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 <linux/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/inet_hashtables.h>
50 #include <net/inet6_hashtables.h>
51 #include <net/busy_poll.h>
52 #include <net/sock_reuseport.h>
54 #include <linux/proc_fs.h>
55 #include <linux/seq_file.h>
56 #include <trace/events/skb.h>
59 static bool udp6_lib_exact_dif_match(struct net
*net
, struct sk_buff
*skb
)
61 #if defined(CONFIG_NET_L3_MASTER_DEV)
62 if (!net
->ipv4
.sysctl_udp_l3mdev_accept
&&
63 skb
&& ipv6_l3mdev_skb(IP6CB(skb
)->flags
))
69 static u32
udp6_ehashfn(const struct net
*net
,
70 const struct in6_addr
*laddr
,
72 const struct in6_addr
*faddr
,
75 static u32 udp6_ehash_secret __read_mostly
;
76 static u32 udp_ipv6_hash_secret __read_mostly
;
80 net_get_random_once(&udp6_ehash_secret
,
81 sizeof(udp6_ehash_secret
));
82 net_get_random_once(&udp_ipv6_hash_secret
,
83 sizeof(udp_ipv6_hash_secret
));
85 lhash
= (__force u32
)laddr
->s6_addr32
[3];
86 fhash
= __ipv6_addr_jhash(faddr
, udp_ipv6_hash_secret
);
88 return __inet6_ehashfn(lhash
, lport
, fhash
, fport
,
89 udp_ipv6_hash_secret
+ net_hash_mix(net
));
92 static u32
udp6_portaddr_hash(const struct net
*net
,
93 const struct in6_addr
*addr6
,
96 unsigned int hash
, mix
= net_hash_mix(net
);
98 if (ipv6_addr_any(addr6
))
99 hash
= jhash_1word(0, mix
);
100 else if (ipv6_addr_v4mapped(addr6
))
101 hash
= jhash_1word((__force u32
)addr6
->s6_addr32
[3], mix
);
103 hash
= jhash2((__force u32
*)addr6
->s6_addr32
, 4, mix
);
108 int udp_v6_get_port(struct sock
*sk
, unsigned short snum
)
110 unsigned int hash2_nulladdr
=
111 udp6_portaddr_hash(sock_net(sk
), &in6addr_any
, snum
);
112 unsigned int hash2_partial
=
113 udp6_portaddr_hash(sock_net(sk
), &sk
->sk_v6_rcv_saddr
, 0);
115 /* precompute partial secondary hash */
116 udp_sk(sk
)->udp_portaddr_hash
= hash2_partial
;
117 return udp_lib_get_port(sk
, snum
, hash2_nulladdr
);
120 static void udp_v6_rehash(struct sock
*sk
)
122 u16 new_hash
= udp6_portaddr_hash(sock_net(sk
),
123 &sk
->sk_v6_rcv_saddr
,
124 inet_sk(sk
)->inet_num
);
126 udp_lib_rehash(sk
, new_hash
);
129 static int compute_score(struct sock
*sk
, struct net
*net
,
130 const struct in6_addr
*saddr
, __be16 sport
,
131 const struct in6_addr
*daddr
, unsigned short hnum
,
132 int dif
, bool exact_dif
)
135 struct inet_sock
*inet
;
137 if (!net_eq(sock_net(sk
), net
) ||
138 udp_sk(sk
)->udp_port_hash
!= hnum
||
139 sk
->sk_family
!= PF_INET6
)
145 if (inet
->inet_dport
) {
146 if (inet
->inet_dport
!= sport
)
151 if (!ipv6_addr_any(&sk
->sk_v6_rcv_saddr
)) {
152 if (!ipv6_addr_equal(&sk
->sk_v6_rcv_saddr
, daddr
))
157 if (!ipv6_addr_any(&sk
->sk_v6_daddr
)) {
158 if (!ipv6_addr_equal(&sk
->sk_v6_daddr
, saddr
))
163 if (sk
->sk_bound_dev_if
|| exact_dif
) {
164 if (sk
->sk_bound_dev_if
!= dif
)
169 if (sk
->sk_incoming_cpu
== raw_smp_processor_id())
175 /* called with rcu_read_lock() */
176 static struct sock
*udp6_lib_lookup2(struct net
*net
,
177 const struct in6_addr
*saddr
, __be16 sport
,
178 const struct in6_addr
*daddr
, unsigned int hnum
, int dif
,
179 bool exact_dif
, struct udp_hslot
*hslot2
,
182 struct sock
*sk
, *result
;
183 int score
, badness
, matches
= 0, reuseport
= 0;
188 udp_portaddr_for_each_entry_rcu(sk
, &hslot2
->head
) {
189 score
= compute_score(sk
, net
, saddr
, sport
,
190 daddr
, hnum
, dif
, exact_dif
);
191 if (score
> badness
) {
192 reuseport
= sk
->sk_reuseport
;
194 hash
= udp6_ehashfn(net
, daddr
, hnum
,
197 result
= reuseport_select_sock(sk
, hash
, skb
,
198 sizeof(struct udphdr
));
205 } else if (score
== badness
&& reuseport
) {
207 if (reciprocal_scale(hash
, matches
) == 0)
209 hash
= next_pseudo_random32(hash
);
215 /* rcu_read_lock() must be held */
216 struct sock
*__udp6_lib_lookup(struct net
*net
,
217 const struct in6_addr
*saddr
, __be16 sport
,
218 const struct in6_addr
*daddr
, __be16 dport
,
219 int dif
, struct udp_table
*udptable
,
222 struct sock
*sk
, *result
;
223 unsigned short hnum
= ntohs(dport
);
224 unsigned int hash2
, slot2
, slot
= udp_hashfn(net
, hnum
, udptable
->mask
);
225 struct udp_hslot
*hslot2
, *hslot
= &udptable
->hash
[slot
];
226 bool exact_dif
= udp6_lib_exact_dif_match(net
, skb
);
227 int score
, badness
, matches
= 0, reuseport
= 0;
230 if (hslot
->count
> 10) {
231 hash2
= udp6_portaddr_hash(net
, daddr
, hnum
);
232 slot2
= hash2
& udptable
->mask
;
233 hslot2
= &udptable
->hash2
[slot2
];
234 if (hslot
->count
< hslot2
->count
)
237 result
= udp6_lib_lookup2(net
, saddr
, sport
,
238 daddr
, hnum
, dif
, exact_dif
,
241 unsigned int old_slot2
= slot2
;
242 hash2
= udp6_portaddr_hash(net
, &in6addr_any
, hnum
);
243 slot2
= hash2
& udptable
->mask
;
244 /* avoid searching the same slot again. */
245 if (unlikely(slot2
== old_slot2
))
248 hslot2
= &udptable
->hash2
[slot2
];
249 if (hslot
->count
< hslot2
->count
)
252 result
= udp6_lib_lookup2(net
, saddr
, sport
,
262 sk_for_each_rcu(sk
, &hslot
->head
) {
263 score
= compute_score(sk
, net
, saddr
, sport
, daddr
, hnum
, dif
,
265 if (score
> badness
) {
266 reuseport
= sk
->sk_reuseport
;
268 hash
= udp6_ehashfn(net
, daddr
, hnum
,
270 result
= reuseport_select_sock(sk
, hash
, skb
,
271 sizeof(struct udphdr
));
278 } else if (score
== badness
&& reuseport
) {
280 if (reciprocal_scale(hash
, matches
) == 0)
282 hash
= next_pseudo_random32(hash
);
287 EXPORT_SYMBOL_GPL(__udp6_lib_lookup
);
289 static struct sock
*__udp6_lib_lookup_skb(struct sk_buff
*skb
,
290 __be16 sport
, __be16 dport
,
291 struct udp_table
*udptable
)
293 const struct ipv6hdr
*iph
= ipv6_hdr(skb
);
296 sk
= skb_steal_sock(skb
);
299 return __udp6_lib_lookup(dev_net(skb
->dev
), &iph
->saddr
, sport
,
300 &iph
->daddr
, dport
, inet6_iif(skb
),
304 struct sock
*udp6_lib_lookup_skb(struct sk_buff
*skb
,
305 __be16 sport
, __be16 dport
)
307 const struct ipv6hdr
*iph
= ipv6_hdr(skb
);
309 return __udp6_lib_lookup(dev_net(skb
->dev
), &iph
->saddr
, sport
,
310 &iph
->daddr
, dport
, inet6_iif(skb
),
313 EXPORT_SYMBOL_GPL(udp6_lib_lookup_skb
);
315 /* Must be called under rcu_read_lock().
316 * Does increment socket refcount.
318 #if IS_ENABLED(CONFIG_NETFILTER_XT_MATCH_SOCKET) || \
319 IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TPROXY) || \
320 IS_ENABLED(CONFIG_NF_SOCKET_IPV6)
321 struct sock
*udp6_lib_lookup(struct net
*net
, const struct in6_addr
*saddr
, __be16 sport
,
322 const struct in6_addr
*daddr
, __be16 dport
, int dif
)
326 sk
= __udp6_lib_lookup(net
, saddr
, sport
, daddr
, dport
,
327 dif
, &udp_table
, NULL
);
328 if (sk
&& !atomic_inc_not_zero(&sk
->sk_refcnt
))
332 EXPORT_SYMBOL_GPL(udp6_lib_lookup
);
336 * This should be easy, if there is something there we
337 * return it, otherwise we block.
340 int udpv6_recvmsg(struct sock
*sk
, struct msghdr
*msg
, size_t len
,
341 int noblock
, int flags
, int *addr_len
)
343 struct ipv6_pinfo
*np
= inet6_sk(sk
);
344 struct inet_sock
*inet
= inet_sk(sk
);
346 unsigned int ulen
, copied
;
347 int peeked
, peeking
, off
;
349 int is_udplite
= IS_UDPLITE(sk
);
350 bool checksum_valid
= false;
353 if (flags
& MSG_ERRQUEUE
)
354 return ipv6_recv_error(sk
, msg
, len
, addr_len
);
356 if (np
->rxpmtu
&& np
->rxopt
.bits
.rxpmtu
)
357 return ipv6_recv_rxpmtu(sk
, msg
, len
, addr_len
);
360 peeking
= off
= sk_peek_offset(sk
, flags
);
361 skb
= __skb_recv_udp(sk
, flags
, noblock
, &peeked
, &off
, &err
);
367 if (copied
> ulen
- off
)
369 else if (copied
< ulen
)
370 msg
->msg_flags
|= MSG_TRUNC
;
372 is_udp4
= (skb
->protocol
== htons(ETH_P_IP
));
375 * If checksum is needed at all, try to do it while copying the
376 * data. If the data is truncated, or if we only want a partial
377 * coverage checksum (UDP-Lite), do it before the copy.
380 if (copied
< ulen
|| peeking
||
381 (is_udplite
&& UDP_SKB_CB(skb
)->partial_cov
)) {
382 checksum_valid
= !udp_lib_checksum_complete(skb
);
387 if (checksum_valid
|| skb_csum_unnecessary(skb
))
388 err
= skb_copy_datagram_msg(skb
, off
, msg
, copied
);
390 err
= skb_copy_and_csum_datagram_msg(skb
, off
, msg
);
396 atomic_inc(&sk
->sk_drops
);
398 UDP_INC_STATS(sock_net(sk
), UDP_MIB_INERRORS
,
401 UDP6_INC_STATS(sock_net(sk
), UDP_MIB_INERRORS
,
409 UDP_INC_STATS(sock_net(sk
), UDP_MIB_INDATAGRAMS
,
412 UDP6_INC_STATS(sock_net(sk
), UDP_MIB_INDATAGRAMS
,
416 sock_recv_ts_and_drops(msg
, sk
, skb
);
418 /* Copy the address. */
420 DECLARE_SOCKADDR(struct sockaddr_in6
*, sin6
, msg
->msg_name
);
421 sin6
->sin6_family
= AF_INET6
;
422 sin6
->sin6_port
= udp_hdr(skb
)->source
;
423 sin6
->sin6_flowinfo
= 0;
426 ipv6_addr_set_v4mapped(ip_hdr(skb
)->saddr
,
428 sin6
->sin6_scope_id
= 0;
430 sin6
->sin6_addr
= ipv6_hdr(skb
)->saddr
;
431 sin6
->sin6_scope_id
=
432 ipv6_iface_scope_id(&sin6
->sin6_addr
,
435 *addr_len
= sizeof(*sin6
);
439 ip6_datagram_recv_common_ctl(sk
, msg
, skb
);
442 if (inet
->cmsg_flags
)
443 ip_cmsg_recv_offset(msg
, sk
, skb
,
444 sizeof(struct udphdr
), off
);
447 ip6_datagram_recv_specific_ctl(sk
, msg
, skb
);
451 if (flags
& MSG_TRUNC
)
454 skb_consume_udp(sk
, skb
, peeking
? -err
: err
);
458 if (!__sk_queue_drop_skb(sk
, &udp_sk(sk
)->reader_queue
, skb
, flags
,
459 udp_skb_destructor
)) {
461 UDP_INC_STATS(sock_net(sk
),
462 UDP_MIB_CSUMERRORS
, is_udplite
);
463 UDP_INC_STATS(sock_net(sk
),
464 UDP_MIB_INERRORS
, is_udplite
);
466 UDP6_INC_STATS(sock_net(sk
),
467 UDP_MIB_CSUMERRORS
, is_udplite
);
468 UDP6_INC_STATS(sock_net(sk
),
469 UDP_MIB_INERRORS
, is_udplite
);
474 /* starting over for a new packet, but check if we need to yield */
476 msg
->msg_flags
&= ~MSG_TRUNC
;
480 void __udp6_lib_err(struct sk_buff
*skb
, struct inet6_skb_parm
*opt
,
481 u8 type
, u8 code
, int offset
, __be32 info
,
482 struct udp_table
*udptable
)
484 struct ipv6_pinfo
*np
;
485 const struct ipv6hdr
*hdr
= (const struct ipv6hdr
*)skb
->data
;
486 const struct in6_addr
*saddr
= &hdr
->saddr
;
487 const struct in6_addr
*daddr
= &hdr
->daddr
;
488 struct udphdr
*uh
= (struct udphdr
*)(skb
->data
+offset
);
492 struct net
*net
= dev_net(skb
->dev
);
494 sk
= __udp6_lib_lookup(net
, daddr
, uh
->dest
, saddr
, uh
->source
,
495 inet6_iif(skb
), udptable
, skb
);
497 __ICMP6_INC_STATS(net
, __in6_dev_get(skb
->dev
),
502 harderr
= icmpv6_err_convert(type
, code
, &err
);
505 if (type
== ICMPV6_PKT_TOOBIG
) {
506 if (!ip6_sk_accept_pmtu(sk
))
508 ip6_sk_update_pmtu(skb
, sk
, info
);
509 if (np
->pmtudisc
!= IPV6_PMTUDISC_DONT
)
512 if (type
== NDISC_REDIRECT
) {
513 ip6_sk_redirect(skb
, sk
);
518 if (!harderr
|| sk
->sk_state
!= TCP_ESTABLISHED
)
521 ipv6_icmp_error(sk
, skb
, err
, uh
->dest
, ntohl(info
), (u8
*)(uh
+1));
525 sk
->sk_error_report(sk
);
530 static int __udpv6_queue_rcv_skb(struct sock
*sk
, struct sk_buff
*skb
)
534 if (!ipv6_addr_any(&sk
->sk_v6_daddr
)) {
535 sock_rps_save_rxhash(sk
, skb
);
536 sk_mark_napi_id(sk
, skb
);
537 sk_incoming_cpu_update(sk
);
539 sk_mark_napi_id_once(sk
, skb
);
542 rc
= __udp_enqueue_schedule_skb(sk
, skb
);
544 int is_udplite
= IS_UDPLITE(sk
);
546 /* Note that an ENOMEM error is charged twice */
548 UDP6_INC_STATS(sock_net(sk
),
549 UDP_MIB_RCVBUFERRORS
, is_udplite
);
550 UDP6_INC_STATS(sock_net(sk
), UDP_MIB_INERRORS
, is_udplite
);
558 static __inline__
void udpv6_err(struct sk_buff
*skb
,
559 struct inet6_skb_parm
*opt
, u8 type
,
560 u8 code
, int offset
, __be32 info
)
562 __udp6_lib_err(skb
, opt
, type
, code
, offset
, info
, &udp_table
);
565 static struct static_key udpv6_encap_needed __read_mostly
;
566 void udpv6_encap_enable(void)
568 if (!static_key_enabled(&udpv6_encap_needed
))
569 static_key_slow_inc(&udpv6_encap_needed
);
571 EXPORT_SYMBOL(udpv6_encap_enable
);
573 static int udpv6_queue_rcv_skb(struct sock
*sk
, struct sk_buff
*skb
)
575 struct udp_sock
*up
= udp_sk(sk
);
576 int is_udplite
= IS_UDPLITE(sk
);
578 if (!xfrm6_policy_check(sk
, XFRM_POLICY_IN
, skb
))
581 if (static_key_false(&udpv6_encap_needed
) && up
->encap_type
) {
582 int (*encap_rcv
)(struct sock
*sk
, struct sk_buff
*skb
);
585 * This is an encapsulation socket so pass the skb to
586 * the socket's udp_encap_rcv() hook. Otherwise, just
587 * fall through and pass this up the UDP socket.
588 * up->encap_rcv() returns the following value:
589 * =0 if skb was successfully passed to the encap
590 * handler or was discarded by it.
591 * >0 if skb should be passed on to UDP.
592 * <0 if skb should be resubmitted as proto -N
595 /* if we're overly short, let UDP handle it */
596 encap_rcv
= ACCESS_ONCE(up
->encap_rcv
);
600 /* Verify checksum before giving to encap */
601 if (udp_lib_checksum_complete(skb
))
604 ret
= encap_rcv(sk
, skb
);
606 __UDP_INC_STATS(sock_net(sk
),
613 /* FALLTHROUGH -- it's a UDP Packet */
617 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
619 if ((is_udplite
& UDPLITE_RECV_CC
) && UDP_SKB_CB(skb
)->partial_cov
) {
621 if (up
->pcrlen
== 0) { /* full coverage was set */
622 net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n",
623 UDP_SKB_CB(skb
)->cscov
, skb
->len
);
626 if (UDP_SKB_CB(skb
)->cscov
< up
->pcrlen
) {
627 net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n",
628 UDP_SKB_CB(skb
)->cscov
, up
->pcrlen
);
633 prefetch(&sk
->sk_rmem_alloc
);
634 if (rcu_access_pointer(sk
->sk_filter
) &&
635 udp_lib_checksum_complete(skb
))
638 if (sk_filter_trim_cap(sk
, skb
, sizeof(struct udphdr
)))
641 udp_csum_pull_header(skb
);
645 return __udpv6_queue_rcv_skb(sk
, skb
);
648 __UDP6_INC_STATS(sock_net(sk
), UDP_MIB_CSUMERRORS
, is_udplite
);
650 __UDP6_INC_STATS(sock_net(sk
), UDP_MIB_INERRORS
, is_udplite
);
651 atomic_inc(&sk
->sk_drops
);
656 static bool __udp_v6_is_mcast_sock(struct net
*net
, struct sock
*sk
,
657 __be16 loc_port
, const struct in6_addr
*loc_addr
,
658 __be16 rmt_port
, const struct in6_addr
*rmt_addr
,
659 int dif
, unsigned short hnum
)
661 struct inet_sock
*inet
= inet_sk(sk
);
663 if (!net_eq(sock_net(sk
), net
))
666 if (udp_sk(sk
)->udp_port_hash
!= hnum
||
667 sk
->sk_family
!= PF_INET6
||
668 (inet
->inet_dport
&& inet
->inet_dport
!= rmt_port
) ||
669 (!ipv6_addr_any(&sk
->sk_v6_daddr
) &&
670 !ipv6_addr_equal(&sk
->sk_v6_daddr
, rmt_addr
)) ||
671 (sk
->sk_bound_dev_if
&& sk
->sk_bound_dev_if
!= dif
) ||
672 (!ipv6_addr_any(&sk
->sk_v6_rcv_saddr
) &&
673 !ipv6_addr_equal(&sk
->sk_v6_rcv_saddr
, loc_addr
)))
675 if (!inet6_mc_check(sk
, loc_addr
, rmt_addr
))
680 static void udp6_csum_zero_error(struct sk_buff
*skb
)
682 /* RFC 2460 section 8.1 says that we SHOULD log
683 * this error. Well, it is reasonable.
685 net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n",
686 &ipv6_hdr(skb
)->saddr
, ntohs(udp_hdr(skb
)->source
),
687 &ipv6_hdr(skb
)->daddr
, ntohs(udp_hdr(skb
)->dest
));
691 * Note: called only from the BH handler context,
692 * so we don't need to lock the hashes.
694 static int __udp6_lib_mcast_deliver(struct net
*net
, struct sk_buff
*skb
,
695 const struct in6_addr
*saddr
, const struct in6_addr
*daddr
,
696 struct udp_table
*udptable
, int proto
)
698 struct sock
*sk
, *first
= NULL
;
699 const struct udphdr
*uh
= udp_hdr(skb
);
700 unsigned short hnum
= ntohs(uh
->dest
);
701 struct udp_hslot
*hslot
= udp_hashslot(udptable
, net
, hnum
);
702 unsigned int offset
= offsetof(typeof(*sk
), sk_node
);
703 unsigned int hash2
= 0, hash2_any
= 0, use_hash2
= (hslot
->count
> 10);
704 int dif
= inet6_iif(skb
);
705 struct hlist_node
*node
;
706 struct sk_buff
*nskb
;
709 hash2_any
= udp6_portaddr_hash(net
, &in6addr_any
, hnum
) &
711 hash2
= udp6_portaddr_hash(net
, daddr
, hnum
) & udptable
->mask
;
713 hslot
= &udptable
->hash2
[hash2
];
714 offset
= offsetof(typeof(*sk
), __sk_common
.skc_portaddr_node
);
717 sk_for_each_entry_offset_rcu(sk
, node
, &hslot
->head
, offset
) {
718 if (!__udp_v6_is_mcast_sock(net
, sk
, uh
->dest
, daddr
,
719 uh
->source
, saddr
, dif
, hnum
))
721 /* If zero checksum and no_check is not on for
722 * the socket then skip it.
724 if (!uh
->check
&& !udp_sk(sk
)->no_check6_rx
)
730 nskb
= skb_clone(skb
, GFP_ATOMIC
);
731 if (unlikely(!nskb
)) {
732 atomic_inc(&sk
->sk_drops
);
733 __UDP6_INC_STATS(net
, UDP_MIB_RCVBUFERRORS
,
735 __UDP6_INC_STATS(net
, UDP_MIB_INERRORS
,
740 if (udpv6_queue_rcv_skb(sk
, nskb
) > 0)
744 /* Also lookup *:port if we are using hash2 and haven't done so yet. */
745 if (use_hash2
&& hash2
!= hash2_any
) {
751 if (udpv6_queue_rcv_skb(first
, skb
) > 0)
755 __UDP6_INC_STATS(net
, UDP_MIB_IGNOREDMULTI
,
756 proto
== IPPROTO_UDPLITE
);
761 int __udp6_lib_rcv(struct sk_buff
*skb
, struct udp_table
*udptable
,
764 const struct in6_addr
*saddr
, *daddr
;
765 struct net
*net
= dev_net(skb
->dev
);
770 if (!pskb_may_pull(skb
, sizeof(struct udphdr
)))
773 saddr
= &ipv6_hdr(skb
)->saddr
;
774 daddr
= &ipv6_hdr(skb
)->daddr
;
777 ulen
= ntohs(uh
->len
);
781 if (proto
== IPPROTO_UDP
) {
782 /* UDP validates ulen. */
784 /* Check for jumbo payload */
788 if (ulen
< sizeof(*uh
))
791 if (ulen
< skb
->len
) {
792 if (pskb_trim_rcsum(skb
, ulen
))
794 saddr
= &ipv6_hdr(skb
)->saddr
;
795 daddr
= &ipv6_hdr(skb
)->daddr
;
800 if (udp6_csum_init(skb
, uh
, proto
))
804 * Multicast receive code
806 if (ipv6_addr_is_multicast(daddr
))
807 return __udp6_lib_mcast_deliver(net
, skb
,
808 saddr
, daddr
, udptable
, proto
);
813 * check socket cache ... must talk to Alan about his plans
814 * for sock caches... i'll skip this for now.
816 sk
= __udp6_lib_lookup_skb(skb
, uh
->source
, uh
->dest
, udptable
);
820 if (!uh
->check
&& !udp_sk(sk
)->no_check6_rx
) {
821 udp6_csum_zero_error(skb
);
825 if (inet_get_convert_csum(sk
) && uh
->check
&& !IS_UDPLITE(sk
))
826 skb_checksum_try_convert(skb
, IPPROTO_UDP
, uh
->check
,
829 ret
= udpv6_queue_rcv_skb(sk
, skb
);
831 /* a return value > 0 means to resubmit the input */
839 udp6_csum_zero_error(skb
);
843 if (!xfrm6_policy_check(NULL
, XFRM_POLICY_IN
, skb
))
846 if (udp_lib_checksum_complete(skb
))
849 __UDP6_INC_STATS(net
, UDP_MIB_NOPORTS
, proto
== IPPROTO_UDPLITE
);
850 icmpv6_send(skb
, ICMPV6_DEST_UNREACH
, ICMPV6_PORT_UNREACH
, 0);
856 net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n",
857 proto
== IPPROTO_UDPLITE
? "-Lite" : "",
858 saddr
, ntohs(uh
->source
),
860 daddr
, ntohs(uh
->dest
));
863 __UDP6_INC_STATS(net
, UDP_MIB_CSUMERRORS
, proto
== IPPROTO_UDPLITE
);
865 __UDP6_INC_STATS(net
, UDP_MIB_INERRORS
, proto
== IPPROTO_UDPLITE
);
871 static struct sock
*__udp6_lib_demux_lookup(struct net
*net
,
872 __be16 loc_port
, const struct in6_addr
*loc_addr
,
873 __be16 rmt_port
, const struct in6_addr
*rmt_addr
,
876 unsigned short hnum
= ntohs(loc_port
);
877 unsigned int hash2
= udp6_portaddr_hash(net
, loc_addr
, hnum
);
878 unsigned int slot2
= hash2
& udp_table
.mask
;
879 struct udp_hslot
*hslot2
= &udp_table
.hash2
[slot2
];
880 const __portpair ports
= INET_COMBINED_PORTS(rmt_port
, hnum
);
883 udp_portaddr_for_each_entry_rcu(sk
, &hslot2
->head
) {
884 if (INET6_MATCH(sk
, net
, rmt_addr
, loc_addr
, ports
, dif
))
886 /* Only check first socket in chain */
892 static void udp_v6_early_demux(struct sk_buff
*skb
)
894 struct net
*net
= dev_net(skb
->dev
);
895 const struct udphdr
*uh
;
897 struct dst_entry
*dst
;
898 int dif
= skb
->dev
->ifindex
;
900 if (!pskb_may_pull(skb
, skb_transport_offset(skb
) +
901 sizeof(struct udphdr
)))
906 if (skb
->pkt_type
== PACKET_HOST
)
907 sk
= __udp6_lib_demux_lookup(net
, uh
->dest
,
908 &ipv6_hdr(skb
)->daddr
,
909 uh
->source
, &ipv6_hdr(skb
)->saddr
,
914 if (!sk
|| !atomic_inc_not_zero_hint(&sk
->sk_refcnt
, 2))
918 skb
->destructor
= sock_efree
;
919 dst
= READ_ONCE(sk
->sk_rx_dst
);
922 dst
= dst_check(dst
, inet6_sk(sk
)->rx_dst_cookie
);
924 /* set noref for now.
925 * any place which wants to hold dst has to call
928 skb_dst_set_noref(skb
, dst
);
932 static __inline__
int udpv6_rcv(struct sk_buff
*skb
)
934 return __udp6_lib_rcv(skb
, &udp_table
, IPPROTO_UDP
);
938 * Throw away all pending data and cancel the corking. Socket is locked.
940 static void udp_v6_flush_pending_frames(struct sock
*sk
)
942 struct udp_sock
*up
= udp_sk(sk
);
944 if (up
->pending
== AF_INET
)
945 udp_flush_pending_frames(sk
);
946 else if (up
->pending
) {
949 ip6_flush_pending_frames(sk
);
954 * udp6_hwcsum_outgoing - handle outgoing HW checksumming
955 * @sk: socket we are sending on
956 * @skb: sk_buff containing the filled-in UDP header
957 * (checksum field must be zeroed out)
959 static void udp6_hwcsum_outgoing(struct sock
*sk
, struct sk_buff
*skb
,
960 const struct in6_addr
*saddr
,
961 const struct in6_addr
*daddr
, int len
)
964 struct udphdr
*uh
= udp_hdr(skb
);
965 struct sk_buff
*frags
= skb_shinfo(skb
)->frag_list
;
969 /* Only one fragment on the socket. */
970 skb
->csum_start
= skb_transport_header(skb
) - skb
->head
;
971 skb
->csum_offset
= offsetof(struct udphdr
, check
);
972 uh
->check
= ~csum_ipv6_magic(saddr
, daddr
, len
, IPPROTO_UDP
, 0);
975 * HW-checksum won't work as there are two or more
976 * fragments on the socket so that all csums of sk_buffs
979 offset
= skb_transport_offset(skb
);
980 skb
->csum
= skb_checksum(skb
, offset
, skb
->len
- offset
, 0);
982 skb
->ip_summed
= CHECKSUM_NONE
;
985 csum
= csum_add(csum
, frags
->csum
);
986 } while ((frags
= frags
->next
));
988 uh
->check
= csum_ipv6_magic(saddr
, daddr
, len
, IPPROTO_UDP
,
991 uh
->check
= CSUM_MANGLED_0
;
999 static int udp_v6_send_skb(struct sk_buff
*skb
, struct flowi6
*fl6
)
1001 struct sock
*sk
= skb
->sk
;
1004 int is_udplite
= IS_UDPLITE(sk
);
1006 int offset
= skb_transport_offset(skb
);
1007 int len
= skb
->len
- offset
;
1010 * Create a UDP header
1013 uh
->source
= fl6
->fl6_sport
;
1014 uh
->dest
= fl6
->fl6_dport
;
1015 uh
->len
= htons(len
);
1019 csum
= udplite_csum(skb
);
1020 else if (udp_sk(sk
)->no_check6_tx
) { /* UDP csum disabled */
1021 skb
->ip_summed
= CHECKSUM_NONE
;
1023 } else if (skb
->ip_summed
== CHECKSUM_PARTIAL
) { /* UDP hardware csum */
1024 udp6_hwcsum_outgoing(sk
, skb
, &fl6
->saddr
, &fl6
->daddr
, len
);
1027 csum
= udp_csum(skb
);
1029 /* add protocol-dependent pseudo-header */
1030 uh
->check
= csum_ipv6_magic(&fl6
->saddr
, &fl6
->daddr
,
1031 len
, fl6
->flowi6_proto
, csum
);
1033 uh
->check
= CSUM_MANGLED_0
;
1036 err
= ip6_send_skb(skb
);
1038 if (err
== -ENOBUFS
&& !inet6_sk(sk
)->recverr
) {
1039 UDP6_INC_STATS(sock_net(sk
),
1040 UDP_MIB_SNDBUFERRORS
, is_udplite
);
1044 UDP6_INC_STATS(sock_net(sk
),
1045 UDP_MIB_OUTDATAGRAMS
, is_udplite
);
1050 static int udp_v6_push_pending_frames(struct sock
*sk
)
1052 struct sk_buff
*skb
;
1053 struct udp_sock
*up
= udp_sk(sk
);
1057 if (up
->pending
== AF_INET
)
1058 return udp_push_pending_frames(sk
);
1060 /* ip6_finish_skb will release the cork, so make a copy of
1063 fl6
= inet_sk(sk
)->cork
.fl
.u
.ip6
;
1065 skb
= ip6_finish_skb(sk
);
1069 err
= udp_v6_send_skb(skb
, &fl6
);
1077 int udpv6_sendmsg(struct sock
*sk
, struct msghdr
*msg
, size_t len
)
1079 struct ipv6_txoptions opt_space
;
1080 struct udp_sock
*up
= udp_sk(sk
);
1081 struct inet_sock
*inet
= inet_sk(sk
);
1082 struct ipv6_pinfo
*np
= inet6_sk(sk
);
1083 DECLARE_SOCKADDR(struct sockaddr_in6
*, sin6
, msg
->msg_name
);
1084 struct in6_addr
*daddr
, *final_p
, final
;
1085 struct ipv6_txoptions
*opt
= NULL
;
1086 struct ipv6_txoptions
*opt_to_free
= NULL
;
1087 struct ip6_flowlabel
*flowlabel
= NULL
;
1089 struct dst_entry
*dst
;
1090 struct ipcm6_cookie ipc6
;
1091 int addr_len
= msg
->msg_namelen
;
1093 int corkreq
= up
->corkflag
|| msg
->msg_flags
&MSG_MORE
;
1096 int is_udplite
= IS_UDPLITE(sk
);
1097 int (*getfrag
)(void *, char *, int, int, int, struct sk_buff
*);
1098 struct sockcm_cookie sockc
;
1103 sockc
.tsflags
= sk
->sk_tsflags
;
1105 /* destination address check */
1107 if (addr_len
< offsetof(struct sockaddr
, sa_data
))
1110 switch (sin6
->sin6_family
) {
1112 if (addr_len
< SIN6_LEN_RFC2133
)
1114 daddr
= &sin6
->sin6_addr
;
1115 if (ipv6_addr_any(daddr
) &&
1116 ipv6_addr_v4mapped(&np
->saddr
))
1117 ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK
),
1121 goto do_udp_sendmsg
;
1123 msg
->msg_name
= sin6
= NULL
;
1124 msg
->msg_namelen
= addr_len
= 0;
1130 } else if (!up
->pending
) {
1131 if (sk
->sk_state
!= TCP_ESTABLISHED
)
1132 return -EDESTADDRREQ
;
1133 daddr
= &sk
->sk_v6_daddr
;
1138 if (ipv6_addr_v4mapped(daddr
)) {
1139 struct sockaddr_in sin
;
1140 sin
.sin_family
= AF_INET
;
1141 sin
.sin_port
= sin6
? sin6
->sin6_port
: inet
->inet_dport
;
1142 sin
.sin_addr
.s_addr
= daddr
->s6_addr32
[3];
1143 msg
->msg_name
= &sin
;
1144 msg
->msg_namelen
= sizeof(sin
);
1146 if (__ipv6_only_sock(sk
))
1147 return -ENETUNREACH
;
1148 return udp_sendmsg(sk
, msg
, len
);
1152 if (up
->pending
== AF_INET
)
1153 return udp_sendmsg(sk
, msg
, len
);
1155 /* Rough check on arithmetic overflow,
1156 better check is made in ip6_append_data().
1158 if (len
> INT_MAX
- sizeof(struct udphdr
))
1161 getfrag
= is_udplite
? udplite_getfrag
: ip_generic_getfrag
;
1164 * There are pending frames.
1165 * The socket lock must be held while it's corked.
1168 if (likely(up
->pending
)) {
1169 if (unlikely(up
->pending
!= AF_INET6
)) {
1171 return -EAFNOSUPPORT
;
1174 goto do_append_data
;
1178 ulen
+= sizeof(struct udphdr
);
1180 memset(&fl6
, 0, sizeof(fl6
));
1183 if (sin6
->sin6_port
== 0)
1186 fl6
.fl6_dport
= sin6
->sin6_port
;
1187 daddr
= &sin6
->sin6_addr
;
1190 fl6
.flowlabel
= sin6
->sin6_flowinfo
&IPV6_FLOWINFO_MASK
;
1191 if (fl6
.flowlabel
&IPV6_FLOWLABEL_MASK
) {
1192 flowlabel
= fl6_sock_lookup(sk
, fl6
.flowlabel
);
1199 * Otherwise it will be difficult to maintain
1202 if (sk
->sk_state
== TCP_ESTABLISHED
&&
1203 ipv6_addr_equal(daddr
, &sk
->sk_v6_daddr
))
1204 daddr
= &sk
->sk_v6_daddr
;
1206 if (addr_len
>= sizeof(struct sockaddr_in6
) &&
1207 sin6
->sin6_scope_id
&&
1208 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr
)))
1209 fl6
.flowi6_oif
= sin6
->sin6_scope_id
;
1211 if (sk
->sk_state
!= TCP_ESTABLISHED
)
1212 return -EDESTADDRREQ
;
1214 fl6
.fl6_dport
= inet
->inet_dport
;
1215 daddr
= &sk
->sk_v6_daddr
;
1216 fl6
.flowlabel
= np
->flow_label
;
1220 if (!fl6
.flowi6_oif
)
1221 fl6
.flowi6_oif
= sk
->sk_bound_dev_if
;
1223 if (!fl6
.flowi6_oif
)
1224 fl6
.flowi6_oif
= np
->sticky_pktinfo
.ipi6_ifindex
;
1226 fl6
.flowi6_mark
= sk
->sk_mark
;
1227 fl6
.flowi6_uid
= sk
->sk_uid
;
1229 if (msg
->msg_controllen
) {
1231 memset(opt
, 0, sizeof(struct ipv6_txoptions
));
1232 opt
->tot_len
= sizeof(*opt
);
1235 err
= ip6_datagram_send_ctl(sock_net(sk
), sk
, msg
, &fl6
, &ipc6
, &sockc
);
1237 fl6_sock_release(flowlabel
);
1240 if ((fl6
.flowlabel
&IPV6_FLOWLABEL_MASK
) && !flowlabel
) {
1241 flowlabel
= fl6_sock_lookup(sk
, fl6
.flowlabel
);
1245 if (!(opt
->opt_nflen
|opt
->opt_flen
))
1250 opt
= txopt_get(np
);
1254 opt
= fl6_merge_options(&opt_space
, flowlabel
, opt
);
1255 opt
= ipv6_fixup_options(&opt_space
, opt
);
1258 fl6
.flowi6_proto
= sk
->sk_protocol
;
1259 if (!ipv6_addr_any(daddr
))
1262 fl6
.daddr
.s6_addr
[15] = 0x1; /* :: means loopback (BSD'ism) */
1263 if (ipv6_addr_any(&fl6
.saddr
) && !ipv6_addr_any(&np
->saddr
))
1264 fl6
.saddr
= np
->saddr
;
1265 fl6
.fl6_sport
= inet
->inet_sport
;
1267 final_p
= fl6_update_dst(&fl6
, opt
, &final
);
1271 if (!fl6
.flowi6_oif
&& ipv6_addr_is_multicast(&fl6
.daddr
)) {
1272 fl6
.flowi6_oif
= np
->mcast_oif
;
1274 } else if (!fl6
.flowi6_oif
)
1275 fl6
.flowi6_oif
= np
->ucast_oif
;
1277 security_sk_classify_flow(sk
, flowi6_to_flowi(&fl6
));
1279 if (ipc6
.tclass
< 0)
1280 ipc6
.tclass
= np
->tclass
;
1282 fl6
.flowlabel
= ip6_make_flowinfo(ipc6
.tclass
, fl6
.flowlabel
);
1284 dst
= ip6_sk_dst_lookup_flow(sk
, &fl6
, final_p
);
1291 if (ipc6
.hlimit
< 0)
1292 ipc6
.hlimit
= ip6_sk_dst_hoplimit(np
, &fl6
, dst
);
1294 if (msg
->msg_flags
&MSG_CONFIRM
)
1298 /* Lockless fast path for the non-corking case */
1300 struct sk_buff
*skb
;
1302 skb
= ip6_make_skb(sk
, getfrag
, msg
, ulen
,
1303 sizeof(struct udphdr
), &ipc6
,
1304 &fl6
, (struct rt6_info
*)dst
,
1305 msg
->msg_flags
, &sockc
);
1307 if (!IS_ERR_OR_NULL(skb
))
1308 err
= udp_v6_send_skb(skb
, &fl6
);
1313 if (unlikely(up
->pending
)) {
1314 /* The socket is already corked while preparing it. */
1315 /* ... which is an evident application bug. --ANK */
1318 net_dbg_ratelimited("udp cork app bug 2\n");
1323 up
->pending
= AF_INET6
;
1326 if (ipc6
.dontfrag
< 0)
1327 ipc6
.dontfrag
= np
->dontfrag
;
1329 err
= ip6_append_data(sk
, getfrag
, msg
, ulen
, sizeof(struct udphdr
),
1330 &ipc6
, &fl6
, (struct rt6_info
*)dst
,
1331 corkreq
? msg
->msg_flags
|MSG_MORE
: msg
->msg_flags
, &sockc
);
1333 udp_v6_flush_pending_frames(sk
);
1335 err
= udp_v6_push_pending_frames(sk
);
1336 else if (unlikely(skb_queue_empty(&sk
->sk_write_queue
)))
1340 err
= np
->recverr
? net_xmit_errno(err
) : 0;
1346 ip6_dst_store(sk
, dst
,
1347 ipv6_addr_equal(&fl6
.daddr
, &sk
->sk_v6_daddr
) ?
1348 &sk
->sk_v6_daddr
: NULL
,
1349 #ifdef CONFIG_IPV6_SUBTREES
1350 ipv6_addr_equal(&fl6
.saddr
, &np
->saddr
) ?
1362 fl6_sock_release(flowlabel
);
1363 txopt_put(opt_to_free
);
1367 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
1368 * ENOBUFS might not be good (it's not tunable per se), but otherwise
1369 * we don't have a good statistic (IpOutDiscards but it can be too many
1370 * things). We could add another new stat but at least for now that
1371 * seems like overkill.
1373 if (err
== -ENOBUFS
|| test_bit(SOCK_NOSPACE
, &sk
->sk_socket
->flags
)) {
1374 UDP6_INC_STATS(sock_net(sk
),
1375 UDP_MIB_SNDBUFERRORS
, is_udplite
);
1380 if (msg
->msg_flags
& MSG_PROBE
)
1381 dst_confirm_neigh(dst
, &fl6
.daddr
);
1382 if (!(msg
->msg_flags
&MSG_PROBE
) || len
)
1383 goto back_from_confirm
;
1388 void udpv6_destroy_sock(struct sock
*sk
)
1390 struct udp_sock
*up
= udp_sk(sk
);
1392 udp_v6_flush_pending_frames(sk
);
1395 if (static_key_false(&udpv6_encap_needed
) && up
->encap_type
) {
1396 void (*encap_destroy
)(struct sock
*sk
);
1397 encap_destroy
= ACCESS_ONCE(up
->encap_destroy
);
1402 inet6_destroy_sock(sk
);
1406 * Socket option code for UDP
1408 int udpv6_setsockopt(struct sock
*sk
, int level
, int optname
,
1409 char __user
*optval
, unsigned int optlen
)
1411 if (level
== SOL_UDP
|| level
== SOL_UDPLITE
)
1412 return udp_lib_setsockopt(sk
, level
, optname
, optval
, optlen
,
1413 udp_v6_push_pending_frames
);
1414 return ipv6_setsockopt(sk
, level
, optname
, optval
, optlen
);
1417 #ifdef CONFIG_COMPAT
1418 int compat_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 compat_ipv6_setsockopt(sk
, level
, optname
, optval
, optlen
);
1428 int udpv6_getsockopt(struct sock
*sk
, int level
, int optname
,
1429 char __user
*optval
, int __user
*optlen
)
1431 if (level
== SOL_UDP
|| level
== SOL_UDPLITE
)
1432 return udp_lib_getsockopt(sk
, level
, optname
, optval
, optlen
);
1433 return ipv6_getsockopt(sk
, level
, optname
, optval
, optlen
);
1436 #ifdef CONFIG_COMPAT
1437 int compat_udpv6_getsockopt(struct sock
*sk
, int level
, int optname
,
1438 char __user
*optval
, int __user
*optlen
)
1440 if (level
== SOL_UDP
|| level
== SOL_UDPLITE
)
1441 return udp_lib_getsockopt(sk
, level
, optname
, optval
, optlen
);
1442 return compat_ipv6_getsockopt(sk
, level
, optname
, optval
, optlen
);
1446 static struct inet6_protocol udpv6_protocol
= {
1447 .early_demux
= udp_v6_early_demux
,
1448 .early_demux_handler
= udp_v6_early_demux
,
1449 .handler
= udpv6_rcv
,
1450 .err_handler
= udpv6_err
,
1451 .flags
= INET6_PROTO_NOPOLICY
|INET6_PROTO_FINAL
,
1454 /* ------------------------------------------------------------------------ */
1455 #ifdef CONFIG_PROC_FS
1456 int udp6_seq_show(struct seq_file
*seq
, void *v
)
1458 if (v
== SEQ_START_TOKEN
) {
1459 seq_puts(seq
, IPV6_SEQ_DGRAM_HEADER
);
1461 int bucket
= ((struct udp_iter_state
*)seq
->private)->bucket
;
1462 struct inet_sock
*inet
= inet_sk(v
);
1463 __u16 srcp
= ntohs(inet
->inet_sport
);
1464 __u16 destp
= ntohs(inet
->inet_dport
);
1465 ip6_dgram_sock_seq_show(seq
, v
, srcp
, destp
, bucket
);
1470 static const struct file_operations udp6_afinfo_seq_fops
= {
1471 .owner
= THIS_MODULE
,
1472 .open
= udp_seq_open
,
1474 .llseek
= seq_lseek
,
1475 .release
= seq_release_net
1478 static struct udp_seq_afinfo udp6_seq_afinfo
= {
1481 .udp_table
= &udp_table
,
1482 .seq_fops
= &udp6_afinfo_seq_fops
,
1484 .show
= udp6_seq_show
,
1488 int __net_init
udp6_proc_init(struct net
*net
)
1490 return udp_proc_register(net
, &udp6_seq_afinfo
);
1493 void udp6_proc_exit(struct net
*net
)
1495 udp_proc_unregister(net
, &udp6_seq_afinfo
);
1497 #endif /* CONFIG_PROC_FS */
1499 /* ------------------------------------------------------------------------ */
1501 struct proto udpv6_prot
= {
1503 .owner
= THIS_MODULE
,
1504 .close
= udp_lib_close
,
1505 .connect
= ip6_datagram_connect
,
1506 .disconnect
= udp_disconnect
,
1508 .init
= udp_init_sock
,
1509 .destroy
= udpv6_destroy_sock
,
1510 .setsockopt
= udpv6_setsockopt
,
1511 .getsockopt
= udpv6_getsockopt
,
1512 .sendmsg
= udpv6_sendmsg
,
1513 .recvmsg
= udpv6_recvmsg
,
1514 .release_cb
= ip6_datagram_release_cb
,
1515 .hash
= udp_lib_hash
,
1516 .unhash
= udp_lib_unhash
,
1517 .rehash
= udp_v6_rehash
,
1518 .get_port
= udp_v6_get_port
,
1519 .memory_allocated
= &udp_memory_allocated
,
1520 .sysctl_mem
= sysctl_udp_mem
,
1521 .sysctl_wmem
= &sysctl_udp_wmem_min
,
1522 .sysctl_rmem
= &sysctl_udp_rmem_min
,
1523 .obj_size
= sizeof(struct udp6_sock
),
1524 .h
.udp_table
= &udp_table
,
1525 #ifdef CONFIG_COMPAT
1526 .compat_setsockopt
= compat_udpv6_setsockopt
,
1527 .compat_getsockopt
= compat_udpv6_getsockopt
,
1529 .diag_destroy
= udp_abort
,
1532 static struct inet_protosw udpv6_protosw
= {
1534 .protocol
= IPPROTO_UDP
,
1535 .prot
= &udpv6_prot
,
1536 .ops
= &inet6_dgram_ops
,
1537 .flags
= INET_PROTOSW_PERMANENT
,
1540 int __init
udpv6_init(void)
1544 ret
= inet6_add_protocol(&udpv6_protocol
, IPPROTO_UDP
);
1548 ret
= inet6_register_protosw(&udpv6_protosw
);
1550 goto out_udpv6_protocol
;
1555 inet6_del_protocol(&udpv6_protocol
, IPPROTO_UDP
);
1559 void udpv6_exit(void)
1561 inet6_unregister_protosw(&udpv6_protosw
);
1562 inet6_del_protocol(&udpv6_protocol
, IPPROTO_UDP
);