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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#include <linux/indirect_call_wrapper.h>
40
41#include <net/addrconf.h>
42#include <net/ndisc.h>
43#include <net/protocol.h>
44#include <net/transp_v6.h>
45#include <net/ip6_route.h>
46#include <net/raw.h>
47#include <net/tcp_states.h>
48#include <net/ip6_checksum.h>
49#include <net/xfrm.h>
50#include <net/inet_hashtables.h>
51#include <net/inet6_hashtables.h>
52#include <net/busy_poll.h>
53#include <net/sock_reuseport.h>
54
55#include <linux/proc_fs.h>
56#include <linux/seq_file.h>
57#include <trace/events/skb.h>
58#include "udp_impl.h"
59
60static bool udp6_lib_exact_dif_match(struct net *net, struct sk_buff *skb)
61{
62#if defined(CONFIG_NET_L3_MASTER_DEV)
63 if (!net->ipv4.sysctl_udp_l3mdev_accept &&
64 skb && ipv6_l3mdev_skb(IP6CB(skb)->flags))
65 return true;
66#endif
67 return false;
68}
69
70static u32 udp6_ehashfn(const struct net *net,
71 const struct in6_addr *laddr,
72 const u16 lport,
73 const struct in6_addr *faddr,
74 const __be16 fport)
75{
76 static u32 udp6_ehash_secret __read_mostly;
77 static u32 udp_ipv6_hash_secret __read_mostly;
78
79 u32 lhash, fhash;
80
81 net_get_random_once(&udp6_ehash_secret,
82 sizeof(udp6_ehash_secret));
83 net_get_random_once(&udp_ipv6_hash_secret,
84 sizeof(udp_ipv6_hash_secret));
85
86 lhash = (__force u32)laddr->s6_addr32[3];
87 fhash = __ipv6_addr_jhash(faddr, udp_ipv6_hash_secret);
88
89 return __inet6_ehashfn(lhash, lport, fhash, fport,
90 udp_ipv6_hash_secret + net_hash_mix(net));
91}
92
93int udp_v6_get_port(struct sock *sk, unsigned short snum)
94{
95 unsigned int hash2_nulladdr =
96 ipv6_portaddr_hash(sock_net(sk), &in6addr_any, snum);
97 unsigned int hash2_partial =
98 ipv6_portaddr_hash(sock_net(sk), &sk->sk_v6_rcv_saddr, 0);
99
100
101 udp_sk(sk)->udp_portaddr_hash = hash2_partial;
102 return udp_lib_get_port(sk, snum, hash2_nulladdr);
103}
104
105static void udp_v6_rehash(struct sock *sk)
106{
107 u16 new_hash = ipv6_portaddr_hash(sock_net(sk),
108 &sk->sk_v6_rcv_saddr,
109 inet_sk(sk)->inet_num);
110
111 udp_lib_rehash(sk, new_hash);
112}
113
114static int compute_score(struct sock *sk, struct net *net,
115 const struct in6_addr *saddr, __be16 sport,
116 const struct in6_addr *daddr, unsigned short hnum,
117 int dif, int sdif, bool exact_dif)
118{
119 int score;
120 struct inet_sock *inet;
121
122 if (!net_eq(sock_net(sk), net) ||
123 udp_sk(sk)->udp_port_hash != hnum ||
124 sk->sk_family != PF_INET6)
125 return -1;
126
127 score = 0;
128 inet = inet_sk(sk);
129
130 if (inet->inet_dport) {
131 if (inet->inet_dport != sport)
132 return -1;
133 score++;
134 }
135
136 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
137 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr))
138 return -1;
139 score++;
140 }
141
142 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
143 if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr))
144 return -1;
145 score++;
146 }
147
148 if (sk->sk_bound_dev_if || exact_dif) {
149 bool dev_match = (sk->sk_bound_dev_if == dif ||
150 sk->sk_bound_dev_if == sdif);
151
152 if (!dev_match)
153 return -1;
154 if (sk->sk_bound_dev_if)
155 score++;
156 }
157
158 if (sk->sk_incoming_cpu == raw_smp_processor_id())
159 score++;
160
161 return score;
162}
163
164
165static struct sock *udp6_lib_lookup2(struct net *net,
166 const struct in6_addr *saddr, __be16 sport,
167 const struct in6_addr *daddr, unsigned int hnum,
168 int dif, int sdif, bool exact_dif,
169 struct udp_hslot *hslot2, struct sk_buff *skb)
170{
171 struct sock *sk, *result;
172 int score, badness;
173 u32 hash = 0;
174
175 result = NULL;
176 badness = -1;
177 udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) {
178 score = compute_score(sk, net, saddr, sport,
179 daddr, hnum, dif, sdif, exact_dif);
180 if (score > badness) {
181 if (sk->sk_reuseport) {
182 hash = udp6_ehashfn(net, daddr, hnum,
183 saddr, sport);
184
185 result = reuseport_select_sock(sk, hash, skb,
186 sizeof(struct udphdr));
187 if (result)
188 return result;
189 }
190 result = sk;
191 badness = score;
192 }
193 }
194 return result;
195}
196
197
198struct sock *__udp6_lib_lookup(struct net *net,
199 const struct in6_addr *saddr, __be16 sport,
200 const struct in6_addr *daddr, __be16 dport,
201 int dif, int sdif, struct udp_table *udptable,
202 struct sk_buff *skb)
203{
204 struct sock *sk, *result;
205 unsigned short hnum = ntohs(dport);
206 unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask);
207 struct udp_hslot *hslot2, *hslot = &udptable->hash[slot];
208 bool exact_dif = udp6_lib_exact_dif_match(net, skb);
209 int score, badness;
210 u32 hash = 0;
211
212 if (hslot->count > 10) {
213 hash2 = ipv6_portaddr_hash(net, daddr, hnum);
214 slot2 = hash2 & udptable->mask;
215 hslot2 = &udptable->hash2[slot2];
216 if (hslot->count < hslot2->count)
217 goto begin;
218
219 result = udp6_lib_lookup2(net, saddr, sport,
220 daddr, hnum, dif, sdif, exact_dif,
221 hslot2, skb);
222 if (!result) {
223 unsigned int old_slot2 = slot2;
224 hash2 = ipv6_portaddr_hash(net, &in6addr_any, hnum);
225 slot2 = hash2 & udptable->mask;
226
227 if (unlikely(slot2 == old_slot2))
228 return result;
229
230 hslot2 = &udptable->hash2[slot2];
231 if (hslot->count < hslot2->count)
232 goto begin;
233
234 result = udp6_lib_lookup2(net, saddr, sport,
235 daddr, hnum, dif, sdif,
236 exact_dif, hslot2,
237 skb);
238 }
239 if (unlikely(IS_ERR(result)))
240 return NULL;
241 return result;
242 }
243begin:
244 result = NULL;
245 badness = -1;
246 sk_for_each_rcu(sk, &hslot->head) {
247 score = compute_score(sk, net, saddr, sport, daddr, hnum, dif,
248 sdif, exact_dif);
249 if (score > badness) {
250 if (sk->sk_reuseport) {
251 hash = udp6_ehashfn(net, daddr, hnum,
252 saddr, sport);
253 result = reuseport_select_sock(sk, hash, skb,
254 sizeof(struct udphdr));
255 if (unlikely(IS_ERR(result)))
256 return NULL;
257 if (result)
258 return result;
259 }
260 result = sk;
261 badness = score;
262 }
263 }
264 return result;
265}
266EXPORT_SYMBOL_GPL(__udp6_lib_lookup);
267
268static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb,
269 __be16 sport, __be16 dport,
270 struct udp_table *udptable)
271{
272 const struct ipv6hdr *iph = ipv6_hdr(skb);
273
274 return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport,
275 &iph->daddr, dport, inet6_iif(skb),
276 inet6_sdif(skb), udptable, skb);
277}
278
279struct sock *udp6_lib_lookup_skb(struct sk_buff *skb,
280 __be16 sport, __be16 dport)
281{
282 const struct ipv6hdr *iph = ipv6_hdr(skb);
283
284 return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport,
285 &iph->daddr, dport, inet6_iif(skb),
286 inet6_sdif(skb), &udp_table, skb);
287}
288EXPORT_SYMBOL_GPL(udp6_lib_lookup_skb);
289
290
291
292
293#if IS_ENABLED(CONFIG_NF_TPROXY_IPV6) || IS_ENABLED(CONFIG_NF_SOCKET_IPV6)
294struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport,
295 const struct in6_addr *daddr, __be16 dport, int dif)
296{
297 struct sock *sk;
298
299 sk = __udp6_lib_lookup(net, saddr, sport, daddr, dport,
300 dif, 0, &udp_table, NULL);
301 if (sk && !refcount_inc_not_zero(&sk->sk_refcnt))
302 sk = NULL;
303 return sk;
304}
305EXPORT_SYMBOL_GPL(udp6_lib_lookup);
306#endif
307
308
309
310
311
312static int udp6_skb_len(struct sk_buff *skb)
313{
314 return unlikely(inet6_is_jumbogram(skb)) ? skb->len : udp_skb_len(skb);
315}
316
317
318
319
320
321
322int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
323 int noblock, int flags, int *addr_len)
324{
325 struct ipv6_pinfo *np = inet6_sk(sk);
326 struct inet_sock *inet = inet_sk(sk);
327 struct sk_buff *skb;
328 unsigned int ulen, copied;
329 int peeked, peeking, off;
330 int err;
331 int is_udplite = IS_UDPLITE(sk);
332 bool checksum_valid = false;
333 int is_udp4;
334
335 if (flags & MSG_ERRQUEUE)
336 return ipv6_recv_error(sk, msg, len, addr_len);
337
338 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
339 return ipv6_recv_rxpmtu(sk, msg, len, addr_len);
340
341try_again:
342 peeking = flags & MSG_PEEK;
343 off = sk_peek_offset(sk, flags);
344 skb = __skb_recv_udp(sk, flags, noblock, &peeked, &off, &err);
345 if (!skb)
346 return err;
347
348 ulen = udp6_skb_len(skb);
349 copied = len;
350 if (copied > ulen - off)
351 copied = ulen - off;
352 else if (copied < ulen)
353 msg->msg_flags |= MSG_TRUNC;
354
355 is_udp4 = (skb->protocol == htons(ETH_P_IP));
356
357
358
359
360
361
362
363 if (copied < ulen || peeking ||
364 (is_udplite && UDP_SKB_CB(skb)->partial_cov)) {
365 checksum_valid = udp_skb_csum_unnecessary(skb) ||
366 !__udp_lib_checksum_complete(skb);
367 if (!checksum_valid)
368 goto csum_copy_err;
369 }
370
371 if (checksum_valid || udp_skb_csum_unnecessary(skb)) {
372 if (udp_skb_is_linear(skb))
373 err = copy_linear_skb(skb, copied, off, &msg->msg_iter);
374 else
375 err = skb_copy_datagram_msg(skb, off, msg, copied);
376 } else {
377 err = skb_copy_and_csum_datagram_msg(skb, off, msg);
378 if (err == -EINVAL)
379 goto csum_copy_err;
380 }
381 if (unlikely(err)) {
382 if (!peeked) {
383 atomic_inc(&sk->sk_drops);
384 if (is_udp4)
385 UDP_INC_STATS(sock_net(sk), UDP_MIB_INERRORS,
386 is_udplite);
387 else
388 UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS,
389 is_udplite);
390 }
391 kfree_skb(skb);
392 return err;
393 }
394 if (!peeked) {
395 if (is_udp4)
396 UDP_INC_STATS(sock_net(sk), UDP_MIB_INDATAGRAMS,
397 is_udplite);
398 else
399 UDP6_INC_STATS(sock_net(sk), UDP_MIB_INDATAGRAMS,
400 is_udplite);
401 }
402
403 sock_recv_ts_and_drops(msg, sk, skb);
404
405
406 if (msg->msg_name) {
407 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
408 sin6->sin6_family = AF_INET6;
409 sin6->sin6_port = udp_hdr(skb)->source;
410 sin6->sin6_flowinfo = 0;
411
412 if (is_udp4) {
413 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
414 &sin6->sin6_addr);
415 sin6->sin6_scope_id = 0;
416 } else {
417 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
418 sin6->sin6_scope_id =
419 ipv6_iface_scope_id(&sin6->sin6_addr,
420 inet6_iif(skb));
421 }
422 *addr_len = sizeof(*sin6);
423 }
424
425 if (np->rxopt.all)
426 ip6_datagram_recv_common_ctl(sk, msg, skb);
427
428 if (is_udp4) {
429 if (inet->cmsg_flags)
430 ip_cmsg_recv_offset(msg, sk, skb,
431 sizeof(struct udphdr), off);
432 } else {
433 if (np->rxopt.all)
434 ip6_datagram_recv_specific_ctl(sk, msg, skb);
435 }
436
437 err = copied;
438 if (flags & MSG_TRUNC)
439 err = ulen;
440
441 skb_consume_udp(sk, skb, peeking ? -err : err);
442 return err;
443
444csum_copy_err:
445 if (!__sk_queue_drop_skb(sk, &udp_sk(sk)->reader_queue, skb, flags,
446 udp_skb_destructor)) {
447 if (is_udp4) {
448 UDP_INC_STATS(sock_net(sk),
449 UDP_MIB_CSUMERRORS, is_udplite);
450 UDP_INC_STATS(sock_net(sk),
451 UDP_MIB_INERRORS, is_udplite);
452 } else {
453 UDP6_INC_STATS(sock_net(sk),
454 UDP_MIB_CSUMERRORS, is_udplite);
455 UDP6_INC_STATS(sock_net(sk),
456 UDP_MIB_INERRORS, is_udplite);
457 }
458 }
459 kfree_skb(skb);
460
461
462 cond_resched();
463 msg->msg_flags &= ~MSG_TRUNC;
464 goto try_again;
465}
466
467DEFINE_STATIC_KEY_FALSE(udpv6_encap_needed_key);
468void udpv6_encap_enable(void)
469{
470 static_branch_enable(&udpv6_encap_needed_key);
471}
472EXPORT_SYMBOL(udpv6_encap_enable);
473
474
475
476
477
478
479
480
481
482
483
484
485
486static struct sock *__udp6_lib_err_encap(struct net *net,
487 const struct ipv6hdr *hdr, int offset,
488 struct udphdr *uh,
489 struct udp_table *udptable,
490 struct sk_buff *skb)
491{
492 int (*lookup)(struct sock *sk, struct sk_buff *skb);
493 int network_offset, transport_offset;
494 struct udp_sock *up;
495 struct sock *sk;
496
497 sk = __udp6_lib_lookup(net, &hdr->daddr, uh->source,
498 &hdr->saddr, uh->dest,
499 inet6_iif(skb), 0, udptable, skb);
500 if (!sk)
501 return NULL;
502
503 network_offset = skb_network_offset(skb);
504 transport_offset = skb_transport_offset(skb);
505
506
507 skb_reset_network_header(skb);
508
509
510 skb_set_transport_header(skb, offset);
511
512 up = udp_sk(sk);
513 lookup = READ_ONCE(up->encap_err_lookup);
514 if (!lookup || lookup(sk, skb))
515 sk = NULL;
516
517 skb_set_transport_header(skb, transport_offset);
518 skb_set_network_header(skb, network_offset);
519 return sk;
520}
521
522void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
523 u8 type, u8 code, int offset, __be32 info,
524 struct udp_table *udptable)
525{
526 struct ipv6_pinfo *np;
527 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
528 const struct in6_addr *saddr = &hdr->saddr;
529 const struct in6_addr *daddr = &hdr->daddr;
530 struct udphdr *uh = (struct udphdr *)(skb->data+offset);
531 bool tunnel = false;
532 struct sock *sk;
533 int harderr;
534 int err;
535 struct net *net = dev_net(skb->dev);
536
537 sk = __udp6_lib_lookup(net, daddr, uh->dest, saddr, uh->source,
538 inet6_iif(skb), 0, udptable, NULL);
539 if (!sk) {
540
541 if (static_branch_unlikely(&udpv6_encap_needed_key)) {
542 sk = __udp6_lib_err_encap(net, hdr, offset, uh,
543 udptable, skb);
544 }
545
546 if (!sk) {
547 __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev),
548 ICMP6_MIB_INERRORS);
549 return;
550 }
551 tunnel = true;
552 }
553
554 harderr = icmpv6_err_convert(type, code, &err);
555 np = inet6_sk(sk);
556
557 if (type == ICMPV6_PKT_TOOBIG) {
558 if (!ip6_sk_accept_pmtu(sk))
559 goto out;
560 ip6_sk_update_pmtu(skb, sk, info);
561 if (np->pmtudisc != IPV6_PMTUDISC_DONT)
562 harderr = 1;
563 }
564 if (type == NDISC_REDIRECT) {
565 if (tunnel) {
566 ip6_redirect(skb, sock_net(sk), inet6_iif(skb),
567 sk->sk_mark, sk->sk_uid);
568 } else {
569 ip6_sk_redirect(skb, sk);
570 }
571 goto out;
572 }
573
574
575 if (tunnel)
576 goto out;
577
578 if (!np->recverr) {
579 if (!harderr || sk->sk_state != TCP_ESTABLISHED)
580 goto out;
581 } else {
582 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
583 }
584
585 sk->sk_err = err;
586 sk->sk_error_report(sk);
587out:
588 return;
589}
590
591static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
592{
593 int rc;
594
595 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
596 sock_rps_save_rxhash(sk, skb);
597 sk_mark_napi_id(sk, skb);
598 sk_incoming_cpu_update(sk);
599 } else {
600 sk_mark_napi_id_once(sk, skb);
601 }
602
603 rc = __udp_enqueue_schedule_skb(sk, skb);
604 if (rc < 0) {
605 int is_udplite = IS_UDPLITE(sk);
606
607
608 if (rc == -ENOMEM)
609 UDP6_INC_STATS(sock_net(sk),
610 UDP_MIB_RCVBUFERRORS, is_udplite);
611 UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
612 kfree_skb(skb);
613 return -1;
614 }
615
616 return 0;
617}
618
619static __inline__ void udpv6_err(struct sk_buff *skb,
620 struct inet6_skb_parm *opt, u8 type,
621 u8 code, int offset, __be32 info)
622{
623 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table);
624}
625
626static int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
627{
628 struct udp_sock *up = udp_sk(sk);
629 int is_udplite = IS_UDPLITE(sk);
630
631 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
632 goto drop;
633
634 if (static_branch_unlikely(&udpv6_encap_needed_key) && up->encap_type) {
635 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
636
637
638
639
640
641
642
643
644
645
646
647
648
649 encap_rcv = READ_ONCE(up->encap_rcv);
650 if (encap_rcv) {
651 int ret;
652
653
654 if (udp_lib_checksum_complete(skb))
655 goto csum_error;
656
657 ret = encap_rcv(sk, skb);
658 if (ret <= 0) {
659 __UDP_INC_STATS(sock_net(sk),
660 UDP_MIB_INDATAGRAMS,
661 is_udplite);
662 return -ret;
663 }
664 }
665
666
667 }
668
669
670
671
672 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
673
674 if (up->pcrlen == 0) {
675 net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n",
676 UDP_SKB_CB(skb)->cscov, skb->len);
677 goto drop;
678 }
679 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
680 net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n",
681 UDP_SKB_CB(skb)->cscov, up->pcrlen);
682 goto drop;
683 }
684 }
685
686 prefetch(&sk->sk_rmem_alloc);
687 if (rcu_access_pointer(sk->sk_filter) &&
688 udp_lib_checksum_complete(skb))
689 goto csum_error;
690
691 if (sk_filter_trim_cap(sk, skb, sizeof(struct udphdr)))
692 goto drop;
693
694 udp_csum_pull_header(skb);
695
696 skb_dst_drop(skb);
697
698 return __udpv6_queue_rcv_skb(sk, skb);
699
700csum_error:
701 __UDP6_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite);
702drop:
703 __UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
704 atomic_inc(&sk->sk_drops);
705 kfree_skb(skb);
706 return -1;
707}
708
709static bool __udp_v6_is_mcast_sock(struct net *net, struct sock *sk,
710 __be16 loc_port, const struct in6_addr *loc_addr,
711 __be16 rmt_port, const struct in6_addr *rmt_addr,
712 int dif, unsigned short hnum)
713{
714 struct inet_sock *inet = inet_sk(sk);
715
716 if (!net_eq(sock_net(sk), net))
717 return false;
718
719 if (udp_sk(sk)->udp_port_hash != hnum ||
720 sk->sk_family != PF_INET6 ||
721 (inet->inet_dport && inet->inet_dport != rmt_port) ||
722 (!ipv6_addr_any(&sk->sk_v6_daddr) &&
723 !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) ||
724 (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif) ||
725 (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) &&
726 !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr)))
727 return false;
728 if (!inet6_mc_check(sk, loc_addr, rmt_addr))
729 return false;
730 return true;
731}
732
733static void udp6_csum_zero_error(struct sk_buff *skb)
734{
735
736
737
738 net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n",
739 &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source),
740 &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest));
741}
742
743
744
745
746
747static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
748 const struct in6_addr *saddr, const struct in6_addr *daddr,
749 struct udp_table *udptable, int proto)
750{
751 struct sock *sk, *first = NULL;
752 const struct udphdr *uh = udp_hdr(skb);
753 unsigned short hnum = ntohs(uh->dest);
754 struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum);
755 unsigned int offset = offsetof(typeof(*sk), sk_node);
756 unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10);
757 int dif = inet6_iif(skb);
758 struct hlist_node *node;
759 struct sk_buff *nskb;
760
761 if (use_hash2) {
762 hash2_any = ipv6_portaddr_hash(net, &in6addr_any, hnum) &
763 udptable->mask;
764 hash2 = ipv6_portaddr_hash(net, daddr, hnum) & udptable->mask;
765start_lookup:
766 hslot = &udptable->hash2[hash2];
767 offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node);
768 }
769
770 sk_for_each_entry_offset_rcu(sk, node, &hslot->head, offset) {
771 if (!__udp_v6_is_mcast_sock(net, sk, uh->dest, daddr,
772 uh->source, saddr, dif, hnum))
773 continue;
774
775
776
777 if (!uh->check && !udp_sk(sk)->no_check6_rx)
778 continue;
779 if (!first) {
780 first = sk;
781 continue;
782 }
783 nskb = skb_clone(skb, GFP_ATOMIC);
784 if (unlikely(!nskb)) {
785 atomic_inc(&sk->sk_drops);
786 __UDP6_INC_STATS(net, UDP_MIB_RCVBUFERRORS,
787 IS_UDPLITE(sk));
788 __UDP6_INC_STATS(net, UDP_MIB_INERRORS,
789 IS_UDPLITE(sk));
790 continue;
791 }
792
793 if (udpv6_queue_rcv_skb(sk, nskb) > 0)
794 consume_skb(nskb);
795 }
796
797
798 if (use_hash2 && hash2 != hash2_any) {
799 hash2 = hash2_any;
800 goto start_lookup;
801 }
802
803 if (first) {
804 if (udpv6_queue_rcv_skb(first, skb) > 0)
805 consume_skb(skb);
806 } else {
807 kfree_skb(skb);
808 __UDP6_INC_STATS(net, UDP_MIB_IGNOREDMULTI,
809 proto == IPPROTO_UDPLITE);
810 }
811 return 0;
812}
813
814static void udp6_sk_rx_dst_set(struct sock *sk, struct dst_entry *dst)
815{
816 if (udp_sk_rx_dst_set(sk, dst)) {
817 const struct rt6_info *rt = (const struct rt6_info *)dst;
818
819 inet6_sk(sk)->rx_dst_cookie = rt6_get_cookie(rt);
820 }
821}
822
823
824
825
826static int udp6_unicast_rcv_skb(struct sock *sk, struct sk_buff *skb,
827 struct udphdr *uh)
828{
829 int ret;
830
831 if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk))
832 skb_checksum_try_convert(skb, IPPROTO_UDP, uh->check,
833 ip6_compute_pseudo);
834
835 ret = udpv6_queue_rcv_skb(sk, skb);
836
837
838 if (ret > 0)
839 return ret;
840 return 0;
841}
842
843int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
844 int proto)
845{
846 const struct in6_addr *saddr, *daddr;
847 struct net *net = dev_net(skb->dev);
848 struct udphdr *uh;
849 struct sock *sk;
850 u32 ulen = 0;
851
852 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
853 goto discard;
854
855 saddr = &ipv6_hdr(skb)->saddr;
856 daddr = &ipv6_hdr(skb)->daddr;
857 uh = udp_hdr(skb);
858
859 ulen = ntohs(uh->len);
860 if (ulen > skb->len)
861 goto short_packet;
862
863 if (proto == IPPROTO_UDP) {
864
865
866
867 if (ulen == 0)
868 ulen = skb->len;
869
870 if (ulen < sizeof(*uh))
871 goto short_packet;
872
873 if (ulen < skb->len) {
874 if (pskb_trim_rcsum(skb, ulen))
875 goto short_packet;
876 saddr = &ipv6_hdr(skb)->saddr;
877 daddr = &ipv6_hdr(skb)->daddr;
878 uh = udp_hdr(skb);
879 }
880 }
881
882 if (udp6_csum_init(skb, uh, proto))
883 goto csum_error;
884
885
886 sk = skb_steal_sock(skb);
887 if (sk) {
888 struct dst_entry *dst = skb_dst(skb);
889 int ret;
890
891 if (unlikely(sk->sk_rx_dst != dst))
892 udp6_sk_rx_dst_set(sk, dst);
893
894 if (!uh->check && !udp_sk(sk)->no_check6_rx) {
895 sock_put(sk);
896 goto report_csum_error;
897 }
898
899 ret = udp6_unicast_rcv_skb(sk, skb, uh);
900 sock_put(sk);
901 return ret;
902 }
903
904
905
906
907 if (ipv6_addr_is_multicast(daddr))
908 return __udp6_lib_mcast_deliver(net, skb,
909 saddr, daddr, udptable, proto);
910
911
912 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
913 if (sk) {
914 if (!uh->check && !udp_sk(sk)->no_check6_rx)
915 goto report_csum_error;
916 return udp6_unicast_rcv_skb(sk, skb, uh);
917 }
918
919 if (!uh->check)
920 goto report_csum_error;
921
922 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
923 goto discard;
924
925 if (udp_lib_checksum_complete(skb))
926 goto csum_error;
927
928 __UDP6_INC_STATS(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
929 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
930
931 kfree_skb(skb);
932 return 0;
933
934short_packet:
935 net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n",
936 proto == IPPROTO_UDPLITE ? "-Lite" : "",
937 saddr, ntohs(uh->source),
938 ulen, skb->len,
939 daddr, ntohs(uh->dest));
940 goto discard;
941
942report_csum_error:
943 udp6_csum_zero_error(skb);
944csum_error:
945 __UDP6_INC_STATS(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE);
946discard:
947 __UDP6_INC_STATS(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
948 kfree_skb(skb);
949 return 0;
950}
951
952
953static struct sock *__udp6_lib_demux_lookup(struct net *net,
954 __be16 loc_port, const struct in6_addr *loc_addr,
955 __be16 rmt_port, const struct in6_addr *rmt_addr,
956 int dif, int sdif)
957{
958 unsigned short hnum = ntohs(loc_port);
959 unsigned int hash2 = ipv6_portaddr_hash(net, loc_addr, hnum);
960 unsigned int slot2 = hash2 & udp_table.mask;
961 struct udp_hslot *hslot2 = &udp_table.hash2[slot2];
962 const __portpair ports = INET_COMBINED_PORTS(rmt_port, hnum);
963 struct sock *sk;
964
965 udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) {
966 if (sk->sk_state == TCP_ESTABLISHED &&
967 INET6_MATCH(sk, net, rmt_addr, loc_addr, ports, dif, sdif))
968 return sk;
969
970 break;
971 }
972 return NULL;
973}
974
975INDIRECT_CALLABLE_SCOPE void udp_v6_early_demux(struct sk_buff *skb)
976{
977 struct net *net = dev_net(skb->dev);
978 const struct udphdr *uh;
979 struct sock *sk;
980 struct dst_entry *dst;
981 int dif = skb->dev->ifindex;
982 int sdif = inet6_sdif(skb);
983
984 if (!pskb_may_pull(skb, skb_transport_offset(skb) +
985 sizeof(struct udphdr)))
986 return;
987
988 uh = udp_hdr(skb);
989
990 if (skb->pkt_type == PACKET_HOST)
991 sk = __udp6_lib_demux_lookup(net, uh->dest,
992 &ipv6_hdr(skb)->daddr,
993 uh->source, &ipv6_hdr(skb)->saddr,
994 dif, sdif);
995 else
996 return;
997
998 if (!sk || !refcount_inc_not_zero(&sk->sk_refcnt))
999 return;
1000
1001 skb->sk = sk;
1002 skb->destructor = sock_efree;
1003 dst = READ_ONCE(sk->sk_rx_dst);
1004
1005 if (dst)
1006 dst = dst_check(dst, inet6_sk(sk)->rx_dst_cookie);
1007 if (dst) {
1008
1009
1010
1011
1012 skb_dst_set_noref(skb, dst);
1013 }
1014}
1015
1016INDIRECT_CALLABLE_SCOPE int udpv6_rcv(struct sk_buff *skb)
1017{
1018 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP);
1019}
1020
1021
1022
1023
1024static void udp_v6_flush_pending_frames(struct sock *sk)
1025{
1026 struct udp_sock *up = udp_sk(sk);
1027
1028 if (up->pending == AF_INET)
1029 udp_flush_pending_frames(sk);
1030 else if (up->pending) {
1031 up->len = 0;
1032 up->pending = 0;
1033 ip6_flush_pending_frames(sk);
1034 }
1035}
1036
1037static int udpv6_pre_connect(struct sock *sk, struct sockaddr *uaddr,
1038 int addr_len)
1039{
1040 if (addr_len < offsetofend(struct sockaddr, sa_family))
1041 return -EINVAL;
1042
1043
1044
1045
1046 if (uaddr->sa_family == AF_INET) {
1047 if (__ipv6_only_sock(sk))
1048 return -EAFNOSUPPORT;
1049 return udp_pre_connect(sk, uaddr, addr_len);
1050 }
1051
1052 if (addr_len < SIN6_LEN_RFC2133)
1053 return -EINVAL;
1054
1055 return BPF_CGROUP_RUN_PROG_INET6_CONNECT_LOCK(sk, uaddr);
1056}
1057
1058
1059
1060
1061
1062
1063
1064static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
1065 const struct in6_addr *saddr,
1066 const struct in6_addr *daddr, int len)
1067{
1068 unsigned int offset;
1069 struct udphdr *uh = udp_hdr(skb);
1070 struct sk_buff *frags = skb_shinfo(skb)->frag_list;
1071 __wsum csum = 0;
1072
1073 if (!frags) {
1074
1075 skb->csum_start = skb_transport_header(skb) - skb->head;
1076 skb->csum_offset = offsetof(struct udphdr, check);
1077 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0);
1078 } else {
1079
1080
1081
1082
1083
1084 offset = skb_transport_offset(skb);
1085 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
1086 csum = skb->csum;
1087
1088 skb->ip_summed = CHECKSUM_NONE;
1089
1090 do {
1091 csum = csum_add(csum, frags->csum);
1092 } while ((frags = frags->next));
1093
1094 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP,
1095 csum);
1096 if (uh->check == 0)
1097 uh->check = CSUM_MANGLED_0;
1098 }
1099}
1100
1101
1102
1103
1104
1105static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6,
1106 struct inet_cork *cork)
1107{
1108 struct sock *sk = skb->sk;
1109 struct udphdr *uh;
1110 int err = 0;
1111 int is_udplite = IS_UDPLITE(sk);
1112 __wsum csum = 0;
1113 int offset = skb_transport_offset(skb);
1114 int len = skb->len - offset;
1115
1116
1117
1118
1119 uh = udp_hdr(skb);
1120 uh->source = fl6->fl6_sport;
1121 uh->dest = fl6->fl6_dport;
1122 uh->len = htons(len);
1123 uh->check = 0;
1124
1125 if (cork->gso_size) {
1126 const int hlen = skb_network_header_len(skb) +
1127 sizeof(struct udphdr);
1128
1129 if (hlen + cork->gso_size > cork->fragsize) {
1130 kfree_skb(skb);
1131 return -EINVAL;
1132 }
1133 if (skb->len > cork->gso_size * UDP_MAX_SEGMENTS) {
1134 kfree_skb(skb);
1135 return -EINVAL;
1136 }
1137 if (udp_sk(sk)->no_check6_tx) {
1138 kfree_skb(skb);
1139 return -EINVAL;
1140 }
1141 if (skb->ip_summed != CHECKSUM_PARTIAL || is_udplite ||
1142 dst_xfrm(skb_dst(skb))) {
1143 kfree_skb(skb);
1144 return -EIO;
1145 }
1146
1147 skb_shinfo(skb)->gso_size = cork->gso_size;
1148 skb_shinfo(skb)->gso_type = SKB_GSO_UDP_L4;
1149 goto csum_partial;
1150 }
1151
1152 if (is_udplite)
1153 csum = udplite_csum(skb);
1154 else if (udp_sk(sk)->no_check6_tx) {
1155 skb->ip_summed = CHECKSUM_NONE;
1156 goto send;
1157 } else if (skb->ip_summed == CHECKSUM_PARTIAL) {
1158csum_partial:
1159 udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, len);
1160 goto send;
1161 } else
1162 csum = udp_csum(skb);
1163
1164
1165 uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
1166 len, fl6->flowi6_proto, csum);
1167 if (uh->check == 0)
1168 uh->check = CSUM_MANGLED_0;
1169
1170send:
1171 err = ip6_send_skb(skb);
1172 if (err) {
1173 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) {
1174 UDP6_INC_STATS(sock_net(sk),
1175 UDP_MIB_SNDBUFERRORS, is_udplite);
1176 err = 0;
1177 }
1178 } else {
1179 UDP6_INC_STATS(sock_net(sk),
1180 UDP_MIB_OUTDATAGRAMS, is_udplite);
1181 }
1182 return err;
1183}
1184
1185static int udp_v6_push_pending_frames(struct sock *sk)
1186{
1187 struct sk_buff *skb;
1188 struct udp_sock *up = udp_sk(sk);
1189 struct flowi6 fl6;
1190 int err = 0;
1191
1192 if (up->pending == AF_INET)
1193 return udp_push_pending_frames(sk);
1194
1195
1196
1197
1198 fl6 = inet_sk(sk)->cork.fl.u.ip6;
1199
1200 skb = ip6_finish_skb(sk);
1201 if (!skb)
1202 goto out;
1203
1204 err = udp_v6_send_skb(skb, &fl6, &inet_sk(sk)->cork.base);
1205
1206out:
1207 up->len = 0;
1208 up->pending = 0;
1209 return err;
1210}
1211
1212int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
1213{
1214 struct ipv6_txoptions opt_space;
1215 struct udp_sock *up = udp_sk(sk);
1216 struct inet_sock *inet = inet_sk(sk);
1217 struct ipv6_pinfo *np = inet6_sk(sk);
1218 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
1219 struct in6_addr *daddr, *final_p, final;
1220 struct ipv6_txoptions *opt = NULL;
1221 struct ipv6_txoptions *opt_to_free = NULL;
1222 struct ip6_flowlabel *flowlabel = NULL;
1223 struct flowi6 fl6;
1224 struct dst_entry *dst;
1225 struct ipcm6_cookie ipc6;
1226 int addr_len = msg->msg_namelen;
1227 bool connected = false;
1228 int ulen = len;
1229 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
1230 int err;
1231 int is_udplite = IS_UDPLITE(sk);
1232 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
1233 struct sockcm_cookie sockc;
1234
1235 ipc6.hlimit = -1;
1236 ipc6.tclass = -1;
1237 ipc6.dontfrag = -1;
1238 ipc6.gso_size = up->gso_size;
1239 sockc.tsflags = sk->sk_tsflags;
1240 sockc.transmit_time = 0;
1241
1242
1243 if (sin6) {
1244 if (addr_len < offsetof(struct sockaddr, sa_data))
1245 return -EINVAL;
1246
1247 switch (sin6->sin6_family) {
1248 case AF_INET6:
1249 if (addr_len < SIN6_LEN_RFC2133)
1250 return -EINVAL;
1251 daddr = &sin6->sin6_addr;
1252 if (ipv6_addr_any(daddr) &&
1253 ipv6_addr_v4mapped(&np->saddr))
1254 ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK),
1255 daddr);
1256 break;
1257 case AF_INET:
1258 goto do_udp_sendmsg;
1259 case AF_UNSPEC:
1260 msg->msg_name = sin6 = NULL;
1261 msg->msg_namelen = addr_len = 0;
1262 daddr = NULL;
1263 break;
1264 default:
1265 return -EINVAL;
1266 }
1267 } else if (!up->pending) {
1268 if (sk->sk_state != TCP_ESTABLISHED)
1269 return -EDESTADDRREQ;
1270 daddr = &sk->sk_v6_daddr;
1271 } else
1272 daddr = NULL;
1273
1274 if (daddr) {
1275 if (ipv6_addr_v4mapped(daddr)) {
1276 struct sockaddr_in sin;
1277 sin.sin_family = AF_INET;
1278 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport;
1279 sin.sin_addr.s_addr = daddr->s6_addr32[3];
1280 msg->msg_name = &sin;
1281 msg->msg_namelen = sizeof(sin);
1282do_udp_sendmsg:
1283 if (__ipv6_only_sock(sk))
1284 return -ENETUNREACH;
1285 return udp_sendmsg(sk, msg, len);
1286 }
1287 }
1288
1289 if (up->pending == AF_INET)
1290 return udp_sendmsg(sk, msg, len);
1291
1292
1293
1294
1295 if (len > INT_MAX - sizeof(struct udphdr))
1296 return -EMSGSIZE;
1297
1298 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
1299 if (up->pending) {
1300
1301
1302
1303
1304 lock_sock(sk);
1305 if (likely(up->pending)) {
1306 if (unlikely(up->pending != AF_INET6)) {
1307 release_sock(sk);
1308 return -EAFNOSUPPORT;
1309 }
1310 dst = NULL;
1311 goto do_append_data;
1312 }
1313 release_sock(sk);
1314 }
1315 ulen += sizeof(struct udphdr);
1316
1317 memset(&fl6, 0, sizeof(fl6));
1318
1319 if (sin6) {
1320 if (sin6->sin6_port == 0)
1321 return -EINVAL;
1322
1323 fl6.fl6_dport = sin6->sin6_port;
1324 daddr = &sin6->sin6_addr;
1325
1326 if (np->sndflow) {
1327 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
1328 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
1329 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1330 if (!flowlabel)
1331 return -EINVAL;
1332 }
1333 }
1334
1335
1336
1337
1338
1339 if (sk->sk_state == TCP_ESTABLISHED &&
1340 ipv6_addr_equal(daddr, &sk->sk_v6_daddr))
1341 daddr = &sk->sk_v6_daddr;
1342
1343 if (addr_len >= sizeof(struct sockaddr_in6) &&
1344 sin6->sin6_scope_id &&
1345 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
1346 fl6.flowi6_oif = sin6->sin6_scope_id;
1347 } else {
1348 if (sk->sk_state != TCP_ESTABLISHED)
1349 return -EDESTADDRREQ;
1350
1351 fl6.fl6_dport = inet->inet_dport;
1352 daddr = &sk->sk_v6_daddr;
1353 fl6.flowlabel = np->flow_label;
1354 connected = true;
1355 }
1356
1357 if (!fl6.flowi6_oif)
1358 fl6.flowi6_oif = sk->sk_bound_dev_if;
1359
1360 if (!fl6.flowi6_oif)
1361 fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex;
1362
1363 fl6.flowi6_mark = sk->sk_mark;
1364 fl6.flowi6_uid = sk->sk_uid;
1365
1366 if (msg->msg_controllen) {
1367 opt = &opt_space;
1368 memset(opt, 0, sizeof(struct ipv6_txoptions));
1369 opt->tot_len = sizeof(*opt);
1370 ipc6.opt = opt;
1371
1372 err = udp_cmsg_send(sk, msg, &ipc6.gso_size);
1373 if (err > 0)
1374 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6,
1375 &ipc6, &sockc);
1376 if (err < 0) {
1377 fl6_sock_release(flowlabel);
1378 return err;
1379 }
1380 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
1381 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1382 if (!flowlabel)
1383 return -EINVAL;
1384 }
1385 if (!(opt->opt_nflen|opt->opt_flen))
1386 opt = NULL;
1387 connected = false;
1388 }
1389 if (!opt) {
1390 opt = txopt_get(np);
1391 opt_to_free = opt;
1392 }
1393 if (flowlabel)
1394 opt = fl6_merge_options(&opt_space, flowlabel, opt);
1395 opt = ipv6_fixup_options(&opt_space, opt);
1396 ipc6.opt = opt;
1397
1398 fl6.flowi6_proto = sk->sk_protocol;
1399 fl6.daddr = *daddr;
1400 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
1401 fl6.saddr = np->saddr;
1402 fl6.fl6_sport = inet->inet_sport;
1403
1404 if (cgroup_bpf_enabled && !connected) {
1405 err = BPF_CGROUP_RUN_PROG_UDP6_SENDMSG_LOCK(sk,
1406 (struct sockaddr *)sin6, &fl6.saddr);
1407 if (err)
1408 goto out_no_dst;
1409 if (sin6) {
1410 if (ipv6_addr_v4mapped(&sin6->sin6_addr)) {
1411
1412
1413
1414 err = -ENOTSUPP;
1415 goto out_no_dst;
1416 }
1417 if (sin6->sin6_port == 0) {
1418
1419 err = -EINVAL;
1420 goto out_no_dst;
1421 }
1422 fl6.fl6_dport = sin6->sin6_port;
1423 fl6.daddr = sin6->sin6_addr;
1424 }
1425 }
1426
1427 if (ipv6_addr_any(&fl6.daddr))
1428 fl6.daddr.s6_addr[15] = 0x1;
1429
1430 final_p = fl6_update_dst(&fl6, opt, &final);
1431 if (final_p)
1432 connected = false;
1433
1434 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) {
1435 fl6.flowi6_oif = np->mcast_oif;
1436 connected = false;
1437 } else if (!fl6.flowi6_oif)
1438 fl6.flowi6_oif = np->ucast_oif;
1439
1440 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
1441
1442 if (ipc6.tclass < 0)
1443 ipc6.tclass = np->tclass;
1444
1445 fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel);
1446
1447 dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p, connected);
1448 if (IS_ERR(dst)) {
1449 err = PTR_ERR(dst);
1450 dst = NULL;
1451 goto out;
1452 }
1453
1454 if (ipc6.hlimit < 0)
1455 ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
1456
1457 if (msg->msg_flags&MSG_CONFIRM)
1458 goto do_confirm;
1459back_from_confirm:
1460
1461
1462 if (!corkreq) {
1463 struct inet_cork_full cork;
1464 struct sk_buff *skb;
1465
1466 skb = ip6_make_skb(sk, getfrag, msg, ulen,
1467 sizeof(struct udphdr), &ipc6,
1468 &fl6, (struct rt6_info *)dst,
1469 msg->msg_flags, &cork, &sockc);
1470 err = PTR_ERR(skb);
1471 if (!IS_ERR_OR_NULL(skb))
1472 err = udp_v6_send_skb(skb, &fl6, &cork.base);
1473 goto out;
1474 }
1475
1476 lock_sock(sk);
1477 if (unlikely(up->pending)) {
1478
1479
1480 release_sock(sk);
1481
1482 net_dbg_ratelimited("udp cork app bug 2\n");
1483 err = -EINVAL;
1484 goto out;
1485 }
1486
1487 up->pending = AF_INET6;
1488
1489do_append_data:
1490 if (ipc6.dontfrag < 0)
1491 ipc6.dontfrag = np->dontfrag;
1492 up->len += ulen;
1493 err = ip6_append_data(sk, getfrag, msg, ulen, sizeof(struct udphdr),
1494 &ipc6, &fl6, (struct rt6_info *)dst,
1495 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, &sockc);
1496 if (err)
1497 udp_v6_flush_pending_frames(sk);
1498 else if (!corkreq)
1499 err = udp_v6_push_pending_frames(sk);
1500 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
1501 up->pending = 0;
1502
1503 if (err > 0)
1504 err = np->recverr ? net_xmit_errno(err) : 0;
1505 release_sock(sk);
1506
1507out:
1508 dst_release(dst);
1509out_no_dst:
1510 fl6_sock_release(flowlabel);
1511 txopt_put(opt_to_free);
1512 if (!err)
1513 return len;
1514
1515
1516
1517
1518
1519
1520
1521 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
1522 UDP6_INC_STATS(sock_net(sk),
1523 UDP_MIB_SNDBUFERRORS, is_udplite);
1524 }
1525 return err;
1526
1527do_confirm:
1528 if (msg->msg_flags & MSG_PROBE)
1529 dst_confirm_neigh(dst, &fl6.daddr);
1530 if (!(msg->msg_flags&MSG_PROBE) || len)
1531 goto back_from_confirm;
1532 err = 0;
1533 goto out;
1534}
1535
1536void udpv6_destroy_sock(struct sock *sk)
1537{
1538 struct udp_sock *up = udp_sk(sk);
1539 lock_sock(sk);
1540 udp_v6_flush_pending_frames(sk);
1541 release_sock(sk);
1542
1543 if (static_branch_unlikely(&udpv6_encap_needed_key) && up->encap_type) {
1544 void (*encap_destroy)(struct sock *sk);
1545 encap_destroy = READ_ONCE(up->encap_destroy);
1546 if (encap_destroy)
1547 encap_destroy(sk);
1548 }
1549
1550 inet6_destroy_sock(sk);
1551}
1552
1553
1554
1555
1556int udpv6_setsockopt(struct sock *sk, int level, int optname,
1557 char __user *optval, unsigned int optlen)
1558{
1559 if (level == SOL_UDP || level == SOL_UDPLITE)
1560 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1561 udp_v6_push_pending_frames);
1562 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1563}
1564
1565#ifdef CONFIG_COMPAT
1566int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
1567 char __user *optval, unsigned int optlen)
1568{
1569 if (level == SOL_UDP || level == SOL_UDPLITE)
1570 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1571 udp_v6_push_pending_frames);
1572 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
1573}
1574#endif
1575
1576int udpv6_getsockopt(struct sock *sk, int level, int optname,
1577 char __user *optval, int __user *optlen)
1578{
1579 if (level == SOL_UDP || level == SOL_UDPLITE)
1580 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1581 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1582}
1583
1584#ifdef CONFIG_COMPAT
1585int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
1586 char __user *optval, int __user *optlen)
1587{
1588 if (level == SOL_UDP || level == SOL_UDPLITE)
1589 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1590 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
1591}
1592#endif
1593
1594
1595
1596
1597static struct inet6_protocol udpv6_protocol = {
1598 .early_demux = udp_v6_early_demux,
1599 .early_demux_handler = udp_v6_early_demux,
1600 .handler = udpv6_rcv,
1601 .err_handler = udpv6_err,
1602 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1603};
1604
1605
1606#ifdef CONFIG_PROC_FS
1607int udp6_seq_show(struct seq_file *seq, void *v)
1608{
1609 if (v == SEQ_START_TOKEN) {
1610 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
1611 } else {
1612 int bucket = ((struct udp_iter_state *)seq->private)->bucket;
1613 struct inet_sock *inet = inet_sk(v);
1614 __u16 srcp = ntohs(inet->inet_sport);
1615 __u16 destp = ntohs(inet->inet_dport);
1616 __ip6_dgram_sock_seq_show(seq, v, srcp, destp,
1617 udp_rqueue_get(v), bucket);
1618 }
1619 return 0;
1620}
1621
1622const struct seq_operations udp6_seq_ops = {
1623 .start = udp_seq_start,
1624 .next = udp_seq_next,
1625 .stop = udp_seq_stop,
1626 .show = udp6_seq_show,
1627};
1628EXPORT_SYMBOL(udp6_seq_ops);
1629
1630static struct udp_seq_afinfo udp6_seq_afinfo = {
1631 .family = AF_INET6,
1632 .udp_table = &udp_table,
1633};
1634
1635int __net_init udp6_proc_init(struct net *net)
1636{
1637 if (!proc_create_net_data("udp6", 0444, net->proc_net, &udp6_seq_ops,
1638 sizeof(struct udp_iter_state), &udp6_seq_afinfo))
1639 return -ENOMEM;
1640 return 0;
1641}
1642
1643void udp6_proc_exit(struct net *net)
1644{
1645 remove_proc_entry("udp6", net->proc_net);
1646}
1647#endif
1648
1649
1650
1651struct proto udpv6_prot = {
1652 .name = "UDPv6",
1653 .owner = THIS_MODULE,
1654 .close = udp_lib_close,
1655 .pre_connect = udpv6_pre_connect,
1656 .connect = ip6_datagram_connect,
1657 .disconnect = udp_disconnect,
1658 .ioctl = udp_ioctl,
1659 .init = udp_init_sock,
1660 .destroy = udpv6_destroy_sock,
1661 .setsockopt = udpv6_setsockopt,
1662 .getsockopt = udpv6_getsockopt,
1663 .sendmsg = udpv6_sendmsg,
1664 .recvmsg = udpv6_recvmsg,
1665 .release_cb = ip6_datagram_release_cb,
1666 .hash = udp_lib_hash,
1667 .unhash = udp_lib_unhash,
1668 .rehash = udp_v6_rehash,
1669 .get_port = udp_v6_get_port,
1670 .memory_allocated = &udp_memory_allocated,
1671 .sysctl_mem = sysctl_udp_mem,
1672 .sysctl_wmem_offset = offsetof(struct net, ipv4.sysctl_udp_wmem_min),
1673 .sysctl_rmem_offset = offsetof(struct net, ipv4.sysctl_udp_rmem_min),
1674 .obj_size = sizeof(struct udp6_sock),
1675 .h.udp_table = &udp_table,
1676#ifdef CONFIG_COMPAT
1677 .compat_setsockopt = compat_udpv6_setsockopt,
1678 .compat_getsockopt = compat_udpv6_getsockopt,
1679#endif
1680 .diag_destroy = udp_abort,
1681};
1682
1683static struct inet_protosw udpv6_protosw = {
1684 .type = SOCK_DGRAM,
1685 .protocol = IPPROTO_UDP,
1686 .prot = &udpv6_prot,
1687 .ops = &inet6_dgram_ops,
1688 .flags = INET_PROTOSW_PERMANENT,
1689};
1690
1691int __init udpv6_init(void)
1692{
1693 int ret;
1694
1695 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
1696 if (ret)
1697 goto out;
1698
1699 ret = inet6_register_protosw(&udpv6_protosw);
1700 if (ret)
1701 goto out_udpv6_protocol;
1702out:
1703 return ret;
1704
1705out_udpv6_protocol:
1706 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1707 goto out;
1708}
1709
1710void udpv6_exit(void)
1711{
1712 inet6_unregister_protosw(&udpv6_protosw);
1713 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1714}
1715
