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[mirror_ubuntu-artful-kernel.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 #include <net/checksum.h>
41 #if IS_ENABLED(CONFIG_IPV6)
42 #include <net/transp_v6.h>
43 #endif
44 #include <net/ip_fib.h>
45
46 #include <linux/errqueue.h>
47 #include <asm/uaccess.h>
48
49 /*
50 * SOL_IP control messages.
51 */
52
53 static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb)
54 {
55 struct in_pktinfo info = *PKTINFO_SKB_CB(skb);
56
57 info.ipi_addr.s_addr = ip_hdr(skb)->daddr;
58
59 put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
60 }
61
62 static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb)
63 {
64 int ttl = ip_hdr(skb)->ttl;
65 put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl);
66 }
67
68 static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb)
69 {
70 put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos);
71 }
72
73 static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb)
74 {
75 if (IPCB(skb)->opt.optlen == 0)
76 return;
77
78 put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen,
79 ip_hdr(skb) + 1);
80 }
81
82
83 static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb)
84 {
85 unsigned char optbuf[sizeof(struct ip_options) + 40];
86 struct ip_options *opt = (struct ip_options *)optbuf;
87
88 if (IPCB(skb)->opt.optlen == 0)
89 return;
90
91 if (ip_options_echo(opt, skb)) {
92 msg->msg_flags |= MSG_CTRUNC;
93 return;
94 }
95 ip_options_undo(opt);
96
97 put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data);
98 }
99
100 static void ip_cmsg_recv_checksum(struct msghdr *msg, struct sk_buff *skb,
101 int offset)
102 {
103 __wsum csum = skb->csum;
104
105 if (skb->ip_summed != CHECKSUM_COMPLETE)
106 return;
107
108 if (offset != 0)
109 csum = csum_sub(csum, csum_partial(skb->data, offset, 0));
110
111 put_cmsg(msg, SOL_IP, IP_CHECKSUM, sizeof(__wsum), &csum);
112 }
113
114 static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
115 {
116 char *secdata;
117 u32 seclen, secid;
118 int err;
119
120 err = security_socket_getpeersec_dgram(NULL, skb, &secid);
121 if (err)
122 return;
123
124 err = security_secid_to_secctx(secid, &secdata, &seclen);
125 if (err)
126 return;
127
128 put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata);
129 security_release_secctx(secdata, seclen);
130 }
131
132 static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb)
133 {
134 struct sockaddr_in sin;
135 const struct iphdr *iph = ip_hdr(skb);
136 __be16 *ports = (__be16 *)skb_transport_header(skb);
137
138 if (skb_transport_offset(skb) + 4 > skb->len)
139 return;
140
141 /* All current transport protocols have the port numbers in the
142 * first four bytes of the transport header and this function is
143 * written with this assumption in mind.
144 */
145
146 sin.sin_family = AF_INET;
147 sin.sin_addr.s_addr = iph->daddr;
148 sin.sin_port = ports[1];
149 memset(sin.sin_zero, 0, sizeof(sin.sin_zero));
150
151 put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin);
152 }
153
154 void ip_cmsg_recv_offset(struct msghdr *msg, struct sk_buff *skb,
155 int offset)
156 {
157 struct inet_sock *inet = inet_sk(skb->sk);
158 unsigned int flags = inet->cmsg_flags;
159
160 /* Ordered by supposed usage frequency */
161 if (flags & IP_CMSG_PKTINFO) {
162 ip_cmsg_recv_pktinfo(msg, skb);
163
164 flags &= ~IP_CMSG_PKTINFO;
165 if (!flags)
166 return;
167 }
168
169 if (flags & IP_CMSG_TTL) {
170 ip_cmsg_recv_ttl(msg, skb);
171
172 flags &= ~IP_CMSG_TTL;
173 if (!flags)
174 return;
175 }
176
177 if (flags & IP_CMSG_TOS) {
178 ip_cmsg_recv_tos(msg, skb);
179
180 flags &= ~IP_CMSG_TOS;
181 if (!flags)
182 return;
183 }
184
185 if (flags & IP_CMSG_RECVOPTS) {
186 ip_cmsg_recv_opts(msg, skb);
187
188 flags &= ~IP_CMSG_RECVOPTS;
189 if (!flags)
190 return;
191 }
192
193 if (flags & IP_CMSG_RETOPTS) {
194 ip_cmsg_recv_retopts(msg, skb);
195
196 flags &= ~IP_CMSG_RETOPTS;
197 if (!flags)
198 return;
199 }
200
201 if (flags & IP_CMSG_PASSSEC) {
202 ip_cmsg_recv_security(msg, skb);
203
204 flags &= ~IP_CMSG_PASSSEC;
205 if (!flags)
206 return;
207 }
208
209 if (flags & IP_CMSG_ORIGDSTADDR) {
210 ip_cmsg_recv_dstaddr(msg, skb);
211
212 flags &= ~IP_CMSG_ORIGDSTADDR;
213 if (!flags)
214 return;
215 }
216
217 if (flags & IP_CMSG_CHECKSUM)
218 ip_cmsg_recv_checksum(msg, skb, offset);
219 }
220 EXPORT_SYMBOL(ip_cmsg_recv_offset);
221
222 int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc,
223 bool allow_ipv6)
224 {
225 int err, val;
226 struct cmsghdr *cmsg;
227
228 for_each_cmsghdr(cmsg, msg) {
229 if (!CMSG_OK(msg, cmsg))
230 return -EINVAL;
231 #if IS_ENABLED(CONFIG_IPV6)
232 if (allow_ipv6 &&
233 cmsg->cmsg_level == SOL_IPV6 &&
234 cmsg->cmsg_type == IPV6_PKTINFO) {
235 struct in6_pktinfo *src_info;
236
237 if (cmsg->cmsg_len < CMSG_LEN(sizeof(*src_info)))
238 return -EINVAL;
239 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
240 if (!ipv6_addr_v4mapped(&src_info->ipi6_addr))
241 return -EINVAL;
242 ipc->oif = src_info->ipi6_ifindex;
243 ipc->addr = src_info->ipi6_addr.s6_addr32[3];
244 continue;
245 }
246 #endif
247 if (cmsg->cmsg_level != SOL_IP)
248 continue;
249 switch (cmsg->cmsg_type) {
250 case IP_RETOPTS:
251 err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
252 err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg),
253 err < 40 ? err : 40);
254 if (err)
255 return err;
256 break;
257 case IP_PKTINFO:
258 {
259 struct in_pktinfo *info;
260 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
261 return -EINVAL;
262 info = (struct in_pktinfo *)CMSG_DATA(cmsg);
263 ipc->oif = info->ipi_ifindex;
264 ipc->addr = info->ipi_spec_dst.s_addr;
265 break;
266 }
267 case IP_TTL:
268 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
269 return -EINVAL;
270 val = *(int *)CMSG_DATA(cmsg);
271 if (val < 1 || val > 255)
272 return -EINVAL;
273 ipc->ttl = val;
274 break;
275 case IP_TOS:
276 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
277 return -EINVAL;
278 val = *(int *)CMSG_DATA(cmsg);
279 if (val < 0 || val > 255)
280 return -EINVAL;
281 ipc->tos = val;
282 ipc->priority = rt_tos2priority(ipc->tos);
283 break;
284
285 default:
286 return -EINVAL;
287 }
288 }
289 return 0;
290 }
291
292
293 /* Special input handler for packets caught by router alert option.
294 They are selected only by protocol field, and then processed likely
295 local ones; but only if someone wants them! Otherwise, router
296 not running rsvpd will kill RSVP.
297
298 It is user level problem, what it will make with them.
299 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
300 but receiver should be enough clever f.e. to forward mtrace requests,
301 sent to multicast group to reach destination designated router.
302 */
303 struct ip_ra_chain __rcu *ip_ra_chain;
304 static DEFINE_SPINLOCK(ip_ra_lock);
305
306
307 static void ip_ra_destroy_rcu(struct rcu_head *head)
308 {
309 struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu);
310
311 sock_put(ra->saved_sk);
312 kfree(ra);
313 }
314
315 int ip_ra_control(struct sock *sk, unsigned char on,
316 void (*destructor)(struct sock *))
317 {
318 struct ip_ra_chain *ra, *new_ra;
319 struct ip_ra_chain __rcu **rap;
320
321 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW)
322 return -EINVAL;
323
324 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
325
326 spin_lock_bh(&ip_ra_lock);
327 for (rap = &ip_ra_chain;
328 (ra = rcu_dereference_protected(*rap,
329 lockdep_is_held(&ip_ra_lock))) != NULL;
330 rap = &ra->next) {
331 if (ra->sk == sk) {
332 if (on) {
333 spin_unlock_bh(&ip_ra_lock);
334 kfree(new_ra);
335 return -EADDRINUSE;
336 }
337 /* dont let ip_call_ra_chain() use sk again */
338 ra->sk = NULL;
339 RCU_INIT_POINTER(*rap, ra->next);
340 spin_unlock_bh(&ip_ra_lock);
341
342 if (ra->destructor)
343 ra->destructor(sk);
344 /*
345 * Delay sock_put(sk) and kfree(ra) after one rcu grace
346 * period. This guarantee ip_call_ra_chain() dont need
347 * to mess with socket refcounts.
348 */
349 ra->saved_sk = sk;
350 call_rcu(&ra->rcu, ip_ra_destroy_rcu);
351 return 0;
352 }
353 }
354 if (!new_ra) {
355 spin_unlock_bh(&ip_ra_lock);
356 return -ENOBUFS;
357 }
358 new_ra->sk = sk;
359 new_ra->destructor = destructor;
360
361 RCU_INIT_POINTER(new_ra->next, ra);
362 rcu_assign_pointer(*rap, new_ra);
363 sock_hold(sk);
364 spin_unlock_bh(&ip_ra_lock);
365
366 return 0;
367 }
368
369 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
370 __be16 port, u32 info, u8 *payload)
371 {
372 struct sock_exterr_skb *serr;
373
374 skb = skb_clone(skb, GFP_ATOMIC);
375 if (!skb)
376 return;
377
378 serr = SKB_EXT_ERR(skb);
379 serr->ee.ee_errno = err;
380 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
381 serr->ee.ee_type = icmp_hdr(skb)->type;
382 serr->ee.ee_code = icmp_hdr(skb)->code;
383 serr->ee.ee_pad = 0;
384 serr->ee.ee_info = info;
385 serr->ee.ee_data = 0;
386 serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) -
387 skb_network_header(skb);
388 serr->port = port;
389
390 if (skb_pull(skb, payload - skb->data)) {
391 skb_reset_transport_header(skb);
392 if (sock_queue_err_skb(sk, skb) == 0)
393 return;
394 }
395 kfree_skb(skb);
396 }
397
398 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info)
399 {
400 struct inet_sock *inet = inet_sk(sk);
401 struct sock_exterr_skb *serr;
402 struct iphdr *iph;
403 struct sk_buff *skb;
404
405 if (!inet->recverr)
406 return;
407
408 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
409 if (!skb)
410 return;
411
412 skb_put(skb, sizeof(struct iphdr));
413 skb_reset_network_header(skb);
414 iph = ip_hdr(skb);
415 iph->daddr = daddr;
416
417 serr = SKB_EXT_ERR(skb);
418 serr->ee.ee_errno = err;
419 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
420 serr->ee.ee_type = 0;
421 serr->ee.ee_code = 0;
422 serr->ee.ee_pad = 0;
423 serr->ee.ee_info = info;
424 serr->ee.ee_data = 0;
425 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
426 serr->port = port;
427
428 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
429 skb_reset_transport_header(skb);
430
431 if (sock_queue_err_skb(sk, skb))
432 kfree_skb(skb);
433 }
434
435 /* For some errors we have valid addr_offset even with zero payload and
436 * zero port. Also, addr_offset should be supported if port is set.
437 */
438 static inline bool ipv4_datagram_support_addr(struct sock_exterr_skb *serr)
439 {
440 return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
441 serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port;
442 }
443
444 /* IPv4 supports cmsg on all imcp errors and some timestamps
445 *
446 * Timestamp code paths do not initialize the fields expected by cmsg:
447 * the PKTINFO fields in skb->cb[]. Fill those in here.
448 */
449 static bool ipv4_datagram_support_cmsg(const struct sock *sk,
450 struct sk_buff *skb,
451 int ee_origin)
452 {
453 struct in_pktinfo *info;
454
455 if (ee_origin == SO_EE_ORIGIN_ICMP)
456 return true;
457
458 if (ee_origin == SO_EE_ORIGIN_LOCAL)
459 return false;
460
461 /* Support IP_PKTINFO on tstamp packets if requested, to correlate
462 * timestamp with egress dev. Not possible for packets without dev
463 * or without payload (SOF_TIMESTAMPING_OPT_TSONLY).
464 */
465 if ((!(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_CMSG)) ||
466 (!skb->dev))
467 return false;
468
469 info = PKTINFO_SKB_CB(skb);
470 info->ipi_spec_dst.s_addr = ip_hdr(skb)->saddr;
471 info->ipi_ifindex = skb->dev->ifindex;
472 return true;
473 }
474
475 /*
476 * Handle MSG_ERRQUEUE
477 */
478 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
479 {
480 struct sock_exterr_skb *serr;
481 struct sk_buff *skb;
482 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name);
483 struct {
484 struct sock_extended_err ee;
485 struct sockaddr_in offender;
486 } errhdr;
487 int err;
488 int copied;
489
490 WARN_ON_ONCE(sk->sk_family == AF_INET6);
491
492 err = -EAGAIN;
493 skb = sock_dequeue_err_skb(sk);
494 if (!skb)
495 goto out;
496
497 copied = skb->len;
498 if (copied > len) {
499 msg->msg_flags |= MSG_TRUNC;
500 copied = len;
501 }
502 err = skb_copy_datagram_msg(skb, 0, msg, copied);
503 if (err)
504 goto out_free_skb;
505
506 sock_recv_timestamp(msg, sk, skb);
507
508 serr = SKB_EXT_ERR(skb);
509
510 if (sin && ipv4_datagram_support_addr(serr)) {
511 sin->sin_family = AF_INET;
512 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) +
513 serr->addr_offset);
514 sin->sin_port = serr->port;
515 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
516 *addr_len = sizeof(*sin);
517 }
518
519 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
520 sin = &errhdr.offender;
521 memset(sin, 0, sizeof(*sin));
522
523 if (ipv4_datagram_support_cmsg(sk, skb, serr->ee.ee_origin)) {
524 sin->sin_family = AF_INET;
525 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
526 if (inet_sk(sk)->cmsg_flags)
527 ip_cmsg_recv(msg, skb);
528 }
529
530 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
531
532 /* Now we could try to dump offended packet options */
533
534 msg->msg_flags |= MSG_ERRQUEUE;
535 err = copied;
536
537 out_free_skb:
538 kfree_skb(skb);
539 out:
540 return err;
541 }
542
543
544 /*
545 * Socket option code for IP. This is the end of the line after any
546 * TCP,UDP etc options on an IP socket.
547 */
548 static bool setsockopt_needs_rtnl(int optname)
549 {
550 switch (optname) {
551 case IP_ADD_MEMBERSHIP:
552 case IP_ADD_SOURCE_MEMBERSHIP:
553 case IP_BLOCK_SOURCE:
554 case IP_DROP_MEMBERSHIP:
555 case IP_DROP_SOURCE_MEMBERSHIP:
556 case IP_MSFILTER:
557 case IP_UNBLOCK_SOURCE:
558 case MCAST_BLOCK_SOURCE:
559 case MCAST_MSFILTER:
560 case MCAST_JOIN_GROUP:
561 case MCAST_JOIN_SOURCE_GROUP:
562 case MCAST_LEAVE_GROUP:
563 case MCAST_LEAVE_SOURCE_GROUP:
564 case MCAST_UNBLOCK_SOURCE:
565 return true;
566 }
567 return false;
568 }
569
570 static int do_ip_setsockopt(struct sock *sk, int level,
571 int optname, char __user *optval, unsigned int optlen)
572 {
573 struct inet_sock *inet = inet_sk(sk);
574 int val = 0, err;
575 bool needs_rtnl = setsockopt_needs_rtnl(optname);
576
577 switch (optname) {
578 case IP_PKTINFO:
579 case IP_RECVTTL:
580 case IP_RECVOPTS:
581 case IP_RECVTOS:
582 case IP_RETOPTS:
583 case IP_TOS:
584 case IP_TTL:
585 case IP_HDRINCL:
586 case IP_MTU_DISCOVER:
587 case IP_RECVERR:
588 case IP_ROUTER_ALERT:
589 case IP_FREEBIND:
590 case IP_PASSSEC:
591 case IP_TRANSPARENT:
592 case IP_MINTTL:
593 case IP_NODEFRAG:
594 case IP_BIND_ADDRESS_NO_PORT:
595 case IP_UNICAST_IF:
596 case IP_MULTICAST_TTL:
597 case IP_MULTICAST_ALL:
598 case IP_MULTICAST_LOOP:
599 case IP_RECVORIGDSTADDR:
600 case IP_CHECKSUM:
601 if (optlen >= sizeof(int)) {
602 if (get_user(val, (int __user *) optval))
603 return -EFAULT;
604 } else if (optlen >= sizeof(char)) {
605 unsigned char ucval;
606
607 if (get_user(ucval, (unsigned char __user *) optval))
608 return -EFAULT;
609 val = (int) ucval;
610 }
611 }
612
613 /* If optlen==0, it is equivalent to val == 0 */
614
615 if (ip_mroute_opt(optname))
616 return ip_mroute_setsockopt(sk, optname, optval, optlen);
617
618 err = 0;
619 if (needs_rtnl)
620 rtnl_lock();
621 lock_sock(sk);
622
623 switch (optname) {
624 case IP_OPTIONS:
625 {
626 struct ip_options_rcu *old, *opt = NULL;
627
628 if (optlen > 40)
629 goto e_inval;
630 err = ip_options_get_from_user(sock_net(sk), &opt,
631 optval, optlen);
632 if (err)
633 break;
634 old = rcu_dereference_protected(inet->inet_opt,
635 sock_owned_by_user(sk));
636 if (inet->is_icsk) {
637 struct inet_connection_sock *icsk = inet_csk(sk);
638 #if IS_ENABLED(CONFIG_IPV6)
639 if (sk->sk_family == PF_INET ||
640 (!((1 << sk->sk_state) &
641 (TCPF_LISTEN | TCPF_CLOSE)) &&
642 inet->inet_daddr != LOOPBACK4_IPV6)) {
643 #endif
644 if (old)
645 icsk->icsk_ext_hdr_len -= old->opt.optlen;
646 if (opt)
647 icsk->icsk_ext_hdr_len += opt->opt.optlen;
648 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
649 #if IS_ENABLED(CONFIG_IPV6)
650 }
651 #endif
652 }
653 rcu_assign_pointer(inet->inet_opt, opt);
654 if (old)
655 kfree_rcu(old, rcu);
656 break;
657 }
658 case IP_PKTINFO:
659 if (val)
660 inet->cmsg_flags |= IP_CMSG_PKTINFO;
661 else
662 inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
663 break;
664 case IP_RECVTTL:
665 if (val)
666 inet->cmsg_flags |= IP_CMSG_TTL;
667 else
668 inet->cmsg_flags &= ~IP_CMSG_TTL;
669 break;
670 case IP_RECVTOS:
671 if (val)
672 inet->cmsg_flags |= IP_CMSG_TOS;
673 else
674 inet->cmsg_flags &= ~IP_CMSG_TOS;
675 break;
676 case IP_RECVOPTS:
677 if (val)
678 inet->cmsg_flags |= IP_CMSG_RECVOPTS;
679 else
680 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
681 break;
682 case IP_RETOPTS:
683 if (val)
684 inet->cmsg_flags |= IP_CMSG_RETOPTS;
685 else
686 inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
687 break;
688 case IP_PASSSEC:
689 if (val)
690 inet->cmsg_flags |= IP_CMSG_PASSSEC;
691 else
692 inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
693 break;
694 case IP_RECVORIGDSTADDR:
695 if (val)
696 inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR;
697 else
698 inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR;
699 break;
700 case IP_CHECKSUM:
701 if (val) {
702 if (!(inet->cmsg_flags & IP_CMSG_CHECKSUM)) {
703 inet_inc_convert_csum(sk);
704 inet->cmsg_flags |= IP_CMSG_CHECKSUM;
705 }
706 } else {
707 if (inet->cmsg_flags & IP_CMSG_CHECKSUM) {
708 inet_dec_convert_csum(sk);
709 inet->cmsg_flags &= ~IP_CMSG_CHECKSUM;
710 }
711 }
712 break;
713 case IP_TOS: /* This sets both TOS and Precedence */
714 if (sk->sk_type == SOCK_STREAM) {
715 val &= ~INET_ECN_MASK;
716 val |= inet->tos & INET_ECN_MASK;
717 }
718 if (inet->tos != val) {
719 inet->tos = val;
720 sk->sk_priority = rt_tos2priority(val);
721 sk_dst_reset(sk);
722 }
723 break;
724 case IP_TTL:
725 if (optlen < 1)
726 goto e_inval;
727 if (val != -1 && (val < 1 || val > 255))
728 goto e_inval;
729 inet->uc_ttl = val;
730 break;
731 case IP_HDRINCL:
732 if (sk->sk_type != SOCK_RAW) {
733 err = -ENOPROTOOPT;
734 break;
735 }
736 inet->hdrincl = val ? 1 : 0;
737 break;
738 case IP_NODEFRAG:
739 if (sk->sk_type != SOCK_RAW) {
740 err = -ENOPROTOOPT;
741 break;
742 }
743 inet->nodefrag = val ? 1 : 0;
744 break;
745 case IP_BIND_ADDRESS_NO_PORT:
746 inet->bind_address_no_port = val ? 1 : 0;
747 break;
748 case IP_MTU_DISCOVER:
749 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_OMIT)
750 goto e_inval;
751 inet->pmtudisc = val;
752 break;
753 case IP_RECVERR:
754 inet->recverr = !!val;
755 if (!val)
756 skb_queue_purge(&sk->sk_error_queue);
757 break;
758 case IP_MULTICAST_TTL:
759 if (sk->sk_type == SOCK_STREAM)
760 goto e_inval;
761 if (optlen < 1)
762 goto e_inval;
763 if (val == -1)
764 val = 1;
765 if (val < 0 || val > 255)
766 goto e_inval;
767 inet->mc_ttl = val;
768 break;
769 case IP_MULTICAST_LOOP:
770 if (optlen < 1)
771 goto e_inval;
772 inet->mc_loop = !!val;
773 break;
774 case IP_UNICAST_IF:
775 {
776 struct net_device *dev = NULL;
777 int ifindex;
778
779 if (optlen != sizeof(int))
780 goto e_inval;
781
782 ifindex = (__force int)ntohl((__force __be32)val);
783 if (ifindex == 0) {
784 inet->uc_index = 0;
785 err = 0;
786 break;
787 }
788
789 dev = dev_get_by_index(sock_net(sk), ifindex);
790 err = -EADDRNOTAVAIL;
791 if (!dev)
792 break;
793 dev_put(dev);
794
795 err = -EINVAL;
796 if (sk->sk_bound_dev_if)
797 break;
798
799 inet->uc_index = ifindex;
800 err = 0;
801 break;
802 }
803 case IP_MULTICAST_IF:
804 {
805 struct ip_mreqn mreq;
806 struct net_device *dev = NULL;
807
808 if (sk->sk_type == SOCK_STREAM)
809 goto e_inval;
810 /*
811 * Check the arguments are allowable
812 */
813
814 if (optlen < sizeof(struct in_addr))
815 goto e_inval;
816
817 err = -EFAULT;
818 if (optlen >= sizeof(struct ip_mreqn)) {
819 if (copy_from_user(&mreq, optval, sizeof(mreq)))
820 break;
821 } else {
822 memset(&mreq, 0, sizeof(mreq));
823 if (optlen >= sizeof(struct ip_mreq)) {
824 if (copy_from_user(&mreq, optval,
825 sizeof(struct ip_mreq)))
826 break;
827 } else if (optlen >= sizeof(struct in_addr)) {
828 if (copy_from_user(&mreq.imr_address, optval,
829 sizeof(struct in_addr)))
830 break;
831 }
832 }
833
834 if (!mreq.imr_ifindex) {
835 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) {
836 inet->mc_index = 0;
837 inet->mc_addr = 0;
838 err = 0;
839 break;
840 }
841 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr);
842 if (dev)
843 mreq.imr_ifindex = dev->ifindex;
844 } else
845 dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex);
846
847
848 err = -EADDRNOTAVAIL;
849 if (!dev)
850 break;
851 dev_put(dev);
852
853 err = -EINVAL;
854 if (sk->sk_bound_dev_if &&
855 mreq.imr_ifindex != sk->sk_bound_dev_if)
856 break;
857
858 inet->mc_index = mreq.imr_ifindex;
859 inet->mc_addr = mreq.imr_address.s_addr;
860 err = 0;
861 break;
862 }
863
864 case IP_ADD_MEMBERSHIP:
865 case IP_DROP_MEMBERSHIP:
866 {
867 struct ip_mreqn mreq;
868
869 err = -EPROTO;
870 if (inet_sk(sk)->is_icsk)
871 break;
872
873 if (optlen < sizeof(struct ip_mreq))
874 goto e_inval;
875 err = -EFAULT;
876 if (optlen >= sizeof(struct ip_mreqn)) {
877 if (copy_from_user(&mreq, optval, sizeof(mreq)))
878 break;
879 } else {
880 memset(&mreq, 0, sizeof(mreq));
881 if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq)))
882 break;
883 }
884
885 if (optname == IP_ADD_MEMBERSHIP)
886 err = ip_mc_join_group(sk, &mreq);
887 else
888 err = ip_mc_leave_group(sk, &mreq);
889 break;
890 }
891 case IP_MSFILTER:
892 {
893 struct ip_msfilter *msf;
894
895 if (optlen < IP_MSFILTER_SIZE(0))
896 goto e_inval;
897 if (optlen > sysctl_optmem_max) {
898 err = -ENOBUFS;
899 break;
900 }
901 msf = kmalloc(optlen, GFP_KERNEL);
902 if (!msf) {
903 err = -ENOBUFS;
904 break;
905 }
906 err = -EFAULT;
907 if (copy_from_user(msf, optval, optlen)) {
908 kfree(msf);
909 break;
910 }
911 /* numsrc >= (1G-4) overflow in 32 bits */
912 if (msf->imsf_numsrc >= 0x3ffffffcU ||
913 msf->imsf_numsrc > sysctl_igmp_max_msf) {
914 kfree(msf);
915 err = -ENOBUFS;
916 break;
917 }
918 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
919 kfree(msf);
920 err = -EINVAL;
921 break;
922 }
923 err = ip_mc_msfilter(sk, msf, 0);
924 kfree(msf);
925 break;
926 }
927 case IP_BLOCK_SOURCE:
928 case IP_UNBLOCK_SOURCE:
929 case IP_ADD_SOURCE_MEMBERSHIP:
930 case IP_DROP_SOURCE_MEMBERSHIP:
931 {
932 struct ip_mreq_source mreqs;
933 int omode, add;
934
935 if (optlen != sizeof(struct ip_mreq_source))
936 goto e_inval;
937 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
938 err = -EFAULT;
939 break;
940 }
941 if (optname == IP_BLOCK_SOURCE) {
942 omode = MCAST_EXCLUDE;
943 add = 1;
944 } else if (optname == IP_UNBLOCK_SOURCE) {
945 omode = MCAST_EXCLUDE;
946 add = 0;
947 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
948 struct ip_mreqn mreq;
949
950 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
951 mreq.imr_address.s_addr = mreqs.imr_interface;
952 mreq.imr_ifindex = 0;
953 err = ip_mc_join_group(sk, &mreq);
954 if (err && err != -EADDRINUSE)
955 break;
956 omode = MCAST_INCLUDE;
957 add = 1;
958 } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
959 omode = MCAST_INCLUDE;
960 add = 0;
961 }
962 err = ip_mc_source(add, omode, sk, &mreqs, 0);
963 break;
964 }
965 case MCAST_JOIN_GROUP:
966 case MCAST_LEAVE_GROUP:
967 {
968 struct group_req greq;
969 struct sockaddr_in *psin;
970 struct ip_mreqn mreq;
971
972 if (optlen < sizeof(struct group_req))
973 goto e_inval;
974 err = -EFAULT;
975 if (copy_from_user(&greq, optval, sizeof(greq)))
976 break;
977 psin = (struct sockaddr_in *)&greq.gr_group;
978 if (psin->sin_family != AF_INET)
979 goto e_inval;
980 memset(&mreq, 0, sizeof(mreq));
981 mreq.imr_multiaddr = psin->sin_addr;
982 mreq.imr_ifindex = greq.gr_interface;
983
984 if (optname == MCAST_JOIN_GROUP)
985 err = ip_mc_join_group(sk, &mreq);
986 else
987 err = ip_mc_leave_group(sk, &mreq);
988 break;
989 }
990 case MCAST_JOIN_SOURCE_GROUP:
991 case MCAST_LEAVE_SOURCE_GROUP:
992 case MCAST_BLOCK_SOURCE:
993 case MCAST_UNBLOCK_SOURCE:
994 {
995 struct group_source_req greqs;
996 struct ip_mreq_source mreqs;
997 struct sockaddr_in *psin;
998 int omode, add;
999
1000 if (optlen != sizeof(struct group_source_req))
1001 goto e_inval;
1002 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
1003 err = -EFAULT;
1004 break;
1005 }
1006 if (greqs.gsr_group.ss_family != AF_INET ||
1007 greqs.gsr_source.ss_family != AF_INET) {
1008 err = -EADDRNOTAVAIL;
1009 break;
1010 }
1011 psin = (struct sockaddr_in *)&greqs.gsr_group;
1012 mreqs.imr_multiaddr = psin->sin_addr.s_addr;
1013 psin = (struct sockaddr_in *)&greqs.gsr_source;
1014 mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
1015 mreqs.imr_interface = 0; /* use index for mc_source */
1016
1017 if (optname == MCAST_BLOCK_SOURCE) {
1018 omode = MCAST_EXCLUDE;
1019 add = 1;
1020 } else if (optname == MCAST_UNBLOCK_SOURCE) {
1021 omode = MCAST_EXCLUDE;
1022 add = 0;
1023 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
1024 struct ip_mreqn mreq;
1025
1026 psin = (struct sockaddr_in *)&greqs.gsr_group;
1027 mreq.imr_multiaddr = psin->sin_addr;
1028 mreq.imr_address.s_addr = 0;
1029 mreq.imr_ifindex = greqs.gsr_interface;
1030 err = ip_mc_join_group(sk, &mreq);
1031 if (err && err != -EADDRINUSE)
1032 break;
1033 greqs.gsr_interface = mreq.imr_ifindex;
1034 omode = MCAST_INCLUDE;
1035 add = 1;
1036 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
1037 omode = MCAST_INCLUDE;
1038 add = 0;
1039 }
1040 err = ip_mc_source(add, omode, sk, &mreqs,
1041 greqs.gsr_interface);
1042 break;
1043 }
1044 case MCAST_MSFILTER:
1045 {
1046 struct sockaddr_in *psin;
1047 struct ip_msfilter *msf = NULL;
1048 struct group_filter *gsf = NULL;
1049 int msize, i, ifindex;
1050
1051 if (optlen < GROUP_FILTER_SIZE(0))
1052 goto e_inval;
1053 if (optlen > sysctl_optmem_max) {
1054 err = -ENOBUFS;
1055 break;
1056 }
1057 gsf = kmalloc(optlen, GFP_KERNEL);
1058 if (!gsf) {
1059 err = -ENOBUFS;
1060 break;
1061 }
1062 err = -EFAULT;
1063 if (copy_from_user(gsf, optval, optlen))
1064 goto mc_msf_out;
1065
1066 /* numsrc >= (4G-140)/128 overflow in 32 bits */
1067 if (gsf->gf_numsrc >= 0x1ffffff ||
1068 gsf->gf_numsrc > sysctl_igmp_max_msf) {
1069 err = -ENOBUFS;
1070 goto mc_msf_out;
1071 }
1072 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
1073 err = -EINVAL;
1074 goto mc_msf_out;
1075 }
1076 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
1077 msf = kmalloc(msize, GFP_KERNEL);
1078 if (!msf) {
1079 err = -ENOBUFS;
1080 goto mc_msf_out;
1081 }
1082 ifindex = gsf->gf_interface;
1083 psin = (struct sockaddr_in *)&gsf->gf_group;
1084 if (psin->sin_family != AF_INET) {
1085 err = -EADDRNOTAVAIL;
1086 goto mc_msf_out;
1087 }
1088 msf->imsf_multiaddr = psin->sin_addr.s_addr;
1089 msf->imsf_interface = 0;
1090 msf->imsf_fmode = gsf->gf_fmode;
1091 msf->imsf_numsrc = gsf->gf_numsrc;
1092 err = -EADDRNOTAVAIL;
1093 for (i = 0; i < gsf->gf_numsrc; ++i) {
1094 psin = (struct sockaddr_in *)&gsf->gf_slist[i];
1095
1096 if (psin->sin_family != AF_INET)
1097 goto mc_msf_out;
1098 msf->imsf_slist[i] = psin->sin_addr.s_addr;
1099 }
1100 kfree(gsf);
1101 gsf = NULL;
1102
1103 err = ip_mc_msfilter(sk, msf, ifindex);
1104 mc_msf_out:
1105 kfree(msf);
1106 kfree(gsf);
1107 break;
1108 }
1109 case IP_MULTICAST_ALL:
1110 if (optlen < 1)
1111 goto e_inval;
1112 if (val != 0 && val != 1)
1113 goto e_inval;
1114 inet->mc_all = val;
1115 break;
1116 case IP_ROUTER_ALERT:
1117 err = ip_ra_control(sk, val ? 1 : 0, NULL);
1118 break;
1119
1120 case IP_FREEBIND:
1121 if (optlen < 1)
1122 goto e_inval;
1123 inet->freebind = !!val;
1124 break;
1125
1126 case IP_IPSEC_POLICY:
1127 case IP_XFRM_POLICY:
1128 err = -EPERM;
1129 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1130 break;
1131 err = xfrm_user_policy(sk, optname, optval, optlen);
1132 break;
1133
1134 case IP_TRANSPARENT:
1135 if (!!val && !ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) &&
1136 !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
1137 err = -EPERM;
1138 break;
1139 }
1140 if (optlen < 1)
1141 goto e_inval;
1142 inet->transparent = !!val;
1143 break;
1144
1145 case IP_MINTTL:
1146 if (optlen < 1)
1147 goto e_inval;
1148 if (val < 0 || val > 255)
1149 goto e_inval;
1150 inet->min_ttl = val;
1151 break;
1152
1153 default:
1154 err = -ENOPROTOOPT;
1155 break;
1156 }
1157 release_sock(sk);
1158 if (needs_rtnl)
1159 rtnl_unlock();
1160 return err;
1161
1162 e_inval:
1163 release_sock(sk);
1164 if (needs_rtnl)
1165 rtnl_unlock();
1166 return -EINVAL;
1167 }
1168
1169 /**
1170 * ipv4_pktinfo_prepare - transfer some info from rtable to skb
1171 * @sk: socket
1172 * @skb: buffer
1173 *
1174 * To support IP_CMSG_PKTINFO option, we store rt_iif and specific
1175 * destination in skb->cb[] before dst drop.
1176 * This way, receiver doesn't make cache line misses to read rtable.
1177 */
1178 void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb)
1179 {
1180 struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb);
1181 bool prepare = (inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) ||
1182 ipv6_sk_rxinfo(sk);
1183
1184 if (prepare && skb_rtable(skb)) {
1185 pktinfo->ipi_ifindex = inet_iif(skb);
1186 pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb);
1187 } else {
1188 pktinfo->ipi_ifindex = 0;
1189 pktinfo->ipi_spec_dst.s_addr = 0;
1190 }
1191 skb_dst_drop(skb);
1192 }
1193
1194 int ip_setsockopt(struct sock *sk, int level,
1195 int optname, char __user *optval, unsigned int optlen)
1196 {
1197 int err;
1198
1199 if (level != SOL_IP)
1200 return -ENOPROTOOPT;
1201
1202 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1203 #ifdef CONFIG_NETFILTER
1204 /* we need to exclude all possible ENOPROTOOPTs except default case */
1205 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
1206 optname != IP_IPSEC_POLICY &&
1207 optname != IP_XFRM_POLICY &&
1208 !ip_mroute_opt(optname)) {
1209 lock_sock(sk);
1210 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
1211 release_sock(sk);
1212 }
1213 #endif
1214 return err;
1215 }
1216 EXPORT_SYMBOL(ip_setsockopt);
1217
1218 #ifdef CONFIG_COMPAT
1219 int compat_ip_setsockopt(struct sock *sk, int level, int optname,
1220 char __user *optval, unsigned int optlen)
1221 {
1222 int err;
1223
1224 if (level != SOL_IP)
1225 return -ENOPROTOOPT;
1226
1227 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
1228 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
1229 ip_setsockopt);
1230
1231 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1232 #ifdef CONFIG_NETFILTER
1233 /* we need to exclude all possible ENOPROTOOPTs except default case */
1234 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
1235 optname != IP_IPSEC_POLICY &&
1236 optname != IP_XFRM_POLICY &&
1237 !ip_mroute_opt(optname)) {
1238 lock_sock(sk);
1239 err = compat_nf_setsockopt(sk, PF_INET, optname,
1240 optval, optlen);
1241 release_sock(sk);
1242 }
1243 #endif
1244 return err;
1245 }
1246 EXPORT_SYMBOL(compat_ip_setsockopt);
1247 #endif
1248
1249 /*
1250 * Get the options. Note for future reference. The GET of IP options gets
1251 * the _received_ ones. The set sets the _sent_ ones.
1252 */
1253
1254 static int do_ip_getsockopt(struct sock *sk, int level, int optname,
1255 char __user *optval, int __user *optlen, unsigned int flags)
1256 {
1257 struct inet_sock *inet = inet_sk(sk);
1258 int val;
1259 int len;
1260
1261 if (level != SOL_IP)
1262 return -EOPNOTSUPP;
1263
1264 if (ip_mroute_opt(optname))
1265 return ip_mroute_getsockopt(sk, optname, optval, optlen);
1266
1267 if (get_user(len, optlen))
1268 return -EFAULT;
1269 if (len < 0)
1270 return -EINVAL;
1271
1272 lock_sock(sk);
1273
1274 switch (optname) {
1275 case IP_OPTIONS:
1276 {
1277 unsigned char optbuf[sizeof(struct ip_options)+40];
1278 struct ip_options *opt = (struct ip_options *)optbuf;
1279 struct ip_options_rcu *inet_opt;
1280
1281 inet_opt = rcu_dereference_protected(inet->inet_opt,
1282 sock_owned_by_user(sk));
1283 opt->optlen = 0;
1284 if (inet_opt)
1285 memcpy(optbuf, &inet_opt->opt,
1286 sizeof(struct ip_options) +
1287 inet_opt->opt.optlen);
1288 release_sock(sk);
1289
1290 if (opt->optlen == 0)
1291 return put_user(0, optlen);
1292
1293 ip_options_undo(opt);
1294
1295 len = min_t(unsigned int, len, opt->optlen);
1296 if (put_user(len, optlen))
1297 return -EFAULT;
1298 if (copy_to_user(optval, opt->__data, len))
1299 return -EFAULT;
1300 return 0;
1301 }
1302 case IP_PKTINFO:
1303 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
1304 break;
1305 case IP_RECVTTL:
1306 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
1307 break;
1308 case IP_RECVTOS:
1309 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
1310 break;
1311 case IP_RECVOPTS:
1312 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
1313 break;
1314 case IP_RETOPTS:
1315 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
1316 break;
1317 case IP_PASSSEC:
1318 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
1319 break;
1320 case IP_RECVORIGDSTADDR:
1321 val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0;
1322 break;
1323 case IP_CHECKSUM:
1324 val = (inet->cmsg_flags & IP_CMSG_CHECKSUM) != 0;
1325 break;
1326 case IP_TOS:
1327 val = inet->tos;
1328 break;
1329 case IP_TTL:
1330 val = (inet->uc_ttl == -1 ?
1331 sysctl_ip_default_ttl :
1332 inet->uc_ttl);
1333 break;
1334 case IP_HDRINCL:
1335 val = inet->hdrincl;
1336 break;
1337 case IP_NODEFRAG:
1338 val = inet->nodefrag;
1339 break;
1340 case IP_BIND_ADDRESS_NO_PORT:
1341 val = inet->bind_address_no_port;
1342 break;
1343 case IP_MTU_DISCOVER:
1344 val = inet->pmtudisc;
1345 break;
1346 case IP_MTU:
1347 {
1348 struct dst_entry *dst;
1349 val = 0;
1350 dst = sk_dst_get(sk);
1351 if (dst) {
1352 val = dst_mtu(dst);
1353 dst_release(dst);
1354 }
1355 if (!val) {
1356 release_sock(sk);
1357 return -ENOTCONN;
1358 }
1359 break;
1360 }
1361 case IP_RECVERR:
1362 val = inet->recverr;
1363 break;
1364 case IP_MULTICAST_TTL:
1365 val = inet->mc_ttl;
1366 break;
1367 case IP_MULTICAST_LOOP:
1368 val = inet->mc_loop;
1369 break;
1370 case IP_UNICAST_IF:
1371 val = (__force int)htonl((__u32) inet->uc_index);
1372 break;
1373 case IP_MULTICAST_IF:
1374 {
1375 struct in_addr addr;
1376 len = min_t(unsigned int, len, sizeof(struct in_addr));
1377 addr.s_addr = inet->mc_addr;
1378 release_sock(sk);
1379
1380 if (put_user(len, optlen))
1381 return -EFAULT;
1382 if (copy_to_user(optval, &addr, len))
1383 return -EFAULT;
1384 return 0;
1385 }
1386 case IP_MSFILTER:
1387 {
1388 struct ip_msfilter msf;
1389 int err;
1390
1391 if (len < IP_MSFILTER_SIZE(0)) {
1392 release_sock(sk);
1393 return -EINVAL;
1394 }
1395 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
1396 release_sock(sk);
1397 return -EFAULT;
1398 }
1399 err = ip_mc_msfget(sk, &msf,
1400 (struct ip_msfilter __user *)optval, optlen);
1401 release_sock(sk);
1402 return err;
1403 }
1404 case MCAST_MSFILTER:
1405 {
1406 struct group_filter gsf;
1407 int err;
1408
1409 if (len < GROUP_FILTER_SIZE(0)) {
1410 release_sock(sk);
1411 return -EINVAL;
1412 }
1413 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
1414 release_sock(sk);
1415 return -EFAULT;
1416 }
1417 err = ip_mc_gsfget(sk, &gsf,
1418 (struct group_filter __user *)optval,
1419 optlen);
1420 release_sock(sk);
1421 return err;
1422 }
1423 case IP_MULTICAST_ALL:
1424 val = inet->mc_all;
1425 break;
1426 case IP_PKTOPTIONS:
1427 {
1428 struct msghdr msg;
1429
1430 release_sock(sk);
1431
1432 if (sk->sk_type != SOCK_STREAM)
1433 return -ENOPROTOOPT;
1434
1435 msg.msg_control = (__force void *) optval;
1436 msg.msg_controllen = len;
1437 msg.msg_flags = flags;
1438
1439 if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
1440 struct in_pktinfo info;
1441
1442 info.ipi_addr.s_addr = inet->inet_rcv_saddr;
1443 info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr;
1444 info.ipi_ifindex = inet->mc_index;
1445 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
1446 }
1447 if (inet->cmsg_flags & IP_CMSG_TTL) {
1448 int hlim = inet->mc_ttl;
1449 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
1450 }
1451 if (inet->cmsg_flags & IP_CMSG_TOS) {
1452 int tos = inet->rcv_tos;
1453 put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos);
1454 }
1455 len -= msg.msg_controllen;
1456 return put_user(len, optlen);
1457 }
1458 case IP_FREEBIND:
1459 val = inet->freebind;
1460 break;
1461 case IP_TRANSPARENT:
1462 val = inet->transparent;
1463 break;
1464 case IP_MINTTL:
1465 val = inet->min_ttl;
1466 break;
1467 default:
1468 release_sock(sk);
1469 return -ENOPROTOOPT;
1470 }
1471 release_sock(sk);
1472
1473 if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) {
1474 unsigned char ucval = (unsigned char)val;
1475 len = 1;
1476 if (put_user(len, optlen))
1477 return -EFAULT;
1478 if (copy_to_user(optval, &ucval, 1))
1479 return -EFAULT;
1480 } else {
1481 len = min_t(unsigned int, sizeof(int), len);
1482 if (put_user(len, optlen))
1483 return -EFAULT;
1484 if (copy_to_user(optval, &val, len))
1485 return -EFAULT;
1486 }
1487 return 0;
1488 }
1489
1490 int ip_getsockopt(struct sock *sk, int level,
1491 int optname, char __user *optval, int __user *optlen)
1492 {
1493 int err;
1494
1495 err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0);
1496 #ifdef CONFIG_NETFILTER
1497 /* we need to exclude all possible ENOPROTOOPTs except default case */
1498 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1499 !ip_mroute_opt(optname)) {
1500 int len;
1501
1502 if (get_user(len, optlen))
1503 return -EFAULT;
1504
1505 lock_sock(sk);
1506 err = nf_getsockopt(sk, PF_INET, optname, optval,
1507 &len);
1508 release_sock(sk);
1509 if (err >= 0)
1510 err = put_user(len, optlen);
1511 return err;
1512 }
1513 #endif
1514 return err;
1515 }
1516 EXPORT_SYMBOL(ip_getsockopt);
1517
1518 #ifdef CONFIG_COMPAT
1519 int compat_ip_getsockopt(struct sock *sk, int level, int optname,
1520 char __user *optval, int __user *optlen)
1521 {
1522 int err;
1523
1524 if (optname == MCAST_MSFILTER)
1525 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1526 ip_getsockopt);
1527
1528 err = do_ip_getsockopt(sk, level, optname, optval, optlen,
1529 MSG_CMSG_COMPAT);
1530
1531 #ifdef CONFIG_NETFILTER
1532 /* we need to exclude all possible ENOPROTOOPTs except default case */
1533 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1534 !ip_mroute_opt(optname)) {
1535 int len;
1536
1537 if (get_user(len, optlen))
1538 return -EFAULT;
1539
1540 lock_sock(sk);
1541 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
1542 release_sock(sk);
1543 if (err >= 0)
1544 err = put_user(len, optlen);
1545 return err;
1546 }
1547 #endif
1548 return err;
1549 }
1550 EXPORT_SYMBOL(compat_ip_getsockopt);
1551 #endif
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