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Merge remote branch 'anholt/drm-intel-next' into drm-linus
[linux-2.6-block.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;
511c3f92 60 struct rtable *rt = skb_rtable(skb);
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,
b7058842 443 int optname, char __user *optval, unsigned 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 ||
f771bef9 456 optname == IP_MULTICAST_ALL ||
e8b2dfe9
BS		 457 optname == IP_MULTICAST_LOOP ||
458 optname == IP_RECVORIGDSTADDR) {
1da177e4
LT		 459 if (optlen >= sizeof(int)) {
460 if (get_user(val, (int __user *) optval))
461 return -EFAULT;
462 } else if (optlen >= sizeof(char)) {
463 unsigned char ucval;
464
465 if (get_user(ucval, (unsigned char __user *) optval))
466 return -EFAULT;
467 val = (int) ucval;
468 }
469 }
470
471 /* If optlen==0, it is equivalent to val == 0 */
472
6a9fb947 473 if (ip_mroute_opt(optname))
09cb105e 474 return ip_mroute_setsockopt(sk, optname, optval, optlen);
1da177e4
LT		 475
476 err = 0;
477 lock_sock(sk);
478
479 switch (optname) {
132adf54
SH		 480 case IP_OPTIONS:
481 {
4d52cfbe 482 struct ip_options *opt = NULL;
132adf54
SH		 483 if (optlen > 40 || optlen < 0)
484 goto e_inval;
3b1e0a65 485 err = ip_options_get_from_user(sock_net(sk), &opt,
cb84663e 486 optval, optlen);
132adf54
SH		 487 if (err)
488 break;
489 if (inet->is_icsk) {
490 struct inet_connection_sock *icsk = inet_csk(sk);
1da177e4 491#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
132adf54
SH		 492 if (sk->sk_family == PF_INET ||
493 (!((1 << sk->sk_state) &
494 (TCPF_LISTEN | TCPF_CLOSE)) &&
495 inet->daddr != LOOPBACK4_IPV6)) {
1da177e4 496#endif
132adf54
SH		 497 if (inet->opt)
498 icsk->icsk_ext_hdr_len -= inet->opt->optlen;
499 if (opt)
500 icsk->icsk_ext_hdr_len += opt->optlen;
501 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
1da177e4 502#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1da177e4 503 }
132adf54 504#endif
1da177e4 505 }
132adf54
SH		 506 opt = xchg(&inet->opt, opt);
507 kfree(opt);
508 break;
509 }
510 case IP_PKTINFO:
511 if (val)
512 inet->cmsg_flags |= IP_CMSG_PKTINFO;
513 else
514 inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
515 break;
516 case IP_RECVTTL:
517 if (val)
518 inet->cmsg_flags |= IP_CMSG_TTL;
519 else
520 inet->cmsg_flags &= ~IP_CMSG_TTL;
521 break;
522 case IP_RECVTOS:
523 if (val)
524 inet->cmsg_flags |= IP_CMSG_TOS;
525 else
526 inet->cmsg_flags &= ~IP_CMSG_TOS;
527 break;
528 case IP_RECVOPTS:
529 if (val)
530 inet->cmsg_flags |= IP_CMSG_RECVOPTS;
531 else
532 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
533 break;
534 case IP_RETOPTS:
535 if (val)
536 inet->cmsg_flags |= IP_CMSG_RETOPTS;
537 else
538 inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
539 break;
540 case IP_PASSSEC:
541 if (val)
542 inet->cmsg_flags |= IP_CMSG_PASSSEC;
543 else
544 inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
545 break;
e8b2dfe9
BS		 546 case IP_RECVORIGDSTADDR:
547 if (val)
548 inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR;
549 else
550 inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR;
551 break;
132adf54
SH		 552 case IP_TOS: /* This sets both TOS and Precedence */
553 if (sk->sk_type == SOCK_STREAM) {
554 val &= ~3;
555 val |= inet->tos & 3;
556 }
132adf54
SH		 557 if (inet->tos != val) {
558 inet->tos = val;
559 sk->sk_priority = rt_tos2priority(val);
560 sk_dst_reset(sk);
561 }
562 break;
563 case IP_TTL:
4d52cfbe 564 if (optlen < 1)
132adf54 565 goto e_inval;
4d52cfbe 566 if (val != -1 && (val < 0 || val > 255))
132adf54
SH		 567 goto e_inval;
568 inet->uc_ttl = val;
569 break;
570 case IP_HDRINCL:
571 if (sk->sk_type != SOCK_RAW) {
572 err = -ENOPROTOOPT;
2c7946a7 573 break;
132adf54
SH		 574 }
575 inet->hdrincl = val ? 1 : 0;
576 break;
577 case IP_MTU_DISCOVER:
4d52cfbe 578 if (val < 0 || val > 3)
132adf54
SH		 579 goto e_inval;
580 inet->pmtudisc = val;
581 break;
582 case IP_RECVERR:
583 inet->recverr = !!val;
584 if (!val)
585 skb_queue_purge(&sk->sk_error_queue);
586 break;
587 case IP_MULTICAST_TTL:
588 if (sk->sk_type == SOCK_STREAM)
589 goto e_inval;
4d52cfbe 590 if (optlen < 1)
132adf54 591 goto e_inval;
09cb105e 592 if (val == -1)
132adf54
SH		 593 val = 1;
594 if (val < 0 || val > 255)
595 goto e_inval;
596 inet->mc_ttl = val;
597 break;
598 case IP_MULTICAST_LOOP:
4d52cfbe 599 if (optlen < 1)
132adf54
SH		 600 goto e_inval;
601 inet->mc_loop = !!val;
602 break;
603 case IP_MULTICAST_IF:
604 {
605 struct ip_mreqn mreq;
606 struct net_device *dev = NULL;
607
608 if (sk->sk_type == SOCK_STREAM)
609 goto e_inval;
610 /*
611 * Check the arguments are allowable
612 */
613
0915921b
SW		 614 if (optlen < sizeof(struct in_addr))
615 goto e_inval;
616
132adf54
SH		 617 err = -EFAULT;
618 if (optlen >= sizeof(struct ip_mreqn)) {
09cb105e 619 if (copy_from_user(&mreq, optval, sizeof(mreq)))
1da177e4 620 break;
132adf54
SH		 621 } else {
622 memset(&mreq, 0, sizeof(mreq));
623 if (optlen >= sizeof(struct in_addr) &&
4d52cfbe
ED		 624 copy_from_user(&mreq.imr_address, optval,
625 sizeof(struct in_addr)))
132adf54
SH		 626 break;
627 }
628
629 if (!mreq.imr_ifindex) {
e6f1cebf 630 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) {
132adf54
SH		 631 inet->mc_index = 0;
632 inet->mc_addr = 0;
633 err = 0;
1da177e4
LT		 634 break;
635 }
3b1e0a65 636 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr);
55b80503 637 if (dev)
132adf54 638 mreq.imr_ifindex = dev->ifindex;
132adf54 639 } else
55b80503 640 dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex);
1da177e4 641
1da177e4 642
132adf54
SH		 643 err = -EADDRNOTAVAIL;
644 if (!dev)
645 break;
55b80503 646 dev_put(dev);
132adf54
SH		 647
648 err = -EINVAL;
649 if (sk->sk_bound_dev_if &&
650 mreq.imr_ifindex != sk->sk_bound_dev_if)
651 break;
1da177e4 652
132adf54
SH		 653 inet->mc_index = mreq.imr_ifindex;
654 inet->mc_addr = mreq.imr_address.s_addr;
655 err = 0;
656 break;
657 }
1da177e4 658
132adf54
SH		 659 case IP_ADD_MEMBERSHIP:
660 case IP_DROP_MEMBERSHIP:
661 {
662 struct ip_mreqn mreq;
1da177e4 663
a96fb49b
FL		 664 err = -EPROTO;
665 if (inet_sk(sk)->is_icsk)
666 break;
667
132adf54
SH		 668 if (optlen < sizeof(struct ip_mreq))
669 goto e_inval;
670 err = -EFAULT;
671 if (optlen >= sizeof(struct ip_mreqn)) {
09cb105e 672 if (copy_from_user(&mreq, optval, sizeof(mreq)))
1da177e4 673 break;
132adf54
SH		 674 } else {
675 memset(&mreq, 0, sizeof(mreq));
09cb105e 676 if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq)))
1da177e4 677 break;
132adf54 678 }
1da177e4 679
132adf54
SH		 680 if (optname == IP_ADD_MEMBERSHIP)
681 err = ip_mc_join_group(sk, &mreq);
682 else
683 err = ip_mc_leave_group(sk, &mreq);
684 break;
685 }
686 case IP_MSFILTER:
687 {
132adf54
SH		 688 struct ip_msfilter *msf;
689
690 if (optlen < IP_MSFILTER_SIZE(0))
691 goto e_inval;
692 if (optlen > sysctl_optmem_max) {
693 err = -ENOBUFS;
1da177e4
LT		 694 break;
695 }
132adf54 696 msf = kmalloc(optlen, GFP_KERNEL);
cfcabdcc 697 if (!msf) {
132adf54
SH		 698 err = -ENOBUFS;
699 break;
700 }
701 err = -EFAULT;
702 if (copy_from_user(msf, optval, optlen)) {
703 kfree(msf);
704 break;
705 }
706 /* numsrc >= (1G-4) overflow in 32 bits */
707 if (msf->imsf_numsrc >= 0x3ffffffcU ||
708 msf->imsf_numsrc > sysctl_igmp_max_msf) {
709 kfree(msf);
710 err = -ENOBUFS;
711 break;
712 }
713 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
714 kfree(msf);
715 err = -EINVAL;
716 break;
717 }
718 err = ip_mc_msfilter(sk, msf, 0);
719 kfree(msf);
720 break;
721 }
722 case IP_BLOCK_SOURCE:
723 case IP_UNBLOCK_SOURCE:
724 case IP_ADD_SOURCE_MEMBERSHIP:
725 case IP_DROP_SOURCE_MEMBERSHIP:
726 {
727 struct ip_mreq_source mreqs;
728 int omode, add;
1da177e4 729
132adf54
SH		 730 if (optlen != sizeof(struct ip_mreq_source))
731 goto e_inval;
732 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
1da177e4 733 err = -EFAULT;
1da177e4
LT		 734 break;
735 }
132adf54
SH		 736 if (optname == IP_BLOCK_SOURCE) {
737 omode = MCAST_EXCLUDE;
738 add = 1;
739 } else if (optname == IP_UNBLOCK_SOURCE) {
740 omode = MCAST_EXCLUDE;
741 add = 0;
742 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
743 struct ip_mreqn mreq;
1da177e4 744
132adf54
SH		 745 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
746 mreq.imr_address.s_addr = mreqs.imr_interface;
747 mreq.imr_ifindex = 0;
748 err = ip_mc_join_group(sk, &mreq);
749 if (err && err != -EADDRINUSE)
1da177e4 750 break;
132adf54
SH		 751 omode = MCAST_INCLUDE;
752 add = 1;
753 } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
754 omode = MCAST_INCLUDE;
755 add = 0;
756 }
757 err = ip_mc_source(add, omode, sk, &mreqs, 0);
758 break;
759 }
760 case MCAST_JOIN_GROUP:
761 case MCAST_LEAVE_GROUP:
762 {
763 struct group_req greq;
764 struct sockaddr_in *psin;
765 struct ip_mreqn mreq;
766
767 if (optlen < sizeof(struct group_req))
768 goto e_inval;
769 err = -EFAULT;
770 if (copy_from_user(&greq, optval, sizeof(greq)))
771 break;
772 psin = (struct sockaddr_in *)&greq.gr_group;
773 if (psin->sin_family != AF_INET)
774 goto e_inval;
775 memset(&mreq, 0, sizeof(mreq));
776 mreq.imr_multiaddr = psin->sin_addr;
777 mreq.imr_ifindex = greq.gr_interface;
778
779 if (optname == MCAST_JOIN_GROUP)
780 err = ip_mc_join_group(sk, &mreq);
781 else
782 err = ip_mc_leave_group(sk, &mreq);
783 break;
784 }
785 case MCAST_JOIN_SOURCE_GROUP:
786 case MCAST_LEAVE_SOURCE_GROUP:
787 case MCAST_BLOCK_SOURCE:
788 case MCAST_UNBLOCK_SOURCE:
789 {
790 struct group_source_req greqs;
791 struct ip_mreq_source mreqs;
792 struct sockaddr_in *psin;
793 int omode, add;
794
795 if (optlen != sizeof(struct group_source_req))
796 goto e_inval;
797 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
1da177e4 798 err = -EFAULT;
1da177e4
LT		 799 break;
800 }
132adf54
SH		 801 if (greqs.gsr_group.ss_family != AF_INET ||
802 greqs.gsr_source.ss_family != AF_INET) {
803 err = -EADDRNOTAVAIL;
1da177e4
LT		 804 break;
805 }
132adf54
SH		 806 psin = (struct sockaddr_in *)&greqs.gsr_group;
807 mreqs.imr_multiaddr = psin->sin_addr.s_addr;
808 psin = (struct sockaddr_in *)&greqs.gsr_source;
809 mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
810 mreqs.imr_interface = 0; /* use index for mc_source */
811
812 if (optname == MCAST_BLOCK_SOURCE) {
813 omode = MCAST_EXCLUDE;
814 add = 1;
815 } else if (optname == MCAST_UNBLOCK_SOURCE) {
816 omode = MCAST_EXCLUDE;
817 add = 0;
818 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
1da177e4
LT		 819 struct ip_mreqn mreq;
820
132adf54 821 psin = (struct sockaddr_in *)&greqs.gsr_group;
1da177e4 822 mreq.imr_multiaddr = psin->sin_addr;
132adf54
SH		 823 mreq.imr_address.s_addr = 0;
824 mreq.imr_ifindex = greqs.gsr_interface;
825 err = ip_mc_join_group(sk, &mreq);
826 if (err && err != -EADDRINUSE)
827 break;
828 greqs.gsr_interface = mreq.imr_ifindex;
829 omode = MCAST_INCLUDE;
830 add = 1;
831 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
832 omode = MCAST_INCLUDE;
833 add = 0;
834 }
835 err = ip_mc_source(add, omode, sk, &mreqs,
836 greqs.gsr_interface);
837 break;
838 }
839 case MCAST_MSFILTER:
840 {
132adf54
SH		 841 struct sockaddr_in *psin;
842 struct ip_msfilter *msf = NULL;
843 struct group_filter *gsf = NULL;
844 int msize, i, ifindex;
845
846 if (optlen < GROUP_FILTER_SIZE(0))
847 goto e_inval;
848 if (optlen > sysctl_optmem_max) {
849 err = -ENOBUFS;
1da177e4
LT		 850 break;
851 }
09cb105e 852 gsf = kmalloc(optlen, GFP_KERNEL);
cfcabdcc 853 if (!gsf) {
132adf54 854 err = -ENOBUFS;
1da177e4
LT		 855 break;
856 }
132adf54 857 err = -EFAULT;
4d52cfbe 858 if (copy_from_user(gsf, optval, optlen))
132adf54 859 goto mc_msf_out;
4d52cfbe 860
132adf54
SH		 861 /* numsrc >= (4G-140)/128 overflow in 32 bits */
862 if (gsf->gf_numsrc >= 0x1ffffff ||
863 gsf->gf_numsrc > sysctl_igmp_max_msf) {
864 err = -ENOBUFS;
865 goto mc_msf_out;
866 }
867 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
868 err = -EINVAL;
869 goto mc_msf_out;
870 }
871 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
09cb105e 872 msf = kmalloc(msize, GFP_KERNEL);
cfcabdcc 873 if (!msf) {
132adf54
SH		 874 err = -ENOBUFS;
875 goto mc_msf_out;
876 }
877 ifindex = gsf->gf_interface;
878 psin = (struct sockaddr_in *)&gsf->gf_group;
879 if (psin->sin_family != AF_INET) {
1da177e4 880 err = -EADDRNOTAVAIL;
132adf54 881 goto mc_msf_out;
1da177e4 882 }
132adf54
SH		 883 msf->imsf_multiaddr = psin->sin_addr.s_addr;
884 msf->imsf_interface = 0;
885 msf->imsf_fmode = gsf->gf_fmode;
886 msf->imsf_numsrc = gsf->gf_numsrc;
887 err = -EADDRNOTAVAIL;
4d52cfbe 888 for (i = 0; i < gsf->gf_numsrc; ++i) {
132adf54 889 psin = (struct sockaddr_in *)&gsf->gf_slist[i];
e905a9ed 890
132adf54
SH		 891 if (psin->sin_family != AF_INET)
892 goto mc_msf_out;
893 msf->imsf_slist[i] = psin->sin_addr.s_addr;
894 }
895 kfree(gsf);
896 gsf = NULL;
897
898 err = ip_mc_msfilter(sk, msf, ifindex);
4d52cfbe 899mc_msf_out:
132adf54
SH		 900 kfree(msf);
901 kfree(gsf);
902 break;
903 }
f771bef9
NS		 904 case IP_MULTICAST_ALL:
905 if (optlen < 1)
906 goto e_inval;
907 if (val != 0 && val != 1)
908 goto e_inval;
909 inet->mc_all = val;
910 break;
132adf54
SH		 911 case IP_ROUTER_ALERT:
912 err = ip_ra_control(sk, val ? 1 : 0, NULL);
913 break;
914
915 case IP_FREEBIND:
4d52cfbe 916 if (optlen < 1)
132adf54
SH		 917 goto e_inval;
918 inet->freebind = !!val;
919 break;
920
921 case IP_IPSEC_POLICY:
922 case IP_XFRM_POLICY:
923 err = -EPERM;
924 if (!capable(CAP_NET_ADMIN))
1da177e4 925 break;
132adf54
SH		 926 err = xfrm_user_policy(sk, optname, optval, optlen);
927 break;
1da177e4 928
f5715aea
KK		 929 case IP_TRANSPARENT:
930 if (!capable(CAP_NET_ADMIN)) {
931 err = -EPERM;
932 break;
933 }
934 if (optlen < 1)
935 goto e_inval;
936 inet->transparent = !!val;
937 break;
938
132adf54
SH		 939 default:
940 err = -ENOPROTOOPT;
941 break;
1da177e4
LT		 942 }
943 release_sock(sk);
944 return err;
945
946e_inval:
947 release_sock(sk);
948 return -EINVAL;
949}
950
3fdadf7d 951int ip_setsockopt(struct sock *sk, int level,
b7058842 952 int optname, char __user *optval, unsigned int optlen)
3fdadf7d
DM		 953{
954 int err;
955
956 if (level != SOL_IP)
957 return -ENOPROTOOPT;
958
959 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
960#ifdef CONFIG_NETFILTER
961 /* we need to exclude all possible ENOPROTOOPTs except default case */
962 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
6a9fb947
PE		 963 optname != IP_IPSEC_POLICY &&
964 optname != IP_XFRM_POLICY &&
965 !ip_mroute_opt(optname)) {
3fdadf7d
DM		 966 lock_sock(sk);
967 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
968 release_sock(sk);
969 }
970#endif
971 return err;
972}
4d52cfbe 973EXPORT_SYMBOL(ip_setsockopt);
3fdadf7d
DM		 974
975#ifdef CONFIG_COMPAT
543d9cfe 976int compat_ip_setsockopt(struct sock *sk, int level, int optname,
b7058842 977 char __user *optval, unsigned int optlen)
3fdadf7d
DM		 978{
979 int err;
980
981 if (level != SOL_IP)
982 return -ENOPROTOOPT;
983
dae50295
DS		 984 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
985 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
986 ip_setsockopt);
987
3fdadf7d
DM		 988 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
989#ifdef CONFIG_NETFILTER
990 /* we need to exclude all possible ENOPROTOOPTs except default case */
991 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
6a9fb947
PE		 992 optname != IP_IPSEC_POLICY &&
993 optname != IP_XFRM_POLICY &&
994 !ip_mroute_opt(optname)) {
3fdadf7d 995 lock_sock(sk);
543d9cfe
ACM		 996 err = compat_nf_setsockopt(sk, PF_INET, optname,
997 optval, optlen);
3fdadf7d
DM		 998 release_sock(sk);
999 }
1000#endif
1001 return err;
1002}
543d9cfe 1003EXPORT_SYMBOL(compat_ip_setsockopt);
3fdadf7d
DM		 1004#endif
1005
1da177e4 1006/*
4d52cfbe
ED		 1007 * Get the options. Note for future reference. The GET of IP options gets
1008 * the _received_ ones. The set sets the _sent_ ones.
1da177e4
LT		 1009 */
1010
3fdadf7d 1011static int do_ip_getsockopt(struct sock *sk, int level, int optname,
132adf54 1012 char __user *optval, int __user *optlen)
1da177e4
LT		 1013{
1014 struct inet_sock *inet = inet_sk(sk);
1015 int val;
1016 int len;
e905a9ed 1017
132adf54 1018 if (level != SOL_IP)
1da177e4
LT		 1019 return -EOPNOTSUPP;
1020
6a9fb947 1021 if (ip_mroute_opt(optname))
09cb105e 1022 return ip_mroute_getsockopt(sk, optname, optval, optlen);
1da177e4 1023
09cb105e 1024 if (get_user(len, optlen))
1da177e4 1025 return -EFAULT;
132adf54 1026 if (len < 0)
1da177e4 1027 return -EINVAL;
e905a9ed 1028
1da177e4
LT		 1029 lock_sock(sk);
1030
132adf54
SH		 1031 switch (optname) {
1032 case IP_OPTIONS:
1033 {
1034 unsigned char optbuf[sizeof(struct ip_options)+40];
09cb105e 1035 struct ip_options * opt = (struct ip_options *)optbuf;
132adf54
SH		 1036 opt->optlen = 0;
1037 if (inet->opt)
1038 memcpy(optbuf, inet->opt,
1039 sizeof(struct ip_options)+
1040 inet->opt->optlen);
1041 release_sock(sk);
1042
1043 if (opt->optlen == 0)
1044 return put_user(0, optlen);
1045
1046 ip_options_undo(opt);
1047
1048 len = min_t(unsigned int, len, opt->optlen);
1049 if (put_user(len, optlen))
1050 return -EFAULT;
1051 if (copy_to_user(optval, opt->__data, len))
1052 return -EFAULT;
1053 return 0;
1054 }
1055 case IP_PKTINFO:
1056 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
1057 break;
1058 case IP_RECVTTL:
1059 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
1060 break;
1061 case IP_RECVTOS:
1062 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
1063 break;
1064 case IP_RECVOPTS:
1065 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
1066 break;
1067 case IP_RETOPTS:
1068 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
1069 break;
1070 case IP_PASSSEC:
1071 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
1072 break;
e8b2dfe9
BS		 1073 case IP_RECVORIGDSTADDR:
1074 val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0;
1075 break;
132adf54
SH		 1076 case IP_TOS:
1077 val = inet->tos;
1078 break;
1079 case IP_TTL:
1080 val = (inet->uc_ttl == -1 ?
1081 sysctl_ip_default_ttl :
1082 inet->uc_ttl);
1083 break;
1084 case IP_HDRINCL:
1085 val = inet->hdrincl;
1086 break;
1087 case IP_MTU_DISCOVER:
1088 val = inet->pmtudisc;
1089 break;
1090 case IP_MTU:
1091 {
1092 struct dst_entry *dst;
1093 val = 0;
1094 dst = sk_dst_get(sk);
1095 if (dst) {
1096 val = dst_mtu(dst);
1097 dst_release(dst);
1da177e4 1098 }
132adf54 1099 if (!val) {
1da177e4 1100 release_sock(sk);
132adf54 1101 return -ENOTCONN;
1da177e4 1102 }
132adf54
SH		 1103 break;
1104 }
1105 case IP_RECVERR:
1106 val = inet->recverr;
1107 break;
1108 case IP_MULTICAST_TTL:
1109 val = inet->mc_ttl;
1110 break;
1111 case IP_MULTICAST_LOOP:
1112 val = inet->mc_loop;
1113 break;
1114 case IP_MULTICAST_IF:
1115 {
1116 struct in_addr addr;
1117 len = min_t(unsigned int, len, sizeof(struct in_addr));
1118 addr.s_addr = inet->mc_addr;
1119 release_sock(sk);
1da177e4 1120
132adf54
SH		 1121 if (put_user(len, optlen))
1122 return -EFAULT;
1123 if (copy_to_user(optval, &addr, len))
1124 return -EFAULT;
1125 return 0;
1126 }
1127 case IP_MSFILTER:
1128 {
1129 struct ip_msfilter msf;
1130 int err;
1131
1132 if (len < IP_MSFILTER_SIZE(0)) {
1da177e4 1133 release_sock(sk);
132adf54 1134 return -EINVAL;
1da177e4 1135 }
132adf54 1136 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
1da177e4 1137 release_sock(sk);
132adf54 1138 return -EFAULT;
1da177e4 1139 }
132adf54
SH		 1140 err = ip_mc_msfget(sk, &msf,
1141 (struct ip_msfilter __user *)optval, optlen);
1142 release_sock(sk);
1143 return err;
1144 }
1145 case MCAST_MSFILTER:
1146 {
1147 struct group_filter gsf;
1148 int err;
1da177e4 1149
132adf54 1150 if (len < GROUP_FILTER_SIZE(0)) {
1da177e4 1151 release_sock(sk);
132adf54
SH		 1152 return -EINVAL;
1153 }
1154 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
1155 release_sock(sk);
1156 return -EFAULT;
1157 }
1158 err = ip_mc_gsfget(sk, &gsf,
4d52cfbe
ED		 1159 (struct group_filter __user *)optval,
1160 optlen);
132adf54
SH		 1161 release_sock(sk);
1162 return err;
1163 }
f771bef9
NS		 1164 case IP_MULTICAST_ALL:
1165 val = inet->mc_all;
1166 break;
132adf54
SH		 1167 case IP_PKTOPTIONS:
1168 {
1169 struct msghdr msg;
1da177e4 1170
132adf54 1171 release_sock(sk);
1da177e4 1172
132adf54
SH		 1173 if (sk->sk_type != SOCK_STREAM)
1174 return -ENOPROTOOPT;
1da177e4 1175
132adf54
SH		 1176 msg.msg_control = optval;
1177 msg.msg_controllen = len;
1178 msg.msg_flags = 0;
1da177e4 1179
132adf54
SH		 1180 if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
1181 struct in_pktinfo info;
1182
1183 info.ipi_addr.s_addr = inet->rcv_saddr;
1184 info.ipi_spec_dst.s_addr = inet->rcv_saddr;
1185 info.ipi_ifindex = inet->mc_index;
1186 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
1da177e4 1187 }
132adf54
SH		 1188 if (inet->cmsg_flags & IP_CMSG_TTL) {
1189 int hlim = inet->mc_ttl;
1190 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
1191 }
1192 len -= msg.msg_controllen;
1193 return put_user(len, optlen);
1194 }
1195 case IP_FREEBIND:
1196 val = inet->freebind;
1197 break;
f5715aea
KK		 1198 case IP_TRANSPARENT:
1199 val = inet->transparent;
1200 break;
132adf54
SH		 1201 default:
1202 release_sock(sk);
1203 return -ENOPROTOOPT;
1da177e4
LT		 1204 }
1205 release_sock(sk);
e905a9ed 1206
4d52cfbe 1207 if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) {
1da177e4
LT		 1208 unsigned char ucval = (unsigned char)val;
1209 len = 1;
132adf54 1210 if (put_user(len, optlen))
1da177e4 1211 return -EFAULT;
09cb105e 1212 if (copy_to_user(optval, &ucval, 1))
1da177e4
LT		 1213 return -EFAULT;
1214 } else {
1215 len = min_t(unsigned int, sizeof(int), len);
132adf54 1216 if (put_user(len, optlen))
1da177e4 1217 return -EFAULT;
09cb105e 1218 if (copy_to_user(optval, &val, len))
1da177e4
LT		 1219 return -EFAULT;
1220 }
1221 return 0;
1222}
1223
3fdadf7d 1224int ip_getsockopt(struct sock *sk, int level,
132adf54 1225 int optname, char __user *optval, int __user *optlen)
3fdadf7d
DM		 1226{
1227 int err;
1228
1229 err = do_ip_getsockopt(sk, level, optname, optval, optlen);
1230#ifdef CONFIG_NETFILTER
1231 /* we need to exclude all possible ENOPROTOOPTs except default case */
6a9fb947
PE		 1232 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1233 !ip_mroute_opt(optname)) {
e905a9ed 1234 int len;
3fdadf7d 1235
09cb105e 1236 if (get_user(len, optlen))
3fdadf7d
DM		 1237 return -EFAULT;
1238
1239 lock_sock(sk);
1240 err = nf_getsockopt(sk, PF_INET, optname, optval,
1241 &len);
1242 release_sock(sk);
1243 if (err >= 0)
1244 err = put_user(len, optlen);
1245 return err;
1246 }
1247#endif
1248 return err;
1249}
4d52cfbe 1250EXPORT_SYMBOL(ip_getsockopt);
3fdadf7d
DM		 1251
1252#ifdef CONFIG_COMPAT
543d9cfe
ACM		 1253int compat_ip_getsockopt(struct sock *sk, int level, int optname,
1254 char __user *optval, int __user *optlen)
3fdadf7d 1255{
42908c69
DS		 1256 int err;
1257
1258 if (optname == MCAST_MSFILTER)
1259 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1260 ip_getsockopt);
1261
1262 err = do_ip_getsockopt(sk, level, optname, optval, optlen);
1263
3fdadf7d
DM		 1264#ifdef CONFIG_NETFILTER
1265 /* we need to exclude all possible ENOPROTOOPTs except default case */
6a9fb947
PE		 1266 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1267 !ip_mroute_opt(optname)) {
e905a9ed 1268 int len;
3fdadf7d 1269
543d9cfe 1270 if (get_user(len, optlen))
3fdadf7d
DM		 1271 return -EFAULT;
1272
1273 lock_sock(sk);
543d9cfe 1274 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
3fdadf7d
DM		 1275 release_sock(sk);
1276 if (err >= 0)
1277 err = put_user(len, optlen);
1278 return err;
1279 }
1280#endif
1281 return err;
1282}
543d9cfe 1283EXPORT_SYMBOL(compat_ip_getsockopt);
3fdadf7d 1284#endif
Linux 6.x block layer and io_uring tree(s)