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>
43 #include <net/tcp_states.h>
44 #include <net/ip6_checksum.h>
45 #include <net/ip6_tunnel.h>
47 #include <net/inet_hashtables.h>
48 #include <net/inet6_hashtables.h>
49 #include <net/busy_poll.h>
50 #include <net/sock_reuseport.h>
52 #include <linux/proc_fs.h>
53 #include <linux/seq_file.h>
54 #include <trace/events/skb.h>
57 static u32
udp6_ehashfn(const struct net
*net
,
58 const struct in6_addr
*laddr
,
60 const struct in6_addr
*faddr
,
63 static u32 udp6_ehash_secret __read_mostly
;
64 static u32 udp_ipv6_hash_secret __read_mostly
;
68 net_get_random_once(&udp6_ehash_secret
,
69 sizeof(udp6_ehash_secret
));
70 net_get_random_once(&udp_ipv6_hash_secret
,
71 sizeof(udp_ipv6_hash_secret
));
73 lhash
= (__force u32
)laddr
->s6_addr32
[3];
74 fhash
= __ipv6_addr_jhash(faddr
, udp_ipv6_hash_secret
);
76 return __inet6_ehashfn(lhash
, lport
, fhash
, fport
,
77 udp_ipv6_hash_secret
+ net_hash_mix(net
));
80 int udp_v6_get_port(struct sock
*sk
, unsigned short snum
)
82 unsigned int hash2_nulladdr
=
83 ipv6_portaddr_hash(sock_net(sk
), &in6addr_any
, snum
);
84 unsigned int hash2_partial
=
85 ipv6_portaddr_hash(sock_net(sk
), &sk
->sk_v6_rcv_saddr
, 0);
87 /* precompute partial secondary hash */
88 udp_sk(sk
)->udp_portaddr_hash
= hash2_partial
;
89 return udp_lib_get_port(sk
, snum
, hash2_nulladdr
);
92 void udp_v6_rehash(struct sock
*sk
)
94 u16 new_hash
= ipv6_portaddr_hash(sock_net(sk
),
96 inet_sk(sk
)->inet_num
);
98 udp_lib_rehash(sk
, new_hash
);
101 static int compute_score(struct sock
*sk
, struct net
*net
,
102 const struct in6_addr
*saddr
, __be16 sport
,
103 const struct in6_addr
*daddr
, unsigned short hnum
,
107 struct inet_sock
*inet
;
110 if (!net_eq(sock_net(sk
), net
) ||
111 udp_sk(sk
)->udp_port_hash
!= hnum
||
112 sk
->sk_family
!= PF_INET6
)
115 if (!ipv6_addr_equal(&sk
->sk_v6_rcv_saddr
, daddr
))
121 if (inet
->inet_dport
) {
122 if (inet
->inet_dport
!= sport
)
127 if (!ipv6_addr_any(&sk
->sk_v6_daddr
)) {
128 if (!ipv6_addr_equal(&sk
->sk_v6_daddr
, saddr
))
133 dev_match
= udp_sk_bound_dev_eq(net
, sk
->sk_bound_dev_if
, dif
, sdif
);
138 if (READ_ONCE(sk
->sk_incoming_cpu
) == raw_smp_processor_id())
144 static struct sock
*lookup_reuseport(struct net
*net
, struct sock
*sk
,
146 const struct in6_addr
*saddr
,
148 const struct in6_addr
*daddr
,
151 struct sock
*reuse_sk
= NULL
;
154 if (sk
->sk_reuseport
&& sk
->sk_state
!= TCP_ESTABLISHED
) {
155 hash
= udp6_ehashfn(net
, daddr
, hnum
, saddr
, sport
);
156 reuse_sk
= reuseport_select_sock(sk
, hash
, skb
,
157 sizeof(struct udphdr
));
162 /* called with rcu_read_lock() */
163 static struct sock
*udp6_lib_lookup2(struct net
*net
,
164 const struct in6_addr
*saddr
, __be16 sport
,
165 const struct in6_addr
*daddr
, unsigned int hnum
,
166 int dif
, int sdif
, struct udp_hslot
*hslot2
,
169 struct sock
*sk
, *result
;
174 udp_portaddr_for_each_entry_rcu(sk
, &hslot2
->head
) {
175 score
= compute_score(sk
, net
, saddr
, sport
,
176 daddr
, hnum
, dif
, sdif
);
177 if (score
> badness
) {
178 result
= lookup_reuseport(net
, sk
, skb
,
179 saddr
, sport
, daddr
, hnum
);
180 /* Fall back to scoring if group has connections */
181 if (result
&& !reuseport_has_conns(sk
, false))
184 result
= result
? : sk
;
191 static inline struct sock
*udp6_lookup_run_bpf(struct net
*net
,
192 struct udp_table
*udptable
,
194 const struct in6_addr
*saddr
,
196 const struct in6_addr
*daddr
,
199 struct sock
*sk
, *reuse_sk
;
202 if (udptable
!= &udp_table
)
203 return NULL
; /* only UDP is supported */
205 no_reuseport
= bpf_sk_lookup_run_v6(net
, IPPROTO_UDP
,
206 saddr
, sport
, daddr
, hnum
, &sk
);
207 if (no_reuseport
|| IS_ERR_OR_NULL(sk
))
210 reuse_sk
= lookup_reuseport(net
, sk
, skb
, saddr
, sport
, daddr
, hnum
);
216 /* rcu_read_lock() must be held */
217 struct sock
*__udp6_lib_lookup(struct net
*net
,
218 const struct in6_addr
*saddr
, __be16 sport
,
219 const struct in6_addr
*daddr
, __be16 dport
,
220 int dif
, int sdif
, struct udp_table
*udptable
,
223 unsigned short hnum
= ntohs(dport
);
224 unsigned int hash2
, slot2
;
225 struct udp_hslot
*hslot2
;
226 struct sock
*result
, *sk
;
228 hash2
= ipv6_portaddr_hash(net
, daddr
, hnum
);
229 slot2
= hash2
& udptable
->mask
;
230 hslot2
= &udptable
->hash2
[slot2
];
232 /* Lookup connected or non-wildcard sockets */
233 result
= udp6_lib_lookup2(net
, saddr
, sport
,
234 daddr
, hnum
, dif
, sdif
,
236 if (!IS_ERR_OR_NULL(result
) && result
->sk_state
== TCP_ESTABLISHED
)
239 /* Lookup redirect from BPF */
240 if (static_branch_unlikely(&bpf_sk_lookup_enabled
)) {
241 sk
= udp6_lookup_run_bpf(net
, udptable
, skb
,
242 saddr
, sport
, daddr
, hnum
);
249 /* Got non-wildcard socket or error on first lookup */
253 /* Lookup wildcard sockets */
254 hash2
= ipv6_portaddr_hash(net
, &in6addr_any
, hnum
);
255 slot2
= hash2
& udptable
->mask
;
256 hslot2
= &udptable
->hash2
[slot2
];
258 result
= udp6_lib_lookup2(net
, saddr
, sport
,
259 &in6addr_any
, hnum
, dif
, sdif
,
266 EXPORT_SYMBOL_GPL(__udp6_lib_lookup
);
268 static struct sock
*__udp6_lib_lookup_skb(struct sk_buff
*skb
,
269 __be16 sport
, __be16 dport
,
270 struct udp_table
*udptable
)
272 const struct ipv6hdr
*iph
= ipv6_hdr(skb
);
274 return __udp6_lib_lookup(dev_net(skb
->dev
), &iph
->saddr
, sport
,
275 &iph
->daddr
, dport
, inet6_iif(skb
),
276 inet6_sdif(skb
), udptable
, skb
);
279 struct sock
*udp6_lib_lookup_skb(const struct sk_buff
*skb
,
280 __be16 sport
, __be16 dport
)
282 const struct ipv6hdr
*iph
= ipv6_hdr(skb
);
284 return __udp6_lib_lookup(dev_net(skb
->dev
), &iph
->saddr
, sport
,
285 &iph
->daddr
, dport
, inet6_iif(skb
),
286 inet6_sdif(skb
), &udp_table
, NULL
);
289 /* Must be called under rcu_read_lock().
290 * Does increment socket refcount.
292 #if IS_ENABLED(CONFIG_NF_TPROXY_IPV6) || IS_ENABLED(CONFIG_NF_SOCKET_IPV6)
293 struct sock
*udp6_lib_lookup(struct net
*net
, const struct in6_addr
*saddr
, __be16 sport
,
294 const struct in6_addr
*daddr
, __be16 dport
, int dif
)
298 sk
= __udp6_lib_lookup(net
, saddr
, sport
, daddr
, dport
,
299 dif
, 0, &udp_table
, NULL
);
300 if (sk
&& !refcount_inc_not_zero(&sk
->sk_refcnt
))
304 EXPORT_SYMBOL_GPL(udp6_lib_lookup
);
307 /* do not use the scratch area len for jumbogram: their length execeeds the
308 * scratch area space; note that the IP6CB flags is still in the first
309 * cacheline, so checking for jumbograms is cheap
311 static int udp6_skb_len(struct sk_buff
*skb
)
313 return unlikely(inet6_is_jumbogram(skb
)) ? skb
->len
: udp_skb_len(skb
);
317 * This should be easy, if there is something there we
318 * return it, otherwise we block.
321 int udpv6_recvmsg(struct sock
*sk
, struct msghdr
*msg
, size_t len
,
322 int noblock
, int flags
, int *addr_len
)
324 struct ipv6_pinfo
*np
= inet6_sk(sk
);
325 struct inet_sock
*inet
= inet_sk(sk
);
327 unsigned int ulen
, copied
;
328 int off
, err
, peeking
= flags
& MSG_PEEK
;
329 int is_udplite
= IS_UDPLITE(sk
);
330 struct udp_mib __percpu
*mib
;
331 bool checksum_valid
= false;
334 if (flags
& MSG_ERRQUEUE
)
335 return ipv6_recv_error(sk
, msg
, len
, addr_len
);
337 if (np
->rxpmtu
&& np
->rxopt
.bits
.rxpmtu
)
338 return ipv6_recv_rxpmtu(sk
, msg
, len
, addr_len
);
341 off
= sk_peek_offset(sk
, flags
);
342 skb
= __skb_recv_udp(sk
, flags
, noblock
, &off
, &err
);
346 ulen
= udp6_skb_len(skb
);
348 if (copied
> ulen
- off
)
350 else if (copied
< ulen
)
351 msg
->msg_flags
|= MSG_TRUNC
;
353 is_udp4
= (skb
->protocol
== htons(ETH_P_IP
));
354 mib
= __UDPX_MIB(sk
, is_udp4
);
357 * If checksum is needed at all, try to do it while copying the
358 * data. If the data is truncated, or if we only want a partial
359 * coverage checksum (UDP-Lite), do it before the copy.
362 if (copied
< ulen
|| peeking
||
363 (is_udplite
&& UDP_SKB_CB(skb
)->partial_cov
)) {
364 checksum_valid
= udp_skb_csum_unnecessary(skb
) ||
365 !__udp_lib_checksum_complete(skb
);
370 if (checksum_valid
|| udp_skb_csum_unnecessary(skb
)) {
371 if (udp_skb_is_linear(skb
))
372 err
= copy_linear_skb(skb
, copied
, off
, &msg
->msg_iter
);
374 err
= skb_copy_datagram_msg(skb
, off
, msg
, copied
);
376 err
= skb_copy_and_csum_datagram_msg(skb
, off
, msg
);
382 atomic_inc(&sk
->sk_drops
);
383 SNMP_INC_STATS(mib
, UDP_MIB_INERRORS
);
389 SNMP_INC_STATS(mib
, UDP_MIB_INDATAGRAMS
);
391 sock_recv_ts_and_drops(msg
, sk
, skb
);
393 /* Copy the address. */
395 DECLARE_SOCKADDR(struct sockaddr_in6
*, sin6
, msg
->msg_name
);
396 sin6
->sin6_family
= AF_INET6
;
397 sin6
->sin6_port
= udp_hdr(skb
)->source
;
398 sin6
->sin6_flowinfo
= 0;
401 ipv6_addr_set_v4mapped(ip_hdr(skb
)->saddr
,
403 sin6
->sin6_scope_id
= 0;
405 sin6
->sin6_addr
= ipv6_hdr(skb
)->saddr
;
406 sin6
->sin6_scope_id
=
407 ipv6_iface_scope_id(&sin6
->sin6_addr
,
410 *addr_len
= sizeof(*sin6
);
412 BPF_CGROUP_RUN_PROG_UDP6_RECVMSG_LOCK(sk
,
413 (struct sockaddr
*)sin6
);
416 if (udp_sk(sk
)->gro_enabled
)
417 udp_cmsg_recv(msg
, sk
, skb
);
420 ip6_datagram_recv_common_ctl(sk
, msg
, skb
);
423 if (inet
->cmsg_flags
)
424 ip_cmsg_recv_offset(msg
, sk
, skb
,
425 sizeof(struct udphdr
), off
);
428 ip6_datagram_recv_specific_ctl(sk
, msg
, skb
);
432 if (flags
& MSG_TRUNC
)
435 skb_consume_udp(sk
, skb
, peeking
? -err
: err
);
439 if (!__sk_queue_drop_skb(sk
, &udp_sk(sk
)->reader_queue
, skb
, flags
,
440 udp_skb_destructor
)) {
441 SNMP_INC_STATS(mib
, UDP_MIB_CSUMERRORS
);
442 SNMP_INC_STATS(mib
, UDP_MIB_INERRORS
);
446 /* starting over for a new packet, but check if we need to yield */
448 msg
->msg_flags
&= ~MSG_TRUNC
;
452 DEFINE_STATIC_KEY_FALSE(udpv6_encap_needed_key
);
453 void udpv6_encap_enable(void)
455 static_branch_inc(&udpv6_encap_needed_key
);
457 EXPORT_SYMBOL(udpv6_encap_enable
);
459 /* Handler for tunnels with arbitrary destination ports: no socket lookup, go
460 * through error handlers in encapsulations looking for a match.
462 static int __udp6_lib_err_encap_no_sk(struct sk_buff
*skb
,
463 struct inet6_skb_parm
*opt
,
464 u8 type
, u8 code
, int offset
, __be32 info
)
468 for (i
= 0; i
< MAX_IPTUN_ENCAP_OPS
; i
++) {
469 int (*handler
)(struct sk_buff
*skb
, struct inet6_skb_parm
*opt
,
470 u8 type
, u8 code
, int offset
, __be32 info
);
471 const struct ip6_tnl_encap_ops
*encap
;
473 encap
= rcu_dereference(ip6tun_encaps
[i
]);
476 handler
= encap
->err_handler
;
477 if (handler
&& !handler(skb
, opt
, type
, code
, offset
, info
))
484 /* Try to match ICMP errors to UDP tunnels by looking up a socket without
485 * reversing source and destination port: this will match tunnels that force the
486 * same destination port on both endpoints (e.g. VXLAN, GENEVE). Note that
487 * lwtunnels might actually break this assumption by being configured with
488 * different destination ports on endpoints, in this case we won't be able to
489 * trace ICMP messages back to them.
491 * If this doesn't match any socket, probe tunnels with arbitrary destination
492 * ports (e.g. FoU, GUE): there, the receiving socket is useless, as the port
493 * we've sent packets to won't necessarily match the local destination port.
495 * Then ask the tunnel implementation to match the error against a valid
498 * Return an error if we can't find a match, the socket if we need further
499 * processing, zero otherwise.
501 static struct sock
*__udp6_lib_err_encap(struct net
*net
,
502 const struct ipv6hdr
*hdr
, int offset
,
504 struct udp_table
*udptable
,
507 struct inet6_skb_parm
*opt
,
508 u8 type
, u8 code
, __be32 info
)
510 int (*lookup
)(struct sock
*sk
, struct sk_buff
*skb
);
511 int network_offset
, transport_offset
;
514 network_offset
= skb_network_offset(skb
);
515 transport_offset
= skb_transport_offset(skb
);
517 /* Network header needs to point to the outer IPv6 header inside ICMP */
518 skb_reset_network_header(skb
);
520 /* Transport header needs to point to the UDP header */
521 skb_set_transport_header(skb
, offset
);
526 lookup
= READ_ONCE(up
->encap_err_lookup
);
527 if (lookup
&& lookup(sk
, skb
))
533 sk
= __udp6_lib_lookup(net
, &hdr
->daddr
, uh
->source
,
534 &hdr
->saddr
, uh
->dest
,
535 inet6_iif(skb
), 0, udptable
, skb
);
539 lookup
= READ_ONCE(up
->encap_err_lookup
);
540 if (!lookup
|| lookup(sk
, skb
))
546 sk
= ERR_PTR(__udp6_lib_err_encap_no_sk(skb
, opt
, type
, code
,
550 skb_set_transport_header(skb
, transport_offset
);
551 skb_set_network_header(skb
, network_offset
);
556 int __udp6_lib_err(struct sk_buff
*skb
, struct inet6_skb_parm
*opt
,
557 u8 type
, u8 code
, int offset
, __be32 info
,
558 struct udp_table
*udptable
)
560 struct ipv6_pinfo
*np
;
561 const struct ipv6hdr
*hdr
= (const struct ipv6hdr
*)skb
->data
;
562 const struct in6_addr
*saddr
= &hdr
->saddr
;
563 const struct in6_addr
*daddr
= &hdr
->daddr
;
564 struct udphdr
*uh
= (struct udphdr
*)(skb
->data
+offset
);
569 struct net
*net
= dev_net(skb
->dev
);
571 sk
= __udp6_lib_lookup(net
, daddr
, uh
->dest
, saddr
, uh
->source
,
572 inet6_iif(skb
), inet6_sdif(skb
), udptable
, NULL
);
574 if (!sk
|| udp_sk(sk
)->encap_type
) {
575 /* No socket for error: try tunnels before discarding */
576 if (static_branch_unlikely(&udpv6_encap_needed_key
)) {
577 sk
= __udp6_lib_err_encap(net
, hdr
, offset
, uh
,
579 opt
, type
, code
, info
);
583 sk
= ERR_PTR(-ENOENT
);
586 __ICMP6_INC_STATS(net
, __in6_dev_get(skb
->dev
),
594 harderr
= icmpv6_err_convert(type
, code
, &err
);
597 if (type
== ICMPV6_PKT_TOOBIG
) {
598 if (!ip6_sk_accept_pmtu(sk
))
600 ip6_sk_update_pmtu(skb
, sk
, info
);
601 if (np
->pmtudisc
!= IPV6_PMTUDISC_DONT
)
604 if (type
== NDISC_REDIRECT
) {
606 ip6_redirect(skb
, sock_net(sk
), inet6_iif(skb
),
607 sk
->sk_mark
, sk
->sk_uid
);
609 ip6_sk_redirect(skb
, sk
);
614 /* Tunnels don't have an application socket: don't pass errors back */
619 if (!harderr
|| sk
->sk_state
!= TCP_ESTABLISHED
)
622 ipv6_icmp_error(sk
, skb
, err
, uh
->dest
, ntohl(info
), (u8
*)(uh
+1));
631 static int __udpv6_queue_rcv_skb(struct sock
*sk
, struct sk_buff
*skb
)
635 if (!ipv6_addr_any(&sk
->sk_v6_daddr
)) {
636 sock_rps_save_rxhash(sk
, skb
);
637 sk_mark_napi_id(sk
, skb
);
638 sk_incoming_cpu_update(sk
);
640 sk_mark_napi_id_once(sk
, skb
);
643 rc
= __udp_enqueue_schedule_skb(sk
, skb
);
645 int is_udplite
= IS_UDPLITE(sk
);
647 /* Note that an ENOMEM error is charged twice */
649 UDP6_INC_STATS(sock_net(sk
),
650 UDP_MIB_RCVBUFERRORS
, is_udplite
);
652 UDP6_INC_STATS(sock_net(sk
),
653 UDP_MIB_MEMERRORS
, is_udplite
);
654 UDP6_INC_STATS(sock_net(sk
), UDP_MIB_INERRORS
, is_udplite
);
662 static __inline__
int udpv6_err(struct sk_buff
*skb
,
663 struct inet6_skb_parm
*opt
, u8 type
,
664 u8 code
, int offset
, __be32 info
)
666 return __udp6_lib_err(skb
, opt
, type
, code
, offset
, info
, &udp_table
);
669 static int udpv6_queue_rcv_one_skb(struct sock
*sk
, struct sk_buff
*skb
)
671 struct udp_sock
*up
= udp_sk(sk
);
672 int is_udplite
= IS_UDPLITE(sk
);
674 if (!xfrm6_policy_check(sk
, XFRM_POLICY_IN
, skb
))
677 if (static_branch_unlikely(&udpv6_encap_needed_key
) && up
->encap_type
) {
678 int (*encap_rcv
)(struct sock
*sk
, struct sk_buff
*skb
);
681 * This is an encapsulation socket so pass the skb to
682 * the socket's udp_encap_rcv() hook. Otherwise, just
683 * fall through and pass this up the UDP socket.
684 * up->encap_rcv() returns the following value:
685 * =0 if skb was successfully passed to the encap
686 * handler or was discarded by it.
687 * >0 if skb should be passed on to UDP.
688 * <0 if skb should be resubmitted as proto -N
691 /* if we're overly short, let UDP handle it */
692 encap_rcv
= READ_ONCE(up
->encap_rcv
);
696 /* Verify checksum before giving to encap */
697 if (udp_lib_checksum_complete(skb
))
700 ret
= encap_rcv(sk
, skb
);
702 __UDP_INC_STATS(sock_net(sk
),
709 /* FALLTHROUGH -- it's a UDP Packet */
713 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
715 if ((up
->pcflag
& UDPLITE_RECV_CC
) && UDP_SKB_CB(skb
)->partial_cov
) {
717 if (up
->pcrlen
== 0) { /* full coverage was set */
718 net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n",
719 UDP_SKB_CB(skb
)->cscov
, skb
->len
);
722 if (UDP_SKB_CB(skb
)->cscov
< up
->pcrlen
) {
723 net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n",
724 UDP_SKB_CB(skb
)->cscov
, up
->pcrlen
);
729 prefetch(&sk
->sk_rmem_alloc
);
730 if (rcu_access_pointer(sk
->sk_filter
) &&
731 udp_lib_checksum_complete(skb
))
734 if (sk_filter_trim_cap(sk
, skb
, sizeof(struct udphdr
)))
737 udp_csum_pull_header(skb
);
741 return __udpv6_queue_rcv_skb(sk
, skb
);
744 __UDP6_INC_STATS(sock_net(sk
), UDP_MIB_CSUMERRORS
, is_udplite
);
746 __UDP6_INC_STATS(sock_net(sk
), UDP_MIB_INERRORS
, is_udplite
);
747 atomic_inc(&sk
->sk_drops
);
752 static int udpv6_queue_rcv_skb(struct sock
*sk
, struct sk_buff
*skb
)
754 struct sk_buff
*next
, *segs
;
757 if (likely(!udp_unexpected_gso(sk
, skb
)))
758 return udpv6_queue_rcv_one_skb(sk
, skb
);
760 __skb_push(skb
, -skb_mac_offset(skb
));
761 segs
= udp_rcv_segment(sk
, skb
, false);
762 skb_list_walk_safe(segs
, skb
, next
) {
763 __skb_pull(skb
, skb_transport_offset(skb
));
765 udp_post_segment_fix_csum(skb
);
766 ret
= udpv6_queue_rcv_one_skb(sk
, skb
);
768 ip6_protocol_deliver_rcu(dev_net(skb
->dev
), skb
, ret
,
774 static bool __udp_v6_is_mcast_sock(struct net
*net
, struct sock
*sk
,
775 __be16 loc_port
, const struct in6_addr
*loc_addr
,
776 __be16 rmt_port
, const struct in6_addr
*rmt_addr
,
777 int dif
, int sdif
, unsigned short hnum
)
779 struct inet_sock
*inet
= inet_sk(sk
);
781 if (!net_eq(sock_net(sk
), net
))
784 if (udp_sk(sk
)->udp_port_hash
!= hnum
||
785 sk
->sk_family
!= PF_INET6
||
786 (inet
->inet_dport
&& inet
->inet_dport
!= rmt_port
) ||
787 (!ipv6_addr_any(&sk
->sk_v6_daddr
) &&
788 !ipv6_addr_equal(&sk
->sk_v6_daddr
, rmt_addr
)) ||
789 !udp_sk_bound_dev_eq(net
, sk
->sk_bound_dev_if
, dif
, sdif
) ||
790 (!ipv6_addr_any(&sk
->sk_v6_rcv_saddr
) &&
791 !ipv6_addr_equal(&sk
->sk_v6_rcv_saddr
, loc_addr
)))
793 if (!inet6_mc_check(sk
, loc_addr
, rmt_addr
))
798 static void udp6_csum_zero_error(struct sk_buff
*skb
)
800 /* RFC 2460 section 8.1 says that we SHOULD log
801 * this error. Well, it is reasonable.
803 net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n",
804 &ipv6_hdr(skb
)->saddr
, ntohs(udp_hdr(skb
)->source
),
805 &ipv6_hdr(skb
)->daddr
, ntohs(udp_hdr(skb
)->dest
));
809 * Note: called only from the BH handler context,
810 * so we don't need to lock the hashes.
812 static int __udp6_lib_mcast_deliver(struct net
*net
, struct sk_buff
*skb
,
813 const struct in6_addr
*saddr
, const struct in6_addr
*daddr
,
814 struct udp_table
*udptable
, int proto
)
816 struct sock
*sk
, *first
= NULL
;
817 const struct udphdr
*uh
= udp_hdr(skb
);
818 unsigned short hnum
= ntohs(uh
->dest
);
819 struct udp_hslot
*hslot
= udp_hashslot(udptable
, net
, hnum
);
820 unsigned int offset
= offsetof(typeof(*sk
), sk_node
);
821 unsigned int hash2
= 0, hash2_any
= 0, use_hash2
= (hslot
->count
> 10);
822 int dif
= inet6_iif(skb
);
823 int sdif
= inet6_sdif(skb
);
824 struct hlist_node
*node
;
825 struct sk_buff
*nskb
;
828 hash2_any
= ipv6_portaddr_hash(net
, &in6addr_any
, hnum
) &
830 hash2
= ipv6_portaddr_hash(net
, daddr
, hnum
) & udptable
->mask
;
832 hslot
= &udptable
->hash2
[hash2
];
833 offset
= offsetof(typeof(*sk
), __sk_common
.skc_portaddr_node
);
836 sk_for_each_entry_offset_rcu(sk
, node
, &hslot
->head
, offset
) {
837 if (!__udp_v6_is_mcast_sock(net
, sk
, uh
->dest
, daddr
,
838 uh
->source
, saddr
, dif
, sdif
,
841 /* If zero checksum and no_check is not on for
842 * the socket then skip it.
844 if (!uh
->check
&& !udp_sk(sk
)->no_check6_rx
)
850 nskb
= skb_clone(skb
, GFP_ATOMIC
);
851 if (unlikely(!nskb
)) {
852 atomic_inc(&sk
->sk_drops
);
853 __UDP6_INC_STATS(net
, UDP_MIB_RCVBUFERRORS
,
855 __UDP6_INC_STATS(net
, UDP_MIB_INERRORS
,
860 if (udpv6_queue_rcv_skb(sk
, nskb
) > 0)
864 /* Also lookup *:port if we are using hash2 and haven't done so yet. */
865 if (use_hash2
&& hash2
!= hash2_any
) {
871 if (udpv6_queue_rcv_skb(first
, skb
) > 0)
875 __UDP6_INC_STATS(net
, UDP_MIB_IGNOREDMULTI
,
876 proto
== IPPROTO_UDPLITE
);
881 static void udp6_sk_rx_dst_set(struct sock
*sk
, struct dst_entry
*dst
)
883 if (udp_sk_rx_dst_set(sk
, dst
)) {
884 const struct rt6_info
*rt
= (const struct rt6_info
*)dst
;
886 inet6_sk(sk
)->rx_dst_cookie
= rt6_get_cookie(rt
);
890 /* wrapper for udp_queue_rcv_skb tacking care of csum conversion and
891 * return code conversion for ip layer consumption
893 static int udp6_unicast_rcv_skb(struct sock
*sk
, struct sk_buff
*skb
,
898 if (inet_get_convert_csum(sk
) && uh
->check
&& !IS_UDPLITE(sk
))
899 skb_checksum_try_convert(skb
, IPPROTO_UDP
, ip6_compute_pseudo
);
901 ret
= udpv6_queue_rcv_skb(sk
, skb
);
903 /* a return value > 0 means to resubmit the input */
909 int __udp6_lib_rcv(struct sk_buff
*skb
, struct udp_table
*udptable
,
912 const struct in6_addr
*saddr
, *daddr
;
913 struct net
*net
= dev_net(skb
->dev
);
919 if (!pskb_may_pull(skb
, sizeof(struct udphdr
)))
922 saddr
= &ipv6_hdr(skb
)->saddr
;
923 daddr
= &ipv6_hdr(skb
)->daddr
;
926 ulen
= ntohs(uh
->len
);
930 if (proto
== IPPROTO_UDP
) {
931 /* UDP validates ulen. */
933 /* Check for jumbo payload */
937 if (ulen
< sizeof(*uh
))
940 if (ulen
< skb
->len
) {
941 if (pskb_trim_rcsum(skb
, ulen
))
943 saddr
= &ipv6_hdr(skb
)->saddr
;
944 daddr
= &ipv6_hdr(skb
)->daddr
;
949 if (udp6_csum_init(skb
, uh
, proto
))
952 /* Check if the socket is already available, e.g. due to early demux */
953 sk
= skb_steal_sock(skb
, &refcounted
);
955 struct dst_entry
*dst
= skb_dst(skb
);
958 if (unlikely(sk
->sk_rx_dst
!= dst
))
959 udp6_sk_rx_dst_set(sk
, dst
);
961 if (!uh
->check
&& !udp_sk(sk
)->no_check6_rx
) {
964 goto report_csum_error
;
967 ret
= udp6_unicast_rcv_skb(sk
, skb
, uh
);
974 * Multicast receive code
976 if (ipv6_addr_is_multicast(daddr
))
977 return __udp6_lib_mcast_deliver(net
, skb
,
978 saddr
, daddr
, udptable
, proto
);
981 sk
= __udp6_lib_lookup_skb(skb
, uh
->source
, uh
->dest
, udptable
);
983 if (!uh
->check
&& !udp_sk(sk
)->no_check6_rx
)
984 goto report_csum_error
;
985 return udp6_unicast_rcv_skb(sk
, skb
, uh
);
989 goto report_csum_error
;
991 if (!xfrm6_policy_check(NULL
, XFRM_POLICY_IN
, skb
))
994 if (udp_lib_checksum_complete(skb
))
997 __UDP6_INC_STATS(net
, UDP_MIB_NOPORTS
, proto
== IPPROTO_UDPLITE
);
998 icmpv6_send(skb
, ICMPV6_DEST_UNREACH
, ICMPV6_PORT_UNREACH
, 0);
1004 net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n",
1005 proto
== IPPROTO_UDPLITE
? "-Lite" : "",
1006 saddr
, ntohs(uh
->source
),
1008 daddr
, ntohs(uh
->dest
));
1012 udp6_csum_zero_error(skb
);
1014 __UDP6_INC_STATS(net
, UDP_MIB_CSUMERRORS
, proto
== IPPROTO_UDPLITE
);
1016 __UDP6_INC_STATS(net
, UDP_MIB_INERRORS
, proto
== IPPROTO_UDPLITE
);
1022 static struct sock
*__udp6_lib_demux_lookup(struct net
*net
,
1023 __be16 loc_port
, const struct in6_addr
*loc_addr
,
1024 __be16 rmt_port
, const struct in6_addr
*rmt_addr
,
1027 unsigned short hnum
= ntohs(loc_port
);
1028 unsigned int hash2
= ipv6_portaddr_hash(net
, loc_addr
, hnum
);
1029 unsigned int slot2
= hash2
& udp_table
.mask
;
1030 struct udp_hslot
*hslot2
= &udp_table
.hash2
[slot2
];
1031 const __portpair ports
= INET_COMBINED_PORTS(rmt_port
, hnum
);
1034 udp_portaddr_for_each_entry_rcu(sk
, &hslot2
->head
) {
1035 if (sk
->sk_state
== TCP_ESTABLISHED
&&
1036 INET6_MATCH(sk
, net
, rmt_addr
, loc_addr
, ports
, dif
, sdif
))
1038 /* Only check first socket in chain */
1044 INDIRECT_CALLABLE_SCOPE
void udp_v6_early_demux(struct sk_buff
*skb
)
1046 struct net
*net
= dev_net(skb
->dev
);
1047 const struct udphdr
*uh
;
1049 struct dst_entry
*dst
;
1050 int dif
= skb
->dev
->ifindex
;
1051 int sdif
= inet6_sdif(skb
);
1053 if (!pskb_may_pull(skb
, skb_transport_offset(skb
) +
1054 sizeof(struct udphdr
)))
1059 if (skb
->pkt_type
== PACKET_HOST
)
1060 sk
= __udp6_lib_demux_lookup(net
, uh
->dest
,
1061 &ipv6_hdr(skb
)->daddr
,
1062 uh
->source
, &ipv6_hdr(skb
)->saddr
,
1067 if (!sk
|| !refcount_inc_not_zero(&sk
->sk_refcnt
))
1071 skb
->destructor
= sock_efree
;
1072 dst
= READ_ONCE(sk
->sk_rx_dst
);
1075 dst
= dst_check(dst
, inet6_sk(sk
)->rx_dst_cookie
);
1077 /* set noref for now.
1078 * any place which wants to hold dst has to call
1081 skb_dst_set_noref(skb
, dst
);
1085 INDIRECT_CALLABLE_SCOPE
int udpv6_rcv(struct sk_buff
*skb
)
1087 return __udp6_lib_rcv(skb
, &udp_table
, IPPROTO_UDP
);
1091 * Throw away all pending data and cancel the corking. Socket is locked.
1093 static void udp_v6_flush_pending_frames(struct sock
*sk
)
1095 struct udp_sock
*up
= udp_sk(sk
);
1097 if (up
->pending
== AF_INET
)
1098 udp_flush_pending_frames(sk
);
1099 else if (up
->pending
) {
1102 ip6_flush_pending_frames(sk
);
1106 static int udpv6_pre_connect(struct sock
*sk
, struct sockaddr
*uaddr
,
1109 if (addr_len
< offsetofend(struct sockaddr
, sa_family
))
1111 /* The following checks are replicated from __ip6_datagram_connect()
1112 * and intended to prevent BPF program called below from accessing
1113 * bytes that are out of the bound specified by user in addr_len.
1115 if (uaddr
->sa_family
== AF_INET
) {
1116 if (__ipv6_only_sock(sk
))
1117 return -EAFNOSUPPORT
;
1118 return udp_pre_connect(sk
, uaddr
, addr_len
);
1121 if (addr_len
< SIN6_LEN_RFC2133
)
1124 return BPF_CGROUP_RUN_PROG_INET6_CONNECT_LOCK(sk
, uaddr
);
1128 * udp6_hwcsum_outgoing - handle outgoing HW checksumming
1129 * @sk: socket we are sending on
1130 * @skb: sk_buff containing the filled-in UDP header
1131 * (checksum field must be zeroed out)
1132 * @saddr: source address
1133 * @daddr: destination address
1134 * @len: length of packet
1136 static void udp6_hwcsum_outgoing(struct sock
*sk
, struct sk_buff
*skb
,
1137 const struct in6_addr
*saddr
,
1138 const struct in6_addr
*daddr
, int len
)
1140 unsigned int offset
;
1141 struct udphdr
*uh
= udp_hdr(skb
);
1142 struct sk_buff
*frags
= skb_shinfo(skb
)->frag_list
;
1146 /* Only one fragment on the socket. */
1147 skb
->csum_start
= skb_transport_header(skb
) - skb
->head
;
1148 skb
->csum_offset
= offsetof(struct udphdr
, check
);
1149 uh
->check
= ~csum_ipv6_magic(saddr
, daddr
, len
, IPPROTO_UDP
, 0);
1152 * HW-checksum won't work as there are two or more
1153 * fragments on the socket so that all csums of sk_buffs
1154 * should be together
1156 offset
= skb_transport_offset(skb
);
1157 skb
->csum
= skb_checksum(skb
, offset
, skb
->len
- offset
, 0);
1160 skb
->ip_summed
= CHECKSUM_NONE
;
1163 csum
= csum_add(csum
, frags
->csum
);
1164 } while ((frags
= frags
->next
));
1166 uh
->check
= csum_ipv6_magic(saddr
, daddr
, len
, IPPROTO_UDP
,
1169 uh
->check
= CSUM_MANGLED_0
;
1177 static int udp_v6_send_skb(struct sk_buff
*skb
, struct flowi6
*fl6
,
1178 struct inet_cork
*cork
)
1180 struct sock
*sk
= skb
->sk
;
1183 int is_udplite
= IS_UDPLITE(sk
);
1185 int offset
= skb_transport_offset(skb
);
1186 int len
= skb
->len
- offset
;
1187 int datalen
= len
- sizeof(*uh
);
1190 * Create a UDP header
1193 uh
->source
= fl6
->fl6_sport
;
1194 uh
->dest
= fl6
->fl6_dport
;
1195 uh
->len
= htons(len
);
1198 if (cork
->gso_size
) {
1199 const int hlen
= skb_network_header_len(skb
) +
1200 sizeof(struct udphdr
);
1202 if (hlen
+ cork
->gso_size
> cork
->fragsize
) {
1206 if (skb
->len
> cork
->gso_size
* UDP_MAX_SEGMENTS
) {
1210 if (udp_sk(sk
)->no_check6_tx
) {
1214 if (skb
->ip_summed
!= CHECKSUM_PARTIAL
|| is_udplite
||
1215 dst_xfrm(skb_dst(skb
))) {
1220 if (datalen
> cork
->gso_size
) {
1221 skb_shinfo(skb
)->gso_size
= cork
->gso_size
;
1222 skb_shinfo(skb
)->gso_type
= SKB_GSO_UDP_L4
;
1223 skb_shinfo(skb
)->gso_segs
= DIV_ROUND_UP(datalen
,
1230 csum
= udplite_csum(skb
);
1231 else if (udp_sk(sk
)->no_check6_tx
) { /* UDP csum disabled */
1232 skb
->ip_summed
= CHECKSUM_NONE
;
1234 } else if (skb
->ip_summed
== CHECKSUM_PARTIAL
) { /* UDP hardware csum */
1236 udp6_hwcsum_outgoing(sk
, skb
, &fl6
->saddr
, &fl6
->daddr
, len
);
1239 csum
= udp_csum(skb
);
1241 /* add protocol-dependent pseudo-header */
1242 uh
->check
= csum_ipv6_magic(&fl6
->saddr
, &fl6
->daddr
,
1243 len
, fl6
->flowi6_proto
, csum
);
1245 uh
->check
= CSUM_MANGLED_0
;
1248 err
= ip6_send_skb(skb
);
1250 if (err
== -ENOBUFS
&& !inet6_sk(sk
)->recverr
) {
1251 UDP6_INC_STATS(sock_net(sk
),
1252 UDP_MIB_SNDBUFERRORS
, is_udplite
);
1256 UDP6_INC_STATS(sock_net(sk
),
1257 UDP_MIB_OUTDATAGRAMS
, is_udplite
);
1262 static int udp_v6_push_pending_frames(struct sock
*sk
)
1264 struct sk_buff
*skb
;
1265 struct udp_sock
*up
= udp_sk(sk
);
1269 if (up
->pending
== AF_INET
)
1270 return udp_push_pending_frames(sk
);
1272 /* ip6_finish_skb will release the cork, so make a copy of
1275 fl6
= inet_sk(sk
)->cork
.fl
.u
.ip6
;
1277 skb
= ip6_finish_skb(sk
);
1281 err
= udp_v6_send_skb(skb
, &fl6
, &inet_sk(sk
)->cork
.base
);
1289 int udpv6_sendmsg(struct sock
*sk
, struct msghdr
*msg
, size_t len
)
1291 struct ipv6_txoptions opt_space
;
1292 struct udp_sock
*up
= udp_sk(sk
);
1293 struct inet_sock
*inet
= inet_sk(sk
);
1294 struct ipv6_pinfo
*np
= inet6_sk(sk
);
1295 DECLARE_SOCKADDR(struct sockaddr_in6
*, sin6
, msg
->msg_name
);
1296 struct in6_addr
*daddr
, *final_p
, final
;
1297 struct ipv6_txoptions
*opt
= NULL
;
1298 struct ipv6_txoptions
*opt_to_free
= NULL
;
1299 struct ip6_flowlabel
*flowlabel
= NULL
;
1301 struct dst_entry
*dst
;
1302 struct ipcm6_cookie ipc6
;
1303 int addr_len
= msg
->msg_namelen
;
1304 bool connected
= false;
1306 int corkreq
= up
->corkflag
|| msg
->msg_flags
&MSG_MORE
;
1308 int is_udplite
= IS_UDPLITE(sk
);
1309 int (*getfrag
)(void *, char *, int, int, int, struct sk_buff
*);
1312 ipc6
.gso_size
= READ_ONCE(up
->gso_size
);
1313 ipc6
.sockc
.tsflags
= sk
->sk_tsflags
;
1314 ipc6
.sockc
.mark
= sk
->sk_mark
;
1316 /* destination address check */
1318 if (addr_len
< offsetof(struct sockaddr
, sa_data
))
1321 switch (sin6
->sin6_family
) {
1323 if (addr_len
< SIN6_LEN_RFC2133
)
1325 daddr
= &sin6
->sin6_addr
;
1326 if (ipv6_addr_any(daddr
) &&
1327 ipv6_addr_v4mapped(&np
->saddr
))
1328 ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK
),
1332 goto do_udp_sendmsg
;
1334 msg
->msg_name
= sin6
= NULL
;
1335 msg
->msg_namelen
= addr_len
= 0;
1341 } else if (!up
->pending
) {
1342 if (sk
->sk_state
!= TCP_ESTABLISHED
)
1343 return -EDESTADDRREQ
;
1344 daddr
= &sk
->sk_v6_daddr
;
1349 if (ipv6_addr_v4mapped(daddr
)) {
1350 struct sockaddr_in sin
;
1351 sin
.sin_family
= AF_INET
;
1352 sin
.sin_port
= sin6
? sin6
->sin6_port
: inet
->inet_dport
;
1353 sin
.sin_addr
.s_addr
= daddr
->s6_addr32
[3];
1354 msg
->msg_name
= &sin
;
1355 msg
->msg_namelen
= sizeof(sin
);
1357 if (__ipv6_only_sock(sk
))
1358 return -ENETUNREACH
;
1359 return udp_sendmsg(sk
, msg
, len
);
1363 if (up
->pending
== AF_INET
)
1364 return udp_sendmsg(sk
, msg
, len
);
1366 /* Rough check on arithmetic overflow,
1367 better check is made in ip6_append_data().
1369 if (len
> INT_MAX
- sizeof(struct udphdr
))
1372 getfrag
= is_udplite
? udplite_getfrag
: ip_generic_getfrag
;
1375 * There are pending frames.
1376 * The socket lock must be held while it's corked.
1379 if (likely(up
->pending
)) {
1380 if (unlikely(up
->pending
!= AF_INET6
)) {
1382 return -EAFNOSUPPORT
;
1385 goto do_append_data
;
1389 ulen
+= sizeof(struct udphdr
);
1391 memset(&fl6
, 0, sizeof(fl6
));
1394 if (sin6
->sin6_port
== 0)
1397 fl6
.fl6_dport
= sin6
->sin6_port
;
1398 daddr
= &sin6
->sin6_addr
;
1401 fl6
.flowlabel
= sin6
->sin6_flowinfo
&IPV6_FLOWINFO_MASK
;
1402 if (fl6
.flowlabel
&IPV6_FLOWLABEL_MASK
) {
1403 flowlabel
= fl6_sock_lookup(sk
, fl6
.flowlabel
);
1404 if (IS_ERR(flowlabel
))
1410 * Otherwise it will be difficult to maintain
1413 if (sk
->sk_state
== TCP_ESTABLISHED
&&
1414 ipv6_addr_equal(daddr
, &sk
->sk_v6_daddr
))
1415 daddr
= &sk
->sk_v6_daddr
;
1417 if (addr_len
>= sizeof(struct sockaddr_in6
) &&
1418 sin6
->sin6_scope_id
&&
1419 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr
)))
1420 fl6
.flowi6_oif
= sin6
->sin6_scope_id
;
1422 if (sk
->sk_state
!= TCP_ESTABLISHED
)
1423 return -EDESTADDRREQ
;
1425 fl6
.fl6_dport
= inet
->inet_dport
;
1426 daddr
= &sk
->sk_v6_daddr
;
1427 fl6
.flowlabel
= np
->flow_label
;
1431 if (!fl6
.flowi6_oif
)
1432 fl6
.flowi6_oif
= sk
->sk_bound_dev_if
;
1434 if (!fl6
.flowi6_oif
)
1435 fl6
.flowi6_oif
= np
->sticky_pktinfo
.ipi6_ifindex
;
1437 fl6
.flowi6_mark
= ipc6
.sockc
.mark
;
1438 fl6
.flowi6_uid
= sk
->sk_uid
;
1440 if (msg
->msg_controllen
) {
1442 memset(opt
, 0, sizeof(struct ipv6_txoptions
));
1443 opt
->tot_len
= sizeof(*opt
);
1446 err
= udp_cmsg_send(sk
, msg
, &ipc6
.gso_size
);
1448 err
= ip6_datagram_send_ctl(sock_net(sk
), sk
, msg
, &fl6
,
1451 fl6_sock_release(flowlabel
);
1454 if ((fl6
.flowlabel
&IPV6_FLOWLABEL_MASK
) && !flowlabel
) {
1455 flowlabel
= fl6_sock_lookup(sk
, fl6
.flowlabel
);
1456 if (IS_ERR(flowlabel
))
1459 if (!(opt
->opt_nflen
|opt
->opt_flen
))
1464 opt
= txopt_get(np
);
1468 opt
= fl6_merge_options(&opt_space
, flowlabel
, opt
);
1469 opt
= ipv6_fixup_options(&opt_space
, opt
);
1472 fl6
.flowi6_proto
= sk
->sk_protocol
;
1474 if (ipv6_addr_any(&fl6
.saddr
) && !ipv6_addr_any(&np
->saddr
))
1475 fl6
.saddr
= np
->saddr
;
1476 fl6
.fl6_sport
= inet
->inet_sport
;
1478 if (cgroup_bpf_enabled(CGROUP_UDP6_SENDMSG
) && !connected
) {
1479 err
= BPF_CGROUP_RUN_PROG_UDP6_SENDMSG_LOCK(sk
,
1480 (struct sockaddr
*)sin6
, &fl6
.saddr
);
1484 if (ipv6_addr_v4mapped(&sin6
->sin6_addr
)) {
1485 /* BPF program rewrote IPv6-only by IPv4-mapped
1486 * IPv6. It's currently unsupported.
1491 if (sin6
->sin6_port
== 0) {
1492 /* BPF program set invalid port. Reject it. */
1496 fl6
.fl6_dport
= sin6
->sin6_port
;
1497 fl6
.daddr
= sin6
->sin6_addr
;
1501 if (ipv6_addr_any(&fl6
.daddr
))
1502 fl6
.daddr
.s6_addr
[15] = 0x1; /* :: means loopback (BSD'ism) */
1504 final_p
= fl6_update_dst(&fl6
, opt
, &final
);
1508 if (!fl6
.flowi6_oif
&& ipv6_addr_is_multicast(&fl6
.daddr
)) {
1509 fl6
.flowi6_oif
= np
->mcast_oif
;
1511 } else if (!fl6
.flowi6_oif
)
1512 fl6
.flowi6_oif
= np
->ucast_oif
;
1514 security_sk_classify_flow(sk
, flowi6_to_flowi_common(&fl6
));
1516 if (ipc6
.tclass
< 0)
1517 ipc6
.tclass
= np
->tclass
;
1519 fl6
.flowlabel
= ip6_make_flowinfo(ipc6
.tclass
, fl6
.flowlabel
);
1521 dst
= ip6_sk_dst_lookup_flow(sk
, &fl6
, final_p
, connected
);
1528 if (ipc6
.hlimit
< 0)
1529 ipc6
.hlimit
= ip6_sk_dst_hoplimit(np
, &fl6
, dst
);
1531 if (msg
->msg_flags
&MSG_CONFIRM
)
1535 /* Lockless fast path for the non-corking case */
1537 struct inet_cork_full cork
;
1538 struct sk_buff
*skb
;
1540 skb
= ip6_make_skb(sk
, getfrag
, msg
, ulen
,
1541 sizeof(struct udphdr
), &ipc6
,
1542 &fl6
, (struct rt6_info
*)dst
,
1543 msg
->msg_flags
, &cork
);
1545 if (!IS_ERR_OR_NULL(skb
))
1546 err
= udp_v6_send_skb(skb
, &fl6
, &cork
.base
);
1551 if (unlikely(up
->pending
)) {
1552 /* The socket is already corked while preparing it. */
1553 /* ... which is an evident application bug. --ANK */
1556 net_dbg_ratelimited("udp cork app bug 2\n");
1561 up
->pending
= AF_INET6
;
1564 if (ipc6
.dontfrag
< 0)
1565 ipc6
.dontfrag
= np
->dontfrag
;
1567 err
= ip6_append_data(sk
, getfrag
, msg
, ulen
, sizeof(struct udphdr
),
1568 &ipc6
, &fl6
, (struct rt6_info
*)dst
,
1569 corkreq
? msg
->msg_flags
|MSG_MORE
: msg
->msg_flags
);
1571 udp_v6_flush_pending_frames(sk
);
1573 err
= udp_v6_push_pending_frames(sk
);
1574 else if (unlikely(skb_queue_empty(&sk
->sk_write_queue
)))
1578 err
= np
->recverr
? net_xmit_errno(err
) : 0;
1584 fl6_sock_release(flowlabel
);
1585 txopt_put(opt_to_free
);
1589 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
1590 * ENOBUFS might not be good (it's not tunable per se), but otherwise
1591 * we don't have a good statistic (IpOutDiscards but it can be too many
1592 * things). We could add another new stat but at least for now that
1593 * seems like overkill.
1595 if (err
== -ENOBUFS
|| test_bit(SOCK_NOSPACE
, &sk
->sk_socket
->flags
)) {
1596 UDP6_INC_STATS(sock_net(sk
),
1597 UDP_MIB_SNDBUFERRORS
, is_udplite
);
1602 if (msg
->msg_flags
& MSG_PROBE
)
1603 dst_confirm_neigh(dst
, &fl6
.daddr
);
1604 if (!(msg
->msg_flags
&MSG_PROBE
) || len
)
1605 goto back_from_confirm
;
1610 void udpv6_destroy_sock(struct sock
*sk
)
1612 struct udp_sock
*up
= udp_sk(sk
);
1615 /* protects from races with udp_abort() */
1616 sock_set_flag(sk
, SOCK_DEAD
);
1617 udp_v6_flush_pending_frames(sk
);
1620 if (static_branch_unlikely(&udpv6_encap_needed_key
)) {
1621 if (up
->encap_type
) {
1622 void (*encap_destroy
)(struct sock
*sk
);
1623 encap_destroy
= READ_ONCE(up
->encap_destroy
);
1627 if (up
->encap_enabled
) {
1628 static_branch_dec(&udpv6_encap_needed_key
);
1629 udp_encap_disable();
1633 inet6_destroy_sock(sk
);
1637 * Socket option code for UDP
1639 int udpv6_setsockopt(struct sock
*sk
, int level
, int optname
, sockptr_t optval
,
1640 unsigned int optlen
)
1642 if (level
== SOL_UDP
|| level
== SOL_UDPLITE
)
1643 return udp_lib_setsockopt(sk
, level
, optname
,
1645 udp_v6_push_pending_frames
);
1646 return ipv6_setsockopt(sk
, level
, optname
, optval
, optlen
);
1649 int udpv6_getsockopt(struct sock
*sk
, int level
, int optname
,
1650 char __user
*optval
, int __user
*optlen
)
1652 if (level
== SOL_UDP
|| level
== SOL_UDPLITE
)
1653 return udp_lib_getsockopt(sk
, level
, optname
, optval
, optlen
);
1654 return ipv6_getsockopt(sk
, level
, optname
, optval
, optlen
);
1657 /* thinking of making this const? Don't.
1658 * early_demux can change based on sysctl.
1660 static struct inet6_protocol udpv6_protocol
= {
1661 .early_demux
= udp_v6_early_demux
,
1662 .early_demux_handler
= udp_v6_early_demux
,
1663 .handler
= udpv6_rcv
,
1664 .err_handler
= udpv6_err
,
1665 .flags
= INET6_PROTO_NOPOLICY
|INET6_PROTO_FINAL
,
1668 /* ------------------------------------------------------------------------ */
1669 #ifdef CONFIG_PROC_FS
1670 int udp6_seq_show(struct seq_file
*seq
, void *v
)
1672 if (v
== SEQ_START_TOKEN
) {
1673 seq_puts(seq
, IPV6_SEQ_DGRAM_HEADER
);
1675 int bucket
= ((struct udp_iter_state
*)seq
->private)->bucket
;
1676 struct inet_sock
*inet
= inet_sk(v
);
1677 __u16 srcp
= ntohs(inet
->inet_sport
);
1678 __u16 destp
= ntohs(inet
->inet_dport
);
1679 __ip6_dgram_sock_seq_show(seq
, v
, srcp
, destp
,
1680 udp_rqueue_get(v
), bucket
);
1685 const struct seq_operations udp6_seq_ops
= {
1686 .start
= udp_seq_start
,
1687 .next
= udp_seq_next
,
1688 .stop
= udp_seq_stop
,
1689 .show
= udp6_seq_show
,
1691 EXPORT_SYMBOL(udp6_seq_ops
);
1693 static struct udp_seq_afinfo udp6_seq_afinfo
= {
1695 .udp_table
= &udp_table
,
1698 int __net_init
udp6_proc_init(struct net
*net
)
1700 if (!proc_create_net_data("udp6", 0444, net
->proc_net
, &udp6_seq_ops
,
1701 sizeof(struct udp_iter_state
), &udp6_seq_afinfo
))
1706 void udp6_proc_exit(struct net
*net
)
1708 remove_proc_entry("udp6", net
->proc_net
);
1710 #endif /* CONFIG_PROC_FS */
1712 /* ------------------------------------------------------------------------ */
1714 struct proto udpv6_prot
= {
1716 .owner
= THIS_MODULE
,
1717 .close
= udp_lib_close
,
1718 .pre_connect
= udpv6_pre_connect
,
1719 .connect
= ip6_datagram_connect
,
1720 .disconnect
= udp_disconnect
,
1722 .init
= udp_init_sock
,
1723 .destroy
= udpv6_destroy_sock
,
1724 .setsockopt
= udpv6_setsockopt
,
1725 .getsockopt
= udpv6_getsockopt
,
1726 .sendmsg
= udpv6_sendmsg
,
1727 .recvmsg
= udpv6_recvmsg
,
1728 .release_cb
= ip6_datagram_release_cb
,
1729 .hash
= udp_lib_hash
,
1730 .unhash
= udp_lib_unhash
,
1731 .rehash
= udp_v6_rehash
,
1732 .get_port
= udp_v6_get_port
,
1733 #ifdef CONFIG_BPF_SYSCALL
1734 .psock_update_sk_prot
= udp_bpf_update_proto
,
1736 .memory_allocated
= &udp_memory_allocated
,
1737 .sysctl_mem
= sysctl_udp_mem
,
1738 .sysctl_wmem_offset
= offsetof(struct net
, ipv4
.sysctl_udp_wmem_min
),
1739 .sysctl_rmem_offset
= offsetof(struct net
, ipv4
.sysctl_udp_rmem_min
),
1740 .obj_size
= sizeof(struct udp6_sock
),
1741 .h
.udp_table
= &udp_table
,
1742 .diag_destroy
= udp_abort
,
1745 static struct inet_protosw udpv6_protosw
= {
1747 .protocol
= IPPROTO_UDP
,
1748 .prot
= &udpv6_prot
,
1749 .ops
= &inet6_dgram_ops
,
1750 .flags
= INET_PROTOSW_PERMANENT
,
1753 int __init
udpv6_init(void)
1757 ret
= inet6_add_protocol(&udpv6_protocol
, IPPROTO_UDP
);
1761 ret
= inet6_register_protosw(&udpv6_protosw
);
1763 goto out_udpv6_protocol
;
1768 inet6_del_protocol(&udpv6_protocol
, IPPROTO_UDP
);
1772 void udpv6_exit(void)
1774 inet6_unregister_protosw(&udpv6_protosw
);
1775 inet6_del_protocol(&udpv6_protocol
, IPPROTO_UDP
);