Commit | Line | Data |
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f870fa0b MM |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* Multipath TCP | |
3 | * | |
4 | * Copyright (c) 2017 - 2019, Intel Corporation. | |
5 | */ | |
6 | ||
7 | #define pr_fmt(fmt) "MPTCP: " fmt | |
8 | ||
9 | #include <linux/kernel.h> | |
10 | #include <linux/module.h> | |
11 | #include <linux/netdevice.h> | |
7a6a6cbc PA |
12 | #include <linux/sched/signal.h> |
13 | #include <linux/atomic.h> | |
ad98dd37 | 14 | #include <linux/igmp.h> |
f870fa0b MM |
15 | #include <net/sock.h> |
16 | #include <net/inet_common.h> | |
17 | #include <net/inet_hashtables.h> | |
18 | #include <net/protocol.h> | |
19 | #include <net/tcp.h> | |
3721b9b6 | 20 | #include <net/tcp_states.h> |
cf7da0d6 PK |
21 | #if IS_ENABLED(CONFIG_MPTCP_IPV6) |
22 | #include <net/transp_v6.h> | |
ad98dd37 | 23 | #include <net/addrconf.h> |
cf7da0d6 | 24 | #endif |
f870fa0b | 25 | #include <net/mptcp.h> |
e16163b6 | 26 | #include <net/xfrm.h> |
f870fa0b | 27 | #include "protocol.h" |
fc518953 | 28 | #include "mib.h" |
f870fa0b | 29 | |
b0519de8 FW |
30 | #if IS_ENABLED(CONFIG_MPTCP_IPV6) |
31 | struct mptcp6_sock { | |
32 | struct mptcp_sock msk; | |
33 | struct ipv6_pinfo np; | |
34 | }; | |
35 | #endif | |
36 | ||
6771bfd9 | 37 | struct mptcp_skb_cb { |
ab174ad8 PA |
38 | u64 map_seq; |
39 | u64 end_seq; | |
6771bfd9 FW |
40 | u32 offset; |
41 | }; | |
42 | ||
43 | #define MPTCP_SKB_CB(__skb) ((struct mptcp_skb_cb *)&((__skb)->cb[0])) | |
44 | ||
d027236c PA |
45 | static struct percpu_counter mptcp_sockets_allocated; |
46 | ||
e16163b6 | 47 | static void __mptcp_destroy_sock(struct sock *sk); |
d9ca1de8 | 48 | static void __mptcp_check_send_data_fin(struct sock *sk); |
e16163b6 | 49 | |
b19bc294 PA |
50 | DEFINE_PER_CPU(struct mptcp_delegated_action, mptcp_delegated_actions); |
51 | static struct net_device mptcp_napi_dev; | |
52 | ||
2303f994 PK |
53 | /* If msk has an initial subflow socket, and the MP_CAPABLE handshake has not |
54 | * completed yet or has failed, return the subflow socket. | |
55 | * Otherwise return NULL. | |
56 | */ | |
1729cf18 | 57 | struct socket *__mptcp_nmpc_socket(const struct mptcp_sock *msk) |
2303f994 | 58 | { |
d22f4988 | 59 | if (!msk->subflow || READ_ONCE(msk->can_ack)) |
2303f994 PK |
60 | return NULL; |
61 | ||
62 | return msk->subflow; | |
63 | } | |
64 | ||
6f8a612a FW |
65 | /* Returns end sequence number of the receiver's advertised window */ |
66 | static u64 mptcp_wnd_end(const struct mptcp_sock *msk) | |
67 | { | |
7439d687 | 68 | return READ_ONCE(msk->wnd_end); |
6f8a612a FW |
69 | } |
70 | ||
d2f77c53 | 71 | static bool mptcp_is_tcpsk(struct sock *sk) |
0b4f33de FW |
72 | { |
73 | struct socket *sock = sk->sk_socket; | |
74 | ||
0b4f33de FW |
75 | if (unlikely(sk->sk_prot == &tcp_prot)) { |
76 | /* we are being invoked after mptcp_accept() has | |
77 | * accepted a non-mp-capable flow: sk is a tcp_sk, | |
78 | * not an mptcp one. | |
79 | * | |
80 | * Hand the socket over to tcp so all further socket ops | |
81 | * bypass mptcp. | |
82 | */ | |
83 | sock->ops = &inet_stream_ops; | |
d2f77c53 | 84 | return true; |
0b4f33de FW |
85 | #if IS_ENABLED(CONFIG_MPTCP_IPV6) |
86 | } else if (unlikely(sk->sk_prot == &tcpv6_prot)) { | |
87 | sock->ops = &inet6_stream_ops; | |
d2f77c53 | 88 | return true; |
0b4f33de FW |
89 | #endif |
90 | } | |
91 | ||
d2f77c53 | 92 | return false; |
0b4f33de FW |
93 | } |
94 | ||
76660afb | 95 | static struct sock *__mptcp_tcp_fallback(struct mptcp_sock *msk) |
cec37a6e | 96 | { |
cec37a6e PK |
97 | sock_owned_by_me((const struct sock *)msk); |
98 | ||
e1ff9e82 | 99 | if (likely(!__mptcp_check_fallback(msk))) |
cec37a6e PK |
100 | return NULL; |
101 | ||
76660afb | 102 | return msk->first; |
cec37a6e PK |
103 | } |
104 | ||
fa68018d | 105 | static int __mptcp_socket_create(struct mptcp_sock *msk) |
2303f994 PK |
106 | { |
107 | struct mptcp_subflow_context *subflow; | |
108 | struct sock *sk = (struct sock *)msk; | |
109 | struct socket *ssock; | |
110 | int err; | |
111 | ||
2303f994 PK |
112 | err = mptcp_subflow_create_socket(sk, &ssock); |
113 | if (err) | |
fa68018d | 114 | return err; |
2303f994 | 115 | |
8ab183de | 116 | msk->first = ssock->sk; |
2303f994 PK |
117 | msk->subflow = ssock; |
118 | subflow = mptcp_subflow_ctx(ssock->sk); | |
cec37a6e | 119 | list_add(&subflow->node, &msk->conn_list); |
e16163b6 | 120 | sock_hold(ssock->sk); |
2303f994 | 121 | subflow->request_mptcp = 1; |
866f26f2 | 122 | mptcp_sock_graft(msk->first, sk->sk_socket); |
e1ff9e82 | 123 | |
fa68018d | 124 | return 0; |
2303f994 PK |
125 | } |
126 | ||
ab174ad8 PA |
127 | static void mptcp_drop(struct sock *sk, struct sk_buff *skb) |
128 | { | |
129 | sk_drops_add(sk, skb); | |
130 | __kfree_skb(skb); | |
131 | } | |
132 | ||
8268ed4c PA |
133 | static bool mptcp_try_coalesce(struct sock *sk, struct sk_buff *to, |
134 | struct sk_buff *from) | |
135 | { | |
136 | bool fragstolen; | |
137 | int delta; | |
138 | ||
139 | if (MPTCP_SKB_CB(from)->offset || | |
140 | !skb_try_coalesce(to, from, &fragstolen, &delta)) | |
141 | return false; | |
142 | ||
06242e44 PA |
143 | pr_debug("colesced seq %llx into %llx new len %d new end seq %llx", |
144 | MPTCP_SKB_CB(from)->map_seq, MPTCP_SKB_CB(to)->map_seq, | |
145 | to->len, MPTCP_SKB_CB(from)->end_seq); | |
ab174ad8 | 146 | MPTCP_SKB_CB(to)->end_seq = MPTCP_SKB_CB(from)->end_seq; |
8268ed4c PA |
147 | kfree_skb_partial(from, fragstolen); |
148 | atomic_add(delta, &sk->sk_rmem_alloc); | |
149 | sk_mem_charge(sk, delta); | |
150 | return true; | |
151 | } | |
152 | ||
ab174ad8 PA |
153 | static bool mptcp_ooo_try_coalesce(struct mptcp_sock *msk, struct sk_buff *to, |
154 | struct sk_buff *from) | |
155 | { | |
156 | if (MPTCP_SKB_CB(from)->map_seq != MPTCP_SKB_CB(to)->end_seq) | |
157 | return false; | |
158 | ||
159 | return mptcp_try_coalesce((struct sock *)msk, to, from); | |
160 | } | |
161 | ||
162 | /* "inspired" by tcp_data_queue_ofo(), main differences: | |
163 | * - use mptcp seqs | |
164 | * - don't cope with sacks | |
165 | */ | |
166 | static void mptcp_data_queue_ofo(struct mptcp_sock *msk, struct sk_buff *skb) | |
167 | { | |
168 | struct sock *sk = (struct sock *)msk; | |
169 | struct rb_node **p, *parent; | |
170 | u64 seq, end_seq, max_seq; | |
171 | struct sk_buff *skb1; | |
172 | ||
173 | seq = MPTCP_SKB_CB(skb)->map_seq; | |
174 | end_seq = MPTCP_SKB_CB(skb)->end_seq; | |
fa3fe2b1 | 175 | max_seq = READ_ONCE(msk->rcv_wnd_sent); |
ab174ad8 | 176 | |
06242e44 PA |
177 | pr_debug("msk=%p seq=%llx limit=%llx empty=%d", msk, seq, max_seq, |
178 | RB_EMPTY_ROOT(&msk->out_of_order_queue)); | |
fa3fe2b1 | 179 | if (after64(end_seq, max_seq)) { |
ab174ad8 PA |
180 | /* out of window */ |
181 | mptcp_drop(sk, skb); | |
fa3fe2b1 FW |
182 | pr_debug("oow by %lld, rcv_wnd_sent %llu\n", |
183 | (unsigned long long)end_seq - (unsigned long)max_seq, | |
184 | (unsigned long long)msk->rcv_wnd_sent); | |
06242e44 | 185 | MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_NODSSWINDOW); |
ab174ad8 PA |
186 | return; |
187 | } | |
188 | ||
189 | p = &msk->out_of_order_queue.rb_node; | |
06242e44 | 190 | MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_OFOQUEUE); |
ab174ad8 PA |
191 | if (RB_EMPTY_ROOT(&msk->out_of_order_queue)) { |
192 | rb_link_node(&skb->rbnode, NULL, p); | |
193 | rb_insert_color(&skb->rbnode, &msk->out_of_order_queue); | |
194 | msk->ooo_last_skb = skb; | |
195 | goto end; | |
196 | } | |
197 | ||
198 | /* with 2 subflows, adding at end of ooo queue is quite likely | |
199 | * Use of ooo_last_skb avoids the O(Log(N)) rbtree lookup. | |
200 | */ | |
06242e44 PA |
201 | if (mptcp_ooo_try_coalesce(msk, msk->ooo_last_skb, skb)) { |
202 | MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_OFOMERGE); | |
203 | MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_OFOQUEUETAIL); | |
ab174ad8 | 204 | return; |
06242e44 | 205 | } |
ab174ad8 PA |
206 | |
207 | /* Can avoid an rbtree lookup if we are adding skb after ooo_last_skb */ | |
208 | if (!before64(seq, MPTCP_SKB_CB(msk->ooo_last_skb)->end_seq)) { | |
06242e44 | 209 | MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_OFOQUEUETAIL); |
ab174ad8 PA |
210 | parent = &msk->ooo_last_skb->rbnode; |
211 | p = &parent->rb_right; | |
212 | goto insert; | |
213 | } | |
214 | ||
215 | /* Find place to insert this segment. Handle overlaps on the way. */ | |
216 | parent = NULL; | |
217 | while (*p) { | |
218 | parent = *p; | |
219 | skb1 = rb_to_skb(parent); | |
220 | if (before64(seq, MPTCP_SKB_CB(skb1)->map_seq)) { | |
221 | p = &parent->rb_left; | |
222 | continue; | |
223 | } | |
224 | if (before64(seq, MPTCP_SKB_CB(skb1)->end_seq)) { | |
225 | if (!after64(end_seq, MPTCP_SKB_CB(skb1)->end_seq)) { | |
226 | /* All the bits are present. Drop. */ | |
227 | mptcp_drop(sk, skb); | |
06242e44 | 228 | MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_DUPDATA); |
ab174ad8 PA |
229 | return; |
230 | } | |
231 | if (after64(seq, MPTCP_SKB_CB(skb1)->map_seq)) { | |
232 | /* partial overlap: | |
233 | * | skb | | |
234 | * | skb1 | | |
235 | * continue traversing | |
236 | */ | |
237 | } else { | |
238 | /* skb's seq == skb1's seq and skb covers skb1. | |
239 | * Replace skb1 with skb. | |
240 | */ | |
241 | rb_replace_node(&skb1->rbnode, &skb->rbnode, | |
242 | &msk->out_of_order_queue); | |
243 | mptcp_drop(sk, skb1); | |
06242e44 | 244 | MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_DUPDATA); |
ab174ad8 PA |
245 | goto merge_right; |
246 | } | |
247 | } else if (mptcp_ooo_try_coalesce(msk, skb1, skb)) { | |
06242e44 | 248 | MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_OFOMERGE); |
ab174ad8 PA |
249 | return; |
250 | } | |
251 | p = &parent->rb_right; | |
252 | } | |
06242e44 | 253 | |
ab174ad8 PA |
254 | insert: |
255 | /* Insert segment into RB tree. */ | |
256 | rb_link_node(&skb->rbnode, parent, p); | |
257 | rb_insert_color(&skb->rbnode, &msk->out_of_order_queue); | |
258 | ||
259 | merge_right: | |
260 | /* Remove other segments covered by skb. */ | |
261 | while ((skb1 = skb_rb_next(skb)) != NULL) { | |
262 | if (before64(end_seq, MPTCP_SKB_CB(skb1)->end_seq)) | |
263 | break; | |
264 | rb_erase(&skb1->rbnode, &msk->out_of_order_queue); | |
265 | mptcp_drop(sk, skb1); | |
06242e44 | 266 | MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_DUPDATA); |
ab174ad8 PA |
267 | } |
268 | /* If there is no skb after us, we are the last_skb ! */ | |
269 | if (!skb1) | |
270 | msk->ooo_last_skb = skb; | |
271 | ||
272 | end: | |
273 | skb_condense(skb); | |
274 | skb_set_owner_r(skb, sk); | |
275 | } | |
276 | ||
277 | static bool __mptcp_move_skb(struct mptcp_sock *msk, struct sock *ssk, | |
278 | struct sk_buff *skb, unsigned int offset, | |
279 | size_t copy_len) | |
6771bfd9 | 280 | { |
ab174ad8 | 281 | struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); |
6771bfd9 | 282 | struct sock *sk = (struct sock *)msk; |
4e637c70 | 283 | struct sk_buff *tail; |
6771bfd9 FW |
284 | |
285 | __skb_unlink(skb, &ssk->sk_receive_queue); | |
6771bfd9 | 286 | |
4e637c70 FW |
287 | skb_ext_reset(skb); |
288 | skb_orphan(skb); | |
ab174ad8 | 289 | |
9c3f94e1 PA |
290 | /* try to fetch required memory from subflow */ |
291 | if (!sk_rmem_schedule(sk, skb, skb->truesize)) { | |
292 | if (ssk->sk_forward_alloc < skb->truesize) | |
293 | goto drop; | |
294 | __sk_mem_reclaim(ssk, skb->truesize); | |
295 | if (!sk_rmem_schedule(sk, skb, skb->truesize)) | |
296 | goto drop; | |
297 | } | |
298 | ||
ab174ad8 PA |
299 | /* the skb map_seq accounts for the skb offset: |
300 | * mptcp_subflow_get_mapped_dsn() is based on the current tp->copied_seq | |
301 | * value | |
302 | */ | |
303 | MPTCP_SKB_CB(skb)->map_seq = mptcp_subflow_get_mapped_dsn(subflow); | |
304 | MPTCP_SKB_CB(skb)->end_seq = MPTCP_SKB_CB(skb)->map_seq + copy_len; | |
8268ed4c | 305 | MPTCP_SKB_CB(skb)->offset = offset; |
4e637c70 | 306 | |
ab174ad8 PA |
307 | if (MPTCP_SKB_CB(skb)->map_seq == msk->ack_seq) { |
308 | /* in sequence */ | |
8b0308fe | 309 | WRITE_ONCE(msk->ack_seq, msk->ack_seq + copy_len); |
ab174ad8 PA |
310 | tail = skb_peek_tail(&sk->sk_receive_queue); |
311 | if (tail && mptcp_try_coalesce(sk, tail, skb)) | |
312 | return true; | |
4e637c70 | 313 | |
ab174ad8 PA |
314 | skb_set_owner_r(skb, sk); |
315 | __skb_queue_tail(&sk->sk_receive_queue, skb); | |
316 | return true; | |
317 | } else if (after64(MPTCP_SKB_CB(skb)->map_seq, msk->ack_seq)) { | |
318 | mptcp_data_queue_ofo(msk, skb); | |
319 | return false; | |
320 | } | |
321 | ||
322 | /* old data, keep it simple and drop the whole pkt, sender | |
323 | * will retransmit as needed, if needed. | |
324 | */ | |
06242e44 | 325 | MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_DUPDATA); |
9c3f94e1 | 326 | drop: |
ab174ad8 PA |
327 | mptcp_drop(sk, skb); |
328 | return false; | |
6771bfd9 FW |
329 | } |
330 | ||
16a9a9da MM |
331 | static void mptcp_stop_timer(struct sock *sk) |
332 | { | |
333 | struct inet_connection_sock *icsk = inet_csk(sk); | |
334 | ||
335 | sk_stop_timer(sk, &icsk->icsk_retransmit_timer); | |
336 | mptcp_sk(sk)->timer_ival = 0; | |
337 | } | |
338 | ||
e16163b6 PA |
339 | static void mptcp_close_wake_up(struct sock *sk) |
340 | { | |
341 | if (sock_flag(sk, SOCK_DEAD)) | |
342 | return; | |
343 | ||
344 | sk->sk_state_change(sk); | |
345 | if (sk->sk_shutdown == SHUTDOWN_MASK || | |
346 | sk->sk_state == TCP_CLOSE) | |
347 | sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_HUP); | |
348 | else | |
349 | sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN); | |
350 | } | |
351 | ||
6e628cd3 | 352 | static bool mptcp_pending_data_fin_ack(struct sock *sk) |
16a9a9da MM |
353 | { |
354 | struct mptcp_sock *msk = mptcp_sk(sk); | |
355 | ||
6e628cd3 PA |
356 | return !__mptcp_check_fallback(msk) && |
357 | ((1 << sk->sk_state) & | |
358 | (TCPF_FIN_WAIT1 | TCPF_CLOSING | TCPF_LAST_ACK)) && | |
359 | msk->write_seq == READ_ONCE(msk->snd_una); | |
360 | } | |
361 | ||
362 | static void mptcp_check_data_fin_ack(struct sock *sk) | |
363 | { | |
364 | struct mptcp_sock *msk = mptcp_sk(sk); | |
16a9a9da MM |
365 | |
366 | /* Look for an acknowledged DATA_FIN */ | |
6e628cd3 | 367 | if (mptcp_pending_data_fin_ack(sk)) { |
16a9a9da MM |
368 | WRITE_ONCE(msk->snd_data_fin_enable, 0); |
369 | ||
370 | switch (sk->sk_state) { | |
371 | case TCP_FIN_WAIT1: | |
372 | inet_sk_state_store(sk, TCP_FIN_WAIT2); | |
16a9a9da MM |
373 | break; |
374 | case TCP_CLOSING: | |
16a9a9da MM |
375 | case TCP_LAST_ACK: |
376 | inet_sk_state_store(sk, TCP_CLOSE); | |
16a9a9da MM |
377 | break; |
378 | } | |
379 | ||
e16163b6 | 380 | mptcp_close_wake_up(sk); |
16a9a9da MM |
381 | } |
382 | } | |
383 | ||
3721b9b6 MM |
384 | static bool mptcp_pending_data_fin(struct sock *sk, u64 *seq) |
385 | { | |
386 | struct mptcp_sock *msk = mptcp_sk(sk); | |
387 | ||
388 | if (READ_ONCE(msk->rcv_data_fin) && | |
389 | ((1 << sk->sk_state) & | |
390 | (TCPF_ESTABLISHED | TCPF_FIN_WAIT1 | TCPF_FIN_WAIT2))) { | |
391 | u64 rcv_data_fin_seq = READ_ONCE(msk->rcv_data_fin_seq); | |
392 | ||
393 | if (msk->ack_seq == rcv_data_fin_seq) { | |
394 | if (seq) | |
395 | *seq = rcv_data_fin_seq; | |
396 | ||
397 | return true; | |
398 | } | |
399 | } | |
400 | ||
401 | return false; | |
402 | } | |
403 | ||
404 | static void mptcp_set_timeout(const struct sock *sk, const struct sock *ssk) | |
405 | { | |
406 | long tout = ssk && inet_csk(ssk)->icsk_pending ? | |
407 | inet_csk(ssk)->icsk_timeout - jiffies : 0; | |
408 | ||
409 | if (tout <= 0) | |
410 | tout = mptcp_sk(sk)->timer_ival; | |
411 | mptcp_sk(sk)->timer_ival = tout > 0 ? tout : TCP_RTO_MIN; | |
412 | } | |
413 | ||
ea4ca586 PA |
414 | static bool mptcp_subflow_active(struct mptcp_subflow_context *subflow) |
415 | { | |
416 | struct sock *ssk = mptcp_subflow_tcp_sock(subflow); | |
417 | ||
418 | /* can't send if JOIN hasn't completed yet (i.e. is usable for mptcp) */ | |
419 | if (subflow->request_join && !subflow->fully_established) | |
420 | return false; | |
421 | ||
422 | /* only send if our side has not closed yet */ | |
423 | return ((1 << ssk->sk_state) & (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)); | |
424 | } | |
425 | ||
fd897679 PA |
426 | static bool tcp_can_send_ack(const struct sock *ssk) |
427 | { | |
428 | return !((1 << inet_sk_state_load(ssk)) & | |
20bc80b6 | 429 | (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_TIME_WAIT | TCPF_CLOSE | TCPF_LISTEN)); |
fd897679 PA |
430 | } |
431 | ||
432 | static void mptcp_send_ack(struct mptcp_sock *msk) | |
7ed90803 PA |
433 | { |
434 | struct mptcp_subflow_context *subflow; | |
435 | ||
436 | mptcp_for_each_subflow(msk, subflow) { | |
437 | struct sock *ssk = mptcp_subflow_tcp_sock(subflow); | |
438 | ||
fd897679 PA |
439 | lock_sock(ssk); |
440 | if (tcp_can_send_ack(ssk)) | |
ea4ca586 | 441 | tcp_send_ack(ssk); |
fd897679 | 442 | release_sock(ssk); |
ea4ca586 | 443 | } |
fd897679 PA |
444 | } |
445 | ||
446 | static bool mptcp_subflow_cleanup_rbuf(struct sock *ssk) | |
447 | { | |
448 | int ret; | |
449 | ||
450 | lock_sock(ssk); | |
451 | ret = tcp_can_send_ack(ssk); | |
452 | if (ret) | |
453 | tcp_cleanup_rbuf(ssk, 1); | |
454 | release_sock(ssk); | |
455 | return ret; | |
456 | } | |
457 | ||
458 | static void mptcp_cleanup_rbuf(struct mptcp_sock *msk) | |
459 | { | |
87952603 | 460 | struct sock *ack_hint = READ_ONCE(msk->ack_hint); |
e3859603 | 461 | int old_space = READ_ONCE(msk->old_wspace); |
fd897679 | 462 | struct mptcp_subflow_context *subflow; |
e3859603 PA |
463 | struct sock *sk = (struct sock *)msk; |
464 | bool cleanup; | |
465 | ||
466 | /* this is a simple superset of what tcp_cleanup_rbuf() implements | |
467 | * so that we don't have to acquire the ssk socket lock most of the time | |
468 | * to do actually nothing | |
469 | */ | |
470 | cleanup = __mptcp_space(sk) - old_space >= max(0, old_space); | |
471 | if (!cleanup) | |
472 | return; | |
fd897679 PA |
473 | |
474 | /* if the hinted ssk is still active, try to use it */ | |
87952603 | 475 | if (likely(ack_hint)) { |
fd897679 PA |
476 | mptcp_for_each_subflow(msk, subflow) { |
477 | struct sock *ssk = mptcp_subflow_tcp_sock(subflow); | |
478 | ||
87952603 | 479 | if (ack_hint == ssk && mptcp_subflow_cleanup_rbuf(ssk)) |
fd897679 PA |
480 | return; |
481 | } | |
7ed90803 | 482 | } |
fd897679 PA |
483 | |
484 | /* otherwise pick the first active subflow */ | |
485 | mptcp_for_each_subflow(msk, subflow) | |
486 | if (mptcp_subflow_cleanup_rbuf(mptcp_subflow_tcp_sock(subflow))) | |
487 | return; | |
7ed90803 PA |
488 | } |
489 | ||
490 | static bool mptcp_check_data_fin(struct sock *sk) | |
3721b9b6 MM |
491 | { |
492 | struct mptcp_sock *msk = mptcp_sk(sk); | |
493 | u64 rcv_data_fin_seq; | |
7ed90803 | 494 | bool ret = false; |
3721b9b6 MM |
495 | |
496 | if (__mptcp_check_fallback(msk) || !msk->first) | |
7ed90803 | 497 | return ret; |
3721b9b6 MM |
498 | |
499 | /* Need to ack a DATA_FIN received from a peer while this side | |
500 | * of the connection is in ESTABLISHED, FIN_WAIT1, or FIN_WAIT2. | |
501 | * msk->rcv_data_fin was set when parsing the incoming options | |
502 | * at the subflow level and the msk lock was not held, so this | |
503 | * is the first opportunity to act on the DATA_FIN and change | |
504 | * the msk state. | |
505 | * | |
506 | * If we are caught up to the sequence number of the incoming | |
507 | * DATA_FIN, send the DATA_ACK now and do state transition. If | |
508 | * not caught up, do nothing and let the recv code send DATA_ACK | |
509 | * when catching up. | |
510 | */ | |
511 | ||
512 | if (mptcp_pending_data_fin(sk, &rcv_data_fin_seq)) { | |
917944da | 513 | WRITE_ONCE(msk->ack_seq, msk->ack_seq + 1); |
3721b9b6 MM |
514 | WRITE_ONCE(msk->rcv_data_fin, 0); |
515 | ||
516 | sk->sk_shutdown |= RCV_SHUTDOWN; | |
16a9a9da MM |
517 | smp_mb__before_atomic(); /* SHUTDOWN must be visible first */ |
518 | set_bit(MPTCP_DATA_READY, &msk->flags); | |
3721b9b6 MM |
519 | |
520 | switch (sk->sk_state) { | |
521 | case TCP_ESTABLISHED: | |
522 | inet_sk_state_store(sk, TCP_CLOSE_WAIT); | |
523 | break; | |
524 | case TCP_FIN_WAIT1: | |
525 | inet_sk_state_store(sk, TCP_CLOSING); | |
526 | break; | |
527 | case TCP_FIN_WAIT2: | |
528 | inet_sk_state_store(sk, TCP_CLOSE); | |
3721b9b6 MM |
529 | break; |
530 | default: | |
531 | /* Other states not expected */ | |
532 | WARN_ON_ONCE(1); | |
533 | break; | |
534 | } | |
535 | ||
7ed90803 | 536 | ret = true; |
3721b9b6 | 537 | mptcp_set_timeout(sk, NULL); |
fd897679 | 538 | mptcp_send_ack(msk); |
e16163b6 | 539 | mptcp_close_wake_up(sk); |
3721b9b6 | 540 | } |
7ed90803 | 541 | return ret; |
3721b9b6 MM |
542 | } |
543 | ||
6771bfd9 FW |
544 | static bool __mptcp_move_skbs_from_subflow(struct mptcp_sock *msk, |
545 | struct sock *ssk, | |
546 | unsigned int *bytes) | |
547 | { | |
548 | struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); | |
600911ff | 549 | struct sock *sk = (struct sock *)msk; |
6771bfd9 FW |
550 | unsigned int moved = 0; |
551 | bool more_data_avail; | |
552 | struct tcp_sock *tp; | |
553 | bool done = false; | |
13c7ba0c FW |
554 | int sk_rbuf; |
555 | ||
556 | sk_rbuf = READ_ONCE(sk->sk_rcvbuf); | |
557 | ||
558 | if (!(sk->sk_userlocks & SOCK_RCVBUF_LOCK)) { | |
559 | int ssk_rbuf = READ_ONCE(ssk->sk_rcvbuf); | |
560 | ||
561 | if (unlikely(ssk_rbuf > sk_rbuf)) { | |
562 | WRITE_ONCE(sk->sk_rcvbuf, ssk_rbuf); | |
563 | sk_rbuf = ssk_rbuf; | |
564 | } | |
565 | } | |
600911ff | 566 | |
ab174ad8 | 567 | pr_debug("msk=%p ssk=%p", msk, ssk); |
6771bfd9 FW |
568 | tp = tcp_sk(ssk); |
569 | do { | |
570 | u32 map_remaining, offset; | |
571 | u32 seq = tp->copied_seq; | |
572 | struct sk_buff *skb; | |
573 | bool fin; | |
574 | ||
575 | /* try to move as much data as available */ | |
576 | map_remaining = subflow->map_data_len - | |
577 | mptcp_subflow_get_map_offset(subflow); | |
578 | ||
579 | skb = skb_peek(&ssk->sk_receive_queue); | |
d9fb8c50 PA |
580 | if (!skb) { |
581 | /* if no data is found, a racing workqueue/recvmsg | |
582 | * already processed the new data, stop here or we | |
583 | * can enter an infinite loop | |
584 | */ | |
585 | if (!moved) | |
586 | done = true; | |
6771bfd9 | 587 | break; |
d9fb8c50 | 588 | } |
6771bfd9 | 589 | |
e1ff9e82 DC |
590 | if (__mptcp_check_fallback(msk)) { |
591 | /* if we are running under the workqueue, TCP could have | |
592 | * collapsed skbs between dummy map creation and now | |
593 | * be sure to adjust the size | |
594 | */ | |
595 | map_remaining = skb->len; | |
596 | subflow->map_data_len = skb->len; | |
597 | } | |
598 | ||
6771bfd9 FW |
599 | offset = seq - TCP_SKB_CB(skb)->seq; |
600 | fin = TCP_SKB_CB(skb)->tcp_flags & TCPHDR_FIN; | |
601 | if (fin) { | |
602 | done = true; | |
603 | seq++; | |
604 | } | |
605 | ||
606 | if (offset < skb->len) { | |
607 | size_t len = skb->len - offset; | |
608 | ||
609 | if (tp->urg_data) | |
610 | done = true; | |
611 | ||
ab174ad8 PA |
612 | if (__mptcp_move_skb(msk, ssk, skb, offset, len)) |
613 | moved += len; | |
6771bfd9 | 614 | seq += len; |
6771bfd9 FW |
615 | |
616 | if (WARN_ON_ONCE(map_remaining < len)) | |
617 | break; | |
618 | } else { | |
619 | WARN_ON_ONCE(!fin); | |
620 | sk_eat_skb(ssk, skb); | |
621 | done = true; | |
622 | } | |
623 | ||
624 | WRITE_ONCE(tp->copied_seq, seq); | |
625 | more_data_avail = mptcp_subflow_data_available(ssk); | |
600911ff | 626 | |
13c7ba0c | 627 | if (atomic_read(&sk->sk_rmem_alloc) > sk_rbuf) { |
600911ff FW |
628 | done = true; |
629 | break; | |
630 | } | |
6771bfd9 | 631 | } while (more_data_avail); |
87952603 | 632 | WRITE_ONCE(msk->ack_hint, ssk); |
6771bfd9 | 633 | |
6719331c | 634 | *bytes += moved; |
6771bfd9 FW |
635 | return done; |
636 | } | |
637 | ||
87952603 | 638 | static bool __mptcp_ofo_queue(struct mptcp_sock *msk) |
ab174ad8 PA |
639 | { |
640 | struct sock *sk = (struct sock *)msk; | |
641 | struct sk_buff *skb, *tail; | |
642 | bool moved = false; | |
643 | struct rb_node *p; | |
644 | u64 end_seq; | |
645 | ||
646 | p = rb_first(&msk->out_of_order_queue); | |
06242e44 | 647 | pr_debug("msk=%p empty=%d", msk, RB_EMPTY_ROOT(&msk->out_of_order_queue)); |
ab174ad8 PA |
648 | while (p) { |
649 | skb = rb_to_skb(p); | |
650 | if (after64(MPTCP_SKB_CB(skb)->map_seq, msk->ack_seq)) | |
651 | break; | |
652 | ||
653 | p = rb_next(p); | |
654 | rb_erase(&skb->rbnode, &msk->out_of_order_queue); | |
655 | ||
656 | if (unlikely(!after64(MPTCP_SKB_CB(skb)->end_seq, | |
657 | msk->ack_seq))) { | |
658 | mptcp_drop(sk, skb); | |
06242e44 | 659 | MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_DUPDATA); |
ab174ad8 PA |
660 | continue; |
661 | } | |
662 | ||
663 | end_seq = MPTCP_SKB_CB(skb)->end_seq; | |
664 | tail = skb_peek_tail(&sk->sk_receive_queue); | |
665 | if (!tail || !mptcp_ooo_try_coalesce(msk, tail, skb)) { | |
666 | int delta = msk->ack_seq - MPTCP_SKB_CB(skb)->map_seq; | |
667 | ||
668 | /* skip overlapping data, if any */ | |
06242e44 PA |
669 | pr_debug("uncoalesced seq=%llx ack seq=%llx delta=%d", |
670 | MPTCP_SKB_CB(skb)->map_seq, msk->ack_seq, | |
671 | delta); | |
ab174ad8 PA |
672 | MPTCP_SKB_CB(skb)->offset += delta; |
673 | __skb_queue_tail(&sk->sk_receive_queue, skb); | |
674 | } | |
675 | msk->ack_seq = end_seq; | |
676 | moved = true; | |
677 | } | |
678 | return moved; | |
679 | } | |
680 | ||
2e52213c FW |
681 | /* In most cases we will be able to lock the mptcp socket. If its already |
682 | * owned, we need to defer to the work queue to avoid ABBA deadlock. | |
683 | */ | |
87952603 | 684 | static void move_skbs_to_msk(struct mptcp_sock *msk, struct sock *ssk) |
2e52213c FW |
685 | { |
686 | struct sock *sk = (struct sock *)msk; | |
687 | unsigned int moved = 0; | |
688 | ||
87952603 PA |
689 | if (inet_sk_state_load(sk) == TCP_CLOSE) |
690 | return; | |
ab174ad8 | 691 | |
87952603 | 692 | mptcp_data_lock(sk); |
2e52213c | 693 | |
87952603 PA |
694 | __mptcp_move_skbs_from_subflow(msk, ssk, &moved); |
695 | __mptcp_ofo_queue(msk); | |
2e52213c | 696 | |
87952603 PA |
697 | /* If the moves have caught up with the DATA_FIN sequence number |
698 | * it's time to ack the DATA_FIN and change socket state, but | |
699 | * this is not a good place to change state. Let the workqueue | |
700 | * do it. | |
701 | */ | |
702 | if (mptcp_pending_data_fin(sk, NULL)) | |
703 | mptcp_schedule_work(sk); | |
704 | mptcp_data_unlock(sk); | |
2e52213c FW |
705 | } |
706 | ||
707 | void mptcp_data_ready(struct sock *sk, struct sock *ssk) | |
101f6f85 | 708 | { |
6719331c | 709 | struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); |
101f6f85 | 710 | struct mptcp_sock *msk = mptcp_sk(sk); |
13c7ba0c | 711 | int sk_rbuf, ssk_rbuf; |
6719331c | 712 | bool wake; |
101f6f85 | 713 | |
d7b1bfd0 PA |
714 | /* The peer can send data while we are shutting down this |
715 | * subflow at msk destruction time, but we must avoid enqueuing | |
716 | * more data to the msk receive queue | |
717 | */ | |
718 | if (unlikely(subflow->disposable)) | |
719 | return; | |
720 | ||
6719331c PA |
721 | /* move_skbs_to_msk below can legitly clear the data_avail flag, |
722 | * but we will need later to properly woke the reader, cache its | |
723 | * value | |
724 | */ | |
725 | wake = subflow->data_avail == MPTCP_SUBFLOW_DATA_AVAIL; | |
726 | if (wake) | |
727 | set_bit(MPTCP_DATA_READY, &msk->flags); | |
6771bfd9 | 728 | |
13c7ba0c FW |
729 | ssk_rbuf = READ_ONCE(ssk->sk_rcvbuf); |
730 | sk_rbuf = READ_ONCE(sk->sk_rcvbuf); | |
731 | if (unlikely(ssk_rbuf > sk_rbuf)) | |
732 | sk_rbuf = ssk_rbuf; | |
733 | ||
734 | /* over limit? can't append more skbs to msk */ | |
735 | if (atomic_read(&sk->sk_rmem_alloc) > sk_rbuf) | |
2e52213c FW |
736 | goto wake; |
737 | ||
ea4ca586 | 738 | move_skbs_to_msk(msk, ssk); |
600911ff | 739 | |
600911ff | 740 | wake: |
6719331c PA |
741 | if (wake) |
742 | sk->sk_data_ready(sk); | |
101f6f85 FW |
743 | } |
744 | ||
84dfe367 | 745 | void __mptcp_flush_join_list(struct mptcp_sock *msk) |
ec3edaa7 | 746 | { |
5cf92bba PA |
747 | struct mptcp_subflow_context *subflow; |
748 | ||
ec3edaa7 PK |
749 | if (likely(list_empty(&msk->join_list))) |
750 | return; | |
751 | ||
752 | spin_lock_bh(&msk->join_list_lock); | |
5cf92bba PA |
753 | list_for_each_entry(subflow, &msk->join_list, node) |
754 | mptcp_propagate_sndbuf((struct sock *)msk, mptcp_subflow_tcp_sock(subflow)); | |
ec3edaa7 PK |
755 | list_splice_tail_init(&msk->join_list, &msk->conn_list); |
756 | spin_unlock_bh(&msk->join_list_lock); | |
757 | } | |
758 | ||
b51f9b80 PA |
759 | static bool mptcp_timer_pending(struct sock *sk) |
760 | { | |
761 | return timer_pending(&inet_csk(sk)->icsk_retransmit_timer); | |
762 | } | |
763 | ||
764 | static void mptcp_reset_timer(struct sock *sk) | |
765 | { | |
766 | struct inet_connection_sock *icsk = inet_csk(sk); | |
767 | unsigned long tout; | |
768 | ||
e16163b6 PA |
769 | /* prevent rescheduling on close */ |
770 | if (unlikely(inet_sk_state_load(sk) == TCP_CLOSE)) | |
771 | return; | |
772 | ||
b51f9b80 PA |
773 | /* should never be called with mptcp level timer cleared */ |
774 | tout = READ_ONCE(mptcp_sk(sk)->timer_ival); | |
775 | if (WARN_ON_ONCE(!tout)) | |
776 | tout = TCP_RTO_MIN; | |
777 | sk_reset_timer(sk, &icsk->icsk_retransmit_timer, jiffies + tout); | |
778 | } | |
779 | ||
ba8f48f7 PA |
780 | bool mptcp_schedule_work(struct sock *sk) |
781 | { | |
782 | if (inet_sk_state_load(sk) != TCP_CLOSE && | |
783 | schedule_work(&mptcp_sk(sk)->work)) { | |
784 | /* each subflow already holds a reference to the sk, and the | |
785 | * workqueue is invoked by a subflow, so sk can't go away here. | |
786 | */ | |
787 | sock_hold(sk); | |
788 | return true; | |
789 | } | |
790 | return false; | |
791 | } | |
792 | ||
59832e24 FW |
793 | void mptcp_subflow_eof(struct sock *sk) |
794 | { | |
ba8f48f7 PA |
795 | if (!test_and_set_bit(MPTCP_WORK_EOF, &mptcp_sk(sk)->flags)) |
796 | mptcp_schedule_work(sk); | |
59832e24 FW |
797 | } |
798 | ||
5969856a PA |
799 | static void mptcp_check_for_eof(struct mptcp_sock *msk) |
800 | { | |
801 | struct mptcp_subflow_context *subflow; | |
802 | struct sock *sk = (struct sock *)msk; | |
803 | int receivers = 0; | |
804 | ||
805 | mptcp_for_each_subflow(msk, subflow) | |
806 | receivers += !subflow->rx_eof; | |
e16163b6 PA |
807 | if (receivers) |
808 | return; | |
5969856a | 809 | |
e16163b6 | 810 | if (!(sk->sk_shutdown & RCV_SHUTDOWN)) { |
5969856a PA |
811 | /* hopefully temporary hack: propagate shutdown status |
812 | * to msk, when all subflows agree on it | |
813 | */ | |
814 | sk->sk_shutdown |= RCV_SHUTDOWN; | |
815 | ||
816 | smp_mb__before_atomic(); /* SHUTDOWN must be visible first */ | |
817 | set_bit(MPTCP_DATA_READY, &msk->flags); | |
818 | sk->sk_data_ready(sk); | |
819 | } | |
e16163b6 PA |
820 | |
821 | switch (sk->sk_state) { | |
822 | case TCP_ESTABLISHED: | |
823 | inet_sk_state_store(sk, TCP_CLOSE_WAIT); | |
824 | break; | |
825 | case TCP_FIN_WAIT1: | |
26aa2314 PA |
826 | inet_sk_state_store(sk, TCP_CLOSING); |
827 | break; | |
828 | case TCP_FIN_WAIT2: | |
e16163b6 PA |
829 | inet_sk_state_store(sk, TCP_CLOSE); |
830 | break; | |
831 | default: | |
832 | return; | |
833 | } | |
834 | mptcp_close_wake_up(sk); | |
5969856a PA |
835 | } |
836 | ||
7a6a6cbc PA |
837 | static struct sock *mptcp_subflow_recv_lookup(const struct mptcp_sock *msk) |
838 | { | |
839 | struct mptcp_subflow_context *subflow; | |
840 | struct sock *sk = (struct sock *)msk; | |
841 | ||
842 | sock_owned_by_me(sk); | |
843 | ||
844 | mptcp_for_each_subflow(msk, subflow) { | |
845 | if (subflow->data_avail) | |
846 | return mptcp_subflow_tcp_sock(subflow); | |
847 | } | |
848 | ||
849 | return NULL; | |
850 | } | |
851 | ||
3f8e0aae PA |
852 | static bool mptcp_skb_can_collapse_to(u64 write_seq, |
853 | const struct sk_buff *skb, | |
854 | const struct mptcp_ext *mpext) | |
57040755 PA |
855 | { |
856 | if (!tcp_skb_can_collapse_to(skb)) | |
857 | return false; | |
858 | ||
5a369ca6 PA |
859 | /* can collapse only if MPTCP level sequence is in order and this |
860 | * mapping has not been xmitted yet | |
861 | */ | |
862 | return mpext && mpext->data_seq + mpext->data_len == write_seq && | |
863 | !mpext->frozen; | |
57040755 PA |
864 | } |
865 | ||
18b683bf PA |
866 | static bool mptcp_frag_can_collapse_to(const struct mptcp_sock *msk, |
867 | const struct page_frag *pfrag, | |
868 | const struct mptcp_data_frag *df) | |
869 | { | |
870 | return df && pfrag->page == df->page && | |
d9ca1de8 | 871 | pfrag->size - pfrag->offset > 0 && |
18b683bf PA |
872 | df->data_seq + df->data_len == msk->write_seq; |
873 | } | |
874 | ||
724cfd2e | 875 | static int mptcp_wmem_with_overhead(struct sock *sk, int size) |
e93da928 | 876 | { |
724cfd2e PA |
877 | struct mptcp_sock *msk = mptcp_sk(sk); |
878 | int ret, skbs; | |
879 | ||
880 | ret = size + ((sizeof(struct mptcp_data_frag) * size) >> PAGE_SHIFT); | |
881 | skbs = (msk->tx_pending_data + size) / msk->size_goal_cache; | |
882 | if (skbs < msk->skb_tx_cache.qlen) | |
883 | return ret; | |
884 | ||
885 | return ret + (skbs - msk->skb_tx_cache.qlen) * SKB_TRUESIZE(MAX_TCP_HEADER); | |
e93da928 PA |
886 | } |
887 | ||
888 | static void __mptcp_wmem_reserve(struct sock *sk, int size) | |
889 | { | |
724cfd2e | 890 | int amount = mptcp_wmem_with_overhead(sk, size); |
e93da928 PA |
891 | struct mptcp_sock *msk = mptcp_sk(sk); |
892 | ||
893 | WARN_ON_ONCE(msk->wmem_reserved); | |
e7579d5d DC |
894 | if (WARN_ON_ONCE(amount < 0)) |
895 | amount = 0; | |
896 | ||
e93da928 PA |
897 | if (amount <= sk->sk_forward_alloc) |
898 | goto reserve; | |
899 | ||
900 | /* under memory pressure try to reserve at most a single page | |
901 | * otherwise try to reserve the full estimate and fallback | |
902 | * to a single page before entering the error path | |
903 | */ | |
904 | if ((tcp_under_memory_pressure(sk) && amount > PAGE_SIZE) || | |
905 | !sk_wmem_schedule(sk, amount)) { | |
906 | if (amount <= PAGE_SIZE) | |
907 | goto nomem; | |
908 | ||
909 | amount = PAGE_SIZE; | |
910 | if (!sk_wmem_schedule(sk, amount)) | |
911 | goto nomem; | |
912 | } | |
913 | ||
914 | reserve: | |
915 | msk->wmem_reserved = amount; | |
916 | sk->sk_forward_alloc -= amount; | |
917 | return; | |
918 | ||
919 | nomem: | |
920 | /* we will wait for memory on next allocation */ | |
921 | msk->wmem_reserved = -1; | |
922 | } | |
923 | ||
924 | static void __mptcp_update_wmem(struct sock *sk) | |
925 | { | |
926 | struct mptcp_sock *msk = mptcp_sk(sk); | |
927 | ||
928 | if (!msk->wmem_reserved) | |
929 | return; | |
930 | ||
931 | if (msk->wmem_reserved < 0) | |
932 | msk->wmem_reserved = 0; | |
933 | if (msk->wmem_reserved > 0) { | |
934 | sk->sk_forward_alloc += msk->wmem_reserved; | |
935 | msk->wmem_reserved = 0; | |
936 | } | |
937 | } | |
938 | ||
939 | static bool mptcp_wmem_alloc(struct sock *sk, int size) | |
940 | { | |
941 | struct mptcp_sock *msk = mptcp_sk(sk); | |
942 | ||
943 | /* check for pre-existing error condition */ | |
944 | if (msk->wmem_reserved < 0) | |
945 | return false; | |
946 | ||
947 | if (msk->wmem_reserved >= size) | |
948 | goto account; | |
949 | ||
87952603 PA |
950 | mptcp_data_lock(sk); |
951 | if (!sk_wmem_schedule(sk, size)) { | |
952 | mptcp_data_unlock(sk); | |
e93da928 | 953 | return false; |
87952603 | 954 | } |
e93da928 PA |
955 | |
956 | sk->sk_forward_alloc -= size; | |
957 | msk->wmem_reserved += size; | |
87952603 | 958 | mptcp_data_unlock(sk); |
e93da928 PA |
959 | |
960 | account: | |
961 | msk->wmem_reserved -= size; | |
962 | return true; | |
963 | } | |
964 | ||
87952603 PA |
965 | static void mptcp_wmem_uncharge(struct sock *sk, int size) |
966 | { | |
967 | struct mptcp_sock *msk = mptcp_sk(sk); | |
968 | ||
969 | if (msk->wmem_reserved < 0) | |
970 | msk->wmem_reserved = 0; | |
971 | msk->wmem_reserved += size; | |
972 | } | |
973 | ||
724cfd2e PA |
974 | static void mptcp_mem_reclaim_partial(struct sock *sk) |
975 | { | |
976 | struct mptcp_sock *msk = mptcp_sk(sk); | |
977 | ||
978 | /* if we are experiencing a transint allocation error, | |
979 | * the forward allocation memory has been already | |
980 | * released | |
981 | */ | |
982 | if (msk->wmem_reserved < 0) | |
983 | return; | |
984 | ||
985 | mptcp_data_lock(sk); | |
986 | sk->sk_forward_alloc += msk->wmem_reserved; | |
987 | sk_mem_reclaim_partial(sk); | |
988 | msk->wmem_reserved = sk->sk_forward_alloc; | |
989 | sk->sk_forward_alloc = 0; | |
990 | mptcp_data_unlock(sk); | |
991 | } | |
992 | ||
d027236c PA |
993 | static void dfrag_uncharge(struct sock *sk, int len) |
994 | { | |
995 | sk_mem_uncharge(sk, len); | |
7948f6cc | 996 | sk_wmem_queued_add(sk, -len); |
d027236c PA |
997 | } |
998 | ||
999 | static void dfrag_clear(struct sock *sk, struct mptcp_data_frag *dfrag) | |
18b683bf | 1000 | { |
d027236c PA |
1001 | int len = dfrag->data_len + dfrag->overhead; |
1002 | ||
18b683bf | 1003 | list_del(&dfrag->list); |
d027236c | 1004 | dfrag_uncharge(sk, len); |
18b683bf PA |
1005 | put_page(dfrag->page); |
1006 | } | |
1007 | ||
6e628cd3 | 1008 | static void __mptcp_clean_una(struct sock *sk) |
18b683bf PA |
1009 | { |
1010 | struct mptcp_sock *msk = mptcp_sk(sk); | |
1011 | struct mptcp_data_frag *dtmp, *dfrag; | |
d027236c | 1012 | bool cleaned = false; |
e1ff9e82 DC |
1013 | u64 snd_una; |
1014 | ||
1015 | /* on fallback we just need to ignore snd_una, as this is really | |
1016 | * plain TCP | |
1017 | */ | |
1018 | if (__mptcp_check_fallback(msk)) | |
7439d687 | 1019 | msk->snd_una = READ_ONCE(msk->snd_nxt); |
6f8a612a | 1020 | |
7439d687 | 1021 | snd_una = msk->snd_una; |
18b683bf PA |
1022 | list_for_each_entry_safe(dfrag, dtmp, &msk->rtx_queue, list) { |
1023 | if (after64(dfrag->data_seq + dfrag->data_len, snd_una)) | |
1024 | break; | |
1025 | ||
d9ca1de8 PA |
1026 | if (WARN_ON_ONCE(dfrag == msk->first_pending)) |
1027 | break; | |
d027236c PA |
1028 | dfrag_clear(sk, dfrag); |
1029 | cleaned = true; | |
1030 | } | |
1031 | ||
7948f6cc FW |
1032 | dfrag = mptcp_rtx_head(sk); |
1033 | if (dfrag && after64(snd_una, dfrag->data_seq)) { | |
53eb4c38 PA |
1034 | u64 delta = snd_una - dfrag->data_seq; |
1035 | ||
d9ca1de8 | 1036 | if (WARN_ON_ONCE(delta > dfrag->already_sent)) |
53eb4c38 | 1037 | goto out; |
7948f6cc FW |
1038 | |
1039 | dfrag->data_seq += delta; | |
53eb4c38 | 1040 | dfrag->offset += delta; |
7948f6cc | 1041 | dfrag->data_len -= delta; |
d9ca1de8 | 1042 | dfrag->already_sent -= delta; |
7948f6cc FW |
1043 | |
1044 | dfrag_uncharge(sk, delta); | |
1045 | cleaned = true; | |
1046 | } | |
1047 | ||
53eb4c38 | 1048 | out: |
6e628cd3 PA |
1049 | if (cleaned) { |
1050 | if (tcp_under_memory_pressure(sk)) { | |
1051 | __mptcp_update_wmem(sk); | |
1052 | sk_mem_reclaim_partial(sk); | |
1053 | } | |
6e628cd3 | 1054 | } |
95ed690e | 1055 | |
6e628cd3 PA |
1056 | if (snd_una == READ_ONCE(msk->snd_nxt)) { |
1057 | if (msk->timer_ival) | |
1058 | mptcp_stop_timer(sk); | |
1059 | } else { | |
1060 | mptcp_reset_timer(sk); | |
18b683bf PA |
1061 | } |
1062 | } | |
1063 | ||
724cfd2e | 1064 | static void mptcp_enter_memory_pressure(struct sock *sk) |
18b683bf | 1065 | { |
d9ca1de8 PA |
1066 | struct mptcp_subflow_context *subflow; |
1067 | struct mptcp_sock *msk = mptcp_sk(sk); | |
1068 | bool first = true; | |
1069 | ||
18b683bf | 1070 | sk_stream_moderate_sndbuf(sk); |
d9ca1de8 PA |
1071 | mptcp_for_each_subflow(msk, subflow) { |
1072 | struct sock *ssk = mptcp_subflow_tcp_sock(subflow); | |
1073 | ||
1074 | if (first) | |
1075 | tcp_enter_memory_pressure(ssk); | |
1076 | sk_stream_moderate_sndbuf(ssk); | |
1077 | first = false; | |
1078 | } | |
724cfd2e PA |
1079 | } |
1080 | ||
1081 | /* ensure we get enough memory for the frag hdr, beyond some minimal amount of | |
1082 | * data | |
1083 | */ | |
1084 | static bool mptcp_page_frag_refill(struct sock *sk, struct page_frag *pfrag) | |
1085 | { | |
1086 | if (likely(skb_page_frag_refill(32U + sizeof(struct mptcp_data_frag), | |
1087 | pfrag, sk->sk_allocation))) | |
1088 | return true; | |
1089 | ||
1090 | mptcp_enter_memory_pressure(sk); | |
18b683bf PA |
1091 | return false; |
1092 | } | |
1093 | ||
1094 | static struct mptcp_data_frag * | |
1095 | mptcp_carve_data_frag(const struct mptcp_sock *msk, struct page_frag *pfrag, | |
1096 | int orig_offset) | |
1097 | { | |
1098 | int offset = ALIGN(orig_offset, sizeof(long)); | |
1099 | struct mptcp_data_frag *dfrag; | |
1100 | ||
1101 | dfrag = (struct mptcp_data_frag *)(page_to_virt(pfrag->page) + offset); | |
1102 | dfrag->data_len = 0; | |
1103 | dfrag->data_seq = msk->write_seq; | |
1104 | dfrag->overhead = offset - orig_offset + sizeof(struct mptcp_data_frag); | |
1105 | dfrag->offset = offset + sizeof(struct mptcp_data_frag); | |
d9ca1de8 | 1106 | dfrag->already_sent = 0; |
18b683bf PA |
1107 | dfrag->page = pfrag->page; |
1108 | ||
1109 | return dfrag; | |
1110 | } | |
1111 | ||
caf971df PA |
1112 | struct mptcp_sendmsg_info { |
1113 | int mss_now; | |
1114 | int size_goal; | |
d9ca1de8 PA |
1115 | u16 limit; |
1116 | u16 sent; | |
1117 | unsigned int flags; | |
caf971df PA |
1118 | }; |
1119 | ||
6f8a612a FW |
1120 | static int mptcp_check_allowed_size(struct mptcp_sock *msk, u64 data_seq, |
1121 | int avail_size) | |
1122 | { | |
1123 | u64 window_end = mptcp_wnd_end(msk); | |
1124 | ||
1125 | if (__mptcp_check_fallback(msk)) | |
1126 | return avail_size; | |
1127 | ||
1128 | if (!before64(data_seq + avail_size, window_end)) { | |
1129 | u64 allowed_size = window_end - data_seq; | |
1130 | ||
1131 | return min_t(unsigned int, allowed_size, avail_size); | |
1132 | } | |
1133 | ||
1134 | return avail_size; | |
1135 | } | |
1136 | ||
724cfd2e PA |
1137 | static bool __mptcp_add_ext(struct sk_buff *skb, gfp_t gfp) |
1138 | { | |
1139 | struct skb_ext *mpext = __skb_ext_alloc(gfp); | |
1140 | ||
1141 | if (!mpext) | |
1142 | return false; | |
1143 | __skb_ext_set(skb, SKB_EXT_MPTCP, mpext); | |
1144 | return true; | |
1145 | } | |
1146 | ||
6e628cd3 | 1147 | static struct sk_buff *__mptcp_do_alloc_tx_skb(struct sock *sk, gfp_t gfp) |
724cfd2e PA |
1148 | { |
1149 | struct sk_buff *skb; | |
1150 | ||
6e628cd3 | 1151 | skb = alloc_skb_fclone(MAX_TCP_HEADER, gfp); |
724cfd2e | 1152 | if (likely(skb)) { |
6e628cd3 | 1153 | if (likely(__mptcp_add_ext(skb, gfp))) { |
724cfd2e PA |
1154 | skb_reserve(skb, MAX_TCP_HEADER); |
1155 | skb->reserved_tailroom = skb->end - skb->tail; | |
1156 | return skb; | |
1157 | } | |
1158 | __kfree_skb(skb); | |
1159 | } else { | |
1160 | mptcp_enter_memory_pressure(sk); | |
1161 | } | |
1162 | return NULL; | |
1163 | } | |
1164 | ||
1165 | static bool mptcp_tx_cache_refill(struct sock *sk, int size, | |
1166 | struct sk_buff_head *skbs, int *total_ts) | |
1167 | { | |
1168 | struct mptcp_sock *msk = mptcp_sk(sk); | |
1169 | struct sk_buff *skb; | |
1170 | int space_needed; | |
1171 | ||
1172 | if (unlikely(tcp_under_memory_pressure(sk))) { | |
1173 | mptcp_mem_reclaim_partial(sk); | |
1174 | ||
1175 | /* under pressure pre-allocate at most a single skb */ | |
1176 | if (msk->skb_tx_cache.qlen) | |
1177 | return true; | |
1178 | space_needed = msk->size_goal_cache; | |
1179 | } else { | |
1180 | space_needed = msk->tx_pending_data + size - | |
1181 | msk->skb_tx_cache.qlen * msk->size_goal_cache; | |
1182 | } | |
1183 | ||
1184 | while (space_needed > 0) { | |
6e628cd3 | 1185 | skb = __mptcp_do_alloc_tx_skb(sk, sk->sk_allocation); |
724cfd2e PA |
1186 | if (unlikely(!skb)) { |
1187 | /* under memory pressure, try to pass the caller a | |
1188 | * single skb to allow forward progress | |
1189 | */ | |
1190 | while (skbs->qlen > 1) { | |
1191 | skb = __skb_dequeue_tail(skbs); | |
eaeef1ce | 1192 | *total_ts -= skb->truesize; |
724cfd2e PA |
1193 | __kfree_skb(skb); |
1194 | } | |
1195 | return skbs->qlen > 0; | |
1196 | } | |
1197 | ||
1198 | *total_ts += skb->truesize; | |
1199 | __skb_queue_tail(skbs, skb); | |
1200 | space_needed -= msk->size_goal_cache; | |
1201 | } | |
1202 | return true; | |
1203 | } | |
1204 | ||
6e628cd3 | 1205 | static bool __mptcp_alloc_tx_skb(struct sock *sk, struct sock *ssk, gfp_t gfp) |
724cfd2e PA |
1206 | { |
1207 | struct mptcp_sock *msk = mptcp_sk(sk); | |
1208 | struct sk_buff *skb; | |
1209 | ||
1210 | if (ssk->sk_tx_skb_cache) { | |
1211 | skb = ssk->sk_tx_skb_cache; | |
1212 | if (unlikely(!skb_ext_find(skb, SKB_EXT_MPTCP) && | |
6e628cd3 | 1213 | !__mptcp_add_ext(skb, gfp))) |
724cfd2e PA |
1214 | return false; |
1215 | return true; | |
1216 | } | |
1217 | ||
1218 | skb = skb_peek(&msk->skb_tx_cache); | |
1219 | if (skb) { | |
1220 | if (likely(sk_wmem_schedule(ssk, skb->truesize))) { | |
1221 | skb = __skb_dequeue(&msk->skb_tx_cache); | |
1222 | if (WARN_ON_ONCE(!skb)) | |
1223 | return false; | |
1224 | ||
1225 | mptcp_wmem_uncharge(sk, skb->truesize); | |
1226 | ssk->sk_tx_skb_cache = skb; | |
1227 | return true; | |
1228 | } | |
1229 | ||
1230 | /* over memory limit, no point to try to allocate a new skb */ | |
1231 | return false; | |
1232 | } | |
1233 | ||
6e628cd3 | 1234 | skb = __mptcp_do_alloc_tx_skb(sk, gfp); |
724cfd2e PA |
1235 | if (!skb) |
1236 | return false; | |
1237 | ||
1238 | if (likely(sk_wmem_schedule(ssk, skb->truesize))) { | |
1239 | ssk->sk_tx_skb_cache = skb; | |
1240 | return true; | |
1241 | } | |
1242 | kfree_skb(skb); | |
1243 | return false; | |
1244 | } | |
1245 | ||
1246 | static bool mptcp_must_reclaim_memory(struct sock *sk, struct sock *ssk) | |
1247 | { | |
1248 | return !ssk->sk_tx_skb_cache && | |
1249 | !skb_peek(&mptcp_sk(sk)->skb_tx_cache) && | |
1250 | tcp_under_memory_pressure(sk); | |
1251 | } | |
1252 | ||
1253 | static bool mptcp_alloc_tx_skb(struct sock *sk, struct sock *ssk) | |
1254 | { | |
1255 | if (unlikely(mptcp_must_reclaim_memory(sk, ssk))) | |
1256 | mptcp_mem_reclaim_partial(sk); | |
6e628cd3 | 1257 | return __mptcp_alloc_tx_skb(sk, ssk, sk->sk_allocation); |
724cfd2e PA |
1258 | } |
1259 | ||
6d0060f6 | 1260 | static int mptcp_sendmsg_frag(struct sock *sk, struct sock *ssk, |
d9ca1de8 | 1261 | struct mptcp_data_frag *dfrag, |
caf971df | 1262 | struct mptcp_sendmsg_info *info) |
6d0060f6 | 1263 | { |
d9ca1de8 | 1264 | u64 data_seq = dfrag->data_seq + info->sent; |
6d0060f6 | 1265 | struct mptcp_sock *msk = mptcp_sk(sk); |
6f8a612a | 1266 | bool zero_window_probe = false; |
6d0060f6 | 1267 | struct mptcp_ext *mpext = NULL; |
57040755 | 1268 | struct sk_buff *skb, *tail; |
d9ca1de8 | 1269 | bool can_collapse = false; |
15e6ca97 | 1270 | int size_bias = 0; |
d9ca1de8 | 1271 | int avail_size; |
724cfd2e | 1272 | size_t ret = 0; |
6d0060f6 | 1273 | |
d9ca1de8 PA |
1274 | pr_debug("msk=%p ssk=%p sending dfrag at seq=%lld len=%d already sent=%d", |
1275 | msk, ssk, dfrag->data_seq, dfrag->data_len, info->sent); | |
1276 | ||
1277 | /* compute send limit */ | |
1278 | info->mss_now = tcp_send_mss(ssk, &info->size_goal, info->flags); | |
caf971df | 1279 | avail_size = info->size_goal; |
724cfd2e | 1280 | msk->size_goal_cache = info->size_goal; |
57040755 PA |
1281 | skb = tcp_write_queue_tail(ssk); |
1282 | if (skb) { | |
57040755 PA |
1283 | /* Limit the write to the size available in the |
1284 | * current skb, if any, so that we create at most a new skb. | |
1285 | * Explicitly tells TCP internals to avoid collapsing on later | |
1286 | * queue management operation, to avoid breaking the ext <-> | |
1287 | * SSN association set here | |
1288 | */ | |
d9ca1de8 | 1289 | mpext = skb_ext_find(skb, SKB_EXT_MPTCP); |
caf971df | 1290 | can_collapse = (info->size_goal - skb->len > 0) && |
d9ca1de8 | 1291 | mptcp_skb_can_collapse_to(data_seq, skb, mpext); |
15e6ca97 | 1292 | if (!can_collapse) { |
57040755 | 1293 | TCP_SKB_CB(skb)->eor = 1; |
15e6ca97 PA |
1294 | } else { |
1295 | size_bias = skb->len; | |
caf971df | 1296 | avail_size = info->size_goal - skb->len; |
15e6ca97 | 1297 | } |
57040755 | 1298 | } |
18b683bf | 1299 | |
6f8a612a FW |
1300 | /* Zero window and all data acked? Probe. */ |
1301 | avail_size = mptcp_check_allowed_size(msk, data_seq, avail_size); | |
1302 | if (avail_size == 0) { | |
7439d687 PA |
1303 | u64 snd_una = READ_ONCE(msk->snd_una); |
1304 | ||
1305 | if (skb || snd_una != msk->snd_nxt) | |
6f8a612a FW |
1306 | return 0; |
1307 | zero_window_probe = true; | |
7439d687 | 1308 | data_seq = snd_una - 1; |
6f8a612a FW |
1309 | avail_size = 1; |
1310 | } | |
1311 | ||
d9ca1de8 PA |
1312 | if (WARN_ON_ONCE(info->sent > info->limit || |
1313 | info->limit > dfrag->data_len)) | |
1314 | return 0; | |
d027236c | 1315 | |
d9ca1de8 | 1316 | ret = info->limit - info->sent; |
15e6ca97 PA |
1317 | tail = tcp_build_frag(ssk, avail_size + size_bias, info->flags, |
1318 | dfrag->page, dfrag->offset + info->sent, &ret); | |
e2223995 PA |
1319 | if (!tail) { |
1320 | tcp_remove_empty_skb(sk, tcp_write_queue_tail(ssk)); | |
1321 | return -ENOMEM; | |
35759383 | 1322 | } |
18b683bf | 1323 | |
e2223995 | 1324 | /* if the tail skb is still the cached one, collapsing really happened. |
57040755 | 1325 | */ |
e2223995 | 1326 | if (skb == tail) { |
15e6ca97 | 1327 | TCP_SKB_CB(tail)->tcp_flags &= ~TCPHDR_PSH; |
57040755 | 1328 | mpext->data_len += ret; |
15e6ca97 | 1329 | WARN_ON_ONCE(!can_collapse); |
6f8a612a | 1330 | WARN_ON_ONCE(zero_window_probe); |
57040755 PA |
1331 | goto out; |
1332 | } | |
1333 | ||
724cfd2e PA |
1334 | mpext = skb_ext_find(tail, SKB_EXT_MPTCP); |
1335 | if (WARN_ON_ONCE(!mpext)) { | |
1336 | /* should never reach here, stream corrupted */ | |
1337 | return -EINVAL; | |
1338 | } | |
6d0060f6 MM |
1339 | |
1340 | memset(mpext, 0, sizeof(*mpext)); | |
d9ca1de8 | 1341 | mpext->data_seq = data_seq; |
6d0060f6 MM |
1342 | mpext->subflow_seq = mptcp_subflow_ctx(ssk)->rel_write_seq; |
1343 | mpext->data_len = ret; | |
1344 | mpext->use_map = 1; | |
1345 | mpext->dsn64 = 1; | |
1346 | ||
1347 | pr_debug("data_seq=%llu subflow_seq=%u data_len=%u dsn64=%d", | |
1348 | mpext->data_seq, mpext->subflow_seq, mpext->data_len, | |
1349 | mpext->dsn64); | |
1350 | ||
6f8a612a FW |
1351 | if (zero_window_probe) { |
1352 | mptcp_subflow_ctx(ssk)->rel_write_seq += ret; | |
1353 | mpext->frozen = 1; | |
1354 | ret = 0; | |
1355 | tcp_push_pending_frames(ssk); | |
1356 | } | |
57040755 | 1357 | out: |
6d0060f6 | 1358 | mptcp_subflow_ctx(ssk)->rel_write_seq += ret; |
6d0060f6 MM |
1359 | return ret; |
1360 | } | |
1361 | ||
d5f49190 PA |
1362 | #define MPTCP_SEND_BURST_SIZE ((1 << 16) - \ |
1363 | sizeof(struct tcphdr) - \ | |
1364 | MAX_TCP_OPTION_SPACE - \ | |
1365 | sizeof(struct ipv6hdr) - \ | |
1366 | sizeof(struct frag_hdr)) | |
1367 | ||
1368 | struct subflow_send_info { | |
1369 | struct sock *ssk; | |
1370 | u64 ratio; | |
1371 | }; | |
1372 | ||
5cf92bba | 1373 | static struct sock *mptcp_subflow_get_send(struct mptcp_sock *msk) |
f296234c | 1374 | { |
d5f49190 | 1375 | struct subflow_send_info send_info[2]; |
f296234c | 1376 | struct mptcp_subflow_context *subflow; |
d5f49190 PA |
1377 | int i, nr_active = 0; |
1378 | struct sock *ssk; | |
1379 | u64 ratio; | |
1380 | u32 pace; | |
f296234c | 1381 | |
d5f49190 | 1382 | sock_owned_by_me((struct sock *)msk); |
f296234c | 1383 | |
d5f49190 PA |
1384 | if (__mptcp_check_fallback(msk)) { |
1385 | if (!msk->first) | |
f296234c | 1386 | return NULL; |
d5f49190 PA |
1387 | return sk_stream_memory_free(msk->first) ? msk->first : NULL; |
1388 | } | |
1389 | ||
1390 | /* re-use last subflow, if the burst allow that */ | |
1391 | if (msk->last_snd && msk->snd_burst > 0 && | |
1392 | sk_stream_memory_free(msk->last_snd) && | |
5cf92bba | 1393 | mptcp_subflow_active(mptcp_subflow_ctx(msk->last_snd))) |
d5f49190 | 1394 | return msk->last_snd; |
f296234c | 1395 | |
d5f49190 PA |
1396 | /* pick the subflow with the lower wmem/wspace ratio */ |
1397 | for (i = 0; i < 2; ++i) { | |
1398 | send_info[i].ssk = NULL; | |
1399 | send_info[i].ratio = -1; | |
1400 | } | |
1401 | mptcp_for_each_subflow(msk, subflow) { | |
1402 | ssk = mptcp_subflow_tcp_sock(subflow); | |
1403 | if (!mptcp_subflow_active(subflow)) | |
1404 | continue; | |
1405 | ||
1406 | nr_active += !subflow->backup; | |
ec369c3a | 1407 | if (!sk_stream_memory_free(subflow->tcp_sock) || !tcp_sk(ssk)->snd_wnd) |
d5f49190 | 1408 | continue; |
f296234c | 1409 | |
d5f49190 PA |
1410 | pace = READ_ONCE(ssk->sk_pacing_rate); |
1411 | if (!pace) | |
f296234c | 1412 | continue; |
f296234c | 1413 | |
d5f49190 PA |
1414 | ratio = div_u64((u64)READ_ONCE(ssk->sk_wmem_queued) << 32, |
1415 | pace); | |
1416 | if (ratio < send_info[subflow->backup].ratio) { | |
1417 | send_info[subflow->backup].ssk = ssk; | |
1418 | send_info[subflow->backup].ratio = ratio; | |
1419 | } | |
f296234c PK |
1420 | } |
1421 | ||
d5f49190 PA |
1422 | pr_debug("msk=%p nr_active=%d ssk=%p:%lld backup=%p:%lld", |
1423 | msk, nr_active, send_info[0].ssk, send_info[0].ratio, | |
1424 | send_info[1].ssk, send_info[1].ratio); | |
1425 | ||
1426 | /* pick the best backup if no other subflow is active */ | |
1427 | if (!nr_active) | |
1428 | send_info[0].ssk = send_info[1].ssk; | |
1429 | ||
1430 | if (send_info[0].ssk) { | |
1431 | msk->last_snd = send_info[0].ssk; | |
1432 | msk->snd_burst = min_t(int, MPTCP_SEND_BURST_SIZE, | |
ec369c3a | 1433 | tcp_sk(msk->last_snd)->snd_wnd); |
d5f49190 PA |
1434 | return msk->last_snd; |
1435 | } | |
5cf92bba | 1436 | |
d5f49190 | 1437 | return NULL; |
f296234c PK |
1438 | } |
1439 | ||
d9ca1de8 PA |
1440 | static void mptcp_push_release(struct sock *sk, struct sock *ssk, |
1441 | struct mptcp_sendmsg_info *info) | |
1442 | { | |
1443 | mptcp_set_timeout(sk, ssk); | |
1444 | tcp_push(ssk, 0, info->mss_now, tcp_sk(ssk)->nonagle, info->size_goal); | |
1445 | release_sock(ssk); | |
1446 | } | |
1447 | ||
1448 | static void mptcp_push_pending(struct sock *sk, unsigned int flags) | |
f870fa0b | 1449 | { |
d9ca1de8 | 1450 | struct sock *prev_ssk = NULL, *ssk = NULL; |
f870fa0b | 1451 | struct mptcp_sock *msk = mptcp_sk(sk); |
caf971df | 1452 | struct mptcp_sendmsg_info info = { |
d9ca1de8 | 1453 | .flags = flags, |
caf971df | 1454 | }; |
d9ca1de8 PA |
1455 | struct mptcp_data_frag *dfrag; |
1456 | int len, copied = 0; | |
d9ca1de8 PA |
1457 | |
1458 | while ((dfrag = mptcp_send_head(sk))) { | |
1459 | info.sent = dfrag->already_sent; | |
1460 | info.limit = dfrag->data_len; | |
1461 | len = dfrag->data_len - dfrag->already_sent; | |
1462 | while (len > 0) { | |
1463 | int ret = 0; | |
1464 | ||
1465 | prev_ssk = ssk; | |
1466 | __mptcp_flush_join_list(msk); | |
5cf92bba | 1467 | ssk = mptcp_subflow_get_send(msk); |
d9ca1de8 PA |
1468 | |
1469 | /* try to keep the subflow socket lock across | |
1470 | * consecutive xmit on the same socket | |
1471 | */ | |
1472 | if (ssk != prev_ssk && prev_ssk) | |
1473 | mptcp_push_release(sk, prev_ssk, &info); | |
1474 | if (!ssk) | |
1475 | goto out; | |
1476 | ||
1477 | if (ssk != prev_ssk || !prev_ssk) | |
1478 | lock_sock(ssk); | |
1479 | ||
724cfd2e PA |
1480 | /* keep it simple and always provide a new skb for the |
1481 | * subflow, even if we will not use it when collapsing | |
1482 | * on the pending one | |
1483 | */ | |
1484 | if (!mptcp_alloc_tx_skb(sk, ssk)) { | |
1485 | mptcp_push_release(sk, ssk, &info); | |
1486 | goto out; | |
1487 | } | |
1488 | ||
d9ca1de8 PA |
1489 | ret = mptcp_sendmsg_frag(sk, ssk, dfrag, &info); |
1490 | if (ret <= 0) { | |
1491 | mptcp_push_release(sk, ssk, &info); | |
1492 | goto out; | |
1493 | } | |
1494 | ||
1495 | info.sent += ret; | |
1496 | dfrag->already_sent += ret; | |
1497 | msk->snd_nxt += ret; | |
1498 | msk->snd_burst -= ret; | |
724cfd2e | 1499 | msk->tx_pending_data -= ret; |
d9ca1de8 PA |
1500 | copied += ret; |
1501 | len -= ret; | |
1502 | } | |
1503 | WRITE_ONCE(msk->first_pending, mptcp_send_next(sk)); | |
1504 | } | |
1505 | ||
1506 | /* at this point we held the socket lock for the last subflow we used */ | |
1507 | if (ssk) | |
1508 | mptcp_push_release(sk, ssk, &info); | |
1509 | ||
1510 | out: | |
b680a214 PA |
1511 | if (copied) { |
1512 | /* start the timer, if it's not pending */ | |
1513 | if (!mptcp_timer_pending(sk)) | |
1514 | mptcp_reset_timer(sk); | |
d9ca1de8 | 1515 | __mptcp_check_send_data_fin(sk); |
b680a214 | 1516 | } |
d9ca1de8 PA |
1517 | } |
1518 | ||
6e628cd3 PA |
1519 | static void __mptcp_subflow_push_pending(struct sock *sk, struct sock *ssk) |
1520 | { | |
1521 | struct mptcp_sock *msk = mptcp_sk(sk); | |
1522 | struct mptcp_sendmsg_info info; | |
1523 | struct mptcp_data_frag *dfrag; | |
b19bc294 | 1524 | struct sock *xmit_ssk; |
6e628cd3 | 1525 | int len, copied = 0; |
b19bc294 | 1526 | bool first = true; |
6e628cd3 PA |
1527 | |
1528 | info.flags = 0; | |
1529 | while ((dfrag = mptcp_send_head(sk))) { | |
1530 | info.sent = dfrag->already_sent; | |
1531 | info.limit = dfrag->data_len; | |
1532 | len = dfrag->data_len - dfrag->already_sent; | |
1533 | while (len > 0) { | |
1534 | int ret = 0; | |
1535 | ||
b19bc294 PA |
1536 | /* the caller already invoked the packet scheduler, |
1537 | * check for a different subflow usage only after | |
1538 | * spooling the first chunk of data | |
1539 | */ | |
1540 | xmit_ssk = first ? ssk : mptcp_subflow_get_send(mptcp_sk(sk)); | |
1541 | if (!xmit_ssk) | |
1542 | goto out; | |
1543 | if (xmit_ssk != ssk) { | |
1544 | mptcp_subflow_delegate(mptcp_subflow_ctx(xmit_ssk)); | |
1545 | goto out; | |
1546 | } | |
1547 | ||
6e628cd3 PA |
1548 | if (unlikely(mptcp_must_reclaim_memory(sk, ssk))) { |
1549 | __mptcp_update_wmem(sk); | |
1550 | sk_mem_reclaim_partial(sk); | |
1551 | } | |
1552 | if (!__mptcp_alloc_tx_skb(sk, ssk, GFP_ATOMIC)) | |
1553 | goto out; | |
1554 | ||
1555 | ret = mptcp_sendmsg_frag(sk, ssk, dfrag, &info); | |
1556 | if (ret <= 0) | |
1557 | goto out; | |
1558 | ||
1559 | info.sent += ret; | |
1560 | dfrag->already_sent += ret; | |
1561 | msk->snd_nxt += ret; | |
1562 | msk->snd_burst -= ret; | |
1563 | msk->tx_pending_data -= ret; | |
1564 | copied += ret; | |
1565 | len -= ret; | |
b19bc294 | 1566 | first = false; |
6e628cd3 PA |
1567 | } |
1568 | WRITE_ONCE(msk->first_pending, mptcp_send_next(sk)); | |
1569 | } | |
1570 | ||
1571 | out: | |
1572 | /* __mptcp_alloc_tx_skb could have released some wmem and we are | |
1573 | * not going to flush it via release_sock() | |
1574 | */ | |
1575 | __mptcp_update_wmem(sk); | |
1576 | if (copied) { | |
1577 | mptcp_set_timeout(sk, ssk); | |
1578 | tcp_push(ssk, 0, info.mss_now, tcp_sk(ssk)->nonagle, | |
1579 | info.size_goal); | |
d09d818e PA |
1580 | if (!mptcp_timer_pending(sk)) |
1581 | mptcp_reset_timer(sk); | |
1582 | ||
6e628cd3 PA |
1583 | if (msk->snd_data_fin_enable && |
1584 | msk->snd_nxt + 1 == msk->write_seq) | |
1585 | mptcp_schedule_work(sk); | |
1586 | } | |
1587 | } | |
1588 | ||
5cf92bba PA |
1589 | static void mptcp_set_nospace(struct sock *sk) |
1590 | { | |
1591 | /* enable autotune */ | |
1592 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
1593 | ||
1594 | /* will be cleared on avail space */ | |
1595 | set_bit(MPTCP_NOSPACE, &mptcp_sk(sk)->flags); | |
1596 | } | |
1597 | ||
d9ca1de8 PA |
1598 | static int mptcp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) |
1599 | { | |
1600 | struct mptcp_sock *msk = mptcp_sk(sk); | |
17091708 | 1601 | struct page_frag *pfrag; |
6d0060f6 | 1602 | size_t copied = 0; |
caf971df | 1603 | int ret = 0; |
6d0060f6 | 1604 | long timeo; |
f870fa0b MM |
1605 | |
1606 | if (msg->msg_flags & ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL)) | |
1607 | return -EOPNOTSUPP; | |
1608 | ||
e7579d5d | 1609 | mptcp_lock_sock(sk, __mptcp_wmem_reserve(sk, min_t(size_t, 1 << 20, len))); |
1954b860 MM |
1610 | |
1611 | timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); | |
1612 | ||
1613 | if ((1 << sk->sk_state) & ~(TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)) { | |
1614 | ret = sk_stream_wait_connect(sk, &timeo); | |
1615 | if (ret) | |
1616 | goto out; | |
1617 | } | |
1618 | ||
17091708 | 1619 | pfrag = sk_page_frag(sk); |
18b683bf | 1620 | |
d9ca1de8 | 1621 | while (msg_data_left(msg)) { |
724cfd2e | 1622 | int total_ts, frag_truesize = 0; |
d9ca1de8 | 1623 | struct mptcp_data_frag *dfrag; |
724cfd2e | 1624 | struct sk_buff_head skbs; |
d9ca1de8 PA |
1625 | bool dfrag_collapsed; |
1626 | size_t psize, offset; | |
18b683bf | 1627 | |
d9ca1de8 PA |
1628 | if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN)) { |
1629 | ret = -EPIPE; | |
f296234c PK |
1630 | goto out; |
1631 | } | |
da51aef5 | 1632 | |
d9ca1de8 PA |
1633 | /* reuse tail pfrag, if possible, or carve a new one from the |
1634 | * page allocator | |
1635 | */ | |
1636 | dfrag = mptcp_pending_tail(sk); | |
1637 | dfrag_collapsed = mptcp_frag_can_collapse_to(msk, pfrag, dfrag); | |
1638 | if (!dfrag_collapsed) { | |
6e628cd3 PA |
1639 | if (!sk_stream_memory_free(sk)) |
1640 | goto wait_for_memory; | |
1641 | ||
d9ca1de8 PA |
1642 | if (!mptcp_page_frag_refill(sk, pfrag)) |
1643 | goto wait_for_memory; | |
1644 | ||
1645 | dfrag = mptcp_carve_data_frag(msk, pfrag, pfrag->offset); | |
1646 | frag_truesize = dfrag->overhead; | |
72511aab | 1647 | } |
6d0060f6 | 1648 | |
d9ca1de8 PA |
1649 | /* we do not bound vs wspace, to allow a single packet. |
1650 | * memory accounting will prevent execessive memory usage | |
1651 | * anyway | |
d5f49190 | 1652 | */ |
d9ca1de8 PA |
1653 | offset = dfrag->offset + dfrag->data_len; |
1654 | psize = pfrag->size - offset; | |
1655 | psize = min_t(size_t, psize, msg_data_left(msg)); | |
724cfd2e PA |
1656 | total_ts = psize + frag_truesize; |
1657 | __skb_queue_head_init(&skbs); | |
1658 | if (!mptcp_tx_cache_refill(sk, psize, &skbs, &total_ts)) | |
d9ca1de8 PA |
1659 | goto wait_for_memory; |
1660 | ||
724cfd2e PA |
1661 | if (!mptcp_wmem_alloc(sk, total_ts)) { |
1662 | __skb_queue_purge(&skbs); | |
1663 | goto wait_for_memory; | |
1664 | } | |
1665 | ||
1666 | skb_queue_splice_tail(&skbs, &msk->skb_tx_cache); | |
d9ca1de8 PA |
1667 | if (copy_page_from_iter(dfrag->page, offset, psize, |
1668 | &msg->msg_iter) != psize) { | |
87952603 | 1669 | mptcp_wmem_uncharge(sk, psize + frag_truesize); |
d9ca1de8 PA |
1670 | ret = -EFAULT; |
1671 | goto out; | |
72511aab FW |
1672 | } |
1673 | ||
d9ca1de8 PA |
1674 | /* data successfully copied into the write queue */ |
1675 | copied += psize; | |
1676 | dfrag->data_len += psize; | |
1677 | frag_truesize += psize; | |
1678 | pfrag->offset += frag_truesize; | |
1679 | WRITE_ONCE(msk->write_seq, msk->write_seq + psize); | |
13e16037 | 1680 | msk->tx_pending_data += psize; |
d9ca1de8 PA |
1681 | |
1682 | /* charge data on mptcp pending queue to the msk socket | |
1683 | * Note: we charge such data both to sk and ssk | |
fb529e62 | 1684 | */ |
d9ca1de8 | 1685 | sk_wmem_queued_add(sk, frag_truesize); |
d9ca1de8 PA |
1686 | if (!dfrag_collapsed) { |
1687 | get_page(dfrag->page); | |
1688 | list_add_tail(&dfrag->list, &msk->rtx_queue); | |
1689 | if (!msk->first_pending) | |
1690 | WRITE_ONCE(msk->first_pending, dfrag); | |
fb529e62 | 1691 | } |
d9ca1de8 PA |
1692 | pr_debug("msk=%p dfrag at seq=%lld len=%d sent=%d new=%d", msk, |
1693 | dfrag->data_seq, dfrag->data_len, dfrag->already_sent, | |
1694 | !dfrag_collapsed); | |
6d0060f6 | 1695 | |
d9ca1de8 | 1696 | continue; |
b51f9b80 | 1697 | |
d9ca1de8 | 1698 | wait_for_memory: |
5cf92bba | 1699 | mptcp_set_nospace(sk); |
6e628cd3 | 1700 | mptcp_push_pending(sk, msg->msg_flags); |
d9ca1de8 PA |
1701 | ret = sk_stream_wait_memory(sk, &timeo); |
1702 | if (ret) | |
1703 | goto out; | |
57040755 | 1704 | } |
6d0060f6 | 1705 | |
13e16037 | 1706 | if (copied) |
d9ca1de8 PA |
1707 | mptcp_push_pending(sk, msg->msg_flags); |
1708 | ||
1954b860 | 1709 | out: |
cec37a6e | 1710 | release_sock(sk); |
8555c6bf | 1711 | return copied ? : ret; |
f870fa0b MM |
1712 | } |
1713 | ||
7a6a6cbc PA |
1714 | static void mptcp_wait_data(struct sock *sk, long *timeo) |
1715 | { | |
1716 | DEFINE_WAIT_FUNC(wait, woken_wake_function); | |
1717 | struct mptcp_sock *msk = mptcp_sk(sk); | |
1718 | ||
1719 | add_wait_queue(sk_sleep(sk), &wait); | |
1720 | sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk); | |
1721 | ||
1722 | sk_wait_event(sk, timeo, | |
1723 | test_and_clear_bit(MPTCP_DATA_READY, &msk->flags), &wait); | |
1724 | ||
1725 | sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk); | |
1726 | remove_wait_queue(sk_sleep(sk), &wait); | |
1727 | } | |
1728 | ||
6771bfd9 FW |
1729 | static int __mptcp_recvmsg_mskq(struct mptcp_sock *msk, |
1730 | struct msghdr *msg, | |
1731 | size_t len) | |
1732 | { | |
6771bfd9 FW |
1733 | struct sk_buff *skb; |
1734 | int copied = 0; | |
1735 | ||
87952603 | 1736 | while ((skb = skb_peek(&msk->receive_queue)) != NULL) { |
6771bfd9 FW |
1737 | u32 offset = MPTCP_SKB_CB(skb)->offset; |
1738 | u32 data_len = skb->len - offset; | |
1739 | u32 count = min_t(size_t, len - copied, data_len); | |
1740 | int err; | |
1741 | ||
1742 | err = skb_copy_datagram_msg(skb, offset, msg, count); | |
1743 | if (unlikely(err < 0)) { | |
1744 | if (!copied) | |
1745 | return err; | |
1746 | break; | |
1747 | } | |
1748 | ||
1749 | copied += count; | |
1750 | ||
1751 | if (count < data_len) { | |
1752 | MPTCP_SKB_CB(skb)->offset += count; | |
1753 | break; | |
1754 | } | |
1755 | ||
87952603 PA |
1756 | /* we will bulk release the skb memory later */ |
1757 | skb->destructor = NULL; | |
1758 | msk->rmem_released += skb->truesize; | |
1759 | __skb_unlink(skb, &msk->receive_queue); | |
6771bfd9 FW |
1760 | __kfree_skb(skb); |
1761 | ||
1762 | if (copied >= len) | |
1763 | break; | |
1764 | } | |
1765 | ||
1766 | return copied; | |
1767 | } | |
1768 | ||
a6b118fe FW |
1769 | /* receive buffer autotuning. See tcp_rcv_space_adjust for more information. |
1770 | * | |
1771 | * Only difference: Use highest rtt estimate of the subflows in use. | |
1772 | */ | |
1773 | static void mptcp_rcv_space_adjust(struct mptcp_sock *msk, int copied) | |
1774 | { | |
1775 | struct mptcp_subflow_context *subflow; | |
1776 | struct sock *sk = (struct sock *)msk; | |
1777 | u32 time, advmss = 1; | |
1778 | u64 rtt_us, mstamp; | |
1779 | ||
1780 | sock_owned_by_me(sk); | |
1781 | ||
1782 | if (copied <= 0) | |
1783 | return; | |
1784 | ||
1785 | msk->rcvq_space.copied += copied; | |
1786 | ||
1787 | mstamp = div_u64(tcp_clock_ns(), NSEC_PER_USEC); | |
1788 | time = tcp_stamp_us_delta(mstamp, msk->rcvq_space.time); | |
1789 | ||
1790 | rtt_us = msk->rcvq_space.rtt_us; | |
1791 | if (rtt_us && time < (rtt_us >> 3)) | |
1792 | return; | |
1793 | ||
1794 | rtt_us = 0; | |
1795 | mptcp_for_each_subflow(msk, subflow) { | |
1796 | const struct tcp_sock *tp; | |
1797 | u64 sf_rtt_us; | |
1798 | u32 sf_advmss; | |
1799 | ||
1800 | tp = tcp_sk(mptcp_subflow_tcp_sock(subflow)); | |
1801 | ||
1802 | sf_rtt_us = READ_ONCE(tp->rcv_rtt_est.rtt_us); | |
1803 | sf_advmss = READ_ONCE(tp->advmss); | |
1804 | ||
1805 | rtt_us = max(sf_rtt_us, rtt_us); | |
1806 | advmss = max(sf_advmss, advmss); | |
1807 | } | |
1808 | ||
1809 | msk->rcvq_space.rtt_us = rtt_us; | |
1810 | if (time < (rtt_us >> 3) || rtt_us == 0) | |
1811 | return; | |
1812 | ||
1813 | if (msk->rcvq_space.copied <= msk->rcvq_space.space) | |
1814 | goto new_measure; | |
1815 | ||
1816 | if (sock_net(sk)->ipv4.sysctl_tcp_moderate_rcvbuf && | |
1817 | !(sk->sk_userlocks & SOCK_RCVBUF_LOCK)) { | |
1818 | int rcvmem, rcvbuf; | |
1819 | u64 rcvwin, grow; | |
1820 | ||
1821 | rcvwin = ((u64)msk->rcvq_space.copied << 1) + 16 * advmss; | |
1822 | ||
1823 | grow = rcvwin * (msk->rcvq_space.copied - msk->rcvq_space.space); | |
1824 | ||
1825 | do_div(grow, msk->rcvq_space.space); | |
1826 | rcvwin += (grow << 1); | |
1827 | ||
1828 | rcvmem = SKB_TRUESIZE(advmss + MAX_TCP_HEADER); | |
1829 | while (tcp_win_from_space(sk, rcvmem) < advmss) | |
1830 | rcvmem += 128; | |
1831 | ||
1832 | do_div(rcvwin, advmss); | |
1833 | rcvbuf = min_t(u64, rcvwin * rcvmem, | |
1834 | sock_net(sk)->ipv4.sysctl_tcp_rmem[2]); | |
1835 | ||
1836 | if (rcvbuf > sk->sk_rcvbuf) { | |
1837 | u32 window_clamp; | |
1838 | ||
1839 | window_clamp = tcp_win_from_space(sk, rcvbuf); | |
1840 | WRITE_ONCE(sk->sk_rcvbuf, rcvbuf); | |
1841 | ||
1842 | /* Make subflows follow along. If we do not do this, we | |
1843 | * get drops at subflow level if skbs can't be moved to | |
1844 | * the mptcp rx queue fast enough (announced rcv_win can | |
1845 | * exceed ssk->sk_rcvbuf). | |
1846 | */ | |
1847 | mptcp_for_each_subflow(msk, subflow) { | |
1848 | struct sock *ssk; | |
c76c6956 | 1849 | bool slow; |
a6b118fe FW |
1850 | |
1851 | ssk = mptcp_subflow_tcp_sock(subflow); | |
c76c6956 | 1852 | slow = lock_sock_fast(ssk); |
a6b118fe FW |
1853 | WRITE_ONCE(ssk->sk_rcvbuf, rcvbuf); |
1854 | tcp_sk(ssk)->window_clamp = window_clamp; | |
c76c6956 PA |
1855 | tcp_cleanup_rbuf(ssk, 1); |
1856 | unlock_sock_fast(ssk, slow); | |
a6b118fe FW |
1857 | } |
1858 | } | |
1859 | } | |
1860 | ||
1861 | msk->rcvq_space.space = msk->rcvq_space.copied; | |
1862 | new_measure: | |
1863 | msk->rcvq_space.copied = 0; | |
1864 | msk->rcvq_space.time = mstamp; | |
1865 | } | |
1866 | ||
87952603 PA |
1867 | static void __mptcp_update_rmem(struct sock *sk) |
1868 | { | |
1869 | struct mptcp_sock *msk = mptcp_sk(sk); | |
1870 | ||
1871 | if (!msk->rmem_released) | |
1872 | return; | |
1873 | ||
1874 | atomic_sub(msk->rmem_released, &sk->sk_rmem_alloc); | |
1875 | sk_mem_uncharge(sk, msk->rmem_released); | |
1876 | msk->rmem_released = 0; | |
1877 | } | |
1878 | ||
1879 | static void __mptcp_splice_receive_queue(struct sock *sk) | |
1880 | { | |
1881 | struct mptcp_sock *msk = mptcp_sk(sk); | |
1882 | ||
1883 | skb_queue_splice_tail_init(&sk->sk_receive_queue, &msk->receive_queue); | |
1884 | } | |
1885 | ||
e3859603 | 1886 | static bool __mptcp_move_skbs(struct mptcp_sock *msk) |
6771bfd9 | 1887 | { |
87952603 | 1888 | struct sock *sk = (struct sock *)msk; |
6771bfd9 | 1889 | unsigned int moved = 0; |
87952603 | 1890 | bool ret, done; |
d5f49190 PA |
1891 | |
1892 | __mptcp_flush_join_list(msk); | |
6771bfd9 FW |
1893 | do { |
1894 | struct sock *ssk = mptcp_subflow_recv_lookup(msk); | |
65f49fe7 | 1895 | bool slowpath; |
6771bfd9 | 1896 | |
87952603 PA |
1897 | /* we can have data pending in the subflows only if the msk |
1898 | * receive buffer was full at subflow_data_ready() time, | |
1899 | * that is an unlikely slow path. | |
1900 | */ | |
1901 | if (likely(!ssk)) | |
6771bfd9 FW |
1902 | break; |
1903 | ||
65f49fe7 | 1904 | slowpath = lock_sock_fast(ssk); |
87952603 | 1905 | mptcp_data_lock(sk); |
e3859603 | 1906 | __mptcp_update_rmem(sk); |
6771bfd9 | 1907 | done = __mptcp_move_skbs_from_subflow(msk, ssk, &moved); |
87952603 | 1908 | mptcp_data_unlock(sk); |
e3859603 | 1909 | tcp_cleanup_rbuf(ssk, moved); |
65f49fe7 | 1910 | unlock_sock_fast(ssk, slowpath); |
6771bfd9 FW |
1911 | } while (!done); |
1912 | ||
87952603 PA |
1913 | /* acquire the data lock only if some input data is pending */ |
1914 | ret = moved > 0; | |
1915 | if (!RB_EMPTY_ROOT(&msk->out_of_order_queue) || | |
1916 | !skb_queue_empty_lockless(&sk->sk_receive_queue)) { | |
1917 | mptcp_data_lock(sk); | |
1918 | __mptcp_update_rmem(sk); | |
1919 | ret |= __mptcp_ofo_queue(msk); | |
1920 | __mptcp_splice_receive_queue(sk); | |
1921 | mptcp_data_unlock(sk); | |
e3859603 | 1922 | mptcp_cleanup_rbuf(msk); |
ab174ad8 | 1923 | } |
87952603 PA |
1924 | if (ret) |
1925 | mptcp_check_data_fin((struct sock *)msk); | |
1926 | return !skb_queue_empty(&msk->receive_queue); | |
6771bfd9 FW |
1927 | } |
1928 | ||
f870fa0b MM |
1929 | static int mptcp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, |
1930 | int nonblock, int flags, int *addr_len) | |
1931 | { | |
1932 | struct mptcp_sock *msk = mptcp_sk(sk); | |
cec37a6e | 1933 | int copied = 0; |
7a6a6cbc PA |
1934 | int target; |
1935 | long timeo; | |
f870fa0b MM |
1936 | |
1937 | if (msg->msg_flags & ~(MSG_WAITALL | MSG_DONTWAIT)) | |
1938 | return -EOPNOTSUPP; | |
1939 | ||
87952603 | 1940 | mptcp_lock_sock(sk, __mptcp_splice_receive_queue(sk)); |
fd897679 PA |
1941 | if (unlikely(sk->sk_state == TCP_LISTEN)) { |
1942 | copied = -ENOTCONN; | |
1943 | goto out_err; | |
1944 | } | |
1945 | ||
7a6a6cbc PA |
1946 | timeo = sock_rcvtimeo(sk, nonblock); |
1947 | ||
1948 | len = min_t(size_t, len, INT_MAX); | |
1949 | target = sock_rcvlowat(sk, flags & MSG_WAITALL, len); | |
1950 | ||
05e3ecea | 1951 | while (copied < len) { |
e3859603 | 1952 | int bytes_read; |
7a6a6cbc | 1953 | |
6771bfd9 FW |
1954 | bytes_read = __mptcp_recvmsg_mskq(msk, msg, len - copied); |
1955 | if (unlikely(bytes_read < 0)) { | |
1956 | if (!copied) | |
1957 | copied = bytes_read; | |
1958 | goto out_err; | |
1959 | } | |
7a6a6cbc | 1960 | |
6771bfd9 | 1961 | copied += bytes_read; |
7a6a6cbc | 1962 | |
ea4ca586 | 1963 | /* be sure to advertise window change */ |
e3859603 PA |
1964 | mptcp_cleanup_rbuf(msk); |
1965 | ||
1966 | if (skb_queue_empty(&msk->receive_queue) && __mptcp_move_skbs(msk)) | |
1967 | continue; | |
ea4ca586 | 1968 | |
7a6a6cbc PA |
1969 | /* only the master socket status is relevant here. The exit |
1970 | * conditions mirror closely tcp_recvmsg() | |
1971 | */ | |
1972 | if (copied >= target) | |
1973 | break; | |
1974 | ||
1975 | if (copied) { | |
1976 | if (sk->sk_err || | |
1977 | sk->sk_state == TCP_CLOSE || | |
1978 | (sk->sk_shutdown & RCV_SHUTDOWN) || | |
1979 | !timeo || | |
1980 | signal_pending(current)) | |
1981 | break; | |
1982 | } else { | |
1983 | if (sk->sk_err) { | |
1984 | copied = sock_error(sk); | |
1985 | break; | |
1986 | } | |
1987 | ||
5969856a PA |
1988 | if (test_and_clear_bit(MPTCP_WORK_EOF, &msk->flags)) |
1989 | mptcp_check_for_eof(msk); | |
1990 | ||
87952603 PA |
1991 | if (sk->sk_shutdown & RCV_SHUTDOWN) { |
1992 | /* race breaker: the shutdown could be after the | |
1993 | * previous receive queue check | |
1994 | */ | |
e3859603 | 1995 | if (__mptcp_move_skbs(msk)) |
87952603 | 1996 | continue; |
7a6a6cbc | 1997 | break; |
87952603 | 1998 | } |
7a6a6cbc PA |
1999 | |
2000 | if (sk->sk_state == TCP_CLOSE) { | |
2001 | copied = -ENOTCONN; | |
2002 | break; | |
2003 | } | |
2004 | ||
2005 | if (!timeo) { | |
2006 | copied = -EAGAIN; | |
2007 | break; | |
2008 | } | |
2009 | ||
2010 | if (signal_pending(current)) { | |
2011 | copied = sock_intr_errno(timeo); | |
2012 | break; | |
2013 | } | |
2014 | } | |
2015 | ||
2016 | pr_debug("block timeout %ld", timeo); | |
7a6a6cbc | 2017 | mptcp_wait_data(sk, &timeo); |
cec37a6e PK |
2018 | } |
2019 | ||
87952603 PA |
2020 | if (skb_queue_empty_lockless(&sk->sk_receive_queue) && |
2021 | skb_queue_empty(&msk->receive_queue)) { | |
6771bfd9 | 2022 | /* entire backlog drained, clear DATA_READY. */ |
7a6a6cbc | 2023 | clear_bit(MPTCP_DATA_READY, &msk->flags); |
cec37a6e | 2024 | |
6771bfd9 FW |
2025 | /* .. race-breaker: ssk might have gotten new data |
2026 | * after last __mptcp_move_skbs() returned false. | |
7a6a6cbc | 2027 | */ |
e3859603 | 2028 | if (unlikely(__mptcp_move_skbs(msk))) |
7a6a6cbc | 2029 | set_bit(MPTCP_DATA_READY, &msk->flags); |
6771bfd9 FW |
2030 | } else if (unlikely(!test_bit(MPTCP_DATA_READY, &msk->flags))) { |
2031 | /* data to read but mptcp_wait_data() cleared DATA_READY */ | |
2032 | set_bit(MPTCP_DATA_READY, &msk->flags); | |
7a6a6cbc | 2033 | } |
6771bfd9 | 2034 | out_err: |
6719331c PA |
2035 | pr_debug("msk=%p data_ready=%d rx queue empty=%d copied=%d", |
2036 | msk, test_bit(MPTCP_DATA_READY, &msk->flags), | |
87952603 | 2037 | skb_queue_empty_lockless(&sk->sk_receive_queue), copied); |
a6b118fe FW |
2038 | mptcp_rcv_space_adjust(msk, copied); |
2039 | ||
7a6a6cbc | 2040 | release_sock(sk); |
cec37a6e PK |
2041 | return copied; |
2042 | } | |
2043 | ||
b51f9b80 PA |
2044 | static void mptcp_retransmit_handler(struct sock *sk) |
2045 | { | |
2046 | struct mptcp_sock *msk = mptcp_sk(sk); | |
2047 | ||
7439d687 PA |
2048 | set_bit(MPTCP_WORK_RTX, &msk->flags); |
2049 | mptcp_schedule_work(sk); | |
b51f9b80 PA |
2050 | } |
2051 | ||
2052 | static void mptcp_retransmit_timer(struct timer_list *t) | |
2053 | { | |
2054 | struct inet_connection_sock *icsk = from_timer(icsk, t, | |
2055 | icsk_retransmit_timer); | |
2056 | struct sock *sk = &icsk->icsk_inet.sk; | |
2057 | ||
2058 | bh_lock_sock(sk); | |
2059 | if (!sock_owned_by_user(sk)) { | |
2060 | mptcp_retransmit_handler(sk); | |
2061 | } else { | |
2062 | /* delegate our work to tcp_release_cb() */ | |
2063 | if (!test_and_set_bit(TCP_WRITE_TIMER_DEFERRED, | |
2064 | &sk->sk_tsq_flags)) | |
2065 | sock_hold(sk); | |
2066 | } | |
2067 | bh_unlock_sock(sk); | |
2068 | sock_put(sk); | |
2069 | } | |
2070 | ||
e16163b6 PA |
2071 | static void mptcp_timeout_timer(struct timer_list *t) |
2072 | { | |
2073 | struct sock *sk = from_timer(sk, t, sk_timer); | |
2074 | ||
2075 | mptcp_schedule_work(sk); | |
b6d69fc8 | 2076 | sock_put(sk); |
e16163b6 PA |
2077 | } |
2078 | ||
3b1d6210 PA |
2079 | /* Find an idle subflow. Return NULL if there is unacked data at tcp |
2080 | * level. | |
2081 | * | |
2082 | * A backup subflow is returned only if that is the only kind available. | |
2083 | */ | |
2084 | static struct sock *mptcp_subflow_get_retrans(const struct mptcp_sock *msk) | |
2085 | { | |
2086 | struct mptcp_subflow_context *subflow; | |
2087 | struct sock *backup = NULL; | |
2088 | ||
2089 | sock_owned_by_me((const struct sock *)msk); | |
2090 | ||
d5f49190 | 2091 | if (__mptcp_check_fallback(msk)) |
d9ca1de8 | 2092 | return NULL; |
d5f49190 | 2093 | |
3b1d6210 PA |
2094 | mptcp_for_each_subflow(msk, subflow) { |
2095 | struct sock *ssk = mptcp_subflow_tcp_sock(subflow); | |
2096 | ||
d5f49190 PA |
2097 | if (!mptcp_subflow_active(subflow)) |
2098 | continue; | |
2099 | ||
3b1d6210 | 2100 | /* still data outstanding at TCP level? Don't retransmit. */ |
860975c6 FW |
2101 | if (!tcp_write_queue_empty(ssk)) { |
2102 | if (inet_csk(ssk)->icsk_ca_state >= TCP_CA_Loss) | |
2103 | continue; | |
3b1d6210 | 2104 | return NULL; |
860975c6 | 2105 | } |
3b1d6210 PA |
2106 | |
2107 | if (subflow->backup) { | |
2108 | if (!backup) | |
2109 | backup = ssk; | |
2110 | continue; | |
2111 | } | |
2112 | ||
2113 | return ssk; | |
2114 | } | |
2115 | ||
2116 | return backup; | |
2117 | } | |
2118 | ||
cec37a6e PK |
2119 | /* subflow sockets can be either outgoing (connect) or incoming |
2120 | * (accept). | |
2121 | * | |
2122 | * Outgoing subflows use in-kernel sockets. | |
2123 | * Incoming subflows do not have their own 'struct socket' allocated, | |
2124 | * so we need to use tcp_close() after detaching them from the mptcp | |
2125 | * parent socket. | |
2126 | */ | |
a141e02e FW |
2127 | static void __mptcp_close_ssk(struct sock *sk, struct sock *ssk, |
2128 | struct mptcp_subflow_context *subflow) | |
cec37a6e | 2129 | { |
e0be4931 FW |
2130 | struct mptcp_sock *msk = mptcp_sk(sk); |
2131 | ||
cec37a6e PK |
2132 | list_del(&subflow->node); |
2133 | ||
3f8b2667 | 2134 | lock_sock_nested(ssk, SINGLE_DEPTH_NESTING); |
e16163b6 PA |
2135 | |
2136 | /* if we are invoked by the msk cleanup code, the subflow is | |
2137 | * already orphaned | |
2138 | */ | |
866f26f2 | 2139 | if (ssk->sk_socket) |
e16163b6 | 2140 | sock_orphan(ssk); |
e16163b6 | 2141 | |
d7b1bfd0 PA |
2142 | subflow->disposable = 1; |
2143 | ||
e16163b6 PA |
2144 | /* if ssk hit tcp_done(), tcp_cleanup_ulp() cleared the related ops |
2145 | * the ssk has been already destroyed, we just need to release the | |
2146 | * reference owned by msk; | |
2147 | */ | |
2148 | if (!inet_csk(ssk)->icsk_ulp_ops) { | |
2149 | kfree_rcu(subflow, rcu); | |
cec37a6e | 2150 | } else { |
d7b1bfd0 | 2151 | /* otherwise tcp will dispose of the ssk and subflow ctx */ |
e16163b6 PA |
2152 | __tcp_close(ssk, 0); |
2153 | ||
2154 | /* close acquired an extra ref */ | |
2155 | __sock_put(ssk); | |
cec37a6e | 2156 | } |
e16163b6 | 2157 | release_sock(ssk); |
e16163b6 PA |
2158 | |
2159 | sock_put(ssk); | |
e0be4931 FW |
2160 | |
2161 | if (ssk == msk->last_snd) | |
2162 | msk->last_snd = NULL; | |
f870fa0b MM |
2163 | } |
2164 | ||
a141e02e FW |
2165 | void mptcp_close_ssk(struct sock *sk, struct sock *ssk, |
2166 | struct mptcp_subflow_context *subflow) | |
2167 | { | |
b911c97c FW |
2168 | if (sk->sk_state == TCP_ESTABLISHED) |
2169 | mptcp_event(MPTCP_EVENT_SUB_CLOSED, mptcp_sk(sk), ssk, GFP_KERNEL); | |
a141e02e FW |
2170 | __mptcp_close_ssk(sk, ssk, subflow); |
2171 | } | |
2172 | ||
dc24f8b4 PA |
2173 | static unsigned int mptcp_sync_mss(struct sock *sk, u32 pmtu) |
2174 | { | |
2175 | return 0; | |
2176 | } | |
2177 | ||
0e4f35d7 PA |
2178 | static void __mptcp_close_subflow(struct mptcp_sock *msk) |
2179 | { | |
2180 | struct mptcp_subflow_context *subflow, *tmp; | |
2181 | ||
3abc05d9 FW |
2182 | might_sleep(); |
2183 | ||
0e4f35d7 PA |
2184 | list_for_each_entry_safe(subflow, tmp, &msk->conn_list, node) { |
2185 | struct sock *ssk = mptcp_subflow_tcp_sock(subflow); | |
2186 | ||
2187 | if (inet_sk_state_load(ssk) != TCP_CLOSE) | |
2188 | continue; | |
2189 | ||
40947e13 FW |
2190 | /* 'subflow_data_ready' will re-sched once rx queue is empty */ |
2191 | if (!skb_queue_empty_lockless(&ssk->sk_receive_queue)) | |
2192 | continue; | |
2193 | ||
a141e02e | 2194 | mptcp_close_ssk((struct sock *)msk, ssk, subflow); |
0e4f35d7 PA |
2195 | } |
2196 | } | |
2197 | ||
e16163b6 PA |
2198 | static bool mptcp_check_close_timeout(const struct sock *sk) |
2199 | { | |
2200 | s32 delta = tcp_jiffies32 - inet_csk(sk)->icsk_mtup.probe_timestamp; | |
2201 | struct mptcp_subflow_context *subflow; | |
2202 | ||
2203 | if (delta >= TCP_TIMEWAIT_LEN) | |
2204 | return true; | |
2205 | ||
2206 | /* if all subflows are in closed status don't bother with additional | |
2207 | * timeout | |
2208 | */ | |
2209 | mptcp_for_each_subflow(mptcp_sk(sk), subflow) { | |
2210 | if (inet_sk_state_load(mptcp_subflow_tcp_sock(subflow)) != | |
2211 | TCP_CLOSE) | |
2212 | return false; | |
2213 | } | |
2214 | return true; | |
2215 | } | |
2216 | ||
50c504a2 FW |
2217 | static void mptcp_check_fastclose(struct mptcp_sock *msk) |
2218 | { | |
2219 | struct mptcp_subflow_context *subflow, *tmp; | |
2220 | struct sock *sk = &msk->sk.icsk_inet.sk; | |
2221 | ||
2222 | if (likely(!READ_ONCE(msk->rcv_fastclose))) | |
2223 | return; | |
2224 | ||
2225 | mptcp_token_destroy(msk); | |
2226 | ||
2227 | list_for_each_entry_safe(subflow, tmp, &msk->conn_list, node) { | |
2228 | struct sock *tcp_sk = mptcp_subflow_tcp_sock(subflow); | |
2229 | ||
2230 | lock_sock(tcp_sk); | |
2231 | if (tcp_sk->sk_state != TCP_CLOSE) { | |
2232 | tcp_send_active_reset(tcp_sk, GFP_ATOMIC); | |
2233 | tcp_set_state(tcp_sk, TCP_CLOSE); | |
2234 | } | |
2235 | release_sock(tcp_sk); | |
2236 | } | |
2237 | ||
2238 | inet_sk_state_store(sk, TCP_CLOSE); | |
2239 | sk->sk_shutdown = SHUTDOWN_MASK; | |
2240 | smp_mb__before_atomic(); /* SHUTDOWN must be visible first */ | |
2241 | set_bit(MPTCP_DATA_READY, &msk->flags); | |
2242 | set_bit(MPTCP_WORK_CLOSE_SUBFLOW, &msk->flags); | |
2243 | ||
2244 | mptcp_close_wake_up(sk); | |
2245 | } | |
2246 | ||
80992017 PA |
2247 | static void mptcp_worker(struct work_struct *work) |
2248 | { | |
2249 | struct mptcp_sock *msk = container_of(work, struct mptcp_sock, work); | |
3b1d6210 | 2250 | struct sock *ssk, *sk = &msk->sk.icsk_inet.sk; |
caf971df | 2251 | struct mptcp_sendmsg_info info = {}; |
3b1d6210 | 2252 | struct mptcp_data_frag *dfrag; |
3b1d6210 | 2253 | size_t copied = 0; |
e16163b6 | 2254 | int state, ret; |
80992017 PA |
2255 | |
2256 | lock_sock(sk); | |
e16163b6 PA |
2257 | state = sk->sk_state; |
2258 | if (unlikely(state == TCP_CLOSE)) | |
2259 | goto unlock; | |
2260 | ||
43b54c6e | 2261 | mptcp_check_data_fin_ack(sk); |
ec3edaa7 | 2262 | __mptcp_flush_join_list(msk); |
50c504a2 FW |
2263 | |
2264 | mptcp_check_fastclose(msk); | |
2265 | ||
b416268b | 2266 | if (msk->pm.status) |
e9801430 | 2267 | mptcp_pm_nl_work(msk); |
b416268b | 2268 | |
59832e24 FW |
2269 | if (test_and_clear_bit(MPTCP_WORK_EOF, &msk->flags)) |
2270 | mptcp_check_for_eof(msk); | |
2271 | ||
6e628cd3 | 2272 | __mptcp_check_send_data_fin(sk); |
43b54c6e MM |
2273 | mptcp_check_data_fin(sk); |
2274 | ||
341c6524 PA |
2275 | /* There is no point in keeping around an orphaned sk timedout or |
2276 | * closed, but we need the msk around to reply to incoming DATA_FIN, | |
2277 | * even if it is orphaned and in FIN_WAIT2 state | |
e16163b6 PA |
2278 | */ |
2279 | if (sock_flag(sk, SOCK_DEAD) && | |
341c6524 | 2280 | (mptcp_check_close_timeout(sk) || sk->sk_state == TCP_CLOSE)) { |
e16163b6 PA |
2281 | inet_sk_state_store(sk, TCP_CLOSE); |
2282 | __mptcp_destroy_sock(sk); | |
2283 | goto unlock; | |
2284 | } | |
2285 | ||
b263b0d7 FW |
2286 | if (test_and_clear_bit(MPTCP_WORK_CLOSE_SUBFLOW, &msk->flags)) |
2287 | __mptcp_close_subflow(msk); | |
2288 | ||
3b1d6210 PA |
2289 | if (!test_and_clear_bit(MPTCP_WORK_RTX, &msk->flags)) |
2290 | goto unlock; | |
2291 | ||
64b9cea7 | 2292 | __mptcp_clean_una(sk); |
3b1d6210 PA |
2293 | dfrag = mptcp_rtx_head(sk); |
2294 | if (!dfrag) | |
2295 | goto unlock; | |
2296 | ||
2297 | ssk = mptcp_subflow_get_retrans(msk); | |
2298 | if (!ssk) | |
2299 | goto reset_unlock; | |
2300 | ||
2301 | lock_sock(ssk); | |
2302 | ||
d9ca1de8 PA |
2303 | /* limit retransmission to the bytes already sent on some subflows */ |
2304 | info.sent = 0; | |
2305 | info.limit = dfrag->already_sent; | |
2306 | while (info.sent < dfrag->already_sent) { | |
724cfd2e PA |
2307 | if (!mptcp_alloc_tx_skb(sk, ssk)) |
2308 | break; | |
2309 | ||
d9ca1de8 | 2310 | ret = mptcp_sendmsg_frag(sk, ssk, dfrag, &info); |
6f8a612a | 2311 | if (ret <= 0) |
3b1d6210 PA |
2312 | break; |
2313 | ||
fc518953 | 2314 | MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_RETRANSSEGS); |
3b1d6210 | 2315 | copied += ret; |
d9ca1de8 | 2316 | info.sent += ret; |
3b1d6210 PA |
2317 | } |
2318 | if (copied) | |
caf971df PA |
2319 | tcp_push(ssk, 0, info.mss_now, tcp_sk(ssk)->nonagle, |
2320 | info.size_goal); | |
3b1d6210 | 2321 | |
3b1d6210 PA |
2322 | mptcp_set_timeout(sk, ssk); |
2323 | release_sock(ssk); | |
2324 | ||
2325 | reset_unlock: | |
2326 | if (!mptcp_timer_pending(sk)) | |
2327 | mptcp_reset_timer(sk); | |
2328 | ||
2329 | unlock: | |
80992017 PA |
2330 | release_sock(sk); |
2331 | sock_put(sk); | |
2332 | } | |
2333 | ||
784325e9 | 2334 | static int __mptcp_init_sock(struct sock *sk) |
f870fa0b | 2335 | { |
cec37a6e PK |
2336 | struct mptcp_sock *msk = mptcp_sk(sk); |
2337 | ||
ec3edaa7 PK |
2338 | spin_lock_init(&msk->join_list_lock); |
2339 | ||
cec37a6e | 2340 | INIT_LIST_HEAD(&msk->conn_list); |
ec3edaa7 | 2341 | INIT_LIST_HEAD(&msk->join_list); |
18b683bf | 2342 | INIT_LIST_HEAD(&msk->rtx_queue); |
80992017 | 2343 | INIT_WORK(&msk->work, mptcp_worker); |
87952603 | 2344 | __skb_queue_head_init(&msk->receive_queue); |
724cfd2e | 2345 | __skb_queue_head_init(&msk->skb_tx_cache); |
ab174ad8 | 2346 | msk->out_of_order_queue = RB_ROOT; |
f0e6a4cf | 2347 | msk->first_pending = NULL; |
e93da928 | 2348 | msk->wmem_reserved = 0; |
87952603 | 2349 | msk->rmem_released = 0; |
724cfd2e PA |
2350 | msk->tx_pending_data = 0; |
2351 | msk->size_goal_cache = TCP_BASE_MSS; | |
cec37a6e | 2352 | |
ea4ca586 | 2353 | msk->ack_hint = NULL; |
8ab183de | 2354 | msk->first = NULL; |
dc24f8b4 | 2355 | inet_csk(sk)->icsk_sync_mss = mptcp_sync_mss; |
8ab183de | 2356 | |
1b1c7a0e PK |
2357 | mptcp_pm_data_init(msk); |
2358 | ||
b51f9b80 PA |
2359 | /* re-use the csk retrans timer for MPTCP-level retrans */ |
2360 | timer_setup(&msk->sk.icsk_retransmit_timer, mptcp_retransmit_timer, 0); | |
e16163b6 | 2361 | timer_setup(&sk->sk_timer, mptcp_timeout_timer, 0); |
f870fa0b MM |
2362 | return 0; |
2363 | } | |
2364 | ||
784325e9 MB |
2365 | static int mptcp_init_sock(struct sock *sk) |
2366 | { | |
fc518953 FW |
2367 | struct net *net = sock_net(sk); |
2368 | int ret; | |
18b683bf | 2369 | |
b6c08380 GT |
2370 | ret = __mptcp_init_sock(sk); |
2371 | if (ret) | |
2372 | return ret; | |
2373 | ||
fc518953 FW |
2374 | if (!mptcp_is_enabled(net)) |
2375 | return -ENOPROTOOPT; | |
2376 | ||
2377 | if (unlikely(!net->mib.mptcp_statistics) && !mptcp_mib_alloc(net)) | |
2378 | return -ENOMEM; | |
2379 | ||
fa68018d PA |
2380 | ret = __mptcp_socket_create(mptcp_sk(sk)); |
2381 | if (ret) | |
2382 | return ret; | |
2383 | ||
d027236c | 2384 | sk_sockets_allocated_inc(sk); |
a6b118fe | 2385 | sk->sk_rcvbuf = sock_net(sk)->ipv4.sysctl_tcp_rmem[1]; |
da51aef5 | 2386 | sk->sk_sndbuf = sock_net(sk)->ipv4.sysctl_tcp_wmem[1]; |
d027236c | 2387 | |
18b683bf PA |
2388 | return 0; |
2389 | } | |
2390 | ||
2391 | static void __mptcp_clear_xmit(struct sock *sk) | |
2392 | { | |
2393 | struct mptcp_sock *msk = mptcp_sk(sk); | |
2394 | struct mptcp_data_frag *dtmp, *dfrag; | |
724cfd2e | 2395 | struct sk_buff *skb; |
18b683bf | 2396 | |
d9ca1de8 | 2397 | WRITE_ONCE(msk->first_pending, NULL); |
18b683bf | 2398 | list_for_each_entry_safe(dfrag, dtmp, &msk->rtx_queue, list) |
d027236c | 2399 | dfrag_clear(sk, dfrag); |
724cfd2e PA |
2400 | while ((skb = __skb_dequeue(&msk->skb_tx_cache)) != NULL) { |
2401 | sk->sk_forward_alloc += skb->truesize; | |
2402 | kfree_skb(skb); | |
2403 | } | |
784325e9 MB |
2404 | } |
2405 | ||
80992017 PA |
2406 | static void mptcp_cancel_work(struct sock *sk) |
2407 | { | |
2408 | struct mptcp_sock *msk = mptcp_sk(sk); | |
2409 | ||
b2771d24 | 2410 | if (cancel_work_sync(&msk->work)) |
e16163b6 | 2411 | __sock_put(sk); |
80992017 PA |
2412 | } |
2413 | ||
d0876b22 | 2414 | void mptcp_subflow_shutdown(struct sock *sk, struct sock *ssk, int how) |
21498490 PK |
2415 | { |
2416 | lock_sock(ssk); | |
2417 | ||
2418 | switch (ssk->sk_state) { | |
2419 | case TCP_LISTEN: | |
2420 | if (!(how & RCV_SHUTDOWN)) | |
2421 | break; | |
df561f66 | 2422 | fallthrough; |
21498490 PK |
2423 | case TCP_SYN_SENT: |
2424 | tcp_disconnect(ssk, O_NONBLOCK); | |
2425 | break; | |
2426 | default: | |
43b54c6e MM |
2427 | if (__mptcp_check_fallback(mptcp_sk(sk))) { |
2428 | pr_debug("Fallback"); | |
2429 | ssk->sk_shutdown |= how; | |
2430 | tcp_shutdown(ssk, how); | |
2431 | } else { | |
2432 | pr_debug("Sending DATA_FIN on subflow %p", ssk); | |
2433 | mptcp_set_timeout(sk, ssk); | |
2434 | tcp_send_ack(ssk); | |
2435 | } | |
21498490 PK |
2436 | break; |
2437 | } | |
2438 | ||
21498490 PK |
2439 | release_sock(ssk); |
2440 | } | |
2441 | ||
6920b851 MM |
2442 | static const unsigned char new_state[16] = { |
2443 | /* current state: new state: action: */ | |
2444 | [0 /* (Invalid) */] = TCP_CLOSE, | |
2445 | [TCP_ESTABLISHED] = TCP_FIN_WAIT1 | TCP_ACTION_FIN, | |
2446 | [TCP_SYN_SENT] = TCP_CLOSE, | |
2447 | [TCP_SYN_RECV] = TCP_FIN_WAIT1 | TCP_ACTION_FIN, | |
2448 | [TCP_FIN_WAIT1] = TCP_FIN_WAIT1, | |
2449 | [TCP_FIN_WAIT2] = TCP_FIN_WAIT2, | |
2450 | [TCP_TIME_WAIT] = TCP_CLOSE, /* should not happen ! */ | |
2451 | [TCP_CLOSE] = TCP_CLOSE, | |
2452 | [TCP_CLOSE_WAIT] = TCP_LAST_ACK | TCP_ACTION_FIN, | |
2453 | [TCP_LAST_ACK] = TCP_LAST_ACK, | |
2454 | [TCP_LISTEN] = TCP_CLOSE, | |
2455 | [TCP_CLOSING] = TCP_CLOSING, | |
2456 | [TCP_NEW_SYN_RECV] = TCP_CLOSE, /* should not happen ! */ | |
2457 | }; | |
2458 | ||
2459 | static int mptcp_close_state(struct sock *sk) | |
2460 | { | |
2461 | int next = (int)new_state[sk->sk_state]; | |
2462 | int ns = next & TCP_STATE_MASK; | |
2463 | ||
2464 | inet_sk_state_store(sk, ns); | |
2465 | ||
2466 | return next & TCP_ACTION_FIN; | |
2467 | } | |
2468 | ||
e16163b6 | 2469 | static void __mptcp_check_send_data_fin(struct sock *sk) |
f870fa0b | 2470 | { |
e16163b6 | 2471 | struct mptcp_subflow_context *subflow; |
f870fa0b MM |
2472 | struct mptcp_sock *msk = mptcp_sk(sk); |
2473 | ||
e16163b6 PA |
2474 | pr_debug("msk=%p snd_data_fin_enable=%d pending=%d snd_nxt=%llu write_seq=%llu", |
2475 | msk, msk->snd_data_fin_enable, !!mptcp_send_head(sk), | |
2476 | msk->snd_nxt, msk->write_seq); | |
43b54c6e | 2477 | |
e16163b6 PA |
2478 | /* we still need to enqueue subflows or not really shutting down, |
2479 | * skip this | |
2480 | */ | |
2481 | if (!msk->snd_data_fin_enable || msk->snd_nxt + 1 != msk->write_seq || | |
2482 | mptcp_send_head(sk)) | |
2483 | return; | |
2484 | ||
2485 | WRITE_ONCE(msk->snd_nxt, msk->write_seq); | |
2486 | ||
26aa2314 PA |
2487 | /* fallback socket will not get data_fin/ack, can move to the next |
2488 | * state now | |
2489 | */ | |
2490 | if (__mptcp_check_fallback(msk)) { | |
2491 | if ((1 << sk->sk_state) & (TCPF_CLOSING | TCPF_LAST_ACK)) { | |
2492 | inet_sk_state_store(sk, TCP_CLOSE); | |
2493 | mptcp_close_wake_up(sk); | |
2494 | } else if (sk->sk_state == TCP_FIN_WAIT1) { | |
2495 | inet_sk_state_store(sk, TCP_FIN_WAIT2); | |
2496 | } | |
43b54c6e MM |
2497 | } |
2498 | ||
e16163b6 PA |
2499 | __mptcp_flush_join_list(msk); |
2500 | mptcp_for_each_subflow(msk, subflow) { | |
2501 | struct sock *tcp_sk = mptcp_subflow_tcp_sock(subflow); | |
43b54c6e | 2502 | |
e16163b6 | 2503 | mptcp_subflow_shutdown(sk, tcp_sk, SEND_SHUTDOWN); |
43b54c6e | 2504 | } |
e16163b6 | 2505 | } |
2c22c06c | 2506 | |
e16163b6 PA |
2507 | static void __mptcp_wr_shutdown(struct sock *sk) |
2508 | { | |
2509 | struct mptcp_sock *msk = mptcp_sk(sk); | |
43b54c6e | 2510 | |
e16163b6 PA |
2511 | pr_debug("msk=%p snd_data_fin_enable=%d shutdown=%x state=%d pending=%d", |
2512 | msk, msk->snd_data_fin_enable, sk->sk_shutdown, sk->sk_state, | |
2513 | !!mptcp_send_head(sk)); | |
2514 | ||
2515 | /* will be ignored by fallback sockets */ | |
2516 | WRITE_ONCE(msk->write_seq, msk->write_seq + 1); | |
2517 | WRITE_ONCE(msk->snd_data_fin_enable, 1); | |
2518 | ||
2519 | __mptcp_check_send_data_fin(sk); | |
2520 | } | |
2521 | ||
2522 | static void __mptcp_destroy_sock(struct sock *sk) | |
2523 | { | |
2524 | struct mptcp_subflow_context *subflow, *tmp; | |
2525 | struct mptcp_sock *msk = mptcp_sk(sk); | |
2526 | LIST_HEAD(conn_list); | |
2527 | ||
2528 | pr_debug("msk=%p", msk); | |
f870fa0b | 2529 | |
3abc05d9 FW |
2530 | might_sleep(); |
2531 | ||
866f26f2 PA |
2532 | /* dispose the ancillatory tcp socket, if any */ |
2533 | if (msk->subflow) { | |
2534 | iput(SOCK_INODE(msk->subflow)); | |
2535 | msk->subflow = NULL; | |
2536 | } | |
2537 | ||
10f6d46c PA |
2538 | /* be sure to always acquire the join list lock, to sync vs |
2539 | * mptcp_finish_join(). | |
2540 | */ | |
2541 | spin_lock_bh(&msk->join_list_lock); | |
2542 | list_splice_tail_init(&msk->join_list, &msk->conn_list); | |
2543 | spin_unlock_bh(&msk->join_list_lock); | |
b2c5b614 FW |
2544 | list_splice_init(&msk->conn_list, &conn_list); |
2545 | ||
6e628cd3 | 2546 | sk_stop_timer(sk, &msk->sk.icsk_retransmit_timer); |
e16163b6 PA |
2547 | sk_stop_timer(sk, &sk->sk_timer); |
2548 | msk->pm.status = 0; | |
b2c5b614 FW |
2549 | |
2550 | list_for_each_entry_safe(subflow, tmp, &conn_list, node) { | |
cec37a6e | 2551 | struct sock *ssk = mptcp_subflow_tcp_sock(subflow); |
e16163b6 | 2552 | __mptcp_close_ssk(sk, ssk, subflow); |
f870fa0b MM |
2553 | } |
2554 | ||
e16163b6 | 2555 | sk->sk_prot->destroy(sk); |
80992017 | 2556 | |
e93da928 | 2557 | WARN_ON_ONCE(msk->wmem_reserved); |
87952603 | 2558 | WARN_ON_ONCE(msk->rmem_released); |
e16163b6 PA |
2559 | sk_stream_kill_queues(sk); |
2560 | xfrm_sk_free_policy(sk); | |
2561 | sk_refcnt_debug_release(sk); | |
2562 | sock_put(sk); | |
2563 | } | |
2564 | ||
2565 | static void mptcp_close(struct sock *sk, long timeout) | |
2566 | { | |
2567 | struct mptcp_subflow_context *subflow; | |
2568 | bool do_cancel_work = false; | |
2569 | ||
2570 | lock_sock(sk); | |
2571 | sk->sk_shutdown = SHUTDOWN_MASK; | |
2572 | ||
2573 | if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) { | |
2574 | inet_sk_state_store(sk, TCP_CLOSE); | |
2575 | goto cleanup; | |
2576 | } | |
6771bfd9 | 2577 | |
e16163b6 PA |
2578 | if (mptcp_close_state(sk)) |
2579 | __mptcp_wr_shutdown(sk); | |
2580 | ||
2581 | sk_stream_wait_close(sk, timeout); | |
2582 | ||
2583 | cleanup: | |
2584 | /* orphan all the subflows */ | |
2585 | inet_csk(sk)->icsk_mtup.probe_timestamp = tcp_jiffies32; | |
2586 | list_for_each_entry(subflow, &mptcp_sk(sk)->conn_list, node) { | |
2587 | struct sock *ssk = mptcp_subflow_tcp_sock(subflow); | |
866f26f2 | 2588 | bool slow = lock_sock_fast(ssk); |
e16163b6 | 2589 | |
e16163b6 PA |
2590 | sock_orphan(ssk); |
2591 | unlock_sock_fast(ssk, slow); | |
e16163b6 PA |
2592 | } |
2593 | sock_orphan(sk); | |
2594 | ||
2595 | sock_hold(sk); | |
2596 | pr_debug("msk=%p state=%d", sk, sk->sk_state); | |
2597 | if (sk->sk_state == TCP_CLOSE) { | |
2598 | __mptcp_destroy_sock(sk); | |
2599 | do_cancel_work = true; | |
2600 | } else { | |
2601 | sk_reset_timer(sk, &sk->sk_timer, jiffies + TCP_TIMEWAIT_LEN); | |
2602 | } | |
2603 | release_sock(sk); | |
2604 | if (do_cancel_work) | |
2605 | mptcp_cancel_work(sk); | |
b911c97c FW |
2606 | |
2607 | if (mptcp_sk(sk)->token) | |
2608 | mptcp_event(MPTCP_EVENT_CLOSED, mptcp_sk(sk), NULL, GFP_KERNEL); | |
2609 | ||
e16163b6 | 2610 | sock_put(sk); |
f870fa0b MM |
2611 | } |
2612 | ||
cf7da0d6 PK |
2613 | static void mptcp_copy_inaddrs(struct sock *msk, const struct sock *ssk) |
2614 | { | |
2615 | #if IS_ENABLED(CONFIG_MPTCP_IPV6) | |
2616 | const struct ipv6_pinfo *ssk6 = inet6_sk(ssk); | |
2617 | struct ipv6_pinfo *msk6 = inet6_sk(msk); | |
2618 | ||
2619 | msk->sk_v6_daddr = ssk->sk_v6_daddr; | |
2620 | msk->sk_v6_rcv_saddr = ssk->sk_v6_rcv_saddr; | |
2621 | ||
2622 | if (msk6 && ssk6) { | |
2623 | msk6->saddr = ssk6->saddr; | |
2624 | msk6->flow_label = ssk6->flow_label; | |
2625 | } | |
2626 | #endif | |
2627 | ||
2628 | inet_sk(msk)->inet_num = inet_sk(ssk)->inet_num; | |
2629 | inet_sk(msk)->inet_dport = inet_sk(ssk)->inet_dport; | |
2630 | inet_sk(msk)->inet_sport = inet_sk(ssk)->inet_sport; | |
2631 | inet_sk(msk)->inet_daddr = inet_sk(ssk)->inet_daddr; | |
2632 | inet_sk(msk)->inet_saddr = inet_sk(ssk)->inet_saddr; | |
2633 | inet_sk(msk)->inet_rcv_saddr = inet_sk(ssk)->inet_rcv_saddr; | |
2634 | } | |
2635 | ||
18b683bf PA |
2636 | static int mptcp_disconnect(struct sock *sk, int flags) |
2637 | { | |
76e2a55d PA |
2638 | struct mptcp_subflow_context *subflow; |
2639 | struct mptcp_sock *msk = mptcp_sk(sk); | |
2640 | ||
2641 | __mptcp_flush_join_list(msk); | |
13a9499e PA |
2642 | mptcp_for_each_subflow(msk, subflow) { |
2643 | struct sock *ssk = mptcp_subflow_tcp_sock(subflow); | |
2644 | ||
2645 | lock_sock(ssk); | |
2646 | tcp_disconnect(ssk, flags); | |
2647 | release_sock(ssk); | |
2648 | } | |
42c556fe | 2649 | return 0; |
18b683bf PA |
2650 | } |
2651 | ||
b0519de8 FW |
2652 | #if IS_ENABLED(CONFIG_MPTCP_IPV6) |
2653 | static struct ipv6_pinfo *mptcp_inet6_sk(const struct sock *sk) | |
2654 | { | |
2655 | unsigned int offset = sizeof(struct mptcp6_sock) - sizeof(struct ipv6_pinfo); | |
2656 | ||
2657 | return (struct ipv6_pinfo *)(((u8 *)sk) + offset); | |
2658 | } | |
2659 | #endif | |
2660 | ||
fca5c82c | 2661 | struct sock *mptcp_sk_clone(const struct sock *sk, |
cfde141e | 2662 | const struct mptcp_options_received *mp_opt, |
fca5c82c | 2663 | struct request_sock *req) |
b0519de8 | 2664 | { |
58b09919 | 2665 | struct mptcp_subflow_request_sock *subflow_req = mptcp_subflow_rsk(req); |
b0519de8 | 2666 | struct sock *nsk = sk_clone_lock(sk, GFP_ATOMIC); |
58b09919 PA |
2667 | struct mptcp_sock *msk; |
2668 | u64 ack_seq; | |
b0519de8 FW |
2669 | |
2670 | if (!nsk) | |
2671 | return NULL; | |
2672 | ||
2673 | #if IS_ENABLED(CONFIG_MPTCP_IPV6) | |
2674 | if (nsk->sk_family == AF_INET6) | |
2675 | inet_sk(nsk)->pinet6 = mptcp_inet6_sk(nsk); | |
2676 | #endif | |
2677 | ||
58b09919 PA |
2678 | __mptcp_init_sock(nsk); |
2679 | ||
2680 | msk = mptcp_sk(nsk); | |
2681 | msk->local_key = subflow_req->local_key; | |
2682 | msk->token = subflow_req->token; | |
2683 | msk->subflow = NULL; | |
b93df08c | 2684 | WRITE_ONCE(msk->fully_established, false); |
58b09919 | 2685 | |
58b09919 | 2686 | msk->write_seq = subflow_req->idsn + 1; |
eaa2ffab | 2687 | msk->snd_nxt = msk->write_seq; |
7439d687 PA |
2688 | msk->snd_una = msk->write_seq; |
2689 | msk->wnd_end = msk->snd_nxt + req->rsk_rcv_wnd; | |
6f8a612a | 2690 | |
cfde141e | 2691 | if (mp_opt->mp_capable) { |
58b09919 | 2692 | msk->can_ack = true; |
cfde141e | 2693 | msk->remote_key = mp_opt->sndr_key; |
58b09919 PA |
2694 | mptcp_crypto_key_sha(msk->remote_key, NULL, &ack_seq); |
2695 | ack_seq++; | |
917944da | 2696 | WRITE_ONCE(msk->ack_seq, ack_seq); |
fa3fe2b1 | 2697 | WRITE_ONCE(msk->rcv_wnd_sent, ack_seq); |
58b09919 | 2698 | } |
7f20d5fc | 2699 | |
5e20087d | 2700 | sock_reset_flag(nsk, SOCK_RCU_FREE); |
7f20d5fc PA |
2701 | /* will be fully established after successful MPC subflow creation */ |
2702 | inet_sk_state_store(nsk, TCP_SYN_RECV); | |
0c148460 PA |
2703 | |
2704 | security_inet_csk_clone(nsk, req); | |
58b09919 PA |
2705 | bh_unlock_sock(nsk); |
2706 | ||
2707 | /* keep a single reference */ | |
2708 | __sock_put(nsk); | |
b0519de8 FW |
2709 | return nsk; |
2710 | } | |
2711 | ||
a6b118fe FW |
2712 | void mptcp_rcv_space_init(struct mptcp_sock *msk, const struct sock *ssk) |
2713 | { | |
2714 | const struct tcp_sock *tp = tcp_sk(ssk); | |
2715 | ||
2716 | msk->rcvq_space.copied = 0; | |
2717 | msk->rcvq_space.rtt_us = 0; | |
2718 | ||
2719 | msk->rcvq_space.time = tp->tcp_mstamp; | |
2720 | ||
2721 | /* initial rcv_space offering made to peer */ | |
2722 | msk->rcvq_space.space = min_t(u32, tp->rcv_wnd, | |
2723 | TCP_INIT_CWND * tp->advmss); | |
2724 | if (msk->rcvq_space.space == 0) | |
2725 | msk->rcvq_space.space = TCP_INIT_CWND * TCP_MSS_DEFAULT; | |
6f8a612a | 2726 | |
7439d687 | 2727 | WRITE_ONCE(msk->wnd_end, msk->snd_nxt + tcp_sk(ssk)->snd_wnd); |
a6b118fe FW |
2728 | } |
2729 | ||
cf7da0d6 PK |
2730 | static struct sock *mptcp_accept(struct sock *sk, int flags, int *err, |
2731 | bool kern) | |
2732 | { | |
2733 | struct mptcp_sock *msk = mptcp_sk(sk); | |
2734 | struct socket *listener; | |
2735 | struct sock *newsk; | |
2736 | ||
2737 | listener = __mptcp_nmpc_socket(msk); | |
2738 | if (WARN_ON_ONCE(!listener)) { | |
2739 | *err = -EINVAL; | |
2740 | return NULL; | |
2741 | } | |
2742 | ||
2743 | pr_debug("msk=%p, listener=%p", msk, mptcp_subflow_ctx(listener->sk)); | |
2744 | newsk = inet_csk_accept(listener->sk, flags, err, kern); | |
2745 | if (!newsk) | |
2746 | return NULL; | |
2747 | ||
2748 | pr_debug("msk=%p, subflow is mptcp=%d", msk, sk_is_mptcp(newsk)); | |
cf7da0d6 PK |
2749 | if (sk_is_mptcp(newsk)) { |
2750 | struct mptcp_subflow_context *subflow; | |
2751 | struct sock *new_mptcp_sock; | |
cf7da0d6 PK |
2752 | |
2753 | subflow = mptcp_subflow_ctx(newsk); | |
58b09919 | 2754 | new_mptcp_sock = subflow->conn; |
cf7da0d6 | 2755 | |
58b09919 PA |
2756 | /* is_mptcp should be false if subflow->conn is missing, see |
2757 | * subflow_syn_recv_sock() | |
2758 | */ | |
2759 | if (WARN_ON_ONCE(!new_mptcp_sock)) { | |
2760 | tcp_sk(newsk)->is_mptcp = 0; | |
2761 | return newsk; | |
cf7da0d6 PK |
2762 | } |
2763 | ||
58b09919 PA |
2764 | /* acquire the 2nd reference for the owning socket */ |
2765 | sock_hold(new_mptcp_sock); | |
cf7da0d6 | 2766 | newsk = new_mptcp_sock; |
0397c6d8 | 2767 | MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_MPCAPABLEPASSIVEACK); |
fc518953 FW |
2768 | } else { |
2769 | MPTCP_INC_STATS(sock_net(sk), | |
2770 | MPTCP_MIB_MPCAPABLEPASSIVEFALLBACK); | |
cf7da0d6 PK |
2771 | } |
2772 | ||
2773 | return newsk; | |
2774 | } | |
2775 | ||
5c8c1640 GT |
2776 | void mptcp_destroy_common(struct mptcp_sock *msk) |
2777 | { | |
87952603 PA |
2778 | struct sock *sk = (struct sock *)msk; |
2779 | ||
6e628cd3 PA |
2780 | __mptcp_clear_xmit(sk); |
2781 | ||
87952603 PA |
2782 | /* move to sk_receive_queue, sk_stream_kill_queues will purge it */ |
2783 | skb_queue_splice_tail_init(&msk->receive_queue, &sk->sk_receive_queue); | |
2784 | ||
5c8c1640 GT |
2785 | skb_rbtree_purge(&msk->out_of_order_queue); |
2786 | mptcp_token_destroy(msk); | |
2787 | mptcp_pm_free_anno_list(msk); | |
2788 | } | |
2789 | ||
79c0949e PK |
2790 | static void mptcp_destroy(struct sock *sk) |
2791 | { | |
c9fd9c5f FW |
2792 | struct mptcp_sock *msk = mptcp_sk(sk); |
2793 | ||
5c8c1640 | 2794 | mptcp_destroy_common(msk); |
d027236c | 2795 | sk_sockets_allocated_dec(sk); |
79c0949e PK |
2796 | } |
2797 | ||
fd1452d8 | 2798 | static int mptcp_setsockopt_sol_socket(struct mptcp_sock *msk, int optname, |
a7b75c5a | 2799 | sockptr_t optval, unsigned int optlen) |
fd1452d8 FW |
2800 | { |
2801 | struct sock *sk = (struct sock *)msk; | |
2802 | struct socket *ssock; | |
2803 | int ret; | |
2804 | ||
2805 | switch (optname) { | |
2806 | case SO_REUSEPORT: | |
2807 | case SO_REUSEADDR: | |
2808 | lock_sock(sk); | |
2809 | ssock = __mptcp_nmpc_socket(msk); | |
2810 | if (!ssock) { | |
2811 | release_sock(sk); | |
2812 | return -EINVAL; | |
2813 | } | |
2814 | ||
a7b75c5a | 2815 | ret = sock_setsockopt(ssock, SOL_SOCKET, optname, optval, optlen); |
fd1452d8 FW |
2816 | if (ret == 0) { |
2817 | if (optname == SO_REUSEPORT) | |
2818 | sk->sk_reuseport = ssock->sk->sk_reuseport; | |
2819 | else if (optname == SO_REUSEADDR) | |
2820 | sk->sk_reuse = ssock->sk->sk_reuse; | |
2821 | } | |
2822 | release_sock(sk); | |
2823 | return ret; | |
2824 | } | |
2825 | ||
a7b75c5a | 2826 | return sock_setsockopt(sk->sk_socket, SOL_SOCKET, optname, optval, optlen); |
fd1452d8 FW |
2827 | } |
2828 | ||
c9b95a13 | 2829 | static int mptcp_setsockopt_v6(struct mptcp_sock *msk, int optname, |
a7b75c5a | 2830 | sockptr_t optval, unsigned int optlen) |
c9b95a13 FW |
2831 | { |
2832 | struct sock *sk = (struct sock *)msk; | |
2833 | int ret = -EOPNOTSUPP; | |
2834 | struct socket *ssock; | |
2835 | ||
2836 | switch (optname) { | |
2837 | case IPV6_V6ONLY: | |
2838 | lock_sock(sk); | |
2839 | ssock = __mptcp_nmpc_socket(msk); | |
2840 | if (!ssock) { | |
2841 | release_sock(sk); | |
2842 | return -EINVAL; | |
2843 | } | |
2844 | ||
2845 | ret = tcp_setsockopt(ssock->sk, SOL_IPV6, optname, optval, optlen); | |
2846 | if (ret == 0) | |
2847 | sk->sk_ipv6only = ssock->sk->sk_ipv6only; | |
2848 | ||
2849 | release_sock(sk); | |
2850 | break; | |
2851 | } | |
2852 | ||
2853 | return ret; | |
2854 | } | |
2855 | ||
717e79c8 | 2856 | static int mptcp_setsockopt(struct sock *sk, int level, int optname, |
a7b75c5a | 2857 | sockptr_t optval, unsigned int optlen) |
717e79c8 PK |
2858 | { |
2859 | struct mptcp_sock *msk = mptcp_sk(sk); | |
76660afb | 2860 | struct sock *ssk; |
717e79c8 PK |
2861 | |
2862 | pr_debug("msk=%p", msk); | |
2863 | ||
83f0c10b | 2864 | if (level == SOL_SOCKET) |
fd1452d8 | 2865 | return mptcp_setsockopt_sol_socket(msk, optname, optval, optlen); |
83f0c10b | 2866 | |
717e79c8 | 2867 | /* @@ the meaning of setsockopt() when the socket is connected and |
b6e4a1ae MM |
2868 | * there are multiple subflows is not yet defined. It is up to the |
2869 | * MPTCP-level socket to configure the subflows until the subflow | |
2870 | * is in TCP fallback, when TCP socket options are passed through | |
2871 | * to the one remaining subflow. | |
717e79c8 PK |
2872 | */ |
2873 | lock_sock(sk); | |
76660afb | 2874 | ssk = __mptcp_tcp_fallback(msk); |
e154659b | 2875 | release_sock(sk); |
76660afb PA |
2876 | if (ssk) |
2877 | return tcp_setsockopt(ssk, level, optname, optval, optlen); | |
50e741bb | 2878 | |
c9b95a13 FW |
2879 | if (level == SOL_IPV6) |
2880 | return mptcp_setsockopt_v6(msk, optname, optval, optlen); | |
2881 | ||
b6e4a1ae | 2882 | return -EOPNOTSUPP; |
717e79c8 PK |
2883 | } |
2884 | ||
2885 | static int mptcp_getsockopt(struct sock *sk, int level, int optname, | |
50e741bb | 2886 | char __user *optval, int __user *option) |
717e79c8 PK |
2887 | { |
2888 | struct mptcp_sock *msk = mptcp_sk(sk); | |
76660afb | 2889 | struct sock *ssk; |
717e79c8 PK |
2890 | |
2891 | pr_debug("msk=%p", msk); | |
2892 | ||
b6e4a1ae MM |
2893 | /* @@ the meaning of setsockopt() when the socket is connected and |
2894 | * there are multiple subflows is not yet defined. It is up to the | |
2895 | * MPTCP-level socket to configure the subflows until the subflow | |
2896 | * is in TCP fallback, when socket options are passed through | |
2897 | * to the one remaining subflow. | |
717e79c8 PK |
2898 | */ |
2899 | lock_sock(sk); | |
76660afb | 2900 | ssk = __mptcp_tcp_fallback(msk); |
e154659b | 2901 | release_sock(sk); |
76660afb PA |
2902 | if (ssk) |
2903 | return tcp_getsockopt(ssk, level, optname, optval, option); | |
50e741bb | 2904 | |
b6e4a1ae | 2905 | return -EOPNOTSUPP; |
717e79c8 PK |
2906 | } |
2907 | ||
6e628cd3 PA |
2908 | void __mptcp_data_acked(struct sock *sk) |
2909 | { | |
2910 | if (!sock_owned_by_user(sk)) | |
2911 | __mptcp_clean_una(sk); | |
2912 | else | |
2913 | set_bit(MPTCP_CLEAN_UNA, &mptcp_sk(sk)->flags); | |
2914 | ||
2915 | if (mptcp_pending_data_fin_ack(sk)) | |
2916 | mptcp_schedule_work(sk); | |
2917 | } | |
2918 | ||
219d0499 | 2919 | void __mptcp_check_push(struct sock *sk, struct sock *ssk) |
6e628cd3 PA |
2920 | { |
2921 | if (!mptcp_send_head(sk)) | |
2922 | return; | |
2923 | ||
40dc9416 | 2924 | if (!sock_owned_by_user(sk)) { |
b19bc294 PA |
2925 | struct sock *xmit_ssk = mptcp_subflow_get_send(mptcp_sk(sk)); |
2926 | ||
2927 | if (xmit_ssk == ssk) | |
40dc9416 | 2928 | __mptcp_subflow_push_pending(sk, ssk); |
b19bc294 PA |
2929 | else if (xmit_ssk) |
2930 | mptcp_subflow_delegate(mptcp_subflow_ctx(xmit_ssk)); | |
40dc9416 | 2931 | } else { |
6e628cd3 | 2932 | set_bit(MPTCP_PUSH_PENDING, &mptcp_sk(sk)->flags); |
40dc9416 | 2933 | } |
6e628cd3 PA |
2934 | } |
2935 | ||
ea4ca586 | 2936 | #define MPTCP_DEFERRED_ALL (TCPF_WRITE_TIMER_DEFERRED) |
14c441b5 | 2937 | |
e93da928 | 2938 | /* processes deferred events and flush wmem */ |
14c441b5 PA |
2939 | static void mptcp_release_cb(struct sock *sk) |
2940 | { | |
2941 | unsigned long flags, nflags; | |
2942 | ||
6e628cd3 PA |
2943 | /* push_pending may touch wmem_reserved, do it before the later |
2944 | * cleanup | |
2945 | */ | |
2946 | if (test_and_clear_bit(MPTCP_CLEAN_UNA, &mptcp_sk(sk)->flags)) | |
2947 | __mptcp_clean_una(sk); | |
2948 | if (test_and_clear_bit(MPTCP_PUSH_PENDING, &mptcp_sk(sk)->flags)) { | |
2949 | /* mptcp_push_pending() acquires the subflow socket lock | |
2950 | * | |
2951 | * 1) can't be invoked in atomic scope | |
2952 | * 2) must avoid ABBA deadlock with msk socket spinlock: the RX | |
2953 | * datapath acquires the msk socket spinlock while helding | |
2954 | * the subflow socket lock | |
2955 | */ | |
2956 | ||
2957 | spin_unlock_bh(&sk->sk_lock.slock); | |
2958 | mptcp_push_pending(sk, 0); | |
2959 | spin_lock_bh(&sk->sk_lock.slock); | |
2960 | } | |
15cc1045 PA |
2961 | if (test_and_clear_bit(MPTCP_ERROR_REPORT, &mptcp_sk(sk)->flags)) |
2962 | __mptcp_error_report(sk); | |
6e628cd3 | 2963 | |
e93da928 PA |
2964 | /* clear any wmem reservation and errors */ |
2965 | __mptcp_update_wmem(sk); | |
87952603 | 2966 | __mptcp_update_rmem(sk); |
e93da928 | 2967 | |
14c441b5 PA |
2968 | do { |
2969 | flags = sk->sk_tsq_flags; | |
2970 | if (!(flags & MPTCP_DEFERRED_ALL)) | |
2971 | return; | |
2972 | nflags = flags & ~MPTCP_DEFERRED_ALL; | |
2973 | } while (cmpxchg(&sk->sk_tsq_flags, flags, nflags) != flags); | |
2974 | ||
b51f9b80 PA |
2975 | sock_release_ownership(sk); |
2976 | ||
b51f9b80 PA |
2977 | if (flags & TCPF_WRITE_TIMER_DEFERRED) { |
2978 | mptcp_retransmit_handler(sk); | |
2979 | __sock_put(sk); | |
2980 | } | |
14c441b5 PA |
2981 | } |
2982 | ||
b19bc294 PA |
2983 | void mptcp_subflow_process_delegated(struct sock *ssk) |
2984 | { | |
2985 | struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); | |
2986 | struct sock *sk = subflow->conn; | |
2987 | ||
2988 | mptcp_data_lock(sk); | |
2989 | if (!sock_owned_by_user(sk)) | |
2990 | __mptcp_subflow_push_pending(sk, ssk); | |
2991 | else | |
2992 | set_bit(MPTCP_PUSH_PENDING, &mptcp_sk(sk)->flags); | |
2993 | mptcp_data_unlock(sk); | |
2994 | mptcp_subflow_delegated_done(subflow); | |
2995 | } | |
2996 | ||
2c5ebd00 PA |
2997 | static int mptcp_hash(struct sock *sk) |
2998 | { | |
2999 | /* should never be called, | |
3000 | * we hash the TCP subflows not the master socket | |
3001 | */ | |
3002 | WARN_ON_ONCE(1); | |
3003 | return 0; | |
3004 | } | |
3005 | ||
3006 | static void mptcp_unhash(struct sock *sk) | |
3007 | { | |
3008 | /* called from sk_common_release(), but nothing to do here */ | |
3009 | } | |
3010 | ||
cec37a6e | 3011 | static int mptcp_get_port(struct sock *sk, unsigned short snum) |
f870fa0b MM |
3012 | { |
3013 | struct mptcp_sock *msk = mptcp_sk(sk); | |
cec37a6e | 3014 | struct socket *ssock; |
f870fa0b | 3015 | |
cec37a6e PK |
3016 | ssock = __mptcp_nmpc_socket(msk); |
3017 | pr_debug("msk=%p, subflow=%p", msk, ssock); | |
3018 | if (WARN_ON_ONCE(!ssock)) | |
3019 | return -EINVAL; | |
f870fa0b | 3020 | |
cec37a6e PK |
3021 | return inet_csk_get_port(ssock->sk, snum); |
3022 | } | |
f870fa0b | 3023 | |
cec37a6e PK |
3024 | void mptcp_finish_connect(struct sock *ssk) |
3025 | { | |
3026 | struct mptcp_subflow_context *subflow; | |
3027 | struct mptcp_sock *msk; | |
3028 | struct sock *sk; | |
6d0060f6 | 3029 | u64 ack_seq; |
f870fa0b | 3030 | |
cec37a6e | 3031 | subflow = mptcp_subflow_ctx(ssk); |
cec37a6e PK |
3032 | sk = subflow->conn; |
3033 | msk = mptcp_sk(sk); | |
3034 | ||
648ef4b8 MM |
3035 | pr_debug("msk=%p, token=%u", sk, subflow->token); |
3036 | ||
6d0060f6 MM |
3037 | mptcp_crypto_key_sha(subflow->remote_key, NULL, &ack_seq); |
3038 | ack_seq++; | |
648ef4b8 MM |
3039 | subflow->map_seq = ack_seq; |
3040 | subflow->map_subflow_seq = 1; | |
6d0060f6 | 3041 | |
cec37a6e PK |
3042 | /* the socket is not connected yet, no msk/subflow ops can access/race |
3043 | * accessing the field below | |
3044 | */ | |
3045 | WRITE_ONCE(msk->remote_key, subflow->remote_key); | |
3046 | WRITE_ONCE(msk->local_key, subflow->local_key); | |
6d0060f6 | 3047 | WRITE_ONCE(msk->write_seq, subflow->idsn + 1); |
eaa2ffab | 3048 | WRITE_ONCE(msk->snd_nxt, msk->write_seq); |
6d0060f6 | 3049 | WRITE_ONCE(msk->ack_seq, ack_seq); |
fa3fe2b1 | 3050 | WRITE_ONCE(msk->rcv_wnd_sent, ack_seq); |
d22f4988 | 3051 | WRITE_ONCE(msk->can_ack, 1); |
7439d687 | 3052 | WRITE_ONCE(msk->snd_una, msk->write_seq); |
1b1c7a0e | 3053 | |
6c714f1b | 3054 | mptcp_pm_new_connection(msk, ssk, 0); |
a6b118fe FW |
3055 | |
3056 | mptcp_rcv_space_init(msk, ssk); | |
f870fa0b MM |
3057 | } |
3058 | ||
866f26f2 | 3059 | void mptcp_sock_graft(struct sock *sk, struct socket *parent) |
cf7da0d6 PK |
3060 | { |
3061 | write_lock_bh(&sk->sk_callback_lock); | |
3062 | rcu_assign_pointer(sk->sk_wq, &parent->wq); | |
3063 | sk_set_socket(sk, parent); | |
3064 | sk->sk_uid = SOCK_INODE(parent)->i_uid; | |
3065 | write_unlock_bh(&sk->sk_callback_lock); | |
3066 | } | |
3067 | ||
e16163b6 | 3068 | bool mptcp_finish_join(struct sock *ssk) |
f296234c | 3069 | { |
e16163b6 | 3070 | struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); |
f296234c PK |
3071 | struct mptcp_sock *msk = mptcp_sk(subflow->conn); |
3072 | struct sock *parent = (void *)msk; | |
3073 | struct socket *parent_sock; | |
ec3edaa7 | 3074 | bool ret; |
f296234c PK |
3075 | |
3076 | pr_debug("msk=%p, subflow=%p", msk, subflow); | |
3077 | ||
3078 | /* mptcp socket already closing? */ | |
b93df08c | 3079 | if (!mptcp_is_fully_established(parent)) |
f296234c PK |
3080 | return false; |
3081 | ||
3082 | if (!msk->pm.server_side) | |
b911c97c | 3083 | goto out; |
f296234c | 3084 | |
10f6d46c PA |
3085 | if (!mptcp_pm_allow_new_subflow(msk)) |
3086 | return false; | |
3087 | ||
3088 | /* active connections are already on conn_list, and we can't acquire | |
3089 | * msk lock here. | |
3090 | * use the join list lock as synchronization point and double-check | |
e16163b6 | 3091 | * msk status to avoid racing with __mptcp_destroy_sock() |
10f6d46c PA |
3092 | */ |
3093 | spin_lock_bh(&msk->join_list_lock); | |
3094 | ret = inet_sk_state_load(parent) == TCP_ESTABLISHED; | |
e16163b6 | 3095 | if (ret && !WARN_ON_ONCE(!list_empty(&subflow->node))) { |
10f6d46c | 3096 | list_add_tail(&subflow->node, &msk->join_list); |
e16163b6 PA |
3097 | sock_hold(ssk); |
3098 | } | |
10f6d46c PA |
3099 | spin_unlock_bh(&msk->join_list_lock); |
3100 | if (!ret) | |
3101 | return false; | |
3102 | ||
3103 | /* attach to msk socket only after we are sure he will deal with us | |
3104 | * at close time | |
3105 | */ | |
f296234c | 3106 | parent_sock = READ_ONCE(parent->sk_socket); |
e16163b6 PA |
3107 | if (parent_sock && !ssk->sk_socket) |
3108 | mptcp_sock_graft(ssk, parent_sock); | |
917944da | 3109 | subflow->map_seq = READ_ONCE(msk->ack_seq); |
b911c97c FW |
3110 | out: |
3111 | mptcp_event(MPTCP_EVENT_SUB_ESTABLISHED, msk, ssk, GFP_ATOMIC); | |
10f6d46c | 3112 | return true; |
f296234c PK |
3113 | } |
3114 | ||
76e2a55d PA |
3115 | static void mptcp_shutdown(struct sock *sk, int how) |
3116 | { | |
3117 | pr_debug("sk=%p, how=%d", sk, how); | |
3118 | ||
3119 | if ((how & SEND_SHUTDOWN) && mptcp_close_state(sk)) | |
3120 | __mptcp_wr_shutdown(sk); | |
3121 | } | |
3122 | ||
f870fa0b MM |
3123 | static struct proto mptcp_prot = { |
3124 | .name = "MPTCP", | |
3125 | .owner = THIS_MODULE, | |
3126 | .init = mptcp_init_sock, | |
18b683bf | 3127 | .disconnect = mptcp_disconnect, |
f870fa0b | 3128 | .close = mptcp_close, |
cf7da0d6 | 3129 | .accept = mptcp_accept, |
717e79c8 PK |
3130 | .setsockopt = mptcp_setsockopt, |
3131 | .getsockopt = mptcp_getsockopt, | |
76e2a55d | 3132 | .shutdown = mptcp_shutdown, |
79c0949e | 3133 | .destroy = mptcp_destroy, |
f870fa0b MM |
3134 | .sendmsg = mptcp_sendmsg, |
3135 | .recvmsg = mptcp_recvmsg, | |
14c441b5 | 3136 | .release_cb = mptcp_release_cb, |
2c5ebd00 PA |
3137 | .hash = mptcp_hash, |
3138 | .unhash = mptcp_unhash, | |
cec37a6e | 3139 | .get_port = mptcp_get_port, |
d027236c PA |
3140 | .sockets_allocated = &mptcp_sockets_allocated, |
3141 | .memory_allocated = &tcp_memory_allocated, | |
3142 | .memory_pressure = &tcp_memory_pressure, | |
d027236c | 3143 | .sysctl_wmem_offset = offsetof(struct net, ipv4.sysctl_tcp_wmem), |
989ef49b | 3144 | .sysctl_rmem_offset = offsetof(struct net, ipv4.sysctl_tcp_rmem), |
d027236c | 3145 | .sysctl_mem = sysctl_tcp_mem, |
f870fa0b | 3146 | .obj_size = sizeof(struct mptcp_sock), |
2c5ebd00 | 3147 | .slab_flags = SLAB_TYPESAFE_BY_RCU, |
f870fa0b MM |
3148 | .no_autobind = true, |
3149 | }; | |
3150 | ||
2303f994 PK |
3151 | static int mptcp_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) |
3152 | { | |
3153 | struct mptcp_sock *msk = mptcp_sk(sock->sk); | |
3154 | struct socket *ssock; | |
cf7da0d6 | 3155 | int err; |
2303f994 PK |
3156 | |
3157 | lock_sock(sock->sk); | |
fa68018d PA |
3158 | ssock = __mptcp_nmpc_socket(msk); |
3159 | if (!ssock) { | |
3160 | err = -EINVAL; | |
2303f994 PK |
3161 | goto unlock; |
3162 | } | |
3163 | ||
3164 | err = ssock->ops->bind(ssock, uaddr, addr_len); | |
cf7da0d6 PK |
3165 | if (!err) |
3166 | mptcp_copy_inaddrs(sock->sk, ssock->sk); | |
2303f994 PK |
3167 | |
3168 | unlock: | |
3169 | release_sock(sock->sk); | |
3170 | return err; | |
3171 | } | |
3172 | ||
0235d075 PA |
3173 | static void mptcp_subflow_early_fallback(struct mptcp_sock *msk, |
3174 | struct mptcp_subflow_context *subflow) | |
3175 | { | |
3176 | subflow->request_mptcp = 0; | |
3177 | __mptcp_do_fallback(msk); | |
3178 | } | |
3179 | ||
2303f994 PK |
3180 | static int mptcp_stream_connect(struct socket *sock, struct sockaddr *uaddr, |
3181 | int addr_len, int flags) | |
3182 | { | |
3183 | struct mptcp_sock *msk = mptcp_sk(sock->sk); | |
2c5ebd00 | 3184 | struct mptcp_subflow_context *subflow; |
2303f994 PK |
3185 | struct socket *ssock; |
3186 | int err; | |
3187 | ||
3188 | lock_sock(sock->sk); | |
41be81a8 PA |
3189 | if (sock->state != SS_UNCONNECTED && msk->subflow) { |
3190 | /* pending connection or invalid state, let existing subflow | |
3191 | * cope with that | |
3192 | */ | |
3193 | ssock = msk->subflow; | |
3194 | goto do_connect; | |
3195 | } | |
3196 | ||
fa68018d PA |
3197 | ssock = __mptcp_nmpc_socket(msk); |
3198 | if (!ssock) { | |
3199 | err = -EINVAL; | |
2303f994 PK |
3200 | goto unlock; |
3201 | } | |
3202 | ||
fa68018d PA |
3203 | mptcp_token_destroy(msk); |
3204 | inet_sk_state_store(sock->sk, TCP_SYN_SENT); | |
2c5ebd00 | 3205 | subflow = mptcp_subflow_ctx(ssock->sk); |
cf7da0d6 PK |
3206 | #ifdef CONFIG_TCP_MD5SIG |
3207 | /* no MPTCP if MD5SIG is enabled on this socket or we may run out of | |
3208 | * TCP option space. | |
3209 | */ | |
3210 | if (rcu_access_pointer(tcp_sk(ssock->sk)->md5sig_info)) | |
0235d075 | 3211 | mptcp_subflow_early_fallback(msk, subflow); |
cf7da0d6 | 3212 | #endif |
2c5ebd00 | 3213 | if (subflow->request_mptcp && mptcp_token_new_connect(ssock->sk)) |
0235d075 | 3214 | mptcp_subflow_early_fallback(msk, subflow); |
cf7da0d6 | 3215 | |
41be81a8 | 3216 | do_connect: |
2303f994 | 3217 | err = ssock->ops->connect(ssock, uaddr, addr_len, flags); |
41be81a8 PA |
3218 | sock->state = ssock->state; |
3219 | ||
3220 | /* on successful connect, the msk state will be moved to established by | |
3221 | * subflow_finish_connect() | |
3222 | */ | |
367fe04e | 3223 | if (!err || err == -EINPROGRESS) |
41be81a8 PA |
3224 | mptcp_copy_inaddrs(sock->sk, ssock->sk); |
3225 | else | |
3226 | inet_sk_state_store(sock->sk, inet_sk_state_load(ssock->sk)); | |
2303f994 PK |
3227 | |
3228 | unlock: | |
3229 | release_sock(sock->sk); | |
3230 | return err; | |
3231 | } | |
3232 | ||
cf7da0d6 PK |
3233 | static int mptcp_listen(struct socket *sock, int backlog) |
3234 | { | |
3235 | struct mptcp_sock *msk = mptcp_sk(sock->sk); | |
3236 | struct socket *ssock; | |
3237 | int err; | |
3238 | ||
3239 | pr_debug("msk=%p", msk); | |
3240 | ||
3241 | lock_sock(sock->sk); | |
fa68018d PA |
3242 | ssock = __mptcp_nmpc_socket(msk); |
3243 | if (!ssock) { | |
3244 | err = -EINVAL; | |
cf7da0d6 PK |
3245 | goto unlock; |
3246 | } | |
3247 | ||
fa68018d PA |
3248 | mptcp_token_destroy(msk); |
3249 | inet_sk_state_store(sock->sk, TCP_LISTEN); | |
5e20087d FW |
3250 | sock_set_flag(sock->sk, SOCK_RCU_FREE); |
3251 | ||
cf7da0d6 PK |
3252 | err = ssock->ops->listen(ssock, backlog); |
3253 | inet_sk_state_store(sock->sk, inet_sk_state_load(ssock->sk)); | |
3254 | if (!err) | |
3255 | mptcp_copy_inaddrs(sock->sk, ssock->sk); | |
3256 | ||
3257 | unlock: | |
3258 | release_sock(sock->sk); | |
3259 | return err; | |
3260 | } | |
3261 | ||
cf7da0d6 PK |
3262 | static int mptcp_stream_accept(struct socket *sock, struct socket *newsock, |
3263 | int flags, bool kern) | |
3264 | { | |
3265 | struct mptcp_sock *msk = mptcp_sk(sock->sk); | |
3266 | struct socket *ssock; | |
3267 | int err; | |
3268 | ||
3269 | pr_debug("msk=%p", msk); | |
3270 | ||
3271 | lock_sock(sock->sk); | |
3272 | if (sock->sk->sk_state != TCP_LISTEN) | |
3273 | goto unlock_fail; | |
3274 | ||
3275 | ssock = __mptcp_nmpc_socket(msk); | |
3276 | if (!ssock) | |
3277 | goto unlock_fail; | |
3278 | ||
8a05661b | 3279 | clear_bit(MPTCP_DATA_READY, &msk->flags); |
cf7da0d6 PK |
3280 | sock_hold(ssock->sk); |
3281 | release_sock(sock->sk); | |
3282 | ||
3283 | err = ssock->ops->accept(sock, newsock, flags, kern); | |
d2f77c53 | 3284 | if (err == 0 && !mptcp_is_tcpsk(newsock->sk)) { |
cf7da0d6 PK |
3285 | struct mptcp_sock *msk = mptcp_sk(newsock->sk); |
3286 | struct mptcp_subflow_context *subflow; | |
0397c6d8 | 3287 | struct sock *newsk = newsock->sk; |
0397c6d8 | 3288 | |
4d54cc32 | 3289 | lock_sock(newsk); |
5b950ff4 PA |
3290 | |
3291 | /* PM/worker can now acquire the first subflow socket | |
3292 | * lock without racing with listener queue cleanup, | |
3293 | * we can notify it, if needed. | |
3294 | */ | |
3295 | subflow = mptcp_subflow_ctx(msk->first); | |
3296 | list_add(&subflow->node, &msk->conn_list); | |
3297 | sock_hold(msk->first); | |
3298 | if (mptcp_is_fully_established(newsk)) | |
6c714f1b | 3299 | mptcp_pm_fully_established(msk, msk->first, GFP_KERNEL); |
5b950ff4 | 3300 | |
0397c6d8 PA |
3301 | mptcp_copy_inaddrs(newsk, msk->first); |
3302 | mptcp_rcv_space_init(msk, msk->first); | |
5cf92bba | 3303 | mptcp_propagate_sndbuf(newsk, msk->first); |
cf7da0d6 PK |
3304 | |
3305 | /* set ssk->sk_socket of accept()ed flows to mptcp socket. | |
3306 | * This is needed so NOSPACE flag can be set from tcp stack. | |
3307 | */ | |
ec3edaa7 | 3308 | __mptcp_flush_join_list(msk); |
190f8b06 | 3309 | mptcp_for_each_subflow(msk, subflow) { |
cf7da0d6 PK |
3310 | struct sock *ssk = mptcp_subflow_tcp_sock(subflow); |
3311 | ||
3312 | if (!ssk->sk_socket) | |
3313 | mptcp_sock_graft(ssk, newsock); | |
3314 | } | |
4d54cc32 | 3315 | release_sock(newsk); |
cf7da0d6 PK |
3316 | } |
3317 | ||
8a05661b PA |
3318 | if (inet_csk_listen_poll(ssock->sk)) |
3319 | set_bit(MPTCP_DATA_READY, &msk->flags); | |
cf7da0d6 PK |
3320 | sock_put(ssock->sk); |
3321 | return err; | |
3322 | ||
3323 | unlock_fail: | |
3324 | release_sock(sock->sk); | |
3325 | return -EINVAL; | |
3326 | } | |
3327 | ||
8a05661b PA |
3328 | static __poll_t mptcp_check_readable(struct mptcp_sock *msk) |
3329 | { | |
3330 | return test_bit(MPTCP_DATA_READY, &msk->flags) ? EPOLLIN | EPOLLRDNORM : | |
3331 | 0; | |
3332 | } | |
3333 | ||
8edf0864 FW |
3334 | static __poll_t mptcp_check_writeable(struct mptcp_sock *msk) |
3335 | { | |
3336 | struct sock *sk = (struct sock *)msk; | |
8edf0864 FW |
3337 | |
3338 | if (unlikely(sk->sk_shutdown & SEND_SHUTDOWN)) | |
dd913410 | 3339 | return EPOLLOUT | EPOLLWRNORM; |
8edf0864 FW |
3340 | |
3341 | if (sk_stream_is_writeable(sk)) | |
3342 | return EPOLLOUT | EPOLLWRNORM; | |
3343 | ||
5cf92bba | 3344 | mptcp_set_nospace(sk); |
6e628cd3 PA |
3345 | smp_mb__after_atomic(); /* msk->flags is changed by write_space cb */ |
3346 | if (sk_stream_is_writeable(sk)) | |
3347 | return EPOLLOUT | EPOLLWRNORM; | |
8edf0864 | 3348 | |
6e628cd3 | 3349 | return 0; |
8edf0864 FW |
3350 | } |
3351 | ||
2303f994 PK |
3352 | static __poll_t mptcp_poll(struct file *file, struct socket *sock, |
3353 | struct poll_table_struct *wait) | |
3354 | { | |
1891c4a0 | 3355 | struct sock *sk = sock->sk; |
8ab183de | 3356 | struct mptcp_sock *msk; |
2303f994 | 3357 | __poll_t mask = 0; |
8a05661b | 3358 | int state; |
2303f994 | 3359 | |
1891c4a0 | 3360 | msk = mptcp_sk(sk); |
1891c4a0 | 3361 | sock_poll_wait(file, sock, wait); |
1891c4a0 | 3362 | |
8a05661b | 3363 | state = inet_sk_state_load(sk); |
6719331c | 3364 | pr_debug("msk=%p state=%d flags=%lx", msk, state, msk->flags); |
8a05661b PA |
3365 | if (state == TCP_LISTEN) |
3366 | return mptcp_check_readable(msk); | |
3367 | ||
3368 | if (state != TCP_SYN_SENT && state != TCP_SYN_RECV) { | |
3369 | mask |= mptcp_check_readable(msk); | |
8edf0864 | 3370 | mask |= mptcp_check_writeable(msk); |
8a05661b | 3371 | } |
dd913410 PA |
3372 | if (sk->sk_shutdown == SHUTDOWN_MASK || state == TCP_CLOSE) |
3373 | mask |= EPOLLHUP; | |
1891c4a0 FW |
3374 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
3375 | mask |= EPOLLIN | EPOLLRDNORM | EPOLLRDHUP; | |
3376 | ||
15cc1045 PA |
3377 | /* This barrier is coupled with smp_wmb() in tcp_reset() */ |
3378 | smp_rmb(); | |
3379 | if (sk->sk_err) | |
3380 | mask |= EPOLLERR; | |
3381 | ||
2303f994 PK |
3382 | return mask; |
3383 | } | |
3384 | ||
ad98dd37 FW |
3385 | static int mptcp_release(struct socket *sock) |
3386 | { | |
3387 | struct mptcp_subflow_context *subflow; | |
3388 | struct sock *sk = sock->sk; | |
3389 | struct mptcp_sock *msk; | |
3390 | ||
3391 | if (!sk) | |
3392 | return 0; | |
3393 | ||
3394 | lock_sock(sk); | |
3395 | ||
3396 | msk = mptcp_sk(sk); | |
3397 | ||
3398 | mptcp_for_each_subflow(msk, subflow) { | |
3399 | struct sock *ssk = mptcp_subflow_tcp_sock(subflow); | |
3400 | ||
3401 | ip_mc_drop_socket(ssk); | |
3402 | } | |
3403 | ||
3404 | release_sock(sk); | |
3405 | ||
3406 | return inet_release(sock); | |
3407 | } | |
3408 | ||
e42f1ac6 FW |
3409 | static const struct proto_ops mptcp_stream_ops = { |
3410 | .family = PF_INET, | |
3411 | .owner = THIS_MODULE, | |
ad98dd37 | 3412 | .release = mptcp_release, |
e42f1ac6 FW |
3413 | .bind = mptcp_bind, |
3414 | .connect = mptcp_stream_connect, | |
3415 | .socketpair = sock_no_socketpair, | |
3416 | .accept = mptcp_stream_accept, | |
d2f77c53 | 3417 | .getname = inet_getname, |
e42f1ac6 FW |
3418 | .poll = mptcp_poll, |
3419 | .ioctl = inet_ioctl, | |
3420 | .gettstamp = sock_gettstamp, | |
3421 | .listen = mptcp_listen, | |
76e2a55d | 3422 | .shutdown = inet_shutdown, |
e42f1ac6 FW |
3423 | .setsockopt = sock_common_setsockopt, |
3424 | .getsockopt = sock_common_getsockopt, | |
3425 | .sendmsg = inet_sendmsg, | |
3426 | .recvmsg = inet_recvmsg, | |
3427 | .mmap = sock_no_mmap, | |
3428 | .sendpage = inet_sendpage, | |
e42f1ac6 | 3429 | }; |
2303f994 | 3430 | |
f870fa0b MM |
3431 | static struct inet_protosw mptcp_protosw = { |
3432 | .type = SOCK_STREAM, | |
3433 | .protocol = IPPROTO_MPTCP, | |
3434 | .prot = &mptcp_prot, | |
2303f994 PK |
3435 | .ops = &mptcp_stream_ops, |
3436 | .flags = INET_PROTOSW_ICSK, | |
f870fa0b MM |
3437 | }; |
3438 | ||
b19bc294 PA |
3439 | static int mptcp_napi_poll(struct napi_struct *napi, int budget) |
3440 | { | |
3441 | struct mptcp_delegated_action *delegated; | |
3442 | struct mptcp_subflow_context *subflow; | |
3443 | int work_done = 0; | |
3444 | ||
3445 | delegated = container_of(napi, struct mptcp_delegated_action, napi); | |
3446 | while ((subflow = mptcp_subflow_delegated_next(delegated)) != NULL) { | |
3447 | struct sock *ssk = mptcp_subflow_tcp_sock(subflow); | |
3448 | ||
3449 | bh_lock_sock_nested(ssk); | |
3450 | if (!sock_owned_by_user(ssk) && | |
3451 | mptcp_subflow_has_delegated_action(subflow)) | |
3452 | mptcp_subflow_process_delegated(ssk); | |
3453 | /* ... elsewhere tcp_release_cb_override already processed | |
3454 | * the action or will do at next release_sock(). | |
3455 | * In both case must dequeue the subflow here - on the same | |
3456 | * CPU that scheduled it. | |
3457 | */ | |
3458 | bh_unlock_sock(ssk); | |
3459 | sock_put(ssk); | |
3460 | ||
3461 | if (++work_done == budget) | |
3462 | return budget; | |
3463 | } | |
3464 | ||
3465 | /* always provide a 0 'work_done' argument, so that napi_complete_done | |
3466 | * will not try accessing the NULL napi->dev ptr | |
3467 | */ | |
3468 | napi_complete_done(napi, 0); | |
3469 | return work_done; | |
3470 | } | |
3471 | ||
d39dceca | 3472 | void __init mptcp_proto_init(void) |
f870fa0b | 3473 | { |
b19bc294 PA |
3474 | struct mptcp_delegated_action *delegated; |
3475 | int cpu; | |
3476 | ||
2303f994 | 3477 | mptcp_prot.h.hashinfo = tcp_prot.h.hashinfo; |
2303f994 | 3478 | |
d027236c PA |
3479 | if (percpu_counter_init(&mptcp_sockets_allocated, 0, GFP_KERNEL)) |
3480 | panic("Failed to allocate MPTCP pcpu counter\n"); | |
3481 | ||
b19bc294 PA |
3482 | init_dummy_netdev(&mptcp_napi_dev); |
3483 | for_each_possible_cpu(cpu) { | |
3484 | delegated = per_cpu_ptr(&mptcp_delegated_actions, cpu); | |
3485 | INIT_LIST_HEAD(&delegated->head); | |
3486 | netif_tx_napi_add(&mptcp_napi_dev, &delegated->napi, mptcp_napi_poll, | |
3487 | NAPI_POLL_WEIGHT); | |
3488 | napi_enable(&delegated->napi); | |
3489 | } | |
3490 | ||
2303f994 | 3491 | mptcp_subflow_init(); |
1b1c7a0e | 3492 | mptcp_pm_init(); |
2c5ebd00 | 3493 | mptcp_token_init(); |
2303f994 | 3494 | |
f870fa0b MM |
3495 | if (proto_register(&mptcp_prot, 1) != 0) |
3496 | panic("Failed to register MPTCP proto.\n"); | |
3497 | ||
3498 | inet_register_protosw(&mptcp_protosw); | |
6771bfd9 FW |
3499 | |
3500 | BUILD_BUG_ON(sizeof(struct mptcp_skb_cb) > sizeof_field(struct sk_buff, cb)); | |
f870fa0b MM |
3501 | } |
3502 | ||
3503 | #if IS_ENABLED(CONFIG_MPTCP_IPV6) | |
ad98dd37 FW |
3504 | static int mptcp6_release(struct socket *sock) |
3505 | { | |
3506 | struct mptcp_subflow_context *subflow; | |
3507 | struct mptcp_sock *msk; | |
3508 | struct sock *sk = sock->sk; | |
3509 | ||
3510 | if (!sk) | |
3511 | return 0; | |
3512 | ||
3513 | lock_sock(sk); | |
3514 | ||
3515 | msk = mptcp_sk(sk); | |
3516 | ||
3517 | mptcp_for_each_subflow(msk, subflow) { | |
3518 | struct sock *ssk = mptcp_subflow_tcp_sock(subflow); | |
3519 | ||
3520 | ip_mc_drop_socket(ssk); | |
3521 | ipv6_sock_mc_close(ssk); | |
3522 | ipv6_sock_ac_close(ssk); | |
3523 | } | |
3524 | ||
3525 | release_sock(sk); | |
3526 | return inet6_release(sock); | |
3527 | } | |
3528 | ||
e42f1ac6 FW |
3529 | static const struct proto_ops mptcp_v6_stream_ops = { |
3530 | .family = PF_INET6, | |
3531 | .owner = THIS_MODULE, | |
ad98dd37 | 3532 | .release = mptcp6_release, |
e42f1ac6 FW |
3533 | .bind = mptcp_bind, |
3534 | .connect = mptcp_stream_connect, | |
3535 | .socketpair = sock_no_socketpair, | |
3536 | .accept = mptcp_stream_accept, | |
d2f77c53 | 3537 | .getname = inet6_getname, |
e42f1ac6 FW |
3538 | .poll = mptcp_poll, |
3539 | .ioctl = inet6_ioctl, | |
3540 | .gettstamp = sock_gettstamp, | |
3541 | .listen = mptcp_listen, | |
76e2a55d | 3542 | .shutdown = inet_shutdown, |
e42f1ac6 FW |
3543 | .setsockopt = sock_common_setsockopt, |
3544 | .getsockopt = sock_common_getsockopt, | |
3545 | .sendmsg = inet6_sendmsg, | |
3546 | .recvmsg = inet6_recvmsg, | |
3547 | .mmap = sock_no_mmap, | |
3548 | .sendpage = inet_sendpage, | |
3549 | #ifdef CONFIG_COMPAT | |
3986912f | 3550 | .compat_ioctl = inet6_compat_ioctl, |
e42f1ac6 FW |
3551 | #endif |
3552 | }; | |
3553 | ||
f870fa0b MM |
3554 | static struct proto mptcp_v6_prot; |
3555 | ||
79c0949e PK |
3556 | static void mptcp_v6_destroy(struct sock *sk) |
3557 | { | |
3558 | mptcp_destroy(sk); | |
3559 | inet6_destroy_sock(sk); | |
3560 | } | |
3561 | ||
f870fa0b MM |
3562 | static struct inet_protosw mptcp_v6_protosw = { |
3563 | .type = SOCK_STREAM, | |
3564 | .protocol = IPPROTO_MPTCP, | |
3565 | .prot = &mptcp_v6_prot, | |
2303f994 | 3566 | .ops = &mptcp_v6_stream_ops, |
f870fa0b MM |
3567 | .flags = INET_PROTOSW_ICSK, |
3568 | }; | |
3569 | ||
d39dceca | 3570 | int __init mptcp_proto_v6_init(void) |
f870fa0b MM |
3571 | { |
3572 | int err; | |
3573 | ||
3574 | mptcp_v6_prot = mptcp_prot; | |
3575 | strcpy(mptcp_v6_prot.name, "MPTCPv6"); | |
3576 | mptcp_v6_prot.slab = NULL; | |
79c0949e | 3577 | mptcp_v6_prot.destroy = mptcp_v6_destroy; |
b0519de8 | 3578 | mptcp_v6_prot.obj_size = sizeof(struct mptcp6_sock); |
f870fa0b MM |
3579 | |
3580 | err = proto_register(&mptcp_v6_prot, 1); | |
3581 | if (err) | |
3582 | return err; | |
3583 | ||
3584 | err = inet6_register_protosw(&mptcp_v6_protosw); | |
3585 | if (err) | |
3586 | proto_unregister(&mptcp_v6_prot); | |
3587 | ||
3588 | return err; | |
3589 | } | |
3590 | #endif |