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net: rename ICMP6_INC_STATS_BH()
[deliverable/linux.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 inline int compute_score(struct sock *sk, struct net *net,
119 unsigned short hnum,
120 const struct in6_addr *saddr, __be16 sport,
121 const struct in6_addr *daddr, __be16 dport,
122 int dif)
123 {
124 int score;
125 struct inet_sock *inet;
126
127 if (!net_eq(sock_net(sk), net) ||
128 udp_sk(sk)->udp_port_hash != hnum ||
129 sk->sk_family != PF_INET6)
130 return -1;
131
132 score = 0;
133 inet = inet_sk(sk);
134
135 if (inet->inet_dport) {
136 if (inet->inet_dport != sport)
137 return -1;
138 score++;
139 }
140
141 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
142 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr))
143 return -1;
144 score++;
145 }
146
147 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
148 if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr))
149 return -1;
150 score++;
151 }
152
153 if (sk->sk_bound_dev_if) {
154 if (sk->sk_bound_dev_if != dif)
155 return -1;
156 score++;
157 }
158
159 if (sk->sk_incoming_cpu == raw_smp_processor_id())
160 score++;
161
162 return score;
163 }
164
165 static inline int compute_score2(struct sock *sk, struct net *net,
166 const struct in6_addr *saddr, __be16 sport,
167 const struct in6_addr *daddr,
168 unsigned short hnum, int dif)
169 {
170 int score;
171 struct inet_sock *inet;
172
173 if (!net_eq(sock_net(sk), net) ||
174 udp_sk(sk)->udp_port_hash != hnum ||
175 sk->sk_family != PF_INET6)
176 return -1;
177
178 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr))
179 return -1;
180
181 score = 0;
182 inet = inet_sk(sk);
183
184 if (inet->inet_dport) {
185 if (inet->inet_dport != sport)
186 return -1;
187 score++;
188 }
189
190 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
191 if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr))
192 return -1;
193 score++;
194 }
195
196 if (sk->sk_bound_dev_if) {
197 if (sk->sk_bound_dev_if != dif)
198 return -1;
199 score++;
200 }
201
202 if (sk->sk_incoming_cpu == raw_smp_processor_id())
203 score++;
204
205 return score;
206 }
207
208 /* called with read_rcu_lock() */
209 static struct sock *udp6_lib_lookup2(struct net *net,
210 const struct in6_addr *saddr, __be16 sport,
211 const struct in6_addr *daddr, unsigned int hnum, int dif,
212 struct udp_hslot *hslot2, unsigned int slot2,
213 struct sk_buff *skb)
214 {
215 struct sock *sk, *result;
216 int score, badness, matches = 0, reuseport = 0;
217 u32 hash = 0;
218
219 result = NULL;
220 badness = -1;
221 udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) {
222 score = compute_score2(sk, net, saddr, sport,
223 daddr, hnum, dif);
224 if (score > badness) {
225 reuseport = sk->sk_reuseport;
226 if (reuseport) {
227 hash = udp6_ehashfn(net, daddr, hnum,
228 saddr, sport);
229
230 result = reuseport_select_sock(sk, hash, skb,
231 sizeof(struct udphdr));
232 if (result)
233 return result;
234 matches = 1;
235 }
236 result = sk;
237 badness = score;
238 } else if (score == badness && reuseport) {
239 matches++;
240 if (reciprocal_scale(hash, matches) == 0)
241 result = sk;
242 hash = next_pseudo_random32(hash);
243 }
244 }
245 return result;
246 }
247
248 /* rcu_read_lock() must be held */
249 struct sock *__udp6_lib_lookup(struct net *net,
250 const struct in6_addr *saddr, __be16 sport,
251 const struct in6_addr *daddr, __be16 dport,
252 int dif, struct udp_table *udptable,
253 struct sk_buff *skb)
254 {
255 struct sock *sk, *result;
256 unsigned short hnum = ntohs(dport);
257 unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask);
258 struct udp_hslot *hslot2, *hslot = &udptable->hash[slot];
259 int score, badness, matches = 0, reuseport = 0;
260 u32 hash = 0;
261
262 if (hslot->count > 10) {
263 hash2 = udp6_portaddr_hash(net, daddr, hnum);
264 slot2 = hash2 & udptable->mask;
265 hslot2 = &udptable->hash2[slot2];
266 if (hslot->count < hslot2->count)
267 goto begin;
268
269 result = udp6_lib_lookup2(net, saddr, sport,
270 daddr, hnum, dif,
271 hslot2, slot2, skb);
272 if (!result) {
273 hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum);
274 slot2 = hash2 & udptable->mask;
275 hslot2 = &udptable->hash2[slot2];
276 if (hslot->count < hslot2->count)
277 goto begin;
278
279 result = udp6_lib_lookup2(net, saddr, sport,
280 &in6addr_any, hnum, dif,
281 hslot2, slot2, skb);
282 }
283 return result;
284 }
285 begin:
286 result = NULL;
287 badness = -1;
288 sk_for_each_rcu(sk, &hslot->head) {
289 score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif);
290 if (score > badness) {
291 reuseport = sk->sk_reuseport;
292 if (reuseport) {
293 hash = udp6_ehashfn(net, daddr, hnum,
294 saddr, sport);
295 result = reuseport_select_sock(sk, hash, skb,
296 sizeof(struct udphdr));
297 if (result)
298 return result;
299 matches = 1;
300 }
301 result = sk;
302 badness = score;
303 } else if (score == badness && reuseport) {
304 matches++;
305 if (reciprocal_scale(hash, matches) == 0)
306 result = sk;
307 hash = next_pseudo_random32(hash);
308 }
309 }
310 return result;
311 }
312 EXPORT_SYMBOL_GPL(__udp6_lib_lookup);
313
314 static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb,
315 __be16 sport, __be16 dport,
316 struct udp_table *udptable)
317 {
318 struct sock *sk;
319 const struct ipv6hdr *iph = ipv6_hdr(skb);
320
321 sk = skb_steal_sock(skb);
322 if (unlikely(sk))
323 return sk;
324 return __udp6_lib_lookup(dev_net(skb_dst(skb)->dev), &iph->saddr, sport,
325 &iph->daddr, dport, inet6_iif(skb),
326 udptable, skb);
327 }
328
329 struct sock *udp6_lib_lookup_skb(struct sk_buff *skb,
330 __be16 sport, __be16 dport)
331 {
332 const struct ipv6hdr *iph = ipv6_hdr(skb);
333 const struct net_device *dev =
334 skb_dst(skb) ? skb_dst(skb)->dev : skb->dev;
335
336 return __udp6_lib_lookup(dev_net(dev), &iph->saddr, sport,
337 &iph->daddr, dport, inet6_iif(skb),
338 &udp_table, skb);
339 }
340 EXPORT_SYMBOL_GPL(udp6_lib_lookup_skb);
341
342 /* Must be called under rcu_read_lock().
343 * Does increment socket refcount.
344 */
345 #if IS_ENABLED(CONFIG_NETFILTER_XT_MATCH_SOCKET) || \
346 IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TPROXY)
347 struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport,
348 const struct in6_addr *daddr, __be16 dport, int dif)
349 {
350 struct sock *sk;
351
352 sk = __udp6_lib_lookup(net, saddr, sport, daddr, dport,
353 dif, &udp_table, NULL);
354 if (sk && !atomic_inc_not_zero(&sk->sk_refcnt))
355 sk = NULL;
356 return sk;
357 }
358 EXPORT_SYMBOL_GPL(udp6_lib_lookup);
359 #endif
360
361 /*
362 * This should be easy, if there is something there we
363 * return it, otherwise we block.
364 */
365
366 int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
367 int noblock, int flags, int *addr_len)
368 {
369 struct ipv6_pinfo *np = inet6_sk(sk);
370 struct inet_sock *inet = inet_sk(sk);
371 struct sk_buff *skb;
372 unsigned int ulen, copied;
373 int peeked, peeking, off;
374 int err;
375 int is_udplite = IS_UDPLITE(sk);
376 bool checksum_valid = false;
377 int is_udp4;
378 bool slow;
379
380 if (flags & MSG_ERRQUEUE)
381 return ipv6_recv_error(sk, msg, len, addr_len);
382
383 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
384 return ipv6_recv_rxpmtu(sk, msg, len, addr_len);
385
386 try_again:
387 peeking = off = sk_peek_offset(sk, flags);
388 skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),
389 &peeked, &off, &err);
390 if (!skb)
391 return err;
392
393 ulen = skb->len;
394 copied = len;
395 if (copied > ulen - off)
396 copied = ulen - off;
397 else if (copied < ulen)
398 msg->msg_flags |= MSG_TRUNC;
399
400 is_udp4 = (skb->protocol == htons(ETH_P_IP));
401
402 /*
403 * If checksum is needed at all, try to do it while copying the
404 * data. If the data is truncated, or if we only want a partial
405 * coverage checksum (UDP-Lite), do it before the copy.
406 */
407
408 if (copied < ulen || UDP_SKB_CB(skb)->partial_cov || peeking) {
409 checksum_valid = !udp_lib_checksum_complete(skb);
410 if (!checksum_valid)
411 goto csum_copy_err;
412 }
413
414 if (checksum_valid || skb_csum_unnecessary(skb))
415 err = skb_copy_datagram_msg(skb, off, msg, copied);
416 else {
417 err = skb_copy_and_csum_datagram_msg(skb, off, msg);
418 if (err == -EINVAL)
419 goto csum_copy_err;
420 }
421 if (unlikely(err)) {
422 trace_kfree_skb(skb, udpv6_recvmsg);
423 if (!peeked) {
424 atomic_inc(&sk->sk_drops);
425 if (is_udp4)
426 UDP_INC_STATS(sock_net(sk), UDP_MIB_INERRORS,
427 is_udplite);
428 else
429 UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS,
430 is_udplite);
431 }
432 skb_free_datagram_locked(sk, skb);
433 return err;
434 }
435 if (!peeked) {
436 if (is_udp4)
437 UDP_INC_STATS(sock_net(sk), UDP_MIB_INDATAGRAMS,
438 is_udplite);
439 else
440 UDP6_INC_STATS(sock_net(sk), UDP_MIB_INDATAGRAMS,
441 is_udplite);
442 }
443
444 sock_recv_ts_and_drops(msg, sk, skb);
445
446 /* Copy the address. */
447 if (msg->msg_name) {
448 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
449 sin6->sin6_family = AF_INET6;
450 sin6->sin6_port = udp_hdr(skb)->source;
451 sin6->sin6_flowinfo = 0;
452
453 if (is_udp4) {
454 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
455 &sin6->sin6_addr);
456 sin6->sin6_scope_id = 0;
457 } else {
458 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
459 sin6->sin6_scope_id =
460 ipv6_iface_scope_id(&sin6->sin6_addr,
461 inet6_iif(skb));
462 }
463 *addr_len = sizeof(*sin6);
464 }
465
466 if (np->rxopt.all)
467 ip6_datagram_recv_common_ctl(sk, msg, skb);
468
469 if (is_udp4) {
470 if (inet->cmsg_flags)
471 ip_cmsg_recv(msg, skb);
472 } else {
473 if (np->rxopt.all)
474 ip6_datagram_recv_specific_ctl(sk, msg, skb);
475 }
476
477 err = copied;
478 if (flags & MSG_TRUNC)
479 err = ulen;
480
481 __skb_free_datagram_locked(sk, skb, peeking ? -err : err);
482 return err;
483
484 csum_copy_err:
485 slow = lock_sock_fast(sk);
486 if (!skb_kill_datagram(sk, skb, flags)) {
487 if (is_udp4) {
488 UDP_INC_STATS(sock_net(sk),
489 UDP_MIB_CSUMERRORS, is_udplite);
490 UDP_INC_STATS(sock_net(sk),
491 UDP_MIB_INERRORS, is_udplite);
492 } else {
493 UDP6_INC_STATS(sock_net(sk),
494 UDP_MIB_CSUMERRORS, is_udplite);
495 UDP6_INC_STATS(sock_net(sk),
496 UDP_MIB_INERRORS, is_udplite);
497 }
498 }
499 unlock_sock_fast(sk, slow);
500
501 /* starting over for a new packet, but check if we need to yield */
502 cond_resched();
503 msg->msg_flags &= ~MSG_TRUNC;
504 goto try_again;
505 }
506
507 void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
508 u8 type, u8 code, int offset, __be32 info,
509 struct udp_table *udptable)
510 {
511 struct ipv6_pinfo *np;
512 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
513 const struct in6_addr *saddr = &hdr->saddr;
514 const struct in6_addr *daddr = &hdr->daddr;
515 struct udphdr *uh = (struct udphdr *)(skb->data+offset);
516 struct sock *sk;
517 int harderr;
518 int err;
519 struct net *net = dev_net(skb->dev);
520
521 sk = __udp6_lib_lookup(net, daddr, uh->dest, saddr, uh->source,
522 inet6_iif(skb), udptable, skb);
523 if (!sk) {
524 __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev),
525 ICMP6_MIB_INERRORS);
526 return;
527 }
528
529 harderr = icmpv6_err_convert(type, code, &err);
530 np = inet6_sk(sk);
531
532 if (type == ICMPV6_PKT_TOOBIG) {
533 if (!ip6_sk_accept_pmtu(sk))
534 goto out;
535 ip6_sk_update_pmtu(skb, sk, info);
536 if (np->pmtudisc != IPV6_PMTUDISC_DONT)
537 harderr = 1;
538 }
539 if (type == NDISC_REDIRECT) {
540 ip6_sk_redirect(skb, sk);
541 goto out;
542 }
543
544 if (!np->recverr) {
545 if (!harderr || sk->sk_state != TCP_ESTABLISHED)
546 goto out;
547 } else {
548 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
549 }
550
551 sk->sk_err = err;
552 sk->sk_error_report(sk);
553 out:
554 return;
555 }
556
557 static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
558 {
559 int rc;
560
561 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
562 sock_rps_save_rxhash(sk, skb);
563 sk_mark_napi_id(sk, skb);
564 sk_incoming_cpu_update(sk);
565 }
566
567 rc = __sock_queue_rcv_skb(sk, skb);
568 if (rc < 0) {
569 int is_udplite = IS_UDPLITE(sk);
570
571 /* Note that an ENOMEM error is charged twice */
572 if (rc == -ENOMEM)
573 __UDP6_INC_STATS(sock_net(sk),
574 UDP_MIB_RCVBUFERRORS, is_udplite);
575 __UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
576 kfree_skb(skb);
577 return -1;
578 }
579 return 0;
580 }
581
582 static __inline__ void udpv6_err(struct sk_buff *skb,
583 struct inet6_skb_parm *opt, u8 type,
584 u8 code, int offset, __be32 info)
585 {
586 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table);
587 }
588
589 static struct static_key udpv6_encap_needed __read_mostly;
590 void udpv6_encap_enable(void)
591 {
592 if (!static_key_enabled(&udpv6_encap_needed))
593 static_key_slow_inc(&udpv6_encap_needed);
594 }
595 EXPORT_SYMBOL(udpv6_encap_enable);
596
597 int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
598 {
599 struct udp_sock *up = udp_sk(sk);
600 int rc;
601 int is_udplite = IS_UDPLITE(sk);
602
603 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
604 goto drop;
605
606 if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
607 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
608
609 /*
610 * This is an encapsulation socket so pass the skb to
611 * the socket's udp_encap_rcv() hook. Otherwise, just
612 * fall through and pass this up the UDP socket.
613 * up->encap_rcv() returns the following value:
614 * =0 if skb was successfully passed to the encap
615 * handler or was discarded by it.
616 * >0 if skb should be passed on to UDP.
617 * <0 if skb should be resubmitted as proto -N
618 */
619
620 /* if we're overly short, let UDP handle it */
621 encap_rcv = ACCESS_ONCE(up->encap_rcv);
622 if (skb->len > sizeof(struct udphdr) && encap_rcv) {
623 int ret;
624
625 /* Verify checksum before giving to encap */
626 if (udp_lib_checksum_complete(skb))
627 goto csum_error;
628
629 ret = encap_rcv(sk, skb);
630 if (ret <= 0) {
631 __UDP_INC_STATS(sock_net(sk),
632 UDP_MIB_INDATAGRAMS,
633 is_udplite);
634 return -ret;
635 }
636 }
637
638 /* FALLTHROUGH -- it's a UDP Packet */
639 }
640
641 /*
642 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
643 */
644 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
645
646 if (up->pcrlen == 0) { /* full coverage was set */
647 net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n",
648 UDP_SKB_CB(skb)->cscov, skb->len);
649 goto drop;
650 }
651 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
652 net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n",
653 UDP_SKB_CB(skb)->cscov, up->pcrlen);
654 goto drop;
655 }
656 }
657
658 if (rcu_access_pointer(sk->sk_filter)) {
659 if (udp_lib_checksum_complete(skb))
660 goto csum_error;
661 if (sk_filter(sk, skb))
662 goto drop;
663 }
664
665 udp_csum_pull_header(skb);
666 if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
667 __UDP6_INC_STATS(sock_net(sk),
668 UDP_MIB_RCVBUFERRORS, is_udplite);
669 goto drop;
670 }
671
672 skb_dst_drop(skb);
673
674 bh_lock_sock(sk);
675 rc = 0;
676 if (!sock_owned_by_user(sk))
677 rc = __udpv6_queue_rcv_skb(sk, skb);
678 else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
679 bh_unlock_sock(sk);
680 goto drop;
681 }
682 bh_unlock_sock(sk);
683
684 return rc;
685
686 csum_error:
687 __UDP6_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite);
688 drop:
689 __UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
690 atomic_inc(&sk->sk_drops);
691 kfree_skb(skb);
692 return -1;
693 }
694
695 static bool __udp_v6_is_mcast_sock(struct net *net, struct sock *sk,
696 __be16 loc_port, const struct in6_addr *loc_addr,
697 __be16 rmt_port, const struct in6_addr *rmt_addr,
698 int dif, unsigned short hnum)
699 {
700 struct inet_sock *inet = inet_sk(sk);
701
702 if (!net_eq(sock_net(sk), net))
703 return false;
704
705 if (udp_sk(sk)->udp_port_hash != hnum ||
706 sk->sk_family != PF_INET6 ||
707 (inet->inet_dport && inet->inet_dport != rmt_port) ||
708 (!ipv6_addr_any(&sk->sk_v6_daddr) &&
709 !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) ||
710 (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif) ||
711 (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) &&
712 !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr)))
713 return false;
714 if (!inet6_mc_check(sk, loc_addr, rmt_addr))
715 return false;
716 return true;
717 }
718
719 static void udp6_csum_zero_error(struct sk_buff *skb)
720 {
721 /* RFC 2460 section 8.1 says that we SHOULD log
722 * this error. Well, it is reasonable.
723 */
724 net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n",
725 &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source),
726 &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest));
727 }
728
729 /*
730 * Note: called only from the BH handler context,
731 * so we don't need to lock the hashes.
732 */
733 static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
734 const struct in6_addr *saddr, const struct in6_addr *daddr,
735 struct udp_table *udptable, int proto)
736 {
737 struct sock *sk, *first = NULL;
738 const struct udphdr *uh = udp_hdr(skb);
739 unsigned short hnum = ntohs(uh->dest);
740 struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum);
741 unsigned int offset = offsetof(typeof(*sk), sk_node);
742 unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10);
743 int dif = inet6_iif(skb);
744 struct hlist_node *node;
745 struct sk_buff *nskb;
746
747 if (use_hash2) {
748 hash2_any = udp6_portaddr_hash(net, &in6addr_any, hnum) &
749 udp_table.mask;
750 hash2 = udp6_portaddr_hash(net, daddr, hnum) & udp_table.mask;
751 start_lookup:
752 hslot = &udp_table.hash2[hash2];
753 offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node);
754 }
755
756 sk_for_each_entry_offset_rcu(sk, node, &hslot->head, offset) {
757 if (!__udp_v6_is_mcast_sock(net, sk, uh->dest, daddr,
758 uh->source, saddr, dif, hnum))
759 continue;
760 /* If zero checksum and no_check is not on for
761 * the socket then skip it.
762 */
763 if (!uh->check && !udp_sk(sk)->no_check6_rx)
764 continue;
765 if (!first) {
766 first = sk;
767 continue;
768 }
769 nskb = skb_clone(skb, GFP_ATOMIC);
770 if (unlikely(!nskb)) {
771 atomic_inc(&sk->sk_drops);
772 __UDP6_INC_STATS(net, UDP_MIB_RCVBUFERRORS,
773 IS_UDPLITE(sk));
774 __UDP6_INC_STATS(net, UDP_MIB_INERRORS,
775 IS_UDPLITE(sk));
776 continue;
777 }
778
779 if (udpv6_queue_rcv_skb(sk, nskb) > 0)
780 consume_skb(nskb);
781 }
782
783 /* Also lookup *:port if we are using hash2 and haven't done so yet. */
784 if (use_hash2 && hash2 != hash2_any) {
785 hash2 = hash2_any;
786 goto start_lookup;
787 }
788
789 if (first) {
790 if (udpv6_queue_rcv_skb(first, skb) > 0)
791 consume_skb(skb);
792 } else {
793 kfree_skb(skb);
794 __UDP6_INC_STATS(net, UDP_MIB_IGNOREDMULTI,
795 proto == IPPROTO_UDPLITE);
796 }
797 return 0;
798 }
799
800 int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
801 int proto)
802 {
803 const struct in6_addr *saddr, *daddr;
804 struct net *net = dev_net(skb->dev);
805 struct udphdr *uh;
806 struct sock *sk;
807 u32 ulen = 0;
808
809 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
810 goto discard;
811
812 saddr = &ipv6_hdr(skb)->saddr;
813 daddr = &ipv6_hdr(skb)->daddr;
814 uh = udp_hdr(skb);
815
816 ulen = ntohs(uh->len);
817 if (ulen > skb->len)
818 goto short_packet;
819
820 if (proto == IPPROTO_UDP) {
821 /* UDP validates ulen. */
822
823 /* Check for jumbo payload */
824 if (ulen == 0)
825 ulen = skb->len;
826
827 if (ulen < sizeof(*uh))
828 goto short_packet;
829
830 if (ulen < skb->len) {
831 if (pskb_trim_rcsum(skb, ulen))
832 goto short_packet;
833 saddr = &ipv6_hdr(skb)->saddr;
834 daddr = &ipv6_hdr(skb)->daddr;
835 uh = udp_hdr(skb);
836 }
837 }
838
839 if (udp6_csum_init(skb, uh, proto))
840 goto csum_error;
841
842 /*
843 * Multicast receive code
844 */
845 if (ipv6_addr_is_multicast(daddr))
846 return __udp6_lib_mcast_deliver(net, skb,
847 saddr, daddr, udptable, proto);
848
849 /* Unicast */
850
851 /*
852 * check socket cache ... must talk to Alan about his plans
853 * for sock caches... i'll skip this for now.
854 */
855 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
856 if (sk) {
857 int ret;
858
859 if (!uh->check && !udp_sk(sk)->no_check6_rx) {
860 udp6_csum_zero_error(skb);
861 goto csum_error;
862 }
863
864 if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk))
865 skb_checksum_try_convert(skb, IPPROTO_UDP, uh->check,
866 ip6_compute_pseudo);
867
868 ret = udpv6_queue_rcv_skb(sk, skb);
869
870 /* a return value > 0 means to resubmit the input */
871 if (ret > 0)
872 return ret;
873
874 return 0;
875 }
876
877 if (!uh->check) {
878 udp6_csum_zero_error(skb);
879 goto csum_error;
880 }
881
882 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
883 goto discard;
884
885 if (udp_lib_checksum_complete(skb))
886 goto csum_error;
887
888 __UDP6_INC_STATS(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
889 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
890
891 kfree_skb(skb);
892 return 0;
893
894 short_packet:
895 net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n",
896 proto == IPPROTO_UDPLITE ? "-Lite" : "",
897 saddr, ntohs(uh->source),
898 ulen, skb->len,
899 daddr, ntohs(uh->dest));
900 goto discard;
901 csum_error:
902 __UDP6_INC_STATS(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE);
903 discard:
904 __UDP6_INC_STATS(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
905 kfree_skb(skb);
906 return 0;
907 }
908
909 static __inline__ int udpv6_rcv(struct sk_buff *skb)
910 {
911 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP);
912 }
913
914 /*
915 * Throw away all pending data and cancel the corking. Socket is locked.
916 */
917 static void udp_v6_flush_pending_frames(struct sock *sk)
918 {
919 struct udp_sock *up = udp_sk(sk);
920
921 if (up->pending == AF_INET)
922 udp_flush_pending_frames(sk);
923 else if (up->pending) {
924 up->len = 0;
925 up->pending = 0;
926 ip6_flush_pending_frames(sk);
927 }
928 }
929
930 /**
931 * udp6_hwcsum_outgoing - handle outgoing HW checksumming
932 * @sk: socket we are sending on
933 * @skb: sk_buff containing the filled-in UDP header
934 * (checksum field must be zeroed out)
935 */
936 static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
937 const struct in6_addr *saddr,
938 const struct in6_addr *daddr, int len)
939 {
940 unsigned int offset;
941 struct udphdr *uh = udp_hdr(skb);
942 struct sk_buff *frags = skb_shinfo(skb)->frag_list;
943 __wsum csum = 0;
944
945 if (!frags) {
946 /* Only one fragment on the socket. */
947 skb->csum_start = skb_transport_header(skb) - skb->head;
948 skb->csum_offset = offsetof(struct udphdr, check);
949 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0);
950 } else {
951 /*
952 * HW-checksum won't work as there are two or more
953 * fragments on the socket so that all csums of sk_buffs
954 * should be together
955 */
956 offset = skb_transport_offset(skb);
957 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
958
959 skb->ip_summed = CHECKSUM_NONE;
960
961 do {
962 csum = csum_add(csum, frags->csum);
963 } while ((frags = frags->next));
964
965 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP,
966 csum);
967 if (uh->check == 0)
968 uh->check = CSUM_MANGLED_0;
969 }
970 }
971
972 /*
973 * Sending
974 */
975
976 static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6)
977 {
978 struct sock *sk = skb->sk;
979 struct udphdr *uh;
980 int err = 0;
981 int is_udplite = IS_UDPLITE(sk);
982 __wsum csum = 0;
983 int offset = skb_transport_offset(skb);
984 int len = skb->len - offset;
985
986 /*
987 * Create a UDP header
988 */
989 uh = udp_hdr(skb);
990 uh->source = fl6->fl6_sport;
991 uh->dest = fl6->fl6_dport;
992 uh->len = htons(len);
993 uh->check = 0;
994
995 if (is_udplite)
996 csum = udplite_csum(skb);
997 else if (udp_sk(sk)->no_check6_tx) { /* UDP csum disabled */
998 skb->ip_summed = CHECKSUM_NONE;
999 goto send;
1000 } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
1001 udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, len);
1002 goto send;
1003 } else
1004 csum = udp_csum(skb);
1005
1006 /* add protocol-dependent pseudo-header */
1007 uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
1008 len, fl6->flowi6_proto, csum);
1009 if (uh->check == 0)
1010 uh->check = CSUM_MANGLED_0;
1011
1012 send:
1013 err = ip6_send_skb(skb);
1014 if (err) {
1015 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) {
1016 UDP6_INC_STATS(sock_net(sk),
1017 UDP_MIB_SNDBUFERRORS, is_udplite);
1018 err = 0;
1019 }
1020 } else {
1021 UDP6_INC_STATS(sock_net(sk),
1022 UDP_MIB_OUTDATAGRAMS, is_udplite);
1023 }
1024 return err;
1025 }
1026
1027 static int udp_v6_push_pending_frames(struct sock *sk)
1028 {
1029 struct sk_buff *skb;
1030 struct udp_sock *up = udp_sk(sk);
1031 struct flowi6 fl6;
1032 int err = 0;
1033
1034 if (up->pending == AF_INET)
1035 return udp_push_pending_frames(sk);
1036
1037 /* ip6_finish_skb will release the cork, so make a copy of
1038 * fl6 here.
1039 */
1040 fl6 = inet_sk(sk)->cork.fl.u.ip6;
1041
1042 skb = ip6_finish_skb(sk);
1043 if (!skb)
1044 goto out;
1045
1046 err = udp_v6_send_skb(skb, &fl6);
1047
1048 out:
1049 up->len = 0;
1050 up->pending = 0;
1051 return err;
1052 }
1053
1054 int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
1055 {
1056 struct ipv6_txoptions opt_space;
1057 struct udp_sock *up = udp_sk(sk);
1058 struct inet_sock *inet = inet_sk(sk);
1059 struct ipv6_pinfo *np = inet6_sk(sk);
1060 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
1061 struct in6_addr *daddr, *final_p, final;
1062 struct ipv6_txoptions *opt = NULL;
1063 struct ipv6_txoptions *opt_to_free = NULL;
1064 struct ip6_flowlabel *flowlabel = NULL;
1065 struct flowi6 fl6;
1066 struct dst_entry *dst;
1067 int addr_len = msg->msg_namelen;
1068 int ulen = len;
1069 int hlimit = -1;
1070 int tclass = -1;
1071 int dontfrag = -1;
1072 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
1073 int err;
1074 int connected = 0;
1075 int is_udplite = IS_UDPLITE(sk);
1076 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
1077 struct sockcm_cookie sockc;
1078
1079 /* destination address check */
1080 if (sin6) {
1081 if (addr_len < offsetof(struct sockaddr, sa_data))
1082 return -EINVAL;
1083
1084 switch (sin6->sin6_family) {
1085 case AF_INET6:
1086 if (addr_len < SIN6_LEN_RFC2133)
1087 return -EINVAL;
1088 daddr = &sin6->sin6_addr;
1089 break;
1090 case AF_INET:
1091 goto do_udp_sendmsg;
1092 case AF_UNSPEC:
1093 msg->msg_name = sin6 = NULL;
1094 msg->msg_namelen = addr_len = 0;
1095 daddr = NULL;
1096 break;
1097 default:
1098 return -EINVAL;
1099 }
1100 } else if (!up->pending) {
1101 if (sk->sk_state != TCP_ESTABLISHED)
1102 return -EDESTADDRREQ;
1103 daddr = &sk->sk_v6_daddr;
1104 } else
1105 daddr = NULL;
1106
1107 if (daddr) {
1108 if (ipv6_addr_v4mapped(daddr)) {
1109 struct sockaddr_in sin;
1110 sin.sin_family = AF_INET;
1111 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport;
1112 sin.sin_addr.s_addr = daddr->s6_addr32[3];
1113 msg->msg_name = &sin;
1114 msg->msg_namelen = sizeof(sin);
1115 do_udp_sendmsg:
1116 if (__ipv6_only_sock(sk))
1117 return -ENETUNREACH;
1118 return udp_sendmsg(sk, msg, len);
1119 }
1120 }
1121
1122 if (up->pending == AF_INET)
1123 return udp_sendmsg(sk, msg, len);
1124
1125 /* Rough check on arithmetic overflow,
1126 better check is made in ip6_append_data().
1127 */
1128 if (len > INT_MAX - sizeof(struct udphdr))
1129 return -EMSGSIZE;
1130
1131 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
1132 if (up->pending) {
1133 /*
1134 * There are pending frames.
1135 * The socket lock must be held while it's corked.
1136 */
1137 lock_sock(sk);
1138 if (likely(up->pending)) {
1139 if (unlikely(up->pending != AF_INET6)) {
1140 release_sock(sk);
1141 return -EAFNOSUPPORT;
1142 }
1143 dst = NULL;
1144 goto do_append_data;
1145 }
1146 release_sock(sk);
1147 }
1148 ulen += sizeof(struct udphdr);
1149
1150 memset(&fl6, 0, sizeof(fl6));
1151
1152 if (sin6) {
1153 if (sin6->sin6_port == 0)
1154 return -EINVAL;
1155
1156 fl6.fl6_dport = sin6->sin6_port;
1157 daddr = &sin6->sin6_addr;
1158
1159 if (np->sndflow) {
1160 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
1161 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
1162 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1163 if (!flowlabel)
1164 return -EINVAL;
1165 }
1166 }
1167
1168 /*
1169 * Otherwise it will be difficult to maintain
1170 * sk->sk_dst_cache.
1171 */
1172 if (sk->sk_state == TCP_ESTABLISHED &&
1173 ipv6_addr_equal(daddr, &sk->sk_v6_daddr))
1174 daddr = &sk->sk_v6_daddr;
1175
1176 if (addr_len >= sizeof(struct sockaddr_in6) &&
1177 sin6->sin6_scope_id &&
1178 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
1179 fl6.flowi6_oif = sin6->sin6_scope_id;
1180 } else {
1181 if (sk->sk_state != TCP_ESTABLISHED)
1182 return -EDESTADDRREQ;
1183
1184 fl6.fl6_dport = inet->inet_dport;
1185 daddr = &sk->sk_v6_daddr;
1186 fl6.flowlabel = np->flow_label;
1187 connected = 1;
1188 }
1189
1190 if (!fl6.flowi6_oif)
1191 fl6.flowi6_oif = sk->sk_bound_dev_if;
1192
1193 if (!fl6.flowi6_oif)
1194 fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex;
1195
1196 fl6.flowi6_mark = sk->sk_mark;
1197 sockc.tsflags = sk->sk_tsflags;
1198
1199 if (msg->msg_controllen) {
1200 opt = &opt_space;
1201 memset(opt, 0, sizeof(struct ipv6_txoptions));
1202 opt->tot_len = sizeof(*opt);
1203
1204 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt,
1205 &hlimit, &tclass, &dontfrag,
1206 &sockc);
1207 if (err < 0) {
1208 fl6_sock_release(flowlabel);
1209 return err;
1210 }
1211 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
1212 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1213 if (!flowlabel)
1214 return -EINVAL;
1215 }
1216 if (!(opt->opt_nflen|opt->opt_flen))
1217 opt = NULL;
1218 connected = 0;
1219 }
1220 if (!opt) {
1221 opt = txopt_get(np);
1222 opt_to_free = opt;
1223 }
1224 if (flowlabel)
1225 opt = fl6_merge_options(&opt_space, flowlabel, opt);
1226 opt = ipv6_fixup_options(&opt_space, opt);
1227
1228 fl6.flowi6_proto = sk->sk_protocol;
1229 if (!ipv6_addr_any(daddr))
1230 fl6.daddr = *daddr;
1231 else
1232 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
1233 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
1234 fl6.saddr = np->saddr;
1235 fl6.fl6_sport = inet->inet_sport;
1236
1237 final_p = fl6_update_dst(&fl6, opt, &final);
1238 if (final_p)
1239 connected = 0;
1240
1241 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) {
1242 fl6.flowi6_oif = np->mcast_oif;
1243 connected = 0;
1244 } else if (!fl6.flowi6_oif)
1245 fl6.flowi6_oif = np->ucast_oif;
1246
1247 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
1248
1249 dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p);
1250 if (IS_ERR(dst)) {
1251 err = PTR_ERR(dst);
1252 dst = NULL;
1253 goto out;
1254 }
1255
1256 if (hlimit < 0)
1257 hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
1258
1259 if (tclass < 0)
1260 tclass = np->tclass;
1261
1262 if (msg->msg_flags&MSG_CONFIRM)
1263 goto do_confirm;
1264 back_from_confirm:
1265
1266 /* Lockless fast path for the non-corking case */
1267 if (!corkreq) {
1268 struct sk_buff *skb;
1269
1270 skb = ip6_make_skb(sk, getfrag, msg, ulen,
1271 sizeof(struct udphdr), hlimit, tclass, opt,
1272 &fl6, (struct rt6_info *)dst,
1273 msg->msg_flags, dontfrag, &sockc);
1274 err = PTR_ERR(skb);
1275 if (!IS_ERR_OR_NULL(skb))
1276 err = udp_v6_send_skb(skb, &fl6);
1277 goto release_dst;
1278 }
1279
1280 lock_sock(sk);
1281 if (unlikely(up->pending)) {
1282 /* The socket is already corked while preparing it. */
1283 /* ... which is an evident application bug. --ANK */
1284 release_sock(sk);
1285
1286 net_dbg_ratelimited("udp cork app bug 2\n");
1287 err = -EINVAL;
1288 goto out;
1289 }
1290
1291 up->pending = AF_INET6;
1292
1293 do_append_data:
1294 if (dontfrag < 0)
1295 dontfrag = np->dontfrag;
1296 up->len += ulen;
1297 err = ip6_append_data(sk, getfrag, msg, ulen,
1298 sizeof(struct udphdr), hlimit, tclass, opt, &fl6,
1299 (struct rt6_info *)dst,
1300 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, dontfrag,
1301 &sockc);
1302 if (err)
1303 udp_v6_flush_pending_frames(sk);
1304 else if (!corkreq)
1305 err = udp_v6_push_pending_frames(sk);
1306 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
1307 up->pending = 0;
1308
1309 if (err > 0)
1310 err = np->recverr ? net_xmit_errno(err) : 0;
1311 release_sock(sk);
1312
1313 release_dst:
1314 if (dst) {
1315 if (connected) {
1316 ip6_dst_store(sk, dst,
1317 ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ?
1318 &sk->sk_v6_daddr : NULL,
1319 #ifdef CONFIG_IPV6_SUBTREES
1320 ipv6_addr_equal(&fl6.saddr, &np->saddr) ?
1321 &np->saddr :
1322 #endif
1323 NULL);
1324 } else {
1325 dst_release(dst);
1326 }
1327 dst = NULL;
1328 }
1329
1330 out:
1331 dst_release(dst);
1332 fl6_sock_release(flowlabel);
1333 txopt_put(opt_to_free);
1334 if (!err)
1335 return len;
1336 /*
1337 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
1338 * ENOBUFS might not be good (it's not tunable per se), but otherwise
1339 * we don't have a good statistic (IpOutDiscards but it can be too many
1340 * things). We could add another new stat but at least for now that
1341 * seems like overkill.
1342 */
1343 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
1344 UDP6_INC_STATS(sock_net(sk),
1345 UDP_MIB_SNDBUFERRORS, is_udplite);
1346 }
1347 return err;
1348
1349 do_confirm:
1350 dst_confirm(dst);
1351 if (!(msg->msg_flags&MSG_PROBE) || len)
1352 goto back_from_confirm;
1353 err = 0;
1354 goto out;
1355 }
1356
1357 void udpv6_destroy_sock(struct sock *sk)
1358 {
1359 struct udp_sock *up = udp_sk(sk);
1360 lock_sock(sk);
1361 udp_v6_flush_pending_frames(sk);
1362 release_sock(sk);
1363
1364 if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
1365 void (*encap_destroy)(struct sock *sk);
1366 encap_destroy = ACCESS_ONCE(up->encap_destroy);
1367 if (encap_destroy)
1368 encap_destroy(sk);
1369 }
1370
1371 inet6_destroy_sock(sk);
1372 }
1373
1374 /*
1375 * Socket option code for UDP
1376 */
1377 int udpv6_setsockopt(struct sock *sk, int level, int optname,
1378 char __user *optval, unsigned int optlen)
1379 {
1380 if (level == SOL_UDP || level == SOL_UDPLITE)
1381 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1382 udp_v6_push_pending_frames);
1383 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1384 }
1385
1386 #ifdef CONFIG_COMPAT
1387 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
1388 char __user *optval, unsigned int optlen)
1389 {
1390 if (level == SOL_UDP || level == SOL_UDPLITE)
1391 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1392 udp_v6_push_pending_frames);
1393 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
1394 }
1395 #endif
1396
1397 int udpv6_getsockopt(struct sock *sk, int level, int optname,
1398 char __user *optval, int __user *optlen)
1399 {
1400 if (level == SOL_UDP || level == SOL_UDPLITE)
1401 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1402 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1403 }
1404
1405 #ifdef CONFIG_COMPAT
1406 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
1407 char __user *optval, int __user *optlen)
1408 {
1409 if (level == SOL_UDP || level == SOL_UDPLITE)
1410 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1411 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
1412 }
1413 #endif
1414
1415 static const struct inet6_protocol udpv6_protocol = {
1416 .handler = udpv6_rcv,
1417 .err_handler = udpv6_err,
1418 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1419 };
1420
1421 /* ------------------------------------------------------------------------ */
1422 #ifdef CONFIG_PROC_FS
1423 int udp6_seq_show(struct seq_file *seq, void *v)
1424 {
1425 if (v == SEQ_START_TOKEN) {
1426 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
1427 } else {
1428 int bucket = ((struct udp_iter_state *)seq->private)->bucket;
1429 struct inet_sock *inet = inet_sk(v);
1430 __u16 srcp = ntohs(inet->inet_sport);
1431 __u16 destp = ntohs(inet->inet_dport);
1432 ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket);
1433 }
1434 return 0;
1435 }
1436
1437 static const struct file_operations udp6_afinfo_seq_fops = {
1438 .owner = THIS_MODULE,
1439 .open = udp_seq_open,
1440 .read = seq_read,
1441 .llseek = seq_lseek,
1442 .release = seq_release_net
1443 };
1444
1445 static struct udp_seq_afinfo udp6_seq_afinfo = {
1446 .name = "udp6",
1447 .family = AF_INET6,
1448 .udp_table = &udp_table,
1449 .seq_fops = &udp6_afinfo_seq_fops,
1450 .seq_ops = {
1451 .show = udp6_seq_show,
1452 },
1453 };
1454
1455 int __net_init udp6_proc_init(struct net *net)
1456 {
1457 return udp_proc_register(net, &udp6_seq_afinfo);
1458 }
1459
1460 void udp6_proc_exit(struct net *net)
1461 {
1462 udp_proc_unregister(net, &udp6_seq_afinfo);
1463 }
1464 #endif /* CONFIG_PROC_FS */
1465
1466 void udp_v6_clear_sk(struct sock *sk, int size)
1467 {
1468 struct inet_sock *inet = inet_sk(sk);
1469
1470 /* we do not want to clear pinet6 field, because of RCU lookups */
1471 sk_prot_clear_portaddr_nulls(sk, offsetof(struct inet_sock, pinet6));
1472
1473 size -= offsetof(struct inet_sock, pinet6) + sizeof(inet->pinet6);
1474 memset(&inet->pinet6 + 1, 0, size);
1475 }
1476
1477 /* ------------------------------------------------------------------------ */
1478
1479 struct proto udpv6_prot = {
1480 .name = "UDPv6",
1481 .owner = THIS_MODULE,
1482 .close = udp_lib_close,
1483 .connect = ip6_datagram_connect,
1484 .disconnect = udp_disconnect,
1485 .ioctl = udp_ioctl,
1486 .destroy = udpv6_destroy_sock,
1487 .setsockopt = udpv6_setsockopt,
1488 .getsockopt = udpv6_getsockopt,
1489 .sendmsg = udpv6_sendmsg,
1490 .recvmsg = udpv6_recvmsg,
1491 .backlog_rcv = __udpv6_queue_rcv_skb,
1492 .release_cb = ip6_datagram_release_cb,
1493 .hash = udp_lib_hash,
1494 .unhash = udp_lib_unhash,
1495 .rehash = udp_v6_rehash,
1496 .get_port = udp_v6_get_port,
1497 .memory_allocated = &udp_memory_allocated,
1498 .sysctl_mem = sysctl_udp_mem,
1499 .sysctl_wmem = &sysctl_udp_wmem_min,
1500 .sysctl_rmem = &sysctl_udp_rmem_min,
1501 .obj_size = sizeof(struct udp6_sock),
1502 .slab_flags = SLAB_DESTROY_BY_RCU,
1503 .h.udp_table = &udp_table,
1504 #ifdef CONFIG_COMPAT
1505 .compat_setsockopt = compat_udpv6_setsockopt,
1506 .compat_getsockopt = compat_udpv6_getsockopt,
1507 #endif
1508 .clear_sk = udp_v6_clear_sk,
1509 };
1510
1511 static struct inet_protosw udpv6_protosw = {
1512 .type = SOCK_DGRAM,
1513 .protocol = IPPROTO_UDP,
1514 .prot = &udpv6_prot,
1515 .ops = &inet6_dgram_ops,
1516 .flags = INET_PROTOSW_PERMANENT,
1517 };
1518
1519 int __init udpv6_init(void)
1520 {
1521 int ret;
1522
1523 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
1524 if (ret)
1525 goto out;
1526
1527 ret = inet6_register_protosw(&udpv6_protosw);
1528 if (ret)
1529 goto out_udpv6_protocol;
1530 out:
1531 return ret;
1532
1533 out_udpv6_protocol:
1534 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1535 goto out;
1536 }
1537
1538 void udpv6_exit(void)
1539 {
1540 inet6_unregister_protosw(&udpv6_protosw);
1541 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1542 }
Linux kernel - Deliverables
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