/linux/netfilter/nf_tables.h @@ -0,0 +1,582 @@ +#ifndef _LINUX_NF_TABLES_H +#define _LINUX_NF_TABLES_H + +#define NFT_CHAIN_MAXNAMELEN 32 + +enum nft_registers { + NFT_REG_VERDICT, + NFT_REG_1, + NFT_REG_2, + NFT_REG_3, + NFT_REG_4, + __NFT_REG_MAX +}; +#define NFT_REG_MAX (__NFT_REG_MAX - 1) + +/** + * enum nft_verdicts - nf_tables internal verdicts + * + * @NFT_CONTINUE: continue evaluation of the current rule + * @NFT_BREAK: terminate evaluation of the current rule + * @NFT_JUMP: push the current chain on the jump stack and jump to a chain + * @NFT_GOTO: jump to a chain without pushing the current chain on the jump stack + * @NFT_RETURN: return to the topmost chain on the jump stack + * + * The nf_tables verdicts share their numeric space with the netfilter verdicts. + */ +enum nft_verdicts { + NFT_CONTINUE = -1, + NFT_BREAK = -2, + NFT_JUMP = -3, + NFT_GOTO = -4, + NFT_RETURN = -5, +}; + +/** + * enum nf_tables_msg_types - nf_tables netlink message types + * + * @NFT_MSG_NEWTABLE: create a new table (enum nft_table_attributes) + * @NFT_MSG_GETTABLE: get a table (enum nft_table_attributes) + * @NFT_MSG_DELTABLE: delete a table (enum nft_table_attributes) + * @NFT_MSG_NEWCHAIN: create a new chain (enum nft_chain_attributes) + * @NFT_MSG_GETCHAIN: get a chain (enum nft_chain_attributes) + * @NFT_MSG_DELCHAIN: delete a chain (enum nft_chain_attributes) + * @NFT_MSG_NEWRULE: create a new rule (enum nft_rule_attributes) + * @NFT_MSG_GETRULE: get a rule (enum nft_rule_attributes) + * @NFT_MSG_DELRULE: delete a rule (enum nft_rule_attributes) + */ +enum nf_tables_msg_types { + NFT_MSG_NEWTABLE, + NFT_MSG_GETTABLE, + NFT_MSG_DELTABLE, + NFT_MSG_NEWCHAIN, + NFT_MSG_GETCHAIN, + NFT_MSG_DELCHAIN, + NFT_MSG_NEWRULE, + NFT_MSG_GETRULE, + NFT_MSG_DELRULE, + NFT_MSG_MAX, +}; + +enum nft_list_attributes { + NFTA_LIST_UNPEC, + NFTA_LIST_ELEM, + __NFTA_LIST_MAX +}; +#define NFTA_LIST_MAX (__NFTA_LIST_MAX - 1) + +/** + * enum nft_hook_attributes - nf_tables netfilter hook netlink attributes + * + * @NFTA_HOOK_HOOKNUM: netfilter hook number (NLA_U32) + * @NFTA_HOOK_PRIORITY: netfilter hook priority (NLA_U32) + */ +enum nft_hook_attributes { + NFTA_HOOK_UNSPEC, + NFTA_HOOK_HOOKNUM, + NFTA_HOOK_PRIORITY, + __NFTA_HOOK_MAX +}; +#define NFTA_HOOK_MAX (__NFTA_HOOK_MAX - 1) + +/** + * enum nft_table_attributes - nf_tables table netlink attributes + * + * @NFTA_TABLE_NAME: name of the table (NLA_STRING) + */ +enum nft_table_attributes { + NFTA_TABLE_UNSPEC, + NFTA_TABLE_NAME, + __NFTA_TABLE_MAX +}; +#define NFTA_TABLE_MAX (__NFTA_TABLE_MAX - 1) + +/** + * enum nft_chain_attributes - nf_tables chain netlink attributes + * + * @NFTA_CHAIN_TABLE: name of the table containing the chain (NLA_STRING) + * @NFTA_CHAIN_HANDLE: numeric handle of the chain (NLA_U64) + * @NFTA_CHAIN_NAME: name of the chain (NLA_STRING) + * @NFTA_CHAIN_HOOK: hook specification for basechains (NLA_NESTED: nft_hook_attributes) + */ +enum nft_chain_attributes { + NFTA_CHAIN_UNSPEC, + NFTA_CHAIN_TABLE, + NFTA_CHAIN_HANDLE, + NFTA_CHAIN_NAME, + NFTA_CHAIN_HOOK, + __NFTA_CHAIN_MAX +}; +#define NFTA_CHAIN_MAX (__NFTA_CHAIN_MAX - 1) + +/** + * enum nft_rule_attributes - nf_tables rule netlink attributes + * + * @NFTA_RULE_TABLE: name of the table containing the rule (NLA_STRING) + * @NFTA_RULE_CHAIN: name of the chain containing the rule (NLA_STRING) + * @NFTA_RULE_HANDLE: numeric handle of the rule (NLA_U64) + * @NFTA_RULE_EXPRESSIONS: list of expressions (NLA_NESTED: nft_expr_attributes) + */ +enum nft_rule_attributes { + NFTA_RULE_UNSPEC, + NFTA_RULE_TABLE, + NFTA_RULE_CHAIN, + NFTA_RULE_HANDLE, + NFTA_RULE_EXPRESSIONS, + __NFTA_RULE_MAX +}; +#define NFTA_RULE_MAX (__NFTA_RULE_MAX - 1) + +enum nft_data_attributes { + NFTA_DATA_UNSPEC, + NFTA_DATA_VALUE, + NFTA_DATA_VERDICT, + __NFTA_DATA_MAX +}; +#define NFTA_DATA_MAX (__NFTA_DATA_MAX - 1) + +/** + * enum nft_verdict_attributes - nf_tables verdict netlink attributes + * + * @NFTA_VERDICT_CODE: nf_tables verdict (NLA_U32: enum nft_verdicts) + * @NFTA_VERDICT_CHAIN: jump target chain name (NLA_STRING) + */ +enum nft_verdict_attributes { + NFTA_VERDICT_UNSPEC, + NFTA_VERDICT_CODE, + NFTA_VERDICT_CHAIN, + __NFTA_VERDICT_MAX +}; +#define NFTA_VERDICT_MAX (__NFTA_VERDICT_MAX - 1) + +/** + * enum nft_expr_attributes - nf_tables expression netlink attributes + * + * @NFTA_EXPR_NAME: name of the expression type (NLA_STRING) + * @NFTA_EXPR_DATA: type specific data (NLA_NESTED) + */ +enum nft_expr_attributes { + NFTA_EXPR_UNSPEC, + NFTA_EXPR_NAME, + NFTA_EXPR_DATA, + __NFTA_EXPR_MAX +}; +#define NFTA_EXPR_MAX (__NFTA_EXPR_MAX - 1) + +/** + * enum nft_immediate_attributes - nf_tables immediate expression netlink attributes + * + * @NFTA_IMMEDIATE_DREG: destination register to load data into (NLA_U32) + * @NFTA_IMMEDIATE_DATA: data to load (NLA_NESTED: nft_data_attributes) + */ +enum nft_immediate_attributes { + NFTA_IMMEDIATE_UNSPEC, + NFTA_IMMEDIATE_DREG, + NFTA_IMMEDIATE_DATA, + __NFTA_IMMEDIATE_MAX +}; +#define NFTA_IMMEDIATE_MAX (__NFTA_IMMEDIATE_MAX - 1) + +/** + * enum nft_bitwise_attributes - nf_tables bitwise expression netlink attributes + * + * @NFTA_BITWISE_SREG: source register (NLA_U32: nft_registers) + * @NFTA_BITWISE_DREG: destination register (NLA_U32: nft_registers) + * @NFTA_BITWISE_LEN: length of operands (NLA_U32) + * @NFTA_BITWISE_MASK: mask value (NLA_NESTED: nft_data_attributes) + * @NFTA_BITWISE_XOR: xor value (NLA_NESTED: nft_data_attributes) + * + * The bitwise expression performs the following operation: + * + * dreg = (sreg & mask) ^ xor + * + * which allow to express all bitwise operations: + * + * mask xor + * NOT: 1 1 + * OR: 0 x + * XOR: 1 x + * AND: x 0 + */ +enum nft_bitwise_attributes { + NFTA_BITWISE_UNSPEC, + NFTA_BITWISE_SREG, + NFTA_BITWISE_DREG, + NFTA_BITWISE_LEN, + NFTA_BITWISE_MASK, + NFTA_BITWISE_XOR, + __NFTA_BITWISE_MAX +}; +#define NFTA_BITWISE_MAX (__NFTA_BITWISE_MAX - 1) + +/** + * enum nft_byteorder_ops - nf_tables byteorder operators + * + * @NFT_BYTEORDER_NTOH: network to host operator + * @NFT_BYTEORDER_HTON: host to network opertaor + */ +enum nft_byteorder_ops { + NFT_BYTEORDER_NTOH, + NFT_BYTEORDER_HTON, +}; + +/** + * enum nft_byteorder_attributes - nf_tables byteorder expression netlink attributes + * + * @NFTA_BYTEORDER_SREG: source register (NLA_U32: nft_registers) + * @NFTA_BYTEORDER_DREG: destination register (NLA_U32: nft_registers) + * @NFTA_BYTEORDER_OP: operator (NLA_U32: enum nft_byteorder_ops) + * @NFTA_BYTEORDER_LEN: length of the data (NLA_U32) + * @NFTA_BYTEORDER_SIZE: data size in bytes (NLA_U32: 2 or 4) + */ +enum nft_byteorder_attributes { + NFTA_BYTEORDER_UNSPEC, + NFTA_BYTEORDER_SREG, + NFTA_BYTEORDER_DREG, + NFTA_BYTEORDER_OP, + NFTA_BYTEORDER_LEN, + NFTA_BYTEORDER_SIZE, + __NFTA_BYTEORDER_MAX +}; +#define NFTA_BYTEORDER_MAX (__NFTA_BYTEORDER_MAX - 1) + +/** + * enum nft_cmp_ops - nf_tables relational operator + * + * @NFT_CMP_EQ: equal + * @NFT_CMP_NEQ: not equal + * @NFT_CMP_LT: less than + * @NFT_CMP_LTE: less than or equal to + * @NFT_CMP_GT: greater than + * @NFT_CMP_GTE: greater than or equal to + */ +enum nft_cmp_ops { + NFT_CMP_EQ, + NFT_CMP_NEQ, + NFT_CMP_LT, + NFT_CMP_LTE, + NFT_CMP_GT, + NFT_CMP_GTE, +}; + +/** + * enum nft_cmp_attributes - nf_tables cmp expression netlink attributes + * + * @NFTA_CMP_SREG: source register of data to compare (NLA_U32: nft_registers) + * @NFTA_CMP_OP: cmp operation (NLA_U32: nft_cmp_ops) + * @NFTA_CMP_DATA: data to compare against (NLA_NESTED: nft_data_attributes) + */ +enum nft_cmp_attributes { + NFTA_CMP_UNSPEC, + NFTA_CMP_SREG, + NFTA_CMP_OP, + NFTA_CMP_DATA, + __NFTA_CMP_MAX +}; +#define NFTA_CMP_MAX (__NFTA_CMP_MAX - 1) + +enum nft_set_elem_flags { + NFT_SE_INTERVAL_END = 0x1, +}; + +enum nft_set_elem_attributes { + NFTA_SE_UNSPEC, + NFTA_SE_KEY, + NFTA_SE_DATA, + NFTA_SE_FLAGS, + __NFTA_SE_MAX +}; +#define NFTA_SE_MAX (__NFTA_SE_MAX - 1) + +enum nft_set_flags { + NFT_SET_INTERVAL = 0x1, + NFT_SET_MAP = 0x2, +}; + +enum nft_set_attributes { + NFTA_SET_UNSPEC, + NFTA_SET_FLAGS, + NFTA_SET_SREG, + NFTA_SET_DREG, + NFTA_SET_KLEN, + NFTA_SET_DLEN, + NFTA_SET_ELEMENTS, + __NFTA_SET_MAX +}; +#define NFTA_SET_MAX (__NFTA_SET_MAX - 1) + +enum nft_hash_flags { + NFT_HASH_MAP = 0x1, +}; + +enum nft_hash_elem_attributes { + NFTA_HE_UNSPEC, + NFTA_HE_KEY, + NFTA_HE_DATA, + __NFTA_HE_MAX +}; +#define NFTA_HE_MAX (__NFTA_HE_MAX - 1) + +enum nft_hash_attributes { + NFTA_HASH_UNSPEC, + NFTA_HASH_FLAGS, + NFTA_HASH_SREG, + NFTA_HASH_DREG, + NFTA_HASH_KLEN, + NFTA_HASH_ELEMENTS, + __NFTA_HASH_MAX +}; +#define NFTA_HASH_MAX (__NFTA_HASH_MAX - 1) + +/** + * enum nft_payload_bases - nf_tables payload expression offset bases + * + * @NFT_PAYLOAD_LL_HEADER: link layer header + * @NFT_PAYLOAD_NETWORK_HEADER: network header + * @NFT_PAYLOAD_TRANSPORT_HEADER: transport header + */ +enum nft_payload_bases { + NFT_PAYLOAD_LL_HEADER, + NFT_PAYLOAD_NETWORK_HEADER, + NFT_PAYLOAD_TRANSPORT_HEADER, +}; + +/** + * enum nft_payload_attributes - nf_tables payload expression netlink attributes + * + * @NFTA_PAYLOAD_DREG: destination register to load data into (NLA_U32: nft_registers) + * @NFTA_PAYLOAD_BASE: payload base (NLA_U32: nft_payload_bases) + * @NFTA_PAYLOAD_OFFSET: payload offset relative to base (NLA_U32) + * @NFTA_PAYLOAD_LEN: payload length (NLA_U32) + */ +enum nft_payload_attributes { + NFTA_PAYLOAD_UNSPEC, + NFTA_PAYLOAD_DREG, + NFTA_PAYLOAD_BASE, + NFTA_PAYLOAD_OFFSET, + NFTA_PAYLOAD_LEN, + __NFTA_PAYLOAD_MAX +}; +#define NFTA_PAYLOAD_MAX (__NFTA_PAYLOAD_MAX - 1) + +/** + * enum nft_exthdr_attributes - nf_tables IPv6 extension header expression netlink attributes + * + * @NFTA_EXTHDR_DREG: destination register (NLA_U32: nft_registers) + * @NFTA_EXTHDR_TYPE: extension header type (NLA_U8) + * @NFTA_EXTHDR_OFFSET: extension header offset (NLA_U32) + * @NFTA_EXTHDR_LEN: extension header length (NLA_U32) + */ +enum nft_exthdr_attributes { + NFTA_EXTHDR_UNSPEC, + NFTA_EXTHDR_DREG, + NFTA_EXTHDR_TYPE, + NFTA_EXTHDR_OFFSET, + NFTA_EXTHDR_LEN, + __NFTA_EXTHDR_MAX +}; +#define NFTA_EXTHDR_MAX (__NFTA_EXTHDR_MAX - 1) + +/** + * enum nft_meta_keys - nf_tables meta expression keys + * + * @NFT_META_LEN: packet length (skb->len) + * @NFT_META_PROTOCOL: packet ethertype protocol (skb->protocol), invalid in OUTPUT + * @NFT_META_PRIORITY: packet priority (skb->priority) + * @NFT_META_MARK: packet mark (skb->mark) + * @NFT_META_IIF: packet input interface index (dev->ifindex) + * @NFT_META_OIF: packet output interface index (dev->ifindex) + * @NFT_META_IIFNAME: packet input interface name (dev->name) + * @NFT_META_OIFNAME: packet output interface name (dev->name) + * @NFT_META_IIFTYPE: packet input interface type (dev->type) + * @NFT_META_OIFTYPE: packet output interface type (dev->type) + * @NFT_META_SKUID: originating socket UID (fsuid) + * @NFT_META_SKGID: originating socket GID (fsgid) + * @NFT_META_NFTRACE: packet nftrace bit + * @NFT_META_RTCLASSID: realm value of packet's route (skb->dst->tclassid) + * @NFT_META_SECMARK: packet secmark (skb->secmark) + */ +enum nft_meta_keys { + NFT_META_LEN, + NFT_META_PROTOCOL, + NFT_META_PRIORITY, + NFT_META_MARK, + NFT_META_IIF, + NFT_META_OIF, + NFT_META_IIFNAME, + NFT_META_OIFNAME, + NFT_META_IIFTYPE, + NFT_META_OIFTYPE, + NFT_META_SKUID, + NFT_META_SKGID, + NFT_META_NFTRACE, + NFT_META_RTCLASSID, + NFT_META_SECMARK, +}; + +/** + * enum nft_meta_attributes - nf_tables meta expression netlink attributes + * + * @NFTA_META_DREG: destination register (NLA_U32) + * @NFTA_META_KEY: meta data item to load (NLA_U32: nft_meta_keys) + */ +enum nft_meta_attributes { + NFTA_META_UNSPEC, + NFTA_META_DREG, + NFTA_META_KEY, + __NFTA_META_MAX +}; +#define NFTA_META_MAX (__NFTA_META_MAX - 1) + +/** + * enum nft_ct_keys - nf_tables ct expression keys + * + * @NFT_CT_STATE: conntrack state (bitmask of enum ip_conntrack_info) + * @NFT_CT_DIRECTION: conntrack direction (enum ip_conntrack_dir) + * @NFT_CT_STATUS: conntrack status (bitmask of enum ip_conntrack_status) + * @NFT_CT_MARK: conntrack mark value + * @NFT_CT_SECMARK: conntrack secmark value + * @NFT_CT_EXPIRATION: relative conntrack expiration time in ms + * @NFT_CT_HELPER: connection tracking helper assigned to conntrack + * @NFT_CT_L3PROTOCOL: conntrack layer 3 protocol + * @NFT_CT_SRC: conntrack layer 3 protocol source (IPv4/IPv6 address) + * @NFT_CT_DST: conntrack layer 3 protocol destination (IPv4/IPv6 address) + * @NFT_CT_PROTOCOL: conntrack layer 4 protocol + * @NFT_CT_PROTO_SRC: conntrack layer 4 protocol source + * @NFT_CT_PROTO_DST: conntrack layer 4 protocol destination + */ +enum nft_ct_keys { + NFT_CT_STATE, + NFT_CT_DIRECTION, + NFT_CT_STATUS, + NFT_CT_MARK, + NFT_CT_SECMARK, + NFT_CT_EXPIRATION, + NFT_CT_HELPER, + NFT_CT_L3PROTOCOL, + NFT_CT_SRC, + NFT_CT_DST, + NFT_CT_PROTOCOL, + NFT_CT_PROTO_SRC, + NFT_CT_PROTO_DST, +}; + +/** + * enum nft_ct_attributes - nf_tables ct expression netlink attributes + * + * @NFTA_CT_DREG: destination register (NLA_U32) + * @NFTA_CT_KEY: conntrack data item to load (NLA_U32: nft_ct_keys) + * @NFTA_CT_DIRECTION: direction in case of directional keys (NLA_U8) + */ +enum nft_ct_attributes { + NFTA_CT_UNSPEC, + NFTA_CT_DREG, + NFTA_CT_KEY, + NFTA_CT_DIRECTION, + __NFTA_CT_MAX +}; +#define NFTA_CT_MAX (__NFTA_CT_MAX - 1) + +/** + * enum nft_limit_attributes - nf_tables limit expression netlink attributes + * + * @NFTA_LIMIT_RATE: refill rate (NLA_U64) + * @NFTA_LIMIT_UNIT: refill unit (NLA_U64) + */ +enum nft_limit_attributes { + NFTA_LIMIT_UNSPEC, + NFTA_LIMIT_RATE, + NFTA_LIMIT_UNIT, + __NFTA_LIMIT_MAX +}; +#define NFTA_LIMIT_MAX (__NFTA_LIMIT_MAX - 1) + +/** + * enum nft_counter_attributes - nf_tables counter expression netlink attributes + * + * @NFTA_COUNTER_BYTES: number of bytes (NLA_U64) + * @NFTA_COUNTER_PACKETS: number of packets (NLA_U64) + */ +enum nft_counter_attributes { + NFTA_COUNTER_UNSPEC, + NFTA_COUNTER_BYTES, + NFTA_COUNTER_PACKETS, + __NFTA_COUNTER_MAX +}; +#define NFTA_COUNTER_MAX (__NFTA_COUNTER_MAX - 1) + +/** + * enum nft_log_attributes - nf_tables log expression netlink attributes + * + * @NFTA_LOG_GROUP: netlink group to send messages to (NLA_U32) + * @NFTA_LOG_PREFIX: prefix to prepend to log messages (NLA_STRING) + * @NFTA_LOG_SNAPLEN: length of payload to include in netlink message (NLA_U32) + * @NFTA_LOG_QTHRESHOLD: queue threshold (NLA_U32) + */ +enum nft_log_attributes { + NFTA_LOG_UNSPEC, + NFTA_LOG_GROUP, + NFTA_LOG_PREFIX, + NFTA_LOG_SNAPLEN, + NFTA_LOG_QTHRESHOLD, + __NFTA_LOG_MAX +}; +#define NFTA_LOG_MAX (__NFTA_LOG_MAX - 1) + +/** + * enum nft_reject_types - nf_tables reject expression reject types + * + * @NFT_REJECT_ICMP_UNREACH: reject using ICMP unreachable + * @NFT_REJECT_TCP_RST: reject using TCP RST + */ +enum nft_reject_types { + NFT_REJECT_ICMP_UNREACH, + NFT_REJECT_TCP_RST, +}; + +/** + * enum nft_reject_attributes - nf_tables reject expression netlink attributes + * + * @NFTA_REJECT_TYPE: packet type to use (NLA_U32: nft_reject_types) + * @NFTA_REJECT_ICMP_CODE: ICMP code to use (NLA_U8) + */ +enum nft_reject_attributes { + NFTA_REJECT_UNSPEC, + NFTA_REJECT_TYPE, + NFTA_REJECT_ICMP_CODE, + __NFTA_REJECT_MAX +}; +#define NFTA_REJECT_MAX (__NFTA_REJECT_MAX - 1) + +/** + * enum nft_nat_types - nf_tables nat expression NAT types + * + * @NFT_NAT_SNAT: source NAT + * @NFT_NAT_DNAT: destination NAT + */ +enum nft_nat_types { + NFT_NAT_SNAT, + NFT_NAT_DNAT, +}; + +/** + * enum nft_nat_attributes - nf_tables nat expression netlink attributes + * + * @NFTA_NAT_TYPE: NAT type (NLA_U32: nft_nat_types) + * @NFTA_NAT_ADDR_MIN: source register of address range start (NLA_U32: nft_registers) + * @NFTA_NAT_ADDR_MAX: source register of address range end (NLA_U32: nft_registers) + * @NFTA_NAT_PROTO_MIN: source register of proto range start (NLA_U32: nft_registers) + * @NFTA_NAT_PROTO_MAX: source register of proto range end (NLA_U32: nft_registers) + */ +enum nft_nat_attributes { + NFTA_NAT_UNSPEC, + NFTA_NAT_TYPE, + NFTA_NAT_ADDR_MIN, + NFTA_NAT_ADDR_MAX, + NFTA_NAT_PROTO_MIN, + NFTA_NAT_PROTO_MAX, + __NFTA_NAT_MAX +}; +#define NFTA_NAT_MAX (__NFTA_NAT_MAX - 1) + +#endif /* _LINUX_NF_TABLES_H */ diff --git a/include/uapi/linux/netfilter/nfnetlink.h b/include/uapi/linux/netfilter/nfnetlink.h index 4a4efafad5f4..d276c3bd55b8 100644 --- a/include/uapi/linux/netfilter/nfnetlink.h +++ b/include/uapi/linux/netfilter/nfnetlink.h @@ -18,6 +18,8 @@ enum nfnetlink_groups { #define NFNLGRP_CONNTRACK_EXP_UPDATE NFNLGRP_CONNTRACK_EXP_UPDATE NFNLGRP_CONNTRACK_EXP_DESTROY, #define NFNLGRP_CONNTRACK_EXP_DESTROY NFNLGRP_CONNTRACK_EXP_DESTROY + NFNLGRP_NFTABLES, +#define NFNLGRP_NFTABLES NFNLGRP_NFTABLES __NFNLGRP_MAX, }; #define NFNLGRP_MAX (__NFNLGRP_MAX - 1) @@ -51,6 +53,7 @@ struct nfgenmsg { #define NFNL_SUBSYS_ACCT 7 #define NFNL_SUBSYS_CTNETLINK_TIMEOUT 8 #define NFNL_SUBSYS_CTHELPER 9 -#define NFNL_SUBSYS_COUNT 10 +#define NFNL_SUBSYS_NFTABLES 10 +#define NFNL_SUBSYS_COUNT 11 #endif /* _UAPI_NFNETLINK_H */ diff --git a/net/bridge/netfilter/Kconfig b/net/bridge/netfilter/Kconfig index a9aff9c7d027..68f8128147be 100644 --- a/net/bridge/netfilter/Kconfig +++ b/net/bridge/netfilter/Kconfig @@ -1,6 +1,9 @@ # # Bridge netfilter configuration # +# +config NF_TABLES_BRIDGE + tristate "Ethernet Bridge nf_tables support" menuconfig BRIDGE_NF_EBTABLES tristate "Ethernet Bridge tables (ebtables) support" diff --git a/net/bridge/netfilter/Makefile b/net/bridge/netfilter/Makefile index 0718699540b0..ea7629f58b3d 100644 --- a/net/bridge/netfilter/Makefile +++ b/net/bridge/netfilter/Makefile @@ -2,6 +2,8 @@ # Makefile for the netfilter modules for Link Layer filtering on a bridge. # +obj-$(CONFIG_NF_TABLES_BRIDGE) += nf_tables_bridge.o + obj-$(CONFIG_BRIDGE_NF_EBTABLES) += ebtables.o # tables diff --git a/net/bridge/netfilter/nf_tables_bridge.c b/net/bridge/netfilter/nf_tables_bridge.c new file mode 100644 index 000000000000..bc5c21c911c0 --- /dev/null +++ b/net/bridge/netfilter/nf_tables_bridge.c @@ -0,0 +1,37 @@ +/* + * Copyright (c) 2008 Patrick McHardy <kaber@trash.net> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * Development of this code funded by Astaro AG (http://www.astaro.com/) + */ + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/netfilter_bridge.h> +#include <net/netfilter/nf_tables.h> + +static struct nft_af_info nft_af_bridge __read_mostly = { + .family = NFPROTO_BRIDGE, + .nhooks = NF_BR_NUMHOOKS, + .owner = THIS_MODULE, +}; + +static int __init nf_tables_bridge_init(void) +{ + return nft_register_afinfo(&nft_af_bridge); +} + +static void __exit nf_tables_bridge_exit(void) +{ + nft_unregister_afinfo(&nft_af_bridge); +} + +module_init(nf_tables_bridge_init); +module_exit(nf_tables_bridge_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); +MODULE_ALIAS_NFT_FAMILY(AF_BRIDGE); diff --git a/net/ipv4/netfilter/Kconfig b/net/ipv4/netfilter/Kconfig index 1657e39b291f..eb1d56ece361 100644 --- a/net/ipv4/netfilter/Kconfig +++ b/net/ipv4/netfilter/Kconfig @@ -36,6 +36,22 @@ config NF_CONNTRACK_PROC_COMPAT If unsure, say Y. +config NF_TABLES_IPV4 + depends on NF_TABLES + tristate "IPv4 nf_tables support" + +config NFT_REJECT_IPV4 + depends on NF_TABLES_IPV4 + tristate "nf_tables IPv4 reject support" + +config NF_TABLE_ROUTE_IPV4 + depends on NF_TABLES_IPV4 + tristate "IPv4 nf_tables route table support" + +config NF_TABLE_NAT_IPV4 + depends on NF_TABLES_IPV4 + tristate "IPv4 nf_tables nat table support" + config IP_NF_IPTABLES tristate "IP tables support (required for filtering/masq/NAT)" default m if NETFILTER_ADVANCED=n diff --git a/net/ipv4/netfilter/Makefile b/net/ipv4/netfilter/Makefile index 3622b248b6dd..b2f01cd2cd65 100644 --- a/net/ipv4/netfilter/Makefile +++ b/net/ipv4/netfilter/Makefile @@ -27,6 +27,11 @@ obj-$(CONFIG_NF_NAT_SNMP_BASIC) += nf_nat_snmp_basic.o # NAT protocols (nf_nat) obj-$(CONFIG_NF_NAT_PROTO_GRE) += nf_nat_proto_gre.o +obj-$(CONFIG_NF_TABLES_IPV4) += nf_tables_ipv4.o +obj-$(CONFIG_NFT_REJECT_IPV4) += nft_reject_ipv4.o +obj-$(CONFIG_NF_TABLE_ROUTE_IPV4) += nf_table_route_ipv4.o +obj-$(CONFIG_NF_TABLE_NAT_IPV4) += nf_table_nat_ipv4.o + # generic IP tables obj-$(CONFIG_IP_NF_IPTABLES) += ip_tables.o diff --git a/net/ipv4/netfilter/nf_table_nat_ipv4.c b/net/ipv4/netfilter/nf_table_nat_ipv4.c new file mode 100644 index 000000000000..2a6f184c10bd --- /dev/null +++ b/net/ipv4/netfilter/nf_table_nat_ipv4.c @@ -0,0 +1,409 @@ +/* + * Copyright (c) 2008 Patrick McHardy <kaber@trash.net> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * Development of this code funded by Astaro AG (http://www.astaro.com/) + */ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/list.h> +#include <linux/skbuff.h> +#include <linux/ip.h> +#include <linux/netlink.h> +#include <linux/netfilter.h> +#include <linux/netfilter_ipv4.h> +#include <linux/netfilter/nfnetlink.h> +#include <linux/netfilter/nf_tables.h> +#include <net/netfilter/nf_conntrack.h> +#include <net/netfilter/nf_nat.h> +#include <net/netfilter/nf_nat_core.h> +#include <net/netfilter/nf_tables.h> +#include <net/netfilter/nf_nat_l3proto.h> +#include <net/ip.h> + +struct nft_nat { + enum nft_registers sreg_addr_min:8; + enum nft_registers sreg_addr_max:8; + enum nft_registers sreg_proto_min:8; + enum nft_registers sreg_proto_max:8; + enum nf_nat_manip_type type; +}; + +static void nft_nat_eval(const struct nft_expr *expr, + struct nft_data data[NFT_REG_MAX + 1], + const struct nft_pktinfo *pkt) +{ + const struct nft_nat *priv = nft_expr_priv(expr); + enum ip_conntrack_info ctinfo; + struct nf_conn *ct = nf_ct_get(pkt->skb, &ctinfo); + struct nf_nat_range range; + + memset(&range, 0, sizeof(range)); + if (priv->sreg_addr_min) { + range.min_addr.ip = data[priv->sreg_addr_min].data[0]; + range.max_addr.ip = data[priv->sreg_addr_max].data[0]; + range.flags |= NF_NAT_RANGE_MAP_IPS; + } + + if (priv->sreg_proto_min) { + range.min_proto.all = data[priv->sreg_proto_min].data[0]; + range.max_proto.all = data[priv->sreg_proto_max].data[0]; + range.flags |= NF_NAT_RANGE_PROTO_SPECIFIED; + } + + data[NFT_REG_VERDICT].verdict = + nf_nat_setup_info(ct, &range, priv->type); +} + +static const struct nla_policy nft_nat_policy[NFTA_NAT_MAX + 1] = { + [NFTA_NAT_ADDR_MIN] = { .type = NLA_U32 }, + [NFTA_NAT_ADDR_MAX] = { .type = NLA_U32 }, + [NFTA_NAT_PROTO_MIN] = { .type = NLA_U32 }, + [NFTA_NAT_PROTO_MAX] = { .type = NLA_U32 }, + [NFTA_NAT_TYPE] = { .type = NLA_U32 }, +}; + +static int nft_nat_init(const struct nft_ctx *ctx, const struct nft_expr *expr, + const struct nlattr * const tb[]) +{ + struct nft_nat *priv = nft_expr_priv(expr); + int err; + + if (tb[NFTA_NAT_TYPE] == NULL) + return -EINVAL; + + switch (ntohl(nla_get_be32(tb[NFTA_NAT_TYPE]))) { + case NFT_NAT_SNAT: + priv->type = NF_NAT_MANIP_SRC; + break; + case NFT_NAT_DNAT: + priv->type = NF_NAT_MANIP_DST; + break; + default: + return -EINVAL; + } + + if (tb[NFTA_NAT_ADDR_MIN]) { + priv->sreg_addr_min = ntohl(nla_get_be32(tb[NFTA_NAT_ADDR_MIN])); + err = nft_validate_input_register(priv->sreg_addr_min); + if (err < 0) + return err; + } + + if (tb[NFTA_NAT_ADDR_MAX]) { + priv->sreg_addr_max = ntohl(nla_get_be32(tb[NFTA_NAT_ADDR_MAX])); + err = nft_validate_input_register(priv->sreg_addr_max); + if (err < 0) + return err; + } else + priv->sreg_addr_max = priv->sreg_addr_min; + + if (tb[NFTA_NAT_PROTO_MIN]) { + priv->sreg_proto_min = ntohl(nla_get_be32(tb[NFTA_NAT_PROTO_MIN])); + err = nft_validate_input_register(priv->sreg_proto_min); + if (err < 0) + return err; + } + + if (tb[NFTA_NAT_PROTO_MAX]) { + priv->sreg_proto_max = ntohl(nla_get_be32(tb[NFTA_NAT_PROTO_MAX])); + err = nft_validate_input_register(priv->sreg_proto_max); + if (err < 0) + return err; + } else + priv->sreg_proto_max = priv->sreg_proto_min; + + return 0; +} + +static int nft_nat_dump(struct sk_buff *skb, const struct nft_expr *expr) +{ + const struct nft_nat *priv = nft_expr_priv(expr); + + switch (priv->type) { + case NF_NAT_MANIP_SRC: + if (nla_put_be32(skb, NFTA_NAT_TYPE, htonl(NFT_NAT_SNAT))) + goto nla_put_failure; + break; + case NF_NAT_MANIP_DST: + if (nla_put_be32(skb, NFTA_NAT_TYPE, htonl(NFT_NAT_DNAT))) + goto nla_put_failure; + break; + } + + if (nla_put_be32(skb, NFTA_NAT_ADDR_MIN, htonl(priv->sreg_addr_min))) + goto nla_put_failure; + if (nla_put_be32(skb, NFTA_NAT_ADDR_MAX, htonl(priv->sreg_addr_max))) + goto nla_put_failure; + if (nla_put_be32(skb, NFTA_NAT_PROTO_MIN, htonl(priv->sreg_proto_min))) + goto nla_put_failure; + if (nla_put_be32(skb, NFTA_NAT_PROTO_MAX, htonl(priv->sreg_proto_max))) + goto nla_put_failure; + return 0; + +nla_put_failure: + return -1; +} + +static struct nft_expr_ops nft_nat_ops __read_mostly = { + .name = "nat", + .size = NFT_EXPR_SIZE(sizeof(struct nft_nat)), + .owner = THIS_MODULE, + .eval = nft_nat_eval, + .init = nft_nat_init, + .dump = nft_nat_dump, + .policy = nft_nat_policy, + .maxattr = NFTA_NAT_MAX, +}; + +/* + * NAT table + */ + +static unsigned int nf_nat_fn(const struct nf_hook_ops *ops, + struct sk_buff *skb, + const struct net_device *in, + const struct net_device *out, + int (*okfn)(struct sk_buff *)) +{ + enum ip_conntrack_info ctinfo; + struct nf_conn *ct = nf_ct_get(skb, &ctinfo); + struct nf_conn_nat *nat; + enum nf_nat_manip_type maniptype = HOOK2MANIP(ops->hooknum); + unsigned int ret; + + if (ct == NULL || nf_ct_is_untracked(ct)) + return NF_ACCEPT; + + NF_CT_ASSERT(!(ip_hdr(skb)->frag_off & htons(IP_MF | IP_OFFSET))); + + nat = nfct_nat(ct); + if (nat == NULL) { + /* Conntrack module was loaded late, can't add extension. */ + if (nf_ct_is_confirmed(ct)) + return NF_ACCEPT; + nat = nf_ct_ext_add(ct, NF_CT_EXT_NAT, GFP_ATOMIC); + if (nat == NULL) + return NF_ACCEPT; + } + + switch (ctinfo) { + case IP_CT_RELATED: + case IP_CT_RELATED + IP_CT_IS_REPLY: + if (ip_hdr(skb)->protocol == IPPROTO_ICMP) { + if (!nf_nat_icmp_reply_translation(skb, ct, ctinfo, + ops->hooknum)) + return NF_DROP; + else + return NF_ACCEPT; + } + /* Fall through */ + case IP_CT_NEW: + if (nf_nat_initialized(ct, maniptype)) + break; + + ret = nft_do_chain(ops, skb, in, out, okfn); + if (ret != NF_ACCEPT) + return ret; + if (!nf_nat_initialized(ct, maniptype)) { + ret = nf_nat_alloc_null_binding(ct, ops->hooknum); + if (ret != NF_ACCEPT) + return ret; + } + default: + break; + } + + return nf_nat_packet(ct, ctinfo, ops->hooknum, skb); +} + +static unsigned int nf_nat_prerouting(const struct nf_hook_ops *ops, + struct sk_buff *skb, + const struct net_device *in, + const struct net_device *out, + int (*okfn)(struct sk_buff *)) +{ + __be32 daddr = ip_hdr(skb)->daddr; + unsigned int ret; + + ret = nf_nat_fn(ops, skb, in, out, okfn); + if (ret != NF_DROP && ret != NF_STOLEN && + ip_hdr(skb)->daddr != daddr) { + skb_dst_drop(skb); + } + return ret; +} + +static unsigned int nf_nat_postrouting(const struct nf_hook_ops *ops, + struct sk_buff *skb, + const struct net_device *in, + const struct net_device *out, + int (*okfn)(struct sk_buff *)) +{ + enum ip_conntrack_info ctinfo __maybe_unused; + const struct nf_conn *ct __maybe_unused; + unsigned int ret; + + ret = nf_nat_fn(ops, skb, in, out, okfn); +#ifdef CONFIG_XFRM + if (ret != NF_DROP && ret != NF_STOLEN && + (ct = nf_ct_get(skb, &ctinfo)) != NULL) { + enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo); + + if (ct->tuplehash[dir].tuple.src.u3.ip != + ct->tuplehash[!dir].tuple.dst.u3.ip || + ct->tuplehash[dir].tuple.src.u.all != + ct->tuplehash[!dir].tuple.dst.u.all) + return nf_xfrm_me_harder(skb, AF_INET) == 0 ? + ret : NF_DROP; + } +#endif + return ret; +} + +static unsigned int nf_nat_output(const struct nf_hook_ops *ops, + struct sk_buff *skb, + const struct net_device *in, + const struct net_device *out, + int (*okfn)(struct sk_buff *)) +{ + enum ip_conntrack_info ctinfo; + const struct nf_conn *ct; + unsigned int ret; + + ret = nf_nat_fn(ops, skb, in, out, okfn); + if (ret != NF_DROP && ret != NF_STOLEN && + (ct = nf_ct_get(skb, &ctinfo)) != NULL) { + enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo); + + if (ct->tuplehash[dir].tuple.dst.u3.ip != + ct->tuplehash[!dir].tuple.src.u3.ip) { + if (ip_route_me_harder(skb, RTN_UNSPEC)) + ret = NF_DROP; + } +#ifdef CONFIG_XFRM + else if (ct->tuplehash[dir].tuple.dst.u.all != + ct->tuplehash[!dir].tuple.src.u.all) + if (nf_xfrm_me_harder(skb, AF_INET)) + ret = NF_DROP; +#endif + } + return ret; +} + +static struct nft_base_chain nf_chain_nat_prerouting __read_mostly = { + .chain = { + .name = "PREROUTING", + .rules = LIST_HEAD_INIT(nf_chain_nat_prerouting.chain.rules), + .flags = NFT_BASE_CHAIN | NFT_CHAIN_BUILTIN, + }, + .ops = { + .hook = nf_nat_prerouting, + .owner = THIS_MODULE, + .pf = NFPROTO_IPV4, + .hooknum = NF_INET_PRE_ROUTING, + .priority = NF_IP_PRI_NAT_DST, + .priv = &nf_chain_nat_prerouting.chain, + }, +}; + +static struct nft_base_chain nf_chain_nat_postrouting __read_mostly = { + .chain = { + .name = "POSTROUTING", + .rules = LIST_HEAD_INIT(nf_chain_nat_postrouting.chain.rules), + .flags = NFT_BASE_CHAIN | NFT_CHAIN_BUILTIN, + }, + .ops = { + .hook = nf_nat_postrouting, + .owner = THIS_MODULE, + .pf = NFPROTO_IPV4, + .hooknum = NF_INET_POST_ROUTING, + .priority = NF_IP_PRI_NAT_SRC, + .priv = &nf_chain_nat_postrouting.chain, + }, +}; + +static struct nft_base_chain nf_chain_nat_output __read_mostly = { + .chain = { + .name = "OUTPUT", + .rules = LIST_HEAD_INIT(nf_chain_nat_output.chain.rules), + .flags = NFT_BASE_CHAIN | NFT_CHAIN_BUILTIN, + }, + .ops = { + .hook = nf_nat_output, + .owner = THIS_MODULE, + .pf = NFPROTO_IPV4, + .hooknum = NF_INET_LOCAL_OUT, + .priority = NF_IP_PRI_NAT_DST, + .priv = &nf_chain_nat_output.chain, + }, +}; + +static struct nft_base_chain nf_chain_nat_input __read_mostly = { + .chain = { + .name = "INPUT", + .rules = LIST_HEAD_INIT(nf_chain_nat_input.chain.rules), + .flags = NFT_BASE_CHAIN | NFT_CHAIN_BUILTIN, + }, + .ops = { + .hook = nf_nat_fn, + .owner = THIS_MODULE, + .pf = NFPROTO_IPV4, + .hooknum = NF_INET_LOCAL_IN, + .priority = NF_IP_PRI_NAT_SRC, + .priv = &nf_chain_nat_input.chain, + }, +}; + + +static struct nft_table nf_table_nat_ipv4 __read_mostly = { + .name = "nat", + .chains = LIST_HEAD_INIT(nf_table_nat_ipv4.chains), +}; + +static int __init nf_table_nat_init(void) +{ + int err; + + list_add_tail(&nf_chain_nat_prerouting.chain.list, + &nf_table_nat_ipv4.chains); + list_add_tail(&nf_chain_nat_postrouting.chain.list, + &nf_table_nat_ipv4.chains); + list_add_tail(&nf_chain_nat_output.chain.list, + &nf_table_nat_ipv4.chains); + list_add_tail(&nf_chain_nat_input.chain.list, + &nf_table_nat_ipv4.chains); + + err = nft_register_table(&nf_table_nat_ipv4, NFPROTO_IPV4); + if (err < 0) + goto err1; + + err = nft_register_expr(&nft_nat_ops); + if (err < 0) + goto err2; + + return 0; + +err2: + nft_unregister_table(&nf_table_nat_ipv4, NFPROTO_IPV4); +err1: + return err; +} + +static void __exit nf_table_nat_exit(void) +{ + nft_unregister_expr(&nft_nat_ops); + nft_unregister_table(&nf_table_nat_ipv4, AF_INET); +} + +module_init(nf_table_nat_init); +module_exit(nf_table_nat_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); +MODULE_ALIAS_NFT_TABLE(AF_INET, "nat"); +MODULE_ALIAS_NFT_EXPR("nat"); diff --git a/net/ipv4/netfilter/nf_table_route_ipv4.c b/net/ipv4/netfilter/nf_table_route_ipv4.c new file mode 100644 index 000000000000..4f257a1ed661 --- /dev/null +++ b/net/ipv4/netfilter/nf_table_route_ipv4.c @@ -0,0 +1,97 @@ +/* + * Copyright (c) 2008 Patrick McHardy <kaber@trash.net> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/list.h> +#include <linux/skbuff.h> +#include <linux/netlink.h> +#include <linux/netfilter.h> +#include <linux/netfilter_ipv4.h> +#include <linux/netfilter/nfnetlink.h> +#include <linux/netfilter/nf_tables.h> +#include <net/netfilter/nf_tables.h> +#include <net/route.h> +#include <net/ip.h> + +static unsigned int nf_route_table_hook(const struct nf_hook_ops *ops, + struct sk_buff *skb, + const struct net_device *in, + const struct net_device *out, + int (*okfn)(struct sk_buff *)) +{ + unsigned int ret; + u32 mark; + __be32 saddr, daddr; + u_int8_t tos; + const struct iphdr *iph; + + /* root is playing with raw sockets. */ + if (skb->len < sizeof(struct iphdr) || + ip_hdrlen(skb) < sizeof(struct iphdr)) + return NF_ACCEPT; + + mark = skb->mark; + iph = ip_hdr(skb); + saddr = iph->saddr; + daddr = iph->daddr; + tos = iph->tos; + + ret = nft_do_chain(ops, skb, in, out, okfn); + if (ret != NF_DROP && ret != NF_QUEUE) { + iph = ip_hdr(skb); + + if (iph->saddr != saddr || + iph->daddr != daddr || + skb->mark != mark || + iph->tos != tos) + if (ip_route_me_harder(skb, RTN_UNSPEC)) + ret = NF_DROP; + } + return ret; +} + +static struct nft_base_chain nf_chain_route_output __read_mostly = { + .chain = { + .name = "OUTPUT", + .rules = LIST_HEAD_INIT(nf_chain_route_output.chain.rules), + .flags = NFT_BASE_CHAIN | NFT_CHAIN_BUILTIN, + }, + .ops = { + .hook = nf_route_table_hook, + .owner = THIS_MODULE, + .pf = NFPROTO_IPV4, + .hooknum = NF_INET_LOCAL_OUT, + .priority = NF_IP_PRI_MANGLE, + .priv = &nf_chain_route_output.chain, + }, +}; + +static struct nft_table nf_table_route_ipv4 __read_mostly = { + .name = "route", + .chains = LIST_HEAD_INIT(nf_table_route_ipv4.chains), +}; + +static int __init nf_table_route_init(void) +{ + list_add_tail(&nf_chain_route_output.chain.list, + &nf_table_route_ipv4.chains); + return nft_register_table(&nf_table_route_ipv4, NFPROTO_IPV4); +} + +static void __exit nf_table_route_exit(void) +{ + nft_unregister_table(&nf_table_route_ipv4, NFPROTO_IPV4); +} + +module_init(nf_table_route_init); +module_exit(nf_table_route_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); +MODULE_ALIAS_NFT_TABLE(AF_INET, "route"); diff --git a/net/ipv4/netfilter/nf_tables_ipv4.c b/net/ipv4/netfilter/nf_tables_ipv4.c new file mode 100644 index 000000000000..63d0a3bf53d3 --- /dev/null +++ b/net/ipv4/netfilter/nf_tables_ipv4.c @@ -0,0 +1,59 @@ +/* + * Copyright (c) 2008 Patrick McHardy <kaber@trash.net> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * Development of this code funded by Astaro AG (http://www.astaro.com/) + */ + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/ip.h> +#include <linux/netfilter_ipv4.h> +#include <net/netfilter/nf_tables.h> +#include <net/ip.h> + +static unsigned int nft_ipv4_output(const struct nf_hook_ops *ops, + struct sk_buff *skb, + const struct net_device *in, + const struct net_device *out, + int (*okfn)(struct sk_buff *)) +{ + if (unlikely(skb->len < sizeof(struct iphdr) || + ip_hdr(skb)->ihl < sizeof(struct iphdr) / 4)) { + if (net_ratelimit()) + pr_info("nf_tables_ipv4: ignoring short SOCK_RAW " + "packet\n"); + return NF_ACCEPT; + } + + return nft_do_chain(ops, skb, in, out, okfn); +} + +static struct nft_af_info nft_af_ipv4 __read_mostly = { + .family = NFPROTO_IPV4, + .nhooks = NF_INET_NUMHOOKS, + .owner = THIS_MODULE, + .hooks = { + [NF_INET_LOCAL_OUT] = nft_ipv4_output, + }, +}; + +static int __init nf_tables_ipv4_init(void) +{ + return nft_register_afinfo(&nft_af_ipv4); +} + +static void __exit nf_tables_ipv4_exit(void) +{ + nft_unregister_afinfo(&nft_af_ipv4); +} + +module_init(nf_tables_ipv4_init); +module_exit(nf_tables_ipv4_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); +MODULE_ALIAS_NFT_FAMILY(AF_INET); diff --git a/net/ipv4/netfilter/nft_reject_ipv4.c b/net/ipv4/netfilter/nft_reject_ipv4.c new file mode 100644 index 000000000000..b4ee8d3bb1e4 --- /dev/null +++ b/net/ipv4/netfilter/nft_reject_ipv4.c @@ -0,0 +1,117 @@ +/* + * Copyright (c) 2008 Patrick McHardy <kaber@trash.net> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * Development of this code funded by Astaro AG (http://www.astaro.com/) + */ + +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/module.h> +#include <linux/netlink.h> +#include <linux/netfilter.h> +#include <linux/netfilter/nf_tables.h> +#include <net/netfilter/nf_tables.h> +#include <net/icmp.h> + +struct nft_reject { + enum nft_reject_types type:8; + u8 icmp_code; +}; + +static void nft_reject_eval(const struct nft_expr *expr, + struct nft_data data[NFT_REG_MAX + 1], + const struct nft_pktinfo *pkt) +{ + struct nft_reject *priv = nft_expr_priv(expr); + + switch (priv->type) { + case NFT_REJECT_ICMP_UNREACH: + icmp_send(pkt->skb, ICMP_DEST_UNREACH, priv->icmp_code, 0); + break; + case NFT_REJECT_TCP_RST: + break; + } + + data[NFT_REG_VERDICT].verdict = NF_DROP; +} + +static const struct nla_policy nft_reject_policy[NFTA_REJECT_MAX + 1] = { + [NFTA_REJECT_TYPE] = { .type = NLA_U32 }, + [NFTA_REJECT_ICMP_CODE] = { .type = NLA_U8 }, +}; + +static int nft_reject_init(const struct nft_ctx *ctx, + const struct nft_expr *expr, + const struct nlattr * const tb[]) +{ + struct nft_reject *priv = nft_expr_priv(expr); + + if (tb[NFTA_REJECT_TYPE] == NULL) + return -EINVAL; + + priv->type = ntohl(nla_get_be32(tb[NFTA_REJECT_TYPE])); + switch (priv->type) { + case NFT_REJECT_ICMP_UNREACH: + if (tb[NFTA_REJECT_ICMP_CODE] == NULL) + return -EINVAL; + priv->icmp_code = nla_get_u8(tb[NFTA_REJECT_ICMP_CODE]); + case NFT_REJECT_TCP_RST: + break; + default: + return -EINVAL; + } + + return 0; +} + +static int nft_reject_dump(struct sk_buff *skb, const struct nft_expr *expr) +{ + const struct nft_reject *priv = nft_expr_priv(expr); + + if (nla_put_be32(skb, NFTA_REJECT_TYPE, priv->type)) + goto nla_put_failure; + + switch (priv->type) { + case NFT_REJECT_ICMP_UNREACH: + if (nla_put_u8(skb, NFTA_REJECT_ICMP_CODE, priv->icmp_code)) + goto nla_put_failure; + break; + } + + return 0; + +nla_put_failure: + return -1; +} + +static struct nft_expr_ops reject_ops __read_mostly = { + .name = "reject", + .size = NFT_EXPR_SIZE(sizeof(struct nft_reject)), + .owner = THIS_MODULE, + .eval = nft_reject_eval, + .init = nft_reject_init, + .dump = nft_reject_dump, + .policy = nft_reject_policy, + .maxattr = NFTA_REJECT_MAX, +}; + +static int __init nft_reject_module_init(void) +{ + return nft_register_expr(&reject_ops); +} + +static void __exit nft_reject_module_exit(void) +{ + nft_unregister_expr(&reject_ops); +} + +module_init(nft_reject_module_init); +module_exit(nft_reject_module_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); +MODULE_ALIAS_NFT_EXPR("reject"); diff --git a/net/ipv6/netfilter/Kconfig b/net/ipv6/netfilter/Kconfig index a7f842b29b67..5677e38eeca3 100644 --- a/net/ipv6/netfilter/Kconfig +++ b/net/ipv6/netfilter/Kconfig @@ -25,6 +25,14 @@ config NF_CONNTRACK_IPV6 To compile it as a module, choose M here. If unsure, say N. +config NF_TABLES_IPV6 + depends on NF_TABLES + tristate "IPv6 nf_tables support" + +config NF_TABLE_ROUTE_IPV6 + depends on NF_TABLES_IPV6 + tristate "IPv6 nf_tables route table support" + config IP6_NF_IPTABLES tristate "IP6 tables support (required for filtering)" depends on INET && IPV6 diff --git a/net/ipv6/netfilter/Makefile b/net/ipv6/netfilter/Makefile index 2b53738f798c..956af4492d10 100644 --- a/net/ipv6/netfilter/Makefile +++ b/net/ipv6/netfilter/Makefile @@ -23,6 +23,10 @@ obj-$(CONFIG_NF_NAT_IPV6) += nf_nat_ipv6.o nf_defrag_ipv6-y := nf_defrag_ipv6_hooks.o nf_conntrack_reasm.o obj-$(CONFIG_NF_DEFRAG_IPV6) += nf_defrag_ipv6.o +# nf_tables +obj-$(CONFIG_NF_TABLES_IPV6) += nf_tables_ipv6.o +obj-$(CONFIG_NF_TABLE_ROUTE_IPV6) += nf_table_route_ipv6.o + # matches obj-$(CONFIG_IP6_NF_MATCH_AH) += ip6t_ah.o obj-$(CONFIG_IP6_NF_MATCH_EUI64) += ip6t_eui64.o diff --git a/net/ipv6/netfilter/nf_table_route_ipv6.c b/net/ipv6/netfilter/nf_table_route_ipv6.c new file mode 100644 index 000000000000..48ac65c7b398 --- /dev/null +++ b/net/ipv6/netfilter/nf_table_route_ipv6.c @@ -0,0 +1,93 @@ +/* + * Copyright (c) 2008 Patrick McHardy <kaber@trash.net> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * Development of this code funded by Astaro AG (http://www.astaro.com/) + */ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/list.h> +#include <linux/skbuff.h> +#include <linux/netlink.h> +#include <linux/netfilter.h> +#include <linux/netfilter_ipv6.h> +#include <linux/netfilter/nfnetlink.h> +#include <linux/netfilter/nf_tables.h> +#include <net/netfilter/nf_tables.h> +#include <net/route.h> + +static unsigned int nf_route_table_hook(const struct nf_hook_ops *ops, + struct sk_buff *skb, + const struct net_device *in, + const struct net_device *out, + int (*okfn)(struct sk_buff *)) +{ + unsigned int ret; + struct in6_addr saddr, daddr; + u_int8_t hop_limit; + u32 mark, flowlabel; + + /* save source/dest address, mark, hoplimit, flowlabel, priority */ + memcpy(&saddr, &ipv6_hdr(skb)->saddr, sizeof(saddr)); + memcpy(&daddr, &ipv6_hdr(skb)->daddr, sizeof(daddr)); + mark = skb->mark; + hop_limit = ipv6_hdr(skb)->hop_limit; + + /* flowlabel and prio (includes version, which shouldn't change either */ + flowlabel = *((u32 *)ipv6_hdr(skb)); + + ret = nft_do_chain(ops, skb, in, out, okfn); + if (ret != NF_DROP && ret != NF_QUEUE && + (memcmp(&ipv6_hdr(skb)->saddr, &saddr, sizeof(saddr)) || + memcmp(&ipv6_hdr(skb)->daddr, &daddr, sizeof(daddr)) || + skb->mark != mark || + ipv6_hdr(skb)->hop_limit != hop_limit || + flowlabel != *((u_int32_t *)ipv6_hdr(skb)))) + return ip6_route_me_harder(skb) == 0 ? ret : NF_DROP; + + return ret; +} + +static struct nft_base_chain nf_chain_route_output __read_mostly = { + .chain = { + .name = "OUTPUT", + .rules = LIST_HEAD_INIT(nf_chain_route_output.chain.rules), + .flags = NFT_BASE_CHAIN | NFT_CHAIN_BUILTIN, + }, + .ops = { + .hook = nf_route_table_hook, + .owner = THIS_MODULE, + .pf = NFPROTO_IPV6, + .hooknum = NF_INET_LOCAL_OUT, + .priority = NF_IP6_PRI_MANGLE, + .priv = &nf_chain_route_output.chain, + }, +}; + +static struct nft_table nf_table_route_ipv6 __read_mostly = { + .name = "route", + .chains = LIST_HEAD_INIT(nf_table_route_ipv6.chains), +}; + +static int __init nf_table_route_init(void) +{ + list_add_tail(&nf_chain_route_output.chain.list, + &nf_table_route_ipv6.chains); + return nft_register_table(&nf_table_route_ipv6, NFPROTO_IPV6); +} + +static void __exit nf_table_route_exit(void) +{ + nft_unregister_table(&nf_table_route_ipv6, NFPROTO_IPV6); +} + +module_init(nf_table_route_init); +module_exit(nf_table_route_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); +MODULE_ALIAS_NFT_TABLE(AF_INET6, "route"); diff --git a/net/ipv6/netfilter/nf_tables_ipv6.c b/net/ipv6/netfilter/nf_tables_ipv6.c new file mode 100644 index 000000000000..e0717cea4913 --- /dev/null +++ b/net/ipv6/netfilter/nf_tables_ipv6.c @@ -0,0 +1,57 @@ +/* + * Copyright (c) 2008 Patrick McHardy <kaber@trash.net> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * Development of this code funded by Astaro AG (http://www.astaro.com/) + */ + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/ipv6.h> +#include <linux/netfilter_ipv6.h> +#include <net/netfilter/nf_tables.h> + +static unsigned int nft_ipv6_output(const struct nf_hook_ops *ops, + struct sk_buff *skb, + const struct net_device *in, + const struct net_device *out, + int (*okfn)(struct sk_buff *)) +{ + if (unlikely(skb->len < sizeof(struct ipv6hdr))) { + if (net_ratelimit()) + pr_info("nf_tables_ipv6: ignoring short SOCK_RAW " + "packet\n"); + return NF_ACCEPT; + } + + return nft_do_chain(ops, skb, in, out, okfn); +} + +static struct nft_af_info nft_af_ipv6 __read_mostly = { + .family = NFPROTO_IPV6, + .nhooks = NF_INET_NUMHOOKS, + .owner = THIS_MODULE, + .hooks = { + [NF_INET_LOCAL_OUT] = nft_ipv6_output, + }, +}; + +static int __init nf_tables_ipv6_init(void) +{ + return nft_register_afinfo(&nft_af_ipv6); +} + +static void __exit nf_tables_ipv6_exit(void) +{ + nft_unregister_afinfo(&nft_af_ipv6); +} + +module_init(nf_tables_ipv6_init); +module_exit(nf_tables_ipv6_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); +MODULE_ALIAS_NFT_FAMILY(AF_INET6); diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig index 6e839b6dff2b..c271e1af93b5 100644 --- a/net/netfilter/Kconfig +++ b/net/netfilter/Kconfig @@ -413,6 +413,43 @@ config NETFILTER_SYNPROXY endif # NF_CONNTRACK +config NF_TABLES + depends on NETFILTER_NETLINK + tristate "Netfilter nf_tables support" + +config NFT_EXTHDR + depends on NF_TABLES + tristate "Netfilter nf_tables IPv6 exthdr module" + +config NFT_META + depends on NF_TABLES + tristate "Netfilter nf_tables meta module" + +config NFT_CT + depends on NF_TABLES + depends on NF_CONNTRACK + tristate "Netfilter nf_tables conntrack module" + +config NFT_SET + depends on NF_TABLES + tristate "Netfilter nf_tables set module" + +config NFT_HASH + depends on NF_TABLES + tristate "Netfilter nf_tables hash module" + +config NFT_COUNTER + depends on NF_TABLES + tristate "Netfilter nf_tables counter module" + +config NFT_LOG + depends on NF_TABLES + tristate "Netfilter nf_tables log module" + +config NFT_LIMIT + depends on NF_TABLES + tristate "Netfilter nf_tables limit module" + config NETFILTER_XTABLES tristate "Netfilter Xtables support (required for ip_tables)" default m if NETFILTER_ADVANCED=n diff --git a/net/netfilter/Makefile b/net/netfilter/Makefile index c3a0a12907f6..1ca3f3932826 100644 --- a/net/netfilter/Makefile +++ b/net/netfilter/Makefile @@ -64,6 +64,22 @@ obj-$(CONFIG_NF_NAT_TFTP) += nf_nat_tftp.o # SYNPROXY obj-$(CONFIG_NETFILTER_SYNPROXY) += nf_synproxy_core.o +# nf_tables +nf_tables-objs += nf_tables_core.o nf_tables_api.o +nf_tables-objs += nft_immediate.o nft_cmp.o nft_lookup.o +nf_tables-objs += nft_bitwise.o nft_byteorder.o nft_payload.o + +obj-$(CONFIG_NF_TABLES) += nf_tables.o +obj-$(CONFIG_NFT_EXTHDR) += nft_exthdr.o +obj-$(CONFIG_NFT_META) += nft_meta.o +obj-$(CONFIG_NFT_CT) += nft_ct.o +obj-$(CONFIG_NFT_LIMIT) += nft_limit.o +#nf_tables-objs += nft_meta_target.o +obj-$(CONFIG_NFT_SET) += nft_set.o +obj-$(CONFIG_NFT_HASH) += nft_hash.o +obj-$(CONFIG_NFT_COUNTER) += nft_counter.o +obj-$(CONFIG_NFT_LOG) += nft_log.o + # generic X tables obj-$(CONFIG_NETFILTER_XTABLES) += x_tables.o xt_tcpudp.o diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c new file mode 100644 index 000000000000..7d59c89c6c75 --- /dev/null +++ b/net/netfilter/nf_tables_api.c @@ -0,0 +1,1760 @@ +/* + * Copyright (c) 2007, 2008 Patrick McHardy <kaber@trash.net> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * Development of this code funded by Astaro AG (http://www.astaro.com/) + */ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/list.h> +#include <linux/skbuff.h> +#include <linux/netlink.h> +#include <linux/netfilter.h> +#include <linux/netfilter/nfnetlink.h> +#include <linux/netfilter/nf_tables.h> +#include <net/netfilter/nf_tables_core.h> +#include <net/netfilter/nf_tables.h> +#include <net/sock.h> + +static LIST_HEAD(nf_tables_afinfo); +static LIST_HEAD(nf_tables_expressions); + +/** + * nft_register_afinfo - register nf_tables address family info + * + * @afi: address family info to register + * + * Register the address family for use with nf_tables. Returns zero on + * success or a negative errno code otherwise. + */ +int nft_register_afinfo(struct nft_af_info *afi) +{ + INIT_LIST_HEAD(&afi->tables); + nfnl_lock(NFNL_SUBSYS_NFTABLES); + list_add_tail(&afi->list, &nf_tables_afinfo); + nfnl_unlock(NFNL_SUBSYS_NFTABLES); + return 0; +} +EXPORT_SYMBOL_GPL(nft_register_afinfo); + +/** + * nft_unregister_afinfo - unregister nf_tables address family info + * + * @afi: address family info to unregister + * + * Unregister the address family for use with nf_tables. + */ +void nft_unregister_afinfo(struct nft_af_info *afi) +{ + nfnl_lock(NFNL_SUBSYS_NFTABLES); + list_del(&afi->list); + nfnl_unlock(NFNL_SUBSYS_NFTABLES); +} +EXPORT_SYMBOL_GPL(nft_unregister_afinfo); + +static struct nft_af_info *nft_afinfo_lookup(int family) +{ + struct nft_af_info *afi; + + list_for_each_entry(afi, &nf_tables_afinfo, list) { + if (afi->family == family) + return afi; + } + return NULL; +} + +static struct nft_af_info *nf_tables_afinfo_lookup(int family, bool autoload) +{ + struct nft_af_info *afi; + + afi = nft_afinfo_lookup(family); + if (afi != NULL) + return afi; +#ifdef CONFIG_MODULES + if (autoload) { + nfnl_unlock(NFNL_SUBSYS_NFTABLES); + request_module("nft-afinfo-%u", family); + nfnl_lock(NFNL_SUBSYS_NFTABLES); + afi = nft_afinfo_lookup(family); + if (afi != NULL) + return ERR_PTR(-EAGAIN); + } +#endif + return ERR_PTR(-EAFNOSUPPORT); +} + +/* + * Tables + */ + +static struct nft_table *nft_table_lookup(const struct nft_af_info *afi, + const struct nlattr *nla) +{ + struct nft_table *table; + + list_for_each_entry(table, &afi->tables, list) { + if (!nla_strcmp(nla, table->name)) + return table; + } + return NULL; +} + +static struct nft_table *nf_tables_table_lookup(const struct nft_af_info *afi, + const struct nlattr *nla, + bool autoload) +{ + struct nft_table *table; + + if (nla == NULL) + return ERR_PTR(-EINVAL); + + table = nft_table_lookup(afi, nla); + if (table != NULL) + return table; + +#ifdef CONFIG_MODULES + if (autoload) { + nfnl_unlock(NFNL_SUBSYS_NFTABLES); + request_module("nft-table-%u-%*.s", afi->family, + nla_len(nla)-1, (const char *)nla_data(nla)); + nfnl_lock(NFNL_SUBSYS_NFTABLES); + if (nft_table_lookup(afi, nla)) + return ERR_PTR(-EAGAIN); + } +#endif + return ERR_PTR(-ENOENT); +} + +static inline u64 nf_tables_alloc_handle(struct nft_table *table) +{ + return ++table->hgenerator; +} + +static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = { + [NFTA_TABLE_NAME] = { .type = NLA_STRING }, +}; + +static int nf_tables_fill_table_info(struct sk_buff *skb, u32 portid, u32 seq, + int event, u32 flags, int family, + const struct nft_table *table) +{ + struct nlmsghdr *nlh; + struct nfgenmsg *nfmsg; + + event |= NFNL_SUBSYS_NFTABLES << 8; + nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags); + if (nlh == NULL) + goto nla_put_failure; + + nfmsg = nlmsg_data(nlh); + nfmsg->nfgen_family = family; + nfmsg->version = NFNETLINK_V0; + nfmsg->res_id = 0; + + if (nla_put_string(skb, NFTA_TABLE_NAME, table->name)) + goto nla_put_failure; + + return nlmsg_end(skb, nlh); + +nla_put_failure: + nlmsg_trim(skb, nlh); + return -1; +} + +static int nf_tables_table_notify(const struct sk_buff *oskb, + const struct nlmsghdr *nlh, + const struct nft_table *table, + int event, int family) +{ + struct sk_buff *skb; + u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; + u32 seq = nlh ? nlh->nlmsg_seq : 0; + struct net *net = oskb ? sock_net(oskb->sk) : &init_net; + bool report; + int err; + + report = nlh ? nlmsg_report(nlh) : false; + if (!report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) + return 0; + + err = -ENOBUFS; + skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); + if (skb == NULL) + goto err; + + err = nf_tables_fill_table_info(skb, portid, seq, event, 0, + family, table); + if (err < 0) { + kfree_skb(skb); + goto err; + } + + err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, + GFP_KERNEL); +err: + if (err < 0) + nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err); + return err; +} + +static int nf_tables_dump_tables(struct sk_buff *skb, + struct netlink_callback *cb) +{ + const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); + const struct nft_af_info *afi; + const struct nft_table *table; + unsigned int idx = 0, s_idx = cb->args[0]; + int family = nfmsg->nfgen_family; + + list_for_each_entry(afi, &nf_tables_afinfo, list) { + if (family != NFPROTO_UNSPEC && family != afi->family) + continue; + + list_for_each_entry(table, &afi->tables, list) { + if (idx < s_idx) + goto cont; + if (idx > s_idx) + memset(&cb->args[1], 0, + sizeof(cb->args) - sizeof(cb->args[0])); + if (nf_tables_fill_table_info(skb, + NETLINK_CB(cb->skb).portid, + cb->nlh->nlmsg_seq, + NFT_MSG_NEWTABLE, + NLM_F_MULTI, + afi->family, table) < 0) + goto done; +cont: + idx++; + } + } +done: + cb->args[0] = idx; + return skb->len; +} + +static int nf_tables_gettable(struct sock *nlsk, struct sk_buff *skb, + const struct nlmsghdr *nlh, + const struct nlattr * const nla[]) +{ + const struct nfgenmsg *nfmsg = nlmsg_data(nlh); + const struct nft_af_info *afi; + const struct nft_table *table; + struct sk_buff *skb2; + int family = nfmsg->nfgen_family; + int err; + + if (nlh->nlmsg_flags & NLM_F_DUMP) { + struct netlink_dump_control c = { + .dump = nf_tables_dump_tables, + }; + return netlink_dump_start(nlsk, skb, nlh, &c); + } + + afi = nf_tables_afinfo_lookup(family, false); + if (IS_ERR(afi)) + return PTR_ERR(afi); + + table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME], false); + if (IS_ERR(table)) + return PTR_ERR(table); + + skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); + if (!skb2) + return -ENOMEM; + + err = nf_tables_fill_table_info(skb2, NETLINK_CB(skb).portid, + nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0, + family, table); + if (err < 0) + goto err; + + return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); + +err: + kfree_skb(skb2); + return err; +} + +static int nf_tables_newtable(struct sock *nlsk, struct sk_buff *skb, + const struct nlmsghdr *nlh, + const struct nlattr * const nla[]) +{ + const struct nfgenmsg *nfmsg = nlmsg_data(nlh); + const struct nlattr *name; + struct nft_af_info *afi; + struct nft_table *table; + int family = nfmsg->nfgen_family; + + afi = nf_tables_afinfo_lookup(family, true); + if (IS_ERR(afi)) + return PTR_ERR(afi); + + name = nla[NFTA_TABLE_NAME]; + table = nf_tables_table_lookup(afi, name, false); + if (IS_ERR(table)) { + if (PTR_ERR(table) != -ENOENT) + return PTR_ERR(table); + table = NULL; + } + + if (table != NULL) { + if (nlh->nlmsg_flags & NLM_F_EXCL) + return -EEXIST; + if (nlh->nlmsg_flags & NLM_F_REPLACE) + return -EOPNOTSUPP; + return 0; + } + + table = kzalloc(sizeof(*table) + nla_len(name), GFP_KERNEL); + if (table == NULL) + return -ENOMEM; + + nla_strlcpy(table->name, name, nla_len(name)); + INIT_LIST_HEAD(&table->chains); + + list_add_tail(&table->list, &afi->tables); + nf_tables_table_notify(skb, nlh, table, NFT_MSG_NEWTABLE, family); + return 0; +} + +static int nf_tables_deltable(struct sock *nlsk, struct sk_buff *skb, + const struct nlmsghdr *nlh, + const struct nlattr * const nla[]) +{ + const struct nfgenmsg *nfmsg = nlmsg_data(nlh); + struct nft_af_info *afi; + struct nft_table *table; + int family = nfmsg->nfgen_family; + + afi = nf_tables_afinfo_lookup(family, false); + if (IS_ERR(afi)) + return PTR_ERR(afi); + + table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME], false); + if (IS_ERR(table)) + return PTR_ERR(table); + + if (table->flags & NFT_TABLE_BUILTIN) + return -EOPNOTSUPP; + + if (table->use) + return -EBUSY; + + list_del(&table->list); + nf_tables_table_notify(skb, nlh, table, NFT_MSG_DELTABLE, family); + kfree(table); + return 0; +} + +static struct nft_table *__nf_tables_table_lookup(const struct nft_af_info *afi, + const char *name) +{ + struct nft_table *table; + + list_for_each_entry(table, &afi->tables, list) { + if (!strcmp(name, table->name)) + return table; + } + + return ERR_PTR(-ENOENT); +} + +static int nf_tables_chain_notify(const struct sk_buff *oskb, + const struct nlmsghdr *nlh, + const struct nft_table *table, + const struct nft_chain *chain, + int event, int family); + +/** + * nft_register_table - register a built-in table + * + * @table: the table to register + * @family: protocol family to register table with + * + * Register a built-in table for use with nf_tables. Returns zero on + * success or a negative errno code otherwise. + */ +int nft_register_table(struct nft_table *table, int family) +{ + struct nft_af_info *afi; + struct nft_table *t; + struct nft_chain *chain; + int err; + + nfnl_lock(NFNL_SUBSYS_NFTABLES); +again: + afi = nf_tables_afinfo_lookup(family, true); + if (IS_ERR(afi)) { + err = PTR_ERR(afi); + if (err == -EAGAIN) + goto again; + goto err; + } + + t = __nf_tables_table_lookup(afi, table->name); + if (IS_ERR(t)) { + err = PTR_ERR(t); + if (err != -ENOENT) + goto err; + t = NULL; + } + + if (t != NULL) { + err = -EEXIST; + goto err; + } + + table->flags |= NFT_TABLE_BUILTIN; + list_add_tail(&table->list, &afi->tables); + nf_tables_table_notify(NULL, NULL, table, NFT_MSG_NEWTABLE, family); + list_for_each_entry(chain, &table->chains, list) + nf_tables_chain_notify(NULL, NULL, table, chain, + NFT_MSG_NEWCHAIN, family); + err = 0; +err: + nfnl_unlock(NFNL_SUBSYS_NFTABLES); + return err; +} +EXPORT_SYMBOL_GPL(nft_register_table); + +/** + * nft_unregister_table - unregister a built-in table + * + * @table: the table to unregister + * @family: protocol family to unregister table with + * + * Unregister a built-in table for use with nf_tables. + */ +void nft_unregister_table(struct nft_table *table, int family) +{ + struct nft_chain *chain; + + nfnl_lock(NFNL_SUBSYS_NFTABLES); + list_del(&table->list); + list_for_each_entry(chain, &table->chains, list) + nf_tables_chain_notify(NULL, NULL, table, chain, + NFT_MSG_DELCHAIN, family); + nf_tables_table_notify(NULL, NULL, table, NFT_MSG_DELTABLE, family); + nfnl_unlock(NFNL_SUBSYS_NFTABLES); +} +EXPORT_SYMBOL_GPL(nft_unregister_table); + +/* + * Chains + */ + +static struct nft_chain * +nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle) +{ + struct nft_chain *chain; + + list_for_each_entry(chain, &table->chains, list) { + if (chain->handle == handle) + return chain; + } + + return ERR_PTR(-ENOENT); +} + +static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table, + const struct nlattr *nla) +{ + struct nft_chain *chain; + + if (nla == NULL) + return ERR_PTR(-EINVAL); + + list_for_each_entry(chain, &table->chains, list) { + if (!nla_strcmp(nla, chain->name)) + return chain; + } + + return ERR_PTR(-ENOENT); +} + +static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = { + [NFTA_CHAIN_TABLE] = { .type = NLA_STRING }, + [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 }, + [NFTA_CHAIN_NAME] = { .type = NLA_STRING, + .len = NFT_CHAIN_MAXNAMELEN - 1 }, + [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED }, +}; + +static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = { + [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 }, + [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 }, +}; + +static int nf_tables_fill_chain_info(struct sk_buff *skb, u32 portid, u32 seq, + int event, u32 flags, int family, + const struct nft_table *table, + const struct nft_chain *chain) +{ + struct nlmsghdr *nlh; + struct nfgenmsg *nfmsg; + + event |= NFNL_SUBSYS_NFTABLES << 8; + nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags); + if (nlh == NULL) + goto nla_put_failure; + + nfmsg = nlmsg_data(nlh); + nfmsg->nfgen_family = family; + nfmsg->version = NFNETLINK_V0; + nfmsg->res_id = 0; + + if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name)) + goto nla_put_failure; + if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle))) + goto nla_put_failure; + if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name)) + goto nla_put_failure; + + if (chain->flags & NFT_BASE_CHAIN) { + const struct nf_hook_ops *ops = &nft_base_chain(chain)->ops; + struct nlattr *nest = nla_nest_start(skb, NFTA_CHAIN_HOOK); + if (nest == NULL) + goto nla_put_failure; + if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum))) + goto nla_put_failure; + if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority))) + goto nla_put_failure; + nla_nest_end(skb, nest); + } + + return nlmsg_end(skb, nlh); + +nla_put_failure: + nlmsg_trim(skb, nlh); + return -1; +} + +static int nf_tables_chain_notify(const struct sk_buff *oskb, + const struct nlmsghdr *nlh, + const struct nft_table *table, + const struct nft_chain *chain, + int event, int family) +{ + struct sk_buff *skb; + u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; + struct net *net = oskb ? sock_net(oskb->sk) : &init_net; + u32 seq = nlh ? nlh->nlmsg_seq : 0; + bool report; + int err; + + report = nlh ? nlmsg_report(nlh) : false; + if (!report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) + return 0; + + err = -ENOBUFS; + skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); + if (skb == NULL) + goto err; + + err = nf_tables_fill_chain_info(skb, portid, seq, event, 0, family, + table, chain); + if (err < 0) { + kfree_skb(skb); + goto err; + } + + err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, + GFP_KERNEL); +err: + if (err < 0) + nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err); + return err; +} + +static int nf_tables_dump_chains(struct sk_buff *skb, + struct netlink_callback *cb) +{ + const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); + const struct nft_af_info *afi; + const struct nft_table *table; + const struct nft_chain *chain; + unsigned int idx = 0, s_idx = cb->args[0]; + int family = nfmsg->nfgen_family; + + list_for_each_entry(afi, &nf_tables_afinfo, list) { + if (family != NFPROTO_UNSPEC && family != afi->family) + continue; + + list_for_each_entry(table, &afi->tables, list) { + list_for_each_entry(chain, &table->chains, list) { + if (idx < s_idx) + goto cont; + if (idx > s_idx) + memset(&cb->args[1], 0, + sizeof(cb->args) - sizeof(cb->args[0])); + if (nf_tables_fill_chain_info(skb, NETLINK_CB(cb->skb).portid, + cb->nlh->nlmsg_seq, + NFT_MSG_NEWCHAIN, + NLM_F_MULTI, + afi->family, table, chain) < 0) + goto done; +cont: + idx++; + } + } + } +done: + cb->args[0] = idx; + return skb->len; +} + + +static int nf_tables_getchain(struct sock *nlsk, struct sk_buff *skb, + const struct nlmsghdr *nlh, + const struct nlattr * const nla[]) +{ + const struct nfgenmsg *nfmsg = nlmsg_data(nlh); + const struct nft_af_info *afi; + const struct nft_table *table; + const struct nft_chain *chain; + struct sk_buff *skb2; + int family = nfmsg->nfgen_family; + int err; + + if (nlh->nlmsg_flags & NLM_F_DUMP) { + struct netlink_dump_control c = { + .dump = nf_tables_dump_chains, + }; + return netlink_dump_start(nlsk, skb, nlh, &c); + } + + afi = nf_tables_afinfo_lookup(family, false); + if (IS_ERR(afi)) + return PTR_ERR(afi); + + table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], false); + if (IS_ERR(table)) + return PTR_ERR(table); + + chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]); + if (IS_ERR(chain)) + return PTR_ERR(chain); + + skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); + if (!skb2) + return -ENOMEM; + + err = nf_tables_fill_chain_info(skb2, NETLINK_CB(skb).portid, + nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0, + family, table, chain); + if (err < 0) + goto err; + + return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); + +err: + kfree_skb(skb2); + return err; +} + +static int nf_tables_newchain(struct sock *nlsk, struct sk_buff *skb, + const struct nlmsghdr *nlh, + const struct nlattr * const nla[]) +{ + const struct nfgenmsg *nfmsg = nlmsg_data(nlh); + const struct nlattr * uninitialized_var(name); + const struct nft_af_info *afi; + struct nft_table *table; + struct nft_chain *chain; + struct nft_base_chain *basechain; + struct nlattr *ha[NFTA_HOOK_MAX + 1]; + int family = nfmsg->nfgen_family; + u64 handle = 0; + int err; + bool create; + + create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; + + afi = nf_tables_afinfo_lookup(family, true); + if (IS_ERR(afi)) + return PTR_ERR(afi); + + table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], create); + if (IS_ERR(table)) + return PTR_ERR(table); + + if (table->use == UINT_MAX) + return -EOVERFLOW; + + chain = NULL; + name = nla[NFTA_CHAIN_NAME]; + + if (nla[NFTA_CHAIN_HANDLE]) { + handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE])); + chain = nf_tables_chain_lookup_byhandle(table, handle); + if (IS_ERR(chain)) + return PTR_ERR(chain); + } else { + chain = nf_tables_chain_lookup(table, name); + if (IS_ERR(chain)) { + if (PTR_ERR(chain) != -ENOENT) + return PTR_ERR(chain); + chain = NULL; + } + } + + if (chain != NULL) { + if (nlh->nlmsg_flags & NLM_F_EXCL) + return -EEXIST; + if (nlh->nlmsg_flags & NLM_F_REPLACE) + return -EOPNOTSUPP; + + if (nla[NFTA_CHAIN_HANDLE] && name && + !IS_ERR(nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]))) + return -EEXIST; + + if (nla[NFTA_CHAIN_HANDLE] && name) + nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN); + + goto notify; + } + + if (nla[NFTA_CHAIN_HOOK]) { + struct nf_hook_ops *ops; + + err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK], + nft_hook_policy); + if (err < 0) + return err; + if (ha[NFTA_HOOK_HOOKNUM] == NULL || + ha[NFTA_HOOK_PRIORITY] == NULL) + return -EINVAL; + if (ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM])) >= afi->nhooks) + return -EINVAL; + + basechain = kzalloc(sizeof(*basechain), GFP_KERNEL); + if (basechain == NULL) + return -ENOMEM; + chain = &basechain->chain; + + ops = &basechain->ops; + ops->pf = family; + ops->owner = afi->owner; + ops->hooknum = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM])); + ops->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY])); + ops->priv = chain; + ops->hook = nft_do_chain; + if (afi->hooks[ops->hooknum]) + ops->hook = afi->hooks[ops->hooknum]; + + chain->flags |= NFT_BASE_CHAIN; + } else { + chain = kzalloc(sizeof(*chain), GFP_KERNEL); + if (chain == NULL) + return -ENOMEM; + } + + INIT_LIST_HEAD(&chain->rules); + chain->handle = nf_tables_alloc_handle(table); + nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN); + + list_add_tail(&chain->list, &table->chains); + table->use++; +notify: + nf_tables_chain_notify(skb, nlh, table, chain, NFT_MSG_NEWCHAIN, + family); + return 0; +} + +static void nf_tables_rcu_chain_destroy(struct rcu_head *head) +{ + struct nft_chain *chain = container_of(head, struct nft_chain, rcu_head); + + BUG_ON(chain->use > 0); + + if (chain->flags & NFT_BASE_CHAIN) + kfree(nft_base_chain(chain)); + else + kfree(chain); +} + +static int nf_tables_delchain(struct sock *nlsk, struct sk_buff *skb, + const struct nlmsghdr *nlh, + const struct nlattr * const nla[]) +{ + const struct nfgenmsg *nfmsg = nlmsg_data(nlh); + const struct nft_af_info *afi; + struct nft_table *table; + struct nft_chain *chain; + int family = nfmsg->nfgen_family; + + afi = nf_tables_afinfo_lookup(family, false); + if (IS_ERR(afi)) + return PTR_ERR(afi); + + table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], false); + if (IS_ERR(table)) + return PTR_ERR(table); + + chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]); + if (IS_ERR(chain)) + return PTR_ERR(chain); + + if (chain->flags & NFT_CHAIN_BUILTIN) + return -EOPNOTSUPP; + + if (!list_empty(&chain->rules)) + return -EBUSY; + + list_del(&chain->list); + table->use--; + + if (chain->flags & NFT_BASE_CHAIN) + nf_unregister_hook(&nft_base_chain(chain)->ops); + + nf_tables_chain_notify(skb, nlh, table, chain, NFT_MSG_DELCHAIN, + family); + + /* Make sure all rule references are gone before this is released */ + call_rcu(&chain->rcu_head, nf_tables_rcu_chain_destroy); + return 0; +} + +static void nft_ctx_init(struct nft_ctx *ctx, + const struct nft_af_info *afi, + const struct nft_table *table, + const struct nft_chain *chain) +{ + ctx->afi = afi; + ctx->table = table; + ctx->chain = chain; +} + +/* + * Expressions + */ + +/** + * nft_register_expr - register nf_tables expr operations + * @ops: expr operations + * + * Registers the expr operations for use with nf_tables. Returns zero on + * success or a negative errno code otherwise. + */ +int nft_register_expr(struct nft_expr_ops *ops) +{ + nfnl_lock(NFNL_SUBSYS_NFTABLES); + list_add_tail(&ops->list, &nf_tables_expressions); + nfnl_unlock(NFNL_SUBSYS_NFTABLES); + return 0; +} +EXPORT_SYMBOL_GPL(nft_register_expr); + +/** + * nft_unregister_expr - unregister nf_tables expr operations + * @ops: expr operations + * + * Unregisters the expr operations for use with nf_tables. + */ +void nft_unregister_expr(struct nft_expr_ops *ops) +{ + nfnl_lock(NFNL_SUBSYS_NFTABLES); + list_del(&ops->list); + nfnl_unlock(NFNL_SUBSYS_NFTABLES); +} +EXPORT_SYMBOL_GPL(nft_unregister_expr); + +static const struct nft_expr_ops *__nft_expr_ops_get(struct nlattr *nla) +{ + const struct nft_expr_ops *ops; + + list_for_each_entry(ops, &nf_tables_expressions, list) { + if (!nla_strcmp(nla, ops->name)) + return ops; + } + return NULL; +} + +static const struct nft_expr_ops *nft_expr_ops_get(struct nlattr *nla) +{ + const struct nft_expr_ops *ops; + + if (nla == NULL) + return ERR_PTR(-EINVAL); + + ops = __nft_expr_ops_get(nla); + if (ops != NULL && try_module_get(ops->owner)) + return ops; + +#ifdef CONFIG_MODULES + if (ops == NULL) { + nfnl_unlock(NFNL_SUBSYS_NFTABLES); + request_module("nft-expr-%.*s", + nla_len(nla), (char *)nla_data(nla)); + nfnl_lock(NFNL_SUBSYS_NFTABLES); + if (__nft_expr_ops_get(nla)) + return ERR_PTR(-EAGAIN); + } +#endif + return ERR_PTR(-ENOENT); +} + +static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = { + [NFTA_EXPR_NAME] = { .type = NLA_STRING }, + [NFTA_EXPR_DATA] = { .type = NLA_NESTED }, +}; + +static int nf_tables_fill_expr_info(struct sk_buff *skb, + const struct nft_expr *expr) +{ + if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->name)) + goto nla_put_failure; + + if (expr->ops->dump) { + struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA); + if (data == NULL) + goto nla_put_failure; + if (expr->ops->dump(skb, expr) < 0) + goto nla_put_failure; + nla_nest_end(skb, data); + } + + return skb->len; + +nla_put_failure: + return -1; +}; + +struct nft_expr_info { + const struct nft_expr_ops *ops; + struct nlattr *tb[NFTA_EXPR_MAX + 1]; +}; + +static int nf_tables_expr_parse(const struct nlattr *nla, + struct nft_expr_info *info) +{ + const struct nft_expr_ops *ops; + int err; + + err = nla_parse_nested(info->tb, NFTA_EXPR_MAX, nla, nft_expr_policy); + if (err < 0) + return err; + + ops = nft_expr_ops_get(info->tb[NFTA_EXPR_NAME]); + if (IS_ERR(ops)) + return PTR_ERR(ops); + info->ops = ops; + return 0; +} + +static int nf_tables_newexpr(const struct nft_ctx *ctx, + struct nft_expr_info *info, + struct nft_expr *expr) +{ + const struct nft_expr_ops *ops = info->ops; + int err; + + expr->ops = ops; + if (ops->init) { + struct nlattr *ma[ops->maxattr + 1]; + + if (info->tb[NFTA_EXPR_DATA]) { + err = nla_parse_nested(ma, ops->maxattr, + info->tb[NFTA_EXPR_DATA], + ops->policy); + if (err < 0) + goto err1; + } else + memset(ma, 0, sizeof(ma[0]) * (ops->maxattr + 1)); + + err = ops->init(ctx, expr, (const struct nlattr **)ma); + if (err < 0) + goto err1; + } + + info->ops = NULL; + return 0; + +err1: + expr->ops = NULL; + return err; +} + +static void nf_tables_expr_destroy(struct nft_expr *expr) +{ + if (expr->ops->destroy) + expr->ops->destroy(expr); + module_put(expr->ops->owner); +} + +/* + * Rules + */ + +static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain, + u64 handle) +{ + struct nft_rule *rule; + + // FIXME: this sucks + list_for_each_entry(rule, &chain->rules, list) { + if (handle == rule->handle) + return rule; + } + + return ERR_PTR(-ENOENT); +} + +static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain, + const struct nlattr *nla) +{ + if (nla == NULL) + return ERR_PTR(-EINVAL); + + return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla))); +} + +static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = { + [NFTA_RULE_TABLE] = { .type = NLA_STRING }, + [NFTA_RULE_CHAIN] = { .type = NLA_STRING, + .len = NFT_CHAIN_MAXNAMELEN - 1 }, + [NFTA_RULE_HANDLE] = { .type = NLA_U64 }, + [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED }, +}; + +static int nf_tables_fill_rule_info(struct sk_buff *skb, u32 portid, u32 seq, + int event, u32 flags, int family, + const struct nft_table *table, + const struct nft_chain *chain, + const struct nft_rule *rule) +{ + struct nlmsghdr *nlh; + struct nfgenmsg *nfmsg; + const struct nft_expr *expr, *next; + struct nlattr *list; + + event |= NFNL_SUBSYS_NFTABLES << 8; + nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), + flags); + if (nlh == NULL) + goto nla_put_failure; + + nfmsg = nlmsg_data(nlh); + nfmsg->nfgen_family = family; + nfmsg->version = NFNETLINK_V0; + nfmsg->res_id = 0; + + if (nla_put_string(skb, NFTA_RULE_TABLE, table->name)) + goto nla_put_failure; + if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name)) + goto nla_put_failure; + if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle))) + goto nla_put_failure; + + list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS); + if (list == NULL) + goto nla_put_failure; + nft_rule_for_each_expr(expr, next, rule) { + struct nlattr *elem = nla_nest_start(skb, NFTA_LIST_ELEM); + if (elem == NULL) + goto nla_put_failure; + if (nf_tables_fill_expr_info(skb, expr) < 0) + goto nla_put_failure; + nla_nest_end(skb, elem); + } + nla_nest_end(skb, list); + + return nlmsg_end(skb, nlh); + +nla_put_failure: + nlmsg_trim(skb, nlh); + return -1; +} + +static int nf_tables_rule_notify(const struct sk_buff *oskb, + const struct nlmsghdr *nlh, + const struct nft_table *table, + const struct nft_chain *chain, + const struct nft_rule *rule, + int event, u32 flags, int family) +{ + struct sk_buff *skb; + u32 portid = NETLINK_CB(oskb).portid; + struct net *net = oskb ? sock_net(oskb->sk) : &init_net; + u32 seq = nlh->nlmsg_seq; + bool report; + int err; + + report = nlmsg_report(nlh); + if (!report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) + return 0; + + err = -ENOBUFS; + skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); + if (skb == NULL) + goto err; + + err = nf_tables_fill_rule_info(skb, portid, seq, event, flags, + family, table, chain, rule); + if (err < 0) { + kfree_skb(skb); + goto err; + } + + err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, + GFP_KERNEL); +err: + if (err < 0) + nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err); + return err; +} + +static int nf_tables_dump_rules(struct sk_buff *skb, + struct netlink_callback *cb) +{ + const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); + const struct nft_af_info *afi; + const struct nft_table *table; + const struct nft_chain *chain; + const struct nft_rule *rule; + unsigned int idx = 0, s_idx = cb->args[0]; + int family = nfmsg->nfgen_family; + + list_for_each_entry(afi, &nf_tables_afinfo, list) { + if (family != NFPROTO_UNSPEC && family != afi->family) + continue; + + list_for_each_entry(table, &afi->tables, list) { + list_for_each_entry(chain, &table->chains, list) { + list_for_each_entry(rule, &chain->rules, list) { + if (idx < s_idx) + goto cont; + if (idx > s_idx) + memset(&cb->args[1], 0, + sizeof(cb->args) - sizeof(cb->args[0])); + if (nf_tables_fill_rule_info(skb, NETLINK_CB(cb->skb).portid, + cb->nlh->nlmsg_seq, + NFT_MSG_NEWRULE, + NLM_F_MULTI | NLM_F_APPEND, + afi->family, table, chain, rule) < 0) + goto done; +cont: + idx++; + } + } + } + } +done: + cb->args[0] = idx; + return skb->len; +} + +static int nf_tables_getrule(struct sock *nlsk, struct sk_buff *skb, + const struct nlmsghdr *nlh, + const struct nlattr * const nla[]) +{ + const struct nfgenmsg *nfmsg = nlmsg_data(nlh); + const struct nft_af_info *afi; + const struct nft_table *table; + const struct nft_chain *chain; + const struct nft_rule *rule; + struct sk_buff *skb2; + int family = nfmsg->nfgen_family; + int err; + + if (nlh->nlmsg_flags & NLM_F_DUMP) { + struct netlink_dump_control c = { + .dump = nf_tables_dump_rules, + }; + return netlink_dump_start(nlsk, skb, nlh, &c); + } + + afi = nf_tables_afinfo_lookup(family, false); + if (IS_ERR(afi)) + return PTR_ERR(afi); + + table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], false); + if (IS_ERR(table)) + return PTR_ERR(table); + + chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]); + if (IS_ERR(chain)) + return PTR_ERR(chain); + + rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]); + if (IS_ERR(rule)) + return PTR_ERR(rule); + + skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); + if (!skb2) + return -ENOMEM; + + err = nf_tables_fill_rule_info(skb2, NETLINK_CB(skb).portid, + nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0, + family, table, chain, rule); + if (err < 0) + goto err; + + return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); + +err: + kfree_skb(skb2); + return err; +} + +static void nf_tables_rcu_rule_destroy(struct rcu_head *head) +{ + struct nft_rule *rule = container_of(head, struct nft_rule, rcu_head); + struct nft_expr *expr; + + /* + * Careful: some expressions might not be initialized in case this + * is called on error from nf_tables_newrule(). + */ + expr = nft_expr_first(rule); + while (expr->ops && expr != nft_expr_last(rule)) { + nf_tables_expr_destroy(expr); + expr = nft_expr_next(expr); + } + kfree(rule); +} + +static void nf_tables_rule_destroy(struct nft_rule *rule) +{ + call_rcu(&rule->rcu_head, nf_tables_rcu_rule_destroy); +} + +#define NFT_RULE_MAXEXPRS 128 + +static struct nft_expr_info *info; + +static int nf_tables_newrule(struct sock *nlsk, struct sk_buff *skb, + const struct nlmsghdr *nlh, + const struct nlattr * const nla[]) +{ + const struct nfgenmsg *nfmsg = nlmsg_data(nlh); + const struct nft_af_info *afi; + struct nft_table *table; + struct nft_chain *chain; + struct nft_rule *rule, *old_rule = NULL; + struct nft_expr *expr; + struct nft_ctx ctx; + struct nlattr *tmp; + unsigned int size, i, n; + int err, rem; + bool create; + u64 handle; + + create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; + + afi = nf_tables_afinfo_lookup(nfmsg->nfgen_family, create); + if (IS_ERR(afi)) + return PTR_ERR(afi); + + table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], create); + if (IS_ERR(table)) + return PTR_ERR(table); + + chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]); + if (IS_ERR(chain)) + return PTR_ERR(chain); + + if (nla[NFTA_RULE_HANDLE]) { + handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE])); + rule = __nf_tables_rule_lookup(chain, handle); + if (IS_ERR(rule)) + return PTR_ERR(rule); + + if (nlh->nlmsg_flags & NLM_F_EXCL) + return -EEXIST; + if (nlh->nlmsg_flags & NLM_F_REPLACE) + old_rule = rule; + else + return -EOPNOTSUPP; + } else { + if (!create || nlh->nlmsg_flags & NLM_F_REPLACE) + return -EINVAL; + handle = nf_tables_alloc_handle(table); + } + + n = 0; + size = 0; + if (nla[NFTA_RULE_EXPRESSIONS]) { + nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) { + err = -EINVAL; + if (nla_type(tmp) != NFTA_LIST_ELEM) + goto err1; + if (n == NFT_RULE_MAXEXPRS) + goto err1; + err = nf_tables_expr_parse(tmp, &info[n]); + if (err < 0) + goto err1; + size += info[n].ops->size; + n++; + } + } + + err = -ENOMEM; + rule = kzalloc(sizeof(*rule) + size, GFP_KERNEL); + if (rule == NULL) + goto err1; + + rule->handle = handle; + rule->dlen = size; + + nft_ctx_init(&ctx, afi, table, chain); + expr = nft_expr_first(rule); + for (i = 0; i < n; i++) { + err = nf_tables_newexpr(&ctx, &info[i], expr); + if (err < 0) + goto err2; + expr = nft_expr_next(expr); + } + + /* Register hook when first rule is inserted into a base chain */ + if (list_empty(&chain->rules) && chain->flags & NFT_BASE_CHAIN) { + err = nf_register_hook(&nft_base_chain(chain)->ops); + if (err < 0) + goto err2; + } + + if (nlh->nlmsg_flags & NLM_F_REPLACE) { + list_replace_rcu(&old_rule->list, &rule->list); + nf_tables_rule_destroy(old_rule); + } else if (nlh->nlmsg_flags & NLM_F_APPEND) + list_add_tail_rcu(&rule->list, &chain->rules); + else + list_add_rcu(&rule->list, &chain->rules); + + nf_tables_rule_notify(skb, nlh, table, chain, rule, NFT_MSG_NEWRULE, + nlh->nlmsg_flags & (NLM_F_APPEND | NLM_F_REPLACE), + nfmsg->nfgen_family); + return 0; + +err2: + nf_tables_rule_destroy(rule); +err1: + for (i = 0; i < n; i++) { + if (info[i].ops != NULL) + module_put(info[i].ops->owner); + } + return err; +} + +static int nf_tables_delrule(struct sock *nlsk, struct sk_buff *skb, + const struct nlmsghdr *nlh, + const struct nlattr * const nla[]) +{ + const struct nfgenmsg *nfmsg = nlmsg_data(nlh); + const struct nft_af_info *afi; + const struct nft_table *table; + struct nft_chain *chain; + struct nft_rule *rule, *tmp; + int family = nfmsg->nfgen_family; + + afi = nf_tables_afinfo_lookup(family, false); + if (IS_ERR(afi)) + return PTR_ERR(afi); + + table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], false); + if (IS_ERR(table)) + return PTR_ERR(table); + + chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]); + if (IS_ERR(chain)) + return PTR_ERR(chain); + + if (nla[NFTA_RULE_HANDLE]) { + rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]); + if (IS_ERR(rule)) + return PTR_ERR(rule); + + /* List removal must be visible before destroying expressions */ + list_del_rcu(&rule->list); + + nf_tables_rule_notify(skb, nlh, table, chain, rule, + NFT_MSG_DELRULE, 0, family); + nf_tables_rule_destroy(rule); + } else { + /* Remove all rules in this chain */ + list_for_each_entry_safe(rule, tmp, &chain->rules, list) { + list_del_rcu(&rule->list); + + nf_tables_rule_notify(skb, nlh, table, chain, rule, + NFT_MSG_DELRULE, 0, family); + nf_tables_rule_destroy(rule); + } + } + + /* Unregister hook when last rule from base chain is deleted */ + if (list_empty(&chain->rules) && chain->flags & NFT_BASE_CHAIN) + nf_unregister_hook(&nft_base_chain(chain)->ops); + + return 0; +} + +static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = { + [NFT_MSG_NEWTABLE] = { + .call = nf_tables_newtable, + .attr_count = NFTA_TABLE_MAX, + .policy = nft_table_policy, + }, + [NFT_MSG_GETTABLE] = { + .call = nf_tables_gettable, + .attr_count = NFTA_TABLE_MAX, + .policy = nft_table_policy, + }, + [NFT_MSG_DELTABLE] = { + .call = nf_tables_deltable, + .attr_count = NFTA_TABLE_MAX, + .policy = nft_table_policy, + }, + [NFT_MSG_NEWCHAIN] = { + .call = nf_tables_newchain, + .attr_count = NFTA_CHAIN_MAX, + .policy = nft_chain_policy, + }, + [NFT_MSG_GETCHAIN] = { + .call = nf_tables_getchain, + .attr_count = NFTA_CHAIN_MAX, + .policy = nft_chain_policy, + }, + [NFT_MSG_DELCHAIN] = { + .call = nf_tables_delchain, + .attr_count = NFTA_CHAIN_MAX, + .policy = nft_chain_policy, + }, + [NFT_MSG_NEWRULE] = { + .call = nf_tables_newrule, + .attr_count = NFTA_RULE_MAX, + .policy = nft_rule_policy, + }, + [NFT_MSG_GETRULE] = { + .call = nf_tables_getrule, + .attr_count = NFTA_RULE_MAX, + .policy = nft_rule_policy, + }, + [NFT_MSG_DELRULE] = { + .call = nf_tables_delrule, + .attr_count = NFTA_RULE_MAX, + .policy = nft_rule_policy, + }, +}; + +static const struct nfnetlink_subsystem nf_tables_subsys = { + .name = "nf_tables", + .subsys_id = NFNL_SUBSYS_NFTABLES, + .cb_count = NFT_MSG_MAX, + .cb = nf_tables_cb, +}; + +/** + * nft_validate_input_register - validate an expressions' input register + * + * @reg: the register number + * + * Validate that the input register is one of the general purpose + * registers. + */ +int nft_validate_input_register(enum nft_registers reg) +{ + if (reg <= NFT_REG_VERDICT) + return -EINVAL; + if (reg > NFT_REG_MAX) + return -ERANGE; + return 0; +} +EXPORT_SYMBOL_GPL(nft_validate_input_register); + +/** + * nft_validate_output_register - validate an expressions' output register + * + * @reg: the register number + * + * Validate that the output register is one of the general purpose + * registers or the verdict register. + */ +int nft_validate_output_register(enum nft_registers reg) +{ + if (reg < NFT_REG_VERDICT) + return -EINVAL; + if (reg > NFT_REG_MAX) + return -ERANGE; + return 0; +} +EXPORT_SYMBOL_GPL(nft_validate_output_register); + +/** + * nft_validate_data_load - validate an expressions' data load + * + * @ctx: context of the expression performing the load + * @reg: the destination register number + * @data: the data to load + * @type: the data type + * + * Validate that a data load uses the appropriate data type for + * the destination register. A value of NULL for the data means + * that its runtime gathered data, which is always of type + * NFT_DATA_VALUE. + */ +int nft_validate_data_load(const struct nft_ctx *ctx, enum nft_registers reg, + const struct nft_data *data, + enum nft_data_types type) +{ + switch (reg) { + case NFT_REG_VERDICT: + if (data == NULL || type != NFT_DATA_VERDICT) + return -EINVAL; + // FIXME: do loop detection + return 0; + default: + if (data != NULL && type != NFT_DATA_VALUE) + return -EINVAL; + return 0; + } +} +EXPORT_SYMBOL_GPL(nft_validate_data_load); + +static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = { + [NFTA_VERDICT_CODE] = { .type = NLA_U32 }, + [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING, + .len = NFT_CHAIN_MAXNAMELEN - 1 }, +}; + +static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data, + struct nft_data_desc *desc, const struct nlattr *nla) +{ + struct nlattr *tb[NFTA_VERDICT_MAX + 1]; + struct nft_chain *chain; + int err; + + err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy); + if (err < 0) + return err; + + if (!tb[NFTA_VERDICT_CODE]) + return -EINVAL; + data->verdict = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE])); + + switch (data->verdict) { + case NF_ACCEPT: + case NF_DROP: + case NF_QUEUE: + case NFT_CONTINUE: + case NFT_BREAK: + case NFT_RETURN: + desc->len = sizeof(data->verdict); + break; + case NFT_JUMP: + case NFT_GOTO: + if (!tb[NFTA_VERDICT_CHAIN]) + return -EINVAL; + chain = nf_tables_chain_lookup(ctx->table, + tb[NFTA_VERDICT_CHAIN]); + if (IS_ERR(chain)) + return PTR_ERR(chain); + if (chain->flags & NFT_BASE_CHAIN) + return -EOPNOTSUPP; + + if (ctx->chain->level + 1 > chain->level) { + if (ctx->chain->level + 1 == 16) + return -EMLINK; + chain->level = ctx->chain->level + 1; + } + chain->use++; + data->chain = chain; + desc->len = sizeof(data); + break; + default: + return -EINVAL; + } + + desc->type = NFT_DATA_VERDICT; + return 0; +} + +static void nft_verdict_uninit(const struct nft_data *data) +{ + switch (data->verdict) { + case NFT_JUMP: + case NFT_GOTO: + data->chain->use--; + break; + } +} + +static int nft_verdict_dump(struct sk_buff *skb, const struct nft_data *data) +{ + struct nlattr *nest; + + nest = nla_nest_start(skb, NFTA_DATA_VERDICT); + if (!nest) + goto nla_put_failure; + + if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(data->verdict))) + goto nla_put_failure; + + switch (data->verdict) { + case NFT_JUMP: + case NFT_GOTO: + if (nla_put_string(skb, NFTA_VERDICT_CHAIN, data->chain->name)) + goto nla_put_failure; + } + nla_nest_end(skb, nest); + return 0; + +nla_put_failure: + return -1; +} + +static int nft_value_init(const struct nft_ctx *ctx, struct nft_data *data, + struct nft_data_desc *desc, const struct nlattr *nla) +{ + unsigned int len; + + len = nla_len(nla); + if (len == 0) + return -EINVAL; + if (len > sizeof(data->data)) + return -EOVERFLOW; + + nla_memcpy(data->data, nla, sizeof(data->data)); + desc->type = NFT_DATA_VALUE; + desc->len = len; + return 0; +} + +static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data, + unsigned int len) +{ + return nla_put(skb, NFTA_DATA_VALUE, len, data->data); +} + +static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = { + [NFTA_DATA_VALUE] = { .type = NLA_BINARY, + .len = FIELD_SIZEOF(struct nft_data, data) }, + [NFTA_DATA_VERDICT] = { .type = NLA_NESTED }, +}; + +/** + * nft_data_init - parse nf_tables data netlink attributes + * + * @ctx: context of the expression using the data + * @data: destination struct nft_data + * @desc: data description + * @nla: netlink attribute containing data + * + * Parse the netlink data attributes and initialize a struct nft_data. + * The type and length of data are returned in the data description. + * + * The caller can indicate that it only wants to accept data of type + * NFT_DATA_VALUE by passing NULL for the ctx argument. + */ +int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data, + struct nft_data_desc *desc, const struct nlattr *nla) +{ + struct nlattr *tb[NFTA_DATA_MAX + 1]; + int err; + + err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy); + if (err < 0) + return err; + + if (tb[NFTA_DATA_VALUE]) + return nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]); + if (tb[NFTA_DATA_VERDICT] && ctx != NULL) + return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]); + return -EINVAL; +} +EXPORT_SYMBOL_GPL(nft_data_init); + +/** + * nft_data_uninit - release a nft_data item + * + * @data: struct nft_data to release + * @type: type of data + * + * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded, + * all others need to be released by calling this function. + */ +void nft_data_uninit(const struct nft_data *data, enum nft_data_types type) +{ + switch (type) { + case NFT_DATA_VALUE: + return; + case NFT_DATA_VERDICT: + return nft_verdict_uninit(data); + default: + WARN_ON(1); + } +} +EXPORT_SYMBOL_GPL(nft_data_uninit); + +int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data, + enum nft_data_types type, unsigned int len) +{ + struct nlattr *nest; + int err; + + nest = nla_nest_start(skb, attr); + if (nest == NULL) + return -1; + + switch (type) { + case NFT_DATA_VALUE: + err = nft_value_dump(skb, data, len); + break; + case NFT_DATA_VERDICT: + err = nft_verdict_dump(skb, data); + break; + default: + err = -EINVAL; + WARN_ON(1); + } + + nla_nest_end(skb, nest); + return err; +} +EXPORT_SYMBOL_GPL(nft_data_dump); + +static int __init nf_tables_module_init(void) +{ + int err; + + info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS, + GFP_KERNEL); + if (info == NULL) { + err = -ENOMEM; + goto err1; + } + + err = nf_tables_core_module_init(); + if (err < 0) + goto err2; + + err = nfnetlink_subsys_register(&nf_tables_subsys); + if (err < 0) + goto err3; + + pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n"); + return 0; +err3: + nf_tables_core_module_exit(); +err2: + kfree(info); +err1: + return err; +} + +static void __exit nf_tables_module_exit(void) +{ + nfnetlink_subsys_unregister(&nf_tables_subsys); + nf_tables_core_module_exit(); + kfree(info); +} + +module_init(nf_tables_module_init); +module_exit(nf_tables_module_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); +MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES); diff --git a/net/netfilter/nf_tables_core.c b/net/netfilter/nf_tables_core.c new file mode 100644 index 000000000000..bc7fb85d4002 --- /dev/null +++ b/net/netfilter/nf_tables_core.c @@ -0,0 +1,152 @@ +/* + * Copyright (c) 2008 Patrick McHardy <kaber@trash.net> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * Development of this code funded by Astaro AG (http://www.astaro.com/) + */ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/list.h> +#include <linux/rculist.h> +#include <linux/skbuff.h> +#include <linux/netlink.h> +#include <linux/netfilter.h> +#include <linux/netfilter/nfnetlink.h> +#include <linux/netfilter/nf_tables.h> +#include <net/netfilter/nf_tables_core.h> +#include <net/netfilter/nf_tables.h> + +#define NFT_JUMP_STACK_SIZE 16 + +unsigned int nft_do_chain(const struct nf_hook_ops *ops, + struct sk_buff *skb, + const struct net_device *in, + const struct net_device *out, + int (*okfn)(struct sk_buff *)) +{ + const struct nft_chain *chain = ops->priv; + const struct nft_rule *rule; + const struct nft_expr *expr, *last; + struct nft_data data[NFT_REG_MAX + 1]; + const struct nft_pktinfo pkt = { + .skb = skb, + .in = in, + .out = out, + .hooknum = ops->hooknum, + }; + unsigned int stackptr = 0; + struct { + const struct nft_chain *chain; + const struct nft_rule *rule; + } jumpstack[NFT_JUMP_STACK_SIZE]; + +do_chain: + rule = list_entry(&chain->rules, struct nft_rule, list); +next_rule: + data[NFT_REG_VERDICT].verdict = NFT_CONTINUE; + list_for_each_entry_continue_rcu(rule, &chain->rules, list) { + nft_rule_for_each_expr(expr, last, rule) { + expr->ops->eval(expr, data, &pkt); + if (data[NFT_REG_VERDICT].verdict != NFT_CONTINUE) + break; + } + + switch (data[NFT_REG_VERDICT].verdict) { + case NFT_BREAK: + data[NFT_REG_VERDICT].verdict = NFT_CONTINUE; + /* fall through */ + case NFT_CONTINUE: + continue; + } + break; + } + + switch (data[NFT_REG_VERDICT].verdict) { + case NF_ACCEPT: + case NF_DROP: + case NF_QUEUE: + return data[NFT_REG_VERDICT].verdict; + case NFT_JUMP: + BUG_ON(stackptr >= NFT_JUMP_STACK_SIZE); + jumpstack[stackptr].chain = chain; + jumpstack[stackptr].rule = rule; + stackptr++; + /* fall through */ + case NFT_GOTO: + chain = data[NFT_REG_VERDICT].chain; + goto do_chain; + case NFT_RETURN: + case NFT_CONTINUE: + break; + default: + WARN_ON(1); + } + + if (stackptr > 0) { + stackptr--; + chain = jumpstack[stackptr].chain; + rule = jumpstack[stackptr].rule; + goto next_rule; + } + + return NF_ACCEPT; +} +EXPORT_SYMBOL_GPL(nft_do_chain); + +int __init nf_tables_core_module_init(void) +{ + int err; + + err = nft_immediate_module_init(); + if (err < 0) + goto err1; + + err = nft_cmp_module_init(); + if (err < 0) + goto err2; + + err = nft_lookup_module_init(); + if (err < 0) + goto err3; + + err = nft_bitwise_module_init(); + if (err < 0) + goto err4; + + err = nft_byteorder_module_init(); + if (err < 0) + goto err5; + + err = nft_payload_module_init(); + if (err < 0) + goto err6; + + return 0; + +err6: + nft_byteorder_module_exit(); +err5: + nft_bitwise_module_exit(); +err4: + nft_lookup_module_exit(); +err3: + nft_cmp_module_exit(); +err2: + nft_immediate_module_exit(); +err1: + return err; +} + +void nf_tables_core_module_exit(void) +{ + nft_payload_module_exit(); + nft_byteorder_module_exit(); + nft_bitwise_module_exit(); + nft_lookup_module_exit(); + nft_cmp_module_exit(); + nft_immediate_module_exit(); +} diff --git a/net/netfilter/nft_bitwise.c b/net/netfilter/nft_bitwise.c new file mode 100644 index 000000000000..0f7501506367 --- /dev/null +++ b/net/netfilter/nft_bitwise.c @@ -0,0 +1,140 @@ +/* + * Copyright (c) 2008 Patrick McHardy <kaber@trash.net> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * Development of this code funded by Astaro AG (http://www.astaro.com/) + */ + +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/module.h> +#include <linux/netlink.h> +#include <linux/netfilter.h> +#include <linux/netfilter/nf_tables.h> +#include <net/netfilter/nf_tables_core.h> +#include <net/netfilter/nf_tables.h> + +struct nft_bitwise { + enum nft_registers sreg:8; + enum nft_registers dreg:8; + u8 len; + struct nft_data mask; + struct nft_data xor; +}; + +static void nft_bitwise_eval(const struct nft_expr *expr, + struct nft_data data[NFT_REG_MAX + 1], + const struct nft_pktinfo *pkt) +{ + const struct nft_bitwise *priv = nft_expr_priv(expr); + const struct nft_data *src = &data[priv->sreg]; + struct nft_data *dst = &data[priv->dreg]; + unsigned int i; + + for (i = 0; i < DIV_ROUND_UP(priv->len, 4); i++) { + dst->data[i] = (src->data[i] & priv->mask.data[i]) ^ + priv->xor.data[i]; + } +} + +static const struct nla_policy nft_bitwise_policy[NFTA_BITWISE_MAX + 1] = { + [NFTA_BITWISE_SREG] = { .type = NLA_U32 }, + [NFTA_BITWISE_DREG] = { .type = NLA_U32 }, + [NFTA_BITWISE_LEN] = { .type = NLA_U32 }, + [NFTA_BITWISE_MASK] = { .type = NLA_NESTED }, + [NFTA_BITWISE_XOR] = { .type = NLA_NESTED }, +}; + +static int nft_bitwise_init(const struct nft_ctx *ctx, + const struct nft_expr *expr, + const struct nlattr * const tb[]) +{ + struct nft_bitwise *priv = nft_expr_priv(expr); + struct nft_data_desc d1, d2; + int err; + + if (tb[NFTA_BITWISE_SREG] == NULL || + tb[NFTA_BITWISE_DREG] == NULL || + tb[NFTA_BITWISE_LEN] == NULL || + tb[NFTA_BITWISE_MASK] == NULL || + tb[NFTA_BITWISE_XOR] == NULL) + return -EINVAL; + + priv->sreg = ntohl(nla_get_be32(tb[NFTA_BITWISE_SREG])); + err = nft_validate_input_register(priv->sreg); + if (err < 0) + return err; + + priv->dreg = ntohl(nla_get_be32(tb[NFTA_BITWISE_DREG])); + err = nft_validate_output_register(priv->dreg); + if (err < 0) + return err; + err = nft_validate_data_load(ctx, priv->dreg, NULL, NFT_DATA_VALUE); + if (err < 0) + return err; + + priv->len = ntohl(nla_get_be32(tb[NFTA_BITWISE_LEN])); + + err = nft_data_init(NULL, &priv->mask, &d1, tb[NFTA_BITWISE_MASK]); + if (err < 0) + return err; + if (d1.len != priv->len) + return -EINVAL; + + err = nft_data_init(NULL, &priv->xor, &d2, tb[NFTA_BITWISE_XOR]); + if (err < 0) + return err; + if (d2.len != priv->len) + return -EINVAL; + + return 0; +} + +static int nft_bitwise_dump(struct sk_buff *skb, const struct nft_expr *expr) +{ + const struct nft_bitwise *priv = nft_expr_priv(expr); + + if (nla_put_be32(skb, NFTA_BITWISE_SREG, htonl(priv->sreg))) + goto nla_put_failure; + if (nla_put_be32(skb, NFTA_BITWISE_DREG, htonl(priv->dreg))) + goto nla_put_failure; + if (nla_put_be32(skb, NFTA_BITWISE_LEN, htonl(priv->len))) + goto nla_put_failure; + + if (nft_data_dump(skb, NFTA_BITWISE_MASK, &priv->mask, + NFT_DATA_VALUE, priv->len) < 0) + goto nla_put_failure; + + if (nft_data_dump(skb, NFTA_BITWISE_XOR, &priv->xor, + NFT_DATA_VALUE, priv->len) < 0) + goto nla_put_failure; + + return 0; + +nla_put_failure: + return -1; +} + +static struct nft_expr_ops nft_bitwise_ops __read_mostly = { + .name = "bitwise", + .size = NFT_EXPR_SIZE(sizeof(struct nft_bitwise)), + .owner = THIS_MODULE, + .eval = nft_bitwise_eval, + .init = nft_bitwise_init, + .dump = nft_bitwise_dump, + .policy = nft_bitwise_policy, + .maxattr = NFTA_BITWISE_MAX, +}; + +int __init nft_bitwise_module_init(void) +{ + return nft_register_expr(&nft_bitwise_ops); +} + +void nft_bitwise_module_exit(void) +{ + nft_unregister_expr(&nft_bitwise_ops); +} diff --git a/net/netfilter/nft_byteorder.c b/net/netfilter/nft_byteorder.c new file mode 100644 index 000000000000..8b0657a4d17b --- /dev/null +++ b/net/netfilter/nft_byteorder.c @@ -0,0 +1,167 @@ +/* + * Copyright (c) 2008 Patrick McHardy <kaber@trash.net> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * Development of this code funded by Astaro AG (http://www.astaro.com/) + */ + +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/module.h> +#include <linux/netlink.h> +#include <linux/netfilter.h> +#include <linux/netfilter/nf_tables.h> +#include <net/netfilter/nf_tables_core.h> +#include <net/netfilter/nf_tables.h> + +struct nft_byteorder { + enum nft_registers sreg:8; + enum nft_registers dreg:8; + enum nft_byteorder_ops op:8; + u8 len; + u8 size; +}; + +static void nft_byteorder_eval(const struct nft_expr *expr, + struct nft_data data[NFT_REG_MAX + 1], + const struct nft_pktinfo *pkt) +{ + const struct nft_byteorder *priv = nft_expr_priv(expr); + struct nft_data *src = &data[priv->sreg], *dst = &data[priv->dreg]; + union { u32 u32; u16 u16; } *s, *d; + unsigned int i; + + s = (void *)src->data; + d = (void *)dst->data; + + switch (priv->size) { + case 4: + switch (priv->op) { + case NFT_BYTEORDER_NTOH: + for (i = 0; i < priv->len / 4; i++) + d[i].u32 = ntohl((__force __be32)s[i].u32); + break; + case NFT_BYTEORDER_HTON: + for (i = 0; i < priv->len / 4; i++) + d[i].u32 = (__force __u32)htonl(s[i].u32); + break; + } + break; + case 2: + switch (priv->op) { + case NFT_BYTEORDER_NTOH: + for (i = 0; i < priv->len / 2; i++) + d[i].u16 = ntohs((__force __be16)s[i].u16); + break; + case NFT_BYTEORDER_HTON: + for (i = 0; i < priv->len / 2; i++) + d[i].u16 = (__force __u16)htons(s[i].u16); + break; + } + break; + } +} + +static const struct nla_policy nft_byteorder_policy[NFTA_BYTEORDER_MAX + 1] = { + [NFTA_BYTEORDER_SREG] = { .type = NLA_U32 }, + [NFTA_BYTEORDER_DREG] = { .type = NLA_U32 }, + [NFTA_BYTEORDER_OP] = { .type = NLA_U32 }, + [NFTA_BYTEORDER_LEN] = { .type = NLA_U32 }, + [NFTA_BYTEORDER_SIZE] = { .type = NLA_U32 }, +}; + +static int nft_byteorder_init(const struct nft_ctx *ctx, + const struct nft_expr *expr, + const struct nlattr * const tb[]) +{ + struct nft_byteorder *priv = nft_expr_priv(expr); + int err; + + if (tb[NFTA_BYTEORDER_SREG] == NULL || + tb[NFTA_BYTEORDER_DREG] == NULL || + tb[NFTA_BYTEORDER_LEN] == NULL || + tb[NFTA_BYTEORDER_SIZE] == NULL || + tb[NFTA_BYTEORDER_OP] == NULL) + return -EINVAL; + + priv->sreg = ntohl(nla_get_be32(tb[NFTA_BYTEORDER_SREG])); + err = nft_validate_input_register(priv->sreg); + if (err < 0) + return err; + + priv->dreg = ntohl(nla_get_be32(tb[NFTA_BYTEORDER_DREG])); + err = nft_validate_output_register(priv->dreg); + if (err < 0) + return err; + err = nft_validate_data_load(ctx, priv->dreg, NULL, NFT_DATA_VALUE); + if (err < 0) + return err; + + priv->op = ntohl(nla_get_be32(tb[NFTA_BYTEORDER_OP])); + switch (priv->op) { + case NFT_BYTEORDER_NTOH: + case NFT_BYTEORDER_HTON: + break; + default: + return -EINVAL; + } + + priv->len = ntohl(nla_get_be32(tb[NFTA_BYTEORDER_LEN])); + if (priv->len == 0 || priv->len > FIELD_SIZEOF(struct nft_data, data)) + return -EINVAL; + + priv->size = ntohl(nla_get_be32(tb[NFTA_BYTEORDER_SIZE])); + switch (priv->size) { + case 2: + case 4: + break; + default: + return -EINVAL; + } + + return 0; +} + +static int nft_byteorder_dump(struct sk_buff *skb, const struct nft_expr *expr) +{ + const struct nft_byteorder *priv = nft_expr_priv(expr); + + if (nla_put_be32(skb, NFTA_BYTEORDER_SREG, htonl(priv->sreg))) + goto nla_put_failure; + if (nla_put_be32(skb, NFTA_BYTEORDER_DREG, htonl(priv->dreg))) + goto nla_put_failure; + if (nla_put_be32(skb, NFTA_BYTEORDER_OP, htonl(priv->op))) + goto nla_put_failure; + if (nla_put_be32(skb, NFTA_BYTEORDER_LEN, htonl(priv->len))) + goto nla_put_failure; + if (nla_put_be32(skb, NFTA_BYTEORDER_SIZE, htonl(priv->size))) + goto nla_put_failure; + return 0; + +nla_put_failure: + return -1; +} + +static struct nft_expr_ops nft_byteorder_ops __read_mostly = { + .name = "byteorder", + .size = NFT_EXPR_SIZE(sizeof(struct nft_byteorder)), + .owner = THIS_MODULE, + .eval = nft_byteorder_eval, + .init = nft_byteorder_init, + .dump = nft_byteorder_dump, + .policy = nft_byteorder_policy, + .maxattr = NFTA_BYTEORDER_MAX, +}; + +int __init nft_byteorder_module_init(void) +{ + return nft_register_expr(&nft_byteorder_ops); +} + +void nft_byteorder_module_exit(void) +{ + nft_unregister_expr(&nft_byteorder_ops); +} diff --git a/net/netfilter/nft_cmp.c b/net/netfilter/nft_cmp.c new file mode 100644 index 000000000000..e734d670120a --- /dev/null +++ b/net/netfilter/nft_cmp.c @@ -0,0 +1,146 @@ +/* + * Copyright (c) 2008 Patrick McHardy <kaber@trash.net> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * Development of this code funded by Astaro AG (http://www.astaro.com/) + */ + +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/module.h> +#include <linux/netlink.h> +#include <linux/netfilter.h> +#include <linux/netfilter/nf_tables.h> +#include <net/netfilter/nf_tables_core.h> +#include <net/netfilter/nf_tables.h> + +struct nft_cmp_expr { + struct nft_data data; + enum nft_registers sreg:8; + u8 len; + enum nft_cmp_ops op:8; +}; + +static void nft_cmp_eval(const struct nft_expr *expr, + struct nft_data data[NFT_REG_MAX + 1], + const struct nft_pktinfo *pkt) +{ + const struct nft_cmp_expr *priv = nft_expr_priv(expr); + int d; + + d = nft_data_cmp(&data[priv->sreg], &priv->data, priv->len); + switch (priv->op) { + case NFT_CMP_EQ: + if (d != 0) + goto mismatch; + break; + case NFT_CMP_NEQ: + if (d == 0) + goto mismatch; + break; + case NFT_CMP_LT: + if (d == 0) + goto mismatch; + case NFT_CMP_LTE: + if (d > 0) + goto mismatch; + break; + case NFT_CMP_GT: + if (d == 0) + goto mismatch; + case NFT_CMP_GTE: + if (d < 0) + goto mismatch; + break; + } + return; + +mismatch: + data[NFT_REG_VERDICT].verdict = NFT_BREAK; +} + +static const struct nla_policy nft_cmp_policy[NFTA_CMP_MAX + 1] = { + [NFTA_CMP_SREG] = { .type = NLA_U32 }, + [NFTA_CMP_OP] = { .type = NLA_U32 }, + [NFTA_CMP_DATA] = { .type = NLA_NESTED }, +}; + +static int nft_cmp_init(const struct nft_ctx *ctx, const struct nft_expr *expr, + const struct nlattr * const tb[]) +{ + struct nft_cmp_expr *priv = nft_expr_priv(expr); + struct nft_data_desc desc; + int err; + + if (tb[NFTA_CMP_SREG] == NULL || + tb[NFTA_CMP_OP] == NULL || + tb[NFTA_CMP_DATA] == NULL) + return -EINVAL; + + priv->sreg = ntohl(nla_get_be32(tb[NFTA_CMP_SREG])); + err = nft_validate_input_register(priv->sreg); + if (err < 0) + return err; + + priv->op = ntohl(nla_get_be32(tb[NFTA_CMP_OP])); + switch (priv->op) { + case NFT_CMP_EQ: + case NFT_CMP_NEQ: + case NFT_CMP_LT: + case NFT_CMP_LTE: + case NFT_CMP_GT: + case NFT_CMP_GTE: + break; + default: + return -EINVAL; + } + + err = nft_data_init(NULL, &priv->data, &desc, tb[NFTA_CMP_DATA]); + if (err < 0) + return err; + + priv->len = desc.len; + return 0; +} + +static int nft_cmp_dump(struct sk_buff *skb, const struct nft_expr *expr) +{ + const struct nft_cmp_expr *priv = nft_expr_priv(expr); + + if (nla_put_be32(skb, NFTA_CMP_SREG, htonl(priv->sreg))) + goto nla_put_failure; + if (nla_put_be32(skb, NFTA_CMP_OP, htonl(priv->op))) + goto nla_put_failure; + + if (nft_data_dump(skb, NFTA_CMP_DATA, &priv->data, + NFT_DATA_VALUE, priv->len) < 0) + goto nla_put_failure; + return 0; + +nla_put_failure: + return -1; +} + +static struct nft_expr_ops nft_cmp_ops __read_mostly = { + .name = "cmp", + .size = NFT_EXPR_SIZE(sizeof(struct nft_cmp_expr)), + .owner = THIS_MODULE, + .eval = nft_cmp_eval, + .init = nft_cmp_init, + .dump = nft_cmp_dump, + .policy = nft_cmp_policy, + .maxattr = NFTA_CMP_MAX, +}; + +int __init nft_cmp_module_init(void) +{ + return nft_register_expr(&nft_cmp_ops); +} + +void nft_cmp_module_exit(void) +{ + nft_unregister_expr(&nft_cmp_ops); +} diff --git a/net/netfilter/nft_counter.c b/net/netfilter/nft_counter.c new file mode 100644 index 000000000000..33c5d36819bb --- /dev/null +++ b/net/netfilter/nft_counter.c @@ -0,0 +1,107 @@ +/* + * Copyright (c) 2008 Patrick McHardy <kaber@trash.net> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * Development of this code funded by Astaro AG (http://www.astaro.com/) + */ + +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/module.h> +#include <linux/seqlock.h> +#include <linux/netlink.h> +#include <linux/netfilter.h> +#include <linux/netfilter/nf_tables.h> +#include <net/netfilter/nf_tables.h> + +struct nft_counter { + seqlock_t lock; + u64 bytes; + u64 packets; +}; + +static void nft_counter_eval(const struct nft_expr *expr, + struct nft_data data[NFT_REG_MAX + 1], + const struct nft_pktinfo *pkt) +{ + struct nft_counter *priv = nft_expr_priv(expr); + + write_seqlock_bh(&priv->lock); + priv->bytes += pkt->skb->len; + priv->packets++; + write_sequnlock_bh(&priv->lock); +} + +static int nft_counter_dump(struct sk_buff *skb, const struct nft_expr *expr) +{ + struct nft_counter *priv = nft_expr_priv(expr); + unsigned int seq; + u64 bytes; + u64 packets; + + do { + seq = read_seqbegin(&priv->lock); + bytes = priv->bytes; + packets = priv->packets; + } while (read_seqretry(&priv->lock, seq)); + + if (nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(bytes))) + goto nla_put_failure; + if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(packets))) + goto nla_put_failure; + return 0; + +nla_put_failure: + return -1; +} + +static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = { + [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 }, + [NFTA_COUNTER_BYTES] = { .type = NLA_U64 }, +}; + +static int nft_counter_init(const struct nft_ctx *ctx, + const struct nft_expr *expr, + const struct nlattr * const tb[]) +{ + struct nft_counter *priv = nft_expr_priv(expr); + + if (tb[NFTA_COUNTER_PACKETS]) + priv->packets = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS])); + if (tb[NFTA_COUNTER_BYTES]) + priv->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES])); + + seqlock_init(&priv->lock); + return 0; +} + +static struct nft_expr_ops nft_counter_ops __read_mostly = { + .name = "counter", + .size = NFT_EXPR_SIZE(sizeof(struct nft_counter)), + .policy = nft_counter_policy, + .maxattr = NFTA_COUNTER_MAX, + .owner = THIS_MODULE, + .eval = nft_counter_eval, + .init = nft_counter_init, + .dump = nft_counter_dump, +}; + +static int __init nft_counter_module_init(void) +{ + return nft_register_expr(&nft_counter_ops); +} + +static void __exit nft_counter_module_exit(void) +{ + nft_unregister_expr(&nft_counter_ops); +} + +module_init(nft_counter_module_init); +module_exit(nft_counter_module_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); +MODULE_ALIAS_NFT_EXPR("counter"); diff --git a/net/netfilter/nft_ct.c b/net/netfilter/nft_ct.c new file mode 100644 index 000000000000..a1756d678226 --- /dev/null +++ b/net/netfilter/nft_ct.c @@ -0,0 +1,252 @@ +/* + * Copyright (c) 2008 Patrick McHardy <kaber@trash.net> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * Development of this code funded by Astaro AG (http://www.astaro.com/) + */ + +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/module.h> +#include <linux/netlink.h> +#include <linux/netfilter.h> +#include <linux/netfilter/nf_tables.h> +#include <net/netfilter/nf_tables.h> +#include <net/netfilter/nf_conntrack.h> +#include <net/netfilter/nf_conntrack_tuple.h> +#include <net/netfilter/nf_conntrack_helper.h> + +struct nft_ct { + enum nft_ct_keys key:8; + enum ip_conntrack_dir dir:8; + enum nft_registers dreg:8; + uint8_t family; +}; + +static void nft_ct_eval(const struct nft_expr *expr, + struct nft_data data[NFT_REG_MAX + 1], + const struct nft_pktinfo *pkt) +{ + const struct nft_ct *priv = nft_expr_priv(expr); + struct nft_data *dest = &data[priv->dreg]; + enum ip_conntrack_info ctinfo; + const struct nf_conn *ct; + const struct nf_conn_help *help; + const struct nf_conntrack_tuple *tuple; + const struct nf_conntrack_helper *helper; + long diff; + unsigned int state; + + ct = nf_ct_get(pkt->skb, &ctinfo); + + switch (priv->key) { + case NFT_CT_STATE: + if (ct == NULL) + state = NF_CT_STATE_INVALID_BIT; + else if (nf_ct_is_untracked(ct)) + state = NF_CT_STATE_UNTRACKED_BIT; + else + state = NF_CT_STATE_BIT(ctinfo); + dest->data[0] = state; + return; + } + + if (ct == NULL) + goto err; + + switch (priv->key) { + case NFT_CT_DIRECTION: + dest->data[0] = CTINFO2DIR(ctinfo); + return; + case NFT_CT_STATUS: + dest->data[0] = ct->status; + return; +#ifdef CONFIG_NF_CONNTRACK_MARK + case NFT_CT_MARK: + dest->data[0] = ct->mark; + return; +#endif +#ifdef CONFIG_NF_CONNTRACK_SECMARK + case NFT_CT_SECMARK: + dest->data[0] = ct->secmark; + return; +#endif + case NFT_CT_EXPIRATION: + diff = (long)jiffies - (long)ct->timeout.expires; + if (diff < 0) + diff = 0; + dest->data[0] = jiffies_to_msecs(diff); + return; + case NFT_CT_HELPER: + if (ct->master == NULL) + goto err; + help = nfct_help(ct->master); + if (help == NULL) + goto err; + helper = rcu_dereference(help->helper); + if (helper == NULL) + goto err; + if (strlen(helper->name) >= sizeof(dest->data)) + goto err; + strncpy((char *)dest->data, helper->name, sizeof(dest->data)); + return; + } + + tuple = &ct->tuplehash[priv->dir].tuple; + switch (priv->key) { + case NFT_CT_L3PROTOCOL: + dest->data[0] = nf_ct_l3num(ct); + return; + case NFT_CT_SRC: + memcpy(dest->data, tuple->src.u3.all, + nf_ct_l3num(ct) == NFPROTO_IPV4 ? 4 : 16); + return; + case NFT_CT_DST: + memcpy(dest->data, tuple->dst.u3.all, + nf_ct_l3num(ct) == NFPROTO_IPV4 ? 4 : 16); + return; + case NFT_CT_PROTOCOL: + dest->data[0] = nf_ct_protonum(ct); + return; + case NFT_CT_PROTO_SRC: + dest->data[0] = (__force __u16)tuple->src.u.all; + return; + case NFT_CT_PROTO_DST: + dest->data[0] = (__force __u16)tuple->dst.u.all; + return; + } + return; +err: + data[NFT_REG_VERDICT].verdict = NFT_BREAK; +} + +static const struct nla_policy nft_ct_policy[NFTA_CT_MAX + 1] = { + [NFTA_CT_DREG] = { .type = NLA_U32 }, + [NFTA_CT_KEY] = { .type = NLA_U32 }, + [NFTA_CT_DIRECTION] = { .type = NLA_U8 }, +}; + +static int nft_ct_init(const struct nft_ctx *ctx, + const struct nft_expr *expr, + const struct nlattr * const tb[]) +{ + struct nft_ct *priv = nft_expr_priv(expr); + int err; + + if (tb[NFTA_CT_DREG] == NULL || + tb[NFTA_CT_KEY] == NULL) + return -EINVAL; + + priv->key = ntohl(nla_get_be32(tb[NFTA_CT_KEY])); + if (tb[NFTA_CT_DIRECTION] != NULL) { + priv->dir = nla_get_u8(tb[NFTA_CT_DIRECTION]); + switch (priv->dir) { + case IP_CT_DIR_ORIGINAL: + case IP_CT_DIR_REPLY: + break; + default: + return -EINVAL; + } + } + + switch (priv->key) { + case NFT_CT_STATE: + case NFT_CT_DIRECTION: + case NFT_CT_STATUS: +#ifdef CONFIG_NF_CONNTRACK_MARK + case NFT_CT_MARK: +#endif +#ifdef CONFIG_NF_CONNTRACK_SECMARK + case NFT_CT_SECMARK: +#endif + case NFT_CT_EXPIRATION: + case NFT_CT_HELPER: + if (tb[NFTA_CT_DIRECTION] != NULL) + return -EINVAL; + break; + case NFT_CT_PROTOCOL: + case NFT_CT_SRC: + case NFT_CT_DST: + case NFT_CT_PROTO_SRC: + case NFT_CT_PROTO_DST: + if (tb[NFTA_CT_DIRECTION] == NULL) + return -EINVAL; + break; + default: + return -EOPNOTSUPP; + } + + err = nf_ct_l3proto_try_module_get(ctx->afi->family); + if (err < 0) + return err; + priv->family = ctx->afi->family; + + priv->dreg = ntohl(nla_get_be32(tb[NFTA_CT_DREG])); + err = nft_validate_output_register(priv->dreg); + if (err < 0) + goto err1; + + err = nft_validate_data_load(ctx, priv->dreg, NULL, NFT_DATA_VALUE); + if (err < 0) + goto err1; + return 0; + +err1: + nf_ct_l3proto_module_put(ctx->afi->family); + return err; +} + +static void nft_ct_destroy(const struct nft_expr *expr) +{ + struct nft_ct *priv = nft_expr_priv(expr); + + nf_ct_l3proto_module_put(priv->family); +} + +static int nft_ct_dump(struct sk_buff *skb, const struct nft_expr *expr) +{ + const struct nft_ct *priv = nft_expr_priv(expr); + + if (nla_put_be32(skb, NFTA_CT_DREG, htonl(priv->dreg))) + goto nla_put_failure; + if (nla_put_be32(skb, NFTA_CT_KEY, htonl(priv->key))) + goto nla_put_failure; + if (nla_put_u8(skb, NFTA_CT_DIRECTION, priv->dir)) + goto nla_put_failure; + return 0; + +nla_put_failure: + return -1; +} + +static struct nft_expr_ops nft_ct_ops __read_mostly = { + .name = "ct", + .size = NFT_EXPR_SIZE(sizeof(struct nft_ct)), + .owner = THIS_MODULE, + .eval = nft_ct_eval, + .init = nft_ct_init, + .destroy = nft_ct_destroy, + .dump = nft_ct_dump, + .policy = nft_ct_policy, + .maxattr = NFTA_CT_MAX, +}; + +static int __init nft_ct_module_init(void) +{ + return nft_register_expr(&nft_ct_ops); +} + +static void __exit nft_ct_module_exit(void) +{ + nft_unregister_expr(&nft_ct_ops); +} + +module_init(nft_ct_module_init); +module_exit(nft_ct_module_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); +MODULE_ALIAS_NFT_EXPR("ct"); diff --git a/net/netfilter/nft_expr_template.c b/net/netfilter/nft_expr_template.c new file mode 100644 index 000000000000..9fc8eb308193 --- /dev/null +++ b/net/netfilter/nft_expr_template.c @@ -0,0 +1,88 @@ +/* + * Copyright (c) 2008 Patrick McHardy <kaber@trash.net> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * Development of this code funded by Astaro AG (http://www.astaro.com/) + */ + +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/netlink.h> +#include <linux/netfilter.h> +#include <linux/netfilter/nf_tables.h> +#include <net/netfilter/nf_tables.h> + +struct nft_template { + +}; + +static void nft_template_eval(const struct nft_expr *expr, + struct nft_data data[NFT_REG_MAX + 1], + const struct nft_pktinfo *pkt) +{ + struct nft_template *priv = nft_expr_priv(expr); + +} + +static const struct nla_policy nft_template_policy[NFTA_TEMPLATE_MAX + 1] = { + [NFTA_TEMPLATE_ATTR] = { .type = NLA_U32 }, +}; + +static int nft_template_init(const struct nft_ctx *ctx, + const struct nft_expr *expr, + const struct nlattr *tb[]) +{ + struct nft_template *priv = nft_expr_priv(expr); + + return 0; +} + +static void nft_template_destroy(const struct nft_ctx *ctx, + const struct nft_expr *expr) +{ + struct nft_template *priv = nft_expr_priv(expr); + +} + +static int nft_template_dump(struct sk_buff *skb, const struct nft_expr *expr) +{ + const struct nft_template *priv = nft_expr_priv(expr); + + NLA_PUT_BE32(skb, NFTA_TEMPLATE_ATTR, priv->field); + return 0; + +nla_put_failure: + return -1; +} + +static struct nft_expr_ops template_ops __read_mostly = { + .name = "template", + .size = NFT_EXPR_SIZE(sizeof(struct nft_template)), + .owner = THIS_MODULE, + .eval = nft_template_eval, + .init = nft_template_init, + .destroy = nft_template_destroy, + .dump = nft_template_dump, + .policy = nft_template_policy, + .maxattr = NFTA_TEMPLATE_MAX, +}; + +static int __init nft_template_module_init(void) +{ + return nft_register_expr(&template_ops); +} + +static void __exit nft_template_module_exit(void) +{ + nft_unregister_expr(&template_ops); +} + +module_init(nft_template_module_init); +module_exit(nft_template_module_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); +MODULE_ALIAS_NFT_EXPR("template"); diff --git a/net/netfilter/nft_exthdr.c b/net/netfilter/nft_exthdr.c new file mode 100644 index 000000000000..21c6a6b7b662 --- /dev/null +++ b/net/netfilter/nft_exthdr.c @@ -0,0 +1,127 @@ +/* + * Copyright (c) 2008 Patrick McHardy <kaber@trash.net> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * Development of this code funded by Astaro AG (http://www.astaro.com/) + */ + +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/module.h> +#include <linux/netlink.h> +#include <linux/netfilter.h> +#include <linux/netfilter/nf_tables.h> +#include <net/netfilter/nf_tables.h> +// FIXME: +#include <net/ipv6.h> + +struct nft_exthdr { + u8 type; + u8 offset; + u8 len; + enum nft_registers dreg:8; +}; + +static void nft_exthdr_eval(const struct nft_expr *expr, + struct nft_data data[NFT_REG_MAX + 1], + const struct nft_pktinfo *pkt) +{ + struct nft_exthdr *priv = nft_expr_priv(expr); + struct nft_data *dest = &data[priv->dreg]; + unsigned int offset; + int err; + + err = ipv6_find_hdr(pkt->skb, &offset, priv->type, NULL, NULL); + if (err < 0) + goto err; + offset += priv->offset; + + if (skb_copy_bits(pkt->skb, offset, dest->data, priv->len) < 0) + goto err; + return; +err: + data[NFT_REG_VERDICT].verdict = NFT_BREAK; +} + +static const struct nla_policy nft_exthdr_policy[NFTA_EXTHDR_MAX + 1] = { + [NFTA_EXTHDR_DREG] = { .type = NLA_U32 }, + [NFTA_EXTHDR_TYPE] = { .type = NLA_U8 }, + [NFTA_EXTHDR_OFFSET] = { .type = NLA_U32 }, + [NFTA_EXTHDR_LEN] = { .type = NLA_U32 }, +}; + +static int nft_exthdr_init(const struct nft_ctx *ctx, + const struct nft_expr *expr, + const struct nlattr * const tb[]) +{ + struct nft_exthdr *priv = nft_expr_priv(expr); + int err; + + if (tb[NFTA_EXTHDR_DREG] == NULL || + tb[NFTA_EXTHDR_TYPE] == NULL || + tb[NFTA_EXTHDR_OFFSET] == NULL || + tb[NFTA_EXTHDR_LEN] == NULL) + return -EINVAL; + + priv->type = nla_get_u8(tb[NFTA_EXTHDR_TYPE]); + priv->offset = ntohl(nla_get_be32(tb[NFTA_EXTHDR_OFFSET])); + priv->len = ntohl(nla_get_be32(tb[NFTA_EXTHDR_LEN])); + if (priv->len == 0 || + priv->len > FIELD_SIZEOF(struct nft_data, data)) + return -EINVAL; + + priv->dreg = ntohl(nla_get_be32(tb[NFTA_EXTHDR_DREG])); + err = nft_validate_output_register(priv->dreg); + if (err < 0) + return err; + return nft_validate_data_load(ctx, priv->dreg, NULL, NFT_DATA_VALUE); +} + +static int nft_exthdr_dump(struct sk_buff *skb, const struct nft_expr *expr) +{ + const struct nft_exthdr *priv = nft_expr_priv(expr); + + if (nla_put_be32(skb, NFTA_EXTHDR_DREG, htonl(priv->dreg))) + goto nla_put_failure; + if (nla_put_u8(skb, NFTA_EXTHDR_TYPE, priv->type)) + goto nla_put_failure; + if (nla_put_be32(skb, NFTA_EXTHDR_OFFSET, htonl(priv->offset))) + goto nla_put_failure; + if (nla_put_be32(skb, NFTA_EXTHDR_LEN, htonl(priv->len))) + goto nla_put_failure; + return 0; + +nla_put_failure: + return -1; +} + +static struct nft_expr_ops exthdr_ops __read_mostly = { + .name = "exthdr", + .size = NFT_EXPR_SIZE(sizeof(struct nft_exthdr)), + .owner = THIS_MODULE, + .eval = nft_exthdr_eval, + .init = nft_exthdr_init, + .dump = nft_exthdr_dump, + .policy = nft_exthdr_policy, + .maxattr = NFTA_EXTHDR_MAX, +}; + +static int __init nft_exthdr_module_init(void) +{ + return nft_register_expr(&exthdr_ops); +} + +static void __exit nft_exthdr_module_exit(void) +{ + nft_unregister_expr(&exthdr_ops); +} + +module_init(nft_exthdr_module_init); +module_exit(nft_exthdr_module_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); +MODULE_ALIAS_NFT_EXPR("exthdr"); diff --git a/net/netfilter/nft_hash.c b/net/netfilter/nft_hash.c new file mode 100644 index 000000000000..67cc502881f1 --- /dev/null +++ b/net/netfilter/nft_hash.c @@ -0,0 +1,348 @@ +/* + * Copyright (c) 2008 Patrick McHardy <kaber@trash.net> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * Development of this code funded by Astaro AG (http://www.astaro.com/) + */ + +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/module.h> +#include <linux/list.h> +#include <linux/jhash.h> +#include <linux/netlink.h> +#include <linux/netfilter.h> +#include <linux/netfilter/nf_tables.h> +#include <net/netfilter/nf_tables.h> + +struct nft_hash { + struct hlist_head *hash; + unsigned int hsize; + enum nft_registers sreg:8; + enum nft_registers dreg:8; + u8 klen; + u8 dlen; + u16 flags; +}; + +struct nft_hash_elem { + struct hlist_node hnode; + struct nft_data key; + struct nft_data data[]; +}; + +static u32 nft_hash_rnd __read_mostly; +static bool nft_hash_rnd_initted __read_mostly; + +static unsigned int nft_hash_data(const struct nft_data *data, + unsigned int hsize, unsigned int len) +{ + unsigned int h; + + // FIXME: can we reasonably guarantee the upper bits are fixed? + h = jhash2(data->data, len >> 2, nft_hash_rnd); + return ((u64)h * hsize) >> 32; +} + +static void nft_hash_eval(const struct nft_expr *expr, + struct nft_data data[NFT_REG_MAX + 1], + const struct nft_pktinfo *pkt) +{ + const struct nft_hash *priv = nft_expr_priv(expr); + const struct nft_hash_elem *elem; + const struct nft_data *key = &data[priv->sreg]; + unsigned int h; + + h = nft_hash_data(key, priv->hsize, priv->klen); + hlist_for_each_entry(elem, &priv->hash[h], hnode) { + if (nft_data_cmp(&elem->key, key, priv->klen)) + continue; + if (priv->flags & NFT_HASH_MAP) + nft_data_copy(&data[priv->dreg], elem->data); + return; + } + data[NFT_REG_VERDICT].verdict = NFT_BREAK; +} + +static void nft_hash_elem_destroy(const struct nft_expr *expr, + struct nft_hash_elem *elem) +{ + const struct nft_hash *priv = nft_expr_priv(expr); + + nft_data_uninit(&elem->key, NFT_DATA_VALUE); + if (priv->flags & NFT_HASH_MAP) + nft_data_uninit(elem->data, nft_dreg_to_type(priv->dreg)); + kfree(elem); +} + +static const struct nla_policy nft_he_policy[NFTA_HE_MAX + 1] = { + [NFTA_HE_KEY] = { .type = NLA_NESTED }, + [NFTA_HE_DATA] = { .type = NLA_NESTED }, +}; + +static int nft_hash_elem_init(const struct nft_ctx *ctx, + const struct nft_expr *expr, + const struct nlattr *nla, + struct nft_hash_elem **new) +{ + struct nft_hash *priv = nft_expr_priv(expr); + struct nlattr *tb[NFTA_HE_MAX + 1]; + struct nft_hash_elem *elem; + struct nft_data_desc d1, d2; + unsigned int size; + int err; + + err = nla_parse_nested(tb, NFTA_HE_MAX, nla, nft_he_policy); + if (err < 0) + return err; + + if (tb[NFTA_HE_KEY] == NULL) + return -EINVAL; + size = sizeof(*elem); + + if (priv->flags & NFT_HASH_MAP) { + if (tb[NFTA_HE_DATA] == NULL) + return -EINVAL; + size += sizeof(elem->data[0]); + } else { + if (tb[NFTA_HE_DATA] != NULL) + return -EINVAL; + } + + elem = kzalloc(size, GFP_KERNEL); + if (elem == NULL) + return -ENOMEM; + + err = nft_data_init(ctx, &elem->key, &d1, tb[NFTA_HE_KEY]); + if (err < 0) + goto err1; + err = -EINVAL; + if (d1.type != NFT_DATA_VALUE || d1.len != priv->klen) + goto err2; + + if (tb[NFTA_HE_DATA] != NULL) { + err = nft_data_init(ctx, elem->data, &d2, tb[NFTA_HE_DATA]); + if (err < 0) + goto err2; + err = nft_validate_data_load(ctx, priv->dreg, elem->data, d2.type); + if (err < 0) + goto err3; + } + + *new = elem; + return 0; + +err3: + nft_data_uninit(elem->data, d2.type); +err2: + nft_data_uninit(&elem->key, d1.type); +err1: + kfree(elem); + return err; +} + +static int nft_hash_elem_dump(struct sk_buff *skb, const struct nft_expr *expr, + const struct nft_hash_elem *elem) + +{ + const struct nft_hash *priv = nft_expr_priv(expr); + struct nlattr *nest; + + nest = nla_nest_start(skb, NFTA_LIST_ELEM); + if (nest == NULL) + goto nla_put_failure; + + if (nft_data_dump(skb, NFTA_HE_KEY, &elem->key, + NFT_DATA_VALUE, priv->klen) < 0) + goto nla_put_failure; + + if (priv->flags & NFT_HASH_MAP) { + if (nft_data_dump(skb, NFTA_HE_DATA, elem->data, + NFT_DATA_VALUE, priv->dlen) < 0) + goto nla_put_failure; + } + + nla_nest_end(skb, nest); + return 0; + +nla_put_failure: + return -1; +} + +static void nft_hash_destroy(const struct nft_ctx *ctx, + const struct nft_expr *expr) +{ + const struct nft_hash *priv = nft_expr_priv(expr); + const struct hlist_node *next; + struct nft_hash_elem *elem; + unsigned int i; + + for (i = 0; i < priv->hsize; i++) { + hlist_for_each_entry_safe(elem, next, &priv->hash[i], hnode) { + hlist_del(&elem->hnode); + nft_hash_elem_destroy(expr, elem); + } + } + kfree(priv->hash); +} + +static const struct nla_policy nft_hash_policy[NFTA_HASH_MAX + 1] = { + [NFTA_HASH_FLAGS] = { .type = NLA_U32 }, + [NFTA_HASH_SREG] = { .type = NLA_U32 }, + [NFTA_HASH_DREG] = { .type = NLA_U32 }, + [NFTA_HASH_KLEN] = { .type = NLA_U32 }, + [NFTA_HASH_ELEMENTS] = { .type = NLA_NESTED }, +}; + +static int nft_hash_init(const struct nft_ctx *ctx, const struct nft_expr *expr, + const struct nlattr * const tb[]) +{ + struct nft_hash *priv = nft_expr_priv(expr); + struct nft_hash_elem *elem, *uninitialized_var(new); + const struct nlattr *nla; + unsigned int cnt, i; + unsigned int h; + int err, rem; + + if (unlikely(!nft_hash_rnd_initted)) { + get_random_bytes(&nft_hash_rnd, 4); + nft_hash_rnd_initted = true; + } + + if (tb[NFTA_HASH_SREG] == NULL || + tb[NFTA_HASH_KLEN] == NULL || + tb[NFTA_HASH_ELEMENTS] == NULL) + return -EINVAL; + + if (tb[NFTA_HASH_FLAGS] != NULL) { + priv->flags = ntohl(nla_get_be32(tb[NFTA_HASH_FLAGS])); + if (priv->flags & ~NFT_HASH_MAP) + return -EINVAL; + } + + priv->sreg = ntohl(nla_get_be32(tb[NFTA_HASH_SREG])); + err = nft_validate_input_register(priv->sreg); + if (err < 0) + return err; + + if (tb[NFTA_HASH_DREG] != NULL) { + if (!(priv->flags & NFT_HASH_MAP)) + return -EINVAL; + priv->dreg = ntohl(nla_get_be32(tb[NFTA_HASH_DREG])); + err = nft_validate_output_register(priv->dreg); + if (err < 0) + return err; + } + + priv->klen = ntohl(nla_get_be32(tb[NFTA_HASH_KLEN])); + if (priv->klen == 0) + return -EINVAL; + + cnt = 0; + nla_for_each_nested(nla, tb[NFTA_HASH_ELEMENTS], rem) { + if (nla_type(nla) != NFTA_LIST_ELEM) + return -EINVAL; + cnt++; + } + + /* Aim for a load factor of 0.75 */ + cnt = cnt * 4 / 3; + + priv->hash = kcalloc(cnt, sizeof(struct hlist_head), GFP_KERNEL); + if (priv->hash == NULL) + return -ENOMEM; + priv->hsize = cnt; + + for (i = 0; i < cnt; i++) + INIT_HLIST_HEAD(&priv->hash[i]); + + err = -ENOMEM; + nla_for_each_nested(nla, tb[NFTA_HASH_ELEMENTS], rem) { + err = nft_hash_elem_init(ctx, expr, nla, &new); + if (err < 0) + goto err1; + + h = nft_hash_data(&new->key, priv->hsize, priv->klen); + hlist_for_each_entry(elem, &priv->hash[h], hnode) { + if (nft_data_cmp(&elem->key, &new->key, priv->klen)) + continue; + nft_hash_elem_destroy(expr, new); + err = -EEXIST; + goto err1; + } + hlist_add_head(&new->hnode, &priv->hash[h]); + } + return 0; + +err1: + nft_hash_destroy(ctx, expr); + return err; +} + +static int nft_hash_dump(struct sk_buff *skb, const struct nft_expr *expr) +{ + const struct nft_hash *priv = nft_expr_priv(expr); + const struct nft_hash_elem *elem; + struct nlattr *list; + unsigned int i; + + if (priv->flags) + if (nla_put_be32(skb, NFTA_HASH_FLAGS, htonl(priv->flags))) + goto nla_put_failure; + if (nla_put_be32(skb, NFTA_HASH_SREG, htonl(priv->sreg))) + goto nla_put_failure; + if (priv->flags & NFT_HASH_MAP) + if (nla_put_be32(skb, NFTA_HASH_DREG, htonl(priv->dreg))) + goto nla_put_failure; + if (nla_put_be32(skb, NFTA_HASH_KLEN, htonl(priv->klen))) + goto nla_put_failure; + + list = nla_nest_start(skb, NFTA_HASH_ELEMENTS); + if (list == NULL) + goto nla_put_failure; + + for (i = 0; i < priv->hsize; i++) { + hlist_for_each_entry(elem, &priv->hash[i], hnode) { + if (nft_hash_elem_dump(skb, expr, elem) < 0) + goto nla_put_failure; + } + } + + nla_nest_end(skb, list); + return 0; + +nla_put_failure: + return -1; +} + +static struct nft_expr_ops nft_hash_ops __read_mostly = { + .name = "hash", + .size = NFT_EXPR_SIZE(sizeof(struct nft_hash)), + .owner = THIS_MODULE, + .eval = nft_hash_eval, + .init = nft_hash_init, + .destroy = nft_hash_destroy, + .dump = nft_hash_dump, + .policy = nft_hash_policy, + .maxattr = NFTA_HASH_MAX, +}; + +static int __init nft_hash_module_init(void) +{ + return nft_register_expr(&nft_hash_ops); +} + +static void __exit nft_hash_module_exit(void) +{ + nft_unregister_expr(&nft_hash_ops); +} + +module_init(nft_hash_module_init); +module_exit(nft_hash_module_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); +MODULE_ALIAS_NFT_EXPR("hash"); diff --git a/net/netfilter/nft_immediate.c b/net/netfilter/nft_immediate.c new file mode 100644 index 000000000000..3bf42c3cc49a --- /dev/null +++ b/net/netfilter/nft_immediate.c @@ -0,0 +1,113 @@ +/* + * Copyright (c) 2008 Patrick McHardy <kaber@trash.net> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * Development of this code funded by Astaro AG (http://www.astaro.com/) + */ + +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/module.h> +#include <linux/netlink.h> +#include <linux/netfilter.h> +#include <linux/netfilter/nf_tables.h> +#include <net/netfilter/nf_tables_core.h> +#include <net/netfilter/nf_tables.h> + +struct nft_immediate_expr { + struct nft_data data; + enum nft_registers dreg:8; + u8 dlen; +}; + +static void nft_immediate_eval(const struct nft_expr *expr, + struct nft_data data[NFT_REG_MAX + 1], + const struct nft_pktinfo *pkt) +{ + const struct nft_immediate_expr *priv = nft_expr_priv(expr); + + nft_data_copy(&data[priv->dreg], &priv->data); +} + +static const struct nla_policy nft_immediate_policy[NFTA_IMMEDIATE_MAX + 1] = { + [NFTA_IMMEDIATE_DREG] = { .type = NLA_U32 }, + [NFTA_IMMEDIATE_DATA] = { .type = NLA_NESTED }, +}; + +static int nft_immediate_init(const struct nft_ctx *ctx, + const struct nft_expr *expr, + const struct nlattr * const tb[]) +{ + struct nft_immediate_expr *priv = nft_expr_priv(expr); + struct nft_data_desc desc; + int err; + + if (tb[NFTA_IMMEDIATE_DREG] == NULL || + tb[NFTA_IMMEDIATE_DATA] == NULL) + return -EINVAL; + + priv->dreg = ntohl(nla_get_be32(tb[NFTA_IMMEDIATE_DREG])); + err = nft_validate_output_register(priv->dreg); + if (err < 0) + return err; + + err = nft_data_init(ctx, &priv->data, &desc, tb[NFTA_IMMEDIATE_DATA]); + if (err < 0) + return err; + priv->dlen = desc.len; + + err = nft_validate_data_load(ctx, priv->dreg, &priv->data, desc.type); + if (err < 0) + goto err1; + + return 0; + +err1: + nft_data_uninit(&priv->data, desc.type); + return err; +} + +static void nft_immediate_destroy(const struct nft_expr *expr) +{ + const struct nft_immediate_expr *priv = nft_expr_priv(expr); + return nft_data_uninit(&priv->data, nft_dreg_to_type(priv->dreg)); +} + +static int nft_immediate_dump(struct sk_buff *skb, const struct nft_expr *expr) +{ + const struct nft_immediate_expr *priv = nft_expr_priv(expr); + + if (nla_put_be32(skb, NFTA_IMMEDIATE_DREG, htonl(priv->dreg))) + goto nla_put_failure; + + return nft_data_dump(skb, NFTA_IMMEDIATE_DATA, &priv->data, + nft_dreg_to_type(priv->dreg), priv->dlen); + +nla_put_failure: + return -1; +} + +static struct nft_expr_ops nft_imm_ops __read_mostly = { + .name = "immediate", + .size = NFT_EXPR_SIZE(sizeof(struct nft_immediate_expr)), + .owner = THIS_MODULE, + .eval = nft_immediate_eval, + .init = nft_immediate_init, + .destroy = nft_immediate_destroy, + .dump = nft_immediate_dump, + .policy = nft_immediate_policy, + .maxattr = NFTA_IMMEDIATE_MAX, +}; + +int __init nft_immediate_module_init(void) +{ + return nft_register_expr(&nft_imm_ops); +} + +void nft_immediate_module_exit(void) +{ + nft_unregister_expr(&nft_imm_ops); +} diff --git a/net/netfilter/nft_limit.c b/net/netfilter/nft_limit.c new file mode 100644 index 000000000000..e0e3fc8aebc3 --- /dev/null +++ b/net/netfilter/nft_limit.c @@ -0,0 +1,113 @@ +/* + * Copyright (c) 2008 Patrick McHardy <kaber@trash.net> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * Development of this code funded by Astaro AG (http://www.astaro.com/) + */ + +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/module.h> +#include <linux/spinlock.h> +#include <linux/netlink.h> +#include <linux/netfilter.h> +#include <linux/netfilter/nf_tables.h> +#include <net/netfilter/nf_tables.h> + +static DEFINE_SPINLOCK(limit_lock); + +struct nft_limit { + u64 tokens; + u64 rate; + u64 unit; + unsigned long stamp; +}; + +static void nft_limit_eval(const struct nft_expr *expr, + struct nft_data data[NFT_REG_MAX + 1], + const struct nft_pktinfo *pkt) +{ + struct nft_limit *priv = nft_expr_priv(expr); + + spin_lock_bh(&limit_lock); + if (time_after_eq(jiffies, priv->stamp)) { + priv->tokens = priv->rate; + priv->stamp = jiffies + priv->unit * HZ; + } + + if (priv->tokens >= 1) { + priv->tokens--; + spin_unlock_bh(&limit_lock); + return; + } + spin_unlock_bh(&limit_lock); + + data[NFT_REG_VERDICT].verdict = NFT_BREAK; +} + +static const struct nla_policy nft_limit_policy[NFTA_LIMIT_MAX + 1] = { + [NFTA_LIMIT_RATE] = { .type = NLA_U64 }, + [NFTA_LIMIT_UNIT] = { .type = NLA_U64 }, +}; + +static int nft_limit_init(const struct nft_ctx *ctx, + const struct nft_expr *expr, + const struct nlattr * const tb[]) +{ + struct nft_limit *priv = nft_expr_priv(expr); + + if (tb[NFTA_LIMIT_RATE] == NULL || + tb[NFTA_LIMIT_UNIT] == NULL) + return -EINVAL; + + priv->rate = be64_to_cpu(nla_get_be64(tb[NFTA_LIMIT_RATE])); + priv->unit = be64_to_cpu(nla_get_be64(tb[NFTA_LIMIT_UNIT])); + priv->stamp = jiffies + priv->unit * HZ; + priv->tokens = priv->rate; + return 0; +} + +static int nft_limit_dump(struct sk_buff *skb, const struct nft_expr *expr) +{ + const struct nft_limit *priv = nft_expr_priv(expr); + + if (nla_put_be64(skb, NFTA_LIMIT_RATE, cpu_to_be64(priv->rate))) + goto nla_put_failure; + if (nla_put_be64(skb, NFTA_LIMIT_UNIT, cpu_to_be64(priv->unit))) + goto nla_put_failure; + return 0; + +nla_put_failure: + return -1; +} + +static struct nft_expr_ops nft_limit_ops __read_mostly = { + .name = "limit", + .size = NFT_EXPR_SIZE(sizeof(struct nft_limit)), + .owner = THIS_MODULE, + .eval = nft_limit_eval, + .init = nft_limit_init, + .dump = nft_limit_dump, + .policy = nft_limit_policy, + .maxattr = NFTA_LIMIT_MAX, +}; + +static int __init nft_limit_module_init(void) +{ + return nft_register_expr(&nft_limit_ops); +} + +static void __exit nft_limit_module_exit(void) +{ + nft_unregister_expr(&nft_limit_ops); +} + +module_init(nft_limit_module_init); +module_exit(nft_limit_module_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); +MODULE_ALIAS_NFT_EXPR("limit"); diff --git a/net/netfilter/nft_log.c b/net/netfilter/nft_log.c new file mode 100644 index 000000000000..da495c3b1e7e --- /dev/null +++ b/net/netfilter/nft_log.c @@ -0,0 +1,140 @@ +/* + * Copyright (c) 2008 Patrick McHardy <kaber@trash.net> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * Development of this code funded by Astaro AG (http://www.astaro.com/) + */ + +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/module.h> +#include <linux/netlink.h> +#include <linux/netfilter.h> +#include <linux/netfilter/nf_tables.h> +#include <net/netfilter/nf_tables.h> +#include <net/netfilter/nf_log.h> +#include <linux/netdevice.h> + +static const char *nft_log_null_prefix = ""; + +struct nft_log { + struct nf_loginfo loginfo; + char *prefix; + int family; +}; + +static void nft_log_eval(const struct nft_expr *expr, + struct nft_data data[NFT_REG_MAX + 1], + const struct nft_pktinfo *pkt) +{ + const struct nft_log *priv = nft_expr_priv(expr); + struct net *net = dev_net(pkt->in ? pkt->in : pkt->out); + + nf_log_packet(net, priv->family, pkt->hooknum, pkt->skb, pkt->in, + pkt->out, &priv->loginfo, "%s", priv->prefix); +} + +static const struct nla_policy nft_log_policy[NFTA_LOG_MAX + 1] = { + [NFTA_LOG_GROUP] = { .type = NLA_U16 }, + [NFTA_LOG_PREFIX] = { .type = NLA_STRING }, + [NFTA_LOG_SNAPLEN] = { .type = NLA_U32 }, + [NFTA_LOG_QTHRESHOLD] = { .type = NLA_U16 }, +}; + +static int nft_log_init(const struct nft_ctx *ctx, + const struct nft_expr *expr, + const struct nlattr * const tb[]) +{ + struct nft_log *priv = nft_expr_priv(expr); + struct nf_loginfo *li = &priv->loginfo; + const struct nlattr *nla; + + priv->family = ctx->afi->family; + + nla = tb[NFTA_LOG_PREFIX]; + if (nla != NULL) { + priv->prefix = kmalloc(nla_len(nla) + 1, GFP_KERNEL); + if (priv->prefix == NULL) + return -ENOMEM; + nla_strlcpy(priv->prefix, nla, nla_len(nla) + 1); + } else + priv->prefix = (char *)nft_log_null_prefix; + + li->type = NF_LOG_TYPE_ULOG; + if (tb[NFTA_LOG_GROUP] != NULL) + li->u.ulog.group = ntohs(nla_get_be16(tb[NFTA_LOG_GROUP])); + + if (tb[NFTA_LOG_SNAPLEN] != NULL) + li->u.ulog.copy_len = ntohl(nla_get_be32(tb[NFTA_LOG_SNAPLEN])); + if (tb[NFTA_LOG_QTHRESHOLD] != NULL) { + li->u.ulog.qthreshold = + ntohs(nla_get_be16(tb[NFTA_LOG_QTHRESHOLD])); + } + + return 0; +} + +static void nft_log_destroy(const struct nft_expr *expr) +{ + struct nft_log *priv = nft_expr_priv(expr); + + if (priv->prefix != nft_log_null_prefix) + kfree(priv->prefix); +} + +static int nft_log_dump(struct sk_buff *skb, const struct nft_expr *expr) +{ + const struct nft_log *priv = nft_expr_priv(expr); + const struct nf_loginfo *li = &priv->loginfo; + + if (priv->prefix != nft_log_null_prefix) + if (nla_put_string(skb, NFTA_LOG_PREFIX, priv->prefix)) + goto nla_put_failure; + if (li->u.ulog.group) + if (nla_put_be16(skb, NFTA_LOG_GROUP, htons(li->u.ulog.group))) + goto nla_put_failure; + if (li->u.ulog.copy_len) + if (nla_put_be32(skb, NFTA_LOG_SNAPLEN, + htonl(li->u.ulog.copy_len))) + goto nla_put_failure; + if (li->u.ulog.qthreshold) + if (nla_put_be16(skb, NFTA_LOG_QTHRESHOLD, + htons(li->u.ulog.qthreshold))) + goto nla_put_failure; + return 0; + +nla_put_failure: + return -1; +} + +static struct nft_expr_ops nft_log_ops __read_mostly = { + .name = "log", + .size = NFT_EXPR_SIZE(sizeof(struct nft_log)), + .owner = THIS_MODULE, + .eval = nft_log_eval, + .init = nft_log_init, + .destroy = nft_log_destroy, + .dump = nft_log_dump, + .policy = nft_log_policy, + .maxattr = NFTA_LOG_MAX, +}; + +static int __init nft_log_module_init(void) +{ + return nft_register_expr(&nft_log_ops); +} + +static void __exit nft_log_module_exit(void) +{ + nft_unregister_expr(&nft_log_ops); +} + +module_init(nft_log_module_init); +module_exit(nft_log_module_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); +MODULE_ALIAS_NFT_EXPR("log"); diff --git a/net/netfilter/nft_meta.c b/net/netfilter/nft_meta.c new file mode 100644 index 000000000000..96735aa2f039 --- /dev/null +++ b/net/netfilter/nft_meta.c @@ -0,0 +1,222 @@ +/* + * Copyright (c) 2008 Patrick McHardy <kaber@trash.net> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * Development of this code funded by Astaro AG (http://www.astaro.com/) + */ + +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/module.h> +#include <linux/netlink.h> +#include <linux/netfilter.h> +#include <linux/netfilter/nf_tables.h> +#include <net/dst.h> +#include <net/sock.h> +#include <net/tcp_states.h> /* for TCP_TIME_WAIT */ +#include <net/netfilter/nf_tables.h> + +struct nft_meta { + enum nft_meta_keys key:8; + enum nft_registers dreg:8; +}; + +static void nft_meta_eval(const struct nft_expr *expr, + struct nft_data data[NFT_REG_MAX + 1], + const struct nft_pktinfo *pkt) +{ + const struct nft_meta *priv = nft_expr_priv(expr); + const struct sk_buff *skb = pkt->skb; + const struct net_device *in = pkt->in, *out = pkt->out; + struct nft_data *dest = &data[priv->dreg]; + + switch (priv->key) { + case NFT_META_LEN: + dest->data[0] = skb->len; + break; + case NFT_META_PROTOCOL: + *(__be16 *)dest->data = skb->protocol; + break; + case NFT_META_PRIORITY: + dest->data[0] = skb->priority; + break; + case NFT_META_MARK: + dest->data[0] = skb->mark; + break; + case NFT_META_IIF: + if (in == NULL) + goto err; + dest->data[0] = in->ifindex; + break; + case NFT_META_OIF: + if (out == NULL) + goto err; + dest->data[0] = out->ifindex; + break; + case NFT_META_IIFNAME: + if (in == NULL) + goto err; + strncpy((char *)dest->data, in->name, sizeof(dest->data)); + break; + case NFT_META_OIFNAME: + if (out == NULL) + goto err; + strncpy((char *)dest->data, out->name, sizeof(dest->data)); + break; + case NFT_META_IIFTYPE: + if (in == NULL) + goto err; + *(u16 *)dest->data = in->type; + break; + case NFT_META_OIFTYPE: + if (out == NULL) + goto err; + *(u16 *)dest->data = out->type; + break; + case NFT_META_SKUID: + if (skb->sk == NULL || skb->sk->sk_state == TCP_TIME_WAIT) + goto err; + + read_lock_bh(&skb->sk->sk_callback_lock); + if (skb->sk->sk_socket == NULL || + skb->sk->sk_socket->file == NULL) { + read_unlock_bh(&skb->sk->sk_callback_lock); + goto err; + } + + dest->data[0] = + from_kuid_munged(&init_user_ns, + skb->sk->sk_socket->file->f_cred->fsuid); + read_unlock_bh(&skb->sk->sk_callback_lock); + break; + case NFT_META_SKGID: + if (skb->sk == NULL || skb->sk->sk_state == TCP_TIME_WAIT) + goto err; + + read_lock_bh(&skb->sk->sk_callback_lock); + if (skb->sk->sk_socket == NULL || + skb->sk->sk_socket->file == NULL) { + read_unlock_bh(&skb->sk->sk_callback_lock); + goto err; + } + dest->data[0] = + from_kgid_munged(&init_user_ns, + skb->sk->sk_socket->file->f_cred->fsgid); + read_unlock_bh(&skb->sk->sk_callback_lock); + break; +#ifdef CONFIG_NET_CLS_ROUTE + case NFT_META_RTCLASSID: { + const struct dst_entry *dst = skb_dst(skb); + + if (dst == NULL) + goto err; + dest->data[0] = dst->tclassid; + break; + } +#endif +#ifdef CONFIG_NETWORK_SECMARK + case NFT_META_SECMARK: + dest->data[0] = skb->secmark; + break; +#endif + default: + WARN_ON(1); + goto err; + } + return; + +err: + data[NFT_REG_VERDICT].verdict = NFT_BREAK; +} + +static const struct nla_policy nft_meta_policy[NFTA_META_MAX + 1] = { + [NFTA_META_DREG] = { .type = NLA_U32 }, + [NFTA_META_KEY] = { .type = NLA_U32 }, +}; + +static int nft_meta_init(const struct nft_ctx *ctx, const struct nft_expr *expr, + const struct nlattr * const tb[]) +{ + struct nft_meta *priv = nft_expr_priv(expr); + int err; + + if (tb[NFTA_META_DREG] == NULL || + tb[NFTA_META_KEY] == NULL) + return -EINVAL; + + priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY])); + switch (priv->key) { + case NFT_META_LEN: + case NFT_META_PROTOCOL: + case NFT_META_PRIORITY: + case NFT_META_MARK: + case NFT_META_IIF: + case NFT_META_OIF: + case NFT_META_IIFNAME: + case NFT_META_OIFNAME: + case NFT_META_IIFTYPE: + case NFT_META_OIFTYPE: + case NFT_META_SKUID: + case NFT_META_SKGID: +#ifdef CONFIG_NET_CLS_ROUTE + case NFT_META_RTCLASSID: +#endif +#ifdef CONFIG_NETWORK_SECMARK + case NFT_META_SECMARK: +#endif + break; + default: + return -EOPNOTSUPP; + } + + priv->dreg = ntohl(nla_get_be32(tb[NFTA_META_DREG])); + err = nft_validate_output_register(priv->dreg); + if (err < 0) + return err; + return nft_validate_data_load(ctx, priv->dreg, NULL, NFT_DATA_VALUE); +} + +static int nft_meta_dump(struct sk_buff *skb, const struct nft_expr *expr) +{ + const struct nft_meta *priv = nft_expr_priv(expr); + + if (nla_put_be32(skb, NFTA_META_DREG, htonl(priv->dreg))) + goto nla_put_failure; + if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key))) + goto nla_put_failure; + return 0; + +nla_put_failure: + return -1; +} + +static struct nft_expr_ops nft_meta_ops __read_mostly = { + .name = "meta", + .size = NFT_EXPR_SIZE(sizeof(struct nft_meta)), + .owner = THIS_MODULE, + .eval = nft_meta_eval, + .init = nft_meta_init, + .dump = nft_meta_dump, + .policy = nft_meta_policy, + .maxattr = NFTA_META_MAX, +}; + +static int __init nft_meta_module_init(void) +{ + return nft_register_expr(&nft_meta_ops); +} + +static void __exit nft_meta_module_exit(void) +{ + nft_unregister_expr(&nft_meta_ops); +} + +module_init(nft_meta_module_init); +module_exit(nft_meta_module_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); +MODULE_ALIAS_NFT_EXPR("meta"); diff --git a/net/netfilter/nft_meta_target.c b/net/netfilter/nft_meta_target.c new file mode 100644 index 000000000000..71177df75ffb --- /dev/null +++ b/net/netfilter/nft_meta_target.c @@ -0,0 +1,117 @@ +/* + * Copyright (c) 2008 Patrick McHardy <kaber@trash.net> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * Development of this code funded by Astaro AG (http://www.astaro.com/) + */ + +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/list.h> +#include <linux/rbtree.h> +#include <linux/netlink.h> +#include <linux/netfilter.h> +#include <linux/netfilter/nf_tables.h> +#include <net/netfilter/nf_tables.h> + +struct nft_meta { + enum nft_meta_keys key; +}; + +static void nft_meta_eval(const struct nft_expr *expr, + struct nft_data *nfres, + struct nft_data *data, + const struct nft_pktinfo *pkt) +{ + const struct nft_meta *meta = nft_expr_priv(expr); + struct sk_buff *skb = pkt->skb; + u32 val = data->data[0]; + + switch (meta->key) { + case NFT_META_MARK: + skb->mark = val; + break; + case NFT_META_PRIORITY: + skb->priority = val; + break; + case NFT_META_NFTRACE: + skb->nf_trace = val; + break; +#ifdef CONFIG_NETWORK_SECMARK + case NFT_META_SECMARK: + skb->secmark = val; + break; +#endif + default: + WARN_ON(1); + } +} + +static const struct nla_policy nft_meta_policy[NFTA_META_MAX + 1] = { + [NFTA_META_KEY] = { .type = NLA_U32 }, +}; + +static int nft_meta_init(const struct nft_expr *expr, struct nlattr *tb[]) +{ + struct nft_meta *meta = nft_expr_priv(expr); + + if (tb[NFTA_META_KEY] == NULL) + return -EINVAL; + + meta->key = ntohl(nla_get_be32(tb[NFTA_META_KEY])); + switch (meta->key) { + case NFT_META_MARK: + case NFT_META_PRIORITY: + case NFT_META_NFTRACE: +#ifdef CONFIG_NETWORK_SECMARK + case NFT_META_SECMARK: +#endif + break; + default: + return -EINVAL; + } + + return 0; +} + +static int nft_meta_dump(struct sk_buff *skb, const struct nft_expr *expr) +{ + struct nft_meta *meta = nft_expr_priv(expr); + + NLA_PUT_BE32(skb, NFTA_META_KEY, htonl(meta->key)); + return 0; + +nla_put_failure: + return -1; +} + +static struct nft_expr_ops meta_target __read_mostly = { + .name = "meta", + .size = NFT_EXPR_SIZE(sizeof(struct nft_meta)), + .owner = THIS_MODULE, + .eval = nft_meta_eval, + .init = nft_meta_init, + .dump = nft_meta_dump, + .policy = nft_meta_policy, + .maxattr = NFTA_META_MAX, +}; + +static int __init nft_meta_target_init(void) +{ + return nft_register_expr(&meta_target); +} + +static void __exit nft_meta_target_exit(void) +{ + nft_unregister_expr(&meta_target); +} + +module_init(nft_meta_target_init); +module_exit(nft_meta_target_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); +MODULE_ALIAS_NFT_EXPR("meta"); diff --git a/net/netfilter/nft_payload.c b/net/netfilter/nft_payload.c new file mode 100644 index 000000000000..329f134b3f89 --- /dev/null +++ b/net/netfilter/nft_payload.c @@ -0,0 +1,137 @@ +/* + * Copyright (c) 2008 Patrick McHardy <kaber@trash.net> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * Development of this code funded by Astaro AG (http://www.astaro.com/) + */ + +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/module.h> +#include <linux/netlink.h> +#include <linux/netfilter.h> +#include <linux/netfilter/nf_tables.h> +#include <net/netfilter/nf_tables_core.h> +#include <net/netfilter/nf_tables.h> + +struct nft_payload { + enum nft_payload_bases base:8; + u8 offset; + u8 len; + enum nft_registers dreg:8; +}; + +static void nft_payload_eval(const struct nft_expr *expr, + struct nft_data data[NFT_REG_MAX + 1], + const struct nft_pktinfo *pkt) +{ + const struct nft_payload *priv = nft_expr_priv(expr); + const struct sk_buff *skb = pkt->skb; + struct nft_data *dest = &data[priv->dreg]; + int offset; + + switch (priv->base) { + case NFT_PAYLOAD_LL_HEADER: + if (!skb_mac_header_was_set(skb)) + goto err; + offset = skb_mac_header(skb) - skb->data; + break; + case NFT_PAYLOAD_NETWORK_HEADER: + offset = skb_network_offset(skb); + break; + case NFT_PAYLOAD_TRANSPORT_HEADER: + offset = skb_transport_offset(skb); + break; + default: + BUG(); + } + offset += priv->offset; + + if (skb_copy_bits(skb, offset, dest->data, priv->len) < 0) + goto err; + return; +err: + data[NFT_REG_VERDICT].verdict = NFT_BREAK; +} + +static const struct nla_policy nft_payload_policy[NFTA_PAYLOAD_MAX + 1] = { + [NFTA_PAYLOAD_DREG] = { .type = NLA_U32 }, + [NFTA_PAYLOAD_BASE] = { .type = NLA_U32 }, + [NFTA_PAYLOAD_OFFSET] = { .type = NLA_U32 }, + [NFTA_PAYLOAD_LEN] = { .type = NLA_U32 }, +}; + +static int nft_payload_init(const struct nft_ctx *ctx, + const struct nft_expr *expr, + const struct nlattr * const tb[]) +{ + struct nft_payload *priv = nft_expr_priv(expr); + int err; + + if (tb[NFTA_PAYLOAD_DREG] == NULL || + tb[NFTA_PAYLOAD_BASE] == NULL || + tb[NFTA_PAYLOAD_OFFSET] == NULL || + tb[NFTA_PAYLOAD_LEN] == NULL) + return -EINVAL; + + priv->base = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_BASE])); + switch (priv->base) { + case NFT_PAYLOAD_LL_HEADER: + case NFT_PAYLOAD_NETWORK_HEADER: + case NFT_PAYLOAD_TRANSPORT_HEADER: + break; + default: + return -EOPNOTSUPP; + } + + priv->offset = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_OFFSET])); + priv->len = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_LEN])); + if (priv->len == 0 || + priv->len > FIELD_SIZEOF(struct nft_data, data)) + return -EINVAL; + + priv->dreg = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_DREG])); + err = nft_validate_output_register(priv->dreg); + if (err < 0) + return err; + return nft_validate_data_load(ctx, priv->dreg, NULL, NFT_DATA_VALUE); +} + +static int nft_payload_dump(struct sk_buff *skb, const struct nft_expr *expr) +{ + const struct nft_payload *priv = nft_expr_priv(expr); + + if (nla_put_be32(skb, NFTA_PAYLOAD_DREG, htonl(priv->dreg)) || + nla_put_be32(skb, NFTA_PAYLOAD_BASE, htonl(priv->base)) || + nla_put_be32(skb, NFTA_PAYLOAD_OFFSET, htonl(priv->offset)) || + nla_put_be32(skb, NFTA_PAYLOAD_LEN, htonl(priv->len))) + goto nla_put_failure; + return 0; + +nla_put_failure: + return -1; +} + +static struct nft_expr_ops nft_payload_ops __read_mostly = { + .name = "payload", + .size = NFT_EXPR_SIZE(sizeof(struct nft_payload)), + .owner = THIS_MODULE, + .eval = nft_payload_eval, + .init = nft_payload_init, + .dump = nft_payload_dump, + .policy = nft_payload_policy, + .maxattr = NFTA_PAYLOAD_MAX, +}; + +int __init nft_payload_module_init(void) +{ + return nft_register_expr(&nft_payload_ops); +} + +void nft_payload_module_exit(void) +{ + nft_unregister_expr(&nft_payload_ops); +} diff --git a/net/netfilter/nft_set.c b/net/netfilter/nft_set.c new file mode 100644 index 000000000000..7b7c8354c327 --- /dev/null +++ b/net/netfilter/nft_set.c @@ -0,0 +1,381 @@ +/* + * Copyright (c) 2008 Patrick McHardy <kaber@trash.net> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * Development of this code funded by Astaro AG (http://www.astaro.com/) + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/list.h> +#include <linux/rbtree.h> +#include <linux/netlink.h> +#include <linux/netfilter.h> +#include <linux/netfilter/nf_tables.h> +#include <net/netfilter/nf_tables.h> + +struct nft_set { + struct rb_root root; + enum nft_registers sreg:8; + enum nft_registers dreg:8; + u8 klen; + u8 dlen; + u16 flags; +}; + +struct nft_set_elem { + struct rb_node node; + enum nft_set_elem_flags flags; + struct nft_data key; + struct nft_data data[]; +}; + +static void nft_set_eval(const struct nft_expr *expr, + struct nft_data data[NFT_REG_MAX + 1], + const struct nft_pktinfo *pkt) +{ + const struct nft_set *priv = nft_expr_priv(expr); + const struct rb_node *parent = priv->root.rb_node; + const struct nft_set_elem *elem, *interval = NULL; + const struct nft_data *key = &data[priv->sreg]; + int d; + + while (parent != NULL) { + elem = rb_entry(parent, struct nft_set_elem, node); + + d = nft_data_cmp(&elem->key, key, priv->klen); + if (d < 0) { + parent = parent->rb_left; + interval = elem; + } else if (d > 0) + parent = parent->rb_right; + else { +found: + if (elem->flags & NFT_SE_INTERVAL_END) + goto out; + if (priv->flags & NFT_SET_MAP) + nft_data_copy(&data[priv->dreg], elem->data); + return; + } + } + + if (priv->flags & NFT_SET_INTERVAL && interval != NULL) { + elem = interval; + goto found; + } +out: + data[NFT_REG_VERDICT].verdict = NFT_BREAK; +} + +static void nft_set_elem_destroy(const struct nft_expr *expr, + struct nft_set_elem *elem) +{ + const struct nft_set *priv = nft_expr_priv(expr); + + nft_data_uninit(&elem->key, NFT_DATA_VALUE); + if (priv->flags & NFT_SET_MAP) + nft_data_uninit(elem->data, nft_dreg_to_type(priv->dreg)); + kfree(elem); +} + +static const struct nla_policy nft_se_policy[NFTA_SE_MAX + 1] = { + [NFTA_SE_KEY] = { .type = NLA_NESTED }, + [NFTA_SE_DATA] = { .type = NLA_NESTED }, + [NFTA_SE_FLAGS] = { .type = NLA_U32 }, +}; + +static int nft_set_elem_init(const struct nft_ctx *ctx, + const struct nft_expr *expr, + const struct nlattr *nla, + struct nft_set_elem **new) +{ + struct nft_set *priv = nft_expr_priv(expr); + struct nlattr *tb[NFTA_SE_MAX + 1]; + struct nft_set_elem *elem; + struct nft_data_desc d1, d2; + enum nft_set_elem_flags flags = 0; + unsigned int size; + int err; + + err = nla_parse_nested(tb, NFTA_SE_MAX, nla, nft_se_policy); + if (err < 0) + return err; + + if (tb[NFTA_SE_KEY] == NULL) + return -EINVAL; + + if (tb[NFTA_SE_FLAGS] != NULL) { + flags = ntohl(nla_get_be32(tb[NFTA_SE_FLAGS])); + if (flags & ~NFT_SE_INTERVAL_END) + return -EINVAL; + } + + size = sizeof(*elem); + if (priv->flags & NFT_SET_MAP) { + if (tb[NFTA_SE_DATA] == NULL && !(flags & NFT_SE_INTERVAL_END)) + return -EINVAL; + size += sizeof(elem->data[0]); + } else { + if (tb[NFTA_SE_DATA] != NULL) + return -EINVAL; + } + + elem = kzalloc(size, GFP_KERNEL); + if (elem == NULL) + return -ENOMEM; + elem->flags = flags; + + err = nft_data_init(ctx, &elem->key, &d1, tb[NFTA_SE_KEY]); + if (err < 0) + goto err1; + err = -EINVAL; + if (d1.type != NFT_DATA_VALUE || d1.len != priv->klen) + goto err2; + + if (tb[NFTA_SE_DATA] != NULL) { + err = nft_data_init(ctx, elem->data, &d2, tb[NFTA_SE_DATA]); + if (err < 0) + goto err2; + err = -EINVAL; + if (priv->dreg != NFT_REG_VERDICT && d2.len != priv->dlen) + goto err2; + err = nft_validate_data_load(ctx, priv->dreg, elem->data, d2.type); + if (err < 0) + goto err3; + } + + *new = elem; + return 0; + +err3: + nft_data_uninit(elem->data, d2.type); +err2: + nft_data_uninit(&elem->key, d1.type); +err1: + kfree(elem); + return err; +} + +static int nft_set_elem_dump(struct sk_buff *skb, const struct nft_expr *expr, + const struct nft_set_elem *elem) + +{ + const struct nft_set *priv = nft_expr_priv(expr); + struct nlattr *nest; + + nest = nla_nest_start(skb, NFTA_LIST_ELEM); + if (nest == NULL) + goto nla_put_failure; + + if (nft_data_dump(skb, NFTA_SE_KEY, &elem->key, + NFT_DATA_VALUE, priv->klen) < 0) + goto nla_put_failure; + + if (priv->flags & NFT_SET_MAP && !(elem->flags & NFT_SE_INTERVAL_END)) { + if (nft_data_dump(skb, NFTA_SE_DATA, elem->data, + nft_dreg_to_type(priv->dreg), priv->dlen) < 0) + goto nla_put_failure; + } + + if (elem->flags){ + if (nla_put_be32(skb, NFTA_SE_FLAGS, htonl(elem->flags))) + goto nla_put_failure; + } + + nla_nest_end(skb, nest); + return 0; + +nla_put_failure: + return -1; +} + +static void nft_set_destroy(const struct nft_expr *expr) +{ + struct nft_set *priv = nft_expr_priv(expr); + struct nft_set_elem *elem; + struct rb_node *node; + + while ((node = priv->root.rb_node) != NULL) { + rb_erase(node, &priv->root); + elem = rb_entry(node, struct nft_set_elem, node); + nft_set_elem_destroy(expr, elem); + } +} + +static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = { + [NFTA_SET_FLAGS] = { .type = NLA_U32 }, + [NFTA_SET_SREG] = { .type = NLA_U32 }, + [NFTA_SET_DREG] = { .type = NLA_U32 }, + [NFTA_SET_KLEN] = { .type = NLA_U32 }, + [NFTA_SET_DLEN] = { .type = NLA_U32 }, + [NFTA_SET_ELEMENTS] = { .type = NLA_NESTED }, +}; + +static int nft_set_init(const struct nft_ctx *ctx, const struct nft_expr *expr, + const struct nlattr * const tb[]) +{ + struct nft_set *priv = nft_expr_priv(expr); + struct nft_set_elem *elem, *uninitialized_var(new); + struct rb_node *parent, **p; + const struct nlattr *nla; + int err, rem, d; + + if (tb[NFTA_SET_SREG] == NULL || + tb[NFTA_SET_KLEN] == NULL || + tb[NFTA_SET_ELEMENTS] == NULL) + return -EINVAL; + + priv->root = RB_ROOT; + + if (tb[NFTA_SET_FLAGS] != NULL) { + priv->flags = ntohl(nla_get_be32(tb[NFTA_SET_FLAGS])); + if (priv->flags & ~(NFT_SET_INTERVAL | NFT_SET_MAP)) + return -EINVAL; + } + + priv->sreg = ntohl(nla_get_be32(tb[NFTA_SET_SREG])); + err = nft_validate_input_register(priv->sreg); + if (err < 0) + return err; + + if (tb[NFTA_SET_DREG] != NULL) { + if (!(priv->flags & NFT_SET_MAP)) + return -EINVAL; + if (tb[NFTA_SET_DLEN] == NULL) + return -EINVAL; + + priv->dreg = ntohl(nla_get_be32(tb[NFTA_SET_DREG])); + err = nft_validate_output_register(priv->dreg); + if (err < 0) + return err; + + if (priv->dreg == NFT_REG_VERDICT) + priv->dlen = FIELD_SIZEOF(struct nft_data, data); + else { + priv->dlen = ntohl(nla_get_be32(tb[NFTA_SET_DLEN])); + if (priv->dlen == 0 || + priv->dlen > FIELD_SIZEOF(struct nft_data, data)) + return -EINVAL; + } + } else { + if (priv->flags & NFT_SET_MAP) + return -EINVAL; + if (tb[NFTA_SET_DLEN] != NULL) + return -EINVAL; + } + + priv->klen = ntohl(nla_get_be32(tb[NFTA_SET_KLEN])); + if (priv->klen == 0 || + priv->klen > FIELD_SIZEOF(struct nft_data, data)) + return -EINVAL; + + nla_for_each_nested(nla, tb[NFTA_SET_ELEMENTS], rem) { + err = -EINVAL; + if (nla_type(nla) != NFTA_LIST_ELEM) + goto err1; + + err = nft_set_elem_init(ctx, expr, nla, &new); + if (err < 0) + goto err1; + + parent = NULL; + p = &priv->root.rb_node; + while (*p != NULL) { + parent = *p; + elem = rb_entry(parent, struct nft_set_elem, node); + d = nft_data_cmp(&elem->key, &new->key, priv->klen); + if (d < 0) + p = &parent->rb_left; + else if (d > 0) + p = &parent->rb_right; + else { + err = -EEXIST; + goto err2; + } + } + rb_link_node(&new->node, parent, p); + rb_insert_color(&new->node, &priv->root); + } + + return 0; + +err2: + nft_set_elem_destroy(expr, new); +err1: + nft_set_destroy(expr); + return err; +} + +static int nft_set_dump(struct sk_buff *skb, const struct nft_expr *expr) +{ + struct nft_set *priv = nft_expr_priv(expr); + const struct nft_set_elem *elem; + struct rb_node *node; + struct nlattr *list; + + if (priv->flags) { + if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(priv->flags))) + goto nla_put_failure; + } + + if (nla_put_be32(skb, NFTA_SET_SREG, htonl(priv->sreg))) + goto nla_put_failure; + if (nla_put_be32(skb, NFTA_SET_KLEN, htonl(priv->klen))) + goto nla_put_failure; + + if (priv->flags & NFT_SET_MAP) { + if (nla_put_be32(skb, NFTA_SET_DREG, htonl(priv->dreg))) + goto nla_put_failure; + if (nla_put_be32(skb, NFTA_SET_DLEN, htonl(priv->dlen))) + goto nla_put_failure; + } + + list = nla_nest_start(skb, NFTA_SET_ELEMENTS); + if (list == NULL) + goto nla_put_failure; + + for (node = rb_first(&priv->root); node; node = rb_next(node)) { + elem = rb_entry(node, struct nft_set_elem, node); + if (nft_set_elem_dump(skb, expr, elem) < 0) + goto nla_put_failure; + } + + nla_nest_end(skb, list); + return 0; + +nla_put_failure: + return -1; +} + +static struct nft_expr_ops nft_set_ops __read_mostly = { + .name = "set", + .size = NFT_EXPR_SIZE(sizeof(struct nft_set)), + .owner = THIS_MODULE, + .eval = nft_set_eval, + .init = nft_set_init, + .destroy = nft_set_destroy, + .dump = nft_set_dump, + .policy = nft_set_policy, + .maxattr = NFTA_SET_MAX, +}; + +static int __init nft_set_module_init(void) +{ + return nft_register_expr(&nft_set_ops); +} + +static void __exit nft_set_module_exit(void) +{ + nft_unregister_expr(&nft_set_ops); +} + +module_init(nft_set_module_init); +module_exit(nft_set_module_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); +MODULE_ALIAS_NFT_EXPR("set"); |