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 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
);
208 EXPORT_SYMBOL_GPL(ip6_datagram_connect
);
210 void ipv6_icmp_error(struct sock
*sk
, struct sk_buff
*skb
, int err
,
211 __be16 port
, u32 info
, u8
*payload
)
213 struct ipv6_pinfo
*np
= inet6_sk(sk
);
214 struct icmp6hdr
*icmph
= icmp6_hdr(skb
);
215 struct sock_exterr_skb
*serr
;
220 skb
= skb_clone(skb
, GFP_ATOMIC
);
224 skb
->protocol
= htons(ETH_P_IPV6
);
226 serr
= SKB_EXT_ERR(skb
);
227 serr
->ee
.ee_errno
= err
;
228 serr
->ee
.ee_origin
= SO_EE_ORIGIN_ICMP6
;
229 serr
->ee
.ee_type
= icmph
->icmp6_type
;
230 serr
->ee
.ee_code
= icmph
->icmp6_code
;
232 serr
->ee
.ee_info
= info
;
233 serr
->ee
.ee_data
= 0;
234 serr
->addr_offset
= (u8
*)&(((struct ipv6hdr
*)(icmph
+ 1))->daddr
) -
235 skb_network_header(skb
);
238 __skb_pull(skb
, payload
- skb
->data
);
239 skb_reset_transport_header(skb
);
241 if (sock_queue_err_skb(sk
, skb
))
245 void ipv6_local_error(struct sock
*sk
, int err
, struct flowi6
*fl6
, u32 info
)
247 struct ipv6_pinfo
*np
= inet6_sk(sk
);
248 struct sock_exterr_skb
*serr
;
255 skb
= alloc_skb(sizeof(struct ipv6hdr
), GFP_ATOMIC
);
259 skb
->protocol
= htons(ETH_P_IPV6
);
261 skb_put(skb
, sizeof(struct ipv6hdr
));
262 skb_reset_network_header(skb
);
264 iph
->daddr
= fl6
->daddr
;
266 serr
= SKB_EXT_ERR(skb
);
267 serr
->ee
.ee_errno
= err
;
268 serr
->ee
.ee_origin
= SO_EE_ORIGIN_LOCAL
;
269 serr
->ee
.ee_type
= 0;
270 serr
->ee
.ee_code
= 0;
272 serr
->ee
.ee_info
= info
;
273 serr
->ee
.ee_data
= 0;
274 serr
->addr_offset
= (u8
*)&iph
->daddr
- skb_network_header(skb
);
275 serr
->port
= fl6
->fl6_dport
;
277 __skb_pull(skb
, skb_tail_pointer(skb
) - skb
->data
);
278 skb_reset_transport_header(skb
);
280 if (sock_queue_err_skb(sk
, skb
))
284 void ipv6_local_rxpmtu(struct sock
*sk
, struct flowi6
*fl6
, u32 mtu
)
286 struct ipv6_pinfo
*np
= inet6_sk(sk
);
289 struct ip6_mtuinfo
*mtu_info
;
291 if (!np
->rxopt
.bits
.rxpmtu
)
294 skb
= alloc_skb(sizeof(struct ipv6hdr
), GFP_ATOMIC
);
298 skb_put(skb
, sizeof(struct ipv6hdr
));
299 skb_reset_network_header(skb
);
301 iph
->daddr
= fl6
->daddr
;
303 mtu_info
= IP6CBMTU(skb
);
305 mtu_info
->ip6m_mtu
= mtu
;
306 mtu_info
->ip6m_addr
.sin6_family
= AF_INET6
;
307 mtu_info
->ip6m_addr
.sin6_port
= 0;
308 mtu_info
->ip6m_addr
.sin6_flowinfo
= 0;
309 mtu_info
->ip6m_addr
.sin6_scope_id
= fl6
->flowi6_oif
;
310 mtu_info
->ip6m_addr
.sin6_addr
= ipv6_hdr(skb
)->daddr
;
312 __skb_pull(skb
, skb_tail_pointer(skb
) - skb
->data
);
313 skb_reset_transport_header(skb
);
315 skb
= xchg(&np
->rxpmtu
, skb
);
320 * Handle MSG_ERRQUEUE
322 int ipv6_recv_error(struct sock
*sk
, struct msghdr
*msg
, int len
, int *addr_len
)
324 struct ipv6_pinfo
*np
= inet6_sk(sk
);
325 struct sock_exterr_skb
*serr
;
326 struct sk_buff
*skb
, *skb2
;
327 struct sockaddr_in6
*sin
;
329 struct sock_extended_err ee
;
330 struct sockaddr_in6 offender
;
336 skb
= skb_dequeue(&sk
->sk_error_queue
);
342 msg
->msg_flags
|= MSG_TRUNC
;
345 err
= skb_copy_datagram_iovec(skb
, 0, msg
->msg_iov
, copied
);
349 sock_recv_timestamp(msg
, sk
, skb
);
351 serr
= SKB_EXT_ERR(skb
);
353 sin
= (struct sockaddr_in6
*)msg
->msg_name
;
355 const unsigned char *nh
= skb_network_header(skb
);
356 sin
->sin6_family
= AF_INET6
;
357 sin
->sin6_flowinfo
= 0;
358 sin
->sin6_port
= serr
->port
;
359 if (skb
->protocol
== htons(ETH_P_IPV6
)) {
360 const struct ipv6hdr
*ip6h
= container_of((struct in6_addr
*)(nh
+ serr
->addr_offset
),
361 struct ipv6hdr
, daddr
);
362 sin
->sin6_addr
= ip6h
->daddr
;
364 sin
->sin6_flowinfo
= ip6_flowinfo(ip6h
);
366 ipv6_iface_scope_id(&sin
->sin6_addr
,
369 ipv6_addr_set_v4mapped(*(__be32
*)(nh
+ serr
->addr_offset
),
371 sin
->sin6_scope_id
= 0;
373 *addr_len
= sizeof(*sin
);
376 memcpy(&errhdr
.ee
, &serr
->ee
, sizeof(struct sock_extended_err
));
377 sin
= &errhdr
.offender
;
378 memset(sin
, 0, sizeof(*sin
));
380 if (serr
->ee
.ee_origin
!= SO_EE_ORIGIN_LOCAL
) {
381 sin
->sin6_family
= AF_INET6
;
382 if (skb
->protocol
== htons(ETH_P_IPV6
)) {
383 sin
->sin6_addr
= ipv6_hdr(skb
)->saddr
;
385 ip6_datagram_recv_ctl(sk
, msg
, skb
);
387 ipv6_iface_scope_id(&sin
->sin6_addr
,
390 ipv6_addr_set_v4mapped(ip_hdr(skb
)->saddr
,
392 if (inet_sk(sk
)->cmsg_flags
)
393 ip_cmsg_recv(msg
, skb
);
397 put_cmsg(msg
, SOL_IPV6
, IPV6_RECVERR
, sizeof(errhdr
), &errhdr
);
399 /* Now we could try to dump offended packet options */
401 msg
->msg_flags
|= MSG_ERRQUEUE
;
404 /* Reset and regenerate socket error */
405 spin_lock_bh(&sk
->sk_error_queue
.lock
);
407 if ((skb2
= skb_peek(&sk
->sk_error_queue
)) != NULL
) {
408 sk
->sk_err
= SKB_EXT_ERR(skb2
)->ee
.ee_errno
;
409 spin_unlock_bh(&sk
->sk_error_queue
.lock
);
410 sk
->sk_error_report(sk
);
412 spin_unlock_bh(&sk
->sk_error_queue
.lock
);
420 EXPORT_SYMBOL_GPL(ipv6_recv_error
);
423 * Handle IPV6_RECVPATHMTU
425 int ipv6_recv_rxpmtu(struct sock
*sk
, struct msghdr
*msg
, int len
,
428 struct ipv6_pinfo
*np
= inet6_sk(sk
);
430 struct sockaddr_in6
*sin
;
431 struct ip6_mtuinfo mtu_info
;
436 skb
= xchg(&np
->rxpmtu
, NULL
);
442 msg
->msg_flags
|= MSG_TRUNC
;
445 err
= skb_copy_datagram_iovec(skb
, 0, msg
->msg_iov
, copied
);
449 sock_recv_timestamp(msg
, sk
, skb
);
451 memcpy(&mtu_info
, IP6CBMTU(skb
), sizeof(mtu_info
));
453 sin
= (struct sockaddr_in6
*)msg
->msg_name
;
455 sin
->sin6_family
= AF_INET6
;
456 sin
->sin6_flowinfo
= 0;
458 sin
->sin6_scope_id
= mtu_info
.ip6m_addr
.sin6_scope_id
;
459 sin
->sin6_addr
= mtu_info
.ip6m_addr
.sin6_addr
;
460 *addr_len
= sizeof(*sin
);
463 put_cmsg(msg
, SOL_IPV6
, IPV6_PATHMTU
, sizeof(mtu_info
), &mtu_info
);
474 int ip6_datagram_recv_ctl(struct sock
*sk
, struct msghdr
*msg
,
477 struct ipv6_pinfo
*np
= inet6_sk(sk
);
478 struct inet6_skb_parm
*opt
= IP6CB(skb
);
479 unsigned char *nh
= skb_network_header(skb
);
481 if (np
->rxopt
.bits
.rxinfo
) {
482 struct in6_pktinfo src_info
;
484 src_info
.ipi6_ifindex
= opt
->iif
;
485 src_info
.ipi6_addr
= ipv6_hdr(skb
)->daddr
;
486 put_cmsg(msg
, SOL_IPV6
, IPV6_PKTINFO
, sizeof(src_info
), &src_info
);
489 if (np
->rxopt
.bits
.rxhlim
) {
490 int hlim
= ipv6_hdr(skb
)->hop_limit
;
491 put_cmsg(msg
, SOL_IPV6
, IPV6_HOPLIMIT
, sizeof(hlim
), &hlim
);
494 if (np
->rxopt
.bits
.rxtclass
) {
495 int tclass
= ipv6_get_dsfield(ipv6_hdr(skb
));
496 put_cmsg(msg
, SOL_IPV6
, IPV6_TCLASS
, sizeof(tclass
), &tclass
);
499 if (np
->rxopt
.bits
.rxflow
) {
500 __be32 flowinfo
= ip6_flowinfo((struct ipv6hdr
*)nh
);
502 put_cmsg(msg
, SOL_IPV6
, IPV6_FLOWINFO
, sizeof(flowinfo
), &flowinfo
);
505 /* HbH is allowed only once */
506 if (np
->rxopt
.bits
.hopopts
&& opt
->hop
) {
507 u8
*ptr
= nh
+ opt
->hop
;
508 put_cmsg(msg
, SOL_IPV6
, IPV6_HOPOPTS
, (ptr
[1]+1)<<3, ptr
);
512 (np
->rxopt
.bits
.dstopts
|| np
->rxopt
.bits
.srcrt
)) {
514 * Silly enough, but we need to reparse in order to
515 * report extension headers (except for HbH)
518 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT
519 * (and WILL NOT be) defined because
520 * IPV6_RECVDSTOPTS is more generic. --yoshfuji
522 unsigned int off
= sizeof(struct ipv6hdr
);
523 u8 nexthdr
= ipv6_hdr(skb
)->nexthdr
;
525 while (off
<= opt
->lastopt
) {
530 case IPPROTO_DSTOPTS
:
532 len
= (ptr
[1] + 1) << 3;
533 if (np
->rxopt
.bits
.dstopts
)
534 put_cmsg(msg
, SOL_IPV6
, IPV6_DSTOPTS
, len
, ptr
);
536 case IPPROTO_ROUTING
:
538 len
= (ptr
[1] + 1) << 3;
539 if (np
->rxopt
.bits
.srcrt
)
540 put_cmsg(msg
, SOL_IPV6
, IPV6_RTHDR
, len
, ptr
);
544 len
= (ptr
[1] + 2) << 2;
548 len
= (ptr
[1] + 1) << 3;
556 /* socket options in old style */
557 if (np
->rxopt
.bits
.rxoinfo
) {
558 struct in6_pktinfo src_info
;
560 src_info
.ipi6_ifindex
= opt
->iif
;
561 src_info
.ipi6_addr
= ipv6_hdr(skb
)->daddr
;
562 put_cmsg(msg
, SOL_IPV6
, IPV6_2292PKTINFO
, sizeof(src_info
), &src_info
);
564 if (np
->rxopt
.bits
.rxohlim
) {
565 int hlim
= ipv6_hdr(skb
)->hop_limit
;
566 put_cmsg(msg
, SOL_IPV6
, IPV6_2292HOPLIMIT
, sizeof(hlim
), &hlim
);
568 if (np
->rxopt
.bits
.ohopopts
&& opt
->hop
) {
569 u8
*ptr
= nh
+ opt
->hop
;
570 put_cmsg(msg
, SOL_IPV6
, IPV6_2292HOPOPTS
, (ptr
[1]+1)<<3, ptr
);
572 if (np
->rxopt
.bits
.odstopts
&& opt
->dst0
) {
573 u8
*ptr
= nh
+ opt
->dst0
;
574 put_cmsg(msg
, SOL_IPV6
, IPV6_2292DSTOPTS
, (ptr
[1]+1)<<3, ptr
);
576 if (np
->rxopt
.bits
.osrcrt
&& opt
->srcrt
) {
577 struct ipv6_rt_hdr
*rthdr
= (struct ipv6_rt_hdr
*)(nh
+ opt
->srcrt
);
578 put_cmsg(msg
, SOL_IPV6
, IPV6_2292RTHDR
, (rthdr
->hdrlen
+1) << 3, rthdr
);
580 if (np
->rxopt
.bits
.odstopts
&& opt
->dst1
) {
581 u8
*ptr
= nh
+ opt
->dst1
;
582 put_cmsg(msg
, SOL_IPV6
, IPV6_2292DSTOPTS
, (ptr
[1]+1)<<3, ptr
);
584 if (np
->rxopt
.bits
.rxorigdstaddr
) {
585 struct sockaddr_in6 sin6
;
586 __be16
*ports
= (__be16
*) skb_transport_header(skb
);
588 if (skb_transport_offset(skb
) + 4 <= skb
->len
) {
589 /* All current transport protocols have the port numbers in the
590 * first four bytes of the transport header and this function is
591 * written with this assumption in mind.
594 sin6
.sin6_family
= AF_INET6
;
595 sin6
.sin6_addr
= ipv6_hdr(skb
)->daddr
;
596 sin6
.sin6_port
= ports
[1];
597 sin6
.sin6_flowinfo
= 0;
599 ipv6_iface_scope_id(&ipv6_hdr(skb
)->daddr
,
602 put_cmsg(msg
, SOL_IPV6
, IPV6_ORIGDSTADDR
, sizeof(sin6
), &sin6
);
607 EXPORT_SYMBOL_GPL(ip6_datagram_recv_ctl
);
609 int ip6_datagram_send_ctl(struct net
*net
, struct sock
*sk
,
610 struct msghdr
*msg
, struct flowi6
*fl6
,
611 struct ipv6_txoptions
*opt
,
612 int *hlimit
, int *tclass
, int *dontfrag
)
614 struct in6_pktinfo
*src_info
;
615 struct cmsghdr
*cmsg
;
616 struct ipv6_rt_hdr
*rthdr
;
617 struct ipv6_opt_hdr
*hdr
;
621 for (cmsg
= CMSG_FIRSTHDR(msg
); cmsg
; cmsg
= CMSG_NXTHDR(msg
, cmsg
)) {
624 if (!CMSG_OK(msg
, cmsg
)) {
629 if (cmsg
->cmsg_level
!= SOL_IPV6
)
632 switch (cmsg
->cmsg_type
) {
634 case IPV6_2292PKTINFO
:
636 struct net_device
*dev
= NULL
;
638 if (cmsg
->cmsg_len
< CMSG_LEN(sizeof(struct in6_pktinfo
))) {
643 src_info
= (struct in6_pktinfo
*)CMSG_DATA(cmsg
);
645 if (src_info
->ipi6_ifindex
) {
646 if (fl6
->flowi6_oif
&&
647 src_info
->ipi6_ifindex
!= fl6
->flowi6_oif
)
649 fl6
->flowi6_oif
= src_info
->ipi6_ifindex
;
652 addr_type
= __ipv6_addr_type(&src_info
->ipi6_addr
);
655 if (fl6
->flowi6_oif
) {
656 dev
= dev_get_by_index_rcu(net
, fl6
->flowi6_oif
);
661 } else if (addr_type
& IPV6_ADDR_LINKLOCAL
) {
666 if (addr_type
!= IPV6_ADDR_ANY
) {
667 int strict
= __ipv6_addr_src_scope(addr_type
) <= IPV6_ADDR_SCOPE_LINKLOCAL
;
668 if (!(inet_sk(sk
)->freebind
|| inet_sk(sk
)->transparent
) &&
669 !ipv6_chk_addr(net
, &src_info
->ipi6_addr
,
670 strict
? dev
: NULL
, 0))
673 fl6
->saddr
= src_info
->ipi6_addr
;
685 if (cmsg
->cmsg_len
< CMSG_LEN(4)) {
690 if (fl6
->flowlabel
&IPV6_FLOWINFO_MASK
) {
691 if ((fl6
->flowlabel
^*(__be32
*)CMSG_DATA(cmsg
))&~IPV6_FLOWINFO_MASK
) {
696 fl6
->flowlabel
= IPV6_FLOWINFO_MASK
& *(__be32
*)CMSG_DATA(cmsg
);
699 case IPV6_2292HOPOPTS
:
701 if (opt
->hopopt
|| cmsg
->cmsg_len
< CMSG_LEN(sizeof(struct ipv6_opt_hdr
))) {
706 hdr
= (struct ipv6_opt_hdr
*)CMSG_DATA(cmsg
);
707 len
= ((hdr
->hdrlen
+ 1) << 3);
708 if (cmsg
->cmsg_len
< CMSG_LEN(len
)) {
712 if (!ns_capable(net
->user_ns
, CAP_NET_RAW
)) {
716 opt
->opt_nflen
+= len
;
720 case IPV6_2292DSTOPTS
:
721 if (cmsg
->cmsg_len
< CMSG_LEN(sizeof(struct ipv6_opt_hdr
))) {
726 hdr
= (struct ipv6_opt_hdr
*)CMSG_DATA(cmsg
);
727 len
= ((hdr
->hdrlen
+ 1) << 3);
728 if (cmsg
->cmsg_len
< CMSG_LEN(len
)) {
732 if (!ns_capable(net
->user_ns
, CAP_NET_RAW
)) {
740 opt
->opt_flen
+= len
;
745 case IPV6_RTHDRDSTOPTS
:
746 if (cmsg
->cmsg_len
< CMSG_LEN(sizeof(struct ipv6_opt_hdr
))) {
751 hdr
= (struct ipv6_opt_hdr
*)CMSG_DATA(cmsg
);
752 len
= ((hdr
->hdrlen
+ 1) << 3);
753 if (cmsg
->cmsg_len
< CMSG_LEN(len
)) {
757 if (!ns_capable(net
->user_ns
, CAP_NET_RAW
)) {
761 if (cmsg
->cmsg_type
== IPV6_DSTOPTS
) {
762 opt
->opt_flen
+= len
;
765 opt
->opt_nflen
+= len
;
772 if (cmsg
->cmsg_len
< CMSG_LEN(sizeof(struct ipv6_rt_hdr
))) {
777 rthdr
= (struct ipv6_rt_hdr
*)CMSG_DATA(cmsg
);
779 switch (rthdr
->type
) {
780 #if IS_ENABLED(CONFIG_IPV6_MIP6)
781 case IPV6_SRCRT_TYPE_2
:
782 if (rthdr
->hdrlen
!= 2 ||
783 rthdr
->segments_left
!= 1) {
794 len
= ((rthdr
->hdrlen
+ 1) << 3);
796 if (cmsg
->cmsg_len
< CMSG_LEN(len
)) {
801 /* segments left must also match */
802 if ((rthdr
->hdrlen
>> 1) != rthdr
->segments_left
) {
807 opt
->opt_nflen
+= len
;
810 if (cmsg
->cmsg_type
== IPV6_2292RTHDR
&& opt
->dst1opt
) {
811 int dsthdrlen
= ((opt
->dst1opt
->hdrlen
+1)<<3);
813 opt
->opt_nflen
+= dsthdrlen
;
814 opt
->dst0opt
= opt
->dst1opt
;
816 opt
->opt_flen
-= dsthdrlen
;
821 case IPV6_2292HOPLIMIT
:
823 if (cmsg
->cmsg_len
!= CMSG_LEN(sizeof(int))) {
828 *hlimit
= *(int *)CMSG_DATA(cmsg
);
829 if (*hlimit
< -1 || *hlimit
> 0xff) {
841 if (cmsg
->cmsg_len
!= CMSG_LEN(sizeof(int)))
844 tc
= *(int *)CMSG_DATA(cmsg
);
845 if (tc
< -1 || tc
> 0xff)
859 if (cmsg
->cmsg_len
!= CMSG_LEN(sizeof(int)))
862 df
= *(int *)CMSG_DATA(cmsg
);
863 if (df
< 0 || df
> 1)
872 LIMIT_NETDEBUG(KERN_DEBUG
"invalid cmsg type: %d\n",
882 EXPORT_SYMBOL_GPL(ip6_datagram_send_ctl
);
884 void ip6_dgram_sock_seq_show(struct seq_file
*seq
, struct sock
*sp
,
885 __u16 srcp
, __u16 destp
, int bucket
)
887 struct ipv6_pinfo
*np
= inet6_sk(sp
);
888 const struct in6_addr
*dest
, *src
;
891 src
= &np
->rcv_saddr
;
893 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
894 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %d\n",
896 src
->s6_addr32
[0], src
->s6_addr32
[1],
897 src
->s6_addr32
[2], src
->s6_addr32
[3], srcp
,
898 dest
->s6_addr32
[0], dest
->s6_addr32
[1],
899 dest
->s6_addr32
[2], dest
->s6_addr32
[3], destp
,
901 sk_wmem_alloc_get(sp
),
902 sk_rmem_alloc_get(sp
),
904 from_kuid_munged(seq_user_ns(seq
), sock_i_uid(sp
)),
907 atomic_read(&sp
->sk_refcnt
), sp
,
908 atomic_read(&sp
->sk_drops
));