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 <asm/uaccess.h>
39 #include <net/ndisc.h>
40 #include <net/protocol.h>
41 #include <net/transp_v6.h>
42 #include <net/ip6_route.h>
44 #include <net/tcp_states.h>
45 #include <net/ip6_checksum.h>
48 #include <linux/proc_fs.h>
49 #include <linux/seq_file.h>
52 int ipv6_rcv_saddr_equal(const struct sock
*sk
, const struct sock
*sk2
)
54 const struct in6_addr
*sk_rcv_saddr6
= &inet6_sk(sk
)->rcv_saddr
;
55 const struct in6_addr
*sk2_rcv_saddr6
= inet6_rcv_saddr(sk2
);
56 __be32 sk1_rcv_saddr
= inet_sk(sk
)->inet_rcv_saddr
;
57 __be32 sk2_rcv_saddr
= inet_rcv_saddr(sk2
);
58 int sk_ipv6only
= ipv6_only_sock(sk
);
59 int sk2_ipv6only
= inet_v6_ipv6only(sk2
);
60 int addr_type
= ipv6_addr_type(sk_rcv_saddr6
);
61 int addr_type2
= sk2_rcv_saddr6
? ipv6_addr_type(sk2_rcv_saddr6
) : IPV6_ADDR_MAPPED
;
63 /* if both are mapped, treat as IPv4 */
64 if (addr_type
== IPV6_ADDR_MAPPED
&& addr_type2
== IPV6_ADDR_MAPPED
)
65 return (!sk2_ipv6only
&&
66 (!sk1_rcv_saddr
|| !sk2_rcv_saddr
||
67 sk1_rcv_saddr
== sk2_rcv_saddr
));
69 if (addr_type2
== IPV6_ADDR_ANY
&&
70 !(sk2_ipv6only
&& addr_type
== IPV6_ADDR_MAPPED
))
73 if (addr_type
== IPV6_ADDR_ANY
&&
74 !(sk_ipv6only
&& addr_type2
== IPV6_ADDR_MAPPED
))
78 ipv6_addr_equal(sk_rcv_saddr6
, sk2_rcv_saddr6
))
84 static unsigned int udp6_portaddr_hash(struct net
*net
,
85 const struct in6_addr
*addr6
,
88 unsigned int hash
, mix
= net_hash_mix(net
);
90 if (ipv6_addr_any(addr6
))
91 hash
= jhash_1word(0, mix
);
92 else if (ipv6_addr_v4mapped(addr6
))
93 hash
= jhash_1word(addr6
->s6_addr32
[3], mix
);
95 hash
= jhash2(addr6
->s6_addr32
, 4, mix
);
101 int udp_v6_get_port(struct sock
*sk
, unsigned short snum
)
103 unsigned int hash2_nulladdr
=
104 udp6_portaddr_hash(sock_net(sk
), &in6addr_any
, snum
);
105 unsigned int hash2_partial
=
106 udp6_portaddr_hash(sock_net(sk
), &inet6_sk(sk
)->rcv_saddr
, 0);
108 /* precompute partial secondary hash */
109 udp_sk(sk
)->udp_portaddr_hash
= hash2_partial
;
110 return udp_lib_get_port(sk
, snum
, ipv6_rcv_saddr_equal
, hash2_nulladdr
);
113 static inline int compute_score(struct sock
*sk
, struct net
*net
,
115 struct in6_addr
*saddr
, __be16 sport
,
116 struct in6_addr
*daddr
, __be16 dport
,
121 if (net_eq(sock_net(sk
), net
) && udp_sk(sk
)->udp_port_hash
== hnum
&&
122 sk
->sk_family
== PF_INET6
) {
123 struct ipv6_pinfo
*np
= inet6_sk(sk
);
124 struct inet_sock
*inet
= inet_sk(sk
);
127 if (inet
->inet_dport
) {
128 if (inet
->inet_dport
!= sport
)
132 if (!ipv6_addr_any(&np
->rcv_saddr
)) {
133 if (!ipv6_addr_equal(&np
->rcv_saddr
, daddr
))
137 if (!ipv6_addr_any(&np
->daddr
)) {
138 if (!ipv6_addr_equal(&np
->daddr
, saddr
))
142 if (sk
->sk_bound_dev_if
) {
143 if (sk
->sk_bound_dev_if
!= dif
)
151 #define SCORE2_MAX (1 + 1 + 1)
152 static inline int compute_score2(struct sock
*sk
, struct net
*net
,
153 const struct in6_addr
*saddr
, __be16 sport
,
154 const struct in6_addr
*daddr
, unsigned short hnum
,
159 if (net_eq(sock_net(sk
), net
) && udp_sk(sk
)->udp_port_hash
== hnum
&&
160 sk
->sk_family
== PF_INET6
) {
161 struct ipv6_pinfo
*np
= inet6_sk(sk
);
162 struct inet_sock
*inet
= inet_sk(sk
);
164 if (!ipv6_addr_equal(&np
->rcv_saddr
, daddr
))
167 if (inet
->inet_dport
) {
168 if (inet
->inet_dport
!= sport
)
172 if (!ipv6_addr_any(&np
->daddr
)) {
173 if (!ipv6_addr_equal(&np
->daddr
, saddr
))
177 if (sk
->sk_bound_dev_if
) {
178 if (sk
->sk_bound_dev_if
!= dif
)
187 /* called with read_rcu_lock() */
188 static struct sock
*udp6_lib_lookup2(struct net
*net
,
189 const struct in6_addr
*saddr
, __be16 sport
,
190 const struct in6_addr
*daddr
, unsigned int hnum
, int dif
,
191 struct udp_hslot
*hslot2
, unsigned int slot2
)
193 struct sock
*sk
, *result
;
194 struct hlist_nulls_node
*node
;
200 udp_portaddr_for_each_entry_rcu(sk
, node
, &hslot2
->head
) {
201 score
= compute_score2(sk
, net
, saddr
, sport
,
203 if (score
> badness
) {
206 if (score
== SCORE2_MAX
)
211 * if the nulls value we got at the end of this lookup is
212 * not the expected one, we must restart lookup.
213 * We probably met an item that was moved to another chain.
215 if (get_nulls_value(node
) != slot2
)
220 if (unlikely(!atomic_inc_not_zero(&result
->sk_refcnt
)))
222 else if (unlikely(compute_score2(result
, net
, saddr
, sport
,
223 daddr
, hnum
, dif
) < badness
)) {
231 static struct sock
*__udp6_lib_lookup(struct net
*net
,
232 struct in6_addr
*saddr
, __be16 sport
,
233 struct in6_addr
*daddr
, __be16 dport
,
234 int dif
, struct udp_table
*udptable
)
236 struct sock
*sk
, *result
;
237 struct hlist_nulls_node
*node
;
238 unsigned short hnum
= ntohs(dport
);
239 unsigned int hash2
, slot2
, slot
= udp_hashfn(net
, hnum
, udptable
->mask
);
240 struct udp_hslot
*hslot2
, *hslot
= &udptable
->hash
[slot
];
244 if (hslot
->count
> 10) {
245 hash2
= udp6_portaddr_hash(net
, daddr
, hnum
);
246 slot2
= hash2
& udptable
->mask
;
247 hslot2
= &udptable
->hash2
[slot2
];
248 if (hslot
->count
< hslot2
->count
)
251 result
= udp6_lib_lookup2(net
, saddr
, sport
,
255 hash2
= udp6_portaddr_hash(net
, &in6addr_any
, hnum
);
256 slot2
= hash2
& udptable
->mask
;
257 hslot2
= &udptable
->hash2
[slot2
];
258 if (hslot
->count
< hslot2
->count
)
261 result
= udp6_lib_lookup2(net
, &in6addr_any
, sport
,
271 sk_nulls_for_each_rcu(sk
, node
, &hslot
->head
) {
272 score
= compute_score(sk
, net
, hnum
, saddr
, sport
, daddr
, dport
, dif
);
273 if (score
> badness
) {
279 * if the nulls value we got at the end of this lookup is
280 * not the expected one, we must restart lookup.
281 * We probably met an item that was moved to another chain.
283 if (get_nulls_value(node
) != slot
)
287 if (unlikely(!atomic_inc_not_zero(&result
->sk_refcnt
)))
289 else if (unlikely(compute_score(result
, net
, hnum
, saddr
, sport
,
290 daddr
, dport
, dif
) < badness
)) {
299 static struct sock
*__udp6_lib_lookup_skb(struct sk_buff
*skb
,
300 __be16 sport
, __be16 dport
,
301 struct udp_table
*udptable
)
304 struct ipv6hdr
*iph
= ipv6_hdr(skb
);
306 if (unlikely(sk
= skb_steal_sock(skb
)))
308 return __udp6_lib_lookup(dev_net(skb_dst(skb
)->dev
), &iph
->saddr
, sport
,
309 &iph
->daddr
, dport
, inet6_iif(skb
),
314 * This should be easy, if there is something there we
315 * return it, otherwise we block.
318 int udpv6_recvmsg(struct kiocb
*iocb
, struct sock
*sk
,
319 struct msghdr
*msg
, size_t len
,
320 int noblock
, int flags
, int *addr_len
)
322 struct ipv6_pinfo
*np
= inet6_sk(sk
);
323 struct inet_sock
*inet
= inet_sk(sk
);
328 int is_udplite
= IS_UDPLITE(sk
);
332 *addr_len
=sizeof(struct sockaddr_in6
);
334 if (flags
& MSG_ERRQUEUE
)
335 return ipv6_recv_error(sk
, msg
, len
);
338 skb
= __skb_recv_datagram(sk
, flags
| (noblock
? MSG_DONTWAIT
: 0),
343 ulen
= skb
->len
- sizeof(struct udphdr
);
347 msg
->msg_flags
|= MSG_TRUNC
;
349 is_udp4
= (skb
->protocol
== htons(ETH_P_IP
));
352 * If checksum is needed at all, try to do it while copying the
353 * data. If the data is truncated, or if we only want a partial
354 * coverage checksum (UDP-Lite), do it before the copy.
357 if (len
< ulen
|| UDP_SKB_CB(skb
)->partial_cov
) {
358 if (udp_lib_checksum_complete(skb
))
362 if (skb_csum_unnecessary(skb
))
363 err
= skb_copy_datagram_iovec(skb
, sizeof(struct udphdr
),
366 err
= skb_copy_and_csum_datagram_iovec(skb
, sizeof(struct udphdr
), msg
->msg_iov
);
375 UDP_INC_STATS_USER(sock_net(sk
),
376 UDP_MIB_INDATAGRAMS
, is_udplite
);
378 UDP6_INC_STATS_USER(sock_net(sk
),
379 UDP_MIB_INDATAGRAMS
, is_udplite
);
382 sock_recv_ts_and_drops(msg
, sk
, skb
);
384 /* Copy the address. */
386 struct sockaddr_in6
*sin6
;
388 sin6
= (struct sockaddr_in6
*) msg
->msg_name
;
389 sin6
->sin6_family
= AF_INET6
;
390 sin6
->sin6_port
= udp_hdr(skb
)->source
;
391 sin6
->sin6_flowinfo
= 0;
392 sin6
->sin6_scope_id
= 0;
395 ipv6_addr_set_v4mapped(ip_hdr(skb
)->saddr
,
398 ipv6_addr_copy(&sin6
->sin6_addr
,
399 &ipv6_hdr(skb
)->saddr
);
400 if (ipv6_addr_type(&sin6
->sin6_addr
) & IPV6_ADDR_LINKLOCAL
)
401 sin6
->sin6_scope_id
= IP6CB(skb
)->iif
;
406 if (inet
->cmsg_flags
)
407 ip_cmsg_recv(msg
, skb
);
410 datagram_recv_ctl(sk
, msg
, skb
);
414 if (flags
& MSG_TRUNC
)
418 skb_free_datagram_locked(sk
, skb
);
424 if (!skb_kill_datagram(sk
, skb
, flags
)) {
426 UDP_INC_STATS_USER(sock_net(sk
),
427 UDP_MIB_INERRORS
, is_udplite
);
429 UDP6_INC_STATS_USER(sock_net(sk
),
430 UDP_MIB_INERRORS
, is_udplite
);
434 if (flags
& MSG_DONTWAIT
)
439 void __udp6_lib_err(struct sk_buff
*skb
, struct inet6_skb_parm
*opt
,
440 u8 type
, u8 code
, int offset
, __be32 info
,
441 struct udp_table
*udptable
)
443 struct ipv6_pinfo
*np
;
444 struct ipv6hdr
*hdr
= (struct ipv6hdr
*)skb
->data
;
445 struct in6_addr
*saddr
= &hdr
->saddr
;
446 struct in6_addr
*daddr
= &hdr
->daddr
;
447 struct udphdr
*uh
= (struct udphdr
*)(skb
->data
+offset
);
451 sk
= __udp6_lib_lookup(dev_net(skb
->dev
), daddr
, uh
->dest
,
452 saddr
, uh
->source
, inet6_iif(skb
), udptable
);
458 if (!icmpv6_err_convert(type
, code
, &err
) && !np
->recverr
)
461 if (sk
->sk_state
!= TCP_ESTABLISHED
&& !np
->recverr
)
465 ipv6_icmp_error(sk
, skb
, err
, uh
->dest
, ntohl(info
), (u8
*)(uh
+1));
468 sk
->sk_error_report(sk
);
473 static __inline__
void udpv6_err(struct sk_buff
*skb
,
474 struct inet6_skb_parm
*opt
, u8 type
,
475 u8 code
, int offset
, __be32 info
)
477 __udp6_lib_err(skb
, opt
, type
, code
, offset
, info
, &udp_table
);
480 int udpv6_queue_rcv_skb(struct sock
* sk
, struct sk_buff
*skb
)
482 struct udp_sock
*up
= udp_sk(sk
);
484 int is_udplite
= IS_UDPLITE(sk
);
486 if (!xfrm6_policy_check(sk
, XFRM_POLICY_IN
, skb
))
490 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
492 if ((is_udplite
& UDPLITE_RECV_CC
) && UDP_SKB_CB(skb
)->partial_cov
) {
494 if (up
->pcrlen
== 0) { /* full coverage was set */
495 LIMIT_NETDEBUG(KERN_WARNING
"UDPLITE6: partial coverage"
496 " %d while full coverage %d requested\n",
497 UDP_SKB_CB(skb
)->cscov
, skb
->len
);
500 if (UDP_SKB_CB(skb
)->cscov
< up
->pcrlen
) {
501 LIMIT_NETDEBUG(KERN_WARNING
"UDPLITE6: coverage %d "
502 "too small, need min %d\n",
503 UDP_SKB_CB(skb
)->cscov
, up
->pcrlen
);
509 if (udp_lib_checksum_complete(skb
))
513 if ((rc
= sock_queue_rcv_skb(sk
, skb
)) < 0) {
514 /* Note that an ENOMEM error is charged twice */
516 UDP6_INC_STATS_BH(sock_net(sk
),
517 UDP_MIB_RCVBUFERRORS
, is_udplite
);
518 goto drop_no_sk_drops_inc
;
523 atomic_inc(&sk
->sk_drops
);
524 drop_no_sk_drops_inc
:
525 UDP6_INC_STATS_BH(sock_net(sk
), UDP_MIB_INERRORS
, is_udplite
);
530 static struct sock
*udp_v6_mcast_next(struct net
*net
, struct sock
*sk
,
531 __be16 loc_port
, struct in6_addr
*loc_addr
,
532 __be16 rmt_port
, struct in6_addr
*rmt_addr
,
535 struct hlist_nulls_node
*node
;
537 unsigned short num
= ntohs(loc_port
);
539 sk_nulls_for_each_from(s
, node
) {
540 struct inet_sock
*inet
= inet_sk(s
);
542 if (!net_eq(sock_net(s
), net
))
545 if (udp_sk(s
)->udp_port_hash
== num
&&
546 s
->sk_family
== PF_INET6
) {
547 struct ipv6_pinfo
*np
= inet6_sk(s
);
548 if (inet
->inet_dport
) {
549 if (inet
->inet_dport
!= rmt_port
)
552 if (!ipv6_addr_any(&np
->daddr
) &&
553 !ipv6_addr_equal(&np
->daddr
, rmt_addr
))
556 if (s
->sk_bound_dev_if
&& s
->sk_bound_dev_if
!= dif
)
559 if (!ipv6_addr_any(&np
->rcv_saddr
)) {
560 if (!ipv6_addr_equal(&np
->rcv_saddr
, loc_addr
))
563 if (!inet6_mc_check(s
, loc_addr
, rmt_addr
))
571 static void flush_stack(struct sock
**stack
, unsigned int count
,
572 struct sk_buff
*skb
, unsigned int final
)
576 struct sk_buff
*skb1
;
578 for (i
= 0; i
< count
; i
++) {
579 skb1
= (i
== final
) ? skb
: skb_clone(skb
, GFP_ATOMIC
);
584 if (!sock_owned_by_user(sk
))
585 udpv6_queue_rcv_skb(sk
, skb1
);
587 sk_add_backlog(sk
, skb1
);
590 atomic_inc(&sk
->sk_drops
);
591 UDP6_INC_STATS_BH(sock_net(sk
),
592 UDP_MIB_RCVBUFERRORS
, IS_UDPLITE(sk
));
593 UDP6_INC_STATS_BH(sock_net(sk
),
594 UDP_MIB_INERRORS
, IS_UDPLITE(sk
));
599 * Note: called only from the BH handler context,
600 * so we don't need to lock the hashes.
602 static int __udp6_lib_mcast_deliver(struct net
*net
, struct sk_buff
*skb
,
603 struct in6_addr
*saddr
, struct in6_addr
*daddr
,
604 struct udp_table
*udptable
)
606 struct sock
*sk
, *stack
[256 / sizeof(struct sock
*)];
607 const struct udphdr
*uh
= udp_hdr(skb
);
608 struct udp_hslot
*hslot
= udp_hashslot(udptable
, net
, ntohs(uh
->dest
));
610 unsigned int i
, count
= 0;
612 spin_lock(&hslot
->lock
);
613 sk
= sk_nulls_head(&hslot
->head
);
614 dif
= inet6_iif(skb
);
615 sk
= udp_v6_mcast_next(net
, sk
, uh
->dest
, daddr
, uh
->source
, saddr
, dif
);
618 sk
= udp_v6_mcast_next(net
, sk_nulls_next(sk
), uh
->dest
, daddr
,
619 uh
->source
, saddr
, dif
);
620 if (unlikely(count
== ARRAY_SIZE(stack
))) {
623 flush_stack(stack
, count
, skb
, ~0);
628 * before releasing the lock, we must take reference on sockets
630 for (i
= 0; i
< count
; i
++)
633 spin_unlock(&hslot
->lock
);
636 flush_stack(stack
, count
, skb
, count
- 1);
638 for (i
= 0; i
< count
; i
++)
646 static inline int udp6_csum_init(struct sk_buff
*skb
, struct udphdr
*uh
,
651 UDP_SKB_CB(skb
)->partial_cov
= 0;
652 UDP_SKB_CB(skb
)->cscov
= skb
->len
;
654 if (proto
== IPPROTO_UDPLITE
) {
655 err
= udplite_checksum_init(skb
, uh
);
660 if (uh
->check
== 0) {
661 /* RFC 2460 section 8.1 says that we SHOULD log
662 this error. Well, it is reasonable.
664 LIMIT_NETDEBUG(KERN_INFO
"IPv6: udp checksum is 0\n");
667 if (skb
->ip_summed
== CHECKSUM_COMPLETE
&&
668 !csum_ipv6_magic(&ipv6_hdr(skb
)->saddr
, &ipv6_hdr(skb
)->daddr
,
669 skb
->len
, proto
, skb
->csum
))
670 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
672 if (!skb_csum_unnecessary(skb
))
673 skb
->csum
= ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb
)->saddr
,
674 &ipv6_hdr(skb
)->daddr
,
675 skb
->len
, proto
, 0));
680 int __udp6_lib_rcv(struct sk_buff
*skb
, struct udp_table
*udptable
,
683 struct net
*net
= dev_net(skb
->dev
);
686 struct in6_addr
*saddr
, *daddr
;
689 if (!pskb_may_pull(skb
, sizeof(struct udphdr
)))
692 saddr
= &ipv6_hdr(skb
)->saddr
;
693 daddr
= &ipv6_hdr(skb
)->daddr
;
696 ulen
= ntohs(uh
->len
);
700 if (proto
== IPPROTO_UDP
) {
701 /* UDP validates ulen. */
703 /* Check for jumbo payload */
707 if (ulen
< sizeof(*uh
))
710 if (ulen
< skb
->len
) {
711 if (pskb_trim_rcsum(skb
, ulen
))
713 saddr
= &ipv6_hdr(skb
)->saddr
;
714 daddr
= &ipv6_hdr(skb
)->daddr
;
719 if (udp6_csum_init(skb
, uh
, proto
))
723 * Multicast receive code
725 if (ipv6_addr_is_multicast(daddr
))
726 return __udp6_lib_mcast_deliver(net
, skb
,
727 saddr
, daddr
, udptable
);
732 * check socket cache ... must talk to Alan about his plans
733 * for sock caches... i'll skip this for now.
735 sk
= __udp6_lib_lookup_skb(skb
, uh
->source
, uh
->dest
, udptable
);
738 if (!xfrm6_policy_check(NULL
, XFRM_POLICY_IN
, skb
))
741 if (udp_lib_checksum_complete(skb
))
743 UDP6_INC_STATS_BH(net
, UDP_MIB_NOPORTS
,
744 proto
== IPPROTO_UDPLITE
);
746 icmpv6_send(skb
, ICMPV6_DEST_UNREACH
, ICMPV6_PORT_UNREACH
, 0);
755 if (!sock_owned_by_user(sk
))
756 udpv6_queue_rcv_skb(sk
, skb
);
758 sk_add_backlog(sk
, skb
);
764 LIMIT_NETDEBUG(KERN_DEBUG
"UDP%sv6: short packet: %d/%u\n",
765 proto
== IPPROTO_UDPLITE
? "-Lite" : "",
769 UDP6_INC_STATS_BH(net
, UDP_MIB_INERRORS
, proto
== IPPROTO_UDPLITE
);
774 static __inline__
int udpv6_rcv(struct sk_buff
*skb
)
776 return __udp6_lib_rcv(skb
, &udp_table
, IPPROTO_UDP
);
780 * Throw away all pending data and cancel the corking. Socket is locked.
782 static void udp_v6_flush_pending_frames(struct sock
*sk
)
784 struct udp_sock
*up
= udp_sk(sk
);
786 if (up
->pending
== AF_INET
)
787 udp_flush_pending_frames(sk
);
788 else if (up
->pending
) {
791 ip6_flush_pending_frames(sk
);
796 * udp6_hwcsum_outgoing - handle outgoing HW checksumming
797 * @sk: socket we are sending on
798 * @skb: sk_buff containing the filled-in UDP header
799 * (checksum field must be zeroed out)
801 static void udp6_hwcsum_outgoing(struct sock
*sk
, struct sk_buff
*skb
,
802 const struct in6_addr
*saddr
,
803 const struct in6_addr
*daddr
, int len
)
806 struct udphdr
*uh
= udp_hdr(skb
);
809 if (skb_queue_len(&sk
->sk_write_queue
) == 1) {
810 /* Only one fragment on the socket. */
811 skb
->csum_start
= skb_transport_header(skb
) - skb
->head
;
812 skb
->csum_offset
= offsetof(struct udphdr
, check
);
813 uh
->check
= ~csum_ipv6_magic(saddr
, daddr
, len
, IPPROTO_UDP
, 0);
816 * HW-checksum won't work as there are two or more
817 * fragments on the socket so that all csums of sk_buffs
820 offset
= skb_transport_offset(skb
);
821 skb
->csum
= skb_checksum(skb
, offset
, skb
->len
- offset
, 0);
823 skb
->ip_summed
= CHECKSUM_NONE
;
825 skb_queue_walk(&sk
->sk_write_queue
, skb
) {
826 csum
= csum_add(csum
, skb
->csum
);
829 uh
->check
= csum_ipv6_magic(saddr
, daddr
, len
, IPPROTO_UDP
,
832 uh
->check
= CSUM_MANGLED_0
;
840 static int udp_v6_push_pending_frames(struct sock
*sk
)
844 struct udp_sock
*up
= udp_sk(sk
);
845 struct inet_sock
*inet
= inet_sk(sk
);
846 struct flowi
*fl
= &inet
->cork
.fl
;
848 int is_udplite
= IS_UDPLITE(sk
);
851 /* Grab the skbuff where UDP header space exists. */
852 if ((skb
= skb_peek(&sk
->sk_write_queue
)) == NULL
)
856 * Create a UDP header
859 uh
->source
= fl
->fl_ip_sport
;
860 uh
->dest
= fl
->fl_ip_dport
;
861 uh
->len
= htons(up
->len
);
865 csum
= udplite_csum_outgoing(sk
, skb
);
866 else if (skb
->ip_summed
== CHECKSUM_PARTIAL
) { /* UDP hardware csum */
867 udp6_hwcsum_outgoing(sk
, skb
, &fl
->fl6_src
, &fl
->fl6_dst
,
871 csum
= udp_csum_outgoing(sk
, skb
);
873 /* add protocol-dependent pseudo-header */
874 uh
->check
= csum_ipv6_magic(&fl
->fl6_src
, &fl
->fl6_dst
,
875 up
->len
, fl
->proto
, csum
);
877 uh
->check
= CSUM_MANGLED_0
;
880 err
= ip6_push_pending_frames(sk
);
882 if (err
== -ENOBUFS
&& !inet6_sk(sk
)->recverr
) {
883 UDP6_INC_STATS_USER(sock_net(sk
),
884 UDP_MIB_SNDBUFERRORS
, is_udplite
);
888 UDP6_INC_STATS_USER(sock_net(sk
),
889 UDP_MIB_OUTDATAGRAMS
, is_udplite
);
896 int udpv6_sendmsg(struct kiocb
*iocb
, struct sock
*sk
,
897 struct msghdr
*msg
, size_t len
)
899 struct ipv6_txoptions opt_space
;
900 struct udp_sock
*up
= udp_sk(sk
);
901 struct inet_sock
*inet
= inet_sk(sk
);
902 struct ipv6_pinfo
*np
= inet6_sk(sk
);
903 struct sockaddr_in6
*sin6
= (struct sockaddr_in6
*) msg
->msg_name
;
904 struct in6_addr
*daddr
, *final_p
= NULL
, final
;
905 struct ipv6_txoptions
*opt
= NULL
;
906 struct ip6_flowlabel
*flowlabel
= NULL
;
908 struct dst_entry
*dst
;
909 int addr_len
= msg
->msg_namelen
;
913 int corkreq
= up
->corkflag
|| msg
->msg_flags
&MSG_MORE
;
916 int is_udplite
= IS_UDPLITE(sk
);
917 int (*getfrag
)(void *, char *, int, int, int, struct sk_buff
*);
919 /* destination address check */
921 if (addr_len
< offsetof(struct sockaddr
, sa_data
))
924 switch (sin6
->sin6_family
) {
926 if (addr_len
< SIN6_LEN_RFC2133
)
928 daddr
= &sin6
->sin6_addr
;
933 msg
->msg_name
= sin6
= NULL
;
934 msg
->msg_namelen
= addr_len
= 0;
940 } else if (!up
->pending
) {
941 if (sk
->sk_state
!= TCP_ESTABLISHED
)
942 return -EDESTADDRREQ
;
948 if (ipv6_addr_v4mapped(daddr
)) {
949 struct sockaddr_in sin
;
950 sin
.sin_family
= AF_INET
;
951 sin
.sin_port
= sin6
? sin6
->sin6_port
: inet
->inet_dport
;
952 sin
.sin_addr
.s_addr
= daddr
->s6_addr32
[3];
953 msg
->msg_name
= &sin
;
954 msg
->msg_namelen
= sizeof(sin
);
956 if (__ipv6_only_sock(sk
))
958 return udp_sendmsg(iocb
, sk
, msg
, len
);
962 if (up
->pending
== AF_INET
)
963 return udp_sendmsg(iocb
, sk
, msg
, len
);
965 /* Rough check on arithmetic overflow,
966 better check is made in ip6_append_data().
968 if (len
> INT_MAX
- sizeof(struct udphdr
))
973 * There are pending frames.
974 * The socket lock must be held while it's corked.
977 if (likely(up
->pending
)) {
978 if (unlikely(up
->pending
!= AF_INET6
)) {
980 return -EAFNOSUPPORT
;
987 ulen
+= sizeof(struct udphdr
);
989 memset(&fl
, 0, sizeof(fl
));
992 if (sin6
->sin6_port
== 0)
995 fl
.fl_ip_dport
= sin6
->sin6_port
;
996 daddr
= &sin6
->sin6_addr
;
999 fl
.fl6_flowlabel
= sin6
->sin6_flowinfo
&IPV6_FLOWINFO_MASK
;
1000 if (fl
.fl6_flowlabel
&IPV6_FLOWLABEL_MASK
) {
1001 flowlabel
= fl6_sock_lookup(sk
, fl
.fl6_flowlabel
);
1002 if (flowlabel
== NULL
)
1004 daddr
= &flowlabel
->dst
;
1009 * Otherwise it will be difficult to maintain
1012 if (sk
->sk_state
== TCP_ESTABLISHED
&&
1013 ipv6_addr_equal(daddr
, &np
->daddr
))
1016 if (addr_len
>= sizeof(struct sockaddr_in6
) &&
1017 sin6
->sin6_scope_id
&&
1018 ipv6_addr_type(daddr
)&IPV6_ADDR_LINKLOCAL
)
1019 fl
.oif
= sin6
->sin6_scope_id
;
1021 if (sk
->sk_state
!= TCP_ESTABLISHED
)
1022 return -EDESTADDRREQ
;
1024 fl
.fl_ip_dport
= inet
->inet_dport
;
1026 fl
.fl6_flowlabel
= np
->flow_label
;
1031 fl
.oif
= sk
->sk_bound_dev_if
;
1034 fl
.oif
= np
->sticky_pktinfo
.ipi6_ifindex
;
1036 fl
.mark
= sk
->sk_mark
;
1038 if (msg
->msg_controllen
) {
1040 memset(opt
, 0, sizeof(struct ipv6_txoptions
));
1041 opt
->tot_len
= sizeof(*opt
);
1043 err
= datagram_send_ctl(sock_net(sk
), msg
, &fl
, opt
, &hlimit
, &tclass
);
1045 fl6_sock_release(flowlabel
);
1048 if ((fl
.fl6_flowlabel
&IPV6_FLOWLABEL_MASK
) && !flowlabel
) {
1049 flowlabel
= fl6_sock_lookup(sk
, fl
.fl6_flowlabel
);
1050 if (flowlabel
== NULL
)
1053 if (!(opt
->opt_nflen
|opt
->opt_flen
))
1060 opt
= fl6_merge_options(&opt_space
, flowlabel
, opt
);
1061 opt
= ipv6_fixup_options(&opt_space
, opt
);
1063 fl
.proto
= sk
->sk_protocol
;
1064 if (!ipv6_addr_any(daddr
))
1065 ipv6_addr_copy(&fl
.fl6_dst
, daddr
);
1067 fl
.fl6_dst
.s6_addr
[15] = 0x1; /* :: means loopback (BSD'ism) */
1068 if (ipv6_addr_any(&fl
.fl6_src
) && !ipv6_addr_any(&np
->saddr
))
1069 ipv6_addr_copy(&fl
.fl6_src
, &np
->saddr
);
1070 fl
.fl_ip_sport
= inet
->inet_sport
;
1072 /* merge ip6_build_xmit from ip6_output */
1073 if (opt
&& opt
->srcrt
) {
1074 struct rt0_hdr
*rt0
= (struct rt0_hdr
*) opt
->srcrt
;
1075 ipv6_addr_copy(&final
, &fl
.fl6_dst
);
1076 ipv6_addr_copy(&fl
.fl6_dst
, rt0
->addr
);
1081 if (!fl
.oif
&& ipv6_addr_is_multicast(&fl
.fl6_dst
)) {
1082 fl
.oif
= np
->mcast_oif
;
1086 security_sk_classify_flow(sk
, &fl
);
1088 err
= ip6_sk_dst_lookup(sk
, &dst
, &fl
);
1092 ipv6_addr_copy(&fl
.fl6_dst
, final_p
);
1094 err
= __xfrm_lookup(sock_net(sk
), &dst
, &fl
, sk
, XFRM_LOOKUP_WAIT
);
1096 if (err
== -EREMOTE
)
1097 err
= ip6_dst_blackhole(sk
, &dst
, &fl
);
1103 if (ipv6_addr_is_multicast(&fl
.fl6_dst
))
1104 hlimit
= np
->mcast_hops
;
1106 hlimit
= np
->hop_limit
;
1108 hlimit
= ip6_dst_hoplimit(dst
);
1112 tclass
= np
->tclass
;
1114 if (msg
->msg_flags
&MSG_CONFIRM
)
1119 if (unlikely(up
->pending
)) {
1120 /* The socket is already corked while preparing it. */
1121 /* ... which is an evident application bug. --ANK */
1124 LIMIT_NETDEBUG(KERN_DEBUG
"udp cork app bug 2\n");
1129 up
->pending
= AF_INET6
;
1133 getfrag
= is_udplite
? udplite_getfrag
: ip_generic_getfrag
;
1134 err
= ip6_append_data(sk
, getfrag
, msg
->msg_iov
, ulen
,
1135 sizeof(struct udphdr
), hlimit
, tclass
, opt
, &fl
,
1136 (struct rt6_info
*)dst
,
1137 corkreq
? msg
->msg_flags
|MSG_MORE
: msg
->msg_flags
);
1139 udp_v6_flush_pending_frames(sk
);
1141 err
= udp_v6_push_pending_frames(sk
);
1142 else if (unlikely(skb_queue_empty(&sk
->sk_write_queue
)))
1147 ip6_dst_store(sk
, dst
,
1148 ipv6_addr_equal(&fl
.fl6_dst
, &np
->daddr
) ?
1150 #ifdef CONFIG_IPV6_SUBTREES
1151 ipv6_addr_equal(&fl
.fl6_src
, &np
->saddr
) ?
1162 err
= np
->recverr
? net_xmit_errno(err
) : 0;
1166 fl6_sock_release(flowlabel
);
1170 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
1171 * ENOBUFS might not be good (it's not tunable per se), but otherwise
1172 * we don't have a good statistic (IpOutDiscards but it can be too many
1173 * things). We could add another new stat but at least for now that
1174 * seems like overkill.
1176 if (err
== -ENOBUFS
|| test_bit(SOCK_NOSPACE
, &sk
->sk_socket
->flags
)) {
1177 UDP6_INC_STATS_USER(sock_net(sk
),
1178 UDP_MIB_SNDBUFERRORS
, is_udplite
);
1184 if (!(msg
->msg_flags
&MSG_PROBE
) || len
)
1185 goto back_from_confirm
;
1190 void udpv6_destroy_sock(struct sock
*sk
)
1193 udp_v6_flush_pending_frames(sk
);
1196 inet6_destroy_sock(sk
);
1200 * Socket option code for UDP
1202 int udpv6_setsockopt(struct sock
*sk
, int level
, int optname
,
1203 char __user
*optval
, unsigned int optlen
)
1205 if (level
== SOL_UDP
|| level
== SOL_UDPLITE
)
1206 return udp_lib_setsockopt(sk
, level
, optname
, optval
, optlen
,
1207 udp_v6_push_pending_frames
);
1208 return ipv6_setsockopt(sk
, level
, optname
, optval
, optlen
);
1211 #ifdef CONFIG_COMPAT
1212 int compat_udpv6_setsockopt(struct sock
*sk
, int level
, int optname
,
1213 char __user
*optval
, unsigned int optlen
)
1215 if (level
== SOL_UDP
|| level
== SOL_UDPLITE
)
1216 return udp_lib_setsockopt(sk
, level
, optname
, optval
, optlen
,
1217 udp_v6_push_pending_frames
);
1218 return compat_ipv6_setsockopt(sk
, level
, optname
, optval
, optlen
);
1222 int udpv6_getsockopt(struct sock
*sk
, int level
, int optname
,
1223 char __user
*optval
, int __user
*optlen
)
1225 if (level
== SOL_UDP
|| level
== SOL_UDPLITE
)
1226 return udp_lib_getsockopt(sk
, level
, optname
, optval
, optlen
);
1227 return ipv6_getsockopt(sk
, level
, optname
, optval
, optlen
);
1230 #ifdef CONFIG_COMPAT
1231 int compat_udpv6_getsockopt(struct sock
*sk
, int level
, int optname
,
1232 char __user
*optval
, int __user
*optlen
)
1234 if (level
== SOL_UDP
|| level
== SOL_UDPLITE
)
1235 return udp_lib_getsockopt(sk
, level
, optname
, optval
, optlen
);
1236 return compat_ipv6_getsockopt(sk
, level
, optname
, optval
, optlen
);
1240 static int udp6_ufo_send_check(struct sk_buff
*skb
)
1242 struct ipv6hdr
*ipv6h
;
1245 if (!pskb_may_pull(skb
, sizeof(*uh
)))
1248 ipv6h
= ipv6_hdr(skb
);
1251 uh
->check
= ~csum_ipv6_magic(&ipv6h
->saddr
, &ipv6h
->daddr
, skb
->len
,
1253 skb
->csum_start
= skb_transport_header(skb
) - skb
->head
;
1254 skb
->csum_offset
= offsetof(struct udphdr
, check
);
1255 skb
->ip_summed
= CHECKSUM_PARTIAL
;
1259 static struct sk_buff
*udp6_ufo_fragment(struct sk_buff
*skb
, int features
)
1261 struct sk_buff
*segs
= ERR_PTR(-EINVAL
);
1263 unsigned int unfrag_ip6hlen
, unfrag_len
;
1264 struct frag_hdr
*fptr
;
1265 u8
*mac_start
, *prevhdr
;
1267 u8 frag_hdr_sz
= sizeof(struct frag_hdr
);
1271 mss
= skb_shinfo(skb
)->gso_size
;
1272 if (unlikely(skb
->len
<= mss
))
1275 if (skb_gso_ok(skb
, features
| NETIF_F_GSO_ROBUST
)) {
1276 /* Packet is from an untrusted source, reset gso_segs. */
1277 int type
= skb_shinfo(skb
)->gso_type
;
1279 if (unlikely(type
& ~(SKB_GSO_UDP
| SKB_GSO_DODGY
) ||
1280 !(type
& (SKB_GSO_UDP
))))
1283 skb_shinfo(skb
)->gso_segs
= DIV_ROUND_UP(skb
->len
, mss
);
1289 /* Do software UFO. Complete and fill in the UDP checksum as HW cannot
1290 * do checksum of UDP packets sent as multiple IP fragments.
1292 offset
= skb
->csum_start
- skb_headroom(skb
);
1293 csum
= skb_checksum(skb
, offset
, skb
->len
- offset
, 0);
1294 offset
+= skb
->csum_offset
;
1295 *(__sum16
*)(skb
->data
+ offset
) = csum_fold(csum
);
1296 skb
->ip_summed
= CHECKSUM_NONE
;
1298 /* Check if there is enough headroom to insert fragment header. */
1299 if ((skb_headroom(skb
) < frag_hdr_sz
) &&
1300 pskb_expand_head(skb
, frag_hdr_sz
, 0, GFP_ATOMIC
))
1303 /* Find the unfragmentable header and shift it left by frag_hdr_sz
1304 * bytes to insert fragment header.
1306 unfrag_ip6hlen
= ip6_find_1stfragopt(skb
, &prevhdr
);
1308 *prevhdr
= NEXTHDR_FRAGMENT
;
1309 unfrag_len
= skb_network_header(skb
) - skb_mac_header(skb
) +
1311 mac_start
= skb_mac_header(skb
);
1312 memmove(mac_start
-frag_hdr_sz
, mac_start
, unfrag_len
);
1314 skb
->mac_header
-= frag_hdr_sz
;
1315 skb
->network_header
-= frag_hdr_sz
;
1317 fptr
= (struct frag_hdr
*)(skb_network_header(skb
) + unfrag_ip6hlen
);
1318 fptr
->nexthdr
= nexthdr
;
1320 ipv6_select_ident(fptr
);
1322 /* Fragment the skb. ipv6 header and the remaining fields of the
1323 * fragment header are updated in ipv6_gso_segment()
1325 segs
= skb_segment(skb
, features
);
1331 static const struct inet6_protocol udpv6_protocol
= {
1332 .handler
= udpv6_rcv
,
1333 .err_handler
= udpv6_err
,
1334 .gso_send_check
= udp6_ufo_send_check
,
1335 .gso_segment
= udp6_ufo_fragment
,
1336 .flags
= INET6_PROTO_NOPOLICY
|INET6_PROTO_FINAL
,
1339 /* ------------------------------------------------------------------------ */
1340 #ifdef CONFIG_PROC_FS
1342 static void udp6_sock_seq_show(struct seq_file
*seq
, struct sock
*sp
, int bucket
)
1344 struct inet_sock
*inet
= inet_sk(sp
);
1345 struct ipv6_pinfo
*np
= inet6_sk(sp
);
1346 struct in6_addr
*dest
, *src
;
1350 src
= &np
->rcv_saddr
;
1351 destp
= ntohs(inet
->inet_dport
);
1352 srcp
= ntohs(inet
->inet_sport
);
1354 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1355 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %d\n",
1357 src
->s6_addr32
[0], src
->s6_addr32
[1],
1358 src
->s6_addr32
[2], src
->s6_addr32
[3], srcp
,
1359 dest
->s6_addr32
[0], dest
->s6_addr32
[1],
1360 dest
->s6_addr32
[2], dest
->s6_addr32
[3], destp
,
1362 sk_wmem_alloc_get(sp
),
1363 sk_rmem_alloc_get(sp
),
1367 atomic_read(&sp
->sk_refcnt
), sp
,
1368 atomic_read(&sp
->sk_drops
));
1371 int udp6_seq_show(struct seq_file
*seq
, void *v
)
1373 if (v
== SEQ_START_TOKEN
)
1378 "st tx_queue rx_queue tr tm->when retrnsmt"
1379 " uid timeout inode ref pointer drops\n");
1381 udp6_sock_seq_show(seq
, v
, ((struct udp_iter_state
*)seq
->private)->bucket
);
1385 static struct udp_seq_afinfo udp6_seq_afinfo
= {
1388 .udp_table
= &udp_table
,
1390 .owner
= THIS_MODULE
,
1393 .show
= udp6_seq_show
,
1397 int __net_init
udp6_proc_init(struct net
*net
)
1399 return udp_proc_register(net
, &udp6_seq_afinfo
);
1402 void udp6_proc_exit(struct net
*net
) {
1403 udp_proc_unregister(net
, &udp6_seq_afinfo
);
1405 #endif /* CONFIG_PROC_FS */
1407 /* ------------------------------------------------------------------------ */
1409 struct proto udpv6_prot
= {
1411 .owner
= THIS_MODULE
,
1412 .close
= udp_lib_close
,
1413 .connect
= ip6_datagram_connect
,
1414 .disconnect
= udp_disconnect
,
1416 .destroy
= udpv6_destroy_sock
,
1417 .setsockopt
= udpv6_setsockopt
,
1418 .getsockopt
= udpv6_getsockopt
,
1419 .sendmsg
= udpv6_sendmsg
,
1420 .recvmsg
= udpv6_recvmsg
,
1421 .backlog_rcv
= udpv6_queue_rcv_skb
,
1422 .hash
= udp_lib_hash
,
1423 .unhash
= udp_lib_unhash
,
1424 .get_port
= udp_v6_get_port
,
1425 .memory_allocated
= &udp_memory_allocated
,
1426 .sysctl_mem
= sysctl_udp_mem
,
1427 .sysctl_wmem
= &sysctl_udp_wmem_min
,
1428 .sysctl_rmem
= &sysctl_udp_rmem_min
,
1429 .obj_size
= sizeof(struct udp6_sock
),
1430 .slab_flags
= SLAB_DESTROY_BY_RCU
,
1431 .h
.udp_table
= &udp_table
,
1432 #ifdef CONFIG_COMPAT
1433 .compat_setsockopt
= compat_udpv6_setsockopt
,
1434 .compat_getsockopt
= compat_udpv6_getsockopt
,
1438 static struct inet_protosw udpv6_protosw
= {
1440 .protocol
= IPPROTO_UDP
,
1441 .prot
= &udpv6_prot
,
1442 .ops
= &inet6_dgram_ops
,
1443 .no_check
= UDP_CSUM_DEFAULT
,
1444 .flags
= INET_PROTOSW_PERMANENT
,
1448 int __init
udpv6_init(void)
1452 ret
= inet6_add_protocol(&udpv6_protocol
, IPPROTO_UDP
);
1456 ret
= inet6_register_protosw(&udpv6_protosw
);
1458 goto out_udpv6_protocol
;
1463 inet6_del_protocol(&udpv6_protocol
, IPPROTO_UDP
);
1467 void udpv6_exit(void)
1469 inet6_unregister_protosw(&udpv6_protosw
);
1470 inet6_del_protocol(&udpv6_protocol
, IPPROTO_UDP
);