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net: ipv4/ip_sockglue.c cleanups
[mirror_ubuntu-bionic-kernel.git] / net / ipv4 / ip_sockglue.c
CommitLineData
1da177e4
LT		 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.
e905a9ed 7 *
1da177e4
LT		 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.
e905a9ed 13 * Alan Cox : Fixed a couple of oopses in Martin's
1da177e4
LT		 14 * TOS tweaks.
15 * Mike McLagan : Routing by source
16 */
17
1da177e4
LT		 18#include <linux/module.h>
19#include <linux/types.h>
20#include <linux/mm.h>
1da177e4
LT		 21#include <linux/skbuff.h>
22#include <linux/ip.h>
23#include <linux/icmp.h>
14c85021 24#include <linux/inetdevice.h>
1da177e4
LT		 25#include <linux/netdevice.h>
26#include <net/sock.h>
27#include <net/ip.h>
28#include <net/icmp.h>
d83d8461 29#include <net/tcp_states.h>
1da177e4
LT		 30#include <linux/udp.h>
31#include <linux/igmp.h>
32#include <linux/netfilter.h>
33#include <linux/route.h>
34#include <linux/mroute.h>
35#include <net/route.h>
36#include <net/xfrm.h>
dae50295 37#include <net/compat.h>
1da177e4
LT		 38#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
39#include <net/transp_v6.h>
40#endif
41
42#include <linux/errqueue.h>
43#include <asm/uaccess.h>
44
45#define IP_CMSG_PKTINFO 1
46#define IP_CMSG_TTL 2
47#define IP_CMSG_TOS 4
48#define IP_CMSG_RECVOPTS 8
49#define IP_CMSG_RETOPTS 16
2c7946a7 50#define IP_CMSG_PASSSEC 32
e8b2dfe9 51#define IP_CMSG_ORIGDSTADDR 64
1da177e4
LT		 52
53/*
54 * SOL_IP control messages.
55 */
56
57static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb)
58{
59 struct in_pktinfo info;
ee6b9673 60 struct rtable *rt = skb->rtable;
1da177e4 61
eddc9ec5 62 info.ipi_addr.s_addr = ip_hdr(skb)->daddr;
1da177e4
LT		 63 if (rt) {
64 info.ipi_ifindex = rt->rt_iif;
65 info.ipi_spec_dst.s_addr = rt->rt_spec_dst;
66 } else {
67 info.ipi_ifindex = 0;
68 info.ipi_spec_dst.s_addr = 0;
69 }
70
71 put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
72}
73
74static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb)
75{
eddc9ec5 76 int ttl = ip_hdr(skb)->ttl;
1da177e4
LT		 77 put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl);
78}
79
80static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb)
81{
eddc9ec5 82 put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos);
1da177e4
LT		 83}
84
85static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb)
86{
87 if (IPCB(skb)->opt.optlen == 0)
88 return;
89
eddc9ec5
ACM		 90 put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen,
91 ip_hdr(skb) + 1);
1da177e4
LT		 92}
93
94
95static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb)
96{
97 unsigned char optbuf[sizeof(struct ip_options) + 40];
09cb105e 98 struct ip_options * opt = (struct ip_options *)optbuf;
1da177e4
LT		 99
100 if (IPCB(skb)->opt.optlen == 0)
101 return;
102
103 if (ip_options_echo(opt, skb)) {
104 msg->msg_flags |= MSG_CTRUNC;
105 return;
106 }
107 ip_options_undo(opt);
108
109 put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data);
110}
111
2c7946a7
CZ		 112static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
113{
114 char *secdata;
dc49c1f9 115 u32 seclen, secid;
2c7946a7
CZ		 116 int err;
117
dc49c1f9
CZ		 118 err = security_socket_getpeersec_dgram(NULL, skb, &secid);
119 if (err)
120 return;
121
122 err = security_secid_to_secctx(secid, &secdata, &seclen);
2c7946a7
CZ		 123 if (err)
124 return;
125
126 put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata);
dc49c1f9 127 security_release_secctx(secdata, seclen);
2c7946a7
CZ		 128}
129
21d1a161 130static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb)
e8b2dfe9
BS		 131{
132 struct sockaddr_in sin;
133 struct iphdr *iph = ip_hdr(skb);
21d1a161 134 __be16 *ports = (__be16 *)skb_transport_header(skb);
e8b2dfe9
BS		 135
136 if (skb_transport_offset(skb) + 4 > skb->len)
137 return;
138
139 /* All current transport protocols have the port numbers in the
140 * first four bytes of the transport header and this function is
141 * written with this assumption in mind.
142 */
143
144 sin.sin_family = AF_INET;
145 sin.sin_addr.s_addr = iph->daddr;
146 sin.sin_port = ports[1];
147 memset(sin.sin_zero, 0, sizeof(sin.sin_zero));
148
149 put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin);
150}
1da177e4
LT		 151
152void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
153{
154 struct inet_sock *inet = inet_sk(skb->sk);
155 unsigned flags = inet->cmsg_flags;
156
157 /* Ordered by supposed usage frequency */
158 if (flags & 1)
159 ip_cmsg_recv_pktinfo(msg, skb);
4d52cfbe 160 if ((flags >>= 1) == 0)
1da177e4
LT		 161 return;
162
163 if (flags & 1)
164 ip_cmsg_recv_ttl(msg, skb);
4d52cfbe 165 if ((flags >>= 1) == 0)
1da177e4
LT		 166 return;
167
168 if (flags & 1)
169 ip_cmsg_recv_tos(msg, skb);
4d52cfbe 170 if ((flags >>= 1) == 0)
1da177e4
LT		 171 return;
172
173 if (flags & 1)
174 ip_cmsg_recv_opts(msg, skb);
4d52cfbe 175 if ((flags >>= 1) == 0)
1da177e4
LT		 176 return;
177
178 if (flags & 1)
179 ip_cmsg_recv_retopts(msg, skb);
4d52cfbe 180 if ((flags >>= 1) == 0)
2c7946a7
CZ		 181 return;
182
183 if (flags & 1)
184 ip_cmsg_recv_security(msg, skb);
e8b2dfe9 185
4d52cfbe 186 if ((flags >>= 1) == 0)
e8b2dfe9
BS		 187 return;
188 if (flags & 1)
189 ip_cmsg_recv_dstaddr(msg, skb);
190
1da177e4 191}
4d52cfbe 192EXPORT_SYMBOL(ip_cmsg_recv);
1da177e4 193
7a6adb92 194int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc)
1da177e4
LT		 195{
196 int err;
197 struct cmsghdr *cmsg;
198
199 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
200 if (!CMSG_OK(msg, cmsg))
201 return -EINVAL;
202 if (cmsg->cmsg_level != SOL_IP)
203 continue;
204 switch (cmsg->cmsg_type) {
205 case IP_RETOPTS:
206 err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
4d52cfbe
ED		 207 err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg),
208 err < 40 ? err : 40);
1da177e4
LT		 209 if (err)
210 return err;
211 break;
212 case IP_PKTINFO:
213 {
214 struct in_pktinfo *info;
215 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
216 return -EINVAL;
217 info = (struct in_pktinfo *)CMSG_DATA(cmsg);
218 ipc->oif = info->ipi_ifindex;
219 ipc->addr = info->ipi_spec_dst.s_addr;
220 break;
221 }
222 default:
223 return -EINVAL;
224 }
225 }
226 return 0;
227}
228
229
230/* Special input handler for packets caught by router alert option.
231 They are selected only by protocol field, and then processed likely
232 local ones; but only if someone wants them! Otherwise, router
233 not running rsvpd will kill RSVP.
234
235 It is user level problem, what it will make with them.
236 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
237 but receiver should be enough clever f.e. to forward mtrace requests,
238 sent to multicast group to reach destination designated router.
239 */
240struct ip_ra_chain *ip_ra_chain;
241DEFINE_RWLOCK(ip_ra_lock);
242
4d52cfbe
ED		 243int ip_ra_control(struct sock *sk, unsigned char on,
244 void (*destructor)(struct sock *))
1da177e4
LT		 245{
246 struct ip_ra_chain *ra, *new_ra, **rap;
247
248 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num == IPPROTO_RAW)
249 return -EINVAL;
250
251 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
252
253 write_lock_bh(&ip_ra_lock);
4d52cfbe 254 for (rap = &ip_ra_chain; (ra = *rap) != NULL; rap = &ra->next) {
1da177e4
LT		 255 if (ra->sk == sk) {
256 if (on) {
257 write_unlock_bh(&ip_ra_lock);
a51482bd 258 kfree(new_ra);
1da177e4
LT		 259 return -EADDRINUSE;
260 }
261 *rap = ra->next;
262 write_unlock_bh(&ip_ra_lock);
263
264 if (ra->destructor)
265 ra->destructor(sk);
266 sock_put(sk);
267 kfree(ra);
268 return 0;
269 }
270 }
271 if (new_ra == NULL) {
272 write_unlock_bh(&ip_ra_lock);
273 return -ENOBUFS;
274 }
275 new_ra->sk = sk;
276 new_ra->destructor = destructor;
277
278 new_ra->next = ra;
279 *rap = new_ra;
280 sock_hold(sk);
281 write_unlock_bh(&ip_ra_lock);
282
283 return 0;
284}
285
e905a9ed 286void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
35986b32 287 __be16 port, u32 info, u8 *payload)
1da177e4
LT		 288{
289 struct inet_sock *inet = inet_sk(sk);
290 struct sock_exterr_skb *serr;
291
292 if (!inet->recverr)
293 return;
294
295 skb = skb_clone(skb, GFP_ATOMIC);
296 if (!skb)
297 return;
298
e905a9ed 299 serr = SKB_EXT_ERR(skb);
1da177e4
LT		 300 serr->ee.ee_errno = err;
301 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
88c7664f
ACM		 302 serr->ee.ee_type = icmp_hdr(skb)->type;
303 serr->ee.ee_code = icmp_hdr(skb)->code;
1da177e4
LT		 304 serr->ee.ee_pad = 0;
305 serr->ee.ee_info = info;
306 serr->ee.ee_data = 0;
88c7664f 307 serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) -
d56f90a7 308 skb_network_header(skb);
1da177e4
LT		 309 serr->port = port;
310
bd82393c
ACM		 311 if (skb_pull(skb, payload - skb->data) != NULL) {
312 skb_reset_transport_header(skb);
313 if (sock_queue_err_skb(sk, skb) == 0)
314 return;
315 }
316 kfree_skb(skb);
1da177e4
LT		 317}
318
0579016e 319void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info)
1da177e4
LT		 320{
321 struct inet_sock *inet = inet_sk(sk);
322 struct sock_exterr_skb *serr;
323 struct iphdr *iph;
324 struct sk_buff *skb;
325
326 if (!inet->recverr)
327 return;
328
329 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
330 if (!skb)
331 return;
332
2ca9e6f2
ACM		 333 skb_put(skb, sizeof(struct iphdr));
334 skb_reset_network_header(skb);
eddc9ec5 335 iph = ip_hdr(skb);
1da177e4
LT		 336 iph->daddr = daddr;
337
e905a9ed 338 serr = SKB_EXT_ERR(skb);
1da177e4
LT		 339 serr->ee.ee_errno = err;
340 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
e905a9ed 341 serr->ee.ee_type = 0;
1da177e4
LT		 342 serr->ee.ee_code = 0;
343 serr->ee.ee_pad = 0;
344 serr->ee.ee_info = info;
345 serr->ee.ee_data = 0;
d56f90a7 346 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
1da177e4
LT		 347 serr->port = port;
348
27a884dc 349 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
bd82393c 350 skb_reset_transport_header(skb);
1da177e4
LT		 351
352 if (sock_queue_err_skb(sk, skb))
353 kfree_skb(skb);
354}
355
e905a9ed 356/*
1da177e4
LT		 357 * Handle MSG_ERRQUEUE
358 */
359int ip_recv_error(struct sock *sk, struct msghdr *msg, int len)
360{
361 struct sock_exterr_skb *serr;
362 struct sk_buff *skb, *skb2;
363 struct sockaddr_in *sin;
364 struct {
365 struct sock_extended_err ee;
366 struct sockaddr_in offender;
367 } errhdr;
368 int err;
369 int copied;
370
371 err = -EAGAIN;
372 skb = skb_dequeue(&sk->sk_error_queue);
373 if (skb == NULL)
374 goto out;
375
376 copied = skb->len;
377 if (copied > len) {
378 msg->msg_flags |= MSG_TRUNC;
379 copied = len;
380 }
381 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
382 if (err)
383 goto out_free_skb;
384
385 sock_recv_timestamp(msg, sk, skb);
386
387 serr = SKB_EXT_ERR(skb);
388
389 sin = (struct sockaddr_in *)msg->msg_name;
390 if (sin) {
391 sin->sin_family = AF_INET;
d56f90a7
ACM		 392 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) +
393 serr->addr_offset);
1da177e4
LT		 394 sin->sin_port = serr->port;
395 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
396 }
397
398 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
399 sin = &errhdr.offender;
400 sin->sin_family = AF_UNSPEC;
401 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) {
402 struct inet_sock *inet = inet_sk(sk);
403
404 sin->sin_family = AF_INET;
eddc9ec5 405 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
1da177e4
LT		 406 sin->sin_port = 0;
407 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
408 if (inet->cmsg_flags)
409 ip_cmsg_recv(msg, skb);
410 }
411
412 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
413
414 /* Now we could try to dump offended packet options */
415
416 msg->msg_flags |= MSG_ERRQUEUE;
417 err = copied;
418
419 /* Reset and regenerate socket error */
e0f9f858 420 spin_lock_bh(&sk->sk_error_queue.lock);
1da177e4 421 sk->sk_err = 0;
4d52cfbe
ED		 422 skb2 = skb_peek(&sk->sk_error_queue);
423 if (skb2 != NULL) {
1da177e4 424 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
e0f9f858 425 spin_unlock_bh(&sk->sk_error_queue.lock);
1da177e4
LT		 426 sk->sk_error_report(sk);
427 } else
e0f9f858 428 spin_unlock_bh(&sk->sk_error_queue.lock);
1da177e4 429
e905a9ed 430out_free_skb:
1da177e4
LT		 431 kfree_skb(skb);
432out:
433 return err;
434}
435
436
437/*
4d52cfbe
ED		 438 * Socket option code for IP. This is the end of the line after any
439 * TCP,UDP etc options on an IP socket.
1da177e4
LT		 440 */
441
3fdadf7d 442static int do_ip_setsockopt(struct sock *sk, int level,
132adf54 443 int optname, char __user *optval, int optlen)
1da177e4
LT		 444{
445 struct inet_sock *inet = inet_sk(sk);
09cb105e 446 int val = 0, err;
1da177e4 447
e905a9ed 448 if (((1<<optname) & ((1<<IP_PKTINFO) | (1<<IP_RECVTTL) |
132adf54
SH		 449 (1<<IP_RECVOPTS) | (1<<IP_RECVTOS) |
450 (1<<IP_RETOPTS) | (1<<IP_TOS) |
451 (1<<IP_TTL) | (1<<IP_HDRINCL) |
452 (1<<IP_MTU_DISCOVER) | (1<<IP_RECVERR) |
453 (1<<IP_ROUTER_ALERT) | (1<<IP_FREEBIND) |
f5715aea 454 (1<<IP_PASSSEC) | (1<<IP_TRANSPARENT))) ||
132adf54 455 optname == IP_MULTICAST_TTL ||
e8b2dfe9
BS		 456 optname == IP_MULTICAST_LOOP ||
457 optname == IP_RECVORIGDSTADDR) {
1da177e4
LT		 458 if (optlen >= sizeof(int)) {
459 if (get_user(val, (int __user *) optval))
460 return -EFAULT;
461 } else if (optlen >= sizeof(char)) {
462 unsigned char ucval;
463
464 if (get_user(ucval, (unsigned char __user *) optval))
465 return -EFAULT;
466 val = (int) ucval;
467 }
468 }
469
470 /* If optlen==0, it is equivalent to val == 0 */
471
6a9fb947 472 if (ip_mroute_opt(optname))
09cb105e 473 return ip_mroute_setsockopt(sk, optname, optval, optlen);
1da177e4
LT		 474
475 err = 0;
476 lock_sock(sk);
477
478 switch (optname) {
132adf54
SH		 479 case IP_OPTIONS:
480 {
4d52cfbe 481 struct ip_options *opt = NULL;
132adf54
SH		 482 if (optlen > 40 || optlen < 0)
483 goto e_inval;
3b1e0a65 484 err = ip_options_get_from_user(sock_net(sk), &opt,
cb84663e 485 optval, optlen);
132adf54
SH		 486 if (err)
487 break;
488 if (inet->is_icsk) {
489 struct inet_connection_sock *icsk = inet_csk(sk);
1da177e4 490#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
132adf54
SH		 491 if (sk->sk_family == PF_INET ||
492 (!((1 << sk->sk_state) &
493 (TCPF_LISTEN | TCPF_CLOSE)) &&
494 inet->daddr != LOOPBACK4_IPV6)) {
1da177e4 495#endif
132adf54
SH		 496 if (inet->opt)
497 icsk->icsk_ext_hdr_len -= inet->opt->optlen;
498 if (opt)
499 icsk->icsk_ext_hdr_len += opt->optlen;
500 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
1da177e4 501#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1da177e4 502 }
132adf54 503#endif
1da177e4 504 }
132adf54
SH		 505 opt = xchg(&inet->opt, opt);
506 kfree(opt);
507 break;
508 }
509 case IP_PKTINFO:
510 if (val)
511 inet->cmsg_flags |= IP_CMSG_PKTINFO;
512 else
513 inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
514 break;
515 case IP_RECVTTL:
516 if (val)
517 inet->cmsg_flags |= IP_CMSG_TTL;
518 else
519 inet->cmsg_flags &= ~IP_CMSG_TTL;
520 break;
521 case IP_RECVTOS:
522 if (val)
523 inet->cmsg_flags |= IP_CMSG_TOS;
524 else
525 inet->cmsg_flags &= ~IP_CMSG_TOS;
526 break;
527 case IP_RECVOPTS:
528 if (val)
529 inet->cmsg_flags |= IP_CMSG_RECVOPTS;
530 else
531 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
532 break;
533 case IP_RETOPTS:
534 if (val)
535 inet->cmsg_flags |= IP_CMSG_RETOPTS;
536 else
537 inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
538 break;
539 case IP_PASSSEC:
540 if (val)
541 inet->cmsg_flags |= IP_CMSG_PASSSEC;
542 else
543 inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
544 break;
e8b2dfe9
BS		 545 case IP_RECVORIGDSTADDR:
546 if (val)
547 inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR;
548 else
549 inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR;
550 break;
132adf54
SH		 551 case IP_TOS: /* This sets both TOS and Precedence */
552 if (sk->sk_type == SOCK_STREAM) {
553 val &= ~3;
554 val |= inet->tos & 3;
555 }
132adf54
SH		 556 if (inet->tos != val) {
557 inet->tos = val;
558 sk->sk_priority = rt_tos2priority(val);
559 sk_dst_reset(sk);
560 }
561 break;
562 case IP_TTL:
4d52cfbe 563 if (optlen < 1)
132adf54 564 goto e_inval;
4d52cfbe 565 if (val != -1 && (val < 0 || val > 255))
132adf54
SH		 566 goto e_inval;
567 inet->uc_ttl = val;
568 break;
569 case IP_HDRINCL:
570 if (sk->sk_type != SOCK_RAW) {
571 err = -ENOPROTOOPT;
2c7946a7 572 break;
132adf54
SH		 573 }
574 inet->hdrincl = val ? 1 : 0;
575 break;
576 case IP_MTU_DISCOVER:
4d52cfbe 577 if (val < 0 || val > 3)
132adf54
SH		 578 goto e_inval;
579 inet->pmtudisc = val;
580 break;
581 case IP_RECVERR:
582 inet->recverr = !!val;
583 if (!val)
584 skb_queue_purge(&sk->sk_error_queue);
585 break;
586 case IP_MULTICAST_TTL:
587 if (sk->sk_type == SOCK_STREAM)
588 goto e_inval;
4d52cfbe 589 if (optlen < 1)
132adf54 590 goto e_inval;
09cb105e 591 if (val == -1)
132adf54
SH		 592 val = 1;
593 if (val < 0 || val > 255)
594 goto e_inval;
595 inet->mc_ttl = val;
596 break;
597 case IP_MULTICAST_LOOP:
4d52cfbe 598 if (optlen < 1)
132adf54
SH		 599 goto e_inval;
600 inet->mc_loop = !!val;
601 break;
602 case IP_MULTICAST_IF:
603 {
604 struct ip_mreqn mreq;
605 struct net_device *dev = NULL;
606
607 if (sk->sk_type == SOCK_STREAM)
608 goto e_inval;
609 /*
610 * Check the arguments are allowable
611 */
612
613 err = -EFAULT;
614 if (optlen >= sizeof(struct ip_mreqn)) {
09cb105e 615 if (copy_from_user(&mreq, optval, sizeof(mreq)))
1da177e4 616 break;
132adf54
SH		 617 } else {
618 memset(&mreq, 0, sizeof(mreq));
619 if (optlen >= sizeof(struct in_addr) &&
4d52cfbe
ED		 620 copy_from_user(&mreq.imr_address, optval,
621 sizeof(struct in_addr)))
132adf54
SH		 622 break;
623 }
624
625 if (!mreq.imr_ifindex) {
e6f1cebf 626 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) {
132adf54
SH		 627 inet->mc_index = 0;
628 inet->mc_addr = 0;
629 err = 0;
1da177e4
LT		 630 break;
631 }
3b1e0a65 632 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr);
132adf54
SH		 633 if (dev) {
634 mreq.imr_ifindex = dev->ifindex;
635 dev_put(dev);
636 }
637 } else
3b1e0a65 638 dev = __dev_get_by_index(sock_net(sk), mreq.imr_ifindex);
1da177e4 639
1da177e4 640
132adf54
SH		 641 err = -EADDRNOTAVAIL;
642 if (!dev)
643 break;
644
645 err = -EINVAL;
646 if (sk->sk_bound_dev_if &&
647 mreq.imr_ifindex != sk->sk_bound_dev_if)
648 break;
1da177e4 649
132adf54
SH		 650 inet->mc_index = mreq.imr_ifindex;
651 inet->mc_addr = mreq.imr_address.s_addr;
652 err = 0;
653 break;
654 }
1da177e4 655
132adf54
SH		 656 case IP_ADD_MEMBERSHIP:
657 case IP_DROP_MEMBERSHIP:
658 {
659 struct ip_mreqn mreq;
1da177e4 660
a96fb49b
FL		 661 err = -EPROTO;
662 if (inet_sk(sk)->is_icsk)
663 break;
664
132adf54
SH		 665 if (optlen < sizeof(struct ip_mreq))
666 goto e_inval;
667 err = -EFAULT;
668 if (optlen >= sizeof(struct ip_mreqn)) {
09cb105e 669 if (copy_from_user(&mreq, optval, sizeof(mreq)))
1da177e4 670 break;
132adf54
SH		 671 } else {
672 memset(&mreq, 0, sizeof(mreq));
09cb105e 673 if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq)))
1da177e4 674 break;
132adf54 675 }
1da177e4 676
132adf54
SH		 677 if (optname == IP_ADD_MEMBERSHIP)
678 err = ip_mc_join_group(sk, &mreq);
679 else
680 err = ip_mc_leave_group(sk, &mreq);
681 break;
682 }
683 case IP_MSFILTER:
684 {
132adf54
SH		 685 struct ip_msfilter *msf;
686
687 if (optlen < IP_MSFILTER_SIZE(0))
688 goto e_inval;
689 if (optlen > sysctl_optmem_max) {
690 err = -ENOBUFS;
1da177e4
LT		 691 break;
692 }
132adf54 693 msf = kmalloc(optlen, GFP_KERNEL);
cfcabdcc 694 if (!msf) {
132adf54
SH		 695 err = -ENOBUFS;
696 break;
697 }
698 err = -EFAULT;
699 if (copy_from_user(msf, optval, optlen)) {
700 kfree(msf);
701 break;
702 }
703 /* numsrc >= (1G-4) overflow in 32 bits */
704 if (msf->imsf_numsrc >= 0x3ffffffcU ||
705 msf->imsf_numsrc > sysctl_igmp_max_msf) {
706 kfree(msf);
707 err = -ENOBUFS;
708 break;
709 }
710 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
711 kfree(msf);
712 err = -EINVAL;
713 break;
714 }
715 err = ip_mc_msfilter(sk, msf, 0);
716 kfree(msf);
717 break;
718 }
719 case IP_BLOCK_SOURCE:
720 case IP_UNBLOCK_SOURCE:
721 case IP_ADD_SOURCE_MEMBERSHIP:
722 case IP_DROP_SOURCE_MEMBERSHIP:
723 {
724 struct ip_mreq_source mreqs;
725 int omode, add;
1da177e4 726
132adf54
SH		 727 if (optlen != sizeof(struct ip_mreq_source))
728 goto e_inval;
729 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
1da177e4 730 err = -EFAULT;
1da177e4
LT		 731 break;
732 }
132adf54
SH		 733 if (optname == IP_BLOCK_SOURCE) {
734 omode = MCAST_EXCLUDE;
735 add = 1;
736 } else if (optname == IP_UNBLOCK_SOURCE) {
737 omode = MCAST_EXCLUDE;
738 add = 0;
739 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
740 struct ip_mreqn mreq;
1da177e4 741
132adf54
SH		 742 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
743 mreq.imr_address.s_addr = mreqs.imr_interface;
744 mreq.imr_ifindex = 0;
745 err = ip_mc_join_group(sk, &mreq);
746 if (err && err != -EADDRINUSE)
1da177e4 747 break;
132adf54
SH		 748 omode = MCAST_INCLUDE;
749 add = 1;
750 } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
751 omode = MCAST_INCLUDE;
752 add = 0;
753 }
754 err = ip_mc_source(add, omode, sk, &mreqs, 0);
755 break;
756 }
757 case MCAST_JOIN_GROUP:
758 case MCAST_LEAVE_GROUP:
759 {
760 struct group_req greq;
761 struct sockaddr_in *psin;
762 struct ip_mreqn mreq;
763
764 if (optlen < sizeof(struct group_req))
765 goto e_inval;
766 err = -EFAULT;
767 if (copy_from_user(&greq, optval, sizeof(greq)))
768 break;
769 psin = (struct sockaddr_in *)&greq.gr_group;
770 if (psin->sin_family != AF_INET)
771 goto e_inval;
772 memset(&mreq, 0, sizeof(mreq));
773 mreq.imr_multiaddr = psin->sin_addr;
774 mreq.imr_ifindex = greq.gr_interface;
775
776 if (optname == MCAST_JOIN_GROUP)
777 err = ip_mc_join_group(sk, &mreq);
778 else
779 err = ip_mc_leave_group(sk, &mreq);
780 break;
781 }
782 case MCAST_JOIN_SOURCE_GROUP:
783 case MCAST_LEAVE_SOURCE_GROUP:
784 case MCAST_BLOCK_SOURCE:
785 case MCAST_UNBLOCK_SOURCE:
786 {
787 struct group_source_req greqs;
788 struct ip_mreq_source mreqs;
789 struct sockaddr_in *psin;
790 int omode, add;
791
792 if (optlen != sizeof(struct group_source_req))
793 goto e_inval;
794 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
1da177e4 795 err = -EFAULT;
1da177e4
LT		 796 break;
797 }
132adf54
SH		 798 if (greqs.gsr_group.ss_family != AF_INET ||
799 greqs.gsr_source.ss_family != AF_INET) {
800 err = -EADDRNOTAVAIL;
1da177e4
LT		 801 break;
802 }
132adf54
SH		 803 psin = (struct sockaddr_in *)&greqs.gsr_group;
804 mreqs.imr_multiaddr = psin->sin_addr.s_addr;
805 psin = (struct sockaddr_in *)&greqs.gsr_source;
806 mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
807 mreqs.imr_interface = 0; /* use index for mc_source */
808
809 if (optname == MCAST_BLOCK_SOURCE) {
810 omode = MCAST_EXCLUDE;
811 add = 1;
812 } else if (optname == MCAST_UNBLOCK_SOURCE) {
813 omode = MCAST_EXCLUDE;
814 add = 0;
815 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
1da177e4
LT		 816 struct ip_mreqn mreq;
817
132adf54 818 psin = (struct sockaddr_in *)&greqs.gsr_group;
1da177e4 819 mreq.imr_multiaddr = psin->sin_addr;
132adf54
SH		 820 mreq.imr_address.s_addr = 0;
821 mreq.imr_ifindex = greqs.gsr_interface;
822 err = ip_mc_join_group(sk, &mreq);
823 if (err && err != -EADDRINUSE)
824 break;
825 greqs.gsr_interface = mreq.imr_ifindex;
826 omode = MCAST_INCLUDE;
827 add = 1;
828 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
829 omode = MCAST_INCLUDE;
830 add = 0;
831 }
832 err = ip_mc_source(add, omode, sk, &mreqs,
833 greqs.gsr_interface);
834 break;
835 }
836 case MCAST_MSFILTER:
837 {
132adf54
SH		 838 struct sockaddr_in *psin;
839 struct ip_msfilter *msf = NULL;
840 struct group_filter *gsf = NULL;
841 int msize, i, ifindex;
842
843 if (optlen < GROUP_FILTER_SIZE(0))
844 goto e_inval;
845 if (optlen > sysctl_optmem_max) {
846 err = -ENOBUFS;
1da177e4
LT		 847 break;
848 }
09cb105e 849 gsf = kmalloc(optlen, GFP_KERNEL);
cfcabdcc 850 if (!gsf) {
132adf54 851 err = -ENOBUFS;
1da177e4
LT		 852 break;
853 }
132adf54 854 err = -EFAULT;
4d52cfbe 855 if (copy_from_user(gsf, optval, optlen))
132adf54 856 goto mc_msf_out;
4d52cfbe 857
132adf54
SH		 858 /* numsrc >= (4G-140)/128 overflow in 32 bits */
859 if (gsf->gf_numsrc >= 0x1ffffff ||
860 gsf->gf_numsrc > sysctl_igmp_max_msf) {
861 err = -ENOBUFS;
862 goto mc_msf_out;
863 }
864 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
865 err = -EINVAL;
866 goto mc_msf_out;
867 }
868 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
09cb105e 869 msf = kmalloc(msize, GFP_KERNEL);
cfcabdcc 870 if (!msf) {
132adf54
SH		 871 err = -ENOBUFS;
872 goto mc_msf_out;
873 }
874 ifindex = gsf->gf_interface;
875 psin = (struct sockaddr_in *)&gsf->gf_group;
876 if (psin->sin_family != AF_INET) {
1da177e4 877 err = -EADDRNOTAVAIL;
132adf54 878 goto mc_msf_out;
1da177e4 879 }
132adf54
SH		 880 msf->imsf_multiaddr = psin->sin_addr.s_addr;
881 msf->imsf_interface = 0;
882 msf->imsf_fmode = gsf->gf_fmode;
883 msf->imsf_numsrc = gsf->gf_numsrc;
884 err = -EADDRNOTAVAIL;
4d52cfbe 885 for (i = 0; i < gsf->gf_numsrc; ++i) {
132adf54 886 psin = (struct sockaddr_in *)&gsf->gf_slist[i];
e905a9ed 887
132adf54
SH		 888 if (psin->sin_family != AF_INET)
889 goto mc_msf_out;
890 msf->imsf_slist[i] = psin->sin_addr.s_addr;
891 }
892 kfree(gsf);
893 gsf = NULL;
894
895 err = ip_mc_msfilter(sk, msf, ifindex);
4d52cfbe 896mc_msf_out:
132adf54
SH		 897 kfree(msf);
898 kfree(gsf);
899 break;
900 }
901 case IP_ROUTER_ALERT:
902 err = ip_ra_control(sk, val ? 1 : 0, NULL);
903 break;
904
905 case IP_FREEBIND:
4d52cfbe 906 if (optlen < 1)
132adf54
SH		 907 goto e_inval;
908 inet->freebind = !!val;
909 break;
910
911 case IP_IPSEC_POLICY:
912 case IP_XFRM_POLICY:
913 err = -EPERM;
914 if (!capable(CAP_NET_ADMIN))
1da177e4 915 break;
132adf54
SH		 916 err = xfrm_user_policy(sk, optname, optval, optlen);
917 break;
1da177e4 918
f5715aea
KK		 919 case IP_TRANSPARENT:
920 if (!capable(CAP_NET_ADMIN)) {
921 err = -EPERM;
922 break;
923 }
924 if (optlen < 1)
925 goto e_inval;
926 inet->transparent = !!val;
927 break;
928
132adf54
SH		 929 default:
930 err = -ENOPROTOOPT;
931 break;
1da177e4
LT		 932 }
933 release_sock(sk);
934 return err;
935
936e_inval:
937 release_sock(sk);
938 return -EINVAL;
939}
940
3fdadf7d
DM		 941int ip_setsockopt(struct sock *sk, int level,
942 int optname, char __user *optval, int optlen)
943{
944 int err;
945
946 if (level != SOL_IP)
947 return -ENOPROTOOPT;
948
949 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
950#ifdef CONFIG_NETFILTER
951 /* we need to exclude all possible ENOPROTOOPTs except default case */
952 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
6a9fb947
PE		 953 optname != IP_IPSEC_POLICY &&
954 optname != IP_XFRM_POLICY &&
955 !ip_mroute_opt(optname)) {
3fdadf7d
DM		 956 lock_sock(sk);
957 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
958 release_sock(sk);
959 }
960#endif
961 return err;
962}
4d52cfbe 963EXPORT_SYMBOL(ip_setsockopt);
3fdadf7d
DM		 964
965#ifdef CONFIG_COMPAT
543d9cfe
ACM		 966int compat_ip_setsockopt(struct sock *sk, int level, int optname,
967 char __user *optval, int optlen)
3fdadf7d
DM		 968{
969 int err;
970
971 if (level != SOL_IP)
972 return -ENOPROTOOPT;
973
dae50295
DS		 974 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
975 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
976 ip_setsockopt);
977
3fdadf7d
DM		 978 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
979#ifdef CONFIG_NETFILTER
980 /* we need to exclude all possible ENOPROTOOPTs except default case */
981 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
6a9fb947
PE		 982 optname != IP_IPSEC_POLICY &&
983 optname != IP_XFRM_POLICY &&
984 !ip_mroute_opt(optname)) {
3fdadf7d 985 lock_sock(sk);
543d9cfe
ACM		 986 err = compat_nf_setsockopt(sk, PF_INET, optname,
987 optval, optlen);
3fdadf7d
DM		 988 release_sock(sk);
989 }
990#endif
991 return err;
992}
543d9cfe 993EXPORT_SYMBOL(compat_ip_setsockopt);
3fdadf7d
DM		 994#endif
995
1da177e4 996/*
4d52cfbe
ED		 997 * Get the options. Note for future reference. The GET of IP options gets
998 * the _received_ ones. The set sets the _sent_ ones.
1da177e4
LT		 999 */
1000
3fdadf7d 1001static int do_ip_getsockopt(struct sock *sk, int level, int optname,
132adf54 1002 char __user *optval, int __user *optlen)
1da177e4
LT		 1003{
1004 struct inet_sock *inet = inet_sk(sk);
1005 int val;
1006 int len;
e905a9ed 1007
132adf54 1008 if (level != SOL_IP)
1da177e4
LT		 1009 return -EOPNOTSUPP;
1010
6a9fb947 1011 if (ip_mroute_opt(optname))
09cb105e 1012 return ip_mroute_getsockopt(sk, optname, optval, optlen);
1da177e4 1013
09cb105e 1014 if (get_user(len, optlen))
1da177e4 1015 return -EFAULT;
132adf54 1016 if (len < 0)
1da177e4 1017 return -EINVAL;
e905a9ed 1018
1da177e4
LT		 1019 lock_sock(sk);
1020
132adf54
SH		 1021 switch (optname) {
1022 case IP_OPTIONS:
1023 {
1024 unsigned char optbuf[sizeof(struct ip_options)+40];
09cb105e 1025 struct ip_options * opt = (struct ip_options *)optbuf;
132adf54
SH		 1026 opt->optlen = 0;
1027 if (inet->opt)
1028 memcpy(optbuf, inet->opt,
1029 sizeof(struct ip_options)+
1030 inet->opt->optlen);
1031 release_sock(sk);
1032
1033 if (opt->optlen == 0)
1034 return put_user(0, optlen);
1035
1036 ip_options_undo(opt);
1037
1038 len = min_t(unsigned int, len, opt->optlen);
1039 if (put_user(len, optlen))
1040 return -EFAULT;
1041 if (copy_to_user(optval, opt->__data, len))
1042 return -EFAULT;
1043 return 0;
1044 }
1045 case IP_PKTINFO:
1046 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
1047 break;
1048 case IP_RECVTTL:
1049 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
1050 break;
1051 case IP_RECVTOS:
1052 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
1053 break;
1054 case IP_RECVOPTS:
1055 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
1056 break;
1057 case IP_RETOPTS:
1058 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
1059 break;
1060 case IP_PASSSEC:
1061 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
1062 break;
e8b2dfe9
BS		 1063 case IP_RECVORIGDSTADDR:
1064 val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0;
1065 break;
132adf54
SH		 1066 case IP_TOS:
1067 val = inet->tos;
1068 break;
1069 case IP_TTL:
1070 val = (inet->uc_ttl == -1 ?
1071 sysctl_ip_default_ttl :
1072 inet->uc_ttl);
1073 break;
1074 case IP_HDRINCL:
1075 val = inet->hdrincl;
1076 break;
1077 case IP_MTU_DISCOVER:
1078 val = inet->pmtudisc;
1079 break;
1080 case IP_MTU:
1081 {
1082 struct dst_entry *dst;
1083 val = 0;
1084 dst = sk_dst_get(sk);
1085 if (dst) {
1086 val = dst_mtu(dst);
1087 dst_release(dst);
1da177e4 1088 }
132adf54 1089 if (!val) {
1da177e4 1090 release_sock(sk);
132adf54 1091 return -ENOTCONN;
1da177e4 1092 }
132adf54
SH		 1093 break;
1094 }
1095 case IP_RECVERR:
1096 val = inet->recverr;
1097 break;
1098 case IP_MULTICAST_TTL:
1099 val = inet->mc_ttl;
1100 break;
1101 case IP_MULTICAST_LOOP:
1102 val = inet->mc_loop;
1103 break;
1104 case IP_MULTICAST_IF:
1105 {
1106 struct in_addr addr;
1107 len = min_t(unsigned int, len, sizeof(struct in_addr));
1108 addr.s_addr = inet->mc_addr;
1109 release_sock(sk);
1da177e4 1110
132adf54
SH		 1111 if (put_user(len, optlen))
1112 return -EFAULT;
1113 if (copy_to_user(optval, &addr, len))
1114 return -EFAULT;
1115 return 0;
1116 }
1117 case IP_MSFILTER:
1118 {
1119 struct ip_msfilter msf;
1120 int err;
1121
1122 if (len < IP_MSFILTER_SIZE(0)) {
1da177e4 1123 release_sock(sk);
132adf54 1124 return -EINVAL;
1da177e4 1125 }
132adf54 1126 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
1da177e4 1127 release_sock(sk);
132adf54 1128 return -EFAULT;
1da177e4 1129 }
132adf54
SH		 1130 err = ip_mc_msfget(sk, &msf,
1131 (struct ip_msfilter __user *)optval, optlen);
1132 release_sock(sk);
1133 return err;
1134 }
1135 case MCAST_MSFILTER:
1136 {
1137 struct group_filter gsf;
1138 int err;
1da177e4 1139
132adf54 1140 if (len < GROUP_FILTER_SIZE(0)) {
1da177e4 1141 release_sock(sk);
132adf54
SH		 1142 return -EINVAL;
1143 }
1144 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
1145 release_sock(sk);
1146 return -EFAULT;
1147 }
1148 err = ip_mc_gsfget(sk, &gsf,
4d52cfbe
ED		 1149 (struct group_filter __user *)optval,
1150 optlen);
132adf54
SH		 1151 release_sock(sk);
1152 return err;
1153 }
1154 case IP_PKTOPTIONS:
1155 {
1156 struct msghdr msg;
1da177e4 1157
132adf54 1158 release_sock(sk);
1da177e4 1159
132adf54
SH		 1160 if (sk->sk_type != SOCK_STREAM)
1161 return -ENOPROTOOPT;
1da177e4 1162
132adf54
SH		 1163 msg.msg_control = optval;
1164 msg.msg_controllen = len;
1165 msg.msg_flags = 0;
1da177e4 1166
132adf54
SH		 1167 if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
1168 struct in_pktinfo info;
1169
1170 info.ipi_addr.s_addr = inet->rcv_saddr;
1171 info.ipi_spec_dst.s_addr = inet->rcv_saddr;
1172 info.ipi_ifindex = inet->mc_index;
1173 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
1da177e4 1174 }
132adf54
SH		 1175 if (inet->cmsg_flags & IP_CMSG_TTL) {
1176 int hlim = inet->mc_ttl;
1177 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
1178 }
1179 len -= msg.msg_controllen;
1180 return put_user(len, optlen);
1181 }
1182 case IP_FREEBIND:
1183 val = inet->freebind;
1184 break;
f5715aea
KK		 1185 case IP_TRANSPARENT:
1186 val = inet->transparent;
1187 break;
132adf54
SH		 1188 default:
1189 release_sock(sk);
1190 return -ENOPROTOOPT;
1da177e4
LT		 1191 }
1192 release_sock(sk);
e905a9ed 1193
4d52cfbe 1194 if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) {
1da177e4
LT		 1195 unsigned char ucval = (unsigned char)val;
1196 len = 1;
132adf54 1197 if (put_user(len, optlen))
1da177e4 1198 return -EFAULT;
09cb105e 1199 if (copy_to_user(optval, &ucval, 1))
1da177e4
LT		 1200 return -EFAULT;
1201 } else {
1202 len = min_t(unsigned int, sizeof(int), len);
132adf54 1203 if (put_user(len, optlen))
1da177e4 1204 return -EFAULT;
09cb105e 1205 if (copy_to_user(optval, &val, len))
1da177e4
LT		 1206 return -EFAULT;
1207 }
1208 return 0;
1209}
1210
3fdadf7d 1211int ip_getsockopt(struct sock *sk, int level,
132adf54 1212 int optname, char __user *optval, int __user *optlen)
3fdadf7d
DM		 1213{
1214 int err;
1215
1216 err = do_ip_getsockopt(sk, level, optname, optval, optlen);
1217#ifdef CONFIG_NETFILTER
1218 /* we need to exclude all possible ENOPROTOOPTs except default case */
6a9fb947
PE		 1219 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1220 !ip_mroute_opt(optname)) {
e905a9ed 1221 int len;
3fdadf7d 1222
09cb105e 1223 if (get_user(len, optlen))
3fdadf7d
DM		 1224 return -EFAULT;
1225
1226 lock_sock(sk);
1227 err = nf_getsockopt(sk, PF_INET, optname, optval,
1228 &len);
1229 release_sock(sk);
1230 if (err >= 0)
1231 err = put_user(len, optlen);
1232 return err;
1233 }
1234#endif
1235 return err;
1236}
4d52cfbe 1237EXPORT_SYMBOL(ip_getsockopt);
3fdadf7d
DM		 1238
1239#ifdef CONFIG_COMPAT
543d9cfe
ACM		 1240int compat_ip_getsockopt(struct sock *sk, int level, int optname,
1241 char __user *optval, int __user *optlen)
3fdadf7d 1242{
42908c69
DS		 1243 int err;
1244
1245 if (optname == MCAST_MSFILTER)
1246 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1247 ip_getsockopt);
1248
1249 err = do_ip_getsockopt(sk, level, optname, optval, optlen);
1250
3fdadf7d
DM		 1251#ifdef CONFIG_NETFILTER
1252 /* we need to exclude all possible ENOPROTOOPTs except default case */
6a9fb947
PE		 1253 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1254 !ip_mroute_opt(optname)) {
e905a9ed 1255 int len;
3fdadf7d 1256
543d9cfe 1257 if (get_user(len, optlen))
3fdadf7d
DM		 1258 return -EFAULT;
1259
1260 lock_sock(sk);
543d9cfe 1261 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
3fdadf7d
DM		 1262 release_sock(sk);
1263 if (err >= 0)
1264 err = put_user(len, optlen);
1265 return err;
1266 }
1267#endif
1268 return err;
1269}
543d9cfe 1270EXPORT_SYMBOL(compat_ip_getsockopt);
3fdadf7d 1271#endif
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