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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> | |
3721b9b6 | 19 | #include <net/tcp_states.h> |
cf7da0d6 PK |
20 | #if IS_ENABLED(CONFIG_MPTCP_IPV6) |
21 | #include <net/transp_v6.h> | |
22 | #endif | |
f870fa0b | 23 | #include <net/mptcp.h> |
e16163b6 | 24 | #include <net/xfrm.h> |
f870fa0b | 25 | #include "protocol.h" |
fc518953 | 26 | #include "mib.h" |
f870fa0b | 27 | |
b0519de8 FW |
28 | #if IS_ENABLED(CONFIG_MPTCP_IPV6) |
29 | struct mptcp6_sock { | |
30 | struct mptcp_sock msk; | |
31 | struct ipv6_pinfo np; | |
32 | }; | |
33 | #endif | |
34 | ||
6771bfd9 | 35 | struct mptcp_skb_cb { |
ab174ad8 PA |
36 | u64 map_seq; |
37 | u64 end_seq; | |
6771bfd9 FW |
38 | u32 offset; |
39 | }; | |
40 | ||
41 | #define MPTCP_SKB_CB(__skb) ((struct mptcp_skb_cb *)&((__skb)->cb[0])) | |
42 | ||
d027236c PA |
43 | static struct percpu_counter mptcp_sockets_allocated; |
44 | ||
e16163b6 | 45 | static void __mptcp_destroy_sock(struct sock *sk); |
d9ca1de8 | 46 | static void __mptcp_check_send_data_fin(struct sock *sk); |
e16163b6 | 47 | |
2303f994 PK |
48 | /* If msk has an initial subflow socket, and the MP_CAPABLE handshake has not |
49 | * completed yet or has failed, return the subflow socket. | |
50 | * Otherwise return NULL. | |
51 | */ | |
52 | static struct socket *__mptcp_nmpc_socket(const struct mptcp_sock *msk) | |
53 | { | |
d22f4988 | 54 | if (!msk->subflow || READ_ONCE(msk->can_ack)) |
2303f994 PK |
55 | return NULL; |
56 | ||
57 | return msk->subflow; | |
58 | } | |
59 | ||
6f8a612a FW |
60 | /* Returns end sequence number of the receiver's advertised window */ |
61 | static u64 mptcp_wnd_end(const struct mptcp_sock *msk) | |
62 | { | |
63 | return atomic64_read(&msk->wnd_end); | |
64 | } | |
65 | ||
d2f77c53 | 66 | static bool mptcp_is_tcpsk(struct sock *sk) |
0b4f33de FW |
67 | { |
68 | struct socket *sock = sk->sk_socket; | |
69 | ||
0b4f33de FW |
70 | if (unlikely(sk->sk_prot == &tcp_prot)) { |
71 | /* we are being invoked after mptcp_accept() has | |
72 | * accepted a non-mp-capable flow: sk is a tcp_sk, | |
73 | * not an mptcp one. | |
74 | * | |
75 | * Hand the socket over to tcp so all further socket ops | |
76 | * bypass mptcp. | |
77 | */ | |
78 | sock->ops = &inet_stream_ops; | |
d2f77c53 | 79 | return true; |
0b4f33de FW |
80 | #if IS_ENABLED(CONFIG_MPTCP_IPV6) |
81 | } else if (unlikely(sk->sk_prot == &tcpv6_prot)) { | |
82 | sock->ops = &inet6_stream_ops; | |
d2f77c53 | 83 | return true; |
0b4f33de FW |
84 | #endif |
85 | } | |
86 | ||
d2f77c53 | 87 | return false; |
0b4f33de FW |
88 | } |
89 | ||
76660afb | 90 | static struct sock *__mptcp_tcp_fallback(struct mptcp_sock *msk) |
cec37a6e | 91 | { |
cec37a6e PK |
92 | sock_owned_by_me((const struct sock *)msk); |
93 | ||
e1ff9e82 | 94 | if (likely(!__mptcp_check_fallback(msk))) |
cec37a6e PK |
95 | return NULL; |
96 | ||
76660afb | 97 | return msk->first; |
cec37a6e PK |
98 | } |
99 | ||
fa68018d | 100 | static int __mptcp_socket_create(struct mptcp_sock *msk) |
2303f994 PK |
101 | { |
102 | struct mptcp_subflow_context *subflow; | |
103 | struct sock *sk = (struct sock *)msk; | |
104 | struct socket *ssock; | |
105 | int err; | |
106 | ||
2303f994 PK |
107 | err = mptcp_subflow_create_socket(sk, &ssock); |
108 | if (err) | |
fa68018d | 109 | return err; |
2303f994 | 110 | |
8ab183de | 111 | msk->first = ssock->sk; |
2303f994 PK |
112 | msk->subflow = ssock; |
113 | subflow = mptcp_subflow_ctx(ssock->sk); | |
cec37a6e | 114 | list_add(&subflow->node, &msk->conn_list); |
e16163b6 | 115 | sock_hold(ssock->sk); |
2303f994 PK |
116 | subflow->request_mptcp = 1; |
117 | ||
e1ff9e82 DC |
118 | /* accept() will wait on first subflow sk_wq, and we always wakes up |
119 | * via msk->sk_socket | |
120 | */ | |
121 | RCU_INIT_POINTER(msk->first->sk_wq, &sk->sk_socket->wq); | |
122 | ||
fa68018d | 123 | return 0; |
2303f994 PK |
124 | } |
125 | ||
ab174ad8 PA |
126 | static void mptcp_drop(struct sock *sk, struct sk_buff *skb) |
127 | { | |
128 | sk_drops_add(sk, skb); | |
129 | __kfree_skb(skb); | |
130 | } | |
131 | ||
8268ed4c PA |
132 | static bool mptcp_try_coalesce(struct sock *sk, struct sk_buff *to, |
133 | struct sk_buff *from) | |
134 | { | |
135 | bool fragstolen; | |
136 | int delta; | |
137 | ||
138 | if (MPTCP_SKB_CB(from)->offset || | |
139 | !skb_try_coalesce(to, from, &fragstolen, &delta)) | |
140 | return false; | |
141 | ||
06242e44 PA |
142 | pr_debug("colesced seq %llx into %llx new len %d new end seq %llx", |
143 | MPTCP_SKB_CB(from)->map_seq, MPTCP_SKB_CB(to)->map_seq, | |
144 | to->len, MPTCP_SKB_CB(from)->end_seq); | |
ab174ad8 | 145 | MPTCP_SKB_CB(to)->end_seq = MPTCP_SKB_CB(from)->end_seq; |
8268ed4c PA |
146 | kfree_skb_partial(from, fragstolen); |
147 | atomic_add(delta, &sk->sk_rmem_alloc); | |
148 | sk_mem_charge(sk, delta); | |
149 | return true; | |
150 | } | |
151 | ||
ab174ad8 PA |
152 | static bool mptcp_ooo_try_coalesce(struct mptcp_sock *msk, struct sk_buff *to, |
153 | struct sk_buff *from) | |
154 | { | |
155 | if (MPTCP_SKB_CB(from)->map_seq != MPTCP_SKB_CB(to)->end_seq) | |
156 | return false; | |
157 | ||
158 | return mptcp_try_coalesce((struct sock *)msk, to, from); | |
159 | } | |
160 | ||
161 | /* "inspired" by tcp_data_queue_ofo(), main differences: | |
162 | * - use mptcp seqs | |
163 | * - don't cope with sacks | |
164 | */ | |
165 | static void mptcp_data_queue_ofo(struct mptcp_sock *msk, struct sk_buff *skb) | |
166 | { | |
167 | struct sock *sk = (struct sock *)msk; | |
168 | struct rb_node **p, *parent; | |
169 | u64 seq, end_seq, max_seq; | |
170 | struct sk_buff *skb1; | |
171 | ||
172 | seq = MPTCP_SKB_CB(skb)->map_seq; | |
173 | end_seq = MPTCP_SKB_CB(skb)->end_seq; | |
fa3fe2b1 | 174 | max_seq = READ_ONCE(msk->rcv_wnd_sent); |
ab174ad8 | 175 | |
06242e44 PA |
176 | pr_debug("msk=%p seq=%llx limit=%llx empty=%d", msk, seq, max_seq, |
177 | RB_EMPTY_ROOT(&msk->out_of_order_queue)); | |
fa3fe2b1 | 178 | if (after64(end_seq, max_seq)) { |
ab174ad8 PA |
179 | /* out of window */ |
180 | mptcp_drop(sk, skb); | |
fa3fe2b1 FW |
181 | pr_debug("oow by %lld, rcv_wnd_sent %llu\n", |
182 | (unsigned long long)end_seq - (unsigned long)max_seq, | |
183 | (unsigned long long)msk->rcv_wnd_sent); | |
06242e44 | 184 | MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_NODSSWINDOW); |
ab174ad8 PA |
185 | return; |
186 | } | |
187 | ||
188 | p = &msk->out_of_order_queue.rb_node; | |
06242e44 | 189 | MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_OFOQUEUE); |
ab174ad8 PA |
190 | if (RB_EMPTY_ROOT(&msk->out_of_order_queue)) { |
191 | rb_link_node(&skb->rbnode, NULL, p); | |
192 | rb_insert_color(&skb->rbnode, &msk->out_of_order_queue); | |
193 | msk->ooo_last_skb = skb; | |
194 | goto end; | |
195 | } | |
196 | ||
197 | /* with 2 subflows, adding at end of ooo queue is quite likely | |
198 | * Use of ooo_last_skb avoids the O(Log(N)) rbtree lookup. | |
199 | */ | |
06242e44 PA |
200 | if (mptcp_ooo_try_coalesce(msk, msk->ooo_last_skb, skb)) { |
201 | MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_OFOMERGE); | |
202 | MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_OFOQUEUETAIL); | |
ab174ad8 | 203 | return; |
06242e44 | 204 | } |
ab174ad8 PA |
205 | |
206 | /* Can avoid an rbtree lookup if we are adding skb after ooo_last_skb */ | |
207 | if (!before64(seq, MPTCP_SKB_CB(msk->ooo_last_skb)->end_seq)) { | |
06242e44 | 208 | MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_OFOQUEUETAIL); |
ab174ad8 PA |
209 | parent = &msk->ooo_last_skb->rbnode; |
210 | p = &parent->rb_right; | |
211 | goto insert; | |
212 | } | |
213 | ||
214 | /* Find place to insert this segment. Handle overlaps on the way. */ | |
215 | parent = NULL; | |
216 | while (*p) { | |
217 | parent = *p; | |
218 | skb1 = rb_to_skb(parent); | |
219 | if (before64(seq, MPTCP_SKB_CB(skb1)->map_seq)) { | |
220 | p = &parent->rb_left; | |
221 | continue; | |
222 | } | |
223 | if (before64(seq, MPTCP_SKB_CB(skb1)->end_seq)) { | |
224 | if (!after64(end_seq, MPTCP_SKB_CB(skb1)->end_seq)) { | |
225 | /* All the bits are present. Drop. */ | |
226 | mptcp_drop(sk, skb); | |
06242e44 | 227 | MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_DUPDATA); |
ab174ad8 PA |
228 | return; |
229 | } | |
230 | if (after64(seq, MPTCP_SKB_CB(skb1)->map_seq)) { | |
231 | /* partial overlap: | |
232 | * | skb | | |
233 | * | skb1 | | |
234 | * continue traversing | |
235 | */ | |
236 | } else { | |
237 | /* skb's seq == skb1's seq and skb covers skb1. | |
238 | * Replace skb1 with skb. | |
239 | */ | |
240 | rb_replace_node(&skb1->rbnode, &skb->rbnode, | |
241 | &msk->out_of_order_queue); | |
242 | mptcp_drop(sk, skb1); | |
06242e44 | 243 | MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_DUPDATA); |
ab174ad8 PA |
244 | goto merge_right; |
245 | } | |
246 | } else if (mptcp_ooo_try_coalesce(msk, skb1, skb)) { | |
06242e44 | 247 | MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_OFOMERGE); |
ab174ad8 PA |
248 | return; |
249 | } | |
250 | p = &parent->rb_right; | |
251 | } | |
06242e44 | 252 | |
ab174ad8 PA |
253 | insert: |
254 | /* Insert segment into RB tree. */ | |
255 | rb_link_node(&skb->rbnode, parent, p); | |
256 | rb_insert_color(&skb->rbnode, &msk->out_of_order_queue); | |
257 | ||
258 | merge_right: | |
259 | /* Remove other segments covered by skb. */ | |
260 | while ((skb1 = skb_rb_next(skb)) != NULL) { | |
261 | if (before64(end_seq, MPTCP_SKB_CB(skb1)->end_seq)) | |
262 | break; | |
263 | rb_erase(&skb1->rbnode, &msk->out_of_order_queue); | |
264 | mptcp_drop(sk, skb1); | |
06242e44 | 265 | MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_DUPDATA); |
ab174ad8 PA |
266 | } |
267 | /* If there is no skb after us, we are the last_skb ! */ | |
268 | if (!skb1) | |
269 | msk->ooo_last_skb = skb; | |
270 | ||
271 | end: | |
272 | skb_condense(skb); | |
273 | skb_set_owner_r(skb, sk); | |
274 | } | |
275 | ||
276 | static bool __mptcp_move_skb(struct mptcp_sock *msk, struct sock *ssk, | |
277 | struct sk_buff *skb, unsigned int offset, | |
278 | size_t copy_len) | |
6771bfd9 | 279 | { |
ab174ad8 | 280 | struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); |
6771bfd9 | 281 | struct sock *sk = (struct sock *)msk; |
4e637c70 | 282 | struct sk_buff *tail; |
6771bfd9 FW |
283 | |
284 | __skb_unlink(skb, &ssk->sk_receive_queue); | |
6771bfd9 | 285 | |
4e637c70 FW |
286 | skb_ext_reset(skb); |
287 | skb_orphan(skb); | |
ab174ad8 | 288 | |
9c3f94e1 PA |
289 | /* try to fetch required memory from subflow */ |
290 | if (!sk_rmem_schedule(sk, skb, skb->truesize)) { | |
291 | if (ssk->sk_forward_alloc < skb->truesize) | |
292 | goto drop; | |
293 | __sk_mem_reclaim(ssk, skb->truesize); | |
294 | if (!sk_rmem_schedule(sk, skb, skb->truesize)) | |
295 | goto drop; | |
296 | } | |
297 | ||
ab174ad8 PA |
298 | /* the skb map_seq accounts for the skb offset: |
299 | * mptcp_subflow_get_mapped_dsn() is based on the current tp->copied_seq | |
300 | * value | |
301 | */ | |
302 | MPTCP_SKB_CB(skb)->map_seq = mptcp_subflow_get_mapped_dsn(subflow); | |
303 | MPTCP_SKB_CB(skb)->end_seq = MPTCP_SKB_CB(skb)->map_seq + copy_len; | |
8268ed4c | 304 | MPTCP_SKB_CB(skb)->offset = offset; |
4e637c70 | 305 | |
ab174ad8 PA |
306 | if (MPTCP_SKB_CB(skb)->map_seq == msk->ack_seq) { |
307 | /* in sequence */ | |
8b0308fe | 308 | WRITE_ONCE(msk->ack_seq, msk->ack_seq + copy_len); |
ab174ad8 PA |
309 | tail = skb_peek_tail(&sk->sk_receive_queue); |
310 | if (tail && mptcp_try_coalesce(sk, tail, skb)) | |
311 | return true; | |
4e637c70 | 312 | |
ab174ad8 PA |
313 | skb_set_owner_r(skb, sk); |
314 | __skb_queue_tail(&sk->sk_receive_queue, skb); | |
315 | return true; | |
316 | } else if (after64(MPTCP_SKB_CB(skb)->map_seq, msk->ack_seq)) { | |
317 | mptcp_data_queue_ofo(msk, skb); | |
318 | return false; | |
319 | } | |
320 | ||
321 | /* old data, keep it simple and drop the whole pkt, sender | |
322 | * will retransmit as needed, if needed. | |
323 | */ | |
06242e44 | 324 | MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_DUPDATA); |
9c3f94e1 | 325 | drop: |
ab174ad8 PA |
326 | mptcp_drop(sk, skb); |
327 | return false; | |
6771bfd9 FW |
328 | } |
329 | ||
16a9a9da MM |
330 | static void mptcp_stop_timer(struct sock *sk) |
331 | { | |
332 | struct inet_connection_sock *icsk = inet_csk(sk); | |
333 | ||
334 | sk_stop_timer(sk, &icsk->icsk_retransmit_timer); | |
335 | mptcp_sk(sk)->timer_ival = 0; | |
336 | } | |
337 | ||
e16163b6 PA |
338 | static void mptcp_close_wake_up(struct sock *sk) |
339 | { | |
340 | if (sock_flag(sk, SOCK_DEAD)) | |
341 | return; | |
342 | ||
343 | sk->sk_state_change(sk); | |
344 | if (sk->sk_shutdown == SHUTDOWN_MASK || | |
345 | sk->sk_state == TCP_CLOSE) | |
346 | sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_HUP); | |
347 | else | |
348 | sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN); | |
349 | } | |
350 | ||
16a9a9da MM |
351 | static void mptcp_check_data_fin_ack(struct sock *sk) |
352 | { | |
353 | struct mptcp_sock *msk = mptcp_sk(sk); | |
354 | ||
355 | if (__mptcp_check_fallback(msk)) | |
356 | return; | |
357 | ||
358 | /* Look for an acknowledged DATA_FIN */ | |
359 | if (((1 << sk->sk_state) & | |
360 | (TCPF_FIN_WAIT1 | TCPF_CLOSING | TCPF_LAST_ACK)) && | |
361 | msk->write_seq == atomic64_read(&msk->snd_una)) { | |
362 | mptcp_stop_timer(sk); | |
363 | ||
364 | WRITE_ONCE(msk->snd_data_fin_enable, 0); | |
365 | ||
366 | switch (sk->sk_state) { | |
367 | case TCP_FIN_WAIT1: | |
368 | inet_sk_state_store(sk, TCP_FIN_WAIT2); | |
16a9a9da MM |
369 | break; |
370 | case TCP_CLOSING: | |
16a9a9da MM |
371 | case TCP_LAST_ACK: |
372 | inet_sk_state_store(sk, TCP_CLOSE); | |
16a9a9da MM |
373 | break; |
374 | } | |
375 | ||
e16163b6 | 376 | mptcp_close_wake_up(sk); |
16a9a9da MM |
377 | } |
378 | } | |
379 | ||
3721b9b6 MM |
380 | static bool mptcp_pending_data_fin(struct sock *sk, u64 *seq) |
381 | { | |
382 | struct mptcp_sock *msk = mptcp_sk(sk); | |
383 | ||
384 | if (READ_ONCE(msk->rcv_data_fin) && | |
385 | ((1 << sk->sk_state) & | |
386 | (TCPF_ESTABLISHED | TCPF_FIN_WAIT1 | TCPF_FIN_WAIT2))) { | |
387 | u64 rcv_data_fin_seq = READ_ONCE(msk->rcv_data_fin_seq); | |
388 | ||
389 | if (msk->ack_seq == rcv_data_fin_seq) { | |
390 | if (seq) | |
391 | *seq = rcv_data_fin_seq; | |
392 | ||
393 | return true; | |
394 | } | |
395 | } | |
396 | ||
397 | return false; | |
398 | } | |
399 | ||
400 | static void mptcp_set_timeout(const struct sock *sk, const struct sock *ssk) | |
401 | { | |
402 | long tout = ssk && inet_csk(ssk)->icsk_pending ? | |
403 | inet_csk(ssk)->icsk_timeout - jiffies : 0; | |
404 | ||
405 | if (tout <= 0) | |
406 | tout = mptcp_sk(sk)->timer_ival; | |
407 | mptcp_sk(sk)->timer_ival = tout > 0 ? tout : TCP_RTO_MIN; | |
408 | } | |
409 | ||
ea4ca586 PA |
410 | static bool mptcp_subflow_active(struct mptcp_subflow_context *subflow) |
411 | { | |
412 | struct sock *ssk = mptcp_subflow_tcp_sock(subflow); | |
413 | ||
414 | /* can't send if JOIN hasn't completed yet (i.e. is usable for mptcp) */ | |
415 | if (subflow->request_join && !subflow->fully_established) | |
416 | return false; | |
417 | ||
418 | /* only send if our side has not closed yet */ | |
419 | return ((1 << ssk->sk_state) & (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)); | |
420 | } | |
421 | ||
422 | static void mptcp_send_ack(struct mptcp_sock *msk, bool force) | |
7ed90803 PA |
423 | { |
424 | struct mptcp_subflow_context *subflow; | |
ea4ca586 | 425 | struct sock *pick = NULL; |
7ed90803 PA |
426 | |
427 | mptcp_for_each_subflow(msk, subflow) { | |
428 | struct sock *ssk = mptcp_subflow_tcp_sock(subflow); | |
429 | ||
ea4ca586 PA |
430 | if (force) { |
431 | lock_sock(ssk); | |
432 | tcp_send_ack(ssk); | |
433 | release_sock(ssk); | |
434 | continue; | |
435 | } | |
436 | ||
437 | /* if the hintes ssk is still active, use it */ | |
438 | pick = ssk; | |
439 | if (ssk == msk->ack_hint) | |
440 | break; | |
441 | } | |
442 | if (!force && pick) { | |
443 | lock_sock(pick); | |
444 | tcp_cleanup_rbuf(pick, 1); | |
445 | release_sock(pick); | |
7ed90803 PA |
446 | } |
447 | } | |
448 | ||
449 | static bool mptcp_check_data_fin(struct sock *sk) | |
3721b9b6 MM |
450 | { |
451 | struct mptcp_sock *msk = mptcp_sk(sk); | |
452 | u64 rcv_data_fin_seq; | |
7ed90803 | 453 | bool ret = false; |
3721b9b6 MM |
454 | |
455 | if (__mptcp_check_fallback(msk) || !msk->first) | |
7ed90803 | 456 | return ret; |
3721b9b6 MM |
457 | |
458 | /* Need to ack a DATA_FIN received from a peer while this side | |
459 | * of the connection is in ESTABLISHED, FIN_WAIT1, or FIN_WAIT2. | |
460 | * msk->rcv_data_fin was set when parsing the incoming options | |
461 | * at the subflow level and the msk lock was not held, so this | |
462 | * is the first opportunity to act on the DATA_FIN and change | |
463 | * the msk state. | |
464 | * | |
465 | * If we are caught up to the sequence number of the incoming | |
466 | * DATA_FIN, send the DATA_ACK now and do state transition. If | |
467 | * not caught up, do nothing and let the recv code send DATA_ACK | |
468 | * when catching up. | |
469 | */ | |
470 | ||
471 | if (mptcp_pending_data_fin(sk, &rcv_data_fin_seq)) { | |
917944da | 472 | WRITE_ONCE(msk->ack_seq, msk->ack_seq + 1); |
3721b9b6 MM |
473 | WRITE_ONCE(msk->rcv_data_fin, 0); |
474 | ||
475 | sk->sk_shutdown |= RCV_SHUTDOWN; | |
16a9a9da MM |
476 | smp_mb__before_atomic(); /* SHUTDOWN must be visible first */ |
477 | set_bit(MPTCP_DATA_READY, &msk->flags); | |
3721b9b6 MM |
478 | |
479 | switch (sk->sk_state) { | |
480 | case TCP_ESTABLISHED: | |
481 | inet_sk_state_store(sk, TCP_CLOSE_WAIT); | |
482 | break; | |
483 | case TCP_FIN_WAIT1: | |
484 | inet_sk_state_store(sk, TCP_CLOSING); | |
485 | break; | |
486 | case TCP_FIN_WAIT2: | |
487 | inet_sk_state_store(sk, TCP_CLOSE); | |
3721b9b6 MM |
488 | break; |
489 | default: | |
490 | /* Other states not expected */ | |
491 | WARN_ON_ONCE(1); | |
492 | break; | |
493 | } | |
494 | ||
7ed90803 | 495 | ret = true; |
3721b9b6 | 496 | mptcp_set_timeout(sk, NULL); |
ea4ca586 | 497 | mptcp_send_ack(msk, true); |
e16163b6 | 498 | mptcp_close_wake_up(sk); |
3721b9b6 | 499 | } |
7ed90803 | 500 | return ret; |
3721b9b6 MM |
501 | } |
502 | ||
6771bfd9 FW |
503 | static bool __mptcp_move_skbs_from_subflow(struct mptcp_sock *msk, |
504 | struct sock *ssk, | |
505 | unsigned int *bytes) | |
506 | { | |
507 | struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); | |
600911ff | 508 | struct sock *sk = (struct sock *)msk; |
6771bfd9 FW |
509 | unsigned int moved = 0; |
510 | bool more_data_avail; | |
511 | struct tcp_sock *tp; | |
512 | bool done = false; | |
13c7ba0c FW |
513 | int sk_rbuf; |
514 | ||
515 | sk_rbuf = READ_ONCE(sk->sk_rcvbuf); | |
516 | ||
517 | if (!(sk->sk_userlocks & SOCK_RCVBUF_LOCK)) { | |
518 | int ssk_rbuf = READ_ONCE(ssk->sk_rcvbuf); | |
519 | ||
520 | if (unlikely(ssk_rbuf > sk_rbuf)) { | |
521 | WRITE_ONCE(sk->sk_rcvbuf, ssk_rbuf); | |
522 | sk_rbuf = ssk_rbuf; | |
523 | } | |
524 | } | |
600911ff | 525 | |
ab174ad8 | 526 | pr_debug("msk=%p ssk=%p", msk, ssk); |
6771bfd9 FW |
527 | tp = tcp_sk(ssk); |
528 | do { | |
529 | u32 map_remaining, offset; | |
530 | u32 seq = tp->copied_seq; | |
531 | struct sk_buff *skb; | |
532 | bool fin; | |
533 | ||
534 | /* try to move as much data as available */ | |
535 | map_remaining = subflow->map_data_len - | |
536 | mptcp_subflow_get_map_offset(subflow); | |
537 | ||
538 | skb = skb_peek(&ssk->sk_receive_queue); | |
d9fb8c50 PA |
539 | if (!skb) { |
540 | /* if no data is found, a racing workqueue/recvmsg | |
541 | * already processed the new data, stop here or we | |
542 | * can enter an infinite loop | |
543 | */ | |
544 | if (!moved) | |
545 | done = true; | |
6771bfd9 | 546 | break; |
d9fb8c50 | 547 | } |
6771bfd9 | 548 | |
e1ff9e82 DC |
549 | if (__mptcp_check_fallback(msk)) { |
550 | /* if we are running under the workqueue, TCP could have | |
551 | * collapsed skbs between dummy map creation and now | |
552 | * be sure to adjust the size | |
553 | */ | |
554 | map_remaining = skb->len; | |
555 | subflow->map_data_len = skb->len; | |
556 | } | |
557 | ||
6771bfd9 FW |
558 | offset = seq - TCP_SKB_CB(skb)->seq; |
559 | fin = TCP_SKB_CB(skb)->tcp_flags & TCPHDR_FIN; | |
560 | if (fin) { | |
561 | done = true; | |
562 | seq++; | |
563 | } | |
564 | ||
565 | if (offset < skb->len) { | |
566 | size_t len = skb->len - offset; | |
567 | ||
568 | if (tp->urg_data) | |
569 | done = true; | |
570 | ||
ab174ad8 PA |
571 | if (__mptcp_move_skb(msk, ssk, skb, offset, len)) |
572 | moved += len; | |
6771bfd9 | 573 | seq += len; |
6771bfd9 FW |
574 | |
575 | if (WARN_ON_ONCE(map_remaining < len)) | |
576 | break; | |
577 | } else { | |
578 | WARN_ON_ONCE(!fin); | |
579 | sk_eat_skb(ssk, skb); | |
580 | done = true; | |
581 | } | |
582 | ||
583 | WRITE_ONCE(tp->copied_seq, seq); | |
584 | more_data_avail = mptcp_subflow_data_available(ssk); | |
600911ff | 585 | |
13c7ba0c | 586 | if (atomic_read(&sk->sk_rmem_alloc) > sk_rbuf) { |
600911ff FW |
587 | done = true; |
588 | break; | |
589 | } | |
6771bfd9 | 590 | } while (more_data_avail); |
ea4ca586 | 591 | msk->ack_hint = ssk; |
6771bfd9 | 592 | |
6719331c | 593 | *bytes += moved; |
6771bfd9 FW |
594 | return done; |
595 | } | |
596 | ||
ab174ad8 PA |
597 | static bool mptcp_ofo_queue(struct mptcp_sock *msk) |
598 | { | |
599 | struct sock *sk = (struct sock *)msk; | |
600 | struct sk_buff *skb, *tail; | |
601 | bool moved = false; | |
602 | struct rb_node *p; | |
603 | u64 end_seq; | |
604 | ||
605 | p = rb_first(&msk->out_of_order_queue); | |
06242e44 | 606 | pr_debug("msk=%p empty=%d", msk, RB_EMPTY_ROOT(&msk->out_of_order_queue)); |
ab174ad8 PA |
607 | while (p) { |
608 | skb = rb_to_skb(p); | |
609 | if (after64(MPTCP_SKB_CB(skb)->map_seq, msk->ack_seq)) | |
610 | break; | |
611 | ||
612 | p = rb_next(p); | |
613 | rb_erase(&skb->rbnode, &msk->out_of_order_queue); | |
614 | ||
615 | if (unlikely(!after64(MPTCP_SKB_CB(skb)->end_seq, | |
616 | msk->ack_seq))) { | |
617 | mptcp_drop(sk, skb); | |
06242e44 | 618 | MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_DUPDATA); |
ab174ad8 PA |
619 | continue; |
620 | } | |
621 | ||
622 | end_seq = MPTCP_SKB_CB(skb)->end_seq; | |
623 | tail = skb_peek_tail(&sk->sk_receive_queue); | |
624 | if (!tail || !mptcp_ooo_try_coalesce(msk, tail, skb)) { | |
625 | int delta = msk->ack_seq - MPTCP_SKB_CB(skb)->map_seq; | |
626 | ||
627 | /* skip overlapping data, if any */ | |
06242e44 PA |
628 | pr_debug("uncoalesced seq=%llx ack seq=%llx delta=%d", |
629 | MPTCP_SKB_CB(skb)->map_seq, msk->ack_seq, | |
630 | delta); | |
ab174ad8 PA |
631 | MPTCP_SKB_CB(skb)->offset += delta; |
632 | __skb_queue_tail(&sk->sk_receive_queue, skb); | |
633 | } | |
634 | msk->ack_seq = end_seq; | |
635 | moved = true; | |
636 | } | |
637 | return moved; | |
638 | } | |
639 | ||
2e52213c FW |
640 | /* In most cases we will be able to lock the mptcp socket. If its already |
641 | * owned, we need to defer to the work queue to avoid ABBA deadlock. | |
642 | */ | |
643 | static bool move_skbs_to_msk(struct mptcp_sock *msk, struct sock *ssk) | |
644 | { | |
645 | struct sock *sk = (struct sock *)msk; | |
646 | unsigned int moved = 0; | |
647 | ||
648 | if (READ_ONCE(sk->sk_lock.owned)) | |
649 | return false; | |
650 | ||
651 | if (unlikely(!spin_trylock_bh(&sk->sk_lock.slock))) | |
652 | return false; | |
653 | ||
654 | /* must re-check after taking the lock */ | |
ab174ad8 | 655 | if (!READ_ONCE(sk->sk_lock.owned)) { |
2e52213c | 656 | __mptcp_move_skbs_from_subflow(msk, ssk, &moved); |
ab174ad8 PA |
657 | mptcp_ofo_queue(msk); |
658 | ||
659 | /* If the moves have caught up with the DATA_FIN sequence number | |
660 | * it's time to ack the DATA_FIN and change socket state, but | |
661 | * this is not a good place to change state. Let the workqueue | |
662 | * do it. | |
663 | */ | |
ba8f48f7 PA |
664 | if (mptcp_pending_data_fin(sk, NULL)) |
665 | mptcp_schedule_work(sk); | |
ab174ad8 | 666 | } |
2e52213c FW |
667 | |
668 | spin_unlock_bh(&sk->sk_lock.slock); | |
669 | ||
670 | return moved > 0; | |
671 | } | |
672 | ||
673 | void mptcp_data_ready(struct sock *sk, struct sock *ssk) | |
101f6f85 | 674 | { |
6719331c | 675 | struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); |
101f6f85 | 676 | struct mptcp_sock *msk = mptcp_sk(sk); |
13c7ba0c | 677 | int sk_rbuf, ssk_rbuf; |
6719331c | 678 | bool wake; |
101f6f85 | 679 | |
6719331c PA |
680 | /* move_skbs_to_msk below can legitly clear the data_avail flag, |
681 | * but we will need later to properly woke the reader, cache its | |
682 | * value | |
683 | */ | |
684 | wake = subflow->data_avail == MPTCP_SUBFLOW_DATA_AVAIL; | |
685 | if (wake) | |
686 | set_bit(MPTCP_DATA_READY, &msk->flags); | |
6771bfd9 | 687 | |
13c7ba0c FW |
688 | ssk_rbuf = READ_ONCE(ssk->sk_rcvbuf); |
689 | sk_rbuf = READ_ONCE(sk->sk_rcvbuf); | |
690 | if (unlikely(ssk_rbuf > sk_rbuf)) | |
691 | sk_rbuf = ssk_rbuf; | |
692 | ||
693 | /* over limit? can't append more skbs to msk */ | |
694 | if (atomic_read(&sk->sk_rmem_alloc) > sk_rbuf) | |
2e52213c FW |
695 | goto wake; |
696 | ||
ea4ca586 | 697 | move_skbs_to_msk(msk, ssk); |
600911ff | 698 | |
600911ff | 699 | wake: |
6719331c PA |
700 | if (wake) |
701 | sk->sk_data_ready(sk); | |
101f6f85 FW |
702 | } |
703 | ||
84dfe367 | 704 | void __mptcp_flush_join_list(struct mptcp_sock *msk) |
ec3edaa7 PK |
705 | { |
706 | if (likely(list_empty(&msk->join_list))) | |
707 | return; | |
708 | ||
709 | spin_lock_bh(&msk->join_list_lock); | |
710 | list_splice_tail_init(&msk->join_list, &msk->conn_list); | |
711 | spin_unlock_bh(&msk->join_list_lock); | |
712 | } | |
713 | ||
b51f9b80 PA |
714 | static bool mptcp_timer_pending(struct sock *sk) |
715 | { | |
716 | return timer_pending(&inet_csk(sk)->icsk_retransmit_timer); | |
717 | } | |
718 | ||
719 | static void mptcp_reset_timer(struct sock *sk) | |
720 | { | |
721 | struct inet_connection_sock *icsk = inet_csk(sk); | |
722 | unsigned long tout; | |
723 | ||
e16163b6 PA |
724 | /* prevent rescheduling on close */ |
725 | if (unlikely(inet_sk_state_load(sk) == TCP_CLOSE)) | |
726 | return; | |
727 | ||
b51f9b80 PA |
728 | /* should never be called with mptcp level timer cleared */ |
729 | tout = READ_ONCE(mptcp_sk(sk)->timer_ival); | |
730 | if (WARN_ON_ONCE(!tout)) | |
731 | tout = TCP_RTO_MIN; | |
732 | sk_reset_timer(sk, &icsk->icsk_retransmit_timer, jiffies + tout); | |
733 | } | |
734 | ||
ba8f48f7 PA |
735 | bool mptcp_schedule_work(struct sock *sk) |
736 | { | |
737 | if (inet_sk_state_load(sk) != TCP_CLOSE && | |
738 | schedule_work(&mptcp_sk(sk)->work)) { | |
739 | /* each subflow already holds a reference to the sk, and the | |
740 | * workqueue is invoked by a subflow, so sk can't go away here. | |
741 | */ | |
742 | sock_hold(sk); | |
743 | return true; | |
744 | } | |
745 | return false; | |
746 | } | |
747 | ||
b51f9b80 PA |
748 | void mptcp_data_acked(struct sock *sk) |
749 | { | |
750 | mptcp_reset_timer(sk); | |
3b1d6210 | 751 | |
8edf0864 | 752 | if ((test_bit(MPTCP_NOSPACE, &mptcp_sk(sk)->flags) || |
813e0a68 | 753 | mptcp_send_head(sk) || |
ba8f48f7 PA |
754 | (inet_sk_state_load(sk) != TCP_ESTABLISHED))) |
755 | mptcp_schedule_work(sk); | |
b51f9b80 PA |
756 | } |
757 | ||
59832e24 FW |
758 | void mptcp_subflow_eof(struct sock *sk) |
759 | { | |
ba8f48f7 PA |
760 | if (!test_and_set_bit(MPTCP_WORK_EOF, &mptcp_sk(sk)->flags)) |
761 | mptcp_schedule_work(sk); | |
59832e24 FW |
762 | } |
763 | ||
5969856a PA |
764 | static void mptcp_check_for_eof(struct mptcp_sock *msk) |
765 | { | |
766 | struct mptcp_subflow_context *subflow; | |
767 | struct sock *sk = (struct sock *)msk; | |
768 | int receivers = 0; | |
769 | ||
770 | mptcp_for_each_subflow(msk, subflow) | |
771 | receivers += !subflow->rx_eof; | |
e16163b6 PA |
772 | if (receivers) |
773 | return; | |
5969856a | 774 | |
e16163b6 | 775 | if (!(sk->sk_shutdown & RCV_SHUTDOWN)) { |
5969856a PA |
776 | /* hopefully temporary hack: propagate shutdown status |
777 | * to msk, when all subflows agree on it | |
778 | */ | |
779 | sk->sk_shutdown |= RCV_SHUTDOWN; | |
780 | ||
781 | smp_mb__before_atomic(); /* SHUTDOWN must be visible first */ | |
782 | set_bit(MPTCP_DATA_READY, &msk->flags); | |
783 | sk->sk_data_ready(sk); | |
784 | } | |
e16163b6 PA |
785 | |
786 | switch (sk->sk_state) { | |
787 | case TCP_ESTABLISHED: | |
788 | inet_sk_state_store(sk, TCP_CLOSE_WAIT); | |
789 | break; | |
790 | case TCP_FIN_WAIT1: | |
26aa2314 PA |
791 | inet_sk_state_store(sk, TCP_CLOSING); |
792 | break; | |
793 | case TCP_FIN_WAIT2: | |
e16163b6 PA |
794 | inet_sk_state_store(sk, TCP_CLOSE); |
795 | break; | |
796 | default: | |
797 | return; | |
798 | } | |
799 | mptcp_close_wake_up(sk); | |
5969856a PA |
800 | } |
801 | ||
6d0060f6 MM |
802 | static bool mptcp_ext_cache_refill(struct mptcp_sock *msk) |
803 | { | |
4930f483 FW |
804 | const struct sock *sk = (const struct sock *)msk; |
805 | ||
6d0060f6 | 806 | if (!msk->cached_ext) |
4930f483 | 807 | msk->cached_ext = __skb_ext_alloc(sk->sk_allocation); |
6d0060f6 MM |
808 | |
809 | return !!msk->cached_ext; | |
810 | } | |
811 | ||
7a6a6cbc PA |
812 | static struct sock *mptcp_subflow_recv_lookup(const struct mptcp_sock *msk) |
813 | { | |
814 | struct mptcp_subflow_context *subflow; | |
815 | struct sock *sk = (struct sock *)msk; | |
816 | ||
817 | sock_owned_by_me(sk); | |
818 | ||
819 | mptcp_for_each_subflow(msk, subflow) { | |
820 | if (subflow->data_avail) | |
821 | return mptcp_subflow_tcp_sock(subflow); | |
822 | } | |
823 | ||
824 | return NULL; | |
825 | } | |
826 | ||
3f8e0aae PA |
827 | static bool mptcp_skb_can_collapse_to(u64 write_seq, |
828 | const struct sk_buff *skb, | |
829 | const struct mptcp_ext *mpext) | |
57040755 PA |
830 | { |
831 | if (!tcp_skb_can_collapse_to(skb)) | |
832 | return false; | |
833 | ||
5a369ca6 PA |
834 | /* can collapse only if MPTCP level sequence is in order and this |
835 | * mapping has not been xmitted yet | |
836 | */ | |
837 | return mpext && mpext->data_seq + mpext->data_len == write_seq && | |
838 | !mpext->frozen; | |
57040755 PA |
839 | } |
840 | ||
18b683bf PA |
841 | static bool mptcp_frag_can_collapse_to(const struct mptcp_sock *msk, |
842 | const struct page_frag *pfrag, | |
843 | const struct mptcp_data_frag *df) | |
844 | { | |
845 | return df && pfrag->page == df->page && | |
d9ca1de8 | 846 | pfrag->size - pfrag->offset > 0 && |
18b683bf PA |
847 | df->data_seq + df->data_len == msk->write_seq; |
848 | } | |
849 | ||
d027236c PA |
850 | static void dfrag_uncharge(struct sock *sk, int len) |
851 | { | |
852 | sk_mem_uncharge(sk, len); | |
7948f6cc | 853 | sk_wmem_queued_add(sk, -len); |
d027236c PA |
854 | } |
855 | ||
856 | static void dfrag_clear(struct sock *sk, struct mptcp_data_frag *dfrag) | |
18b683bf | 857 | { |
d027236c PA |
858 | int len = dfrag->data_len + dfrag->overhead; |
859 | ||
18b683bf | 860 | list_del(&dfrag->list); |
d027236c | 861 | dfrag_uncharge(sk, len); |
18b683bf PA |
862 | put_page(dfrag->page); |
863 | } | |
864 | ||
865 | static void mptcp_clean_una(struct sock *sk) | |
866 | { | |
867 | struct mptcp_sock *msk = mptcp_sk(sk); | |
868 | struct mptcp_data_frag *dtmp, *dfrag; | |
d027236c | 869 | bool cleaned = false; |
e1ff9e82 DC |
870 | u64 snd_una; |
871 | ||
872 | /* on fallback we just need to ignore snd_una, as this is really | |
873 | * plain TCP | |
874 | */ | |
875 | if (__mptcp_check_fallback(msk)) | |
eaa2ffab | 876 | atomic64_set(&msk->snd_una, msk->snd_nxt); |
6f8a612a | 877 | |
e1ff9e82 | 878 | snd_una = atomic64_read(&msk->snd_una); |
18b683bf PA |
879 | |
880 | list_for_each_entry_safe(dfrag, dtmp, &msk->rtx_queue, list) { | |
881 | if (after64(dfrag->data_seq + dfrag->data_len, snd_una)) | |
882 | break; | |
883 | ||
d9ca1de8 PA |
884 | if (WARN_ON_ONCE(dfrag == msk->first_pending)) |
885 | break; | |
d027236c PA |
886 | dfrag_clear(sk, dfrag); |
887 | cleaned = true; | |
888 | } | |
889 | ||
7948f6cc FW |
890 | dfrag = mptcp_rtx_head(sk); |
891 | if (dfrag && after64(snd_una, dfrag->data_seq)) { | |
53eb4c38 PA |
892 | u64 delta = snd_una - dfrag->data_seq; |
893 | ||
d9ca1de8 | 894 | if (WARN_ON_ONCE(delta > dfrag->already_sent)) |
53eb4c38 | 895 | goto out; |
7948f6cc FW |
896 | |
897 | dfrag->data_seq += delta; | |
53eb4c38 | 898 | dfrag->offset += delta; |
7948f6cc | 899 | dfrag->data_len -= delta; |
d9ca1de8 | 900 | dfrag->already_sent -= delta; |
7948f6cc FW |
901 | |
902 | dfrag_uncharge(sk, delta); | |
903 | cleaned = true; | |
904 | } | |
905 | ||
53eb4c38 | 906 | out: |
95ed690e | 907 | if (cleaned) |
d027236c | 908 | sk_mem_reclaim_partial(sk); |
95ed690e | 909 | } |
7948f6cc | 910 | |
95ed690e FW |
911 | static void mptcp_clean_una_wakeup(struct sock *sk) |
912 | { | |
913 | struct mptcp_sock *msk = mptcp_sk(sk); | |
63561a40 | 914 | |
95ed690e FW |
915 | mptcp_clean_una(sk); |
916 | ||
917 | /* Only wake up writers if a subflow is ready */ | |
8edf0864 FW |
918 | if (sk_stream_is_writeable(sk)) { |
919 | clear_bit(MPTCP_NOSPACE, &msk->flags); | |
95ed690e | 920 | sk_stream_write_space(sk); |
18b683bf PA |
921 | } |
922 | } | |
923 | ||
924 | /* ensure we get enough memory for the frag hdr, beyond some minimal amount of | |
925 | * data | |
926 | */ | |
927 | static bool mptcp_page_frag_refill(struct sock *sk, struct page_frag *pfrag) | |
928 | { | |
d9ca1de8 PA |
929 | struct mptcp_subflow_context *subflow; |
930 | struct mptcp_sock *msk = mptcp_sk(sk); | |
931 | bool first = true; | |
932 | ||
18b683bf PA |
933 | if (likely(skb_page_frag_refill(32U + sizeof(struct mptcp_data_frag), |
934 | pfrag, sk->sk_allocation))) | |
935 | return true; | |
936 | ||
18b683bf | 937 | sk_stream_moderate_sndbuf(sk); |
d9ca1de8 PA |
938 | mptcp_for_each_subflow(msk, subflow) { |
939 | struct sock *ssk = mptcp_subflow_tcp_sock(subflow); | |
940 | ||
941 | if (first) | |
942 | tcp_enter_memory_pressure(ssk); | |
943 | sk_stream_moderate_sndbuf(ssk); | |
944 | first = false; | |
945 | } | |
18b683bf PA |
946 | return false; |
947 | } | |
948 | ||
949 | static struct mptcp_data_frag * | |
950 | mptcp_carve_data_frag(const struct mptcp_sock *msk, struct page_frag *pfrag, | |
951 | int orig_offset) | |
952 | { | |
953 | int offset = ALIGN(orig_offset, sizeof(long)); | |
954 | struct mptcp_data_frag *dfrag; | |
955 | ||
956 | dfrag = (struct mptcp_data_frag *)(page_to_virt(pfrag->page) + offset); | |
957 | dfrag->data_len = 0; | |
958 | dfrag->data_seq = msk->write_seq; | |
959 | dfrag->overhead = offset - orig_offset + sizeof(struct mptcp_data_frag); | |
960 | dfrag->offset = offset + sizeof(struct mptcp_data_frag); | |
d9ca1de8 | 961 | dfrag->already_sent = 0; |
18b683bf PA |
962 | dfrag->page = pfrag->page; |
963 | ||
964 | return dfrag; | |
965 | } | |
966 | ||
caf971df PA |
967 | struct mptcp_sendmsg_info { |
968 | int mss_now; | |
969 | int size_goal; | |
d9ca1de8 PA |
970 | u16 limit; |
971 | u16 sent; | |
972 | unsigned int flags; | |
caf971df PA |
973 | }; |
974 | ||
6f8a612a FW |
975 | static int mptcp_check_allowed_size(struct mptcp_sock *msk, u64 data_seq, |
976 | int avail_size) | |
977 | { | |
978 | u64 window_end = mptcp_wnd_end(msk); | |
979 | ||
980 | if (__mptcp_check_fallback(msk)) | |
981 | return avail_size; | |
982 | ||
983 | if (!before64(data_seq + avail_size, window_end)) { | |
984 | u64 allowed_size = window_end - data_seq; | |
985 | ||
986 | return min_t(unsigned int, allowed_size, avail_size); | |
987 | } | |
988 | ||
989 | return avail_size; | |
990 | } | |
991 | ||
6d0060f6 | 992 | static int mptcp_sendmsg_frag(struct sock *sk, struct sock *ssk, |
d9ca1de8 | 993 | struct mptcp_data_frag *dfrag, |
caf971df | 994 | struct mptcp_sendmsg_info *info) |
6d0060f6 | 995 | { |
d9ca1de8 | 996 | u64 data_seq = dfrag->data_seq + info->sent; |
6d0060f6 | 997 | struct mptcp_sock *msk = mptcp_sk(sk); |
6f8a612a | 998 | bool zero_window_probe = false; |
6d0060f6 | 999 | struct mptcp_ext *mpext = NULL; |
57040755 | 1000 | struct sk_buff *skb, *tail; |
d9ca1de8 PA |
1001 | bool can_collapse = false; |
1002 | int avail_size; | |
1003 | size_t ret; | |
6d0060f6 | 1004 | |
d9ca1de8 PA |
1005 | pr_debug("msk=%p ssk=%p sending dfrag at seq=%lld len=%d already sent=%d", |
1006 | msk, ssk, dfrag->data_seq, dfrag->data_len, info->sent); | |
1007 | ||
1008 | /* compute send limit */ | |
1009 | info->mss_now = tcp_send_mss(ssk, &info->size_goal, info->flags); | |
caf971df | 1010 | avail_size = info->size_goal; |
57040755 PA |
1011 | skb = tcp_write_queue_tail(ssk); |
1012 | if (skb) { | |
57040755 PA |
1013 | /* Limit the write to the size available in the |
1014 | * current skb, if any, so that we create at most a new skb. | |
1015 | * Explicitly tells TCP internals to avoid collapsing on later | |
1016 | * queue management operation, to avoid breaking the ext <-> | |
1017 | * SSN association set here | |
1018 | */ | |
d9ca1de8 | 1019 | mpext = skb_ext_find(skb, SKB_EXT_MPTCP); |
caf971df | 1020 | can_collapse = (info->size_goal - skb->len > 0) && |
d9ca1de8 | 1021 | mptcp_skb_can_collapse_to(data_seq, skb, mpext); |
57040755 PA |
1022 | if (!can_collapse) |
1023 | TCP_SKB_CB(skb)->eor = 1; | |
1024 | else | |
caf971df | 1025 | avail_size = info->size_goal - skb->len; |
57040755 | 1026 | } |
18b683bf | 1027 | |
6f8a612a FW |
1028 | /* Zero window and all data acked? Probe. */ |
1029 | avail_size = mptcp_check_allowed_size(msk, data_seq, avail_size); | |
1030 | if (avail_size == 0) { | |
1031 | if (skb || atomic64_read(&msk->snd_una) != msk->snd_nxt) | |
1032 | return 0; | |
1033 | zero_window_probe = true; | |
1034 | data_seq = atomic64_read(&msk->snd_una) - 1; | |
1035 | avail_size = 1; | |
1036 | } | |
1037 | ||
d9ca1de8 PA |
1038 | if (WARN_ON_ONCE(info->sent > info->limit || |
1039 | info->limit > dfrag->data_len)) | |
1040 | return 0; | |
d027236c | 1041 | |
d9ca1de8 PA |
1042 | ret = info->limit - info->sent; |
1043 | tail = tcp_build_frag(ssk, avail_size, info->flags, dfrag->page, | |
1044 | dfrag->offset + info->sent, &ret); | |
e2223995 PA |
1045 | if (!tail) { |
1046 | tcp_remove_empty_skb(sk, tcp_write_queue_tail(ssk)); | |
1047 | return -ENOMEM; | |
35759383 | 1048 | } |
18b683bf | 1049 | |
e2223995 | 1050 | /* if the tail skb is still the cached one, collapsing really happened. |
57040755 | 1051 | */ |
e2223995 | 1052 | if (skb == tail) { |
57040755 PA |
1053 | WARN_ON_ONCE(!can_collapse); |
1054 | mpext->data_len += ret; | |
6f8a612a | 1055 | WARN_ON_ONCE(zero_window_probe); |
57040755 PA |
1056 | goto out; |
1057 | } | |
1058 | ||
e2223995 | 1059 | mpext = __skb_ext_set(tail, SKB_EXT_MPTCP, msk->cached_ext); |
6d0060f6 MM |
1060 | msk->cached_ext = NULL; |
1061 | ||
1062 | memset(mpext, 0, sizeof(*mpext)); | |
d9ca1de8 | 1063 | mpext->data_seq = data_seq; |
6d0060f6 MM |
1064 | mpext->subflow_seq = mptcp_subflow_ctx(ssk)->rel_write_seq; |
1065 | mpext->data_len = ret; | |
1066 | mpext->use_map = 1; | |
1067 | mpext->dsn64 = 1; | |
1068 | ||
1069 | pr_debug("data_seq=%llu subflow_seq=%u data_len=%u dsn64=%d", | |
1070 | mpext->data_seq, mpext->subflow_seq, mpext->data_len, | |
1071 | mpext->dsn64); | |
1072 | ||
6f8a612a FW |
1073 | if (zero_window_probe) { |
1074 | mptcp_subflow_ctx(ssk)->rel_write_seq += ret; | |
1075 | mpext->frozen = 1; | |
1076 | ret = 0; | |
1077 | tcp_push_pending_frames(ssk); | |
1078 | } | |
57040755 | 1079 | out: |
6d0060f6 | 1080 | mptcp_subflow_ctx(ssk)->rel_write_seq += ret; |
6d0060f6 MM |
1081 | return ret; |
1082 | } | |
1083 | ||
63561a40 | 1084 | static void mptcp_nospace(struct mptcp_sock *msk) |
a0e17064 | 1085 | { |
63561a40 PA |
1086 | struct mptcp_subflow_context *subflow; |
1087 | ||
8edf0864 | 1088 | set_bit(MPTCP_NOSPACE, &msk->flags); |
a0e17064 FW |
1089 | smp_mb__after_atomic(); /* msk->flags is changed by write_space cb */ |
1090 | ||
63561a40 PA |
1091 | mptcp_for_each_subflow(msk, subflow) { |
1092 | struct sock *ssk = mptcp_subflow_tcp_sock(subflow); | |
8edf0864 | 1093 | bool ssk_writeable = sk_stream_is_writeable(ssk); |
63561a40 PA |
1094 | struct socket *sock = READ_ONCE(ssk->sk_socket); |
1095 | ||
8edf0864 FW |
1096 | if (ssk_writeable || !sock) |
1097 | continue; | |
1098 | ||
63561a40 | 1099 | /* enables ssk->write_space() callbacks */ |
8edf0864 | 1100 | set_bit(SOCK_NOSPACE, &sock->flags); |
63561a40 | 1101 | } |
8edf0864 FW |
1102 | |
1103 | /* mptcp_data_acked() could run just before we set the NOSPACE bit, | |
1104 | * so explicitly check for snd_una value | |
1105 | */ | |
1106 | mptcp_clean_una((struct sock *)msk); | |
a0e17064 FW |
1107 | } |
1108 | ||
d5f49190 PA |
1109 | #define MPTCP_SEND_BURST_SIZE ((1 << 16) - \ |
1110 | sizeof(struct tcphdr) - \ | |
1111 | MAX_TCP_OPTION_SPACE - \ | |
1112 | sizeof(struct ipv6hdr) - \ | |
1113 | sizeof(struct frag_hdr)) | |
1114 | ||
1115 | struct subflow_send_info { | |
1116 | struct sock *ssk; | |
1117 | u64 ratio; | |
1118 | }; | |
1119 | ||
da51aef5 PA |
1120 | static struct sock *mptcp_subflow_get_send(struct mptcp_sock *msk, |
1121 | u32 *sndbuf) | |
f296234c | 1122 | { |
d5f49190 | 1123 | struct subflow_send_info send_info[2]; |
f296234c | 1124 | struct mptcp_subflow_context *subflow; |
d5f49190 PA |
1125 | int i, nr_active = 0; |
1126 | struct sock *ssk; | |
1127 | u64 ratio; | |
1128 | u32 pace; | |
f296234c | 1129 | |
d5f49190 | 1130 | sock_owned_by_me((struct sock *)msk); |
f296234c | 1131 | |
da51aef5 | 1132 | *sndbuf = 0; |
149f7c71 FW |
1133 | if (!mptcp_ext_cache_refill(msk)) |
1134 | return NULL; | |
1135 | ||
d5f49190 PA |
1136 | if (__mptcp_check_fallback(msk)) { |
1137 | if (!msk->first) | |
f296234c | 1138 | return NULL; |
d5f49190 PA |
1139 | *sndbuf = msk->first->sk_sndbuf; |
1140 | return sk_stream_memory_free(msk->first) ? msk->first : NULL; | |
1141 | } | |
1142 | ||
1143 | /* re-use last subflow, if the burst allow that */ | |
1144 | if (msk->last_snd && msk->snd_burst > 0 && | |
1145 | sk_stream_memory_free(msk->last_snd) && | |
1146 | mptcp_subflow_active(mptcp_subflow_ctx(msk->last_snd))) { | |
1147 | mptcp_for_each_subflow(msk, subflow) { | |
1148 | ssk = mptcp_subflow_tcp_sock(subflow); | |
1149 | *sndbuf = max(tcp_sk(ssk)->snd_wnd, *sndbuf); | |
f296234c | 1150 | } |
d5f49190 PA |
1151 | return msk->last_snd; |
1152 | } | |
f296234c | 1153 | |
d5f49190 PA |
1154 | /* pick the subflow with the lower wmem/wspace ratio */ |
1155 | for (i = 0; i < 2; ++i) { | |
1156 | send_info[i].ssk = NULL; | |
1157 | send_info[i].ratio = -1; | |
1158 | } | |
1159 | mptcp_for_each_subflow(msk, subflow) { | |
1160 | ssk = mptcp_subflow_tcp_sock(subflow); | |
1161 | if (!mptcp_subflow_active(subflow)) | |
1162 | continue; | |
1163 | ||
1164 | nr_active += !subflow->backup; | |
da51aef5 | 1165 | *sndbuf = max(tcp_sk(ssk)->snd_wnd, *sndbuf); |
d5f49190 PA |
1166 | if (!sk_stream_memory_free(subflow->tcp_sock)) |
1167 | continue; | |
f296234c | 1168 | |
d5f49190 PA |
1169 | pace = READ_ONCE(ssk->sk_pacing_rate); |
1170 | if (!pace) | |
f296234c | 1171 | continue; |
f296234c | 1172 | |
d5f49190 PA |
1173 | ratio = div_u64((u64)READ_ONCE(ssk->sk_wmem_queued) << 32, |
1174 | pace); | |
1175 | if (ratio < send_info[subflow->backup].ratio) { | |
1176 | send_info[subflow->backup].ssk = ssk; | |
1177 | send_info[subflow->backup].ratio = ratio; | |
1178 | } | |
f296234c PK |
1179 | } |
1180 | ||
d5f49190 PA |
1181 | pr_debug("msk=%p nr_active=%d ssk=%p:%lld backup=%p:%lld", |
1182 | msk, nr_active, send_info[0].ssk, send_info[0].ratio, | |
1183 | send_info[1].ssk, send_info[1].ratio); | |
1184 | ||
1185 | /* pick the best backup if no other subflow is active */ | |
1186 | if (!nr_active) | |
1187 | send_info[0].ssk = send_info[1].ssk; | |
1188 | ||
1189 | if (send_info[0].ssk) { | |
1190 | msk->last_snd = send_info[0].ssk; | |
1191 | msk->snd_burst = min_t(int, MPTCP_SEND_BURST_SIZE, | |
1192 | sk_stream_wspace(msk->last_snd)); | |
1193 | return msk->last_snd; | |
1194 | } | |
1195 | return NULL; | |
f296234c PK |
1196 | } |
1197 | ||
d9ca1de8 PA |
1198 | static void mptcp_push_release(struct sock *sk, struct sock *ssk, |
1199 | struct mptcp_sendmsg_info *info) | |
1200 | { | |
1201 | mptcp_set_timeout(sk, ssk); | |
1202 | tcp_push(ssk, 0, info->mss_now, tcp_sk(ssk)->nonagle, info->size_goal); | |
1203 | release_sock(ssk); | |
1204 | } | |
1205 | ||
1206 | static void mptcp_push_pending(struct sock *sk, unsigned int flags) | |
f870fa0b | 1207 | { |
d9ca1de8 | 1208 | struct sock *prev_ssk = NULL, *ssk = NULL; |
f870fa0b | 1209 | struct mptcp_sock *msk = mptcp_sk(sk); |
caf971df | 1210 | struct mptcp_sendmsg_info info = { |
d9ca1de8 | 1211 | .flags = flags, |
caf971df | 1212 | }; |
d9ca1de8 PA |
1213 | struct mptcp_data_frag *dfrag; |
1214 | int len, copied = 0; | |
1215 | u32 sndbuf; | |
1216 | ||
1217 | while ((dfrag = mptcp_send_head(sk))) { | |
1218 | info.sent = dfrag->already_sent; | |
1219 | info.limit = dfrag->data_len; | |
1220 | len = dfrag->data_len - dfrag->already_sent; | |
1221 | while (len > 0) { | |
1222 | int ret = 0; | |
1223 | ||
1224 | prev_ssk = ssk; | |
1225 | __mptcp_flush_join_list(msk); | |
1226 | ssk = mptcp_subflow_get_send(msk, &sndbuf); | |
1227 | ||
1228 | /* do auto tuning */ | |
1229 | if (!(sk->sk_userlocks & SOCK_SNDBUF_LOCK) && | |
1230 | sndbuf > READ_ONCE(sk->sk_sndbuf)) | |
1231 | WRITE_ONCE(sk->sk_sndbuf, sndbuf); | |
1232 | ||
1233 | /* try to keep the subflow socket lock across | |
1234 | * consecutive xmit on the same socket | |
1235 | */ | |
1236 | if (ssk != prev_ssk && prev_ssk) | |
1237 | mptcp_push_release(sk, prev_ssk, &info); | |
1238 | if (!ssk) | |
1239 | goto out; | |
1240 | ||
1241 | if (ssk != prev_ssk || !prev_ssk) | |
1242 | lock_sock(ssk); | |
1243 | ||
1244 | ret = mptcp_sendmsg_frag(sk, ssk, dfrag, &info); | |
1245 | if (ret <= 0) { | |
1246 | mptcp_push_release(sk, ssk, &info); | |
1247 | goto out; | |
1248 | } | |
1249 | ||
1250 | info.sent += ret; | |
1251 | dfrag->already_sent += ret; | |
1252 | msk->snd_nxt += ret; | |
1253 | msk->snd_burst -= ret; | |
1254 | copied += ret; | |
1255 | len -= ret; | |
1256 | } | |
1257 | WRITE_ONCE(msk->first_pending, mptcp_send_next(sk)); | |
1258 | } | |
1259 | ||
1260 | /* at this point we held the socket lock for the last subflow we used */ | |
1261 | if (ssk) | |
1262 | mptcp_push_release(sk, ssk, &info); | |
1263 | ||
1264 | out: | |
b680a214 PA |
1265 | if (copied) { |
1266 | /* start the timer, if it's not pending */ | |
1267 | if (!mptcp_timer_pending(sk)) | |
1268 | mptcp_reset_timer(sk); | |
d9ca1de8 | 1269 | __mptcp_check_send_data_fin(sk); |
b680a214 | 1270 | } |
d9ca1de8 PA |
1271 | } |
1272 | ||
1273 | static int mptcp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) | |
1274 | { | |
1275 | struct mptcp_sock *msk = mptcp_sk(sk); | |
17091708 | 1276 | struct page_frag *pfrag; |
6d0060f6 | 1277 | size_t copied = 0; |
caf971df | 1278 | int ret = 0; |
6d0060f6 | 1279 | long timeo; |
f870fa0b MM |
1280 | |
1281 | if (msg->msg_flags & ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL)) | |
1282 | return -EOPNOTSUPP; | |
1283 | ||
cec37a6e | 1284 | lock_sock(sk); |
1954b860 MM |
1285 | |
1286 | timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); | |
1287 | ||
1288 | if ((1 << sk->sk_state) & ~(TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)) { | |
1289 | ret = sk_stream_wait_connect(sk, &timeo); | |
1290 | if (ret) | |
1291 | goto out; | |
1292 | } | |
1293 | ||
17091708 | 1294 | pfrag = sk_page_frag(sk); |
18b683bf PA |
1295 | mptcp_clean_una(sk); |
1296 | ||
d9ca1de8 PA |
1297 | while (msg_data_left(msg)) { |
1298 | struct mptcp_data_frag *dfrag; | |
1299 | int frag_truesize = 0; | |
1300 | bool dfrag_collapsed; | |
1301 | size_t psize, offset; | |
18b683bf | 1302 | |
d9ca1de8 PA |
1303 | if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN)) { |
1304 | ret = -EPIPE; | |
f296234c PK |
1305 | goto out; |
1306 | } | |
da51aef5 | 1307 | |
d9ca1de8 PA |
1308 | /* reuse tail pfrag, if possible, or carve a new one from the |
1309 | * page allocator | |
1310 | */ | |
1311 | dfrag = mptcp_pending_tail(sk); | |
1312 | dfrag_collapsed = mptcp_frag_can_collapse_to(msk, pfrag, dfrag); | |
1313 | if (!dfrag_collapsed) { | |
1314 | if (!sk_stream_memory_free(sk)) { | |
1315 | mptcp_push_pending(sk, msg->msg_flags); | |
1316 | if (!sk_stream_memory_free(sk)) | |
1317 | goto wait_for_memory; | |
72511aab | 1318 | } |
d9ca1de8 PA |
1319 | if (!mptcp_page_frag_refill(sk, pfrag)) |
1320 | goto wait_for_memory; | |
1321 | ||
1322 | dfrag = mptcp_carve_data_frag(msk, pfrag, pfrag->offset); | |
1323 | frag_truesize = dfrag->overhead; | |
72511aab | 1324 | } |
6d0060f6 | 1325 | |
d9ca1de8 PA |
1326 | /* we do not bound vs wspace, to allow a single packet. |
1327 | * memory accounting will prevent execessive memory usage | |
1328 | * anyway | |
d5f49190 | 1329 | */ |
d9ca1de8 PA |
1330 | offset = dfrag->offset + dfrag->data_len; |
1331 | psize = pfrag->size - offset; | |
1332 | psize = min_t(size_t, psize, msg_data_left(msg)); | |
1333 | if (!sk_wmem_schedule(sk, psize + frag_truesize)) | |
1334 | goto wait_for_memory; | |
1335 | ||
1336 | if (copy_page_from_iter(dfrag->page, offset, psize, | |
1337 | &msg->msg_iter) != psize) { | |
1338 | ret = -EFAULT; | |
1339 | goto out; | |
72511aab FW |
1340 | } |
1341 | ||
d9ca1de8 PA |
1342 | /* data successfully copied into the write queue */ |
1343 | copied += psize; | |
1344 | dfrag->data_len += psize; | |
1345 | frag_truesize += psize; | |
1346 | pfrag->offset += frag_truesize; | |
1347 | WRITE_ONCE(msk->write_seq, msk->write_seq + psize); | |
1348 | ||
1349 | /* charge data on mptcp pending queue to the msk socket | |
1350 | * Note: we charge such data both to sk and ssk | |
fb529e62 | 1351 | */ |
d9ca1de8 PA |
1352 | sk_wmem_queued_add(sk, frag_truesize); |
1353 | sk->sk_forward_alloc -= frag_truesize; | |
1354 | if (!dfrag_collapsed) { | |
1355 | get_page(dfrag->page); | |
1356 | list_add_tail(&dfrag->list, &msk->rtx_queue); | |
1357 | if (!msk->first_pending) | |
1358 | WRITE_ONCE(msk->first_pending, dfrag); | |
fb529e62 | 1359 | } |
d9ca1de8 PA |
1360 | pr_debug("msk=%p dfrag at seq=%lld len=%d sent=%d new=%d", msk, |
1361 | dfrag->data_seq, dfrag->data_len, dfrag->already_sent, | |
1362 | !dfrag_collapsed); | |
6d0060f6 | 1363 | |
d9ca1de8 PA |
1364 | if (!mptcp_ext_cache_refill(msk)) |
1365 | goto wait_for_memory; | |
1366 | continue; | |
b51f9b80 | 1367 | |
d9ca1de8 PA |
1368 | wait_for_memory: |
1369 | mptcp_nospace(msk); | |
d9ca1de8 | 1370 | if (mptcp_timer_pending(sk)) |
b51f9b80 | 1371 | mptcp_reset_timer(sk); |
d9ca1de8 PA |
1372 | ret = sk_stream_wait_memory(sk, &timeo); |
1373 | if (ret) | |
1374 | goto out; | |
57040755 | 1375 | } |
6d0060f6 | 1376 | |
d9ca1de8 PA |
1377 | if (copied) |
1378 | mptcp_push_pending(sk, msg->msg_flags); | |
1379 | ||
1954b860 | 1380 | out: |
cec37a6e | 1381 | release_sock(sk); |
8555c6bf | 1382 | return copied ? : ret; |
f870fa0b MM |
1383 | } |
1384 | ||
7a6a6cbc PA |
1385 | static void mptcp_wait_data(struct sock *sk, long *timeo) |
1386 | { | |
1387 | DEFINE_WAIT_FUNC(wait, woken_wake_function); | |
1388 | struct mptcp_sock *msk = mptcp_sk(sk); | |
1389 | ||
1390 | add_wait_queue(sk_sleep(sk), &wait); | |
1391 | sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk); | |
1392 | ||
1393 | sk_wait_event(sk, timeo, | |
1394 | test_and_clear_bit(MPTCP_DATA_READY, &msk->flags), &wait); | |
1395 | ||
1396 | sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk); | |
1397 | remove_wait_queue(sk_sleep(sk), &wait); | |
1398 | } | |
1399 | ||
6771bfd9 FW |
1400 | static int __mptcp_recvmsg_mskq(struct mptcp_sock *msk, |
1401 | struct msghdr *msg, | |
1402 | size_t len) | |
1403 | { | |
1404 | struct sock *sk = (struct sock *)msk; | |
1405 | struct sk_buff *skb; | |
1406 | int copied = 0; | |
1407 | ||
1408 | while ((skb = skb_peek(&sk->sk_receive_queue)) != NULL) { | |
1409 | u32 offset = MPTCP_SKB_CB(skb)->offset; | |
1410 | u32 data_len = skb->len - offset; | |
1411 | u32 count = min_t(size_t, len - copied, data_len); | |
1412 | int err; | |
1413 | ||
1414 | err = skb_copy_datagram_msg(skb, offset, msg, count); | |
1415 | if (unlikely(err < 0)) { | |
1416 | if (!copied) | |
1417 | return err; | |
1418 | break; | |
1419 | } | |
1420 | ||
1421 | copied += count; | |
1422 | ||
1423 | if (count < data_len) { | |
1424 | MPTCP_SKB_CB(skb)->offset += count; | |
1425 | break; | |
1426 | } | |
1427 | ||
1428 | __skb_unlink(skb, &sk->sk_receive_queue); | |
1429 | __kfree_skb(skb); | |
1430 | ||
1431 | if (copied >= len) | |
1432 | break; | |
1433 | } | |
1434 | ||
1435 | return copied; | |
1436 | } | |
1437 | ||
a6b118fe FW |
1438 | /* receive buffer autotuning. See tcp_rcv_space_adjust for more information. |
1439 | * | |
1440 | * Only difference: Use highest rtt estimate of the subflows in use. | |
1441 | */ | |
1442 | static void mptcp_rcv_space_adjust(struct mptcp_sock *msk, int copied) | |
1443 | { | |
1444 | struct mptcp_subflow_context *subflow; | |
1445 | struct sock *sk = (struct sock *)msk; | |
1446 | u32 time, advmss = 1; | |
1447 | u64 rtt_us, mstamp; | |
1448 | ||
1449 | sock_owned_by_me(sk); | |
1450 | ||
1451 | if (copied <= 0) | |
1452 | return; | |
1453 | ||
1454 | msk->rcvq_space.copied += copied; | |
1455 | ||
1456 | mstamp = div_u64(tcp_clock_ns(), NSEC_PER_USEC); | |
1457 | time = tcp_stamp_us_delta(mstamp, msk->rcvq_space.time); | |
1458 | ||
1459 | rtt_us = msk->rcvq_space.rtt_us; | |
1460 | if (rtt_us && time < (rtt_us >> 3)) | |
1461 | return; | |
1462 | ||
1463 | rtt_us = 0; | |
1464 | mptcp_for_each_subflow(msk, subflow) { | |
1465 | const struct tcp_sock *tp; | |
1466 | u64 sf_rtt_us; | |
1467 | u32 sf_advmss; | |
1468 | ||
1469 | tp = tcp_sk(mptcp_subflow_tcp_sock(subflow)); | |
1470 | ||
1471 | sf_rtt_us = READ_ONCE(tp->rcv_rtt_est.rtt_us); | |
1472 | sf_advmss = READ_ONCE(tp->advmss); | |
1473 | ||
1474 | rtt_us = max(sf_rtt_us, rtt_us); | |
1475 | advmss = max(sf_advmss, advmss); | |
1476 | } | |
1477 | ||
1478 | msk->rcvq_space.rtt_us = rtt_us; | |
1479 | if (time < (rtt_us >> 3) || rtt_us == 0) | |
1480 | return; | |
1481 | ||
1482 | if (msk->rcvq_space.copied <= msk->rcvq_space.space) | |
1483 | goto new_measure; | |
1484 | ||
1485 | if (sock_net(sk)->ipv4.sysctl_tcp_moderate_rcvbuf && | |
1486 | !(sk->sk_userlocks & SOCK_RCVBUF_LOCK)) { | |
1487 | int rcvmem, rcvbuf; | |
1488 | u64 rcvwin, grow; | |
1489 | ||
1490 | rcvwin = ((u64)msk->rcvq_space.copied << 1) + 16 * advmss; | |
1491 | ||
1492 | grow = rcvwin * (msk->rcvq_space.copied - msk->rcvq_space.space); | |
1493 | ||
1494 | do_div(grow, msk->rcvq_space.space); | |
1495 | rcvwin += (grow << 1); | |
1496 | ||
1497 | rcvmem = SKB_TRUESIZE(advmss + MAX_TCP_HEADER); | |
1498 | while (tcp_win_from_space(sk, rcvmem) < advmss) | |
1499 | rcvmem += 128; | |
1500 | ||
1501 | do_div(rcvwin, advmss); | |
1502 | rcvbuf = min_t(u64, rcvwin * rcvmem, | |
1503 | sock_net(sk)->ipv4.sysctl_tcp_rmem[2]); | |
1504 | ||
1505 | if (rcvbuf > sk->sk_rcvbuf) { | |
1506 | u32 window_clamp; | |
1507 | ||
1508 | window_clamp = tcp_win_from_space(sk, rcvbuf); | |
1509 | WRITE_ONCE(sk->sk_rcvbuf, rcvbuf); | |
1510 | ||
1511 | /* Make subflows follow along. If we do not do this, we | |
1512 | * get drops at subflow level if skbs can't be moved to | |
1513 | * the mptcp rx queue fast enough (announced rcv_win can | |
1514 | * exceed ssk->sk_rcvbuf). | |
1515 | */ | |
1516 | mptcp_for_each_subflow(msk, subflow) { | |
1517 | struct sock *ssk; | |
c76c6956 | 1518 | bool slow; |
a6b118fe FW |
1519 | |
1520 | ssk = mptcp_subflow_tcp_sock(subflow); | |
c76c6956 | 1521 | slow = lock_sock_fast(ssk); |
a6b118fe FW |
1522 | WRITE_ONCE(ssk->sk_rcvbuf, rcvbuf); |
1523 | tcp_sk(ssk)->window_clamp = window_clamp; | |
c76c6956 PA |
1524 | tcp_cleanup_rbuf(ssk, 1); |
1525 | unlock_sock_fast(ssk, slow); | |
a6b118fe FW |
1526 | } |
1527 | } | |
1528 | } | |
1529 | ||
1530 | msk->rcvq_space.space = msk->rcvq_space.copied; | |
1531 | new_measure: | |
1532 | msk->rcvq_space.copied = 0; | |
1533 | msk->rcvq_space.time = mstamp; | |
1534 | } | |
1535 | ||
ea4ca586 | 1536 | static bool __mptcp_move_skbs(struct mptcp_sock *msk, unsigned int rcv) |
6771bfd9 FW |
1537 | { |
1538 | unsigned int moved = 0; | |
1539 | bool done; | |
1540 | ||
d5f49190 PA |
1541 | /* avoid looping forever below on racing close */ |
1542 | if (((struct sock *)msk)->sk_state == TCP_CLOSE) | |
1543 | return false; | |
1544 | ||
1545 | __mptcp_flush_join_list(msk); | |
6771bfd9 FW |
1546 | do { |
1547 | struct sock *ssk = mptcp_subflow_recv_lookup(msk); | |
65f49fe7 | 1548 | bool slowpath; |
6771bfd9 FW |
1549 | |
1550 | if (!ssk) | |
1551 | break; | |
1552 | ||
65f49fe7 | 1553 | slowpath = lock_sock_fast(ssk); |
6771bfd9 | 1554 | done = __mptcp_move_skbs_from_subflow(msk, ssk, &moved); |
ea4ca586 PA |
1555 | if (moved && rcv) { |
1556 | WRITE_ONCE(msk->rmem_pending, min(rcv, moved)); | |
1557 | tcp_cleanup_rbuf(ssk, 1); | |
1558 | WRITE_ONCE(msk->rmem_pending, 0); | |
1559 | } | |
65f49fe7 | 1560 | unlock_sock_fast(ssk, slowpath); |
6771bfd9 FW |
1561 | } while (!done); |
1562 | ||
ab174ad8 | 1563 | if (mptcp_ofo_queue(msk) || moved > 0) { |
ea4ca586 | 1564 | mptcp_check_data_fin((struct sock *)msk); |
ab174ad8 PA |
1565 | return true; |
1566 | } | |
1567 | return false; | |
6771bfd9 FW |
1568 | } |
1569 | ||
f870fa0b MM |
1570 | static int mptcp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, |
1571 | int nonblock, int flags, int *addr_len) | |
1572 | { | |
1573 | struct mptcp_sock *msk = mptcp_sk(sk); | |
cec37a6e | 1574 | int copied = 0; |
7a6a6cbc PA |
1575 | int target; |
1576 | long timeo; | |
f870fa0b MM |
1577 | |
1578 | if (msg->msg_flags & ~(MSG_WAITALL | MSG_DONTWAIT)) | |
1579 | return -EOPNOTSUPP; | |
1580 | ||
cec37a6e | 1581 | lock_sock(sk); |
7a6a6cbc PA |
1582 | timeo = sock_rcvtimeo(sk, nonblock); |
1583 | ||
1584 | len = min_t(size_t, len, INT_MAX); | |
1585 | target = sock_rcvlowat(sk, flags & MSG_WAITALL, len); | |
ec3edaa7 | 1586 | __mptcp_flush_join_list(msk); |
7a6a6cbc | 1587 | |
ea4ca586 PA |
1588 | for (;;) { |
1589 | int bytes_read, old_space; | |
7a6a6cbc | 1590 | |
6771bfd9 FW |
1591 | bytes_read = __mptcp_recvmsg_mskq(msk, msg, len - copied); |
1592 | if (unlikely(bytes_read < 0)) { | |
1593 | if (!copied) | |
1594 | copied = bytes_read; | |
1595 | goto out_err; | |
1596 | } | |
7a6a6cbc | 1597 | |
6771bfd9 | 1598 | copied += bytes_read; |
7a6a6cbc | 1599 | |
6771bfd9 | 1600 | if (skb_queue_empty(&sk->sk_receive_queue) && |
ea4ca586 | 1601 | __mptcp_move_skbs(msk, len - copied)) |
6771bfd9 | 1602 | continue; |
7a6a6cbc | 1603 | |
ea4ca586 PA |
1604 | /* be sure to advertise window change */ |
1605 | old_space = READ_ONCE(msk->old_wspace); | |
1606 | if ((tcp_space(sk) - old_space) >= old_space) | |
1607 | mptcp_send_ack(msk, false); | |
1608 | ||
7a6a6cbc PA |
1609 | /* only the master socket status is relevant here. The exit |
1610 | * conditions mirror closely tcp_recvmsg() | |
1611 | */ | |
1612 | if (copied >= target) | |
1613 | break; | |
1614 | ||
1615 | if (copied) { | |
1616 | if (sk->sk_err || | |
1617 | sk->sk_state == TCP_CLOSE || | |
1618 | (sk->sk_shutdown & RCV_SHUTDOWN) || | |
1619 | !timeo || | |
1620 | signal_pending(current)) | |
1621 | break; | |
1622 | } else { | |
1623 | if (sk->sk_err) { | |
1624 | copied = sock_error(sk); | |
1625 | break; | |
1626 | } | |
1627 | ||
5969856a PA |
1628 | if (test_and_clear_bit(MPTCP_WORK_EOF, &msk->flags)) |
1629 | mptcp_check_for_eof(msk); | |
1630 | ||
7a6a6cbc PA |
1631 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
1632 | break; | |
1633 | ||
1634 | if (sk->sk_state == TCP_CLOSE) { | |
1635 | copied = -ENOTCONN; | |
1636 | break; | |
1637 | } | |
1638 | ||
1639 | if (!timeo) { | |
1640 | copied = -EAGAIN; | |
1641 | break; | |
1642 | } | |
1643 | ||
1644 | if (signal_pending(current)) { | |
1645 | copied = sock_intr_errno(timeo); | |
1646 | break; | |
1647 | } | |
1648 | } | |
1649 | ||
1650 | pr_debug("block timeout %ld", timeo); | |
7a6a6cbc | 1651 | mptcp_wait_data(sk, &timeo); |
cec37a6e PK |
1652 | } |
1653 | ||
6771bfd9 FW |
1654 | if (skb_queue_empty(&sk->sk_receive_queue)) { |
1655 | /* entire backlog drained, clear DATA_READY. */ | |
7a6a6cbc | 1656 | clear_bit(MPTCP_DATA_READY, &msk->flags); |
cec37a6e | 1657 | |
6771bfd9 FW |
1658 | /* .. race-breaker: ssk might have gotten new data |
1659 | * after last __mptcp_move_skbs() returned false. | |
7a6a6cbc | 1660 | */ |
ea4ca586 | 1661 | if (unlikely(__mptcp_move_skbs(msk, 0))) |
7a6a6cbc | 1662 | set_bit(MPTCP_DATA_READY, &msk->flags); |
6771bfd9 FW |
1663 | } else if (unlikely(!test_bit(MPTCP_DATA_READY, &msk->flags))) { |
1664 | /* data to read but mptcp_wait_data() cleared DATA_READY */ | |
1665 | set_bit(MPTCP_DATA_READY, &msk->flags); | |
7a6a6cbc | 1666 | } |
6771bfd9 | 1667 | out_err: |
6719331c PA |
1668 | pr_debug("msk=%p data_ready=%d rx queue empty=%d copied=%d", |
1669 | msk, test_bit(MPTCP_DATA_READY, &msk->flags), | |
1670 | skb_queue_empty(&sk->sk_receive_queue), copied); | |
a6b118fe FW |
1671 | mptcp_rcv_space_adjust(msk, copied); |
1672 | ||
7a6a6cbc | 1673 | release_sock(sk); |
cec37a6e PK |
1674 | return copied; |
1675 | } | |
1676 | ||
b51f9b80 PA |
1677 | static void mptcp_retransmit_handler(struct sock *sk) |
1678 | { | |
1679 | struct mptcp_sock *msk = mptcp_sk(sk); | |
1680 | ||
eaa2ffab | 1681 | if (atomic64_read(&msk->snd_una) == READ_ONCE(msk->snd_nxt)) { |
b51f9b80 | 1682 | mptcp_stop_timer(sk); |
3b1d6210 PA |
1683 | } else { |
1684 | set_bit(MPTCP_WORK_RTX, &msk->flags); | |
ba8f48f7 | 1685 | mptcp_schedule_work(sk); |
3b1d6210 | 1686 | } |
b51f9b80 PA |
1687 | } |
1688 | ||
1689 | static void mptcp_retransmit_timer(struct timer_list *t) | |
1690 | { | |
1691 | struct inet_connection_sock *icsk = from_timer(icsk, t, | |
1692 | icsk_retransmit_timer); | |
1693 | struct sock *sk = &icsk->icsk_inet.sk; | |
1694 | ||
1695 | bh_lock_sock(sk); | |
1696 | if (!sock_owned_by_user(sk)) { | |
1697 | mptcp_retransmit_handler(sk); | |
1698 | } else { | |
1699 | /* delegate our work to tcp_release_cb() */ | |
1700 | if (!test_and_set_bit(TCP_WRITE_TIMER_DEFERRED, | |
1701 | &sk->sk_tsq_flags)) | |
1702 | sock_hold(sk); | |
1703 | } | |
1704 | bh_unlock_sock(sk); | |
1705 | sock_put(sk); | |
1706 | } | |
1707 | ||
e16163b6 PA |
1708 | static void mptcp_timeout_timer(struct timer_list *t) |
1709 | { | |
1710 | struct sock *sk = from_timer(sk, t, sk_timer); | |
1711 | ||
1712 | mptcp_schedule_work(sk); | |
b6d69fc8 | 1713 | sock_put(sk); |
e16163b6 PA |
1714 | } |
1715 | ||
3b1d6210 PA |
1716 | /* Find an idle subflow. Return NULL if there is unacked data at tcp |
1717 | * level. | |
1718 | * | |
1719 | * A backup subflow is returned only if that is the only kind available. | |
1720 | */ | |
1721 | static struct sock *mptcp_subflow_get_retrans(const struct mptcp_sock *msk) | |
1722 | { | |
1723 | struct mptcp_subflow_context *subflow; | |
1724 | struct sock *backup = NULL; | |
1725 | ||
1726 | sock_owned_by_me((const struct sock *)msk); | |
1727 | ||
d5f49190 | 1728 | if (__mptcp_check_fallback(msk)) |
d9ca1de8 | 1729 | return NULL; |
d5f49190 | 1730 | |
3b1d6210 PA |
1731 | mptcp_for_each_subflow(msk, subflow) { |
1732 | struct sock *ssk = mptcp_subflow_tcp_sock(subflow); | |
1733 | ||
d5f49190 PA |
1734 | if (!mptcp_subflow_active(subflow)) |
1735 | continue; | |
1736 | ||
3b1d6210 | 1737 | /* still data outstanding at TCP level? Don't retransmit. */ |
860975c6 FW |
1738 | if (!tcp_write_queue_empty(ssk)) { |
1739 | if (inet_csk(ssk)->icsk_ca_state >= TCP_CA_Loss) | |
1740 | continue; | |
3b1d6210 | 1741 | return NULL; |
860975c6 | 1742 | } |
3b1d6210 PA |
1743 | |
1744 | if (subflow->backup) { | |
1745 | if (!backup) | |
1746 | backup = ssk; | |
1747 | continue; | |
1748 | } | |
1749 | ||
1750 | return ssk; | |
1751 | } | |
1752 | ||
1753 | return backup; | |
1754 | } | |
1755 | ||
cec37a6e PK |
1756 | /* subflow sockets can be either outgoing (connect) or incoming |
1757 | * (accept). | |
1758 | * | |
1759 | * Outgoing subflows use in-kernel sockets. | |
1760 | * Incoming subflows do not have their own 'struct socket' allocated, | |
1761 | * so we need to use tcp_close() after detaching them from the mptcp | |
1762 | * parent socket. | |
1763 | */ | |
d0876b22 | 1764 | void __mptcp_close_ssk(struct sock *sk, struct sock *ssk, |
e16163b6 | 1765 | struct mptcp_subflow_context *subflow) |
cec37a6e | 1766 | { |
e16163b6 PA |
1767 | bool dispose_socket = false; |
1768 | struct socket *sock; | |
cec37a6e PK |
1769 | |
1770 | list_del(&subflow->node); | |
1771 | ||
e16163b6 PA |
1772 | lock_sock(ssk); |
1773 | ||
1774 | /* if we are invoked by the msk cleanup code, the subflow is | |
1775 | * already orphaned | |
1776 | */ | |
1777 | sock = ssk->sk_socket; | |
1778 | if (sock) { | |
1779 | dispose_socket = sock != sk->sk_socket; | |
1780 | sock_orphan(ssk); | |
1781 | } | |
1782 | ||
1783 | /* if ssk hit tcp_done(), tcp_cleanup_ulp() cleared the related ops | |
1784 | * the ssk has been already destroyed, we just need to release the | |
1785 | * reference owned by msk; | |
1786 | */ | |
1787 | if (!inet_csk(ssk)->icsk_ulp_ops) { | |
1788 | kfree_rcu(subflow, rcu); | |
cec37a6e | 1789 | } else { |
e16163b6 PA |
1790 | /* otherwise ask tcp do dispose of ssk and subflow ctx */ |
1791 | subflow->disposable = 1; | |
1792 | __tcp_close(ssk, 0); | |
1793 | ||
1794 | /* close acquired an extra ref */ | |
1795 | __sock_put(ssk); | |
cec37a6e | 1796 | } |
e16163b6 PA |
1797 | release_sock(ssk); |
1798 | if (dispose_socket) | |
1799 | iput(SOCK_INODE(sock)); | |
1800 | ||
1801 | sock_put(ssk); | |
f870fa0b MM |
1802 | } |
1803 | ||
dc24f8b4 PA |
1804 | static unsigned int mptcp_sync_mss(struct sock *sk, u32 pmtu) |
1805 | { | |
1806 | return 0; | |
1807 | } | |
1808 | ||
b416268b FW |
1809 | static void pm_work(struct mptcp_sock *msk) |
1810 | { | |
1811 | struct mptcp_pm_data *pm = &msk->pm; | |
1812 | ||
1813 | spin_lock_bh(&msk->pm.lock); | |
1814 | ||
1815 | pr_debug("msk=%p status=%x", msk, pm->status); | |
1816 | if (pm->status & BIT(MPTCP_PM_ADD_ADDR_RECEIVED)) { | |
1817 | pm->status &= ~BIT(MPTCP_PM_ADD_ADDR_RECEIVED); | |
1818 | mptcp_pm_nl_add_addr_received(msk); | |
1819 | } | |
84dfe367 GT |
1820 | if (pm->status & BIT(MPTCP_PM_ADD_ADDR_SEND_ACK)) { |
1821 | pm->status &= ~BIT(MPTCP_PM_ADD_ADDR_SEND_ACK); | |
1822 | mptcp_pm_nl_add_addr_send_ack(msk); | |
1823 | } | |
d0876b22 GT |
1824 | if (pm->status & BIT(MPTCP_PM_RM_ADDR_RECEIVED)) { |
1825 | pm->status &= ~BIT(MPTCP_PM_RM_ADDR_RECEIVED); | |
1826 | mptcp_pm_nl_rm_addr_received(msk); | |
1827 | } | |
b416268b FW |
1828 | if (pm->status & BIT(MPTCP_PM_ESTABLISHED)) { |
1829 | pm->status &= ~BIT(MPTCP_PM_ESTABLISHED); | |
1830 | mptcp_pm_nl_fully_established(msk); | |
1831 | } | |
1832 | if (pm->status & BIT(MPTCP_PM_SUBFLOW_ESTABLISHED)) { | |
1833 | pm->status &= ~BIT(MPTCP_PM_SUBFLOW_ESTABLISHED); | |
1834 | mptcp_pm_nl_subflow_established(msk); | |
1835 | } | |
1836 | ||
1837 | spin_unlock_bh(&msk->pm.lock); | |
1838 | } | |
1839 | ||
0e4f35d7 PA |
1840 | static void __mptcp_close_subflow(struct mptcp_sock *msk) |
1841 | { | |
1842 | struct mptcp_subflow_context *subflow, *tmp; | |
1843 | ||
1844 | list_for_each_entry_safe(subflow, tmp, &msk->conn_list, node) { | |
1845 | struct sock *ssk = mptcp_subflow_tcp_sock(subflow); | |
1846 | ||
1847 | if (inet_sk_state_load(ssk) != TCP_CLOSE) | |
1848 | continue; | |
1849 | ||
e16163b6 | 1850 | __mptcp_close_ssk((struct sock *)msk, ssk, subflow); |
0e4f35d7 PA |
1851 | } |
1852 | } | |
1853 | ||
e16163b6 PA |
1854 | static bool mptcp_check_close_timeout(const struct sock *sk) |
1855 | { | |
1856 | s32 delta = tcp_jiffies32 - inet_csk(sk)->icsk_mtup.probe_timestamp; | |
1857 | struct mptcp_subflow_context *subflow; | |
1858 | ||
1859 | if (delta >= TCP_TIMEWAIT_LEN) | |
1860 | return true; | |
1861 | ||
1862 | /* if all subflows are in closed status don't bother with additional | |
1863 | * timeout | |
1864 | */ | |
1865 | mptcp_for_each_subflow(mptcp_sk(sk), subflow) { | |
1866 | if (inet_sk_state_load(mptcp_subflow_tcp_sock(subflow)) != | |
1867 | TCP_CLOSE) | |
1868 | return false; | |
1869 | } | |
1870 | return true; | |
1871 | } | |
1872 | ||
80992017 PA |
1873 | static void mptcp_worker(struct work_struct *work) |
1874 | { | |
1875 | struct mptcp_sock *msk = container_of(work, struct mptcp_sock, work); | |
3b1d6210 | 1876 | struct sock *ssk, *sk = &msk->sk.icsk_inet.sk; |
caf971df | 1877 | struct mptcp_sendmsg_info info = {}; |
3b1d6210 | 1878 | struct mptcp_data_frag *dfrag; |
3b1d6210 | 1879 | size_t copied = 0; |
e16163b6 | 1880 | int state, ret; |
80992017 PA |
1881 | |
1882 | lock_sock(sk); | |
e16163b6 PA |
1883 | state = sk->sk_state; |
1884 | if (unlikely(state == TCP_CLOSE)) | |
1885 | goto unlock; | |
1886 | ||
95ed690e | 1887 | mptcp_clean_una_wakeup(sk); |
43b54c6e | 1888 | mptcp_check_data_fin_ack(sk); |
ec3edaa7 | 1889 | __mptcp_flush_join_list(msk); |
0e4f35d7 PA |
1890 | if (test_and_clear_bit(MPTCP_WORK_CLOSE_SUBFLOW, &msk->flags)) |
1891 | __mptcp_close_subflow(msk); | |
1892 | ||
813e0a68 PA |
1893 | if (mptcp_send_head(sk)) |
1894 | mptcp_push_pending(sk, 0); | |
3b1d6210 | 1895 | |
b416268b FW |
1896 | if (msk->pm.status) |
1897 | pm_work(msk); | |
1898 | ||
59832e24 FW |
1899 | if (test_and_clear_bit(MPTCP_WORK_EOF, &msk->flags)) |
1900 | mptcp_check_for_eof(msk); | |
1901 | ||
43b54c6e MM |
1902 | mptcp_check_data_fin(sk); |
1903 | ||
e16163b6 PA |
1904 | /* if the msk data is completely acked, or the socket timedout, |
1905 | * there is no point in keeping around an orphaned sk | |
1906 | */ | |
1907 | if (sock_flag(sk, SOCK_DEAD) && | |
1908 | (mptcp_check_close_timeout(sk) || | |
1909 | (state != sk->sk_state && | |
1910 | ((1 << inet_sk_state_load(sk)) & (TCPF_CLOSE | TCPF_FIN_WAIT2))))) { | |
1911 | inet_sk_state_store(sk, TCP_CLOSE); | |
1912 | __mptcp_destroy_sock(sk); | |
1913 | goto unlock; | |
1914 | } | |
1915 | ||
3b1d6210 PA |
1916 | if (!test_and_clear_bit(MPTCP_WORK_RTX, &msk->flags)) |
1917 | goto unlock; | |
1918 | ||
1919 | dfrag = mptcp_rtx_head(sk); | |
1920 | if (!dfrag) | |
1921 | goto unlock; | |
1922 | ||
149f7c71 FW |
1923 | if (!mptcp_ext_cache_refill(msk)) |
1924 | goto reset_unlock; | |
1925 | ||
3b1d6210 PA |
1926 | ssk = mptcp_subflow_get_retrans(msk); |
1927 | if (!ssk) | |
1928 | goto reset_unlock; | |
1929 | ||
1930 | lock_sock(ssk); | |
1931 | ||
d9ca1de8 PA |
1932 | /* limit retransmission to the bytes already sent on some subflows */ |
1933 | info.sent = 0; | |
1934 | info.limit = dfrag->already_sent; | |
1935 | while (info.sent < dfrag->already_sent) { | |
1936 | ret = mptcp_sendmsg_frag(sk, ssk, dfrag, &info); | |
6f8a612a | 1937 | if (ret <= 0) |
3b1d6210 PA |
1938 | break; |
1939 | ||
fc518953 | 1940 | MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_RETRANSSEGS); |
3b1d6210 | 1941 | copied += ret; |
d9ca1de8 | 1942 | info.sent += ret; |
149f7c71 FW |
1943 | |
1944 | if (!mptcp_ext_cache_refill(msk)) | |
1945 | break; | |
3b1d6210 PA |
1946 | } |
1947 | if (copied) | |
caf971df PA |
1948 | tcp_push(ssk, 0, info.mss_now, tcp_sk(ssk)->nonagle, |
1949 | info.size_goal); | |
3b1d6210 | 1950 | |
3b1d6210 PA |
1951 | mptcp_set_timeout(sk, ssk); |
1952 | release_sock(ssk); | |
1953 | ||
1954 | reset_unlock: | |
1955 | if (!mptcp_timer_pending(sk)) | |
1956 | mptcp_reset_timer(sk); | |
1957 | ||
1958 | unlock: | |
80992017 PA |
1959 | release_sock(sk); |
1960 | sock_put(sk); | |
1961 | } | |
1962 | ||
784325e9 | 1963 | static int __mptcp_init_sock(struct sock *sk) |
f870fa0b | 1964 | { |
cec37a6e PK |
1965 | struct mptcp_sock *msk = mptcp_sk(sk); |
1966 | ||
ec3edaa7 PK |
1967 | spin_lock_init(&msk->join_list_lock); |
1968 | ||
cec37a6e | 1969 | INIT_LIST_HEAD(&msk->conn_list); |
ec3edaa7 | 1970 | INIT_LIST_HEAD(&msk->join_list); |
18b683bf | 1971 | INIT_LIST_HEAD(&msk->rtx_queue); |
80992017 | 1972 | INIT_WORK(&msk->work, mptcp_worker); |
ab174ad8 | 1973 | msk->out_of_order_queue = RB_ROOT; |
f0e6a4cf | 1974 | msk->first_pending = NULL; |
cec37a6e | 1975 | |
ea4ca586 | 1976 | msk->ack_hint = NULL; |
8ab183de | 1977 | msk->first = NULL; |
dc24f8b4 | 1978 | inet_csk(sk)->icsk_sync_mss = mptcp_sync_mss; |
8ab183de | 1979 | |
1b1c7a0e PK |
1980 | mptcp_pm_data_init(msk); |
1981 | ||
b51f9b80 PA |
1982 | /* re-use the csk retrans timer for MPTCP-level retrans */ |
1983 | timer_setup(&msk->sk.icsk_retransmit_timer, mptcp_retransmit_timer, 0); | |
e16163b6 | 1984 | timer_setup(&sk->sk_timer, mptcp_timeout_timer, 0); |
f870fa0b MM |
1985 | return 0; |
1986 | } | |
1987 | ||
784325e9 MB |
1988 | static int mptcp_init_sock(struct sock *sk) |
1989 | { | |
fc518953 FW |
1990 | struct net *net = sock_net(sk); |
1991 | int ret; | |
18b683bf | 1992 | |
b6c08380 GT |
1993 | ret = __mptcp_init_sock(sk); |
1994 | if (ret) | |
1995 | return ret; | |
1996 | ||
fc518953 FW |
1997 | if (!mptcp_is_enabled(net)) |
1998 | return -ENOPROTOOPT; | |
1999 | ||
2000 | if (unlikely(!net->mib.mptcp_statistics) && !mptcp_mib_alloc(net)) | |
2001 | return -ENOMEM; | |
2002 | ||
fa68018d PA |
2003 | ret = __mptcp_socket_create(mptcp_sk(sk)); |
2004 | if (ret) | |
2005 | return ret; | |
2006 | ||
d027236c | 2007 | sk_sockets_allocated_inc(sk); |
a6b118fe | 2008 | sk->sk_rcvbuf = sock_net(sk)->ipv4.sysctl_tcp_rmem[1]; |
da51aef5 | 2009 | sk->sk_sndbuf = sock_net(sk)->ipv4.sysctl_tcp_wmem[1]; |
d027236c | 2010 | |
18b683bf PA |
2011 | return 0; |
2012 | } | |
2013 | ||
2014 | static void __mptcp_clear_xmit(struct sock *sk) | |
2015 | { | |
2016 | struct mptcp_sock *msk = mptcp_sk(sk); | |
2017 | struct mptcp_data_frag *dtmp, *dfrag; | |
2018 | ||
b51f9b80 PA |
2019 | sk_stop_timer(sk, &msk->sk.icsk_retransmit_timer); |
2020 | ||
d9ca1de8 | 2021 | WRITE_ONCE(msk->first_pending, NULL); |
18b683bf | 2022 | list_for_each_entry_safe(dfrag, dtmp, &msk->rtx_queue, list) |
d027236c | 2023 | dfrag_clear(sk, dfrag); |
784325e9 MB |
2024 | } |
2025 | ||
80992017 PA |
2026 | static void mptcp_cancel_work(struct sock *sk) |
2027 | { | |
2028 | struct mptcp_sock *msk = mptcp_sk(sk); | |
2029 | ||
b2771d24 | 2030 | if (cancel_work_sync(&msk->work)) |
e16163b6 | 2031 | __sock_put(sk); |
80992017 PA |
2032 | } |
2033 | ||
d0876b22 | 2034 | void mptcp_subflow_shutdown(struct sock *sk, struct sock *ssk, int how) |
21498490 PK |
2035 | { |
2036 | lock_sock(ssk); | |
2037 | ||
2038 | switch (ssk->sk_state) { | |
2039 | case TCP_LISTEN: | |
2040 | if (!(how & RCV_SHUTDOWN)) | |
2041 | break; | |
df561f66 | 2042 | fallthrough; |
21498490 PK |
2043 | case TCP_SYN_SENT: |
2044 | tcp_disconnect(ssk, O_NONBLOCK); | |
2045 | break; | |
2046 | default: | |
43b54c6e MM |
2047 | if (__mptcp_check_fallback(mptcp_sk(sk))) { |
2048 | pr_debug("Fallback"); | |
2049 | ssk->sk_shutdown |= how; | |
2050 | tcp_shutdown(ssk, how); | |
2051 | } else { | |
2052 | pr_debug("Sending DATA_FIN on subflow %p", ssk); | |
2053 | mptcp_set_timeout(sk, ssk); | |
2054 | tcp_send_ack(ssk); | |
2055 | } | |
21498490 PK |
2056 | break; |
2057 | } | |
2058 | ||
21498490 PK |
2059 | release_sock(ssk); |
2060 | } | |
2061 | ||
6920b851 MM |
2062 | static const unsigned char new_state[16] = { |
2063 | /* current state: new state: action: */ | |
2064 | [0 /* (Invalid) */] = TCP_CLOSE, | |
2065 | [TCP_ESTABLISHED] = TCP_FIN_WAIT1 | TCP_ACTION_FIN, | |
2066 | [TCP_SYN_SENT] = TCP_CLOSE, | |
2067 | [TCP_SYN_RECV] = TCP_FIN_WAIT1 | TCP_ACTION_FIN, | |
2068 | [TCP_FIN_WAIT1] = TCP_FIN_WAIT1, | |
2069 | [TCP_FIN_WAIT2] = TCP_FIN_WAIT2, | |
2070 | [TCP_TIME_WAIT] = TCP_CLOSE, /* should not happen ! */ | |
2071 | [TCP_CLOSE] = TCP_CLOSE, | |
2072 | [TCP_CLOSE_WAIT] = TCP_LAST_ACK | TCP_ACTION_FIN, | |
2073 | [TCP_LAST_ACK] = TCP_LAST_ACK, | |
2074 | [TCP_LISTEN] = TCP_CLOSE, | |
2075 | [TCP_CLOSING] = TCP_CLOSING, | |
2076 | [TCP_NEW_SYN_RECV] = TCP_CLOSE, /* should not happen ! */ | |
2077 | }; | |
2078 | ||
2079 | static int mptcp_close_state(struct sock *sk) | |
2080 | { | |
2081 | int next = (int)new_state[sk->sk_state]; | |
2082 | int ns = next & TCP_STATE_MASK; | |
2083 | ||
2084 | inet_sk_state_store(sk, ns); | |
2085 | ||
2086 | return next & TCP_ACTION_FIN; | |
2087 | } | |
2088 | ||
e16163b6 | 2089 | static void __mptcp_check_send_data_fin(struct sock *sk) |
f870fa0b | 2090 | { |
e16163b6 | 2091 | struct mptcp_subflow_context *subflow; |
f870fa0b MM |
2092 | struct mptcp_sock *msk = mptcp_sk(sk); |
2093 | ||
e16163b6 PA |
2094 | pr_debug("msk=%p snd_data_fin_enable=%d pending=%d snd_nxt=%llu write_seq=%llu", |
2095 | msk, msk->snd_data_fin_enable, !!mptcp_send_head(sk), | |
2096 | msk->snd_nxt, msk->write_seq); | |
43b54c6e | 2097 | |
e16163b6 PA |
2098 | /* we still need to enqueue subflows or not really shutting down, |
2099 | * skip this | |
2100 | */ | |
2101 | if (!msk->snd_data_fin_enable || msk->snd_nxt + 1 != msk->write_seq || | |
2102 | mptcp_send_head(sk)) | |
2103 | return; | |
2104 | ||
2105 | WRITE_ONCE(msk->snd_nxt, msk->write_seq); | |
2106 | ||
26aa2314 PA |
2107 | /* fallback socket will not get data_fin/ack, can move to the next |
2108 | * state now | |
2109 | */ | |
2110 | if (__mptcp_check_fallback(msk)) { | |
2111 | if ((1 << sk->sk_state) & (TCPF_CLOSING | TCPF_LAST_ACK)) { | |
2112 | inet_sk_state_store(sk, TCP_CLOSE); | |
2113 | mptcp_close_wake_up(sk); | |
2114 | } else if (sk->sk_state == TCP_FIN_WAIT1) { | |
2115 | inet_sk_state_store(sk, TCP_FIN_WAIT2); | |
2116 | } | |
43b54c6e MM |
2117 | } |
2118 | ||
e16163b6 PA |
2119 | __mptcp_flush_join_list(msk); |
2120 | mptcp_for_each_subflow(msk, subflow) { | |
2121 | struct sock *tcp_sk = mptcp_subflow_tcp_sock(subflow); | |
43b54c6e | 2122 | |
e16163b6 | 2123 | mptcp_subflow_shutdown(sk, tcp_sk, SEND_SHUTDOWN); |
43b54c6e | 2124 | } |
e16163b6 | 2125 | } |
2c22c06c | 2126 | |
e16163b6 PA |
2127 | static void __mptcp_wr_shutdown(struct sock *sk) |
2128 | { | |
2129 | struct mptcp_sock *msk = mptcp_sk(sk); | |
43b54c6e | 2130 | |
e16163b6 PA |
2131 | pr_debug("msk=%p snd_data_fin_enable=%d shutdown=%x state=%d pending=%d", |
2132 | msk, msk->snd_data_fin_enable, sk->sk_shutdown, sk->sk_state, | |
2133 | !!mptcp_send_head(sk)); | |
2134 | ||
2135 | /* will be ignored by fallback sockets */ | |
2136 | WRITE_ONCE(msk->write_seq, msk->write_seq + 1); | |
2137 | WRITE_ONCE(msk->snd_data_fin_enable, 1); | |
2138 | ||
2139 | __mptcp_check_send_data_fin(sk); | |
2140 | } | |
2141 | ||
2142 | static void __mptcp_destroy_sock(struct sock *sk) | |
2143 | { | |
2144 | struct mptcp_subflow_context *subflow, *tmp; | |
2145 | struct mptcp_sock *msk = mptcp_sk(sk); | |
2146 | LIST_HEAD(conn_list); | |
2147 | ||
2148 | pr_debug("msk=%p", msk); | |
f870fa0b | 2149 | |
10f6d46c PA |
2150 | /* be sure to always acquire the join list lock, to sync vs |
2151 | * mptcp_finish_join(). | |
2152 | */ | |
2153 | spin_lock_bh(&msk->join_list_lock); | |
2154 | list_splice_tail_init(&msk->join_list, &msk->conn_list); | |
2155 | spin_unlock_bh(&msk->join_list_lock); | |
b2c5b614 FW |
2156 | list_splice_init(&msk->conn_list, &conn_list); |
2157 | ||
18b683bf | 2158 | __mptcp_clear_xmit(sk); |
e16163b6 PA |
2159 | sk_stop_timer(sk, &sk->sk_timer); |
2160 | msk->pm.status = 0; | |
b2c5b614 FW |
2161 | |
2162 | list_for_each_entry_safe(subflow, tmp, &conn_list, node) { | |
cec37a6e | 2163 | struct sock *ssk = mptcp_subflow_tcp_sock(subflow); |
e16163b6 | 2164 | __mptcp_close_ssk(sk, ssk, subflow); |
f870fa0b MM |
2165 | } |
2166 | ||
e16163b6 | 2167 | sk->sk_prot->destroy(sk); |
80992017 | 2168 | |
e16163b6 PA |
2169 | sk_stream_kill_queues(sk); |
2170 | xfrm_sk_free_policy(sk); | |
2171 | sk_refcnt_debug_release(sk); | |
2172 | sock_put(sk); | |
2173 | } | |
2174 | ||
2175 | static void mptcp_close(struct sock *sk, long timeout) | |
2176 | { | |
2177 | struct mptcp_subflow_context *subflow; | |
2178 | bool do_cancel_work = false; | |
2179 | ||
2180 | lock_sock(sk); | |
2181 | sk->sk_shutdown = SHUTDOWN_MASK; | |
2182 | ||
2183 | if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) { | |
2184 | inet_sk_state_store(sk, TCP_CLOSE); | |
2185 | goto cleanup; | |
2186 | } | |
6771bfd9 | 2187 | |
e16163b6 PA |
2188 | if (mptcp_close_state(sk)) |
2189 | __mptcp_wr_shutdown(sk); | |
2190 | ||
2191 | sk_stream_wait_close(sk, timeout); | |
2192 | ||
2193 | cleanup: | |
2194 | /* orphan all the subflows */ | |
2195 | inet_csk(sk)->icsk_mtup.probe_timestamp = tcp_jiffies32; | |
2196 | list_for_each_entry(subflow, &mptcp_sk(sk)->conn_list, node) { | |
2197 | struct sock *ssk = mptcp_subflow_tcp_sock(subflow); | |
2198 | bool slow, dispose_socket; | |
2199 | struct socket *sock; | |
2200 | ||
2201 | slow = lock_sock_fast(ssk); | |
2202 | sock = ssk->sk_socket; | |
2203 | dispose_socket = sock && sock != sk->sk_socket; | |
2204 | sock_orphan(ssk); | |
2205 | unlock_sock_fast(ssk, slow); | |
2206 | ||
2207 | /* for the outgoing subflows we additionally need to free | |
2208 | * the associated socket | |
2209 | */ | |
2210 | if (dispose_socket) | |
2211 | iput(SOCK_INODE(sock)); | |
2212 | } | |
2213 | sock_orphan(sk); | |
2214 | ||
2215 | sock_hold(sk); | |
2216 | pr_debug("msk=%p state=%d", sk, sk->sk_state); | |
2217 | if (sk->sk_state == TCP_CLOSE) { | |
2218 | __mptcp_destroy_sock(sk); | |
2219 | do_cancel_work = true; | |
2220 | } else { | |
2221 | sk_reset_timer(sk, &sk->sk_timer, jiffies + TCP_TIMEWAIT_LEN); | |
2222 | } | |
2223 | release_sock(sk); | |
2224 | if (do_cancel_work) | |
2225 | mptcp_cancel_work(sk); | |
2226 | sock_put(sk); | |
f870fa0b MM |
2227 | } |
2228 | ||
cf7da0d6 PK |
2229 | static void mptcp_copy_inaddrs(struct sock *msk, const struct sock *ssk) |
2230 | { | |
2231 | #if IS_ENABLED(CONFIG_MPTCP_IPV6) | |
2232 | const struct ipv6_pinfo *ssk6 = inet6_sk(ssk); | |
2233 | struct ipv6_pinfo *msk6 = inet6_sk(msk); | |
2234 | ||
2235 | msk->sk_v6_daddr = ssk->sk_v6_daddr; | |
2236 | msk->sk_v6_rcv_saddr = ssk->sk_v6_rcv_saddr; | |
2237 | ||
2238 | if (msk6 && ssk6) { | |
2239 | msk6->saddr = ssk6->saddr; | |
2240 | msk6->flow_label = ssk6->flow_label; | |
2241 | } | |
2242 | #endif | |
2243 | ||
2244 | inet_sk(msk)->inet_num = inet_sk(ssk)->inet_num; | |
2245 | inet_sk(msk)->inet_dport = inet_sk(ssk)->inet_dport; | |
2246 | inet_sk(msk)->inet_sport = inet_sk(ssk)->inet_sport; | |
2247 | inet_sk(msk)->inet_daddr = inet_sk(ssk)->inet_daddr; | |
2248 | inet_sk(msk)->inet_saddr = inet_sk(ssk)->inet_saddr; | |
2249 | inet_sk(msk)->inet_rcv_saddr = inet_sk(ssk)->inet_rcv_saddr; | |
2250 | } | |
2251 | ||
18b683bf PA |
2252 | static int mptcp_disconnect(struct sock *sk, int flags) |
2253 | { | |
42c556fe FW |
2254 | /* Should never be called. |
2255 | * inet_stream_connect() calls ->disconnect, but that | |
2256 | * refers to the subflow socket, not the mptcp one. | |
2257 | */ | |
2258 | WARN_ON_ONCE(1); | |
2259 | return 0; | |
18b683bf PA |
2260 | } |
2261 | ||
b0519de8 FW |
2262 | #if IS_ENABLED(CONFIG_MPTCP_IPV6) |
2263 | static struct ipv6_pinfo *mptcp_inet6_sk(const struct sock *sk) | |
2264 | { | |
2265 | unsigned int offset = sizeof(struct mptcp6_sock) - sizeof(struct ipv6_pinfo); | |
2266 | ||
2267 | return (struct ipv6_pinfo *)(((u8 *)sk) + offset); | |
2268 | } | |
2269 | #endif | |
2270 | ||
fca5c82c | 2271 | struct sock *mptcp_sk_clone(const struct sock *sk, |
cfde141e | 2272 | const struct mptcp_options_received *mp_opt, |
fca5c82c | 2273 | struct request_sock *req) |
b0519de8 | 2274 | { |
58b09919 | 2275 | struct mptcp_subflow_request_sock *subflow_req = mptcp_subflow_rsk(req); |
b0519de8 | 2276 | struct sock *nsk = sk_clone_lock(sk, GFP_ATOMIC); |
58b09919 PA |
2277 | struct mptcp_sock *msk; |
2278 | u64 ack_seq; | |
b0519de8 FW |
2279 | |
2280 | if (!nsk) | |
2281 | return NULL; | |
2282 | ||
2283 | #if IS_ENABLED(CONFIG_MPTCP_IPV6) | |
2284 | if (nsk->sk_family == AF_INET6) | |
2285 | inet_sk(nsk)->pinet6 = mptcp_inet6_sk(nsk); | |
2286 | #endif | |
2287 | ||
58b09919 PA |
2288 | __mptcp_init_sock(nsk); |
2289 | ||
2290 | msk = mptcp_sk(nsk); | |
2291 | msk->local_key = subflow_req->local_key; | |
2292 | msk->token = subflow_req->token; | |
2293 | msk->subflow = NULL; | |
b93df08c | 2294 | WRITE_ONCE(msk->fully_established, false); |
58b09919 | 2295 | |
58b09919 | 2296 | msk->write_seq = subflow_req->idsn + 1; |
eaa2ffab | 2297 | msk->snd_nxt = msk->write_seq; |
cc9d2566 | 2298 | atomic64_set(&msk->snd_una, msk->write_seq); |
6f8a612a FW |
2299 | atomic64_set(&msk->wnd_end, msk->snd_nxt + req->rsk_rcv_wnd); |
2300 | ||
cfde141e | 2301 | if (mp_opt->mp_capable) { |
58b09919 | 2302 | msk->can_ack = true; |
cfde141e | 2303 | msk->remote_key = mp_opt->sndr_key; |
58b09919 PA |
2304 | mptcp_crypto_key_sha(msk->remote_key, NULL, &ack_seq); |
2305 | ack_seq++; | |
917944da | 2306 | WRITE_ONCE(msk->ack_seq, ack_seq); |
fa3fe2b1 | 2307 | WRITE_ONCE(msk->rcv_wnd_sent, ack_seq); |
58b09919 | 2308 | } |
7f20d5fc | 2309 | |
5e20087d | 2310 | sock_reset_flag(nsk, SOCK_RCU_FREE); |
7f20d5fc PA |
2311 | /* will be fully established after successful MPC subflow creation */ |
2312 | inet_sk_state_store(nsk, TCP_SYN_RECV); | |
58b09919 PA |
2313 | bh_unlock_sock(nsk); |
2314 | ||
2315 | /* keep a single reference */ | |
2316 | __sock_put(nsk); | |
b0519de8 FW |
2317 | return nsk; |
2318 | } | |
2319 | ||
a6b118fe FW |
2320 | void mptcp_rcv_space_init(struct mptcp_sock *msk, const struct sock *ssk) |
2321 | { | |
2322 | const struct tcp_sock *tp = tcp_sk(ssk); | |
2323 | ||
2324 | msk->rcvq_space.copied = 0; | |
2325 | msk->rcvq_space.rtt_us = 0; | |
2326 | ||
2327 | msk->rcvq_space.time = tp->tcp_mstamp; | |
2328 | ||
2329 | /* initial rcv_space offering made to peer */ | |
2330 | msk->rcvq_space.space = min_t(u32, tp->rcv_wnd, | |
2331 | TCP_INIT_CWND * tp->advmss); | |
2332 | if (msk->rcvq_space.space == 0) | |
2333 | msk->rcvq_space.space = TCP_INIT_CWND * TCP_MSS_DEFAULT; | |
6f8a612a FW |
2334 | |
2335 | atomic64_set(&msk->wnd_end, msk->snd_nxt + tcp_sk(ssk)->snd_wnd); | |
a6b118fe FW |
2336 | } |
2337 | ||
cf7da0d6 PK |
2338 | static struct sock *mptcp_accept(struct sock *sk, int flags, int *err, |
2339 | bool kern) | |
2340 | { | |
2341 | struct mptcp_sock *msk = mptcp_sk(sk); | |
2342 | struct socket *listener; | |
2343 | struct sock *newsk; | |
2344 | ||
2345 | listener = __mptcp_nmpc_socket(msk); | |
2346 | if (WARN_ON_ONCE(!listener)) { | |
2347 | *err = -EINVAL; | |
2348 | return NULL; | |
2349 | } | |
2350 | ||
2351 | pr_debug("msk=%p, listener=%p", msk, mptcp_subflow_ctx(listener->sk)); | |
2352 | newsk = inet_csk_accept(listener->sk, flags, err, kern); | |
2353 | if (!newsk) | |
2354 | return NULL; | |
2355 | ||
2356 | pr_debug("msk=%p, subflow is mptcp=%d", msk, sk_is_mptcp(newsk)); | |
cf7da0d6 PK |
2357 | if (sk_is_mptcp(newsk)) { |
2358 | struct mptcp_subflow_context *subflow; | |
2359 | struct sock *new_mptcp_sock; | |
cf7da0d6 PK |
2360 | |
2361 | subflow = mptcp_subflow_ctx(newsk); | |
58b09919 | 2362 | new_mptcp_sock = subflow->conn; |
cf7da0d6 | 2363 | |
58b09919 PA |
2364 | /* is_mptcp should be false if subflow->conn is missing, see |
2365 | * subflow_syn_recv_sock() | |
2366 | */ | |
2367 | if (WARN_ON_ONCE(!new_mptcp_sock)) { | |
2368 | tcp_sk(newsk)->is_mptcp = 0; | |
2369 | return newsk; | |
cf7da0d6 PK |
2370 | } |
2371 | ||
58b09919 PA |
2372 | /* acquire the 2nd reference for the owning socket */ |
2373 | sock_hold(new_mptcp_sock); | |
cf7da0d6 | 2374 | newsk = new_mptcp_sock; |
0397c6d8 | 2375 | MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_MPCAPABLEPASSIVEACK); |
fc518953 FW |
2376 | } else { |
2377 | MPTCP_INC_STATS(sock_net(sk), | |
2378 | MPTCP_MIB_MPCAPABLEPASSIVEFALLBACK); | |
cf7da0d6 PK |
2379 | } |
2380 | ||
2381 | return newsk; | |
2382 | } | |
2383 | ||
5c8c1640 GT |
2384 | void mptcp_destroy_common(struct mptcp_sock *msk) |
2385 | { | |
2386 | skb_rbtree_purge(&msk->out_of_order_queue); | |
2387 | mptcp_token_destroy(msk); | |
2388 | mptcp_pm_free_anno_list(msk); | |
2389 | } | |
2390 | ||
79c0949e PK |
2391 | static void mptcp_destroy(struct sock *sk) |
2392 | { | |
c9fd9c5f FW |
2393 | struct mptcp_sock *msk = mptcp_sk(sk); |
2394 | ||
2395 | if (msk->cached_ext) | |
2396 | __skb_ext_put(msk->cached_ext); | |
d027236c | 2397 | |
5c8c1640 | 2398 | mptcp_destroy_common(msk); |
d027236c | 2399 | sk_sockets_allocated_dec(sk); |
79c0949e PK |
2400 | } |
2401 | ||
fd1452d8 | 2402 | static int mptcp_setsockopt_sol_socket(struct mptcp_sock *msk, int optname, |
a7b75c5a | 2403 | sockptr_t optval, unsigned int optlen) |
fd1452d8 FW |
2404 | { |
2405 | struct sock *sk = (struct sock *)msk; | |
2406 | struct socket *ssock; | |
2407 | int ret; | |
2408 | ||
2409 | switch (optname) { | |
2410 | case SO_REUSEPORT: | |
2411 | case SO_REUSEADDR: | |
2412 | lock_sock(sk); | |
2413 | ssock = __mptcp_nmpc_socket(msk); | |
2414 | if (!ssock) { | |
2415 | release_sock(sk); | |
2416 | return -EINVAL; | |
2417 | } | |
2418 | ||
a7b75c5a | 2419 | ret = sock_setsockopt(ssock, SOL_SOCKET, optname, optval, optlen); |
fd1452d8 FW |
2420 | if (ret == 0) { |
2421 | if (optname == SO_REUSEPORT) | |
2422 | sk->sk_reuseport = ssock->sk->sk_reuseport; | |
2423 | else if (optname == SO_REUSEADDR) | |
2424 | sk->sk_reuse = ssock->sk->sk_reuse; | |
2425 | } | |
2426 | release_sock(sk); | |
2427 | return ret; | |
2428 | } | |
2429 | ||
a7b75c5a | 2430 | return sock_setsockopt(sk->sk_socket, SOL_SOCKET, optname, optval, optlen); |
fd1452d8 FW |
2431 | } |
2432 | ||
c9b95a13 | 2433 | static int mptcp_setsockopt_v6(struct mptcp_sock *msk, int optname, |
a7b75c5a | 2434 | sockptr_t optval, unsigned int optlen) |
c9b95a13 FW |
2435 | { |
2436 | struct sock *sk = (struct sock *)msk; | |
2437 | int ret = -EOPNOTSUPP; | |
2438 | struct socket *ssock; | |
2439 | ||
2440 | switch (optname) { | |
2441 | case IPV6_V6ONLY: | |
2442 | lock_sock(sk); | |
2443 | ssock = __mptcp_nmpc_socket(msk); | |
2444 | if (!ssock) { | |
2445 | release_sock(sk); | |
2446 | return -EINVAL; | |
2447 | } | |
2448 | ||
2449 | ret = tcp_setsockopt(ssock->sk, SOL_IPV6, optname, optval, optlen); | |
2450 | if (ret == 0) | |
2451 | sk->sk_ipv6only = ssock->sk->sk_ipv6only; | |
2452 | ||
2453 | release_sock(sk); | |
2454 | break; | |
2455 | } | |
2456 | ||
2457 | return ret; | |
2458 | } | |
2459 | ||
717e79c8 | 2460 | static int mptcp_setsockopt(struct sock *sk, int level, int optname, |
a7b75c5a | 2461 | sockptr_t optval, unsigned int optlen) |
717e79c8 PK |
2462 | { |
2463 | struct mptcp_sock *msk = mptcp_sk(sk); | |
76660afb | 2464 | struct sock *ssk; |
717e79c8 PK |
2465 | |
2466 | pr_debug("msk=%p", msk); | |
2467 | ||
83f0c10b | 2468 | if (level == SOL_SOCKET) |
fd1452d8 | 2469 | return mptcp_setsockopt_sol_socket(msk, optname, optval, optlen); |
83f0c10b | 2470 | |
717e79c8 | 2471 | /* @@ the meaning of setsockopt() when the socket is connected and |
b6e4a1ae MM |
2472 | * there are multiple subflows is not yet defined. It is up to the |
2473 | * MPTCP-level socket to configure the subflows until the subflow | |
2474 | * is in TCP fallback, when TCP socket options are passed through | |
2475 | * to the one remaining subflow. | |
717e79c8 PK |
2476 | */ |
2477 | lock_sock(sk); | |
76660afb | 2478 | ssk = __mptcp_tcp_fallback(msk); |
e154659b | 2479 | release_sock(sk); |
76660afb PA |
2480 | if (ssk) |
2481 | return tcp_setsockopt(ssk, level, optname, optval, optlen); | |
50e741bb | 2482 | |
c9b95a13 FW |
2483 | if (level == SOL_IPV6) |
2484 | return mptcp_setsockopt_v6(msk, optname, optval, optlen); | |
2485 | ||
b6e4a1ae | 2486 | return -EOPNOTSUPP; |
717e79c8 PK |
2487 | } |
2488 | ||
2489 | static int mptcp_getsockopt(struct sock *sk, int level, int optname, | |
50e741bb | 2490 | char __user *optval, int __user *option) |
717e79c8 PK |
2491 | { |
2492 | struct mptcp_sock *msk = mptcp_sk(sk); | |
76660afb | 2493 | struct sock *ssk; |
717e79c8 PK |
2494 | |
2495 | pr_debug("msk=%p", msk); | |
2496 | ||
b6e4a1ae MM |
2497 | /* @@ the meaning of setsockopt() when the socket is connected and |
2498 | * there are multiple subflows is not yet defined. It is up to the | |
2499 | * MPTCP-level socket to configure the subflows until the subflow | |
2500 | * is in TCP fallback, when socket options are passed through | |
2501 | * to the one remaining subflow. | |
717e79c8 PK |
2502 | */ |
2503 | lock_sock(sk); | |
76660afb | 2504 | ssk = __mptcp_tcp_fallback(msk); |
e154659b | 2505 | release_sock(sk); |
76660afb PA |
2506 | if (ssk) |
2507 | return tcp_getsockopt(ssk, level, optname, optval, option); | |
50e741bb | 2508 | |
b6e4a1ae | 2509 | return -EOPNOTSUPP; |
717e79c8 PK |
2510 | } |
2511 | ||
ea4ca586 | 2512 | #define MPTCP_DEFERRED_ALL (TCPF_WRITE_TIMER_DEFERRED) |
14c441b5 PA |
2513 | |
2514 | /* this is very alike tcp_release_cb() but we must handle differently a | |
2515 | * different set of events | |
2516 | */ | |
2517 | static void mptcp_release_cb(struct sock *sk) | |
2518 | { | |
2519 | unsigned long flags, nflags; | |
2520 | ||
2521 | do { | |
2522 | flags = sk->sk_tsq_flags; | |
2523 | if (!(flags & MPTCP_DEFERRED_ALL)) | |
2524 | return; | |
2525 | nflags = flags & ~MPTCP_DEFERRED_ALL; | |
2526 | } while (cmpxchg(&sk->sk_tsq_flags, flags, nflags) != flags); | |
2527 | ||
b51f9b80 PA |
2528 | sock_release_ownership(sk); |
2529 | ||
b51f9b80 PA |
2530 | if (flags & TCPF_WRITE_TIMER_DEFERRED) { |
2531 | mptcp_retransmit_handler(sk); | |
2532 | __sock_put(sk); | |
2533 | } | |
14c441b5 PA |
2534 | } |
2535 | ||
2c5ebd00 PA |
2536 | static int mptcp_hash(struct sock *sk) |
2537 | { | |
2538 | /* should never be called, | |
2539 | * we hash the TCP subflows not the master socket | |
2540 | */ | |
2541 | WARN_ON_ONCE(1); | |
2542 | return 0; | |
2543 | } | |
2544 | ||
2545 | static void mptcp_unhash(struct sock *sk) | |
2546 | { | |
2547 | /* called from sk_common_release(), but nothing to do here */ | |
2548 | } | |
2549 | ||
cec37a6e | 2550 | static int mptcp_get_port(struct sock *sk, unsigned short snum) |
f870fa0b MM |
2551 | { |
2552 | struct mptcp_sock *msk = mptcp_sk(sk); | |
cec37a6e | 2553 | struct socket *ssock; |
f870fa0b | 2554 | |
cec37a6e PK |
2555 | ssock = __mptcp_nmpc_socket(msk); |
2556 | pr_debug("msk=%p, subflow=%p", msk, ssock); | |
2557 | if (WARN_ON_ONCE(!ssock)) | |
2558 | return -EINVAL; | |
f870fa0b | 2559 | |
cec37a6e PK |
2560 | return inet_csk_get_port(ssock->sk, snum); |
2561 | } | |
f870fa0b | 2562 | |
cec37a6e PK |
2563 | void mptcp_finish_connect(struct sock *ssk) |
2564 | { | |
2565 | struct mptcp_subflow_context *subflow; | |
2566 | struct mptcp_sock *msk; | |
2567 | struct sock *sk; | |
6d0060f6 | 2568 | u64 ack_seq; |
f870fa0b | 2569 | |
cec37a6e | 2570 | subflow = mptcp_subflow_ctx(ssk); |
cec37a6e PK |
2571 | sk = subflow->conn; |
2572 | msk = mptcp_sk(sk); | |
2573 | ||
648ef4b8 MM |
2574 | pr_debug("msk=%p, token=%u", sk, subflow->token); |
2575 | ||
6d0060f6 MM |
2576 | mptcp_crypto_key_sha(subflow->remote_key, NULL, &ack_seq); |
2577 | ack_seq++; | |
648ef4b8 MM |
2578 | subflow->map_seq = ack_seq; |
2579 | subflow->map_subflow_seq = 1; | |
6d0060f6 | 2580 | |
cec37a6e PK |
2581 | /* the socket is not connected yet, no msk/subflow ops can access/race |
2582 | * accessing the field below | |
2583 | */ | |
2584 | WRITE_ONCE(msk->remote_key, subflow->remote_key); | |
2585 | WRITE_ONCE(msk->local_key, subflow->local_key); | |
6d0060f6 | 2586 | WRITE_ONCE(msk->write_seq, subflow->idsn + 1); |
eaa2ffab | 2587 | WRITE_ONCE(msk->snd_nxt, msk->write_seq); |
6d0060f6 | 2588 | WRITE_ONCE(msk->ack_seq, ack_seq); |
fa3fe2b1 | 2589 | WRITE_ONCE(msk->rcv_wnd_sent, ack_seq); |
d22f4988 | 2590 | WRITE_ONCE(msk->can_ack, 1); |
cc9d2566 | 2591 | atomic64_set(&msk->snd_una, msk->write_seq); |
1b1c7a0e PK |
2592 | |
2593 | mptcp_pm_new_connection(msk, 0); | |
a6b118fe FW |
2594 | |
2595 | mptcp_rcv_space_init(msk, ssk); | |
f870fa0b MM |
2596 | } |
2597 | ||
cf7da0d6 PK |
2598 | static void mptcp_sock_graft(struct sock *sk, struct socket *parent) |
2599 | { | |
2600 | write_lock_bh(&sk->sk_callback_lock); | |
2601 | rcu_assign_pointer(sk->sk_wq, &parent->wq); | |
2602 | sk_set_socket(sk, parent); | |
2603 | sk->sk_uid = SOCK_INODE(parent)->i_uid; | |
2604 | write_unlock_bh(&sk->sk_callback_lock); | |
2605 | } | |
2606 | ||
e16163b6 | 2607 | bool mptcp_finish_join(struct sock *ssk) |
f296234c | 2608 | { |
e16163b6 | 2609 | struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); |
f296234c PK |
2610 | struct mptcp_sock *msk = mptcp_sk(subflow->conn); |
2611 | struct sock *parent = (void *)msk; | |
2612 | struct socket *parent_sock; | |
ec3edaa7 | 2613 | bool ret; |
f296234c PK |
2614 | |
2615 | pr_debug("msk=%p, subflow=%p", msk, subflow); | |
2616 | ||
2617 | /* mptcp socket already closing? */ | |
b93df08c | 2618 | if (!mptcp_is_fully_established(parent)) |
f296234c PK |
2619 | return false; |
2620 | ||
2621 | if (!msk->pm.server_side) | |
2622 | return true; | |
2623 | ||
10f6d46c PA |
2624 | if (!mptcp_pm_allow_new_subflow(msk)) |
2625 | return false; | |
2626 | ||
2627 | /* active connections are already on conn_list, and we can't acquire | |
2628 | * msk lock here. | |
2629 | * use the join list lock as synchronization point and double-check | |
e16163b6 | 2630 | * msk status to avoid racing with __mptcp_destroy_sock() |
10f6d46c PA |
2631 | */ |
2632 | spin_lock_bh(&msk->join_list_lock); | |
2633 | ret = inet_sk_state_load(parent) == TCP_ESTABLISHED; | |
e16163b6 | 2634 | if (ret && !WARN_ON_ONCE(!list_empty(&subflow->node))) { |
10f6d46c | 2635 | list_add_tail(&subflow->node, &msk->join_list); |
e16163b6 PA |
2636 | sock_hold(ssk); |
2637 | } | |
10f6d46c PA |
2638 | spin_unlock_bh(&msk->join_list_lock); |
2639 | if (!ret) | |
2640 | return false; | |
2641 | ||
2642 | /* attach to msk socket only after we are sure he will deal with us | |
2643 | * at close time | |
2644 | */ | |
f296234c | 2645 | parent_sock = READ_ONCE(parent->sk_socket); |
e16163b6 PA |
2646 | if (parent_sock && !ssk->sk_socket) |
2647 | mptcp_sock_graft(ssk, parent_sock); | |
917944da | 2648 | subflow->map_seq = READ_ONCE(msk->ack_seq); |
10f6d46c | 2649 | return true; |
f296234c PK |
2650 | } |
2651 | ||
f870fa0b MM |
2652 | static struct proto mptcp_prot = { |
2653 | .name = "MPTCP", | |
2654 | .owner = THIS_MODULE, | |
2655 | .init = mptcp_init_sock, | |
18b683bf | 2656 | .disconnect = mptcp_disconnect, |
f870fa0b | 2657 | .close = mptcp_close, |
cf7da0d6 | 2658 | .accept = mptcp_accept, |
717e79c8 PK |
2659 | .setsockopt = mptcp_setsockopt, |
2660 | .getsockopt = mptcp_getsockopt, | |
f870fa0b | 2661 | .shutdown = tcp_shutdown, |
79c0949e | 2662 | .destroy = mptcp_destroy, |
f870fa0b MM |
2663 | .sendmsg = mptcp_sendmsg, |
2664 | .recvmsg = mptcp_recvmsg, | |
14c441b5 | 2665 | .release_cb = mptcp_release_cb, |
2c5ebd00 PA |
2666 | .hash = mptcp_hash, |
2667 | .unhash = mptcp_unhash, | |
cec37a6e | 2668 | .get_port = mptcp_get_port, |
d027236c PA |
2669 | .sockets_allocated = &mptcp_sockets_allocated, |
2670 | .memory_allocated = &tcp_memory_allocated, | |
2671 | .memory_pressure = &tcp_memory_pressure, | |
d027236c | 2672 | .sysctl_wmem_offset = offsetof(struct net, ipv4.sysctl_tcp_wmem), |
989ef49b | 2673 | .sysctl_rmem_offset = offsetof(struct net, ipv4.sysctl_tcp_rmem), |
d027236c | 2674 | .sysctl_mem = sysctl_tcp_mem, |
f870fa0b | 2675 | .obj_size = sizeof(struct mptcp_sock), |
2c5ebd00 | 2676 | .slab_flags = SLAB_TYPESAFE_BY_RCU, |
f870fa0b MM |
2677 | .no_autobind = true, |
2678 | }; | |
2679 | ||
2303f994 PK |
2680 | static int mptcp_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) |
2681 | { | |
2682 | struct mptcp_sock *msk = mptcp_sk(sock->sk); | |
2683 | struct socket *ssock; | |
cf7da0d6 | 2684 | int err; |
2303f994 PK |
2685 | |
2686 | lock_sock(sock->sk); | |
fa68018d PA |
2687 | ssock = __mptcp_nmpc_socket(msk); |
2688 | if (!ssock) { | |
2689 | err = -EINVAL; | |
2303f994 PK |
2690 | goto unlock; |
2691 | } | |
2692 | ||
2693 | err = ssock->ops->bind(ssock, uaddr, addr_len); | |
cf7da0d6 PK |
2694 | if (!err) |
2695 | mptcp_copy_inaddrs(sock->sk, ssock->sk); | |
2303f994 PK |
2696 | |
2697 | unlock: | |
2698 | release_sock(sock->sk); | |
2699 | return err; | |
2700 | } | |
2701 | ||
0235d075 PA |
2702 | static void mptcp_subflow_early_fallback(struct mptcp_sock *msk, |
2703 | struct mptcp_subflow_context *subflow) | |
2704 | { | |
2705 | subflow->request_mptcp = 0; | |
2706 | __mptcp_do_fallback(msk); | |
2707 | } | |
2708 | ||
2303f994 PK |
2709 | static int mptcp_stream_connect(struct socket *sock, struct sockaddr *uaddr, |
2710 | int addr_len, int flags) | |
2711 | { | |
2712 | struct mptcp_sock *msk = mptcp_sk(sock->sk); | |
2c5ebd00 | 2713 | struct mptcp_subflow_context *subflow; |
2303f994 PK |
2714 | struct socket *ssock; |
2715 | int err; | |
2716 | ||
2717 | lock_sock(sock->sk); | |
41be81a8 PA |
2718 | if (sock->state != SS_UNCONNECTED && msk->subflow) { |
2719 | /* pending connection or invalid state, let existing subflow | |
2720 | * cope with that | |
2721 | */ | |
2722 | ssock = msk->subflow; | |
2723 | goto do_connect; | |
2724 | } | |
2725 | ||
fa68018d PA |
2726 | ssock = __mptcp_nmpc_socket(msk); |
2727 | if (!ssock) { | |
2728 | err = -EINVAL; | |
2303f994 PK |
2729 | goto unlock; |
2730 | } | |
2731 | ||
fa68018d PA |
2732 | mptcp_token_destroy(msk); |
2733 | inet_sk_state_store(sock->sk, TCP_SYN_SENT); | |
2c5ebd00 | 2734 | subflow = mptcp_subflow_ctx(ssock->sk); |
cf7da0d6 PK |
2735 | #ifdef CONFIG_TCP_MD5SIG |
2736 | /* no MPTCP if MD5SIG is enabled on this socket or we may run out of | |
2737 | * TCP option space. | |
2738 | */ | |
2739 | if (rcu_access_pointer(tcp_sk(ssock->sk)->md5sig_info)) | |
0235d075 | 2740 | mptcp_subflow_early_fallback(msk, subflow); |
cf7da0d6 | 2741 | #endif |
2c5ebd00 | 2742 | if (subflow->request_mptcp && mptcp_token_new_connect(ssock->sk)) |
0235d075 | 2743 | mptcp_subflow_early_fallback(msk, subflow); |
cf7da0d6 | 2744 | |
41be81a8 | 2745 | do_connect: |
2303f994 | 2746 | err = ssock->ops->connect(ssock, uaddr, addr_len, flags); |
41be81a8 PA |
2747 | sock->state = ssock->state; |
2748 | ||
2749 | /* on successful connect, the msk state will be moved to established by | |
2750 | * subflow_finish_connect() | |
2751 | */ | |
367fe04e | 2752 | if (!err || err == -EINPROGRESS) |
41be81a8 PA |
2753 | mptcp_copy_inaddrs(sock->sk, ssock->sk); |
2754 | else | |
2755 | inet_sk_state_store(sock->sk, inet_sk_state_load(ssock->sk)); | |
2303f994 PK |
2756 | |
2757 | unlock: | |
2758 | release_sock(sock->sk); | |
2759 | return err; | |
2760 | } | |
2761 | ||
cf7da0d6 PK |
2762 | static int mptcp_listen(struct socket *sock, int backlog) |
2763 | { | |
2764 | struct mptcp_sock *msk = mptcp_sk(sock->sk); | |
2765 | struct socket *ssock; | |
2766 | int err; | |
2767 | ||
2768 | pr_debug("msk=%p", msk); | |
2769 | ||
2770 | lock_sock(sock->sk); | |
fa68018d PA |
2771 | ssock = __mptcp_nmpc_socket(msk); |
2772 | if (!ssock) { | |
2773 | err = -EINVAL; | |
cf7da0d6 PK |
2774 | goto unlock; |
2775 | } | |
2776 | ||
fa68018d PA |
2777 | mptcp_token_destroy(msk); |
2778 | inet_sk_state_store(sock->sk, TCP_LISTEN); | |
5e20087d FW |
2779 | sock_set_flag(sock->sk, SOCK_RCU_FREE); |
2780 | ||
cf7da0d6 PK |
2781 | err = ssock->ops->listen(ssock, backlog); |
2782 | inet_sk_state_store(sock->sk, inet_sk_state_load(ssock->sk)); | |
2783 | if (!err) | |
2784 | mptcp_copy_inaddrs(sock->sk, ssock->sk); | |
2785 | ||
2786 | unlock: | |
2787 | release_sock(sock->sk); | |
2788 | return err; | |
2789 | } | |
2790 | ||
cf7da0d6 PK |
2791 | static int mptcp_stream_accept(struct socket *sock, struct socket *newsock, |
2792 | int flags, bool kern) | |
2793 | { | |
2794 | struct mptcp_sock *msk = mptcp_sk(sock->sk); | |
2795 | struct socket *ssock; | |
2796 | int err; | |
2797 | ||
2798 | pr_debug("msk=%p", msk); | |
2799 | ||
2800 | lock_sock(sock->sk); | |
2801 | if (sock->sk->sk_state != TCP_LISTEN) | |
2802 | goto unlock_fail; | |
2803 | ||
2804 | ssock = __mptcp_nmpc_socket(msk); | |
2805 | if (!ssock) | |
2806 | goto unlock_fail; | |
2807 | ||
8a05661b | 2808 | clear_bit(MPTCP_DATA_READY, &msk->flags); |
cf7da0d6 PK |
2809 | sock_hold(ssock->sk); |
2810 | release_sock(sock->sk); | |
2811 | ||
2812 | err = ssock->ops->accept(sock, newsock, flags, kern); | |
d2f77c53 | 2813 | if (err == 0 && !mptcp_is_tcpsk(newsock->sk)) { |
cf7da0d6 PK |
2814 | struct mptcp_sock *msk = mptcp_sk(newsock->sk); |
2815 | struct mptcp_subflow_context *subflow; | |
0397c6d8 PA |
2816 | struct sock *newsk = newsock->sk; |
2817 | bool slowpath; | |
2818 | ||
2819 | slowpath = lock_sock_fast(newsk); | |
2820 | mptcp_copy_inaddrs(newsk, msk->first); | |
2821 | mptcp_rcv_space_init(msk, msk->first); | |
cf7da0d6 PK |
2822 | |
2823 | /* set ssk->sk_socket of accept()ed flows to mptcp socket. | |
2824 | * This is needed so NOSPACE flag can be set from tcp stack. | |
2825 | */ | |
ec3edaa7 | 2826 | __mptcp_flush_join_list(msk); |
190f8b06 | 2827 | mptcp_for_each_subflow(msk, subflow) { |
cf7da0d6 PK |
2828 | struct sock *ssk = mptcp_subflow_tcp_sock(subflow); |
2829 | ||
2830 | if (!ssk->sk_socket) | |
2831 | mptcp_sock_graft(ssk, newsock); | |
2832 | } | |
0397c6d8 | 2833 | unlock_sock_fast(newsk, slowpath); |
cf7da0d6 PK |
2834 | } |
2835 | ||
8a05661b PA |
2836 | if (inet_csk_listen_poll(ssock->sk)) |
2837 | set_bit(MPTCP_DATA_READY, &msk->flags); | |
cf7da0d6 PK |
2838 | sock_put(ssock->sk); |
2839 | return err; | |
2840 | ||
2841 | unlock_fail: | |
2842 | release_sock(sock->sk); | |
2843 | return -EINVAL; | |
2844 | } | |
2845 | ||
8a05661b PA |
2846 | static __poll_t mptcp_check_readable(struct mptcp_sock *msk) |
2847 | { | |
2848 | return test_bit(MPTCP_DATA_READY, &msk->flags) ? EPOLLIN | EPOLLRDNORM : | |
2849 | 0; | |
2850 | } | |
2851 | ||
8edf0864 FW |
2852 | static bool __mptcp_check_writeable(struct mptcp_sock *msk) |
2853 | { | |
2854 | struct sock *sk = (struct sock *)msk; | |
2855 | bool mptcp_writable; | |
2856 | ||
2857 | mptcp_clean_una(sk); | |
2858 | mptcp_writable = sk_stream_is_writeable(sk); | |
2859 | if (!mptcp_writable) | |
2860 | mptcp_nospace(msk); | |
2861 | ||
2862 | return mptcp_writable; | |
2863 | } | |
2864 | ||
2865 | static __poll_t mptcp_check_writeable(struct mptcp_sock *msk) | |
2866 | { | |
2867 | struct sock *sk = (struct sock *)msk; | |
2868 | __poll_t ret = 0; | |
2869 | bool slow; | |
2870 | ||
2871 | if (unlikely(sk->sk_shutdown & SEND_SHUTDOWN)) | |
2872 | return 0; | |
2873 | ||
2874 | if (sk_stream_is_writeable(sk)) | |
2875 | return EPOLLOUT | EPOLLWRNORM; | |
2876 | ||
2877 | slow = lock_sock_fast(sk); | |
2878 | if (__mptcp_check_writeable(msk)) | |
2879 | ret = EPOLLOUT | EPOLLWRNORM; | |
2880 | ||
2881 | unlock_sock_fast(sk, slow); | |
2882 | return ret; | |
2883 | } | |
2884 | ||
2303f994 PK |
2885 | static __poll_t mptcp_poll(struct file *file, struct socket *sock, |
2886 | struct poll_table_struct *wait) | |
2887 | { | |
1891c4a0 | 2888 | struct sock *sk = sock->sk; |
8ab183de | 2889 | struct mptcp_sock *msk; |
2303f994 | 2890 | __poll_t mask = 0; |
8a05661b | 2891 | int state; |
2303f994 | 2892 | |
1891c4a0 | 2893 | msk = mptcp_sk(sk); |
1891c4a0 | 2894 | sock_poll_wait(file, sock, wait); |
1891c4a0 | 2895 | |
8a05661b | 2896 | state = inet_sk_state_load(sk); |
6719331c | 2897 | pr_debug("msk=%p state=%d flags=%lx", msk, state, msk->flags); |
8a05661b PA |
2898 | if (state == TCP_LISTEN) |
2899 | return mptcp_check_readable(msk); | |
2900 | ||
2901 | if (state != TCP_SYN_SENT && state != TCP_SYN_RECV) { | |
2902 | mask |= mptcp_check_readable(msk); | |
8edf0864 | 2903 | mask |= mptcp_check_writeable(msk); |
8a05661b | 2904 | } |
1891c4a0 FW |
2905 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
2906 | mask |= EPOLLIN | EPOLLRDNORM | EPOLLRDHUP; | |
2907 | ||
2303f994 PK |
2908 | return mask; |
2909 | } | |
2910 | ||
21498490 PK |
2911 | static int mptcp_shutdown(struct socket *sock, int how) |
2912 | { | |
2913 | struct mptcp_sock *msk = mptcp_sk(sock->sk); | |
e16163b6 | 2914 | struct sock *sk = sock->sk; |
21498490 PK |
2915 | int ret = 0; |
2916 | ||
2917 | pr_debug("sk=%p, how=%d", msk, how); | |
2918 | ||
e16163b6 | 2919 | lock_sock(sk); |
21498490 PK |
2920 | |
2921 | how++; | |
21498490 PK |
2922 | if ((how & ~SHUTDOWN_MASK) || !how) { |
2923 | ret = -EINVAL; | |
2924 | goto out_unlock; | |
2925 | } | |
2926 | ||
2927 | if (sock->state == SS_CONNECTING) { | |
e16163b6 | 2928 | if ((1 << sk->sk_state) & |
21498490 PK |
2929 | (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE)) |
2930 | sock->state = SS_DISCONNECTING; | |
2931 | else | |
2932 | sock->state = SS_CONNECTED; | |
2933 | } | |
2934 | ||
e16163b6 PA |
2935 | sk->sk_shutdown |= how; |
2936 | if ((how & SEND_SHUTDOWN) && mptcp_close_state(sk)) | |
2937 | __mptcp_wr_shutdown(sk); | |
21498490 | 2938 | |
e1ff9e82 | 2939 | /* Wake up anyone sleeping in poll. */ |
e16163b6 | 2940 | sk->sk_state_change(sk); |
e1ff9e82 | 2941 | |
21498490 | 2942 | out_unlock: |
e16163b6 | 2943 | release_sock(sk); |
21498490 PK |
2944 | |
2945 | return ret; | |
2946 | } | |
2947 | ||
e42f1ac6 FW |
2948 | static const struct proto_ops mptcp_stream_ops = { |
2949 | .family = PF_INET, | |
2950 | .owner = THIS_MODULE, | |
2951 | .release = inet_release, | |
2952 | .bind = mptcp_bind, | |
2953 | .connect = mptcp_stream_connect, | |
2954 | .socketpair = sock_no_socketpair, | |
2955 | .accept = mptcp_stream_accept, | |
d2f77c53 | 2956 | .getname = inet_getname, |
e42f1ac6 FW |
2957 | .poll = mptcp_poll, |
2958 | .ioctl = inet_ioctl, | |
2959 | .gettstamp = sock_gettstamp, | |
2960 | .listen = mptcp_listen, | |
2961 | .shutdown = mptcp_shutdown, | |
2962 | .setsockopt = sock_common_setsockopt, | |
2963 | .getsockopt = sock_common_getsockopt, | |
2964 | .sendmsg = inet_sendmsg, | |
2965 | .recvmsg = inet_recvmsg, | |
2966 | .mmap = sock_no_mmap, | |
2967 | .sendpage = inet_sendpage, | |
e42f1ac6 | 2968 | }; |
2303f994 | 2969 | |
f870fa0b MM |
2970 | static struct inet_protosw mptcp_protosw = { |
2971 | .type = SOCK_STREAM, | |
2972 | .protocol = IPPROTO_MPTCP, | |
2973 | .prot = &mptcp_prot, | |
2303f994 PK |
2974 | .ops = &mptcp_stream_ops, |
2975 | .flags = INET_PROTOSW_ICSK, | |
f870fa0b MM |
2976 | }; |
2977 | ||
d39dceca | 2978 | void __init mptcp_proto_init(void) |
f870fa0b | 2979 | { |
2303f994 | 2980 | mptcp_prot.h.hashinfo = tcp_prot.h.hashinfo; |
2303f994 | 2981 | |
d027236c PA |
2982 | if (percpu_counter_init(&mptcp_sockets_allocated, 0, GFP_KERNEL)) |
2983 | panic("Failed to allocate MPTCP pcpu counter\n"); | |
2984 | ||
2303f994 | 2985 | mptcp_subflow_init(); |
1b1c7a0e | 2986 | mptcp_pm_init(); |
2c5ebd00 | 2987 | mptcp_token_init(); |
2303f994 | 2988 | |
f870fa0b MM |
2989 | if (proto_register(&mptcp_prot, 1) != 0) |
2990 | panic("Failed to register MPTCP proto.\n"); | |
2991 | ||
2992 | inet_register_protosw(&mptcp_protosw); | |
6771bfd9 FW |
2993 | |
2994 | BUILD_BUG_ON(sizeof(struct mptcp_skb_cb) > sizeof_field(struct sk_buff, cb)); | |
f870fa0b MM |
2995 | } |
2996 | ||
2997 | #if IS_ENABLED(CONFIG_MPTCP_IPV6) | |
e42f1ac6 FW |
2998 | static const struct proto_ops mptcp_v6_stream_ops = { |
2999 | .family = PF_INET6, | |
3000 | .owner = THIS_MODULE, | |
3001 | .release = inet6_release, | |
3002 | .bind = mptcp_bind, | |
3003 | .connect = mptcp_stream_connect, | |
3004 | .socketpair = sock_no_socketpair, | |
3005 | .accept = mptcp_stream_accept, | |
d2f77c53 | 3006 | .getname = inet6_getname, |
e42f1ac6 FW |
3007 | .poll = mptcp_poll, |
3008 | .ioctl = inet6_ioctl, | |
3009 | .gettstamp = sock_gettstamp, | |
3010 | .listen = mptcp_listen, | |
3011 | .shutdown = mptcp_shutdown, | |
3012 | .setsockopt = sock_common_setsockopt, | |
3013 | .getsockopt = sock_common_getsockopt, | |
3014 | .sendmsg = inet6_sendmsg, | |
3015 | .recvmsg = inet6_recvmsg, | |
3016 | .mmap = sock_no_mmap, | |
3017 | .sendpage = inet_sendpage, | |
3018 | #ifdef CONFIG_COMPAT | |
3986912f | 3019 | .compat_ioctl = inet6_compat_ioctl, |
e42f1ac6 FW |
3020 | #endif |
3021 | }; | |
3022 | ||
f870fa0b MM |
3023 | static struct proto mptcp_v6_prot; |
3024 | ||
79c0949e PK |
3025 | static void mptcp_v6_destroy(struct sock *sk) |
3026 | { | |
3027 | mptcp_destroy(sk); | |
3028 | inet6_destroy_sock(sk); | |
3029 | } | |
3030 | ||
f870fa0b MM |
3031 | static struct inet_protosw mptcp_v6_protosw = { |
3032 | .type = SOCK_STREAM, | |
3033 | .protocol = IPPROTO_MPTCP, | |
3034 | .prot = &mptcp_v6_prot, | |
2303f994 | 3035 | .ops = &mptcp_v6_stream_ops, |
f870fa0b MM |
3036 | .flags = INET_PROTOSW_ICSK, |
3037 | }; | |
3038 | ||
d39dceca | 3039 | int __init mptcp_proto_v6_init(void) |
f870fa0b MM |
3040 | { |
3041 | int err; | |
3042 | ||
3043 | mptcp_v6_prot = mptcp_prot; | |
3044 | strcpy(mptcp_v6_prot.name, "MPTCPv6"); | |
3045 | mptcp_v6_prot.slab = NULL; | |
79c0949e | 3046 | mptcp_v6_prot.destroy = mptcp_v6_destroy; |
b0519de8 | 3047 | mptcp_v6_prot.obj_size = sizeof(struct mptcp6_sock); |
f870fa0b MM |
3048 | |
3049 | err = proto_register(&mptcp_v6_prot, 1); | |
3050 | if (err) | |
3051 | return err; | |
3052 | ||
3053 | err = inet6_register_protosw(&mptcp_v6_protosw); | |
3054 | if (err) | |
3055 | proto_unregister(&mptcp_v6_prot); | |
3056 | ||
3057 | return err; | |
3058 | } | |
3059 | #endif |