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Merge branch 'for-3.13-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj...
[deliverable/linux.git] / net / ipv4 / ip_sockglue.c
1 /*
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.
5 *
6 * The IP to API glue.
7 *
8 * Authors: see ip.c
9 *
10 * Fixes:
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
14 * TOS tweaks.
15 * Mike McLagan : Routing by source
16 */
17
18 #include <linux/module.h>
19 #include <linux/types.h>
20 #include <linux/mm.h>
21 #include <linux/skbuff.h>
22 #include <linux/ip.h>
23 #include <linux/icmp.h>
24 #include <linux/inetdevice.h>
25 #include <linux/netdevice.h>
26 #include <linux/slab.h>
27 #include <net/sock.h>
28 #include <net/ip.h>
29 #include <net/icmp.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>
38 #include <net/xfrm.h>
39 #include <net/compat.h>
40 #if IS_ENABLED(CONFIG_IPV6)
41 #include <net/transp_v6.h>
42 #endif
43 #include <net/ip_fib.h>
44
45 #include <linux/errqueue.h>
46 #include <asm/uaccess.h>
47
48 #define IP_CMSG_PKTINFO 1
49 #define IP_CMSG_TTL 2
50 #define IP_CMSG_TOS 4
51 #define IP_CMSG_RECVOPTS 8
52 #define IP_CMSG_RETOPTS 16
53 #define IP_CMSG_PASSSEC 32
54 #define IP_CMSG_ORIGDSTADDR 64
55
56 /*
57 * SOL_IP control messages.
58 */
59 #define PKTINFO_SKB_CB(__skb) ((struct in_pktinfo *)((__skb)->cb))
60
61 static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb)
62 {
63 struct in_pktinfo info = *PKTINFO_SKB_CB(skb);
64
65 info.ipi_addr.s_addr = ip_hdr(skb)->daddr;
66
67 put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
68 }
69
70 static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb)
71 {
72 int ttl = ip_hdr(skb)->ttl;
73 put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl);
74 }
75
76 static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb)
77 {
78 put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos);
79 }
80
81 static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb)
82 {
83 if (IPCB(skb)->opt.optlen == 0)
84 return;
85
86 put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen,
87 ip_hdr(skb) + 1);
88 }
89
90
91 static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb)
92 {
93 unsigned char optbuf[sizeof(struct ip_options) + 40];
94 struct ip_options *opt = (struct ip_options *)optbuf;
95
96 if (IPCB(skb)->opt.optlen == 0)
97 return;
98
99 if (ip_options_echo(opt, skb)) {
100 msg->msg_flags |= MSG_CTRUNC;
101 return;
102 }
103 ip_options_undo(opt);
104
105 put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data);
106 }
107
108 static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
109 {
110 char *secdata;
111 u32 seclen, secid;
112 int err;
113
114 err = security_socket_getpeersec_dgram(NULL, skb, &secid);
115 if (err)
116 return;
117
118 err = security_secid_to_secctx(secid, &secdata, &seclen);
119 if (err)
120 return;
121
122 put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata);
123 security_release_secctx(secdata, seclen);
124 }
125
126 static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb)
127 {
128 struct sockaddr_in sin;
129 const struct iphdr *iph = ip_hdr(skb);
130 __be16 *ports = (__be16 *)skb_transport_header(skb);
131
132 if (skb_transport_offset(skb) + 4 > skb->len)
133 return;
134
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.
138 */
139
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));
144
145 put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin);
146 }
147
148 void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
149 {
150 struct inet_sock *inet = inet_sk(skb->sk);
151 unsigned int flags = inet->cmsg_flags;
152
153 /* Ordered by supposed usage frequency */
154 if (flags & 1)
155 ip_cmsg_recv_pktinfo(msg, skb);
156 if ((flags >>= 1) == 0)
157 return;
158
159 if (flags & 1)
160 ip_cmsg_recv_ttl(msg, skb);
161 if ((flags >>= 1) == 0)
162 return;
163
164 if (flags & 1)
165 ip_cmsg_recv_tos(msg, skb);
166 if ((flags >>= 1) == 0)
167 return;
168
169 if (flags & 1)
170 ip_cmsg_recv_opts(msg, skb);
171 if ((flags >>= 1) == 0)
172 return;
173
174 if (flags & 1)
175 ip_cmsg_recv_retopts(msg, skb);
176 if ((flags >>= 1) == 0)
177 return;
178
179 if (flags & 1)
180 ip_cmsg_recv_security(msg, skb);
181
182 if ((flags >>= 1) == 0)
183 return;
184 if (flags & 1)
185 ip_cmsg_recv_dstaddr(msg, skb);
186
187 }
188 EXPORT_SYMBOL(ip_cmsg_recv);
189
190 int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc)
191 {
192 int err, val;
193 struct cmsghdr *cmsg;
194
195 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
196 if (!CMSG_OK(msg, cmsg))
197 return -EINVAL;
198 if (cmsg->cmsg_level != SOL_IP)
199 continue;
200 switch (cmsg->cmsg_type) {
201 case IP_RETOPTS:
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);
205 if (err)
206 return err;
207 break;
208 case IP_PKTINFO:
209 {
210 struct in_pktinfo *info;
211 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
212 return -EINVAL;
213 info = (struct in_pktinfo *)CMSG_DATA(cmsg);
214 ipc->oif = info->ipi_ifindex;
215 ipc->addr = info->ipi_spec_dst.s_addr;
216 break;
217 }
218 case IP_TTL:
219 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
220 return -EINVAL;
221 val = *(int *)CMSG_DATA(cmsg);
222 if (val < 1 || val > 255)
223 return -EINVAL;
224 ipc->ttl = val;
225 break;
226 case IP_TOS:
227 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
228 return -EINVAL;
229 val = *(int *)CMSG_DATA(cmsg);
230 if (val < 0 || val > 255)
231 return -EINVAL;
232 ipc->tos = val;
233 ipc->priority = rt_tos2priority(ipc->tos);
234 break;
235
236 default:
237 return -EINVAL;
238 }
239 }
240 return 0;
241 }
242
243
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.
248
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.
253 */
254 struct ip_ra_chain __rcu *ip_ra_chain;
255 static DEFINE_SPINLOCK(ip_ra_lock);
256
257
258 static void ip_ra_destroy_rcu(struct rcu_head *head)
259 {
260 struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu);
261
262 sock_put(ra->saved_sk);
263 kfree(ra);
264 }
265
266 int ip_ra_control(struct sock *sk, unsigned char on,
267 void (*destructor)(struct sock *))
268 {
269 struct ip_ra_chain *ra, *new_ra;
270 struct ip_ra_chain __rcu **rap;
271
272 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW)
273 return -EINVAL;
274
275 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
276
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;
281 rap = &ra->next) {
282 if (ra->sk == sk) {
283 if (on) {
284 spin_unlock_bh(&ip_ra_lock);
285 kfree(new_ra);
286 return -EADDRINUSE;
287 }
288 /* dont let ip_call_ra_chain() use sk again */
289 ra->sk = NULL;
290 rcu_assign_pointer(*rap, ra->next);
291 spin_unlock_bh(&ip_ra_lock);
292
293 if (ra->destructor)
294 ra->destructor(sk);
295 /*
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.
299 */
300 ra->saved_sk = sk;
301 call_rcu(&ra->rcu, ip_ra_destroy_rcu);
302 return 0;
303 }
304 }
305 if (new_ra == NULL) {
306 spin_unlock_bh(&ip_ra_lock);
307 return -ENOBUFS;
308 }
309 new_ra->sk = sk;
310 new_ra->destructor = destructor;
311
312 new_ra->next = ra;
313 rcu_assign_pointer(*rap, new_ra);
314 sock_hold(sk);
315 spin_unlock_bh(&ip_ra_lock);
316
317 return 0;
318 }
319
320 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
321 __be16 port, u32 info, u8 *payload)
322 {
323 struct sock_exterr_skb *serr;
324
325 skb = skb_clone(skb, GFP_ATOMIC);
326 if (!skb)
327 return;
328
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;
334 serr->ee.ee_pad = 0;
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);
339 serr->port = port;
340
341 if (skb_pull(skb, payload - skb->data) != NULL) {
342 skb_reset_transport_header(skb);
343 if (sock_queue_err_skb(sk, skb) == 0)
344 return;
345 }
346 kfree_skb(skb);
347 }
348
349 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info)
350 {
351 struct inet_sock *inet = inet_sk(sk);
352 struct sock_exterr_skb *serr;
353 struct iphdr *iph;
354 struct sk_buff *skb;
355
356 if (!inet->recverr)
357 return;
358
359 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
360 if (!skb)
361 return;
362
363 skb_put(skb, sizeof(struct iphdr));
364 skb_reset_network_header(skb);
365 iph = ip_hdr(skb);
366 iph->daddr = daddr;
367
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;
373 serr->ee.ee_pad = 0;
374 serr->ee.ee_info = info;
375 serr->ee.ee_data = 0;
376 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
377 serr->port = port;
378
379 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
380 skb_reset_transport_header(skb);
381
382 if (sock_queue_err_skb(sk, skb))
383 kfree_skb(skb);
384 }
385
386 /*
387 * Handle MSG_ERRQUEUE
388 */
389 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
390 {
391 struct sock_exterr_skb *serr;
392 struct sk_buff *skb, *skb2;
393 struct sockaddr_in *sin;
394 struct {
395 struct sock_extended_err ee;
396 struct sockaddr_in offender;
397 } errhdr;
398 int err;
399 int copied;
400
401 err = -EAGAIN;
402 skb = skb_dequeue(&sk->sk_error_queue);
403 if (skb == NULL)
404 goto out;
405
406 copied = skb->len;
407 if (copied > len) {
408 msg->msg_flags |= MSG_TRUNC;
409 copied = len;
410 }
411 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
412 if (err)
413 goto out_free_skb;
414
415 sock_recv_timestamp(msg, sk, skb);
416
417 serr = SKB_EXT_ERR(skb);
418
419 sin = (struct sockaddr_in *)msg->msg_name;
420 if (sin) {
421 sin->sin_family = AF_INET;
422 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) +
423 serr->addr_offset);
424 sin->sin_port = serr->port;
425 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
426 *addr_len = sizeof(*sin);
427 }
428
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);
434
435 sin->sin_family = AF_INET;
436 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
437 sin->sin_port = 0;
438 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
439 if (inet->cmsg_flags)
440 ip_cmsg_recv(msg, skb);
441 }
442
443 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
444
445 /* Now we could try to dump offended packet options */
446
447 msg->msg_flags |= MSG_ERRQUEUE;
448 err = copied;
449
450 /* Reset and regenerate socket error */
451 spin_lock_bh(&sk->sk_error_queue.lock);
452 sk->sk_err = 0;
453 skb2 = skb_peek(&sk->sk_error_queue);
454 if (skb2 != NULL) {
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);
458 } else
459 spin_unlock_bh(&sk->sk_error_queue.lock);
460
461 out_free_skb:
462 kfree_skb(skb);
463 out:
464 return err;
465 }
466
467
468 /*
469 * Socket option code for IP. This is the end of the line after any
470 * TCP,UDP etc options on an IP socket.
471 */
472
473 static int do_ip_setsockopt(struct sock *sk, int level,
474 int optname, char __user *optval, unsigned int optlen)
475 {
476 struct inet_sock *inet = inet_sk(sk);
477 int val = 0, err;
478
479 switch (optname) {
480 case IP_PKTINFO:
481 case IP_RECVTTL:
482 case IP_RECVOPTS:
483 case IP_RECVTOS:
484 case IP_RETOPTS:
485 case IP_TOS:
486 case IP_TTL:
487 case IP_HDRINCL:
488 case IP_MTU_DISCOVER:
489 case IP_RECVERR:
490 case IP_ROUTER_ALERT:
491 case IP_FREEBIND:
492 case IP_PASSSEC:
493 case IP_TRANSPARENT:
494 case IP_MINTTL:
495 case IP_NODEFRAG:
496 case IP_UNICAST_IF:
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))
503 return -EFAULT;
504 } else if (optlen >= sizeof(char)) {
505 unsigned char ucval;
506
507 if (get_user(ucval, (unsigned char __user *) optval))
508 return -EFAULT;
509 val = (int) ucval;
510 }
511 }
512
513 /* If optlen==0, it is equivalent to val == 0 */
514
515 if (ip_mroute_opt(optname))
516 return ip_mroute_setsockopt(sk, optname, optval, optlen);
517
518 err = 0;
519 lock_sock(sk);
520
521 switch (optname) {
522 case IP_OPTIONS:
523 {
524 struct ip_options_rcu *old, *opt = NULL;
525
526 if (optlen > 40)
527 goto e_inval;
528 err = ip_options_get_from_user(sock_net(sk), &opt,
529 optval, optlen);
530 if (err)
531 break;
532 old = rcu_dereference_protected(inet->inet_opt,
533 sock_owned_by_user(sk));
534 if (inet->is_icsk) {
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)) {
541 #endif
542 if (old)
543 icsk->icsk_ext_hdr_len -= old->opt.optlen;
544 if (opt)
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)
548 }
549 #endif
550 }
551 rcu_assign_pointer(inet->inet_opt, opt);
552 if (old)
553 kfree_rcu(old, rcu);
554 break;
555 }
556 case IP_PKTINFO:
557 if (val)
558 inet->cmsg_flags |= IP_CMSG_PKTINFO;
559 else
560 inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
561 break;
562 case IP_RECVTTL:
563 if (val)
564 inet->cmsg_flags |= IP_CMSG_TTL;
565 else
566 inet->cmsg_flags &= ~IP_CMSG_TTL;
567 break;
568 case IP_RECVTOS:
569 if (val)
570 inet->cmsg_flags |= IP_CMSG_TOS;
571 else
572 inet->cmsg_flags &= ~IP_CMSG_TOS;
573 break;
574 case IP_RECVOPTS:
575 if (val)
576 inet->cmsg_flags |= IP_CMSG_RECVOPTS;
577 else
578 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
579 break;
580 case IP_RETOPTS:
581 if (val)
582 inet->cmsg_flags |= IP_CMSG_RETOPTS;
583 else
584 inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
585 break;
586 case IP_PASSSEC:
587 if (val)
588 inet->cmsg_flags |= IP_CMSG_PASSSEC;
589 else
590 inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
591 break;
592 case IP_RECVORIGDSTADDR:
593 if (val)
594 inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR;
595 else
596 inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR;
597 break;
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;
602 }
603 if (inet->tos != val) {
604 inet->tos = val;
605 sk->sk_priority = rt_tos2priority(val);
606 sk_dst_reset(sk);
607 }
608 break;
609 case IP_TTL:
610 if (optlen < 1)
611 goto e_inval;
612 if (val != -1 && (val < 1 || val > 255))
613 goto e_inval;
614 inet->uc_ttl = val;
615 break;
616 case IP_HDRINCL:
617 if (sk->sk_type != SOCK_RAW) {
618 err = -ENOPROTOOPT;
619 break;
620 }
621 inet->hdrincl = val ? 1 : 0;
622 break;
623 case IP_NODEFRAG:
624 if (sk->sk_type != SOCK_RAW) {
625 err = -ENOPROTOOPT;
626 break;
627 }
628 inet->nodefrag = val ? 1 : 0;
629 break;
630 case IP_MTU_DISCOVER:
631 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_INTERFACE)
632 goto e_inval;
633 inet->pmtudisc = val;
634 break;
635 case IP_RECVERR:
636 inet->recverr = !!val;
637 if (!val)
638 skb_queue_purge(&sk->sk_error_queue);
639 break;
640 case IP_MULTICAST_TTL:
641 if (sk->sk_type == SOCK_STREAM)
642 goto e_inval;
643 if (optlen < 1)
644 goto e_inval;
645 if (val == -1)
646 val = 1;
647 if (val < 0 || val > 255)
648 goto e_inval;
649 inet->mc_ttl = val;
650 break;
651 case IP_MULTICAST_LOOP:
652 if (optlen < 1)
653 goto e_inval;
654 inet->mc_loop = !!val;
655 break;
656 case IP_UNICAST_IF:
657 {
658 struct net_device *dev = NULL;
659 int ifindex;
660
661 if (optlen != sizeof(int))
662 goto e_inval;
663
664 ifindex = (__force int)ntohl((__force __be32)val);
665 if (ifindex == 0) {
666 inet->uc_index = 0;
667 err = 0;
668 break;
669 }
670
671 dev = dev_get_by_index(sock_net(sk), ifindex);
672 err = -EADDRNOTAVAIL;
673 if (!dev)
674 break;
675 dev_put(dev);
676
677 err = -EINVAL;
678 if (sk->sk_bound_dev_if)
679 break;
680
681 inet->uc_index = ifindex;
682 err = 0;
683 break;
684 }
685 case IP_MULTICAST_IF:
686 {
687 struct ip_mreqn mreq;
688 struct net_device *dev = NULL;
689
690 if (sk->sk_type == SOCK_STREAM)
691 goto e_inval;
692 /*
693 * Check the arguments are allowable
694 */
695
696 if (optlen < sizeof(struct in_addr))
697 goto e_inval;
698
699 err = -EFAULT;
700 if (optlen >= sizeof(struct ip_mreqn)) {
701 if (copy_from_user(&mreq, optval, sizeof(mreq)))
702 break;
703 } else {
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)))
708 break;
709 } else if (optlen >= sizeof(struct in_addr)) {
710 if (copy_from_user(&mreq.imr_address, optval,
711 sizeof(struct in_addr)))
712 break;
713 }
714 }
715
716 if (!mreq.imr_ifindex) {
717 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) {
718 inet->mc_index = 0;
719 inet->mc_addr = 0;
720 err = 0;
721 break;
722 }
723 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr);
724 if (dev)
725 mreq.imr_ifindex = dev->ifindex;
726 } else
727 dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex);
728
729
730 err = -EADDRNOTAVAIL;
731 if (!dev)
732 break;
733 dev_put(dev);
734
735 err = -EINVAL;
736 if (sk->sk_bound_dev_if &&
737 mreq.imr_ifindex != sk->sk_bound_dev_if)
738 break;
739
740 inet->mc_index = mreq.imr_ifindex;
741 inet->mc_addr = mreq.imr_address.s_addr;
742 err = 0;
743 break;
744 }
745
746 case IP_ADD_MEMBERSHIP:
747 case IP_DROP_MEMBERSHIP:
748 {
749 struct ip_mreqn mreq;
750
751 err = -EPROTO;
752 if (inet_sk(sk)->is_icsk)
753 break;
754
755 if (optlen < sizeof(struct ip_mreq))
756 goto e_inval;
757 err = -EFAULT;
758 if (optlen >= sizeof(struct ip_mreqn)) {
759 if (copy_from_user(&mreq, optval, sizeof(mreq)))
760 break;
761 } else {
762 memset(&mreq, 0, sizeof(mreq));
763 if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq)))
764 break;
765 }
766
767 if (optname == IP_ADD_MEMBERSHIP)
768 err = ip_mc_join_group(sk, &mreq);
769 else
770 err = ip_mc_leave_group(sk, &mreq);
771 break;
772 }
773 case IP_MSFILTER:
774 {
775 struct ip_msfilter *msf;
776
777 if (optlen < IP_MSFILTER_SIZE(0))
778 goto e_inval;
779 if (optlen > sysctl_optmem_max) {
780 err = -ENOBUFS;
781 break;
782 }
783 msf = kmalloc(optlen, GFP_KERNEL);
784 if (!msf) {
785 err = -ENOBUFS;
786 break;
787 }
788 err = -EFAULT;
789 if (copy_from_user(msf, optval, optlen)) {
790 kfree(msf);
791 break;
792 }
793 /* numsrc >= (1G-4) overflow in 32 bits */
794 if (msf->imsf_numsrc >= 0x3ffffffcU ||
795 msf->imsf_numsrc > sysctl_igmp_max_msf) {
796 kfree(msf);
797 err = -ENOBUFS;
798 break;
799 }
800 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
801 kfree(msf);
802 err = -EINVAL;
803 break;
804 }
805 err = ip_mc_msfilter(sk, msf, 0);
806 kfree(msf);
807 break;
808 }
809 case IP_BLOCK_SOURCE:
810 case IP_UNBLOCK_SOURCE:
811 case IP_ADD_SOURCE_MEMBERSHIP:
812 case IP_DROP_SOURCE_MEMBERSHIP:
813 {
814 struct ip_mreq_source mreqs;
815 int omode, add;
816
817 if (optlen != sizeof(struct ip_mreq_source))
818 goto e_inval;
819 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
820 err = -EFAULT;
821 break;
822 }
823 if (optname == IP_BLOCK_SOURCE) {
824 omode = MCAST_EXCLUDE;
825 add = 1;
826 } else if (optname == IP_UNBLOCK_SOURCE) {
827 omode = MCAST_EXCLUDE;
828 add = 0;
829 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
830 struct ip_mreqn mreq;
831
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)
837 break;
838 omode = MCAST_INCLUDE;
839 add = 1;
840 } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
841 omode = MCAST_INCLUDE;
842 add = 0;
843 }
844 err = ip_mc_source(add, omode, sk, &mreqs, 0);
845 break;
846 }
847 case MCAST_JOIN_GROUP:
848 case MCAST_LEAVE_GROUP:
849 {
850 struct group_req greq;
851 struct sockaddr_in *psin;
852 struct ip_mreqn mreq;
853
854 if (optlen < sizeof(struct group_req))
855 goto e_inval;
856 err = -EFAULT;
857 if (copy_from_user(&greq, optval, sizeof(greq)))
858 break;
859 psin = (struct sockaddr_in *)&greq.gr_group;
860 if (psin->sin_family != AF_INET)
861 goto e_inval;
862 memset(&mreq, 0, sizeof(mreq));
863 mreq.imr_multiaddr = psin->sin_addr;
864 mreq.imr_ifindex = greq.gr_interface;
865
866 if (optname == MCAST_JOIN_GROUP)
867 err = ip_mc_join_group(sk, &mreq);
868 else
869 err = ip_mc_leave_group(sk, &mreq);
870 break;
871 }
872 case MCAST_JOIN_SOURCE_GROUP:
873 case MCAST_LEAVE_SOURCE_GROUP:
874 case MCAST_BLOCK_SOURCE:
875 case MCAST_UNBLOCK_SOURCE:
876 {
877 struct group_source_req greqs;
878 struct ip_mreq_source mreqs;
879 struct sockaddr_in *psin;
880 int omode, add;
881
882 if (optlen != sizeof(struct group_source_req))
883 goto e_inval;
884 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
885 err = -EFAULT;
886 break;
887 }
888 if (greqs.gsr_group.ss_family != AF_INET ||
889 greqs.gsr_source.ss_family != AF_INET) {
890 err = -EADDRNOTAVAIL;
891 break;
892 }
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 */
898
899 if (optname == MCAST_BLOCK_SOURCE) {
900 omode = MCAST_EXCLUDE;
901 add = 1;
902 } else if (optname == MCAST_UNBLOCK_SOURCE) {
903 omode = MCAST_EXCLUDE;
904 add = 0;
905 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
906 struct ip_mreqn mreq;
907
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)
914 break;
915 greqs.gsr_interface = mreq.imr_ifindex;
916 omode = MCAST_INCLUDE;
917 add = 1;
918 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
919 omode = MCAST_INCLUDE;
920 add = 0;
921 }
922 err = ip_mc_source(add, omode, sk, &mreqs,
923 greqs.gsr_interface);
924 break;
925 }
926 case MCAST_MSFILTER:
927 {
928 struct sockaddr_in *psin;
929 struct ip_msfilter *msf = NULL;
930 struct group_filter *gsf = NULL;
931 int msize, i, ifindex;
932
933 if (optlen < GROUP_FILTER_SIZE(0))
934 goto e_inval;
935 if (optlen > sysctl_optmem_max) {
936 err = -ENOBUFS;
937 break;
938 }
939 gsf = kmalloc(optlen, GFP_KERNEL);
940 if (!gsf) {
941 err = -ENOBUFS;
942 break;
943 }
944 err = -EFAULT;
945 if (copy_from_user(gsf, optval, optlen))
946 goto mc_msf_out;
947
948 /* numsrc >= (4G-140)/128 overflow in 32 bits */
949 if (gsf->gf_numsrc >= 0x1ffffff ||
950 gsf->gf_numsrc > sysctl_igmp_max_msf) {
951 err = -ENOBUFS;
952 goto mc_msf_out;
953 }
954 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
955 err = -EINVAL;
956 goto mc_msf_out;
957 }
958 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
959 msf = kmalloc(msize, GFP_KERNEL);
960 if (!msf) {
961 err = -ENOBUFS;
962 goto mc_msf_out;
963 }
964 ifindex = gsf->gf_interface;
965 psin = (struct sockaddr_in *)&gsf->gf_group;
966 if (psin->sin_family != AF_INET) {
967 err = -EADDRNOTAVAIL;
968 goto mc_msf_out;
969 }
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];
977
978 if (psin->sin_family != AF_INET)
979 goto mc_msf_out;
980 msf->imsf_slist[i] = psin->sin_addr.s_addr;
981 }
982 kfree(gsf);
983 gsf = NULL;
984
985 err = ip_mc_msfilter(sk, msf, ifindex);
986 mc_msf_out:
987 kfree(msf);
988 kfree(gsf);
989 break;
990 }
991 case IP_MULTICAST_ALL:
992 if (optlen < 1)
993 goto e_inval;
994 if (val != 0 && val != 1)
995 goto e_inval;
996 inet->mc_all = val;
997 break;
998 case IP_ROUTER_ALERT:
999 err = ip_ra_control(sk, val ? 1 : 0, NULL);
1000 break;
1001
1002 case IP_FREEBIND:
1003 if (optlen < 1)
1004 goto e_inval;
1005 inet->freebind = !!val;
1006 break;
1007
1008 case IP_IPSEC_POLICY:
1009 case IP_XFRM_POLICY:
1010 err = -EPERM;
1011 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1012 break;
1013 err = xfrm_user_policy(sk, optname, optval, optlen);
1014 break;
1015
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)) {
1019 err = -EPERM;
1020 break;
1021 }
1022 if (optlen < 1)
1023 goto e_inval;
1024 inet->transparent = !!val;
1025 break;
1026
1027 case IP_MINTTL:
1028 if (optlen < 1)
1029 goto e_inval;
1030 if (val < 0 || val > 255)
1031 goto e_inval;
1032 inet->min_ttl = val;
1033 break;
1034
1035 default:
1036 err = -ENOPROTOOPT;
1037 break;
1038 }
1039 release_sock(sk);
1040 return err;
1041
1042 e_inval:
1043 release_sock(sk);
1044 return -EINVAL;
1045 }
1046
1047 /**
1048 * ipv4_pktinfo_prepare - transfert some info from rtable to skb
1049 * @sk: socket
1050 * @skb: buffer
1051 *
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 doesnt make cache line misses to read rtable.
1055 */
1056 void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb)
1057 {
1058 struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb);
1059
1060 if ((inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) &&
1061 skb_rtable(skb)) {
1062 pktinfo->ipi_ifindex = inet_iif(skb);
1063 pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb);
1064 } else {
1065 pktinfo->ipi_ifindex = 0;
1066 pktinfo->ipi_spec_dst.s_addr = 0;
1067 }
1068 skb_dst_drop(skb);
1069 }
1070
1071 int ip_setsockopt(struct sock *sk, int level,
1072 int optname, char __user *optval, unsigned int optlen)
1073 {
1074 int err;
1075
1076 if (level != SOL_IP)
1077 return -ENOPROTOOPT;
1078
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)) {
1086 lock_sock(sk);
1087 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
1088 release_sock(sk);
1089 }
1090 #endif
1091 return err;
1092 }
1093 EXPORT_SYMBOL(ip_setsockopt);
1094
1095 #ifdef CONFIG_COMPAT
1096 int compat_ip_setsockopt(struct sock *sk, int level, int optname,
1097 char __user *optval, unsigned int optlen)
1098 {
1099 int err;
1100
1101 if (level != SOL_IP)
1102 return -ENOPROTOOPT;
1103
1104 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
1105 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
1106 ip_setsockopt);
1107
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)) {
1115 lock_sock(sk);
1116 err = compat_nf_setsockopt(sk, PF_INET, optname,
1117 optval, optlen);
1118 release_sock(sk);
1119 }
1120 #endif
1121 return err;
1122 }
1123 EXPORT_SYMBOL(compat_ip_setsockopt);
1124 #endif
1125
1126 /*
1127 * Get the options. Note for future reference. The GET of IP options gets
1128 * the _received_ ones. The set sets the _sent_ ones.
1129 */
1130
1131 static int do_ip_getsockopt(struct sock *sk, int level, int optname,
1132 char __user *optval, int __user *optlen, unsigned int flags)
1133 {
1134 struct inet_sock *inet = inet_sk(sk);
1135 int val;
1136 int len;
1137
1138 if (level != SOL_IP)
1139 return -EOPNOTSUPP;
1140
1141 if (ip_mroute_opt(optname))
1142 return ip_mroute_getsockopt(sk, optname, optval, optlen);
1143
1144 if (get_user(len, optlen))
1145 return -EFAULT;
1146 if (len < 0)
1147 return -EINVAL;
1148
1149 lock_sock(sk);
1150
1151 switch (optname) {
1152 case IP_OPTIONS:
1153 {
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;
1157
1158 inet_opt = rcu_dereference_protected(inet->inet_opt,
1159 sock_owned_by_user(sk));
1160 opt->optlen = 0;
1161 if (inet_opt)
1162 memcpy(optbuf, &inet_opt->opt,
1163 sizeof(struct ip_options) +
1164 inet_opt->opt.optlen);
1165 release_sock(sk);
1166
1167 if (opt->optlen == 0)
1168 return put_user(0, optlen);
1169
1170 ip_options_undo(opt);
1171
1172 len = min_t(unsigned int, len, opt->optlen);
1173 if (put_user(len, optlen))
1174 return -EFAULT;
1175 if (copy_to_user(optval, opt->__data, len))
1176 return -EFAULT;
1177 return 0;
1178 }
1179 case IP_PKTINFO:
1180 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
1181 break;
1182 case IP_RECVTTL:
1183 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
1184 break;
1185 case IP_RECVTOS:
1186 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
1187 break;
1188 case IP_RECVOPTS:
1189 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
1190 break;
1191 case IP_RETOPTS:
1192 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
1193 break;
1194 case IP_PASSSEC:
1195 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
1196 break;
1197 case IP_RECVORIGDSTADDR:
1198 val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0;
1199 break;
1200 case IP_TOS:
1201 val = inet->tos;
1202 break;
1203 case IP_TTL:
1204 val = (inet->uc_ttl == -1 ?
1205 sysctl_ip_default_ttl :
1206 inet->uc_ttl);
1207 break;
1208 case IP_HDRINCL:
1209 val = inet->hdrincl;
1210 break;
1211 case IP_NODEFRAG:
1212 val = inet->nodefrag;
1213 break;
1214 case IP_MTU_DISCOVER:
1215 val = inet->pmtudisc;
1216 break;
1217 case IP_MTU:
1218 {
1219 struct dst_entry *dst;
1220 val = 0;
1221 dst = sk_dst_get(sk);
1222 if (dst) {
1223 val = dst_mtu(dst);
1224 dst_release(dst);
1225 }
1226 if (!val) {
1227 release_sock(sk);
1228 return -ENOTCONN;
1229 }
1230 break;
1231 }
1232 case IP_RECVERR:
1233 val = inet->recverr;
1234 break;
1235 case IP_MULTICAST_TTL:
1236 val = inet->mc_ttl;
1237 break;
1238 case IP_MULTICAST_LOOP:
1239 val = inet->mc_loop;
1240 break;
1241 case IP_UNICAST_IF:
1242 val = (__force int)htonl((__u32) inet->uc_index);
1243 break;
1244 case IP_MULTICAST_IF:
1245 {
1246 struct in_addr addr;
1247 len = min_t(unsigned int, len, sizeof(struct in_addr));
1248 addr.s_addr = inet->mc_addr;
1249 release_sock(sk);
1250
1251 if (put_user(len, optlen))
1252 return -EFAULT;
1253 if (copy_to_user(optval, &addr, len))
1254 return -EFAULT;
1255 return 0;
1256 }
1257 case IP_MSFILTER:
1258 {
1259 struct ip_msfilter msf;
1260 int err;
1261
1262 if (len < IP_MSFILTER_SIZE(0)) {
1263 release_sock(sk);
1264 return -EINVAL;
1265 }
1266 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
1267 release_sock(sk);
1268 return -EFAULT;
1269 }
1270 err = ip_mc_msfget(sk, &msf,
1271 (struct ip_msfilter __user *)optval, optlen);
1272 release_sock(sk);
1273 return err;
1274 }
1275 case MCAST_MSFILTER:
1276 {
1277 struct group_filter gsf;
1278 int err;
1279
1280 if (len < GROUP_FILTER_SIZE(0)) {
1281 release_sock(sk);
1282 return -EINVAL;
1283 }
1284 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
1285 release_sock(sk);
1286 return -EFAULT;
1287 }
1288 err = ip_mc_gsfget(sk, &gsf,
1289 (struct group_filter __user *)optval,
1290 optlen);
1291 release_sock(sk);
1292 return err;
1293 }
1294 case IP_MULTICAST_ALL:
1295 val = inet->mc_all;
1296 break;
1297 case IP_PKTOPTIONS:
1298 {
1299 struct msghdr msg;
1300
1301 release_sock(sk);
1302
1303 if (sk->sk_type != SOCK_STREAM)
1304 return -ENOPROTOOPT;
1305
1306 msg.msg_control = optval;
1307 msg.msg_controllen = len;
1308 msg.msg_flags = flags;
1309
1310 if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
1311 struct in_pktinfo info;
1312
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);
1317 }
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);
1321 }
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);
1325 }
1326 len -= msg.msg_controllen;
1327 return put_user(len, optlen);
1328 }
1329 case IP_FREEBIND:
1330 val = inet->freebind;
1331 break;
1332 case IP_TRANSPARENT:
1333 val = inet->transparent;
1334 break;
1335 case IP_MINTTL:
1336 val = inet->min_ttl;
1337 break;
1338 default:
1339 release_sock(sk);
1340 return -ENOPROTOOPT;
1341 }
1342 release_sock(sk);
1343
1344 if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) {
1345 unsigned char ucval = (unsigned char)val;
1346 len = 1;
1347 if (put_user(len, optlen))
1348 return -EFAULT;
1349 if (copy_to_user(optval, &ucval, 1))
1350 return -EFAULT;
1351 } else {
1352 len = min_t(unsigned int, sizeof(int), len);
1353 if (put_user(len, optlen))
1354 return -EFAULT;
1355 if (copy_to_user(optval, &val, len))
1356 return -EFAULT;
1357 }
1358 return 0;
1359 }
1360
1361 int ip_getsockopt(struct sock *sk, int level,
1362 int optname, char __user *optval, int __user *optlen)
1363 {
1364 int err;
1365
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)) {
1371 int len;
1372
1373 if (get_user(len, optlen))
1374 return -EFAULT;
1375
1376 lock_sock(sk);
1377 err = nf_getsockopt(sk, PF_INET, optname, optval,
1378 &len);
1379 release_sock(sk);
1380 if (err >= 0)
1381 err = put_user(len, optlen);
1382 return err;
1383 }
1384 #endif
1385 return err;
1386 }
1387 EXPORT_SYMBOL(ip_getsockopt);
1388
1389 #ifdef CONFIG_COMPAT
1390 int compat_ip_getsockopt(struct sock *sk, int level, int optname,
1391 char __user *optval, int __user *optlen)
1392 {
1393 int err;
1394
1395 if (optname == MCAST_MSFILTER)
1396 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1397 ip_getsockopt);
1398
1399 err = do_ip_getsockopt(sk, level, optname, optval, optlen,
1400 MSG_CMSG_COMPAT);
1401
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)) {
1406 int len;
1407
1408 if (get_user(len, optlen))
1409 return -EFAULT;
1410
1411 lock_sock(sk);
1412 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
1413 release_sock(sk);
1414 if (err >= 0)
1415 err = put_user(len, optlen);
1416 return err;
1417 }
1418 #endif
1419 return err;
1420 }
1421 EXPORT_SYMBOL(compat_ip_getsockopt);
1422 #endif
Linux kernel - Deliverables
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