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arcmsr_hba: Missing slab.h include
[zen-stable.git] / net / ipv6 / udp.c
blob1dd1affdead2d418a3d98a0f34e5d027cab88371
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 bool slow;
332
333 if (addr_len)
334 *addr_len=sizeof(struct sockaddr_in6);
335
336 if (flags & MSG_ERRQUEUE)
337 return ipv6_recv_error(sk, msg, len);
338
339 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
340 return ipv6_recv_rxpmtu(sk, msg, len);
341
342 try_again:
343 skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),
344 &peeked, &err);
345 if (!skb)
346 goto out;
347
348 ulen = skb->len - sizeof(struct udphdr);
349 if (len > ulen)
350 len = ulen;
351 else if (len < ulen)
352 msg->msg_flags |= MSG_TRUNC;
353
354 is_udp4 = (skb->protocol == htons(ETH_P_IP));
355
356 /*
357 * If checksum is needed at all, try to do it while copying the
358 * data. If the data is truncated, or if we only want a partial
359 * coverage checksum (UDP-Lite), do it before the copy.
360 */
361
362 if (len < ulen || UDP_SKB_CB(skb)->partial_cov) {
363 if (udp_lib_checksum_complete(skb))
364 goto csum_copy_err;
365 }
366
367 if (skb_csum_unnecessary(skb))
368 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr),
369 msg->msg_iov,len);
370 else {
371 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
372 if (err == -EINVAL)
373 goto csum_copy_err;
374 }
375 if (err)
376 goto out_free;
377
378 if (!peeked) {
379 if (is_udp4)
380 UDP_INC_STATS_USER(sock_net(sk),
381 UDP_MIB_INDATAGRAMS, is_udplite);
382 else
383 UDP6_INC_STATS_USER(sock_net(sk),
384 UDP_MIB_INDATAGRAMS, is_udplite);
385 }
386
387 sock_recv_ts_and_drops(msg, sk, skb);
388
389 /* Copy the address. */
390 if (msg->msg_name) {
391 struct sockaddr_in6 *sin6;
392
393 sin6 = (struct sockaddr_in6 *) msg->msg_name;
394 sin6->sin6_family = AF_INET6;
395 sin6->sin6_port = udp_hdr(skb)->source;
396 sin6->sin6_flowinfo = 0;
397 sin6->sin6_scope_id = 0;
398
399 if (is_udp4)
400 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
401 &sin6->sin6_addr);
402 else {
403 ipv6_addr_copy(&sin6->sin6_addr,
404 &ipv6_hdr(skb)->saddr);
405 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
406 sin6->sin6_scope_id = IP6CB(skb)->iif;
407 }
408
409 }
410 if (is_udp4) {
411 if (inet->cmsg_flags)
412 ip_cmsg_recv(msg, skb);
413 } else {
414 if (np->rxopt.all)
415 datagram_recv_ctl(sk, msg, skb);
416 }
417
418 err = len;
419 if (flags & MSG_TRUNC)
420 err = ulen;
421
422 out_free:
423 skb_free_datagram_locked(sk, skb);
424 out:
425 return err;
426
427 csum_copy_err:
428 slow = lock_sock_fast(sk);
429 if (!skb_kill_datagram(sk, skb, flags)) {
430 if (is_udp4)
431 UDP_INC_STATS_USER(sock_net(sk),
432 UDP_MIB_INERRORS, is_udplite);
433 else
434 UDP6_INC_STATS_USER(sock_net(sk),
435 UDP_MIB_INERRORS, is_udplite);
436 }
437 unlock_sock_fast(sk, slow);
438
439 if (flags & MSG_DONTWAIT)
440 return -EAGAIN;
441 goto try_again;
442 }
443
444 void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
445 u8 type, u8 code, int offset, __be32 info,
446 struct udp_table *udptable)
447 {
448 struct ipv6_pinfo *np;
449 struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data;
450 struct in6_addr *saddr = &hdr->saddr;
451 struct in6_addr *daddr = &hdr->daddr;
452 struct udphdr *uh = (struct udphdr*)(skb->data+offset);
453 struct sock *sk;
454 int err;
455
456 sk = __udp6_lib_lookup(dev_net(skb->dev), daddr, uh->dest,
457 saddr, uh->source, inet6_iif(skb), udptable);
458 if (sk == NULL)
459 return;
460
461 np = inet6_sk(sk);
462
463 if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
464 goto out;
465
466 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
467 goto out;
468
469 if (np->recverr)
470 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
471
472 sk->sk_err = err;
473 sk->sk_error_report(sk);
474 out:
475 sock_put(sk);
476 }
477
478 static __inline__ void udpv6_err(struct sk_buff *skb,
479 struct inet6_skb_parm *opt, u8 type,
480 u8 code, int offset, __be32 info )
481 {
482 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table);
483 }
484
485 int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
486 {
487 struct udp_sock *up = udp_sk(sk);
488 int rc;
489 int is_udplite = IS_UDPLITE(sk);
490
491 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
492 goto drop;
493
494 /*
495 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
496 */
497 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
498
499 if (up->pcrlen == 0) { /* full coverage was set */
500 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage"
501 " %d while full coverage %d requested\n",
502 UDP_SKB_CB(skb)->cscov, skb->len);
503 goto drop;
504 }
505 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
506 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d "
507 "too small, need min %d\n",
508 UDP_SKB_CB(skb)->cscov, up->pcrlen);
509 goto drop;
510 }
511 }
512
513 if (sk->sk_filter) {
514 if (udp_lib_checksum_complete(skb))
515 goto drop;
516 }
517
518 if ((rc = ip_queue_rcv_skb(sk, skb)) < 0) {
519 /* Note that an ENOMEM error is charged twice */
520 if (rc == -ENOMEM)
521 UDP6_INC_STATS_BH(sock_net(sk),
522 UDP_MIB_RCVBUFERRORS, is_udplite);
523 goto drop_no_sk_drops_inc;
524 }
525
526 return 0;
527 drop:
528 atomic_inc(&sk->sk_drops);
529 drop_no_sk_drops_inc:
530 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
531 kfree_skb(skb);
532 return -1;
533 }
534
535 static struct sock *udp_v6_mcast_next(struct net *net, struct sock *sk,
536 __be16 loc_port, struct in6_addr *loc_addr,
537 __be16 rmt_port, struct in6_addr *rmt_addr,
538 int dif)
539 {
540 struct hlist_nulls_node *node;
541 struct sock *s = sk;
542 unsigned short num = ntohs(loc_port);
543
544 sk_nulls_for_each_from(s, node) {
545 struct inet_sock *inet = inet_sk(s);
546
547 if (!net_eq(sock_net(s), net))
548 continue;
549
550 if (udp_sk(s)->udp_port_hash == num &&
551 s->sk_family == PF_INET6) {
552 struct ipv6_pinfo *np = inet6_sk(s);
553 if (inet->inet_dport) {
554 if (inet->inet_dport != rmt_port)
555 continue;
556 }
557 if (!ipv6_addr_any(&np->daddr) &&
558 !ipv6_addr_equal(&np->daddr, rmt_addr))
559 continue;
560
561 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)
562 continue;
563
564 if (!ipv6_addr_any(&np->rcv_saddr)) {
565 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr))
566 continue;
567 }
568 if (!inet6_mc_check(s, loc_addr, rmt_addr))
569 continue;
570 return s;
571 }
572 }
573 return NULL;
574 }
575
576 static void flush_stack(struct sock **stack, unsigned int count,
577 struct sk_buff *skb, unsigned int final)
578 {
579 unsigned int i;
580 struct sock *sk;
581 struct sk_buff *skb1;
582
583 for (i = 0; i < count; i++) {
584 skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC);
585
586 sk = stack[i];
587 if (skb1) {
588 if (sk_rcvqueues_full(sk, skb)) {
589 kfree_skb(skb1);
590 goto drop;
591 }
592 bh_lock_sock(sk);
593 if (!sock_owned_by_user(sk))
594 udpv6_queue_rcv_skb(sk, skb1);
595 else if (sk_add_backlog(sk, skb1)) {
596 kfree_skb(skb1);
597 bh_unlock_sock(sk);
598 goto drop;
599 }
600 bh_unlock_sock(sk);
601 continue;
602 }
603 drop:
604 atomic_inc(&sk->sk_drops);
605 UDP6_INC_STATS_BH(sock_net(sk),
606 UDP_MIB_RCVBUFERRORS, IS_UDPLITE(sk));
607 UDP6_INC_STATS_BH(sock_net(sk),
608 UDP_MIB_INERRORS, IS_UDPLITE(sk));
609 }
610 }
611 /*
612 * Note: called only from the BH handler context,
613 * so we don't need to lock the hashes.
614 */
615 static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
616 struct in6_addr *saddr, struct in6_addr *daddr,
617 struct udp_table *udptable)
618 {
619 struct sock *sk, *stack[256 / sizeof(struct sock *)];
620 const struct udphdr *uh = udp_hdr(skb);
621 struct udp_hslot *hslot = udp_hashslot(udptable, net, ntohs(uh->dest));
622 int dif;
623 unsigned int i, count = 0;
624
625 spin_lock(&hslot->lock);
626 sk = sk_nulls_head(&hslot->head);
627 dif = inet6_iif(skb);
628 sk = udp_v6_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif);
629 while (sk) {
630 stack[count++] = sk;
631 sk = udp_v6_mcast_next(net, sk_nulls_next(sk), uh->dest, daddr,
632 uh->source, saddr, dif);
633 if (unlikely(count == ARRAY_SIZE(stack))) {
634 if (!sk)
635 break;
636 flush_stack(stack, count, skb, ~0);
637 count = 0;
638 }
639 }
640 /*
641 * before releasing the lock, we must take reference on sockets
642 */
643 for (i = 0; i < count; i++)
644 sock_hold(stack[i]);
645
646 spin_unlock(&hslot->lock);
647
648 if (count) {
649 flush_stack(stack, count, skb, count - 1);
650
651 for (i = 0; i < count; i++)
652 sock_put(stack[i]);
653 } else {
654 kfree_skb(skb);
655 }
656 return 0;
657 }
658
659 static inline int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh,
660 int proto)
661 {
662 int err;
663
664 UDP_SKB_CB(skb)->partial_cov = 0;
665 UDP_SKB_CB(skb)->cscov = skb->len;
666
667 if (proto == IPPROTO_UDPLITE) {
668 err = udplite_checksum_init(skb, uh);
669 if (err)
670 return err;
671 }
672
673 if (uh->check == 0) {
674 /* RFC 2460 section 8.1 says that we SHOULD log
675 this error. Well, it is reasonable.
676 */
677 LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n");
678 return 1;
679 }
680 if (skb->ip_summed == CHECKSUM_COMPLETE &&
681 !csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
682 skb->len, proto, skb->csum))
683 skb->ip_summed = CHECKSUM_UNNECESSARY;
684
685 if (!skb_csum_unnecessary(skb))
686 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
687 &ipv6_hdr(skb)->daddr,
688 skb->len, proto, 0));
689
690 return 0;
691 }
692
693 int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
694 int proto)
695 {
696 struct net *net = dev_net(skb->dev);
697 struct sock *sk;
698 struct udphdr *uh;
699 struct in6_addr *saddr, *daddr;
700 u32 ulen = 0;
701
702 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
703 goto discard;
704
705 saddr = &ipv6_hdr(skb)->saddr;
706 daddr = &ipv6_hdr(skb)->daddr;
707 uh = udp_hdr(skb);
708
709 ulen = ntohs(uh->len);
710 if (ulen > skb->len)
711 goto short_packet;
712
713 if (proto == IPPROTO_UDP) {
714 /* UDP validates ulen. */
715
716 /* Check for jumbo payload */
717 if (ulen == 0)
718 ulen = skb->len;
719
720 if (ulen < sizeof(*uh))
721 goto short_packet;
722
723 if (ulen < skb->len) {
724 if (pskb_trim_rcsum(skb, ulen))
725 goto short_packet;
726 saddr = &ipv6_hdr(skb)->saddr;
727 daddr = &ipv6_hdr(skb)->daddr;
728 uh = udp_hdr(skb);
729 }
730 }
731
732 if (udp6_csum_init(skb, uh, proto))
733 goto discard;
734
735 /*
736 * Multicast receive code
737 */
738 if (ipv6_addr_is_multicast(daddr))
739 return __udp6_lib_mcast_deliver(net, skb,
740 saddr, daddr, udptable);
741
742 /* Unicast */
743
744 /*
745 * check socket cache ... must talk to Alan about his plans
746 * for sock caches... i'll skip this for now.
747 */
748 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
749
750 if (sk == NULL) {
751 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
752 goto discard;
753
754 if (udp_lib_checksum_complete(skb))
755 goto discard;
756 UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS,
757 proto == IPPROTO_UDPLITE);
758
759 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
760
761 kfree_skb(skb);
762 return 0;
763 }
764
765 /* deliver */
766
767 if (sk_rcvqueues_full(sk, skb)) {
768 sock_put(sk);
769 goto discard;
770 }
771 bh_lock_sock(sk);
772 if (!sock_owned_by_user(sk))
773 udpv6_queue_rcv_skb(sk, skb);
774 else if (sk_add_backlog(sk, skb)) {
775 atomic_inc(&sk->sk_drops);
776 bh_unlock_sock(sk);
777 sock_put(sk);
778 goto discard;
779 }
780 bh_unlock_sock(sk);
781 sock_put(sk);
782 return 0;
783
784 short_packet:
785 LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n",
786 proto == IPPROTO_UDPLITE ? "-Lite" : "",
787 saddr,
788 ntohs(uh->source),
789 ulen,
790 skb->len,
791 daddr,
792 ntohs(uh->dest));
793
794 discard:
795 UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
796 kfree_skb(skb);
797 return 0;
798 }
799
800 static __inline__ int udpv6_rcv(struct sk_buff *skb)
801 {
802 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP);
803 }
804
805 /*
806 * Throw away all pending data and cancel the corking. Socket is locked.
807 */
808 static void udp_v6_flush_pending_frames(struct sock *sk)
809 {
810 struct udp_sock *up = udp_sk(sk);
811
812 if (up->pending == AF_INET)
813 udp_flush_pending_frames(sk);
814 else if (up->pending) {
815 up->len = 0;
816 up->pending = 0;
817 ip6_flush_pending_frames(sk);
818 }
819 }
820
821 /**
822 * udp6_hwcsum_outgoing - handle outgoing HW checksumming
823 * @sk: socket we are sending on
824 * @skb: sk_buff containing the filled-in UDP header
825 * (checksum field must be zeroed out)
826 */
827 static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
828 const struct in6_addr *saddr,
829 const struct in6_addr *daddr, int len)
830 {
831 unsigned int offset;
832 struct udphdr *uh = udp_hdr(skb);
833 __wsum csum = 0;
834
835 if (skb_queue_len(&sk->sk_write_queue) == 1) {
836 /* Only one fragment on the socket. */
837 skb->csum_start = skb_transport_header(skb) - skb->head;
838 skb->csum_offset = offsetof(struct udphdr, check);
839 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0);
840 } else {
841 /*
842 * HW-checksum won't work as there are two or more
843 * fragments on the socket so that all csums of sk_buffs
844 * should be together
845 */
846 offset = skb_transport_offset(skb);
847 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
848
849 skb->ip_summed = CHECKSUM_NONE;
850
851 skb_queue_walk(&sk->sk_write_queue, skb) {
852 csum = csum_add(csum, skb->csum);
853 }
854
855 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP,
856 csum);
857 if (uh->check == 0)
858 uh->check = CSUM_MANGLED_0;
859 }
860 }
861
862 /*
863 * Sending
864 */
865
866 static int udp_v6_push_pending_frames(struct sock *sk)
867 {
868 struct sk_buff *skb;
869 struct udphdr *uh;
870 struct udp_sock *up = udp_sk(sk);
871 struct inet_sock *inet = inet_sk(sk);
872 struct flowi *fl = &inet->cork.fl;
873 int err = 0;
874 int is_udplite = IS_UDPLITE(sk);
875 __wsum csum = 0;
876
877 /* Grab the skbuff where UDP header space exists. */
878 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
879 goto out;
880
881 /*
882 * Create a UDP header
883 */
884 uh = udp_hdr(skb);
885 uh->source = fl->fl_ip_sport;
886 uh->dest = fl->fl_ip_dport;
887 uh->len = htons(up->len);
888 uh->check = 0;
889
890 if (is_udplite)
891 csum = udplite_csum_outgoing(sk, skb);
892 else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
893 udp6_hwcsum_outgoing(sk, skb, &fl->fl6_src, &fl->fl6_dst,
894 up->len);
895 goto send;
896 } else
897 csum = udp_csum_outgoing(sk, skb);
898
899 /* add protocol-dependent pseudo-header */
900 uh->check = csum_ipv6_magic(&fl->fl6_src, &fl->fl6_dst,
901 up->len, fl->proto, csum );
902 if (uh->check == 0)
903 uh->check = CSUM_MANGLED_0;
904
905 send:
906 err = ip6_push_pending_frames(sk);
907 if (err) {
908 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) {
909 UDP6_INC_STATS_USER(sock_net(sk),
910 UDP_MIB_SNDBUFERRORS, is_udplite);
911 err = 0;
912 }
913 } else
914 UDP6_INC_STATS_USER(sock_net(sk),
915 UDP_MIB_OUTDATAGRAMS, is_udplite);
916 out:
917 up->len = 0;
918 up->pending = 0;
919 return err;
920 }
921
922 int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
923 struct msghdr *msg, size_t len)
924 {
925 struct ipv6_txoptions opt_space;
926 struct udp_sock *up = udp_sk(sk);
927 struct inet_sock *inet = inet_sk(sk);
928 struct ipv6_pinfo *np = inet6_sk(sk);
929 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
930 struct in6_addr *daddr, *final_p, final;
931 struct ipv6_txoptions *opt = NULL;
932 struct ip6_flowlabel *flowlabel = NULL;
933 struct flowi fl;
934 struct dst_entry *dst;
935 int addr_len = msg->msg_namelen;
936 int ulen = len;
937 int hlimit = -1;
938 int tclass = -1;
939 int dontfrag = -1;
940 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
941 int err;
942 int connected = 0;
943 int is_udplite = IS_UDPLITE(sk);
944 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
945
946 /* destination address check */
947 if (sin6) {
948 if (addr_len < offsetof(struct sockaddr, sa_data))
949 return -EINVAL;
950
951 switch (sin6->sin6_family) {
952 case AF_INET6:
953 if (addr_len < SIN6_LEN_RFC2133)
954 return -EINVAL;
955 daddr = &sin6->sin6_addr;
956 break;
957 case AF_INET:
958 goto do_udp_sendmsg;
959 case AF_UNSPEC:
960 msg->msg_name = sin6 = NULL;
961 msg->msg_namelen = addr_len = 0;
962 daddr = NULL;
963 break;
964 default:
965 return -EINVAL;
966 }
967 } else if (!up->pending) {
968 if (sk->sk_state != TCP_ESTABLISHED)
969 return -EDESTADDRREQ;
970 daddr = &np->daddr;
971 } else
972 daddr = NULL;
973
974 if (daddr) {
975 if (ipv6_addr_v4mapped(daddr)) {
976 struct sockaddr_in sin;
977 sin.sin_family = AF_INET;
978 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport;
979 sin.sin_addr.s_addr = daddr->s6_addr32[3];
980 msg->msg_name = &sin;
981 msg->msg_namelen = sizeof(sin);
982 do_udp_sendmsg:
983 if (__ipv6_only_sock(sk))
984 return -ENETUNREACH;
985 return udp_sendmsg(iocb, sk, msg, len);
986 }
987 }
988
989 if (up->pending == AF_INET)
990 return udp_sendmsg(iocb, sk, msg, len);
991
992 /* Rough check on arithmetic overflow,
993 better check is made in ip6_append_data().
994 */
995 if (len > INT_MAX - sizeof(struct udphdr))
996 return -EMSGSIZE;
997
998 if (up->pending) {
999 /*
1000 * There are pending frames.
1001 * The socket lock must be held while it's corked.
1002 */
1003 lock_sock(sk);
1004 if (likely(up->pending)) {
1005 if (unlikely(up->pending != AF_INET6)) {
1006 release_sock(sk);
1007 return -EAFNOSUPPORT;
1008 }
1009 dst = NULL;
1010 goto do_append_data;
1011 }
1012 release_sock(sk);
1013 }
1014 ulen += sizeof(struct udphdr);
1015
1016 memset(&fl, 0, sizeof(fl));
1017
1018 if (sin6) {
1019 if (sin6->sin6_port == 0)
1020 return -EINVAL;
1021
1022 fl.fl_ip_dport = sin6->sin6_port;
1023 daddr = &sin6->sin6_addr;
1024
1025 if (np->sndflow) {
1026 fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
1027 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
1028 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
1029 if (flowlabel == NULL)
1030 return -EINVAL;
1031 daddr = &flowlabel->dst;
1032 }
1033 }
1034
1035 /*
1036 * Otherwise it will be difficult to maintain
1037 * sk->sk_dst_cache.
1038 */
1039 if (sk->sk_state == TCP_ESTABLISHED &&
1040 ipv6_addr_equal(daddr, &np->daddr))
1041 daddr = &np->daddr;
1042
1043 if (addr_len >= sizeof(struct sockaddr_in6) &&
1044 sin6->sin6_scope_id &&
1045 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
1046 fl.oif = sin6->sin6_scope_id;
1047 } else {
1048 if (sk->sk_state != TCP_ESTABLISHED)
1049 return -EDESTADDRREQ;
1050
1051 fl.fl_ip_dport = inet->inet_dport;
1052 daddr = &np->daddr;
1053 fl.fl6_flowlabel = np->flow_label;
1054 connected = 1;
1055 }
1056
1057 if (!fl.oif)
1058 fl.oif = sk->sk_bound_dev_if;
1059
1060 if (!fl.oif)
1061 fl.oif = np->sticky_pktinfo.ipi6_ifindex;
1062
1063 fl.mark = sk->sk_mark;
1064
1065 if (msg->msg_controllen) {
1066 opt = &opt_space;
1067 memset(opt, 0, sizeof(struct ipv6_txoptions));
1068 opt->tot_len = sizeof(*opt);
1069
1070 err = datagram_send_ctl(sock_net(sk), msg, &fl, opt, &hlimit,
1071 &tclass, &dontfrag);
1072 if (err < 0) {
1073 fl6_sock_release(flowlabel);
1074 return err;
1075 }
1076 if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
1077 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
1078 if (flowlabel == NULL)
1079 return -EINVAL;
1080 }
1081 if (!(opt->opt_nflen|opt->opt_flen))
1082 opt = NULL;
1083 connected = 0;
1084 }
1085 if (opt == NULL)
1086 opt = np->opt;
1087 if (flowlabel)
1088 opt = fl6_merge_options(&opt_space, flowlabel, opt);
1089 opt = ipv6_fixup_options(&opt_space, opt);
1090
1091 fl.proto = sk->sk_protocol;
1092 if (!ipv6_addr_any(daddr))
1093 ipv6_addr_copy(&fl.fl6_dst, daddr);
1094 else
1095 fl.fl6_dst.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
1096 if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr))
1097 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
1098 fl.fl_ip_sport = inet->inet_sport;
1099
1100 final_p = fl6_update_dst(&fl, opt, &final);
1101 if (final_p)
1102 connected = 0;
1103
1104 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) {
1105 fl.oif = np->mcast_oif;
1106 connected = 0;
1107 }
1108
1109 security_sk_classify_flow(sk, &fl);
1110
1111 err = ip6_sk_dst_lookup(sk, &dst, &fl);
1112 if (err)
1113 goto out;
1114 if (final_p)
1115 ipv6_addr_copy(&fl.fl6_dst, final_p);
1116
1117 err = __xfrm_lookup(sock_net(sk), &dst, &fl, sk, XFRM_LOOKUP_WAIT);
1118 if (err < 0) {
1119 if (err == -EREMOTE)
1120 err = ip6_dst_blackhole(sk, &dst, &fl);
1121 if (err < 0)
1122 goto out;
1123 }
1124
1125 if (hlimit < 0) {
1126 if (ipv6_addr_is_multicast(&fl.fl6_dst))
1127 hlimit = np->mcast_hops;
1128 else
1129 hlimit = np->hop_limit;
1130 if (hlimit < 0)
1131 hlimit = ip6_dst_hoplimit(dst);
1132 }
1133
1134 if (tclass < 0)
1135 tclass = np->tclass;
1136
1137 if (dontfrag < 0)
1138 dontfrag = np->dontfrag;
1139
1140 if (msg->msg_flags&MSG_CONFIRM)
1141 goto do_confirm;
1142 back_from_confirm:
1143
1144 lock_sock(sk);
1145 if (unlikely(up->pending)) {
1146 /* The socket is already corked while preparing it. */
1147 /* ... which is an evident application bug. --ANK */
1148 release_sock(sk);
1149
1150 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
1151 err = -EINVAL;
1152 goto out;
1153 }
1154
1155 up->pending = AF_INET6;
1156
1157 do_append_data:
1158 up->len += ulen;
1159 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
1160 err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen,
1161 sizeof(struct udphdr), hlimit, tclass, opt, &fl,
1162 (struct rt6_info*)dst,
1163 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, dontfrag);
1164 if (err)
1165 udp_v6_flush_pending_frames(sk);
1166 else if (!corkreq)
1167 err = udp_v6_push_pending_frames(sk);
1168 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
1169 up->pending = 0;
1170
1171 if (dst) {
1172 if (connected) {
1173 ip6_dst_store(sk, dst,
1174 ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ?
1175 &np->daddr : NULL,
1176 #ifdef CONFIG_IPV6_SUBTREES
1177 ipv6_addr_equal(&fl.fl6_src, &np->saddr) ?
1178 &np->saddr :
1179 #endif
1180 NULL);
1181 } else {
1182 dst_release(dst);
1183 }
1184 dst = NULL;
1185 }
1186
1187 if (err > 0)
1188 err = np->recverr ? net_xmit_errno(err) : 0;
1189 release_sock(sk);
1190 out:
1191 dst_release(dst);
1192 fl6_sock_release(flowlabel);
1193 if (!err)
1194 return len;
1195 /*
1196 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
1197 * ENOBUFS might not be good (it's not tunable per se), but otherwise
1198 * we don't have a good statistic (IpOutDiscards but it can be too many
1199 * things). We could add another new stat but at least for now that
1200 * seems like overkill.
1201 */
1202 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
1203 UDP6_INC_STATS_USER(sock_net(sk),
1204 UDP_MIB_SNDBUFERRORS, is_udplite);
1205 }
1206 return err;
1207
1208 do_confirm:
1209 dst_confirm(dst);
1210 if (!(msg->msg_flags&MSG_PROBE) || len)
1211 goto back_from_confirm;
1212 err = 0;
1213 goto out;
1214 }
1215
1216 void udpv6_destroy_sock(struct sock *sk)
1217 {
1218 lock_sock(sk);
1219 udp_v6_flush_pending_frames(sk);
1220 release_sock(sk);
1221
1222 inet6_destroy_sock(sk);
1223 }
1224
1225 /*
1226 * Socket option code for UDP
1227 */
1228 int udpv6_setsockopt(struct sock *sk, int level, int optname,
1229 char __user *optval, unsigned int optlen)
1230 {
1231 if (level == SOL_UDP || level == SOL_UDPLITE)
1232 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1233 udp_v6_push_pending_frames);
1234 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1235 }
1236
1237 #ifdef CONFIG_COMPAT
1238 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
1239 char __user *optval, unsigned int optlen)
1240 {
1241 if (level == SOL_UDP || level == SOL_UDPLITE)
1242 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1243 udp_v6_push_pending_frames);
1244 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
1245 }
1246 #endif
1247
1248 int udpv6_getsockopt(struct sock *sk, int level, int optname,
1249 char __user *optval, int __user *optlen)
1250 {
1251 if (level == SOL_UDP || level == SOL_UDPLITE)
1252 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1253 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1254 }
1255
1256 #ifdef CONFIG_COMPAT
1257 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
1258 char __user *optval, int __user *optlen)
1259 {
1260 if (level == SOL_UDP || level == SOL_UDPLITE)
1261 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1262 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
1263 }
1264 #endif
1265
1266 static int udp6_ufo_send_check(struct sk_buff *skb)
1267 {
1268 struct ipv6hdr *ipv6h;
1269 struct udphdr *uh;
1270
1271 if (!pskb_may_pull(skb, sizeof(*uh)))
1272 return -EINVAL;
1273
1274 ipv6h = ipv6_hdr(skb);
1275 uh = udp_hdr(skb);
1276
1277 uh->check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr, skb->len,
1278 IPPROTO_UDP, 0);
1279 skb->csum_start = skb_transport_header(skb) - skb->head;
1280 skb->csum_offset = offsetof(struct udphdr, check);
1281 skb->ip_summed = CHECKSUM_PARTIAL;
1282 return 0;
1283 }
1284
1285 static struct sk_buff *udp6_ufo_fragment(struct sk_buff *skb, int features)
1286 {
1287 struct sk_buff *segs = ERR_PTR(-EINVAL);
1288 unsigned int mss;
1289 unsigned int unfrag_ip6hlen, unfrag_len;
1290 struct frag_hdr *fptr;
1291 u8 *mac_start, *prevhdr;
1292 u8 nexthdr;
1293 u8 frag_hdr_sz = sizeof(struct frag_hdr);
1294 int offset;
1295 __wsum csum;
1296
1297 mss = skb_shinfo(skb)->gso_size;
1298 if (unlikely(skb->len <= mss))
1299 goto out;
1300
1301 if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) {
1302 /* Packet is from an untrusted source, reset gso_segs. */
1303 int type = skb_shinfo(skb)->gso_type;
1304
1305 if (unlikely(type & ~(SKB_GSO_UDP | SKB_GSO_DODGY) ||
1306 !(type & (SKB_GSO_UDP))))
1307 goto out;
1308
1309 skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(skb->len, mss);
1310
1311 segs = NULL;
1312 goto out;
1313 }
1314
1315 /* Do software UFO. Complete and fill in the UDP checksum as HW cannot
1316 * do checksum of UDP packets sent as multiple IP fragments.
1317 */
1318 offset = skb->csum_start - skb_headroom(skb);
1319 csum = skb_checksum(skb, offset, skb->len- offset, 0);
1320 offset += skb->csum_offset;
1321 *(__sum16 *)(skb->data + offset) = csum_fold(csum);
1322 skb->ip_summed = CHECKSUM_NONE;
1323
1324 /* Check if there is enough headroom to insert fragment header. */
1325 if ((skb_headroom(skb) < frag_hdr_sz) &&
1326 pskb_expand_head(skb, frag_hdr_sz, 0, GFP_ATOMIC))
1327 goto out;
1328
1329 /* Find the unfragmentable header and shift it left by frag_hdr_sz
1330 * bytes to insert fragment header.
1331 */
1332 unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr);
1333 nexthdr = *prevhdr;
1334 *prevhdr = NEXTHDR_FRAGMENT;
1335 unfrag_len = skb_network_header(skb) - skb_mac_header(skb) +
1336 unfrag_ip6hlen;
1337 mac_start = skb_mac_header(skb);
1338 memmove(mac_start-frag_hdr_sz, mac_start, unfrag_len);
1339
1340 skb->mac_header -= frag_hdr_sz;
1341 skb->network_header -= frag_hdr_sz;
1342
1343 fptr = (struct frag_hdr *)(skb_network_header(skb) + unfrag_ip6hlen);
1344 fptr->nexthdr = nexthdr;
1345 fptr->reserved = 0;
1346 ipv6_select_ident(fptr);
1347
1348 /* Fragment the skb. ipv6 header and the remaining fields of the
1349 * fragment header are updated in ipv6_gso_segment()
1350 */
1351 segs = skb_segment(skb, features);
1352
1353 out:
1354 return segs;
1355 }
1356
1357 static const struct inet6_protocol udpv6_protocol = {
1358 .handler = udpv6_rcv,
1359 .err_handler = udpv6_err,
1360 .gso_send_check = udp6_ufo_send_check,
1361 .gso_segment = udp6_ufo_fragment,
1362 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1363 };
1364
1365 /* ------------------------------------------------------------------------ */
1366 #ifdef CONFIG_PROC_FS
1367
1368 static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket)
1369 {
1370 struct inet_sock *inet = inet_sk(sp);
1371 struct ipv6_pinfo *np = inet6_sk(sp);
1372 struct in6_addr *dest, *src;
1373 __u16 destp, srcp;
1374
1375 dest = &np->daddr;
1376 src = &np->rcv_saddr;
1377 destp = ntohs(inet->inet_dport);
1378 srcp = ntohs(inet->inet_sport);
1379 seq_printf(seq,
1380 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1381 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %d\n",
1382 bucket,
1383 src->s6_addr32[0], src->s6_addr32[1],
1384 src->s6_addr32[2], src->s6_addr32[3], srcp,
1385 dest->s6_addr32[0], dest->s6_addr32[1],
1386 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1387 sp->sk_state,
1388 sk_wmem_alloc_get(sp),
1389 sk_rmem_alloc_get(sp),
1390 0, 0L, 0,
1391 sock_i_uid(sp), 0,
1392 sock_i_ino(sp),
1393 atomic_read(&sp->sk_refcnt), sp,
1394 atomic_read(&sp->sk_drops));
1395 }
1396
1397 int udp6_seq_show(struct seq_file *seq, void *v)
1398 {
1399 if (v == SEQ_START_TOKEN)
1400 seq_printf(seq,
1401 " sl "
1402 "local_address "
1403 "remote_address "
1404 "st tx_queue rx_queue tr tm->when retrnsmt"
1405 " uid timeout inode ref pointer drops\n");
1406 else
1407 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket);
1408 return 0;
1409 }
1410
1411 static struct udp_seq_afinfo udp6_seq_afinfo = {
1412 .name = "udp6",
1413 .family = AF_INET6,
1414 .udp_table = &udp_table,
1415 .seq_fops = {
1416 .owner = THIS_MODULE,
1417 },
1418 .seq_ops = {
1419 .show = udp6_seq_show,
1420 },
1421 };
1422
1423 int __net_init udp6_proc_init(struct net *net)
1424 {
1425 return udp_proc_register(net, &udp6_seq_afinfo);
1426 }
1427
1428 void udp6_proc_exit(struct net *net) {
1429 udp_proc_unregister(net, &udp6_seq_afinfo);
1430 }
1431 #endif /* CONFIG_PROC_FS */
1432
1433 /* ------------------------------------------------------------------------ */
1434
1435 struct proto udpv6_prot = {
1436 .name = "UDPv6",
1437 .owner = THIS_MODULE,
1438 .close = udp_lib_close,
1439 .connect = ip6_datagram_connect,
1440 .disconnect = udp_disconnect,
1441 .ioctl = udp_ioctl,
1442 .destroy = udpv6_destroy_sock,
1443 .setsockopt = udpv6_setsockopt,
1444 .getsockopt = udpv6_getsockopt,
1445 .sendmsg = udpv6_sendmsg,
1446 .recvmsg = udpv6_recvmsg,
1447 .backlog_rcv = udpv6_queue_rcv_skb,
1448 .hash = udp_lib_hash,
1449 .unhash = udp_lib_unhash,
1450 .get_port = udp_v6_get_port,
1451 .memory_allocated = &udp_memory_allocated,
1452 .sysctl_mem = sysctl_udp_mem,
1453 .sysctl_wmem = &sysctl_udp_wmem_min,
1454 .sysctl_rmem = &sysctl_udp_rmem_min,
1455 .obj_size = sizeof(struct udp6_sock),
1456 .slab_flags = SLAB_DESTROY_BY_RCU,
1457 .h.udp_table = &udp_table,
1458 #ifdef CONFIG_COMPAT
1459 .compat_setsockopt = compat_udpv6_setsockopt,
1460 .compat_getsockopt = compat_udpv6_getsockopt,
1461 #endif
1462 };
1463
1464 static struct inet_protosw udpv6_protosw = {
1465 .type = SOCK_DGRAM,
1466 .protocol = IPPROTO_UDP,
1467 .prot = &udpv6_prot,
1468 .ops = &inet6_dgram_ops,
1469 .no_check = UDP_CSUM_DEFAULT,
1470 .flags = INET_PROTOSW_PERMANENT,
1471 };
1472
1473
1474 int __init udpv6_init(void)
1475 {
1476 int ret;
1477
1478 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
1479 if (ret)
1480 goto out;
1481
1482 ret = inet6_register_protosw(&udpv6_protosw);
1483 if (ret)
1484 goto out_udpv6_protocol;
1485 out:
1486 return ret;
1487
1488 out_udpv6_protocol:
1489 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1490 goto out;
1491 }
1492
1493 void udpv6_exit(void)
1494 {
1495 inet6_unregister_protosw(&udpv6_protosw);
1496 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1497 }