3 * Linux INET6 implementation
6 * Pedro Roque <roque@di.fc.ul.pt>
8 * Based on linux/ipv4/udp.c
11 * Hideaki YOSHIFUJI : sin6_scope_id support
12 * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which
13 * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind
14 * a single port at the same time.
15 * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data
16 * YOSHIFUJI Hideaki @USAGI: convert /proc/net/udp6 to seq_file.
18 * This program is free software; you can redistribute it and/or
19 * modify it under the terms of the GNU General Public License
20 * as published by the Free Software Foundation; either version
21 * 2 of the License, or (at your option) any later version.
24 #include <linux/errno.h>
25 #include <linux/types.h>
26 #include <linux/socket.h>
27 #include <linux/sockios.h>
28 #include <linux/net.h>
29 #include <linux/in6.h>
30 #include <linux/netdevice.h>
31 #include <linux/if_arp.h>
32 #include <linux/ipv6.h>
33 #include <linux/icmpv6.h>
34 #include <linux/init.h>
35 #include <linux/module.h>
36 #include <linux/skbuff.h>
37 #include <linux/slab.h>
38 #include <asm/uaccess.h>
40 #include <net/ndisc.h>
41 #include <net/protocol.h>
42 #include <net/transp_v6.h>
43 #include <net/ip6_route.h>
45 #include <net/tcp_states.h>
46 #include <net/ip6_checksum.h>
48 #include <net/inet6_hashtables.h>
49 #include <net/busy_poll.h>
51 #include <linux/proc_fs.h>
52 #include <linux/seq_file.h>
53 #include <trace/events/skb.h>
56 int ipv6_rcv_saddr_equal(const struct sock
*sk
, const struct sock
*sk2
)
58 const struct in6_addr
*sk_rcv_saddr6
= &inet6_sk(sk
)->rcv_saddr
;
59 const struct in6_addr
*sk2_rcv_saddr6
= inet6_rcv_saddr(sk2
);
60 __be32 sk1_rcv_saddr
= sk_rcv_saddr(sk
);
61 __be32 sk2_rcv_saddr
= sk_rcv_saddr(sk2
);
62 int sk_ipv6only
= ipv6_only_sock(sk
);
63 int sk2_ipv6only
= inet_v6_ipv6only(sk2
);
64 int addr_type
= ipv6_addr_type(sk_rcv_saddr6
);
65 int addr_type2
= sk2_rcv_saddr6
? ipv6_addr_type(sk2_rcv_saddr6
) : IPV6_ADDR_MAPPED
;
67 /* if both are mapped, treat as IPv4 */
68 if (addr_type
== IPV6_ADDR_MAPPED
&& addr_type2
== IPV6_ADDR_MAPPED
)
69 return (!sk2_ipv6only
&&
70 (!sk1_rcv_saddr
|| !sk2_rcv_saddr
||
71 sk1_rcv_saddr
== sk2_rcv_saddr
));
73 if (addr_type2
== IPV6_ADDR_ANY
&&
74 !(sk2_ipv6only
&& addr_type
== IPV6_ADDR_MAPPED
))
77 if (addr_type
== IPV6_ADDR_ANY
&&
78 !(sk_ipv6only
&& addr_type2
== IPV6_ADDR_MAPPED
))
82 ipv6_addr_equal(sk_rcv_saddr6
, sk2_rcv_saddr6
))
88 static unsigned int udp6_portaddr_hash(struct net
*net
,
89 const struct in6_addr
*addr6
,
92 unsigned int hash
, mix
= net_hash_mix(net
);
94 if (ipv6_addr_any(addr6
))
95 hash
= jhash_1word(0, mix
);
96 else if (ipv6_addr_v4mapped(addr6
))
97 hash
= jhash_1word((__force u32
)addr6
->s6_addr32
[3], mix
);
99 hash
= jhash2((__force u32
*)addr6
->s6_addr32
, 4, mix
);
105 int udp_v6_get_port(struct sock
*sk
, unsigned short snum
)
107 unsigned int hash2_nulladdr
=
108 udp6_portaddr_hash(sock_net(sk
), &in6addr_any
, snum
);
109 unsigned int hash2_partial
=
110 udp6_portaddr_hash(sock_net(sk
), &inet6_sk(sk
)->rcv_saddr
, 0);
112 /* precompute partial secondary hash */
113 udp_sk(sk
)->udp_portaddr_hash
= hash2_partial
;
114 return udp_lib_get_port(sk
, snum
, ipv6_rcv_saddr_equal
, hash2_nulladdr
);
117 static void udp_v6_rehash(struct sock
*sk
)
119 u16 new_hash
= udp6_portaddr_hash(sock_net(sk
),
120 &inet6_sk(sk
)->rcv_saddr
,
121 inet_sk(sk
)->inet_num
);
123 udp_lib_rehash(sk
, new_hash
);
126 static inline int compute_score(struct sock
*sk
, struct net
*net
,
128 const struct in6_addr
*saddr
, __be16 sport
,
129 const struct in6_addr
*daddr
, __be16 dport
,
134 if (net_eq(sock_net(sk
), net
) && udp_sk(sk
)->udp_port_hash
== hnum
&&
135 sk
->sk_family
== PF_INET6
) {
136 struct ipv6_pinfo
*np
= inet6_sk(sk
);
137 struct inet_sock
*inet
= inet_sk(sk
);
140 if (inet
->inet_dport
) {
141 if (inet
->inet_dport
!= sport
)
145 if (!ipv6_addr_any(&np
->rcv_saddr
)) {
146 if (!ipv6_addr_equal(&np
->rcv_saddr
, daddr
))
150 if (!ipv6_addr_any(&np
->daddr
)) {
151 if (!ipv6_addr_equal(&np
->daddr
, saddr
))
155 if (sk
->sk_bound_dev_if
) {
156 if (sk
->sk_bound_dev_if
!= dif
)
164 #define SCORE2_MAX (1 + 1 + 1)
165 static inline int compute_score2(struct sock
*sk
, struct net
*net
,
166 const struct in6_addr
*saddr
, __be16 sport
,
167 const struct in6_addr
*daddr
, unsigned short hnum
,
172 if (net_eq(sock_net(sk
), net
) && udp_sk(sk
)->udp_port_hash
== hnum
&&
173 sk
->sk_family
== PF_INET6
) {
174 struct ipv6_pinfo
*np
= inet6_sk(sk
);
175 struct inet_sock
*inet
= inet_sk(sk
);
177 if (!ipv6_addr_equal(&np
->rcv_saddr
, daddr
))
180 if (inet
->inet_dport
) {
181 if (inet
->inet_dport
!= sport
)
185 if (!ipv6_addr_any(&np
->daddr
)) {
186 if (!ipv6_addr_equal(&np
->daddr
, saddr
))
190 if (sk
->sk_bound_dev_if
) {
191 if (sk
->sk_bound_dev_if
!= dif
)
200 /* called with read_rcu_lock() */
201 static struct sock
*udp6_lib_lookup2(struct net
*net
,
202 const struct in6_addr
*saddr
, __be16 sport
,
203 const struct in6_addr
*daddr
, unsigned int hnum
, int dif
,
204 struct udp_hslot
*hslot2
, unsigned int slot2
)
206 struct sock
*sk
, *result
;
207 struct hlist_nulls_node
*node
;
208 int score
, badness
, matches
= 0, reuseport
= 0;
214 udp_portaddr_for_each_entry_rcu(sk
, node
, &hslot2
->head
) {
215 score
= compute_score2(sk
, net
, saddr
, sport
,
217 if (score
> badness
) {
220 reuseport
= sk
->sk_reuseport
;
222 hash
= inet6_ehashfn(net
, daddr
, hnum
,
225 } else if (score
== SCORE2_MAX
)
227 } else if (score
== badness
&& reuseport
) {
229 if (((u64
)hash
* matches
) >> 32 == 0)
231 hash
= next_pseudo_random32(hash
);
235 * if the nulls value we got at the end of this lookup is
236 * not the expected one, we must restart lookup.
237 * We probably met an item that was moved to another chain.
239 if (get_nulls_value(node
) != slot2
)
244 if (unlikely(!atomic_inc_not_zero_hint(&result
->sk_refcnt
, 2)))
246 else if (unlikely(compute_score2(result
, net
, saddr
, sport
,
247 daddr
, hnum
, dif
) < badness
)) {
255 struct sock
*__udp6_lib_lookup(struct net
*net
,
256 const struct in6_addr
*saddr
, __be16 sport
,
257 const struct in6_addr
*daddr
, __be16 dport
,
258 int dif
, struct udp_table
*udptable
)
260 struct sock
*sk
, *result
;
261 struct hlist_nulls_node
*node
;
262 unsigned short hnum
= ntohs(dport
);
263 unsigned int hash2
, slot2
, slot
= udp_hashfn(net
, hnum
, udptable
->mask
);
264 struct udp_hslot
*hslot2
, *hslot
= &udptable
->hash
[slot
];
265 int score
, badness
, matches
= 0, reuseport
= 0;
269 if (hslot
->count
> 10) {
270 hash2
= udp6_portaddr_hash(net
, daddr
, hnum
);
271 slot2
= hash2
& udptable
->mask
;
272 hslot2
= &udptable
->hash2
[slot2
];
273 if (hslot
->count
< hslot2
->count
)
276 result
= udp6_lib_lookup2(net
, saddr
, sport
,
280 hash2
= udp6_portaddr_hash(net
, &in6addr_any
, hnum
);
281 slot2
= hash2
& udptable
->mask
;
282 hslot2
= &udptable
->hash2
[slot2
];
283 if (hslot
->count
< hslot2
->count
)
286 result
= udp6_lib_lookup2(net
, saddr
, sport
,
287 &in6addr_any
, hnum
, dif
,
296 sk_nulls_for_each_rcu(sk
, node
, &hslot
->head
) {
297 score
= compute_score(sk
, net
, hnum
, saddr
, sport
, daddr
, dport
, dif
);
298 if (score
> badness
) {
301 reuseport
= sk
->sk_reuseport
;
303 hash
= inet6_ehashfn(net
, daddr
, hnum
,
307 } else if (score
== badness
&& reuseport
) {
309 if (((u64
)hash
* matches
) >> 32 == 0)
311 hash
= next_pseudo_random32(hash
);
315 * if the nulls value we got at the end of this lookup is
316 * not the expected one, we must restart lookup.
317 * We probably met an item that was moved to another chain.
319 if (get_nulls_value(node
) != slot
)
323 if (unlikely(!atomic_inc_not_zero_hint(&result
->sk_refcnt
, 2)))
325 else if (unlikely(compute_score(result
, net
, hnum
, saddr
, sport
,
326 daddr
, dport
, dif
) < badness
)) {
334 EXPORT_SYMBOL_GPL(__udp6_lib_lookup
);
336 static struct sock
*__udp6_lib_lookup_skb(struct sk_buff
*skb
,
337 __be16 sport
, __be16 dport
,
338 struct udp_table
*udptable
)
341 const struct ipv6hdr
*iph
= ipv6_hdr(skb
);
343 if (unlikely(sk
= skb_steal_sock(skb
)))
345 return __udp6_lib_lookup(dev_net(skb_dst(skb
)->dev
), &iph
->saddr
, sport
,
346 &iph
->daddr
, dport
, inet6_iif(skb
),
350 struct sock
*udp6_lib_lookup(struct net
*net
, const struct in6_addr
*saddr
, __be16 sport
,
351 const struct in6_addr
*daddr
, __be16 dport
, int dif
)
353 return __udp6_lib_lookup(net
, saddr
, sport
, daddr
, dport
, dif
, &udp_table
);
355 EXPORT_SYMBOL_GPL(udp6_lib_lookup
);
359 * This should be easy, if there is something there we
360 * return it, otherwise we block.
363 int udpv6_recvmsg(struct kiocb
*iocb
, struct sock
*sk
,
364 struct msghdr
*msg
, size_t len
,
365 int noblock
, int flags
, int *addr_len
)
367 struct ipv6_pinfo
*np
= inet6_sk(sk
);
368 struct inet_sock
*inet
= inet_sk(sk
);
370 unsigned int ulen
, copied
;
373 int is_udplite
= IS_UDPLITE(sk
);
378 *addr_len
= sizeof(struct sockaddr_in6
);
380 if (flags
& MSG_ERRQUEUE
)
381 return ipv6_recv_error(sk
, msg
, len
);
383 if (np
->rxpmtu
&& np
->rxopt
.bits
.rxpmtu
)
384 return ipv6_recv_rxpmtu(sk
, msg
, len
);
387 skb
= __skb_recv_datagram(sk
, flags
| (noblock
? MSG_DONTWAIT
: 0),
388 &peeked
, &off
, &err
);
392 ulen
= skb
->len
- sizeof(struct udphdr
);
396 else if (copied
< ulen
)
397 msg
->msg_flags
|= MSG_TRUNC
;
399 is_udp4
= (skb
->protocol
== htons(ETH_P_IP
));
402 * If checksum is needed at all, try to do it while copying the
403 * data. If the data is truncated, or if we only want a partial
404 * coverage checksum (UDP-Lite), do it before the copy.
407 if (copied
< ulen
|| UDP_SKB_CB(skb
)->partial_cov
) {
408 if (udp_lib_checksum_complete(skb
))
412 if (skb_csum_unnecessary(skb
))
413 err
= skb_copy_datagram_iovec(skb
, sizeof(struct udphdr
),
414 msg
->msg_iov
, copied
);
416 err
= skb_copy_and_csum_datagram_iovec(skb
, sizeof(struct udphdr
), msg
->msg_iov
);
421 trace_kfree_skb(skb
, udpv6_recvmsg
);
423 atomic_inc(&sk
->sk_drops
);
425 UDP_INC_STATS_USER(sock_net(sk
),
429 UDP6_INC_STATS_USER(sock_net(sk
),
437 UDP_INC_STATS_USER(sock_net(sk
),
438 UDP_MIB_INDATAGRAMS
, is_udplite
);
440 UDP6_INC_STATS_USER(sock_net(sk
),
441 UDP_MIB_INDATAGRAMS
, is_udplite
);
444 sock_recv_ts_and_drops(msg
, sk
, skb
);
446 /* Copy the address. */
448 struct sockaddr_in6
*sin6
;
450 sin6
= (struct sockaddr_in6
*) msg
->msg_name
;
451 sin6
->sin6_family
= AF_INET6
;
452 sin6
->sin6_port
= udp_hdr(skb
)->source
;
453 sin6
->sin6_flowinfo
= 0;
456 ipv6_addr_set_v4mapped(ip_hdr(skb
)->saddr
,
458 sin6
->sin6_scope_id
= 0;
460 sin6
->sin6_addr
= ipv6_hdr(skb
)->saddr
;
461 sin6
->sin6_scope_id
=
462 ipv6_iface_scope_id(&sin6
->sin6_addr
,
468 if (inet
->cmsg_flags
)
469 ip_cmsg_recv(msg
, skb
);
472 ip6_datagram_recv_ctl(sk
, msg
, skb
);
476 if (flags
& MSG_TRUNC
)
480 skb_free_datagram_locked(sk
, skb
);
485 slow
= lock_sock_fast(sk
);
486 if (!skb_kill_datagram(sk
, skb
, flags
)) {
488 UDP_INC_STATS_USER(sock_net(sk
),
489 UDP_MIB_CSUMERRORS
, is_udplite
);
490 UDP_INC_STATS_USER(sock_net(sk
),
491 UDP_MIB_INERRORS
, is_udplite
);
493 UDP6_INC_STATS_USER(sock_net(sk
),
494 UDP_MIB_CSUMERRORS
, is_udplite
);
495 UDP6_INC_STATS_USER(sock_net(sk
),
496 UDP_MIB_INERRORS
, is_udplite
);
499 unlock_sock_fast(sk
, slow
);
504 /* starting over for a new packet */
505 msg
->msg_flags
&= ~MSG_TRUNC
;
509 void __udp6_lib_err(struct sk_buff
*skb
, struct inet6_skb_parm
*opt
,
510 u8 type
, u8 code
, int offset
, __be32 info
,
511 struct udp_table
*udptable
)
513 struct ipv6_pinfo
*np
;
514 const struct ipv6hdr
*hdr
= (const struct ipv6hdr
*)skb
->data
;
515 const struct in6_addr
*saddr
= &hdr
->saddr
;
516 const struct in6_addr
*daddr
= &hdr
->daddr
;
517 struct udphdr
*uh
= (struct udphdr
*)(skb
->data
+offset
);
521 sk
= __udp6_lib_lookup(dev_net(skb
->dev
), daddr
, uh
->dest
,
522 saddr
, uh
->source
, inet6_iif(skb
), udptable
);
526 if (type
== ICMPV6_PKT_TOOBIG
)
527 ip6_sk_update_pmtu(skb
, sk
, info
);
528 if (type
== NDISC_REDIRECT
) {
529 ip6_sk_redirect(skb
, sk
);
535 if (!icmpv6_err_convert(type
, code
, &err
) && !np
->recverr
)
538 if (sk
->sk_state
!= TCP_ESTABLISHED
&& !np
->recverr
)
542 ipv6_icmp_error(sk
, skb
, err
, uh
->dest
, ntohl(info
), (u8
*)(uh
+1));
545 sk
->sk_error_report(sk
);
550 static int __udpv6_queue_rcv_skb(struct sock
*sk
, struct sk_buff
*skb
)
554 if (!ipv6_addr_any(&inet6_sk(sk
)->daddr
))
555 sock_rps_save_rxhash(sk
, skb
);
557 rc
= sock_queue_rcv_skb(sk
, skb
);
559 int is_udplite
= IS_UDPLITE(sk
);
561 /* Note that an ENOMEM error is charged twice */
563 UDP6_INC_STATS_BH(sock_net(sk
),
564 UDP_MIB_RCVBUFERRORS
, is_udplite
);
565 UDP6_INC_STATS_BH(sock_net(sk
), UDP_MIB_INERRORS
, is_udplite
);
572 static __inline__
void udpv6_err(struct sk_buff
*skb
,
573 struct inet6_skb_parm
*opt
, u8 type
,
574 u8 code
, int offset
, __be32 info
)
576 __udp6_lib_err(skb
, opt
, type
, code
, offset
, info
, &udp_table
);
579 static struct static_key udpv6_encap_needed __read_mostly
;
580 void udpv6_encap_enable(void)
582 if (!static_key_enabled(&udpv6_encap_needed
))
583 static_key_slow_inc(&udpv6_encap_needed
);
585 EXPORT_SYMBOL(udpv6_encap_enable
);
587 int udpv6_queue_rcv_skb(struct sock
*sk
, struct sk_buff
*skb
)
589 struct udp_sock
*up
= udp_sk(sk
);
591 int is_udplite
= IS_UDPLITE(sk
);
593 if (!xfrm6_policy_check(sk
, XFRM_POLICY_IN
, skb
))
596 if (static_key_false(&udpv6_encap_needed
) && up
->encap_type
) {
597 int (*encap_rcv
)(struct sock
*sk
, struct sk_buff
*skb
);
600 * This is an encapsulation socket so pass the skb to
601 * the socket's udp_encap_rcv() hook. Otherwise, just
602 * fall through and pass this up the UDP socket.
603 * up->encap_rcv() returns the following value:
604 * =0 if skb was successfully passed to the encap
605 * handler or was discarded by it.
606 * >0 if skb should be passed on to UDP.
607 * <0 if skb should be resubmitted as proto -N
610 /* if we're overly short, let UDP handle it */
611 encap_rcv
= ACCESS_ONCE(up
->encap_rcv
);
612 if (skb
->len
> sizeof(struct udphdr
) && encap_rcv
!= NULL
) {
615 ret
= encap_rcv(sk
, skb
);
617 UDP_INC_STATS_BH(sock_net(sk
),
624 /* FALLTHROUGH -- it's a UDP Packet */
628 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
630 if ((is_udplite
& UDPLITE_RECV_CC
) && UDP_SKB_CB(skb
)->partial_cov
) {
632 if (up
->pcrlen
== 0) { /* full coverage was set */
633 LIMIT_NETDEBUG(KERN_WARNING
"UDPLITE6: partial coverage"
634 " %d while full coverage %d requested\n",
635 UDP_SKB_CB(skb
)->cscov
, skb
->len
);
638 if (UDP_SKB_CB(skb
)->cscov
< up
->pcrlen
) {
639 LIMIT_NETDEBUG(KERN_WARNING
"UDPLITE6: coverage %d "
640 "too small, need min %d\n",
641 UDP_SKB_CB(skb
)->cscov
, up
->pcrlen
);
646 if (rcu_access_pointer(sk
->sk_filter
)) {
647 if (udp_lib_checksum_complete(skb
))
651 if (sk_rcvqueues_full(sk
, skb
, sk
->sk_rcvbuf
))
658 if (!sock_owned_by_user(sk
))
659 rc
= __udpv6_queue_rcv_skb(sk
, skb
);
660 else if (sk_add_backlog(sk
, skb
, sk
->sk_rcvbuf
)) {
668 UDP6_INC_STATS_BH(sock_net(sk
), UDP_MIB_CSUMERRORS
, is_udplite
);
670 UDP6_INC_STATS_BH(sock_net(sk
), UDP_MIB_INERRORS
, is_udplite
);
671 atomic_inc(&sk
->sk_drops
);
676 static struct sock
*udp_v6_mcast_next(struct net
*net
, struct sock
*sk
,
677 __be16 loc_port
, const struct in6_addr
*loc_addr
,
678 __be16 rmt_port
, const struct in6_addr
*rmt_addr
,
681 struct hlist_nulls_node
*node
;
683 unsigned short num
= ntohs(loc_port
);
685 sk_nulls_for_each_from(s
, node
) {
686 struct inet_sock
*inet
= inet_sk(s
);
688 if (!net_eq(sock_net(s
), net
))
691 if (udp_sk(s
)->udp_port_hash
== num
&&
692 s
->sk_family
== PF_INET6
) {
693 struct ipv6_pinfo
*np
= inet6_sk(s
);
694 if (inet
->inet_dport
) {
695 if (inet
->inet_dport
!= rmt_port
)
698 if (!ipv6_addr_any(&np
->daddr
) &&
699 !ipv6_addr_equal(&np
->daddr
, rmt_addr
))
702 if (s
->sk_bound_dev_if
&& s
->sk_bound_dev_if
!= dif
)
705 if (!ipv6_addr_any(&np
->rcv_saddr
)) {
706 if (!ipv6_addr_equal(&np
->rcv_saddr
, loc_addr
))
709 if (!inet6_mc_check(s
, loc_addr
, rmt_addr
))
717 static void flush_stack(struct sock
**stack
, unsigned int count
,
718 struct sk_buff
*skb
, unsigned int final
)
720 struct sk_buff
*skb1
= NULL
;
724 for (i
= 0; i
< count
; i
++) {
726 if (likely(skb1
== NULL
))
727 skb1
= (i
== final
) ? skb
: skb_clone(skb
, GFP_ATOMIC
);
729 atomic_inc(&sk
->sk_drops
);
730 UDP6_INC_STATS_BH(sock_net(sk
), UDP_MIB_RCVBUFERRORS
,
732 UDP6_INC_STATS_BH(sock_net(sk
), UDP_MIB_INERRORS
,
736 if (skb1
&& udpv6_queue_rcv_skb(sk
, skb1
) <= 0)
743 * Note: called only from the BH handler context,
744 * so we don't need to lock the hashes.
746 static int __udp6_lib_mcast_deliver(struct net
*net
, struct sk_buff
*skb
,
747 const struct in6_addr
*saddr
, const struct in6_addr
*daddr
,
748 struct udp_table
*udptable
)
750 struct sock
*sk
, *stack
[256 / sizeof(struct sock
*)];
751 const struct udphdr
*uh
= udp_hdr(skb
);
752 struct udp_hslot
*hslot
= udp_hashslot(udptable
, net
, ntohs(uh
->dest
));
754 unsigned int i
, count
= 0;
756 spin_lock(&hslot
->lock
);
757 sk
= sk_nulls_head(&hslot
->head
);
758 dif
= inet6_iif(skb
);
759 sk
= udp_v6_mcast_next(net
, sk
, uh
->dest
, daddr
, uh
->source
, saddr
, dif
);
762 sk
= udp_v6_mcast_next(net
, sk_nulls_next(sk
), uh
->dest
, daddr
,
763 uh
->source
, saddr
, dif
);
764 if (unlikely(count
== ARRAY_SIZE(stack
))) {
767 flush_stack(stack
, count
, skb
, ~0);
772 * before releasing the lock, we must take reference on sockets
774 for (i
= 0; i
< count
; i
++)
777 spin_unlock(&hslot
->lock
);
780 flush_stack(stack
, count
, skb
, count
- 1);
782 for (i
= 0; i
< count
; i
++)
790 int __udp6_lib_rcv(struct sk_buff
*skb
, struct udp_table
*udptable
,
793 struct net
*net
= dev_net(skb
->dev
);
796 const struct in6_addr
*saddr
, *daddr
;
799 if (!pskb_may_pull(skb
, sizeof(struct udphdr
)))
802 saddr
= &ipv6_hdr(skb
)->saddr
;
803 daddr
= &ipv6_hdr(skb
)->daddr
;
806 ulen
= ntohs(uh
->len
);
810 if (proto
== IPPROTO_UDP
) {
811 /* UDP validates ulen. */
813 /* Check for jumbo payload */
817 if (ulen
< sizeof(*uh
))
820 if (ulen
< skb
->len
) {
821 if (pskb_trim_rcsum(skb
, ulen
))
823 saddr
= &ipv6_hdr(skb
)->saddr
;
824 daddr
= &ipv6_hdr(skb
)->daddr
;
829 if (udp6_csum_init(skb
, uh
, proto
))
833 * Multicast receive code
835 if (ipv6_addr_is_multicast(daddr
))
836 return __udp6_lib_mcast_deliver(net
, skb
,
837 saddr
, daddr
, udptable
);
842 * check socket cache ... must talk to Alan about his plans
843 * for sock caches... i'll skip this for now.
845 sk
= __udp6_lib_lookup_skb(skb
, uh
->source
, uh
->dest
, udptable
);
849 sk_mark_napi_id(sk
, skb
);
850 ret
= udpv6_queue_rcv_skb(sk
, skb
);
853 /* a return value > 0 means to resubmit the input, but
854 * it wants the return to be -protocol, or 0
862 if (!xfrm6_policy_check(NULL
, XFRM_POLICY_IN
, skb
))
865 if (udp_lib_checksum_complete(skb
))
868 UDP6_INC_STATS_BH(net
, UDP_MIB_NOPORTS
, proto
== IPPROTO_UDPLITE
);
869 icmpv6_send(skb
, ICMPV6_DEST_UNREACH
, ICMPV6_PORT_UNREACH
, 0);
875 LIMIT_NETDEBUG(KERN_DEBUG
"UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n",
876 proto
== IPPROTO_UDPLITE
? "-Lite" : "",
885 UDP6_INC_STATS_BH(net
, UDP_MIB_CSUMERRORS
, proto
== IPPROTO_UDPLITE
);
887 UDP6_INC_STATS_BH(net
, UDP_MIB_INERRORS
, proto
== IPPROTO_UDPLITE
);
892 static __inline__
int udpv6_rcv(struct sk_buff
*skb
)
894 return __udp6_lib_rcv(skb
, &udp_table
, IPPROTO_UDP
);
898 * Throw away all pending data and cancel the corking. Socket is locked.
900 static void udp_v6_flush_pending_frames(struct sock
*sk
)
902 struct udp_sock
*up
= udp_sk(sk
);
904 if (up
->pending
== AF_INET
)
905 udp_flush_pending_frames(sk
);
906 else if (up
->pending
) {
909 ip6_flush_pending_frames(sk
);
914 * udp6_hwcsum_outgoing - handle outgoing HW checksumming
915 * @sk: socket we are sending on
916 * @skb: sk_buff containing the filled-in UDP header
917 * (checksum field must be zeroed out)
919 static void udp6_hwcsum_outgoing(struct sock
*sk
, struct sk_buff
*skb
,
920 const struct in6_addr
*saddr
,
921 const struct in6_addr
*daddr
, int len
)
924 struct udphdr
*uh
= udp_hdr(skb
);
927 if (skb_queue_len(&sk
->sk_write_queue
) == 1) {
928 /* Only one fragment on the socket. */
929 skb
->csum_start
= skb_transport_header(skb
) - skb
->head
;
930 skb
->csum_offset
= offsetof(struct udphdr
, check
);
931 uh
->check
= ~csum_ipv6_magic(saddr
, daddr
, len
, IPPROTO_UDP
, 0);
934 * HW-checksum won't work as there are two or more
935 * fragments on the socket so that all csums of sk_buffs
938 offset
= skb_transport_offset(skb
);
939 skb
->csum
= skb_checksum(skb
, offset
, skb
->len
- offset
, 0);
941 skb
->ip_summed
= CHECKSUM_NONE
;
943 skb_queue_walk(&sk
->sk_write_queue
, skb
) {
944 csum
= csum_add(csum
, skb
->csum
);
947 uh
->check
= csum_ipv6_magic(saddr
, daddr
, len
, IPPROTO_UDP
,
950 uh
->check
= CSUM_MANGLED_0
;
958 static int udp_v6_push_pending_frames(struct sock
*sk
)
962 struct udp_sock
*up
= udp_sk(sk
);
963 struct inet_sock
*inet
= inet_sk(sk
);
966 int is_udplite
= IS_UDPLITE(sk
);
969 if (up
->pending
== AF_INET
)
970 return udp_push_pending_frames(sk
);
972 fl6
= &inet
->cork
.fl
.u
.ip6
;
974 /* Grab the skbuff where UDP header space exists. */
975 if ((skb
= skb_peek(&sk
->sk_write_queue
)) == NULL
)
979 * Create a UDP header
982 uh
->source
= fl6
->fl6_sport
;
983 uh
->dest
= fl6
->fl6_dport
;
984 uh
->len
= htons(up
->len
);
988 csum
= udplite_csum_outgoing(sk
, skb
);
989 else if (skb
->ip_summed
== CHECKSUM_PARTIAL
) { /* UDP hardware csum */
990 udp6_hwcsum_outgoing(sk
, skb
, &fl6
->saddr
, &fl6
->daddr
,
994 csum
= udp_csum_outgoing(sk
, skb
);
996 /* add protocol-dependent pseudo-header */
997 uh
->check
= csum_ipv6_magic(&fl6
->saddr
, &fl6
->daddr
,
998 up
->len
, fl6
->flowi6_proto
, csum
);
1000 uh
->check
= CSUM_MANGLED_0
;
1003 err
= ip6_push_pending_frames(sk
);
1005 if (err
== -ENOBUFS
&& !inet6_sk(sk
)->recverr
) {
1006 UDP6_INC_STATS_USER(sock_net(sk
),
1007 UDP_MIB_SNDBUFERRORS
, is_udplite
);
1011 UDP6_INC_STATS_USER(sock_net(sk
),
1012 UDP_MIB_OUTDATAGRAMS
, is_udplite
);
1019 int udpv6_sendmsg(struct kiocb
*iocb
, struct sock
*sk
,
1020 struct msghdr
*msg
, size_t len
)
1022 struct ipv6_txoptions opt_space
;
1023 struct udp_sock
*up
= udp_sk(sk
);
1024 struct inet_sock
*inet
= inet_sk(sk
);
1025 struct ipv6_pinfo
*np
= inet6_sk(sk
);
1026 struct sockaddr_in6
*sin6
= (struct sockaddr_in6
*) msg
->msg_name
;
1027 struct in6_addr
*daddr
, *final_p
, final
;
1028 struct ipv6_txoptions
*opt
= NULL
;
1029 struct ip6_flowlabel
*flowlabel
= NULL
;
1031 struct dst_entry
*dst
;
1032 int addr_len
= msg
->msg_namelen
;
1037 int corkreq
= up
->corkflag
|| msg
->msg_flags
&MSG_MORE
;
1040 int is_udplite
= IS_UDPLITE(sk
);
1041 int (*getfrag
)(void *, char *, int, int, int, struct sk_buff
*);
1043 /* destination address check */
1045 if (addr_len
< offsetof(struct sockaddr
, sa_data
))
1048 switch (sin6
->sin6_family
) {
1050 if (addr_len
< SIN6_LEN_RFC2133
)
1052 daddr
= &sin6
->sin6_addr
;
1055 goto do_udp_sendmsg
;
1057 msg
->msg_name
= sin6
= NULL
;
1058 msg
->msg_namelen
= addr_len
= 0;
1064 } else if (!up
->pending
) {
1065 if (sk
->sk_state
!= TCP_ESTABLISHED
)
1066 return -EDESTADDRREQ
;
1072 if (ipv6_addr_v4mapped(daddr
)) {
1073 struct sockaddr_in sin
;
1074 sin
.sin_family
= AF_INET
;
1075 sin
.sin_port
= sin6
? sin6
->sin6_port
: inet
->inet_dport
;
1076 sin
.sin_addr
.s_addr
= daddr
->s6_addr32
[3];
1077 msg
->msg_name
= &sin
;
1078 msg
->msg_namelen
= sizeof(sin
);
1080 if (__ipv6_only_sock(sk
))
1081 return -ENETUNREACH
;
1082 return udp_sendmsg(iocb
, sk
, msg
, len
);
1086 if (up
->pending
== AF_INET
)
1087 return udp_sendmsg(iocb
, sk
, msg
, len
);
1089 /* Rough check on arithmetic overflow,
1090 better check is made in ip6_append_data().
1092 if (len
> INT_MAX
- sizeof(struct udphdr
))
1097 * There are pending frames.
1098 * The socket lock must be held while it's corked.
1101 if (likely(up
->pending
)) {
1102 if (unlikely(up
->pending
!= AF_INET6
)) {
1104 return -EAFNOSUPPORT
;
1107 goto do_append_data
;
1111 ulen
+= sizeof(struct udphdr
);
1113 memset(&fl6
, 0, sizeof(fl6
));
1116 if (sin6
->sin6_port
== 0)
1119 fl6
.fl6_dport
= sin6
->sin6_port
;
1120 daddr
= &sin6
->sin6_addr
;
1123 fl6
.flowlabel
= sin6
->sin6_flowinfo
&IPV6_FLOWINFO_MASK
;
1124 if (fl6
.flowlabel
&IPV6_FLOWLABEL_MASK
) {
1125 flowlabel
= fl6_sock_lookup(sk
, fl6
.flowlabel
);
1126 if (flowlabel
== NULL
)
1128 daddr
= &flowlabel
->dst
;
1133 * Otherwise it will be difficult to maintain
1136 if (sk
->sk_state
== TCP_ESTABLISHED
&&
1137 ipv6_addr_equal(daddr
, &np
->daddr
))
1140 if (addr_len
>= sizeof(struct sockaddr_in6
) &&
1141 sin6
->sin6_scope_id
&&
1142 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr
)))
1143 fl6
.flowi6_oif
= sin6
->sin6_scope_id
;
1145 if (sk
->sk_state
!= TCP_ESTABLISHED
)
1146 return -EDESTADDRREQ
;
1148 fl6
.fl6_dport
= inet
->inet_dport
;
1150 fl6
.flowlabel
= np
->flow_label
;
1154 if (!fl6
.flowi6_oif
)
1155 fl6
.flowi6_oif
= sk
->sk_bound_dev_if
;
1157 if (!fl6
.flowi6_oif
)
1158 fl6
.flowi6_oif
= np
->sticky_pktinfo
.ipi6_ifindex
;
1160 fl6
.flowi6_mark
= sk
->sk_mark
;
1162 if (msg
->msg_controllen
) {
1164 memset(opt
, 0, sizeof(struct ipv6_txoptions
));
1165 opt
->tot_len
= sizeof(*opt
);
1167 err
= ip6_datagram_send_ctl(sock_net(sk
), sk
, msg
, &fl6
, opt
,
1168 &hlimit
, &tclass
, &dontfrag
);
1170 fl6_sock_release(flowlabel
);
1173 if ((fl6
.flowlabel
&IPV6_FLOWLABEL_MASK
) && !flowlabel
) {
1174 flowlabel
= fl6_sock_lookup(sk
, fl6
.flowlabel
);
1175 if (flowlabel
== NULL
)
1178 if (!(opt
->opt_nflen
|opt
->opt_flen
))
1185 opt
= fl6_merge_options(&opt_space
, flowlabel
, opt
);
1186 opt
= ipv6_fixup_options(&opt_space
, opt
);
1188 fl6
.flowi6_proto
= sk
->sk_protocol
;
1189 if (!ipv6_addr_any(daddr
))
1192 fl6
.daddr
.s6_addr
[15] = 0x1; /* :: means loopback (BSD'ism) */
1193 if (ipv6_addr_any(&fl6
.saddr
) && !ipv6_addr_any(&np
->saddr
))
1194 fl6
.saddr
= np
->saddr
;
1195 fl6
.fl6_sport
= inet
->inet_sport
;
1197 final_p
= fl6_update_dst(&fl6
, opt
, &final
);
1201 if (!fl6
.flowi6_oif
&& ipv6_addr_is_multicast(&fl6
.daddr
)) {
1202 fl6
.flowi6_oif
= np
->mcast_oif
;
1204 } else if (!fl6
.flowi6_oif
)
1205 fl6
.flowi6_oif
= np
->ucast_oif
;
1207 security_sk_classify_flow(sk
, flowi6_to_flowi(&fl6
));
1209 dst
= ip6_sk_dst_lookup_flow(sk
, &fl6
, final_p
, true);
1217 if (ipv6_addr_is_multicast(&fl6
.daddr
))
1218 hlimit
= np
->mcast_hops
;
1220 hlimit
= np
->hop_limit
;
1222 hlimit
= ip6_dst_hoplimit(dst
);
1226 tclass
= np
->tclass
;
1228 if (msg
->msg_flags
&MSG_CONFIRM
)
1233 if (unlikely(up
->pending
)) {
1234 /* The socket is already corked while preparing it. */
1235 /* ... which is an evident application bug. --ANK */
1238 LIMIT_NETDEBUG(KERN_DEBUG
"udp cork app bug 2\n");
1243 up
->pending
= AF_INET6
;
1247 dontfrag
= np
->dontfrag
;
1249 getfrag
= is_udplite
? udplite_getfrag
: ip_generic_getfrag
;
1250 err
= ip6_append_data(sk
, getfrag
, msg
->msg_iov
, ulen
,
1251 sizeof(struct udphdr
), hlimit
, tclass
, opt
, &fl6
,
1252 (struct rt6_info
*)dst
,
1253 corkreq
? msg
->msg_flags
|MSG_MORE
: msg
->msg_flags
, dontfrag
);
1255 udp_v6_flush_pending_frames(sk
);
1257 err
= udp_v6_push_pending_frames(sk
);
1258 else if (unlikely(skb_queue_empty(&sk
->sk_write_queue
)))
1263 ip6_dst_store(sk
, dst
,
1264 ipv6_addr_equal(&fl6
.daddr
, &np
->daddr
) ?
1266 #ifdef CONFIG_IPV6_SUBTREES
1267 ipv6_addr_equal(&fl6
.saddr
, &np
->saddr
) ?
1278 err
= np
->recverr
? net_xmit_errno(err
) : 0;
1282 fl6_sock_release(flowlabel
);
1286 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
1287 * ENOBUFS might not be good (it's not tunable per se), but otherwise
1288 * we don't have a good statistic (IpOutDiscards but it can be too many
1289 * things). We could add another new stat but at least for now that
1290 * seems like overkill.
1292 if (err
== -ENOBUFS
|| test_bit(SOCK_NOSPACE
, &sk
->sk_socket
->flags
)) {
1293 UDP6_INC_STATS_USER(sock_net(sk
),
1294 UDP_MIB_SNDBUFERRORS
, is_udplite
);
1300 if (!(msg
->msg_flags
&MSG_PROBE
) || len
)
1301 goto back_from_confirm
;
1306 void udpv6_destroy_sock(struct sock
*sk
)
1308 struct udp_sock
*up
= udp_sk(sk
);
1310 udp_v6_flush_pending_frames(sk
);
1313 if (static_key_false(&udpv6_encap_needed
) && up
->encap_type
) {
1314 void (*encap_destroy
)(struct sock
*sk
);
1315 encap_destroy
= ACCESS_ONCE(up
->encap_destroy
);
1320 inet6_destroy_sock(sk
);
1324 * Socket option code for UDP
1326 int udpv6_setsockopt(struct sock
*sk
, int level
, int optname
,
1327 char __user
*optval
, unsigned int optlen
)
1329 if (level
== SOL_UDP
|| level
== SOL_UDPLITE
)
1330 return udp_lib_setsockopt(sk
, level
, optname
, optval
, optlen
,
1331 udp_v6_push_pending_frames
);
1332 return ipv6_setsockopt(sk
, level
, optname
, optval
, optlen
);
1335 #ifdef CONFIG_COMPAT
1336 int compat_udpv6_setsockopt(struct sock
*sk
, int level
, int optname
,
1337 char __user
*optval
, unsigned int optlen
)
1339 if (level
== SOL_UDP
|| level
== SOL_UDPLITE
)
1340 return udp_lib_setsockopt(sk
, level
, optname
, optval
, optlen
,
1341 udp_v6_push_pending_frames
);
1342 return compat_ipv6_setsockopt(sk
, level
, optname
, optval
, optlen
);
1346 int udpv6_getsockopt(struct sock
*sk
, int level
, int optname
,
1347 char __user
*optval
, int __user
*optlen
)
1349 if (level
== SOL_UDP
|| level
== SOL_UDPLITE
)
1350 return udp_lib_getsockopt(sk
, level
, optname
, optval
, optlen
);
1351 return ipv6_getsockopt(sk
, level
, optname
, optval
, optlen
);
1354 #ifdef CONFIG_COMPAT
1355 int compat_udpv6_getsockopt(struct sock
*sk
, int level
, int optname
,
1356 char __user
*optval
, int __user
*optlen
)
1358 if (level
== SOL_UDP
|| level
== SOL_UDPLITE
)
1359 return udp_lib_getsockopt(sk
, level
, optname
, optval
, optlen
);
1360 return compat_ipv6_getsockopt(sk
, level
, optname
, optval
, optlen
);
1364 static const struct inet6_protocol udpv6_protocol
= {
1365 .handler
= udpv6_rcv
,
1366 .err_handler
= udpv6_err
,
1367 .flags
= INET6_PROTO_NOPOLICY
|INET6_PROTO_FINAL
,
1370 /* ------------------------------------------------------------------------ */
1371 #ifdef CONFIG_PROC_FS
1372 int udp6_seq_show(struct seq_file
*seq
, void *v
)
1374 if (v
== SEQ_START_TOKEN
) {
1375 seq_puts(seq
, IPV6_SEQ_DGRAM_HEADER
);
1377 int bucket
= ((struct udp_iter_state
*)seq
->private)->bucket
;
1378 struct inet_sock
*inet
= inet_sk(v
);
1379 __u16 srcp
= ntohs(inet
->inet_sport
);
1380 __u16 destp
= ntohs(inet
->inet_dport
);
1381 ip6_dgram_sock_seq_show(seq
, v
, srcp
, destp
, bucket
);
1386 static const struct file_operations udp6_afinfo_seq_fops
= {
1387 .owner
= THIS_MODULE
,
1388 .open
= udp_seq_open
,
1390 .llseek
= seq_lseek
,
1391 .release
= seq_release_net
1394 static struct udp_seq_afinfo udp6_seq_afinfo
= {
1397 .udp_table
= &udp_table
,
1398 .seq_fops
= &udp6_afinfo_seq_fops
,
1400 .show
= udp6_seq_show
,
1404 int __net_init
udp6_proc_init(struct net
*net
)
1406 return udp_proc_register(net
, &udp6_seq_afinfo
);
1409 void udp6_proc_exit(struct net
*net
) {
1410 udp_proc_unregister(net
, &udp6_seq_afinfo
);
1412 #endif /* CONFIG_PROC_FS */
1414 void udp_v6_clear_sk(struct sock
*sk
, int size
)
1416 struct inet_sock
*inet
= inet_sk(sk
);
1418 /* we do not want to clear pinet6 field, because of RCU lookups */
1419 sk_prot_clear_portaddr_nulls(sk
, offsetof(struct inet_sock
, pinet6
));
1421 size
-= offsetof(struct inet_sock
, pinet6
) + sizeof(inet
->pinet6
);
1422 memset(&inet
->pinet6
+ 1, 0, size
);
1425 /* ------------------------------------------------------------------------ */
1427 struct proto udpv6_prot
= {
1429 .owner
= THIS_MODULE
,
1430 .close
= udp_lib_close
,
1431 .connect
= ip6_datagram_connect
,
1432 .disconnect
= udp_disconnect
,
1434 .destroy
= udpv6_destroy_sock
,
1435 .setsockopt
= udpv6_setsockopt
,
1436 .getsockopt
= udpv6_getsockopt
,
1437 .sendmsg
= udpv6_sendmsg
,
1438 .recvmsg
= udpv6_recvmsg
,
1439 .backlog_rcv
= __udpv6_queue_rcv_skb
,
1440 .hash
= udp_lib_hash
,
1441 .unhash
= udp_lib_unhash
,
1442 .rehash
= udp_v6_rehash
,
1443 .get_port
= udp_v6_get_port
,
1444 .memory_allocated
= &udp_memory_allocated
,
1445 .sysctl_mem
= sysctl_udp_mem
,
1446 .sysctl_wmem
= &sysctl_udp_wmem_min
,
1447 .sysctl_rmem
= &sysctl_udp_rmem_min
,
1448 .obj_size
= sizeof(struct udp6_sock
),
1449 .slab_flags
= SLAB_DESTROY_BY_RCU
,
1450 .h
.udp_table
= &udp_table
,
1451 #ifdef CONFIG_COMPAT
1452 .compat_setsockopt
= compat_udpv6_setsockopt
,
1453 .compat_getsockopt
= compat_udpv6_getsockopt
,
1455 .clear_sk
= udp_v6_clear_sk
,
1458 static struct inet_protosw udpv6_protosw
= {
1460 .protocol
= IPPROTO_UDP
,
1461 .prot
= &udpv6_prot
,
1462 .ops
= &inet6_dgram_ops
,
1463 .no_check
= UDP_CSUM_DEFAULT
,
1464 .flags
= INET_PROTOSW_PERMANENT
,
1468 int __init
udpv6_init(void)
1472 ret
= inet6_add_protocol(&udpv6_protocol
, IPPROTO_UDP
);
1476 ret
= inet6_register_protosw(&udpv6_protosw
);
1478 goto out_udpv6_protocol
;
1483 inet6_del_protocol(&udpv6_protocol
, IPPROTO_UDP
);
1487 void udpv6_exit(void)
1489 inet6_unregister_protosw(&udpv6_protosw
);
1490 inet6_del_protocol(&udpv6_protocol
, IPPROTO_UDP
);