Commit | Line | Data |
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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 FW |
88 | #define MPTCP_DATA_READY 0 |
89 | #define MPTCP_SEND_SPACE 1 | |
3b1d6210 | 90 | #define MPTCP_WORK_RTX 2 |
59832e24 | 91 | #define MPTCP_WORK_EOF 3 |
e1ff9e82 | 92 | #define MPTCP_FALLBACK_DONE 4 |
6d0060f6 | 93 | |
cfde141e PA |
94 | struct mptcp_options_received { |
95 | u64 sndr_key; | |
96 | u64 rcvr_key; | |
97 | u64 data_ack; | |
98 | u64 data_seq; | |
99 | u32 subflow_seq; | |
100 | u16 data_len; | |
101 | u16 mp_capable : 1, | |
102 | mp_join : 1, | |
103 | dss : 1, | |
104 | add_addr : 1, | |
105 | rm_addr : 1, | |
106 | family : 4, | |
107 | echo : 1, | |
108 | backup : 1; | |
109 | u32 token; | |
110 | u32 nonce; | |
111 | u64 thmac; | |
112 | u8 hmac[20]; | |
113 | u8 join_id; | |
114 | u8 use_map:1, | |
115 | dsn64:1, | |
116 | data_fin:1, | |
117 | use_ack:1, | |
118 | ack64:1, | |
119 | mpc_map:1, | |
120 | __unused:2; | |
121 | u8 addr_id; | |
122 | u8 rm_id; | |
123 | union { | |
124 | struct in_addr addr; | |
125 | #if IS_ENABLED(CONFIG_MPTCP_IPV6) | |
126 | struct in6_addr addr6; | |
127 | #endif | |
128 | }; | |
129 | u64 ahmac; | |
130 | u16 port; | |
131 | }; | |
132 | ||
3df523ab PK |
133 | static inline __be32 mptcp_option(u8 subopt, u8 len, u8 nib, u8 field) |
134 | { | |
135 | return htonl((TCPOPT_MPTCP << 24) | (len << 16) | (subopt << 12) | | |
136 | ((nib & 0xF) << 8) | field); | |
137 | } | |
138 | ||
1b1c7a0e PK |
139 | struct mptcp_addr_info { |
140 | sa_family_t family; | |
141 | __be16 port; | |
142 | u8 id; | |
143 | union { | |
144 | struct in_addr addr; | |
145 | #if IS_ENABLED(CONFIG_MPTCP_IPV6) | |
146 | struct in6_addr addr6; | |
147 | #endif | |
148 | }; | |
149 | }; | |
150 | ||
151 | enum mptcp_pm_status { | |
152 | MPTCP_PM_ADD_ADDR_RECEIVED, | |
153 | MPTCP_PM_ESTABLISHED, | |
154 | MPTCP_PM_SUBFLOW_ESTABLISHED, | |
155 | }; | |
156 | ||
157 | struct mptcp_pm_data { | |
158 | struct mptcp_addr_info local; | |
159 | struct mptcp_addr_info remote; | |
160 | ||
161 | spinlock_t lock; /*protects the whole PM data */ | |
162 | ||
163 | bool addr_signal; | |
164 | bool server_side; | |
165 | bool work_pending; | |
166 | bool accept_addr; | |
167 | bool accept_subflow; | |
168 | u8 add_addr_signaled; | |
169 | u8 add_addr_accepted; | |
170 | u8 local_addr_used; | |
171 | u8 subflows; | |
172 | u8 add_addr_signal_max; | |
173 | u8 add_addr_accept_max; | |
174 | u8 local_addr_max; | |
175 | u8 subflows_max; | |
176 | u8 status; | |
1b1c7a0e PK |
177 | }; |
178 | ||
18b683bf PA |
179 | struct mptcp_data_frag { |
180 | struct list_head list; | |
181 | u64 data_seq; | |
182 | int data_len; | |
183 | int offset; | |
184 | int overhead; | |
185 | struct page *page; | |
186 | }; | |
187 | ||
f870fa0b MM |
188 | /* MPTCP connection sock */ |
189 | struct mptcp_sock { | |
190 | /* inet_connection_sock must be the first member */ | |
191 | struct inet_connection_sock sk; | |
cec37a6e PK |
192 | u64 local_key; |
193 | u64 remote_key; | |
6d0060f6 MM |
194 | u64 write_seq; |
195 | u64 ack_seq; | |
3721b9b6 | 196 | u64 rcv_data_fin_seq; |
cc9d2566 | 197 | atomic64_t snd_una; |
b51f9b80 | 198 | unsigned long timer_ival; |
79c0949e | 199 | u32 token; |
648ef4b8 | 200 | unsigned long flags; |
d22f4988 | 201 | bool can_ack; |
b93df08c | 202 | bool fully_established; |
3721b9b6 | 203 | bool rcv_data_fin; |
7279da61 | 204 | bool snd_data_fin_enable; |
ec3edaa7 | 205 | spinlock_t join_list_lock; |
80992017 | 206 | struct work_struct work; |
ab174ad8 PA |
207 | struct sk_buff *ooo_last_skb; |
208 | struct rb_root out_of_order_queue; | |
cec37a6e | 209 | struct list_head conn_list; |
18b683bf | 210 | struct list_head rtx_queue; |
ec3edaa7 | 211 | struct list_head join_list; |
6d0060f6 | 212 | struct skb_ext *cached_ext; /* for the next sendmsg */ |
f870fa0b | 213 | struct socket *subflow; /* outgoing connect/listener/!mp_capable */ |
8ab183de | 214 | struct sock *first; |
1b1c7a0e | 215 | struct mptcp_pm_data pm; |
a6b118fe FW |
216 | struct { |
217 | u32 space; /* bytes copied in last measurement window */ | |
218 | u32 copied; /* bytes copied in this measurement window */ | |
219 | u64 time; /* start time of measurement window */ | |
220 | u64 rtt_us; /* last maximum rtt of subflows */ | |
221 | } rcvq_space; | |
f870fa0b MM |
222 | }; |
223 | ||
cec37a6e PK |
224 | #define mptcp_for_each_subflow(__msk, __subflow) \ |
225 | list_for_each_entry(__subflow, &((__msk)->conn_list), node) | |
226 | ||
f870fa0b MM |
227 | static inline struct mptcp_sock *mptcp_sk(const struct sock *sk) |
228 | { | |
229 | return (struct mptcp_sock *)sk; | |
230 | } | |
231 | ||
18b683bf PA |
232 | static inline struct mptcp_data_frag *mptcp_rtx_tail(const struct sock *sk) |
233 | { | |
234 | struct mptcp_sock *msk = mptcp_sk(sk); | |
235 | ||
236 | if (list_empty(&msk->rtx_queue)) | |
237 | return NULL; | |
238 | ||
239 | return list_last_entry(&msk->rtx_queue, struct mptcp_data_frag, list); | |
240 | } | |
241 | ||
7948f6cc FW |
242 | static inline struct mptcp_data_frag *mptcp_rtx_head(const struct sock *sk) |
243 | { | |
244 | struct mptcp_sock *msk = mptcp_sk(sk); | |
245 | ||
a386bc5b | 246 | return list_first_entry_or_null(&msk->rtx_queue, struct mptcp_data_frag, list); |
7948f6cc FW |
247 | } |
248 | ||
cec37a6e PK |
249 | struct mptcp_subflow_request_sock { |
250 | struct tcp_request_sock sk; | |
d22f4988 | 251 | u16 mp_capable : 1, |
cec37a6e | 252 | mp_join : 1, |
fca5c82c | 253 | backup : 1; |
1b1c7a0e | 254 | u8 local_id; |
f296234c | 255 | u8 remote_id; |
cec37a6e | 256 | u64 local_key; |
79c0949e PK |
257 | u64 idsn; |
258 | u32 token; | |
648ef4b8 | 259 | u32 ssn_offset; |
f296234c PK |
260 | u64 thmac; |
261 | u32 local_nonce; | |
262 | u32 remote_nonce; | |
8fd4de12 | 263 | struct mptcp_sock *msk; |
2c5ebd00 | 264 | struct hlist_nulls_node token_node; |
cec37a6e PK |
265 | }; |
266 | ||
267 | static inline struct mptcp_subflow_request_sock * | |
268 | mptcp_subflow_rsk(const struct request_sock *rsk) | |
269 | { | |
270 | return (struct mptcp_subflow_request_sock *)rsk; | |
271 | } | |
272 | ||
6719331c PA |
273 | enum mptcp_data_avail { |
274 | MPTCP_SUBFLOW_NODATA, | |
275 | MPTCP_SUBFLOW_DATA_AVAIL, | |
276 | MPTCP_SUBFLOW_OOO_DATA | |
277 | }; | |
278 | ||
2303f994 PK |
279 | /* MPTCP subflow context */ |
280 | struct mptcp_subflow_context { | |
cec37a6e PK |
281 | struct list_head node;/* conn_list of subflows */ |
282 | u64 local_key; | |
283 | u64 remote_key; | |
79c0949e | 284 | u64 idsn; |
648ef4b8 | 285 | u64 map_seq; |
cc7972ea | 286 | u32 snd_isn; |
79c0949e | 287 | u32 token; |
6d0060f6 | 288 | u32 rel_write_seq; |
648ef4b8 MM |
289 | u32 map_subflow_seq; |
290 | u32 ssn_offset; | |
291 | u32 map_data_len; | |
cec37a6e | 292 | u32 request_mptcp : 1, /* send MP_CAPABLE */ |
ec3edaa7 PK |
293 | request_join : 1, /* send MP_JOIN */ |
294 | request_bkup : 1, | |
cec37a6e | 295 | mp_capable : 1, /* remote is MPTCP capable */ |
f296234c | 296 | mp_join : 1, /* remote is JOINing */ |
0be534f5 | 297 | fully_established : 1, /* path validated */ |
f296234c | 298 | pm_notified : 1, /* PM hook called for established status */ |
648ef4b8 MM |
299 | conn_finished : 1, |
300 | map_valid : 1, | |
d22f4988 | 301 | mpc_map : 1, |
f296234c | 302 | backup : 1, |
d22f4988 | 303 | rx_eof : 1, |
a0c1d0ea | 304 | use_64bit_ack : 1, /* Set when we received a 64-bit DSN */ |
d22f4988 | 305 | can_ack : 1; /* only after processing the remote a key */ |
6719331c | 306 | enum mptcp_data_avail data_avail; |
f296234c PK |
307 | u32 remote_nonce; |
308 | u64 thmac; | |
309 | u32 local_nonce; | |
ec3edaa7 PK |
310 | u32 remote_token; |
311 | u8 hmac[MPTCPOPT_HMAC_LEN]; | |
f296234c PK |
312 | u8 local_id; |
313 | u8 remote_id; | |
648ef4b8 | 314 | |
2303f994 PK |
315 | struct sock *tcp_sock; /* tcp sk backpointer */ |
316 | struct sock *conn; /* parent mptcp_sock */ | |
cec37a6e | 317 | const struct inet_connection_sock_af_ops *icsk_af_ops; |
648ef4b8 MM |
318 | void (*tcp_data_ready)(struct sock *sk); |
319 | void (*tcp_state_change)(struct sock *sk); | |
320 | void (*tcp_write_space)(struct sock *sk); | |
321 | ||
2303f994 PK |
322 | struct rcu_head rcu; |
323 | }; | |
324 | ||
325 | static inline struct mptcp_subflow_context * | |
326 | mptcp_subflow_ctx(const struct sock *sk) | |
327 | { | |
328 | struct inet_connection_sock *icsk = inet_csk(sk); | |
329 | ||
330 | /* Use RCU on icsk_ulp_data only for sock diag code */ | |
331 | return (__force struct mptcp_subflow_context *)icsk->icsk_ulp_data; | |
332 | } | |
333 | ||
334 | static inline struct sock * | |
335 | mptcp_subflow_tcp_sock(const struct mptcp_subflow_context *subflow) | |
336 | { | |
337 | return subflow->tcp_sock; | |
338 | } | |
339 | ||
648ef4b8 MM |
340 | static inline u64 |
341 | mptcp_subflow_get_map_offset(const struct mptcp_subflow_context *subflow) | |
342 | { | |
343 | return tcp_sk(mptcp_subflow_tcp_sock(subflow))->copied_seq - | |
344 | subflow->ssn_offset - | |
345 | subflow->map_subflow_seq; | |
346 | } | |
347 | ||
348 | static inline u64 | |
349 | mptcp_subflow_get_mapped_dsn(const struct mptcp_subflow_context *subflow) | |
350 | { | |
351 | return subflow->map_seq + mptcp_subflow_get_map_offset(subflow); | |
352 | } | |
353 | ||
354 | int mptcp_is_enabled(struct net *net); | |
b93df08c PA |
355 | void mptcp_subflow_fully_established(struct mptcp_subflow_context *subflow, |
356 | struct mptcp_options_received *mp_opt); | |
648ef4b8 | 357 | bool mptcp_subflow_data_available(struct sock *sk); |
d39dceca | 358 | void __init mptcp_subflow_init(void); |
ec3edaa7 PK |
359 | |
360 | /* called with sk socket lock held */ | |
361 | int __mptcp_subflow_connect(struct sock *sk, int ifindex, | |
362 | const struct mptcp_addr_info *loc, | |
363 | const struct mptcp_addr_info *remote); | |
2303f994 PK |
364 | int mptcp_subflow_create_socket(struct sock *sk, struct socket **new_sock); |
365 | ||
648ef4b8 MM |
366 | static inline void mptcp_subflow_tcp_fallback(struct sock *sk, |
367 | struct mptcp_subflow_context *ctx) | |
368 | { | |
369 | sk->sk_data_ready = ctx->tcp_data_ready; | |
370 | sk->sk_state_change = ctx->tcp_state_change; | |
371 | sk->sk_write_space = ctx->tcp_write_space; | |
372 | ||
373 | inet_csk(sk)->icsk_af_ops = ctx->icsk_af_ops; | |
374 | } | |
375 | ||
d39dceca | 376 | void __init mptcp_proto_init(void); |
784325e9 | 377 | #if IS_ENABLED(CONFIG_MPTCP_IPV6) |
d39dceca | 378 | int __init mptcp_proto_v6_init(void); |
784325e9 | 379 | #endif |
648ef4b8 | 380 | |
fca5c82c | 381 | struct sock *mptcp_sk_clone(const struct sock *sk, |
cfde141e | 382 | const struct mptcp_options_received *mp_opt, |
fca5c82c | 383 | struct request_sock *req); |
cec37a6e | 384 | void mptcp_get_options(const struct sk_buff *skb, |
cfde141e | 385 | struct mptcp_options_received *mp_opt); |
cec37a6e PK |
386 | |
387 | void mptcp_finish_connect(struct sock *sk); | |
b93df08c PA |
388 | static inline bool mptcp_is_fully_established(struct sock *sk) |
389 | { | |
390 | return inet_sk_state_load(sk) == TCP_ESTABLISHED && | |
391 | READ_ONCE(mptcp_sk(sk)->fully_established); | |
392 | } | |
a6b118fe | 393 | void mptcp_rcv_space_init(struct mptcp_sock *msk, const struct sock *ssk); |
2e52213c | 394 | void mptcp_data_ready(struct sock *sk, struct sock *ssk); |
f296234c | 395 | bool mptcp_finish_join(struct sock *sk); |
b51f9b80 | 396 | void mptcp_data_acked(struct sock *sk); |
59832e24 | 397 | void mptcp_subflow_eof(struct sock *sk); |
3721b9b6 | 398 | bool mptcp_update_rcv_data_fin(struct mptcp_sock *msk, u64 data_fin_seq); |
cec37a6e | 399 | |
2c5ebd00 PA |
400 | void __init mptcp_token_init(void); |
401 | static inline void mptcp_token_init_request(struct request_sock *req) | |
402 | { | |
403 | mptcp_subflow_rsk(req)->token_node.pprev = NULL; | |
404 | } | |
405 | ||
79c0949e | 406 | int mptcp_token_new_request(struct request_sock *req); |
2c5ebd00 | 407 | void mptcp_token_destroy_request(struct request_sock *req); |
79c0949e | 408 | int mptcp_token_new_connect(struct sock *sk); |
2c5ebd00 PA |
409 | void mptcp_token_accept(struct mptcp_subflow_request_sock *r, |
410 | struct mptcp_sock *msk); | |
c83a47e5 | 411 | bool mptcp_token_exists(u32 token); |
f296234c | 412 | struct mptcp_sock *mptcp_token_get_sock(u32 token); |
96d890da PA |
413 | struct mptcp_sock *mptcp_token_iter_next(const struct net *net, long *s_slot, |
414 | long *s_num); | |
2c5ebd00 | 415 | void mptcp_token_destroy(struct mptcp_sock *msk); |
79c0949e PK |
416 | |
417 | void mptcp_crypto_key_sha(u64 key, u32 *token, u64 *idsn); | |
79c0949e | 418 | |
3df523ab | 419 | void mptcp_crypto_hmac_sha(u64 key1, u64 key2, u8 *msg, int len, void *hmac); |
79c0949e | 420 | |
d39dceca | 421 | void __init mptcp_pm_init(void); |
1b1c7a0e PK |
422 | void mptcp_pm_data_init(struct mptcp_sock *msk); |
423 | void mptcp_pm_new_connection(struct mptcp_sock *msk, int server_side); | |
424 | void mptcp_pm_fully_established(struct mptcp_sock *msk); | |
425 | bool mptcp_pm_allow_new_subflow(struct mptcp_sock *msk); | |
426 | void mptcp_pm_connection_closed(struct mptcp_sock *msk); | |
427 | void mptcp_pm_subflow_established(struct mptcp_sock *msk, | |
428 | struct mptcp_subflow_context *subflow); | |
429 | void mptcp_pm_subflow_closed(struct mptcp_sock *msk, u8 id); | |
430 | void mptcp_pm_add_addr_received(struct mptcp_sock *msk, | |
431 | const struct mptcp_addr_info *addr); | |
432 | ||
433 | int mptcp_pm_announce_addr(struct mptcp_sock *msk, | |
434 | const struct mptcp_addr_info *addr); | |
435 | int mptcp_pm_remove_addr(struct mptcp_sock *msk, u8 local_id); | |
436 | int mptcp_pm_remove_subflow(struct mptcp_sock *msk, u8 remote_id); | |
437 | ||
438 | static inline bool mptcp_pm_should_signal(struct mptcp_sock *msk) | |
439 | { | |
440 | return READ_ONCE(msk->pm.addr_signal); | |
441 | } | |
442 | ||
443 | static inline unsigned int mptcp_add_addr_len(int family) | |
444 | { | |
445 | if (family == AF_INET) | |
446 | return TCPOLEN_MPTCP_ADD_ADDR; | |
447 | return TCPOLEN_MPTCP_ADD_ADDR6; | |
448 | } | |
449 | ||
450 | bool mptcp_pm_addr_signal(struct mptcp_sock *msk, unsigned int remaining, | |
451 | struct mptcp_addr_info *saddr); | |
452 | int mptcp_pm_get_local_id(struct mptcp_sock *msk, struct sock_common *skc); | |
453 | ||
d39dceca | 454 | void __init mptcp_pm_nl_init(void); |
01cacb00 PA |
455 | void mptcp_pm_nl_data_init(struct mptcp_sock *msk); |
456 | void mptcp_pm_nl_fully_established(struct mptcp_sock *msk); | |
457 | void mptcp_pm_nl_subflow_established(struct mptcp_sock *msk); | |
458 | void mptcp_pm_nl_add_addr_received(struct mptcp_sock *msk); | |
459 | int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, struct sock_common *skc); | |
460 | ||
6d0060f6 MM |
461 | static inline struct mptcp_ext *mptcp_get_ext(struct sk_buff *skb) |
462 | { | |
463 | return (struct mptcp_ext *)skb_ext_find(skb, SKB_EXT_MPTCP); | |
464 | } | |
465 | ||
648ef4b8 MM |
466 | static inline bool before64(__u64 seq1, __u64 seq2) |
467 | { | |
468 | return (__s64)(seq1 - seq2) < 0; | |
469 | } | |
470 | ||
471 | #define after64(seq2, seq1) before64(seq1, seq2) | |
472 | ||
5147dfb5 DC |
473 | void mptcp_diag_subflow_init(struct tcp_ulp_ops *ops); |
474 | ||
e1ff9e82 DC |
475 | static inline bool __mptcp_check_fallback(struct mptcp_sock *msk) |
476 | { | |
477 | return test_bit(MPTCP_FALLBACK_DONE, &msk->flags); | |
478 | } | |
479 | ||
480 | static inline bool mptcp_check_fallback(struct sock *sk) | |
481 | { | |
482 | struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); | |
483 | struct mptcp_sock *msk = mptcp_sk(subflow->conn); | |
484 | ||
485 | return __mptcp_check_fallback(msk); | |
486 | } | |
487 | ||
488 | static inline void __mptcp_do_fallback(struct mptcp_sock *msk) | |
489 | { | |
490 | if (test_bit(MPTCP_FALLBACK_DONE, &msk->flags)) { | |
491 | pr_debug("TCP fallback already done (msk=%p)", msk); | |
492 | return; | |
493 | } | |
494 | set_bit(MPTCP_FALLBACK_DONE, &msk->flags); | |
495 | } | |
496 | ||
497 | static inline void mptcp_do_fallback(struct sock *sk) | |
498 | { | |
499 | struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); | |
500 | struct mptcp_sock *msk = mptcp_sk(subflow->conn); | |
501 | ||
502 | __mptcp_do_fallback(msk); | |
503 | } | |
504 | ||
505 | #define pr_fallback(a) pr_debug("%s:fallback to TCP (msk=%p)", __func__, a) | |
506 | ||
8fd73804 DC |
507 | static inline bool subflow_simultaneous_connect(struct sock *sk) |
508 | { | |
509 | struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); | |
510 | struct sock *parent = subflow->conn; | |
511 | ||
512 | return sk->sk_state == TCP_ESTABLISHED && | |
513 | !mptcp_sk(parent)->pm.server_side && | |
514 | !subflow->conn_finished; | |
515 | } | |
516 | ||
9466a1cc FW |
517 | #ifdef CONFIG_SYN_COOKIES |
518 | void subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req, | |
519 | struct sk_buff *skb); | |
520 | bool mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req, | |
521 | struct sk_buff *skb); | |
522 | void __init mptcp_join_cookie_init(void); | |
523 | #else | |
524 | static inline void | |
525 | subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req, | |
526 | struct sk_buff *skb) {} | |
527 | static inline bool | |
528 | mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req, | |
529 | struct sk_buff *skb) | |
530 | { | |
531 | return false; | |
532 | } | |
533 | ||
534 | static inline void mptcp_join_cookie_init(void) {} | |
535 | #endif | |
536 | ||
f870fa0b | 537 | #endif /* __MPTCP_PROTOCOL_H */ |