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btrfs: fix sizeof format specifier in btrfs_check_super_valid()
[linux/fpc-iii.git] / net / ipv4 / ip_sockglue.c
blob8a89c738b7a3b43407293f521bd6d7e009ee7c80
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
60 static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb)
61 {
62 struct in_pktinfo info = *PKTINFO_SKB_CB(skb);
63
64 info.ipi_addr.s_addr = ip_hdr(skb)->daddr;
65
66 put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
67 }
68
69 static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb)
70 {
71 int ttl = ip_hdr(skb)->ttl;
72 put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl);
73 }
74
75 static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb)
76 {
77 put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos);
78 }
79
80 static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb)
81 {
82 if (IPCB(skb)->opt.optlen == 0)
83 return;
84
85 put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen,
86 ip_hdr(skb) + 1);
87 }
88
89
90 static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb)
91 {
92 unsigned char optbuf[sizeof(struct ip_options) + 40];
93 struct ip_options *opt = (struct ip_options *)optbuf;
94
95 if (IPCB(skb)->opt.optlen == 0)
96 return;
97
98 if (ip_options_echo(opt, skb)) {
99 msg->msg_flags |= MSG_CTRUNC;
100 return;
101 }
102 ip_options_undo(opt);
103
104 put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data);
105 }
106
107 static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
108 {
109 char *secdata;
110 u32 seclen, secid;
111 int err;
112
113 err = security_socket_getpeersec_dgram(NULL, skb, &secid);
114 if (err)
115 return;
116
117 err = security_secid_to_secctx(secid, &secdata, &seclen);
118 if (err)
119 return;
120
121 put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata);
122 security_release_secctx(secdata, seclen);
123 }
124
125 static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb)
126 {
127 struct sockaddr_in sin;
128 const struct iphdr *iph = ip_hdr(skb);
129 __be16 *ports = (__be16 *)skb_transport_header(skb);
130
131 if (skb_transport_offset(skb) + 4 > skb->len)
132 return;
133
134 /* All current transport protocols have the port numbers in the
135 * first four bytes of the transport header and this function is
136 * written with this assumption in mind.
137 */
138
139 sin.sin_family = AF_INET;
140 sin.sin_addr.s_addr = iph->daddr;
141 sin.sin_port = ports[1];
142 memset(sin.sin_zero, 0, sizeof(sin.sin_zero));
143
144 put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin);
145 }
146
147 void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
148 {
149 struct inet_sock *inet = inet_sk(skb->sk);
150 unsigned int flags = inet->cmsg_flags;
151
152 /* Ordered by supposed usage frequency */
153 if (flags & 1)
154 ip_cmsg_recv_pktinfo(msg, skb);
155 if ((flags >>= 1) == 0)
156 return;
157
158 if (flags & 1)
159 ip_cmsg_recv_ttl(msg, skb);
160 if ((flags >>= 1) == 0)
161 return;
162
163 if (flags & 1)
164 ip_cmsg_recv_tos(msg, skb);
165 if ((flags >>= 1) == 0)
166 return;
167
168 if (flags & 1)
169 ip_cmsg_recv_opts(msg, skb);
170 if ((flags >>= 1) == 0)
171 return;
172
173 if (flags & 1)
174 ip_cmsg_recv_retopts(msg, skb);
175 if ((flags >>= 1) == 0)
176 return;
177
178 if (flags & 1)
179 ip_cmsg_recv_security(msg, skb);
180
181 if ((flags >>= 1) == 0)
182 return;
183 if (flags & 1)
184 ip_cmsg_recv_dstaddr(msg, skb);
185
186 }
187 EXPORT_SYMBOL(ip_cmsg_recv);
188
189 int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc,
190 bool allow_ipv6)
191 {
192 int err, val;
193 struct cmsghdr *cmsg;
194
195 for_each_cmsghdr(cmsg, msg) {
196 if (!CMSG_OK(msg, cmsg))
197 return -EINVAL;
198 #if IS_ENABLED(CONFIG_IPV6)
199 if (allow_ipv6 &&
200 cmsg->cmsg_level == SOL_IPV6 &&
201 cmsg->cmsg_type == IPV6_PKTINFO) {
202 struct in6_pktinfo *src_info;
203
204 if (cmsg->cmsg_len < CMSG_LEN(sizeof(*src_info)))
205 return -EINVAL;
206 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
207 if (!ipv6_addr_v4mapped(&src_info->ipi6_addr))
208 return -EINVAL;
209 ipc->oif = src_info->ipi6_ifindex;
210 ipc->addr = src_info->ipi6_addr.s6_addr32[3];
211 continue;
212 }
213 #endif
214 if (cmsg->cmsg_level != SOL_IP)
215 continue;
216 switch (cmsg->cmsg_type) {
217 case IP_RETOPTS:
218 err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
219 err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg),
220 err < 40 ? err : 40);
221 if (err)
222 return err;
223 break;
224 case IP_PKTINFO:
225 {
226 struct in_pktinfo *info;
227 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
228 return -EINVAL;
229 info = (struct in_pktinfo *)CMSG_DATA(cmsg);
230 ipc->oif = info->ipi_ifindex;
231 ipc->addr = info->ipi_spec_dst.s_addr;
232 break;
233 }
234 case IP_TTL:
235 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
236 return -EINVAL;
237 val = *(int *)CMSG_DATA(cmsg);
238 if (val < 1 || val > 255)
239 return -EINVAL;
240 ipc->ttl = val;
241 break;
242 case IP_TOS:
243 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
244 return -EINVAL;
245 val = *(int *)CMSG_DATA(cmsg);
246 if (val < 0 || val > 255)
247 return -EINVAL;
248 ipc->tos = val;
249 ipc->priority = rt_tos2priority(ipc->tos);
250 break;
251
252 default:
253 return -EINVAL;
254 }
255 }
256 return 0;
257 }
258
259
260 /* Special input handler for packets caught by router alert option.
261 They are selected only by protocol field, and then processed likely
262 local ones; but only if someone wants them! Otherwise, router
263 not running rsvpd will kill RSVP.
264
265 It is user level problem, what it will make with them.
266 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
267 but receiver should be enough clever f.e. to forward mtrace requests,
268 sent to multicast group to reach destination designated router.
269 */
270 struct ip_ra_chain __rcu *ip_ra_chain;
271 static DEFINE_SPINLOCK(ip_ra_lock);
272
273
274 static void ip_ra_destroy_rcu(struct rcu_head *head)
275 {
276 struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu);
277
278 sock_put(ra->saved_sk);
279 kfree(ra);
280 }
281
282 int ip_ra_control(struct sock *sk, unsigned char on,
283 void (*destructor)(struct sock *))
284 {
285 struct ip_ra_chain *ra, *new_ra;
286 struct ip_ra_chain __rcu **rap;
287
288 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW)
289 return -EINVAL;
290
291 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
292
293 spin_lock_bh(&ip_ra_lock);
294 for (rap = &ip_ra_chain;
295 (ra = rcu_dereference_protected(*rap,
296 lockdep_is_held(&ip_ra_lock))) != NULL;
297 rap = &ra->next) {
298 if (ra->sk == sk) {
299 if (on) {
300 spin_unlock_bh(&ip_ra_lock);
301 kfree(new_ra);
302 return -EADDRINUSE;
303 }
304 /* dont let ip_call_ra_chain() use sk again */
305 ra->sk = NULL;
306 RCU_INIT_POINTER(*rap, ra->next);
307 spin_unlock_bh(&ip_ra_lock);
308
309 if (ra->destructor)
310 ra->destructor(sk);
311 /*
312 * Delay sock_put(sk) and kfree(ra) after one rcu grace
313 * period. This guarantee ip_call_ra_chain() dont need
314 * to mess with socket refcounts.
315 */
316 ra->saved_sk = sk;
317 call_rcu(&ra->rcu, ip_ra_destroy_rcu);
318 return 0;
319 }
320 }
321 if (new_ra == NULL) {
322 spin_unlock_bh(&ip_ra_lock);
323 return -ENOBUFS;
324 }
325 new_ra->sk = sk;
326 new_ra->destructor = destructor;
327
328 RCU_INIT_POINTER(new_ra->next, ra);
329 rcu_assign_pointer(*rap, new_ra);
330 sock_hold(sk);
331 spin_unlock_bh(&ip_ra_lock);
332
333 return 0;
334 }
335
336 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
337 __be16 port, u32 info, u8 *payload)
338 {
339 struct sock_exterr_skb *serr;
340
341 skb = skb_clone(skb, GFP_ATOMIC);
342 if (!skb)
343 return;
344
345 serr = SKB_EXT_ERR(skb);
346 serr->ee.ee_errno = err;
347 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
348 serr->ee.ee_type = icmp_hdr(skb)->type;
349 serr->ee.ee_code = icmp_hdr(skb)->code;
350 serr->ee.ee_pad = 0;
351 serr->ee.ee_info = info;
352 serr->ee.ee_data = 0;
353 serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) -
354 skb_network_header(skb);
355 serr->port = port;
356
357 if (skb_pull(skb, payload - skb->data) != NULL) {
358 skb_reset_transport_header(skb);
359 if (sock_queue_err_skb(sk, skb) == 0)
360 return;
361 }
362 kfree_skb(skb);
363 }
364
365 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info)
366 {
367 struct inet_sock *inet = inet_sk(sk);
368 struct sock_exterr_skb *serr;
369 struct iphdr *iph;
370 struct sk_buff *skb;
371
372 if (!inet->recverr)
373 return;
374
375 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
376 if (!skb)
377 return;
378
379 skb_put(skb, sizeof(struct iphdr));
380 skb_reset_network_header(skb);
381 iph = ip_hdr(skb);
382 iph->daddr = daddr;
383
384 serr = SKB_EXT_ERR(skb);
385 serr->ee.ee_errno = err;
386 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
387 serr->ee.ee_type = 0;
388 serr->ee.ee_code = 0;
389 serr->ee.ee_pad = 0;
390 serr->ee.ee_info = info;
391 serr->ee.ee_data = 0;
392 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
393 serr->port = port;
394
395 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
396 skb_reset_transport_header(skb);
397
398 if (sock_queue_err_skb(sk, skb))
399 kfree_skb(skb);
400 }
401
402 static bool ipv4_pktinfo_prepare_errqueue(const struct sock *sk,
403 const struct sk_buff *skb,
404 int ee_origin)
405 {
406 struct in_pktinfo *info = PKTINFO_SKB_CB(skb);
407
408 if ((ee_origin != SO_EE_ORIGIN_TIMESTAMPING) ||
409 (!(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_CMSG)) ||
410 (!skb->dev))
411 return false;
412
413 info->ipi_spec_dst.s_addr = ip_hdr(skb)->saddr;
414 info->ipi_ifindex = skb->dev->ifindex;
415 return true;
416 }
417
418 /*
419 * Handle MSG_ERRQUEUE
420 */
421 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
422 {
423 struct sock_exterr_skb *serr;
424 struct sk_buff *skb;
425 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name);
426 struct {
427 struct sock_extended_err ee;
428 struct sockaddr_in offender;
429 } errhdr;
430 int err;
431 int copied;
432
433 WARN_ON_ONCE(sk->sk_family == AF_INET6);
434
435 err = -EAGAIN;
436 skb = sock_dequeue_err_skb(sk);
437 if (skb == NULL)
438 goto out;
439
440 copied = skb->len;
441 if (copied > len) {
442 msg->msg_flags |= MSG_TRUNC;
443 copied = len;
444 }
445 err = skb_copy_datagram_msg(skb, 0, msg, copied);
446 if (err)
447 goto out_free_skb;
448
449 sock_recv_timestamp(msg, sk, skb);
450
451 serr = SKB_EXT_ERR(skb);
452
453 if (sin) {
454 sin->sin_family = AF_INET;
455 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) +
456 serr->addr_offset);
457 sin->sin_port = serr->port;
458 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
459 *addr_len = sizeof(*sin);
460 }
461
462 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
463 sin = &errhdr.offender;
464 sin->sin_family = AF_UNSPEC;
465
466 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
467 ipv4_pktinfo_prepare_errqueue(sk, skb, serr->ee.ee_origin)) {
468 struct inet_sock *inet = inet_sk(sk);
469
470 sin->sin_family = AF_INET;
471 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
472 sin->sin_port = 0;
473 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
474 if (inet->cmsg_flags)
475 ip_cmsg_recv(msg, skb);
476 }
477
478 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
479
480 /* Now we could try to dump offended packet options */
481
482 msg->msg_flags |= MSG_ERRQUEUE;
483 err = copied;
484
485 out_free_skb:
486 kfree_skb(skb);
487 out:
488 return err;
489 }
490
491
492 /*
493 * Socket option code for IP. This is the end of the line after any
494 * TCP,UDP etc options on an IP socket.
495 */
496
497 static int do_ip_setsockopt(struct sock *sk, int level,
498 int optname, char __user *optval, unsigned int optlen)
499 {
500 struct inet_sock *inet = inet_sk(sk);
501 int val = 0, err;
502
503 switch (optname) {
504 case IP_PKTINFO:
505 case IP_RECVTTL:
506 case IP_RECVOPTS:
507 case IP_RECVTOS:
508 case IP_RETOPTS:
509 case IP_TOS:
510 case IP_TTL:
511 case IP_HDRINCL:
512 case IP_MTU_DISCOVER:
513 case IP_RECVERR:
514 case IP_ROUTER_ALERT:
515 case IP_FREEBIND:
516 case IP_PASSSEC:
517 case IP_TRANSPARENT:
518 case IP_MINTTL:
519 case IP_NODEFRAG:
520 case IP_UNICAST_IF:
521 case IP_MULTICAST_TTL:
522 case IP_MULTICAST_ALL:
523 case IP_MULTICAST_LOOP:
524 case IP_RECVORIGDSTADDR:
525 if (optlen >= sizeof(int)) {
526 if (get_user(val, (int __user *) optval))
527 return -EFAULT;
528 } else if (optlen >= sizeof(char)) {
529 unsigned char ucval;
530
531 if (get_user(ucval, (unsigned char __user *) optval))
532 return -EFAULT;
533 val = (int) ucval;
534 }
535 }
536
537 /* If optlen==0, it is equivalent to val == 0 */
538
539 if (ip_mroute_opt(optname))
540 return ip_mroute_setsockopt(sk, optname, optval, optlen);
541
542 err = 0;
543 lock_sock(sk);
544
545 switch (optname) {
546 case IP_OPTIONS:
547 {
548 struct ip_options_rcu *old, *opt = NULL;
549
550 if (optlen > 40)
551 goto e_inval;
552 err = ip_options_get_from_user(sock_net(sk), &opt,
553 optval, optlen);
554 if (err)
555 break;
556 old = rcu_dereference_protected(inet->inet_opt,
557 sock_owned_by_user(sk));
558 if (inet->is_icsk) {
559 struct inet_connection_sock *icsk = inet_csk(sk);
560 #if IS_ENABLED(CONFIG_IPV6)
561 if (sk->sk_family == PF_INET ||
562 (!((1 << sk->sk_state) &
563 (TCPF_LISTEN | TCPF_CLOSE)) &&
564 inet->inet_daddr != LOOPBACK4_IPV6)) {
565 #endif
566 if (old)
567 icsk->icsk_ext_hdr_len -= old->opt.optlen;
568 if (opt)
569 icsk->icsk_ext_hdr_len += opt->opt.optlen;
570 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
571 #if IS_ENABLED(CONFIG_IPV6)
572 }
573 #endif
574 }
575 rcu_assign_pointer(inet->inet_opt, opt);
576 if (old)
577 kfree_rcu(old, rcu);
578 break;
579 }
580 case IP_PKTINFO:
581 if (val)
582 inet->cmsg_flags |= IP_CMSG_PKTINFO;
583 else
584 inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
585 break;
586 case IP_RECVTTL:
587 if (val)
588 inet->cmsg_flags |= IP_CMSG_TTL;
589 else
590 inet->cmsg_flags &= ~IP_CMSG_TTL;
591 break;
592 case IP_RECVTOS:
593 if (val)
594 inet->cmsg_flags |= IP_CMSG_TOS;
595 else
596 inet->cmsg_flags &= ~IP_CMSG_TOS;
597 break;
598 case IP_RECVOPTS:
599 if (val)
600 inet->cmsg_flags |= IP_CMSG_RECVOPTS;
601 else
602 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
603 break;
604 case IP_RETOPTS:
605 if (val)
606 inet->cmsg_flags |= IP_CMSG_RETOPTS;
607 else
608 inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
609 break;
610 case IP_PASSSEC:
611 if (val)
612 inet->cmsg_flags |= IP_CMSG_PASSSEC;
613 else
614 inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
615 break;
616 case IP_RECVORIGDSTADDR:
617 if (val)
618 inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR;
619 else
620 inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR;
621 break;
622 case IP_TOS: /* This sets both TOS and Precedence */
623 if (sk->sk_type == SOCK_STREAM) {
624 val &= ~INET_ECN_MASK;
625 val |= inet->tos & INET_ECN_MASK;
626 }
627 if (inet->tos != val) {
628 inet->tos = val;
629 sk->sk_priority = rt_tos2priority(val);
630 sk_dst_reset(sk);
631 }
632 break;
633 case IP_TTL:
634 if (optlen < 1)
635 goto e_inval;
636 if (val != -1 && (val < 1 || val > 255))
637 goto e_inval;
638 inet->uc_ttl = val;
639 break;
640 case IP_HDRINCL:
641 if (sk->sk_type != SOCK_RAW) {
642 err = -ENOPROTOOPT;
643 break;
644 }
645 inet->hdrincl = val ? 1 : 0;
646 break;
647 case IP_NODEFRAG:
648 if (sk->sk_type != SOCK_RAW) {
649 err = -ENOPROTOOPT;
650 break;
651 }
652 inet->nodefrag = val ? 1 : 0;
653 break;
654 case IP_MTU_DISCOVER:
655 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_OMIT)
656 goto e_inval;
657 inet->pmtudisc = val;
658 break;
659 case IP_RECVERR:
660 inet->recverr = !!val;
661 if (!val)
662 skb_queue_purge(&sk->sk_error_queue);
663 break;
664 case IP_MULTICAST_TTL:
665 if (sk->sk_type == SOCK_STREAM)
666 goto e_inval;
667 if (optlen < 1)
668 goto e_inval;
669 if (val == -1)
670 val = 1;
671 if (val < 0 || val > 255)
672 goto e_inval;
673 inet->mc_ttl = val;
674 break;
675 case IP_MULTICAST_LOOP:
676 if (optlen < 1)
677 goto e_inval;
678 inet->mc_loop = !!val;
679 break;
680 case IP_UNICAST_IF:
681 {
682 struct net_device *dev = NULL;
683 int ifindex;
684
685 if (optlen != sizeof(int))
686 goto e_inval;
687
688 ifindex = (__force int)ntohl((__force __be32)val);
689 if (ifindex == 0) {
690 inet->uc_index = 0;
691 err = 0;
692 break;
693 }
694
695 dev = dev_get_by_index(sock_net(sk), ifindex);
696 err = -EADDRNOTAVAIL;
697 if (!dev)
698 break;
699 dev_put(dev);
700
701 err = -EINVAL;
702 if (sk->sk_bound_dev_if)
703 break;
704
705 inet->uc_index = ifindex;
706 err = 0;
707 break;
708 }
709 case IP_MULTICAST_IF:
710 {
711 struct ip_mreqn mreq;
712 struct net_device *dev = NULL;
713
714 if (sk->sk_type == SOCK_STREAM)
715 goto e_inval;
716 /*
717 * Check the arguments are allowable
718 */
719
720 if (optlen < sizeof(struct in_addr))
721 goto e_inval;
722
723 err = -EFAULT;
724 if (optlen >= sizeof(struct ip_mreqn)) {
725 if (copy_from_user(&mreq, optval, sizeof(mreq)))
726 break;
727 } else {
728 memset(&mreq, 0, sizeof(mreq));
729 if (optlen >= sizeof(struct ip_mreq)) {
730 if (copy_from_user(&mreq, optval,
731 sizeof(struct ip_mreq)))
732 break;
733 } else if (optlen >= sizeof(struct in_addr)) {
734 if (copy_from_user(&mreq.imr_address, optval,
735 sizeof(struct in_addr)))
736 break;
737 }
738 }
739
740 if (!mreq.imr_ifindex) {
741 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) {
742 inet->mc_index = 0;
743 inet->mc_addr = 0;
744 err = 0;
745 break;
746 }
747 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr);
748 if (dev)
749 mreq.imr_ifindex = dev->ifindex;
750 } else
751 dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex);
752
753
754 err = -EADDRNOTAVAIL;
755 if (!dev)
756 break;
757 dev_put(dev);
758
759 err = -EINVAL;
760 if (sk->sk_bound_dev_if &&
761 mreq.imr_ifindex != sk->sk_bound_dev_if)
762 break;
763
764 inet->mc_index = mreq.imr_ifindex;
765 inet->mc_addr = mreq.imr_address.s_addr;
766 err = 0;
767 break;
768 }
769
770 case IP_ADD_MEMBERSHIP:
771 case IP_DROP_MEMBERSHIP:
772 {
773 struct ip_mreqn mreq;
774
775 err = -EPROTO;
776 if (inet_sk(sk)->is_icsk)
777 break;
778
779 if (optlen < sizeof(struct ip_mreq))
780 goto e_inval;
781 err = -EFAULT;
782 if (optlen >= sizeof(struct ip_mreqn)) {
783 if (copy_from_user(&mreq, optval, sizeof(mreq)))
784 break;
785 } else {
786 memset(&mreq, 0, sizeof(mreq));
787 if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq)))
788 break;
789 }
790
791 if (optname == IP_ADD_MEMBERSHIP)
792 err = ip_mc_join_group(sk, &mreq);
793 else
794 err = ip_mc_leave_group(sk, &mreq);
795 break;
796 }
797 case IP_MSFILTER:
798 {
799 struct ip_msfilter *msf;
800
801 if (optlen < IP_MSFILTER_SIZE(0))
802 goto e_inval;
803 if (optlen > sysctl_optmem_max) {
804 err = -ENOBUFS;
805 break;
806 }
807 msf = kmalloc(optlen, GFP_KERNEL);
808 if (!msf) {
809 err = -ENOBUFS;
810 break;
811 }
812 err = -EFAULT;
813 if (copy_from_user(msf, optval, optlen)) {
814 kfree(msf);
815 break;
816 }
817 /* numsrc >= (1G-4) overflow in 32 bits */
818 if (msf->imsf_numsrc >= 0x3ffffffcU ||
819 msf->imsf_numsrc > sysctl_igmp_max_msf) {
820 kfree(msf);
821 err = -ENOBUFS;
822 break;
823 }
824 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
825 kfree(msf);
826 err = -EINVAL;
827 break;
828 }
829 err = ip_mc_msfilter(sk, msf, 0);
830 kfree(msf);
831 break;
832 }
833 case IP_BLOCK_SOURCE:
834 case IP_UNBLOCK_SOURCE:
835 case IP_ADD_SOURCE_MEMBERSHIP:
836 case IP_DROP_SOURCE_MEMBERSHIP:
837 {
838 struct ip_mreq_source mreqs;
839 int omode, add;
840
841 if (optlen != sizeof(struct ip_mreq_source))
842 goto e_inval;
843 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
844 err = -EFAULT;
845 break;
846 }
847 if (optname == IP_BLOCK_SOURCE) {
848 omode = MCAST_EXCLUDE;
849 add = 1;
850 } else if (optname == IP_UNBLOCK_SOURCE) {
851 omode = MCAST_EXCLUDE;
852 add = 0;
853 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
854 struct ip_mreqn mreq;
855
856 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
857 mreq.imr_address.s_addr = mreqs.imr_interface;
858 mreq.imr_ifindex = 0;
859 err = ip_mc_join_group(sk, &mreq);
860 if (err && err != -EADDRINUSE)
861 break;
862 omode = MCAST_INCLUDE;
863 add = 1;
864 } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
865 omode = MCAST_INCLUDE;
866 add = 0;
867 }
868 err = ip_mc_source(add, omode, sk, &mreqs, 0);
869 break;
870 }
871 case MCAST_JOIN_GROUP:
872 case MCAST_LEAVE_GROUP:
873 {
874 struct group_req greq;
875 struct sockaddr_in *psin;
876 struct ip_mreqn mreq;
877
878 if (optlen < sizeof(struct group_req))
879 goto e_inval;
880 err = -EFAULT;
881 if (copy_from_user(&greq, optval, sizeof(greq)))
882 break;
883 psin = (struct sockaddr_in *)&greq.gr_group;
884 if (psin->sin_family != AF_INET)
885 goto e_inval;
886 memset(&mreq, 0, sizeof(mreq));
887 mreq.imr_multiaddr = psin->sin_addr;
888 mreq.imr_ifindex = greq.gr_interface;
889
890 if (optname == MCAST_JOIN_GROUP)
891 err = ip_mc_join_group(sk, &mreq);
892 else
893 err = ip_mc_leave_group(sk, &mreq);
894 break;
895 }
896 case MCAST_JOIN_SOURCE_GROUP:
897 case MCAST_LEAVE_SOURCE_GROUP:
898 case MCAST_BLOCK_SOURCE:
899 case MCAST_UNBLOCK_SOURCE:
900 {
901 struct group_source_req greqs;
902 struct ip_mreq_source mreqs;
903 struct sockaddr_in *psin;
904 int omode, add;
905
906 if (optlen != sizeof(struct group_source_req))
907 goto e_inval;
908 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
909 err = -EFAULT;
910 break;
911 }
912 if (greqs.gsr_group.ss_family != AF_INET ||
913 greqs.gsr_source.ss_family != AF_INET) {
914 err = -EADDRNOTAVAIL;
915 break;
916 }
917 psin = (struct sockaddr_in *)&greqs.gsr_group;
918 mreqs.imr_multiaddr = psin->sin_addr.s_addr;
919 psin = (struct sockaddr_in *)&greqs.gsr_source;
920 mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
921 mreqs.imr_interface = 0; /* use index for mc_source */
922
923 if (optname == MCAST_BLOCK_SOURCE) {
924 omode = MCAST_EXCLUDE;
925 add = 1;
926 } else if (optname == MCAST_UNBLOCK_SOURCE) {
927 omode = MCAST_EXCLUDE;
928 add = 0;
929 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
930 struct ip_mreqn mreq;
931
932 psin = (struct sockaddr_in *)&greqs.gsr_group;
933 mreq.imr_multiaddr = psin->sin_addr;
934 mreq.imr_address.s_addr = 0;
935 mreq.imr_ifindex = greqs.gsr_interface;
936 err = ip_mc_join_group(sk, &mreq);
937 if (err && err != -EADDRINUSE)
938 break;
939 greqs.gsr_interface = mreq.imr_ifindex;
940 omode = MCAST_INCLUDE;
941 add = 1;
942 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
943 omode = MCAST_INCLUDE;
944 add = 0;
945 }
946 err = ip_mc_source(add, omode, sk, &mreqs,
947 greqs.gsr_interface);
948 break;
949 }
950 case MCAST_MSFILTER:
951 {
952 struct sockaddr_in *psin;
953 struct ip_msfilter *msf = NULL;
954 struct group_filter *gsf = NULL;
955 int msize, i, ifindex;
956
957 if (optlen < GROUP_FILTER_SIZE(0))
958 goto e_inval;
959 if (optlen > sysctl_optmem_max) {
960 err = -ENOBUFS;
961 break;
962 }
963 gsf = kmalloc(optlen, GFP_KERNEL);
964 if (!gsf) {
965 err = -ENOBUFS;
966 break;
967 }
968 err = -EFAULT;
969 if (copy_from_user(gsf, optval, optlen))
970 goto mc_msf_out;
971
972 /* numsrc >= (4G-140)/128 overflow in 32 bits */
973 if (gsf->gf_numsrc >= 0x1ffffff ||
974 gsf->gf_numsrc > sysctl_igmp_max_msf) {
975 err = -ENOBUFS;
976 goto mc_msf_out;
977 }
978 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
979 err = -EINVAL;
980 goto mc_msf_out;
981 }
982 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
983 msf = kmalloc(msize, GFP_KERNEL);
984 if (!msf) {
985 err = -ENOBUFS;
986 goto mc_msf_out;
987 }
988 ifindex = gsf->gf_interface;
989 psin = (struct sockaddr_in *)&gsf->gf_group;
990 if (psin->sin_family != AF_INET) {
991 err = -EADDRNOTAVAIL;
992 goto mc_msf_out;
993 }
994 msf->imsf_multiaddr = psin->sin_addr.s_addr;
995 msf->imsf_interface = 0;
996 msf->imsf_fmode = gsf->gf_fmode;
997 msf->imsf_numsrc = gsf->gf_numsrc;
998 err = -EADDRNOTAVAIL;
999 for (i = 0; i < gsf->gf_numsrc; ++i) {
1000 psin = (struct sockaddr_in *)&gsf->gf_slist[i];
1001
1002 if (psin->sin_family != AF_INET)
1003 goto mc_msf_out;
1004 msf->imsf_slist[i] = psin->sin_addr.s_addr;
1005 }
1006 kfree(gsf);
1007 gsf = NULL;
1008
1009 err = ip_mc_msfilter(sk, msf, ifindex);
1010 mc_msf_out:
1011 kfree(msf);
1012 kfree(gsf);
1013 break;
1014 }
1015 case IP_MULTICAST_ALL:
1016 if (optlen < 1)
1017 goto e_inval;
1018 if (val != 0 && val != 1)
1019 goto e_inval;
1020 inet->mc_all = val;
1021 break;
1022 case IP_ROUTER_ALERT:
1023 err = ip_ra_control(sk, val ? 1 : 0, NULL);
1024 break;
1025
1026 case IP_FREEBIND:
1027 if (optlen < 1)
1028 goto e_inval;
1029 inet->freebind = !!val;
1030 break;
1031
1032 case IP_IPSEC_POLICY:
1033 case IP_XFRM_POLICY:
1034 err = -EPERM;
1035 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1036 break;
1037 err = xfrm_user_policy(sk, optname, optval, optlen);
1038 break;
1039
1040 case IP_TRANSPARENT:
1041 if (!!val && !ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) &&
1042 !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
1043 err = -EPERM;
1044 break;
1045 }
1046 if (optlen < 1)
1047 goto e_inval;
1048 inet->transparent = !!val;
1049 break;
1050
1051 case IP_MINTTL:
1052 if (optlen < 1)
1053 goto e_inval;
1054 if (val < 0 || val > 255)
1055 goto e_inval;
1056 inet->min_ttl = val;
1057 break;
1058
1059 default:
1060 err = -ENOPROTOOPT;
1061 break;
1062 }
1063 release_sock(sk);
1064 return err;
1065
1066 e_inval:
1067 release_sock(sk);
1068 return -EINVAL;
1069 }
1070
1071 /**
1072 * ipv4_pktinfo_prepare - transfer some info from rtable to skb
1073 * @sk: socket
1074 * @skb: buffer
1075 *
1076 * To support IP_CMSG_PKTINFO option, we store rt_iif and specific
1077 * destination in skb->cb[] before dst drop.
1078 * This way, receiver doesn't make cache line misses to read rtable.
1079 */
1080 void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb)
1081 {
1082 struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb);
1083 bool prepare = (inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) ||
1084 ipv6_sk_rxinfo(sk);
1085
1086 if (prepare && skb_rtable(skb)) {
1087 pktinfo->ipi_ifindex = inet_iif(skb);
1088 pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb);
1089 } else {
1090 pktinfo->ipi_ifindex = 0;
1091 pktinfo->ipi_spec_dst.s_addr = 0;
1092 }
1093 skb_dst_drop(skb);
1094 }
1095
1096 int ip_setsockopt(struct sock *sk, int level,
1097 int optname, char __user *optval, unsigned int optlen)
1098 {
1099 int err;
1100
1101 if (level != SOL_IP)
1102 return -ENOPROTOOPT;
1103
1104 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1105 #ifdef CONFIG_NETFILTER
1106 /* we need to exclude all possible ENOPROTOOPTs except default case */
1107 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
1108 optname != IP_IPSEC_POLICY &&
1109 optname != IP_XFRM_POLICY &&
1110 !ip_mroute_opt(optname)) {
1111 lock_sock(sk);
1112 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
1113 release_sock(sk);
1114 }
1115 #endif
1116 return err;
1117 }
1118 EXPORT_SYMBOL(ip_setsockopt);
1119
1120 #ifdef CONFIG_COMPAT
1121 int compat_ip_setsockopt(struct sock *sk, int level, int optname,
1122 char __user *optval, unsigned int optlen)
1123 {
1124 int err;
1125
1126 if (level != SOL_IP)
1127 return -ENOPROTOOPT;
1128
1129 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
1130 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
1131 ip_setsockopt);
1132
1133 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1134 #ifdef CONFIG_NETFILTER
1135 /* we need to exclude all possible ENOPROTOOPTs except default case */
1136 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
1137 optname != IP_IPSEC_POLICY &&
1138 optname != IP_XFRM_POLICY &&
1139 !ip_mroute_opt(optname)) {
1140 lock_sock(sk);
1141 err = compat_nf_setsockopt(sk, PF_INET, optname,
1142 optval, optlen);
1143 release_sock(sk);
1144 }
1145 #endif
1146 return err;
1147 }
1148 EXPORT_SYMBOL(compat_ip_setsockopt);
1149 #endif
1150
1151 /*
1152 * Get the options. Note for future reference. The GET of IP options gets
1153 * the _received_ ones. The set sets the _sent_ ones.
1154 */
1155
1156 static int do_ip_getsockopt(struct sock *sk, int level, int optname,
1157 char __user *optval, int __user *optlen, unsigned int flags)
1158 {
1159 struct inet_sock *inet = inet_sk(sk);
1160 int val;
1161 int len;
1162
1163 if (level != SOL_IP)
1164 return -EOPNOTSUPP;
1165
1166 if (ip_mroute_opt(optname))
1167 return ip_mroute_getsockopt(sk, optname, optval, optlen);
1168
1169 if (get_user(len, optlen))
1170 return -EFAULT;
1171 if (len < 0)
1172 return -EINVAL;
1173
1174 lock_sock(sk);
1175
1176 switch (optname) {
1177 case IP_OPTIONS:
1178 {
1179 unsigned char optbuf[sizeof(struct ip_options)+40];
1180 struct ip_options *opt = (struct ip_options *)optbuf;
1181 struct ip_options_rcu *inet_opt;
1182
1183 inet_opt = rcu_dereference_protected(inet->inet_opt,
1184 sock_owned_by_user(sk));
1185 opt->optlen = 0;
1186 if (inet_opt)
1187 memcpy(optbuf, &inet_opt->opt,
1188 sizeof(struct ip_options) +
1189 inet_opt->opt.optlen);
1190 release_sock(sk);
1191
1192 if (opt->optlen == 0)
1193 return put_user(0, optlen);
1194
1195 ip_options_undo(opt);
1196
1197 len = min_t(unsigned int, len, opt->optlen);
1198 if (put_user(len, optlen))
1199 return -EFAULT;
1200 if (copy_to_user(optval, opt->__data, len))
1201 return -EFAULT;
1202 return 0;
1203 }
1204 case IP_PKTINFO:
1205 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
1206 break;
1207 case IP_RECVTTL:
1208 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
1209 break;
1210 case IP_RECVTOS:
1211 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
1212 break;
1213 case IP_RECVOPTS:
1214 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
1215 break;
1216 case IP_RETOPTS:
1217 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
1218 break;
1219 case IP_PASSSEC:
1220 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
1221 break;
1222 case IP_RECVORIGDSTADDR:
1223 val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0;
1224 break;
1225 case IP_TOS:
1226 val = inet->tos;
1227 break;
1228 case IP_TTL:
1229 val = (inet->uc_ttl == -1 ?
1230 sysctl_ip_default_ttl :
1231 inet->uc_ttl);
1232 break;
1233 case IP_HDRINCL:
1234 val = inet->hdrincl;
1235 break;
1236 case IP_NODEFRAG:
1237 val = inet->nodefrag;
1238 break;
1239 case IP_MTU_DISCOVER:
1240 val = inet->pmtudisc;
1241 break;
1242 case IP_MTU:
1243 {
1244 struct dst_entry *dst;
1245 val = 0;
1246 dst = sk_dst_get(sk);
1247 if (dst) {
1248 val = dst_mtu(dst);
1249 dst_release(dst);
1250 }
1251 if (!val) {
1252 release_sock(sk);
1253 return -ENOTCONN;
1254 }
1255 break;
1256 }
1257 case IP_RECVERR:
1258 val = inet->recverr;
1259 break;
1260 case IP_MULTICAST_TTL:
1261 val = inet->mc_ttl;
1262 break;
1263 case IP_MULTICAST_LOOP:
1264 val = inet->mc_loop;
1265 break;
1266 case IP_UNICAST_IF:
1267 val = (__force int)htonl((__u32) inet->uc_index);
1268 break;
1269 case IP_MULTICAST_IF:
1270 {
1271 struct in_addr addr;
1272 len = min_t(unsigned int, len, sizeof(struct in_addr));
1273 addr.s_addr = inet->mc_addr;
1274 release_sock(sk);
1275
1276 if (put_user(len, optlen))
1277 return -EFAULT;
1278 if (copy_to_user(optval, &addr, len))
1279 return -EFAULT;
1280 return 0;
1281 }
1282 case IP_MSFILTER:
1283 {
1284 struct ip_msfilter msf;
1285 int err;
1286
1287 if (len < IP_MSFILTER_SIZE(0)) {
1288 release_sock(sk);
1289 return -EINVAL;
1290 }
1291 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
1292 release_sock(sk);
1293 return -EFAULT;
1294 }
1295 err = ip_mc_msfget(sk, &msf,
1296 (struct ip_msfilter __user *)optval, optlen);
1297 release_sock(sk);
1298 return err;
1299 }
1300 case MCAST_MSFILTER:
1301 {
1302 struct group_filter gsf;
1303 int err;
1304
1305 if (len < GROUP_FILTER_SIZE(0)) {
1306 release_sock(sk);
1307 return -EINVAL;
1308 }
1309 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
1310 release_sock(sk);
1311 return -EFAULT;
1312 }
1313 err = ip_mc_gsfget(sk, &gsf,
1314 (struct group_filter __user *)optval,
1315 optlen);
1316 release_sock(sk);
1317 return err;
1318 }
1319 case IP_MULTICAST_ALL:
1320 val = inet->mc_all;
1321 break;
1322 case IP_PKTOPTIONS:
1323 {
1324 struct msghdr msg;
1325
1326 release_sock(sk);
1327
1328 if (sk->sk_type != SOCK_STREAM)
1329 return -ENOPROTOOPT;
1330
1331 msg.msg_control = (__force void *) optval;
1332 msg.msg_controllen = len;
1333 msg.msg_flags = flags;
1334
1335 if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
1336 struct in_pktinfo info;
1337
1338 info.ipi_addr.s_addr = inet->inet_rcv_saddr;
1339 info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr;
1340 info.ipi_ifindex = inet->mc_index;
1341 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
1342 }
1343 if (inet->cmsg_flags & IP_CMSG_TTL) {
1344 int hlim = inet->mc_ttl;
1345 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
1346 }
1347 if (inet->cmsg_flags & IP_CMSG_TOS) {
1348 int tos = inet->rcv_tos;
1349 put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos);
1350 }
1351 len -= msg.msg_controllen;
1352 return put_user(len, optlen);
1353 }
1354 case IP_FREEBIND:
1355 val = inet->freebind;
1356 break;
1357 case IP_TRANSPARENT:
1358 val = inet->transparent;
1359 break;
1360 case IP_MINTTL:
1361 val = inet->min_ttl;
1362 break;
1363 default:
1364 release_sock(sk);
1365 return -ENOPROTOOPT;
1366 }
1367 release_sock(sk);
1368
1369 if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) {
1370 unsigned char ucval = (unsigned char)val;
1371 len = 1;
1372 if (put_user(len, optlen))
1373 return -EFAULT;
1374 if (copy_to_user(optval, &ucval, 1))
1375 return -EFAULT;
1376 } else {
1377 len = min_t(unsigned int, sizeof(int), len);
1378 if (put_user(len, optlen))
1379 return -EFAULT;
1380 if (copy_to_user(optval, &val, len))
1381 return -EFAULT;
1382 }
1383 return 0;
1384 }
1385
1386 int ip_getsockopt(struct sock *sk, int level,
1387 int optname, char __user *optval, int __user *optlen)
1388 {
1389 int err;
1390
1391 err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0);
1392 #ifdef CONFIG_NETFILTER
1393 /* we need to exclude all possible ENOPROTOOPTs except default case */
1394 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1395 !ip_mroute_opt(optname)) {
1396 int len;
1397
1398 if (get_user(len, optlen))
1399 return -EFAULT;
1400
1401 lock_sock(sk);
1402 err = nf_getsockopt(sk, PF_INET, optname, optval,
1403 &len);
1404 release_sock(sk);
1405 if (err >= 0)
1406 err = put_user(len, optlen);
1407 return err;
1408 }
1409 #endif
1410 return err;
1411 }
1412 EXPORT_SYMBOL(ip_getsockopt);
1413
1414 #ifdef CONFIG_COMPAT
1415 int compat_ip_getsockopt(struct sock *sk, int level, int optname,
1416 char __user *optval, int __user *optlen)
1417 {
1418 int err;
1419
1420 if (optname == MCAST_MSFILTER)
1421 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1422 ip_getsockopt);
1423
1424 err = do_ip_getsockopt(sk, level, optname, optval, optlen,
1425 MSG_CMSG_COMPAT);
1426
1427 #ifdef CONFIG_NETFILTER
1428 /* we need to exclude all possible ENOPROTOOPTs except default case */
1429 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1430 !ip_mroute_opt(optname)) {
1431 int len;
1432
1433 if (get_user(len, optlen))
1434 return -EFAULT;
1435
1436 lock_sock(sk);
1437 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
1438 release_sock(sk);
1439 if (err >= 0)
1440 err = put_user(len, optlen);
1441 return err;
1442 }
1443 #endif
1444 return err;
1445 }
1446 EXPORT_SYMBOL(compat_ip_getsockopt);
1447 #endif
Linux with added FPC-III support