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ipv6: udp: Optimise multicast reception
[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 <asm/uaccess.h>
38
39 #include <net/ndisc.h>
40 #include <net/protocol.h>
41 #include <net/transp_v6.h>
42 #include <net/ip6_route.h>
43 #include <net/raw.h>
44 #include <net/tcp_states.h>
45 #include <net/ip6_checksum.h>
46 #include <net/xfrm.h>
47
48 #include <linux/proc_fs.h>
49 #include <linux/seq_file.h>
50 #include "udp_impl.h"
51
52 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
53 {
54 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
55 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
56 __be32 sk1_rcv_saddr = inet_sk(sk)->inet_rcv_saddr;
57 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
58 int sk_ipv6only = ipv6_only_sock(sk);
59 int sk2_ipv6only = inet_v6_ipv6only(sk2);
60 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
61 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
62
63 /* if both are mapped, treat as IPv4 */
64 if (addr_type == IPV6_ADDR_MAPPED && addr_type2 == IPV6_ADDR_MAPPED)
65 return (!sk2_ipv6only &&
66 (!sk1_rcv_saddr || !sk2_rcv_saddr ||
67 sk1_rcv_saddr == sk2_rcv_saddr));
68
69 if (addr_type2 == IPV6_ADDR_ANY &&
70 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
71 return 1;
72
73 if (addr_type == IPV6_ADDR_ANY &&
74 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
75 return 1;
76
77 if (sk2_rcv_saddr6 &&
78 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
79 return 1;
80
81 return 0;
82 }
83
84 static unsigned int udp6_portaddr_hash(struct net *net,
85 const struct in6_addr *addr6,
86 unsigned int port)
87 {
88 unsigned int hash, mix = net_hash_mix(net);
89
90 if (ipv6_addr_any(addr6))
91 hash = jhash_1word(0, mix);
92 else if (ipv6_addr_type(addr6) == IPV6_ADDR_MAPPED)
93 hash = jhash_1word(addr6->s6_addr32[3], mix);
94 else
95 hash = jhash2(addr6->s6_addr32, 4, mix);
96
97 return hash ^ port;
98 }
99
100
101 int udp_v6_get_port(struct sock *sk, unsigned short snum)
102 {
103 /* precompute partial secondary hash */
104 udp_sk(sk)->udp_portaddr_hash =
105 udp6_portaddr_hash(sock_net(sk),
106 &inet6_sk(sk)->rcv_saddr,
107 0);
108 return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal);
109 }
110
111 static inline int compute_score(struct sock *sk, struct net *net,
112 unsigned short hnum,
113 struct in6_addr *saddr, __be16 sport,
114 struct in6_addr *daddr, __be16 dport,
115 int dif)
116 {
117 int score = -1;
118
119 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum &&
120 sk->sk_family == PF_INET6) {
121 struct ipv6_pinfo *np = inet6_sk(sk);
122 struct inet_sock *inet = inet_sk(sk);
123
124 score = 0;
125 if (inet->inet_dport) {
126 if (inet->inet_dport != sport)
127 return -1;
128 score++;
129 }
130 if (!ipv6_addr_any(&np->rcv_saddr)) {
131 if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
132 return -1;
133 score++;
134 }
135 if (!ipv6_addr_any(&np->daddr)) {
136 if (!ipv6_addr_equal(&np->daddr, saddr))
137 return -1;
138 score++;
139 }
140 if (sk->sk_bound_dev_if) {
141 if (sk->sk_bound_dev_if != dif)
142 return -1;
143 score++;
144 }
145 }
146 return score;
147 }
148
149 #define SCORE2_MAX (1 + 1 + 1)
150 static inline int compute_score2(struct sock *sk, struct net *net,
151 const struct in6_addr *saddr, __be16 sport,
152 const struct in6_addr *daddr, unsigned short hnum,
153 int dif)
154 {
155 int score = -1;
156
157 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum &&
158 sk->sk_family == PF_INET6) {
159 struct ipv6_pinfo *np = inet6_sk(sk);
160 struct inet_sock *inet = inet_sk(sk);
161
162 if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
163 return -1;
164 score = 0;
165 if (inet->inet_dport) {
166 if (inet->inet_dport != sport)
167 return -1;
168 score++;
169 }
170 if (!ipv6_addr_any(&np->daddr)) {
171 if (!ipv6_addr_equal(&np->daddr, saddr))
172 return -1;
173 score++;
174 }
175 if (sk->sk_bound_dev_if) {
176 if (sk->sk_bound_dev_if != dif)
177 return -1;
178 score++;
179 }
180 }
181 return score;
182 }
183
184 #define udp_portaddr_for_each_entry_rcu(__sk, node, list) \
185 hlist_nulls_for_each_entry_rcu(__sk, node, list, __sk_common.skc_portaddr_node)
186
187 /* called with read_rcu_lock() */
188 static struct sock *udp6_lib_lookup2(struct net *net,
189 const struct in6_addr *saddr, __be16 sport,
190 const struct in6_addr *daddr, unsigned int hnum, int dif,
191 struct udp_hslot *hslot2, unsigned int slot2)
192 {
193 struct sock *sk, *result;
194 struct hlist_nulls_node *node;
195 int score, badness;
196
197 begin:
198 result = NULL;
199 badness = -1;
200 udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) {
201 score = compute_score2(sk, net, saddr, sport,
202 daddr, hnum, dif);
203 if (score > badness) {
204 result = sk;
205 badness = score;
206 if (score == SCORE2_MAX)
207 goto exact_match;
208 }
209 }
210 /*
211 * if the nulls value we got at the end of this lookup is
212 * not the expected one, we must restart lookup.
213 * We probably met an item that was moved to another chain.
214 */
215 if (get_nulls_value(node) != slot2)
216 goto begin;
217
218 if (result) {
219 exact_match:
220 if (unlikely(!atomic_inc_not_zero(&result->sk_refcnt)))
221 result = NULL;
222 else if (unlikely(compute_score2(result, net, saddr, sport,
223 daddr, hnum, dif) < badness)) {
224 sock_put(result);
225 goto begin;
226 }
227 }
228 return result;
229 }
230
231 static struct sock *__udp6_lib_lookup(struct net *net,
232 struct in6_addr *saddr, __be16 sport,
233 struct in6_addr *daddr, __be16 dport,
234 int dif, struct udp_table *udptable)
235 {
236 struct sock *sk, *result;
237 struct hlist_nulls_node *node;
238 unsigned short hnum = ntohs(dport);
239 unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask);
240 struct udp_hslot *hslot2, *hslot = &udptable->hash[slot];
241 int score, badness;
242
243 rcu_read_lock();
244 if (hslot->count > 10) {
245 hash2 = udp6_portaddr_hash(net, daddr, hnum);
246 slot2 = hash2 & udptable->mask;
247 hslot2 = &udptable->hash2[slot2];
248 if (hslot->count < hslot2->count)
249 goto begin;
250
251 result = udp6_lib_lookup2(net, saddr, sport,
252 daddr, hnum, dif,
253 hslot2, slot2);
254 if (!result) {
255 hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum);
256 slot2 = hash2 & udptable->mask;
257 hslot2 = &udptable->hash2[slot2];
258 if (hslot->count < hslot2->count)
259 goto begin;
260
261 result = udp6_lib_lookup2(net, &in6addr_any, sport,
262 daddr, hnum, dif,
263 hslot2, slot2);
264 }
265 rcu_read_unlock();
266 return result;
267 }
268 begin:
269 result = NULL;
270 badness = -1;
271 sk_nulls_for_each_rcu(sk, node, &hslot->head) {
272 score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif);
273 if (score > badness) {
274 result = sk;
275 badness = score;
276 }
277 }
278 /*
279 * if the nulls value we got at the end of this lookup is
280 * not the expected one, we must restart lookup.
281 * We probably met an item that was moved to another chain.
282 */
283 if (get_nulls_value(node) != slot)
284 goto begin;
285
286 if (result) {
287 if (unlikely(!atomic_inc_not_zero(&result->sk_refcnt)))
288 result = NULL;
289 else if (unlikely(compute_score(result, net, hnum, saddr, sport,
290 daddr, dport, dif) < badness)) {
291 sock_put(result);
292 goto begin;
293 }
294 }
295 rcu_read_unlock();
296 return result;
297 }
298
299 static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb,
300 __be16 sport, __be16 dport,
301 struct udp_table *udptable)
302 {
303 struct sock *sk;
304 struct ipv6hdr *iph = ipv6_hdr(skb);
305
306 if (unlikely(sk = skb_steal_sock(skb)))
307 return sk;
308 return __udp6_lib_lookup(dev_net(skb_dst(skb)->dev), &iph->saddr, sport,
309 &iph->daddr, dport, inet6_iif(skb),
310 udptable);
311 }
312
313 /*
314 * This should be easy, if there is something there we
315 * return it, otherwise we block.
316 */
317
318 int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
319 struct msghdr *msg, size_t len,
320 int noblock, int flags, int *addr_len)
321 {
322 struct ipv6_pinfo *np = inet6_sk(sk);
323 struct inet_sock *inet = inet_sk(sk);
324 struct sk_buff *skb;
325 unsigned int ulen, copied;
326 int peeked;
327 int err;
328 int is_udplite = IS_UDPLITE(sk);
329 int is_udp4;
330
331 if (addr_len)
332 *addr_len=sizeof(struct sockaddr_in6);
333
334 if (flags & MSG_ERRQUEUE)
335 return ipv6_recv_error(sk, msg, len);
336
337 try_again:
338 skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),
339 &peeked, &err);
340 if (!skb)
341 goto out;
342
343 ulen = skb->len - sizeof(struct udphdr);
344 copied = len;
345 if (copied > ulen)
346 copied = ulen;
347 else if (copied < ulen)
348 msg->msg_flags |= MSG_TRUNC;
349
350 is_udp4 = (skb->protocol == htons(ETH_P_IP));
351
352 /*
353 * If checksum is needed at all, try to do it while copying the
354 * data. If the data is truncated, or if we only want a partial
355 * coverage checksum (UDP-Lite), do it before the copy.
356 */
357
358 if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) {
359 if (udp_lib_checksum_complete(skb))
360 goto csum_copy_err;
361 }
362
363 if (skb_csum_unnecessary(skb))
364 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr),
365 msg->msg_iov, copied );
366 else {
367 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
368 if (err == -EINVAL)
369 goto csum_copy_err;
370 }
371 if (err)
372 goto out_free;
373
374 if (!peeked) {
375 if (is_udp4)
376 UDP_INC_STATS_USER(sock_net(sk),
377 UDP_MIB_INDATAGRAMS, is_udplite);
378 else
379 UDP6_INC_STATS_USER(sock_net(sk),
380 UDP_MIB_INDATAGRAMS, is_udplite);
381 }
382
383 sock_recv_ts_and_drops(msg, sk, skb);
384
385 /* Copy the address. */
386 if (msg->msg_name) {
387 struct sockaddr_in6 *sin6;
388
389 sin6 = (struct sockaddr_in6 *) msg->msg_name;
390 sin6->sin6_family = AF_INET6;
391 sin6->sin6_port = udp_hdr(skb)->source;
392 sin6->sin6_flowinfo = 0;
393 sin6->sin6_scope_id = 0;
394
395 if (is_udp4)
396 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
397 &sin6->sin6_addr);
398 else {
399 ipv6_addr_copy(&sin6->sin6_addr,
400 &ipv6_hdr(skb)->saddr);
401 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
402 sin6->sin6_scope_id = IP6CB(skb)->iif;
403 }
404
405 }
406 if (is_udp4) {
407 if (inet->cmsg_flags)
408 ip_cmsg_recv(msg, skb);
409 } else {
410 if (np->rxopt.all)
411 datagram_recv_ctl(sk, msg, skb);
412 }
413
414 err = copied;
415 if (flags & MSG_TRUNC)
416 err = ulen;
417
418 out_free:
419 skb_free_datagram_locked(sk, skb);
420 out:
421 return err;
422
423 csum_copy_err:
424 lock_sock(sk);
425 if (!skb_kill_datagram(sk, skb, flags)) {
426 if (is_udp4)
427 UDP_INC_STATS_USER(sock_net(sk),
428 UDP_MIB_INERRORS, is_udplite);
429 else
430 UDP6_INC_STATS_USER(sock_net(sk),
431 UDP_MIB_INERRORS, is_udplite);
432 }
433 release_sock(sk);
434
435 if (flags & MSG_DONTWAIT)
436 return -EAGAIN;
437 goto try_again;
438 }
439
440 void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
441 u8 type, u8 code, int offset, __be32 info,
442 struct udp_table *udptable)
443 {
444 struct ipv6_pinfo *np;
445 struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data;
446 struct in6_addr *saddr = &hdr->saddr;
447 struct in6_addr *daddr = &hdr->daddr;
448 struct udphdr *uh = (struct udphdr*)(skb->data+offset);
449 struct sock *sk;
450 int err;
451
452 sk = __udp6_lib_lookup(dev_net(skb->dev), daddr, uh->dest,
453 saddr, uh->source, inet6_iif(skb), udptable);
454 if (sk == NULL)
455 return;
456
457 np = inet6_sk(sk);
458
459 if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
460 goto out;
461
462 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
463 goto out;
464
465 if (np->recverr)
466 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
467
468 sk->sk_err = err;
469 sk->sk_error_report(sk);
470 out:
471 sock_put(sk);
472 }
473
474 static __inline__ void udpv6_err(struct sk_buff *skb,
475 struct inet6_skb_parm *opt, u8 type,
476 u8 code, int offset, __be32 info )
477 {
478 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table);
479 }
480
481 int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
482 {
483 struct udp_sock *up = udp_sk(sk);
484 int rc;
485 int is_udplite = IS_UDPLITE(sk);
486
487 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
488 goto drop;
489
490 /*
491 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
492 */
493 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
494
495 if (up->pcrlen == 0) { /* full coverage was set */
496 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage"
497 " %d while full coverage %d requested\n",
498 UDP_SKB_CB(skb)->cscov, skb->len);
499 goto drop;
500 }
501 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
502 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d "
503 "too small, need min %d\n",
504 UDP_SKB_CB(skb)->cscov, up->pcrlen);
505 goto drop;
506 }
507 }
508
509 if (sk->sk_filter) {
510 if (udp_lib_checksum_complete(skb))
511 goto drop;
512 }
513
514 if ((rc = sock_queue_rcv_skb(sk, skb)) < 0) {
515 /* Note that an ENOMEM error is charged twice */
516 if (rc == -ENOMEM)
517 UDP6_INC_STATS_BH(sock_net(sk),
518 UDP_MIB_RCVBUFERRORS, is_udplite);
519 goto drop_no_sk_drops_inc;
520 }
521
522 return 0;
523 drop:
524 atomic_inc(&sk->sk_drops);
525 drop_no_sk_drops_inc:
526 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
527 kfree_skb(skb);
528 return -1;
529 }
530
531 static struct sock *udp_v6_mcast_next(struct net *net, struct sock *sk,
532 __be16 loc_port, struct in6_addr *loc_addr,
533 __be16 rmt_port, struct in6_addr *rmt_addr,
534 int dif)
535 {
536 struct hlist_nulls_node *node;
537 struct sock *s = sk;
538 unsigned short num = ntohs(loc_port);
539
540 sk_nulls_for_each_from(s, node) {
541 struct inet_sock *inet = inet_sk(s);
542
543 if (!net_eq(sock_net(s), net))
544 continue;
545
546 if (udp_sk(s)->udp_port_hash == num &&
547 s->sk_family == PF_INET6) {
548 struct ipv6_pinfo *np = inet6_sk(s);
549 if (inet->inet_dport) {
550 if (inet->inet_dport != rmt_port)
551 continue;
552 }
553 if (!ipv6_addr_any(&np->daddr) &&
554 !ipv6_addr_equal(&np->daddr, rmt_addr))
555 continue;
556
557 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)
558 continue;
559
560 if (!ipv6_addr_any(&np->rcv_saddr)) {
561 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr))
562 continue;
563 }
564 if (!inet6_mc_check(s, loc_addr, rmt_addr))
565 continue;
566 return s;
567 }
568 }
569 return NULL;
570 }
571
572 static void flush_stack(struct sock **stack, unsigned int count,
573 struct sk_buff *skb, unsigned int final)
574 {
575 unsigned int i;
576 struct sock *sk;
577 struct sk_buff *skb1;
578
579 for (i = 0; i < count; i++) {
580 skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC);
581
582 if (skb1) {
583 sk = stack[i];
584 bh_lock_sock(sk);
585 if (!sock_owned_by_user(sk))
586 udpv6_queue_rcv_skb(sk, skb1);
587 else
588 sk_add_backlog(sk, skb1);
589 bh_unlock_sock(sk);
590 }
591 }
592 }
593 /*
594 * Note: called only from the BH handler context,
595 * so we don't need to lock the hashes.
596 */
597 static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
598 struct in6_addr *saddr, struct in6_addr *daddr,
599 struct udp_table *udptable)
600 {
601 struct sock *sk, *stack[256 / sizeof(struct sock *)];
602 const struct udphdr *uh = udp_hdr(skb);
603 struct udp_hslot *hslot = udp_hashslot(udptable, net, ntohs(uh->dest));
604 int dif;
605 unsigned int i, count = 0;
606
607 spin_lock(&hslot->lock);
608 sk = sk_nulls_head(&hslot->head);
609 dif = inet6_iif(skb);
610 sk = udp_v6_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif);
611 while (sk) {
612 stack[count++] = sk;
613 sk = udp_v6_mcast_next(net, sk_nulls_next(sk), uh->dest, daddr,
614 uh->source, saddr, dif);
615 if (unlikely(count == ARRAY_SIZE(stack))) {
616 if (!sk)
617 break;
618 flush_stack(stack, count, skb, ~0);
619 count = 0;
620 }
621 }
622 /*
623 * before releasing the lock, we must take reference on sockets
624 */
625 for (i = 0; i < count; i++)
626 sock_hold(stack[i]);
627
628 spin_unlock(&hslot->lock);
629
630 if (count) {
631 flush_stack(stack, count, skb, count - 1);
632
633 for (i = 0; i < count; i++)
634 sock_put(stack[i]);
635 } else {
636 kfree_skb(skb);
637 }
638 return 0;
639 }
640
641 static inline int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh,
642 int proto)
643 {
644 int err;
645
646 UDP_SKB_CB(skb)->partial_cov = 0;
647 UDP_SKB_CB(skb)->cscov = skb->len;
648
649 if (proto == IPPROTO_UDPLITE) {
650 err = udplite_checksum_init(skb, uh);
651 if (err)
652 return err;
653 }
654
655 if (uh->check == 0) {
656 /* RFC 2460 section 8.1 says that we SHOULD log
657 this error. Well, it is reasonable.
658 */
659 LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n");
660 return 1;
661 }
662 if (skb->ip_summed == CHECKSUM_COMPLETE &&
663 !csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
664 skb->len, proto, skb->csum))
665 skb->ip_summed = CHECKSUM_UNNECESSARY;
666
667 if (!skb_csum_unnecessary(skb))
668 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
669 &ipv6_hdr(skb)->daddr,
670 skb->len, proto, 0));
671
672 return 0;
673 }
674
675 int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
676 int proto)
677 {
678 struct sock *sk;
679 struct udphdr *uh;
680 struct net_device *dev = skb->dev;
681 struct in6_addr *saddr, *daddr;
682 u32 ulen = 0;
683 struct net *net = dev_net(skb->dev);
684
685 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
686 goto short_packet;
687
688 saddr = &ipv6_hdr(skb)->saddr;
689 daddr = &ipv6_hdr(skb)->daddr;
690 uh = udp_hdr(skb);
691
692 ulen = ntohs(uh->len);
693 if (ulen > skb->len)
694 goto short_packet;
695
696 if (proto == IPPROTO_UDP) {
697 /* UDP validates ulen. */
698
699 /* Check for jumbo payload */
700 if (ulen == 0)
701 ulen = skb->len;
702
703 if (ulen < sizeof(*uh))
704 goto short_packet;
705
706 if (ulen < skb->len) {
707 if (pskb_trim_rcsum(skb, ulen))
708 goto short_packet;
709 saddr = &ipv6_hdr(skb)->saddr;
710 daddr = &ipv6_hdr(skb)->daddr;
711 uh = udp_hdr(skb);
712 }
713 }
714
715 if (udp6_csum_init(skb, uh, proto))
716 goto discard;
717
718 /*
719 * Multicast receive code
720 */
721 if (ipv6_addr_is_multicast(daddr))
722 return __udp6_lib_mcast_deliver(net, skb,
723 saddr, daddr, udptable);
724
725 /* Unicast */
726
727 /*
728 * check socket cache ... must talk to Alan about his plans
729 * for sock caches... i'll skip this for now.
730 */
731 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
732
733 if (sk == NULL) {
734 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
735 goto discard;
736
737 if (udp_lib_checksum_complete(skb))
738 goto discard;
739 UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS,
740 proto == IPPROTO_UDPLITE);
741
742 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev);
743
744 kfree_skb(skb);
745 return 0;
746 }
747
748 /* deliver */
749
750 bh_lock_sock(sk);
751 if (!sock_owned_by_user(sk))
752 udpv6_queue_rcv_skb(sk, skb);
753 else
754 sk_add_backlog(sk, skb);
755 bh_unlock_sock(sk);
756 sock_put(sk);
757 return 0;
758
759 short_packet:
760 LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: %d/%u\n",
761 proto == IPPROTO_UDPLITE ? "-Lite" : "",
762 ulen, skb->len);
763
764 discard:
765 UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
766 kfree_skb(skb);
767 return 0;
768 }
769
770 static __inline__ int udpv6_rcv(struct sk_buff *skb)
771 {
772 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP);
773 }
774
775 /*
776 * Throw away all pending data and cancel the corking. Socket is locked.
777 */
778 static void udp_v6_flush_pending_frames(struct sock *sk)
779 {
780 struct udp_sock *up = udp_sk(sk);
781
782 if (up->pending == AF_INET)
783 udp_flush_pending_frames(sk);
784 else if (up->pending) {
785 up->len = 0;
786 up->pending = 0;
787 ip6_flush_pending_frames(sk);
788 }
789 }
790
791 /**
792 * udp6_hwcsum_outgoing - handle outgoing HW checksumming
793 * @sk: socket we are sending on
794 * @skb: sk_buff containing the filled-in UDP header
795 * (checksum field must be zeroed out)
796 */
797 static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
798 const struct in6_addr *saddr,
799 const struct in6_addr *daddr, int len)
800 {
801 unsigned int offset;
802 struct udphdr *uh = udp_hdr(skb);
803 __wsum csum = 0;
804
805 if (skb_queue_len(&sk->sk_write_queue) == 1) {
806 /* Only one fragment on the socket. */
807 skb->csum_start = skb_transport_header(skb) - skb->head;
808 skb->csum_offset = offsetof(struct udphdr, check);
809 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0);
810 } else {
811 /*
812 * HW-checksum won't work as there are two or more
813 * fragments on the socket so that all csums of sk_buffs
814 * should be together
815 */
816 offset = skb_transport_offset(skb);
817 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
818
819 skb->ip_summed = CHECKSUM_NONE;
820
821 skb_queue_walk(&sk->sk_write_queue, skb) {
822 csum = csum_add(csum, skb->csum);
823 }
824
825 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP,
826 csum);
827 if (uh->check == 0)
828 uh->check = CSUM_MANGLED_0;
829 }
830 }
831
832 /*
833 * Sending
834 */
835
836 static int udp_v6_push_pending_frames(struct sock *sk)
837 {
838 struct sk_buff *skb;
839 struct udphdr *uh;
840 struct udp_sock *up = udp_sk(sk);
841 struct inet_sock *inet = inet_sk(sk);
842 struct flowi *fl = &inet->cork.fl;
843 int err = 0;
844 int is_udplite = IS_UDPLITE(sk);
845 __wsum csum = 0;
846
847 /* Grab the skbuff where UDP header space exists. */
848 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
849 goto out;
850
851 /*
852 * Create a UDP header
853 */
854 uh = udp_hdr(skb);
855 uh->source = fl->fl_ip_sport;
856 uh->dest = fl->fl_ip_dport;
857 uh->len = htons(up->len);
858 uh->check = 0;
859
860 if (is_udplite)
861 csum = udplite_csum_outgoing(sk, skb);
862 else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
863 udp6_hwcsum_outgoing(sk, skb, &fl->fl6_src, &fl->fl6_dst,
864 up->len);
865 goto send;
866 } else
867 csum = udp_csum_outgoing(sk, skb);
868
869 /* add protocol-dependent pseudo-header */
870 uh->check = csum_ipv6_magic(&fl->fl6_src, &fl->fl6_dst,
871 up->len, fl->proto, csum );
872 if (uh->check == 0)
873 uh->check = CSUM_MANGLED_0;
874
875 send:
876 err = ip6_push_pending_frames(sk);
877 if (err) {
878 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) {
879 UDP6_INC_STATS_USER(sock_net(sk),
880 UDP_MIB_SNDBUFERRORS, is_udplite);
881 err = 0;
882 }
883 } else
884 UDP6_INC_STATS_USER(sock_net(sk),
885 UDP_MIB_OUTDATAGRAMS, is_udplite);
886 out:
887 up->len = 0;
888 up->pending = 0;
889 return err;
890 }
891
892 int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
893 struct msghdr *msg, size_t len)
894 {
895 struct ipv6_txoptions opt_space;
896 struct udp_sock *up = udp_sk(sk);
897 struct inet_sock *inet = inet_sk(sk);
898 struct ipv6_pinfo *np = inet6_sk(sk);
899 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
900 struct in6_addr *daddr, *final_p = NULL, final;
901 struct ipv6_txoptions *opt = NULL;
902 struct ip6_flowlabel *flowlabel = NULL;
903 struct flowi fl;
904 struct dst_entry *dst;
905 int addr_len = msg->msg_namelen;
906 int ulen = len;
907 int hlimit = -1;
908 int tclass = -1;
909 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
910 int err;
911 int connected = 0;
912 int is_udplite = IS_UDPLITE(sk);
913 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
914
915 /* destination address check */
916 if (sin6) {
917 if (addr_len < offsetof(struct sockaddr, sa_data))
918 return -EINVAL;
919
920 switch (sin6->sin6_family) {
921 case AF_INET6:
922 if (addr_len < SIN6_LEN_RFC2133)
923 return -EINVAL;
924 daddr = &sin6->sin6_addr;
925 break;
926 case AF_INET:
927 goto do_udp_sendmsg;
928 case AF_UNSPEC:
929 msg->msg_name = sin6 = NULL;
930 msg->msg_namelen = addr_len = 0;
931 daddr = NULL;
932 break;
933 default:
934 return -EINVAL;
935 }
936 } else if (!up->pending) {
937 if (sk->sk_state != TCP_ESTABLISHED)
938 return -EDESTADDRREQ;
939 daddr = &np->daddr;
940 } else
941 daddr = NULL;
942
943 if (daddr) {
944 if (ipv6_addr_v4mapped(daddr)) {
945 struct sockaddr_in sin;
946 sin.sin_family = AF_INET;
947 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport;
948 sin.sin_addr.s_addr = daddr->s6_addr32[3];
949 msg->msg_name = &sin;
950 msg->msg_namelen = sizeof(sin);
951 do_udp_sendmsg:
952 if (__ipv6_only_sock(sk))
953 return -ENETUNREACH;
954 return udp_sendmsg(iocb, sk, msg, len);
955 }
956 }
957
958 if (up->pending == AF_INET)
959 return udp_sendmsg(iocb, sk, msg, len);
960
961 /* Rough check on arithmetic overflow,
962 better check is made in ip6_append_data().
963 */
964 if (len > INT_MAX - sizeof(struct udphdr))
965 return -EMSGSIZE;
966
967 if (up->pending) {
968 /*
969 * There are pending frames.
970 * The socket lock must be held while it's corked.
971 */
972 lock_sock(sk);
973 if (likely(up->pending)) {
974 if (unlikely(up->pending != AF_INET6)) {
975 release_sock(sk);
976 return -EAFNOSUPPORT;
977 }
978 dst = NULL;
979 goto do_append_data;
980 }
981 release_sock(sk);
982 }
983 ulen += sizeof(struct udphdr);
984
985 memset(&fl, 0, sizeof(fl));
986
987 if (sin6) {
988 if (sin6->sin6_port == 0)
989 return -EINVAL;
990
991 fl.fl_ip_dport = sin6->sin6_port;
992 daddr = &sin6->sin6_addr;
993
994 if (np->sndflow) {
995 fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
996 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
997 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
998 if (flowlabel == NULL)
999 return -EINVAL;
1000 daddr = &flowlabel->dst;
1001 }
1002 }
1003
1004 /*
1005 * Otherwise it will be difficult to maintain
1006 * sk->sk_dst_cache.
1007 */
1008 if (sk->sk_state == TCP_ESTABLISHED &&
1009 ipv6_addr_equal(daddr, &np->daddr))
1010 daddr = &np->daddr;
1011
1012 if (addr_len >= sizeof(struct sockaddr_in6) &&
1013 sin6->sin6_scope_id &&
1014 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
1015 fl.oif = sin6->sin6_scope_id;
1016 } else {
1017 if (sk->sk_state != TCP_ESTABLISHED)
1018 return -EDESTADDRREQ;
1019
1020 fl.fl_ip_dport = inet->inet_dport;
1021 daddr = &np->daddr;
1022 fl.fl6_flowlabel = np->flow_label;
1023 connected = 1;
1024 }
1025
1026 if (!fl.oif)
1027 fl.oif = sk->sk_bound_dev_if;
1028
1029 if (!fl.oif)
1030 fl.oif = np->sticky_pktinfo.ipi6_ifindex;
1031
1032 fl.mark = sk->sk_mark;
1033
1034 if (msg->msg_controllen) {
1035 opt = &opt_space;
1036 memset(opt, 0, sizeof(struct ipv6_txoptions));
1037 opt->tot_len = sizeof(*opt);
1038
1039 err = datagram_send_ctl(sock_net(sk), msg, &fl, opt, &hlimit, &tclass);
1040 if (err < 0) {
1041 fl6_sock_release(flowlabel);
1042 return err;
1043 }
1044 if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
1045 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
1046 if (flowlabel == NULL)
1047 return -EINVAL;
1048 }
1049 if (!(opt->opt_nflen|opt->opt_flen))
1050 opt = NULL;
1051 connected = 0;
1052 }
1053 if (opt == NULL)
1054 opt = np->opt;
1055 if (flowlabel)
1056 opt = fl6_merge_options(&opt_space, flowlabel, opt);
1057 opt = ipv6_fixup_options(&opt_space, opt);
1058
1059 fl.proto = sk->sk_protocol;
1060 if (!ipv6_addr_any(daddr))
1061 ipv6_addr_copy(&fl.fl6_dst, daddr);
1062 else
1063 fl.fl6_dst.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
1064 if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr))
1065 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
1066 fl.fl_ip_sport = inet->inet_sport;
1067
1068 /* merge ip6_build_xmit from ip6_output */
1069 if (opt && opt->srcrt) {
1070 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
1071 ipv6_addr_copy(&final, &fl.fl6_dst);
1072 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
1073 final_p = &final;
1074 connected = 0;
1075 }
1076
1077 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) {
1078 fl.oif = np->mcast_oif;
1079 connected = 0;
1080 }
1081
1082 security_sk_classify_flow(sk, &fl);
1083
1084 err = ip6_sk_dst_lookup(sk, &dst, &fl);
1085 if (err)
1086 goto out;
1087 if (final_p)
1088 ipv6_addr_copy(&fl.fl6_dst, final_p);
1089
1090 err = __xfrm_lookup(sock_net(sk), &dst, &fl, sk, XFRM_LOOKUP_WAIT);
1091 if (err < 0) {
1092 if (err == -EREMOTE)
1093 err = ip6_dst_blackhole(sk, &dst, &fl);
1094 if (err < 0)
1095 goto out;
1096 }
1097
1098 if (hlimit < 0) {
1099 if (ipv6_addr_is_multicast(&fl.fl6_dst))
1100 hlimit = np->mcast_hops;
1101 else
1102 hlimit = np->hop_limit;
1103 if (hlimit < 0)
1104 hlimit = ip6_dst_hoplimit(dst);
1105 }
1106
1107 if (tclass < 0)
1108 tclass = np->tclass;
1109
1110 if (msg->msg_flags&MSG_CONFIRM)
1111 goto do_confirm;
1112 back_from_confirm:
1113
1114 lock_sock(sk);
1115 if (unlikely(up->pending)) {
1116 /* The socket is already corked while preparing it. */
1117 /* ... which is an evident application bug. --ANK */
1118 release_sock(sk);
1119
1120 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
1121 err = -EINVAL;
1122 goto out;
1123 }
1124
1125 up->pending = AF_INET6;
1126
1127 do_append_data:
1128 up->len += ulen;
1129 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
1130 err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen,
1131 sizeof(struct udphdr), hlimit, tclass, opt, &fl,
1132 (struct rt6_info*)dst,
1133 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
1134 if (err)
1135 udp_v6_flush_pending_frames(sk);
1136 else if (!corkreq)
1137 err = udp_v6_push_pending_frames(sk);
1138 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
1139 up->pending = 0;
1140
1141 if (dst) {
1142 if (connected) {
1143 ip6_dst_store(sk, dst,
1144 ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ?
1145 &np->daddr : NULL,
1146 #ifdef CONFIG_IPV6_SUBTREES
1147 ipv6_addr_equal(&fl.fl6_src, &np->saddr) ?
1148 &np->saddr :
1149 #endif
1150 NULL);
1151 } else {
1152 dst_release(dst);
1153 }
1154 dst = NULL;
1155 }
1156
1157 if (err > 0)
1158 err = np->recverr ? net_xmit_errno(err) : 0;
1159 release_sock(sk);
1160 out:
1161 dst_release(dst);
1162 fl6_sock_release(flowlabel);
1163 if (!err)
1164 return len;
1165 /*
1166 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
1167 * ENOBUFS might not be good (it's not tunable per se), but otherwise
1168 * we don't have a good statistic (IpOutDiscards but it can be too many
1169 * things). We could add another new stat but at least for now that
1170 * seems like overkill.
1171 */
1172 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
1173 UDP6_INC_STATS_USER(sock_net(sk),
1174 UDP_MIB_SNDBUFERRORS, is_udplite);
1175 }
1176 return err;
1177
1178 do_confirm:
1179 dst_confirm(dst);
1180 if (!(msg->msg_flags&MSG_PROBE) || len)
1181 goto back_from_confirm;
1182 err = 0;
1183 goto out;
1184 }
1185
1186 void udpv6_destroy_sock(struct sock *sk)
1187 {
1188 lock_sock(sk);
1189 udp_v6_flush_pending_frames(sk);
1190 release_sock(sk);
1191
1192 inet6_destroy_sock(sk);
1193 }
1194
1195 /*
1196 * Socket option code for UDP
1197 */
1198 int udpv6_setsockopt(struct sock *sk, int level, int optname,
1199 char __user *optval, unsigned int optlen)
1200 {
1201 if (level == SOL_UDP || level == SOL_UDPLITE)
1202 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1203 udp_v6_push_pending_frames);
1204 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1205 }
1206
1207 #ifdef CONFIG_COMPAT
1208 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
1209 char __user *optval, unsigned int optlen)
1210 {
1211 if (level == SOL_UDP || level == SOL_UDPLITE)
1212 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1213 udp_v6_push_pending_frames);
1214 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
1215 }
1216 #endif
1217
1218 int udpv6_getsockopt(struct sock *sk, int level, int optname,
1219 char __user *optval, int __user *optlen)
1220 {
1221 if (level == SOL_UDP || level == SOL_UDPLITE)
1222 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1223 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1224 }
1225
1226 #ifdef CONFIG_COMPAT
1227 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
1228 char __user *optval, int __user *optlen)
1229 {
1230 if (level == SOL_UDP || level == SOL_UDPLITE)
1231 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1232 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
1233 }
1234 #endif
1235
1236 static int udp6_ufo_send_check(struct sk_buff *skb)
1237 {
1238 struct ipv6hdr *ipv6h;
1239 struct udphdr *uh;
1240
1241 if (!pskb_may_pull(skb, sizeof(*uh)))
1242 return -EINVAL;
1243
1244 ipv6h = ipv6_hdr(skb);
1245 uh = udp_hdr(skb);
1246
1247 uh->check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr, skb->len,
1248 IPPROTO_UDP, 0);
1249 skb->csum_start = skb_transport_header(skb) - skb->head;
1250 skb->csum_offset = offsetof(struct udphdr, check);
1251 skb->ip_summed = CHECKSUM_PARTIAL;
1252 return 0;
1253 }
1254
1255 static struct sk_buff *udp6_ufo_fragment(struct sk_buff *skb, int features)
1256 {
1257 struct sk_buff *segs = ERR_PTR(-EINVAL);
1258 unsigned int mss;
1259 unsigned int unfrag_ip6hlen, unfrag_len;
1260 struct frag_hdr *fptr;
1261 u8 *mac_start, *prevhdr;
1262 u8 nexthdr;
1263 u8 frag_hdr_sz = sizeof(struct frag_hdr);
1264 int offset;
1265 __wsum csum;
1266
1267 mss = skb_shinfo(skb)->gso_size;
1268 if (unlikely(skb->len <= mss))
1269 goto out;
1270
1271 if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) {
1272 /* Packet is from an untrusted source, reset gso_segs. */
1273 int type = skb_shinfo(skb)->gso_type;
1274
1275 if (unlikely(type & ~(SKB_GSO_UDP | SKB_GSO_DODGY) ||
1276 !(type & (SKB_GSO_UDP))))
1277 goto out;
1278
1279 skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(skb->len, mss);
1280
1281 segs = NULL;
1282 goto out;
1283 }
1284
1285 /* Do software UFO. Complete and fill in the UDP checksum as HW cannot
1286 * do checksum of UDP packets sent as multiple IP fragments.
1287 */
1288 offset = skb->csum_start - skb_headroom(skb);
1289 csum = skb_checksum(skb, offset, skb->len- offset, 0);
1290 offset += skb->csum_offset;
1291 *(__sum16 *)(skb->data + offset) = csum_fold(csum);
1292 skb->ip_summed = CHECKSUM_NONE;
1293
1294 /* Check if there is enough headroom to insert fragment header. */
1295 if ((skb_headroom(skb) < frag_hdr_sz) &&
1296 pskb_expand_head(skb, frag_hdr_sz, 0, GFP_ATOMIC))
1297 goto out;
1298
1299 /* Find the unfragmentable header and shift it left by frag_hdr_sz
1300 * bytes to insert fragment header.
1301 */
1302 unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr);
1303 nexthdr = *prevhdr;
1304 *prevhdr = NEXTHDR_FRAGMENT;
1305 unfrag_len = skb_network_header(skb) - skb_mac_header(skb) +
1306 unfrag_ip6hlen;
1307 mac_start = skb_mac_header(skb);
1308 memmove(mac_start-frag_hdr_sz, mac_start, unfrag_len);
1309
1310 skb->mac_header -= frag_hdr_sz;
1311 skb->network_header -= frag_hdr_sz;
1312
1313 fptr = (struct frag_hdr *)(skb_network_header(skb) + unfrag_ip6hlen);
1314 fptr->nexthdr = nexthdr;
1315 fptr->reserved = 0;
1316 ipv6_select_ident(fptr);
1317
1318 /* Fragment the skb. ipv6 header and the remaining fields of the
1319 * fragment header are updated in ipv6_gso_segment()
1320 */
1321 segs = skb_segment(skb, features);
1322
1323 out:
1324 return segs;
1325 }
1326
1327 static const struct inet6_protocol udpv6_protocol = {
1328 .handler = udpv6_rcv,
1329 .err_handler = udpv6_err,
1330 .gso_send_check = udp6_ufo_send_check,
1331 .gso_segment = udp6_ufo_fragment,
1332 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1333 };
1334
1335 /* ------------------------------------------------------------------------ */
1336 #ifdef CONFIG_PROC_FS
1337
1338 static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket)
1339 {
1340 struct inet_sock *inet = inet_sk(sp);
1341 struct ipv6_pinfo *np = inet6_sk(sp);
1342 struct in6_addr *dest, *src;
1343 __u16 destp, srcp;
1344
1345 dest = &np->daddr;
1346 src = &np->rcv_saddr;
1347 destp = ntohs(inet->inet_dport);
1348 srcp = ntohs(inet->inet_sport);
1349 seq_printf(seq,
1350 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1351 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %d\n",
1352 bucket,
1353 src->s6_addr32[0], src->s6_addr32[1],
1354 src->s6_addr32[2], src->s6_addr32[3], srcp,
1355 dest->s6_addr32[0], dest->s6_addr32[1],
1356 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1357 sp->sk_state,
1358 sk_wmem_alloc_get(sp),
1359 sk_rmem_alloc_get(sp),
1360 0, 0L, 0,
1361 sock_i_uid(sp), 0,
1362 sock_i_ino(sp),
1363 atomic_read(&sp->sk_refcnt), sp,
1364 atomic_read(&sp->sk_drops));
1365 }
1366
1367 int udp6_seq_show(struct seq_file *seq, void *v)
1368 {
1369 if (v == SEQ_START_TOKEN)
1370 seq_printf(seq,
1371 " sl "
1372 "local_address "
1373 "remote_address "
1374 "st tx_queue rx_queue tr tm->when retrnsmt"
1375 " uid timeout inode ref pointer drops\n");
1376 else
1377 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket);
1378 return 0;
1379 }
1380
1381 static struct udp_seq_afinfo udp6_seq_afinfo = {
1382 .name = "udp6",
1383 .family = AF_INET6,
1384 .udp_table = &udp_table,
1385 .seq_fops = {
1386 .owner = THIS_MODULE,
1387 },
1388 .seq_ops = {
1389 .show = udp6_seq_show,
1390 },
1391 };
1392
1393 int udp6_proc_init(struct net *net)
1394 {
1395 return udp_proc_register(net, &udp6_seq_afinfo);
1396 }
1397
1398 void udp6_proc_exit(struct net *net) {
1399 udp_proc_unregister(net, &udp6_seq_afinfo);
1400 }
1401 #endif /* CONFIG_PROC_FS */
1402
1403 /* ------------------------------------------------------------------------ */
1404
1405 struct proto udpv6_prot = {
1406 .name = "UDPv6",
1407 .owner = THIS_MODULE,
1408 .close = udp_lib_close,
1409 .connect = ip6_datagram_connect,
1410 .disconnect = udp_disconnect,
1411 .ioctl = udp_ioctl,
1412 .destroy = udpv6_destroy_sock,
1413 .setsockopt = udpv6_setsockopt,
1414 .getsockopt = udpv6_getsockopt,
1415 .sendmsg = udpv6_sendmsg,
1416 .recvmsg = udpv6_recvmsg,
1417 .backlog_rcv = udpv6_queue_rcv_skb,
1418 .hash = udp_lib_hash,
1419 .unhash = udp_lib_unhash,
1420 .get_port = udp_v6_get_port,
1421 .memory_allocated = &udp_memory_allocated,
1422 .sysctl_mem = sysctl_udp_mem,
1423 .sysctl_wmem = &sysctl_udp_wmem_min,
1424 .sysctl_rmem = &sysctl_udp_rmem_min,
1425 .obj_size = sizeof(struct udp6_sock),
1426 .slab_flags = SLAB_DESTROY_BY_RCU,
1427 .h.udp_table = &udp_table,
1428 #ifdef CONFIG_COMPAT
1429 .compat_setsockopt = compat_udpv6_setsockopt,
1430 .compat_getsockopt = compat_udpv6_getsockopt,
1431 #endif
1432 };
1433
1434 static struct inet_protosw udpv6_protosw = {
1435 .type = SOCK_DGRAM,
1436 .protocol = IPPROTO_UDP,
1437 .prot = &udpv6_prot,
1438 .ops = &inet6_dgram_ops,
1439 .no_check = UDP_CSUM_DEFAULT,
1440 .flags = INET_PROTOSW_PERMANENT,
1441 };
1442
1443
1444 int __init udpv6_init(void)
1445 {
1446 int ret;
1447
1448 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
1449 if (ret)
1450 goto out;
1451
1452 ret = inet6_register_protosw(&udpv6_protosw);
1453 if (ret)
1454 goto out_udpv6_protocol;
1455 out:
1456 return ret;
1457
1458 out_udpv6_protocol:
1459 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1460 goto out;
1461 }
1462
1463 void udpv6_exit(void)
1464 {
1465 inet6_unregister_protosw(&udpv6_protosw);
1466 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1467 }
Linux kernel - Deliverables
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