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ASoC: ssm4567: Remove duplicated else-if branch
[linux-2.6/btrfs-unstable.git] / net / ipv6 / udp.c
blob4836af8f582d32d881f8697c1c92b6909e37ab27
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 = -1;
152
153 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum &&
154 sk->sk_family == PF_INET6) {
155 struct inet_sock *inet = inet_sk(sk);
156
157 score = 0;
158 if (inet->inet_dport) {
159 if (inet->inet_dport != sport)
160 return -1;
161 score++;
162 }
163 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
164 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr))
165 return -1;
166 score++;
167 }
168 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
169 if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr))
170 return -1;
171 score++;
172 }
173 if (sk->sk_bound_dev_if) {
174 if (sk->sk_bound_dev_if != dif)
175 return -1;
176 score++;
177 }
178 }
179 return score;
180 }
181
182 #define SCORE2_MAX (1 + 1 + 1)
183 static inline int compute_score2(struct sock *sk, struct net *net,
184 const struct in6_addr *saddr, __be16 sport,
185 const struct in6_addr *daddr, unsigned short hnum,
186 int dif)
187 {
188 int score = -1;
189
190 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum &&
191 sk->sk_family == PF_INET6) {
192 struct inet_sock *inet = inet_sk(sk);
193
194 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr))
195 return -1;
196 score = 0;
197 if (inet->inet_dport) {
198 if (inet->inet_dport != sport)
199 return -1;
200 score++;
201 }
202 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
203 if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr))
204 return -1;
205 score++;
206 }
207 if (sk->sk_bound_dev_if) {
208 if (sk->sk_bound_dev_if != dif)
209 return -1;
210 score++;
211 }
212 }
213 return score;
214 }
215
216
217 /* called with read_rcu_lock() */
218 static struct sock *udp6_lib_lookup2(struct net *net,
219 const struct in6_addr *saddr, __be16 sport,
220 const struct in6_addr *daddr, unsigned int hnum, int dif,
221 struct udp_hslot *hslot2, unsigned int slot2)
222 {
223 struct sock *sk, *result;
224 struct hlist_nulls_node *node;
225 int score, badness, matches = 0, reuseport = 0;
226 u32 hash = 0;
227
228 begin:
229 result = NULL;
230 badness = -1;
231 udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) {
232 score = compute_score2(sk, net, saddr, sport,
233 daddr, hnum, dif);
234 if (score > badness) {
235 result = sk;
236 badness = score;
237 reuseport = sk->sk_reuseport;
238 if (reuseport) {
239 hash = udp6_ehashfn(net, daddr, hnum,
240 saddr, sport);
241 matches = 1;
242 } else if (score == SCORE2_MAX)
243 goto exact_match;
244 } else if (score == badness && reuseport) {
245 matches++;
246 if (((u64)hash * matches) >> 32 == 0)
247 result = sk;
248 hash = next_pseudo_random32(hash);
249 }
250 }
251 /*
252 * if the nulls value we got at the end of this lookup is
253 * not the expected one, we must restart lookup.
254 * We probably met an item that was moved to another chain.
255 */
256 if (get_nulls_value(node) != slot2)
257 goto begin;
258
259 if (result) {
260 exact_match:
261 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
262 result = NULL;
263 else if (unlikely(compute_score2(result, net, saddr, sport,
264 daddr, hnum, dif) < badness)) {
265 sock_put(result);
266 goto begin;
267 }
268 }
269 return result;
270 }
271
272 struct sock *__udp6_lib_lookup(struct net *net,
273 const struct in6_addr *saddr, __be16 sport,
274 const struct in6_addr *daddr, __be16 dport,
275 int dif, struct udp_table *udptable)
276 {
277 struct sock *sk, *result;
278 struct hlist_nulls_node *node;
279 unsigned short hnum = ntohs(dport);
280 unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask);
281 struct udp_hslot *hslot2, *hslot = &udptable->hash[slot];
282 int score, badness, matches = 0, reuseport = 0;
283 u32 hash = 0;
284
285 rcu_read_lock();
286 if (hslot->count > 10) {
287 hash2 = udp6_portaddr_hash(net, daddr, hnum);
288 slot2 = hash2 & udptable->mask;
289 hslot2 = &udptable->hash2[slot2];
290 if (hslot->count < hslot2->count)
291 goto begin;
292
293 result = udp6_lib_lookup2(net, saddr, sport,
294 daddr, hnum, dif,
295 hslot2, slot2);
296 if (!result) {
297 hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum);
298 slot2 = hash2 & udptable->mask;
299 hslot2 = &udptable->hash2[slot2];
300 if (hslot->count < hslot2->count)
301 goto begin;
302
303 result = udp6_lib_lookup2(net, saddr, sport,
304 &in6addr_any, hnum, dif,
305 hslot2, slot2);
306 }
307 rcu_read_unlock();
308 return result;
309 }
310 begin:
311 result = NULL;
312 badness = -1;
313 sk_nulls_for_each_rcu(sk, node, &hslot->head) {
314 score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif);
315 if (score > badness) {
316 result = sk;
317 badness = score;
318 reuseport = sk->sk_reuseport;
319 if (reuseport) {
320 hash = udp6_ehashfn(net, daddr, hnum,
321 saddr, sport);
322 matches = 1;
323 }
324 } else if (score == badness && reuseport) {
325 matches++;
326 if (((u64)hash * matches) >> 32 == 0)
327 result = sk;
328 hash = next_pseudo_random32(hash);
329 }
330 }
331 /*
332 * if the nulls value we got at the end of this lookup is
333 * not the expected one, we must restart lookup.
334 * We probably met an item that was moved to another chain.
335 */
336 if (get_nulls_value(node) != slot)
337 goto begin;
338
339 if (result) {
340 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
341 result = NULL;
342 else if (unlikely(compute_score(result, net, hnum, saddr, sport,
343 daddr, dport, dif) < badness)) {
344 sock_put(result);
345 goto begin;
346 }
347 }
348 rcu_read_unlock();
349 return result;
350 }
351 EXPORT_SYMBOL_GPL(__udp6_lib_lookup);
352
353 static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb,
354 __be16 sport, __be16 dport,
355 struct udp_table *udptable)
356 {
357 struct sock *sk;
358 const struct ipv6hdr *iph = ipv6_hdr(skb);
359
360 if (unlikely(sk = skb_steal_sock(skb)))
361 return sk;
362 return __udp6_lib_lookup(dev_net(skb_dst(skb)->dev), &iph->saddr, sport,
363 &iph->daddr, dport, inet6_iif(skb),
364 udptable);
365 }
366
367 struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport,
368 const struct in6_addr *daddr, __be16 dport, int dif)
369 {
370 return __udp6_lib_lookup(net, saddr, sport, daddr, dport, dif, &udp_table);
371 }
372 EXPORT_SYMBOL_GPL(udp6_lib_lookup);
373
374
375 /*
376 * This should be easy, if there is something there we
377 * return it, otherwise we block.
378 */
379
380 int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
381 struct msghdr *msg, size_t len,
382 int noblock, int flags, int *addr_len)
383 {
384 struct ipv6_pinfo *np = inet6_sk(sk);
385 struct inet_sock *inet = inet_sk(sk);
386 struct sk_buff *skb;
387 unsigned int ulen, copied;
388 int peeked, off = 0;
389 int err;
390 int is_udplite = IS_UDPLITE(sk);
391 int is_udp4;
392 bool slow;
393
394 if (flags & MSG_ERRQUEUE)
395 return ipv6_recv_error(sk, msg, len, addr_len);
396
397 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
398 return ipv6_recv_rxpmtu(sk, msg, len, addr_len);
399
400 try_again:
401 skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),
402 &peeked, &off, &err);
403 if (!skb)
404 goto out;
405
406 ulen = skb->len - sizeof(struct udphdr);
407 copied = len;
408 if (copied > ulen)
409 copied = ulen;
410 else if (copied < ulen)
411 msg->msg_flags |= MSG_TRUNC;
412
413 is_udp4 = (skb->protocol == htons(ETH_P_IP));
414
415 /*
416 * If checksum is needed at all, try to do it while copying the
417 * data. If the data is truncated, or if we only want a partial
418 * coverage checksum (UDP-Lite), do it before the copy.
419 */
420
421 if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) {
422 if (udp_lib_checksum_complete(skb))
423 goto csum_copy_err;
424 }
425
426 if (skb_csum_unnecessary(skb))
427 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr),
428 msg->msg_iov, copied);
429 else {
430 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
431 if (err == -EINVAL)
432 goto csum_copy_err;
433 }
434 if (unlikely(err)) {
435 trace_kfree_skb(skb, udpv6_recvmsg);
436 if (!peeked) {
437 atomic_inc(&sk->sk_drops);
438 if (is_udp4)
439 UDP_INC_STATS_USER(sock_net(sk),
440 UDP_MIB_INERRORS,
441 is_udplite);
442 else
443 UDP6_INC_STATS_USER(sock_net(sk),
444 UDP_MIB_INERRORS,
445 is_udplite);
446 }
447 goto out_free;
448 }
449 if (!peeked) {
450 if (is_udp4)
451 UDP_INC_STATS_USER(sock_net(sk),
452 UDP_MIB_INDATAGRAMS, is_udplite);
453 else
454 UDP6_INC_STATS_USER(sock_net(sk),
455 UDP_MIB_INDATAGRAMS, is_udplite);
456 }
457
458 sock_recv_ts_and_drops(msg, sk, skb);
459
460 /* Copy the address. */
461 if (msg->msg_name) {
462 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
463 sin6->sin6_family = AF_INET6;
464 sin6->sin6_port = udp_hdr(skb)->source;
465 sin6->sin6_flowinfo = 0;
466
467 if (is_udp4) {
468 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
469 &sin6->sin6_addr);
470 sin6->sin6_scope_id = 0;
471 } else {
472 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
473 sin6->sin6_scope_id =
474 ipv6_iface_scope_id(&sin6->sin6_addr,
475 inet6_iif(skb));
476 }
477 *addr_len = sizeof(*sin6);
478 }
479
480 if (np->rxopt.all)
481 ip6_datagram_recv_common_ctl(sk, msg, skb);
482
483 if (is_udp4) {
484 if (inet->cmsg_flags)
485 ip_cmsg_recv(msg, skb);
486 } else {
487 if (np->rxopt.all)
488 ip6_datagram_recv_specific_ctl(sk, msg, skb);
489 }
490
491 err = copied;
492 if (flags & MSG_TRUNC)
493 err = ulen;
494
495 out_free:
496 skb_free_datagram_locked(sk, skb);
497 out:
498 return err;
499
500 csum_copy_err:
501 slow = lock_sock_fast(sk);
502 if (!skb_kill_datagram(sk, skb, flags)) {
503 if (is_udp4) {
504 UDP_INC_STATS_USER(sock_net(sk),
505 UDP_MIB_CSUMERRORS, is_udplite);
506 UDP_INC_STATS_USER(sock_net(sk),
507 UDP_MIB_INERRORS, is_udplite);
508 } else {
509 UDP6_INC_STATS_USER(sock_net(sk),
510 UDP_MIB_CSUMERRORS, is_udplite);
511 UDP6_INC_STATS_USER(sock_net(sk),
512 UDP_MIB_INERRORS, is_udplite);
513 }
514 }
515 unlock_sock_fast(sk, slow);
516
517 if (noblock)
518 return -EAGAIN;
519
520 /* starting over for a new packet */
521 msg->msg_flags &= ~MSG_TRUNC;
522 goto try_again;
523 }
524
525 void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
526 u8 type, u8 code, int offset, __be32 info,
527 struct udp_table *udptable)
528 {
529 struct ipv6_pinfo *np;
530 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
531 const struct in6_addr *saddr = &hdr->saddr;
532 const struct in6_addr *daddr = &hdr->daddr;
533 struct udphdr *uh = (struct udphdr*)(skb->data+offset);
534 struct sock *sk;
535 int err;
536 struct net *net = dev_net(skb->dev);
537
538 sk = __udp6_lib_lookup(net, daddr, uh->dest,
539 saddr, uh->source, inet6_iif(skb), udptable);
540 if (sk == NULL) {
541 ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev),
542 ICMP6_MIB_INERRORS);
543 return;
544 }
545
546 if (type == ICMPV6_PKT_TOOBIG) {
547 if (!ip6_sk_accept_pmtu(sk))
548 goto out;
549 ip6_sk_update_pmtu(skb, sk, info);
550 }
551 if (type == NDISC_REDIRECT) {
552 ip6_sk_redirect(skb, sk);
553 goto out;
554 }
555
556 np = inet6_sk(sk);
557
558 if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
559 goto out;
560
561 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
562 goto out;
563
564 if (np->recverr)
565 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
566
567 sk->sk_err = err;
568 sk->sk_error_report(sk);
569 out:
570 sock_put(sk);
571 }
572
573 static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
574 {
575 int rc;
576
577 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
578 sock_rps_save_rxhash(sk, skb);
579 sk_mark_napi_id(sk, skb);
580 }
581
582 rc = sock_queue_rcv_skb(sk, skb);
583 if (rc < 0) {
584 int is_udplite = IS_UDPLITE(sk);
585
586 /* Note that an ENOMEM error is charged twice */
587 if (rc == -ENOMEM)
588 UDP6_INC_STATS_BH(sock_net(sk),
589 UDP_MIB_RCVBUFERRORS, is_udplite);
590 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
591 kfree_skb(skb);
592 return -1;
593 }
594 return 0;
595 }
596
597 static __inline__ void udpv6_err(struct sk_buff *skb,
598 struct inet6_skb_parm *opt, u8 type,
599 u8 code, int offset, __be32 info )
600 {
601 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table);
602 }
603
604 static struct static_key udpv6_encap_needed __read_mostly;
605 void udpv6_encap_enable(void)
606 {
607 if (!static_key_enabled(&udpv6_encap_needed))
608 static_key_slow_inc(&udpv6_encap_needed);
609 }
610 EXPORT_SYMBOL(udpv6_encap_enable);
611
612 int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
613 {
614 struct udp_sock *up = udp_sk(sk);
615 int rc;
616 int is_udplite = IS_UDPLITE(sk);
617
618 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
619 goto drop;
620
621 if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
622 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
623
624 /*
625 * This is an encapsulation socket so pass the skb to
626 * the socket's udp_encap_rcv() hook. Otherwise, just
627 * fall through and pass this up the UDP socket.
628 * up->encap_rcv() returns the following value:
629 * =0 if skb was successfully passed to the encap
630 * handler or was discarded by it.
631 * >0 if skb should be passed on to UDP.
632 * <0 if skb should be resubmitted as proto -N
633 */
634
635 /* if we're overly short, let UDP handle it */
636 encap_rcv = ACCESS_ONCE(up->encap_rcv);
637 if (skb->len > sizeof(struct udphdr) && encap_rcv != NULL) {
638 int ret;
639
640 /* Verify checksum before giving to encap */
641 if (udp_lib_checksum_complete(skb))
642 goto csum_error;
643
644 ret = encap_rcv(sk, skb);
645 if (ret <= 0) {
646 UDP_INC_STATS_BH(sock_net(sk),
647 UDP_MIB_INDATAGRAMS,
648 is_udplite);
649 return -ret;
650 }
651 }
652
653 /* FALLTHROUGH -- it's a UDP Packet */
654 }
655
656 /*
657 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
658 */
659 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
660
661 if (up->pcrlen == 0) { /* full coverage was set */
662 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage"
663 " %d while full coverage %d requested\n",
664 UDP_SKB_CB(skb)->cscov, skb->len);
665 goto drop;
666 }
667 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
668 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d "
669 "too small, need min %d\n",
670 UDP_SKB_CB(skb)->cscov, up->pcrlen);
671 goto drop;
672 }
673 }
674
675 if (rcu_access_pointer(sk->sk_filter)) {
676 if (udp_lib_checksum_complete(skb))
677 goto csum_error;
678 }
679
680 if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
681 UDP6_INC_STATS_BH(sock_net(sk),
682 UDP_MIB_RCVBUFERRORS, is_udplite);
683 goto drop;
684 }
685
686 skb_dst_drop(skb);
687
688 bh_lock_sock(sk);
689 rc = 0;
690 if (!sock_owned_by_user(sk))
691 rc = __udpv6_queue_rcv_skb(sk, skb);
692 else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
693 bh_unlock_sock(sk);
694 goto drop;
695 }
696 bh_unlock_sock(sk);
697
698 return rc;
699
700 csum_error:
701 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite);
702 drop:
703 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
704 atomic_inc(&sk->sk_drops);
705 kfree_skb(skb);
706 return -1;
707 }
708
709 static bool __udp_v6_is_mcast_sock(struct net *net, struct sock *sk,
710 __be16 loc_port, const struct in6_addr *loc_addr,
711 __be16 rmt_port, const struct in6_addr *rmt_addr,
712 int dif, unsigned short hnum)
713 {
714 struct inet_sock *inet = inet_sk(sk);
715
716 if (!net_eq(sock_net(sk), net))
717 return false;
718
719 if (udp_sk(sk)->udp_port_hash != hnum ||
720 sk->sk_family != PF_INET6 ||
721 (inet->inet_dport && inet->inet_dport != rmt_port) ||
722 (!ipv6_addr_any(&sk->sk_v6_daddr) &&
723 !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) ||
724 (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif))
725 return false;
726 if (!inet6_mc_check(sk, loc_addr, rmt_addr))
727 return false;
728 return true;
729 }
730
731 static void flush_stack(struct sock **stack, unsigned int count,
732 struct sk_buff *skb, unsigned int final)
733 {
734 struct sk_buff *skb1 = NULL;
735 struct sock *sk;
736 unsigned int i;
737
738 for (i = 0; i < count; i++) {
739 sk = stack[i];
740 if (likely(skb1 == NULL))
741 skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC);
742 if (!skb1) {
743 atomic_inc(&sk->sk_drops);
744 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS,
745 IS_UDPLITE(sk));
746 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS,
747 IS_UDPLITE(sk));
748 }
749
750 if (skb1 && udpv6_queue_rcv_skb(sk, skb1) <= 0)
751 skb1 = NULL;
752 sock_put(sk);
753 }
754 if (unlikely(skb1))
755 kfree_skb(skb1);
756 }
757
758 static void udp6_csum_zero_error(struct sk_buff *skb)
759 {
760 /* RFC 2460 section 8.1 says that we SHOULD log
761 * this error. Well, it is reasonable.
762 */
763 LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n",
764 &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source),
765 &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest));
766 }
767
768 /*
769 * Note: called only from the BH handler context,
770 * so we don't need to lock the hashes.
771 */
772 static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
773 const struct in6_addr *saddr, const struct in6_addr *daddr,
774 struct udp_table *udptable)
775 {
776 struct sock *sk, *stack[256 / sizeof(struct sock *)];
777 const struct udphdr *uh = udp_hdr(skb);
778 struct hlist_nulls_node *node;
779 unsigned short hnum = ntohs(uh->dest);
780 struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum);
781 int dif = inet6_iif(skb);
782 unsigned int count = 0, offset = offsetof(typeof(*sk), sk_nulls_node);
783 unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10);
784
785 if (use_hash2) {
786 hash2_any = udp6_portaddr_hash(net, &in6addr_any, hnum) &
787 udp_table.mask;
788 hash2 = udp6_portaddr_hash(net, daddr, hnum) & udp_table.mask;
789 start_lookup:
790 hslot = &udp_table.hash2[hash2];
791 offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node);
792 }
793
794 spin_lock(&hslot->lock);
795 sk_nulls_for_each_entry_offset(sk, node, &hslot->head, offset) {
796 if (__udp_v6_is_mcast_sock(net, sk,
797 uh->dest, daddr,
798 uh->source, saddr,
799 dif, hnum) &&
800 /* If zero checksum and no_check is not on for
801 * the socket then skip it.
802 */
803 (uh->check || udp_sk(sk)->no_check6_rx)) {
804 if (unlikely(count == ARRAY_SIZE(stack))) {
805 flush_stack(stack, count, skb, ~0);
806 count = 0;
807 }
808 stack[count++] = sk;
809 sock_hold(sk);
810 }
811 }
812
813 spin_unlock(&hslot->lock);
814
815 /* Also lookup *:port if we are using hash2 and haven't done so yet. */
816 if (use_hash2 && hash2 != hash2_any) {
817 hash2 = hash2_any;
818 goto start_lookup;
819 }
820
821 if (count) {
822 flush_stack(stack, count, skb, count - 1);
823 } else {
824 kfree_skb(skb);
825 }
826 return 0;
827 }
828
829 int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
830 int proto)
831 {
832 struct net *net = dev_net(skb->dev);
833 struct sock *sk;
834 struct udphdr *uh;
835 const struct in6_addr *saddr, *daddr;
836 u32 ulen = 0;
837
838 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
839 goto discard;
840
841 saddr = &ipv6_hdr(skb)->saddr;
842 daddr = &ipv6_hdr(skb)->daddr;
843 uh = udp_hdr(skb);
844
845 ulen = ntohs(uh->len);
846 if (ulen > skb->len)
847 goto short_packet;
848
849 if (proto == IPPROTO_UDP) {
850 /* UDP validates ulen. */
851
852 /* Check for jumbo payload */
853 if (ulen == 0)
854 ulen = skb->len;
855
856 if (ulen < sizeof(*uh))
857 goto short_packet;
858
859 if (ulen < skb->len) {
860 if (pskb_trim_rcsum(skb, ulen))
861 goto short_packet;
862 saddr = &ipv6_hdr(skb)->saddr;
863 daddr = &ipv6_hdr(skb)->daddr;
864 uh = udp_hdr(skb);
865 }
866 }
867
868 if (udp6_csum_init(skb, uh, proto))
869 goto csum_error;
870
871 /*
872 * Multicast receive code
873 */
874 if (ipv6_addr_is_multicast(daddr))
875 return __udp6_lib_mcast_deliver(net, skb,
876 saddr, daddr, udptable);
877
878 /* Unicast */
879
880 /*
881 * check socket cache ... must talk to Alan about his plans
882 * for sock caches... i'll skip this for now.
883 */
884 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
885 if (sk != NULL) {
886 int ret;
887
888 if (!uh->check && !udp_sk(sk)->no_check6_rx) {
889 sock_put(sk);
890 udp6_csum_zero_error(skb);
891 goto csum_error;
892 }
893
894 ret = udpv6_queue_rcv_skb(sk, skb);
895 sock_put(sk);
896
897 /* a return value > 0 means to resubmit the input, but
898 * it wants the return to be -protocol, or 0
899 */
900 if (ret > 0)
901 return -ret;
902
903 return 0;
904 }
905
906 if (!uh->check) {
907 udp6_csum_zero_error(skb);
908 goto csum_error;
909 }
910
911 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
912 goto discard;
913
914 if (udp_lib_checksum_complete(skb))
915 goto csum_error;
916
917 UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
918 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
919
920 kfree_skb(skb);
921 return 0;
922
923 short_packet:
924 LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n",
925 proto == IPPROTO_UDPLITE ? "-Lite" : "",
926 saddr,
927 ntohs(uh->source),
928 ulen,
929 skb->len,
930 daddr,
931 ntohs(uh->dest));
932 goto discard;
933 csum_error:
934 UDP6_INC_STATS_BH(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE);
935 discard:
936 UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
937 kfree_skb(skb);
938 return 0;
939 }
940
941 static __inline__ int udpv6_rcv(struct sk_buff *skb)
942 {
943 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP);
944 }
945
946 /*
947 * Throw away all pending data and cancel the corking. Socket is locked.
948 */
949 static void udp_v6_flush_pending_frames(struct sock *sk)
950 {
951 struct udp_sock *up = udp_sk(sk);
952
953 if (up->pending == AF_INET)
954 udp_flush_pending_frames(sk);
955 else if (up->pending) {
956 up->len = 0;
957 up->pending = 0;
958 ip6_flush_pending_frames(sk);
959 }
960 }
961
962 /**
963 * udp6_hwcsum_outgoing - handle outgoing HW checksumming
964 * @sk: socket we are sending on
965 * @skb: sk_buff containing the filled-in UDP header
966 * (checksum field must be zeroed out)
967 */
968 static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
969 const struct in6_addr *saddr,
970 const struct in6_addr *daddr, int len)
971 {
972 unsigned int offset;
973 struct udphdr *uh = udp_hdr(skb);
974 __wsum csum = 0;
975
976 if (skb_queue_len(&sk->sk_write_queue) == 1) {
977 /* Only one fragment on the socket. */
978 skb->csum_start = skb_transport_header(skb) - skb->head;
979 skb->csum_offset = offsetof(struct udphdr, check);
980 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0);
981 } else {
982 /*
983 * HW-checksum won't work as there are two or more
984 * fragments on the socket so that all csums of sk_buffs
985 * should be together
986 */
987 offset = skb_transport_offset(skb);
988 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
989
990 skb->ip_summed = CHECKSUM_NONE;
991
992 skb_queue_walk(&sk->sk_write_queue, skb) {
993 csum = csum_add(csum, skb->csum);
994 }
995
996 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP,
997 csum);
998 if (uh->check == 0)
999 uh->check = CSUM_MANGLED_0;
1000 }
1001 }
1002
1003 /*
1004 * Sending
1005 */
1006
1007 static int udp_v6_push_pending_frames(struct sock *sk)
1008 {
1009 struct sk_buff *skb;
1010 struct udphdr *uh;
1011 struct udp_sock *up = udp_sk(sk);
1012 struct inet_sock *inet = inet_sk(sk);
1013 struct flowi6 *fl6;
1014 int err = 0;
1015 int is_udplite = IS_UDPLITE(sk);
1016 __wsum csum = 0;
1017
1018 if (up->pending == AF_INET)
1019 return udp_push_pending_frames(sk);
1020
1021 fl6 = &inet->cork.fl.u.ip6;
1022
1023 /* Grab the skbuff where UDP header space exists. */
1024 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
1025 goto out;
1026
1027 /*
1028 * Create a UDP header
1029 */
1030 uh = udp_hdr(skb);
1031 uh->source = fl6->fl6_sport;
1032 uh->dest = fl6->fl6_dport;
1033 uh->len = htons(up->len);
1034 uh->check = 0;
1035
1036 if (is_udplite)
1037 csum = udplite_csum_outgoing(sk, skb);
1038 else if (up->no_check6_tx) { /* UDP csum disabled */
1039 skb->ip_summed = CHECKSUM_NONE;
1040 goto send;
1041 } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
1042 udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr,
1043 up->len);
1044 goto send;
1045 } else
1046 csum = udp_csum_outgoing(sk, skb);
1047
1048 /* add protocol-dependent pseudo-header */
1049 uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
1050 up->len, fl6->flowi6_proto, csum);
1051 if (uh->check == 0)
1052 uh->check = CSUM_MANGLED_0;
1053
1054 send:
1055 err = ip6_push_pending_frames(sk);
1056 if (err) {
1057 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) {
1058 UDP6_INC_STATS_USER(sock_net(sk),
1059 UDP_MIB_SNDBUFERRORS, is_udplite);
1060 err = 0;
1061 }
1062 } else
1063 UDP6_INC_STATS_USER(sock_net(sk),
1064 UDP_MIB_OUTDATAGRAMS, is_udplite);
1065 out:
1066 up->len = 0;
1067 up->pending = 0;
1068 return err;
1069 }
1070
1071 int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
1072 struct msghdr *msg, size_t len)
1073 {
1074 struct ipv6_txoptions opt_space;
1075 struct udp_sock *up = udp_sk(sk);
1076 struct inet_sock *inet = inet_sk(sk);
1077 struct ipv6_pinfo *np = inet6_sk(sk);
1078 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
1079 struct in6_addr *daddr, *final_p, final;
1080 struct ipv6_txoptions *opt = NULL;
1081 struct ip6_flowlabel *flowlabel = NULL;
1082 struct flowi6 fl6;
1083 struct dst_entry *dst;
1084 int addr_len = msg->msg_namelen;
1085 int ulen = len;
1086 int hlimit = -1;
1087 int tclass = -1;
1088 int dontfrag = -1;
1089 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
1090 int err;
1091 int connected = 0;
1092 int is_udplite = IS_UDPLITE(sk);
1093 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
1094
1095 /* destination address check */
1096 if (sin6) {
1097 if (addr_len < offsetof(struct sockaddr, sa_data))
1098 return -EINVAL;
1099
1100 switch (sin6->sin6_family) {
1101 case AF_INET6:
1102 if (addr_len < SIN6_LEN_RFC2133)
1103 return -EINVAL;
1104 daddr = &sin6->sin6_addr;
1105 break;
1106 case AF_INET:
1107 goto do_udp_sendmsg;
1108 case AF_UNSPEC:
1109 msg->msg_name = sin6 = NULL;
1110 msg->msg_namelen = addr_len = 0;
1111 daddr = NULL;
1112 break;
1113 default:
1114 return -EINVAL;
1115 }
1116 } else if (!up->pending) {
1117 if (sk->sk_state != TCP_ESTABLISHED)
1118 return -EDESTADDRREQ;
1119 daddr = &sk->sk_v6_daddr;
1120 } else
1121 daddr = NULL;
1122
1123 if (daddr) {
1124 if (ipv6_addr_v4mapped(daddr)) {
1125 struct sockaddr_in sin;
1126 sin.sin_family = AF_INET;
1127 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport;
1128 sin.sin_addr.s_addr = daddr->s6_addr32[3];
1129 msg->msg_name = &sin;
1130 msg->msg_namelen = sizeof(sin);
1131 do_udp_sendmsg:
1132 if (__ipv6_only_sock(sk))
1133 return -ENETUNREACH;
1134 return udp_sendmsg(iocb, sk, msg, len);
1135 }
1136 }
1137
1138 if (up->pending == AF_INET)
1139 return udp_sendmsg(iocb, sk, msg, len);
1140
1141 /* Rough check on arithmetic overflow,
1142 better check is made in ip6_append_data().
1143 */
1144 if (len > INT_MAX - sizeof(struct udphdr))
1145 return -EMSGSIZE;
1146
1147 if (up->pending) {
1148 /*
1149 * There are pending frames.
1150 * The socket lock must be held while it's corked.
1151 */
1152 lock_sock(sk);
1153 if (likely(up->pending)) {
1154 if (unlikely(up->pending != AF_INET6)) {
1155 release_sock(sk);
1156 return -EAFNOSUPPORT;
1157 }
1158 dst = NULL;
1159 goto do_append_data;
1160 }
1161 release_sock(sk);
1162 }
1163 ulen += sizeof(struct udphdr);
1164
1165 memset(&fl6, 0, sizeof(fl6));
1166
1167 if (sin6) {
1168 if (sin6->sin6_port == 0)
1169 return -EINVAL;
1170
1171 fl6.fl6_dport = sin6->sin6_port;
1172 daddr = &sin6->sin6_addr;
1173
1174 if (np->sndflow) {
1175 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
1176 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
1177 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1178 if (flowlabel == NULL)
1179 return -EINVAL;
1180 }
1181 }
1182
1183 /*
1184 * Otherwise it will be difficult to maintain
1185 * sk->sk_dst_cache.
1186 */
1187 if (sk->sk_state == TCP_ESTABLISHED &&
1188 ipv6_addr_equal(daddr, &sk->sk_v6_daddr))
1189 daddr = &sk->sk_v6_daddr;
1190
1191 if (addr_len >= sizeof(struct sockaddr_in6) &&
1192 sin6->sin6_scope_id &&
1193 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
1194 fl6.flowi6_oif = sin6->sin6_scope_id;
1195 } else {
1196 if (sk->sk_state != TCP_ESTABLISHED)
1197 return -EDESTADDRREQ;
1198
1199 fl6.fl6_dport = inet->inet_dport;
1200 daddr = &sk->sk_v6_daddr;
1201 fl6.flowlabel = np->flow_label;
1202 connected = 1;
1203 }
1204
1205 if (!fl6.flowi6_oif)
1206 fl6.flowi6_oif = sk->sk_bound_dev_if;
1207
1208 if (!fl6.flowi6_oif)
1209 fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex;
1210
1211 fl6.flowi6_mark = sk->sk_mark;
1212
1213 if (msg->msg_controllen) {
1214 opt = &opt_space;
1215 memset(opt, 0, sizeof(struct ipv6_txoptions));
1216 opt->tot_len = sizeof(*opt);
1217
1218 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt,
1219 &hlimit, &tclass, &dontfrag);
1220 if (err < 0) {
1221 fl6_sock_release(flowlabel);
1222 return err;
1223 }
1224 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
1225 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1226 if (flowlabel == NULL)
1227 return -EINVAL;
1228 }
1229 if (!(opt->opt_nflen|opt->opt_flen))
1230 opt = NULL;
1231 connected = 0;
1232 }
1233 if (opt == NULL)
1234 opt = np->opt;
1235 if (flowlabel)
1236 opt = fl6_merge_options(&opt_space, flowlabel, opt);
1237 opt = ipv6_fixup_options(&opt_space, opt);
1238
1239 fl6.flowi6_proto = sk->sk_protocol;
1240 if (!ipv6_addr_any(daddr))
1241 fl6.daddr = *daddr;
1242 else
1243 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
1244 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
1245 fl6.saddr = np->saddr;
1246 fl6.fl6_sport = inet->inet_sport;
1247
1248 final_p = fl6_update_dst(&fl6, opt, &final);
1249 if (final_p)
1250 connected = 0;
1251
1252 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) {
1253 fl6.flowi6_oif = np->mcast_oif;
1254 connected = 0;
1255 } else if (!fl6.flowi6_oif)
1256 fl6.flowi6_oif = np->ucast_oif;
1257
1258 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
1259
1260 dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p);
1261 if (IS_ERR(dst)) {
1262 err = PTR_ERR(dst);
1263 dst = NULL;
1264 goto out;
1265 }
1266
1267 if (hlimit < 0)
1268 hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
1269
1270 if (tclass < 0)
1271 tclass = np->tclass;
1272
1273 if (msg->msg_flags&MSG_CONFIRM)
1274 goto do_confirm;
1275 back_from_confirm:
1276
1277 lock_sock(sk);
1278 if (unlikely(up->pending)) {
1279 /* The socket is already corked while preparing it. */
1280 /* ... which is an evident application bug. --ANK */
1281 release_sock(sk);
1282
1283 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
1284 err = -EINVAL;
1285 goto out;
1286 }
1287
1288 up->pending = AF_INET6;
1289
1290 do_append_data:
1291 if (dontfrag < 0)
1292 dontfrag = np->dontfrag;
1293 up->len += ulen;
1294 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
1295 err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen,
1296 sizeof(struct udphdr), hlimit, tclass, opt, &fl6,
1297 (struct rt6_info*)dst,
1298 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, dontfrag);
1299 if (err)
1300 udp_v6_flush_pending_frames(sk);
1301 else if (!corkreq)
1302 err = udp_v6_push_pending_frames(sk);
1303 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
1304 up->pending = 0;
1305
1306 if (dst) {
1307 if (connected) {
1308 ip6_dst_store(sk, dst,
1309 ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ?
1310 &sk->sk_v6_daddr : NULL,
1311 #ifdef CONFIG_IPV6_SUBTREES
1312 ipv6_addr_equal(&fl6.saddr, &np->saddr) ?
1313 &np->saddr :
1314 #endif
1315 NULL);
1316 } else {
1317 dst_release(dst);
1318 }
1319 dst = NULL;
1320 }
1321
1322 if (err > 0)
1323 err = np->recverr ? net_xmit_errno(err) : 0;
1324 release_sock(sk);
1325 out:
1326 dst_release(dst);
1327 fl6_sock_release(flowlabel);
1328 if (!err)
1329 return len;
1330 /*
1331 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
1332 * ENOBUFS might not be good (it's not tunable per se), but otherwise
1333 * we don't have a good statistic (IpOutDiscards but it can be too many
1334 * things). We could add another new stat but at least for now that
1335 * seems like overkill.
1336 */
1337 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
1338 UDP6_INC_STATS_USER(sock_net(sk),
1339 UDP_MIB_SNDBUFERRORS, is_udplite);
1340 }
1341 return err;
1342
1343 do_confirm:
1344 dst_confirm(dst);
1345 if (!(msg->msg_flags&MSG_PROBE) || len)
1346 goto back_from_confirm;
1347 err = 0;
1348 goto out;
1349 }
1350
1351 void udpv6_destroy_sock(struct sock *sk)
1352 {
1353 struct udp_sock *up = udp_sk(sk);
1354 lock_sock(sk);
1355 udp_v6_flush_pending_frames(sk);
1356 release_sock(sk);
1357
1358 if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
1359 void (*encap_destroy)(struct sock *sk);
1360 encap_destroy = ACCESS_ONCE(up->encap_destroy);
1361 if (encap_destroy)
1362 encap_destroy(sk);
1363 }
1364
1365 inet6_destroy_sock(sk);
1366 }
1367
1368 /*
1369 * Socket option code for UDP
1370 */
1371 int udpv6_setsockopt(struct sock *sk, int level, int optname,
1372 char __user *optval, unsigned int optlen)
1373 {
1374 if (level == SOL_UDP || level == SOL_UDPLITE)
1375 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1376 udp_v6_push_pending_frames);
1377 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1378 }
1379
1380 #ifdef CONFIG_COMPAT
1381 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
1382 char __user *optval, unsigned int optlen)
1383 {
1384 if (level == SOL_UDP || level == SOL_UDPLITE)
1385 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1386 udp_v6_push_pending_frames);
1387 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
1388 }
1389 #endif
1390
1391 int udpv6_getsockopt(struct sock *sk, int level, int optname,
1392 char __user *optval, int __user *optlen)
1393 {
1394 if (level == SOL_UDP || level == SOL_UDPLITE)
1395 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1396 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1397 }
1398
1399 #ifdef CONFIG_COMPAT
1400 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
1401 char __user *optval, int __user *optlen)
1402 {
1403 if (level == SOL_UDP || level == SOL_UDPLITE)
1404 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1405 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
1406 }
1407 #endif
1408
1409 static const struct inet6_protocol udpv6_protocol = {
1410 .handler = udpv6_rcv,
1411 .err_handler = udpv6_err,
1412 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1413 };
1414
1415 /* ------------------------------------------------------------------------ */
1416 #ifdef CONFIG_PROC_FS
1417 int udp6_seq_show(struct seq_file *seq, void *v)
1418 {
1419 if (v == SEQ_START_TOKEN) {
1420 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
1421 } else {
1422 int bucket = ((struct udp_iter_state *)seq->private)->bucket;
1423 struct inet_sock *inet = inet_sk(v);
1424 __u16 srcp = ntohs(inet->inet_sport);
1425 __u16 destp = ntohs(inet->inet_dport);
1426 ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket);
1427 }
1428 return 0;
1429 }
1430
1431 static const struct file_operations udp6_afinfo_seq_fops = {
1432 .owner = THIS_MODULE,
1433 .open = udp_seq_open,
1434 .read = seq_read,
1435 .llseek = seq_lseek,
1436 .release = seq_release_net
1437 };
1438
1439 static struct udp_seq_afinfo udp6_seq_afinfo = {
1440 .name = "udp6",
1441 .family = AF_INET6,
1442 .udp_table = &udp_table,
1443 .seq_fops = &udp6_afinfo_seq_fops,
1444 .seq_ops = {
1445 .show = udp6_seq_show,
1446 },
1447 };
1448
1449 int __net_init udp6_proc_init(struct net *net)
1450 {
1451 return udp_proc_register(net, &udp6_seq_afinfo);
1452 }
1453
1454 void udp6_proc_exit(struct net *net) {
1455 udp_proc_unregister(net, &udp6_seq_afinfo);
1456 }
1457 #endif /* CONFIG_PROC_FS */
1458
1459 void udp_v6_clear_sk(struct sock *sk, int size)
1460 {
1461 struct inet_sock *inet = inet_sk(sk);
1462
1463 /* we do not want to clear pinet6 field, because of RCU lookups */
1464 sk_prot_clear_portaddr_nulls(sk, offsetof(struct inet_sock, pinet6));
1465
1466 size -= offsetof(struct inet_sock, pinet6) + sizeof(inet->pinet6);
1467 memset(&inet->pinet6 + 1, 0, size);
1468 }
1469
1470 /* ------------------------------------------------------------------------ */
1471
1472 struct proto udpv6_prot = {
1473 .name = "UDPv6",
1474 .owner = THIS_MODULE,
1475 .close = udp_lib_close,
1476 .connect = ip6_datagram_connect,
1477 .disconnect = udp_disconnect,
1478 .ioctl = udp_ioctl,
1479 .destroy = udpv6_destroy_sock,
1480 .setsockopt = udpv6_setsockopt,
1481 .getsockopt = udpv6_getsockopt,
1482 .sendmsg = udpv6_sendmsg,
1483 .recvmsg = udpv6_recvmsg,
1484 .backlog_rcv = __udpv6_queue_rcv_skb,
1485 .hash = udp_lib_hash,
1486 .unhash = udp_lib_unhash,
1487 .rehash = udp_v6_rehash,
1488 .get_port = udp_v6_get_port,
1489 .memory_allocated = &udp_memory_allocated,
1490 .sysctl_mem = sysctl_udp_mem,
1491 .sysctl_wmem = &sysctl_udp_wmem_min,
1492 .sysctl_rmem = &sysctl_udp_rmem_min,
1493 .obj_size = sizeof(struct udp6_sock),
1494 .slab_flags = SLAB_DESTROY_BY_RCU,
1495 .h.udp_table = &udp_table,
1496 #ifdef CONFIG_COMPAT
1497 .compat_setsockopt = compat_udpv6_setsockopt,
1498 .compat_getsockopt = compat_udpv6_getsockopt,
1499 #endif
1500 .clear_sk = udp_v6_clear_sk,
1501 };
1502
1503 static struct inet_protosw udpv6_protosw = {
1504 .type = SOCK_DGRAM,
1505 .protocol = IPPROTO_UDP,
1506 .prot = &udpv6_prot,
1507 .ops = &inet6_dgram_ops,
1508 .flags = INET_PROTOSW_PERMANENT,
1509 };
1510
1511
1512 int __init udpv6_init(void)
1513 {
1514 int ret;
1515
1516 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
1517 if (ret)
1518 goto out;
1519
1520 ret = inet6_register_protosw(&udpv6_protosw);
1521 if (ret)
1522 goto out_udpv6_protocol;
1523 out:
1524 return ret;
1525
1526 out_udpv6_protocol:
1527 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1528 goto out;
1529 }
1530
1531 void udpv6_exit(void)
1532 {
1533 inet6_unregister_protosw(&udpv6_protosw);
1534 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1535 }
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