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-rw-r--r--net/mptcp/protocol.h1215
1 files changed, 1060 insertions, 155 deletions
diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h
index 809687d3f410..9c0d17876b22 100644
--- a/net/mptcp/protocol.h
+++ b/net/mptcp/protocol.h
@@ -10,6 +10,9 @@
#include <linux/random.h>
#include <net/tcp.h>
#include <net/inet_connection_sock.h>
+#include <uapi/linux/mptcp.h>
+#include <net/genetlink.h>
+#include <net/rstreason.h>
#define MPTCP_SUPPORTED_VERSION 1
@@ -21,8 +24,19 @@
#define OPTION_MPTCP_MPJ_SYNACK BIT(4)
#define OPTION_MPTCP_MPJ_ACK BIT(5)
#define OPTION_MPTCP_ADD_ADDR BIT(6)
-#define OPTION_MPTCP_ADD_ADDR6 BIT(7)
-#define OPTION_MPTCP_RM_ADDR BIT(8)
+#define OPTION_MPTCP_RM_ADDR BIT(7)
+#define OPTION_MPTCP_FASTCLOSE BIT(8)
+#define OPTION_MPTCP_PRIO BIT(9)
+#define OPTION_MPTCP_RST BIT(10)
+#define OPTION_MPTCP_DSS BIT(11)
+#define OPTION_MPTCP_FAIL BIT(12)
+
+#define OPTION_MPTCP_CSUMREQD BIT(13)
+
+#define OPTIONS_MPTCP_MPC (OPTION_MPTCP_MPC_SYN | OPTION_MPTCP_MPC_SYNACK | \
+ OPTION_MPTCP_MPC_ACK)
+#define OPTIONS_MPTCP_MPJ (OPTION_MPTCP_MPJ_SYN | OPTION_MPTCP_MPJ_SYNACK | \
+ OPTION_MPTCP_MPJ_ACK)
/* MPTCP option subtypes */
#define MPTCPOPT_MP_CAPABLE 0
@@ -33,6 +47,7 @@
#define MPTCPOPT_MP_PRIO 5
#define MPTCPOPT_MP_FAIL 6
#define MPTCPOPT_MP_FASTCLOSE 7
+#define MPTCPOPT_RST 8
/* MPTCP suboption lengths */
#define TCPOLEN_MPTCP_MPC_SYN 4
@@ -57,19 +72,27 @@
#define TCPOLEN_MPTCP_ADD_ADDR6_BASE 20
#define TCPOLEN_MPTCP_ADD_ADDR6_BASE_PORT 22
#define TCPOLEN_MPTCP_PORT_LEN 2
-#define TCPOLEN_MPTCP_RM_ADDR_BASE 4
+#define TCPOLEN_MPTCP_PORT_ALIGN 2
+#define TCPOLEN_MPTCP_RM_ADDR_BASE 3
+#define TCPOLEN_MPTCP_PRIO 3
+#define TCPOLEN_MPTCP_PRIO_ALIGN 4
+#define TCPOLEN_MPTCP_FASTCLOSE 12
+#define TCPOLEN_MPTCP_RST 4
+#define TCPOLEN_MPTCP_FAIL 12
+
+#define TCPOLEN_MPTCP_MPC_ACK_DATA_CSUM (TCPOLEN_MPTCP_DSS_CHECKSUM + TCPOLEN_MPTCP_MPC_ACK_DATA)
/* MPTCP MP_JOIN flags */
#define MPTCPOPT_BACKUP BIT(0)
-#define MPTCPOPT_HMAC_LEN 20
#define MPTCPOPT_THMAC_LEN 8
/* MPTCP MP_CAPABLE flags */
#define MPTCP_VERSION_MASK (0x0F)
#define MPTCP_CAP_CHECKSUM_REQD BIT(7)
#define MPTCP_CAP_EXTENSIBILITY BIT(6)
+#define MPTCP_CAP_DENY_JOIN_ID0 BIT(5)
#define MPTCP_CAP_HMAC_SHA256 BIT(0)
-#define MPTCP_CAP_FLAG_MASK (0x3F)
+#define MPTCP_CAP_FLAG_MASK (0x1F)
/* MPTCP DSS flags */
#define MPTCP_DSS_DATA_FIN BIT(4)
@@ -81,14 +104,43 @@
/* MPTCP ADD_ADDR flags */
#define MPTCP_ADDR_ECHO BIT(0)
-#define MPTCP_ADDR_IPVERSION_4 4
-#define MPTCP_ADDR_IPVERSION_6 6
-/* MPTCP socket flags */
-#define MPTCP_DATA_READY 0
-#define MPTCP_SEND_SPACE 1
-#define MPTCP_WORK_RTX 2
-#define MPTCP_WORK_EOF 3
+/* MPTCP MP_PRIO flags */
+#define MPTCP_PRIO_BKUP BIT(0)
+
+/* MPTCP TCPRST flags */
+#define MPTCP_RST_TRANSIENT BIT(0)
+
+/* MPTCP socket atomic flags */
+#define MPTCP_WORK_RTX 1
+#define MPTCP_FALLBACK_DONE 2
+#define MPTCP_WORK_CLOSE_SUBFLOW 3
+
+/* MPTCP socket release cb flags */
+#define MPTCP_PUSH_PENDING 1
+#define MPTCP_CLEAN_UNA 2
+#define MPTCP_ERROR_REPORT 3
+#define MPTCP_RETRANSMIT 4
+#define MPTCP_FLUSH_JOIN_LIST 5
+#define MPTCP_SYNC_STATE 6
+#define MPTCP_SYNC_SNDBUF 7
+
+struct mptcp_skb_cb {
+ u64 map_seq;
+ u64 end_seq;
+ u32 offset;
+ u8 has_rxtstamp;
+ u8 cant_coalesce;
+};
+
+#define MPTCP_SKB_CB(__skb) ((struct mptcp_skb_cb *)&((__skb)->cb[0]))
+
+static inline bool before64(__u64 seq1, __u64 seq2)
+{
+ return (__s64)(seq1 - seq2) < 0;
+}
+
+#define after64(seq2, seq1) before64(seq1, seq2)
struct mptcp_options_received {
u64 sndr_key;
@@ -97,36 +149,31 @@ struct mptcp_options_received {
u64 data_seq;
u32 subflow_seq;
u16 data_len;
- u16 mp_capable : 1,
- mp_join : 1,
- dss : 1,
- add_addr : 1,
- rm_addr : 1,
- family : 4,
- echo : 1,
- backup : 1;
+ __sum16 csum;
+ struct_group(status,
+ u16 suboptions;
+ u16 use_map:1,
+ dsn64:1,
+ data_fin:1,
+ use_ack:1,
+ ack64:1,
+ mpc_map:1,
+ reset_reason:4,
+ reset_transient:1,
+ echo:1,
+ backup:1,
+ deny_join_id0:1,
+ __unused:2;
+ );
+ u8 join_id;
u32 token;
u32 nonce;
u64 thmac;
- u8 hmac[20];
- u8 join_id;
- u8 use_map:1,
- dsn64:1,
- data_fin:1,
- use_ack:1,
- ack64:1,
- mpc_map:1,
- __unused:2;
- u8 addr_id;
- u8 rm_id;
- union {
- struct in_addr addr;
-#if IS_ENABLED(CONFIG_MPTCP_IPV6)
- struct in6_addr addr6;
-#endif
- };
+ u8 hmac[MPTCPOPT_HMAC_LEN];
+ struct mptcp_addr_info addr;
+ struct mptcp_rm_list rm_list;
u64 ahmac;
- u16 port;
+ u64 fail_seq;
};
static inline __be32 mptcp_option(u8 subopt, u8 len, u8 nib, u8 field)
@@ -135,56 +182,89 @@ static inline __be32 mptcp_option(u8 subopt, u8 len, u8 nib, u8 field)
((nib & 0xF) << 8) | field);
}
-#define MPTCP_PM_MAX_ADDR 4
-
-struct mptcp_addr_info {
- sa_family_t family;
- __be16 port;
- u8 id;
- union {
- struct in_addr addr;
-#if IS_ENABLED(CONFIG_MPTCP_IPV6)
- struct in6_addr addr6;
-#endif
- };
-};
-
enum mptcp_pm_status {
MPTCP_PM_ADD_ADDR_RECEIVED,
+ MPTCP_PM_ADD_ADDR_SEND_ACK,
+ MPTCP_PM_RM_ADDR_RECEIVED,
MPTCP_PM_ESTABLISHED,
MPTCP_PM_SUBFLOW_ESTABLISHED,
+ MPTCP_PM_ALREADY_ESTABLISHED, /* persistent status, set after ESTABLISHED event */
+ MPTCP_PM_MPC_ENDPOINT_ACCOUNTED /* persistent status, set after MPC local address is
+ * accounted int id_avail_bitmap
+ */
+};
+
+enum mptcp_pm_type {
+ MPTCP_PM_TYPE_KERNEL = 0,
+ MPTCP_PM_TYPE_USERSPACE,
+
+ __MPTCP_PM_TYPE_NR,
+ __MPTCP_PM_TYPE_MAX = __MPTCP_PM_TYPE_NR - 1,
+};
+
+/* Status bits below MPTCP_PM_ALREADY_ESTABLISHED need pm worker actions */
+#define MPTCP_PM_WORK_MASK ((1 << MPTCP_PM_ALREADY_ESTABLISHED) - 1)
+
+enum mptcp_addr_signal_status {
+ MPTCP_ADD_ADDR_SIGNAL,
+ MPTCP_ADD_ADDR_ECHO,
+ MPTCP_RM_ADDR_SIGNAL,
};
+/* max value of mptcp_addr_info.id */
+#define MPTCP_PM_MAX_ADDR_ID U8_MAX
+
struct mptcp_pm_data {
struct mptcp_addr_info local;
struct mptcp_addr_info remote;
+ struct list_head anno_list;
+ struct list_head userspace_pm_local_addr_list;
spinlock_t lock; /*protects the whole PM data */
- bool addr_signal;
+ struct_group(reset,
+
+ u8 addr_signal;
bool server_side;
bool work_pending;
bool accept_addr;
bool accept_subflow;
+ bool remote_deny_join_id0;
u8 add_addr_signaled;
u8 add_addr_accepted;
u8 local_addr_used;
- u8 subflows;
- u8 add_addr_signal_max;
- u8 add_addr_accept_max;
- u8 local_addr_max;
- u8 subflows_max;
+ u8 pm_type;
+ u8 extra_subflows;
u8 status;
- struct work_struct work;
+ );
+
+ DECLARE_BITMAP(id_avail_bitmap, MPTCP_PM_MAX_ADDR_ID + 1);
+ struct mptcp_rm_list rm_list_tx;
+ struct mptcp_rm_list rm_list_rx;
+};
+
+struct mptcp_pm_local {
+ struct mptcp_addr_info addr;
+ u8 flags;
+ int ifindex;
+};
+
+struct mptcp_pm_addr_entry {
+ struct list_head list;
+ struct mptcp_addr_info addr;
+ u8 flags;
+ int ifindex;
+ struct socket *lsk;
};
struct mptcp_data_frag {
struct list_head list;
u64 data_seq;
- int data_len;
- int offset;
- int overhead;
+ u16 data_len;
+ u16 offset;
+ u16 overhead;
+ u16 already_sent;
struct page *page;
};
@@ -192,59 +272,203 @@ struct mptcp_data_frag {
struct mptcp_sock {
/* inet_connection_sock must be the first member */
struct inet_connection_sock sk;
- u64 local_key;
- u64 remote_key;
+ u64 local_key; /* protected by the first subflow socket lock
+ * lockless access read
+ */
+ u64 remote_key; /* same as above */
u64 write_seq;
+ u64 bytes_sent;
+ u64 snd_nxt;
+ u64 bytes_received;
u64 ack_seq;
- atomic64_t snd_una;
+ atomic64_t rcv_wnd_sent;
+ u64 rcv_data_fin_seq;
+ u64 bytes_retrans;
+ u64 bytes_consumed;
+ int snd_burst;
+ int old_wspace;
+ u64 recovery_snd_nxt; /* in recovery mode accept up to this seq;
+ * recovery related fields are under data_lock
+ * protection
+ */
+ u64 bytes_acked;
+ u64 snd_una;
+ u64 wnd_end;
+ u32 last_data_sent;
+ u32 last_data_recv;
+ u32 last_ack_recv;
unsigned long timer_ival;
u32 token;
unsigned long flags;
+ unsigned long cb_flags;
+ bool recovery; /* closing subflow write queue reinjected */
bool can_ack;
- spinlock_t join_list_lock;
+ bool fully_established;
+ bool rcv_data_fin;
+ bool snd_data_fin_enable;
+ bool rcv_fastclose;
+ bool use_64bit_ack; /* Set when we received a 64-bit DSN */
+ bool csum_enabled;
+ bool allow_infinite_fallback;
+ u8 pending_state; /* A subflow asked to set this sk_state,
+ * protected by the msk data lock
+ */
+ u8 mpc_endpoint_id;
+ u8 recvmsg_inq:1,
+ cork:1,
+ nodelay:1,
+ fastopening:1,
+ in_accept_queue:1,
+ free_first:1,
+ rcvspace_init:1;
+ u32 notsent_lowat;
+ int keepalive_cnt;
+ int keepalive_idle;
+ int keepalive_intvl;
+ int maxseg;
struct work_struct work;
+ struct sk_buff *ooo_last_skb;
+ struct rb_root out_of_order_queue;
struct list_head conn_list;
struct list_head rtx_queue;
+ struct mptcp_data_frag *first_pending;
struct list_head join_list;
- struct skb_ext *cached_ext; /* for the next sendmsg */
- struct socket *subflow; /* outgoing connect/listener/!mp_capable */
- struct sock *first;
+ struct sock *first; /* The mptcp ops can safely dereference, using suitable
+ * ONCE annotation, the subflow outside the socket
+ * lock as such sock is freed after close().
+ */
struct mptcp_pm_data pm;
+ struct mptcp_sched_ops *sched;
+ struct {
+ int space; /* bytes copied in last measurement window */
+ int copied; /* bytes copied in this measurement window */
+ u64 time; /* start time of measurement window */
+ u64 rtt_us; /* last maximum rtt of subflows */
+ } rcvq_space;
+ u8 scaling_ratio;
+ bool allow_subflows;
+
+ u32 subflow_id;
+ u32 setsockopt_seq;
+ char ca_name[TCP_CA_NAME_MAX];
+
+ spinlock_t fallback_lock; /* protects fallback,
+ * allow_infinite_fallback and
+ * allow_join
+ */
+
+ struct list_head backlog_list; /* protected by the data lock */
+ u32 backlog_len;
+ u32 backlog_unaccounted;
};
+#define mptcp_data_lock(sk) spin_lock_bh(&(sk)->sk_lock.slock)
+#define mptcp_data_unlock(sk) spin_unlock_bh(&(sk)->sk_lock.slock)
+
#define mptcp_for_each_subflow(__msk, __subflow) \
list_for_each_entry(__subflow, &((__msk)->conn_list), node)
+#define mptcp_for_each_subflow_safe(__msk, __subflow, __tmp) \
+ list_for_each_entry_safe(__subflow, __tmp, &((__msk)->conn_list), node)
+#define mptcp_next_subflow(__msk, __subflow) \
+ list_next_entry_circular(__subflow, &((__msk)->conn_list), node)
+
+extern struct genl_family mptcp_genl_family;
+
+static inline void msk_owned_by_me(const struct mptcp_sock *msk)
+{
+ sock_owned_by_me((const struct sock *)msk);
+}
+
+#ifdef CONFIG_DEBUG_NET
+/* MPTCP-specific: we might (indirectly) call this helper with the wrong sk */
+#undef tcp_sk
+#define tcp_sk(ptr) ({ \
+ typeof(ptr) _ptr = (ptr); \
+ WARN_ON(_ptr->sk_protocol != IPPROTO_TCP); \
+ container_of_const(_ptr, struct tcp_sock, inet_conn.icsk_inet.sk); \
+})
+#define mptcp_sk(ptr) ({ \
+ typeof(ptr) _ptr = (ptr); \
+ WARN_ON(_ptr->sk_protocol != IPPROTO_MPTCP); \
+ container_of_const(_ptr, struct mptcp_sock, sk.icsk_inet.sk); \
+})
+
+#else /* !CONFIG_DEBUG_NET */
+#define mptcp_sk(ptr) container_of_const(ptr, struct mptcp_sock, sk.icsk_inet.sk)
+#endif
-static inline struct mptcp_sock *mptcp_sk(const struct sock *sk)
+static inline int mptcp_win_from_space(const struct sock *sk, int space)
{
- return (struct mptcp_sock *)sk;
+ return __tcp_win_from_space(mptcp_sk(sk)->scaling_ratio, space);
}
-static inline struct mptcp_data_frag *mptcp_rtx_tail(const struct sock *sk)
+static inline int mptcp_space_from_win(const struct sock *sk, int win)
+{
+ return __tcp_space_from_win(mptcp_sk(sk)->scaling_ratio, win);
+}
+
+static inline int __mptcp_space(const struct sock *sk)
+{
+ return mptcp_win_from_space(sk, READ_ONCE(sk->sk_rcvbuf) -
+ READ_ONCE(mptcp_sk(sk)->backlog_len) -
+ sk_rmem_alloc_get(sk));
+}
+
+static inline struct mptcp_data_frag *mptcp_send_head(const struct sock *sk)
+{
+ const struct mptcp_sock *msk = mptcp_sk(sk);
+
+ return msk->first_pending;
+}
+
+static inline struct mptcp_data_frag *mptcp_send_next(struct sock *sk)
{
struct mptcp_sock *msk = mptcp_sk(sk);
+ struct mptcp_data_frag *cur;
+
+ cur = msk->first_pending;
+ return list_is_last(&cur->list, &msk->rtx_queue) ? NULL :
+ list_next_entry(cur, list);
+}
+
+static inline struct mptcp_data_frag *mptcp_pending_tail(const struct sock *sk)
+{
+ const struct mptcp_sock *msk = mptcp_sk(sk);
- if (list_empty(&msk->rtx_queue))
+ if (!msk->first_pending)
+ return NULL;
+
+ if (WARN_ON_ONCE(list_empty(&msk->rtx_queue)))
return NULL;
return list_last_entry(&msk->rtx_queue, struct mptcp_data_frag, list);
}
-static inline struct mptcp_data_frag *mptcp_rtx_head(const struct sock *sk)
+static inline struct mptcp_data_frag *mptcp_rtx_head(struct sock *sk)
{
struct mptcp_sock *msk = mptcp_sk(sk);
- if (list_empty(&msk->rtx_queue))
+ if (msk->snd_una == msk->snd_nxt)
return NULL;
- return list_first_entry(&msk->rtx_queue, struct mptcp_data_frag, list);
+ return list_first_entry_or_null(&msk->rtx_queue, struct mptcp_data_frag, list);
}
+struct csum_pseudo_header {
+ __be64 data_seq;
+ __be32 subflow_seq;
+ __be16 data_len;
+ __sum16 csum;
+};
+
struct mptcp_subflow_request_sock {
struct tcp_request_sock sk;
u16 mp_capable : 1,
mp_join : 1,
- backup : 1;
+ backup : 1,
+ request_bkup : 1,
+ csum_reqd : 1,
+ allow_join_id0 : 1;
u8 local_id;
u8 remote_id;
u64 local_key;
@@ -254,6 +478,8 @@ struct mptcp_subflow_request_sock {
u64 thmac;
u32 local_nonce;
u32 remote_nonce;
+ struct mptcp_sock *msk;
+ struct hlist_nulls_node token_node;
};
static inline struct mptcp_subflow_request_sock *
@@ -262,50 +488,105 @@ mptcp_subflow_rsk(const struct request_sock *rsk)
return (struct mptcp_subflow_request_sock *)rsk;
}
+struct mptcp_delegated_action {
+ struct napi_struct napi;
+ local_lock_t bh_lock;
+ struct list_head head;
+};
+
+DECLARE_PER_CPU(struct mptcp_delegated_action, mptcp_delegated_actions);
+
+#define MPTCP_DELEGATE_SCHEDULED 0
+#define MPTCP_DELEGATE_SEND 1
+#define MPTCP_DELEGATE_ACK 2
+#define MPTCP_DELEGATE_SNDBUF 3
+
+#define MPTCP_DELEGATE_ACTIONS_MASK (~BIT(MPTCP_DELEGATE_SCHEDULED))
/* MPTCP subflow context */
struct mptcp_subflow_context {
struct list_head node;/* conn_list of subflows */
+
+ struct_group(reset,
+
+ unsigned long avg_pacing_rate; /* protected by msk socket lock */
u64 local_key;
u64 remote_key;
u64 idsn;
u64 map_seq;
+ u64 rcv_wnd_sent;
u32 snd_isn;
u32 token;
u32 rel_write_seq;
u32 map_subflow_seq;
u32 ssn_offset;
u32 map_data_len;
+ __wsum map_data_csum;
+ u32 map_csum_len;
u32 request_mptcp : 1, /* send MP_CAPABLE */
request_join : 1, /* send MP_JOIN */
request_bkup : 1,
mp_capable : 1, /* remote is MPTCP capable */
mp_join : 1, /* remote is JOINing */
- fully_established : 1, /* path validated */
pm_notified : 1, /* PM hook called for established status */
conn_finished : 1,
map_valid : 1,
+ map_csum_reqd : 1,
+ map_data_fin : 1,
mpc_map : 1,
backup : 1,
- data_avail : 1,
- rx_eof : 1,
- data_fin_tx_enable : 1,
- use_64bit_ack : 1, /* Set when we received a 64-bit DSN */
- can_ack : 1; /* only after processing the remote a key */
- u64 data_fin_tx_seq;
+ send_mp_prio : 1,
+ send_mp_fail : 1,
+ send_fastclose : 1,
+ send_infinite_map : 1,
+ remote_key_valid : 1, /* received the peer key from */
+ disposable : 1, /* ctx can be free at ulp release time */
+ closing : 1, /* must not pass rx data to msk anymore */
+ stale : 1, /* unable to snd/rcv data, do not use for xmit */
+ valid_csum_seen : 1, /* at least one csum validated */
+ is_mptfo : 1, /* subflow is doing TFO */
+ close_event_done : 1, /* has done the post-closed part */
+ mpc_drop : 1, /* the MPC option has been dropped in a rtx */
+ __unused : 8;
+ bool data_avail;
+ bool scheduled;
+ bool pm_listener; /* a listener managed by the kernel PM? */
+ bool fully_established; /* path validated */
+ u32 lent_mem_frag;
u32 remote_nonce;
u64 thmac;
u32 local_nonce;
u32 remote_token;
- u8 hmac[MPTCPOPT_HMAC_LEN];
- u8 local_id;
+ union {
+ u8 hmac[MPTCPOPT_HMAC_LEN]; /* MPJ subflow only */
+ u64 iasn; /* initial ack sequence number, MPC subflows only */
+ };
+ s16 local_id; /* if negative not initialized yet */
u8 remote_id;
+ u8 reset_seen:1;
+ u8 reset_transient:1;
+ u8 reset_reason:4;
+ u8 stale_count;
+
+ u32 subflow_id;
+
+ long delegated_status;
+ unsigned long fail_tout;
+
+ );
+
+ struct list_head delegated_node; /* link into delegated_action, protected by local BH */
+
+ u32 setsockopt_seq;
+ u32 stale_rcv_tstamp;
+ int cached_sndbuf; /* sndbuf size when last synced with the msk sndbuf,
+ * protected by the msk socket lock
+ */
struct sock *tcp_sock; /* tcp sk backpointer */
struct sock *conn; /* parent mptcp_sock */
const struct inet_connection_sock_af_ops *icsk_af_ops;
- void (*tcp_data_ready)(struct sock *sk);
void (*tcp_state_change)(struct sock *sk);
- void (*tcp_write_space)(struct sock *sk);
+ void (*tcp_error_report)(struct sock *sk);
struct rcu_head rcu;
};
@@ -313,7 +594,7 @@ struct mptcp_subflow_context {
static inline struct mptcp_subflow_context *
mptcp_subflow_ctx(const struct sock *sk)
{
- struct inet_connection_sock *icsk = inet_csk(sk);
+ const struct inet_connection_sock *icsk = inet_csk(sk);
/* Use RCU on icsk_ulp_data only for sock diag code */
return (__force struct mptcp_subflow_context *)icsk->icsk_ulp_data;
@@ -325,6 +606,87 @@ mptcp_subflow_tcp_sock(const struct mptcp_subflow_context *subflow)
return subflow->tcp_sock;
}
+static inline void
+mptcp_subflow_ctx_reset(struct mptcp_subflow_context *subflow)
+{
+ memset(&subflow->reset, 0, sizeof(subflow->reset));
+ subflow->request_mptcp = 1;
+ WRITE_ONCE(subflow->local_id, -1);
+}
+
+/* Convert reset reasons in MPTCP to enum sk_rst_reason type */
+static inline enum sk_rst_reason
+sk_rst_convert_mptcp_reason(u32 reason)
+{
+ switch (reason) {
+ case MPTCP_RST_EUNSPEC:
+ return SK_RST_REASON_MPTCP_RST_EUNSPEC;
+ case MPTCP_RST_EMPTCP:
+ return SK_RST_REASON_MPTCP_RST_EMPTCP;
+ case MPTCP_RST_ERESOURCE:
+ return SK_RST_REASON_MPTCP_RST_ERESOURCE;
+ case MPTCP_RST_EPROHIBIT:
+ return SK_RST_REASON_MPTCP_RST_EPROHIBIT;
+ case MPTCP_RST_EWQ2BIG:
+ return SK_RST_REASON_MPTCP_RST_EWQ2BIG;
+ case MPTCP_RST_EBADPERF:
+ return SK_RST_REASON_MPTCP_RST_EBADPERF;
+ case MPTCP_RST_EMIDDLEBOX:
+ return SK_RST_REASON_MPTCP_RST_EMIDDLEBOX;
+ default:
+ /* It should not happen, or else errors may occur
+ * in MPTCP layer
+ */
+ return SK_RST_REASON_ERROR;
+ }
+}
+
+static inline void
+mptcp_send_active_reset_reason(struct sock *sk)
+{
+ struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
+ enum sk_rst_reason reason;
+
+ reason = sk_rst_convert_mptcp_reason(subflow->reset_reason);
+ tcp_send_active_reset(sk, GFP_ATOMIC, reason);
+}
+
+/* Made the fwd mem carried by the given skb available to the msk,
+ * To be paired with a previous mptcp_subflow_lend_fwdmem() before freeing
+ * the skb or setting the skb ownership.
+ */
+static inline void mptcp_borrow_fwdmem(struct sock *sk, struct sk_buff *skb)
+{
+ struct sock *ssk = skb->sk;
+
+ /* The subflow just lend the skb fwd memory; if the subflow meanwhile
+ * closed, mptcp_close_ssk() already released the ssk rcv memory.
+ */
+ DEBUG_NET_WARN_ON_ONCE(skb->destructor);
+ sk_forward_alloc_add(sk, skb->truesize);
+ if (!ssk)
+ return;
+
+ atomic_sub(skb->truesize, &ssk->sk_rmem_alloc);
+ skb->sk = NULL;
+}
+
+static inline void
+__mptcp_subflow_lend_fwdmem(struct mptcp_subflow_context *subflow, int size)
+{
+ int frag = (subflow->lent_mem_frag + size) & (PAGE_SIZE - 1);
+
+ subflow->lent_mem_frag = frag;
+}
+
+static inline void
+mptcp_subflow_lend_fwdmem(struct mptcp_subflow_context *subflow,
+ struct sk_buff *skb)
+{
+ __mptcp_subflow_lend_fwdmem(subflow, skb->truesize);
+ skb->destructor = NULL;
+}
+
static inline u64
mptcp_subflow_get_map_offset(const struct mptcp_subflow_context *subflow)
{
@@ -339,123 +701,666 @@ mptcp_subflow_get_mapped_dsn(const struct mptcp_subflow_context *subflow)
return subflow->map_seq + mptcp_subflow_get_map_offset(subflow);
}
-int mptcp_is_enabled(struct net *net);
+void mptcp_subflow_process_delegated(struct sock *ssk, long actions);
+
+static inline void mptcp_subflow_delegate(struct mptcp_subflow_context *subflow, int action)
+{
+ long old, set_bits = BIT(MPTCP_DELEGATE_SCHEDULED) | BIT(action);
+ struct mptcp_delegated_action *delegated;
+ bool schedule;
+
+ /* the caller held the subflow bh socket lock */
+ lockdep_assert_in_softirq();
+
+ /* The implied barrier pairs with tcp_release_cb_override()
+ * mptcp_napi_poll(), and ensures the below list check sees list
+ * updates done prior to delegated status bits changes
+ */
+ old = set_mask_bits(&subflow->delegated_status, 0, set_bits);
+ if (!(old & BIT(MPTCP_DELEGATE_SCHEDULED))) {
+ if (WARN_ON_ONCE(!list_empty(&subflow->delegated_node)))
+ return;
+
+ local_lock_nested_bh(&mptcp_delegated_actions.bh_lock);
+ delegated = this_cpu_ptr(&mptcp_delegated_actions);
+ schedule = list_empty(&delegated->head);
+ list_add_tail(&subflow->delegated_node, &delegated->head);
+ local_unlock_nested_bh(&mptcp_delegated_actions.bh_lock);
+ sock_hold(mptcp_subflow_tcp_sock(subflow));
+ if (schedule)
+ napi_schedule(&delegated->napi);
+ }
+}
+
+static inline struct mptcp_subflow_context *
+mptcp_subflow_delegated_next(struct mptcp_delegated_action *delegated)
+{
+ struct mptcp_subflow_context *ret;
+
+ local_lock_nested_bh(&mptcp_delegated_actions.bh_lock);
+ if (list_empty(&delegated->head)) {
+ local_unlock_nested_bh(&mptcp_delegated_actions.bh_lock);
+ return NULL;
+ }
+
+ ret = list_first_entry(&delegated->head, struct mptcp_subflow_context, delegated_node);
+ list_del_init(&ret->delegated_node);
+ local_unlock_nested_bh(&mptcp_delegated_actions.bh_lock);
+ return ret;
+}
+
+void __mptcp_inherit_memcg(struct sock *sk, struct sock *ssk, gfp_t gfp);
+void __mptcp_inherit_cgrp_data(struct sock *sk, struct sock *ssk);
+
+int mptcp_is_enabled(const struct net *net);
+unsigned int mptcp_get_add_addr_timeout(const struct net *net);
+int mptcp_is_checksum_enabled(const struct net *net);
+int mptcp_allow_join_id0(const struct net *net);
+unsigned int mptcp_stale_loss_cnt(const struct net *net);
+unsigned int mptcp_close_timeout(const struct sock *sk);
+int mptcp_get_pm_type(const struct net *net);
+const char *mptcp_get_path_manager(const struct net *net);
+const char *mptcp_get_scheduler(const struct net *net);
+
+void mptcp_active_disable(struct sock *sk);
+bool mptcp_active_should_disable(struct sock *ssk);
+void mptcp_active_enable(struct sock *sk);
+
+void mptcp_get_available_schedulers(char *buf, size_t maxlen);
+void __mptcp_subflow_fully_established(struct mptcp_sock *msk,
+ struct mptcp_subflow_context *subflow,
+ const struct mptcp_options_received *mp_opt);
+bool __mptcp_retransmit_pending_data(struct sock *sk);
+void mptcp_check_and_set_pending(struct sock *sk);
+void __mptcp_push_pending(struct sock *sk, unsigned int flags);
bool mptcp_subflow_data_available(struct sock *sk);
-void mptcp_subflow_init(void);
+void __init mptcp_subflow_init(void);
+void mptcp_subflow_shutdown(struct sock *sk, struct sock *ssk, int how);
+void mptcp_close_ssk(struct sock *sk, struct sock *ssk,
+ struct mptcp_subflow_context *subflow);
+void __mptcp_subflow_send_ack(struct sock *ssk);
+void mptcp_subflow_reset(struct sock *ssk);
+void mptcp_subflow_queue_clean(struct sock *sk, struct sock *ssk);
+void mptcp_sock_graft(struct sock *sk, struct socket *parent);
+struct sock *__mptcp_nmpc_sk(struct mptcp_sock *msk);
+bool __mptcp_close(struct sock *sk, long timeout);
+void mptcp_cancel_work(struct sock *sk);
+void __mptcp_unaccepted_force_close(struct sock *sk);
+void mptcp_set_state(struct sock *sk, int state);
+
+bool mptcp_addresses_equal(const struct mptcp_addr_info *a,
+ const struct mptcp_addr_info *b, bool use_port);
+void mptcp_local_address(const struct sock_common *skc,
+ struct mptcp_addr_info *addr);
+void mptcp_remote_address(const struct sock_common *skc,
+ struct mptcp_addr_info *addr);
/* called with sk socket lock held */
-int __mptcp_subflow_connect(struct sock *sk, int ifindex,
- const struct mptcp_addr_info *loc,
+int __mptcp_subflow_connect(struct sock *sk, const struct mptcp_pm_local *local,
const struct mptcp_addr_info *remote);
-int mptcp_subflow_create_socket(struct sock *sk, struct socket **new_sock);
+int mptcp_subflow_create_socket(struct sock *sk, unsigned short family,
+ struct socket **new_sock);
+void mptcp_info2sockaddr(const struct mptcp_addr_info *info,
+ struct sockaddr_storage *addr,
+ unsigned short family);
+struct mptcp_sched_ops *mptcp_sched_find(const char *name);
+int mptcp_validate_scheduler(struct mptcp_sched_ops *sched);
+int mptcp_register_scheduler(struct mptcp_sched_ops *sched);
+void mptcp_unregister_scheduler(struct mptcp_sched_ops *sched);
+void mptcp_sched_init(void);
+int mptcp_init_sched(struct mptcp_sock *msk,
+ struct mptcp_sched_ops *sched);
+void mptcp_release_sched(struct mptcp_sock *msk);
+void mptcp_subflow_set_scheduled(struct mptcp_subflow_context *subflow,
+ bool scheduled);
+struct sock *mptcp_subflow_get_send(struct mptcp_sock *msk);
+struct sock *mptcp_subflow_get_retrans(struct mptcp_sock *msk);
+int mptcp_sched_get_send(struct mptcp_sock *msk);
+int mptcp_sched_get_retrans(struct mptcp_sock *msk);
+
+static inline u64 mptcp_data_avail(const struct mptcp_sock *msk)
+{
+ return READ_ONCE(msk->bytes_received) - READ_ONCE(msk->bytes_consumed);
+}
+
+static inline bool mptcp_epollin_ready(const struct sock *sk)
+{
+ u64 data_avail = mptcp_data_avail(mptcp_sk(sk));
+
+ if (!data_avail)
+ return false;
+
+ /* mptcp doesn't have to deal with small skbs in the receive queue,
+ * as it can always coalesce them
+ */
+ return (data_avail >= sk->sk_rcvlowat) ||
+ tcp_under_memory_pressure(sk);
+}
+
+int mptcp_set_rcvlowat(struct sock *sk, int val);
+
+static inline bool __tcp_can_send(const struct sock *ssk)
+{
+ /* only send if our side has not closed yet */
+ return ((1 << inet_sk_state_load(ssk)) & (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT));
+}
+
+static inline bool __mptcp_subflow_active(struct mptcp_subflow_context *subflow)
+{
+ /* can't send if JOIN hasn't completed yet (i.e. is usable for mptcp) */
+ if (subflow->request_join && !READ_ONCE(subflow->fully_established))
+ return false;
+
+ return __tcp_can_send(mptcp_subflow_tcp_sock(subflow));
+}
+
+void mptcp_subflow_set_active(struct mptcp_subflow_context *subflow);
+
+bool mptcp_subflow_active(struct mptcp_subflow_context *subflow);
+
+void mptcp_subflow_drop_ctx(struct sock *ssk);
static inline void mptcp_subflow_tcp_fallback(struct sock *sk,
struct mptcp_subflow_context *ctx)
{
- sk->sk_data_ready = ctx->tcp_data_ready;
+ sk->sk_data_ready = sock_def_readable;
sk->sk_state_change = ctx->tcp_state_change;
- sk->sk_write_space = ctx->tcp_write_space;
+ sk->sk_write_space = sk_stream_write_space;
+ sk->sk_error_report = ctx->tcp_error_report;
inet_csk(sk)->icsk_af_ops = ctx->icsk_af_ops;
}
-extern const struct inet_connection_sock_af_ops ipv4_specific;
+void __init mptcp_proto_init(void);
#if IS_ENABLED(CONFIG_MPTCP_IPV6)
-extern const struct inet_connection_sock_af_ops ipv6_specific;
+int __init mptcp_proto_v6_init(void);
#endif
-void mptcp_proto_init(void);
-#if IS_ENABLED(CONFIG_MPTCP_IPV6)
-int mptcp_proto_v6_init(void);
-#endif
-
-struct sock *mptcp_sk_clone(const struct sock *sk,
- const struct mptcp_options_received *mp_opt,
- struct request_sock *req);
+struct sock *mptcp_sk_clone_init(const struct sock *sk,
+ const struct mptcp_options_received *mp_opt,
+ struct sock *ssk,
+ struct request_sock *req);
void mptcp_get_options(const struct sk_buff *skb,
struct mptcp_options_received *mp_opt);
void mptcp_finish_connect(struct sock *sk);
+void __mptcp_sync_state(struct sock *sk, int state);
+void mptcp_reset_tout_timer(struct mptcp_sock *msk, unsigned long fail_tout);
+
+static inline void mptcp_stop_tout_timer(struct sock *sk)
+{
+ if (!inet_csk(sk)->icsk_mtup.probe_timestamp)
+ return;
+
+ sk_stop_timer(sk, &inet_csk(sk)->mptcp_tout_timer);
+ inet_csk(sk)->icsk_mtup.probe_timestamp = 0;
+}
+
+static inline void mptcp_set_close_tout(struct sock *sk, unsigned long tout)
+{
+ /* avoid 0 timestamp, as that means no close timeout */
+ inet_csk(sk)->icsk_mtup.probe_timestamp = tout ? : 1;
+}
+
+static inline void mptcp_start_tout_timer(struct sock *sk)
+{
+ mptcp_set_close_tout(sk, tcp_jiffies32);
+ mptcp_reset_tout_timer(mptcp_sk(sk), 0);
+}
+
+static inline bool mptcp_is_fully_established(struct sock *sk)
+{
+ return inet_sk_state_load(sk) == TCP_ESTABLISHED &&
+ READ_ONCE(mptcp_sk(sk)->fully_established);
+}
+
+void mptcp_rcv_space_init(struct mptcp_sock *msk, const struct sock *ssk);
void mptcp_data_ready(struct sock *sk, struct sock *ssk);
bool mptcp_finish_join(struct sock *sk);
-void mptcp_data_acked(struct sock *sk);
-void mptcp_subflow_eof(struct sock *sk);
+bool mptcp_schedule_work(struct sock *sk);
+int mptcp_setsockopt(struct sock *sk, int level, int optname,
+ sockptr_t optval, unsigned int optlen);
+int mptcp_getsockopt(struct sock *sk, int level, int optname,
+ char __user *optval, int __user *option);
-int mptcp_token_new_request(struct request_sock *req);
-void mptcp_token_destroy_request(u32 token);
-int mptcp_token_new_connect(struct sock *sk);
-int mptcp_token_new_accept(u32 token, struct sock *conn);
-struct mptcp_sock *mptcp_token_get_sock(u32 token);
-void mptcp_token_destroy(u32 token);
+u64 __mptcp_expand_seq(u64 old_seq, u64 cur_seq);
+static inline u64 mptcp_expand_seq(u64 old_seq, u64 cur_seq, bool use_64bit)
+{
+ if (use_64bit)
+ return cur_seq;
-void mptcp_crypto_key_sha(u64 key, u32 *token, u64 *idsn);
-static inline void mptcp_crypto_key_gen_sha(u64 *key, u32 *token, u64 *idsn)
+ return __mptcp_expand_seq(old_seq, cur_seq);
+}
+void __mptcp_check_push(struct sock *sk, struct sock *ssk);
+void __mptcp_data_acked(struct sock *sk);
+void __mptcp_error_report(struct sock *sk);
+bool mptcp_update_rcv_data_fin(struct mptcp_sock *msk, u64 data_fin_seq, bool use_64bit);
+static inline bool mptcp_data_fin_enabled(const struct mptcp_sock *msk)
{
- /* we might consider a faster version that computes the key as a
- * hash of some information available in the MPTCP socket. Use
- * random data at the moment, as it's probably the safest option
- * in case multiple sockets are opened in different namespaces at
- * the same time.
- */
- get_random_bytes(key, sizeof(u64));
- mptcp_crypto_key_sha(*key, token, idsn);
+ return READ_ONCE(msk->snd_data_fin_enable) &&
+ READ_ONCE(msk->write_seq) == READ_ONCE(msk->snd_nxt);
+}
+
+static inline u32 mptcp_notsent_lowat(const struct sock *sk)
+{
+ struct net *net = sock_net(sk);
+ u32 val;
+
+ val = READ_ONCE(mptcp_sk(sk)->notsent_lowat);
+ return val ?: READ_ONCE(net->ipv4.sysctl_tcp_notsent_lowat);
+}
+
+static inline bool mptcp_stream_memory_free(const struct sock *sk, int wake)
+{
+ const struct mptcp_sock *msk = mptcp_sk(sk);
+ u32 notsent_bytes;
+
+ notsent_bytes = READ_ONCE(msk->write_seq) - READ_ONCE(msk->snd_nxt);
+ return (notsent_bytes << wake) < mptcp_notsent_lowat(sk);
+}
+
+static inline bool __mptcp_stream_is_writeable(const struct sock *sk, int wake)
+{
+ return mptcp_stream_memory_free(sk, wake) &&
+ __sk_stream_is_writeable(sk, wake);
+}
+
+static inline void mptcp_write_space(struct sock *sk)
+{
+ /* pairs with memory barrier in mptcp_poll */
+ smp_mb();
+ if (mptcp_stream_memory_free(sk, 1))
+ sk_stream_write_space(sk);
}
+static inline void __mptcp_sync_sndbuf(struct sock *sk)
+{
+ struct mptcp_subflow_context *subflow;
+ int ssk_sndbuf, new_sndbuf;
+
+ if (sk->sk_userlocks & SOCK_SNDBUF_LOCK)
+ return;
+
+ new_sndbuf = READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_wmem[0]);
+ mptcp_for_each_subflow(mptcp_sk(sk), subflow) {
+ ssk_sndbuf = READ_ONCE(mptcp_subflow_tcp_sock(subflow)->sk_sndbuf);
+
+ subflow->cached_sndbuf = ssk_sndbuf;
+ new_sndbuf += ssk_sndbuf;
+ }
+
+ /* the msk max wmem limit is <nr_subflows> * tcp wmem[2] */
+ WRITE_ONCE(sk->sk_sndbuf, new_sndbuf);
+ mptcp_write_space(sk);
+}
+
+/* The called held both the msk socket and the subflow socket locks,
+ * possibly under BH
+ */
+static inline void __mptcp_propagate_sndbuf(struct sock *sk, struct sock *ssk)
+{
+ struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk);
+
+ if (READ_ONCE(ssk->sk_sndbuf) != subflow->cached_sndbuf)
+ __mptcp_sync_sndbuf(sk);
+}
+
+/* the caller held only the subflow socket lock, either in process or
+ * BH context. Additionally this can be called under the msk data lock,
+ * so we can't acquire such lock here: let the delegate action acquires
+ * the needed locks in suitable order.
+ */
+static inline void mptcp_propagate_sndbuf(struct sock *sk, struct sock *ssk)
+{
+ struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk);
+
+ if (likely(READ_ONCE(ssk->sk_sndbuf) == subflow->cached_sndbuf))
+ return;
+
+ local_bh_disable();
+ mptcp_subflow_delegate(subflow, MPTCP_DELEGATE_SNDBUF);
+ local_bh_enable();
+}
+
+#define MPTCP_TOKEN_MAX_RETRIES 4
+
+void __init mptcp_token_init(void);
+static inline void mptcp_token_init_request(struct request_sock *req)
+{
+ mptcp_subflow_rsk(req)->token_node.pprev = NULL;
+}
+
+int mptcp_token_new_request(struct request_sock *req);
+void mptcp_token_destroy_request(struct request_sock *req);
+int mptcp_token_new_connect(struct sock *ssk);
+void mptcp_token_accept(struct mptcp_subflow_request_sock *r,
+ struct mptcp_sock *msk);
+bool mptcp_token_exists(u32 token);
+struct mptcp_sock *mptcp_token_get_sock(struct net *net, u32 token);
+struct mptcp_sock *mptcp_token_iter_next(const struct net *net, long *s_slot,
+ long *s_num);
+void mptcp_token_destroy(struct mptcp_sock *msk);
+
+void mptcp_crypto_key_sha(u64 key, u32 *token, u64 *idsn);
+
void mptcp_crypto_hmac_sha(u64 key1, u64 key2, u8 *msg, int len, void *hmac);
+__sum16 __mptcp_make_csum(u64 data_seq, u32 subflow_seq, u16 data_len, __wsum sum);
-void mptcp_pm_init(void);
+void __init mptcp_pm_init(void);
void mptcp_pm_data_init(struct mptcp_sock *msk);
-void mptcp_pm_close(struct mptcp_sock *msk);
-void mptcp_pm_new_connection(struct mptcp_sock *msk, int server_side);
-void mptcp_pm_fully_established(struct mptcp_sock *msk);
+void mptcp_pm_data_reset(struct mptcp_sock *msk);
+void mptcp_pm_destroy(struct mptcp_sock *msk);
+int mptcp_pm_parse_addr(struct nlattr *attr, struct genl_info *info,
+ struct mptcp_addr_info *addr);
+int mptcp_pm_parse_entry(struct nlattr *attr, struct genl_info *info,
+ bool require_family,
+ struct mptcp_pm_addr_entry *entry);
+bool mptcp_pm_addr_families_match(const struct sock *sk,
+ const struct mptcp_addr_info *loc,
+ const struct mptcp_addr_info *rem);
+void mptcp_pm_subflow_chk_stale(const struct mptcp_sock *msk, struct sock *ssk);
+void mptcp_pm_new_connection(struct mptcp_sock *msk, const struct sock *ssk, int server_side);
+void mptcp_pm_fully_established(struct mptcp_sock *msk, const struct sock *ssk);
bool mptcp_pm_allow_new_subflow(struct mptcp_sock *msk);
void mptcp_pm_connection_closed(struct mptcp_sock *msk);
-void mptcp_pm_subflow_established(struct mptcp_sock *msk,
- struct mptcp_subflow_context *subflow);
-void mptcp_pm_subflow_closed(struct mptcp_sock *msk, u8 id);
-void mptcp_pm_add_addr_received(struct mptcp_sock *msk,
+void mptcp_pm_subflow_established(struct mptcp_sock *msk);
+bool mptcp_pm_nl_check_work_pending(struct mptcp_sock *msk);
+void mptcp_pm_subflow_check_next(struct mptcp_sock *msk,
+ const struct mptcp_subflow_context *subflow);
+void mptcp_pm_add_addr_received(const struct sock *ssk,
const struct mptcp_addr_info *addr);
-
+void mptcp_pm_add_addr_echoed(struct mptcp_sock *msk,
+ const struct mptcp_addr_info *addr);
+void mptcp_pm_add_addr_send_ack(struct mptcp_sock *msk);
+void mptcp_pm_send_ack(struct mptcp_sock *msk,
+ struct mptcp_subflow_context *subflow,
+ bool prio, bool backup);
+void mptcp_pm_addr_send_ack(struct mptcp_sock *msk);
+void mptcp_pm_nl_rm_addr(struct mptcp_sock *msk, u8 rm_id);
+void mptcp_pm_rm_subflow(struct mptcp_sock *msk,
+ const struct mptcp_rm_list *rm_list);
+void mptcp_pm_rm_addr_received(struct mptcp_sock *msk,
+ const struct mptcp_rm_list *rm_list);
+void mptcp_pm_mp_prio_received(struct sock *sk, u8 bkup);
+void mptcp_pm_mp_fail_received(struct sock *sk, u64 fail_seq);
+int mptcp_pm_mp_prio_send_ack(struct mptcp_sock *msk,
+ struct mptcp_addr_info *addr,
+ struct mptcp_addr_info *rem,
+ u8 bkup);
+bool mptcp_pm_alloc_anno_list(struct mptcp_sock *msk,
+ const struct mptcp_addr_info *addr);
+bool mptcp_pm_sport_in_anno_list(struct mptcp_sock *msk, const struct sock *sk);
+struct mptcp_pm_add_entry *
+mptcp_pm_del_add_timer(struct mptcp_sock *msk,
+ const struct mptcp_addr_info *addr, bool check_id);
+bool mptcp_lookup_subflow_by_saddr(const struct list_head *list,
+ const struct mptcp_addr_info *saddr);
+bool mptcp_remove_anno_list_by_saddr(struct mptcp_sock *msk,
+ const struct mptcp_addr_info *addr);
+int mptcp_pm_nl_set_flags(struct mptcp_pm_addr_entry *local,
+ struct genl_info *info);
+int mptcp_userspace_pm_set_flags(struct mptcp_pm_addr_entry *local,
+ struct genl_info *info);
int mptcp_pm_announce_addr(struct mptcp_sock *msk,
- const struct mptcp_addr_info *addr);
-int mptcp_pm_remove_addr(struct mptcp_sock *msk, u8 local_id);
-int mptcp_pm_remove_subflow(struct mptcp_sock *msk, u8 remote_id);
+ const struct mptcp_addr_info *addr,
+ bool echo);
+int mptcp_pm_remove_addr(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list);
+void mptcp_pm_remove_addr_entry(struct mptcp_sock *msk,
+ struct mptcp_pm_addr_entry *entry);
+
+/* the default path manager, used in mptcp_pm_unregister */
+extern struct mptcp_pm_ops mptcp_pm_kernel;
+
+struct mptcp_pm_ops *mptcp_pm_find(const char *name);
+int mptcp_pm_register(struct mptcp_pm_ops *pm_ops);
+void mptcp_pm_unregister(struct mptcp_pm_ops *pm_ops);
+int mptcp_pm_validate(struct mptcp_pm_ops *pm_ops);
+void mptcp_pm_get_available(char *buf, size_t maxlen);
+
+void mptcp_userspace_pm_free_local_addr_list(struct mptcp_sock *msk);
+
+void mptcp_event(enum mptcp_event_type type, const struct mptcp_sock *msk,
+ const struct sock *ssk, gfp_t gfp);
+void mptcp_event_addr_announced(const struct sock *ssk, const struct mptcp_addr_info *info);
+void mptcp_event_addr_removed(const struct mptcp_sock *msk, u8 id);
+void mptcp_event_pm_listener(const struct sock *ssk,
+ enum mptcp_event_type event);
+bool mptcp_userspace_pm_active(const struct mptcp_sock *msk);
+
+void mptcp_fastopen_subflow_synack_set_params(struct mptcp_subflow_context *subflow,
+ struct request_sock *req);
+int mptcp_pm_genl_fill_addr(struct sk_buff *msg,
+ struct netlink_callback *cb,
+ struct mptcp_pm_addr_entry *entry);
-static inline bool mptcp_pm_should_signal(struct mptcp_sock *msk)
+static inline bool mptcp_pm_should_add_signal(struct mptcp_sock *msk)
{
- return READ_ONCE(msk->pm.addr_signal);
+ return READ_ONCE(msk->pm.addr_signal) &
+ (BIT(MPTCP_ADD_ADDR_SIGNAL) | BIT(MPTCP_ADD_ADDR_ECHO));
}
-static inline unsigned int mptcp_add_addr_len(int family)
+static inline bool mptcp_pm_should_add_signal_addr(struct mptcp_sock *msk)
{
- if (family == AF_INET)
- return TCPOLEN_MPTCP_ADD_ADDR;
- return TCPOLEN_MPTCP_ADD_ADDR6;
+ return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_SIGNAL);
}
-bool mptcp_pm_addr_signal(struct mptcp_sock *msk, unsigned int remaining,
- struct mptcp_addr_info *saddr);
+static inline bool mptcp_pm_should_add_signal_echo(struct mptcp_sock *msk)
+{
+ return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_ECHO);
+}
+
+static inline bool mptcp_pm_should_rm_signal(struct mptcp_sock *msk)
+{
+ return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_RM_ADDR_SIGNAL);
+}
+
+static inline bool mptcp_pm_is_userspace(const struct mptcp_sock *msk)
+{
+ return READ_ONCE(msk->pm.pm_type) == MPTCP_PM_TYPE_USERSPACE;
+}
+
+static inline bool mptcp_pm_is_kernel(const struct mptcp_sock *msk)
+{
+ return READ_ONCE(msk->pm.pm_type) == MPTCP_PM_TYPE_KERNEL;
+}
+
+static inline unsigned int mptcp_add_addr_len(int family, bool echo, bool port)
+{
+ u8 len = TCPOLEN_MPTCP_ADD_ADDR_BASE;
+
+ if (family == AF_INET6)
+ len = TCPOLEN_MPTCP_ADD_ADDR6_BASE;
+ if (!echo)
+ len += MPTCPOPT_THMAC_LEN;
+ /* account for 2 trailing 'nop' options */
+ if (port)
+ len += TCPOLEN_MPTCP_PORT_LEN + TCPOLEN_MPTCP_PORT_ALIGN;
+
+ return len;
+}
+
+static inline int mptcp_rm_addr_len(const struct mptcp_rm_list *rm_list)
+{
+ if (rm_list->nr == 0 || rm_list->nr > MPTCP_RM_IDS_MAX)
+ return -EINVAL;
+
+ return TCPOLEN_MPTCP_RM_ADDR_BASE + roundup(rm_list->nr - 1, 4) + 1;
+}
+
+bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, const struct sk_buff *skb,
+ unsigned int opt_size, unsigned int remaining,
+ struct mptcp_addr_info *addr, bool *echo,
+ bool *drop_other_suboptions);
+bool mptcp_pm_rm_addr_signal(struct mptcp_sock *msk, unsigned int remaining,
+ struct mptcp_rm_list *rm_list);
int mptcp_pm_get_local_id(struct mptcp_sock *msk, struct sock_common *skc);
+int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk,
+ struct mptcp_pm_addr_entry *skc);
+int mptcp_userspace_pm_get_local_id(struct mptcp_sock *msk,
+ struct mptcp_pm_addr_entry *skc);
+bool mptcp_pm_is_backup(struct mptcp_sock *msk, struct sock_common *skc);
+bool mptcp_pm_nl_is_backup(struct mptcp_sock *msk, struct mptcp_addr_info *skc);
+bool mptcp_userspace_pm_is_backup(struct mptcp_sock *msk, struct mptcp_addr_info *skc);
+int mptcp_pm_nl_dump_addr(struct sk_buff *msg,
+ struct netlink_callback *cb);
+int mptcp_userspace_pm_dump_addr(struct sk_buff *msg,
+ struct netlink_callback *cb);
+int mptcp_pm_nl_get_addr(u8 id, struct mptcp_pm_addr_entry *addr,
+ struct genl_info *info);
+int mptcp_userspace_pm_get_addr(u8 id, struct mptcp_pm_addr_entry *addr,
+ struct genl_info *info);
-void mptcp_pm_nl_init(void);
-void mptcp_pm_nl_data_init(struct mptcp_sock *msk);
-void mptcp_pm_nl_fully_established(struct mptcp_sock *msk);
-void mptcp_pm_nl_subflow_established(struct mptcp_sock *msk);
-void mptcp_pm_nl_add_addr_received(struct mptcp_sock *msk);
-int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, struct sock_common *skc);
+static inline u8 subflow_get_local_id(const struct mptcp_subflow_context *subflow)
+{
+ int local_id = READ_ONCE(subflow->local_id);
+
+ if (local_id < 0)
+ return 0;
+ return local_id;
+}
-static inline struct mptcp_ext *mptcp_get_ext(struct sk_buff *skb)
+void __init mptcp_pm_kernel_register(void);
+void __init mptcp_pm_userspace_register(void);
+void __init mptcp_pm_nl_init(void);
+void mptcp_pm_worker(struct mptcp_sock *msk);
+void __mptcp_pm_kernel_worker(struct mptcp_sock *msk);
+u8 mptcp_pm_get_endp_signal_max(const struct mptcp_sock *msk);
+u8 mptcp_pm_get_endp_subflow_max(const struct mptcp_sock *msk);
+u8 mptcp_pm_get_endp_laminar_max(const struct mptcp_sock *msk);
+u8 mptcp_pm_get_endp_fullmesh_max(const struct mptcp_sock *msk);
+u8 mptcp_pm_get_limit_add_addr_accepted(const struct mptcp_sock *msk);
+u8 mptcp_pm_get_limit_extra_subflows(const struct mptcp_sock *msk);
+
+/* called under PM lock */
+static inline void __mptcp_pm_close_subflow(struct mptcp_sock *msk)
{
- return (struct mptcp_ext *)skb_ext_find(skb, SKB_EXT_MPTCP);
+ if (--msk->pm.extra_subflows < mptcp_pm_get_limit_extra_subflows(msk))
+ WRITE_ONCE(msk->pm.accept_subflow, true);
}
-static inline bool before64(__u64 seq1, __u64 seq2)
+static inline void mptcp_pm_close_subflow(struct mptcp_sock *msk)
{
- return (__s64)(seq1 - seq2) < 0;
+ spin_lock_bh(&msk->pm.lock);
+ __mptcp_pm_close_subflow(msk);
+ spin_unlock_bh(&msk->pm.lock);
}
-#define after64(seq2, seq1) before64(seq1, seq2)
+static inline bool mptcp_pm_add_addr_c_flag_case(struct mptcp_sock *msk)
+{
+ return READ_ONCE(msk->pm.remote_deny_join_id0) &&
+ msk->pm.local_addr_used == 0 &&
+ mptcp_pm_get_limit_add_addr_accepted(msk) == 0 &&
+ msk->pm.extra_subflows < mptcp_pm_get_limit_extra_subflows(msk);
+}
+
+void mptcp_sockopt_sync_locked(struct mptcp_sock *msk, struct sock *ssk);
+
+static inline struct mptcp_ext *mptcp_get_ext(const struct sk_buff *skb)
+{
+ return (struct mptcp_ext *)skb_ext_find(skb, SKB_EXT_MPTCP);
+}
void mptcp_diag_subflow_init(struct tcp_ulp_ops *ops);
+static inline bool __mptcp_check_fallback(const struct mptcp_sock *msk)
+{
+ return test_bit(MPTCP_FALLBACK_DONE, &msk->flags);
+}
+
+static inline bool mptcp_check_fallback(const struct sock *sk)
+{
+ struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
+ struct mptcp_sock *msk = mptcp_sk(subflow->conn);
+
+ return __mptcp_check_fallback(msk);
+}
+
+static inline bool __mptcp_has_initial_subflow(const struct mptcp_sock *msk)
+{
+ struct sock *ssk = READ_ONCE(msk->first);
+
+ return ssk && ((1 << inet_sk_state_load(ssk)) &
+ (TCPF_ESTABLISHED | TCPF_SYN_SENT |
+ TCPF_SYN_RECV | TCPF_LISTEN));
+}
+
+bool __mptcp_try_fallback(struct mptcp_sock *msk, int fb_mib);
+
+static inline bool mptcp_try_fallback(struct sock *ssk, int fb_mib)
+{
+ struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk);
+ struct sock *sk = subflow->conn;
+ struct mptcp_sock *msk;
+
+ msk = mptcp_sk(sk);
+ if (!__mptcp_try_fallback(msk, fb_mib))
+ return false;
+ if (READ_ONCE(msk->snd_data_fin_enable) && !(ssk->sk_shutdown & SEND_SHUTDOWN)) {
+ gfp_t saved_allocation = ssk->sk_allocation;
+
+ /* we are in a atomic (BH) scope, override ssk default for data
+ * fin allocation
+ */
+ ssk->sk_allocation = GFP_ATOMIC;
+ ssk->sk_shutdown |= SEND_SHUTDOWN;
+ tcp_shutdown(ssk, SEND_SHUTDOWN);
+ ssk->sk_allocation = saved_allocation;
+ }
+ return true;
+}
+
+static inline void mptcp_early_fallback(struct mptcp_sock *msk,
+ struct mptcp_subflow_context *subflow,
+ int fb_mib)
+{
+ subflow->request_mptcp = 0;
+ WARN_ON_ONCE(!__mptcp_try_fallback(msk, fb_mib));
+}
+
+static inline bool mptcp_check_infinite_map(struct sk_buff *skb)
+{
+ struct mptcp_ext *mpext;
+
+ mpext = skb ? mptcp_get_ext(skb) : NULL;
+ if (mpext && mpext->infinite_map)
+ return true;
+
+ return false;
+}
+
+static inline bool is_active_ssk(struct mptcp_subflow_context *subflow)
+{
+ return (subflow->request_mptcp || subflow->request_join);
+}
+
+static inline bool subflow_simultaneous_connect(struct sock *sk)
+{
+ struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
+
+ return (1 << sk->sk_state) &
+ (TCPF_ESTABLISHED | TCPF_FIN_WAIT1 | TCPF_FIN_WAIT2 | TCPF_CLOSING) &&
+ is_active_ssk(subflow) &&
+ !subflow->conn_finished;
+}
+
+#ifdef CONFIG_SYN_COOKIES
+void subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req,
+ struct sk_buff *skb);
+bool mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req,
+ struct sk_buff *skb);
+void __init mptcp_join_cookie_init(void);
+#else
+static inline void
+subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req,
+ struct sk_buff *skb) {}
+static inline bool
+mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req,
+ struct sk_buff *skb)
+{
+ return false;
+}
+
+static inline void mptcp_join_cookie_init(void) {}
+#endif
+
#endif /* __MPTCP_PROTOCOL_H */
generated by cgit (git 2.34.1) at 2025-12-25 13:59:33 +0000