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>
49 #include <linux/proc_fs.h>
50 #include <linux/seq_file.h>
51 #include <trace/events/skb.h>
54 int ipv6_rcv_saddr_equal(const struct sock
*sk
, const struct sock
*sk2
)
56 const struct in6_addr
*sk_rcv_saddr6
= &inet6_sk(sk
)->rcv_saddr
;
57 const struct in6_addr
*sk2_rcv_saddr6
= inet6_rcv_saddr(sk2
);
58 __be32 sk1_rcv_saddr
= sk_rcv_saddr(sk
);
59 __be32 sk2_rcv_saddr
= sk_rcv_saddr(sk2
);
60 int sk_ipv6only
= ipv6_only_sock(sk
);
61 int sk2_ipv6only
= inet_v6_ipv6only(sk2
);
62 int addr_type
= ipv6_addr_type(sk_rcv_saddr6
);
63 int addr_type2
= sk2_rcv_saddr6
? ipv6_addr_type(sk2_rcv_saddr6
) : IPV6_ADDR_MAPPED
;
65 /* if both are mapped, treat as IPv4 */
66 if (addr_type
== IPV6_ADDR_MAPPED
&& addr_type2
== IPV6_ADDR_MAPPED
)
67 return (!sk2_ipv6only
&&
68 (!sk1_rcv_saddr
|| !sk2_rcv_saddr
||
69 sk1_rcv_saddr
== sk2_rcv_saddr
));
71 if (addr_type2
== IPV6_ADDR_ANY
&&
72 !(sk2_ipv6only
&& addr_type
== IPV6_ADDR_MAPPED
))
75 if (addr_type
== IPV6_ADDR_ANY
&&
76 !(sk_ipv6only
&& addr_type2
== IPV6_ADDR_MAPPED
))
80 ipv6_addr_equal(sk_rcv_saddr6
, sk2_rcv_saddr6
))
86 static unsigned int udp6_portaddr_hash(struct net
*net
,
87 const struct in6_addr
*addr6
,
90 unsigned int hash
, mix
= net_hash_mix(net
);
92 if (ipv6_addr_any(addr6
))
93 hash
= jhash_1word(0, mix
);
94 else if (ipv6_addr_v4mapped(addr6
))
95 hash
= jhash_1word((__force u32
)addr6
->s6_addr32
[3], mix
);
97 hash
= jhash2((__force u32
*)addr6
->s6_addr32
, 4, mix
);
103 int udp_v6_get_port(struct sock
*sk
, unsigned short snum
)
105 unsigned int hash2_nulladdr
=
106 udp6_portaddr_hash(sock_net(sk
), &in6addr_any
, snum
);
107 unsigned int hash2_partial
=
108 udp6_portaddr_hash(sock_net(sk
), &inet6_sk(sk
)->rcv_saddr
, 0);
110 /* precompute partial secondary hash */
111 udp_sk(sk
)->udp_portaddr_hash
= hash2_partial
;
112 return udp_lib_get_port(sk
, snum
, ipv6_rcv_saddr_equal
, hash2_nulladdr
);
115 static void udp_v6_rehash(struct sock
*sk
)
117 u16 new_hash
= udp6_portaddr_hash(sock_net(sk
),
118 &inet6_sk(sk
)->rcv_saddr
,
119 inet_sk(sk
)->inet_num
);
121 udp_lib_rehash(sk
, new_hash
);
124 static inline int compute_score(struct sock
*sk
, struct net
*net
,
126 const struct in6_addr
*saddr
, __be16 sport
,
127 const struct in6_addr
*daddr
, __be16 dport
,
132 if (net_eq(sock_net(sk
), net
) && udp_sk(sk
)->udp_port_hash
== hnum
&&
133 sk
->sk_family
== PF_INET6
) {
134 struct ipv6_pinfo
*np
= inet6_sk(sk
);
135 struct inet_sock
*inet
= inet_sk(sk
);
138 if (inet
->inet_dport
) {
139 if (inet
->inet_dport
!= sport
)
143 if (!ipv6_addr_any(&np
->rcv_saddr
)) {
144 if (!ipv6_addr_equal(&np
->rcv_saddr
, daddr
))
148 if (!ipv6_addr_any(&np
->daddr
)) {
149 if (!ipv6_addr_equal(&np
->daddr
, saddr
))
153 if (sk
->sk_bound_dev_if
) {
154 if (sk
->sk_bound_dev_if
!= dif
)
162 #define SCORE2_MAX (1 + 1 + 1)
163 static inline int compute_score2(struct sock
*sk
, struct net
*net
,
164 const struct in6_addr
*saddr
, __be16 sport
,
165 const struct in6_addr
*daddr
, unsigned short hnum
,
170 if (net_eq(sock_net(sk
), net
) && udp_sk(sk
)->udp_port_hash
== hnum
&&
171 sk
->sk_family
== PF_INET6
) {
172 struct ipv6_pinfo
*np
= inet6_sk(sk
);
173 struct inet_sock
*inet
= inet_sk(sk
);
175 if (!ipv6_addr_equal(&np
->rcv_saddr
, daddr
))
178 if (inet
->inet_dport
) {
179 if (inet
->inet_dport
!= sport
)
183 if (!ipv6_addr_any(&np
->daddr
)) {
184 if (!ipv6_addr_equal(&np
->daddr
, saddr
))
188 if (sk
->sk_bound_dev_if
) {
189 if (sk
->sk_bound_dev_if
!= dif
)
198 /* called with read_rcu_lock() */
199 static struct sock
*udp6_lib_lookup2(struct net
*net
,
200 const struct in6_addr
*saddr
, __be16 sport
,
201 const struct in6_addr
*daddr
, unsigned int hnum
, int dif
,
202 struct udp_hslot
*hslot2
, unsigned int slot2
)
204 struct sock
*sk
, *result
;
205 struct hlist_nulls_node
*node
;
211 udp_portaddr_for_each_entry_rcu(sk
, node
, &hslot2
->head
) {
212 score
= compute_score2(sk
, net
, saddr
, sport
,
214 if (score
> badness
) {
217 if (score
== SCORE2_MAX
)
222 * if the nulls value we got at the end of this lookup is
223 * not the expected one, we must restart lookup.
224 * We probably met an item that was moved to another chain.
226 if (get_nulls_value(node
) != slot2
)
231 if (unlikely(!atomic_inc_not_zero_hint(&result
->sk_refcnt
, 2)))
233 else if (unlikely(compute_score2(result
, net
, saddr
, sport
,
234 daddr
, hnum
, dif
) < badness
)) {
242 struct sock
*__udp6_lib_lookup(struct net
*net
,
243 const struct in6_addr
*saddr
, __be16 sport
,
244 const struct in6_addr
*daddr
, __be16 dport
,
245 int dif
, struct udp_table
*udptable
)
247 struct sock
*sk
, *result
;
248 struct hlist_nulls_node
*node
;
249 unsigned short hnum
= ntohs(dport
);
250 unsigned int hash2
, slot2
, slot
= udp_hashfn(net
, hnum
, udptable
->mask
);
251 struct udp_hslot
*hslot2
, *hslot
= &udptable
->hash
[slot
];
255 if (hslot
->count
> 10) {
256 hash2
= udp6_portaddr_hash(net
, daddr
, hnum
);
257 slot2
= hash2
& udptable
->mask
;
258 hslot2
= &udptable
->hash2
[slot2
];
259 if (hslot
->count
< hslot2
->count
)
262 result
= udp6_lib_lookup2(net
, saddr
, sport
,
266 hash2
= udp6_portaddr_hash(net
, &in6addr_any
, hnum
);
267 slot2
= hash2
& udptable
->mask
;
268 hslot2
= &udptable
->hash2
[slot2
];
269 if (hslot
->count
< hslot2
->count
)
272 result
= udp6_lib_lookup2(net
, saddr
, sport
,
273 &in6addr_any
, hnum
, dif
,
282 sk_nulls_for_each_rcu(sk
, node
, &hslot
->head
) {
283 score
= compute_score(sk
, net
, hnum
, saddr
, sport
, daddr
, dport
, dif
);
284 if (score
> badness
) {
290 * if the nulls value we got at the end of this lookup is
291 * not the expected one, we must restart lookup.
292 * We probably met an item that was moved to another chain.
294 if (get_nulls_value(node
) != slot
)
298 if (unlikely(!atomic_inc_not_zero_hint(&result
->sk_refcnt
, 2)))
300 else if (unlikely(compute_score(result
, net
, hnum
, saddr
, sport
,
301 daddr
, dport
, dif
) < badness
)) {
309 EXPORT_SYMBOL_GPL(__udp6_lib_lookup
);
311 static struct sock
*__udp6_lib_lookup_skb(struct sk_buff
*skb
,
312 __be16 sport
, __be16 dport
,
313 struct udp_table
*udptable
)
316 const struct ipv6hdr
*iph
= ipv6_hdr(skb
);
318 if (unlikely(sk
= skb_steal_sock(skb
)))
320 return __udp6_lib_lookup(dev_net(skb_dst(skb
)->dev
), &iph
->saddr
, sport
,
321 &iph
->daddr
, dport
, inet6_iif(skb
),
325 struct sock
*udp6_lib_lookup(struct net
*net
, const struct in6_addr
*saddr
, __be16 sport
,
326 const struct in6_addr
*daddr
, __be16 dport
, int dif
)
328 return __udp6_lib_lookup(net
, saddr
, sport
, daddr
, dport
, dif
, &udp_table
);
330 EXPORT_SYMBOL_GPL(udp6_lib_lookup
);
334 * This should be easy, if there is something there we
335 * return it, otherwise we block.
338 int udpv6_recvmsg(struct kiocb
*iocb
, struct sock
*sk
,
339 struct msghdr
*msg
, size_t len
,
340 int noblock
, int flags
, int *addr_len
)
342 struct ipv6_pinfo
*np
= inet6_sk(sk
);
343 struct inet_sock
*inet
= inet_sk(sk
);
345 unsigned int ulen
, copied
;
348 int is_udplite
= IS_UDPLITE(sk
);
353 *addr_len
= sizeof(struct sockaddr_in6
);
355 if (flags
& MSG_ERRQUEUE
)
356 return ipv6_recv_error(sk
, msg
, len
);
358 if (np
->rxpmtu
&& np
->rxopt
.bits
.rxpmtu
)
359 return ipv6_recv_rxpmtu(sk
, msg
, len
);
362 skb
= __skb_recv_datagram(sk
, flags
| (noblock
? MSG_DONTWAIT
: 0),
363 &peeked
, &off
, &err
);
367 ulen
= skb
->len
- sizeof(struct udphdr
);
371 else if (copied
< ulen
)
372 msg
->msg_flags
|= MSG_TRUNC
;
374 is_udp4
= (skb
->protocol
== htons(ETH_P_IP
));
377 * If checksum is needed at all, try to do it while copying the
378 * data. If the data is truncated, or if we only want a partial
379 * coverage checksum (UDP-Lite), do it before the copy.
382 if (copied
< ulen
|| UDP_SKB_CB(skb
)->partial_cov
) {
383 if (udp_lib_checksum_complete(skb
))
387 if (skb_csum_unnecessary(skb
))
388 err
= skb_copy_datagram_iovec(skb
, sizeof(struct udphdr
),
389 msg
->msg_iov
, copied
);
391 err
= skb_copy_and_csum_datagram_iovec(skb
, sizeof(struct udphdr
), msg
->msg_iov
);
396 trace_kfree_skb(skb
, udpv6_recvmsg
);
401 UDP_INC_STATS_USER(sock_net(sk
),
402 UDP_MIB_INDATAGRAMS
, is_udplite
);
404 UDP6_INC_STATS_USER(sock_net(sk
),
405 UDP_MIB_INDATAGRAMS
, is_udplite
);
408 sock_recv_ts_and_drops(msg
, sk
, skb
);
410 /* Copy the address. */
412 struct sockaddr_in6
*sin6
;
414 sin6
= (struct sockaddr_in6
*) msg
->msg_name
;
415 sin6
->sin6_family
= AF_INET6
;
416 sin6
->sin6_port
= udp_hdr(skb
)->source
;
417 sin6
->sin6_flowinfo
= 0;
418 sin6
->sin6_scope_id
= 0;
421 ipv6_addr_set_v4mapped(ip_hdr(skb
)->saddr
,
424 sin6
->sin6_addr
= ipv6_hdr(skb
)->saddr
;
425 if (ipv6_addr_type(&sin6
->sin6_addr
) & IPV6_ADDR_LINKLOCAL
)
426 sin6
->sin6_scope_id
= IP6CB(skb
)->iif
;
431 if (inet
->cmsg_flags
)
432 ip_cmsg_recv(msg
, skb
);
435 datagram_recv_ctl(sk
, msg
, skb
);
439 if (flags
& MSG_TRUNC
)
443 skb_free_datagram_locked(sk
, skb
);
448 slow
= lock_sock_fast(sk
);
449 if (!skb_kill_datagram(sk
, skb
, flags
)) {
451 UDP_INC_STATS_USER(sock_net(sk
),
452 UDP_MIB_INERRORS
, is_udplite
);
454 UDP6_INC_STATS_USER(sock_net(sk
),
455 UDP_MIB_INERRORS
, is_udplite
);
457 unlock_sock_fast(sk
, slow
);
462 /* starting over for a new packet */
463 msg
->msg_flags
&= ~MSG_TRUNC
;
467 void __udp6_lib_err(struct sk_buff
*skb
, struct inet6_skb_parm
*opt
,
468 u8 type
, u8 code
, int offset
, __be32 info
,
469 struct udp_table
*udptable
)
471 struct ipv6_pinfo
*np
;
472 const struct ipv6hdr
*hdr
= (const struct ipv6hdr
*)skb
->data
;
473 const struct in6_addr
*saddr
= &hdr
->saddr
;
474 const struct in6_addr
*daddr
= &hdr
->daddr
;
475 struct udphdr
*uh
= (struct udphdr
*)(skb
->data
+offset
);
479 sk
= __udp6_lib_lookup(dev_net(skb
->dev
), daddr
, uh
->dest
,
480 saddr
, uh
->source
, inet6_iif(skb
), udptable
);
484 if (type
== ICMPV6_PKT_TOOBIG
)
485 ip6_sk_update_pmtu(skb
, sk
, info
);
486 if (type
== NDISC_REDIRECT
)
487 ip6_sk_redirect(skb
, sk
);
491 if (!icmpv6_err_convert(type
, code
, &err
) && !np
->recverr
)
494 if (sk
->sk_state
!= TCP_ESTABLISHED
&& !np
->recverr
)
498 ipv6_icmp_error(sk
, skb
, err
, uh
->dest
, ntohl(info
), (u8
*)(uh
+1));
501 sk
->sk_error_report(sk
);
506 static int __udpv6_queue_rcv_skb(struct sock
*sk
, struct sk_buff
*skb
)
510 if (!ipv6_addr_any(&inet6_sk(sk
)->daddr
))
511 sock_rps_save_rxhash(sk
, skb
);
513 rc
= sock_queue_rcv_skb(sk
, skb
);
515 int is_udplite
= IS_UDPLITE(sk
);
517 /* Note that an ENOMEM error is charged twice */
519 UDP6_INC_STATS_BH(sock_net(sk
),
520 UDP_MIB_RCVBUFERRORS
, is_udplite
);
521 UDP6_INC_STATS_BH(sock_net(sk
), UDP_MIB_INERRORS
, is_udplite
);
528 static __inline__
void udpv6_err(struct sk_buff
*skb
,
529 struct inet6_skb_parm
*opt
, u8 type
,
530 u8 code
, int offset
, __be32 info
)
532 __udp6_lib_err(skb
, opt
, type
, code
, offset
, info
, &udp_table
);
535 static struct static_key udpv6_encap_needed __read_mostly
;
536 void udpv6_encap_enable(void)
538 if (!static_key_enabled(&udpv6_encap_needed
))
539 static_key_slow_inc(&udpv6_encap_needed
);
541 EXPORT_SYMBOL(udpv6_encap_enable
);
543 int udpv6_queue_rcv_skb(struct sock
*sk
, struct sk_buff
*skb
)
545 struct udp_sock
*up
= udp_sk(sk
);
547 int is_udplite
= IS_UDPLITE(sk
);
549 if (!xfrm6_policy_check(sk
, XFRM_POLICY_IN
, skb
))
552 if (static_key_false(&udpv6_encap_needed
) && up
->encap_type
) {
553 int (*encap_rcv
)(struct sock
*sk
, struct sk_buff
*skb
);
556 * This is an encapsulation socket so pass the skb to
557 * the socket's udp_encap_rcv() hook. Otherwise, just
558 * fall through and pass this up the UDP socket.
559 * up->encap_rcv() returns the following value:
560 * =0 if skb was successfully passed to the encap
561 * handler or was discarded by it.
562 * >0 if skb should be passed on to UDP.
563 * <0 if skb should be resubmitted as proto -N
566 /* if we're overly short, let UDP handle it */
567 encap_rcv
= ACCESS_ONCE(up
->encap_rcv
);
568 if (skb
->len
> sizeof(struct udphdr
) && encap_rcv
!= NULL
) {
571 ret
= encap_rcv(sk
, skb
);
573 UDP_INC_STATS_BH(sock_net(sk
),
580 /* FALLTHROUGH -- it's a UDP Packet */
584 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
586 if ((is_udplite
& UDPLITE_RECV_CC
) && UDP_SKB_CB(skb
)->partial_cov
) {
588 if (up
->pcrlen
== 0) { /* full coverage was set */
589 LIMIT_NETDEBUG(KERN_WARNING
"UDPLITE6: partial coverage"
590 " %d while full coverage %d requested\n",
591 UDP_SKB_CB(skb
)->cscov
, skb
->len
);
594 if (UDP_SKB_CB(skb
)->cscov
< up
->pcrlen
) {
595 LIMIT_NETDEBUG(KERN_WARNING
"UDPLITE6: coverage %d "
596 "too small, need min %d\n",
597 UDP_SKB_CB(skb
)->cscov
, up
->pcrlen
);
602 if (rcu_access_pointer(sk
->sk_filter
)) {
603 if (udp_lib_checksum_complete(skb
))
607 if (sk_rcvqueues_full(sk
, skb
, sk
->sk_rcvbuf
))
614 if (!sock_owned_by_user(sk
))
615 rc
= __udpv6_queue_rcv_skb(sk
, skb
);
616 else if (sk_add_backlog(sk
, skb
, sk
->sk_rcvbuf
)) {
624 UDP6_INC_STATS_BH(sock_net(sk
), UDP_MIB_INERRORS
, is_udplite
);
625 atomic_inc(&sk
->sk_drops
);
630 static struct sock
*udp_v6_mcast_next(struct net
*net
, struct sock
*sk
,
631 __be16 loc_port
, const struct in6_addr
*loc_addr
,
632 __be16 rmt_port
, const struct in6_addr
*rmt_addr
,
635 struct hlist_nulls_node
*node
;
637 unsigned short num
= ntohs(loc_port
);
639 sk_nulls_for_each_from(s
, node
) {
640 struct inet_sock
*inet
= inet_sk(s
);
642 if (!net_eq(sock_net(s
), net
))
645 if (udp_sk(s
)->udp_port_hash
== num
&&
646 s
->sk_family
== PF_INET6
) {
647 struct ipv6_pinfo
*np
= inet6_sk(s
);
648 if (inet
->inet_dport
) {
649 if (inet
->inet_dport
!= rmt_port
)
652 if (!ipv6_addr_any(&np
->daddr
) &&
653 !ipv6_addr_equal(&np
->daddr
, rmt_addr
))
656 if (s
->sk_bound_dev_if
&& s
->sk_bound_dev_if
!= dif
)
659 if (!ipv6_addr_any(&np
->rcv_saddr
)) {
660 if (!ipv6_addr_equal(&np
->rcv_saddr
, loc_addr
))
663 if (!inet6_mc_check(s
, loc_addr
, rmt_addr
))
671 static void flush_stack(struct sock
**stack
, unsigned int count
,
672 struct sk_buff
*skb
, unsigned int final
)
674 struct sk_buff
*skb1
= NULL
;
678 for (i
= 0; i
< count
; i
++) {
680 if (likely(skb1
== NULL
))
681 skb1
= (i
== final
) ? skb
: skb_clone(skb
, GFP_ATOMIC
);
683 atomic_inc(&sk
->sk_drops
);
684 UDP6_INC_STATS_BH(sock_net(sk
), UDP_MIB_RCVBUFERRORS
,
686 UDP6_INC_STATS_BH(sock_net(sk
), UDP_MIB_INERRORS
,
690 if (skb1
&& udpv6_queue_rcv_skb(sk
, skb1
) <= 0)
697 * Note: called only from the BH handler context,
698 * so we don't need to lock the hashes.
700 static int __udp6_lib_mcast_deliver(struct net
*net
, struct sk_buff
*skb
,
701 const struct in6_addr
*saddr
, const struct in6_addr
*daddr
,
702 struct udp_table
*udptable
)
704 struct sock
*sk
, *stack
[256 / sizeof(struct sock
*)];
705 const struct udphdr
*uh
= udp_hdr(skb
);
706 struct udp_hslot
*hslot
= udp_hashslot(udptable
, net
, ntohs(uh
->dest
));
708 unsigned int i
, count
= 0;
710 spin_lock(&hslot
->lock
);
711 sk
= sk_nulls_head(&hslot
->head
);
712 dif
= inet6_iif(skb
);
713 sk
= udp_v6_mcast_next(net
, sk
, uh
->dest
, daddr
, uh
->source
, saddr
, dif
);
716 sk
= udp_v6_mcast_next(net
, sk_nulls_next(sk
), uh
->dest
, daddr
,
717 uh
->source
, saddr
, dif
);
718 if (unlikely(count
== ARRAY_SIZE(stack
))) {
721 flush_stack(stack
, count
, skb
, ~0);
726 * before releasing the lock, we must take reference on sockets
728 for (i
= 0; i
< count
; i
++)
731 spin_unlock(&hslot
->lock
);
734 flush_stack(stack
, count
, skb
, count
- 1);
736 for (i
= 0; i
< count
; i
++)
744 static inline int udp6_csum_init(struct sk_buff
*skb
, struct udphdr
*uh
,
749 UDP_SKB_CB(skb
)->partial_cov
= 0;
750 UDP_SKB_CB(skb
)->cscov
= skb
->len
;
752 if (proto
== IPPROTO_UDPLITE
) {
753 err
= udplite_checksum_init(skb
, uh
);
758 if (uh
->check
== 0) {
759 /* RFC 2460 section 8.1 says that we SHOULD log
760 this error. Well, it is reasonable.
762 LIMIT_NETDEBUG(KERN_INFO
"IPv6: udp checksum is 0\n");
765 if (skb
->ip_summed
== CHECKSUM_COMPLETE
&&
766 !csum_ipv6_magic(&ipv6_hdr(skb
)->saddr
, &ipv6_hdr(skb
)->daddr
,
767 skb
->len
, proto
, skb
->csum
))
768 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
770 if (!skb_csum_unnecessary(skb
))
771 skb
->csum
= ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb
)->saddr
,
772 &ipv6_hdr(skb
)->daddr
,
773 skb
->len
, proto
, 0));
778 int __udp6_lib_rcv(struct sk_buff
*skb
, struct udp_table
*udptable
,
781 struct net
*net
= dev_net(skb
->dev
);
784 const struct in6_addr
*saddr
, *daddr
;
787 if (!pskb_may_pull(skb
, sizeof(struct udphdr
)))
790 saddr
= &ipv6_hdr(skb
)->saddr
;
791 daddr
= &ipv6_hdr(skb
)->daddr
;
794 ulen
= ntohs(uh
->len
);
798 if (proto
== IPPROTO_UDP
) {
799 /* UDP validates ulen. */
801 /* Check for jumbo payload */
805 if (ulen
< sizeof(*uh
))
808 if (ulen
< skb
->len
) {
809 if (pskb_trim_rcsum(skb
, ulen
))
811 saddr
= &ipv6_hdr(skb
)->saddr
;
812 daddr
= &ipv6_hdr(skb
)->daddr
;
817 if (udp6_csum_init(skb
, uh
, proto
))
821 * Multicast receive code
823 if (ipv6_addr_is_multicast(daddr
))
824 return __udp6_lib_mcast_deliver(net
, skb
,
825 saddr
, daddr
, udptable
);
830 * check socket cache ... must talk to Alan about his plans
831 * for sock caches... i'll skip this for now.
833 sk
= __udp6_lib_lookup_skb(skb
, uh
->source
, uh
->dest
, udptable
);
835 int ret
= udpv6_queue_rcv_skb(sk
, skb
);
838 /* a return value > 0 means to resubmit the input, but
839 * it wants the return to be -protocol, or 0
847 if (!xfrm6_policy_check(NULL
, XFRM_POLICY_IN
, skb
))
850 if (udp_lib_checksum_complete(skb
))
853 UDP6_INC_STATS_BH(net
, UDP_MIB_NOPORTS
, proto
== IPPROTO_UDPLITE
);
854 icmpv6_send(skb
, ICMPV6_DEST_UNREACH
, ICMPV6_PORT_UNREACH
, 0);
860 LIMIT_NETDEBUG(KERN_DEBUG
"UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n",
861 proto
== IPPROTO_UDPLITE
? "-Lite" : "",
870 UDP6_INC_STATS_BH(net
, UDP_MIB_INERRORS
, proto
== IPPROTO_UDPLITE
);
875 static __inline__
int udpv6_rcv(struct sk_buff
*skb
)
877 return __udp6_lib_rcv(skb
, &udp_table
, IPPROTO_UDP
);
881 * Throw away all pending data and cancel the corking. Socket is locked.
883 static void udp_v6_flush_pending_frames(struct sock
*sk
)
885 struct udp_sock
*up
= udp_sk(sk
);
887 if (up
->pending
== AF_INET
)
888 udp_flush_pending_frames(sk
);
889 else if (up
->pending
) {
892 ip6_flush_pending_frames(sk
);
897 * udp6_hwcsum_outgoing - handle outgoing HW checksumming
898 * @sk: socket we are sending on
899 * @skb: sk_buff containing the filled-in UDP header
900 * (checksum field must be zeroed out)
902 static void udp6_hwcsum_outgoing(struct sock
*sk
, struct sk_buff
*skb
,
903 const struct in6_addr
*saddr
,
904 const struct in6_addr
*daddr
, int len
)
907 struct udphdr
*uh
= udp_hdr(skb
);
910 if (skb_queue_len(&sk
->sk_write_queue
) == 1) {
911 /* Only one fragment on the socket. */
912 skb
->csum_start
= skb_transport_header(skb
) - skb
->head
;
913 skb
->csum_offset
= offsetof(struct udphdr
, check
);
914 uh
->check
= ~csum_ipv6_magic(saddr
, daddr
, len
, IPPROTO_UDP
, 0);
917 * HW-checksum won't work as there are two or more
918 * fragments on the socket so that all csums of sk_buffs
921 offset
= skb_transport_offset(skb
);
922 skb
->csum
= skb_checksum(skb
, offset
, skb
->len
- offset
, 0);
924 skb
->ip_summed
= CHECKSUM_NONE
;
926 skb_queue_walk(&sk
->sk_write_queue
, skb
) {
927 csum
= csum_add(csum
, skb
->csum
);
930 uh
->check
= csum_ipv6_magic(saddr
, daddr
, len
, IPPROTO_UDP
,
933 uh
->check
= CSUM_MANGLED_0
;
941 static int udp_v6_push_pending_frames(struct sock
*sk
)
945 struct udp_sock
*up
= udp_sk(sk
);
946 struct inet_sock
*inet
= inet_sk(sk
);
947 struct flowi6
*fl6
= &inet
->cork
.fl
.u
.ip6
;
949 int is_udplite
= IS_UDPLITE(sk
);
952 /* Grab the skbuff where UDP header space exists. */
953 if ((skb
= skb_peek(&sk
->sk_write_queue
)) == NULL
)
957 * Create a UDP header
960 uh
->source
= fl6
->fl6_sport
;
961 uh
->dest
= fl6
->fl6_dport
;
962 uh
->len
= htons(up
->len
);
966 csum
= udplite_csum_outgoing(sk
, skb
);
967 else if (skb
->ip_summed
== CHECKSUM_PARTIAL
) { /* UDP hardware csum */
968 udp6_hwcsum_outgoing(sk
, skb
, &fl6
->saddr
, &fl6
->daddr
,
972 csum
= udp_csum_outgoing(sk
, skb
);
974 /* add protocol-dependent pseudo-header */
975 uh
->check
= csum_ipv6_magic(&fl6
->saddr
, &fl6
->daddr
,
976 up
->len
, fl6
->flowi6_proto
, csum
);
978 uh
->check
= CSUM_MANGLED_0
;
981 err
= ip6_push_pending_frames(sk
);
983 if (err
== -ENOBUFS
&& !inet6_sk(sk
)->recverr
) {
984 UDP6_INC_STATS_USER(sock_net(sk
),
985 UDP_MIB_SNDBUFERRORS
, is_udplite
);
989 UDP6_INC_STATS_USER(sock_net(sk
),
990 UDP_MIB_OUTDATAGRAMS
, is_udplite
);
997 int udpv6_sendmsg(struct kiocb
*iocb
, struct sock
*sk
,
998 struct msghdr
*msg
, size_t len
)
1000 struct ipv6_txoptions opt_space
;
1001 struct udp_sock
*up
= udp_sk(sk
);
1002 struct inet_sock
*inet
= inet_sk(sk
);
1003 struct ipv6_pinfo
*np
= inet6_sk(sk
);
1004 struct sockaddr_in6
*sin6
= (struct sockaddr_in6
*) msg
->msg_name
;
1005 struct in6_addr
*daddr
, *final_p
, final
;
1006 struct ipv6_txoptions
*opt
= NULL
;
1007 struct ip6_flowlabel
*flowlabel
= NULL
;
1009 struct dst_entry
*dst
;
1010 int addr_len
= msg
->msg_namelen
;
1015 int corkreq
= up
->corkflag
|| msg
->msg_flags
&MSG_MORE
;
1018 int is_udplite
= IS_UDPLITE(sk
);
1019 int (*getfrag
)(void *, char *, int, int, int, struct sk_buff
*);
1021 /* destination address check */
1023 if (addr_len
< offsetof(struct sockaddr
, sa_data
))
1026 switch (sin6
->sin6_family
) {
1028 if (addr_len
< SIN6_LEN_RFC2133
)
1030 daddr
= &sin6
->sin6_addr
;
1033 goto do_udp_sendmsg
;
1035 msg
->msg_name
= sin6
= NULL
;
1036 msg
->msg_namelen
= addr_len
= 0;
1042 } else if (!up
->pending
) {
1043 if (sk
->sk_state
!= TCP_ESTABLISHED
)
1044 return -EDESTADDRREQ
;
1050 if (ipv6_addr_v4mapped(daddr
)) {
1051 struct sockaddr_in sin
;
1052 sin
.sin_family
= AF_INET
;
1053 sin
.sin_port
= sin6
? sin6
->sin6_port
: inet
->inet_dport
;
1054 sin
.sin_addr
.s_addr
= daddr
->s6_addr32
[3];
1055 msg
->msg_name
= &sin
;
1056 msg
->msg_namelen
= sizeof(sin
);
1058 if (__ipv6_only_sock(sk
))
1059 return -ENETUNREACH
;
1060 return udp_sendmsg(iocb
, sk
, msg
, len
);
1064 if (up
->pending
== AF_INET
)
1065 return udp_sendmsg(iocb
, sk
, msg
, len
);
1067 /* Rough check on arithmetic overflow,
1068 better check is made in ip6_append_data().
1070 if (len
> INT_MAX
- sizeof(struct udphdr
))
1075 * There are pending frames.
1076 * The socket lock must be held while it's corked.
1079 if (likely(up
->pending
)) {
1080 if (unlikely(up
->pending
!= AF_INET6
)) {
1082 return -EAFNOSUPPORT
;
1085 goto do_append_data
;
1089 ulen
+= sizeof(struct udphdr
);
1091 memset(&fl6
, 0, sizeof(fl6
));
1094 if (sin6
->sin6_port
== 0)
1097 fl6
.fl6_dport
= sin6
->sin6_port
;
1098 daddr
= &sin6
->sin6_addr
;
1101 fl6
.flowlabel
= sin6
->sin6_flowinfo
&IPV6_FLOWINFO_MASK
;
1102 if (fl6
.flowlabel
&IPV6_FLOWLABEL_MASK
) {
1103 flowlabel
= fl6_sock_lookup(sk
, fl6
.flowlabel
);
1104 if (flowlabel
== NULL
)
1106 daddr
= &flowlabel
->dst
;
1111 * Otherwise it will be difficult to maintain
1114 if (sk
->sk_state
== TCP_ESTABLISHED
&&
1115 ipv6_addr_equal(daddr
, &np
->daddr
))
1118 if (addr_len
>= sizeof(struct sockaddr_in6
) &&
1119 sin6
->sin6_scope_id
&&
1120 ipv6_addr_type(daddr
)&IPV6_ADDR_LINKLOCAL
)
1121 fl6
.flowi6_oif
= sin6
->sin6_scope_id
;
1123 if (sk
->sk_state
!= TCP_ESTABLISHED
)
1124 return -EDESTADDRREQ
;
1126 fl6
.fl6_dport
= inet
->inet_dport
;
1128 fl6
.flowlabel
= np
->flow_label
;
1132 if (!fl6
.flowi6_oif
)
1133 fl6
.flowi6_oif
= sk
->sk_bound_dev_if
;
1135 if (!fl6
.flowi6_oif
)
1136 fl6
.flowi6_oif
= np
->sticky_pktinfo
.ipi6_ifindex
;
1138 fl6
.flowi6_mark
= sk
->sk_mark
;
1140 if (msg
->msg_controllen
) {
1142 memset(opt
, 0, sizeof(struct ipv6_txoptions
));
1143 opt
->tot_len
= sizeof(*opt
);
1145 err
= datagram_send_ctl(sock_net(sk
), sk
, msg
, &fl6
, opt
,
1146 &hlimit
, &tclass
, &dontfrag
);
1148 fl6_sock_release(flowlabel
);
1151 if ((fl6
.flowlabel
&IPV6_FLOWLABEL_MASK
) && !flowlabel
) {
1152 flowlabel
= fl6_sock_lookup(sk
, fl6
.flowlabel
);
1153 if (flowlabel
== NULL
)
1156 if (!(opt
->opt_nflen
|opt
->opt_flen
))
1163 opt
= fl6_merge_options(&opt_space
, flowlabel
, opt
);
1164 opt
= ipv6_fixup_options(&opt_space
, opt
);
1166 fl6
.flowi6_proto
= sk
->sk_protocol
;
1167 if (!ipv6_addr_any(daddr
))
1170 fl6
.daddr
.s6_addr
[15] = 0x1; /* :: means loopback (BSD'ism) */
1171 if (ipv6_addr_any(&fl6
.saddr
) && !ipv6_addr_any(&np
->saddr
))
1172 fl6
.saddr
= np
->saddr
;
1173 fl6
.fl6_sport
= inet
->inet_sport
;
1175 final_p
= fl6_update_dst(&fl6
, opt
, &final
);
1179 if (!fl6
.flowi6_oif
&& ipv6_addr_is_multicast(&fl6
.daddr
)) {
1180 fl6
.flowi6_oif
= np
->mcast_oif
;
1182 } else if (!fl6
.flowi6_oif
)
1183 fl6
.flowi6_oif
= np
->ucast_oif
;
1185 security_sk_classify_flow(sk
, flowi6_to_flowi(&fl6
));
1187 dst
= ip6_sk_dst_lookup_flow(sk
, &fl6
, final_p
, true);
1195 if (ipv6_addr_is_multicast(&fl6
.daddr
))
1196 hlimit
= np
->mcast_hops
;
1198 hlimit
= np
->hop_limit
;
1200 hlimit
= ip6_dst_hoplimit(dst
);
1204 tclass
= np
->tclass
;
1207 dontfrag
= np
->dontfrag
;
1209 if (msg
->msg_flags
&MSG_CONFIRM
)
1214 if (unlikely(up
->pending
)) {
1215 /* The socket is already corked while preparing it. */
1216 /* ... which is an evident application bug. --ANK */
1219 LIMIT_NETDEBUG(KERN_DEBUG
"udp cork app bug 2\n");
1224 up
->pending
= AF_INET6
;
1228 getfrag
= is_udplite
? udplite_getfrag
: ip_generic_getfrag
;
1229 err
= ip6_append_data(sk
, getfrag
, msg
->msg_iov
, ulen
,
1230 sizeof(struct udphdr
), hlimit
, tclass
, opt
, &fl6
,
1231 (struct rt6_info
*)dst
,
1232 corkreq
? msg
->msg_flags
|MSG_MORE
: msg
->msg_flags
, dontfrag
);
1234 udp_v6_flush_pending_frames(sk
);
1236 err
= udp_v6_push_pending_frames(sk
);
1237 else if (unlikely(skb_queue_empty(&sk
->sk_write_queue
)))
1242 ip6_dst_store(sk
, dst
,
1243 ipv6_addr_equal(&fl6
.daddr
, &np
->daddr
) ?
1245 #ifdef CONFIG_IPV6_SUBTREES
1246 ipv6_addr_equal(&fl6
.saddr
, &np
->saddr
) ?
1257 err
= np
->recverr
? net_xmit_errno(err
) : 0;
1261 fl6_sock_release(flowlabel
);
1265 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
1266 * ENOBUFS might not be good (it's not tunable per se), but otherwise
1267 * we don't have a good statistic (IpOutDiscards but it can be too many
1268 * things). We could add another new stat but at least for now that
1269 * seems like overkill.
1271 if (err
== -ENOBUFS
|| test_bit(SOCK_NOSPACE
, &sk
->sk_socket
->flags
)) {
1272 UDP6_INC_STATS_USER(sock_net(sk
),
1273 UDP_MIB_SNDBUFERRORS
, is_udplite
);
1279 if (!(msg
->msg_flags
&MSG_PROBE
) || len
)
1280 goto back_from_confirm
;
1285 void udpv6_destroy_sock(struct sock
*sk
)
1288 udp_v6_flush_pending_frames(sk
);
1291 inet6_destroy_sock(sk
);
1295 * Socket option code for UDP
1297 int udpv6_setsockopt(struct sock
*sk
, int level
, int optname
,
1298 char __user
*optval
, unsigned int optlen
)
1300 if (level
== SOL_UDP
|| level
== SOL_UDPLITE
)
1301 return udp_lib_setsockopt(sk
, level
, optname
, optval
, optlen
,
1302 udp_v6_push_pending_frames
);
1303 return ipv6_setsockopt(sk
, level
, optname
, optval
, optlen
);
1306 #ifdef CONFIG_COMPAT
1307 int compat_udpv6_setsockopt(struct sock
*sk
, int level
, int optname
,
1308 char __user
*optval
, unsigned int optlen
)
1310 if (level
== SOL_UDP
|| level
== SOL_UDPLITE
)
1311 return udp_lib_setsockopt(sk
, level
, optname
, optval
, optlen
,
1312 udp_v6_push_pending_frames
);
1313 return compat_ipv6_setsockopt(sk
, level
, optname
, optval
, optlen
);
1317 int udpv6_getsockopt(struct sock
*sk
, int level
, int optname
,
1318 char __user
*optval
, int __user
*optlen
)
1320 if (level
== SOL_UDP
|| level
== SOL_UDPLITE
)
1321 return udp_lib_getsockopt(sk
, level
, optname
, optval
, optlen
);
1322 return ipv6_getsockopt(sk
, level
, optname
, optval
, optlen
);
1325 #ifdef CONFIG_COMPAT
1326 int compat_udpv6_getsockopt(struct sock
*sk
, int level
, int optname
,
1327 char __user
*optval
, int __user
*optlen
)
1329 if (level
== SOL_UDP
|| level
== SOL_UDPLITE
)
1330 return udp_lib_getsockopt(sk
, level
, optname
, optval
, optlen
);
1331 return compat_ipv6_getsockopt(sk
, level
, optname
, optval
, optlen
);
1335 static int udp6_ufo_send_check(struct sk_buff
*skb
)
1337 const struct ipv6hdr
*ipv6h
;
1340 if (!pskb_may_pull(skb
, sizeof(*uh
)))
1343 ipv6h
= ipv6_hdr(skb
);
1346 uh
->check
= ~csum_ipv6_magic(&ipv6h
->saddr
, &ipv6h
->daddr
, skb
->len
,
1348 skb
->csum_start
= skb_transport_header(skb
) - skb
->head
;
1349 skb
->csum_offset
= offsetof(struct udphdr
, check
);
1350 skb
->ip_summed
= CHECKSUM_PARTIAL
;
1354 static struct sk_buff
*udp6_ufo_fragment(struct sk_buff
*skb
,
1355 netdev_features_t features
)
1357 struct sk_buff
*segs
= ERR_PTR(-EINVAL
);
1359 unsigned int unfrag_ip6hlen
, unfrag_len
;
1360 struct frag_hdr
*fptr
;
1361 u8
*mac_start
, *prevhdr
;
1363 u8 frag_hdr_sz
= sizeof(struct frag_hdr
);
1367 mss
= skb_shinfo(skb
)->gso_size
;
1368 if (unlikely(skb
->len
<= mss
))
1371 if (skb_gso_ok(skb
, features
| NETIF_F_GSO_ROBUST
)) {
1372 /* Packet is from an untrusted source, reset gso_segs. */
1373 int type
= skb_shinfo(skb
)->gso_type
;
1375 if (unlikely(type
& ~(SKB_GSO_UDP
| SKB_GSO_DODGY
) ||
1376 !(type
& (SKB_GSO_UDP
))))
1379 skb_shinfo(skb
)->gso_segs
= DIV_ROUND_UP(skb
->len
, mss
);
1385 /* Do software UFO. Complete and fill in the UDP checksum as HW cannot
1386 * do checksum of UDP packets sent as multiple IP fragments.
1388 offset
= skb_checksum_start_offset(skb
);
1389 csum
= skb_checksum(skb
, offset
, skb
->len
- offset
, 0);
1390 offset
+= skb
->csum_offset
;
1391 *(__sum16
*)(skb
->data
+ offset
) = csum_fold(csum
);
1392 skb
->ip_summed
= CHECKSUM_NONE
;
1394 /* Check if there is enough headroom to insert fragment header. */
1395 if ((skb_mac_header(skb
) < skb
->head
+ frag_hdr_sz
) &&
1396 pskb_expand_head(skb
, frag_hdr_sz
, 0, GFP_ATOMIC
))
1399 /* Find the unfragmentable header and shift it left by frag_hdr_sz
1400 * bytes to insert fragment header.
1402 unfrag_ip6hlen
= ip6_find_1stfragopt(skb
, &prevhdr
);
1404 *prevhdr
= NEXTHDR_FRAGMENT
;
1405 unfrag_len
= skb_network_header(skb
) - skb_mac_header(skb
) +
1407 mac_start
= skb_mac_header(skb
);
1408 memmove(mac_start
-frag_hdr_sz
, mac_start
, unfrag_len
);
1410 skb
->mac_header
-= frag_hdr_sz
;
1411 skb
->network_header
-= frag_hdr_sz
;
1413 fptr
= (struct frag_hdr
*)(skb_network_header(skb
) + unfrag_ip6hlen
);
1414 fptr
->nexthdr
= nexthdr
;
1416 ipv6_select_ident(fptr
, (struct rt6_info
*)skb_dst(skb
));
1418 /* Fragment the skb. ipv6 header and the remaining fields of the
1419 * fragment header are updated in ipv6_gso_segment()
1421 segs
= skb_segment(skb
, features
);
1427 static const struct inet6_protocol udpv6_protocol
= {
1428 .handler
= udpv6_rcv
,
1429 .err_handler
= udpv6_err
,
1430 .gso_send_check
= udp6_ufo_send_check
,
1431 .gso_segment
= udp6_ufo_fragment
,
1432 .flags
= INET6_PROTO_NOPOLICY
|INET6_PROTO_FINAL
,
1435 /* ------------------------------------------------------------------------ */
1436 #ifdef CONFIG_PROC_FS
1438 static void udp6_sock_seq_show(struct seq_file
*seq
, struct sock
*sp
, int bucket
)
1440 struct inet_sock
*inet
= inet_sk(sp
);
1441 struct ipv6_pinfo
*np
= inet6_sk(sp
);
1442 const struct in6_addr
*dest
, *src
;
1446 src
= &np
->rcv_saddr
;
1447 destp
= ntohs(inet
->inet_dport
);
1448 srcp
= ntohs(inet
->inet_sport
);
1450 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1451 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %d\n",
1453 src
->s6_addr32
[0], src
->s6_addr32
[1],
1454 src
->s6_addr32
[2], src
->s6_addr32
[3], srcp
,
1455 dest
->s6_addr32
[0], dest
->s6_addr32
[1],
1456 dest
->s6_addr32
[2], dest
->s6_addr32
[3], destp
,
1458 sk_wmem_alloc_get(sp
),
1459 sk_rmem_alloc_get(sp
),
1463 atomic_read(&sp
->sk_refcnt
), sp
,
1464 atomic_read(&sp
->sk_drops
));
1467 int udp6_seq_show(struct seq_file
*seq
, void *v
)
1469 if (v
== SEQ_START_TOKEN
)
1474 "st tx_queue rx_queue tr tm->when retrnsmt"
1475 " uid timeout inode ref pointer drops\n");
1477 udp6_sock_seq_show(seq
, v
, ((struct udp_iter_state
*)seq
->private)->bucket
);
1481 static const struct file_operations udp6_afinfo_seq_fops
= {
1482 .owner
= THIS_MODULE
,
1483 .open
= udp_seq_open
,
1485 .llseek
= seq_lseek
,
1486 .release
= seq_release_net
1489 static struct udp_seq_afinfo udp6_seq_afinfo
= {
1492 .udp_table
= &udp_table
,
1493 .seq_fops
= &udp6_afinfo_seq_fops
,
1495 .show
= udp6_seq_show
,
1499 int __net_init
udp6_proc_init(struct net
*net
)
1501 return udp_proc_register(net
, &udp6_seq_afinfo
);
1504 void udp6_proc_exit(struct net
*net
) {
1505 udp_proc_unregister(net
, &udp6_seq_afinfo
);
1507 #endif /* CONFIG_PROC_FS */
1509 /* ------------------------------------------------------------------------ */
1511 struct proto udpv6_prot
= {
1513 .owner
= THIS_MODULE
,
1514 .close
= udp_lib_close
,
1515 .connect
= ip6_datagram_connect
,
1516 .disconnect
= udp_disconnect
,
1518 .destroy
= udpv6_destroy_sock
,
1519 .setsockopt
= udpv6_setsockopt
,
1520 .getsockopt
= udpv6_getsockopt
,
1521 .sendmsg
= udpv6_sendmsg
,
1522 .recvmsg
= udpv6_recvmsg
,
1523 .backlog_rcv
= __udpv6_queue_rcv_skb
,
1524 .hash
= udp_lib_hash
,
1525 .unhash
= udp_lib_unhash
,
1526 .rehash
= udp_v6_rehash
,
1527 .get_port
= udp_v6_get_port
,
1528 .memory_allocated
= &udp_memory_allocated
,
1529 .sysctl_mem
= sysctl_udp_mem
,
1530 .sysctl_wmem
= &sysctl_udp_wmem_min
,
1531 .sysctl_rmem
= &sysctl_udp_rmem_min
,
1532 .obj_size
= sizeof(struct udp6_sock
),
1533 .slab_flags
= SLAB_DESTROY_BY_RCU
,
1534 .h
.udp_table
= &udp_table
,
1535 #ifdef CONFIG_COMPAT
1536 .compat_setsockopt
= compat_udpv6_setsockopt
,
1537 .compat_getsockopt
= compat_udpv6_getsockopt
,
1539 .clear_sk
= sk_prot_clear_portaddr_nulls
,
1542 static struct inet_protosw udpv6_protosw
= {
1544 .protocol
= IPPROTO_UDP
,
1545 .prot
= &udpv6_prot
,
1546 .ops
= &inet6_dgram_ops
,
1547 .no_check
= UDP_CSUM_DEFAULT
,
1548 .flags
= INET_PROTOSW_PERMANENT
,
1552 int __init
udpv6_init(void)
1556 ret
= inet6_add_protocol(&udpv6_protocol
, IPPROTO_UDP
);
1560 ret
= inet6_register_protosw(&udpv6_protosw
);
1562 goto out_udpv6_protocol
;
1567 inet6_del_protocol(&udpv6_protocol
, IPPROTO_UDP
);
1571 void udpv6_exit(void)
1573 inet6_unregister_protosw(&udpv6_protosw
);
1574 inet6_del_protocol(&udpv6_protocol
, IPPROTO_UDP
);