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Merge branch 'for-linus' of git://git.kernel.dk/linux-block
[linux/fpc-iii.git] / net / ipv6 / udp.c
blob4a3e65626e8baddf5d7d1c246e6e5fded2b08b8a
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 <linux/uaccess.h>
39
40 #include <net/addrconf.h>
41 #include <net/ndisc.h>
42 #include <net/protocol.h>
43 #include <net/transp_v6.h>
44 #include <net/ip6_route.h>
45 #include <net/raw.h>
46 #include <net/tcp_states.h>
47 #include <net/ip6_checksum.h>
48 #include <net/xfrm.h>
49 #include <net/inet_hashtables.h>
50 #include <net/inet6_hashtables.h>
51 #include <net/busy_poll.h>
52 #include <net/sock_reuseport.h>
53
54 #include <linux/proc_fs.h>
55 #include <linux/seq_file.h>
56 #include <trace/events/skb.h>
57 #include "udp_impl.h"
58
59 static bool udp6_lib_exact_dif_match(struct net *net, struct sk_buff *skb)
60 {
61 #if defined(CONFIG_NET_L3_MASTER_DEV)
62 if (!net->ipv4.sysctl_udp_l3mdev_accept &&
63 skb && ipv6_l3mdev_skb(IP6CB(skb)->flags))
64 return true;
65 #endif
66 return false;
67 }
68
69 static u32 udp6_ehashfn(const struct net *net,
70 const struct in6_addr *laddr,
71 const u16 lport,
72 const struct in6_addr *faddr,
73 const __be16 fport)
74 {
75 static u32 udp6_ehash_secret __read_mostly;
76 static u32 udp_ipv6_hash_secret __read_mostly;
77
78 u32 lhash, fhash;
79
80 net_get_random_once(&udp6_ehash_secret,
81 sizeof(udp6_ehash_secret));
82 net_get_random_once(&udp_ipv6_hash_secret,
83 sizeof(udp_ipv6_hash_secret));
84
85 lhash = (__force u32)laddr->s6_addr32[3];
86 fhash = __ipv6_addr_jhash(faddr, udp_ipv6_hash_secret);
87
88 return __inet6_ehashfn(lhash, lport, fhash, fport,
89 udp_ipv6_hash_secret + net_hash_mix(net));
90 }
91
92 static u32 udp6_portaddr_hash(const struct net *net,
93 const struct in6_addr *addr6,
94 unsigned int port)
95 {
96 unsigned int hash, mix = net_hash_mix(net);
97
98 if (ipv6_addr_any(addr6))
99 hash = jhash_1word(0, mix);
100 else if (ipv6_addr_v4mapped(addr6))
101 hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix);
102 else
103 hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix);
104
105 return hash ^ port;
106 }
107
108 int udp_v6_get_port(struct sock *sk, unsigned short snum)
109 {
110 unsigned int hash2_nulladdr =
111 udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum);
112 unsigned int hash2_partial =
113 udp6_portaddr_hash(sock_net(sk), &sk->sk_v6_rcv_saddr, 0);
114
115 /* precompute partial secondary hash */
116 udp_sk(sk)->udp_portaddr_hash = hash2_partial;
117 return udp_lib_get_port(sk, snum, hash2_nulladdr);
118 }
119
120 static void udp_v6_rehash(struct sock *sk)
121 {
122 u16 new_hash = udp6_portaddr_hash(sock_net(sk),
123 &sk->sk_v6_rcv_saddr,
124 inet_sk(sk)->inet_num);
125
126 udp_lib_rehash(sk, new_hash);
127 }
128
129 static int compute_score(struct sock *sk, struct net *net,
130 const struct in6_addr *saddr, __be16 sport,
131 const struct in6_addr *daddr, unsigned short hnum,
132 int dif, bool exact_dif)
133 {
134 int score;
135 struct inet_sock *inet;
136
137 if (!net_eq(sock_net(sk), net) ||
138 udp_sk(sk)->udp_port_hash != hnum ||
139 sk->sk_family != PF_INET6)
140 return -1;
141
142 score = 0;
143 inet = inet_sk(sk);
144
145 if (inet->inet_dport) {
146 if (inet->inet_dport != sport)
147 return -1;
148 score++;
149 }
150
151 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
152 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr))
153 return -1;
154 score++;
155 }
156
157 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
158 if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr))
159 return -1;
160 score++;
161 }
162
163 if (sk->sk_bound_dev_if || exact_dif) {
164 if (sk->sk_bound_dev_if != dif)
165 return -1;
166 score++;
167 }
168
169 if (sk->sk_incoming_cpu == raw_smp_processor_id())
170 score++;
171
172 return score;
173 }
174
175 /* called with rcu_read_lock() */
176 static struct sock *udp6_lib_lookup2(struct net *net,
177 const struct in6_addr *saddr, __be16 sport,
178 const struct in6_addr *daddr, unsigned int hnum, int dif,
179 bool exact_dif, struct udp_hslot *hslot2,
180 struct sk_buff *skb)
181 {
182 struct sock *sk, *result;
183 int score, badness, matches = 0, reuseport = 0;
184 u32 hash = 0;
185
186 result = NULL;
187 badness = -1;
188 udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) {
189 score = compute_score(sk, net, saddr, sport,
190 daddr, hnum, dif, exact_dif);
191 if (score > badness) {
192 reuseport = sk->sk_reuseport;
193 if (reuseport) {
194 hash = udp6_ehashfn(net, daddr, hnum,
195 saddr, sport);
196
197 result = reuseport_select_sock(sk, hash, skb,
198 sizeof(struct udphdr));
199 if (result)
200 return result;
201 matches = 1;
202 }
203 result = sk;
204 badness = score;
205 } else if (score == badness && reuseport) {
206 matches++;
207 if (reciprocal_scale(hash, matches) == 0)
208 result = sk;
209 hash = next_pseudo_random32(hash);
210 }
211 }
212 return result;
213 }
214
215 /* rcu_read_lock() must be held */
216 struct sock *__udp6_lib_lookup(struct net *net,
217 const struct in6_addr *saddr, __be16 sport,
218 const struct in6_addr *daddr, __be16 dport,
219 int dif, struct udp_table *udptable,
220 struct sk_buff *skb)
221 {
222 struct sock *sk, *result;
223 unsigned short hnum = ntohs(dport);
224 unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask);
225 struct udp_hslot *hslot2, *hslot = &udptable->hash[slot];
226 bool exact_dif = udp6_lib_exact_dif_match(net, skb);
227 int score, badness, matches = 0, reuseport = 0;
228 u32 hash = 0;
229
230 if (hslot->count > 10) {
231 hash2 = udp6_portaddr_hash(net, daddr, hnum);
232 slot2 = hash2 & udptable->mask;
233 hslot2 = &udptable->hash2[slot2];
234 if (hslot->count < hslot2->count)
235 goto begin;
236
237 result = udp6_lib_lookup2(net, saddr, sport,
238 daddr, hnum, dif, exact_dif,
239 hslot2, skb);
240 if (!result) {
241 unsigned int old_slot2 = slot2;
242 hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum);
243 slot2 = hash2 & udptable->mask;
244 /* avoid searching the same slot again. */
245 if (unlikely(slot2 == old_slot2))
246 return result;
247
248 hslot2 = &udptable->hash2[slot2];
249 if (hslot->count < hslot2->count)
250 goto begin;
251
252 result = udp6_lib_lookup2(net, saddr, sport,
253 daddr, hnum, dif,
254 exact_dif, hslot2,
255 skb);
256 }
257 return result;
258 }
259 begin:
260 result = NULL;
261 badness = -1;
262 sk_for_each_rcu(sk, &hslot->head) {
263 score = compute_score(sk, net, saddr, sport, daddr, hnum, dif,
264 exact_dif);
265 if (score > badness) {
266 reuseport = sk->sk_reuseport;
267 if (reuseport) {
268 hash = udp6_ehashfn(net, daddr, hnum,
269 saddr, sport);
270 result = reuseport_select_sock(sk, hash, skb,
271 sizeof(struct udphdr));
272 if (result)
273 return result;
274 matches = 1;
275 }
276 result = sk;
277 badness = score;
278 } else if (score == badness && reuseport) {
279 matches++;
280 if (reciprocal_scale(hash, matches) == 0)
281 result = sk;
282 hash = next_pseudo_random32(hash);
283 }
284 }
285 return result;
286 }
287 EXPORT_SYMBOL_GPL(__udp6_lib_lookup);
288
289 static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb,
290 __be16 sport, __be16 dport,
291 struct udp_table *udptable)
292 {
293 const struct ipv6hdr *iph = ipv6_hdr(skb);
294 struct sock *sk;
295
296 sk = skb_steal_sock(skb);
297 if (unlikely(sk))
298 return sk;
299 return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport,
300 &iph->daddr, dport, inet6_iif(skb),
301 udptable, skb);
302 }
303
304 struct sock *udp6_lib_lookup_skb(struct sk_buff *skb,
305 __be16 sport, __be16 dport)
306 {
307 const struct ipv6hdr *iph = ipv6_hdr(skb);
308
309 return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport,
310 &iph->daddr, dport, inet6_iif(skb),
311 &udp_table, skb);
312 }
313 EXPORT_SYMBOL_GPL(udp6_lib_lookup_skb);
314
315 /* Must be called under rcu_read_lock().
316 * Does increment socket refcount.
317 */
318 #if IS_ENABLED(CONFIG_NETFILTER_XT_MATCH_SOCKET) || \
319 IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TPROXY) || \
320 IS_ENABLED(CONFIG_NF_SOCKET_IPV6)
321 struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport,
322 const struct in6_addr *daddr, __be16 dport, int dif)
323 {
324 struct sock *sk;
325
326 sk = __udp6_lib_lookup(net, saddr, sport, daddr, dport,
327 dif, &udp_table, NULL);
328 if (sk && !refcount_inc_not_zero(&sk->sk_refcnt))
329 sk = NULL;
330 return sk;
331 }
332 EXPORT_SYMBOL_GPL(udp6_lib_lookup);
333 #endif
334
335 /*
336 * This should be easy, if there is something there we
337 * return it, otherwise we block.
338 */
339
340 int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
341 int noblock, int flags, int *addr_len)
342 {
343 struct ipv6_pinfo *np = inet6_sk(sk);
344 struct inet_sock *inet = inet_sk(sk);
345 struct sk_buff *skb;
346 unsigned int ulen, copied;
347 int peeked, peeking, off;
348 int err;
349 int is_udplite = IS_UDPLITE(sk);
350 bool checksum_valid = false;
351 int is_udp4;
352
353 if (flags & MSG_ERRQUEUE)
354 return ipv6_recv_error(sk, msg, len, addr_len);
355
356 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
357 return ipv6_recv_rxpmtu(sk, msg, len, addr_len);
358
359 try_again:
360 peeking = off = sk_peek_offset(sk, flags);
361 skb = __skb_recv_udp(sk, flags, noblock, &peeked, &off, &err);
362 if (!skb)
363 return err;
364
365 ulen = udp_skb_len(skb);
366 copied = len;
367 if (copied > ulen - off)
368 copied = ulen - off;
369 else if (copied < ulen)
370 msg->msg_flags |= MSG_TRUNC;
371
372 is_udp4 = (skb->protocol == htons(ETH_P_IP));
373
374 /*
375 * If checksum is needed at all, try to do it while copying the
376 * data. If the data is truncated, or if we only want a partial
377 * coverage checksum (UDP-Lite), do it before the copy.
378 */
379
380 if (copied < ulen || peeking ||
381 (is_udplite && UDP_SKB_CB(skb)->partial_cov)) {
382 checksum_valid = udp_skb_csum_unnecessary(skb) ||
383 !__udp_lib_checksum_complete(skb);
384 if (!checksum_valid)
385 goto csum_copy_err;
386 }
387
388 if (checksum_valid || udp_skb_csum_unnecessary(skb)) {
389 if (udp_skb_is_linear(skb))
390 err = copy_linear_skb(skb, copied, off, &msg->msg_iter);
391 else
392 err = skb_copy_datagram_msg(skb, off, msg, copied);
393 } else {
394 err = skb_copy_and_csum_datagram_msg(skb, off, msg);
395 if (err == -EINVAL)
396 goto csum_copy_err;
397 }
398 if (unlikely(err)) {
399 if (!peeked) {
400 atomic_inc(&sk->sk_drops);
401 if (is_udp4)
402 UDP_INC_STATS(sock_net(sk), UDP_MIB_INERRORS,
403 is_udplite);
404 else
405 UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS,
406 is_udplite);
407 }
408 kfree_skb(skb);
409 return err;
410 }
411 if (!peeked) {
412 if (is_udp4)
413 UDP_INC_STATS(sock_net(sk), UDP_MIB_INDATAGRAMS,
414 is_udplite);
415 else
416 UDP6_INC_STATS(sock_net(sk), UDP_MIB_INDATAGRAMS,
417 is_udplite);
418 }
419
420 sock_recv_ts_and_drops(msg, sk, skb);
421
422 /* Copy the address. */
423 if (msg->msg_name) {
424 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
425 sin6->sin6_family = AF_INET6;
426 sin6->sin6_port = udp_hdr(skb)->source;
427 sin6->sin6_flowinfo = 0;
428
429 if (is_udp4) {
430 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
431 &sin6->sin6_addr);
432 sin6->sin6_scope_id = 0;
433 } else {
434 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
435 sin6->sin6_scope_id =
436 ipv6_iface_scope_id(&sin6->sin6_addr,
437 inet6_iif(skb));
438 }
439 *addr_len = sizeof(*sin6);
440 }
441
442 if (np->rxopt.all)
443 ip6_datagram_recv_common_ctl(sk, msg, skb);
444
445 if (is_udp4) {
446 if (inet->cmsg_flags)
447 ip_cmsg_recv_offset(msg, sk, skb,
448 sizeof(struct udphdr), off);
449 } else {
450 if (np->rxopt.all)
451 ip6_datagram_recv_specific_ctl(sk, msg, skb);
452 }
453
454 err = copied;
455 if (flags & MSG_TRUNC)
456 err = ulen;
457
458 skb_consume_udp(sk, skb, peeking ? -err : err);
459 return err;
460
461 csum_copy_err:
462 if (!__sk_queue_drop_skb(sk, &udp_sk(sk)->reader_queue, skb, flags,
463 udp_skb_destructor)) {
464 if (is_udp4) {
465 UDP_INC_STATS(sock_net(sk),
466 UDP_MIB_CSUMERRORS, is_udplite);
467 UDP_INC_STATS(sock_net(sk),
468 UDP_MIB_INERRORS, is_udplite);
469 } else {
470 UDP6_INC_STATS(sock_net(sk),
471 UDP_MIB_CSUMERRORS, is_udplite);
472 UDP6_INC_STATS(sock_net(sk),
473 UDP_MIB_INERRORS, is_udplite);
474 }
475 }
476 kfree_skb(skb);
477
478 /* starting over for a new packet, but check if we need to yield */
479 cond_resched();
480 msg->msg_flags &= ~MSG_TRUNC;
481 goto try_again;
482 }
483
484 void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
485 u8 type, u8 code, int offset, __be32 info,
486 struct udp_table *udptable)
487 {
488 struct ipv6_pinfo *np;
489 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
490 const struct in6_addr *saddr = &hdr->saddr;
491 const struct in6_addr *daddr = &hdr->daddr;
492 struct udphdr *uh = (struct udphdr *)(skb->data+offset);
493 struct sock *sk;
494 int harderr;
495 int err;
496 struct net *net = dev_net(skb->dev);
497
498 sk = __udp6_lib_lookup(net, daddr, uh->dest, saddr, uh->source,
499 inet6_iif(skb), udptable, skb);
500 if (!sk) {
501 __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev),
502 ICMP6_MIB_INERRORS);
503 return;
504 }
505
506 harderr = icmpv6_err_convert(type, code, &err);
507 np = inet6_sk(sk);
508
509 if (type == ICMPV6_PKT_TOOBIG) {
510 if (!ip6_sk_accept_pmtu(sk))
511 goto out;
512 ip6_sk_update_pmtu(skb, sk, info);
513 if (np->pmtudisc != IPV6_PMTUDISC_DONT)
514 harderr = 1;
515 }
516 if (type == NDISC_REDIRECT) {
517 ip6_sk_redirect(skb, sk);
518 goto out;
519 }
520
521 if (!np->recverr) {
522 if (!harderr || sk->sk_state != TCP_ESTABLISHED)
523 goto out;
524 } else {
525 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
526 }
527
528 sk->sk_err = err;
529 sk->sk_error_report(sk);
530 out:
531 return;
532 }
533
534 static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
535 {
536 int rc;
537
538 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
539 sock_rps_save_rxhash(sk, skb);
540 sk_mark_napi_id(sk, skb);
541 sk_incoming_cpu_update(sk);
542 } else {
543 sk_mark_napi_id_once(sk, skb);
544 }
545
546 rc = __udp_enqueue_schedule_skb(sk, skb);
547 if (rc < 0) {
548 int is_udplite = IS_UDPLITE(sk);
549
550 /* Note that an ENOMEM error is charged twice */
551 if (rc == -ENOMEM)
552 UDP6_INC_STATS(sock_net(sk),
553 UDP_MIB_RCVBUFERRORS, is_udplite);
554 UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
555 kfree_skb(skb);
556 return -1;
557 }
558
559 return 0;
560 }
561
562 static __inline__ void udpv6_err(struct sk_buff *skb,
563 struct inet6_skb_parm *opt, u8 type,
564 u8 code, int offset, __be32 info)
565 {
566 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table);
567 }
568
569 static struct static_key udpv6_encap_needed __read_mostly;
570 void udpv6_encap_enable(void)
571 {
572 if (!static_key_enabled(&udpv6_encap_needed))
573 static_key_slow_inc(&udpv6_encap_needed);
574 }
575 EXPORT_SYMBOL(udpv6_encap_enable);
576
577 static int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
578 {
579 struct udp_sock *up = udp_sk(sk);
580 int is_udplite = IS_UDPLITE(sk);
581
582 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
583 goto drop;
584
585 if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
586 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
587
588 /*
589 * This is an encapsulation socket so pass the skb to
590 * the socket's udp_encap_rcv() hook. Otherwise, just
591 * fall through and pass this up the UDP socket.
592 * up->encap_rcv() returns the following value:
593 * =0 if skb was successfully passed to the encap
594 * handler or was discarded by it.
595 * >0 if skb should be passed on to UDP.
596 * <0 if skb should be resubmitted as proto -N
597 */
598
599 /* if we're overly short, let UDP handle it */
600 encap_rcv = ACCESS_ONCE(up->encap_rcv);
601 if (encap_rcv) {
602 int ret;
603
604 /* Verify checksum before giving to encap */
605 if (udp_lib_checksum_complete(skb))
606 goto csum_error;
607
608 ret = encap_rcv(sk, skb);
609 if (ret <= 0) {
610 __UDP_INC_STATS(sock_net(sk),
611 UDP_MIB_INDATAGRAMS,
612 is_udplite);
613 return -ret;
614 }
615 }
616
617 /* FALLTHROUGH -- it's a UDP Packet */
618 }
619
620 /*
621 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
622 */
623 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
624
625 if (up->pcrlen == 0) { /* full coverage was set */
626 net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n",
627 UDP_SKB_CB(skb)->cscov, skb->len);
628 goto drop;
629 }
630 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
631 net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n",
632 UDP_SKB_CB(skb)->cscov, up->pcrlen);
633 goto drop;
634 }
635 }
636
637 prefetch(&sk->sk_rmem_alloc);
638 if (rcu_access_pointer(sk->sk_filter) &&
639 udp_lib_checksum_complete(skb))
640 goto csum_error;
641
642 if (sk_filter_trim_cap(sk, skb, sizeof(struct udphdr)))
643 goto drop;
644
645 udp_csum_pull_header(skb);
646
647 skb_dst_drop(skb);
648
649 return __udpv6_queue_rcv_skb(sk, skb);
650
651 csum_error:
652 __UDP6_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite);
653 drop:
654 __UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
655 atomic_inc(&sk->sk_drops);
656 kfree_skb(skb);
657 return -1;
658 }
659
660 static bool __udp_v6_is_mcast_sock(struct net *net, struct sock *sk,
661 __be16 loc_port, const struct in6_addr *loc_addr,
662 __be16 rmt_port, const struct in6_addr *rmt_addr,
663 int dif, unsigned short hnum)
664 {
665 struct inet_sock *inet = inet_sk(sk);
666
667 if (!net_eq(sock_net(sk), net))
668 return false;
669
670 if (udp_sk(sk)->udp_port_hash != hnum ||
671 sk->sk_family != PF_INET6 ||
672 (inet->inet_dport && inet->inet_dport != rmt_port) ||
673 (!ipv6_addr_any(&sk->sk_v6_daddr) &&
674 !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) ||
675 (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif) ||
676 (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) &&
677 !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr)))
678 return false;
679 if (!inet6_mc_check(sk, loc_addr, rmt_addr))
680 return false;
681 return true;
682 }
683
684 static void udp6_csum_zero_error(struct sk_buff *skb)
685 {
686 /* RFC 2460 section 8.1 says that we SHOULD log
687 * this error. Well, it is reasonable.
688 */
689 net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n",
690 &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source),
691 &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest));
692 }
693
694 /*
695 * Note: called only from the BH handler context,
696 * so we don't need to lock the hashes.
697 */
698 static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
699 const struct in6_addr *saddr, const struct in6_addr *daddr,
700 struct udp_table *udptable, int proto)
701 {
702 struct sock *sk, *first = NULL;
703 const struct udphdr *uh = udp_hdr(skb);
704 unsigned short hnum = ntohs(uh->dest);
705 struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum);
706 unsigned int offset = offsetof(typeof(*sk), sk_node);
707 unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10);
708 int dif = inet6_iif(skb);
709 struct hlist_node *node;
710 struct sk_buff *nskb;
711
712 if (use_hash2) {
713 hash2_any = udp6_portaddr_hash(net, &in6addr_any, hnum) &
714 udptable->mask;
715 hash2 = udp6_portaddr_hash(net, daddr, hnum) & udptable->mask;
716 start_lookup:
717 hslot = &udptable->hash2[hash2];
718 offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node);
719 }
720
721 sk_for_each_entry_offset_rcu(sk, node, &hslot->head, offset) {
722 if (!__udp_v6_is_mcast_sock(net, sk, uh->dest, daddr,
723 uh->source, saddr, dif, hnum))
724 continue;
725 /* If zero checksum and no_check is not on for
726 * the socket then skip it.
727 */
728 if (!uh->check && !udp_sk(sk)->no_check6_rx)
729 continue;
730 if (!first) {
731 first = sk;
732 continue;
733 }
734 nskb = skb_clone(skb, GFP_ATOMIC);
735 if (unlikely(!nskb)) {
736 atomic_inc(&sk->sk_drops);
737 __UDP6_INC_STATS(net, UDP_MIB_RCVBUFERRORS,
738 IS_UDPLITE(sk));
739 __UDP6_INC_STATS(net, UDP_MIB_INERRORS,
740 IS_UDPLITE(sk));
741 continue;
742 }
743
744 if (udpv6_queue_rcv_skb(sk, nskb) > 0)
745 consume_skb(nskb);
746 }
747
748 /* Also lookup *:port if we are using hash2 and haven't done so yet. */
749 if (use_hash2 && hash2 != hash2_any) {
750 hash2 = hash2_any;
751 goto start_lookup;
752 }
753
754 if (first) {
755 if (udpv6_queue_rcv_skb(first, skb) > 0)
756 consume_skb(skb);
757 } else {
758 kfree_skb(skb);
759 __UDP6_INC_STATS(net, UDP_MIB_IGNOREDMULTI,
760 proto == IPPROTO_UDPLITE);
761 }
762 return 0;
763 }
764
765 int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
766 int proto)
767 {
768 const struct in6_addr *saddr, *daddr;
769 struct net *net = dev_net(skb->dev);
770 struct udphdr *uh;
771 struct sock *sk;
772 u32 ulen = 0;
773
774 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
775 goto discard;
776
777 saddr = &ipv6_hdr(skb)->saddr;
778 daddr = &ipv6_hdr(skb)->daddr;
779 uh = udp_hdr(skb);
780
781 ulen = ntohs(uh->len);
782 if (ulen > skb->len)
783 goto short_packet;
784
785 if (proto == IPPROTO_UDP) {
786 /* UDP validates ulen. */
787
788 /* Check for jumbo payload */
789 if (ulen == 0)
790 ulen = skb->len;
791
792 if (ulen < sizeof(*uh))
793 goto short_packet;
794
795 if (ulen < skb->len) {
796 if (pskb_trim_rcsum(skb, ulen))
797 goto short_packet;
798 saddr = &ipv6_hdr(skb)->saddr;
799 daddr = &ipv6_hdr(skb)->daddr;
800 uh = udp_hdr(skb);
801 }
802 }
803
804 if (udp6_csum_init(skb, uh, proto))
805 goto csum_error;
806
807 /*
808 * Multicast receive code
809 */
810 if (ipv6_addr_is_multicast(daddr))
811 return __udp6_lib_mcast_deliver(net, skb,
812 saddr, daddr, udptable, proto);
813
814 /* Unicast */
815
816 /*
817 * check socket cache ... must talk to Alan about his plans
818 * for sock caches... i'll skip this for now.
819 */
820 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
821 if (sk) {
822 int ret;
823
824 if (!uh->check && !udp_sk(sk)->no_check6_rx) {
825 udp6_csum_zero_error(skb);
826 goto csum_error;
827 }
828
829 if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk))
830 skb_checksum_try_convert(skb, IPPROTO_UDP, uh->check,
831 ip6_compute_pseudo);
832
833 ret = udpv6_queue_rcv_skb(sk, skb);
834
835 /* a return value > 0 means to resubmit the input */
836 if (ret > 0)
837 return ret;
838
839 return 0;
840 }
841
842 if (!uh->check) {
843 udp6_csum_zero_error(skb);
844 goto csum_error;
845 }
846
847 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
848 goto discard;
849
850 if (udp_lib_checksum_complete(skb))
851 goto csum_error;
852
853 __UDP6_INC_STATS(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
854 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
855
856 kfree_skb(skb);
857 return 0;
858
859 short_packet:
860 net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n",
861 proto == IPPROTO_UDPLITE ? "-Lite" : "",
862 saddr, ntohs(uh->source),
863 ulen, skb->len,
864 daddr, ntohs(uh->dest));
865 goto discard;
866 csum_error:
867 __UDP6_INC_STATS(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE);
868 discard:
869 __UDP6_INC_STATS(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
870 kfree_skb(skb);
871 return 0;
872 }
873
874
875 static struct sock *__udp6_lib_demux_lookup(struct net *net,
876 __be16 loc_port, const struct in6_addr *loc_addr,
877 __be16 rmt_port, const struct in6_addr *rmt_addr,
878 int dif)
879 {
880 unsigned short hnum = ntohs(loc_port);
881 unsigned int hash2 = udp6_portaddr_hash(net, loc_addr, hnum);
882 unsigned int slot2 = hash2 & udp_table.mask;
883 struct udp_hslot *hslot2 = &udp_table.hash2[slot2];
884 const __portpair ports = INET_COMBINED_PORTS(rmt_port, hnum);
885 struct sock *sk;
886
887 udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) {
888 if (sk->sk_state == TCP_ESTABLISHED &&
889 INET6_MATCH(sk, net, rmt_addr, loc_addr, ports, dif))
890 return sk;
891 /* Only check first socket in chain */
892 break;
893 }
894 return NULL;
895 }
896
897 static void udp_v6_early_demux(struct sk_buff *skb)
898 {
899 struct net *net = dev_net(skb->dev);
900 const struct udphdr *uh;
901 struct sock *sk;
902 struct dst_entry *dst;
903 int dif = skb->dev->ifindex;
904
905 if (!pskb_may_pull(skb, skb_transport_offset(skb) +
906 sizeof(struct udphdr)))
907 return;
908
909 uh = udp_hdr(skb);
910
911 if (skb->pkt_type == PACKET_HOST)
912 sk = __udp6_lib_demux_lookup(net, uh->dest,
913 &ipv6_hdr(skb)->daddr,
914 uh->source, &ipv6_hdr(skb)->saddr,
915 dif);
916 else
917 return;
918
919 if (!sk || !refcount_inc_not_zero(&sk->sk_refcnt))
920 return;
921
922 skb->sk = sk;
923 skb->destructor = sock_efree;
924 dst = READ_ONCE(sk->sk_rx_dst);
925
926 if (dst)
927 dst = dst_check(dst, inet6_sk(sk)->rx_dst_cookie);
928 if (dst) {
929 /* set noref for now.
930 * any place which wants to hold dst has to call
931 * dst_hold_safe()
932 */
933 skb_dst_set_noref(skb, dst);
934 }
935 }
936
937 static __inline__ int udpv6_rcv(struct sk_buff *skb)
938 {
939 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP);
940 }
941
942 /*
943 * Throw away all pending data and cancel the corking. Socket is locked.
944 */
945 static void udp_v6_flush_pending_frames(struct sock *sk)
946 {
947 struct udp_sock *up = udp_sk(sk);
948
949 if (up->pending == AF_INET)
950 udp_flush_pending_frames(sk);
951 else if (up->pending) {
952 up->len = 0;
953 up->pending = 0;
954 ip6_flush_pending_frames(sk);
955 }
956 }
957
958 /**
959 * udp6_hwcsum_outgoing - handle outgoing HW checksumming
960 * @sk: socket we are sending on
961 * @skb: sk_buff containing the filled-in UDP header
962 * (checksum field must be zeroed out)
963 */
964 static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
965 const struct in6_addr *saddr,
966 const struct in6_addr *daddr, int len)
967 {
968 unsigned int offset;
969 struct udphdr *uh = udp_hdr(skb);
970 struct sk_buff *frags = skb_shinfo(skb)->frag_list;
971 __wsum csum = 0;
972
973 if (!frags) {
974 /* Only one fragment on the socket. */
975 skb->csum_start = skb_transport_header(skb) - skb->head;
976 skb->csum_offset = offsetof(struct udphdr, check);
977 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0);
978 } else {
979 /*
980 * HW-checksum won't work as there are two or more
981 * fragments on the socket so that all csums of sk_buffs
982 * should be together
983 */
984 offset = skb_transport_offset(skb);
985 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
986
987 skb->ip_summed = CHECKSUM_NONE;
988
989 do {
990 csum = csum_add(csum, frags->csum);
991 } while ((frags = frags->next));
992
993 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP,
994 csum);
995 if (uh->check == 0)
996 uh->check = CSUM_MANGLED_0;
997 }
998 }
999
1000 /*
1001 * Sending
1002 */
1003
1004 static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6)
1005 {
1006 struct sock *sk = skb->sk;
1007 struct udphdr *uh;
1008 int err = 0;
1009 int is_udplite = IS_UDPLITE(sk);
1010 __wsum csum = 0;
1011 int offset = skb_transport_offset(skb);
1012 int len = skb->len - offset;
1013
1014 /*
1015 * Create a UDP header
1016 */
1017 uh = udp_hdr(skb);
1018 uh->source = fl6->fl6_sport;
1019 uh->dest = fl6->fl6_dport;
1020 uh->len = htons(len);
1021 uh->check = 0;
1022
1023 if (is_udplite)
1024 csum = udplite_csum(skb);
1025 else if (udp_sk(sk)->no_check6_tx) { /* UDP csum disabled */
1026 skb->ip_summed = CHECKSUM_NONE;
1027 goto send;
1028 } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
1029 udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, len);
1030 goto send;
1031 } else
1032 csum = udp_csum(skb);
1033
1034 /* add protocol-dependent pseudo-header */
1035 uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
1036 len, fl6->flowi6_proto, csum);
1037 if (uh->check == 0)
1038 uh->check = CSUM_MANGLED_0;
1039
1040 send:
1041 err = ip6_send_skb(skb);
1042 if (err) {
1043 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) {
1044 UDP6_INC_STATS(sock_net(sk),
1045 UDP_MIB_SNDBUFERRORS, is_udplite);
1046 err = 0;
1047 }
1048 } else {
1049 UDP6_INC_STATS(sock_net(sk),
1050 UDP_MIB_OUTDATAGRAMS, is_udplite);
1051 }
1052 return err;
1053 }
1054
1055 static int udp_v6_push_pending_frames(struct sock *sk)
1056 {
1057 struct sk_buff *skb;
1058 struct udp_sock *up = udp_sk(sk);
1059 struct flowi6 fl6;
1060 int err = 0;
1061
1062 if (up->pending == AF_INET)
1063 return udp_push_pending_frames(sk);
1064
1065 /* ip6_finish_skb will release the cork, so make a copy of
1066 * fl6 here.
1067 */
1068 fl6 = inet_sk(sk)->cork.fl.u.ip6;
1069
1070 skb = ip6_finish_skb(sk);
1071 if (!skb)
1072 goto out;
1073
1074 err = udp_v6_send_skb(skb, &fl6);
1075
1076 out:
1077 up->len = 0;
1078 up->pending = 0;
1079 return err;
1080 }
1081
1082 int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
1083 {
1084 struct ipv6_txoptions opt_space;
1085 struct udp_sock *up = udp_sk(sk);
1086 struct inet_sock *inet = inet_sk(sk);
1087 struct ipv6_pinfo *np = inet6_sk(sk);
1088 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
1089 struct in6_addr *daddr, *final_p, final;
1090 struct ipv6_txoptions *opt = NULL;
1091 struct ipv6_txoptions *opt_to_free = NULL;
1092 struct ip6_flowlabel *flowlabel = NULL;
1093 struct flowi6 fl6;
1094 struct dst_entry *dst;
1095 struct ipcm6_cookie ipc6;
1096 int addr_len = msg->msg_namelen;
1097 int ulen = len;
1098 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
1099 int err;
1100 int connected = 0;
1101 int is_udplite = IS_UDPLITE(sk);
1102 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
1103 struct sockcm_cookie sockc;
1104
1105 ipc6.hlimit = -1;
1106 ipc6.tclass = -1;
1107 ipc6.dontfrag = -1;
1108 sockc.tsflags = sk->sk_tsflags;
1109
1110 /* destination address check */
1111 if (sin6) {
1112 if (addr_len < offsetof(struct sockaddr, sa_data))
1113 return -EINVAL;
1114
1115 switch (sin6->sin6_family) {
1116 case AF_INET6:
1117 if (addr_len < SIN6_LEN_RFC2133)
1118 return -EINVAL;
1119 daddr = &sin6->sin6_addr;
1120 if (ipv6_addr_any(daddr) &&
1121 ipv6_addr_v4mapped(&np->saddr))
1122 ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK),
1123 daddr);
1124 break;
1125 case AF_INET:
1126 goto do_udp_sendmsg;
1127 case AF_UNSPEC:
1128 msg->msg_name = sin6 = NULL;
1129 msg->msg_namelen = addr_len = 0;
1130 daddr = NULL;
1131 break;
1132 default:
1133 return -EINVAL;
1134 }
1135 } else if (!up->pending) {
1136 if (sk->sk_state != TCP_ESTABLISHED)
1137 return -EDESTADDRREQ;
1138 daddr = &sk->sk_v6_daddr;
1139 } else
1140 daddr = NULL;
1141
1142 if (daddr) {
1143 if (ipv6_addr_v4mapped(daddr)) {
1144 struct sockaddr_in sin;
1145 sin.sin_family = AF_INET;
1146 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport;
1147 sin.sin_addr.s_addr = daddr->s6_addr32[3];
1148 msg->msg_name = &sin;
1149 msg->msg_namelen = sizeof(sin);
1150 do_udp_sendmsg:
1151 if (__ipv6_only_sock(sk))
1152 return -ENETUNREACH;
1153 return udp_sendmsg(sk, msg, len);
1154 }
1155 }
1156
1157 if (up->pending == AF_INET)
1158 return udp_sendmsg(sk, msg, len);
1159
1160 /* Rough check on arithmetic overflow,
1161 better check is made in ip6_append_data().
1162 */
1163 if (len > INT_MAX - sizeof(struct udphdr))
1164 return -EMSGSIZE;
1165
1166 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
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)
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 fl6.flowi6_uid = sk->sk_uid;
1233
1234 if (msg->msg_controllen) {
1235 opt = &opt_space;
1236 memset(opt, 0, sizeof(struct ipv6_txoptions));
1237 opt->tot_len = sizeof(*opt);
1238 ipc6.opt = opt;
1239
1240 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, &ipc6, &sockc);
1241 if (err < 0) {
1242 fl6_sock_release(flowlabel);
1243 return err;
1244 }
1245 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
1246 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1247 if (!flowlabel)
1248 return -EINVAL;
1249 }
1250 if (!(opt->opt_nflen|opt->opt_flen))
1251 opt = NULL;
1252 connected = 0;
1253 }
1254 if (!opt) {
1255 opt = txopt_get(np);
1256 opt_to_free = opt;
1257 }
1258 if (flowlabel)
1259 opt = fl6_merge_options(&opt_space, flowlabel, opt);
1260 opt = ipv6_fixup_options(&opt_space, opt);
1261 ipc6.opt = opt;
1262
1263 fl6.flowi6_proto = sk->sk_protocol;
1264 if (!ipv6_addr_any(daddr))
1265 fl6.daddr = *daddr;
1266 else
1267 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
1268 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
1269 fl6.saddr = np->saddr;
1270 fl6.fl6_sport = inet->inet_sport;
1271
1272 final_p = fl6_update_dst(&fl6, opt, &final);
1273 if (final_p)
1274 connected = 0;
1275
1276 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) {
1277 fl6.flowi6_oif = np->mcast_oif;
1278 connected = 0;
1279 } else if (!fl6.flowi6_oif)
1280 fl6.flowi6_oif = np->ucast_oif;
1281
1282 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
1283
1284 if (ipc6.tclass < 0)
1285 ipc6.tclass = np->tclass;
1286
1287 fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel);
1288
1289 dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p);
1290 if (IS_ERR(dst)) {
1291 err = PTR_ERR(dst);
1292 dst = NULL;
1293 goto out;
1294 }
1295
1296 if (ipc6.hlimit < 0)
1297 ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
1298
1299 if (msg->msg_flags&MSG_CONFIRM)
1300 goto do_confirm;
1301 back_from_confirm:
1302
1303 /* Lockless fast path for the non-corking case */
1304 if (!corkreq) {
1305 struct sk_buff *skb;
1306
1307 skb = ip6_make_skb(sk, getfrag, msg, ulen,
1308 sizeof(struct udphdr), &ipc6,
1309 &fl6, (struct rt6_info *)dst,
1310 msg->msg_flags, &sockc);
1311 err = PTR_ERR(skb);
1312 if (!IS_ERR_OR_NULL(skb))
1313 err = udp_v6_send_skb(skb, &fl6);
1314 goto release_dst;
1315 }
1316
1317 lock_sock(sk);
1318 if (unlikely(up->pending)) {
1319 /* The socket is already corked while preparing it. */
1320 /* ... which is an evident application bug. --ANK */
1321 release_sock(sk);
1322
1323 net_dbg_ratelimited("udp cork app bug 2\n");
1324 err = -EINVAL;
1325 goto out;
1326 }
1327
1328 up->pending = AF_INET6;
1329
1330 do_append_data:
1331 if (ipc6.dontfrag < 0)
1332 ipc6.dontfrag = np->dontfrag;
1333 up->len += ulen;
1334 err = ip6_append_data(sk, getfrag, msg, ulen, sizeof(struct udphdr),
1335 &ipc6, &fl6, (struct rt6_info *)dst,
1336 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, &sockc);
1337 if (err)
1338 udp_v6_flush_pending_frames(sk);
1339 else if (!corkreq)
1340 err = udp_v6_push_pending_frames(sk);
1341 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
1342 up->pending = 0;
1343
1344 if (err > 0)
1345 err = np->recverr ? net_xmit_errno(err) : 0;
1346 release_sock(sk);
1347
1348 release_dst:
1349 if (dst) {
1350 if (connected) {
1351 ip6_dst_store(sk, dst,
1352 ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ?
1353 &sk->sk_v6_daddr : NULL,
1354 #ifdef CONFIG_IPV6_SUBTREES
1355 ipv6_addr_equal(&fl6.saddr, &np->saddr) ?
1356 &np->saddr :
1357 #endif
1358 NULL);
1359 } else {
1360 dst_release(dst);
1361 }
1362 dst = NULL;
1363 }
1364
1365 out:
1366 dst_release(dst);
1367 fl6_sock_release(flowlabel);
1368 txopt_put(opt_to_free);
1369 if (!err)
1370 return len;
1371 /*
1372 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
1373 * ENOBUFS might not be good (it's not tunable per se), but otherwise
1374 * we don't have a good statistic (IpOutDiscards but it can be too many
1375 * things). We could add another new stat but at least for now that
1376 * seems like overkill.
1377 */
1378 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
1379 UDP6_INC_STATS(sock_net(sk),
1380 UDP_MIB_SNDBUFERRORS, is_udplite);
1381 }
1382 return err;
1383
1384 do_confirm:
1385 if (msg->msg_flags & MSG_PROBE)
1386 dst_confirm_neigh(dst, &fl6.daddr);
1387 if (!(msg->msg_flags&MSG_PROBE) || len)
1388 goto back_from_confirm;
1389 err = 0;
1390 goto out;
1391 }
1392
1393 void udpv6_destroy_sock(struct sock *sk)
1394 {
1395 struct udp_sock *up = udp_sk(sk);
1396 lock_sock(sk);
1397 udp_v6_flush_pending_frames(sk);
1398 release_sock(sk);
1399
1400 if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
1401 void (*encap_destroy)(struct sock *sk);
1402 encap_destroy = ACCESS_ONCE(up->encap_destroy);
1403 if (encap_destroy)
1404 encap_destroy(sk);
1405 }
1406
1407 inet6_destroy_sock(sk);
1408 }
1409
1410 /*
1411 * Socket option code for UDP
1412 */
1413 int udpv6_setsockopt(struct sock *sk, int level, int optname,
1414 char __user *optval, unsigned int optlen)
1415 {
1416 if (level == SOL_UDP || level == SOL_UDPLITE)
1417 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1418 udp_v6_push_pending_frames);
1419 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1420 }
1421
1422 #ifdef CONFIG_COMPAT
1423 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
1424 char __user *optval, unsigned int optlen)
1425 {
1426 if (level == SOL_UDP || level == SOL_UDPLITE)
1427 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1428 udp_v6_push_pending_frames);
1429 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
1430 }
1431 #endif
1432
1433 int udpv6_getsockopt(struct sock *sk, int level, int optname,
1434 char __user *optval, int __user *optlen)
1435 {
1436 if (level == SOL_UDP || level == SOL_UDPLITE)
1437 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1438 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1439 }
1440
1441 #ifdef CONFIG_COMPAT
1442 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
1443 char __user *optval, int __user *optlen)
1444 {
1445 if (level == SOL_UDP || level == SOL_UDPLITE)
1446 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1447 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
1448 }
1449 #endif
1450
1451 static struct inet6_protocol udpv6_protocol = {
1452 .early_demux = udp_v6_early_demux,
1453 .early_demux_handler = udp_v6_early_demux,
1454 .handler = udpv6_rcv,
1455 .err_handler = udpv6_err,
1456 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1457 };
1458
1459 /* ------------------------------------------------------------------------ */
1460 #ifdef CONFIG_PROC_FS
1461 int udp6_seq_show(struct seq_file *seq, void *v)
1462 {
1463 if (v == SEQ_START_TOKEN) {
1464 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
1465 } else {
1466 int bucket = ((struct udp_iter_state *)seq->private)->bucket;
1467 struct inet_sock *inet = inet_sk(v);
1468 __u16 srcp = ntohs(inet->inet_sport);
1469 __u16 destp = ntohs(inet->inet_dport);
1470 ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket);
1471 }
1472 return 0;
1473 }
1474
1475 static const struct file_operations udp6_afinfo_seq_fops = {
1476 .owner = THIS_MODULE,
1477 .open = udp_seq_open,
1478 .read = seq_read,
1479 .llseek = seq_lseek,
1480 .release = seq_release_net
1481 };
1482
1483 static struct udp_seq_afinfo udp6_seq_afinfo = {
1484 .name = "udp6",
1485 .family = AF_INET6,
1486 .udp_table = &udp_table,
1487 .seq_fops = &udp6_afinfo_seq_fops,
1488 .seq_ops = {
1489 .show = udp6_seq_show,
1490 },
1491 };
1492
1493 int __net_init udp6_proc_init(struct net *net)
1494 {
1495 return udp_proc_register(net, &udp6_seq_afinfo);
1496 }
1497
1498 void udp6_proc_exit(struct net *net)
1499 {
1500 udp_proc_unregister(net, &udp6_seq_afinfo);
1501 }
1502 #endif /* CONFIG_PROC_FS */
1503
1504 /* ------------------------------------------------------------------------ */
1505
1506 struct proto udpv6_prot = {
1507 .name = "UDPv6",
1508 .owner = THIS_MODULE,
1509 .close = udp_lib_close,
1510 .connect = ip6_datagram_connect,
1511 .disconnect = udp_disconnect,
1512 .ioctl = udp_ioctl,
1513 .init = udp_init_sock,
1514 .destroy = udpv6_destroy_sock,
1515 .setsockopt = udpv6_setsockopt,
1516 .getsockopt = udpv6_getsockopt,
1517 .sendmsg = udpv6_sendmsg,
1518 .recvmsg = udpv6_recvmsg,
1519 .release_cb = ip6_datagram_release_cb,
1520 .hash = udp_lib_hash,
1521 .unhash = udp_lib_unhash,
1522 .rehash = udp_v6_rehash,
1523 .get_port = udp_v6_get_port,
1524 .memory_allocated = &udp_memory_allocated,
1525 .sysctl_mem = sysctl_udp_mem,
1526 .sysctl_wmem = &sysctl_udp_wmem_min,
1527 .sysctl_rmem = &sysctl_udp_rmem_min,
1528 .obj_size = sizeof(struct udp6_sock),
1529 .h.udp_table = &udp_table,
1530 #ifdef CONFIG_COMPAT
1531 .compat_setsockopt = compat_udpv6_setsockopt,
1532 .compat_getsockopt = compat_udpv6_getsockopt,
1533 #endif
1534 .diag_destroy = udp_abort,
1535 };
1536
1537 static struct inet_protosw udpv6_protosw = {
1538 .type = SOCK_DGRAM,
1539 .protocol = IPPROTO_UDP,
1540 .prot = &udpv6_prot,
1541 .ops = &inet6_dgram_ops,
1542 .flags = INET_PROTOSW_PERMANENT,
1543 };
1544
1545 int __init udpv6_init(void)
1546 {
1547 int ret;
1548
1549 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
1550 if (ret)
1551 goto out;
1552
1553 ret = inet6_register_protosw(&udpv6_protosw);
1554 if (ret)
1555 goto out_udpv6_protocol;
1556 out:
1557 return ret;
1558
1559 out_udpv6_protocol:
1560 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1561 goto out;
1562 }
1563
1564 void udpv6_exit(void)
1565 {
1566 inet6_unregister_protosw(&udpv6_protosw);
1567 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1568 }
Linux with added FPC-III support