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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#include <net/sock_reuseport.h>
51
52#include <linux/proc_fs.h>
53#include <linux/seq_file.h>
54#include <trace/events/skb.h>
55#include "udp_impl.h"
56
57static u32 udp6_ehashfn(const struct net *net,
58 const struct in6_addr *laddr,
59 const u16 lport,
60 const struct in6_addr *faddr,
61 const __be16 fport)
62{
63 static u32 udp6_ehash_secret __read_mostly;
64 static u32 udp_ipv6_hash_secret __read_mostly;
65
66 u32 lhash, fhash;
67
68 net_get_random_once(&udp6_ehash_secret,
69 sizeof(udp6_ehash_secret));
70 net_get_random_once(&udp_ipv6_hash_secret,
71 sizeof(udp_ipv6_hash_secret));
72
73 lhash = (__force u32)laddr->s6_addr32[3];
74 fhash = __ipv6_addr_jhash(faddr, udp_ipv6_hash_secret);
75
76 return __inet6_ehashfn(lhash, lport, fhash, fport,
77 udp_ipv6_hash_secret + net_hash_mix(net));
78}
79
80
81
82
83
84
85
86int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2,
87 bool match_wildcard)
88{
89 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
90 int sk2_ipv6only = inet_v6_ipv6only(sk2);
91 int addr_type = ipv6_addr_type(&sk->sk_v6_rcv_saddr);
92 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
93
94
95 if (addr_type == IPV6_ADDR_MAPPED && addr_type2 == IPV6_ADDR_MAPPED) {
96 if (!sk2_ipv6only) {
97 if (sk->sk_rcv_saddr == sk2->sk_rcv_saddr)
98 return 1;
99 if (!sk->sk_rcv_saddr || !sk2->sk_rcv_saddr)
100 return match_wildcard;
101 }
102 return 0;
103 }
104
105 if (addr_type == IPV6_ADDR_ANY && addr_type2 == IPV6_ADDR_ANY)
106 return 1;
107
108 if (addr_type2 == IPV6_ADDR_ANY && match_wildcard &&
109 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
110 return 1;
111
112 if (addr_type == IPV6_ADDR_ANY && match_wildcard &&
113 !(ipv6_only_sock(sk) && addr_type2 == IPV6_ADDR_MAPPED))
114 return 1;
115
116 if (sk2_rcv_saddr6 &&
117 ipv6_addr_equal(&sk->sk_v6_rcv_saddr, sk2_rcv_saddr6))
118 return 1;
119
120 return 0;
121}
122
123static u32 udp6_portaddr_hash(const struct net *net,
124 const struct in6_addr *addr6,
125 unsigned int port)
126{
127 unsigned int hash, mix = net_hash_mix(net);
128
129 if (ipv6_addr_any(addr6))
130 hash = jhash_1word(0, mix);
131 else if (ipv6_addr_v4mapped(addr6))
132 hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix);
133 else
134 hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix);
135
136 return hash ^ port;
137}
138
139int udp_v6_get_port(struct sock *sk, unsigned short snum)
140{
141 unsigned int hash2_nulladdr =
142 udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum);
143 unsigned int hash2_partial =
144 udp6_portaddr_hash(sock_net(sk), &sk->sk_v6_rcv_saddr, 0);
145
146
147 udp_sk(sk)->udp_portaddr_hash = hash2_partial;
148 return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal, hash2_nulladdr);
149}
150
151static void udp_v6_rehash(struct sock *sk)
152{
153 u16 new_hash = udp6_portaddr_hash(sock_net(sk),
154 &sk->sk_v6_rcv_saddr,
155 inet_sk(sk)->inet_num);
156
157 udp_lib_rehash(sk, new_hash);
158}
159
160static inline int compute_score(struct sock *sk, struct net *net,
161 unsigned short hnum,
162 const struct in6_addr *saddr, __be16 sport,
163 const struct in6_addr *daddr, __be16 dport,
164 int dif)
165{
166 int score;
167 struct inet_sock *inet;
168
169 if (!net_eq(sock_net(sk), net) ||
170 udp_sk(sk)->udp_port_hash != hnum ||
171 sk->sk_family != PF_INET6)
172 return -1;
173
174 score = 0;
175 inet = inet_sk(sk);
176
177 if (inet->inet_dport) {
178 if (inet->inet_dport != sport)
179 return -1;
180 score++;
181 }
182
183 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
184 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr))
185 return -1;
186 score++;
187 }
188
189 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
190 if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr))
191 return -1;
192 score++;
193 }
194
195 if (sk->sk_bound_dev_if) {
196 if (sk->sk_bound_dev_if != dif)
197 return -1;
198 score++;
199 }
200
201 if (sk->sk_incoming_cpu == raw_smp_processor_id())
202 score++;
203
204 return score;
205}
206
207static inline int compute_score2(struct sock *sk, struct net *net,
208 const struct in6_addr *saddr, __be16 sport,
209 const struct in6_addr *daddr,
210 unsigned short hnum, int dif)
211{
212 int score;
213 struct inet_sock *inet;
214
215 if (!net_eq(sock_net(sk), net) ||
216 udp_sk(sk)->udp_port_hash != hnum ||
217 sk->sk_family != PF_INET6)
218 return -1;
219
220 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr))
221 return -1;
222
223 score = 0;
224 inet = inet_sk(sk);
225
226 if (inet->inet_dport) {
227 if (inet->inet_dport != sport)
228 return -1;
229 score++;
230 }
231
232 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
233 if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr))
234 return -1;
235 score++;
236 }
237
238 if (sk->sk_bound_dev_if) {
239 if (sk->sk_bound_dev_if != dif)
240 return -1;
241 score++;
242 }
243
244 if (sk->sk_incoming_cpu == raw_smp_processor_id())
245 score++;
246
247 return score;
248}
249
250
251static struct sock *udp6_lib_lookup2(struct net *net,
252 const struct in6_addr *saddr, __be16 sport,
253 const struct in6_addr *daddr, unsigned int hnum, int dif,
254 struct udp_hslot *hslot2, unsigned int slot2,
255 struct sk_buff *skb)
256{
257 struct sock *sk, *result;
258 struct hlist_nulls_node *node;
259 int score, badness, matches = 0, reuseport = 0;
260 bool select_ok = true;
261 u32 hash = 0;
262
263begin:
264 result = NULL;
265 badness = -1;
266 udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) {
267 score = compute_score2(sk, net, saddr, sport,
268 daddr, hnum, dif);
269 if (score > badness) {
270 result = sk;
271 badness = score;
272 reuseport = sk->sk_reuseport;
273 if (reuseport) {
274 hash = udp6_ehashfn(net, daddr, hnum,
275 saddr, sport);
276 if (select_ok) {
277 struct sock *sk2;
278
279 sk2 = reuseport_select_sock(sk, hash, skb,
280 sizeof(struct udphdr));
281 if (sk2) {
282 result = sk2;
283 select_ok = false;
284 goto found;
285 }
286 }
287 matches = 1;
288 }
289 } else if (score == badness && reuseport) {
290 matches++;
291 if (reciprocal_scale(hash, matches) == 0)
292 result = sk;
293 hash = next_pseudo_random32(hash);
294 }
295 }
296
297
298
299
300
301 if (get_nulls_value(node) != slot2)
302 goto begin;
303
304 if (result) {
305found:
306 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
307 result = NULL;
308 else if (unlikely(compute_score2(result, net, saddr, sport,
309 daddr, hnum, dif) < badness)) {
310 sock_put(result);
311 goto begin;
312 }
313 }
314 return result;
315}
316
317struct sock *__udp6_lib_lookup(struct net *net,
318 const struct in6_addr *saddr, __be16 sport,
319 const struct in6_addr *daddr, __be16 dport,
320 int dif, struct udp_table *udptable,
321 struct sk_buff *skb)
322{
323 struct sock *sk, *result;
324 struct hlist_nulls_node *node;
325 unsigned short hnum = ntohs(dport);
326 unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask);
327 struct udp_hslot *hslot2, *hslot = &udptable->hash[slot];
328 int score, badness, matches = 0, reuseport = 0;
329 bool select_ok = true;
330 u32 hash = 0;
331
332 rcu_read_lock();
333 if (hslot->count > 10) {
334 hash2 = udp6_portaddr_hash(net, daddr, hnum);
335 slot2 = hash2 & udptable->mask;
336 hslot2 = &udptable->hash2[slot2];
337 if (hslot->count < hslot2->count)
338 goto begin;
339
340 result = udp6_lib_lookup2(net, saddr, sport,
341 daddr, hnum, dif,
342 hslot2, slot2, skb);
343 if (!result) {
344 hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum);
345 slot2 = hash2 & udptable->mask;
346 hslot2 = &udptable->hash2[slot2];
347 if (hslot->count < hslot2->count)
348 goto begin;
349
350 result = udp6_lib_lookup2(net, saddr, sport,
351 &in6addr_any, hnum, dif,
352 hslot2, slot2, skb);
353 }
354 rcu_read_unlock();
355 return result;
356 }
357begin:
358 result = NULL;
359 badness = -1;
360 sk_nulls_for_each_rcu(sk, node, &hslot->head) {
361 score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif);
362 if (score > badness) {
363 result = sk;
364 badness = score;
365 reuseport = sk->sk_reuseport;
366 if (reuseport) {
367 hash = udp6_ehashfn(net, daddr, hnum,
368 saddr, sport);
369 if (select_ok) {
370 struct sock *sk2;
371
372 sk2 = reuseport_select_sock(sk, hash, skb,
373 sizeof(struct udphdr));
374 if (sk2) {
375 result = sk2;
376 select_ok = false;
377 goto found;
378 }
379 }
380 matches = 1;
381 }
382 } else if (score == badness && reuseport) {
383 matches++;
384 if (reciprocal_scale(hash, matches) == 0)
385 result = sk;
386 hash = next_pseudo_random32(hash);
387 }
388 }
389
390
391
392
393
394 if (get_nulls_value(node) != slot)
395 goto begin;
396
397 if (result) {
398found:
399 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
400 result = NULL;
401 else if (unlikely(compute_score(result, net, hnum, saddr, sport,
402 daddr, dport, dif) < badness)) {
403 sock_put(result);
404 goto begin;
405 }
406 }
407 rcu_read_unlock();
408 return result;
409}
410EXPORT_SYMBOL_GPL(__udp6_lib_lookup);
411
412static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb,
413 __be16 sport, __be16 dport,
414 struct udp_table *udptable)
415{
416 struct sock *sk;
417 const struct ipv6hdr *iph = ipv6_hdr(skb);
418
419 sk = skb_steal_sock(skb);
420 if (unlikely(sk))
421 return sk;
422 return __udp6_lib_lookup(dev_net(skb_dst(skb)->dev), &iph->saddr, sport,
423 &iph->daddr, dport, inet6_iif(skb),
424 udptable, skb);
425}
426
427struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport,
428 const struct in6_addr *daddr, __be16 dport, int dif)
429{
430 return __udp6_lib_lookup(net, saddr, sport, daddr, dport, dif, &udp_table, NULL);
431}
432EXPORT_SYMBOL_GPL(udp6_lib_lookup);
433
434
435
436
437
438
439int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
440 int noblock, int flags, int *addr_len)
441{
442 struct ipv6_pinfo *np = inet6_sk(sk);
443 struct inet_sock *inet = inet_sk(sk);
444 struct sk_buff *skb;
445 unsigned int ulen, copied;
446 int peeked, off = 0;
447 int err;
448 int is_udplite = IS_UDPLITE(sk);
449 bool checksum_valid = false;
450 int is_udp4;
451 bool slow;
452
453 if (flags & MSG_ERRQUEUE)
454 return ipv6_recv_error(sk, msg, len, addr_len);
455
456 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
457 return ipv6_recv_rxpmtu(sk, msg, len, addr_len);
458
459try_again:
460 skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),
461 &peeked, &off, &err);
462 if (!skb)
463 goto out;
464
465 ulen = skb->len - sizeof(struct udphdr);
466 copied = len;
467 if (copied > ulen)
468 copied = ulen;
469 else if (copied < ulen)
470 msg->msg_flags |= MSG_TRUNC;
471
472 is_udp4 = (skb->protocol == htons(ETH_P_IP));
473
474
475
476
477
478
479
480 if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) {
481 checksum_valid = !udp_lib_checksum_complete(skb);
482 if (!checksum_valid)
483 goto csum_copy_err;
484 }
485
486 if (checksum_valid || skb_csum_unnecessary(skb))
487 err = skb_copy_datagram_msg(skb, sizeof(struct udphdr),
488 msg, copied);
489 else {
490 err = skb_copy_and_csum_datagram_msg(skb, sizeof(struct udphdr), msg);
491 if (err == -EINVAL)
492 goto csum_copy_err;
493 }
494 if (unlikely(err)) {
495 trace_kfree_skb(skb, udpv6_recvmsg);
496 if (!peeked) {
497 atomic_inc(&sk->sk_drops);
498 if (is_udp4)
499 UDP_INC_STATS_USER(sock_net(sk),
500 UDP_MIB_INERRORS,
501 is_udplite);
502 else
503 UDP6_INC_STATS_USER(sock_net(sk),
504 UDP_MIB_INERRORS,
505 is_udplite);
506 }
507 goto out_free;
508 }
509 if (!peeked) {
510 if (is_udp4)
511 UDP_INC_STATS_USER(sock_net(sk),
512 UDP_MIB_INDATAGRAMS, is_udplite);
513 else
514 UDP6_INC_STATS_USER(sock_net(sk),
515 UDP_MIB_INDATAGRAMS, is_udplite);
516 }
517
518 sock_recv_ts_and_drops(msg, sk, skb);
519
520
521 if (msg->msg_name) {
522 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
523 sin6->sin6_family = AF_INET6;
524 sin6->sin6_port = udp_hdr(skb)->source;
525 sin6->sin6_flowinfo = 0;
526
527 if (is_udp4) {
528 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
529 &sin6->sin6_addr);
530 sin6->sin6_scope_id = 0;
531 } else {
532 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
533 sin6->sin6_scope_id =
534 ipv6_iface_scope_id(&sin6->sin6_addr,
535 inet6_iif(skb));
536 }
537 *addr_len = sizeof(*sin6);
538 }
539
540 if (np->rxopt.all)
541 ip6_datagram_recv_common_ctl(sk, msg, skb);
542
543 if (is_udp4) {
544 if (inet->cmsg_flags)
545 ip_cmsg_recv(msg, skb);
546 } else {
547 if (np->rxopt.all)
548 ip6_datagram_recv_specific_ctl(sk, msg, skb);
549 }
550
551 err = copied;
552 if (flags & MSG_TRUNC)
553 err = ulen;
554
555out_free:
556 skb_free_datagram_locked(sk, skb);
557out:
558 return err;
559
560csum_copy_err:
561 slow = lock_sock_fast(sk);
562 if (!skb_kill_datagram(sk, skb, flags)) {
563 if (is_udp4) {
564 UDP_INC_STATS_USER(sock_net(sk),
565 UDP_MIB_CSUMERRORS, is_udplite);
566 UDP_INC_STATS_USER(sock_net(sk),
567 UDP_MIB_INERRORS, is_udplite);
568 } else {
569 UDP6_INC_STATS_USER(sock_net(sk),
570 UDP_MIB_CSUMERRORS, is_udplite);
571 UDP6_INC_STATS_USER(sock_net(sk),
572 UDP_MIB_INERRORS, is_udplite);
573 }
574 }
575 unlock_sock_fast(sk, slow);
576
577
578 cond_resched();
579 msg->msg_flags &= ~MSG_TRUNC;
580 goto try_again;
581}
582
583void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
584 u8 type, u8 code, int offset, __be32 info,
585 struct udp_table *udptable)
586{
587 struct ipv6_pinfo *np;
588 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
589 const struct in6_addr *saddr = &hdr->saddr;
590 const struct in6_addr *daddr = &hdr->daddr;
591 struct udphdr *uh = (struct udphdr *)(skb->data+offset);
592 struct sock *sk;
593 int err;
594 struct net *net = dev_net(skb->dev);
595
596 sk = __udp6_lib_lookup(net, daddr, uh->dest, saddr, uh->source,
597 inet6_iif(skb), udptable, skb);
598 if (!sk) {
599 ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev),
600 ICMP6_MIB_INERRORS);
601 return;
602 }
603
604 if (type == ICMPV6_PKT_TOOBIG) {
605 if (!ip6_sk_accept_pmtu(sk))
606 goto out;
607 ip6_sk_update_pmtu(skb, sk, info);
608 }
609 if (type == NDISC_REDIRECT) {
610 ip6_sk_redirect(skb, sk);
611 goto out;
612 }
613
614 np = inet6_sk(sk);
615
616 if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
617 goto out;
618
619 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
620 goto out;
621
622 if (np->recverr)
623 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
624
625 sk->sk_err = err;
626 sk->sk_error_report(sk);
627out:
628 sock_put(sk);
629}
630
631static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
632{
633 int rc;
634
635 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
636 sock_rps_save_rxhash(sk, skb);
637 sk_mark_napi_id(sk, skb);
638 sk_incoming_cpu_update(sk);
639 }
640
641 rc = sock_queue_rcv_skb(sk, skb);
642 if (rc < 0) {
643 int is_udplite = IS_UDPLITE(sk);
644
645
646 if (rc == -ENOMEM)
647 UDP6_INC_STATS_BH(sock_net(sk),
648 UDP_MIB_RCVBUFERRORS, is_udplite);
649 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
650 kfree_skb(skb);
651 return -1;
652 }
653 return 0;
654}
655
656static __inline__ void udpv6_err(struct sk_buff *skb,
657 struct inet6_skb_parm *opt, u8 type,
658 u8 code, int offset, __be32 info)
659{
660 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table);
661}
662
663static struct static_key udpv6_encap_needed __read_mostly;
664void udpv6_encap_enable(void)
665{
666 if (!static_key_enabled(&udpv6_encap_needed))
667 static_key_slow_inc(&udpv6_encap_needed);
668}
669EXPORT_SYMBOL(udpv6_encap_enable);
670
671int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
672{
673 struct udp_sock *up = udp_sk(sk);
674 int rc;
675 int is_udplite = IS_UDPLITE(sk);
676
677 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
678 goto drop;
679
680 if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
681 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
682
683
684
685
686
687
688
689
690
691
692
693
694
695 encap_rcv = ACCESS_ONCE(up->encap_rcv);
696 if (skb->len > sizeof(struct udphdr) && encap_rcv) {
697 int ret;
698
699
700 if (udp_lib_checksum_complete(skb))
701 goto csum_error;
702
703 ret = encap_rcv(sk, skb);
704 if (ret <= 0) {
705 UDP_INC_STATS_BH(sock_net(sk),
706 UDP_MIB_INDATAGRAMS,
707 is_udplite);
708 return -ret;
709 }
710 }
711
712
713 }
714
715
716
717
718 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
719
720 if (up->pcrlen == 0) {
721 net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n",
722 UDP_SKB_CB(skb)->cscov, skb->len);
723 goto drop;
724 }
725 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
726 net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n",
727 UDP_SKB_CB(skb)->cscov, up->pcrlen);
728 goto drop;
729 }
730 }
731
732 if (rcu_access_pointer(sk->sk_filter)) {
733 if (udp_lib_checksum_complete(skb))
734 goto csum_error;
735 }
736
737 if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
738 UDP6_INC_STATS_BH(sock_net(sk),
739 UDP_MIB_RCVBUFERRORS, is_udplite);
740 goto drop;
741 }
742
743 skb_dst_drop(skb);
744
745 bh_lock_sock(sk);
746 rc = 0;
747 if (!sock_owned_by_user(sk))
748 rc = __udpv6_queue_rcv_skb(sk, skb);
749 else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
750 bh_unlock_sock(sk);
751 goto drop;
752 }
753 bh_unlock_sock(sk);
754
755 return rc;
756
757csum_error:
758 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite);
759drop:
760 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
761 atomic_inc(&sk->sk_drops);
762 kfree_skb(skb);
763 return -1;
764}
765
766static bool __udp_v6_is_mcast_sock(struct net *net, struct sock *sk,
767 __be16 loc_port, const struct in6_addr *loc_addr,
768 __be16 rmt_port, const struct in6_addr *rmt_addr,
769 int dif, unsigned short hnum)
770{
771 struct inet_sock *inet = inet_sk(sk);
772
773 if (!net_eq(sock_net(sk), net))
774 return false;
775
776 if (udp_sk(sk)->udp_port_hash != hnum ||
777 sk->sk_family != PF_INET6 ||
778 (inet->inet_dport && inet->inet_dport != rmt_port) ||
779 (!ipv6_addr_any(&sk->sk_v6_daddr) &&
780 !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) ||
781 (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif) ||
782 (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) &&
783 !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr)))
784 return false;
785 if (!inet6_mc_check(sk, loc_addr, rmt_addr))
786 return false;
787 return true;
788}
789
790static void flush_stack(struct sock **stack, unsigned int count,
791 struct sk_buff *skb, unsigned int final)
792{
793 struct sk_buff *skb1 = NULL;
794 struct sock *sk;
795 unsigned int i;
796
797 for (i = 0; i < count; i++) {
798 sk = stack[i];
799 if (likely(!skb1))
800 skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC);
801 if (!skb1) {
802 atomic_inc(&sk->sk_drops);
803 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS,
804 IS_UDPLITE(sk));
805 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS,
806 IS_UDPLITE(sk));
807 }
808
809 if (skb1 && udpv6_queue_rcv_skb(sk, skb1) <= 0)
810 skb1 = NULL;
811 sock_put(sk);
812 }
813 if (unlikely(skb1))
814 kfree_skb(skb1);
815}
816
817static void udp6_csum_zero_error(struct sk_buff *skb)
818{
819
820
821
822 net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n",
823 &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source),
824 &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest));
825}
826
827
828
829
830
831static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
832 const struct in6_addr *saddr, const struct in6_addr *daddr,
833 struct udp_table *udptable, int proto)
834{
835 struct sock *sk, *stack[256 / sizeof(struct sock *)];
836 const struct udphdr *uh = udp_hdr(skb);
837 struct hlist_nulls_node *node;
838 unsigned short hnum = ntohs(uh->dest);
839 struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum);
840 int dif = inet6_iif(skb);
841 unsigned int count = 0, offset = offsetof(typeof(*sk), sk_nulls_node);
842 unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10);
843 bool inner_flushed = false;
844
845 if (use_hash2) {
846 hash2_any = udp6_portaddr_hash(net, &in6addr_any, hnum) &
847 udp_table.mask;
848 hash2 = udp6_portaddr_hash(net, daddr, hnum) & udp_table.mask;
849start_lookup:
850 hslot = &udp_table.hash2[hash2];
851 offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node);
852 }
853
854 spin_lock(&hslot->lock);
855 sk_nulls_for_each_entry_offset(sk, node, &hslot->head, offset) {
856 if (__udp_v6_is_mcast_sock(net, sk,
857 uh->dest, daddr,
858 uh->source, saddr,
859 dif, hnum) &&
860
861
862
863 (uh->check || udp_sk(sk)->no_check6_rx)) {
864 if (unlikely(count == ARRAY_SIZE(stack))) {
865 flush_stack(stack, count, skb, ~0);
866 inner_flushed = true;
867 count = 0;
868 }
869 stack[count++] = sk;
870 sock_hold(sk);
871 }
872 }
873
874 spin_unlock(&hslot->lock);
875
876
877 if (use_hash2 && hash2 != hash2_any) {
878 hash2 = hash2_any;
879 goto start_lookup;
880 }
881
882 if (count) {
883 flush_stack(stack, count, skb, count - 1);
884 } else {
885 if (!inner_flushed)
886 UDP_INC_STATS_BH(net, UDP_MIB_IGNOREDMULTI,
887 proto == IPPROTO_UDPLITE);
888 consume_skb(skb);
889 }
890 return 0;
891}
892
893int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
894 int proto)
895{
896 struct net *net = dev_net(skb->dev);
897 struct sock *sk;
898 struct udphdr *uh;
899 const struct in6_addr *saddr, *daddr;
900 u32 ulen = 0;
901
902 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
903 goto discard;
904
905 saddr = &ipv6_hdr(skb)->saddr;
906 daddr = &ipv6_hdr(skb)->daddr;
907 uh = udp_hdr(skb);
908
909 ulen = ntohs(uh->len);
910 if (ulen > skb->len)
911 goto short_packet;
912
913 if (proto == IPPROTO_UDP) {
914
915
916
917 if (ulen == 0)
918 ulen = skb->len;
919
920 if (ulen < sizeof(*uh))
921 goto short_packet;
922
923 if (ulen < skb->len) {
924 if (pskb_trim_rcsum(skb, ulen))
925 goto short_packet;
926 saddr = &ipv6_hdr(skb)->saddr;
927 daddr = &ipv6_hdr(skb)->daddr;
928 uh = udp_hdr(skb);
929 }
930 }
931
932 if (udp6_csum_init(skb, uh, proto))
933 goto csum_error;
934
935
936
937
938 if (ipv6_addr_is_multicast(daddr))
939 return __udp6_lib_mcast_deliver(net, skb,
940 saddr, daddr, udptable, proto);
941
942
943
944
945
946
947
948 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
949 if (sk) {
950 int ret;
951
952 if (!uh->check && !udp_sk(sk)->no_check6_rx) {
953 sock_put(sk);
954 udp6_csum_zero_error(skb);
955 goto csum_error;
956 }
957
958 if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk))
959 skb_checksum_try_convert(skb, IPPROTO_UDP, uh->check,
960 ip6_compute_pseudo);
961
962 ret = udpv6_queue_rcv_skb(sk, skb);
963 sock_put(sk);
964
965
966 if (ret > 0)
967 return ret;
968
969 return 0;
970 }
971
972 if (!uh->check) {
973 udp6_csum_zero_error(skb);
974 goto csum_error;
975 }
976
977 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
978 goto discard;
979
980 if (udp_lib_checksum_complete(skb))
981 goto csum_error;
982
983 UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
984 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
985
986 kfree_skb(skb);
987 return 0;
988
989short_packet:
990 net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n",
991 proto == IPPROTO_UDPLITE ? "-Lite" : "",
992 saddr, ntohs(uh->source),
993 ulen, skb->len,
994 daddr, ntohs(uh->dest));
995 goto discard;
996csum_error:
997 UDP6_INC_STATS_BH(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE);
998discard:
999 UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
1000 kfree_skb(skb);
1001 return 0;
1002}
1003
1004static __inline__ int udpv6_rcv(struct sk_buff *skb)
1005{
1006 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP);
1007}
1008
1009
1010
1011
1012static void udp_v6_flush_pending_frames(struct sock *sk)
1013{
1014 struct udp_sock *up = udp_sk(sk);
1015
1016 if (up->pending == AF_INET)
1017 udp_flush_pending_frames(sk);
1018 else if (up->pending) {
1019 up->len = 0;
1020 up->pending = 0;
1021 ip6_flush_pending_frames(sk);
1022 }
1023}
1024
1025
1026
1027
1028
1029
1030
1031static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
1032 const struct in6_addr *saddr,
1033 const struct in6_addr *daddr, int len)
1034{
1035 unsigned int offset;
1036 struct udphdr *uh = udp_hdr(skb);
1037 struct sk_buff *frags = skb_shinfo(skb)->frag_list;
1038 __wsum csum = 0;
1039
1040 if (!frags) {
1041
1042 skb->csum_start = skb_transport_header(skb) - skb->head;
1043 skb->csum_offset = offsetof(struct udphdr, check);
1044 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0);
1045 } else {
1046
1047
1048
1049
1050
1051 offset = skb_transport_offset(skb);
1052 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
1053
1054 skb->ip_summed = CHECKSUM_NONE;
1055
1056 do {
1057 csum = csum_add(csum, frags->csum);
1058 } while ((frags = frags->next));
1059
1060 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP,
1061 csum);
1062 if (uh->check == 0)
1063 uh->check = CSUM_MANGLED_0;
1064 }
1065}
1066
1067
1068
1069
1070
1071static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6)
1072{
1073 struct sock *sk = skb->sk;
1074 struct udphdr *uh;
1075 int err = 0;
1076 int is_udplite = IS_UDPLITE(sk);
1077 __wsum csum = 0;
1078 int offset = skb_transport_offset(skb);
1079 int len = skb->len - offset;
1080
1081
1082
1083
1084 uh = udp_hdr(skb);
1085 uh->source = fl6->fl6_sport;
1086 uh->dest = fl6->fl6_dport;
1087 uh->len = htons(len);
1088 uh->check = 0;
1089
1090 if (is_udplite)
1091 csum = udplite_csum(skb);
1092 else if (udp_sk(sk)->no_check6_tx) {
1093 skb->ip_summed = CHECKSUM_NONE;
1094 goto send;
1095 } else if (skb->ip_summed == CHECKSUM_PARTIAL) {
1096 udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, len);
1097 goto send;
1098 } else
1099 csum = udp_csum(skb);
1100
1101
1102 uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
1103 len, fl6->flowi6_proto, csum);
1104 if (uh->check == 0)
1105 uh->check = CSUM_MANGLED_0;
1106
1107send:
1108 err = ip6_send_skb(skb);
1109 if (err) {
1110 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) {
1111 UDP6_INC_STATS_USER(sock_net(sk),
1112 UDP_MIB_SNDBUFERRORS, is_udplite);
1113 err = 0;
1114 }
1115 } else
1116 UDP6_INC_STATS_USER(sock_net(sk),
1117 UDP_MIB_OUTDATAGRAMS, is_udplite);
1118 return err;
1119}
1120
1121static int udp_v6_push_pending_frames(struct sock *sk)
1122{
1123 struct sk_buff *skb;
1124 struct udp_sock *up = udp_sk(sk);
1125 struct flowi6 fl6;
1126 int err = 0;
1127
1128 if (up->pending == AF_INET)
1129 return udp_push_pending_frames(sk);
1130
1131
1132
1133
1134 fl6 = inet_sk(sk)->cork.fl.u.ip6;
1135
1136 skb = ip6_finish_skb(sk);
1137 if (!skb)
1138 goto out;
1139
1140 err = udp_v6_send_skb(skb, &fl6);
1141
1142out:
1143 up->len = 0;
1144 up->pending = 0;
1145 return err;
1146}
1147
1148int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
1149{
1150 struct ipv6_txoptions opt_space;
1151 struct udp_sock *up = udp_sk(sk);
1152 struct inet_sock *inet = inet_sk(sk);
1153 struct ipv6_pinfo *np = inet6_sk(sk);
1154 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
1155 struct in6_addr *daddr, *final_p, final;
1156 struct ipv6_txoptions *opt = NULL;
1157 struct ipv6_txoptions *opt_to_free = NULL;
1158 struct ip6_flowlabel *flowlabel = NULL;
1159 struct flowi6 fl6;
1160 struct dst_entry *dst;
1161 int addr_len = msg->msg_namelen;
1162 int ulen = len;
1163 int hlimit = -1;
1164 int tclass = -1;
1165 int dontfrag = -1;
1166 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
1167 int err;
1168 int connected = 0;
1169 int is_udplite = IS_UDPLITE(sk);
1170 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
1171
1172
1173 if (sin6) {
1174 if (addr_len < offsetof(struct sockaddr, sa_data))
1175 return -EINVAL;
1176
1177 switch (sin6->sin6_family) {
1178 case AF_INET6:
1179 if (addr_len < SIN6_LEN_RFC2133)
1180 return -EINVAL;
1181 daddr = &sin6->sin6_addr;
1182 break;
1183 case AF_INET:
1184 goto do_udp_sendmsg;
1185 case AF_UNSPEC:
1186 msg->msg_name = sin6 = NULL;
1187 msg->msg_namelen = addr_len = 0;
1188 daddr = NULL;
1189 break;
1190 default:
1191 return -EINVAL;
1192 }
1193 } else if (!up->pending) {
1194 if (sk->sk_state != TCP_ESTABLISHED)
1195 return -EDESTADDRREQ;
1196 daddr = &sk->sk_v6_daddr;
1197 } else
1198 daddr = NULL;
1199
1200 if (daddr) {
1201 if (ipv6_addr_v4mapped(daddr)) {
1202 struct sockaddr_in sin;
1203 sin.sin_family = AF_INET;
1204 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport;
1205 sin.sin_addr.s_addr = daddr->s6_addr32[3];
1206 msg->msg_name = &sin;
1207 msg->msg_namelen = sizeof(sin);
1208do_udp_sendmsg:
1209 if (__ipv6_only_sock(sk))
1210 return -ENETUNREACH;
1211 return udp_sendmsg(sk, msg, len);
1212 }
1213 }
1214
1215 if (up->pending == AF_INET)
1216 return udp_sendmsg(sk, msg, len);
1217
1218
1219
1220
1221 if (len > INT_MAX - sizeof(struct udphdr))
1222 return -EMSGSIZE;
1223
1224 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
1225 if (up->pending) {
1226
1227
1228
1229
1230 lock_sock(sk);
1231 if (likely(up->pending)) {
1232 if (unlikely(up->pending != AF_INET6)) {
1233 release_sock(sk);
1234 return -EAFNOSUPPORT;
1235 }
1236 dst = NULL;
1237 goto do_append_data;
1238 }
1239 release_sock(sk);
1240 }
1241 ulen += sizeof(struct udphdr);
1242
1243 memset(&fl6, 0, sizeof(fl6));
1244
1245 if (sin6) {
1246 if (sin6->sin6_port == 0)
1247 return -EINVAL;
1248
1249 fl6.fl6_dport = sin6->sin6_port;
1250 daddr = &sin6->sin6_addr;
1251
1252 if (np->sndflow) {
1253 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
1254 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
1255 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1256 if (!flowlabel)
1257 return -EINVAL;
1258 }
1259 }
1260
1261
1262
1263
1264
1265 if (sk->sk_state == TCP_ESTABLISHED &&
1266 ipv6_addr_equal(daddr, &sk->sk_v6_daddr))
1267 daddr = &sk->sk_v6_daddr;
1268
1269 if (addr_len >= sizeof(struct sockaddr_in6) &&
1270 sin6->sin6_scope_id &&
1271 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
1272 fl6.flowi6_oif = sin6->sin6_scope_id;
1273 } else {
1274 if (sk->sk_state != TCP_ESTABLISHED)
1275 return -EDESTADDRREQ;
1276
1277 fl6.fl6_dport = inet->inet_dport;
1278 daddr = &sk->sk_v6_daddr;
1279 fl6.flowlabel = np->flow_label;
1280 connected = 1;
1281 }
1282
1283 if (!fl6.flowi6_oif)
1284 fl6.flowi6_oif = sk->sk_bound_dev_if;
1285
1286 if (!fl6.flowi6_oif)
1287 fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex;
1288
1289 fl6.flowi6_mark = sk->sk_mark;
1290
1291 if (msg->msg_controllen) {
1292 opt = &opt_space;
1293 memset(opt, 0, sizeof(struct ipv6_txoptions));
1294 opt->tot_len = sizeof(*opt);
1295
1296 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt,
1297 &hlimit, &tclass, &dontfrag);
1298 if (err < 0) {
1299 fl6_sock_release(flowlabel);
1300 return err;
1301 }
1302 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
1303 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1304 if (!flowlabel)
1305 return -EINVAL;
1306 }
1307 if (!(opt->opt_nflen|opt->opt_flen))
1308 opt = NULL;
1309 connected = 0;
1310 }
1311 if (!opt) {
1312 opt = txopt_get(np);
1313 opt_to_free = opt;
1314 }
1315 if (flowlabel)
1316 opt = fl6_merge_options(&opt_space, flowlabel, opt);
1317 opt = ipv6_fixup_options(&opt_space, opt);
1318
1319 fl6.flowi6_proto = sk->sk_protocol;
1320 if (!ipv6_addr_any(daddr))
1321 fl6.daddr = *daddr;
1322 else
1323 fl6.daddr.s6_addr[15] = 0x1;
1324 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
1325 fl6.saddr = np->saddr;
1326 fl6.fl6_sport = inet->inet_sport;
1327
1328 final_p = fl6_update_dst(&fl6, opt, &final);
1329 if (final_p)
1330 connected = 0;
1331
1332 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) {
1333 fl6.flowi6_oif = np->mcast_oif;
1334 connected = 0;
1335 } else if (!fl6.flowi6_oif)
1336 fl6.flowi6_oif = np->ucast_oif;
1337
1338 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
1339
1340 dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p);
1341 if (IS_ERR(dst)) {
1342 err = PTR_ERR(dst);
1343 dst = NULL;
1344 goto out;
1345 }
1346
1347 if (hlimit < 0)
1348 hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
1349
1350 if (tclass < 0)
1351 tclass = np->tclass;
1352
1353 if (msg->msg_flags&MSG_CONFIRM)
1354 goto do_confirm;
1355back_from_confirm:
1356
1357
1358 if (!corkreq) {
1359 struct sk_buff *skb;
1360
1361 skb = ip6_make_skb(sk, getfrag, msg, ulen,
1362 sizeof(struct udphdr), hlimit, tclass, opt,
1363 &fl6, (struct rt6_info *)dst,
1364 msg->msg_flags, dontfrag);
1365 err = PTR_ERR(skb);
1366 if (!IS_ERR_OR_NULL(skb))
1367 err = udp_v6_send_skb(skb, &fl6);
1368 goto release_dst;
1369 }
1370
1371 lock_sock(sk);
1372 if (unlikely(up->pending)) {
1373
1374
1375 release_sock(sk);
1376
1377 net_dbg_ratelimited("udp cork app bug 2\n");
1378 err = -EINVAL;
1379 goto out;
1380 }
1381
1382 up->pending = AF_INET6;
1383
1384do_append_data:
1385 if (dontfrag < 0)
1386 dontfrag = np->dontfrag;
1387 up->len += ulen;
1388 err = ip6_append_data(sk, getfrag, msg, ulen,
1389 sizeof(struct udphdr), hlimit, tclass, opt, &fl6,
1390 (struct rt6_info *)dst,
1391 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, dontfrag);
1392 if (err)
1393 udp_v6_flush_pending_frames(sk);
1394 else if (!corkreq)
1395 err = udp_v6_push_pending_frames(sk);
1396 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
1397 up->pending = 0;
1398
1399 if (err > 0)
1400 err = np->recverr ? net_xmit_errno(err) : 0;
1401 release_sock(sk);
1402
1403release_dst:
1404 if (dst) {
1405 if (connected) {
1406 ip6_dst_store(sk, dst,
1407 ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ?
1408 &sk->sk_v6_daddr : NULL,
1409#ifdef CONFIG_IPV6_SUBTREES
1410 ipv6_addr_equal(&fl6.saddr, &np->saddr) ?
1411 &np->saddr :
1412#endif
1413 NULL);
1414 } else {
1415 dst_release(dst);
1416 }
1417 dst = NULL;
1418 }
1419
1420out:
1421 dst_release(dst);
1422 fl6_sock_release(flowlabel);
1423 txopt_put(opt_to_free);
1424 if (!err)
1425 return len;
1426
1427
1428
1429
1430
1431
1432
1433 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
1434 UDP6_INC_STATS_USER(sock_net(sk),
1435 UDP_MIB_SNDBUFERRORS, is_udplite);
1436 }
1437 return err;
1438
1439do_confirm:
1440 dst_confirm(dst);
1441 if (!(msg->msg_flags&MSG_PROBE) || len)
1442 goto back_from_confirm;
1443 err = 0;
1444 goto out;
1445}
1446
1447void udpv6_destroy_sock(struct sock *sk)
1448{
1449 struct udp_sock *up = udp_sk(sk);
1450 lock_sock(sk);
1451 udp_v6_flush_pending_frames(sk);
1452 release_sock(sk);
1453
1454 if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
1455 void (*encap_destroy)(struct sock *sk);
1456 encap_destroy = ACCESS_ONCE(up->encap_destroy);
1457 if (encap_destroy)
1458 encap_destroy(sk);
1459 }
1460
1461 inet6_destroy_sock(sk);
1462}
1463
1464
1465
1466
1467int udpv6_setsockopt(struct sock *sk, int level, int optname,
1468 char __user *optval, unsigned int optlen)
1469{
1470 if (level == SOL_UDP || level == SOL_UDPLITE)
1471 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1472 udp_v6_push_pending_frames);
1473 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1474}
1475
1476#ifdef CONFIG_COMPAT
1477int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
1478 char __user *optval, unsigned int optlen)
1479{
1480 if (level == SOL_UDP || level == SOL_UDPLITE)
1481 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1482 udp_v6_push_pending_frames);
1483 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
1484}
1485#endif
1486
1487int udpv6_getsockopt(struct sock *sk, int level, int optname,
1488 char __user *optval, int __user *optlen)
1489{
1490 if (level == SOL_UDP || level == SOL_UDPLITE)
1491 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1492 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1493}
1494
1495#ifdef CONFIG_COMPAT
1496int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
1497 char __user *optval, int __user *optlen)
1498{
1499 if (level == SOL_UDP || level == SOL_UDPLITE)
1500 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1501 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
1502}
1503#endif
1504
1505static const struct inet6_protocol udpv6_protocol = {
1506 .handler = udpv6_rcv,
1507 .err_handler = udpv6_err,
1508 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1509};
1510
1511
1512#ifdef CONFIG_PROC_FS
1513int udp6_seq_show(struct seq_file *seq, void *v)
1514{
1515 if (v == SEQ_START_TOKEN) {
1516 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
1517 } else {
1518 int bucket = ((struct udp_iter_state *)seq->private)->bucket;
1519 struct inet_sock *inet = inet_sk(v);
1520 __u16 srcp = ntohs(inet->inet_sport);
1521 __u16 destp = ntohs(inet->inet_dport);
1522 ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket);
1523 }
1524 return 0;
1525}
1526
1527static const struct file_operations udp6_afinfo_seq_fops = {
1528 .owner = THIS_MODULE,
1529 .open = udp_seq_open,
1530 .read = seq_read,
1531 .llseek = seq_lseek,
1532 .release = seq_release_net
1533};
1534
1535static struct udp_seq_afinfo udp6_seq_afinfo = {
1536 .name = "udp6",
1537 .family = AF_INET6,
1538 .udp_table = &udp_table,
1539 .seq_fops = &udp6_afinfo_seq_fops,
1540 .seq_ops = {
1541 .show = udp6_seq_show,
1542 },
1543};
1544
1545int __net_init udp6_proc_init(struct net *net)
1546{
1547 return udp_proc_register(net, &udp6_seq_afinfo);
1548}
1549
1550void udp6_proc_exit(struct net *net)
1551{
1552 udp_proc_unregister(net, &udp6_seq_afinfo);
1553}
1554#endif
1555
1556void udp_v6_clear_sk(struct sock *sk, int size)
1557{
1558 struct inet_sock *inet = inet_sk(sk);
1559
1560
1561 sk_prot_clear_portaddr_nulls(sk, offsetof(struct inet_sock, pinet6));
1562
1563 size -= offsetof(struct inet_sock, pinet6) + sizeof(inet->pinet6);
1564 memset(&inet->pinet6 + 1, 0, size);
1565}
1566
1567
1568
1569struct proto udpv6_prot = {
1570 .name = "UDPv6",
1571 .owner = THIS_MODULE,
1572 .close = udp_lib_close,
1573 .connect = ip6_datagram_connect,
1574 .disconnect = udp_disconnect,
1575 .ioctl = udp_ioctl,
1576 .destroy = udpv6_destroy_sock,
1577 .setsockopt = udpv6_setsockopt,
1578 .getsockopt = udpv6_getsockopt,
1579 .sendmsg = udpv6_sendmsg,
1580 .recvmsg = udpv6_recvmsg,
1581 .backlog_rcv = __udpv6_queue_rcv_skb,
1582 .hash = udp_lib_hash,
1583 .unhash = udp_lib_unhash,
1584 .rehash = udp_v6_rehash,
1585 .get_port = udp_v6_get_port,
1586 .memory_allocated = &udp_memory_allocated,
1587 .sysctl_mem = sysctl_udp_mem,
1588 .sysctl_wmem = &sysctl_udp_wmem_min,
1589 .sysctl_rmem = &sysctl_udp_rmem_min,
1590 .obj_size = sizeof(struct udp6_sock),
1591 .slab_flags = SLAB_DESTROY_BY_RCU,
1592 .h.udp_table = &udp_table,
1593#ifdef CONFIG_COMPAT
1594 .compat_setsockopt = compat_udpv6_setsockopt,
1595 .compat_getsockopt = compat_udpv6_getsockopt,
1596#endif
1597 .clear_sk = udp_v6_clear_sk,
1598};
1599
1600static struct inet_protosw udpv6_protosw = {
1601 .type = SOCK_DGRAM,
1602 .protocol = IPPROTO_UDP,
1603 .prot = &udpv6_prot,
1604 .ops = &inet6_dgram_ops,
1605 .flags = INET_PROTOSW_PERMANENT,
1606};
1607
1608int __init udpv6_init(void)
1609{
1610 int ret;
1611
1612 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
1613 if (ret)
1614 goto out;
1615
1616 ret = inet6_register_protosw(&udpv6_protosw);
1617 if (ret)
1618 goto out_udpv6_protocol;
1619out:
1620 return ret;
1621
1622out_udpv6_protocol:
1623 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1624 goto out;
1625}
1626
1627void udpv6_exit(void)
1628{
1629 inet6_unregister_protosw(&udpv6_protosw);
1630 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1631}
1632
