diff options
Diffstat (limited to 'include/net/ip_tunnels.h')
| -rw-r--r-- | include/net/ip_tunnels.h | 668 |
1 files changed, 606 insertions, 62 deletions
diff --git a/include/net/ip_tunnels.h b/include/net/ip_tunnels.h index 781b3cf86a2f..ecae35512b9b 100644 --- a/include/net/ip_tunnels.h +++ b/include/net/ip_tunnels.h @@ -1,16 +1,24 @@ +/* SPDX-License-Identifier: GPL-2.0 */ #ifndef __NET_IP_TUNNELS_H #define __NET_IP_TUNNELS_H 1 #include <linux/if_tunnel.h> #include <linux/netdevice.h> #include <linux/skbuff.h> +#include <linux/socket.h> #include <linux/types.h> #include <linux/u64_stats_sync.h> +#include <linux/bitops.h> + #include <net/dsfield.h> +#include <net/flow.h> #include <net/gro_cells.h> +#include <net/inet_dscp.h> #include <net/inet_ecn.h> -#include <net/ip.h> +#include <net/netns/generic.h> #include <net/rtnetlink.h> +#include <net/lwtunnel.h> +#include <net/dst_cache.h> #if IS_ENABLED(CONFIG_IPV6) #include <net/ipv6.h> @@ -21,6 +29,89 @@ /* Keep error state on tunnel for 30 sec */ #define IPTUNNEL_ERR_TIMEO (30*HZ) +/* Used to memset ip_tunnel padding. */ +#define IP_TUNNEL_KEY_SIZE offsetofend(struct ip_tunnel_key, tp_dst) + +/* Used to memset ipv4 address padding. */ +#define IP_TUNNEL_KEY_IPV4_PAD offsetofend(struct ip_tunnel_key, u.ipv4.dst) +#define IP_TUNNEL_KEY_IPV4_PAD_LEN \ + (sizeof_field(struct ip_tunnel_key, u) - \ + sizeof_field(struct ip_tunnel_key, u.ipv4)) + +#define __ipt_flag_op(op, ...) \ + op(__VA_ARGS__, __IP_TUNNEL_FLAG_NUM) + +#define IP_TUNNEL_DECLARE_FLAGS(...) \ + __ipt_flag_op(DECLARE_BITMAP, __VA_ARGS__) + +#define ip_tunnel_flags_zero(...) __ipt_flag_op(bitmap_zero, __VA_ARGS__) +#define ip_tunnel_flags_copy(...) __ipt_flag_op(bitmap_copy, __VA_ARGS__) +#define ip_tunnel_flags_and(...) __ipt_flag_op(bitmap_and, __VA_ARGS__) +#define ip_tunnel_flags_or(...) __ipt_flag_op(bitmap_or, __VA_ARGS__) + +#define ip_tunnel_flags_empty(...) \ + __ipt_flag_op(bitmap_empty, __VA_ARGS__) +#define ip_tunnel_flags_intersect(...) \ + __ipt_flag_op(bitmap_intersects, __VA_ARGS__) +#define ip_tunnel_flags_subset(...) \ + __ipt_flag_op(bitmap_subset, __VA_ARGS__) + +struct ip_tunnel_key { + __be64 tun_id; + union { + struct { + __be32 src; + __be32 dst; + } ipv4; + struct { + struct in6_addr src; + struct in6_addr dst; + } ipv6; + } u; + IP_TUNNEL_DECLARE_FLAGS(tun_flags); + __be32 label; /* Flow Label for IPv6 */ + u32 nhid; + u8 tos; /* TOS for IPv4, TC for IPv6 */ + u8 ttl; /* TTL for IPv4, HL for IPv6 */ + __be16 tp_src; + __be16 tp_dst; + __u8 flow_flags; +}; + +struct ip_tunnel_encap { + u16 type; + u16 flags; + __be16 sport; + __be16 dport; +}; + +/* Flags for ip_tunnel_info mode. */ +#define IP_TUNNEL_INFO_TX 0x01 /* represents tx tunnel parameters */ +#define IP_TUNNEL_INFO_IPV6 0x02 /* key contains IPv6 addresses */ +#define IP_TUNNEL_INFO_BRIDGE 0x04 /* represents a bridged tunnel id */ + +/* Maximum tunnel options length. */ +#define IP_TUNNEL_OPTS_MAX \ + GENMASK((sizeof_field(struct ip_tunnel_info, \ + options_len) * BITS_PER_BYTE) - 1, 0) + +#define ip_tunnel_info_opts(info) \ + _Generic(info, \ + const struct ip_tunnel_info * : ((const void *)(info)->options),\ + struct ip_tunnel_info * : ((void *)(info)->options)\ + ) + +struct ip_tunnel_info { + struct ip_tunnel_key key; + struct ip_tunnel_encap encap; +#ifdef CONFIG_DST_CACHE + struct dst_cache dst_cache; +#endif + u8 options_len; + u8 mode; + u8 options[] __aligned_largest __counted_by(options_len); +}; + /* 6rd prefix/relay information */ #ifdef CONFIG_IPV6_SIT_6RD struct ip_tunnel_6rd_parm { @@ -38,23 +129,51 @@ struct ip_tunnel_prl_entry { struct rcu_head rcu_head; }; +struct metadata_dst; + +/* Kernel-side variant of ip_tunnel_parm */ +struct ip_tunnel_parm_kern { + char name[IFNAMSIZ]; + IP_TUNNEL_DECLARE_FLAGS(i_flags); + IP_TUNNEL_DECLARE_FLAGS(o_flags); + __be32 i_key; + __be32 o_key; + int link; + struct iphdr iph; +}; + struct ip_tunnel { struct ip_tunnel __rcu *next; struct hlist_node hash_node; + struct net_device *dev; + netdevice_tracker dev_tracker; + struct net *net; /* netns for packet i/o */ - int err_count; /* Number of arrived ICMP errors */ unsigned long err_time; /* Time when the last ICMP error * arrived */ + int err_count; /* Number of arrived ICMP errors */ /* These four fields used only by GRE */ - __u32 i_seqno; /* The last seen seqno */ - __u32 o_seqno; /* The last output seqno */ - int hlen; /* Precalculated header length */ - int mlink; + u32 i_seqno; /* The last seen seqno */ + atomic_t o_seqno; /* The last output seqno */ + int tun_hlen; /* Precalculated header length */ - struct ip_tunnel_parm parms; + /* These four fields used only by ERSPAN */ + u32 index; /* ERSPAN type II index */ + u8 erspan_ver; /* ERSPAN version */ + u8 dir; /* ERSPAN direction */ + u16 hwid; /* ERSPAN hardware ID */ + + struct dst_cache dst_cache; + + struct ip_tunnel_parm_kern parms; + + int mlink; + int encap_hlen; /* Encap header length (FOU,GUE) */ + int hlen; /* tun_hlen + encap_hlen */ + struct ip_tunnel_encap encap; /* for SIT */ #ifdef CONFIG_IPV6_SIT_6RD @@ -62,81 +181,411 @@ struct ip_tunnel { #endif struct ip_tunnel_prl_entry __rcu *prl; /* potential router list */ unsigned int prl_count; /* # of entries in PRL */ - int ip_tnl_net_id; + unsigned int ip_tnl_net_id; struct gro_cells gro_cells; + __u32 fwmark; + bool collect_md; + bool ignore_df; }; -#define TUNNEL_CSUM __cpu_to_be16(0x01) -#define TUNNEL_ROUTING __cpu_to_be16(0x02) -#define TUNNEL_KEY __cpu_to_be16(0x04) -#define TUNNEL_SEQ __cpu_to_be16(0x08) -#define TUNNEL_STRICT __cpu_to_be16(0x10) -#define TUNNEL_REC __cpu_to_be16(0x20) -#define TUNNEL_VERSION __cpu_to_be16(0x40) -#define TUNNEL_NO_KEY __cpu_to_be16(0x80) -#define TUNNEL_DONT_FRAGMENT __cpu_to_be16(0x0100) - struct tnl_ptk_info { - __be16 flags; + IP_TUNNEL_DECLARE_FLAGS(flags); __be16 proto; __be32 key; __be32 seq; + int hdr_len; }; #define PACKET_RCVD 0 #define PACKET_REJECT 1 +#define PACKET_NEXT 2 -#define IP_TNL_HASH_BITS 10 +#define IP_TNL_HASH_BITS 7 #define IP_TNL_HASH_SIZE (1 << IP_TNL_HASH_BITS) struct ip_tunnel_net { - struct hlist_head *tunnels; struct net_device *fb_tunnel_dev; + struct rtnl_link_ops *rtnl_link_ops; + struct hlist_head tunnels[IP_TNL_HASH_SIZE]; + struct ip_tunnel __rcu *collect_md_tun; + int type; }; +static inline void ip_tunnel_set_options_present(unsigned long *flags) +{ + IP_TUNNEL_DECLARE_FLAGS(present) = { }; + + __set_bit(IP_TUNNEL_GENEVE_OPT_BIT, present); + __set_bit(IP_TUNNEL_VXLAN_OPT_BIT, present); + __set_bit(IP_TUNNEL_ERSPAN_OPT_BIT, present); + __set_bit(IP_TUNNEL_GTP_OPT_BIT, present); + __set_bit(IP_TUNNEL_PFCP_OPT_BIT, present); + + ip_tunnel_flags_or(flags, flags, present); +} + +static inline void ip_tunnel_clear_options_present(unsigned long *flags) +{ + IP_TUNNEL_DECLARE_FLAGS(present) = { }; + + __set_bit(IP_TUNNEL_GENEVE_OPT_BIT, present); + __set_bit(IP_TUNNEL_VXLAN_OPT_BIT, present); + __set_bit(IP_TUNNEL_ERSPAN_OPT_BIT, present); + __set_bit(IP_TUNNEL_GTP_OPT_BIT, present); + __set_bit(IP_TUNNEL_PFCP_OPT_BIT, present); + + __ipt_flag_op(bitmap_andnot, flags, flags, present); +} + +static inline bool ip_tunnel_is_options_present(const unsigned long *flags) +{ + IP_TUNNEL_DECLARE_FLAGS(present) = { }; + + __set_bit(IP_TUNNEL_GENEVE_OPT_BIT, present); + __set_bit(IP_TUNNEL_VXLAN_OPT_BIT, present); + __set_bit(IP_TUNNEL_ERSPAN_OPT_BIT, present); + __set_bit(IP_TUNNEL_GTP_OPT_BIT, present); + __set_bit(IP_TUNNEL_PFCP_OPT_BIT, present); + + return ip_tunnel_flags_intersect(flags, present); +} + +static inline bool ip_tunnel_flags_is_be16_compat(const unsigned long *flags) +{ + IP_TUNNEL_DECLARE_FLAGS(supp) = { }; + + bitmap_set(supp, 0, BITS_PER_TYPE(__be16)); + __set_bit(IP_TUNNEL_VTI_BIT, supp); + + return ip_tunnel_flags_subset(flags, supp); +} + +static inline void ip_tunnel_flags_from_be16(unsigned long *dst, __be16 flags) +{ + ip_tunnel_flags_zero(dst); + + bitmap_write(dst, be16_to_cpu(flags), 0, BITS_PER_TYPE(__be16)); + __assign_bit(IP_TUNNEL_VTI_BIT, dst, flags & VTI_ISVTI); +} + +static inline __be16 ip_tunnel_flags_to_be16(const unsigned long *flags) +{ + __be16 ret; + + ret = cpu_to_be16(bitmap_read(flags, 0, BITS_PER_TYPE(__be16))); + if (test_bit(IP_TUNNEL_VTI_BIT, flags)) + ret |= VTI_ISVTI; + + return ret; +} + +static inline void ip_tunnel_key_init(struct ip_tunnel_key *key, + __be32 saddr, __be32 daddr, + u8 tos, u8 ttl, __be32 label, + __be16 tp_src, __be16 tp_dst, + __be64 tun_id, + const unsigned long *tun_flags) +{ + key->tun_id = tun_id; + key->u.ipv4.src = saddr; + key->u.ipv4.dst = daddr; + memset((unsigned char *)key + IP_TUNNEL_KEY_IPV4_PAD, + 0, IP_TUNNEL_KEY_IPV4_PAD_LEN); + key->tos = tos; + key->ttl = ttl; + key->label = label; + ip_tunnel_flags_copy(key->tun_flags, tun_flags); + + /* For the tunnel types on the top of IPsec, the tp_src and tp_dst of + * the upper tunnel are used. + * E.g: GRE over IPSEC, the tp_src and tp_port are zero. + */ + key->tp_src = tp_src; + key->tp_dst = tp_dst; + + /* Clear struct padding. */ + if (sizeof(*key) != IP_TUNNEL_KEY_SIZE) + memset((unsigned char *)key + IP_TUNNEL_KEY_SIZE, + 0, sizeof(*key) - IP_TUNNEL_KEY_SIZE); +} + +static inline bool +ip_tunnel_dst_cache_usable(const struct sk_buff *skb, + const struct ip_tunnel_info *info) +{ + if (skb->mark) + return false; + + return !info || !test_bit(IP_TUNNEL_NOCACHE_BIT, info->key.tun_flags); +} + +static inline unsigned short ip_tunnel_info_af(const struct ip_tunnel_info + *tun_info) +{ + return tun_info->mode & IP_TUNNEL_INFO_IPV6 ? AF_INET6 : AF_INET; +} + +static inline __be64 key32_to_tunnel_id(__be32 key) +{ +#ifdef __BIG_ENDIAN + return (__force __be64)key; +#else + return (__force __be64)((__force u64)key << 32); +#endif +} + +/* Returns the least-significant 32 bits of a __be64. */ +static inline __be32 tunnel_id_to_key32(__be64 tun_id) +{ +#ifdef __BIG_ENDIAN + return (__force __be32)tun_id; +#else + return (__force __be32)((__force u64)tun_id >> 32); +#endif +} + #ifdef CONFIG_INET +static inline void ip_tunnel_init_flow(struct flowi4 *fl4, + int proto, + __be32 daddr, __be32 saddr, + __be32 key, __u8 tos, + struct net *net, int oif, + __u32 mark, __u32 tun_inner_hash, + __u8 flow_flags) +{ + memset(fl4, 0, sizeof(*fl4)); + + if (oif) { + fl4->flowi4_l3mdev = l3mdev_master_upper_ifindex_by_index(net, oif); + /* Legacy VRF/l3mdev use case */ + fl4->flowi4_oif = fl4->flowi4_l3mdev ? 0 : oif; + } + + fl4->daddr = daddr; + fl4->saddr = saddr; + fl4->flowi4_dscp = inet_dsfield_to_dscp(tos); + fl4->flowi4_proto = proto; + fl4->fl4_gre_key = key; + fl4->flowi4_mark = mark; + fl4->flowi4_multipath_hash = tun_inner_hash; + fl4->flowi4_flags = flow_flags; +} + int ip_tunnel_init(struct net_device *dev); void ip_tunnel_uninit(struct net_device *dev); void ip_tunnel_dellink(struct net_device *dev, struct list_head *head); -int ip_tunnel_init_net(struct net *net, int ip_tnl_net_id, +struct net *ip_tunnel_get_link_net(const struct net_device *dev); +int ip_tunnel_get_iflink(const struct net_device *dev); +int ip_tunnel_init_net(struct net *net, unsigned int ip_tnl_net_id, struct rtnl_link_ops *ops, char *devname); - -void ip_tunnel_delete_net(struct ip_tunnel_net *itn); +void ip_tunnel_delete_net(struct net *net, unsigned int id, + struct rtnl_link_ops *ops, + struct list_head *dev_to_kill); void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev, const struct iphdr *tnl_params, const u8 protocol); -int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd); +void ip_md_tunnel_xmit(struct sk_buff *skb, struct net_device *dev, + const u8 proto, int tunnel_hlen); +int ip_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm_kern *p, + int cmd); +bool ip_tunnel_parm_from_user(struct ip_tunnel_parm_kern *kp, + const void __user *data); +bool ip_tunnel_parm_to_user(void __user *data, struct ip_tunnel_parm_kern *kp); +int ip_tunnel_siocdevprivate(struct net_device *dev, struct ifreq *ifr, + void __user *data, int cmd); +int __ip_tunnel_change_mtu(struct net_device *dev, int new_mtu, bool strict); int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu); -struct rtnl_link_stats64 *ip_tunnel_get_stats64(struct net_device *dev, - struct rtnl_link_stats64 *tot); struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn, - int link, __be16 flags, + int link, const unsigned long *flags, __be32 remote, __be32 local, __be32 key); +void ip_tunnel_md_udp_encap(struct sk_buff *skb, struct ip_tunnel_info *info); int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb, - const struct tnl_ptk_info *tpi, bool log_ecn_error); + const struct tnl_ptk_info *tpi, struct metadata_dst *tun_dst, + bool log_ecn_error); int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[], - struct ip_tunnel_parm *p); -int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[], - struct ip_tunnel_parm *p); -void ip_tunnel_setup(struct net_device *dev, int net_id); + struct ip_tunnel_parm_kern *p, __u32 fwmark); +int ip_tunnel_newlink(struct net *net, struct net_device *dev, + struct nlattr *tb[], struct ip_tunnel_parm_kern *p, + __u32 fwmark); +void ip_tunnel_setup(struct net_device *dev, unsigned int net_id); + +bool ip_tunnel_netlink_encap_parms(struct nlattr *data[], + struct ip_tunnel_encap *encap); + +void ip_tunnel_netlink_parms(struct nlattr *data[], + struct ip_tunnel_parm_kern *parms); + +extern const struct header_ops ip_tunnel_header_ops; +__be16 ip_tunnel_parse_protocol(const struct sk_buff *skb); + +struct ip_tunnel_encap_ops { + size_t (*encap_hlen)(struct ip_tunnel_encap *e); + int (*build_header)(struct sk_buff *skb, struct ip_tunnel_encap *e, + u8 *protocol, struct flowi4 *fl4); + int (*err_handler)(struct sk_buff *skb, u32 info); +}; + +#define MAX_IPTUN_ENCAP_OPS 8 + +extern const struct ip_tunnel_encap_ops __rcu * + iptun_encaps[MAX_IPTUN_ENCAP_OPS]; + +int ip_tunnel_encap_add_ops(const struct ip_tunnel_encap_ops *op, + unsigned int num); +int ip_tunnel_encap_del_ops(const struct ip_tunnel_encap_ops *op, + unsigned int num); + +int ip_tunnel_encap_setup(struct ip_tunnel *t, + struct ip_tunnel_encap *ipencap); + +static inline enum skb_drop_reason +pskb_inet_may_pull_reason(struct sk_buff *skb) +{ + int nhlen; + + switch (skb->protocol) { +#if IS_ENABLED(CONFIG_IPV6) + case htons(ETH_P_IPV6): + nhlen = sizeof(struct ipv6hdr); + break; +#endif + case htons(ETH_P_IP): + nhlen = sizeof(struct iphdr); + break; + default: + nhlen = 0; + } + + return pskb_network_may_pull_reason(skb, nhlen); +} + +static inline bool pskb_inet_may_pull(struct sk_buff *skb) +{ + return pskb_inet_may_pull_reason(skb) == SKB_NOT_DROPPED_YET; +} + +/* Variant of pskb_inet_may_pull(). + */ +static inline enum skb_drop_reason +skb_vlan_inet_prepare(struct sk_buff *skb, bool inner_proto_inherit) +{ + int nhlen = 0, maclen = inner_proto_inherit ? 0 : ETH_HLEN; + __be16 type = skb->protocol; + enum skb_drop_reason reason; + + /* Essentially this is skb_protocol(skb, true) + * And we get MAC len. + */ + if (eth_type_vlan(type)) + type = __vlan_get_protocol(skb, type, &maclen); + + switch (type) { +#if IS_ENABLED(CONFIG_IPV6) + case htons(ETH_P_IPV6): + nhlen = sizeof(struct ipv6hdr); + break; +#endif + case htons(ETH_P_IP): + nhlen = sizeof(struct iphdr); + break; + } + /* For ETH_P_IPV6/ETH_P_IP we make sure to pull + * a base network header in skb->head. + */ + reason = pskb_may_pull_reason(skb, maclen + nhlen); + if (reason) + return reason; + + skb_set_network_header(skb, maclen); + + return SKB_NOT_DROPPED_YET; +} + +static inline int ip_encap_hlen(struct ip_tunnel_encap *e) +{ + const struct ip_tunnel_encap_ops *ops; + int hlen = -EINVAL; + + if (e->type == TUNNEL_ENCAP_NONE) + return 0; + + if (e->type >= MAX_IPTUN_ENCAP_OPS) + return -EINVAL; + + rcu_read_lock(); + ops = rcu_dereference(iptun_encaps[e->type]); + if (likely(ops && ops->encap_hlen)) + hlen = ops->encap_hlen(e); + rcu_read_unlock(); + + return hlen; +} + +static inline int ip_tunnel_encap(struct sk_buff *skb, + struct ip_tunnel_encap *e, + u8 *protocol, struct flowi4 *fl4) +{ + const struct ip_tunnel_encap_ops *ops; + int ret = -EINVAL; + + if (e->type == TUNNEL_ENCAP_NONE) + return 0; + + if (e->type >= MAX_IPTUN_ENCAP_OPS) + return -EINVAL; + + rcu_read_lock(); + ops = rcu_dereference(iptun_encaps[e->type]); + if (likely(ops && ops->build_header)) + ret = ops->build_header(skb, e, protocol, fl4); + rcu_read_unlock(); + + return ret; +} /* Extract dsfield from inner protocol */ static inline u8 ip_tunnel_get_dsfield(const struct iphdr *iph, const struct sk_buff *skb) { - if (skb->protocol == htons(ETH_P_IP)) + __be16 payload_protocol = skb_protocol(skb, true); + + if (payload_protocol == htons(ETH_P_IP)) return iph->tos; - else if (skb->protocol == htons(ETH_P_IPV6)) + else if (payload_protocol == htons(ETH_P_IPV6)) return ipv6_get_dsfield((const struct ipv6hdr *)iph); else return 0; } -/* Propogate ECN bits out */ +static inline __be32 ip_tunnel_get_flowlabel(const struct iphdr *iph, + const struct sk_buff *skb) +{ + __be16 payload_protocol = skb_protocol(skb, true); + + if (payload_protocol == htons(ETH_P_IPV6)) + return ip6_flowlabel((const struct ipv6hdr *)iph); + else + return 0; +} + +static inline u8 ip_tunnel_get_ttl(const struct iphdr *iph, + const struct sk_buff *skb) +{ + __be16 payload_protocol = skb_protocol(skb, true); + + if (payload_protocol == htons(ETH_P_IP)) + return iph->ttl; + else if (payload_protocol == htons(ETH_P_IPV6)) + return ((const struct ipv6hdr *)iph)->hop_limit; + else + return 0; +} + +/* Propagate ECN bits out */ static inline u8 ip_tunnel_ecn_encap(u8 tos, const struct iphdr *iph, const struct sk_buff *skb) { @@ -145,45 +594,140 @@ static inline u8 ip_tunnel_ecn_encap(u8 tos, const struct iphdr *iph, return INET_ECN_encapsulate(tos, inner); } -static inline void tunnel_ip_select_ident(struct sk_buff *skb, - const struct iphdr *old_iph, - struct dst_entry *dst) +int __iptunnel_pull_header(struct sk_buff *skb, int hdr_len, + __be16 inner_proto, bool raw_proto, bool xnet); + +static inline int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, + __be16 inner_proto, bool xnet) { - struct iphdr *iph = ip_hdr(skb); + return __iptunnel_pull_header(skb, hdr_len, inner_proto, false, xnet); +} - /* Use inner packet iph-id if possible. */ - if (skb->protocol == htons(ETH_P_IP) && old_iph->id) - iph->id = old_iph->id; - else - __ip_select_ident(iph, dst, - (skb_shinfo(skb)->gso_segs ?: 1) - 1); +void iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb, + __be32 src, __be32 dst, u8 proto, + u8 tos, u8 ttl, __be16 df, bool xnet, u16 ipcb_flags); +struct metadata_dst *iptunnel_metadata_reply(struct metadata_dst *md, + gfp_t flags); +int skb_tunnel_check_pmtu(struct sk_buff *skb, struct dst_entry *encap_dst, + int headroom, bool reply); + +static inline void ip_tunnel_adj_headroom(struct net_device *dev, + unsigned int headroom) +{ + /* we must cap headroom to some upperlimit, else pskb_expand_head + * will overflow header offsets in skb_headers_offset_update(). + */ + const unsigned int max_allowed = 512; + + if (headroom > max_allowed) + headroom = max_allowed; + + if (headroom > READ_ONCE(dev->needed_headroom)) + WRITE_ONCE(dev->needed_headroom, headroom); } -int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto); -int iptunnel_xmit(struct net *net, struct rtable *rt, - struct sk_buff *skb, - __be32 src, __be32 dst, __u8 proto, - __u8 tos, __u8 ttl, __be16 df); +int iptunnel_handle_offloads(struct sk_buff *skb, int gso_type_mask); + +static inline int iptunnel_pull_offloads(struct sk_buff *skb) +{ + if (skb_is_gso(skb)) { + int err; + + err = skb_unclone(skb, GFP_ATOMIC); + if (unlikely(err)) + return err; + skb_shinfo(skb)->gso_type &= ~(NETIF_F_GSO_ENCAP_ALL >> + NETIF_F_GSO_SHIFT); + } + + skb->encapsulation = 0; + return 0; +} -static inline void iptunnel_xmit_stats(int err, - struct net_device_stats *err_stats, - struct pcpu_tstats __percpu *stats) +static inline void iptunnel_xmit_stats(struct net_device *dev, int pkt_len) { - if (err > 0) { - struct pcpu_tstats *tstats = this_cpu_ptr(stats); + if (pkt_len > 0) { + struct pcpu_sw_netstats *tstats = get_cpu_ptr(dev->tstats); u64_stats_update_begin(&tstats->syncp); - tstats->tx_bytes += err; - tstats->tx_packets++; + u64_stats_add(&tstats->tx_bytes, pkt_len); + u64_stats_inc(&tstats->tx_packets); u64_stats_update_end(&tstats->syncp); - } else if (err < 0) { - err_stats->tx_errors++; - err_stats->tx_aborted_errors++; + put_cpu_ptr(tstats); + return; + } + + if (pkt_len < 0) { + DEV_STATS_INC(dev, tx_errors); + DEV_STATS_INC(dev, tx_aborted_errors); } else { - err_stats->tx_dropped++; + DEV_STATS_INC(dev, tx_dropped); + } +} + +static inline void ip_tunnel_info_opts_get(void *to, + const struct ip_tunnel_info *info) +{ + memcpy(to, ip_tunnel_info_opts(info), info->options_len); +} + +static inline void ip_tunnel_info_opts_set(struct ip_tunnel_info *info, + const void *from, int len, + const unsigned long *flags) +{ + info->options_len = len; + if (len > 0) { + memcpy(ip_tunnel_info_opts(info), from, len); + ip_tunnel_flags_or(info->key.tun_flags, info->key.tun_flags, + flags); } } +static inline struct ip_tunnel_info *lwt_tun_info(struct lwtunnel_state *lwtstate) +{ + return (struct ip_tunnel_info *)lwtstate->data; +} + +DECLARE_STATIC_KEY_FALSE(ip_tunnel_metadata_cnt); + +/* Returns > 0 if metadata should be collected */ +static inline int ip_tunnel_collect_metadata(void) +{ + return static_branch_unlikely(&ip_tunnel_metadata_cnt); +} + +void __init ip_tunnel_core_init(void); + +void ip_tunnel_need_metadata(void); +void ip_tunnel_unneed_metadata(void); + +#else /* CONFIG_INET */ + +static inline struct ip_tunnel_info *lwt_tun_info(struct lwtunnel_state *lwtstate) +{ + return NULL; +} + +static inline void ip_tunnel_need_metadata(void) +{ +} + +static inline void ip_tunnel_unneed_metadata(void) +{ +} + +static inline void ip_tunnel_info_opts_get(void *to, + const struct ip_tunnel_info *info) +{ +} + +static inline void ip_tunnel_info_opts_set(struct ip_tunnel_info *info, + const void *from, int len, + const unsigned long *flags) +{ + info->options_len = 0; +} + #endif /* CONFIG_INET */ #endif /* __NET_IP_TUNNELS_H */ |