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Merge tag 'usb-5.16-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb
[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:
346 case SO_BUSY_POLL:
347 case SO_PREFER_BUSY_POLL:
348 case SO_BUSY_POLL_BUDGET:
349 /* No need to copy: only relevant for msk */
350 return sock_setsockopt(sk->sk_socket, SOL_SOCKET, optname, optval, optlen);
a03c99b2
FW		 351 case SO_NO_CHECK:
352 case SO_DONTROUTE:
353 case SO_BROADCAST:
354 case SO_BSDCOMPAT:
355 case SO_PASSCRED:
356 case SO_PASSSEC:
357 case SO_RXQ_OVFL:
358 case SO_WIFI_STATUS:
359 case SO_NOFCS:
360 case SO_SELECT_ERR_QUEUE:
361 return 0;
0abdde82
PA		 362 }
363
7a009a70
FW		 364 /* SO_OOBINLINE is not supported, let's avoid the related mess
365 * SO_ATTACH_FILTER, SO_ATTACH_BPF, SO_ATTACH_REUSEPORT_CBPF,
366 * SO_DETACH_REUSEPORT_BPF, SO_DETACH_FILTER, SO_LOCK_FILTER,
367 * we must be careful with subflows
368 *
369 * SO_ATTACH_REUSEPORT_EBPF is not supported, at it checks
370 * explicitly the sk_protocol field
371 *
372 * SO_PEEK_OFF is unsupported, as it is for plain TCP
373 * SO_MAX_PACING_RATE is unsupported, we must be careful with subflows
374 * SO_CNX_ADVICE is currently unsupported, could possibly be relevant,
375 * but likely needs careful design
376 *
377 * SO_ZEROCOPY is currently unsupported, TODO in sndmsg
378 * SO_TXTIME is currently unsupported
379 */
380
381 return -EOPNOTSUPP;
0abdde82
PA		 382}
383
384static int mptcp_setsockopt_v6(struct mptcp_sock *msk, int optname,
385 sockptr_t optval, unsigned int optlen)
386{
387 struct sock *sk = (struct sock *)msk;
388 int ret = -EOPNOTSUPP;
389 struct socket *ssock;
390
391 switch (optname) {
392 case IPV6_V6ONLY:
393 lock_sock(sk);
394 ssock = __mptcp_nmpc_socket(msk);
395 if (!ssock) {
396 release_sock(sk);
397 return -EINVAL;
398 }
399
400 ret = tcp_setsockopt(ssock->sk, SOL_IPV6, optname, optval, optlen);
401 if (ret == 0)
402 sk->sk_ipv6only = ssock->sk->sk_ipv6only;
403
404 release_sock(sk);
405 break;
406 }
407
408 return ret;
409}
410
d9e4c129
PA		 411static bool mptcp_supported_sockopt(int level, int optname)
412{
d9e4c129
PA		 413 if (level == SOL_IP) {
414 switch (optname) {
415 /* should work fine */
416 case IP_FREEBIND:
417 case IP_TRANSPARENT:
418
419 /* the following are control cmsg related */
420 case IP_PKTINFO:
421 case IP_RECVTTL:
422 case IP_RECVTOS:
423 case IP_RECVOPTS:
424 case IP_RETOPTS:
425 case IP_PASSSEC:
426 case IP_RECVORIGDSTADDR:
427 case IP_CHECKSUM:
428 case IP_RECVFRAGSIZE:
429
430 /* common stuff that need some love */
431 case IP_TOS:
432 case IP_TTL:
433 case IP_BIND_ADDRESS_NO_PORT:
434 case IP_MTU_DISCOVER:
435 case IP_RECVERR:
436
437 /* possibly less common may deserve some love */
438 case IP_MINTTL:
439
440 /* the following is apparently a no-op for plain TCP */
441 case IP_RECVERR_RFC4884:
442 return true;
443 }
444
445 /* IP_OPTIONS is not supported, needs subflow care */
446 /* IP_HDRINCL, IP_NODEFRAG are not supported, RAW specific */
447 /* IP_MULTICAST_TTL, IP_MULTICAST_LOOP, IP_UNICAST_IF,
448 * IP_ADD_MEMBERSHIP, IP_ADD_SOURCE_MEMBERSHIP, IP_DROP_MEMBERSHIP,
449 * IP_DROP_SOURCE_MEMBERSHIP, IP_BLOCK_SOURCE, IP_UNBLOCK_SOURCE,
450 * MCAST_JOIN_GROUP, MCAST_LEAVE_GROUP MCAST_JOIN_SOURCE_GROUP,
451 * MCAST_LEAVE_SOURCE_GROUP, MCAST_BLOCK_SOURCE, MCAST_UNBLOCK_SOURCE,
452 * MCAST_MSFILTER, IP_MULTICAST_ALL are not supported, better not deal
453 * with mcast stuff
454 */
455 /* IP_IPSEC_POLICY, IP_XFRM_POLICY are nut supported, unrelated here */
456 return false;
457 }
458 if (level == SOL_IPV6) {
459 switch (optname) {
460 case IPV6_V6ONLY:
461
462 /* the following are control cmsg related */
463 case IPV6_RECVPKTINFO:
464 case IPV6_2292PKTINFO:
465 case IPV6_RECVHOPLIMIT:
466 case IPV6_2292HOPLIMIT:
467 case IPV6_RECVRTHDR:
468 case IPV6_2292RTHDR:
469 case IPV6_RECVHOPOPTS:
470 case IPV6_2292HOPOPTS:
471 case IPV6_RECVDSTOPTS:
472 case IPV6_2292DSTOPTS:
473 case IPV6_RECVTCLASS:
474 case IPV6_FLOWINFO:
475 case IPV6_RECVPATHMTU:
476 case IPV6_RECVORIGDSTADDR:
477 case IPV6_RECVFRAGSIZE:
478
479 /* the following ones need some love but are quite common */
480 case IPV6_TCLASS:
481 case IPV6_TRANSPARENT:
482 case IPV6_FREEBIND:
483 case IPV6_PKTINFO:
484 case IPV6_2292PKTOPTIONS:
485 case IPV6_UNICAST_HOPS:
486 case IPV6_MTU_DISCOVER:
487 case IPV6_MTU:
488 case IPV6_RECVERR:
489 case IPV6_FLOWINFO_SEND:
490 case IPV6_FLOWLABEL_MGR:
491 case IPV6_MINHOPCOUNT:
492 case IPV6_DONTFRAG:
493 case IPV6_AUTOFLOWLABEL:
494
495 /* the following one is a no-op for plain TCP */
496 case IPV6_RECVERR_RFC4884:
497 return true;
498 }
499
500 /* IPV6_HOPOPTS, IPV6_RTHDRDSTOPTS, IPV6_RTHDR, IPV6_DSTOPTS are
501 * not supported
502 */
503 /* IPV6_MULTICAST_HOPS, IPV6_MULTICAST_LOOP, IPV6_UNICAST_IF,
504 * IPV6_MULTICAST_IF, IPV6_ADDRFORM,
505 * IPV6_ADD_MEMBERSHIP, IPV6_DROP_MEMBERSHIP, IPV6_JOIN_ANYCAST,
506 * IPV6_LEAVE_ANYCAST, IPV6_MULTICAST_ALL, MCAST_JOIN_GROUP, MCAST_LEAVE_GROUP,
507 * MCAST_JOIN_SOURCE_GROUP, MCAST_LEAVE_SOURCE_GROUP,
508 * MCAST_BLOCK_SOURCE, MCAST_UNBLOCK_SOURCE, MCAST_MSFILTER
509 * are not supported better not deal with mcast
510 */
511 /* IPV6_ROUTER_ALERT, IPV6_ROUTER_ALERT_ISOLATE are not supported, since are evil */
512
513 /* IPV6_IPSEC_POLICY, IPV6_XFRM_POLICY are not supported */
514 /* IPV6_ADDR_PREFERENCES is not supported, we must be careful with subflows */
515 return false;
516 }
517 if (level == SOL_TCP) {
518 switch (optname) {
519 /* the following are no-op or should work just fine */
520 case TCP_THIN_DUPACK:
521 case TCP_DEFER_ACCEPT:
522
523 /* the following need some love */
524 case TCP_MAXSEG:
525 case TCP_NODELAY:
526 case TCP_THIN_LINEAR_TIMEOUTS:
527 case TCP_CONGESTION:
d9e4c129
PA		 528 case TCP_CORK:
529 case TCP_KEEPIDLE:
530 case TCP_KEEPINTVL:
531 case TCP_KEEPCNT:
532 case TCP_SYNCNT:
533 case TCP_SAVE_SYN:
534 case TCP_LINGER2:
535 case TCP_WINDOW_CLAMP:
536 case TCP_QUICKACK:
537 case TCP_USER_TIMEOUT:
538 case TCP_TIMESTAMP:
539 case TCP_NOTSENT_LOWAT:
540 case TCP_TX_DELAY:
541 return true;
542 }
543
544 /* TCP_MD5SIG, TCP_MD5SIG_EXT are not supported, MD5 is not compatible with MPTCP */
545
546 /* TCP_REPAIR, TCP_REPAIR_QUEUE, TCP_QUEUE_SEQ, TCP_REPAIR_OPTIONS,
547 * TCP_REPAIR_WINDOW are not supported, better avoid this mess
548 */
549 /* TCP_FASTOPEN_KEY, TCP_FASTOPEN TCP_FASTOPEN_CONNECT, TCP_FASTOPEN_NO_COOKIE,
550 * are not supported fastopen is currently unsupported
551 */
552 /* TCP_INQ is currently unsupported, needs some recvmsg work */
553 }
554 return false;
555}
556
aa1fbd94
FW		 557static int mptcp_setsockopt_sol_tcp_congestion(struct mptcp_sock *msk, sockptr_t optval,
558 unsigned int optlen)
559{
560 struct mptcp_subflow_context *subflow;
561 struct sock *sk = (struct sock *)msk;
562 char name[TCP_CA_NAME_MAX];
563 bool cap_net_admin;
564 int ret;
565
566 if (optlen < 1)
567 return -EINVAL;
568
569 ret = strncpy_from_sockptr(name, optval,
570 min_t(long, TCP_CA_NAME_MAX - 1, optlen));
571 if (ret < 0)
572 return -EFAULT;
573
574 name[ret] = 0;
575
576 cap_net_admin = ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN);
577
578 ret = 0;
579 lock_sock(sk);
580 sockopt_seq_inc(msk);
581 mptcp_for_each_subflow(msk, subflow) {
582 struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
583 int err;
584
585 lock_sock(ssk);
586 err = tcp_set_congestion_control(ssk, name, true, cap_net_admin);
587 if (err < 0 && ret == 0)
588 ret = err;
589 subflow->setsockopt_seq = msk->setsockopt_seq;
590 release_sock(ssk);
591 }
592
593 if (ret == 0)
20b5759f 594 strcpy(msk->ca_name, name);
aa1fbd94
FW		 595
596 release_sock(sk);
597 return ret;
598}
599
600static int mptcp_setsockopt_sol_tcp(struct mptcp_sock *msk, int optname,
601 sockptr_t optval, unsigned int optlen)
602{
603 switch (optname) {
604 case TCP_ULP:
605 return -EOPNOTSUPP;
606 case TCP_CONGESTION:
607 return mptcp_setsockopt_sol_tcp_congestion(msk, optval, optlen);
608 }
609
610 return -EOPNOTSUPP;
611}
612
0abdde82
PA		 613int mptcp_setsockopt(struct sock *sk, int level, int optname,
614 sockptr_t optval, unsigned int optlen)
615{
616 struct mptcp_sock *msk = mptcp_sk(sk);
617 struct sock *ssk;
618
619 pr_debug("msk=%p", msk);
620
621 if (level == SOL_SOCKET)
622 return mptcp_setsockopt_sol_socket(msk, optname, optval, optlen);
623
7a009a70
FW		 624 if (!mptcp_supported_sockopt(level, optname))
625 return -ENOPROTOOPT;
626
0abdde82
PA		 627 /* @@ the meaning of setsockopt() when the socket is connected and
628 * there are multiple subflows is not yet defined. It is up to the
629 * MPTCP-level socket to configure the subflows until the subflow
630 * is in TCP fallback, when TCP socket options are passed through
631 * to the one remaining subflow.
632 */
633 lock_sock(sk);
634 ssk = __mptcp_tcp_fallback(msk);
635 release_sock(sk);
636 if (ssk)
637 return tcp_setsockopt(ssk, level, optname, optval, optlen);
638
639 if (level == SOL_IPV6)
640 return mptcp_setsockopt_v6(msk, optname, optval, optlen);
641
aa1fbd94
FW		 642 if (level == SOL_TCP)
643 return mptcp_setsockopt_sol_tcp(msk, optname, optval, optlen);
644
645 return -EOPNOTSUPP;
646}
647
648static int mptcp_getsockopt_first_sf_only(struct mptcp_sock *msk, int level, int optname,
649 char __user *optval, int __user *optlen)
650{
651 struct sock *sk = (struct sock *)msk;
652 struct socket *ssock;
653 int ret = -EINVAL;
654 struct sock *ssk;
655
656 lock_sock(sk);
657 ssk = msk->first;
658 if (ssk) {
659 ret = tcp_getsockopt(ssk, level, optname, optval, optlen);
660 goto out;
661 }
662
663 ssock = __mptcp_nmpc_socket(msk);
664 if (!ssock)
665 goto out;
666
667 ret = tcp_getsockopt(ssock->sk, level, optname, optval, optlen);
668
669out:
670 release_sock(sk);
671 return ret;
672}
673
61bc6e82
FW		 674void mptcp_diag_fill_info(struct mptcp_sock *msk, struct mptcp_info *info)
675{
676 struct sock *sk = &msk->sk.icsk_inet.sk;
61bc6e82 677 u32 flags = 0;
55c42fa7 678 bool slow;
61bc6e82
FW		 679 u8 val;
680
55c42fa7
FW		 681 memset(info, 0, sizeof(*info));
682
683 slow = lock_sock_fast(sk);
684
61bc6e82
FW		 685 info->mptcpi_subflows = READ_ONCE(msk->pm.subflows);
686 info->mptcpi_add_addr_signal = READ_ONCE(msk->pm.add_addr_signaled);
687 info->mptcpi_add_addr_accepted = READ_ONCE(msk->pm.add_addr_accepted);
688 info->mptcpi_local_addr_used = READ_ONCE(msk->pm.local_addr_used);
689 info->mptcpi_subflows_max = mptcp_pm_get_subflows_max(msk);
690 val = mptcp_pm_get_add_addr_signal_max(msk);
691 info->mptcpi_add_addr_signal_max = val;
692 val = mptcp_pm_get_add_addr_accept_max(msk);
693 info->mptcpi_add_addr_accepted_max = val;
694 info->mptcpi_local_addr_max = mptcp_pm_get_local_addr_max(msk);
695 if (test_bit(MPTCP_FALLBACK_DONE, &msk->flags))
696 flags |= MPTCP_INFO_FLAG_FALLBACK;
697 if (READ_ONCE(msk->can_ack))
698 flags |= MPTCP_INFO_FLAG_REMOTE_KEY_RECEIVED;
699 info->mptcpi_flags = flags;
700 info->mptcpi_token = READ_ONCE(msk->token);
701 info->mptcpi_write_seq = READ_ONCE(msk->write_seq);
702 info->mptcpi_snd_una = READ_ONCE(msk->snd_una);
703 info->mptcpi_rcv_nxt = READ_ONCE(msk->ack_seq);
704 info->mptcpi_csum_enabled = READ_ONCE(msk->csum_enabled);
705
706 unlock_sock_fast(sk, slow);
707}
708EXPORT_SYMBOL_GPL(mptcp_diag_fill_info);
709
55c42fa7
FW		 710static int mptcp_getsockopt_info(struct mptcp_sock *msk, char __user *optval, int __user *optlen)
711{
712 struct mptcp_info m_info;
713 int len;
714
715 if (get_user(len, optlen))
716 return -EFAULT;
717
718 len = min_t(unsigned int, len, sizeof(struct mptcp_info));
719
720 mptcp_diag_fill_info(msk, &m_info);
721
722 if (put_user(len, optlen))
723 return -EFAULT;
724
725 if (copy_to_user(optval, &m_info, len))
726 return -EFAULT;
727
728 return 0;
729}
730
06f15cee
FW		 731static int mptcp_put_subflow_data(struct mptcp_subflow_data *sfd,
732 char __user *optval,
733 u32 copied,
734 int __user *optlen)
735{
736 u32 copylen = min_t(u32, sfd->size_subflow_data, sizeof(*sfd));
737
738 if (copied)
739 copied += sfd->size_subflow_data;
740 else
741 copied = copylen;
742
743 if (put_user(copied, optlen))
744 return -EFAULT;
745
746 if (copy_to_user(optval, sfd, copylen))
747 return -EFAULT;
748
749 return 0;
750}
751
752static int mptcp_get_subflow_data(struct mptcp_subflow_data *sfd,
753 char __user *optval, int __user *optlen)
754{
755 int len, copylen;
756
757 if (get_user(len, optlen))
758 return -EFAULT;
759
760 /* if mptcp_subflow_data size is changed, need to adjust
761 * this function to deal with programs using old version.
762 */
763 BUILD_BUG_ON(sizeof(*sfd) != MIN_INFO_OPTLEN_SIZE);
764
765 if (len < MIN_INFO_OPTLEN_SIZE)
766 return -EINVAL;
767
768 memset(sfd, 0, sizeof(*sfd));
769
770 copylen = min_t(unsigned int, len, sizeof(*sfd));
771 if (copy_from_user(sfd, optval, copylen))
772 return -EFAULT;
773
774 /* size_subflow_data is u32, but len is signed */
775 if (sfd->size_subflow_data > INT_MAX ||
776 sfd->size_user > INT_MAX)
777 return -EINVAL;
778
779 if (sfd->size_subflow_data < MIN_INFO_OPTLEN_SIZE ||
780 sfd->size_subflow_data > len)
781 return -EINVAL;
782
783 if (sfd->num_subflows || sfd->size_kernel)
784 return -EINVAL;
785
786 return len - sfd->size_subflow_data;
787}
788
789static int mptcp_getsockopt_tcpinfo(struct mptcp_sock *msk, char __user *optval,
790 int __user *optlen)
791{
792 struct mptcp_subflow_context *subflow;
793 struct sock *sk = &msk->sk.icsk_inet.sk;
794 unsigned int sfcount = 0, copied = 0;
795 struct mptcp_subflow_data sfd;
796 char __user *infoptr;
797 int len;
798
799 len = mptcp_get_subflow_data(&sfd, optval, optlen);
800 if (len < 0)
801 return len;
802
803 sfd.size_kernel = sizeof(struct tcp_info);
804 sfd.size_user = min_t(unsigned int, sfd.size_user,
805 sizeof(struct tcp_info));
806
807 infoptr = optval + sfd.size_subflow_data;
808
809 lock_sock(sk);
810
811 mptcp_for_each_subflow(msk, subflow) {
812 struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
813
814 ++sfcount;
815
816 if (len && len >= sfd.size_user) {
817 struct tcp_info info;
818
819 tcp_get_info(ssk, &info);
820
821 if (copy_to_user(infoptr, &info, sfd.size_user)) {
822 release_sock(sk);
823 return -EFAULT;
824 }
825
826 infoptr += sfd.size_user;
827 copied += sfd.size_user;
828 len -= sfd.size_user;
829 }
830 }
831
832 release_sock(sk);
833
834 sfd.num_subflows = sfcount;
835
836 if (mptcp_put_subflow_data(&sfd, optval, copied, optlen))
837 return -EFAULT;
838
839 return 0;
840}
841
c11c5906
FW		 842static void mptcp_get_sub_addrs(const struct sock *sk, struct mptcp_subflow_addrs *a)
843{
844 struct inet_sock *inet = inet_sk(sk);
845
846 memset(a, 0, sizeof(*a));
847
848 if (sk->sk_family == AF_INET) {
849 a->sin_local.sin_family = AF_INET;
850 a->sin_local.sin_port = inet->inet_sport;
851 a->sin_local.sin_addr.s_addr = inet->inet_rcv_saddr;
852
853 if (!a->sin_local.sin_addr.s_addr)
854 a->sin_local.sin_addr.s_addr = inet->inet_saddr;
855
856 a->sin_remote.sin_family = AF_INET;
857 a->sin_remote.sin_port = inet->inet_dport;
858 a->sin_remote.sin_addr.s_addr = inet->inet_daddr;
859#if IS_ENABLED(CONFIG_IPV6)
860 } else if (sk->sk_family == AF_INET6) {
861 const struct ipv6_pinfo *np = inet6_sk(sk);
862
29211e7d
TG		 863 if (WARN_ON_ONCE(!np))
864 return;
865
c11c5906
FW		 866 a->sin6_local.sin6_family = AF_INET6;
867 a->sin6_local.sin6_port = inet->inet_sport;
868
869 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr))
870 a->sin6_local.sin6_addr = np->saddr;
871 else
872 a->sin6_local.sin6_addr = sk->sk_v6_rcv_saddr;
873
874 a->sin6_remote.sin6_family = AF_INET6;
875 a->sin6_remote.sin6_port = inet->inet_dport;
876 a->sin6_remote.sin6_addr = sk->sk_v6_daddr;
877#endif
878 }
879}
880
881static int mptcp_getsockopt_subflow_addrs(struct mptcp_sock *msk, char __user *optval,
882 int __user *optlen)
883{
884 struct sock *sk = &msk->sk.icsk_inet.sk;
885 struct mptcp_subflow_context *subflow;
886 unsigned int sfcount = 0, copied = 0;
887 struct mptcp_subflow_data sfd;
888 char __user *addrptr;
889 int len;
890
891 len = mptcp_get_subflow_data(&sfd, optval, optlen);
892 if (len < 0)
893 return len;
894
895 sfd.size_kernel = sizeof(struct mptcp_subflow_addrs);
896 sfd.size_user = min_t(unsigned int, sfd.size_user,
897 sizeof(struct mptcp_subflow_addrs));
898
899 addrptr = optval + sfd.size_subflow_data;
900
901 lock_sock(sk);
902
903 mptcp_for_each_subflow(msk, subflow) {
904 struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
905
906 ++sfcount;
907
908 if (len && len >= sfd.size_user) {
909 struct mptcp_subflow_addrs a;
910
911 mptcp_get_sub_addrs(ssk, &a);
912
913 if (copy_to_user(addrptr, &a, sfd.size_user)) {
914 release_sock(sk);
915 return -EFAULT;
916 }
917
918 addrptr += sfd.size_user;
919 copied += sfd.size_user;
920 len -= sfd.size_user;
921 }
922 }
923
924 release_sock(sk);
925
926 sfd.num_subflows = sfcount;
927
928 if (mptcp_put_subflow_data(&sfd, optval, copied, optlen))
929 return -EFAULT;
930
931 return 0;
932}
933
aa1fbd94
FW		 934static int mptcp_getsockopt_sol_tcp(struct mptcp_sock *msk, int optname,
935 char __user *optval, int __user *optlen)
936{
937 switch (optname) {
938 case TCP_ULP:
939 case TCP_CONGESTION:
940 case TCP_INFO:
941 case TCP_CC_INFO:
942 return mptcp_getsockopt_first_sf_only(msk, SOL_TCP, optname,
943 optval, optlen);
944 }
0abdde82
PA		 945 return -EOPNOTSUPP;
946}
947
55c42fa7
FW		 948static int mptcp_getsockopt_sol_mptcp(struct mptcp_sock *msk, int optname,
949 char __user *optval, int __user *optlen)
950{
951 switch (optname) {
952 case MPTCP_INFO:
953 return mptcp_getsockopt_info(msk, optval, optlen);
06f15cee
FW		 954 case MPTCP_TCPINFO:
955 return mptcp_getsockopt_tcpinfo(msk, optval, optlen);
c11c5906
FW		 956 case MPTCP_SUBFLOW_ADDRS:
957 return mptcp_getsockopt_subflow_addrs(msk, optval, optlen);
55c42fa7
FW		 958 }
959
960 return -EOPNOTSUPP;
961}
962
0abdde82
PA		 963int mptcp_getsockopt(struct sock *sk, int level, int optname,
964 char __user *optval, int __user *option)
965{
966 struct mptcp_sock *msk = mptcp_sk(sk);
967 struct sock *ssk;
968
969 pr_debug("msk=%p", msk);
970
971 /* @@ the meaning of setsockopt() when the socket is connected and
972 * there are multiple subflows is not yet defined. It is up to the
973 * MPTCP-level socket to configure the subflows until the subflow
974 * is in TCP fallback, when socket options are passed through
975 * to the one remaining subflow.
976 */
977 lock_sock(sk);
978 ssk = __mptcp_tcp_fallback(msk);
979 release_sock(sk);
980 if (ssk)
981 return tcp_getsockopt(ssk, level, optname, optval, option);
982
aa1fbd94
FW		 983 if (level == SOL_TCP)
984 return mptcp_getsockopt_sol_tcp(msk, optname, optval, option);
55c42fa7
FW		 985 if (level == SOL_MPTCP)
986 return mptcp_getsockopt_sol_mptcp(msk, optname, optval, option);
0abdde82
PA		 987 return -EOPNOTSUPP;
988}
989
1b3e7ede
FW		 990static void sync_socket_options(struct mptcp_sock *msk, struct sock *ssk)
991{
5d0a6bc8 992 static const unsigned int tx_rx_locks = SOCK_RCVBUF_LOCK | SOCK_SNDBUF_LOCK;
1b3e7ede
FW		 993 struct sock *sk = (struct sock *)msk;
994
995 if (ssk->sk_prot->keepalive) {
996 if (sock_flag(sk, SOCK_KEEPOPEN))
997 ssk->sk_prot->keepalive(ssk, 1);
998 else
999 ssk->sk_prot->keepalive(ssk, 0);
1000 }
1001
1002 ssk->sk_priority = sk->sk_priority;
5d0a6bc8
FW		 1003 ssk->sk_bound_dev_if = sk->sk_bound_dev_if;
1004 ssk->sk_incoming_cpu = sk->sk_incoming_cpu;
1005
1006 if (sk->sk_userlocks & tx_rx_locks) {
1007 ssk->sk_userlocks |= sk->sk_userlocks & tx_rx_locks;
1008 if (sk->sk_userlocks & SOCK_SNDBUF_LOCK)
1009 WRITE_ONCE(ssk->sk_sndbuf, sk->sk_sndbuf);
1010 if (sk->sk_userlocks & SOCK_RCVBUF_LOCK)
1011 WRITE_ONCE(ssk->sk_rcvbuf, sk->sk_rcvbuf);
1012 }
1013
1014 if (sock_flag(sk, SOCK_LINGER)) {
1015 ssk->sk_lingertime = sk->sk_lingertime;
1016 sock_set_flag(ssk, SOCK_LINGER);
1017 } else {
1018 sock_reset_flag(ssk, SOCK_LINGER);
1019 }
1020
1021 if (sk->sk_mark != ssk->sk_mark) {
1022 ssk->sk_mark = sk->sk_mark;
1023 sk_dst_reset(ssk);
1024 }
1025
1026 sock_valbool_flag(ssk, SOCK_DBG, sock_flag(sk, SOCK_DBG));
1027
1028 if (inet_csk(sk)->icsk_ca_ops != inet_csk(ssk)->icsk_ca_ops)
20b5759f 1029 tcp_set_congestion_control(ssk, msk->ca_name, false, true);
1b3e7ede
FW		 1030}
1031
df00b087
FW		 1032static void __mptcp_sockopt_sync(struct mptcp_sock *msk, struct sock *ssk)
1033{
1b3e7ede
FW		 1034 bool slow = lock_sock_fast(ssk);
1035
1036 sync_socket_options(msk, ssk);
1037
1038 unlock_sock_fast(ssk, slow);
df00b087
FW		 1039}
1040
78962489
FW		 1041void mptcp_sockopt_sync(struct mptcp_sock *msk, struct sock *ssk)
1042{
df00b087
FW		 1043 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk);
1044
78962489 1045 msk_owned_by_me(msk);
df00b087
FW		 1046
1047 if (READ_ONCE(subflow->setsockopt_seq) != msk->setsockopt_seq) {
1048 __mptcp_sockopt_sync(msk, ssk);
1049
1050 subflow->setsockopt_seq = msk->setsockopt_seq;
1051 }
78962489
FW		 1052}
1053
1054void mptcp_sockopt_sync_all(struct mptcp_sock *msk)
1055{
1056 struct mptcp_subflow_context *subflow;
df00b087
FW		 1057 struct sock *sk = (struct sock *)msk;
1058 u32 seq;
78962489 1059
df00b087 1060 seq = sockopt_seq_reset(sk);
78962489
FW		 1061
1062 mptcp_for_each_subflow(msk, subflow) {
1063 struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
df00b087 1064 u32 sseq = READ_ONCE(subflow->setsockopt_seq);
78962489 1065
df00b087
FW		 1066 if (sseq != msk->setsockopt_seq) {
1067 __mptcp_sockopt_sync(msk, ssk);
1068 WRITE_ONCE(subflow->setsockopt_seq, seq);
1069 } else if (sseq != seq) {
1070 WRITE_ONCE(subflow->setsockopt_seq, seq);
1071 }
78962489
FW		 1072
1073 cond_resched();
1074 }
df00b087
FW		 1075
1076 msk->setsockopt_seq = seq;
78962489 1077}
Linux 6.x block layer and io_uring tree(s)