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Merge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux
[zen-stable.git] / net / ipv6 / udp.c
blob8c25419151839cc2e7a8be6940de19d62a505690
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 = sk_rcv_saddr(sk);
58 __be32 sk2_rcv_saddr = sk_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 const struct in6_addr *saddr, __be16 sport,
126 const 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_hint(&result->sk_refcnt, 2)))
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 const struct in6_addr *saddr, __be16 sport,
243 const 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_hint(&result->sk_refcnt, 2)))
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 const 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 struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport,
324 const struct in6_addr *daddr, __be16 dport, int dif)
325 {
326 return __udp6_lib_lookup(net, saddr, sport, daddr, dport, dif, &udp_table);
327 }
328 EXPORT_SYMBOL_GPL(udp6_lib_lookup);
329
330
331 /*
332 * This should be easy, if there is something there we
333 * return it, otherwise we block.
334 */
335
336 int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
337 struct msghdr *msg, size_t len,
338 int noblock, int flags, int *addr_len)
339 {
340 struct ipv6_pinfo *np = inet6_sk(sk);
341 struct inet_sock *inet = inet_sk(sk);
342 struct sk_buff *skb;
343 unsigned int ulen, copied;
344 int peeked;
345 int err;
346 int is_udplite = IS_UDPLITE(sk);
347 int is_udp4;
348 bool slow;
349
350 if (addr_len)
351 *addr_len=sizeof(struct sockaddr_in6);
352
353 if (flags & MSG_ERRQUEUE)
354 return ipv6_recv_error(sk, msg, len);
355
356 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
357 return ipv6_recv_rxpmtu(sk, msg, len);
358
359 try_again:
360 skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),
361 &peeked, &err);
362 if (!skb)
363 goto out;
364
365 ulen = skb->len - sizeof(struct udphdr);
366 copied = len;
367 if (copied > ulen)
368 copied = ulen;
369 else if (copied < ulen)
370 msg->msg_flags |= MSG_TRUNC;
371
372 is_udp4 = (skb->protocol == htons(ETH_P_IP));
373
374 /*
375 * If checksum is needed at all, try to do it while copying the
376 * data. If the data is truncated, or if we only want a partial
377 * coverage checksum (UDP-Lite), do it before the copy.
378 */
379
380 if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) {
381 if (udp_lib_checksum_complete(skb))
382 goto csum_copy_err;
383 }
384
385 if (skb_csum_unnecessary(skb))
386 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr),
387 msg->msg_iov, copied );
388 else {
389 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
390 if (err == -EINVAL)
391 goto csum_copy_err;
392 }
393 if (err)
394 goto out_free;
395
396 if (!peeked) {
397 if (is_udp4)
398 UDP_INC_STATS_USER(sock_net(sk),
399 UDP_MIB_INDATAGRAMS, is_udplite);
400 else
401 UDP6_INC_STATS_USER(sock_net(sk),
402 UDP_MIB_INDATAGRAMS, is_udplite);
403 }
404
405 sock_recv_ts_and_drops(msg, sk, skb);
406
407 /* Copy the address. */
408 if (msg->msg_name) {
409 struct sockaddr_in6 *sin6;
410
411 sin6 = (struct sockaddr_in6 *) msg->msg_name;
412 sin6->sin6_family = AF_INET6;
413 sin6->sin6_port = udp_hdr(skb)->source;
414 sin6->sin6_flowinfo = 0;
415 sin6->sin6_scope_id = 0;
416
417 if (is_udp4)
418 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
419 &sin6->sin6_addr);
420 else {
421 ipv6_addr_copy(&sin6->sin6_addr,
422 &ipv6_hdr(skb)->saddr);
423 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
424 sin6->sin6_scope_id = IP6CB(skb)->iif;
425 }
426
427 }
428 if (is_udp4) {
429 if (inet->cmsg_flags)
430 ip_cmsg_recv(msg, skb);
431 } else {
432 if (np->rxopt.all)
433 datagram_recv_ctl(sk, msg, skb);
434 }
435
436 err = copied;
437 if (flags & MSG_TRUNC)
438 err = ulen;
439
440 out_free:
441 skb_free_datagram_locked(sk, skb);
442 out:
443 return err;
444
445 csum_copy_err:
446 slow = lock_sock_fast(sk);
447 if (!skb_kill_datagram(sk, skb, flags)) {
448 if (is_udp4)
449 UDP_INC_STATS_USER(sock_net(sk),
450 UDP_MIB_INERRORS, is_udplite);
451 else
452 UDP6_INC_STATS_USER(sock_net(sk),
453 UDP_MIB_INERRORS, is_udplite);
454 }
455 unlock_sock_fast(sk, slow);
456
457 if (noblock)
458 return -EAGAIN;
459
460 /* starting over for a new packet */
461 msg->msg_flags &= ~MSG_TRUNC;
462 goto try_again;
463 }
464
465 void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
466 u8 type, u8 code, int offset, __be32 info,
467 struct udp_table *udptable)
468 {
469 struct ipv6_pinfo *np;
470 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
471 const struct in6_addr *saddr = &hdr->saddr;
472 const struct in6_addr *daddr = &hdr->daddr;
473 struct udphdr *uh = (struct udphdr*)(skb->data+offset);
474 struct sock *sk;
475 int err;
476
477 sk = __udp6_lib_lookup(dev_net(skb->dev), daddr, uh->dest,
478 saddr, uh->source, inet6_iif(skb), udptable);
479 if (sk == NULL)
480 return;
481
482 np = inet6_sk(sk);
483
484 if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
485 goto out;
486
487 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
488 goto out;
489
490 if (np->recverr)
491 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
492
493 sk->sk_err = err;
494 sk->sk_error_report(sk);
495 out:
496 sock_put(sk);
497 }
498
499 static __inline__ void udpv6_err(struct sk_buff *skb,
500 struct inet6_skb_parm *opt, u8 type,
501 u8 code, int offset, __be32 info )
502 {
503 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table);
504 }
505
506 int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
507 {
508 struct udp_sock *up = udp_sk(sk);
509 int rc;
510 int is_udplite = IS_UDPLITE(sk);
511
512 if (!ipv6_addr_any(&inet6_sk(sk)->daddr))
513 sock_rps_save_rxhash(sk, skb);
514
515 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
516 goto drop;
517
518 /*
519 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
520 */
521 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
522
523 if (up->pcrlen == 0) { /* full coverage was set */
524 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage"
525 " %d while full coverage %d requested\n",
526 UDP_SKB_CB(skb)->cscov, skb->len);
527 goto drop;
528 }
529 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
530 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d "
531 "too small, need min %d\n",
532 UDP_SKB_CB(skb)->cscov, up->pcrlen);
533 goto drop;
534 }
535 }
536
537 if (rcu_access_pointer(sk->sk_filter)) {
538 if (udp_lib_checksum_complete(skb))
539 goto drop;
540 }
541
542 if ((rc = ip_queue_rcv_skb(sk, skb)) < 0) {
543 /* Note that an ENOMEM error is charged twice */
544 if (rc == -ENOMEM)
545 UDP6_INC_STATS_BH(sock_net(sk),
546 UDP_MIB_RCVBUFERRORS, is_udplite);
547 goto drop_no_sk_drops_inc;
548 }
549
550 return 0;
551 drop:
552 atomic_inc(&sk->sk_drops);
553 drop_no_sk_drops_inc:
554 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
555 kfree_skb(skb);
556 return -1;
557 }
558
559 static struct sock *udp_v6_mcast_next(struct net *net, struct sock *sk,
560 __be16 loc_port, const struct in6_addr *loc_addr,
561 __be16 rmt_port, const struct in6_addr *rmt_addr,
562 int dif)
563 {
564 struct hlist_nulls_node *node;
565 struct sock *s = sk;
566 unsigned short num = ntohs(loc_port);
567
568 sk_nulls_for_each_from(s, node) {
569 struct inet_sock *inet = inet_sk(s);
570
571 if (!net_eq(sock_net(s), net))
572 continue;
573
574 if (udp_sk(s)->udp_port_hash == num &&
575 s->sk_family == PF_INET6) {
576 struct ipv6_pinfo *np = inet6_sk(s);
577 if (inet->inet_dport) {
578 if (inet->inet_dport != rmt_port)
579 continue;
580 }
581 if (!ipv6_addr_any(&np->daddr) &&
582 !ipv6_addr_equal(&np->daddr, rmt_addr))
583 continue;
584
585 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)
586 continue;
587
588 if (!ipv6_addr_any(&np->rcv_saddr)) {
589 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr))
590 continue;
591 }
592 if (!inet6_mc_check(s, loc_addr, rmt_addr))
593 continue;
594 return s;
595 }
596 }
597 return NULL;
598 }
599
600 static void flush_stack(struct sock **stack, unsigned int count,
601 struct sk_buff *skb, unsigned int final)
602 {
603 unsigned int i;
604 struct sock *sk;
605 struct sk_buff *skb1;
606
607 for (i = 0; i < count; i++) {
608 skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC);
609
610 sk = stack[i];
611 if (skb1) {
612 if (sk_rcvqueues_full(sk, skb1)) {
613 kfree_skb(skb1);
614 goto drop;
615 }
616 bh_lock_sock(sk);
617 if (!sock_owned_by_user(sk))
618 udpv6_queue_rcv_skb(sk, skb1);
619 else if (sk_add_backlog(sk, skb1)) {
620 kfree_skb(skb1);
621 bh_unlock_sock(sk);
622 goto drop;
623 }
624 bh_unlock_sock(sk);
625 continue;
626 }
627 drop:
628 atomic_inc(&sk->sk_drops);
629 UDP6_INC_STATS_BH(sock_net(sk),
630 UDP_MIB_RCVBUFERRORS, IS_UDPLITE(sk));
631 UDP6_INC_STATS_BH(sock_net(sk),
632 UDP_MIB_INERRORS, IS_UDPLITE(sk));
633 }
634 }
635 /*
636 * Note: called only from the BH handler context,
637 * so we don't need to lock the hashes.
638 */
639 static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
640 const struct in6_addr *saddr, const struct in6_addr *daddr,
641 struct udp_table *udptable)
642 {
643 struct sock *sk, *stack[256 / sizeof(struct sock *)];
644 const struct udphdr *uh = udp_hdr(skb);
645 struct udp_hslot *hslot = udp_hashslot(udptable, net, ntohs(uh->dest));
646 int dif;
647 unsigned int i, count = 0;
648
649 spin_lock(&hslot->lock);
650 sk = sk_nulls_head(&hslot->head);
651 dif = inet6_iif(skb);
652 sk = udp_v6_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif);
653 while (sk) {
654 stack[count++] = sk;
655 sk = udp_v6_mcast_next(net, sk_nulls_next(sk), uh->dest, daddr,
656 uh->source, saddr, dif);
657 if (unlikely(count == ARRAY_SIZE(stack))) {
658 if (!sk)
659 break;
660 flush_stack(stack, count, skb, ~0);
661 count = 0;
662 }
663 }
664 /*
665 * before releasing the lock, we must take reference on sockets
666 */
667 for (i = 0; i < count; i++)
668 sock_hold(stack[i]);
669
670 spin_unlock(&hslot->lock);
671
672 if (count) {
673 flush_stack(stack, count, skb, count - 1);
674
675 for (i = 0; i < count; i++)
676 sock_put(stack[i]);
677 } else {
678 kfree_skb(skb);
679 }
680 return 0;
681 }
682
683 static inline int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh,
684 int proto)
685 {
686 int err;
687
688 UDP_SKB_CB(skb)->partial_cov = 0;
689 UDP_SKB_CB(skb)->cscov = skb->len;
690
691 if (proto == IPPROTO_UDPLITE) {
692 err = udplite_checksum_init(skb, uh);
693 if (err)
694 return err;
695 }
696
697 if (uh->check == 0) {
698 /* RFC 2460 section 8.1 says that we SHOULD log
699 this error. Well, it is reasonable.
700 */
701 LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n");
702 return 1;
703 }
704 if (skb->ip_summed == CHECKSUM_COMPLETE &&
705 !csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
706 skb->len, proto, skb->csum))
707 skb->ip_summed = CHECKSUM_UNNECESSARY;
708
709 if (!skb_csum_unnecessary(skb))
710 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
711 &ipv6_hdr(skb)->daddr,
712 skb->len, proto, 0));
713
714 return 0;
715 }
716
717 int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
718 int proto)
719 {
720 struct net *net = dev_net(skb->dev);
721 struct sock *sk;
722 struct udphdr *uh;
723 const struct in6_addr *saddr, *daddr;
724 u32 ulen = 0;
725
726 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
727 goto discard;
728
729 saddr = &ipv6_hdr(skb)->saddr;
730 daddr = &ipv6_hdr(skb)->daddr;
731 uh = udp_hdr(skb);
732
733 ulen = ntohs(uh->len);
734 if (ulen > skb->len)
735 goto short_packet;
736
737 if (proto == IPPROTO_UDP) {
738 /* UDP validates ulen. */
739
740 /* Check for jumbo payload */
741 if (ulen == 0)
742 ulen = skb->len;
743
744 if (ulen < sizeof(*uh))
745 goto short_packet;
746
747 if (ulen < skb->len) {
748 if (pskb_trim_rcsum(skb, ulen))
749 goto short_packet;
750 saddr = &ipv6_hdr(skb)->saddr;
751 daddr = &ipv6_hdr(skb)->daddr;
752 uh = udp_hdr(skb);
753 }
754 }
755
756 if (udp6_csum_init(skb, uh, proto))
757 goto discard;
758
759 /*
760 * Multicast receive code
761 */
762 if (ipv6_addr_is_multicast(daddr))
763 return __udp6_lib_mcast_deliver(net, skb,
764 saddr, daddr, udptable);
765
766 /* Unicast */
767
768 /*
769 * check socket cache ... must talk to Alan about his plans
770 * for sock caches... i'll skip this for now.
771 */
772 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
773
774 if (sk == NULL) {
775 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
776 goto discard;
777
778 if (udp_lib_checksum_complete(skb))
779 goto discard;
780 UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS,
781 proto == IPPROTO_UDPLITE);
782
783 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
784
785 kfree_skb(skb);
786 return 0;
787 }
788
789 /* deliver */
790
791 if (sk_rcvqueues_full(sk, skb)) {
792 sock_put(sk);
793 goto discard;
794 }
795 bh_lock_sock(sk);
796 if (!sock_owned_by_user(sk))
797 udpv6_queue_rcv_skb(sk, skb);
798 else if (sk_add_backlog(sk, skb)) {
799 atomic_inc(&sk->sk_drops);
800 bh_unlock_sock(sk);
801 sock_put(sk);
802 goto discard;
803 }
804 bh_unlock_sock(sk);
805 sock_put(sk);
806 return 0;
807
808 short_packet:
809 LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n",
810 proto == IPPROTO_UDPLITE ? "-Lite" : "",
811 saddr,
812 ntohs(uh->source),
813 ulen,
814 skb->len,
815 daddr,
816 ntohs(uh->dest));
817
818 discard:
819 UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
820 kfree_skb(skb);
821 return 0;
822 }
823
824 static __inline__ int udpv6_rcv(struct sk_buff *skb)
825 {
826 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP);
827 }
828
829 /*
830 * Throw away all pending data and cancel the corking. Socket is locked.
831 */
832 static void udp_v6_flush_pending_frames(struct sock *sk)
833 {
834 struct udp_sock *up = udp_sk(sk);
835
836 if (up->pending == AF_INET)
837 udp_flush_pending_frames(sk);
838 else if (up->pending) {
839 up->len = 0;
840 up->pending = 0;
841 ip6_flush_pending_frames(sk);
842 }
843 }
844
845 /**
846 * udp6_hwcsum_outgoing - handle outgoing HW checksumming
847 * @sk: socket we are sending on
848 * @skb: sk_buff containing the filled-in UDP header
849 * (checksum field must be zeroed out)
850 */
851 static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
852 const struct in6_addr *saddr,
853 const struct in6_addr *daddr, int len)
854 {
855 unsigned int offset;
856 struct udphdr *uh = udp_hdr(skb);
857 __wsum csum = 0;
858
859 if (skb_queue_len(&sk->sk_write_queue) == 1) {
860 /* Only one fragment on the socket. */
861 skb->csum_start = skb_transport_header(skb) - skb->head;
862 skb->csum_offset = offsetof(struct udphdr, check);
863 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0);
864 } else {
865 /*
866 * HW-checksum won't work as there are two or more
867 * fragments on the socket so that all csums of sk_buffs
868 * should be together
869 */
870 offset = skb_transport_offset(skb);
871 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
872
873 skb->ip_summed = CHECKSUM_NONE;
874
875 skb_queue_walk(&sk->sk_write_queue, skb) {
876 csum = csum_add(csum, skb->csum);
877 }
878
879 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP,
880 csum);
881 if (uh->check == 0)
882 uh->check = CSUM_MANGLED_0;
883 }
884 }
885
886 /*
887 * Sending
888 */
889
890 static int udp_v6_push_pending_frames(struct sock *sk)
891 {
892 struct sk_buff *skb;
893 struct udphdr *uh;
894 struct udp_sock *up = udp_sk(sk);
895 struct inet_sock *inet = inet_sk(sk);
896 struct flowi6 *fl6 = &inet->cork.fl.u.ip6;
897 int err = 0;
898 int is_udplite = IS_UDPLITE(sk);
899 __wsum csum = 0;
900
901 /* Grab the skbuff where UDP header space exists. */
902 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
903 goto out;
904
905 /*
906 * Create a UDP header
907 */
908 uh = udp_hdr(skb);
909 uh->source = fl6->fl6_sport;
910 uh->dest = fl6->fl6_dport;
911 uh->len = htons(up->len);
912 uh->check = 0;
913
914 if (is_udplite)
915 csum = udplite_csum_outgoing(sk, skb);
916 else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
917 udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr,
918 up->len);
919 goto send;
920 } else
921 csum = udp_csum_outgoing(sk, skb);
922
923 /* add protocol-dependent pseudo-header */
924 uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
925 up->len, fl6->flowi6_proto, csum);
926 if (uh->check == 0)
927 uh->check = CSUM_MANGLED_0;
928
929 send:
930 err = ip6_push_pending_frames(sk);
931 if (err) {
932 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) {
933 UDP6_INC_STATS_USER(sock_net(sk),
934 UDP_MIB_SNDBUFERRORS, is_udplite);
935 err = 0;
936 }
937 } else
938 UDP6_INC_STATS_USER(sock_net(sk),
939 UDP_MIB_OUTDATAGRAMS, is_udplite);
940 out:
941 up->len = 0;
942 up->pending = 0;
943 return err;
944 }
945
946 int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
947 struct msghdr *msg, size_t len)
948 {
949 struct ipv6_txoptions opt_space;
950 struct udp_sock *up = udp_sk(sk);
951 struct inet_sock *inet = inet_sk(sk);
952 struct ipv6_pinfo *np = inet6_sk(sk);
953 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
954 struct in6_addr *daddr, *final_p, final;
955 struct ipv6_txoptions *opt = NULL;
956 struct ip6_flowlabel *flowlabel = NULL;
957 struct flowi6 fl6;
958 struct dst_entry *dst;
959 int addr_len = msg->msg_namelen;
960 int ulen = len;
961 int hlimit = -1;
962 int tclass = -1;
963 int dontfrag = -1;
964 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
965 int err;
966 int connected = 0;
967 int is_udplite = IS_UDPLITE(sk);
968 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
969
970 /* destination address check */
971 if (sin6) {
972 if (addr_len < offsetof(struct sockaddr, sa_data))
973 return -EINVAL;
974
975 switch (sin6->sin6_family) {
976 case AF_INET6:
977 if (addr_len < SIN6_LEN_RFC2133)
978 return -EINVAL;
979 daddr = &sin6->sin6_addr;
980 break;
981 case AF_INET:
982 goto do_udp_sendmsg;
983 case AF_UNSPEC:
984 msg->msg_name = sin6 = NULL;
985 msg->msg_namelen = addr_len = 0;
986 daddr = NULL;
987 break;
988 default:
989 return -EINVAL;
990 }
991 } else if (!up->pending) {
992 if (sk->sk_state != TCP_ESTABLISHED)
993 return -EDESTADDRREQ;
994 daddr = &np->daddr;
995 } else
996 daddr = NULL;
997
998 if (daddr) {
999 if (ipv6_addr_v4mapped(daddr)) {
1000 struct sockaddr_in sin;
1001 sin.sin_family = AF_INET;
1002 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport;
1003 sin.sin_addr.s_addr = daddr->s6_addr32[3];
1004 msg->msg_name = &sin;
1005 msg->msg_namelen = sizeof(sin);
1006 do_udp_sendmsg:
1007 if (__ipv6_only_sock(sk))
1008 return -ENETUNREACH;
1009 return udp_sendmsg(iocb, sk, msg, len);
1010 }
1011 }
1012
1013 if (up->pending == AF_INET)
1014 return udp_sendmsg(iocb, sk, msg, len);
1015
1016 /* Rough check on arithmetic overflow,
1017 better check is made in ip6_append_data().
1018 */
1019 if (len > INT_MAX - sizeof(struct udphdr))
1020 return -EMSGSIZE;
1021
1022 if (up->pending) {
1023 /*
1024 * There are pending frames.
1025 * The socket lock must be held while it's corked.
1026 */
1027 lock_sock(sk);
1028 if (likely(up->pending)) {
1029 if (unlikely(up->pending != AF_INET6)) {
1030 release_sock(sk);
1031 return -EAFNOSUPPORT;
1032 }
1033 dst = NULL;
1034 goto do_append_data;
1035 }
1036 release_sock(sk);
1037 }
1038 ulen += sizeof(struct udphdr);
1039
1040 memset(&fl6, 0, sizeof(fl6));
1041
1042 if (sin6) {
1043 if (sin6->sin6_port == 0)
1044 return -EINVAL;
1045
1046 fl6.fl6_dport = sin6->sin6_port;
1047 daddr = &sin6->sin6_addr;
1048
1049 if (np->sndflow) {
1050 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
1051 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
1052 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1053 if (flowlabel == NULL)
1054 return -EINVAL;
1055 daddr = &flowlabel->dst;
1056 }
1057 }
1058
1059 /*
1060 * Otherwise it will be difficult to maintain
1061 * sk->sk_dst_cache.
1062 */
1063 if (sk->sk_state == TCP_ESTABLISHED &&
1064 ipv6_addr_equal(daddr, &np->daddr))
1065 daddr = &np->daddr;
1066
1067 if (addr_len >= sizeof(struct sockaddr_in6) &&
1068 sin6->sin6_scope_id &&
1069 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
1070 fl6.flowi6_oif = sin6->sin6_scope_id;
1071 } else {
1072 if (sk->sk_state != TCP_ESTABLISHED)
1073 return -EDESTADDRREQ;
1074
1075 fl6.fl6_dport = inet->inet_dport;
1076 daddr = &np->daddr;
1077 fl6.flowlabel = np->flow_label;
1078 connected = 1;
1079 }
1080
1081 if (!fl6.flowi6_oif)
1082 fl6.flowi6_oif = sk->sk_bound_dev_if;
1083
1084 if (!fl6.flowi6_oif)
1085 fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex;
1086
1087 fl6.flowi6_mark = sk->sk_mark;
1088
1089 if (msg->msg_controllen) {
1090 opt = &opt_space;
1091 memset(opt, 0, sizeof(struct ipv6_txoptions));
1092 opt->tot_len = sizeof(*opt);
1093
1094 err = datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt,
1095 &hlimit, &tclass, &dontfrag);
1096 if (err < 0) {
1097 fl6_sock_release(flowlabel);
1098 return err;
1099 }
1100 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
1101 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1102 if (flowlabel == NULL)
1103 return -EINVAL;
1104 }
1105 if (!(opt->opt_nflen|opt->opt_flen))
1106 opt = NULL;
1107 connected = 0;
1108 }
1109 if (opt == NULL)
1110 opt = np->opt;
1111 if (flowlabel)
1112 opt = fl6_merge_options(&opt_space, flowlabel, opt);
1113 opt = ipv6_fixup_options(&opt_space, opt);
1114
1115 fl6.flowi6_proto = sk->sk_protocol;
1116 if (!ipv6_addr_any(daddr))
1117 ipv6_addr_copy(&fl6.daddr, daddr);
1118 else
1119 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
1120 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
1121 ipv6_addr_copy(&fl6.saddr, &np->saddr);
1122 fl6.fl6_sport = inet->inet_sport;
1123
1124 final_p = fl6_update_dst(&fl6, opt, &final);
1125 if (final_p)
1126 connected = 0;
1127
1128 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) {
1129 fl6.flowi6_oif = np->mcast_oif;
1130 connected = 0;
1131 }
1132
1133 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
1134
1135 dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p, true);
1136 if (IS_ERR(dst)) {
1137 err = PTR_ERR(dst);
1138 dst = NULL;
1139 goto out;
1140 }
1141
1142 if (hlimit < 0) {
1143 if (ipv6_addr_is_multicast(&fl6.daddr))
1144 hlimit = np->mcast_hops;
1145 else
1146 hlimit = np->hop_limit;
1147 if (hlimit < 0)
1148 hlimit = ip6_dst_hoplimit(dst);
1149 }
1150
1151 if (tclass < 0)
1152 tclass = np->tclass;
1153
1154 if (dontfrag < 0)
1155 dontfrag = np->dontfrag;
1156
1157 if (msg->msg_flags&MSG_CONFIRM)
1158 goto do_confirm;
1159 back_from_confirm:
1160
1161 lock_sock(sk);
1162 if (unlikely(up->pending)) {
1163 /* The socket is already corked while preparing it. */
1164 /* ... which is an evident application bug. --ANK */
1165 release_sock(sk);
1166
1167 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
1168 err = -EINVAL;
1169 goto out;
1170 }
1171
1172 up->pending = AF_INET6;
1173
1174 do_append_data:
1175 up->len += ulen;
1176 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
1177 err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen,
1178 sizeof(struct udphdr), hlimit, tclass, opt, &fl6,
1179 (struct rt6_info*)dst,
1180 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, dontfrag);
1181 if (err)
1182 udp_v6_flush_pending_frames(sk);
1183 else if (!corkreq)
1184 err = udp_v6_push_pending_frames(sk);
1185 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
1186 up->pending = 0;
1187
1188 if (dst) {
1189 if (connected) {
1190 ip6_dst_store(sk, dst,
1191 ipv6_addr_equal(&fl6.daddr, &np->daddr) ?
1192 &np->daddr : NULL,
1193 #ifdef CONFIG_IPV6_SUBTREES
1194 ipv6_addr_equal(&fl6.saddr, &np->saddr) ?
1195 &np->saddr :
1196 #endif
1197 NULL);
1198 } else {
1199 dst_release(dst);
1200 }
1201 dst = NULL;
1202 }
1203
1204 if (err > 0)
1205 err = np->recverr ? net_xmit_errno(err) : 0;
1206 release_sock(sk);
1207 out:
1208 dst_release(dst);
1209 fl6_sock_release(flowlabel);
1210 if (!err)
1211 return len;
1212 /*
1213 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
1214 * ENOBUFS might not be good (it's not tunable per se), but otherwise
1215 * we don't have a good statistic (IpOutDiscards but it can be too many
1216 * things). We could add another new stat but at least for now that
1217 * seems like overkill.
1218 */
1219 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
1220 UDP6_INC_STATS_USER(sock_net(sk),
1221 UDP_MIB_SNDBUFERRORS, is_udplite);
1222 }
1223 return err;
1224
1225 do_confirm:
1226 dst_confirm(dst);
1227 if (!(msg->msg_flags&MSG_PROBE) || len)
1228 goto back_from_confirm;
1229 err = 0;
1230 goto out;
1231 }
1232
1233 void udpv6_destroy_sock(struct sock *sk)
1234 {
1235 lock_sock(sk);
1236 udp_v6_flush_pending_frames(sk);
1237 release_sock(sk);
1238
1239 inet6_destroy_sock(sk);
1240 }
1241
1242 /*
1243 * Socket option code for UDP
1244 */
1245 int udpv6_setsockopt(struct sock *sk, int level, int optname,
1246 char __user *optval, unsigned int optlen)
1247 {
1248 if (level == SOL_UDP || level == SOL_UDPLITE)
1249 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1250 udp_v6_push_pending_frames);
1251 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1252 }
1253
1254 #ifdef CONFIG_COMPAT
1255 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
1256 char __user *optval, unsigned int optlen)
1257 {
1258 if (level == SOL_UDP || level == SOL_UDPLITE)
1259 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1260 udp_v6_push_pending_frames);
1261 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
1262 }
1263 #endif
1264
1265 int udpv6_getsockopt(struct sock *sk, int level, int optname,
1266 char __user *optval, int __user *optlen)
1267 {
1268 if (level == SOL_UDP || level == SOL_UDPLITE)
1269 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1270 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1271 }
1272
1273 #ifdef CONFIG_COMPAT
1274 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
1275 char __user *optval, int __user *optlen)
1276 {
1277 if (level == SOL_UDP || level == SOL_UDPLITE)
1278 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1279 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
1280 }
1281 #endif
1282
1283 static int udp6_ufo_send_check(struct sk_buff *skb)
1284 {
1285 const struct ipv6hdr *ipv6h;
1286 struct udphdr *uh;
1287
1288 if (!pskb_may_pull(skb, sizeof(*uh)))
1289 return -EINVAL;
1290
1291 ipv6h = ipv6_hdr(skb);
1292 uh = udp_hdr(skb);
1293
1294 uh->check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr, skb->len,
1295 IPPROTO_UDP, 0);
1296 skb->csum_start = skb_transport_header(skb) - skb->head;
1297 skb->csum_offset = offsetof(struct udphdr, check);
1298 skb->ip_summed = CHECKSUM_PARTIAL;
1299 return 0;
1300 }
1301
1302 static struct sk_buff *udp6_ufo_fragment(struct sk_buff *skb, u32 features)
1303 {
1304 struct sk_buff *segs = ERR_PTR(-EINVAL);
1305 unsigned int mss;
1306 unsigned int unfrag_ip6hlen, unfrag_len;
1307 struct frag_hdr *fptr;
1308 u8 *mac_start, *prevhdr;
1309 u8 nexthdr;
1310 u8 frag_hdr_sz = sizeof(struct frag_hdr);
1311 int offset;
1312 __wsum csum;
1313
1314 mss = skb_shinfo(skb)->gso_size;
1315 if (unlikely(skb->len <= mss))
1316 goto out;
1317
1318 if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) {
1319 /* Packet is from an untrusted source, reset gso_segs. */
1320 int type = skb_shinfo(skb)->gso_type;
1321
1322 if (unlikely(type & ~(SKB_GSO_UDP | SKB_GSO_DODGY) ||
1323 !(type & (SKB_GSO_UDP))))
1324 goto out;
1325
1326 skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(skb->len, mss);
1327
1328 segs = NULL;
1329 goto out;
1330 }
1331
1332 /* Do software UFO. Complete and fill in the UDP checksum as HW cannot
1333 * do checksum of UDP packets sent as multiple IP fragments.
1334 */
1335 offset = skb_checksum_start_offset(skb);
1336 csum = skb_checksum(skb, offset, skb->len- offset, 0);
1337 offset += skb->csum_offset;
1338 *(__sum16 *)(skb->data + offset) = csum_fold(csum);
1339 skb->ip_summed = CHECKSUM_NONE;
1340
1341 /* Check if there is enough headroom to insert fragment header. */
1342 if ((skb_mac_header(skb) < skb->head + frag_hdr_sz) &&
1343 pskb_expand_head(skb, frag_hdr_sz, 0, GFP_ATOMIC))
1344 goto out;
1345
1346 /* Find the unfragmentable header and shift it left by frag_hdr_sz
1347 * bytes to insert fragment header.
1348 */
1349 unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr);
1350 nexthdr = *prevhdr;
1351 *prevhdr = NEXTHDR_FRAGMENT;
1352 unfrag_len = skb_network_header(skb) - skb_mac_header(skb) +
1353 unfrag_ip6hlen;
1354 mac_start = skb_mac_header(skb);
1355 memmove(mac_start-frag_hdr_sz, mac_start, unfrag_len);
1356
1357 skb->mac_header -= frag_hdr_sz;
1358 skb->network_header -= frag_hdr_sz;
1359
1360 fptr = (struct frag_hdr *)(skb_network_header(skb) + unfrag_ip6hlen);
1361 fptr->nexthdr = nexthdr;
1362 fptr->reserved = 0;
1363 ipv6_select_ident(fptr, (struct rt6_info *)skb_dst(skb));
1364
1365 /* Fragment the skb. ipv6 header and the remaining fields of the
1366 * fragment header are updated in ipv6_gso_segment()
1367 */
1368 segs = skb_segment(skb, features);
1369
1370 out:
1371 return segs;
1372 }
1373
1374 static const struct inet6_protocol udpv6_protocol = {
1375 .handler = udpv6_rcv,
1376 .err_handler = udpv6_err,
1377 .gso_send_check = udp6_ufo_send_check,
1378 .gso_segment = udp6_ufo_fragment,
1379 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1380 };
1381
1382 /* ------------------------------------------------------------------------ */
1383 #ifdef CONFIG_PROC_FS
1384
1385 static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket)
1386 {
1387 struct inet_sock *inet = inet_sk(sp);
1388 struct ipv6_pinfo *np = inet6_sk(sp);
1389 const struct in6_addr *dest, *src;
1390 __u16 destp, srcp;
1391
1392 dest = &np->daddr;
1393 src = &np->rcv_saddr;
1394 destp = ntohs(inet->inet_dport);
1395 srcp = ntohs(inet->inet_sport);
1396 seq_printf(seq,
1397 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1398 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %d\n",
1399 bucket,
1400 src->s6_addr32[0], src->s6_addr32[1],
1401 src->s6_addr32[2], src->s6_addr32[3], srcp,
1402 dest->s6_addr32[0], dest->s6_addr32[1],
1403 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1404 sp->sk_state,
1405 sk_wmem_alloc_get(sp),
1406 sk_rmem_alloc_get(sp),
1407 0, 0L, 0,
1408 sock_i_uid(sp), 0,
1409 sock_i_ino(sp),
1410 atomic_read(&sp->sk_refcnt), sp,
1411 atomic_read(&sp->sk_drops));
1412 }
1413
1414 int udp6_seq_show(struct seq_file *seq, void *v)
1415 {
1416 if (v == SEQ_START_TOKEN)
1417 seq_printf(seq,
1418 " sl "
1419 "local_address "
1420 "remote_address "
1421 "st tx_queue rx_queue tr tm->when retrnsmt"
1422 " uid timeout inode ref pointer drops\n");
1423 else
1424 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket);
1425 return 0;
1426 }
1427
1428 static const struct file_operations udp6_afinfo_seq_fops = {
1429 .owner = THIS_MODULE,
1430 .open = udp_seq_open,
1431 .read = seq_read,
1432 .llseek = seq_lseek,
1433 .release = seq_release_net
1434 };
1435
1436 static struct udp_seq_afinfo udp6_seq_afinfo = {
1437 .name = "udp6",
1438 .family = AF_INET6,
1439 .udp_table = &udp_table,
1440 .seq_fops = &udp6_afinfo_seq_fops,
1441 .seq_ops = {
1442 .show = udp6_seq_show,
1443 },
1444 };
1445
1446 int __net_init udp6_proc_init(struct net *net)
1447 {
1448 return udp_proc_register(net, &udp6_seq_afinfo);
1449 }
1450
1451 void udp6_proc_exit(struct net *net) {
1452 udp_proc_unregister(net, &udp6_seq_afinfo);
1453 }
1454 #endif /* CONFIG_PROC_FS */
1455
1456 /* ------------------------------------------------------------------------ */
1457
1458 struct proto udpv6_prot = {
1459 .name = "UDPv6",
1460 .owner = THIS_MODULE,
1461 .close = udp_lib_close,
1462 .connect = ip6_datagram_connect,
1463 .disconnect = udp_disconnect,
1464 .ioctl = udp_ioctl,
1465 .destroy = udpv6_destroy_sock,
1466 .setsockopt = udpv6_setsockopt,
1467 .getsockopt = udpv6_getsockopt,
1468 .sendmsg = udpv6_sendmsg,
1469 .recvmsg = udpv6_recvmsg,
1470 .backlog_rcv = udpv6_queue_rcv_skb,
1471 .hash = udp_lib_hash,
1472 .unhash = udp_lib_unhash,
1473 .rehash = udp_v6_rehash,
1474 .get_port = udp_v6_get_port,
1475 .memory_allocated = &udp_memory_allocated,
1476 .sysctl_mem = sysctl_udp_mem,
1477 .sysctl_wmem = &sysctl_udp_wmem_min,
1478 .sysctl_rmem = &sysctl_udp_rmem_min,
1479 .obj_size = sizeof(struct udp6_sock),
1480 .slab_flags = SLAB_DESTROY_BY_RCU,
1481 .h.udp_table = &udp_table,
1482 #ifdef CONFIG_COMPAT
1483 .compat_setsockopt = compat_udpv6_setsockopt,
1484 .compat_getsockopt = compat_udpv6_getsockopt,
1485 #endif
1486 .clear_sk = sk_prot_clear_portaddr_nulls,
1487 };
1488
1489 static struct inet_protosw udpv6_protosw = {
1490 .type = SOCK_DGRAM,
1491 .protocol = IPPROTO_UDP,
1492 .prot = &udpv6_prot,
1493 .ops = &inet6_dgram_ops,
1494 .no_check = UDP_CSUM_DEFAULT,
1495 .flags = INET_PROTOSW_PERMANENT,
1496 };
1497
1498
1499 int __init udpv6_init(void)
1500 {
1501 int ret;
1502
1503 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
1504 if (ret)
1505 goto out;
1506
1507 ret = inet6_register_protosw(&udpv6_protosw);
1508 if (ret)
1509 goto out_udpv6_protocol;
1510 out:
1511 return ret;
1512
1513 out_udpv6_protocol:
1514 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1515 goto out;
1516 }
1517
1518 void udpv6_exit(void)
1519 {
1520 inet6_unregister_protosw(&udpv6_protosw);
1521 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1522 }