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netfilter: nf_conntrack: refactor l3proto support for netns
[deliverable/linux.git] / net / ipv6 / udp.c
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 <trace/events/skb.h>
52 #include "udp_impl.h"
53
54 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
55 {
56 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
57 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
58 __be32 sk1_rcv_saddr = sk_rcv_saddr(sk);
59 __be32 sk2_rcv_saddr = sk_rcv_saddr(sk2);
60 int sk_ipv6only = ipv6_only_sock(sk);
61 int sk2_ipv6only = inet_v6_ipv6only(sk2);
62 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
63 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
64
65 /* if both are mapped, treat as IPv4 */
66 if (addr_type == IPV6_ADDR_MAPPED && addr_type2 == IPV6_ADDR_MAPPED)
67 return (!sk2_ipv6only &&
68 (!sk1_rcv_saddr || !sk2_rcv_saddr ||
69 sk1_rcv_saddr == sk2_rcv_saddr));
70
71 if (addr_type2 == IPV6_ADDR_ANY &&
72 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
73 return 1;
74
75 if (addr_type == IPV6_ADDR_ANY &&
76 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
77 return 1;
78
79 if (sk2_rcv_saddr6 &&
80 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
81 return 1;
82
83 return 0;
84 }
85
86 static unsigned int udp6_portaddr_hash(struct net *net,
87 const struct in6_addr *addr6,
88 unsigned int port)
89 {
90 unsigned int hash, mix = net_hash_mix(net);
91
92 if (ipv6_addr_any(addr6))
93 hash = jhash_1word(0, mix);
94 else if (ipv6_addr_v4mapped(addr6))
95 hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix);
96 else
97 hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix);
98
99 return hash ^ port;
100 }
101
102
103 int udp_v6_get_port(struct sock *sk, unsigned short snum)
104 {
105 unsigned int hash2_nulladdr =
106 udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum);
107 unsigned int hash2_partial =
108 udp6_portaddr_hash(sock_net(sk), &inet6_sk(sk)->rcv_saddr, 0);
109
110 /* precompute partial secondary hash */
111 udp_sk(sk)->udp_portaddr_hash = hash2_partial;
112 return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal, hash2_nulladdr);
113 }
114
115 static void udp_v6_rehash(struct sock *sk)
116 {
117 u16 new_hash = udp6_portaddr_hash(sock_net(sk),
118 &inet6_sk(sk)->rcv_saddr,
119 inet_sk(sk)->inet_num);
120
121 udp_lib_rehash(sk, new_hash);
122 }
123
124 static inline int compute_score(struct sock *sk, struct net *net,
125 unsigned short hnum,
126 const struct in6_addr *saddr, __be16 sport,
127 const struct in6_addr *daddr, __be16 dport,
128 int dif)
129 {
130 int score = -1;
131
132 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum &&
133 sk->sk_family == PF_INET6) {
134 struct ipv6_pinfo *np = inet6_sk(sk);
135 struct inet_sock *inet = inet_sk(sk);
136
137 score = 0;
138 if (inet->inet_dport) {
139 if (inet->inet_dport != sport)
140 return -1;
141 score++;
142 }
143 if (!ipv6_addr_any(&np->rcv_saddr)) {
144 if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
145 return -1;
146 score++;
147 }
148 if (!ipv6_addr_any(&np->daddr)) {
149 if (!ipv6_addr_equal(&np->daddr, saddr))
150 return -1;
151 score++;
152 }
153 if (sk->sk_bound_dev_if) {
154 if (sk->sk_bound_dev_if != dif)
155 return -1;
156 score++;
157 }
158 }
159 return score;
160 }
161
162 #define SCORE2_MAX (1 + 1 + 1)
163 static inline int compute_score2(struct sock *sk, struct net *net,
164 const struct in6_addr *saddr, __be16 sport,
165 const struct in6_addr *daddr, unsigned short hnum,
166 int dif)
167 {
168 int score = -1;
169
170 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum &&
171 sk->sk_family == PF_INET6) {
172 struct ipv6_pinfo *np = inet6_sk(sk);
173 struct inet_sock *inet = inet_sk(sk);
174
175 if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
176 return -1;
177 score = 0;
178 if (inet->inet_dport) {
179 if (inet->inet_dport != sport)
180 return -1;
181 score++;
182 }
183 if (!ipv6_addr_any(&np->daddr)) {
184 if (!ipv6_addr_equal(&np->daddr, saddr))
185 return -1;
186 score++;
187 }
188 if (sk->sk_bound_dev_if) {
189 if (sk->sk_bound_dev_if != dif)
190 return -1;
191 score++;
192 }
193 }
194 return score;
195 }
196
197
198 /* called with read_rcu_lock() */
199 static struct sock *udp6_lib_lookup2(struct net *net,
200 const struct in6_addr *saddr, __be16 sport,
201 const struct in6_addr *daddr, unsigned int hnum, int dif,
202 struct udp_hslot *hslot2, unsigned int slot2)
203 {
204 struct sock *sk, *result;
205 struct hlist_nulls_node *node;
206 int score, badness;
207
208 begin:
209 result = NULL;
210 badness = -1;
211 udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) {
212 score = compute_score2(sk, net, saddr, sport,
213 daddr, hnum, dif);
214 if (score > badness) {
215 result = sk;
216 badness = score;
217 if (score == SCORE2_MAX)
218 goto exact_match;
219 }
220 }
221 /*
222 * if the nulls value we got at the end of this lookup is
223 * not the expected one, we must restart lookup.
224 * We probably met an item that was moved to another chain.
225 */
226 if (get_nulls_value(node) != slot2)
227 goto begin;
228
229 if (result) {
230 exact_match:
231 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
232 result = NULL;
233 else if (unlikely(compute_score2(result, net, saddr, sport,
234 daddr, hnum, dif) < badness)) {
235 sock_put(result);
236 goto begin;
237 }
238 }
239 return result;
240 }
241
242 struct sock *__udp6_lib_lookup(struct net *net,
243 const struct in6_addr *saddr, __be16 sport,
244 const struct in6_addr *daddr, __be16 dport,
245 int dif, struct udp_table *udptable)
246 {
247 struct sock *sk, *result;
248 struct hlist_nulls_node *node;
249 unsigned short hnum = ntohs(dport);
250 unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask);
251 struct udp_hslot *hslot2, *hslot = &udptable->hash[slot];
252 int score, badness;
253
254 rcu_read_lock();
255 if (hslot->count > 10) {
256 hash2 = udp6_portaddr_hash(net, daddr, 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 daddr, hnum, dif,
264 hslot2, slot2);
265 if (!result) {
266 hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum);
267 slot2 = hash2 & udptable->mask;
268 hslot2 = &udptable->hash2[slot2];
269 if (hslot->count < hslot2->count)
270 goto begin;
271
272 result = udp6_lib_lookup2(net, saddr, sport,
273 &in6addr_any, hnum, dif,
274 hslot2, slot2);
275 }
276 rcu_read_unlock();
277 return result;
278 }
279 begin:
280 result = NULL;
281 badness = -1;
282 sk_nulls_for_each_rcu(sk, node, &hslot->head) {
283 score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif);
284 if (score > badness) {
285 result = sk;
286 badness = score;
287 }
288 }
289 /*
290 * if the nulls value we got at the end of this lookup is
291 * not the expected one, we must restart lookup.
292 * We probably met an item that was moved to another chain.
293 */
294 if (get_nulls_value(node) != slot)
295 goto begin;
296
297 if (result) {
298 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
299 result = NULL;
300 else if (unlikely(compute_score(result, net, hnum, saddr, sport,
301 daddr, dport, dif) < badness)) {
302 sock_put(result);
303 goto begin;
304 }
305 }
306 rcu_read_unlock();
307 return result;
308 }
309 EXPORT_SYMBOL_GPL(__udp6_lib_lookup);
310
311 static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb,
312 __be16 sport, __be16 dport,
313 struct udp_table *udptable)
314 {
315 struct sock *sk;
316 const struct ipv6hdr *iph = ipv6_hdr(skb);
317
318 if (unlikely(sk = skb_steal_sock(skb)))
319 return sk;
320 return __udp6_lib_lookup(dev_net(skb_dst(skb)->dev), &iph->saddr, sport,
321 &iph->daddr, dport, inet6_iif(skb),
322 udptable);
323 }
324
325 struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport,
326 const struct in6_addr *daddr, __be16 dport, int dif)
327 {
328 return __udp6_lib_lookup(net, saddr, sport, daddr, dport, dif, &udp_table);
329 }
330 EXPORT_SYMBOL_GPL(udp6_lib_lookup);
331
332
333 /*
334 * This should be easy, if there is something there we
335 * return it, otherwise we block.
336 */
337
338 int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
339 struct msghdr *msg, size_t len,
340 int noblock, int flags, int *addr_len)
341 {
342 struct ipv6_pinfo *np = inet6_sk(sk);
343 struct inet_sock *inet = inet_sk(sk);
344 struct sk_buff *skb;
345 unsigned int ulen, copied;
346 int peeked, off = 0;
347 int err;
348 int is_udplite = IS_UDPLITE(sk);
349 int is_udp4;
350 bool slow;
351
352 if (addr_len)
353 *addr_len = sizeof(struct sockaddr_in6);
354
355 if (flags & MSG_ERRQUEUE)
356 return ipv6_recv_error(sk, msg, len);
357
358 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
359 return ipv6_recv_rxpmtu(sk, msg, len);
360
361 try_again:
362 skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),
363 &peeked, &off, &err);
364 if (!skb)
365 goto out;
366
367 ulen = skb->len - sizeof(struct udphdr);
368 copied = len;
369 if (copied > ulen)
370 copied = ulen;
371 else if (copied < ulen)
372 msg->msg_flags |= MSG_TRUNC;
373
374 is_udp4 = (skb->protocol == htons(ETH_P_IP));
375
376 /*
377 * If checksum is needed at all, try to do it while copying the
378 * data. If the data is truncated, or if we only want a partial
379 * coverage checksum (UDP-Lite), do it before the copy.
380 */
381
382 if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) {
383 if (udp_lib_checksum_complete(skb))
384 goto csum_copy_err;
385 }
386
387 if (skb_csum_unnecessary(skb))
388 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr),
389 msg->msg_iov, copied);
390 else {
391 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
392 if (err == -EINVAL)
393 goto csum_copy_err;
394 }
395 if (unlikely(err)) {
396 trace_kfree_skb(skb, udpv6_recvmsg);
397 if (!peeked) {
398 atomic_inc(&sk->sk_drops);
399 if (is_udp4)
400 UDP_INC_STATS_USER(sock_net(sk),
401 UDP_MIB_INERRORS,
402 is_udplite);
403 else
404 UDP6_INC_STATS_USER(sock_net(sk),
405 UDP_MIB_INERRORS,
406 is_udplite);
407 }
408 goto out_free;
409 }
410 if (!peeked) {
411 if (is_udp4)
412 UDP_INC_STATS_USER(sock_net(sk),
413 UDP_MIB_INDATAGRAMS, is_udplite);
414 else
415 UDP6_INC_STATS_USER(sock_net(sk),
416 UDP_MIB_INDATAGRAMS, is_udplite);
417 }
418
419 sock_recv_ts_and_drops(msg, sk, skb);
420
421 /* Copy the address. */
422 if (msg->msg_name) {
423 struct sockaddr_in6 *sin6;
424
425 sin6 = (struct sockaddr_in6 *) msg->msg_name;
426 sin6->sin6_family = AF_INET6;
427 sin6->sin6_port = udp_hdr(skb)->source;
428 sin6->sin6_flowinfo = 0;
429 sin6->sin6_scope_id = 0;
430
431 if (is_udp4)
432 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
433 &sin6->sin6_addr);
434 else {
435 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
436 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
437 sin6->sin6_scope_id = IP6CB(skb)->iif;
438 }
439
440 }
441 if (is_udp4) {
442 if (inet->cmsg_flags)
443 ip_cmsg_recv(msg, skb);
444 } else {
445 if (np->rxopt.all)
446 datagram_recv_ctl(sk, msg, skb);
447 }
448
449 err = copied;
450 if (flags & MSG_TRUNC)
451 err = ulen;
452
453 out_free:
454 skb_free_datagram_locked(sk, skb);
455 out:
456 return err;
457
458 csum_copy_err:
459 slow = lock_sock_fast(sk);
460 if (!skb_kill_datagram(sk, skb, flags)) {
461 if (is_udp4)
462 UDP_INC_STATS_USER(sock_net(sk),
463 UDP_MIB_INERRORS, is_udplite);
464 else
465 UDP6_INC_STATS_USER(sock_net(sk),
466 UDP_MIB_INERRORS, is_udplite);
467 }
468 unlock_sock_fast(sk, slow);
469
470 if (noblock)
471 return -EAGAIN;
472
473 /* starting over for a new packet */
474 msg->msg_flags &= ~MSG_TRUNC;
475 goto try_again;
476 }
477
478 void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
479 u8 type, u8 code, int offset, __be32 info,
480 struct udp_table *udptable)
481 {
482 struct ipv6_pinfo *np;
483 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
484 const struct in6_addr *saddr = &hdr->saddr;
485 const struct in6_addr *daddr = &hdr->daddr;
486 struct udphdr *uh = (struct udphdr*)(skb->data+offset);
487 struct sock *sk;
488 int err;
489
490 sk = __udp6_lib_lookup(dev_net(skb->dev), daddr, uh->dest,
491 saddr, uh->source, inet6_iif(skb), udptable);
492 if (sk == NULL)
493 return;
494
495 if (type == ICMPV6_PKT_TOOBIG)
496 ip6_sk_update_pmtu(skb, sk, info);
497 if (type == NDISC_REDIRECT)
498 ip6_sk_redirect(skb, sk);
499
500 np = inet6_sk(sk);
501
502 if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
503 goto out;
504
505 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
506 goto out;
507
508 if (np->recverr)
509 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
510
511 sk->sk_err = err;
512 sk->sk_error_report(sk);
513 out:
514 sock_put(sk);
515 }
516
517 static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
518 {
519 int rc;
520
521 if (!ipv6_addr_any(&inet6_sk(sk)->daddr))
522 sock_rps_save_rxhash(sk, skb);
523
524 rc = sock_queue_rcv_skb(sk, skb);
525 if (rc < 0) {
526 int is_udplite = IS_UDPLITE(sk);
527
528 /* Note that an ENOMEM error is charged twice */
529 if (rc == -ENOMEM)
530 UDP6_INC_STATS_BH(sock_net(sk),
531 UDP_MIB_RCVBUFERRORS, is_udplite);
532 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
533 kfree_skb(skb);
534 return -1;
535 }
536 return 0;
537 }
538
539 static __inline__ void udpv6_err(struct sk_buff *skb,
540 struct inet6_skb_parm *opt, u8 type,
541 u8 code, int offset, __be32 info )
542 {
543 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table);
544 }
545
546 static struct static_key udpv6_encap_needed __read_mostly;
547 void udpv6_encap_enable(void)
548 {
549 if (!static_key_enabled(&udpv6_encap_needed))
550 static_key_slow_inc(&udpv6_encap_needed);
551 }
552 EXPORT_SYMBOL(udpv6_encap_enable);
553
554 int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
555 {
556 struct udp_sock *up = udp_sk(sk);
557 int rc;
558 int is_udplite = IS_UDPLITE(sk);
559
560 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
561 goto drop;
562
563 if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
564 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
565
566 /*
567 * This is an encapsulation socket so pass the skb to
568 * the socket's udp_encap_rcv() hook. Otherwise, just
569 * fall through and pass this up the UDP socket.
570 * up->encap_rcv() returns the following value:
571 * =0 if skb was successfully passed to the encap
572 * handler or was discarded by it.
573 * >0 if skb should be passed on to UDP.
574 * <0 if skb should be resubmitted as proto -N
575 */
576
577 /* if we're overly short, let UDP handle it */
578 encap_rcv = ACCESS_ONCE(up->encap_rcv);
579 if (skb->len > sizeof(struct udphdr) && encap_rcv != NULL) {
580 int ret;
581
582 ret = encap_rcv(sk, skb);
583 if (ret <= 0) {
584 UDP_INC_STATS_BH(sock_net(sk),
585 UDP_MIB_INDATAGRAMS,
586 is_udplite);
587 return -ret;
588 }
589 }
590
591 /* FALLTHROUGH -- it's a UDP Packet */
592 }
593
594 /*
595 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
596 */
597 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
598
599 if (up->pcrlen == 0) { /* full coverage was set */
600 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage"
601 " %d while full coverage %d requested\n",
602 UDP_SKB_CB(skb)->cscov, skb->len);
603 goto drop;
604 }
605 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
606 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d "
607 "too small, need min %d\n",
608 UDP_SKB_CB(skb)->cscov, up->pcrlen);
609 goto drop;
610 }
611 }
612
613 if (rcu_access_pointer(sk->sk_filter)) {
614 if (udp_lib_checksum_complete(skb))
615 goto drop;
616 }
617
618 if (sk_rcvqueues_full(sk, skb, sk->sk_rcvbuf))
619 goto drop;
620
621 skb_dst_drop(skb);
622
623 bh_lock_sock(sk);
624 rc = 0;
625 if (!sock_owned_by_user(sk))
626 rc = __udpv6_queue_rcv_skb(sk, skb);
627 else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
628 bh_unlock_sock(sk);
629 goto drop;
630 }
631 bh_unlock_sock(sk);
632
633 return rc;
634 drop:
635 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
636 atomic_inc(&sk->sk_drops);
637 kfree_skb(skb);
638 return -1;
639 }
640
641 static struct sock *udp_v6_mcast_next(struct net *net, struct sock *sk,
642 __be16 loc_port, const struct in6_addr *loc_addr,
643 __be16 rmt_port, const struct in6_addr *rmt_addr,
644 int dif)
645 {
646 struct hlist_nulls_node *node;
647 struct sock *s = sk;
648 unsigned short num = ntohs(loc_port);
649
650 sk_nulls_for_each_from(s, node) {
651 struct inet_sock *inet = inet_sk(s);
652
653 if (!net_eq(sock_net(s), net))
654 continue;
655
656 if (udp_sk(s)->udp_port_hash == num &&
657 s->sk_family == PF_INET6) {
658 struct ipv6_pinfo *np = inet6_sk(s);
659 if (inet->inet_dport) {
660 if (inet->inet_dport != rmt_port)
661 continue;
662 }
663 if (!ipv6_addr_any(&np->daddr) &&
664 !ipv6_addr_equal(&np->daddr, rmt_addr))
665 continue;
666
667 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)
668 continue;
669
670 if (!ipv6_addr_any(&np->rcv_saddr)) {
671 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr))
672 continue;
673 }
674 if (!inet6_mc_check(s, loc_addr, rmt_addr))
675 continue;
676 return s;
677 }
678 }
679 return NULL;
680 }
681
682 static void flush_stack(struct sock **stack, unsigned int count,
683 struct sk_buff *skb, unsigned int final)
684 {
685 struct sk_buff *skb1 = NULL;
686 struct sock *sk;
687 unsigned int i;
688
689 for (i = 0; i < count; i++) {
690 sk = stack[i];
691 if (likely(skb1 == NULL))
692 skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC);
693 if (!skb1) {
694 atomic_inc(&sk->sk_drops);
695 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS,
696 IS_UDPLITE(sk));
697 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS,
698 IS_UDPLITE(sk));
699 }
700
701 if (skb1 && udpv6_queue_rcv_skb(sk, skb1) <= 0)
702 skb1 = NULL;
703 }
704 if (unlikely(skb1))
705 kfree_skb(skb1);
706 }
707 /*
708 * Note: called only from the BH handler context,
709 * so we don't need to lock the hashes.
710 */
711 static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
712 const struct in6_addr *saddr, const struct in6_addr *daddr,
713 struct udp_table *udptable)
714 {
715 struct sock *sk, *stack[256 / sizeof(struct sock *)];
716 const struct udphdr *uh = udp_hdr(skb);
717 struct udp_hslot *hslot = udp_hashslot(udptable, net, ntohs(uh->dest));
718 int dif;
719 unsigned int i, count = 0;
720
721 spin_lock(&hslot->lock);
722 sk = sk_nulls_head(&hslot->head);
723 dif = inet6_iif(skb);
724 sk = udp_v6_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif);
725 while (sk) {
726 stack[count++] = sk;
727 sk = udp_v6_mcast_next(net, sk_nulls_next(sk), uh->dest, daddr,
728 uh->source, saddr, dif);
729 if (unlikely(count == ARRAY_SIZE(stack))) {
730 if (!sk)
731 break;
732 flush_stack(stack, count, skb, ~0);
733 count = 0;
734 }
735 }
736 /*
737 * before releasing the lock, we must take reference on sockets
738 */
739 for (i = 0; i < count; i++)
740 sock_hold(stack[i]);
741
742 spin_unlock(&hslot->lock);
743
744 if (count) {
745 flush_stack(stack, count, skb, count - 1);
746
747 for (i = 0; i < count; i++)
748 sock_put(stack[i]);
749 } else {
750 kfree_skb(skb);
751 }
752 return 0;
753 }
754
755 int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
756 int proto)
757 {
758 struct net *net = dev_net(skb->dev);
759 struct sock *sk;
760 struct udphdr *uh;
761 const struct in6_addr *saddr, *daddr;
762 u32 ulen = 0;
763
764 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
765 goto discard;
766
767 saddr = &ipv6_hdr(skb)->saddr;
768 daddr = &ipv6_hdr(skb)->daddr;
769 uh = udp_hdr(skb);
770
771 ulen = ntohs(uh->len);
772 if (ulen > skb->len)
773 goto short_packet;
774
775 if (proto == IPPROTO_UDP) {
776 /* UDP validates ulen. */
777
778 /* Check for jumbo payload */
779 if (ulen == 0)
780 ulen = skb->len;
781
782 if (ulen < sizeof(*uh))
783 goto short_packet;
784
785 if (ulen < skb->len) {
786 if (pskb_trim_rcsum(skb, ulen))
787 goto short_packet;
788 saddr = &ipv6_hdr(skb)->saddr;
789 daddr = &ipv6_hdr(skb)->daddr;
790 uh = udp_hdr(skb);
791 }
792 }
793
794 if (udp6_csum_init(skb, uh, proto))
795 goto discard;
796
797 /*
798 * Multicast receive code
799 */
800 if (ipv6_addr_is_multicast(daddr))
801 return __udp6_lib_mcast_deliver(net, skb,
802 saddr, daddr, udptable);
803
804 /* Unicast */
805
806 /*
807 * check socket cache ... must talk to Alan about his plans
808 * for sock caches... i'll skip this for now.
809 */
810 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
811 if (sk != NULL) {
812 int ret = udpv6_queue_rcv_skb(sk, skb);
813 sock_put(sk);
814
815 /* a return value > 0 means to resubmit the input, but
816 * it wants the return to be -protocol, or 0
817 */
818 if (ret > 0)
819 return -ret;
820
821 return 0;
822 }
823
824 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
825 goto discard;
826
827 if (udp_lib_checksum_complete(skb))
828 goto discard;
829
830 UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
831 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
832
833 kfree_skb(skb);
834 return 0;
835
836 short_packet:
837 LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n",
838 proto == IPPROTO_UDPLITE ? "-Lite" : "",
839 saddr,
840 ntohs(uh->source),
841 ulen,
842 skb->len,
843 daddr,
844 ntohs(uh->dest));
845
846 discard:
847 UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
848 kfree_skb(skb);
849 return 0;
850 }
851
852 static __inline__ int udpv6_rcv(struct sk_buff *skb)
853 {
854 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP);
855 }
856
857 /*
858 * Throw away all pending data and cancel the corking. Socket is locked.
859 */
860 static void udp_v6_flush_pending_frames(struct sock *sk)
861 {
862 struct udp_sock *up = udp_sk(sk);
863
864 if (up->pending == AF_INET)
865 udp_flush_pending_frames(sk);
866 else if (up->pending) {
867 up->len = 0;
868 up->pending = 0;
869 ip6_flush_pending_frames(sk);
870 }
871 }
872
873 /**
874 * udp6_hwcsum_outgoing - handle outgoing HW checksumming
875 * @sk: socket we are sending on
876 * @skb: sk_buff containing the filled-in UDP header
877 * (checksum field must be zeroed out)
878 */
879 static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
880 const struct in6_addr *saddr,
881 const struct in6_addr *daddr, int len)
882 {
883 unsigned int offset;
884 struct udphdr *uh = udp_hdr(skb);
885 __wsum csum = 0;
886
887 if (skb_queue_len(&sk->sk_write_queue) == 1) {
888 /* Only one fragment on the socket. */
889 skb->csum_start = skb_transport_header(skb) - skb->head;
890 skb->csum_offset = offsetof(struct udphdr, check);
891 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0);
892 } else {
893 /*
894 * HW-checksum won't work as there are two or more
895 * fragments on the socket so that all csums of sk_buffs
896 * should be together
897 */
898 offset = skb_transport_offset(skb);
899 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
900
901 skb->ip_summed = CHECKSUM_NONE;
902
903 skb_queue_walk(&sk->sk_write_queue, skb) {
904 csum = csum_add(csum, skb->csum);
905 }
906
907 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP,
908 csum);
909 if (uh->check == 0)
910 uh->check = CSUM_MANGLED_0;
911 }
912 }
913
914 /*
915 * Sending
916 */
917
918 static int udp_v6_push_pending_frames(struct sock *sk)
919 {
920 struct sk_buff *skb;
921 struct udphdr *uh;
922 struct udp_sock *up = udp_sk(sk);
923 struct inet_sock *inet = inet_sk(sk);
924 struct flowi6 *fl6 = &inet->cork.fl.u.ip6;
925 int err = 0;
926 int is_udplite = IS_UDPLITE(sk);
927 __wsum csum = 0;
928
929 /* Grab the skbuff where UDP header space exists. */
930 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
931 goto out;
932
933 /*
934 * Create a UDP header
935 */
936 uh = udp_hdr(skb);
937 uh->source = fl6->fl6_sport;
938 uh->dest = fl6->fl6_dport;
939 uh->len = htons(up->len);
940 uh->check = 0;
941
942 if (is_udplite)
943 csum = udplite_csum_outgoing(sk, skb);
944 else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
945 udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr,
946 up->len);
947 goto send;
948 } else
949 csum = udp_csum_outgoing(sk, skb);
950
951 /* add protocol-dependent pseudo-header */
952 uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
953 up->len, fl6->flowi6_proto, csum);
954 if (uh->check == 0)
955 uh->check = CSUM_MANGLED_0;
956
957 send:
958 err = ip6_push_pending_frames(sk);
959 if (err) {
960 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) {
961 UDP6_INC_STATS_USER(sock_net(sk),
962 UDP_MIB_SNDBUFERRORS, is_udplite);
963 err = 0;
964 }
965 } else
966 UDP6_INC_STATS_USER(sock_net(sk),
967 UDP_MIB_OUTDATAGRAMS, is_udplite);
968 out:
969 up->len = 0;
970 up->pending = 0;
971 return err;
972 }
973
974 int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
975 struct msghdr *msg, size_t len)
976 {
977 struct ipv6_txoptions opt_space;
978 struct udp_sock *up = udp_sk(sk);
979 struct inet_sock *inet = inet_sk(sk);
980 struct ipv6_pinfo *np = inet6_sk(sk);
981 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
982 struct in6_addr *daddr, *final_p, final;
983 struct ipv6_txoptions *opt = NULL;
984 struct ip6_flowlabel *flowlabel = NULL;
985 struct flowi6 fl6;
986 struct dst_entry *dst;
987 int addr_len = msg->msg_namelen;
988 int ulen = len;
989 int hlimit = -1;
990 int tclass = -1;
991 int dontfrag = -1;
992 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
993 int err;
994 int connected = 0;
995 int is_udplite = IS_UDPLITE(sk);
996 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
997
998 /* destination address check */
999 if (sin6) {
1000 if (addr_len < offsetof(struct sockaddr, sa_data))
1001 return -EINVAL;
1002
1003 switch (sin6->sin6_family) {
1004 case AF_INET6:
1005 if (addr_len < SIN6_LEN_RFC2133)
1006 return -EINVAL;
1007 daddr = &sin6->sin6_addr;
1008 break;
1009 case AF_INET:
1010 goto do_udp_sendmsg;
1011 case AF_UNSPEC:
1012 msg->msg_name = sin6 = NULL;
1013 msg->msg_namelen = addr_len = 0;
1014 daddr = NULL;
1015 break;
1016 default:
1017 return -EINVAL;
1018 }
1019 } else if (!up->pending) {
1020 if (sk->sk_state != TCP_ESTABLISHED)
1021 return -EDESTADDRREQ;
1022 daddr = &np->daddr;
1023 } else
1024 daddr = NULL;
1025
1026 if (daddr) {
1027 if (ipv6_addr_v4mapped(daddr)) {
1028 struct sockaddr_in sin;
1029 sin.sin_family = AF_INET;
1030 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport;
1031 sin.sin_addr.s_addr = daddr->s6_addr32[3];
1032 msg->msg_name = &sin;
1033 msg->msg_namelen = sizeof(sin);
1034 do_udp_sendmsg:
1035 if (__ipv6_only_sock(sk))
1036 return -ENETUNREACH;
1037 return udp_sendmsg(iocb, sk, msg, len);
1038 }
1039 }
1040
1041 if (up->pending == AF_INET)
1042 return udp_sendmsg(iocb, sk, msg, len);
1043
1044 /* Rough check on arithmetic overflow,
1045 better check is made in ip6_append_data().
1046 */
1047 if (len > INT_MAX - sizeof(struct udphdr))
1048 return -EMSGSIZE;
1049
1050 if (up->pending) {
1051 /*
1052 * There are pending frames.
1053 * The socket lock must be held while it's corked.
1054 */
1055 lock_sock(sk);
1056 if (likely(up->pending)) {
1057 if (unlikely(up->pending != AF_INET6)) {
1058 release_sock(sk);
1059 return -EAFNOSUPPORT;
1060 }
1061 dst = NULL;
1062 goto do_append_data;
1063 }
1064 release_sock(sk);
1065 }
1066 ulen += sizeof(struct udphdr);
1067
1068 memset(&fl6, 0, sizeof(fl6));
1069
1070 if (sin6) {
1071 if (sin6->sin6_port == 0)
1072 return -EINVAL;
1073
1074 fl6.fl6_dport = sin6->sin6_port;
1075 daddr = &sin6->sin6_addr;
1076
1077 if (np->sndflow) {
1078 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
1079 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
1080 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1081 if (flowlabel == NULL)
1082 return -EINVAL;
1083 daddr = &flowlabel->dst;
1084 }
1085 }
1086
1087 /*
1088 * Otherwise it will be difficult to maintain
1089 * sk->sk_dst_cache.
1090 */
1091 if (sk->sk_state == TCP_ESTABLISHED &&
1092 ipv6_addr_equal(daddr, &np->daddr))
1093 daddr = &np->daddr;
1094
1095 if (addr_len >= sizeof(struct sockaddr_in6) &&
1096 sin6->sin6_scope_id &&
1097 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
1098 fl6.flowi6_oif = sin6->sin6_scope_id;
1099 } else {
1100 if (sk->sk_state != TCP_ESTABLISHED)
1101 return -EDESTADDRREQ;
1102
1103 fl6.fl6_dport = inet->inet_dport;
1104 daddr = &np->daddr;
1105 fl6.flowlabel = np->flow_label;
1106 connected = 1;
1107 }
1108
1109 if (!fl6.flowi6_oif)
1110 fl6.flowi6_oif = sk->sk_bound_dev_if;
1111
1112 if (!fl6.flowi6_oif)
1113 fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex;
1114
1115 fl6.flowi6_mark = sk->sk_mark;
1116
1117 if (msg->msg_controllen) {
1118 opt = &opt_space;
1119 memset(opt, 0, sizeof(struct ipv6_txoptions));
1120 opt->tot_len = sizeof(*opt);
1121
1122 err = datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt,
1123 &hlimit, &tclass, &dontfrag);
1124 if (err < 0) {
1125 fl6_sock_release(flowlabel);
1126 return err;
1127 }
1128 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
1129 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1130 if (flowlabel == NULL)
1131 return -EINVAL;
1132 }
1133 if (!(opt->opt_nflen|opt->opt_flen))
1134 opt = NULL;
1135 connected = 0;
1136 }
1137 if (opt == NULL)
1138 opt = np->opt;
1139 if (flowlabel)
1140 opt = fl6_merge_options(&opt_space, flowlabel, opt);
1141 opt = ipv6_fixup_options(&opt_space, opt);
1142
1143 fl6.flowi6_proto = sk->sk_protocol;
1144 if (!ipv6_addr_any(daddr))
1145 fl6.daddr = *daddr;
1146 else
1147 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
1148 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
1149 fl6.saddr = np->saddr;
1150 fl6.fl6_sport = inet->inet_sport;
1151
1152 final_p = fl6_update_dst(&fl6, opt, &final);
1153 if (final_p)
1154 connected = 0;
1155
1156 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) {
1157 fl6.flowi6_oif = np->mcast_oif;
1158 connected = 0;
1159 } else if (!fl6.flowi6_oif)
1160 fl6.flowi6_oif = np->ucast_oif;
1161
1162 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
1163
1164 dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p, true);
1165 if (IS_ERR(dst)) {
1166 err = PTR_ERR(dst);
1167 dst = NULL;
1168 goto out;
1169 }
1170
1171 if (hlimit < 0) {
1172 if (ipv6_addr_is_multicast(&fl6.daddr))
1173 hlimit = np->mcast_hops;
1174 else
1175 hlimit = np->hop_limit;
1176 if (hlimit < 0)
1177 hlimit = ip6_dst_hoplimit(dst);
1178 }
1179
1180 if (tclass < 0)
1181 tclass = np->tclass;
1182
1183 if (dontfrag < 0)
1184 dontfrag = np->dontfrag;
1185
1186 if (msg->msg_flags&MSG_CONFIRM)
1187 goto do_confirm;
1188 back_from_confirm:
1189
1190 lock_sock(sk);
1191 if (unlikely(up->pending)) {
1192 /* The socket is already corked while preparing it. */
1193 /* ... which is an evident application bug. --ANK */
1194 release_sock(sk);
1195
1196 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
1197 err = -EINVAL;
1198 goto out;
1199 }
1200
1201 up->pending = AF_INET6;
1202
1203 do_append_data:
1204 up->len += ulen;
1205 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
1206 err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen,
1207 sizeof(struct udphdr), hlimit, tclass, opt, &fl6,
1208 (struct rt6_info*)dst,
1209 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, dontfrag);
1210 if (err)
1211 udp_v6_flush_pending_frames(sk);
1212 else if (!corkreq)
1213 err = udp_v6_push_pending_frames(sk);
1214 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
1215 up->pending = 0;
1216
1217 if (dst) {
1218 if (connected) {
1219 ip6_dst_store(sk, dst,
1220 ipv6_addr_equal(&fl6.daddr, &np->daddr) ?
1221 &np->daddr : NULL,
1222 #ifdef CONFIG_IPV6_SUBTREES
1223 ipv6_addr_equal(&fl6.saddr, &np->saddr) ?
1224 &np->saddr :
1225 #endif
1226 NULL);
1227 } else {
1228 dst_release(dst);
1229 }
1230 dst = NULL;
1231 }
1232
1233 if (err > 0)
1234 err = np->recverr ? net_xmit_errno(err) : 0;
1235 release_sock(sk);
1236 out:
1237 dst_release(dst);
1238 fl6_sock_release(flowlabel);
1239 if (!err)
1240 return len;
1241 /*
1242 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
1243 * ENOBUFS might not be good (it's not tunable per se), but otherwise
1244 * we don't have a good statistic (IpOutDiscards but it can be too many
1245 * things). We could add another new stat but at least for now that
1246 * seems like overkill.
1247 */
1248 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
1249 UDP6_INC_STATS_USER(sock_net(sk),
1250 UDP_MIB_SNDBUFERRORS, is_udplite);
1251 }
1252 return err;
1253
1254 do_confirm:
1255 dst_confirm(dst);
1256 if (!(msg->msg_flags&MSG_PROBE) || len)
1257 goto back_from_confirm;
1258 err = 0;
1259 goto out;
1260 }
1261
1262 void udpv6_destroy_sock(struct sock *sk)
1263 {
1264 lock_sock(sk);
1265 udp_v6_flush_pending_frames(sk);
1266 release_sock(sk);
1267
1268 inet6_destroy_sock(sk);
1269 }
1270
1271 /*
1272 * Socket option code for UDP
1273 */
1274 int udpv6_setsockopt(struct sock *sk, int level, int optname,
1275 char __user *optval, unsigned int optlen)
1276 {
1277 if (level == SOL_UDP || level == SOL_UDPLITE)
1278 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1279 udp_v6_push_pending_frames);
1280 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1281 }
1282
1283 #ifdef CONFIG_COMPAT
1284 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
1285 char __user *optval, unsigned int optlen)
1286 {
1287 if (level == SOL_UDP || level == SOL_UDPLITE)
1288 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1289 udp_v6_push_pending_frames);
1290 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
1291 }
1292 #endif
1293
1294 int udpv6_getsockopt(struct sock *sk, int level, int optname,
1295 char __user *optval, int __user *optlen)
1296 {
1297 if (level == SOL_UDP || level == SOL_UDPLITE)
1298 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1299 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1300 }
1301
1302 #ifdef CONFIG_COMPAT
1303 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
1304 char __user *optval, int __user *optlen)
1305 {
1306 if (level == SOL_UDP || level == SOL_UDPLITE)
1307 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1308 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
1309 }
1310 #endif
1311
1312 static const struct inet6_protocol udpv6_protocol = {
1313 .handler = udpv6_rcv,
1314 .err_handler = udpv6_err,
1315 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1316 };
1317
1318 /* ------------------------------------------------------------------------ */
1319 #ifdef CONFIG_PROC_FS
1320
1321 static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket)
1322 {
1323 struct inet_sock *inet = inet_sk(sp);
1324 struct ipv6_pinfo *np = inet6_sk(sp);
1325 const struct in6_addr *dest, *src;
1326 __u16 destp, srcp;
1327
1328 dest = &np->daddr;
1329 src = &np->rcv_saddr;
1330 destp = ntohs(inet->inet_dport);
1331 srcp = ntohs(inet->inet_sport);
1332 seq_printf(seq,
1333 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1334 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %d\n",
1335 bucket,
1336 src->s6_addr32[0], src->s6_addr32[1],
1337 src->s6_addr32[2], src->s6_addr32[3], srcp,
1338 dest->s6_addr32[0], dest->s6_addr32[1],
1339 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1340 sp->sk_state,
1341 sk_wmem_alloc_get(sp),
1342 sk_rmem_alloc_get(sp),
1343 0, 0L, 0,
1344 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)),
1345 0,
1346 sock_i_ino(sp),
1347 atomic_read(&sp->sk_refcnt), sp,
1348 atomic_read(&sp->sk_drops));
1349 }
1350
1351 int udp6_seq_show(struct seq_file *seq, void *v)
1352 {
1353 if (v == SEQ_START_TOKEN)
1354 seq_printf(seq,
1355 " sl "
1356 "local_address "
1357 "remote_address "
1358 "st tx_queue rx_queue tr tm->when retrnsmt"
1359 " uid timeout inode ref pointer drops\n");
1360 else
1361 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket);
1362 return 0;
1363 }
1364
1365 static const struct file_operations udp6_afinfo_seq_fops = {
1366 .owner = THIS_MODULE,
1367 .open = udp_seq_open,
1368 .read = seq_read,
1369 .llseek = seq_lseek,
1370 .release = seq_release_net
1371 };
1372
1373 static struct udp_seq_afinfo udp6_seq_afinfo = {
1374 .name = "udp6",
1375 .family = AF_INET6,
1376 .udp_table = &udp_table,
1377 .seq_fops = &udp6_afinfo_seq_fops,
1378 .seq_ops = {
1379 .show = udp6_seq_show,
1380 },
1381 };
1382
1383 int __net_init udp6_proc_init(struct net *net)
1384 {
1385 return udp_proc_register(net, &udp6_seq_afinfo);
1386 }
1387
1388 void udp6_proc_exit(struct net *net) {
1389 udp_proc_unregister(net, &udp6_seq_afinfo);
1390 }
1391 #endif /* CONFIG_PROC_FS */
1392
1393 /* ------------------------------------------------------------------------ */
1394
1395 struct proto udpv6_prot = {
1396 .name = "UDPv6",
1397 .owner = THIS_MODULE,
1398 .close = udp_lib_close,
1399 .connect = ip6_datagram_connect,
1400 .disconnect = udp_disconnect,
1401 .ioctl = udp_ioctl,
1402 .destroy = udpv6_destroy_sock,
1403 .setsockopt = udpv6_setsockopt,
1404 .getsockopt = udpv6_getsockopt,
1405 .sendmsg = udpv6_sendmsg,
1406 .recvmsg = udpv6_recvmsg,
1407 .backlog_rcv = __udpv6_queue_rcv_skb,
1408 .hash = udp_lib_hash,
1409 .unhash = udp_lib_unhash,
1410 .rehash = udp_v6_rehash,
1411 .get_port = udp_v6_get_port,
1412 .memory_allocated = &udp_memory_allocated,
1413 .sysctl_mem = sysctl_udp_mem,
1414 .sysctl_wmem = &sysctl_udp_wmem_min,
1415 .sysctl_rmem = &sysctl_udp_rmem_min,
1416 .obj_size = sizeof(struct udp6_sock),
1417 .slab_flags = SLAB_DESTROY_BY_RCU,
1418 .h.udp_table = &udp_table,
1419 #ifdef CONFIG_COMPAT
1420 .compat_setsockopt = compat_udpv6_setsockopt,
1421 .compat_getsockopt = compat_udpv6_getsockopt,
1422 #endif
1423 .clear_sk = sk_prot_clear_portaddr_nulls,
1424 };
1425
1426 static struct inet_protosw udpv6_protosw = {
1427 .type = SOCK_DGRAM,
1428 .protocol = IPPROTO_UDP,
1429 .prot = &udpv6_prot,
1430 .ops = &inet6_dgram_ops,
1431 .no_check = UDP_CSUM_DEFAULT,
1432 .flags = INET_PROTOSW_PERMANENT,
1433 };
1434
1435
1436 int __init udpv6_init(void)
1437 {
1438 int ret;
1439
1440 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
1441 if (ret)
1442 goto out;
1443
1444 ret = inet6_register_protosw(&udpv6_protosw);
1445 if (ret)
1446 goto out_udpv6_protocol;
1447 out:
1448 return ret;
1449
1450 out_udpv6_protocol:
1451 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1452 goto out;
1453 }
1454
1455 void udpv6_exit(void)
1456 {
1457 inet6_unregister_protosw(&udpv6_protosw);
1458 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1459 }
Linux kernel - Deliverables
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