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/errno.h>
21 #include <linux/types.h>
22 #include <linux/socket.h>
23 #include <linux/sockios.h>
24 #include <linux/net.h>
25 #include <linux/in6.h>
26 #include <linux/netdevice.h>
27 #include <linux/if_arp.h>
28 #include <linux/ipv6.h>
29 #include <linux/icmpv6.h>
30 #include <linux/init.h>
31 #include <linux/module.h>
32 #include <linux/skbuff.h>
33 #include <linux/slab.h>
34 #include <linux/uaccess.h>
35 #include <linux/indirect_call_wrapper.h>
37 #include <net/addrconf.h>
38 #include <net/ndisc.h>
39 #include <net/protocol.h>
40 #include <net/transp_v6.h>
41 #include <net/ip6_route.h>
44 #include <net/tcp_states.h>
45 #include <net/ip6_checksum.h>
46 #include <net/ip6_tunnel.h>
48 #include <net/inet_hashtables.h>
49 #include <net/inet6_hashtables.h>
50 #include <net/busy_poll.h>
51 #include <net/sock_reuseport.h>
53 #include <linux/proc_fs.h>
54 #include <linux/seq_file.h>
55 #include <trace/events/skb.h>
58 static void udpv6_destruct_sock(struct sock *sk)
60 udp_destruct_common(sk);
61 inet6_sock_destruct(sk);
64 int udpv6_init_sock(struct sock *sk)
66 skb_queue_head_init(&udp_sk(sk)->reader_queue);
67 sk->sk_destruct = udpv6_destruct_sock;
71 static u32 udp6_ehashfn(const struct net *net,
72 const struct in6_addr *laddr,
74 const struct in6_addr *faddr,
77 static u32 udp6_ehash_secret __read_mostly;
78 static u32 udp_ipv6_hash_secret __read_mostly;
82 net_get_random_once(&udp6_ehash_secret,
83 sizeof(udp6_ehash_secret));
84 net_get_random_once(&udp_ipv6_hash_secret,
85 sizeof(udp_ipv6_hash_secret));
87 lhash = (__force u32)laddr->s6_addr32[3];
88 fhash = __ipv6_addr_jhash(faddr, udp_ipv6_hash_secret);
90 return __inet6_ehashfn(lhash, lport, fhash, fport,
91 udp6_ehash_secret + net_hash_mix(net));
94 int udp_v6_get_port(struct sock *sk, unsigned short snum)
96 unsigned int hash2_nulladdr =
97 ipv6_portaddr_hash(sock_net(sk), &in6addr_any, snum);
98 unsigned int hash2_partial =
99 ipv6_portaddr_hash(sock_net(sk), &sk->sk_v6_rcv_saddr, 0);
101 /* precompute partial secondary hash */
102 udp_sk(sk)->udp_portaddr_hash = hash2_partial;
103 return udp_lib_get_port(sk, snum, hash2_nulladdr);
106 void udp_v6_rehash(struct sock *sk)
108 u16 new_hash = ipv6_portaddr_hash(sock_net(sk),
109 &sk->sk_v6_rcv_saddr,
110 inet_sk(sk)->inet_num);
112 udp_lib_rehash(sk, new_hash);
115 static int compute_score(struct sock *sk, struct net *net,
116 const struct in6_addr *saddr, __be16 sport,
117 const struct in6_addr *daddr, unsigned short hnum,
121 struct inet_sock *inet;
124 if (!net_eq(sock_net(sk), net) ||
125 udp_sk(sk)->udp_port_hash != hnum ||
126 sk->sk_family != PF_INET6)
129 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr))
135 if (inet->inet_dport) {
136 if (inet->inet_dport != sport)
141 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
142 if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr))
147 dev_match = udp_sk_bound_dev_eq(net, sk->sk_bound_dev_if, dif, sdif);
150 if (sk->sk_bound_dev_if)
153 if (READ_ONCE(sk->sk_incoming_cpu) == raw_smp_processor_id())
159 static struct sock *lookup_reuseport(struct net *net, struct sock *sk,
161 const struct in6_addr *saddr,
163 const struct in6_addr *daddr,
166 struct sock *reuse_sk = NULL;
169 if (sk->sk_reuseport && sk->sk_state != TCP_ESTABLISHED) {
170 hash = udp6_ehashfn(net, daddr, hnum, saddr, sport);
171 reuse_sk = reuseport_select_sock(sk, hash, skb,
172 sizeof(struct udphdr));
177 /* called with rcu_read_lock() */
178 static struct sock *udp6_lib_lookup2(struct net *net,
179 const struct in6_addr *saddr, __be16 sport,
180 const struct in6_addr *daddr, unsigned int hnum,
181 int dif, int sdif, struct udp_hslot *hslot2,
184 struct sock *sk, *result;
189 udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) {
190 score = compute_score(sk, net, saddr, sport,
191 daddr, hnum, dif, sdif);
192 if (score > badness) {
194 result = lookup_reuseport(net, sk, skb, saddr, sport, daddr, hnum);
200 /* Fall back to scoring if group has connections */
201 if (!reuseport_has_conns(sk))
204 /* Reuseport logic returned an error, keep original score. */
208 badness = compute_score(sk, net, saddr, sport,
209 daddr, hnum, dif, sdif);
215 static inline struct sock *udp6_lookup_run_bpf(struct net *net,
216 struct udp_table *udptable,
218 const struct in6_addr *saddr,
220 const struct in6_addr *daddr,
223 struct sock *sk, *reuse_sk;
226 if (udptable != &udp_table)
227 return NULL; /* only UDP is supported */
229 no_reuseport = bpf_sk_lookup_run_v6(net, IPPROTO_UDP,
230 saddr, sport, daddr, hnum, &sk);
231 if (no_reuseport || IS_ERR_OR_NULL(sk))
234 reuse_sk = lookup_reuseport(net, sk, skb, saddr, sport, daddr, hnum);
240 /* rcu_read_lock() must be held */
241 struct sock *__udp6_lib_lookup(struct net *net,
242 const struct in6_addr *saddr, __be16 sport,
243 const struct in6_addr *daddr, __be16 dport,
244 int dif, int sdif, struct udp_table *udptable,
247 unsigned short hnum = ntohs(dport);
248 unsigned int hash2, slot2;
249 struct udp_hslot *hslot2;
250 struct sock *result, *sk;
252 hash2 = ipv6_portaddr_hash(net, daddr, hnum);
253 slot2 = hash2 & udptable->mask;
254 hslot2 = &udptable->hash2[slot2];
256 /* Lookup connected or non-wildcard sockets */
257 result = udp6_lib_lookup2(net, saddr, sport,
258 daddr, hnum, dif, sdif,
260 if (!IS_ERR_OR_NULL(result) && result->sk_state == TCP_ESTABLISHED)
263 /* Lookup redirect from BPF */
264 if (static_branch_unlikely(&bpf_sk_lookup_enabled)) {
265 sk = udp6_lookup_run_bpf(net, udptable, skb,
266 saddr, sport, daddr, hnum);
273 /* Got non-wildcard socket or error on first lookup */
277 /* Lookup wildcard sockets */
278 hash2 = ipv6_portaddr_hash(net, &in6addr_any, hnum);
279 slot2 = hash2 & udptable->mask;
280 hslot2 = &udptable->hash2[slot2];
282 result = udp6_lib_lookup2(net, saddr, sport,
283 &in6addr_any, hnum, dif, sdif,
290 EXPORT_SYMBOL_GPL(__udp6_lib_lookup);
292 static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb,
293 __be16 sport, __be16 dport,
294 struct udp_table *udptable)
296 const struct ipv6hdr *iph = ipv6_hdr(skb);
298 return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport,
299 &iph->daddr, dport, inet6_iif(skb),
300 inet6_sdif(skb), udptable, skb);
303 struct sock *udp6_lib_lookup_skb(const struct sk_buff *skb,
304 __be16 sport, __be16 dport)
306 const struct ipv6hdr *iph = ipv6_hdr(skb);
308 return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport,
309 &iph->daddr, dport, inet6_iif(skb),
310 inet6_sdif(skb), &udp_table, NULL);
313 /* Must be called under rcu_read_lock().
314 * Does increment socket refcount.
316 #if IS_ENABLED(CONFIG_NF_TPROXY_IPV6) || IS_ENABLED(CONFIG_NF_SOCKET_IPV6)
317 struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport,
318 const struct in6_addr *daddr, __be16 dport, int dif)
322 sk = __udp6_lib_lookup(net, saddr, sport, daddr, dport,
323 dif, 0, &udp_table, NULL);
324 if (sk && !refcount_inc_not_zero(&sk->sk_refcnt))
328 EXPORT_SYMBOL_GPL(udp6_lib_lookup);
331 /* do not use the scratch area len for jumbogram: their length execeeds the
332 * scratch area space; note that the IP6CB flags is still in the first
333 * cacheline, so checking for jumbograms is cheap
335 static int udp6_skb_len(struct sk_buff *skb)
337 return unlikely(inet6_is_jumbogram(skb)) ? skb->len : udp_skb_len(skb);
341 * This should be easy, if there is something there we
342 * return it, otherwise we block.
345 int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
346 int noblock, int flags, int *addr_len)
348 struct ipv6_pinfo *np = inet6_sk(sk);
349 struct inet_sock *inet = inet_sk(sk);
351 unsigned int ulen, copied;
352 int off, err, peeking = flags & MSG_PEEK;
353 int is_udplite = IS_UDPLITE(sk);
354 struct udp_mib __percpu *mib;
355 bool checksum_valid = false;
358 if (flags & MSG_ERRQUEUE)
359 return ipv6_recv_error(sk, msg, len, addr_len);
361 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
362 return ipv6_recv_rxpmtu(sk, msg, len, addr_len);
365 off = sk_peek_offset(sk, flags);
366 skb = __skb_recv_udp(sk, flags, noblock, &off, &err);
370 ulen = udp6_skb_len(skb);
372 if (copied > ulen - off)
374 else if (copied < ulen)
375 msg->msg_flags |= MSG_TRUNC;
377 is_udp4 = (skb->protocol == htons(ETH_P_IP));
378 mib = __UDPX_MIB(sk, is_udp4);
381 * If checksum is needed at all, try to do it while copying the
382 * data. If the data is truncated, or if we only want a partial
383 * coverage checksum (UDP-Lite), do it before the copy.
386 if (copied < ulen || peeking ||
387 (is_udplite && UDP_SKB_CB(skb)->partial_cov)) {
388 checksum_valid = udp_skb_csum_unnecessary(skb) ||
389 !__udp_lib_checksum_complete(skb);
394 if (checksum_valid || udp_skb_csum_unnecessary(skb)) {
395 if (udp_skb_is_linear(skb))
396 err = copy_linear_skb(skb, copied, off, &msg->msg_iter);
398 err = skb_copy_datagram_msg(skb, off, msg, copied);
400 err = skb_copy_and_csum_datagram_msg(skb, off, msg);
406 atomic_inc(&sk->sk_drops);
407 SNMP_INC_STATS(mib, UDP_MIB_INERRORS);
413 SNMP_INC_STATS(mib, UDP_MIB_INDATAGRAMS);
415 sock_recv_ts_and_drops(msg, sk, skb);
417 /* Copy the address. */
419 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
420 sin6->sin6_family = AF_INET6;
421 sin6->sin6_port = udp_hdr(skb)->source;
422 sin6->sin6_flowinfo = 0;
425 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
427 sin6->sin6_scope_id = 0;
429 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
430 sin6->sin6_scope_id =
431 ipv6_iface_scope_id(&sin6->sin6_addr,
434 *addr_len = sizeof(*sin6);
436 BPF_CGROUP_RUN_PROG_UDP6_RECVMSG_LOCK(sk,
437 (struct sockaddr *)sin6);
440 if (udp_sk(sk)->gro_enabled)
441 udp_cmsg_recv(msg, sk, skb);
444 ip6_datagram_recv_common_ctl(sk, msg, skb);
447 if (inet->cmsg_flags)
448 ip_cmsg_recv_offset(msg, sk, skb,
449 sizeof(struct udphdr), off);
452 ip6_datagram_recv_specific_ctl(sk, msg, skb);
456 if (flags & MSG_TRUNC)
459 skb_consume_udp(sk, skb, peeking ? -err : err);
463 if (!__sk_queue_drop_skb(sk, &udp_sk(sk)->reader_queue, skb, flags,
464 udp_skb_destructor)) {
465 SNMP_INC_STATS(mib, UDP_MIB_CSUMERRORS);
466 SNMP_INC_STATS(mib, UDP_MIB_INERRORS);
470 /* starting over for a new packet, but check if we need to yield */
472 msg->msg_flags &= ~MSG_TRUNC;
476 DEFINE_STATIC_KEY_FALSE(udpv6_encap_needed_key);
477 void udpv6_encap_enable(void)
479 static_branch_inc(&udpv6_encap_needed_key);
481 EXPORT_SYMBOL(udpv6_encap_enable);
483 /* Handler for tunnels with arbitrary destination ports: no socket lookup, go
484 * through error handlers in encapsulations looking for a match.
486 static int __udp6_lib_err_encap_no_sk(struct sk_buff *skb,
487 struct inet6_skb_parm *opt,
488 u8 type, u8 code, int offset, __be32 info)
492 for (i = 0; i < MAX_IPTUN_ENCAP_OPS; i++) {
493 int (*handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
494 u8 type, u8 code, int offset, __be32 info);
495 const struct ip6_tnl_encap_ops *encap;
497 encap = rcu_dereference(ip6tun_encaps[i]);
500 handler = encap->err_handler;
501 if (handler && !handler(skb, opt, type, code, offset, info))
508 /* Try to match ICMP errors to UDP tunnels by looking up a socket without
509 * reversing source and destination port: this will match tunnels that force the
510 * same destination port on both endpoints (e.g. VXLAN, GENEVE). Note that
511 * lwtunnels might actually break this assumption by being configured with
512 * different destination ports on endpoints, in this case we won't be able to
513 * trace ICMP messages back to them.
515 * If this doesn't match any socket, probe tunnels with arbitrary destination
516 * ports (e.g. FoU, GUE): there, the receiving socket is useless, as the port
517 * we've sent packets to won't necessarily match the local destination port.
519 * Then ask the tunnel implementation to match the error against a valid
522 * Return an error if we can't find a match, the socket if we need further
523 * processing, zero otherwise.
525 static struct sock *__udp6_lib_err_encap(struct net *net,
526 const struct ipv6hdr *hdr, int offset,
528 struct udp_table *udptable,
531 struct inet6_skb_parm *opt,
532 u8 type, u8 code, __be32 info)
534 int (*lookup)(struct sock *sk, struct sk_buff *skb);
535 int network_offset, transport_offset;
538 network_offset = skb_network_offset(skb);
539 transport_offset = skb_transport_offset(skb);
541 /* Network header needs to point to the outer IPv6 header inside ICMP */
542 skb_reset_network_header(skb);
544 /* Transport header needs to point to the UDP header */
545 skb_set_transport_header(skb, offset);
550 lookup = READ_ONCE(up->encap_err_lookup);
551 if (lookup && lookup(sk, skb))
557 sk = __udp6_lib_lookup(net, &hdr->daddr, uh->source,
558 &hdr->saddr, uh->dest,
559 inet6_iif(skb), 0, udptable, skb);
563 lookup = READ_ONCE(up->encap_err_lookup);
564 if (!lookup || lookup(sk, skb))
570 sk = ERR_PTR(__udp6_lib_err_encap_no_sk(skb, opt, type, code,
574 skb_set_transport_header(skb, transport_offset);
575 skb_set_network_header(skb, network_offset);
580 int __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
581 u8 type, u8 code, int offset, __be32 info,
582 struct udp_table *udptable)
584 struct ipv6_pinfo *np;
585 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
586 const struct in6_addr *saddr = &hdr->saddr;
587 const struct in6_addr *daddr = seg6_get_daddr(skb, opt) ? : &hdr->daddr;
588 struct udphdr *uh = (struct udphdr *)(skb->data+offset);
593 struct net *net = dev_net(skb->dev);
595 sk = __udp6_lib_lookup(net, daddr, uh->dest, saddr, uh->source,
596 inet6_iif(skb), inet6_sdif(skb), udptable, NULL);
598 if (!sk || udp_sk(sk)->encap_type) {
599 /* No socket for error: try tunnels before discarding */
600 if (static_branch_unlikely(&udpv6_encap_needed_key)) {
601 sk = __udp6_lib_err_encap(net, hdr, offset, uh,
603 opt, type, code, info);
607 sk = ERR_PTR(-ENOENT);
610 __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev),
618 harderr = icmpv6_err_convert(type, code, &err);
621 if (type == ICMPV6_PKT_TOOBIG) {
622 if (!ip6_sk_accept_pmtu(sk))
624 ip6_sk_update_pmtu(skb, sk, info);
625 if (np->pmtudisc != IPV6_PMTUDISC_DONT)
628 if (type == NDISC_REDIRECT) {
630 ip6_redirect(skb, sock_net(sk), inet6_iif(skb),
631 sk->sk_mark, sk->sk_uid);
633 ip6_sk_redirect(skb, sk);
638 /* Tunnels don't have an application socket: don't pass errors back */
640 if (udp_sk(sk)->encap_err_rcv)
641 udp_sk(sk)->encap_err_rcv(sk, skb, offset);
646 if (!harderr || sk->sk_state != TCP_ESTABLISHED)
649 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
658 static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
662 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
663 sock_rps_save_rxhash(sk, skb);
664 sk_mark_napi_id(sk, skb);
665 sk_incoming_cpu_update(sk);
667 sk_mark_napi_id_once(sk, skb);
670 rc = __udp_enqueue_schedule_skb(sk, skb);
672 int is_udplite = IS_UDPLITE(sk);
674 /* Note that an ENOMEM error is charged twice */
676 UDP6_INC_STATS(sock_net(sk),
677 UDP_MIB_RCVBUFERRORS, is_udplite);
679 UDP6_INC_STATS(sock_net(sk),
680 UDP_MIB_MEMERRORS, is_udplite);
681 UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
689 static __inline__ int udpv6_err(struct sk_buff *skb,
690 struct inet6_skb_parm *opt, u8 type,
691 u8 code, int offset, __be32 info)
693 return __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table);
696 static int udpv6_queue_rcv_one_skb(struct sock *sk, struct sk_buff *skb)
698 struct udp_sock *up = udp_sk(sk);
699 int is_udplite = IS_UDPLITE(sk);
701 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
704 if (static_branch_unlikely(&udpv6_encap_needed_key) && up->encap_type) {
705 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
708 * This is an encapsulation socket so pass the skb to
709 * the socket's udp_encap_rcv() hook. Otherwise, just
710 * fall through and pass this up the UDP socket.
711 * up->encap_rcv() returns the following value:
712 * =0 if skb was successfully passed to the encap
713 * handler or was discarded by it.
714 * >0 if skb should be passed on to UDP.
715 * <0 if skb should be resubmitted as proto -N
718 /* if we're overly short, let UDP handle it */
719 encap_rcv = READ_ONCE(up->encap_rcv);
723 /* Verify checksum before giving to encap */
724 if (udp_lib_checksum_complete(skb))
727 ret = encap_rcv(sk, skb);
729 __UDP_INC_STATS(sock_net(sk),
736 /* FALLTHROUGH -- it's a UDP Packet */
740 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
742 if ((up->pcflag & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
744 if (up->pcrlen == 0) { /* full coverage was set */
745 net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n",
746 UDP_SKB_CB(skb)->cscov, skb->len);
749 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
750 net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n",
751 UDP_SKB_CB(skb)->cscov, up->pcrlen);
756 prefetch(&sk->sk_rmem_alloc);
757 if (rcu_access_pointer(sk->sk_filter) &&
758 udp_lib_checksum_complete(skb))
761 if (sk_filter_trim_cap(sk, skb, sizeof(struct udphdr)))
764 udp_csum_pull_header(skb);
768 return __udpv6_queue_rcv_skb(sk, skb);
771 __UDP6_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite);
773 __UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
774 atomic_inc(&sk->sk_drops);
779 static int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
781 struct sk_buff *next, *segs;
784 if (likely(!udp_unexpected_gso(sk, skb)))
785 return udpv6_queue_rcv_one_skb(sk, skb);
787 __skb_push(skb, -skb_mac_offset(skb));
788 segs = udp_rcv_segment(sk, skb, false);
789 skb_list_walk_safe(segs, skb, next) {
790 __skb_pull(skb, skb_transport_offset(skb));
792 udp_post_segment_fix_csum(skb);
793 ret = udpv6_queue_rcv_one_skb(sk, skb);
795 ip6_protocol_deliver_rcu(dev_net(skb->dev), skb, ret,
801 static bool __udp_v6_is_mcast_sock(struct net *net, struct sock *sk,
802 __be16 loc_port, const struct in6_addr *loc_addr,
803 __be16 rmt_port, const struct in6_addr *rmt_addr,
804 int dif, int sdif, unsigned short hnum)
806 struct inet_sock *inet = inet_sk(sk);
808 if (!net_eq(sock_net(sk), net))
811 if (udp_sk(sk)->udp_port_hash != hnum ||
812 sk->sk_family != PF_INET6 ||
813 (inet->inet_dport && inet->inet_dport != rmt_port) ||
814 (!ipv6_addr_any(&sk->sk_v6_daddr) &&
815 !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) ||
816 !udp_sk_bound_dev_eq(net, sk->sk_bound_dev_if, dif, sdif) ||
817 (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) &&
818 !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr)))
820 if (!inet6_mc_check(sk, loc_addr, rmt_addr))
825 static void udp6_csum_zero_error(struct sk_buff *skb)
827 /* RFC 2460 section 8.1 says that we SHOULD log
828 * this error. Well, it is reasonable.
830 net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n",
831 &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source),
832 &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest));
836 * Note: called only from the BH handler context,
837 * so we don't need to lock the hashes.
839 static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
840 const struct in6_addr *saddr, const struct in6_addr *daddr,
841 struct udp_table *udptable, int proto)
843 struct sock *sk, *first = NULL;
844 const struct udphdr *uh = udp_hdr(skb);
845 unsigned short hnum = ntohs(uh->dest);
846 struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum);
847 unsigned int offset = offsetof(typeof(*sk), sk_node);
848 unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10);
849 int dif = inet6_iif(skb);
850 int sdif = inet6_sdif(skb);
851 struct hlist_node *node;
852 struct sk_buff *nskb;
855 hash2_any = ipv6_portaddr_hash(net, &in6addr_any, hnum) &
857 hash2 = ipv6_portaddr_hash(net, daddr, hnum) & udptable->mask;
859 hslot = &udptable->hash2[hash2];
860 offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node);
863 sk_for_each_entry_offset_rcu(sk, node, &hslot->head, offset) {
864 if (!__udp_v6_is_mcast_sock(net, sk, uh->dest, daddr,
865 uh->source, saddr, dif, sdif,
868 /* If zero checksum and no_check is not on for
869 * the socket then skip it.
871 if (!uh->check && !udp_sk(sk)->no_check6_rx)
877 nskb = skb_clone(skb, GFP_ATOMIC);
878 if (unlikely(!nskb)) {
879 atomic_inc(&sk->sk_drops);
880 __UDP6_INC_STATS(net, UDP_MIB_RCVBUFERRORS,
882 __UDP6_INC_STATS(net, UDP_MIB_INERRORS,
887 if (udpv6_queue_rcv_skb(sk, nskb) > 0)
891 /* Also lookup *:port if we are using hash2 and haven't done so yet. */
892 if (use_hash2 && hash2 != hash2_any) {
898 if (udpv6_queue_rcv_skb(first, skb) > 0)
902 __UDP6_INC_STATS(net, UDP_MIB_IGNOREDMULTI,
903 proto == IPPROTO_UDPLITE);
908 static void udp6_sk_rx_dst_set(struct sock *sk, struct dst_entry *dst)
910 if (udp_sk_rx_dst_set(sk, dst)) {
911 const struct rt6_info *rt = (const struct rt6_info *)dst;
913 sk->sk_rx_dst_cookie = rt6_get_cookie(rt);
917 /* wrapper for udp_queue_rcv_skb tacking care of csum conversion and
918 * return code conversion for ip layer consumption
920 static int udp6_unicast_rcv_skb(struct sock *sk, struct sk_buff *skb,
925 if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk))
926 skb_checksum_try_convert(skb, IPPROTO_UDP, ip6_compute_pseudo);
928 ret = udpv6_queue_rcv_skb(sk, skb);
930 /* a return value > 0 means to resubmit the input */
936 int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
939 enum skb_drop_reason reason = SKB_DROP_REASON_NOT_SPECIFIED;
940 const struct in6_addr *saddr, *daddr;
941 struct net *net = dev_net(skb->dev);
947 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
950 saddr = &ipv6_hdr(skb)->saddr;
951 daddr = &ipv6_hdr(skb)->daddr;
954 ulen = ntohs(uh->len);
958 if (proto == IPPROTO_UDP) {
959 /* UDP validates ulen. */
961 /* Check for jumbo payload */
965 if (ulen < sizeof(*uh))
968 if (ulen < skb->len) {
969 if (pskb_trim_rcsum(skb, ulen))
971 saddr = &ipv6_hdr(skb)->saddr;
972 daddr = &ipv6_hdr(skb)->daddr;
977 if (udp6_csum_init(skb, uh, proto))
980 /* Check if the socket is already available, e.g. due to early demux */
981 sk = skb_steal_sock(skb, &refcounted);
983 struct dst_entry *dst = skb_dst(skb);
986 if (unlikely(rcu_dereference(sk->sk_rx_dst) != dst))
987 udp6_sk_rx_dst_set(sk, dst);
989 if (!uh->check && !udp_sk(sk)->no_check6_rx) {
992 goto report_csum_error;
995 ret = udp6_unicast_rcv_skb(sk, skb, uh);
1002 * Multicast receive code
1004 if (ipv6_addr_is_multicast(daddr))
1005 return __udp6_lib_mcast_deliver(net, skb,
1006 saddr, daddr, udptable, proto);
1009 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
1011 if (!uh->check && !udp_sk(sk)->no_check6_rx)
1012 goto report_csum_error;
1013 return udp6_unicast_rcv_skb(sk, skb, uh);
1016 reason = SKB_DROP_REASON_NO_SOCKET;
1019 goto report_csum_error;
1021 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
1024 if (udp_lib_checksum_complete(skb))
1027 __UDP6_INC_STATS(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
1028 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
1030 kfree_skb_reason(skb, reason);
1034 if (reason == SKB_DROP_REASON_NOT_SPECIFIED)
1035 reason = SKB_DROP_REASON_PKT_TOO_SMALL;
1036 net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n",
1037 proto == IPPROTO_UDPLITE ? "-Lite" : "",
1038 saddr, ntohs(uh->source),
1040 daddr, ntohs(uh->dest));
1044 udp6_csum_zero_error(skb);
1046 if (reason == SKB_DROP_REASON_NOT_SPECIFIED)
1047 reason = SKB_DROP_REASON_UDP_CSUM;
1048 __UDP6_INC_STATS(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE);
1050 __UDP6_INC_STATS(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
1051 kfree_skb_reason(skb, reason);
1056 static struct sock *__udp6_lib_demux_lookup(struct net *net,
1057 __be16 loc_port, const struct in6_addr *loc_addr,
1058 __be16 rmt_port, const struct in6_addr *rmt_addr,
1061 unsigned short hnum = ntohs(loc_port);
1062 unsigned int hash2 = ipv6_portaddr_hash(net, loc_addr, hnum);
1063 unsigned int slot2 = hash2 & udp_table.mask;
1064 struct udp_hslot *hslot2 = &udp_table.hash2[slot2];
1065 const __portpair ports = INET_COMBINED_PORTS(rmt_port, hnum);
1068 udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) {
1069 if (sk->sk_state == TCP_ESTABLISHED &&
1070 inet6_match(net, sk, rmt_addr, loc_addr, ports, dif, sdif))
1072 /* Only check first socket in chain */
1078 void udp_v6_early_demux(struct sk_buff *skb)
1080 struct net *net = dev_net(skb->dev);
1081 const struct udphdr *uh;
1083 struct dst_entry *dst;
1084 int dif = skb->dev->ifindex;
1085 int sdif = inet6_sdif(skb);
1087 if (!pskb_may_pull(skb, skb_transport_offset(skb) +
1088 sizeof(struct udphdr)))
1093 if (skb->pkt_type == PACKET_HOST)
1094 sk = __udp6_lib_demux_lookup(net, uh->dest,
1095 &ipv6_hdr(skb)->daddr,
1096 uh->source, &ipv6_hdr(skb)->saddr,
1101 if (!sk || !refcount_inc_not_zero(&sk->sk_refcnt))
1105 skb->destructor = sock_efree;
1106 dst = rcu_dereference(sk->sk_rx_dst);
1109 dst = dst_check(dst, sk->sk_rx_dst_cookie);
1111 /* set noref for now.
1112 * any place which wants to hold dst has to call
1115 skb_dst_set_noref(skb, dst);
1119 INDIRECT_CALLABLE_SCOPE int udpv6_rcv(struct sk_buff *skb)
1121 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP);
1125 * Throw away all pending data and cancel the corking. Socket is locked.
1127 static void udp_v6_flush_pending_frames(struct sock *sk)
1129 struct udp_sock *up = udp_sk(sk);
1131 if (up->pending == AF_INET)
1132 udp_flush_pending_frames(sk);
1133 else if (up->pending) {
1136 ip6_flush_pending_frames(sk);
1140 static int udpv6_pre_connect(struct sock *sk, struct sockaddr *uaddr,
1143 if (addr_len < offsetofend(struct sockaddr, sa_family))
1145 /* The following checks are replicated from __ip6_datagram_connect()
1146 * and intended to prevent BPF program called below from accessing
1147 * bytes that are out of the bound specified by user in addr_len.
1149 if (uaddr->sa_family == AF_INET) {
1150 if (__ipv6_only_sock(sk))
1151 return -EAFNOSUPPORT;
1152 return udp_pre_connect(sk, uaddr, addr_len);
1155 if (addr_len < SIN6_LEN_RFC2133)
1158 return BPF_CGROUP_RUN_PROG_INET6_CONNECT_LOCK(sk, uaddr);
1162 * udp6_hwcsum_outgoing - handle outgoing HW checksumming
1163 * @sk: socket we are sending on
1164 * @skb: sk_buff containing the filled-in UDP header
1165 * (checksum field must be zeroed out)
1166 * @saddr: source address
1167 * @daddr: destination address
1168 * @len: length of packet
1170 static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
1171 const struct in6_addr *saddr,
1172 const struct in6_addr *daddr, int len)
1174 unsigned int offset;
1175 struct udphdr *uh = udp_hdr(skb);
1176 struct sk_buff *frags = skb_shinfo(skb)->frag_list;
1180 /* Only one fragment on the socket. */
1181 skb->csum_start = skb_transport_header(skb) - skb->head;
1182 skb->csum_offset = offsetof(struct udphdr, check);
1183 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0);
1186 * HW-checksum won't work as there are two or more
1187 * fragments on the socket so that all csums of sk_buffs
1188 * should be together
1190 offset = skb_transport_offset(skb);
1191 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
1194 skb->ip_summed = CHECKSUM_NONE;
1197 csum = csum_add(csum, frags->csum);
1198 } while ((frags = frags->next));
1200 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP,
1203 uh->check = CSUM_MANGLED_0;
1211 static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6,
1212 struct inet_cork *cork)
1214 struct sock *sk = skb->sk;
1217 int is_udplite = IS_UDPLITE(sk);
1219 int offset = skb_transport_offset(skb);
1220 int len = skb->len - offset;
1221 int datalen = len - sizeof(*uh);
1224 * Create a UDP header
1227 uh->source = fl6->fl6_sport;
1228 uh->dest = fl6->fl6_dport;
1229 uh->len = htons(len);
1232 if (cork->gso_size) {
1233 const int hlen = skb_network_header_len(skb) +
1234 sizeof(struct udphdr);
1236 if (hlen + cork->gso_size > cork->fragsize) {
1240 if (datalen > cork->gso_size * UDP_MAX_SEGMENTS) {
1244 if (udp_sk(sk)->no_check6_tx) {
1248 if (skb->ip_summed != CHECKSUM_PARTIAL || is_udplite ||
1249 dst_xfrm(skb_dst(skb))) {
1254 if (datalen > cork->gso_size) {
1255 skb_shinfo(skb)->gso_size = cork->gso_size;
1256 skb_shinfo(skb)->gso_type = SKB_GSO_UDP_L4;
1257 skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(datalen,
1264 csum = udplite_csum(skb);
1265 else if (udp_sk(sk)->no_check6_tx) { /* UDP csum disabled */
1266 skb->ip_summed = CHECKSUM_NONE;
1268 } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
1270 udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, len);
1273 csum = udp_csum(skb);
1275 /* add protocol-dependent pseudo-header */
1276 uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
1277 len, fl6->flowi6_proto, csum);
1279 uh->check = CSUM_MANGLED_0;
1282 err = ip6_send_skb(skb);
1284 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) {
1285 UDP6_INC_STATS(sock_net(sk),
1286 UDP_MIB_SNDBUFERRORS, is_udplite);
1290 UDP6_INC_STATS(sock_net(sk),
1291 UDP_MIB_OUTDATAGRAMS, is_udplite);
1296 static int udp_v6_push_pending_frames(struct sock *sk)
1298 struct sk_buff *skb;
1299 struct udp_sock *up = udp_sk(sk);
1303 if (up->pending == AF_INET)
1304 return udp_push_pending_frames(sk);
1306 /* ip6_finish_skb will release the cork, so make a copy of
1309 fl6 = inet_sk(sk)->cork.fl.u.ip6;
1311 skb = ip6_finish_skb(sk);
1315 err = udp_v6_send_skb(skb, &fl6, &inet_sk(sk)->cork.base);
1323 int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
1325 struct ipv6_txoptions opt_space;
1326 struct udp_sock *up = udp_sk(sk);
1327 struct inet_sock *inet = inet_sk(sk);
1328 struct ipv6_pinfo *np = inet6_sk(sk);
1329 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
1330 struct in6_addr *daddr, *final_p, final;
1331 struct ipv6_txoptions *opt = NULL;
1332 struct ipv6_txoptions *opt_to_free = NULL;
1333 struct ip6_flowlabel *flowlabel = NULL;
1335 struct dst_entry *dst;
1336 struct ipcm6_cookie ipc6;
1337 int addr_len = msg->msg_namelen;
1338 bool connected = false;
1340 int corkreq = READ_ONCE(up->corkflag) || msg->msg_flags&MSG_MORE;
1342 int is_udplite = IS_UDPLITE(sk);
1343 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
1346 ipc6.gso_size = READ_ONCE(up->gso_size);
1347 ipc6.sockc.tsflags = sk->sk_tsflags;
1348 ipc6.sockc.mark = sk->sk_mark;
1350 /* destination address check */
1352 if (addr_len < offsetof(struct sockaddr, sa_data))
1355 switch (sin6->sin6_family) {
1357 if (addr_len < SIN6_LEN_RFC2133)
1359 daddr = &sin6->sin6_addr;
1360 if (ipv6_addr_any(daddr) &&
1361 ipv6_addr_v4mapped(&np->saddr))
1362 ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK),
1366 goto do_udp_sendmsg;
1368 msg->msg_name = sin6 = NULL;
1369 msg->msg_namelen = addr_len = 0;
1375 } else if (!up->pending) {
1376 if (sk->sk_state != TCP_ESTABLISHED)
1377 return -EDESTADDRREQ;
1378 daddr = &sk->sk_v6_daddr;
1383 if (ipv6_addr_v4mapped(daddr)) {
1384 struct sockaddr_in sin;
1385 sin.sin_family = AF_INET;
1386 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport;
1387 sin.sin_addr.s_addr = daddr->s6_addr32[3];
1388 msg->msg_name = &sin;
1389 msg->msg_namelen = sizeof(sin);
1391 err = __ipv6_only_sock(sk) ?
1392 -ENETUNREACH : udp_sendmsg(sk, msg, len);
1393 msg->msg_name = sin6;
1394 msg->msg_namelen = addr_len;
1399 if (up->pending == AF_INET)
1400 return udp_sendmsg(sk, msg, len);
1402 /* Rough check on arithmetic overflow,
1403 better check is made in ip6_append_data().
1405 if (len > INT_MAX - sizeof(struct udphdr))
1408 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
1411 * There are pending frames.
1412 * The socket lock must be held while it's corked.
1415 if (likely(up->pending)) {
1416 if (unlikely(up->pending != AF_INET6)) {
1418 return -EAFNOSUPPORT;
1421 goto do_append_data;
1425 ulen += sizeof(struct udphdr);
1427 memset(&fl6, 0, sizeof(fl6));
1430 if (sin6->sin6_port == 0)
1433 fl6.fl6_dport = sin6->sin6_port;
1434 daddr = &sin6->sin6_addr;
1437 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
1438 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
1439 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1440 if (IS_ERR(flowlabel))
1446 * Otherwise it will be difficult to maintain
1449 if (sk->sk_state == TCP_ESTABLISHED &&
1450 ipv6_addr_equal(daddr, &sk->sk_v6_daddr))
1451 daddr = &sk->sk_v6_daddr;
1453 if (addr_len >= sizeof(struct sockaddr_in6) &&
1454 sin6->sin6_scope_id &&
1455 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
1456 fl6.flowi6_oif = sin6->sin6_scope_id;
1458 if (sk->sk_state != TCP_ESTABLISHED)
1459 return -EDESTADDRREQ;
1461 fl6.fl6_dport = inet->inet_dport;
1462 daddr = &sk->sk_v6_daddr;
1463 fl6.flowlabel = np->flow_label;
1467 if (!fl6.flowi6_oif)
1468 fl6.flowi6_oif = sk->sk_bound_dev_if;
1470 if (!fl6.flowi6_oif)
1471 fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex;
1473 fl6.flowi6_uid = sk->sk_uid;
1475 if (msg->msg_controllen) {
1477 memset(opt, 0, sizeof(struct ipv6_txoptions));
1478 opt->tot_len = sizeof(*opt);
1481 err = udp_cmsg_send(sk, msg, &ipc6.gso_size);
1483 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6,
1486 fl6_sock_release(flowlabel);
1489 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
1490 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1491 if (IS_ERR(flowlabel))
1494 if (!(opt->opt_nflen|opt->opt_flen))
1499 opt = txopt_get(np);
1503 opt = fl6_merge_options(&opt_space, flowlabel, opt);
1504 opt = ipv6_fixup_options(&opt_space, opt);
1507 fl6.flowi6_proto = sk->sk_protocol;
1508 fl6.flowi6_mark = ipc6.sockc.mark;
1510 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
1511 fl6.saddr = np->saddr;
1512 fl6.fl6_sport = inet->inet_sport;
1514 if (cgroup_bpf_enabled(CGROUP_UDP6_SENDMSG) && !connected) {
1515 err = BPF_CGROUP_RUN_PROG_UDP6_SENDMSG_LOCK(sk,
1516 (struct sockaddr *)sin6, &fl6.saddr);
1520 if (ipv6_addr_v4mapped(&sin6->sin6_addr)) {
1521 /* BPF program rewrote IPv6-only by IPv4-mapped
1522 * IPv6. It's currently unsupported.
1527 if (sin6->sin6_port == 0) {
1528 /* BPF program set invalid port. Reject it. */
1532 fl6.fl6_dport = sin6->sin6_port;
1533 fl6.daddr = sin6->sin6_addr;
1537 if (ipv6_addr_any(&fl6.daddr))
1538 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
1540 final_p = fl6_update_dst(&fl6, opt, &final);
1544 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) {
1545 fl6.flowi6_oif = np->mcast_oif;
1547 } else if (!fl6.flowi6_oif)
1548 fl6.flowi6_oif = np->ucast_oif;
1550 security_sk_classify_flow(sk, flowi6_to_flowi_common(&fl6));
1552 if (ipc6.tclass < 0)
1553 ipc6.tclass = np->tclass;
1555 fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel);
1557 dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p, connected);
1564 if (ipc6.hlimit < 0)
1565 ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
1567 if (msg->msg_flags&MSG_CONFIRM)
1571 /* Lockless fast path for the non-corking case */
1573 struct inet_cork_full cork;
1574 struct sk_buff *skb;
1576 skb = ip6_make_skb(sk, getfrag, msg, ulen,
1577 sizeof(struct udphdr), &ipc6,
1578 &fl6, (struct rt6_info *)dst,
1579 msg->msg_flags, &cork);
1581 if (!IS_ERR_OR_NULL(skb))
1582 err = udp_v6_send_skb(skb, &fl6, &cork.base);
1587 if (unlikely(up->pending)) {
1588 /* The socket is already corked while preparing it. */
1589 /* ... which is an evident application bug. --ANK */
1592 net_dbg_ratelimited("udp cork app bug 2\n");
1597 up->pending = AF_INET6;
1600 if (ipc6.dontfrag < 0)
1601 ipc6.dontfrag = np->dontfrag;
1603 err = ip6_append_data(sk, getfrag, msg, ulen, sizeof(struct udphdr),
1604 &ipc6, &fl6, (struct rt6_info *)dst,
1605 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
1607 udp_v6_flush_pending_frames(sk);
1609 err = udp_v6_push_pending_frames(sk);
1610 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
1614 err = np->recverr ? net_xmit_errno(err) : 0;
1620 fl6_sock_release(flowlabel);
1621 txopt_put(opt_to_free);
1625 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
1626 * ENOBUFS might not be good (it's not tunable per se), but otherwise
1627 * we don't have a good statistic (IpOutDiscards but it can be too many
1628 * things). We could add another new stat but at least for now that
1629 * seems like overkill.
1631 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
1632 UDP6_INC_STATS(sock_net(sk),
1633 UDP_MIB_SNDBUFERRORS, is_udplite);
1638 if (msg->msg_flags & MSG_PROBE)
1639 dst_confirm_neigh(dst, &fl6.daddr);
1640 if (!(msg->msg_flags&MSG_PROBE) || len)
1641 goto back_from_confirm;
1646 void udpv6_destroy_sock(struct sock *sk)
1648 struct udp_sock *up = udp_sk(sk);
1651 /* protects from races with udp_abort() */
1652 sock_set_flag(sk, SOCK_DEAD);
1653 udp_v6_flush_pending_frames(sk);
1656 if (static_branch_unlikely(&udpv6_encap_needed_key)) {
1657 if (up->encap_type) {
1658 void (*encap_destroy)(struct sock *sk);
1659 encap_destroy = READ_ONCE(up->encap_destroy);
1663 if (up->encap_enabled) {
1664 static_branch_dec(&udpv6_encap_needed_key);
1665 udp_encap_disable();
1671 * Socket option code for UDP
1673 int udpv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
1674 unsigned int optlen)
1676 if (level == SOL_UDP || level == SOL_UDPLITE)
1677 return udp_lib_setsockopt(sk, level, optname,
1679 udp_v6_push_pending_frames);
1680 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1683 int udpv6_getsockopt(struct sock *sk, int level, int optname,
1684 char __user *optval, int __user *optlen)
1686 if (level == SOL_UDP || level == SOL_UDPLITE)
1687 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1688 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1691 static const struct inet6_protocol udpv6_protocol = {
1692 .handler = udpv6_rcv,
1693 .err_handler = udpv6_err,
1694 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1697 /* ------------------------------------------------------------------------ */
1698 #ifdef CONFIG_PROC_FS
1699 int udp6_seq_show(struct seq_file *seq, void *v)
1701 if (v == SEQ_START_TOKEN) {
1702 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
1704 int bucket = ((struct udp_iter_state *)seq->private)->bucket;
1705 struct inet_sock *inet = inet_sk(v);
1706 __u16 srcp = ntohs(inet->inet_sport);
1707 __u16 destp = ntohs(inet->inet_dport);
1708 __ip6_dgram_sock_seq_show(seq, v, srcp, destp,
1709 udp_rqueue_get(v), bucket);
1714 const struct seq_operations udp6_seq_ops = {
1715 .start = udp_seq_start,
1716 .next = udp_seq_next,
1717 .stop = udp_seq_stop,
1718 .show = udp6_seq_show,
1720 EXPORT_SYMBOL(udp6_seq_ops);
1722 static struct udp_seq_afinfo udp6_seq_afinfo = {
1724 .udp_table = &udp_table,
1727 int __net_init udp6_proc_init(struct net *net)
1729 if (!proc_create_net_data("udp6", 0444, net->proc_net, &udp6_seq_ops,
1730 sizeof(struct udp_iter_state), &udp6_seq_afinfo))
1735 void udp6_proc_exit(struct net *net)
1737 remove_proc_entry("udp6", net->proc_net);
1739 #endif /* CONFIG_PROC_FS */
1741 /* ------------------------------------------------------------------------ */
1743 struct proto udpv6_prot = {
1745 .owner = THIS_MODULE,
1746 .close = udp_lib_close,
1747 .pre_connect = udpv6_pre_connect,
1748 .connect = ip6_datagram_connect,
1749 .disconnect = udp_disconnect,
1751 .init = udpv6_init_sock,
1752 .destroy = udpv6_destroy_sock,
1753 .setsockopt = udpv6_setsockopt,
1754 .getsockopt = udpv6_getsockopt,
1755 .sendmsg = udpv6_sendmsg,
1756 .recvmsg = udpv6_recvmsg,
1757 .release_cb = ip6_datagram_release_cb,
1758 .hash = udp_lib_hash,
1759 .unhash = udp_lib_unhash,
1760 .rehash = udp_v6_rehash,
1761 .get_port = udp_v6_get_port,
1762 #ifdef CONFIG_BPF_SYSCALL
1763 .psock_update_sk_prot = udp_bpf_update_proto,
1765 .memory_allocated = &udp_memory_allocated,
1766 .sysctl_mem = sysctl_udp_mem,
1767 .sysctl_wmem_offset = offsetof(struct net, ipv4.sysctl_udp_wmem_min),
1768 .sysctl_rmem_offset = offsetof(struct net, ipv4.sysctl_udp_rmem_min),
1769 .obj_size = sizeof(struct udp6_sock),
1770 .h.udp_table = &udp_table,
1771 .diag_destroy = udp_abort,
1774 static struct inet_protosw udpv6_protosw = {
1776 .protocol = IPPROTO_UDP,
1777 .prot = &udpv6_prot,
1778 .ops = &inet6_dgram_ops,
1779 .flags = INET_PROTOSW_PERMANENT,
1782 int __init udpv6_init(void)
1786 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
1790 ret = inet6_register_protosw(&udpv6_protosw);
1792 goto out_udpv6_protocol;
1797 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1801 void udpv6_exit(void)
1803 inet6_unregister_protosw(&udpv6_protosw);
1804 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);