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can: Fix data length code handling in rx path
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / ipv6 / udp.c
blob69ebdbe78c47cb1e24657d21710b7f4b81af8ea7
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_v4mapped(addr6))
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 unsigned int hash2_nulladdr =
104 udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum);
105 unsigned int hash2_partial =
106 udp6_portaddr_hash(sock_net(sk), &inet6_sk(sk)->rcv_saddr, 0);
107
108 /* precompute partial secondary hash */
109 udp_sk(sk)->udp_portaddr_hash = hash2_partial;
110 return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal, hash2_nulladdr);
111 }
112
113 static inline int compute_score(struct sock *sk, struct net *net,
114 unsigned short hnum,
115 struct in6_addr *saddr, __be16 sport,
116 struct in6_addr *daddr, __be16 dport,
117 int dif)
118 {
119 int score = -1;
120
121 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum &&
122 sk->sk_family == PF_INET6) {
123 struct ipv6_pinfo *np = inet6_sk(sk);
124 struct inet_sock *inet = inet_sk(sk);
125
126 score = 0;
127 if (inet->inet_dport) {
128 if (inet->inet_dport != sport)
129 return -1;
130 score++;
131 }
132 if (!ipv6_addr_any(&np->rcv_saddr)) {
133 if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
134 return -1;
135 score++;
136 }
137 if (!ipv6_addr_any(&np->daddr)) {
138 if (!ipv6_addr_equal(&np->daddr, saddr))
139 return -1;
140 score++;
141 }
142 if (sk->sk_bound_dev_if) {
143 if (sk->sk_bound_dev_if != dif)
144 return -1;
145 score++;
146 }
147 }
148 return score;
149 }
150
151 #define SCORE2_MAX (1 + 1 + 1)
152 static inline int compute_score2(struct sock *sk, struct net *net,
153 const struct in6_addr *saddr, __be16 sport,
154 const struct in6_addr *daddr, unsigned short hnum,
155 int dif)
156 {
157 int score = -1;
158
159 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum &&
160 sk->sk_family == PF_INET6) {
161 struct ipv6_pinfo *np = inet6_sk(sk);
162 struct inet_sock *inet = inet_sk(sk);
163
164 if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
165 return -1;
166 score = 0;
167 if (inet->inet_dport) {
168 if (inet->inet_dport != sport)
169 return -1;
170 score++;
171 }
172 if (!ipv6_addr_any(&np->daddr)) {
173 if (!ipv6_addr_equal(&np->daddr, saddr))
174 return -1;
175 score++;
176 }
177 if (sk->sk_bound_dev_if) {
178 if (sk->sk_bound_dev_if != dif)
179 return -1;
180 score++;
181 }
182 }
183 return score;
184 }
185
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 sk = stack[i];
583 if (skb1) {
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 } else {
591 atomic_inc(&sk->sk_drops);
592 UDP6_INC_STATS_BH(sock_net(sk),
593 UDP_MIB_RCVBUFERRORS, IS_UDPLITE(sk));
594 UDP6_INC_STATS_BH(sock_net(sk),
595 UDP_MIB_INERRORS, IS_UDPLITE(sk));
596 }
597 }
598 }
599 /*
600 * Note: called only from the BH handler context,
601 * so we don't need to lock the hashes.
602 */
603 static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
604 struct in6_addr *saddr, struct in6_addr *daddr,
605 struct udp_table *udptable)
606 {
607 struct sock *sk, *stack[256 / sizeof(struct sock *)];
608 const struct udphdr *uh = udp_hdr(skb);
609 struct udp_hslot *hslot = udp_hashslot(udptable, net, ntohs(uh->dest));
610 int dif;
611 unsigned int i, count = 0;
612
613 spin_lock(&hslot->lock);
614 sk = sk_nulls_head(&hslot->head);
615 dif = inet6_iif(skb);
616 sk = udp_v6_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif);
617 while (sk) {
618 stack[count++] = sk;
619 sk = udp_v6_mcast_next(net, sk_nulls_next(sk), uh->dest, daddr,
620 uh->source, saddr, dif);
621 if (unlikely(count == ARRAY_SIZE(stack))) {
622 if (!sk)
623 break;
624 flush_stack(stack, count, skb, ~0);
625 count = 0;
626 }
627 }
628 /*
629 * before releasing the lock, we must take reference on sockets
630 */
631 for (i = 0; i < count; i++)
632 sock_hold(stack[i]);
633
634 spin_unlock(&hslot->lock);
635
636 if (count) {
637 flush_stack(stack, count, skb, count - 1);
638
639 for (i = 0; i < count; i++)
640 sock_put(stack[i]);
641 } else {
642 kfree_skb(skb);
643 }
644 return 0;
645 }
646
647 static inline int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh,
648 int proto)
649 {
650 int err;
651
652 UDP_SKB_CB(skb)->partial_cov = 0;
653 UDP_SKB_CB(skb)->cscov = skb->len;
654
655 if (proto == IPPROTO_UDPLITE) {
656 err = udplite_checksum_init(skb, uh);
657 if (err)
658 return err;
659 }
660
661 if (uh->check == 0) {
662 /* RFC 2460 section 8.1 says that we SHOULD log
663 this error. Well, it is reasonable.
664 */
665 LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n");
666 return 1;
667 }
668 if (skb->ip_summed == CHECKSUM_COMPLETE &&
669 !csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
670 skb->len, proto, skb->csum))
671 skb->ip_summed = CHECKSUM_UNNECESSARY;
672
673 if (!skb_csum_unnecessary(skb))
674 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
675 &ipv6_hdr(skb)->daddr,
676 skb->len, proto, 0));
677
678 return 0;
679 }
680
681 int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
682 int proto)
683 {
684 struct sock *sk;
685 struct udphdr *uh;
686 struct net_device *dev = skb->dev;
687 struct in6_addr *saddr, *daddr;
688 u32 ulen = 0;
689 struct net *net = dev_net(skb->dev);
690
691 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
692 goto short_packet;
693
694 saddr = &ipv6_hdr(skb)->saddr;
695 daddr = &ipv6_hdr(skb)->daddr;
696 uh = udp_hdr(skb);
697
698 ulen = ntohs(uh->len);
699 if (ulen > skb->len)
700 goto short_packet;
701
702 if (proto == IPPROTO_UDP) {
703 /* UDP validates ulen. */
704
705 /* Check for jumbo payload */
706 if (ulen == 0)
707 ulen = skb->len;
708
709 if (ulen < sizeof(*uh))
710 goto short_packet;
711
712 if (ulen < skb->len) {
713 if (pskb_trim_rcsum(skb, ulen))
714 goto short_packet;
715 saddr = &ipv6_hdr(skb)->saddr;
716 daddr = &ipv6_hdr(skb)->daddr;
717 uh = udp_hdr(skb);
718 }
719 }
720
721 if (udp6_csum_init(skb, uh, proto))
722 goto discard;
723
724 /*
725 * Multicast receive code
726 */
727 if (ipv6_addr_is_multicast(daddr))
728 return __udp6_lib_mcast_deliver(net, skb,
729 saddr, daddr, udptable);
730
731 /* Unicast */
732
733 /*
734 * check socket cache ... must talk to Alan about his plans
735 * for sock caches... i'll skip this for now.
736 */
737 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
738
739 if (sk == NULL) {
740 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
741 goto discard;
742
743 if (udp_lib_checksum_complete(skb))
744 goto discard;
745 UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS,
746 proto == IPPROTO_UDPLITE);
747
748 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev);
749
750 kfree_skb(skb);
751 return 0;
752 }
753
754 /* deliver */
755
756 bh_lock_sock(sk);
757 if (!sock_owned_by_user(sk))
758 udpv6_queue_rcv_skb(sk, skb);
759 else
760 sk_add_backlog(sk, skb);
761 bh_unlock_sock(sk);
762 sock_put(sk);
763 return 0;
764
765 short_packet:
766 LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: %d/%u\n",
767 proto == IPPROTO_UDPLITE ? "-Lite" : "",
768 ulen, skb->len);
769
770 discard:
771 UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
772 kfree_skb(skb);
773 return 0;
774 }
775
776 static __inline__ int udpv6_rcv(struct sk_buff *skb)
777 {
778 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP);
779 }
780
781 /*
782 * Throw away all pending data and cancel the corking. Socket is locked.
783 */
784 static void udp_v6_flush_pending_frames(struct sock *sk)
785 {
786 struct udp_sock *up = udp_sk(sk);
787
788 if (up->pending == AF_INET)
789 udp_flush_pending_frames(sk);
790 else if (up->pending) {
791 up->len = 0;
792 up->pending = 0;
793 ip6_flush_pending_frames(sk);
794 }
795 }
796
797 /**
798 * udp6_hwcsum_outgoing - handle outgoing HW checksumming
799 * @sk: socket we are sending on
800 * @skb: sk_buff containing the filled-in UDP header
801 * (checksum field must be zeroed out)
802 */
803 static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
804 const struct in6_addr *saddr,
805 const struct in6_addr *daddr, int len)
806 {
807 unsigned int offset;
808 struct udphdr *uh = udp_hdr(skb);
809 __wsum csum = 0;
810
811 if (skb_queue_len(&sk->sk_write_queue) == 1) {
812 /* Only one fragment on the socket. */
813 skb->csum_start = skb_transport_header(skb) - skb->head;
814 skb->csum_offset = offsetof(struct udphdr, check);
815 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0);
816 } else {
817 /*
818 * HW-checksum won't work as there are two or more
819 * fragments on the socket so that all csums of sk_buffs
820 * should be together
821 */
822 offset = skb_transport_offset(skb);
823 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
824
825 skb->ip_summed = CHECKSUM_NONE;
826
827 skb_queue_walk(&sk->sk_write_queue, skb) {
828 csum = csum_add(csum, skb->csum);
829 }
830
831 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP,
832 csum);
833 if (uh->check == 0)
834 uh->check = CSUM_MANGLED_0;
835 }
836 }
837
838 /*
839 * Sending
840 */
841
842 static int udp_v6_push_pending_frames(struct sock *sk)
843 {
844 struct sk_buff *skb;
845 struct udphdr *uh;
846 struct udp_sock *up = udp_sk(sk);
847 struct inet_sock *inet = inet_sk(sk);
848 struct flowi *fl = &inet->cork.fl;
849 int err = 0;
850 int is_udplite = IS_UDPLITE(sk);
851 __wsum csum = 0;
852
853 /* Grab the skbuff where UDP header space exists. */
854 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
855 goto out;
856
857 /*
858 * Create a UDP header
859 */
860 uh = udp_hdr(skb);
861 uh->source = fl->fl_ip_sport;
862 uh->dest = fl->fl_ip_dport;
863 uh->len = htons(up->len);
864 uh->check = 0;
865
866 if (is_udplite)
867 csum = udplite_csum_outgoing(sk, skb);
868 else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
869 udp6_hwcsum_outgoing(sk, skb, &fl->fl6_src, &fl->fl6_dst,
870 up->len);
871 goto send;
872 } else
873 csum = udp_csum_outgoing(sk, skb);
874
875 /* add protocol-dependent pseudo-header */
876 uh->check = csum_ipv6_magic(&fl->fl6_src, &fl->fl6_dst,
877 up->len, fl->proto, csum );
878 if (uh->check == 0)
879 uh->check = CSUM_MANGLED_0;
880
881 send:
882 err = ip6_push_pending_frames(sk);
883 if (err) {
884 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) {
885 UDP6_INC_STATS_USER(sock_net(sk),
886 UDP_MIB_SNDBUFERRORS, is_udplite);
887 err = 0;
888 }
889 } else
890 UDP6_INC_STATS_USER(sock_net(sk),
891 UDP_MIB_OUTDATAGRAMS, is_udplite);
892 out:
893 up->len = 0;
894 up->pending = 0;
895 return err;
896 }
897
898 int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
899 struct msghdr *msg, size_t len)
900 {
901 struct ipv6_txoptions opt_space;
902 struct udp_sock *up = udp_sk(sk);
903 struct inet_sock *inet = inet_sk(sk);
904 struct ipv6_pinfo *np = inet6_sk(sk);
905 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
906 struct in6_addr *daddr, *final_p = NULL, final;
907 struct ipv6_txoptions *opt = NULL;
908 struct ip6_flowlabel *flowlabel = NULL;
909 struct flowi fl;
910 struct dst_entry *dst;
911 int addr_len = msg->msg_namelen;
912 int ulen = len;
913 int hlimit = -1;
914 int tclass = -1;
915 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
916 int err;
917 int connected = 0;
918 int is_udplite = IS_UDPLITE(sk);
919 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
920
921 /* destination address check */
922 if (sin6) {
923 if (addr_len < offsetof(struct sockaddr, sa_data))
924 return -EINVAL;
925
926 switch (sin6->sin6_family) {
927 case AF_INET6:
928 if (addr_len < SIN6_LEN_RFC2133)
929 return -EINVAL;
930 daddr = &sin6->sin6_addr;
931 break;
932 case AF_INET:
933 goto do_udp_sendmsg;
934 case AF_UNSPEC:
935 msg->msg_name = sin6 = NULL;
936 msg->msg_namelen = addr_len = 0;
937 daddr = NULL;
938 break;
939 default:
940 return -EINVAL;
941 }
942 } else if (!up->pending) {
943 if (sk->sk_state != TCP_ESTABLISHED)
944 return -EDESTADDRREQ;
945 daddr = &np->daddr;
946 } else
947 daddr = NULL;
948
949 if (daddr) {
950 if (ipv6_addr_v4mapped(daddr)) {
951 struct sockaddr_in sin;
952 sin.sin_family = AF_INET;
953 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport;
954 sin.sin_addr.s_addr = daddr->s6_addr32[3];
955 msg->msg_name = &sin;
956 msg->msg_namelen = sizeof(sin);
957 do_udp_sendmsg:
958 if (__ipv6_only_sock(sk))
959 return -ENETUNREACH;
960 return udp_sendmsg(iocb, sk, msg, len);
961 }
962 }
963
964 if (up->pending == AF_INET)
965 return udp_sendmsg(iocb, sk, msg, len);
966
967 /* Rough check on arithmetic overflow,
968 better check is made in ip6_append_data().
969 */
970 if (len > INT_MAX - sizeof(struct udphdr))
971 return -EMSGSIZE;
972
973 if (up->pending) {
974 /*
975 * There are pending frames.
976 * The socket lock must be held while it's corked.
977 */
978 lock_sock(sk);
979 if (likely(up->pending)) {
980 if (unlikely(up->pending != AF_INET6)) {
981 release_sock(sk);
982 return -EAFNOSUPPORT;
983 }
984 dst = NULL;
985 goto do_append_data;
986 }
987 release_sock(sk);
988 }
989 ulen += sizeof(struct udphdr);
990
991 memset(&fl, 0, sizeof(fl));
992
993 if (sin6) {
994 if (sin6->sin6_port == 0)
995 return -EINVAL;
996
997 fl.fl_ip_dport = sin6->sin6_port;
998 daddr = &sin6->sin6_addr;
999
1000 if (np->sndflow) {
1001 fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
1002 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
1003 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
1004 if (flowlabel == NULL)
1005 return -EINVAL;
1006 daddr = &flowlabel->dst;
1007 }
1008 }
1009
1010 /*
1011 * Otherwise it will be difficult to maintain
1012 * sk->sk_dst_cache.
1013 */
1014 if (sk->sk_state == TCP_ESTABLISHED &&
1015 ipv6_addr_equal(daddr, &np->daddr))
1016 daddr = &np->daddr;
1017
1018 if (addr_len >= sizeof(struct sockaddr_in6) &&
1019 sin6->sin6_scope_id &&
1020 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
1021 fl.oif = sin6->sin6_scope_id;
1022 } else {
1023 if (sk->sk_state != TCP_ESTABLISHED)
1024 return -EDESTADDRREQ;
1025
1026 fl.fl_ip_dport = inet->inet_dport;
1027 daddr = &np->daddr;
1028 fl.fl6_flowlabel = np->flow_label;
1029 connected = 1;
1030 }
1031
1032 if (!fl.oif)
1033 fl.oif = sk->sk_bound_dev_if;
1034
1035 if (!fl.oif)
1036 fl.oif = np->sticky_pktinfo.ipi6_ifindex;
1037
1038 fl.mark = sk->sk_mark;
1039
1040 if (msg->msg_controllen) {
1041 opt = &opt_space;
1042 memset(opt, 0, sizeof(struct ipv6_txoptions));
1043 opt->tot_len = sizeof(*opt);
1044
1045 err = datagram_send_ctl(sock_net(sk), msg, &fl, opt, &hlimit, &tclass);
1046 if (err < 0) {
1047 fl6_sock_release(flowlabel);
1048 return err;
1049 }
1050 if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
1051 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
1052 if (flowlabel == NULL)
1053 return -EINVAL;
1054 }
1055 if (!(opt->opt_nflen|opt->opt_flen))
1056 opt = NULL;
1057 connected = 0;
1058 }
1059 if (opt == NULL)
1060 opt = np->opt;
1061 if (flowlabel)
1062 opt = fl6_merge_options(&opt_space, flowlabel, opt);
1063 opt = ipv6_fixup_options(&opt_space, opt);
1064
1065 fl.proto = sk->sk_protocol;
1066 if (!ipv6_addr_any(daddr))
1067 ipv6_addr_copy(&fl.fl6_dst, daddr);
1068 else
1069 fl.fl6_dst.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
1070 if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr))
1071 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
1072 fl.fl_ip_sport = inet->inet_sport;
1073
1074 /* merge ip6_build_xmit from ip6_output */
1075 if (opt && opt->srcrt) {
1076 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
1077 ipv6_addr_copy(&final, &fl.fl6_dst);
1078 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
1079 final_p = &final;
1080 connected = 0;
1081 }
1082
1083 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) {
1084 fl.oif = np->mcast_oif;
1085 connected = 0;
1086 }
1087
1088 security_sk_classify_flow(sk, &fl);
1089
1090 err = ip6_sk_dst_lookup(sk, &dst, &fl);
1091 if (err)
1092 goto out;
1093 if (final_p)
1094 ipv6_addr_copy(&fl.fl6_dst, final_p);
1095
1096 err = __xfrm_lookup(sock_net(sk), &dst, &fl, sk, XFRM_LOOKUP_WAIT);
1097 if (err < 0) {
1098 if (err == -EREMOTE)
1099 err = ip6_dst_blackhole(sk, &dst, &fl);
1100 if (err < 0)
1101 goto out;
1102 }
1103
1104 if (hlimit < 0) {
1105 if (ipv6_addr_is_multicast(&fl.fl6_dst))
1106 hlimit = np->mcast_hops;
1107 else
1108 hlimit = np->hop_limit;
1109 if (hlimit < 0)
1110 hlimit = ip6_dst_hoplimit(dst);
1111 }
1112
1113 if (tclass < 0)
1114 tclass = np->tclass;
1115
1116 if (msg->msg_flags&MSG_CONFIRM)
1117 goto do_confirm;
1118 back_from_confirm:
1119
1120 lock_sock(sk);
1121 if (unlikely(up->pending)) {
1122 /* The socket is already corked while preparing it. */
1123 /* ... which is an evident application bug. --ANK */
1124 release_sock(sk);
1125
1126 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
1127 err = -EINVAL;
1128 goto out;
1129 }
1130
1131 up->pending = AF_INET6;
1132
1133 do_append_data:
1134 up->len += ulen;
1135 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
1136 err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen,
1137 sizeof(struct udphdr), hlimit, tclass, opt, &fl,
1138 (struct rt6_info*)dst,
1139 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
1140 if (err)
1141 udp_v6_flush_pending_frames(sk);
1142 else if (!corkreq)
1143 err = udp_v6_push_pending_frames(sk);
1144 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
1145 up->pending = 0;
1146
1147 if (dst) {
1148 if (connected) {
1149 ip6_dst_store(sk, dst,
1150 ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ?
1151 &np->daddr : NULL,
1152 #ifdef CONFIG_IPV6_SUBTREES
1153 ipv6_addr_equal(&fl.fl6_src, &np->saddr) ?
1154 &np->saddr :
1155 #endif
1156 NULL);
1157 } else {
1158 dst_release(dst);
1159 }
1160 dst = NULL;
1161 }
1162
1163 if (err > 0)
1164 err = np->recverr ? net_xmit_errno(err) : 0;
1165 release_sock(sk);
1166 out:
1167 dst_release(dst);
1168 fl6_sock_release(flowlabel);
1169 if (!err)
1170 return len;
1171 /*
1172 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
1173 * ENOBUFS might not be good (it's not tunable per se), but otherwise
1174 * we don't have a good statistic (IpOutDiscards but it can be too many
1175 * things). We could add another new stat but at least for now that
1176 * seems like overkill.
1177 */
1178 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
1179 UDP6_INC_STATS_USER(sock_net(sk),
1180 UDP_MIB_SNDBUFERRORS, is_udplite);
1181 }
1182 return err;
1183
1184 do_confirm:
1185 dst_confirm(dst);
1186 if (!(msg->msg_flags&MSG_PROBE) || len)
1187 goto back_from_confirm;
1188 err = 0;
1189 goto out;
1190 }
1191
1192 void udpv6_destroy_sock(struct sock *sk)
1193 {
1194 lock_sock(sk);
1195 udp_v6_flush_pending_frames(sk);
1196 release_sock(sk);
1197
1198 inet6_destroy_sock(sk);
1199 }
1200
1201 /*
1202 * Socket option code for UDP
1203 */
1204 int udpv6_setsockopt(struct sock *sk, int level, int optname,
1205 char __user *optval, unsigned int optlen)
1206 {
1207 if (level == SOL_UDP || level == SOL_UDPLITE)
1208 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1209 udp_v6_push_pending_frames);
1210 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1211 }
1212
1213 #ifdef CONFIG_COMPAT
1214 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
1215 char __user *optval, unsigned int optlen)
1216 {
1217 if (level == SOL_UDP || level == SOL_UDPLITE)
1218 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1219 udp_v6_push_pending_frames);
1220 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
1221 }
1222 #endif
1223
1224 int udpv6_getsockopt(struct sock *sk, int level, int optname,
1225 char __user *optval, int __user *optlen)
1226 {
1227 if (level == SOL_UDP || level == SOL_UDPLITE)
1228 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1229 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1230 }
1231
1232 #ifdef CONFIG_COMPAT
1233 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
1234 char __user *optval, int __user *optlen)
1235 {
1236 if (level == SOL_UDP || level == SOL_UDPLITE)
1237 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1238 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
1239 }
1240 #endif
1241
1242 static int udp6_ufo_send_check(struct sk_buff *skb)
1243 {
1244 struct ipv6hdr *ipv6h;
1245 struct udphdr *uh;
1246
1247 if (!pskb_may_pull(skb, sizeof(*uh)))
1248 return -EINVAL;
1249
1250 ipv6h = ipv6_hdr(skb);
1251 uh = udp_hdr(skb);
1252
1253 uh->check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr, skb->len,
1254 IPPROTO_UDP, 0);
1255 skb->csum_start = skb_transport_header(skb) - skb->head;
1256 skb->csum_offset = offsetof(struct udphdr, check);
1257 skb->ip_summed = CHECKSUM_PARTIAL;
1258 return 0;
1259 }
1260
1261 static struct sk_buff *udp6_ufo_fragment(struct sk_buff *skb, int features)
1262 {
1263 struct sk_buff *segs = ERR_PTR(-EINVAL);
1264 unsigned int mss;
1265 unsigned int unfrag_ip6hlen, unfrag_len;
1266 struct frag_hdr *fptr;
1267 u8 *mac_start, *prevhdr;
1268 u8 nexthdr;
1269 u8 frag_hdr_sz = sizeof(struct frag_hdr);
1270 int offset;
1271 __wsum csum;
1272
1273 mss = skb_shinfo(skb)->gso_size;
1274 if (unlikely(skb->len <= mss))
1275 goto out;
1276
1277 if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) {
1278 /* Packet is from an untrusted source, reset gso_segs. */
1279 int type = skb_shinfo(skb)->gso_type;
1280
1281 if (unlikely(type & ~(SKB_GSO_UDP | SKB_GSO_DODGY) ||
1282 !(type & (SKB_GSO_UDP))))
1283 goto out;
1284
1285 skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(skb->len, mss);
1286
1287 segs = NULL;
1288 goto out;
1289 }
1290
1291 /* Do software UFO. Complete and fill in the UDP checksum as HW cannot
1292 * do checksum of UDP packets sent as multiple IP fragments.
1293 */
1294 offset = skb->csum_start - skb_headroom(skb);
1295 csum = skb_checksum(skb, offset, skb->len- offset, 0);
1296 offset += skb->csum_offset;
1297 *(__sum16 *)(skb->data + offset) = csum_fold(csum);
1298 skb->ip_summed = CHECKSUM_NONE;
1299
1300 /* Check if there is enough headroom to insert fragment header. */
1301 if ((skb_headroom(skb) < frag_hdr_sz) &&
1302 pskb_expand_head(skb, frag_hdr_sz, 0, GFP_ATOMIC))
1303 goto out;
1304
1305 /* Find the unfragmentable header and shift it left by frag_hdr_sz
1306 * bytes to insert fragment header.
1307 */
1308 unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr);
1309 nexthdr = *prevhdr;
1310 *prevhdr = NEXTHDR_FRAGMENT;
1311 unfrag_len = skb_network_header(skb) - skb_mac_header(skb) +
1312 unfrag_ip6hlen;
1313 mac_start = skb_mac_header(skb);
1314 memmove(mac_start-frag_hdr_sz, mac_start, unfrag_len);
1315
1316 skb->mac_header -= frag_hdr_sz;
1317 skb->network_header -= frag_hdr_sz;
1318
1319 fptr = (struct frag_hdr *)(skb_network_header(skb) + unfrag_ip6hlen);
1320 fptr->nexthdr = nexthdr;
1321 fptr->reserved = 0;
1322 ipv6_select_ident(fptr);
1323
1324 /* Fragment the skb. ipv6 header and the remaining fields of the
1325 * fragment header are updated in ipv6_gso_segment()
1326 */
1327 segs = skb_segment(skb, features);
1328
1329 out:
1330 return segs;
1331 }
1332
1333 static const struct inet6_protocol udpv6_protocol = {
1334 .handler = udpv6_rcv,
1335 .err_handler = udpv6_err,
1336 .gso_send_check = udp6_ufo_send_check,
1337 .gso_segment = udp6_ufo_fragment,
1338 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1339 };
1340
1341 /* ------------------------------------------------------------------------ */
1342 #ifdef CONFIG_PROC_FS
1343
1344 static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket)
1345 {
1346 struct inet_sock *inet = inet_sk(sp);
1347 struct ipv6_pinfo *np = inet6_sk(sp);
1348 struct in6_addr *dest, *src;
1349 __u16 destp, srcp;
1350
1351 dest = &np->daddr;
1352 src = &np->rcv_saddr;
1353 destp = ntohs(inet->inet_dport);
1354 srcp = ntohs(inet->inet_sport);
1355 seq_printf(seq,
1356 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1357 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %d\n",
1358 bucket,
1359 src->s6_addr32[0], src->s6_addr32[1],
1360 src->s6_addr32[2], src->s6_addr32[3], srcp,
1361 dest->s6_addr32[0], dest->s6_addr32[1],
1362 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1363 sp->sk_state,
1364 sk_wmem_alloc_get(sp),
1365 sk_rmem_alloc_get(sp),
1366 0, 0L, 0,
1367 sock_i_uid(sp), 0,
1368 sock_i_ino(sp),
1369 atomic_read(&sp->sk_refcnt), sp,
1370 atomic_read(&sp->sk_drops));
1371 }
1372
1373 int udp6_seq_show(struct seq_file *seq, void *v)
1374 {
1375 if (v == SEQ_START_TOKEN)
1376 seq_printf(seq,
1377 " sl "
1378 "local_address "
1379 "remote_address "
1380 "st tx_queue rx_queue tr tm->when retrnsmt"
1381 " uid timeout inode ref pointer drops\n");
1382 else
1383 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket);
1384 return 0;
1385 }
1386
1387 static struct udp_seq_afinfo udp6_seq_afinfo = {
1388 .name = "udp6",
1389 .family = AF_INET6,
1390 .udp_table = &udp_table,
1391 .seq_fops = {
1392 .owner = THIS_MODULE,
1393 },
1394 .seq_ops = {
1395 .show = udp6_seq_show,
1396 },
1397 };
1398
1399 int udp6_proc_init(struct net *net)
1400 {
1401 return udp_proc_register(net, &udp6_seq_afinfo);
1402 }
1403
1404 void udp6_proc_exit(struct net *net) {
1405 udp_proc_unregister(net, &udp6_seq_afinfo);
1406 }
1407 #endif /* CONFIG_PROC_FS */
1408
1409 /* ------------------------------------------------------------------------ */
1410
1411 struct proto udpv6_prot = {
1412 .name = "UDPv6",
1413 .owner = THIS_MODULE,
1414 .close = udp_lib_close,
1415 .connect = ip6_datagram_connect,
1416 .disconnect = udp_disconnect,
1417 .ioctl = udp_ioctl,
1418 .destroy = udpv6_destroy_sock,
1419 .setsockopt = udpv6_setsockopt,
1420 .getsockopt = udpv6_getsockopt,
1421 .sendmsg = udpv6_sendmsg,
1422 .recvmsg = udpv6_recvmsg,
1423 .backlog_rcv = udpv6_queue_rcv_skb,
1424 .hash = udp_lib_hash,
1425 .unhash = udp_lib_unhash,
1426 .get_port = udp_v6_get_port,
1427 .memory_allocated = &udp_memory_allocated,
1428 .sysctl_mem = sysctl_udp_mem,
1429 .sysctl_wmem = &sysctl_udp_wmem_min,
1430 .sysctl_rmem = &sysctl_udp_rmem_min,
1431 .obj_size = sizeof(struct udp6_sock),
1432 .slab_flags = SLAB_DESTROY_BY_RCU,
1433 .h.udp_table = &udp_table,
1434 #ifdef CONFIG_COMPAT
1435 .compat_setsockopt = compat_udpv6_setsockopt,
1436 .compat_getsockopt = compat_udpv6_getsockopt,
1437 #endif
1438 };
1439
1440 static struct inet_protosw udpv6_protosw = {
1441 .type = SOCK_DGRAM,
1442 .protocol = IPPROTO_UDP,
1443 .prot = &udpv6_prot,
1444 .ops = &inet6_dgram_ops,
1445 .no_check = UDP_CSUM_DEFAULT,
1446 .flags = INET_PROTOSW_PERMANENT,
1447 };
1448
1449
1450 int __init udpv6_init(void)
1451 {
1452 int ret;
1453
1454 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
1455 if (ret)
1456 goto out;
1457
1458 ret = inet6_register_protosw(&udpv6_protosw);
1459 if (ret)
1460 goto out_udpv6_protocol;
1461 out:
1462 return ret;
1463
1464 out_udpv6_protocol:
1465 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1466 goto out;
1467 }
1468
1469 void udpv6_exit(void)
1470 {
1471 inet6_unregister_protosw(&udpv6_protosw);
1472 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1473 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree