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/ll_poll.h>
51 #include <linux/proc_fs.h>
52 #include <linux/seq_file.h>
53 #include <trace/events/skb.h>
56 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
58 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
59 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
60 __be32 sk1_rcv_saddr = sk_rcv_saddr(sk);
61 __be32 sk2_rcv_saddr = sk_rcv_saddr(sk2);
62 int sk_ipv6only = ipv6_only_sock(sk);
63 int sk2_ipv6only = inet_v6_ipv6only(sk2);
64 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
65 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
67 /* if both are mapped, treat as IPv4 */
68 if (addr_type == IPV6_ADDR_MAPPED && addr_type2 == IPV6_ADDR_MAPPED)
69 return (!sk2_ipv6only &&
70 (!sk1_rcv_saddr || !sk2_rcv_saddr ||
71 sk1_rcv_saddr == sk2_rcv_saddr));
73 if (addr_type2 == IPV6_ADDR_ANY &&
74 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
77 if (addr_type == IPV6_ADDR_ANY &&
78 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
82 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
88 static unsigned int udp6_portaddr_hash(struct net *net,
89 const struct in6_addr *addr6,
92 unsigned int hash, mix = net_hash_mix(net);
94 if (ipv6_addr_any(addr6))
95 hash = jhash_1word(0, mix);
96 else if (ipv6_addr_v4mapped(addr6))
97 hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix);
99 hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix);
105 int udp_v6_get_port(struct sock *sk, unsigned short snum)
107 unsigned int hash2_nulladdr =
108 udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum);
109 unsigned int hash2_partial =
110 udp6_portaddr_hash(sock_net(sk), &inet6_sk(sk)->rcv_saddr, 0);
112 /* precompute partial secondary hash */
113 udp_sk(sk)->udp_portaddr_hash = hash2_partial;
114 return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal, hash2_nulladdr);
117 static void udp_v6_rehash(struct sock *sk)
119 u16 new_hash = udp6_portaddr_hash(sock_net(sk),
120 &inet6_sk(sk)->rcv_saddr,
121 inet_sk(sk)->inet_num);
123 udp_lib_rehash(sk, new_hash);
126 static inline int compute_score(struct sock *sk, struct net *net,
128 const struct in6_addr *saddr, __be16 sport,
129 const struct in6_addr *daddr, __be16 dport,
134 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum &&
135 sk->sk_family == PF_INET6) {
136 struct ipv6_pinfo *np = inet6_sk(sk);
137 struct inet_sock *inet = inet_sk(sk);
140 if (inet->inet_dport) {
141 if (inet->inet_dport != sport)
145 if (!ipv6_addr_any(&np->rcv_saddr)) {
146 if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
150 if (!ipv6_addr_any(&np->daddr)) {
151 if (!ipv6_addr_equal(&np->daddr, saddr))
155 if (sk->sk_bound_dev_if) {
156 if (sk->sk_bound_dev_if != dif)
164 #define SCORE2_MAX (1 + 1 + 1)
165 static inline int compute_score2(struct sock *sk, struct net *net,
166 const struct in6_addr *saddr, __be16 sport,
167 const struct in6_addr *daddr, unsigned short hnum,
172 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum &&
173 sk->sk_family == PF_INET6) {
174 struct ipv6_pinfo *np = inet6_sk(sk);
175 struct inet_sock *inet = inet_sk(sk);
177 if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
180 if (inet->inet_dport) {
181 if (inet->inet_dport != sport)
185 if (!ipv6_addr_any(&np->daddr)) {
186 if (!ipv6_addr_equal(&np->daddr, saddr))
190 if (sk->sk_bound_dev_if) {
191 if (sk->sk_bound_dev_if != dif)
200 /* called with read_rcu_lock() */
201 static struct sock *udp6_lib_lookup2(struct net *net,
202 const struct in6_addr *saddr, __be16 sport,
203 const struct in6_addr *daddr, unsigned int hnum, int dif,
204 struct udp_hslot *hslot2, unsigned int slot2)
206 struct sock *sk, *result;
207 struct hlist_nulls_node *node;
208 int score, badness, matches = 0, reuseport = 0;
214 udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) {
215 score = compute_score2(sk, net, saddr, sport,
217 if (score > badness) {
220 reuseport = sk->sk_reuseport;
222 hash = inet6_ehashfn(net, daddr, hnum,
225 } else if (score == SCORE2_MAX)
227 } else if (score == badness && reuseport) {
229 if (((u64)hash * matches) >> 32 == 0)
231 hash = next_pseudo_random32(hash);
235 * if the nulls value we got at the end of this lookup is
236 * not the expected one, we must restart lookup.
237 * We probably met an item that was moved to another chain.
239 if (get_nulls_value(node) != slot2)
244 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
246 else if (unlikely(compute_score2(result, net, saddr, sport,
247 daddr, hnum, dif) < badness)) {
255 struct sock *__udp6_lib_lookup(struct net *net,
256 const struct in6_addr *saddr, __be16 sport,
257 const struct in6_addr *daddr, __be16 dport,
258 int dif, struct udp_table *udptable)
260 struct sock *sk, *result;
261 struct hlist_nulls_node *node;
262 unsigned short hnum = ntohs(dport);
263 unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask);
264 struct udp_hslot *hslot2, *hslot = &udptable->hash[slot];
265 int score, badness, matches = 0, reuseport = 0;
269 if (hslot->count > 10) {
270 hash2 = udp6_portaddr_hash(net, daddr, hnum);
271 slot2 = hash2 & udptable->mask;
272 hslot2 = &udptable->hash2[slot2];
273 if (hslot->count < hslot2->count)
276 result = udp6_lib_lookup2(net, saddr, sport,
280 hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum);
281 slot2 = hash2 & udptable->mask;
282 hslot2 = &udptable->hash2[slot2];
283 if (hslot->count < hslot2->count)
286 result = udp6_lib_lookup2(net, saddr, sport,
287 &in6addr_any, hnum, dif,
296 sk_nulls_for_each_rcu(sk, node, &hslot->head) {
297 score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif);
298 if (score > badness) {
301 reuseport = sk->sk_reuseport;
303 hash = inet6_ehashfn(net, daddr, hnum,
307 } else if (score == badness && reuseport) {
309 if (((u64)hash * matches) >> 32 == 0)
311 hash = next_pseudo_random32(hash);
315 * if the nulls value we got at the end of this lookup is
316 * not the expected one, we must restart lookup.
317 * We probably met an item that was moved to another chain.
319 if (get_nulls_value(node) != slot)
323 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
325 else if (unlikely(compute_score(result, net, hnum, saddr, sport,
326 daddr, dport, dif) < badness)) {
334 EXPORT_SYMBOL_GPL(__udp6_lib_lookup);
336 static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb,
337 __be16 sport, __be16 dport,
338 struct udp_table *udptable)
341 const struct ipv6hdr *iph = ipv6_hdr(skb);
343 if (unlikely(sk = skb_steal_sock(skb)))
345 return __udp6_lib_lookup(dev_net(skb_dst(skb)->dev), &iph->saddr, sport,
346 &iph->daddr, dport, inet6_iif(skb),
350 struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport,
351 const struct in6_addr *daddr, __be16 dport, int dif)
353 return __udp6_lib_lookup(net, saddr, sport, daddr, dport, dif, &udp_table);
355 EXPORT_SYMBOL_GPL(udp6_lib_lookup);
359 * This should be easy, if there is something there we
360 * return it, otherwise we block.
363 int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
364 struct msghdr *msg, size_t len,
365 int noblock, int flags, int *addr_len)
367 struct ipv6_pinfo *np = inet6_sk(sk);
368 struct inet_sock *inet = inet_sk(sk);
370 unsigned int ulen, copied;
373 int is_udplite = IS_UDPLITE(sk);
378 *addr_len = sizeof(struct sockaddr_in6);
380 if (flags & MSG_ERRQUEUE)
381 return ipv6_recv_error(sk, msg, len);
383 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
384 return ipv6_recv_rxpmtu(sk, msg, len);
387 skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),
388 &peeked, &off, &err);
392 ulen = skb->len - sizeof(struct udphdr);
396 else if (copied < ulen)
397 msg->msg_flags |= MSG_TRUNC;
399 is_udp4 = (skb->protocol == htons(ETH_P_IP));
402 * If checksum is needed at all, try to do it while copying the
403 * data. If the data is truncated, or if we only want a partial
404 * coverage checksum (UDP-Lite), do it before the copy.
407 if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) {
408 if (udp_lib_checksum_complete(skb))
412 if (skb_csum_unnecessary(skb))
413 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr),
414 msg->msg_iov, copied);
416 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
421 trace_kfree_skb(skb, udpv6_recvmsg);
423 atomic_inc(&sk->sk_drops);
425 UDP_INC_STATS_USER(sock_net(sk),
429 UDP6_INC_STATS_USER(sock_net(sk),
437 UDP_INC_STATS_USER(sock_net(sk),
438 UDP_MIB_INDATAGRAMS, is_udplite);
440 UDP6_INC_STATS_USER(sock_net(sk),
441 UDP_MIB_INDATAGRAMS, is_udplite);
444 sock_recv_ts_and_drops(msg, sk, skb);
446 /* Copy the address. */
448 struct sockaddr_in6 *sin6;
450 sin6 = (struct sockaddr_in6 *) msg->msg_name;
451 sin6->sin6_family = AF_INET6;
452 sin6->sin6_port = udp_hdr(skb)->source;
453 sin6->sin6_flowinfo = 0;
456 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
458 sin6->sin6_scope_id = 0;
460 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
461 sin6->sin6_scope_id =
462 ipv6_iface_scope_id(&sin6->sin6_addr,
468 if (inet->cmsg_flags)
469 ip_cmsg_recv(msg, skb);
472 ip6_datagram_recv_ctl(sk, msg, skb);
476 if (flags & MSG_TRUNC)
480 skb_free_datagram_locked(sk, skb);
485 slow = lock_sock_fast(sk);
486 if (!skb_kill_datagram(sk, skb, flags)) {
488 UDP_INC_STATS_USER(sock_net(sk),
489 UDP_MIB_CSUMERRORS, is_udplite);
490 UDP_INC_STATS_USER(sock_net(sk),
491 UDP_MIB_INERRORS, is_udplite);
493 UDP6_INC_STATS_USER(sock_net(sk),
494 UDP_MIB_CSUMERRORS, is_udplite);
495 UDP6_INC_STATS_USER(sock_net(sk),
496 UDP_MIB_INERRORS, is_udplite);
499 unlock_sock_fast(sk, slow);
504 /* starting over for a new packet */
505 msg->msg_flags &= ~MSG_TRUNC;
509 void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
510 u8 type, u8 code, int offset, __be32 info,
511 struct udp_table *udptable)
513 struct ipv6_pinfo *np;
514 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
515 const struct in6_addr *saddr = &hdr->saddr;
516 const struct in6_addr *daddr = &hdr->daddr;
517 struct udphdr *uh = (struct udphdr*)(skb->data+offset);
521 sk = __udp6_lib_lookup(dev_net(skb->dev), daddr, uh->dest,
522 saddr, uh->source, inet6_iif(skb), udptable);
526 if (type == ICMPV6_PKT_TOOBIG)
527 ip6_sk_update_pmtu(skb, sk, info);
528 if (type == NDISC_REDIRECT)
529 ip6_sk_redirect(skb, sk);
533 if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
536 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
540 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
543 sk->sk_error_report(sk);
548 static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
552 if (!ipv6_addr_any(&inet6_sk(sk)->daddr))
553 sock_rps_save_rxhash(sk, skb);
555 rc = sock_queue_rcv_skb(sk, skb);
557 int is_udplite = IS_UDPLITE(sk);
559 /* Note that an ENOMEM error is charged twice */
561 UDP6_INC_STATS_BH(sock_net(sk),
562 UDP_MIB_RCVBUFERRORS, is_udplite);
563 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
570 static __inline__ void udpv6_err(struct sk_buff *skb,
571 struct inet6_skb_parm *opt, u8 type,
572 u8 code, int offset, __be32 info )
574 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table);
577 static struct static_key udpv6_encap_needed __read_mostly;
578 void udpv6_encap_enable(void)
580 if (!static_key_enabled(&udpv6_encap_needed))
581 static_key_slow_inc(&udpv6_encap_needed);
583 EXPORT_SYMBOL(udpv6_encap_enable);
585 int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
587 struct udp_sock *up = udp_sk(sk);
589 int is_udplite = IS_UDPLITE(sk);
591 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
594 if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
595 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
598 * This is an encapsulation socket so pass the skb to
599 * the socket's udp_encap_rcv() hook. Otherwise, just
600 * fall through and pass this up the UDP socket.
601 * up->encap_rcv() returns the following value:
602 * =0 if skb was successfully passed to the encap
603 * handler or was discarded by it.
604 * >0 if skb should be passed on to UDP.
605 * <0 if skb should be resubmitted as proto -N
608 /* if we're overly short, let UDP handle it */
609 encap_rcv = ACCESS_ONCE(up->encap_rcv);
610 if (skb->len > sizeof(struct udphdr) && encap_rcv != NULL) {
613 ret = encap_rcv(sk, skb);
615 UDP_INC_STATS_BH(sock_net(sk),
622 /* FALLTHROUGH -- it's a UDP Packet */
626 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
628 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
630 if (up->pcrlen == 0) { /* full coverage was set */
631 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage"
632 " %d while full coverage %d requested\n",
633 UDP_SKB_CB(skb)->cscov, skb->len);
636 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
637 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d "
638 "too small, need min %d\n",
639 UDP_SKB_CB(skb)->cscov, up->pcrlen);
644 if (rcu_access_pointer(sk->sk_filter)) {
645 if (udp_lib_checksum_complete(skb))
649 if (sk_rcvqueues_full(sk, skb, sk->sk_rcvbuf))
656 if (!sock_owned_by_user(sk))
657 rc = __udpv6_queue_rcv_skb(sk, skb);
658 else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
666 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite);
668 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
669 atomic_inc(&sk->sk_drops);
674 static struct sock *udp_v6_mcast_next(struct net *net, struct sock *sk,
675 __be16 loc_port, const struct in6_addr *loc_addr,
676 __be16 rmt_port, const struct in6_addr *rmt_addr,
679 struct hlist_nulls_node *node;
681 unsigned short num = ntohs(loc_port);
683 sk_nulls_for_each_from(s, node) {
684 struct inet_sock *inet = inet_sk(s);
686 if (!net_eq(sock_net(s), net))
689 if (udp_sk(s)->udp_port_hash == num &&
690 s->sk_family == PF_INET6) {
691 struct ipv6_pinfo *np = inet6_sk(s);
692 if (inet->inet_dport) {
693 if (inet->inet_dport != rmt_port)
696 if (!ipv6_addr_any(&np->daddr) &&
697 !ipv6_addr_equal(&np->daddr, rmt_addr))
700 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)
703 if (!ipv6_addr_any(&np->rcv_saddr)) {
704 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr))
707 if (!inet6_mc_check(s, loc_addr, rmt_addr))
715 static void flush_stack(struct sock **stack, unsigned int count,
716 struct sk_buff *skb, unsigned int final)
718 struct sk_buff *skb1 = NULL;
722 for (i = 0; i < count; i++) {
724 if (likely(skb1 == NULL))
725 skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC);
727 atomic_inc(&sk->sk_drops);
728 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS,
730 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS,
734 if (skb1 && udpv6_queue_rcv_skb(sk, skb1) <= 0)
741 * Note: called only from the BH handler context,
742 * so we don't need to lock the hashes.
744 static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
745 const struct in6_addr *saddr, const struct in6_addr *daddr,
746 struct udp_table *udptable)
748 struct sock *sk, *stack[256 / sizeof(struct sock *)];
749 const struct udphdr *uh = udp_hdr(skb);
750 struct udp_hslot *hslot = udp_hashslot(udptable, net, ntohs(uh->dest));
752 unsigned int i, count = 0;
754 spin_lock(&hslot->lock);
755 sk = sk_nulls_head(&hslot->head);
756 dif = inet6_iif(skb);
757 sk = udp_v6_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif);
760 sk = udp_v6_mcast_next(net, sk_nulls_next(sk), uh->dest, daddr,
761 uh->source, saddr, dif);
762 if (unlikely(count == ARRAY_SIZE(stack))) {
765 flush_stack(stack, count, skb, ~0);
770 * before releasing the lock, we must take reference on sockets
772 for (i = 0; i < count; i++)
775 spin_unlock(&hslot->lock);
778 flush_stack(stack, count, skb, count - 1);
780 for (i = 0; i < count; i++)
788 int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
791 struct net *net = dev_net(skb->dev);
794 const struct in6_addr *saddr, *daddr;
797 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
800 saddr = &ipv6_hdr(skb)->saddr;
801 daddr = &ipv6_hdr(skb)->daddr;
804 ulen = ntohs(uh->len);
808 if (proto == IPPROTO_UDP) {
809 /* UDP validates ulen. */
811 /* Check for jumbo payload */
815 if (ulen < sizeof(*uh))
818 if (ulen < skb->len) {
819 if (pskb_trim_rcsum(skb, ulen))
821 saddr = &ipv6_hdr(skb)->saddr;
822 daddr = &ipv6_hdr(skb)->daddr;
827 if (udp6_csum_init(skb, uh, proto))
831 * Multicast receive code
833 if (ipv6_addr_is_multicast(daddr))
834 return __udp6_lib_mcast_deliver(net, skb,
835 saddr, daddr, udptable);
840 * check socket cache ... must talk to Alan about his plans
841 * for sock caches... i'll skip this for now.
843 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
848 ret = udpv6_queue_rcv_skb(sk, skb);
851 /* a return value > 0 means to resubmit the input, but
852 * it wants the return to be -protocol, or 0
860 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
863 if (udp_lib_checksum_complete(skb))
866 UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
867 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
873 LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n",
874 proto == IPPROTO_UDPLITE ? "-Lite" : "",
883 UDP6_INC_STATS_BH(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE);
885 UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
890 static __inline__ int udpv6_rcv(struct sk_buff *skb)
892 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP);
896 * Throw away all pending data and cancel the corking. Socket is locked.
898 static void udp_v6_flush_pending_frames(struct sock *sk)
900 struct udp_sock *up = udp_sk(sk);
902 if (up->pending == AF_INET)
903 udp_flush_pending_frames(sk);
904 else if (up->pending) {
907 ip6_flush_pending_frames(sk);
912 * udp6_hwcsum_outgoing - handle outgoing HW checksumming
913 * @sk: socket we are sending on
914 * @skb: sk_buff containing the filled-in UDP header
915 * (checksum field must be zeroed out)
917 static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
918 const struct in6_addr *saddr,
919 const struct in6_addr *daddr, int len)
922 struct udphdr *uh = udp_hdr(skb);
925 if (skb_queue_len(&sk->sk_write_queue) == 1) {
926 /* Only one fragment on the socket. */
927 skb->csum_start = skb_transport_header(skb) - skb->head;
928 skb->csum_offset = offsetof(struct udphdr, check);
929 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0);
932 * HW-checksum won't work as there are two or more
933 * fragments on the socket so that all csums of sk_buffs
936 offset = skb_transport_offset(skb);
937 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
939 skb->ip_summed = CHECKSUM_NONE;
941 skb_queue_walk(&sk->sk_write_queue, skb) {
942 csum = csum_add(csum, skb->csum);
945 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP,
948 uh->check = CSUM_MANGLED_0;
956 static int udp_v6_push_pending_frames(struct sock *sk)
960 struct udp_sock *up = udp_sk(sk);
961 struct inet_sock *inet = inet_sk(sk);
962 struct flowi6 *fl6 = &inet->cork.fl.u.ip6;
964 int is_udplite = IS_UDPLITE(sk);
967 /* Grab the skbuff where UDP header space exists. */
968 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
972 * Create a UDP header
975 uh->source = fl6->fl6_sport;
976 uh->dest = fl6->fl6_dport;
977 uh->len = htons(up->len);
981 csum = udplite_csum_outgoing(sk, skb);
982 else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
983 udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr,
987 csum = udp_csum_outgoing(sk, skb);
989 /* add protocol-dependent pseudo-header */
990 uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
991 up->len, fl6->flowi6_proto, csum);
993 uh->check = CSUM_MANGLED_0;
996 err = ip6_push_pending_frames(sk);
998 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) {
999 UDP6_INC_STATS_USER(sock_net(sk),
1000 UDP_MIB_SNDBUFERRORS, is_udplite);
1004 UDP6_INC_STATS_USER(sock_net(sk),
1005 UDP_MIB_OUTDATAGRAMS, is_udplite);
1012 int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
1013 struct msghdr *msg, size_t len)
1015 struct ipv6_txoptions opt_space;
1016 struct udp_sock *up = udp_sk(sk);
1017 struct inet_sock *inet = inet_sk(sk);
1018 struct ipv6_pinfo *np = inet6_sk(sk);
1019 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
1020 struct in6_addr *daddr, *final_p, final;
1021 struct ipv6_txoptions *opt = NULL;
1022 struct ip6_flowlabel *flowlabel = NULL;
1024 struct dst_entry *dst;
1025 int addr_len = msg->msg_namelen;
1030 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
1033 int is_udplite = IS_UDPLITE(sk);
1034 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
1036 /* destination address check */
1038 if (addr_len < offsetof(struct sockaddr, sa_data))
1041 switch (sin6->sin6_family) {
1043 if (addr_len < SIN6_LEN_RFC2133)
1045 daddr = &sin6->sin6_addr;
1048 goto do_udp_sendmsg;
1050 msg->msg_name = sin6 = NULL;
1051 msg->msg_namelen = addr_len = 0;
1057 } else if (!up->pending) {
1058 if (sk->sk_state != TCP_ESTABLISHED)
1059 return -EDESTADDRREQ;
1065 if (ipv6_addr_v4mapped(daddr)) {
1066 struct sockaddr_in sin;
1067 sin.sin_family = AF_INET;
1068 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport;
1069 sin.sin_addr.s_addr = daddr->s6_addr32[3];
1070 msg->msg_name = &sin;
1071 msg->msg_namelen = sizeof(sin);
1073 if (__ipv6_only_sock(sk))
1074 return -ENETUNREACH;
1075 return udp_sendmsg(iocb, sk, msg, len);
1079 if (up->pending == AF_INET)
1080 return udp_sendmsg(iocb, sk, msg, len);
1082 /* Rough check on arithmetic overflow,
1083 better check is made in ip6_append_data().
1085 if (len > INT_MAX - sizeof(struct udphdr))
1090 * There are pending frames.
1091 * The socket lock must be held while it's corked.
1094 if (likely(up->pending)) {
1095 if (unlikely(up->pending != AF_INET6)) {
1097 return -EAFNOSUPPORT;
1100 goto do_append_data;
1104 ulen += sizeof(struct udphdr);
1106 memset(&fl6, 0, sizeof(fl6));
1109 if (sin6->sin6_port == 0)
1112 fl6.fl6_dport = sin6->sin6_port;
1113 daddr = &sin6->sin6_addr;
1116 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
1117 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
1118 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1119 if (flowlabel == NULL)
1121 daddr = &flowlabel->dst;
1126 * Otherwise it will be difficult to maintain
1129 if (sk->sk_state == TCP_ESTABLISHED &&
1130 ipv6_addr_equal(daddr, &np->daddr))
1133 if (addr_len >= sizeof(struct sockaddr_in6) &&
1134 sin6->sin6_scope_id &&
1135 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
1136 fl6.flowi6_oif = sin6->sin6_scope_id;
1138 if (sk->sk_state != TCP_ESTABLISHED)
1139 return -EDESTADDRREQ;
1141 fl6.fl6_dport = inet->inet_dport;
1143 fl6.flowlabel = np->flow_label;
1147 if (!fl6.flowi6_oif)
1148 fl6.flowi6_oif = sk->sk_bound_dev_if;
1150 if (!fl6.flowi6_oif)
1151 fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex;
1153 fl6.flowi6_mark = sk->sk_mark;
1155 if (msg->msg_controllen) {
1157 memset(opt, 0, sizeof(struct ipv6_txoptions));
1158 opt->tot_len = sizeof(*opt);
1160 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt,
1161 &hlimit, &tclass, &dontfrag);
1163 fl6_sock_release(flowlabel);
1166 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
1167 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1168 if (flowlabel == NULL)
1171 if (!(opt->opt_nflen|opt->opt_flen))
1178 opt = fl6_merge_options(&opt_space, flowlabel, opt);
1179 opt = ipv6_fixup_options(&opt_space, opt);
1181 fl6.flowi6_proto = sk->sk_protocol;
1182 if (!ipv6_addr_any(daddr))
1185 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
1186 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
1187 fl6.saddr = np->saddr;
1188 fl6.fl6_sport = inet->inet_sport;
1190 final_p = fl6_update_dst(&fl6, opt, &final);
1194 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) {
1195 fl6.flowi6_oif = np->mcast_oif;
1197 } else if (!fl6.flowi6_oif)
1198 fl6.flowi6_oif = np->ucast_oif;
1200 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
1202 dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p, true);
1210 if (ipv6_addr_is_multicast(&fl6.daddr))
1211 hlimit = np->mcast_hops;
1213 hlimit = np->hop_limit;
1215 hlimit = ip6_dst_hoplimit(dst);
1219 tclass = np->tclass;
1222 dontfrag = np->dontfrag;
1224 if (msg->msg_flags&MSG_CONFIRM)
1229 if (unlikely(up->pending)) {
1230 /* The socket is already corked while preparing it. */
1231 /* ... which is an evident application bug. --ANK */
1234 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
1239 up->pending = AF_INET6;
1243 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
1244 err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen,
1245 sizeof(struct udphdr), hlimit, tclass, opt, &fl6,
1246 (struct rt6_info*)dst,
1247 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, dontfrag);
1249 udp_v6_flush_pending_frames(sk);
1251 err = udp_v6_push_pending_frames(sk);
1252 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
1257 ip6_dst_store(sk, dst,
1258 ipv6_addr_equal(&fl6.daddr, &np->daddr) ?
1260 #ifdef CONFIG_IPV6_SUBTREES
1261 ipv6_addr_equal(&fl6.saddr, &np->saddr) ?
1272 err = np->recverr ? net_xmit_errno(err) : 0;
1276 fl6_sock_release(flowlabel);
1280 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
1281 * ENOBUFS might not be good (it's not tunable per se), but otherwise
1282 * we don't have a good statistic (IpOutDiscards but it can be too many
1283 * things). We could add another new stat but at least for now that
1284 * seems like overkill.
1286 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
1287 UDP6_INC_STATS_USER(sock_net(sk),
1288 UDP_MIB_SNDBUFERRORS, is_udplite);
1294 if (!(msg->msg_flags&MSG_PROBE) || len)
1295 goto back_from_confirm;
1300 void udpv6_destroy_sock(struct sock *sk)
1302 struct udp_sock *up = udp_sk(sk);
1304 udp_v6_flush_pending_frames(sk);
1307 if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
1308 void (*encap_destroy)(struct sock *sk);
1309 encap_destroy = ACCESS_ONCE(up->encap_destroy);
1314 inet6_destroy_sock(sk);
1318 * Socket option code for UDP
1320 int udpv6_setsockopt(struct sock *sk, int level, int optname,
1321 char __user *optval, unsigned int optlen)
1323 if (level == SOL_UDP || level == SOL_UDPLITE)
1324 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1325 udp_v6_push_pending_frames);
1326 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1329 #ifdef CONFIG_COMPAT
1330 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
1331 char __user *optval, unsigned int optlen)
1333 if (level == SOL_UDP || level == SOL_UDPLITE)
1334 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1335 udp_v6_push_pending_frames);
1336 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
1340 int udpv6_getsockopt(struct sock *sk, int level, int optname,
1341 char __user *optval, int __user *optlen)
1343 if (level == SOL_UDP || level == SOL_UDPLITE)
1344 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1345 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1348 #ifdef CONFIG_COMPAT
1349 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
1350 char __user *optval, int __user *optlen)
1352 if (level == SOL_UDP || level == SOL_UDPLITE)
1353 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1354 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
1358 static const struct inet6_protocol udpv6_protocol = {
1359 .handler = udpv6_rcv,
1360 .err_handler = udpv6_err,
1361 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1364 /* ------------------------------------------------------------------------ */
1365 #ifdef CONFIG_PROC_FS
1366 int udp6_seq_show(struct seq_file *seq, void *v)
1368 if (v == SEQ_START_TOKEN) {
1369 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
1371 int bucket = ((struct udp_iter_state *)seq->private)->bucket;
1372 struct inet_sock *inet = inet_sk(v);
1373 __u16 srcp = ntohs(inet->inet_sport);
1374 __u16 destp = ntohs(inet->inet_dport);
1375 ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket);
1380 static const struct file_operations udp6_afinfo_seq_fops = {
1381 .owner = THIS_MODULE,
1382 .open = udp_seq_open,
1384 .llseek = seq_lseek,
1385 .release = seq_release_net
1388 static struct udp_seq_afinfo udp6_seq_afinfo = {
1391 .udp_table = &udp_table,
1392 .seq_fops = &udp6_afinfo_seq_fops,
1394 .show = udp6_seq_show,
1398 int __net_init udp6_proc_init(struct net *net)
1400 return udp_proc_register(net, &udp6_seq_afinfo);
1403 void udp6_proc_exit(struct net *net) {
1404 udp_proc_unregister(net, &udp6_seq_afinfo);
1406 #endif /* CONFIG_PROC_FS */
1408 void udp_v6_clear_sk(struct sock *sk, int size)
1410 struct inet_sock *inet = inet_sk(sk);
1412 /* we do not want to clear pinet6 field, because of RCU lookups */
1413 sk_prot_clear_portaddr_nulls(sk, offsetof(struct inet_sock, pinet6));
1415 size -= offsetof(struct inet_sock, pinet6) + sizeof(inet->pinet6);
1416 memset(&inet->pinet6 + 1, 0, size);
1419 /* ------------------------------------------------------------------------ */
1421 struct proto udpv6_prot = {
1423 .owner = THIS_MODULE,
1424 .close = udp_lib_close,
1425 .connect = ip6_datagram_connect,
1426 .disconnect = udp_disconnect,
1428 .destroy = udpv6_destroy_sock,
1429 .setsockopt = udpv6_setsockopt,
1430 .getsockopt = udpv6_getsockopt,
1431 .sendmsg = udpv6_sendmsg,
1432 .recvmsg = udpv6_recvmsg,
1433 .backlog_rcv = __udpv6_queue_rcv_skb,
1434 .hash = udp_lib_hash,
1435 .unhash = udp_lib_unhash,
1436 .rehash = udp_v6_rehash,
1437 .get_port = udp_v6_get_port,
1438 .memory_allocated = &udp_memory_allocated,
1439 .sysctl_mem = sysctl_udp_mem,
1440 .sysctl_wmem = &sysctl_udp_wmem_min,
1441 .sysctl_rmem = &sysctl_udp_rmem_min,
1442 .obj_size = sizeof(struct udp6_sock),
1443 .slab_flags = SLAB_DESTROY_BY_RCU,
1444 .h.udp_table = &udp_table,
1445 #ifdef CONFIG_COMPAT
1446 .compat_setsockopt = compat_udpv6_setsockopt,
1447 .compat_getsockopt = compat_udpv6_getsockopt,
1449 .clear_sk = udp_v6_clear_sk,
1452 static struct inet_protosw udpv6_protosw = {
1454 .protocol = IPPROTO_UDP,
1455 .prot = &udpv6_prot,
1456 .ops = &inet6_dgram_ops,
1457 .no_check = UDP_CSUM_DEFAULT,
1458 .flags = INET_PROTOSW_PERMANENT,
1462 int __init udpv6_init(void)
1466 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
1470 ret = inet6_register_protosw(&udpv6_protosw);
1472 goto out_udpv6_protocol;
1477 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1481 void udpv6_exit(void)
1483 inet6_unregister_protosw(&udpv6_protosw);
1484 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);