3 * Linux INET6 implementation
6 * Pedro Roque <roque@di.fc.ul.pt>
8 * Based on linux/ipv4/udp.c
11 * Hideaki YOSHIFUJI : sin6_scope_id support
12 * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which
13 * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind
14 * a single port at the same time.
15 * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data
16 * YOSHIFUJI Hideaki @USAGI: convert /proc/net/udp6 to seq_file.
18 * This program is free software; you can redistribute it and/or
19 * modify it under the terms of the GNU General Public License
20 * as published by the Free Software Foundation; either version
21 * 2 of the License, or (at your option) any later version.
24 #include <linux/errno.h>
25 #include <linux/types.h>
26 #include <linux/socket.h>
27 #include <linux/sockios.h>
28 #include <linux/net.h>
29 #include <linux/in6.h>
30 #include <linux/netdevice.h>
31 #include <linux/if_arp.h>
32 #include <linux/ipv6.h>
33 #include <linux/icmpv6.h>
34 #include <linux/init.h>
35 #include <linux/module.h>
36 #include <linux/skbuff.h>
37 #include <linux/slab.h>
38 #include <asm/uaccess.h>
40 #include <net/ndisc.h>
41 #include <net/protocol.h>
42 #include <net/transp_v6.h>
43 #include <net/ip6_route.h>
45 #include <net/tcp_states.h>
46 #include <net/ip6_checksum.h>
48 #include <net/inet6_hashtables.h>
49 #include <net/busy_poll.h>
51 #include <linux/proc_fs.h>
52 #include <linux/seq_file.h>
53 #include <trace/events/skb.h>
56 static unsigned int udp6_ehashfn(struct net
*net
,
57 const struct in6_addr
*laddr
,
59 const struct in6_addr
*faddr
,
62 static u32 udp6_ehash_secret __read_mostly
;
63 static u32 udp_ipv6_hash_secret __read_mostly
;
67 net_get_random_once(&udp6_ehash_secret
,
68 sizeof(udp6_ehash_secret
));
69 net_get_random_once(&udp_ipv6_hash_secret
,
70 sizeof(udp_ipv6_hash_secret
));
72 lhash
= (__force u32
)laddr
->s6_addr32
[3];
73 fhash
= __ipv6_addr_jhash(faddr
, udp_ipv6_hash_secret
);
75 return __inet6_ehashfn(lhash
, lport
, fhash
, fport
,
76 udp_ipv6_hash_secret
+ net_hash_mix(net
));
79 int ipv6_rcv_saddr_equal(const struct sock
*sk
, const struct sock
*sk2
)
81 const struct in6_addr
*sk2_rcv_saddr6
= inet6_rcv_saddr(sk2
);
82 int sk2_ipv6only
= inet_v6_ipv6only(sk2
);
83 int addr_type
= ipv6_addr_type(&sk
->sk_v6_rcv_saddr
);
84 int addr_type2
= sk2_rcv_saddr6
? ipv6_addr_type(sk2_rcv_saddr6
) : IPV6_ADDR_MAPPED
;
86 /* if both are mapped, treat as IPv4 */
87 if (addr_type
== IPV6_ADDR_MAPPED
&& addr_type2
== IPV6_ADDR_MAPPED
)
88 return (!sk2_ipv6only
&&
89 (!sk
->sk_rcv_saddr
|| !sk2
->sk_rcv_saddr
||
90 sk
->sk_rcv_saddr
== sk2
->sk_rcv_saddr
));
92 if (addr_type2
== IPV6_ADDR_ANY
&&
93 !(sk2_ipv6only
&& addr_type
== IPV6_ADDR_MAPPED
))
96 if (addr_type
== IPV6_ADDR_ANY
&&
97 !(ipv6_only_sock(sk
) && addr_type2
== IPV6_ADDR_MAPPED
))
100 if (sk2_rcv_saddr6
&&
101 ipv6_addr_equal(&sk
->sk_v6_rcv_saddr
, sk2_rcv_saddr6
))
107 static unsigned int udp6_portaddr_hash(struct net
*net
,
108 const struct in6_addr
*addr6
,
111 unsigned int hash
, mix
= net_hash_mix(net
);
113 if (ipv6_addr_any(addr6
))
114 hash
= jhash_1word(0, mix
);
115 else if (ipv6_addr_v4mapped(addr6
))
116 hash
= jhash_1word((__force u32
)addr6
->s6_addr32
[3], mix
);
118 hash
= jhash2((__force u32
*)addr6
->s6_addr32
, 4, mix
);
124 int udp_v6_get_port(struct sock
*sk
, unsigned short snum
)
126 unsigned int hash2_nulladdr
=
127 udp6_portaddr_hash(sock_net(sk
), &in6addr_any
, snum
);
128 unsigned int hash2_partial
=
129 udp6_portaddr_hash(sock_net(sk
), &sk
->sk_v6_rcv_saddr
, 0);
131 /* precompute partial secondary hash */
132 udp_sk(sk
)->udp_portaddr_hash
= hash2_partial
;
133 return udp_lib_get_port(sk
, snum
, ipv6_rcv_saddr_equal
, hash2_nulladdr
);
136 static void udp_v6_rehash(struct sock
*sk
)
138 u16 new_hash
= udp6_portaddr_hash(sock_net(sk
),
139 &sk
->sk_v6_rcv_saddr
,
140 inet_sk(sk
)->inet_num
);
142 udp_lib_rehash(sk
, new_hash
);
145 static inline int compute_score(struct sock
*sk
, struct net
*net
,
147 const struct in6_addr
*saddr
, __be16 sport
,
148 const struct in6_addr
*daddr
, __be16 dport
,
152 struct inet_sock
*inet
;
154 if (!net_eq(sock_net(sk
), net
) ||
155 udp_sk(sk
)->udp_port_hash
!= hnum
||
156 sk
->sk_family
!= PF_INET6
)
162 if (inet
->inet_dport
) {
163 if (inet
->inet_dport
!= sport
)
168 if (!ipv6_addr_any(&sk
->sk_v6_rcv_saddr
)) {
169 if (!ipv6_addr_equal(&sk
->sk_v6_rcv_saddr
, daddr
))
174 if (!ipv6_addr_any(&sk
->sk_v6_daddr
)) {
175 if (!ipv6_addr_equal(&sk
->sk_v6_daddr
, saddr
))
180 if (sk
->sk_bound_dev_if
) {
181 if (sk
->sk_bound_dev_if
!= dif
)
189 #define SCORE2_MAX (1 + 1 + 1)
190 static inline int compute_score2(struct sock
*sk
, struct net
*net
,
191 const struct in6_addr
*saddr
, __be16 sport
,
192 const struct in6_addr
*daddr
,
193 unsigned short hnum
, int dif
)
196 struct inet_sock
*inet
;
198 if (!net_eq(sock_net(sk
), net
) ||
199 udp_sk(sk
)->udp_port_hash
!= hnum
||
200 sk
->sk_family
!= PF_INET6
)
203 if (!ipv6_addr_equal(&sk
->sk_v6_rcv_saddr
, daddr
))
209 if (inet
->inet_dport
) {
210 if (inet
->inet_dport
!= sport
)
215 if (!ipv6_addr_any(&sk
->sk_v6_daddr
)) {
216 if (!ipv6_addr_equal(&sk
->sk_v6_daddr
, saddr
))
221 if (sk
->sk_bound_dev_if
) {
222 if (sk
->sk_bound_dev_if
!= dif
)
230 /* called with read_rcu_lock() */
231 static struct sock
*udp6_lib_lookup2(struct net
*net
,
232 const struct in6_addr
*saddr
, __be16 sport
,
233 const struct in6_addr
*daddr
, unsigned int hnum
, int dif
,
234 struct udp_hslot
*hslot2
, unsigned int slot2
)
236 struct sock
*sk
, *result
;
237 struct hlist_nulls_node
*node
;
238 int score
, badness
, matches
= 0, reuseport
= 0;
244 udp_portaddr_for_each_entry_rcu(sk
, node
, &hslot2
->head
) {
245 score
= compute_score2(sk
, net
, saddr
, sport
,
247 if (score
> badness
) {
250 reuseport
= sk
->sk_reuseport
;
252 hash
= udp6_ehashfn(net
, daddr
, hnum
,
255 } else if (score
== SCORE2_MAX
)
257 } else if (score
== badness
&& reuseport
) {
259 if (reciprocal_scale(hash
, matches
) == 0)
261 hash
= next_pseudo_random32(hash
);
265 * if the nulls value we got at the end of this lookup is
266 * not the expected one, we must restart lookup.
267 * We probably met an item that was moved to another chain.
269 if (get_nulls_value(node
) != slot2
)
274 if (unlikely(!atomic_inc_not_zero_hint(&result
->sk_refcnt
, 2)))
276 else if (unlikely(compute_score2(result
, net
, saddr
, sport
,
277 daddr
, hnum
, dif
) < badness
)) {
285 struct sock
*__udp6_lib_lookup(struct net
*net
,
286 const struct in6_addr
*saddr
, __be16 sport
,
287 const struct in6_addr
*daddr
, __be16 dport
,
288 int dif
, struct udp_table
*udptable
)
290 struct sock
*sk
, *result
;
291 struct hlist_nulls_node
*node
;
292 unsigned short hnum
= ntohs(dport
);
293 unsigned int hash2
, slot2
, slot
= udp_hashfn(net
, hnum
, udptable
->mask
);
294 struct udp_hslot
*hslot2
, *hslot
= &udptable
->hash
[slot
];
295 int score
, badness
, matches
= 0, reuseport
= 0;
299 if (hslot
->count
> 10) {
300 hash2
= udp6_portaddr_hash(net
, daddr
, hnum
);
301 slot2
= hash2
& udptable
->mask
;
302 hslot2
= &udptable
->hash2
[slot2
];
303 if (hslot
->count
< hslot2
->count
)
306 result
= udp6_lib_lookup2(net
, saddr
, sport
,
310 hash2
= udp6_portaddr_hash(net
, &in6addr_any
, hnum
);
311 slot2
= hash2
& udptable
->mask
;
312 hslot2
= &udptable
->hash2
[slot2
];
313 if (hslot
->count
< hslot2
->count
)
316 result
= udp6_lib_lookup2(net
, saddr
, sport
,
317 &in6addr_any
, hnum
, dif
,
326 sk_nulls_for_each_rcu(sk
, node
, &hslot
->head
) {
327 score
= compute_score(sk
, net
, hnum
, saddr
, sport
, daddr
, dport
, dif
);
328 if (score
> badness
) {
331 reuseport
= sk
->sk_reuseport
;
333 hash
= udp6_ehashfn(net
, daddr
, hnum
,
337 } else if (score
== badness
&& reuseport
) {
339 if (reciprocal_scale(hash
, matches
) == 0)
341 hash
= next_pseudo_random32(hash
);
345 * if the nulls value we got at the end of this lookup is
346 * not the expected one, we must restart lookup.
347 * We probably met an item that was moved to another chain.
349 if (get_nulls_value(node
) != slot
)
353 if (unlikely(!atomic_inc_not_zero_hint(&result
->sk_refcnt
, 2)))
355 else if (unlikely(compute_score(result
, net
, hnum
, saddr
, sport
,
356 daddr
, dport
, dif
) < badness
)) {
364 EXPORT_SYMBOL_GPL(__udp6_lib_lookup
);
366 static struct sock
*__udp6_lib_lookup_skb(struct sk_buff
*skb
,
367 __be16 sport
, __be16 dport
,
368 struct udp_table
*udptable
)
371 const struct ipv6hdr
*iph
= ipv6_hdr(skb
);
373 sk
= skb_steal_sock(skb
);
376 return __udp6_lib_lookup(dev_net(skb_dst(skb
)->dev
), &iph
->saddr
, sport
,
377 &iph
->daddr
, dport
, inet6_iif(skb
),
381 struct sock
*udp6_lib_lookup(struct net
*net
, const struct in6_addr
*saddr
, __be16 sport
,
382 const struct in6_addr
*daddr
, __be16 dport
, int dif
)
384 return __udp6_lib_lookup(net
, saddr
, sport
, daddr
, dport
, dif
, &udp_table
);
386 EXPORT_SYMBOL_GPL(udp6_lib_lookup
);
390 * This should be easy, if there is something there we
391 * return it, otherwise we block.
394 int udpv6_recvmsg(struct sock
*sk
, struct msghdr
*msg
, size_t len
,
395 int noblock
, int flags
, int *addr_len
)
397 struct ipv6_pinfo
*np
= inet6_sk(sk
);
398 struct inet_sock
*inet
= inet_sk(sk
);
400 unsigned int ulen
, copied
;
403 int is_udplite
= IS_UDPLITE(sk
);
407 if (flags
& MSG_ERRQUEUE
)
408 return ipv6_recv_error(sk
, msg
, len
, addr_len
);
410 if (np
->rxpmtu
&& np
->rxopt
.bits
.rxpmtu
)
411 return ipv6_recv_rxpmtu(sk
, msg
, len
, addr_len
);
414 skb
= __skb_recv_datagram(sk
, flags
| (noblock
? MSG_DONTWAIT
: 0),
415 &peeked
, &off
, &err
);
419 ulen
= skb
->len
- sizeof(struct udphdr
);
423 else if (copied
< ulen
)
424 msg
->msg_flags
|= MSG_TRUNC
;
426 is_udp4
= (skb
->protocol
== htons(ETH_P_IP
));
429 * If checksum is needed at all, try to do it while copying the
430 * data. If the data is truncated, or if we only want a partial
431 * coverage checksum (UDP-Lite), do it before the copy.
434 if (copied
< ulen
|| UDP_SKB_CB(skb
)->partial_cov
) {
435 if (udp_lib_checksum_complete(skb
))
439 if (skb_csum_unnecessary(skb
))
440 err
= skb_copy_datagram_msg(skb
, sizeof(struct udphdr
),
443 err
= skb_copy_and_csum_datagram_msg(skb
, sizeof(struct udphdr
), msg
);
448 trace_kfree_skb(skb
, udpv6_recvmsg
);
450 atomic_inc(&sk
->sk_drops
);
452 UDP_INC_STATS_USER(sock_net(sk
),
456 UDP6_INC_STATS_USER(sock_net(sk
),
464 UDP_INC_STATS_USER(sock_net(sk
),
465 UDP_MIB_INDATAGRAMS
, is_udplite
);
467 UDP6_INC_STATS_USER(sock_net(sk
),
468 UDP_MIB_INDATAGRAMS
, is_udplite
);
471 sock_recv_ts_and_drops(msg
, sk
, skb
);
473 /* Copy the address. */
475 DECLARE_SOCKADDR(struct sockaddr_in6
*, sin6
, msg
->msg_name
);
476 sin6
->sin6_family
= AF_INET6
;
477 sin6
->sin6_port
= udp_hdr(skb
)->source
;
478 sin6
->sin6_flowinfo
= 0;
481 ipv6_addr_set_v4mapped(ip_hdr(skb
)->saddr
,
483 sin6
->sin6_scope_id
= 0;
485 sin6
->sin6_addr
= ipv6_hdr(skb
)->saddr
;
486 sin6
->sin6_scope_id
=
487 ipv6_iface_scope_id(&sin6
->sin6_addr
,
490 *addr_len
= sizeof(*sin6
);
494 ip6_datagram_recv_common_ctl(sk
, msg
, skb
);
497 if (inet
->cmsg_flags
)
498 ip_cmsg_recv(msg
, skb
);
501 ip6_datagram_recv_specific_ctl(sk
, msg
, skb
);
505 if (flags
& MSG_TRUNC
)
509 skb_free_datagram_locked(sk
, skb
);
514 slow
= lock_sock_fast(sk
);
515 if (!skb_kill_datagram(sk
, skb
, flags
)) {
517 UDP_INC_STATS_USER(sock_net(sk
),
518 UDP_MIB_CSUMERRORS
, is_udplite
);
519 UDP_INC_STATS_USER(sock_net(sk
),
520 UDP_MIB_INERRORS
, is_udplite
);
522 UDP6_INC_STATS_USER(sock_net(sk
),
523 UDP_MIB_CSUMERRORS
, is_udplite
);
524 UDP6_INC_STATS_USER(sock_net(sk
),
525 UDP_MIB_INERRORS
, is_udplite
);
528 unlock_sock_fast(sk
, slow
);
533 /* starting over for a new packet */
534 msg
->msg_flags
&= ~MSG_TRUNC
;
538 void __udp6_lib_err(struct sk_buff
*skb
, struct inet6_skb_parm
*opt
,
539 u8 type
, u8 code
, int offset
, __be32 info
,
540 struct udp_table
*udptable
)
542 struct ipv6_pinfo
*np
;
543 const struct ipv6hdr
*hdr
= (const struct ipv6hdr
*)skb
->data
;
544 const struct in6_addr
*saddr
= &hdr
->saddr
;
545 const struct in6_addr
*daddr
= &hdr
->daddr
;
546 struct udphdr
*uh
= (struct udphdr
*)(skb
->data
+offset
);
549 struct net
*net
= dev_net(skb
->dev
);
551 sk
= __udp6_lib_lookup(net
, daddr
, uh
->dest
,
552 saddr
, uh
->source
, inet6_iif(skb
), udptable
);
554 ICMP6_INC_STATS_BH(net
, __in6_dev_get(skb
->dev
),
559 if (type
== ICMPV6_PKT_TOOBIG
) {
560 if (!ip6_sk_accept_pmtu(sk
))
562 ip6_sk_update_pmtu(skb
, sk
, info
);
564 if (type
== NDISC_REDIRECT
) {
565 ip6_sk_redirect(skb
, sk
);
571 if (!icmpv6_err_convert(type
, code
, &err
) && !np
->recverr
)
574 if (sk
->sk_state
!= TCP_ESTABLISHED
&& !np
->recverr
)
578 ipv6_icmp_error(sk
, skb
, err
, uh
->dest
, ntohl(info
), (u8
*)(uh
+1));
581 sk
->sk_error_report(sk
);
586 static int __udpv6_queue_rcv_skb(struct sock
*sk
, struct sk_buff
*skb
)
590 if (!ipv6_addr_any(&sk
->sk_v6_daddr
)) {
591 sock_rps_save_rxhash(sk
, skb
);
592 sk_mark_napi_id(sk
, skb
);
593 sk_incoming_cpu_update(sk
);
596 rc
= sock_queue_rcv_skb(sk
, skb
);
598 int is_udplite
= IS_UDPLITE(sk
);
600 /* Note that an ENOMEM error is charged twice */
602 UDP6_INC_STATS_BH(sock_net(sk
),
603 UDP_MIB_RCVBUFERRORS
, is_udplite
);
604 UDP6_INC_STATS_BH(sock_net(sk
), UDP_MIB_INERRORS
, is_udplite
);
611 static __inline__
void udpv6_err(struct sk_buff
*skb
,
612 struct inet6_skb_parm
*opt
, u8 type
,
613 u8 code
, int offset
, __be32 info
)
615 __udp6_lib_err(skb
, opt
, type
, code
, offset
, info
, &udp_table
);
618 static struct static_key udpv6_encap_needed __read_mostly
;
619 void udpv6_encap_enable(void)
621 if (!static_key_enabled(&udpv6_encap_needed
))
622 static_key_slow_inc(&udpv6_encap_needed
);
624 EXPORT_SYMBOL(udpv6_encap_enable
);
626 int udpv6_queue_rcv_skb(struct sock
*sk
, struct sk_buff
*skb
)
628 struct udp_sock
*up
= udp_sk(sk
);
630 int is_udplite
= IS_UDPLITE(sk
);
632 if (!xfrm6_policy_check(sk
, XFRM_POLICY_IN
, skb
))
635 if (static_key_false(&udpv6_encap_needed
) && up
->encap_type
) {
636 int (*encap_rcv
)(struct sock
*sk
, struct sk_buff
*skb
);
639 * This is an encapsulation socket so pass the skb to
640 * the socket's udp_encap_rcv() hook. Otherwise, just
641 * fall through and pass this up the UDP socket.
642 * up->encap_rcv() returns the following value:
643 * =0 if skb was successfully passed to the encap
644 * handler or was discarded by it.
645 * >0 if skb should be passed on to UDP.
646 * <0 if skb should be resubmitted as proto -N
649 /* if we're overly short, let UDP handle it */
650 encap_rcv
= ACCESS_ONCE(up
->encap_rcv
);
651 if (skb
->len
> sizeof(struct udphdr
) && encap_rcv
!= NULL
) {
654 /* Verify checksum before giving to encap */
655 if (udp_lib_checksum_complete(skb
))
658 ret
= encap_rcv(sk
, skb
);
660 UDP_INC_STATS_BH(sock_net(sk
),
667 /* FALLTHROUGH -- it's a UDP Packet */
671 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
673 if ((is_udplite
& UDPLITE_RECV_CC
) && UDP_SKB_CB(skb
)->partial_cov
) {
675 if (up
->pcrlen
== 0) { /* full coverage was set */
676 net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n",
677 UDP_SKB_CB(skb
)->cscov
, skb
->len
);
680 if (UDP_SKB_CB(skb
)->cscov
< up
->pcrlen
) {
681 net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n",
682 UDP_SKB_CB(skb
)->cscov
, up
->pcrlen
);
687 if (rcu_access_pointer(sk
->sk_filter
)) {
688 if (udp_lib_checksum_complete(skb
))
692 if (sk_rcvqueues_full(sk
, sk
->sk_rcvbuf
)) {
693 UDP6_INC_STATS_BH(sock_net(sk
),
694 UDP_MIB_RCVBUFERRORS
, is_udplite
);
702 if (!sock_owned_by_user(sk
))
703 rc
= __udpv6_queue_rcv_skb(sk
, skb
);
704 else if (sk_add_backlog(sk
, skb
, sk
->sk_rcvbuf
)) {
713 UDP6_INC_STATS_BH(sock_net(sk
), UDP_MIB_CSUMERRORS
, is_udplite
);
715 UDP6_INC_STATS_BH(sock_net(sk
), UDP_MIB_INERRORS
, is_udplite
);
716 atomic_inc(&sk
->sk_drops
);
721 static bool __udp_v6_is_mcast_sock(struct net
*net
, struct sock
*sk
,
722 __be16 loc_port
, const struct in6_addr
*loc_addr
,
723 __be16 rmt_port
, const struct in6_addr
*rmt_addr
,
724 int dif
, unsigned short hnum
)
726 struct inet_sock
*inet
= inet_sk(sk
);
728 if (!net_eq(sock_net(sk
), net
))
731 if (udp_sk(sk
)->udp_port_hash
!= hnum
||
732 sk
->sk_family
!= PF_INET6
||
733 (inet
->inet_dport
&& inet
->inet_dport
!= rmt_port
) ||
734 (!ipv6_addr_any(&sk
->sk_v6_daddr
) &&
735 !ipv6_addr_equal(&sk
->sk_v6_daddr
, rmt_addr
)) ||
736 (sk
->sk_bound_dev_if
&& sk
->sk_bound_dev_if
!= dif
))
738 if (!inet6_mc_check(sk
, loc_addr
, rmt_addr
))
743 static void flush_stack(struct sock
**stack
, unsigned int count
,
744 struct sk_buff
*skb
, unsigned int final
)
746 struct sk_buff
*skb1
= NULL
;
750 for (i
= 0; i
< count
; i
++) {
752 if (likely(skb1
== NULL
))
753 skb1
= (i
== final
) ? skb
: skb_clone(skb
, GFP_ATOMIC
);
755 atomic_inc(&sk
->sk_drops
);
756 UDP6_INC_STATS_BH(sock_net(sk
), UDP_MIB_RCVBUFERRORS
,
758 UDP6_INC_STATS_BH(sock_net(sk
), UDP_MIB_INERRORS
,
762 if (skb1
&& udpv6_queue_rcv_skb(sk
, skb1
) <= 0)
770 static void udp6_csum_zero_error(struct sk_buff
*skb
)
772 /* RFC 2460 section 8.1 says that we SHOULD log
773 * this error. Well, it is reasonable.
775 net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n",
776 &ipv6_hdr(skb
)->saddr
, ntohs(udp_hdr(skb
)->source
),
777 &ipv6_hdr(skb
)->daddr
, ntohs(udp_hdr(skb
)->dest
));
781 * Note: called only from the BH handler context,
782 * so we don't need to lock the hashes.
784 static int __udp6_lib_mcast_deliver(struct net
*net
, struct sk_buff
*skb
,
785 const struct in6_addr
*saddr
, const struct in6_addr
*daddr
,
786 struct udp_table
*udptable
, int proto
)
788 struct sock
*sk
, *stack
[256 / sizeof(struct sock
*)];
789 const struct udphdr
*uh
= udp_hdr(skb
);
790 struct hlist_nulls_node
*node
;
791 unsigned short hnum
= ntohs(uh
->dest
);
792 struct udp_hslot
*hslot
= udp_hashslot(udptable
, net
, hnum
);
793 int dif
= inet6_iif(skb
);
794 unsigned int count
= 0, offset
= offsetof(typeof(*sk
), sk_nulls_node
);
795 unsigned int hash2
= 0, hash2_any
= 0, use_hash2
= (hslot
->count
> 10);
796 bool inner_flushed
= false;
799 hash2_any
= udp6_portaddr_hash(net
, &in6addr_any
, hnum
) &
801 hash2
= udp6_portaddr_hash(net
, daddr
, hnum
) & udp_table
.mask
;
803 hslot
= &udp_table
.hash2
[hash2
];
804 offset
= offsetof(typeof(*sk
), __sk_common
.skc_portaddr_node
);
807 spin_lock(&hslot
->lock
);
808 sk_nulls_for_each_entry_offset(sk
, node
, &hslot
->head
, offset
) {
809 if (__udp_v6_is_mcast_sock(net
, sk
,
813 /* If zero checksum and no_check is not on for
814 * the socket then skip it.
816 (uh
->check
|| udp_sk(sk
)->no_check6_rx
)) {
817 if (unlikely(count
== ARRAY_SIZE(stack
))) {
818 flush_stack(stack
, count
, skb
, ~0);
819 inner_flushed
= true;
827 spin_unlock(&hslot
->lock
);
829 /* Also lookup *:port if we are using hash2 and haven't done so yet. */
830 if (use_hash2
&& hash2
!= hash2_any
) {
836 flush_stack(stack
, count
, skb
, count
- 1);
839 UDP_INC_STATS_BH(net
, UDP_MIB_IGNOREDMULTI
,
840 proto
== IPPROTO_UDPLITE
);
846 int __udp6_lib_rcv(struct sk_buff
*skb
, struct udp_table
*udptable
,
849 struct net
*net
= dev_net(skb
->dev
);
852 const struct in6_addr
*saddr
, *daddr
;
855 if (!pskb_may_pull(skb
, sizeof(struct udphdr
)))
858 saddr
= &ipv6_hdr(skb
)->saddr
;
859 daddr
= &ipv6_hdr(skb
)->daddr
;
862 ulen
= ntohs(uh
->len
);
866 if (proto
== IPPROTO_UDP
) {
867 /* UDP validates ulen. */
869 /* Check for jumbo payload */
873 if (ulen
< sizeof(*uh
))
876 if (ulen
< skb
->len
) {
877 if (pskb_trim_rcsum(skb
, ulen
))
879 saddr
= &ipv6_hdr(skb
)->saddr
;
880 daddr
= &ipv6_hdr(skb
)->daddr
;
885 if (udp6_csum_init(skb
, uh
, proto
))
889 * Multicast receive code
891 if (ipv6_addr_is_multicast(daddr
))
892 return __udp6_lib_mcast_deliver(net
, skb
,
893 saddr
, daddr
, udptable
, proto
);
898 * check socket cache ... must talk to Alan about his plans
899 * for sock caches... i'll skip this for now.
901 sk
= __udp6_lib_lookup_skb(skb
, uh
->source
, uh
->dest
, udptable
);
905 if (!uh
->check
&& !udp_sk(sk
)->no_check6_rx
) {
907 udp6_csum_zero_error(skb
);
911 if (inet_get_convert_csum(sk
) && uh
->check
&& !IS_UDPLITE(sk
))
912 skb_checksum_try_convert(skb
, IPPROTO_UDP
, uh
->check
,
915 ret
= udpv6_queue_rcv_skb(sk
, skb
);
918 /* a return value > 0 means to resubmit the input, but
919 * it wants the return to be -protocol, or 0
928 udp6_csum_zero_error(skb
);
932 if (!xfrm6_policy_check(NULL
, XFRM_POLICY_IN
, skb
))
935 if (udp_lib_checksum_complete(skb
))
938 UDP6_INC_STATS_BH(net
, UDP_MIB_NOPORTS
, proto
== IPPROTO_UDPLITE
);
939 icmpv6_send(skb
, ICMPV6_DEST_UNREACH
, ICMPV6_PORT_UNREACH
, 0);
945 net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n",
946 proto
== IPPROTO_UDPLITE
? "-Lite" : "",
947 saddr
, ntohs(uh
->source
),
949 daddr
, ntohs(uh
->dest
));
952 UDP6_INC_STATS_BH(net
, UDP_MIB_CSUMERRORS
, proto
== IPPROTO_UDPLITE
);
954 UDP6_INC_STATS_BH(net
, UDP_MIB_INERRORS
, proto
== IPPROTO_UDPLITE
);
959 static __inline__
int udpv6_rcv(struct sk_buff
*skb
)
961 return __udp6_lib_rcv(skb
, &udp_table
, IPPROTO_UDP
);
965 * Throw away all pending data and cancel the corking. Socket is locked.
967 static void udp_v6_flush_pending_frames(struct sock
*sk
)
969 struct udp_sock
*up
= udp_sk(sk
);
971 if (up
->pending
== AF_INET
)
972 udp_flush_pending_frames(sk
);
973 else if (up
->pending
) {
976 ip6_flush_pending_frames(sk
);
981 * udp6_hwcsum_outgoing - handle outgoing HW checksumming
982 * @sk: socket we are sending on
983 * @skb: sk_buff containing the filled-in UDP header
984 * (checksum field must be zeroed out)
986 static void udp6_hwcsum_outgoing(struct sock
*sk
, struct sk_buff
*skb
,
987 const struct in6_addr
*saddr
,
988 const struct in6_addr
*daddr
, int len
)
991 struct udphdr
*uh
= udp_hdr(skb
);
992 struct sk_buff
*frags
= skb_shinfo(skb
)->frag_list
;
996 /* Only one fragment on the socket. */
997 skb
->csum_start
= skb_transport_header(skb
) - skb
->head
;
998 skb
->csum_offset
= offsetof(struct udphdr
, check
);
999 uh
->check
= ~csum_ipv6_magic(saddr
, daddr
, len
, IPPROTO_UDP
, 0);
1002 * HW-checksum won't work as there are two or more
1003 * fragments on the socket so that all csums of sk_buffs
1004 * should be together
1006 offset
= skb_transport_offset(skb
);
1007 skb
->csum
= skb_checksum(skb
, offset
, skb
->len
- offset
, 0);
1009 skb
->ip_summed
= CHECKSUM_NONE
;
1012 csum
= csum_add(csum
, frags
->csum
);
1013 } while ((frags
= frags
->next
));
1015 uh
->check
= csum_ipv6_magic(saddr
, daddr
, len
, IPPROTO_UDP
,
1018 uh
->check
= CSUM_MANGLED_0
;
1026 static int udp_v6_send_skb(struct sk_buff
*skb
, struct flowi6
*fl6
)
1028 struct sock
*sk
= skb
->sk
;
1031 int is_udplite
= IS_UDPLITE(sk
);
1033 int offset
= skb_transport_offset(skb
);
1034 int len
= skb
->len
- offset
;
1037 * Create a UDP header
1040 uh
->source
= fl6
->fl6_sport
;
1041 uh
->dest
= fl6
->fl6_dport
;
1042 uh
->len
= htons(len
);
1046 csum
= udplite_csum(skb
);
1047 else if (udp_sk(sk
)->no_check6_tx
) { /* UDP csum disabled */
1048 skb
->ip_summed
= CHECKSUM_NONE
;
1050 } else if (skb
->ip_summed
== CHECKSUM_PARTIAL
) { /* UDP hardware csum */
1051 udp6_hwcsum_outgoing(sk
, skb
, &fl6
->saddr
, &fl6
->daddr
, len
);
1054 csum
= udp_csum(skb
);
1056 /* add protocol-dependent pseudo-header */
1057 uh
->check
= csum_ipv6_magic(&fl6
->saddr
, &fl6
->daddr
,
1058 len
, fl6
->flowi6_proto
, csum
);
1060 uh
->check
= CSUM_MANGLED_0
;
1063 err
= ip6_send_skb(skb
);
1065 if (err
== -ENOBUFS
&& !inet6_sk(sk
)->recverr
) {
1066 UDP6_INC_STATS_USER(sock_net(sk
),
1067 UDP_MIB_SNDBUFERRORS
, is_udplite
);
1071 UDP6_INC_STATS_USER(sock_net(sk
),
1072 UDP_MIB_OUTDATAGRAMS
, is_udplite
);
1076 static int udp_v6_push_pending_frames(struct sock
*sk
)
1078 struct sk_buff
*skb
;
1079 struct udp_sock
*up
= udp_sk(sk
);
1083 if (up
->pending
== AF_INET
)
1084 return udp_push_pending_frames(sk
);
1086 /* ip6_finish_skb will release the cork, so make a copy of
1089 fl6
= inet_sk(sk
)->cork
.fl
.u
.ip6
;
1091 skb
= ip6_finish_skb(sk
);
1095 err
= udp_v6_send_skb(skb
, &fl6
);
1103 int udpv6_sendmsg(struct sock
*sk
, struct msghdr
*msg
, size_t len
)
1105 struct ipv6_txoptions opt_space
;
1106 struct udp_sock
*up
= udp_sk(sk
);
1107 struct inet_sock
*inet
= inet_sk(sk
);
1108 struct ipv6_pinfo
*np
= inet6_sk(sk
);
1109 DECLARE_SOCKADDR(struct sockaddr_in6
*, sin6
, msg
->msg_name
);
1110 struct in6_addr
*daddr
, *final_p
, final
;
1111 struct ipv6_txoptions
*opt
= NULL
;
1112 struct ip6_flowlabel
*flowlabel
= NULL
;
1114 struct dst_entry
*dst
;
1115 int addr_len
= msg
->msg_namelen
;
1120 int corkreq
= up
->corkflag
|| msg
->msg_flags
&MSG_MORE
;
1123 int is_udplite
= IS_UDPLITE(sk
);
1124 int (*getfrag
)(void *, char *, int, int, int, struct sk_buff
*);
1126 /* destination address check */
1128 if (addr_len
< offsetof(struct sockaddr
, sa_data
))
1131 switch (sin6
->sin6_family
) {
1133 if (addr_len
< SIN6_LEN_RFC2133
)
1135 daddr
= &sin6
->sin6_addr
;
1138 goto do_udp_sendmsg
;
1140 msg
->msg_name
= sin6
= NULL
;
1141 msg
->msg_namelen
= addr_len
= 0;
1147 } else if (!up
->pending
) {
1148 if (sk
->sk_state
!= TCP_ESTABLISHED
)
1149 return -EDESTADDRREQ
;
1150 daddr
= &sk
->sk_v6_daddr
;
1155 if (ipv6_addr_v4mapped(daddr
)) {
1156 struct sockaddr_in sin
;
1157 sin
.sin_family
= AF_INET
;
1158 sin
.sin_port
= sin6
? sin6
->sin6_port
: inet
->inet_dport
;
1159 sin
.sin_addr
.s_addr
= daddr
->s6_addr32
[3];
1160 msg
->msg_name
= &sin
;
1161 msg
->msg_namelen
= sizeof(sin
);
1163 if (__ipv6_only_sock(sk
))
1164 return -ENETUNREACH
;
1165 return udp_sendmsg(sk
, msg
, len
);
1169 if (up
->pending
== AF_INET
)
1170 return udp_sendmsg(sk
, msg
, len
);
1172 /* Rough check on arithmetic overflow,
1173 better check is made in ip6_append_data().
1175 if (len
> INT_MAX
- sizeof(struct udphdr
))
1178 getfrag
= is_udplite
? udplite_getfrag
: ip_generic_getfrag
;
1181 * There are pending frames.
1182 * The socket lock must be held while it's corked.
1185 if (likely(up
->pending
)) {
1186 if (unlikely(up
->pending
!= AF_INET6
)) {
1188 return -EAFNOSUPPORT
;
1191 goto do_append_data
;
1195 ulen
+= sizeof(struct udphdr
);
1197 memset(&fl6
, 0, sizeof(fl6
));
1200 if (sin6
->sin6_port
== 0)
1203 fl6
.fl6_dport
= sin6
->sin6_port
;
1204 daddr
= &sin6
->sin6_addr
;
1207 fl6
.flowlabel
= sin6
->sin6_flowinfo
&IPV6_FLOWINFO_MASK
;
1208 if (fl6
.flowlabel
&IPV6_FLOWLABEL_MASK
) {
1209 flowlabel
= fl6_sock_lookup(sk
, fl6
.flowlabel
);
1210 if (flowlabel
== NULL
)
1216 * Otherwise it will be difficult to maintain
1219 if (sk
->sk_state
== TCP_ESTABLISHED
&&
1220 ipv6_addr_equal(daddr
, &sk
->sk_v6_daddr
))
1221 daddr
= &sk
->sk_v6_daddr
;
1223 if (addr_len
>= sizeof(struct sockaddr_in6
) &&
1224 sin6
->sin6_scope_id
&&
1225 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr
)))
1226 fl6
.flowi6_oif
= sin6
->sin6_scope_id
;
1228 if (sk
->sk_state
!= TCP_ESTABLISHED
)
1229 return -EDESTADDRREQ
;
1231 fl6
.fl6_dport
= inet
->inet_dport
;
1232 daddr
= &sk
->sk_v6_daddr
;
1233 fl6
.flowlabel
= np
->flow_label
;
1237 if (!fl6
.flowi6_oif
)
1238 fl6
.flowi6_oif
= sk
->sk_bound_dev_if
;
1240 if (!fl6
.flowi6_oif
)
1241 fl6
.flowi6_oif
= np
->sticky_pktinfo
.ipi6_ifindex
;
1243 fl6
.flowi6_mark
= sk
->sk_mark
;
1245 if (msg
->msg_controllen
) {
1247 memset(opt
, 0, sizeof(struct ipv6_txoptions
));
1248 opt
->tot_len
= sizeof(*opt
);
1250 err
= ip6_datagram_send_ctl(sock_net(sk
), sk
, msg
, &fl6
, opt
,
1251 &hlimit
, &tclass
, &dontfrag
);
1253 fl6_sock_release(flowlabel
);
1256 if ((fl6
.flowlabel
&IPV6_FLOWLABEL_MASK
) && !flowlabel
) {
1257 flowlabel
= fl6_sock_lookup(sk
, fl6
.flowlabel
);
1258 if (flowlabel
== NULL
)
1261 if (!(opt
->opt_nflen
|opt
->opt_flen
))
1268 opt
= fl6_merge_options(&opt_space
, flowlabel
, opt
);
1269 opt
= ipv6_fixup_options(&opt_space
, opt
);
1271 fl6
.flowi6_proto
= sk
->sk_protocol
;
1272 if (!ipv6_addr_any(daddr
))
1275 fl6
.daddr
.s6_addr
[15] = 0x1; /* :: means loopback (BSD'ism) */
1276 if (ipv6_addr_any(&fl6
.saddr
) && !ipv6_addr_any(&np
->saddr
))
1277 fl6
.saddr
= np
->saddr
;
1278 fl6
.fl6_sport
= inet
->inet_sport
;
1280 final_p
= fl6_update_dst(&fl6
, opt
, &final
);
1284 if (!fl6
.flowi6_oif
&& ipv6_addr_is_multicast(&fl6
.daddr
)) {
1285 fl6
.flowi6_oif
= np
->mcast_oif
;
1287 } else if (!fl6
.flowi6_oif
)
1288 fl6
.flowi6_oif
= np
->ucast_oif
;
1290 security_sk_classify_flow(sk
, flowi6_to_flowi(&fl6
));
1292 dst
= ip6_sk_dst_lookup_flow(sk
, &fl6
, final_p
);
1300 hlimit
= ip6_sk_dst_hoplimit(np
, &fl6
, dst
);
1303 tclass
= np
->tclass
;
1305 if (msg
->msg_flags
&MSG_CONFIRM
)
1309 /* Lockless fast path for the non-corking case */
1311 struct sk_buff
*skb
;
1313 skb
= ip6_make_skb(sk
, getfrag
, msg
, ulen
,
1314 sizeof(struct udphdr
), hlimit
, tclass
, opt
,
1315 &fl6
, (struct rt6_info
*)dst
,
1316 msg
->msg_flags
, dontfrag
);
1318 if (!IS_ERR_OR_NULL(skb
))
1319 err
= udp_v6_send_skb(skb
, &fl6
);
1324 if (unlikely(up
->pending
)) {
1325 /* The socket is already corked while preparing it. */
1326 /* ... which is an evident application bug. --ANK */
1329 net_dbg_ratelimited("udp cork app bug 2\n");
1334 up
->pending
= AF_INET6
;
1338 dontfrag
= np
->dontfrag
;
1340 err
= ip6_append_data(sk
, getfrag
, msg
, ulen
,
1341 sizeof(struct udphdr
), hlimit
, tclass
, opt
, &fl6
,
1342 (struct rt6_info
*)dst
,
1343 corkreq
? msg
->msg_flags
|MSG_MORE
: msg
->msg_flags
, dontfrag
);
1345 udp_v6_flush_pending_frames(sk
);
1347 err
= udp_v6_push_pending_frames(sk
);
1348 else if (unlikely(skb_queue_empty(&sk
->sk_write_queue
)))
1352 err
= np
->recverr
? net_xmit_errno(err
) : 0;
1358 ip6_dst_store(sk
, dst
,
1359 ipv6_addr_equal(&fl6
.daddr
, &sk
->sk_v6_daddr
) ?
1360 &sk
->sk_v6_daddr
: NULL
,
1361 #ifdef CONFIG_IPV6_SUBTREES
1362 ipv6_addr_equal(&fl6
.saddr
, &np
->saddr
) ?
1374 fl6_sock_release(flowlabel
);
1378 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
1379 * ENOBUFS might not be good (it's not tunable per se), but otherwise
1380 * we don't have a good statistic (IpOutDiscards but it can be too many
1381 * things). We could add another new stat but at least for now that
1382 * seems like overkill.
1384 if (err
== -ENOBUFS
|| test_bit(SOCK_NOSPACE
, &sk
->sk_socket
->flags
)) {
1385 UDP6_INC_STATS_USER(sock_net(sk
),
1386 UDP_MIB_SNDBUFERRORS
, is_udplite
);
1392 if (!(msg
->msg_flags
&MSG_PROBE
) || len
)
1393 goto back_from_confirm
;
1398 void udpv6_destroy_sock(struct sock
*sk
)
1400 struct udp_sock
*up
= udp_sk(sk
);
1402 udp_v6_flush_pending_frames(sk
);
1405 if (static_key_false(&udpv6_encap_needed
) && up
->encap_type
) {
1406 void (*encap_destroy
)(struct sock
*sk
);
1407 encap_destroy
= ACCESS_ONCE(up
->encap_destroy
);
1412 inet6_destroy_sock(sk
);
1416 * Socket option code for UDP
1418 int udpv6_setsockopt(struct sock
*sk
, int level
, int optname
,
1419 char __user
*optval
, unsigned int optlen
)
1421 if (level
== SOL_UDP
|| level
== SOL_UDPLITE
)
1422 return udp_lib_setsockopt(sk
, level
, optname
, optval
, optlen
,
1423 udp_v6_push_pending_frames
);
1424 return ipv6_setsockopt(sk
, level
, optname
, optval
, optlen
);
1427 #ifdef CONFIG_COMPAT
1428 int compat_udpv6_setsockopt(struct sock
*sk
, int level
, int optname
,
1429 char __user
*optval
, unsigned int optlen
)
1431 if (level
== SOL_UDP
|| level
== SOL_UDPLITE
)
1432 return udp_lib_setsockopt(sk
, level
, optname
, optval
, optlen
,
1433 udp_v6_push_pending_frames
);
1434 return compat_ipv6_setsockopt(sk
, level
, optname
, optval
, optlen
);
1438 int udpv6_getsockopt(struct sock
*sk
, int level
, int optname
,
1439 char __user
*optval
, int __user
*optlen
)
1441 if (level
== SOL_UDP
|| level
== SOL_UDPLITE
)
1442 return udp_lib_getsockopt(sk
, level
, optname
, optval
, optlen
);
1443 return ipv6_getsockopt(sk
, level
, optname
, optval
, optlen
);
1446 #ifdef CONFIG_COMPAT
1447 int compat_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 compat_ipv6_getsockopt(sk
, level
, optname
, optval
, optlen
);
1456 static const struct inet6_protocol udpv6_protocol
= {
1457 .handler
= udpv6_rcv
,
1458 .err_handler
= udpv6_err
,
1459 .flags
= INET6_PROTO_NOPOLICY
|INET6_PROTO_FINAL
,
1462 /* ------------------------------------------------------------------------ */
1463 #ifdef CONFIG_PROC_FS
1464 int udp6_seq_show(struct seq_file
*seq
, void *v
)
1466 if (v
== SEQ_START_TOKEN
) {
1467 seq_puts(seq
, IPV6_SEQ_DGRAM_HEADER
);
1469 int bucket
= ((struct udp_iter_state
*)seq
->private)->bucket
;
1470 struct inet_sock
*inet
= inet_sk(v
);
1471 __u16 srcp
= ntohs(inet
->inet_sport
);
1472 __u16 destp
= ntohs(inet
->inet_dport
);
1473 ip6_dgram_sock_seq_show(seq
, v
, srcp
, destp
, bucket
);
1478 static const struct file_operations udp6_afinfo_seq_fops
= {
1479 .owner
= THIS_MODULE
,
1480 .open
= udp_seq_open
,
1482 .llseek
= seq_lseek
,
1483 .release
= seq_release_net
1486 static struct udp_seq_afinfo udp6_seq_afinfo
= {
1489 .udp_table
= &udp_table
,
1490 .seq_fops
= &udp6_afinfo_seq_fops
,
1492 .show
= udp6_seq_show
,
1496 int __net_init
udp6_proc_init(struct net
*net
)
1498 return udp_proc_register(net
, &udp6_seq_afinfo
);
1501 void udp6_proc_exit(struct net
*net
) {
1502 udp_proc_unregister(net
, &udp6_seq_afinfo
);
1504 #endif /* CONFIG_PROC_FS */
1506 void udp_v6_clear_sk(struct sock
*sk
, int size
)
1508 struct inet_sock
*inet
= inet_sk(sk
);
1510 /* we do not want to clear pinet6 field, because of RCU lookups */
1511 sk_prot_clear_portaddr_nulls(sk
, offsetof(struct inet_sock
, pinet6
));
1513 size
-= offsetof(struct inet_sock
, pinet6
) + sizeof(inet
->pinet6
);
1514 memset(&inet
->pinet6
+ 1, 0, size
);
1517 /* ------------------------------------------------------------------------ */
1519 struct proto udpv6_prot
= {
1521 .owner
= THIS_MODULE
,
1522 .close
= udp_lib_close
,
1523 .connect
= ip6_datagram_connect
,
1524 .disconnect
= udp_disconnect
,
1526 .destroy
= udpv6_destroy_sock
,
1527 .setsockopt
= udpv6_setsockopt
,
1528 .getsockopt
= udpv6_getsockopt
,
1529 .sendmsg
= udpv6_sendmsg
,
1530 .recvmsg
= udpv6_recvmsg
,
1531 .backlog_rcv
= __udpv6_queue_rcv_skb
,
1532 .hash
= udp_lib_hash
,
1533 .unhash
= udp_lib_unhash
,
1534 .rehash
= udp_v6_rehash
,
1535 .get_port
= udp_v6_get_port
,
1536 .memory_allocated
= &udp_memory_allocated
,
1537 .sysctl_mem
= sysctl_udp_mem
,
1538 .sysctl_wmem
= &sysctl_udp_wmem_min
,
1539 .sysctl_rmem
= &sysctl_udp_rmem_min
,
1540 .obj_size
= sizeof(struct udp6_sock
),
1541 .slab_flags
= SLAB_DESTROY_BY_RCU
,
1542 .h
.udp_table
= &udp_table
,
1543 #ifdef CONFIG_COMPAT
1544 .compat_setsockopt
= compat_udpv6_setsockopt
,
1545 .compat_getsockopt
= compat_udpv6_getsockopt
,
1547 .clear_sk
= udp_v6_clear_sk
,
1550 static struct inet_protosw udpv6_protosw
= {
1552 .protocol
= IPPROTO_UDP
,
1553 .prot
= &udpv6_prot
,
1554 .ops
= &inet6_dgram_ops
,
1555 .flags
= INET_PROTOSW_PERMANENT
,
1559 int __init
udpv6_init(void)
1563 ret
= inet6_add_protocol(&udpv6_protocol
, IPPROTO_UDP
);
1567 ret
= inet6_register_protosw(&udpv6_protosw
);
1569 goto out_udpv6_protocol
;
1574 inet6_del_protocol(&udpv6_protocol
, IPPROTO_UDP
);
1578 void udpv6_exit(void)
1580 inet6_unregister_protosw(&udpv6_protosw
);
1581 inet6_del_protocol(&udpv6_protocol
, IPPROTO_UDP
);