3 * Linux INET6 implementation
6 * Pedro Roque <roque@di.fc.ul.pt>
8 * Based on linux/ipv4/udp.c
11 * Hideaki YOSHIFUJI : sin6_scope_id support
12 * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which
13 * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind
14 * a single port at the same time.
15 * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data
16 * YOSHIFUJI Hideaki @USAGI: convert /proc/net/udp6 to seq_file.
18 * This program is free software; you can redistribute it and/or
19 * modify it under the terms of the GNU General Public License
20 * as published by the Free Software Foundation; either version
21 * 2 of the License, or (at your option) any later version.
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>
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>
46 #include <net/tcp_states.h>
47 #include <net/ip6_checksum.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>
54 #include <linux/proc_fs.h>
55 #include <linux/seq_file.h>
56 #include <trace/events/skb.h>
59 static bool udp6_lib_exact_dif_match(struct net *net, struct sk_buff *skb)
61 #if defined(CONFIG_NET_L3_MASTER_DEV)
62 if (!net->ipv4.sysctl_udp_l3mdev_accept &&
63 skb && ipv6_l3mdev_skb(IP6CB(skb)->flags))
69 static u32 udp6_ehashfn(const struct net *net,
70 const struct in6_addr *laddr,
72 const struct in6_addr *faddr,
75 static u32 udp6_ehash_secret __read_mostly;
76 static u32 udp_ipv6_hash_secret __read_mostly;
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));
85 lhash = (__force u32)laddr->s6_addr32[3];
86 fhash = __ipv6_addr_jhash(faddr, udp_ipv6_hash_secret);
88 return __inet6_ehashfn(lhash, lport, fhash, fport,
89 udp_ipv6_hash_secret + net_hash_mix(net));
92 int udp_v6_get_port(struct sock *sk, unsigned short snum)
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);
99 /* precompute partial secondary hash */
100 udp_sk(sk)->udp_portaddr_hash = hash2_partial;
101 return udp_lib_get_port(sk, snum, hash2_nulladdr);
104 static void udp_v6_rehash(struct sock *sk)
106 u16 new_hash = ipv6_portaddr_hash(sock_net(sk),
107 &sk->sk_v6_rcv_saddr,
108 inet_sk(sk)->inet_num);
110 udp_lib_rehash(sk, new_hash);
113 static 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)
119 struct inet_sock *inet;
121 if (!net_eq(sock_net(sk), net) ||
122 udp_sk(sk)->udp_port_hash != hnum ||
123 sk->sk_family != PF_INET6)
129 if (inet->inet_dport) {
130 if (inet->inet_dport != sport)
135 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
136 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr))
141 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
142 if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr))
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);
153 if (sk->sk_bound_dev_if)
157 if (READ_ONCE(sk->sk_incoming_cpu) == raw_smp_processor_id())
163 /* called with rcu_read_lock() */
164 static 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)
170 struct sock *sk, *result, *reuseport_result;
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 reuseport_result = NULL;
182 if (sk->sk_reuseport &&
183 sk->sk_state != TCP_ESTABLISHED) {
184 hash = udp6_ehashfn(net, daddr, hnum,
187 reuseport_result = reuseport_select_sock(sk, hash, skb,
188 sizeof(struct udphdr));
189 if (reuseport_result && !reuseport_has_conns(sk, false))
190 return reuseport_result;
193 result = reuseport_result ? : sk;
200 /* rcu_read_lock() must be held */
201 struct sock *__udp6_lib_lookup(struct net *net,
202 const struct in6_addr *saddr, __be16 sport,
203 const struct in6_addr *daddr, __be16 dport,
204 int dif, int sdif, struct udp_table *udptable,
207 struct sock *sk, *result;
208 unsigned short hnum = ntohs(dport);
209 unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask);
210 struct udp_hslot *hslot2, *hslot = &udptable->hash[slot];
211 bool exact_dif = udp6_lib_exact_dif_match(net, skb);
215 if (hslot->count > 10) {
216 hash2 = ipv6_portaddr_hash(net, daddr, hnum);
217 slot2 = hash2 & udptable->mask;
218 hslot2 = &udptable->hash2[slot2];
219 if (hslot->count < hslot2->count)
222 result = udp6_lib_lookup2(net, saddr, sport,
223 daddr, hnum, dif, sdif, exact_dif,
226 unsigned int old_slot2 = slot2;
227 hash2 = ipv6_portaddr_hash(net, &in6addr_any, hnum);
228 slot2 = hash2 & udptable->mask;
229 /* avoid searching the same slot again. */
230 if (unlikely(slot2 == old_slot2))
233 hslot2 = &udptable->hash2[slot2];
234 if (hslot->count < hslot2->count)
237 result = udp6_lib_lookup2(net, saddr, sport,
238 daddr, hnum, dif, sdif,
242 if (unlikely(IS_ERR(result)))
249 sk_for_each_rcu(sk, &hslot->head) {
250 score = compute_score(sk, net, saddr, sport, daddr, hnum, dif,
252 if (score > badness) {
253 if (sk->sk_reuseport) {
254 hash = udp6_ehashfn(net, daddr, hnum,
256 result = reuseport_select_sock(sk, hash, skb,
257 sizeof(struct udphdr));
258 if (unlikely(IS_ERR(result)))
269 EXPORT_SYMBOL_GPL(__udp6_lib_lookup);
271 static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb,
272 __be16 sport, __be16 dport,
273 struct udp_table *udptable)
275 const struct ipv6hdr *iph = ipv6_hdr(skb);
277 return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport,
278 &iph->daddr, dport, inet6_iif(skb),
279 inet6_sdif(skb), udptable, skb);
282 struct sock *udp6_lib_lookup_skb(struct sk_buff *skb,
283 __be16 sport, __be16 dport)
285 const struct ipv6hdr *iph = ipv6_hdr(skb);
287 return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport,
288 &iph->daddr, dport, inet6_iif(skb),
289 inet6_sdif(skb), &udp_table, NULL);
291 EXPORT_SYMBOL_GPL(udp6_lib_lookup_skb);
293 /* Must be called under rcu_read_lock().
294 * Does increment socket refcount.
296 #if IS_ENABLED(CONFIG_NF_TPROXY_IPV6) || IS_ENABLED(CONFIG_NF_SOCKET_IPV6)
297 struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport,
298 const struct in6_addr *daddr, __be16 dport, int dif)
302 sk = __udp6_lib_lookup(net, saddr, sport, daddr, dport,
303 dif, 0, &udp_table, NULL);
304 if (sk && !refcount_inc_not_zero(&sk->sk_refcnt))
308 EXPORT_SYMBOL_GPL(udp6_lib_lookup);
311 /* do not use the scratch area len for jumbogram: their length execeeds the
312 * scratch area space; note that the IP6CB flags is still in the first
313 * cacheline, so checking for jumbograms is cheap
315 static int udp6_skb_len(struct sk_buff *skb)
317 return unlikely(inet6_is_jumbogram(skb)) ? skb->len : udp_skb_len(skb);
321 * This should be easy, if there is something there we
322 * return it, otherwise we block.
325 int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
326 int noblock, int flags, int *addr_len)
328 struct ipv6_pinfo *np = inet6_sk(sk);
329 struct inet_sock *inet = inet_sk(sk);
331 unsigned int ulen, copied;
332 int peeked, peeking, off;
334 int is_udplite = IS_UDPLITE(sk);
335 bool checksum_valid = false;
338 if (flags & MSG_ERRQUEUE)
339 return ipv6_recv_error(sk, msg, len, addr_len);
341 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
342 return ipv6_recv_rxpmtu(sk, msg, len, addr_len);
345 peeking = flags & MSG_PEEK;
346 off = sk_peek_offset(sk, flags);
347 skb = __skb_recv_udp(sk, flags, noblock, &peeked, &off, &err);
351 ulen = udp6_skb_len(skb);
353 if (copied > ulen - off)
355 else if (copied < ulen)
356 msg->msg_flags |= MSG_TRUNC;
358 is_udp4 = (skb->protocol == htons(ETH_P_IP));
361 * If checksum is needed at all, try to do it while copying the
362 * data. If the data is truncated, or if we only want a partial
363 * coverage checksum (UDP-Lite), do it before the copy.
366 if (copied < ulen || peeking ||
367 (is_udplite && UDP_SKB_CB(skb)->partial_cov)) {
368 checksum_valid = udp_skb_csum_unnecessary(skb) ||
369 !__udp_lib_checksum_complete(skb);
374 if (checksum_valid || udp_skb_csum_unnecessary(skb)) {
375 if (udp_skb_is_linear(skb))
376 err = copy_linear_skb(skb, copied, off, &msg->msg_iter);
378 err = skb_copy_datagram_msg(skb, off, msg, copied);
380 err = skb_copy_and_csum_datagram_msg(skb, off, msg);
386 atomic_inc(&sk->sk_drops);
388 UDP_INC_STATS(sock_net(sk), UDP_MIB_INERRORS,
391 UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS,
399 UDP_INC_STATS(sock_net(sk), UDP_MIB_INDATAGRAMS,
402 UDP6_INC_STATS(sock_net(sk), UDP_MIB_INDATAGRAMS,
406 sock_recv_ts_and_drops(msg, sk, skb);
408 /* Copy the address. */
410 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
411 sin6->sin6_family = AF_INET6;
412 sin6->sin6_port = udp_hdr(skb)->source;
413 sin6->sin6_flowinfo = 0;
416 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
418 sin6->sin6_scope_id = 0;
420 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
421 sin6->sin6_scope_id =
422 ipv6_iface_scope_id(&sin6->sin6_addr,
425 *addr_len = sizeof(*sin6);
427 if (cgroup_bpf_enabled)
428 BPF_CGROUP_RUN_PROG_UDP6_RECVMSG_LOCK(sk,
429 (struct sockaddr *)sin6);
433 ip6_datagram_recv_common_ctl(sk, msg, skb);
436 if (inet->cmsg_flags)
437 ip_cmsg_recv_offset(msg, sk, skb,
438 sizeof(struct udphdr), off);
441 ip6_datagram_recv_specific_ctl(sk, msg, skb);
445 if (flags & MSG_TRUNC)
448 skb_consume_udp(sk, skb, peeking ? -err : err);
452 if (!__sk_queue_drop_skb(sk, &udp_sk(sk)->reader_queue, skb, flags,
453 udp_skb_destructor)) {
455 UDP_INC_STATS(sock_net(sk),
456 UDP_MIB_CSUMERRORS, is_udplite);
457 UDP_INC_STATS(sock_net(sk),
458 UDP_MIB_INERRORS, is_udplite);
460 UDP6_INC_STATS(sock_net(sk),
461 UDP_MIB_CSUMERRORS, is_udplite);
462 UDP6_INC_STATS(sock_net(sk),
463 UDP_MIB_INERRORS, is_udplite);
468 /* starting over for a new packet, but check if we need to yield */
470 msg->msg_flags &= ~MSG_TRUNC;
474 void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
475 u8 type, u8 code, int offset, __be32 info,
476 struct udp_table *udptable)
478 struct ipv6_pinfo *np;
479 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
480 const struct in6_addr *saddr = &hdr->saddr;
481 const struct in6_addr *daddr = &hdr->daddr;
482 struct udphdr *uh = (struct udphdr *)(skb->data+offset);
486 struct net *net = dev_net(skb->dev);
488 sk = __udp6_lib_lookup(net, daddr, uh->dest, saddr, uh->source,
489 inet6_iif(skb), 0, udptable, NULL);
491 __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev),
496 harderr = icmpv6_err_convert(type, code, &err);
499 if (type == ICMPV6_PKT_TOOBIG) {
500 if (!ip6_sk_accept_pmtu(sk))
502 ip6_sk_update_pmtu(skb, sk, info);
503 if (np->pmtudisc != IPV6_PMTUDISC_DONT)
506 if (type == NDISC_REDIRECT) {
507 ip6_sk_redirect(skb, sk);
512 if (!harderr || sk->sk_state != TCP_ESTABLISHED)
515 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
519 sk->sk_error_report(sk);
524 static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
528 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
529 sock_rps_save_rxhash(sk, skb);
530 sk_mark_napi_id(sk, skb);
531 sk_incoming_cpu_update(sk);
533 sk_mark_napi_id_once(sk, skb);
536 rc = __udp_enqueue_schedule_skb(sk, skb);
538 int is_udplite = IS_UDPLITE(sk);
540 /* Note that an ENOMEM error is charged twice */
542 UDP6_INC_STATS(sock_net(sk),
543 UDP_MIB_RCVBUFERRORS, is_udplite);
544 UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
552 static __inline__ void udpv6_err(struct sk_buff *skb,
553 struct inet6_skb_parm *opt, u8 type,
554 u8 code, int offset, __be32 info)
556 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table);
559 static DEFINE_STATIC_KEY_FALSE(udpv6_encap_needed_key);
560 void udpv6_encap_enable(void)
562 static_branch_enable(&udpv6_encap_needed_key);
564 EXPORT_SYMBOL(udpv6_encap_enable);
566 static int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
568 struct udp_sock *up = udp_sk(sk);
569 int is_udplite = IS_UDPLITE(sk);
571 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
574 if (static_branch_unlikely(&udpv6_encap_needed_key) && up->encap_type) {
575 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
578 * This is an encapsulation socket so pass the skb to
579 * the socket's udp_encap_rcv() hook. Otherwise, just
580 * fall through and pass this up the UDP socket.
581 * up->encap_rcv() returns the following value:
582 * =0 if skb was successfully passed to the encap
583 * handler or was discarded by it.
584 * >0 if skb should be passed on to UDP.
585 * <0 if skb should be resubmitted as proto -N
588 /* if we're overly short, let UDP handle it */
589 encap_rcv = READ_ONCE(up->encap_rcv);
593 /* Verify checksum before giving to encap */
594 if (udp_lib_checksum_complete(skb))
597 ret = encap_rcv(sk, skb);
599 __UDP_INC_STATS(sock_net(sk),
606 /* FALLTHROUGH -- it's a UDP Packet */
610 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
612 if ((up->pcflag & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
614 if (up->pcrlen == 0) { /* full coverage was set */
615 net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n",
616 UDP_SKB_CB(skb)->cscov, skb->len);
619 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
620 net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n",
621 UDP_SKB_CB(skb)->cscov, up->pcrlen);
626 prefetch(&sk->sk_rmem_alloc);
627 if (rcu_access_pointer(sk->sk_filter) &&
628 udp_lib_checksum_complete(skb))
631 if (sk_filter_trim_cap(sk, skb, sizeof(struct udphdr)))
634 udp_csum_pull_header(skb);
638 return __udpv6_queue_rcv_skb(sk, skb);
641 __UDP6_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite);
643 __UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
644 atomic_inc(&sk->sk_drops);
649 static bool __udp_v6_is_mcast_sock(struct net *net, struct sock *sk,
650 __be16 loc_port, const struct in6_addr *loc_addr,
651 __be16 rmt_port, const struct in6_addr *rmt_addr,
652 int dif, unsigned short hnum)
654 struct inet_sock *inet = inet_sk(sk);
656 if (!net_eq(sock_net(sk), net))
659 if (udp_sk(sk)->udp_port_hash != hnum ||
660 sk->sk_family != PF_INET6 ||
661 (inet->inet_dport && inet->inet_dport != rmt_port) ||
662 (!ipv6_addr_any(&sk->sk_v6_daddr) &&
663 !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) ||
664 (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif) ||
665 (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) &&
666 !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr)))
668 if (!inet6_mc_check(sk, loc_addr, rmt_addr))
673 static void udp6_csum_zero_error(struct sk_buff *skb)
675 /* RFC 2460 section 8.1 says that we SHOULD log
676 * this error. Well, it is reasonable.
678 net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n",
679 &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source),
680 &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest));
684 * Note: called only from the BH handler context,
685 * so we don't need to lock the hashes.
687 static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
688 const struct in6_addr *saddr, const struct in6_addr *daddr,
689 struct udp_table *udptable, int proto)
691 struct sock *sk, *first = NULL;
692 const struct udphdr *uh = udp_hdr(skb);
693 unsigned short hnum = ntohs(uh->dest);
694 struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum);
695 unsigned int offset = offsetof(typeof(*sk), sk_node);
696 unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10);
697 int dif = inet6_iif(skb);
698 struct hlist_node *node;
699 struct sk_buff *nskb;
702 hash2_any = ipv6_portaddr_hash(net, &in6addr_any, hnum) &
704 hash2 = ipv6_portaddr_hash(net, daddr, hnum) & udptable->mask;
706 hslot = &udptable->hash2[hash2];
707 offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node);
710 sk_for_each_entry_offset_rcu(sk, node, &hslot->head, offset) {
711 if (!__udp_v6_is_mcast_sock(net, sk, uh->dest, daddr,
712 uh->source, saddr, dif, hnum))
714 /* If zero checksum and no_check is not on for
715 * the socket then skip it.
717 if (!uh->check && !udp_sk(sk)->no_check6_rx)
723 nskb = skb_clone(skb, GFP_ATOMIC);
724 if (unlikely(!nskb)) {
725 atomic_inc(&sk->sk_drops);
726 __UDP6_INC_STATS(net, UDP_MIB_RCVBUFERRORS,
728 __UDP6_INC_STATS(net, UDP_MIB_INERRORS,
733 if (udpv6_queue_rcv_skb(sk, nskb) > 0)
737 /* Also lookup *:port if we are using hash2 and haven't done so yet. */
738 if (use_hash2 && hash2 != hash2_any) {
744 if (udpv6_queue_rcv_skb(first, skb) > 0)
748 __UDP6_INC_STATS(net, UDP_MIB_IGNOREDMULTI,
749 proto == IPPROTO_UDPLITE);
754 static void udp6_sk_rx_dst_set(struct sock *sk, struct dst_entry *dst)
756 if (udp_sk_rx_dst_set(sk, dst)) {
757 const struct rt6_info *rt = (const struct rt6_info *)dst;
759 inet6_sk(sk)->rx_dst_cookie = rt6_get_cookie(rt);
763 /* wrapper for udp_queue_rcv_skb tacking care of csum conversion and
764 * return code conversion for ip layer consumption
766 static int udp6_unicast_rcv_skb(struct sock *sk, struct sk_buff *skb,
771 if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk))
772 skb_checksum_try_convert(skb, IPPROTO_UDP, uh->check,
775 ret = udpv6_queue_rcv_skb(sk, skb);
777 /* a return value > 0 means to resubmit the input */
783 int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
786 const struct in6_addr *saddr, *daddr;
787 struct net *net = dev_net(skb->dev);
792 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
795 saddr = &ipv6_hdr(skb)->saddr;
796 daddr = &ipv6_hdr(skb)->daddr;
799 ulen = ntohs(uh->len);
803 if (proto == IPPROTO_UDP) {
804 /* UDP validates ulen. */
806 /* Check for jumbo payload */
810 if (ulen < sizeof(*uh))
813 if (ulen < skb->len) {
814 if (pskb_trim_rcsum(skb, ulen))
816 saddr = &ipv6_hdr(skb)->saddr;
817 daddr = &ipv6_hdr(skb)->daddr;
822 if (udp6_csum_init(skb, uh, proto))
825 /* Check if the socket is already available, e.g. due to early demux */
826 sk = skb_steal_sock(skb);
828 struct dst_entry *dst = skb_dst(skb);
831 if (unlikely(sk->sk_rx_dst != dst))
832 udp6_sk_rx_dst_set(sk, dst);
834 if (!uh->check && !udp_sk(sk)->no_check6_rx) {
836 goto report_csum_error;
839 ret = udp6_unicast_rcv_skb(sk, skb, uh);
845 * Multicast receive code
847 if (ipv6_addr_is_multicast(daddr))
848 return __udp6_lib_mcast_deliver(net, skb,
849 saddr, daddr, udptable, proto);
852 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
854 if (!uh->check && !udp_sk(sk)->no_check6_rx)
855 goto report_csum_error;
856 return udp6_unicast_rcv_skb(sk, skb, uh);
860 goto report_csum_error;
862 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
865 if (udp_lib_checksum_complete(skb))
868 __UDP6_INC_STATS(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
869 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
875 net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n",
876 proto == IPPROTO_UDPLITE ? "-Lite" : "",
877 saddr, ntohs(uh->source),
879 daddr, ntohs(uh->dest));
883 udp6_csum_zero_error(skb);
885 __UDP6_INC_STATS(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE);
887 __UDP6_INC_STATS(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
893 static struct sock *__udp6_lib_demux_lookup(struct net *net,
894 __be16 loc_port, const struct in6_addr *loc_addr,
895 __be16 rmt_port, const struct in6_addr *rmt_addr,
898 unsigned short hnum = ntohs(loc_port);
899 unsigned int hash2 = ipv6_portaddr_hash(net, loc_addr, hnum);
900 unsigned int slot2 = hash2 & udp_table.mask;
901 struct udp_hslot *hslot2 = &udp_table.hash2[slot2];
902 const __portpair ports = INET_COMBINED_PORTS(rmt_port, hnum);
905 udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) {
906 if (sk->sk_state == TCP_ESTABLISHED &&
907 INET6_MATCH(sk, net, rmt_addr, loc_addr, ports, dif, sdif))
909 /* Only check first socket in chain */
915 static void udp_v6_early_demux(struct sk_buff *skb)
917 struct net *net = dev_net(skb->dev);
918 const struct udphdr *uh;
920 struct dst_entry *dst;
921 int dif = skb->dev->ifindex;
922 int sdif = inet6_sdif(skb);
924 if (!pskb_may_pull(skb, skb_transport_offset(skb) +
925 sizeof(struct udphdr)))
930 if (skb->pkt_type == PACKET_HOST)
931 sk = __udp6_lib_demux_lookup(net, uh->dest,
932 &ipv6_hdr(skb)->daddr,
933 uh->source, &ipv6_hdr(skb)->saddr,
938 if (!sk || !refcount_inc_not_zero(&sk->sk_refcnt))
942 skb->destructor = sock_efree;
943 dst = READ_ONCE(sk->sk_rx_dst);
946 dst = dst_check(dst, inet6_sk(sk)->rx_dst_cookie);
948 /* set noref for now.
949 * any place which wants to hold dst has to call
952 skb_dst_set_noref(skb, dst);
956 static __inline__ int udpv6_rcv(struct sk_buff *skb)
958 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP);
962 * Throw away all pending data and cancel the corking. Socket is locked.
964 static void udp_v6_flush_pending_frames(struct sock *sk)
966 struct udp_sock *up = udp_sk(sk);
968 if (up->pending == AF_INET)
969 udp_flush_pending_frames(sk);
970 else if (up->pending) {
973 ip6_flush_pending_frames(sk);
977 static int udpv6_pre_connect(struct sock *sk, struct sockaddr *uaddr,
980 /* The following checks are replicated from __ip6_datagram_connect()
981 * and intended to prevent BPF program called below from accessing
982 * bytes that are out of the bound specified by user in addr_len.
984 if (uaddr->sa_family == AF_INET) {
985 if (__ipv6_only_sock(sk))
986 return -EAFNOSUPPORT;
987 return udp_pre_connect(sk, uaddr, addr_len);
990 if (addr_len < SIN6_LEN_RFC2133)
993 return BPF_CGROUP_RUN_PROG_INET6_CONNECT_LOCK(sk, uaddr);
997 * udp6_hwcsum_outgoing - handle outgoing HW checksumming
998 * @sk: socket we are sending on
999 * @skb: sk_buff containing the filled-in UDP header
1000 * (checksum field must be zeroed out)
1002 static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
1003 const struct in6_addr *saddr,
1004 const struct in6_addr *daddr, int len)
1006 unsigned int offset;
1007 struct udphdr *uh = udp_hdr(skb);
1008 struct sk_buff *frags = skb_shinfo(skb)->frag_list;
1012 /* Only one fragment on the socket. */
1013 skb->csum_start = skb_transport_header(skb) - skb->head;
1014 skb->csum_offset = offsetof(struct udphdr, check);
1015 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0);
1018 * HW-checksum won't work as there are two or more
1019 * fragments on the socket so that all csums of sk_buffs
1020 * should be together
1022 offset = skb_transport_offset(skb);
1023 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
1026 skb->ip_summed = CHECKSUM_NONE;
1029 csum = csum_add(csum, frags->csum);
1030 } while ((frags = frags->next));
1032 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP,
1035 uh->check = CSUM_MANGLED_0;
1043 static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6,
1044 struct inet_cork *cork)
1046 struct sock *sk = skb->sk;
1049 int is_udplite = IS_UDPLITE(sk);
1051 int offset = skb_transport_offset(skb);
1052 int len = skb->len - offset;
1053 int datalen = len - sizeof(*uh);
1056 * Create a UDP header
1059 uh->source = fl6->fl6_sport;
1060 uh->dest = fl6->fl6_dport;
1061 uh->len = htons(len);
1064 if (cork->gso_size) {
1065 const int hlen = skb_network_header_len(skb) +
1066 sizeof(struct udphdr);
1068 if (hlen + cork->gso_size > cork->fragsize) {
1072 if (skb->len > cork->gso_size * UDP_MAX_SEGMENTS) {
1076 if (udp_sk(sk)->no_check6_tx) {
1080 if (skb->ip_summed != CHECKSUM_PARTIAL || is_udplite ||
1081 dst_xfrm(skb_dst(skb))) {
1086 if (datalen > cork->gso_size) {
1087 skb_shinfo(skb)->gso_size = cork->gso_size;
1088 skb_shinfo(skb)->gso_type = SKB_GSO_UDP_L4;
1089 skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(datalen,
1096 csum = udplite_csum(skb);
1097 else if (udp_sk(sk)->no_check6_tx) { /* UDP csum disabled */
1098 skb->ip_summed = CHECKSUM_NONE;
1100 } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
1102 udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, len);
1105 csum = udp_csum(skb);
1107 /* add protocol-dependent pseudo-header */
1108 uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
1109 len, fl6->flowi6_proto, csum);
1111 uh->check = CSUM_MANGLED_0;
1114 err = ip6_send_skb(skb);
1116 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) {
1117 UDP6_INC_STATS(sock_net(sk),
1118 UDP_MIB_SNDBUFERRORS, is_udplite);
1122 UDP6_INC_STATS(sock_net(sk),
1123 UDP_MIB_OUTDATAGRAMS, is_udplite);
1128 static int udp_v6_push_pending_frames(struct sock *sk)
1130 struct sk_buff *skb;
1131 struct udp_sock *up = udp_sk(sk);
1135 if (up->pending == AF_INET)
1136 return udp_push_pending_frames(sk);
1138 /* ip6_finish_skb will release the cork, so make a copy of
1141 fl6 = inet_sk(sk)->cork.fl.u.ip6;
1143 skb = ip6_finish_skb(sk);
1147 err = udp_v6_send_skb(skb, &fl6, &inet_sk(sk)->cork.base);
1155 int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
1157 struct ipv6_txoptions opt_space;
1158 struct udp_sock *up = udp_sk(sk);
1159 struct inet_sock *inet = inet_sk(sk);
1160 struct ipv6_pinfo *np = inet6_sk(sk);
1161 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
1162 struct in6_addr *daddr, *final_p, final;
1163 struct ipv6_txoptions *opt = NULL;
1164 struct ipv6_txoptions *opt_to_free = NULL;
1165 struct ip6_flowlabel *flowlabel = NULL;
1167 struct dst_entry *dst;
1168 struct ipcm6_cookie ipc6;
1169 int addr_len = msg->msg_namelen;
1170 bool connected = false;
1172 int corkreq = READ_ONCE(up->corkflag) || msg->msg_flags&MSG_MORE;
1174 int is_udplite = IS_UDPLITE(sk);
1175 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
1178 ipc6.gso_size = READ_ONCE(up->gso_size);
1179 ipc6.sockc.tsflags = sk->sk_tsflags;
1181 /* destination address check */
1183 if (addr_len < offsetof(struct sockaddr, sa_data))
1186 switch (sin6->sin6_family) {
1188 if (addr_len < SIN6_LEN_RFC2133)
1190 daddr = &sin6->sin6_addr;
1191 if (ipv6_addr_any(daddr) &&
1192 ipv6_addr_v4mapped(&np->saddr))
1193 ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK),
1197 goto do_udp_sendmsg;
1199 msg->msg_name = sin6 = NULL;
1200 msg->msg_namelen = addr_len = 0;
1206 } else if (!up->pending) {
1207 if (sk->sk_state != TCP_ESTABLISHED)
1208 return -EDESTADDRREQ;
1209 daddr = &sk->sk_v6_daddr;
1214 if (ipv6_addr_v4mapped(daddr)) {
1215 struct sockaddr_in sin;
1216 sin.sin_family = AF_INET;
1217 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport;
1218 sin.sin_addr.s_addr = daddr->s6_addr32[3];
1219 msg->msg_name = &sin;
1220 msg->msg_namelen = sizeof(sin);
1222 if (__ipv6_only_sock(sk))
1223 return -ENETUNREACH;
1224 return udp_sendmsg(sk, msg, len);
1228 if (up->pending == AF_INET)
1229 return udp_sendmsg(sk, msg, len);
1231 /* Rough check on arithmetic overflow,
1232 better check is made in ip6_append_data().
1234 if (len > INT_MAX - sizeof(struct udphdr))
1237 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
1240 * There are pending frames.
1241 * The socket lock must be held while it's corked.
1244 if (likely(up->pending)) {
1245 if (unlikely(up->pending != AF_INET6)) {
1247 return -EAFNOSUPPORT;
1250 goto do_append_data;
1254 ulen += sizeof(struct udphdr);
1256 memset(&fl6, 0, sizeof(fl6));
1259 if (sin6->sin6_port == 0)
1262 fl6.fl6_dport = sin6->sin6_port;
1263 daddr = &sin6->sin6_addr;
1266 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
1267 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
1268 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1275 * Otherwise it will be difficult to maintain
1278 if (sk->sk_state == TCP_ESTABLISHED &&
1279 ipv6_addr_equal(daddr, &sk->sk_v6_daddr))
1280 daddr = &sk->sk_v6_daddr;
1282 if (addr_len >= sizeof(struct sockaddr_in6) &&
1283 sin6->sin6_scope_id &&
1284 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
1285 fl6.flowi6_oif = sin6->sin6_scope_id;
1287 if (sk->sk_state != TCP_ESTABLISHED)
1288 return -EDESTADDRREQ;
1290 fl6.fl6_dport = inet->inet_dport;
1291 daddr = &sk->sk_v6_daddr;
1292 fl6.flowlabel = np->flow_label;
1296 if (!fl6.flowi6_oif)
1297 fl6.flowi6_oif = sk->sk_bound_dev_if;
1299 if (!fl6.flowi6_oif)
1300 fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex;
1302 fl6.flowi6_mark = sk->sk_mark;
1303 fl6.flowi6_uid = sk->sk_uid;
1305 if (msg->msg_controllen) {
1307 memset(opt, 0, sizeof(struct ipv6_txoptions));
1308 opt->tot_len = sizeof(*opt);
1311 err = udp_cmsg_send(sk, msg, &ipc6.gso_size);
1313 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6,
1316 fl6_sock_release(flowlabel);
1319 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
1320 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1324 if (!(opt->opt_nflen|opt->opt_flen))
1329 opt = txopt_get(np);
1333 opt = fl6_merge_options(&opt_space, flowlabel, opt);
1334 opt = ipv6_fixup_options(&opt_space, opt);
1337 fl6.flowi6_proto = sk->sk_protocol;
1339 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
1340 fl6.saddr = np->saddr;
1341 fl6.fl6_sport = inet->inet_sport;
1343 if (cgroup_bpf_enabled && !connected) {
1344 err = BPF_CGROUP_RUN_PROG_UDP6_SENDMSG_LOCK(sk,
1345 (struct sockaddr *)sin6, &fl6.saddr);
1349 if (ipv6_addr_v4mapped(&sin6->sin6_addr)) {
1350 /* BPF program rewrote IPv6-only by IPv4-mapped
1351 * IPv6. It's currently unsupported.
1356 if (sin6->sin6_port == 0) {
1357 /* BPF program set invalid port. Reject it. */
1361 fl6.fl6_dport = sin6->sin6_port;
1362 fl6.daddr = sin6->sin6_addr;
1366 if (ipv6_addr_any(&fl6.daddr))
1367 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
1369 final_p = fl6_update_dst(&fl6, opt, &final);
1373 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) {
1374 fl6.flowi6_oif = np->mcast_oif;
1376 } else if (!fl6.flowi6_oif)
1377 fl6.flowi6_oif = np->ucast_oif;
1379 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
1381 if (ipc6.tclass < 0)
1382 ipc6.tclass = np->tclass;
1384 fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel);
1386 dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p, connected);
1393 if (ipc6.hlimit < 0)
1394 ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
1396 if (msg->msg_flags&MSG_CONFIRM)
1400 /* Lockless fast path for the non-corking case */
1402 struct inet_cork_full cork;
1403 struct sk_buff *skb;
1405 skb = ip6_make_skb(sk, getfrag, msg, ulen,
1406 sizeof(struct udphdr), &ipc6,
1407 &fl6, (struct rt6_info *)dst,
1408 msg->msg_flags, &cork);
1410 if (!IS_ERR_OR_NULL(skb))
1411 err = udp_v6_send_skb(skb, &fl6, &cork.base);
1416 if (unlikely(up->pending)) {
1417 /* The socket is already corked while preparing it. */
1418 /* ... which is an evident application bug. --ANK */
1421 net_dbg_ratelimited("udp cork app bug 2\n");
1426 up->pending = AF_INET6;
1429 if (ipc6.dontfrag < 0)
1430 ipc6.dontfrag = np->dontfrag;
1432 err = ip6_append_data(sk, getfrag, msg, ulen, sizeof(struct udphdr),
1433 &ipc6, &fl6, (struct rt6_info *)dst,
1434 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
1436 udp_v6_flush_pending_frames(sk);
1438 err = udp_v6_push_pending_frames(sk);
1439 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
1443 err = np->recverr ? net_xmit_errno(err) : 0;
1449 fl6_sock_release(flowlabel);
1450 txopt_put(opt_to_free);
1454 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
1455 * ENOBUFS might not be good (it's not tunable per se), but otherwise
1456 * we don't have a good statistic (IpOutDiscards but it can be too many
1457 * things). We could add another new stat but at least for now that
1458 * seems like overkill.
1460 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
1461 UDP6_INC_STATS(sock_net(sk),
1462 UDP_MIB_SNDBUFERRORS, is_udplite);
1467 if (msg->msg_flags & MSG_PROBE)
1468 dst_confirm_neigh(dst, &fl6.daddr);
1469 if (!(msg->msg_flags&MSG_PROBE) || len)
1470 goto back_from_confirm;
1475 void udpv6_destroy_sock(struct sock *sk)
1477 struct udp_sock *up = udp_sk(sk);
1480 /* protects from races with udp_abort() */
1481 sock_set_flag(sk, SOCK_DEAD);
1482 udp_v6_flush_pending_frames(sk);
1485 if (static_branch_unlikely(&udpv6_encap_needed_key) && up->encap_type) {
1486 void (*encap_destroy)(struct sock *sk);
1487 encap_destroy = READ_ONCE(up->encap_destroy);
1492 inet6_destroy_sock(sk);
1496 * Socket option code for UDP
1498 int udpv6_setsockopt(struct sock *sk, int level, int optname,
1499 char __user *optval, unsigned int optlen)
1501 if (level == SOL_UDP || level == SOL_UDPLITE)
1502 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1503 udp_v6_push_pending_frames);
1504 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1507 #ifdef CONFIG_COMPAT
1508 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
1509 char __user *optval, unsigned int optlen)
1511 if (level == SOL_UDP || level == SOL_UDPLITE)
1512 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1513 udp_v6_push_pending_frames);
1514 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
1518 int udpv6_getsockopt(struct sock *sk, int level, int optname,
1519 char __user *optval, int __user *optlen)
1521 if (level == SOL_UDP || level == SOL_UDPLITE)
1522 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1523 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1526 #ifdef CONFIG_COMPAT
1527 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
1528 char __user *optval, int __user *optlen)
1530 if (level == SOL_UDP || level == SOL_UDPLITE)
1531 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1532 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
1536 /* thinking of making this const? Don't.
1537 * early_demux can change based on sysctl.
1539 static struct inet6_protocol udpv6_protocol = {
1540 .early_demux = udp_v6_early_demux,
1541 .early_demux_handler = udp_v6_early_demux,
1542 .handler = udpv6_rcv,
1543 .err_handler = udpv6_err,
1544 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1547 /* ------------------------------------------------------------------------ */
1548 #ifdef CONFIG_PROC_FS
1549 int udp6_seq_show(struct seq_file *seq, void *v)
1551 if (v == SEQ_START_TOKEN) {
1552 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
1554 int bucket = ((struct udp_iter_state *)seq->private)->bucket;
1555 struct inet_sock *inet = inet_sk(v);
1556 __u16 srcp = ntohs(inet->inet_sport);
1557 __u16 destp = ntohs(inet->inet_dport);
1558 __ip6_dgram_sock_seq_show(seq, v, srcp, destp,
1559 udp_rqueue_get(v), bucket);
1564 const struct seq_operations udp6_seq_ops = {
1565 .start = udp_seq_start,
1566 .next = udp_seq_next,
1567 .stop = udp_seq_stop,
1568 .show = udp6_seq_show,
1570 EXPORT_SYMBOL(udp6_seq_ops);
1572 static struct udp_seq_afinfo udp6_seq_afinfo = {
1574 .udp_table = &udp_table,
1577 int __net_init udp6_proc_init(struct net *net)
1579 if (!proc_create_net_data("udp6", 0444, net->proc_net, &udp6_seq_ops,
1580 sizeof(struct udp_iter_state), &udp6_seq_afinfo))
1585 void udp6_proc_exit(struct net *net)
1587 remove_proc_entry("udp6", net->proc_net);
1589 #endif /* CONFIG_PROC_FS */
1591 /* ------------------------------------------------------------------------ */
1593 struct proto udpv6_prot = {
1595 .owner = THIS_MODULE,
1596 .close = udp_lib_close,
1597 .pre_connect = udpv6_pre_connect,
1598 .connect = ip6_datagram_connect,
1599 .disconnect = udp_disconnect,
1601 .init = udp_init_sock,
1602 .destroy = udpv6_destroy_sock,
1603 .setsockopt = udpv6_setsockopt,
1604 .getsockopt = udpv6_getsockopt,
1605 .sendmsg = udpv6_sendmsg,
1606 .recvmsg = udpv6_recvmsg,
1607 .release_cb = ip6_datagram_release_cb,
1608 .hash = udp_lib_hash,
1609 .unhash = udp_lib_unhash,
1610 .rehash = udp_v6_rehash,
1611 .get_port = udp_v6_get_port,
1612 .memory_allocated = &udp_memory_allocated,
1613 .sysctl_mem = sysctl_udp_mem,
1614 .sysctl_wmem_offset = offsetof(struct net, ipv4.sysctl_udp_wmem_min),
1615 .sysctl_rmem_offset = offsetof(struct net, ipv4.sysctl_udp_rmem_min),
1616 .obj_size = sizeof(struct udp6_sock),
1617 .h.udp_table = &udp_table,
1618 #ifdef CONFIG_COMPAT
1619 .compat_setsockopt = compat_udpv6_setsockopt,
1620 .compat_getsockopt = compat_udpv6_getsockopt,
1622 .diag_destroy = udp_abort,
1625 static struct inet_protosw udpv6_protosw = {
1627 .protocol = IPPROTO_UDP,
1628 .prot = &udpv6_prot,
1629 .ops = &inet6_dgram_ops,
1630 .flags = INET_PROTOSW_PERMANENT,
1633 int __init udpv6_init(void)
1637 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
1641 ret = inet6_register_protosw(&udpv6_protosw);
1643 goto out_udpv6_protocol;
1648 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1652 void udpv6_exit(void)
1654 inet6_unregister_protosw(&udpv6_protosw);
1655 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);