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 | #define pr_fmt(fmt) "MPTCP: " fmt | |
8 | ||
9 | #include <linux/kernel.h> | |
10 | #include <linux/module.h> | |
11 | #include <linux/netdevice.h> | |
7a6a6cbc PA |
12 | #include <linux/sched/signal.h> |
13 | #include <linux/atomic.h> | |
f870fa0b MM |
14 | #include <net/sock.h> |
15 | #include <net/inet_common.h> | |
16 | #include <net/inet_hashtables.h> | |
17 | #include <net/protocol.h> | |
18 | #include <net/tcp.h> | |
cf7da0d6 PK |
19 | #if IS_ENABLED(CONFIG_MPTCP_IPV6) |
20 | #include <net/transp_v6.h> | |
21 | #endif | |
f870fa0b MM |
22 | #include <net/mptcp.h> |
23 | #include "protocol.h" | |
24 | ||
2303f994 PK |
25 | #define MPTCP_SAME_STATE TCP_MAX_STATES |
26 | ||
27 | /* If msk has an initial subflow socket, and the MP_CAPABLE handshake has not | |
28 | * completed yet or has failed, return the subflow socket. | |
29 | * Otherwise return NULL. | |
30 | */ | |
31 | static struct socket *__mptcp_nmpc_socket(const struct mptcp_sock *msk) | |
32 | { | |
d22f4988 | 33 | if (!msk->subflow || READ_ONCE(msk->can_ack)) |
2303f994 PK |
34 | return NULL; |
35 | ||
36 | return msk->subflow; | |
37 | } | |
38 | ||
8ab183de PA |
39 | static bool __mptcp_needs_tcp_fallback(const struct mptcp_sock *msk) |
40 | { | |
41 | return msk->first && !sk_is_mptcp(msk->first); | |
42 | } | |
43 | ||
8ab183de | 44 | static struct socket *__mptcp_tcp_fallback(struct mptcp_sock *msk) |
cec37a6e | 45 | { |
cec37a6e PK |
46 | sock_owned_by_me((const struct sock *)msk); |
47 | ||
8ab183de | 48 | if (likely(!__mptcp_needs_tcp_fallback(msk))) |
cec37a6e PK |
49 | return NULL; |
50 | ||
8ab183de | 51 | if (msk->subflow) { |
2c22c06c FW |
52 | release_sock((struct sock *)msk); |
53 | return msk->subflow; | |
8ab183de PA |
54 | } |
55 | ||
2c22c06c | 56 | return NULL; |
cec37a6e PK |
57 | } |
58 | ||
2303f994 PK |
59 | static bool __mptcp_can_create_subflow(const struct mptcp_sock *msk) |
60 | { | |
8ab183de | 61 | return !msk->first; |
2303f994 PK |
62 | } |
63 | ||
64 | static struct socket *__mptcp_socket_create(struct mptcp_sock *msk, int state) | |
65 | { | |
66 | struct mptcp_subflow_context *subflow; | |
67 | struct sock *sk = (struct sock *)msk; | |
68 | struct socket *ssock; | |
69 | int err; | |
70 | ||
71 | ssock = __mptcp_nmpc_socket(msk); | |
72 | if (ssock) | |
73 | goto set_state; | |
74 | ||
75 | if (!__mptcp_can_create_subflow(msk)) | |
76 | return ERR_PTR(-EINVAL); | |
77 | ||
78 | err = mptcp_subflow_create_socket(sk, &ssock); | |
79 | if (err) | |
80 | return ERR_PTR(err); | |
81 | ||
8ab183de | 82 | msk->first = ssock->sk; |
2303f994 PK |
83 | msk->subflow = ssock; |
84 | subflow = mptcp_subflow_ctx(ssock->sk); | |
cec37a6e | 85 | list_add(&subflow->node, &msk->conn_list); |
2303f994 PK |
86 | subflow->request_mptcp = 1; |
87 | ||
88 | set_state: | |
89 | if (state != MPTCP_SAME_STATE) | |
90 | inet_sk_state_store(sk, state); | |
91 | return ssock; | |
92 | } | |
93 | ||
cec37a6e PK |
94 | static struct sock *mptcp_subflow_get(const struct mptcp_sock *msk) |
95 | { | |
96 | struct mptcp_subflow_context *subflow; | |
97 | ||
98 | sock_owned_by_me((const struct sock *)msk); | |
99 | ||
100 | mptcp_for_each_subflow(msk, subflow) { | |
101 | return mptcp_subflow_tcp_sock(subflow); | |
102 | } | |
103 | ||
104 | return NULL; | |
105 | } | |
106 | ||
6d0060f6 MM |
107 | static bool mptcp_ext_cache_refill(struct mptcp_sock *msk) |
108 | { | |
109 | if (!msk->cached_ext) | |
110 | msk->cached_ext = __skb_ext_alloc(); | |
111 | ||
112 | return !!msk->cached_ext; | |
113 | } | |
114 | ||
7a6a6cbc PA |
115 | static struct sock *mptcp_subflow_recv_lookup(const struct mptcp_sock *msk) |
116 | { | |
117 | struct mptcp_subflow_context *subflow; | |
118 | struct sock *sk = (struct sock *)msk; | |
119 | ||
120 | sock_owned_by_me(sk); | |
121 | ||
122 | mptcp_for_each_subflow(msk, subflow) { | |
123 | if (subflow->data_avail) | |
124 | return mptcp_subflow_tcp_sock(subflow); | |
125 | } | |
126 | ||
127 | return NULL; | |
128 | } | |
129 | ||
57040755 PA |
130 | static inline bool mptcp_skb_can_collapse_to(const struct mptcp_sock *msk, |
131 | const struct sk_buff *skb, | |
132 | const struct mptcp_ext *mpext) | |
133 | { | |
134 | if (!tcp_skb_can_collapse_to(skb)) | |
135 | return false; | |
136 | ||
137 | /* can collapse only if MPTCP level sequence is in order */ | |
138 | return mpext && mpext->data_seq + mpext->data_len == msk->write_seq; | |
139 | } | |
140 | ||
6d0060f6 | 141 | static int mptcp_sendmsg_frag(struct sock *sk, struct sock *ssk, |
57040755 PA |
142 | struct msghdr *msg, long *timeo, int *pmss_now, |
143 | int *ps_goal) | |
6d0060f6 | 144 | { |
57040755 | 145 | int mss_now, avail_size, size_goal, ret; |
6d0060f6 MM |
146 | struct mptcp_sock *msk = mptcp_sk(sk); |
147 | struct mptcp_ext *mpext = NULL; | |
57040755 PA |
148 | struct sk_buff *skb, *tail; |
149 | bool can_collapse = false; | |
6d0060f6 | 150 | struct page_frag *pfrag; |
6d0060f6 MM |
151 | size_t psize; |
152 | ||
153 | /* use the mptcp page cache so that we can easily move the data | |
154 | * from one substream to another, but do per subflow memory accounting | |
155 | */ | |
156 | pfrag = sk_page_frag(sk); | |
157 | while (!sk_page_frag_refill(ssk, pfrag) || | |
158 | !mptcp_ext_cache_refill(msk)) { | |
159 | ret = sk_stream_wait_memory(ssk, timeo); | |
160 | if (ret) | |
161 | return ret; | |
8ab183de PA |
162 | if (unlikely(__mptcp_needs_tcp_fallback(msk))) |
163 | return 0; | |
6d0060f6 MM |
164 | } |
165 | ||
166 | /* compute copy limit */ | |
167 | mss_now = tcp_send_mss(ssk, &size_goal, msg->msg_flags); | |
57040755 PA |
168 | *pmss_now = mss_now; |
169 | *ps_goal = size_goal; | |
170 | avail_size = size_goal; | |
171 | skb = tcp_write_queue_tail(ssk); | |
172 | if (skb) { | |
173 | mpext = skb_ext_find(skb, SKB_EXT_MPTCP); | |
174 | ||
175 | /* Limit the write to the size available in the | |
176 | * current skb, if any, so that we create at most a new skb. | |
177 | * Explicitly tells TCP internals to avoid collapsing on later | |
178 | * queue management operation, to avoid breaking the ext <-> | |
179 | * SSN association set here | |
180 | */ | |
181 | can_collapse = (size_goal - skb->len > 0) && | |
182 | mptcp_skb_can_collapse_to(msk, skb, mpext); | |
183 | if (!can_collapse) | |
184 | TCP_SKB_CB(skb)->eor = 1; | |
185 | else | |
186 | avail_size = size_goal - skb->len; | |
187 | } | |
188 | psize = min_t(size_t, pfrag->size - pfrag->offset, avail_size); | |
6d0060f6 | 189 | |
57040755 | 190 | /* Copy to page */ |
6d0060f6 MM |
191 | pr_debug("left=%zu", msg_data_left(msg)); |
192 | psize = copy_page_from_iter(pfrag->page, pfrag->offset, | |
193 | min_t(size_t, msg_data_left(msg), psize), | |
194 | &msg->msg_iter); | |
195 | pr_debug("left=%zu", msg_data_left(msg)); | |
196 | if (!psize) | |
197 | return -EINVAL; | |
198 | ||
57040755 PA |
199 | /* tell the TCP stack to delay the push so that we can safely |
200 | * access the skb after the sendpages call | |
6d0060f6 | 201 | */ |
6d0060f6 MM |
202 | ret = do_tcp_sendpages(ssk, pfrag->page, pfrag->offset, psize, |
203 | msg->msg_flags | MSG_SENDPAGE_NOTLAST); | |
204 | if (ret <= 0) | |
205 | return ret; | |
206 | if (unlikely(ret < psize)) | |
207 | iov_iter_revert(&msg->msg_iter, psize - ret); | |
208 | ||
57040755 PA |
209 | /* if the tail skb extension is still the cached one, collapsing |
210 | * really happened. Note: we can't check for 'same skb' as the sk_buff | |
211 | * hdr on tail can be transmitted, freed and re-allocated by the | |
212 | * do_tcp_sendpages() call | |
213 | */ | |
214 | tail = tcp_write_queue_tail(ssk); | |
215 | if (mpext && tail && mpext == skb_ext_find(tail, SKB_EXT_MPTCP)) { | |
216 | WARN_ON_ONCE(!can_collapse); | |
217 | mpext->data_len += ret; | |
218 | goto out; | |
219 | } | |
220 | ||
6d0060f6 MM |
221 | skb = tcp_write_queue_tail(ssk); |
222 | mpext = __skb_ext_set(skb, SKB_EXT_MPTCP, msk->cached_ext); | |
223 | msk->cached_ext = NULL; | |
224 | ||
225 | memset(mpext, 0, sizeof(*mpext)); | |
226 | mpext->data_seq = msk->write_seq; | |
227 | mpext->subflow_seq = mptcp_subflow_ctx(ssk)->rel_write_seq; | |
228 | mpext->data_len = ret; | |
229 | mpext->use_map = 1; | |
230 | mpext->dsn64 = 1; | |
231 | ||
232 | pr_debug("data_seq=%llu subflow_seq=%u data_len=%u dsn64=%d", | |
233 | mpext->data_seq, mpext->subflow_seq, mpext->data_len, | |
234 | mpext->dsn64); | |
235 | ||
57040755 | 236 | out: |
6d0060f6 MM |
237 | pfrag->offset += ret; |
238 | msk->write_seq += ret; | |
239 | mptcp_subflow_ctx(ssk)->rel_write_seq += ret; | |
240 | ||
6d0060f6 MM |
241 | return ret; |
242 | } | |
243 | ||
1891c4a0 FW |
244 | static void ssk_check_wmem(struct mptcp_sock *msk, struct sock *ssk) |
245 | { | |
246 | struct socket *sock; | |
247 | ||
248 | if (likely(sk_stream_is_writeable(ssk))) | |
249 | return; | |
250 | ||
251 | sock = READ_ONCE(ssk->sk_socket); | |
252 | ||
253 | if (sock) { | |
254 | clear_bit(MPTCP_SEND_SPACE, &msk->flags); | |
255 | smp_mb__after_atomic(); | |
256 | /* set NOSPACE only after clearing SEND_SPACE flag */ | |
257 | set_bit(SOCK_NOSPACE, &sock->flags); | |
258 | } | |
259 | } | |
260 | ||
f870fa0b MM |
261 | static int mptcp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) |
262 | { | |
57040755 | 263 | int mss_now = 0, size_goal = 0, ret = 0; |
f870fa0b | 264 | struct mptcp_sock *msk = mptcp_sk(sk); |
cec37a6e | 265 | struct socket *ssock; |
6d0060f6 | 266 | size_t copied = 0; |
cec37a6e | 267 | struct sock *ssk; |
6d0060f6 | 268 | long timeo; |
f870fa0b MM |
269 | |
270 | if (msg->msg_flags & ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL)) | |
271 | return -EOPNOTSUPP; | |
272 | ||
cec37a6e PK |
273 | lock_sock(sk); |
274 | ssock = __mptcp_tcp_fallback(msk); | |
8ab183de PA |
275 | if (unlikely(ssock)) { |
276 | fallback: | |
cec37a6e PK |
277 | pr_debug("fallback passthrough"); |
278 | ret = sock_sendmsg(ssock, msg); | |
8ab183de | 279 | return ret >= 0 ? ret + copied : (copied ? copied : ret); |
cec37a6e PK |
280 | } |
281 | ||
6d0060f6 MM |
282 | timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); |
283 | ||
cec37a6e PK |
284 | ssk = mptcp_subflow_get(msk); |
285 | if (!ssk) { | |
286 | release_sock(sk); | |
287 | return -ENOTCONN; | |
288 | } | |
289 | ||
6d0060f6 | 290 | pr_debug("conn_list->subflow=%p", ssk); |
cec37a6e | 291 | |
6d0060f6 MM |
292 | lock_sock(ssk); |
293 | while (msg_data_left(msg)) { | |
57040755 PA |
294 | ret = mptcp_sendmsg_frag(sk, ssk, msg, &timeo, &mss_now, |
295 | &size_goal); | |
6d0060f6 MM |
296 | if (ret < 0) |
297 | break; | |
8ab183de PA |
298 | if (ret == 0 && unlikely(__mptcp_needs_tcp_fallback(msk))) { |
299 | release_sock(ssk); | |
300 | ssock = __mptcp_tcp_fallback(msk); | |
301 | goto fallback; | |
302 | } | |
6d0060f6 MM |
303 | |
304 | copied += ret; | |
305 | } | |
306 | ||
57040755 | 307 | if (copied) { |
6d0060f6 | 308 | ret = copied; |
57040755 PA |
309 | tcp_push(ssk, msg->msg_flags, mss_now, tcp_sk(ssk)->nonagle, |
310 | size_goal); | |
311 | } | |
6d0060f6 | 312 | |
1891c4a0 | 313 | ssk_check_wmem(msk, ssk); |
6d0060f6 | 314 | release_sock(ssk); |
cec37a6e PK |
315 | release_sock(sk); |
316 | return ret; | |
f870fa0b MM |
317 | } |
318 | ||
648ef4b8 MM |
319 | int mptcp_read_actor(read_descriptor_t *desc, struct sk_buff *skb, |
320 | unsigned int offset, size_t len) | |
321 | { | |
322 | struct mptcp_read_arg *arg = desc->arg.data; | |
323 | size_t copy_len; | |
324 | ||
325 | copy_len = min(desc->count, len); | |
326 | ||
327 | if (likely(arg->msg)) { | |
328 | int err; | |
329 | ||
330 | err = skb_copy_datagram_msg(skb, offset, arg->msg, copy_len); | |
331 | if (err) { | |
332 | pr_debug("error path"); | |
333 | desc->error = err; | |
334 | return err; | |
335 | } | |
336 | } else { | |
337 | pr_debug("Flushing skb payload"); | |
338 | } | |
339 | ||
340 | desc->count -= copy_len; | |
341 | ||
342 | pr_debug("consumed %zu bytes, %zu left", copy_len, desc->count); | |
343 | return copy_len; | |
344 | } | |
345 | ||
7a6a6cbc PA |
346 | static void mptcp_wait_data(struct sock *sk, long *timeo) |
347 | { | |
348 | DEFINE_WAIT_FUNC(wait, woken_wake_function); | |
349 | struct mptcp_sock *msk = mptcp_sk(sk); | |
350 | ||
351 | add_wait_queue(sk_sleep(sk), &wait); | |
352 | sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk); | |
353 | ||
354 | sk_wait_event(sk, timeo, | |
355 | test_and_clear_bit(MPTCP_DATA_READY, &msk->flags), &wait); | |
356 | ||
357 | sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk); | |
358 | remove_wait_queue(sk_sleep(sk), &wait); | |
359 | } | |
360 | ||
f870fa0b MM |
361 | static int mptcp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, |
362 | int nonblock, int flags, int *addr_len) | |
363 | { | |
364 | struct mptcp_sock *msk = mptcp_sk(sk); | |
7a6a6cbc PA |
365 | struct mptcp_subflow_context *subflow; |
366 | bool more_data_avail = false; | |
367 | struct mptcp_read_arg arg; | |
368 | read_descriptor_t desc; | |
369 | bool wait_data = false; | |
cec37a6e | 370 | struct socket *ssock; |
7a6a6cbc PA |
371 | struct tcp_sock *tp; |
372 | bool done = false; | |
cec37a6e PK |
373 | struct sock *ssk; |
374 | int copied = 0; | |
7a6a6cbc PA |
375 | int target; |
376 | long timeo; | |
f870fa0b MM |
377 | |
378 | if (msg->msg_flags & ~(MSG_WAITALL | MSG_DONTWAIT)) | |
379 | return -EOPNOTSUPP; | |
380 | ||
cec37a6e PK |
381 | lock_sock(sk); |
382 | ssock = __mptcp_tcp_fallback(msk); | |
8ab183de PA |
383 | if (unlikely(ssock)) { |
384 | fallback: | |
cec37a6e PK |
385 | pr_debug("fallback-read subflow=%p", |
386 | mptcp_subflow_ctx(ssock->sk)); | |
387 | copied = sock_recvmsg(ssock, msg, flags); | |
cec37a6e PK |
388 | return copied; |
389 | } | |
390 | ||
7a6a6cbc PA |
391 | arg.msg = msg; |
392 | desc.arg.data = &arg; | |
393 | desc.error = 0; | |
394 | ||
395 | timeo = sock_rcvtimeo(sk, nonblock); | |
396 | ||
397 | len = min_t(size_t, len, INT_MAX); | |
398 | target = sock_rcvlowat(sk, flags & MSG_WAITALL, len); | |
399 | ||
400 | while (!done) { | |
401 | u32 map_remaining; | |
402 | int bytes_read; | |
403 | ||
404 | ssk = mptcp_subflow_recv_lookup(msk); | |
405 | pr_debug("msk=%p ssk=%p", msk, ssk); | |
406 | if (!ssk) | |
407 | goto wait_for_data; | |
408 | ||
409 | subflow = mptcp_subflow_ctx(ssk); | |
410 | tp = tcp_sk(ssk); | |
411 | ||
412 | lock_sock(ssk); | |
413 | do { | |
414 | /* try to read as much data as available */ | |
415 | map_remaining = subflow->map_data_len - | |
416 | mptcp_subflow_get_map_offset(subflow); | |
417 | desc.count = min_t(size_t, len - copied, map_remaining); | |
418 | pr_debug("reading %zu bytes, copied %d", desc.count, | |
419 | copied); | |
420 | bytes_read = tcp_read_sock(ssk, &desc, | |
421 | mptcp_read_actor); | |
422 | if (bytes_read < 0) { | |
423 | if (!copied) | |
424 | copied = bytes_read; | |
425 | done = true; | |
426 | goto next; | |
427 | } | |
428 | ||
429 | pr_debug("msk ack_seq=%llx -> %llx", msk->ack_seq, | |
430 | msk->ack_seq + bytes_read); | |
431 | msk->ack_seq += bytes_read; | |
432 | copied += bytes_read; | |
433 | if (copied >= len) { | |
434 | done = true; | |
435 | goto next; | |
436 | } | |
437 | if (tp->urg_data && tp->urg_seq == tp->copied_seq) { | |
438 | pr_err("Urgent data present, cannot proceed"); | |
439 | done = true; | |
440 | goto next; | |
441 | } | |
442 | next: | |
443 | more_data_avail = mptcp_subflow_data_available(ssk); | |
444 | } while (more_data_avail && !done); | |
445 | release_sock(ssk); | |
446 | continue; | |
447 | ||
448 | wait_for_data: | |
449 | more_data_avail = false; | |
450 | ||
451 | /* only the master socket status is relevant here. The exit | |
452 | * conditions mirror closely tcp_recvmsg() | |
453 | */ | |
454 | if (copied >= target) | |
455 | break; | |
456 | ||
457 | if (copied) { | |
458 | if (sk->sk_err || | |
459 | sk->sk_state == TCP_CLOSE || | |
460 | (sk->sk_shutdown & RCV_SHUTDOWN) || | |
461 | !timeo || | |
462 | signal_pending(current)) | |
463 | break; | |
464 | } else { | |
465 | if (sk->sk_err) { | |
466 | copied = sock_error(sk); | |
467 | break; | |
468 | } | |
469 | ||
470 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
471 | break; | |
472 | ||
473 | if (sk->sk_state == TCP_CLOSE) { | |
474 | copied = -ENOTCONN; | |
475 | break; | |
476 | } | |
477 | ||
478 | if (!timeo) { | |
479 | copied = -EAGAIN; | |
480 | break; | |
481 | } | |
482 | ||
483 | if (signal_pending(current)) { | |
484 | copied = sock_intr_errno(timeo); | |
485 | break; | |
486 | } | |
487 | } | |
488 | ||
489 | pr_debug("block timeout %ld", timeo); | |
490 | wait_data = true; | |
491 | mptcp_wait_data(sk, &timeo); | |
8ab183de PA |
492 | if (unlikely(__mptcp_tcp_fallback(msk))) |
493 | goto fallback; | |
cec37a6e PK |
494 | } |
495 | ||
7a6a6cbc PA |
496 | if (more_data_avail) { |
497 | if (!test_bit(MPTCP_DATA_READY, &msk->flags)) | |
498 | set_bit(MPTCP_DATA_READY, &msk->flags); | |
499 | } else if (!wait_data) { | |
500 | clear_bit(MPTCP_DATA_READY, &msk->flags); | |
cec37a6e | 501 | |
7a6a6cbc PA |
502 | /* .. race-breaker: ssk might get new data after last |
503 | * data_available() returns false. | |
504 | */ | |
505 | ssk = mptcp_subflow_recv_lookup(msk); | |
506 | if (unlikely(ssk)) | |
507 | set_bit(MPTCP_DATA_READY, &msk->flags); | |
508 | } | |
cec37a6e | 509 | |
7a6a6cbc | 510 | release_sock(sk); |
cec37a6e PK |
511 | return copied; |
512 | } | |
513 | ||
514 | /* subflow sockets can be either outgoing (connect) or incoming | |
515 | * (accept). | |
516 | * | |
517 | * Outgoing subflows use in-kernel sockets. | |
518 | * Incoming subflows do not have their own 'struct socket' allocated, | |
519 | * so we need to use tcp_close() after detaching them from the mptcp | |
520 | * parent socket. | |
521 | */ | |
522 | static void __mptcp_close_ssk(struct sock *sk, struct sock *ssk, | |
523 | struct mptcp_subflow_context *subflow, | |
524 | long timeout) | |
525 | { | |
526 | struct socket *sock = READ_ONCE(ssk->sk_socket); | |
527 | ||
528 | list_del(&subflow->node); | |
529 | ||
530 | if (sock && sock != sk->sk_socket) { | |
531 | /* outgoing subflow */ | |
532 | sock_release(sock); | |
533 | } else { | |
534 | /* incoming subflow */ | |
535 | tcp_close(ssk, timeout); | |
536 | } | |
f870fa0b MM |
537 | } |
538 | ||
784325e9 | 539 | static int __mptcp_init_sock(struct sock *sk) |
f870fa0b | 540 | { |
cec37a6e PK |
541 | struct mptcp_sock *msk = mptcp_sk(sk); |
542 | ||
543 | INIT_LIST_HEAD(&msk->conn_list); | |
1891c4a0 | 544 | __set_bit(MPTCP_SEND_SPACE, &msk->flags); |
cec37a6e | 545 | |
8ab183de PA |
546 | msk->first = NULL; |
547 | ||
f870fa0b MM |
548 | return 0; |
549 | } | |
550 | ||
784325e9 MB |
551 | static int mptcp_init_sock(struct sock *sk) |
552 | { | |
553 | if (!mptcp_is_enabled(sock_net(sk))) | |
554 | return -ENOPROTOOPT; | |
555 | ||
556 | return __mptcp_init_sock(sk); | |
557 | } | |
558 | ||
21498490 PK |
559 | static void mptcp_subflow_shutdown(struct sock *ssk, int how) |
560 | { | |
561 | lock_sock(ssk); | |
562 | ||
563 | switch (ssk->sk_state) { | |
564 | case TCP_LISTEN: | |
565 | if (!(how & RCV_SHUTDOWN)) | |
566 | break; | |
567 | /* fall through */ | |
568 | case TCP_SYN_SENT: | |
569 | tcp_disconnect(ssk, O_NONBLOCK); | |
570 | break; | |
571 | default: | |
572 | ssk->sk_shutdown |= how; | |
573 | tcp_shutdown(ssk, how); | |
574 | break; | |
575 | } | |
576 | ||
577 | /* Wake up anyone sleeping in poll. */ | |
578 | ssk->sk_state_change(ssk); | |
579 | release_sock(ssk); | |
580 | } | |
581 | ||
8ab183de | 582 | /* Called with msk lock held, releases such lock before returning */ |
2c22c06c | 583 | static void mptcp_close(struct sock *sk, long timeout) |
f870fa0b | 584 | { |
cec37a6e | 585 | struct mptcp_subflow_context *subflow, *tmp; |
f870fa0b | 586 | struct mptcp_sock *msk = mptcp_sk(sk); |
b2c5b614 | 587 | LIST_HEAD(conn_list); |
f870fa0b | 588 | |
2c22c06c FW |
589 | lock_sock(sk); |
590 | ||
79c0949e | 591 | mptcp_token_destroy(msk->token); |
f870fa0b MM |
592 | inet_sk_state_store(sk, TCP_CLOSE); |
593 | ||
b2c5b614 FW |
594 | list_splice_init(&msk->conn_list, &conn_list); |
595 | ||
596 | release_sock(sk); | |
597 | ||
598 | list_for_each_entry_safe(subflow, tmp, &conn_list, node) { | |
cec37a6e PK |
599 | struct sock *ssk = mptcp_subflow_tcp_sock(subflow); |
600 | ||
601 | __mptcp_close_ssk(sk, ssk, subflow, timeout); | |
f870fa0b MM |
602 | } |
603 | ||
cec37a6e | 604 | sk_common_release(sk); |
f870fa0b MM |
605 | } |
606 | ||
cf7da0d6 PK |
607 | static void mptcp_copy_inaddrs(struct sock *msk, const struct sock *ssk) |
608 | { | |
609 | #if IS_ENABLED(CONFIG_MPTCP_IPV6) | |
610 | const struct ipv6_pinfo *ssk6 = inet6_sk(ssk); | |
611 | struct ipv6_pinfo *msk6 = inet6_sk(msk); | |
612 | ||
613 | msk->sk_v6_daddr = ssk->sk_v6_daddr; | |
614 | msk->sk_v6_rcv_saddr = ssk->sk_v6_rcv_saddr; | |
615 | ||
616 | if (msk6 && ssk6) { | |
617 | msk6->saddr = ssk6->saddr; | |
618 | msk6->flow_label = ssk6->flow_label; | |
619 | } | |
620 | #endif | |
621 | ||
622 | inet_sk(msk)->inet_num = inet_sk(ssk)->inet_num; | |
623 | inet_sk(msk)->inet_dport = inet_sk(ssk)->inet_dport; | |
624 | inet_sk(msk)->inet_sport = inet_sk(ssk)->inet_sport; | |
625 | inet_sk(msk)->inet_daddr = inet_sk(ssk)->inet_daddr; | |
626 | inet_sk(msk)->inet_saddr = inet_sk(ssk)->inet_saddr; | |
627 | inet_sk(msk)->inet_rcv_saddr = inet_sk(ssk)->inet_rcv_saddr; | |
628 | } | |
629 | ||
630 | static struct sock *mptcp_accept(struct sock *sk, int flags, int *err, | |
631 | bool kern) | |
632 | { | |
633 | struct mptcp_sock *msk = mptcp_sk(sk); | |
634 | struct socket *listener; | |
635 | struct sock *newsk; | |
636 | ||
637 | listener = __mptcp_nmpc_socket(msk); | |
638 | if (WARN_ON_ONCE(!listener)) { | |
639 | *err = -EINVAL; | |
640 | return NULL; | |
641 | } | |
642 | ||
643 | pr_debug("msk=%p, listener=%p", msk, mptcp_subflow_ctx(listener->sk)); | |
644 | newsk = inet_csk_accept(listener->sk, flags, err, kern); | |
645 | if (!newsk) | |
646 | return NULL; | |
647 | ||
648 | pr_debug("msk=%p, subflow is mptcp=%d", msk, sk_is_mptcp(newsk)); | |
649 | ||
650 | if (sk_is_mptcp(newsk)) { | |
651 | struct mptcp_subflow_context *subflow; | |
652 | struct sock *new_mptcp_sock; | |
653 | struct sock *ssk = newsk; | |
6d0060f6 | 654 | u64 ack_seq; |
cf7da0d6 PK |
655 | |
656 | subflow = mptcp_subflow_ctx(newsk); | |
657 | lock_sock(sk); | |
658 | ||
659 | local_bh_disable(); | |
660 | new_mptcp_sock = sk_clone_lock(sk, GFP_ATOMIC); | |
661 | if (!new_mptcp_sock) { | |
662 | *err = -ENOBUFS; | |
663 | local_bh_enable(); | |
664 | release_sock(sk); | |
21498490 | 665 | mptcp_subflow_shutdown(newsk, SHUT_RDWR + 1); |
cf7da0d6 PK |
666 | tcp_close(newsk, 0); |
667 | return NULL; | |
668 | } | |
669 | ||
784325e9 | 670 | __mptcp_init_sock(new_mptcp_sock); |
cf7da0d6 PK |
671 | |
672 | msk = mptcp_sk(new_mptcp_sock); | |
cf7da0d6 | 673 | msk->local_key = subflow->local_key; |
79c0949e | 674 | msk->token = subflow->token; |
cf7da0d6 | 675 | msk->subflow = NULL; |
8ab183de | 676 | msk->first = newsk; |
cf7da0d6 | 677 | |
79c0949e | 678 | mptcp_token_update_accept(newsk, new_mptcp_sock); |
6d0060f6 | 679 | |
6d0060f6 | 680 | msk->write_seq = subflow->idsn + 1; |
d22f4988 CP |
681 | if (subflow->can_ack) { |
682 | msk->can_ack = true; | |
683 | msk->remote_key = subflow->remote_key; | |
684 | mptcp_crypto_key_sha(msk->remote_key, NULL, &ack_seq); | |
685 | ack_seq++; | |
686 | msk->ack_seq = ack_seq; | |
687 | } | |
cf7da0d6 PK |
688 | newsk = new_mptcp_sock; |
689 | mptcp_copy_inaddrs(newsk, ssk); | |
690 | list_add(&subflow->node, &msk->conn_list); | |
691 | ||
692 | /* will be fully established at mptcp_stream_accept() | |
693 | * completion. | |
694 | */ | |
695 | inet_sk_state_store(new_mptcp_sock, TCP_SYN_RECV); | |
696 | bh_unlock_sock(new_mptcp_sock); | |
697 | local_bh_enable(); | |
698 | release_sock(sk); | |
7a6a6cbc PA |
699 | |
700 | /* the subflow can already receive packet, avoid racing with | |
701 | * the receive path and process the pending ones | |
702 | */ | |
703 | lock_sock(ssk); | |
7a6a6cbc PA |
704 | subflow->rel_write_seq = 1; |
705 | subflow->tcp_sock = ssk; | |
706 | subflow->conn = new_mptcp_sock; | |
707 | if (unlikely(!skb_queue_empty(&ssk->sk_receive_queue))) | |
708 | mptcp_subflow_data_available(ssk); | |
709 | release_sock(ssk); | |
cf7da0d6 PK |
710 | } |
711 | ||
712 | return newsk; | |
713 | } | |
714 | ||
79c0949e PK |
715 | static void mptcp_destroy(struct sock *sk) |
716 | { | |
c9fd9c5f FW |
717 | struct mptcp_sock *msk = mptcp_sk(sk); |
718 | ||
719 | if (msk->cached_ext) | |
720 | __skb_ext_put(msk->cached_ext); | |
79c0949e PK |
721 | } |
722 | ||
717e79c8 | 723 | static int mptcp_setsockopt(struct sock *sk, int level, int optname, |
50e741bb | 724 | char __user *optval, unsigned int optlen) |
717e79c8 PK |
725 | { |
726 | struct mptcp_sock *msk = mptcp_sk(sk); | |
717e79c8 PK |
727 | int ret = -EOPNOTSUPP; |
728 | struct socket *ssock; | |
50e741bb | 729 | struct sock *ssk; |
717e79c8 PK |
730 | |
731 | pr_debug("msk=%p", msk); | |
732 | ||
733 | /* @@ the meaning of setsockopt() when the socket is connected and | |
734 | * there are multiple subflows is not defined. | |
735 | */ | |
736 | lock_sock(sk); | |
737 | ssock = __mptcp_socket_create(msk, MPTCP_SAME_STATE); | |
50e741bb FW |
738 | if (IS_ERR(ssock)) { |
739 | release_sock(sk); | |
740 | return ret; | |
717e79c8 | 741 | } |
50e741bb FW |
742 | |
743 | ssk = ssock->sk; | |
744 | sock_hold(ssk); | |
717e79c8 PK |
745 | release_sock(sk); |
746 | ||
50e741bb FW |
747 | ret = tcp_setsockopt(ssk, level, optname, optval, optlen); |
748 | sock_put(ssk); | |
749 | ||
717e79c8 PK |
750 | return ret; |
751 | } | |
752 | ||
753 | static int mptcp_getsockopt(struct sock *sk, int level, int optname, | |
50e741bb | 754 | char __user *optval, int __user *option) |
717e79c8 PK |
755 | { |
756 | struct mptcp_sock *msk = mptcp_sk(sk); | |
717e79c8 | 757 | int ret = -EOPNOTSUPP; |
717e79c8 | 758 | struct socket *ssock; |
50e741bb | 759 | struct sock *ssk; |
717e79c8 PK |
760 | |
761 | pr_debug("msk=%p", msk); | |
762 | ||
763 | /* @@ the meaning of getsockopt() when the socket is connected and | |
764 | * there are multiple subflows is not defined. | |
765 | */ | |
766 | lock_sock(sk); | |
767 | ssock = __mptcp_socket_create(msk, MPTCP_SAME_STATE); | |
50e741bb FW |
768 | if (IS_ERR(ssock)) { |
769 | release_sock(sk); | |
770 | return ret; | |
717e79c8 | 771 | } |
50e741bb FW |
772 | |
773 | ssk = ssock->sk; | |
774 | sock_hold(ssk); | |
717e79c8 PK |
775 | release_sock(sk); |
776 | ||
50e741bb FW |
777 | ret = tcp_getsockopt(ssk, level, optname, optval, option); |
778 | sock_put(ssk); | |
779 | ||
717e79c8 PK |
780 | return ret; |
781 | } | |
782 | ||
cec37a6e | 783 | static int mptcp_get_port(struct sock *sk, unsigned short snum) |
f870fa0b MM |
784 | { |
785 | struct mptcp_sock *msk = mptcp_sk(sk); | |
cec37a6e | 786 | struct socket *ssock; |
f870fa0b | 787 | |
cec37a6e PK |
788 | ssock = __mptcp_nmpc_socket(msk); |
789 | pr_debug("msk=%p, subflow=%p", msk, ssock); | |
790 | if (WARN_ON_ONCE(!ssock)) | |
791 | return -EINVAL; | |
f870fa0b | 792 | |
cec37a6e PK |
793 | return inet_csk_get_port(ssock->sk, snum); |
794 | } | |
f870fa0b | 795 | |
cec37a6e PK |
796 | void mptcp_finish_connect(struct sock *ssk) |
797 | { | |
798 | struct mptcp_subflow_context *subflow; | |
799 | struct mptcp_sock *msk; | |
800 | struct sock *sk; | |
6d0060f6 | 801 | u64 ack_seq; |
f870fa0b | 802 | |
cec37a6e | 803 | subflow = mptcp_subflow_ctx(ssk); |
f870fa0b | 804 | |
cec37a6e PK |
805 | if (!subflow->mp_capable) |
806 | return; | |
807 | ||
808 | sk = subflow->conn; | |
809 | msk = mptcp_sk(sk); | |
810 | ||
648ef4b8 MM |
811 | pr_debug("msk=%p, token=%u", sk, subflow->token); |
812 | ||
6d0060f6 MM |
813 | mptcp_crypto_key_sha(subflow->remote_key, NULL, &ack_seq); |
814 | ack_seq++; | |
648ef4b8 MM |
815 | subflow->map_seq = ack_seq; |
816 | subflow->map_subflow_seq = 1; | |
6d0060f6 MM |
817 | subflow->rel_write_seq = 1; |
818 | ||
cec37a6e PK |
819 | /* the socket is not connected yet, no msk/subflow ops can access/race |
820 | * accessing the field below | |
821 | */ | |
822 | WRITE_ONCE(msk->remote_key, subflow->remote_key); | |
823 | WRITE_ONCE(msk->local_key, subflow->local_key); | |
79c0949e | 824 | WRITE_ONCE(msk->token, subflow->token); |
6d0060f6 MM |
825 | WRITE_ONCE(msk->write_seq, subflow->idsn + 1); |
826 | WRITE_ONCE(msk->ack_seq, ack_seq); | |
d22f4988 | 827 | WRITE_ONCE(msk->can_ack, 1); |
f870fa0b MM |
828 | } |
829 | ||
cf7da0d6 PK |
830 | static void mptcp_sock_graft(struct sock *sk, struct socket *parent) |
831 | { | |
832 | write_lock_bh(&sk->sk_callback_lock); | |
833 | rcu_assign_pointer(sk->sk_wq, &parent->wq); | |
834 | sk_set_socket(sk, parent); | |
835 | sk->sk_uid = SOCK_INODE(parent)->i_uid; | |
836 | write_unlock_bh(&sk->sk_callback_lock); | |
837 | } | |
838 | ||
1891c4a0 FW |
839 | static bool mptcp_memory_free(const struct sock *sk, int wake) |
840 | { | |
841 | struct mptcp_sock *msk = mptcp_sk(sk); | |
842 | ||
843 | return wake ? test_bit(MPTCP_SEND_SPACE, &msk->flags) : true; | |
844 | } | |
845 | ||
f870fa0b MM |
846 | static struct proto mptcp_prot = { |
847 | .name = "MPTCP", | |
848 | .owner = THIS_MODULE, | |
849 | .init = mptcp_init_sock, | |
850 | .close = mptcp_close, | |
cf7da0d6 | 851 | .accept = mptcp_accept, |
717e79c8 PK |
852 | .setsockopt = mptcp_setsockopt, |
853 | .getsockopt = mptcp_getsockopt, | |
f870fa0b | 854 | .shutdown = tcp_shutdown, |
79c0949e | 855 | .destroy = mptcp_destroy, |
f870fa0b MM |
856 | .sendmsg = mptcp_sendmsg, |
857 | .recvmsg = mptcp_recvmsg, | |
858 | .hash = inet_hash, | |
859 | .unhash = inet_unhash, | |
cec37a6e | 860 | .get_port = mptcp_get_port, |
1891c4a0 | 861 | .stream_memory_free = mptcp_memory_free, |
f870fa0b MM |
862 | .obj_size = sizeof(struct mptcp_sock), |
863 | .no_autobind = true, | |
864 | }; | |
865 | ||
2303f994 PK |
866 | static int mptcp_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) |
867 | { | |
868 | struct mptcp_sock *msk = mptcp_sk(sock->sk); | |
869 | struct socket *ssock; | |
cf7da0d6 | 870 | int err; |
2303f994 PK |
871 | |
872 | lock_sock(sock->sk); | |
873 | ssock = __mptcp_socket_create(msk, MPTCP_SAME_STATE); | |
874 | if (IS_ERR(ssock)) { | |
875 | err = PTR_ERR(ssock); | |
876 | goto unlock; | |
877 | } | |
878 | ||
879 | err = ssock->ops->bind(ssock, uaddr, addr_len); | |
cf7da0d6 PK |
880 | if (!err) |
881 | mptcp_copy_inaddrs(sock->sk, ssock->sk); | |
2303f994 PK |
882 | |
883 | unlock: | |
884 | release_sock(sock->sk); | |
885 | return err; | |
886 | } | |
887 | ||
888 | static int mptcp_stream_connect(struct socket *sock, struct sockaddr *uaddr, | |
889 | int addr_len, int flags) | |
890 | { | |
891 | struct mptcp_sock *msk = mptcp_sk(sock->sk); | |
892 | struct socket *ssock; | |
893 | int err; | |
894 | ||
895 | lock_sock(sock->sk); | |
896 | ssock = __mptcp_socket_create(msk, TCP_SYN_SENT); | |
897 | if (IS_ERR(ssock)) { | |
898 | err = PTR_ERR(ssock); | |
899 | goto unlock; | |
900 | } | |
901 | ||
cf7da0d6 PK |
902 | #ifdef CONFIG_TCP_MD5SIG |
903 | /* no MPTCP if MD5SIG is enabled on this socket or we may run out of | |
904 | * TCP option space. | |
905 | */ | |
906 | if (rcu_access_pointer(tcp_sk(ssock->sk)->md5sig_info)) | |
907 | mptcp_subflow_ctx(ssock->sk)->request_mptcp = 0; | |
908 | #endif | |
909 | ||
2303f994 PK |
910 | err = ssock->ops->connect(ssock, uaddr, addr_len, flags); |
911 | inet_sk_state_store(sock->sk, inet_sk_state_load(ssock->sk)); | |
cf7da0d6 | 912 | mptcp_copy_inaddrs(sock->sk, ssock->sk); |
2303f994 PK |
913 | |
914 | unlock: | |
915 | release_sock(sock->sk); | |
916 | return err; | |
917 | } | |
918 | ||
cf7da0d6 PK |
919 | static int mptcp_v4_getname(struct socket *sock, struct sockaddr *uaddr, |
920 | int peer) | |
921 | { | |
922 | if (sock->sk->sk_prot == &tcp_prot) { | |
923 | /* we are being invoked from __sys_accept4, after | |
924 | * mptcp_accept() has just accepted a non-mp-capable | |
925 | * flow: sk is a tcp_sk, not an mptcp one. | |
926 | * | |
927 | * Hand the socket over to tcp so all further socket ops | |
928 | * bypass mptcp. | |
929 | */ | |
930 | sock->ops = &inet_stream_ops; | |
931 | } | |
932 | ||
933 | return inet_getname(sock, uaddr, peer); | |
934 | } | |
935 | ||
936 | #if IS_ENABLED(CONFIG_MPTCP_IPV6) | |
937 | static int mptcp_v6_getname(struct socket *sock, struct sockaddr *uaddr, | |
938 | int peer) | |
939 | { | |
940 | if (sock->sk->sk_prot == &tcpv6_prot) { | |
941 | /* we are being invoked from __sys_accept4 after | |
942 | * mptcp_accept() has accepted a non-mp-capable | |
943 | * subflow: sk is a tcp_sk, not mptcp. | |
944 | * | |
945 | * Hand the socket over to tcp so all further | |
946 | * socket ops bypass mptcp. | |
947 | */ | |
948 | sock->ops = &inet6_stream_ops; | |
949 | } | |
950 | ||
951 | return inet6_getname(sock, uaddr, peer); | |
952 | } | |
953 | #endif | |
954 | ||
955 | static int mptcp_listen(struct socket *sock, int backlog) | |
956 | { | |
957 | struct mptcp_sock *msk = mptcp_sk(sock->sk); | |
958 | struct socket *ssock; | |
959 | int err; | |
960 | ||
961 | pr_debug("msk=%p", msk); | |
962 | ||
963 | lock_sock(sock->sk); | |
964 | ssock = __mptcp_socket_create(msk, TCP_LISTEN); | |
965 | if (IS_ERR(ssock)) { | |
966 | err = PTR_ERR(ssock); | |
967 | goto unlock; | |
968 | } | |
969 | ||
970 | err = ssock->ops->listen(ssock, backlog); | |
971 | inet_sk_state_store(sock->sk, inet_sk_state_load(ssock->sk)); | |
972 | if (!err) | |
973 | mptcp_copy_inaddrs(sock->sk, ssock->sk); | |
974 | ||
975 | unlock: | |
976 | release_sock(sock->sk); | |
977 | return err; | |
978 | } | |
979 | ||
980 | static bool is_tcp_proto(const struct proto *p) | |
981 | { | |
982 | #if IS_ENABLED(CONFIG_MPTCP_IPV6) | |
983 | return p == &tcp_prot || p == &tcpv6_prot; | |
984 | #else | |
985 | return p == &tcp_prot; | |
986 | #endif | |
987 | } | |
988 | ||
989 | static int mptcp_stream_accept(struct socket *sock, struct socket *newsock, | |
990 | int flags, bool kern) | |
991 | { | |
992 | struct mptcp_sock *msk = mptcp_sk(sock->sk); | |
993 | struct socket *ssock; | |
994 | int err; | |
995 | ||
996 | pr_debug("msk=%p", msk); | |
997 | ||
998 | lock_sock(sock->sk); | |
999 | if (sock->sk->sk_state != TCP_LISTEN) | |
1000 | goto unlock_fail; | |
1001 | ||
1002 | ssock = __mptcp_nmpc_socket(msk); | |
1003 | if (!ssock) | |
1004 | goto unlock_fail; | |
1005 | ||
1006 | sock_hold(ssock->sk); | |
1007 | release_sock(sock->sk); | |
1008 | ||
1009 | err = ssock->ops->accept(sock, newsock, flags, kern); | |
1010 | if (err == 0 && !is_tcp_proto(newsock->sk->sk_prot)) { | |
1011 | struct mptcp_sock *msk = mptcp_sk(newsock->sk); | |
1012 | struct mptcp_subflow_context *subflow; | |
1013 | ||
1014 | /* set ssk->sk_socket of accept()ed flows to mptcp socket. | |
1015 | * This is needed so NOSPACE flag can be set from tcp stack. | |
1016 | */ | |
1017 | list_for_each_entry(subflow, &msk->conn_list, node) { | |
1018 | struct sock *ssk = mptcp_subflow_tcp_sock(subflow); | |
1019 | ||
1020 | if (!ssk->sk_socket) | |
1021 | mptcp_sock_graft(ssk, newsock); | |
1022 | } | |
1023 | ||
1024 | inet_sk_state_store(newsock->sk, TCP_ESTABLISHED); | |
1025 | } | |
1026 | ||
1027 | sock_put(ssock->sk); | |
1028 | return err; | |
1029 | ||
1030 | unlock_fail: | |
1031 | release_sock(sock->sk); | |
1032 | return -EINVAL; | |
1033 | } | |
1034 | ||
2303f994 PK |
1035 | static __poll_t mptcp_poll(struct file *file, struct socket *sock, |
1036 | struct poll_table_struct *wait) | |
1037 | { | |
1891c4a0 | 1038 | struct sock *sk = sock->sk; |
8ab183de | 1039 | struct mptcp_sock *msk; |
1891c4a0 | 1040 | struct socket *ssock; |
2303f994 PK |
1041 | __poll_t mask = 0; |
1042 | ||
1891c4a0 FW |
1043 | msk = mptcp_sk(sk); |
1044 | lock_sock(sk); | |
1045 | ssock = __mptcp_nmpc_socket(msk); | |
1046 | if (ssock) { | |
1047 | mask = ssock->ops->poll(file, ssock, wait); | |
1048 | release_sock(sk); | |
1049 | return mask; | |
1050 | } | |
1051 | ||
1052 | release_sock(sk); | |
1053 | sock_poll_wait(file, sock, wait); | |
1054 | lock_sock(sk); | |
8ab183de PA |
1055 | ssock = __mptcp_tcp_fallback(msk); |
1056 | if (unlikely(ssock)) | |
1057 | return ssock->ops->poll(file, ssock, NULL); | |
1891c4a0 FW |
1058 | |
1059 | if (test_bit(MPTCP_DATA_READY, &msk->flags)) | |
1060 | mask = EPOLLIN | EPOLLRDNORM; | |
1061 | if (sk_stream_is_writeable(sk) && | |
1062 | test_bit(MPTCP_SEND_SPACE, &msk->flags)) | |
1063 | mask |= EPOLLOUT | EPOLLWRNORM; | |
1064 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
1065 | mask |= EPOLLIN | EPOLLRDNORM | EPOLLRDHUP; | |
1066 | ||
1067 | release_sock(sk); | |
1068 | ||
2303f994 PK |
1069 | return mask; |
1070 | } | |
1071 | ||
21498490 PK |
1072 | static int mptcp_shutdown(struct socket *sock, int how) |
1073 | { | |
1074 | struct mptcp_sock *msk = mptcp_sk(sock->sk); | |
1075 | struct mptcp_subflow_context *subflow; | |
1076 | int ret = 0; | |
1077 | ||
1078 | pr_debug("sk=%p, how=%d", msk, how); | |
1079 | ||
1080 | lock_sock(sock->sk); | |
1081 | ||
1082 | if (how == SHUT_WR || how == SHUT_RDWR) | |
1083 | inet_sk_state_store(sock->sk, TCP_FIN_WAIT1); | |
1084 | ||
1085 | how++; | |
1086 | ||
1087 | if ((how & ~SHUTDOWN_MASK) || !how) { | |
1088 | ret = -EINVAL; | |
1089 | goto out_unlock; | |
1090 | } | |
1091 | ||
1092 | if (sock->state == SS_CONNECTING) { | |
1093 | if ((1 << sock->sk->sk_state) & | |
1094 | (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE)) | |
1095 | sock->state = SS_DISCONNECTING; | |
1096 | else | |
1097 | sock->state = SS_CONNECTED; | |
1098 | } | |
1099 | ||
1100 | mptcp_for_each_subflow(msk, subflow) { | |
1101 | struct sock *tcp_sk = mptcp_subflow_tcp_sock(subflow); | |
1102 | ||
1103 | mptcp_subflow_shutdown(tcp_sk, how); | |
1104 | } | |
1105 | ||
1106 | out_unlock: | |
1107 | release_sock(sock->sk); | |
1108 | ||
1109 | return ret; | |
1110 | } | |
1111 | ||
e42f1ac6 FW |
1112 | static const struct proto_ops mptcp_stream_ops = { |
1113 | .family = PF_INET, | |
1114 | .owner = THIS_MODULE, | |
1115 | .release = inet_release, | |
1116 | .bind = mptcp_bind, | |
1117 | .connect = mptcp_stream_connect, | |
1118 | .socketpair = sock_no_socketpair, | |
1119 | .accept = mptcp_stream_accept, | |
1120 | .getname = mptcp_v4_getname, | |
1121 | .poll = mptcp_poll, | |
1122 | .ioctl = inet_ioctl, | |
1123 | .gettstamp = sock_gettstamp, | |
1124 | .listen = mptcp_listen, | |
1125 | .shutdown = mptcp_shutdown, | |
1126 | .setsockopt = sock_common_setsockopt, | |
1127 | .getsockopt = sock_common_getsockopt, | |
1128 | .sendmsg = inet_sendmsg, | |
1129 | .recvmsg = inet_recvmsg, | |
1130 | .mmap = sock_no_mmap, | |
1131 | .sendpage = inet_sendpage, | |
1132 | #ifdef CONFIG_COMPAT | |
1133 | .compat_setsockopt = compat_sock_common_setsockopt, | |
1134 | .compat_getsockopt = compat_sock_common_getsockopt, | |
1135 | #endif | |
1136 | }; | |
2303f994 | 1137 | |
f870fa0b MM |
1138 | static struct inet_protosw mptcp_protosw = { |
1139 | .type = SOCK_STREAM, | |
1140 | .protocol = IPPROTO_MPTCP, | |
1141 | .prot = &mptcp_prot, | |
2303f994 PK |
1142 | .ops = &mptcp_stream_ops, |
1143 | .flags = INET_PROTOSW_ICSK, | |
f870fa0b MM |
1144 | }; |
1145 | ||
784325e9 | 1146 | void mptcp_proto_init(void) |
f870fa0b | 1147 | { |
2303f994 | 1148 | mptcp_prot.h.hashinfo = tcp_prot.h.hashinfo; |
2303f994 PK |
1149 | |
1150 | mptcp_subflow_init(); | |
1151 | ||
f870fa0b MM |
1152 | if (proto_register(&mptcp_prot, 1) != 0) |
1153 | panic("Failed to register MPTCP proto.\n"); | |
1154 | ||
1155 | inet_register_protosw(&mptcp_protosw); | |
1156 | } | |
1157 | ||
1158 | #if IS_ENABLED(CONFIG_MPTCP_IPV6) | |
e42f1ac6 FW |
1159 | static const struct proto_ops mptcp_v6_stream_ops = { |
1160 | .family = PF_INET6, | |
1161 | .owner = THIS_MODULE, | |
1162 | .release = inet6_release, | |
1163 | .bind = mptcp_bind, | |
1164 | .connect = mptcp_stream_connect, | |
1165 | .socketpair = sock_no_socketpair, | |
1166 | .accept = mptcp_stream_accept, | |
1167 | .getname = mptcp_v6_getname, | |
1168 | .poll = mptcp_poll, | |
1169 | .ioctl = inet6_ioctl, | |
1170 | .gettstamp = sock_gettstamp, | |
1171 | .listen = mptcp_listen, | |
1172 | .shutdown = mptcp_shutdown, | |
1173 | .setsockopt = sock_common_setsockopt, | |
1174 | .getsockopt = sock_common_getsockopt, | |
1175 | .sendmsg = inet6_sendmsg, | |
1176 | .recvmsg = inet6_recvmsg, | |
1177 | .mmap = sock_no_mmap, | |
1178 | .sendpage = inet_sendpage, | |
1179 | #ifdef CONFIG_COMPAT | |
1180 | .compat_setsockopt = compat_sock_common_setsockopt, | |
1181 | .compat_getsockopt = compat_sock_common_getsockopt, | |
1182 | #endif | |
1183 | }; | |
1184 | ||
f870fa0b MM |
1185 | static struct proto mptcp_v6_prot; |
1186 | ||
79c0949e PK |
1187 | static void mptcp_v6_destroy(struct sock *sk) |
1188 | { | |
1189 | mptcp_destroy(sk); | |
1190 | inet6_destroy_sock(sk); | |
1191 | } | |
1192 | ||
f870fa0b MM |
1193 | static struct inet_protosw mptcp_v6_protosw = { |
1194 | .type = SOCK_STREAM, | |
1195 | .protocol = IPPROTO_MPTCP, | |
1196 | .prot = &mptcp_v6_prot, | |
2303f994 | 1197 | .ops = &mptcp_v6_stream_ops, |
f870fa0b MM |
1198 | .flags = INET_PROTOSW_ICSK, |
1199 | }; | |
1200 | ||
784325e9 | 1201 | int mptcp_proto_v6_init(void) |
f870fa0b MM |
1202 | { |
1203 | int err; | |
1204 | ||
1205 | mptcp_v6_prot = mptcp_prot; | |
1206 | strcpy(mptcp_v6_prot.name, "MPTCPv6"); | |
1207 | mptcp_v6_prot.slab = NULL; | |
79c0949e | 1208 | mptcp_v6_prot.destroy = mptcp_v6_destroy; |
f870fa0b MM |
1209 | mptcp_v6_prot.obj_size = sizeof(struct mptcp_sock) + |
1210 | sizeof(struct ipv6_pinfo); | |
1211 | ||
1212 | err = proto_register(&mptcp_v6_prot, 1); | |
1213 | if (err) | |
1214 | return err; | |
1215 | ||
1216 | err = inet6_register_protosw(&mptcp_v6_protosw); | |
1217 | if (err) | |
1218 | proto_unregister(&mptcp_v6_prot); | |
1219 | ||
1220 | return err; | |
1221 | } | |
1222 | #endif |