projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge branch 'dmi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvar...
[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 #include <net/sock_reuseport.h>
51
52 #include <linux/proc_fs.h>
53 #include <linux/seq_file.h>
54 #include <trace/events/skb.h>
55 #include "udp_impl.h"
56
57 static u32 udp6_ehashfn(const struct net *net,
58 const struct in6_addr *laddr,
59 const u16 lport,
60 const struct in6_addr *faddr,
61 const __be16 fport)
62 {
63 static u32 udp6_ehash_secret __read_mostly;
64 static u32 udp_ipv6_hash_secret __read_mostly;
65
66 u32 lhash, fhash;
67
68 net_get_random_once(&udp6_ehash_secret,
69 sizeof(udp6_ehash_secret));
70 net_get_random_once(&udp_ipv6_hash_secret,
71 sizeof(udp_ipv6_hash_secret));
72
73 lhash = (__force u32)laddr->s6_addr32[3];
74 fhash = __ipv6_addr_jhash(faddr, udp_ipv6_hash_secret);
75
76 return __inet6_ehashfn(lhash, lport, fhash, fport,
77 udp_ipv6_hash_secret + net_hash_mix(net));
78 }
79
80 /* match_wildcard == true: IPV6_ADDR_ANY equals to any IPv6 addresses if IPv6
81 * only, and any IPv4 addresses if not IPv6 only
82 * match_wildcard == false: addresses must be exactly the same, i.e.
83 * IPV6_ADDR_ANY only equals to IPV6_ADDR_ANY,
84 * and 0.0.0.0 equals to 0.0.0.0 only
85 */
86 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2,
87 bool match_wildcard)
88 {
89 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
90 int sk2_ipv6only = inet_v6_ipv6only(sk2);
91 int addr_type = ipv6_addr_type(&sk->sk_v6_rcv_saddr);
92 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
93
94 /* if both are mapped, treat as IPv4 */
95 if (addr_type == IPV6_ADDR_MAPPED && addr_type2 == IPV6_ADDR_MAPPED) {
96 if (!sk2_ipv6only) {
97 if (sk->sk_rcv_saddr == sk2->sk_rcv_saddr)
98 return 1;
99 if (!sk->sk_rcv_saddr || !sk2->sk_rcv_saddr)
100 return match_wildcard;
101 }
102 return 0;
103 }
104
105 if (addr_type == IPV6_ADDR_ANY && addr_type2 == IPV6_ADDR_ANY)
106 return 1;
107
108 if (addr_type2 == IPV6_ADDR_ANY && match_wildcard &&
109 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
110 return 1;
111
112 if (addr_type == IPV6_ADDR_ANY && match_wildcard &&
113 !(ipv6_only_sock(sk) && addr_type2 == IPV6_ADDR_MAPPED))
114 return 1;
115
116 if (sk2_rcv_saddr6 &&
117 ipv6_addr_equal(&sk->sk_v6_rcv_saddr, sk2_rcv_saddr6))
118 return 1;
119
120 return 0;
121 }
122
123 static u32 udp6_portaddr_hash(const struct net *net,
124 const struct in6_addr *addr6,
125 unsigned int port)
126 {
127 unsigned int hash, mix = net_hash_mix(net);
128
129 if (ipv6_addr_any(addr6))
130 hash = jhash_1word(0, mix);
131 else if (ipv6_addr_v4mapped(addr6))
132 hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix);
133 else
134 hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix);
135
136 return hash ^ port;
137 }
138
139 int udp_v6_get_port(struct sock *sk, unsigned short snum)
140 {
141 unsigned int hash2_nulladdr =
142 udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum);
143 unsigned int hash2_partial =
144 udp6_portaddr_hash(sock_net(sk), &sk->sk_v6_rcv_saddr, 0);
145
146 /* precompute partial secondary hash */
147 udp_sk(sk)->udp_portaddr_hash = hash2_partial;
148 return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal, hash2_nulladdr);
149 }
150
151 static void udp_v6_rehash(struct sock *sk)
152 {
153 u16 new_hash = udp6_portaddr_hash(sock_net(sk),
154 &sk->sk_v6_rcv_saddr,
155 inet_sk(sk)->inet_num);
156
157 udp_lib_rehash(sk, new_hash);
158 }
159
160 static inline int compute_score(struct sock *sk, struct net *net,
161 unsigned short hnum,
162 const struct in6_addr *saddr, __be16 sport,
163 const struct in6_addr *daddr, __be16 dport,
164 int dif)
165 {
166 int score;
167 struct inet_sock *inet;
168
169 if (!net_eq(sock_net(sk), net) ||
170 udp_sk(sk)->udp_port_hash != hnum ||
171 sk->sk_family != PF_INET6)
172 return -1;
173
174 score = 0;
175 inet = inet_sk(sk);
176
177 if (inet->inet_dport) {
178 if (inet->inet_dport != sport)
179 return -1;
180 score++;
181 }
182
183 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
184 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr))
185 return -1;
186 score++;
187 }
188
189 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
190 if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr))
191 return -1;
192 score++;
193 }
194
195 if (sk->sk_bound_dev_if) {
196 if (sk->sk_bound_dev_if != dif)
197 return -1;
198 score++;
199 }
200
201 if (sk->sk_incoming_cpu == raw_smp_processor_id())
202 score++;
203
204 return score;
205 }
206
207 static inline int compute_score2(struct sock *sk, struct net *net,
208 const struct in6_addr *saddr, __be16 sport,
209 const struct in6_addr *daddr,
210 unsigned short hnum, int dif)
211 {
212 int score;
213 struct inet_sock *inet;
214
215 if (!net_eq(sock_net(sk), net) ||
216 udp_sk(sk)->udp_port_hash != hnum ||
217 sk->sk_family != PF_INET6)
218 return -1;
219
220 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr))
221 return -1;
222
223 score = 0;
224 inet = inet_sk(sk);
225
226 if (inet->inet_dport) {
227 if (inet->inet_dport != sport)
228 return -1;
229 score++;
230 }
231
232 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
233 if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr))
234 return -1;
235 score++;
236 }
237
238 if (sk->sk_bound_dev_if) {
239 if (sk->sk_bound_dev_if != dif)
240 return -1;
241 score++;
242 }
243
244 if (sk->sk_incoming_cpu == raw_smp_processor_id())
245 score++;
246
247 return score;
248 }
249
250 /* called with read_rcu_lock() */
251 static struct sock *udp6_lib_lookup2(struct net *net,
252 const struct in6_addr *saddr, __be16 sport,
253 const struct in6_addr *daddr, unsigned int hnum, int dif,
254 struct udp_hslot *hslot2, unsigned int slot2,
255 struct sk_buff *skb)
256 {
257 struct sock *sk, *result;
258 struct hlist_nulls_node *node;
259 int score, badness, matches = 0, reuseport = 0;
260 u32 hash = 0;
261
262 begin:
263 result = NULL;
264 badness = -1;
265 udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) {
266 score = compute_score2(sk, net, saddr, sport,
267 daddr, hnum, dif);
268 if (score > badness) {
269 result = sk;
270 badness = score;
271 reuseport = sk->sk_reuseport;
272 if (reuseport) {
273 struct sock *sk2;
274 hash = udp6_ehashfn(net, daddr, hnum,
275 saddr, sport);
276 sk2 = reuseport_select_sock(sk, hash, skb,
277 sizeof(struct udphdr));
278 if (sk2) {
279 result = sk2;
280 goto found;
281 }
282 matches = 1;
283 }
284 } else if (score == badness && reuseport) {
285 matches++;
286 if (reciprocal_scale(hash, matches) == 0)
287 result = sk;
288 hash = next_pseudo_random32(hash);
289 }
290 }
291 /*
292 * if the nulls value we got at the end of this lookup is
293 * not the expected one, we must restart lookup.
294 * We probably met an item that was moved to another chain.
295 */
296 if (get_nulls_value(node) != slot2)
297 goto begin;
298
299 if (result) {
300 found:
301 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
302 result = NULL;
303 else if (unlikely(compute_score2(result, net, saddr, sport,
304 daddr, hnum, dif) < badness)) {
305 sock_put(result);
306 goto begin;
307 }
308 }
309 return result;
310 }
311
312 struct sock *__udp6_lib_lookup(struct net *net,
313 const struct in6_addr *saddr, __be16 sport,
314 const struct in6_addr *daddr, __be16 dport,
315 int dif, struct udp_table *udptable,
316 struct sk_buff *skb)
317 {
318 struct sock *sk, *result;
319 struct hlist_nulls_node *node;
320 unsigned short hnum = ntohs(dport);
321 unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask);
322 struct udp_hslot *hslot2, *hslot = &udptable->hash[slot];
323 int score, badness, matches = 0, reuseport = 0;
324 u32 hash = 0;
325
326 rcu_read_lock();
327 if (hslot->count > 10) {
328 hash2 = udp6_portaddr_hash(net, daddr, hnum);
329 slot2 = hash2 & udptable->mask;
330 hslot2 = &udptable->hash2[slot2];
331 if (hslot->count < hslot2->count)
332 goto begin;
333
334 result = udp6_lib_lookup2(net, saddr, sport,
335 daddr, hnum, dif,
336 hslot2, slot2, skb);
337 if (!result) {
338 hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum);
339 slot2 = hash2 & udptable->mask;
340 hslot2 = &udptable->hash2[slot2];
341 if (hslot->count < hslot2->count)
342 goto begin;
343
344 result = udp6_lib_lookup2(net, saddr, sport,
345 &in6addr_any, hnum, dif,
346 hslot2, slot2, skb);
347 }
348 rcu_read_unlock();
349 return result;
350 }
351 begin:
352 result = NULL;
353 badness = -1;
354 sk_nulls_for_each_rcu(sk, node, &hslot->head) {
355 score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif);
356 if (score > badness) {
357 result = sk;
358 badness = score;
359 reuseport = sk->sk_reuseport;
360 if (reuseport) {
361 struct sock *sk2;
362 hash = udp6_ehashfn(net, daddr, hnum,
363 saddr, sport);
364 sk2 = reuseport_select_sock(sk, hash, skb,
365 sizeof(struct udphdr));
366 if (sk2) {
367 result = sk2;
368 goto found;
369 }
370 matches = 1;
371 }
372 } else if (score == badness && reuseport) {
373 matches++;
374 if (reciprocal_scale(hash, matches) == 0)
375 result = sk;
376 hash = next_pseudo_random32(hash);
377 }
378 }
379 /*
380 * if the nulls value we got at the end of this lookup is
381 * not the expected one, we must restart lookup.
382 * We probably met an item that was moved to another chain.
383 */
384 if (get_nulls_value(node) != slot)
385 goto begin;
386
387 if (result) {
388 found:
389 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
390 result = NULL;
391 else if (unlikely(compute_score(result, net, hnum, saddr, sport,
392 daddr, dport, dif) < badness)) {
393 sock_put(result);
394 goto begin;
395 }
396 }
397 rcu_read_unlock();
398 return result;
399 }
400 EXPORT_SYMBOL_GPL(__udp6_lib_lookup);
401
402 static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb,
403 __be16 sport, __be16 dport,
404 struct udp_table *udptable)
405 {
406 struct sock *sk;
407 const struct ipv6hdr *iph = ipv6_hdr(skb);
408
409 sk = skb_steal_sock(skb);
410 if (unlikely(sk))
411 return sk;
412 return __udp6_lib_lookup(dev_net(skb_dst(skb)->dev), &iph->saddr, sport,
413 &iph->daddr, dport, inet6_iif(skb),
414 udptable, skb);
415 }
416
417 struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport,
418 const struct in6_addr *daddr, __be16 dport, int dif)
419 {
420 return __udp6_lib_lookup(net, saddr, sport, daddr, dport, dif, &udp_table, NULL);
421 }
422 EXPORT_SYMBOL_GPL(udp6_lib_lookup);
423
424 /*
425 * This should be easy, if there is something there we
426 * return it, otherwise we block.
427 */
428
429 int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
430 int noblock, int flags, int *addr_len)
431 {
432 struct ipv6_pinfo *np = inet6_sk(sk);
433 struct inet_sock *inet = inet_sk(sk);
434 struct sk_buff *skb;
435 unsigned int ulen, copied;
436 int peeked, off = 0;
437 int err;
438 int is_udplite = IS_UDPLITE(sk);
439 bool checksum_valid = false;
440 int is_udp4;
441 bool slow;
442
443 if (flags & MSG_ERRQUEUE)
444 return ipv6_recv_error(sk, msg, len, addr_len);
445
446 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
447 return ipv6_recv_rxpmtu(sk, msg, len, addr_len);
448
449 try_again:
450 skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),
451 &peeked, &off, &err);
452 if (!skb)
453 goto out;
454
455 ulen = skb->len - sizeof(struct udphdr);
456 copied = len;
457 if (copied > ulen)
458 copied = ulen;
459 else if (copied < ulen)
460 msg->msg_flags |= MSG_TRUNC;
461
462 is_udp4 = (skb->protocol == htons(ETH_P_IP));
463
464 /*
465 * If checksum is needed at all, try to do it while copying the
466 * data. If the data is truncated, or if we only want a partial
467 * coverage checksum (UDP-Lite), do it before the copy.
468 */
469
470 if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) {
471 checksum_valid = !udp_lib_checksum_complete(skb);
472 if (!checksum_valid)
473 goto csum_copy_err;
474 }
475
476 if (checksum_valid || skb_csum_unnecessary(skb))
477 err = skb_copy_datagram_msg(skb, sizeof(struct udphdr),
478 msg, copied);
479 else {
480 err = skb_copy_and_csum_datagram_msg(skb, sizeof(struct udphdr), msg);
481 if (err == -EINVAL)
482 goto csum_copy_err;
483 }
484 if (unlikely(err)) {
485 trace_kfree_skb(skb, udpv6_recvmsg);
486 if (!peeked) {
487 atomic_inc(&sk->sk_drops);
488 if (is_udp4)
489 UDP_INC_STATS_USER(sock_net(sk),
490 UDP_MIB_INERRORS,
491 is_udplite);
492 else
493 UDP6_INC_STATS_USER(sock_net(sk),
494 UDP_MIB_INERRORS,
495 is_udplite);
496 }
497 goto out_free;
498 }
499 if (!peeked) {
500 if (is_udp4)
501 UDP_INC_STATS_USER(sock_net(sk),
502 UDP_MIB_INDATAGRAMS, is_udplite);
503 else
504 UDP6_INC_STATS_USER(sock_net(sk),
505 UDP_MIB_INDATAGRAMS, is_udplite);
506 }
507
508 sock_recv_ts_and_drops(msg, sk, skb);
509
510 /* Copy the address. */
511 if (msg->msg_name) {
512 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
513 sin6->sin6_family = AF_INET6;
514 sin6->sin6_port = udp_hdr(skb)->source;
515 sin6->sin6_flowinfo = 0;
516
517 if (is_udp4) {
518 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
519 &sin6->sin6_addr);
520 sin6->sin6_scope_id = 0;
521 } else {
522 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
523 sin6->sin6_scope_id =
524 ipv6_iface_scope_id(&sin6->sin6_addr,
525 inet6_iif(skb));
526 }
527 *addr_len = sizeof(*sin6);
528 }
529
530 if (np->rxopt.all)
531 ip6_datagram_recv_common_ctl(sk, msg, skb);
532
533 if (is_udp4) {
534 if (inet->cmsg_flags)
535 ip_cmsg_recv(msg, skb);
536 } else {
537 if (np->rxopt.all)
538 ip6_datagram_recv_specific_ctl(sk, msg, skb);
539 }
540
541 err = copied;
542 if (flags & MSG_TRUNC)
543 err = ulen;
544
545 out_free:
546 skb_free_datagram_locked(sk, skb);
547 out:
548 return err;
549
550 csum_copy_err:
551 slow = lock_sock_fast(sk);
552 if (!skb_kill_datagram(sk, skb, flags)) {
553 if (is_udp4) {
554 UDP_INC_STATS_USER(sock_net(sk),
555 UDP_MIB_CSUMERRORS, is_udplite);
556 UDP_INC_STATS_USER(sock_net(sk),
557 UDP_MIB_INERRORS, is_udplite);
558 } else {
559 UDP6_INC_STATS_USER(sock_net(sk),
560 UDP_MIB_CSUMERRORS, is_udplite);
561 UDP6_INC_STATS_USER(sock_net(sk),
562 UDP_MIB_INERRORS, is_udplite);
563 }
564 }
565 unlock_sock_fast(sk, slow);
566
567 /* starting over for a new packet, but check if we need to yield */
568 cond_resched();
569 msg->msg_flags &= ~MSG_TRUNC;
570 goto try_again;
571 }
572
573 void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
574 u8 type, u8 code, int offset, __be32 info,
575 struct udp_table *udptable)
576 {
577 struct ipv6_pinfo *np;
578 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
579 const struct in6_addr *saddr = &hdr->saddr;
580 const struct in6_addr *daddr = &hdr->daddr;
581 struct udphdr *uh = (struct udphdr *)(skb->data+offset);
582 struct sock *sk;
583 int err;
584 struct net *net = dev_net(skb->dev);
585
586 sk = __udp6_lib_lookup(net, daddr, uh->dest, saddr, uh->source,
587 inet6_iif(skb), udptable, skb);
588 if (!sk) {
589 ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev),
590 ICMP6_MIB_INERRORS);
591 return;
592 }
593
594 if (type == ICMPV6_PKT_TOOBIG) {
595 if (!ip6_sk_accept_pmtu(sk))
596 goto out;
597 ip6_sk_update_pmtu(skb, sk, info);
598 }
599 if (type == NDISC_REDIRECT) {
600 ip6_sk_redirect(skb, sk);
601 goto out;
602 }
603
604 np = inet6_sk(sk);
605
606 if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
607 goto out;
608
609 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
610 goto out;
611
612 if (np->recverr)
613 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
614
615 sk->sk_err = err;
616 sk->sk_error_report(sk);
617 out:
618 sock_put(sk);
619 }
620
621 static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
622 {
623 int rc;
624
625 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
626 sock_rps_save_rxhash(sk, skb);
627 sk_mark_napi_id(sk, skb);
628 sk_incoming_cpu_update(sk);
629 }
630
631 rc = sock_queue_rcv_skb(sk, skb);
632 if (rc < 0) {
633 int is_udplite = IS_UDPLITE(sk);
634
635 /* Note that an ENOMEM error is charged twice */
636 if (rc == -ENOMEM)
637 UDP6_INC_STATS_BH(sock_net(sk),
638 UDP_MIB_RCVBUFERRORS, is_udplite);
639 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
640 kfree_skb(skb);
641 return -1;
642 }
643 return 0;
644 }
645
646 static __inline__ void udpv6_err(struct sk_buff *skb,
647 struct inet6_skb_parm *opt, u8 type,
648 u8 code, int offset, __be32 info)
649 {
650 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table);
651 }
652
653 static struct static_key udpv6_encap_needed __read_mostly;
654 void udpv6_encap_enable(void)
655 {
656 if (!static_key_enabled(&udpv6_encap_needed))
657 static_key_slow_inc(&udpv6_encap_needed);
658 }
659 EXPORT_SYMBOL(udpv6_encap_enable);
660
661 int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
662 {
663 struct udp_sock *up = udp_sk(sk);
664 int rc;
665 int is_udplite = IS_UDPLITE(sk);
666
667 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
668 goto drop;
669
670 if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
671 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
672
673 /*
674 * This is an encapsulation socket so pass the skb to
675 * the socket's udp_encap_rcv() hook. Otherwise, just
676 * fall through and pass this up the UDP socket.
677 * up->encap_rcv() returns the following value:
678 * =0 if skb was successfully passed to the encap
679 * handler or was discarded by it.
680 * >0 if skb should be passed on to UDP.
681 * <0 if skb should be resubmitted as proto -N
682 */
683
684 /* if we're overly short, let UDP handle it */
685 encap_rcv = ACCESS_ONCE(up->encap_rcv);
686 if (skb->len > sizeof(struct udphdr) && encap_rcv) {
687 int ret;
688
689 /* Verify checksum before giving to encap */
690 if (udp_lib_checksum_complete(skb))
691 goto csum_error;
692
693 ret = encap_rcv(sk, skb);
694 if (ret <= 0) {
695 UDP_INC_STATS_BH(sock_net(sk),
696 UDP_MIB_INDATAGRAMS,
697 is_udplite);
698 return -ret;
699 }
700 }
701
702 /* FALLTHROUGH -- it's a UDP Packet */
703 }
704
705 /*
706 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
707 */
708 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
709
710 if (up->pcrlen == 0) { /* full coverage was set */
711 net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n",
712 UDP_SKB_CB(skb)->cscov, skb->len);
713 goto drop;
714 }
715 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
716 net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n",
717 UDP_SKB_CB(skb)->cscov, up->pcrlen);
718 goto drop;
719 }
720 }
721
722 if (rcu_access_pointer(sk->sk_filter)) {
723 if (udp_lib_checksum_complete(skb))
724 goto csum_error;
725 }
726
727 if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
728 UDP6_INC_STATS_BH(sock_net(sk),
729 UDP_MIB_RCVBUFERRORS, is_udplite);
730 goto drop;
731 }
732
733 skb_dst_drop(skb);
734
735 bh_lock_sock(sk);
736 rc = 0;
737 if (!sock_owned_by_user(sk))
738 rc = __udpv6_queue_rcv_skb(sk, skb);
739 else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
740 bh_unlock_sock(sk);
741 goto drop;
742 }
743 bh_unlock_sock(sk);
744
745 return rc;
746
747 csum_error:
748 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite);
749 drop:
750 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
751 atomic_inc(&sk->sk_drops);
752 kfree_skb(skb);
753 return -1;
754 }
755
756 static bool __udp_v6_is_mcast_sock(struct net *net, struct sock *sk,
757 __be16 loc_port, const struct in6_addr *loc_addr,
758 __be16 rmt_port, const struct in6_addr *rmt_addr,
759 int dif, unsigned short hnum)
760 {
761 struct inet_sock *inet = inet_sk(sk);
762
763 if (!net_eq(sock_net(sk), net))
764 return false;
765
766 if (udp_sk(sk)->udp_port_hash != hnum ||
767 sk->sk_family != PF_INET6 ||
768 (inet->inet_dport && inet->inet_dport != rmt_port) ||
769 (!ipv6_addr_any(&sk->sk_v6_daddr) &&
770 !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) ||
771 (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif) ||
772 (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) &&
773 !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr)))
774 return false;
775 if (!inet6_mc_check(sk, loc_addr, rmt_addr))
776 return false;
777 return true;
778 }
779
780 static void flush_stack(struct sock **stack, unsigned int count,
781 struct sk_buff *skb, unsigned int final)
782 {
783 struct sk_buff *skb1 = NULL;
784 struct sock *sk;
785 unsigned int i;
786
787 for (i = 0; i < count; i++) {
788 sk = stack[i];
789 if (likely(!skb1))
790 skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC);
791 if (!skb1) {
792 atomic_inc(&sk->sk_drops);
793 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS,
794 IS_UDPLITE(sk));
795 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS,
796 IS_UDPLITE(sk));
797 }
798
799 if (skb1 && udpv6_queue_rcv_skb(sk, skb1) <= 0)
800 skb1 = NULL;
801 sock_put(sk);
802 }
803 if (unlikely(skb1))
804 kfree_skb(skb1);
805 }
806
807 static void udp6_csum_zero_error(struct sk_buff *skb)
808 {
809 /* RFC 2460 section 8.1 says that we SHOULD log
810 * this error. Well, it is reasonable.
811 */
812 net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n",
813 &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source),
814 &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest));
815 }
816
817 /*
818 * Note: called only from the BH handler context,
819 * so we don't need to lock the hashes.
820 */
821 static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
822 const struct in6_addr *saddr, const struct in6_addr *daddr,
823 struct udp_table *udptable, int proto)
824 {
825 struct sock *sk, *stack[256 / sizeof(struct sock *)];
826 const struct udphdr *uh = udp_hdr(skb);
827 struct hlist_nulls_node *node;
828 unsigned short hnum = ntohs(uh->dest);
829 struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum);
830 int dif = inet6_iif(skb);
831 unsigned int count = 0, offset = offsetof(typeof(*sk), sk_nulls_node);
832 unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10);
833 bool inner_flushed = false;
834
835 if (use_hash2) {
836 hash2_any = udp6_portaddr_hash(net, &in6addr_any, hnum) &
837 udp_table.mask;
838 hash2 = udp6_portaddr_hash(net, daddr, hnum) & udp_table.mask;
839 start_lookup:
840 hslot = &udp_table.hash2[hash2];
841 offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node);
842 }
843
844 spin_lock(&hslot->lock);
845 sk_nulls_for_each_entry_offset(sk, node, &hslot->head, offset) {
846 if (__udp_v6_is_mcast_sock(net, sk,
847 uh->dest, daddr,
848 uh->source, saddr,
849 dif, hnum) &&
850 /* If zero checksum and no_check is not on for
851 * the socket then skip it.
852 */
853 (uh->check || udp_sk(sk)->no_check6_rx)) {
854 if (unlikely(count == ARRAY_SIZE(stack))) {
855 flush_stack(stack, count, skb, ~0);
856 inner_flushed = true;
857 count = 0;
858 }
859 stack[count++] = sk;
860 sock_hold(sk);
861 }
862 }
863
864 spin_unlock(&hslot->lock);
865
866 /* Also lookup *:port if we are using hash2 and haven't done so yet. */
867 if (use_hash2 && hash2 != hash2_any) {
868 hash2 = hash2_any;
869 goto start_lookup;
870 }
871
872 if (count) {
873 flush_stack(stack, count, skb, count - 1);
874 } else {
875 if (!inner_flushed)
876 UDP_INC_STATS_BH(net, UDP_MIB_IGNOREDMULTI,
877 proto == IPPROTO_UDPLITE);
878 consume_skb(skb);
879 }
880 return 0;
881 }
882
883 int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
884 int proto)
885 {
886 struct net *net = dev_net(skb->dev);
887 struct sock *sk;
888 struct udphdr *uh;
889 const struct in6_addr *saddr, *daddr;
890 u32 ulen = 0;
891
892 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
893 goto discard;
894
895 saddr = &ipv6_hdr(skb)->saddr;
896 daddr = &ipv6_hdr(skb)->daddr;
897 uh = udp_hdr(skb);
898
899 ulen = ntohs(uh->len);
900 if (ulen > skb->len)
901 goto short_packet;
902
903 if (proto == IPPROTO_UDP) {
904 /* UDP validates ulen. */
905
906 /* Check for jumbo payload */
907 if (ulen == 0)
908 ulen = skb->len;
909
910 if (ulen < sizeof(*uh))
911 goto short_packet;
912
913 if (ulen < skb->len) {
914 if (pskb_trim_rcsum(skb, ulen))
915 goto short_packet;
916 saddr = &ipv6_hdr(skb)->saddr;
917 daddr = &ipv6_hdr(skb)->daddr;
918 uh = udp_hdr(skb);
919 }
920 }
921
922 if (udp6_csum_init(skb, uh, proto))
923 goto csum_error;
924
925 /*
926 * Multicast receive code
927 */
928 if (ipv6_addr_is_multicast(daddr))
929 return __udp6_lib_mcast_deliver(net, skb,
930 saddr, daddr, udptable, proto);
931
932 /* Unicast */
933
934 /*
935 * check socket cache ... must talk to Alan about his plans
936 * for sock caches... i'll skip this for now.
937 */
938 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
939 if (sk) {
940 int ret;
941
942 if (!uh->check && !udp_sk(sk)->no_check6_rx) {
943 sock_put(sk);
944 udp6_csum_zero_error(skb);
945 goto csum_error;
946 }
947
948 if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk))
949 skb_checksum_try_convert(skb, IPPROTO_UDP, uh->check,
950 ip6_compute_pseudo);
951
952 ret = udpv6_queue_rcv_skb(sk, skb);
953 sock_put(sk);
954
955 /* a return value > 0 means to resubmit the input, but
956 * it wants the return to be -protocol, or 0
957 */
958 if (ret > 0)
959 return -ret;
960
961 return 0;
962 }
963
964 if (!uh->check) {
965 udp6_csum_zero_error(skb);
966 goto csum_error;
967 }
968
969 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
970 goto discard;
971
972 if (udp_lib_checksum_complete(skb))
973 goto csum_error;
974
975 UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
976 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
977
978 kfree_skb(skb);
979 return 0;
980
981 short_packet:
982 net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n",
983 proto == IPPROTO_UDPLITE ? "-Lite" : "",
984 saddr, ntohs(uh->source),
985 ulen, skb->len,
986 daddr, ntohs(uh->dest));
987 goto discard;
988 csum_error:
989 UDP6_INC_STATS_BH(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE);
990 discard:
991 UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
992 kfree_skb(skb);
993 return 0;
994 }
995
996 static __inline__ int udpv6_rcv(struct sk_buff *skb)
997 {
998 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP);
999 }
1000
1001 /*
1002 * Throw away all pending data and cancel the corking. Socket is locked.
1003 */
1004 static void udp_v6_flush_pending_frames(struct sock *sk)
1005 {
1006 struct udp_sock *up = udp_sk(sk);
1007
1008 if (up->pending == AF_INET)
1009 udp_flush_pending_frames(sk);
1010 else if (up->pending) {
1011 up->len = 0;
1012 up->pending = 0;
1013 ip6_flush_pending_frames(sk);
1014 }
1015 }
1016
1017 /**
1018 * udp6_hwcsum_outgoing - handle outgoing HW checksumming
1019 * @sk: socket we are sending on
1020 * @skb: sk_buff containing the filled-in UDP header
1021 * (checksum field must be zeroed out)
1022 */
1023 static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
1024 const struct in6_addr *saddr,
1025 const struct in6_addr *daddr, int len)
1026 {
1027 unsigned int offset;
1028 struct udphdr *uh = udp_hdr(skb);
1029 struct sk_buff *frags = skb_shinfo(skb)->frag_list;
1030 __wsum csum = 0;
1031
1032 if (!frags) {
1033 /* Only one fragment on the socket. */
1034 skb->csum_start = skb_transport_header(skb) - skb->head;
1035 skb->csum_offset = offsetof(struct udphdr, check);
1036 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0);
1037 } else {
1038 /*
1039 * HW-checksum won't work as there are two or more
1040 * fragments on the socket so that all csums of sk_buffs
1041 * should be together
1042 */
1043 offset = skb_transport_offset(skb);
1044 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
1045
1046 skb->ip_summed = CHECKSUM_NONE;
1047
1048 do {
1049 csum = csum_add(csum, frags->csum);
1050 } while ((frags = frags->next));
1051
1052 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP,
1053 csum);
1054 if (uh->check == 0)
1055 uh->check = CSUM_MANGLED_0;
1056 }
1057 }
1058
1059 /*
1060 * Sending
1061 */
1062
1063 static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6)
1064 {
1065 struct sock *sk = skb->sk;
1066 struct udphdr *uh;
1067 int err = 0;
1068 int is_udplite = IS_UDPLITE(sk);
1069 __wsum csum = 0;
1070 int offset = skb_transport_offset(skb);
1071 int len = skb->len - offset;
1072
1073 /*
1074 * Create a UDP header
1075 */
1076 uh = udp_hdr(skb);
1077 uh->source = fl6->fl6_sport;
1078 uh->dest = fl6->fl6_dport;
1079 uh->len = htons(len);
1080 uh->check = 0;
1081
1082 if (is_udplite)
1083 csum = udplite_csum(skb);
1084 else if (udp_sk(sk)->no_check6_tx) { /* UDP csum disabled */
1085 skb->ip_summed = CHECKSUM_NONE;
1086 goto send;
1087 } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
1088 udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, len);
1089 goto send;
1090 } else
1091 csum = udp_csum(skb);
1092
1093 /* add protocol-dependent pseudo-header */
1094 uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
1095 len, fl6->flowi6_proto, csum);
1096 if (uh->check == 0)
1097 uh->check = CSUM_MANGLED_0;
1098
1099 send:
1100 err = ip6_send_skb(skb);
1101 if (err) {
1102 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) {
1103 UDP6_INC_STATS_USER(sock_net(sk),
1104 UDP_MIB_SNDBUFERRORS, is_udplite);
1105 err = 0;
1106 }
1107 } else
1108 UDP6_INC_STATS_USER(sock_net(sk),
1109 UDP_MIB_OUTDATAGRAMS, is_udplite);
1110 return err;
1111 }
1112
1113 static int udp_v6_push_pending_frames(struct sock *sk)
1114 {
1115 struct sk_buff *skb;
1116 struct udp_sock *up = udp_sk(sk);
1117 struct flowi6 fl6;
1118 int err = 0;
1119
1120 if (up->pending == AF_INET)
1121 return udp_push_pending_frames(sk);
1122
1123 /* ip6_finish_skb will release the cork, so make a copy of
1124 * fl6 here.
1125 */
1126 fl6 = inet_sk(sk)->cork.fl.u.ip6;
1127
1128 skb = ip6_finish_skb(sk);
1129 if (!skb)
1130 goto out;
1131
1132 err = udp_v6_send_skb(skb, &fl6);
1133
1134 out:
1135 up->len = 0;
1136 up->pending = 0;
1137 return err;
1138 }
1139
1140 int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
1141 {
1142 struct ipv6_txoptions opt_space;
1143 struct udp_sock *up = udp_sk(sk);
1144 struct inet_sock *inet = inet_sk(sk);
1145 struct ipv6_pinfo *np = inet6_sk(sk);
1146 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
1147 struct in6_addr *daddr, *final_p, final;
1148 struct ipv6_txoptions *opt = NULL;
1149 struct ipv6_txoptions *opt_to_free = NULL;
1150 struct ip6_flowlabel *flowlabel = NULL;
1151 struct flowi6 fl6;
1152 struct dst_entry *dst;
1153 int addr_len = msg->msg_namelen;
1154 int ulen = len;
1155 int hlimit = -1;
1156 int tclass = -1;
1157 int dontfrag = -1;
1158 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
1159 int err;
1160 int connected = 0;
1161 int is_udplite = IS_UDPLITE(sk);
1162 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
1163
1164 /* destination address check */
1165 if (sin6) {
1166 if (addr_len < offsetof(struct sockaddr, sa_data))
1167 return -EINVAL;
1168
1169 switch (sin6->sin6_family) {
1170 case AF_INET6:
1171 if (addr_len < SIN6_LEN_RFC2133)
1172 return -EINVAL;
1173 daddr = &sin6->sin6_addr;
1174 break;
1175 case AF_INET:
1176 goto do_udp_sendmsg;
1177 case AF_UNSPEC:
1178 msg->msg_name = sin6 = NULL;
1179 msg->msg_namelen = addr_len = 0;
1180 daddr = NULL;
1181 break;
1182 default:
1183 return -EINVAL;
1184 }
1185 } else if (!up->pending) {
1186 if (sk->sk_state != TCP_ESTABLISHED)
1187 return -EDESTADDRREQ;
1188 daddr = &sk->sk_v6_daddr;
1189 } else
1190 daddr = NULL;
1191
1192 if (daddr) {
1193 if (ipv6_addr_v4mapped(daddr)) {
1194 struct sockaddr_in sin;
1195 sin.sin_family = AF_INET;
1196 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport;
1197 sin.sin_addr.s_addr = daddr->s6_addr32[3];
1198 msg->msg_name = &sin;
1199 msg->msg_namelen = sizeof(sin);
1200 do_udp_sendmsg:
1201 if (__ipv6_only_sock(sk))
1202 return -ENETUNREACH;
1203 return udp_sendmsg(sk, msg, len);
1204 }
1205 }
1206
1207 if (up->pending == AF_INET)
1208 return udp_sendmsg(sk, msg, len);
1209
1210 /* Rough check on arithmetic overflow,
1211 better check is made in ip6_append_data().
1212 */
1213 if (len > INT_MAX - sizeof(struct udphdr))
1214 return -EMSGSIZE;
1215
1216 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
1217 if (up->pending) {
1218 /*
1219 * There are pending frames.
1220 * The socket lock must be held while it's corked.
1221 */
1222 lock_sock(sk);
1223 if (likely(up->pending)) {
1224 if (unlikely(up->pending != AF_INET6)) {
1225 release_sock(sk);
1226 return -EAFNOSUPPORT;
1227 }
1228 dst = NULL;
1229 goto do_append_data;
1230 }
1231 release_sock(sk);
1232 }
1233 ulen += sizeof(struct udphdr);
1234
1235 memset(&fl6, 0, sizeof(fl6));
1236
1237 if (sin6) {
1238 if (sin6->sin6_port == 0)
1239 return -EINVAL;
1240
1241 fl6.fl6_dport = sin6->sin6_port;
1242 daddr = &sin6->sin6_addr;
1243
1244 if (np->sndflow) {
1245 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
1246 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
1247 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1248 if (!flowlabel)
1249 return -EINVAL;
1250 }
1251 }
1252
1253 /*
1254 * Otherwise it will be difficult to maintain
1255 * sk->sk_dst_cache.
1256 */
1257 if (sk->sk_state == TCP_ESTABLISHED &&
1258 ipv6_addr_equal(daddr, &sk->sk_v6_daddr))
1259 daddr = &sk->sk_v6_daddr;
1260
1261 if (addr_len >= sizeof(struct sockaddr_in6) &&
1262 sin6->sin6_scope_id &&
1263 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
1264 fl6.flowi6_oif = sin6->sin6_scope_id;
1265 } else {
1266 if (sk->sk_state != TCP_ESTABLISHED)
1267 return -EDESTADDRREQ;
1268
1269 fl6.fl6_dport = inet->inet_dport;
1270 daddr = &sk->sk_v6_daddr;
1271 fl6.flowlabel = np->flow_label;
1272 connected = 1;
1273 }
1274
1275 if (!fl6.flowi6_oif)
1276 fl6.flowi6_oif = sk->sk_bound_dev_if;
1277
1278 if (!fl6.flowi6_oif)
1279 fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex;
1280
1281 fl6.flowi6_mark = sk->sk_mark;
1282
1283 if (msg->msg_controllen) {
1284 opt = &opt_space;
1285 memset(opt, 0, sizeof(struct ipv6_txoptions));
1286 opt->tot_len = sizeof(*opt);
1287
1288 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt,
1289 &hlimit, &tclass, &dontfrag);
1290 if (err < 0) {
1291 fl6_sock_release(flowlabel);
1292 return err;
1293 }
1294 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
1295 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1296 if (!flowlabel)
1297 return -EINVAL;
1298 }
1299 if (!(opt->opt_nflen|opt->opt_flen))
1300 opt = NULL;
1301 connected = 0;
1302 }
1303 if (!opt) {
1304 opt = txopt_get(np);
1305 opt_to_free = opt;
1306 }
1307 if (flowlabel)
1308 opt = fl6_merge_options(&opt_space, flowlabel, opt);
1309 opt = ipv6_fixup_options(&opt_space, opt);
1310
1311 fl6.flowi6_proto = sk->sk_protocol;
1312 if (!ipv6_addr_any(daddr))
1313 fl6.daddr = *daddr;
1314 else
1315 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
1316 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
1317 fl6.saddr = np->saddr;
1318 fl6.fl6_sport = inet->inet_sport;
1319
1320 final_p = fl6_update_dst(&fl6, opt, &final);
1321 if (final_p)
1322 connected = 0;
1323
1324 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) {
1325 fl6.flowi6_oif = np->mcast_oif;
1326 connected = 0;
1327 } else if (!fl6.flowi6_oif)
1328 fl6.flowi6_oif = np->ucast_oif;
1329
1330 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
1331
1332 dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p);
1333 if (IS_ERR(dst)) {
1334 err = PTR_ERR(dst);
1335 dst = NULL;
1336 goto out;
1337 }
1338
1339 if (hlimit < 0)
1340 hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
1341
1342 if (tclass < 0)
1343 tclass = np->tclass;
1344
1345 if (msg->msg_flags&MSG_CONFIRM)
1346 goto do_confirm;
1347 back_from_confirm:
1348
1349 /* Lockless fast path for the non-corking case */
1350 if (!corkreq) {
1351 struct sk_buff *skb;
1352
1353 skb = ip6_make_skb(sk, getfrag, msg, ulen,
1354 sizeof(struct udphdr), hlimit, tclass, opt,
1355 &fl6, (struct rt6_info *)dst,
1356 msg->msg_flags, dontfrag);
1357 err = PTR_ERR(skb);
1358 if (!IS_ERR_OR_NULL(skb))
1359 err = udp_v6_send_skb(skb, &fl6);
1360 goto release_dst;
1361 }
1362
1363 lock_sock(sk);
1364 if (unlikely(up->pending)) {
1365 /* The socket is already corked while preparing it. */
1366 /* ... which is an evident application bug. --ANK */
1367 release_sock(sk);
1368
1369 net_dbg_ratelimited("udp cork app bug 2\n");
1370 err = -EINVAL;
1371 goto out;
1372 }
1373
1374 up->pending = AF_INET6;
1375
1376 do_append_data:
1377 if (dontfrag < 0)
1378 dontfrag = np->dontfrag;
1379 up->len += ulen;
1380 err = ip6_append_data(sk, getfrag, msg, ulen,
1381 sizeof(struct udphdr), hlimit, tclass, opt, &fl6,
1382 (struct rt6_info *)dst,
1383 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, dontfrag);
1384 if (err)
1385 udp_v6_flush_pending_frames(sk);
1386 else if (!corkreq)
1387 err = udp_v6_push_pending_frames(sk);
1388 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
1389 up->pending = 0;
1390
1391 if (err > 0)
1392 err = np->recverr ? net_xmit_errno(err) : 0;
1393 release_sock(sk);
1394
1395 release_dst:
1396 if (dst) {
1397 if (connected) {
1398 ip6_dst_store(sk, dst,
1399 ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ?
1400 &sk->sk_v6_daddr : NULL,
1401 #ifdef CONFIG_IPV6_SUBTREES
1402 ipv6_addr_equal(&fl6.saddr, &np->saddr) ?
1403 &np->saddr :
1404 #endif
1405 NULL);
1406 } else {
1407 dst_release(dst);
1408 }
1409 dst = NULL;
1410 }
1411
1412 out:
1413 dst_release(dst);
1414 fl6_sock_release(flowlabel);
1415 txopt_put(opt_to_free);
1416 if (!err)
1417 return len;
1418 /*
1419 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
1420 * ENOBUFS might not be good (it's not tunable per se), but otherwise
1421 * we don't have a good statistic (IpOutDiscards but it can be too many
1422 * things). We could add another new stat but at least for now that
1423 * seems like overkill.
1424 */
1425 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
1426 UDP6_INC_STATS_USER(sock_net(sk),
1427 UDP_MIB_SNDBUFERRORS, is_udplite);
1428 }
1429 return err;
1430
1431 do_confirm:
1432 dst_confirm(dst);
1433 if (!(msg->msg_flags&MSG_PROBE) || len)
1434 goto back_from_confirm;
1435 err = 0;
1436 goto out;
1437 }
1438
1439 void udpv6_destroy_sock(struct sock *sk)
1440 {
1441 struct udp_sock *up = udp_sk(sk);
1442 lock_sock(sk);
1443 udp_v6_flush_pending_frames(sk);
1444 release_sock(sk);
1445
1446 if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
1447 void (*encap_destroy)(struct sock *sk);
1448 encap_destroy = ACCESS_ONCE(up->encap_destroy);
1449 if (encap_destroy)
1450 encap_destroy(sk);
1451 }
1452
1453 inet6_destroy_sock(sk);
1454 }
1455
1456 /*
1457 * Socket option code for UDP
1458 */
1459 int udpv6_setsockopt(struct sock *sk, int level, int optname,
1460 char __user *optval, unsigned int optlen)
1461 {
1462 if (level == SOL_UDP || level == SOL_UDPLITE)
1463 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1464 udp_v6_push_pending_frames);
1465 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1466 }
1467
1468 #ifdef CONFIG_COMPAT
1469 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
1470 char __user *optval, unsigned int optlen)
1471 {
1472 if (level == SOL_UDP || level == SOL_UDPLITE)
1473 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1474 udp_v6_push_pending_frames);
1475 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
1476 }
1477 #endif
1478
1479 int udpv6_getsockopt(struct sock *sk, int level, int optname,
1480 char __user *optval, int __user *optlen)
1481 {
1482 if (level == SOL_UDP || level == SOL_UDPLITE)
1483 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1484 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1485 }
1486
1487 #ifdef CONFIG_COMPAT
1488 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
1489 char __user *optval, int __user *optlen)
1490 {
1491 if (level == SOL_UDP || level == SOL_UDPLITE)
1492 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1493 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
1494 }
1495 #endif
1496
1497 static const struct inet6_protocol udpv6_protocol = {
1498 .handler = udpv6_rcv,
1499 .err_handler = udpv6_err,
1500 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1501 };
1502
1503 /* ------------------------------------------------------------------------ */
1504 #ifdef CONFIG_PROC_FS
1505 int udp6_seq_show(struct seq_file *seq, void *v)
1506 {
1507 if (v == SEQ_START_TOKEN) {
1508 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
1509 } else {
1510 int bucket = ((struct udp_iter_state *)seq->private)->bucket;
1511 struct inet_sock *inet = inet_sk(v);
1512 __u16 srcp = ntohs(inet->inet_sport);
1513 __u16 destp = ntohs(inet->inet_dport);
1514 ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket);
1515 }
1516 return 0;
1517 }
1518
1519 static const struct file_operations udp6_afinfo_seq_fops = {
1520 .owner = THIS_MODULE,
1521 .open = udp_seq_open,
1522 .read = seq_read,
1523 .llseek = seq_lseek,
1524 .release = seq_release_net
1525 };
1526
1527 static struct udp_seq_afinfo udp6_seq_afinfo = {
1528 .name = "udp6",
1529 .family = AF_INET6,
1530 .udp_table = &udp_table,
1531 .seq_fops = &udp6_afinfo_seq_fops,
1532 .seq_ops = {
1533 .show = udp6_seq_show,
1534 },
1535 };
1536
1537 int __net_init udp6_proc_init(struct net *net)
1538 {
1539 return udp_proc_register(net, &udp6_seq_afinfo);
1540 }
1541
1542 void udp6_proc_exit(struct net *net)
1543 {
1544 udp_proc_unregister(net, &udp6_seq_afinfo);
1545 }
1546 #endif /* CONFIG_PROC_FS */
1547
1548 void udp_v6_clear_sk(struct sock *sk, int size)
1549 {
1550 struct inet_sock *inet = inet_sk(sk);
1551
1552 /* we do not want to clear pinet6 field, because of RCU lookups */
1553 sk_prot_clear_portaddr_nulls(sk, offsetof(struct inet_sock, pinet6));
1554
1555 size -= offsetof(struct inet_sock, pinet6) + sizeof(inet->pinet6);
1556 memset(&inet->pinet6 + 1, 0, size);
1557 }
1558
1559 /* ------------------------------------------------------------------------ */
1560
1561 struct proto udpv6_prot = {
1562 .name = "UDPv6",
1563 .owner = THIS_MODULE,
1564 .close = udp_lib_close,
1565 .connect = ip6_datagram_connect,
1566 .disconnect = udp_disconnect,
1567 .ioctl = udp_ioctl,
1568 .destroy = udpv6_destroy_sock,
1569 .setsockopt = udpv6_setsockopt,
1570 .getsockopt = udpv6_getsockopt,
1571 .sendmsg = udpv6_sendmsg,
1572 .recvmsg = udpv6_recvmsg,
1573 .backlog_rcv = __udpv6_queue_rcv_skb,
1574 .hash = udp_lib_hash,
1575 .unhash = udp_lib_unhash,
1576 .rehash = udp_v6_rehash,
1577 .get_port = udp_v6_get_port,
1578 .memory_allocated = &udp_memory_allocated,
1579 .sysctl_mem = sysctl_udp_mem,
1580 .sysctl_wmem = &sysctl_udp_wmem_min,
1581 .sysctl_rmem = &sysctl_udp_rmem_min,
1582 .obj_size = sizeof(struct udp6_sock),
1583 .slab_flags = SLAB_DESTROY_BY_RCU,
1584 .h.udp_table = &udp_table,
1585 #ifdef CONFIG_COMPAT
1586 .compat_setsockopt = compat_udpv6_setsockopt,
1587 .compat_getsockopt = compat_udpv6_getsockopt,
1588 #endif
1589 .clear_sk = udp_v6_clear_sk,
1590 };
1591
1592 static struct inet_protosw udpv6_protosw = {
1593 .type = SOCK_DGRAM,
1594 .protocol = IPPROTO_UDP,
1595 .prot = &udpv6_prot,
1596 .ops = &inet6_dgram_ops,
1597 .flags = INET_PROTOSW_PERMANENT,
1598 };
1599
1600 int __init udpv6_init(void)
1601 {
1602 int ret;
1603
1604 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
1605 if (ret)
1606 goto out;
1607
1608 ret = inet6_register_protosw(&udpv6_protosw);
1609 if (ret)
1610 goto out_udpv6_protocol;
1611 out:
1612 return ret;
1613
1614 out_udpv6_protocol:
1615 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1616 goto out;
1617 }
1618
1619 void udpv6_exit(void)
1620 {
1621 inet6_unregister_protosw(&udpv6_protosw);
1622 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1623 }
Linux kernel - Deliverables
This page took 0.19659 seconds and 5 git commands to generate.