2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
11 * Many : Split from ip.c , see ip.c for history.
12 * Martin Mares : TOS setting fixed.
13 * Alan Cox : Fixed a couple of oopses in Martin's
15 * Mike McLagan : Routing by source
18 #include <linux/module.h>
19 #include <linux/types.h>
21 #include <linux/skbuff.h>
23 #include <linux/icmp.h>
24 #include <linux/inetdevice.h>
25 #include <linux/netdevice.h>
26 #include <linux/slab.h>
30 #include <net/tcp_states.h>
31 #include <linux/udp.h>
32 #include <linux/igmp.h>
33 #include <linux/netfilter.h>
34 #include <linux/route.h>
35 #include <linux/mroute.h>
36 #include <net/inet_ecn.h>
37 #include <net/route.h>
39 #include <net/compat.h>
40 #if IS_ENABLED(CONFIG_IPV6)
41 #include <net/transp_v6.h>
43 #include <net/ip_fib.h>
45 #include <linux/errqueue.h>
46 #include <asm/uaccess.h>
48 #define IP_CMSG_PKTINFO 1
51 #define IP_CMSG_RECVOPTS 8
52 #define IP_CMSG_RETOPTS 16
53 #define IP_CMSG_PASSSEC 32
54 #define IP_CMSG_ORIGDSTADDR 64
57 * SOL_IP control messages.
59 #define PKTINFO_SKB_CB(__skb) ((struct in_pktinfo *)((__skb)->cb))
61 static void ip_cmsg_recv_pktinfo(struct msghdr
*msg
, struct sk_buff
*skb
)
63 struct in_pktinfo info
= *PKTINFO_SKB_CB(skb
);
65 info
.ipi_addr
.s_addr
= ip_hdr(skb
)->daddr
;
67 put_cmsg(msg
, SOL_IP
, IP_PKTINFO
, sizeof(info
), &info
);
70 static void ip_cmsg_recv_ttl(struct msghdr
*msg
, struct sk_buff
*skb
)
72 int ttl
= ip_hdr(skb
)->ttl
;
73 put_cmsg(msg
, SOL_IP
, IP_TTL
, sizeof(int), &ttl
);
76 static void ip_cmsg_recv_tos(struct msghdr
*msg
, struct sk_buff
*skb
)
78 put_cmsg(msg
, SOL_IP
, IP_TOS
, 1, &ip_hdr(skb
)->tos
);
81 static void ip_cmsg_recv_opts(struct msghdr
*msg
, struct sk_buff
*skb
)
83 if (IPCB(skb
)->opt
.optlen
== 0)
86 put_cmsg(msg
, SOL_IP
, IP_RECVOPTS
, IPCB(skb
)->opt
.optlen
,
91 static void ip_cmsg_recv_retopts(struct msghdr
*msg
, struct sk_buff
*skb
)
93 unsigned char optbuf
[sizeof(struct ip_options
) + 40];
94 struct ip_options
*opt
= (struct ip_options
*)optbuf
;
96 if (IPCB(skb
)->opt
.optlen
== 0)
99 if (ip_options_echo(opt
, skb
)) {
100 msg
->msg_flags
|= MSG_CTRUNC
;
103 ip_options_undo(opt
);
105 put_cmsg(msg
, SOL_IP
, IP_RETOPTS
, opt
->optlen
, opt
->__data
);
108 static void ip_cmsg_recv_security(struct msghdr
*msg
, struct sk_buff
*skb
)
114 err
= security_socket_getpeersec_dgram(NULL
, skb
, &secid
);
118 err
= security_secid_to_secctx(secid
, &secdata
, &seclen
);
122 put_cmsg(msg
, SOL_IP
, SCM_SECURITY
, seclen
, secdata
);
123 security_release_secctx(secdata
, seclen
);
126 static void ip_cmsg_recv_dstaddr(struct msghdr
*msg
, struct sk_buff
*skb
)
128 struct sockaddr_in sin
;
129 const struct iphdr
*iph
= ip_hdr(skb
);
130 __be16
*ports
= (__be16
*)skb_transport_header(skb
);
132 if (skb_transport_offset(skb
) + 4 > skb
->len
)
135 /* All current transport protocols have the port numbers in the
136 * first four bytes of the transport header and this function is
137 * written with this assumption in mind.
140 sin
.sin_family
= AF_INET
;
141 sin
.sin_addr
.s_addr
= iph
->daddr
;
142 sin
.sin_port
= ports
[1];
143 memset(sin
.sin_zero
, 0, sizeof(sin
.sin_zero
));
145 put_cmsg(msg
, SOL_IP
, IP_ORIGDSTADDR
, sizeof(sin
), &sin
);
148 void ip_cmsg_recv(struct msghdr
*msg
, struct sk_buff
*skb
)
150 struct inet_sock
*inet
= inet_sk(skb
->sk
);
151 unsigned int flags
= inet
->cmsg_flags
;
153 /* Ordered by supposed usage frequency */
155 ip_cmsg_recv_pktinfo(msg
, skb
);
156 if ((flags
>>= 1) == 0)
160 ip_cmsg_recv_ttl(msg
, skb
);
161 if ((flags
>>= 1) == 0)
165 ip_cmsg_recv_tos(msg
, skb
);
166 if ((flags
>>= 1) == 0)
170 ip_cmsg_recv_opts(msg
, skb
);
171 if ((flags
>>= 1) == 0)
175 ip_cmsg_recv_retopts(msg
, skb
);
176 if ((flags
>>= 1) == 0)
180 ip_cmsg_recv_security(msg
, skb
);
182 if ((flags
>>= 1) == 0)
185 ip_cmsg_recv_dstaddr(msg
, skb
);
188 EXPORT_SYMBOL(ip_cmsg_recv
);
190 int ip_cmsg_send(struct net
*net
, struct msghdr
*msg
, struct ipcm_cookie
*ipc
)
193 struct cmsghdr
*cmsg
;
195 for (cmsg
= CMSG_FIRSTHDR(msg
); cmsg
; cmsg
= CMSG_NXTHDR(msg
, cmsg
)) {
196 if (!CMSG_OK(msg
, cmsg
))
198 if (cmsg
->cmsg_level
!= SOL_IP
)
200 switch (cmsg
->cmsg_type
) {
202 err
= cmsg
->cmsg_len
- CMSG_ALIGN(sizeof(struct cmsghdr
));
203 err
= ip_options_get(net
, &ipc
->opt
, CMSG_DATA(cmsg
),
204 err
< 40 ? err
: 40);
210 struct in_pktinfo
*info
;
211 if (cmsg
->cmsg_len
!= CMSG_LEN(sizeof(struct in_pktinfo
)))
213 info
= (struct in_pktinfo
*)CMSG_DATA(cmsg
);
214 ipc
->oif
= info
->ipi_ifindex
;
215 ipc
->addr
= info
->ipi_spec_dst
.s_addr
;
219 if (cmsg
->cmsg_len
!= CMSG_LEN(sizeof(int)))
221 val
= *(int *)CMSG_DATA(cmsg
);
222 if (val
< 1 || val
> 255)
227 if (cmsg
->cmsg_len
!= CMSG_LEN(sizeof(int)))
229 val
= *(int *)CMSG_DATA(cmsg
);
230 if (val
< 0 || val
> 255)
233 ipc
->priority
= rt_tos2priority(ipc
->tos
);
244 /* Special input handler for packets caught by router alert option.
245 They are selected only by protocol field, and then processed likely
246 local ones; but only if someone wants them! Otherwise, router
247 not running rsvpd will kill RSVP.
249 It is user level problem, what it will make with them.
250 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
251 but receiver should be enough clever f.e. to forward mtrace requests,
252 sent to multicast group to reach destination designated router.
254 struct ip_ra_chain __rcu
*ip_ra_chain
;
255 static DEFINE_SPINLOCK(ip_ra_lock
);
258 static void ip_ra_destroy_rcu(struct rcu_head
*head
)
260 struct ip_ra_chain
*ra
= container_of(head
, struct ip_ra_chain
, rcu
);
262 sock_put(ra
->saved_sk
);
266 int ip_ra_control(struct sock
*sk
, unsigned char on
,
267 void (*destructor
)(struct sock
*))
269 struct ip_ra_chain
*ra
, *new_ra
;
270 struct ip_ra_chain __rcu
**rap
;
272 if (sk
->sk_type
!= SOCK_RAW
|| inet_sk(sk
)->inet_num
== IPPROTO_RAW
)
275 new_ra
= on
? kmalloc(sizeof(*new_ra
), GFP_KERNEL
) : NULL
;
277 spin_lock_bh(&ip_ra_lock
);
278 for (rap
= &ip_ra_chain
;
279 (ra
= rcu_dereference_protected(*rap
,
280 lockdep_is_held(&ip_ra_lock
))) != NULL
;
284 spin_unlock_bh(&ip_ra_lock
);
288 /* dont let ip_call_ra_chain() use sk again */
290 rcu_assign_pointer(*rap
, ra
->next
);
291 spin_unlock_bh(&ip_ra_lock
);
296 * Delay sock_put(sk) and kfree(ra) after one rcu grace
297 * period. This guarantee ip_call_ra_chain() dont need
298 * to mess with socket refcounts.
301 call_rcu(&ra
->rcu
, ip_ra_destroy_rcu
);
305 if (new_ra
== NULL
) {
306 spin_unlock_bh(&ip_ra_lock
);
310 new_ra
->destructor
= destructor
;
313 rcu_assign_pointer(*rap
, new_ra
);
315 spin_unlock_bh(&ip_ra_lock
);
320 void ip_icmp_error(struct sock
*sk
, struct sk_buff
*skb
, int err
,
321 __be16 port
, u32 info
, u8
*payload
)
323 struct sock_exterr_skb
*serr
;
325 skb
= skb_clone(skb
, GFP_ATOMIC
);
329 serr
= SKB_EXT_ERR(skb
);
330 serr
->ee
.ee_errno
= err
;
331 serr
->ee
.ee_origin
= SO_EE_ORIGIN_ICMP
;
332 serr
->ee
.ee_type
= icmp_hdr(skb
)->type
;
333 serr
->ee
.ee_code
= icmp_hdr(skb
)->code
;
335 serr
->ee
.ee_info
= info
;
336 serr
->ee
.ee_data
= 0;
337 serr
->addr_offset
= (u8
*)&(((struct iphdr
*)(icmp_hdr(skb
) + 1))->daddr
) -
338 skb_network_header(skb
);
341 if (skb_pull(skb
, payload
- skb
->data
) != NULL
) {
342 skb_reset_transport_header(skb
);
343 if (sock_queue_err_skb(sk
, skb
) == 0)
349 void ip_local_error(struct sock
*sk
, int err
, __be32 daddr
, __be16 port
, u32 info
)
351 struct inet_sock
*inet
= inet_sk(sk
);
352 struct sock_exterr_skb
*serr
;
359 skb
= alloc_skb(sizeof(struct iphdr
), GFP_ATOMIC
);
363 skb_put(skb
, sizeof(struct iphdr
));
364 skb_reset_network_header(skb
);
368 serr
= SKB_EXT_ERR(skb
);
369 serr
->ee
.ee_errno
= err
;
370 serr
->ee
.ee_origin
= SO_EE_ORIGIN_LOCAL
;
371 serr
->ee
.ee_type
= 0;
372 serr
->ee
.ee_code
= 0;
374 serr
->ee
.ee_info
= info
;
375 serr
->ee
.ee_data
= 0;
376 serr
->addr_offset
= (u8
*)&iph
->daddr
- skb_network_header(skb
);
379 __skb_pull(skb
, skb_tail_pointer(skb
) - skb
->data
);
380 skb_reset_transport_header(skb
);
382 if (sock_queue_err_skb(sk
, skb
))
387 * Handle MSG_ERRQUEUE
389 int ip_recv_error(struct sock
*sk
, struct msghdr
*msg
, int len
, int *addr_len
)
391 struct sock_exterr_skb
*serr
;
392 struct sk_buff
*skb
, *skb2
;
393 struct sockaddr_in
*sin
;
395 struct sock_extended_err ee
;
396 struct sockaddr_in offender
;
402 skb
= skb_dequeue(&sk
->sk_error_queue
);
408 msg
->msg_flags
|= MSG_TRUNC
;
411 err
= skb_copy_datagram_iovec(skb
, 0, msg
->msg_iov
, copied
);
415 sock_recv_timestamp(msg
, sk
, skb
);
417 serr
= SKB_EXT_ERR(skb
);
419 sin
= (struct sockaddr_in
*)msg
->msg_name
;
421 sin
->sin_family
= AF_INET
;
422 sin
->sin_addr
.s_addr
= *(__be32
*)(skb_network_header(skb
) +
424 sin
->sin_port
= serr
->port
;
425 memset(&sin
->sin_zero
, 0, sizeof(sin
->sin_zero
));
426 *addr_len
= sizeof(*sin
);
429 memcpy(&errhdr
.ee
, &serr
->ee
, sizeof(struct sock_extended_err
));
430 sin
= &errhdr
.offender
;
431 sin
->sin_family
= AF_UNSPEC
;
432 if (serr
->ee
.ee_origin
== SO_EE_ORIGIN_ICMP
) {
433 struct inet_sock
*inet
= inet_sk(sk
);
435 sin
->sin_family
= AF_INET
;
436 sin
->sin_addr
.s_addr
= ip_hdr(skb
)->saddr
;
438 memset(&sin
->sin_zero
, 0, sizeof(sin
->sin_zero
));
439 if (inet
->cmsg_flags
)
440 ip_cmsg_recv(msg
, skb
);
443 put_cmsg(msg
, SOL_IP
, IP_RECVERR
, sizeof(errhdr
), &errhdr
);
445 /* Now we could try to dump offended packet options */
447 msg
->msg_flags
|= MSG_ERRQUEUE
;
450 /* Reset and regenerate socket error */
451 spin_lock_bh(&sk
->sk_error_queue
.lock
);
453 skb2
= skb_peek(&sk
->sk_error_queue
);
455 sk
->sk_err
= SKB_EXT_ERR(skb2
)->ee
.ee_errno
;
456 spin_unlock_bh(&sk
->sk_error_queue
.lock
);
457 sk
->sk_error_report(sk
);
459 spin_unlock_bh(&sk
->sk_error_queue
.lock
);
469 * Socket option code for IP. This is the end of the line after any
470 * TCP,UDP etc options on an IP socket.
473 static int do_ip_setsockopt(struct sock
*sk
, int level
,
474 int optname
, char __user
*optval
, unsigned int optlen
)
476 struct inet_sock
*inet
= inet_sk(sk
);
488 case IP_MTU_DISCOVER
:
490 case IP_ROUTER_ALERT
:
497 case IP_MULTICAST_TTL
:
498 case IP_MULTICAST_ALL
:
499 case IP_MULTICAST_LOOP
:
500 case IP_RECVORIGDSTADDR
:
501 if (optlen
>= sizeof(int)) {
502 if (get_user(val
, (int __user
*) optval
))
504 } else if (optlen
>= sizeof(char)) {
507 if (get_user(ucval
, (unsigned char __user
*) optval
))
513 /* If optlen==0, it is equivalent to val == 0 */
515 if (ip_mroute_opt(optname
))
516 return ip_mroute_setsockopt(sk
, optname
, optval
, optlen
);
524 struct ip_options_rcu
*old
, *opt
= NULL
;
528 err
= ip_options_get_from_user(sock_net(sk
), &opt
,
532 old
= rcu_dereference_protected(inet
->inet_opt
,
533 sock_owned_by_user(sk
));
535 struct inet_connection_sock
*icsk
= inet_csk(sk
);
536 #if IS_ENABLED(CONFIG_IPV6)
537 if (sk
->sk_family
== PF_INET
||
538 (!((1 << sk
->sk_state
) &
539 (TCPF_LISTEN
| TCPF_CLOSE
)) &&
540 inet
->inet_daddr
!= LOOPBACK4_IPV6
)) {
543 icsk
->icsk_ext_hdr_len
-= old
->opt
.optlen
;
545 icsk
->icsk_ext_hdr_len
+= opt
->opt
.optlen
;
546 icsk
->icsk_sync_mss(sk
, icsk
->icsk_pmtu_cookie
);
547 #if IS_ENABLED(CONFIG_IPV6)
551 rcu_assign_pointer(inet
->inet_opt
, opt
);
558 inet
->cmsg_flags
|= IP_CMSG_PKTINFO
;
560 inet
->cmsg_flags
&= ~IP_CMSG_PKTINFO
;
564 inet
->cmsg_flags
|= IP_CMSG_TTL
;
566 inet
->cmsg_flags
&= ~IP_CMSG_TTL
;
570 inet
->cmsg_flags
|= IP_CMSG_TOS
;
572 inet
->cmsg_flags
&= ~IP_CMSG_TOS
;
576 inet
->cmsg_flags
|= IP_CMSG_RECVOPTS
;
578 inet
->cmsg_flags
&= ~IP_CMSG_RECVOPTS
;
582 inet
->cmsg_flags
|= IP_CMSG_RETOPTS
;
584 inet
->cmsg_flags
&= ~IP_CMSG_RETOPTS
;
588 inet
->cmsg_flags
|= IP_CMSG_PASSSEC
;
590 inet
->cmsg_flags
&= ~IP_CMSG_PASSSEC
;
592 case IP_RECVORIGDSTADDR
:
594 inet
->cmsg_flags
|= IP_CMSG_ORIGDSTADDR
;
596 inet
->cmsg_flags
&= ~IP_CMSG_ORIGDSTADDR
;
598 case IP_TOS
: /* This sets both TOS and Precedence */
599 if (sk
->sk_type
== SOCK_STREAM
) {
600 val
&= ~INET_ECN_MASK
;
601 val
|= inet
->tos
& INET_ECN_MASK
;
603 if (inet
->tos
!= val
) {
605 sk
->sk_priority
= rt_tos2priority(val
);
612 if (val
!= -1 && (val
< 1 || val
> 255))
617 if (sk
->sk_type
!= SOCK_RAW
) {
621 inet
->hdrincl
= val
? 1 : 0;
624 if (sk
->sk_type
!= SOCK_RAW
) {
628 inet
->nodefrag
= val
? 1 : 0;
630 case IP_MTU_DISCOVER
:
631 if (val
< IP_PMTUDISC_DONT
|| val
> IP_PMTUDISC_INTERFACE
)
633 inet
->pmtudisc
= val
;
636 inet
->recverr
= !!val
;
638 skb_queue_purge(&sk
->sk_error_queue
);
640 case IP_MULTICAST_TTL
:
641 if (sk
->sk_type
== SOCK_STREAM
)
647 if (val
< 0 || val
> 255)
651 case IP_MULTICAST_LOOP
:
654 inet
->mc_loop
= !!val
;
658 struct net_device
*dev
= NULL
;
661 if (optlen
!= sizeof(int))
664 ifindex
= (__force
int)ntohl((__force __be32
)val
);
671 dev
= dev_get_by_index(sock_net(sk
), ifindex
);
672 err
= -EADDRNOTAVAIL
;
678 if (sk
->sk_bound_dev_if
)
681 inet
->uc_index
= ifindex
;
685 case IP_MULTICAST_IF
:
687 struct ip_mreqn mreq
;
688 struct net_device
*dev
= NULL
;
690 if (sk
->sk_type
== SOCK_STREAM
)
693 * Check the arguments are allowable
696 if (optlen
< sizeof(struct in_addr
))
700 if (optlen
>= sizeof(struct ip_mreqn
)) {
701 if (copy_from_user(&mreq
, optval
, sizeof(mreq
)))
704 memset(&mreq
, 0, sizeof(mreq
));
705 if (optlen
>= sizeof(struct ip_mreq
)) {
706 if (copy_from_user(&mreq
, optval
,
707 sizeof(struct ip_mreq
)))
709 } else if (optlen
>= sizeof(struct in_addr
)) {
710 if (copy_from_user(&mreq
.imr_address
, optval
,
711 sizeof(struct in_addr
)))
716 if (!mreq
.imr_ifindex
) {
717 if (mreq
.imr_address
.s_addr
== htonl(INADDR_ANY
)) {
723 dev
= ip_dev_find(sock_net(sk
), mreq
.imr_address
.s_addr
);
725 mreq
.imr_ifindex
= dev
->ifindex
;
727 dev
= dev_get_by_index(sock_net(sk
), mreq
.imr_ifindex
);
730 err
= -EADDRNOTAVAIL
;
736 if (sk
->sk_bound_dev_if
&&
737 mreq
.imr_ifindex
!= sk
->sk_bound_dev_if
)
740 inet
->mc_index
= mreq
.imr_ifindex
;
741 inet
->mc_addr
= mreq
.imr_address
.s_addr
;
746 case IP_ADD_MEMBERSHIP
:
747 case IP_DROP_MEMBERSHIP
:
749 struct ip_mreqn mreq
;
752 if (inet_sk(sk
)->is_icsk
)
755 if (optlen
< sizeof(struct ip_mreq
))
758 if (optlen
>= sizeof(struct ip_mreqn
)) {
759 if (copy_from_user(&mreq
, optval
, sizeof(mreq
)))
762 memset(&mreq
, 0, sizeof(mreq
));
763 if (copy_from_user(&mreq
, optval
, sizeof(struct ip_mreq
)))
767 if (optname
== IP_ADD_MEMBERSHIP
)
768 err
= ip_mc_join_group(sk
, &mreq
);
770 err
= ip_mc_leave_group(sk
, &mreq
);
775 struct ip_msfilter
*msf
;
777 if (optlen
< IP_MSFILTER_SIZE(0))
779 if (optlen
> sysctl_optmem_max
) {
783 msf
= kmalloc(optlen
, GFP_KERNEL
);
789 if (copy_from_user(msf
, optval
, optlen
)) {
793 /* numsrc >= (1G-4) overflow in 32 bits */
794 if (msf
->imsf_numsrc
>= 0x3ffffffcU
||
795 msf
->imsf_numsrc
> sysctl_igmp_max_msf
) {
800 if (IP_MSFILTER_SIZE(msf
->imsf_numsrc
) > optlen
) {
805 err
= ip_mc_msfilter(sk
, msf
, 0);
809 case IP_BLOCK_SOURCE
:
810 case IP_UNBLOCK_SOURCE
:
811 case IP_ADD_SOURCE_MEMBERSHIP
:
812 case IP_DROP_SOURCE_MEMBERSHIP
:
814 struct ip_mreq_source mreqs
;
817 if (optlen
!= sizeof(struct ip_mreq_source
))
819 if (copy_from_user(&mreqs
, optval
, sizeof(mreqs
))) {
823 if (optname
== IP_BLOCK_SOURCE
) {
824 omode
= MCAST_EXCLUDE
;
826 } else if (optname
== IP_UNBLOCK_SOURCE
) {
827 omode
= MCAST_EXCLUDE
;
829 } else if (optname
== IP_ADD_SOURCE_MEMBERSHIP
) {
830 struct ip_mreqn mreq
;
832 mreq
.imr_multiaddr
.s_addr
= mreqs
.imr_multiaddr
;
833 mreq
.imr_address
.s_addr
= mreqs
.imr_interface
;
834 mreq
.imr_ifindex
= 0;
835 err
= ip_mc_join_group(sk
, &mreq
);
836 if (err
&& err
!= -EADDRINUSE
)
838 omode
= MCAST_INCLUDE
;
840 } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
841 omode
= MCAST_INCLUDE
;
844 err
= ip_mc_source(add
, omode
, sk
, &mreqs
, 0);
847 case MCAST_JOIN_GROUP
:
848 case MCAST_LEAVE_GROUP
:
850 struct group_req greq
;
851 struct sockaddr_in
*psin
;
852 struct ip_mreqn mreq
;
854 if (optlen
< sizeof(struct group_req
))
857 if (copy_from_user(&greq
, optval
, sizeof(greq
)))
859 psin
= (struct sockaddr_in
*)&greq
.gr_group
;
860 if (psin
->sin_family
!= AF_INET
)
862 memset(&mreq
, 0, sizeof(mreq
));
863 mreq
.imr_multiaddr
= psin
->sin_addr
;
864 mreq
.imr_ifindex
= greq
.gr_interface
;
866 if (optname
== MCAST_JOIN_GROUP
)
867 err
= ip_mc_join_group(sk
, &mreq
);
869 err
= ip_mc_leave_group(sk
, &mreq
);
872 case MCAST_JOIN_SOURCE_GROUP
:
873 case MCAST_LEAVE_SOURCE_GROUP
:
874 case MCAST_BLOCK_SOURCE
:
875 case MCAST_UNBLOCK_SOURCE
:
877 struct group_source_req greqs
;
878 struct ip_mreq_source mreqs
;
879 struct sockaddr_in
*psin
;
882 if (optlen
!= sizeof(struct group_source_req
))
884 if (copy_from_user(&greqs
, optval
, sizeof(greqs
))) {
888 if (greqs
.gsr_group
.ss_family
!= AF_INET
||
889 greqs
.gsr_source
.ss_family
!= AF_INET
) {
890 err
= -EADDRNOTAVAIL
;
893 psin
= (struct sockaddr_in
*)&greqs
.gsr_group
;
894 mreqs
.imr_multiaddr
= psin
->sin_addr
.s_addr
;
895 psin
= (struct sockaddr_in
*)&greqs
.gsr_source
;
896 mreqs
.imr_sourceaddr
= psin
->sin_addr
.s_addr
;
897 mreqs
.imr_interface
= 0; /* use index for mc_source */
899 if (optname
== MCAST_BLOCK_SOURCE
) {
900 omode
= MCAST_EXCLUDE
;
902 } else if (optname
== MCAST_UNBLOCK_SOURCE
) {
903 omode
= MCAST_EXCLUDE
;
905 } else if (optname
== MCAST_JOIN_SOURCE_GROUP
) {
906 struct ip_mreqn mreq
;
908 psin
= (struct sockaddr_in
*)&greqs
.gsr_group
;
909 mreq
.imr_multiaddr
= psin
->sin_addr
;
910 mreq
.imr_address
.s_addr
= 0;
911 mreq
.imr_ifindex
= greqs
.gsr_interface
;
912 err
= ip_mc_join_group(sk
, &mreq
);
913 if (err
&& err
!= -EADDRINUSE
)
915 greqs
.gsr_interface
= mreq
.imr_ifindex
;
916 omode
= MCAST_INCLUDE
;
918 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
919 omode
= MCAST_INCLUDE
;
922 err
= ip_mc_source(add
, omode
, sk
, &mreqs
,
923 greqs
.gsr_interface
);
928 struct sockaddr_in
*psin
;
929 struct ip_msfilter
*msf
= NULL
;
930 struct group_filter
*gsf
= NULL
;
931 int msize
, i
, ifindex
;
933 if (optlen
< GROUP_FILTER_SIZE(0))
935 if (optlen
> sysctl_optmem_max
) {
939 gsf
= kmalloc(optlen
, GFP_KERNEL
);
945 if (copy_from_user(gsf
, optval
, optlen
))
948 /* numsrc >= (4G-140)/128 overflow in 32 bits */
949 if (gsf
->gf_numsrc
>= 0x1ffffff ||
950 gsf
->gf_numsrc
> sysctl_igmp_max_msf
) {
954 if (GROUP_FILTER_SIZE(gsf
->gf_numsrc
) > optlen
) {
958 msize
= IP_MSFILTER_SIZE(gsf
->gf_numsrc
);
959 msf
= kmalloc(msize
, GFP_KERNEL
);
964 ifindex
= gsf
->gf_interface
;
965 psin
= (struct sockaddr_in
*)&gsf
->gf_group
;
966 if (psin
->sin_family
!= AF_INET
) {
967 err
= -EADDRNOTAVAIL
;
970 msf
->imsf_multiaddr
= psin
->sin_addr
.s_addr
;
971 msf
->imsf_interface
= 0;
972 msf
->imsf_fmode
= gsf
->gf_fmode
;
973 msf
->imsf_numsrc
= gsf
->gf_numsrc
;
974 err
= -EADDRNOTAVAIL
;
975 for (i
= 0; i
< gsf
->gf_numsrc
; ++i
) {
976 psin
= (struct sockaddr_in
*)&gsf
->gf_slist
[i
];
978 if (psin
->sin_family
!= AF_INET
)
980 msf
->imsf_slist
[i
] = psin
->sin_addr
.s_addr
;
985 err
= ip_mc_msfilter(sk
, msf
, ifindex
);
991 case IP_MULTICAST_ALL
:
994 if (val
!= 0 && val
!= 1)
998 case IP_ROUTER_ALERT
:
999 err
= ip_ra_control(sk
, val
? 1 : 0, NULL
);
1005 inet
->freebind
= !!val
;
1008 case IP_IPSEC_POLICY
:
1009 case IP_XFRM_POLICY
:
1011 if (!ns_capable(sock_net(sk
)->user_ns
, CAP_NET_ADMIN
))
1013 err
= xfrm_user_policy(sk
, optname
, optval
, optlen
);
1016 case IP_TRANSPARENT
:
1017 if (!!val
&& !ns_capable(sock_net(sk
)->user_ns
, CAP_NET_RAW
) &&
1018 !ns_capable(sock_net(sk
)->user_ns
, CAP_NET_ADMIN
)) {
1024 inet
->transparent
= !!val
;
1030 if (val
< 0 || val
> 255)
1032 inet
->min_ttl
= val
;
1048 * ipv4_pktinfo_prepare - transfert some info from rtable to skb
1052 * To support IP_CMSG_PKTINFO option, we store rt_iif and specific
1053 * destination in skb->cb[] before dst drop.
1054 * This way, receiver doesn't make cache line misses to read rtable.
1056 void ipv4_pktinfo_prepare(const struct sock
*sk
, struct sk_buff
*skb
)
1058 struct in_pktinfo
*pktinfo
= PKTINFO_SKB_CB(skb
);
1060 if ((inet_sk(sk
)->cmsg_flags
& IP_CMSG_PKTINFO
) &&
1062 pktinfo
->ipi_ifindex
= inet_iif(skb
);
1063 pktinfo
->ipi_spec_dst
.s_addr
= fib_compute_spec_dst(skb
);
1065 pktinfo
->ipi_ifindex
= 0;
1066 pktinfo
->ipi_spec_dst
.s_addr
= 0;
1071 int ip_setsockopt(struct sock
*sk
, int level
,
1072 int optname
, char __user
*optval
, unsigned int optlen
)
1076 if (level
!= SOL_IP
)
1077 return -ENOPROTOOPT
;
1079 err
= do_ip_setsockopt(sk
, level
, optname
, optval
, optlen
);
1080 #ifdef CONFIG_NETFILTER
1081 /* we need to exclude all possible ENOPROTOOPTs except default case */
1082 if (err
== -ENOPROTOOPT
&& optname
!= IP_HDRINCL
&&
1083 optname
!= IP_IPSEC_POLICY
&&
1084 optname
!= IP_XFRM_POLICY
&&
1085 !ip_mroute_opt(optname
)) {
1087 err
= nf_setsockopt(sk
, PF_INET
, optname
, optval
, optlen
);
1093 EXPORT_SYMBOL(ip_setsockopt
);
1095 #ifdef CONFIG_COMPAT
1096 int compat_ip_setsockopt(struct sock
*sk
, int level
, int optname
,
1097 char __user
*optval
, unsigned int optlen
)
1101 if (level
!= SOL_IP
)
1102 return -ENOPROTOOPT
;
1104 if (optname
>= MCAST_JOIN_GROUP
&& optname
<= MCAST_MSFILTER
)
1105 return compat_mc_setsockopt(sk
, level
, optname
, optval
, optlen
,
1108 err
= do_ip_setsockopt(sk
, level
, optname
, optval
, optlen
);
1109 #ifdef CONFIG_NETFILTER
1110 /* we need to exclude all possible ENOPROTOOPTs except default case */
1111 if (err
== -ENOPROTOOPT
&& optname
!= IP_HDRINCL
&&
1112 optname
!= IP_IPSEC_POLICY
&&
1113 optname
!= IP_XFRM_POLICY
&&
1114 !ip_mroute_opt(optname
)) {
1116 err
= compat_nf_setsockopt(sk
, PF_INET
, optname
,
1123 EXPORT_SYMBOL(compat_ip_setsockopt
);
1127 * Get the options. Note for future reference. The GET of IP options gets
1128 * the _received_ ones. The set sets the _sent_ ones.
1131 static int do_ip_getsockopt(struct sock
*sk
, int level
, int optname
,
1132 char __user
*optval
, int __user
*optlen
, unsigned int flags
)
1134 struct inet_sock
*inet
= inet_sk(sk
);
1138 if (level
!= SOL_IP
)
1141 if (ip_mroute_opt(optname
))
1142 return ip_mroute_getsockopt(sk
, optname
, optval
, optlen
);
1144 if (get_user(len
, optlen
))
1154 unsigned char optbuf
[sizeof(struct ip_options
)+40];
1155 struct ip_options
*opt
= (struct ip_options
*)optbuf
;
1156 struct ip_options_rcu
*inet_opt
;
1158 inet_opt
= rcu_dereference_protected(inet
->inet_opt
,
1159 sock_owned_by_user(sk
));
1162 memcpy(optbuf
, &inet_opt
->opt
,
1163 sizeof(struct ip_options
) +
1164 inet_opt
->opt
.optlen
);
1167 if (opt
->optlen
== 0)
1168 return put_user(0, optlen
);
1170 ip_options_undo(opt
);
1172 len
= min_t(unsigned int, len
, opt
->optlen
);
1173 if (put_user(len
, optlen
))
1175 if (copy_to_user(optval
, opt
->__data
, len
))
1180 val
= (inet
->cmsg_flags
& IP_CMSG_PKTINFO
) != 0;
1183 val
= (inet
->cmsg_flags
& IP_CMSG_TTL
) != 0;
1186 val
= (inet
->cmsg_flags
& IP_CMSG_TOS
) != 0;
1189 val
= (inet
->cmsg_flags
& IP_CMSG_RECVOPTS
) != 0;
1192 val
= (inet
->cmsg_flags
& IP_CMSG_RETOPTS
) != 0;
1195 val
= (inet
->cmsg_flags
& IP_CMSG_PASSSEC
) != 0;
1197 case IP_RECVORIGDSTADDR
:
1198 val
= (inet
->cmsg_flags
& IP_CMSG_ORIGDSTADDR
) != 0;
1204 val
= (inet
->uc_ttl
== -1 ?
1205 sysctl_ip_default_ttl
:
1209 val
= inet
->hdrincl
;
1212 val
= inet
->nodefrag
;
1214 case IP_MTU_DISCOVER
:
1215 val
= inet
->pmtudisc
;
1219 struct dst_entry
*dst
;
1221 dst
= sk_dst_get(sk
);
1233 val
= inet
->recverr
;
1235 case IP_MULTICAST_TTL
:
1238 case IP_MULTICAST_LOOP
:
1239 val
= inet
->mc_loop
;
1242 val
= (__force
int)htonl((__u32
) inet
->uc_index
);
1244 case IP_MULTICAST_IF
:
1246 struct in_addr addr
;
1247 len
= min_t(unsigned int, len
, sizeof(struct in_addr
));
1248 addr
.s_addr
= inet
->mc_addr
;
1251 if (put_user(len
, optlen
))
1253 if (copy_to_user(optval
, &addr
, len
))
1259 struct ip_msfilter msf
;
1262 if (len
< IP_MSFILTER_SIZE(0)) {
1266 if (copy_from_user(&msf
, optval
, IP_MSFILTER_SIZE(0))) {
1270 err
= ip_mc_msfget(sk
, &msf
,
1271 (struct ip_msfilter __user
*)optval
, optlen
);
1275 case MCAST_MSFILTER
:
1277 struct group_filter gsf
;
1280 if (len
< GROUP_FILTER_SIZE(0)) {
1284 if (copy_from_user(&gsf
, optval
, GROUP_FILTER_SIZE(0))) {
1288 err
= ip_mc_gsfget(sk
, &gsf
,
1289 (struct group_filter __user
*)optval
,
1294 case IP_MULTICAST_ALL
:
1303 if (sk
->sk_type
!= SOCK_STREAM
)
1304 return -ENOPROTOOPT
;
1306 msg
.msg_control
= optval
;
1307 msg
.msg_controllen
= len
;
1308 msg
.msg_flags
= flags
;
1310 if (inet
->cmsg_flags
& IP_CMSG_PKTINFO
) {
1311 struct in_pktinfo info
;
1313 info
.ipi_addr
.s_addr
= inet
->inet_rcv_saddr
;
1314 info
.ipi_spec_dst
.s_addr
= inet
->inet_rcv_saddr
;
1315 info
.ipi_ifindex
= inet
->mc_index
;
1316 put_cmsg(&msg
, SOL_IP
, IP_PKTINFO
, sizeof(info
), &info
);
1318 if (inet
->cmsg_flags
& IP_CMSG_TTL
) {
1319 int hlim
= inet
->mc_ttl
;
1320 put_cmsg(&msg
, SOL_IP
, IP_TTL
, sizeof(hlim
), &hlim
);
1322 if (inet
->cmsg_flags
& IP_CMSG_TOS
) {
1323 int tos
= inet
->rcv_tos
;
1324 put_cmsg(&msg
, SOL_IP
, IP_TOS
, sizeof(tos
), &tos
);
1326 len
-= msg
.msg_controllen
;
1327 return put_user(len
, optlen
);
1330 val
= inet
->freebind
;
1332 case IP_TRANSPARENT
:
1333 val
= inet
->transparent
;
1336 val
= inet
->min_ttl
;
1340 return -ENOPROTOOPT
;
1344 if (len
< sizeof(int) && len
> 0 && val
>= 0 && val
<= 255) {
1345 unsigned char ucval
= (unsigned char)val
;
1347 if (put_user(len
, optlen
))
1349 if (copy_to_user(optval
, &ucval
, 1))
1352 len
= min_t(unsigned int, sizeof(int), len
);
1353 if (put_user(len
, optlen
))
1355 if (copy_to_user(optval
, &val
, len
))
1361 int ip_getsockopt(struct sock
*sk
, int level
,
1362 int optname
, char __user
*optval
, int __user
*optlen
)
1366 err
= do_ip_getsockopt(sk
, level
, optname
, optval
, optlen
, 0);
1367 #ifdef CONFIG_NETFILTER
1368 /* we need to exclude all possible ENOPROTOOPTs except default case */
1369 if (err
== -ENOPROTOOPT
&& optname
!= IP_PKTOPTIONS
&&
1370 !ip_mroute_opt(optname
)) {
1373 if (get_user(len
, optlen
))
1377 err
= nf_getsockopt(sk
, PF_INET
, optname
, optval
,
1381 err
= put_user(len
, optlen
);
1387 EXPORT_SYMBOL(ip_getsockopt
);
1389 #ifdef CONFIG_COMPAT
1390 int compat_ip_getsockopt(struct sock
*sk
, int level
, int optname
,
1391 char __user
*optval
, int __user
*optlen
)
1395 if (optname
== MCAST_MSFILTER
)
1396 return compat_mc_getsockopt(sk
, level
, optname
, optval
, optlen
,
1399 err
= do_ip_getsockopt(sk
, level
, optname
, optval
, optlen
,
1402 #ifdef CONFIG_NETFILTER
1403 /* we need to exclude all possible ENOPROTOOPTs except default case */
1404 if (err
== -ENOPROTOOPT
&& optname
!= IP_PKTOPTIONS
&&
1405 !ip_mroute_opt(optname
)) {
1408 if (get_user(len
, optlen
))
1412 err
= compat_nf_getsockopt(sk
, PF_INET
, optname
, optval
, &len
);
1415 err
= put_user(len
, optlen
);
1421 EXPORT_SYMBOL(compat_ip_getsockopt
);