3 * Linux INET6 implementation
6 * Pedro Roque <roque@di.fc.ul.pt>
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
14 #include <linux/capability.h>
15 #include <linux/errno.h>
16 #include <linux/types.h>
17 #include <linux/kernel.h>
18 #include <linux/interrupt.h>
19 #include <linux/socket.h>
20 #include <linux/sockios.h>
21 #include <linux/in6.h>
22 #include <linux/ipv6.h>
23 #include <linux/route.h>
24 #include <linux/slab.h>
25 #include <linux/export.h>
28 #include <net/ndisc.h>
29 #include <net/addrconf.h>
30 #include <net/transp_v6.h>
31 #include <net/ip6_route.h>
32 #include <net/tcp_states.h>
33 #include <net/dsfield.h>
35 #include <linux/errqueue.h>
36 #include <asm/uaccess.h>
38 static bool ipv6_mapped_addr_any(const struct in6_addr
*a
)
40 return ipv6_addr_v4mapped(a
) && (a
->s6_addr32
[3] == 0);
43 static int __ip6_datagram_connect(struct sock
*sk
, struct sockaddr
*uaddr
, int addr_len
)
45 struct sockaddr_in6
*usin
= (struct sockaddr_in6
*) uaddr
;
46 struct inet_sock
*inet
= inet_sk(sk
);
47 struct ipv6_pinfo
*np
= inet6_sk(sk
);
48 struct in6_addr
*daddr
, *final_p
, final
;
49 struct dst_entry
*dst
;
51 struct ip6_flowlabel
*flowlabel
= NULL
;
52 struct ipv6_txoptions
*opt
;
56 if (usin
->sin6_family
== AF_INET
) {
57 if (__ipv6_only_sock(sk
))
59 err
= __ip4_datagram_connect(sk
, uaddr
, addr_len
);
63 if (addr_len
< SIN6_LEN_RFC2133
)
66 if (usin
->sin6_family
!= AF_INET6
)
69 memset(&fl6
, 0, sizeof(fl6
));
71 fl6
.flowlabel
= usin
->sin6_flowinfo
&IPV6_FLOWINFO_MASK
;
72 if (fl6
.flowlabel
&IPV6_FLOWLABEL_MASK
) {
73 flowlabel
= fl6_sock_lookup(sk
, fl6
.flowlabel
);
74 if (flowlabel
== NULL
)
76 usin
->sin6_addr
= flowlabel
->dst
;
80 addr_type
= ipv6_addr_type(&usin
->sin6_addr
);
82 if (addr_type
== IPV6_ADDR_ANY
) {
86 usin
->sin6_addr
.s6_addr
[15] = 0x01;
89 daddr
= &usin
->sin6_addr
;
91 if (addr_type
== IPV6_ADDR_MAPPED
) {
92 struct sockaddr_in sin
;
94 if (__ipv6_only_sock(sk
)) {
98 sin
.sin_family
= AF_INET
;
99 sin
.sin_addr
.s_addr
= daddr
->s6_addr32
[3];
100 sin
.sin_port
= usin
->sin6_port
;
102 err
= __ip4_datagram_connect(sk
,
103 (struct sockaddr
*) &sin
,
110 ipv6_addr_set_v4mapped(inet
->inet_daddr
, &np
->daddr
);
112 if (ipv6_addr_any(&np
->saddr
) ||
113 ipv6_mapped_addr_any(&np
->saddr
))
114 ipv6_addr_set_v4mapped(inet
->inet_saddr
, &np
->saddr
);
116 if (ipv6_addr_any(&np
->rcv_saddr
) ||
117 ipv6_mapped_addr_any(&np
->rcv_saddr
)) {
118 ipv6_addr_set_v4mapped(inet
->inet_rcv_saddr
,
120 if (sk
->sk_prot
->rehash
)
121 sk
->sk_prot
->rehash(sk
);
127 if (__ipv6_addr_needs_scope_id(addr_type
)) {
128 if (addr_len
>= sizeof(struct sockaddr_in6
) &&
129 usin
->sin6_scope_id
) {
130 if (sk
->sk_bound_dev_if
&&
131 sk
->sk_bound_dev_if
!= usin
->sin6_scope_id
) {
135 sk
->sk_bound_dev_if
= usin
->sin6_scope_id
;
138 if (!sk
->sk_bound_dev_if
&& (addr_type
& IPV6_ADDR_MULTICAST
))
139 sk
->sk_bound_dev_if
= np
->mcast_oif
;
141 /* Connect to link-local address requires an interface */
142 if (!sk
->sk_bound_dev_if
) {
149 np
->flow_label
= fl6
.flowlabel
;
151 inet
->inet_dport
= usin
->sin6_port
;
154 * Check for a route to destination an obtain the
155 * destination cache for it.
158 fl6
.flowi6_proto
= sk
->sk_protocol
;
159 fl6
.daddr
= np
->daddr
;
160 fl6
.saddr
= np
->saddr
;
161 fl6
.flowi6_oif
= sk
->sk_bound_dev_if
;
162 fl6
.flowi6_mark
= sk
->sk_mark
;
163 fl6
.fl6_dport
= inet
->inet_dport
;
164 fl6
.fl6_sport
= inet
->inet_sport
;
165 fl6
.flowi6_uid
= sock_i_uid(sk
);
167 if (!fl6
.flowi6_oif
&& (addr_type
&IPV6_ADDR_MULTICAST
))
168 fl6
.flowi6_oif
= np
->mcast_oif
;
170 security_sk_classify_flow(sk
, flowi6_to_flowi(&fl6
));
172 opt
= flowlabel
? flowlabel
->opt
: np
->opt
;
173 final_p
= fl6_update_dst(&fl6
, opt
, &final
);
175 dst
= ip6_dst_lookup_flow(sk
, &fl6
, final_p
, true);
182 /* source address lookup done in ip6_dst_lookup */
184 if (ipv6_addr_any(&np
->saddr
))
185 np
->saddr
= fl6
.saddr
;
187 if (ipv6_addr_any(&np
->rcv_saddr
)) {
188 np
->rcv_saddr
= fl6
.saddr
;
189 inet
->inet_rcv_saddr
= LOOPBACK4_IPV6
;
190 if (sk
->sk_prot
->rehash
)
191 sk
->sk_prot
->rehash(sk
);
194 ip6_dst_store(sk
, dst
,
195 ipv6_addr_equal(&fl6
.daddr
, &np
->daddr
) ?
197 #ifdef CONFIG_IPV6_SUBTREES
198 ipv6_addr_equal(&fl6
.saddr
, &np
->saddr
) ?
203 sk
->sk_state
= TCP_ESTABLISHED
;
205 fl6_sock_release(flowlabel
);
209 int ip6_datagram_connect(struct sock
*sk
, struct sockaddr
*uaddr
, int addr_len
)
214 res
= __ip6_datagram_connect(sk
, uaddr
, addr_len
);
218 EXPORT_SYMBOL_GPL(ip6_datagram_connect
);
220 void ipv6_icmp_error(struct sock
*sk
, struct sk_buff
*skb
, int err
,
221 __be16 port
, u32 info
, u8
*payload
)
223 struct ipv6_pinfo
*np
= inet6_sk(sk
);
224 struct icmp6hdr
*icmph
= icmp6_hdr(skb
);
225 struct sock_exterr_skb
*serr
;
230 skb
= skb_clone(skb
, GFP_ATOMIC
);
234 skb
->protocol
= htons(ETH_P_IPV6
);
236 serr
= SKB_EXT_ERR(skb
);
237 serr
->ee
.ee_errno
= err
;
238 serr
->ee
.ee_origin
= SO_EE_ORIGIN_ICMP6
;
239 serr
->ee
.ee_type
= icmph
->icmp6_type
;
240 serr
->ee
.ee_code
= icmph
->icmp6_code
;
242 serr
->ee
.ee_info
= info
;
243 serr
->ee
.ee_data
= 0;
244 serr
->addr_offset
= (u8
*)&(((struct ipv6hdr
*)(icmph
+ 1))->daddr
) -
245 skb_network_header(skb
);
248 __skb_pull(skb
, payload
- skb
->data
);
249 skb_reset_transport_header(skb
);
251 if (sock_queue_err_skb(sk
, skb
))
255 void ipv6_local_error(struct sock
*sk
, int err
, struct flowi6
*fl6
, u32 info
)
257 struct ipv6_pinfo
*np
= inet6_sk(sk
);
258 struct sock_exterr_skb
*serr
;
265 skb
= alloc_skb(sizeof(struct ipv6hdr
), GFP_ATOMIC
);
269 skb
->protocol
= htons(ETH_P_IPV6
);
271 skb_put(skb
, sizeof(struct ipv6hdr
));
272 skb_reset_network_header(skb
);
274 iph
->daddr
= fl6
->daddr
;
276 serr
= SKB_EXT_ERR(skb
);
277 serr
->ee
.ee_errno
= err
;
278 serr
->ee
.ee_origin
= SO_EE_ORIGIN_LOCAL
;
279 serr
->ee
.ee_type
= 0;
280 serr
->ee
.ee_code
= 0;
282 serr
->ee
.ee_info
= info
;
283 serr
->ee
.ee_data
= 0;
284 serr
->addr_offset
= (u8
*)&iph
->daddr
- skb_network_header(skb
);
285 serr
->port
= fl6
->fl6_dport
;
287 __skb_pull(skb
, skb_tail_pointer(skb
) - skb
->data
);
288 skb_reset_transport_header(skb
);
290 if (sock_queue_err_skb(sk
, skb
))
294 void ipv6_local_rxpmtu(struct sock
*sk
, struct flowi6
*fl6
, u32 mtu
)
296 struct ipv6_pinfo
*np
= inet6_sk(sk
);
299 struct ip6_mtuinfo
*mtu_info
;
301 if (!np
->rxopt
.bits
.rxpmtu
)
304 skb
= alloc_skb(sizeof(struct ipv6hdr
), GFP_ATOMIC
);
308 skb_put(skb
, sizeof(struct ipv6hdr
));
309 skb_reset_network_header(skb
);
311 iph
->daddr
= fl6
->daddr
;
313 mtu_info
= IP6CBMTU(skb
);
315 mtu_info
->ip6m_mtu
= mtu
;
316 mtu_info
->ip6m_addr
.sin6_family
= AF_INET6
;
317 mtu_info
->ip6m_addr
.sin6_port
= 0;
318 mtu_info
->ip6m_addr
.sin6_flowinfo
= 0;
319 mtu_info
->ip6m_addr
.sin6_scope_id
= fl6
->flowi6_oif
;
320 mtu_info
->ip6m_addr
.sin6_addr
= ipv6_hdr(skb
)->daddr
;
322 __skb_pull(skb
, skb_tail_pointer(skb
) - skb
->data
);
323 skb_reset_transport_header(skb
);
325 skb
= xchg(&np
->rxpmtu
, skb
);
330 * Handle MSG_ERRQUEUE
332 int ipv6_recv_error(struct sock
*sk
, struct msghdr
*msg
, int len
, int *addr_len
)
334 struct ipv6_pinfo
*np
= inet6_sk(sk
);
335 struct sock_exterr_skb
*serr
;
336 struct sk_buff
*skb
, *skb2
;
337 struct sockaddr_in6
*sin
;
339 struct sock_extended_err ee
;
340 struct sockaddr_in6 offender
;
346 skb
= skb_dequeue(&sk
->sk_error_queue
);
352 msg
->msg_flags
|= MSG_TRUNC
;
355 err
= skb_copy_datagram_iovec(skb
, 0, msg
->msg_iov
, copied
);
359 sock_recv_timestamp(msg
, sk
, skb
);
361 serr
= SKB_EXT_ERR(skb
);
363 sin
= (struct sockaddr_in6
*)msg
->msg_name
;
365 const unsigned char *nh
= skb_network_header(skb
);
366 sin
->sin6_family
= AF_INET6
;
367 sin
->sin6_flowinfo
= 0;
368 sin
->sin6_port
= serr
->port
;
369 if (skb
->protocol
== htons(ETH_P_IPV6
)) {
370 const struct ipv6hdr
*ip6h
= container_of((struct in6_addr
*)(nh
+ serr
->addr_offset
),
371 struct ipv6hdr
, daddr
);
372 sin
->sin6_addr
= ip6h
->daddr
;
374 sin
->sin6_flowinfo
= ip6_flowinfo(ip6h
);
376 ipv6_iface_scope_id(&sin
->sin6_addr
,
379 ipv6_addr_set_v4mapped(*(__be32
*)(nh
+ serr
->addr_offset
),
381 sin
->sin6_scope_id
= 0;
383 *addr_len
= sizeof(*sin
);
386 memcpy(&errhdr
.ee
, &serr
->ee
, sizeof(struct sock_extended_err
));
387 sin
= &errhdr
.offender
;
388 memset(sin
, 0, sizeof(*sin
));
390 if (serr
->ee
.ee_origin
!= SO_EE_ORIGIN_LOCAL
) {
391 sin
->sin6_family
= AF_INET6
;
392 if (skb
->protocol
== htons(ETH_P_IPV6
)) {
393 sin
->sin6_addr
= ipv6_hdr(skb
)->saddr
;
395 ip6_datagram_recv_ctl(sk
, msg
, skb
);
397 ipv6_iface_scope_id(&sin
->sin6_addr
,
400 ipv6_addr_set_v4mapped(ip_hdr(skb
)->saddr
,
402 if (inet_sk(sk
)->cmsg_flags
)
403 ip_cmsg_recv(msg
, skb
);
407 put_cmsg(msg
, SOL_IPV6
, IPV6_RECVERR
, sizeof(errhdr
), &errhdr
);
409 /* Now we could try to dump offended packet options */
411 msg
->msg_flags
|= MSG_ERRQUEUE
;
414 /* Reset and regenerate socket error */
415 spin_lock_bh(&sk
->sk_error_queue
.lock
);
417 if ((skb2
= skb_peek(&sk
->sk_error_queue
)) != NULL
) {
418 sk
->sk_err
= SKB_EXT_ERR(skb2
)->ee
.ee_errno
;
419 spin_unlock_bh(&sk
->sk_error_queue
.lock
);
420 sk
->sk_error_report(sk
);
422 spin_unlock_bh(&sk
->sk_error_queue
.lock
);
430 EXPORT_SYMBOL_GPL(ipv6_recv_error
);
433 * Handle IPV6_RECVPATHMTU
435 int ipv6_recv_rxpmtu(struct sock
*sk
, struct msghdr
*msg
, int len
,
438 struct ipv6_pinfo
*np
= inet6_sk(sk
);
440 struct sockaddr_in6
*sin
;
441 struct ip6_mtuinfo mtu_info
;
446 skb
= xchg(&np
->rxpmtu
, NULL
);
452 msg
->msg_flags
|= MSG_TRUNC
;
455 err
= skb_copy_datagram_iovec(skb
, 0, msg
->msg_iov
, copied
);
459 sock_recv_timestamp(msg
, sk
, skb
);
461 memcpy(&mtu_info
, IP6CBMTU(skb
), sizeof(mtu_info
));
463 sin
= (struct sockaddr_in6
*)msg
->msg_name
;
465 sin
->sin6_family
= AF_INET6
;
466 sin
->sin6_flowinfo
= 0;
468 sin
->sin6_scope_id
= mtu_info
.ip6m_addr
.sin6_scope_id
;
469 sin
->sin6_addr
= mtu_info
.ip6m_addr
.sin6_addr
;
470 *addr_len
= sizeof(*sin
);
473 put_cmsg(msg
, SOL_IPV6
, IPV6_PATHMTU
, sizeof(mtu_info
), &mtu_info
);
484 int ip6_datagram_recv_ctl(struct sock
*sk
, struct msghdr
*msg
,
487 struct ipv6_pinfo
*np
= inet6_sk(sk
);
488 struct inet6_skb_parm
*opt
= IP6CB(skb
);
489 unsigned char *nh
= skb_network_header(skb
);
491 if (np
->rxopt
.bits
.rxinfo
) {
492 struct in6_pktinfo src_info
;
494 src_info
.ipi6_ifindex
= opt
->iif
;
495 src_info
.ipi6_addr
= ipv6_hdr(skb
)->daddr
;
496 put_cmsg(msg
, SOL_IPV6
, IPV6_PKTINFO
, sizeof(src_info
), &src_info
);
499 if (np
->rxopt
.bits
.rxhlim
) {
500 int hlim
= ipv6_hdr(skb
)->hop_limit
;
501 put_cmsg(msg
, SOL_IPV6
, IPV6_HOPLIMIT
, sizeof(hlim
), &hlim
);
504 if (np
->rxopt
.bits
.rxtclass
) {
505 int tclass
= ipv6_get_dsfield(ipv6_hdr(skb
));
506 put_cmsg(msg
, SOL_IPV6
, IPV6_TCLASS
, sizeof(tclass
), &tclass
);
509 if (np
->rxopt
.bits
.rxflow
) {
510 __be32 flowinfo
= ip6_flowinfo((struct ipv6hdr
*)nh
);
512 put_cmsg(msg
, SOL_IPV6
, IPV6_FLOWINFO
, sizeof(flowinfo
), &flowinfo
);
515 /* HbH is allowed only once */
516 if (np
->rxopt
.bits
.hopopts
&& opt
->hop
) {
517 u8
*ptr
= nh
+ opt
->hop
;
518 put_cmsg(msg
, SOL_IPV6
, IPV6_HOPOPTS
, (ptr
[1]+1)<<3, ptr
);
522 (np
->rxopt
.bits
.dstopts
|| np
->rxopt
.bits
.srcrt
)) {
524 * Silly enough, but we need to reparse in order to
525 * report extension headers (except for HbH)
528 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT
529 * (and WILL NOT be) defined because
530 * IPV6_RECVDSTOPTS is more generic. --yoshfuji
532 unsigned int off
= sizeof(struct ipv6hdr
);
533 u8 nexthdr
= ipv6_hdr(skb
)->nexthdr
;
535 while (off
<= opt
->lastopt
) {
540 case IPPROTO_DSTOPTS
:
542 len
= (ptr
[1] + 1) << 3;
543 if (np
->rxopt
.bits
.dstopts
)
544 put_cmsg(msg
, SOL_IPV6
, IPV6_DSTOPTS
, len
, ptr
);
546 case IPPROTO_ROUTING
:
548 len
= (ptr
[1] + 1) << 3;
549 if (np
->rxopt
.bits
.srcrt
)
550 put_cmsg(msg
, SOL_IPV6
, IPV6_RTHDR
, len
, ptr
);
554 len
= (ptr
[1] + 2) << 2;
558 len
= (ptr
[1] + 1) << 3;
566 /* socket options in old style */
567 if (np
->rxopt
.bits
.rxoinfo
) {
568 struct in6_pktinfo src_info
;
570 src_info
.ipi6_ifindex
= opt
->iif
;
571 src_info
.ipi6_addr
= ipv6_hdr(skb
)->daddr
;
572 put_cmsg(msg
, SOL_IPV6
, IPV6_2292PKTINFO
, sizeof(src_info
), &src_info
);
574 if (np
->rxopt
.bits
.rxohlim
) {
575 int hlim
= ipv6_hdr(skb
)->hop_limit
;
576 put_cmsg(msg
, SOL_IPV6
, IPV6_2292HOPLIMIT
, sizeof(hlim
), &hlim
);
578 if (np
->rxopt
.bits
.ohopopts
&& opt
->hop
) {
579 u8
*ptr
= nh
+ opt
->hop
;
580 put_cmsg(msg
, SOL_IPV6
, IPV6_2292HOPOPTS
, (ptr
[1]+1)<<3, ptr
);
582 if (np
->rxopt
.bits
.odstopts
&& opt
->dst0
) {
583 u8
*ptr
= nh
+ opt
->dst0
;
584 put_cmsg(msg
, SOL_IPV6
, IPV6_2292DSTOPTS
, (ptr
[1]+1)<<3, ptr
);
586 if (np
->rxopt
.bits
.osrcrt
&& opt
->srcrt
) {
587 struct ipv6_rt_hdr
*rthdr
= (struct ipv6_rt_hdr
*)(nh
+ opt
->srcrt
);
588 put_cmsg(msg
, SOL_IPV6
, IPV6_2292RTHDR
, (rthdr
->hdrlen
+1) << 3, rthdr
);
590 if (np
->rxopt
.bits
.odstopts
&& opt
->dst1
) {
591 u8
*ptr
= nh
+ opt
->dst1
;
592 put_cmsg(msg
, SOL_IPV6
, IPV6_2292DSTOPTS
, (ptr
[1]+1)<<3, ptr
);
594 if (np
->rxopt
.bits
.rxorigdstaddr
) {
595 struct sockaddr_in6 sin6
;
596 __be16
*ports
= (__be16
*) skb_transport_header(skb
);
598 if (skb_transport_offset(skb
) + 4 <= skb
->len
) {
599 /* All current transport protocols have the port numbers in the
600 * first four bytes of the transport header and this function is
601 * written with this assumption in mind.
604 sin6
.sin6_family
= AF_INET6
;
605 sin6
.sin6_addr
= ipv6_hdr(skb
)->daddr
;
606 sin6
.sin6_port
= ports
[1];
607 sin6
.sin6_flowinfo
= 0;
609 ipv6_iface_scope_id(&ipv6_hdr(skb
)->daddr
,
612 put_cmsg(msg
, SOL_IPV6
, IPV6_ORIGDSTADDR
, sizeof(sin6
), &sin6
);
617 EXPORT_SYMBOL_GPL(ip6_datagram_recv_ctl
);
619 int ip6_datagram_send_ctl(struct net
*net
, struct sock
*sk
,
620 struct msghdr
*msg
, struct flowi6
*fl6
,
621 struct ipv6_txoptions
*opt
,
622 int *hlimit
, int *tclass
, int *dontfrag
)
624 struct in6_pktinfo
*src_info
;
625 struct cmsghdr
*cmsg
;
626 struct ipv6_rt_hdr
*rthdr
;
627 struct ipv6_opt_hdr
*hdr
;
631 for (cmsg
= CMSG_FIRSTHDR(msg
); cmsg
; cmsg
= CMSG_NXTHDR(msg
, cmsg
)) {
634 if (!CMSG_OK(msg
, cmsg
)) {
639 if (cmsg
->cmsg_level
!= SOL_IPV6
)
642 switch (cmsg
->cmsg_type
) {
644 case IPV6_2292PKTINFO
:
646 struct net_device
*dev
= NULL
;
648 if (cmsg
->cmsg_len
< CMSG_LEN(sizeof(struct in6_pktinfo
))) {
653 src_info
= (struct in6_pktinfo
*)CMSG_DATA(cmsg
);
655 if (src_info
->ipi6_ifindex
) {
656 if (fl6
->flowi6_oif
&&
657 src_info
->ipi6_ifindex
!= fl6
->flowi6_oif
)
659 fl6
->flowi6_oif
= src_info
->ipi6_ifindex
;
662 addr_type
= __ipv6_addr_type(&src_info
->ipi6_addr
);
665 if (fl6
->flowi6_oif
) {
666 dev
= dev_get_by_index_rcu(net
, fl6
->flowi6_oif
);
671 } else if (addr_type
& IPV6_ADDR_LINKLOCAL
) {
676 if (addr_type
!= IPV6_ADDR_ANY
) {
677 int strict
= __ipv6_addr_src_scope(addr_type
) <= IPV6_ADDR_SCOPE_LINKLOCAL
;
678 if (!(inet_sk(sk
)->freebind
|| inet_sk(sk
)->transparent
) &&
679 !ipv6_chk_addr(net
, &src_info
->ipi6_addr
,
680 strict
? dev
: NULL
, 0))
683 fl6
->saddr
= src_info
->ipi6_addr
;
695 if (cmsg
->cmsg_len
< CMSG_LEN(4)) {
700 if (fl6
->flowlabel
&IPV6_FLOWINFO_MASK
) {
701 if ((fl6
->flowlabel
^*(__be32
*)CMSG_DATA(cmsg
))&~IPV6_FLOWINFO_MASK
) {
706 fl6
->flowlabel
= IPV6_FLOWINFO_MASK
& *(__be32
*)CMSG_DATA(cmsg
);
709 case IPV6_2292HOPOPTS
:
711 if (opt
->hopopt
|| cmsg
->cmsg_len
< CMSG_LEN(sizeof(struct ipv6_opt_hdr
))) {
716 hdr
= (struct ipv6_opt_hdr
*)CMSG_DATA(cmsg
);
717 len
= ((hdr
->hdrlen
+ 1) << 3);
718 if (cmsg
->cmsg_len
< CMSG_LEN(len
)) {
722 if (!ns_capable(net
->user_ns
, CAP_NET_RAW
)) {
726 opt
->opt_nflen
+= len
;
730 case IPV6_2292DSTOPTS
:
731 if (cmsg
->cmsg_len
< CMSG_LEN(sizeof(struct ipv6_opt_hdr
))) {
736 hdr
= (struct ipv6_opt_hdr
*)CMSG_DATA(cmsg
);
737 len
= ((hdr
->hdrlen
+ 1) << 3);
738 if (cmsg
->cmsg_len
< CMSG_LEN(len
)) {
742 if (!ns_capable(net
->user_ns
, CAP_NET_RAW
)) {
750 opt
->opt_flen
+= len
;
755 case IPV6_RTHDRDSTOPTS
:
756 if (cmsg
->cmsg_len
< CMSG_LEN(sizeof(struct ipv6_opt_hdr
))) {
761 hdr
= (struct ipv6_opt_hdr
*)CMSG_DATA(cmsg
);
762 len
= ((hdr
->hdrlen
+ 1) << 3);
763 if (cmsg
->cmsg_len
< CMSG_LEN(len
)) {
767 if (!ns_capable(net
->user_ns
, CAP_NET_RAW
)) {
771 if (cmsg
->cmsg_type
== IPV6_DSTOPTS
) {
772 opt
->opt_flen
+= len
;
775 opt
->opt_nflen
+= len
;
782 if (cmsg
->cmsg_len
< CMSG_LEN(sizeof(struct ipv6_rt_hdr
))) {
787 rthdr
= (struct ipv6_rt_hdr
*)CMSG_DATA(cmsg
);
789 switch (rthdr
->type
) {
790 #if IS_ENABLED(CONFIG_IPV6_MIP6)
791 case IPV6_SRCRT_TYPE_2
:
792 if (rthdr
->hdrlen
!= 2 ||
793 rthdr
->segments_left
!= 1) {
804 len
= ((rthdr
->hdrlen
+ 1) << 3);
806 if (cmsg
->cmsg_len
< CMSG_LEN(len
)) {
811 /* segments left must also match */
812 if ((rthdr
->hdrlen
>> 1) != rthdr
->segments_left
) {
817 opt
->opt_nflen
+= len
;
820 if (cmsg
->cmsg_type
== IPV6_2292RTHDR
&& opt
->dst1opt
) {
821 int dsthdrlen
= ((opt
->dst1opt
->hdrlen
+1)<<3);
823 opt
->opt_nflen
+= dsthdrlen
;
824 opt
->dst0opt
= opt
->dst1opt
;
826 opt
->opt_flen
-= dsthdrlen
;
831 case IPV6_2292HOPLIMIT
:
833 if (cmsg
->cmsg_len
!= CMSG_LEN(sizeof(int))) {
838 *hlimit
= *(int *)CMSG_DATA(cmsg
);
839 if (*hlimit
< -1 || *hlimit
> 0xff) {
851 if (cmsg
->cmsg_len
!= CMSG_LEN(sizeof(int)))
854 tc
= *(int *)CMSG_DATA(cmsg
);
855 if (tc
< -1 || tc
> 0xff)
869 if (cmsg
->cmsg_len
!= CMSG_LEN(sizeof(int)))
872 df
= *(int *)CMSG_DATA(cmsg
);
873 if (df
< 0 || df
> 1)
882 LIMIT_NETDEBUG(KERN_DEBUG
"invalid cmsg type: %d\n",
892 EXPORT_SYMBOL_GPL(ip6_datagram_send_ctl
);
894 void ip6_dgram_sock_seq_show(struct seq_file
*seq
, struct sock
*sp
,
895 __u16 srcp
, __u16 destp
, int bucket
)
897 struct ipv6_pinfo
*np
= inet6_sk(sp
);
898 const struct in6_addr
*dest
, *src
;
901 src
= &np
->rcv_saddr
;
903 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
904 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %d\n",
906 src
->s6_addr32
[0], src
->s6_addr32
[1],
907 src
->s6_addr32
[2], src
->s6_addr32
[3], srcp
,
908 dest
->s6_addr32
[0], dest
->s6_addr32
[1],
909 dest
->s6_addr32
[2], dest
->s6_addr32
[3], destp
,
911 sk_wmem_alloc_get(sp
),
912 sk_rmem_alloc_get(sp
),
914 from_kuid_munged(seq_user_ns(seq
), sock_i_uid(sp
)),
917 atomic_read(&sp
->sk_refcnt
), sp
,
918 atomic_read(&sp
->sk_drops
));