Commit | Line | Data |
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f870fa0b MM |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* Multipath TCP | |
3 | * | |
4 | * Copyright (c) 2017 - 2019, Intel Corporation. | |
5 | */ | |
6 | ||
7 | #define pr_fmt(fmt) "MPTCP: " fmt | |
8 | ||
9 | #include <linux/kernel.h> | |
10 | #include <linux/module.h> | |
11 | #include <linux/netdevice.h> | |
7a6a6cbc PA |
12 | #include <linux/sched/signal.h> |
13 | #include <linux/atomic.h> | |
f870fa0b MM |
14 | #include <net/sock.h> |
15 | #include <net/inet_common.h> | |
16 | #include <net/inet_hashtables.h> | |
17 | #include <net/protocol.h> | |
18 | #include <net/tcp.h> | |
3721b9b6 | 19 | #include <net/tcp_states.h> |
cf7da0d6 PK |
20 | #if IS_ENABLED(CONFIG_MPTCP_IPV6) |
21 | #include <net/transp_v6.h> | |
22 | #endif | |
f870fa0b | 23 | #include <net/mptcp.h> |
e16163b6 | 24 | #include <net/xfrm.h> |
644807e3 | 25 | #include <asm/ioctls.h> |
f870fa0b | 26 | #include "protocol.h" |
fc518953 | 27 | #include "mib.h" |
f870fa0b | 28 | |
e10a9892 GT |
29 | #define CREATE_TRACE_POINTS |
30 | #include <trace/events/mptcp.h> | |
31 | ||
b0519de8 FW |
32 | #if IS_ENABLED(CONFIG_MPTCP_IPV6) |
33 | struct mptcp6_sock { | |
34 | struct mptcp_sock msk; | |
35 | struct ipv6_pinfo np; | |
36 | }; | |
37 | #endif | |
38 | ||
6771bfd9 | 39 | struct mptcp_skb_cb { |
ab174ad8 PA |
40 | u64 map_seq; |
41 | u64 end_seq; | |
6771bfd9 | 42 | u32 offset; |
b7f653b2 | 43 | u8 has_rxtstamp:1; |
6771bfd9 FW |
44 | }; |
45 | ||
46 | #define MPTCP_SKB_CB(__skb) ((struct mptcp_skb_cb *)&((__skb)->cb[0])) | |
47 | ||
b7f653b2 FW |
48 | enum { |
49 | MPTCP_CMSG_TS = BIT(0), | |
2c9e7765 | 50 | MPTCP_CMSG_INQ = BIT(1), |
b7f653b2 FW |
51 | }; |
52 | ||
91b6d325 | 53 | static struct percpu_counter mptcp_sockets_allocated ____cacheline_aligned_in_smp; |
d027236c | 54 | |
e16163b6 | 55 | static void __mptcp_destroy_sock(struct sock *sk); |
d9ca1de8 | 56 | static void __mptcp_check_send_data_fin(struct sock *sk); |
e16163b6 | 57 | |
b19bc294 PA |
58 | DEFINE_PER_CPU(struct mptcp_delegated_action, mptcp_delegated_actions); |
59 | static struct net_device mptcp_napi_dev; | |
60 | ||
2303f994 PK |
61 | /* If msk has an initial subflow socket, and the MP_CAPABLE handshake has not |
62 | * completed yet or has failed, return the subflow socket. | |
63 | * Otherwise return NULL. | |
64 | */ | |
1729cf18 | 65 | struct socket *__mptcp_nmpc_socket(const struct mptcp_sock *msk) |
2303f994 | 66 | { |
d22f4988 | 67 | if (!msk->subflow || READ_ONCE(msk->can_ack)) |
2303f994 PK |
68 | return NULL; |
69 | ||
70 | return msk->subflow; | |
71 | } | |
72 | ||
6f8a612a FW |
73 | /* Returns end sequence number of the receiver's advertised window */ |
74 | static u64 mptcp_wnd_end(const struct mptcp_sock *msk) | |
75 | { | |
7439d687 | 76 | return READ_ONCE(msk->wnd_end); |
6f8a612a FW |
77 | } |
78 | ||
d2f77c53 | 79 | static bool mptcp_is_tcpsk(struct sock *sk) |
0b4f33de FW |
80 | { |
81 | struct socket *sock = sk->sk_socket; | |
82 | ||
0b4f33de FW |
83 | if (unlikely(sk->sk_prot == &tcp_prot)) { |
84 | /* we are being invoked after mptcp_accept() has | |
85 | * accepted a non-mp-capable flow: sk is a tcp_sk, | |
86 | * not an mptcp one. | |
87 | * | |
88 | * Hand the socket over to tcp so all further socket ops | |
89 | * bypass mptcp. | |
90 | */ | |
91 | sock->ops = &inet_stream_ops; | |
d2f77c53 | 92 | return true; |
0b4f33de FW |
93 | #if IS_ENABLED(CONFIG_MPTCP_IPV6) |
94 | } else if (unlikely(sk->sk_prot == &tcpv6_prot)) { | |
95 | sock->ops = &inet6_stream_ops; | |
d2f77c53 | 96 | return true; |
0b4f33de FW |
97 | #endif |
98 | } | |
99 | ||
d2f77c53 | 100 | return false; |
0b4f33de FW |
101 | } |
102 | ||
fa68018d | 103 | static int __mptcp_socket_create(struct mptcp_sock *msk) |
2303f994 PK |
104 | { |
105 | struct mptcp_subflow_context *subflow; | |
106 | struct sock *sk = (struct sock *)msk; | |
107 | struct socket *ssock; | |
108 | int err; | |
109 | ||
2303f994 PK |
110 | err = mptcp_subflow_create_socket(sk, &ssock); |
111 | if (err) | |
fa68018d | 112 | return err; |
2303f994 | 113 | |
8ab183de | 114 | msk->first = ssock->sk; |
2303f994 PK |
115 | msk->subflow = ssock; |
116 | subflow = mptcp_subflow_ctx(ssock->sk); | |
cec37a6e | 117 | list_add(&subflow->node, &msk->conn_list); |
e16163b6 | 118 | sock_hold(ssock->sk); |
2303f994 | 119 | subflow->request_mptcp = 1; |
866f26f2 | 120 | mptcp_sock_graft(msk->first, sk->sk_socket); |
e1ff9e82 | 121 | |
fa68018d | 122 | return 0; |
2303f994 PK |
123 | } |
124 | ||
ab174ad8 PA |
125 | static void mptcp_drop(struct sock *sk, struct sk_buff *skb) |
126 | { | |
127 | sk_drops_add(sk, skb); | |
128 | __kfree_skb(skb); | |
129 | } | |
130 | ||
6511882c PA |
131 | static void mptcp_rmem_charge(struct sock *sk, int size) |
132 | { | |
133 | mptcp_sk(sk)->rmem_fwd_alloc -= size; | |
134 | } | |
135 | ||
8268ed4c PA |
136 | static bool mptcp_try_coalesce(struct sock *sk, struct sk_buff *to, |
137 | struct sk_buff *from) | |
138 | { | |
139 | bool fragstolen; | |
140 | int delta; | |
141 | ||
142 | if (MPTCP_SKB_CB(from)->offset || | |
143 | !skb_try_coalesce(to, from, &fragstolen, &delta)) | |
144 | return false; | |
145 | ||
06242e44 PA |
146 | pr_debug("colesced seq %llx into %llx new len %d new end seq %llx", |
147 | MPTCP_SKB_CB(from)->map_seq, MPTCP_SKB_CB(to)->map_seq, | |
148 | to->len, MPTCP_SKB_CB(from)->end_seq); | |
ab174ad8 | 149 | MPTCP_SKB_CB(to)->end_seq = MPTCP_SKB_CB(from)->end_seq; |
8268ed4c PA |
150 | kfree_skb_partial(from, fragstolen); |
151 | atomic_add(delta, &sk->sk_rmem_alloc); | |
6511882c | 152 | mptcp_rmem_charge(sk, delta); |
8268ed4c PA |
153 | return true; |
154 | } | |
155 | ||
ab174ad8 PA |
156 | static bool mptcp_ooo_try_coalesce(struct mptcp_sock *msk, struct sk_buff *to, |
157 | struct sk_buff *from) | |
158 | { | |
159 | if (MPTCP_SKB_CB(from)->map_seq != MPTCP_SKB_CB(to)->end_seq) | |
160 | return false; | |
161 | ||
162 | return mptcp_try_coalesce((struct sock *)msk, to, from); | |
163 | } | |
164 | ||
6511882c PA |
165 | static void __mptcp_rmem_reclaim(struct sock *sk, int amount) |
166 | { | |
167 | amount >>= SK_MEM_QUANTUM_SHIFT; | |
168 | mptcp_sk(sk)->rmem_fwd_alloc -= amount << SK_MEM_QUANTUM_SHIFT; | |
169 | __sk_mem_reduce_allocated(sk, amount); | |
170 | } | |
171 | ||
172 | static void mptcp_rmem_uncharge(struct sock *sk, int size) | |
173 | { | |
174 | struct mptcp_sock *msk = mptcp_sk(sk); | |
175 | int reclaimable; | |
176 | ||
177 | msk->rmem_fwd_alloc += size; | |
178 | reclaimable = msk->rmem_fwd_alloc - sk_unused_reserved_mem(sk); | |
179 | ||
180 | /* see sk_mem_uncharge() for the rationale behind the following schema */ | |
181 | if (unlikely(reclaimable >= SK_RECLAIM_THRESHOLD)) | |
182 | __mptcp_rmem_reclaim(sk, SK_RECLAIM_CHUNK); | |
183 | } | |
184 | ||
185 | static void mptcp_rfree(struct sk_buff *skb) | |
186 | { | |
187 | unsigned int len = skb->truesize; | |
188 | struct sock *sk = skb->sk; | |
189 | ||
190 | atomic_sub(len, &sk->sk_rmem_alloc); | |
191 | mptcp_rmem_uncharge(sk, len); | |
192 | } | |
193 | ||
194 | static void mptcp_set_owner_r(struct sk_buff *skb, struct sock *sk) | |
195 | { | |
196 | skb_orphan(skb); | |
197 | skb->sk = sk; | |
198 | skb->destructor = mptcp_rfree; | |
199 | atomic_add(skb->truesize, &sk->sk_rmem_alloc); | |
200 | mptcp_rmem_charge(sk, skb->truesize); | |
201 | } | |
202 | ||
ab174ad8 PA |
203 | /* "inspired" by tcp_data_queue_ofo(), main differences: |
204 | * - use mptcp seqs | |
205 | * - don't cope with sacks | |
206 | */ | |
207 | static void mptcp_data_queue_ofo(struct mptcp_sock *msk, struct sk_buff *skb) | |
208 | { | |
209 | struct sock *sk = (struct sock *)msk; | |
210 | struct rb_node **p, *parent; | |
211 | u64 seq, end_seq, max_seq; | |
212 | struct sk_buff *skb1; | |
213 | ||
214 | seq = MPTCP_SKB_CB(skb)->map_seq; | |
215 | end_seq = MPTCP_SKB_CB(skb)->end_seq; | |
fa3fe2b1 | 216 | max_seq = READ_ONCE(msk->rcv_wnd_sent); |
ab174ad8 | 217 | |
06242e44 PA |
218 | pr_debug("msk=%p seq=%llx limit=%llx empty=%d", msk, seq, max_seq, |
219 | RB_EMPTY_ROOT(&msk->out_of_order_queue)); | |
fa3fe2b1 | 220 | if (after64(end_seq, max_seq)) { |
ab174ad8 PA |
221 | /* out of window */ |
222 | mptcp_drop(sk, skb); | |
fa3fe2b1 FW |
223 | pr_debug("oow by %lld, rcv_wnd_sent %llu\n", |
224 | (unsigned long long)end_seq - (unsigned long)max_seq, | |
225 | (unsigned long long)msk->rcv_wnd_sent); | |
06242e44 | 226 | MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_NODSSWINDOW); |
ab174ad8 PA |
227 | return; |
228 | } | |
229 | ||
230 | p = &msk->out_of_order_queue.rb_node; | |
06242e44 | 231 | MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_OFOQUEUE); |
ab174ad8 PA |
232 | if (RB_EMPTY_ROOT(&msk->out_of_order_queue)) { |
233 | rb_link_node(&skb->rbnode, NULL, p); | |
234 | rb_insert_color(&skb->rbnode, &msk->out_of_order_queue); | |
235 | msk->ooo_last_skb = skb; | |
236 | goto end; | |
237 | } | |
238 | ||
239 | /* with 2 subflows, adding at end of ooo queue is quite likely | |
240 | * Use of ooo_last_skb avoids the O(Log(N)) rbtree lookup. | |
241 | */ | |
06242e44 PA |
242 | if (mptcp_ooo_try_coalesce(msk, msk->ooo_last_skb, skb)) { |
243 | MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_OFOMERGE); | |
244 | MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_OFOQUEUETAIL); | |
ab174ad8 | 245 | return; |
06242e44 | 246 | } |
ab174ad8 PA |
247 | |
248 | /* Can avoid an rbtree lookup if we are adding skb after ooo_last_skb */ | |
249 | if (!before64(seq, MPTCP_SKB_CB(msk->ooo_last_skb)->end_seq)) { | |
06242e44 | 250 | MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_OFOQUEUETAIL); |
ab174ad8 PA |
251 | parent = &msk->ooo_last_skb->rbnode; |
252 | p = &parent->rb_right; | |
253 | goto insert; | |
254 | } | |
255 | ||
256 | /* Find place to insert this segment. Handle overlaps on the way. */ | |
257 | parent = NULL; | |
258 | while (*p) { | |
259 | parent = *p; | |
260 | skb1 = rb_to_skb(parent); | |
261 | if (before64(seq, MPTCP_SKB_CB(skb1)->map_seq)) { | |
262 | p = &parent->rb_left; | |
263 | continue; | |
264 | } | |
265 | if (before64(seq, MPTCP_SKB_CB(skb1)->end_seq)) { | |
266 | if (!after64(end_seq, MPTCP_SKB_CB(skb1)->end_seq)) { | |
267 | /* All the bits are present. Drop. */ | |
268 | mptcp_drop(sk, skb); | |
06242e44 | 269 | MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_DUPDATA); |
ab174ad8 PA |
270 | return; |
271 | } | |
272 | if (after64(seq, MPTCP_SKB_CB(skb1)->map_seq)) { | |
273 | /* partial overlap: | |
274 | * | skb | | |
275 | * | skb1 | | |
276 | * continue traversing | |
277 | */ | |
278 | } else { | |
279 | /* skb's seq == skb1's seq and skb covers skb1. | |
280 | * Replace skb1 with skb. | |
281 | */ | |
282 | rb_replace_node(&skb1->rbnode, &skb->rbnode, | |
283 | &msk->out_of_order_queue); | |
284 | mptcp_drop(sk, skb1); | |
06242e44 | 285 | MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_DUPDATA); |
ab174ad8 PA |
286 | goto merge_right; |
287 | } | |
288 | } else if (mptcp_ooo_try_coalesce(msk, skb1, skb)) { | |
06242e44 | 289 | MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_OFOMERGE); |
ab174ad8 PA |
290 | return; |
291 | } | |
292 | p = &parent->rb_right; | |
293 | } | |
06242e44 | 294 | |
ab174ad8 PA |
295 | insert: |
296 | /* Insert segment into RB tree. */ | |
297 | rb_link_node(&skb->rbnode, parent, p); | |
298 | rb_insert_color(&skb->rbnode, &msk->out_of_order_queue); | |
299 | ||
300 | merge_right: | |
301 | /* Remove other segments covered by skb. */ | |
302 | while ((skb1 = skb_rb_next(skb)) != NULL) { | |
303 | if (before64(end_seq, MPTCP_SKB_CB(skb1)->end_seq)) | |
304 | break; | |
305 | rb_erase(&skb1->rbnode, &msk->out_of_order_queue); | |
306 | mptcp_drop(sk, skb1); | |
06242e44 | 307 | MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_DUPDATA); |
ab174ad8 PA |
308 | } |
309 | /* If there is no skb after us, we are the last_skb ! */ | |
310 | if (!skb1) | |
311 | msk->ooo_last_skb = skb; | |
312 | ||
313 | end: | |
314 | skb_condense(skb); | |
6511882c PA |
315 | mptcp_set_owner_r(skb, sk); |
316 | } | |
317 | ||
318 | static bool mptcp_rmem_schedule(struct sock *sk, struct sock *ssk, int size) | |
319 | { | |
320 | struct mptcp_sock *msk = mptcp_sk(sk); | |
321 | int amt, amount; | |
322 | ||
323 | if (size < msk->rmem_fwd_alloc) | |
324 | return true; | |
325 | ||
326 | amt = sk_mem_pages(size); | |
327 | amount = amt << SK_MEM_QUANTUM_SHIFT; | |
328 | msk->rmem_fwd_alloc += amount; | |
329 | if (!__sk_mem_raise_allocated(sk, size, amt, SK_MEM_RECV)) { | |
330 | if (ssk->sk_forward_alloc < amount) { | |
331 | msk->rmem_fwd_alloc -= amount; | |
332 | return false; | |
333 | } | |
334 | ||
335 | ssk->sk_forward_alloc -= amount; | |
336 | } | |
337 | return true; | |
ab174ad8 PA |
338 | } |
339 | ||
340 | static bool __mptcp_move_skb(struct mptcp_sock *msk, struct sock *ssk, | |
341 | struct sk_buff *skb, unsigned int offset, | |
342 | size_t copy_len) | |
6771bfd9 | 343 | { |
ab174ad8 | 344 | struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); |
6771bfd9 | 345 | struct sock *sk = (struct sock *)msk; |
4e637c70 | 346 | struct sk_buff *tail; |
b7f653b2 | 347 | bool has_rxtstamp; |
6771bfd9 FW |
348 | |
349 | __skb_unlink(skb, &ssk->sk_receive_queue); | |
6771bfd9 | 350 | |
4e637c70 FW |
351 | skb_ext_reset(skb); |
352 | skb_orphan(skb); | |
ab174ad8 | 353 | |
9c3f94e1 | 354 | /* try to fetch required memory from subflow */ |
6511882c PA |
355 | if (!mptcp_rmem_schedule(sk, ssk, skb->truesize)) |
356 | goto drop; | |
9c3f94e1 | 357 | |
b7f653b2 FW |
358 | has_rxtstamp = TCP_SKB_CB(skb)->has_rxtstamp; |
359 | ||
ab174ad8 PA |
360 | /* the skb map_seq accounts for the skb offset: |
361 | * mptcp_subflow_get_mapped_dsn() is based on the current tp->copied_seq | |
362 | * value | |
363 | */ | |
364 | MPTCP_SKB_CB(skb)->map_seq = mptcp_subflow_get_mapped_dsn(subflow); | |
365 | MPTCP_SKB_CB(skb)->end_seq = MPTCP_SKB_CB(skb)->map_seq + copy_len; | |
8268ed4c | 366 | MPTCP_SKB_CB(skb)->offset = offset; |
b7f653b2 | 367 | MPTCP_SKB_CB(skb)->has_rxtstamp = has_rxtstamp; |
4e637c70 | 368 | |
ab174ad8 PA |
369 | if (MPTCP_SKB_CB(skb)->map_seq == msk->ack_seq) { |
370 | /* in sequence */ | |
8b0308fe | 371 | WRITE_ONCE(msk->ack_seq, msk->ack_seq + copy_len); |
ab174ad8 PA |
372 | tail = skb_peek_tail(&sk->sk_receive_queue); |
373 | if (tail && mptcp_try_coalesce(sk, tail, skb)) | |
374 | return true; | |
4e637c70 | 375 | |
6511882c | 376 | mptcp_set_owner_r(skb, sk); |
ab174ad8 PA |
377 | __skb_queue_tail(&sk->sk_receive_queue, skb); |
378 | return true; | |
379 | } else if (after64(MPTCP_SKB_CB(skb)->map_seq, msk->ack_seq)) { | |
380 | mptcp_data_queue_ofo(msk, skb); | |
381 | return false; | |
382 | } | |
383 | ||
384 | /* old data, keep it simple and drop the whole pkt, sender | |
385 | * will retransmit as needed, if needed. | |
386 | */ | |
06242e44 | 387 | MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_DUPDATA); |
9c3f94e1 | 388 | drop: |
ab174ad8 PA |
389 | mptcp_drop(sk, skb); |
390 | return false; | |
6771bfd9 FW |
391 | } |
392 | ||
16a9a9da MM |
393 | static void mptcp_stop_timer(struct sock *sk) |
394 | { | |
395 | struct inet_connection_sock *icsk = inet_csk(sk); | |
396 | ||
397 | sk_stop_timer(sk, &icsk->icsk_retransmit_timer); | |
398 | mptcp_sk(sk)->timer_ival = 0; | |
399 | } | |
400 | ||
e16163b6 PA |
401 | static void mptcp_close_wake_up(struct sock *sk) |
402 | { | |
403 | if (sock_flag(sk, SOCK_DEAD)) | |
404 | return; | |
405 | ||
406 | sk->sk_state_change(sk); | |
407 | if (sk->sk_shutdown == SHUTDOWN_MASK || | |
408 | sk->sk_state == TCP_CLOSE) | |
409 | sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_HUP); | |
410 | else | |
411 | sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN); | |
412 | } | |
413 | ||
6e628cd3 | 414 | static bool mptcp_pending_data_fin_ack(struct sock *sk) |
16a9a9da MM |
415 | { |
416 | struct mptcp_sock *msk = mptcp_sk(sk); | |
417 | ||
6e628cd3 PA |
418 | return !__mptcp_check_fallback(msk) && |
419 | ((1 << sk->sk_state) & | |
420 | (TCPF_FIN_WAIT1 | TCPF_CLOSING | TCPF_LAST_ACK)) && | |
421 | msk->write_seq == READ_ONCE(msk->snd_una); | |
422 | } | |
423 | ||
424 | static void mptcp_check_data_fin_ack(struct sock *sk) | |
425 | { | |
426 | struct mptcp_sock *msk = mptcp_sk(sk); | |
16a9a9da MM |
427 | |
428 | /* Look for an acknowledged DATA_FIN */ | |
6e628cd3 | 429 | if (mptcp_pending_data_fin_ack(sk)) { |
16a9a9da MM |
430 | WRITE_ONCE(msk->snd_data_fin_enable, 0); |
431 | ||
432 | switch (sk->sk_state) { | |
433 | case TCP_FIN_WAIT1: | |
434 | inet_sk_state_store(sk, TCP_FIN_WAIT2); | |
16a9a9da MM |
435 | break; |
436 | case TCP_CLOSING: | |
16a9a9da MM |
437 | case TCP_LAST_ACK: |
438 | inet_sk_state_store(sk, TCP_CLOSE); | |
16a9a9da MM |
439 | break; |
440 | } | |
441 | ||
e16163b6 | 442 | mptcp_close_wake_up(sk); |
16a9a9da MM |
443 | } |
444 | } | |
445 | ||
3721b9b6 MM |
446 | static bool mptcp_pending_data_fin(struct sock *sk, u64 *seq) |
447 | { | |
448 | struct mptcp_sock *msk = mptcp_sk(sk); | |
449 | ||
450 | if (READ_ONCE(msk->rcv_data_fin) && | |
451 | ((1 << sk->sk_state) & | |
452 | (TCPF_ESTABLISHED | TCPF_FIN_WAIT1 | TCPF_FIN_WAIT2))) { | |
453 | u64 rcv_data_fin_seq = READ_ONCE(msk->rcv_data_fin_seq); | |
454 | ||
455 | if (msk->ack_seq == rcv_data_fin_seq) { | |
456 | if (seq) | |
457 | *seq = rcv_data_fin_seq; | |
458 | ||
459 | return true; | |
460 | } | |
461 | } | |
462 | ||
463 | return false; | |
464 | } | |
465 | ||
6477dd39 MM |
466 | static void mptcp_set_datafin_timeout(const struct sock *sk) |
467 | { | |
468 | struct inet_connection_sock *icsk = inet_csk(sk); | |
469 | ||
470 | mptcp_sk(sk)->timer_ival = min(TCP_RTO_MAX, | |
471 | TCP_RTO_MIN << icsk->icsk_retransmits); | |
472 | } | |
473 | ||
33d41c9c | 474 | static void __mptcp_set_timeout(struct sock *sk, long tout) |
3721b9b6 | 475 | { |
3721b9b6 MM |
476 | mptcp_sk(sk)->timer_ival = tout > 0 ? tout : TCP_RTO_MIN; |
477 | } | |
478 | ||
33d41c9c PA |
479 | static long mptcp_timeout_from_subflow(const struct mptcp_subflow_context *subflow) |
480 | { | |
481 | const struct sock *ssk = mptcp_subflow_tcp_sock(subflow); | |
482 | ||
71b7dec2 PA |
483 | return inet_csk(ssk)->icsk_pending && !subflow->stale_count ? |
484 | inet_csk(ssk)->icsk_timeout - jiffies : 0; | |
33d41c9c PA |
485 | } |
486 | ||
487 | static void mptcp_set_timeout(struct sock *sk) | |
488 | { | |
489 | struct mptcp_subflow_context *subflow; | |
490 | long tout = 0; | |
491 | ||
492 | mptcp_for_each_subflow(mptcp_sk(sk), subflow) | |
493 | tout = max(tout, mptcp_timeout_from_subflow(subflow)); | |
494 | __mptcp_set_timeout(sk, tout); | |
495 | } | |
496 | ||
fd897679 PA |
497 | static bool tcp_can_send_ack(const struct sock *ssk) |
498 | { | |
499 | return !((1 << inet_sk_state_load(ssk)) & | |
20bc80b6 | 500 | (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_TIME_WAIT | TCPF_CLOSE | TCPF_LISTEN)); |
fd897679 PA |
501 | } |
502 | ||
340fa666 MM |
503 | void mptcp_subflow_send_ack(struct sock *ssk) |
504 | { | |
505 | bool slow; | |
506 | ||
507 | slow = lock_sock_fast(ssk); | |
508 | if (tcp_can_send_ack(ssk)) | |
509 | tcp_send_ack(ssk); | |
510 | unlock_sock_fast(ssk, slow); | |
511 | } | |
512 | ||
fd897679 | 513 | static void mptcp_send_ack(struct mptcp_sock *msk) |
7ed90803 PA |
514 | { |
515 | struct mptcp_subflow_context *subflow; | |
516 | ||
340fa666 MM |
517 | mptcp_for_each_subflow(msk, subflow) |
518 | mptcp_subflow_send_ack(mptcp_subflow_tcp_sock(subflow)); | |
fd897679 PA |
519 | } |
520 | ||
fde56eea | 521 | static void mptcp_subflow_cleanup_rbuf(struct sock *ssk) |
fd897679 | 522 | { |
75e908c3 | 523 | bool slow; |
fd897679 | 524 | |
75e908c3 | 525 | slow = lock_sock_fast(ssk); |
fde56eea | 526 | if (tcp_can_send_ack(ssk)) |
fd897679 | 527 | tcp_cleanup_rbuf(ssk, 1); |
75e908c3 | 528 | unlock_sock_fast(ssk, slow); |
fde56eea PA |
529 | } |
530 | ||
531 | static bool mptcp_subflow_could_cleanup(const struct sock *ssk, bool rx_empty) | |
532 | { | |
533 | const struct inet_connection_sock *icsk = inet_csk(ssk); | |
c4512c63 | 534 | u8 ack_pending = READ_ONCE(icsk->icsk_ack.pending); |
fde56eea PA |
535 | const struct tcp_sock *tp = tcp_sk(ssk); |
536 | ||
537 | return (ack_pending & ICSK_ACK_SCHED) && | |
538 | ((READ_ONCE(tp->rcv_nxt) - READ_ONCE(tp->rcv_wup) > | |
539 | READ_ONCE(icsk->icsk_ack.rcv_mss)) || | |
540 | (rx_empty && ack_pending & | |
541 | (ICSK_ACK_PUSHED2 | ICSK_ACK_PUSHED))); | |
fd897679 PA |
542 | } |
543 | ||
544 | static void mptcp_cleanup_rbuf(struct mptcp_sock *msk) | |
545 | { | |
e3859603 | 546 | int old_space = READ_ONCE(msk->old_wspace); |
fd897679 | 547 | struct mptcp_subflow_context *subflow; |
e3859603 | 548 | struct sock *sk = (struct sock *)msk; |
fde56eea PA |
549 | int space = __mptcp_space(sk); |
550 | bool cleanup, rx_empty; | |
e3859603 | 551 | |
fde56eea | 552 | cleanup = (space > 0) && (space >= (old_space << 1)); |
ce599c51 | 553 | rx_empty = !__mptcp_rmem(sk); |
fd897679 | 554 | |
fde56eea PA |
555 | mptcp_for_each_subflow(msk, subflow) { |
556 | struct sock *ssk = mptcp_subflow_tcp_sock(subflow); | |
fd897679 | 557 | |
fde56eea PA |
558 | if (cleanup || mptcp_subflow_could_cleanup(ssk, rx_empty)) |
559 | mptcp_subflow_cleanup_rbuf(ssk); | |
7ed90803 PA |
560 | } |
561 | } | |
562 | ||
563 | static bool mptcp_check_data_fin(struct sock *sk) | |
3721b9b6 MM |
564 | { |
565 | struct mptcp_sock *msk = mptcp_sk(sk); | |
566 | u64 rcv_data_fin_seq; | |
7ed90803 | 567 | bool ret = false; |
3721b9b6 | 568 | |
781bf13d | 569 | if (__mptcp_check_fallback(msk)) |
7ed90803 | 570 | return ret; |
3721b9b6 MM |
571 | |
572 | /* Need to ack a DATA_FIN received from a peer while this side | |
573 | * of the connection is in ESTABLISHED, FIN_WAIT1, or FIN_WAIT2. | |
574 | * msk->rcv_data_fin was set when parsing the incoming options | |
575 | * at the subflow level and the msk lock was not held, so this | |
576 | * is the first opportunity to act on the DATA_FIN and change | |
577 | * the msk state. | |
578 | * | |
579 | * If we are caught up to the sequence number of the incoming | |
580 | * DATA_FIN, send the DATA_ACK now and do state transition. If | |
581 | * not caught up, do nothing and let the recv code send DATA_ACK | |
582 | * when catching up. | |
583 | */ | |
584 | ||
585 | if (mptcp_pending_data_fin(sk, &rcv_data_fin_seq)) { | |
917944da | 586 | WRITE_ONCE(msk->ack_seq, msk->ack_seq + 1); |
3721b9b6 MM |
587 | WRITE_ONCE(msk->rcv_data_fin, 0); |
588 | ||
589 | sk->sk_shutdown |= RCV_SHUTDOWN; | |
16a9a9da | 590 | smp_mb__before_atomic(); /* SHUTDOWN must be visible first */ |
3721b9b6 MM |
591 | |
592 | switch (sk->sk_state) { | |
593 | case TCP_ESTABLISHED: | |
594 | inet_sk_state_store(sk, TCP_CLOSE_WAIT); | |
595 | break; | |
596 | case TCP_FIN_WAIT1: | |
597 | inet_sk_state_store(sk, TCP_CLOSING); | |
598 | break; | |
599 | case TCP_FIN_WAIT2: | |
600 | inet_sk_state_store(sk, TCP_CLOSE); | |
3721b9b6 MM |
601 | break; |
602 | default: | |
603 | /* Other states not expected */ | |
604 | WARN_ON_ONCE(1); | |
605 | break; | |
606 | } | |
607 | ||
7ed90803 | 608 | ret = true; |
fd897679 | 609 | mptcp_send_ack(msk); |
e16163b6 | 610 | mptcp_close_wake_up(sk); |
3721b9b6 | 611 | } |
7ed90803 | 612 | return ret; |
3721b9b6 MM |
613 | } |
614 | ||
6771bfd9 FW |
615 | static bool __mptcp_move_skbs_from_subflow(struct mptcp_sock *msk, |
616 | struct sock *ssk, | |
617 | unsigned int *bytes) | |
618 | { | |
619 | struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); | |
600911ff | 620 | struct sock *sk = (struct sock *)msk; |
6771bfd9 FW |
621 | unsigned int moved = 0; |
622 | bool more_data_avail; | |
623 | struct tcp_sock *tp; | |
624 | bool done = false; | |
13c7ba0c FW |
625 | int sk_rbuf; |
626 | ||
627 | sk_rbuf = READ_ONCE(sk->sk_rcvbuf); | |
628 | ||
629 | if (!(sk->sk_userlocks & SOCK_RCVBUF_LOCK)) { | |
630 | int ssk_rbuf = READ_ONCE(ssk->sk_rcvbuf); | |
631 | ||
632 | if (unlikely(ssk_rbuf > sk_rbuf)) { | |
633 | WRITE_ONCE(sk->sk_rcvbuf, ssk_rbuf); | |
634 | sk_rbuf = ssk_rbuf; | |
635 | } | |
636 | } | |
600911ff | 637 | |
ab174ad8 | 638 | pr_debug("msk=%p ssk=%p", msk, ssk); |
6771bfd9 FW |
639 | tp = tcp_sk(ssk); |
640 | do { | |
641 | u32 map_remaining, offset; | |
642 | u32 seq = tp->copied_seq; | |
643 | struct sk_buff *skb; | |
644 | bool fin; | |
645 | ||
646 | /* try to move as much data as available */ | |
647 | map_remaining = subflow->map_data_len - | |
648 | mptcp_subflow_get_map_offset(subflow); | |
649 | ||
650 | skb = skb_peek(&ssk->sk_receive_queue); | |
d9fb8c50 PA |
651 | if (!skb) { |
652 | /* if no data is found, a racing workqueue/recvmsg | |
653 | * already processed the new data, stop here or we | |
654 | * can enter an infinite loop | |
655 | */ | |
656 | if (!moved) | |
657 | done = true; | |
6771bfd9 | 658 | break; |
d9fb8c50 | 659 | } |
6771bfd9 | 660 | |
e1ff9e82 DC |
661 | if (__mptcp_check_fallback(msk)) { |
662 | /* if we are running under the workqueue, TCP could have | |
663 | * collapsed skbs between dummy map creation and now | |
664 | * be sure to adjust the size | |
665 | */ | |
666 | map_remaining = skb->len; | |
667 | subflow->map_data_len = skb->len; | |
668 | } | |
669 | ||
6771bfd9 FW |
670 | offset = seq - TCP_SKB_CB(skb)->seq; |
671 | fin = TCP_SKB_CB(skb)->tcp_flags & TCPHDR_FIN; | |
672 | if (fin) { | |
673 | done = true; | |
674 | seq++; | |
675 | } | |
676 | ||
677 | if (offset < skb->len) { | |
678 | size_t len = skb->len - offset; | |
679 | ||
680 | if (tp->urg_data) | |
681 | done = true; | |
682 | ||
ab174ad8 PA |
683 | if (__mptcp_move_skb(msk, ssk, skb, offset, len)) |
684 | moved += len; | |
6771bfd9 | 685 | seq += len; |
6771bfd9 FW |
686 | |
687 | if (WARN_ON_ONCE(map_remaining < len)) | |
688 | break; | |
689 | } else { | |
690 | WARN_ON_ONCE(!fin); | |
691 | sk_eat_skb(ssk, skb); | |
692 | done = true; | |
693 | } | |
694 | ||
695 | WRITE_ONCE(tp->copied_seq, seq); | |
696 | more_data_avail = mptcp_subflow_data_available(ssk); | |
600911ff | 697 | |
13c7ba0c | 698 | if (atomic_read(&sk->sk_rmem_alloc) > sk_rbuf) { |
600911ff FW |
699 | done = true; |
700 | break; | |
701 | } | |
6771bfd9 FW |
702 | } while (more_data_avail); |
703 | ||
6719331c | 704 | *bytes += moved; |
6771bfd9 FW |
705 | return done; |
706 | } | |
707 | ||
87952603 | 708 | static bool __mptcp_ofo_queue(struct mptcp_sock *msk) |
ab174ad8 PA |
709 | { |
710 | struct sock *sk = (struct sock *)msk; | |
711 | struct sk_buff *skb, *tail; | |
712 | bool moved = false; | |
713 | struct rb_node *p; | |
714 | u64 end_seq; | |
715 | ||
716 | p = rb_first(&msk->out_of_order_queue); | |
06242e44 | 717 | pr_debug("msk=%p empty=%d", msk, RB_EMPTY_ROOT(&msk->out_of_order_queue)); |
ab174ad8 PA |
718 | while (p) { |
719 | skb = rb_to_skb(p); | |
720 | if (after64(MPTCP_SKB_CB(skb)->map_seq, msk->ack_seq)) | |
721 | break; | |
722 | ||
723 | p = rb_next(p); | |
724 | rb_erase(&skb->rbnode, &msk->out_of_order_queue); | |
725 | ||
726 | if (unlikely(!after64(MPTCP_SKB_CB(skb)->end_seq, | |
727 | msk->ack_seq))) { | |
728 | mptcp_drop(sk, skb); | |
06242e44 | 729 | MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_DUPDATA); |
ab174ad8 PA |
730 | continue; |
731 | } | |
732 | ||
733 | end_seq = MPTCP_SKB_CB(skb)->end_seq; | |
734 | tail = skb_peek_tail(&sk->sk_receive_queue); | |
735 | if (!tail || !mptcp_ooo_try_coalesce(msk, tail, skb)) { | |
736 | int delta = msk->ack_seq - MPTCP_SKB_CB(skb)->map_seq; | |
737 | ||
738 | /* skip overlapping data, if any */ | |
06242e44 PA |
739 | pr_debug("uncoalesced seq=%llx ack seq=%llx delta=%d", |
740 | MPTCP_SKB_CB(skb)->map_seq, msk->ack_seq, | |
741 | delta); | |
ab174ad8 | 742 | MPTCP_SKB_CB(skb)->offset += delta; |
2c9e7765 | 743 | MPTCP_SKB_CB(skb)->map_seq += delta; |
ab174ad8 PA |
744 | __skb_queue_tail(&sk->sk_receive_queue, skb); |
745 | } | |
746 | msk->ack_seq = end_seq; | |
747 | moved = true; | |
748 | } | |
749 | return moved; | |
750 | } | |
751 | ||
2e52213c FW |
752 | /* In most cases we will be able to lock the mptcp socket. If its already |
753 | * owned, we need to defer to the work queue to avoid ABBA deadlock. | |
754 | */ | |
99d1055c | 755 | static bool move_skbs_to_msk(struct mptcp_sock *msk, struct sock *ssk) |
2e52213c FW |
756 | { |
757 | struct sock *sk = (struct sock *)msk; | |
758 | unsigned int moved = 0; | |
759 | ||
87952603 PA |
760 | __mptcp_move_skbs_from_subflow(msk, ssk, &moved); |
761 | __mptcp_ofo_queue(msk); | |
499ada50 PA |
762 | if (unlikely(ssk->sk_err)) { |
763 | if (!sock_owned_by_user(sk)) | |
764 | __mptcp_error_report(sk); | |
765 | else | |
766 | set_bit(MPTCP_ERROR_REPORT, &msk->flags); | |
767 | } | |
2e52213c | 768 | |
87952603 PA |
769 | /* If the moves have caught up with the DATA_FIN sequence number |
770 | * it's time to ack the DATA_FIN and change socket state, but | |
771 | * this is not a good place to change state. Let the workqueue | |
772 | * do it. | |
773 | */ | |
774 | if (mptcp_pending_data_fin(sk, NULL)) | |
775 | mptcp_schedule_work(sk); | |
99d1055c | 776 | return moved > 0; |
2e52213c FW |
777 | } |
778 | ||
779 | void mptcp_data_ready(struct sock *sk, struct sock *ssk) | |
101f6f85 | 780 | { |
6719331c | 781 | struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); |
101f6f85 | 782 | struct mptcp_sock *msk = mptcp_sk(sk); |
13c7ba0c | 783 | int sk_rbuf, ssk_rbuf; |
101f6f85 | 784 | |
d7b1bfd0 PA |
785 | /* The peer can send data while we are shutting down this |
786 | * subflow at msk destruction time, but we must avoid enqueuing | |
787 | * more data to the msk receive queue | |
788 | */ | |
789 | if (unlikely(subflow->disposable)) | |
790 | return; | |
791 | ||
13c7ba0c FW |
792 | ssk_rbuf = READ_ONCE(ssk->sk_rcvbuf); |
793 | sk_rbuf = READ_ONCE(sk->sk_rcvbuf); | |
794 | if (unlikely(ssk_rbuf > sk_rbuf)) | |
795 | sk_rbuf = ssk_rbuf; | |
796 | ||
99d1055c | 797 | /* over limit? can't append more skbs to msk, Also, no need to wake-up*/ |
ce599c51 PA |
798 | if (__mptcp_rmem(sk) > sk_rbuf) { |
799 | MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_RCVPRUNED); | |
99d1055c | 800 | return; |
ce599c51 | 801 | } |
600911ff | 802 | |
99d1055c PA |
803 | /* Wake-up the reader only for in-sequence data */ |
804 | mptcp_data_lock(sk); | |
612f71d7 | 805 | if (move_skbs_to_msk(msk, ssk)) |
6719331c | 806 | sk->sk_data_ready(sk); |
612f71d7 | 807 | |
99d1055c | 808 | mptcp_data_unlock(sk); |
101f6f85 FW |
809 | } |
810 | ||
78962489 | 811 | static bool mptcp_do_flush_join_list(struct mptcp_sock *msk) |
ec3edaa7 | 812 | { |
5cf92bba | 813 | struct mptcp_subflow_context *subflow; |
df00b087 | 814 | bool ret = false; |
5cf92bba | 815 | |
ec3edaa7 | 816 | if (likely(list_empty(&msk->join_list))) |
78962489 | 817 | return false; |
ec3edaa7 PK |
818 | |
819 | spin_lock_bh(&msk->join_list_lock); | |
df00b087 FW |
820 | list_for_each_entry(subflow, &msk->join_list, node) { |
821 | u32 sseq = READ_ONCE(subflow->setsockopt_seq); | |
78962489 | 822 | |
df00b087 FW |
823 | mptcp_propagate_sndbuf((struct sock *)msk, mptcp_subflow_tcp_sock(subflow)); |
824 | if (READ_ONCE(msk->setsockopt_seq) != sseq) | |
825 | ret = true; | |
826 | } | |
ec3edaa7 PK |
827 | list_splice_tail_init(&msk->join_list, &msk->conn_list); |
828 | spin_unlock_bh(&msk->join_list_lock); | |
78962489 | 829 | |
df00b087 | 830 | return ret; |
78962489 FW |
831 | } |
832 | ||
833 | void __mptcp_flush_join_list(struct mptcp_sock *msk) | |
834 | { | |
835 | if (likely(!mptcp_do_flush_join_list(msk))) | |
836 | return; | |
837 | ||
838 | if (!test_and_set_bit(MPTCP_WORK_SYNC_SETSOCKOPT, &msk->flags)) | |
839 | mptcp_schedule_work((struct sock *)msk); | |
840 | } | |
841 | ||
842 | static void mptcp_flush_join_list(struct mptcp_sock *msk) | |
843 | { | |
844 | bool sync_needed = test_and_clear_bit(MPTCP_WORK_SYNC_SETSOCKOPT, &msk->flags); | |
845 | ||
846 | might_sleep(); | |
847 | ||
848 | if (!mptcp_do_flush_join_list(msk) && !sync_needed) | |
849 | return; | |
850 | ||
851 | mptcp_sockopt_sync_all(msk); | |
ec3edaa7 PK |
852 | } |
853 | ||
b51f9b80 PA |
854 | static bool mptcp_timer_pending(struct sock *sk) |
855 | { | |
856 | return timer_pending(&inet_csk(sk)->icsk_retransmit_timer); | |
857 | } | |
858 | ||
859 | static void mptcp_reset_timer(struct sock *sk) | |
860 | { | |
861 | struct inet_connection_sock *icsk = inet_csk(sk); | |
862 | unsigned long tout; | |
863 | ||
e16163b6 PA |
864 | /* prevent rescheduling on close */ |
865 | if (unlikely(inet_sk_state_load(sk) == TCP_CLOSE)) | |
866 | return; | |
867 | ||
33d41c9c | 868 | tout = mptcp_sk(sk)->timer_ival; |
b51f9b80 PA |
869 | sk_reset_timer(sk, &icsk->icsk_retransmit_timer, jiffies + tout); |
870 | } | |
871 | ||
ba8f48f7 PA |
872 | bool mptcp_schedule_work(struct sock *sk) |
873 | { | |
874 | if (inet_sk_state_load(sk) != TCP_CLOSE && | |
875 | schedule_work(&mptcp_sk(sk)->work)) { | |
876 | /* each subflow already holds a reference to the sk, and the | |
877 | * workqueue is invoked by a subflow, so sk can't go away here. | |
878 | */ | |
879 | sock_hold(sk); | |
880 | return true; | |
881 | } | |
882 | return false; | |
883 | } | |
884 | ||
59832e24 FW |
885 | void mptcp_subflow_eof(struct sock *sk) |
886 | { | |
ba8f48f7 PA |
887 | if (!test_and_set_bit(MPTCP_WORK_EOF, &mptcp_sk(sk)->flags)) |
888 | mptcp_schedule_work(sk); | |
59832e24 FW |
889 | } |
890 | ||
5969856a PA |
891 | static void mptcp_check_for_eof(struct mptcp_sock *msk) |
892 | { | |
893 | struct mptcp_subflow_context *subflow; | |
894 | struct sock *sk = (struct sock *)msk; | |
895 | int receivers = 0; | |
896 | ||
897 | mptcp_for_each_subflow(msk, subflow) | |
898 | receivers += !subflow->rx_eof; | |
e16163b6 PA |
899 | if (receivers) |
900 | return; | |
5969856a | 901 | |
e16163b6 | 902 | if (!(sk->sk_shutdown & RCV_SHUTDOWN)) { |
5969856a PA |
903 | /* hopefully temporary hack: propagate shutdown status |
904 | * to msk, when all subflows agree on it | |
905 | */ | |
906 | sk->sk_shutdown |= RCV_SHUTDOWN; | |
907 | ||
908 | smp_mb__before_atomic(); /* SHUTDOWN must be visible first */ | |
5969856a PA |
909 | sk->sk_data_ready(sk); |
910 | } | |
e16163b6 PA |
911 | |
912 | switch (sk->sk_state) { | |
913 | case TCP_ESTABLISHED: | |
914 | inet_sk_state_store(sk, TCP_CLOSE_WAIT); | |
915 | break; | |
916 | case TCP_FIN_WAIT1: | |
26aa2314 PA |
917 | inet_sk_state_store(sk, TCP_CLOSING); |
918 | break; | |
919 | case TCP_FIN_WAIT2: | |
e16163b6 PA |
920 | inet_sk_state_store(sk, TCP_CLOSE); |
921 | break; | |
922 | default: | |
923 | return; | |
924 | } | |
925 | mptcp_close_wake_up(sk); | |
5969856a PA |
926 | } |
927 | ||
7a6a6cbc PA |
928 | static struct sock *mptcp_subflow_recv_lookup(const struct mptcp_sock *msk) |
929 | { | |
930 | struct mptcp_subflow_context *subflow; | |
931 | struct sock *sk = (struct sock *)msk; | |
932 | ||
933 | sock_owned_by_me(sk); | |
934 | ||
935 | mptcp_for_each_subflow(msk, subflow) { | |
99d1055c | 936 | if (READ_ONCE(subflow->data_avail)) |
7a6a6cbc PA |
937 | return mptcp_subflow_tcp_sock(subflow); |
938 | } | |
939 | ||
940 | return NULL; | |
941 | } | |
942 | ||
3f8e0aae PA |
943 | static bool mptcp_skb_can_collapse_to(u64 write_seq, |
944 | const struct sk_buff *skb, | |
945 | const struct mptcp_ext *mpext) | |
57040755 PA |
946 | { |
947 | if (!tcp_skb_can_collapse_to(skb)) | |
948 | return false; | |
949 | ||
5a369ca6 PA |
950 | /* can collapse only if MPTCP level sequence is in order and this |
951 | * mapping has not been xmitted yet | |
952 | */ | |
953 | return mpext && mpext->data_seq + mpext->data_len == write_seq && | |
954 | !mpext->frozen; | |
57040755 PA |
955 | } |
956 | ||
29249eac PA |
957 | /* we can append data to the given data frag if: |
958 | * - there is space available in the backing page_frag | |
959 | * - the data frag tail matches the current page_frag free offset | |
960 | * - the data frag end sequence number matches the current write seq | |
961 | */ | |
18b683bf PA |
962 | static bool mptcp_frag_can_collapse_to(const struct mptcp_sock *msk, |
963 | const struct page_frag *pfrag, | |
964 | const struct mptcp_data_frag *df) | |
965 | { | |
966 | return df && pfrag->page == df->page && | |
d9ca1de8 | 967 | pfrag->size - pfrag->offset > 0 && |
29249eac | 968 | pfrag->offset == (df->offset + df->data_len) && |
18b683bf PA |
969 | df->data_seq + df->data_len == msk->write_seq; |
970 | } | |
971 | ||
6511882c | 972 | static void __mptcp_mem_reclaim_partial(struct sock *sk) |
e93da928 | 973 | { |
6511882c | 974 | int reclaimable = mptcp_sk(sk)->rmem_fwd_alloc - sk_unused_reserved_mem(sk); |
e93da928 | 975 | |
765ff425 | 976 | lockdep_assert_held_once(&sk->sk_lock.slock); |
b5941f06 | 977 | |
6511882c | 978 | __mptcp_rmem_reclaim(sk, reclaimable - 1); |
1094c6fe PA |
979 | sk_mem_reclaim_partial(sk); |
980 | } | |
981 | ||
724cfd2e PA |
982 | static void mptcp_mem_reclaim_partial(struct sock *sk) |
983 | { | |
724cfd2e | 984 | mptcp_data_lock(sk); |
6511882c | 985 | __mptcp_mem_reclaim_partial(sk); |
724cfd2e PA |
986 | mptcp_data_unlock(sk); |
987 | } | |
988 | ||
d027236c PA |
989 | static void dfrag_uncharge(struct sock *sk, int len) |
990 | { | |
991 | sk_mem_uncharge(sk, len); | |
7948f6cc | 992 | sk_wmem_queued_add(sk, -len); |
d027236c PA |
993 | } |
994 | ||
995 | static void dfrag_clear(struct sock *sk, struct mptcp_data_frag *dfrag) | |
18b683bf | 996 | { |
d027236c PA |
997 | int len = dfrag->data_len + dfrag->overhead; |
998 | ||
18b683bf | 999 | list_del(&dfrag->list); |
d027236c | 1000 | dfrag_uncharge(sk, len); |
18b683bf PA |
1001 | put_page(dfrag->page); |
1002 | } | |
1003 | ||
6e628cd3 | 1004 | static void __mptcp_clean_una(struct sock *sk) |
18b683bf PA |
1005 | { |
1006 | struct mptcp_sock *msk = mptcp_sk(sk); | |
1007 | struct mptcp_data_frag *dtmp, *dfrag; | |
d027236c | 1008 | bool cleaned = false; |
e1ff9e82 DC |
1009 | u64 snd_una; |
1010 | ||
1011 | /* on fallback we just need to ignore snd_una, as this is really | |
1012 | * plain TCP | |
1013 | */ | |
1014 | if (__mptcp_check_fallback(msk)) | |
7439d687 | 1015 | msk->snd_una = READ_ONCE(msk->snd_nxt); |
6f8a612a | 1016 | |
7439d687 | 1017 | snd_una = msk->snd_una; |
18b683bf PA |
1018 | list_for_each_entry_safe(dfrag, dtmp, &msk->rtx_queue, list) { |
1019 | if (after64(dfrag->data_seq + dfrag->data_len, snd_una)) | |
1020 | break; | |
1021 | ||
1e1d9d6f PA |
1022 | if (unlikely(dfrag == msk->first_pending)) { |
1023 | /* in recovery mode can see ack after the current snd head */ | |
1024 | if (WARN_ON_ONCE(!msk->recovery)) | |
1025 | break; | |
1026 | ||
1027 | WRITE_ONCE(msk->first_pending, mptcp_send_next(sk)); | |
1028 | } | |
1029 | ||
d027236c PA |
1030 | dfrag_clear(sk, dfrag); |
1031 | cleaned = true; | |
1032 | } | |
1033 | ||
7948f6cc FW |
1034 | dfrag = mptcp_rtx_head(sk); |
1035 | if (dfrag && after64(snd_una, dfrag->data_seq)) { | |
53eb4c38 PA |
1036 | u64 delta = snd_una - dfrag->data_seq; |
1037 | ||
1e1d9d6f PA |
1038 | /* prevent wrap around in recovery mode */ |
1039 | if (unlikely(delta > dfrag->already_sent)) { | |
1040 | if (WARN_ON_ONCE(!msk->recovery)) | |
1041 | goto out; | |
1042 | if (WARN_ON_ONCE(delta > dfrag->data_len)) | |
1043 | goto out; | |
1044 | dfrag->already_sent += delta - dfrag->already_sent; | |
1045 | } | |
7948f6cc FW |
1046 | |
1047 | dfrag->data_seq += delta; | |
53eb4c38 | 1048 | dfrag->offset += delta; |
7948f6cc | 1049 | dfrag->data_len -= delta; |
d9ca1de8 | 1050 | dfrag->already_sent -= delta; |
7948f6cc FW |
1051 | |
1052 | dfrag_uncharge(sk, delta); | |
1053 | cleaned = true; | |
1054 | } | |
1055 | ||
1e1d9d6f PA |
1056 | /* all retransmitted data acked, recovery completed */ |
1057 | if (unlikely(msk->recovery) && after64(msk->snd_una, msk->recovery_snd_nxt)) | |
1058 | msk->recovery = false; | |
1059 | ||
53eb4c38 | 1060 | out: |
1094c6fe PA |
1061 | if (cleaned && tcp_under_memory_pressure(sk)) |
1062 | __mptcp_mem_reclaim_partial(sk); | |
95ed690e | 1063 | |
3241a9c0 FW |
1064 | if (snd_una == READ_ONCE(msk->snd_nxt) && |
1065 | snd_una == READ_ONCE(msk->write_seq)) { | |
33d41c9c | 1066 | if (mptcp_timer_pending(sk) && !mptcp_data_fin_enabled(msk)) |
6e628cd3 PA |
1067 | mptcp_stop_timer(sk); |
1068 | } else { | |
1069 | mptcp_reset_timer(sk); | |
18b683bf PA |
1070 | } |
1071 | } | |
1072 | ||
417789df PA |
1073 | static void __mptcp_clean_una_wakeup(struct sock *sk) |
1074 | { | |
765ff425 PA |
1075 | lockdep_assert_held_once(&sk->sk_lock.slock); |
1076 | ||
417789df PA |
1077 | __mptcp_clean_una(sk); |
1078 | mptcp_write_space(sk); | |
1079 | } | |
1080 | ||
b5941f06 PA |
1081 | static void mptcp_clean_una_wakeup(struct sock *sk) |
1082 | { | |
1083 | mptcp_data_lock(sk); | |
1084 | __mptcp_clean_una_wakeup(sk); | |
1085 | mptcp_data_unlock(sk); | |
1086 | } | |
1087 | ||
724cfd2e | 1088 | static void mptcp_enter_memory_pressure(struct sock *sk) |
18b683bf | 1089 | { |
d9ca1de8 PA |
1090 | struct mptcp_subflow_context *subflow; |
1091 | struct mptcp_sock *msk = mptcp_sk(sk); | |
1092 | bool first = true; | |
1093 | ||
18b683bf | 1094 | sk_stream_moderate_sndbuf(sk); |
d9ca1de8 PA |
1095 | mptcp_for_each_subflow(msk, subflow) { |
1096 | struct sock *ssk = mptcp_subflow_tcp_sock(subflow); | |
1097 | ||
1098 | if (first) | |
1099 | tcp_enter_memory_pressure(ssk); | |
1100 | sk_stream_moderate_sndbuf(ssk); | |
1101 | first = false; | |
1102 | } | |
724cfd2e PA |
1103 | } |
1104 | ||
1105 | /* ensure we get enough memory for the frag hdr, beyond some minimal amount of | |
1106 | * data | |
1107 | */ | |
1108 | static bool mptcp_page_frag_refill(struct sock *sk, struct page_frag *pfrag) | |
1109 | { | |
1110 | if (likely(skb_page_frag_refill(32U + sizeof(struct mptcp_data_frag), | |
1111 | pfrag, sk->sk_allocation))) | |
1112 | return true; | |
1113 | ||
1114 | mptcp_enter_memory_pressure(sk); | |
18b683bf PA |
1115 | return false; |
1116 | } | |
1117 | ||
1118 | static struct mptcp_data_frag * | |
1119 | mptcp_carve_data_frag(const struct mptcp_sock *msk, struct page_frag *pfrag, | |
1120 | int orig_offset) | |
1121 | { | |
1122 | int offset = ALIGN(orig_offset, sizeof(long)); | |
1123 | struct mptcp_data_frag *dfrag; | |
1124 | ||
1125 | dfrag = (struct mptcp_data_frag *)(page_to_virt(pfrag->page) + offset); | |
1126 | dfrag->data_len = 0; | |
1127 | dfrag->data_seq = msk->write_seq; | |
1128 | dfrag->overhead = offset - orig_offset + sizeof(struct mptcp_data_frag); | |
1129 | dfrag->offset = offset + sizeof(struct mptcp_data_frag); | |
d9ca1de8 | 1130 | dfrag->already_sent = 0; |
18b683bf PA |
1131 | dfrag->page = pfrag->page; |
1132 | ||
1133 | return dfrag; | |
1134 | } | |
1135 | ||
caf971df PA |
1136 | struct mptcp_sendmsg_info { |
1137 | int mss_now; | |
1138 | int size_goal; | |
d9ca1de8 PA |
1139 | u16 limit; |
1140 | u16 sent; | |
1141 | unsigned int flags; | |
1094c6fe | 1142 | bool data_lock_held; |
caf971df PA |
1143 | }; |
1144 | ||
6f8a612a FW |
1145 | static int mptcp_check_allowed_size(struct mptcp_sock *msk, u64 data_seq, |
1146 | int avail_size) | |
1147 | { | |
1148 | u64 window_end = mptcp_wnd_end(msk); | |
1149 | ||
1150 | if (__mptcp_check_fallback(msk)) | |
1151 | return avail_size; | |
1152 | ||
1153 | if (!before64(data_seq + avail_size, window_end)) { | |
1154 | u64 allowed_size = window_end - data_seq; | |
1155 | ||
1156 | return min_t(unsigned int, allowed_size, avail_size); | |
1157 | } | |
1158 | ||
1159 | return avail_size; | |
1160 | } | |
1161 | ||
724cfd2e PA |
1162 | static bool __mptcp_add_ext(struct sk_buff *skb, gfp_t gfp) |
1163 | { | |
1164 | struct skb_ext *mpext = __skb_ext_alloc(gfp); | |
1165 | ||
1166 | if (!mpext) | |
1167 | return false; | |
1168 | __skb_ext_set(skb, SKB_EXT_MPTCP, mpext); | |
1169 | return true; | |
1170 | } | |
1171 | ||
6e628cd3 | 1172 | static struct sk_buff *__mptcp_do_alloc_tx_skb(struct sock *sk, gfp_t gfp) |
724cfd2e PA |
1173 | { |
1174 | struct sk_buff *skb; | |
1175 | ||
6e628cd3 | 1176 | skb = alloc_skb_fclone(MAX_TCP_HEADER, gfp); |
724cfd2e | 1177 | if (likely(skb)) { |
6e628cd3 | 1178 | if (likely(__mptcp_add_ext(skb, gfp))) { |
724cfd2e | 1179 | skb_reserve(skb, MAX_TCP_HEADER); |
a52fe46e | 1180 | skb->ip_summed = CHECKSUM_PARTIAL; |
f70cad10 | 1181 | INIT_LIST_HEAD(&skb->tcp_tsorted_anchor); |
724cfd2e PA |
1182 | return skb; |
1183 | } | |
1184 | __kfree_skb(skb); | |
1185 | } else { | |
1186 | mptcp_enter_memory_pressure(sk); | |
1187 | } | |
1188 | return NULL; | |
1189 | } | |
1190 | ||
f70cad10 | 1191 | static struct sk_buff *__mptcp_alloc_tx_skb(struct sock *sk, struct sock *ssk, gfp_t gfp) |
724cfd2e | 1192 | { |
724cfd2e PA |
1193 | struct sk_buff *skb; |
1194 | ||
6e628cd3 | 1195 | skb = __mptcp_do_alloc_tx_skb(sk, gfp); |
724cfd2e | 1196 | if (!skb) |
f70cad10 | 1197 | return NULL; |
724cfd2e PA |
1198 | |
1199 | if (likely(sk_wmem_schedule(ssk, skb->truesize))) { | |
f70cad10 PA |
1200 | tcp_skb_entail(ssk, skb); |
1201 | return skb; | |
724cfd2e PA |
1202 | } |
1203 | kfree_skb(skb); | |
f70cad10 | 1204 | return NULL; |
724cfd2e PA |
1205 | } |
1206 | ||
f70cad10 | 1207 | static struct sk_buff *mptcp_alloc_tx_skb(struct sock *sk, struct sock *ssk, bool data_lock_held) |
724cfd2e | 1208 | { |
1094c6fe | 1209 | gfp_t gfp = data_lock_held ? GFP_ATOMIC : sk->sk_allocation; |
724cfd2e | 1210 | |
1094c6fe PA |
1211 | if (unlikely(tcp_under_memory_pressure(sk))) { |
1212 | if (data_lock_held) | |
1213 | __mptcp_mem_reclaim_partial(sk); | |
1214 | else | |
1215 | mptcp_mem_reclaim_partial(sk); | |
1216 | } | |
1217 | return __mptcp_alloc_tx_skb(sk, ssk, gfp); | |
724cfd2e PA |
1218 | } |
1219 | ||
d0cc2987 GT |
1220 | /* note: this always recompute the csum on the whole skb, even |
1221 | * if we just appended a single frag. More status info needed | |
1222 | */ | |
1223 | static void mptcp_update_data_checksum(struct sk_buff *skb, int added) | |
1224 | { | |
1225 | struct mptcp_ext *mpext = mptcp_get_ext(skb); | |
1226 | __wsum csum = ~csum_unfold(mpext->csum); | |
1227 | int offset = skb->len - added; | |
1228 | ||
1229 | mpext->csum = csum_fold(csum_block_add(csum, skb_checksum(skb, offset, added, 0), offset)); | |
1230 | } | |
1231 | ||
6d0060f6 | 1232 | static int mptcp_sendmsg_frag(struct sock *sk, struct sock *ssk, |
d9ca1de8 | 1233 | struct mptcp_data_frag *dfrag, |
caf971df | 1234 | struct mptcp_sendmsg_info *info) |
6d0060f6 | 1235 | { |
d9ca1de8 | 1236 | u64 data_seq = dfrag->data_seq + info->sent; |
f70cad10 | 1237 | int offset = dfrag->offset + info->sent; |
6d0060f6 | 1238 | struct mptcp_sock *msk = mptcp_sk(sk); |
6f8a612a | 1239 | bool zero_window_probe = false; |
6d0060f6 | 1240 | struct mptcp_ext *mpext = NULL; |
f70cad10 PA |
1241 | bool can_coalesce = false; |
1242 | bool reuse_skb = true; | |
1243 | struct sk_buff *skb; | |
1244 | size_t copy; | |
1245 | int i; | |
6d0060f6 | 1246 | |
e4b61351 | 1247 | pr_debug("msk=%p ssk=%p sending dfrag at seq=%llu len=%u already sent=%u", |
d9ca1de8 PA |
1248 | msk, ssk, dfrag->data_seq, dfrag->data_len, info->sent); |
1249 | ||
f70cad10 PA |
1250 | if (WARN_ON_ONCE(info->sent > info->limit || |
1251 | info->limit > dfrag->data_len)) | |
1252 | return 0; | |
1253 | ||
d9ca1de8 PA |
1254 | /* compute send limit */ |
1255 | info->mss_now = tcp_send_mss(ssk, &info->size_goal, info->flags); | |
f70cad10 PA |
1256 | copy = info->size_goal; |
1257 | ||
57040755 | 1258 | skb = tcp_write_queue_tail(ssk); |
f70cad10 | 1259 | if (skb && copy > skb->len) { |
57040755 PA |
1260 | /* Limit the write to the size available in the |
1261 | * current skb, if any, so that we create at most a new skb. | |
1262 | * Explicitly tells TCP internals to avoid collapsing on later | |
1263 | * queue management operation, to avoid breaking the ext <-> | |
1264 | * SSN association set here | |
1265 | */ | |
d9ca1de8 | 1266 | mpext = skb_ext_find(skb, SKB_EXT_MPTCP); |
1094c6fe | 1267 | if (!mptcp_skb_can_collapse_to(data_seq, skb, mpext)) { |
57040755 | 1268 | TCP_SKB_CB(skb)->eor = 1; |
1094c6fe PA |
1269 | goto alloc_skb; |
1270 | } | |
1271 | ||
f70cad10 PA |
1272 | i = skb_shinfo(skb)->nr_frags; |
1273 | can_coalesce = skb_can_coalesce(skb, i, dfrag->page, offset); | |
1274 | if (!can_coalesce && i >= sysctl_max_skb_frags) { | |
1275 | tcp_mark_push(tcp_sk(ssk), skb); | |
1276 | goto alloc_skb; | |
15e6ca97 | 1277 | } |
18b683bf | 1278 | |
f70cad10 PA |
1279 | copy -= skb->len; |
1280 | } else { | |
1094c6fe | 1281 | alloc_skb: |
f70cad10 PA |
1282 | skb = mptcp_alloc_tx_skb(sk, ssk, info->data_lock_held); |
1283 | if (!skb) | |
1284 | return -ENOMEM; | |
1285 | ||
1286 | i = skb_shinfo(skb)->nr_frags; | |
1287 | reuse_skb = false; | |
1288 | mpext = skb_ext_find(skb, SKB_EXT_MPTCP); | |
1289 | } | |
1094c6fe | 1290 | |
6f8a612a | 1291 | /* Zero window and all data acked? Probe. */ |
f70cad10 PA |
1292 | copy = mptcp_check_allowed_size(msk, data_seq, copy); |
1293 | if (copy == 0) { | |
7439d687 PA |
1294 | u64 snd_una = READ_ONCE(msk->snd_una); |
1295 | ||
f70cad10 | 1296 | if (snd_una != msk->snd_nxt) { |
27728ba8 | 1297 | tcp_remove_empty_skb(ssk); |
6f8a612a | 1298 | return 0; |
f70cad10 PA |
1299 | } |
1300 | ||
6f8a612a | 1301 | zero_window_probe = true; |
7439d687 | 1302 | data_seq = snd_una - 1; |
f70cad10 | 1303 | copy = 1; |
6f8a612a | 1304 | |
f70cad10 PA |
1305 | /* all mptcp-level data is acked, no skbs should be present into the |
1306 | * ssk write queue | |
1307 | */ | |
1308 | WARN_ON_ONCE(reuse_skb); | |
1309 | } | |
d027236c | 1310 | |
f70cad10 PA |
1311 | copy = min_t(size_t, copy, info->limit - info->sent); |
1312 | if (!sk_wmem_schedule(ssk, copy)) { | |
27728ba8 | 1313 | tcp_remove_empty_skb(ssk); |
e2223995 | 1314 | return -ENOMEM; |
35759383 | 1315 | } |
18b683bf | 1316 | |
f70cad10 PA |
1317 | if (can_coalesce) { |
1318 | skb_frag_size_add(&skb_shinfo(skb)->frags[i - 1], copy); | |
1319 | } else { | |
1320 | get_page(dfrag->page); | |
1321 | skb_fill_page_desc(skb, i, dfrag->page, offset, copy); | |
57040755 PA |
1322 | } |
1323 | ||
f70cad10 PA |
1324 | skb->len += copy; |
1325 | skb->data_len += copy; | |
1326 | skb->truesize += copy; | |
1327 | sk_wmem_queued_add(ssk, copy); | |
1328 | sk_mem_charge(ssk, copy); | |
f70cad10 PA |
1329 | WRITE_ONCE(tcp_sk(ssk)->write_seq, tcp_sk(ssk)->write_seq + copy); |
1330 | TCP_SKB_CB(skb)->end_seq += copy; | |
1331 | tcp_skb_pcount_set(skb, 0); | |
1332 | ||
1333 | /* on skb reuse we just need to update the DSS len */ | |
1334 | if (reuse_skb) { | |
1335 | TCP_SKB_CB(skb)->tcp_flags &= ~TCPHDR_PSH; | |
1336 | mpext->data_len += copy; | |
1337 | WARN_ON_ONCE(zero_window_probe); | |
1338 | goto out; | |
724cfd2e | 1339 | } |
6d0060f6 MM |
1340 | |
1341 | memset(mpext, 0, sizeof(*mpext)); | |
d9ca1de8 | 1342 | mpext->data_seq = data_seq; |
6d0060f6 | 1343 | mpext->subflow_seq = mptcp_subflow_ctx(ssk)->rel_write_seq; |
f70cad10 | 1344 | mpext->data_len = copy; |
6d0060f6 MM |
1345 | mpext->use_map = 1; |
1346 | mpext->dsn64 = 1; | |
1347 | ||
1348 | pr_debug("data_seq=%llu subflow_seq=%u data_len=%u dsn64=%d", | |
1349 | mpext->data_seq, mpext->subflow_seq, mpext->data_len, | |
1350 | mpext->dsn64); | |
1351 | ||
6f8a612a | 1352 | if (zero_window_probe) { |
f70cad10 | 1353 | mptcp_subflow_ctx(ssk)->rel_write_seq += copy; |
6f8a612a | 1354 | mpext->frozen = 1; |
d0cc2987 | 1355 | if (READ_ONCE(msk->csum_enabled)) |
f70cad10 | 1356 | mptcp_update_data_checksum(skb, copy); |
6f8a612a | 1357 | tcp_push_pending_frames(ssk); |
d0cc2987 | 1358 | return 0; |
6f8a612a | 1359 | } |
57040755 | 1360 | out: |
d0cc2987 | 1361 | if (READ_ONCE(msk->csum_enabled)) |
f70cad10 PA |
1362 | mptcp_update_data_checksum(skb, copy); |
1363 | mptcp_subflow_ctx(ssk)->rel_write_seq += copy; | |
1364 | return copy; | |
6d0060f6 MM |
1365 | } |
1366 | ||
d5f49190 PA |
1367 | #define MPTCP_SEND_BURST_SIZE ((1 << 16) - \ |
1368 | sizeof(struct tcphdr) - \ | |
1369 | MAX_TCP_OPTION_SPACE - \ | |
1370 | sizeof(struct ipv6hdr) - \ | |
1371 | sizeof(struct frag_hdr)) | |
1372 | ||
1373 | struct subflow_send_info { | |
1374 | struct sock *ssk; | |
3ce0852c | 1375 | u64 linger_time; |
d5f49190 PA |
1376 | }; |
1377 | ||
ff5a0b42 PA |
1378 | void mptcp_subflow_set_active(struct mptcp_subflow_context *subflow) |
1379 | { | |
1380 | if (!subflow->stale) | |
1381 | return; | |
1382 | ||
1383 | subflow->stale = 0; | |
fc1b4e3b | 1384 | MPTCP_INC_STATS(sock_net(mptcp_subflow_tcp_sock(subflow)), MPTCP_MIB_SUBFLOWRECOVER); |
ff5a0b42 PA |
1385 | } |
1386 | ||
1387 | bool mptcp_subflow_active(struct mptcp_subflow_context *subflow) | |
1388 | { | |
1389 | if (unlikely(subflow->stale)) { | |
1390 | u32 rcv_tstamp = READ_ONCE(tcp_sk(mptcp_subflow_tcp_sock(subflow))->rcv_tstamp); | |
1391 | ||
1392 | if (subflow->stale_rcv_tstamp == rcv_tstamp) | |
1393 | return false; | |
1394 | ||
1395 | mptcp_subflow_set_active(subflow); | |
1396 | } | |
1397 | return __mptcp_subflow_active(subflow); | |
1398 | } | |
1399 | ||
3ce0852c PA |
1400 | #define SSK_MODE_ACTIVE 0 |
1401 | #define SSK_MODE_BACKUP 1 | |
1402 | #define SSK_MODE_MAX 2 | |
1403 | ||
33d41c9c PA |
1404 | /* implement the mptcp packet scheduler; |
1405 | * returns the subflow that will transmit the next DSS | |
1406 | * additionally updates the rtx timeout | |
1407 | */ | |
5cf92bba | 1408 | static struct sock *mptcp_subflow_get_send(struct mptcp_sock *msk) |
f296234c | 1409 | { |
3ce0852c | 1410 | struct subflow_send_info send_info[SSK_MODE_MAX]; |
f296234c | 1411 | struct mptcp_subflow_context *subflow; |
33d41c9c | 1412 | struct sock *sk = (struct sock *)msk; |
3ce0852c | 1413 | u32 pace, burst, wmem; |
d5f49190 PA |
1414 | int i, nr_active = 0; |
1415 | struct sock *ssk; | |
3ce0852c | 1416 | u64 linger_time; |
33d41c9c | 1417 | long tout = 0; |
f296234c | 1418 | |
33d41c9c | 1419 | sock_owned_by_me(sk); |
f296234c | 1420 | |
d5f49190 PA |
1421 | if (__mptcp_check_fallback(msk)) { |
1422 | if (!msk->first) | |
f296234c | 1423 | return NULL; |
d5f49190 PA |
1424 | return sk_stream_memory_free(msk->first) ? msk->first : NULL; |
1425 | } | |
1426 | ||
1427 | /* re-use last subflow, if the burst allow that */ | |
1428 | if (msk->last_snd && msk->snd_burst > 0 && | |
1429 | sk_stream_memory_free(msk->last_snd) && | |
33d41c9c PA |
1430 | mptcp_subflow_active(mptcp_subflow_ctx(msk->last_snd))) { |
1431 | mptcp_set_timeout(sk); | |
d5f49190 | 1432 | return msk->last_snd; |
33d41c9c | 1433 | } |
f296234c | 1434 | |
d5f49190 | 1435 | /* pick the subflow with the lower wmem/wspace ratio */ |
3ce0852c | 1436 | for (i = 0; i < SSK_MODE_MAX; ++i) { |
d5f49190 | 1437 | send_info[i].ssk = NULL; |
3ce0852c | 1438 | send_info[i].linger_time = -1; |
d5f49190 | 1439 | } |
3ce0852c | 1440 | |
d5f49190 | 1441 | mptcp_for_each_subflow(msk, subflow) { |
e10a9892 | 1442 | trace_mptcp_subflow_get_send(subflow); |
d5f49190 PA |
1443 | ssk = mptcp_subflow_tcp_sock(subflow); |
1444 | if (!mptcp_subflow_active(subflow)) | |
1445 | continue; | |
1446 | ||
33d41c9c | 1447 | tout = max(tout, mptcp_timeout_from_subflow(subflow)); |
d5f49190 | 1448 | nr_active += !subflow->backup; |
3ce0852c PA |
1449 | pace = subflow->avg_pacing_rate; |
1450 | if (unlikely(!pace)) { | |
1451 | /* init pacing rate from socket */ | |
1452 | subflow->avg_pacing_rate = READ_ONCE(ssk->sk_pacing_rate); | |
1453 | pace = subflow->avg_pacing_rate; | |
1454 | if (!pace) | |
1455 | continue; | |
1456 | } | |
f296234c | 1457 | |
3ce0852c PA |
1458 | linger_time = div_u64((u64)READ_ONCE(ssk->sk_wmem_queued) << 32, pace); |
1459 | if (linger_time < send_info[subflow->backup].linger_time) { | |
d5f49190 | 1460 | send_info[subflow->backup].ssk = ssk; |
3ce0852c | 1461 | send_info[subflow->backup].linger_time = linger_time; |
d5f49190 | 1462 | } |
f296234c | 1463 | } |
33d41c9c | 1464 | __mptcp_set_timeout(sk, tout); |
f296234c | 1465 | |
d5f49190 PA |
1466 | /* pick the best backup if no other subflow is active */ |
1467 | if (!nr_active) | |
3ce0852c PA |
1468 | send_info[SSK_MODE_ACTIVE].ssk = send_info[SSK_MODE_BACKUP].ssk; |
1469 | ||
1470 | /* According to the blest algorithm, to avoid HoL blocking for the | |
1471 | * faster flow, we need to: | |
1472 | * - estimate the faster flow linger time | |
1473 | * - use the above to estimate the amount of byte transferred | |
1474 | * by the faster flow | |
1475 | * - check that the amount of queued data is greter than the above, | |
1476 | * otherwise do not use the picked, slower, subflow | |
1477 | * We select the subflow with the shorter estimated time to flush | |
1478 | * the queued mem, which basically ensure the above. We just need | |
1479 | * to check that subflow has a non empty cwin. | |
1480 | */ | |
1481 | ssk = send_info[SSK_MODE_ACTIVE].ssk; | |
1482 | if (!ssk || !sk_stream_memory_free(ssk) || !tcp_sk(ssk)->snd_wnd) | |
1483 | return NULL; | |
5cf92bba | 1484 | |
3ce0852c PA |
1485 | burst = min_t(int, MPTCP_SEND_BURST_SIZE, tcp_sk(ssk)->snd_wnd); |
1486 | wmem = READ_ONCE(ssk->sk_wmem_queued); | |
1487 | subflow = mptcp_subflow_ctx(ssk); | |
1488 | subflow->avg_pacing_rate = div_u64((u64)subflow->avg_pacing_rate * wmem + | |
1489 | READ_ONCE(ssk->sk_pacing_rate) * burst, | |
1490 | burst + wmem); | |
1491 | msk->last_snd = ssk; | |
1492 | msk->snd_burst = burst; | |
1493 | return ssk; | |
f296234c PK |
1494 | } |
1495 | ||
b8e0def3 | 1496 | static void mptcp_push_release(struct sock *ssk, struct mptcp_sendmsg_info *info) |
d9ca1de8 | 1497 | { |
d9ca1de8 PA |
1498 | tcp_push(ssk, 0, info->mss_now, tcp_sk(ssk)->nonagle, info->size_goal); |
1499 | release_sock(ssk); | |
1500 | } | |
1501 | ||
0d199e43 FW |
1502 | static void mptcp_update_post_push(struct mptcp_sock *msk, |
1503 | struct mptcp_data_frag *dfrag, | |
1504 | u32 sent) | |
1505 | { | |
1506 | u64 snd_nxt_new = dfrag->data_seq; | |
1507 | ||
1508 | dfrag->already_sent += sent; | |
1509 | ||
1510 | msk->snd_burst -= sent; | |
0d199e43 FW |
1511 | |
1512 | snd_nxt_new += dfrag->already_sent; | |
1513 | ||
1514 | /* snd_nxt_new can be smaller than snd_nxt in case mptcp | |
1515 | * is recovering after a failover. In that event, this re-sends | |
1516 | * old segments. | |
1517 | * | |
1518 | * Thus compute snd_nxt_new candidate based on | |
1519 | * the dfrag->data_seq that was sent and the data | |
1520 | * that has been handed to the subflow for transmission | |
1521 | * and skip update in case it was old dfrag. | |
1522 | */ | |
1523 | if (likely(after64(snd_nxt_new, msk->snd_nxt))) | |
1524 | msk->snd_nxt = snd_nxt_new; | |
1525 | } | |
1526 | ||
8b38217a | 1527 | void mptcp_check_and_set_pending(struct sock *sk) |
3241a9c0 FW |
1528 | { |
1529 | if (mptcp_send_head(sk) && | |
1530 | !test_bit(MPTCP_PUSH_PENDING, &mptcp_sk(sk)->flags)) | |
1531 | set_bit(MPTCP_PUSH_PENDING, &mptcp_sk(sk)->flags); | |
1532 | } | |
1533 | ||
ff5a0b42 | 1534 | void __mptcp_push_pending(struct sock *sk, unsigned int flags) |
f870fa0b | 1535 | { |
d9ca1de8 | 1536 | struct sock *prev_ssk = NULL, *ssk = NULL; |
f870fa0b | 1537 | struct mptcp_sock *msk = mptcp_sk(sk); |
caf971df | 1538 | struct mptcp_sendmsg_info info = { |
d9ca1de8 | 1539 | .flags = flags, |
caf971df | 1540 | }; |
d9ca1de8 PA |
1541 | struct mptcp_data_frag *dfrag; |
1542 | int len, copied = 0; | |
d9ca1de8 PA |
1543 | |
1544 | while ((dfrag = mptcp_send_head(sk))) { | |
1545 | info.sent = dfrag->already_sent; | |
1546 | info.limit = dfrag->data_len; | |
1547 | len = dfrag->data_len - dfrag->already_sent; | |
1548 | while (len > 0) { | |
1549 | int ret = 0; | |
1550 | ||
1551 | prev_ssk = ssk; | |
3d79e375 | 1552 | __mptcp_flush_join_list(msk); |
5cf92bba | 1553 | ssk = mptcp_subflow_get_send(msk); |
d9ca1de8 | 1554 | |
9758f40e PA |
1555 | /* First check. If the ssk has changed since |
1556 | * the last round, release prev_ssk | |
d9ca1de8 PA |
1557 | */ |
1558 | if (ssk != prev_ssk && prev_ssk) | |
b8e0def3 | 1559 | mptcp_push_release(prev_ssk, &info); |
d9ca1de8 PA |
1560 | if (!ssk) |
1561 | goto out; | |
1562 | ||
9758f40e PA |
1563 | /* Need to lock the new subflow only if different |
1564 | * from the previous one, otherwise we are still | |
1565 | * helding the relevant lock | |
1566 | */ | |
1567 | if (ssk != prev_ssk) | |
d9ca1de8 PA |
1568 | lock_sock(ssk); |
1569 | ||
1570 | ret = mptcp_sendmsg_frag(sk, ssk, dfrag, &info); | |
1571 | if (ret <= 0) { | |
b8e0def3 | 1572 | mptcp_push_release(ssk, &info); |
d9ca1de8 PA |
1573 | goto out; |
1574 | } | |
1575 | ||
1576 | info.sent += ret; | |
d9ca1de8 PA |
1577 | copied += ret; |
1578 | len -= ret; | |
0d199e43 FW |
1579 | |
1580 | mptcp_update_post_push(msk, dfrag, ret); | |
d9ca1de8 PA |
1581 | } |
1582 | WRITE_ONCE(msk->first_pending, mptcp_send_next(sk)); | |
1583 | } | |
1584 | ||
1585 | /* at this point we held the socket lock for the last subflow we used */ | |
1586 | if (ssk) | |
b8e0def3 | 1587 | mptcp_push_release(ssk, &info); |
d9ca1de8 PA |
1588 | |
1589 | out: | |
33d41c9c PA |
1590 | /* ensure the rtx timer is running */ |
1591 | if (!mptcp_timer_pending(sk)) | |
1592 | mptcp_reset_timer(sk); | |
1593 | if (copied) | |
d9ca1de8 PA |
1594 | __mptcp_check_send_data_fin(sk); |
1595 | } | |
1596 | ||
6e628cd3 PA |
1597 | static void __mptcp_subflow_push_pending(struct sock *sk, struct sock *ssk) |
1598 | { | |
1599 | struct mptcp_sock *msk = mptcp_sk(sk); | |
1094c6fe PA |
1600 | struct mptcp_sendmsg_info info = { |
1601 | .data_lock_held = true, | |
1602 | }; | |
6e628cd3 | 1603 | struct mptcp_data_frag *dfrag; |
b19bc294 | 1604 | struct sock *xmit_ssk; |
6e628cd3 | 1605 | int len, copied = 0; |
b19bc294 | 1606 | bool first = true; |
6e628cd3 PA |
1607 | |
1608 | info.flags = 0; | |
1609 | while ((dfrag = mptcp_send_head(sk))) { | |
1610 | info.sent = dfrag->already_sent; | |
1611 | info.limit = dfrag->data_len; | |
1612 | len = dfrag->data_len - dfrag->already_sent; | |
1613 | while (len > 0) { | |
1614 | int ret = 0; | |
1615 | ||
b19bc294 PA |
1616 | /* the caller already invoked the packet scheduler, |
1617 | * check for a different subflow usage only after | |
1618 | * spooling the first chunk of data | |
1619 | */ | |
1620 | xmit_ssk = first ? ssk : mptcp_subflow_get_send(mptcp_sk(sk)); | |
1621 | if (!xmit_ssk) | |
1622 | goto out; | |
1623 | if (xmit_ssk != ssk) { | |
bcd97734 PA |
1624 | mptcp_subflow_delegate(mptcp_subflow_ctx(xmit_ssk), |
1625 | MPTCP_DELEGATE_SEND); | |
b19bc294 PA |
1626 | goto out; |
1627 | } | |
1628 | ||
6e628cd3 PA |
1629 | ret = mptcp_sendmsg_frag(sk, ssk, dfrag, &info); |
1630 | if (ret <= 0) | |
1631 | goto out; | |
1632 | ||
1633 | info.sent += ret; | |
6e628cd3 PA |
1634 | copied += ret; |
1635 | len -= ret; | |
b19bc294 | 1636 | first = false; |
0d199e43 FW |
1637 | |
1638 | mptcp_update_post_push(msk, dfrag, ret); | |
6e628cd3 PA |
1639 | } |
1640 | WRITE_ONCE(msk->first_pending, mptcp_send_next(sk)); | |
1641 | } | |
1642 | ||
1643 | out: | |
1644 | /* __mptcp_alloc_tx_skb could have released some wmem and we are | |
1645 | * not going to flush it via release_sock() | |
1646 | */ | |
6e628cd3 | 1647 | if (copied) { |
6e628cd3 PA |
1648 | tcp_push(ssk, 0, info.mss_now, tcp_sk(ssk)->nonagle, |
1649 | info.size_goal); | |
d09d818e PA |
1650 | if (!mptcp_timer_pending(sk)) |
1651 | mptcp_reset_timer(sk); | |
1652 | ||
6e628cd3 PA |
1653 | if (msk->snd_data_fin_enable && |
1654 | msk->snd_nxt + 1 == msk->write_seq) | |
1655 | mptcp_schedule_work(sk); | |
1656 | } | |
1657 | } | |
1658 | ||
5cf92bba PA |
1659 | static void mptcp_set_nospace(struct sock *sk) |
1660 | { | |
1661 | /* enable autotune */ | |
1662 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
1663 | ||
1664 | /* will be cleared on avail space */ | |
1665 | set_bit(MPTCP_NOSPACE, &mptcp_sk(sk)->flags); | |
1666 | } | |
1667 | ||
d9ca1de8 PA |
1668 | static int mptcp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) |
1669 | { | |
1670 | struct mptcp_sock *msk = mptcp_sk(sk); | |
17091708 | 1671 | struct page_frag *pfrag; |
6d0060f6 | 1672 | size_t copied = 0; |
caf971df | 1673 | int ret = 0; |
6d0060f6 | 1674 | long timeo; |
f870fa0b | 1675 | |
987858e5 PA |
1676 | /* we don't support FASTOPEN yet */ |
1677 | if (msg->msg_flags & MSG_FASTOPEN) | |
f870fa0b MM |
1678 | return -EOPNOTSUPP; |
1679 | ||
987858e5 PA |
1680 | /* silently ignore everything else */ |
1681 | msg->msg_flags &= MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL; | |
1682 | ||
6511882c | 1683 | lock_sock(sk); |
1954b860 MM |
1684 | |
1685 | timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); | |
1686 | ||
1687 | if ((1 << sk->sk_state) & ~(TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)) { | |
1688 | ret = sk_stream_wait_connect(sk, &timeo); | |
1689 | if (ret) | |
1690 | goto out; | |
1691 | } | |
1692 | ||
17091708 | 1693 | pfrag = sk_page_frag(sk); |
18b683bf | 1694 | |
d9ca1de8 | 1695 | while (msg_data_left(msg)) { |
724cfd2e | 1696 | int total_ts, frag_truesize = 0; |
d9ca1de8 | 1697 | struct mptcp_data_frag *dfrag; |
d9ca1de8 PA |
1698 | bool dfrag_collapsed; |
1699 | size_t psize, offset; | |
18b683bf | 1700 | |
d9ca1de8 PA |
1701 | if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN)) { |
1702 | ret = -EPIPE; | |
f296234c PK |
1703 | goto out; |
1704 | } | |
da51aef5 | 1705 | |
d9ca1de8 PA |
1706 | /* reuse tail pfrag, if possible, or carve a new one from the |
1707 | * page allocator | |
1708 | */ | |
1709 | dfrag = mptcp_pending_tail(sk); | |
1710 | dfrag_collapsed = mptcp_frag_can_collapse_to(msk, pfrag, dfrag); | |
1711 | if (!dfrag_collapsed) { | |
6e628cd3 PA |
1712 | if (!sk_stream_memory_free(sk)) |
1713 | goto wait_for_memory; | |
1714 | ||
d9ca1de8 PA |
1715 | if (!mptcp_page_frag_refill(sk, pfrag)) |
1716 | goto wait_for_memory; | |
1717 | ||
1718 | dfrag = mptcp_carve_data_frag(msk, pfrag, pfrag->offset); | |
1719 | frag_truesize = dfrag->overhead; | |
72511aab | 1720 | } |
6d0060f6 | 1721 | |
d9ca1de8 PA |
1722 | /* we do not bound vs wspace, to allow a single packet. |
1723 | * memory accounting will prevent execessive memory usage | |
1724 | * anyway | |
d5f49190 | 1725 | */ |
d9ca1de8 PA |
1726 | offset = dfrag->offset + dfrag->data_len; |
1727 | psize = pfrag->size - offset; | |
1728 | psize = min_t(size_t, psize, msg_data_left(msg)); | |
724cfd2e | 1729 | total_ts = psize + frag_truesize; |
d9ca1de8 | 1730 | |
6511882c | 1731 | if (!sk_wmem_schedule(sk, total_ts)) |
724cfd2e | 1732 | goto wait_for_memory; |
724cfd2e | 1733 | |
d9ca1de8 PA |
1734 | if (copy_page_from_iter(dfrag->page, offset, psize, |
1735 | &msg->msg_iter) != psize) { | |
1736 | ret = -EFAULT; | |
1737 | goto out; | |
72511aab FW |
1738 | } |
1739 | ||
d9ca1de8 | 1740 | /* data successfully copied into the write queue */ |
6511882c | 1741 | sk->sk_forward_alloc -= total_ts; |
d9ca1de8 PA |
1742 | copied += psize; |
1743 | dfrag->data_len += psize; | |
1744 | frag_truesize += psize; | |
1745 | pfrag->offset += frag_truesize; | |
1746 | WRITE_ONCE(msk->write_seq, msk->write_seq + psize); | |
1747 | ||
1748 | /* charge data on mptcp pending queue to the msk socket | |
1749 | * Note: we charge such data both to sk and ssk | |
fb529e62 | 1750 | */ |
d9ca1de8 | 1751 | sk_wmem_queued_add(sk, frag_truesize); |
d9ca1de8 PA |
1752 | if (!dfrag_collapsed) { |
1753 | get_page(dfrag->page); | |
1754 | list_add_tail(&dfrag->list, &msk->rtx_queue); | |
1755 | if (!msk->first_pending) | |
1756 | WRITE_ONCE(msk->first_pending, dfrag); | |
fb529e62 | 1757 | } |
e4b61351 | 1758 | pr_debug("msk=%p dfrag at seq=%llu len=%u sent=%u new=%d", msk, |
d9ca1de8 PA |
1759 | dfrag->data_seq, dfrag->data_len, dfrag->already_sent, |
1760 | !dfrag_collapsed); | |
6d0060f6 | 1761 | |
d9ca1de8 | 1762 | continue; |
b51f9b80 | 1763 | |
d9ca1de8 | 1764 | wait_for_memory: |
5cf92bba | 1765 | mptcp_set_nospace(sk); |
c2e6048f | 1766 | __mptcp_push_pending(sk, msg->msg_flags); |
d9ca1de8 PA |
1767 | ret = sk_stream_wait_memory(sk, &timeo); |
1768 | if (ret) | |
1769 | goto out; | |
57040755 | 1770 | } |
6d0060f6 | 1771 | |
13e16037 | 1772 | if (copied) |
c2e6048f | 1773 | __mptcp_push_pending(sk, msg->msg_flags); |
d9ca1de8 | 1774 | |
1954b860 | 1775 | out: |
cec37a6e | 1776 | release_sock(sk); |
8555c6bf | 1777 | return copied ? : ret; |
f870fa0b MM |
1778 | } |
1779 | ||
6771bfd9 FW |
1780 | static int __mptcp_recvmsg_mskq(struct mptcp_sock *msk, |
1781 | struct msghdr *msg, | |
b7f653b2 FW |
1782 | size_t len, int flags, |
1783 | struct scm_timestamping_internal *tss, | |
1784 | int *cmsg_flags) | |
6771bfd9 | 1785 | { |
ca4fb892 | 1786 | struct sk_buff *skb, *tmp; |
6771bfd9 FW |
1787 | int copied = 0; |
1788 | ||
ca4fb892 | 1789 | skb_queue_walk_safe(&msk->receive_queue, skb, tmp) { |
6771bfd9 FW |
1790 | u32 offset = MPTCP_SKB_CB(skb)->offset; |
1791 | u32 data_len = skb->len - offset; | |
1792 | u32 count = min_t(size_t, len - copied, data_len); | |
1793 | int err; | |
1794 | ||
d976092c PA |
1795 | if (!(flags & MSG_TRUNC)) { |
1796 | err = skb_copy_datagram_msg(skb, offset, msg, count); | |
1797 | if (unlikely(err < 0)) { | |
1798 | if (!copied) | |
1799 | return err; | |
1800 | break; | |
1801 | } | |
6771bfd9 FW |
1802 | } |
1803 | ||
b7f653b2 FW |
1804 | if (MPTCP_SKB_CB(skb)->has_rxtstamp) { |
1805 | tcp_update_recv_tstamps(skb, tss); | |
1806 | *cmsg_flags |= MPTCP_CMSG_TS; | |
1807 | } | |
1808 | ||
6771bfd9 FW |
1809 | copied += count; |
1810 | ||
1811 | if (count < data_len) { | |
2c9e7765 | 1812 | if (!(flags & MSG_PEEK)) { |
ca4fb892 | 1813 | MPTCP_SKB_CB(skb)->offset += count; |
2c9e7765 FW |
1814 | MPTCP_SKB_CB(skb)->map_seq += count; |
1815 | } | |
6771bfd9 FW |
1816 | break; |
1817 | } | |
1818 | ||
ca4fb892 YL |
1819 | if (!(flags & MSG_PEEK)) { |
1820 | /* we will bulk release the skb memory later */ | |
1821 | skb->destructor = NULL; | |
ce599c51 | 1822 | WRITE_ONCE(msk->rmem_released, msk->rmem_released + skb->truesize); |
ca4fb892 YL |
1823 | __skb_unlink(skb, &msk->receive_queue); |
1824 | __kfree_skb(skb); | |
1825 | } | |
6771bfd9 FW |
1826 | |
1827 | if (copied >= len) | |
1828 | break; | |
1829 | } | |
1830 | ||
1831 | return copied; | |
1832 | } | |
1833 | ||
a6b118fe FW |
1834 | /* receive buffer autotuning. See tcp_rcv_space_adjust for more information. |
1835 | * | |
1836 | * Only difference: Use highest rtt estimate of the subflows in use. | |
1837 | */ | |
1838 | static void mptcp_rcv_space_adjust(struct mptcp_sock *msk, int copied) | |
1839 | { | |
1840 | struct mptcp_subflow_context *subflow; | |
1841 | struct sock *sk = (struct sock *)msk; | |
1842 | u32 time, advmss = 1; | |
1843 | u64 rtt_us, mstamp; | |
1844 | ||
1845 | sock_owned_by_me(sk); | |
1846 | ||
1847 | if (copied <= 0) | |
1848 | return; | |
1849 | ||
1850 | msk->rcvq_space.copied += copied; | |
1851 | ||
1852 | mstamp = div_u64(tcp_clock_ns(), NSEC_PER_USEC); | |
1853 | time = tcp_stamp_us_delta(mstamp, msk->rcvq_space.time); | |
1854 | ||
1855 | rtt_us = msk->rcvq_space.rtt_us; | |
1856 | if (rtt_us && time < (rtt_us >> 3)) | |
1857 | return; | |
1858 | ||
1859 | rtt_us = 0; | |
1860 | mptcp_for_each_subflow(msk, subflow) { | |
1861 | const struct tcp_sock *tp; | |
1862 | u64 sf_rtt_us; | |
1863 | u32 sf_advmss; | |
1864 | ||
1865 | tp = tcp_sk(mptcp_subflow_tcp_sock(subflow)); | |
1866 | ||
1867 | sf_rtt_us = READ_ONCE(tp->rcv_rtt_est.rtt_us); | |
1868 | sf_advmss = READ_ONCE(tp->advmss); | |
1869 | ||
1870 | rtt_us = max(sf_rtt_us, rtt_us); | |
1871 | advmss = max(sf_advmss, advmss); | |
1872 | } | |
1873 | ||
1874 | msk->rcvq_space.rtt_us = rtt_us; | |
1875 | if (time < (rtt_us >> 3) || rtt_us == 0) | |
1876 | return; | |
1877 | ||
1878 | if (msk->rcvq_space.copied <= msk->rcvq_space.space) | |
1879 | goto new_measure; | |
1880 | ||
1881 | if (sock_net(sk)->ipv4.sysctl_tcp_moderate_rcvbuf && | |
1882 | !(sk->sk_userlocks & SOCK_RCVBUF_LOCK)) { | |
1883 | int rcvmem, rcvbuf; | |
1884 | u64 rcvwin, grow; | |
1885 | ||
1886 | rcvwin = ((u64)msk->rcvq_space.copied << 1) + 16 * advmss; | |
1887 | ||
1888 | grow = rcvwin * (msk->rcvq_space.copied - msk->rcvq_space.space); | |
1889 | ||
1890 | do_div(grow, msk->rcvq_space.space); | |
1891 | rcvwin += (grow << 1); | |
1892 | ||
1893 | rcvmem = SKB_TRUESIZE(advmss + MAX_TCP_HEADER); | |
1894 | while (tcp_win_from_space(sk, rcvmem) < advmss) | |
1895 | rcvmem += 128; | |
1896 | ||
1897 | do_div(rcvwin, advmss); | |
1898 | rcvbuf = min_t(u64, rcvwin * rcvmem, | |
1899 | sock_net(sk)->ipv4.sysctl_tcp_rmem[2]); | |
1900 | ||
1901 | if (rcvbuf > sk->sk_rcvbuf) { | |
1902 | u32 window_clamp; | |
1903 | ||
1904 | window_clamp = tcp_win_from_space(sk, rcvbuf); | |
1905 | WRITE_ONCE(sk->sk_rcvbuf, rcvbuf); | |
1906 | ||
1907 | /* Make subflows follow along. If we do not do this, we | |
1908 | * get drops at subflow level if skbs can't be moved to | |
1909 | * the mptcp rx queue fast enough (announced rcv_win can | |
1910 | * exceed ssk->sk_rcvbuf). | |
1911 | */ | |
1912 | mptcp_for_each_subflow(msk, subflow) { | |
1913 | struct sock *ssk; | |
c76c6956 | 1914 | bool slow; |
a6b118fe FW |
1915 | |
1916 | ssk = mptcp_subflow_tcp_sock(subflow); | |
c76c6956 | 1917 | slow = lock_sock_fast(ssk); |
a6b118fe FW |
1918 | WRITE_ONCE(ssk->sk_rcvbuf, rcvbuf); |
1919 | tcp_sk(ssk)->window_clamp = window_clamp; | |
c76c6956 PA |
1920 | tcp_cleanup_rbuf(ssk, 1); |
1921 | unlock_sock_fast(ssk, slow); | |
a6b118fe FW |
1922 | } |
1923 | } | |
1924 | } | |
1925 | ||
1926 | msk->rcvq_space.space = msk->rcvq_space.copied; | |
1927 | new_measure: | |
1928 | msk->rcvq_space.copied = 0; | |
1929 | msk->rcvq_space.time = mstamp; | |
1930 | } | |
1931 | ||
87952603 PA |
1932 | static void __mptcp_update_rmem(struct sock *sk) |
1933 | { | |
1934 | struct mptcp_sock *msk = mptcp_sk(sk); | |
1935 | ||
1936 | if (!msk->rmem_released) | |
1937 | return; | |
1938 | ||
1939 | atomic_sub(msk->rmem_released, &sk->sk_rmem_alloc); | |
6511882c | 1940 | mptcp_rmem_uncharge(sk, msk->rmem_released); |
ce599c51 | 1941 | WRITE_ONCE(msk->rmem_released, 0); |
87952603 PA |
1942 | } |
1943 | ||
1944 | static void __mptcp_splice_receive_queue(struct sock *sk) | |
1945 | { | |
1946 | struct mptcp_sock *msk = mptcp_sk(sk); | |
1947 | ||
1948 | skb_queue_splice_tail_init(&sk->sk_receive_queue, &msk->receive_queue); | |
1949 | } | |
1950 | ||
e3859603 | 1951 | static bool __mptcp_move_skbs(struct mptcp_sock *msk) |
6771bfd9 | 1952 | { |
87952603 | 1953 | struct sock *sk = (struct sock *)msk; |
6771bfd9 | 1954 | unsigned int moved = 0; |
87952603 | 1955 | bool ret, done; |
d5f49190 | 1956 | |
78962489 | 1957 | mptcp_flush_join_list(msk); |
6771bfd9 FW |
1958 | do { |
1959 | struct sock *ssk = mptcp_subflow_recv_lookup(msk); | |
65f49fe7 | 1960 | bool slowpath; |
6771bfd9 | 1961 | |
87952603 PA |
1962 | /* we can have data pending in the subflows only if the msk |
1963 | * receive buffer was full at subflow_data_ready() time, | |
1964 | * that is an unlikely slow path. | |
1965 | */ | |
1966 | if (likely(!ssk)) | |
6771bfd9 FW |
1967 | break; |
1968 | ||
65f49fe7 | 1969 | slowpath = lock_sock_fast(ssk); |
87952603 | 1970 | mptcp_data_lock(sk); |
e3859603 | 1971 | __mptcp_update_rmem(sk); |
6771bfd9 | 1972 | done = __mptcp_move_skbs_from_subflow(msk, ssk, &moved); |
87952603 | 1973 | mptcp_data_unlock(sk); |
499ada50 PA |
1974 | |
1975 | if (unlikely(ssk->sk_err)) | |
1976 | __mptcp_error_report(sk); | |
65f49fe7 | 1977 | unlock_sock_fast(ssk, slowpath); |
6771bfd9 FW |
1978 | } while (!done); |
1979 | ||
87952603 PA |
1980 | /* acquire the data lock only if some input data is pending */ |
1981 | ret = moved > 0; | |
1982 | if (!RB_EMPTY_ROOT(&msk->out_of_order_queue) || | |
1983 | !skb_queue_empty_lockless(&sk->sk_receive_queue)) { | |
1984 | mptcp_data_lock(sk); | |
1985 | __mptcp_update_rmem(sk); | |
1986 | ret |= __mptcp_ofo_queue(msk); | |
1987 | __mptcp_splice_receive_queue(sk); | |
1988 | mptcp_data_unlock(sk); | |
ab174ad8 | 1989 | } |
87952603 PA |
1990 | if (ret) |
1991 | mptcp_check_data_fin((struct sock *)msk); | |
1992 | return !skb_queue_empty(&msk->receive_queue); | |
6771bfd9 FW |
1993 | } |
1994 | ||
2c9e7765 FW |
1995 | static unsigned int mptcp_inq_hint(const struct sock *sk) |
1996 | { | |
1997 | const struct mptcp_sock *msk = mptcp_sk(sk); | |
1998 | const struct sk_buff *skb; | |
1999 | ||
2000 | skb = skb_peek(&msk->receive_queue); | |
2001 | if (skb) { | |
2002 | u64 hint_val = msk->ack_seq - MPTCP_SKB_CB(skb)->map_seq; | |
2003 | ||
2004 | if (hint_val >= INT_MAX) | |
2005 | return INT_MAX; | |
2006 | ||
2007 | return (unsigned int)hint_val; | |
2008 | } | |
2009 | ||
2010 | if (sk->sk_state == TCP_CLOSE || (sk->sk_shutdown & RCV_SHUTDOWN)) | |
2011 | return 1; | |
2012 | ||
2013 | return 0; | |
2014 | } | |
2015 | ||
f870fa0b MM |
2016 | static int mptcp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, |
2017 | int nonblock, int flags, int *addr_len) | |
2018 | { | |
2019 | struct mptcp_sock *msk = mptcp_sk(sk); | |
b7f653b2 FW |
2020 | struct scm_timestamping_internal tss; |
2021 | int copied = 0, cmsg_flags = 0; | |
7a6a6cbc PA |
2022 | int target; |
2023 | long timeo; | |
f870fa0b | 2024 | |
cb9d80f4 PA |
2025 | /* MSG_ERRQUEUE is really a no-op till we support IP_RECVERR */ |
2026 | if (unlikely(flags & MSG_ERRQUEUE)) | |
2027 | return inet_recv_error(sk, msg, len, addr_len); | |
2028 | ||
6511882c | 2029 | lock_sock(sk); |
fd897679 PA |
2030 | if (unlikely(sk->sk_state == TCP_LISTEN)) { |
2031 | copied = -ENOTCONN; | |
2032 | goto out_err; | |
2033 | } | |
2034 | ||
7a6a6cbc PA |
2035 | timeo = sock_rcvtimeo(sk, nonblock); |
2036 | ||
2037 | len = min_t(size_t, len, INT_MAX); | |
2038 | target = sock_rcvlowat(sk, flags & MSG_WAITALL, len); | |
2039 | ||
2c9e7765 FW |
2040 | if (unlikely(msk->recvmsg_inq)) |
2041 | cmsg_flags = MPTCP_CMSG_INQ; | |
2042 | ||
05e3ecea | 2043 | while (copied < len) { |
e3859603 | 2044 | int bytes_read; |
7a6a6cbc | 2045 | |
b7f653b2 | 2046 | bytes_read = __mptcp_recvmsg_mskq(msk, msg, len - copied, flags, &tss, &cmsg_flags); |
6771bfd9 FW |
2047 | if (unlikely(bytes_read < 0)) { |
2048 | if (!copied) | |
2049 | copied = bytes_read; | |
2050 | goto out_err; | |
2051 | } | |
7a6a6cbc | 2052 | |
6771bfd9 | 2053 | copied += bytes_read; |
7a6a6cbc | 2054 | |
ea4ca586 | 2055 | /* be sure to advertise window change */ |
e3859603 PA |
2056 | mptcp_cleanup_rbuf(msk); |
2057 | ||
2058 | if (skb_queue_empty(&msk->receive_queue) && __mptcp_move_skbs(msk)) | |
2059 | continue; | |
ea4ca586 | 2060 | |
7a6a6cbc PA |
2061 | /* only the master socket status is relevant here. The exit |
2062 | * conditions mirror closely tcp_recvmsg() | |
2063 | */ | |
2064 | if (copied >= target) | |
2065 | break; | |
2066 | ||
2067 | if (copied) { | |
2068 | if (sk->sk_err || | |
2069 | sk->sk_state == TCP_CLOSE || | |
2070 | (sk->sk_shutdown & RCV_SHUTDOWN) || | |
2071 | !timeo || | |
2072 | signal_pending(current)) | |
2073 | break; | |
2074 | } else { | |
2075 | if (sk->sk_err) { | |
2076 | copied = sock_error(sk); | |
2077 | break; | |
2078 | } | |
2079 | ||
5969856a PA |
2080 | if (test_and_clear_bit(MPTCP_WORK_EOF, &msk->flags)) |
2081 | mptcp_check_for_eof(msk); | |
2082 | ||
87952603 PA |
2083 | if (sk->sk_shutdown & RCV_SHUTDOWN) { |
2084 | /* race breaker: the shutdown could be after the | |
2085 | * previous receive queue check | |
2086 | */ | |
e3859603 | 2087 | if (__mptcp_move_skbs(msk)) |
87952603 | 2088 | continue; |
7a6a6cbc | 2089 | break; |
87952603 | 2090 | } |
7a6a6cbc PA |
2091 | |
2092 | if (sk->sk_state == TCP_CLOSE) { | |
2093 | copied = -ENOTCONN; | |
2094 | break; | |
2095 | } | |
2096 | ||
2097 | if (!timeo) { | |
2098 | copied = -EAGAIN; | |
2099 | break; | |
2100 | } | |
2101 | ||
2102 | if (signal_pending(current)) { | |
2103 | copied = sock_intr_errno(timeo); | |
2104 | break; | |
2105 | } | |
2106 | } | |
2107 | ||
2108 | pr_debug("block timeout %ld", timeo); | |
612f71d7 | 2109 | sk_wait_data(sk, &timeo, NULL); |
7a6a6cbc | 2110 | } |
3c90e377 | 2111 | |
6771bfd9 | 2112 | out_err: |
b7f653b2 FW |
2113 | if (cmsg_flags && copied >= 0) { |
2114 | if (cmsg_flags & MPTCP_CMSG_TS) | |
2115 | tcp_recv_timestamp(msg, sk, &tss); | |
2c9e7765 FW |
2116 | |
2117 | if (cmsg_flags & MPTCP_CMSG_INQ) { | |
2118 | unsigned int inq = mptcp_inq_hint(sk); | |
2119 | ||
2120 | put_cmsg(msg, SOL_TCP, TCP_CM_INQ, sizeof(inq), &inq); | |
2121 | } | |
b7f653b2 FW |
2122 | } |
2123 | ||
612f71d7 PA |
2124 | pr_debug("msk=%p rx queue empty=%d:%d copied=%d", |
2125 | msk, skb_queue_empty_lockless(&sk->sk_receive_queue), | |
2126 | skb_queue_empty(&msk->receive_queue), copied); | |
ca4fb892 YL |
2127 | if (!(flags & MSG_PEEK)) |
2128 | mptcp_rcv_space_adjust(msk, copied); | |
a6b118fe | 2129 | |
7a6a6cbc | 2130 | release_sock(sk); |
cec37a6e PK |
2131 | return copied; |
2132 | } | |
2133 | ||
b51f9b80 PA |
2134 | static void mptcp_retransmit_timer(struct timer_list *t) |
2135 | { | |
2136 | struct inet_connection_sock *icsk = from_timer(icsk, t, | |
2137 | icsk_retransmit_timer); | |
2138 | struct sock *sk = &icsk->icsk_inet.sk; | |
2d6f5a2b | 2139 | struct mptcp_sock *msk = mptcp_sk(sk); |
b51f9b80 PA |
2140 | |
2141 | bh_lock_sock(sk); | |
2142 | if (!sock_owned_by_user(sk)) { | |
2d6f5a2b PA |
2143 | /* we need a process context to retransmit */ |
2144 | if (!test_and_set_bit(MPTCP_WORK_RTX, &msk->flags)) | |
2145 | mptcp_schedule_work(sk); | |
b51f9b80 PA |
2146 | } else { |
2147 | /* delegate our work to tcp_release_cb() */ | |
2d6f5a2b | 2148 | set_bit(MPTCP_RETRANSMIT, &msk->flags); |
b51f9b80 PA |
2149 | } |
2150 | bh_unlock_sock(sk); | |
2151 | sock_put(sk); | |
2152 | } | |
2153 | ||
e16163b6 PA |
2154 | static void mptcp_timeout_timer(struct timer_list *t) |
2155 | { | |
2156 | struct sock *sk = from_timer(sk, t, sk_timer); | |
2157 | ||
2158 | mptcp_schedule_work(sk); | |
b6d69fc8 | 2159 | sock_put(sk); |
e16163b6 PA |
2160 | } |
2161 | ||
3b1d6210 PA |
2162 | /* Find an idle subflow. Return NULL if there is unacked data at tcp |
2163 | * level. | |
2164 | * | |
2165 | * A backup subflow is returned only if that is the only kind available. | |
2166 | */ | |
ff5a0b42 | 2167 | static struct sock *mptcp_subflow_get_retrans(struct mptcp_sock *msk) |
3b1d6210 | 2168 | { |
71b7dec2 | 2169 | struct sock *backup = NULL, *pick = NULL; |
3b1d6210 | 2170 | struct mptcp_subflow_context *subflow; |
71b7dec2 | 2171 | int min_stale_count = INT_MAX; |
3b1d6210 PA |
2172 | |
2173 | sock_owned_by_me((const struct sock *)msk); | |
2174 | ||
d5f49190 | 2175 | if (__mptcp_check_fallback(msk)) |
d9ca1de8 | 2176 | return NULL; |
d5f49190 | 2177 | |
3b1d6210 PA |
2178 | mptcp_for_each_subflow(msk, subflow) { |
2179 | struct sock *ssk = mptcp_subflow_tcp_sock(subflow); | |
2180 | ||
ff5a0b42 | 2181 | if (!__mptcp_subflow_active(subflow)) |
d5f49190 PA |
2182 | continue; |
2183 | ||
71b7dec2 PA |
2184 | /* still data outstanding at TCP level? skip this */ |
2185 | if (!tcp_rtx_and_write_queues_empty(ssk)) { | |
2186 | mptcp_pm_subflow_chk_stale(msk, ssk); | |
2187 | min_stale_count = min_t(int, min_stale_count, subflow->stale_count); | |
2188 | continue; | |
860975c6 | 2189 | } |
3b1d6210 PA |
2190 | |
2191 | if (subflow->backup) { | |
2192 | if (!backup) | |
2193 | backup = ssk; | |
2194 | continue; | |
2195 | } | |
2196 | ||
71b7dec2 PA |
2197 | if (!pick) |
2198 | pick = ssk; | |
3b1d6210 PA |
2199 | } |
2200 | ||
71b7dec2 PA |
2201 | if (pick) |
2202 | return pick; | |
2203 | ||
2204 | /* use backup only if there are no progresses anywhere */ | |
2205 | return min_stale_count > 1 ? backup : NULL; | |
3b1d6210 PA |
2206 | } |
2207 | ||
17aee05d FW |
2208 | static void mptcp_dispose_initial_subflow(struct mptcp_sock *msk) |
2209 | { | |
2210 | if (msk->subflow) { | |
2211 | iput(SOCK_INODE(msk->subflow)); | |
2212 | msk->subflow = NULL; | |
2213 | } | |
2214 | } | |
2215 | ||
1e1d9d6f PA |
2216 | bool __mptcp_retransmit_pending_data(struct sock *sk) |
2217 | { | |
2218 | struct mptcp_data_frag *cur, *rtx_head; | |
2219 | struct mptcp_sock *msk = mptcp_sk(sk); | |
2220 | ||
2221 | if (__mptcp_check_fallback(mptcp_sk(sk))) | |
2222 | return false; | |
2223 | ||
2224 | if (tcp_rtx_and_write_queues_empty(sk)) | |
2225 | return false; | |
2226 | ||
2227 | /* the closing socket has some data untransmitted and/or unacked: | |
2228 | * some data in the mptcp rtx queue has not really xmitted yet. | |
2229 | * keep it simple and re-inject the whole mptcp level rtx queue | |
2230 | */ | |
2231 | mptcp_data_lock(sk); | |
2232 | __mptcp_clean_una_wakeup(sk); | |
2233 | rtx_head = mptcp_rtx_head(sk); | |
2234 | if (!rtx_head) { | |
2235 | mptcp_data_unlock(sk); | |
2236 | return false; | |
2237 | } | |
2238 | ||
0d199e43 | 2239 | msk->recovery_snd_nxt = msk->snd_nxt; |
1e1d9d6f PA |
2240 | msk->recovery = true; |
2241 | mptcp_data_unlock(sk); | |
2242 | ||
2243 | msk->first_pending = rtx_head; | |
1e1d9d6f PA |
2244 | msk->snd_burst = 0; |
2245 | ||
2246 | /* be sure to clear the "sent status" on all re-injected fragments */ | |
2247 | list_for_each_entry(cur, &msk->rtx_queue, list) { | |
2248 | if (!cur->already_sent) | |
2249 | break; | |
2250 | cur->already_sent = 0; | |
2251 | } | |
2252 | ||
2253 | return true; | |
2254 | } | |
2255 | ||
b29fcfb5 PA |
2256 | /* flags for __mptcp_close_ssk() */ |
2257 | #define MPTCP_CF_PUSH BIT(1) | |
2258 | #define MPTCP_CF_FASTCLOSE BIT(2) | |
2259 | ||
cec37a6e PK |
2260 | /* subflow sockets can be either outgoing (connect) or incoming |
2261 | * (accept). | |
2262 | * | |
2263 | * Outgoing subflows use in-kernel sockets. | |
2264 | * Incoming subflows do not have their own 'struct socket' allocated, | |
2265 | * so we need to use tcp_close() after detaching them from the mptcp | |
2266 | * parent socket. | |
2267 | */ | |
a141e02e | 2268 | static void __mptcp_close_ssk(struct sock *sk, struct sock *ssk, |
b29fcfb5 PA |
2269 | struct mptcp_subflow_context *subflow, |
2270 | unsigned int flags) | |
cec37a6e | 2271 | { |
e0be4931 | 2272 | struct mptcp_sock *msk = mptcp_sk(sk); |
b29fcfb5 | 2273 | bool need_push, dispose_it; |
e0be4931 | 2274 | |
b29fcfb5 PA |
2275 | dispose_it = !msk->subflow || ssk != msk->subflow->sk; |
2276 | if (dispose_it) | |
2277 | list_del(&subflow->node); | |
cec37a6e | 2278 | |
3f8b2667 | 2279 | lock_sock_nested(ssk, SINGLE_DEPTH_NESTING); |
e16163b6 | 2280 | |
b29fcfb5 PA |
2281 | if (flags & MPTCP_CF_FASTCLOSE) |
2282 | subflow->send_fastclose = 1; | |
2283 | ||
2284 | need_push = (flags & MPTCP_CF_PUSH) && __mptcp_retransmit_pending_data(sk); | |
2285 | if (!dispose_it) { | |
2286 | tcp_disconnect(ssk, 0); | |
2287 | msk->subflow->state = SS_UNCONNECTED; | |
2288 | mptcp_subflow_ctx_reset(subflow); | |
2289 | release_sock(ssk); | |
2290 | ||
2291 | goto out; | |
2292 | } | |
2293 | ||
e16163b6 PA |
2294 | /* if we are invoked by the msk cleanup code, the subflow is |
2295 | * already orphaned | |
2296 | */ | |
866f26f2 | 2297 | if (ssk->sk_socket) |
e16163b6 | 2298 | sock_orphan(ssk); |
e16163b6 | 2299 | |
d7b1bfd0 PA |
2300 | subflow->disposable = 1; |
2301 | ||
e16163b6 PA |
2302 | /* if ssk hit tcp_done(), tcp_cleanup_ulp() cleared the related ops |
2303 | * the ssk has been already destroyed, we just need to release the | |
2304 | * reference owned by msk; | |
2305 | */ | |
2306 | if (!inet_csk(ssk)->icsk_ulp_ops) { | |
2307 | kfree_rcu(subflow, rcu); | |
cec37a6e | 2308 | } else { |
d7b1bfd0 | 2309 | /* otherwise tcp will dispose of the ssk and subflow ctx */ |
e16163b6 PA |
2310 | __tcp_close(ssk, 0); |
2311 | ||
2312 | /* close acquired an extra ref */ | |
2313 | __sock_put(ssk); | |
cec37a6e | 2314 | } |
e16163b6 | 2315 | release_sock(ssk); |
e16163b6 PA |
2316 | |
2317 | sock_put(ssk); | |
e0be4931 | 2318 | |
c8fe62f0 FW |
2319 | if (ssk == msk->first) |
2320 | msk->first = NULL; | |
2321 | ||
b29fcfb5 PA |
2322 | out: |
2323 | if (ssk == msk->last_snd) | |
2324 | msk->last_snd = NULL; | |
1e1d9d6f PA |
2325 | |
2326 | if (need_push) | |
2327 | __mptcp_push_pending(sk, 0); | |
f870fa0b MM |
2328 | } |
2329 | ||
a141e02e FW |
2330 | void mptcp_close_ssk(struct sock *sk, struct sock *ssk, |
2331 | struct mptcp_subflow_context *subflow) | |
2332 | { | |
b911c97c FW |
2333 | if (sk->sk_state == TCP_ESTABLISHED) |
2334 | mptcp_event(MPTCP_EVENT_SUB_CLOSED, mptcp_sk(sk), ssk, GFP_KERNEL); | |
b29fcfb5 | 2335 | __mptcp_close_ssk(sk, ssk, subflow, MPTCP_CF_PUSH); |
a141e02e FW |
2336 | } |
2337 | ||
dc24f8b4 PA |
2338 | static unsigned int mptcp_sync_mss(struct sock *sk, u32 pmtu) |
2339 | { | |
2340 | return 0; | |
2341 | } | |
2342 | ||
0e4f35d7 PA |
2343 | static void __mptcp_close_subflow(struct mptcp_sock *msk) |
2344 | { | |
2345 | struct mptcp_subflow_context *subflow, *tmp; | |
2346 | ||
3abc05d9 FW |
2347 | might_sleep(); |
2348 | ||
0e4f35d7 PA |
2349 | list_for_each_entry_safe(subflow, tmp, &msk->conn_list, node) { |
2350 | struct sock *ssk = mptcp_subflow_tcp_sock(subflow); | |
2351 | ||
2352 | if (inet_sk_state_load(ssk) != TCP_CLOSE) | |
2353 | continue; | |
2354 | ||
40947e13 FW |
2355 | /* 'subflow_data_ready' will re-sched once rx queue is empty */ |
2356 | if (!skb_queue_empty_lockless(&ssk->sk_receive_queue)) | |
2357 | continue; | |
2358 | ||
a141e02e | 2359 | mptcp_close_ssk((struct sock *)msk, ssk, subflow); |
0e4f35d7 PA |
2360 | } |
2361 | } | |
2362 | ||
e16163b6 PA |
2363 | static bool mptcp_check_close_timeout(const struct sock *sk) |
2364 | { | |
2365 | s32 delta = tcp_jiffies32 - inet_csk(sk)->icsk_mtup.probe_timestamp; | |
2366 | struct mptcp_subflow_context *subflow; | |
2367 | ||
2368 | if (delta >= TCP_TIMEWAIT_LEN) | |
2369 | return true; | |
2370 | ||
2371 | /* if all subflows are in closed status don't bother with additional | |
2372 | * timeout | |
2373 | */ | |
2374 | mptcp_for_each_subflow(mptcp_sk(sk), subflow) { | |
2375 | if (inet_sk_state_load(mptcp_subflow_tcp_sock(subflow)) != | |
2376 | TCP_CLOSE) | |
2377 | return false; | |
2378 | } | |
2379 | return true; | |
2380 | } | |
2381 | ||
50c504a2 FW |
2382 | static void mptcp_check_fastclose(struct mptcp_sock *msk) |
2383 | { | |
2384 | struct mptcp_subflow_context *subflow, *tmp; | |
2385 | struct sock *sk = &msk->sk.icsk_inet.sk; | |
2386 | ||
2387 | if (likely(!READ_ONCE(msk->rcv_fastclose))) | |
2388 | return; | |
2389 | ||
2390 | mptcp_token_destroy(msk); | |
2391 | ||
2392 | list_for_each_entry_safe(subflow, tmp, &msk->conn_list, node) { | |
2393 | struct sock *tcp_sk = mptcp_subflow_tcp_sock(subflow); | |
75e908c3 | 2394 | bool slow; |
50c504a2 | 2395 | |
75e908c3 | 2396 | slow = lock_sock_fast(tcp_sk); |
50c504a2 FW |
2397 | if (tcp_sk->sk_state != TCP_CLOSE) { |
2398 | tcp_send_active_reset(tcp_sk, GFP_ATOMIC); | |
2399 | tcp_set_state(tcp_sk, TCP_CLOSE); | |
2400 | } | |
75e908c3 | 2401 | unlock_sock_fast(tcp_sk, slow); |
50c504a2 FW |
2402 | } |
2403 | ||
2404 | inet_sk_state_store(sk, TCP_CLOSE); | |
2405 | sk->sk_shutdown = SHUTDOWN_MASK; | |
2406 | smp_mb__before_atomic(); /* SHUTDOWN must be visible first */ | |
50c504a2 FW |
2407 | set_bit(MPTCP_WORK_CLOSE_SUBFLOW, &msk->flags); |
2408 | ||
2409 | mptcp_close_wake_up(sk); | |
2410 | } | |
2411 | ||
2948d0a1 | 2412 | static void __mptcp_retrans(struct sock *sk) |
80992017 | 2413 | { |
2948d0a1 | 2414 | struct mptcp_sock *msk = mptcp_sk(sk); |
caf971df | 2415 | struct mptcp_sendmsg_info info = {}; |
3b1d6210 | 2416 | struct mptcp_data_frag *dfrag; |
3b1d6210 | 2417 | size_t copied = 0; |
2948d0a1 PA |
2418 | struct sock *ssk; |
2419 | int ret; | |
3b1d6210 | 2420 | |
b5941f06 | 2421 | mptcp_clean_una_wakeup(sk); |
3241a9c0 FW |
2422 | |
2423 | /* first check ssk: need to kick "stale" logic */ | |
2424 | ssk = mptcp_subflow_get_retrans(msk); | |
3b1d6210 | 2425 | dfrag = mptcp_rtx_head(sk); |
6477dd39 MM |
2426 | if (!dfrag) { |
2427 | if (mptcp_data_fin_enabled(msk)) { | |
2428 | struct inet_connection_sock *icsk = inet_csk(sk); | |
2429 | ||
2430 | icsk->icsk_retransmits++; | |
2431 | mptcp_set_datafin_timeout(sk); | |
2432 | mptcp_send_ack(msk); | |
2433 | ||
2434 | goto reset_timer; | |
2435 | } | |
2436 | ||
3241a9c0 FW |
2437 | if (!mptcp_send_head(sk)) |
2438 | return; | |
2439 | ||
2440 | goto reset_timer; | |
6477dd39 | 2441 | } |
3b1d6210 | 2442 | |
3b1d6210 | 2443 | if (!ssk) |
2948d0a1 | 2444 | goto reset_timer; |
3b1d6210 PA |
2445 | |
2446 | lock_sock(ssk); | |
2447 | ||
d9ca1de8 PA |
2448 | /* limit retransmission to the bytes already sent on some subflows */ |
2449 | info.sent = 0; | |
4e14867d PA |
2450 | info.limit = READ_ONCE(msk->csum_enabled) ? dfrag->data_len : dfrag->already_sent; |
2451 | while (info.sent < info.limit) { | |
d9ca1de8 | 2452 | ret = mptcp_sendmsg_frag(sk, ssk, dfrag, &info); |
6f8a612a | 2453 | if (ret <= 0) |
3b1d6210 PA |
2454 | break; |
2455 | ||
fc518953 | 2456 | MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_RETRANSSEGS); |
3b1d6210 | 2457 | copied += ret; |
d9ca1de8 | 2458 | info.sent += ret; |
3b1d6210 | 2459 | } |
4e14867d PA |
2460 | if (copied) { |
2461 | dfrag->already_sent = max(dfrag->already_sent, info.sent); | |
caf971df PA |
2462 | tcp_push(ssk, 0, info.mss_now, tcp_sk(ssk)->nonagle, |
2463 | info.size_goal); | |
4e14867d | 2464 | } |
3b1d6210 | 2465 | |
3b1d6210 PA |
2466 | release_sock(ssk); |
2467 | ||
2948d0a1 | 2468 | reset_timer: |
3241a9c0 FW |
2469 | mptcp_check_and_set_pending(sk); |
2470 | ||
3b1d6210 PA |
2471 | if (!mptcp_timer_pending(sk)) |
2472 | mptcp_reset_timer(sk); | |
2948d0a1 PA |
2473 | } |
2474 | ||
2475 | static void mptcp_worker(struct work_struct *work) | |
2476 | { | |
2477 | struct mptcp_sock *msk = container_of(work, struct mptcp_sock, work); | |
2478 | struct sock *sk = &msk->sk.icsk_inet.sk; | |
2479 | int state; | |
2480 | ||
2481 | lock_sock(sk); | |
2482 | state = sk->sk_state; | |
2483 | if (unlikely(state == TCP_CLOSE)) | |
2484 | goto unlock; | |
2485 | ||
2486 | mptcp_check_data_fin_ack(sk); | |
78962489 | 2487 | mptcp_flush_join_list(msk); |
2948d0a1 PA |
2488 | |
2489 | mptcp_check_fastclose(msk); | |
2490 | ||
2491 | if (msk->pm.status) | |
2492 | mptcp_pm_nl_work(msk); | |
2493 | ||
2494 | if (test_and_clear_bit(MPTCP_WORK_EOF, &msk->flags)) | |
2495 | mptcp_check_for_eof(msk); | |
2496 | ||
2497 | __mptcp_check_send_data_fin(sk); | |
2498 | mptcp_check_data_fin(sk); | |
2499 | ||
2500 | /* There is no point in keeping around an orphaned sk timedout or | |
2501 | * closed, but we need the msk around to reply to incoming DATA_FIN, | |
2502 | * even if it is orphaned and in FIN_WAIT2 state | |
2503 | */ | |
2504 | if (sock_flag(sk, SOCK_DEAD) && | |
2505 | (mptcp_check_close_timeout(sk) || sk->sk_state == TCP_CLOSE)) { | |
2506 | inet_sk_state_store(sk, TCP_CLOSE); | |
2507 | __mptcp_destroy_sock(sk); | |
2508 | goto unlock; | |
2509 | } | |
2510 | ||
2511 | if (test_and_clear_bit(MPTCP_WORK_CLOSE_SUBFLOW, &msk->flags)) | |
2512 | __mptcp_close_subflow(msk); | |
2513 | ||
2514 | if (test_and_clear_bit(MPTCP_WORK_RTX, &msk->flags)) | |
2515 | __mptcp_retrans(sk); | |
3b1d6210 PA |
2516 | |
2517 | unlock: | |
80992017 PA |
2518 | release_sock(sk); |
2519 | sock_put(sk); | |
2520 | } | |
2521 | ||
784325e9 | 2522 | static int __mptcp_init_sock(struct sock *sk) |
f870fa0b | 2523 | { |
cec37a6e PK |
2524 | struct mptcp_sock *msk = mptcp_sk(sk); |
2525 | ||
ec3edaa7 PK |
2526 | spin_lock_init(&msk->join_list_lock); |
2527 | ||
cec37a6e | 2528 | INIT_LIST_HEAD(&msk->conn_list); |
ec3edaa7 | 2529 | INIT_LIST_HEAD(&msk->join_list); |
18b683bf | 2530 | INIT_LIST_HEAD(&msk->rtx_queue); |
80992017 | 2531 | INIT_WORK(&msk->work, mptcp_worker); |
87952603 | 2532 | __skb_queue_head_init(&msk->receive_queue); |
ab174ad8 | 2533 | msk->out_of_order_queue = RB_ROOT; |
f0e6a4cf | 2534 | msk->first_pending = NULL; |
6511882c | 2535 | msk->rmem_fwd_alloc = 0; |
ce599c51 | 2536 | WRITE_ONCE(msk->rmem_released, 0); |
33d41c9c | 2537 | msk->timer_ival = TCP_RTO_MIN; |
cec37a6e | 2538 | |
8ab183de | 2539 | msk->first = NULL; |
dc24f8b4 | 2540 | inet_csk(sk)->icsk_sync_mss = mptcp_sync_mss; |
752e9067 | 2541 | WRITE_ONCE(msk->csum_enabled, mptcp_is_checksum_enabled(sock_net(sk))); |
1e1d9d6f | 2542 | msk->recovery = false; |
8ab183de | 2543 | |
1b1c7a0e PK |
2544 | mptcp_pm_data_init(msk); |
2545 | ||
b51f9b80 PA |
2546 | /* re-use the csk retrans timer for MPTCP-level retrans */ |
2547 | timer_setup(&msk->sk.icsk_retransmit_timer, mptcp_retransmit_timer, 0); | |
e16163b6 | 2548 | timer_setup(&sk->sk_timer, mptcp_timeout_timer, 0); |
aa1fbd94 | 2549 | |
f870fa0b MM |
2550 | return 0; |
2551 | } | |
2552 | ||
b29fcfb5 | 2553 | static void mptcp_ca_reset(struct sock *sk) |
784325e9 | 2554 | { |
20b5759f | 2555 | struct inet_connection_sock *icsk = inet_csk(sk); |
b29fcfb5 PA |
2556 | |
2557 | tcp_assign_congestion_control(sk); | |
2558 | strcpy(mptcp_sk(sk)->ca_name, icsk->icsk_ca_ops->name); | |
2559 | ||
2560 | /* no need to keep a reference to the ops, the name will suffice */ | |
2561 | tcp_cleanup_congestion_control(sk); | |
2562 | icsk->icsk_ca_ops = NULL; | |
2563 | } | |
2564 | ||
2565 | static int mptcp_init_sock(struct sock *sk) | |
2566 | { | |
fc518953 FW |
2567 | struct net *net = sock_net(sk); |
2568 | int ret; | |
18b683bf | 2569 | |
b6c08380 GT |
2570 | ret = __mptcp_init_sock(sk); |
2571 | if (ret) | |
2572 | return ret; | |
2573 | ||
fc518953 FW |
2574 | if (!mptcp_is_enabled(net)) |
2575 | return -ENOPROTOOPT; | |
2576 | ||
2577 | if (unlikely(!net->mib.mptcp_statistics) && !mptcp_mib_alloc(net)) | |
2578 | return -ENOMEM; | |
2579 | ||
fa68018d PA |
2580 | ret = __mptcp_socket_create(mptcp_sk(sk)); |
2581 | if (ret) | |
2582 | return ret; | |
2583 | ||
20b5759f PA |
2584 | /* fetch the ca name; do it outside __mptcp_init_sock(), so that clone will |
2585 | * propagate the correct value | |
2586 | */ | |
b29fcfb5 | 2587 | mptcp_ca_reset(sk); |
20b5759f | 2588 | |
d027236c | 2589 | sk_sockets_allocated_inc(sk); |
a6b118fe | 2590 | sk->sk_rcvbuf = sock_net(sk)->ipv4.sysctl_tcp_rmem[1]; |
da51aef5 | 2591 | sk->sk_sndbuf = sock_net(sk)->ipv4.sysctl_tcp_wmem[1]; |
d027236c | 2592 | |
18b683bf PA |
2593 | return 0; |
2594 | } | |
2595 | ||
2596 | static void __mptcp_clear_xmit(struct sock *sk) | |
2597 | { | |
2598 | struct mptcp_sock *msk = mptcp_sk(sk); | |
2599 | struct mptcp_data_frag *dtmp, *dfrag; | |
2600 | ||
d9ca1de8 | 2601 | WRITE_ONCE(msk->first_pending, NULL); |
18b683bf | 2602 | list_for_each_entry_safe(dfrag, dtmp, &msk->rtx_queue, list) |
d027236c | 2603 | dfrag_clear(sk, dfrag); |
784325e9 MB |
2604 | } |
2605 | ||
80992017 PA |
2606 | static void mptcp_cancel_work(struct sock *sk) |
2607 | { | |
2608 | struct mptcp_sock *msk = mptcp_sk(sk); | |
2609 | ||
b2771d24 | 2610 | if (cancel_work_sync(&msk->work)) |
e16163b6 | 2611 | __sock_put(sk); |
80992017 PA |
2612 | } |
2613 | ||
d0876b22 | 2614 | void mptcp_subflow_shutdown(struct sock *sk, struct sock *ssk, int how) |
21498490 PK |
2615 | { |
2616 | lock_sock(ssk); | |
2617 | ||
2618 | switch (ssk->sk_state) { | |
2619 | case TCP_LISTEN: | |
2620 | if (!(how & RCV_SHUTDOWN)) | |
2621 | break; | |
df561f66 | 2622 | fallthrough; |
21498490 PK |
2623 | case TCP_SYN_SENT: |
2624 | tcp_disconnect(ssk, O_NONBLOCK); | |
2625 | break; | |
2626 | default: | |
43b54c6e MM |
2627 | if (__mptcp_check_fallback(mptcp_sk(sk))) { |
2628 | pr_debug("Fallback"); | |
2629 | ssk->sk_shutdown |= how; | |
2630 | tcp_shutdown(ssk, how); | |
2631 | } else { | |
2632 | pr_debug("Sending DATA_FIN on subflow %p", ssk); | |
43b54c6e | 2633 | tcp_send_ack(ssk); |
6477dd39 MM |
2634 | if (!mptcp_timer_pending(sk)) |
2635 | mptcp_reset_timer(sk); | |
43b54c6e | 2636 | } |
21498490 PK |
2637 | break; |
2638 | } | |
2639 | ||
21498490 PK |
2640 | release_sock(ssk); |
2641 | } | |
2642 | ||
6920b851 MM |
2643 | static const unsigned char new_state[16] = { |
2644 | /* current state: new state: action: */ | |
2645 | [0 /* (Invalid) */] = TCP_CLOSE, | |
2646 | [TCP_ESTABLISHED] = TCP_FIN_WAIT1 | TCP_ACTION_FIN, | |
2647 | [TCP_SYN_SENT] = TCP_CLOSE, | |
2648 | [TCP_SYN_RECV] = TCP_FIN_WAIT1 | TCP_ACTION_FIN, | |
2649 | [TCP_FIN_WAIT1] = TCP_FIN_WAIT1, | |
2650 | [TCP_FIN_WAIT2] = TCP_FIN_WAIT2, | |
2651 | [TCP_TIME_WAIT] = TCP_CLOSE, /* should not happen ! */ | |
2652 | [TCP_CLOSE] = TCP_CLOSE, | |
2653 | [TCP_CLOSE_WAIT] = TCP_LAST_ACK | TCP_ACTION_FIN, | |
2654 | [TCP_LAST_ACK] = TCP_LAST_ACK, | |
2655 | [TCP_LISTEN] = TCP_CLOSE, | |
2656 | [TCP_CLOSING] = TCP_CLOSING, | |
2657 | [TCP_NEW_SYN_RECV] = TCP_CLOSE, /* should not happen ! */ | |
2658 | }; | |
2659 | ||
2660 | static int mptcp_close_state(struct sock *sk) | |
2661 | { | |
2662 | int next = (int)new_state[sk->sk_state]; | |
2663 | int ns = next & TCP_STATE_MASK; | |
2664 | ||
2665 | inet_sk_state_store(sk, ns); | |
2666 | ||
2667 | return next & TCP_ACTION_FIN; | |
2668 | } | |
2669 | ||
e16163b6 | 2670 | static void __mptcp_check_send_data_fin(struct sock *sk) |
f870fa0b | 2671 | { |
e16163b6 | 2672 | struct mptcp_subflow_context *subflow; |
f870fa0b MM |
2673 | struct mptcp_sock *msk = mptcp_sk(sk); |
2674 | ||
e16163b6 PA |
2675 | pr_debug("msk=%p snd_data_fin_enable=%d pending=%d snd_nxt=%llu write_seq=%llu", |
2676 | msk, msk->snd_data_fin_enable, !!mptcp_send_head(sk), | |
2677 | msk->snd_nxt, msk->write_seq); | |
43b54c6e | 2678 | |
e16163b6 PA |
2679 | /* we still need to enqueue subflows or not really shutting down, |
2680 | * skip this | |
2681 | */ | |
2682 | if (!msk->snd_data_fin_enable || msk->snd_nxt + 1 != msk->write_seq || | |
2683 | mptcp_send_head(sk)) | |
2684 | return; | |
2685 | ||
2686 | WRITE_ONCE(msk->snd_nxt, msk->write_seq); | |
2687 | ||
26aa2314 PA |
2688 | /* fallback socket will not get data_fin/ack, can move to the next |
2689 | * state now | |
2690 | */ | |
2691 | if (__mptcp_check_fallback(msk)) { | |
58cd405b | 2692 | WRITE_ONCE(msk->snd_una, msk->write_seq); |
26aa2314 PA |
2693 | if ((1 << sk->sk_state) & (TCPF_CLOSING | TCPF_LAST_ACK)) { |
2694 | inet_sk_state_store(sk, TCP_CLOSE); | |
2695 | mptcp_close_wake_up(sk); | |
2696 | } else if (sk->sk_state == TCP_FIN_WAIT1) { | |
2697 | inet_sk_state_store(sk, TCP_FIN_WAIT2); | |
2698 | } | |
43b54c6e MM |
2699 | } |
2700 | ||
78962489 | 2701 | mptcp_flush_join_list(msk); |
e16163b6 PA |
2702 | mptcp_for_each_subflow(msk, subflow) { |
2703 | struct sock *tcp_sk = mptcp_subflow_tcp_sock(subflow); | |
43b54c6e | 2704 | |
e16163b6 | 2705 | mptcp_subflow_shutdown(sk, tcp_sk, SEND_SHUTDOWN); |
43b54c6e | 2706 | } |
e16163b6 | 2707 | } |
2c22c06c | 2708 | |
e16163b6 PA |
2709 | static void __mptcp_wr_shutdown(struct sock *sk) |
2710 | { | |
2711 | struct mptcp_sock *msk = mptcp_sk(sk); | |
43b54c6e | 2712 | |
e16163b6 PA |
2713 | pr_debug("msk=%p snd_data_fin_enable=%d shutdown=%x state=%d pending=%d", |
2714 | msk, msk->snd_data_fin_enable, sk->sk_shutdown, sk->sk_state, | |
2715 | !!mptcp_send_head(sk)); | |
2716 | ||
2717 | /* will be ignored by fallback sockets */ | |
2718 | WRITE_ONCE(msk->write_seq, msk->write_seq + 1); | |
2719 | WRITE_ONCE(msk->snd_data_fin_enable, 1); | |
2720 | ||
2721 | __mptcp_check_send_data_fin(sk); | |
2722 | } | |
2723 | ||
2724 | static void __mptcp_destroy_sock(struct sock *sk) | |
2725 | { | |
2726 | struct mptcp_subflow_context *subflow, *tmp; | |
2727 | struct mptcp_sock *msk = mptcp_sk(sk); | |
2728 | LIST_HEAD(conn_list); | |
2729 | ||
2730 | pr_debug("msk=%p", msk); | |
f870fa0b | 2731 | |
3abc05d9 FW |
2732 | might_sleep(); |
2733 | ||
10f6d46c PA |
2734 | /* be sure to always acquire the join list lock, to sync vs |
2735 | * mptcp_finish_join(). | |
2736 | */ | |
2737 | spin_lock_bh(&msk->join_list_lock); | |
2738 | list_splice_tail_init(&msk->join_list, &msk->conn_list); | |
2739 | spin_unlock_bh(&msk->join_list_lock); | |
b2c5b614 FW |
2740 | list_splice_init(&msk->conn_list, &conn_list); |
2741 | ||
6e628cd3 | 2742 | sk_stop_timer(sk, &msk->sk.icsk_retransmit_timer); |
e16163b6 PA |
2743 | sk_stop_timer(sk, &sk->sk_timer); |
2744 | msk->pm.status = 0; | |
b2c5b614 | 2745 | |
b29fcfb5 PA |
2746 | /* clears msk->subflow, allowing the following loop to close |
2747 | * even the initial subflow | |
2748 | */ | |
2749 | mptcp_dispose_initial_subflow(msk); | |
b2c5b614 | 2750 | list_for_each_entry_safe(subflow, tmp, &conn_list, node) { |
cec37a6e | 2751 | struct sock *ssk = mptcp_subflow_tcp_sock(subflow); |
b29fcfb5 | 2752 | __mptcp_close_ssk(sk, ssk, subflow, 0); |
f870fa0b MM |
2753 | } |
2754 | ||
e16163b6 | 2755 | sk->sk_prot->destroy(sk); |
80992017 | 2756 | |
6511882c | 2757 | WARN_ON_ONCE(msk->rmem_fwd_alloc); |
87952603 | 2758 | WARN_ON_ONCE(msk->rmem_released); |
e16163b6 PA |
2759 | sk_stream_kill_queues(sk); |
2760 | xfrm_sk_free_policy(sk); | |
aa1fbd94 | 2761 | |
e16163b6 PA |
2762 | sk_refcnt_debug_release(sk); |
2763 | sock_put(sk); | |
2764 | } | |
2765 | ||
2766 | static void mptcp_close(struct sock *sk, long timeout) | |
2767 | { | |
2768 | struct mptcp_subflow_context *subflow; | |
2769 | bool do_cancel_work = false; | |
2770 | ||
2771 | lock_sock(sk); | |
2772 | sk->sk_shutdown = SHUTDOWN_MASK; | |
2773 | ||
2774 | if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) { | |
2775 | inet_sk_state_store(sk, TCP_CLOSE); | |
2776 | goto cleanup; | |
2777 | } | |
6771bfd9 | 2778 | |
e16163b6 PA |
2779 | if (mptcp_close_state(sk)) |
2780 | __mptcp_wr_shutdown(sk); | |
2781 | ||
2782 | sk_stream_wait_close(sk, timeout); | |
2783 | ||
2784 | cleanup: | |
2785 | /* orphan all the subflows */ | |
2786 | inet_csk(sk)->icsk_mtup.probe_timestamp = tcp_jiffies32; | |
44227915 | 2787 | mptcp_for_each_subflow(mptcp_sk(sk), subflow) { |
e16163b6 | 2788 | struct sock *ssk = mptcp_subflow_tcp_sock(subflow); |
49054556 | 2789 | bool slow = lock_sock_fast_nested(ssk); |
e16163b6 | 2790 | |
e16163b6 PA |
2791 | sock_orphan(ssk); |
2792 | unlock_sock_fast(ssk, slow); | |
e16163b6 PA |
2793 | } |
2794 | sock_orphan(sk); | |
2795 | ||
2796 | sock_hold(sk); | |
2797 | pr_debug("msk=%p state=%d", sk, sk->sk_state); | |
b29fcfb5 PA |
2798 | if (mptcp_sk(sk)->token) |
2799 | mptcp_event(MPTCP_EVENT_CLOSED, mptcp_sk(sk), NULL, GFP_KERNEL); | |
2800 | ||
e16163b6 PA |
2801 | if (sk->sk_state == TCP_CLOSE) { |
2802 | __mptcp_destroy_sock(sk); | |
2803 | do_cancel_work = true; | |
2804 | } else { | |
2805 | sk_reset_timer(sk, &sk->sk_timer, jiffies + TCP_TIMEWAIT_LEN); | |
2806 | } | |
2807 | release_sock(sk); | |
2808 | if (do_cancel_work) | |
2809 | mptcp_cancel_work(sk); | |
b911c97c | 2810 | |
e16163b6 | 2811 | sock_put(sk); |
f870fa0b MM |
2812 | } |
2813 | ||
cf7da0d6 PK |
2814 | static void mptcp_copy_inaddrs(struct sock *msk, const struct sock *ssk) |
2815 | { | |
2816 | #if IS_ENABLED(CONFIG_MPTCP_IPV6) | |
2817 | const struct ipv6_pinfo *ssk6 = inet6_sk(ssk); | |
2818 | struct ipv6_pinfo *msk6 = inet6_sk(msk); | |
2819 | ||
2820 | msk->sk_v6_daddr = ssk->sk_v6_daddr; | |
2821 | msk->sk_v6_rcv_saddr = ssk->sk_v6_rcv_saddr; | |
2822 | ||
2823 | if (msk6 && ssk6) { | |
2824 | msk6->saddr = ssk6->saddr; | |
2825 | msk6->flow_label = ssk6->flow_label; | |
2826 | } | |
2827 | #endif | |
2828 | ||
2829 | inet_sk(msk)->inet_num = inet_sk(ssk)->inet_num; | |
2830 | inet_sk(msk)->inet_dport = inet_sk(ssk)->inet_dport; | |
2831 | inet_sk(msk)->inet_sport = inet_sk(ssk)->inet_sport; | |
2832 | inet_sk(msk)->inet_daddr = inet_sk(ssk)->inet_daddr; | |
2833 | inet_sk(msk)->inet_saddr = inet_sk(ssk)->inet_saddr; | |
2834 | inet_sk(msk)->inet_rcv_saddr = inet_sk(ssk)->inet_rcv_saddr; | |
2835 | } | |
2836 | ||
18b683bf PA |
2837 | static int mptcp_disconnect(struct sock *sk, int flags) |
2838 | { | |
76e2a55d PA |
2839 | struct mptcp_subflow_context *subflow; |
2840 | struct mptcp_sock *msk = mptcp_sk(sk); | |
2841 | ||
78962489 FW |
2842 | mptcp_do_flush_join_list(msk); |
2843 | ||
b29fcfb5 PA |
2844 | inet_sk_state_store(sk, TCP_CLOSE); |
2845 | ||
13a9499e PA |
2846 | mptcp_for_each_subflow(msk, subflow) { |
2847 | struct sock *ssk = mptcp_subflow_tcp_sock(subflow); | |
2848 | ||
b29fcfb5 | 2849 | __mptcp_close_ssk(sk, ssk, subflow, MPTCP_CF_FASTCLOSE); |
13a9499e | 2850 | } |
b29fcfb5 PA |
2851 | |
2852 | sk_stop_timer(sk, &msk->sk.icsk_retransmit_timer); | |
2853 | sk_stop_timer(sk, &sk->sk_timer); | |
2854 | ||
2855 | if (mptcp_sk(sk)->token) | |
2856 | mptcp_event(MPTCP_EVENT_CLOSED, mptcp_sk(sk), NULL, GFP_KERNEL); | |
2857 | ||
2858 | mptcp_destroy_common(msk); | |
2859 | msk->last_snd = NULL; | |
2860 | msk->flags = 0; | |
2861 | msk->recovery = false; | |
2862 | msk->can_ack = false; | |
2863 | msk->fully_established = false; | |
2864 | msk->rcv_data_fin = false; | |
2865 | msk->snd_data_fin_enable = false; | |
2866 | msk->rcv_fastclose = false; | |
2867 | msk->use_64bit_ack = false; | |
2868 | WRITE_ONCE(msk->csum_enabled, mptcp_is_checksum_enabled(sock_net(sk))); | |
2869 | mptcp_pm_data_reset(msk); | |
2870 | mptcp_ca_reset(sk); | |
2871 | ||
2872 | sk->sk_shutdown = 0; | |
2873 | sk_error_report(sk); | |
42c556fe | 2874 | return 0; |
18b683bf PA |
2875 | } |
2876 | ||
b0519de8 FW |
2877 | #if IS_ENABLED(CONFIG_MPTCP_IPV6) |
2878 | static struct ipv6_pinfo *mptcp_inet6_sk(const struct sock *sk) | |
2879 | { | |
2880 | unsigned int offset = sizeof(struct mptcp6_sock) - sizeof(struct ipv6_pinfo); | |
2881 | ||
2882 | return (struct ipv6_pinfo *)(((u8 *)sk) + offset); | |
2883 | } | |
2884 | #endif | |
2885 | ||
fca5c82c | 2886 | struct sock *mptcp_sk_clone(const struct sock *sk, |
cfde141e | 2887 | const struct mptcp_options_received *mp_opt, |
fca5c82c | 2888 | struct request_sock *req) |
b0519de8 | 2889 | { |
58b09919 | 2890 | struct mptcp_subflow_request_sock *subflow_req = mptcp_subflow_rsk(req); |
b0519de8 | 2891 | struct sock *nsk = sk_clone_lock(sk, GFP_ATOMIC); |
58b09919 PA |
2892 | struct mptcp_sock *msk; |
2893 | u64 ack_seq; | |
b0519de8 FW |
2894 | |
2895 | if (!nsk) | |
2896 | return NULL; | |
2897 | ||
2898 | #if IS_ENABLED(CONFIG_MPTCP_IPV6) | |
2899 | if (nsk->sk_family == AF_INET6) | |
2900 | inet_sk(nsk)->pinet6 = mptcp_inet6_sk(nsk); | |
2901 | #endif | |
2902 | ||
58b09919 PA |
2903 | __mptcp_init_sock(nsk); |
2904 | ||
2905 | msk = mptcp_sk(nsk); | |
2906 | msk->local_key = subflow_req->local_key; | |
2907 | msk->token = subflow_req->token; | |
2908 | msk->subflow = NULL; | |
b93df08c | 2909 | WRITE_ONCE(msk->fully_established, false); |
74c7dfbe | 2910 | if (mp_opt->suboptions & OPTION_MPTCP_CSUMREQD) |
06251181 | 2911 | WRITE_ONCE(msk->csum_enabled, true); |
58b09919 | 2912 | |
58b09919 | 2913 | msk->write_seq = subflow_req->idsn + 1; |
eaa2ffab | 2914 | msk->snd_nxt = msk->write_seq; |
7439d687 PA |
2915 | msk->snd_una = msk->write_seq; |
2916 | msk->wnd_end = msk->snd_nxt + req->rsk_rcv_wnd; | |
df00b087 | 2917 | msk->setsockopt_seq = mptcp_sk(sk)->setsockopt_seq; |
6f8a612a | 2918 | |
74c7dfbe | 2919 | if (mp_opt->suboptions & OPTIONS_MPTCP_MPC) { |
58b09919 | 2920 | msk->can_ack = true; |
cfde141e | 2921 | msk->remote_key = mp_opt->sndr_key; |
58b09919 PA |
2922 | mptcp_crypto_key_sha(msk->remote_key, NULL, &ack_seq); |
2923 | ack_seq++; | |
917944da | 2924 | WRITE_ONCE(msk->ack_seq, ack_seq); |
fa3fe2b1 | 2925 | WRITE_ONCE(msk->rcv_wnd_sent, ack_seq); |
58b09919 | 2926 | } |
7f20d5fc | 2927 | |
5e20087d | 2928 | sock_reset_flag(nsk, SOCK_RCU_FREE); |
7f20d5fc PA |
2929 | /* will be fully established after successful MPC subflow creation */ |
2930 | inet_sk_state_store(nsk, TCP_SYN_RECV); | |
0c148460 PA |
2931 | |
2932 | security_inet_csk_clone(nsk, req); | |
58b09919 PA |
2933 | bh_unlock_sock(nsk); |
2934 | ||
2935 | /* keep a single reference */ | |
2936 | __sock_put(nsk); | |
b0519de8 FW |
2937 | return nsk; |
2938 | } | |
2939 | ||
a6b118fe FW |
2940 | void mptcp_rcv_space_init(struct mptcp_sock *msk, const struct sock *ssk) |
2941 | { | |
2942 | const struct tcp_sock *tp = tcp_sk(ssk); | |
2943 | ||
2944 | msk->rcvq_space.copied = 0; | |
2945 | msk->rcvq_space.rtt_us = 0; | |
2946 | ||
2947 | msk->rcvq_space.time = tp->tcp_mstamp; | |
2948 | ||
2949 | /* initial rcv_space offering made to peer */ | |
2950 | msk->rcvq_space.space = min_t(u32, tp->rcv_wnd, | |
2951 | TCP_INIT_CWND * tp->advmss); | |
2952 | if (msk->rcvq_space.space == 0) | |
2953 | msk->rcvq_space.space = TCP_INIT_CWND * TCP_MSS_DEFAULT; | |
6f8a612a | 2954 | |
7439d687 | 2955 | WRITE_ONCE(msk->wnd_end, msk->snd_nxt + tcp_sk(ssk)->snd_wnd); |
a6b118fe FW |
2956 | } |
2957 | ||
cf7da0d6 PK |
2958 | static struct sock *mptcp_accept(struct sock *sk, int flags, int *err, |
2959 | bool kern) | |
2960 | { | |
2961 | struct mptcp_sock *msk = mptcp_sk(sk); | |
2962 | struct socket *listener; | |
2963 | struct sock *newsk; | |
2964 | ||
2965 | listener = __mptcp_nmpc_socket(msk); | |
2966 | if (WARN_ON_ONCE(!listener)) { | |
2967 | *err = -EINVAL; | |
2968 | return NULL; | |
2969 | } | |
2970 | ||
2971 | pr_debug("msk=%p, listener=%p", msk, mptcp_subflow_ctx(listener->sk)); | |
2972 | newsk = inet_csk_accept(listener->sk, flags, err, kern); | |
2973 | if (!newsk) | |
2974 | return NULL; | |
2975 | ||
2976 | pr_debug("msk=%p, subflow is mptcp=%d", msk, sk_is_mptcp(newsk)); | |
cf7da0d6 PK |
2977 | if (sk_is_mptcp(newsk)) { |
2978 | struct mptcp_subflow_context *subflow; | |
2979 | struct sock *new_mptcp_sock; | |
cf7da0d6 PK |
2980 | |
2981 | subflow = mptcp_subflow_ctx(newsk); | |
58b09919 | 2982 | new_mptcp_sock = subflow->conn; |
cf7da0d6 | 2983 | |
58b09919 PA |
2984 | /* is_mptcp should be false if subflow->conn is missing, see |
2985 | * subflow_syn_recv_sock() | |
2986 | */ | |
2987 | if (WARN_ON_ONCE(!new_mptcp_sock)) { | |
2988 | tcp_sk(newsk)->is_mptcp = 0; | |
d6692b3b | 2989 | goto out; |
cf7da0d6 PK |
2990 | } |
2991 | ||
58b09919 PA |
2992 | /* acquire the 2nd reference for the owning socket */ |
2993 | sock_hold(new_mptcp_sock); | |
cf7da0d6 | 2994 | newsk = new_mptcp_sock; |
0397c6d8 | 2995 | MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_MPCAPABLEPASSIVEACK); |
fc518953 FW |
2996 | } else { |
2997 | MPTCP_INC_STATS(sock_net(sk), | |
2998 | MPTCP_MIB_MPCAPABLEPASSIVEFALLBACK); | |
cf7da0d6 PK |
2999 | } |
3000 | ||
d6692b3b FW |
3001 | out: |
3002 | newsk->sk_kern_sock = kern; | |
cf7da0d6 PK |
3003 | return newsk; |
3004 | } | |
3005 | ||
5c8c1640 GT |
3006 | void mptcp_destroy_common(struct mptcp_sock *msk) |
3007 | { | |
87952603 PA |
3008 | struct sock *sk = (struct sock *)msk; |
3009 | ||
6e628cd3 PA |
3010 | __mptcp_clear_xmit(sk); |
3011 | ||
87952603 | 3012 | /* move to sk_receive_queue, sk_stream_kill_queues will purge it */ |
b29fcfb5 | 3013 | mptcp_data_lock(sk); |
87952603 | 3014 | skb_queue_splice_tail_init(&msk->receive_queue, &sk->sk_receive_queue); |
6511882c | 3015 | __skb_queue_purge(&sk->sk_receive_queue); |
5c8c1640 | 3016 | skb_rbtree_purge(&msk->out_of_order_queue); |
b29fcfb5 | 3017 | mptcp_data_unlock(sk); |
6511882c PA |
3018 | |
3019 | /* move all the rx fwd alloc into the sk_mem_reclaim_final in | |
3020 | * inet_sock_destruct() will dispose it | |
3021 | */ | |
3022 | sk->sk_forward_alloc += msk->rmem_fwd_alloc; | |
3023 | msk->rmem_fwd_alloc = 0; | |
5c8c1640 GT |
3024 | mptcp_token_destroy(msk); |
3025 | mptcp_pm_free_anno_list(msk); | |
3026 | } | |
3027 | ||
79c0949e PK |
3028 | static void mptcp_destroy(struct sock *sk) |
3029 | { | |
c9fd9c5f FW |
3030 | struct mptcp_sock *msk = mptcp_sk(sk); |
3031 | ||
5c8c1640 | 3032 | mptcp_destroy_common(msk); |
d027236c | 3033 | sk_sockets_allocated_dec(sk); |
79c0949e PK |
3034 | } |
3035 | ||
6e628cd3 PA |
3036 | void __mptcp_data_acked(struct sock *sk) |
3037 | { | |
3038 | if (!sock_owned_by_user(sk)) | |
3039 | __mptcp_clean_una(sk); | |
3040 | else | |
3041 | set_bit(MPTCP_CLEAN_UNA, &mptcp_sk(sk)->flags); | |
3042 | ||
3043 | if (mptcp_pending_data_fin_ack(sk)) | |
3044 | mptcp_schedule_work(sk); | |
3045 | } | |
3046 | ||
219d0499 | 3047 | void __mptcp_check_push(struct sock *sk, struct sock *ssk) |
6e628cd3 PA |
3048 | { |
3049 | if (!mptcp_send_head(sk)) | |
3050 | return; | |
3051 | ||
40dc9416 | 3052 | if (!sock_owned_by_user(sk)) { |
b19bc294 PA |
3053 | struct sock *xmit_ssk = mptcp_subflow_get_send(mptcp_sk(sk)); |
3054 | ||
3055 | if (xmit_ssk == ssk) | |
40dc9416 | 3056 | __mptcp_subflow_push_pending(sk, ssk); |
b19bc294 | 3057 | else if (xmit_ssk) |
bcd97734 | 3058 | mptcp_subflow_delegate(mptcp_subflow_ctx(xmit_ssk), MPTCP_DELEGATE_SEND); |
40dc9416 | 3059 | } else { |
6e628cd3 | 3060 | set_bit(MPTCP_PUSH_PENDING, &mptcp_sk(sk)->flags); |
40dc9416 | 3061 | } |
6e628cd3 PA |
3062 | } |
3063 | ||
e93da928 | 3064 | /* processes deferred events and flush wmem */ |
14c441b5 PA |
3065 | static void mptcp_release_cb(struct sock *sk) |
3066 | { | |
c2e6048f | 3067 | for (;;) { |
2d6f5a2b PA |
3068 | unsigned long flags = 0; |
3069 | ||
c2e6048f | 3070 | if (test_and_clear_bit(MPTCP_PUSH_PENDING, &mptcp_sk(sk)->flags)) |
2e5de7e0 | 3071 | flags |= BIT(MPTCP_PUSH_PENDING); |
2d6f5a2b PA |
3072 | if (test_and_clear_bit(MPTCP_RETRANSMIT, &mptcp_sk(sk)->flags)) |
3073 | flags |= BIT(MPTCP_RETRANSMIT); | |
c2e6048f PA |
3074 | if (!flags) |
3075 | break; | |
3076 | ||
3077 | /* the following actions acquire the subflow socket lock | |
6e628cd3 PA |
3078 | * |
3079 | * 1) can't be invoked in atomic scope | |
3080 | * 2) must avoid ABBA deadlock with msk socket spinlock: the RX | |
3081 | * datapath acquires the msk socket spinlock while helding | |
3082 | * the subflow socket lock | |
3083 | */ | |
3084 | ||
3085 | spin_unlock_bh(&sk->sk_lock.slock); | |
2e5de7e0 | 3086 | if (flags & BIT(MPTCP_PUSH_PENDING)) |
c2e6048f | 3087 | __mptcp_push_pending(sk, 0); |
2d6f5a2b PA |
3088 | if (flags & BIT(MPTCP_RETRANSMIT)) |
3089 | __mptcp_retrans(sk); | |
c2e6048f PA |
3090 | |
3091 | cond_resched(); | |
6e628cd3 PA |
3092 | spin_lock_bh(&sk->sk_lock.slock); |
3093 | } | |
c2e6048f | 3094 | |
490274b4 PA |
3095 | /* be sure to set the current sk state before tacking actions |
3096 | * depending on sk_state | |
3097 | */ | |
3098 | if (test_and_clear_bit(MPTCP_CONNECTED, &mptcp_sk(sk)->flags)) | |
3099 | __mptcp_set_connected(sk); | |
c2e6048f | 3100 | if (test_and_clear_bit(MPTCP_CLEAN_UNA, &mptcp_sk(sk)->flags)) |
417789df | 3101 | __mptcp_clean_una_wakeup(sk); |
15cc1045 PA |
3102 | if (test_and_clear_bit(MPTCP_ERROR_REPORT, &mptcp_sk(sk)->flags)) |
3103 | __mptcp_error_report(sk); | |
6e628cd3 | 3104 | |
87952603 | 3105 | __mptcp_update_rmem(sk); |
14c441b5 PA |
3106 | } |
3107 | ||
bcd97734 PA |
3108 | /* MP_JOIN client subflow must wait for 4th ack before sending any data: |
3109 | * TCP can't schedule delack timer before the subflow is fully established. | |
3110 | * MPTCP uses the delack timer to do 3rd ack retransmissions | |
3111 | */ | |
3112 | static void schedule_3rdack_retransmission(struct sock *ssk) | |
3113 | { | |
3114 | struct inet_connection_sock *icsk = inet_csk(ssk); | |
3115 | struct tcp_sock *tp = tcp_sk(ssk); | |
3116 | unsigned long timeout; | |
3117 | ||
3118 | if (mptcp_subflow_ctx(ssk)->fully_established) | |
3119 | return; | |
3120 | ||
3121 | /* reschedule with a timeout above RTT, as we must look only for drop */ | |
3122 | if (tp->srtt_us) | |
3123 | timeout = usecs_to_jiffies(tp->srtt_us >> (3 - 1)); | |
3124 | else | |
3125 | timeout = TCP_TIMEOUT_INIT; | |
3126 | timeout += jiffies; | |
3127 | ||
3128 | WARN_ON_ONCE(icsk->icsk_ack.pending & ICSK_ACK_TIMER); | |
3129 | icsk->icsk_ack.pending |= ICSK_ACK_SCHED | ICSK_ACK_TIMER; | |
3130 | icsk->icsk_ack.timeout = timeout; | |
3131 | sk_reset_timer(ssk, &icsk->icsk_delack_timer, timeout); | |
3132 | } | |
3133 | ||
b19bc294 PA |
3134 | void mptcp_subflow_process_delegated(struct sock *ssk) |
3135 | { | |
3136 | struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); | |
3137 | struct sock *sk = subflow->conn; | |
3138 | ||
bcd97734 PA |
3139 | if (test_bit(MPTCP_DELEGATE_SEND, &subflow->delegated_status)) { |
3140 | mptcp_data_lock(sk); | |
3141 | if (!sock_owned_by_user(sk)) | |
3142 | __mptcp_subflow_push_pending(sk, ssk); | |
3143 | else | |
3144 | set_bit(MPTCP_PUSH_PENDING, &mptcp_sk(sk)->flags); | |
3145 | mptcp_data_unlock(sk); | |
3146 | mptcp_subflow_delegated_done(subflow, MPTCP_DELEGATE_SEND); | |
3147 | } | |
3148 | if (test_bit(MPTCP_DELEGATE_ACK, &subflow->delegated_status)) { | |
3149 | schedule_3rdack_retransmission(ssk); | |
3150 | mptcp_subflow_delegated_done(subflow, MPTCP_DELEGATE_ACK); | |
3151 | } | |
b19bc294 PA |
3152 | } |
3153 | ||
2c5ebd00 PA |
3154 | static int mptcp_hash(struct sock *sk) |
3155 | { | |
3156 | /* should never be called, | |
3157 | * we hash the TCP subflows not the master socket | |
3158 | */ | |
3159 | WARN_ON_ONCE(1); | |
3160 | return 0; | |
3161 | } | |
3162 | ||
3163 | static void mptcp_unhash(struct sock *sk) | |
3164 | { | |
3165 | /* called from sk_common_release(), but nothing to do here */ | |
3166 | } | |
3167 | ||
cec37a6e | 3168 | static int mptcp_get_port(struct sock *sk, unsigned short snum) |
f870fa0b MM |
3169 | { |
3170 | struct mptcp_sock *msk = mptcp_sk(sk); | |
cec37a6e | 3171 | struct socket *ssock; |
f870fa0b | 3172 | |
cec37a6e PK |
3173 | ssock = __mptcp_nmpc_socket(msk); |
3174 | pr_debug("msk=%p, subflow=%p", msk, ssock); | |
3175 | if (WARN_ON_ONCE(!ssock)) | |
3176 | return -EINVAL; | |
f870fa0b | 3177 | |
cec37a6e PK |
3178 | return inet_csk_get_port(ssock->sk, snum); |
3179 | } | |
f870fa0b | 3180 | |
cec37a6e PK |
3181 | void mptcp_finish_connect(struct sock *ssk) |
3182 | { | |
3183 | struct mptcp_subflow_context *subflow; | |
3184 | struct mptcp_sock *msk; | |
3185 | struct sock *sk; | |
6d0060f6 | 3186 | u64 ack_seq; |
f870fa0b | 3187 | |
cec37a6e | 3188 | subflow = mptcp_subflow_ctx(ssk); |
cec37a6e PK |
3189 | sk = subflow->conn; |
3190 | msk = mptcp_sk(sk); | |
3191 | ||
648ef4b8 MM |
3192 | pr_debug("msk=%p, token=%u", sk, subflow->token); |
3193 | ||
6d0060f6 MM |
3194 | mptcp_crypto_key_sha(subflow->remote_key, NULL, &ack_seq); |
3195 | ack_seq++; | |
648ef4b8 MM |
3196 | subflow->map_seq = ack_seq; |
3197 | subflow->map_subflow_seq = 1; | |
6d0060f6 | 3198 | |
cec37a6e PK |
3199 | /* the socket is not connected yet, no msk/subflow ops can access/race |
3200 | * accessing the field below | |
3201 | */ | |
3202 | WRITE_ONCE(msk->remote_key, subflow->remote_key); | |
3203 | WRITE_ONCE(msk->local_key, subflow->local_key); | |
6d0060f6 | 3204 | WRITE_ONCE(msk->write_seq, subflow->idsn + 1); |
eaa2ffab | 3205 | WRITE_ONCE(msk->snd_nxt, msk->write_seq); |
6d0060f6 | 3206 | WRITE_ONCE(msk->ack_seq, ack_seq); |
fa3fe2b1 | 3207 | WRITE_ONCE(msk->rcv_wnd_sent, ack_seq); |
d22f4988 | 3208 | WRITE_ONCE(msk->can_ack, 1); |
7439d687 | 3209 | WRITE_ONCE(msk->snd_una, msk->write_seq); |
1b1c7a0e | 3210 | |
6c714f1b | 3211 | mptcp_pm_new_connection(msk, ssk, 0); |
a6b118fe FW |
3212 | |
3213 | mptcp_rcv_space_init(msk, ssk); | |
f870fa0b MM |
3214 | } |
3215 | ||
866f26f2 | 3216 | void mptcp_sock_graft(struct sock *sk, struct socket *parent) |
cf7da0d6 PK |
3217 | { |
3218 | write_lock_bh(&sk->sk_callback_lock); | |
3219 | rcu_assign_pointer(sk->sk_wq, &parent->wq); | |
3220 | sk_set_socket(sk, parent); | |
3221 | sk->sk_uid = SOCK_INODE(parent)->i_uid; | |
3222 | write_unlock_bh(&sk->sk_callback_lock); | |
3223 | } | |
3224 | ||
e16163b6 | 3225 | bool mptcp_finish_join(struct sock *ssk) |
f296234c | 3226 | { |
e16163b6 | 3227 | struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); |
f296234c PK |
3228 | struct mptcp_sock *msk = mptcp_sk(subflow->conn); |
3229 | struct sock *parent = (void *)msk; | |
3230 | struct socket *parent_sock; | |
ec3edaa7 | 3231 | bool ret; |
f296234c PK |
3232 | |
3233 | pr_debug("msk=%p, subflow=%p", msk, subflow); | |
3234 | ||
3235 | /* mptcp socket already closing? */ | |
dc87efdb FW |
3236 | if (!mptcp_is_fully_established(parent)) { |
3237 | subflow->reset_reason = MPTCP_RST_EMPTCP; | |
f296234c | 3238 | return false; |
dc87efdb | 3239 | } |
f296234c PK |
3240 | |
3241 | if (!msk->pm.server_side) | |
b911c97c | 3242 | goto out; |
f296234c | 3243 | |
dc87efdb FW |
3244 | if (!mptcp_pm_allow_new_subflow(msk)) { |
3245 | subflow->reset_reason = MPTCP_RST_EPROHIBIT; | |
10f6d46c | 3246 | return false; |
dc87efdb | 3247 | } |
10f6d46c PA |
3248 | |
3249 | /* active connections are already on conn_list, and we can't acquire | |
3250 | * msk lock here. | |
3251 | * use the join list lock as synchronization point and double-check | |
e16163b6 | 3252 | * msk status to avoid racing with __mptcp_destroy_sock() |
10f6d46c PA |
3253 | */ |
3254 | spin_lock_bh(&msk->join_list_lock); | |
3255 | ret = inet_sk_state_load(parent) == TCP_ESTABLISHED; | |
e16163b6 | 3256 | if (ret && !WARN_ON_ONCE(!list_empty(&subflow->node))) { |
10f6d46c | 3257 | list_add_tail(&subflow->node, &msk->join_list); |
e16163b6 PA |
3258 | sock_hold(ssk); |
3259 | } | |
10f6d46c | 3260 | spin_unlock_bh(&msk->join_list_lock); |
dc87efdb FW |
3261 | if (!ret) { |
3262 | subflow->reset_reason = MPTCP_RST_EPROHIBIT; | |
10f6d46c | 3263 | return false; |
dc87efdb | 3264 | } |
10f6d46c PA |
3265 | |
3266 | /* attach to msk socket only after we are sure he will deal with us | |
3267 | * at close time | |
3268 | */ | |
f296234c | 3269 | parent_sock = READ_ONCE(parent->sk_socket); |
e16163b6 PA |
3270 | if (parent_sock && !ssk->sk_socket) |
3271 | mptcp_sock_graft(ssk, parent_sock); | |
917944da | 3272 | subflow->map_seq = READ_ONCE(msk->ack_seq); |
b911c97c FW |
3273 | out: |
3274 | mptcp_event(MPTCP_EVENT_SUB_ESTABLISHED, msk, ssk, GFP_ATOMIC); | |
10f6d46c | 3275 | return true; |
f296234c PK |
3276 | } |
3277 | ||
76e2a55d PA |
3278 | static void mptcp_shutdown(struct sock *sk, int how) |
3279 | { | |
3280 | pr_debug("sk=%p, how=%d", sk, how); | |
3281 | ||
3282 | if ((how & SEND_SHUTDOWN) && mptcp_close_state(sk)) | |
3283 | __mptcp_wr_shutdown(sk); | |
3284 | } | |
3285 | ||
6511882c PA |
3286 | static int mptcp_forward_alloc_get(const struct sock *sk) |
3287 | { | |
3288 | return sk->sk_forward_alloc + mptcp_sk(sk)->rmem_fwd_alloc; | |
3289 | } | |
3290 | ||
644807e3 FW |
3291 | static int mptcp_ioctl_outq(const struct mptcp_sock *msk, u64 v) |
3292 | { | |
3293 | const struct sock *sk = (void *)msk; | |
3294 | u64 delta; | |
3295 | ||
3296 | if (sk->sk_state == TCP_LISTEN) | |
3297 | return -EINVAL; | |
3298 | ||
3299 | if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) | |
3300 | return 0; | |
3301 | ||
3302 | delta = msk->write_seq - v; | |
3303 | if (delta > INT_MAX) | |
3304 | delta = INT_MAX; | |
3305 | ||
3306 | return (int)delta; | |
3307 | } | |
3308 | ||
3309 | static int mptcp_ioctl(struct sock *sk, int cmd, unsigned long arg) | |
3310 | { | |
3311 | struct mptcp_sock *msk = mptcp_sk(sk); | |
3312 | bool slow; | |
3313 | int answ; | |
3314 | ||
3315 | switch (cmd) { | |
3316 | case SIOCINQ: | |
3317 | if (sk->sk_state == TCP_LISTEN) | |
3318 | return -EINVAL; | |
3319 | ||
3320 | lock_sock(sk); | |
3321 | __mptcp_move_skbs(msk); | |
3322 | answ = mptcp_inq_hint(sk); | |
3323 | release_sock(sk); | |
3324 | break; | |
3325 | case SIOCOUTQ: | |
3326 | slow = lock_sock_fast(sk); | |
3327 | answ = mptcp_ioctl_outq(msk, READ_ONCE(msk->snd_una)); | |
3328 | unlock_sock_fast(sk, slow); | |
3329 | break; | |
3330 | case SIOCOUTQNSD: | |
3331 | slow = lock_sock_fast(sk); | |
3332 | answ = mptcp_ioctl_outq(msk, msk->snd_nxt); | |
3333 | unlock_sock_fast(sk, slow); | |
3334 | break; | |
3335 | default: | |
3336 | return -ENOIOCTLCMD; | |
3337 | } | |
3338 | ||
3339 | return put_user(answ, (int __user *)arg); | |
3340 | } | |
3341 | ||
f870fa0b MM |
3342 | static struct proto mptcp_prot = { |
3343 | .name = "MPTCP", | |
3344 | .owner = THIS_MODULE, | |
3345 | .init = mptcp_init_sock, | |
18b683bf | 3346 | .disconnect = mptcp_disconnect, |
f870fa0b | 3347 | .close = mptcp_close, |
cf7da0d6 | 3348 | .accept = mptcp_accept, |
717e79c8 PK |
3349 | .setsockopt = mptcp_setsockopt, |
3350 | .getsockopt = mptcp_getsockopt, | |
76e2a55d | 3351 | .shutdown = mptcp_shutdown, |
79c0949e | 3352 | .destroy = mptcp_destroy, |
f870fa0b | 3353 | .sendmsg = mptcp_sendmsg, |
644807e3 | 3354 | .ioctl = mptcp_ioctl, |
f870fa0b | 3355 | .recvmsg = mptcp_recvmsg, |
14c441b5 | 3356 | .release_cb = mptcp_release_cb, |
2c5ebd00 PA |
3357 | .hash = mptcp_hash, |
3358 | .unhash = mptcp_unhash, | |
cec37a6e | 3359 | .get_port = mptcp_get_port, |
6511882c | 3360 | .forward_alloc_get = mptcp_forward_alloc_get, |
d027236c PA |
3361 | .sockets_allocated = &mptcp_sockets_allocated, |
3362 | .memory_allocated = &tcp_memory_allocated, | |
3363 | .memory_pressure = &tcp_memory_pressure, | |
d027236c | 3364 | .sysctl_wmem_offset = offsetof(struct net, ipv4.sysctl_tcp_wmem), |
989ef49b | 3365 | .sysctl_rmem_offset = offsetof(struct net, ipv4.sysctl_tcp_rmem), |
d027236c | 3366 | .sysctl_mem = sysctl_tcp_mem, |
f870fa0b | 3367 | .obj_size = sizeof(struct mptcp_sock), |
2c5ebd00 | 3368 | .slab_flags = SLAB_TYPESAFE_BY_RCU, |
f870fa0b MM |
3369 | .no_autobind = true, |
3370 | }; | |
3371 | ||
2303f994 PK |
3372 | static int mptcp_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) |
3373 | { | |
3374 | struct mptcp_sock *msk = mptcp_sk(sock->sk); | |
3375 | struct socket *ssock; | |
cf7da0d6 | 3376 | int err; |
2303f994 PK |
3377 | |
3378 | lock_sock(sock->sk); | |
fa68018d PA |
3379 | ssock = __mptcp_nmpc_socket(msk); |
3380 | if (!ssock) { | |
3381 | err = -EINVAL; | |
2303f994 PK |
3382 | goto unlock; |
3383 | } | |
3384 | ||
3385 | err = ssock->ops->bind(ssock, uaddr, addr_len); | |
cf7da0d6 PK |
3386 | if (!err) |
3387 | mptcp_copy_inaddrs(sock->sk, ssock->sk); | |
2303f994 PK |
3388 | |
3389 | unlock: | |
3390 | release_sock(sock->sk); | |
3391 | return err; | |
3392 | } | |
3393 | ||
0235d075 PA |
3394 | static void mptcp_subflow_early_fallback(struct mptcp_sock *msk, |
3395 | struct mptcp_subflow_context *subflow) | |
3396 | { | |
3397 | subflow->request_mptcp = 0; | |
3398 | __mptcp_do_fallback(msk); | |
3399 | } | |
3400 | ||
2303f994 PK |
3401 | static int mptcp_stream_connect(struct socket *sock, struct sockaddr *uaddr, |
3402 | int addr_len, int flags) | |
3403 | { | |
3404 | struct mptcp_sock *msk = mptcp_sk(sock->sk); | |
2c5ebd00 | 3405 | struct mptcp_subflow_context *subflow; |
2303f994 PK |
3406 | struct socket *ssock; |
3407 | int err; | |
3408 | ||
3409 | lock_sock(sock->sk); | |
41be81a8 PA |
3410 | if (sock->state != SS_UNCONNECTED && msk->subflow) { |
3411 | /* pending connection or invalid state, let existing subflow | |
3412 | * cope with that | |
3413 | */ | |
3414 | ssock = msk->subflow; | |
3415 | goto do_connect; | |
3416 | } | |
3417 | ||
fa68018d PA |
3418 | ssock = __mptcp_nmpc_socket(msk); |
3419 | if (!ssock) { | |
3420 | err = -EINVAL; | |
2303f994 PK |
3421 | goto unlock; |
3422 | } | |
3423 | ||
fa68018d PA |
3424 | mptcp_token_destroy(msk); |
3425 | inet_sk_state_store(sock->sk, TCP_SYN_SENT); | |
2c5ebd00 | 3426 | subflow = mptcp_subflow_ctx(ssock->sk); |
cf7da0d6 PK |
3427 | #ifdef CONFIG_TCP_MD5SIG |
3428 | /* no MPTCP if MD5SIG is enabled on this socket or we may run out of | |
3429 | * TCP option space. | |
3430 | */ | |
3431 | if (rcu_access_pointer(tcp_sk(ssock->sk)->md5sig_info)) | |
0235d075 | 3432 | mptcp_subflow_early_fallback(msk, subflow); |
cf7da0d6 | 3433 | #endif |
a16195e3 PA |
3434 | if (subflow->request_mptcp && mptcp_token_new_connect(ssock->sk)) { |
3435 | MPTCP_INC_STATS(sock_net(ssock->sk), MPTCP_MIB_TOKENFALLBACKINIT); | |
0235d075 | 3436 | mptcp_subflow_early_fallback(msk, subflow); |
a16195e3 | 3437 | } |
5695eb88 PA |
3438 | if (likely(!__mptcp_check_fallback(msk))) |
3439 | MPTCP_INC_STATS(sock_net(sock->sk), MPTCP_MIB_MPCAPABLEACTIVE); | |
cf7da0d6 | 3440 | |
41be81a8 | 3441 | do_connect: |
2303f994 | 3442 | err = ssock->ops->connect(ssock, uaddr, addr_len, flags); |
41be81a8 PA |
3443 | sock->state = ssock->state; |
3444 | ||
3445 | /* on successful connect, the msk state will be moved to established by | |
3446 | * subflow_finish_connect() | |
3447 | */ | |
367fe04e | 3448 | if (!err || err == -EINPROGRESS) |
41be81a8 PA |
3449 | mptcp_copy_inaddrs(sock->sk, ssock->sk); |
3450 | else | |
3451 | inet_sk_state_store(sock->sk, inet_sk_state_load(ssock->sk)); | |
2303f994 PK |
3452 | |
3453 | unlock: | |
3454 | release_sock(sock->sk); | |
3455 | return err; | |
3456 | } | |
3457 | ||
cf7da0d6 PK |
3458 | static int mptcp_listen(struct socket *sock, int backlog) |
3459 | { | |
3460 | struct mptcp_sock *msk = mptcp_sk(sock->sk); | |
3461 | struct socket *ssock; | |
3462 | int err; | |
3463 | ||
3464 | pr_debug("msk=%p", msk); | |
3465 | ||
3466 | lock_sock(sock->sk); | |
fa68018d PA |
3467 | ssock = __mptcp_nmpc_socket(msk); |
3468 | if (!ssock) { | |
3469 | err = -EINVAL; | |
cf7da0d6 PK |
3470 | goto unlock; |
3471 | } | |
3472 | ||
fa68018d PA |
3473 | mptcp_token_destroy(msk); |
3474 | inet_sk_state_store(sock->sk, TCP_LISTEN); | |
5e20087d FW |
3475 | sock_set_flag(sock->sk, SOCK_RCU_FREE); |
3476 | ||
cf7da0d6 PK |
3477 | err = ssock->ops->listen(ssock, backlog); |
3478 | inet_sk_state_store(sock->sk, inet_sk_state_load(ssock->sk)); | |
3479 | if (!err) | |
3480 | mptcp_copy_inaddrs(sock->sk, ssock->sk); | |
3481 | ||
3482 | unlock: | |
3483 | release_sock(sock->sk); | |
3484 | return err; | |
3485 | } | |
3486 | ||
cf7da0d6 PK |
3487 | static int mptcp_stream_accept(struct socket *sock, struct socket *newsock, |
3488 | int flags, bool kern) | |
3489 | { | |
3490 | struct mptcp_sock *msk = mptcp_sk(sock->sk); | |
3491 | struct socket *ssock; | |
3492 | int err; | |
3493 | ||
3494 | pr_debug("msk=%p", msk); | |
3495 | ||
cf7da0d6 PK |
3496 | ssock = __mptcp_nmpc_socket(msk); |
3497 | if (!ssock) | |
71ba088c | 3498 | return -EINVAL; |
cf7da0d6 PK |
3499 | |
3500 | err = ssock->ops->accept(sock, newsock, flags, kern); | |
d2f77c53 | 3501 | if (err == 0 && !mptcp_is_tcpsk(newsock->sk)) { |
cf7da0d6 PK |
3502 | struct mptcp_sock *msk = mptcp_sk(newsock->sk); |
3503 | struct mptcp_subflow_context *subflow; | |
0397c6d8 | 3504 | struct sock *newsk = newsock->sk; |
0397c6d8 | 3505 | |
4d54cc32 | 3506 | lock_sock(newsk); |
5b950ff4 PA |
3507 | |
3508 | /* PM/worker can now acquire the first subflow socket | |
3509 | * lock without racing with listener queue cleanup, | |
3510 | * we can notify it, if needed. | |
c8fe62f0 FW |
3511 | * |
3512 | * Even if remote has reset the initial subflow by now | |
3513 | * the refcnt is still at least one. | |
5b950ff4 PA |
3514 | */ |
3515 | subflow = mptcp_subflow_ctx(msk->first); | |
3516 | list_add(&subflow->node, &msk->conn_list); | |
3517 | sock_hold(msk->first); | |
3518 | if (mptcp_is_fully_established(newsk)) | |
6c714f1b | 3519 | mptcp_pm_fully_established(msk, msk->first, GFP_KERNEL); |
5b950ff4 | 3520 | |
0397c6d8 PA |
3521 | mptcp_copy_inaddrs(newsk, msk->first); |
3522 | mptcp_rcv_space_init(msk, msk->first); | |
5cf92bba | 3523 | mptcp_propagate_sndbuf(newsk, msk->first); |
cf7da0d6 PK |
3524 | |
3525 | /* set ssk->sk_socket of accept()ed flows to mptcp socket. | |
3526 | * This is needed so NOSPACE flag can be set from tcp stack. | |
3527 | */ | |
78962489 | 3528 | mptcp_flush_join_list(msk); |
190f8b06 | 3529 | mptcp_for_each_subflow(msk, subflow) { |
cf7da0d6 PK |
3530 | struct sock *ssk = mptcp_subflow_tcp_sock(subflow); |
3531 | ||
3532 | if (!ssk->sk_socket) | |
3533 | mptcp_sock_graft(ssk, newsock); | |
3534 | } | |
4d54cc32 | 3535 | release_sock(newsk); |
cf7da0d6 PK |
3536 | } |
3537 | ||
cf7da0d6 | 3538 | return err; |
cf7da0d6 PK |
3539 | } |
3540 | ||
8a05661b PA |
3541 | static __poll_t mptcp_check_readable(struct mptcp_sock *msk) |
3542 | { | |
612f71d7 PA |
3543 | /* Concurrent splices from sk_receive_queue into receive_queue will |
3544 | * always show at least one non-empty queue when checked in this order. | |
3545 | */ | |
3546 | if (skb_queue_empty_lockless(&((struct sock *)msk)->sk_receive_queue) && | |
3547 | skb_queue_empty_lockless(&msk->receive_queue)) | |
3548 | return 0; | |
3549 | ||
3550 | return EPOLLIN | EPOLLRDNORM; | |
8a05661b PA |
3551 | } |
3552 | ||
8edf0864 FW |
3553 | static __poll_t mptcp_check_writeable(struct mptcp_sock *msk) |
3554 | { | |
3555 | struct sock *sk = (struct sock *)msk; | |
8edf0864 FW |
3556 | |
3557 | if (unlikely(sk->sk_shutdown & SEND_SHUTDOWN)) | |
dd913410 | 3558 | return EPOLLOUT | EPOLLWRNORM; |
8edf0864 FW |
3559 | |
3560 | if (sk_stream_is_writeable(sk)) | |
3561 | return EPOLLOUT | EPOLLWRNORM; | |
3562 | ||
5cf92bba | 3563 | mptcp_set_nospace(sk); |
6e628cd3 PA |
3564 | smp_mb__after_atomic(); /* msk->flags is changed by write_space cb */ |
3565 | if (sk_stream_is_writeable(sk)) | |
3566 | return EPOLLOUT | EPOLLWRNORM; | |
8edf0864 | 3567 | |
6e628cd3 | 3568 | return 0; |
8edf0864 FW |
3569 | } |
3570 | ||
2303f994 PK |
3571 | static __poll_t mptcp_poll(struct file *file, struct socket *sock, |
3572 | struct poll_table_struct *wait) | |
3573 | { | |
1891c4a0 | 3574 | struct sock *sk = sock->sk; |
8ab183de | 3575 | struct mptcp_sock *msk; |
2303f994 | 3576 | __poll_t mask = 0; |
8a05661b | 3577 | int state; |
2303f994 | 3578 | |
1891c4a0 | 3579 | msk = mptcp_sk(sk); |
1891c4a0 | 3580 | sock_poll_wait(file, sock, wait); |
1891c4a0 | 3581 | |
8a05661b | 3582 | state = inet_sk_state_load(sk); |
6719331c | 3583 | pr_debug("msk=%p state=%d flags=%lx", msk, state, msk->flags); |
71ba088c PA |
3584 | if (state == TCP_LISTEN) { |
3585 | if (WARN_ON_ONCE(!msk->subflow || !msk->subflow->sk)) | |
3586 | return 0; | |
3587 | ||
3588 | return inet_csk_listen_poll(msk->subflow->sk); | |
3589 | } | |
8a05661b PA |
3590 | |
3591 | if (state != TCP_SYN_SENT && state != TCP_SYN_RECV) { | |
3592 | mask |= mptcp_check_readable(msk); | |
8edf0864 | 3593 | mask |= mptcp_check_writeable(msk); |
8a05661b | 3594 | } |
dd913410 PA |
3595 | if (sk->sk_shutdown == SHUTDOWN_MASK || state == TCP_CLOSE) |
3596 | mask |= EPOLLHUP; | |
1891c4a0 FW |
3597 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
3598 | mask |= EPOLLIN | EPOLLRDNORM | EPOLLRDHUP; | |
3599 | ||
15cc1045 PA |
3600 | /* This barrier is coupled with smp_wmb() in tcp_reset() */ |
3601 | smp_rmb(); | |
3602 | if (sk->sk_err) | |
3603 | mask |= EPOLLERR; | |
3604 | ||
2303f994 PK |
3605 | return mask; |
3606 | } | |
3607 | ||
e42f1ac6 FW |
3608 | static const struct proto_ops mptcp_stream_ops = { |
3609 | .family = PF_INET, | |
3610 | .owner = THIS_MODULE, | |
0a3cc579 | 3611 | .release = inet_release, |
e42f1ac6 FW |
3612 | .bind = mptcp_bind, |
3613 | .connect = mptcp_stream_connect, | |
3614 | .socketpair = sock_no_socketpair, | |
3615 | .accept = mptcp_stream_accept, | |
d2f77c53 | 3616 | .getname = inet_getname, |
e42f1ac6 FW |
3617 | .poll = mptcp_poll, |
3618 | .ioctl = inet_ioctl, | |
3619 | .gettstamp = sock_gettstamp, | |
3620 | .listen = mptcp_listen, | |
76e2a55d | 3621 | .shutdown = inet_shutdown, |
e42f1ac6 FW |
3622 | .setsockopt = sock_common_setsockopt, |
3623 | .getsockopt = sock_common_getsockopt, | |
3624 | .sendmsg = inet_sendmsg, | |
3625 | .recvmsg = inet_recvmsg, | |
3626 | .mmap = sock_no_mmap, | |
3627 | .sendpage = inet_sendpage, | |
e42f1ac6 | 3628 | }; |
2303f994 | 3629 | |
f870fa0b MM |
3630 | static struct inet_protosw mptcp_protosw = { |
3631 | .type = SOCK_STREAM, | |
3632 | .protocol = IPPROTO_MPTCP, | |
3633 | .prot = &mptcp_prot, | |
2303f994 PK |
3634 | .ops = &mptcp_stream_ops, |
3635 | .flags = INET_PROTOSW_ICSK, | |
f870fa0b MM |
3636 | }; |
3637 | ||
b19bc294 PA |
3638 | static int mptcp_napi_poll(struct napi_struct *napi, int budget) |
3639 | { | |
3640 | struct mptcp_delegated_action *delegated; | |
3641 | struct mptcp_subflow_context *subflow; | |
3642 | int work_done = 0; | |
3643 | ||
3644 | delegated = container_of(napi, struct mptcp_delegated_action, napi); | |
3645 | while ((subflow = mptcp_subflow_delegated_next(delegated)) != NULL) { | |
3646 | struct sock *ssk = mptcp_subflow_tcp_sock(subflow); | |
3647 | ||
3648 | bh_lock_sock_nested(ssk); | |
3649 | if (!sock_owned_by_user(ssk) && | |
3650 | mptcp_subflow_has_delegated_action(subflow)) | |
3651 | mptcp_subflow_process_delegated(ssk); | |
3652 | /* ... elsewhere tcp_release_cb_override already processed | |
3653 | * the action or will do at next release_sock(). | |
3654 | * In both case must dequeue the subflow here - on the same | |
3655 | * CPU that scheduled it. | |
3656 | */ | |
3657 | bh_unlock_sock(ssk); | |
3658 | sock_put(ssk); | |
3659 | ||
3660 | if (++work_done == budget) | |
3661 | return budget; | |
3662 | } | |
3663 | ||
3664 | /* always provide a 0 'work_done' argument, so that napi_complete_done | |
3665 | * will not try accessing the NULL napi->dev ptr | |
3666 | */ | |
3667 | napi_complete_done(napi, 0); | |
3668 | return work_done; | |
3669 | } | |
3670 | ||
d39dceca | 3671 | void __init mptcp_proto_init(void) |
f870fa0b | 3672 | { |
b19bc294 PA |
3673 | struct mptcp_delegated_action *delegated; |
3674 | int cpu; | |
3675 | ||
2303f994 | 3676 | mptcp_prot.h.hashinfo = tcp_prot.h.hashinfo; |
2303f994 | 3677 | |
d027236c PA |
3678 | if (percpu_counter_init(&mptcp_sockets_allocated, 0, GFP_KERNEL)) |
3679 | panic("Failed to allocate MPTCP pcpu counter\n"); | |
3680 | ||
b19bc294 PA |
3681 | init_dummy_netdev(&mptcp_napi_dev); |
3682 | for_each_possible_cpu(cpu) { | |
3683 | delegated = per_cpu_ptr(&mptcp_delegated_actions, cpu); | |
3684 | INIT_LIST_HEAD(&delegated->head); | |
3685 | netif_tx_napi_add(&mptcp_napi_dev, &delegated->napi, mptcp_napi_poll, | |
3686 | NAPI_POLL_WEIGHT); | |
3687 | napi_enable(&delegated->napi); | |
3688 | } | |
3689 | ||
2303f994 | 3690 | mptcp_subflow_init(); |
1b1c7a0e | 3691 | mptcp_pm_init(); |
2c5ebd00 | 3692 | mptcp_token_init(); |
2303f994 | 3693 | |
f870fa0b MM |
3694 | if (proto_register(&mptcp_prot, 1) != 0) |
3695 | panic("Failed to register MPTCP proto.\n"); | |
3696 | ||
3697 | inet_register_protosw(&mptcp_protosw); | |
6771bfd9 FW |
3698 | |
3699 | BUILD_BUG_ON(sizeof(struct mptcp_skb_cb) > sizeof_field(struct sk_buff, cb)); | |
f870fa0b MM |
3700 | } |
3701 | ||
3702 | #if IS_ENABLED(CONFIG_MPTCP_IPV6) | |
e42f1ac6 FW |
3703 | static const struct proto_ops mptcp_v6_stream_ops = { |
3704 | .family = PF_INET6, | |
3705 | .owner = THIS_MODULE, | |
0a3cc579 | 3706 | .release = inet6_release, |
e42f1ac6 FW |
3707 | .bind = mptcp_bind, |
3708 | .connect = mptcp_stream_connect, | |
3709 | .socketpair = sock_no_socketpair, | |
3710 | .accept = mptcp_stream_accept, | |
d2f77c53 | 3711 | .getname = inet6_getname, |
e42f1ac6 FW |
3712 | .poll = mptcp_poll, |
3713 | .ioctl = inet6_ioctl, | |
3714 | .gettstamp = sock_gettstamp, | |
3715 | .listen = mptcp_listen, | |
76e2a55d | 3716 | .shutdown = inet_shutdown, |
e42f1ac6 FW |
3717 | .setsockopt = sock_common_setsockopt, |
3718 | .getsockopt = sock_common_getsockopt, | |
3719 | .sendmsg = inet6_sendmsg, | |
3720 | .recvmsg = inet6_recvmsg, | |
3721 | .mmap = sock_no_mmap, | |
3722 | .sendpage = inet_sendpage, | |
3723 | #ifdef CONFIG_COMPAT | |
3986912f | 3724 | .compat_ioctl = inet6_compat_ioctl, |
e42f1ac6 FW |
3725 | #endif |
3726 | }; | |
3727 | ||
f870fa0b MM |
3728 | static struct proto mptcp_v6_prot; |
3729 | ||
79c0949e PK |
3730 | static void mptcp_v6_destroy(struct sock *sk) |
3731 | { | |
3732 | mptcp_destroy(sk); | |
3733 | inet6_destroy_sock(sk); | |
3734 | } | |
3735 | ||
f870fa0b MM |
3736 | static struct inet_protosw mptcp_v6_protosw = { |
3737 | .type = SOCK_STREAM, | |
3738 | .protocol = IPPROTO_MPTCP, | |
3739 | .prot = &mptcp_v6_prot, | |
2303f994 | 3740 | .ops = &mptcp_v6_stream_ops, |
f870fa0b MM |
3741 | .flags = INET_PROTOSW_ICSK, |
3742 | }; | |
3743 | ||
d39dceca | 3744 | int __init mptcp_proto_v6_init(void) |
f870fa0b MM |
3745 | { |
3746 | int err; | |
3747 | ||
3748 | mptcp_v6_prot = mptcp_prot; | |
3749 | strcpy(mptcp_v6_prot.name, "MPTCPv6"); | |
3750 | mptcp_v6_prot.slab = NULL; | |
79c0949e | 3751 | mptcp_v6_prot.destroy = mptcp_v6_destroy; |
b0519de8 | 3752 | mptcp_v6_prot.obj_size = sizeof(struct mptcp6_sock); |
f870fa0b MM |
3753 | |
3754 | err = proto_register(&mptcp_v6_prot, 1); | |
3755 | if (err) | |
3756 | return err; | |
3757 | ||
3758 | err = inet6_register_protosw(&mptcp_v6_protosw); | |
3759 | if (err) | |
3760 | proto_unregister(&mptcp_v6_prot); | |
3761 | ||
3762 | return err; | |
3763 | } | |
3764 | #endif |