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Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
[linux/fpc-iii.git] / net / ipv6 / udp.c
blob2da1896af93496cc58762c67b4cd4b4f42924901
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 const struct ipv6hdr *iph = ipv6_hdr(skb);
319 struct sock *sk;
320
321 sk = skb_steal_sock(skb);
322 if (unlikely(sk))
323 return sk;
324 return __udp6_lib_lookup(dev_net(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
334 return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport,
335 &iph->daddr, dport, inet6_iif(skb),
336 &udp_table, skb);
337 }
338 EXPORT_SYMBOL_GPL(udp6_lib_lookup_skb);
339
340 /* Must be called under rcu_read_lock().
341 * Does increment socket refcount.
342 */
343 #if IS_ENABLED(CONFIG_NETFILTER_XT_MATCH_SOCKET) || \
344 IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TPROXY)
345 struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport,
346 const struct in6_addr *daddr, __be16 dport, int dif)
347 {
348 struct sock *sk;
349
350 sk = __udp6_lib_lookup(net, saddr, sport, daddr, dport,
351 dif, &udp_table, NULL);
352 if (sk && !atomic_inc_not_zero(&sk->sk_refcnt))
353 sk = NULL;
354 return sk;
355 }
356 EXPORT_SYMBOL_GPL(udp6_lib_lookup);
357 #endif
358
359 /*
360 * This should be easy, if there is something there we
361 * return it, otherwise we block.
362 */
363
364 int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
365 int noblock, int flags, int *addr_len)
366 {
367 struct ipv6_pinfo *np = inet6_sk(sk);
368 struct inet_sock *inet = inet_sk(sk);
369 struct sk_buff *skb;
370 unsigned int ulen, copied;
371 int peeked, peeking, off;
372 int err;
373 int is_udplite = IS_UDPLITE(sk);
374 bool checksum_valid = false;
375 int is_udp4;
376 bool slow;
377
378 if (flags & MSG_ERRQUEUE)
379 return ipv6_recv_error(sk, msg, len, addr_len);
380
381 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
382 return ipv6_recv_rxpmtu(sk, msg, len, addr_len);
383
384 try_again:
385 peeking = off = sk_peek_offset(sk, flags);
386 skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),
387 &peeked, &off, &err);
388 if (!skb)
389 return err;
390
391 ulen = skb->len;
392 copied = len;
393 if (copied > ulen - off)
394 copied = ulen - off;
395 else if (copied < ulen)
396 msg->msg_flags |= MSG_TRUNC;
397
398 is_udp4 = (skb->protocol == htons(ETH_P_IP));
399
400 /*
401 * If checksum is needed at all, try to do it while copying the
402 * data. If the data is truncated, or if we only want a partial
403 * coverage checksum (UDP-Lite), do it before the copy.
404 */
405
406 if (copied < ulen || UDP_SKB_CB(skb)->partial_cov || peeking) {
407 checksum_valid = !udp_lib_checksum_complete(skb);
408 if (!checksum_valid)
409 goto csum_copy_err;
410 }
411
412 if (checksum_valid || skb_csum_unnecessary(skb))
413 err = skb_copy_datagram_msg(skb, off, msg, copied);
414 else {
415 err = skb_copy_and_csum_datagram_msg(skb, off, msg);
416 if (err == -EINVAL)
417 goto csum_copy_err;
418 }
419 if (unlikely(err)) {
420 trace_kfree_skb(skb, udpv6_recvmsg);
421 if (!peeked) {
422 atomic_inc(&sk->sk_drops);
423 if (is_udp4)
424 UDP_INC_STATS(sock_net(sk), UDP_MIB_INERRORS,
425 is_udplite);
426 else
427 UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS,
428 is_udplite);
429 }
430 skb_free_datagram_locked(sk, skb);
431 return err;
432 }
433 if (!peeked) {
434 if (is_udp4)
435 UDP_INC_STATS(sock_net(sk), UDP_MIB_INDATAGRAMS,
436 is_udplite);
437 else
438 UDP6_INC_STATS(sock_net(sk), UDP_MIB_INDATAGRAMS,
439 is_udplite);
440 }
441
442 sock_recv_ts_and_drops(msg, sk, skb);
443
444 /* Copy the address. */
445 if (msg->msg_name) {
446 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
447 sin6->sin6_family = AF_INET6;
448 sin6->sin6_port = udp_hdr(skb)->source;
449 sin6->sin6_flowinfo = 0;
450
451 if (is_udp4) {
452 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
453 &sin6->sin6_addr);
454 sin6->sin6_scope_id = 0;
455 } else {
456 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
457 sin6->sin6_scope_id =
458 ipv6_iface_scope_id(&sin6->sin6_addr,
459 inet6_iif(skb));
460 }
461 *addr_len = sizeof(*sin6);
462 }
463
464 if (np->rxopt.all)
465 ip6_datagram_recv_common_ctl(sk, msg, skb);
466
467 if (is_udp4) {
468 if (inet->cmsg_flags)
469 ip_cmsg_recv(msg, skb);
470 } else {
471 if (np->rxopt.all)
472 ip6_datagram_recv_specific_ctl(sk, msg, skb);
473 }
474
475 err = copied;
476 if (flags & MSG_TRUNC)
477 err = ulen;
478
479 __skb_free_datagram_locked(sk, skb, peeking ? -err : err);
480 return err;
481
482 csum_copy_err:
483 slow = lock_sock_fast(sk);
484 if (!skb_kill_datagram(sk, skb, flags)) {
485 if (is_udp4) {
486 UDP_INC_STATS(sock_net(sk),
487 UDP_MIB_CSUMERRORS, is_udplite);
488 UDP_INC_STATS(sock_net(sk),
489 UDP_MIB_INERRORS, is_udplite);
490 } else {
491 UDP6_INC_STATS(sock_net(sk),
492 UDP_MIB_CSUMERRORS, is_udplite);
493 UDP6_INC_STATS(sock_net(sk),
494 UDP_MIB_INERRORS, is_udplite);
495 }
496 }
497 unlock_sock_fast(sk, slow);
498
499 /* starting over for a new packet, but check if we need to yield */
500 cond_resched();
501 msg->msg_flags &= ~MSG_TRUNC;
502 goto try_again;
503 }
504
505 void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
506 u8 type, u8 code, int offset, __be32 info,
507 struct udp_table *udptable)
508 {
509 struct ipv6_pinfo *np;
510 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
511 const struct in6_addr *saddr = &hdr->saddr;
512 const struct in6_addr *daddr = &hdr->daddr;
513 struct udphdr *uh = (struct udphdr *)(skb->data+offset);
514 struct sock *sk;
515 int harderr;
516 int err;
517 struct net *net = dev_net(skb->dev);
518
519 sk = __udp6_lib_lookup(net, daddr, uh->dest, saddr, uh->source,
520 inet6_iif(skb), udptable, skb);
521 if (!sk) {
522 __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev),
523 ICMP6_MIB_INERRORS);
524 return;
525 }
526
527 harderr = icmpv6_err_convert(type, code, &err);
528 np = inet6_sk(sk);
529
530 if (type == ICMPV6_PKT_TOOBIG) {
531 if (!ip6_sk_accept_pmtu(sk))
532 goto out;
533 ip6_sk_update_pmtu(skb, sk, info);
534 if (np->pmtudisc != IPV6_PMTUDISC_DONT)
535 harderr = 1;
536 }
537 if (type == NDISC_REDIRECT) {
538 ip6_sk_redirect(skb, sk);
539 goto out;
540 }
541
542 if (!np->recverr) {
543 if (!harderr || sk->sk_state != TCP_ESTABLISHED)
544 goto out;
545 } else {
546 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
547 }
548
549 sk->sk_err = err;
550 sk->sk_error_report(sk);
551 out:
552 return;
553 }
554
555 static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
556 {
557 int rc;
558
559 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
560 sock_rps_save_rxhash(sk, skb);
561 sk_mark_napi_id(sk, skb);
562 sk_incoming_cpu_update(sk);
563 }
564
565 rc = __sock_queue_rcv_skb(sk, skb);
566 if (rc < 0) {
567 int is_udplite = IS_UDPLITE(sk);
568
569 /* Note that an ENOMEM error is charged twice */
570 if (rc == -ENOMEM)
571 UDP6_INC_STATS(sock_net(sk),
572 UDP_MIB_RCVBUFERRORS, is_udplite);
573 UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
574 kfree_skb(skb);
575 return -1;
576 }
577 return 0;
578 }
579
580 static __inline__ void udpv6_err(struct sk_buff *skb,
581 struct inet6_skb_parm *opt, u8 type,
582 u8 code, int offset, __be32 info)
583 {
584 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table);
585 }
586
587 static struct static_key udpv6_encap_needed __read_mostly;
588 void udpv6_encap_enable(void)
589 {
590 if (!static_key_enabled(&udpv6_encap_needed))
591 static_key_slow_inc(&udpv6_encap_needed);
592 }
593 EXPORT_SYMBOL(udpv6_encap_enable);
594
595 int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
596 {
597 struct udp_sock *up = udp_sk(sk);
598 int rc;
599 int is_udplite = IS_UDPLITE(sk);
600
601 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
602 goto drop;
603
604 if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
605 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
606
607 /*
608 * This is an encapsulation socket so pass the skb to
609 * the socket's udp_encap_rcv() hook. Otherwise, just
610 * fall through and pass this up the UDP socket.
611 * up->encap_rcv() returns the following value:
612 * =0 if skb was successfully passed to the encap
613 * handler or was discarded by it.
614 * >0 if skb should be passed on to UDP.
615 * <0 if skb should be resubmitted as proto -N
616 */
617
618 /* if we're overly short, let UDP handle it */
619 encap_rcv = ACCESS_ONCE(up->encap_rcv);
620 if (encap_rcv) {
621 int ret;
622
623 /* Verify checksum before giving to encap */
624 if (udp_lib_checksum_complete(skb))
625 goto csum_error;
626
627 ret = encap_rcv(sk, skb);
628 if (ret <= 0) {
629 __UDP_INC_STATS(sock_net(sk),
630 UDP_MIB_INDATAGRAMS,
631 is_udplite);
632 return -ret;
633 }
634 }
635
636 /* FALLTHROUGH -- it's a UDP Packet */
637 }
638
639 /*
640 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
641 */
642 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
643
644 if (up->pcrlen == 0) { /* full coverage was set */
645 net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n",
646 UDP_SKB_CB(skb)->cscov, skb->len);
647 goto drop;
648 }
649 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
650 net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n",
651 UDP_SKB_CB(skb)->cscov, up->pcrlen);
652 goto drop;
653 }
654 }
655
656 if (rcu_access_pointer(sk->sk_filter)) {
657 if (udp_lib_checksum_complete(skb))
658 goto csum_error;
659 if (sk_filter(sk, skb))
660 goto drop;
661 }
662
663 udp_csum_pull_header(skb);
664 if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
665 __UDP6_INC_STATS(sock_net(sk),
666 UDP_MIB_RCVBUFERRORS, is_udplite);
667 goto drop;
668 }
669
670 skb_dst_drop(skb);
671
672 bh_lock_sock(sk);
673 rc = 0;
674 if (!sock_owned_by_user(sk))
675 rc = __udpv6_queue_rcv_skb(sk, skb);
676 else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
677 bh_unlock_sock(sk);
678 goto drop;
679 }
680 bh_unlock_sock(sk);
681
682 return rc;
683
684 csum_error:
685 __UDP6_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite);
686 drop:
687 __UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
688 atomic_inc(&sk->sk_drops);
689 kfree_skb(skb);
690 return -1;
691 }
692
693 static bool __udp_v6_is_mcast_sock(struct net *net, struct sock *sk,
694 __be16 loc_port, const struct in6_addr *loc_addr,
695 __be16 rmt_port, const struct in6_addr *rmt_addr,
696 int dif, unsigned short hnum)
697 {
698 struct inet_sock *inet = inet_sk(sk);
699
700 if (!net_eq(sock_net(sk), net))
701 return false;
702
703 if (udp_sk(sk)->udp_port_hash != hnum ||
704 sk->sk_family != PF_INET6 ||
705 (inet->inet_dport && inet->inet_dport != rmt_port) ||
706 (!ipv6_addr_any(&sk->sk_v6_daddr) &&
707 !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) ||
708 (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif) ||
709 (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) &&
710 !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr)))
711 return false;
712 if (!inet6_mc_check(sk, loc_addr, rmt_addr))
713 return false;
714 return true;
715 }
716
717 static void udp6_csum_zero_error(struct sk_buff *skb)
718 {
719 /* RFC 2460 section 8.1 says that we SHOULD log
720 * this error. Well, it is reasonable.
721 */
722 net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n",
723 &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source),
724 &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest));
725 }
726
727 /*
728 * Note: called only from the BH handler context,
729 * so we don't need to lock the hashes.
730 */
731 static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
732 const struct in6_addr *saddr, const struct in6_addr *daddr,
733 struct udp_table *udptable, int proto)
734 {
735 struct sock *sk, *first = NULL;
736 const struct udphdr *uh = udp_hdr(skb);
737 unsigned short hnum = ntohs(uh->dest);
738 struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum);
739 unsigned int offset = offsetof(typeof(*sk), sk_node);
740 unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10);
741 int dif = inet6_iif(skb);
742 struct hlist_node *node;
743 struct sk_buff *nskb;
744
745 if (use_hash2) {
746 hash2_any = udp6_portaddr_hash(net, &in6addr_any, hnum) &
747 udp_table.mask;
748 hash2 = udp6_portaddr_hash(net, daddr, hnum) & udp_table.mask;
749 start_lookup:
750 hslot = &udp_table.hash2[hash2];
751 offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node);
752 }
753
754 sk_for_each_entry_offset_rcu(sk, node, &hslot->head, offset) {
755 if (!__udp_v6_is_mcast_sock(net, sk, uh->dest, daddr,
756 uh->source, saddr, dif, hnum))
757 continue;
758 /* If zero checksum and no_check is not on for
759 * the socket then skip it.
760 */
761 if (!uh->check && !udp_sk(sk)->no_check6_rx)
762 continue;
763 if (!first) {
764 first = sk;
765 continue;
766 }
767 nskb = skb_clone(skb, GFP_ATOMIC);
768 if (unlikely(!nskb)) {
769 atomic_inc(&sk->sk_drops);
770 __UDP6_INC_STATS(net, UDP_MIB_RCVBUFERRORS,
771 IS_UDPLITE(sk));
772 __UDP6_INC_STATS(net, UDP_MIB_INERRORS,
773 IS_UDPLITE(sk));
774 continue;
775 }
776
777 if (udpv6_queue_rcv_skb(sk, nskb) > 0)
778 consume_skb(nskb);
779 }
780
781 /* Also lookup *:port if we are using hash2 and haven't done so yet. */
782 if (use_hash2 && hash2 != hash2_any) {
783 hash2 = hash2_any;
784 goto start_lookup;
785 }
786
787 if (first) {
788 if (udpv6_queue_rcv_skb(first, skb) > 0)
789 consume_skb(skb);
790 } else {
791 kfree_skb(skb);
792 __UDP6_INC_STATS(net, UDP_MIB_IGNOREDMULTI,
793 proto == IPPROTO_UDPLITE);
794 }
795 return 0;
796 }
797
798 int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
799 int proto)
800 {
801 const struct in6_addr *saddr, *daddr;
802 struct net *net = dev_net(skb->dev);
803 struct udphdr *uh;
804 struct sock *sk;
805 u32 ulen = 0;
806
807 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
808 goto discard;
809
810 saddr = &ipv6_hdr(skb)->saddr;
811 daddr = &ipv6_hdr(skb)->daddr;
812 uh = udp_hdr(skb);
813
814 ulen = ntohs(uh->len);
815 if (ulen > skb->len)
816 goto short_packet;
817
818 if (proto == IPPROTO_UDP) {
819 /* UDP validates ulen. */
820
821 /* Check for jumbo payload */
822 if (ulen == 0)
823 ulen = skb->len;
824
825 if (ulen < sizeof(*uh))
826 goto short_packet;
827
828 if (ulen < skb->len) {
829 if (pskb_trim_rcsum(skb, ulen))
830 goto short_packet;
831 saddr = &ipv6_hdr(skb)->saddr;
832 daddr = &ipv6_hdr(skb)->daddr;
833 uh = udp_hdr(skb);
834 }
835 }
836
837 if (udp6_csum_init(skb, uh, proto))
838 goto csum_error;
839
840 /*
841 * Multicast receive code
842 */
843 if (ipv6_addr_is_multicast(daddr))
844 return __udp6_lib_mcast_deliver(net, skb,
845 saddr, daddr, udptable, proto);
846
847 /* Unicast */
848
849 /*
850 * check socket cache ... must talk to Alan about his plans
851 * for sock caches... i'll skip this for now.
852 */
853 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
854 if (sk) {
855 int ret;
856
857 if (!uh->check && !udp_sk(sk)->no_check6_rx) {
858 udp6_csum_zero_error(skb);
859 goto csum_error;
860 }
861
862 if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk))
863 skb_checksum_try_convert(skb, IPPROTO_UDP, uh->check,
864 ip6_compute_pseudo);
865
866 ret = udpv6_queue_rcv_skb(sk, skb);
867
868 /* a return value > 0 means to resubmit the input */
869 if (ret > 0)
870 return ret;
871
872 return 0;
873 }
874
875 if (!uh->check) {
876 udp6_csum_zero_error(skb);
877 goto csum_error;
878 }
879
880 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
881 goto discard;
882
883 if (udp_lib_checksum_complete(skb))
884 goto csum_error;
885
886 __UDP6_INC_STATS(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
887 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
888
889 kfree_skb(skb);
890 return 0;
891
892 short_packet:
893 net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n",
894 proto == IPPROTO_UDPLITE ? "-Lite" : "",
895 saddr, ntohs(uh->source),
896 ulen, skb->len,
897 daddr, ntohs(uh->dest));
898 goto discard;
899 csum_error:
900 __UDP6_INC_STATS(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE);
901 discard:
902 __UDP6_INC_STATS(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
903 kfree_skb(skb);
904 return 0;
905 }
906
907 static __inline__ int udpv6_rcv(struct sk_buff *skb)
908 {
909 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP);
910 }
911
912 /*
913 * Throw away all pending data and cancel the corking. Socket is locked.
914 */
915 static void udp_v6_flush_pending_frames(struct sock *sk)
916 {
917 struct udp_sock *up = udp_sk(sk);
918
919 if (up->pending == AF_INET)
920 udp_flush_pending_frames(sk);
921 else if (up->pending) {
922 up->len = 0;
923 up->pending = 0;
924 ip6_flush_pending_frames(sk);
925 }
926 }
927
928 /**
929 * udp6_hwcsum_outgoing - handle outgoing HW checksumming
930 * @sk: socket we are sending on
931 * @skb: sk_buff containing the filled-in UDP header
932 * (checksum field must be zeroed out)
933 */
934 static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
935 const struct in6_addr *saddr,
936 const struct in6_addr *daddr, int len)
937 {
938 unsigned int offset;
939 struct udphdr *uh = udp_hdr(skb);
940 struct sk_buff *frags = skb_shinfo(skb)->frag_list;
941 __wsum csum = 0;
942
943 if (!frags) {
944 /* Only one fragment on the socket. */
945 skb->csum_start = skb_transport_header(skb) - skb->head;
946 skb->csum_offset = offsetof(struct udphdr, check);
947 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0);
948 } else {
949 /*
950 * HW-checksum won't work as there are two or more
951 * fragments on the socket so that all csums of sk_buffs
952 * should be together
953 */
954 offset = skb_transport_offset(skb);
955 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
956
957 skb->ip_summed = CHECKSUM_NONE;
958
959 do {
960 csum = csum_add(csum, frags->csum);
961 } while ((frags = frags->next));
962
963 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP,
964 csum);
965 if (uh->check == 0)
966 uh->check = CSUM_MANGLED_0;
967 }
968 }
969
970 /*
971 * Sending
972 */
973
974 static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6)
975 {
976 struct sock *sk = skb->sk;
977 struct udphdr *uh;
978 int err = 0;
979 int is_udplite = IS_UDPLITE(sk);
980 __wsum csum = 0;
981 int offset = skb_transport_offset(skb);
982 int len = skb->len - offset;
983
984 /*
985 * Create a UDP header
986 */
987 uh = udp_hdr(skb);
988 uh->source = fl6->fl6_sport;
989 uh->dest = fl6->fl6_dport;
990 uh->len = htons(len);
991 uh->check = 0;
992
993 if (is_udplite)
994 csum = udplite_csum(skb);
995 else if (udp_sk(sk)->no_check6_tx) { /* UDP csum disabled */
996 skb->ip_summed = CHECKSUM_NONE;
997 goto send;
998 } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
999 udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, len);
1000 goto send;
1001 } else
1002 csum = udp_csum(skb);
1003
1004 /* add protocol-dependent pseudo-header */
1005 uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
1006 len, fl6->flowi6_proto, csum);
1007 if (uh->check == 0)
1008 uh->check = CSUM_MANGLED_0;
1009
1010 send:
1011 err = ip6_send_skb(skb);
1012 if (err) {
1013 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) {
1014 UDP6_INC_STATS(sock_net(sk),
1015 UDP_MIB_SNDBUFERRORS, is_udplite);
1016 err = 0;
1017 }
1018 } else {
1019 UDP6_INC_STATS(sock_net(sk),
1020 UDP_MIB_OUTDATAGRAMS, is_udplite);
1021 }
1022 return err;
1023 }
1024
1025 static int udp_v6_push_pending_frames(struct sock *sk)
1026 {
1027 struct sk_buff *skb;
1028 struct udp_sock *up = udp_sk(sk);
1029 struct flowi6 fl6;
1030 int err = 0;
1031
1032 if (up->pending == AF_INET)
1033 return udp_push_pending_frames(sk);
1034
1035 /* ip6_finish_skb will release the cork, so make a copy of
1036 * fl6 here.
1037 */
1038 fl6 = inet_sk(sk)->cork.fl.u.ip6;
1039
1040 skb = ip6_finish_skb(sk);
1041 if (!skb)
1042 goto out;
1043
1044 err = udp_v6_send_skb(skb, &fl6);
1045
1046 out:
1047 up->len = 0;
1048 up->pending = 0;
1049 return err;
1050 }
1051
1052 int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
1053 {
1054 struct ipv6_txoptions opt_space;
1055 struct udp_sock *up = udp_sk(sk);
1056 struct inet_sock *inet = inet_sk(sk);
1057 struct ipv6_pinfo *np = inet6_sk(sk);
1058 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
1059 struct in6_addr *daddr, *final_p, final;
1060 struct ipv6_txoptions *opt = NULL;
1061 struct ipv6_txoptions *opt_to_free = NULL;
1062 struct ip6_flowlabel *flowlabel = NULL;
1063 struct flowi6 fl6;
1064 struct dst_entry *dst;
1065 struct ipcm6_cookie ipc6;
1066 int addr_len = msg->msg_namelen;
1067 int ulen = len;
1068 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
1069 int err;
1070 int connected = 0;
1071 int is_udplite = IS_UDPLITE(sk);
1072 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
1073 struct sockcm_cookie sockc;
1074
1075 ipc6.hlimit = -1;
1076 ipc6.tclass = -1;
1077 ipc6.dontfrag = -1;
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 ipc6.opt = opt;
1204
1205 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, &ipc6, &sockc);
1206 if (err < 0) {
1207 fl6_sock_release(flowlabel);
1208 return err;
1209 }
1210 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
1211 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1212 if (!flowlabel)
1213 return -EINVAL;
1214 }
1215 if (!(opt->opt_nflen|opt->opt_flen))
1216 opt = NULL;
1217 connected = 0;
1218 }
1219 if (!opt) {
1220 opt = txopt_get(np);
1221 opt_to_free = opt;
1222 }
1223 if (flowlabel)
1224 opt = fl6_merge_options(&opt_space, flowlabel, opt);
1225 opt = ipv6_fixup_options(&opt_space, opt);
1226 ipc6.opt = 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 (ipc6.hlimit < 0)
1257 ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
1258
1259 if (ipc6.tclass < 0)
1260 ipc6.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), &ipc6,
1272 &fl6, (struct rt6_info *)dst,
1273 msg->msg_flags, &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 (ipc6.dontfrag < 0)
1295 ipc6.dontfrag = np->dontfrag;
1296 up->len += ulen;
1297 err = ip6_append_data(sk, getfrag, msg, ulen, sizeof(struct udphdr),
1298 &ipc6, &fl6, (struct rt6_info *)dst,
1299 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, &sockc);
1300 if (err)
1301 udp_v6_flush_pending_frames(sk);
1302 else if (!corkreq)
1303 err = udp_v6_push_pending_frames(sk);
1304 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
1305 up->pending = 0;
1306
1307 if (err > 0)
1308 err = np->recverr ? net_xmit_errno(err) : 0;
1309 release_sock(sk);
1310
1311 release_dst:
1312 if (dst) {
1313 if (connected) {
1314 ip6_dst_store(sk, dst,
1315 ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ?
1316 &sk->sk_v6_daddr : NULL,
1317 #ifdef CONFIG_IPV6_SUBTREES
1318 ipv6_addr_equal(&fl6.saddr, &np->saddr) ?
1319 &np->saddr :
1320 #endif
1321 NULL);
1322 } else {
1323 dst_release(dst);
1324 }
1325 dst = NULL;
1326 }
1327
1328 out:
1329 dst_release(dst);
1330 fl6_sock_release(flowlabel);
1331 txopt_put(opt_to_free);
1332 if (!err)
1333 return len;
1334 /*
1335 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
1336 * ENOBUFS might not be good (it's not tunable per se), but otherwise
1337 * we don't have a good statistic (IpOutDiscards but it can be too many
1338 * things). We could add another new stat but at least for now that
1339 * seems like overkill.
1340 */
1341 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
1342 UDP6_INC_STATS(sock_net(sk),
1343 UDP_MIB_SNDBUFERRORS, is_udplite);
1344 }
1345 return err;
1346
1347 do_confirm:
1348 dst_confirm(dst);
1349 if (!(msg->msg_flags&MSG_PROBE) || len)
1350 goto back_from_confirm;
1351 err = 0;
1352 goto out;
1353 }
1354
1355 void udpv6_destroy_sock(struct sock *sk)
1356 {
1357 struct udp_sock *up = udp_sk(sk);
1358 lock_sock(sk);
1359 udp_v6_flush_pending_frames(sk);
1360 release_sock(sk);
1361
1362 if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
1363 void (*encap_destroy)(struct sock *sk);
1364 encap_destroy = ACCESS_ONCE(up->encap_destroy);
1365 if (encap_destroy)
1366 encap_destroy(sk);
1367 }
1368
1369 inet6_destroy_sock(sk);
1370 }
1371
1372 /*
1373 * Socket option code for UDP
1374 */
1375 int udpv6_setsockopt(struct sock *sk, int level, int optname,
1376 char __user *optval, unsigned int optlen)
1377 {
1378 if (level == SOL_UDP || level == SOL_UDPLITE)
1379 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1380 udp_v6_push_pending_frames);
1381 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1382 }
1383
1384 #ifdef CONFIG_COMPAT
1385 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
1386 char __user *optval, unsigned int optlen)
1387 {
1388 if (level == SOL_UDP || level == SOL_UDPLITE)
1389 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1390 udp_v6_push_pending_frames);
1391 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
1392 }
1393 #endif
1394
1395 int udpv6_getsockopt(struct sock *sk, int level, int optname,
1396 char __user *optval, int __user *optlen)
1397 {
1398 if (level == SOL_UDP || level == SOL_UDPLITE)
1399 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1400 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1401 }
1402
1403 #ifdef CONFIG_COMPAT
1404 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
1405 char __user *optval, int __user *optlen)
1406 {
1407 if (level == SOL_UDP || level == SOL_UDPLITE)
1408 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1409 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
1410 }
1411 #endif
1412
1413 static const struct inet6_protocol udpv6_protocol = {
1414 .handler = udpv6_rcv,
1415 .err_handler = udpv6_err,
1416 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1417 };
1418
1419 /* ------------------------------------------------------------------------ */
1420 #ifdef CONFIG_PROC_FS
1421 int udp6_seq_show(struct seq_file *seq, void *v)
1422 {
1423 if (v == SEQ_START_TOKEN) {
1424 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
1425 } else {
1426 int bucket = ((struct udp_iter_state *)seq->private)->bucket;
1427 struct inet_sock *inet = inet_sk(v);
1428 __u16 srcp = ntohs(inet->inet_sport);
1429 __u16 destp = ntohs(inet->inet_dport);
1430 ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket);
1431 }
1432 return 0;
1433 }
1434
1435 static const struct file_operations udp6_afinfo_seq_fops = {
1436 .owner = THIS_MODULE,
1437 .open = udp_seq_open,
1438 .read = seq_read,
1439 .llseek = seq_lseek,
1440 .release = seq_release_net
1441 };
1442
1443 static struct udp_seq_afinfo udp6_seq_afinfo = {
1444 .name = "udp6",
1445 .family = AF_INET6,
1446 .udp_table = &udp_table,
1447 .seq_fops = &udp6_afinfo_seq_fops,
1448 .seq_ops = {
1449 .show = udp6_seq_show,
1450 },
1451 };
1452
1453 int __net_init udp6_proc_init(struct net *net)
1454 {
1455 return udp_proc_register(net, &udp6_seq_afinfo);
1456 }
1457
1458 void udp6_proc_exit(struct net *net)
1459 {
1460 udp_proc_unregister(net, &udp6_seq_afinfo);
1461 }
1462 #endif /* CONFIG_PROC_FS */
1463
1464 void udp_v6_clear_sk(struct sock *sk, int size)
1465 {
1466 struct inet_sock *inet = inet_sk(sk);
1467
1468 /* we do not want to clear pinet6 field, because of RCU lookups */
1469 sk_prot_clear_portaddr_nulls(sk, offsetof(struct inet_sock, pinet6));
1470
1471 size -= offsetof(struct inet_sock, pinet6) + sizeof(inet->pinet6);
1472 memset(&inet->pinet6 + 1, 0, size);
1473 }
1474
1475 /* ------------------------------------------------------------------------ */
1476
1477 struct proto udpv6_prot = {
1478 .name = "UDPv6",
1479 .owner = THIS_MODULE,
1480 .close = udp_lib_close,
1481 .connect = ip6_datagram_connect,
1482 .disconnect = udp_disconnect,
1483 .ioctl = udp_ioctl,
1484 .destroy = udpv6_destroy_sock,
1485 .setsockopt = udpv6_setsockopt,
1486 .getsockopt = udpv6_getsockopt,
1487 .sendmsg = udpv6_sendmsg,
1488 .recvmsg = udpv6_recvmsg,
1489 .backlog_rcv = __udpv6_queue_rcv_skb,
1490 .release_cb = ip6_datagram_release_cb,
1491 .hash = udp_lib_hash,
1492 .unhash = udp_lib_unhash,
1493 .rehash = udp_v6_rehash,
1494 .get_port = udp_v6_get_port,
1495 .memory_allocated = &udp_memory_allocated,
1496 .sysctl_mem = sysctl_udp_mem,
1497 .sysctl_wmem = &sysctl_udp_wmem_min,
1498 .sysctl_rmem = &sysctl_udp_rmem_min,
1499 .obj_size = sizeof(struct udp6_sock),
1500 .slab_flags = SLAB_DESTROY_BY_RCU,
1501 .h.udp_table = &udp_table,
1502 #ifdef CONFIG_COMPAT
1503 .compat_setsockopt = compat_udpv6_setsockopt,
1504 .compat_getsockopt = compat_udpv6_getsockopt,
1505 #endif
1506 .clear_sk = udp_v6_clear_sk,
1507 };
1508
1509 static struct inet_protosw udpv6_protosw = {
1510 .type = SOCK_DGRAM,
1511 .protocol = IPPROTO_UDP,
1512 .prot = &udpv6_prot,
1513 .ops = &inet6_dgram_ops,
1514 .flags = INET_PROTOSW_PERMANENT,
1515 };
1516
1517 int __init udpv6_init(void)
1518 {
1519 int ret;
1520
1521 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
1522 if (ret)
1523 goto out;
1524
1525 ret = inet6_register_protosw(&udpv6_protosw);
1526 if (ret)
1527 goto out_udpv6_protocol;
1528 out:
1529 return ret;
1530
1531 out_udpv6_protocol:
1532 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1533 goto out;
1534 }
1535
1536 void udpv6_exit(void)
1537 {
1538 inet6_unregister_protosw(&udpv6_protosw);
1539 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1540 }
Linux with added FPC-III support