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Merge tag 'wireless-drivers-for-davem-2015-01-09' of git://git.kernel.org/pub/scm...
[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/ndisc.h>
41 #include <net/protocol.h>
42 #include <net/transp_v6.h>
43 #include <net/ip6_route.h>
44 #include <net/raw.h>
45 #include <net/tcp_states.h>
46 #include <net/ip6_checksum.h>
47 #include <net/xfrm.h>
48 #include <net/inet6_hashtables.h>
49 #include <net/busy_poll.h>
50
51 #include <linux/proc_fs.h>
52 #include <linux/seq_file.h>
53 #include <trace/events/skb.h>
54 #include "udp_impl.h"
55
56 static unsigned int udp6_ehashfn(struct net *net,
57 const struct in6_addr *laddr,
58 const u16 lport,
59 const struct in6_addr *faddr,
60 const __be16 fport)
61 {
62 static u32 udp6_ehash_secret __read_mostly;
63 static u32 udp_ipv6_hash_secret __read_mostly;
64
65 u32 lhash, fhash;
66
67 net_get_random_once(&udp6_ehash_secret,
68 sizeof(udp6_ehash_secret));
69 net_get_random_once(&udp_ipv6_hash_secret,
70 sizeof(udp_ipv6_hash_secret));
71
72 lhash = (__force u32)laddr->s6_addr32[3];
73 fhash = __ipv6_addr_jhash(faddr, udp_ipv6_hash_secret);
74
75 return __inet6_ehashfn(lhash, lport, fhash, fport,
76 udp_ipv6_hash_secret + net_hash_mix(net));
77 }
78
79 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
80 {
81 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
82 int sk2_ipv6only = inet_v6_ipv6only(sk2);
83 int addr_type = ipv6_addr_type(&sk->sk_v6_rcv_saddr);
84 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
85
86 /* if both are mapped, treat as IPv4 */
87 if (addr_type == IPV6_ADDR_MAPPED && addr_type2 == IPV6_ADDR_MAPPED)
88 return (!sk2_ipv6only &&
89 (!sk->sk_rcv_saddr || !sk2->sk_rcv_saddr ||
90 sk->sk_rcv_saddr == sk2->sk_rcv_saddr));
91
92 if (addr_type2 == IPV6_ADDR_ANY &&
93 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
94 return 1;
95
96 if (addr_type == IPV6_ADDR_ANY &&
97 !(ipv6_only_sock(sk) && addr_type2 == IPV6_ADDR_MAPPED))
98 return 1;
99
100 if (sk2_rcv_saddr6 &&
101 ipv6_addr_equal(&sk->sk_v6_rcv_saddr, sk2_rcv_saddr6))
102 return 1;
103
104 return 0;
105 }
106
107 static unsigned int udp6_portaddr_hash(struct net *net,
108 const struct in6_addr *addr6,
109 unsigned int port)
110 {
111 unsigned int hash, mix = net_hash_mix(net);
112
113 if (ipv6_addr_any(addr6))
114 hash = jhash_1word(0, mix);
115 else if (ipv6_addr_v4mapped(addr6))
116 hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix);
117 else
118 hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix);
119
120 return hash ^ port;
121 }
122
123
124 int udp_v6_get_port(struct sock *sk, unsigned short snum)
125 {
126 unsigned int hash2_nulladdr =
127 udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum);
128 unsigned int hash2_partial =
129 udp6_portaddr_hash(sock_net(sk), &sk->sk_v6_rcv_saddr, 0);
130
131 /* precompute partial secondary hash */
132 udp_sk(sk)->udp_portaddr_hash = hash2_partial;
133 return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal, hash2_nulladdr);
134 }
135
136 static void udp_v6_rehash(struct sock *sk)
137 {
138 u16 new_hash = udp6_portaddr_hash(sock_net(sk),
139 &sk->sk_v6_rcv_saddr,
140 inet_sk(sk)->inet_num);
141
142 udp_lib_rehash(sk, new_hash);
143 }
144
145 static inline int compute_score(struct sock *sk, struct net *net,
146 unsigned short hnum,
147 const struct in6_addr *saddr, __be16 sport,
148 const struct in6_addr *daddr, __be16 dport,
149 int dif)
150 {
151 int score;
152 struct inet_sock *inet;
153
154 if (!net_eq(sock_net(sk), net) ||
155 udp_sk(sk)->udp_port_hash != hnum ||
156 sk->sk_family != PF_INET6)
157 return -1;
158
159 score = 0;
160 inet = inet_sk(sk);
161
162 if (inet->inet_dport) {
163 if (inet->inet_dport != sport)
164 return -1;
165 score++;
166 }
167
168 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
169 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr))
170 return -1;
171 score++;
172 }
173
174 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
175 if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr))
176 return -1;
177 score++;
178 }
179
180 if (sk->sk_bound_dev_if) {
181 if (sk->sk_bound_dev_if != dif)
182 return -1;
183 score++;
184 }
185
186 return score;
187 }
188
189 #define SCORE2_MAX (1 + 1 + 1)
190 static inline int compute_score2(struct sock *sk, struct net *net,
191 const struct in6_addr *saddr, __be16 sport,
192 const struct in6_addr *daddr,
193 unsigned short hnum, int dif)
194 {
195 int score;
196 struct inet_sock *inet;
197
198 if (!net_eq(sock_net(sk), net) ||
199 udp_sk(sk)->udp_port_hash != hnum ||
200 sk->sk_family != PF_INET6)
201 return -1;
202
203 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr))
204 return -1;
205
206 score = 0;
207 inet = inet_sk(sk);
208
209 if (inet->inet_dport) {
210 if (inet->inet_dport != sport)
211 return -1;
212 score++;
213 }
214
215 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
216 if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr))
217 return -1;
218 score++;
219 }
220
221 if (sk->sk_bound_dev_if) {
222 if (sk->sk_bound_dev_if != dif)
223 return -1;
224 score++;
225 }
226
227 return score;
228 }
229
230 /* called with read_rcu_lock() */
231 static struct sock *udp6_lib_lookup2(struct net *net,
232 const struct in6_addr *saddr, __be16 sport,
233 const struct in6_addr *daddr, unsigned int hnum, int dif,
234 struct udp_hslot *hslot2, unsigned int slot2)
235 {
236 struct sock *sk, *result;
237 struct hlist_nulls_node *node;
238 int score, badness, matches = 0, reuseport = 0;
239 u32 hash = 0;
240
241 begin:
242 result = NULL;
243 badness = -1;
244 udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) {
245 score = compute_score2(sk, net, saddr, sport,
246 daddr, hnum, dif);
247 if (score > badness) {
248 result = sk;
249 badness = score;
250 reuseport = sk->sk_reuseport;
251 if (reuseport) {
252 hash = udp6_ehashfn(net, daddr, hnum,
253 saddr, sport);
254 matches = 1;
255 } else if (score == SCORE2_MAX)
256 goto exact_match;
257 } else if (score == badness && reuseport) {
258 matches++;
259 if (reciprocal_scale(hash, matches) == 0)
260 result = sk;
261 hash = next_pseudo_random32(hash);
262 }
263 }
264 /*
265 * if the nulls value we got at the end of this lookup is
266 * not the expected one, we must restart lookup.
267 * We probably met an item that was moved to another chain.
268 */
269 if (get_nulls_value(node) != slot2)
270 goto begin;
271
272 if (result) {
273 exact_match:
274 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
275 result = NULL;
276 else if (unlikely(compute_score2(result, net, saddr, sport,
277 daddr, hnum, dif) < badness)) {
278 sock_put(result);
279 goto begin;
280 }
281 }
282 return result;
283 }
284
285 struct sock *__udp6_lib_lookup(struct net *net,
286 const struct in6_addr *saddr, __be16 sport,
287 const struct in6_addr *daddr, __be16 dport,
288 int dif, struct udp_table *udptable)
289 {
290 struct sock *sk, *result;
291 struct hlist_nulls_node *node;
292 unsigned short hnum = ntohs(dport);
293 unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask);
294 struct udp_hslot *hslot2, *hslot = &udptable->hash[slot];
295 int score, badness, matches = 0, reuseport = 0;
296 u32 hash = 0;
297
298 rcu_read_lock();
299 if (hslot->count > 10) {
300 hash2 = udp6_portaddr_hash(net, daddr, hnum);
301 slot2 = hash2 & udptable->mask;
302 hslot2 = &udptable->hash2[slot2];
303 if (hslot->count < hslot2->count)
304 goto begin;
305
306 result = udp6_lib_lookup2(net, saddr, sport,
307 daddr, hnum, dif,
308 hslot2, slot2);
309 if (!result) {
310 hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum);
311 slot2 = hash2 & udptable->mask;
312 hslot2 = &udptable->hash2[slot2];
313 if (hslot->count < hslot2->count)
314 goto begin;
315
316 result = udp6_lib_lookup2(net, saddr, sport,
317 &in6addr_any, hnum, dif,
318 hslot2, slot2);
319 }
320 rcu_read_unlock();
321 return result;
322 }
323 begin:
324 result = NULL;
325 badness = -1;
326 sk_nulls_for_each_rcu(sk, node, &hslot->head) {
327 score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif);
328 if (score > badness) {
329 result = sk;
330 badness = score;
331 reuseport = sk->sk_reuseport;
332 if (reuseport) {
333 hash = udp6_ehashfn(net, daddr, hnum,
334 saddr, sport);
335 matches = 1;
336 }
337 } else if (score == badness && reuseport) {
338 matches++;
339 if (reciprocal_scale(hash, matches) == 0)
340 result = sk;
341 hash = next_pseudo_random32(hash);
342 }
343 }
344 /*
345 * if the nulls value we got at the end of this lookup is
346 * not the expected one, we must restart lookup.
347 * We probably met an item that was moved to another chain.
348 */
349 if (get_nulls_value(node) != slot)
350 goto begin;
351
352 if (result) {
353 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
354 result = NULL;
355 else if (unlikely(compute_score(result, net, hnum, saddr, sport,
356 daddr, dport, dif) < badness)) {
357 sock_put(result);
358 goto begin;
359 }
360 }
361 rcu_read_unlock();
362 return result;
363 }
364 EXPORT_SYMBOL_GPL(__udp6_lib_lookup);
365
366 static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb,
367 __be16 sport, __be16 dport,
368 struct udp_table *udptable)
369 {
370 struct sock *sk;
371 const struct ipv6hdr *iph = ipv6_hdr(skb);
372
373 sk = skb_steal_sock(skb);
374 if (unlikely(sk))
375 return sk;
376 return __udp6_lib_lookup(dev_net(skb_dst(skb)->dev), &iph->saddr, sport,
377 &iph->daddr, dport, inet6_iif(skb),
378 udptable);
379 }
380
381 struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport,
382 const struct in6_addr *daddr, __be16 dport, int dif)
383 {
384 return __udp6_lib_lookup(net, saddr, sport, daddr, dport, dif, &udp_table);
385 }
386 EXPORT_SYMBOL_GPL(udp6_lib_lookup);
387
388
389 /*
390 * This should be easy, if there is something there we
391 * return it, otherwise we block.
392 */
393
394 int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
395 struct msghdr *msg, size_t len,
396 int noblock, int flags, int *addr_len)
397 {
398 struct ipv6_pinfo *np = inet6_sk(sk);
399 struct inet_sock *inet = inet_sk(sk);
400 struct sk_buff *skb;
401 unsigned int ulen, copied;
402 int peeked, off = 0;
403 int err;
404 int is_udplite = IS_UDPLITE(sk);
405 int is_udp4;
406 bool slow;
407
408 if (flags & MSG_ERRQUEUE)
409 return ipv6_recv_error(sk, msg, len, addr_len);
410
411 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
412 return ipv6_recv_rxpmtu(sk, msg, len, addr_len);
413
414 try_again:
415 skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),
416 &peeked, &off, &err);
417 if (!skb)
418 goto out;
419
420 ulen = skb->len - sizeof(struct udphdr);
421 copied = len;
422 if (copied > ulen)
423 copied = ulen;
424 else if (copied < ulen)
425 msg->msg_flags |= MSG_TRUNC;
426
427 is_udp4 = (skb->protocol == htons(ETH_P_IP));
428
429 /*
430 * If checksum is needed at all, try to do it while copying the
431 * data. If the data is truncated, or if we only want a partial
432 * coverage checksum (UDP-Lite), do it before the copy.
433 */
434
435 if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) {
436 if (udp_lib_checksum_complete(skb))
437 goto csum_copy_err;
438 }
439
440 if (skb_csum_unnecessary(skb))
441 err = skb_copy_datagram_msg(skb, sizeof(struct udphdr),
442 msg, copied);
443 else {
444 err = skb_copy_and_csum_datagram_msg(skb, sizeof(struct udphdr), msg);
445 if (err == -EINVAL)
446 goto csum_copy_err;
447 }
448 if (unlikely(err)) {
449 trace_kfree_skb(skb, udpv6_recvmsg);
450 if (!peeked) {
451 atomic_inc(&sk->sk_drops);
452 if (is_udp4)
453 UDP_INC_STATS_USER(sock_net(sk),
454 UDP_MIB_INERRORS,
455 is_udplite);
456 else
457 UDP6_INC_STATS_USER(sock_net(sk),
458 UDP_MIB_INERRORS,
459 is_udplite);
460 }
461 goto out_free;
462 }
463 if (!peeked) {
464 if (is_udp4)
465 UDP_INC_STATS_USER(sock_net(sk),
466 UDP_MIB_INDATAGRAMS, is_udplite);
467 else
468 UDP6_INC_STATS_USER(sock_net(sk),
469 UDP_MIB_INDATAGRAMS, is_udplite);
470 }
471
472 sock_recv_ts_and_drops(msg, sk, skb);
473
474 /* Copy the address. */
475 if (msg->msg_name) {
476 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
477 sin6->sin6_family = AF_INET6;
478 sin6->sin6_port = udp_hdr(skb)->source;
479 sin6->sin6_flowinfo = 0;
480
481 if (is_udp4) {
482 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
483 &sin6->sin6_addr);
484 sin6->sin6_scope_id = 0;
485 } else {
486 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
487 sin6->sin6_scope_id =
488 ipv6_iface_scope_id(&sin6->sin6_addr,
489 inet6_iif(skb));
490 }
491 *addr_len = sizeof(*sin6);
492 }
493
494 if (np->rxopt.all)
495 ip6_datagram_recv_common_ctl(sk, msg, skb);
496
497 if (is_udp4) {
498 if (inet->cmsg_flags)
499 ip_cmsg_recv(msg, skb);
500 } else {
501 if (np->rxopt.all)
502 ip6_datagram_recv_specific_ctl(sk, msg, skb);
503 }
504
505 err = copied;
506 if (flags & MSG_TRUNC)
507 err = ulen;
508
509 out_free:
510 skb_free_datagram_locked(sk, skb);
511 out:
512 return err;
513
514 csum_copy_err:
515 slow = lock_sock_fast(sk);
516 if (!skb_kill_datagram(sk, skb, flags)) {
517 if (is_udp4) {
518 UDP_INC_STATS_USER(sock_net(sk),
519 UDP_MIB_CSUMERRORS, is_udplite);
520 UDP_INC_STATS_USER(sock_net(sk),
521 UDP_MIB_INERRORS, is_udplite);
522 } else {
523 UDP6_INC_STATS_USER(sock_net(sk),
524 UDP_MIB_CSUMERRORS, is_udplite);
525 UDP6_INC_STATS_USER(sock_net(sk),
526 UDP_MIB_INERRORS, is_udplite);
527 }
528 }
529 unlock_sock_fast(sk, slow);
530
531 if (noblock)
532 return -EAGAIN;
533
534 /* starting over for a new packet */
535 msg->msg_flags &= ~MSG_TRUNC;
536 goto try_again;
537 }
538
539 void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
540 u8 type, u8 code, int offset, __be32 info,
541 struct udp_table *udptable)
542 {
543 struct ipv6_pinfo *np;
544 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
545 const struct in6_addr *saddr = &hdr->saddr;
546 const struct in6_addr *daddr = &hdr->daddr;
547 struct udphdr *uh = (struct udphdr *)(skb->data+offset);
548 struct sock *sk;
549 int err;
550 struct net *net = dev_net(skb->dev);
551
552 sk = __udp6_lib_lookup(net, daddr, uh->dest,
553 saddr, uh->source, inet6_iif(skb), udptable);
554 if (sk == NULL) {
555 ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev),
556 ICMP6_MIB_INERRORS);
557 return;
558 }
559
560 if (type == ICMPV6_PKT_TOOBIG) {
561 if (!ip6_sk_accept_pmtu(sk))
562 goto out;
563 ip6_sk_update_pmtu(skb, sk, info);
564 }
565 if (type == NDISC_REDIRECT) {
566 ip6_sk_redirect(skb, sk);
567 goto out;
568 }
569
570 np = inet6_sk(sk);
571
572 if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
573 goto out;
574
575 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
576 goto out;
577
578 if (np->recverr)
579 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
580
581 sk->sk_err = err;
582 sk->sk_error_report(sk);
583 out:
584 sock_put(sk);
585 }
586
587 static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
588 {
589 int rc;
590
591 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
592 sock_rps_save_rxhash(sk, skb);
593 sk_mark_napi_id(sk, skb);
594 sk_incoming_cpu_update(sk);
595 }
596
597 rc = sock_queue_rcv_skb(sk, skb);
598 if (rc < 0) {
599 int is_udplite = IS_UDPLITE(sk);
600
601 /* Note that an ENOMEM error is charged twice */
602 if (rc == -ENOMEM)
603 UDP6_INC_STATS_BH(sock_net(sk),
604 UDP_MIB_RCVBUFERRORS, is_udplite);
605 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
606 kfree_skb(skb);
607 return -1;
608 }
609 return 0;
610 }
611
612 static __inline__ void udpv6_err(struct sk_buff *skb,
613 struct inet6_skb_parm *opt, u8 type,
614 u8 code, int offset, __be32 info)
615 {
616 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table);
617 }
618
619 static struct static_key udpv6_encap_needed __read_mostly;
620 void udpv6_encap_enable(void)
621 {
622 if (!static_key_enabled(&udpv6_encap_needed))
623 static_key_slow_inc(&udpv6_encap_needed);
624 }
625 EXPORT_SYMBOL(udpv6_encap_enable);
626
627 int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
628 {
629 struct udp_sock *up = udp_sk(sk);
630 int rc;
631 int is_udplite = IS_UDPLITE(sk);
632
633 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
634 goto drop;
635
636 if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
637 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
638
639 /*
640 * This is an encapsulation socket so pass the skb to
641 * the socket's udp_encap_rcv() hook. Otherwise, just
642 * fall through and pass this up the UDP socket.
643 * up->encap_rcv() returns the following value:
644 * =0 if skb was successfully passed to the encap
645 * handler or was discarded by it.
646 * >0 if skb should be passed on to UDP.
647 * <0 if skb should be resubmitted as proto -N
648 */
649
650 /* if we're overly short, let UDP handle it */
651 encap_rcv = ACCESS_ONCE(up->encap_rcv);
652 if (skb->len > sizeof(struct udphdr) && encap_rcv != NULL) {
653 int ret;
654
655 /* Verify checksum before giving to encap */
656 if (udp_lib_checksum_complete(skb))
657 goto csum_error;
658
659 ret = encap_rcv(sk, skb);
660 if (ret <= 0) {
661 UDP_INC_STATS_BH(sock_net(sk),
662 UDP_MIB_INDATAGRAMS,
663 is_udplite);
664 return -ret;
665 }
666 }
667
668 /* FALLTHROUGH -- it's a UDP Packet */
669 }
670
671 /*
672 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
673 */
674 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
675
676 if (up->pcrlen == 0) { /* full coverage was set */
677 net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n",
678 UDP_SKB_CB(skb)->cscov, skb->len);
679 goto drop;
680 }
681 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
682 net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n",
683 UDP_SKB_CB(skb)->cscov, up->pcrlen);
684 goto drop;
685 }
686 }
687
688 if (rcu_access_pointer(sk->sk_filter)) {
689 if (udp_lib_checksum_complete(skb))
690 goto csum_error;
691 }
692
693 if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
694 UDP6_INC_STATS_BH(sock_net(sk),
695 UDP_MIB_RCVBUFERRORS, is_udplite);
696 goto drop;
697 }
698
699 skb_dst_drop(skb);
700
701 bh_lock_sock(sk);
702 rc = 0;
703 if (!sock_owned_by_user(sk))
704 rc = __udpv6_queue_rcv_skb(sk, skb);
705 else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
706 bh_unlock_sock(sk);
707 goto drop;
708 }
709 bh_unlock_sock(sk);
710
711 return rc;
712
713 csum_error:
714 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite);
715 drop:
716 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
717 atomic_inc(&sk->sk_drops);
718 kfree_skb(skb);
719 return -1;
720 }
721
722 static bool __udp_v6_is_mcast_sock(struct net *net, struct sock *sk,
723 __be16 loc_port, const struct in6_addr *loc_addr,
724 __be16 rmt_port, const struct in6_addr *rmt_addr,
725 int dif, unsigned short hnum)
726 {
727 struct inet_sock *inet = inet_sk(sk);
728
729 if (!net_eq(sock_net(sk), net))
730 return false;
731
732 if (udp_sk(sk)->udp_port_hash != hnum ||
733 sk->sk_family != PF_INET6 ||
734 (inet->inet_dport && inet->inet_dport != rmt_port) ||
735 (!ipv6_addr_any(&sk->sk_v6_daddr) &&
736 !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) ||
737 (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif))
738 return false;
739 if (!inet6_mc_check(sk, loc_addr, rmt_addr))
740 return false;
741 return true;
742 }
743
744 static void flush_stack(struct sock **stack, unsigned int count,
745 struct sk_buff *skb, unsigned int final)
746 {
747 struct sk_buff *skb1 = NULL;
748 struct sock *sk;
749 unsigned int i;
750
751 for (i = 0; i < count; i++) {
752 sk = stack[i];
753 if (likely(skb1 == NULL))
754 skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC);
755 if (!skb1) {
756 atomic_inc(&sk->sk_drops);
757 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS,
758 IS_UDPLITE(sk));
759 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS,
760 IS_UDPLITE(sk));
761 }
762
763 if (skb1 && udpv6_queue_rcv_skb(sk, skb1) <= 0)
764 skb1 = NULL;
765 sock_put(sk);
766 }
767 if (unlikely(skb1))
768 kfree_skb(skb1);
769 }
770
771 static void udp6_csum_zero_error(struct sk_buff *skb)
772 {
773 /* RFC 2460 section 8.1 says that we SHOULD log
774 * this error. Well, it is reasonable.
775 */
776 net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n",
777 &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source),
778 &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest));
779 }
780
781 /*
782 * Note: called only from the BH handler context,
783 * so we don't need to lock the hashes.
784 */
785 static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
786 const struct in6_addr *saddr, const struct in6_addr *daddr,
787 struct udp_table *udptable, int proto)
788 {
789 struct sock *sk, *stack[256 / sizeof(struct sock *)];
790 const struct udphdr *uh = udp_hdr(skb);
791 struct hlist_nulls_node *node;
792 unsigned short hnum = ntohs(uh->dest);
793 struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum);
794 int dif = inet6_iif(skb);
795 unsigned int count = 0, offset = offsetof(typeof(*sk), sk_nulls_node);
796 unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10);
797 bool inner_flushed = false;
798
799 if (use_hash2) {
800 hash2_any = udp6_portaddr_hash(net, &in6addr_any, hnum) &
801 udp_table.mask;
802 hash2 = udp6_portaddr_hash(net, daddr, hnum) & udp_table.mask;
803 start_lookup:
804 hslot = &udp_table.hash2[hash2];
805 offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node);
806 }
807
808 spin_lock(&hslot->lock);
809 sk_nulls_for_each_entry_offset(sk, node, &hslot->head, offset) {
810 if (__udp_v6_is_mcast_sock(net, sk,
811 uh->dest, daddr,
812 uh->source, saddr,
813 dif, hnum) &&
814 /* If zero checksum and no_check is not on for
815 * the socket then skip it.
816 */
817 (uh->check || udp_sk(sk)->no_check6_rx)) {
818 if (unlikely(count == ARRAY_SIZE(stack))) {
819 flush_stack(stack, count, skb, ~0);
820 inner_flushed = true;
821 count = 0;
822 }
823 stack[count++] = sk;
824 sock_hold(sk);
825 }
826 }
827
828 spin_unlock(&hslot->lock);
829
830 /* Also lookup *:port if we are using hash2 and haven't done so yet. */
831 if (use_hash2 && hash2 != hash2_any) {
832 hash2 = hash2_any;
833 goto start_lookup;
834 }
835
836 if (count) {
837 flush_stack(stack, count, skb, count - 1);
838 } else {
839 if (!inner_flushed)
840 UDP_INC_STATS_BH(net, UDP_MIB_IGNOREDMULTI,
841 proto == IPPROTO_UDPLITE);
842 consume_skb(skb);
843 }
844 return 0;
845 }
846
847 int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
848 int proto)
849 {
850 struct net *net = dev_net(skb->dev);
851 struct sock *sk;
852 struct udphdr *uh;
853 const struct in6_addr *saddr, *daddr;
854 u32 ulen = 0;
855
856 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
857 goto discard;
858
859 saddr = &ipv6_hdr(skb)->saddr;
860 daddr = &ipv6_hdr(skb)->daddr;
861 uh = udp_hdr(skb);
862
863 ulen = ntohs(uh->len);
864 if (ulen > skb->len)
865 goto short_packet;
866
867 if (proto == IPPROTO_UDP) {
868 /* UDP validates ulen. */
869
870 /* Check for jumbo payload */
871 if (ulen == 0)
872 ulen = skb->len;
873
874 if (ulen < sizeof(*uh))
875 goto short_packet;
876
877 if (ulen < skb->len) {
878 if (pskb_trim_rcsum(skb, ulen))
879 goto short_packet;
880 saddr = &ipv6_hdr(skb)->saddr;
881 daddr = &ipv6_hdr(skb)->daddr;
882 uh = udp_hdr(skb);
883 }
884 }
885
886 if (udp6_csum_init(skb, uh, proto))
887 goto csum_error;
888
889 /*
890 * Multicast receive code
891 */
892 if (ipv6_addr_is_multicast(daddr))
893 return __udp6_lib_mcast_deliver(net, skb,
894 saddr, daddr, udptable, proto);
895
896 /* Unicast */
897
898 /*
899 * check socket cache ... must talk to Alan about his plans
900 * for sock caches... i'll skip this for now.
901 */
902 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
903 if (sk != NULL) {
904 int ret;
905
906 if (!uh->check && !udp_sk(sk)->no_check6_rx) {
907 sock_put(sk);
908 udp6_csum_zero_error(skb);
909 goto csum_error;
910 }
911
912 if (udp_sk(sk)->convert_csum && uh->check && !IS_UDPLITE(sk))
913 skb_checksum_try_convert(skb, IPPROTO_UDP, uh->check,
914 ip6_compute_pseudo);
915
916 ret = udpv6_queue_rcv_skb(sk, skb);
917 sock_put(sk);
918
919 /* a return value > 0 means to resubmit the input, but
920 * it wants the return to be -protocol, or 0
921 */
922 if (ret > 0)
923 return -ret;
924
925 return 0;
926 }
927
928 if (!uh->check) {
929 udp6_csum_zero_error(skb);
930 goto csum_error;
931 }
932
933 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
934 goto discard;
935
936 if (udp_lib_checksum_complete(skb))
937 goto csum_error;
938
939 UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
940 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
941
942 kfree_skb(skb);
943 return 0;
944
945 short_packet:
946 net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n",
947 proto == IPPROTO_UDPLITE ? "-Lite" : "",
948 saddr, ntohs(uh->source),
949 ulen, skb->len,
950 daddr, ntohs(uh->dest));
951 goto discard;
952 csum_error:
953 UDP6_INC_STATS_BH(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE);
954 discard:
955 UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
956 kfree_skb(skb);
957 return 0;
958 }
959
960 static __inline__ int udpv6_rcv(struct sk_buff *skb)
961 {
962 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP);
963 }
964
965 /*
966 * Throw away all pending data and cancel the corking. Socket is locked.
967 */
968 static void udp_v6_flush_pending_frames(struct sock *sk)
969 {
970 struct udp_sock *up = udp_sk(sk);
971
972 if (up->pending == AF_INET)
973 udp_flush_pending_frames(sk);
974 else if (up->pending) {
975 up->len = 0;
976 up->pending = 0;
977 ip6_flush_pending_frames(sk);
978 }
979 }
980
981 /**
982 * udp6_hwcsum_outgoing - handle outgoing HW checksumming
983 * @sk: socket we are sending on
984 * @skb: sk_buff containing the filled-in UDP header
985 * (checksum field must be zeroed out)
986 */
987 static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
988 const struct in6_addr *saddr,
989 const struct in6_addr *daddr, int len)
990 {
991 unsigned int offset;
992 struct udphdr *uh = udp_hdr(skb);
993 __wsum csum = 0;
994
995 if (skb_queue_len(&sk->sk_write_queue) == 1) {
996 /* Only one fragment on the socket. */
997 skb->csum_start = skb_transport_header(skb) - skb->head;
998 skb->csum_offset = offsetof(struct udphdr, check);
999 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0);
1000 } else {
1001 /*
1002 * HW-checksum won't work as there are two or more
1003 * fragments on the socket so that all csums of sk_buffs
1004 * should be together
1005 */
1006 offset = skb_transport_offset(skb);
1007 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
1008
1009 skb->ip_summed = CHECKSUM_NONE;
1010
1011 skb_queue_walk(&sk->sk_write_queue, skb) {
1012 csum = csum_add(csum, skb->csum);
1013 }
1014
1015 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP,
1016 csum);
1017 if (uh->check == 0)
1018 uh->check = CSUM_MANGLED_0;
1019 }
1020 }
1021
1022 /*
1023 * Sending
1024 */
1025
1026 static int udp_v6_push_pending_frames(struct sock *sk)
1027 {
1028 struct sk_buff *skb;
1029 struct udphdr *uh;
1030 struct udp_sock *up = udp_sk(sk);
1031 struct inet_sock *inet = inet_sk(sk);
1032 struct flowi6 *fl6;
1033 int err = 0;
1034 int is_udplite = IS_UDPLITE(sk);
1035 __wsum csum = 0;
1036
1037 if (up->pending == AF_INET)
1038 return udp_push_pending_frames(sk);
1039
1040 fl6 = &inet->cork.fl.u.ip6;
1041
1042 /* Grab the skbuff where UDP header space exists. */
1043 skb = skb_peek(&sk->sk_write_queue);
1044 if (skb == NULL)
1045 goto out;
1046
1047 /*
1048 * Create a UDP header
1049 */
1050 uh = udp_hdr(skb);
1051 uh->source = fl6->fl6_sport;
1052 uh->dest = fl6->fl6_dport;
1053 uh->len = htons(up->len);
1054 uh->check = 0;
1055
1056 if (is_udplite)
1057 csum = udplite_csum_outgoing(sk, skb);
1058 else if (up->no_check6_tx) { /* UDP csum disabled */
1059 skb->ip_summed = CHECKSUM_NONE;
1060 goto send;
1061 } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
1062 udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr,
1063 up->len);
1064 goto send;
1065 } else
1066 csum = udp_csum_outgoing(sk, skb);
1067
1068 /* add protocol-dependent pseudo-header */
1069 uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
1070 up->len, fl6->flowi6_proto, csum);
1071 if (uh->check == 0)
1072 uh->check = CSUM_MANGLED_0;
1073
1074 send:
1075 err = ip6_push_pending_frames(sk);
1076 if (err) {
1077 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) {
1078 UDP6_INC_STATS_USER(sock_net(sk),
1079 UDP_MIB_SNDBUFERRORS, is_udplite);
1080 err = 0;
1081 }
1082 } else
1083 UDP6_INC_STATS_USER(sock_net(sk),
1084 UDP_MIB_OUTDATAGRAMS, is_udplite);
1085 out:
1086 up->len = 0;
1087 up->pending = 0;
1088 return err;
1089 }
1090
1091 int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
1092 struct msghdr *msg, size_t len)
1093 {
1094 struct ipv6_txoptions opt_space;
1095 struct udp_sock *up = udp_sk(sk);
1096 struct inet_sock *inet = inet_sk(sk);
1097 struct ipv6_pinfo *np = inet6_sk(sk);
1098 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
1099 struct in6_addr *daddr, *final_p, final;
1100 struct ipv6_txoptions *opt = NULL;
1101 struct ip6_flowlabel *flowlabel = NULL;
1102 struct flowi6 fl6;
1103 struct dst_entry *dst;
1104 int addr_len = msg->msg_namelen;
1105 int ulen = len;
1106 int hlimit = -1;
1107 int tclass = -1;
1108 int dontfrag = -1;
1109 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
1110 int err;
1111 int connected = 0;
1112 int is_udplite = IS_UDPLITE(sk);
1113 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
1114
1115 /* destination address check */
1116 if (sin6) {
1117 if (addr_len < offsetof(struct sockaddr, sa_data))
1118 return -EINVAL;
1119
1120 switch (sin6->sin6_family) {
1121 case AF_INET6:
1122 if (addr_len < SIN6_LEN_RFC2133)
1123 return -EINVAL;
1124 daddr = &sin6->sin6_addr;
1125 break;
1126 case AF_INET:
1127 goto do_udp_sendmsg;
1128 case AF_UNSPEC:
1129 msg->msg_name = sin6 = NULL;
1130 msg->msg_namelen = addr_len = 0;
1131 daddr = NULL;
1132 break;
1133 default:
1134 return -EINVAL;
1135 }
1136 } else if (!up->pending) {
1137 if (sk->sk_state != TCP_ESTABLISHED)
1138 return -EDESTADDRREQ;
1139 daddr = &sk->sk_v6_daddr;
1140 } else
1141 daddr = NULL;
1142
1143 if (daddr) {
1144 if (ipv6_addr_v4mapped(daddr)) {
1145 struct sockaddr_in sin;
1146 sin.sin_family = AF_INET;
1147 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport;
1148 sin.sin_addr.s_addr = daddr->s6_addr32[3];
1149 msg->msg_name = &sin;
1150 msg->msg_namelen = sizeof(sin);
1151 do_udp_sendmsg:
1152 if (__ipv6_only_sock(sk))
1153 return -ENETUNREACH;
1154 return udp_sendmsg(iocb, sk, msg, len);
1155 }
1156 }
1157
1158 if (up->pending == AF_INET)
1159 return udp_sendmsg(iocb, sk, msg, len);
1160
1161 /* Rough check on arithmetic overflow,
1162 better check is made in ip6_append_data().
1163 */
1164 if (len > INT_MAX - sizeof(struct udphdr))
1165 return -EMSGSIZE;
1166
1167 if (up->pending) {
1168 /*
1169 * There are pending frames.
1170 * The socket lock must be held while it's corked.
1171 */
1172 lock_sock(sk);
1173 if (likely(up->pending)) {
1174 if (unlikely(up->pending != AF_INET6)) {
1175 release_sock(sk);
1176 return -EAFNOSUPPORT;
1177 }
1178 dst = NULL;
1179 goto do_append_data;
1180 }
1181 release_sock(sk);
1182 }
1183 ulen += sizeof(struct udphdr);
1184
1185 memset(&fl6, 0, sizeof(fl6));
1186
1187 if (sin6) {
1188 if (sin6->sin6_port == 0)
1189 return -EINVAL;
1190
1191 fl6.fl6_dport = sin6->sin6_port;
1192 daddr = &sin6->sin6_addr;
1193
1194 if (np->sndflow) {
1195 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
1196 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
1197 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1198 if (flowlabel == NULL)
1199 return -EINVAL;
1200 }
1201 }
1202
1203 /*
1204 * Otherwise it will be difficult to maintain
1205 * sk->sk_dst_cache.
1206 */
1207 if (sk->sk_state == TCP_ESTABLISHED &&
1208 ipv6_addr_equal(daddr, &sk->sk_v6_daddr))
1209 daddr = &sk->sk_v6_daddr;
1210
1211 if (addr_len >= sizeof(struct sockaddr_in6) &&
1212 sin6->sin6_scope_id &&
1213 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
1214 fl6.flowi6_oif = sin6->sin6_scope_id;
1215 } else {
1216 if (sk->sk_state != TCP_ESTABLISHED)
1217 return -EDESTADDRREQ;
1218
1219 fl6.fl6_dport = inet->inet_dport;
1220 daddr = &sk->sk_v6_daddr;
1221 fl6.flowlabel = np->flow_label;
1222 connected = 1;
1223 }
1224
1225 if (!fl6.flowi6_oif)
1226 fl6.flowi6_oif = sk->sk_bound_dev_if;
1227
1228 if (!fl6.flowi6_oif)
1229 fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex;
1230
1231 fl6.flowi6_mark = sk->sk_mark;
1232
1233 if (msg->msg_controllen) {
1234 opt = &opt_space;
1235 memset(opt, 0, sizeof(struct ipv6_txoptions));
1236 opt->tot_len = sizeof(*opt);
1237
1238 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt,
1239 &hlimit, &tclass, &dontfrag);
1240 if (err < 0) {
1241 fl6_sock_release(flowlabel);
1242 return err;
1243 }
1244 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
1245 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1246 if (flowlabel == NULL)
1247 return -EINVAL;
1248 }
1249 if (!(opt->opt_nflen|opt->opt_flen))
1250 opt = NULL;
1251 connected = 0;
1252 }
1253 if (opt == NULL)
1254 opt = np->opt;
1255 if (flowlabel)
1256 opt = fl6_merge_options(&opt_space, flowlabel, opt);
1257 opt = ipv6_fixup_options(&opt_space, opt);
1258
1259 fl6.flowi6_proto = sk->sk_protocol;
1260 if (!ipv6_addr_any(daddr))
1261 fl6.daddr = *daddr;
1262 else
1263 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
1264 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
1265 fl6.saddr = np->saddr;
1266 fl6.fl6_sport = inet->inet_sport;
1267
1268 final_p = fl6_update_dst(&fl6, opt, &final);
1269 if (final_p)
1270 connected = 0;
1271
1272 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) {
1273 fl6.flowi6_oif = np->mcast_oif;
1274 connected = 0;
1275 } else if (!fl6.flowi6_oif)
1276 fl6.flowi6_oif = np->ucast_oif;
1277
1278 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
1279
1280 dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p);
1281 if (IS_ERR(dst)) {
1282 err = PTR_ERR(dst);
1283 dst = NULL;
1284 goto out;
1285 }
1286
1287 if (hlimit < 0)
1288 hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
1289
1290 if (tclass < 0)
1291 tclass = np->tclass;
1292
1293 if (msg->msg_flags&MSG_CONFIRM)
1294 goto do_confirm;
1295 back_from_confirm:
1296
1297 lock_sock(sk);
1298 if (unlikely(up->pending)) {
1299 /* The socket is already corked while preparing it. */
1300 /* ... which is an evident application bug. --ANK */
1301 release_sock(sk);
1302
1303 net_dbg_ratelimited("udp cork app bug 2\n");
1304 err = -EINVAL;
1305 goto out;
1306 }
1307
1308 up->pending = AF_INET6;
1309
1310 do_append_data:
1311 if (dontfrag < 0)
1312 dontfrag = np->dontfrag;
1313 up->len += ulen;
1314 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
1315 err = ip6_append_data(sk, getfrag, msg, ulen,
1316 sizeof(struct udphdr), hlimit, tclass, opt, &fl6,
1317 (struct rt6_info *)dst,
1318 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, dontfrag);
1319 if (err)
1320 udp_v6_flush_pending_frames(sk);
1321 else if (!corkreq)
1322 err = udp_v6_push_pending_frames(sk);
1323 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
1324 up->pending = 0;
1325
1326 if (dst) {
1327 if (connected) {
1328 ip6_dst_store(sk, dst,
1329 ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ?
1330 &sk->sk_v6_daddr : NULL,
1331 #ifdef CONFIG_IPV6_SUBTREES
1332 ipv6_addr_equal(&fl6.saddr, &np->saddr) ?
1333 &np->saddr :
1334 #endif
1335 NULL);
1336 } else {
1337 dst_release(dst);
1338 }
1339 dst = NULL;
1340 }
1341
1342 if (err > 0)
1343 err = np->recverr ? net_xmit_errno(err) : 0;
1344 release_sock(sk);
1345 out:
1346 dst_release(dst);
1347 fl6_sock_release(flowlabel);
1348 if (!err)
1349 return len;
1350 /*
1351 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
1352 * ENOBUFS might not be good (it's not tunable per se), but otherwise
1353 * we don't have a good statistic (IpOutDiscards but it can be too many
1354 * things). We could add another new stat but at least for now that
1355 * seems like overkill.
1356 */
1357 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
1358 UDP6_INC_STATS_USER(sock_net(sk),
1359 UDP_MIB_SNDBUFERRORS, is_udplite);
1360 }
1361 return err;
1362
1363 do_confirm:
1364 dst_confirm(dst);
1365 if (!(msg->msg_flags&MSG_PROBE) || len)
1366 goto back_from_confirm;
1367 err = 0;
1368 goto out;
1369 }
1370
1371 void udpv6_destroy_sock(struct sock *sk)
1372 {
1373 struct udp_sock *up = udp_sk(sk);
1374 lock_sock(sk);
1375 udp_v6_flush_pending_frames(sk);
1376 release_sock(sk);
1377
1378 if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
1379 void (*encap_destroy)(struct sock *sk);
1380 encap_destroy = ACCESS_ONCE(up->encap_destroy);
1381 if (encap_destroy)
1382 encap_destroy(sk);
1383 }
1384
1385 inet6_destroy_sock(sk);
1386 }
1387
1388 /*
1389 * Socket option code for UDP
1390 */
1391 int udpv6_setsockopt(struct sock *sk, int level, int optname,
1392 char __user *optval, unsigned int optlen)
1393 {
1394 if (level == SOL_UDP || level == SOL_UDPLITE)
1395 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1396 udp_v6_push_pending_frames);
1397 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1398 }
1399
1400 #ifdef CONFIG_COMPAT
1401 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
1402 char __user *optval, unsigned int optlen)
1403 {
1404 if (level == SOL_UDP || level == SOL_UDPLITE)
1405 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1406 udp_v6_push_pending_frames);
1407 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
1408 }
1409 #endif
1410
1411 int udpv6_getsockopt(struct sock *sk, int level, int optname,
1412 char __user *optval, int __user *optlen)
1413 {
1414 if (level == SOL_UDP || level == SOL_UDPLITE)
1415 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1416 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1417 }
1418
1419 #ifdef CONFIG_COMPAT
1420 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
1421 char __user *optval, int __user *optlen)
1422 {
1423 if (level == SOL_UDP || level == SOL_UDPLITE)
1424 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1425 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
1426 }
1427 #endif
1428
1429 static const struct inet6_protocol udpv6_protocol = {
1430 .handler = udpv6_rcv,
1431 .err_handler = udpv6_err,
1432 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1433 };
1434
1435 /* ------------------------------------------------------------------------ */
1436 #ifdef CONFIG_PROC_FS
1437 int udp6_seq_show(struct seq_file *seq, void *v)
1438 {
1439 if (v == SEQ_START_TOKEN) {
1440 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
1441 } else {
1442 int bucket = ((struct udp_iter_state *)seq->private)->bucket;
1443 struct inet_sock *inet = inet_sk(v);
1444 __u16 srcp = ntohs(inet->inet_sport);
1445 __u16 destp = ntohs(inet->inet_dport);
1446 ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket);
1447 }
1448 return 0;
1449 }
1450
1451 static const struct file_operations udp6_afinfo_seq_fops = {
1452 .owner = THIS_MODULE,
1453 .open = udp_seq_open,
1454 .read = seq_read,
1455 .llseek = seq_lseek,
1456 .release = seq_release_net
1457 };
1458
1459 static struct udp_seq_afinfo udp6_seq_afinfo = {
1460 .name = "udp6",
1461 .family = AF_INET6,
1462 .udp_table = &udp_table,
1463 .seq_fops = &udp6_afinfo_seq_fops,
1464 .seq_ops = {
1465 .show = udp6_seq_show,
1466 },
1467 };
1468
1469 int __net_init udp6_proc_init(struct net *net)
1470 {
1471 return udp_proc_register(net, &udp6_seq_afinfo);
1472 }
1473
1474 void udp6_proc_exit(struct net *net) {
1475 udp_proc_unregister(net, &udp6_seq_afinfo);
1476 }
1477 #endif /* CONFIG_PROC_FS */
1478
1479 void udp_v6_clear_sk(struct sock *sk, int size)
1480 {
1481 struct inet_sock *inet = inet_sk(sk);
1482
1483 /* we do not want to clear pinet6 field, because of RCU lookups */
1484 sk_prot_clear_portaddr_nulls(sk, offsetof(struct inet_sock, pinet6));
1485
1486 size -= offsetof(struct inet_sock, pinet6) + sizeof(inet->pinet6);
1487 memset(&inet->pinet6 + 1, 0, size);
1488 }
1489
1490 /* ------------------------------------------------------------------------ */
1491
1492 struct proto udpv6_prot = {
1493 .name = "UDPv6",
1494 .owner = THIS_MODULE,
1495 .close = udp_lib_close,
1496 .connect = ip6_datagram_connect,
1497 .disconnect = udp_disconnect,
1498 .ioctl = udp_ioctl,
1499 .destroy = udpv6_destroy_sock,
1500 .setsockopt = udpv6_setsockopt,
1501 .getsockopt = udpv6_getsockopt,
1502 .sendmsg = udpv6_sendmsg,
1503 .recvmsg = udpv6_recvmsg,
1504 .backlog_rcv = __udpv6_queue_rcv_skb,
1505 .hash = udp_lib_hash,
1506 .unhash = udp_lib_unhash,
1507 .rehash = udp_v6_rehash,
1508 .get_port = udp_v6_get_port,
1509 .memory_allocated = &udp_memory_allocated,
1510 .sysctl_mem = sysctl_udp_mem,
1511 .sysctl_wmem = &sysctl_udp_wmem_min,
1512 .sysctl_rmem = &sysctl_udp_rmem_min,
1513 .obj_size = sizeof(struct udp6_sock),
1514 .slab_flags = SLAB_DESTROY_BY_RCU,
1515 .h.udp_table = &udp_table,
1516 #ifdef CONFIG_COMPAT
1517 .compat_setsockopt = compat_udpv6_setsockopt,
1518 .compat_getsockopt = compat_udpv6_getsockopt,
1519 #endif
1520 .clear_sk = udp_v6_clear_sk,
1521 };
1522
1523 static struct inet_protosw udpv6_protosw = {
1524 .type = SOCK_DGRAM,
1525 .protocol = IPPROTO_UDP,
1526 .prot = &udpv6_prot,
1527 .ops = &inet6_dgram_ops,
1528 .flags = INET_PROTOSW_PERMANENT,
1529 };
1530
1531
1532 int __init udpv6_init(void)
1533 {
1534 int ret;
1535
1536 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
1537 if (ret)
1538 goto out;
1539
1540 ret = inet6_register_protosw(&udpv6_protosw);
1541 if (ret)
1542 goto out_udpv6_protocol;
1543 out:
1544 return ret;
1545
1546 out_udpv6_protocol:
1547 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1548 goto out;
1549 }
1550
1551 void udpv6_exit(void)
1552 {
1553 inet6_unregister_protosw(&udpv6_protosw);
1554 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1555 }
Linux kernel - Deliverables
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