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Merge branch 'v4.13/sps' into v4.13/drivers
[mirror_ubuntu-artful-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 <linux/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/inet_hashtables.h>
50 #include <net/inet6_hashtables.h>
51 #include <net/busy_poll.h>
52 #include <net/sock_reuseport.h>
53
54 #include <linux/proc_fs.h>
55 #include <linux/seq_file.h>
56 #include <trace/events/skb.h>
57 #include "udp_impl.h"
58
59 static bool udp6_lib_exact_dif_match(struct net *net, struct sk_buff *skb)
60 {
61 #if defined(CONFIG_NET_L3_MASTER_DEV)
62 if (!net->ipv4.sysctl_udp_l3mdev_accept &&
63 skb && ipv6_l3mdev_skb(IP6CB(skb)->flags))
64 return true;
65 #endif
66 return false;
67 }
68
69 static u32 udp6_ehashfn(const struct net *net,
70 const struct in6_addr *laddr,
71 const u16 lport,
72 const struct in6_addr *faddr,
73 const __be16 fport)
74 {
75 static u32 udp6_ehash_secret __read_mostly;
76 static u32 udp_ipv6_hash_secret __read_mostly;
77
78 u32 lhash, fhash;
79
80 net_get_random_once(&udp6_ehash_secret,
81 sizeof(udp6_ehash_secret));
82 net_get_random_once(&udp_ipv6_hash_secret,
83 sizeof(udp_ipv6_hash_secret));
84
85 lhash = (__force u32)laddr->s6_addr32[3];
86 fhash = __ipv6_addr_jhash(faddr, udp_ipv6_hash_secret);
87
88 return __inet6_ehashfn(lhash, lport, fhash, fport,
89 udp_ipv6_hash_secret + net_hash_mix(net));
90 }
91
92 static u32 udp6_portaddr_hash(const struct net *net,
93 const struct in6_addr *addr6,
94 unsigned int port)
95 {
96 unsigned int hash, mix = net_hash_mix(net);
97
98 if (ipv6_addr_any(addr6))
99 hash = jhash_1word(0, mix);
100 else if (ipv6_addr_v4mapped(addr6))
101 hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix);
102 else
103 hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix);
104
105 return hash ^ port;
106 }
107
108 int udp_v6_get_port(struct sock *sk, unsigned short snum)
109 {
110 unsigned int hash2_nulladdr =
111 udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum);
112 unsigned int hash2_partial =
113 udp6_portaddr_hash(sock_net(sk), &sk->sk_v6_rcv_saddr, 0);
114
115 /* precompute partial secondary hash */
116 udp_sk(sk)->udp_portaddr_hash = hash2_partial;
117 return udp_lib_get_port(sk, snum, hash2_nulladdr);
118 }
119
120 static void udp_v6_rehash(struct sock *sk)
121 {
122 u16 new_hash = udp6_portaddr_hash(sock_net(sk),
123 &sk->sk_v6_rcv_saddr,
124 inet_sk(sk)->inet_num);
125
126 udp_lib_rehash(sk, new_hash);
127 }
128
129 static int compute_score(struct sock *sk, struct net *net,
130 const struct in6_addr *saddr, __be16 sport,
131 const struct in6_addr *daddr, unsigned short hnum,
132 int dif, bool exact_dif)
133 {
134 int score;
135 struct inet_sock *inet;
136
137 if (!net_eq(sock_net(sk), net) ||
138 udp_sk(sk)->udp_port_hash != hnum ||
139 sk->sk_family != PF_INET6)
140 return -1;
141
142 score = 0;
143 inet = inet_sk(sk);
144
145 if (inet->inet_dport) {
146 if (inet->inet_dport != sport)
147 return -1;
148 score++;
149 }
150
151 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
152 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr))
153 return -1;
154 score++;
155 }
156
157 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
158 if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr))
159 return -1;
160 score++;
161 }
162
163 if (sk->sk_bound_dev_if || exact_dif) {
164 if (sk->sk_bound_dev_if != dif)
165 return -1;
166 score++;
167 }
168
169 if (sk->sk_incoming_cpu == raw_smp_processor_id())
170 score++;
171
172 return score;
173 }
174
175 /* called with rcu_read_lock() */
176 static struct sock *udp6_lib_lookup2(struct net *net,
177 const struct in6_addr *saddr, __be16 sport,
178 const struct in6_addr *daddr, unsigned int hnum, int dif,
179 bool exact_dif, struct udp_hslot *hslot2,
180 struct sk_buff *skb)
181 {
182 struct sock *sk, *result;
183 int score, badness, matches = 0, reuseport = 0;
184 u32 hash = 0;
185
186 result = NULL;
187 badness = -1;
188 udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) {
189 score = compute_score(sk, net, saddr, sport,
190 daddr, hnum, dif, exact_dif);
191 if (score > badness) {
192 reuseport = sk->sk_reuseport;
193 if (reuseport) {
194 hash = udp6_ehashfn(net, daddr, hnum,
195 saddr, sport);
196
197 result = reuseport_select_sock(sk, hash, skb,
198 sizeof(struct udphdr));
199 if (result)
200 return result;
201 matches = 1;
202 }
203 result = sk;
204 badness = score;
205 } else if (score == badness && reuseport) {
206 matches++;
207 if (reciprocal_scale(hash, matches) == 0)
208 result = sk;
209 hash = next_pseudo_random32(hash);
210 }
211 }
212 return result;
213 }
214
215 /* rcu_read_lock() must be held */
216 struct sock *__udp6_lib_lookup(struct net *net,
217 const struct in6_addr *saddr, __be16 sport,
218 const struct in6_addr *daddr, __be16 dport,
219 int dif, struct udp_table *udptable,
220 struct sk_buff *skb)
221 {
222 struct sock *sk, *result;
223 unsigned short hnum = ntohs(dport);
224 unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask);
225 struct udp_hslot *hslot2, *hslot = &udptable->hash[slot];
226 bool exact_dif = udp6_lib_exact_dif_match(net, skb);
227 int score, badness, matches = 0, reuseport = 0;
228 u32 hash = 0;
229
230 if (hslot->count > 10) {
231 hash2 = udp6_portaddr_hash(net, daddr, hnum);
232 slot2 = hash2 & udptable->mask;
233 hslot2 = &udptable->hash2[slot2];
234 if (hslot->count < hslot2->count)
235 goto begin;
236
237 result = udp6_lib_lookup2(net, saddr, sport,
238 daddr, hnum, dif, exact_dif,
239 hslot2, skb);
240 if (!result) {
241 unsigned int old_slot2 = slot2;
242 hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum);
243 slot2 = hash2 & udptable->mask;
244 /* avoid searching the same slot again. */
245 if (unlikely(slot2 == old_slot2))
246 return result;
247
248 hslot2 = &udptable->hash2[slot2];
249 if (hslot->count < hslot2->count)
250 goto begin;
251
252 result = udp6_lib_lookup2(net, saddr, sport,
253 daddr, hnum, dif,
254 exact_dif, hslot2,
255 skb);
256 }
257 return result;
258 }
259 begin:
260 result = NULL;
261 badness = -1;
262 sk_for_each_rcu(sk, &hslot->head) {
263 score = compute_score(sk, net, saddr, sport, daddr, hnum, dif,
264 exact_dif);
265 if (score > badness) {
266 reuseport = sk->sk_reuseport;
267 if (reuseport) {
268 hash = udp6_ehashfn(net, daddr, hnum,
269 saddr, sport);
270 result = reuseport_select_sock(sk, hash, skb,
271 sizeof(struct udphdr));
272 if (result)
273 return result;
274 matches = 1;
275 }
276 result = sk;
277 badness = score;
278 } else if (score == badness && reuseport) {
279 matches++;
280 if (reciprocal_scale(hash, matches) == 0)
281 result = sk;
282 hash = next_pseudo_random32(hash);
283 }
284 }
285 return result;
286 }
287 EXPORT_SYMBOL_GPL(__udp6_lib_lookup);
288
289 static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb,
290 __be16 sport, __be16 dport,
291 struct udp_table *udptable)
292 {
293 const struct ipv6hdr *iph = ipv6_hdr(skb);
294 struct sock *sk;
295
296 sk = skb_steal_sock(skb);
297 if (unlikely(sk))
298 return sk;
299 return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport,
300 &iph->daddr, dport, inet6_iif(skb),
301 udptable, skb);
302 }
303
304 struct sock *udp6_lib_lookup_skb(struct sk_buff *skb,
305 __be16 sport, __be16 dport)
306 {
307 const struct ipv6hdr *iph = ipv6_hdr(skb);
308
309 return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport,
310 &iph->daddr, dport, inet6_iif(skb),
311 &udp_table, skb);
312 }
313 EXPORT_SYMBOL_GPL(udp6_lib_lookup_skb);
314
315 /* Must be called under rcu_read_lock().
316 * Does increment socket refcount.
317 */
318 #if IS_ENABLED(CONFIG_NETFILTER_XT_MATCH_SOCKET) || \
319 IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TPROXY) || \
320 IS_ENABLED(CONFIG_NF_SOCKET_IPV6)
321 struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport,
322 const struct in6_addr *daddr, __be16 dport, int dif)
323 {
324 struct sock *sk;
325
326 sk = __udp6_lib_lookup(net, saddr, sport, daddr, dport,
327 dif, &udp_table, NULL);
328 if (sk && !atomic_inc_not_zero(&sk->sk_refcnt))
329 sk = NULL;
330 return sk;
331 }
332 EXPORT_SYMBOL_GPL(udp6_lib_lookup);
333 #endif
334
335 /*
336 * This should be easy, if there is something there we
337 * return it, otherwise we block.
338 */
339
340 int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
341 int noblock, int flags, int *addr_len)
342 {
343 struct ipv6_pinfo *np = inet6_sk(sk);
344 struct inet_sock *inet = inet_sk(sk);
345 struct sk_buff *skb;
346 unsigned int ulen, copied;
347 int peeked, peeking, off;
348 int err;
349 int is_udplite = IS_UDPLITE(sk);
350 bool checksum_valid = false;
351 int is_udp4;
352
353 if (flags & MSG_ERRQUEUE)
354 return ipv6_recv_error(sk, msg, len, addr_len);
355
356 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
357 return ipv6_recv_rxpmtu(sk, msg, len, addr_len);
358
359 try_again:
360 peeking = off = sk_peek_offset(sk, flags);
361 skb = __skb_recv_udp(sk, flags, noblock, &peeked, &off, &err);
362 if (!skb)
363 return err;
364
365 ulen = skb->len;
366 copied = len;
367 if (copied > ulen - off)
368 copied = ulen - off;
369 else if (copied < ulen)
370 msg->msg_flags |= MSG_TRUNC;
371
372 is_udp4 = (skb->protocol == htons(ETH_P_IP));
373
374 /*
375 * If checksum is needed at all, try to do it while copying the
376 * data. If the data is truncated, or if we only want a partial
377 * coverage checksum (UDP-Lite), do it before the copy.
378 */
379
380 if (copied < ulen || peeking ||
381 (is_udplite && UDP_SKB_CB(skb)->partial_cov)) {
382 checksum_valid = !udp_lib_checksum_complete(skb);
383 if (!checksum_valid)
384 goto csum_copy_err;
385 }
386
387 if (checksum_valid || skb_csum_unnecessary(skb))
388 err = skb_copy_datagram_msg(skb, off, msg, copied);
389 else {
390 err = skb_copy_and_csum_datagram_msg(skb, off, msg);
391 if (err == -EINVAL)
392 goto csum_copy_err;
393 }
394 if (unlikely(err)) {
395 if (!peeked) {
396 atomic_inc(&sk->sk_drops);
397 if (is_udp4)
398 UDP_INC_STATS(sock_net(sk), UDP_MIB_INERRORS,
399 is_udplite);
400 else
401 UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS,
402 is_udplite);
403 }
404 kfree_skb(skb);
405 return err;
406 }
407 if (!peeked) {
408 if (is_udp4)
409 UDP_INC_STATS(sock_net(sk), UDP_MIB_INDATAGRAMS,
410 is_udplite);
411 else
412 UDP6_INC_STATS(sock_net(sk), UDP_MIB_INDATAGRAMS,
413 is_udplite);
414 }
415
416 sock_recv_ts_and_drops(msg, sk, skb);
417
418 /* Copy the address. */
419 if (msg->msg_name) {
420 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
421 sin6->sin6_family = AF_INET6;
422 sin6->sin6_port = udp_hdr(skb)->source;
423 sin6->sin6_flowinfo = 0;
424
425 if (is_udp4) {
426 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
427 &sin6->sin6_addr);
428 sin6->sin6_scope_id = 0;
429 } else {
430 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
431 sin6->sin6_scope_id =
432 ipv6_iface_scope_id(&sin6->sin6_addr,
433 inet6_iif(skb));
434 }
435 *addr_len = sizeof(*sin6);
436 }
437
438 if (np->rxopt.all)
439 ip6_datagram_recv_common_ctl(sk, msg, skb);
440
441 if (is_udp4) {
442 if (inet->cmsg_flags)
443 ip_cmsg_recv_offset(msg, sk, skb,
444 sizeof(struct udphdr), off);
445 } else {
446 if (np->rxopt.all)
447 ip6_datagram_recv_specific_ctl(sk, msg, skb);
448 }
449
450 err = copied;
451 if (flags & MSG_TRUNC)
452 err = ulen;
453
454 skb_consume_udp(sk, skb, peeking ? -err : err);
455 return err;
456
457 csum_copy_err:
458 if (!__sk_queue_drop_skb(sk, skb, flags, udp_skb_destructor)) {
459 if (is_udp4) {
460 UDP_INC_STATS(sock_net(sk),
461 UDP_MIB_CSUMERRORS, is_udplite);
462 UDP_INC_STATS(sock_net(sk),
463 UDP_MIB_INERRORS, is_udplite);
464 } else {
465 UDP6_INC_STATS(sock_net(sk),
466 UDP_MIB_CSUMERRORS, is_udplite);
467 UDP6_INC_STATS(sock_net(sk),
468 UDP_MIB_INERRORS, is_udplite);
469 }
470 }
471 kfree_skb(skb);
472
473 /* starting over for a new packet, but check if we need to yield */
474 cond_resched();
475 msg->msg_flags &= ~MSG_TRUNC;
476 goto try_again;
477 }
478
479 void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
480 u8 type, u8 code, int offset, __be32 info,
481 struct udp_table *udptable)
482 {
483 struct ipv6_pinfo *np;
484 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
485 const struct in6_addr *saddr = &hdr->saddr;
486 const struct in6_addr *daddr = &hdr->daddr;
487 struct udphdr *uh = (struct udphdr *)(skb->data+offset);
488 struct sock *sk;
489 int harderr;
490 int err;
491 struct net *net = dev_net(skb->dev);
492
493 sk = __udp6_lib_lookup(net, daddr, uh->dest, saddr, uh->source,
494 inet6_iif(skb), udptable, skb);
495 if (!sk) {
496 __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev),
497 ICMP6_MIB_INERRORS);
498 return;
499 }
500
501 harderr = icmpv6_err_convert(type, code, &err);
502 np = inet6_sk(sk);
503
504 if (type == ICMPV6_PKT_TOOBIG) {
505 if (!ip6_sk_accept_pmtu(sk))
506 goto out;
507 ip6_sk_update_pmtu(skb, sk, info);
508 if (np->pmtudisc != IPV6_PMTUDISC_DONT)
509 harderr = 1;
510 }
511 if (type == NDISC_REDIRECT) {
512 ip6_sk_redirect(skb, sk);
513 goto out;
514 }
515
516 if (!np->recverr) {
517 if (!harderr || sk->sk_state != TCP_ESTABLISHED)
518 goto out;
519 } else {
520 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
521 }
522
523 sk->sk_err = err;
524 sk->sk_error_report(sk);
525 out:
526 return;
527 }
528
529 int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
530 {
531 int rc;
532
533 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
534 sock_rps_save_rxhash(sk, skb);
535 sk_mark_napi_id(sk, skb);
536 sk_incoming_cpu_update(sk);
537 } else {
538 sk_mark_napi_id_once(sk, skb);
539 }
540
541 rc = __udp_enqueue_schedule_skb(sk, skb);
542 if (rc < 0) {
543 int is_udplite = IS_UDPLITE(sk);
544
545 /* Note that an ENOMEM error is charged twice */
546 if (rc == -ENOMEM)
547 UDP6_INC_STATS(sock_net(sk),
548 UDP_MIB_RCVBUFERRORS, is_udplite);
549 UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
550 kfree_skb(skb);
551 return -1;
552 }
553
554 return 0;
555 }
556
557 static __inline__ void udpv6_err(struct sk_buff *skb,
558 struct inet6_skb_parm *opt, u8 type,
559 u8 code, int offset, __be32 info)
560 {
561 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table);
562 }
563
564 static struct static_key udpv6_encap_needed __read_mostly;
565 void udpv6_encap_enable(void)
566 {
567 if (!static_key_enabled(&udpv6_encap_needed))
568 static_key_slow_inc(&udpv6_encap_needed);
569 }
570 EXPORT_SYMBOL(udpv6_encap_enable);
571
572 int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
573 {
574 struct udp_sock *up = udp_sk(sk);
575 int is_udplite = IS_UDPLITE(sk);
576
577 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
578 goto drop;
579
580 if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
581 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
582
583 /*
584 * This is an encapsulation socket so pass the skb to
585 * the socket's udp_encap_rcv() hook. Otherwise, just
586 * fall through and pass this up the UDP socket.
587 * up->encap_rcv() returns the following value:
588 * =0 if skb was successfully passed to the encap
589 * handler or was discarded by it.
590 * >0 if skb should be passed on to UDP.
591 * <0 if skb should be resubmitted as proto -N
592 */
593
594 /* if we're overly short, let UDP handle it */
595 encap_rcv = ACCESS_ONCE(up->encap_rcv);
596 if (encap_rcv) {
597 int ret;
598
599 /* Verify checksum before giving to encap */
600 if (udp_lib_checksum_complete(skb))
601 goto csum_error;
602
603 ret = encap_rcv(sk, skb);
604 if (ret <= 0) {
605 __UDP_INC_STATS(sock_net(sk),
606 UDP_MIB_INDATAGRAMS,
607 is_udplite);
608 return -ret;
609 }
610 }
611
612 /* FALLTHROUGH -- it's a UDP Packet */
613 }
614
615 /*
616 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
617 */
618 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
619
620 if (up->pcrlen == 0) { /* full coverage was set */
621 net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n",
622 UDP_SKB_CB(skb)->cscov, skb->len);
623 goto drop;
624 }
625 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
626 net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n",
627 UDP_SKB_CB(skb)->cscov, up->pcrlen);
628 goto drop;
629 }
630 }
631
632 if (rcu_access_pointer(sk->sk_filter) &&
633 udp_lib_checksum_complete(skb))
634 goto csum_error;
635
636 if (sk_filter_trim_cap(sk, skb, sizeof(struct udphdr)))
637 goto drop;
638
639 udp_csum_pull_header(skb);
640
641 skb_dst_drop(skb);
642
643 return __udpv6_queue_rcv_skb(sk, skb);
644
645 csum_error:
646 __UDP6_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite);
647 drop:
648 __UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
649 atomic_inc(&sk->sk_drops);
650 kfree_skb(skb);
651 return -1;
652 }
653
654 static bool __udp_v6_is_mcast_sock(struct net *net, struct sock *sk,
655 __be16 loc_port, const struct in6_addr *loc_addr,
656 __be16 rmt_port, const struct in6_addr *rmt_addr,
657 int dif, unsigned short hnum)
658 {
659 struct inet_sock *inet = inet_sk(sk);
660
661 if (!net_eq(sock_net(sk), net))
662 return false;
663
664 if (udp_sk(sk)->udp_port_hash != hnum ||
665 sk->sk_family != PF_INET6 ||
666 (inet->inet_dport && inet->inet_dport != rmt_port) ||
667 (!ipv6_addr_any(&sk->sk_v6_daddr) &&
668 !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) ||
669 (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif) ||
670 (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) &&
671 !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr)))
672 return false;
673 if (!inet6_mc_check(sk, loc_addr, rmt_addr))
674 return false;
675 return true;
676 }
677
678 static void udp6_csum_zero_error(struct sk_buff *skb)
679 {
680 /* RFC 2460 section 8.1 says that we SHOULD log
681 * this error. Well, it is reasonable.
682 */
683 net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n",
684 &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source),
685 &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest));
686 }
687
688 /*
689 * Note: called only from the BH handler context,
690 * so we don't need to lock the hashes.
691 */
692 static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
693 const struct in6_addr *saddr, const struct in6_addr *daddr,
694 struct udp_table *udptable, int proto)
695 {
696 struct sock *sk, *first = NULL;
697 const struct udphdr *uh = udp_hdr(skb);
698 unsigned short hnum = ntohs(uh->dest);
699 struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum);
700 unsigned int offset = offsetof(typeof(*sk), sk_node);
701 unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10);
702 int dif = inet6_iif(skb);
703 struct hlist_node *node;
704 struct sk_buff *nskb;
705
706 if (use_hash2) {
707 hash2_any = udp6_portaddr_hash(net, &in6addr_any, hnum) &
708 udptable->mask;
709 hash2 = udp6_portaddr_hash(net, daddr, hnum) & udptable->mask;
710 start_lookup:
711 hslot = &udptable->hash2[hash2];
712 offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node);
713 }
714
715 sk_for_each_entry_offset_rcu(sk, node, &hslot->head, offset) {
716 if (!__udp_v6_is_mcast_sock(net, sk, uh->dest, daddr,
717 uh->source, saddr, dif, hnum))
718 continue;
719 /* If zero checksum and no_check is not on for
720 * the socket then skip it.
721 */
722 if (!uh->check && !udp_sk(sk)->no_check6_rx)
723 continue;
724 if (!first) {
725 first = sk;
726 continue;
727 }
728 nskb = skb_clone(skb, GFP_ATOMIC);
729 if (unlikely(!nskb)) {
730 atomic_inc(&sk->sk_drops);
731 __UDP6_INC_STATS(net, UDP_MIB_RCVBUFERRORS,
732 IS_UDPLITE(sk));
733 __UDP6_INC_STATS(net, UDP_MIB_INERRORS,
734 IS_UDPLITE(sk));
735 continue;
736 }
737
738 if (udpv6_queue_rcv_skb(sk, nskb) > 0)
739 consume_skb(nskb);
740 }
741
742 /* Also lookup *:port if we are using hash2 and haven't done so yet. */
743 if (use_hash2 && hash2 != hash2_any) {
744 hash2 = hash2_any;
745 goto start_lookup;
746 }
747
748 if (first) {
749 if (udpv6_queue_rcv_skb(first, skb) > 0)
750 consume_skb(skb);
751 } else {
752 kfree_skb(skb);
753 __UDP6_INC_STATS(net, UDP_MIB_IGNOREDMULTI,
754 proto == IPPROTO_UDPLITE);
755 }
756 return 0;
757 }
758
759 int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
760 int proto)
761 {
762 const struct in6_addr *saddr, *daddr;
763 struct net *net = dev_net(skb->dev);
764 struct udphdr *uh;
765 struct sock *sk;
766 u32 ulen = 0;
767
768 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
769 goto discard;
770
771 saddr = &ipv6_hdr(skb)->saddr;
772 daddr = &ipv6_hdr(skb)->daddr;
773 uh = udp_hdr(skb);
774
775 ulen = ntohs(uh->len);
776 if (ulen > skb->len)
777 goto short_packet;
778
779 if (proto == IPPROTO_UDP) {
780 /* UDP validates ulen. */
781
782 /* Check for jumbo payload */
783 if (ulen == 0)
784 ulen = skb->len;
785
786 if (ulen < sizeof(*uh))
787 goto short_packet;
788
789 if (ulen < skb->len) {
790 if (pskb_trim_rcsum(skb, ulen))
791 goto short_packet;
792 saddr = &ipv6_hdr(skb)->saddr;
793 daddr = &ipv6_hdr(skb)->daddr;
794 uh = udp_hdr(skb);
795 }
796 }
797
798 if (udp6_csum_init(skb, uh, proto))
799 goto csum_error;
800
801 /*
802 * Multicast receive code
803 */
804 if (ipv6_addr_is_multicast(daddr))
805 return __udp6_lib_mcast_deliver(net, skb,
806 saddr, daddr, udptable, proto);
807
808 /* Unicast */
809
810 /*
811 * check socket cache ... must talk to Alan about his plans
812 * for sock caches... i'll skip this for now.
813 */
814 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
815 if (sk) {
816 int ret;
817
818 if (!uh->check && !udp_sk(sk)->no_check6_rx) {
819 udp6_csum_zero_error(skb);
820 goto csum_error;
821 }
822
823 if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk))
824 skb_checksum_try_convert(skb, IPPROTO_UDP, uh->check,
825 ip6_compute_pseudo);
826
827 ret = udpv6_queue_rcv_skb(sk, skb);
828
829 /* a return value > 0 means to resubmit the input */
830 if (ret > 0)
831 return ret;
832
833 return 0;
834 }
835
836 if (!uh->check) {
837 udp6_csum_zero_error(skb);
838 goto csum_error;
839 }
840
841 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
842 goto discard;
843
844 if (udp_lib_checksum_complete(skb))
845 goto csum_error;
846
847 __UDP6_INC_STATS(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
848 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
849
850 kfree_skb(skb);
851 return 0;
852
853 short_packet:
854 net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n",
855 proto == IPPROTO_UDPLITE ? "-Lite" : "",
856 saddr, ntohs(uh->source),
857 ulen, skb->len,
858 daddr, ntohs(uh->dest));
859 goto discard;
860 csum_error:
861 __UDP6_INC_STATS(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE);
862 discard:
863 __UDP6_INC_STATS(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
864 kfree_skb(skb);
865 return 0;
866 }
867
868
869 static struct sock *__udp6_lib_demux_lookup(struct net *net,
870 __be16 loc_port, const struct in6_addr *loc_addr,
871 __be16 rmt_port, const struct in6_addr *rmt_addr,
872 int dif)
873 {
874 unsigned short hnum = ntohs(loc_port);
875 unsigned int hash2 = udp6_portaddr_hash(net, loc_addr, hnum);
876 unsigned int slot2 = hash2 & udp_table.mask;
877 struct udp_hslot *hslot2 = &udp_table.hash2[slot2];
878 const __portpair ports = INET_COMBINED_PORTS(rmt_port, hnum);
879 struct sock *sk;
880
881 udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) {
882 if (INET6_MATCH(sk, net, rmt_addr, loc_addr, ports, dif))
883 return sk;
884 /* Only check first socket in chain */
885 break;
886 }
887 return NULL;
888 }
889
890 static void udp_v6_early_demux(struct sk_buff *skb)
891 {
892 struct net *net = dev_net(skb->dev);
893 const struct udphdr *uh;
894 struct sock *sk;
895 struct dst_entry *dst;
896 int dif = skb->dev->ifindex;
897
898 if (!pskb_may_pull(skb, skb_transport_offset(skb) +
899 sizeof(struct udphdr)))
900 return;
901
902 uh = udp_hdr(skb);
903
904 if (skb->pkt_type == PACKET_HOST)
905 sk = __udp6_lib_demux_lookup(net, uh->dest,
906 &ipv6_hdr(skb)->daddr,
907 uh->source, &ipv6_hdr(skb)->saddr,
908 dif);
909 else
910 return;
911
912 if (!sk || !atomic_inc_not_zero_hint(&sk->sk_refcnt, 2))
913 return;
914
915 skb->sk = sk;
916 skb->destructor = sock_efree;
917 dst = READ_ONCE(sk->sk_rx_dst);
918
919 if (dst)
920 dst = dst_check(dst, inet6_sk(sk)->rx_dst_cookie);
921 if (dst) {
922 if (dst->flags & DST_NOCACHE) {
923 if (likely(atomic_inc_not_zero(&dst->__refcnt)))
924 skb_dst_set(skb, dst);
925 } else {
926 skb_dst_set_noref(skb, dst);
927 }
928 }
929 }
930
931 static __inline__ int udpv6_rcv(struct sk_buff *skb)
932 {
933 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP);
934 }
935
936 /*
937 * Throw away all pending data and cancel the corking. Socket is locked.
938 */
939 static void udp_v6_flush_pending_frames(struct sock *sk)
940 {
941 struct udp_sock *up = udp_sk(sk);
942
943 if (up->pending == AF_INET)
944 udp_flush_pending_frames(sk);
945 else if (up->pending) {
946 up->len = 0;
947 up->pending = 0;
948 ip6_flush_pending_frames(sk);
949 }
950 }
951
952 /**
953 * udp6_hwcsum_outgoing - handle outgoing HW checksumming
954 * @sk: socket we are sending on
955 * @skb: sk_buff containing the filled-in UDP header
956 * (checksum field must be zeroed out)
957 */
958 static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
959 const struct in6_addr *saddr,
960 const struct in6_addr *daddr, int len)
961 {
962 unsigned int offset;
963 struct udphdr *uh = udp_hdr(skb);
964 struct sk_buff *frags = skb_shinfo(skb)->frag_list;
965 __wsum csum = 0;
966
967 if (!frags) {
968 /* Only one fragment on the socket. */
969 skb->csum_start = skb_transport_header(skb) - skb->head;
970 skb->csum_offset = offsetof(struct udphdr, check);
971 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0);
972 } else {
973 /*
974 * HW-checksum won't work as there are two or more
975 * fragments on the socket so that all csums of sk_buffs
976 * should be together
977 */
978 offset = skb_transport_offset(skb);
979 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
980
981 skb->ip_summed = CHECKSUM_NONE;
982
983 do {
984 csum = csum_add(csum, frags->csum);
985 } while ((frags = frags->next));
986
987 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP,
988 csum);
989 if (uh->check == 0)
990 uh->check = CSUM_MANGLED_0;
991 }
992 }
993
994 /*
995 * Sending
996 */
997
998 static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6)
999 {
1000 struct sock *sk = skb->sk;
1001 struct udphdr *uh;
1002 int err = 0;
1003 int is_udplite = IS_UDPLITE(sk);
1004 __wsum csum = 0;
1005 int offset = skb_transport_offset(skb);
1006 int len = skb->len - offset;
1007
1008 /*
1009 * Create a UDP header
1010 */
1011 uh = udp_hdr(skb);
1012 uh->source = fl6->fl6_sport;
1013 uh->dest = fl6->fl6_dport;
1014 uh->len = htons(len);
1015 uh->check = 0;
1016
1017 if (is_udplite)
1018 csum = udplite_csum(skb);
1019 else if (udp_sk(sk)->no_check6_tx) { /* UDP csum disabled */
1020 skb->ip_summed = CHECKSUM_NONE;
1021 goto send;
1022 } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
1023 udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, len);
1024 goto send;
1025 } else
1026 csum = udp_csum(skb);
1027
1028 /* add protocol-dependent pseudo-header */
1029 uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
1030 len, fl6->flowi6_proto, csum);
1031 if (uh->check == 0)
1032 uh->check = CSUM_MANGLED_0;
1033
1034 send:
1035 err = ip6_send_skb(skb);
1036 if (err) {
1037 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) {
1038 UDP6_INC_STATS(sock_net(sk),
1039 UDP_MIB_SNDBUFERRORS, is_udplite);
1040 err = 0;
1041 }
1042 } else {
1043 UDP6_INC_STATS(sock_net(sk),
1044 UDP_MIB_OUTDATAGRAMS, is_udplite);
1045 }
1046 return err;
1047 }
1048
1049 static int udp_v6_push_pending_frames(struct sock *sk)
1050 {
1051 struct sk_buff *skb;
1052 struct udp_sock *up = udp_sk(sk);
1053 struct flowi6 fl6;
1054 int err = 0;
1055
1056 if (up->pending == AF_INET)
1057 return udp_push_pending_frames(sk);
1058
1059 /* ip6_finish_skb will release the cork, so make a copy of
1060 * fl6 here.
1061 */
1062 fl6 = inet_sk(sk)->cork.fl.u.ip6;
1063
1064 skb = ip6_finish_skb(sk);
1065 if (!skb)
1066 goto out;
1067
1068 err = udp_v6_send_skb(skb, &fl6);
1069
1070 out:
1071 up->len = 0;
1072 up->pending = 0;
1073 return err;
1074 }
1075
1076 int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
1077 {
1078 struct ipv6_txoptions opt_space;
1079 struct udp_sock *up = udp_sk(sk);
1080 struct inet_sock *inet = inet_sk(sk);
1081 struct ipv6_pinfo *np = inet6_sk(sk);
1082 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
1083 struct in6_addr *daddr, *final_p, final;
1084 struct ipv6_txoptions *opt = NULL;
1085 struct ipv6_txoptions *opt_to_free = NULL;
1086 struct ip6_flowlabel *flowlabel = NULL;
1087 struct flowi6 fl6;
1088 struct dst_entry *dst;
1089 struct ipcm6_cookie ipc6;
1090 int addr_len = msg->msg_namelen;
1091 int ulen = len;
1092 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
1093 int err;
1094 int connected = 0;
1095 int is_udplite = IS_UDPLITE(sk);
1096 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
1097 struct sockcm_cookie sockc;
1098
1099 ipc6.hlimit = -1;
1100 ipc6.tclass = -1;
1101 ipc6.dontfrag = -1;
1102 sockc.tsflags = sk->sk_tsflags;
1103
1104 /* destination address check */
1105 if (sin6) {
1106 if (addr_len < offsetof(struct sockaddr, sa_data))
1107 return -EINVAL;
1108
1109 switch (sin6->sin6_family) {
1110 case AF_INET6:
1111 if (addr_len < SIN6_LEN_RFC2133)
1112 return -EINVAL;
1113 daddr = &sin6->sin6_addr;
1114 if (ipv6_addr_any(daddr) &&
1115 ipv6_addr_v4mapped(&np->saddr))
1116 ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK),
1117 daddr);
1118 break;
1119 case AF_INET:
1120 goto do_udp_sendmsg;
1121 case AF_UNSPEC:
1122 msg->msg_name = sin6 = NULL;
1123 msg->msg_namelen = addr_len = 0;
1124 daddr = NULL;
1125 break;
1126 default:
1127 return -EINVAL;
1128 }
1129 } else if (!up->pending) {
1130 if (sk->sk_state != TCP_ESTABLISHED)
1131 return -EDESTADDRREQ;
1132 daddr = &sk->sk_v6_daddr;
1133 } else
1134 daddr = NULL;
1135
1136 if (daddr) {
1137 if (ipv6_addr_v4mapped(daddr)) {
1138 struct sockaddr_in sin;
1139 sin.sin_family = AF_INET;
1140 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport;
1141 sin.sin_addr.s_addr = daddr->s6_addr32[3];
1142 msg->msg_name = &sin;
1143 msg->msg_namelen = sizeof(sin);
1144 do_udp_sendmsg:
1145 if (__ipv6_only_sock(sk))
1146 return -ENETUNREACH;
1147 return udp_sendmsg(sk, msg, len);
1148 }
1149 }
1150
1151 if (up->pending == AF_INET)
1152 return udp_sendmsg(sk, msg, len);
1153
1154 /* Rough check on arithmetic overflow,
1155 better check is made in ip6_append_data().
1156 */
1157 if (len > INT_MAX - sizeof(struct udphdr))
1158 return -EMSGSIZE;
1159
1160 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
1161 if (up->pending) {
1162 /*
1163 * There are pending frames.
1164 * The socket lock must be held while it's corked.
1165 */
1166 lock_sock(sk);
1167 if (likely(up->pending)) {
1168 if (unlikely(up->pending != AF_INET6)) {
1169 release_sock(sk);
1170 return -EAFNOSUPPORT;
1171 }
1172 dst = NULL;
1173 goto do_append_data;
1174 }
1175 release_sock(sk);
1176 }
1177 ulen += sizeof(struct udphdr);
1178
1179 memset(&fl6, 0, sizeof(fl6));
1180
1181 if (sin6) {
1182 if (sin6->sin6_port == 0)
1183 return -EINVAL;
1184
1185 fl6.fl6_dport = sin6->sin6_port;
1186 daddr = &sin6->sin6_addr;
1187
1188 if (np->sndflow) {
1189 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
1190 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
1191 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1192 if (!flowlabel)
1193 return -EINVAL;
1194 }
1195 }
1196
1197 /*
1198 * Otherwise it will be difficult to maintain
1199 * sk->sk_dst_cache.
1200 */
1201 if (sk->sk_state == TCP_ESTABLISHED &&
1202 ipv6_addr_equal(daddr, &sk->sk_v6_daddr))
1203 daddr = &sk->sk_v6_daddr;
1204
1205 if (addr_len >= sizeof(struct sockaddr_in6) &&
1206 sin6->sin6_scope_id &&
1207 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
1208 fl6.flowi6_oif = sin6->sin6_scope_id;
1209 } else {
1210 if (sk->sk_state != TCP_ESTABLISHED)
1211 return -EDESTADDRREQ;
1212
1213 fl6.fl6_dport = inet->inet_dport;
1214 daddr = &sk->sk_v6_daddr;
1215 fl6.flowlabel = np->flow_label;
1216 connected = 1;
1217 }
1218
1219 if (!fl6.flowi6_oif)
1220 fl6.flowi6_oif = sk->sk_bound_dev_if;
1221
1222 if (!fl6.flowi6_oif)
1223 fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex;
1224
1225 fl6.flowi6_mark = sk->sk_mark;
1226 fl6.flowi6_uid = sk->sk_uid;
1227
1228 if (msg->msg_controllen) {
1229 opt = &opt_space;
1230 memset(opt, 0, sizeof(struct ipv6_txoptions));
1231 opt->tot_len = sizeof(*opt);
1232 ipc6.opt = opt;
1233
1234 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, &ipc6, &sockc);
1235 if (err < 0) {
1236 fl6_sock_release(flowlabel);
1237 return err;
1238 }
1239 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
1240 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1241 if (!flowlabel)
1242 return -EINVAL;
1243 }
1244 if (!(opt->opt_nflen|opt->opt_flen))
1245 opt = NULL;
1246 connected = 0;
1247 }
1248 if (!opt) {
1249 opt = txopt_get(np);
1250 opt_to_free = opt;
1251 }
1252 if (flowlabel)
1253 opt = fl6_merge_options(&opt_space, flowlabel, opt);
1254 opt = ipv6_fixup_options(&opt_space, opt);
1255 ipc6.opt = opt;
1256
1257 fl6.flowi6_proto = sk->sk_protocol;
1258 if (!ipv6_addr_any(daddr))
1259 fl6.daddr = *daddr;
1260 else
1261 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
1262 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
1263 fl6.saddr = np->saddr;
1264 fl6.fl6_sport = inet->inet_sport;
1265
1266 final_p = fl6_update_dst(&fl6, opt, &final);
1267 if (final_p)
1268 connected = 0;
1269
1270 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) {
1271 fl6.flowi6_oif = np->mcast_oif;
1272 connected = 0;
1273 } else if (!fl6.flowi6_oif)
1274 fl6.flowi6_oif = np->ucast_oif;
1275
1276 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
1277
1278 if (ipc6.tclass < 0)
1279 ipc6.tclass = np->tclass;
1280
1281 fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel);
1282
1283 dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p);
1284 if (IS_ERR(dst)) {
1285 err = PTR_ERR(dst);
1286 dst = NULL;
1287 goto out;
1288 }
1289
1290 if (ipc6.hlimit < 0)
1291 ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
1292
1293 if (msg->msg_flags&MSG_CONFIRM)
1294 goto do_confirm;
1295 back_from_confirm:
1296
1297 /* Lockless fast path for the non-corking case */
1298 if (!corkreq) {
1299 struct sk_buff *skb;
1300
1301 skb = ip6_make_skb(sk, getfrag, msg, ulen,
1302 sizeof(struct udphdr), &ipc6,
1303 &fl6, (struct rt6_info *)dst,
1304 msg->msg_flags, &sockc);
1305 err = PTR_ERR(skb);
1306 if (!IS_ERR_OR_NULL(skb))
1307 err = udp_v6_send_skb(skb, &fl6);
1308 goto release_dst;
1309 }
1310
1311 lock_sock(sk);
1312 if (unlikely(up->pending)) {
1313 /* The socket is already corked while preparing it. */
1314 /* ... which is an evident application bug. --ANK */
1315 release_sock(sk);
1316
1317 net_dbg_ratelimited("udp cork app bug 2\n");
1318 err = -EINVAL;
1319 goto out;
1320 }
1321
1322 up->pending = AF_INET6;
1323
1324 do_append_data:
1325 if (ipc6.dontfrag < 0)
1326 ipc6.dontfrag = np->dontfrag;
1327 up->len += ulen;
1328 err = ip6_append_data(sk, getfrag, msg, ulen, sizeof(struct udphdr),
1329 &ipc6, &fl6, (struct rt6_info *)dst,
1330 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, &sockc);
1331 if (err)
1332 udp_v6_flush_pending_frames(sk);
1333 else if (!corkreq)
1334 err = udp_v6_push_pending_frames(sk);
1335 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
1336 up->pending = 0;
1337
1338 if (err > 0)
1339 err = np->recverr ? net_xmit_errno(err) : 0;
1340 release_sock(sk);
1341
1342 release_dst:
1343 if (dst) {
1344 if (connected) {
1345 ip6_dst_store(sk, dst,
1346 ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ?
1347 &sk->sk_v6_daddr : NULL,
1348 #ifdef CONFIG_IPV6_SUBTREES
1349 ipv6_addr_equal(&fl6.saddr, &np->saddr) ?
1350 &np->saddr :
1351 #endif
1352 NULL);
1353 } else {
1354 dst_release(dst);
1355 }
1356 dst = NULL;
1357 }
1358
1359 out:
1360 dst_release(dst);
1361 fl6_sock_release(flowlabel);
1362 txopt_put(opt_to_free);
1363 if (!err)
1364 return len;
1365 /*
1366 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
1367 * ENOBUFS might not be good (it's not tunable per se), but otherwise
1368 * we don't have a good statistic (IpOutDiscards but it can be too many
1369 * things). We could add another new stat but at least for now that
1370 * seems like overkill.
1371 */
1372 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
1373 UDP6_INC_STATS(sock_net(sk),
1374 UDP_MIB_SNDBUFERRORS, is_udplite);
1375 }
1376 return err;
1377
1378 do_confirm:
1379 if (msg->msg_flags & MSG_PROBE)
1380 dst_confirm_neigh(dst, &fl6.daddr);
1381 if (!(msg->msg_flags&MSG_PROBE) || len)
1382 goto back_from_confirm;
1383 err = 0;
1384 goto out;
1385 }
1386
1387 void udpv6_destroy_sock(struct sock *sk)
1388 {
1389 struct udp_sock *up = udp_sk(sk);
1390 lock_sock(sk);
1391 udp_v6_flush_pending_frames(sk);
1392 release_sock(sk);
1393
1394 if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
1395 void (*encap_destroy)(struct sock *sk);
1396 encap_destroy = ACCESS_ONCE(up->encap_destroy);
1397 if (encap_destroy)
1398 encap_destroy(sk);
1399 }
1400
1401 inet6_destroy_sock(sk);
1402 }
1403
1404 /*
1405 * Socket option code for UDP
1406 */
1407 int udpv6_setsockopt(struct sock *sk, int level, int optname,
1408 char __user *optval, unsigned int optlen)
1409 {
1410 if (level == SOL_UDP || level == SOL_UDPLITE)
1411 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1412 udp_v6_push_pending_frames);
1413 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1414 }
1415
1416 #ifdef CONFIG_COMPAT
1417 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
1418 char __user *optval, unsigned int optlen)
1419 {
1420 if (level == SOL_UDP || level == SOL_UDPLITE)
1421 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1422 udp_v6_push_pending_frames);
1423 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
1424 }
1425 #endif
1426
1427 int udpv6_getsockopt(struct sock *sk, int level, int optname,
1428 char __user *optval, int __user *optlen)
1429 {
1430 if (level == SOL_UDP || level == SOL_UDPLITE)
1431 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1432 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1433 }
1434
1435 #ifdef CONFIG_COMPAT
1436 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
1437 char __user *optval, int __user *optlen)
1438 {
1439 if (level == SOL_UDP || level == SOL_UDPLITE)
1440 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1441 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
1442 }
1443 #endif
1444
1445 static struct inet6_protocol udpv6_protocol = {
1446 .early_demux = udp_v6_early_demux,
1447 .early_demux_handler = udp_v6_early_demux,
1448 .handler = udpv6_rcv,
1449 .err_handler = udpv6_err,
1450 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1451 };
1452
1453 /* ------------------------------------------------------------------------ */
1454 #ifdef CONFIG_PROC_FS
1455 int udp6_seq_show(struct seq_file *seq, void *v)
1456 {
1457 if (v == SEQ_START_TOKEN) {
1458 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
1459 } else {
1460 int bucket = ((struct udp_iter_state *)seq->private)->bucket;
1461 struct inet_sock *inet = inet_sk(v);
1462 __u16 srcp = ntohs(inet->inet_sport);
1463 __u16 destp = ntohs(inet->inet_dport);
1464 ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket);
1465 }
1466 return 0;
1467 }
1468
1469 static const struct file_operations udp6_afinfo_seq_fops = {
1470 .owner = THIS_MODULE,
1471 .open = udp_seq_open,
1472 .read = seq_read,
1473 .llseek = seq_lseek,
1474 .release = seq_release_net
1475 };
1476
1477 static struct udp_seq_afinfo udp6_seq_afinfo = {
1478 .name = "udp6",
1479 .family = AF_INET6,
1480 .udp_table = &udp_table,
1481 .seq_fops = &udp6_afinfo_seq_fops,
1482 .seq_ops = {
1483 .show = udp6_seq_show,
1484 },
1485 };
1486
1487 int __net_init udp6_proc_init(struct net *net)
1488 {
1489 return udp_proc_register(net, &udp6_seq_afinfo);
1490 }
1491
1492 void udp6_proc_exit(struct net *net)
1493 {
1494 udp_proc_unregister(net, &udp6_seq_afinfo);
1495 }
1496 #endif /* CONFIG_PROC_FS */
1497
1498 /* ------------------------------------------------------------------------ */
1499
1500 struct proto udpv6_prot = {
1501 .name = "UDPv6",
1502 .owner = THIS_MODULE,
1503 .close = udp_lib_close,
1504 .connect = ip6_datagram_connect,
1505 .disconnect = udp_disconnect,
1506 .ioctl = udp_ioctl,
1507 .init = udp_init_sock,
1508 .destroy = udpv6_destroy_sock,
1509 .setsockopt = udpv6_setsockopt,
1510 .getsockopt = udpv6_getsockopt,
1511 .sendmsg = udpv6_sendmsg,
1512 .recvmsg = udpv6_recvmsg,
1513 .release_cb = ip6_datagram_release_cb,
1514 .hash = udp_lib_hash,
1515 .unhash = udp_lib_unhash,
1516 .rehash = udp_v6_rehash,
1517 .get_port = udp_v6_get_port,
1518 .memory_allocated = &udp_memory_allocated,
1519 .sysctl_mem = sysctl_udp_mem,
1520 .sysctl_wmem = &sysctl_udp_wmem_min,
1521 .sysctl_rmem = &sysctl_udp_rmem_min,
1522 .obj_size = sizeof(struct udp6_sock),
1523 .h.udp_table = &udp_table,
1524 #ifdef CONFIG_COMPAT
1525 .compat_setsockopt = compat_udpv6_setsockopt,
1526 .compat_getsockopt = compat_udpv6_getsockopt,
1527 #endif
1528 .diag_destroy = udp_abort,
1529 };
1530
1531 static struct inet_protosw udpv6_protosw = {
1532 .type = SOCK_DGRAM,
1533 .protocol = IPPROTO_UDP,
1534 .prot = &udpv6_prot,
1535 .ops = &inet6_dgram_ops,
1536 .flags = INET_PROTOSW_PERMANENT,
1537 };
1538
1539 int __init udpv6_init(void)
1540 {
1541 int ret;
1542
1543 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
1544 if (ret)
1545 goto out;
1546
1547 ret = inet6_register_protosw(&udpv6_protosw);
1548 if (ret)
1549 goto out_udpv6_protocol;
1550 out:
1551 return ret;
1552
1553 out_udpv6_protocol:
1554 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1555 goto out;
1556 }
1557
1558 void udpv6_exit(void)
1559 {
1560 inet6_unregister_protosw(&udpv6_protosw);
1561 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1562 }
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