3 * Linux INET6 implementation
6 * Pedro Roque <roque@di.fc.ul.pt>
8 * Based on linux/ipv4/udp.c
11 * Hideaki YOSHIFUJI : sin6_scope_id support
12 * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which
13 * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind
14 * a single port at the same time.
15 * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data
16 * YOSHIFUJI Hideaki @USAGI: convert /proc/net/udp6 to seq_file.
18 * This program is free software; you can redistribute it and/or
19 * modify it under the terms of the GNU General Public License
20 * as published by the Free Software Foundation; either version
21 * 2 of the License, or (at your option) any later version.
24 #include <linux/errno.h>
25 #include <linux/types.h>
26 #include <linux/socket.h>
27 #include <linux/sockios.h>
28 #include <linux/net.h>
29 #include <linux/in6.h>
30 #include <linux/netdevice.h>
31 #include <linux/if_arp.h>
32 #include <linux/ipv6.h>
33 #include <linux/icmpv6.h>
34 #include <linux/init.h>
35 #include <linux/module.h>
36 #include <linux/skbuff.h>
37 #include <linux/slab.h>
38 #include <asm/uaccess.h>
40 #include <net/addrconf.h>
41 #include <net/ndisc.h>
42 #include <net/protocol.h>
43 #include <net/transp_v6.h>
44 #include <net/ip6_route.h>
46 #include <net/tcp_states.h>
47 #include <net/ip6_checksum.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 u32
udp6_ehashfn(const struct net
*net
,
59 const struct in6_addr
*laddr
,
61 const struct in6_addr
*faddr
,
64 static u32 udp6_ehash_secret __read_mostly
;
65 static u32 udp_ipv6_hash_secret __read_mostly
;
69 net_get_random_once(&udp6_ehash_secret
,
70 sizeof(udp6_ehash_secret
));
71 net_get_random_once(&udp_ipv6_hash_secret
,
72 sizeof(udp_ipv6_hash_secret
));
74 lhash
= (__force u32
)laddr
->s6_addr32
[3];
75 fhash
= __ipv6_addr_jhash(faddr
, udp_ipv6_hash_secret
);
77 return __inet6_ehashfn(lhash
, lport
, fhash
, fport
,
78 udp_ipv6_hash_secret
+ net_hash_mix(net
));
81 static u32
udp6_portaddr_hash(const struct net
*net
,
82 const struct in6_addr
*addr6
,
85 unsigned int hash
, mix
= net_hash_mix(net
);
87 if (ipv6_addr_any(addr6
))
88 hash
= jhash_1word(0, mix
);
89 else if (ipv6_addr_v4mapped(addr6
))
90 hash
= jhash_1word((__force u32
)addr6
->s6_addr32
[3], mix
);
92 hash
= jhash2((__force u32
*)addr6
->s6_addr32
, 4, mix
);
97 int udp_v6_get_port(struct sock
*sk
, unsigned short snum
)
99 unsigned int hash2_nulladdr
=
100 udp6_portaddr_hash(sock_net(sk
), &in6addr_any
, snum
);
101 unsigned int hash2_partial
=
102 udp6_portaddr_hash(sock_net(sk
), &sk
->sk_v6_rcv_saddr
, 0);
104 /* precompute partial secondary hash */
105 udp_sk(sk
)->udp_portaddr_hash
= hash2_partial
;
106 return udp_lib_get_port(sk
, snum
, ipv6_rcv_saddr_equal
, hash2_nulladdr
);
109 static void udp_v6_rehash(struct sock
*sk
)
111 u16 new_hash
= udp6_portaddr_hash(sock_net(sk
),
112 &sk
->sk_v6_rcv_saddr
,
113 inet_sk(sk
)->inet_num
);
115 udp_lib_rehash(sk
, new_hash
);
118 static inline int compute_score(struct sock
*sk
, struct net
*net
,
120 const struct in6_addr
*saddr
, __be16 sport
,
121 const struct in6_addr
*daddr
, __be16 dport
,
125 struct inet_sock
*inet
;
127 if (!net_eq(sock_net(sk
), net
) ||
128 udp_sk(sk
)->udp_port_hash
!= hnum
||
129 sk
->sk_family
!= PF_INET6
)
135 if (inet
->inet_dport
) {
136 if (inet
->inet_dport
!= sport
)
141 if (!ipv6_addr_any(&sk
->sk_v6_rcv_saddr
)) {
142 if (!ipv6_addr_equal(&sk
->sk_v6_rcv_saddr
, daddr
))
147 if (!ipv6_addr_any(&sk
->sk_v6_daddr
)) {
148 if (!ipv6_addr_equal(&sk
->sk_v6_daddr
, saddr
))
153 if (sk
->sk_bound_dev_if
) {
154 if (sk
->sk_bound_dev_if
!= dif
)
159 if (sk
->sk_incoming_cpu
== raw_smp_processor_id())
165 static inline int compute_score2(struct sock
*sk
, struct net
*net
,
166 const struct in6_addr
*saddr
, __be16 sport
,
167 const struct in6_addr
*daddr
,
168 unsigned short hnum
, int dif
)
171 struct inet_sock
*inet
;
173 if (!net_eq(sock_net(sk
), net
) ||
174 udp_sk(sk
)->udp_port_hash
!= hnum
||
175 sk
->sk_family
!= PF_INET6
)
178 if (!ipv6_addr_equal(&sk
->sk_v6_rcv_saddr
, daddr
))
184 if (inet
->inet_dport
) {
185 if (inet
->inet_dport
!= sport
)
190 if (!ipv6_addr_any(&sk
->sk_v6_daddr
)) {
191 if (!ipv6_addr_equal(&sk
->sk_v6_daddr
, saddr
))
196 if (sk
->sk_bound_dev_if
) {
197 if (sk
->sk_bound_dev_if
!= dif
)
202 if (sk
->sk_incoming_cpu
== raw_smp_processor_id())
208 /* called with read_rcu_lock() */
209 static struct sock
*udp6_lib_lookup2(struct net
*net
,
210 const struct in6_addr
*saddr
, __be16 sport
,
211 const struct in6_addr
*daddr
, unsigned int hnum
, int dif
,
212 struct udp_hslot
*hslot2
, unsigned int slot2
,
215 struct sock
*sk
, *result
;
216 struct hlist_nulls_node
*node
;
217 int score
, badness
, matches
= 0, reuseport
= 0;
218 bool select_ok
= true;
224 udp_portaddr_for_each_entry_rcu(sk
, node
, &hslot2
->head
) {
225 score
= compute_score2(sk
, net
, saddr
, sport
,
227 if (score
> badness
) {
230 reuseport
= sk
->sk_reuseport
;
232 hash
= udp6_ehashfn(net
, daddr
, hnum
,
237 sk2
= reuseport_select_sock(sk
, hash
, skb
,
238 sizeof(struct udphdr
));
247 } else if (score
== badness
&& reuseport
) {
249 if (reciprocal_scale(hash
, matches
) == 0)
251 hash
= next_pseudo_random32(hash
);
255 * if the nulls value we got at the end of this lookup is
256 * not the expected one, we must restart lookup.
257 * We probably met an item that was moved to another chain.
259 if (get_nulls_value(node
) != slot2
)
264 if (unlikely(!atomic_inc_not_zero_hint(&result
->sk_refcnt
, 2)))
266 else if (unlikely(compute_score2(result
, net
, saddr
, sport
,
267 daddr
, hnum
, dif
) < badness
)) {
275 struct sock
*__udp6_lib_lookup(struct net
*net
,
276 const struct in6_addr
*saddr
, __be16 sport
,
277 const struct in6_addr
*daddr
, __be16 dport
,
278 int dif
, struct udp_table
*udptable
,
281 struct sock
*sk
, *result
;
282 struct hlist_nulls_node
*node
;
283 unsigned short hnum
= ntohs(dport
);
284 unsigned int hash2
, slot2
, slot
= udp_hashfn(net
, hnum
, udptable
->mask
);
285 struct udp_hslot
*hslot2
, *hslot
= &udptable
->hash
[slot
];
286 int score
, badness
, matches
= 0, reuseport
= 0;
287 bool select_ok
= true;
291 if (hslot
->count
> 10) {
292 hash2
= udp6_portaddr_hash(net
, daddr
, hnum
);
293 slot2
= hash2
& udptable
->mask
;
294 hslot2
= &udptable
->hash2
[slot2
];
295 if (hslot
->count
< hslot2
->count
)
298 result
= udp6_lib_lookup2(net
, saddr
, sport
,
302 hash2
= udp6_portaddr_hash(net
, &in6addr_any
, hnum
);
303 slot2
= hash2
& udptable
->mask
;
304 hslot2
= &udptable
->hash2
[slot2
];
305 if (hslot
->count
< hslot2
->count
)
308 result
= udp6_lib_lookup2(net
, saddr
, sport
,
309 &in6addr_any
, hnum
, dif
,
318 sk_nulls_for_each_rcu(sk
, node
, &hslot
->head
) {
319 score
= compute_score(sk
, net
, hnum
, saddr
, sport
, daddr
, dport
, dif
);
320 if (score
> badness
) {
323 reuseport
= sk
->sk_reuseport
;
325 hash
= udp6_ehashfn(net
, daddr
, hnum
,
330 sk2
= reuseport_select_sock(sk
, hash
, skb
,
331 sizeof(struct udphdr
));
340 } else if (score
== badness
&& reuseport
) {
342 if (reciprocal_scale(hash
, matches
) == 0)
344 hash
= next_pseudo_random32(hash
);
348 * if the nulls value we got at the end of this lookup is
349 * not the expected one, we must restart lookup.
350 * We probably met an item that was moved to another chain.
352 if (get_nulls_value(node
) != slot
)
357 if (unlikely(!atomic_inc_not_zero_hint(&result
->sk_refcnt
, 2)))
359 else if (unlikely(compute_score(result
, net
, hnum
, saddr
, sport
,
360 daddr
, dport
, dif
) < badness
)) {
368 EXPORT_SYMBOL_GPL(__udp6_lib_lookup
);
370 static struct sock
*__udp6_lib_lookup_skb(struct sk_buff
*skb
,
371 __be16 sport
, __be16 dport
,
372 struct udp_table
*udptable
)
375 const struct ipv6hdr
*iph
= ipv6_hdr(skb
);
377 sk
= skb_steal_sock(skb
);
380 return __udp6_lib_lookup(dev_net(skb_dst(skb
)->dev
), &iph
->saddr
, sport
,
381 &iph
->daddr
, dport
, inet6_iif(skb
),
385 struct sock
*udp6_lib_lookup(struct net
*net
, const struct in6_addr
*saddr
, __be16 sport
,
386 const struct in6_addr
*daddr
, __be16 dport
, int dif
)
388 return __udp6_lib_lookup(net
, saddr
, sport
, daddr
, dport
, dif
, &udp_table
, NULL
);
390 EXPORT_SYMBOL_GPL(udp6_lib_lookup
);
393 * This should be easy, if there is something there we
394 * return it, otherwise we block.
397 int udpv6_recvmsg(struct sock
*sk
, struct msghdr
*msg
, size_t len
,
398 int noblock
, int flags
, int *addr_len
)
400 struct ipv6_pinfo
*np
= inet6_sk(sk
);
401 struct inet_sock
*inet
= inet_sk(sk
);
403 unsigned int ulen
, copied
;
406 int is_udplite
= IS_UDPLITE(sk
);
407 bool checksum_valid
= false;
411 if (flags
& MSG_ERRQUEUE
)
412 return ipv6_recv_error(sk
, msg
, len
, addr_len
);
414 if (np
->rxpmtu
&& np
->rxopt
.bits
.rxpmtu
)
415 return ipv6_recv_rxpmtu(sk
, msg
, len
, addr_len
);
418 skb
= __skb_recv_datagram(sk
, flags
| (noblock
? MSG_DONTWAIT
: 0),
419 &peeked
, &off
, &err
);
423 ulen
= skb
->len
- sizeof(struct udphdr
);
427 else if (copied
< ulen
)
428 msg
->msg_flags
|= MSG_TRUNC
;
430 is_udp4
= (skb
->protocol
== htons(ETH_P_IP
));
433 * If checksum is needed at all, try to do it while copying the
434 * data. If the data is truncated, or if we only want a partial
435 * coverage checksum (UDP-Lite), do it before the copy.
438 if (copied
< ulen
|| UDP_SKB_CB(skb
)->partial_cov
) {
439 checksum_valid
= !udp_lib_checksum_complete(skb
);
444 if (checksum_valid
|| skb_csum_unnecessary(skb
))
445 err
= skb_copy_datagram_msg(skb
, sizeof(struct udphdr
),
448 err
= skb_copy_and_csum_datagram_msg(skb
, sizeof(struct udphdr
), msg
);
453 trace_kfree_skb(skb
, udpv6_recvmsg
);
455 atomic_inc(&sk
->sk_drops
);
457 UDP_INC_STATS_USER(sock_net(sk
),
461 UDP6_INC_STATS_USER(sock_net(sk
),
469 UDP_INC_STATS_USER(sock_net(sk
),
470 UDP_MIB_INDATAGRAMS
, is_udplite
);
472 UDP6_INC_STATS_USER(sock_net(sk
),
473 UDP_MIB_INDATAGRAMS
, is_udplite
);
476 sock_recv_ts_and_drops(msg
, sk
, skb
);
478 /* Copy the address. */
480 DECLARE_SOCKADDR(struct sockaddr_in6
*, sin6
, msg
->msg_name
);
481 sin6
->sin6_family
= AF_INET6
;
482 sin6
->sin6_port
= udp_hdr(skb
)->source
;
483 sin6
->sin6_flowinfo
= 0;
486 ipv6_addr_set_v4mapped(ip_hdr(skb
)->saddr
,
488 sin6
->sin6_scope_id
= 0;
490 sin6
->sin6_addr
= ipv6_hdr(skb
)->saddr
;
491 sin6
->sin6_scope_id
=
492 ipv6_iface_scope_id(&sin6
->sin6_addr
,
495 *addr_len
= sizeof(*sin6
);
499 ip6_datagram_recv_common_ctl(sk
, msg
, skb
);
502 if (inet
->cmsg_flags
)
503 ip_cmsg_recv(msg
, skb
);
506 ip6_datagram_recv_specific_ctl(sk
, msg
, skb
);
510 if (flags
& MSG_TRUNC
)
514 skb_free_datagram_locked(sk
, skb
);
519 slow
= lock_sock_fast(sk
);
520 if (!skb_kill_datagram(sk
, skb
, flags
)) {
522 UDP_INC_STATS_USER(sock_net(sk
),
523 UDP_MIB_CSUMERRORS
, is_udplite
);
524 UDP_INC_STATS_USER(sock_net(sk
),
525 UDP_MIB_INERRORS
, is_udplite
);
527 UDP6_INC_STATS_USER(sock_net(sk
),
528 UDP_MIB_CSUMERRORS
, is_udplite
);
529 UDP6_INC_STATS_USER(sock_net(sk
),
530 UDP_MIB_INERRORS
, is_udplite
);
533 unlock_sock_fast(sk
, slow
);
535 /* starting over for a new packet, but check if we need to yield */
537 msg
->msg_flags
&= ~MSG_TRUNC
;
541 void __udp6_lib_err(struct sk_buff
*skb
, struct inet6_skb_parm
*opt
,
542 u8 type
, u8 code
, int offset
, __be32 info
,
543 struct udp_table
*udptable
)
545 struct ipv6_pinfo
*np
;
546 const struct ipv6hdr
*hdr
= (const struct ipv6hdr
*)skb
->data
;
547 const struct in6_addr
*saddr
= &hdr
->saddr
;
548 const struct in6_addr
*daddr
= &hdr
->daddr
;
549 struct udphdr
*uh
= (struct udphdr
*)(skb
->data
+offset
);
553 struct net
*net
= dev_net(skb
->dev
);
555 sk
= __udp6_lib_lookup(net
, daddr
, uh
->dest
, saddr
, uh
->source
,
556 inet6_iif(skb
), udptable
, skb
);
558 ICMP6_INC_STATS_BH(net
, __in6_dev_get(skb
->dev
),
563 harderr
= icmpv6_err_convert(type
, code
, &err
);
566 if (type
== ICMPV6_PKT_TOOBIG
) {
567 if (!ip6_sk_accept_pmtu(sk
))
569 ip6_sk_update_pmtu(skb
, sk
, info
);
570 if (np
->pmtudisc
!= IPV6_PMTUDISC_DONT
)
573 if (type
== NDISC_REDIRECT
) {
574 ip6_sk_redirect(skb
, sk
);
579 if (!harderr
|| sk
->sk_state
!= TCP_ESTABLISHED
)
582 ipv6_icmp_error(sk
, skb
, err
, uh
->dest
, ntohl(info
), (u8
*)(uh
+1));
586 sk
->sk_error_report(sk
);
591 static int __udpv6_queue_rcv_skb(struct sock
*sk
, struct sk_buff
*skb
)
595 if (!ipv6_addr_any(&sk
->sk_v6_daddr
)) {
596 sock_rps_save_rxhash(sk
, skb
);
597 sk_mark_napi_id(sk
, skb
);
598 sk_incoming_cpu_update(sk
);
601 rc
= sock_queue_rcv_skb(sk
, skb
);
603 int is_udplite
= IS_UDPLITE(sk
);
605 /* Note that an ENOMEM error is charged twice */
607 UDP6_INC_STATS_BH(sock_net(sk
),
608 UDP_MIB_RCVBUFERRORS
, is_udplite
);
609 UDP6_INC_STATS_BH(sock_net(sk
), UDP_MIB_INERRORS
, is_udplite
);
616 static __inline__
void udpv6_err(struct sk_buff
*skb
,
617 struct inet6_skb_parm
*opt
, u8 type
,
618 u8 code
, int offset
, __be32 info
)
620 __udp6_lib_err(skb
, opt
, type
, code
, offset
, info
, &udp_table
);
623 static struct static_key udpv6_encap_needed __read_mostly
;
624 void udpv6_encap_enable(void)
626 if (!static_key_enabled(&udpv6_encap_needed
))
627 static_key_slow_inc(&udpv6_encap_needed
);
629 EXPORT_SYMBOL(udpv6_encap_enable
);
631 int udpv6_queue_rcv_skb(struct sock
*sk
, struct sk_buff
*skb
)
633 struct udp_sock
*up
= udp_sk(sk
);
635 int is_udplite
= IS_UDPLITE(sk
);
637 if (!xfrm6_policy_check(sk
, XFRM_POLICY_IN
, skb
))
640 if (static_key_false(&udpv6_encap_needed
) && up
->encap_type
) {
641 int (*encap_rcv
)(struct sock
*sk
, struct sk_buff
*skb
);
644 * This is an encapsulation socket so pass the skb to
645 * the socket's udp_encap_rcv() hook. Otherwise, just
646 * fall through and pass this up the UDP socket.
647 * up->encap_rcv() returns the following value:
648 * =0 if skb was successfully passed to the encap
649 * handler or was discarded by it.
650 * >0 if skb should be passed on to UDP.
651 * <0 if skb should be resubmitted as proto -N
654 /* if we're overly short, let UDP handle it */
655 encap_rcv
= ACCESS_ONCE(up
->encap_rcv
);
656 if (skb
->len
> sizeof(struct udphdr
) && encap_rcv
) {
659 /* Verify checksum before giving to encap */
660 if (udp_lib_checksum_complete(skb
))
663 ret
= encap_rcv(sk
, skb
);
665 UDP_INC_STATS_BH(sock_net(sk
),
672 /* FALLTHROUGH -- it's a UDP Packet */
676 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
678 if ((is_udplite
& UDPLITE_RECV_CC
) && UDP_SKB_CB(skb
)->partial_cov
) {
680 if (up
->pcrlen
== 0) { /* full coverage was set */
681 net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n",
682 UDP_SKB_CB(skb
)->cscov
, skb
->len
);
685 if (UDP_SKB_CB(skb
)->cscov
< up
->pcrlen
) {
686 net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n",
687 UDP_SKB_CB(skb
)->cscov
, up
->pcrlen
);
692 if (rcu_access_pointer(sk
->sk_filter
)) {
693 if (udp_lib_checksum_complete(skb
))
697 if (sk_rcvqueues_full(sk
, sk
->sk_rcvbuf
)) {
698 UDP6_INC_STATS_BH(sock_net(sk
),
699 UDP_MIB_RCVBUFERRORS
, is_udplite
);
707 if (!sock_owned_by_user(sk
))
708 rc
= __udpv6_queue_rcv_skb(sk
, skb
);
709 else if (sk_add_backlog(sk
, skb
, sk
->sk_rcvbuf
)) {
718 UDP6_INC_STATS_BH(sock_net(sk
), UDP_MIB_CSUMERRORS
, is_udplite
);
720 UDP6_INC_STATS_BH(sock_net(sk
), UDP_MIB_INERRORS
, is_udplite
);
721 atomic_inc(&sk
->sk_drops
);
726 static bool __udp_v6_is_mcast_sock(struct net
*net
, struct sock
*sk
,
727 __be16 loc_port
, const struct in6_addr
*loc_addr
,
728 __be16 rmt_port
, const struct in6_addr
*rmt_addr
,
729 int dif
, unsigned short hnum
)
731 struct inet_sock
*inet
= inet_sk(sk
);
733 if (!net_eq(sock_net(sk
), net
))
736 if (udp_sk(sk
)->udp_port_hash
!= hnum
||
737 sk
->sk_family
!= PF_INET6
||
738 (inet
->inet_dport
&& inet
->inet_dport
!= rmt_port
) ||
739 (!ipv6_addr_any(&sk
->sk_v6_daddr
) &&
740 !ipv6_addr_equal(&sk
->sk_v6_daddr
, rmt_addr
)) ||
741 (sk
->sk_bound_dev_if
&& sk
->sk_bound_dev_if
!= dif
) ||
742 (!ipv6_addr_any(&sk
->sk_v6_rcv_saddr
) &&
743 !ipv6_addr_equal(&sk
->sk_v6_rcv_saddr
, loc_addr
)))
745 if (!inet6_mc_check(sk
, loc_addr
, rmt_addr
))
750 static void flush_stack(struct sock
**stack
, unsigned int count
,
751 struct sk_buff
*skb
, unsigned int final
)
753 struct sk_buff
*skb1
= NULL
;
757 for (i
= 0; i
< count
; i
++) {
760 skb1
= (i
== final
) ? skb
: skb_clone(skb
, GFP_ATOMIC
);
762 atomic_inc(&sk
->sk_drops
);
763 UDP6_INC_STATS_BH(sock_net(sk
), UDP_MIB_RCVBUFERRORS
,
765 UDP6_INC_STATS_BH(sock_net(sk
), UDP_MIB_INERRORS
,
769 if (skb1
&& udpv6_queue_rcv_skb(sk
, skb1
) <= 0)
777 static void udp6_csum_zero_error(struct sk_buff
*skb
)
779 /* RFC 2460 section 8.1 says that we SHOULD log
780 * this error. Well, it is reasonable.
782 net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n",
783 &ipv6_hdr(skb
)->saddr
, ntohs(udp_hdr(skb
)->source
),
784 &ipv6_hdr(skb
)->daddr
, ntohs(udp_hdr(skb
)->dest
));
788 * Note: called only from the BH handler context,
789 * so we don't need to lock the hashes.
791 static int __udp6_lib_mcast_deliver(struct net
*net
, struct sk_buff
*skb
,
792 const struct in6_addr
*saddr
, const struct in6_addr
*daddr
,
793 struct udp_table
*udptable
, int proto
)
795 struct sock
*sk
, *stack
[256 / sizeof(struct sock
*)];
796 const struct udphdr
*uh
= udp_hdr(skb
);
797 struct hlist_nulls_node
*node
;
798 unsigned short hnum
= ntohs(uh
->dest
);
799 struct udp_hslot
*hslot
= udp_hashslot(udptable
, net
, hnum
);
800 int dif
= inet6_iif(skb
);
801 unsigned int count
= 0, offset
= offsetof(typeof(*sk
), sk_nulls_node
);
802 unsigned int hash2
= 0, hash2_any
= 0, use_hash2
= (hslot
->count
> 10);
803 bool inner_flushed
= false;
806 hash2_any
= udp6_portaddr_hash(net
, &in6addr_any
, hnum
) &
808 hash2
= udp6_portaddr_hash(net
, daddr
, hnum
) & udp_table
.mask
;
810 hslot
= &udp_table
.hash2
[hash2
];
811 offset
= offsetof(typeof(*sk
), __sk_common
.skc_portaddr_node
);
814 spin_lock(&hslot
->lock
);
815 sk_nulls_for_each_entry_offset(sk
, node
, &hslot
->head
, offset
) {
816 if (__udp_v6_is_mcast_sock(net
, sk
,
820 /* If zero checksum and no_check is not on for
821 * the socket then skip it.
823 (uh
->check
|| udp_sk(sk
)->no_check6_rx
)) {
824 if (unlikely(count
== ARRAY_SIZE(stack
))) {
825 flush_stack(stack
, count
, skb
, ~0);
826 inner_flushed
= true;
834 spin_unlock(&hslot
->lock
);
836 /* Also lookup *:port if we are using hash2 and haven't done so yet. */
837 if (use_hash2
&& hash2
!= hash2_any
) {
843 flush_stack(stack
, count
, skb
, count
- 1);
846 UDP6_INC_STATS_BH(net
, UDP_MIB_IGNOREDMULTI
,
847 proto
== IPPROTO_UDPLITE
);
853 int __udp6_lib_rcv(struct sk_buff
*skb
, struct udp_table
*udptable
,
856 struct net
*net
= dev_net(skb
->dev
);
859 const struct in6_addr
*saddr
, *daddr
;
862 if (!pskb_may_pull(skb
, sizeof(struct udphdr
)))
865 saddr
= &ipv6_hdr(skb
)->saddr
;
866 daddr
= &ipv6_hdr(skb
)->daddr
;
869 ulen
= ntohs(uh
->len
);
873 if (proto
== IPPROTO_UDP
) {
874 /* UDP validates ulen. */
876 /* Check for jumbo payload */
880 if (ulen
< sizeof(*uh
))
883 if (ulen
< skb
->len
) {
884 if (pskb_trim_rcsum(skb
, ulen
))
886 saddr
= &ipv6_hdr(skb
)->saddr
;
887 daddr
= &ipv6_hdr(skb
)->daddr
;
892 if (udp6_csum_init(skb
, uh
, proto
))
896 * Multicast receive code
898 if (ipv6_addr_is_multicast(daddr
))
899 return __udp6_lib_mcast_deliver(net
, skb
,
900 saddr
, daddr
, udptable
, proto
);
905 * check socket cache ... must talk to Alan about his plans
906 * for sock caches... i'll skip this for now.
908 sk
= __udp6_lib_lookup_skb(skb
, uh
->source
, uh
->dest
, udptable
);
912 if (!uh
->check
&& !udp_sk(sk
)->no_check6_rx
) {
914 udp6_csum_zero_error(skb
);
918 if (inet_get_convert_csum(sk
) && uh
->check
&& !IS_UDPLITE(sk
))
919 skb_checksum_try_convert(skb
, IPPROTO_UDP
, uh
->check
,
922 ret
= udpv6_queue_rcv_skb(sk
, skb
);
925 /* a return value > 0 means to resubmit the input */
933 udp6_csum_zero_error(skb
);
937 if (!xfrm6_policy_check(NULL
, XFRM_POLICY_IN
, skb
))
940 if (udp_lib_checksum_complete(skb
))
943 UDP6_INC_STATS_BH(net
, UDP_MIB_NOPORTS
, proto
== IPPROTO_UDPLITE
);
944 icmpv6_send(skb
, ICMPV6_DEST_UNREACH
, ICMPV6_PORT_UNREACH
, 0);
950 net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n",
951 proto
== IPPROTO_UDPLITE
? "-Lite" : "",
952 saddr
, ntohs(uh
->source
),
954 daddr
, ntohs(uh
->dest
));
957 UDP6_INC_STATS_BH(net
, UDP_MIB_CSUMERRORS
, proto
== IPPROTO_UDPLITE
);
959 UDP6_INC_STATS_BH(net
, UDP_MIB_INERRORS
, proto
== IPPROTO_UDPLITE
);
964 static __inline__
int udpv6_rcv(struct sk_buff
*skb
)
966 return __udp6_lib_rcv(skb
, &udp_table
, IPPROTO_UDP
);
970 * Throw away all pending data and cancel the corking. Socket is locked.
972 static void udp_v6_flush_pending_frames(struct sock
*sk
)
974 struct udp_sock
*up
= udp_sk(sk
);
976 if (up
->pending
== AF_INET
)
977 udp_flush_pending_frames(sk
);
978 else if (up
->pending
) {
981 ip6_flush_pending_frames(sk
);
986 * udp6_hwcsum_outgoing - handle outgoing HW checksumming
987 * @sk: socket we are sending on
988 * @skb: sk_buff containing the filled-in UDP header
989 * (checksum field must be zeroed out)
991 static void udp6_hwcsum_outgoing(struct sock
*sk
, struct sk_buff
*skb
,
992 const struct in6_addr
*saddr
,
993 const struct in6_addr
*daddr
, int len
)
996 struct udphdr
*uh
= udp_hdr(skb
);
997 struct sk_buff
*frags
= skb_shinfo(skb
)->frag_list
;
1001 /* Only one fragment on the socket. */
1002 skb
->csum_start
= skb_transport_header(skb
) - skb
->head
;
1003 skb
->csum_offset
= offsetof(struct udphdr
, check
);
1004 uh
->check
= ~csum_ipv6_magic(saddr
, daddr
, len
, IPPROTO_UDP
, 0);
1007 * HW-checksum won't work as there are two or more
1008 * fragments on the socket so that all csums of sk_buffs
1009 * should be together
1011 offset
= skb_transport_offset(skb
);
1012 skb
->csum
= skb_checksum(skb
, offset
, skb
->len
- offset
, 0);
1014 skb
->ip_summed
= CHECKSUM_NONE
;
1017 csum
= csum_add(csum
, frags
->csum
);
1018 } while ((frags
= frags
->next
));
1020 uh
->check
= csum_ipv6_magic(saddr
, daddr
, len
, IPPROTO_UDP
,
1023 uh
->check
= CSUM_MANGLED_0
;
1031 static int udp_v6_send_skb(struct sk_buff
*skb
, struct flowi6
*fl6
)
1033 struct sock
*sk
= skb
->sk
;
1036 int is_udplite
= IS_UDPLITE(sk
);
1038 int offset
= skb_transport_offset(skb
);
1039 int len
= skb
->len
- offset
;
1042 * Create a UDP header
1045 uh
->source
= fl6
->fl6_sport
;
1046 uh
->dest
= fl6
->fl6_dport
;
1047 uh
->len
= htons(len
);
1051 csum
= udplite_csum(skb
);
1052 else if (udp_sk(sk
)->no_check6_tx
) { /* UDP csum disabled */
1053 skb
->ip_summed
= CHECKSUM_NONE
;
1055 } else if (skb
->ip_summed
== CHECKSUM_PARTIAL
) { /* UDP hardware csum */
1056 udp6_hwcsum_outgoing(sk
, skb
, &fl6
->saddr
, &fl6
->daddr
, len
);
1059 csum
= udp_csum(skb
);
1061 /* add protocol-dependent pseudo-header */
1062 uh
->check
= csum_ipv6_magic(&fl6
->saddr
, &fl6
->daddr
,
1063 len
, fl6
->flowi6_proto
, csum
);
1065 uh
->check
= CSUM_MANGLED_0
;
1068 err
= ip6_send_skb(skb
);
1070 if (err
== -ENOBUFS
&& !inet6_sk(sk
)->recverr
) {
1071 UDP6_INC_STATS_USER(sock_net(sk
),
1072 UDP_MIB_SNDBUFERRORS
, is_udplite
);
1076 UDP6_INC_STATS_USER(sock_net(sk
),
1077 UDP_MIB_OUTDATAGRAMS
, is_udplite
);
1081 static int udp_v6_push_pending_frames(struct sock
*sk
)
1083 struct sk_buff
*skb
;
1084 struct udp_sock
*up
= udp_sk(sk
);
1088 if (up
->pending
== AF_INET
)
1089 return udp_push_pending_frames(sk
);
1091 /* ip6_finish_skb will release the cork, so make a copy of
1094 fl6
= inet_sk(sk
)->cork
.fl
.u
.ip6
;
1096 skb
= ip6_finish_skb(sk
);
1100 err
= udp_v6_send_skb(skb
, &fl6
);
1108 int udpv6_sendmsg(struct sock
*sk
, struct msghdr
*msg
, size_t len
)
1110 struct ipv6_txoptions opt_space
;
1111 struct udp_sock
*up
= udp_sk(sk
);
1112 struct inet_sock
*inet
= inet_sk(sk
);
1113 struct ipv6_pinfo
*np
= inet6_sk(sk
);
1114 DECLARE_SOCKADDR(struct sockaddr_in6
*, sin6
, msg
->msg_name
);
1115 struct in6_addr
*daddr
, *final_p
, final
;
1116 struct ipv6_txoptions
*opt
= NULL
;
1117 struct ipv6_txoptions
*opt_to_free
= NULL
;
1118 struct ip6_flowlabel
*flowlabel
= NULL
;
1120 struct dst_entry
*dst
;
1121 int addr_len
= msg
->msg_namelen
;
1126 int corkreq
= up
->corkflag
|| msg
->msg_flags
&MSG_MORE
;
1129 int is_udplite
= IS_UDPLITE(sk
);
1130 int (*getfrag
)(void *, char *, int, int, int, struct sk_buff
*);
1132 /* destination address check */
1134 if (addr_len
< offsetof(struct sockaddr
, sa_data
))
1137 switch (sin6
->sin6_family
) {
1139 if (addr_len
< SIN6_LEN_RFC2133
)
1141 daddr
= &sin6
->sin6_addr
;
1144 goto do_udp_sendmsg
;
1146 msg
->msg_name
= sin6
= NULL
;
1147 msg
->msg_namelen
= addr_len
= 0;
1153 } else if (!up
->pending
) {
1154 if (sk
->sk_state
!= TCP_ESTABLISHED
)
1155 return -EDESTADDRREQ
;
1156 daddr
= &sk
->sk_v6_daddr
;
1161 if (ipv6_addr_v4mapped(daddr
)) {
1162 struct sockaddr_in sin
;
1163 sin
.sin_family
= AF_INET
;
1164 sin
.sin_port
= sin6
? sin6
->sin6_port
: inet
->inet_dport
;
1165 sin
.sin_addr
.s_addr
= daddr
->s6_addr32
[3];
1166 msg
->msg_name
= &sin
;
1167 msg
->msg_namelen
= sizeof(sin
);
1169 if (__ipv6_only_sock(sk
))
1170 return -ENETUNREACH
;
1171 return udp_sendmsg(sk
, msg
, len
);
1175 if (up
->pending
== AF_INET
)
1176 return udp_sendmsg(sk
, msg
, len
);
1178 /* Rough check on arithmetic overflow,
1179 better check is made in ip6_append_data().
1181 if (len
> INT_MAX
- sizeof(struct udphdr
))
1184 getfrag
= is_udplite
? udplite_getfrag
: ip_generic_getfrag
;
1187 * There are pending frames.
1188 * The socket lock must be held while it's corked.
1191 if (likely(up
->pending
)) {
1192 if (unlikely(up
->pending
!= AF_INET6
)) {
1194 return -EAFNOSUPPORT
;
1197 goto do_append_data
;
1201 ulen
+= sizeof(struct udphdr
);
1203 memset(&fl6
, 0, sizeof(fl6
));
1206 if (sin6
->sin6_port
== 0)
1209 fl6
.fl6_dport
= sin6
->sin6_port
;
1210 daddr
= &sin6
->sin6_addr
;
1213 fl6
.flowlabel
= sin6
->sin6_flowinfo
&IPV6_FLOWINFO_MASK
;
1214 if (fl6
.flowlabel
&IPV6_FLOWLABEL_MASK
) {
1215 flowlabel
= fl6_sock_lookup(sk
, fl6
.flowlabel
);
1222 * Otherwise it will be difficult to maintain
1225 if (sk
->sk_state
== TCP_ESTABLISHED
&&
1226 ipv6_addr_equal(daddr
, &sk
->sk_v6_daddr
))
1227 daddr
= &sk
->sk_v6_daddr
;
1229 if (addr_len
>= sizeof(struct sockaddr_in6
) &&
1230 sin6
->sin6_scope_id
&&
1231 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr
)))
1232 fl6
.flowi6_oif
= sin6
->sin6_scope_id
;
1234 if (sk
->sk_state
!= TCP_ESTABLISHED
)
1235 return -EDESTADDRREQ
;
1237 fl6
.fl6_dport
= inet
->inet_dport
;
1238 daddr
= &sk
->sk_v6_daddr
;
1239 fl6
.flowlabel
= np
->flow_label
;
1243 if (!fl6
.flowi6_oif
)
1244 fl6
.flowi6_oif
= sk
->sk_bound_dev_if
;
1246 if (!fl6
.flowi6_oif
)
1247 fl6
.flowi6_oif
= np
->sticky_pktinfo
.ipi6_ifindex
;
1249 fl6
.flowi6_mark
= sk
->sk_mark
;
1251 if (msg
->msg_controllen
) {
1253 memset(opt
, 0, sizeof(struct ipv6_txoptions
));
1254 opt
->tot_len
= sizeof(*opt
);
1256 err
= ip6_datagram_send_ctl(sock_net(sk
), sk
, msg
, &fl6
, opt
,
1257 &hlimit
, &tclass
, &dontfrag
);
1259 fl6_sock_release(flowlabel
);
1262 if ((fl6
.flowlabel
&IPV6_FLOWLABEL_MASK
) && !flowlabel
) {
1263 flowlabel
= fl6_sock_lookup(sk
, fl6
.flowlabel
);
1267 if (!(opt
->opt_nflen
|opt
->opt_flen
))
1272 opt
= txopt_get(np
);
1276 opt
= fl6_merge_options(&opt_space
, flowlabel
, opt
);
1277 opt
= ipv6_fixup_options(&opt_space
, opt
);
1279 fl6
.flowi6_proto
= sk
->sk_protocol
;
1280 if (!ipv6_addr_any(daddr
))
1283 fl6
.daddr
.s6_addr
[15] = 0x1; /* :: means loopback (BSD'ism) */
1284 if (ipv6_addr_any(&fl6
.saddr
) && !ipv6_addr_any(&np
->saddr
))
1285 fl6
.saddr
= np
->saddr
;
1286 fl6
.fl6_sport
= inet
->inet_sport
;
1288 final_p
= fl6_update_dst(&fl6
, opt
, &final
);
1292 if (!fl6
.flowi6_oif
&& ipv6_addr_is_multicast(&fl6
.daddr
)) {
1293 fl6
.flowi6_oif
= np
->mcast_oif
;
1295 } else if (!fl6
.flowi6_oif
)
1296 fl6
.flowi6_oif
= np
->ucast_oif
;
1298 security_sk_classify_flow(sk
, flowi6_to_flowi(&fl6
));
1300 dst
= ip6_sk_dst_lookup_flow(sk
, &fl6
, final_p
);
1308 hlimit
= ip6_sk_dst_hoplimit(np
, &fl6
, dst
);
1311 tclass
= np
->tclass
;
1313 if (msg
->msg_flags
&MSG_CONFIRM
)
1317 /* Lockless fast path for the non-corking case */
1319 struct sk_buff
*skb
;
1321 skb
= ip6_make_skb(sk
, getfrag
, msg
, ulen
,
1322 sizeof(struct udphdr
), hlimit
, tclass
, opt
,
1323 &fl6
, (struct rt6_info
*)dst
,
1324 msg
->msg_flags
, dontfrag
);
1326 if (!IS_ERR_OR_NULL(skb
))
1327 err
= udp_v6_send_skb(skb
, &fl6
);
1332 if (unlikely(up
->pending
)) {
1333 /* The socket is already corked while preparing it. */
1334 /* ... which is an evident application bug. --ANK */
1337 net_dbg_ratelimited("udp cork app bug 2\n");
1342 up
->pending
= AF_INET6
;
1346 dontfrag
= np
->dontfrag
;
1348 err
= ip6_append_data(sk
, getfrag
, msg
, ulen
,
1349 sizeof(struct udphdr
), hlimit
, tclass
, opt
, &fl6
,
1350 (struct rt6_info
*)dst
,
1351 corkreq
? msg
->msg_flags
|MSG_MORE
: msg
->msg_flags
, dontfrag
);
1353 udp_v6_flush_pending_frames(sk
);
1355 err
= udp_v6_push_pending_frames(sk
);
1356 else if (unlikely(skb_queue_empty(&sk
->sk_write_queue
)))
1360 err
= np
->recverr
? net_xmit_errno(err
) : 0;
1366 ip6_dst_store(sk
, dst
,
1367 ipv6_addr_equal(&fl6
.daddr
, &sk
->sk_v6_daddr
) ?
1368 &sk
->sk_v6_daddr
: NULL
,
1369 #ifdef CONFIG_IPV6_SUBTREES
1370 ipv6_addr_equal(&fl6
.saddr
, &np
->saddr
) ?
1382 fl6_sock_release(flowlabel
);
1383 txopt_put(opt_to_free
);
1387 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
1388 * ENOBUFS might not be good (it's not tunable per se), but otherwise
1389 * we don't have a good statistic (IpOutDiscards but it can be too many
1390 * things). We could add another new stat but at least for now that
1391 * seems like overkill.
1393 if (err
== -ENOBUFS
|| test_bit(SOCK_NOSPACE
, &sk
->sk_socket
->flags
)) {
1394 UDP6_INC_STATS_USER(sock_net(sk
),
1395 UDP_MIB_SNDBUFERRORS
, is_udplite
);
1401 if (!(msg
->msg_flags
&MSG_PROBE
) || len
)
1402 goto back_from_confirm
;
1407 void udpv6_destroy_sock(struct sock
*sk
)
1409 struct udp_sock
*up
= udp_sk(sk
);
1411 udp_v6_flush_pending_frames(sk
);
1414 if (static_key_false(&udpv6_encap_needed
) && up
->encap_type
) {
1415 void (*encap_destroy
)(struct sock
*sk
);
1416 encap_destroy
= ACCESS_ONCE(up
->encap_destroy
);
1421 inet6_destroy_sock(sk
);
1425 * Socket option code for UDP
1427 int udpv6_setsockopt(struct sock
*sk
, int level
, int optname
,
1428 char __user
*optval
, unsigned int optlen
)
1430 if (level
== SOL_UDP
|| level
== SOL_UDPLITE
)
1431 return udp_lib_setsockopt(sk
, level
, optname
, optval
, optlen
,
1432 udp_v6_push_pending_frames
);
1433 return ipv6_setsockopt(sk
, level
, optname
, optval
, optlen
);
1436 #ifdef CONFIG_COMPAT
1437 int compat_udpv6_setsockopt(struct sock
*sk
, int level
, int optname
,
1438 char __user
*optval
, unsigned int optlen
)
1440 if (level
== SOL_UDP
|| level
== SOL_UDPLITE
)
1441 return udp_lib_setsockopt(sk
, level
, optname
, optval
, optlen
,
1442 udp_v6_push_pending_frames
);
1443 return compat_ipv6_setsockopt(sk
, level
, optname
, optval
, optlen
);
1447 int udpv6_getsockopt(struct sock
*sk
, int level
, int optname
,
1448 char __user
*optval
, int __user
*optlen
)
1450 if (level
== SOL_UDP
|| level
== SOL_UDPLITE
)
1451 return udp_lib_getsockopt(sk
, level
, optname
, optval
, optlen
);
1452 return ipv6_getsockopt(sk
, level
, optname
, optval
, optlen
);
1455 #ifdef CONFIG_COMPAT
1456 int compat_udpv6_getsockopt(struct sock
*sk
, int level
, int optname
,
1457 char __user
*optval
, int __user
*optlen
)
1459 if (level
== SOL_UDP
|| level
== SOL_UDPLITE
)
1460 return udp_lib_getsockopt(sk
, level
, optname
, optval
, optlen
);
1461 return compat_ipv6_getsockopt(sk
, level
, optname
, optval
, optlen
);
1465 static const struct inet6_protocol udpv6_protocol
= {
1466 .handler
= udpv6_rcv
,
1467 .err_handler
= udpv6_err
,
1468 .flags
= INET6_PROTO_NOPOLICY
|INET6_PROTO_FINAL
,
1471 /* ------------------------------------------------------------------------ */
1472 #ifdef CONFIG_PROC_FS
1473 int udp6_seq_show(struct seq_file
*seq
, void *v
)
1475 if (v
== SEQ_START_TOKEN
) {
1476 seq_puts(seq
, IPV6_SEQ_DGRAM_HEADER
);
1478 int bucket
= ((struct udp_iter_state
*)seq
->private)->bucket
;
1479 struct inet_sock
*inet
= inet_sk(v
);
1480 __u16 srcp
= ntohs(inet
->inet_sport
);
1481 __u16 destp
= ntohs(inet
->inet_dport
);
1482 ip6_dgram_sock_seq_show(seq
, v
, srcp
, destp
, bucket
);
1487 static const struct file_operations udp6_afinfo_seq_fops
= {
1488 .owner
= THIS_MODULE
,
1489 .open
= udp_seq_open
,
1491 .llseek
= seq_lseek
,
1492 .release
= seq_release_net
1495 static struct udp_seq_afinfo udp6_seq_afinfo
= {
1498 .udp_table
= &udp_table
,
1499 .seq_fops
= &udp6_afinfo_seq_fops
,
1501 .show
= udp6_seq_show
,
1505 int __net_init
udp6_proc_init(struct net
*net
)
1507 return udp_proc_register(net
, &udp6_seq_afinfo
);
1510 void udp6_proc_exit(struct net
*net
)
1512 udp_proc_unregister(net
, &udp6_seq_afinfo
);
1514 #endif /* CONFIG_PROC_FS */
1516 void udp_v6_clear_sk(struct sock
*sk
, int size
)
1518 struct inet_sock
*inet
= inet_sk(sk
);
1520 /* we do not want to clear pinet6 field, because of RCU lookups */
1521 sk_prot_clear_portaddr_nulls(sk
, offsetof(struct inet_sock
, pinet6
));
1523 size
-= offsetof(struct inet_sock
, pinet6
) + sizeof(inet
->pinet6
);
1524 memset(&inet
->pinet6
+ 1, 0, size
);
1527 /* ------------------------------------------------------------------------ */
1529 struct proto udpv6_prot
= {
1531 .owner
= THIS_MODULE
,
1532 .close
= udp_lib_close
,
1533 .connect
= ip6_datagram_connect
,
1534 .disconnect
= udp_disconnect
,
1536 .destroy
= udpv6_destroy_sock
,
1537 .setsockopt
= udpv6_setsockopt
,
1538 .getsockopt
= udpv6_getsockopt
,
1539 .sendmsg
= udpv6_sendmsg
,
1540 .recvmsg
= udpv6_recvmsg
,
1541 .backlog_rcv
= __udpv6_queue_rcv_skb
,
1542 .hash
= udp_lib_hash
,
1543 .unhash
= udp_lib_unhash
,
1544 .rehash
= udp_v6_rehash
,
1545 .get_port
= udp_v6_get_port
,
1546 .memory_allocated
= &udp_memory_allocated
,
1547 .sysctl_mem
= sysctl_udp_mem
,
1548 .sysctl_wmem
= &sysctl_udp_wmem_min
,
1549 .sysctl_rmem
= &sysctl_udp_rmem_min
,
1550 .obj_size
= sizeof(struct udp6_sock
),
1551 .slab_flags
= SLAB_DESTROY_BY_RCU
,
1552 .h
.udp_table
= &udp_table
,
1553 #ifdef CONFIG_COMPAT
1554 .compat_setsockopt
= compat_udpv6_setsockopt
,
1555 .compat_getsockopt
= compat_udpv6_getsockopt
,
1557 .clear_sk
= udp_v6_clear_sk
,
1560 static struct inet_protosw udpv6_protosw
= {
1562 .protocol
= IPPROTO_UDP
,
1563 .prot
= &udpv6_prot
,
1564 .ops
= &inet6_dgram_ops
,
1565 .flags
= INET_PROTOSW_PERMANENT
,
1568 int __init
udpv6_init(void)
1572 ret
= inet6_add_protocol(&udpv6_protocol
, IPPROTO_UDP
);
1576 ret
= inet6_register_protosw(&udpv6_protosw
);
1578 goto out_udpv6_protocol
;
1583 inet6_del_protocol(&udpv6_protocol
, IPPROTO_UDP
);
1587 void udpv6_exit(void)
1589 inet6_unregister_protosw(&udpv6_protosw
);
1590 inet6_del_protocol(&udpv6_protocol
, IPPROTO_UDP
);