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fs/xfs/quota: Add missing mutex_unlock
[linux-2.6/cjktty.git] / net / ipv6 / udp.c
blob90824852f598d34f4c544392e247a6f93a7bd0b0
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(addr6->s6_addr32[3], mix);
95 else
96 hash = jhash2(addr6->s6_addr32, 4, mix);
97
98 return hash ^ port;
99 }
100
101
102 int udp_v6_get_port(struct sock *sk, unsigned short snum)
103 {
104 unsigned int hash2_nulladdr =
105 udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum);
106 unsigned int hash2_partial =
107 udp6_portaddr_hash(sock_net(sk), &inet6_sk(sk)->rcv_saddr, 0);
108
109 /* precompute partial secondary hash */
110 udp_sk(sk)->udp_portaddr_hash = hash2_partial;
111 return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal, hash2_nulladdr);
112 }
113
114 static inline int compute_score(struct sock *sk, struct net *net,
115 unsigned short hnum,
116 struct in6_addr *saddr, __be16 sport,
117 struct in6_addr *daddr, __be16 dport,
118 int dif)
119 {
120 int score = -1;
121
122 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum &&
123 sk->sk_family == PF_INET6) {
124 struct ipv6_pinfo *np = inet6_sk(sk);
125 struct inet_sock *inet = inet_sk(sk);
126
127 score = 0;
128 if (inet->inet_dport) {
129 if (inet->inet_dport != sport)
130 return -1;
131 score++;
132 }
133 if (!ipv6_addr_any(&np->rcv_saddr)) {
134 if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
135 return -1;
136 score++;
137 }
138 if (!ipv6_addr_any(&np->daddr)) {
139 if (!ipv6_addr_equal(&np->daddr, saddr))
140 return -1;
141 score++;
142 }
143 if (sk->sk_bound_dev_if) {
144 if (sk->sk_bound_dev_if != dif)
145 return -1;
146 score++;
147 }
148 }
149 return score;
150 }
151
152 #define SCORE2_MAX (1 + 1 + 1)
153 static inline int compute_score2(struct sock *sk, struct net *net,
154 const struct in6_addr *saddr, __be16 sport,
155 const struct in6_addr *daddr, unsigned short hnum,
156 int dif)
157 {
158 int score = -1;
159
160 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum &&
161 sk->sk_family == PF_INET6) {
162 struct ipv6_pinfo *np = inet6_sk(sk);
163 struct inet_sock *inet = inet_sk(sk);
164
165 if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
166 return -1;
167 score = 0;
168 if (inet->inet_dport) {
169 if (inet->inet_dport != sport)
170 return -1;
171 score++;
172 }
173 if (!ipv6_addr_any(&np->daddr)) {
174 if (!ipv6_addr_equal(&np->daddr, saddr))
175 return -1;
176 score++;
177 }
178 if (sk->sk_bound_dev_if) {
179 if (sk->sk_bound_dev_if != dif)
180 return -1;
181 score++;
182 }
183 }
184 return score;
185 }
186
187
188 /* called with read_rcu_lock() */
189 static struct sock *udp6_lib_lookup2(struct net *net,
190 const struct in6_addr *saddr, __be16 sport,
191 const struct in6_addr *daddr, unsigned int hnum, int dif,
192 struct udp_hslot *hslot2, unsigned int slot2)
193 {
194 struct sock *sk, *result;
195 struct hlist_nulls_node *node;
196 int score, badness;
197
198 begin:
199 result = NULL;
200 badness = -1;
201 udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) {
202 score = compute_score2(sk, net, saddr, sport,
203 daddr, hnum, dif);
204 if (score > badness) {
205 result = sk;
206 badness = score;
207 if (score == SCORE2_MAX)
208 goto exact_match;
209 }
210 }
211 /*
212 * if the nulls value we got at the end of this lookup is
213 * not the expected one, we must restart lookup.
214 * We probably met an item that was moved to another chain.
215 */
216 if (get_nulls_value(node) != slot2)
217 goto begin;
218
219 if (result) {
220 exact_match:
221 if (unlikely(!atomic_inc_not_zero(&result->sk_refcnt)))
222 result = NULL;
223 else if (unlikely(compute_score2(result, net, saddr, sport,
224 daddr, hnum, dif) < badness)) {
225 sock_put(result);
226 goto begin;
227 }
228 }
229 return result;
230 }
231
232 static struct sock *__udp6_lib_lookup(struct net *net,
233 struct in6_addr *saddr, __be16 sport,
234 struct in6_addr *daddr, __be16 dport,
235 int dif, struct udp_table *udptable)
236 {
237 struct sock *sk, *result;
238 struct hlist_nulls_node *node;
239 unsigned short hnum = ntohs(dport);
240 unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask);
241 struct udp_hslot *hslot2, *hslot = &udptable->hash[slot];
242 int score, badness;
243
244 rcu_read_lock();
245 if (hslot->count > 10) {
246 hash2 = udp6_portaddr_hash(net, daddr, hnum);
247 slot2 = hash2 & udptable->mask;
248 hslot2 = &udptable->hash2[slot2];
249 if (hslot->count < hslot2->count)
250 goto begin;
251
252 result = udp6_lib_lookup2(net, saddr, sport,
253 daddr, hnum, dif,
254 hslot2, slot2);
255 if (!result) {
256 hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum);
257 slot2 = hash2 & udptable->mask;
258 hslot2 = &udptable->hash2[slot2];
259 if (hslot->count < hslot2->count)
260 goto begin;
261
262 result = udp6_lib_lookup2(net, saddr, sport,
263 &in6addr_any, hnum, dif,
264 hslot2, slot2);
265 }
266 rcu_read_unlock();
267 return result;
268 }
269 begin:
270 result = NULL;
271 badness = -1;
272 sk_nulls_for_each_rcu(sk, node, &hslot->head) {
273 score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif);
274 if (score > badness) {
275 result = sk;
276 badness = score;
277 }
278 }
279 /*
280 * if the nulls value we got at the end of this lookup is
281 * not the expected one, we must restart lookup.
282 * We probably met an item that was moved to another chain.
283 */
284 if (get_nulls_value(node) != slot)
285 goto begin;
286
287 if (result) {
288 if (unlikely(!atomic_inc_not_zero(&result->sk_refcnt)))
289 result = NULL;
290 else if (unlikely(compute_score(result, net, hnum, saddr, sport,
291 daddr, dport, dif) < badness)) {
292 sock_put(result);
293 goto begin;
294 }
295 }
296 rcu_read_unlock();
297 return result;
298 }
299
300 static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb,
301 __be16 sport, __be16 dport,
302 struct udp_table *udptable)
303 {
304 struct sock *sk;
305 struct ipv6hdr *iph = ipv6_hdr(skb);
306
307 if (unlikely(sk = skb_steal_sock(skb)))
308 return sk;
309 return __udp6_lib_lookup(dev_net(skb_dst(skb)->dev), &iph->saddr, sport,
310 &iph->daddr, dport, inet6_iif(skb),
311 udptable);
312 }
313
314 /*
315 * This should be easy, if there is something there we
316 * return it, otherwise we block.
317 */
318
319 int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
320 struct msghdr *msg, size_t len,
321 int noblock, int flags, int *addr_len)
322 {
323 struct ipv6_pinfo *np = inet6_sk(sk);
324 struct inet_sock *inet = inet_sk(sk);
325 struct sk_buff *skb;
326 unsigned int ulen;
327 int peeked;
328 int err;
329 int is_udplite = IS_UDPLITE(sk);
330 int is_udp4;
331
332 if (addr_len)
333 *addr_len=sizeof(struct sockaddr_in6);
334
335 if (flags & MSG_ERRQUEUE)
336 return ipv6_recv_error(sk, msg, len);
337
338 try_again:
339 skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),
340 &peeked, &err);
341 if (!skb)
342 goto out;
343
344 ulen = skb->len - sizeof(struct udphdr);
345 if (len > ulen)
346 len = ulen;
347 else if (len < 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 (len < 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,len);
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 = len;
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 if (sk_add_backlog(sk, skb1)) {
588 kfree_skb(skb1);
589 bh_unlock_sock(sk);
590 goto drop;
591 }
592 bh_unlock_sock(sk);
593 continue;
594 }
595 drop:
596 atomic_inc(&sk->sk_drops);
597 UDP6_INC_STATS_BH(sock_net(sk),
598 UDP_MIB_RCVBUFERRORS, IS_UDPLITE(sk));
599 UDP6_INC_STATS_BH(sock_net(sk),
600 UDP_MIB_INERRORS, IS_UDPLITE(sk));
601 }
602 }
603 /*
604 * Note: called only from the BH handler context,
605 * so we don't need to lock the hashes.
606 */
607 static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
608 struct in6_addr *saddr, struct in6_addr *daddr,
609 struct udp_table *udptable)
610 {
611 struct sock *sk, *stack[256 / sizeof(struct sock *)];
612 const struct udphdr *uh = udp_hdr(skb);
613 struct udp_hslot *hslot = udp_hashslot(udptable, net, ntohs(uh->dest));
614 int dif;
615 unsigned int i, count = 0;
616
617 spin_lock(&hslot->lock);
618 sk = sk_nulls_head(&hslot->head);
619 dif = inet6_iif(skb);
620 sk = udp_v6_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif);
621 while (sk) {
622 stack[count++] = sk;
623 sk = udp_v6_mcast_next(net, sk_nulls_next(sk), uh->dest, daddr,
624 uh->source, saddr, dif);
625 if (unlikely(count == ARRAY_SIZE(stack))) {
626 if (!sk)
627 break;
628 flush_stack(stack, count, skb, ~0);
629 count = 0;
630 }
631 }
632 /*
633 * before releasing the lock, we must take reference on sockets
634 */
635 for (i = 0; i < count; i++)
636 sock_hold(stack[i]);
637
638 spin_unlock(&hslot->lock);
639
640 if (count) {
641 flush_stack(stack, count, skb, count - 1);
642
643 for (i = 0; i < count; i++)
644 sock_put(stack[i]);
645 } else {
646 kfree_skb(skb);
647 }
648 return 0;
649 }
650
651 static inline int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh,
652 int proto)
653 {
654 int err;
655
656 UDP_SKB_CB(skb)->partial_cov = 0;
657 UDP_SKB_CB(skb)->cscov = skb->len;
658
659 if (proto == IPPROTO_UDPLITE) {
660 err = udplite_checksum_init(skb, uh);
661 if (err)
662 return err;
663 }
664
665 if (uh->check == 0) {
666 /* RFC 2460 section 8.1 says that we SHOULD log
667 this error. Well, it is reasonable.
668 */
669 LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n");
670 return 1;
671 }
672 if (skb->ip_summed == CHECKSUM_COMPLETE &&
673 !csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
674 skb->len, proto, skb->csum))
675 skb->ip_summed = CHECKSUM_UNNECESSARY;
676
677 if (!skb_csum_unnecessary(skb))
678 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
679 &ipv6_hdr(skb)->daddr,
680 skb->len, proto, 0));
681
682 return 0;
683 }
684
685 int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
686 int proto)
687 {
688 struct net *net = dev_net(skb->dev);
689 struct sock *sk;
690 struct udphdr *uh;
691 struct in6_addr *saddr, *daddr;
692 u32 ulen = 0;
693
694 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
695 goto short_packet;
696
697 saddr = &ipv6_hdr(skb)->saddr;
698 daddr = &ipv6_hdr(skb)->daddr;
699 uh = udp_hdr(skb);
700
701 ulen = ntohs(uh->len);
702 if (ulen > skb->len)
703 goto short_packet;
704
705 if (proto == IPPROTO_UDP) {
706 /* UDP validates ulen. */
707
708 /* Check for jumbo payload */
709 if (ulen == 0)
710 ulen = skb->len;
711
712 if (ulen < sizeof(*uh))
713 goto short_packet;
714
715 if (ulen < skb->len) {
716 if (pskb_trim_rcsum(skb, ulen))
717 goto short_packet;
718 saddr = &ipv6_hdr(skb)->saddr;
719 daddr = &ipv6_hdr(skb)->daddr;
720 uh = udp_hdr(skb);
721 }
722 }
723
724 if (udp6_csum_init(skb, uh, proto))
725 goto discard;
726
727 /*
728 * Multicast receive code
729 */
730 if (ipv6_addr_is_multicast(daddr))
731 return __udp6_lib_mcast_deliver(net, skb,
732 saddr, daddr, udptable);
733
734 /* Unicast */
735
736 /*
737 * check socket cache ... must talk to Alan about his plans
738 * for sock caches... i'll skip this for now.
739 */
740 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
741
742 if (sk == NULL) {
743 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
744 goto discard;
745
746 if (udp_lib_checksum_complete(skb))
747 goto discard;
748 UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS,
749 proto == IPPROTO_UDPLITE);
750
751 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
752
753 kfree_skb(skb);
754 return 0;
755 }
756
757 /* deliver */
758
759 bh_lock_sock(sk);
760 if (!sock_owned_by_user(sk))
761 udpv6_queue_rcv_skb(sk, skb);
762 else if (sk_add_backlog(sk, skb)) {
763 atomic_inc(&sk->sk_drops);
764 bh_unlock_sock(sk);
765 sock_put(sk);
766 goto discard;
767 }
768 bh_unlock_sock(sk);
769 sock_put(sk);
770 return 0;
771
772 short_packet:
773 LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: %d/%u\n",
774 proto == IPPROTO_UDPLITE ? "-Lite" : "",
775 ulen, skb->len);
776
777 discard:
778 UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
779 kfree_skb(skb);
780 return 0;
781 }
782
783 static __inline__ int udpv6_rcv(struct sk_buff *skb)
784 {
785 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP);
786 }
787
788 /*
789 * Throw away all pending data and cancel the corking. Socket is locked.
790 */
791 static void udp_v6_flush_pending_frames(struct sock *sk)
792 {
793 struct udp_sock *up = udp_sk(sk);
794
795 if (up->pending == AF_INET)
796 udp_flush_pending_frames(sk);
797 else if (up->pending) {
798 up->len = 0;
799 up->pending = 0;
800 ip6_flush_pending_frames(sk);
801 }
802 }
803
804 /**
805 * udp6_hwcsum_outgoing - handle outgoing HW checksumming
806 * @sk: socket we are sending on
807 * @skb: sk_buff containing the filled-in UDP header
808 * (checksum field must be zeroed out)
809 */
810 static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
811 const struct in6_addr *saddr,
812 const struct in6_addr *daddr, int len)
813 {
814 unsigned int offset;
815 struct udphdr *uh = udp_hdr(skb);
816 __wsum csum = 0;
817
818 if (skb_queue_len(&sk->sk_write_queue) == 1) {
819 /* Only one fragment on the socket. */
820 skb->csum_start = skb_transport_header(skb) - skb->head;
821 skb->csum_offset = offsetof(struct udphdr, check);
822 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0);
823 } else {
824 /*
825 * HW-checksum won't work as there are two or more
826 * fragments on the socket so that all csums of sk_buffs
827 * should be together
828 */
829 offset = skb_transport_offset(skb);
830 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
831
832 skb->ip_summed = CHECKSUM_NONE;
833
834 skb_queue_walk(&sk->sk_write_queue, skb) {
835 csum = csum_add(csum, skb->csum);
836 }
837
838 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP,
839 csum);
840 if (uh->check == 0)
841 uh->check = CSUM_MANGLED_0;
842 }
843 }
844
845 /*
846 * Sending
847 */
848
849 static int udp_v6_push_pending_frames(struct sock *sk)
850 {
851 struct sk_buff *skb;
852 struct udphdr *uh;
853 struct udp_sock *up = udp_sk(sk);
854 struct inet_sock *inet = inet_sk(sk);
855 struct flowi *fl = &inet->cork.fl;
856 int err = 0;
857 int is_udplite = IS_UDPLITE(sk);
858 __wsum csum = 0;
859
860 /* Grab the skbuff where UDP header space exists. */
861 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
862 goto out;
863
864 /*
865 * Create a UDP header
866 */
867 uh = udp_hdr(skb);
868 uh->source = fl->fl_ip_sport;
869 uh->dest = fl->fl_ip_dport;
870 uh->len = htons(up->len);
871 uh->check = 0;
872
873 if (is_udplite)
874 csum = udplite_csum_outgoing(sk, skb);
875 else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
876 udp6_hwcsum_outgoing(sk, skb, &fl->fl6_src, &fl->fl6_dst,
877 up->len);
878 goto send;
879 } else
880 csum = udp_csum_outgoing(sk, skb);
881
882 /* add protocol-dependent pseudo-header */
883 uh->check = csum_ipv6_magic(&fl->fl6_src, &fl->fl6_dst,
884 up->len, fl->proto, csum );
885 if (uh->check == 0)
886 uh->check = CSUM_MANGLED_0;
887
888 send:
889 err = ip6_push_pending_frames(sk);
890 if (err) {
891 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) {
892 UDP6_INC_STATS_USER(sock_net(sk),
893 UDP_MIB_SNDBUFERRORS, is_udplite);
894 err = 0;
895 }
896 } else
897 UDP6_INC_STATS_USER(sock_net(sk),
898 UDP_MIB_OUTDATAGRAMS, is_udplite);
899 out:
900 up->len = 0;
901 up->pending = 0;
902 return err;
903 }
904
905 int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
906 struct msghdr *msg, size_t len)
907 {
908 struct ipv6_txoptions opt_space;
909 struct udp_sock *up = udp_sk(sk);
910 struct inet_sock *inet = inet_sk(sk);
911 struct ipv6_pinfo *np = inet6_sk(sk);
912 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
913 struct in6_addr *daddr, *final_p = NULL, final;
914 struct ipv6_txoptions *opt = NULL;
915 struct ip6_flowlabel *flowlabel = NULL;
916 struct flowi fl;
917 struct dst_entry *dst;
918 int addr_len = msg->msg_namelen;
919 int ulen = len;
920 int hlimit = -1;
921 int tclass = -1;
922 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
923 int err;
924 int connected = 0;
925 int is_udplite = IS_UDPLITE(sk);
926 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
927
928 /* destination address check */
929 if (sin6) {
930 if (addr_len < offsetof(struct sockaddr, sa_data))
931 return -EINVAL;
932
933 switch (sin6->sin6_family) {
934 case AF_INET6:
935 if (addr_len < SIN6_LEN_RFC2133)
936 return -EINVAL;
937 daddr = &sin6->sin6_addr;
938 break;
939 case AF_INET:
940 goto do_udp_sendmsg;
941 case AF_UNSPEC:
942 msg->msg_name = sin6 = NULL;
943 msg->msg_namelen = addr_len = 0;
944 daddr = NULL;
945 break;
946 default:
947 return -EINVAL;
948 }
949 } else if (!up->pending) {
950 if (sk->sk_state != TCP_ESTABLISHED)
951 return -EDESTADDRREQ;
952 daddr = &np->daddr;
953 } else
954 daddr = NULL;
955
956 if (daddr) {
957 if (ipv6_addr_v4mapped(daddr)) {
958 struct sockaddr_in sin;
959 sin.sin_family = AF_INET;
960 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport;
961 sin.sin_addr.s_addr = daddr->s6_addr32[3];
962 msg->msg_name = &sin;
963 msg->msg_namelen = sizeof(sin);
964 do_udp_sendmsg:
965 if (__ipv6_only_sock(sk))
966 return -ENETUNREACH;
967 return udp_sendmsg(iocb, sk, msg, len);
968 }
969 }
970
971 if (up->pending == AF_INET)
972 return udp_sendmsg(iocb, sk, msg, len);
973
974 /* Rough check on arithmetic overflow,
975 better check is made in ip6_append_data().
976 */
977 if (len > INT_MAX - sizeof(struct udphdr))
978 return -EMSGSIZE;
979
980 if (up->pending) {
981 /*
982 * There are pending frames.
983 * The socket lock must be held while it's corked.
984 */
985 lock_sock(sk);
986 if (likely(up->pending)) {
987 if (unlikely(up->pending != AF_INET6)) {
988 release_sock(sk);
989 return -EAFNOSUPPORT;
990 }
991 dst = NULL;
992 goto do_append_data;
993 }
994 release_sock(sk);
995 }
996 ulen += sizeof(struct udphdr);
997
998 memset(&fl, 0, sizeof(fl));
999
1000 if (sin6) {
1001 if (sin6->sin6_port == 0)
1002 return -EINVAL;
1003
1004 fl.fl_ip_dport = sin6->sin6_port;
1005 daddr = &sin6->sin6_addr;
1006
1007 if (np->sndflow) {
1008 fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
1009 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
1010 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
1011 if (flowlabel == NULL)
1012 return -EINVAL;
1013 daddr = &flowlabel->dst;
1014 }
1015 }
1016
1017 /*
1018 * Otherwise it will be difficult to maintain
1019 * sk->sk_dst_cache.
1020 */
1021 if (sk->sk_state == TCP_ESTABLISHED &&
1022 ipv6_addr_equal(daddr, &np->daddr))
1023 daddr = &np->daddr;
1024
1025 if (addr_len >= sizeof(struct sockaddr_in6) &&
1026 sin6->sin6_scope_id &&
1027 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
1028 fl.oif = sin6->sin6_scope_id;
1029 } else {
1030 if (sk->sk_state != TCP_ESTABLISHED)
1031 return -EDESTADDRREQ;
1032
1033 fl.fl_ip_dport = inet->inet_dport;
1034 daddr = &np->daddr;
1035 fl.fl6_flowlabel = np->flow_label;
1036 connected = 1;
1037 }
1038
1039 if (!fl.oif)
1040 fl.oif = sk->sk_bound_dev_if;
1041
1042 if (!fl.oif)
1043 fl.oif = np->sticky_pktinfo.ipi6_ifindex;
1044
1045 fl.mark = sk->sk_mark;
1046
1047 if (msg->msg_controllen) {
1048 opt = &opt_space;
1049 memset(opt, 0, sizeof(struct ipv6_txoptions));
1050 opt->tot_len = sizeof(*opt);
1051
1052 err = datagram_send_ctl(sock_net(sk), msg, &fl, opt, &hlimit, &tclass);
1053 if (err < 0) {
1054 fl6_sock_release(flowlabel);
1055 return err;
1056 }
1057 if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
1058 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
1059 if (flowlabel == NULL)
1060 return -EINVAL;
1061 }
1062 if (!(opt->opt_nflen|opt->opt_flen))
1063 opt = NULL;
1064 connected = 0;
1065 }
1066 if (opt == NULL)
1067 opt = np->opt;
1068 if (flowlabel)
1069 opt = fl6_merge_options(&opt_space, flowlabel, opt);
1070 opt = ipv6_fixup_options(&opt_space, opt);
1071
1072 fl.proto = sk->sk_protocol;
1073 if (!ipv6_addr_any(daddr))
1074 ipv6_addr_copy(&fl.fl6_dst, daddr);
1075 else
1076 fl.fl6_dst.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
1077 if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr))
1078 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
1079 fl.fl_ip_sport = inet->inet_sport;
1080
1081 /* merge ip6_build_xmit from ip6_output */
1082 if (opt && opt->srcrt) {
1083 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
1084 ipv6_addr_copy(&final, &fl.fl6_dst);
1085 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
1086 final_p = &final;
1087 connected = 0;
1088 }
1089
1090 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) {
1091 fl.oif = np->mcast_oif;
1092 connected = 0;
1093 }
1094
1095 security_sk_classify_flow(sk, &fl);
1096
1097 err = ip6_sk_dst_lookup(sk, &dst, &fl);
1098 if (err)
1099 goto out;
1100 if (final_p)
1101 ipv6_addr_copy(&fl.fl6_dst, final_p);
1102
1103 err = __xfrm_lookup(sock_net(sk), &dst, &fl, sk, XFRM_LOOKUP_WAIT);
1104 if (err < 0) {
1105 if (err == -EREMOTE)
1106 err = ip6_dst_blackhole(sk, &dst, &fl);
1107 if (err < 0)
1108 goto out;
1109 }
1110
1111 if (hlimit < 0) {
1112 if (ipv6_addr_is_multicast(&fl.fl6_dst))
1113 hlimit = np->mcast_hops;
1114 else
1115 hlimit = np->hop_limit;
1116 if (hlimit < 0)
1117 hlimit = ip6_dst_hoplimit(dst);
1118 }
1119
1120 if (tclass < 0)
1121 tclass = np->tclass;
1122
1123 if (msg->msg_flags&MSG_CONFIRM)
1124 goto do_confirm;
1125 back_from_confirm:
1126
1127 lock_sock(sk);
1128 if (unlikely(up->pending)) {
1129 /* The socket is already corked while preparing it. */
1130 /* ... which is an evident application bug. --ANK */
1131 release_sock(sk);
1132
1133 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
1134 err = -EINVAL;
1135 goto out;
1136 }
1137
1138 up->pending = AF_INET6;
1139
1140 do_append_data:
1141 up->len += ulen;
1142 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
1143 err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen,
1144 sizeof(struct udphdr), hlimit, tclass, opt, &fl,
1145 (struct rt6_info*)dst,
1146 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
1147 if (err)
1148 udp_v6_flush_pending_frames(sk);
1149 else if (!corkreq)
1150 err = udp_v6_push_pending_frames(sk);
1151 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
1152 up->pending = 0;
1153
1154 if (dst) {
1155 if (connected) {
1156 ip6_dst_store(sk, dst,
1157 ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ?
1158 &np->daddr : NULL,
1159 #ifdef CONFIG_IPV6_SUBTREES
1160 ipv6_addr_equal(&fl.fl6_src, &np->saddr) ?
1161 &np->saddr :
1162 #endif
1163 NULL);
1164 } else {
1165 dst_release(dst);
1166 }
1167 dst = NULL;
1168 }
1169
1170 if (err > 0)
1171 err = np->recverr ? net_xmit_errno(err) : 0;
1172 release_sock(sk);
1173 out:
1174 dst_release(dst);
1175 fl6_sock_release(flowlabel);
1176 if (!err)
1177 return len;
1178 /*
1179 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
1180 * ENOBUFS might not be good (it's not tunable per se), but otherwise
1181 * we don't have a good statistic (IpOutDiscards but it can be too many
1182 * things). We could add another new stat but at least for now that
1183 * seems like overkill.
1184 */
1185 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
1186 UDP6_INC_STATS_USER(sock_net(sk),
1187 UDP_MIB_SNDBUFERRORS, is_udplite);
1188 }
1189 return err;
1190
1191 do_confirm:
1192 dst_confirm(dst);
1193 if (!(msg->msg_flags&MSG_PROBE) || len)
1194 goto back_from_confirm;
1195 err = 0;
1196 goto out;
1197 }
1198
1199 void udpv6_destroy_sock(struct sock *sk)
1200 {
1201 lock_sock(sk);
1202 udp_v6_flush_pending_frames(sk);
1203 release_sock(sk);
1204
1205 inet6_destroy_sock(sk);
1206 }
1207
1208 /*
1209 * Socket option code for UDP
1210 */
1211 int udpv6_setsockopt(struct sock *sk, int level, int optname,
1212 char __user *optval, unsigned int optlen)
1213 {
1214 if (level == SOL_UDP || level == SOL_UDPLITE)
1215 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1216 udp_v6_push_pending_frames);
1217 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1218 }
1219
1220 #ifdef CONFIG_COMPAT
1221 int compat_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 compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
1228 }
1229 #endif
1230
1231 int udpv6_getsockopt(struct sock *sk, int level, int optname,
1232 char __user *optval, int __user *optlen)
1233 {
1234 if (level == SOL_UDP || level == SOL_UDPLITE)
1235 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1236 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1237 }
1238
1239 #ifdef CONFIG_COMPAT
1240 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
1241 char __user *optval, int __user *optlen)
1242 {
1243 if (level == SOL_UDP || level == SOL_UDPLITE)
1244 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1245 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
1246 }
1247 #endif
1248
1249 static int udp6_ufo_send_check(struct sk_buff *skb)
1250 {
1251 struct ipv6hdr *ipv6h;
1252 struct udphdr *uh;
1253
1254 if (!pskb_may_pull(skb, sizeof(*uh)))
1255 return -EINVAL;
1256
1257 ipv6h = ipv6_hdr(skb);
1258 uh = udp_hdr(skb);
1259
1260 uh->check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr, skb->len,
1261 IPPROTO_UDP, 0);
1262 skb->csum_start = skb_transport_header(skb) - skb->head;
1263 skb->csum_offset = offsetof(struct udphdr, check);
1264 skb->ip_summed = CHECKSUM_PARTIAL;
1265 return 0;
1266 }
1267
1268 static struct sk_buff *udp6_ufo_fragment(struct sk_buff *skb, int features)
1269 {
1270 struct sk_buff *segs = ERR_PTR(-EINVAL);
1271 unsigned int mss;
1272 unsigned int unfrag_ip6hlen, unfrag_len;
1273 struct frag_hdr *fptr;
1274 u8 *mac_start, *prevhdr;
1275 u8 nexthdr;
1276 u8 frag_hdr_sz = sizeof(struct frag_hdr);
1277 int offset;
1278 __wsum csum;
1279
1280 mss = skb_shinfo(skb)->gso_size;
1281 if (unlikely(skb->len <= mss))
1282 goto out;
1283
1284 if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) {
1285 /* Packet is from an untrusted source, reset gso_segs. */
1286 int type = skb_shinfo(skb)->gso_type;
1287
1288 if (unlikely(type & ~(SKB_GSO_UDP | SKB_GSO_DODGY) ||
1289 !(type & (SKB_GSO_UDP))))
1290 goto out;
1291
1292 skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(skb->len, mss);
1293
1294 segs = NULL;
1295 goto out;
1296 }
1297
1298 /* Do software UFO. Complete and fill in the UDP checksum as HW cannot
1299 * do checksum of UDP packets sent as multiple IP fragments.
1300 */
1301 offset = skb->csum_start - skb_headroom(skb);
1302 csum = skb_checksum(skb, offset, skb->len- offset, 0);
1303 offset += skb->csum_offset;
1304 *(__sum16 *)(skb->data + offset) = csum_fold(csum);
1305 skb->ip_summed = CHECKSUM_NONE;
1306
1307 /* Check if there is enough headroom to insert fragment header. */
1308 if ((skb_headroom(skb) < frag_hdr_sz) &&
1309 pskb_expand_head(skb, frag_hdr_sz, 0, GFP_ATOMIC))
1310 goto out;
1311
1312 /* Find the unfragmentable header and shift it left by frag_hdr_sz
1313 * bytes to insert fragment header.
1314 */
1315 unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr);
1316 nexthdr = *prevhdr;
1317 *prevhdr = NEXTHDR_FRAGMENT;
1318 unfrag_len = skb_network_header(skb) - skb_mac_header(skb) +
1319 unfrag_ip6hlen;
1320 mac_start = skb_mac_header(skb);
1321 memmove(mac_start-frag_hdr_sz, mac_start, unfrag_len);
1322
1323 skb->mac_header -= frag_hdr_sz;
1324 skb->network_header -= frag_hdr_sz;
1325
1326 fptr = (struct frag_hdr *)(skb_network_header(skb) + unfrag_ip6hlen);
1327 fptr->nexthdr = nexthdr;
1328 fptr->reserved = 0;
1329 ipv6_select_ident(fptr);
1330
1331 /* Fragment the skb. ipv6 header and the remaining fields of the
1332 * fragment header are updated in ipv6_gso_segment()
1333 */
1334 segs = skb_segment(skb, features);
1335
1336 out:
1337 return segs;
1338 }
1339
1340 static const struct inet6_protocol udpv6_protocol = {
1341 .handler = udpv6_rcv,
1342 .err_handler = udpv6_err,
1343 .gso_send_check = udp6_ufo_send_check,
1344 .gso_segment = udp6_ufo_fragment,
1345 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1346 };
1347
1348 /* ------------------------------------------------------------------------ */
1349 #ifdef CONFIG_PROC_FS
1350
1351 static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket)
1352 {
1353 struct inet_sock *inet = inet_sk(sp);
1354 struct ipv6_pinfo *np = inet6_sk(sp);
1355 struct in6_addr *dest, *src;
1356 __u16 destp, srcp;
1357
1358 dest = &np->daddr;
1359 src = &np->rcv_saddr;
1360 destp = ntohs(inet->inet_dport);
1361 srcp = ntohs(inet->inet_sport);
1362 seq_printf(seq,
1363 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1364 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %d\n",
1365 bucket,
1366 src->s6_addr32[0], src->s6_addr32[1],
1367 src->s6_addr32[2], src->s6_addr32[3], srcp,
1368 dest->s6_addr32[0], dest->s6_addr32[1],
1369 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1370 sp->sk_state,
1371 sk_wmem_alloc_get(sp),
1372 sk_rmem_alloc_get(sp),
1373 0, 0L, 0,
1374 sock_i_uid(sp), 0,
1375 sock_i_ino(sp),
1376 atomic_read(&sp->sk_refcnt), sp,
1377 atomic_read(&sp->sk_drops));
1378 }
1379
1380 int udp6_seq_show(struct seq_file *seq, void *v)
1381 {
1382 if (v == SEQ_START_TOKEN)
1383 seq_printf(seq,
1384 " sl "
1385 "local_address "
1386 "remote_address "
1387 "st tx_queue rx_queue tr tm->when retrnsmt"
1388 " uid timeout inode ref pointer drops\n");
1389 else
1390 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket);
1391 return 0;
1392 }
1393
1394 static struct udp_seq_afinfo udp6_seq_afinfo = {
1395 .name = "udp6",
1396 .family = AF_INET6,
1397 .udp_table = &udp_table,
1398 .seq_fops = {
1399 .owner = THIS_MODULE,
1400 },
1401 .seq_ops = {
1402 .show = udp6_seq_show,
1403 },
1404 };
1405
1406 int __net_init udp6_proc_init(struct net *net)
1407 {
1408 return udp_proc_register(net, &udp6_seq_afinfo);
1409 }
1410
1411 void udp6_proc_exit(struct net *net) {
1412 udp_proc_unregister(net, &udp6_seq_afinfo);
1413 }
1414 #endif /* CONFIG_PROC_FS */
1415
1416 /* ------------------------------------------------------------------------ */
1417
1418 struct proto udpv6_prot = {
1419 .name = "UDPv6",
1420 .owner = THIS_MODULE,
1421 .close = udp_lib_close,
1422 .connect = ip6_datagram_connect,
1423 .disconnect = udp_disconnect,
1424 .ioctl = udp_ioctl,
1425 .destroy = udpv6_destroy_sock,
1426 .setsockopt = udpv6_setsockopt,
1427 .getsockopt = udpv6_getsockopt,
1428 .sendmsg = udpv6_sendmsg,
1429 .recvmsg = udpv6_recvmsg,
1430 .backlog_rcv = udpv6_queue_rcv_skb,
1431 .hash = udp_lib_hash,
1432 .unhash = udp_lib_unhash,
1433 .get_port = udp_v6_get_port,
1434 .memory_allocated = &udp_memory_allocated,
1435 .sysctl_mem = sysctl_udp_mem,
1436 .sysctl_wmem = &sysctl_udp_wmem_min,
1437 .sysctl_rmem = &sysctl_udp_rmem_min,
1438 .obj_size = sizeof(struct udp6_sock),
1439 .slab_flags = SLAB_DESTROY_BY_RCU,
1440 .h.udp_table = &udp_table,
1441 #ifdef CONFIG_COMPAT
1442 .compat_setsockopt = compat_udpv6_setsockopt,
1443 .compat_getsockopt = compat_udpv6_getsockopt,
1444 #endif
1445 };
1446
1447 static struct inet_protosw udpv6_protosw = {
1448 .type = SOCK_DGRAM,
1449 .protocol = IPPROTO_UDP,
1450 .prot = &udpv6_prot,
1451 .ops = &inet6_dgram_ops,
1452 .no_check = UDP_CSUM_DEFAULT,
1453 .flags = INET_PROTOSW_PERMANENT,
1454 };
1455
1456
1457 int __init udpv6_init(void)
1458 {
1459 int ret;
1460
1461 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
1462 if (ret)
1463 goto out;
1464
1465 ret = inet6_register_protosw(&udpv6_protosw);
1466 if (ret)
1467 goto out_udpv6_protocol;
1468 out:
1469 return ret;
1470
1471 out_udpv6_protocol:
1472 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1473 goto out;
1474 }
1475
1476 void udpv6_exit(void)
1477 {
1478 inet6_unregister_protosw(&udpv6_protosw);
1479 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1480 }
CJK support for tty framebuffer vt