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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 | #define pr_fmt(fmt) "MPTCP: " fmt | |
8 | ||
9 | #include <linux/kernel.h> | |
10 | #include <linux/module.h> | |
11 | #include <linux/netdevice.h> | |
12 | #include <net/sock.h> | |
13 | #include <net/inet_common.h> | |
14 | #include <net/inet_hashtables.h> | |
15 | #include <net/protocol.h> | |
16 | #include <net/tcp.h> | |
cf7da0d6 PK |
17 | #if IS_ENABLED(CONFIG_MPTCP_IPV6) |
18 | #include <net/transp_v6.h> | |
19 | #endif | |
f870fa0b MM |
20 | #include <net/mptcp.h> |
21 | #include "protocol.h" | |
22 | ||
2303f994 PK |
23 | #define MPTCP_SAME_STATE TCP_MAX_STATES |
24 | ||
25 | /* If msk has an initial subflow socket, and the MP_CAPABLE handshake has not | |
26 | * completed yet or has failed, return the subflow socket. | |
27 | * Otherwise return NULL. | |
28 | */ | |
29 | static struct socket *__mptcp_nmpc_socket(const struct mptcp_sock *msk) | |
30 | { | |
cec37a6e | 31 | if (!msk->subflow || mptcp_subflow_ctx(msk->subflow->sk)->fourth_ack) |
2303f994 PK |
32 | return NULL; |
33 | ||
34 | return msk->subflow; | |
35 | } | |
36 | ||
cec37a6e PK |
37 | /* if msk has a single subflow, and the mp_capable handshake is failed, |
38 | * return it. | |
39 | * Otherwise returns NULL | |
40 | */ | |
41 | static struct socket *__mptcp_tcp_fallback(const struct mptcp_sock *msk) | |
42 | { | |
43 | struct socket *ssock = __mptcp_nmpc_socket(msk); | |
44 | ||
45 | sock_owned_by_me((const struct sock *)msk); | |
46 | ||
47 | if (!ssock || sk_is_mptcp(ssock->sk)) | |
48 | return NULL; | |
49 | ||
50 | return ssock; | |
51 | } | |
52 | ||
2303f994 PK |
53 | static bool __mptcp_can_create_subflow(const struct mptcp_sock *msk) |
54 | { | |
55 | return ((struct sock *)msk)->sk_state == TCP_CLOSE; | |
56 | } | |
57 | ||
58 | static struct socket *__mptcp_socket_create(struct mptcp_sock *msk, int state) | |
59 | { | |
60 | struct mptcp_subflow_context *subflow; | |
61 | struct sock *sk = (struct sock *)msk; | |
62 | struct socket *ssock; | |
63 | int err; | |
64 | ||
65 | ssock = __mptcp_nmpc_socket(msk); | |
66 | if (ssock) | |
67 | goto set_state; | |
68 | ||
69 | if (!__mptcp_can_create_subflow(msk)) | |
70 | return ERR_PTR(-EINVAL); | |
71 | ||
72 | err = mptcp_subflow_create_socket(sk, &ssock); | |
73 | if (err) | |
74 | return ERR_PTR(err); | |
75 | ||
76 | msk->subflow = ssock; | |
77 | subflow = mptcp_subflow_ctx(ssock->sk); | |
cec37a6e | 78 | list_add(&subflow->node, &msk->conn_list); |
2303f994 PK |
79 | subflow->request_mptcp = 1; |
80 | ||
81 | set_state: | |
82 | if (state != MPTCP_SAME_STATE) | |
83 | inet_sk_state_store(sk, state); | |
84 | return ssock; | |
85 | } | |
86 | ||
cec37a6e PK |
87 | static struct sock *mptcp_subflow_get(const struct mptcp_sock *msk) |
88 | { | |
89 | struct mptcp_subflow_context *subflow; | |
90 | ||
91 | sock_owned_by_me((const struct sock *)msk); | |
92 | ||
93 | mptcp_for_each_subflow(msk, subflow) { | |
94 | return mptcp_subflow_tcp_sock(subflow); | |
95 | } | |
96 | ||
97 | return NULL; | |
98 | } | |
99 | ||
f870fa0b MM |
100 | static int mptcp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) |
101 | { | |
102 | struct mptcp_sock *msk = mptcp_sk(sk); | |
cec37a6e PK |
103 | struct socket *ssock; |
104 | struct sock *ssk; | |
105 | int ret; | |
f870fa0b MM |
106 | |
107 | if (msg->msg_flags & ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL)) | |
108 | return -EOPNOTSUPP; | |
109 | ||
cec37a6e PK |
110 | lock_sock(sk); |
111 | ssock = __mptcp_tcp_fallback(msk); | |
112 | if (ssock) { | |
113 | pr_debug("fallback passthrough"); | |
114 | ret = sock_sendmsg(ssock, msg); | |
115 | release_sock(sk); | |
116 | return ret; | |
117 | } | |
118 | ||
119 | ssk = mptcp_subflow_get(msk); | |
120 | if (!ssk) { | |
121 | release_sock(sk); | |
122 | return -ENOTCONN; | |
123 | } | |
124 | ||
125 | ret = sock_sendmsg(ssk->sk_socket, msg); | |
126 | ||
127 | release_sock(sk); | |
128 | return ret; | |
f870fa0b MM |
129 | } |
130 | ||
131 | static int mptcp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, | |
132 | int nonblock, int flags, int *addr_len) | |
133 | { | |
134 | struct mptcp_sock *msk = mptcp_sk(sk); | |
cec37a6e PK |
135 | struct socket *ssock; |
136 | struct sock *ssk; | |
137 | int copied = 0; | |
f870fa0b MM |
138 | |
139 | if (msg->msg_flags & ~(MSG_WAITALL | MSG_DONTWAIT)) | |
140 | return -EOPNOTSUPP; | |
141 | ||
cec37a6e PK |
142 | lock_sock(sk); |
143 | ssock = __mptcp_tcp_fallback(msk); | |
144 | if (ssock) { | |
145 | pr_debug("fallback-read subflow=%p", | |
146 | mptcp_subflow_ctx(ssock->sk)); | |
147 | copied = sock_recvmsg(ssock, msg, flags); | |
148 | release_sock(sk); | |
149 | return copied; | |
150 | } | |
151 | ||
152 | ssk = mptcp_subflow_get(msk); | |
153 | if (!ssk) { | |
154 | release_sock(sk); | |
155 | return -ENOTCONN; | |
156 | } | |
157 | ||
158 | copied = sock_recvmsg(ssk->sk_socket, msg, flags); | |
159 | ||
160 | release_sock(sk); | |
161 | ||
162 | return copied; | |
163 | } | |
164 | ||
165 | /* subflow sockets can be either outgoing (connect) or incoming | |
166 | * (accept). | |
167 | * | |
168 | * Outgoing subflows use in-kernel sockets. | |
169 | * Incoming subflows do not have their own 'struct socket' allocated, | |
170 | * so we need to use tcp_close() after detaching them from the mptcp | |
171 | * parent socket. | |
172 | */ | |
173 | static void __mptcp_close_ssk(struct sock *sk, struct sock *ssk, | |
174 | struct mptcp_subflow_context *subflow, | |
175 | long timeout) | |
176 | { | |
177 | struct socket *sock = READ_ONCE(ssk->sk_socket); | |
178 | ||
179 | list_del(&subflow->node); | |
180 | ||
181 | if (sock && sock != sk->sk_socket) { | |
182 | /* outgoing subflow */ | |
183 | sock_release(sock); | |
184 | } else { | |
185 | /* incoming subflow */ | |
186 | tcp_close(ssk, timeout); | |
187 | } | |
f870fa0b MM |
188 | } |
189 | ||
190 | static int mptcp_init_sock(struct sock *sk) | |
191 | { | |
cec37a6e PK |
192 | struct mptcp_sock *msk = mptcp_sk(sk); |
193 | ||
194 | INIT_LIST_HEAD(&msk->conn_list); | |
195 | ||
f870fa0b MM |
196 | return 0; |
197 | } | |
198 | ||
199 | static void mptcp_close(struct sock *sk, long timeout) | |
200 | { | |
cec37a6e | 201 | struct mptcp_subflow_context *subflow, *tmp; |
f870fa0b MM |
202 | struct mptcp_sock *msk = mptcp_sk(sk); |
203 | ||
79c0949e | 204 | mptcp_token_destroy(msk->token); |
f870fa0b MM |
205 | inet_sk_state_store(sk, TCP_CLOSE); |
206 | ||
cec37a6e PK |
207 | lock_sock(sk); |
208 | ||
209 | list_for_each_entry_safe(subflow, tmp, &msk->conn_list, node) { | |
210 | struct sock *ssk = mptcp_subflow_tcp_sock(subflow); | |
211 | ||
212 | __mptcp_close_ssk(sk, ssk, subflow, timeout); | |
f870fa0b MM |
213 | } |
214 | ||
cec37a6e PK |
215 | release_sock(sk); |
216 | sk_common_release(sk); | |
f870fa0b MM |
217 | } |
218 | ||
cf7da0d6 PK |
219 | static void mptcp_copy_inaddrs(struct sock *msk, const struct sock *ssk) |
220 | { | |
221 | #if IS_ENABLED(CONFIG_MPTCP_IPV6) | |
222 | const struct ipv6_pinfo *ssk6 = inet6_sk(ssk); | |
223 | struct ipv6_pinfo *msk6 = inet6_sk(msk); | |
224 | ||
225 | msk->sk_v6_daddr = ssk->sk_v6_daddr; | |
226 | msk->sk_v6_rcv_saddr = ssk->sk_v6_rcv_saddr; | |
227 | ||
228 | if (msk6 && ssk6) { | |
229 | msk6->saddr = ssk6->saddr; | |
230 | msk6->flow_label = ssk6->flow_label; | |
231 | } | |
232 | #endif | |
233 | ||
234 | inet_sk(msk)->inet_num = inet_sk(ssk)->inet_num; | |
235 | inet_sk(msk)->inet_dport = inet_sk(ssk)->inet_dport; | |
236 | inet_sk(msk)->inet_sport = inet_sk(ssk)->inet_sport; | |
237 | inet_sk(msk)->inet_daddr = inet_sk(ssk)->inet_daddr; | |
238 | inet_sk(msk)->inet_saddr = inet_sk(ssk)->inet_saddr; | |
239 | inet_sk(msk)->inet_rcv_saddr = inet_sk(ssk)->inet_rcv_saddr; | |
240 | } | |
241 | ||
242 | static struct sock *mptcp_accept(struct sock *sk, int flags, int *err, | |
243 | bool kern) | |
244 | { | |
245 | struct mptcp_sock *msk = mptcp_sk(sk); | |
246 | struct socket *listener; | |
247 | struct sock *newsk; | |
248 | ||
249 | listener = __mptcp_nmpc_socket(msk); | |
250 | if (WARN_ON_ONCE(!listener)) { | |
251 | *err = -EINVAL; | |
252 | return NULL; | |
253 | } | |
254 | ||
255 | pr_debug("msk=%p, listener=%p", msk, mptcp_subflow_ctx(listener->sk)); | |
256 | newsk = inet_csk_accept(listener->sk, flags, err, kern); | |
257 | if (!newsk) | |
258 | return NULL; | |
259 | ||
260 | pr_debug("msk=%p, subflow is mptcp=%d", msk, sk_is_mptcp(newsk)); | |
261 | ||
262 | if (sk_is_mptcp(newsk)) { | |
263 | struct mptcp_subflow_context *subflow; | |
264 | struct sock *new_mptcp_sock; | |
265 | struct sock *ssk = newsk; | |
266 | ||
267 | subflow = mptcp_subflow_ctx(newsk); | |
268 | lock_sock(sk); | |
269 | ||
270 | local_bh_disable(); | |
271 | new_mptcp_sock = sk_clone_lock(sk, GFP_ATOMIC); | |
272 | if (!new_mptcp_sock) { | |
273 | *err = -ENOBUFS; | |
274 | local_bh_enable(); | |
275 | release_sock(sk); | |
276 | tcp_close(newsk, 0); | |
277 | return NULL; | |
278 | } | |
279 | ||
280 | mptcp_init_sock(new_mptcp_sock); | |
281 | ||
282 | msk = mptcp_sk(new_mptcp_sock); | |
283 | msk->remote_key = subflow->remote_key; | |
284 | msk->local_key = subflow->local_key; | |
79c0949e | 285 | msk->token = subflow->token; |
cf7da0d6 PK |
286 | msk->subflow = NULL; |
287 | ||
79c0949e | 288 | mptcp_token_update_accept(newsk, new_mptcp_sock); |
cf7da0d6 PK |
289 | newsk = new_mptcp_sock; |
290 | mptcp_copy_inaddrs(newsk, ssk); | |
291 | list_add(&subflow->node, &msk->conn_list); | |
292 | ||
293 | /* will be fully established at mptcp_stream_accept() | |
294 | * completion. | |
295 | */ | |
296 | inet_sk_state_store(new_mptcp_sock, TCP_SYN_RECV); | |
297 | bh_unlock_sock(new_mptcp_sock); | |
298 | local_bh_enable(); | |
299 | release_sock(sk); | |
300 | } | |
301 | ||
302 | return newsk; | |
303 | } | |
304 | ||
79c0949e PK |
305 | static void mptcp_destroy(struct sock *sk) |
306 | { | |
307 | } | |
308 | ||
cec37a6e | 309 | static int mptcp_get_port(struct sock *sk, unsigned short snum) |
f870fa0b MM |
310 | { |
311 | struct mptcp_sock *msk = mptcp_sk(sk); | |
cec37a6e | 312 | struct socket *ssock; |
f870fa0b | 313 | |
cec37a6e PK |
314 | ssock = __mptcp_nmpc_socket(msk); |
315 | pr_debug("msk=%p, subflow=%p", msk, ssock); | |
316 | if (WARN_ON_ONCE(!ssock)) | |
317 | return -EINVAL; | |
f870fa0b | 318 | |
cec37a6e PK |
319 | return inet_csk_get_port(ssock->sk, snum); |
320 | } | |
f870fa0b | 321 | |
cec37a6e PK |
322 | void mptcp_finish_connect(struct sock *ssk) |
323 | { | |
324 | struct mptcp_subflow_context *subflow; | |
325 | struct mptcp_sock *msk; | |
326 | struct sock *sk; | |
f870fa0b | 327 | |
cec37a6e | 328 | subflow = mptcp_subflow_ctx(ssk); |
f870fa0b | 329 | |
cec37a6e PK |
330 | if (!subflow->mp_capable) |
331 | return; | |
332 | ||
333 | sk = subflow->conn; | |
334 | msk = mptcp_sk(sk); | |
335 | ||
336 | /* the socket is not connected yet, no msk/subflow ops can access/race | |
337 | * accessing the field below | |
338 | */ | |
339 | WRITE_ONCE(msk->remote_key, subflow->remote_key); | |
340 | WRITE_ONCE(msk->local_key, subflow->local_key); | |
79c0949e | 341 | WRITE_ONCE(msk->token, subflow->token); |
f870fa0b MM |
342 | } |
343 | ||
cf7da0d6 PK |
344 | static void mptcp_sock_graft(struct sock *sk, struct socket *parent) |
345 | { | |
346 | write_lock_bh(&sk->sk_callback_lock); | |
347 | rcu_assign_pointer(sk->sk_wq, &parent->wq); | |
348 | sk_set_socket(sk, parent); | |
349 | sk->sk_uid = SOCK_INODE(parent)->i_uid; | |
350 | write_unlock_bh(&sk->sk_callback_lock); | |
351 | } | |
352 | ||
f870fa0b MM |
353 | static struct proto mptcp_prot = { |
354 | .name = "MPTCP", | |
355 | .owner = THIS_MODULE, | |
356 | .init = mptcp_init_sock, | |
357 | .close = mptcp_close, | |
cf7da0d6 | 358 | .accept = mptcp_accept, |
f870fa0b | 359 | .shutdown = tcp_shutdown, |
79c0949e | 360 | .destroy = mptcp_destroy, |
f870fa0b MM |
361 | .sendmsg = mptcp_sendmsg, |
362 | .recvmsg = mptcp_recvmsg, | |
363 | .hash = inet_hash, | |
364 | .unhash = inet_unhash, | |
cec37a6e | 365 | .get_port = mptcp_get_port, |
f870fa0b MM |
366 | .obj_size = sizeof(struct mptcp_sock), |
367 | .no_autobind = true, | |
368 | }; | |
369 | ||
2303f994 PK |
370 | static int mptcp_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) |
371 | { | |
372 | struct mptcp_sock *msk = mptcp_sk(sock->sk); | |
373 | struct socket *ssock; | |
cf7da0d6 | 374 | int err; |
2303f994 PK |
375 | |
376 | lock_sock(sock->sk); | |
377 | ssock = __mptcp_socket_create(msk, MPTCP_SAME_STATE); | |
378 | if (IS_ERR(ssock)) { | |
379 | err = PTR_ERR(ssock); | |
380 | goto unlock; | |
381 | } | |
382 | ||
383 | err = ssock->ops->bind(ssock, uaddr, addr_len); | |
cf7da0d6 PK |
384 | if (!err) |
385 | mptcp_copy_inaddrs(sock->sk, ssock->sk); | |
2303f994 PK |
386 | |
387 | unlock: | |
388 | release_sock(sock->sk); | |
389 | return err; | |
390 | } | |
391 | ||
392 | static int mptcp_stream_connect(struct socket *sock, struct sockaddr *uaddr, | |
393 | int addr_len, int flags) | |
394 | { | |
395 | struct mptcp_sock *msk = mptcp_sk(sock->sk); | |
396 | struct socket *ssock; | |
397 | int err; | |
398 | ||
399 | lock_sock(sock->sk); | |
400 | ssock = __mptcp_socket_create(msk, TCP_SYN_SENT); | |
401 | if (IS_ERR(ssock)) { | |
402 | err = PTR_ERR(ssock); | |
403 | goto unlock; | |
404 | } | |
405 | ||
cf7da0d6 PK |
406 | #ifdef CONFIG_TCP_MD5SIG |
407 | /* no MPTCP if MD5SIG is enabled on this socket or we may run out of | |
408 | * TCP option space. | |
409 | */ | |
410 | if (rcu_access_pointer(tcp_sk(ssock->sk)->md5sig_info)) | |
411 | mptcp_subflow_ctx(ssock->sk)->request_mptcp = 0; | |
412 | #endif | |
413 | ||
2303f994 PK |
414 | err = ssock->ops->connect(ssock, uaddr, addr_len, flags); |
415 | inet_sk_state_store(sock->sk, inet_sk_state_load(ssock->sk)); | |
cf7da0d6 | 416 | mptcp_copy_inaddrs(sock->sk, ssock->sk); |
2303f994 PK |
417 | |
418 | unlock: | |
419 | release_sock(sock->sk); | |
420 | return err; | |
421 | } | |
422 | ||
cf7da0d6 PK |
423 | static int mptcp_v4_getname(struct socket *sock, struct sockaddr *uaddr, |
424 | int peer) | |
425 | { | |
426 | if (sock->sk->sk_prot == &tcp_prot) { | |
427 | /* we are being invoked from __sys_accept4, after | |
428 | * mptcp_accept() has just accepted a non-mp-capable | |
429 | * flow: sk is a tcp_sk, not an mptcp one. | |
430 | * | |
431 | * Hand the socket over to tcp so all further socket ops | |
432 | * bypass mptcp. | |
433 | */ | |
434 | sock->ops = &inet_stream_ops; | |
435 | } | |
436 | ||
437 | return inet_getname(sock, uaddr, peer); | |
438 | } | |
439 | ||
440 | #if IS_ENABLED(CONFIG_MPTCP_IPV6) | |
441 | static int mptcp_v6_getname(struct socket *sock, struct sockaddr *uaddr, | |
442 | int peer) | |
443 | { | |
444 | if (sock->sk->sk_prot == &tcpv6_prot) { | |
445 | /* we are being invoked from __sys_accept4 after | |
446 | * mptcp_accept() has accepted a non-mp-capable | |
447 | * subflow: sk is a tcp_sk, not mptcp. | |
448 | * | |
449 | * Hand the socket over to tcp so all further | |
450 | * socket ops bypass mptcp. | |
451 | */ | |
452 | sock->ops = &inet6_stream_ops; | |
453 | } | |
454 | ||
455 | return inet6_getname(sock, uaddr, peer); | |
456 | } | |
457 | #endif | |
458 | ||
459 | static int mptcp_listen(struct socket *sock, int backlog) | |
460 | { | |
461 | struct mptcp_sock *msk = mptcp_sk(sock->sk); | |
462 | struct socket *ssock; | |
463 | int err; | |
464 | ||
465 | pr_debug("msk=%p", msk); | |
466 | ||
467 | lock_sock(sock->sk); | |
468 | ssock = __mptcp_socket_create(msk, TCP_LISTEN); | |
469 | if (IS_ERR(ssock)) { | |
470 | err = PTR_ERR(ssock); | |
471 | goto unlock; | |
472 | } | |
473 | ||
474 | err = ssock->ops->listen(ssock, backlog); | |
475 | inet_sk_state_store(sock->sk, inet_sk_state_load(ssock->sk)); | |
476 | if (!err) | |
477 | mptcp_copy_inaddrs(sock->sk, ssock->sk); | |
478 | ||
479 | unlock: | |
480 | release_sock(sock->sk); | |
481 | return err; | |
482 | } | |
483 | ||
484 | static bool is_tcp_proto(const struct proto *p) | |
485 | { | |
486 | #if IS_ENABLED(CONFIG_MPTCP_IPV6) | |
487 | return p == &tcp_prot || p == &tcpv6_prot; | |
488 | #else | |
489 | return p == &tcp_prot; | |
490 | #endif | |
491 | } | |
492 | ||
493 | static int mptcp_stream_accept(struct socket *sock, struct socket *newsock, | |
494 | int flags, bool kern) | |
495 | { | |
496 | struct mptcp_sock *msk = mptcp_sk(sock->sk); | |
497 | struct socket *ssock; | |
498 | int err; | |
499 | ||
500 | pr_debug("msk=%p", msk); | |
501 | ||
502 | lock_sock(sock->sk); | |
503 | if (sock->sk->sk_state != TCP_LISTEN) | |
504 | goto unlock_fail; | |
505 | ||
506 | ssock = __mptcp_nmpc_socket(msk); | |
507 | if (!ssock) | |
508 | goto unlock_fail; | |
509 | ||
510 | sock_hold(ssock->sk); | |
511 | release_sock(sock->sk); | |
512 | ||
513 | err = ssock->ops->accept(sock, newsock, flags, kern); | |
514 | if (err == 0 && !is_tcp_proto(newsock->sk->sk_prot)) { | |
515 | struct mptcp_sock *msk = mptcp_sk(newsock->sk); | |
516 | struct mptcp_subflow_context *subflow; | |
517 | ||
518 | /* set ssk->sk_socket of accept()ed flows to mptcp socket. | |
519 | * This is needed so NOSPACE flag can be set from tcp stack. | |
520 | */ | |
521 | list_for_each_entry(subflow, &msk->conn_list, node) { | |
522 | struct sock *ssk = mptcp_subflow_tcp_sock(subflow); | |
523 | ||
524 | if (!ssk->sk_socket) | |
525 | mptcp_sock_graft(ssk, newsock); | |
526 | } | |
527 | ||
528 | inet_sk_state_store(newsock->sk, TCP_ESTABLISHED); | |
529 | } | |
530 | ||
531 | sock_put(ssock->sk); | |
532 | return err; | |
533 | ||
534 | unlock_fail: | |
535 | release_sock(sock->sk); | |
536 | return -EINVAL; | |
537 | } | |
538 | ||
2303f994 PK |
539 | static __poll_t mptcp_poll(struct file *file, struct socket *sock, |
540 | struct poll_table_struct *wait) | |
541 | { | |
542 | __poll_t mask = 0; | |
543 | ||
544 | return mask; | |
545 | } | |
546 | ||
547 | static struct proto_ops mptcp_stream_ops; | |
548 | ||
f870fa0b MM |
549 | static struct inet_protosw mptcp_protosw = { |
550 | .type = SOCK_STREAM, | |
551 | .protocol = IPPROTO_MPTCP, | |
552 | .prot = &mptcp_prot, | |
2303f994 PK |
553 | .ops = &mptcp_stream_ops, |
554 | .flags = INET_PROTOSW_ICSK, | |
f870fa0b MM |
555 | }; |
556 | ||
557 | void __init mptcp_init(void) | |
558 | { | |
2303f994 PK |
559 | mptcp_prot.h.hashinfo = tcp_prot.h.hashinfo; |
560 | mptcp_stream_ops = inet_stream_ops; | |
561 | mptcp_stream_ops.bind = mptcp_bind; | |
562 | mptcp_stream_ops.connect = mptcp_stream_connect; | |
563 | mptcp_stream_ops.poll = mptcp_poll; | |
cf7da0d6 PK |
564 | mptcp_stream_ops.accept = mptcp_stream_accept; |
565 | mptcp_stream_ops.getname = mptcp_v4_getname; | |
566 | mptcp_stream_ops.listen = mptcp_listen; | |
2303f994 PK |
567 | |
568 | mptcp_subflow_init(); | |
569 | ||
f870fa0b MM |
570 | if (proto_register(&mptcp_prot, 1) != 0) |
571 | panic("Failed to register MPTCP proto.\n"); | |
572 | ||
573 | inet_register_protosw(&mptcp_protosw); | |
574 | } | |
575 | ||
576 | #if IS_ENABLED(CONFIG_MPTCP_IPV6) | |
2303f994 | 577 | static struct proto_ops mptcp_v6_stream_ops; |
f870fa0b MM |
578 | static struct proto mptcp_v6_prot; |
579 | ||
79c0949e PK |
580 | static void mptcp_v6_destroy(struct sock *sk) |
581 | { | |
582 | mptcp_destroy(sk); | |
583 | inet6_destroy_sock(sk); | |
584 | } | |
585 | ||
f870fa0b MM |
586 | static struct inet_protosw mptcp_v6_protosw = { |
587 | .type = SOCK_STREAM, | |
588 | .protocol = IPPROTO_MPTCP, | |
589 | .prot = &mptcp_v6_prot, | |
2303f994 | 590 | .ops = &mptcp_v6_stream_ops, |
f870fa0b MM |
591 | .flags = INET_PROTOSW_ICSK, |
592 | }; | |
593 | ||
594 | int mptcpv6_init(void) | |
595 | { | |
596 | int err; | |
597 | ||
598 | mptcp_v6_prot = mptcp_prot; | |
599 | strcpy(mptcp_v6_prot.name, "MPTCPv6"); | |
600 | mptcp_v6_prot.slab = NULL; | |
79c0949e | 601 | mptcp_v6_prot.destroy = mptcp_v6_destroy; |
f870fa0b MM |
602 | mptcp_v6_prot.obj_size = sizeof(struct mptcp_sock) + |
603 | sizeof(struct ipv6_pinfo); | |
604 | ||
605 | err = proto_register(&mptcp_v6_prot, 1); | |
606 | if (err) | |
607 | return err; | |
608 | ||
2303f994 PK |
609 | mptcp_v6_stream_ops = inet6_stream_ops; |
610 | mptcp_v6_stream_ops.bind = mptcp_bind; | |
611 | mptcp_v6_stream_ops.connect = mptcp_stream_connect; | |
612 | mptcp_v6_stream_ops.poll = mptcp_poll; | |
cf7da0d6 PK |
613 | mptcp_v6_stream_ops.accept = mptcp_stream_accept; |
614 | mptcp_v6_stream_ops.getname = mptcp_v6_getname; | |
615 | mptcp_v6_stream_ops.listen = mptcp_listen; | |
2303f994 | 616 | |
f870fa0b MM |
617 | err = inet6_register_protosw(&mptcp_v6_protosw); |
618 | if (err) | |
619 | proto_unregister(&mptcp_v6_prot); | |
620 | ||
621 | return err; | |
622 | } | |
623 | #endif |