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Merge tag 'media/v4.9-3' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab...
[mirror_ubuntu-bionic-kernel.git] / net / ipv6 / udp.c
1 /*
2 * UDP over IPv6
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * Based on linux/ipv4/udp.c
9 *
10 * Fixes:
11 * Hideaki YOSHIFUJI : sin6_scope_id support
12 * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which
13 * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind
14 * a single port at the same time.
15 * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data
16 * YOSHIFUJI Hideaki @USAGI: convert /proc/net/udp6 to seq_file.
17 *
18 * This program is free software; you can redistribute it and/or
19 * modify it under the terms of the GNU General Public License
20 * as published by the Free Software Foundation; either version
21 * 2 of the License, or (at your option) any later version.
22 */
23
24 #include <linux/errno.h>
25 #include <linux/types.h>
26 #include <linux/socket.h>
27 #include <linux/sockios.h>
28 #include <linux/net.h>
29 #include <linux/in6.h>
30 #include <linux/netdevice.h>
31 #include <linux/if_arp.h>
32 #include <linux/ipv6.h>
33 #include <linux/icmpv6.h>
34 #include <linux/init.h>
35 #include <linux/module.h>
36 #include <linux/skbuff.h>
37 #include <linux/slab.h>
38 #include <asm/uaccess.h>
39
40 #include <net/addrconf.h>
41 #include <net/ndisc.h>
42 #include <net/protocol.h>
43 #include <net/transp_v6.h>
44 #include <net/ip6_route.h>
45 #include <net/raw.h>
46 #include <net/tcp_states.h>
47 #include <net/ip6_checksum.h>
48 #include <net/xfrm.h>
49 #include <net/inet6_hashtables.h>
50 #include <net/busy_poll.h>
51 #include <net/sock_reuseport.h>
52
53 #include <linux/proc_fs.h>
54 #include <linux/seq_file.h>
55 #include <trace/events/skb.h>
56 #include "udp_impl.h"
57
58 static u32 udp6_ehashfn(const struct net *net,
59 const struct in6_addr *laddr,
60 const u16 lport,
61 const struct in6_addr *faddr,
62 const __be16 fport)
63 {
64 static u32 udp6_ehash_secret __read_mostly;
65 static u32 udp_ipv6_hash_secret __read_mostly;
66
67 u32 lhash, fhash;
68
69 net_get_random_once(&udp6_ehash_secret,
70 sizeof(udp6_ehash_secret));
71 net_get_random_once(&udp_ipv6_hash_secret,
72 sizeof(udp_ipv6_hash_secret));
73
74 lhash = (__force u32)laddr->s6_addr32[3];
75 fhash = __ipv6_addr_jhash(faddr, udp_ipv6_hash_secret);
76
77 return __inet6_ehashfn(lhash, lport, fhash, fport,
78 udp_ipv6_hash_secret + net_hash_mix(net));
79 }
80
81 static u32 udp6_portaddr_hash(const struct net *net,
82 const struct in6_addr *addr6,
83 unsigned int port)
84 {
85 unsigned int hash, mix = net_hash_mix(net);
86
87 if (ipv6_addr_any(addr6))
88 hash = jhash_1word(0, mix);
89 else if (ipv6_addr_v4mapped(addr6))
90 hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix);
91 else
92 hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix);
93
94 return hash ^ port;
95 }
96
97 int udp_v6_get_port(struct sock *sk, unsigned short snum)
98 {
99 unsigned int hash2_nulladdr =
100 udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum);
101 unsigned int hash2_partial =
102 udp6_portaddr_hash(sock_net(sk), &sk->sk_v6_rcv_saddr, 0);
103
104 /* precompute partial secondary hash */
105 udp_sk(sk)->udp_portaddr_hash = hash2_partial;
106 return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal, hash2_nulladdr);
107 }
108
109 static void udp_v6_rehash(struct sock *sk)
110 {
111 u16 new_hash = udp6_portaddr_hash(sock_net(sk),
112 &sk->sk_v6_rcv_saddr,
113 inet_sk(sk)->inet_num);
114
115 udp_lib_rehash(sk, new_hash);
116 }
117
118 static int compute_score(struct sock *sk, struct net *net,
119 const struct in6_addr *saddr, __be16 sport,
120 const struct in6_addr *daddr, unsigned short hnum,
121 int dif)
122 {
123 int score;
124 struct inet_sock *inet;
125
126 if (!net_eq(sock_net(sk), net) ||
127 udp_sk(sk)->udp_port_hash != hnum ||
128 sk->sk_family != PF_INET6)
129 return -1;
130
131 score = 0;
132 inet = inet_sk(sk);
133
134 if (inet->inet_dport) {
135 if (inet->inet_dport != sport)
136 return -1;
137 score++;
138 }
139
140 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
141 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr))
142 return -1;
143 score++;
144 }
145
146 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
147 if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr))
148 return -1;
149 score++;
150 }
151
152 if (sk->sk_bound_dev_if) {
153 if (sk->sk_bound_dev_if != dif)
154 return -1;
155 score++;
156 }
157
158 if (sk->sk_incoming_cpu == raw_smp_processor_id())
159 score++;
160
161 return score;
162 }
163
164 /* called with rcu_read_lock() */
165 static struct sock *udp6_lib_lookup2(struct net *net,
166 const struct in6_addr *saddr, __be16 sport,
167 const struct in6_addr *daddr, unsigned int hnum, int dif,
168 struct udp_hslot *hslot2,
169 struct sk_buff *skb)
170 {
171 struct sock *sk, *result;
172 int score, badness, matches = 0, reuseport = 0;
173 u32 hash = 0;
174
175 result = NULL;
176 badness = -1;
177 udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) {
178 score = compute_score(sk, net, saddr, sport,
179 daddr, hnum, dif);
180 if (score > badness) {
181 reuseport = sk->sk_reuseport;
182 if (reuseport) {
183 hash = udp6_ehashfn(net, daddr, hnum,
184 saddr, sport);
185
186 result = reuseport_select_sock(sk, hash, skb,
187 sizeof(struct udphdr));
188 if (result)
189 return result;
190 matches = 1;
191 }
192 result = sk;
193 badness = score;
194 } else if (score == badness && reuseport) {
195 matches++;
196 if (reciprocal_scale(hash, matches) == 0)
197 result = sk;
198 hash = next_pseudo_random32(hash);
199 }
200 }
201 return result;
202 }
203
204 /* rcu_read_lock() must be held */
205 struct sock *__udp6_lib_lookup(struct net *net,
206 const struct in6_addr *saddr, __be16 sport,
207 const struct in6_addr *daddr, __be16 dport,
208 int dif, struct udp_table *udptable,
209 struct sk_buff *skb)
210 {
211 struct sock *sk, *result;
212 unsigned short hnum = ntohs(dport);
213 unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask);
214 struct udp_hslot *hslot2, *hslot = &udptable->hash[slot];
215 int score, badness, matches = 0, reuseport = 0;
216 u32 hash = 0;
217
218 if (hslot->count > 10) {
219 hash2 = udp6_portaddr_hash(net, daddr, hnum);
220 slot2 = hash2 & udptable->mask;
221 hslot2 = &udptable->hash2[slot2];
222 if (hslot->count < hslot2->count)
223 goto begin;
224
225 result = udp6_lib_lookup2(net, saddr, sport,
226 daddr, hnum, dif,
227 hslot2, skb);
228 if (!result) {
229 unsigned int old_slot2 = slot2;
230 hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum);
231 slot2 = hash2 & udptable->mask;
232 /* avoid searching the same slot again. */
233 if (unlikely(slot2 == old_slot2))
234 return result;
235
236 hslot2 = &udptable->hash2[slot2];
237 if (hslot->count < hslot2->count)
238 goto begin;
239
240 result = udp6_lib_lookup2(net, saddr, sport,
241 daddr, hnum, dif,
242 hslot2, skb);
243 }
244 return result;
245 }
246 begin:
247 result = NULL;
248 badness = -1;
249 sk_for_each_rcu(sk, &hslot->head) {
250 score = compute_score(sk, net, saddr, sport, daddr, hnum, dif);
251 if (score > badness) {
252 reuseport = sk->sk_reuseport;
253 if (reuseport) {
254 hash = udp6_ehashfn(net, daddr, hnum,
255 saddr, sport);
256 result = reuseport_select_sock(sk, hash, skb,
257 sizeof(struct udphdr));
258 if (result)
259 return result;
260 matches = 1;
261 }
262 result = sk;
263 badness = score;
264 } else if (score == badness && reuseport) {
265 matches++;
266 if (reciprocal_scale(hash, matches) == 0)
267 result = sk;
268 hash = next_pseudo_random32(hash);
269 }
270 }
271 return result;
272 }
273 EXPORT_SYMBOL_GPL(__udp6_lib_lookup);
274
275 static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb,
276 __be16 sport, __be16 dport,
277 struct udp_table *udptable)
278 {
279 const struct ipv6hdr *iph = ipv6_hdr(skb);
280 struct sock *sk;
281
282 sk = skb_steal_sock(skb);
283 if (unlikely(sk))
284 return sk;
285 return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport,
286 &iph->daddr, dport, inet6_iif(skb),
287 udptable, skb);
288 }
289
290 struct sock *udp6_lib_lookup_skb(struct sk_buff *skb,
291 __be16 sport, __be16 dport)
292 {
293 const struct ipv6hdr *iph = ipv6_hdr(skb);
294
295 return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport,
296 &iph->daddr, dport, inet6_iif(skb),
297 &udp_table, skb);
298 }
299 EXPORT_SYMBOL_GPL(udp6_lib_lookup_skb);
300
301 /* Must be called under rcu_read_lock().
302 * Does increment socket refcount.
303 */
304 #if IS_ENABLED(CONFIG_NETFILTER_XT_MATCH_SOCKET) || \
305 IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TPROXY)
306 struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport,
307 const struct in6_addr *daddr, __be16 dport, int dif)
308 {
309 struct sock *sk;
310
311 sk = __udp6_lib_lookup(net, saddr, sport, daddr, dport,
312 dif, &udp_table, NULL);
313 if (sk && !atomic_inc_not_zero(&sk->sk_refcnt))
314 sk = NULL;
315 return sk;
316 }
317 EXPORT_SYMBOL_GPL(udp6_lib_lookup);
318 #endif
319
320 /*
321 * This should be easy, if there is something there we
322 * return it, otherwise we block.
323 */
324
325 int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
326 int noblock, int flags, int *addr_len)
327 {
328 struct ipv6_pinfo *np = inet6_sk(sk);
329 struct inet_sock *inet = inet_sk(sk);
330 struct sk_buff *skb;
331 unsigned int ulen, copied;
332 int peeked, peeking, off;
333 int err;
334 int is_udplite = IS_UDPLITE(sk);
335 bool checksum_valid = false;
336 int is_udp4;
337 bool slow;
338
339 if (flags & MSG_ERRQUEUE)
340 return ipv6_recv_error(sk, msg, len, addr_len);
341
342 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
343 return ipv6_recv_rxpmtu(sk, msg, len, addr_len);
344
345 try_again:
346 peeking = off = sk_peek_offset(sk, flags);
347 skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),
348 &peeked, &off, &err);
349 if (!skb)
350 return err;
351
352 ulen = skb->len;
353 copied = len;
354 if (copied > ulen - off)
355 copied = ulen - off;
356 else if (copied < ulen)
357 msg->msg_flags |= MSG_TRUNC;
358
359 is_udp4 = (skb->protocol == htons(ETH_P_IP));
360
361 /*
362 * If checksum is needed at all, try to do it while copying the
363 * data. If the data is truncated, or if we only want a partial
364 * coverage checksum (UDP-Lite), do it before the copy.
365 */
366
367 if (copied < ulen || UDP_SKB_CB(skb)->partial_cov || peeking) {
368 checksum_valid = !udp_lib_checksum_complete(skb);
369 if (!checksum_valid)
370 goto csum_copy_err;
371 }
372
373 if (checksum_valid || skb_csum_unnecessary(skb))
374 err = skb_copy_datagram_msg(skb, off, msg, copied);
375 else {
376 err = skb_copy_and_csum_datagram_msg(skb, off, msg);
377 if (err == -EINVAL)
378 goto csum_copy_err;
379 }
380 if (unlikely(err)) {
381 trace_kfree_skb(skb, udpv6_recvmsg);
382 if (!peeked) {
383 atomic_inc(&sk->sk_drops);
384 if (is_udp4)
385 UDP_INC_STATS(sock_net(sk), UDP_MIB_INERRORS,
386 is_udplite);
387 else
388 UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS,
389 is_udplite);
390 }
391 skb_free_datagram_locked(sk, skb);
392 return err;
393 }
394 if (!peeked) {
395 if (is_udp4)
396 UDP_INC_STATS(sock_net(sk), UDP_MIB_INDATAGRAMS,
397 is_udplite);
398 else
399 UDP6_INC_STATS(sock_net(sk), UDP_MIB_INDATAGRAMS,
400 is_udplite);
401 }
402
403 sock_recv_ts_and_drops(msg, sk, skb);
404
405 /* Copy the address. */
406 if (msg->msg_name) {
407 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
408 sin6->sin6_family = AF_INET6;
409 sin6->sin6_port = udp_hdr(skb)->source;
410 sin6->sin6_flowinfo = 0;
411
412 if (is_udp4) {
413 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
414 &sin6->sin6_addr);
415 sin6->sin6_scope_id = 0;
416 } else {
417 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
418 sin6->sin6_scope_id =
419 ipv6_iface_scope_id(&sin6->sin6_addr,
420 inet6_iif(skb));
421 }
422 *addr_len = sizeof(*sin6);
423 }
424
425 if (np->rxopt.all)
426 ip6_datagram_recv_common_ctl(sk, msg, skb);
427
428 if (is_udp4) {
429 if (inet->cmsg_flags)
430 ip_cmsg_recv_offset(msg, skb,
431 sizeof(struct udphdr), off);
432 } else {
433 if (np->rxopt.all)
434 ip6_datagram_recv_specific_ctl(sk, msg, skb);
435 }
436
437 err = copied;
438 if (flags & MSG_TRUNC)
439 err = ulen;
440
441 __skb_free_datagram_locked(sk, skb, peeking ? -err : err);
442 return err;
443
444 csum_copy_err:
445 slow = lock_sock_fast(sk);
446 if (!skb_kill_datagram(sk, skb, flags)) {
447 if (is_udp4) {
448 UDP_INC_STATS(sock_net(sk),
449 UDP_MIB_CSUMERRORS, is_udplite);
450 UDP_INC_STATS(sock_net(sk),
451 UDP_MIB_INERRORS, is_udplite);
452 } else {
453 UDP6_INC_STATS(sock_net(sk),
454 UDP_MIB_CSUMERRORS, is_udplite);
455 UDP6_INC_STATS(sock_net(sk),
456 UDP_MIB_INERRORS, is_udplite);
457 }
458 }
459 unlock_sock_fast(sk, slow);
460
461 /* starting over for a new packet, but check if we need to yield */
462 cond_resched();
463 msg->msg_flags &= ~MSG_TRUNC;
464 goto try_again;
465 }
466
467 void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
468 u8 type, u8 code, int offset, __be32 info,
469 struct udp_table *udptable)
470 {
471 struct ipv6_pinfo *np;
472 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
473 const struct in6_addr *saddr = &hdr->saddr;
474 const struct in6_addr *daddr = &hdr->daddr;
475 struct udphdr *uh = (struct udphdr *)(skb->data+offset);
476 struct sock *sk;
477 int harderr;
478 int err;
479 struct net *net = dev_net(skb->dev);
480
481 sk = __udp6_lib_lookup(net, daddr, uh->dest, saddr, uh->source,
482 inet6_iif(skb), udptable, skb);
483 if (!sk) {
484 __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev),
485 ICMP6_MIB_INERRORS);
486 return;
487 }
488
489 harderr = icmpv6_err_convert(type, code, &err);
490 np = inet6_sk(sk);
491
492 if (type == ICMPV6_PKT_TOOBIG) {
493 if (!ip6_sk_accept_pmtu(sk))
494 goto out;
495 ip6_sk_update_pmtu(skb, sk, info);
496 if (np->pmtudisc != IPV6_PMTUDISC_DONT)
497 harderr = 1;
498 }
499 if (type == NDISC_REDIRECT) {
500 ip6_sk_redirect(skb, sk);
501 goto out;
502 }
503
504 if (!np->recverr) {
505 if (!harderr || sk->sk_state != TCP_ESTABLISHED)
506 goto out;
507 } else {
508 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
509 }
510
511 sk->sk_err = err;
512 sk->sk_error_report(sk);
513 out:
514 return;
515 }
516
517 static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
518 {
519 int rc;
520
521 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
522 sock_rps_save_rxhash(sk, skb);
523 sk_mark_napi_id(sk, skb);
524 sk_incoming_cpu_update(sk);
525 }
526
527 rc = __sock_queue_rcv_skb(sk, skb);
528 if (rc < 0) {
529 int is_udplite = IS_UDPLITE(sk);
530
531 /* Note that an ENOMEM error is charged twice */
532 if (rc == -ENOMEM)
533 UDP6_INC_STATS(sock_net(sk),
534 UDP_MIB_RCVBUFERRORS, is_udplite);
535 UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
536 kfree_skb(skb);
537 return -1;
538 }
539 return 0;
540 }
541
542 static __inline__ void udpv6_err(struct sk_buff *skb,
543 struct inet6_skb_parm *opt, u8 type,
544 u8 code, int offset, __be32 info)
545 {
546 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table);
547 }
548
549 static struct static_key udpv6_encap_needed __read_mostly;
550 void udpv6_encap_enable(void)
551 {
552 if (!static_key_enabled(&udpv6_encap_needed))
553 static_key_slow_inc(&udpv6_encap_needed);
554 }
555 EXPORT_SYMBOL(udpv6_encap_enable);
556
557 int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
558 {
559 struct udp_sock *up = udp_sk(sk);
560 int rc;
561 int is_udplite = IS_UDPLITE(sk);
562
563 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
564 goto drop;
565
566 if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
567 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
568
569 /*
570 * This is an encapsulation socket so pass the skb to
571 * the socket's udp_encap_rcv() hook. Otherwise, just
572 * fall through and pass this up the UDP socket.
573 * up->encap_rcv() returns the following value:
574 * =0 if skb was successfully passed to the encap
575 * handler or was discarded by it.
576 * >0 if skb should be passed on to UDP.
577 * <0 if skb should be resubmitted as proto -N
578 */
579
580 /* if we're overly short, let UDP handle it */
581 encap_rcv = ACCESS_ONCE(up->encap_rcv);
582 if (encap_rcv) {
583 int ret;
584
585 /* Verify checksum before giving to encap */
586 if (udp_lib_checksum_complete(skb))
587 goto csum_error;
588
589 ret = encap_rcv(sk, skb);
590 if (ret <= 0) {
591 __UDP_INC_STATS(sock_net(sk),
592 UDP_MIB_INDATAGRAMS,
593 is_udplite);
594 return -ret;
595 }
596 }
597
598 /* FALLTHROUGH -- it's a UDP Packet */
599 }
600
601 /*
602 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
603 */
604 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
605
606 if (up->pcrlen == 0) { /* full coverage was set */
607 net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n",
608 UDP_SKB_CB(skb)->cscov, skb->len);
609 goto drop;
610 }
611 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
612 net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n",
613 UDP_SKB_CB(skb)->cscov, up->pcrlen);
614 goto drop;
615 }
616 }
617
618 if (rcu_access_pointer(sk->sk_filter) &&
619 udp_lib_checksum_complete(skb))
620 goto csum_error;
621
622 if (sk_filter_trim_cap(sk, skb, sizeof(struct udphdr)))
623 goto drop;
624
625 udp_csum_pull_header(skb);
626 if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
627 __UDP6_INC_STATS(sock_net(sk),
628 UDP_MIB_RCVBUFERRORS, is_udplite);
629 goto drop;
630 }
631
632 skb_dst_drop(skb);
633
634 bh_lock_sock(sk);
635 rc = 0;
636 if (!sock_owned_by_user(sk))
637 rc = __udpv6_queue_rcv_skb(sk, skb);
638 else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
639 bh_unlock_sock(sk);
640 goto drop;
641 }
642 bh_unlock_sock(sk);
643
644 return rc;
645
646 csum_error:
647 __UDP6_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite);
648 drop:
649 __UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
650 atomic_inc(&sk->sk_drops);
651 kfree_skb(skb);
652 return -1;
653 }
654
655 static bool __udp_v6_is_mcast_sock(struct net *net, struct sock *sk,
656 __be16 loc_port, const struct in6_addr *loc_addr,
657 __be16 rmt_port, const struct in6_addr *rmt_addr,
658 int dif, unsigned short hnum)
659 {
660 struct inet_sock *inet = inet_sk(sk);
661
662 if (!net_eq(sock_net(sk), net))
663 return false;
664
665 if (udp_sk(sk)->udp_port_hash != hnum ||
666 sk->sk_family != PF_INET6 ||
667 (inet->inet_dport && inet->inet_dport != rmt_port) ||
668 (!ipv6_addr_any(&sk->sk_v6_daddr) &&
669 !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) ||
670 (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif) ||
671 (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) &&
672 !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr)))
673 return false;
674 if (!inet6_mc_check(sk, loc_addr, rmt_addr))
675 return false;
676 return true;
677 }
678
679 static void udp6_csum_zero_error(struct sk_buff *skb)
680 {
681 /* RFC 2460 section 8.1 says that we SHOULD log
682 * this error. Well, it is reasonable.
683 */
684 net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n",
685 &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source),
686 &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest));
687 }
688
689 /*
690 * Note: called only from the BH handler context,
691 * so we don't need to lock the hashes.
692 */
693 static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
694 const struct in6_addr *saddr, const struct in6_addr *daddr,
695 struct udp_table *udptable, int proto)
696 {
697 struct sock *sk, *first = NULL;
698 const struct udphdr *uh = udp_hdr(skb);
699 unsigned short hnum = ntohs(uh->dest);
700 struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum);
701 unsigned int offset = offsetof(typeof(*sk), sk_node);
702 unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10);
703 int dif = inet6_iif(skb);
704 struct hlist_node *node;
705 struct sk_buff *nskb;
706
707 if (use_hash2) {
708 hash2_any = udp6_portaddr_hash(net, &in6addr_any, hnum) &
709 udp_table.mask;
710 hash2 = udp6_portaddr_hash(net, daddr, hnum) & udp_table.mask;
711 start_lookup:
712 hslot = &udp_table.hash2[hash2];
713 offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node);
714 }
715
716 sk_for_each_entry_offset_rcu(sk, node, &hslot->head, offset) {
717 if (!__udp_v6_is_mcast_sock(net, sk, uh->dest, daddr,
718 uh->source, saddr, dif, hnum))
719 continue;
720 /* If zero checksum and no_check is not on for
721 * the socket then skip it.
722 */
723 if (!uh->check && !udp_sk(sk)->no_check6_rx)
724 continue;
725 if (!first) {
726 first = sk;
727 continue;
728 }
729 nskb = skb_clone(skb, GFP_ATOMIC);
730 if (unlikely(!nskb)) {
731 atomic_inc(&sk->sk_drops);
732 __UDP6_INC_STATS(net, UDP_MIB_RCVBUFERRORS,
733 IS_UDPLITE(sk));
734 __UDP6_INC_STATS(net, UDP_MIB_INERRORS,
735 IS_UDPLITE(sk));
736 continue;
737 }
738
739 if (udpv6_queue_rcv_skb(sk, nskb) > 0)
740 consume_skb(nskb);
741 }
742
743 /* Also lookup *:port if we are using hash2 and haven't done so yet. */
744 if (use_hash2 && hash2 != hash2_any) {
745 hash2 = hash2_any;
746 goto start_lookup;
747 }
748
749 if (first) {
750 if (udpv6_queue_rcv_skb(first, skb) > 0)
751 consume_skb(skb);
752 } else {
753 kfree_skb(skb);
754 __UDP6_INC_STATS(net, UDP_MIB_IGNOREDMULTI,
755 proto == IPPROTO_UDPLITE);
756 }
757 return 0;
758 }
759
760 int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
761 int proto)
762 {
763 const struct in6_addr *saddr, *daddr;
764 struct net *net = dev_net(skb->dev);
765 struct udphdr *uh;
766 struct sock *sk;
767 u32 ulen = 0;
768
769 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
770 goto discard;
771
772 saddr = &ipv6_hdr(skb)->saddr;
773 daddr = &ipv6_hdr(skb)->daddr;
774 uh = udp_hdr(skb);
775
776 ulen = ntohs(uh->len);
777 if (ulen > skb->len)
778 goto short_packet;
779
780 if (proto == IPPROTO_UDP) {
781 /* UDP validates ulen. */
782
783 /* Check for jumbo payload */
784 if (ulen == 0)
785 ulen = skb->len;
786
787 if (ulen < sizeof(*uh))
788 goto short_packet;
789
790 if (ulen < skb->len) {
791 if (pskb_trim_rcsum(skb, ulen))
792 goto short_packet;
793 saddr = &ipv6_hdr(skb)->saddr;
794 daddr = &ipv6_hdr(skb)->daddr;
795 uh = udp_hdr(skb);
796 }
797 }
798
799 if (udp6_csum_init(skb, uh, proto))
800 goto csum_error;
801
802 /*
803 * Multicast receive code
804 */
805 if (ipv6_addr_is_multicast(daddr))
806 return __udp6_lib_mcast_deliver(net, skb,
807 saddr, daddr, udptable, proto);
808
809 /* Unicast */
810
811 /*
812 * check socket cache ... must talk to Alan about his plans
813 * for sock caches... i'll skip this for now.
814 */
815 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
816 if (sk) {
817 int ret;
818
819 if (!uh->check && !udp_sk(sk)->no_check6_rx) {
820 udp6_csum_zero_error(skb);
821 goto csum_error;
822 }
823
824 if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk))
825 skb_checksum_try_convert(skb, IPPROTO_UDP, uh->check,
826 ip6_compute_pseudo);
827
828 ret = udpv6_queue_rcv_skb(sk, skb);
829
830 /* a return value > 0 means to resubmit the input */
831 if (ret > 0)
832 return ret;
833
834 return 0;
835 }
836
837 if (!uh->check) {
838 udp6_csum_zero_error(skb);
839 goto csum_error;
840 }
841
842 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
843 goto discard;
844
845 if (udp_lib_checksum_complete(skb))
846 goto csum_error;
847
848 __UDP6_INC_STATS(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
849 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
850
851 kfree_skb(skb);
852 return 0;
853
854 short_packet:
855 net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n",
856 proto == IPPROTO_UDPLITE ? "-Lite" : "",
857 saddr, ntohs(uh->source),
858 ulen, skb->len,
859 daddr, ntohs(uh->dest));
860 goto discard;
861 csum_error:
862 __UDP6_INC_STATS(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE);
863 discard:
864 __UDP6_INC_STATS(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
865 kfree_skb(skb);
866 return 0;
867 }
868
869 static __inline__ int udpv6_rcv(struct sk_buff *skb)
870 {
871 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP);
872 }
873
874 /*
875 * Throw away all pending data and cancel the corking. Socket is locked.
876 */
877 static void udp_v6_flush_pending_frames(struct sock *sk)
878 {
879 struct udp_sock *up = udp_sk(sk);
880
881 if (up->pending == AF_INET)
882 udp_flush_pending_frames(sk);
883 else if (up->pending) {
884 up->len = 0;
885 up->pending = 0;
886 ip6_flush_pending_frames(sk);
887 }
888 }
889
890 /**
891 * udp6_hwcsum_outgoing - handle outgoing HW checksumming
892 * @sk: socket we are sending on
893 * @skb: sk_buff containing the filled-in UDP header
894 * (checksum field must be zeroed out)
895 */
896 static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
897 const struct in6_addr *saddr,
898 const struct in6_addr *daddr, int len)
899 {
900 unsigned int offset;
901 struct udphdr *uh = udp_hdr(skb);
902 struct sk_buff *frags = skb_shinfo(skb)->frag_list;
903 __wsum csum = 0;
904
905 if (!frags) {
906 /* Only one fragment on the socket. */
907 skb->csum_start = skb_transport_header(skb) - skb->head;
908 skb->csum_offset = offsetof(struct udphdr, check);
909 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0);
910 } else {
911 /*
912 * HW-checksum won't work as there are two or more
913 * fragments on the socket so that all csums of sk_buffs
914 * should be together
915 */
916 offset = skb_transport_offset(skb);
917 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
918
919 skb->ip_summed = CHECKSUM_NONE;
920
921 do {
922 csum = csum_add(csum, frags->csum);
923 } while ((frags = frags->next));
924
925 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP,
926 csum);
927 if (uh->check == 0)
928 uh->check = CSUM_MANGLED_0;
929 }
930 }
931
932 /*
933 * Sending
934 */
935
936 static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6)
937 {
938 struct sock *sk = skb->sk;
939 struct udphdr *uh;
940 int err = 0;
941 int is_udplite = IS_UDPLITE(sk);
942 __wsum csum = 0;
943 int offset = skb_transport_offset(skb);
944 int len = skb->len - offset;
945
946 /*
947 * Create a UDP header
948 */
949 uh = udp_hdr(skb);
950 uh->source = fl6->fl6_sport;
951 uh->dest = fl6->fl6_dport;
952 uh->len = htons(len);
953 uh->check = 0;
954
955 if (is_udplite)
956 csum = udplite_csum(skb);
957 else if (udp_sk(sk)->no_check6_tx) { /* UDP csum disabled */
958 skb->ip_summed = CHECKSUM_NONE;
959 goto send;
960 } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
961 udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, len);
962 goto send;
963 } else
964 csum = udp_csum(skb);
965
966 /* add protocol-dependent pseudo-header */
967 uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
968 len, fl6->flowi6_proto, csum);
969 if (uh->check == 0)
970 uh->check = CSUM_MANGLED_0;
971
972 send:
973 err = ip6_send_skb(skb);
974 if (err) {
975 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) {
976 UDP6_INC_STATS(sock_net(sk),
977 UDP_MIB_SNDBUFERRORS, is_udplite);
978 err = 0;
979 }
980 } else {
981 UDP6_INC_STATS(sock_net(sk),
982 UDP_MIB_OUTDATAGRAMS, is_udplite);
983 }
984 return err;
985 }
986
987 static int udp_v6_push_pending_frames(struct sock *sk)
988 {
989 struct sk_buff *skb;
990 struct udp_sock *up = udp_sk(sk);
991 struct flowi6 fl6;
992 int err = 0;
993
994 if (up->pending == AF_INET)
995 return udp_push_pending_frames(sk);
996
997 /* ip6_finish_skb will release the cork, so make a copy of
998 * fl6 here.
999 */
1000 fl6 = inet_sk(sk)->cork.fl.u.ip6;
1001
1002 skb = ip6_finish_skb(sk);
1003 if (!skb)
1004 goto out;
1005
1006 err = udp_v6_send_skb(skb, &fl6);
1007
1008 out:
1009 up->len = 0;
1010 up->pending = 0;
1011 return err;
1012 }
1013
1014 int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
1015 {
1016 struct ipv6_txoptions opt_space;
1017 struct udp_sock *up = udp_sk(sk);
1018 struct inet_sock *inet = inet_sk(sk);
1019 struct ipv6_pinfo *np = inet6_sk(sk);
1020 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
1021 struct in6_addr *daddr, *final_p, final;
1022 struct ipv6_txoptions *opt = NULL;
1023 struct ipv6_txoptions *opt_to_free = NULL;
1024 struct ip6_flowlabel *flowlabel = NULL;
1025 struct flowi6 fl6;
1026 struct dst_entry *dst;
1027 struct ipcm6_cookie ipc6;
1028 int addr_len = msg->msg_namelen;
1029 int ulen = len;
1030 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
1031 int err;
1032 int connected = 0;
1033 int is_udplite = IS_UDPLITE(sk);
1034 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
1035 struct sockcm_cookie sockc;
1036
1037 ipc6.hlimit = -1;
1038 ipc6.tclass = -1;
1039 ipc6.dontfrag = -1;
1040
1041 /* destination address check */
1042 if (sin6) {
1043 if (addr_len < offsetof(struct sockaddr, sa_data))
1044 return -EINVAL;
1045
1046 switch (sin6->sin6_family) {
1047 case AF_INET6:
1048 if (addr_len < SIN6_LEN_RFC2133)
1049 return -EINVAL;
1050 daddr = &sin6->sin6_addr;
1051 break;
1052 case AF_INET:
1053 goto do_udp_sendmsg;
1054 case AF_UNSPEC:
1055 msg->msg_name = sin6 = NULL;
1056 msg->msg_namelen = addr_len = 0;
1057 daddr = NULL;
1058 break;
1059 default:
1060 return -EINVAL;
1061 }
1062 } else if (!up->pending) {
1063 if (sk->sk_state != TCP_ESTABLISHED)
1064 return -EDESTADDRREQ;
1065 daddr = &sk->sk_v6_daddr;
1066 } else
1067 daddr = NULL;
1068
1069 if (daddr) {
1070 if (ipv6_addr_v4mapped(daddr)) {
1071 struct sockaddr_in sin;
1072 sin.sin_family = AF_INET;
1073 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport;
1074 sin.sin_addr.s_addr = daddr->s6_addr32[3];
1075 msg->msg_name = &sin;
1076 msg->msg_namelen = sizeof(sin);
1077 do_udp_sendmsg:
1078 if (__ipv6_only_sock(sk))
1079 return -ENETUNREACH;
1080 return udp_sendmsg(sk, msg, len);
1081 }
1082 }
1083
1084 if (up->pending == AF_INET)
1085 return udp_sendmsg(sk, msg, len);
1086
1087 /* Rough check on arithmetic overflow,
1088 better check is made in ip6_append_data().
1089 */
1090 if (len > INT_MAX - sizeof(struct udphdr))
1091 return -EMSGSIZE;
1092
1093 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
1094 if (up->pending) {
1095 /*
1096 * There are pending frames.
1097 * The socket lock must be held while it's corked.
1098 */
1099 lock_sock(sk);
1100 if (likely(up->pending)) {
1101 if (unlikely(up->pending != AF_INET6)) {
1102 release_sock(sk);
1103 return -EAFNOSUPPORT;
1104 }
1105 dst = NULL;
1106 goto do_append_data;
1107 }
1108 release_sock(sk);
1109 }
1110 ulen += sizeof(struct udphdr);
1111
1112 memset(&fl6, 0, sizeof(fl6));
1113
1114 if (sin6) {
1115 if (sin6->sin6_port == 0)
1116 return -EINVAL;
1117
1118 fl6.fl6_dport = sin6->sin6_port;
1119 daddr = &sin6->sin6_addr;
1120
1121 if (np->sndflow) {
1122 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
1123 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
1124 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1125 if (!flowlabel)
1126 return -EINVAL;
1127 }
1128 }
1129
1130 /*
1131 * Otherwise it will be difficult to maintain
1132 * sk->sk_dst_cache.
1133 */
1134 if (sk->sk_state == TCP_ESTABLISHED &&
1135 ipv6_addr_equal(daddr, &sk->sk_v6_daddr))
1136 daddr = &sk->sk_v6_daddr;
1137
1138 if (addr_len >= sizeof(struct sockaddr_in6) &&
1139 sin6->sin6_scope_id &&
1140 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
1141 fl6.flowi6_oif = sin6->sin6_scope_id;
1142 } else {
1143 if (sk->sk_state != TCP_ESTABLISHED)
1144 return -EDESTADDRREQ;
1145
1146 fl6.fl6_dport = inet->inet_dport;
1147 daddr = &sk->sk_v6_daddr;
1148 fl6.flowlabel = np->flow_label;
1149 connected = 1;
1150 }
1151
1152 if (!fl6.flowi6_oif)
1153 fl6.flowi6_oif = sk->sk_bound_dev_if;
1154
1155 if (!fl6.flowi6_oif)
1156 fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex;
1157
1158 fl6.flowi6_mark = sk->sk_mark;
1159 sockc.tsflags = sk->sk_tsflags;
1160
1161 if (msg->msg_controllen) {
1162 opt = &opt_space;
1163 memset(opt, 0, sizeof(struct ipv6_txoptions));
1164 opt->tot_len = sizeof(*opt);
1165 ipc6.opt = opt;
1166
1167 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, &ipc6, &sockc);
1168 if (err < 0) {
1169 fl6_sock_release(flowlabel);
1170 return err;
1171 }
1172 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
1173 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1174 if (!flowlabel)
1175 return -EINVAL;
1176 }
1177 if (!(opt->opt_nflen|opt->opt_flen))
1178 opt = NULL;
1179 connected = 0;
1180 }
1181 if (!opt) {
1182 opt = txopt_get(np);
1183 opt_to_free = opt;
1184 }
1185 if (flowlabel)
1186 opt = fl6_merge_options(&opt_space, flowlabel, opt);
1187 opt = ipv6_fixup_options(&opt_space, opt);
1188 ipc6.opt = opt;
1189
1190 fl6.flowi6_proto = sk->sk_protocol;
1191 if (!ipv6_addr_any(daddr))
1192 fl6.daddr = *daddr;
1193 else
1194 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
1195 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
1196 fl6.saddr = np->saddr;
1197 fl6.fl6_sport = inet->inet_sport;
1198
1199 final_p = fl6_update_dst(&fl6, opt, &final);
1200 if (final_p)
1201 connected = 0;
1202
1203 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) {
1204 fl6.flowi6_oif = np->mcast_oif;
1205 connected = 0;
1206 } else if (!fl6.flowi6_oif)
1207 fl6.flowi6_oif = np->ucast_oif;
1208
1209 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
1210
1211 if (ipc6.tclass < 0)
1212 ipc6.tclass = np->tclass;
1213
1214 fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel);
1215
1216 dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p);
1217 if (IS_ERR(dst)) {
1218 err = PTR_ERR(dst);
1219 dst = NULL;
1220 goto out;
1221 }
1222
1223 if (ipc6.hlimit < 0)
1224 ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
1225
1226 if (msg->msg_flags&MSG_CONFIRM)
1227 goto do_confirm;
1228 back_from_confirm:
1229
1230 /* Lockless fast path for the non-corking case */
1231 if (!corkreq) {
1232 struct sk_buff *skb;
1233
1234 skb = ip6_make_skb(sk, getfrag, msg, ulen,
1235 sizeof(struct udphdr), &ipc6,
1236 &fl6, (struct rt6_info *)dst,
1237 msg->msg_flags, &sockc);
1238 err = PTR_ERR(skb);
1239 if (!IS_ERR_OR_NULL(skb))
1240 err = udp_v6_send_skb(skb, &fl6);
1241 goto release_dst;
1242 }
1243
1244 lock_sock(sk);
1245 if (unlikely(up->pending)) {
1246 /* The socket is already corked while preparing it. */
1247 /* ... which is an evident application bug. --ANK */
1248 release_sock(sk);
1249
1250 net_dbg_ratelimited("udp cork app bug 2\n");
1251 err = -EINVAL;
1252 goto out;
1253 }
1254
1255 up->pending = AF_INET6;
1256
1257 do_append_data:
1258 if (ipc6.dontfrag < 0)
1259 ipc6.dontfrag = np->dontfrag;
1260 up->len += ulen;
1261 err = ip6_append_data(sk, getfrag, msg, ulen, sizeof(struct udphdr),
1262 &ipc6, &fl6, (struct rt6_info *)dst,
1263 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, &sockc);
1264 if (err)
1265 udp_v6_flush_pending_frames(sk);
1266 else if (!corkreq)
1267 err = udp_v6_push_pending_frames(sk);
1268 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
1269 up->pending = 0;
1270
1271 if (err > 0)
1272 err = np->recverr ? net_xmit_errno(err) : 0;
1273 release_sock(sk);
1274
1275 release_dst:
1276 if (dst) {
1277 if (connected) {
1278 ip6_dst_store(sk, dst,
1279 ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ?
1280 &sk->sk_v6_daddr : NULL,
1281 #ifdef CONFIG_IPV6_SUBTREES
1282 ipv6_addr_equal(&fl6.saddr, &np->saddr) ?
1283 &np->saddr :
1284 #endif
1285 NULL);
1286 } else {
1287 dst_release(dst);
1288 }
1289 dst = NULL;
1290 }
1291
1292 out:
1293 dst_release(dst);
1294 fl6_sock_release(flowlabel);
1295 txopt_put(opt_to_free);
1296 if (!err)
1297 return len;
1298 /*
1299 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
1300 * ENOBUFS might not be good (it's not tunable per se), but otherwise
1301 * we don't have a good statistic (IpOutDiscards but it can be too many
1302 * things). We could add another new stat but at least for now that
1303 * seems like overkill.
1304 */
1305 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
1306 UDP6_INC_STATS(sock_net(sk),
1307 UDP_MIB_SNDBUFERRORS, is_udplite);
1308 }
1309 return err;
1310
1311 do_confirm:
1312 dst_confirm(dst);
1313 if (!(msg->msg_flags&MSG_PROBE) || len)
1314 goto back_from_confirm;
1315 err = 0;
1316 goto out;
1317 }
1318
1319 void udpv6_destroy_sock(struct sock *sk)
1320 {
1321 struct udp_sock *up = udp_sk(sk);
1322 lock_sock(sk);
1323 udp_v6_flush_pending_frames(sk);
1324 release_sock(sk);
1325
1326 if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
1327 void (*encap_destroy)(struct sock *sk);
1328 encap_destroy = ACCESS_ONCE(up->encap_destroy);
1329 if (encap_destroy)
1330 encap_destroy(sk);
1331 }
1332
1333 inet6_destroy_sock(sk);
1334 }
1335
1336 /*
1337 * Socket option code for UDP
1338 */
1339 int udpv6_setsockopt(struct sock *sk, int level, int optname,
1340 char __user *optval, unsigned int optlen)
1341 {
1342 if (level == SOL_UDP || level == SOL_UDPLITE)
1343 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1344 udp_v6_push_pending_frames);
1345 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1346 }
1347
1348 #ifdef CONFIG_COMPAT
1349 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
1350 char __user *optval, unsigned int optlen)
1351 {
1352 if (level == SOL_UDP || level == SOL_UDPLITE)
1353 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1354 udp_v6_push_pending_frames);
1355 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
1356 }
1357 #endif
1358
1359 int udpv6_getsockopt(struct sock *sk, int level, int optname,
1360 char __user *optval, int __user *optlen)
1361 {
1362 if (level == SOL_UDP || level == SOL_UDPLITE)
1363 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1364 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1365 }
1366
1367 #ifdef CONFIG_COMPAT
1368 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
1369 char __user *optval, int __user *optlen)
1370 {
1371 if (level == SOL_UDP || level == SOL_UDPLITE)
1372 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1373 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
1374 }
1375 #endif
1376
1377 static const struct inet6_protocol udpv6_protocol = {
1378 .handler = udpv6_rcv,
1379 .err_handler = udpv6_err,
1380 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1381 };
1382
1383 /* ------------------------------------------------------------------------ */
1384 #ifdef CONFIG_PROC_FS
1385 int udp6_seq_show(struct seq_file *seq, void *v)
1386 {
1387 if (v == SEQ_START_TOKEN) {
1388 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
1389 } else {
1390 int bucket = ((struct udp_iter_state *)seq->private)->bucket;
1391 struct inet_sock *inet = inet_sk(v);
1392 __u16 srcp = ntohs(inet->inet_sport);
1393 __u16 destp = ntohs(inet->inet_dport);
1394 ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket);
1395 }
1396 return 0;
1397 }
1398
1399 static const struct file_operations udp6_afinfo_seq_fops = {
1400 .owner = THIS_MODULE,
1401 .open = udp_seq_open,
1402 .read = seq_read,
1403 .llseek = seq_lseek,
1404 .release = seq_release_net
1405 };
1406
1407 static struct udp_seq_afinfo udp6_seq_afinfo = {
1408 .name = "udp6",
1409 .family = AF_INET6,
1410 .udp_table = &udp_table,
1411 .seq_fops = &udp6_afinfo_seq_fops,
1412 .seq_ops = {
1413 .show = udp6_seq_show,
1414 },
1415 };
1416
1417 int __net_init udp6_proc_init(struct net *net)
1418 {
1419 return udp_proc_register(net, &udp6_seq_afinfo);
1420 }
1421
1422 void udp6_proc_exit(struct net *net)
1423 {
1424 udp_proc_unregister(net, &udp6_seq_afinfo);
1425 }
1426 #endif /* CONFIG_PROC_FS */
1427
1428 /* ------------------------------------------------------------------------ */
1429
1430 struct proto udpv6_prot = {
1431 .name = "UDPv6",
1432 .owner = THIS_MODULE,
1433 .close = udp_lib_close,
1434 .connect = ip6_datagram_connect,
1435 .disconnect = udp_disconnect,
1436 .ioctl = udp_ioctl,
1437 .destroy = udpv6_destroy_sock,
1438 .setsockopt = udpv6_setsockopt,
1439 .getsockopt = udpv6_getsockopt,
1440 .sendmsg = udpv6_sendmsg,
1441 .recvmsg = udpv6_recvmsg,
1442 .backlog_rcv = __udpv6_queue_rcv_skb,
1443 .release_cb = ip6_datagram_release_cb,
1444 .hash = udp_lib_hash,
1445 .unhash = udp_lib_unhash,
1446 .rehash = udp_v6_rehash,
1447 .get_port = udp_v6_get_port,
1448 .memory_allocated = &udp_memory_allocated,
1449 .sysctl_mem = sysctl_udp_mem,
1450 .sysctl_wmem = &sysctl_udp_wmem_min,
1451 .sysctl_rmem = &sysctl_udp_rmem_min,
1452 .obj_size = sizeof(struct udp6_sock),
1453 .h.udp_table = &udp_table,
1454 #ifdef CONFIG_COMPAT
1455 .compat_setsockopt = compat_udpv6_setsockopt,
1456 .compat_getsockopt = compat_udpv6_getsockopt,
1457 #endif
1458 .diag_destroy = udp_abort,
1459 };
1460
1461 static struct inet_protosw udpv6_protosw = {
1462 .type = SOCK_DGRAM,
1463 .protocol = IPPROTO_UDP,
1464 .prot = &udpv6_prot,
1465 .ops = &inet6_dgram_ops,
1466 .flags = INET_PROTOSW_PERMANENT,
1467 };
1468
1469 int __init udpv6_init(void)
1470 {
1471 int ret;
1472
1473 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
1474 if (ret)
1475 goto out;
1476
1477 ret = inet6_register_protosw(&udpv6_protosw);
1478 if (ret)
1479 goto out_udpv6_protocol;
1480 out:
1481 return ret;
1482
1483 out_udpv6_protocol:
1484 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1485 goto out;
1486 }
1487
1488 void udpv6_exit(void)
1489 {
1490 inet6_unregister_protosw(&udpv6_protosw);
1491 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1492 }
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