projects / linux-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
Merge branches 'pm-domains' and 'pm-core'
[linux-block.git] / net / mptcp / sockopt.c
CommitLineData
0abdde82
PA		 1// SPDX-License-Identifier: GPL-2.0
2/* Multipath TCP
3 *
4 * Copyright (c) 2021, Red Hat.
5 */
6
7#define pr_fmt(fmt) "MPTCP: " fmt
8
9#include <linux/kernel.h>
10#include <linux/module.h>
11#include <net/sock.h>
12#include <net/protocol.h>
13#include <net/tcp.h>
14#include <net/mptcp.h>
15#include "protocol.h"
16
06f15cee
FW		 17#define MIN_INFO_OPTLEN_SIZE 16
18
0abdde82
PA		 19static struct sock *__mptcp_tcp_fallback(struct mptcp_sock *msk)
20{
21 sock_owned_by_me((const struct sock *)msk);
22
23 if (likely(!__mptcp_check_fallback(msk)))
24 return NULL;
25
26 return msk->first;
27}
28
df00b087
FW		 29static u32 sockopt_seq_reset(const struct sock *sk)
30{
31 sock_owned_by_me(sk);
32
33 /* Highbits contain state. Allows to distinguish sockopt_seq
34 * of listener and established:
35 * s0 = new_listener()
36 * sockopt(s0) - seq is 1
37 * s1 = accept(s0) - s1 inherits seq 1 if listener sk (s0)
38 * sockopt(s0) - seq increments to 2 on s0
39 * sockopt(s1) // seq increments to 2 on s1 (different option)
40 * new ssk completes join, inherits options from s0 // seq 2
41 * Needs sync from mptcp join logic, but ssk->seq == msk->seq
42 *
43 * Set High order bits to sk_state so ssk->seq == msk->seq test
44 * will fail.
45 */
46
47 return (u32)sk->sk_state << 24u;
48}
49
1b3e7ede
FW		 50static void sockopt_seq_inc(struct mptcp_sock *msk)
51{
52 u32 seq = (msk->setsockopt_seq + 1) & 0x00ffffff;
53
54 msk->setsockopt_seq = sockopt_seq_reset((struct sock *)msk) + seq;
55}
56
57static int mptcp_get_int_option(struct mptcp_sock *msk, sockptr_t optval,
58 unsigned int optlen, int *val)
59{
60 if (optlen < sizeof(int))
61 return -EINVAL;
62
63 if (copy_from_sockptr(val, optval, sizeof(*val)))
64 return -EFAULT;
65
66 return 0;
67}
68
69static void mptcp_sol_socket_sync_intval(struct mptcp_sock *msk, int optname, int val)
70{
71 struct mptcp_subflow_context *subflow;
72 struct sock *sk = (struct sock *)msk;
73
74 lock_sock(sk);
75 sockopt_seq_inc(msk);
76
77 mptcp_for_each_subflow(msk, subflow) {
78 struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
79 bool slow = lock_sock_fast(ssk);
80
81 switch (optname) {
a03c99b2
FW		 82 case SO_DEBUG:
83 sock_valbool_flag(ssk, SOCK_DBG, !!val);
84 break;
1b3e7ede
FW		 85 case SO_KEEPALIVE:
86 if (ssk->sk_prot->keepalive)
87 ssk->sk_prot->keepalive(ssk, !!val);
88 sock_valbool_flag(ssk, SOCK_KEEPOPEN, !!val);
89 break;
90 case SO_PRIORITY:
91 ssk->sk_priority = val;
92 break;
5d0a6bc8
FW		 93 case SO_SNDBUF:
94 case SO_SNDBUFFORCE:
95 ssk->sk_userlocks |= SOCK_SNDBUF_LOCK;
96 WRITE_ONCE(ssk->sk_sndbuf, sk->sk_sndbuf);
97 break;
98 case SO_RCVBUF:
99 case SO_RCVBUFFORCE:
100 ssk->sk_userlocks |= SOCK_RCVBUF_LOCK;
101 WRITE_ONCE(ssk->sk_rcvbuf, sk->sk_rcvbuf);
102 break;
36704413
FW		 103 case SO_MARK:
104 if (READ_ONCE(ssk->sk_mark) != sk->sk_mark) {
105 ssk->sk_mark = sk->sk_mark;
106 sk_dst_reset(ssk);
107 }
108 break;
6f0d7198
FW		 109 case SO_INCOMING_CPU:
110 WRITE_ONCE(ssk->sk_incoming_cpu, val);
111 break;
1b3e7ede
FW		 112 }
113
114 subflow->setsockopt_seq = msk->setsockopt_seq;
115 unlock_sock_fast(ssk, slow);
116 }
117
118 release_sock(sk);
119}
120
121static int mptcp_sol_socket_intval(struct mptcp_sock *msk, int optname, int val)
122{
123 sockptr_t optval = KERNEL_SOCKPTR(&val);
124 struct sock *sk = (struct sock *)msk;
125 int ret;
126
127 ret = sock_setsockopt(sk->sk_socket, SOL_SOCKET, optname,
128 optval, sizeof(val));
129 if (ret)
130 return ret;
131
132 mptcp_sol_socket_sync_intval(msk, optname, val);
133 return 0;
134}
135
6f0d7198
FW		 136static void mptcp_so_incoming_cpu(struct mptcp_sock *msk, int val)
137{
138 struct sock *sk = (struct sock *)msk;
139
140 WRITE_ONCE(sk->sk_incoming_cpu, val);
141
142 mptcp_sol_socket_sync_intval(msk, SO_INCOMING_CPU, val);
143}
144
9061f24b
FW		 145static int mptcp_setsockopt_sol_socket_tstamp(struct mptcp_sock *msk, int optname, int val)
146{
147 sockptr_t optval = KERNEL_SOCKPTR(&val);
148 struct mptcp_subflow_context *subflow;
149 struct sock *sk = (struct sock *)msk;
150 int ret;
151
152 ret = sock_setsockopt(sk->sk_socket, SOL_SOCKET, optname,
153 optval, sizeof(val));
154 if (ret)
155 return ret;
156
157 lock_sock(sk);
158 mptcp_for_each_subflow(msk, subflow) {
159 struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
160 bool slow = lock_sock_fast(ssk);
161
6c9a0a0f 162 sock_set_timestamp(sk, optname, !!val);
9061f24b
FW		 163 unlock_sock_fast(ssk, slow);
164 }
165
166 release_sock(sk);
167 return 0;
168}
169
1b3e7ede 170static int mptcp_setsockopt_sol_socket_int(struct mptcp_sock *msk, int optname,
6c9a0a0f
YL		 171 sockptr_t optval,
172 unsigned int optlen)
1b3e7ede
FW		 173{
174 int val, ret;
175
176 ret = mptcp_get_int_option(msk, optval, optlen, &val);
177 if (ret)
178 return ret;
179
180 switch (optname) {
181 case SO_KEEPALIVE:
182 mptcp_sol_socket_sync_intval(msk, optname, val);
183 return 0;
a03c99b2 184 case SO_DEBUG:
36704413 185 case SO_MARK:
1b3e7ede 186 case SO_PRIORITY:
5d0a6bc8
FW		 187 case SO_SNDBUF:
188 case SO_SNDBUFFORCE:
189 case SO_RCVBUF:
190 case SO_RCVBUFFORCE:
1b3e7ede 191 return mptcp_sol_socket_intval(msk, optname, val);
6f0d7198
FW		 192 case SO_INCOMING_CPU:
193 mptcp_so_incoming_cpu(msk, val);
194 return 0;
9061f24b
FW		 195 case SO_TIMESTAMP_OLD:
196 case SO_TIMESTAMP_NEW:
197 case SO_TIMESTAMPNS_OLD:
198 case SO_TIMESTAMPNS_NEW:
9061f24b 199 return mptcp_setsockopt_sol_socket_tstamp(msk, optname, val);
1b3e7ede
FW		 200 }
201
202 return -ENOPROTOOPT;
203}
204
6c9a0a0f
YL		 205static int mptcp_setsockopt_sol_socket_timestamping(struct mptcp_sock *msk,
206 int optname,
207 sockptr_t optval,
208 unsigned int optlen)
209{
210 struct mptcp_subflow_context *subflow;
211 struct sock *sk = (struct sock *)msk;
d463126e
YL		 212 struct so_timestamping timestamping;
213 int ret;
6c9a0a0f 214
d463126e
YL		 215 if (optlen == sizeof(timestamping)) {
216 if (copy_from_sockptr(&timestamping, optval,
217 sizeof(timestamping)))
218 return -EFAULT;
219 } else if (optlen == sizeof(int)) {
220 memset(&timestamping, 0, sizeof(timestamping));
221
222 if (copy_from_sockptr(&timestamping.flags, optval, sizeof(int)))
223 return -EFAULT;
224 } else {
225 return -EINVAL;
226 }
6c9a0a0f
YL		 227
228 ret = sock_setsockopt(sk->sk_socket, SOL_SOCKET, optname,
d463126e
YL		 229 KERNEL_SOCKPTR(&timestamping),
230 sizeof(timestamping));
6c9a0a0f
YL		 231 if (ret)
232 return ret;
233
234 lock_sock(sk);
235
236 mptcp_for_each_subflow(msk, subflow) {
237 struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
238 bool slow = lock_sock_fast(ssk);
239
d463126e 240 sock_set_timestamping(sk, optname, timestamping);
6c9a0a0f
YL		 241 unlock_sock_fast(ssk, slow);
242 }
243
244 release_sock(sk);
245
246 return 0;
247}
248
268b1238
FW		 249static int mptcp_setsockopt_sol_socket_linger(struct mptcp_sock *msk, sockptr_t optval,
250 unsigned int optlen)
251{
252 struct mptcp_subflow_context *subflow;
253 struct sock *sk = (struct sock *)msk;
254 struct linger ling;
255 sockptr_t kopt;
256 int ret;
257
258 if (optlen < sizeof(ling))
259 return -EINVAL;
260
261 if (copy_from_sockptr(&ling, optval, sizeof(ling)))
262 return -EFAULT;
263
264 kopt = KERNEL_SOCKPTR(&ling);
265 ret = sock_setsockopt(sk->sk_socket, SOL_SOCKET, SO_LINGER, kopt, sizeof(ling));
266 if (ret)
267 return ret;
268
269 lock_sock(sk);
270 sockopt_seq_inc(msk);
271 mptcp_for_each_subflow(msk, subflow) {
272 struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
273 bool slow = lock_sock_fast(ssk);
274
275 if (!ling.l_onoff) {
276 sock_reset_flag(ssk, SOCK_LINGER);
277 } else {
278 ssk->sk_lingertime = sk->sk_lingertime;
279 sock_set_flag(ssk, SOCK_LINGER);
280 }
281
282 subflow->setsockopt_seq = msk->setsockopt_seq;
283 unlock_sock_fast(ssk, slow);
284 }
285
286 release_sock(sk);
287 return 0;
288}
289
0abdde82
PA		 290static int mptcp_setsockopt_sol_socket(struct mptcp_sock *msk, int optname,
291 sockptr_t optval, unsigned int optlen)
292{
293 struct sock *sk = (struct sock *)msk;
294 struct socket *ssock;
295 int ret;
296
297 switch (optname) {
298 case SO_REUSEPORT:
299 case SO_REUSEADDR:
5d0a6bc8
FW		 300 case SO_BINDTODEVICE:
301 case SO_BINDTOIFINDEX:
0abdde82
PA		 302 lock_sock(sk);
303 ssock = __mptcp_nmpc_socket(msk);
304 if (!ssock) {
305 release_sock(sk);
306 return -EINVAL;
307 }
308
309 ret = sock_setsockopt(ssock, SOL_SOCKET, optname, optval, optlen);
310 if (ret == 0) {
311 if (optname == SO_REUSEPORT)
312 sk->sk_reuseport = ssock->sk->sk_reuseport;
313 else if (optname == SO_REUSEADDR)
314 sk->sk_reuse = ssock->sk->sk_reuse;
5d0a6bc8
FW		 315 else if (optname == SO_BINDTODEVICE)
316 sk->sk_bound_dev_if = ssock->sk->sk_bound_dev_if;
317 else if (optname == SO_BINDTOIFINDEX)
318 sk->sk_bound_dev_if = ssock->sk->sk_bound_dev_if;
0abdde82
PA		 319 }
320 release_sock(sk);
321 return ret;
1b3e7ede
FW		 322 case SO_KEEPALIVE:
323 case SO_PRIORITY:
5d0a6bc8
FW		 324 case SO_SNDBUF:
325 case SO_SNDBUFFORCE:
326 case SO_RCVBUF:
327 case SO_RCVBUFFORCE:
36704413 328 case SO_MARK:
6f0d7198 329 case SO_INCOMING_CPU:
a03c99b2 330 case SO_DEBUG:
9061f24b
FW		 331 case SO_TIMESTAMP_OLD:
332 case SO_TIMESTAMP_NEW:
333 case SO_TIMESTAMPNS_OLD:
334 case SO_TIMESTAMPNS_NEW:
6c9a0a0f
YL		 335 return mptcp_setsockopt_sol_socket_int(msk, optname, optval,
336 optlen);
9061f24b
FW		 337 case SO_TIMESTAMPING_OLD:
338 case SO_TIMESTAMPING_NEW:
6c9a0a0f
YL		 339 return mptcp_setsockopt_sol_socket_timestamping(msk, optname,
340 optval, optlen);
268b1238
FW		 341 case SO_LINGER:
342 return mptcp_setsockopt_sol_socket_linger(msk, optval, optlen);
7a009a70
FW		 343 case SO_RCVLOWAT:
344 case SO_RCVTIMEO_OLD:
345 case SO_RCVTIMEO_NEW:
d6ab5ea2
GT		 346 case SO_SNDTIMEO_OLD:
347 case SO_SNDTIMEO_NEW:
7a009a70
FW		 348 case SO_BUSY_POLL:
349 case SO_PREFER_BUSY_POLL:
350 case SO_BUSY_POLL_BUDGET:
351 /* No need to copy: only relevant for msk */
352 return sock_setsockopt(sk->sk_socket, SOL_SOCKET, optname, optval, optlen);
a03c99b2
FW		 353 case SO_NO_CHECK:
354 case SO_DONTROUTE:
355 case SO_BROADCAST:
356 case SO_BSDCOMPAT:
357 case SO_PASSCRED:
358 case SO_PASSSEC:
359 case SO_RXQ_OVFL:
360 case SO_WIFI_STATUS:
361 case SO_NOFCS:
362 case SO_SELECT_ERR_QUEUE:
363 return 0;
0abdde82
PA		 364 }
365
7a009a70
FW		 366 /* SO_OOBINLINE is not supported, let's avoid the related mess
367 * SO_ATTACH_FILTER, SO_ATTACH_BPF, SO_ATTACH_REUSEPORT_CBPF,
368 * SO_DETACH_REUSEPORT_BPF, SO_DETACH_FILTER, SO_LOCK_FILTER,
369 * we must be careful with subflows
370 *
371 * SO_ATTACH_REUSEPORT_EBPF is not supported, at it checks
372 * explicitly the sk_protocol field
373 *
374 * SO_PEEK_OFF is unsupported, as it is for plain TCP
375 * SO_MAX_PACING_RATE is unsupported, we must be careful with subflows
376 * SO_CNX_ADVICE is currently unsupported, could possibly be relevant,
377 * but likely needs careful design
378 *
379 * SO_ZEROCOPY is currently unsupported, TODO in sndmsg
380 * SO_TXTIME is currently unsupported
381 */
382
383 return -EOPNOTSUPP;
0abdde82
PA		 384}
385
386static int mptcp_setsockopt_v6(struct mptcp_sock *msk, int optname,
387 sockptr_t optval, unsigned int optlen)
388{
389 struct sock *sk = (struct sock *)msk;
390 int ret = -EOPNOTSUPP;
391 struct socket *ssock;
392
393 switch (optname) {
394 case IPV6_V6ONLY:
c9406a23
FW		 395 case IPV6_TRANSPARENT:
396 case IPV6_FREEBIND:
0abdde82
PA		 397 lock_sock(sk);
398 ssock = __mptcp_nmpc_socket(msk);
399 if (!ssock) {
400 release_sock(sk);
401 return -EINVAL;
402 }
403
404 ret = tcp_setsockopt(ssock->sk, SOL_IPV6, optname, optval, optlen);
c9406a23
FW		 405 if (ret != 0) {
406 release_sock(sk);
407 return ret;
408 }
409
410 sockopt_seq_inc(msk);
411
412 switch (optname) {
413 case IPV6_V6ONLY:
0abdde82 414 sk->sk_ipv6only = ssock->sk->sk_ipv6only;
c9406a23
FW		 415 break;
416 case IPV6_TRANSPARENT:
417 inet_sk(sk)->transparent = inet_sk(ssock->sk)->transparent;
418 break;
419 case IPV6_FREEBIND:
420 inet_sk(sk)->freebind = inet_sk(ssock->sk)->freebind;
421 break;
422 }
0abdde82
PA		 423
424 release_sock(sk);
425 break;
426 }
427
428 return ret;
429}
430
d9e4c129
PA		 431static bool mptcp_supported_sockopt(int level, int optname)
432{
d9e4c129
PA		 433 if (level == SOL_IP) {
434 switch (optname) {
435 /* should work fine */
436 case IP_FREEBIND:
437 case IP_TRANSPARENT:
438
439 /* the following are control cmsg related */
440 case IP_PKTINFO:
441 case IP_RECVTTL:
442 case IP_RECVTOS:
443 case IP_RECVOPTS:
444 case IP_RETOPTS:
445 case IP_PASSSEC:
446 case IP_RECVORIGDSTADDR:
447 case IP_CHECKSUM:
448 case IP_RECVFRAGSIZE:
449
450 /* common stuff that need some love */
451 case IP_TOS:
452 case IP_TTL:
453 case IP_BIND_ADDRESS_NO_PORT:
454 case IP_MTU_DISCOVER:
455 case IP_RECVERR:
456
457 /* possibly less common may deserve some love */
458 case IP_MINTTL:
459
460 /* the following is apparently a no-op for plain TCP */
461 case IP_RECVERR_RFC4884:
462 return true;
463 }
464
465 /* IP_OPTIONS is not supported, needs subflow care */
466 /* IP_HDRINCL, IP_NODEFRAG are not supported, RAW specific */
467 /* IP_MULTICAST_TTL, IP_MULTICAST_LOOP, IP_UNICAST_IF,
468 * IP_ADD_MEMBERSHIP, IP_ADD_SOURCE_MEMBERSHIP, IP_DROP_MEMBERSHIP,
469 * IP_DROP_SOURCE_MEMBERSHIP, IP_BLOCK_SOURCE, IP_UNBLOCK_SOURCE,
470 * MCAST_JOIN_GROUP, MCAST_LEAVE_GROUP MCAST_JOIN_SOURCE_GROUP,
471 * MCAST_LEAVE_SOURCE_GROUP, MCAST_BLOCK_SOURCE, MCAST_UNBLOCK_SOURCE,
472 * MCAST_MSFILTER, IP_MULTICAST_ALL are not supported, better not deal
473 * with mcast stuff
474 */
475 /* IP_IPSEC_POLICY, IP_XFRM_POLICY are nut supported, unrelated here */
476 return false;
477 }
478 if (level == SOL_IPV6) {
479 switch (optname) {
480 case IPV6_V6ONLY:
481
482 /* the following are control cmsg related */
483 case IPV6_RECVPKTINFO:
484 case IPV6_2292PKTINFO:
485 case IPV6_RECVHOPLIMIT:
486 case IPV6_2292HOPLIMIT:
487 case IPV6_RECVRTHDR:
488 case IPV6_2292RTHDR:
489 case IPV6_RECVHOPOPTS:
490 case IPV6_2292HOPOPTS:
491 case IPV6_RECVDSTOPTS:
492 case IPV6_2292DSTOPTS:
493 case IPV6_RECVTCLASS:
494 case IPV6_FLOWINFO:
495 case IPV6_RECVPATHMTU:
496 case IPV6_RECVORIGDSTADDR:
497 case IPV6_RECVFRAGSIZE:
498
499 /* the following ones need some love but are quite common */
500 case IPV6_TCLASS:
501 case IPV6_TRANSPARENT:
502 case IPV6_FREEBIND:
503 case IPV6_PKTINFO:
504 case IPV6_2292PKTOPTIONS:
505 case IPV6_UNICAST_HOPS:
506 case IPV6_MTU_DISCOVER:
507 case IPV6_MTU:
508 case IPV6_RECVERR:
509 case IPV6_FLOWINFO_SEND:
510 case IPV6_FLOWLABEL_MGR:
511 case IPV6_MINHOPCOUNT:
512 case IPV6_DONTFRAG:
513 case IPV6_AUTOFLOWLABEL:
514
515 /* the following one is a no-op for plain TCP */
516 case IPV6_RECVERR_RFC4884:
517 return true;
518 }
519
520 /* IPV6_HOPOPTS, IPV6_RTHDRDSTOPTS, IPV6_RTHDR, IPV6_DSTOPTS are
521 * not supported
522 */
523 /* IPV6_MULTICAST_HOPS, IPV6_MULTICAST_LOOP, IPV6_UNICAST_IF,
524 * IPV6_MULTICAST_IF, IPV6_ADDRFORM,
525 * IPV6_ADD_MEMBERSHIP, IPV6_DROP_MEMBERSHIP, IPV6_JOIN_ANYCAST,
526 * IPV6_LEAVE_ANYCAST, IPV6_MULTICAST_ALL, MCAST_JOIN_GROUP, MCAST_LEAVE_GROUP,
527 * MCAST_JOIN_SOURCE_GROUP, MCAST_LEAVE_SOURCE_GROUP,
528 * MCAST_BLOCK_SOURCE, MCAST_UNBLOCK_SOURCE, MCAST_MSFILTER
529 * are not supported better not deal with mcast
530 */
531 /* IPV6_ROUTER_ALERT, IPV6_ROUTER_ALERT_ISOLATE are not supported, since are evil */
532
533 /* IPV6_IPSEC_POLICY, IPV6_XFRM_POLICY are not supported */
534 /* IPV6_ADDR_PREFERENCES is not supported, we must be careful with subflows */
535 return false;
536 }
537 if (level == SOL_TCP) {
538 switch (optname) {
539 /* the following are no-op or should work just fine */
540 case TCP_THIN_DUPACK:
541 case TCP_DEFER_ACCEPT:
542
543 /* the following need some love */
544 case TCP_MAXSEG:
545 case TCP_NODELAY:
546 case TCP_THIN_LINEAR_TIMEOUTS:
547 case TCP_CONGESTION:
d9e4c129
PA		 548 case TCP_CORK:
549 case TCP_KEEPIDLE:
550 case TCP_KEEPINTVL:
551 case TCP_KEEPCNT:
552 case TCP_SYNCNT:
553 case TCP_SAVE_SYN:
554 case TCP_LINGER2:
555 case TCP_WINDOW_CLAMP:
556 case TCP_QUICKACK:
557 case TCP_USER_TIMEOUT:
558 case TCP_TIMESTAMP:
559 case TCP_NOTSENT_LOWAT:
560 case TCP_TX_DELAY:
2c9e7765 561 case TCP_INQ:
d9e4c129
PA		 562 return true;
563 }
564
565 /* TCP_MD5SIG, TCP_MD5SIG_EXT are not supported, MD5 is not compatible with MPTCP */
566
567 /* TCP_REPAIR, TCP_REPAIR_QUEUE, TCP_QUEUE_SEQ, TCP_REPAIR_OPTIONS,
568 * TCP_REPAIR_WINDOW are not supported, better avoid this mess
569 */
570 /* TCP_FASTOPEN_KEY, TCP_FASTOPEN TCP_FASTOPEN_CONNECT, TCP_FASTOPEN_NO_COOKIE,
571 * are not supported fastopen is currently unsupported
572 */
d9e4c129
PA		 573 }
574 return false;
575}
576
aa1fbd94
FW		 577static int mptcp_setsockopt_sol_tcp_congestion(struct mptcp_sock *msk, sockptr_t optval,
578 unsigned int optlen)
579{
580 struct mptcp_subflow_context *subflow;
581 struct sock *sk = (struct sock *)msk;
582 char name[TCP_CA_NAME_MAX];
583 bool cap_net_admin;
584 int ret;
585
586 if (optlen < 1)
587 return -EINVAL;
588
589 ret = strncpy_from_sockptr(name, optval,
590 min_t(long, TCP_CA_NAME_MAX - 1, optlen));
591 if (ret < 0)
592 return -EFAULT;
593
594 name[ret] = 0;
595
596 cap_net_admin = ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN);
597
598 ret = 0;
599 lock_sock(sk);
600 sockopt_seq_inc(msk);
601 mptcp_for_each_subflow(msk, subflow) {
602 struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
603 int err;
604
605 lock_sock(ssk);
606 err = tcp_set_congestion_control(ssk, name, true, cap_net_admin);
607 if (err < 0 && ret == 0)
608 ret = err;
609 subflow->setsockopt_seq = msk->setsockopt_seq;
610 release_sock(ssk);
611 }
612
613 if (ret == 0)
20b5759f 614 strcpy(msk->ca_name, name);
aa1fbd94
FW		 615
616 release_sock(sk);
617 return ret;
618}
619
4f6e14bd
MG		 620static int mptcp_setsockopt_sol_tcp_cork(struct mptcp_sock *msk, sockptr_t optval,
621 unsigned int optlen)
622{
623 struct mptcp_subflow_context *subflow;
624 struct sock *sk = (struct sock *)msk;
625 int val;
626
627 if (optlen < sizeof(int))
628 return -EINVAL;
629
630 if (copy_from_sockptr(&val, optval, sizeof(val)))
631 return -EFAULT;
632
633 lock_sock(sk);
634 sockopt_seq_inc(msk);
635 msk->cork = !!val;
636 mptcp_for_each_subflow(msk, subflow) {
637 struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
638
639 lock_sock(ssk);
640 __tcp_sock_set_cork(ssk, !!val);
641 release_sock(ssk);
642 }
643 if (!val)
644 mptcp_check_and_set_pending(sk);
645 release_sock(sk);
646
647 return 0;
648}
649
650static int mptcp_setsockopt_sol_tcp_nodelay(struct mptcp_sock *msk, sockptr_t optval,
651 unsigned int optlen)
652{
653 struct mptcp_subflow_context *subflow;
654 struct sock *sk = (struct sock *)msk;
655 int val;
656
657 if (optlen < sizeof(int))
658 return -EINVAL;
659
660 if (copy_from_sockptr(&val, optval, sizeof(val)))
661 return -EFAULT;
662
663 lock_sock(sk);
664 sockopt_seq_inc(msk);
665 msk->nodelay = !!val;
666 mptcp_for_each_subflow(msk, subflow) {
667 struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
668
669 lock_sock(ssk);
670 __tcp_sock_set_nodelay(ssk, !!val);
671 release_sock(ssk);
672 }
673 if (val)
674 mptcp_check_and_set_pending(sk);
675 release_sock(sk);
676
677 return 0;
678}
679
c9406a23
FW		 680static int mptcp_setsockopt_sol_ip_set_transparent(struct mptcp_sock *msk, int optname,
681 sockptr_t optval, unsigned int optlen)
682{
683 struct sock *sk = (struct sock *)msk;
684 struct inet_sock *issk;
685 struct socket *ssock;
686 int err;
687
688 err = ip_setsockopt(sk, SOL_IP, optname, optval, optlen);
689 if (err != 0)
690 return err;
691
692 lock_sock(sk);
693
694 ssock = __mptcp_nmpc_socket(msk);
695 if (!ssock) {
696 release_sock(sk);
697 return -EINVAL;
698 }
699
700 issk = inet_sk(ssock->sk);
701
702 switch (optname) {
703 case IP_FREEBIND:
704 issk->freebind = inet_sk(sk)->freebind;
705 break;
706 case IP_TRANSPARENT:
707 issk->transparent = inet_sk(sk)->transparent;
708 break;
709 default:
710 release_sock(sk);
711 WARN_ON_ONCE(1);
712 return -EOPNOTSUPP;
713 }
714
715 sockopt_seq_inc(msk);
716 release_sock(sk);
717 return 0;
718}
719
ffcacff8
PS		 720static int mptcp_setsockopt_v4_set_tos(struct mptcp_sock *msk, int optname,
721 sockptr_t optval, unsigned int optlen)
722{
723 struct mptcp_subflow_context *subflow;
724 struct sock *sk = (struct sock *)msk;
725 int err, val;
726
727 err = ip_setsockopt(sk, SOL_IP, optname, optval, optlen);
728
729 if (err != 0)
730 return err;
731
732 lock_sock(sk);
733 sockopt_seq_inc(msk);
734 val = inet_sk(sk)->tos;
735 mptcp_for_each_subflow(msk, subflow) {
736 struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
737
738 __ip_sock_set_tos(ssk, val);
739 }
740 release_sock(sk);
741
742 return err;
743}
744
745static int mptcp_setsockopt_v4(struct mptcp_sock *msk, int optname,
746 sockptr_t optval, unsigned int optlen)
747{
748 switch (optname) {
c9406a23
FW		 749 case IP_FREEBIND:
750 case IP_TRANSPARENT:
751 return mptcp_setsockopt_sol_ip_set_transparent(msk, optname, optval, optlen);
ffcacff8
PS		 752 case IP_TOS:
753 return mptcp_setsockopt_v4_set_tos(msk, optname, optval, optlen);
754 }
755
756 return -EOPNOTSUPP;
757}
758
ea1e301d
FW		 759static int mptcp_setsockopt_sol_tcp_defer(struct mptcp_sock *msk, sockptr_t optval,
760 unsigned int optlen)
761{
762 struct socket *listener;
763
764 listener = __mptcp_nmpc_socket(msk);
765 if (!listener)
766 return 0; /* TCP_DEFER_ACCEPT does not fail */
767
768 return tcp_setsockopt(listener->sk, SOL_TCP, TCP_DEFER_ACCEPT, optval, optlen);
769}
770
aa1fbd94
FW		 771static int mptcp_setsockopt_sol_tcp(struct mptcp_sock *msk, int optname,
772 sockptr_t optval, unsigned int optlen)
773{
2c9e7765
FW		 774 struct sock *sk = (void *)msk;
775 int ret, val;
776
aa1fbd94 777 switch (optname) {
2c9e7765
FW		 778 case TCP_INQ:
779 ret = mptcp_get_int_option(msk, optval, optlen, &val);
780 if (ret)
781 return ret;
782 if (val < 0 || val > 1)
783 return -EINVAL;
784
785 lock_sock(sk);
786 msk->recvmsg_inq = !!val;
787 release_sock(sk);
788 return 0;
aa1fbd94
FW		 789 case TCP_ULP:
790 return -EOPNOTSUPP;
791 case TCP_CONGESTION:
792 return mptcp_setsockopt_sol_tcp_congestion(msk, optval, optlen);
4f6e14bd
MG		 793 case TCP_CORK:
794 return mptcp_setsockopt_sol_tcp_cork(msk, optval, optlen);
795 case TCP_NODELAY:
796 return mptcp_setsockopt_sol_tcp_nodelay(msk, optval, optlen);
ea1e301d
FW		 797 case TCP_DEFER_ACCEPT:
798 return mptcp_setsockopt_sol_tcp_defer(msk, optval, optlen);
aa1fbd94
FW		 799 }
800
801 return -EOPNOTSUPP;
802}
803
0abdde82
PA		 804int mptcp_setsockopt(struct sock *sk, int level, int optname,
805 sockptr_t optval, unsigned int optlen)
806{
807 struct mptcp_sock *msk = mptcp_sk(sk);
808 struct sock *ssk;
809
810 pr_debug("msk=%p", msk);
811
812 if (level == SOL_SOCKET)
813 return mptcp_setsockopt_sol_socket(msk, optname, optval, optlen);
814
7a009a70
FW		 815 if (!mptcp_supported_sockopt(level, optname))
816 return -ENOPROTOOPT;
817
0abdde82
PA		 818 /* @@ the meaning of setsockopt() when the socket is connected and
819 * there are multiple subflows is not yet defined. It is up to the
820 * MPTCP-level socket to configure the subflows until the subflow
821 * is in TCP fallback, when TCP socket options are passed through
822 * to the one remaining subflow.
823 */
824 lock_sock(sk);
825 ssk = __mptcp_tcp_fallback(msk);
826 release_sock(sk);
827 if (ssk)
828 return tcp_setsockopt(ssk, level, optname, optval, optlen);
829
ffcacff8
PS		 830 if (level == SOL_IP)
831 return mptcp_setsockopt_v4(msk, optname, optval, optlen);
832
0abdde82
PA		 833 if (level == SOL_IPV6)
834 return mptcp_setsockopt_v6(msk, optname, optval, optlen);
835
aa1fbd94
FW		 836 if (level == SOL_TCP)
837 return mptcp_setsockopt_sol_tcp(msk, optname, optval, optlen);
838
839 return -EOPNOTSUPP;
840}
841
842static int mptcp_getsockopt_first_sf_only(struct mptcp_sock *msk, int level, int optname,
843 char __user *optval, int __user *optlen)
844{
845 struct sock *sk = (struct sock *)msk;
846 struct socket *ssock;
847 int ret = -EINVAL;
848 struct sock *ssk;
849
850 lock_sock(sk);
851 ssk = msk->first;
852 if (ssk) {
853 ret = tcp_getsockopt(ssk, level, optname, optval, optlen);
854 goto out;
855 }
856
857 ssock = __mptcp_nmpc_socket(msk);
858 if (!ssock)
859 goto out;
860
861 ret = tcp_getsockopt(ssock->sk, level, optname, optval, optlen);
862
863out:
864 release_sock(sk);
865 return ret;
866}
867
61bc6e82
FW		 868void mptcp_diag_fill_info(struct mptcp_sock *msk, struct mptcp_info *info)
869{
61bc6e82
FW		 870 u32 flags = 0;
871 u8 val;
872
55c42fa7
FW		 873 memset(info, 0, sizeof(*info));
874
61bc6e82
FW		 875 info->mptcpi_subflows = READ_ONCE(msk->pm.subflows);
876 info->mptcpi_add_addr_signal = READ_ONCE(msk->pm.add_addr_signaled);
877 info->mptcpi_add_addr_accepted = READ_ONCE(msk->pm.add_addr_accepted);
878 info->mptcpi_local_addr_used = READ_ONCE(msk->pm.local_addr_used);
879 info->mptcpi_subflows_max = mptcp_pm_get_subflows_max(msk);
880 val = mptcp_pm_get_add_addr_signal_max(msk);
881 info->mptcpi_add_addr_signal_max = val;
882 val = mptcp_pm_get_add_addr_accept_max(msk);
883 info->mptcpi_add_addr_accepted_max = val;
884 info->mptcpi_local_addr_max = mptcp_pm_get_local_addr_max(msk);
885 if (test_bit(MPTCP_FALLBACK_DONE, &msk->flags))
886 flags |= MPTCP_INFO_FLAG_FALLBACK;
887 if (READ_ONCE(msk->can_ack))
888 flags |= MPTCP_INFO_FLAG_REMOTE_KEY_RECEIVED;
889 info->mptcpi_flags = flags;
890 info->mptcpi_token = READ_ONCE(msk->token);
891 info->mptcpi_write_seq = READ_ONCE(msk->write_seq);
892 info->mptcpi_snd_una = READ_ONCE(msk->snd_una);
893 info->mptcpi_rcv_nxt = READ_ONCE(msk->ack_seq);
894 info->mptcpi_csum_enabled = READ_ONCE(msk->csum_enabled);
61bc6e82
FW		 895}
896EXPORT_SYMBOL_GPL(mptcp_diag_fill_info);
897
55c42fa7
FW		 898static int mptcp_getsockopt_info(struct mptcp_sock *msk, char __user *optval, int __user *optlen)
899{
900 struct mptcp_info m_info;
901 int len;
902
903 if (get_user(len, optlen))
904 return -EFAULT;
905
906 len = min_t(unsigned int, len, sizeof(struct mptcp_info));
907
908 mptcp_diag_fill_info(msk, &m_info);
909
910 if (put_user(len, optlen))
911 return -EFAULT;
912
913 if (copy_to_user(optval, &m_info, len))
914 return -EFAULT;
915
916 return 0;
917}
918
06f15cee
FW		 919static int mptcp_put_subflow_data(struct mptcp_subflow_data *sfd,
920 char __user *optval,
921 u32 copied,
922 int __user *optlen)
923{
924 u32 copylen = min_t(u32, sfd->size_subflow_data, sizeof(*sfd));
925
926 if (copied)
927 copied += sfd->size_subflow_data;
928 else
929 copied = copylen;
930
931 if (put_user(copied, optlen))
932 return -EFAULT;
933
934 if (copy_to_user(optval, sfd, copylen))
935 return -EFAULT;
936
937 return 0;
938}
939
940static int mptcp_get_subflow_data(struct mptcp_subflow_data *sfd,
941 char __user *optval, int __user *optlen)
942{
943 int len, copylen;
944
945 if (get_user(len, optlen))
946 return -EFAULT;
947
948 /* if mptcp_subflow_data size is changed, need to adjust
949 * this function to deal with programs using old version.
950 */
951 BUILD_BUG_ON(sizeof(*sfd) != MIN_INFO_OPTLEN_SIZE);
952
953 if (len < MIN_INFO_OPTLEN_SIZE)
954 return -EINVAL;
955
956 memset(sfd, 0, sizeof(*sfd));
957
958 copylen = min_t(unsigned int, len, sizeof(*sfd));
959 if (copy_from_user(sfd, optval, copylen))
960 return -EFAULT;
961
962 /* size_subflow_data is u32, but len is signed */
963 if (sfd->size_subflow_data > INT_MAX ||
964 sfd->size_user > INT_MAX)
965 return -EINVAL;
966
967 if (sfd->size_subflow_data < MIN_INFO_OPTLEN_SIZE ||
968 sfd->size_subflow_data > len)
969 return -EINVAL;
970
971 if (sfd->num_subflows || sfd->size_kernel)
972 return -EINVAL;
973
974 return len - sfd->size_subflow_data;
975}
976
977static int mptcp_getsockopt_tcpinfo(struct mptcp_sock *msk, char __user *optval,
978 int __user *optlen)
979{
980 struct mptcp_subflow_context *subflow;
981 struct sock *sk = &msk->sk.icsk_inet.sk;
982 unsigned int sfcount = 0, copied = 0;
983 struct mptcp_subflow_data sfd;
984 char __user *infoptr;
985 int len;
986
987 len = mptcp_get_subflow_data(&sfd, optval, optlen);
988 if (len < 0)
989 return len;
990
991 sfd.size_kernel = sizeof(struct tcp_info);
992 sfd.size_user = min_t(unsigned int, sfd.size_user,
993 sizeof(struct tcp_info));
994
995 infoptr = optval + sfd.size_subflow_data;
996
997 lock_sock(sk);
998
999 mptcp_for_each_subflow(msk, subflow) {
1000 struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
1001
1002 ++sfcount;
1003
1004 if (len && len >= sfd.size_user) {
1005 struct tcp_info info;
1006
1007 tcp_get_info(ssk, &info);
1008
1009 if (copy_to_user(infoptr, &info, sfd.size_user)) {
1010 release_sock(sk);
1011 return -EFAULT;
1012 }
1013
1014 infoptr += sfd.size_user;
1015 copied += sfd.size_user;
1016 len -= sfd.size_user;
1017 }
1018 }
1019
1020 release_sock(sk);
1021
1022 sfd.num_subflows = sfcount;
1023
1024 if (mptcp_put_subflow_data(&sfd, optval, copied, optlen))
1025 return -EFAULT;
1026
1027 return 0;
1028}
1029
c11c5906
FW		 1030static void mptcp_get_sub_addrs(const struct sock *sk, struct mptcp_subflow_addrs *a)
1031{
1032 struct inet_sock *inet = inet_sk(sk);
1033
1034 memset(a, 0, sizeof(*a));
1035
1036 if (sk->sk_family == AF_INET) {
1037 a->sin_local.sin_family = AF_INET;
1038 a->sin_local.sin_port = inet->inet_sport;
1039 a->sin_local.sin_addr.s_addr = inet->inet_rcv_saddr;
1040
1041 if (!a->sin_local.sin_addr.s_addr)
1042 a->sin_local.sin_addr.s_addr = inet->inet_saddr;
1043
1044 a->sin_remote.sin_family = AF_INET;
1045 a->sin_remote.sin_port = inet->inet_dport;
1046 a->sin_remote.sin_addr.s_addr = inet->inet_daddr;
1047#if IS_ENABLED(CONFIG_IPV6)
1048 } else if (sk->sk_family == AF_INET6) {
1049 const struct ipv6_pinfo *np = inet6_sk(sk);
1050
29211e7d
TG		 1051 if (WARN_ON_ONCE(!np))
1052 return;
1053
c11c5906
FW		 1054 a->sin6_local.sin6_family = AF_INET6;
1055 a->sin6_local.sin6_port = inet->inet_sport;
1056
1057 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr))
1058 a->sin6_local.sin6_addr = np->saddr;
1059 else
1060 a->sin6_local.sin6_addr = sk->sk_v6_rcv_saddr;
1061
1062 a->sin6_remote.sin6_family = AF_INET6;
1063 a->sin6_remote.sin6_port = inet->inet_dport;
1064 a->sin6_remote.sin6_addr = sk->sk_v6_daddr;
1065#endif
1066 }
1067}
1068
1069static int mptcp_getsockopt_subflow_addrs(struct mptcp_sock *msk, char __user *optval,
1070 int __user *optlen)
1071{
1072 struct sock *sk = &msk->sk.icsk_inet.sk;
1073 struct mptcp_subflow_context *subflow;
1074 unsigned int sfcount = 0, copied = 0;
1075 struct mptcp_subflow_data sfd;
1076 char __user *addrptr;
1077 int len;
1078
1079 len = mptcp_get_subflow_data(&sfd, optval, optlen);
1080 if (len < 0)
1081 return len;
1082
1083 sfd.size_kernel = sizeof(struct mptcp_subflow_addrs);
1084 sfd.size_user = min_t(unsigned int, sfd.size_user,
1085 sizeof(struct mptcp_subflow_addrs));
1086
1087 addrptr = optval + sfd.size_subflow_data;
1088
1089 lock_sock(sk);
1090
1091 mptcp_for_each_subflow(msk, subflow) {
1092 struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
1093
1094 ++sfcount;
1095
1096 if (len && len >= sfd.size_user) {
1097 struct mptcp_subflow_addrs a;
1098
1099 mptcp_get_sub_addrs(ssk, &a);
1100
1101 if (copy_to_user(addrptr, &a, sfd.size_user)) {
1102 release_sock(sk);
1103 return -EFAULT;
1104 }
1105
1106 addrptr += sfd.size_user;
1107 copied += sfd.size_user;
1108 len -= sfd.size_user;
1109 }
1110 }
1111
1112 release_sock(sk);
1113
1114 sfd.num_subflows = sfcount;
1115
1116 if (mptcp_put_subflow_data(&sfd, optval, copied, optlen))
1117 return -EFAULT;
1118
1119 return 0;
1120}
1121
2c9e7765
FW		 1122static int mptcp_put_int_option(struct mptcp_sock *msk, char __user *optval,
1123 int __user *optlen, int val)
1124{
1125 int len;
1126
1127 if (get_user(len, optlen))
1128 return -EFAULT;
2c9e7765
FW		 1129 if (len < 0)
1130 return -EINVAL;
1131
3b1e21eb
FW		 1132 if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) {
1133 unsigned char ucval = (unsigned char)val;
1134
1135 len = 1;
1136 if (put_user(len, optlen))
1137 return -EFAULT;
1138 if (copy_to_user(optval, &ucval, 1))
1139 return -EFAULT;
1140 } else {
1141 len = min_t(unsigned int, len, sizeof(int));
1142 if (put_user(len, optlen))
1143 return -EFAULT;
1144 if (copy_to_user(optval, &val, len))
1145 return -EFAULT;
1146 }
2c9e7765
FW		 1147
1148 return 0;
1149}
1150
aa1fbd94
FW		 1151static int mptcp_getsockopt_sol_tcp(struct mptcp_sock *msk, int optname,
1152 char __user *optval, int __user *optlen)
1153{
1154 switch (optname) {
1155 case TCP_ULP:
1156 case TCP_CONGESTION:
1157 case TCP_INFO:
1158 case TCP_CC_INFO:
ea1e301d 1159 case TCP_DEFER_ACCEPT:
aa1fbd94
FW		 1160 return mptcp_getsockopt_first_sf_only(msk, SOL_TCP, optname,
1161 optval, optlen);
2c9e7765
FW		 1162 case TCP_INQ:
1163 return mptcp_put_int_option(msk, optval, optlen, msk->recvmsg_inq);
4f6e14bd
MG		 1164 case TCP_CORK:
1165 return mptcp_put_int_option(msk, optval, optlen, msk->cork);
1166 case TCP_NODELAY:
1167 return mptcp_put_int_option(msk, optval, optlen, msk->nodelay);
aa1fbd94 1168 }
0abdde82
PA		 1169 return -EOPNOTSUPP;
1170}
1171
3b1e21eb
FW		 1172static int mptcp_getsockopt_v4(struct mptcp_sock *msk, int optname,
1173 char __user *optval, int __user *optlen)
1174{
1175 struct sock *sk = (void *)msk;
1176
1177 switch (optname) {
1178 case IP_TOS:
1179 return mptcp_put_int_option(msk, optval, optlen, inet_sk(sk)->tos);
1180 }
1181
1182 return -EOPNOTSUPP;
1183}
1184
55c42fa7
FW		 1185static int mptcp_getsockopt_sol_mptcp(struct mptcp_sock *msk, int optname,
1186 char __user *optval, int __user *optlen)
1187{
1188 switch (optname) {
1189 case MPTCP_INFO:
1190 return mptcp_getsockopt_info(msk, optval, optlen);
06f15cee
FW		 1191 case MPTCP_TCPINFO:
1192 return mptcp_getsockopt_tcpinfo(msk, optval, optlen);
c11c5906
FW		 1193 case MPTCP_SUBFLOW_ADDRS:
1194 return mptcp_getsockopt_subflow_addrs(msk, optval, optlen);
55c42fa7
FW		 1195 }
1196
1197 return -EOPNOTSUPP;
1198}
1199
0abdde82
PA		 1200int mptcp_getsockopt(struct sock *sk, int level, int optname,
1201 char __user *optval, int __user *option)
1202{
1203 struct mptcp_sock *msk = mptcp_sk(sk);
1204 struct sock *ssk;
1205
1206 pr_debug("msk=%p", msk);
1207
1208 /* @@ the meaning of setsockopt() when the socket is connected and
1209 * there are multiple subflows is not yet defined. It is up to the
1210 * MPTCP-level socket to configure the subflows until the subflow
1211 * is in TCP fallback, when socket options are passed through
1212 * to the one remaining subflow.
1213 */
1214 lock_sock(sk);
1215 ssk = __mptcp_tcp_fallback(msk);
1216 release_sock(sk);
1217 if (ssk)
1218 return tcp_getsockopt(ssk, level, optname, optval, option);
1219
3b1e21eb
FW		 1220 if (level == SOL_IP)
1221 return mptcp_getsockopt_v4(msk, optname, optval, option);
aa1fbd94
FW		 1222 if (level == SOL_TCP)
1223 return mptcp_getsockopt_sol_tcp(msk, optname, optval, option);
55c42fa7
FW		 1224 if (level == SOL_MPTCP)
1225 return mptcp_getsockopt_sol_mptcp(msk, optname, optval, option);
0abdde82
PA		 1226 return -EOPNOTSUPP;
1227}
1228
1b3e7ede
FW		 1229static void sync_socket_options(struct mptcp_sock *msk, struct sock *ssk)
1230{
5d0a6bc8 1231 static const unsigned int tx_rx_locks = SOCK_RCVBUF_LOCK | SOCK_SNDBUF_LOCK;
1b3e7ede
FW		 1232 struct sock *sk = (struct sock *)msk;
1233
1234 if (ssk->sk_prot->keepalive) {
1235 if (sock_flag(sk, SOCK_KEEPOPEN))
1236 ssk->sk_prot->keepalive(ssk, 1);
1237 else
1238 ssk->sk_prot->keepalive(ssk, 0);
1239 }
1240
1241 ssk->sk_priority = sk->sk_priority;
5d0a6bc8
FW		 1242 ssk->sk_bound_dev_if = sk->sk_bound_dev_if;
1243 ssk->sk_incoming_cpu = sk->sk_incoming_cpu;
ffcacff8 1244 __ip_sock_set_tos(ssk, inet_sk(sk)->tos);
5d0a6bc8
FW		 1245
1246 if (sk->sk_userlocks & tx_rx_locks) {
1247 ssk->sk_userlocks |= sk->sk_userlocks & tx_rx_locks;
1248 if (sk->sk_userlocks & SOCK_SNDBUF_LOCK)
1249 WRITE_ONCE(ssk->sk_sndbuf, sk->sk_sndbuf);
1250 if (sk->sk_userlocks & SOCK_RCVBUF_LOCK)
1251 WRITE_ONCE(ssk->sk_rcvbuf, sk->sk_rcvbuf);
1252 }
1253
1254 if (sock_flag(sk, SOCK_LINGER)) {
1255 ssk->sk_lingertime = sk->sk_lingertime;
1256 sock_set_flag(ssk, SOCK_LINGER);
1257 } else {
1258 sock_reset_flag(ssk, SOCK_LINGER);
1259 }
1260
1261 if (sk->sk_mark != ssk->sk_mark) {
1262 ssk->sk_mark = sk->sk_mark;
1263 sk_dst_reset(ssk);
1264 }
1265
1266 sock_valbool_flag(ssk, SOCK_DBG, sock_flag(sk, SOCK_DBG));
1267
1268 if (inet_csk(sk)->icsk_ca_ops != inet_csk(ssk)->icsk_ca_ops)
20b5759f 1269 tcp_set_congestion_control(ssk, msk->ca_name, false, true);
4f6e14bd
MG		 1270 __tcp_sock_set_cork(ssk, !!msk->cork);
1271 __tcp_sock_set_nodelay(ssk, !!msk->nodelay);
c9406a23
FW		 1272
1273 inet_sk(ssk)->transparent = inet_sk(sk)->transparent;
1274 inet_sk(ssk)->freebind = inet_sk(sk)->freebind;
1b3e7ede
FW		 1275}
1276
df00b087
FW		 1277static void __mptcp_sockopt_sync(struct mptcp_sock *msk, struct sock *ssk)
1278{
1b3e7ede
FW		 1279 bool slow = lock_sock_fast(ssk);
1280
1281 sync_socket_options(msk, ssk);
1282
1283 unlock_sock_fast(ssk, slow);
df00b087
FW		 1284}
1285
78962489
FW		 1286void mptcp_sockopt_sync(struct mptcp_sock *msk, struct sock *ssk)
1287{
df00b087
FW		 1288 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk);
1289
78962489 1290 msk_owned_by_me(msk);
df00b087
FW		 1291
1292 if (READ_ONCE(subflow->setsockopt_seq) != msk->setsockopt_seq) {
1293 __mptcp_sockopt_sync(msk, ssk);
1294
1295 subflow->setsockopt_seq = msk->setsockopt_seq;
1296 }
78962489
FW		 1297}
1298
3e501490 1299void mptcp_sockopt_sync_locked(struct mptcp_sock *msk, struct sock *ssk)
78962489 1300{
3e501490 1301 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk);
78962489 1302
3e501490 1303 msk_owned_by_me(msk);
78962489 1304
3e501490
PA		 1305 if (READ_ONCE(subflow->setsockopt_seq) != msk->setsockopt_seq) {
1306 sync_socket_options(msk, ssk);
78962489 1307
3e501490 1308 subflow->setsockopt_seq = msk->setsockopt_seq;
78962489
FW		 1309 }
1310}
Linux 6.x block layer and io_uring tree(s)