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x86, mce, AMD: Fix leaving freed data in a list
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / ipv6 / udp.c
blobe55aa9c408da360f69091d382a2692b40ae42f4c
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 void udp_v6_rehash(struct sock *sk)
114 {
115 u16 new_hash = udp6_portaddr_hash(sock_net(sk),
116 &inet6_sk(sk)->rcv_saddr,
117 inet_sk(sk)->inet_num);
118
119 udp_lib_rehash(sk, new_hash);
120 }
121
122 static inline int compute_score(struct sock *sk, struct net *net,
123 unsigned short hnum,
124 struct in6_addr *saddr, __be16 sport,
125 struct in6_addr *daddr, __be16 dport,
126 int dif)
127 {
128 int score = -1;
129
130 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum &&
131 sk->sk_family == PF_INET6) {
132 struct ipv6_pinfo *np = inet6_sk(sk);
133 struct inet_sock *inet = inet_sk(sk);
134
135 score = 0;
136 if (inet->inet_dport) {
137 if (inet->inet_dport != sport)
138 return -1;
139 score++;
140 }
141 if (!ipv6_addr_any(&np->rcv_saddr)) {
142 if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
143 return -1;
144 score++;
145 }
146 if (!ipv6_addr_any(&np->daddr)) {
147 if (!ipv6_addr_equal(&np->daddr, saddr))
148 return -1;
149 score++;
150 }
151 if (sk->sk_bound_dev_if) {
152 if (sk->sk_bound_dev_if != dif)
153 return -1;
154 score++;
155 }
156 }
157 return score;
158 }
159
160 #define SCORE2_MAX (1 + 1 + 1)
161 static inline int compute_score2(struct sock *sk, struct net *net,
162 const struct in6_addr *saddr, __be16 sport,
163 const struct in6_addr *daddr, unsigned short hnum,
164 int dif)
165 {
166 int score = -1;
167
168 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum &&
169 sk->sk_family == PF_INET6) {
170 struct ipv6_pinfo *np = inet6_sk(sk);
171 struct inet_sock *inet = inet_sk(sk);
172
173 if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
174 return -1;
175 score = 0;
176 if (inet->inet_dport) {
177 if (inet->inet_dport != sport)
178 return -1;
179 score++;
180 }
181 if (!ipv6_addr_any(&np->daddr)) {
182 if (!ipv6_addr_equal(&np->daddr, saddr))
183 return -1;
184 score++;
185 }
186 if (sk->sk_bound_dev_if) {
187 if (sk->sk_bound_dev_if != dif)
188 return -1;
189 score++;
190 }
191 }
192 return score;
193 }
194
195
196 /* called with read_rcu_lock() */
197 static struct sock *udp6_lib_lookup2(struct net *net,
198 const struct in6_addr *saddr, __be16 sport,
199 const struct in6_addr *daddr, unsigned int hnum, int dif,
200 struct udp_hslot *hslot2, unsigned int slot2)
201 {
202 struct sock *sk, *result;
203 struct hlist_nulls_node *node;
204 int score, badness;
205
206 begin:
207 result = NULL;
208 badness = -1;
209 udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) {
210 score = compute_score2(sk, net, saddr, sport,
211 daddr, hnum, dif);
212 if (score > badness) {
213 result = sk;
214 badness = score;
215 if (score == SCORE2_MAX)
216 goto exact_match;
217 }
218 }
219 /*
220 * if the nulls value we got at the end of this lookup is
221 * not the expected one, we must restart lookup.
222 * We probably met an item that was moved to another chain.
223 */
224 if (get_nulls_value(node) != slot2)
225 goto begin;
226
227 if (result) {
228 exact_match:
229 if (unlikely(!atomic_inc_not_zero(&result->sk_refcnt)))
230 result = NULL;
231 else if (unlikely(compute_score2(result, net, saddr, sport,
232 daddr, hnum, dif) < badness)) {
233 sock_put(result);
234 goto begin;
235 }
236 }
237 return result;
238 }
239
240 static struct sock *__udp6_lib_lookup(struct net *net,
241 struct in6_addr *saddr, __be16 sport,
242 struct in6_addr *daddr, __be16 dport,
243 int dif, struct udp_table *udptable)
244 {
245 struct sock *sk, *result;
246 struct hlist_nulls_node *node;
247 unsigned short hnum = ntohs(dport);
248 unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask);
249 struct udp_hslot *hslot2, *hslot = &udptable->hash[slot];
250 int score, badness;
251
252 rcu_read_lock();
253 if (hslot->count > 10) {
254 hash2 = udp6_portaddr_hash(net, daddr, hnum);
255 slot2 = hash2 & udptable->mask;
256 hslot2 = &udptable->hash2[slot2];
257 if (hslot->count < hslot2->count)
258 goto begin;
259
260 result = udp6_lib_lookup2(net, saddr, sport,
261 daddr, hnum, dif,
262 hslot2, slot2);
263 if (!result) {
264 hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum);
265 slot2 = hash2 & udptable->mask;
266 hslot2 = &udptable->hash2[slot2];
267 if (hslot->count < hslot2->count)
268 goto begin;
269
270 result = udp6_lib_lookup2(net, saddr, sport,
271 &in6addr_any, hnum, dif,
272 hslot2, slot2);
273 }
274 rcu_read_unlock();
275 return result;
276 }
277 begin:
278 result = NULL;
279 badness = -1;
280 sk_nulls_for_each_rcu(sk, node, &hslot->head) {
281 score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif);
282 if (score > badness) {
283 result = sk;
284 badness = score;
285 }
286 }
287 /*
288 * if the nulls value we got at the end of this lookup is
289 * not the expected one, we must restart lookup.
290 * We probably met an item that was moved to another chain.
291 */
292 if (get_nulls_value(node) != slot)
293 goto begin;
294
295 if (result) {
296 if (unlikely(!atomic_inc_not_zero(&result->sk_refcnt)))
297 result = NULL;
298 else if (unlikely(compute_score(result, net, hnum, saddr, sport,
299 daddr, dport, dif) < badness)) {
300 sock_put(result);
301 goto begin;
302 }
303 }
304 rcu_read_unlock();
305 return result;
306 }
307
308 static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb,
309 __be16 sport, __be16 dport,
310 struct udp_table *udptable)
311 {
312 struct sock *sk;
313 struct ipv6hdr *iph = ipv6_hdr(skb);
314
315 if (unlikely(sk = skb_steal_sock(skb)))
316 return sk;
317 return __udp6_lib_lookup(dev_net(skb_dst(skb)->dev), &iph->saddr, sport,
318 &iph->daddr, dport, inet6_iif(skb),
319 udptable);
320 }
321
322 /*
323 * This should be easy, if there is something there we
324 * return it, otherwise we block.
325 */
326
327 int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
328 struct msghdr *msg, size_t len,
329 int noblock, int flags, int *addr_len)
330 {
331 struct ipv6_pinfo *np = inet6_sk(sk);
332 struct inet_sock *inet = inet_sk(sk);
333 struct sk_buff *skb;
334 unsigned int ulen, copied;
335 int peeked;
336 int err;
337 int is_udplite = IS_UDPLITE(sk);
338 int is_udp4;
339
340 if (addr_len)
341 *addr_len=sizeof(struct sockaddr_in6);
342
343 if (flags & MSG_ERRQUEUE)
344 return ipv6_recv_error(sk, msg, len);
345
346 try_again:
347 skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),
348 &peeked, &err);
349 if (!skb)
350 goto out;
351
352 ulen = skb->len - sizeof(struct udphdr);
353 copied = len;
354 if (copied > ulen)
355 copied = ulen;
356 else if (copied < ulen)
357 msg->msg_flags |= MSG_TRUNC;
358
359 is_udp4 = (skb->protocol == htons(ETH_P_IP));
360
361 /*
362 * If checksum is needed at all, try to do it while copying the
363 * data. If the data is truncated, or if we only want a partial
364 * coverage checksum (UDP-Lite), do it before the copy.
365 */
366
367 if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) {
368 if (udp_lib_checksum_complete(skb))
369 goto csum_copy_err;
370 }
371
372 if (skb_csum_unnecessary(skb))
373 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr),
374 msg->msg_iov, copied );
375 else {
376 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
377 if (err == -EINVAL)
378 goto csum_copy_err;
379 }
380 if (err)
381 goto out_free;
382
383 if (!peeked) {
384 if (is_udp4)
385 UDP_INC_STATS_USER(sock_net(sk),
386 UDP_MIB_INDATAGRAMS, is_udplite);
387 else
388 UDP6_INC_STATS_USER(sock_net(sk),
389 UDP_MIB_INDATAGRAMS, is_udplite);
390 }
391
392 sock_recv_ts_and_drops(msg, sk, skb);
393
394 /* Copy the address. */
395 if (msg->msg_name) {
396 struct sockaddr_in6 *sin6;
397
398 sin6 = (struct sockaddr_in6 *) msg->msg_name;
399 sin6->sin6_family = AF_INET6;
400 sin6->sin6_port = udp_hdr(skb)->source;
401 sin6->sin6_flowinfo = 0;
402 sin6->sin6_scope_id = 0;
403
404 if (is_udp4)
405 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
406 &sin6->sin6_addr);
407 else {
408 ipv6_addr_copy(&sin6->sin6_addr,
409 &ipv6_hdr(skb)->saddr);
410 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
411 sin6->sin6_scope_id = IP6CB(skb)->iif;
412 }
413
414 }
415 if (is_udp4) {
416 if (inet->cmsg_flags)
417 ip_cmsg_recv(msg, skb);
418 } else {
419 if (np->rxopt.all)
420 datagram_recv_ctl(sk, msg, skb);
421 }
422
423 err = copied;
424 if (flags & MSG_TRUNC)
425 err = ulen;
426
427 out_free:
428 skb_free_datagram_locked(sk, skb);
429 out:
430 return err;
431
432 csum_copy_err:
433 lock_sock(sk);
434 if (!skb_kill_datagram(sk, skb, flags)) {
435 if (is_udp4)
436 UDP_INC_STATS_USER(sock_net(sk),
437 UDP_MIB_INERRORS, is_udplite);
438 else
439 UDP6_INC_STATS_USER(sock_net(sk),
440 UDP_MIB_INERRORS, is_udplite);
441 }
442 release_sock(sk);
443
444 if (flags & MSG_DONTWAIT)
445 return -EAGAIN;
446 goto try_again;
447 }
448
449 void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
450 u8 type, u8 code, int offset, __be32 info,
451 struct udp_table *udptable)
452 {
453 struct ipv6_pinfo *np;
454 struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data;
455 struct in6_addr *saddr = &hdr->saddr;
456 struct in6_addr *daddr = &hdr->daddr;
457 struct udphdr *uh = (struct udphdr*)(skb->data+offset);
458 struct sock *sk;
459 int err;
460
461 sk = __udp6_lib_lookup(dev_net(skb->dev), daddr, uh->dest,
462 saddr, uh->source, inet6_iif(skb), udptable);
463 if (sk == NULL)
464 return;
465
466 np = inet6_sk(sk);
467
468 if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
469 goto out;
470
471 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
472 goto out;
473
474 if (np->recverr)
475 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
476
477 sk->sk_err = err;
478 sk->sk_error_report(sk);
479 out:
480 sock_put(sk);
481 }
482
483 static __inline__ void udpv6_err(struct sk_buff *skb,
484 struct inet6_skb_parm *opt, u8 type,
485 u8 code, int offset, __be32 info )
486 {
487 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table);
488 }
489
490 int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
491 {
492 struct udp_sock *up = udp_sk(sk);
493 int rc;
494 int is_udplite = IS_UDPLITE(sk);
495
496 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
497 goto drop;
498
499 /*
500 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
501 */
502 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
503
504 if (up->pcrlen == 0) { /* full coverage was set */
505 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage"
506 " %d while full coverage %d requested\n",
507 UDP_SKB_CB(skb)->cscov, skb->len);
508 goto drop;
509 }
510 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
511 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d "
512 "too small, need min %d\n",
513 UDP_SKB_CB(skb)->cscov, up->pcrlen);
514 goto drop;
515 }
516 }
517
518 if (sk->sk_filter) {
519 if (udp_lib_checksum_complete(skb))
520 goto drop;
521 }
522
523 if ((rc = sock_queue_rcv_skb(sk, skb)) < 0) {
524 /* Note that an ENOMEM error is charged twice */
525 if (rc == -ENOMEM)
526 UDP6_INC_STATS_BH(sock_net(sk),
527 UDP_MIB_RCVBUFERRORS, is_udplite);
528 goto drop_no_sk_drops_inc;
529 }
530
531 return 0;
532 drop:
533 atomic_inc(&sk->sk_drops);
534 drop_no_sk_drops_inc:
535 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
536 kfree_skb(skb);
537 return -1;
538 }
539
540 static struct sock *udp_v6_mcast_next(struct net *net, struct sock *sk,
541 __be16 loc_port, struct in6_addr *loc_addr,
542 __be16 rmt_port, struct in6_addr *rmt_addr,
543 int dif)
544 {
545 struct hlist_nulls_node *node;
546 struct sock *s = sk;
547 unsigned short num = ntohs(loc_port);
548
549 sk_nulls_for_each_from(s, node) {
550 struct inet_sock *inet = inet_sk(s);
551
552 if (!net_eq(sock_net(s), net))
553 continue;
554
555 if (udp_sk(s)->udp_port_hash == num &&
556 s->sk_family == PF_INET6) {
557 struct ipv6_pinfo *np = inet6_sk(s);
558 if (inet->inet_dport) {
559 if (inet->inet_dport != rmt_port)
560 continue;
561 }
562 if (!ipv6_addr_any(&np->daddr) &&
563 !ipv6_addr_equal(&np->daddr, rmt_addr))
564 continue;
565
566 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)
567 continue;
568
569 if (!ipv6_addr_any(&np->rcv_saddr)) {
570 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr))
571 continue;
572 }
573 if (!inet6_mc_check(s, loc_addr, rmt_addr))
574 continue;
575 return s;
576 }
577 }
578 return NULL;
579 }
580
581 static void flush_stack(struct sock **stack, unsigned int count,
582 struct sk_buff *skb, unsigned int final)
583 {
584 unsigned int i;
585 struct sock *sk;
586 struct sk_buff *skb1;
587
588 for (i = 0; i < count; i++) {
589 skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC);
590
591 sk = stack[i];
592 if (skb1) {
593 bh_lock_sock(sk);
594 if (!sock_owned_by_user(sk))
595 udpv6_queue_rcv_skb(sk, skb1);
596 else if (sk_add_backlog(sk, skb1)) {
597 kfree_skb(skb1);
598 bh_unlock_sock(sk);
599 goto drop;
600 }
601 bh_unlock_sock(sk);
602 continue;
603 }
604 drop:
605 atomic_inc(&sk->sk_drops);
606 UDP6_INC_STATS_BH(sock_net(sk),
607 UDP_MIB_RCVBUFERRORS, IS_UDPLITE(sk));
608 UDP6_INC_STATS_BH(sock_net(sk),
609 UDP_MIB_INERRORS, IS_UDPLITE(sk));
610 }
611 }
612 /*
613 * Note: called only from the BH handler context,
614 * so we don't need to lock the hashes.
615 */
616 static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
617 struct in6_addr *saddr, struct in6_addr *daddr,
618 struct udp_table *udptable)
619 {
620 struct sock *sk, *stack[256 / sizeof(struct sock *)];
621 const struct udphdr *uh = udp_hdr(skb);
622 struct udp_hslot *hslot = udp_hashslot(udptable, net, ntohs(uh->dest));
623 int dif;
624 unsigned int i, count = 0;
625
626 spin_lock(&hslot->lock);
627 sk = sk_nulls_head(&hslot->head);
628 dif = inet6_iif(skb);
629 sk = udp_v6_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif);
630 while (sk) {
631 stack[count++] = sk;
632 sk = udp_v6_mcast_next(net, sk_nulls_next(sk), uh->dest, daddr,
633 uh->source, saddr, dif);
634 if (unlikely(count == ARRAY_SIZE(stack))) {
635 if (!sk)
636 break;
637 flush_stack(stack, count, skb, ~0);
638 count = 0;
639 }
640 }
641 /*
642 * before releasing the lock, we must take reference on sockets
643 */
644 for (i = 0; i < count; i++)
645 sock_hold(stack[i]);
646
647 spin_unlock(&hslot->lock);
648
649 if (count) {
650 flush_stack(stack, count, skb, count - 1);
651
652 for (i = 0; i < count; i++)
653 sock_put(stack[i]);
654 } else {
655 kfree_skb(skb);
656 }
657 return 0;
658 }
659
660 static inline int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh,
661 int proto)
662 {
663 int err;
664
665 UDP_SKB_CB(skb)->partial_cov = 0;
666 UDP_SKB_CB(skb)->cscov = skb->len;
667
668 if (proto == IPPROTO_UDPLITE) {
669 err = udplite_checksum_init(skb, uh);
670 if (err)
671 return err;
672 }
673
674 if (uh->check == 0) {
675 /* RFC 2460 section 8.1 says that we SHOULD log
676 this error. Well, it is reasonable.
677 */
678 LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n");
679 return 1;
680 }
681 if (skb->ip_summed == CHECKSUM_COMPLETE &&
682 !csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
683 skb->len, proto, skb->csum))
684 skb->ip_summed = CHECKSUM_UNNECESSARY;
685
686 if (!skb_csum_unnecessary(skb))
687 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
688 &ipv6_hdr(skb)->daddr,
689 skb->len, proto, 0));
690
691 return 0;
692 }
693
694 int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
695 int proto)
696 {
697 struct sock *sk;
698 struct udphdr *uh;
699 struct net_device *dev = skb->dev;
700 struct in6_addr *saddr, *daddr;
701 u32 ulen = 0;
702 struct net *net = dev_net(skb->dev);
703
704 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
705 goto short_packet;
706
707 saddr = &ipv6_hdr(skb)->saddr;
708 daddr = &ipv6_hdr(skb)->daddr;
709 uh = udp_hdr(skb);
710
711 ulen = ntohs(uh->len);
712 if (ulen > skb->len)
713 goto short_packet;
714
715 if (proto == IPPROTO_UDP) {
716 /* UDP validates ulen. */
717
718 /* Check for jumbo payload */
719 if (ulen == 0)
720 ulen = skb->len;
721
722 if (ulen < sizeof(*uh))
723 goto short_packet;
724
725 if (ulen < skb->len) {
726 if (pskb_trim_rcsum(skb, ulen))
727 goto short_packet;
728 saddr = &ipv6_hdr(skb)->saddr;
729 daddr = &ipv6_hdr(skb)->daddr;
730 uh = udp_hdr(skb);
731 }
732 }
733
734 if (udp6_csum_init(skb, uh, proto))
735 goto discard;
736
737 /*
738 * Multicast receive code
739 */
740 if (ipv6_addr_is_multicast(daddr))
741 return __udp6_lib_mcast_deliver(net, skb,
742 saddr, daddr, udptable);
743
744 /* Unicast */
745
746 /*
747 * check socket cache ... must talk to Alan about his plans
748 * for sock caches... i'll skip this for now.
749 */
750 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
751
752 if (sk == NULL) {
753 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
754 goto discard;
755
756 if (udp_lib_checksum_complete(skb))
757 goto discard;
758 UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS,
759 proto == IPPROTO_UDPLITE);
760
761 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev);
762
763 kfree_skb(skb);
764 return 0;
765 }
766
767 /* deliver */
768
769 bh_lock_sock(sk);
770 if (!sock_owned_by_user(sk))
771 udpv6_queue_rcv_skb(sk, skb);
772 else if (sk_add_backlog(sk, skb)) {
773 atomic_inc(&sk->sk_drops);
774 bh_unlock_sock(sk);
775 sock_put(sk);
776 goto discard;
777 }
778 bh_unlock_sock(sk);
779 sock_put(sk);
780 return 0;
781
782 short_packet:
783 LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: %d/%u\n",
784 proto == IPPROTO_UDPLITE ? "-Lite" : "",
785 ulen, skb->len);
786
787 discard:
788 UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
789 kfree_skb(skb);
790 return 0;
791 }
792
793 static __inline__ int udpv6_rcv(struct sk_buff *skb)
794 {
795 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP);
796 }
797
798 /*
799 * Throw away all pending data and cancel the corking. Socket is locked.
800 */
801 static void udp_v6_flush_pending_frames(struct sock *sk)
802 {
803 struct udp_sock *up = udp_sk(sk);
804
805 if (up->pending == AF_INET)
806 udp_flush_pending_frames(sk);
807 else if (up->pending) {
808 up->len = 0;
809 up->pending = 0;
810 ip6_flush_pending_frames(sk);
811 }
812 }
813
814 /**
815 * udp6_hwcsum_outgoing - handle outgoing HW checksumming
816 * @sk: socket we are sending on
817 * @skb: sk_buff containing the filled-in UDP header
818 * (checksum field must be zeroed out)
819 */
820 static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
821 const struct in6_addr *saddr,
822 const struct in6_addr *daddr, int len)
823 {
824 unsigned int offset;
825 struct udphdr *uh = udp_hdr(skb);
826 __wsum csum = 0;
827
828 if (skb_queue_len(&sk->sk_write_queue) == 1) {
829 /* Only one fragment on the socket. */
830 skb->csum_start = skb_transport_header(skb) - skb->head;
831 skb->csum_offset = offsetof(struct udphdr, check);
832 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0);
833 } else {
834 /*
835 * HW-checksum won't work as there are two or more
836 * fragments on the socket so that all csums of sk_buffs
837 * should be together
838 */
839 offset = skb_transport_offset(skb);
840 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
841
842 skb->ip_summed = CHECKSUM_NONE;
843
844 skb_queue_walk(&sk->sk_write_queue, skb) {
845 csum = csum_add(csum, skb->csum);
846 }
847
848 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP,
849 csum);
850 if (uh->check == 0)
851 uh->check = CSUM_MANGLED_0;
852 }
853 }
854
855 /*
856 * Sending
857 */
858
859 static int udp_v6_push_pending_frames(struct sock *sk)
860 {
861 struct sk_buff *skb;
862 struct udphdr *uh;
863 struct udp_sock *up = udp_sk(sk);
864 struct inet_sock *inet = inet_sk(sk);
865 struct flowi *fl = &inet->cork.fl;
866 int err = 0;
867 int is_udplite = IS_UDPLITE(sk);
868 __wsum csum = 0;
869
870 /* Grab the skbuff where UDP header space exists. */
871 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
872 goto out;
873
874 /*
875 * Create a UDP header
876 */
877 uh = udp_hdr(skb);
878 uh->source = fl->fl_ip_sport;
879 uh->dest = fl->fl_ip_dport;
880 uh->len = htons(up->len);
881 uh->check = 0;
882
883 if (is_udplite)
884 csum = udplite_csum_outgoing(sk, skb);
885 else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
886 udp6_hwcsum_outgoing(sk, skb, &fl->fl6_src, &fl->fl6_dst,
887 up->len);
888 goto send;
889 } else
890 csum = udp_csum_outgoing(sk, skb);
891
892 /* add protocol-dependent pseudo-header */
893 uh->check = csum_ipv6_magic(&fl->fl6_src, &fl->fl6_dst,
894 up->len, fl->proto, csum );
895 if (uh->check == 0)
896 uh->check = CSUM_MANGLED_0;
897
898 send:
899 err = ip6_push_pending_frames(sk);
900 if (err) {
901 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) {
902 UDP6_INC_STATS_USER(sock_net(sk),
903 UDP_MIB_SNDBUFERRORS, is_udplite);
904 err = 0;
905 }
906 } else
907 UDP6_INC_STATS_USER(sock_net(sk),
908 UDP_MIB_OUTDATAGRAMS, is_udplite);
909 out:
910 up->len = 0;
911 up->pending = 0;
912 return err;
913 }
914
915 int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
916 struct msghdr *msg, size_t len)
917 {
918 struct ipv6_txoptions opt_space;
919 struct udp_sock *up = udp_sk(sk);
920 struct inet_sock *inet = inet_sk(sk);
921 struct ipv6_pinfo *np = inet6_sk(sk);
922 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
923 struct in6_addr *daddr, *final_p = NULL, final;
924 struct ipv6_txoptions *opt = NULL;
925 struct ip6_flowlabel *flowlabel = NULL;
926 struct flowi fl;
927 struct dst_entry *dst;
928 int addr_len = msg->msg_namelen;
929 int ulen = len;
930 int hlimit = -1;
931 int tclass = -1;
932 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
933 int err;
934 int connected = 0;
935 int is_udplite = IS_UDPLITE(sk);
936 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
937
938 /* destination address check */
939 if (sin6) {
940 if (addr_len < offsetof(struct sockaddr, sa_data))
941 return -EINVAL;
942
943 switch (sin6->sin6_family) {
944 case AF_INET6:
945 if (addr_len < SIN6_LEN_RFC2133)
946 return -EINVAL;
947 daddr = &sin6->sin6_addr;
948 break;
949 case AF_INET:
950 goto do_udp_sendmsg;
951 case AF_UNSPEC:
952 msg->msg_name = sin6 = NULL;
953 msg->msg_namelen = addr_len = 0;
954 daddr = NULL;
955 break;
956 default:
957 return -EINVAL;
958 }
959 } else if (!up->pending) {
960 if (sk->sk_state != TCP_ESTABLISHED)
961 return -EDESTADDRREQ;
962 daddr = &np->daddr;
963 } else
964 daddr = NULL;
965
966 if (daddr) {
967 if (ipv6_addr_v4mapped(daddr)) {
968 struct sockaddr_in sin;
969 sin.sin_family = AF_INET;
970 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport;
971 sin.sin_addr.s_addr = daddr->s6_addr32[3];
972 msg->msg_name = &sin;
973 msg->msg_namelen = sizeof(sin);
974 do_udp_sendmsg:
975 if (__ipv6_only_sock(sk))
976 return -ENETUNREACH;
977 return udp_sendmsg(iocb, sk, msg, len);
978 }
979 }
980
981 if (up->pending == AF_INET)
982 return udp_sendmsg(iocb, sk, msg, len);
983
984 /* Rough check on arithmetic overflow,
985 better check is made in ip6_append_data().
986 */
987 if (len > INT_MAX - sizeof(struct udphdr))
988 return -EMSGSIZE;
989
990 if (up->pending) {
991 /*
992 * There are pending frames.
993 * The socket lock must be held while it's corked.
994 */
995 lock_sock(sk);
996 if (likely(up->pending)) {
997 if (unlikely(up->pending != AF_INET6)) {
998 release_sock(sk);
999 return -EAFNOSUPPORT;
1000 }
1001 dst = NULL;
1002 goto do_append_data;
1003 }
1004 release_sock(sk);
1005 }
1006 ulen += sizeof(struct udphdr);
1007
1008 memset(&fl, 0, sizeof(fl));
1009
1010 if (sin6) {
1011 if (sin6->sin6_port == 0)
1012 return -EINVAL;
1013
1014 fl.fl_ip_dport = sin6->sin6_port;
1015 daddr = &sin6->sin6_addr;
1016
1017 if (np->sndflow) {
1018 fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
1019 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
1020 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
1021 if (flowlabel == NULL)
1022 return -EINVAL;
1023 daddr = &flowlabel->dst;
1024 }
1025 }
1026
1027 /*
1028 * Otherwise it will be difficult to maintain
1029 * sk->sk_dst_cache.
1030 */
1031 if (sk->sk_state == TCP_ESTABLISHED &&
1032 ipv6_addr_equal(daddr, &np->daddr))
1033 daddr = &np->daddr;
1034
1035 if (addr_len >= sizeof(struct sockaddr_in6) &&
1036 sin6->sin6_scope_id &&
1037 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
1038 fl.oif = sin6->sin6_scope_id;
1039 } else {
1040 if (sk->sk_state != TCP_ESTABLISHED)
1041 return -EDESTADDRREQ;
1042
1043 fl.fl_ip_dport = inet->inet_dport;
1044 daddr = &np->daddr;
1045 fl.fl6_flowlabel = np->flow_label;
1046 connected = 1;
1047 }
1048
1049 if (!fl.oif)
1050 fl.oif = sk->sk_bound_dev_if;
1051
1052 if (!fl.oif)
1053 fl.oif = np->sticky_pktinfo.ipi6_ifindex;
1054
1055 fl.mark = sk->sk_mark;
1056
1057 if (msg->msg_controllen) {
1058 opt = &opt_space;
1059 memset(opt, 0, sizeof(struct ipv6_txoptions));
1060 opt->tot_len = sizeof(*opt);
1061
1062 err = datagram_send_ctl(sock_net(sk), msg, &fl, opt, &hlimit, &tclass);
1063 if (err < 0) {
1064 fl6_sock_release(flowlabel);
1065 return err;
1066 }
1067 if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
1068 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
1069 if (flowlabel == NULL)
1070 return -EINVAL;
1071 }
1072 if (!(opt->opt_nflen|opt->opt_flen))
1073 opt = NULL;
1074 connected = 0;
1075 }
1076 if (opt == NULL)
1077 opt = np->opt;
1078 if (flowlabel)
1079 opt = fl6_merge_options(&opt_space, flowlabel, opt);
1080 opt = ipv6_fixup_options(&opt_space, opt);
1081
1082 fl.proto = sk->sk_protocol;
1083 if (!ipv6_addr_any(daddr))
1084 ipv6_addr_copy(&fl.fl6_dst, daddr);
1085 else
1086 fl.fl6_dst.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
1087 if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr))
1088 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
1089 fl.fl_ip_sport = inet->inet_sport;
1090
1091 /* merge ip6_build_xmit from ip6_output */
1092 if (opt && opt->srcrt) {
1093 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
1094 ipv6_addr_copy(&final, &fl.fl6_dst);
1095 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
1096 final_p = &final;
1097 connected = 0;
1098 }
1099
1100 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) {
1101 fl.oif = np->mcast_oif;
1102 connected = 0;
1103 }
1104
1105 security_sk_classify_flow(sk, &fl);
1106
1107 err = ip6_sk_dst_lookup(sk, &dst, &fl);
1108 if (err)
1109 goto out;
1110 if (final_p)
1111 ipv6_addr_copy(&fl.fl6_dst, final_p);
1112
1113 err = __xfrm_lookup(sock_net(sk), &dst, &fl, sk, XFRM_LOOKUP_WAIT);
1114 if (err < 0) {
1115 if (err == -EREMOTE)
1116 err = ip6_dst_blackhole(sk, &dst, &fl);
1117 if (err < 0)
1118 goto out;
1119 }
1120
1121 if (hlimit < 0) {
1122 if (ipv6_addr_is_multicast(&fl.fl6_dst))
1123 hlimit = np->mcast_hops;
1124 else
1125 hlimit = np->hop_limit;
1126 if (hlimit < 0)
1127 hlimit = ip6_dst_hoplimit(dst);
1128 }
1129
1130 if (tclass < 0)
1131 tclass = np->tclass;
1132
1133 if (msg->msg_flags&MSG_CONFIRM)
1134 goto do_confirm;
1135 back_from_confirm:
1136
1137 lock_sock(sk);
1138 if (unlikely(up->pending)) {
1139 /* The socket is already corked while preparing it. */
1140 /* ... which is an evident application bug. --ANK */
1141 release_sock(sk);
1142
1143 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
1144 err = -EINVAL;
1145 goto out;
1146 }
1147
1148 up->pending = AF_INET6;
1149
1150 do_append_data:
1151 up->len += ulen;
1152 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
1153 err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen,
1154 sizeof(struct udphdr), hlimit, tclass, opt, &fl,
1155 (struct rt6_info*)dst,
1156 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
1157 if (err)
1158 udp_v6_flush_pending_frames(sk);
1159 else if (!corkreq)
1160 err = udp_v6_push_pending_frames(sk);
1161 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
1162 up->pending = 0;
1163
1164 if (dst) {
1165 if (connected) {
1166 ip6_dst_store(sk, dst,
1167 ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ?
1168 &np->daddr : NULL,
1169 #ifdef CONFIG_IPV6_SUBTREES
1170 ipv6_addr_equal(&fl.fl6_src, &np->saddr) ?
1171 &np->saddr :
1172 #endif
1173 NULL);
1174 } else {
1175 dst_release(dst);
1176 }
1177 dst = NULL;
1178 }
1179
1180 if (err > 0)
1181 err = np->recverr ? net_xmit_errno(err) : 0;
1182 release_sock(sk);
1183 out:
1184 dst_release(dst);
1185 fl6_sock_release(flowlabel);
1186 if (!err)
1187 return len;
1188 /*
1189 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
1190 * ENOBUFS might not be good (it's not tunable per se), but otherwise
1191 * we don't have a good statistic (IpOutDiscards but it can be too many
1192 * things). We could add another new stat but at least for now that
1193 * seems like overkill.
1194 */
1195 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
1196 UDP6_INC_STATS_USER(sock_net(sk),
1197 UDP_MIB_SNDBUFERRORS, is_udplite);
1198 }
1199 return err;
1200
1201 do_confirm:
1202 dst_confirm(dst);
1203 if (!(msg->msg_flags&MSG_PROBE) || len)
1204 goto back_from_confirm;
1205 err = 0;
1206 goto out;
1207 }
1208
1209 void udpv6_destroy_sock(struct sock *sk)
1210 {
1211 lock_sock(sk);
1212 udp_v6_flush_pending_frames(sk);
1213 release_sock(sk);
1214
1215 inet6_destroy_sock(sk);
1216 }
1217
1218 /*
1219 * Socket option code for UDP
1220 */
1221 int udpv6_setsockopt(struct sock *sk, int level, int optname,
1222 char __user *optval, unsigned int optlen)
1223 {
1224 if (level == SOL_UDP || level == SOL_UDPLITE)
1225 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1226 udp_v6_push_pending_frames);
1227 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1228 }
1229
1230 #ifdef CONFIG_COMPAT
1231 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
1232 char __user *optval, unsigned int optlen)
1233 {
1234 if (level == SOL_UDP || level == SOL_UDPLITE)
1235 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1236 udp_v6_push_pending_frames);
1237 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
1238 }
1239 #endif
1240
1241 int udpv6_getsockopt(struct sock *sk, int level, int optname,
1242 char __user *optval, int __user *optlen)
1243 {
1244 if (level == SOL_UDP || level == SOL_UDPLITE)
1245 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1246 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1247 }
1248
1249 #ifdef CONFIG_COMPAT
1250 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
1251 char __user *optval, int __user *optlen)
1252 {
1253 if (level == SOL_UDP || level == SOL_UDPLITE)
1254 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1255 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
1256 }
1257 #endif
1258
1259 static int udp6_ufo_send_check(struct sk_buff *skb)
1260 {
1261 struct ipv6hdr *ipv6h;
1262 struct udphdr *uh;
1263
1264 if (!pskb_may_pull(skb, sizeof(*uh)))
1265 return -EINVAL;
1266
1267 ipv6h = ipv6_hdr(skb);
1268 uh = udp_hdr(skb);
1269
1270 uh->check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr, skb->len,
1271 IPPROTO_UDP, 0);
1272 skb->csum_start = skb_transport_header(skb) - skb->head;
1273 skb->csum_offset = offsetof(struct udphdr, check);
1274 skb->ip_summed = CHECKSUM_PARTIAL;
1275 return 0;
1276 }
1277
1278 static struct sk_buff *udp6_ufo_fragment(struct sk_buff *skb, int features)
1279 {
1280 struct sk_buff *segs = ERR_PTR(-EINVAL);
1281 unsigned int mss;
1282 unsigned int unfrag_ip6hlen, unfrag_len;
1283 struct frag_hdr *fptr;
1284 u8 *mac_start, *prevhdr;
1285 u8 nexthdr;
1286 u8 frag_hdr_sz = sizeof(struct frag_hdr);
1287 int offset;
1288 __wsum csum;
1289
1290 mss = skb_shinfo(skb)->gso_size;
1291 if (unlikely(skb->len <= mss))
1292 goto out;
1293
1294 if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) {
1295 /* Packet is from an untrusted source, reset gso_segs. */
1296 int type = skb_shinfo(skb)->gso_type;
1297
1298 if (unlikely(type & ~(SKB_GSO_UDP | SKB_GSO_DODGY) ||
1299 !(type & (SKB_GSO_UDP))))
1300 goto out;
1301
1302 skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(skb->len, mss);
1303
1304 segs = NULL;
1305 goto out;
1306 }
1307
1308 /* Do software UFO. Complete and fill in the UDP checksum as HW cannot
1309 * do checksum of UDP packets sent as multiple IP fragments.
1310 */
1311 offset = skb->csum_start - skb_headroom(skb);
1312 csum = skb_checksum(skb, offset, skb->len- offset, 0);
1313 offset += skb->csum_offset;
1314 *(__sum16 *)(skb->data + offset) = csum_fold(csum);
1315 skb->ip_summed = CHECKSUM_NONE;
1316
1317 /* Check if there is enough headroom to insert fragment header. */
1318 if ((skb_headroom(skb) < frag_hdr_sz) &&
1319 pskb_expand_head(skb, frag_hdr_sz, 0, GFP_ATOMIC))
1320 goto out;
1321
1322 /* Find the unfragmentable header and shift it left by frag_hdr_sz
1323 * bytes to insert fragment header.
1324 */
1325 unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr);
1326 nexthdr = *prevhdr;
1327 *prevhdr = NEXTHDR_FRAGMENT;
1328 unfrag_len = skb_network_header(skb) - skb_mac_header(skb) +
1329 unfrag_ip6hlen;
1330 mac_start = skb_mac_header(skb);
1331 memmove(mac_start-frag_hdr_sz, mac_start, unfrag_len);
1332
1333 skb->mac_header -= frag_hdr_sz;
1334 skb->network_header -= frag_hdr_sz;
1335
1336 fptr = (struct frag_hdr *)(skb_network_header(skb) + unfrag_ip6hlen);
1337 fptr->nexthdr = nexthdr;
1338 fptr->reserved = 0;
1339 ipv6_select_ident(fptr);
1340
1341 /* Fragment the skb. ipv6 header and the remaining fields of the
1342 * fragment header are updated in ipv6_gso_segment()
1343 */
1344 segs = skb_segment(skb, features);
1345
1346 out:
1347 return segs;
1348 }
1349
1350 static const struct inet6_protocol udpv6_protocol = {
1351 .handler = udpv6_rcv,
1352 .err_handler = udpv6_err,
1353 .gso_send_check = udp6_ufo_send_check,
1354 .gso_segment = udp6_ufo_fragment,
1355 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1356 };
1357
1358 /* ------------------------------------------------------------------------ */
1359 #ifdef CONFIG_PROC_FS
1360
1361 static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket)
1362 {
1363 struct inet_sock *inet = inet_sk(sp);
1364 struct ipv6_pinfo *np = inet6_sk(sp);
1365 struct in6_addr *dest, *src;
1366 __u16 destp, srcp;
1367
1368 dest = &np->daddr;
1369 src = &np->rcv_saddr;
1370 destp = ntohs(inet->inet_dport);
1371 srcp = ntohs(inet->inet_sport);
1372 seq_printf(seq,
1373 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1374 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %d\n",
1375 bucket,
1376 src->s6_addr32[0], src->s6_addr32[1],
1377 src->s6_addr32[2], src->s6_addr32[3], srcp,
1378 dest->s6_addr32[0], dest->s6_addr32[1],
1379 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1380 sp->sk_state,
1381 sk_wmem_alloc_get(sp),
1382 sk_rmem_alloc_get(sp),
1383 0, 0L, 0,
1384 sock_i_uid(sp), 0,
1385 sock_i_ino(sp),
1386 atomic_read(&sp->sk_refcnt), sp,
1387 atomic_read(&sp->sk_drops));
1388 }
1389
1390 int udp6_seq_show(struct seq_file *seq, void *v)
1391 {
1392 if (v == SEQ_START_TOKEN)
1393 seq_printf(seq,
1394 " sl "
1395 "local_address "
1396 "remote_address "
1397 "st tx_queue rx_queue tr tm->when retrnsmt"
1398 " uid timeout inode ref pointer drops\n");
1399 else
1400 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket);
1401 return 0;
1402 }
1403
1404 static struct udp_seq_afinfo udp6_seq_afinfo = {
1405 .name = "udp6",
1406 .family = AF_INET6,
1407 .udp_table = &udp_table,
1408 .seq_fops = {
1409 .owner = THIS_MODULE,
1410 },
1411 .seq_ops = {
1412 .show = udp6_seq_show,
1413 },
1414 };
1415
1416 int udp6_proc_init(struct net *net)
1417 {
1418 return udp_proc_register(net, &udp6_seq_afinfo);
1419 }
1420
1421 void udp6_proc_exit(struct net *net) {
1422 udp_proc_unregister(net, &udp6_seq_afinfo);
1423 }
1424 #endif /* CONFIG_PROC_FS */
1425
1426 /* ------------------------------------------------------------------------ */
1427
1428 struct proto udpv6_prot = {
1429 .name = "UDPv6",
1430 .owner = THIS_MODULE,
1431 .close = udp_lib_close,
1432 .connect = ip6_datagram_connect,
1433 .disconnect = udp_disconnect,
1434 .ioctl = udp_ioctl,
1435 .destroy = udpv6_destroy_sock,
1436 .setsockopt = udpv6_setsockopt,
1437 .getsockopt = udpv6_getsockopt,
1438 .sendmsg = udpv6_sendmsg,
1439 .recvmsg = udpv6_recvmsg,
1440 .backlog_rcv = udpv6_queue_rcv_skb,
1441 .hash = udp_lib_hash,
1442 .unhash = udp_lib_unhash,
1443 .rehash = udp_v6_rehash,
1444 .get_port = udp_v6_get_port,
1445 .memory_allocated = &udp_memory_allocated,
1446 .sysctl_mem = sysctl_udp_mem,
1447 .sysctl_wmem = &sysctl_udp_wmem_min,
1448 .sysctl_rmem = &sysctl_udp_rmem_min,
1449 .obj_size = sizeof(struct udp6_sock),
1450 .slab_flags = SLAB_DESTROY_BY_RCU,
1451 .h.udp_table = &udp_table,
1452 #ifdef CONFIG_COMPAT
1453 .compat_setsockopt = compat_udpv6_setsockopt,
1454 .compat_getsockopt = compat_udpv6_getsockopt,
1455 #endif
1456 };
1457
1458 static struct inet_protosw udpv6_protosw = {
1459 .type = SOCK_DGRAM,
1460 .protocol = IPPROTO_UDP,
1461 .prot = &udpv6_prot,
1462 .ops = &inet6_dgram_ops,
1463 .no_check = UDP_CSUM_DEFAULT,
1464 .flags = INET_PROTOSW_PERMANENT,
1465 };
1466
1467
1468 int __init udpv6_init(void)
1469 {
1470 int ret;
1471
1472 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
1473 if (ret)
1474 goto out;
1475
1476 ret = inet6_register_protosw(&udpv6_protosw);
1477 if (ret)
1478 goto out_udpv6_protocol;
1479 out:
1480 return ret;
1481
1482 out_udpv6_protocol:
1483 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1484 goto out;
1485 }
1486
1487 void udpv6_exit(void)
1488 {
1489 inet6_unregister_protosw(&udpv6_protosw);
1490 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1491 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree