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>
50 #include <linux/proc_fs.h>
51 #include <linux/seq_file.h>
52 #include <trace/events/skb.h>
55 int ipv6_rcv_saddr_equal(const struct sock
*sk
, const struct sock
*sk2
)
57 const struct in6_addr
*sk_rcv_saddr6
= &inet6_sk(sk
)->rcv_saddr
;
58 const struct in6_addr
*sk2_rcv_saddr6
= inet6_rcv_saddr(sk2
);
59 __be32 sk1_rcv_saddr
= sk_rcv_saddr(sk
);
60 __be32 sk2_rcv_saddr
= sk_rcv_saddr(sk2
);
61 int sk_ipv6only
= ipv6_only_sock(sk
);
62 int sk2_ipv6only
= inet_v6_ipv6only(sk2
);
63 int addr_type
= ipv6_addr_type(sk_rcv_saddr6
);
64 int addr_type2
= sk2_rcv_saddr6
? ipv6_addr_type(sk2_rcv_saddr6
) : IPV6_ADDR_MAPPED
;
66 /* if both are mapped, treat as IPv4 */
67 if (addr_type
== IPV6_ADDR_MAPPED
&& addr_type2
== IPV6_ADDR_MAPPED
)
68 return (!sk2_ipv6only
&&
69 (!sk1_rcv_saddr
|| !sk2_rcv_saddr
||
70 sk1_rcv_saddr
== sk2_rcv_saddr
));
72 if (addr_type2
== IPV6_ADDR_ANY
&&
73 !(sk2_ipv6only
&& addr_type
== IPV6_ADDR_MAPPED
))
76 if (addr_type
== IPV6_ADDR_ANY
&&
77 !(sk_ipv6only
&& addr_type2
== IPV6_ADDR_MAPPED
))
81 ipv6_addr_equal(sk_rcv_saddr6
, sk2_rcv_saddr6
))
87 static unsigned int udp6_portaddr_hash(struct net
*net
,
88 const struct in6_addr
*addr6
,
91 unsigned int hash
, mix
= net_hash_mix(net
);
93 if (ipv6_addr_any(addr6
))
94 hash
= jhash_1word(0, mix
);
95 else if (ipv6_addr_v4mapped(addr6
))
96 hash
= jhash_1word((__force u32
)addr6
->s6_addr32
[3], mix
);
98 hash
= jhash2((__force u32
*)addr6
->s6_addr32
, 4, mix
);
104 int udp_v6_get_port(struct sock
*sk
, unsigned short snum
)
106 unsigned int hash2_nulladdr
=
107 udp6_portaddr_hash(sock_net(sk
), &in6addr_any
, snum
);
108 unsigned int hash2_partial
=
109 udp6_portaddr_hash(sock_net(sk
), &inet6_sk(sk
)->rcv_saddr
, 0);
111 /* precompute partial secondary hash */
112 udp_sk(sk
)->udp_portaddr_hash
= hash2_partial
;
113 return udp_lib_get_port(sk
, snum
, ipv6_rcv_saddr_equal
, hash2_nulladdr
);
116 static void udp_v6_rehash(struct sock
*sk
)
118 u16 new_hash
= udp6_portaddr_hash(sock_net(sk
),
119 &inet6_sk(sk
)->rcv_saddr
,
120 inet_sk(sk
)->inet_num
);
122 udp_lib_rehash(sk
, new_hash
);
125 static inline int compute_score(struct sock
*sk
, struct net
*net
,
127 const struct in6_addr
*saddr
, __be16 sport
,
128 const struct in6_addr
*daddr
, __be16 dport
,
133 if (net_eq(sock_net(sk
), net
) && udp_sk(sk
)->udp_port_hash
== hnum
&&
134 sk
->sk_family
== PF_INET6
) {
135 struct ipv6_pinfo
*np
= inet6_sk(sk
);
136 struct inet_sock
*inet
= inet_sk(sk
);
139 if (inet
->inet_dport
) {
140 if (inet
->inet_dport
!= sport
)
144 if (!ipv6_addr_any(&np
->rcv_saddr
)) {
145 if (!ipv6_addr_equal(&np
->rcv_saddr
, daddr
))
149 if (!ipv6_addr_any(&np
->daddr
)) {
150 if (!ipv6_addr_equal(&np
->daddr
, saddr
))
154 if (sk
->sk_bound_dev_if
) {
155 if (sk
->sk_bound_dev_if
!= dif
)
163 #define SCORE2_MAX (1 + 1 + 1)
164 static inline int compute_score2(struct sock
*sk
, struct net
*net
,
165 const struct in6_addr
*saddr
, __be16 sport
,
166 const struct in6_addr
*daddr
, unsigned short hnum
,
171 if (net_eq(sock_net(sk
), net
) && udp_sk(sk
)->udp_port_hash
== hnum
&&
172 sk
->sk_family
== PF_INET6
) {
173 struct ipv6_pinfo
*np
= inet6_sk(sk
);
174 struct inet_sock
*inet
= inet_sk(sk
);
176 if (!ipv6_addr_equal(&np
->rcv_saddr
, daddr
))
179 if (inet
->inet_dport
) {
180 if (inet
->inet_dport
!= sport
)
184 if (!ipv6_addr_any(&np
->daddr
)) {
185 if (!ipv6_addr_equal(&np
->daddr
, saddr
))
189 if (sk
->sk_bound_dev_if
) {
190 if (sk
->sk_bound_dev_if
!= dif
)
199 /* called with read_rcu_lock() */
200 static struct sock
*udp6_lib_lookup2(struct net
*net
,
201 const struct in6_addr
*saddr
, __be16 sport
,
202 const struct in6_addr
*daddr
, unsigned int hnum
, int dif
,
203 struct udp_hslot
*hslot2
, unsigned int slot2
)
205 struct sock
*sk
, *result
;
206 struct hlist_nulls_node
*node
;
207 int score
, badness
, matches
= 0, reuseport
= 0;
213 udp_portaddr_for_each_entry_rcu(sk
, node
, &hslot2
->head
) {
214 score
= compute_score2(sk
, net
, saddr
, sport
,
216 if (score
> badness
) {
219 reuseport
= sk
->sk_reuseport
;
221 hash
= inet6_ehashfn(net
, daddr
, hnum
,
224 } else if (score
== SCORE2_MAX
)
226 } else if (score
== badness
&& reuseport
) {
228 if (((u64
)hash
* matches
) >> 32 == 0)
230 hash
= next_pseudo_random32(hash
);
234 * if the nulls value we got at the end of this lookup is
235 * not the expected one, we must restart lookup.
236 * We probably met an item that was moved to another chain.
238 if (get_nulls_value(node
) != slot2
)
243 if (unlikely(!atomic_inc_not_zero_hint(&result
->sk_refcnt
, 2)))
245 else if (unlikely(compute_score2(result
, net
, saddr
, sport
,
246 daddr
, hnum
, dif
) < badness
)) {
254 struct sock
*__udp6_lib_lookup(struct net
*net
,
255 const struct in6_addr
*saddr
, __be16 sport
,
256 const struct in6_addr
*daddr
, __be16 dport
,
257 int dif
, struct udp_table
*udptable
)
259 struct sock
*sk
, *result
;
260 struct hlist_nulls_node
*node
;
261 unsigned short hnum
= ntohs(dport
);
262 unsigned int hash2
, slot2
, slot
= udp_hashfn(net
, hnum
, udptable
->mask
);
263 struct udp_hslot
*hslot2
, *hslot
= &udptable
->hash
[slot
];
264 int score
, badness
, matches
= 0, reuseport
= 0;
268 if (hslot
->count
> 10) {
269 hash2
= udp6_portaddr_hash(net
, daddr
, hnum
);
270 slot2
= hash2
& udptable
->mask
;
271 hslot2
= &udptable
->hash2
[slot2
];
272 if (hslot
->count
< hslot2
->count
)
275 result
= udp6_lib_lookup2(net
, saddr
, sport
,
279 hash2
= udp6_portaddr_hash(net
, &in6addr_any
, hnum
);
280 slot2
= hash2
& udptable
->mask
;
281 hslot2
= &udptable
->hash2
[slot2
];
282 if (hslot
->count
< hslot2
->count
)
285 result
= udp6_lib_lookup2(net
, saddr
, sport
,
286 &in6addr_any
, hnum
, dif
,
295 sk_nulls_for_each_rcu(sk
, node
, &hslot
->head
) {
296 score
= compute_score(sk
, net
, hnum
, saddr
, sport
, daddr
, dport
, dif
);
297 if (score
> badness
) {
300 reuseport
= sk
->sk_reuseport
;
302 hash
= inet6_ehashfn(net
, daddr
, hnum
,
306 } else if (score
== badness
&& reuseport
) {
308 if (((u64
)hash
* matches
) >> 32 == 0)
310 hash
= next_pseudo_random32(hash
);
314 * if the nulls value we got at the end of this lookup is
315 * not the expected one, we must restart lookup.
316 * We probably met an item that was moved to another chain.
318 if (get_nulls_value(node
) != slot
)
322 if (unlikely(!atomic_inc_not_zero_hint(&result
->sk_refcnt
, 2)))
324 else if (unlikely(compute_score(result
, net
, hnum
, saddr
, sport
,
325 daddr
, dport
, dif
) < badness
)) {
333 EXPORT_SYMBOL_GPL(__udp6_lib_lookup
);
335 static struct sock
*__udp6_lib_lookup_skb(struct sk_buff
*skb
,
336 __be16 sport
, __be16 dport
,
337 struct udp_table
*udptable
)
340 const struct ipv6hdr
*iph
= ipv6_hdr(skb
);
342 if (unlikely(sk
= skb_steal_sock(skb
)))
344 return __udp6_lib_lookup(dev_net(skb_dst(skb
)->dev
), &iph
->saddr
, sport
,
345 &iph
->daddr
, dport
, inet6_iif(skb
),
349 struct sock
*udp6_lib_lookup(struct net
*net
, const struct in6_addr
*saddr
, __be16 sport
,
350 const struct in6_addr
*daddr
, __be16 dport
, int dif
)
352 return __udp6_lib_lookup(net
, saddr
, sport
, daddr
, dport
, dif
, &udp_table
);
354 EXPORT_SYMBOL_GPL(udp6_lib_lookup
);
358 * This should be easy, if there is something there we
359 * return it, otherwise we block.
362 int udpv6_recvmsg(struct kiocb
*iocb
, struct sock
*sk
,
363 struct msghdr
*msg
, size_t len
,
364 int noblock
, int flags
, int *addr_len
)
366 struct ipv6_pinfo
*np
= inet6_sk(sk
);
367 struct inet_sock
*inet
= inet_sk(sk
);
369 unsigned int ulen
, copied
;
372 int is_udplite
= IS_UDPLITE(sk
);
377 *addr_len
= sizeof(struct sockaddr_in6
);
379 if (flags
& MSG_ERRQUEUE
)
380 return ipv6_recv_error(sk
, msg
, len
);
382 if (np
->rxpmtu
&& np
->rxopt
.bits
.rxpmtu
)
383 return ipv6_recv_rxpmtu(sk
, msg
, len
);
386 skb
= __skb_recv_datagram(sk
, flags
| (noblock
? MSG_DONTWAIT
: 0),
387 &peeked
, &off
, &err
);
391 ulen
= skb
->len
- sizeof(struct udphdr
);
395 else if (copied
< ulen
)
396 msg
->msg_flags
|= MSG_TRUNC
;
398 is_udp4
= (skb
->protocol
== htons(ETH_P_IP
));
401 * If checksum is needed at all, try to do it while copying the
402 * data. If the data is truncated, or if we only want a partial
403 * coverage checksum (UDP-Lite), do it before the copy.
406 if (copied
< ulen
|| UDP_SKB_CB(skb
)->partial_cov
) {
407 if (udp_lib_checksum_complete(skb
))
411 if (skb_csum_unnecessary(skb
))
412 err
= skb_copy_datagram_iovec(skb
, sizeof(struct udphdr
),
413 msg
->msg_iov
, copied
);
415 err
= skb_copy_and_csum_datagram_iovec(skb
, sizeof(struct udphdr
), msg
->msg_iov
);
420 trace_kfree_skb(skb
, udpv6_recvmsg
);
422 atomic_inc(&sk
->sk_drops
);
424 UDP_INC_STATS_USER(sock_net(sk
),
428 UDP6_INC_STATS_USER(sock_net(sk
),
436 UDP_INC_STATS_USER(sock_net(sk
),
437 UDP_MIB_INDATAGRAMS
, is_udplite
);
439 UDP6_INC_STATS_USER(sock_net(sk
),
440 UDP_MIB_INDATAGRAMS
, is_udplite
);
443 sock_recv_ts_and_drops(msg
, sk
, skb
);
445 /* Copy the address. */
447 struct sockaddr_in6
*sin6
;
449 sin6
= (struct sockaddr_in6
*) msg
->msg_name
;
450 sin6
->sin6_family
= AF_INET6
;
451 sin6
->sin6_port
= udp_hdr(skb
)->source
;
452 sin6
->sin6_flowinfo
= 0;
453 sin6
->sin6_scope_id
= 0;
456 ipv6_addr_set_v4mapped(ip_hdr(skb
)->saddr
,
459 sin6
->sin6_addr
= ipv6_hdr(skb
)->saddr
;
460 if (ipv6_addr_type(&sin6
->sin6_addr
) & IPV6_ADDR_LINKLOCAL
)
461 sin6
->sin6_scope_id
= IP6CB(skb
)->iif
;
466 if (inet
->cmsg_flags
)
467 ip_cmsg_recv(msg
, skb
);
470 ip6_datagram_recv_ctl(sk
, msg
, skb
);
474 if (flags
& MSG_TRUNC
)
478 skb_free_datagram_locked(sk
, skb
);
483 slow
= lock_sock_fast(sk
);
484 if (!skb_kill_datagram(sk
, skb
, flags
)) {
486 UDP_INC_STATS_USER(sock_net(sk
),
487 UDP_MIB_INERRORS
, is_udplite
);
489 UDP6_INC_STATS_USER(sock_net(sk
),
490 UDP_MIB_INERRORS
, is_udplite
);
492 unlock_sock_fast(sk
, slow
);
497 /* starting over for a new packet */
498 msg
->msg_flags
&= ~MSG_TRUNC
;
502 void __udp6_lib_err(struct sk_buff
*skb
, struct inet6_skb_parm
*opt
,
503 u8 type
, u8 code
, int offset
, __be32 info
,
504 struct udp_table
*udptable
)
506 struct ipv6_pinfo
*np
;
507 const struct ipv6hdr
*hdr
= (const struct ipv6hdr
*)skb
->data
;
508 const struct in6_addr
*saddr
= &hdr
->saddr
;
509 const struct in6_addr
*daddr
= &hdr
->daddr
;
510 struct udphdr
*uh
= (struct udphdr
*)(skb
->data
+offset
);
514 sk
= __udp6_lib_lookup(dev_net(skb
->dev
), daddr
, uh
->dest
,
515 saddr
, uh
->source
, inet6_iif(skb
), udptable
);
519 if (type
== ICMPV6_PKT_TOOBIG
)
520 ip6_sk_update_pmtu(skb
, sk
, info
);
521 if (type
== NDISC_REDIRECT
)
522 ip6_sk_redirect(skb
, sk
);
526 if (!icmpv6_err_convert(type
, code
, &err
) && !np
->recverr
)
529 if (sk
->sk_state
!= TCP_ESTABLISHED
&& !np
->recverr
)
533 ipv6_icmp_error(sk
, skb
, err
, uh
->dest
, ntohl(info
), (u8
*)(uh
+1));
536 sk
->sk_error_report(sk
);
541 static int __udpv6_queue_rcv_skb(struct sock
*sk
, struct sk_buff
*skb
)
545 if (!ipv6_addr_any(&inet6_sk(sk
)->daddr
))
546 sock_rps_save_rxhash(sk
, skb
);
548 rc
= sock_queue_rcv_skb(sk
, skb
);
550 int is_udplite
= IS_UDPLITE(sk
);
552 /* Note that an ENOMEM error is charged twice */
554 UDP6_INC_STATS_BH(sock_net(sk
),
555 UDP_MIB_RCVBUFERRORS
, is_udplite
);
556 UDP6_INC_STATS_BH(sock_net(sk
), UDP_MIB_INERRORS
, is_udplite
);
563 static __inline__
void udpv6_err(struct sk_buff
*skb
,
564 struct inet6_skb_parm
*opt
, u8 type
,
565 u8 code
, int offset
, __be32 info
)
567 __udp6_lib_err(skb
, opt
, type
, code
, offset
, info
, &udp_table
);
570 static struct static_key udpv6_encap_needed __read_mostly
;
571 void udpv6_encap_enable(void)
573 if (!static_key_enabled(&udpv6_encap_needed
))
574 static_key_slow_inc(&udpv6_encap_needed
);
576 EXPORT_SYMBOL(udpv6_encap_enable
);
578 int udpv6_queue_rcv_skb(struct sock
*sk
, struct sk_buff
*skb
)
580 struct udp_sock
*up
= udp_sk(sk
);
582 int is_udplite
= IS_UDPLITE(sk
);
584 if (!xfrm6_policy_check(sk
, XFRM_POLICY_IN
, skb
))
587 if (static_key_false(&udpv6_encap_needed
) && up
->encap_type
) {
588 int (*encap_rcv
)(struct sock
*sk
, struct sk_buff
*skb
);
591 * This is an encapsulation socket so pass the skb to
592 * the socket's udp_encap_rcv() hook. Otherwise, just
593 * fall through and pass this up the UDP socket.
594 * up->encap_rcv() returns the following value:
595 * =0 if skb was successfully passed to the encap
596 * handler or was discarded by it.
597 * >0 if skb should be passed on to UDP.
598 * <0 if skb should be resubmitted as proto -N
601 /* if we're overly short, let UDP handle it */
602 encap_rcv
= ACCESS_ONCE(up
->encap_rcv
);
603 if (skb
->len
> sizeof(struct udphdr
) && encap_rcv
!= NULL
) {
606 ret
= encap_rcv(sk
, skb
);
608 UDP_INC_STATS_BH(sock_net(sk
),
615 /* FALLTHROUGH -- it's a UDP Packet */
619 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
621 if ((is_udplite
& UDPLITE_RECV_CC
) && UDP_SKB_CB(skb
)->partial_cov
) {
623 if (up
->pcrlen
== 0) { /* full coverage was set */
624 LIMIT_NETDEBUG(KERN_WARNING
"UDPLITE6: partial coverage"
625 " %d while full coverage %d requested\n",
626 UDP_SKB_CB(skb
)->cscov
, skb
->len
);
629 if (UDP_SKB_CB(skb
)->cscov
< up
->pcrlen
) {
630 LIMIT_NETDEBUG(KERN_WARNING
"UDPLITE6: coverage %d "
631 "too small, need min %d\n",
632 UDP_SKB_CB(skb
)->cscov
, up
->pcrlen
);
637 if (rcu_access_pointer(sk
->sk_filter
)) {
638 if (udp_lib_checksum_complete(skb
))
642 if (sk_rcvqueues_full(sk
, skb
, sk
->sk_rcvbuf
))
649 if (!sock_owned_by_user(sk
))
650 rc
= __udpv6_queue_rcv_skb(sk
, skb
);
651 else if (sk_add_backlog(sk
, skb
, sk
->sk_rcvbuf
)) {
659 UDP6_INC_STATS_BH(sock_net(sk
), UDP_MIB_INERRORS
, is_udplite
);
660 atomic_inc(&sk
->sk_drops
);
665 static struct sock
*udp_v6_mcast_next(struct net
*net
, struct sock
*sk
,
666 __be16 loc_port
, const struct in6_addr
*loc_addr
,
667 __be16 rmt_port
, const struct in6_addr
*rmt_addr
,
670 struct hlist_nulls_node
*node
;
672 unsigned short num
= ntohs(loc_port
);
674 sk_nulls_for_each_from(s
, node
) {
675 struct inet_sock
*inet
= inet_sk(s
);
677 if (!net_eq(sock_net(s
), net
))
680 if (udp_sk(s
)->udp_port_hash
== num
&&
681 s
->sk_family
== PF_INET6
) {
682 struct ipv6_pinfo
*np
= inet6_sk(s
);
683 if (inet
->inet_dport
) {
684 if (inet
->inet_dport
!= rmt_port
)
687 if (!ipv6_addr_any(&np
->daddr
) &&
688 !ipv6_addr_equal(&np
->daddr
, rmt_addr
))
691 if (s
->sk_bound_dev_if
&& s
->sk_bound_dev_if
!= dif
)
694 if (!ipv6_addr_any(&np
->rcv_saddr
)) {
695 if (!ipv6_addr_equal(&np
->rcv_saddr
, loc_addr
))
698 if (!inet6_mc_check(s
, loc_addr
, rmt_addr
))
706 static void flush_stack(struct sock
**stack
, unsigned int count
,
707 struct sk_buff
*skb
, unsigned int final
)
709 struct sk_buff
*skb1
= NULL
;
713 for (i
= 0; i
< count
; i
++) {
715 if (likely(skb1
== NULL
))
716 skb1
= (i
== final
) ? skb
: skb_clone(skb
, GFP_ATOMIC
);
718 atomic_inc(&sk
->sk_drops
);
719 UDP6_INC_STATS_BH(sock_net(sk
), UDP_MIB_RCVBUFERRORS
,
721 UDP6_INC_STATS_BH(sock_net(sk
), UDP_MIB_INERRORS
,
725 if (skb1
&& udpv6_queue_rcv_skb(sk
, skb1
) <= 0)
732 * Note: called only from the BH handler context,
733 * so we don't need to lock the hashes.
735 static int __udp6_lib_mcast_deliver(struct net
*net
, struct sk_buff
*skb
,
736 const struct in6_addr
*saddr
, const struct in6_addr
*daddr
,
737 struct udp_table
*udptable
)
739 struct sock
*sk
, *stack
[256 / sizeof(struct sock
*)];
740 const struct udphdr
*uh
= udp_hdr(skb
);
741 struct udp_hslot
*hslot
= udp_hashslot(udptable
, net
, ntohs(uh
->dest
));
743 unsigned int i
, count
= 0;
745 spin_lock(&hslot
->lock
);
746 sk
= sk_nulls_head(&hslot
->head
);
747 dif
= inet6_iif(skb
);
748 sk
= udp_v6_mcast_next(net
, sk
, uh
->dest
, daddr
, uh
->source
, saddr
, dif
);
751 sk
= udp_v6_mcast_next(net
, sk_nulls_next(sk
), uh
->dest
, daddr
,
752 uh
->source
, saddr
, dif
);
753 if (unlikely(count
== ARRAY_SIZE(stack
))) {
756 flush_stack(stack
, count
, skb
, ~0);
761 * before releasing the lock, we must take reference on sockets
763 for (i
= 0; i
< count
; i
++)
766 spin_unlock(&hslot
->lock
);
769 flush_stack(stack
, count
, skb
, count
- 1);
771 for (i
= 0; i
< count
; i
++)
779 int __udp6_lib_rcv(struct sk_buff
*skb
, struct udp_table
*udptable
,
782 struct net
*net
= dev_net(skb
->dev
);
785 const struct in6_addr
*saddr
, *daddr
;
788 if (!pskb_may_pull(skb
, sizeof(struct udphdr
)))
791 saddr
= &ipv6_hdr(skb
)->saddr
;
792 daddr
= &ipv6_hdr(skb
)->daddr
;
795 ulen
= ntohs(uh
->len
);
799 if (proto
== IPPROTO_UDP
) {
800 /* UDP validates ulen. */
802 /* Check for jumbo payload */
806 if (ulen
< sizeof(*uh
))
809 if (ulen
< skb
->len
) {
810 if (pskb_trim_rcsum(skb
, ulen
))
812 saddr
= &ipv6_hdr(skb
)->saddr
;
813 daddr
= &ipv6_hdr(skb
)->daddr
;
818 if (udp6_csum_init(skb
, uh
, proto
))
822 * Multicast receive code
824 if (ipv6_addr_is_multicast(daddr
))
825 return __udp6_lib_mcast_deliver(net
, skb
,
826 saddr
, daddr
, udptable
);
831 * check socket cache ... must talk to Alan about his plans
832 * for sock caches... i'll skip this for now.
834 sk
= __udp6_lib_lookup_skb(skb
, uh
->source
, uh
->dest
, udptable
);
836 int ret
= udpv6_queue_rcv_skb(sk
, skb
);
839 /* a return value > 0 means to resubmit the input, but
840 * it wants the return to be -protocol, or 0
848 if (!xfrm6_policy_check(NULL
, XFRM_POLICY_IN
, skb
))
851 if (udp_lib_checksum_complete(skb
))
854 UDP6_INC_STATS_BH(net
, UDP_MIB_NOPORTS
, proto
== IPPROTO_UDPLITE
);
855 icmpv6_send(skb
, ICMPV6_DEST_UNREACH
, ICMPV6_PORT_UNREACH
, 0);
861 LIMIT_NETDEBUG(KERN_DEBUG
"UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n",
862 proto
== IPPROTO_UDPLITE
? "-Lite" : "",
871 UDP6_INC_STATS_BH(net
, UDP_MIB_INERRORS
, proto
== IPPROTO_UDPLITE
);
876 static __inline__
int udpv6_rcv(struct sk_buff
*skb
)
878 return __udp6_lib_rcv(skb
, &udp_table
, IPPROTO_UDP
);
882 * Throw away all pending data and cancel the corking. Socket is locked.
884 static void udp_v6_flush_pending_frames(struct sock
*sk
)
886 struct udp_sock
*up
= udp_sk(sk
);
888 if (up
->pending
== AF_INET
)
889 udp_flush_pending_frames(sk
);
890 else if (up
->pending
) {
893 ip6_flush_pending_frames(sk
);
898 * udp6_hwcsum_outgoing - handle outgoing HW checksumming
899 * @sk: socket we are sending on
900 * @skb: sk_buff containing the filled-in UDP header
901 * (checksum field must be zeroed out)
903 static void udp6_hwcsum_outgoing(struct sock
*sk
, struct sk_buff
*skb
,
904 const struct in6_addr
*saddr
,
905 const struct in6_addr
*daddr
, int len
)
908 struct udphdr
*uh
= udp_hdr(skb
);
911 if (skb_queue_len(&sk
->sk_write_queue
) == 1) {
912 /* Only one fragment on the socket. */
913 skb
->csum_start
= skb_transport_header(skb
) - skb
->head
;
914 skb
->csum_offset
= offsetof(struct udphdr
, check
);
915 uh
->check
= ~csum_ipv6_magic(saddr
, daddr
, len
, IPPROTO_UDP
, 0);
918 * HW-checksum won't work as there are two or more
919 * fragments on the socket so that all csums of sk_buffs
922 offset
= skb_transport_offset(skb
);
923 skb
->csum
= skb_checksum(skb
, offset
, skb
->len
- offset
, 0);
925 skb
->ip_summed
= CHECKSUM_NONE
;
927 skb_queue_walk(&sk
->sk_write_queue
, skb
) {
928 csum
= csum_add(csum
, skb
->csum
);
931 uh
->check
= csum_ipv6_magic(saddr
, daddr
, len
, IPPROTO_UDP
,
934 uh
->check
= CSUM_MANGLED_0
;
942 static int udp_v6_push_pending_frames(struct sock
*sk
)
946 struct udp_sock
*up
= udp_sk(sk
);
947 struct inet_sock
*inet
= inet_sk(sk
);
948 struct flowi6
*fl6
= &inet
->cork
.fl
.u
.ip6
;
950 int is_udplite
= IS_UDPLITE(sk
);
953 /* Grab the skbuff where UDP header space exists. */
954 if ((skb
= skb_peek(&sk
->sk_write_queue
)) == NULL
)
958 * Create a UDP header
961 uh
->source
= fl6
->fl6_sport
;
962 uh
->dest
= fl6
->fl6_dport
;
963 uh
->len
= htons(up
->len
);
967 csum
= udplite_csum_outgoing(sk
, skb
);
968 else if (skb
->ip_summed
== CHECKSUM_PARTIAL
) { /* UDP hardware csum */
969 udp6_hwcsum_outgoing(sk
, skb
, &fl6
->saddr
, &fl6
->daddr
,
973 csum
= udp_csum_outgoing(sk
, skb
);
975 /* add protocol-dependent pseudo-header */
976 uh
->check
= csum_ipv6_magic(&fl6
->saddr
, &fl6
->daddr
,
977 up
->len
, fl6
->flowi6_proto
, csum
);
979 uh
->check
= CSUM_MANGLED_0
;
982 err
= ip6_push_pending_frames(sk
);
984 if (err
== -ENOBUFS
&& !inet6_sk(sk
)->recverr
) {
985 UDP6_INC_STATS_USER(sock_net(sk
),
986 UDP_MIB_SNDBUFERRORS
, is_udplite
);
990 UDP6_INC_STATS_USER(sock_net(sk
),
991 UDP_MIB_OUTDATAGRAMS
, is_udplite
);
998 int udpv6_sendmsg(struct kiocb
*iocb
, struct sock
*sk
,
999 struct msghdr
*msg
, size_t len
)
1001 struct ipv6_txoptions opt_space
;
1002 struct udp_sock
*up
= udp_sk(sk
);
1003 struct inet_sock
*inet
= inet_sk(sk
);
1004 struct ipv6_pinfo
*np
= inet6_sk(sk
);
1005 struct sockaddr_in6
*sin6
= (struct sockaddr_in6
*) msg
->msg_name
;
1006 struct in6_addr
*daddr
, *final_p
, final
;
1007 struct ipv6_txoptions
*opt
= NULL
;
1008 struct ip6_flowlabel
*flowlabel
= NULL
;
1010 struct dst_entry
*dst
;
1011 int addr_len
= msg
->msg_namelen
;
1016 int corkreq
= up
->corkflag
|| msg
->msg_flags
&MSG_MORE
;
1019 int is_udplite
= IS_UDPLITE(sk
);
1020 int (*getfrag
)(void *, char *, int, int, int, struct sk_buff
*);
1022 /* destination address check */
1024 if (addr_len
< offsetof(struct sockaddr
, sa_data
))
1027 switch (sin6
->sin6_family
) {
1029 if (addr_len
< SIN6_LEN_RFC2133
)
1031 daddr
= &sin6
->sin6_addr
;
1034 goto do_udp_sendmsg
;
1036 msg
->msg_name
= sin6
= NULL
;
1037 msg
->msg_namelen
= addr_len
= 0;
1043 } else if (!up
->pending
) {
1044 if (sk
->sk_state
!= TCP_ESTABLISHED
)
1045 return -EDESTADDRREQ
;
1051 if (ipv6_addr_v4mapped(daddr
)) {
1052 struct sockaddr_in sin
;
1053 sin
.sin_family
= AF_INET
;
1054 sin
.sin_port
= sin6
? sin6
->sin6_port
: inet
->inet_dport
;
1055 sin
.sin_addr
.s_addr
= daddr
->s6_addr32
[3];
1056 msg
->msg_name
= &sin
;
1057 msg
->msg_namelen
= sizeof(sin
);
1059 if (__ipv6_only_sock(sk
))
1060 return -ENETUNREACH
;
1061 return udp_sendmsg(iocb
, sk
, msg
, len
);
1065 if (up
->pending
== AF_INET
)
1066 return udp_sendmsg(iocb
, sk
, msg
, len
);
1068 /* Rough check on arithmetic overflow,
1069 better check is made in ip6_append_data().
1071 if (len
> INT_MAX
- sizeof(struct udphdr
))
1076 * There are pending frames.
1077 * The socket lock must be held while it's corked.
1080 if (likely(up
->pending
)) {
1081 if (unlikely(up
->pending
!= AF_INET6
)) {
1083 return -EAFNOSUPPORT
;
1086 goto do_append_data
;
1090 ulen
+= sizeof(struct udphdr
);
1092 memset(&fl6
, 0, sizeof(fl6
));
1095 if (sin6
->sin6_port
== 0)
1098 fl6
.fl6_dport
= sin6
->sin6_port
;
1099 daddr
= &sin6
->sin6_addr
;
1102 fl6
.flowlabel
= sin6
->sin6_flowinfo
&IPV6_FLOWINFO_MASK
;
1103 if (fl6
.flowlabel
&IPV6_FLOWLABEL_MASK
) {
1104 flowlabel
= fl6_sock_lookup(sk
, fl6
.flowlabel
);
1105 if (flowlabel
== NULL
)
1107 daddr
= &flowlabel
->dst
;
1112 * Otherwise it will be difficult to maintain
1115 if (sk
->sk_state
== TCP_ESTABLISHED
&&
1116 ipv6_addr_equal(daddr
, &np
->daddr
))
1119 if (addr_len
>= sizeof(struct sockaddr_in6
) &&
1120 sin6
->sin6_scope_id
&&
1121 ipv6_addr_type(daddr
)&IPV6_ADDR_LINKLOCAL
)
1122 fl6
.flowi6_oif
= sin6
->sin6_scope_id
;
1124 if (sk
->sk_state
!= TCP_ESTABLISHED
)
1125 return -EDESTADDRREQ
;
1127 fl6
.fl6_dport
= inet
->inet_dport
;
1129 fl6
.flowlabel
= np
->flow_label
;
1133 if (!fl6
.flowi6_oif
)
1134 fl6
.flowi6_oif
= sk
->sk_bound_dev_if
;
1136 if (!fl6
.flowi6_oif
)
1137 fl6
.flowi6_oif
= np
->sticky_pktinfo
.ipi6_ifindex
;
1139 fl6
.flowi6_mark
= sk
->sk_mark
;
1141 if (msg
->msg_controllen
) {
1143 memset(opt
, 0, sizeof(struct ipv6_txoptions
));
1144 opt
->tot_len
= sizeof(*opt
);
1146 err
= ip6_datagram_send_ctl(sock_net(sk
), sk
, msg
, &fl6
, opt
,
1147 &hlimit
, &tclass
, &dontfrag
);
1149 fl6_sock_release(flowlabel
);
1152 if ((fl6
.flowlabel
&IPV6_FLOWLABEL_MASK
) && !flowlabel
) {
1153 flowlabel
= fl6_sock_lookup(sk
, fl6
.flowlabel
);
1154 if (flowlabel
== NULL
)
1157 if (!(opt
->opt_nflen
|opt
->opt_flen
))
1164 opt
= fl6_merge_options(&opt_space
, flowlabel
, opt
);
1165 opt
= ipv6_fixup_options(&opt_space
, opt
);
1167 fl6
.flowi6_proto
= sk
->sk_protocol
;
1168 if (!ipv6_addr_any(daddr
))
1171 fl6
.daddr
.s6_addr
[15] = 0x1; /* :: means loopback (BSD'ism) */
1172 if (ipv6_addr_any(&fl6
.saddr
) && !ipv6_addr_any(&np
->saddr
))
1173 fl6
.saddr
= np
->saddr
;
1174 fl6
.fl6_sport
= inet
->inet_sport
;
1176 final_p
= fl6_update_dst(&fl6
, opt
, &final
);
1180 if (!fl6
.flowi6_oif
&& ipv6_addr_is_multicast(&fl6
.daddr
)) {
1181 fl6
.flowi6_oif
= np
->mcast_oif
;
1183 } else if (!fl6
.flowi6_oif
)
1184 fl6
.flowi6_oif
= np
->ucast_oif
;
1186 security_sk_classify_flow(sk
, flowi6_to_flowi(&fl6
));
1188 dst
= ip6_sk_dst_lookup_flow(sk
, &fl6
, final_p
, true);
1196 if (ipv6_addr_is_multicast(&fl6
.daddr
))
1197 hlimit
= np
->mcast_hops
;
1199 hlimit
= np
->hop_limit
;
1201 hlimit
= ip6_dst_hoplimit(dst
);
1205 tclass
= np
->tclass
;
1208 dontfrag
= np
->dontfrag
;
1210 if (msg
->msg_flags
&MSG_CONFIRM
)
1215 if (unlikely(up
->pending
)) {
1216 /* The socket is already corked while preparing it. */
1217 /* ... which is an evident application bug. --ANK */
1220 LIMIT_NETDEBUG(KERN_DEBUG
"udp cork app bug 2\n");
1225 up
->pending
= AF_INET6
;
1229 getfrag
= is_udplite
? udplite_getfrag
: ip_generic_getfrag
;
1230 err
= ip6_append_data(sk
, getfrag
, msg
->msg_iov
, ulen
,
1231 sizeof(struct udphdr
), hlimit
, tclass
, opt
, &fl6
,
1232 (struct rt6_info
*)dst
,
1233 corkreq
? msg
->msg_flags
|MSG_MORE
: msg
->msg_flags
, dontfrag
);
1235 udp_v6_flush_pending_frames(sk
);
1237 err
= udp_v6_push_pending_frames(sk
);
1238 else if (unlikely(skb_queue_empty(&sk
->sk_write_queue
)))
1243 ip6_dst_store(sk
, dst
,
1244 ipv6_addr_equal(&fl6
.daddr
, &np
->daddr
) ?
1246 #ifdef CONFIG_IPV6_SUBTREES
1247 ipv6_addr_equal(&fl6
.saddr
, &np
->saddr
) ?
1258 err
= np
->recverr
? net_xmit_errno(err
) : 0;
1262 fl6_sock_release(flowlabel
);
1266 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
1267 * ENOBUFS might not be good (it's not tunable per se), but otherwise
1268 * we don't have a good statistic (IpOutDiscards but it can be too many
1269 * things). We could add another new stat but at least for now that
1270 * seems like overkill.
1272 if (err
== -ENOBUFS
|| test_bit(SOCK_NOSPACE
, &sk
->sk_socket
->flags
)) {
1273 UDP6_INC_STATS_USER(sock_net(sk
),
1274 UDP_MIB_SNDBUFERRORS
, is_udplite
);
1280 if (!(msg
->msg_flags
&MSG_PROBE
) || len
)
1281 goto back_from_confirm
;
1286 void udpv6_destroy_sock(struct sock
*sk
)
1289 udp_v6_flush_pending_frames(sk
);
1292 inet6_destroy_sock(sk
);
1296 * Socket option code for UDP
1298 int udpv6_setsockopt(struct sock
*sk
, int level
, int optname
,
1299 char __user
*optval
, unsigned int optlen
)
1301 if (level
== SOL_UDP
|| level
== SOL_UDPLITE
)
1302 return udp_lib_setsockopt(sk
, level
, optname
, optval
, optlen
,
1303 udp_v6_push_pending_frames
);
1304 return ipv6_setsockopt(sk
, level
, optname
, optval
, optlen
);
1307 #ifdef CONFIG_COMPAT
1308 int compat_udpv6_setsockopt(struct sock
*sk
, int level
, int optname
,
1309 char __user
*optval
, unsigned int optlen
)
1311 if (level
== SOL_UDP
|| level
== SOL_UDPLITE
)
1312 return udp_lib_setsockopt(sk
, level
, optname
, optval
, optlen
,
1313 udp_v6_push_pending_frames
);
1314 return compat_ipv6_setsockopt(sk
, level
, optname
, optval
, optlen
);
1318 int udpv6_getsockopt(struct sock
*sk
, int level
, int optname
,
1319 char __user
*optval
, int __user
*optlen
)
1321 if (level
== SOL_UDP
|| level
== SOL_UDPLITE
)
1322 return udp_lib_getsockopt(sk
, level
, optname
, optval
, optlen
);
1323 return ipv6_getsockopt(sk
, level
, optname
, optval
, optlen
);
1326 #ifdef CONFIG_COMPAT
1327 int compat_udpv6_getsockopt(struct sock
*sk
, int level
, int optname
,
1328 char __user
*optval
, int __user
*optlen
)
1330 if (level
== SOL_UDP
|| level
== SOL_UDPLITE
)
1331 return udp_lib_getsockopt(sk
, level
, optname
, optval
, optlen
);
1332 return compat_ipv6_getsockopt(sk
, level
, optname
, optval
, optlen
);
1336 static const struct inet6_protocol udpv6_protocol
= {
1337 .handler
= udpv6_rcv
,
1338 .err_handler
= udpv6_err
,
1339 .flags
= INET6_PROTO_NOPOLICY
|INET6_PROTO_FINAL
,
1342 /* ------------------------------------------------------------------------ */
1343 #ifdef CONFIG_PROC_FS
1345 static void udp6_sock_seq_show(struct seq_file
*seq
, struct sock
*sp
, int bucket
)
1347 struct inet_sock
*inet
= inet_sk(sp
);
1348 struct ipv6_pinfo
*np
= inet6_sk(sp
);
1349 const struct in6_addr
*dest
, *src
;
1353 src
= &np
->rcv_saddr
;
1354 destp
= ntohs(inet
->inet_dport
);
1355 srcp
= ntohs(inet
->inet_sport
);
1357 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1358 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %d\n",
1360 src
->s6_addr32
[0], src
->s6_addr32
[1],
1361 src
->s6_addr32
[2], src
->s6_addr32
[3], srcp
,
1362 dest
->s6_addr32
[0], dest
->s6_addr32
[1],
1363 dest
->s6_addr32
[2], dest
->s6_addr32
[3], destp
,
1365 sk_wmem_alloc_get(sp
),
1366 sk_rmem_alloc_get(sp
),
1368 from_kuid_munged(seq_user_ns(seq
), sock_i_uid(sp
)),
1371 atomic_read(&sp
->sk_refcnt
), sp
,
1372 atomic_read(&sp
->sk_drops
));
1375 int udp6_seq_show(struct seq_file
*seq
, void *v
)
1377 if (v
== SEQ_START_TOKEN
)
1382 "st tx_queue rx_queue tr tm->when retrnsmt"
1383 " uid timeout inode ref pointer drops\n");
1385 udp6_sock_seq_show(seq
, v
, ((struct udp_iter_state
*)seq
->private)->bucket
);
1389 static const struct file_operations udp6_afinfo_seq_fops
= {
1390 .owner
= THIS_MODULE
,
1391 .open
= udp_seq_open
,
1393 .llseek
= seq_lseek
,
1394 .release
= seq_release_net
1397 static struct udp_seq_afinfo udp6_seq_afinfo
= {
1400 .udp_table
= &udp_table
,
1401 .seq_fops
= &udp6_afinfo_seq_fops
,
1403 .show
= udp6_seq_show
,
1407 int __net_init
udp6_proc_init(struct net
*net
)
1409 return udp_proc_register(net
, &udp6_seq_afinfo
);
1412 void udp6_proc_exit(struct net
*net
) {
1413 udp_proc_unregister(net
, &udp6_seq_afinfo
);
1415 #endif /* CONFIG_PROC_FS */
1417 /* ------------------------------------------------------------------------ */
1419 struct proto udpv6_prot
= {
1421 .owner
= THIS_MODULE
,
1422 .close
= udp_lib_close
,
1423 .connect
= ip6_datagram_connect
,
1424 .disconnect
= udp_disconnect
,
1426 .destroy
= udpv6_destroy_sock
,
1427 .setsockopt
= udpv6_setsockopt
,
1428 .getsockopt
= udpv6_getsockopt
,
1429 .sendmsg
= udpv6_sendmsg
,
1430 .recvmsg
= udpv6_recvmsg
,
1431 .backlog_rcv
= __udpv6_queue_rcv_skb
,
1432 .hash
= udp_lib_hash
,
1433 .unhash
= udp_lib_unhash
,
1434 .rehash
= udp_v6_rehash
,
1435 .get_port
= udp_v6_get_port
,
1436 .memory_allocated
= &udp_memory_allocated
,
1437 .sysctl_mem
= sysctl_udp_mem
,
1438 .sysctl_wmem
= &sysctl_udp_wmem_min
,
1439 .sysctl_rmem
= &sysctl_udp_rmem_min
,
1440 .obj_size
= sizeof(struct udp6_sock
),
1441 .slab_flags
= SLAB_DESTROY_BY_RCU
,
1442 .h
.udp_table
= &udp_table
,
1443 #ifdef CONFIG_COMPAT
1444 .compat_setsockopt
= compat_udpv6_setsockopt
,
1445 .compat_getsockopt
= compat_udpv6_getsockopt
,
1447 .clear_sk
= sk_prot_clear_portaddr_nulls
,
1450 static struct inet_protosw udpv6_protosw
= {
1452 .protocol
= IPPROTO_UDP
,
1453 .prot
= &udpv6_prot
,
1454 .ops
= &inet6_dgram_ops
,
1455 .no_check
= UDP_CSUM_DEFAULT
,
1456 .flags
= INET_PROTOSW_PERMANENT
,
1460 int __init
udpv6_init(void)
1464 ret
= inet6_add_protocol(&udpv6_protocol
, IPPROTO_UDP
);
1468 ret
= inet6_register_protosw(&udpv6_protosw
);
1470 goto out_udpv6_protocol
;
1475 inet6_del_protocol(&udpv6_protocol
, IPPROTO_UDP
);
1479 void udpv6_exit(void)
1481 inet6_unregister_protosw(&udpv6_protosw
);
1482 inet6_del_protocol(&udpv6_protocol
, IPPROTO_UDP
);