1 // SPDX-License-Identifier: GPL-2.0-or-later
4 * Linux INET6 implementation
7 * Pedro Roque <roque@di.fc.ul.pt>
9 * Based on linux/ipv4/udp.c
12 * Hideaki YOSHIFUJI : sin6_scope_id support
13 * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which
14 * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind
15 * a single port at the same time.
16 * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data
17 * YOSHIFUJI Hideaki @USAGI: convert /proc/net/udp6 to seq_file.
20 #include <linux/bpf-cgroup.h>
21 #include <linux/errno.h>
22 #include <linux/types.h>
23 #include <linux/socket.h>
24 #include <linux/sockios.h>
25 #include <linux/net.h>
26 #include <linux/in6.h>
27 #include <linux/netdevice.h>
28 #include <linux/if_arp.h>
29 #include <linux/ipv6.h>
30 #include <linux/icmpv6.h>
31 #include <linux/init.h>
32 #include <linux/module.h>
33 #include <linux/skbuff.h>
34 #include <linux/slab.h>
35 #include <linux/uaccess.h>
36 #include <linux/indirect_call_wrapper.h>
38 #include <net/addrconf.h>
39 #include <net/ndisc.h>
40 #include <net/protocol.h>
41 #include <net/transp_v6.h>
42 #include <net/ip6_route.h>
45 #include <net/tcp_states.h>
46 #include <net/ip6_checksum.h>
47 #include <net/ip6_tunnel.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 void udpv6_destruct_sock(struct sock *sk)
61 udp_destruct_common(sk);
62 inet6_sock_destruct(sk);
65 int udpv6_init_sock(struct sock *sk)
67 skb_queue_head_init(&udp_sk(sk)->reader_queue);
68 sk->sk_destruct = udpv6_destruct_sock;
69 set_bit(SOCK_SUPPORT_ZC, &sk->sk_socket->flags);
73 static u32 udp6_ehashfn(const struct net *net,
74 const struct in6_addr *laddr,
76 const struct in6_addr *faddr,
79 static u32 udp6_ehash_secret __read_mostly;
80 static u32 udp_ipv6_hash_secret __read_mostly;
84 net_get_random_once(&udp6_ehash_secret,
85 sizeof(udp6_ehash_secret));
86 net_get_random_once(&udp_ipv6_hash_secret,
87 sizeof(udp_ipv6_hash_secret));
89 lhash = (__force u32)laddr->s6_addr32[3];
90 fhash = __ipv6_addr_jhash(faddr, udp_ipv6_hash_secret);
92 return __inet6_ehashfn(lhash, lport, fhash, fport,
93 udp_ipv6_hash_secret + net_hash_mix(net));
96 int udp_v6_get_port(struct sock *sk, unsigned short snum)
98 unsigned int hash2_nulladdr =
99 ipv6_portaddr_hash(sock_net(sk), &in6addr_any, snum);
100 unsigned int hash2_partial =
101 ipv6_portaddr_hash(sock_net(sk), &sk->sk_v6_rcv_saddr, 0);
103 /* precompute partial secondary hash */
104 udp_sk(sk)->udp_portaddr_hash = hash2_partial;
105 return udp_lib_get_port(sk, snum, hash2_nulladdr);
108 void udp_v6_rehash(struct sock *sk)
110 u16 new_hash = ipv6_portaddr_hash(sock_net(sk),
111 &sk->sk_v6_rcv_saddr,
112 inet_sk(sk)->inet_num);
114 udp_lib_rehash(sk, new_hash);
117 static int compute_score(struct sock *sk, struct net *net,
118 const struct in6_addr *saddr, __be16 sport,
119 const struct in6_addr *daddr, unsigned short hnum,
122 int bound_dev_if, score;
123 struct inet_sock *inet;
126 if (!net_eq(sock_net(sk), net) ||
127 udp_sk(sk)->udp_port_hash != hnum ||
128 sk->sk_family != PF_INET6)
131 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr))
137 if (inet->inet_dport) {
138 if (inet->inet_dport != sport)
143 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
144 if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr))
149 bound_dev_if = READ_ONCE(sk->sk_bound_dev_if);
150 dev_match = udp_sk_bound_dev_eq(net, bound_dev_if, dif, sdif);
156 if (READ_ONCE(sk->sk_incoming_cpu) == raw_smp_processor_id())
162 static struct sock *lookup_reuseport(struct net *net, struct sock *sk,
164 const struct in6_addr *saddr,
166 const struct in6_addr *daddr,
169 struct sock *reuse_sk = NULL;
172 if (sk->sk_reuseport && sk->sk_state != TCP_ESTABLISHED) {
173 hash = udp6_ehashfn(net, daddr, hnum, saddr, sport);
174 reuse_sk = reuseport_select_sock(sk, hash, skb,
175 sizeof(struct udphdr));
180 /* called with rcu_read_lock() */
181 static struct sock *udp6_lib_lookup2(struct net *net,
182 const struct in6_addr *saddr, __be16 sport,
183 const struct in6_addr *daddr, unsigned int hnum,
184 int dif, int sdif, struct udp_hslot *hslot2,
187 struct sock *sk, *result;
192 udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) {
193 score = compute_score(sk, net, saddr, sport,
194 daddr, hnum, dif, sdif);
195 if (score > badness) {
196 result = lookup_reuseport(net, sk, skb,
197 saddr, sport, daddr, hnum);
198 /* Fall back to scoring if group has connections */
199 if (result && !reuseport_has_conns(sk))
202 result = result ? : sk;
209 static inline struct sock *udp6_lookup_run_bpf(struct net *net,
210 struct udp_table *udptable,
212 const struct in6_addr *saddr,
214 const struct in6_addr *daddr,
215 u16 hnum, const int dif)
217 struct sock *sk, *reuse_sk;
220 if (udptable != &udp_table)
221 return NULL; /* only UDP is supported */
223 no_reuseport = bpf_sk_lookup_run_v6(net, IPPROTO_UDP, saddr, sport,
224 daddr, hnum, dif, &sk);
225 if (no_reuseport || IS_ERR_OR_NULL(sk))
228 reuse_sk = lookup_reuseport(net, sk, skb, saddr, sport, daddr, hnum);
234 /* rcu_read_lock() must be held */
235 struct sock *__udp6_lib_lookup(struct net *net,
236 const struct in6_addr *saddr, __be16 sport,
237 const struct in6_addr *daddr, __be16 dport,
238 int dif, int sdif, struct udp_table *udptable,
241 unsigned short hnum = ntohs(dport);
242 unsigned int hash2, slot2;
243 struct udp_hslot *hslot2;
244 struct sock *result, *sk;
246 hash2 = ipv6_portaddr_hash(net, daddr, hnum);
247 slot2 = hash2 & udptable->mask;
248 hslot2 = &udptable->hash2[slot2];
250 /* Lookup connected or non-wildcard sockets */
251 result = udp6_lib_lookup2(net, saddr, sport,
252 daddr, hnum, dif, sdif,
254 if (!IS_ERR_OR_NULL(result) && result->sk_state == TCP_ESTABLISHED)
257 /* Lookup redirect from BPF */
258 if (static_branch_unlikely(&bpf_sk_lookup_enabled)) {
259 sk = udp6_lookup_run_bpf(net, udptable, skb,
260 saddr, sport, daddr, hnum, dif);
267 /* Got non-wildcard socket or error on first lookup */
271 /* Lookup wildcard sockets */
272 hash2 = ipv6_portaddr_hash(net, &in6addr_any, hnum);
273 slot2 = hash2 & udptable->mask;
274 hslot2 = &udptable->hash2[slot2];
276 result = udp6_lib_lookup2(net, saddr, sport,
277 &in6addr_any, hnum, dif, sdif,
284 EXPORT_SYMBOL_GPL(__udp6_lib_lookup);
286 static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb,
287 __be16 sport, __be16 dport,
288 struct udp_table *udptable)
290 const struct ipv6hdr *iph = ipv6_hdr(skb);
292 return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport,
293 &iph->daddr, dport, inet6_iif(skb),
294 inet6_sdif(skb), udptable, skb);
297 struct sock *udp6_lib_lookup_skb(const struct sk_buff *skb,
298 __be16 sport, __be16 dport)
300 const struct ipv6hdr *iph = ipv6_hdr(skb);
302 return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport,
303 &iph->daddr, dport, inet6_iif(skb),
304 inet6_sdif(skb), &udp_table, NULL);
307 /* Must be called under rcu_read_lock().
308 * Does increment socket refcount.
310 #if IS_ENABLED(CONFIG_NF_TPROXY_IPV6) || IS_ENABLED(CONFIG_NF_SOCKET_IPV6)
311 struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport,
312 const struct in6_addr *daddr, __be16 dport, int dif)
316 sk = __udp6_lib_lookup(net, saddr, sport, daddr, dport,
317 dif, 0, &udp_table, NULL);
318 if (sk && !refcount_inc_not_zero(&sk->sk_refcnt))
322 EXPORT_SYMBOL_GPL(udp6_lib_lookup);
325 /* do not use the scratch area len for jumbogram: their length execeeds the
326 * scratch area space; note that the IP6CB flags is still in the first
327 * cacheline, so checking for jumbograms is cheap
329 static int udp6_skb_len(struct sk_buff *skb)
331 return unlikely(inet6_is_jumbogram(skb)) ? skb->len : udp_skb_len(skb);
335 * This should be easy, if there is something there we
336 * return it, otherwise we block.
339 int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
340 int flags, int *addr_len)
342 struct ipv6_pinfo *np = inet6_sk(sk);
343 struct inet_sock *inet = inet_sk(sk);
345 unsigned int ulen, copied;
346 int off, err, peeking = flags & MSG_PEEK;
347 int is_udplite = IS_UDPLITE(sk);
348 struct udp_mib __percpu *mib;
349 bool checksum_valid = false;
352 if (flags & MSG_ERRQUEUE)
353 return ipv6_recv_error(sk, msg, len, addr_len);
355 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
356 return ipv6_recv_rxpmtu(sk, msg, len, addr_len);
359 off = sk_peek_offset(sk, flags);
360 skb = __skb_recv_udp(sk, flags, &off, &err);
364 ulen = udp6_skb_len(skb);
366 if (copied > ulen - off)
368 else if (copied < ulen)
369 msg->msg_flags |= MSG_TRUNC;
371 is_udp4 = (skb->protocol == htons(ETH_P_IP));
372 mib = __UDPX_MIB(sk, is_udp4);
375 * If checksum is needed at all, try to do it while copying the
376 * data. If the data is truncated, or if we only want a partial
377 * coverage checksum (UDP-Lite), do it before the copy.
380 if (copied < ulen || peeking ||
381 (is_udplite && UDP_SKB_CB(skb)->partial_cov)) {
382 checksum_valid = udp_skb_csum_unnecessary(skb) ||
383 !__udp_lib_checksum_complete(skb);
388 if (checksum_valid || udp_skb_csum_unnecessary(skb)) {
389 if (udp_skb_is_linear(skb))
390 err = copy_linear_skb(skb, copied, off, &msg->msg_iter);
392 err = skb_copy_datagram_msg(skb, off, msg, copied);
394 err = skb_copy_and_csum_datagram_msg(skb, off, msg);
400 atomic_inc(&sk->sk_drops);
401 SNMP_INC_STATS(mib, UDP_MIB_INERRORS);
407 SNMP_INC_STATS(mib, UDP_MIB_INDATAGRAMS);
409 sock_recv_cmsgs(msg, sk, skb);
411 /* Copy the address. */
413 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
414 sin6->sin6_family = AF_INET6;
415 sin6->sin6_port = udp_hdr(skb)->source;
416 sin6->sin6_flowinfo = 0;
419 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
421 sin6->sin6_scope_id = 0;
423 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
424 sin6->sin6_scope_id =
425 ipv6_iface_scope_id(&sin6->sin6_addr,
428 *addr_len = sizeof(*sin6);
430 BPF_CGROUP_RUN_PROG_UDP6_RECVMSG_LOCK(sk,
431 (struct sockaddr *)sin6);
434 if (udp_sk(sk)->gro_enabled)
435 udp_cmsg_recv(msg, sk, skb);
438 ip6_datagram_recv_common_ctl(sk, msg, skb);
441 if (inet->cmsg_flags)
442 ip_cmsg_recv_offset(msg, sk, skb,
443 sizeof(struct udphdr), off);
446 ip6_datagram_recv_specific_ctl(sk, msg, skb);
450 if (flags & MSG_TRUNC)
453 skb_consume_udp(sk, skb, peeking ? -err : err);
457 if (!__sk_queue_drop_skb(sk, &udp_sk(sk)->reader_queue, skb, flags,
458 udp_skb_destructor)) {
459 SNMP_INC_STATS(mib, UDP_MIB_CSUMERRORS);
460 SNMP_INC_STATS(mib, UDP_MIB_INERRORS);
464 /* starting over for a new packet, but check if we need to yield */
466 msg->msg_flags &= ~MSG_TRUNC;
470 DEFINE_STATIC_KEY_FALSE(udpv6_encap_needed_key);
471 void udpv6_encap_enable(void)
473 static_branch_inc(&udpv6_encap_needed_key);
475 EXPORT_SYMBOL(udpv6_encap_enable);
477 /* Handler for tunnels with arbitrary destination ports: no socket lookup, go
478 * through error handlers in encapsulations looking for a match.
480 static int __udp6_lib_err_encap_no_sk(struct sk_buff *skb,
481 struct inet6_skb_parm *opt,
482 u8 type, u8 code, int offset, __be32 info)
486 for (i = 0; i < MAX_IPTUN_ENCAP_OPS; i++) {
487 int (*handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
488 u8 type, u8 code, int offset, __be32 info);
489 const struct ip6_tnl_encap_ops *encap;
491 encap = rcu_dereference(ip6tun_encaps[i]);
494 handler = encap->err_handler;
495 if (handler && !handler(skb, opt, type, code, offset, info))
502 /* Try to match ICMP errors to UDP tunnels by looking up a socket without
503 * reversing source and destination port: this will match tunnels that force the
504 * same destination port on both endpoints (e.g. VXLAN, GENEVE). Note that
505 * lwtunnels might actually break this assumption by being configured with
506 * different destination ports on endpoints, in this case we won't be able to
507 * trace ICMP messages back to them.
509 * If this doesn't match any socket, probe tunnels with arbitrary destination
510 * ports (e.g. FoU, GUE): there, the receiving socket is useless, as the port
511 * we've sent packets to won't necessarily match the local destination port.
513 * Then ask the tunnel implementation to match the error against a valid
516 * Return an error if we can't find a match, the socket if we need further
517 * processing, zero otherwise.
519 static struct sock *__udp6_lib_err_encap(struct net *net,
520 const struct ipv6hdr *hdr, int offset,
522 struct udp_table *udptable,
525 struct inet6_skb_parm *opt,
526 u8 type, u8 code, __be32 info)
528 int (*lookup)(struct sock *sk, struct sk_buff *skb);
529 int network_offset, transport_offset;
532 network_offset = skb_network_offset(skb);
533 transport_offset = skb_transport_offset(skb);
535 /* Network header needs to point to the outer IPv6 header inside ICMP */
536 skb_reset_network_header(skb);
538 /* Transport header needs to point to the UDP header */
539 skb_set_transport_header(skb, offset);
544 lookup = READ_ONCE(up->encap_err_lookup);
545 if (lookup && lookup(sk, skb))
551 sk = __udp6_lib_lookup(net, &hdr->daddr, uh->source,
552 &hdr->saddr, uh->dest,
553 inet6_iif(skb), 0, udptable, skb);
557 lookup = READ_ONCE(up->encap_err_lookup);
558 if (!lookup || lookup(sk, skb))
564 sk = ERR_PTR(__udp6_lib_err_encap_no_sk(skb, opt, type, code,
568 skb_set_transport_header(skb, transport_offset);
569 skb_set_network_header(skb, network_offset);
574 int __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
575 u8 type, u8 code, int offset, __be32 info,
576 struct udp_table *udptable)
578 struct ipv6_pinfo *np;
579 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
580 const struct in6_addr *saddr = &hdr->saddr;
581 const struct in6_addr *daddr = seg6_get_daddr(skb, opt) ? : &hdr->daddr;
582 struct udphdr *uh = (struct udphdr *)(skb->data+offset);
587 struct net *net = dev_net(skb->dev);
589 sk = __udp6_lib_lookup(net, daddr, uh->dest, saddr, uh->source,
590 inet6_iif(skb), inet6_sdif(skb), udptable, NULL);
592 if (!sk || udp_sk(sk)->encap_type) {
593 /* No socket for error: try tunnels before discarding */
594 if (static_branch_unlikely(&udpv6_encap_needed_key)) {
595 sk = __udp6_lib_err_encap(net, hdr, offset, uh,
597 opt, type, code, info);
601 sk = ERR_PTR(-ENOENT);
604 __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev),
612 harderr = icmpv6_err_convert(type, code, &err);
615 if (type == ICMPV6_PKT_TOOBIG) {
616 if (!ip6_sk_accept_pmtu(sk))
618 ip6_sk_update_pmtu(skb, sk, info);
619 if (np->pmtudisc != IPV6_PMTUDISC_DONT)
622 if (type == NDISC_REDIRECT) {
624 ip6_redirect(skb, sock_net(sk), inet6_iif(skb),
625 sk->sk_mark, sk->sk_uid);
627 ip6_sk_redirect(skb, sk);
632 /* Tunnels don't have an application socket: don't pass errors back */
634 if (udp_sk(sk)->encap_err_rcv)
635 udp_sk(sk)->encap_err_rcv(sk, skb, offset);
640 if (!harderr || sk->sk_state != TCP_ESTABLISHED)
643 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
652 static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
656 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
657 sock_rps_save_rxhash(sk, skb);
658 sk_mark_napi_id(sk, skb);
659 sk_incoming_cpu_update(sk);
661 sk_mark_napi_id_once(sk, skb);
664 rc = __udp_enqueue_schedule_skb(sk, skb);
666 int is_udplite = IS_UDPLITE(sk);
667 enum skb_drop_reason drop_reason;
669 /* Note that an ENOMEM error is charged twice */
671 UDP6_INC_STATS(sock_net(sk),
672 UDP_MIB_RCVBUFERRORS, is_udplite);
673 drop_reason = SKB_DROP_REASON_SOCKET_RCVBUFF;
675 UDP6_INC_STATS(sock_net(sk),
676 UDP_MIB_MEMERRORS, is_udplite);
677 drop_reason = SKB_DROP_REASON_PROTO_MEM;
679 UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
680 kfree_skb_reason(skb, drop_reason);
687 static __inline__ int udpv6_err(struct sk_buff *skb,
688 struct inet6_skb_parm *opt, u8 type,
689 u8 code, int offset, __be32 info)
691 return __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table);
694 static int udpv6_queue_rcv_one_skb(struct sock *sk, struct sk_buff *skb)
696 enum skb_drop_reason drop_reason = SKB_DROP_REASON_NOT_SPECIFIED;
697 struct udp_sock *up = udp_sk(sk);
698 int is_udplite = IS_UDPLITE(sk);
700 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) {
701 drop_reason = SKB_DROP_REASON_XFRM_POLICY;
705 if (static_branch_unlikely(&udpv6_encap_needed_key) && up->encap_type) {
706 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
709 * This is an encapsulation socket so pass the skb to
710 * the socket's udp_encap_rcv() hook. Otherwise, just
711 * fall through and pass this up the UDP socket.
712 * up->encap_rcv() returns the following value:
713 * =0 if skb was successfully passed to the encap
714 * handler or was discarded by it.
715 * >0 if skb should be passed on to UDP.
716 * <0 if skb should be resubmitted as proto -N
719 /* if we're overly short, let UDP handle it */
720 encap_rcv = READ_ONCE(up->encap_rcv);
724 /* Verify checksum before giving to encap */
725 if (udp_lib_checksum_complete(skb))
728 ret = encap_rcv(sk, skb);
730 __UDP6_INC_STATS(sock_net(sk),
737 /* FALLTHROUGH -- it's a UDP Packet */
741 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
743 if ((up->pcflag & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
745 if (up->pcrlen == 0) { /* full coverage was set */
746 net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n",
747 UDP_SKB_CB(skb)->cscov, skb->len);
750 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
751 net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n",
752 UDP_SKB_CB(skb)->cscov, up->pcrlen);
757 prefetch(&sk->sk_rmem_alloc);
758 if (rcu_access_pointer(sk->sk_filter) &&
759 udp_lib_checksum_complete(skb))
762 if (sk_filter_trim_cap(sk, skb, sizeof(struct udphdr))) {
763 drop_reason = SKB_DROP_REASON_SOCKET_FILTER;
767 udp_csum_pull_header(skb);
771 return __udpv6_queue_rcv_skb(sk, skb);
774 drop_reason = SKB_DROP_REASON_UDP_CSUM;
775 __UDP6_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite);
777 __UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
778 atomic_inc(&sk->sk_drops);
779 kfree_skb_reason(skb, drop_reason);
783 static int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
785 struct sk_buff *next, *segs;
788 if (likely(!udp_unexpected_gso(sk, skb)))
789 return udpv6_queue_rcv_one_skb(sk, skb);
791 __skb_push(skb, -skb_mac_offset(skb));
792 segs = udp_rcv_segment(sk, skb, false);
793 skb_list_walk_safe(segs, skb, next) {
794 __skb_pull(skb, skb_transport_offset(skb));
796 udp_post_segment_fix_csum(skb);
797 ret = udpv6_queue_rcv_one_skb(sk, skb);
799 ip6_protocol_deliver_rcu(dev_net(skb->dev), skb, ret,
805 static bool __udp_v6_is_mcast_sock(struct net *net, struct sock *sk,
806 __be16 loc_port, const struct in6_addr *loc_addr,
807 __be16 rmt_port, const struct in6_addr *rmt_addr,
808 int dif, int sdif, unsigned short hnum)
810 struct inet_sock *inet = inet_sk(sk);
812 if (!net_eq(sock_net(sk), net))
815 if (udp_sk(sk)->udp_port_hash != hnum ||
816 sk->sk_family != PF_INET6 ||
817 (inet->inet_dport && inet->inet_dport != rmt_port) ||
818 (!ipv6_addr_any(&sk->sk_v6_daddr) &&
819 !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) ||
820 !udp_sk_bound_dev_eq(net, READ_ONCE(sk->sk_bound_dev_if), dif, sdif) ||
821 (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) &&
822 !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr)))
824 if (!inet6_mc_check(sk, loc_addr, rmt_addr))
829 static void udp6_csum_zero_error(struct sk_buff *skb)
831 /* RFC 2460 section 8.1 says that we SHOULD log
832 * this error. Well, it is reasonable.
834 net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n",
835 &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source),
836 &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest));
840 * Note: called only from the BH handler context,
841 * so we don't need to lock the hashes.
843 static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
844 const struct in6_addr *saddr, const struct in6_addr *daddr,
845 struct udp_table *udptable, int proto)
847 struct sock *sk, *first = NULL;
848 const struct udphdr *uh = udp_hdr(skb);
849 unsigned short hnum = ntohs(uh->dest);
850 struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum);
851 unsigned int offset = offsetof(typeof(*sk), sk_node);
852 unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10);
853 int dif = inet6_iif(skb);
854 int sdif = inet6_sdif(skb);
855 struct hlist_node *node;
856 struct sk_buff *nskb;
859 hash2_any = ipv6_portaddr_hash(net, &in6addr_any, hnum) &
861 hash2 = ipv6_portaddr_hash(net, daddr, hnum) & udptable->mask;
863 hslot = &udptable->hash2[hash2];
864 offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node);
867 sk_for_each_entry_offset_rcu(sk, node, &hslot->head, offset) {
868 if (!__udp_v6_is_mcast_sock(net, sk, uh->dest, daddr,
869 uh->source, saddr, dif, sdif,
872 /* If zero checksum and no_check is not on for
873 * the socket then skip it.
875 if (!uh->check && !udp_sk(sk)->no_check6_rx)
881 nskb = skb_clone(skb, GFP_ATOMIC);
882 if (unlikely(!nskb)) {
883 atomic_inc(&sk->sk_drops);
884 __UDP6_INC_STATS(net, UDP_MIB_RCVBUFERRORS,
886 __UDP6_INC_STATS(net, UDP_MIB_INERRORS,
891 if (udpv6_queue_rcv_skb(sk, nskb) > 0)
895 /* Also lookup *:port if we are using hash2 and haven't done so yet. */
896 if (use_hash2 && hash2 != hash2_any) {
902 if (udpv6_queue_rcv_skb(first, skb) > 0)
906 __UDP6_INC_STATS(net, UDP_MIB_IGNOREDMULTI,
907 proto == IPPROTO_UDPLITE);
912 static void udp6_sk_rx_dst_set(struct sock *sk, struct dst_entry *dst)
914 if (udp_sk_rx_dst_set(sk, dst)) {
915 const struct rt6_info *rt = (const struct rt6_info *)dst;
917 sk->sk_rx_dst_cookie = rt6_get_cookie(rt);
921 /* wrapper for udp_queue_rcv_skb tacking care of csum conversion and
922 * return code conversion for ip layer consumption
924 static int udp6_unicast_rcv_skb(struct sock *sk, struct sk_buff *skb,
929 if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk))
930 skb_checksum_try_convert(skb, IPPROTO_UDP, ip6_compute_pseudo);
932 ret = udpv6_queue_rcv_skb(sk, skb);
934 /* a return value > 0 means to resubmit the input */
940 int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
943 enum skb_drop_reason reason = SKB_DROP_REASON_NOT_SPECIFIED;
944 const struct in6_addr *saddr, *daddr;
945 struct net *net = dev_net(skb->dev);
951 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
954 saddr = &ipv6_hdr(skb)->saddr;
955 daddr = &ipv6_hdr(skb)->daddr;
958 ulen = ntohs(uh->len);
962 if (proto == IPPROTO_UDP) {
963 /* UDP validates ulen. */
965 /* Check for jumbo payload */
969 if (ulen < sizeof(*uh))
972 if (ulen < skb->len) {
973 if (pskb_trim_rcsum(skb, ulen))
975 saddr = &ipv6_hdr(skb)->saddr;
976 daddr = &ipv6_hdr(skb)->daddr;
981 if (udp6_csum_init(skb, uh, proto))
984 /* Check if the socket is already available, e.g. due to early demux */
985 sk = skb_steal_sock(skb, &refcounted);
987 struct dst_entry *dst = skb_dst(skb);
990 if (unlikely(rcu_dereference(sk->sk_rx_dst) != dst))
991 udp6_sk_rx_dst_set(sk, dst);
993 if (!uh->check && !udp_sk(sk)->no_check6_rx) {
996 goto report_csum_error;
999 ret = udp6_unicast_rcv_skb(sk, skb, uh);
1006 * Multicast receive code
1008 if (ipv6_addr_is_multicast(daddr))
1009 return __udp6_lib_mcast_deliver(net, skb,
1010 saddr, daddr, udptable, proto);
1013 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
1015 if (!uh->check && !udp_sk(sk)->no_check6_rx)
1016 goto report_csum_error;
1017 return udp6_unicast_rcv_skb(sk, skb, uh);
1020 reason = SKB_DROP_REASON_NO_SOCKET;
1023 goto report_csum_error;
1025 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
1028 if (udp_lib_checksum_complete(skb))
1031 __UDP6_INC_STATS(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
1032 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
1034 kfree_skb_reason(skb, reason);
1038 if (reason == SKB_DROP_REASON_NOT_SPECIFIED)
1039 reason = SKB_DROP_REASON_PKT_TOO_SMALL;
1040 net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n",
1041 proto == IPPROTO_UDPLITE ? "-Lite" : "",
1042 saddr, ntohs(uh->source),
1044 daddr, ntohs(uh->dest));
1048 udp6_csum_zero_error(skb);
1050 if (reason == SKB_DROP_REASON_NOT_SPECIFIED)
1051 reason = SKB_DROP_REASON_UDP_CSUM;
1052 __UDP6_INC_STATS(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE);
1054 __UDP6_INC_STATS(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
1055 kfree_skb_reason(skb, reason);
1060 static struct sock *__udp6_lib_demux_lookup(struct net *net,
1061 __be16 loc_port, const struct in6_addr *loc_addr,
1062 __be16 rmt_port, const struct in6_addr *rmt_addr,
1065 unsigned short hnum = ntohs(loc_port);
1066 unsigned int hash2 = ipv6_portaddr_hash(net, loc_addr, hnum);
1067 unsigned int slot2 = hash2 & udp_table.mask;
1068 struct udp_hslot *hslot2 = &udp_table.hash2[slot2];
1069 const __portpair ports = INET_COMBINED_PORTS(rmt_port, hnum);
1072 udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) {
1073 if (sk->sk_state == TCP_ESTABLISHED &&
1074 inet6_match(net, sk, rmt_addr, loc_addr, ports, dif, sdif))
1076 /* Only check first socket in chain */
1082 void udp_v6_early_demux(struct sk_buff *skb)
1084 struct net *net = dev_net(skb->dev);
1085 const struct udphdr *uh;
1087 struct dst_entry *dst;
1088 int dif = skb->dev->ifindex;
1089 int sdif = inet6_sdif(skb);
1091 if (!pskb_may_pull(skb, skb_transport_offset(skb) +
1092 sizeof(struct udphdr)))
1097 if (skb->pkt_type == PACKET_HOST)
1098 sk = __udp6_lib_demux_lookup(net, uh->dest,
1099 &ipv6_hdr(skb)->daddr,
1100 uh->source, &ipv6_hdr(skb)->saddr,
1105 if (!sk || !refcount_inc_not_zero(&sk->sk_refcnt))
1109 skb->destructor = sock_efree;
1110 dst = rcu_dereference(sk->sk_rx_dst);
1113 dst = dst_check(dst, sk->sk_rx_dst_cookie);
1115 /* set noref for now.
1116 * any place which wants to hold dst has to call
1119 skb_dst_set_noref(skb, dst);
1123 INDIRECT_CALLABLE_SCOPE int udpv6_rcv(struct sk_buff *skb)
1125 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP);
1129 * Throw away all pending data and cancel the corking. Socket is locked.
1131 static void udp_v6_flush_pending_frames(struct sock *sk)
1133 struct udp_sock *up = udp_sk(sk);
1135 if (up->pending == AF_INET)
1136 udp_flush_pending_frames(sk);
1137 else if (up->pending) {
1140 ip6_flush_pending_frames(sk);
1144 static int udpv6_pre_connect(struct sock *sk, struct sockaddr *uaddr,
1147 if (addr_len < offsetofend(struct sockaddr, sa_family))
1149 /* The following checks are replicated from __ip6_datagram_connect()
1150 * and intended to prevent BPF program called below from accessing
1151 * bytes that are out of the bound specified by user in addr_len.
1153 if (uaddr->sa_family == AF_INET) {
1154 if (ipv6_only_sock(sk))
1155 return -EAFNOSUPPORT;
1156 return udp_pre_connect(sk, uaddr, addr_len);
1159 if (addr_len < SIN6_LEN_RFC2133)
1162 return BPF_CGROUP_RUN_PROG_INET6_CONNECT_LOCK(sk, uaddr);
1166 * udp6_hwcsum_outgoing - handle outgoing HW checksumming
1167 * @sk: socket we are sending on
1168 * @skb: sk_buff containing the filled-in UDP header
1169 * (checksum field must be zeroed out)
1170 * @saddr: source address
1171 * @daddr: destination address
1172 * @len: length of packet
1174 static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
1175 const struct in6_addr *saddr,
1176 const struct in6_addr *daddr, int len)
1178 unsigned int offset;
1179 struct udphdr *uh = udp_hdr(skb);
1180 struct sk_buff *frags = skb_shinfo(skb)->frag_list;
1184 /* Only one fragment on the socket. */
1185 skb->csum_start = skb_transport_header(skb) - skb->head;
1186 skb->csum_offset = offsetof(struct udphdr, check);
1187 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0);
1190 * HW-checksum won't work as there are two or more
1191 * fragments on the socket so that all csums of sk_buffs
1192 * should be together
1194 offset = skb_transport_offset(skb);
1195 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
1198 skb->ip_summed = CHECKSUM_NONE;
1201 csum = csum_add(csum, frags->csum);
1202 } while ((frags = frags->next));
1204 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP,
1207 uh->check = CSUM_MANGLED_0;
1215 static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6,
1216 struct inet_cork *cork)
1218 struct sock *sk = skb->sk;
1221 int is_udplite = IS_UDPLITE(sk);
1223 int offset = skb_transport_offset(skb);
1224 int len = skb->len - offset;
1225 int datalen = len - sizeof(*uh);
1228 * Create a UDP header
1231 uh->source = fl6->fl6_sport;
1232 uh->dest = fl6->fl6_dport;
1233 uh->len = htons(len);
1236 if (cork->gso_size) {
1237 const int hlen = skb_network_header_len(skb) +
1238 sizeof(struct udphdr);
1240 if (hlen + cork->gso_size > cork->fragsize) {
1244 if (datalen > cork->gso_size * UDP_MAX_SEGMENTS) {
1248 if (udp_sk(sk)->no_check6_tx) {
1252 if (skb->ip_summed != CHECKSUM_PARTIAL || is_udplite ||
1253 dst_xfrm(skb_dst(skb))) {
1258 if (datalen > cork->gso_size) {
1259 skb_shinfo(skb)->gso_size = cork->gso_size;
1260 skb_shinfo(skb)->gso_type = SKB_GSO_UDP_L4;
1261 skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(datalen,
1268 csum = udplite_csum(skb);
1269 else if (udp_sk(sk)->no_check6_tx) { /* UDP csum disabled */
1270 skb->ip_summed = CHECKSUM_NONE;
1272 } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
1274 udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, len);
1277 csum = udp_csum(skb);
1279 /* add protocol-dependent pseudo-header */
1280 uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
1281 len, fl6->flowi6_proto, csum);
1283 uh->check = CSUM_MANGLED_0;
1286 err = ip6_send_skb(skb);
1288 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) {
1289 UDP6_INC_STATS(sock_net(sk),
1290 UDP_MIB_SNDBUFERRORS, is_udplite);
1294 UDP6_INC_STATS(sock_net(sk),
1295 UDP_MIB_OUTDATAGRAMS, is_udplite);
1300 static int udp_v6_push_pending_frames(struct sock *sk)
1302 struct sk_buff *skb;
1303 struct udp_sock *up = udp_sk(sk);
1306 if (up->pending == AF_INET)
1307 return udp_push_pending_frames(sk);
1309 skb = ip6_finish_skb(sk);
1313 err = udp_v6_send_skb(skb, &inet_sk(sk)->cork.fl.u.ip6,
1314 &inet_sk(sk)->cork.base);
1321 int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
1323 struct ipv6_txoptions opt_space;
1324 struct udp_sock *up = udp_sk(sk);
1325 struct inet_sock *inet = inet_sk(sk);
1326 struct ipv6_pinfo *np = inet6_sk(sk);
1327 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
1328 struct in6_addr *daddr, *final_p, final;
1329 struct ipv6_txoptions *opt = NULL;
1330 struct ipv6_txoptions *opt_to_free = NULL;
1331 struct ip6_flowlabel *flowlabel = NULL;
1332 struct inet_cork_full cork;
1333 struct flowi6 *fl6 = &cork.fl.u.ip6;
1334 struct dst_entry *dst;
1335 struct ipcm6_cookie ipc6;
1336 int addr_len = msg->msg_namelen;
1337 bool connected = false;
1339 int corkreq = READ_ONCE(up->corkflag) || msg->msg_flags&MSG_MORE;
1341 int is_udplite = IS_UDPLITE(sk);
1342 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
1345 ipc6.gso_size = READ_ONCE(up->gso_size);
1346 ipc6.sockc.tsflags = sk->sk_tsflags;
1347 ipc6.sockc.mark = sk->sk_mark;
1349 /* destination address check */
1351 if (addr_len < offsetof(struct sockaddr, sa_data))
1354 switch (sin6->sin6_family) {
1356 if (addr_len < SIN6_LEN_RFC2133)
1358 daddr = &sin6->sin6_addr;
1359 if (ipv6_addr_any(daddr) &&
1360 ipv6_addr_v4mapped(&np->saddr))
1361 ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK),
1365 goto do_udp_sendmsg;
1367 msg->msg_name = sin6 = NULL;
1368 msg->msg_namelen = addr_len = 0;
1374 } else if (!up->pending) {
1375 if (sk->sk_state != TCP_ESTABLISHED)
1376 return -EDESTADDRREQ;
1377 daddr = &sk->sk_v6_daddr;
1382 if (ipv6_addr_v4mapped(daddr)) {
1383 struct sockaddr_in sin;
1384 sin.sin_family = AF_INET;
1385 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport;
1386 sin.sin_addr.s_addr = daddr->s6_addr32[3];
1387 msg->msg_name = &sin;
1388 msg->msg_namelen = sizeof(sin);
1390 if (ipv6_only_sock(sk))
1391 return -ENETUNREACH;
1392 return udp_sendmsg(sk, msg, len);
1396 /* Rough check on arithmetic overflow,
1397 better check is made in ip6_append_data().
1399 if (len > INT_MAX - sizeof(struct udphdr))
1402 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
1404 if (up->pending == AF_INET)
1405 return udp_sendmsg(sk, msg, len);
1407 * There are pending frames.
1408 * The socket lock must be held while it's corked.
1411 if (likely(up->pending)) {
1412 if (unlikely(up->pending != AF_INET6)) {
1414 return -EAFNOSUPPORT;
1417 goto do_append_data;
1421 ulen += sizeof(struct udphdr);
1423 memset(fl6, 0, sizeof(*fl6));
1426 if (sin6->sin6_port == 0)
1429 fl6->fl6_dport = sin6->sin6_port;
1430 daddr = &sin6->sin6_addr;
1433 fl6->flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
1434 if (fl6->flowlabel & IPV6_FLOWLABEL_MASK) {
1435 flowlabel = fl6_sock_lookup(sk, fl6->flowlabel);
1436 if (IS_ERR(flowlabel))
1442 * Otherwise it will be difficult to maintain
1445 if (sk->sk_state == TCP_ESTABLISHED &&
1446 ipv6_addr_equal(daddr, &sk->sk_v6_daddr))
1447 daddr = &sk->sk_v6_daddr;
1449 if (addr_len >= sizeof(struct sockaddr_in6) &&
1450 sin6->sin6_scope_id &&
1451 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
1452 fl6->flowi6_oif = sin6->sin6_scope_id;
1454 if (sk->sk_state != TCP_ESTABLISHED)
1455 return -EDESTADDRREQ;
1457 fl6->fl6_dport = inet->inet_dport;
1458 daddr = &sk->sk_v6_daddr;
1459 fl6->flowlabel = np->flow_label;
1463 if (!fl6->flowi6_oif)
1464 fl6->flowi6_oif = READ_ONCE(sk->sk_bound_dev_if);
1466 if (!fl6->flowi6_oif)
1467 fl6->flowi6_oif = np->sticky_pktinfo.ipi6_ifindex;
1469 fl6->flowi6_uid = sk->sk_uid;
1471 if (msg->msg_controllen) {
1473 memset(opt, 0, sizeof(struct ipv6_txoptions));
1474 opt->tot_len = sizeof(*opt);
1477 err = udp_cmsg_send(sk, msg, &ipc6.gso_size);
1479 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, fl6,
1482 fl6_sock_release(flowlabel);
1485 if ((fl6->flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
1486 flowlabel = fl6_sock_lookup(sk, fl6->flowlabel);
1487 if (IS_ERR(flowlabel))
1490 if (!(opt->opt_nflen|opt->opt_flen))
1495 opt = txopt_get(np);
1499 opt = fl6_merge_options(&opt_space, flowlabel, opt);
1500 opt = ipv6_fixup_options(&opt_space, opt);
1503 fl6->flowi6_proto = sk->sk_protocol;
1504 fl6->flowi6_mark = ipc6.sockc.mark;
1505 fl6->daddr = *daddr;
1506 if (ipv6_addr_any(&fl6->saddr) && !ipv6_addr_any(&np->saddr))
1507 fl6->saddr = np->saddr;
1508 fl6->fl6_sport = inet->inet_sport;
1510 if (cgroup_bpf_enabled(CGROUP_UDP6_SENDMSG) && !connected) {
1511 err = BPF_CGROUP_RUN_PROG_UDP6_SENDMSG_LOCK(sk,
1512 (struct sockaddr *)sin6,
1517 if (ipv6_addr_v4mapped(&sin6->sin6_addr)) {
1518 /* BPF program rewrote IPv6-only by IPv4-mapped
1519 * IPv6. It's currently unsupported.
1524 if (sin6->sin6_port == 0) {
1525 /* BPF program set invalid port. Reject it. */
1529 fl6->fl6_dport = sin6->sin6_port;
1530 fl6->daddr = sin6->sin6_addr;
1534 if (ipv6_addr_any(&fl6->daddr))
1535 fl6->daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
1537 final_p = fl6_update_dst(fl6, opt, &final);
1541 if (!fl6->flowi6_oif && ipv6_addr_is_multicast(&fl6->daddr)) {
1542 fl6->flowi6_oif = np->mcast_oif;
1544 } else if (!fl6->flowi6_oif)
1545 fl6->flowi6_oif = np->ucast_oif;
1547 security_sk_classify_flow(sk, flowi6_to_flowi_common(fl6));
1549 if (ipc6.tclass < 0)
1550 ipc6.tclass = np->tclass;
1552 fl6->flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6->flowlabel);
1554 dst = ip6_sk_dst_lookup_flow(sk, fl6, final_p, connected);
1561 if (ipc6.hlimit < 0)
1562 ipc6.hlimit = ip6_sk_dst_hoplimit(np, fl6, dst);
1564 if (msg->msg_flags&MSG_CONFIRM)
1568 /* Lockless fast path for the non-corking case */
1570 struct sk_buff *skb;
1572 skb = ip6_make_skb(sk, getfrag, msg, ulen,
1573 sizeof(struct udphdr), &ipc6,
1574 (struct rt6_info *)dst,
1575 msg->msg_flags, &cork);
1577 if (!IS_ERR_OR_NULL(skb))
1578 err = udp_v6_send_skb(skb, fl6, &cork.base);
1579 /* ip6_make_skb steals dst reference */
1584 if (unlikely(up->pending)) {
1585 /* The socket is already corked while preparing it. */
1586 /* ... which is an evident application bug. --ANK */
1589 net_dbg_ratelimited("udp cork app bug 2\n");
1594 up->pending = AF_INET6;
1597 if (ipc6.dontfrag < 0)
1598 ipc6.dontfrag = np->dontfrag;
1600 err = ip6_append_data(sk, getfrag, msg, ulen, sizeof(struct udphdr),
1601 &ipc6, fl6, (struct rt6_info *)dst,
1602 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
1604 udp_v6_flush_pending_frames(sk);
1606 err = udp_v6_push_pending_frames(sk);
1607 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
1611 err = np->recverr ? net_xmit_errno(err) : 0;
1617 fl6_sock_release(flowlabel);
1618 txopt_put(opt_to_free);
1622 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
1623 * ENOBUFS might not be good (it's not tunable per se), but otherwise
1624 * we don't have a good statistic (IpOutDiscards but it can be too many
1625 * things). We could add another new stat but at least for now that
1626 * seems like overkill.
1628 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
1629 UDP6_INC_STATS(sock_net(sk),
1630 UDP_MIB_SNDBUFERRORS, is_udplite);
1635 if (msg->msg_flags & MSG_PROBE)
1636 dst_confirm_neigh(dst, &fl6->daddr);
1637 if (!(msg->msg_flags&MSG_PROBE) || len)
1638 goto back_from_confirm;
1643 void udpv6_destroy_sock(struct sock *sk)
1645 struct udp_sock *up = udp_sk(sk);
1648 /* protects from races with udp_abort() */
1649 sock_set_flag(sk, SOCK_DEAD);
1650 udp_v6_flush_pending_frames(sk);
1653 if (static_branch_unlikely(&udpv6_encap_needed_key)) {
1654 if (up->encap_type) {
1655 void (*encap_destroy)(struct sock *sk);
1656 encap_destroy = READ_ONCE(up->encap_destroy);
1660 if (up->encap_enabled) {
1661 static_branch_dec(&udpv6_encap_needed_key);
1662 udp_encap_disable();
1666 inet6_destroy_sock(sk);
1670 * Socket option code for UDP
1672 int udpv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
1673 unsigned int optlen)
1675 if (level == SOL_UDP || level == SOL_UDPLITE)
1676 return udp_lib_setsockopt(sk, level, optname,
1678 udp_v6_push_pending_frames);
1679 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1682 int udpv6_getsockopt(struct sock *sk, int level, int optname,
1683 char __user *optval, int __user *optlen)
1685 if (level == SOL_UDP || level == SOL_UDPLITE)
1686 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1687 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1690 static const struct inet6_protocol udpv6_protocol = {
1691 .handler = udpv6_rcv,
1692 .err_handler = udpv6_err,
1693 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1696 /* ------------------------------------------------------------------------ */
1697 #ifdef CONFIG_PROC_FS
1698 int udp6_seq_show(struct seq_file *seq, void *v)
1700 if (v == SEQ_START_TOKEN) {
1701 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
1703 int bucket = ((struct udp_iter_state *)seq->private)->bucket;
1704 struct inet_sock *inet = inet_sk(v);
1705 __u16 srcp = ntohs(inet->inet_sport);
1706 __u16 destp = ntohs(inet->inet_dport);
1707 __ip6_dgram_sock_seq_show(seq, v, srcp, destp,
1708 udp_rqueue_get(v), bucket);
1713 const struct seq_operations udp6_seq_ops = {
1714 .start = udp_seq_start,
1715 .next = udp_seq_next,
1716 .stop = udp_seq_stop,
1717 .show = udp6_seq_show,
1719 EXPORT_SYMBOL(udp6_seq_ops);
1721 static struct udp_seq_afinfo udp6_seq_afinfo = {
1723 .udp_table = &udp_table,
1726 int __net_init udp6_proc_init(struct net *net)
1728 if (!proc_create_net_data("udp6", 0444, net->proc_net, &udp6_seq_ops,
1729 sizeof(struct udp_iter_state), &udp6_seq_afinfo))
1734 void udp6_proc_exit(struct net *net)
1736 remove_proc_entry("udp6", net->proc_net);
1738 #endif /* CONFIG_PROC_FS */
1740 /* ------------------------------------------------------------------------ */
1742 struct proto udpv6_prot = {
1744 .owner = THIS_MODULE,
1745 .close = udp_lib_close,
1746 .pre_connect = udpv6_pre_connect,
1747 .connect = ip6_datagram_connect,
1748 .disconnect = udp_disconnect,
1750 .init = udpv6_init_sock,
1751 .destroy = udpv6_destroy_sock,
1752 .setsockopt = udpv6_setsockopt,
1753 .getsockopt = udpv6_getsockopt,
1754 .sendmsg = udpv6_sendmsg,
1755 .recvmsg = udpv6_recvmsg,
1756 .release_cb = ip6_datagram_release_cb,
1757 .hash = udp_lib_hash,
1758 .unhash = udp_lib_unhash,
1759 .rehash = udp_v6_rehash,
1760 .get_port = udp_v6_get_port,
1761 .put_port = udp_lib_unhash,
1762 #ifdef CONFIG_BPF_SYSCALL
1763 .psock_update_sk_prot = udp_bpf_update_proto,
1766 .memory_allocated = &udp_memory_allocated,
1767 .per_cpu_fw_alloc = &udp_memory_per_cpu_fw_alloc,
1769 .sysctl_mem = sysctl_udp_mem,
1770 .sysctl_wmem_offset = offsetof(struct net, ipv4.sysctl_udp_wmem_min),
1771 .sysctl_rmem_offset = offsetof(struct net, ipv4.sysctl_udp_rmem_min),
1772 .obj_size = sizeof(struct udp6_sock),
1773 .h.udp_table = &udp_table,
1774 .diag_destroy = udp_abort,
1777 static struct inet_protosw udpv6_protosw = {
1779 .protocol = IPPROTO_UDP,
1780 .prot = &udpv6_prot,
1781 .ops = &inet6_dgram_ops,
1782 .flags = INET_PROTOSW_PERMANENT,
1785 int __init udpv6_init(void)
1789 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
1793 ret = inet6_register_protosw(&udpv6_protosw);
1795 goto out_udpv6_protocol;
1800 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1804 void udpv6_exit(void)
1806 inet6_unregister_protosw(&udpv6_protosw);
1807 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);