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mptcp: implement wmem reservation
[linux-2.6-block.git] / net / mptcp / protocol.h
CommitLineData
f870fa0b
MM		 1/* SPDX-License-Identifier: GPL-2.0 */
2/* Multipath TCP
3 *
4 * Copyright (c) 2017 - 2019, Intel Corporation.
5 */
6
7#ifndef __MPTCP_PROTOCOL_H
8#define __MPTCP_PROTOCOL_H
9
79c0949e
PK		 10#include <linux/random.h>
11#include <net/tcp.h>
12#include <net/inet_connection_sock.h>
13
cc7972ea 14#define MPTCP_SUPPORTED_VERSION 1
eda7acdd
PK		 15
16/* MPTCP option bits */
17#define OPTION_MPTCP_MPC_SYN BIT(0)
18#define OPTION_MPTCP_MPC_SYNACK BIT(1)
19#define OPTION_MPTCP_MPC_ACK BIT(2)
f296234c
PK		 20#define OPTION_MPTCP_MPJ_SYN BIT(3)
21#define OPTION_MPTCP_MPJ_SYNACK BIT(4)
22#define OPTION_MPTCP_MPJ_ACK BIT(5)
3df523ab
PK		 23#define OPTION_MPTCP_ADD_ADDR BIT(6)
24#define OPTION_MPTCP_ADD_ADDR6 BIT(7)
25#define OPTION_MPTCP_RM_ADDR BIT(8)
eda7acdd
PK		 26
27/* MPTCP option subtypes */
28#define MPTCPOPT_MP_CAPABLE 0
29#define MPTCPOPT_MP_JOIN 1
30#define MPTCPOPT_DSS 2
31#define MPTCPOPT_ADD_ADDR 3
32#define MPTCPOPT_RM_ADDR 4
33#define MPTCPOPT_MP_PRIO 5
34#define MPTCPOPT_MP_FAIL 6
35#define MPTCPOPT_MP_FASTCLOSE 7
36
37/* MPTCP suboption lengths */
cc7972ea 38#define TCPOLEN_MPTCP_MPC_SYN 4
eda7acdd
PK		 39#define TCPOLEN_MPTCP_MPC_SYNACK 12
40#define TCPOLEN_MPTCP_MPC_ACK 20
cc7972ea 41#define TCPOLEN_MPTCP_MPC_ACK_DATA 22
f296234c
PK		 42#define TCPOLEN_MPTCP_MPJ_SYN 12
43#define TCPOLEN_MPTCP_MPJ_SYNACK 16
44#define TCPOLEN_MPTCP_MPJ_ACK 24
6d0060f6 45#define TCPOLEN_MPTCP_DSS_BASE 4
648ef4b8 46#define TCPOLEN_MPTCP_DSS_ACK32 4
6d0060f6 47#define TCPOLEN_MPTCP_DSS_ACK64 8
648ef4b8 48#define TCPOLEN_MPTCP_DSS_MAP32 10
6d0060f6
MM		 49#define TCPOLEN_MPTCP_DSS_MAP64 14
50#define TCPOLEN_MPTCP_DSS_CHECKSUM 2
3df523ab
PK		 51#define TCPOLEN_MPTCP_ADD_ADDR 16
52#define TCPOLEN_MPTCP_ADD_ADDR_PORT 18
53#define TCPOLEN_MPTCP_ADD_ADDR_BASE 8
54#define TCPOLEN_MPTCP_ADD_ADDR_BASE_PORT 10
55#define TCPOLEN_MPTCP_ADD_ADDR6 28
56#define TCPOLEN_MPTCP_ADD_ADDR6_PORT 30
57#define TCPOLEN_MPTCP_ADD_ADDR6_BASE 20
58#define TCPOLEN_MPTCP_ADD_ADDR6_BASE_PORT 22
59#define TCPOLEN_MPTCP_PORT_LEN 2
60#define TCPOLEN_MPTCP_RM_ADDR_BASE 4
eda7acdd 61
ec3edaa7 62/* MPTCP MP_JOIN flags */
f296234c
PK		 63#define MPTCPOPT_BACKUP BIT(0)
64#define MPTCPOPT_HMAC_LEN 20
ec3edaa7 65#define MPTCPOPT_THMAC_LEN 8
f296234c 66
eda7acdd
PK		 67/* MPTCP MP_CAPABLE flags */
68#define MPTCP_VERSION_MASK (0x0F)
69#define MPTCP_CAP_CHECKSUM_REQD BIT(7)
70#define MPTCP_CAP_EXTENSIBILITY BIT(6)
65492c5a 71#define MPTCP_CAP_HMAC_SHA256 BIT(0)
eda7acdd
PK		 72#define MPTCP_CAP_FLAG_MASK (0x3F)
73
6d0060f6
MM		 74/* MPTCP DSS flags */
75#define MPTCP_DSS_DATA_FIN BIT(4)
76#define MPTCP_DSS_DSN64 BIT(3)
77#define MPTCP_DSS_HAS_MAP BIT(2)
78#define MPTCP_DSS_ACK64 BIT(1)
79#define MPTCP_DSS_HAS_ACK BIT(0)
648ef4b8
MM		 80#define MPTCP_DSS_FLAG_MASK (0x1F)
81
3df523ab
PK		 82/* MPTCP ADD_ADDR flags */
83#define MPTCP_ADDR_ECHO BIT(0)
3df523ab
PK		 84#define MPTCP_ADDR_IPVERSION_4 4
85#define MPTCP_ADDR_IPVERSION_6 6
86
648ef4b8 87/* MPTCP socket flags */
d99bfed5 88#define MPTCP_DATA_READY 0
8edf0864 89#define MPTCP_NOSPACE 1
3b1d6210 90#define MPTCP_WORK_RTX 2
59832e24 91#define MPTCP_WORK_EOF 3
e1ff9e82 92#define MPTCP_FALLBACK_DONE 4
0e4f35d7 93#define MPTCP_WORK_CLOSE_SUBFLOW 5
6d0060f6 94
eaa2ffab
PA		 95static inline bool before64(__u64 seq1, __u64 seq2)
96{
97 return (__s64)(seq1 - seq2) < 0;
98}
99
100#define after64(seq2, seq1) before64(seq1, seq2)
101
cfde141e
PA		 102struct mptcp_options_received {
103 u64 sndr_key;
104 u64 rcvr_key;
105 u64 data_ack;
106 u64 data_seq;
107 u32 subflow_seq;
108 u16 data_len;
109 u16 mp_capable : 1,
110 mp_join : 1,
111 dss : 1,
112 add_addr : 1,
113 rm_addr : 1,
114 family : 4,
115 echo : 1,
116 backup : 1;
117 u32 token;
118 u32 nonce;
119 u64 thmac;
120 u8 hmac[20];
121 u8 join_id;
122 u8 use_map:1,
123 dsn64:1,
124 data_fin:1,
125 use_ack:1,
126 ack64:1,
127 mpc_map:1,
128 __unused:2;
129 u8 addr_id;
130 u8 rm_id;
131 union {
132 struct in_addr addr;
133#if IS_ENABLED(CONFIG_MPTCP_IPV6)
134 struct in6_addr addr6;
135#endif
136 };
137 u64 ahmac;
138 u16 port;
139};
140
3df523ab
PK		 141static inline __be32 mptcp_option(u8 subopt, u8 len, u8 nib, u8 field)
142{
143 return htonl((TCPOPT_MPTCP << 24) | (len << 16) | (subopt << 12) |
144 ((nib & 0xF) << 8) | field);
145}
146
1b1c7a0e
PK		 147struct mptcp_addr_info {
148 sa_family_t family;
149 __be16 port;
150 u8 id;
ef0da3b8
PA		 151 u8 flags;
152 int ifindex;
1b1c7a0e
PK		 153 union {
154 struct in_addr addr;
155#if IS_ENABLED(CONFIG_MPTCP_IPV6)
156 struct in6_addr addr6;
157#endif
158 };
159};
160
161enum mptcp_pm_status {
162 MPTCP_PM_ADD_ADDR_RECEIVED,
84dfe367 163 MPTCP_PM_ADD_ADDR_SEND_ACK,
d0876b22 164 MPTCP_PM_RM_ADDR_RECEIVED,
1b1c7a0e
PK		 165 MPTCP_PM_ESTABLISHED,
166 MPTCP_PM_SUBFLOW_ESTABLISHED,
167};
168
d91d322a
GT		 169enum mptcp_add_addr_status {
170 MPTCP_ADD_ADDR_SIGNAL,
171 MPTCP_ADD_ADDR_ECHO,
84dfe367 172 MPTCP_ADD_ADDR_IPV6,
d91d322a
GT		 173};
174
1b1c7a0e
PK		 175struct mptcp_pm_data {
176 struct mptcp_addr_info local;
177 struct mptcp_addr_info remote;
b6c08380 178 struct list_head anno_list;
1b1c7a0e
PK		 179
180 spinlock_t lock; /*protects the whole PM data */
181
d91d322a 182 u8 add_addr_signal;
5cb104ae 183 bool rm_addr_signal;
1b1c7a0e
PK		 184 bool server_side;
185 bool work_pending;
186 bool accept_addr;
187 bool accept_subflow;
188 u8 add_addr_signaled;
189 u8 add_addr_accepted;
190 u8 local_addr_used;
191 u8 subflows;
192 u8 add_addr_signal_max;
193 u8 add_addr_accept_max;
194 u8 local_addr_max;
195 u8 subflows_max;
196 u8 status;
5cb104ae 197 u8 rm_id;
1b1c7a0e
PK		 198};
199
18b683bf
PA		 200struct mptcp_data_frag {
201 struct list_head list;
202 u64 data_seq;
f0e6a4cf
PA		 203 u16 data_len;
204 u16 offset;
205 u16 overhead;
206 u16 already_sent;
18b683bf
PA		 207 struct page *page;
208};
209
f870fa0b
MM		 210/* MPTCP connection sock */
211struct mptcp_sock {
212 /* inet_connection_sock must be the first member */
213 struct inet_connection_sock sk;
cec37a6e
PK		 214 u64 local_key;
215 u64 remote_key;
6d0060f6 216 u64 write_seq;
eaa2ffab 217 u64 snd_nxt;
6d0060f6 218 u64 ack_seq;
fa3fe2b1 219 u64 rcv_wnd_sent;
3721b9b6 220 u64 rcv_data_fin_seq;
e93da928 221 int wmem_reserved;
d5f49190
PA		 222 struct sock *last_snd;
223 int snd_burst;
ea4ca586 224 int old_wspace;
cc9d2566 225 atomic64_t snd_una;
6f8a612a 226 atomic64_t wnd_end;
b51f9b80 227 unsigned long timer_ival;
79c0949e 228 u32 token;
ea4ca586 229 int rmem_pending;
648ef4b8 230 unsigned long flags;
d22f4988 231 bool can_ack;
b93df08c 232 bool fully_established;
3721b9b6 233 bool rcv_data_fin;
7279da61 234 bool snd_data_fin_enable;
37198e93 235 bool use_64bit_ack; /* Set when we received a 64-bit DSN */
ec3edaa7 236 spinlock_t join_list_lock;
ea4ca586 237 struct sock *ack_hint;
80992017 238 struct work_struct work;
ab174ad8
PA		 239 struct sk_buff *ooo_last_skb;
240 struct rb_root out_of_order_queue;
cec37a6e 241 struct list_head conn_list;
18b683bf 242 struct list_head rtx_queue;
f0e6a4cf 243 struct mptcp_data_frag *first_pending;
ec3edaa7 244 struct list_head join_list;
6d0060f6 245 struct skb_ext *cached_ext; /* for the next sendmsg */
f870fa0b 246 struct socket *subflow; /* outgoing connect/listener/!mp_capable */
8ab183de 247 struct sock *first;
1b1c7a0e 248 struct mptcp_pm_data pm;
a6b118fe
FW		 249 struct {
250 u32 space; /* bytes copied in last measurement window */
251 u32 copied; /* bytes copied in this measurement window */
252 u64 time; /* start time of measurement window */
253 u64 rtt_us; /* last maximum rtt of subflows */
254 } rcvq_space;
f870fa0b
MM		 255};
256
ad80b0fc
PA		 257#define mptcp_lock_sock(___sk, cb) do { \
258 struct sock *__sk = (___sk); /* silence macro reuse warning */ \
259 might_sleep(); \
260 spin_lock_bh(&__sk->sk_lock.slock); \
261 if (__sk->sk_lock.owned) \
262 __lock_sock(__sk); \
263 cb; \
264 __sk->sk_lock.owned = 1; \
265 spin_unlock(&__sk->sk_lock.slock); \
266 mutex_acquire(&__sk->sk_lock.dep_map, 0, 0, _RET_IP_); \
267 local_bh_enable(); \
268} while (0)
269
cec37a6e
PK		 270#define mptcp_for_each_subflow(__msk, __subflow) \
271 list_for_each_entry(__subflow, &((__msk)->conn_list), node)
272
f870fa0b
MM		 273static inline struct mptcp_sock *mptcp_sk(const struct sock *sk)
274{
275 return (struct mptcp_sock *)sk;
276}
277
ea4ca586
PA		 278static inline int __mptcp_space(const struct sock *sk)
279{
280 return tcp_space(sk) + READ_ONCE(mptcp_sk(sk)->rmem_pending);
281}
282
f0e6a4cf
PA		 283static inline struct mptcp_data_frag *mptcp_send_head(const struct sock *sk)
284{
285 const struct mptcp_sock *msk = mptcp_sk(sk);
286
287 return READ_ONCE(msk->first_pending);
288}
289
290static inline struct mptcp_data_frag *mptcp_send_next(struct sock *sk)
291{
292 struct mptcp_sock *msk = mptcp_sk(sk);
293 struct mptcp_data_frag *cur;
294
295 cur = msk->first_pending;
296 return list_is_last(&cur->list, &msk->rtx_queue) ? NULL :
297 list_next_entry(cur, list);
298}
299
300static inline struct mptcp_data_frag *mptcp_pending_tail(const struct sock *sk)
301{
302 struct mptcp_sock *msk = mptcp_sk(sk);
303
304 if (!msk->first_pending)
305 return NULL;
306
307 if (WARN_ON_ONCE(list_empty(&msk->rtx_queue)))
308 return NULL;
309
310 return list_last_entry(&msk->rtx_queue, struct mptcp_data_frag, list);
311}
312
18b683bf
PA		 313static inline struct mptcp_data_frag *mptcp_rtx_tail(const struct sock *sk)
314{
315 struct mptcp_sock *msk = mptcp_sk(sk);
316
eaa2ffab 317 if (!before64(msk->snd_nxt, atomic64_read(&msk->snd_una)))
18b683bf
PA		 318 return NULL;
319
320 return list_last_entry(&msk->rtx_queue, struct mptcp_data_frag, list);
321}
322
7948f6cc
FW		 323static inline struct mptcp_data_frag *mptcp_rtx_head(const struct sock *sk)
324{
325 struct mptcp_sock *msk = mptcp_sk(sk);
326
a386bc5b 327 return list_first_entry_or_null(&msk->rtx_queue, struct mptcp_data_frag, list);
7948f6cc
FW		 328}
329
cec37a6e
PK		 330struct mptcp_subflow_request_sock {
331 struct tcp_request_sock sk;
d22f4988 332 u16 mp_capable : 1,
cec37a6e 333 mp_join : 1,
fca5c82c 334 backup : 1;
1b1c7a0e 335 u8 local_id;
f296234c 336 u8 remote_id;
cec37a6e 337 u64 local_key;
79c0949e
PK		 338 u64 idsn;
339 u32 token;
648ef4b8 340 u32 ssn_offset;
f296234c
PK		 341 u64 thmac;
342 u32 local_nonce;
343 u32 remote_nonce;
8fd4de12 344 struct mptcp_sock *msk;
2c5ebd00 345 struct hlist_nulls_node token_node;
cec37a6e
PK		 346};
347
348static inline struct mptcp_subflow_request_sock *
349mptcp_subflow_rsk(const struct request_sock *rsk)
350{
351 return (struct mptcp_subflow_request_sock *)rsk;
352}
353
6719331c
PA		 354enum mptcp_data_avail {
355 MPTCP_SUBFLOW_NODATA,
356 MPTCP_SUBFLOW_DATA_AVAIL,
357 MPTCP_SUBFLOW_OOO_DATA
358};
359
2303f994
PK		 360/* MPTCP subflow context */
361struct mptcp_subflow_context {
cec37a6e
PK		 362 struct list_head node;/* conn_list of subflows */
363 u64 local_key;
364 u64 remote_key;
79c0949e 365 u64 idsn;
648ef4b8 366 u64 map_seq;
cc7972ea 367 u32 snd_isn;
79c0949e 368 u32 token;
6d0060f6 369 u32 rel_write_seq;
648ef4b8
MM		 370 u32 map_subflow_seq;
371 u32 ssn_offset;
372 u32 map_data_len;
cec37a6e 373 u32 request_mptcp : 1, /* send MP_CAPABLE */
ec3edaa7
PK		 374 request_join : 1, /* send MP_JOIN */
375 request_bkup : 1,
cec37a6e 376 mp_capable : 1, /* remote is MPTCP capable */
f296234c 377 mp_join : 1, /* remote is JOINing */
0be534f5 378 fully_established : 1, /* path validated */
f296234c 379 pm_notified : 1, /* PM hook called for established status */
648ef4b8
MM		 380 conn_finished : 1,
381 map_valid : 1,
d22f4988 382 mpc_map : 1,
f296234c 383 backup : 1,
d22f4988 384 rx_eof : 1,
e16163b6
PA		 385 can_ack : 1, /* only after processing the remote a key */
386 disposable : 1; /* ctx can be free at ulp release time */
6719331c 387 enum mptcp_data_avail data_avail;
f296234c
PK		 388 u32 remote_nonce;
389 u64 thmac;
390 u32 local_nonce;
ec3edaa7
PK		 391 u32 remote_token;
392 u8 hmac[MPTCPOPT_HMAC_LEN];
f296234c
PK		 393 u8 local_id;
394 u8 remote_id;
648ef4b8 395
2303f994
PK		 396 struct sock *tcp_sock; /* tcp sk backpointer */
397 struct sock *conn; /* parent mptcp_sock */
cec37a6e 398 const struct inet_connection_sock_af_ops *icsk_af_ops;
648ef4b8
MM		 399 void (*tcp_data_ready)(struct sock *sk);
400 void (*tcp_state_change)(struct sock *sk);
401 void (*tcp_write_space)(struct sock *sk);
402
2303f994
PK		 403 struct rcu_head rcu;
404};
405
406static inline struct mptcp_subflow_context *
407mptcp_subflow_ctx(const struct sock *sk)
408{
409 struct inet_connection_sock *icsk = inet_csk(sk);
410
411 /* Use RCU on icsk_ulp_data only for sock diag code */
412 return (__force struct mptcp_subflow_context *)icsk->icsk_ulp_data;
413}
414
415static inline struct sock *
416mptcp_subflow_tcp_sock(const struct mptcp_subflow_context *subflow)
417{
418 return subflow->tcp_sock;
419}
420
648ef4b8
MM		 421static inline u64
422mptcp_subflow_get_map_offset(const struct mptcp_subflow_context *subflow)
423{
424 return tcp_sk(mptcp_subflow_tcp_sock(subflow))->copied_seq -
425 subflow->ssn_offset -
426 subflow->map_subflow_seq;
427}
428
429static inline u64
430mptcp_subflow_get_mapped_dsn(const struct mptcp_subflow_context *subflow)
431{
432 return subflow->map_seq + mptcp_subflow_get_map_offset(subflow);
433}
434
0397c6d8
PA		 435static inline void mptcp_add_pending_subflow(struct mptcp_sock *msk,
436 struct mptcp_subflow_context *subflow)
437{
438 sock_hold(mptcp_subflow_tcp_sock(subflow));
439 spin_lock_bh(&msk->join_list_lock);
440 list_add_tail(&subflow->node, &msk->join_list);
441 spin_unlock_bh(&msk->join_list_lock);
442}
443
648ef4b8 444int mptcp_is_enabled(struct net *net);
93f323b9 445unsigned int mptcp_get_add_addr_timeout(struct net *net);
b93df08c
PA		 446void mptcp_subflow_fully_established(struct mptcp_subflow_context *subflow,
447 struct mptcp_options_received *mp_opt);
648ef4b8 448bool mptcp_subflow_data_available(struct sock *sk);
d39dceca 449void __init mptcp_subflow_init(void);
d0876b22
GT		 450void mptcp_subflow_shutdown(struct sock *sk, struct sock *ssk, int how);
451void __mptcp_close_ssk(struct sock *sk, struct sock *ssk,
e16163b6 452 struct mptcp_subflow_context *subflow);
d5824847 453void mptcp_subflow_reset(struct sock *ssk);
ec3edaa7
PK		 454
455/* called with sk socket lock held */
ef0da3b8 456int __mptcp_subflow_connect(struct sock *sk, const struct mptcp_addr_info *loc,
ec3edaa7 457 const struct mptcp_addr_info *remote);
2303f994
PK		 458int mptcp_subflow_create_socket(struct sock *sk, struct socket **new_sock);
459
648ef4b8
MM		 460static inline void mptcp_subflow_tcp_fallback(struct sock *sk,
461 struct mptcp_subflow_context *ctx)
462{
463 sk->sk_data_ready = ctx->tcp_data_ready;
464 sk->sk_state_change = ctx->tcp_state_change;
465 sk->sk_write_space = ctx->tcp_write_space;
466
467 inet_csk(sk)->icsk_af_ops = ctx->icsk_af_ops;
468}
469
d39dceca 470void __init mptcp_proto_init(void);
784325e9 471#if IS_ENABLED(CONFIG_MPTCP_IPV6)
d39dceca 472int __init mptcp_proto_v6_init(void);
784325e9 473#endif
648ef4b8 474
fca5c82c 475struct sock *mptcp_sk_clone(const struct sock *sk,
cfde141e 476 const struct mptcp_options_received *mp_opt,
fca5c82c 477 struct request_sock *req);
cec37a6e 478void mptcp_get_options(const struct sk_buff *skb,
cfde141e 479 struct mptcp_options_received *mp_opt);
cec37a6e
PK		 480
481void mptcp_finish_connect(struct sock *sk);
b93df08c
PA		 482static inline bool mptcp_is_fully_established(struct sock *sk)
483{
484 return inet_sk_state_load(sk) == TCP_ESTABLISHED &&
485 READ_ONCE(mptcp_sk(sk)->fully_established);
486}
a6b118fe 487void mptcp_rcv_space_init(struct mptcp_sock *msk, const struct sock *ssk);
2e52213c 488void mptcp_data_ready(struct sock *sk, struct sock *ssk);
f296234c 489bool mptcp_finish_join(struct sock *sk);
ba8f48f7 490bool mptcp_schedule_work(struct sock *sk);
b51f9b80 491void mptcp_data_acked(struct sock *sk);
59832e24 492void mptcp_subflow_eof(struct sock *sk);
1a49b2c2 493bool mptcp_update_rcv_data_fin(struct mptcp_sock *msk, u64 data_fin_seq, bool use_64bit);
84dfe367 494void __mptcp_flush_join_list(struct mptcp_sock *msk);
e16163b6
PA		 495static inline bool mptcp_data_fin_enabled(const struct mptcp_sock *msk)
496{
497 return READ_ONCE(msk->snd_data_fin_enable) &&
498 READ_ONCE(msk->write_seq) == READ_ONCE(msk->snd_nxt);
499}
500
5c8c1640 501void mptcp_destroy_common(struct mptcp_sock *msk);
cec37a6e 502
2c5ebd00
PA		 503void __init mptcp_token_init(void);
504static inline void mptcp_token_init_request(struct request_sock *req)
505{
506 mptcp_subflow_rsk(req)->token_node.pprev = NULL;
507}
508
79c0949e 509int mptcp_token_new_request(struct request_sock *req);
2c5ebd00 510void mptcp_token_destroy_request(struct request_sock *req);
79c0949e 511int mptcp_token_new_connect(struct sock *sk);
2c5ebd00
PA		 512void mptcp_token_accept(struct mptcp_subflow_request_sock *r,
513 struct mptcp_sock *msk);
c83a47e5 514bool mptcp_token_exists(u32 token);
f296234c 515struct mptcp_sock *mptcp_token_get_sock(u32 token);
96d890da
PA		 516struct mptcp_sock *mptcp_token_iter_next(const struct net *net, long *s_slot,
517 long *s_num);
2c5ebd00 518void mptcp_token_destroy(struct mptcp_sock *msk);
79c0949e
PK		 519
520void mptcp_crypto_key_sha(u64 key, u32 *token, u64 *idsn);
79c0949e 521
3df523ab 522void mptcp_crypto_hmac_sha(u64 key1, u64 key2, u8 *msg, int len, void *hmac);
79c0949e 523
d39dceca 524void __init mptcp_pm_init(void);
1b1c7a0e
PK		 525void mptcp_pm_data_init(struct mptcp_sock *msk);
526void mptcp_pm_new_connection(struct mptcp_sock *msk, int server_side);
527void mptcp_pm_fully_established(struct mptcp_sock *msk);
528bool mptcp_pm_allow_new_subflow(struct mptcp_sock *msk);
529void mptcp_pm_connection_closed(struct mptcp_sock *msk);
530void mptcp_pm_subflow_established(struct mptcp_sock *msk,
531 struct mptcp_subflow_context *subflow);
532void mptcp_pm_subflow_closed(struct mptcp_sock *msk, u8 id);
533void mptcp_pm_add_addr_received(struct mptcp_sock *msk,
534 const struct mptcp_addr_info *addr);
84dfe367 535void mptcp_pm_add_addr_send_ack(struct mptcp_sock *msk);
d0876b22 536void mptcp_pm_rm_addr_received(struct mptcp_sock *msk, u8 rm_id);
b6c08380 537void mptcp_pm_free_anno_list(struct mptcp_sock *msk);
00cfd77b
GT		 538struct mptcp_pm_add_entry *
539mptcp_pm_del_add_timer(struct mptcp_sock *msk,
540 struct mptcp_addr_info *addr);
1b1c7a0e
PK		 541
542int mptcp_pm_announce_addr(struct mptcp_sock *msk,
6a6c05a8
GT		 543 const struct mptcp_addr_info *addr,
544 bool echo);
1b1c7a0e 545int mptcp_pm_remove_addr(struct mptcp_sock *msk, u8 local_id);
0ee4261a 546int mptcp_pm_remove_subflow(struct mptcp_sock *msk, u8 local_id);
1b1c7a0e 547
f643b803 548static inline bool mptcp_pm_should_add_signal(struct mptcp_sock *msk)
1b1c7a0e 549{
d91d322a
GT		 550 return READ_ONCE(msk->pm.add_addr_signal) & BIT(MPTCP_ADD_ADDR_SIGNAL);
551}
552
553static inline bool mptcp_pm_should_add_signal_echo(struct mptcp_sock *msk)
554{
555 return READ_ONCE(msk->pm.add_addr_signal) & BIT(MPTCP_ADD_ADDR_ECHO);
1b1c7a0e
PK		 556}
557
84dfe367
GT		 558static inline bool mptcp_pm_should_add_signal_ipv6(struct mptcp_sock *msk)
559{
560 return READ_ONCE(msk->pm.add_addr_signal) & BIT(MPTCP_ADD_ADDR_IPV6);
561}
562
5cb104ae
GT		 563static inline bool mptcp_pm_should_rm_signal(struct mptcp_sock *msk)
564{
565 return READ_ONCE(msk->pm.rm_addr_signal);
566}
567
456afe01 568static inline unsigned int mptcp_add_addr_len(int family, bool echo)
1b1c7a0e
PK		 569{
570 if (family == AF_INET)
456afe01
MB		 571 return echo ? TCPOLEN_MPTCP_ADD_ADDR_BASE
572 : TCPOLEN_MPTCP_ADD_ADDR;
573 return echo ? TCPOLEN_MPTCP_ADD_ADDR6_BASE : TCPOLEN_MPTCP_ADD_ADDR6;
1b1c7a0e
PK		 574}
575
f643b803 576bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, unsigned int remaining,
6a6c05a8 577 struct mptcp_addr_info *saddr, bool *echo);
5cb104ae
GT		 578bool mptcp_pm_rm_addr_signal(struct mptcp_sock *msk, unsigned int remaining,
579 u8 *rm_id);
1b1c7a0e
PK		 580int mptcp_pm_get_local_id(struct mptcp_sock *msk, struct sock_common *skc);
581
d39dceca 582void __init mptcp_pm_nl_init(void);
01cacb00
PA		 583void mptcp_pm_nl_data_init(struct mptcp_sock *msk);
584void mptcp_pm_nl_fully_established(struct mptcp_sock *msk);
585void mptcp_pm_nl_subflow_established(struct mptcp_sock *msk);
586void mptcp_pm_nl_add_addr_received(struct mptcp_sock *msk);
84dfe367 587void mptcp_pm_nl_add_addr_send_ack(struct mptcp_sock *msk);
d0876b22 588void mptcp_pm_nl_rm_addr_received(struct mptcp_sock *msk);
0ee4261a 589void mptcp_pm_nl_rm_subflow_received(struct mptcp_sock *msk, u8 rm_id);
01cacb00
PA		 590int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, struct sock_common *skc);
591
6d0060f6
MM		 592static inline struct mptcp_ext *mptcp_get_ext(struct sk_buff *skb)
593{
594 return (struct mptcp_ext *)skb_ext_find(skb, SKB_EXT_MPTCP);
595}
596
5147dfb5
DC		 597void mptcp_diag_subflow_init(struct tcp_ulp_ops *ops);
598
d5f49190 599static inline bool __mptcp_check_fallback(const struct mptcp_sock *msk)
e1ff9e82
DC		 600{
601 return test_bit(MPTCP_FALLBACK_DONE, &msk->flags);
602}
603
d5f49190 604static inline bool mptcp_check_fallback(const struct sock *sk)
e1ff9e82
DC		 605{
606 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
607 struct mptcp_sock *msk = mptcp_sk(subflow->conn);
608
609 return __mptcp_check_fallback(msk);
610}
611
612static inline void __mptcp_do_fallback(struct mptcp_sock *msk)
613{
614 if (test_bit(MPTCP_FALLBACK_DONE, &msk->flags)) {
615 pr_debug("TCP fallback already done (msk=%p)", msk);
616 return;
617 }
618 set_bit(MPTCP_FALLBACK_DONE, &msk->flags);
619}
620
621static inline void mptcp_do_fallback(struct sock *sk)
622{
623 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
624 struct mptcp_sock *msk = mptcp_sk(subflow->conn);
625
626 __mptcp_do_fallback(msk);
627}
628
629#define pr_fallback(a) pr_debug("%s:fallback to TCP (msk=%p)", __func__, a)
630
8fd73804
DC		 631static inline bool subflow_simultaneous_connect(struct sock *sk)
632{
633 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
634 struct sock *parent = subflow->conn;
635
636 return sk->sk_state == TCP_ESTABLISHED &&
637 !mptcp_sk(parent)->pm.server_side &&
638 !subflow->conn_finished;
639}
640
9466a1cc
FW		 641#ifdef CONFIG_SYN_COOKIES
642void subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req,
643 struct sk_buff *skb);
644bool mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req,
645 struct sk_buff *skb);
646void __init mptcp_join_cookie_init(void);
647#else
648static inline void
649subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req,
650 struct sk_buff *skb) {}
651static inline bool
652mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req,
653 struct sk_buff *skb)
654{
655 return false;
656}
657
658static inline void mptcp_join_cookie_init(void) {}
659#endif
660
f870fa0b 661#endif /* __MPTCP_PROTOCOL_H */
Linux 6.x block layer and io_uring tree(s)