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;
122 if (!net_eq(sock_net(sk), net) ||
123 udp_sk(sk)->udp_port_hash != hnum ||
124 sk->sk_family != PF_INET6)
130 if (inet->inet_dport) {
131 if (inet->inet_dport != sport)
136 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
137 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr))
142 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
143 if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr))
148 dev_match = udp_sk_bound_dev_eq(net, sk->sk_bound_dev_if, dif, sdif);
153 if (sk->sk_incoming_cpu == raw_smp_processor_id())
159 /* called with rcu_read_lock() */
160 static struct sock *udp6_lib_lookup2(struct net *net,
161 const struct in6_addr *saddr, __be16 sport,
162 const struct in6_addr *daddr, unsigned int hnum,
163 int dif, int sdif, bool exact_dif,
164 struct udp_hslot *hslot2, struct sk_buff *skb)
166 struct sock *sk, *result;
172 udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) {
173 score = compute_score(sk, net, saddr, sport,
174 daddr, hnum, dif, sdif, exact_dif);
175 if (score > badness) {
176 if (sk->sk_reuseport) {
177 hash = udp6_ehashfn(net, daddr, hnum,
180 result = reuseport_select_sock(sk, hash, skb,
181 sizeof(struct udphdr));
192 /* rcu_read_lock() must be held */
193 struct sock *__udp6_lib_lookup(struct net *net,
194 const struct in6_addr *saddr, __be16 sport,
195 const struct in6_addr *daddr, __be16 dport,
196 int dif, int sdif, struct udp_table *udptable,
199 struct sock *sk, *result;
200 unsigned short hnum = ntohs(dport);
201 unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask);
202 struct udp_hslot *hslot2, *hslot = &udptable->hash[slot];
203 bool exact_dif = udp6_lib_exact_dif_match(net, skb);
207 if (hslot->count > 10) {
208 hash2 = ipv6_portaddr_hash(net, daddr, hnum);
209 slot2 = hash2 & udptable->mask;
210 hslot2 = &udptable->hash2[slot2];
211 if (hslot->count < hslot2->count)
214 result = udp6_lib_lookup2(net, saddr, sport,
215 daddr, hnum, dif, sdif, exact_dif,
218 unsigned int old_slot2 = slot2;
219 hash2 = ipv6_portaddr_hash(net, &in6addr_any, hnum);
220 slot2 = hash2 & udptable->mask;
221 /* avoid searching the same slot again. */
222 if (unlikely(slot2 == old_slot2))
225 hslot2 = &udptable->hash2[slot2];
226 if (hslot->count < hslot2->count)
229 result = udp6_lib_lookup2(net, saddr, sport,
230 daddr, hnum, dif, sdif,
234 if (unlikely(IS_ERR(result)))
241 sk_for_each_rcu(sk, &hslot->head) {
242 score = compute_score(sk, net, saddr, sport, daddr, hnum, dif,
244 if (score > badness) {
245 if (sk->sk_reuseport) {
246 hash = udp6_ehashfn(net, daddr, hnum,
248 result = reuseport_select_sock(sk, hash, skb,
249 sizeof(struct udphdr));
250 if (unlikely(IS_ERR(result)))
261 EXPORT_SYMBOL_GPL(__udp6_lib_lookup);
263 static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb,
264 __be16 sport, __be16 dport,
265 struct udp_table *udptable)
267 const struct ipv6hdr *iph = ipv6_hdr(skb);
269 return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport,
270 &iph->daddr, dport, inet6_iif(skb),
271 inet6_sdif(skb), udptable, skb);
274 struct sock *udp6_lib_lookup_skb(struct sk_buff *skb,
275 __be16 sport, __be16 dport)
277 const struct ipv6hdr *iph = ipv6_hdr(skb);
279 return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport,
280 &iph->daddr, dport, inet6_iif(skb),
281 inet6_sdif(skb), &udp_table, skb);
283 EXPORT_SYMBOL_GPL(udp6_lib_lookup_skb);
285 /* Must be called under rcu_read_lock().
286 * Does increment socket refcount.
288 #if IS_ENABLED(CONFIG_NF_TPROXY_IPV6) || IS_ENABLED(CONFIG_NF_SOCKET_IPV6)
289 struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport,
290 const struct in6_addr *daddr, __be16 dport, int dif)
294 sk = __udp6_lib_lookup(net, saddr, sport, daddr, dport,
295 dif, 0, &udp_table, NULL);
296 if (sk && !refcount_inc_not_zero(&sk->sk_refcnt))
300 EXPORT_SYMBOL_GPL(udp6_lib_lookup);
303 /* do not use the scratch area len for jumbogram: their length execeeds the
304 * scratch area space; note that the IP6CB flags is still in the first
305 * cacheline, so checking for jumbograms is cheap
307 static int udp6_skb_len(struct sk_buff *skb)
309 return unlikely(inet6_is_jumbogram(skb)) ? skb->len : udp_skb_len(skb);
313 * This should be easy, if there is something there we
314 * return it, otherwise we block.
317 int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
318 int noblock, int flags, int *addr_len)
320 struct ipv6_pinfo *np = inet6_sk(sk);
321 struct inet_sock *inet = inet_sk(sk);
323 unsigned int ulen, copied;
324 int peeked, peeking, off;
326 int is_udplite = IS_UDPLITE(sk);
327 bool checksum_valid = false;
330 if (flags & MSG_ERRQUEUE)
331 return ipv6_recv_error(sk, msg, len, addr_len);
333 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
334 return ipv6_recv_rxpmtu(sk, msg, len, addr_len);
337 peeking = flags & MSG_PEEK;
338 off = sk_peek_offset(sk, flags);
339 skb = __skb_recv_udp(sk, flags, noblock, &peeked, &off, &err);
343 ulen = udp6_skb_len(skb);
345 if (copied > ulen - off)
347 else if (copied < ulen)
348 msg->msg_flags |= MSG_TRUNC;
350 is_udp4 = (skb->protocol == htons(ETH_P_IP));
353 * If checksum is needed at all, try to do it while copying the
354 * data. If the data is truncated, or if we only want a partial
355 * coverage checksum (UDP-Lite), do it before the copy.
358 if (copied < ulen || peeking ||
359 (is_udplite && UDP_SKB_CB(skb)->partial_cov)) {
360 checksum_valid = udp_skb_csum_unnecessary(skb) ||
361 !__udp_lib_checksum_complete(skb);
366 if (checksum_valid || udp_skb_csum_unnecessary(skb)) {
367 if (udp_skb_is_linear(skb))
368 err = copy_linear_skb(skb, copied, off, &msg->msg_iter);
370 err = skb_copy_datagram_msg(skb, off, msg, copied);
372 err = skb_copy_and_csum_datagram_msg(skb, off, msg);
378 atomic_inc(&sk->sk_drops);
380 UDP_INC_STATS(sock_net(sk), UDP_MIB_INERRORS,
383 UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS,
391 UDP_INC_STATS(sock_net(sk), UDP_MIB_INDATAGRAMS,
394 UDP6_INC_STATS(sock_net(sk), UDP_MIB_INDATAGRAMS,
398 sock_recv_ts_and_drops(msg, sk, skb);
400 /* Copy the address. */
402 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
403 sin6->sin6_family = AF_INET6;
404 sin6->sin6_port = udp_hdr(skb)->source;
405 sin6->sin6_flowinfo = 0;
408 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
410 sin6->sin6_scope_id = 0;
412 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
413 sin6->sin6_scope_id =
414 ipv6_iface_scope_id(&sin6->sin6_addr,
417 *addr_len = sizeof(*sin6);
420 if (udp_sk(sk)->gro_enabled)
421 udp_cmsg_recv(msg, sk, skb);
424 ip6_datagram_recv_common_ctl(sk, msg, skb);
427 if (inet->cmsg_flags)
428 ip_cmsg_recv_offset(msg, sk, skb,
429 sizeof(struct udphdr), off);
432 ip6_datagram_recv_specific_ctl(sk, msg, skb);
436 if (flags & MSG_TRUNC)
439 skb_consume_udp(sk, skb, peeking ? -err : err);
443 if (!__sk_queue_drop_skb(sk, &udp_sk(sk)->reader_queue, skb, flags,
444 udp_skb_destructor)) {
446 UDP_INC_STATS(sock_net(sk),
447 UDP_MIB_CSUMERRORS, is_udplite);
448 UDP_INC_STATS(sock_net(sk),
449 UDP_MIB_INERRORS, is_udplite);
451 UDP6_INC_STATS(sock_net(sk),
452 UDP_MIB_CSUMERRORS, is_udplite);
453 UDP6_INC_STATS(sock_net(sk),
454 UDP_MIB_INERRORS, is_udplite);
459 /* starting over for a new packet, but check if we need to yield */
461 msg->msg_flags &= ~MSG_TRUNC;
465 DEFINE_STATIC_KEY_FALSE(udpv6_encap_needed_key);
466 void udpv6_encap_enable(void)
468 static_branch_enable(&udpv6_encap_needed_key);
470 EXPORT_SYMBOL(udpv6_encap_enable);
472 /* Try to match ICMP errors to UDP tunnels by looking up a socket without
473 * reversing source and destination port: this will match tunnels that force the
474 * same destination port on both endpoints (e.g. VXLAN, GENEVE). Note that
475 * lwtunnels might actually break this assumption by being configured with
476 * different destination ports on endpoints, in this case we won't be able to
477 * trace ICMP messages back to them.
479 * Then ask the tunnel implementation to match the error against a valid
482 * Return the socket if we have a match.
484 static struct sock *__udp6_lib_err_encap(struct net *net,
485 const struct ipv6hdr *hdr, int offset,
487 struct udp_table *udptable,
490 int (*lookup)(struct sock *sk, struct sk_buff *skb);
491 int network_offset, transport_offset;
495 sk = __udp6_lib_lookup(net, &hdr->daddr, uh->source,
496 &hdr->saddr, uh->dest,
497 inet6_iif(skb), 0, udptable, skb);
501 network_offset = skb_network_offset(skb);
502 transport_offset = skb_transport_offset(skb);
504 /* Network header needs to point to the outer IPv6 header inside ICMP */
505 skb_reset_network_header(skb);
507 /* Transport header needs to point to the UDP header */
508 skb_set_transport_header(skb, offset);
511 lookup = READ_ONCE(up->encap_err_lookup);
512 if (!lookup || lookup(sk, skb))
515 skb_set_transport_header(skb, transport_offset);
516 skb_set_network_header(skb, network_offset);
520 void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
521 u8 type, u8 code, int offset, __be32 info,
522 struct udp_table *udptable)
524 struct ipv6_pinfo *np;
525 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
526 const struct in6_addr *saddr = &hdr->saddr;
527 const struct in6_addr *daddr = &hdr->daddr;
528 struct udphdr *uh = (struct udphdr *)(skb->data+offset);
533 struct net *net = dev_net(skb->dev);
535 sk = __udp6_lib_lookup(net, daddr, uh->dest, saddr, uh->source,
536 inet6_iif(skb), inet6_sdif(skb), udptable, skb);
538 /* No socket for error: try tunnels before discarding */
539 if (static_branch_unlikely(&udpv6_encap_needed_key)) {
540 sk = __udp6_lib_err_encap(net, hdr, offset, uh,
545 __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev),
552 harderr = icmpv6_err_convert(type, code, &err);
555 if (type == ICMPV6_PKT_TOOBIG) {
556 if (!ip6_sk_accept_pmtu(sk))
558 ip6_sk_update_pmtu(skb, sk, info);
559 if (np->pmtudisc != IPV6_PMTUDISC_DONT)
562 if (type == NDISC_REDIRECT) {
564 ip6_redirect(skb, sock_net(sk), inet6_iif(skb),
565 sk->sk_mark, sk->sk_uid);
567 ip6_sk_redirect(skb, sk);
572 /* Tunnels don't have an application socket: don't pass errors back */
577 if (!harderr || sk->sk_state != TCP_ESTABLISHED)
580 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
584 sk->sk_error_report(sk);
589 static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
593 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
594 sock_rps_save_rxhash(sk, skb);
595 sk_mark_napi_id(sk, skb);
596 sk_incoming_cpu_update(sk);
598 sk_mark_napi_id_once(sk, skb);
601 rc = __udp_enqueue_schedule_skb(sk, skb);
603 int is_udplite = IS_UDPLITE(sk);
605 /* Note that an ENOMEM error is charged twice */
607 UDP6_INC_STATS(sock_net(sk),
608 UDP_MIB_RCVBUFERRORS, is_udplite);
609 UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
617 static __inline__ void udpv6_err(struct sk_buff *skb,
618 struct inet6_skb_parm *opt, u8 type,
619 u8 code, int offset, __be32 info)
621 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table);
624 static int udpv6_queue_rcv_one_skb(struct sock *sk, struct sk_buff *skb)
626 struct udp_sock *up = udp_sk(sk);
627 int is_udplite = IS_UDPLITE(sk);
629 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
632 if (static_branch_unlikely(&udpv6_encap_needed_key) && up->encap_type) {
633 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
636 * This is an encapsulation socket so pass the skb to
637 * the socket's udp_encap_rcv() hook. Otherwise, just
638 * fall through and pass this up the UDP socket.
639 * up->encap_rcv() returns the following value:
640 * =0 if skb was successfully passed to the encap
641 * handler or was discarded by it.
642 * >0 if skb should be passed on to UDP.
643 * <0 if skb should be resubmitted as proto -N
646 /* if we're overly short, let UDP handle it */
647 encap_rcv = READ_ONCE(up->encap_rcv);
651 /* Verify checksum before giving to encap */
652 if (udp_lib_checksum_complete(skb))
655 ret = encap_rcv(sk, skb);
657 __UDP_INC_STATS(sock_net(sk),
664 /* FALLTHROUGH -- it's a UDP Packet */
668 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
670 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
672 if (up->pcrlen == 0) { /* full coverage was set */
673 net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n",
674 UDP_SKB_CB(skb)->cscov, skb->len);
677 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
678 net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n",
679 UDP_SKB_CB(skb)->cscov, up->pcrlen);
684 prefetch(&sk->sk_rmem_alloc);
685 if (rcu_access_pointer(sk->sk_filter) &&
686 udp_lib_checksum_complete(skb))
689 if (sk_filter_trim_cap(sk, skb, sizeof(struct udphdr)))
692 udp_csum_pull_header(skb);
696 return __udpv6_queue_rcv_skb(sk, skb);
699 __UDP6_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite);
701 __UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
702 atomic_inc(&sk->sk_drops);
707 static int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
709 struct sk_buff *next, *segs;
712 if (likely(!udp_unexpected_gso(sk, skb)))
713 return udpv6_queue_rcv_one_skb(sk, skb);
715 __skb_push(skb, -skb_mac_offset(skb));
716 segs = udp_rcv_segment(sk, skb, false);
717 for (skb = segs; skb; skb = next) {
719 __skb_pull(skb, skb_transport_offset(skb));
721 ret = udpv6_queue_rcv_one_skb(sk, skb);
723 ip6_protocol_deliver_rcu(dev_net(skb->dev), skb, ret,
729 static bool __udp_v6_is_mcast_sock(struct net *net, struct sock *sk,
730 __be16 loc_port, const struct in6_addr *loc_addr,
731 __be16 rmt_port, const struct in6_addr *rmt_addr,
732 int dif, int sdif, unsigned short hnum)
734 struct inet_sock *inet = inet_sk(sk);
736 if (!net_eq(sock_net(sk), net))
739 if (udp_sk(sk)->udp_port_hash != hnum ||
740 sk->sk_family != PF_INET6 ||
741 (inet->inet_dport && inet->inet_dport != rmt_port) ||
742 (!ipv6_addr_any(&sk->sk_v6_daddr) &&
743 !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) ||
744 !udp_sk_bound_dev_eq(net, sk->sk_bound_dev_if, dif, sdif) ||
745 (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) &&
746 !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr)))
748 if (!inet6_mc_check(sk, loc_addr, rmt_addr))
753 static void udp6_csum_zero_error(struct sk_buff *skb)
755 /* RFC 2460 section 8.1 says that we SHOULD log
756 * this error. Well, it is reasonable.
758 net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n",
759 &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source),
760 &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest));
764 * Note: called only from the BH handler context,
765 * so we don't need to lock the hashes.
767 static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
768 const struct in6_addr *saddr, const struct in6_addr *daddr,
769 struct udp_table *udptable, int proto)
771 struct sock *sk, *first = NULL;
772 const struct udphdr *uh = udp_hdr(skb);
773 unsigned short hnum = ntohs(uh->dest);
774 struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum);
775 unsigned int offset = offsetof(typeof(*sk), sk_node);
776 unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10);
777 int dif = inet6_iif(skb);
778 int sdif = inet6_sdif(skb);
779 struct hlist_node *node;
780 struct sk_buff *nskb;
783 hash2_any = ipv6_portaddr_hash(net, &in6addr_any, hnum) &
785 hash2 = ipv6_portaddr_hash(net, daddr, hnum) & udptable->mask;
787 hslot = &udptable->hash2[hash2];
788 offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node);
791 sk_for_each_entry_offset_rcu(sk, node, &hslot->head, offset) {
792 if (!__udp_v6_is_mcast_sock(net, sk, uh->dest, daddr,
793 uh->source, saddr, dif, sdif,
796 /* If zero checksum and no_check is not on for
797 * the socket then skip it.
799 if (!uh->check && !udp_sk(sk)->no_check6_rx)
805 nskb = skb_clone(skb, GFP_ATOMIC);
806 if (unlikely(!nskb)) {
807 atomic_inc(&sk->sk_drops);
808 __UDP6_INC_STATS(net, UDP_MIB_RCVBUFERRORS,
810 __UDP6_INC_STATS(net, UDP_MIB_INERRORS,
815 if (udpv6_queue_rcv_skb(sk, nskb) > 0)
819 /* Also lookup *:port if we are using hash2 and haven't done so yet. */
820 if (use_hash2 && hash2 != hash2_any) {
826 if (udpv6_queue_rcv_skb(first, skb) > 0)
830 __UDP6_INC_STATS(net, UDP_MIB_IGNOREDMULTI,
831 proto == IPPROTO_UDPLITE);
836 static void udp6_sk_rx_dst_set(struct sock *sk, struct dst_entry *dst)
838 if (udp_sk_rx_dst_set(sk, dst)) {
839 const struct rt6_info *rt = (const struct rt6_info *)dst;
841 inet6_sk(sk)->rx_dst_cookie = rt6_get_cookie(rt);
845 /* wrapper for udp_queue_rcv_skb tacking care of csum conversion and
846 * return code conversion for ip layer consumption
848 static int udp6_unicast_rcv_skb(struct sock *sk, struct sk_buff *skb,
853 if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk))
854 skb_checksum_try_convert(skb, IPPROTO_UDP, uh->check,
857 ret = udpv6_queue_rcv_skb(sk, skb);
859 /* a return value > 0 means to resubmit the input */
865 int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
868 const struct in6_addr *saddr, *daddr;
869 struct net *net = dev_net(skb->dev);
874 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
877 saddr = &ipv6_hdr(skb)->saddr;
878 daddr = &ipv6_hdr(skb)->daddr;
881 ulen = ntohs(uh->len);
885 if (proto == IPPROTO_UDP) {
886 /* UDP validates ulen. */
888 /* Check for jumbo payload */
892 if (ulen < sizeof(*uh))
895 if (ulen < skb->len) {
896 if (pskb_trim_rcsum(skb, ulen))
898 saddr = &ipv6_hdr(skb)->saddr;
899 daddr = &ipv6_hdr(skb)->daddr;
904 if (udp6_csum_init(skb, uh, proto))
907 /* Check if the socket is already available, e.g. due to early demux */
908 sk = skb_steal_sock(skb);
910 struct dst_entry *dst = skb_dst(skb);
913 if (unlikely(sk->sk_rx_dst != dst))
914 udp6_sk_rx_dst_set(sk, dst);
916 if (!uh->check && !udp_sk(sk)->no_check6_rx) {
918 goto report_csum_error;
921 ret = udp6_unicast_rcv_skb(sk, skb, uh);
927 * Multicast receive code
929 if (ipv6_addr_is_multicast(daddr))
930 return __udp6_lib_mcast_deliver(net, skb,
931 saddr, daddr, udptable, proto);
934 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
936 if (!uh->check && !udp_sk(sk)->no_check6_rx)
937 goto report_csum_error;
938 return udp6_unicast_rcv_skb(sk, skb, uh);
942 goto report_csum_error;
944 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
947 if (udp_lib_checksum_complete(skb))
950 __UDP6_INC_STATS(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
951 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
957 net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n",
958 proto == IPPROTO_UDPLITE ? "-Lite" : "",
959 saddr, ntohs(uh->source),
961 daddr, ntohs(uh->dest));
965 udp6_csum_zero_error(skb);
967 __UDP6_INC_STATS(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE);
969 __UDP6_INC_STATS(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
975 static struct sock *__udp6_lib_demux_lookup(struct net *net,
976 __be16 loc_port, const struct in6_addr *loc_addr,
977 __be16 rmt_port, const struct in6_addr *rmt_addr,
980 unsigned short hnum = ntohs(loc_port);
981 unsigned int hash2 = ipv6_portaddr_hash(net, loc_addr, hnum);
982 unsigned int slot2 = hash2 & udp_table.mask;
983 struct udp_hslot *hslot2 = &udp_table.hash2[slot2];
984 const __portpair ports = INET_COMBINED_PORTS(rmt_port, hnum);
987 udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) {
988 if (sk->sk_state == TCP_ESTABLISHED &&
989 INET6_MATCH(sk, net, rmt_addr, loc_addr, ports, dif, sdif))
991 /* Only check first socket in chain */
997 static void udp_v6_early_demux(struct sk_buff *skb)
999 struct net *net = dev_net(skb->dev);
1000 const struct udphdr *uh;
1002 struct dst_entry *dst;
1003 int dif = skb->dev->ifindex;
1004 int sdif = inet6_sdif(skb);
1006 if (!pskb_may_pull(skb, skb_transport_offset(skb) +
1007 sizeof(struct udphdr)))
1012 if (skb->pkt_type == PACKET_HOST)
1013 sk = __udp6_lib_demux_lookup(net, uh->dest,
1014 &ipv6_hdr(skb)->daddr,
1015 uh->source, &ipv6_hdr(skb)->saddr,
1020 if (!sk || !refcount_inc_not_zero(&sk->sk_refcnt))
1024 skb->destructor = sock_efree;
1025 dst = READ_ONCE(sk->sk_rx_dst);
1028 dst = dst_check(dst, inet6_sk(sk)->rx_dst_cookie);
1030 /* set noref for now.
1031 * any place which wants to hold dst has to call
1034 skb_dst_set_noref(skb, dst);
1038 static __inline__ int udpv6_rcv(struct sk_buff *skb)
1040 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP);
1044 * Throw away all pending data and cancel the corking. Socket is locked.
1046 static void udp_v6_flush_pending_frames(struct sock *sk)
1048 struct udp_sock *up = udp_sk(sk);
1050 if (up->pending == AF_INET)
1051 udp_flush_pending_frames(sk);
1052 else if (up->pending) {
1055 ip6_flush_pending_frames(sk);
1059 static int udpv6_pre_connect(struct sock *sk, struct sockaddr *uaddr,
1062 /* The following checks are replicated from __ip6_datagram_connect()
1063 * and intended to prevent BPF program called below from accessing
1064 * bytes that are out of the bound specified by user in addr_len.
1066 if (uaddr->sa_family == AF_INET) {
1067 if (__ipv6_only_sock(sk))
1068 return -EAFNOSUPPORT;
1069 return udp_pre_connect(sk, uaddr, addr_len);
1072 if (addr_len < SIN6_LEN_RFC2133)
1075 return BPF_CGROUP_RUN_PROG_INET6_CONNECT_LOCK(sk, uaddr);
1079 * udp6_hwcsum_outgoing - handle outgoing HW checksumming
1080 * @sk: socket we are sending on
1081 * @skb: sk_buff containing the filled-in UDP header
1082 * (checksum field must be zeroed out)
1084 static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
1085 const struct in6_addr *saddr,
1086 const struct in6_addr *daddr, int len)
1088 unsigned int offset;
1089 struct udphdr *uh = udp_hdr(skb);
1090 struct sk_buff *frags = skb_shinfo(skb)->frag_list;
1094 /* Only one fragment on the socket. */
1095 skb->csum_start = skb_transport_header(skb) - skb->head;
1096 skb->csum_offset = offsetof(struct udphdr, check);
1097 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0);
1100 * HW-checksum won't work as there are two or more
1101 * fragments on the socket so that all csums of sk_buffs
1102 * should be together
1104 offset = skb_transport_offset(skb);
1105 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
1108 skb->ip_summed = CHECKSUM_NONE;
1111 csum = csum_add(csum, frags->csum);
1112 } while ((frags = frags->next));
1114 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP,
1117 uh->check = CSUM_MANGLED_0;
1125 static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6,
1126 struct inet_cork *cork)
1128 struct sock *sk = skb->sk;
1131 int is_udplite = IS_UDPLITE(sk);
1133 int offset = skb_transport_offset(skb);
1134 int len = skb->len - offset;
1137 * Create a UDP header
1140 uh->source = fl6->fl6_sport;
1141 uh->dest = fl6->fl6_dport;
1142 uh->len = htons(len);
1145 if (cork->gso_size) {
1146 const int hlen = skb_network_header_len(skb) +
1147 sizeof(struct udphdr);
1149 if (hlen + cork->gso_size > cork->fragsize)
1151 if (skb->len > cork->gso_size * UDP_MAX_SEGMENTS)
1153 if (udp_sk(sk)->no_check6_tx)
1155 if (skb->ip_summed != CHECKSUM_PARTIAL || is_udplite ||
1156 dst_xfrm(skb_dst(skb)))
1159 skb_shinfo(skb)->gso_size = cork->gso_size;
1160 skb_shinfo(skb)->gso_type = SKB_GSO_UDP_L4;
1165 csum = udplite_csum(skb);
1166 else if (udp_sk(sk)->no_check6_tx) { /* UDP csum disabled */
1167 skb->ip_summed = CHECKSUM_NONE;
1169 } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
1171 udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, len);
1174 csum = udp_csum(skb);
1176 /* add protocol-dependent pseudo-header */
1177 uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
1178 len, fl6->flowi6_proto, csum);
1180 uh->check = CSUM_MANGLED_0;
1183 err = ip6_send_skb(skb);
1185 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) {
1186 UDP6_INC_STATS(sock_net(sk),
1187 UDP_MIB_SNDBUFERRORS, is_udplite);
1191 UDP6_INC_STATS(sock_net(sk),
1192 UDP_MIB_OUTDATAGRAMS, is_udplite);
1197 static int udp_v6_push_pending_frames(struct sock *sk)
1199 struct sk_buff *skb;
1200 struct udp_sock *up = udp_sk(sk);
1204 if (up->pending == AF_INET)
1205 return udp_push_pending_frames(sk);
1207 /* ip6_finish_skb will release the cork, so make a copy of
1210 fl6 = inet_sk(sk)->cork.fl.u.ip6;
1212 skb = ip6_finish_skb(sk);
1216 err = udp_v6_send_skb(skb, &fl6, &inet_sk(sk)->cork.base);
1224 int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
1226 struct ipv6_txoptions opt_space;
1227 struct udp_sock *up = udp_sk(sk);
1228 struct inet_sock *inet = inet_sk(sk);
1229 struct ipv6_pinfo *np = inet6_sk(sk);
1230 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
1231 struct in6_addr *daddr, *final_p, final;
1232 struct ipv6_txoptions *opt = NULL;
1233 struct ipv6_txoptions *opt_to_free = NULL;
1234 struct ip6_flowlabel *flowlabel = NULL;
1236 struct dst_entry *dst;
1237 struct ipcm6_cookie ipc6;
1238 int addr_len = msg->msg_namelen;
1239 bool connected = false;
1241 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
1243 int is_udplite = IS_UDPLITE(sk);
1244 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
1247 ipc6.gso_size = up->gso_size;
1248 ipc6.sockc.tsflags = sk->sk_tsflags;
1250 /* destination address check */
1252 if (addr_len < offsetof(struct sockaddr, sa_data))
1255 switch (sin6->sin6_family) {
1257 if (addr_len < SIN6_LEN_RFC2133)
1259 daddr = &sin6->sin6_addr;
1260 if (ipv6_addr_any(daddr) &&
1261 ipv6_addr_v4mapped(&np->saddr))
1262 ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK),
1266 goto do_udp_sendmsg;
1268 msg->msg_name = sin6 = NULL;
1269 msg->msg_namelen = addr_len = 0;
1275 } else if (!up->pending) {
1276 if (sk->sk_state != TCP_ESTABLISHED)
1277 return -EDESTADDRREQ;
1278 daddr = &sk->sk_v6_daddr;
1283 if (ipv6_addr_v4mapped(daddr)) {
1284 struct sockaddr_in sin;
1285 sin.sin_family = AF_INET;
1286 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport;
1287 sin.sin_addr.s_addr = daddr->s6_addr32[3];
1288 msg->msg_name = &sin;
1289 msg->msg_namelen = sizeof(sin);
1291 if (__ipv6_only_sock(sk))
1292 return -ENETUNREACH;
1293 return udp_sendmsg(sk, msg, len);
1297 if (up->pending == AF_INET)
1298 return udp_sendmsg(sk, msg, len);
1300 /* Rough check on arithmetic overflow,
1301 better check is made in ip6_append_data().
1303 if (len > INT_MAX - sizeof(struct udphdr))
1306 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
1309 * There are pending frames.
1310 * The socket lock must be held while it's corked.
1313 if (likely(up->pending)) {
1314 if (unlikely(up->pending != AF_INET6)) {
1316 return -EAFNOSUPPORT;
1319 goto do_append_data;
1323 ulen += sizeof(struct udphdr);
1325 memset(&fl6, 0, sizeof(fl6));
1328 if (sin6->sin6_port == 0)
1331 fl6.fl6_dport = sin6->sin6_port;
1332 daddr = &sin6->sin6_addr;
1335 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
1336 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
1337 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1344 * Otherwise it will be difficult to maintain
1347 if (sk->sk_state == TCP_ESTABLISHED &&
1348 ipv6_addr_equal(daddr, &sk->sk_v6_daddr))
1349 daddr = &sk->sk_v6_daddr;
1351 if (addr_len >= sizeof(struct sockaddr_in6) &&
1352 sin6->sin6_scope_id &&
1353 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
1354 fl6.flowi6_oif = sin6->sin6_scope_id;
1356 if (sk->sk_state != TCP_ESTABLISHED)
1357 return -EDESTADDRREQ;
1359 fl6.fl6_dport = inet->inet_dport;
1360 daddr = &sk->sk_v6_daddr;
1361 fl6.flowlabel = np->flow_label;
1365 if (!fl6.flowi6_oif)
1366 fl6.flowi6_oif = sk->sk_bound_dev_if;
1368 if (!fl6.flowi6_oif)
1369 fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex;
1371 fl6.flowi6_mark = sk->sk_mark;
1372 fl6.flowi6_uid = sk->sk_uid;
1374 if (msg->msg_controllen) {
1376 memset(opt, 0, sizeof(struct ipv6_txoptions));
1377 opt->tot_len = sizeof(*opt);
1380 err = udp_cmsg_send(sk, msg, &ipc6.gso_size);
1382 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6,
1385 fl6_sock_release(flowlabel);
1388 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
1389 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1393 if (!(opt->opt_nflen|opt->opt_flen))
1398 opt = txopt_get(np);
1402 opt = fl6_merge_options(&opt_space, flowlabel, opt);
1403 opt = ipv6_fixup_options(&opt_space, opt);
1406 fl6.flowi6_proto = sk->sk_protocol;
1407 if (!ipv6_addr_any(daddr))
1410 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
1411 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
1412 fl6.saddr = np->saddr;
1413 fl6.fl6_sport = inet->inet_sport;
1415 if (cgroup_bpf_enabled && !connected) {
1416 err = BPF_CGROUP_RUN_PROG_UDP6_SENDMSG_LOCK(sk,
1417 (struct sockaddr *)sin6, &fl6.saddr);
1421 if (ipv6_addr_v4mapped(&sin6->sin6_addr)) {
1422 /* BPF program rewrote IPv6-only by IPv4-mapped
1423 * IPv6. It's currently unsupported.
1428 if (sin6->sin6_port == 0) {
1429 /* BPF program set invalid port. Reject it. */
1433 fl6.fl6_dport = sin6->sin6_port;
1434 fl6.daddr = sin6->sin6_addr;
1438 final_p = fl6_update_dst(&fl6, opt, &final);
1442 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) {
1443 fl6.flowi6_oif = np->mcast_oif;
1445 } else if (!fl6.flowi6_oif)
1446 fl6.flowi6_oif = np->ucast_oif;
1448 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
1450 if (ipc6.tclass < 0)
1451 ipc6.tclass = np->tclass;
1453 fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel);
1455 dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p, connected);
1462 if (ipc6.hlimit < 0)
1463 ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
1465 if (msg->msg_flags&MSG_CONFIRM)
1469 /* Lockless fast path for the non-corking case */
1471 struct inet_cork_full cork;
1472 struct sk_buff *skb;
1474 skb = ip6_make_skb(sk, getfrag, msg, ulen,
1475 sizeof(struct udphdr), &ipc6,
1476 &fl6, (struct rt6_info *)dst,
1477 msg->msg_flags, &cork);
1479 if (!IS_ERR_OR_NULL(skb))
1480 err = udp_v6_send_skb(skb, &fl6, &cork.base);
1485 if (unlikely(up->pending)) {
1486 /* The socket is already corked while preparing it. */
1487 /* ... which is an evident application bug. --ANK */
1490 net_dbg_ratelimited("udp cork app bug 2\n");
1495 up->pending = AF_INET6;
1498 if (ipc6.dontfrag < 0)
1499 ipc6.dontfrag = np->dontfrag;
1501 err = ip6_append_data(sk, getfrag, msg, ulen, sizeof(struct udphdr),
1502 &ipc6, &fl6, (struct rt6_info *)dst,
1503 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
1505 udp_v6_flush_pending_frames(sk);
1507 err = udp_v6_push_pending_frames(sk);
1508 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
1512 err = np->recverr ? net_xmit_errno(err) : 0;
1518 fl6_sock_release(flowlabel);
1519 txopt_put(opt_to_free);
1523 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
1524 * ENOBUFS might not be good (it's not tunable per se), but otherwise
1525 * we don't have a good statistic (IpOutDiscards but it can be too many
1526 * things). We could add another new stat but at least for now that
1527 * seems like overkill.
1529 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
1530 UDP6_INC_STATS(sock_net(sk),
1531 UDP_MIB_SNDBUFERRORS, is_udplite);
1536 if (msg->msg_flags & MSG_PROBE)
1537 dst_confirm_neigh(dst, &fl6.daddr);
1538 if (!(msg->msg_flags&MSG_PROBE) || len)
1539 goto back_from_confirm;
1544 void udpv6_destroy_sock(struct sock *sk)
1546 struct udp_sock *up = udp_sk(sk);
1548 udp_v6_flush_pending_frames(sk);
1551 if (static_branch_unlikely(&udpv6_encap_needed_key)) {
1552 if (up->encap_type) {
1553 void (*encap_destroy)(struct sock *sk);
1554 encap_destroy = READ_ONCE(up->encap_destroy);
1558 if (up->encap_enabled)
1559 static_branch_disable(&udpv6_encap_needed_key);
1562 inet6_destroy_sock(sk);
1566 * Socket option code for UDP
1568 int udpv6_setsockopt(struct sock *sk, int level, int optname,
1569 char __user *optval, unsigned int optlen)
1571 if (level == SOL_UDP || level == SOL_UDPLITE)
1572 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1573 udp_v6_push_pending_frames);
1574 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1577 #ifdef CONFIG_COMPAT
1578 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
1579 char __user *optval, unsigned int optlen)
1581 if (level == SOL_UDP || level == SOL_UDPLITE)
1582 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1583 udp_v6_push_pending_frames);
1584 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
1588 int udpv6_getsockopt(struct sock *sk, int level, int optname,
1589 char __user *optval, int __user *optlen)
1591 if (level == SOL_UDP || level == SOL_UDPLITE)
1592 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1593 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1596 #ifdef CONFIG_COMPAT
1597 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
1598 char __user *optval, int __user *optlen)
1600 if (level == SOL_UDP || level == SOL_UDPLITE)
1601 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1602 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
1606 /* thinking of making this const? Don't.
1607 * early_demux can change based on sysctl.
1609 static struct inet6_protocol udpv6_protocol = {
1610 .early_demux = udp_v6_early_demux,
1611 .early_demux_handler = udp_v6_early_demux,
1612 .handler = udpv6_rcv,
1613 .err_handler = udpv6_err,
1614 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1617 /* ------------------------------------------------------------------------ */
1618 #ifdef CONFIG_PROC_FS
1619 int udp6_seq_show(struct seq_file *seq, void *v)
1621 if (v == SEQ_START_TOKEN) {
1622 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
1624 int bucket = ((struct udp_iter_state *)seq->private)->bucket;
1625 struct inet_sock *inet = inet_sk(v);
1626 __u16 srcp = ntohs(inet->inet_sport);
1627 __u16 destp = ntohs(inet->inet_dport);
1628 __ip6_dgram_sock_seq_show(seq, v, srcp, destp,
1629 udp_rqueue_get(v), bucket);
1634 const struct seq_operations udp6_seq_ops = {
1635 .start = udp_seq_start,
1636 .next = udp_seq_next,
1637 .stop = udp_seq_stop,
1638 .show = udp6_seq_show,
1640 EXPORT_SYMBOL(udp6_seq_ops);
1642 static struct udp_seq_afinfo udp6_seq_afinfo = {
1644 .udp_table = &udp_table,
1647 int __net_init udp6_proc_init(struct net *net)
1649 if (!proc_create_net_data("udp6", 0444, net->proc_net, &udp6_seq_ops,
1650 sizeof(struct udp_iter_state), &udp6_seq_afinfo))
1655 void udp6_proc_exit(struct net *net)
1657 remove_proc_entry("udp6", net->proc_net);
1659 #endif /* CONFIG_PROC_FS */
1661 /* ------------------------------------------------------------------------ */
1663 struct proto udpv6_prot = {
1665 .owner = THIS_MODULE,
1666 .close = udp_lib_close,
1667 .pre_connect = udpv6_pre_connect,
1668 .connect = ip6_datagram_connect,
1669 .disconnect = udp_disconnect,
1671 .init = udp_init_sock,
1672 .destroy = udpv6_destroy_sock,
1673 .setsockopt = udpv6_setsockopt,
1674 .getsockopt = udpv6_getsockopt,
1675 .sendmsg = udpv6_sendmsg,
1676 .recvmsg = udpv6_recvmsg,
1677 .release_cb = ip6_datagram_release_cb,
1678 .hash = udp_lib_hash,
1679 .unhash = udp_lib_unhash,
1680 .rehash = udp_v6_rehash,
1681 .get_port = udp_v6_get_port,
1682 .memory_allocated = &udp_memory_allocated,
1683 .sysctl_mem = sysctl_udp_mem,
1684 .sysctl_wmem_offset = offsetof(struct net, ipv4.sysctl_udp_wmem_min),
1685 .sysctl_rmem_offset = offsetof(struct net, ipv4.sysctl_udp_rmem_min),
1686 .obj_size = sizeof(struct udp6_sock),
1687 .h.udp_table = &udp_table,
1688 #ifdef CONFIG_COMPAT
1689 .compat_setsockopt = compat_udpv6_setsockopt,
1690 .compat_getsockopt = compat_udpv6_getsockopt,
1692 .diag_destroy = udp_abort,
1695 static struct inet_protosw udpv6_protosw = {
1697 .protocol = IPPROTO_UDP,
1698 .prot = &udpv6_prot,
1699 .ops = &inet6_dgram_ops,
1700 .flags = INET_PROTOSW_PERMANENT,
1703 int __init udpv6_init(void)
1707 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
1711 ret = inet6_register_protosw(&udpv6_protosw);
1713 goto out_udpv6_protocol;
1718 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1722 void udpv6_exit(void)
1724 inet6_unregister_protosw(&udpv6_protosw);
1725 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);