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vfio/pci: Fix typos in comments
[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/addrconf.h>
41 #include <net/ndisc.h>
42 #include <net/protocol.h>
43 #include <net/transp_v6.h>
44 #include <net/ip6_route.h>
45 #include <net/raw.h>
46 #include <net/tcp_states.h>
47 #include <net/ip6_checksum.h>
48 #include <net/xfrm.h>
49 #include <net/inet6_hashtables.h>
50 #include <net/busy_poll.h>
51 #include <net/sock_reuseport.h>
52
53 #include <linux/proc_fs.h>
54 #include <linux/seq_file.h>
55 #include <trace/events/skb.h>
56 #include "udp_impl.h"
57
58 static u32 udp6_ehashfn(const struct net *net,
59 const struct in6_addr *laddr,
60 const u16 lport,
61 const struct in6_addr *faddr,
62 const __be16 fport)
63 {
64 static u32 udp6_ehash_secret __read_mostly;
65 static u32 udp_ipv6_hash_secret __read_mostly;
66
67 u32 lhash, fhash;
68
69 net_get_random_once(&udp6_ehash_secret,
70 sizeof(udp6_ehash_secret));
71 net_get_random_once(&udp_ipv6_hash_secret,
72 sizeof(udp_ipv6_hash_secret));
73
74 lhash = (__force u32)laddr->s6_addr32[3];
75 fhash = __ipv6_addr_jhash(faddr, udp_ipv6_hash_secret);
76
77 return __inet6_ehashfn(lhash, lport, fhash, fport,
78 udp_ipv6_hash_secret + net_hash_mix(net));
79 }
80
81 static u32 udp6_portaddr_hash(const struct net *net,
82 const struct in6_addr *addr6,
83 unsigned int port)
84 {
85 unsigned int hash, mix = net_hash_mix(net);
86
87 if (ipv6_addr_any(addr6))
88 hash = jhash_1word(0, mix);
89 else if (ipv6_addr_v4mapped(addr6))
90 hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix);
91 else
92 hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix);
93
94 return hash ^ port;
95 }
96
97 int udp_v6_get_port(struct sock *sk, unsigned short snum)
98 {
99 unsigned int hash2_nulladdr =
100 udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum);
101 unsigned int hash2_partial =
102 udp6_portaddr_hash(sock_net(sk), &sk->sk_v6_rcv_saddr, 0);
103
104 /* precompute partial secondary hash */
105 udp_sk(sk)->udp_portaddr_hash = hash2_partial;
106 return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal, hash2_nulladdr);
107 }
108
109 static void udp_v6_rehash(struct sock *sk)
110 {
111 u16 new_hash = udp6_portaddr_hash(sock_net(sk),
112 &sk->sk_v6_rcv_saddr,
113 inet_sk(sk)->inet_num);
114
115 udp_lib_rehash(sk, new_hash);
116 }
117
118 static int compute_score(struct sock *sk, struct net *net,
119 const struct in6_addr *saddr, __be16 sport,
120 const struct in6_addr *daddr, unsigned short hnum,
121 int dif)
122 {
123 int score;
124 struct inet_sock *inet;
125
126 if (!net_eq(sock_net(sk), net) ||
127 udp_sk(sk)->udp_port_hash != hnum ||
128 sk->sk_family != PF_INET6)
129 return -1;
130
131 score = 0;
132 inet = inet_sk(sk);
133
134 if (inet->inet_dport) {
135 if (inet->inet_dport != sport)
136 return -1;
137 score++;
138 }
139
140 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
141 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr))
142 return -1;
143 score++;
144 }
145
146 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
147 if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr))
148 return -1;
149 score++;
150 }
151
152 if (sk->sk_bound_dev_if) {
153 if (sk->sk_bound_dev_if != dif)
154 return -1;
155 score++;
156 }
157
158 if (sk->sk_incoming_cpu == raw_smp_processor_id())
159 score++;
160
161 return score;
162 }
163
164 /* called with rcu_read_lock() */
165 static struct sock *udp6_lib_lookup2(struct net *net,
166 const struct in6_addr *saddr, __be16 sport,
167 const struct in6_addr *daddr, unsigned int hnum, int dif,
168 struct udp_hslot *hslot2,
169 struct sk_buff *skb)
170 {
171 struct sock *sk, *result;
172 int score, badness, matches = 0, reuseport = 0;
173 u32 hash = 0;
174
175 result = NULL;
176 badness = -1;
177 udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) {
178 score = compute_score(sk, net, saddr, sport,
179 daddr, hnum, dif);
180 if (score > badness) {
181 reuseport = sk->sk_reuseport;
182 if (reuseport) {
183 hash = udp6_ehashfn(net, daddr, hnum,
184 saddr, sport);
185
186 result = reuseport_select_sock(sk, hash, skb,
187 sizeof(struct udphdr));
188 if (result)
189 return result;
190 matches = 1;
191 }
192 result = sk;
193 badness = score;
194 } else if (score == badness && reuseport) {
195 matches++;
196 if (reciprocal_scale(hash, matches) == 0)
197 result = sk;
198 hash = next_pseudo_random32(hash);
199 }
200 }
201 return result;
202 }
203
204 /* rcu_read_lock() must be held */
205 struct sock *__udp6_lib_lookup(struct net *net,
206 const struct in6_addr *saddr, __be16 sport,
207 const struct in6_addr *daddr, __be16 dport,
208 int dif, struct udp_table *udptable,
209 struct sk_buff *skb)
210 {
211 struct sock *sk, *result;
212 unsigned short hnum = ntohs(dport);
213 unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask);
214 struct udp_hslot *hslot2, *hslot = &udptable->hash[slot];
215 int score, badness, matches = 0, reuseport = 0;
216 u32 hash = 0;
217
218 if (hslot->count > 10) {
219 hash2 = udp6_portaddr_hash(net, daddr, hnum);
220 slot2 = hash2 & udptable->mask;
221 hslot2 = &udptable->hash2[slot2];
222 if (hslot->count < hslot2->count)
223 goto begin;
224
225 result = udp6_lib_lookup2(net, saddr, sport,
226 daddr, hnum, dif,
227 hslot2, skb);
228 if (!result) {
229 unsigned int old_slot2 = slot2;
230 hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum);
231 slot2 = hash2 & udptable->mask;
232 /* avoid searching the same slot again. */
233 if (unlikely(slot2 == old_slot2))
234 return result;
235
236 hslot2 = &udptable->hash2[slot2];
237 if (hslot->count < hslot2->count)
238 goto begin;
239
240 result = udp6_lib_lookup2(net, saddr, sport,
241 daddr, hnum, dif,
242 hslot2, skb);
243 }
244 return result;
245 }
246 begin:
247 result = NULL;
248 badness = -1;
249 sk_for_each_rcu(sk, &hslot->head) {
250 score = compute_score(sk, net, saddr, sport, daddr, hnum, dif);
251 if (score > badness) {
252 reuseport = sk->sk_reuseport;
253 if (reuseport) {
254 hash = udp6_ehashfn(net, daddr, hnum,
255 saddr, sport);
256 result = reuseport_select_sock(sk, hash, skb,
257 sizeof(struct udphdr));
258 if (result)
259 return result;
260 matches = 1;
261 }
262 result = sk;
263 badness = score;
264 } else if (score == badness && reuseport) {
265 matches++;
266 if (reciprocal_scale(hash, matches) == 0)
267 result = sk;
268 hash = next_pseudo_random32(hash);
269 }
270 }
271 return result;
272 }
273 EXPORT_SYMBOL_GPL(__udp6_lib_lookup);
274
275 static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb,
276 __be16 sport, __be16 dport,
277 struct udp_table *udptable)
278 {
279 const struct ipv6hdr *iph = ipv6_hdr(skb);
280 struct sock *sk;
281
282 sk = skb_steal_sock(skb);
283 if (unlikely(sk))
284 return sk;
285 return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport,
286 &iph->daddr, dport, inet6_iif(skb),
287 udptable, skb);
288 }
289
290 struct sock *udp6_lib_lookup_skb(struct sk_buff *skb,
291 __be16 sport, __be16 dport)
292 {
293 const struct ipv6hdr *iph = ipv6_hdr(skb);
294
295 return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport,
296 &iph->daddr, dport, inet6_iif(skb),
297 &udp_table, skb);
298 }
299 EXPORT_SYMBOL_GPL(udp6_lib_lookup_skb);
300
301 /* Must be called under rcu_read_lock().
302 * Does increment socket refcount.
303 */
304 #if IS_ENABLED(CONFIG_NETFILTER_XT_MATCH_SOCKET) || \
305 IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TPROXY)
306 struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport,
307 const struct in6_addr *daddr, __be16 dport, int dif)
308 {
309 struct sock *sk;
310
311 sk = __udp6_lib_lookup(net, saddr, sport, daddr, dport,
312 dif, &udp_table, NULL);
313 if (sk && !atomic_inc_not_zero(&sk->sk_refcnt))
314 sk = NULL;
315 return sk;
316 }
317 EXPORT_SYMBOL_GPL(udp6_lib_lookup);
318 #endif
319
320 /*
321 * This should be easy, if there is something there we
322 * return it, otherwise we block.
323 */
324
325 int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
326 int noblock, int flags, int *addr_len)
327 {
328 struct ipv6_pinfo *np = inet6_sk(sk);
329 struct inet_sock *inet = inet_sk(sk);
330 struct sk_buff *skb;
331 unsigned int ulen, copied;
332 int peeked, peeking, off;
333 int err;
334 int is_udplite = IS_UDPLITE(sk);
335 bool checksum_valid = false;
336 int is_udp4;
337 bool slow;
338
339 if (flags & MSG_ERRQUEUE)
340 return ipv6_recv_error(sk, msg, len, addr_len);
341
342 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
343 return ipv6_recv_rxpmtu(sk, msg, len, addr_len);
344
345 try_again:
346 peeking = off = sk_peek_offset(sk, flags);
347 skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),
348 &peeked, &off, &err);
349 if (!skb)
350 return err;
351
352 ulen = skb->len;
353 copied = len;
354 if (copied > ulen - off)
355 copied = ulen - off;
356 else if (copied < ulen)
357 msg->msg_flags |= MSG_TRUNC;
358
359 is_udp4 = (skb->protocol == htons(ETH_P_IP));
360
361 /*
362 * If checksum is needed at all, try to do it while copying the
363 * data. If the data is truncated, or if we only want a partial
364 * coverage checksum (UDP-Lite), do it before the copy.
365 */
366
367 if (copied < ulen || UDP_SKB_CB(skb)->partial_cov || peeking) {
368 checksum_valid = !udp_lib_checksum_complete(skb);
369 if (!checksum_valid)
370 goto csum_copy_err;
371 }
372
373 if (checksum_valid || skb_csum_unnecessary(skb))
374 err = skb_copy_datagram_msg(skb, off, msg, copied);
375 else {
376 err = skb_copy_and_csum_datagram_msg(skb, off, msg);
377 if (err == -EINVAL)
378 goto csum_copy_err;
379 }
380 if (unlikely(err)) {
381 trace_kfree_skb(skb, udpv6_recvmsg);
382 if (!peeked) {
383 atomic_inc(&sk->sk_drops);
384 if (is_udp4)
385 UDP_INC_STATS(sock_net(sk), UDP_MIB_INERRORS,
386 is_udplite);
387 else
388 UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS,
389 is_udplite);
390 }
391 skb_free_datagram_locked(sk, skb);
392 return err;
393 }
394 if (!peeked) {
395 if (is_udp4)
396 UDP_INC_STATS(sock_net(sk), UDP_MIB_INDATAGRAMS,
397 is_udplite);
398 else
399 UDP6_INC_STATS(sock_net(sk), UDP_MIB_INDATAGRAMS,
400 is_udplite);
401 }
402
403 sock_recv_ts_and_drops(msg, sk, skb);
404
405 /* Copy the address. */
406 if (msg->msg_name) {
407 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
408 sin6->sin6_family = AF_INET6;
409 sin6->sin6_port = udp_hdr(skb)->source;
410 sin6->sin6_flowinfo = 0;
411
412 if (is_udp4) {
413 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
414 &sin6->sin6_addr);
415 sin6->sin6_scope_id = 0;
416 } else {
417 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
418 sin6->sin6_scope_id =
419 ipv6_iface_scope_id(&sin6->sin6_addr,
420 inet6_iif(skb));
421 }
422 *addr_len = sizeof(*sin6);
423 }
424
425 if (np->rxopt.all)
426 ip6_datagram_recv_common_ctl(sk, msg, skb);
427
428 if (is_udp4) {
429 if (inet->cmsg_flags)
430 ip_cmsg_recv(msg, skb);
431 } else {
432 if (np->rxopt.all)
433 ip6_datagram_recv_specific_ctl(sk, msg, skb);
434 }
435
436 err = copied;
437 if (flags & MSG_TRUNC)
438 err = ulen;
439
440 __skb_free_datagram_locked(sk, skb, peeking ? -err : err);
441 return err;
442
443 csum_copy_err:
444 slow = lock_sock_fast(sk);
445 if (!skb_kill_datagram(sk, skb, flags)) {
446 if (is_udp4) {
447 UDP_INC_STATS(sock_net(sk),
448 UDP_MIB_CSUMERRORS, is_udplite);
449 UDP_INC_STATS(sock_net(sk),
450 UDP_MIB_INERRORS, is_udplite);
451 } else {
452 UDP6_INC_STATS(sock_net(sk),
453 UDP_MIB_CSUMERRORS, is_udplite);
454 UDP6_INC_STATS(sock_net(sk),
455 UDP_MIB_INERRORS, is_udplite);
456 }
457 }
458 unlock_sock_fast(sk, slow);
459
460 /* starting over for a new packet, but check if we need to yield */
461 cond_resched();
462 msg->msg_flags &= ~MSG_TRUNC;
463 goto try_again;
464 }
465
466 void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
467 u8 type, u8 code, int offset, __be32 info,
468 struct udp_table *udptable)
469 {
470 struct ipv6_pinfo *np;
471 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
472 const struct in6_addr *saddr = &hdr->saddr;
473 const struct in6_addr *daddr = &hdr->daddr;
474 struct udphdr *uh = (struct udphdr *)(skb->data+offset);
475 struct sock *sk;
476 int harderr;
477 int err;
478 struct net *net = dev_net(skb->dev);
479
480 sk = __udp6_lib_lookup(net, daddr, uh->dest, saddr, uh->source,
481 inet6_iif(skb), udptable, skb);
482 if (!sk) {
483 __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev),
484 ICMP6_MIB_INERRORS);
485 return;
486 }
487
488 harderr = icmpv6_err_convert(type, code, &err);
489 np = inet6_sk(sk);
490
491 if (type == ICMPV6_PKT_TOOBIG) {
492 if (!ip6_sk_accept_pmtu(sk))
493 goto out;
494 ip6_sk_update_pmtu(skb, sk, info);
495 if (np->pmtudisc != IPV6_PMTUDISC_DONT)
496 harderr = 1;
497 }
498 if (type == NDISC_REDIRECT) {
499 ip6_sk_redirect(skb, sk);
500 goto out;
501 }
502
503 if (!np->recverr) {
504 if (!harderr || sk->sk_state != TCP_ESTABLISHED)
505 goto out;
506 } else {
507 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
508 }
509
510 sk->sk_err = err;
511 sk->sk_error_report(sk);
512 out:
513 return;
514 }
515
516 static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
517 {
518 int rc;
519
520 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
521 sock_rps_save_rxhash(sk, skb);
522 sk_mark_napi_id(sk, skb);
523 sk_incoming_cpu_update(sk);
524 }
525
526 rc = __sock_queue_rcv_skb(sk, skb);
527 if (rc < 0) {
528 int is_udplite = IS_UDPLITE(sk);
529
530 /* Note that an ENOMEM error is charged twice */
531 if (rc == -ENOMEM)
532 UDP6_INC_STATS(sock_net(sk),
533 UDP_MIB_RCVBUFERRORS, is_udplite);
534 UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
535 kfree_skb(skb);
536 return -1;
537 }
538 return 0;
539 }
540
541 static __inline__ void udpv6_err(struct sk_buff *skb,
542 struct inet6_skb_parm *opt, u8 type,
543 u8 code, int offset, __be32 info)
544 {
545 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table);
546 }
547
548 static struct static_key udpv6_encap_needed __read_mostly;
549 void udpv6_encap_enable(void)
550 {
551 if (!static_key_enabled(&udpv6_encap_needed))
552 static_key_slow_inc(&udpv6_encap_needed);
553 }
554 EXPORT_SYMBOL(udpv6_encap_enable);
555
556 int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
557 {
558 struct udp_sock *up = udp_sk(sk);
559 int rc;
560 int is_udplite = IS_UDPLITE(sk);
561
562 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
563 goto drop;
564
565 if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
566 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
567
568 /*
569 * This is an encapsulation socket so pass the skb to
570 * the socket's udp_encap_rcv() hook. Otherwise, just
571 * fall through and pass this up the UDP socket.
572 * up->encap_rcv() returns the following value:
573 * =0 if skb was successfully passed to the encap
574 * handler or was discarded by it.
575 * >0 if skb should be passed on to UDP.
576 * <0 if skb should be resubmitted as proto -N
577 */
578
579 /* if we're overly short, let UDP handle it */
580 encap_rcv = ACCESS_ONCE(up->encap_rcv);
581 if (encap_rcv) {
582 int ret;
583
584 /* Verify checksum before giving to encap */
585 if (udp_lib_checksum_complete(skb))
586 goto csum_error;
587
588 ret = encap_rcv(sk, skb);
589 if (ret <= 0) {
590 __UDP_INC_STATS(sock_net(sk),
591 UDP_MIB_INDATAGRAMS,
592 is_udplite);
593 return -ret;
594 }
595 }
596
597 /* FALLTHROUGH -- it's a UDP Packet */
598 }
599
600 /*
601 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
602 */
603 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
604
605 if (up->pcrlen == 0) { /* full coverage was set */
606 net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n",
607 UDP_SKB_CB(skb)->cscov, skb->len);
608 goto drop;
609 }
610 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
611 net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n",
612 UDP_SKB_CB(skb)->cscov, up->pcrlen);
613 goto drop;
614 }
615 }
616
617 if (rcu_access_pointer(sk->sk_filter) &&
618 udp_lib_checksum_complete(skb))
619 goto csum_error;
620
621 if (sk_filter_trim_cap(sk, skb, sizeof(struct udphdr)))
622 goto drop;
623
624 udp_csum_pull_header(skb);
625 if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
626 __UDP6_INC_STATS(sock_net(sk),
627 UDP_MIB_RCVBUFERRORS, is_udplite);
628 goto drop;
629 }
630
631 skb_dst_drop(skb);
632
633 bh_lock_sock(sk);
634 rc = 0;
635 if (!sock_owned_by_user(sk))
636 rc = __udpv6_queue_rcv_skb(sk, skb);
637 else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
638 bh_unlock_sock(sk);
639 goto drop;
640 }
641 bh_unlock_sock(sk);
642
643 return rc;
644
645 csum_error:
646 __UDP6_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite);
647 drop:
648 __UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
649 atomic_inc(&sk->sk_drops);
650 kfree_skb(skb);
651 return -1;
652 }
653
654 static bool __udp_v6_is_mcast_sock(struct net *net, struct sock *sk,
655 __be16 loc_port, const struct in6_addr *loc_addr,
656 __be16 rmt_port, const struct in6_addr *rmt_addr,
657 int dif, unsigned short hnum)
658 {
659 struct inet_sock *inet = inet_sk(sk);
660
661 if (!net_eq(sock_net(sk), net))
662 return false;
663
664 if (udp_sk(sk)->udp_port_hash != hnum ||
665 sk->sk_family != PF_INET6 ||
666 (inet->inet_dport && inet->inet_dport != rmt_port) ||
667 (!ipv6_addr_any(&sk->sk_v6_daddr) &&
668 !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) ||
669 (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif) ||
670 (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) &&
671 !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr)))
672 return false;
673 if (!inet6_mc_check(sk, loc_addr, rmt_addr))
674 return false;
675 return true;
676 }
677
678 static void udp6_csum_zero_error(struct sk_buff *skb)
679 {
680 /* RFC 2460 section 8.1 says that we SHOULD log
681 * this error. Well, it is reasonable.
682 */
683 net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n",
684 &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source),
685 &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest));
686 }
687
688 /*
689 * Note: called only from the BH handler context,
690 * so we don't need to lock the hashes.
691 */
692 static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
693 const struct in6_addr *saddr, const struct in6_addr *daddr,
694 struct udp_table *udptable, int proto)
695 {
696 struct sock *sk, *first = NULL;
697 const struct udphdr *uh = udp_hdr(skb);
698 unsigned short hnum = ntohs(uh->dest);
699 struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum);
700 unsigned int offset = offsetof(typeof(*sk), sk_node);
701 unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10);
702 int dif = inet6_iif(skb);
703 struct hlist_node *node;
704 struct sk_buff *nskb;
705
706 if (use_hash2) {
707 hash2_any = udp6_portaddr_hash(net, &in6addr_any, hnum) &
708 udp_table.mask;
709 hash2 = udp6_portaddr_hash(net, daddr, hnum) & udp_table.mask;
710 start_lookup:
711 hslot = &udp_table.hash2[hash2];
712 offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node);
713 }
714
715 sk_for_each_entry_offset_rcu(sk, node, &hslot->head, offset) {
716 if (!__udp_v6_is_mcast_sock(net, sk, uh->dest, daddr,
717 uh->source, saddr, dif, hnum))
718 continue;
719 /* If zero checksum and no_check is not on for
720 * the socket then skip it.
721 */
722 if (!uh->check && !udp_sk(sk)->no_check6_rx)
723 continue;
724 if (!first) {
725 first = sk;
726 continue;
727 }
728 nskb = skb_clone(skb, GFP_ATOMIC);
729 if (unlikely(!nskb)) {
730 atomic_inc(&sk->sk_drops);
731 __UDP6_INC_STATS(net, UDP_MIB_RCVBUFERRORS,
732 IS_UDPLITE(sk));
733 __UDP6_INC_STATS(net, UDP_MIB_INERRORS,
734 IS_UDPLITE(sk));
735 continue;
736 }
737
738 if (udpv6_queue_rcv_skb(sk, nskb) > 0)
739 consume_skb(nskb);
740 }
741
742 /* Also lookup *:port if we are using hash2 and haven't done so yet. */
743 if (use_hash2 && hash2 != hash2_any) {
744 hash2 = hash2_any;
745 goto start_lookup;
746 }
747
748 if (first) {
749 if (udpv6_queue_rcv_skb(first, skb) > 0)
750 consume_skb(skb);
751 } else {
752 kfree_skb(skb);
753 __UDP6_INC_STATS(net, UDP_MIB_IGNOREDMULTI,
754 proto == IPPROTO_UDPLITE);
755 }
756 return 0;
757 }
758
759 int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
760 int proto)
761 {
762 const struct in6_addr *saddr, *daddr;
763 struct net *net = dev_net(skb->dev);
764 struct udphdr *uh;
765 struct sock *sk;
766 u32 ulen = 0;
767
768 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
769 goto discard;
770
771 saddr = &ipv6_hdr(skb)->saddr;
772 daddr = &ipv6_hdr(skb)->daddr;
773 uh = udp_hdr(skb);
774
775 ulen = ntohs(uh->len);
776 if (ulen > skb->len)
777 goto short_packet;
778
779 if (proto == IPPROTO_UDP) {
780 /* UDP validates ulen. */
781
782 /* Check for jumbo payload */
783 if (ulen == 0)
784 ulen = skb->len;
785
786 if (ulen < sizeof(*uh))
787 goto short_packet;
788
789 if (ulen < skb->len) {
790 if (pskb_trim_rcsum(skb, ulen))
791 goto short_packet;
792 saddr = &ipv6_hdr(skb)->saddr;
793 daddr = &ipv6_hdr(skb)->daddr;
794 uh = udp_hdr(skb);
795 }
796 }
797
798 if (udp6_csum_init(skb, uh, proto))
799 goto csum_error;
800
801 /*
802 * Multicast receive code
803 */
804 if (ipv6_addr_is_multicast(daddr))
805 return __udp6_lib_mcast_deliver(net, skb,
806 saddr, daddr, udptable, proto);
807
808 /* Unicast */
809
810 /*
811 * check socket cache ... must talk to Alan about his plans
812 * for sock caches... i'll skip this for now.
813 */
814 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
815 if (sk) {
816 int ret;
817
818 if (!uh->check && !udp_sk(sk)->no_check6_rx) {
819 udp6_csum_zero_error(skb);
820 goto csum_error;
821 }
822
823 if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk))
824 skb_checksum_try_convert(skb, IPPROTO_UDP, uh->check,
825 ip6_compute_pseudo);
826
827 ret = udpv6_queue_rcv_skb(sk, skb);
828
829 /* a return value > 0 means to resubmit the input */
830 if (ret > 0)
831 return ret;
832
833 return 0;
834 }
835
836 if (!uh->check) {
837 udp6_csum_zero_error(skb);
838 goto csum_error;
839 }
840
841 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
842 goto discard;
843
844 if (udp_lib_checksum_complete(skb))
845 goto csum_error;
846
847 __UDP6_INC_STATS(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
848 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
849
850 kfree_skb(skb);
851 return 0;
852
853 short_packet:
854 net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n",
855 proto == IPPROTO_UDPLITE ? "-Lite" : "",
856 saddr, ntohs(uh->source),
857 ulen, skb->len,
858 daddr, ntohs(uh->dest));
859 goto discard;
860 csum_error:
861 __UDP6_INC_STATS(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE);
862 discard:
863 __UDP6_INC_STATS(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
864 kfree_skb(skb);
865 return 0;
866 }
867
868 static __inline__ int udpv6_rcv(struct sk_buff *skb)
869 {
870 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP);
871 }
872
873 /*
874 * Throw away all pending data and cancel the corking. Socket is locked.
875 */
876 static void udp_v6_flush_pending_frames(struct sock *sk)
877 {
878 struct udp_sock *up = udp_sk(sk);
879
880 if (up->pending == AF_INET)
881 udp_flush_pending_frames(sk);
882 else if (up->pending) {
883 up->len = 0;
884 up->pending = 0;
885 ip6_flush_pending_frames(sk);
886 }
887 }
888
889 /**
890 * udp6_hwcsum_outgoing - handle outgoing HW checksumming
891 * @sk: socket we are sending on
892 * @skb: sk_buff containing the filled-in UDP header
893 * (checksum field must be zeroed out)
894 */
895 static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
896 const struct in6_addr *saddr,
897 const struct in6_addr *daddr, int len)
898 {
899 unsigned int offset;
900 struct udphdr *uh = udp_hdr(skb);
901 struct sk_buff *frags = skb_shinfo(skb)->frag_list;
902 __wsum csum = 0;
903
904 if (!frags) {
905 /* Only one fragment on the socket. */
906 skb->csum_start = skb_transport_header(skb) - skb->head;
907 skb->csum_offset = offsetof(struct udphdr, check);
908 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0);
909 } else {
910 /*
911 * HW-checksum won't work as there are two or more
912 * fragments on the socket so that all csums of sk_buffs
913 * should be together
914 */
915 offset = skb_transport_offset(skb);
916 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
917
918 skb->ip_summed = CHECKSUM_NONE;
919
920 do {
921 csum = csum_add(csum, frags->csum);
922 } while ((frags = frags->next));
923
924 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP,
925 csum);
926 if (uh->check == 0)
927 uh->check = CSUM_MANGLED_0;
928 }
929 }
930
931 /*
932 * Sending
933 */
934
935 static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6)
936 {
937 struct sock *sk = skb->sk;
938 struct udphdr *uh;
939 int err = 0;
940 int is_udplite = IS_UDPLITE(sk);
941 __wsum csum = 0;
942 int offset = skb_transport_offset(skb);
943 int len = skb->len - offset;
944
945 /*
946 * Create a UDP header
947 */
948 uh = udp_hdr(skb);
949 uh->source = fl6->fl6_sport;
950 uh->dest = fl6->fl6_dport;
951 uh->len = htons(len);
952 uh->check = 0;
953
954 if (is_udplite)
955 csum = udplite_csum(skb);
956 else if (udp_sk(sk)->no_check6_tx) { /* UDP csum disabled */
957 skb->ip_summed = CHECKSUM_NONE;
958 goto send;
959 } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
960 udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, len);
961 goto send;
962 } else
963 csum = udp_csum(skb);
964
965 /* add protocol-dependent pseudo-header */
966 uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
967 len, fl6->flowi6_proto, csum);
968 if (uh->check == 0)
969 uh->check = CSUM_MANGLED_0;
970
971 send:
972 err = ip6_send_skb(skb);
973 if (err) {
974 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) {
975 UDP6_INC_STATS(sock_net(sk),
976 UDP_MIB_SNDBUFERRORS, is_udplite);
977 err = 0;
978 }
979 } else {
980 UDP6_INC_STATS(sock_net(sk),
981 UDP_MIB_OUTDATAGRAMS, is_udplite);
982 }
983 return err;
984 }
985
986 static int udp_v6_push_pending_frames(struct sock *sk)
987 {
988 struct sk_buff *skb;
989 struct udp_sock *up = udp_sk(sk);
990 struct flowi6 fl6;
991 int err = 0;
992
993 if (up->pending == AF_INET)
994 return udp_push_pending_frames(sk);
995
996 /* ip6_finish_skb will release the cork, so make a copy of
997 * fl6 here.
998 */
999 fl6 = inet_sk(sk)->cork.fl.u.ip6;
1000
1001 skb = ip6_finish_skb(sk);
1002 if (!skb)
1003 goto out;
1004
1005 err = udp_v6_send_skb(skb, &fl6);
1006
1007 out:
1008 up->len = 0;
1009 up->pending = 0;
1010 return err;
1011 }
1012
1013 int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
1014 {
1015 struct ipv6_txoptions opt_space;
1016 struct udp_sock *up = udp_sk(sk);
1017 struct inet_sock *inet = inet_sk(sk);
1018 struct ipv6_pinfo *np = inet6_sk(sk);
1019 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
1020 struct in6_addr *daddr, *final_p, final;
1021 struct ipv6_txoptions *opt = NULL;
1022 struct ipv6_txoptions *opt_to_free = NULL;
1023 struct ip6_flowlabel *flowlabel = NULL;
1024 struct flowi6 fl6;
1025 struct dst_entry *dst;
1026 struct ipcm6_cookie ipc6;
1027 int addr_len = msg->msg_namelen;
1028 int ulen = len;
1029 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
1030 int err;
1031 int connected = 0;
1032 int is_udplite = IS_UDPLITE(sk);
1033 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
1034 struct sockcm_cookie sockc;
1035
1036 ipc6.hlimit = -1;
1037 ipc6.tclass = -1;
1038 ipc6.dontfrag = -1;
1039
1040 /* destination address check */
1041 if (sin6) {
1042 if (addr_len < offsetof(struct sockaddr, sa_data))
1043 return -EINVAL;
1044
1045 switch (sin6->sin6_family) {
1046 case AF_INET6:
1047 if (addr_len < SIN6_LEN_RFC2133)
1048 return -EINVAL;
1049 daddr = &sin6->sin6_addr;
1050 break;
1051 case AF_INET:
1052 goto do_udp_sendmsg;
1053 case AF_UNSPEC:
1054 msg->msg_name = sin6 = NULL;
1055 msg->msg_namelen = addr_len = 0;
1056 daddr = NULL;
1057 break;
1058 default:
1059 return -EINVAL;
1060 }
1061 } else if (!up->pending) {
1062 if (sk->sk_state != TCP_ESTABLISHED)
1063 return -EDESTADDRREQ;
1064 daddr = &sk->sk_v6_daddr;
1065 } else
1066 daddr = NULL;
1067
1068 if (daddr) {
1069 if (ipv6_addr_v4mapped(daddr)) {
1070 struct sockaddr_in sin;
1071 sin.sin_family = AF_INET;
1072 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport;
1073 sin.sin_addr.s_addr = daddr->s6_addr32[3];
1074 msg->msg_name = &sin;
1075 msg->msg_namelen = sizeof(sin);
1076 do_udp_sendmsg:
1077 if (__ipv6_only_sock(sk))
1078 return -ENETUNREACH;
1079 return udp_sendmsg(sk, msg, len);
1080 }
1081 }
1082
1083 if (up->pending == AF_INET)
1084 return udp_sendmsg(sk, msg, len);
1085
1086 /* Rough check on arithmetic overflow,
1087 better check is made in ip6_append_data().
1088 */
1089 if (len > INT_MAX - sizeof(struct udphdr))
1090 return -EMSGSIZE;
1091
1092 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
1093 if (up->pending) {
1094 /*
1095 * There are pending frames.
1096 * The socket lock must be held while it's corked.
1097 */
1098 lock_sock(sk);
1099 if (likely(up->pending)) {
1100 if (unlikely(up->pending != AF_INET6)) {
1101 release_sock(sk);
1102 return -EAFNOSUPPORT;
1103 }
1104 dst = NULL;
1105 goto do_append_data;
1106 }
1107 release_sock(sk);
1108 }
1109 ulen += sizeof(struct udphdr);
1110
1111 memset(&fl6, 0, sizeof(fl6));
1112
1113 if (sin6) {
1114 if (sin6->sin6_port == 0)
1115 return -EINVAL;
1116
1117 fl6.fl6_dport = sin6->sin6_port;
1118 daddr = &sin6->sin6_addr;
1119
1120 if (np->sndflow) {
1121 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
1122 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
1123 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1124 if (!flowlabel)
1125 return -EINVAL;
1126 }
1127 }
1128
1129 /*
1130 * Otherwise it will be difficult to maintain
1131 * sk->sk_dst_cache.
1132 */
1133 if (sk->sk_state == TCP_ESTABLISHED &&
1134 ipv6_addr_equal(daddr, &sk->sk_v6_daddr))
1135 daddr = &sk->sk_v6_daddr;
1136
1137 if (addr_len >= sizeof(struct sockaddr_in6) &&
1138 sin6->sin6_scope_id &&
1139 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
1140 fl6.flowi6_oif = sin6->sin6_scope_id;
1141 } else {
1142 if (sk->sk_state != TCP_ESTABLISHED)
1143 return -EDESTADDRREQ;
1144
1145 fl6.fl6_dport = inet->inet_dport;
1146 daddr = &sk->sk_v6_daddr;
1147 fl6.flowlabel = np->flow_label;
1148 connected = 1;
1149 }
1150
1151 if (!fl6.flowi6_oif)
1152 fl6.flowi6_oif = sk->sk_bound_dev_if;
1153
1154 if (!fl6.flowi6_oif)
1155 fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex;
1156
1157 fl6.flowi6_mark = sk->sk_mark;
1158 sockc.tsflags = sk->sk_tsflags;
1159
1160 if (msg->msg_controllen) {
1161 opt = &opt_space;
1162 memset(opt, 0, sizeof(struct ipv6_txoptions));
1163 opt->tot_len = sizeof(*opt);
1164 ipc6.opt = opt;
1165
1166 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, &ipc6, &sockc);
1167 if (err < 0) {
1168 fl6_sock_release(flowlabel);
1169 return err;
1170 }
1171 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
1172 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1173 if (!flowlabel)
1174 return -EINVAL;
1175 }
1176 if (!(opt->opt_nflen|opt->opt_flen))
1177 opt = NULL;
1178 connected = 0;
1179 }
1180 if (!opt) {
1181 opt = txopt_get(np);
1182 opt_to_free = opt;
1183 }
1184 if (flowlabel)
1185 opt = fl6_merge_options(&opt_space, flowlabel, opt);
1186 opt = ipv6_fixup_options(&opt_space, opt);
1187 ipc6.opt = opt;
1188
1189 fl6.flowi6_proto = sk->sk_protocol;
1190 if (!ipv6_addr_any(daddr))
1191 fl6.daddr = *daddr;
1192 else
1193 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
1194 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
1195 fl6.saddr = np->saddr;
1196 fl6.fl6_sport = inet->inet_sport;
1197
1198 final_p = fl6_update_dst(&fl6, opt, &final);
1199 if (final_p)
1200 connected = 0;
1201
1202 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) {
1203 fl6.flowi6_oif = np->mcast_oif;
1204 connected = 0;
1205 } else if (!fl6.flowi6_oif)
1206 fl6.flowi6_oif = np->ucast_oif;
1207
1208 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
1209
1210 if (ipc6.tclass < 0)
1211 ipc6.tclass = np->tclass;
1212
1213 fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel);
1214
1215 dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p);
1216 if (IS_ERR(dst)) {
1217 err = PTR_ERR(dst);
1218 dst = NULL;
1219 goto out;
1220 }
1221
1222 if (ipc6.hlimit < 0)
1223 ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
1224
1225 if (msg->msg_flags&MSG_CONFIRM)
1226 goto do_confirm;
1227 back_from_confirm:
1228
1229 /* Lockless fast path for the non-corking case */
1230 if (!corkreq) {
1231 struct sk_buff *skb;
1232
1233 skb = ip6_make_skb(sk, getfrag, msg, ulen,
1234 sizeof(struct udphdr), &ipc6,
1235 &fl6, (struct rt6_info *)dst,
1236 msg->msg_flags, &sockc);
1237 err = PTR_ERR(skb);
1238 if (!IS_ERR_OR_NULL(skb))
1239 err = udp_v6_send_skb(skb, &fl6);
1240 goto release_dst;
1241 }
1242
1243 lock_sock(sk);
1244 if (unlikely(up->pending)) {
1245 /* The socket is already corked while preparing it. */
1246 /* ... which is an evident application bug. --ANK */
1247 release_sock(sk);
1248
1249 net_dbg_ratelimited("udp cork app bug 2\n");
1250 err = -EINVAL;
1251 goto out;
1252 }
1253
1254 up->pending = AF_INET6;
1255
1256 do_append_data:
1257 if (ipc6.dontfrag < 0)
1258 ipc6.dontfrag = np->dontfrag;
1259 up->len += ulen;
1260 err = ip6_append_data(sk, getfrag, msg, ulen, sizeof(struct udphdr),
1261 &ipc6, &fl6, (struct rt6_info *)dst,
1262 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, &sockc);
1263 if (err)
1264 udp_v6_flush_pending_frames(sk);
1265 else if (!corkreq)
1266 err = udp_v6_push_pending_frames(sk);
1267 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
1268 up->pending = 0;
1269
1270 if (err > 0)
1271 err = np->recverr ? net_xmit_errno(err) : 0;
1272 release_sock(sk);
1273
1274 release_dst:
1275 if (dst) {
1276 if (connected) {
1277 ip6_dst_store(sk, dst,
1278 ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ?
1279 &sk->sk_v6_daddr : NULL,
1280 #ifdef CONFIG_IPV6_SUBTREES
1281 ipv6_addr_equal(&fl6.saddr, &np->saddr) ?
1282 &np->saddr :
1283 #endif
1284 NULL);
1285 } else {
1286 dst_release(dst);
1287 }
1288 dst = NULL;
1289 }
1290
1291 out:
1292 dst_release(dst);
1293 fl6_sock_release(flowlabel);
1294 txopt_put(opt_to_free);
1295 if (!err)
1296 return len;
1297 /*
1298 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
1299 * ENOBUFS might not be good (it's not tunable per se), but otherwise
1300 * we don't have a good statistic (IpOutDiscards but it can be too many
1301 * things). We could add another new stat but at least for now that
1302 * seems like overkill.
1303 */
1304 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
1305 UDP6_INC_STATS(sock_net(sk),
1306 UDP_MIB_SNDBUFERRORS, is_udplite);
1307 }
1308 return err;
1309
1310 do_confirm:
1311 dst_confirm(dst);
1312 if (!(msg->msg_flags&MSG_PROBE) || len)
1313 goto back_from_confirm;
1314 err = 0;
1315 goto out;
1316 }
1317
1318 void udpv6_destroy_sock(struct sock *sk)
1319 {
1320 struct udp_sock *up = udp_sk(sk);
1321 lock_sock(sk);
1322 udp_v6_flush_pending_frames(sk);
1323 release_sock(sk);
1324
1325 if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
1326 void (*encap_destroy)(struct sock *sk);
1327 encap_destroy = ACCESS_ONCE(up->encap_destroy);
1328 if (encap_destroy)
1329 encap_destroy(sk);
1330 }
1331
1332 inet6_destroy_sock(sk);
1333 }
1334
1335 /*
1336 * Socket option code for UDP
1337 */
1338 int udpv6_setsockopt(struct sock *sk, int level, int optname,
1339 char __user *optval, unsigned int optlen)
1340 {
1341 if (level == SOL_UDP || level == SOL_UDPLITE)
1342 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1343 udp_v6_push_pending_frames);
1344 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1345 }
1346
1347 #ifdef CONFIG_COMPAT
1348 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
1349 char __user *optval, unsigned int optlen)
1350 {
1351 if (level == SOL_UDP || level == SOL_UDPLITE)
1352 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1353 udp_v6_push_pending_frames);
1354 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
1355 }
1356 #endif
1357
1358 int udpv6_getsockopt(struct sock *sk, int level, int optname,
1359 char __user *optval, int __user *optlen)
1360 {
1361 if (level == SOL_UDP || level == SOL_UDPLITE)
1362 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1363 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1364 }
1365
1366 #ifdef CONFIG_COMPAT
1367 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
1368 char __user *optval, int __user *optlen)
1369 {
1370 if (level == SOL_UDP || level == SOL_UDPLITE)
1371 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1372 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
1373 }
1374 #endif
1375
1376 static const struct inet6_protocol udpv6_protocol = {
1377 .handler = udpv6_rcv,
1378 .err_handler = udpv6_err,
1379 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1380 };
1381
1382 /* ------------------------------------------------------------------------ */
1383 #ifdef CONFIG_PROC_FS
1384 int udp6_seq_show(struct seq_file *seq, void *v)
1385 {
1386 if (v == SEQ_START_TOKEN) {
1387 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
1388 } else {
1389 int bucket = ((struct udp_iter_state *)seq->private)->bucket;
1390 struct inet_sock *inet = inet_sk(v);
1391 __u16 srcp = ntohs(inet->inet_sport);
1392 __u16 destp = ntohs(inet->inet_dport);
1393 ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket);
1394 }
1395 return 0;
1396 }
1397
1398 static const struct file_operations udp6_afinfo_seq_fops = {
1399 .owner = THIS_MODULE,
1400 .open = udp_seq_open,
1401 .read = seq_read,
1402 .llseek = seq_lseek,
1403 .release = seq_release_net
1404 };
1405
1406 static struct udp_seq_afinfo udp6_seq_afinfo = {
1407 .name = "udp6",
1408 .family = AF_INET6,
1409 .udp_table = &udp_table,
1410 .seq_fops = &udp6_afinfo_seq_fops,
1411 .seq_ops = {
1412 .show = udp6_seq_show,
1413 },
1414 };
1415
1416 int __net_init udp6_proc_init(struct net *net)
1417 {
1418 return udp_proc_register(net, &udp6_seq_afinfo);
1419 }
1420
1421 void udp6_proc_exit(struct net *net)
1422 {
1423 udp_proc_unregister(net, &udp6_seq_afinfo);
1424 }
1425 #endif /* CONFIG_PROC_FS */
1426
1427 void udp_v6_clear_sk(struct sock *sk, int size)
1428 {
1429 struct inet_sock *inet = inet_sk(sk);
1430
1431 /* we do not want to clear pinet6 field, because of RCU lookups */
1432 sk_prot_clear_portaddr_nulls(sk, offsetof(struct inet_sock, pinet6));
1433
1434 size -= offsetof(struct inet_sock, pinet6) + sizeof(inet->pinet6);
1435 memset(&inet->pinet6 + 1, 0, size);
1436 }
1437
1438 /* ------------------------------------------------------------------------ */
1439
1440 struct proto udpv6_prot = {
1441 .name = "UDPv6",
1442 .owner = THIS_MODULE,
1443 .close = udp_lib_close,
1444 .connect = ip6_datagram_connect,
1445 .disconnect = udp_disconnect,
1446 .ioctl = udp_ioctl,
1447 .destroy = udpv6_destroy_sock,
1448 .setsockopt = udpv6_setsockopt,
1449 .getsockopt = udpv6_getsockopt,
1450 .sendmsg = udpv6_sendmsg,
1451 .recvmsg = udpv6_recvmsg,
1452 .backlog_rcv = __udpv6_queue_rcv_skb,
1453 .release_cb = ip6_datagram_release_cb,
1454 .hash = udp_lib_hash,
1455 .unhash = udp_lib_unhash,
1456 .rehash = udp_v6_rehash,
1457 .get_port = udp_v6_get_port,
1458 .memory_allocated = &udp_memory_allocated,
1459 .sysctl_mem = sysctl_udp_mem,
1460 .sysctl_wmem = &sysctl_udp_wmem_min,
1461 .sysctl_rmem = &sysctl_udp_rmem_min,
1462 .obj_size = sizeof(struct udp6_sock),
1463 .slab_flags = SLAB_DESTROY_BY_RCU,
1464 .h.udp_table = &udp_table,
1465 #ifdef CONFIG_COMPAT
1466 .compat_setsockopt = compat_udpv6_setsockopt,
1467 .compat_getsockopt = compat_udpv6_getsockopt,
1468 #endif
1469 .clear_sk = udp_v6_clear_sk,
1470 };
1471
1472 static struct inet_protosw udpv6_protosw = {
1473 .type = SOCK_DGRAM,
1474 .protocol = IPPROTO_UDP,
1475 .prot = &udpv6_prot,
1476 .ops = &inet6_dgram_ops,
1477 .flags = INET_PROTOSW_PERMANENT,
1478 };
1479
1480 int __init udpv6_init(void)
1481 {
1482 int ret;
1483
1484 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
1485 if (ret)
1486 goto out;
1487
1488 ret = inet6_register_protosw(&udpv6_protosw);
1489 if (ret)
1490 goto out_udpv6_protocol;
1491 out:
1492 return ret;
1493
1494 out_udpv6_protocol:
1495 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1496 goto out;
1497 }
1498
1499 void udpv6_exit(void)
1500 {
1501 inet6_unregister_protosw(&udpv6_protosw);
1502 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1503 }
Linux kernel - Deliverables
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