1 /* SPDX-License-Identifier: GPL-2.0 */
4 * Copyright (c) 2017 - 2019, Intel Corporation.
7 #ifndef __MPTCP_PROTOCOL_H
8 #define __MPTCP_PROTOCOL_H
10 #include <linux/random.h>
12 #include <net/inet_connection_sock.h>
13 #include <uapi/linux/mptcp.h>
14 #include <net/genetlink.h>
16 #define MPTCP_SUPPORTED_VERSION 1
18 /* MPTCP option bits */
19 #define OPTION_MPTCP_MPC_SYN BIT(0)
20 #define OPTION_MPTCP_MPC_SYNACK BIT(1)
21 #define OPTION_MPTCP_MPC_ACK BIT(2)
22 #define OPTION_MPTCP_MPJ_SYN BIT(3)
23 #define OPTION_MPTCP_MPJ_SYNACK BIT(4)
24 #define OPTION_MPTCP_MPJ_ACK BIT(5)
25 #define OPTION_MPTCP_ADD_ADDR BIT(6)
26 #define OPTION_MPTCP_RM_ADDR BIT(7)
27 #define OPTION_MPTCP_FASTCLOSE BIT(8)
28 #define OPTION_MPTCP_PRIO BIT(9)
29 #define OPTION_MPTCP_RST BIT(10)
30 #define OPTION_MPTCP_DSS BIT(11)
31 #define OPTION_MPTCP_FAIL BIT(12)
33 #define OPTION_MPTCP_CSUMREQD BIT(13)
35 #define OPTIONS_MPTCP_MPC (OPTION_MPTCP_MPC_SYN | OPTION_MPTCP_MPC_SYNACK | \
37 #define OPTIONS_MPTCP_MPJ (OPTION_MPTCP_MPJ_SYN | OPTION_MPTCP_MPJ_SYNACK | \
40 /* MPTCP option subtypes */
41 #define MPTCPOPT_MP_CAPABLE 0
42 #define MPTCPOPT_MP_JOIN 1
43 #define MPTCPOPT_DSS 2
44 #define MPTCPOPT_ADD_ADDR 3
45 #define MPTCPOPT_RM_ADDR 4
46 #define MPTCPOPT_MP_PRIO 5
47 #define MPTCPOPT_MP_FAIL 6
48 #define MPTCPOPT_MP_FASTCLOSE 7
49 #define MPTCPOPT_RST 8
51 /* MPTCP suboption lengths */
52 #define TCPOLEN_MPTCP_MPC_SYN 4
53 #define TCPOLEN_MPTCP_MPC_SYNACK 12
54 #define TCPOLEN_MPTCP_MPC_ACK 20
55 #define TCPOLEN_MPTCP_MPC_ACK_DATA 22
56 #define TCPOLEN_MPTCP_MPJ_SYN 12
57 #define TCPOLEN_MPTCP_MPJ_SYNACK 16
58 #define TCPOLEN_MPTCP_MPJ_ACK 24
59 #define TCPOLEN_MPTCP_DSS_BASE 4
60 #define TCPOLEN_MPTCP_DSS_ACK32 4
61 #define TCPOLEN_MPTCP_DSS_ACK64 8
62 #define TCPOLEN_MPTCP_DSS_MAP32 10
63 #define TCPOLEN_MPTCP_DSS_MAP64 14
64 #define TCPOLEN_MPTCP_DSS_CHECKSUM 2
65 #define TCPOLEN_MPTCP_ADD_ADDR 16
66 #define TCPOLEN_MPTCP_ADD_ADDR_PORT 18
67 #define TCPOLEN_MPTCP_ADD_ADDR_BASE 8
68 #define TCPOLEN_MPTCP_ADD_ADDR_BASE_PORT 10
69 #define TCPOLEN_MPTCP_ADD_ADDR6 28
70 #define TCPOLEN_MPTCP_ADD_ADDR6_PORT 30
71 #define TCPOLEN_MPTCP_ADD_ADDR6_BASE 20
72 #define TCPOLEN_MPTCP_ADD_ADDR6_BASE_PORT 22
73 #define TCPOLEN_MPTCP_PORT_LEN 2
74 #define TCPOLEN_MPTCP_PORT_ALIGN 2
75 #define TCPOLEN_MPTCP_RM_ADDR_BASE 3
76 #define TCPOLEN_MPTCP_PRIO 3
77 #define TCPOLEN_MPTCP_PRIO_ALIGN 4
78 #define TCPOLEN_MPTCP_FASTCLOSE 12
79 #define TCPOLEN_MPTCP_RST 4
80 #define TCPOLEN_MPTCP_FAIL 12
82 #define TCPOLEN_MPTCP_MPC_ACK_DATA_CSUM (TCPOLEN_MPTCP_DSS_CHECKSUM + TCPOLEN_MPTCP_MPC_ACK_DATA)
84 /* MPTCP MP_JOIN flags */
85 #define MPTCPOPT_BACKUP BIT(0)
86 #define MPTCPOPT_THMAC_LEN 8
88 /* MPTCP MP_CAPABLE flags */
89 #define MPTCP_VERSION_MASK (0x0F)
90 #define MPTCP_CAP_CHECKSUM_REQD BIT(7)
91 #define MPTCP_CAP_EXTENSIBILITY BIT(6)
92 #define MPTCP_CAP_DENY_JOIN_ID0 BIT(5)
93 #define MPTCP_CAP_HMAC_SHA256 BIT(0)
94 #define MPTCP_CAP_FLAG_MASK (0x1F)
97 #define MPTCP_DSS_DATA_FIN BIT(4)
98 #define MPTCP_DSS_DSN64 BIT(3)
99 #define MPTCP_DSS_HAS_MAP BIT(2)
100 #define MPTCP_DSS_ACK64 BIT(1)
101 #define MPTCP_DSS_HAS_ACK BIT(0)
102 #define MPTCP_DSS_FLAG_MASK (0x1F)
104 /* MPTCP ADD_ADDR flags */
105 #define MPTCP_ADDR_ECHO BIT(0)
107 /* MPTCP MP_PRIO flags */
108 #define MPTCP_PRIO_BKUP BIT(0)
110 /* MPTCP TCPRST flags */
111 #define MPTCP_RST_TRANSIENT BIT(0)
113 /* MPTCP socket atomic flags */
114 #define MPTCP_NOSPACE 1
115 #define MPTCP_WORK_RTX 2
116 #define MPTCP_WORK_EOF 3
117 #define MPTCP_FALLBACK_DONE 4
118 #define MPTCP_WORK_CLOSE_SUBFLOW 5
120 /* MPTCP socket release cb flags */
121 #define MPTCP_PUSH_PENDING 1
122 #define MPTCP_CLEAN_UNA 2
123 #define MPTCP_ERROR_REPORT 3
124 #define MPTCP_RETRANSMIT 4
125 #define MPTCP_FLUSH_JOIN_LIST 5
126 #define MPTCP_CONNECTED 6
127 #define MPTCP_RESET_SCHEDULER 7
129 static inline bool before64(__u64 seq1, __u64 seq2)
131 return (__s64)(seq1 - seq2) < 0;
134 #define after64(seq2, seq1) before64(seq1, seq2)
136 struct mptcp_options_received {
161 u8 hmac[MPTCPOPT_HMAC_LEN];
162 struct mptcp_addr_info addr;
163 struct mptcp_rm_list rm_list;
168 static inline __be32 mptcp_option(u8 subopt, u8 len, u8 nib, u8 field)
170 return htonl((TCPOPT_MPTCP << 24) | (len << 16) | (subopt << 12) |
171 ((nib & 0xF) << 8) | field);
174 enum mptcp_pm_status {
175 MPTCP_PM_ADD_ADDR_RECEIVED,
176 MPTCP_PM_ADD_ADDR_SEND_ACK,
177 MPTCP_PM_RM_ADDR_RECEIVED,
178 MPTCP_PM_ESTABLISHED,
179 MPTCP_PM_SUBFLOW_ESTABLISHED,
180 MPTCP_PM_ALREADY_ESTABLISHED, /* persistent status, set after ESTABLISHED event */
181 MPTCP_PM_MPC_ENDPOINT_ACCOUNTED /* persistent status, set after MPC local address is
182 * accounted int id_avail_bitmap
187 MPTCP_PM_TYPE_KERNEL = 0,
188 MPTCP_PM_TYPE_USERSPACE,
191 __MPTCP_PM_TYPE_MAX = __MPTCP_PM_TYPE_NR - 1,
194 /* Status bits below MPTCP_PM_ALREADY_ESTABLISHED need pm worker actions */
195 #define MPTCP_PM_WORK_MASK ((1 << MPTCP_PM_ALREADY_ESTABLISHED) - 1)
197 enum mptcp_addr_signal_status {
198 MPTCP_ADD_ADDR_SIGNAL,
200 MPTCP_RM_ADDR_SIGNAL,
203 /* max value of mptcp_addr_info.id */
204 #define MPTCP_PM_MAX_ADDR_ID U8_MAX
206 struct mptcp_pm_data {
207 struct mptcp_addr_info local;
208 struct mptcp_addr_info remote;
209 struct list_head anno_list;
210 struct list_head userspace_pm_local_addr_list;
212 spinlock_t lock; /*protects the whole PM data */
219 bool remote_deny_join_id0;
220 u8 add_addr_signaled;
221 u8 add_addr_accepted;
226 DECLARE_BITMAP(id_avail_bitmap, MPTCP_PM_MAX_ADDR_ID + 1);
227 struct mptcp_rm_list rm_list_tx;
228 struct mptcp_rm_list rm_list_rx;
231 struct mptcp_pm_addr_entry {
232 struct list_head list;
233 struct mptcp_addr_info addr;
239 struct mptcp_data_frag {
240 struct list_head list;
249 /* MPTCP connection sock */
251 /* inet_connection_sock must be the first member */
252 struct inet_connection_sock sk;
258 atomic64_t rcv_wnd_sent;
259 u64 rcv_data_fin_seq;
261 struct sock *last_snd;
264 u64 recovery_snd_nxt; /* in recovery mode accept up to this seq;
265 * recovery related fields are under data_lock
270 unsigned long timer_ival;
274 unsigned long cb_flags;
275 unsigned long push_pending;
276 bool recovery; /* closing subflow write queue reinjected */
278 bool fully_established;
280 bool snd_data_fin_enable;
282 bool use_64bit_ack; /* Set when we received a 64-bit DSN */
284 bool allow_infinite_fallback;
289 struct work_struct work;
290 struct sk_buff *ooo_last_skb;
291 struct rb_root out_of_order_queue;
292 struct sk_buff_head receive_queue;
293 struct list_head conn_list;
294 struct list_head rtx_queue;
295 struct mptcp_data_frag *first_pending;
296 struct list_head join_list;
297 struct socket *subflow; /* outgoing connect/listener/!mp_capable */
299 struct mptcp_pm_data pm;
301 u32 space; /* bytes copied in last measurement window */
302 u32 copied; /* bytes copied in this measurement window */
303 u64 time; /* start time of measurement window */
304 u64 rtt_us; /* last maximum rtt of subflows */
308 char ca_name[TCP_CA_NAME_MAX];
309 struct mptcp_sock *dl_next;
312 #define mptcp_data_lock(sk) spin_lock_bh(&(sk)->sk_lock.slock)
313 #define mptcp_data_unlock(sk) spin_unlock_bh(&(sk)->sk_lock.slock)
315 #define mptcp_for_each_subflow(__msk, __subflow) \
316 list_for_each_entry(__subflow, &((__msk)->conn_list), node)
317 #define mptcp_for_each_subflow_safe(__msk, __subflow, __tmp) \
318 list_for_each_entry_safe(__subflow, __tmp, &((__msk)->conn_list), node)
320 static inline void msk_owned_by_me(const struct mptcp_sock *msk)
322 sock_owned_by_me((const struct sock *)msk);
325 static inline struct mptcp_sock *mptcp_sk(const struct sock *sk)
327 return (struct mptcp_sock *)sk;
330 /* the msk socket don't use the backlog, also account for the bulk
333 static inline int __mptcp_rmem(const struct sock *sk)
335 return atomic_read(&sk->sk_rmem_alloc) - READ_ONCE(mptcp_sk(sk)->rmem_released);
338 static inline int __mptcp_space(const struct sock *sk)
340 return tcp_win_from_space(sk, READ_ONCE(sk->sk_rcvbuf) - __mptcp_rmem(sk));
343 static inline struct mptcp_data_frag *mptcp_send_head(const struct sock *sk)
345 const struct mptcp_sock *msk = mptcp_sk(sk);
347 return READ_ONCE(msk->first_pending);
350 static inline struct mptcp_data_frag *mptcp_send_next(struct sock *sk)
352 struct mptcp_sock *msk = mptcp_sk(sk);
353 struct mptcp_data_frag *cur;
355 cur = msk->first_pending;
356 return list_is_last(&cur->list, &msk->rtx_queue) ? NULL :
357 list_next_entry(cur, list);
360 static inline struct mptcp_data_frag *mptcp_pending_tail(const struct sock *sk)
362 struct mptcp_sock *msk = mptcp_sk(sk);
364 if (!msk->first_pending)
367 if (WARN_ON_ONCE(list_empty(&msk->rtx_queue)))
370 return list_last_entry(&msk->rtx_queue, struct mptcp_data_frag, list);
373 static inline struct mptcp_data_frag *mptcp_rtx_head(const struct sock *sk)
375 struct mptcp_sock *msk = mptcp_sk(sk);
377 if (msk->snd_una == READ_ONCE(msk->snd_nxt))
380 return list_first_entry_or_null(&msk->rtx_queue, struct mptcp_data_frag, list);
383 struct csum_pseudo_header {
390 struct mptcp_subflow_request_sock {
391 struct tcp_request_sock sk;
406 struct mptcp_sock *msk;
407 struct hlist_nulls_node token_node;
410 static inline struct mptcp_subflow_request_sock *
411 mptcp_subflow_rsk(const struct request_sock *rsk)
413 return (struct mptcp_subflow_request_sock *)rsk;
416 enum mptcp_data_avail {
417 MPTCP_SUBFLOW_NODATA,
418 MPTCP_SUBFLOW_DATA_AVAIL,
421 struct mptcp_delegated_action {
422 struct napi_struct napi;
423 struct list_head head;
426 DECLARE_PER_CPU(struct mptcp_delegated_action, mptcp_delegated_actions);
428 #define MPTCP_DELEGATE_SEND 0
429 #define MPTCP_DELEGATE_ACK 1
431 /* MPTCP subflow context */
432 struct mptcp_subflow_context {
433 struct list_head node;/* conn_list of subflows */
437 unsigned long avg_pacing_rate; /* protected by msk socket lock */
448 __wsum map_data_csum;
450 u32 request_mptcp : 1, /* send MP_CAPABLE */
451 request_join : 1, /* send MP_JOIN */
453 mp_capable : 1, /* remote is MPTCP capable */
454 mp_join : 1, /* remote is JOINing */
455 fully_established : 1, /* path validated */
456 pm_notified : 1, /* PM hook called for established status */
466 send_infinite_map : 1,
468 can_ack : 1, /* only after processing the remote a key */
469 disposable : 1, /* ctx can be free at ulp release time */
470 stale : 1, /* unable to snd/rcv data, do not use for xmit */
471 local_id_valid : 1, /* local_id is correctly initialized */
472 valid_csum_seen : 1; /* at least one csum validated */
473 enum mptcp_data_avail data_avail;
478 u8 hmac[MPTCPOPT_HMAC_LEN];
482 u8 reset_transient:1;
486 long delegated_status;
487 unsigned long fail_tout;
491 struct list_head delegated_node; /* link into delegated_action, protected by local BH */
494 u32 stale_rcv_tstamp;
496 struct sock *tcp_sock; /* tcp sk backpointer */
497 struct sock *conn; /* parent mptcp_sock */
498 const struct inet_connection_sock_af_ops *icsk_af_ops;
499 void (*tcp_state_change)(struct sock *sk);
500 void (*tcp_error_report)(struct sock *sk);
505 static inline struct mptcp_subflow_context *
506 mptcp_subflow_ctx(const struct sock *sk)
508 struct inet_connection_sock *icsk = inet_csk(sk);
510 /* Use RCU on icsk_ulp_data only for sock diag code */
511 return (__force struct mptcp_subflow_context *)icsk->icsk_ulp_data;
514 static inline struct sock *
515 mptcp_subflow_tcp_sock(const struct mptcp_subflow_context *subflow)
517 return subflow->tcp_sock;
521 mptcp_subflow_ctx_reset(struct mptcp_subflow_context *subflow)
523 memset(&subflow->reset, 0, sizeof(subflow->reset));
524 subflow->request_mptcp = 1;
528 mptcp_subflow_get_map_offset(const struct mptcp_subflow_context *subflow)
530 return tcp_sk(mptcp_subflow_tcp_sock(subflow))->copied_seq -
531 subflow->ssn_offset -
532 subflow->map_subflow_seq;
536 mptcp_subflow_get_mapped_dsn(const struct mptcp_subflow_context *subflow)
538 return subflow->map_seq + mptcp_subflow_get_map_offset(subflow);
541 void mptcp_subflow_process_delegated(struct sock *ssk);
543 static inline void mptcp_subflow_delegate(struct mptcp_subflow_context *subflow, int action)
545 struct mptcp_delegated_action *delegated;
548 /* the caller held the subflow bh socket lock */
549 lockdep_assert_in_softirq();
551 /* The implied barrier pairs with mptcp_subflow_delegated_done(), and
552 * ensures the below list check sees list updates done prior to status
555 if (!test_and_set_bit(action, &subflow->delegated_status)) {
556 /* still on delegated list from previous scheduling */
557 if (!list_empty(&subflow->delegated_node))
560 delegated = this_cpu_ptr(&mptcp_delegated_actions);
561 schedule = list_empty(&delegated->head);
562 list_add_tail(&subflow->delegated_node, &delegated->head);
563 sock_hold(mptcp_subflow_tcp_sock(subflow));
565 napi_schedule(&delegated->napi);
569 static inline struct mptcp_subflow_context *
570 mptcp_subflow_delegated_next(struct mptcp_delegated_action *delegated)
572 struct mptcp_subflow_context *ret;
574 if (list_empty(&delegated->head))
577 ret = list_first_entry(&delegated->head, struct mptcp_subflow_context, delegated_node);
578 list_del_init(&ret->delegated_node);
582 static inline bool mptcp_subflow_has_delegated_action(const struct mptcp_subflow_context *subflow)
584 return !!READ_ONCE(subflow->delegated_status);
587 static inline void mptcp_subflow_delegated_done(struct mptcp_subflow_context *subflow, int action)
589 /* pairs with mptcp_subflow_delegate, ensures delegate_node is updated before
590 * touching the status bit
593 clear_bit(action, &subflow->delegated_status);
596 int mptcp_is_enabled(const struct net *net);
597 unsigned int mptcp_get_add_addr_timeout(const struct net *net);
598 int mptcp_is_checksum_enabled(const struct net *net);
599 int mptcp_allow_join_id0(const struct net *net);
600 unsigned int mptcp_stale_loss_cnt(const struct net *net);
601 int mptcp_get_pm_type(const struct net *net);
602 void mptcp_subflow_fully_established(struct mptcp_subflow_context *subflow,
603 struct mptcp_options_received *mp_opt);
604 bool __mptcp_retransmit_pending_data(struct sock *sk);
605 void mptcp_check_and_set_pending(struct sock *sk);
606 void __mptcp_push_pending(struct sock *sk, unsigned int flags);
607 bool mptcp_subflow_data_available(struct sock *sk);
608 void __init mptcp_subflow_init(void);
609 void mptcp_subflow_shutdown(struct sock *sk, struct sock *ssk, int how);
610 void mptcp_close_ssk(struct sock *sk, struct sock *ssk,
611 struct mptcp_subflow_context *subflow);
612 void __mptcp_subflow_send_ack(struct sock *ssk);
613 void mptcp_subflow_reset(struct sock *ssk);
614 void mptcp_subflow_queue_clean(struct sock *ssk);
615 void mptcp_sock_graft(struct sock *sk, struct socket *parent);
616 struct socket *__mptcp_nmpc_socket(const struct mptcp_sock *msk);
617 bool __mptcp_close(struct sock *sk, long timeout);
618 void mptcp_cancel_work(struct sock *sk);
620 bool mptcp_addresses_equal(const struct mptcp_addr_info *a,
621 const struct mptcp_addr_info *b, bool use_port);
623 /* called with sk socket lock held */
624 int __mptcp_subflow_connect(struct sock *sk, const struct mptcp_addr_info *loc,
625 const struct mptcp_addr_info *remote);
626 int mptcp_subflow_create_socket(struct sock *sk, struct socket **new_sock);
627 void mptcp_info2sockaddr(const struct mptcp_addr_info *info,
628 struct sockaddr_storage *addr,
629 unsigned short family);
631 static inline bool __tcp_can_send(const struct sock *ssk)
633 /* only send if our side has not closed yet */
634 return ((1 << inet_sk_state_load(ssk)) & (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT));
637 static inline bool __mptcp_subflow_active(struct mptcp_subflow_context *subflow)
639 /* can't send if JOIN hasn't completed yet (i.e. is usable for mptcp) */
640 if (subflow->request_join && !subflow->fully_established)
643 return __tcp_can_send(mptcp_subflow_tcp_sock(subflow));
646 void mptcp_subflow_set_active(struct mptcp_subflow_context *subflow);
648 bool mptcp_subflow_active(struct mptcp_subflow_context *subflow);
650 static inline void mptcp_subflow_tcp_fallback(struct sock *sk,
651 struct mptcp_subflow_context *ctx)
653 sk->sk_data_ready = sock_def_readable;
654 sk->sk_state_change = ctx->tcp_state_change;
655 sk->sk_write_space = sk_stream_write_space;
656 sk->sk_error_report = ctx->tcp_error_report;
658 inet_csk(sk)->icsk_af_ops = ctx->icsk_af_ops;
661 void __init mptcp_proto_init(void);
662 #if IS_ENABLED(CONFIG_MPTCP_IPV6)
663 int __init mptcp_proto_v6_init(void);
666 struct sock *mptcp_sk_clone(const struct sock *sk,
667 const struct mptcp_options_received *mp_opt,
668 struct request_sock *req);
669 void mptcp_get_options(const struct sk_buff *skb,
670 struct mptcp_options_received *mp_opt);
672 void mptcp_finish_connect(struct sock *sk);
673 void __mptcp_set_connected(struct sock *sk);
674 void mptcp_reset_timeout(struct mptcp_sock *msk, unsigned long fail_tout);
675 static inline bool mptcp_is_fully_established(struct sock *sk)
677 return inet_sk_state_load(sk) == TCP_ESTABLISHED &&
678 READ_ONCE(mptcp_sk(sk)->fully_established);
680 void mptcp_rcv_space_init(struct mptcp_sock *msk, const struct sock *ssk);
681 void mptcp_data_ready(struct sock *sk, struct sock *ssk);
682 bool mptcp_finish_join(struct sock *sk);
683 bool mptcp_schedule_work(struct sock *sk);
684 int mptcp_setsockopt(struct sock *sk, int level, int optname,
685 sockptr_t optval, unsigned int optlen);
686 int mptcp_getsockopt(struct sock *sk, int level, int optname,
687 char __user *optval, int __user *option);
689 u64 __mptcp_expand_seq(u64 old_seq, u64 cur_seq);
690 static inline u64 mptcp_expand_seq(u64 old_seq, u64 cur_seq, bool use_64bit)
695 return __mptcp_expand_seq(old_seq, cur_seq);
697 void __mptcp_check_push(struct sock *sk, struct sock *ssk);
698 void __mptcp_data_acked(struct sock *sk);
699 void __mptcp_error_report(struct sock *sk);
700 void mptcp_subflow_eof(struct sock *sk);
701 bool mptcp_update_rcv_data_fin(struct mptcp_sock *msk, u64 data_fin_seq, bool use_64bit);
702 static inline bool mptcp_data_fin_enabled(const struct mptcp_sock *msk)
704 return READ_ONCE(msk->snd_data_fin_enable) &&
705 READ_ONCE(msk->write_seq) == READ_ONCE(msk->snd_nxt);
708 static inline bool mptcp_propagate_sndbuf(struct sock *sk, struct sock *ssk)
710 if ((sk->sk_userlocks & SOCK_SNDBUF_LOCK) || ssk->sk_sndbuf <= READ_ONCE(sk->sk_sndbuf))
713 WRITE_ONCE(sk->sk_sndbuf, ssk->sk_sndbuf);
717 static inline void mptcp_write_space(struct sock *sk)
719 if (sk_stream_is_writeable(sk)) {
720 /* pairs with memory barrier in mptcp_poll */
722 if (test_and_clear_bit(MPTCP_NOSPACE, &mptcp_sk(sk)->flags))
723 sk_stream_write_space(sk);
727 void mptcp_destroy_common(struct mptcp_sock *msk, unsigned int flags);
729 #define MPTCP_TOKEN_MAX_RETRIES 4
731 void __init mptcp_token_init(void);
732 static inline void mptcp_token_init_request(struct request_sock *req)
734 mptcp_subflow_rsk(req)->token_node.pprev = NULL;
737 int mptcp_token_new_request(struct request_sock *req);
738 void mptcp_token_destroy_request(struct request_sock *req);
739 int mptcp_token_new_connect(struct sock *sk);
740 void mptcp_token_accept(struct mptcp_subflow_request_sock *r,
741 struct mptcp_sock *msk);
742 bool mptcp_token_exists(u32 token);
743 struct mptcp_sock *mptcp_token_get_sock(struct net *net, u32 token);
744 struct mptcp_sock *mptcp_token_iter_next(const struct net *net, long *s_slot,
746 void mptcp_token_destroy(struct mptcp_sock *msk);
748 void mptcp_crypto_key_sha(u64 key, u32 *token, u64 *idsn);
750 void mptcp_crypto_hmac_sha(u64 key1, u64 key2, u8 *msg, int len, void *hmac);
751 __sum16 __mptcp_make_csum(u64 data_seq, u32 subflow_seq, u16 data_len, __wsum sum);
753 void __init mptcp_pm_init(void);
754 void mptcp_pm_data_init(struct mptcp_sock *msk);
755 void mptcp_pm_data_reset(struct mptcp_sock *msk);
756 int mptcp_pm_parse_addr(struct nlattr *attr, struct genl_info *info,
757 struct mptcp_addr_info *addr);
758 int mptcp_pm_parse_entry(struct nlattr *attr, struct genl_info *info,
760 struct mptcp_pm_addr_entry *entry);
761 void mptcp_pm_subflow_chk_stale(const struct mptcp_sock *msk, struct sock *ssk);
762 void mptcp_pm_nl_subflow_chk_stale(const struct mptcp_sock *msk, struct sock *ssk);
763 void mptcp_pm_new_connection(struct mptcp_sock *msk, const struct sock *ssk, int server_side);
764 void mptcp_pm_fully_established(struct mptcp_sock *msk, const struct sock *ssk, gfp_t gfp);
765 bool mptcp_pm_allow_new_subflow(struct mptcp_sock *msk);
766 void mptcp_pm_connection_closed(struct mptcp_sock *msk);
767 void mptcp_pm_subflow_established(struct mptcp_sock *msk);
768 bool mptcp_pm_nl_check_work_pending(struct mptcp_sock *msk);
769 void mptcp_pm_subflow_check_next(struct mptcp_sock *msk, const struct sock *ssk,
770 const struct mptcp_subflow_context *subflow);
771 void mptcp_pm_add_addr_received(const struct sock *ssk,
772 const struct mptcp_addr_info *addr);
773 void mptcp_pm_add_addr_echoed(struct mptcp_sock *msk,
774 const struct mptcp_addr_info *addr);
775 void mptcp_pm_add_addr_send_ack(struct mptcp_sock *msk);
776 void mptcp_pm_nl_addr_send_ack(struct mptcp_sock *msk);
777 void mptcp_pm_rm_addr_received(struct mptcp_sock *msk,
778 const struct mptcp_rm_list *rm_list);
779 void mptcp_pm_mp_prio_received(struct sock *sk, u8 bkup);
780 void mptcp_pm_mp_fail_received(struct sock *sk, u64 fail_seq);
781 int mptcp_pm_nl_mp_prio_send_ack(struct mptcp_sock *msk,
782 struct mptcp_addr_info *addr,
783 struct mptcp_addr_info *rem,
785 bool mptcp_pm_alloc_anno_list(struct mptcp_sock *msk,
786 const struct mptcp_pm_addr_entry *entry);
787 void mptcp_pm_free_anno_list(struct mptcp_sock *msk);
788 bool mptcp_pm_sport_in_anno_list(struct mptcp_sock *msk, const struct sock *sk);
789 struct mptcp_pm_add_entry *
790 mptcp_pm_del_add_timer(struct mptcp_sock *msk,
791 const struct mptcp_addr_info *addr, bool check_id);
792 struct mptcp_pm_add_entry *
793 mptcp_lookup_anno_list_by_saddr(const struct mptcp_sock *msk,
794 const struct mptcp_addr_info *addr);
795 int mptcp_pm_get_flags_and_ifindex_by_id(struct mptcp_sock *msk,
797 u8 *flags, int *ifindex);
798 int mptcp_userspace_pm_get_flags_and_ifindex_by_id(struct mptcp_sock *msk,
800 u8 *flags, int *ifindex);
801 int mptcp_userspace_pm_set_flags(struct net *net, struct nlattr *token,
802 struct mptcp_pm_addr_entry *loc,
803 struct mptcp_pm_addr_entry *rem, u8 bkup);
804 int mptcp_pm_announce_addr(struct mptcp_sock *msk,
805 const struct mptcp_addr_info *addr,
807 int mptcp_pm_remove_addr(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list);
808 int mptcp_pm_remove_subflow(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list);
809 void mptcp_pm_remove_addrs_and_subflows(struct mptcp_sock *msk,
810 struct list_head *rm_list);
812 int mptcp_userspace_pm_append_new_local_addr(struct mptcp_sock *msk,
813 struct mptcp_pm_addr_entry *entry);
814 void mptcp_free_local_addr_list(struct mptcp_sock *msk);
815 int mptcp_nl_cmd_announce(struct sk_buff *skb, struct genl_info *info);
816 int mptcp_nl_cmd_remove(struct sk_buff *skb, struct genl_info *info);
817 int mptcp_nl_cmd_sf_create(struct sk_buff *skb, struct genl_info *info);
818 int mptcp_nl_cmd_sf_destroy(struct sk_buff *skb, struct genl_info *info);
820 void mptcp_event(enum mptcp_event_type type, const struct mptcp_sock *msk,
821 const struct sock *ssk, gfp_t gfp);
822 void mptcp_event_addr_announced(const struct sock *ssk, const struct mptcp_addr_info *info);
823 void mptcp_event_addr_removed(const struct mptcp_sock *msk, u8 id);
824 bool mptcp_userspace_pm_active(const struct mptcp_sock *msk);
826 static inline bool mptcp_pm_should_add_signal(struct mptcp_sock *msk)
828 return READ_ONCE(msk->pm.addr_signal) &
829 (BIT(MPTCP_ADD_ADDR_SIGNAL) | BIT(MPTCP_ADD_ADDR_ECHO));
832 static inline bool mptcp_pm_should_add_signal_addr(struct mptcp_sock *msk)
834 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_SIGNAL);
837 static inline bool mptcp_pm_should_add_signal_echo(struct mptcp_sock *msk)
839 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_ECHO);
842 static inline bool mptcp_pm_should_rm_signal(struct mptcp_sock *msk)
844 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_RM_ADDR_SIGNAL);
847 static inline bool mptcp_pm_is_userspace(const struct mptcp_sock *msk)
849 return READ_ONCE(msk->pm.pm_type) == MPTCP_PM_TYPE_USERSPACE;
852 static inline bool mptcp_pm_is_kernel(const struct mptcp_sock *msk)
854 return READ_ONCE(msk->pm.pm_type) == MPTCP_PM_TYPE_KERNEL;
857 static inline unsigned int mptcp_add_addr_len(int family, bool echo, bool port)
859 u8 len = TCPOLEN_MPTCP_ADD_ADDR_BASE;
861 if (family == AF_INET6)
862 len = TCPOLEN_MPTCP_ADD_ADDR6_BASE;
864 len += MPTCPOPT_THMAC_LEN;
865 /* account for 2 trailing 'nop' options */
867 len += TCPOLEN_MPTCP_PORT_LEN + TCPOLEN_MPTCP_PORT_ALIGN;
872 static inline int mptcp_rm_addr_len(const struct mptcp_rm_list *rm_list)
874 if (rm_list->nr == 0 || rm_list->nr > MPTCP_RM_IDS_MAX)
877 return TCPOLEN_MPTCP_RM_ADDR_BASE + roundup(rm_list->nr - 1, 4) + 1;
880 bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, const struct sk_buff *skb,
881 unsigned int opt_size, unsigned int remaining,
882 struct mptcp_addr_info *addr, bool *echo,
883 bool *drop_other_suboptions);
884 bool mptcp_pm_rm_addr_signal(struct mptcp_sock *msk, unsigned int remaining,
885 struct mptcp_rm_list *rm_list);
886 int mptcp_pm_get_local_id(struct mptcp_sock *msk, struct sock_common *skc);
887 int mptcp_userspace_pm_get_local_id(struct mptcp_sock *msk, struct mptcp_addr_info *skc);
889 void __init mptcp_pm_nl_init(void);
890 void mptcp_pm_nl_work(struct mptcp_sock *msk);
891 void mptcp_pm_nl_rm_subflow_received(struct mptcp_sock *msk,
892 const struct mptcp_rm_list *rm_list);
893 int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, struct sock_common *skc);
894 unsigned int mptcp_pm_get_add_addr_signal_max(const struct mptcp_sock *msk);
895 unsigned int mptcp_pm_get_add_addr_accept_max(const struct mptcp_sock *msk);
896 unsigned int mptcp_pm_get_subflows_max(const struct mptcp_sock *msk);
897 unsigned int mptcp_pm_get_local_addr_max(const struct mptcp_sock *msk);
899 /* called under PM lock */
900 static inline void __mptcp_pm_close_subflow(struct mptcp_sock *msk)
902 if (--msk->pm.subflows < mptcp_pm_get_subflows_max(msk))
903 WRITE_ONCE(msk->pm.accept_subflow, true);
906 static inline void mptcp_pm_close_subflow(struct mptcp_sock *msk)
908 spin_lock_bh(&msk->pm.lock);
909 __mptcp_pm_close_subflow(msk);
910 spin_unlock_bh(&msk->pm.lock);
913 void mptcp_sockopt_sync(struct mptcp_sock *msk, struct sock *ssk);
914 void mptcp_sockopt_sync_locked(struct mptcp_sock *msk, struct sock *ssk);
916 static inline struct mptcp_ext *mptcp_get_ext(const struct sk_buff *skb)
918 return (struct mptcp_ext *)skb_ext_find(skb, SKB_EXT_MPTCP);
921 void mptcp_diag_subflow_init(struct tcp_ulp_ops *ops);
923 static inline bool __mptcp_check_fallback(const struct mptcp_sock *msk)
925 return test_bit(MPTCP_FALLBACK_DONE, &msk->flags);
928 static inline bool mptcp_check_fallback(const struct sock *sk)
930 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
931 struct mptcp_sock *msk = mptcp_sk(subflow->conn);
933 return __mptcp_check_fallback(msk);
936 static inline void __mptcp_do_fallback(struct mptcp_sock *msk)
938 if (test_bit(MPTCP_FALLBACK_DONE, &msk->flags)) {
939 pr_debug("TCP fallback already done (msk=%p)", msk);
942 set_bit(MPTCP_FALLBACK_DONE, &msk->flags);
945 static inline void mptcp_do_fallback(struct sock *ssk)
947 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk);
948 struct sock *sk = subflow->conn;
949 struct mptcp_sock *msk;
952 __mptcp_do_fallback(msk);
953 if (READ_ONCE(msk->snd_data_fin_enable) && !(ssk->sk_shutdown & SEND_SHUTDOWN)) {
954 gfp_t saved_allocation = ssk->sk_allocation;
956 /* we are in a atomic (BH) scope, override ssk default for data
959 ssk->sk_allocation = GFP_ATOMIC;
960 ssk->sk_shutdown |= SEND_SHUTDOWN;
961 tcp_shutdown(ssk, SEND_SHUTDOWN);
962 ssk->sk_allocation = saved_allocation;
966 #define pr_fallback(a) pr_debug("%s:fallback to TCP (msk=%p)", __func__, a)
968 static inline bool mptcp_check_infinite_map(struct sk_buff *skb)
970 struct mptcp_ext *mpext;
972 mpext = skb ? mptcp_get_ext(skb) : NULL;
973 if (mpext && mpext->infinite_map)
979 static inline bool is_active_ssk(struct mptcp_subflow_context *subflow)
981 return (subflow->request_mptcp || subflow->request_join);
984 static inline bool subflow_simultaneous_connect(struct sock *sk)
986 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
988 return sk->sk_state == TCP_ESTABLISHED &&
989 is_active_ssk(subflow) &&
990 !subflow->conn_finished;
993 #ifdef CONFIG_SYN_COOKIES
994 void subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req,
995 struct sk_buff *skb);
996 bool mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req,
997 struct sk_buff *skb);
998 void __init mptcp_join_cookie_init(void);
1001 subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req,
1002 struct sk_buff *skb) {}
1004 mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req,
1005 struct sk_buff *skb)
1010 static inline void mptcp_join_cookie_init(void) {}
1013 #endif /* __MPTCP_PROTOCOL_H */