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Merge remote branch 'kumar/merge' into next
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / ipv6 / udp.c
blob5acb3560ff15267021266f59c7b2102f633f3d6a
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 void udp_v6_rehash(struct sock *sk)
115 {
116 u16 new_hash = udp6_portaddr_hash(sock_net(sk),
117 &inet6_sk(sk)->rcv_saddr,
118 inet_sk(sk)->inet_num);
119
120 udp_lib_rehash(sk, new_hash);
121 }
122
123 static inline int compute_score(struct sock *sk, struct net *net,
124 unsigned short hnum,
125 struct in6_addr *saddr, __be16 sport,
126 struct in6_addr *daddr, __be16 dport,
127 int dif)
128 {
129 int score = -1;
130
131 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum &&
132 sk->sk_family == PF_INET6) {
133 struct ipv6_pinfo *np = inet6_sk(sk);
134 struct inet_sock *inet = inet_sk(sk);
135
136 score = 0;
137 if (inet->inet_dport) {
138 if (inet->inet_dport != sport)
139 return -1;
140 score++;
141 }
142 if (!ipv6_addr_any(&np->rcv_saddr)) {
143 if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
144 return -1;
145 score++;
146 }
147 if (!ipv6_addr_any(&np->daddr)) {
148 if (!ipv6_addr_equal(&np->daddr, saddr))
149 return -1;
150 score++;
151 }
152 if (sk->sk_bound_dev_if) {
153 if (sk->sk_bound_dev_if != dif)
154 return -1;
155 score++;
156 }
157 }
158 return score;
159 }
160
161 #define SCORE2_MAX (1 + 1 + 1)
162 static inline int compute_score2(struct sock *sk, struct net *net,
163 const struct in6_addr *saddr, __be16 sport,
164 const struct in6_addr *daddr, unsigned short hnum,
165 int dif)
166 {
167 int score = -1;
168
169 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum &&
170 sk->sk_family == PF_INET6) {
171 struct ipv6_pinfo *np = inet6_sk(sk);
172 struct inet_sock *inet = inet_sk(sk);
173
174 if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
175 return -1;
176 score = 0;
177 if (inet->inet_dport) {
178 if (inet->inet_dport != sport)
179 return -1;
180 score++;
181 }
182 if (!ipv6_addr_any(&np->daddr)) {
183 if (!ipv6_addr_equal(&np->daddr, saddr))
184 return -1;
185 score++;
186 }
187 if (sk->sk_bound_dev_if) {
188 if (sk->sk_bound_dev_if != dif)
189 return -1;
190 score++;
191 }
192 }
193 return score;
194 }
195
196
197 /* called with read_rcu_lock() */
198 static struct sock *udp6_lib_lookup2(struct net *net,
199 const struct in6_addr *saddr, __be16 sport,
200 const struct in6_addr *daddr, unsigned int hnum, int dif,
201 struct udp_hslot *hslot2, unsigned int slot2)
202 {
203 struct sock *sk, *result;
204 struct hlist_nulls_node *node;
205 int score, badness;
206
207 begin:
208 result = NULL;
209 badness = -1;
210 udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) {
211 score = compute_score2(sk, net, saddr, sport,
212 daddr, hnum, dif);
213 if (score > badness) {
214 result = sk;
215 badness = score;
216 if (score == SCORE2_MAX)
217 goto exact_match;
218 }
219 }
220 /*
221 * if the nulls value we got at the end of this lookup is
222 * not the expected one, we must restart lookup.
223 * We probably met an item that was moved to another chain.
224 */
225 if (get_nulls_value(node) != slot2)
226 goto begin;
227
228 if (result) {
229 exact_match:
230 if (unlikely(!atomic_inc_not_zero(&result->sk_refcnt)))
231 result = NULL;
232 else if (unlikely(compute_score2(result, net, saddr, sport,
233 daddr, hnum, dif) < badness)) {
234 sock_put(result);
235 goto begin;
236 }
237 }
238 return result;
239 }
240
241 static struct sock *__udp6_lib_lookup(struct net *net,
242 struct in6_addr *saddr, __be16 sport,
243 struct in6_addr *daddr, __be16 dport,
244 int dif, struct udp_table *udptable)
245 {
246 struct sock *sk, *result;
247 struct hlist_nulls_node *node;
248 unsigned short hnum = ntohs(dport);
249 unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask);
250 struct udp_hslot *hslot2, *hslot = &udptable->hash[slot];
251 int score, badness;
252
253 rcu_read_lock();
254 if (hslot->count > 10) {
255 hash2 = udp6_portaddr_hash(net, daddr, 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, saddr, sport,
262 daddr, hnum, dif,
263 hslot2, slot2);
264 if (!result) {
265 hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum);
266 slot2 = hash2 & udptable->mask;
267 hslot2 = &udptable->hash2[slot2];
268 if (hslot->count < hslot2->count)
269 goto begin;
270
271 result = udp6_lib_lookup2(net, saddr, sport,
272 &in6addr_any, hnum, dif,
273 hslot2, slot2);
274 }
275 rcu_read_unlock();
276 return result;
277 }
278 begin:
279 result = NULL;
280 badness = -1;
281 sk_nulls_for_each_rcu(sk, node, &hslot->head) {
282 score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif);
283 if (score > badness) {
284 result = sk;
285 badness = score;
286 }
287 }
288 /*
289 * if the nulls value we got at the end of this lookup is
290 * not the expected one, we must restart lookup.
291 * We probably met an item that was moved to another chain.
292 */
293 if (get_nulls_value(node) != slot)
294 goto begin;
295
296 if (result) {
297 if (unlikely(!atomic_inc_not_zero(&result->sk_refcnt)))
298 result = NULL;
299 else if (unlikely(compute_score(result, net, hnum, saddr, sport,
300 daddr, dport, dif) < badness)) {
301 sock_put(result);
302 goto begin;
303 }
304 }
305 rcu_read_unlock();
306 return result;
307 }
308
309 static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb,
310 __be16 sport, __be16 dport,
311 struct udp_table *udptable)
312 {
313 struct sock *sk;
314 struct ipv6hdr *iph = ipv6_hdr(skb);
315
316 if (unlikely(sk = skb_steal_sock(skb)))
317 return sk;
318 return __udp6_lib_lookup(dev_net(skb_dst(skb)->dev), &iph->saddr, sport,
319 &iph->daddr, dport, inet6_iif(skb),
320 udptable);
321 }
322
323 /*
324 * This should be easy, if there is something there we
325 * return it, otherwise we block.
326 */
327
328 int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
329 struct msghdr *msg, size_t len,
330 int noblock, int flags, int *addr_len)
331 {
332 struct ipv6_pinfo *np = inet6_sk(sk);
333 struct inet_sock *inet = inet_sk(sk);
334 struct sk_buff *skb;
335 unsigned int ulen;
336 int peeked;
337 int err;
338 int is_udplite = IS_UDPLITE(sk);
339 int is_udp4;
340 bool slow;
341
342 if (addr_len)
343 *addr_len=sizeof(struct sockaddr_in6);
344
345 if (flags & MSG_ERRQUEUE)
346 return ipv6_recv_error(sk, msg, len);
347
348 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
349 return ipv6_recv_rxpmtu(sk, msg, len);
350
351 try_again:
352 skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),
353 &peeked, &err);
354 if (!skb)
355 goto out;
356
357 ulen = skb->len - sizeof(struct udphdr);
358 if (len > ulen)
359 len = ulen;
360 else if (len < ulen)
361 msg->msg_flags |= MSG_TRUNC;
362
363 is_udp4 = (skb->protocol == htons(ETH_P_IP));
364
365 /*
366 * If checksum is needed at all, try to do it while copying the
367 * data. If the data is truncated, or if we only want a partial
368 * coverage checksum (UDP-Lite), do it before the copy.
369 */
370
371 if (len < ulen || UDP_SKB_CB(skb)->partial_cov) {
372 if (udp_lib_checksum_complete(skb))
373 goto csum_copy_err;
374 }
375
376 if (skb_csum_unnecessary(skb))
377 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr),
378 msg->msg_iov,len);
379 else {
380 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
381 if (err == -EINVAL)
382 goto csum_copy_err;
383 }
384 if (err)
385 goto out_free;
386
387 if (!peeked) {
388 if (is_udp4)
389 UDP_INC_STATS_USER(sock_net(sk),
390 UDP_MIB_INDATAGRAMS, is_udplite);
391 else
392 UDP6_INC_STATS_USER(sock_net(sk),
393 UDP_MIB_INDATAGRAMS, is_udplite);
394 }
395
396 sock_recv_ts_and_drops(msg, sk, skb);
397
398 /* Copy the address. */
399 if (msg->msg_name) {
400 struct sockaddr_in6 *sin6;
401
402 sin6 = (struct sockaddr_in6 *) msg->msg_name;
403 sin6->sin6_family = AF_INET6;
404 sin6->sin6_port = udp_hdr(skb)->source;
405 sin6->sin6_flowinfo = 0;
406 sin6->sin6_scope_id = 0;
407
408 if (is_udp4)
409 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
410 &sin6->sin6_addr);
411 else {
412 ipv6_addr_copy(&sin6->sin6_addr,
413 &ipv6_hdr(skb)->saddr);
414 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
415 sin6->sin6_scope_id = IP6CB(skb)->iif;
416 }
417
418 }
419 if (is_udp4) {
420 if (inet->cmsg_flags)
421 ip_cmsg_recv(msg, skb);
422 } else {
423 if (np->rxopt.all)
424 datagram_recv_ctl(sk, msg, skb);
425 }
426
427 err = len;
428 if (flags & MSG_TRUNC)
429 err = ulen;
430
431 out_free:
432 skb_free_datagram_locked(sk, skb);
433 out:
434 return err;
435
436 csum_copy_err:
437 slow = lock_sock_fast(sk);
438 if (!skb_kill_datagram(sk, skb, flags)) {
439 if (is_udp4)
440 UDP_INC_STATS_USER(sock_net(sk),
441 UDP_MIB_INERRORS, is_udplite);
442 else
443 UDP6_INC_STATS_USER(sock_net(sk),
444 UDP_MIB_INERRORS, is_udplite);
445 }
446 unlock_sock_fast(sk, slow);
447
448 if (flags & MSG_DONTWAIT)
449 return -EAGAIN;
450 goto try_again;
451 }
452
453 void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
454 u8 type, u8 code, int offset, __be32 info,
455 struct udp_table *udptable)
456 {
457 struct ipv6_pinfo *np;
458 struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data;
459 struct in6_addr *saddr = &hdr->saddr;
460 struct in6_addr *daddr = &hdr->daddr;
461 struct udphdr *uh = (struct udphdr*)(skb->data+offset);
462 struct sock *sk;
463 int err;
464
465 sk = __udp6_lib_lookup(dev_net(skb->dev), daddr, uh->dest,
466 saddr, uh->source, inet6_iif(skb), udptable);
467 if (sk == NULL)
468 return;
469
470 np = inet6_sk(sk);
471
472 if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
473 goto out;
474
475 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
476 goto out;
477
478 if (np->recverr)
479 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
480
481 sk->sk_err = err;
482 sk->sk_error_report(sk);
483 out:
484 sock_put(sk);
485 }
486
487 static __inline__ void udpv6_err(struct sk_buff *skb,
488 struct inet6_skb_parm *opt, u8 type,
489 u8 code, int offset, __be32 info )
490 {
491 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table);
492 }
493
494 int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
495 {
496 struct udp_sock *up = udp_sk(sk);
497 int rc;
498 int is_udplite = IS_UDPLITE(sk);
499
500 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
501 goto drop;
502
503 /*
504 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
505 */
506 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
507
508 if (up->pcrlen == 0) { /* full coverage was set */
509 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage"
510 " %d while full coverage %d requested\n",
511 UDP_SKB_CB(skb)->cscov, skb->len);
512 goto drop;
513 }
514 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
515 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d "
516 "too small, need min %d\n",
517 UDP_SKB_CB(skb)->cscov, up->pcrlen);
518 goto drop;
519 }
520 }
521
522 if (sk->sk_filter) {
523 if (udp_lib_checksum_complete(skb))
524 goto drop;
525 }
526
527 if ((rc = ip_queue_rcv_skb(sk, skb)) < 0) {
528 /* Note that an ENOMEM error is charged twice */
529 if (rc == -ENOMEM)
530 UDP6_INC_STATS_BH(sock_net(sk),
531 UDP_MIB_RCVBUFERRORS, is_udplite);
532 goto drop_no_sk_drops_inc;
533 }
534
535 return 0;
536 drop:
537 atomic_inc(&sk->sk_drops);
538 drop_no_sk_drops_inc:
539 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
540 kfree_skb(skb);
541 return -1;
542 }
543
544 static struct sock *udp_v6_mcast_next(struct net *net, struct sock *sk,
545 __be16 loc_port, struct in6_addr *loc_addr,
546 __be16 rmt_port, struct in6_addr *rmt_addr,
547 int dif)
548 {
549 struct hlist_nulls_node *node;
550 struct sock *s = sk;
551 unsigned short num = ntohs(loc_port);
552
553 sk_nulls_for_each_from(s, node) {
554 struct inet_sock *inet = inet_sk(s);
555
556 if (!net_eq(sock_net(s), net))
557 continue;
558
559 if (udp_sk(s)->udp_port_hash == num &&
560 s->sk_family == PF_INET6) {
561 struct ipv6_pinfo *np = inet6_sk(s);
562 if (inet->inet_dport) {
563 if (inet->inet_dport != rmt_port)
564 continue;
565 }
566 if (!ipv6_addr_any(&np->daddr) &&
567 !ipv6_addr_equal(&np->daddr, rmt_addr))
568 continue;
569
570 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)
571 continue;
572
573 if (!ipv6_addr_any(&np->rcv_saddr)) {
574 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr))
575 continue;
576 }
577 if (!inet6_mc_check(s, loc_addr, rmt_addr))
578 continue;
579 return s;
580 }
581 }
582 return NULL;
583 }
584
585 static void flush_stack(struct sock **stack, unsigned int count,
586 struct sk_buff *skb, unsigned int final)
587 {
588 unsigned int i;
589 struct sock *sk;
590 struct sk_buff *skb1;
591
592 for (i = 0; i < count; i++) {
593 skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC);
594
595 sk = stack[i];
596 if (skb1) {
597 if (sk_rcvqueues_full(sk, skb)) {
598 kfree_skb(skb1);
599 goto drop;
600 }
601 bh_lock_sock(sk);
602 if (!sock_owned_by_user(sk))
603 udpv6_queue_rcv_skb(sk, skb1);
604 else if (sk_add_backlog(sk, skb1)) {
605 kfree_skb(skb1);
606 bh_unlock_sock(sk);
607 goto drop;
608 }
609 bh_unlock_sock(sk);
610 continue;
611 }
612 drop:
613 atomic_inc(&sk->sk_drops);
614 UDP6_INC_STATS_BH(sock_net(sk),
615 UDP_MIB_RCVBUFERRORS, IS_UDPLITE(sk));
616 UDP6_INC_STATS_BH(sock_net(sk),
617 UDP_MIB_INERRORS, IS_UDPLITE(sk));
618 }
619 }
620 /*
621 * Note: called only from the BH handler context,
622 * so we don't need to lock the hashes.
623 */
624 static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
625 struct in6_addr *saddr, struct in6_addr *daddr,
626 struct udp_table *udptable)
627 {
628 struct sock *sk, *stack[256 / sizeof(struct sock *)];
629 const struct udphdr *uh = udp_hdr(skb);
630 struct udp_hslot *hslot = udp_hashslot(udptable, net, ntohs(uh->dest));
631 int dif;
632 unsigned int i, count = 0;
633
634 spin_lock(&hslot->lock);
635 sk = sk_nulls_head(&hslot->head);
636 dif = inet6_iif(skb);
637 sk = udp_v6_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif);
638 while (sk) {
639 stack[count++] = sk;
640 sk = udp_v6_mcast_next(net, sk_nulls_next(sk), uh->dest, daddr,
641 uh->source, saddr, dif);
642 if (unlikely(count == ARRAY_SIZE(stack))) {
643 if (!sk)
644 break;
645 flush_stack(stack, count, skb, ~0);
646 count = 0;
647 }
648 }
649 /*
650 * before releasing the lock, we must take reference on sockets
651 */
652 for (i = 0; i < count; i++)
653 sock_hold(stack[i]);
654
655 spin_unlock(&hslot->lock);
656
657 if (count) {
658 flush_stack(stack, count, skb, count - 1);
659
660 for (i = 0; i < count; i++)
661 sock_put(stack[i]);
662 } else {
663 kfree_skb(skb);
664 }
665 return 0;
666 }
667
668 static inline int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh,
669 int proto)
670 {
671 int err;
672
673 UDP_SKB_CB(skb)->partial_cov = 0;
674 UDP_SKB_CB(skb)->cscov = skb->len;
675
676 if (proto == IPPROTO_UDPLITE) {
677 err = udplite_checksum_init(skb, uh);
678 if (err)
679 return err;
680 }
681
682 if (uh->check == 0) {
683 /* RFC 2460 section 8.1 says that we SHOULD log
684 this error. Well, it is reasonable.
685 */
686 LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n");
687 return 1;
688 }
689 if (skb->ip_summed == CHECKSUM_COMPLETE &&
690 !csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
691 skb->len, proto, skb->csum))
692 skb->ip_summed = CHECKSUM_UNNECESSARY;
693
694 if (!skb_csum_unnecessary(skb))
695 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
696 &ipv6_hdr(skb)->daddr,
697 skb->len, proto, 0));
698
699 return 0;
700 }
701
702 int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
703 int proto)
704 {
705 struct net *net = dev_net(skb->dev);
706 struct sock *sk;
707 struct udphdr *uh;
708 struct in6_addr *saddr, *daddr;
709 u32 ulen = 0;
710
711 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
712 goto discard;
713
714 saddr = &ipv6_hdr(skb)->saddr;
715 daddr = &ipv6_hdr(skb)->daddr;
716 uh = udp_hdr(skb);
717
718 ulen = ntohs(uh->len);
719 if (ulen > skb->len)
720 goto short_packet;
721
722 if (proto == IPPROTO_UDP) {
723 /* UDP validates ulen. */
724
725 /* Check for jumbo payload */
726 if (ulen == 0)
727 ulen = skb->len;
728
729 if (ulen < sizeof(*uh))
730 goto short_packet;
731
732 if (ulen < skb->len) {
733 if (pskb_trim_rcsum(skb, ulen))
734 goto short_packet;
735 saddr = &ipv6_hdr(skb)->saddr;
736 daddr = &ipv6_hdr(skb)->daddr;
737 uh = udp_hdr(skb);
738 }
739 }
740
741 if (udp6_csum_init(skb, uh, proto))
742 goto discard;
743
744 /*
745 * Multicast receive code
746 */
747 if (ipv6_addr_is_multicast(daddr))
748 return __udp6_lib_mcast_deliver(net, skb,
749 saddr, daddr, udptable);
750
751 /* Unicast */
752
753 /*
754 * check socket cache ... must talk to Alan about his plans
755 * for sock caches... i'll skip this for now.
756 */
757 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
758
759 if (sk == NULL) {
760 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
761 goto discard;
762
763 if (udp_lib_checksum_complete(skb))
764 goto discard;
765 UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS,
766 proto == IPPROTO_UDPLITE);
767
768 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
769
770 kfree_skb(skb);
771 return 0;
772 }
773
774 /* deliver */
775
776 if (sk_rcvqueues_full(sk, skb)) {
777 sock_put(sk);
778 goto discard;
779 }
780 bh_lock_sock(sk);
781 if (!sock_owned_by_user(sk))
782 udpv6_queue_rcv_skb(sk, skb);
783 else if (sk_add_backlog(sk, skb)) {
784 atomic_inc(&sk->sk_drops);
785 bh_unlock_sock(sk);
786 sock_put(sk);
787 goto discard;
788 }
789 bh_unlock_sock(sk);
790 sock_put(sk);
791 return 0;
792
793 short_packet:
794 LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n",
795 proto == IPPROTO_UDPLITE ? "-Lite" : "",
796 saddr,
797 ntohs(uh->source),
798 ulen,
799 skb->len,
800 daddr,
801 ntohs(uh->dest));
802
803 discard:
804 UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
805 kfree_skb(skb);
806 return 0;
807 }
808
809 static __inline__ int udpv6_rcv(struct sk_buff *skb)
810 {
811 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP);
812 }
813
814 /*
815 * Throw away all pending data and cancel the corking. Socket is locked.
816 */
817 static void udp_v6_flush_pending_frames(struct sock *sk)
818 {
819 struct udp_sock *up = udp_sk(sk);
820
821 if (up->pending == AF_INET)
822 udp_flush_pending_frames(sk);
823 else if (up->pending) {
824 up->len = 0;
825 up->pending = 0;
826 ip6_flush_pending_frames(sk);
827 }
828 }
829
830 /**
831 * udp6_hwcsum_outgoing - handle outgoing HW checksumming
832 * @sk: socket we are sending on
833 * @skb: sk_buff containing the filled-in UDP header
834 * (checksum field must be zeroed out)
835 */
836 static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
837 const struct in6_addr *saddr,
838 const struct in6_addr *daddr, int len)
839 {
840 unsigned int offset;
841 struct udphdr *uh = udp_hdr(skb);
842 __wsum csum = 0;
843
844 if (skb_queue_len(&sk->sk_write_queue) == 1) {
845 /* Only one fragment on the socket. */
846 skb->csum_start = skb_transport_header(skb) - skb->head;
847 skb->csum_offset = offsetof(struct udphdr, check);
848 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0);
849 } else {
850 /*
851 * HW-checksum won't work as there are two or more
852 * fragments on the socket so that all csums of sk_buffs
853 * should be together
854 */
855 offset = skb_transport_offset(skb);
856 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
857
858 skb->ip_summed = CHECKSUM_NONE;
859
860 skb_queue_walk(&sk->sk_write_queue, skb) {
861 csum = csum_add(csum, skb->csum);
862 }
863
864 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP,
865 csum);
866 if (uh->check == 0)
867 uh->check = CSUM_MANGLED_0;
868 }
869 }
870
871 /*
872 * Sending
873 */
874
875 static int udp_v6_push_pending_frames(struct sock *sk)
876 {
877 struct sk_buff *skb;
878 struct udphdr *uh;
879 struct udp_sock *up = udp_sk(sk);
880 struct inet_sock *inet = inet_sk(sk);
881 struct flowi *fl = &inet->cork.fl;
882 int err = 0;
883 int is_udplite = IS_UDPLITE(sk);
884 __wsum csum = 0;
885
886 /* Grab the skbuff where UDP header space exists. */
887 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
888 goto out;
889
890 /*
891 * Create a UDP header
892 */
893 uh = udp_hdr(skb);
894 uh->source = fl->fl_ip_sport;
895 uh->dest = fl->fl_ip_dport;
896 uh->len = htons(up->len);
897 uh->check = 0;
898
899 if (is_udplite)
900 csum = udplite_csum_outgoing(sk, skb);
901 else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
902 udp6_hwcsum_outgoing(sk, skb, &fl->fl6_src, &fl->fl6_dst,
903 up->len);
904 goto send;
905 } else
906 csum = udp_csum_outgoing(sk, skb);
907
908 /* add protocol-dependent pseudo-header */
909 uh->check = csum_ipv6_magic(&fl->fl6_src, &fl->fl6_dst,
910 up->len, fl->proto, csum );
911 if (uh->check == 0)
912 uh->check = CSUM_MANGLED_0;
913
914 send:
915 err = ip6_push_pending_frames(sk);
916 if (err) {
917 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) {
918 UDP6_INC_STATS_USER(sock_net(sk),
919 UDP_MIB_SNDBUFERRORS, is_udplite);
920 err = 0;
921 }
922 } else
923 UDP6_INC_STATS_USER(sock_net(sk),
924 UDP_MIB_OUTDATAGRAMS, is_udplite);
925 out:
926 up->len = 0;
927 up->pending = 0;
928 return err;
929 }
930
931 int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
932 struct msghdr *msg, size_t len)
933 {
934 struct ipv6_txoptions opt_space;
935 struct udp_sock *up = udp_sk(sk);
936 struct inet_sock *inet = inet_sk(sk);
937 struct ipv6_pinfo *np = inet6_sk(sk);
938 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
939 struct in6_addr *daddr, *final_p, final;
940 struct ipv6_txoptions *opt = NULL;
941 struct ip6_flowlabel *flowlabel = NULL;
942 struct flowi fl;
943 struct dst_entry *dst;
944 int addr_len = msg->msg_namelen;
945 int ulen = len;
946 int hlimit = -1;
947 int tclass = -1;
948 int dontfrag = -1;
949 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
950 int err;
951 int connected = 0;
952 int is_udplite = IS_UDPLITE(sk);
953 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
954
955 /* destination address check */
956 if (sin6) {
957 if (addr_len < offsetof(struct sockaddr, sa_data))
958 return -EINVAL;
959
960 switch (sin6->sin6_family) {
961 case AF_INET6:
962 if (addr_len < SIN6_LEN_RFC2133)
963 return -EINVAL;
964 daddr = &sin6->sin6_addr;
965 break;
966 case AF_INET:
967 goto do_udp_sendmsg;
968 case AF_UNSPEC:
969 msg->msg_name = sin6 = NULL;
970 msg->msg_namelen = addr_len = 0;
971 daddr = NULL;
972 break;
973 default:
974 return -EINVAL;
975 }
976 } else if (!up->pending) {
977 if (sk->sk_state != TCP_ESTABLISHED)
978 return -EDESTADDRREQ;
979 daddr = &np->daddr;
980 } else
981 daddr = NULL;
982
983 if (daddr) {
984 if (ipv6_addr_v4mapped(daddr)) {
985 struct sockaddr_in sin;
986 sin.sin_family = AF_INET;
987 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport;
988 sin.sin_addr.s_addr = daddr->s6_addr32[3];
989 msg->msg_name = &sin;
990 msg->msg_namelen = sizeof(sin);
991 do_udp_sendmsg:
992 if (__ipv6_only_sock(sk))
993 return -ENETUNREACH;
994 return udp_sendmsg(iocb, sk, msg, len);
995 }
996 }
997
998 if (up->pending == AF_INET)
999 return udp_sendmsg(iocb, sk, msg, len);
1000
1001 /* Rough check on arithmetic overflow,
1002 better check is made in ip6_append_data().
1003 */
1004 if (len > INT_MAX - sizeof(struct udphdr))
1005 return -EMSGSIZE;
1006
1007 if (up->pending) {
1008 /*
1009 * There are pending frames.
1010 * The socket lock must be held while it's corked.
1011 */
1012 lock_sock(sk);
1013 if (likely(up->pending)) {
1014 if (unlikely(up->pending != AF_INET6)) {
1015 release_sock(sk);
1016 return -EAFNOSUPPORT;
1017 }
1018 dst = NULL;
1019 goto do_append_data;
1020 }
1021 release_sock(sk);
1022 }
1023 ulen += sizeof(struct udphdr);
1024
1025 memset(&fl, 0, sizeof(fl));
1026
1027 if (sin6) {
1028 if (sin6->sin6_port == 0)
1029 return -EINVAL;
1030
1031 fl.fl_ip_dport = sin6->sin6_port;
1032 daddr = &sin6->sin6_addr;
1033
1034 if (np->sndflow) {
1035 fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
1036 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
1037 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
1038 if (flowlabel == NULL)
1039 return -EINVAL;
1040 daddr = &flowlabel->dst;
1041 }
1042 }
1043
1044 /*
1045 * Otherwise it will be difficult to maintain
1046 * sk->sk_dst_cache.
1047 */
1048 if (sk->sk_state == TCP_ESTABLISHED &&
1049 ipv6_addr_equal(daddr, &np->daddr))
1050 daddr = &np->daddr;
1051
1052 if (addr_len >= sizeof(struct sockaddr_in6) &&
1053 sin6->sin6_scope_id &&
1054 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
1055 fl.oif = sin6->sin6_scope_id;
1056 } else {
1057 if (sk->sk_state != TCP_ESTABLISHED)
1058 return -EDESTADDRREQ;
1059
1060 fl.fl_ip_dport = inet->inet_dport;
1061 daddr = &np->daddr;
1062 fl.fl6_flowlabel = np->flow_label;
1063 connected = 1;
1064 }
1065
1066 if (!fl.oif)
1067 fl.oif = sk->sk_bound_dev_if;
1068
1069 if (!fl.oif)
1070 fl.oif = np->sticky_pktinfo.ipi6_ifindex;
1071
1072 fl.mark = sk->sk_mark;
1073
1074 if (msg->msg_controllen) {
1075 opt = &opt_space;
1076 memset(opt, 0, sizeof(struct ipv6_txoptions));
1077 opt->tot_len = sizeof(*opt);
1078
1079 err = datagram_send_ctl(sock_net(sk), msg, &fl, opt, &hlimit,
1080 &tclass, &dontfrag);
1081 if (err < 0) {
1082 fl6_sock_release(flowlabel);
1083 return err;
1084 }
1085 if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
1086 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
1087 if (flowlabel == NULL)
1088 return -EINVAL;
1089 }
1090 if (!(opt->opt_nflen|opt->opt_flen))
1091 opt = NULL;
1092 connected = 0;
1093 }
1094 if (opt == NULL)
1095 opt = np->opt;
1096 if (flowlabel)
1097 opt = fl6_merge_options(&opt_space, flowlabel, opt);
1098 opt = ipv6_fixup_options(&opt_space, opt);
1099
1100 fl.proto = sk->sk_protocol;
1101 if (!ipv6_addr_any(daddr))
1102 ipv6_addr_copy(&fl.fl6_dst, daddr);
1103 else
1104 fl.fl6_dst.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
1105 if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr))
1106 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
1107 fl.fl_ip_sport = inet->inet_sport;
1108
1109 final_p = fl6_update_dst(&fl, opt, &final);
1110 if (final_p)
1111 connected = 0;
1112
1113 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) {
1114 fl.oif = np->mcast_oif;
1115 connected = 0;
1116 }
1117
1118 security_sk_classify_flow(sk, &fl);
1119
1120 err = ip6_sk_dst_lookup(sk, &dst, &fl);
1121 if (err)
1122 goto out;
1123 if (final_p)
1124 ipv6_addr_copy(&fl.fl6_dst, final_p);
1125
1126 err = __xfrm_lookup(sock_net(sk), &dst, &fl, sk, XFRM_LOOKUP_WAIT);
1127 if (err < 0) {
1128 if (err == -EREMOTE)
1129 err = ip6_dst_blackhole(sk, &dst, &fl);
1130 if (err < 0)
1131 goto out;
1132 }
1133
1134 if (hlimit < 0) {
1135 if (ipv6_addr_is_multicast(&fl.fl6_dst))
1136 hlimit = np->mcast_hops;
1137 else
1138 hlimit = np->hop_limit;
1139 if (hlimit < 0)
1140 hlimit = ip6_dst_hoplimit(dst);
1141 }
1142
1143 if (tclass < 0)
1144 tclass = np->tclass;
1145
1146 if (dontfrag < 0)
1147 dontfrag = np->dontfrag;
1148
1149 if (msg->msg_flags&MSG_CONFIRM)
1150 goto do_confirm;
1151 back_from_confirm:
1152
1153 lock_sock(sk);
1154 if (unlikely(up->pending)) {
1155 /* The socket is already corked while preparing it. */
1156 /* ... which is an evident application bug. --ANK */
1157 release_sock(sk);
1158
1159 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
1160 err = -EINVAL;
1161 goto out;
1162 }
1163
1164 up->pending = AF_INET6;
1165
1166 do_append_data:
1167 up->len += ulen;
1168 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
1169 err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen,
1170 sizeof(struct udphdr), hlimit, tclass, opt, &fl,
1171 (struct rt6_info*)dst,
1172 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, dontfrag);
1173 if (err)
1174 udp_v6_flush_pending_frames(sk);
1175 else if (!corkreq)
1176 err = udp_v6_push_pending_frames(sk);
1177 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
1178 up->pending = 0;
1179
1180 if (dst) {
1181 if (connected) {
1182 ip6_dst_store(sk, dst,
1183 ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ?
1184 &np->daddr : NULL,
1185 #ifdef CONFIG_IPV6_SUBTREES
1186 ipv6_addr_equal(&fl.fl6_src, &np->saddr) ?
1187 &np->saddr :
1188 #endif
1189 NULL);
1190 } else {
1191 dst_release(dst);
1192 }
1193 dst = NULL;
1194 }
1195
1196 if (err > 0)
1197 err = np->recverr ? net_xmit_errno(err) : 0;
1198 release_sock(sk);
1199 out:
1200 dst_release(dst);
1201 fl6_sock_release(flowlabel);
1202 if (!err)
1203 return len;
1204 /*
1205 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
1206 * ENOBUFS might not be good (it's not tunable per se), but otherwise
1207 * we don't have a good statistic (IpOutDiscards but it can be too many
1208 * things). We could add another new stat but at least for now that
1209 * seems like overkill.
1210 */
1211 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
1212 UDP6_INC_STATS_USER(sock_net(sk),
1213 UDP_MIB_SNDBUFERRORS, is_udplite);
1214 }
1215 return err;
1216
1217 do_confirm:
1218 dst_confirm(dst);
1219 if (!(msg->msg_flags&MSG_PROBE) || len)
1220 goto back_from_confirm;
1221 err = 0;
1222 goto out;
1223 }
1224
1225 void udpv6_destroy_sock(struct sock *sk)
1226 {
1227 lock_sock(sk);
1228 udp_v6_flush_pending_frames(sk);
1229 release_sock(sk);
1230
1231 inet6_destroy_sock(sk);
1232 }
1233
1234 /*
1235 * Socket option code for UDP
1236 */
1237 int udpv6_setsockopt(struct sock *sk, int level, int optname,
1238 char __user *optval, unsigned int optlen)
1239 {
1240 if (level == SOL_UDP || level == SOL_UDPLITE)
1241 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1242 udp_v6_push_pending_frames);
1243 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1244 }
1245
1246 #ifdef CONFIG_COMPAT
1247 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
1248 char __user *optval, unsigned int optlen)
1249 {
1250 if (level == SOL_UDP || level == SOL_UDPLITE)
1251 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1252 udp_v6_push_pending_frames);
1253 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
1254 }
1255 #endif
1256
1257 int 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 ipv6_getsockopt(sk, level, optname, optval, optlen);
1263 }
1264
1265 #ifdef CONFIG_COMPAT
1266 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
1267 char __user *optval, int __user *optlen)
1268 {
1269 if (level == SOL_UDP || level == SOL_UDPLITE)
1270 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1271 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
1272 }
1273 #endif
1274
1275 static int udp6_ufo_send_check(struct sk_buff *skb)
1276 {
1277 struct ipv6hdr *ipv6h;
1278 struct udphdr *uh;
1279
1280 if (!pskb_may_pull(skb, sizeof(*uh)))
1281 return -EINVAL;
1282
1283 ipv6h = ipv6_hdr(skb);
1284 uh = udp_hdr(skb);
1285
1286 uh->check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr, skb->len,
1287 IPPROTO_UDP, 0);
1288 skb->csum_start = skb_transport_header(skb) - skb->head;
1289 skb->csum_offset = offsetof(struct udphdr, check);
1290 skb->ip_summed = CHECKSUM_PARTIAL;
1291 return 0;
1292 }
1293
1294 static struct sk_buff *udp6_ufo_fragment(struct sk_buff *skb, int features)
1295 {
1296 struct sk_buff *segs = ERR_PTR(-EINVAL);
1297 unsigned int mss;
1298 unsigned int unfrag_ip6hlen, unfrag_len;
1299 struct frag_hdr *fptr;
1300 u8 *mac_start, *prevhdr;
1301 u8 nexthdr;
1302 u8 frag_hdr_sz = sizeof(struct frag_hdr);
1303 int offset;
1304 __wsum csum;
1305
1306 mss = skb_shinfo(skb)->gso_size;
1307 if (unlikely(skb->len <= mss))
1308 goto out;
1309
1310 if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) {
1311 /* Packet is from an untrusted source, reset gso_segs. */
1312 int type = skb_shinfo(skb)->gso_type;
1313
1314 if (unlikely(type & ~(SKB_GSO_UDP | SKB_GSO_DODGY) ||
1315 !(type & (SKB_GSO_UDP))))
1316 goto out;
1317
1318 skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(skb->len, mss);
1319
1320 segs = NULL;
1321 goto out;
1322 }
1323
1324 /* Do software UFO. Complete and fill in the UDP checksum as HW cannot
1325 * do checksum of UDP packets sent as multiple IP fragments.
1326 */
1327 offset = skb->csum_start - skb_headroom(skb);
1328 csum = skb_checksum(skb, offset, skb->len- offset, 0);
1329 offset += skb->csum_offset;
1330 *(__sum16 *)(skb->data + offset) = csum_fold(csum);
1331 skb->ip_summed = CHECKSUM_NONE;
1332
1333 /* Check if there is enough headroom to insert fragment header. */
1334 if ((skb_headroom(skb) < frag_hdr_sz) &&
1335 pskb_expand_head(skb, frag_hdr_sz, 0, GFP_ATOMIC))
1336 goto out;
1337
1338 /* Find the unfragmentable header and shift it left by frag_hdr_sz
1339 * bytes to insert fragment header.
1340 */
1341 unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr);
1342 nexthdr = *prevhdr;
1343 *prevhdr = NEXTHDR_FRAGMENT;
1344 unfrag_len = skb_network_header(skb) - skb_mac_header(skb) +
1345 unfrag_ip6hlen;
1346 mac_start = skb_mac_header(skb);
1347 memmove(mac_start-frag_hdr_sz, mac_start, unfrag_len);
1348
1349 skb->mac_header -= frag_hdr_sz;
1350 skb->network_header -= frag_hdr_sz;
1351
1352 fptr = (struct frag_hdr *)(skb_network_header(skb) + unfrag_ip6hlen);
1353 fptr->nexthdr = nexthdr;
1354 fptr->reserved = 0;
1355 ipv6_select_ident(fptr);
1356
1357 /* Fragment the skb. ipv6 header and the remaining fields of the
1358 * fragment header are updated in ipv6_gso_segment()
1359 */
1360 segs = skb_segment(skb, features);
1361
1362 out:
1363 return segs;
1364 }
1365
1366 static const struct inet6_protocol udpv6_protocol = {
1367 .handler = udpv6_rcv,
1368 .err_handler = udpv6_err,
1369 .gso_send_check = udp6_ufo_send_check,
1370 .gso_segment = udp6_ufo_fragment,
1371 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1372 };
1373
1374 /* ------------------------------------------------------------------------ */
1375 #ifdef CONFIG_PROC_FS
1376
1377 static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket)
1378 {
1379 struct inet_sock *inet = inet_sk(sp);
1380 struct ipv6_pinfo *np = inet6_sk(sp);
1381 struct in6_addr *dest, *src;
1382 __u16 destp, srcp;
1383
1384 dest = &np->daddr;
1385 src = &np->rcv_saddr;
1386 destp = ntohs(inet->inet_dport);
1387 srcp = ntohs(inet->inet_sport);
1388 seq_printf(seq,
1389 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1390 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %d\n",
1391 bucket,
1392 src->s6_addr32[0], src->s6_addr32[1],
1393 src->s6_addr32[2], src->s6_addr32[3], srcp,
1394 dest->s6_addr32[0], dest->s6_addr32[1],
1395 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1396 sp->sk_state,
1397 sk_wmem_alloc_get(sp),
1398 sk_rmem_alloc_get(sp),
1399 0, 0L, 0,
1400 sock_i_uid(sp), 0,
1401 sock_i_ino(sp),
1402 atomic_read(&sp->sk_refcnt), sp,
1403 atomic_read(&sp->sk_drops));
1404 }
1405
1406 int udp6_seq_show(struct seq_file *seq, void *v)
1407 {
1408 if (v == SEQ_START_TOKEN)
1409 seq_printf(seq,
1410 " sl "
1411 "local_address "
1412 "remote_address "
1413 "st tx_queue rx_queue tr tm->when retrnsmt"
1414 " uid timeout inode ref pointer drops\n");
1415 else
1416 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket);
1417 return 0;
1418 }
1419
1420 static struct udp_seq_afinfo udp6_seq_afinfo = {
1421 .name = "udp6",
1422 .family = AF_INET6,
1423 .udp_table = &udp_table,
1424 .seq_fops = {
1425 .owner = THIS_MODULE,
1426 },
1427 .seq_ops = {
1428 .show = udp6_seq_show,
1429 },
1430 };
1431
1432 int __net_init udp6_proc_init(struct net *net)
1433 {
1434 return udp_proc_register(net, &udp6_seq_afinfo);
1435 }
1436
1437 void udp6_proc_exit(struct net *net) {
1438 udp_proc_unregister(net, &udp6_seq_afinfo);
1439 }
1440 #endif /* CONFIG_PROC_FS */
1441
1442 /* ------------------------------------------------------------------------ */
1443
1444 struct proto udpv6_prot = {
1445 .name = "UDPv6",
1446 .owner = THIS_MODULE,
1447 .close = udp_lib_close,
1448 .connect = ip6_datagram_connect,
1449 .disconnect = udp_disconnect,
1450 .ioctl = udp_ioctl,
1451 .destroy = udpv6_destroy_sock,
1452 .setsockopt = udpv6_setsockopt,
1453 .getsockopt = udpv6_getsockopt,
1454 .sendmsg = udpv6_sendmsg,
1455 .recvmsg = udpv6_recvmsg,
1456 .backlog_rcv = udpv6_queue_rcv_skb,
1457 .hash = udp_lib_hash,
1458 .unhash = udp_lib_unhash,
1459 .rehash = udp_v6_rehash,
1460 .get_port = udp_v6_get_port,
1461 .memory_allocated = &udp_memory_allocated,
1462 .sysctl_mem = sysctl_udp_mem,
1463 .sysctl_wmem = &sysctl_udp_wmem_min,
1464 .sysctl_rmem = &sysctl_udp_rmem_min,
1465 .obj_size = sizeof(struct udp6_sock),
1466 .slab_flags = SLAB_DESTROY_BY_RCU,
1467 .h.udp_table = &udp_table,
1468 #ifdef CONFIG_COMPAT
1469 .compat_setsockopt = compat_udpv6_setsockopt,
1470 .compat_getsockopt = compat_udpv6_getsockopt,
1471 #endif
1472 };
1473
1474 static struct inet_protosw udpv6_protosw = {
1475 .type = SOCK_DGRAM,
1476 .protocol = IPPROTO_UDP,
1477 .prot = &udpv6_prot,
1478 .ops = &inet6_dgram_ops,
1479 .no_check = UDP_CSUM_DEFAULT,
1480 .flags = INET_PROTOSW_PERMANENT,
1481 };
1482
1483
1484 int __init udpv6_init(void)
1485 {
1486 int ret;
1487
1488 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
1489 if (ret)
1490 goto out;
1491
1492 ret = inet6_register_protosw(&udpv6_protosw);
1493 if (ret)
1494 goto out_udpv6_protocol;
1495 out:
1496 return ret;
1497
1498 out_udpv6_protocol:
1499 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1500 goto out;
1501 }
1502
1503 void udpv6_exit(void)
1504 {
1505 inet6_unregister_protosw(&udpv6_protosw);
1506 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1507 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree