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
)
79 addr_type
= ipv6_addr_type(&usin
->sin6_addr
);
81 if (addr_type
== IPV6_ADDR_ANY
) {
85 usin
->sin6_addr
.s6_addr
[15] = 0x01;
88 daddr
= &usin
->sin6_addr
;
90 if (addr_type
== IPV6_ADDR_MAPPED
) {
91 struct sockaddr_in sin
;
93 if (__ipv6_only_sock(sk
)) {
97 sin
.sin_family
= AF_INET
;
98 sin
.sin_addr
.s_addr
= daddr
->s6_addr32
[3];
99 sin
.sin_port
= usin
->sin6_port
;
101 err
= ip4_datagram_connect(sk
,
102 (struct sockaddr
*) &sin
,
109 ipv6_addr_set_v4mapped(inet
->inet_daddr
, &sk
->sk_v6_daddr
);
111 if (ipv6_addr_any(&np
->saddr
) ||
112 ipv6_mapped_addr_any(&np
->saddr
))
113 ipv6_addr_set_v4mapped(inet
->inet_saddr
, &np
->saddr
);
115 if (ipv6_addr_any(&sk
->sk_v6_rcv_saddr
) ||
116 ipv6_mapped_addr_any(&sk
->sk_v6_rcv_saddr
)) {
117 ipv6_addr_set_v4mapped(inet
->inet_rcv_saddr
,
118 &sk
->sk_v6_rcv_saddr
);
119 if (sk
->sk_prot
->rehash
)
120 sk
->sk_prot
->rehash(sk
);
126 if (__ipv6_addr_needs_scope_id(addr_type
)) {
127 if (addr_len
>= sizeof(struct sockaddr_in6
) &&
128 usin
->sin6_scope_id
) {
129 if (sk
->sk_bound_dev_if
&&
130 sk
->sk_bound_dev_if
!= usin
->sin6_scope_id
) {
134 sk
->sk_bound_dev_if
= usin
->sin6_scope_id
;
137 if (!sk
->sk_bound_dev_if
&& (addr_type
& IPV6_ADDR_MULTICAST
))
138 sk
->sk_bound_dev_if
= np
->mcast_oif
;
140 /* Connect to link-local address requires an interface */
141 if (!sk
->sk_bound_dev_if
) {
147 sk
->sk_v6_daddr
= *daddr
;
148 np
->flow_label
= fl6
.flowlabel
;
150 inet
->inet_dport
= usin
->sin6_port
;
153 * Check for a route to destination an obtain the
154 * destination cache for it.
157 fl6
.flowi6_proto
= sk
->sk_protocol
;
158 fl6
.daddr
= sk
->sk_v6_daddr
;
159 fl6
.saddr
= np
->saddr
;
160 fl6
.flowi6_oif
= sk
->sk_bound_dev_if
;
161 fl6
.flowi6_mark
= sk
->sk_mark
;
162 fl6
.fl6_dport
= inet
->inet_dport
;
163 fl6
.fl6_sport
= inet
->inet_sport
;
165 if (!fl6
.flowi6_oif
&& (addr_type
&IPV6_ADDR_MULTICAST
))
166 fl6
.flowi6_oif
= np
->mcast_oif
;
168 security_sk_classify_flow(sk
, flowi6_to_flowi(&fl6
));
170 opt
= flowlabel
? flowlabel
->opt
: np
->opt
;
171 final_p
= fl6_update_dst(&fl6
, opt
, &final
);
173 dst
= ip6_dst_lookup_flow(sk
, &fl6
, final_p
);
180 /* source address lookup done in ip6_dst_lookup */
182 if (ipv6_addr_any(&np
->saddr
))
183 np
->saddr
= fl6
.saddr
;
185 if (ipv6_addr_any(&sk
->sk_v6_rcv_saddr
)) {
186 sk
->sk_v6_rcv_saddr
= fl6
.saddr
;
187 inet
->inet_rcv_saddr
= LOOPBACK4_IPV6
;
188 if (sk
->sk_prot
->rehash
)
189 sk
->sk_prot
->rehash(sk
);
192 ip6_dst_store(sk
, dst
,
193 ipv6_addr_equal(&fl6
.daddr
, &sk
->sk_v6_daddr
) ?
194 &sk
->sk_v6_daddr
: NULL
,
195 #ifdef CONFIG_IPV6_SUBTREES
196 ipv6_addr_equal(&fl6
.saddr
, &np
->saddr
) ?
201 sk
->sk_state
= TCP_ESTABLISHED
;
204 fl6_sock_release(flowlabel
);
207 EXPORT_SYMBOL_GPL(ip6_datagram_connect
);
209 int ip6_datagram_connect_v6_only(struct sock
*sk
, struct sockaddr
*uaddr
,
212 DECLARE_SOCKADDR(struct sockaddr_in6
*, sin6
, uaddr
);
213 if (sin6
->sin6_family
!= AF_INET6
)
214 return -EAFNOSUPPORT
;
215 return ip6_datagram_connect(sk
, uaddr
, addr_len
);
217 EXPORT_SYMBOL_GPL(ip6_datagram_connect_v6_only
);
219 void ipv6_icmp_error(struct sock
*sk
, struct sk_buff
*skb
, int err
,
220 __be16 port
, u32 info
, u8
*payload
)
222 struct ipv6_pinfo
*np
= inet6_sk(sk
);
223 struct icmp6hdr
*icmph
= icmp6_hdr(skb
);
224 struct sock_exterr_skb
*serr
;
229 skb
= skb_clone(skb
, GFP_ATOMIC
);
233 skb
->protocol
= htons(ETH_P_IPV6
);
235 serr
= SKB_EXT_ERR(skb
);
236 serr
->ee
.ee_errno
= err
;
237 serr
->ee
.ee_origin
= SO_EE_ORIGIN_ICMP6
;
238 serr
->ee
.ee_type
= icmph
->icmp6_type
;
239 serr
->ee
.ee_code
= icmph
->icmp6_code
;
241 serr
->ee
.ee_info
= info
;
242 serr
->ee
.ee_data
= 0;
243 serr
->addr_offset
= (u8
*)&(((struct ipv6hdr
*)(icmph
+ 1))->daddr
) -
244 skb_network_header(skb
);
247 __skb_pull(skb
, payload
- skb
->data
);
248 skb_reset_transport_header(skb
);
250 if (sock_queue_err_skb(sk
, skb
))
254 void ipv6_local_error(struct sock
*sk
, int err
, struct flowi6
*fl6
, u32 info
)
256 struct ipv6_pinfo
*np
= inet6_sk(sk
);
257 struct sock_exterr_skb
*serr
;
264 skb
= alloc_skb(sizeof(struct ipv6hdr
), GFP_ATOMIC
);
268 skb
->protocol
= htons(ETH_P_IPV6
);
270 skb_put(skb
, sizeof(struct ipv6hdr
));
271 skb_reset_network_header(skb
);
273 iph
->daddr
= fl6
->daddr
;
275 serr
= SKB_EXT_ERR(skb
);
276 serr
->ee
.ee_errno
= err
;
277 serr
->ee
.ee_origin
= SO_EE_ORIGIN_LOCAL
;
278 serr
->ee
.ee_type
= 0;
279 serr
->ee
.ee_code
= 0;
281 serr
->ee
.ee_info
= info
;
282 serr
->ee
.ee_data
= 0;
283 serr
->addr_offset
= (u8
*)&iph
->daddr
- skb_network_header(skb
);
284 serr
->port
= fl6
->fl6_dport
;
286 __skb_pull(skb
, skb_tail_pointer(skb
) - skb
->data
);
287 skb_reset_transport_header(skb
);
289 if (sock_queue_err_skb(sk
, skb
))
293 void ipv6_local_rxpmtu(struct sock
*sk
, struct flowi6
*fl6
, u32 mtu
)
295 struct ipv6_pinfo
*np
= inet6_sk(sk
);
298 struct ip6_mtuinfo
*mtu_info
;
300 if (!np
->rxopt
.bits
.rxpmtu
)
303 skb
= alloc_skb(sizeof(struct ipv6hdr
), GFP_ATOMIC
);
307 skb_put(skb
, sizeof(struct ipv6hdr
));
308 skb_reset_network_header(skb
);
310 iph
->daddr
= fl6
->daddr
;
312 mtu_info
= IP6CBMTU(skb
);
314 mtu_info
->ip6m_mtu
= mtu
;
315 mtu_info
->ip6m_addr
.sin6_family
= AF_INET6
;
316 mtu_info
->ip6m_addr
.sin6_port
= 0;
317 mtu_info
->ip6m_addr
.sin6_flowinfo
= 0;
318 mtu_info
->ip6m_addr
.sin6_scope_id
= fl6
->flowi6_oif
;
319 mtu_info
->ip6m_addr
.sin6_addr
= ipv6_hdr(skb
)->daddr
;
321 __skb_pull(skb
, skb_tail_pointer(skb
) - skb
->data
);
322 skb_reset_transport_header(skb
);
324 skb
= xchg(&np
->rxpmtu
, skb
);
329 * Handle MSG_ERRQUEUE
331 int ipv6_recv_error(struct sock
*sk
, struct msghdr
*msg
, int len
, int *addr_len
)
333 struct ipv6_pinfo
*np
= inet6_sk(sk
);
334 struct sock_exterr_skb
*serr
;
336 DECLARE_SOCKADDR(struct sockaddr_in6
*, sin
, msg
->msg_name
);
338 struct sock_extended_err ee
;
339 struct sockaddr_in6 offender
;
345 skb
= sock_dequeue_err_skb(sk
);
351 msg
->msg_flags
|= MSG_TRUNC
;
354 err
= skb_copy_datagram_iovec(skb
, 0, msg
->msg_iov
, copied
);
358 sock_recv_timestamp(msg
, sk
, skb
);
360 serr
= SKB_EXT_ERR(skb
);
363 const unsigned char *nh
= skb_network_header(skb
);
364 sin
->sin6_family
= AF_INET6
;
365 sin
->sin6_flowinfo
= 0;
366 sin
->sin6_port
= serr
->port
;
367 if (skb
->protocol
== htons(ETH_P_IPV6
)) {
368 const struct ipv6hdr
*ip6h
= container_of((struct in6_addr
*)(nh
+ serr
->addr_offset
),
369 struct ipv6hdr
, daddr
);
370 sin
->sin6_addr
= ip6h
->daddr
;
372 sin
->sin6_flowinfo
= ip6_flowinfo(ip6h
);
374 ipv6_iface_scope_id(&sin
->sin6_addr
,
377 ipv6_addr_set_v4mapped(*(__be32
*)(nh
+ serr
->addr_offset
),
379 sin
->sin6_scope_id
= 0;
381 *addr_len
= sizeof(*sin
);
384 memcpy(&errhdr
.ee
, &serr
->ee
, sizeof(struct sock_extended_err
));
385 sin
= &errhdr
.offender
;
386 sin
->sin6_family
= AF_UNSPEC
;
387 if (serr
->ee
.ee_origin
!= SO_EE_ORIGIN_LOCAL
) {
388 sin
->sin6_family
= AF_INET6
;
389 sin
->sin6_flowinfo
= 0;
392 ip6_datagram_recv_common_ctl(sk
, msg
, skb
);
393 if (skb
->protocol
== htons(ETH_P_IPV6
)) {
394 sin
->sin6_addr
= ipv6_hdr(skb
)->saddr
;
396 ip6_datagram_recv_specific_ctl(sk
, msg
, skb
);
398 ipv6_iface_scope_id(&sin
->sin6_addr
,
401 struct inet_sock
*inet
= inet_sk(sk
);
403 ipv6_addr_set_v4mapped(ip_hdr(skb
)->saddr
,
405 sin
->sin6_scope_id
= 0;
406 if (inet
->cmsg_flags
)
407 ip_cmsg_recv(msg
, skb
);
411 put_cmsg(msg
, SOL_IPV6
, IPV6_RECVERR
, sizeof(errhdr
), &errhdr
);
413 /* Now we could try to dump offended packet options */
415 msg
->msg_flags
|= MSG_ERRQUEUE
;
423 EXPORT_SYMBOL_GPL(ipv6_recv_error
);
426 * Handle IPV6_RECVPATHMTU
428 int ipv6_recv_rxpmtu(struct sock
*sk
, struct msghdr
*msg
, int len
,
431 struct ipv6_pinfo
*np
= inet6_sk(sk
);
433 struct ip6_mtuinfo mtu_info
;
434 DECLARE_SOCKADDR(struct sockaddr_in6
*, sin
, msg
->msg_name
);
439 skb
= xchg(&np
->rxpmtu
, NULL
);
445 msg
->msg_flags
|= MSG_TRUNC
;
448 err
= skb_copy_datagram_iovec(skb
, 0, msg
->msg_iov
, copied
);
452 sock_recv_timestamp(msg
, sk
, skb
);
454 memcpy(&mtu_info
, IP6CBMTU(skb
), sizeof(mtu_info
));
457 sin
->sin6_family
= AF_INET6
;
458 sin
->sin6_flowinfo
= 0;
460 sin
->sin6_scope_id
= mtu_info
.ip6m_addr
.sin6_scope_id
;
461 sin
->sin6_addr
= mtu_info
.ip6m_addr
.sin6_addr
;
462 *addr_len
= sizeof(*sin
);
465 put_cmsg(msg
, SOL_IPV6
, IPV6_PATHMTU
, sizeof(mtu_info
), &mtu_info
);
476 void ip6_datagram_recv_common_ctl(struct sock
*sk
, struct msghdr
*msg
,
479 struct ipv6_pinfo
*np
= inet6_sk(sk
);
480 bool is_ipv6
= skb
->protocol
== htons(ETH_P_IPV6
);
482 if (np
->rxopt
.bits
.rxinfo
) {
483 struct in6_pktinfo src_info
;
486 src_info
.ipi6_ifindex
= IP6CB(skb
)->iif
;
487 src_info
.ipi6_addr
= ipv6_hdr(skb
)->daddr
;
489 src_info
.ipi6_ifindex
=
490 PKTINFO_SKB_CB(skb
)->ipi_ifindex
;
491 ipv6_addr_set_v4mapped(ip_hdr(skb
)->daddr
,
492 &src_info
.ipi6_addr
);
494 put_cmsg(msg
, SOL_IPV6
, IPV6_PKTINFO
, sizeof(src_info
), &src_info
);
498 void ip6_datagram_recv_specific_ctl(struct sock
*sk
, struct msghdr
*msg
,
501 struct ipv6_pinfo
*np
= inet6_sk(sk
);
502 struct inet6_skb_parm
*opt
= IP6CB(skb
);
503 unsigned char *nh
= skb_network_header(skb
);
505 if (np
->rxopt
.bits
.rxhlim
) {
506 int hlim
= ipv6_hdr(skb
)->hop_limit
;
507 put_cmsg(msg
, SOL_IPV6
, IPV6_HOPLIMIT
, sizeof(hlim
), &hlim
);
510 if (np
->rxopt
.bits
.rxtclass
) {
511 int tclass
= ipv6_get_dsfield(ipv6_hdr(skb
));
512 put_cmsg(msg
, SOL_IPV6
, IPV6_TCLASS
, sizeof(tclass
), &tclass
);
515 if (np
->rxopt
.bits
.rxflow
) {
516 __be32 flowinfo
= ip6_flowinfo((struct ipv6hdr
*)nh
);
518 put_cmsg(msg
, SOL_IPV6
, IPV6_FLOWINFO
, sizeof(flowinfo
), &flowinfo
);
521 /* HbH is allowed only once */
522 if (np
->rxopt
.bits
.hopopts
&& opt
->hop
) {
523 u8
*ptr
= nh
+ opt
->hop
;
524 put_cmsg(msg
, SOL_IPV6
, IPV6_HOPOPTS
, (ptr
[1]+1)<<3, ptr
);
528 (np
->rxopt
.bits
.dstopts
|| np
->rxopt
.bits
.srcrt
)) {
530 * Silly enough, but we need to reparse in order to
531 * report extension headers (except for HbH)
534 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT
535 * (and WILL NOT be) defined because
536 * IPV6_RECVDSTOPTS is more generic. --yoshfuji
538 unsigned int off
= sizeof(struct ipv6hdr
);
539 u8 nexthdr
= ipv6_hdr(skb
)->nexthdr
;
541 while (off
<= opt
->lastopt
) {
546 case IPPROTO_DSTOPTS
:
548 len
= (ptr
[1] + 1) << 3;
549 if (np
->rxopt
.bits
.dstopts
)
550 put_cmsg(msg
, SOL_IPV6
, IPV6_DSTOPTS
, len
, ptr
);
552 case IPPROTO_ROUTING
:
554 len
= (ptr
[1] + 1) << 3;
555 if (np
->rxopt
.bits
.srcrt
)
556 put_cmsg(msg
, SOL_IPV6
, IPV6_RTHDR
, len
, ptr
);
560 len
= (ptr
[1] + 2) << 2;
564 len
= (ptr
[1] + 1) << 3;
572 /* socket options in old style */
573 if (np
->rxopt
.bits
.rxoinfo
) {
574 struct in6_pktinfo src_info
;
576 src_info
.ipi6_ifindex
= opt
->iif
;
577 src_info
.ipi6_addr
= ipv6_hdr(skb
)->daddr
;
578 put_cmsg(msg
, SOL_IPV6
, IPV6_2292PKTINFO
, sizeof(src_info
), &src_info
);
580 if (np
->rxopt
.bits
.rxohlim
) {
581 int hlim
= ipv6_hdr(skb
)->hop_limit
;
582 put_cmsg(msg
, SOL_IPV6
, IPV6_2292HOPLIMIT
, sizeof(hlim
), &hlim
);
584 if (np
->rxopt
.bits
.ohopopts
&& opt
->hop
) {
585 u8
*ptr
= nh
+ opt
->hop
;
586 put_cmsg(msg
, SOL_IPV6
, IPV6_2292HOPOPTS
, (ptr
[1]+1)<<3, ptr
);
588 if (np
->rxopt
.bits
.odstopts
&& opt
->dst0
) {
589 u8
*ptr
= nh
+ opt
->dst0
;
590 put_cmsg(msg
, SOL_IPV6
, IPV6_2292DSTOPTS
, (ptr
[1]+1)<<3, ptr
);
592 if (np
->rxopt
.bits
.osrcrt
&& opt
->srcrt
) {
593 struct ipv6_rt_hdr
*rthdr
= (struct ipv6_rt_hdr
*)(nh
+ opt
->srcrt
);
594 put_cmsg(msg
, SOL_IPV6
, IPV6_2292RTHDR
, (rthdr
->hdrlen
+1) << 3, rthdr
);
596 if (np
->rxopt
.bits
.odstopts
&& opt
->dst1
) {
597 u8
*ptr
= nh
+ opt
->dst1
;
598 put_cmsg(msg
, SOL_IPV6
, IPV6_2292DSTOPTS
, (ptr
[1]+1)<<3, ptr
);
600 if (np
->rxopt
.bits
.rxorigdstaddr
) {
601 struct sockaddr_in6 sin6
;
602 __be16
*ports
= (__be16
*) skb_transport_header(skb
);
604 if (skb_transport_offset(skb
) + 4 <= skb
->len
) {
605 /* All current transport protocols have the port numbers in the
606 * first four bytes of the transport header and this function is
607 * written with this assumption in mind.
610 sin6
.sin6_family
= AF_INET6
;
611 sin6
.sin6_addr
= ipv6_hdr(skb
)->daddr
;
612 sin6
.sin6_port
= ports
[1];
613 sin6
.sin6_flowinfo
= 0;
615 ipv6_iface_scope_id(&ipv6_hdr(skb
)->daddr
,
618 put_cmsg(msg
, SOL_IPV6
, IPV6_ORIGDSTADDR
, sizeof(sin6
), &sin6
);
623 void ip6_datagram_recv_ctl(struct sock
*sk
, struct msghdr
*msg
,
626 ip6_datagram_recv_common_ctl(sk
, msg
, skb
);
627 ip6_datagram_recv_specific_ctl(sk
, msg
, skb
);
629 EXPORT_SYMBOL_GPL(ip6_datagram_recv_ctl
);
631 int ip6_datagram_send_ctl(struct net
*net
, struct sock
*sk
,
632 struct msghdr
*msg
, struct flowi6
*fl6
,
633 struct ipv6_txoptions
*opt
,
634 int *hlimit
, int *tclass
, int *dontfrag
)
636 struct in6_pktinfo
*src_info
;
637 struct cmsghdr
*cmsg
;
638 struct ipv6_rt_hdr
*rthdr
;
639 struct ipv6_opt_hdr
*hdr
;
643 for (cmsg
= CMSG_FIRSTHDR(msg
); cmsg
; cmsg
= CMSG_NXTHDR(msg
, cmsg
)) {
646 if (!CMSG_OK(msg
, cmsg
)) {
651 if (cmsg
->cmsg_level
!= SOL_IPV6
)
654 switch (cmsg
->cmsg_type
) {
656 case IPV6_2292PKTINFO
:
658 struct net_device
*dev
= NULL
;
660 if (cmsg
->cmsg_len
< CMSG_LEN(sizeof(struct in6_pktinfo
))) {
665 src_info
= (struct in6_pktinfo
*)CMSG_DATA(cmsg
);
667 if (src_info
->ipi6_ifindex
) {
668 if (fl6
->flowi6_oif
&&
669 src_info
->ipi6_ifindex
!= fl6
->flowi6_oif
)
671 fl6
->flowi6_oif
= src_info
->ipi6_ifindex
;
674 addr_type
= __ipv6_addr_type(&src_info
->ipi6_addr
);
677 if (fl6
->flowi6_oif
) {
678 dev
= dev_get_by_index_rcu(net
, fl6
->flowi6_oif
);
683 } else if (addr_type
& IPV6_ADDR_LINKLOCAL
) {
688 if (addr_type
!= IPV6_ADDR_ANY
) {
689 int strict
= __ipv6_addr_src_scope(addr_type
) <= IPV6_ADDR_SCOPE_LINKLOCAL
;
690 if (!(inet_sk(sk
)->freebind
|| inet_sk(sk
)->transparent
) &&
691 !ipv6_chk_addr(net
, &src_info
->ipi6_addr
,
692 strict
? dev
: NULL
, 0) &&
693 !ipv6_chk_acast_addr_src(net
, dev
,
694 &src_info
->ipi6_addr
))
697 fl6
->saddr
= src_info
->ipi6_addr
;
709 if (cmsg
->cmsg_len
< CMSG_LEN(4)) {
714 if (fl6
->flowlabel
&IPV6_FLOWINFO_MASK
) {
715 if ((fl6
->flowlabel
^*(__be32
*)CMSG_DATA(cmsg
))&~IPV6_FLOWINFO_MASK
) {
720 fl6
->flowlabel
= IPV6_FLOWINFO_MASK
& *(__be32
*)CMSG_DATA(cmsg
);
723 case IPV6_2292HOPOPTS
:
725 if (opt
->hopopt
|| cmsg
->cmsg_len
< CMSG_LEN(sizeof(struct ipv6_opt_hdr
))) {
730 hdr
= (struct ipv6_opt_hdr
*)CMSG_DATA(cmsg
);
731 len
= ((hdr
->hdrlen
+ 1) << 3);
732 if (cmsg
->cmsg_len
< CMSG_LEN(len
)) {
736 if (!ns_capable(net
->user_ns
, CAP_NET_RAW
)) {
740 opt
->opt_nflen
+= len
;
744 case IPV6_2292DSTOPTS
:
745 if (cmsg
->cmsg_len
< CMSG_LEN(sizeof(struct ipv6_opt_hdr
))) {
750 hdr
= (struct ipv6_opt_hdr
*)CMSG_DATA(cmsg
);
751 len
= ((hdr
->hdrlen
+ 1) << 3);
752 if (cmsg
->cmsg_len
< CMSG_LEN(len
)) {
756 if (!ns_capable(net
->user_ns
, CAP_NET_RAW
)) {
764 opt
->opt_flen
+= len
;
769 case IPV6_RTHDRDSTOPTS
:
770 if (cmsg
->cmsg_len
< CMSG_LEN(sizeof(struct ipv6_opt_hdr
))) {
775 hdr
= (struct ipv6_opt_hdr
*)CMSG_DATA(cmsg
);
776 len
= ((hdr
->hdrlen
+ 1) << 3);
777 if (cmsg
->cmsg_len
< CMSG_LEN(len
)) {
781 if (!ns_capable(net
->user_ns
, CAP_NET_RAW
)) {
785 if (cmsg
->cmsg_type
== IPV6_DSTOPTS
) {
786 opt
->opt_flen
+= len
;
789 opt
->opt_nflen
+= len
;
796 if (cmsg
->cmsg_len
< CMSG_LEN(sizeof(struct ipv6_rt_hdr
))) {
801 rthdr
= (struct ipv6_rt_hdr
*)CMSG_DATA(cmsg
);
803 switch (rthdr
->type
) {
804 #if IS_ENABLED(CONFIG_IPV6_MIP6)
805 case IPV6_SRCRT_TYPE_2
:
806 if (rthdr
->hdrlen
!= 2 ||
807 rthdr
->segments_left
!= 1) {
818 len
= ((rthdr
->hdrlen
+ 1) << 3);
820 if (cmsg
->cmsg_len
< CMSG_LEN(len
)) {
825 /* segments left must also match */
826 if ((rthdr
->hdrlen
>> 1) != rthdr
->segments_left
) {
831 opt
->opt_nflen
+= len
;
834 if (cmsg
->cmsg_type
== IPV6_2292RTHDR
&& opt
->dst1opt
) {
835 int dsthdrlen
= ((opt
->dst1opt
->hdrlen
+1)<<3);
837 opt
->opt_nflen
+= dsthdrlen
;
838 opt
->dst0opt
= opt
->dst1opt
;
840 opt
->opt_flen
-= dsthdrlen
;
845 case IPV6_2292HOPLIMIT
:
847 if (cmsg
->cmsg_len
!= CMSG_LEN(sizeof(int))) {
852 *hlimit
= *(int *)CMSG_DATA(cmsg
);
853 if (*hlimit
< -1 || *hlimit
> 0xff) {
865 if (cmsg
->cmsg_len
!= CMSG_LEN(sizeof(int)))
868 tc
= *(int *)CMSG_DATA(cmsg
);
869 if (tc
< -1 || tc
> 0xff)
883 if (cmsg
->cmsg_len
!= CMSG_LEN(sizeof(int)))
886 df
= *(int *)CMSG_DATA(cmsg
);
887 if (df
< 0 || df
> 1)
896 LIMIT_NETDEBUG(KERN_DEBUG
"invalid cmsg type: %d\n",
906 EXPORT_SYMBOL_GPL(ip6_datagram_send_ctl
);
908 void ip6_dgram_sock_seq_show(struct seq_file
*seq
, struct sock
*sp
,
909 __u16 srcp
, __u16 destp
, int bucket
)
911 const struct in6_addr
*dest
, *src
;
913 dest
= &sp
->sk_v6_daddr
;
914 src
= &sp
->sk_v6_rcv_saddr
;
916 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
917 "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d\n",
919 src
->s6_addr32
[0], src
->s6_addr32
[1],
920 src
->s6_addr32
[2], src
->s6_addr32
[3], srcp
,
921 dest
->s6_addr32
[0], dest
->s6_addr32
[1],
922 dest
->s6_addr32
[2], dest
->s6_addr32
[3], destp
,
924 sk_wmem_alloc_get(sp
),
925 sk_rmem_alloc_get(sp
),
927 from_kuid_munged(seq_user_ns(seq
), sock_i_uid(sp
)),
930 atomic_read(&sp
->sk_refcnt
), sp
,
931 atomic_read(&sp
->sk_drops
));