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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394...
[deliverable/linux.git] / net / ipv6 / udp.c
1 /*
2 * UDP over IPv6
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * Based on linux/ipv4/udp.c
9 *
10 * Fixes:
11 * Hideaki YOSHIFUJI : sin6_scope_id support
12 * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which
13 * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind
14 * a single port at the same time.
15 * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data
16 * YOSHIFUJI Hideaki @USAGI: convert /proc/net/udp6 to seq_file.
17 *
18 * This program is free software; you can redistribute it and/or
19 * modify it under the terms of the GNU General Public License
20 * as published by the Free Software Foundation; either version
21 * 2 of the License, or (at your option) any later version.
22 */
23
24 #include <linux/errno.h>
25 #include <linux/types.h>
26 #include <linux/socket.h>
27 #include <linux/sockios.h>
28 #include <linux/net.h>
29 #include <linux/in6.h>
30 #include <linux/netdevice.h>
31 #include <linux/if_arp.h>
32 #include <linux/ipv6.h>
33 #include <linux/icmpv6.h>
34 #include <linux/init.h>
35 #include <linux/module.h>
36 #include <linux/skbuff.h>
37 #include <linux/slab.h>
38 #include <asm/uaccess.h>
39
40 #include <net/ndisc.h>
41 #include <net/protocol.h>
42 #include <net/transp_v6.h>
43 #include <net/ip6_route.h>
44 #include <net/raw.h>
45 #include <net/tcp_states.h>
46 #include <net/ip6_checksum.h>
47 #include <net/xfrm.h>
48
49 #include <linux/proc_fs.h>
50 #include <linux/seq_file.h>
51 #include "udp_impl.h"
52
53 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
54 {
55 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
56 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
57 __be32 sk1_rcv_saddr = inet_sk(sk)->inet_rcv_saddr;
58 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
59 int sk_ipv6only = ipv6_only_sock(sk);
60 int sk2_ipv6only = inet_v6_ipv6only(sk2);
61 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
62 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
63
64 /* if both are mapped, treat as IPv4 */
65 if (addr_type == IPV6_ADDR_MAPPED && addr_type2 == IPV6_ADDR_MAPPED)
66 return (!sk2_ipv6only &&
67 (!sk1_rcv_saddr || !sk2_rcv_saddr ||
68 sk1_rcv_saddr == sk2_rcv_saddr));
69
70 if (addr_type2 == IPV6_ADDR_ANY &&
71 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
72 return 1;
73
74 if (addr_type == IPV6_ADDR_ANY &&
75 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
76 return 1;
77
78 if (sk2_rcv_saddr6 &&
79 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
80 return 1;
81
82 return 0;
83 }
84
85 static unsigned int udp6_portaddr_hash(struct net *net,
86 const struct in6_addr *addr6,
87 unsigned int port)
88 {
89 unsigned int hash, mix = net_hash_mix(net);
90
91 if (ipv6_addr_any(addr6))
92 hash = jhash_1word(0, mix);
93 else if (ipv6_addr_v4mapped(addr6))
94 hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix);
95 else
96 hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix);
97
98 return hash ^ port;
99 }
100
101
102 int udp_v6_get_port(struct sock *sk, unsigned short snum)
103 {
104 unsigned int hash2_nulladdr =
105 udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum);
106 unsigned int hash2_partial =
107 udp6_portaddr_hash(sock_net(sk), &inet6_sk(sk)->rcv_saddr, 0);
108
109 /* precompute partial secondary hash */
110 udp_sk(sk)->udp_portaddr_hash = hash2_partial;
111 return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal, hash2_nulladdr);
112 }
113
114 static inline int compute_score(struct sock *sk, struct net *net,
115 unsigned short hnum,
116 struct in6_addr *saddr, __be16 sport,
117 struct in6_addr *daddr, __be16 dport,
118 int dif)
119 {
120 int score = -1;
121
122 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum &&
123 sk->sk_family == PF_INET6) {
124 struct ipv6_pinfo *np = inet6_sk(sk);
125 struct inet_sock *inet = inet_sk(sk);
126
127 score = 0;
128 if (inet->inet_dport) {
129 if (inet->inet_dport != sport)
130 return -1;
131 score++;
132 }
133 if (!ipv6_addr_any(&np->rcv_saddr)) {
134 if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
135 return -1;
136 score++;
137 }
138 if (!ipv6_addr_any(&np->daddr)) {
139 if (!ipv6_addr_equal(&np->daddr, saddr))
140 return -1;
141 score++;
142 }
143 if (sk->sk_bound_dev_if) {
144 if (sk->sk_bound_dev_if != dif)
145 return -1;
146 score++;
147 }
148 }
149 return score;
150 }
151
152 #define SCORE2_MAX (1 + 1 + 1)
153 static inline int compute_score2(struct sock *sk, struct net *net,
154 const struct in6_addr *saddr, __be16 sport,
155 const struct in6_addr *daddr, unsigned short hnum,
156 int dif)
157 {
158 int score = -1;
159
160 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum &&
161 sk->sk_family == PF_INET6) {
162 struct ipv6_pinfo *np = inet6_sk(sk);
163 struct inet_sock *inet = inet_sk(sk);
164
165 if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
166 return -1;
167 score = 0;
168 if (inet->inet_dport) {
169 if (inet->inet_dport != sport)
170 return -1;
171 score++;
172 }
173 if (!ipv6_addr_any(&np->daddr)) {
174 if (!ipv6_addr_equal(&np->daddr, saddr))
175 return -1;
176 score++;
177 }
178 if (sk->sk_bound_dev_if) {
179 if (sk->sk_bound_dev_if != dif)
180 return -1;
181 score++;
182 }
183 }
184 return score;
185 }
186
187
188 /* called with read_rcu_lock() */
189 static struct sock *udp6_lib_lookup2(struct net *net,
190 const struct in6_addr *saddr, __be16 sport,
191 const struct in6_addr *daddr, unsigned int hnum, int dif,
192 struct udp_hslot *hslot2, unsigned int slot2)
193 {
194 struct sock *sk, *result;
195 struct hlist_nulls_node *node;
196 int score, badness;
197
198 begin:
199 result = NULL;
200 badness = -1;
201 udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) {
202 score = compute_score2(sk, net, saddr, sport,
203 daddr, hnum, dif);
204 if (score > badness) {
205 result = sk;
206 badness = score;
207 if (score == SCORE2_MAX)
208 goto exact_match;
209 }
210 }
211 /*
212 * if the nulls value we got at the end of this lookup is
213 * not the expected one, we must restart lookup.
214 * We probably met an item that was moved to another chain.
215 */
216 if (get_nulls_value(node) != slot2)
217 goto begin;
218
219 if (result) {
220 exact_match:
221 if (unlikely(!atomic_inc_not_zero(&result->sk_refcnt)))
222 result = NULL;
223 else if (unlikely(compute_score2(result, net, saddr, sport,
224 daddr, hnum, dif) < badness)) {
225 sock_put(result);
226 goto begin;
227 }
228 }
229 return result;
230 }
231
232 static struct sock *__udp6_lib_lookup(struct net *net,
233 struct in6_addr *saddr, __be16 sport,
234 struct in6_addr *daddr, __be16 dport,
235 int dif, struct udp_table *udptable)
236 {
237 struct sock *sk, *result;
238 struct hlist_nulls_node *node;
239 unsigned short hnum = ntohs(dport);
240 unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask);
241 struct udp_hslot *hslot2, *hslot = &udptable->hash[slot];
242 int score, badness;
243
244 rcu_read_lock();
245 if (hslot->count > 10) {
246 hash2 = udp6_portaddr_hash(net, daddr, hnum);
247 slot2 = hash2 & udptable->mask;
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 hslot2, slot2);
255 if (!result) {
256 hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum);
257 slot2 = hash2 & udptable->mask;
258 hslot2 = &udptable->hash2[slot2];
259 if (hslot->count < hslot2->count)
260 goto begin;
261
262 result = udp6_lib_lookup2(net, saddr, sport,
263 &in6addr_any, hnum, dif,
264 hslot2, slot2);
265 }
266 rcu_read_unlock();
267 return result;
268 }
269 begin:
270 result = NULL;
271 badness = -1;
272 sk_nulls_for_each_rcu(sk, node, &hslot->head) {
273 score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif);
274 if (score > badness) {
275 result = sk;
276 badness = score;
277 }
278 }
279 /*
280 * if the nulls value we got at the end of this lookup is
281 * not the expected one, we must restart lookup.
282 * We probably met an item that was moved to another chain.
283 */
284 if (get_nulls_value(node) != slot)
285 goto begin;
286
287 if (result) {
288 if (unlikely(!atomic_inc_not_zero(&result->sk_refcnt)))
289 result = NULL;
290 else if (unlikely(compute_score(result, net, hnum, saddr, sport,
291 daddr, dport, dif) < badness)) {
292 sock_put(result);
293 goto begin;
294 }
295 }
296 rcu_read_unlock();
297 return result;
298 }
299
300 static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb,
301 __be16 sport, __be16 dport,
302 struct udp_table *udptable)
303 {
304 struct sock *sk;
305 struct ipv6hdr *iph = ipv6_hdr(skb);
306
307 if (unlikely(sk = skb_steal_sock(skb)))
308 return sk;
309 return __udp6_lib_lookup(dev_net(skb_dst(skb)->dev), &iph->saddr, sport,
310 &iph->daddr, dport, inet6_iif(skb),
311 udptable);
312 }
313
314 /*
315 * This should be easy, if there is something there we
316 * return it, otherwise we block.
317 */
318
319 int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
320 struct msghdr *msg, size_t len,
321 int noblock, int flags, int *addr_len)
322 {
323 struct ipv6_pinfo *np = inet6_sk(sk);
324 struct inet_sock *inet = inet_sk(sk);
325 struct sk_buff *skb;
326 unsigned int ulen;
327 int peeked;
328 int err;
329 int is_udplite = IS_UDPLITE(sk);
330 int is_udp4;
331
332 if (addr_len)
333 *addr_len=sizeof(struct sockaddr_in6);
334
335 if (flags & MSG_ERRQUEUE)
336 return ipv6_recv_error(sk, msg, len);
337
338 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
339 return ipv6_recv_rxpmtu(sk, msg, len);
340
341 try_again:
342 skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),
343 &peeked, &err);
344 if (!skb)
345 goto out;
346
347 ulen = skb->len - sizeof(struct udphdr);
348 if (len > ulen)
349 len = ulen;
350 else if (len < ulen)
351 msg->msg_flags |= MSG_TRUNC;
352
353 is_udp4 = (skb->protocol == htons(ETH_P_IP));
354
355 /*
356 * If checksum is needed at all, try to do it while copying the
357 * data. If the data is truncated, or if we only want a partial
358 * coverage checksum (UDP-Lite), do it before the copy.
359 */
360
361 if (len < ulen || UDP_SKB_CB(skb)->partial_cov) {
362 if (udp_lib_checksum_complete(skb))
363 goto csum_copy_err;
364 }
365
366 if (skb_csum_unnecessary(skb))
367 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr),
368 msg->msg_iov,len);
369 else {
370 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
371 if (err == -EINVAL)
372 goto csum_copy_err;
373 }
374 if (err)
375 goto out_free;
376
377 if (!peeked) {
378 if (is_udp4)
379 UDP_INC_STATS_USER(sock_net(sk),
380 UDP_MIB_INDATAGRAMS, is_udplite);
381 else
382 UDP6_INC_STATS_USER(sock_net(sk),
383 UDP_MIB_INDATAGRAMS, is_udplite);
384 }
385
386 sock_recv_ts_and_drops(msg, sk, skb);
387
388 /* Copy the address. */
389 if (msg->msg_name) {
390 struct sockaddr_in6 *sin6;
391
392 sin6 = (struct sockaddr_in6 *) msg->msg_name;
393 sin6->sin6_family = AF_INET6;
394 sin6->sin6_port = udp_hdr(skb)->source;
395 sin6->sin6_flowinfo = 0;
396 sin6->sin6_scope_id = 0;
397
398 if (is_udp4)
399 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
400 &sin6->sin6_addr);
401 else {
402 ipv6_addr_copy(&sin6->sin6_addr,
403 &ipv6_hdr(skb)->saddr);
404 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
405 sin6->sin6_scope_id = IP6CB(skb)->iif;
406 }
407
408 }
409 if (is_udp4) {
410 if (inet->cmsg_flags)
411 ip_cmsg_recv(msg, skb);
412 } else {
413 if (np->rxopt.all)
414 datagram_recv_ctl(sk, msg, skb);
415 }
416
417 err = len;
418 if (flags & MSG_TRUNC)
419 err = ulen;
420
421 out_free:
422 skb_free_datagram_locked(sk, skb);
423 out:
424 return err;
425
426 csum_copy_err:
427 lock_sock_bh(sk);
428 if (!skb_kill_datagram(sk, skb, flags)) {
429 if (is_udp4)
430 UDP_INC_STATS_USER(sock_net(sk),
431 UDP_MIB_INERRORS, is_udplite);
432 else
433 UDP6_INC_STATS_USER(sock_net(sk),
434 UDP_MIB_INERRORS, is_udplite);
435 }
436 unlock_sock_bh(sk);
437
438 if (flags & MSG_DONTWAIT)
439 return -EAGAIN;
440 goto try_again;
441 }
442
443 void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
444 u8 type, u8 code, int offset, __be32 info,
445 struct udp_table *udptable)
446 {
447 struct ipv6_pinfo *np;
448 struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data;
449 struct in6_addr *saddr = &hdr->saddr;
450 struct in6_addr *daddr = &hdr->daddr;
451 struct udphdr *uh = (struct udphdr*)(skb->data+offset);
452 struct sock *sk;
453 int err;
454
455 sk = __udp6_lib_lookup(dev_net(skb->dev), daddr, uh->dest,
456 saddr, uh->source, inet6_iif(skb), udptable);
457 if (sk == NULL)
458 return;
459
460 np = inet6_sk(sk);
461
462 if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
463 goto out;
464
465 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
466 goto out;
467
468 if (np->recverr)
469 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
470
471 sk->sk_err = err;
472 sk->sk_error_report(sk);
473 out:
474 sock_put(sk);
475 }
476
477 static __inline__ void udpv6_err(struct sk_buff *skb,
478 struct inet6_skb_parm *opt, u8 type,
479 u8 code, int offset, __be32 info )
480 {
481 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table);
482 }
483
484 int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
485 {
486 struct udp_sock *up = udp_sk(sk);
487 int rc;
488 int is_udplite = IS_UDPLITE(sk);
489
490 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
491 goto drop;
492
493 /*
494 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
495 */
496 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
497
498 if (up->pcrlen == 0) { /* full coverage was set */
499 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage"
500 " %d while full coverage %d requested\n",
501 UDP_SKB_CB(skb)->cscov, skb->len);
502 goto drop;
503 }
504 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
505 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d "
506 "too small, need min %d\n",
507 UDP_SKB_CB(skb)->cscov, up->pcrlen);
508 goto drop;
509 }
510 }
511
512 if (sk->sk_filter) {
513 if (udp_lib_checksum_complete(skb))
514 goto drop;
515 }
516
517 if ((rc = ip_queue_rcv_skb(sk, skb)) < 0) {
518 /* Note that an ENOMEM error is charged twice */
519 if (rc == -ENOMEM)
520 UDP6_INC_STATS_BH(sock_net(sk),
521 UDP_MIB_RCVBUFERRORS, is_udplite);
522 goto drop_no_sk_drops_inc;
523 }
524
525 return 0;
526 drop:
527 atomic_inc(&sk->sk_drops);
528 drop_no_sk_drops_inc:
529 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
530 kfree_skb(skb);
531 return -1;
532 }
533
534 static struct sock *udp_v6_mcast_next(struct net *net, struct sock *sk,
535 __be16 loc_port, struct in6_addr *loc_addr,
536 __be16 rmt_port, struct in6_addr *rmt_addr,
537 int dif)
538 {
539 struct hlist_nulls_node *node;
540 struct sock *s = sk;
541 unsigned short num = ntohs(loc_port);
542
543 sk_nulls_for_each_from(s, node) {
544 struct inet_sock *inet = inet_sk(s);
545
546 if (!net_eq(sock_net(s), net))
547 continue;
548
549 if (udp_sk(s)->udp_port_hash == num &&
550 s->sk_family == PF_INET6) {
551 struct ipv6_pinfo *np = inet6_sk(s);
552 if (inet->inet_dport) {
553 if (inet->inet_dport != rmt_port)
554 continue;
555 }
556 if (!ipv6_addr_any(&np->daddr) &&
557 !ipv6_addr_equal(&np->daddr, rmt_addr))
558 continue;
559
560 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)
561 continue;
562
563 if (!ipv6_addr_any(&np->rcv_saddr)) {
564 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr))
565 continue;
566 }
567 if (!inet6_mc_check(s, loc_addr, rmt_addr))
568 continue;
569 return s;
570 }
571 }
572 return NULL;
573 }
574
575 static void flush_stack(struct sock **stack, unsigned int count,
576 struct sk_buff *skb, unsigned int final)
577 {
578 unsigned int i;
579 struct sock *sk;
580 struct sk_buff *skb1;
581
582 for (i = 0; i < count; i++) {
583 skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC);
584
585 sk = stack[i];
586 if (skb1) {
587 if (sk_rcvqueues_full(sk, skb)) {
588 kfree_skb(skb1);
589 goto drop;
590 }
591 bh_lock_sock(sk);
592 if (!sock_owned_by_user(sk))
593 udpv6_queue_rcv_skb(sk, skb1);
594 else if (sk_add_backlog(sk, skb1)) {
595 kfree_skb(skb1);
596 bh_unlock_sock(sk);
597 goto drop;
598 }
599 bh_unlock_sock(sk);
600 continue;
601 }
602 drop:
603 atomic_inc(&sk->sk_drops);
604 UDP6_INC_STATS_BH(sock_net(sk),
605 UDP_MIB_RCVBUFERRORS, IS_UDPLITE(sk));
606 UDP6_INC_STATS_BH(sock_net(sk),
607 UDP_MIB_INERRORS, IS_UDPLITE(sk));
608 }
609 }
610 /*
611 * Note: called only from the BH handler context,
612 * so we don't need to lock the hashes.
613 */
614 static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
615 struct in6_addr *saddr, struct in6_addr *daddr,
616 struct udp_table *udptable)
617 {
618 struct sock *sk, *stack[256 / sizeof(struct sock *)];
619 const struct udphdr *uh = udp_hdr(skb);
620 struct udp_hslot *hslot = udp_hashslot(udptable, net, ntohs(uh->dest));
621 int dif;
622 unsigned int i, count = 0;
623
624 spin_lock(&hslot->lock);
625 sk = sk_nulls_head(&hslot->head);
626 dif = inet6_iif(skb);
627 sk = udp_v6_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif);
628 while (sk) {
629 stack[count++] = sk;
630 sk = udp_v6_mcast_next(net, sk_nulls_next(sk), uh->dest, daddr,
631 uh->source, saddr, dif);
632 if (unlikely(count == ARRAY_SIZE(stack))) {
633 if (!sk)
634 break;
635 flush_stack(stack, count, skb, ~0);
636 count = 0;
637 }
638 }
639 /*
640 * before releasing the lock, we must take reference on sockets
641 */
642 for (i = 0; i < count; i++)
643 sock_hold(stack[i]);
644
645 spin_unlock(&hslot->lock);
646
647 if (count) {
648 flush_stack(stack, count, skb, count - 1);
649
650 for (i = 0; i < count; i++)
651 sock_put(stack[i]);
652 } else {
653 kfree_skb(skb);
654 }
655 return 0;
656 }
657
658 static inline int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh,
659 int proto)
660 {
661 int err;
662
663 UDP_SKB_CB(skb)->partial_cov = 0;
664 UDP_SKB_CB(skb)->cscov = skb->len;
665
666 if (proto == IPPROTO_UDPLITE) {
667 err = udplite_checksum_init(skb, uh);
668 if (err)
669 return err;
670 }
671
672 if (uh->check == 0) {
673 /* RFC 2460 section 8.1 says that we SHOULD log
674 this error. Well, it is reasonable.
675 */
676 LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n");
677 return 1;
678 }
679 if (skb->ip_summed == CHECKSUM_COMPLETE &&
680 !csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
681 skb->len, proto, skb->csum))
682 skb->ip_summed = CHECKSUM_UNNECESSARY;
683
684 if (!skb_csum_unnecessary(skb))
685 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
686 &ipv6_hdr(skb)->daddr,
687 skb->len, proto, 0));
688
689 return 0;
690 }
691
692 int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
693 int proto)
694 {
695 struct net *net = dev_net(skb->dev);
696 struct sock *sk;
697 struct udphdr *uh;
698 struct in6_addr *saddr, *daddr;
699 u32 ulen = 0;
700
701 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
702 goto discard;
703
704 saddr = &ipv6_hdr(skb)->saddr;
705 daddr = &ipv6_hdr(skb)->daddr;
706 uh = udp_hdr(skb);
707
708 ulen = ntohs(uh->len);
709 if (ulen > skb->len)
710 goto short_packet;
711
712 if (proto == IPPROTO_UDP) {
713 /* UDP validates ulen. */
714
715 /* Check for jumbo payload */
716 if (ulen == 0)
717 ulen = skb->len;
718
719 if (ulen < sizeof(*uh))
720 goto short_packet;
721
722 if (ulen < skb->len) {
723 if (pskb_trim_rcsum(skb, ulen))
724 goto short_packet;
725 saddr = &ipv6_hdr(skb)->saddr;
726 daddr = &ipv6_hdr(skb)->daddr;
727 uh = udp_hdr(skb);
728 }
729 }
730
731 if (udp6_csum_init(skb, uh, proto))
732 goto discard;
733
734 /*
735 * Multicast receive code
736 */
737 if (ipv6_addr_is_multicast(daddr))
738 return __udp6_lib_mcast_deliver(net, skb,
739 saddr, daddr, udptable);
740
741 /* Unicast */
742
743 /*
744 * check socket cache ... must talk to Alan about his plans
745 * for sock caches... i'll skip this for now.
746 */
747 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
748
749 if (sk == NULL) {
750 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
751 goto discard;
752
753 if (udp_lib_checksum_complete(skb))
754 goto discard;
755 UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS,
756 proto == IPPROTO_UDPLITE);
757
758 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
759
760 kfree_skb(skb);
761 return 0;
762 }
763
764 /* deliver */
765
766 if (sk_rcvqueues_full(sk, skb)) {
767 sock_put(sk);
768 goto discard;
769 }
770 bh_lock_sock(sk);
771 if (!sock_owned_by_user(sk))
772 udpv6_queue_rcv_skb(sk, skb);
773 else if (sk_add_backlog(sk, skb)) {
774 atomic_inc(&sk->sk_drops);
775 bh_unlock_sock(sk);
776 sock_put(sk);
777 goto discard;
778 }
779 bh_unlock_sock(sk);
780 sock_put(sk);
781 return 0;
782
783 short_packet:
784 LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n",
785 proto == IPPROTO_UDPLITE ? "-Lite" : "",
786 saddr,
787 ntohs(uh->source),
788 ulen,
789 skb->len,
790 daddr,
791 ntohs(uh->dest));
792
793 discard:
794 UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
795 kfree_skb(skb);
796 return 0;
797 }
798
799 static __inline__ int udpv6_rcv(struct sk_buff *skb)
800 {
801 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP);
802 }
803
804 /*
805 * Throw away all pending data and cancel the corking. Socket is locked.
806 */
807 static void udp_v6_flush_pending_frames(struct sock *sk)
808 {
809 struct udp_sock *up = udp_sk(sk);
810
811 if (up->pending == AF_INET)
812 udp_flush_pending_frames(sk);
813 else if (up->pending) {
814 up->len = 0;
815 up->pending = 0;
816 ip6_flush_pending_frames(sk);
817 }
818 }
819
820 /**
821 * udp6_hwcsum_outgoing - handle outgoing HW checksumming
822 * @sk: socket we are sending on
823 * @skb: sk_buff containing the filled-in UDP header
824 * (checksum field must be zeroed out)
825 */
826 static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
827 const struct in6_addr *saddr,
828 const struct in6_addr *daddr, int len)
829 {
830 unsigned int offset;
831 struct udphdr *uh = udp_hdr(skb);
832 __wsum csum = 0;
833
834 if (skb_queue_len(&sk->sk_write_queue) == 1) {
835 /* Only one fragment on the socket. */
836 skb->csum_start = skb_transport_header(skb) - skb->head;
837 skb->csum_offset = offsetof(struct udphdr, check);
838 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0);
839 } else {
840 /*
841 * HW-checksum won't work as there are two or more
842 * fragments on the socket so that all csums of sk_buffs
843 * should be together
844 */
845 offset = skb_transport_offset(skb);
846 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
847
848 skb->ip_summed = CHECKSUM_NONE;
849
850 skb_queue_walk(&sk->sk_write_queue, skb) {
851 csum = csum_add(csum, skb->csum);
852 }
853
854 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP,
855 csum);
856 if (uh->check == 0)
857 uh->check = CSUM_MANGLED_0;
858 }
859 }
860
861 /*
862 * Sending
863 */
864
865 static int udp_v6_push_pending_frames(struct sock *sk)
866 {
867 struct sk_buff *skb;
868 struct udphdr *uh;
869 struct udp_sock *up = udp_sk(sk);
870 struct inet_sock *inet = inet_sk(sk);
871 struct flowi *fl = &inet->cork.fl;
872 int err = 0;
873 int is_udplite = IS_UDPLITE(sk);
874 __wsum csum = 0;
875
876 /* Grab the skbuff where UDP header space exists. */
877 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
878 goto out;
879
880 /*
881 * Create a UDP header
882 */
883 uh = udp_hdr(skb);
884 uh->source = fl->fl_ip_sport;
885 uh->dest = fl->fl_ip_dport;
886 uh->len = htons(up->len);
887 uh->check = 0;
888
889 if (is_udplite)
890 csum = udplite_csum_outgoing(sk, skb);
891 else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
892 udp6_hwcsum_outgoing(sk, skb, &fl->fl6_src, &fl->fl6_dst,
893 up->len);
894 goto send;
895 } else
896 csum = udp_csum_outgoing(sk, skb);
897
898 /* add protocol-dependent pseudo-header */
899 uh->check = csum_ipv6_magic(&fl->fl6_src, &fl->fl6_dst,
900 up->len, fl->proto, csum );
901 if (uh->check == 0)
902 uh->check = CSUM_MANGLED_0;
903
904 send:
905 err = ip6_push_pending_frames(sk);
906 if (err) {
907 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) {
908 UDP6_INC_STATS_USER(sock_net(sk),
909 UDP_MIB_SNDBUFERRORS, is_udplite);
910 err = 0;
911 }
912 } else
913 UDP6_INC_STATS_USER(sock_net(sk),
914 UDP_MIB_OUTDATAGRAMS, is_udplite);
915 out:
916 up->len = 0;
917 up->pending = 0;
918 return err;
919 }
920
921 int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
922 struct msghdr *msg, size_t len)
923 {
924 struct ipv6_txoptions opt_space;
925 struct udp_sock *up = udp_sk(sk);
926 struct inet_sock *inet = inet_sk(sk);
927 struct ipv6_pinfo *np = inet6_sk(sk);
928 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
929 struct in6_addr *daddr, *final_p = NULL, final;
930 struct ipv6_txoptions *opt = NULL;
931 struct ip6_flowlabel *flowlabel = NULL;
932 struct flowi fl;
933 struct dst_entry *dst;
934 int addr_len = msg->msg_namelen;
935 int ulen = len;
936 int hlimit = -1;
937 int tclass = -1;
938 int dontfrag = -1;
939 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
940 int err;
941 int connected = 0;
942 int is_udplite = IS_UDPLITE(sk);
943 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
944
945 /* destination address check */
946 if (sin6) {
947 if (addr_len < offsetof(struct sockaddr, sa_data))
948 return -EINVAL;
949
950 switch (sin6->sin6_family) {
951 case AF_INET6:
952 if (addr_len < SIN6_LEN_RFC2133)
953 return -EINVAL;
954 daddr = &sin6->sin6_addr;
955 break;
956 case AF_INET:
957 goto do_udp_sendmsg;
958 case AF_UNSPEC:
959 msg->msg_name = sin6 = NULL;
960 msg->msg_namelen = addr_len = 0;
961 daddr = NULL;
962 break;
963 default:
964 return -EINVAL;
965 }
966 } else if (!up->pending) {
967 if (sk->sk_state != TCP_ESTABLISHED)
968 return -EDESTADDRREQ;
969 daddr = &np->daddr;
970 } else
971 daddr = NULL;
972
973 if (daddr) {
974 if (ipv6_addr_v4mapped(daddr)) {
975 struct sockaddr_in sin;
976 sin.sin_family = AF_INET;
977 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport;
978 sin.sin_addr.s_addr = daddr->s6_addr32[3];
979 msg->msg_name = &sin;
980 msg->msg_namelen = sizeof(sin);
981 do_udp_sendmsg:
982 if (__ipv6_only_sock(sk))
983 return -ENETUNREACH;
984 return udp_sendmsg(iocb, sk, msg, len);
985 }
986 }
987
988 if (up->pending == AF_INET)
989 return udp_sendmsg(iocb, sk, msg, len);
990
991 /* Rough check on arithmetic overflow,
992 better check is made in ip6_append_data().
993 */
994 if (len > INT_MAX - sizeof(struct udphdr))
995 return -EMSGSIZE;
996
997 if (up->pending) {
998 /*
999 * There are pending frames.
1000 * The socket lock must be held while it's corked.
1001 */
1002 lock_sock(sk);
1003 if (likely(up->pending)) {
1004 if (unlikely(up->pending != AF_INET6)) {
1005 release_sock(sk);
1006 return -EAFNOSUPPORT;
1007 }
1008 dst = NULL;
1009 goto do_append_data;
1010 }
1011 release_sock(sk);
1012 }
1013 ulen += sizeof(struct udphdr);
1014
1015 memset(&fl, 0, sizeof(fl));
1016
1017 if (sin6) {
1018 if (sin6->sin6_port == 0)
1019 return -EINVAL;
1020
1021 fl.fl_ip_dport = sin6->sin6_port;
1022 daddr = &sin6->sin6_addr;
1023
1024 if (np->sndflow) {
1025 fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
1026 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
1027 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
1028 if (flowlabel == NULL)
1029 return -EINVAL;
1030 daddr = &flowlabel->dst;
1031 }
1032 }
1033
1034 /*
1035 * Otherwise it will be difficult to maintain
1036 * sk->sk_dst_cache.
1037 */
1038 if (sk->sk_state == TCP_ESTABLISHED &&
1039 ipv6_addr_equal(daddr, &np->daddr))
1040 daddr = &np->daddr;
1041
1042 if (addr_len >= sizeof(struct sockaddr_in6) &&
1043 sin6->sin6_scope_id &&
1044 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
1045 fl.oif = sin6->sin6_scope_id;
1046 } else {
1047 if (sk->sk_state != TCP_ESTABLISHED)
1048 return -EDESTADDRREQ;
1049
1050 fl.fl_ip_dport = inet->inet_dport;
1051 daddr = &np->daddr;
1052 fl.fl6_flowlabel = np->flow_label;
1053 connected = 1;
1054 }
1055
1056 if (!fl.oif)
1057 fl.oif = sk->sk_bound_dev_if;
1058
1059 if (!fl.oif)
1060 fl.oif = np->sticky_pktinfo.ipi6_ifindex;
1061
1062 fl.mark = sk->sk_mark;
1063
1064 if (msg->msg_controllen) {
1065 opt = &opt_space;
1066 memset(opt, 0, sizeof(struct ipv6_txoptions));
1067 opt->tot_len = sizeof(*opt);
1068
1069 err = datagram_send_ctl(sock_net(sk), msg, &fl, opt, &hlimit,
1070 &tclass, &dontfrag);
1071 if (err < 0) {
1072 fl6_sock_release(flowlabel);
1073 return err;
1074 }
1075 if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
1076 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
1077 if (flowlabel == NULL)
1078 return -EINVAL;
1079 }
1080 if (!(opt->opt_nflen|opt->opt_flen))
1081 opt = NULL;
1082 connected = 0;
1083 }
1084 if (opt == NULL)
1085 opt = np->opt;
1086 if (flowlabel)
1087 opt = fl6_merge_options(&opt_space, flowlabel, opt);
1088 opt = ipv6_fixup_options(&opt_space, opt);
1089
1090 fl.proto = sk->sk_protocol;
1091 if (!ipv6_addr_any(daddr))
1092 ipv6_addr_copy(&fl.fl6_dst, daddr);
1093 else
1094 fl.fl6_dst.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
1095 if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr))
1096 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
1097 fl.fl_ip_sport = inet->inet_sport;
1098
1099 /* merge ip6_build_xmit from ip6_output */
1100 if (opt && opt->srcrt) {
1101 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
1102 ipv6_addr_copy(&final, &fl.fl6_dst);
1103 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
1104 final_p = &final;
1105 connected = 0;
1106 }
1107
1108 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) {
1109 fl.oif = np->mcast_oif;
1110 connected = 0;
1111 }
1112
1113 security_sk_classify_flow(sk, &fl);
1114
1115 err = ip6_sk_dst_lookup(sk, &dst, &fl);
1116 if (err)
1117 goto out;
1118 if (final_p)
1119 ipv6_addr_copy(&fl.fl6_dst, final_p);
1120
1121 err = __xfrm_lookup(sock_net(sk), &dst, &fl, sk, XFRM_LOOKUP_WAIT);
1122 if (err < 0) {
1123 if (err == -EREMOTE)
1124 err = ip6_dst_blackhole(sk, &dst, &fl);
1125 if (err < 0)
1126 goto out;
1127 }
1128
1129 if (hlimit < 0) {
1130 if (ipv6_addr_is_multicast(&fl.fl6_dst))
1131 hlimit = np->mcast_hops;
1132 else
1133 hlimit = np->hop_limit;
1134 if (hlimit < 0)
1135 hlimit = ip6_dst_hoplimit(dst);
1136 }
1137
1138 if (tclass < 0)
1139 tclass = np->tclass;
1140
1141 if (dontfrag < 0)
1142 dontfrag = np->dontfrag;
1143
1144 if (msg->msg_flags&MSG_CONFIRM)
1145 goto do_confirm;
1146 back_from_confirm:
1147
1148 lock_sock(sk);
1149 if (unlikely(up->pending)) {
1150 /* The socket is already corked while preparing it. */
1151 /* ... which is an evident application bug. --ANK */
1152 release_sock(sk);
1153
1154 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
1155 err = -EINVAL;
1156 goto out;
1157 }
1158
1159 up->pending = AF_INET6;
1160
1161 do_append_data:
1162 up->len += ulen;
1163 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
1164 err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen,
1165 sizeof(struct udphdr), hlimit, tclass, opt, &fl,
1166 (struct rt6_info*)dst,
1167 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, dontfrag);
1168 if (err)
1169 udp_v6_flush_pending_frames(sk);
1170 else if (!corkreq)
1171 err = udp_v6_push_pending_frames(sk);
1172 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
1173 up->pending = 0;
1174
1175 if (dst) {
1176 if (connected) {
1177 ip6_dst_store(sk, dst,
1178 ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ?
1179 &np->daddr : NULL,
1180 #ifdef CONFIG_IPV6_SUBTREES
1181 ipv6_addr_equal(&fl.fl6_src, &np->saddr) ?
1182 &np->saddr :
1183 #endif
1184 NULL);
1185 } else {
1186 dst_release(dst);
1187 }
1188 dst = NULL;
1189 }
1190
1191 if (err > 0)
1192 err = np->recverr ? net_xmit_errno(err) : 0;
1193 release_sock(sk);
1194 out:
1195 dst_release(dst);
1196 fl6_sock_release(flowlabel);
1197 if (!err)
1198 return len;
1199 /*
1200 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
1201 * ENOBUFS might not be good (it's not tunable per se), but otherwise
1202 * we don't have a good statistic (IpOutDiscards but it can be too many
1203 * things). We could add another new stat but at least for now that
1204 * seems like overkill.
1205 */
1206 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
1207 UDP6_INC_STATS_USER(sock_net(sk),
1208 UDP_MIB_SNDBUFERRORS, is_udplite);
1209 }
1210 return err;
1211
1212 do_confirm:
1213 dst_confirm(dst);
1214 if (!(msg->msg_flags&MSG_PROBE) || len)
1215 goto back_from_confirm;
1216 err = 0;
1217 goto out;
1218 }
1219
1220 void udpv6_destroy_sock(struct sock *sk)
1221 {
1222 lock_sock(sk);
1223 udp_v6_flush_pending_frames(sk);
1224 release_sock(sk);
1225
1226 inet6_destroy_sock(sk);
1227 }
1228
1229 /*
1230 * Socket option code for UDP
1231 */
1232 int udpv6_setsockopt(struct sock *sk, int level, int optname,
1233 char __user *optval, unsigned int optlen)
1234 {
1235 if (level == SOL_UDP || level == SOL_UDPLITE)
1236 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1237 udp_v6_push_pending_frames);
1238 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1239 }
1240
1241 #ifdef CONFIG_COMPAT
1242 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
1243 char __user *optval, unsigned int optlen)
1244 {
1245 if (level == SOL_UDP || level == SOL_UDPLITE)
1246 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1247 udp_v6_push_pending_frames);
1248 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
1249 }
1250 #endif
1251
1252 int udpv6_getsockopt(struct sock *sk, int level, int optname,
1253 char __user *optval, int __user *optlen)
1254 {
1255 if (level == SOL_UDP || level == SOL_UDPLITE)
1256 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1257 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1258 }
1259
1260 #ifdef CONFIG_COMPAT
1261 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
1262 char __user *optval, int __user *optlen)
1263 {
1264 if (level == SOL_UDP || level == SOL_UDPLITE)
1265 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1266 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
1267 }
1268 #endif
1269
1270 static int udp6_ufo_send_check(struct sk_buff *skb)
1271 {
1272 struct ipv6hdr *ipv6h;
1273 struct udphdr *uh;
1274
1275 if (!pskb_may_pull(skb, sizeof(*uh)))
1276 return -EINVAL;
1277
1278 ipv6h = ipv6_hdr(skb);
1279 uh = udp_hdr(skb);
1280
1281 uh->check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr, skb->len,
1282 IPPROTO_UDP, 0);
1283 skb->csum_start = skb_transport_header(skb) - skb->head;
1284 skb->csum_offset = offsetof(struct udphdr, check);
1285 skb->ip_summed = CHECKSUM_PARTIAL;
1286 return 0;
1287 }
1288
1289 static struct sk_buff *udp6_ufo_fragment(struct sk_buff *skb, int features)
1290 {
1291 struct sk_buff *segs = ERR_PTR(-EINVAL);
1292 unsigned int mss;
1293 unsigned int unfrag_ip6hlen, unfrag_len;
1294 struct frag_hdr *fptr;
1295 u8 *mac_start, *prevhdr;
1296 u8 nexthdr;
1297 u8 frag_hdr_sz = sizeof(struct frag_hdr);
1298 int offset;
1299 __wsum csum;
1300
1301 mss = skb_shinfo(skb)->gso_size;
1302 if (unlikely(skb->len <= mss))
1303 goto out;
1304
1305 if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) {
1306 /* Packet is from an untrusted source, reset gso_segs. */
1307 int type = skb_shinfo(skb)->gso_type;
1308
1309 if (unlikely(type & ~(SKB_GSO_UDP | SKB_GSO_DODGY) ||
1310 !(type & (SKB_GSO_UDP))))
1311 goto out;
1312
1313 skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(skb->len, mss);
1314
1315 segs = NULL;
1316 goto out;
1317 }
1318
1319 /* Do software UFO. Complete and fill in the UDP checksum as HW cannot
1320 * do checksum of UDP packets sent as multiple IP fragments.
1321 */
1322 offset = skb->csum_start - skb_headroom(skb);
1323 csum = skb_checksum(skb, offset, skb->len- offset, 0);
1324 offset += skb->csum_offset;
1325 *(__sum16 *)(skb->data + offset) = csum_fold(csum);
1326 skb->ip_summed = CHECKSUM_NONE;
1327
1328 /* Check if there is enough headroom to insert fragment header. */
1329 if ((skb_headroom(skb) < frag_hdr_sz) &&
1330 pskb_expand_head(skb, frag_hdr_sz, 0, GFP_ATOMIC))
1331 goto out;
1332
1333 /* Find the unfragmentable header and shift it left by frag_hdr_sz
1334 * bytes to insert fragment header.
1335 */
1336 unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr);
1337 nexthdr = *prevhdr;
1338 *prevhdr = NEXTHDR_FRAGMENT;
1339 unfrag_len = skb_network_header(skb) - skb_mac_header(skb) +
1340 unfrag_ip6hlen;
1341 mac_start = skb_mac_header(skb);
1342 memmove(mac_start-frag_hdr_sz, mac_start, unfrag_len);
1343
1344 skb->mac_header -= frag_hdr_sz;
1345 skb->network_header -= frag_hdr_sz;
1346
1347 fptr = (struct frag_hdr *)(skb_network_header(skb) + unfrag_ip6hlen);
1348 fptr->nexthdr = nexthdr;
1349 fptr->reserved = 0;
1350 ipv6_select_ident(fptr);
1351
1352 /* Fragment the skb. ipv6 header and the remaining fields of the
1353 * fragment header are updated in ipv6_gso_segment()
1354 */
1355 segs = skb_segment(skb, features);
1356
1357 out:
1358 return segs;
1359 }
1360
1361 static const struct inet6_protocol udpv6_protocol = {
1362 .handler = udpv6_rcv,
1363 .err_handler = udpv6_err,
1364 .gso_send_check = udp6_ufo_send_check,
1365 .gso_segment = udp6_ufo_fragment,
1366 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1367 };
1368
1369 /* ------------------------------------------------------------------------ */
1370 #ifdef CONFIG_PROC_FS
1371
1372 static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket)
1373 {
1374 struct inet_sock *inet = inet_sk(sp);
1375 struct ipv6_pinfo *np = inet6_sk(sp);
1376 struct in6_addr *dest, *src;
1377 __u16 destp, srcp;
1378
1379 dest = &np->daddr;
1380 src = &np->rcv_saddr;
1381 destp = ntohs(inet->inet_dport);
1382 srcp = ntohs(inet->inet_sport);
1383 seq_printf(seq,
1384 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1385 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %d\n",
1386 bucket,
1387 src->s6_addr32[0], src->s6_addr32[1],
1388 src->s6_addr32[2], src->s6_addr32[3], srcp,
1389 dest->s6_addr32[0], dest->s6_addr32[1],
1390 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1391 sp->sk_state,
1392 sk_wmem_alloc_get(sp),
1393 sk_rmem_alloc_get(sp),
1394 0, 0L, 0,
1395 sock_i_uid(sp), 0,
1396 sock_i_ino(sp),
1397 atomic_read(&sp->sk_refcnt), sp,
1398 atomic_read(&sp->sk_drops));
1399 }
1400
1401 int udp6_seq_show(struct seq_file *seq, void *v)
1402 {
1403 if (v == SEQ_START_TOKEN)
1404 seq_printf(seq,
1405 " sl "
1406 "local_address "
1407 "remote_address "
1408 "st tx_queue rx_queue tr tm->when retrnsmt"
1409 " uid timeout inode ref pointer drops\n");
1410 else
1411 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket);
1412 return 0;
1413 }
1414
1415 static struct udp_seq_afinfo udp6_seq_afinfo = {
1416 .name = "udp6",
1417 .family = AF_INET6,
1418 .udp_table = &udp_table,
1419 .seq_fops = {
1420 .owner = THIS_MODULE,
1421 },
1422 .seq_ops = {
1423 .show = udp6_seq_show,
1424 },
1425 };
1426
1427 int __net_init udp6_proc_init(struct net *net)
1428 {
1429 return udp_proc_register(net, &udp6_seq_afinfo);
1430 }
1431
1432 void udp6_proc_exit(struct net *net) {
1433 udp_proc_unregister(net, &udp6_seq_afinfo);
1434 }
1435 #endif /* CONFIG_PROC_FS */
1436
1437 /* ------------------------------------------------------------------------ */
1438
1439 struct proto udpv6_prot = {
1440 .name = "UDPv6",
1441 .owner = THIS_MODULE,
1442 .close = udp_lib_close,
1443 .connect = ip6_datagram_connect,
1444 .disconnect = udp_disconnect,
1445 .ioctl = udp_ioctl,
1446 .destroy = udpv6_destroy_sock,
1447 .setsockopt = udpv6_setsockopt,
1448 .getsockopt = udpv6_getsockopt,
1449 .sendmsg = udpv6_sendmsg,
1450 .recvmsg = udpv6_recvmsg,
1451 .backlog_rcv = udpv6_queue_rcv_skb,
1452 .hash = udp_lib_hash,
1453 .unhash = udp_lib_unhash,
1454 .get_port = udp_v6_get_port,
1455 .memory_allocated = &udp_memory_allocated,
1456 .sysctl_mem = sysctl_udp_mem,
1457 .sysctl_wmem = &sysctl_udp_wmem_min,
1458 .sysctl_rmem = &sysctl_udp_rmem_min,
1459 .obj_size = sizeof(struct udp6_sock),
1460 .slab_flags = SLAB_DESTROY_BY_RCU,
1461 .h.udp_table = &udp_table,
1462 #ifdef CONFIG_COMPAT
1463 .compat_setsockopt = compat_udpv6_setsockopt,
1464 .compat_getsockopt = compat_udpv6_getsockopt,
1465 #endif
1466 };
1467
1468 static struct inet_protosw udpv6_protosw = {
1469 .type = SOCK_DGRAM,
1470 .protocol = IPPROTO_UDP,
1471 .prot = &udpv6_prot,
1472 .ops = &inet6_dgram_ops,
1473 .no_check = UDP_CSUM_DEFAULT,
1474 .flags = INET_PROTOSW_PERMANENT,
1475 };
1476
1477
1478 int __init udpv6_init(void)
1479 {
1480 int ret;
1481
1482 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
1483 if (ret)
1484 goto out;
1485
1486 ret = inet6_register_protosw(&udpv6_protosw);
1487 if (ret)
1488 goto out_udpv6_protocol;
1489 out:
1490 return ret;
1491
1492 out_udpv6_protocol:
1493 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1494 goto out;
1495 }
1496
1497 void udpv6_exit(void)
1498 {
1499 inet6_unregister_protosw(&udpv6_protosw);
1500 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1501 }
Linux kernel - Deliverables
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