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Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux-2.6.git] / net / ipv6 / udp.c
blob18786098fd412dd5fa95a9fc096195f387b53fa0
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 #include <net/inet6_hashtables.h>
49 #include <net/busy_poll.h>
50
51 #include <linux/proc_fs.h>
52 #include <linux/seq_file.h>
53 #include <trace/events/skb.h>
54 #include "udp_impl.h"
55
56 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
57 {
58 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
59 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
60 __be32 sk1_rcv_saddr = sk_rcv_saddr(sk);
61 __be32 sk2_rcv_saddr = sk_rcv_saddr(sk2);
62 int sk_ipv6only = ipv6_only_sock(sk);
63 int sk2_ipv6only = inet_v6_ipv6only(sk2);
64 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
65 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
66
67 /* if both are mapped, treat as IPv4 */
68 if (addr_type == IPV6_ADDR_MAPPED && addr_type2 == IPV6_ADDR_MAPPED)
69 return (!sk2_ipv6only &&
70 (!sk1_rcv_saddr || !sk2_rcv_saddr ||
71 sk1_rcv_saddr == sk2_rcv_saddr));
72
73 if (addr_type2 == IPV6_ADDR_ANY &&
74 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
75 return 1;
76
77 if (addr_type == IPV6_ADDR_ANY &&
78 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
79 return 1;
80
81 if (sk2_rcv_saddr6 &&
82 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
83 return 1;
84
85 return 0;
86 }
87
88 static unsigned int udp6_portaddr_hash(struct net *net,
89 const struct in6_addr *addr6,
90 unsigned int port)
91 {
92 unsigned int hash, mix = net_hash_mix(net);
93
94 if (ipv6_addr_any(addr6))
95 hash = jhash_1word(0, mix);
96 else if (ipv6_addr_v4mapped(addr6))
97 hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix);
98 else
99 hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix);
100
101 return hash ^ port;
102 }
103
104
105 int udp_v6_get_port(struct sock *sk, unsigned short snum)
106 {
107 unsigned int hash2_nulladdr =
108 udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum);
109 unsigned int hash2_partial =
110 udp6_portaddr_hash(sock_net(sk), &inet6_sk(sk)->rcv_saddr, 0);
111
112 /* precompute partial secondary hash */
113 udp_sk(sk)->udp_portaddr_hash = hash2_partial;
114 return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal, hash2_nulladdr);
115 }
116
117 static void udp_v6_rehash(struct sock *sk)
118 {
119 u16 new_hash = udp6_portaddr_hash(sock_net(sk),
120 &inet6_sk(sk)->rcv_saddr,
121 inet_sk(sk)->inet_num);
122
123 udp_lib_rehash(sk, new_hash);
124 }
125
126 static inline int compute_score(struct sock *sk, struct net *net,
127 unsigned short hnum,
128 const struct in6_addr *saddr, __be16 sport,
129 const struct in6_addr *daddr, __be16 dport,
130 int dif)
131 {
132 int score = -1;
133
134 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum &&
135 sk->sk_family == PF_INET6) {
136 struct ipv6_pinfo *np = inet6_sk(sk);
137 struct inet_sock *inet = inet_sk(sk);
138
139 score = 0;
140 if (inet->inet_dport) {
141 if (inet->inet_dport != sport)
142 return -1;
143 score++;
144 }
145 if (!ipv6_addr_any(&np->rcv_saddr)) {
146 if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
147 return -1;
148 score++;
149 }
150 if (!ipv6_addr_any(&np->daddr)) {
151 if (!ipv6_addr_equal(&np->daddr, saddr))
152 return -1;
153 score++;
154 }
155 if (sk->sk_bound_dev_if) {
156 if (sk->sk_bound_dev_if != dif)
157 return -1;
158 score++;
159 }
160 }
161 return score;
162 }
163
164 #define SCORE2_MAX (1 + 1 + 1)
165 static inline int compute_score2(struct sock *sk, struct net *net,
166 const struct in6_addr *saddr, __be16 sport,
167 const struct in6_addr *daddr, unsigned short hnum,
168 int dif)
169 {
170 int score = -1;
171
172 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum &&
173 sk->sk_family == PF_INET6) {
174 struct ipv6_pinfo *np = inet6_sk(sk);
175 struct inet_sock *inet = inet_sk(sk);
176
177 if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
178 return -1;
179 score = 0;
180 if (inet->inet_dport) {
181 if (inet->inet_dport != sport)
182 return -1;
183 score++;
184 }
185 if (!ipv6_addr_any(&np->daddr)) {
186 if (!ipv6_addr_equal(&np->daddr, saddr))
187 return -1;
188 score++;
189 }
190 if (sk->sk_bound_dev_if) {
191 if (sk->sk_bound_dev_if != dif)
192 return -1;
193 score++;
194 }
195 }
196 return score;
197 }
198
199
200 /* called with read_rcu_lock() */
201 static struct sock *udp6_lib_lookup2(struct net *net,
202 const struct in6_addr *saddr, __be16 sport,
203 const struct in6_addr *daddr, unsigned int hnum, int dif,
204 struct udp_hslot *hslot2, unsigned int slot2)
205 {
206 struct sock *sk, *result;
207 struct hlist_nulls_node *node;
208 int score, badness, matches = 0, reuseport = 0;
209 u32 hash = 0;
210
211 begin:
212 result = NULL;
213 badness = -1;
214 udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) {
215 score = compute_score2(sk, net, saddr, sport,
216 daddr, hnum, dif);
217 if (score > badness) {
218 result = sk;
219 badness = score;
220 reuseport = sk->sk_reuseport;
221 if (reuseport) {
222 hash = inet6_ehashfn(net, daddr, hnum,
223 saddr, sport);
224 matches = 1;
225 } else if (score == SCORE2_MAX)
226 goto exact_match;
227 } else if (score == badness && reuseport) {
228 matches++;
229 if (((u64)hash * matches) >> 32 == 0)
230 result = sk;
231 hash = next_pseudo_random32(hash);
232 }
233 }
234 /*
235 * if the nulls value we got at the end of this lookup is
236 * not the expected one, we must restart lookup.
237 * We probably met an item that was moved to another chain.
238 */
239 if (get_nulls_value(node) != slot2)
240 goto begin;
241
242 if (result) {
243 exact_match:
244 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
245 result = NULL;
246 else if (unlikely(compute_score2(result, net, saddr, sport,
247 daddr, hnum, dif) < badness)) {
248 sock_put(result);
249 goto begin;
250 }
251 }
252 return result;
253 }
254
255 struct sock *__udp6_lib_lookup(struct net *net,
256 const struct in6_addr *saddr, __be16 sport,
257 const struct in6_addr *daddr, __be16 dport,
258 int dif, struct udp_table *udptable)
259 {
260 struct sock *sk, *result;
261 struct hlist_nulls_node *node;
262 unsigned short hnum = ntohs(dport);
263 unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask);
264 struct udp_hslot *hslot2, *hslot = &udptable->hash[slot];
265 int score, badness, matches = 0, reuseport = 0;
266 u32 hash = 0;
267
268 rcu_read_lock();
269 if (hslot->count > 10) {
270 hash2 = udp6_portaddr_hash(net, daddr, hnum);
271 slot2 = hash2 & udptable->mask;
272 hslot2 = &udptable->hash2[slot2];
273 if (hslot->count < hslot2->count)
274 goto begin;
275
276 result = udp6_lib_lookup2(net, saddr, sport,
277 daddr, hnum, dif,
278 hslot2, slot2);
279 if (!result) {
280 hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum);
281 slot2 = hash2 & udptable->mask;
282 hslot2 = &udptable->hash2[slot2];
283 if (hslot->count < hslot2->count)
284 goto begin;
285
286 result = udp6_lib_lookup2(net, saddr, sport,
287 &in6addr_any, hnum, dif,
288 hslot2, slot2);
289 }
290 rcu_read_unlock();
291 return result;
292 }
293 begin:
294 result = NULL;
295 badness = -1;
296 sk_nulls_for_each_rcu(sk, node, &hslot->head) {
297 score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif);
298 if (score > badness) {
299 result = sk;
300 badness = score;
301 reuseport = sk->sk_reuseport;
302 if (reuseport) {
303 hash = inet6_ehashfn(net, daddr, hnum,
304 saddr, sport);
305 matches = 1;
306 }
307 } else if (score == badness && reuseport) {
308 matches++;
309 if (((u64)hash * matches) >> 32 == 0)
310 result = sk;
311 hash = next_pseudo_random32(hash);
312 }
313 }
314 /*
315 * if the nulls value we got at the end of this lookup is
316 * not the expected one, we must restart lookup.
317 * We probably met an item that was moved to another chain.
318 */
319 if (get_nulls_value(node) != slot)
320 goto begin;
321
322 if (result) {
323 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
324 result = NULL;
325 else if (unlikely(compute_score(result, net, hnum, saddr, sport,
326 daddr, dport, dif) < badness)) {
327 sock_put(result);
328 goto begin;
329 }
330 }
331 rcu_read_unlock();
332 return result;
333 }
334 EXPORT_SYMBOL_GPL(__udp6_lib_lookup);
335
336 static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb,
337 __be16 sport, __be16 dport,
338 struct udp_table *udptable)
339 {
340 struct sock *sk;
341 const struct ipv6hdr *iph = ipv6_hdr(skb);
342
343 if (unlikely(sk = skb_steal_sock(skb)))
344 return sk;
345 return __udp6_lib_lookup(dev_net(skb_dst(skb)->dev), &iph->saddr, sport,
346 &iph->daddr, dport, inet6_iif(skb),
347 udptable);
348 }
349
350 struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport,
351 const struct in6_addr *daddr, __be16 dport, int dif)
352 {
353 return __udp6_lib_lookup(net, saddr, sport, daddr, dport, dif, &udp_table);
354 }
355 EXPORT_SYMBOL_GPL(udp6_lib_lookup);
356
357
358 /*
359 * This should be easy, if there is something there we
360 * return it, otherwise we block.
361 */
362
363 int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
364 struct msghdr *msg, size_t len,
365 int noblock, int flags, int *addr_len)
366 {
367 struct ipv6_pinfo *np = inet6_sk(sk);
368 struct inet_sock *inet = inet_sk(sk);
369 struct sk_buff *skb;
370 unsigned int ulen, copied;
371 int peeked, off = 0;
372 int err;
373 int is_udplite = IS_UDPLITE(sk);
374 int is_udp4;
375 bool slow;
376
377 if (addr_len)
378 *addr_len = sizeof(struct sockaddr_in6);
379
380 if (flags & MSG_ERRQUEUE)
381 return ipv6_recv_error(sk, msg, len);
382
383 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
384 return ipv6_recv_rxpmtu(sk, msg, len);
385
386 try_again:
387 skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),
388 &peeked, &off, &err);
389 if (!skb)
390 goto out;
391
392 ulen = skb->len - sizeof(struct udphdr);
393 copied = len;
394 if (copied > ulen)
395 copied = ulen;
396 else if (copied < ulen)
397 msg->msg_flags |= MSG_TRUNC;
398
399 is_udp4 = (skb->protocol == htons(ETH_P_IP));
400
401 /*
402 * If checksum is needed at all, try to do it while copying the
403 * data. If the data is truncated, or if we only want a partial
404 * coverage checksum (UDP-Lite), do it before the copy.
405 */
406
407 if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) {
408 if (udp_lib_checksum_complete(skb))
409 goto csum_copy_err;
410 }
411
412 if (skb_csum_unnecessary(skb))
413 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr),
414 msg->msg_iov, copied);
415 else {
416 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
417 if (err == -EINVAL)
418 goto csum_copy_err;
419 }
420 if (unlikely(err)) {
421 trace_kfree_skb(skb, udpv6_recvmsg);
422 if (!peeked) {
423 atomic_inc(&sk->sk_drops);
424 if (is_udp4)
425 UDP_INC_STATS_USER(sock_net(sk),
426 UDP_MIB_INERRORS,
427 is_udplite);
428 else
429 UDP6_INC_STATS_USER(sock_net(sk),
430 UDP_MIB_INERRORS,
431 is_udplite);
432 }
433 goto out_free;
434 }
435 if (!peeked) {
436 if (is_udp4)
437 UDP_INC_STATS_USER(sock_net(sk),
438 UDP_MIB_INDATAGRAMS, is_udplite);
439 else
440 UDP6_INC_STATS_USER(sock_net(sk),
441 UDP_MIB_INDATAGRAMS, is_udplite);
442 }
443
444 sock_recv_ts_and_drops(msg, sk, skb);
445
446 /* Copy the address. */
447 if (msg->msg_name) {
448 struct sockaddr_in6 *sin6;
449
450 sin6 = (struct sockaddr_in6 *) msg->msg_name;
451 sin6->sin6_family = AF_INET6;
452 sin6->sin6_port = udp_hdr(skb)->source;
453 sin6->sin6_flowinfo = 0;
454
455 if (is_udp4) {
456 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
457 &sin6->sin6_addr);
458 sin6->sin6_scope_id = 0;
459 } else {
460 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
461 sin6->sin6_scope_id =
462 ipv6_iface_scope_id(&sin6->sin6_addr,
463 IP6CB(skb)->iif);
464 }
465
466 }
467 if (is_udp4) {
468 if (inet->cmsg_flags)
469 ip_cmsg_recv(msg, skb);
470 } else {
471 if (np->rxopt.all)
472 ip6_datagram_recv_ctl(sk, msg, skb);
473 }
474
475 err = copied;
476 if (flags & MSG_TRUNC)
477 err = ulen;
478
479 out_free:
480 skb_free_datagram_locked(sk, skb);
481 out:
482 return err;
483
484 csum_copy_err:
485 slow = lock_sock_fast(sk);
486 if (!skb_kill_datagram(sk, skb, flags)) {
487 if (is_udp4) {
488 UDP_INC_STATS_USER(sock_net(sk),
489 UDP_MIB_CSUMERRORS, is_udplite);
490 UDP_INC_STATS_USER(sock_net(sk),
491 UDP_MIB_INERRORS, is_udplite);
492 } else {
493 UDP6_INC_STATS_USER(sock_net(sk),
494 UDP_MIB_CSUMERRORS, is_udplite);
495 UDP6_INC_STATS_USER(sock_net(sk),
496 UDP_MIB_INERRORS, is_udplite);
497 }
498 }
499 unlock_sock_fast(sk, slow);
500
501 if (noblock)
502 return -EAGAIN;
503
504 /* starting over for a new packet */
505 msg->msg_flags &= ~MSG_TRUNC;
506 goto try_again;
507 }
508
509 void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
510 u8 type, u8 code, int offset, __be32 info,
511 struct udp_table *udptable)
512 {
513 struct ipv6_pinfo *np;
514 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
515 const struct in6_addr *saddr = &hdr->saddr;
516 const struct in6_addr *daddr = &hdr->daddr;
517 struct udphdr *uh = (struct udphdr*)(skb->data+offset);
518 struct sock *sk;
519 int err;
520
521 sk = __udp6_lib_lookup(dev_net(skb->dev), daddr, uh->dest,
522 saddr, uh->source, inet6_iif(skb), udptable);
523 if (sk == NULL)
524 return;
525
526 if (type == ICMPV6_PKT_TOOBIG)
527 ip6_sk_update_pmtu(skb, sk, info);
528 if (type == NDISC_REDIRECT) {
529 ip6_sk_redirect(skb, sk);
530 goto out;
531 }
532
533 np = inet6_sk(sk);
534
535 if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
536 goto out;
537
538 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
539 goto out;
540
541 if (np->recverr)
542 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
543
544 sk->sk_err = err;
545 sk->sk_error_report(sk);
546 out:
547 sock_put(sk);
548 }
549
550 static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
551 {
552 int rc;
553
554 if (!ipv6_addr_any(&inet6_sk(sk)->daddr))
555 sock_rps_save_rxhash(sk, skb);
556
557 rc = sock_queue_rcv_skb(sk, skb);
558 if (rc < 0) {
559 int is_udplite = IS_UDPLITE(sk);
560
561 /* Note that an ENOMEM error is charged twice */
562 if (rc == -ENOMEM)
563 UDP6_INC_STATS_BH(sock_net(sk),
564 UDP_MIB_RCVBUFERRORS, is_udplite);
565 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
566 kfree_skb(skb);
567 return -1;
568 }
569 return 0;
570 }
571
572 static __inline__ void udpv6_err(struct sk_buff *skb,
573 struct inet6_skb_parm *opt, u8 type,
574 u8 code, int offset, __be32 info )
575 {
576 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table);
577 }
578
579 static struct static_key udpv6_encap_needed __read_mostly;
580 void udpv6_encap_enable(void)
581 {
582 if (!static_key_enabled(&udpv6_encap_needed))
583 static_key_slow_inc(&udpv6_encap_needed);
584 }
585 EXPORT_SYMBOL(udpv6_encap_enable);
586
587 int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
588 {
589 struct udp_sock *up = udp_sk(sk);
590 int rc;
591 int is_udplite = IS_UDPLITE(sk);
592
593 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
594 goto drop;
595
596 if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
597 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
598
599 /*
600 * This is an encapsulation socket so pass the skb to
601 * the socket's udp_encap_rcv() hook. Otherwise, just
602 * fall through and pass this up the UDP socket.
603 * up->encap_rcv() returns the following value:
604 * =0 if skb was successfully passed to the encap
605 * handler or was discarded by it.
606 * >0 if skb should be passed on to UDP.
607 * <0 if skb should be resubmitted as proto -N
608 */
609
610 /* if we're overly short, let UDP handle it */
611 encap_rcv = ACCESS_ONCE(up->encap_rcv);
612 if (skb->len > sizeof(struct udphdr) && encap_rcv != NULL) {
613 int ret;
614
615 ret = encap_rcv(sk, skb);
616 if (ret <= 0) {
617 UDP_INC_STATS_BH(sock_net(sk),
618 UDP_MIB_INDATAGRAMS,
619 is_udplite);
620 return -ret;
621 }
622 }
623
624 /* FALLTHROUGH -- it's a UDP Packet */
625 }
626
627 /*
628 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
629 */
630 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
631
632 if (up->pcrlen == 0) { /* full coverage was set */
633 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage"
634 " %d while full coverage %d requested\n",
635 UDP_SKB_CB(skb)->cscov, skb->len);
636 goto drop;
637 }
638 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
639 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d "
640 "too small, need min %d\n",
641 UDP_SKB_CB(skb)->cscov, up->pcrlen);
642 goto drop;
643 }
644 }
645
646 if (rcu_access_pointer(sk->sk_filter)) {
647 if (udp_lib_checksum_complete(skb))
648 goto csum_error;
649 }
650
651 if (sk_rcvqueues_full(sk, skb, sk->sk_rcvbuf))
652 goto drop;
653
654 skb_dst_drop(skb);
655
656 bh_lock_sock(sk);
657 rc = 0;
658 if (!sock_owned_by_user(sk))
659 rc = __udpv6_queue_rcv_skb(sk, skb);
660 else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
661 bh_unlock_sock(sk);
662 goto drop;
663 }
664 bh_unlock_sock(sk);
665
666 return rc;
667 csum_error:
668 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite);
669 drop:
670 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
671 atomic_inc(&sk->sk_drops);
672 kfree_skb(skb);
673 return -1;
674 }
675
676 static struct sock *udp_v6_mcast_next(struct net *net, struct sock *sk,
677 __be16 loc_port, const struct in6_addr *loc_addr,
678 __be16 rmt_port, const struct in6_addr *rmt_addr,
679 int dif)
680 {
681 struct hlist_nulls_node *node;
682 struct sock *s = sk;
683 unsigned short num = ntohs(loc_port);
684
685 sk_nulls_for_each_from(s, node) {
686 struct inet_sock *inet = inet_sk(s);
687
688 if (!net_eq(sock_net(s), net))
689 continue;
690
691 if (udp_sk(s)->udp_port_hash == num &&
692 s->sk_family == PF_INET6) {
693 struct ipv6_pinfo *np = inet6_sk(s);
694 if (inet->inet_dport) {
695 if (inet->inet_dport != rmt_port)
696 continue;
697 }
698 if (!ipv6_addr_any(&np->daddr) &&
699 !ipv6_addr_equal(&np->daddr, rmt_addr))
700 continue;
701
702 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)
703 continue;
704
705 if (!ipv6_addr_any(&np->rcv_saddr)) {
706 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr))
707 continue;
708 }
709 if (!inet6_mc_check(s, loc_addr, rmt_addr))
710 continue;
711 return s;
712 }
713 }
714 return NULL;
715 }
716
717 static void flush_stack(struct sock **stack, unsigned int count,
718 struct sk_buff *skb, unsigned int final)
719 {
720 struct sk_buff *skb1 = NULL;
721 struct sock *sk;
722 unsigned int i;
723
724 for (i = 0; i < count; i++) {
725 sk = stack[i];
726 if (likely(skb1 == NULL))
727 skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC);
728 if (!skb1) {
729 atomic_inc(&sk->sk_drops);
730 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS,
731 IS_UDPLITE(sk));
732 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS,
733 IS_UDPLITE(sk));
734 }
735
736 if (skb1 && udpv6_queue_rcv_skb(sk, skb1) <= 0)
737 skb1 = NULL;
738 }
739 if (unlikely(skb1))
740 kfree_skb(skb1);
741 }
742 /*
743 * Note: called only from the BH handler context,
744 * so we don't need to lock the hashes.
745 */
746 static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
747 const struct in6_addr *saddr, const struct in6_addr *daddr,
748 struct udp_table *udptable)
749 {
750 struct sock *sk, *stack[256 / sizeof(struct sock *)];
751 const struct udphdr *uh = udp_hdr(skb);
752 struct udp_hslot *hslot = udp_hashslot(udptable, net, ntohs(uh->dest));
753 int dif;
754 unsigned int i, count = 0;
755
756 spin_lock(&hslot->lock);
757 sk = sk_nulls_head(&hslot->head);
758 dif = inet6_iif(skb);
759 sk = udp_v6_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif);
760 while (sk) {
761 stack[count++] = sk;
762 sk = udp_v6_mcast_next(net, sk_nulls_next(sk), uh->dest, daddr,
763 uh->source, saddr, dif);
764 if (unlikely(count == ARRAY_SIZE(stack))) {
765 if (!sk)
766 break;
767 flush_stack(stack, count, skb, ~0);
768 count = 0;
769 }
770 }
771 /*
772 * before releasing the lock, we must take reference on sockets
773 */
774 for (i = 0; i < count; i++)
775 sock_hold(stack[i]);
776
777 spin_unlock(&hslot->lock);
778
779 if (count) {
780 flush_stack(stack, count, skb, count - 1);
781
782 for (i = 0; i < count; i++)
783 sock_put(stack[i]);
784 } else {
785 kfree_skb(skb);
786 }
787 return 0;
788 }
789
790 int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
791 int proto)
792 {
793 struct net *net = dev_net(skb->dev);
794 struct sock *sk;
795 struct udphdr *uh;
796 const struct in6_addr *saddr, *daddr;
797 u32 ulen = 0;
798
799 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
800 goto discard;
801
802 saddr = &ipv6_hdr(skb)->saddr;
803 daddr = &ipv6_hdr(skb)->daddr;
804 uh = udp_hdr(skb);
805
806 ulen = ntohs(uh->len);
807 if (ulen > skb->len)
808 goto short_packet;
809
810 if (proto == IPPROTO_UDP) {
811 /* UDP validates ulen. */
812
813 /* Check for jumbo payload */
814 if (ulen == 0)
815 ulen = skb->len;
816
817 if (ulen < sizeof(*uh))
818 goto short_packet;
819
820 if (ulen < skb->len) {
821 if (pskb_trim_rcsum(skb, ulen))
822 goto short_packet;
823 saddr = &ipv6_hdr(skb)->saddr;
824 daddr = &ipv6_hdr(skb)->daddr;
825 uh = udp_hdr(skb);
826 }
827 }
828
829 if (udp6_csum_init(skb, uh, proto))
830 goto csum_error;
831
832 /*
833 * Multicast receive code
834 */
835 if (ipv6_addr_is_multicast(daddr))
836 return __udp6_lib_mcast_deliver(net, skb,
837 saddr, daddr, udptable);
838
839 /* Unicast */
840
841 /*
842 * check socket cache ... must talk to Alan about his plans
843 * for sock caches... i'll skip this for now.
844 */
845 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
846 if (sk != NULL) {
847 int ret;
848
849 sk_mark_napi_id(sk, skb);
850 ret = udpv6_queue_rcv_skb(sk, skb);
851 sock_put(sk);
852
853 /* a return value > 0 means to resubmit the input, but
854 * it wants the return to be -protocol, or 0
855 */
856 if (ret > 0)
857 return -ret;
858
859 return 0;
860 }
861
862 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
863 goto discard;
864
865 if (udp_lib_checksum_complete(skb))
866 goto csum_error;
867
868 UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
869 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
870
871 kfree_skb(skb);
872 return 0;
873
874 short_packet:
875 LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n",
876 proto == IPPROTO_UDPLITE ? "-Lite" : "",
877 saddr,
878 ntohs(uh->source),
879 ulen,
880 skb->len,
881 daddr,
882 ntohs(uh->dest));
883 goto discard;
884 csum_error:
885 UDP6_INC_STATS_BH(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE);
886 discard:
887 UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
888 kfree_skb(skb);
889 return 0;
890 }
891
892 static __inline__ int udpv6_rcv(struct sk_buff *skb)
893 {
894 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP);
895 }
896
897 /*
898 * Throw away all pending data and cancel the corking. Socket is locked.
899 */
900 static void udp_v6_flush_pending_frames(struct sock *sk)
901 {
902 struct udp_sock *up = udp_sk(sk);
903
904 if (up->pending == AF_INET)
905 udp_flush_pending_frames(sk);
906 else if (up->pending) {
907 up->len = 0;
908 up->pending = 0;
909 ip6_flush_pending_frames(sk);
910 }
911 }
912
913 /**
914 * udp6_hwcsum_outgoing - handle outgoing HW checksumming
915 * @sk: socket we are sending on
916 * @skb: sk_buff containing the filled-in UDP header
917 * (checksum field must be zeroed out)
918 */
919 static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
920 const struct in6_addr *saddr,
921 const struct in6_addr *daddr, int len)
922 {
923 unsigned int offset;
924 struct udphdr *uh = udp_hdr(skb);
925 __wsum csum = 0;
926
927 if (skb_queue_len(&sk->sk_write_queue) == 1) {
928 /* Only one fragment on the socket. */
929 skb->csum_start = skb_transport_header(skb) - skb->head;
930 skb->csum_offset = offsetof(struct udphdr, check);
931 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0);
932 } else {
933 /*
934 * HW-checksum won't work as there are two or more
935 * fragments on the socket so that all csums of sk_buffs
936 * should be together
937 */
938 offset = skb_transport_offset(skb);
939 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
940
941 skb->ip_summed = CHECKSUM_NONE;
942
943 skb_queue_walk(&sk->sk_write_queue, skb) {
944 csum = csum_add(csum, skb->csum);
945 }
946
947 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP,
948 csum);
949 if (uh->check == 0)
950 uh->check = CSUM_MANGLED_0;
951 }
952 }
953
954 /*
955 * Sending
956 */
957
958 static int udp_v6_push_pending_frames(struct sock *sk)
959 {
960 struct sk_buff *skb;
961 struct udphdr *uh;
962 struct udp_sock *up = udp_sk(sk);
963 struct inet_sock *inet = inet_sk(sk);
964 struct flowi6 *fl6;
965 int err = 0;
966 int is_udplite = IS_UDPLITE(sk);
967 __wsum csum = 0;
968
969 if (up->pending == AF_INET)
970 return udp_push_pending_frames(sk);
971
972 fl6 = &inet->cork.fl.u.ip6;
973
974 /* Grab the skbuff where UDP header space exists. */
975 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
976 goto out;
977
978 /*
979 * Create a UDP header
980 */
981 uh = udp_hdr(skb);
982 uh->source = fl6->fl6_sport;
983 uh->dest = fl6->fl6_dport;
984 uh->len = htons(up->len);
985 uh->check = 0;
986
987 if (is_udplite)
988 csum = udplite_csum_outgoing(sk, skb);
989 else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
990 udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr,
991 up->len);
992 goto send;
993 } else
994 csum = udp_csum_outgoing(sk, skb);
995
996 /* add protocol-dependent pseudo-header */
997 uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
998 up->len, fl6->flowi6_proto, csum);
999 if (uh->check == 0)
1000 uh->check = CSUM_MANGLED_0;
1001
1002 send:
1003 err = ip6_push_pending_frames(sk);
1004 if (err) {
1005 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) {
1006 UDP6_INC_STATS_USER(sock_net(sk),
1007 UDP_MIB_SNDBUFERRORS, is_udplite);
1008 err = 0;
1009 }
1010 } else
1011 UDP6_INC_STATS_USER(sock_net(sk),
1012 UDP_MIB_OUTDATAGRAMS, is_udplite);
1013 out:
1014 up->len = 0;
1015 up->pending = 0;
1016 return err;
1017 }
1018
1019 int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
1020 struct msghdr *msg, size_t len)
1021 {
1022 struct ipv6_txoptions opt_space;
1023 struct udp_sock *up = udp_sk(sk);
1024 struct inet_sock *inet = inet_sk(sk);
1025 struct ipv6_pinfo *np = inet6_sk(sk);
1026 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
1027 struct in6_addr *daddr, *final_p, final;
1028 struct ipv6_txoptions *opt = NULL;
1029 struct ip6_flowlabel *flowlabel = NULL;
1030 struct flowi6 fl6;
1031 struct dst_entry *dst;
1032 int addr_len = msg->msg_namelen;
1033 int ulen = len;
1034 int hlimit = -1;
1035 int tclass = -1;
1036 int dontfrag = -1;
1037 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
1038 int err;
1039 int connected = 0;
1040 int is_udplite = IS_UDPLITE(sk);
1041 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
1042
1043 /* destination address check */
1044 if (sin6) {
1045 if (addr_len < offsetof(struct sockaddr, sa_data))
1046 return -EINVAL;
1047
1048 switch (sin6->sin6_family) {
1049 case AF_INET6:
1050 if (addr_len < SIN6_LEN_RFC2133)
1051 return -EINVAL;
1052 daddr = &sin6->sin6_addr;
1053 break;
1054 case AF_INET:
1055 goto do_udp_sendmsg;
1056 case AF_UNSPEC:
1057 msg->msg_name = sin6 = NULL;
1058 msg->msg_namelen = addr_len = 0;
1059 daddr = NULL;
1060 break;
1061 default:
1062 return -EINVAL;
1063 }
1064 } else if (!up->pending) {
1065 if (sk->sk_state != TCP_ESTABLISHED)
1066 return -EDESTADDRREQ;
1067 daddr = &np->daddr;
1068 } else
1069 daddr = NULL;
1070
1071 if (daddr) {
1072 if (ipv6_addr_v4mapped(daddr)) {
1073 struct sockaddr_in sin;
1074 sin.sin_family = AF_INET;
1075 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport;
1076 sin.sin_addr.s_addr = daddr->s6_addr32[3];
1077 msg->msg_name = &sin;
1078 msg->msg_namelen = sizeof(sin);
1079 do_udp_sendmsg:
1080 if (__ipv6_only_sock(sk))
1081 return -ENETUNREACH;
1082 return udp_sendmsg(iocb, sk, msg, len);
1083 }
1084 }
1085
1086 if (up->pending == AF_INET)
1087 return udp_sendmsg(iocb, sk, msg, len);
1088
1089 /* Rough check on arithmetic overflow,
1090 better check is made in ip6_append_data().
1091 */
1092 if (len > INT_MAX - sizeof(struct udphdr))
1093 return -EMSGSIZE;
1094
1095 if (up->pending) {
1096 /*
1097 * There are pending frames.
1098 * The socket lock must be held while it's corked.
1099 */
1100 lock_sock(sk);
1101 if (likely(up->pending)) {
1102 if (unlikely(up->pending != AF_INET6)) {
1103 release_sock(sk);
1104 return -EAFNOSUPPORT;
1105 }
1106 dst = NULL;
1107 goto do_append_data;
1108 }
1109 release_sock(sk);
1110 }
1111 ulen += sizeof(struct udphdr);
1112
1113 memset(&fl6, 0, sizeof(fl6));
1114
1115 if (sin6) {
1116 if (sin6->sin6_port == 0)
1117 return -EINVAL;
1118
1119 fl6.fl6_dport = sin6->sin6_port;
1120 daddr = &sin6->sin6_addr;
1121
1122 if (np->sndflow) {
1123 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
1124 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
1125 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1126 if (flowlabel == NULL)
1127 return -EINVAL;
1128 daddr = &flowlabel->dst;
1129 }
1130 }
1131
1132 /*
1133 * Otherwise it will be difficult to maintain
1134 * sk->sk_dst_cache.
1135 */
1136 if (sk->sk_state == TCP_ESTABLISHED &&
1137 ipv6_addr_equal(daddr, &np->daddr))
1138 daddr = &np->daddr;
1139
1140 if (addr_len >= sizeof(struct sockaddr_in6) &&
1141 sin6->sin6_scope_id &&
1142 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
1143 fl6.flowi6_oif = sin6->sin6_scope_id;
1144 } else {
1145 if (sk->sk_state != TCP_ESTABLISHED)
1146 return -EDESTADDRREQ;
1147
1148 fl6.fl6_dport = inet->inet_dport;
1149 daddr = &np->daddr;
1150 fl6.flowlabel = np->flow_label;
1151 connected = 1;
1152 }
1153
1154 if (!fl6.flowi6_oif)
1155 fl6.flowi6_oif = sk->sk_bound_dev_if;
1156
1157 if (!fl6.flowi6_oif)
1158 fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex;
1159
1160 fl6.flowi6_mark = sk->sk_mark;
1161
1162 if (msg->msg_controllen) {
1163 opt = &opt_space;
1164 memset(opt, 0, sizeof(struct ipv6_txoptions));
1165 opt->tot_len = sizeof(*opt);
1166
1167 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt,
1168 &hlimit, &tclass, &dontfrag);
1169 if (err < 0) {
1170 fl6_sock_release(flowlabel);
1171 return err;
1172 }
1173 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
1174 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1175 if (flowlabel == NULL)
1176 return -EINVAL;
1177 }
1178 if (!(opt->opt_nflen|opt->opt_flen))
1179 opt = NULL;
1180 connected = 0;
1181 }
1182 if (opt == NULL)
1183 opt = np->opt;
1184 if (flowlabel)
1185 opt = fl6_merge_options(&opt_space, flowlabel, opt);
1186 opt = ipv6_fixup_options(&opt_space, opt);
1187
1188 fl6.flowi6_proto = sk->sk_protocol;
1189 if (!ipv6_addr_any(daddr))
1190 fl6.daddr = *daddr;
1191 else
1192 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
1193 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
1194 fl6.saddr = np->saddr;
1195 fl6.fl6_sport = inet->inet_sport;
1196
1197 final_p = fl6_update_dst(&fl6, opt, &final);
1198 if (final_p)
1199 connected = 0;
1200
1201 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) {
1202 fl6.flowi6_oif = np->mcast_oif;
1203 connected = 0;
1204 } else if (!fl6.flowi6_oif)
1205 fl6.flowi6_oif = np->ucast_oif;
1206
1207 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
1208
1209 dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p, true);
1210 if (IS_ERR(dst)) {
1211 err = PTR_ERR(dst);
1212 dst = NULL;
1213 goto out;
1214 }
1215
1216 if (hlimit < 0) {
1217 if (ipv6_addr_is_multicast(&fl6.daddr))
1218 hlimit = np->mcast_hops;
1219 else
1220 hlimit = np->hop_limit;
1221 if (hlimit < 0)
1222 hlimit = ip6_dst_hoplimit(dst);
1223 }
1224
1225 if (tclass < 0)
1226 tclass = np->tclass;
1227
1228 if (msg->msg_flags&MSG_CONFIRM)
1229 goto do_confirm;
1230 back_from_confirm:
1231
1232 lock_sock(sk);
1233 if (unlikely(up->pending)) {
1234 /* The socket is already corked while preparing it. */
1235 /* ... which is an evident application bug. --ANK */
1236 release_sock(sk);
1237
1238 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
1239 err = -EINVAL;
1240 goto out;
1241 }
1242
1243 up->pending = AF_INET6;
1244
1245 do_append_data:
1246 if (dontfrag < 0)
1247 dontfrag = np->dontfrag;
1248 up->len += ulen;
1249 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
1250 err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen,
1251 sizeof(struct udphdr), hlimit, tclass, opt, &fl6,
1252 (struct rt6_info*)dst,
1253 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, dontfrag);
1254 if (err)
1255 udp_v6_flush_pending_frames(sk);
1256 else if (!corkreq)
1257 err = udp_v6_push_pending_frames(sk);
1258 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
1259 up->pending = 0;
1260
1261 if (dst) {
1262 if (connected) {
1263 ip6_dst_store(sk, dst,
1264 ipv6_addr_equal(&fl6.daddr, &np->daddr) ?
1265 &np->daddr : NULL,
1266 #ifdef CONFIG_IPV6_SUBTREES
1267 ipv6_addr_equal(&fl6.saddr, &np->saddr) ?
1268 &np->saddr :
1269 #endif
1270 NULL);
1271 } else {
1272 dst_release(dst);
1273 }
1274 dst = NULL;
1275 }
1276
1277 if (err > 0)
1278 err = np->recverr ? net_xmit_errno(err) : 0;
1279 release_sock(sk);
1280 out:
1281 dst_release(dst);
1282 fl6_sock_release(flowlabel);
1283 if (!err)
1284 return len;
1285 /*
1286 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
1287 * ENOBUFS might not be good (it's not tunable per se), but otherwise
1288 * we don't have a good statistic (IpOutDiscards but it can be too many
1289 * things). We could add another new stat but at least for now that
1290 * seems like overkill.
1291 */
1292 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
1293 UDP6_INC_STATS_USER(sock_net(sk),
1294 UDP_MIB_SNDBUFERRORS, is_udplite);
1295 }
1296 return err;
1297
1298 do_confirm:
1299 dst_confirm(dst);
1300 if (!(msg->msg_flags&MSG_PROBE) || len)
1301 goto back_from_confirm;
1302 err = 0;
1303 goto out;
1304 }
1305
1306 void udpv6_destroy_sock(struct sock *sk)
1307 {
1308 struct udp_sock *up = udp_sk(sk);
1309 lock_sock(sk);
1310 udp_v6_flush_pending_frames(sk);
1311 release_sock(sk);
1312
1313 if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
1314 void (*encap_destroy)(struct sock *sk);
1315 encap_destroy = ACCESS_ONCE(up->encap_destroy);
1316 if (encap_destroy)
1317 encap_destroy(sk);
1318 }
1319
1320 inet6_destroy_sock(sk);
1321 }
1322
1323 /*
1324 * Socket option code for UDP
1325 */
1326 int udpv6_setsockopt(struct sock *sk, int level, int optname,
1327 char __user *optval, unsigned int optlen)
1328 {
1329 if (level == SOL_UDP || level == SOL_UDPLITE)
1330 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1331 udp_v6_push_pending_frames);
1332 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1333 }
1334
1335 #ifdef CONFIG_COMPAT
1336 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
1337 char __user *optval, unsigned int optlen)
1338 {
1339 if (level == SOL_UDP || level == SOL_UDPLITE)
1340 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1341 udp_v6_push_pending_frames);
1342 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
1343 }
1344 #endif
1345
1346 int udpv6_getsockopt(struct sock *sk, int level, int optname,
1347 char __user *optval, int __user *optlen)
1348 {
1349 if (level == SOL_UDP || level == SOL_UDPLITE)
1350 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1351 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1352 }
1353
1354 #ifdef CONFIG_COMPAT
1355 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
1356 char __user *optval, int __user *optlen)
1357 {
1358 if (level == SOL_UDP || level == SOL_UDPLITE)
1359 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1360 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
1361 }
1362 #endif
1363
1364 static const struct inet6_protocol udpv6_protocol = {
1365 .handler = udpv6_rcv,
1366 .err_handler = udpv6_err,
1367 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1368 };
1369
1370 /* ------------------------------------------------------------------------ */
1371 #ifdef CONFIG_PROC_FS
1372 int udp6_seq_show(struct seq_file *seq, void *v)
1373 {
1374 if (v == SEQ_START_TOKEN) {
1375 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
1376 } else {
1377 int bucket = ((struct udp_iter_state *)seq->private)->bucket;
1378 struct inet_sock *inet = inet_sk(v);
1379 __u16 srcp = ntohs(inet->inet_sport);
1380 __u16 destp = ntohs(inet->inet_dport);
1381 ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket);
1382 }
1383 return 0;
1384 }
1385
1386 static const struct file_operations udp6_afinfo_seq_fops = {
1387 .owner = THIS_MODULE,
1388 .open = udp_seq_open,
1389 .read = seq_read,
1390 .llseek = seq_lseek,
1391 .release = seq_release_net
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 = &udp6_afinfo_seq_fops,
1399 .seq_ops = {
1400 .show = udp6_seq_show,
1401 },
1402 };
1403
1404 int __net_init udp6_proc_init(struct net *net)
1405 {
1406 return udp_proc_register(net, &udp6_seq_afinfo);
1407 }
1408
1409 void udp6_proc_exit(struct net *net) {
1410 udp_proc_unregister(net, &udp6_seq_afinfo);
1411 }
1412 #endif /* CONFIG_PROC_FS */
1413
1414 void udp_v6_clear_sk(struct sock *sk, int size)
1415 {
1416 struct inet_sock *inet = inet_sk(sk);
1417
1418 /* we do not want to clear pinet6 field, because of RCU lookups */
1419 sk_prot_clear_portaddr_nulls(sk, offsetof(struct inet_sock, pinet6));
1420
1421 size -= offsetof(struct inet_sock, pinet6) + sizeof(inet->pinet6);
1422 memset(&inet->pinet6 + 1, 0, size);
1423 }
1424
1425 /* ------------------------------------------------------------------------ */
1426
1427 struct proto udpv6_prot = {
1428 .name = "UDPv6",
1429 .owner = THIS_MODULE,
1430 .close = udp_lib_close,
1431 .connect = ip6_datagram_connect,
1432 .disconnect = udp_disconnect,
1433 .ioctl = udp_ioctl,
1434 .destroy = udpv6_destroy_sock,
1435 .setsockopt = udpv6_setsockopt,
1436 .getsockopt = udpv6_getsockopt,
1437 .sendmsg = udpv6_sendmsg,
1438 .recvmsg = udpv6_recvmsg,
1439 .backlog_rcv = __udpv6_queue_rcv_skb,
1440 .hash = udp_lib_hash,
1441 .unhash = udp_lib_unhash,
1442 .rehash = udp_v6_rehash,
1443 .get_port = udp_v6_get_port,
1444 .memory_allocated = &udp_memory_allocated,
1445 .sysctl_mem = sysctl_udp_mem,
1446 .sysctl_wmem = &sysctl_udp_wmem_min,
1447 .sysctl_rmem = &sysctl_udp_rmem_min,
1448 .obj_size = sizeof(struct udp6_sock),
1449 .slab_flags = SLAB_DESTROY_BY_RCU,
1450 .h.udp_table = &udp_table,
1451 #ifdef CONFIG_COMPAT
1452 .compat_setsockopt = compat_udpv6_setsockopt,
1453 .compat_getsockopt = compat_udpv6_getsockopt,
1454 #endif
1455 .clear_sk = udp_v6_clear_sk,
1456 };
1457
1458 static struct inet_protosw udpv6_protosw = {
1459 .type = SOCK_DGRAM,
1460 .protocol = IPPROTO_UDP,
1461 .prot = &udpv6_prot,
1462 .ops = &inet6_dgram_ops,
1463 .no_check = UDP_CSUM_DEFAULT,
1464 .flags = INET_PROTOSW_PERMANENT,
1465 };
1466
1467
1468 int __init udpv6_init(void)
1469 {
1470 int ret;
1471
1472 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
1473 if (ret)
1474 goto out;
1475
1476 ret = inet6_register_protosw(&udpv6_protosw);
1477 if (ret)
1478 goto out_udpv6_protocol;
1479 out:
1480 return ret;
1481
1482 out_udpv6_protocol:
1483 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1484 goto out;
1485 }
1486
1487 void udpv6_exit(void)
1488 {
1489 inet6_unregister_protosw(&udpv6_protosw);
1490 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1491 }
Linus' kernel tree