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Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
[GitHub/mt8127/android_kernel_alcatel_ttab.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 #include <net/inet6_hashtables.h>
49
50 #include <linux/proc_fs.h>
51 #include <linux/seq_file.h>
52 #include <trace/events/skb.h>
53 #include "udp_impl.h"
54
55 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
56 {
57 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
58 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
59 __be32 sk1_rcv_saddr = sk_rcv_saddr(sk);
60 __be32 sk2_rcv_saddr = sk_rcv_saddr(sk2);
61 int sk_ipv6only = ipv6_only_sock(sk);
62 int sk2_ipv6only = inet_v6_ipv6only(sk2);
63 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
64 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
65
66 /* if both are mapped, treat as IPv4 */
67 if (addr_type == IPV6_ADDR_MAPPED && addr_type2 == IPV6_ADDR_MAPPED)
68 return (!sk2_ipv6only &&
69 (!sk1_rcv_saddr || !sk2_rcv_saddr ||
70 sk1_rcv_saddr == sk2_rcv_saddr));
71
72 if (addr_type2 == IPV6_ADDR_ANY &&
73 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
74 return 1;
75
76 if (addr_type == IPV6_ADDR_ANY &&
77 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
78 return 1;
79
80 if (sk2_rcv_saddr6 &&
81 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
82 return 1;
83
84 return 0;
85 }
86
87 static unsigned int udp6_portaddr_hash(struct net *net,
88 const struct in6_addr *addr6,
89 unsigned int port)
90 {
91 unsigned int hash, mix = net_hash_mix(net);
92
93 if (ipv6_addr_any(addr6))
94 hash = jhash_1word(0, mix);
95 else if (ipv6_addr_v4mapped(addr6))
96 hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix);
97 else
98 hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix);
99
100 return hash ^ port;
101 }
102
103
104 int udp_v6_get_port(struct sock *sk, unsigned short snum)
105 {
106 unsigned int hash2_nulladdr =
107 udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum);
108 unsigned int hash2_partial =
109 udp6_portaddr_hash(sock_net(sk), &inet6_sk(sk)->rcv_saddr, 0);
110
111 /* precompute partial secondary hash */
112 udp_sk(sk)->udp_portaddr_hash = hash2_partial;
113 return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal, hash2_nulladdr);
114 }
115
116 static void udp_v6_rehash(struct sock *sk)
117 {
118 u16 new_hash = udp6_portaddr_hash(sock_net(sk),
119 &inet6_sk(sk)->rcv_saddr,
120 inet_sk(sk)->inet_num);
121
122 udp_lib_rehash(sk, new_hash);
123 }
124
125 static inline int compute_score(struct sock *sk, struct net *net,
126 unsigned short hnum,
127 const struct in6_addr *saddr, __be16 sport,
128 const struct in6_addr *daddr, __be16 dport,
129 int dif)
130 {
131 int score = -1;
132
133 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum &&
134 sk->sk_family == PF_INET6) {
135 struct ipv6_pinfo *np = inet6_sk(sk);
136 struct inet_sock *inet = inet_sk(sk);
137
138 score = 0;
139 if (inet->inet_dport) {
140 if (inet->inet_dport != sport)
141 return -1;
142 score++;
143 }
144 if (!ipv6_addr_any(&np->rcv_saddr)) {
145 if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
146 return -1;
147 score++;
148 }
149 if (!ipv6_addr_any(&np->daddr)) {
150 if (!ipv6_addr_equal(&np->daddr, saddr))
151 return -1;
152 score++;
153 }
154 if (sk->sk_bound_dev_if) {
155 if (sk->sk_bound_dev_if != dif)
156 return -1;
157 score++;
158 }
159 }
160 return score;
161 }
162
163 #define SCORE2_MAX (1 + 1 + 1)
164 static inline int compute_score2(struct sock *sk, struct net *net,
165 const struct in6_addr *saddr, __be16 sport,
166 const struct in6_addr *daddr, unsigned short hnum,
167 int dif)
168 {
169 int score = -1;
170
171 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum &&
172 sk->sk_family == PF_INET6) {
173 struct ipv6_pinfo *np = inet6_sk(sk);
174 struct inet_sock *inet = inet_sk(sk);
175
176 if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
177 return -1;
178 score = 0;
179 if (inet->inet_dport) {
180 if (inet->inet_dport != sport)
181 return -1;
182 score++;
183 }
184 if (!ipv6_addr_any(&np->daddr)) {
185 if (!ipv6_addr_equal(&np->daddr, saddr))
186 return -1;
187 score++;
188 }
189 if (sk->sk_bound_dev_if) {
190 if (sk->sk_bound_dev_if != dif)
191 return -1;
192 score++;
193 }
194 }
195 return score;
196 }
197
198
199 /* called with read_rcu_lock() */
200 static struct sock *udp6_lib_lookup2(struct net *net,
201 const struct in6_addr *saddr, __be16 sport,
202 const struct in6_addr *daddr, unsigned int hnum, int dif,
203 struct udp_hslot *hslot2, unsigned int slot2)
204 {
205 struct sock *sk, *result;
206 struct hlist_nulls_node *node;
207 int score, badness, matches = 0, reuseport = 0;
208 u32 hash = 0;
209
210 begin:
211 result = NULL;
212 badness = -1;
213 udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) {
214 score = compute_score2(sk, net, saddr, sport,
215 daddr, hnum, dif);
216 if (score > badness) {
217 result = sk;
218 badness = score;
219 reuseport = sk->sk_reuseport;
220 if (reuseport) {
221 hash = inet6_ehashfn(net, daddr, hnum,
222 saddr, sport);
223 matches = 1;
224 } else if (score == SCORE2_MAX)
225 goto exact_match;
226 } else if (score == badness && reuseport) {
227 matches++;
228 if (((u64)hash * matches) >> 32 == 0)
229 result = sk;
230 hash = next_pseudo_random32(hash);
231 }
232 }
233 /*
234 * if the nulls value we got at the end of this lookup is
235 * not the expected one, we must restart lookup.
236 * We probably met an item that was moved to another chain.
237 */
238 if (get_nulls_value(node) != slot2)
239 goto begin;
240
241 if (result) {
242 exact_match:
243 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
244 result = NULL;
245 else if (unlikely(compute_score2(result, net, saddr, sport,
246 daddr, hnum, dif) < badness)) {
247 sock_put(result);
248 goto begin;
249 }
250 }
251 return result;
252 }
253
254 struct sock *__udp6_lib_lookup(struct net *net,
255 const struct in6_addr *saddr, __be16 sport,
256 const struct in6_addr *daddr, __be16 dport,
257 int dif, struct udp_table *udptable)
258 {
259 struct sock *sk, *result;
260 struct hlist_nulls_node *node;
261 unsigned short hnum = ntohs(dport);
262 unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask);
263 struct udp_hslot *hslot2, *hslot = &udptable->hash[slot];
264 int score, badness, matches = 0, reuseport = 0;
265 u32 hash = 0;
266
267 rcu_read_lock();
268 if (hslot->count > 10) {
269 hash2 = udp6_portaddr_hash(net, daddr, hnum);
270 slot2 = hash2 & udptable->mask;
271 hslot2 = &udptable->hash2[slot2];
272 if (hslot->count < hslot2->count)
273 goto begin;
274
275 result = udp6_lib_lookup2(net, saddr, sport,
276 daddr, hnum, dif,
277 hslot2, slot2);
278 if (!result) {
279 hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum);
280 slot2 = hash2 & udptable->mask;
281 hslot2 = &udptable->hash2[slot2];
282 if (hslot->count < hslot2->count)
283 goto begin;
284
285 result = udp6_lib_lookup2(net, saddr, sport,
286 &in6addr_any, hnum, dif,
287 hslot2, slot2);
288 }
289 rcu_read_unlock();
290 return result;
291 }
292 begin:
293 result = NULL;
294 badness = -1;
295 sk_nulls_for_each_rcu(sk, node, &hslot->head) {
296 score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif);
297 if (score > badness) {
298 result = sk;
299 badness = score;
300 reuseport = sk->sk_reuseport;
301 if (reuseport) {
302 hash = inet6_ehashfn(net, daddr, hnum,
303 saddr, sport);
304 matches = 1;
305 }
306 } else if (score == badness && reuseport) {
307 matches++;
308 if (((u64)hash * matches) >> 32 == 0)
309 result = sk;
310 hash = next_pseudo_random32(hash);
311 }
312 }
313 /*
314 * if the nulls value we got at the end of this lookup is
315 * not the expected one, we must restart lookup.
316 * We probably met an item that was moved to another chain.
317 */
318 if (get_nulls_value(node) != slot)
319 goto begin;
320
321 if (result) {
322 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
323 result = NULL;
324 else if (unlikely(compute_score(result, net, hnum, saddr, sport,
325 daddr, dport, dif) < badness)) {
326 sock_put(result);
327 goto begin;
328 }
329 }
330 rcu_read_unlock();
331 return result;
332 }
333 EXPORT_SYMBOL_GPL(__udp6_lib_lookup);
334
335 static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb,
336 __be16 sport, __be16 dport,
337 struct udp_table *udptable)
338 {
339 struct sock *sk;
340 const struct ipv6hdr *iph = ipv6_hdr(skb);
341
342 if (unlikely(sk = skb_steal_sock(skb)))
343 return sk;
344 return __udp6_lib_lookup(dev_net(skb_dst(skb)->dev), &iph->saddr, sport,
345 &iph->daddr, dport, inet6_iif(skb),
346 udptable);
347 }
348
349 struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport,
350 const struct in6_addr *daddr, __be16 dport, int dif)
351 {
352 return __udp6_lib_lookup(net, saddr, sport, daddr, dport, dif, &udp_table);
353 }
354 EXPORT_SYMBOL_GPL(udp6_lib_lookup);
355
356
357 /*
358 * This should be easy, if there is something there we
359 * return it, otherwise we block.
360 */
361
362 int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
363 struct msghdr *msg, size_t len,
364 int noblock, int flags, int *addr_len)
365 {
366 struct ipv6_pinfo *np = inet6_sk(sk);
367 struct inet_sock *inet = inet_sk(sk);
368 struct sk_buff *skb;
369 unsigned int ulen, copied;
370 int peeked, off = 0;
371 int err;
372 int is_udplite = IS_UDPLITE(sk);
373 int is_udp4;
374 bool slow;
375
376 if (addr_len)
377 *addr_len = sizeof(struct sockaddr_in6);
378
379 if (flags & MSG_ERRQUEUE)
380 return ipv6_recv_error(sk, msg, len);
381
382 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
383 return ipv6_recv_rxpmtu(sk, msg, len);
384
385 try_again:
386 skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),
387 &peeked, &off, &err);
388 if (!skb)
389 goto out;
390
391 ulen = skb->len - sizeof(struct udphdr);
392 copied = len;
393 if (copied > ulen)
394 copied = ulen;
395 else if (copied < ulen)
396 msg->msg_flags |= MSG_TRUNC;
397
398 is_udp4 = (skb->protocol == htons(ETH_P_IP));
399
400 /*
401 * If checksum is needed at all, try to do it while copying the
402 * data. If the data is truncated, or if we only want a partial
403 * coverage checksum (UDP-Lite), do it before the copy.
404 */
405
406 if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) {
407 if (udp_lib_checksum_complete(skb))
408 goto csum_copy_err;
409 }
410
411 if (skb_csum_unnecessary(skb))
412 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr),
413 msg->msg_iov, copied);
414 else {
415 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
416 if (err == -EINVAL)
417 goto csum_copy_err;
418 }
419 if (unlikely(err)) {
420 trace_kfree_skb(skb, udpv6_recvmsg);
421 if (!peeked) {
422 atomic_inc(&sk->sk_drops);
423 if (is_udp4)
424 UDP_INC_STATS_USER(sock_net(sk),
425 UDP_MIB_INERRORS,
426 is_udplite);
427 else
428 UDP6_INC_STATS_USER(sock_net(sk),
429 UDP_MIB_INERRORS,
430 is_udplite);
431 }
432 goto out_free;
433 }
434 if (!peeked) {
435 if (is_udp4)
436 UDP_INC_STATS_USER(sock_net(sk),
437 UDP_MIB_INDATAGRAMS, is_udplite);
438 else
439 UDP6_INC_STATS_USER(sock_net(sk),
440 UDP_MIB_INDATAGRAMS, is_udplite);
441 }
442
443 sock_recv_ts_and_drops(msg, sk, skb);
444
445 /* Copy the address. */
446 if (msg->msg_name) {
447 struct sockaddr_in6 *sin6;
448
449 sin6 = (struct sockaddr_in6 *) msg->msg_name;
450 sin6->sin6_family = AF_INET6;
451 sin6->sin6_port = udp_hdr(skb)->source;
452 sin6->sin6_flowinfo = 0;
453
454 if (is_udp4) {
455 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
456 &sin6->sin6_addr);
457 sin6->sin6_scope_id = 0;
458 } else {
459 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
460 sin6->sin6_scope_id =
461 ipv6_iface_scope_id(&sin6->sin6_addr,
462 IP6CB(skb)->iif);
463 }
464
465 }
466 if (is_udp4) {
467 if (inet->cmsg_flags)
468 ip_cmsg_recv(msg, skb);
469 } else {
470 if (np->rxopt.all)
471 ip6_datagram_recv_ctl(sk, msg, skb);
472 }
473
474 err = copied;
475 if (flags & MSG_TRUNC)
476 err = ulen;
477
478 out_free:
479 skb_free_datagram_locked(sk, skb);
480 out:
481 return err;
482
483 csum_copy_err:
484 slow = lock_sock_fast(sk);
485 if (!skb_kill_datagram(sk, skb, flags)) {
486 if (is_udp4) {
487 UDP_INC_STATS_USER(sock_net(sk),
488 UDP_MIB_CSUMERRORS, is_udplite);
489 UDP_INC_STATS_USER(sock_net(sk),
490 UDP_MIB_INERRORS, is_udplite);
491 } else {
492 UDP6_INC_STATS_USER(sock_net(sk),
493 UDP_MIB_CSUMERRORS, is_udplite);
494 UDP6_INC_STATS_USER(sock_net(sk),
495 UDP_MIB_INERRORS, is_udplite);
496 }
497 }
498 unlock_sock_fast(sk, slow);
499
500 if (noblock)
501 return -EAGAIN;
502
503 /* starting over for a new packet */
504 msg->msg_flags &= ~MSG_TRUNC;
505 goto try_again;
506 }
507
508 void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
509 u8 type, u8 code, int offset, __be32 info,
510 struct udp_table *udptable)
511 {
512 struct ipv6_pinfo *np;
513 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
514 const struct in6_addr *saddr = &hdr->saddr;
515 const struct in6_addr *daddr = &hdr->daddr;
516 struct udphdr *uh = (struct udphdr*)(skb->data+offset);
517 struct sock *sk;
518 int err;
519
520 sk = __udp6_lib_lookup(dev_net(skb->dev), daddr, uh->dest,
521 saddr, uh->source, inet6_iif(skb), udptable);
522 if (sk == NULL)
523 return;
524
525 if (type == ICMPV6_PKT_TOOBIG)
526 ip6_sk_update_pmtu(skb, sk, info);
527 if (type == NDISC_REDIRECT)
528 ip6_sk_redirect(skb, sk);
529
530 np = inet6_sk(sk);
531
532 if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
533 goto out;
534
535 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
536 goto out;
537
538 if (np->recverr)
539 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
540
541 sk->sk_err = err;
542 sk->sk_error_report(sk);
543 out:
544 sock_put(sk);
545 }
546
547 static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
548 {
549 int rc;
550
551 if (!ipv6_addr_any(&inet6_sk(sk)->daddr))
552 sock_rps_save_rxhash(sk, skb);
553
554 rc = sock_queue_rcv_skb(sk, skb);
555 if (rc < 0) {
556 int is_udplite = IS_UDPLITE(sk);
557
558 /* Note that an ENOMEM error is charged twice */
559 if (rc == -ENOMEM)
560 UDP6_INC_STATS_BH(sock_net(sk),
561 UDP_MIB_RCVBUFERRORS, is_udplite);
562 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
563 kfree_skb(skb);
564 return -1;
565 }
566 return 0;
567 }
568
569 static __inline__ void udpv6_err(struct sk_buff *skb,
570 struct inet6_skb_parm *opt, u8 type,
571 u8 code, int offset, __be32 info )
572 {
573 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table);
574 }
575
576 static struct static_key udpv6_encap_needed __read_mostly;
577 void udpv6_encap_enable(void)
578 {
579 if (!static_key_enabled(&udpv6_encap_needed))
580 static_key_slow_inc(&udpv6_encap_needed);
581 }
582 EXPORT_SYMBOL(udpv6_encap_enable);
583
584 int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
585 {
586 struct udp_sock *up = udp_sk(sk);
587 int rc;
588 int is_udplite = IS_UDPLITE(sk);
589
590 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
591 goto drop;
592
593 if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
594 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
595
596 /*
597 * This is an encapsulation socket so pass the skb to
598 * the socket's udp_encap_rcv() hook. Otherwise, just
599 * fall through and pass this up the UDP socket.
600 * up->encap_rcv() returns the following value:
601 * =0 if skb was successfully passed to the encap
602 * handler or was discarded by it.
603 * >0 if skb should be passed on to UDP.
604 * <0 if skb should be resubmitted as proto -N
605 */
606
607 /* if we're overly short, let UDP handle it */
608 encap_rcv = ACCESS_ONCE(up->encap_rcv);
609 if (skb->len > sizeof(struct udphdr) && encap_rcv != NULL) {
610 int ret;
611
612 ret = encap_rcv(sk, skb);
613 if (ret <= 0) {
614 UDP_INC_STATS_BH(sock_net(sk),
615 UDP_MIB_INDATAGRAMS,
616 is_udplite);
617 return -ret;
618 }
619 }
620
621 /* FALLTHROUGH -- it's a UDP Packet */
622 }
623
624 /*
625 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
626 */
627 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
628
629 if (up->pcrlen == 0) { /* full coverage was set */
630 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage"
631 " %d while full coverage %d requested\n",
632 UDP_SKB_CB(skb)->cscov, skb->len);
633 goto drop;
634 }
635 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
636 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d "
637 "too small, need min %d\n",
638 UDP_SKB_CB(skb)->cscov, up->pcrlen);
639 goto drop;
640 }
641 }
642
643 if (rcu_access_pointer(sk->sk_filter)) {
644 if (udp_lib_checksum_complete(skb))
645 goto csum_error;
646 }
647
648 if (sk_rcvqueues_full(sk, skb, sk->sk_rcvbuf))
649 goto drop;
650
651 skb_dst_drop(skb);
652
653 bh_lock_sock(sk);
654 rc = 0;
655 if (!sock_owned_by_user(sk))
656 rc = __udpv6_queue_rcv_skb(sk, skb);
657 else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
658 bh_unlock_sock(sk);
659 goto drop;
660 }
661 bh_unlock_sock(sk);
662
663 return rc;
664 csum_error:
665 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite);
666 drop:
667 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
668 atomic_inc(&sk->sk_drops);
669 kfree_skb(skb);
670 return -1;
671 }
672
673 static struct sock *udp_v6_mcast_next(struct net *net, struct sock *sk,
674 __be16 loc_port, const struct in6_addr *loc_addr,
675 __be16 rmt_port, const struct in6_addr *rmt_addr,
676 int dif)
677 {
678 struct hlist_nulls_node *node;
679 struct sock *s = sk;
680 unsigned short num = ntohs(loc_port);
681
682 sk_nulls_for_each_from(s, node) {
683 struct inet_sock *inet = inet_sk(s);
684
685 if (!net_eq(sock_net(s), net))
686 continue;
687
688 if (udp_sk(s)->udp_port_hash == num &&
689 s->sk_family == PF_INET6) {
690 struct ipv6_pinfo *np = inet6_sk(s);
691 if (inet->inet_dport) {
692 if (inet->inet_dport != rmt_port)
693 continue;
694 }
695 if (!ipv6_addr_any(&np->daddr) &&
696 !ipv6_addr_equal(&np->daddr, rmt_addr))
697 continue;
698
699 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)
700 continue;
701
702 if (!ipv6_addr_any(&np->rcv_saddr)) {
703 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr))
704 continue;
705 }
706 if (!inet6_mc_check(s, loc_addr, rmt_addr))
707 continue;
708 return s;
709 }
710 }
711 return NULL;
712 }
713
714 static void flush_stack(struct sock **stack, unsigned int count,
715 struct sk_buff *skb, unsigned int final)
716 {
717 struct sk_buff *skb1 = NULL;
718 struct sock *sk;
719 unsigned int i;
720
721 for (i = 0; i < count; i++) {
722 sk = stack[i];
723 if (likely(skb1 == NULL))
724 skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC);
725 if (!skb1) {
726 atomic_inc(&sk->sk_drops);
727 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS,
728 IS_UDPLITE(sk));
729 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS,
730 IS_UDPLITE(sk));
731 }
732
733 if (skb1 && udpv6_queue_rcv_skb(sk, skb1) <= 0)
734 skb1 = NULL;
735 }
736 if (unlikely(skb1))
737 kfree_skb(skb1);
738 }
739 /*
740 * Note: called only from the BH handler context,
741 * so we don't need to lock the hashes.
742 */
743 static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
744 const struct in6_addr *saddr, const struct in6_addr *daddr,
745 struct udp_table *udptable)
746 {
747 struct sock *sk, *stack[256 / sizeof(struct sock *)];
748 const struct udphdr *uh = udp_hdr(skb);
749 struct udp_hslot *hslot = udp_hashslot(udptable, net, ntohs(uh->dest));
750 int dif;
751 unsigned int i, count = 0;
752
753 spin_lock(&hslot->lock);
754 sk = sk_nulls_head(&hslot->head);
755 dif = inet6_iif(skb);
756 sk = udp_v6_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif);
757 while (sk) {
758 stack[count++] = sk;
759 sk = udp_v6_mcast_next(net, sk_nulls_next(sk), uh->dest, daddr,
760 uh->source, saddr, dif);
761 if (unlikely(count == ARRAY_SIZE(stack))) {
762 if (!sk)
763 break;
764 flush_stack(stack, count, skb, ~0);
765 count = 0;
766 }
767 }
768 /*
769 * before releasing the lock, we must take reference on sockets
770 */
771 for (i = 0; i < count; i++)
772 sock_hold(stack[i]);
773
774 spin_unlock(&hslot->lock);
775
776 if (count) {
777 flush_stack(stack, count, skb, count - 1);
778
779 for (i = 0; i < count; i++)
780 sock_put(stack[i]);
781 } else {
782 kfree_skb(skb);
783 }
784 return 0;
785 }
786
787 int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
788 int proto)
789 {
790 struct net *net = dev_net(skb->dev);
791 struct sock *sk;
792 struct udphdr *uh;
793 const struct in6_addr *saddr, *daddr;
794 u32 ulen = 0;
795
796 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
797 goto discard;
798
799 saddr = &ipv6_hdr(skb)->saddr;
800 daddr = &ipv6_hdr(skb)->daddr;
801 uh = udp_hdr(skb);
802
803 ulen = ntohs(uh->len);
804 if (ulen > skb->len)
805 goto short_packet;
806
807 if (proto == IPPROTO_UDP) {
808 /* UDP validates ulen. */
809
810 /* Check for jumbo payload */
811 if (ulen == 0)
812 ulen = skb->len;
813
814 if (ulen < sizeof(*uh))
815 goto short_packet;
816
817 if (ulen < skb->len) {
818 if (pskb_trim_rcsum(skb, ulen))
819 goto short_packet;
820 saddr = &ipv6_hdr(skb)->saddr;
821 daddr = &ipv6_hdr(skb)->daddr;
822 uh = udp_hdr(skb);
823 }
824 }
825
826 if (udp6_csum_init(skb, uh, proto))
827 goto csum_error;
828
829 /*
830 * Multicast receive code
831 */
832 if (ipv6_addr_is_multicast(daddr))
833 return __udp6_lib_mcast_deliver(net, skb,
834 saddr, daddr, udptable);
835
836 /* Unicast */
837
838 /*
839 * check socket cache ... must talk to Alan about his plans
840 * for sock caches... i'll skip this for now.
841 */
842 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
843 if (sk != NULL) {
844 int ret = udpv6_queue_rcv_skb(sk, skb);
845 sock_put(sk);
846
847 /* a return value > 0 means to resubmit the input, but
848 * it wants the return to be -protocol, or 0
849 */
850 if (ret > 0)
851 return -ret;
852
853 return 0;
854 }
855
856 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
857 goto discard;
858
859 if (udp_lib_checksum_complete(skb))
860 goto csum_error;
861
862 UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
863 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
864
865 kfree_skb(skb);
866 return 0;
867
868 short_packet:
869 LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n",
870 proto == IPPROTO_UDPLITE ? "-Lite" : "",
871 saddr,
872 ntohs(uh->source),
873 ulen,
874 skb->len,
875 daddr,
876 ntohs(uh->dest));
877 goto discard;
878 csum_error:
879 UDP6_INC_STATS_BH(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE);
880 discard:
881 UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
882 kfree_skb(skb);
883 return 0;
884 }
885
886 static __inline__ int udpv6_rcv(struct sk_buff *skb)
887 {
888 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP);
889 }
890
891 /*
892 * Throw away all pending data and cancel the corking. Socket is locked.
893 */
894 static void udp_v6_flush_pending_frames(struct sock *sk)
895 {
896 struct udp_sock *up = udp_sk(sk);
897
898 if (up->pending == AF_INET)
899 udp_flush_pending_frames(sk);
900 else if (up->pending) {
901 up->len = 0;
902 up->pending = 0;
903 ip6_flush_pending_frames(sk);
904 }
905 }
906
907 /**
908 * udp6_hwcsum_outgoing - handle outgoing HW checksumming
909 * @sk: socket we are sending on
910 * @skb: sk_buff containing the filled-in UDP header
911 * (checksum field must be zeroed out)
912 */
913 static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
914 const struct in6_addr *saddr,
915 const struct in6_addr *daddr, int len)
916 {
917 unsigned int offset;
918 struct udphdr *uh = udp_hdr(skb);
919 __wsum csum = 0;
920
921 if (skb_queue_len(&sk->sk_write_queue) == 1) {
922 /* Only one fragment on the socket. */
923 skb->csum_start = skb_transport_header(skb) - skb->head;
924 skb->csum_offset = offsetof(struct udphdr, check);
925 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0);
926 } else {
927 /*
928 * HW-checksum won't work as there are two or more
929 * fragments on the socket so that all csums of sk_buffs
930 * should be together
931 */
932 offset = skb_transport_offset(skb);
933 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
934
935 skb->ip_summed = CHECKSUM_NONE;
936
937 skb_queue_walk(&sk->sk_write_queue, skb) {
938 csum = csum_add(csum, skb->csum);
939 }
940
941 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP,
942 csum);
943 if (uh->check == 0)
944 uh->check = CSUM_MANGLED_0;
945 }
946 }
947
948 /*
949 * Sending
950 */
951
952 static int udp_v6_push_pending_frames(struct sock *sk)
953 {
954 struct sk_buff *skb;
955 struct udphdr *uh;
956 struct udp_sock *up = udp_sk(sk);
957 struct inet_sock *inet = inet_sk(sk);
958 struct flowi6 *fl6 = &inet->cork.fl.u.ip6;
959 int err = 0;
960 int is_udplite = IS_UDPLITE(sk);
961 __wsum csum = 0;
962
963 /* Grab the skbuff where UDP header space exists. */
964 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
965 goto out;
966
967 /*
968 * Create a UDP header
969 */
970 uh = udp_hdr(skb);
971 uh->source = fl6->fl6_sport;
972 uh->dest = fl6->fl6_dport;
973 uh->len = htons(up->len);
974 uh->check = 0;
975
976 if (is_udplite)
977 csum = udplite_csum_outgoing(sk, skb);
978 else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
979 udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr,
980 up->len);
981 goto send;
982 } else
983 csum = udp_csum_outgoing(sk, skb);
984
985 /* add protocol-dependent pseudo-header */
986 uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
987 up->len, fl6->flowi6_proto, csum);
988 if (uh->check == 0)
989 uh->check = CSUM_MANGLED_0;
990
991 send:
992 err = ip6_push_pending_frames(sk);
993 if (err) {
994 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) {
995 UDP6_INC_STATS_USER(sock_net(sk),
996 UDP_MIB_SNDBUFERRORS, is_udplite);
997 err = 0;
998 }
999 } else
1000 UDP6_INC_STATS_USER(sock_net(sk),
1001 UDP_MIB_OUTDATAGRAMS, is_udplite);
1002 out:
1003 up->len = 0;
1004 up->pending = 0;
1005 return err;
1006 }
1007
1008 int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
1009 struct msghdr *msg, size_t len)
1010 {
1011 struct ipv6_txoptions opt_space;
1012 struct udp_sock *up = udp_sk(sk);
1013 struct inet_sock *inet = inet_sk(sk);
1014 struct ipv6_pinfo *np = inet6_sk(sk);
1015 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
1016 struct in6_addr *daddr, *final_p, final;
1017 struct ipv6_txoptions *opt = NULL;
1018 struct ip6_flowlabel *flowlabel = NULL;
1019 struct flowi6 fl6;
1020 struct dst_entry *dst;
1021 int addr_len = msg->msg_namelen;
1022 int ulen = len;
1023 int hlimit = -1;
1024 int tclass = -1;
1025 int dontfrag = -1;
1026 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
1027 int err;
1028 int connected = 0;
1029 int is_udplite = IS_UDPLITE(sk);
1030 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
1031
1032 /* destination address check */
1033 if (sin6) {
1034 if (addr_len < offsetof(struct sockaddr, sa_data))
1035 return -EINVAL;
1036
1037 switch (sin6->sin6_family) {
1038 case AF_INET6:
1039 if (addr_len < SIN6_LEN_RFC2133)
1040 return -EINVAL;
1041 daddr = &sin6->sin6_addr;
1042 break;
1043 case AF_INET:
1044 goto do_udp_sendmsg;
1045 case AF_UNSPEC:
1046 msg->msg_name = sin6 = NULL;
1047 msg->msg_namelen = addr_len = 0;
1048 daddr = NULL;
1049 break;
1050 default:
1051 return -EINVAL;
1052 }
1053 } else if (!up->pending) {
1054 if (sk->sk_state != TCP_ESTABLISHED)
1055 return -EDESTADDRREQ;
1056 daddr = &np->daddr;
1057 } else
1058 daddr = NULL;
1059
1060 if (daddr) {
1061 if (ipv6_addr_v4mapped(daddr)) {
1062 struct sockaddr_in sin;
1063 sin.sin_family = AF_INET;
1064 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport;
1065 sin.sin_addr.s_addr = daddr->s6_addr32[3];
1066 msg->msg_name = &sin;
1067 msg->msg_namelen = sizeof(sin);
1068 do_udp_sendmsg:
1069 if (__ipv6_only_sock(sk))
1070 return -ENETUNREACH;
1071 return udp_sendmsg(iocb, sk, msg, len);
1072 }
1073 }
1074
1075 if (up->pending == AF_INET)
1076 return udp_sendmsg(iocb, sk, msg, len);
1077
1078 /* Rough check on arithmetic overflow,
1079 better check is made in ip6_append_data().
1080 */
1081 if (len > INT_MAX - sizeof(struct udphdr))
1082 return -EMSGSIZE;
1083
1084 if (up->pending) {
1085 /*
1086 * There are pending frames.
1087 * The socket lock must be held while it's corked.
1088 */
1089 lock_sock(sk);
1090 if (likely(up->pending)) {
1091 if (unlikely(up->pending != AF_INET6)) {
1092 release_sock(sk);
1093 return -EAFNOSUPPORT;
1094 }
1095 dst = NULL;
1096 goto do_append_data;
1097 }
1098 release_sock(sk);
1099 }
1100 ulen += sizeof(struct udphdr);
1101
1102 memset(&fl6, 0, sizeof(fl6));
1103
1104 if (sin6) {
1105 if (sin6->sin6_port == 0)
1106 return -EINVAL;
1107
1108 fl6.fl6_dport = sin6->sin6_port;
1109 daddr = &sin6->sin6_addr;
1110
1111 if (np->sndflow) {
1112 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
1113 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
1114 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1115 if (flowlabel == NULL)
1116 return -EINVAL;
1117 daddr = &flowlabel->dst;
1118 }
1119 }
1120
1121 /*
1122 * Otherwise it will be difficult to maintain
1123 * sk->sk_dst_cache.
1124 */
1125 if (sk->sk_state == TCP_ESTABLISHED &&
1126 ipv6_addr_equal(daddr, &np->daddr))
1127 daddr = &np->daddr;
1128
1129 if (addr_len >= sizeof(struct sockaddr_in6) &&
1130 sin6->sin6_scope_id &&
1131 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
1132 fl6.flowi6_oif = sin6->sin6_scope_id;
1133 } else {
1134 if (sk->sk_state != TCP_ESTABLISHED)
1135 return -EDESTADDRREQ;
1136
1137 fl6.fl6_dport = inet->inet_dport;
1138 daddr = &np->daddr;
1139 fl6.flowlabel = np->flow_label;
1140 connected = 1;
1141 }
1142
1143 if (!fl6.flowi6_oif)
1144 fl6.flowi6_oif = sk->sk_bound_dev_if;
1145
1146 if (!fl6.flowi6_oif)
1147 fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex;
1148
1149 fl6.flowi6_mark = sk->sk_mark;
1150
1151 if (msg->msg_controllen) {
1152 opt = &opt_space;
1153 memset(opt, 0, sizeof(struct ipv6_txoptions));
1154 opt->tot_len = sizeof(*opt);
1155
1156 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt,
1157 &hlimit, &tclass, &dontfrag);
1158 if (err < 0) {
1159 fl6_sock_release(flowlabel);
1160 return err;
1161 }
1162 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
1163 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1164 if (flowlabel == NULL)
1165 return -EINVAL;
1166 }
1167 if (!(opt->opt_nflen|opt->opt_flen))
1168 opt = NULL;
1169 connected = 0;
1170 }
1171 if (opt == NULL)
1172 opt = np->opt;
1173 if (flowlabel)
1174 opt = fl6_merge_options(&opt_space, flowlabel, opt);
1175 opt = ipv6_fixup_options(&opt_space, opt);
1176
1177 fl6.flowi6_proto = sk->sk_protocol;
1178 if (!ipv6_addr_any(daddr))
1179 fl6.daddr = *daddr;
1180 else
1181 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
1182 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
1183 fl6.saddr = np->saddr;
1184 fl6.fl6_sport = inet->inet_sport;
1185
1186 final_p = fl6_update_dst(&fl6, opt, &final);
1187 if (final_p)
1188 connected = 0;
1189
1190 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) {
1191 fl6.flowi6_oif = np->mcast_oif;
1192 connected = 0;
1193 } else if (!fl6.flowi6_oif)
1194 fl6.flowi6_oif = np->ucast_oif;
1195
1196 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
1197
1198 dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p, true);
1199 if (IS_ERR(dst)) {
1200 err = PTR_ERR(dst);
1201 dst = NULL;
1202 goto out;
1203 }
1204
1205 if (hlimit < 0) {
1206 if (ipv6_addr_is_multicast(&fl6.daddr))
1207 hlimit = np->mcast_hops;
1208 else
1209 hlimit = np->hop_limit;
1210 if (hlimit < 0)
1211 hlimit = ip6_dst_hoplimit(dst);
1212 }
1213
1214 if (tclass < 0)
1215 tclass = np->tclass;
1216
1217 if (dontfrag < 0)
1218 dontfrag = np->dontfrag;
1219
1220 if (msg->msg_flags&MSG_CONFIRM)
1221 goto do_confirm;
1222 back_from_confirm:
1223
1224 lock_sock(sk);
1225 if (unlikely(up->pending)) {
1226 /* The socket is already corked while preparing it. */
1227 /* ... which is an evident application bug. --ANK */
1228 release_sock(sk);
1229
1230 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
1231 err = -EINVAL;
1232 goto out;
1233 }
1234
1235 up->pending = AF_INET6;
1236
1237 do_append_data:
1238 up->len += ulen;
1239 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
1240 err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen,
1241 sizeof(struct udphdr), hlimit, tclass, opt, &fl6,
1242 (struct rt6_info*)dst,
1243 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, dontfrag);
1244 if (err)
1245 udp_v6_flush_pending_frames(sk);
1246 else if (!corkreq)
1247 err = udp_v6_push_pending_frames(sk);
1248 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
1249 up->pending = 0;
1250
1251 if (dst) {
1252 if (connected) {
1253 ip6_dst_store(sk, dst,
1254 ipv6_addr_equal(&fl6.daddr, &np->daddr) ?
1255 &np->daddr : NULL,
1256 #ifdef CONFIG_IPV6_SUBTREES
1257 ipv6_addr_equal(&fl6.saddr, &np->saddr) ?
1258 &np->saddr :
1259 #endif
1260 NULL);
1261 } else {
1262 dst_release(dst);
1263 }
1264 dst = NULL;
1265 }
1266
1267 if (err > 0)
1268 err = np->recverr ? net_xmit_errno(err) : 0;
1269 release_sock(sk);
1270 out:
1271 dst_release(dst);
1272 fl6_sock_release(flowlabel);
1273 if (!err)
1274 return len;
1275 /*
1276 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
1277 * ENOBUFS might not be good (it's not tunable per se), but otherwise
1278 * we don't have a good statistic (IpOutDiscards but it can be too many
1279 * things). We could add another new stat but at least for now that
1280 * seems like overkill.
1281 */
1282 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
1283 UDP6_INC_STATS_USER(sock_net(sk),
1284 UDP_MIB_SNDBUFERRORS, is_udplite);
1285 }
1286 return err;
1287
1288 do_confirm:
1289 dst_confirm(dst);
1290 if (!(msg->msg_flags&MSG_PROBE) || len)
1291 goto back_from_confirm;
1292 err = 0;
1293 goto out;
1294 }
1295
1296 void udpv6_destroy_sock(struct sock *sk)
1297 {
1298 struct udp_sock *up = udp_sk(sk);
1299 lock_sock(sk);
1300 udp_v6_flush_pending_frames(sk);
1301 release_sock(sk);
1302
1303 if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
1304 void (*encap_destroy)(struct sock *sk);
1305 encap_destroy = ACCESS_ONCE(up->encap_destroy);
1306 if (encap_destroy)
1307 encap_destroy(sk);
1308 }
1309
1310 inet6_destroy_sock(sk);
1311 }
1312
1313 /*
1314 * Socket option code for UDP
1315 */
1316 int udpv6_setsockopt(struct sock *sk, int level, int optname,
1317 char __user *optval, unsigned int optlen)
1318 {
1319 if (level == SOL_UDP || level == SOL_UDPLITE)
1320 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1321 udp_v6_push_pending_frames);
1322 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1323 }
1324
1325 #ifdef CONFIG_COMPAT
1326 int compat_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 compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
1333 }
1334 #endif
1335
1336 int udpv6_getsockopt(struct sock *sk, int level, int optname,
1337 char __user *optval, int __user *optlen)
1338 {
1339 if (level == SOL_UDP || level == SOL_UDPLITE)
1340 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1341 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1342 }
1343
1344 #ifdef CONFIG_COMPAT
1345 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
1346 char __user *optval, int __user *optlen)
1347 {
1348 if (level == SOL_UDP || level == SOL_UDPLITE)
1349 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1350 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
1351 }
1352 #endif
1353
1354 static const struct inet6_protocol udpv6_protocol = {
1355 .handler = udpv6_rcv,
1356 .err_handler = udpv6_err,
1357 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1358 };
1359
1360 /* ------------------------------------------------------------------------ */
1361 #ifdef CONFIG_PROC_FS
1362
1363 static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket)
1364 {
1365 struct inet_sock *inet = inet_sk(sp);
1366 struct ipv6_pinfo *np = inet6_sk(sp);
1367 const struct in6_addr *dest, *src;
1368 __u16 destp, srcp;
1369
1370 dest = &np->daddr;
1371 src = &np->rcv_saddr;
1372 destp = ntohs(inet->inet_dport);
1373 srcp = ntohs(inet->inet_sport);
1374 seq_printf(seq,
1375 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1376 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %d\n",
1377 bucket,
1378 src->s6_addr32[0], src->s6_addr32[1],
1379 src->s6_addr32[2], src->s6_addr32[3], srcp,
1380 dest->s6_addr32[0], dest->s6_addr32[1],
1381 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1382 sp->sk_state,
1383 sk_wmem_alloc_get(sp),
1384 sk_rmem_alloc_get(sp),
1385 0, 0L, 0,
1386 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)),
1387 0,
1388 sock_i_ino(sp),
1389 atomic_read(&sp->sk_refcnt), sp,
1390 atomic_read(&sp->sk_drops));
1391 }
1392
1393 int udp6_seq_show(struct seq_file *seq, void *v)
1394 {
1395 if (v == SEQ_START_TOKEN)
1396 seq_printf(seq,
1397 " sl "
1398 "local_address "
1399 "remote_address "
1400 "st tx_queue rx_queue tr tm->when retrnsmt"
1401 " uid timeout inode ref pointer drops\n");
1402 else
1403 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket);
1404 return 0;
1405 }
1406
1407 static const struct file_operations udp6_afinfo_seq_fops = {
1408 .owner = THIS_MODULE,
1409 .open = udp_seq_open,
1410 .read = seq_read,
1411 .llseek = seq_lseek,
1412 .release = seq_release_net
1413 };
1414
1415 static struct udp_seq_afinfo udp6_seq_afinfo = {
1416 .name = "udp6",
1417 .family = AF_INET6,
1418 .udp_table = &udp_table,
1419 .seq_fops = &udp6_afinfo_seq_fops,
1420 .seq_ops = {
1421 .show = udp6_seq_show,
1422 },
1423 };
1424
1425 int __net_init udp6_proc_init(struct net *net)
1426 {
1427 return udp_proc_register(net, &udp6_seq_afinfo);
1428 }
1429
1430 void udp6_proc_exit(struct net *net) {
1431 udp_proc_unregister(net, &udp6_seq_afinfo);
1432 }
1433 #endif /* CONFIG_PROC_FS */
1434
1435 void udp_v6_clear_sk(struct sock *sk, int size)
1436 {
1437 struct inet_sock *inet = inet_sk(sk);
1438
1439 /* we do not want to clear pinet6 field, because of RCU lookups */
1440 sk_prot_clear_portaddr_nulls(sk, offsetof(struct inet_sock, pinet6));
1441
1442 size -= offsetof(struct inet_sock, pinet6) + sizeof(inet->pinet6);
1443 memset(&inet->pinet6 + 1, 0, size);
1444 }
1445
1446 /* ------------------------------------------------------------------------ */
1447
1448 struct proto udpv6_prot = {
1449 .name = "UDPv6",
1450 .owner = THIS_MODULE,
1451 .close = udp_lib_close,
1452 .connect = ip6_datagram_connect,
1453 .disconnect = udp_disconnect,
1454 .ioctl = udp_ioctl,
1455 .destroy = udpv6_destroy_sock,
1456 .setsockopt = udpv6_setsockopt,
1457 .getsockopt = udpv6_getsockopt,
1458 .sendmsg = udpv6_sendmsg,
1459 .recvmsg = udpv6_recvmsg,
1460 .backlog_rcv = __udpv6_queue_rcv_skb,
1461 .hash = udp_lib_hash,
1462 .unhash = udp_lib_unhash,
1463 .rehash = udp_v6_rehash,
1464 .get_port = udp_v6_get_port,
1465 .memory_allocated = &udp_memory_allocated,
1466 .sysctl_mem = sysctl_udp_mem,
1467 .sysctl_wmem = &sysctl_udp_wmem_min,
1468 .sysctl_rmem = &sysctl_udp_rmem_min,
1469 .obj_size = sizeof(struct udp6_sock),
1470 .slab_flags = SLAB_DESTROY_BY_RCU,
1471 .h.udp_table = &udp_table,
1472 #ifdef CONFIG_COMPAT
1473 .compat_setsockopt = compat_udpv6_setsockopt,
1474 .compat_getsockopt = compat_udpv6_getsockopt,
1475 #endif
1476 .clear_sk = udp_v6_clear_sk,
1477 };
1478
1479 static struct inet_protosw udpv6_protosw = {
1480 .type = SOCK_DGRAM,
1481 .protocol = IPPROTO_UDP,
1482 .prot = &udpv6_prot,
1483 .ops = &inet6_dgram_ops,
1484 .no_check = UDP_CSUM_DEFAULT,
1485 .flags = INET_PROTOSW_PERMANENT,
1486 };
1487
1488
1489 int __init udpv6_init(void)
1490 {
1491 int ret;
1492
1493 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
1494 if (ret)
1495 goto out;
1496
1497 ret = inet6_register_protosw(&udpv6_protosw);
1498 if (ret)
1499 goto out_udpv6_protocol;
1500 out:
1501 return ret;
1502
1503 out_udpv6_protocol:
1504 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1505 goto out;
1506 }
1507
1508 void udpv6_exit(void)
1509 {
1510 inet6_unregister_protosw(&udpv6_protosw);
1511 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1512 }
kernel source for telekom puls (alcatel/mediatek)