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;
292 struct work_struct work;
293 struct sk_buff *ooo_last_skb;
294 struct rb_root out_of_order_queue;
295 struct sk_buff_head receive_queue;
296 struct list_head conn_list;
297 struct list_head rtx_queue;
298 struct mptcp_data_frag *first_pending;
299 struct list_head join_list;
300 struct socket *subflow; /* outgoing connect/listener/!mp_capable */
302 struct mptcp_pm_data pm;
304 u32 space; /* bytes copied in last measurement window */
305 u32 copied; /* bytes copied in this measurement window */
306 u64 time; /* start time of measurement window */
307 u64 rtt_us; /* last maximum rtt of subflows */
311 char ca_name[TCP_CA_NAME_MAX];
312 struct mptcp_sock *dl_next;
315 #define mptcp_data_lock(sk) spin_lock_bh(&(sk)->sk_lock.slock)
316 #define mptcp_data_unlock(sk) spin_unlock_bh(&(sk)->sk_lock.slock)
318 #define mptcp_for_each_subflow(__msk, __subflow) \
319 list_for_each_entry(__subflow, &((__msk)->conn_list), node)
320 #define mptcp_for_each_subflow_safe(__msk, __subflow, __tmp) \
321 list_for_each_entry_safe(__subflow, __tmp, &((__msk)->conn_list), node)
323 static inline void msk_owned_by_me(const struct mptcp_sock *msk)
325 sock_owned_by_me((const struct sock *)msk);
328 static inline struct mptcp_sock *mptcp_sk(const struct sock *sk)
330 return (struct mptcp_sock *)sk;
333 /* the msk socket don't use the backlog, also account for the bulk
336 static inline int __mptcp_rmem(const struct sock *sk)
338 return atomic_read(&sk->sk_rmem_alloc) - READ_ONCE(mptcp_sk(sk)->rmem_released);
341 static inline int __mptcp_space(const struct sock *sk)
343 return tcp_win_from_space(sk, READ_ONCE(sk->sk_rcvbuf) - __mptcp_rmem(sk));
346 static inline struct mptcp_data_frag *mptcp_send_head(const struct sock *sk)
348 const struct mptcp_sock *msk = mptcp_sk(sk);
350 return READ_ONCE(msk->first_pending);
353 static inline struct mptcp_data_frag *mptcp_send_next(struct sock *sk)
355 struct mptcp_sock *msk = mptcp_sk(sk);
356 struct mptcp_data_frag *cur;
358 cur = msk->first_pending;
359 return list_is_last(&cur->list, &msk->rtx_queue) ? NULL :
360 list_next_entry(cur, list);
363 static inline struct mptcp_data_frag *mptcp_pending_tail(const struct sock *sk)
365 struct mptcp_sock *msk = mptcp_sk(sk);
367 if (!msk->first_pending)
370 if (WARN_ON_ONCE(list_empty(&msk->rtx_queue)))
373 return list_last_entry(&msk->rtx_queue, struct mptcp_data_frag, list);
376 static inline struct mptcp_data_frag *mptcp_rtx_head(const struct sock *sk)
378 struct mptcp_sock *msk = mptcp_sk(sk);
380 if (msk->snd_una == READ_ONCE(msk->snd_nxt))
383 return list_first_entry_or_null(&msk->rtx_queue, struct mptcp_data_frag, list);
386 struct csum_pseudo_header {
393 struct mptcp_subflow_request_sock {
394 struct tcp_request_sock sk;
409 struct mptcp_sock *msk;
410 struct hlist_nulls_node token_node;
413 static inline struct mptcp_subflow_request_sock *
414 mptcp_subflow_rsk(const struct request_sock *rsk)
416 return (struct mptcp_subflow_request_sock *)rsk;
419 enum mptcp_data_avail {
420 MPTCP_SUBFLOW_NODATA,
421 MPTCP_SUBFLOW_DATA_AVAIL,
424 struct mptcp_delegated_action {
425 struct napi_struct napi;
426 struct list_head head;
429 DECLARE_PER_CPU(struct mptcp_delegated_action, mptcp_delegated_actions);
431 #define MPTCP_DELEGATE_SEND 0
432 #define MPTCP_DELEGATE_ACK 1
434 /* MPTCP subflow context */
435 struct mptcp_subflow_context {
436 struct list_head node;/* conn_list of subflows */
440 unsigned long avg_pacing_rate; /* protected by msk socket lock */
451 __wsum map_data_csum;
453 u32 request_mptcp : 1, /* send MP_CAPABLE */
454 request_join : 1, /* send MP_JOIN */
456 mp_capable : 1, /* remote is MPTCP capable */
457 mp_join : 1, /* remote is JOINing */
458 fully_established : 1, /* path validated */
459 pm_notified : 1, /* PM hook called for established status */
469 send_infinite_map : 1,
471 can_ack : 1, /* only after processing the remote a key */
472 disposable : 1, /* ctx can be free at ulp release time */
473 stale : 1, /* unable to snd/rcv data, do not use for xmit */
474 local_id_valid : 1, /* local_id is correctly initialized */
475 valid_csum_seen : 1; /* at least one csum validated */
476 enum mptcp_data_avail data_avail;
481 u8 hmac[MPTCPOPT_HMAC_LEN];
485 u8 reset_transient:1;
489 long delegated_status;
490 unsigned long fail_tout;
494 struct list_head delegated_node; /* link into delegated_action, protected by local BH */
497 u32 stale_rcv_tstamp;
499 struct sock *tcp_sock; /* tcp sk backpointer */
500 struct sock *conn; /* parent mptcp_sock */
501 const struct inet_connection_sock_af_ops *icsk_af_ops;
502 void (*tcp_state_change)(struct sock *sk);
503 void (*tcp_error_report)(struct sock *sk);
508 static inline struct mptcp_subflow_context *
509 mptcp_subflow_ctx(const struct sock *sk)
511 struct inet_connection_sock *icsk = inet_csk(sk);
513 /* Use RCU on icsk_ulp_data only for sock diag code */
514 return (__force struct mptcp_subflow_context *)icsk->icsk_ulp_data;
517 static inline struct sock *
518 mptcp_subflow_tcp_sock(const struct mptcp_subflow_context *subflow)
520 return subflow->tcp_sock;
524 mptcp_subflow_ctx_reset(struct mptcp_subflow_context *subflow)
526 memset(&subflow->reset, 0, sizeof(subflow->reset));
527 subflow->request_mptcp = 1;
531 mptcp_subflow_get_map_offset(const struct mptcp_subflow_context *subflow)
533 return tcp_sk(mptcp_subflow_tcp_sock(subflow))->copied_seq -
534 subflow->ssn_offset -
535 subflow->map_subflow_seq;
539 mptcp_subflow_get_mapped_dsn(const struct mptcp_subflow_context *subflow)
541 return subflow->map_seq + mptcp_subflow_get_map_offset(subflow);
544 void mptcp_subflow_process_delegated(struct sock *ssk);
546 static inline void mptcp_subflow_delegate(struct mptcp_subflow_context *subflow, int action)
548 struct mptcp_delegated_action *delegated;
551 /* the caller held the subflow bh socket lock */
552 lockdep_assert_in_softirq();
554 /* The implied barrier pairs with mptcp_subflow_delegated_done(), and
555 * ensures the below list check sees list updates done prior to status
558 if (!test_and_set_bit(action, &subflow->delegated_status)) {
559 /* still on delegated list from previous scheduling */
560 if (!list_empty(&subflow->delegated_node))
563 delegated = this_cpu_ptr(&mptcp_delegated_actions);
564 schedule = list_empty(&delegated->head);
565 list_add_tail(&subflow->delegated_node, &delegated->head);
566 sock_hold(mptcp_subflow_tcp_sock(subflow));
568 napi_schedule(&delegated->napi);
572 static inline struct mptcp_subflow_context *
573 mptcp_subflow_delegated_next(struct mptcp_delegated_action *delegated)
575 struct mptcp_subflow_context *ret;
577 if (list_empty(&delegated->head))
580 ret = list_first_entry(&delegated->head, struct mptcp_subflow_context, delegated_node);
581 list_del_init(&ret->delegated_node);
585 static inline bool mptcp_subflow_has_delegated_action(const struct mptcp_subflow_context *subflow)
587 return !!READ_ONCE(subflow->delegated_status);
590 static inline void mptcp_subflow_delegated_done(struct mptcp_subflow_context *subflow, int action)
592 /* pairs with mptcp_subflow_delegate, ensures delegate_node is updated before
593 * touching the status bit
596 clear_bit(action, &subflow->delegated_status);
599 int mptcp_is_enabled(const struct net *net);
600 unsigned int mptcp_get_add_addr_timeout(const struct net *net);
601 int mptcp_is_checksum_enabled(const struct net *net);
602 int mptcp_allow_join_id0(const struct net *net);
603 unsigned int mptcp_stale_loss_cnt(const struct net *net);
604 int mptcp_get_pm_type(const struct net *net);
605 void mptcp_copy_inaddrs(struct sock *msk, const struct sock *ssk);
606 void mptcp_subflow_fully_established(struct mptcp_subflow_context *subflow,
607 struct mptcp_options_received *mp_opt);
608 bool __mptcp_retransmit_pending_data(struct sock *sk);
609 void mptcp_check_and_set_pending(struct sock *sk);
610 void __mptcp_push_pending(struct sock *sk, unsigned int flags);
611 bool mptcp_subflow_data_available(struct sock *sk);
612 void __init mptcp_subflow_init(void);
613 void mptcp_subflow_shutdown(struct sock *sk, struct sock *ssk, int how);
614 void mptcp_close_ssk(struct sock *sk, struct sock *ssk,
615 struct mptcp_subflow_context *subflow);
616 void __mptcp_subflow_send_ack(struct sock *ssk);
617 void mptcp_subflow_reset(struct sock *ssk);
618 void mptcp_sock_graft(struct sock *sk, struct socket *parent);
619 struct socket *__mptcp_nmpc_socket(const struct mptcp_sock *msk);
620 bool __mptcp_close(struct sock *sk, long timeout);
621 void mptcp_cancel_work(struct sock *sk);
623 bool mptcp_addresses_equal(const struct mptcp_addr_info *a,
624 const struct mptcp_addr_info *b, bool use_port);
626 /* called with sk socket lock held */
627 int __mptcp_subflow_connect(struct sock *sk, const struct mptcp_addr_info *loc,
628 const struct mptcp_addr_info *remote);
629 int mptcp_subflow_create_socket(struct sock *sk, unsigned short family,
630 struct socket **new_sock);
631 void mptcp_info2sockaddr(const struct mptcp_addr_info *info,
632 struct sockaddr_storage *addr,
633 unsigned short family);
635 static inline bool __tcp_can_send(const struct sock *ssk)
637 /* only send if our side has not closed yet */
638 return ((1 << inet_sk_state_load(ssk)) & (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT));
641 static inline bool __mptcp_subflow_active(struct mptcp_subflow_context *subflow)
643 /* can't send if JOIN hasn't completed yet (i.e. is usable for mptcp) */
644 if (subflow->request_join && !subflow->fully_established)
647 return __tcp_can_send(mptcp_subflow_tcp_sock(subflow));
650 void mptcp_subflow_set_active(struct mptcp_subflow_context *subflow);
652 bool mptcp_subflow_active(struct mptcp_subflow_context *subflow);
654 void mptcp_subflow_drop_ctx(struct sock *ssk);
656 static inline void mptcp_subflow_tcp_fallback(struct sock *sk,
657 struct mptcp_subflow_context *ctx)
659 sk->sk_data_ready = sock_def_readable;
660 sk->sk_state_change = ctx->tcp_state_change;
661 sk->sk_write_space = sk_stream_write_space;
662 sk->sk_error_report = ctx->tcp_error_report;
664 inet_csk(sk)->icsk_af_ops = ctx->icsk_af_ops;
667 void __init mptcp_proto_init(void);
668 #if IS_ENABLED(CONFIG_MPTCP_IPV6)
669 int __init mptcp_proto_v6_init(void);
672 struct sock *mptcp_sk_clone(const struct sock *sk,
673 const struct mptcp_options_received *mp_opt,
674 struct request_sock *req);
675 void mptcp_get_options(const struct sk_buff *skb,
676 struct mptcp_options_received *mp_opt);
678 void mptcp_finish_connect(struct sock *sk);
679 void __mptcp_set_connected(struct sock *sk);
680 void mptcp_reset_timeout(struct mptcp_sock *msk, unsigned long fail_tout);
681 static inline bool mptcp_is_fully_established(struct sock *sk)
683 return inet_sk_state_load(sk) == TCP_ESTABLISHED &&
684 READ_ONCE(mptcp_sk(sk)->fully_established);
686 void mptcp_rcv_space_init(struct mptcp_sock *msk, const struct sock *ssk);
687 void mptcp_data_ready(struct sock *sk, struct sock *ssk);
688 bool mptcp_finish_join(struct sock *sk);
689 bool mptcp_schedule_work(struct sock *sk);
690 int mptcp_setsockopt(struct sock *sk, int level, int optname,
691 sockptr_t optval, unsigned int optlen);
692 int mptcp_getsockopt(struct sock *sk, int level, int optname,
693 char __user *optval, int __user *option);
695 u64 __mptcp_expand_seq(u64 old_seq, u64 cur_seq);
696 static inline u64 mptcp_expand_seq(u64 old_seq, u64 cur_seq, bool use_64bit)
701 return __mptcp_expand_seq(old_seq, cur_seq);
703 void __mptcp_check_push(struct sock *sk, struct sock *ssk);
704 void __mptcp_data_acked(struct sock *sk);
705 void __mptcp_error_report(struct sock *sk);
706 void mptcp_subflow_eof(struct sock *sk);
707 bool mptcp_update_rcv_data_fin(struct mptcp_sock *msk, u64 data_fin_seq, bool use_64bit);
708 static inline bool mptcp_data_fin_enabled(const struct mptcp_sock *msk)
710 return READ_ONCE(msk->snd_data_fin_enable) &&
711 READ_ONCE(msk->write_seq) == READ_ONCE(msk->snd_nxt);
714 static inline bool mptcp_propagate_sndbuf(struct sock *sk, struct sock *ssk)
716 if ((sk->sk_userlocks & SOCK_SNDBUF_LOCK) || ssk->sk_sndbuf <= READ_ONCE(sk->sk_sndbuf))
719 WRITE_ONCE(sk->sk_sndbuf, ssk->sk_sndbuf);
723 static inline void mptcp_write_space(struct sock *sk)
725 if (sk_stream_is_writeable(sk)) {
726 /* pairs with memory barrier in mptcp_poll */
728 if (test_and_clear_bit(MPTCP_NOSPACE, &mptcp_sk(sk)->flags))
729 sk_stream_write_space(sk);
733 void mptcp_destroy_common(struct mptcp_sock *msk, unsigned int flags);
735 #define MPTCP_TOKEN_MAX_RETRIES 4
737 void __init mptcp_token_init(void);
738 static inline void mptcp_token_init_request(struct request_sock *req)
740 mptcp_subflow_rsk(req)->token_node.pprev = NULL;
743 int mptcp_token_new_request(struct request_sock *req);
744 void mptcp_token_destroy_request(struct request_sock *req);
745 int mptcp_token_new_connect(struct sock *sk);
746 void mptcp_token_accept(struct mptcp_subflow_request_sock *r,
747 struct mptcp_sock *msk);
748 bool mptcp_token_exists(u32 token);
749 struct mptcp_sock *mptcp_token_get_sock(struct net *net, u32 token);
750 struct mptcp_sock *mptcp_token_iter_next(const struct net *net, long *s_slot,
752 void mptcp_token_destroy(struct mptcp_sock *msk);
754 void mptcp_crypto_key_sha(u64 key, u32 *token, u64 *idsn);
756 void mptcp_crypto_hmac_sha(u64 key1, u64 key2, u8 *msg, int len, void *hmac);
757 __sum16 __mptcp_make_csum(u64 data_seq, u32 subflow_seq, u16 data_len, __wsum sum);
759 void __init mptcp_pm_init(void);
760 void mptcp_pm_data_init(struct mptcp_sock *msk);
761 void mptcp_pm_data_reset(struct mptcp_sock *msk);
762 int mptcp_pm_parse_addr(struct nlattr *attr, struct genl_info *info,
763 struct mptcp_addr_info *addr);
764 int mptcp_pm_parse_entry(struct nlattr *attr, struct genl_info *info,
766 struct mptcp_pm_addr_entry *entry);
767 bool mptcp_pm_addr_families_match(const struct sock *sk,
768 const struct mptcp_addr_info *loc,
769 const struct mptcp_addr_info *rem);
770 void mptcp_pm_subflow_chk_stale(const struct mptcp_sock *msk, struct sock *ssk);
771 void mptcp_pm_nl_subflow_chk_stale(const struct mptcp_sock *msk, struct sock *ssk);
772 void mptcp_pm_new_connection(struct mptcp_sock *msk, const struct sock *ssk, int server_side);
773 void mptcp_pm_fully_established(struct mptcp_sock *msk, const struct sock *ssk, gfp_t gfp);
774 bool mptcp_pm_allow_new_subflow(struct mptcp_sock *msk);
775 void mptcp_pm_connection_closed(struct mptcp_sock *msk);
776 void mptcp_pm_subflow_established(struct mptcp_sock *msk);
777 bool mptcp_pm_nl_check_work_pending(struct mptcp_sock *msk);
778 void mptcp_pm_subflow_check_next(struct mptcp_sock *msk, const struct sock *ssk,
779 const struct mptcp_subflow_context *subflow);
780 void mptcp_pm_add_addr_received(const struct sock *ssk,
781 const struct mptcp_addr_info *addr);
782 void mptcp_pm_add_addr_echoed(struct mptcp_sock *msk,
783 const struct mptcp_addr_info *addr);
784 void mptcp_pm_add_addr_send_ack(struct mptcp_sock *msk);
785 void mptcp_pm_nl_addr_send_ack(struct mptcp_sock *msk);
786 void mptcp_pm_rm_addr_received(struct mptcp_sock *msk,
787 const struct mptcp_rm_list *rm_list);
788 void mptcp_pm_mp_prio_received(struct sock *sk, u8 bkup);
789 void mptcp_pm_mp_fail_received(struct sock *sk, u64 fail_seq);
790 int mptcp_pm_nl_mp_prio_send_ack(struct mptcp_sock *msk,
791 struct mptcp_addr_info *addr,
792 struct mptcp_addr_info *rem,
794 bool mptcp_pm_alloc_anno_list(struct mptcp_sock *msk,
795 const struct mptcp_pm_addr_entry *entry);
796 void mptcp_pm_free_anno_list(struct mptcp_sock *msk);
797 bool mptcp_pm_sport_in_anno_list(struct mptcp_sock *msk, const struct sock *sk);
798 struct mptcp_pm_add_entry *
799 mptcp_pm_del_add_timer(struct mptcp_sock *msk,
800 const struct mptcp_addr_info *addr, bool check_id);
801 struct mptcp_pm_add_entry *
802 mptcp_lookup_anno_list_by_saddr(const struct mptcp_sock *msk,
803 const struct mptcp_addr_info *addr);
804 int mptcp_pm_get_flags_and_ifindex_by_id(struct mptcp_sock *msk,
806 u8 *flags, int *ifindex);
807 int mptcp_userspace_pm_get_flags_and_ifindex_by_id(struct mptcp_sock *msk,
809 u8 *flags, int *ifindex);
810 int mptcp_userspace_pm_set_flags(struct net *net, struct nlattr *token,
811 struct mptcp_pm_addr_entry *loc,
812 struct mptcp_pm_addr_entry *rem, u8 bkup);
813 int mptcp_pm_announce_addr(struct mptcp_sock *msk,
814 const struct mptcp_addr_info *addr,
816 int mptcp_pm_remove_addr(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list);
817 int mptcp_pm_remove_subflow(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list);
818 void mptcp_pm_remove_addrs_and_subflows(struct mptcp_sock *msk,
819 struct list_head *rm_list);
821 int mptcp_userspace_pm_append_new_local_addr(struct mptcp_sock *msk,
822 struct mptcp_pm_addr_entry *entry);
823 void mptcp_free_local_addr_list(struct mptcp_sock *msk);
824 int mptcp_nl_cmd_announce(struct sk_buff *skb, struct genl_info *info);
825 int mptcp_nl_cmd_remove(struct sk_buff *skb, struct genl_info *info);
826 int mptcp_nl_cmd_sf_create(struct sk_buff *skb, struct genl_info *info);
827 int mptcp_nl_cmd_sf_destroy(struct sk_buff *skb, struct genl_info *info);
829 void mptcp_event(enum mptcp_event_type type, const struct mptcp_sock *msk,
830 const struct sock *ssk, gfp_t gfp);
831 void mptcp_event_addr_announced(const struct sock *ssk, const struct mptcp_addr_info *info);
832 void mptcp_event_addr_removed(const struct mptcp_sock *msk, u8 id);
833 bool mptcp_userspace_pm_active(const struct mptcp_sock *msk);
835 static inline bool mptcp_pm_should_add_signal(struct mptcp_sock *msk)
837 return READ_ONCE(msk->pm.addr_signal) &
838 (BIT(MPTCP_ADD_ADDR_SIGNAL) | BIT(MPTCP_ADD_ADDR_ECHO));
841 static inline bool mptcp_pm_should_add_signal_addr(struct mptcp_sock *msk)
843 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_SIGNAL);
846 static inline bool mptcp_pm_should_add_signal_echo(struct mptcp_sock *msk)
848 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_ECHO);
851 static inline bool mptcp_pm_should_rm_signal(struct mptcp_sock *msk)
853 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_RM_ADDR_SIGNAL);
856 static inline bool mptcp_pm_is_userspace(const struct mptcp_sock *msk)
858 return READ_ONCE(msk->pm.pm_type) == MPTCP_PM_TYPE_USERSPACE;
861 static inline bool mptcp_pm_is_kernel(const struct mptcp_sock *msk)
863 return READ_ONCE(msk->pm.pm_type) == MPTCP_PM_TYPE_KERNEL;
866 static inline unsigned int mptcp_add_addr_len(int family, bool echo, bool port)
868 u8 len = TCPOLEN_MPTCP_ADD_ADDR_BASE;
870 if (family == AF_INET6)
871 len = TCPOLEN_MPTCP_ADD_ADDR6_BASE;
873 len += MPTCPOPT_THMAC_LEN;
874 /* account for 2 trailing 'nop' options */
876 len += TCPOLEN_MPTCP_PORT_LEN + TCPOLEN_MPTCP_PORT_ALIGN;
881 static inline int mptcp_rm_addr_len(const struct mptcp_rm_list *rm_list)
883 if (rm_list->nr == 0 || rm_list->nr > MPTCP_RM_IDS_MAX)
886 return TCPOLEN_MPTCP_RM_ADDR_BASE + roundup(rm_list->nr - 1, 4) + 1;
889 bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, const struct sk_buff *skb,
890 unsigned int opt_size, unsigned int remaining,
891 struct mptcp_addr_info *addr, bool *echo,
892 bool *drop_other_suboptions);
893 bool mptcp_pm_rm_addr_signal(struct mptcp_sock *msk, unsigned int remaining,
894 struct mptcp_rm_list *rm_list);
895 int mptcp_pm_get_local_id(struct mptcp_sock *msk, struct sock_common *skc);
896 int mptcp_userspace_pm_get_local_id(struct mptcp_sock *msk, struct mptcp_addr_info *skc);
898 void __init mptcp_pm_nl_init(void);
899 void mptcp_pm_nl_work(struct mptcp_sock *msk);
900 void mptcp_pm_nl_rm_subflow_received(struct mptcp_sock *msk,
901 const struct mptcp_rm_list *rm_list);
902 int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, struct sock_common *skc);
903 unsigned int mptcp_pm_get_add_addr_signal_max(const struct mptcp_sock *msk);
904 unsigned int mptcp_pm_get_add_addr_accept_max(const struct mptcp_sock *msk);
905 unsigned int mptcp_pm_get_subflows_max(const struct mptcp_sock *msk);
906 unsigned int mptcp_pm_get_local_addr_max(const struct mptcp_sock *msk);
908 /* called under PM lock */
909 static inline void __mptcp_pm_close_subflow(struct mptcp_sock *msk)
911 if (--msk->pm.subflows < mptcp_pm_get_subflows_max(msk))
912 WRITE_ONCE(msk->pm.accept_subflow, true);
915 static inline void mptcp_pm_close_subflow(struct mptcp_sock *msk)
917 spin_lock_bh(&msk->pm.lock);
918 __mptcp_pm_close_subflow(msk);
919 spin_unlock_bh(&msk->pm.lock);
922 void mptcp_sockopt_sync(struct mptcp_sock *msk, struct sock *ssk);
923 void mptcp_sockopt_sync_locked(struct mptcp_sock *msk, struct sock *ssk);
925 static inline struct mptcp_ext *mptcp_get_ext(const struct sk_buff *skb)
927 return (struct mptcp_ext *)skb_ext_find(skb, SKB_EXT_MPTCP);
930 void mptcp_diag_subflow_init(struct tcp_ulp_ops *ops);
932 static inline bool __mptcp_check_fallback(const struct mptcp_sock *msk)
934 return test_bit(MPTCP_FALLBACK_DONE, &msk->flags);
937 static inline bool mptcp_check_fallback(const struct sock *sk)
939 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
940 struct mptcp_sock *msk = mptcp_sk(subflow->conn);
942 return __mptcp_check_fallback(msk);
945 static inline void __mptcp_do_fallback(struct mptcp_sock *msk)
947 if (test_bit(MPTCP_FALLBACK_DONE, &msk->flags)) {
948 pr_debug("TCP fallback already done (msk=%p)", msk);
951 set_bit(MPTCP_FALLBACK_DONE, &msk->flags);
954 static inline void mptcp_do_fallback(struct sock *ssk)
956 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk);
957 struct sock *sk = subflow->conn;
958 struct mptcp_sock *msk;
961 __mptcp_do_fallback(msk);
962 if (READ_ONCE(msk->snd_data_fin_enable) && !(ssk->sk_shutdown & SEND_SHUTDOWN)) {
963 gfp_t saved_allocation = ssk->sk_allocation;
965 /* we are in a atomic (BH) scope, override ssk default for data
968 ssk->sk_allocation = GFP_ATOMIC;
969 ssk->sk_shutdown |= SEND_SHUTDOWN;
970 tcp_shutdown(ssk, SEND_SHUTDOWN);
971 ssk->sk_allocation = saved_allocation;
975 #define pr_fallback(a) pr_debug("%s:fallback to TCP (msk=%p)", __func__, a)
977 static inline bool mptcp_check_infinite_map(struct sk_buff *skb)
979 struct mptcp_ext *mpext;
981 mpext = skb ? mptcp_get_ext(skb) : NULL;
982 if (mpext && mpext->infinite_map)
988 static inline bool is_active_ssk(struct mptcp_subflow_context *subflow)
990 return (subflow->request_mptcp || subflow->request_join);
993 static inline bool subflow_simultaneous_connect(struct sock *sk)
995 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
997 return sk->sk_state == TCP_ESTABLISHED &&
998 is_active_ssk(subflow) &&
999 !subflow->conn_finished;
1002 #ifdef CONFIG_SYN_COOKIES
1003 void subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req,
1004 struct sk_buff *skb);
1005 bool mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req,
1006 struct sk_buff *skb);
1007 void __init mptcp_join_cookie_init(void);
1010 subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req,
1011 struct sk_buff *skb) {}
1013 mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req,
1014 struct sk_buff *skb)
1019 static inline void mptcp_join_cookie_init(void) {}
1022 #endif /* __MPTCP_PROTOCOL_H */