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 <asm/uaccess.h>
40 #include <net/ndisc.h>
41 #include <net/protocol.h>
42 #include <net/transp_v6.h>
43 #include <net/ip6_route.h>
45 #include <net/tcp_states.h>
46 #include <net/ip6_checksum.h>
48 #include <net/inet6_hashtables.h>
49 #include <net/busy_poll.h>
51 #include <linux/proc_fs.h>
52 #include <linux/seq_file.h>
53 #include <trace/events/skb.h>
56 static unsigned int udp6_ehashfn(struct net *net,
57 const struct in6_addr *laddr,
59 const struct in6_addr *faddr,
62 static u32 udp6_ehash_secret __read_mostly;
63 static u32 udp_ipv6_hash_secret __read_mostly;
67 net_get_random_once(&udp6_ehash_secret,
68 sizeof(udp6_ehash_secret));
69 net_get_random_once(&udp_ipv6_hash_secret,
70 sizeof(udp_ipv6_hash_secret));
72 lhash = (__force u32)laddr->s6_addr32[3];
73 fhash = __ipv6_addr_jhash(faddr, udp_ipv6_hash_secret);
75 return __inet6_ehashfn(lhash, lport, fhash, fport,
76 udp_ipv6_hash_secret + net_hash_mix(net));
79 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
81 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
82 int sk2_ipv6only = inet_v6_ipv6only(sk2);
83 int addr_type = ipv6_addr_type(&sk->sk_v6_rcv_saddr);
84 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
86 /* if both are mapped, treat as IPv4 */
87 if (addr_type == IPV6_ADDR_MAPPED && addr_type2 == IPV6_ADDR_MAPPED)
88 return (!sk2_ipv6only &&
89 (!sk->sk_rcv_saddr || !sk2->sk_rcv_saddr ||
90 sk->sk_rcv_saddr == sk2->sk_rcv_saddr));
92 if (addr_type2 == IPV6_ADDR_ANY &&
93 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
96 if (addr_type == IPV6_ADDR_ANY &&
97 !(ipv6_only_sock(sk) && addr_type2 == IPV6_ADDR_MAPPED))
100 if (sk2_rcv_saddr6 &&
101 ipv6_addr_equal(&sk->sk_v6_rcv_saddr, sk2_rcv_saddr6))
107 static unsigned int udp6_portaddr_hash(struct net *net,
108 const struct in6_addr *addr6,
111 unsigned int hash, mix = net_hash_mix(net);
113 if (ipv6_addr_any(addr6))
114 hash = jhash_1word(0, mix);
115 else if (ipv6_addr_v4mapped(addr6))
116 hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix);
118 hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix);
124 int udp_v6_get_port(struct sock *sk, unsigned short snum)
126 unsigned int hash2_nulladdr =
127 udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum);
128 unsigned int hash2_partial =
129 udp6_portaddr_hash(sock_net(sk), &sk->sk_v6_rcv_saddr, 0);
131 /* precompute partial secondary hash */
132 udp_sk(sk)->udp_portaddr_hash = hash2_partial;
133 return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal, hash2_nulladdr);
136 static void udp_v6_rehash(struct sock *sk)
138 u16 new_hash = udp6_portaddr_hash(sock_net(sk),
139 &sk->sk_v6_rcv_saddr,
140 inet_sk(sk)->inet_num);
142 udp_lib_rehash(sk, new_hash);
145 static inline int compute_score(struct sock *sk, struct net *net,
147 const struct in6_addr *saddr, __be16 sport,
148 const struct in6_addr *daddr, __be16 dport,
153 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum &&
154 sk->sk_family == PF_INET6) {
155 struct inet_sock *inet = inet_sk(sk);
158 if (inet->inet_dport) {
159 if (inet->inet_dport != sport)
163 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
164 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr))
168 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
169 if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr))
173 if (sk->sk_bound_dev_if) {
174 if (sk->sk_bound_dev_if != dif)
182 #define SCORE2_MAX (1 + 1 + 1)
183 static inline int compute_score2(struct sock *sk, struct net *net,
184 const struct in6_addr *saddr, __be16 sport,
185 const struct in6_addr *daddr, unsigned short hnum,
190 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum &&
191 sk->sk_family == PF_INET6) {
192 struct inet_sock *inet = inet_sk(sk);
194 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr))
197 if (inet->inet_dport) {
198 if (inet->inet_dport != sport)
202 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
203 if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr))
207 if (sk->sk_bound_dev_if) {
208 if (sk->sk_bound_dev_if != dif)
217 /* called with read_rcu_lock() */
218 static struct sock *udp6_lib_lookup2(struct net *net,
219 const struct in6_addr *saddr, __be16 sport,
220 const struct in6_addr *daddr, unsigned int hnum, int dif,
221 struct udp_hslot *hslot2, unsigned int slot2)
223 struct sock *sk, *result;
224 struct hlist_nulls_node *node;
225 int score, badness, matches = 0, reuseport = 0;
231 udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) {
232 score = compute_score2(sk, net, saddr, sport,
234 if (score > badness) {
237 reuseport = sk->sk_reuseport;
239 hash = udp6_ehashfn(net, daddr, hnum,
242 } else if (score == SCORE2_MAX)
244 } else if (score == badness && reuseport) {
246 if (reciprocal_scale(hash, matches) == 0)
248 hash = next_pseudo_random32(hash);
252 * if the nulls value we got at the end of this lookup is
253 * not the expected one, we must restart lookup.
254 * We probably met an item that was moved to another chain.
256 if (get_nulls_value(node) != slot2)
261 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
263 else if (unlikely(compute_score2(result, net, saddr, sport,
264 daddr, hnum, dif) < badness)) {
272 struct sock *__udp6_lib_lookup(struct net *net,
273 const struct in6_addr *saddr, __be16 sport,
274 const struct in6_addr *daddr, __be16 dport,
275 int dif, struct udp_table *udptable)
277 struct sock *sk, *result;
278 struct hlist_nulls_node *node;
279 unsigned short hnum = ntohs(dport);
280 unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask);
281 struct udp_hslot *hslot2, *hslot = &udptable->hash[slot];
282 int score, badness, matches = 0, reuseport = 0;
286 if (hslot->count > 10) {
287 hash2 = udp6_portaddr_hash(net, daddr, hnum);
288 slot2 = hash2 & udptable->mask;
289 hslot2 = &udptable->hash2[slot2];
290 if (hslot->count < hslot2->count)
293 result = udp6_lib_lookup2(net, saddr, sport,
297 hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum);
298 slot2 = hash2 & udptable->mask;
299 hslot2 = &udptable->hash2[slot2];
300 if (hslot->count < hslot2->count)
303 result = udp6_lib_lookup2(net, saddr, sport,
304 &in6addr_any, hnum, dif,
313 sk_nulls_for_each_rcu(sk, node, &hslot->head) {
314 score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif);
315 if (score > badness) {
318 reuseport = sk->sk_reuseport;
320 hash = udp6_ehashfn(net, daddr, hnum,
324 } else if (score == badness && reuseport) {
326 if (reciprocal_scale(hash, matches) == 0)
328 hash = next_pseudo_random32(hash);
332 * if the nulls value we got at the end of this lookup is
333 * not the expected one, we must restart lookup.
334 * We probably met an item that was moved to another chain.
336 if (get_nulls_value(node) != slot)
340 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
342 else if (unlikely(compute_score(result, net, hnum, saddr, sport,
343 daddr, dport, dif) < badness)) {
351 EXPORT_SYMBOL_GPL(__udp6_lib_lookup);
353 static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb,
354 __be16 sport, __be16 dport,
355 struct udp_table *udptable)
358 const struct ipv6hdr *iph = ipv6_hdr(skb);
360 if (unlikely(sk = skb_steal_sock(skb)))
362 return __udp6_lib_lookup(dev_net(skb_dst(skb)->dev), &iph->saddr, sport,
363 &iph->daddr, dport, inet6_iif(skb),
367 struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport,
368 const struct in6_addr *daddr, __be16 dport, int dif)
370 return __udp6_lib_lookup(net, saddr, sport, daddr, dport, dif, &udp_table);
372 EXPORT_SYMBOL_GPL(udp6_lib_lookup);
376 * This should be easy, if there is something there we
377 * return it, otherwise we block.
380 int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
381 struct msghdr *msg, size_t len,
382 int noblock, int flags, int *addr_len)
384 struct ipv6_pinfo *np = inet6_sk(sk);
385 struct inet_sock *inet = inet_sk(sk);
387 unsigned int ulen, copied;
390 int is_udplite = IS_UDPLITE(sk);
394 if (flags & MSG_ERRQUEUE)
395 return ipv6_recv_error(sk, msg, len, addr_len);
397 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
398 return ipv6_recv_rxpmtu(sk, msg, len, addr_len);
401 skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),
402 &peeked, &off, &err);
406 ulen = skb->len - sizeof(struct udphdr);
410 else if (copied < ulen)
411 msg->msg_flags |= MSG_TRUNC;
413 is_udp4 = (skb->protocol == htons(ETH_P_IP));
416 * If checksum is needed at all, try to do it while copying the
417 * data. If the data is truncated, or if we only want a partial
418 * coverage checksum (UDP-Lite), do it before the copy.
421 if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) {
422 if (udp_lib_checksum_complete(skb))
426 if (skb_csum_unnecessary(skb))
427 err = skb_copy_datagram_msg(skb, sizeof(struct udphdr),
430 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
435 trace_kfree_skb(skb, udpv6_recvmsg);
437 atomic_inc(&sk->sk_drops);
439 UDP_INC_STATS_USER(sock_net(sk),
443 UDP6_INC_STATS_USER(sock_net(sk),
451 UDP_INC_STATS_USER(sock_net(sk),
452 UDP_MIB_INDATAGRAMS, is_udplite);
454 UDP6_INC_STATS_USER(sock_net(sk),
455 UDP_MIB_INDATAGRAMS, is_udplite);
458 sock_recv_ts_and_drops(msg, sk, skb);
460 /* Copy the address. */
462 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
463 sin6->sin6_family = AF_INET6;
464 sin6->sin6_port = udp_hdr(skb)->source;
465 sin6->sin6_flowinfo = 0;
468 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
470 sin6->sin6_scope_id = 0;
472 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
473 sin6->sin6_scope_id =
474 ipv6_iface_scope_id(&sin6->sin6_addr,
477 *addr_len = sizeof(*sin6);
481 ip6_datagram_recv_common_ctl(sk, msg, skb);
484 if (inet->cmsg_flags)
485 ip_cmsg_recv(msg, skb);
488 ip6_datagram_recv_specific_ctl(sk, msg, skb);
492 if (flags & MSG_TRUNC)
496 skb_free_datagram_locked(sk, skb);
501 slow = lock_sock_fast(sk);
502 if (!skb_kill_datagram(sk, skb, flags)) {
504 UDP_INC_STATS_USER(sock_net(sk),
505 UDP_MIB_CSUMERRORS, is_udplite);
506 UDP_INC_STATS_USER(sock_net(sk),
507 UDP_MIB_INERRORS, is_udplite);
509 UDP6_INC_STATS_USER(sock_net(sk),
510 UDP_MIB_CSUMERRORS, is_udplite);
511 UDP6_INC_STATS_USER(sock_net(sk),
512 UDP_MIB_INERRORS, is_udplite);
515 unlock_sock_fast(sk, slow);
520 /* starting over for a new packet */
521 msg->msg_flags &= ~MSG_TRUNC;
525 void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
526 u8 type, u8 code, int offset, __be32 info,
527 struct udp_table *udptable)
529 struct ipv6_pinfo *np;
530 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
531 const struct in6_addr *saddr = &hdr->saddr;
532 const struct in6_addr *daddr = &hdr->daddr;
533 struct udphdr *uh = (struct udphdr *)(skb->data+offset);
536 struct net *net = dev_net(skb->dev);
538 sk = __udp6_lib_lookup(net, daddr, uh->dest,
539 saddr, uh->source, inet6_iif(skb), udptable);
541 ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev),
546 if (type == ICMPV6_PKT_TOOBIG) {
547 if (!ip6_sk_accept_pmtu(sk))
549 ip6_sk_update_pmtu(skb, sk, info);
551 if (type == NDISC_REDIRECT) {
552 ip6_sk_redirect(skb, sk);
558 if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
561 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
565 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
568 sk->sk_error_report(sk);
573 static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
577 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
578 sock_rps_save_rxhash(sk, skb);
579 sk_mark_napi_id(sk, skb);
580 sk_incoming_cpu_update(sk);
583 rc = sock_queue_rcv_skb(sk, skb);
585 int is_udplite = IS_UDPLITE(sk);
587 /* Note that an ENOMEM error is charged twice */
589 UDP6_INC_STATS_BH(sock_net(sk),
590 UDP_MIB_RCVBUFERRORS, is_udplite);
591 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
598 static __inline__ void udpv6_err(struct sk_buff *skb,
599 struct inet6_skb_parm *opt, u8 type,
600 u8 code, int offset, __be32 info)
602 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table);
605 static struct static_key udpv6_encap_needed __read_mostly;
606 void udpv6_encap_enable(void)
608 if (!static_key_enabled(&udpv6_encap_needed))
609 static_key_slow_inc(&udpv6_encap_needed);
611 EXPORT_SYMBOL(udpv6_encap_enable);
613 int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
615 struct udp_sock *up = udp_sk(sk);
617 int is_udplite = IS_UDPLITE(sk);
619 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
622 if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
623 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
626 * This is an encapsulation socket so pass the skb to
627 * the socket's udp_encap_rcv() hook. Otherwise, just
628 * fall through and pass this up the UDP socket.
629 * up->encap_rcv() returns the following value:
630 * =0 if skb was successfully passed to the encap
631 * handler or was discarded by it.
632 * >0 if skb should be passed on to UDP.
633 * <0 if skb should be resubmitted as proto -N
636 /* if we're overly short, let UDP handle it */
637 encap_rcv = ACCESS_ONCE(up->encap_rcv);
638 if (skb->len > sizeof(struct udphdr) && encap_rcv != NULL) {
641 /* Verify checksum before giving to encap */
642 if (udp_lib_checksum_complete(skb))
645 ret = encap_rcv(sk, skb);
647 UDP_INC_STATS_BH(sock_net(sk),
654 /* FALLTHROUGH -- it's a UDP Packet */
658 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
660 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
662 if (up->pcrlen == 0) { /* full coverage was set */
663 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage"
664 " %d while full coverage %d requested\n",
665 UDP_SKB_CB(skb)->cscov, skb->len);
668 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
669 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d "
670 "too small, need min %d\n",
671 UDP_SKB_CB(skb)->cscov, up->pcrlen);
676 if (rcu_access_pointer(sk->sk_filter)) {
677 if (udp_lib_checksum_complete(skb))
681 if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
682 UDP6_INC_STATS_BH(sock_net(sk),
683 UDP_MIB_RCVBUFERRORS, is_udplite);
691 if (!sock_owned_by_user(sk))
692 rc = __udpv6_queue_rcv_skb(sk, skb);
693 else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
702 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite);
704 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
705 atomic_inc(&sk->sk_drops);
710 static bool __udp_v6_is_mcast_sock(struct net *net, struct sock *sk,
711 __be16 loc_port, const struct in6_addr *loc_addr,
712 __be16 rmt_port, const struct in6_addr *rmt_addr,
713 int dif, unsigned short hnum)
715 struct inet_sock *inet = inet_sk(sk);
717 if (!net_eq(sock_net(sk), net))
720 if (udp_sk(sk)->udp_port_hash != hnum ||
721 sk->sk_family != PF_INET6 ||
722 (inet->inet_dport && inet->inet_dport != rmt_port) ||
723 (!ipv6_addr_any(&sk->sk_v6_daddr) &&
724 !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) ||
725 (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif))
727 if (!inet6_mc_check(sk, loc_addr, rmt_addr))
732 static void flush_stack(struct sock **stack, unsigned int count,
733 struct sk_buff *skb, unsigned int final)
735 struct sk_buff *skb1 = NULL;
739 for (i = 0; i < count; i++) {
741 if (likely(skb1 == NULL))
742 skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC);
744 atomic_inc(&sk->sk_drops);
745 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS,
747 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS,
751 if (skb1 && udpv6_queue_rcv_skb(sk, skb1) <= 0)
759 static void udp6_csum_zero_error(struct sk_buff *skb)
761 /* RFC 2460 section 8.1 says that we SHOULD log
762 * this error. Well, it is reasonable.
764 LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n",
765 &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source),
766 &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest));
770 * Note: called only from the BH handler context,
771 * so we don't need to lock the hashes.
773 static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
774 const struct in6_addr *saddr, const struct in6_addr *daddr,
775 struct udp_table *udptable, int proto)
777 struct sock *sk, *stack[256 / sizeof(struct sock *)];
778 const struct udphdr *uh = udp_hdr(skb);
779 struct hlist_nulls_node *node;
780 unsigned short hnum = ntohs(uh->dest);
781 struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum);
782 int dif = inet6_iif(skb);
783 unsigned int count = 0, offset = offsetof(typeof(*sk), sk_nulls_node);
784 unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10);
785 bool inner_flushed = false;
788 hash2_any = udp6_portaddr_hash(net, &in6addr_any, hnum) &
790 hash2 = udp6_portaddr_hash(net, daddr, hnum) & udp_table.mask;
792 hslot = &udp_table.hash2[hash2];
793 offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node);
796 spin_lock(&hslot->lock);
797 sk_nulls_for_each_entry_offset(sk, node, &hslot->head, offset) {
798 if (__udp_v6_is_mcast_sock(net, sk,
802 /* If zero checksum and no_check is not on for
803 * the socket then skip it.
805 (uh->check || udp_sk(sk)->no_check6_rx)) {
806 if (unlikely(count == ARRAY_SIZE(stack))) {
807 flush_stack(stack, count, skb, ~0);
808 inner_flushed = true;
816 spin_unlock(&hslot->lock);
818 /* Also lookup *:port if we are using hash2 and haven't done so yet. */
819 if (use_hash2 && hash2 != hash2_any) {
825 flush_stack(stack, count, skb, count - 1);
828 UDP_INC_STATS_BH(net, UDP_MIB_IGNOREDMULTI,
829 proto == IPPROTO_UDPLITE);
835 int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
838 struct net *net = dev_net(skb->dev);
841 const struct in6_addr *saddr, *daddr;
844 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
847 saddr = &ipv6_hdr(skb)->saddr;
848 daddr = &ipv6_hdr(skb)->daddr;
851 ulen = ntohs(uh->len);
855 if (proto == IPPROTO_UDP) {
856 /* UDP validates ulen. */
858 /* Check for jumbo payload */
862 if (ulen < sizeof(*uh))
865 if (ulen < skb->len) {
866 if (pskb_trim_rcsum(skb, ulen))
868 saddr = &ipv6_hdr(skb)->saddr;
869 daddr = &ipv6_hdr(skb)->daddr;
874 if (udp6_csum_init(skb, uh, proto))
878 * Multicast receive code
880 if (ipv6_addr_is_multicast(daddr))
881 return __udp6_lib_mcast_deliver(net, skb,
882 saddr, daddr, udptable, proto);
887 * check socket cache ... must talk to Alan about his plans
888 * for sock caches... i'll skip this for now.
890 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
894 if (!uh->check && !udp_sk(sk)->no_check6_rx) {
896 udp6_csum_zero_error(skb);
900 if (udp_sk(sk)->convert_csum && uh->check && !IS_UDPLITE(sk))
901 skb_checksum_try_convert(skb, IPPROTO_UDP, uh->check,
904 ret = udpv6_queue_rcv_skb(sk, skb);
907 /* a return value > 0 means to resubmit the input, but
908 * it wants the return to be -protocol, or 0
917 udp6_csum_zero_error(skb);
921 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
924 if (udp_lib_checksum_complete(skb))
927 UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
928 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
934 LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n",
935 proto == IPPROTO_UDPLITE ? "-Lite" : "",
944 UDP6_INC_STATS_BH(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE);
946 UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
951 static __inline__ int udpv6_rcv(struct sk_buff *skb)
953 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP);
957 * Throw away all pending data and cancel the corking. Socket is locked.
959 static void udp_v6_flush_pending_frames(struct sock *sk)
961 struct udp_sock *up = udp_sk(sk);
963 if (up->pending == AF_INET)
964 udp_flush_pending_frames(sk);
965 else if (up->pending) {
968 ip6_flush_pending_frames(sk);
973 * udp6_hwcsum_outgoing - handle outgoing HW checksumming
974 * @sk: socket we are sending on
975 * @skb: sk_buff containing the filled-in UDP header
976 * (checksum field must be zeroed out)
978 static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
979 const struct in6_addr *saddr,
980 const struct in6_addr *daddr, int len)
983 struct udphdr *uh = udp_hdr(skb);
986 if (skb_queue_len(&sk->sk_write_queue) == 1) {
987 /* Only one fragment on the socket. */
988 skb->csum_start = skb_transport_header(skb) - skb->head;
989 skb->csum_offset = offsetof(struct udphdr, check);
990 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0);
993 * HW-checksum won't work as there are two or more
994 * fragments on the socket so that all csums of sk_buffs
997 offset = skb_transport_offset(skb);
998 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
1000 skb->ip_summed = CHECKSUM_NONE;
1002 skb_queue_walk(&sk->sk_write_queue, skb) {
1003 csum = csum_add(csum, skb->csum);
1006 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP,
1009 uh->check = CSUM_MANGLED_0;
1017 static int udp_v6_push_pending_frames(struct sock *sk)
1019 struct sk_buff *skb;
1021 struct udp_sock *up = udp_sk(sk);
1022 struct inet_sock *inet = inet_sk(sk);
1025 int is_udplite = IS_UDPLITE(sk);
1028 if (up->pending == AF_INET)
1029 return udp_push_pending_frames(sk);
1031 fl6 = &inet->cork.fl.u.ip6;
1033 /* Grab the skbuff where UDP header space exists. */
1034 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
1038 * Create a UDP header
1041 uh->source = fl6->fl6_sport;
1042 uh->dest = fl6->fl6_dport;
1043 uh->len = htons(up->len);
1047 csum = udplite_csum_outgoing(sk, skb);
1048 else if (up->no_check6_tx) { /* UDP csum disabled */
1049 skb->ip_summed = CHECKSUM_NONE;
1051 } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
1052 udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr,
1056 csum = udp_csum_outgoing(sk, skb);
1058 /* add protocol-dependent pseudo-header */
1059 uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
1060 up->len, fl6->flowi6_proto, csum);
1062 uh->check = CSUM_MANGLED_0;
1065 err = ip6_push_pending_frames(sk);
1067 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) {
1068 UDP6_INC_STATS_USER(sock_net(sk),
1069 UDP_MIB_SNDBUFERRORS, is_udplite);
1073 UDP6_INC_STATS_USER(sock_net(sk),
1074 UDP_MIB_OUTDATAGRAMS, is_udplite);
1081 int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
1082 struct msghdr *msg, size_t len)
1084 struct ipv6_txoptions opt_space;
1085 struct udp_sock *up = udp_sk(sk);
1086 struct inet_sock *inet = inet_sk(sk);
1087 struct ipv6_pinfo *np = inet6_sk(sk);
1088 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
1089 struct in6_addr *daddr, *final_p, final;
1090 struct ipv6_txoptions *opt = NULL;
1091 struct ip6_flowlabel *flowlabel = NULL;
1093 struct dst_entry *dst;
1094 int addr_len = msg->msg_namelen;
1099 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
1102 int is_udplite = IS_UDPLITE(sk);
1103 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
1105 /* destination address check */
1107 if (addr_len < offsetof(struct sockaddr, sa_data))
1110 switch (sin6->sin6_family) {
1112 if (addr_len < SIN6_LEN_RFC2133)
1114 daddr = &sin6->sin6_addr;
1117 goto do_udp_sendmsg;
1119 msg->msg_name = sin6 = NULL;
1120 msg->msg_namelen = addr_len = 0;
1126 } else if (!up->pending) {
1127 if (sk->sk_state != TCP_ESTABLISHED)
1128 return -EDESTADDRREQ;
1129 daddr = &sk->sk_v6_daddr;
1134 if (ipv6_addr_v4mapped(daddr)) {
1135 struct sockaddr_in sin;
1136 sin.sin_family = AF_INET;
1137 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport;
1138 sin.sin_addr.s_addr = daddr->s6_addr32[3];
1139 msg->msg_name = &sin;
1140 msg->msg_namelen = sizeof(sin);
1142 if (__ipv6_only_sock(sk))
1143 return -ENETUNREACH;
1144 return udp_sendmsg(iocb, sk, msg, len);
1148 if (up->pending == AF_INET)
1149 return udp_sendmsg(iocb, sk, msg, len);
1151 /* Rough check on arithmetic overflow,
1152 better check is made in ip6_append_data().
1154 if (len > INT_MAX - sizeof(struct udphdr))
1159 * There are pending frames.
1160 * The socket lock must be held while it's corked.
1163 if (likely(up->pending)) {
1164 if (unlikely(up->pending != AF_INET6)) {
1166 return -EAFNOSUPPORT;
1169 goto do_append_data;
1173 ulen += sizeof(struct udphdr);
1175 memset(&fl6, 0, sizeof(fl6));
1178 if (sin6->sin6_port == 0)
1181 fl6.fl6_dport = sin6->sin6_port;
1182 daddr = &sin6->sin6_addr;
1185 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
1186 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
1187 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1188 if (flowlabel == NULL)
1194 * Otherwise it will be difficult to maintain
1197 if (sk->sk_state == TCP_ESTABLISHED &&
1198 ipv6_addr_equal(daddr, &sk->sk_v6_daddr))
1199 daddr = &sk->sk_v6_daddr;
1201 if (addr_len >= sizeof(struct sockaddr_in6) &&
1202 sin6->sin6_scope_id &&
1203 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
1204 fl6.flowi6_oif = sin6->sin6_scope_id;
1206 if (sk->sk_state != TCP_ESTABLISHED)
1207 return -EDESTADDRREQ;
1209 fl6.fl6_dport = inet->inet_dport;
1210 daddr = &sk->sk_v6_daddr;
1211 fl6.flowlabel = np->flow_label;
1215 if (!fl6.flowi6_oif)
1216 fl6.flowi6_oif = sk->sk_bound_dev_if;
1218 if (!fl6.flowi6_oif)
1219 fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex;
1221 fl6.flowi6_mark = sk->sk_mark;
1223 if (msg->msg_controllen) {
1225 memset(opt, 0, sizeof(struct ipv6_txoptions));
1226 opt->tot_len = sizeof(*opt);
1228 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt,
1229 &hlimit, &tclass, &dontfrag);
1231 fl6_sock_release(flowlabel);
1234 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
1235 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1236 if (flowlabel == NULL)
1239 if (!(opt->opt_nflen|opt->opt_flen))
1246 opt = fl6_merge_options(&opt_space, flowlabel, opt);
1247 opt = ipv6_fixup_options(&opt_space, opt);
1249 fl6.flowi6_proto = sk->sk_protocol;
1250 if (!ipv6_addr_any(daddr))
1253 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
1254 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
1255 fl6.saddr = np->saddr;
1256 fl6.fl6_sport = inet->inet_sport;
1258 final_p = fl6_update_dst(&fl6, opt, &final);
1262 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) {
1263 fl6.flowi6_oif = np->mcast_oif;
1265 } else if (!fl6.flowi6_oif)
1266 fl6.flowi6_oif = np->ucast_oif;
1268 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
1270 dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p);
1278 hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
1281 tclass = np->tclass;
1283 if (msg->msg_flags&MSG_CONFIRM)
1288 if (unlikely(up->pending)) {
1289 /* The socket is already corked while preparing it. */
1290 /* ... which is an evident application bug. --ANK */
1293 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
1298 up->pending = AF_INET6;
1302 dontfrag = np->dontfrag;
1304 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
1305 err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen,
1306 sizeof(struct udphdr), hlimit, tclass, opt, &fl6,
1307 (struct rt6_info *)dst,
1308 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, dontfrag);
1310 udp_v6_flush_pending_frames(sk);
1312 err = udp_v6_push_pending_frames(sk);
1313 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
1318 ip6_dst_store(sk, dst,
1319 ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ?
1320 &sk->sk_v6_daddr : NULL,
1321 #ifdef CONFIG_IPV6_SUBTREES
1322 ipv6_addr_equal(&fl6.saddr, &np->saddr) ?
1333 err = np->recverr ? net_xmit_errno(err) : 0;
1337 fl6_sock_release(flowlabel);
1341 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
1342 * ENOBUFS might not be good (it's not tunable per se), but otherwise
1343 * we don't have a good statistic (IpOutDiscards but it can be too many
1344 * things). We could add another new stat but at least for now that
1345 * seems like overkill.
1347 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
1348 UDP6_INC_STATS_USER(sock_net(sk),
1349 UDP_MIB_SNDBUFERRORS, is_udplite);
1355 if (!(msg->msg_flags&MSG_PROBE) || len)
1356 goto back_from_confirm;
1361 void udpv6_destroy_sock(struct sock *sk)
1363 struct udp_sock *up = udp_sk(sk);
1365 udp_v6_flush_pending_frames(sk);
1368 if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
1369 void (*encap_destroy)(struct sock *sk);
1370 encap_destroy = ACCESS_ONCE(up->encap_destroy);
1375 inet6_destroy_sock(sk);
1379 * Socket option code for UDP
1381 int udpv6_setsockopt(struct sock *sk, int level, int optname,
1382 char __user *optval, unsigned int optlen)
1384 if (level == SOL_UDP || level == SOL_UDPLITE)
1385 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1386 udp_v6_push_pending_frames);
1387 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1390 #ifdef CONFIG_COMPAT
1391 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
1392 char __user *optval, unsigned int optlen)
1394 if (level == SOL_UDP || level == SOL_UDPLITE)
1395 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1396 udp_v6_push_pending_frames);
1397 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
1401 int udpv6_getsockopt(struct sock *sk, int level, int optname,
1402 char __user *optval, int __user *optlen)
1404 if (level == SOL_UDP || level == SOL_UDPLITE)
1405 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1406 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1409 #ifdef CONFIG_COMPAT
1410 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
1411 char __user *optval, int __user *optlen)
1413 if (level == SOL_UDP || level == SOL_UDPLITE)
1414 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1415 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
1419 static const struct inet6_protocol udpv6_protocol = {
1420 .handler = udpv6_rcv,
1421 .err_handler = udpv6_err,
1422 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1425 /* ------------------------------------------------------------------------ */
1426 #ifdef CONFIG_PROC_FS
1427 int udp6_seq_show(struct seq_file *seq, void *v)
1429 if (v == SEQ_START_TOKEN) {
1430 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
1432 int bucket = ((struct udp_iter_state *)seq->private)->bucket;
1433 struct inet_sock *inet = inet_sk(v);
1434 __u16 srcp = ntohs(inet->inet_sport);
1435 __u16 destp = ntohs(inet->inet_dport);
1436 ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket);
1441 static const struct file_operations udp6_afinfo_seq_fops = {
1442 .owner = THIS_MODULE,
1443 .open = udp_seq_open,
1445 .llseek = seq_lseek,
1446 .release = seq_release_net
1449 static struct udp_seq_afinfo udp6_seq_afinfo = {
1452 .udp_table = &udp_table,
1453 .seq_fops = &udp6_afinfo_seq_fops,
1455 .show = udp6_seq_show,
1459 int __net_init udp6_proc_init(struct net *net)
1461 return udp_proc_register(net, &udp6_seq_afinfo);
1464 void udp6_proc_exit(struct net *net) {
1465 udp_proc_unregister(net, &udp6_seq_afinfo);
1467 #endif /* CONFIG_PROC_FS */
1469 void udp_v6_clear_sk(struct sock *sk, int size)
1471 struct inet_sock *inet = inet_sk(sk);
1473 /* we do not want to clear pinet6 field, because of RCU lookups */
1474 sk_prot_clear_portaddr_nulls(sk, offsetof(struct inet_sock, pinet6));
1476 size -= offsetof(struct inet_sock, pinet6) + sizeof(inet->pinet6);
1477 memset(&inet->pinet6 + 1, 0, size);
1480 /* ------------------------------------------------------------------------ */
1482 struct proto udpv6_prot = {
1484 .owner = THIS_MODULE,
1485 .close = udp_lib_close,
1486 .connect = ip6_datagram_connect,
1487 .disconnect = udp_disconnect,
1489 .destroy = udpv6_destroy_sock,
1490 .setsockopt = udpv6_setsockopt,
1491 .getsockopt = udpv6_getsockopt,
1492 .sendmsg = udpv6_sendmsg,
1493 .recvmsg = udpv6_recvmsg,
1494 .backlog_rcv = __udpv6_queue_rcv_skb,
1495 .hash = udp_lib_hash,
1496 .unhash = udp_lib_unhash,
1497 .rehash = udp_v6_rehash,
1498 .get_port = udp_v6_get_port,
1499 .memory_allocated = &udp_memory_allocated,
1500 .sysctl_mem = sysctl_udp_mem,
1501 .sysctl_wmem = &sysctl_udp_wmem_min,
1502 .sysctl_rmem = &sysctl_udp_rmem_min,
1503 .obj_size = sizeof(struct udp6_sock),
1504 .slab_flags = SLAB_DESTROY_BY_RCU,
1505 .h.udp_table = &udp_table,
1506 #ifdef CONFIG_COMPAT
1507 .compat_setsockopt = compat_udpv6_setsockopt,
1508 .compat_getsockopt = compat_udpv6_getsockopt,
1510 .clear_sk = udp_v6_clear_sk,
1513 static struct inet_protosw udpv6_protosw = {
1515 .protocol = IPPROTO_UDP,
1516 .prot = &udpv6_prot,
1517 .ops = &inet6_dgram_ops,
1518 .flags = INET_PROTOSW_PERMANENT,
1522 int __init udpv6_init(void)
1526 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
1530 ret = inet6_register_protosw(&udpv6_protosw);
1532 goto out_udpv6_protocol;
1537 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1541 void udpv6_exit(void)
1543 inet6_unregister_protosw(&udpv6_protosw);
1544 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);