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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 <linux/uaccess.h>
39
40#include <net/addrconf.h>
41#include <net/ndisc.h>
42#include <net/protocol.h>
43#include <net/transp_v6.h>
44#include <net/ip6_route.h>
45#include <net/raw.h>
46#include <net/tcp_states.h>
47#include <net/ip6_checksum.h>
48#include <net/xfrm.h>
49#include <net/inet_hashtables.h>
50#include <net/inet6_hashtables.h>
51#include <net/busy_poll.h>
52#include <net/sock_reuseport.h>
53
54#include <linux/proc_fs.h>
55#include <linux/seq_file.h>
56#include <trace/events/skb.h>
57#include "udp_impl.h"
58
59static bool udp6_lib_exact_dif_match(struct net *net, struct sk_buff *skb)
60{
61#if defined(CONFIG_NET_L3_MASTER_DEV)
62 if (!net->ipv4.sysctl_udp_l3mdev_accept &&
63 skb && ipv6_l3mdev_skb(IP6CB(skb)->flags))
64 return true;
65#endif
66 return false;
67}
68
69static u32 udp6_ehashfn(const struct net *net,
70 const struct in6_addr *laddr,
71 const u16 lport,
72 const struct in6_addr *faddr,
73 const __be16 fport)
74{
75 static u32 udp6_ehash_secret __read_mostly;
76 static u32 udp_ipv6_hash_secret __read_mostly;
77
78 u32 lhash, fhash;
79
80 net_get_random_once(&udp6_ehash_secret,
81 sizeof(udp6_ehash_secret));
82 net_get_random_once(&udp_ipv6_hash_secret,
83 sizeof(udp_ipv6_hash_secret));
84
85 lhash = (__force u32)laddr->s6_addr32[3];
86 fhash = __ipv6_addr_jhash(faddr, udp_ipv6_hash_secret);
87
88 return __inet6_ehashfn(lhash, lport, fhash, fport,
89 udp_ipv6_hash_secret + net_hash_mix(net));
90}
91
92int udp_v6_get_port(struct sock *sk, unsigned short snum)
93{
94 unsigned int hash2_nulladdr =
95 ipv6_portaddr_hash(sock_net(sk), &in6addr_any, snum);
96 unsigned int hash2_partial =
97 ipv6_portaddr_hash(sock_net(sk), &sk->sk_v6_rcv_saddr, 0);
98
99
100 udp_sk(sk)->udp_portaddr_hash = hash2_partial;
101 return udp_lib_get_port(sk, snum, hash2_nulladdr);
102}
103
104static void udp_v6_rehash(struct sock *sk)
105{
106 u16 new_hash = ipv6_portaddr_hash(sock_net(sk),
107 &sk->sk_v6_rcv_saddr,
108 inet_sk(sk)->inet_num);
109
110 udp_lib_rehash(sk, new_hash);
111}
112
113static int compute_score(struct sock *sk, struct net *net,
114 const struct in6_addr *saddr, __be16 sport,
115 const struct in6_addr *daddr, unsigned short hnum,
116 int dif, int sdif, bool exact_dif)
117{
118 int score;
119 struct inet_sock *inet;
120
121 if (!net_eq(sock_net(sk), net) ||
122 udp_sk(sk)->udp_port_hash != hnum ||
123 sk->sk_family != PF_INET6)
124 return -1;
125
126 score = 0;
127 inet = inet_sk(sk);
128
129 if (inet->inet_dport) {
130 if (inet->inet_dport != sport)
131 return -1;
132 score++;
133 }
134
135 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
136 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr))
137 return -1;
138 score++;
139 }
140
141 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
142 if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr))
143 return -1;
144 score++;
145 }
146
147 if (sk->sk_bound_dev_if || exact_dif) {
148 bool dev_match = (sk->sk_bound_dev_if == dif ||
149 sk->sk_bound_dev_if == sdif);
150
151 if (!dev_match)
152 return -1;
153 if (sk->sk_bound_dev_if)
154 score++;
155 }
156
157 if (sk->sk_incoming_cpu == raw_smp_processor_id())
158 score++;
159
160 return score;
161}
162
163
164static struct sock *udp6_lib_lookup2(struct net *net,
165 const struct in6_addr *saddr, __be16 sport,
166 const struct in6_addr *daddr, unsigned int hnum,
167 int dif, int sdif, bool exact_dif,
168 struct udp_hslot *hslot2, struct sk_buff *skb)
169{
170 struct sock *sk, *result;
171 int score, badness;
172 u32 hash = 0;
173
174 result = NULL;
175 badness = -1;
176 udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) {
177 score = compute_score(sk, net, saddr, sport,
178 daddr, hnum, dif, sdif, exact_dif);
179 if (score > badness) {
180 if (sk->sk_reuseport) {
181 hash = udp6_ehashfn(net, daddr, hnum,
182 saddr, sport);
183
184 result = reuseport_select_sock(sk, hash, skb,
185 sizeof(struct udphdr));
186 if (result)
187 return result;
188 }
189 result = sk;
190 badness = score;
191 }
192 }
193 return result;
194}
195
196
197struct sock *__udp6_lib_lookup(struct net *net,
198 const struct in6_addr *saddr, __be16 sport,
199 const struct in6_addr *daddr, __be16 dport,
200 int dif, int sdif, struct udp_table *udptable,
201 struct sk_buff *skb)
202{
203 struct sock *sk, *result;
204 unsigned short hnum = ntohs(dport);
205 unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask);
206 struct udp_hslot *hslot2, *hslot = &udptable->hash[slot];
207 bool exact_dif = udp6_lib_exact_dif_match(net, skb);
208 int score, badness;
209 u32 hash = 0;
210
211 if (hslot->count > 10) {
212 hash2 = ipv6_portaddr_hash(net, daddr, hnum);
213 slot2 = hash2 & udptable->mask;
214 hslot2 = &udptable->hash2[slot2];
215 if (hslot->count < hslot2->count)
216 goto begin;
217
218 result = udp6_lib_lookup2(net, saddr, sport,
219 daddr, hnum, dif, sdif, exact_dif,
220 hslot2, skb);
221 if (!result) {
222 unsigned int old_slot2 = slot2;
223 hash2 = ipv6_portaddr_hash(net, &in6addr_any, hnum);
224 slot2 = hash2 & udptable->mask;
225
226 if (unlikely(slot2 == old_slot2))
227 return result;
228
229 hslot2 = &udptable->hash2[slot2];
230 if (hslot->count < hslot2->count)
231 goto begin;
232
233 result = udp6_lib_lookup2(net, saddr, sport,
234 daddr, hnum, dif, sdif,
235 exact_dif, hslot2,
236 skb);
237 }
238 if (unlikely(IS_ERR(result)))
239 return NULL;
240 return result;
241 }
242begin:
243 result = NULL;
244 badness = -1;
245 sk_for_each_rcu(sk, &hslot->head) {
246 score = compute_score(sk, net, saddr, sport, daddr, hnum, dif,
247 sdif, exact_dif);
248 if (score > badness) {
249 if (sk->sk_reuseport) {
250 hash = udp6_ehashfn(net, daddr, hnum,
251 saddr, sport);
252 result = reuseport_select_sock(sk, hash, skb,
253 sizeof(struct udphdr));
254 if (unlikely(IS_ERR(result)))
255 return NULL;
256 if (result)
257 return result;
258 }
259 result = sk;
260 badness = score;
261 }
262 }
263 return result;
264}
265EXPORT_SYMBOL_GPL(__udp6_lib_lookup);
266
267static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb,
268 __be16 sport, __be16 dport,
269 struct udp_table *udptable)
270{
271 const struct ipv6hdr *iph = ipv6_hdr(skb);
272
273 return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport,
274 &iph->daddr, dport, inet6_iif(skb),
275 inet6_sdif(skb), udptable, skb);
276}
277
278struct sock *udp6_lib_lookup_skb(struct sk_buff *skb,
279 __be16 sport, __be16 dport)
280{
281 const struct ipv6hdr *iph = ipv6_hdr(skb);
282
283 return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport,
284 &iph->daddr, dport, inet6_iif(skb),
285 inet6_sdif(skb), &udp_table, skb);
286}
287EXPORT_SYMBOL_GPL(udp6_lib_lookup_skb);
288
289
290
291
292#if IS_ENABLED(CONFIG_NF_TPROXY_IPV6) || IS_ENABLED(CONFIG_NF_SOCKET_IPV6)
293struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport,
294 const struct in6_addr *daddr, __be16 dport, int dif)
295{
296 struct sock *sk;
297
298 sk = __udp6_lib_lookup(net, saddr, sport, daddr, dport,
299 dif, 0, &udp_table, NULL);
300 if (sk && !refcount_inc_not_zero(&sk->sk_refcnt))
301 sk = NULL;
302 return sk;
303}
304EXPORT_SYMBOL_GPL(udp6_lib_lookup);
305#endif
306
307
308
309
310
311static int udp6_skb_len(struct sk_buff *skb)
312{
313 return unlikely(inet6_is_jumbogram(skb)) ? skb->len : udp_skb_len(skb);
314}
315
316
317
318
319
320
321int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
322 int noblock, int flags, int *addr_len)
323{
324 struct ipv6_pinfo *np = inet6_sk(sk);
325 struct inet_sock *inet = inet_sk(sk);
326 struct sk_buff *skb;
327 unsigned int ulen, copied;
328 int peeked, peeking, off;
329 int err;
330 int is_udplite = IS_UDPLITE(sk);
331 bool checksum_valid = false;
332 int is_udp4;
333
334 if (flags & MSG_ERRQUEUE)
335 return ipv6_recv_error(sk, msg, len, addr_len);
336
337 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
338 return ipv6_recv_rxpmtu(sk, msg, len, addr_len);
339
340try_again:
341 peeking = flags & MSG_PEEK;
342 off = sk_peek_offset(sk, flags);
343 skb = __skb_recv_udp(sk, flags, noblock, &peeked, &off, &err);
344 if (!skb)
345 return err;
346
347 ulen = udp6_skb_len(skb);
348 copied = len;
349 if (copied > ulen - off)
350 copied = ulen - off;
351 else if (copied < ulen)
352 msg->msg_flags |= MSG_TRUNC;
353
354 is_udp4 = (skb->protocol == htons(ETH_P_IP));
355
356
357
358
359
360
361
362 if (copied < ulen || peeking ||
363 (is_udplite && UDP_SKB_CB(skb)->partial_cov)) {
364 checksum_valid = udp_skb_csum_unnecessary(skb) ||
365 !__udp_lib_checksum_complete(skb);
366 if (!checksum_valid)
367 goto csum_copy_err;
368 }
369
370 if (checksum_valid || udp_skb_csum_unnecessary(skb)) {
371 if (udp_skb_is_linear(skb))
372 err = copy_linear_skb(skb, copied, off, &msg->msg_iter);
373 else
374 err = skb_copy_datagram_msg(skb, off, msg, copied);
375 } else {
376 err = skb_copy_and_csum_datagram_msg(skb, off, msg);
377 if (err == -EINVAL)
378 goto csum_copy_err;
379 }
380 if (unlikely(err)) {
381 if (!peeked) {
382 atomic_inc(&sk->sk_drops);
383 if (is_udp4)
384 UDP_INC_STATS(sock_net(sk), UDP_MIB_INERRORS,
385 is_udplite);
386 else
387 UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS,
388 is_udplite);
389 }
390 kfree_skb(skb);
391 return err;
392 }
393 if (!peeked) {
394 if (is_udp4)
395 UDP_INC_STATS(sock_net(sk), UDP_MIB_INDATAGRAMS,
396 is_udplite);
397 else
398 UDP6_INC_STATS(sock_net(sk), UDP_MIB_INDATAGRAMS,
399 is_udplite);
400 }
401
402 sock_recv_ts_and_drops(msg, sk, skb);
403
404
405 if (msg->msg_name) {
406 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
407 sin6->sin6_family = AF_INET6;
408 sin6->sin6_port = udp_hdr(skb)->source;
409 sin6->sin6_flowinfo = 0;
410
411 if (is_udp4) {
412 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
413 &sin6->sin6_addr);
414 sin6->sin6_scope_id = 0;
415 } else {
416 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
417 sin6->sin6_scope_id =
418 ipv6_iface_scope_id(&sin6->sin6_addr,
419 inet6_iif(skb));
420 }
421 *addr_len = sizeof(*sin6);
422 }
423
424 if (np->rxopt.all)
425 ip6_datagram_recv_common_ctl(sk, msg, skb);
426
427 if (is_udp4) {
428 if (inet->cmsg_flags)
429 ip_cmsg_recv_offset(msg, sk, skb,
430 sizeof(struct udphdr), off);
431 } else {
432 if (np->rxopt.all)
433 ip6_datagram_recv_specific_ctl(sk, msg, skb);
434 }
435
436 err = copied;
437 if (flags & MSG_TRUNC)
438 err = ulen;
439
440 skb_consume_udp(sk, skb, peeking ? -err : err);
441 return err;
442
443csum_copy_err:
444 if (!__sk_queue_drop_skb(sk, &udp_sk(sk)->reader_queue, skb, flags,
445 udp_skb_destructor)) {
446 if (is_udp4) {
447 UDP_INC_STATS(sock_net(sk),
448 UDP_MIB_CSUMERRORS, is_udplite);
449 UDP_INC_STATS(sock_net(sk),
450 UDP_MIB_INERRORS, is_udplite);
451 } else {
452 UDP6_INC_STATS(sock_net(sk),
453 UDP_MIB_CSUMERRORS, is_udplite);
454 UDP6_INC_STATS(sock_net(sk),
455 UDP_MIB_INERRORS, is_udplite);
456 }
457 }
458 kfree_skb(skb);
459
460
461 cond_resched();
462 msg->msg_flags &= ~MSG_TRUNC;
463 goto try_again;
464}
465
466void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
467 u8 type, u8 code, int offset, __be32 info,
468 struct udp_table *udptable)
469{
470 struct ipv6_pinfo *np;
471 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
472 const struct in6_addr *saddr = &hdr->saddr;
473 const struct in6_addr *daddr = &hdr->daddr;
474 struct udphdr *uh = (struct udphdr *)(skb->data+offset);
475 struct sock *sk;
476 int harderr;
477 int err;
478 struct net *net = dev_net(skb->dev);
479
480 sk = __udp6_lib_lookup(net, daddr, uh->dest, saddr, uh->source,
481 inet6_iif(skb), 0, udptable, skb);
482 if (!sk) {
483 __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev),
484 ICMP6_MIB_INERRORS);
485 return;
486 }
487
488 harderr = icmpv6_err_convert(type, code, &err);
489 np = inet6_sk(sk);
490
491 if (type == ICMPV6_PKT_TOOBIG) {
492 if (!ip6_sk_accept_pmtu(sk))
493 goto out;
494 ip6_sk_update_pmtu(skb, sk, info);
495 if (np->pmtudisc != IPV6_PMTUDISC_DONT)
496 harderr = 1;
497 }
498 if (type == NDISC_REDIRECT) {
499 ip6_sk_redirect(skb, sk);
500 goto out;
501 }
502
503 if (!np->recverr) {
504 if (!harderr || sk->sk_state != TCP_ESTABLISHED)
505 goto out;
506 } else {
507 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
508 }
509
510 sk->sk_err = err;
511 sk->sk_error_report(sk);
512out:
513 return;
514}
515
516static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
517{
518 int rc;
519
520 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
521 sock_rps_save_rxhash(sk, skb);
522 sk_mark_napi_id(sk, skb);
523 sk_incoming_cpu_update(sk);
524 } else {
525 sk_mark_napi_id_once(sk, skb);
526 }
527
528 rc = __udp_enqueue_schedule_skb(sk, skb);
529 if (rc < 0) {
530 int is_udplite = IS_UDPLITE(sk);
531
532
533 if (rc == -ENOMEM)
534 UDP6_INC_STATS(sock_net(sk),
535 UDP_MIB_RCVBUFERRORS, is_udplite);
536 UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
537 kfree_skb(skb);
538 return -1;
539 }
540
541 return 0;
542}
543
544static __inline__ void udpv6_err(struct sk_buff *skb,
545 struct inet6_skb_parm *opt, u8 type,
546 u8 code, int offset, __be32 info)
547{
548 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table);
549}
550
551static DEFINE_STATIC_KEY_FALSE(udpv6_encap_needed_key);
552void udpv6_encap_enable(void)
553{
554 static_branch_enable(&udpv6_encap_needed_key);
555}
556EXPORT_SYMBOL(udpv6_encap_enable);
557
558static int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
559{
560 struct udp_sock *up = udp_sk(sk);
561 int is_udplite = IS_UDPLITE(sk);
562
563 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
564 goto drop;
565
566 if (static_branch_unlikely(&udpv6_encap_needed_key) && up->encap_type) {
567 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
568
569
570
571
572
573
574
575
576
577
578
579
580
581 encap_rcv = READ_ONCE(up->encap_rcv);
582 if (encap_rcv) {
583 int ret;
584
585
586 if (udp_lib_checksum_complete(skb))
587 goto csum_error;
588
589 ret = encap_rcv(sk, skb);
590 if (ret <= 0) {
591 __UDP_INC_STATS(sock_net(sk),
592 UDP_MIB_INDATAGRAMS,
593 is_udplite);
594 return -ret;
595 }
596 }
597
598
599 }
600
601
602
603
604 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
605
606 if (up->pcrlen == 0) {
607 net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n",
608 UDP_SKB_CB(skb)->cscov, skb->len);
609 goto drop;
610 }
611 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
612 net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n",
613 UDP_SKB_CB(skb)->cscov, up->pcrlen);
614 goto drop;
615 }
616 }
617
618 prefetch(&sk->sk_rmem_alloc);
619 if (rcu_access_pointer(sk->sk_filter) &&
620 udp_lib_checksum_complete(skb))
621 goto csum_error;
622
623 if (sk_filter_trim_cap(sk, skb, sizeof(struct udphdr)))
624 goto drop;
625
626 udp_csum_pull_header(skb);
627
628 skb_dst_drop(skb);
629
630 return __udpv6_queue_rcv_skb(sk, skb);
631
632csum_error:
633 __UDP6_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite);
634drop:
635 __UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
636 atomic_inc(&sk->sk_drops);
637 kfree_skb(skb);
638 return -1;
639}
640
641static bool __udp_v6_is_mcast_sock(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, unsigned short hnum)
645{
646 struct inet_sock *inet = inet_sk(sk);
647
648 if (!net_eq(sock_net(sk), net))
649 return false;
650
651 if (udp_sk(sk)->udp_port_hash != hnum ||
652 sk->sk_family != PF_INET6 ||
653 (inet->inet_dport && inet->inet_dport != rmt_port) ||
654 (!ipv6_addr_any(&sk->sk_v6_daddr) &&
655 !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) ||
656 (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif) ||
657 (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) &&
658 !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr)))
659 return false;
660 if (!inet6_mc_check(sk, loc_addr, rmt_addr))
661 return false;
662 return true;
663}
664
665static void udp6_csum_zero_error(struct sk_buff *skb)
666{
667
668
669
670 net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n",
671 &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source),
672 &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest));
673}
674
675
676
677
678
679static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
680 const struct in6_addr *saddr, const struct in6_addr *daddr,
681 struct udp_table *udptable, int proto)
682{
683 struct sock *sk, *first = NULL;
684 const struct udphdr *uh = udp_hdr(skb);
685 unsigned short hnum = ntohs(uh->dest);
686 struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum);
687 unsigned int offset = offsetof(typeof(*sk), sk_node);
688 unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10);
689 int dif = inet6_iif(skb);
690 struct hlist_node *node;
691 struct sk_buff *nskb;
692
693 if (use_hash2) {
694 hash2_any = ipv6_portaddr_hash(net, &in6addr_any, hnum) &
695 udptable->mask;
696 hash2 = ipv6_portaddr_hash(net, daddr, hnum) & udptable->mask;
697start_lookup:
698 hslot = &udptable->hash2[hash2];
699 offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node);
700 }
701
702 sk_for_each_entry_offset_rcu(sk, node, &hslot->head, offset) {
703 if (!__udp_v6_is_mcast_sock(net, sk, uh->dest, daddr,
704 uh->source, saddr, dif, hnum))
705 continue;
706
707
708
709 if (!uh->check && !udp_sk(sk)->no_check6_rx)
710 continue;
711 if (!first) {
712 first = sk;
713 continue;
714 }
715 nskb = skb_clone(skb, GFP_ATOMIC);
716 if (unlikely(!nskb)) {
717 atomic_inc(&sk->sk_drops);
718 __UDP6_INC_STATS(net, UDP_MIB_RCVBUFERRORS,
719 IS_UDPLITE(sk));
720 __UDP6_INC_STATS(net, UDP_MIB_INERRORS,
721 IS_UDPLITE(sk));
722 continue;
723 }
724
725 if (udpv6_queue_rcv_skb(sk, nskb) > 0)
726 consume_skb(nskb);
727 }
728
729
730 if (use_hash2 && hash2 != hash2_any) {
731 hash2 = hash2_any;
732 goto start_lookup;
733 }
734
735 if (first) {
736 if (udpv6_queue_rcv_skb(first, skb) > 0)
737 consume_skb(skb);
738 } else {
739 kfree_skb(skb);
740 __UDP6_INC_STATS(net, UDP_MIB_IGNOREDMULTI,
741 proto == IPPROTO_UDPLITE);
742 }
743 return 0;
744}
745
746static void udp6_sk_rx_dst_set(struct sock *sk, struct dst_entry *dst)
747{
748 if (udp_sk_rx_dst_set(sk, dst)) {
749 const struct rt6_info *rt = (const struct rt6_info *)dst;
750
751 inet6_sk(sk)->rx_dst_cookie = rt6_get_cookie(rt);
752 }
753}
754
755
756
757
758static int udp6_unicast_rcv_skb(struct sock *sk, struct sk_buff *skb,
759 struct udphdr *uh)
760{
761 int ret;
762
763 if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk))
764 skb_checksum_try_convert(skb, IPPROTO_UDP, uh->check,
765 ip6_compute_pseudo);
766
767 ret = udpv6_queue_rcv_skb(sk, skb);
768
769
770 if (ret > 0)
771 return ret;
772 return 0;
773}
774
775int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
776 int proto)
777{
778 const struct in6_addr *saddr, *daddr;
779 struct net *net = dev_net(skb->dev);
780 struct udphdr *uh;
781 struct sock *sk;
782 u32 ulen = 0;
783
784 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
785 goto discard;
786
787 saddr = &ipv6_hdr(skb)->saddr;
788 daddr = &ipv6_hdr(skb)->daddr;
789 uh = udp_hdr(skb);
790
791 ulen = ntohs(uh->len);
792 if (ulen > skb->len)
793 goto short_packet;
794
795 if (proto == IPPROTO_UDP) {
796
797
798
799 if (ulen == 0)
800 ulen = skb->len;
801
802 if (ulen < sizeof(*uh))
803 goto short_packet;
804
805 if (ulen < skb->len) {
806 if (pskb_trim_rcsum(skb, ulen))
807 goto short_packet;
808 saddr = &ipv6_hdr(skb)->saddr;
809 daddr = &ipv6_hdr(skb)->daddr;
810 uh = udp_hdr(skb);
811 }
812 }
813
814 if (udp6_csum_init(skb, uh, proto))
815 goto csum_error;
816
817
818 sk = skb_steal_sock(skb);
819 if (sk) {
820 struct dst_entry *dst = skb_dst(skb);
821 int ret;
822
823 if (unlikely(sk->sk_rx_dst != dst))
824 udp6_sk_rx_dst_set(sk, dst);
825
826 if (!uh->check && !udp_sk(sk)->no_check6_rx) {
827 sock_put(sk);
828 goto report_csum_error;
829 }
830
831 ret = udp6_unicast_rcv_skb(sk, skb, uh);
832 sock_put(sk);
833 return ret;
834 }
835
836
837
838
839 if (ipv6_addr_is_multicast(daddr))
840 return __udp6_lib_mcast_deliver(net, skb,
841 saddr, daddr, udptable, proto);
842
843
844 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
845 if (sk) {
846 if (!uh->check && !udp_sk(sk)->no_check6_rx)
847 goto report_csum_error;
848 return udp6_unicast_rcv_skb(sk, skb, uh);
849 }
850
851 if (!uh->check)
852 goto report_csum_error;
853
854 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
855 goto discard;
856
857 if (udp_lib_checksum_complete(skb))
858 goto csum_error;
859
860 __UDP6_INC_STATS(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
861 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
862
863 kfree_skb(skb);
864 return 0;
865
866short_packet:
867 net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n",
868 proto == IPPROTO_UDPLITE ? "-Lite" : "",
869 saddr, ntohs(uh->source),
870 ulen, skb->len,
871 daddr, ntohs(uh->dest));
872 goto discard;
873
874report_csum_error:
875 udp6_csum_zero_error(skb);
876csum_error:
877 __UDP6_INC_STATS(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE);
878discard:
879 __UDP6_INC_STATS(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
880 kfree_skb(skb);
881 return 0;
882}
883
884
885static struct sock *__udp6_lib_demux_lookup(struct net *net,
886 __be16 loc_port, const struct in6_addr *loc_addr,
887 __be16 rmt_port, const struct in6_addr *rmt_addr,
888 int dif, int sdif)
889{
890 unsigned short hnum = ntohs(loc_port);
891 unsigned int hash2 = ipv6_portaddr_hash(net, loc_addr, hnum);
892 unsigned int slot2 = hash2 & udp_table.mask;
893 struct udp_hslot *hslot2 = &udp_table.hash2[slot2];
894 const __portpair ports = INET_COMBINED_PORTS(rmt_port, hnum);
895 struct sock *sk;
896
897 udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) {
898 if (sk->sk_state == TCP_ESTABLISHED &&
899 INET6_MATCH(sk, net, rmt_addr, loc_addr, ports, dif, sdif))
900 return sk;
901
902 break;
903 }
904 return NULL;
905}
906
907static void udp_v6_early_demux(struct sk_buff *skb)
908{
909 struct net *net = dev_net(skb->dev);
910 const struct udphdr *uh;
911 struct sock *sk;
912 struct dst_entry *dst;
913 int dif = skb->dev->ifindex;
914 int sdif = inet6_sdif(skb);
915
916 if (!pskb_may_pull(skb, skb_transport_offset(skb) +
917 sizeof(struct udphdr)))
918 return;
919
920 uh = udp_hdr(skb);
921
922 if (skb->pkt_type == PACKET_HOST)
923 sk = __udp6_lib_demux_lookup(net, uh->dest,
924 &ipv6_hdr(skb)->daddr,
925 uh->source, &ipv6_hdr(skb)->saddr,
926 dif, sdif);
927 else
928 return;
929
930 if (!sk || !refcount_inc_not_zero(&sk->sk_refcnt))
931 return;
932
933 skb->sk = sk;
934 skb->destructor = sock_efree;
935 dst = READ_ONCE(sk->sk_rx_dst);
936
937 if (dst)
938 dst = dst_check(dst, inet6_sk(sk)->rx_dst_cookie);
939 if (dst) {
940
941
942
943
944 skb_dst_set_noref(skb, dst);
945 }
946}
947
948static __inline__ int udpv6_rcv(struct sk_buff *skb)
949{
950 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP);
951}
952
953
954
955
956static void udp_v6_flush_pending_frames(struct sock *sk)
957{
958 struct udp_sock *up = udp_sk(sk);
959
960 if (up->pending == AF_INET)
961 udp_flush_pending_frames(sk);
962 else if (up->pending) {
963 up->len = 0;
964 up->pending = 0;
965 ip6_flush_pending_frames(sk);
966 }
967}
968
969static int udpv6_pre_connect(struct sock *sk, struct sockaddr *uaddr,
970 int addr_len)
971{
972
973
974
975
976 if (uaddr->sa_family == AF_INET) {
977 if (__ipv6_only_sock(sk))
978 return -EAFNOSUPPORT;
979 return udp_pre_connect(sk, uaddr, addr_len);
980 }
981
982 if (addr_len < SIN6_LEN_RFC2133)
983 return -EINVAL;
984
985 return BPF_CGROUP_RUN_PROG_INET6_CONNECT_LOCK(sk, uaddr);
986}
987
988
989
990
991
992
993
994static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
995 const struct in6_addr *saddr,
996 const struct in6_addr *daddr, int len)
997{
998 unsigned int offset;
999 struct udphdr *uh = udp_hdr(skb);
1000 struct sk_buff *frags = skb_shinfo(skb)->frag_list;
1001 __wsum csum = 0;
1002
1003 if (!frags) {
1004
1005 skb->csum_start = skb_transport_header(skb) - skb->head;
1006 skb->csum_offset = offsetof(struct udphdr, check);
1007 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0);
1008 } else {
1009
1010
1011
1012
1013
1014 offset = skb_transport_offset(skb);
1015 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
1016 csum = skb->csum;
1017
1018 skb->ip_summed = CHECKSUM_NONE;
1019
1020 do {
1021 csum = csum_add(csum, frags->csum);
1022 } while ((frags = frags->next));
1023
1024 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP,
1025 csum);
1026 if (uh->check == 0)
1027 uh->check = CSUM_MANGLED_0;
1028 }
1029}
1030
1031
1032
1033
1034
1035static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6,
1036 struct inet_cork *cork)
1037{
1038 struct sock *sk = skb->sk;
1039 struct udphdr *uh;
1040 int err = 0;
1041 int is_udplite = IS_UDPLITE(sk);
1042 __wsum csum = 0;
1043 int offset = skb_transport_offset(skb);
1044 int len = skb->len - offset;
1045
1046
1047
1048
1049 uh = udp_hdr(skb);
1050 uh->source = fl6->fl6_sport;
1051 uh->dest = fl6->fl6_dport;
1052 uh->len = htons(len);
1053 uh->check = 0;
1054
1055 if (cork->gso_size) {
1056 const int hlen = skb_network_header_len(skb) +
1057 sizeof(struct udphdr);
1058
1059 if (hlen + cork->gso_size > cork->fragsize)
1060 return -EINVAL;
1061 if (skb->len > cork->gso_size * UDP_MAX_SEGMENTS)
1062 return -EINVAL;
1063 if (udp_sk(sk)->no_check6_tx)
1064 return -EINVAL;
1065 if (skb->ip_summed != CHECKSUM_PARTIAL || is_udplite ||
1066 dst_xfrm(skb_dst(skb)))
1067 return -EIO;
1068
1069 skb_shinfo(skb)->gso_size = cork->gso_size;
1070 skb_shinfo(skb)->gso_type = SKB_GSO_UDP_L4;
1071 goto csum_partial;
1072 }
1073
1074 if (is_udplite)
1075 csum = udplite_csum(skb);
1076 else if (udp_sk(sk)->no_check6_tx) {
1077 skb->ip_summed = CHECKSUM_NONE;
1078 goto send;
1079 } else if (skb->ip_summed == CHECKSUM_PARTIAL) {
1080csum_partial:
1081 udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, len);
1082 goto send;
1083 } else
1084 csum = udp_csum(skb);
1085
1086
1087 uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
1088 len, fl6->flowi6_proto, csum);
1089 if (uh->check == 0)
1090 uh->check = CSUM_MANGLED_0;
1091
1092send:
1093 err = ip6_send_skb(skb);
1094 if (err) {
1095 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) {
1096 UDP6_INC_STATS(sock_net(sk),
1097 UDP_MIB_SNDBUFERRORS, is_udplite);
1098 err = 0;
1099 }
1100 } else {
1101 UDP6_INC_STATS(sock_net(sk),
1102 UDP_MIB_OUTDATAGRAMS, is_udplite);
1103 }
1104 return err;
1105}
1106
1107static int udp_v6_push_pending_frames(struct sock *sk)
1108{
1109 struct sk_buff *skb;
1110 struct udp_sock *up = udp_sk(sk);
1111 struct flowi6 fl6;
1112 int err = 0;
1113
1114 if (up->pending == AF_INET)
1115 return udp_push_pending_frames(sk);
1116
1117
1118
1119
1120 fl6 = inet_sk(sk)->cork.fl.u.ip6;
1121
1122 skb = ip6_finish_skb(sk);
1123 if (!skb)
1124 goto out;
1125
1126 err = udp_v6_send_skb(skb, &fl6, &inet_sk(sk)->cork.base);
1127
1128out:
1129 up->len = 0;
1130 up->pending = 0;
1131 return err;
1132}
1133
1134int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
1135{
1136 struct ipv6_txoptions opt_space;
1137 struct udp_sock *up = udp_sk(sk);
1138 struct inet_sock *inet = inet_sk(sk);
1139 struct ipv6_pinfo *np = inet6_sk(sk);
1140 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
1141 struct in6_addr *daddr, *final_p, final;
1142 struct ipv6_txoptions *opt = NULL;
1143 struct ipv6_txoptions *opt_to_free = NULL;
1144 struct ip6_flowlabel *flowlabel = NULL;
1145 struct flowi6 fl6;
1146 struct dst_entry *dst;
1147 struct ipcm6_cookie ipc6;
1148 int addr_len = msg->msg_namelen;
1149 bool connected = false;
1150 int ulen = len;
1151 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
1152 int err;
1153 int is_udplite = IS_UDPLITE(sk);
1154 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
1155
1156 ipcm6_init(&ipc6);
1157 ipc6.gso_size = up->gso_size;
1158 ipc6.sockc.tsflags = sk->sk_tsflags;
1159
1160
1161 if (sin6) {
1162 if (addr_len < offsetof(struct sockaddr, sa_data))
1163 return -EINVAL;
1164
1165 switch (sin6->sin6_family) {
1166 case AF_INET6:
1167 if (addr_len < SIN6_LEN_RFC2133)
1168 return -EINVAL;
1169 daddr = &sin6->sin6_addr;
1170 if (ipv6_addr_any(daddr) &&
1171 ipv6_addr_v4mapped(&np->saddr))
1172 ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK),
1173 daddr);
1174 break;
1175 case AF_INET:
1176 goto do_udp_sendmsg;
1177 case AF_UNSPEC:
1178 msg->msg_name = sin6 = NULL;
1179 msg->msg_namelen = addr_len = 0;
1180 daddr = NULL;
1181 break;
1182 default:
1183 return -EINVAL;
1184 }
1185 } else if (!up->pending) {
1186 if (sk->sk_state != TCP_ESTABLISHED)
1187 return -EDESTADDRREQ;
1188 daddr = &sk->sk_v6_daddr;
1189 } else
1190 daddr = NULL;
1191
1192 if (daddr) {
1193 if (ipv6_addr_v4mapped(daddr)) {
1194 struct sockaddr_in sin;
1195 sin.sin_family = AF_INET;
1196 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport;
1197 sin.sin_addr.s_addr = daddr->s6_addr32[3];
1198 msg->msg_name = &sin;
1199 msg->msg_namelen = sizeof(sin);
1200do_udp_sendmsg:
1201 if (__ipv6_only_sock(sk))
1202 return -ENETUNREACH;
1203 return udp_sendmsg(sk, msg, len);
1204 }
1205 }
1206
1207 if (up->pending == AF_INET)
1208 return udp_sendmsg(sk, msg, len);
1209
1210
1211
1212
1213 if (len > INT_MAX - sizeof(struct udphdr))
1214 return -EMSGSIZE;
1215
1216 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
1217 if (up->pending) {
1218
1219
1220
1221
1222 lock_sock(sk);
1223 if (likely(up->pending)) {
1224 if (unlikely(up->pending != AF_INET6)) {
1225 release_sock(sk);
1226 return -EAFNOSUPPORT;
1227 }
1228 dst = NULL;
1229 goto do_append_data;
1230 }
1231 release_sock(sk);
1232 }
1233 ulen += sizeof(struct udphdr);
1234
1235 memset(&fl6, 0, sizeof(fl6));
1236
1237 if (sin6) {
1238 if (sin6->sin6_port == 0)
1239 return -EINVAL;
1240
1241 fl6.fl6_dport = sin6->sin6_port;
1242 daddr = &sin6->sin6_addr;
1243
1244 if (np->sndflow) {
1245 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
1246 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
1247 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1248 if (!flowlabel)
1249 return -EINVAL;
1250 }
1251 }
1252
1253
1254
1255
1256
1257 if (sk->sk_state == TCP_ESTABLISHED &&
1258 ipv6_addr_equal(daddr, &sk->sk_v6_daddr))
1259 daddr = &sk->sk_v6_daddr;
1260
1261 if (addr_len >= sizeof(struct sockaddr_in6) &&
1262 sin6->sin6_scope_id &&
1263 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
1264 fl6.flowi6_oif = sin6->sin6_scope_id;
1265 } else {
1266 if (sk->sk_state != TCP_ESTABLISHED)
1267 return -EDESTADDRREQ;
1268
1269 fl6.fl6_dport = inet->inet_dport;
1270 daddr = &sk->sk_v6_daddr;
1271 fl6.flowlabel = np->flow_label;
1272 connected = true;
1273 }
1274
1275 if (!fl6.flowi6_oif)
1276 fl6.flowi6_oif = sk->sk_bound_dev_if;
1277
1278 if (!fl6.flowi6_oif)
1279 fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex;
1280
1281 fl6.flowi6_mark = sk->sk_mark;
1282 fl6.flowi6_uid = sk->sk_uid;
1283
1284 if (msg->msg_controllen) {
1285 opt = &opt_space;
1286 memset(opt, 0, sizeof(struct ipv6_txoptions));
1287 opt->tot_len = sizeof(*opt);
1288 ipc6.opt = opt;
1289
1290 err = udp_cmsg_send(sk, msg, &ipc6.gso_size);
1291 if (err > 0)
1292 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6,
1293 &ipc6);
1294 if (err < 0) {
1295 fl6_sock_release(flowlabel);
1296 return err;
1297 }
1298 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
1299 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1300 if (!flowlabel)
1301 return -EINVAL;
1302 }
1303 if (!(opt->opt_nflen|opt->opt_flen))
1304 opt = NULL;
1305 connected = false;
1306 }
1307 if (!opt) {
1308 opt = txopt_get(np);
1309 opt_to_free = opt;
1310 }
1311 if (flowlabel)
1312 opt = fl6_merge_options(&opt_space, flowlabel, opt);
1313 opt = ipv6_fixup_options(&opt_space, opt);
1314 ipc6.opt = opt;
1315
1316 fl6.flowi6_proto = sk->sk_protocol;
1317 if (!ipv6_addr_any(daddr))
1318 fl6.daddr = *daddr;
1319 else
1320 fl6.daddr.s6_addr[15] = 0x1;
1321 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
1322 fl6.saddr = np->saddr;
1323 fl6.fl6_sport = inet->inet_sport;
1324
1325 if (cgroup_bpf_enabled && !connected) {
1326 err = BPF_CGROUP_RUN_PROG_UDP6_SENDMSG_LOCK(sk,
1327 (struct sockaddr *)sin6, &fl6.saddr);
1328 if (err)
1329 goto out_no_dst;
1330 if (sin6) {
1331 if (ipv6_addr_v4mapped(&sin6->sin6_addr)) {
1332
1333
1334
1335 err = -ENOTSUPP;
1336 goto out_no_dst;
1337 }
1338 if (sin6->sin6_port == 0) {
1339
1340 err = -EINVAL;
1341 goto out_no_dst;
1342 }
1343 fl6.fl6_dport = sin6->sin6_port;
1344 fl6.daddr = sin6->sin6_addr;
1345 }
1346 }
1347
1348 final_p = fl6_update_dst(&fl6, opt, &final);
1349 if (final_p)
1350 connected = false;
1351
1352 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) {
1353 fl6.flowi6_oif = np->mcast_oif;
1354 connected = false;
1355 } else if (!fl6.flowi6_oif)
1356 fl6.flowi6_oif = np->ucast_oif;
1357
1358 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
1359
1360 if (ipc6.tclass < 0)
1361 ipc6.tclass = np->tclass;
1362
1363 fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel);
1364
1365 dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p, connected);
1366 if (IS_ERR(dst)) {
1367 err = PTR_ERR(dst);
1368 dst = NULL;
1369 goto out;
1370 }
1371
1372 if (ipc6.hlimit < 0)
1373 ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
1374
1375 if (msg->msg_flags&MSG_CONFIRM)
1376 goto do_confirm;
1377back_from_confirm:
1378
1379
1380 if (!corkreq) {
1381 struct inet_cork_full cork;
1382 struct sk_buff *skb;
1383
1384 skb = ip6_make_skb(sk, getfrag, msg, ulen,
1385 sizeof(struct udphdr), &ipc6,
1386 &fl6, (struct rt6_info *)dst,
1387 msg->msg_flags, &cork);
1388 err = PTR_ERR(skb);
1389 if (!IS_ERR_OR_NULL(skb))
1390 err = udp_v6_send_skb(skb, &fl6, &cork.base);
1391 goto out;
1392 }
1393
1394 lock_sock(sk);
1395 if (unlikely(up->pending)) {
1396
1397
1398 release_sock(sk);
1399
1400 net_dbg_ratelimited("udp cork app bug 2\n");
1401 err = -EINVAL;
1402 goto out;
1403 }
1404
1405 up->pending = AF_INET6;
1406
1407do_append_data:
1408 if (ipc6.dontfrag < 0)
1409 ipc6.dontfrag = np->dontfrag;
1410 up->len += ulen;
1411 err = ip6_append_data(sk, getfrag, msg, ulen, sizeof(struct udphdr),
1412 &ipc6, &fl6, (struct rt6_info *)dst,
1413 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
1414 if (err)
1415 udp_v6_flush_pending_frames(sk);
1416 else if (!corkreq)
1417 err = udp_v6_push_pending_frames(sk);
1418 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
1419 up->pending = 0;
1420
1421 if (err > 0)
1422 err = np->recverr ? net_xmit_errno(err) : 0;
1423 release_sock(sk);
1424
1425out:
1426 dst_release(dst);
1427out_no_dst:
1428 fl6_sock_release(flowlabel);
1429 txopt_put(opt_to_free);
1430 if (!err)
1431 return len;
1432
1433
1434
1435
1436
1437
1438
1439 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
1440 UDP6_INC_STATS(sock_net(sk),
1441 UDP_MIB_SNDBUFERRORS, is_udplite);
1442 }
1443 return err;
1444
1445do_confirm:
1446 if (msg->msg_flags & MSG_PROBE)
1447 dst_confirm_neigh(dst, &fl6.daddr);
1448 if (!(msg->msg_flags&MSG_PROBE) || len)
1449 goto back_from_confirm;
1450 err = 0;
1451 goto out;
1452}
1453
1454void udpv6_destroy_sock(struct sock *sk)
1455{
1456 struct udp_sock *up = udp_sk(sk);
1457 lock_sock(sk);
1458 udp_v6_flush_pending_frames(sk);
1459 release_sock(sk);
1460
1461 if (static_branch_unlikely(&udpv6_encap_needed_key) && up->encap_type) {
1462 void (*encap_destroy)(struct sock *sk);
1463 encap_destroy = READ_ONCE(up->encap_destroy);
1464 if (encap_destroy)
1465 encap_destroy(sk);
1466 }
1467
1468 inet6_destroy_sock(sk);
1469}
1470
1471
1472
1473
1474int udpv6_setsockopt(struct sock *sk, int level, int optname,
1475 char __user *optval, unsigned int optlen)
1476{
1477 if (level == SOL_UDP || level == SOL_UDPLITE)
1478 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1479 udp_v6_push_pending_frames);
1480 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1481}
1482
1483#ifdef CONFIG_COMPAT
1484int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
1485 char __user *optval, unsigned int optlen)
1486{
1487 if (level == SOL_UDP || level == SOL_UDPLITE)
1488 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1489 udp_v6_push_pending_frames);
1490 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
1491}
1492#endif
1493
1494int udpv6_getsockopt(struct sock *sk, int level, int optname,
1495 char __user *optval, int __user *optlen)
1496{
1497 if (level == SOL_UDP || level == SOL_UDPLITE)
1498 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1499 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1500}
1501
1502#ifdef CONFIG_COMPAT
1503int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
1504 char __user *optval, int __user *optlen)
1505{
1506 if (level == SOL_UDP || level == SOL_UDPLITE)
1507 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1508 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
1509}
1510#endif
1511
1512
1513
1514
1515static struct inet6_protocol udpv6_protocol = {
1516 .early_demux = udp_v6_early_demux,
1517 .early_demux_handler = udp_v6_early_demux,
1518 .handler = udpv6_rcv,
1519 .err_handler = udpv6_err,
1520 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1521};
1522
1523
1524#ifdef CONFIG_PROC_FS
1525int udp6_seq_show(struct seq_file *seq, void *v)
1526{
1527 if (v == SEQ_START_TOKEN) {
1528 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
1529 } else {
1530 int bucket = ((struct udp_iter_state *)seq->private)->bucket;
1531 struct inet_sock *inet = inet_sk(v);
1532 __u16 srcp = ntohs(inet->inet_sport);
1533 __u16 destp = ntohs(inet->inet_dport);
1534 __ip6_dgram_sock_seq_show(seq, v, srcp, destp,
1535 udp_rqueue_get(v), bucket);
1536 }
1537 return 0;
1538}
1539
1540const struct seq_operations udp6_seq_ops = {
1541 .start = udp_seq_start,
1542 .next = udp_seq_next,
1543 .stop = udp_seq_stop,
1544 .show = udp6_seq_show,
1545};
1546EXPORT_SYMBOL(udp6_seq_ops);
1547
1548static struct udp_seq_afinfo udp6_seq_afinfo = {
1549 .family = AF_INET6,
1550 .udp_table = &udp_table,
1551};
1552
1553int __net_init udp6_proc_init(struct net *net)
1554{
1555 if (!proc_create_net_data("udp6", 0444, net->proc_net, &udp6_seq_ops,
1556 sizeof(struct udp_iter_state), &udp6_seq_afinfo))
1557 return -ENOMEM;
1558 return 0;
1559}
1560
1561void udp6_proc_exit(struct net *net)
1562{
1563 remove_proc_entry("udp6", net->proc_net);
1564}
1565#endif
1566
1567
1568
1569struct proto udpv6_prot = {
1570 .name = "UDPv6",
1571 .owner = THIS_MODULE,
1572 .close = udp_lib_close,
1573 .pre_connect = udpv6_pre_connect,
1574 .connect = ip6_datagram_connect,
1575 .disconnect = udp_disconnect,
1576 .ioctl = udp_ioctl,
1577 .init = udp_init_sock,
1578 .destroy = udpv6_destroy_sock,
1579 .setsockopt = udpv6_setsockopt,
1580 .getsockopt = udpv6_getsockopt,
1581 .sendmsg = udpv6_sendmsg,
1582 .recvmsg = udpv6_recvmsg,
1583 .release_cb = ip6_datagram_release_cb,
1584 .hash = udp_lib_hash,
1585 .unhash = udp_lib_unhash,
1586 .rehash = udp_v6_rehash,
1587 .get_port = udp_v6_get_port,
1588 .memory_allocated = &udp_memory_allocated,
1589 .sysctl_mem = sysctl_udp_mem,
1590 .sysctl_wmem_offset = offsetof(struct net, ipv4.sysctl_udp_wmem_min),
1591 .sysctl_rmem_offset = offsetof(struct net, ipv4.sysctl_udp_rmem_min),
1592 .obj_size = sizeof(struct udp6_sock),
1593 .h.udp_table = &udp_table,
1594#ifdef CONFIG_COMPAT
1595 .compat_setsockopt = compat_udpv6_setsockopt,
1596 .compat_getsockopt = compat_udpv6_getsockopt,
1597#endif
1598 .diag_destroy = udp_abort,
1599};
1600
1601static struct inet_protosw udpv6_protosw = {
1602 .type = SOCK_DGRAM,
1603 .protocol = IPPROTO_UDP,
1604 .prot = &udpv6_prot,
1605 .ops = &inet6_dgram_ops,
1606 .flags = INET_PROTOSW_PERMANENT,
1607};
1608
1609int __init udpv6_init(void)
1610{
1611 int ret;
1612
1613 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
1614 if (ret)
1615 goto out;
1616
1617 ret = inet6_register_protosw(&udpv6_protosw);
1618 if (ret)
1619 goto out_udpv6_protocol;
1620out:
1621 return ret;
1622
1623out_udpv6_protocol:
1624 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1625 goto out;
1626}
1627
1628void udpv6_exit(void)
1629{
1630 inet6_unregister_protosw(&udpv6_protosw);
1631 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1632}
1633
