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qeth: handle missing z/VM authorization of OSX
[GitHub/mt8127/android_kernel_alcatel_ttab.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 25#include <linux/netdevice.h>
5a0e3ad6 26#include <linux/slab.h>
1da177e4
LT		 27#include <net/sock.h>
28#include <net/ip.h>
29#include <net/icmp.h>
d83d8461 30#include <net/tcp_states.h>
1da177e4
LT		 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/route.h>
37#include <net/xfrm.h>
dae50295 38#include <net/compat.h>
1da177e4
LT		 39#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
40#include <net/transp_v6.h>
41#endif
42
43#include <linux/errqueue.h>
44#include <asm/uaccess.h>
45
46#define IP_CMSG_PKTINFO 1
47#define IP_CMSG_TTL 2
48#define IP_CMSG_TOS 4
49#define IP_CMSG_RECVOPTS 8
50#define IP_CMSG_RETOPTS 16
2c7946a7 51#define IP_CMSG_PASSSEC 32
e8b2dfe9 52#define IP_CMSG_ORIGDSTADDR 64
1da177e4
LT		 53
54/*
55 * SOL_IP control messages.
56 */
57
58static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb)
59{
60 struct in_pktinfo info;
511c3f92 61 struct rtable *rt = skb_rtable(skb);
1da177e4 62
eddc9ec5 63 info.ipi_addr.s_addr = ip_hdr(skb)->daddr;
1da177e4
LT		 64 if (rt) {
65 info.ipi_ifindex = rt->rt_iif;
66 info.ipi_spec_dst.s_addr = rt->rt_spec_dst;
67 } else {
68 info.ipi_ifindex = 0;
69 info.ipi_spec_dst.s_addr = 0;
70 }
71
72 put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
73}
74
75static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb)
76{
eddc9ec5 77 int ttl = ip_hdr(skb)->ttl;
1da177e4
LT		 78 put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl);
79}
80
81static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb)
82{
eddc9ec5 83 put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos);
1da177e4
LT		 84}
85
86static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb)
87{
88 if (IPCB(skb)->opt.optlen == 0)
89 return;
90
eddc9ec5
ACM		 91 put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen,
92 ip_hdr(skb) + 1);
1da177e4
LT		 93}
94
95
96static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb)
97{
98 unsigned char optbuf[sizeof(struct ip_options) + 40];
09cb105e 99 struct ip_options * opt = (struct ip_options *)optbuf;
1da177e4
LT		 100
101 if (IPCB(skb)->opt.optlen == 0)
102 return;
103
104 if (ip_options_echo(opt, skb)) {
105 msg->msg_flags |= MSG_CTRUNC;
106 return;
107 }
108 ip_options_undo(opt);
109
110 put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data);
111}
112
2c7946a7
CZ		 113static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
114{
115 char *secdata;
dc49c1f9 116 u32 seclen, secid;
2c7946a7
CZ		 117 int err;
118
dc49c1f9
CZ		 119 err = security_socket_getpeersec_dgram(NULL, skb, &secid);
120 if (err)
121 return;
122
123 err = security_secid_to_secctx(secid, &secdata, &seclen);
2c7946a7
CZ		 124 if (err)
125 return;
126
127 put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata);
dc49c1f9 128 security_release_secctx(secdata, seclen);
2c7946a7
CZ		 129}
130
21d1a161 131static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb)
e8b2dfe9
BS		 132{
133 struct sockaddr_in sin;
134 struct iphdr *iph = ip_hdr(skb);
21d1a161 135 __be16 *ports = (__be16 *)skb_transport_header(skb);
e8b2dfe9
BS		 136
137 if (skb_transport_offset(skb) + 4 > skb->len)
138 return;
139
140 /* All current transport protocols have the port numbers in the
141 * first four bytes of the transport header and this function is
142 * written with this assumption in mind.
143 */
144
145 sin.sin_family = AF_INET;
146 sin.sin_addr.s_addr = iph->daddr;
147 sin.sin_port = ports[1];
148 memset(sin.sin_zero, 0, sizeof(sin.sin_zero));
149
150 put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin);
151}
1da177e4
LT		 152
153void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
154{
155 struct inet_sock *inet = inet_sk(skb->sk);
156 unsigned flags = inet->cmsg_flags;
157
158 /* Ordered by supposed usage frequency */
159 if (flags & 1)
160 ip_cmsg_recv_pktinfo(msg, skb);
4d52cfbe 161 if ((flags >>= 1) == 0)
1da177e4
LT		 162 return;
163
164 if (flags & 1)
165 ip_cmsg_recv_ttl(msg, skb);
4d52cfbe 166 if ((flags >>= 1) == 0)
1da177e4
LT		 167 return;
168
169 if (flags & 1)
170 ip_cmsg_recv_tos(msg, skb);
4d52cfbe 171 if ((flags >>= 1) == 0)
1da177e4
LT		 172 return;
173
174 if (flags & 1)
175 ip_cmsg_recv_opts(msg, skb);
4d52cfbe 176 if ((flags >>= 1) == 0)
1da177e4
LT		 177 return;
178
179 if (flags & 1)
180 ip_cmsg_recv_retopts(msg, skb);
4d52cfbe 181 if ((flags >>= 1) == 0)
2c7946a7
CZ		 182 return;
183
184 if (flags & 1)
185 ip_cmsg_recv_security(msg, skb);
e8b2dfe9 186
4d52cfbe 187 if ((flags >>= 1) == 0)
e8b2dfe9
BS		 188 return;
189 if (flags & 1)
190 ip_cmsg_recv_dstaddr(msg, skb);
191
1da177e4 192}
4d52cfbe 193EXPORT_SYMBOL(ip_cmsg_recv);
1da177e4 194
7a6adb92 195int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc)
1da177e4
LT		 196{
197 int err;
198 struct cmsghdr *cmsg;
199
200 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
201 if (!CMSG_OK(msg, cmsg))
202 return -EINVAL;
203 if (cmsg->cmsg_level != SOL_IP)
204 continue;
205 switch (cmsg->cmsg_type) {
206 case IP_RETOPTS:
207 err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
4d52cfbe
ED		 208 err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg),
209 err < 40 ? err : 40);
1da177e4
LT		 210 if (err)
211 return err;
212 break;
213 case IP_PKTINFO:
214 {
215 struct in_pktinfo *info;
216 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
217 return -EINVAL;
218 info = (struct in_pktinfo *)CMSG_DATA(cmsg);
219 ipc->oif = info->ipi_ifindex;
220 ipc->addr = info->ipi_spec_dst.s_addr;
221 break;
222 }
223 default:
224 return -EINVAL;
225 }
226 }
227 return 0;
228}
229
230
231/* Special input handler for packets caught by router alert option.
232 They are selected only by protocol field, and then processed likely
233 local ones; but only if someone wants them! Otherwise, router
234 not running rsvpd will kill RSVP.
235
236 It is user level problem, what it will make with them.
237 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
238 but receiver should be enough clever f.e. to forward mtrace requests,
239 sent to multicast group to reach destination designated router.
240 */
241struct ip_ra_chain *ip_ra_chain;
66018506
ED		 242static DEFINE_SPINLOCK(ip_ra_lock);
243
592fcb9d
ED		 244
245static void ip_ra_destroy_rcu(struct rcu_head *head)
66018506 246{
592fcb9d
ED		 247 struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu);
248
249 sock_put(ra->saved_sk);
250 kfree(ra);
66018506 251}
1da177e4 252
4d52cfbe
ED		 253int ip_ra_control(struct sock *sk, unsigned char on,
254 void (*destructor)(struct sock *))
1da177e4
LT		 255{
256 struct ip_ra_chain *ra, *new_ra, **rap;
257
c720c7e8 258 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW)
1da177e4
LT		 259 return -EINVAL;
260
261 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
262
66018506 263 spin_lock_bh(&ip_ra_lock);
4d52cfbe 264 for (rap = &ip_ra_chain; (ra = *rap) != NULL; rap = &ra->next) {
1da177e4
LT		 265 if (ra->sk == sk) {
266 if (on) {
66018506 267 spin_unlock_bh(&ip_ra_lock);
a51482bd 268 kfree(new_ra);
1da177e4
LT		 269 return -EADDRINUSE;
270 }
592fcb9d
ED		 271 /* dont let ip_call_ra_chain() use sk again */
272 ra->sk = NULL;
66018506
ED		 273 rcu_assign_pointer(*rap, ra->next);
274 spin_unlock_bh(&ip_ra_lock);
1da177e4
LT		 275
276 if (ra->destructor)
277 ra->destructor(sk);
592fcb9d
ED		 278 /*
279 * Delay sock_put(sk) and kfree(ra) after one rcu grace
280 * period. This guarantee ip_call_ra_chain() dont need
281 * to mess with socket refcounts.
282 */
283 ra->saved_sk = sk;
284 call_rcu(&ra->rcu, ip_ra_destroy_rcu);
1da177e4
LT		 285 return 0;
286 }
287 }
288 if (new_ra == NULL) {
66018506 289 spin_unlock_bh(&ip_ra_lock);
1da177e4
LT		 290 return -ENOBUFS;
291 }
292 new_ra->sk = sk;
293 new_ra->destructor = destructor;
294
295 new_ra->next = ra;
66018506 296 rcu_assign_pointer(*rap, new_ra);
1da177e4 297 sock_hold(sk);
66018506 298 spin_unlock_bh(&ip_ra_lock);
1da177e4
LT		 299
300 return 0;
301}
302
e905a9ed 303void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
35986b32 304 __be16 port, u32 info, u8 *payload)
1da177e4 305{
1da177e4
LT		 306 struct sock_exterr_skb *serr;
307
1da177e4
LT		 308 skb = skb_clone(skb, GFP_ATOMIC);
309 if (!skb)
310 return;
311
e905a9ed 312 serr = SKB_EXT_ERR(skb);
1da177e4
LT		 313 serr->ee.ee_errno = err;
314 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
88c7664f
ACM		 315 serr->ee.ee_type = icmp_hdr(skb)->type;
316 serr->ee.ee_code = icmp_hdr(skb)->code;
1da177e4
LT		 317 serr->ee.ee_pad = 0;
318 serr->ee.ee_info = info;
319 serr->ee.ee_data = 0;
88c7664f 320 serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) -
d56f90a7 321 skb_network_header(skb);
1da177e4
LT		 322 serr->port = port;
323
bd82393c
ACM		 324 if (skb_pull(skb, payload - skb->data) != NULL) {
325 skb_reset_transport_header(skb);
326 if (sock_queue_err_skb(sk, skb) == 0)
327 return;
328 }
329 kfree_skb(skb);
1da177e4
LT		 330}
331
0579016e 332void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info)
1da177e4
LT		 333{
334 struct inet_sock *inet = inet_sk(sk);
335 struct sock_exterr_skb *serr;
336 struct iphdr *iph;
337 struct sk_buff *skb;
338
339 if (!inet->recverr)
340 return;
341
342 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
343 if (!skb)
344 return;
345
2ca9e6f2
ACM		 346 skb_put(skb, sizeof(struct iphdr));
347 skb_reset_network_header(skb);
eddc9ec5 348 iph = ip_hdr(skb);
1da177e4
LT		 349 iph->daddr = daddr;
350
e905a9ed 351 serr = SKB_EXT_ERR(skb);
1da177e4
LT		 352 serr->ee.ee_errno = err;
353 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
e905a9ed 354 serr->ee.ee_type = 0;
1da177e4
LT		 355 serr->ee.ee_code = 0;
356 serr->ee.ee_pad = 0;
357 serr->ee.ee_info = info;
358 serr->ee.ee_data = 0;
d56f90a7 359 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
1da177e4
LT		 360 serr->port = port;
361
27a884dc 362 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
bd82393c 363 skb_reset_transport_header(skb);
1da177e4
LT		 364
365 if (sock_queue_err_skb(sk, skb))
366 kfree_skb(skb);
367}
368
e905a9ed 369/*
1da177e4
LT		 370 * Handle MSG_ERRQUEUE
371 */
372int ip_recv_error(struct sock *sk, struct msghdr *msg, int len)
373{
374 struct sock_exterr_skb *serr;
375 struct sk_buff *skb, *skb2;
376 struct sockaddr_in *sin;
377 struct {
378 struct sock_extended_err ee;
379 struct sockaddr_in offender;
380 } errhdr;
381 int err;
382 int copied;
383
384 err = -EAGAIN;
385 skb = skb_dequeue(&sk->sk_error_queue);
386 if (skb == NULL)
387 goto out;
388
389 copied = skb->len;
390 if (copied > len) {
391 msg->msg_flags |= MSG_TRUNC;
392 copied = len;
393 }
394 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
395 if (err)
396 goto out_free_skb;
397
398 sock_recv_timestamp(msg, sk, skb);
399
400 serr = SKB_EXT_ERR(skb);
401
402 sin = (struct sockaddr_in *)msg->msg_name;
403 if (sin) {
404 sin->sin_family = AF_INET;
d56f90a7
ACM		 405 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) +
406 serr->addr_offset);
1da177e4
LT		 407 sin->sin_port = serr->port;
408 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
409 }
410
411 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
412 sin = &errhdr.offender;
413 sin->sin_family = AF_UNSPEC;
414 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) {
415 struct inet_sock *inet = inet_sk(sk);
416
417 sin->sin_family = AF_INET;
eddc9ec5 418 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
1da177e4
LT		 419 sin->sin_port = 0;
420 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
421 if (inet->cmsg_flags)
422 ip_cmsg_recv(msg, skb);
423 }
424
425 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
426
427 /* Now we could try to dump offended packet options */
428
429 msg->msg_flags |= MSG_ERRQUEUE;
430 err = copied;
431
432 /* Reset and regenerate socket error */
e0f9f858 433 spin_lock_bh(&sk->sk_error_queue.lock);
1da177e4 434 sk->sk_err = 0;
4d52cfbe
ED		 435 skb2 = skb_peek(&sk->sk_error_queue);
436 if (skb2 != NULL) {
1da177e4 437 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
e0f9f858 438 spin_unlock_bh(&sk->sk_error_queue.lock);
1da177e4
LT		 439 sk->sk_error_report(sk);
440 } else
e0f9f858 441 spin_unlock_bh(&sk->sk_error_queue.lock);
1da177e4 442
e905a9ed 443out_free_skb:
1da177e4
LT		 444 kfree_skb(skb);
445out:
446 return err;
447}
448
449
450/*
4d52cfbe
ED		 451 * Socket option code for IP. This is the end of the line after any
452 * TCP,UDP etc options on an IP socket.
1da177e4
LT		 453 */
454
3fdadf7d 455static int do_ip_setsockopt(struct sock *sk, int level,
b7058842 456 int optname, char __user *optval, unsigned int optlen)
1da177e4
LT		 457{
458 struct inet_sock *inet = inet_sk(sk);
09cb105e 459 int val = 0, err;
1da177e4 460
e905a9ed 461 if (((1<<optname) & ((1<<IP_PKTINFO) | (1<<IP_RECVTTL) |
132adf54
SH		 462 (1<<IP_RECVOPTS) | (1<<IP_RECVTOS) |
463 (1<<IP_RETOPTS) | (1<<IP_TOS) |
464 (1<<IP_TTL) | (1<<IP_HDRINCL) |
465 (1<<IP_MTU_DISCOVER) | (1<<IP_RECVERR) |
466 (1<<IP_ROUTER_ALERT) | (1<<IP_FREEBIND) |
d218d111
SH		 467 (1<<IP_PASSSEC) | (1<<IP_TRANSPARENT) |
468 (1<<IP_MINTTL))) ||
132adf54 469 optname == IP_MULTICAST_TTL ||
f771bef9 470 optname == IP_MULTICAST_ALL ||
e8b2dfe9
BS		 471 optname == IP_MULTICAST_LOOP ||
472 optname == IP_RECVORIGDSTADDR) {
1da177e4
LT		 473 if (optlen >= sizeof(int)) {
474 if (get_user(val, (int __user *) optval))
475 return -EFAULT;
476 } else if (optlen >= sizeof(char)) {
477 unsigned char ucval;
478
479 if (get_user(ucval, (unsigned char __user *) optval))
480 return -EFAULT;
481 val = (int) ucval;
482 }
483 }
484
485 /* If optlen==0, it is equivalent to val == 0 */
486
6a9fb947 487 if (ip_mroute_opt(optname))
09cb105e 488 return ip_mroute_setsockopt(sk, optname, optval, optlen);
1da177e4
LT		 489
490 err = 0;
491 lock_sock(sk);
492
493 switch (optname) {
132adf54
SH		 494 case IP_OPTIONS:
495 {
4d52cfbe 496 struct ip_options *opt = NULL;
65a1c4ff 497 if (optlen > 40)
132adf54 498 goto e_inval;
3b1e0a65 499 err = ip_options_get_from_user(sock_net(sk), &opt,
cb84663e 500 optval, optlen);
132adf54
SH		 501 if (err)
502 break;
503 if (inet->is_icsk) {
504 struct inet_connection_sock *icsk = inet_csk(sk);
1da177e4 505#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
132adf54
SH		 506 if (sk->sk_family == PF_INET ||
507 (!((1 << sk->sk_state) &
508 (TCPF_LISTEN | TCPF_CLOSE)) &&
c720c7e8 509 inet->inet_daddr != LOOPBACK4_IPV6)) {
1da177e4 510#endif
132adf54
SH		 511 if (inet->opt)
512 icsk->icsk_ext_hdr_len -= inet->opt->optlen;
513 if (opt)
514 icsk->icsk_ext_hdr_len += opt->optlen;
515 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
1da177e4 516#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1da177e4 517 }
132adf54 518#endif
1da177e4 519 }
132adf54
SH		 520 opt = xchg(&inet->opt, opt);
521 kfree(opt);
522 break;
523 }
524 case IP_PKTINFO:
525 if (val)
526 inet->cmsg_flags |= IP_CMSG_PKTINFO;
527 else
528 inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
529 break;
530 case IP_RECVTTL:
531 if (val)
532 inet->cmsg_flags |= IP_CMSG_TTL;
533 else
534 inet->cmsg_flags &= ~IP_CMSG_TTL;
535 break;
536 case IP_RECVTOS:
537 if (val)
538 inet->cmsg_flags |= IP_CMSG_TOS;
539 else
540 inet->cmsg_flags &= ~IP_CMSG_TOS;
541 break;
542 case IP_RECVOPTS:
543 if (val)
544 inet->cmsg_flags |= IP_CMSG_RECVOPTS;
545 else
546 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
547 break;
548 case IP_RETOPTS:
549 if (val)
550 inet->cmsg_flags |= IP_CMSG_RETOPTS;
551 else
552 inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
553 break;
554 case IP_PASSSEC:
555 if (val)
556 inet->cmsg_flags |= IP_CMSG_PASSSEC;
557 else
558 inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
559 break;
e8b2dfe9
BS		 560 case IP_RECVORIGDSTADDR:
561 if (val)
562 inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR;
563 else
564 inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR;
565 break;
132adf54
SH		 566 case IP_TOS: /* This sets both TOS and Precedence */
567 if (sk->sk_type == SOCK_STREAM) {
568 val &= ~3;
569 val |= inet->tos & 3;
570 }
132adf54
SH		 571 if (inet->tos != val) {
572 inet->tos = val;
573 sk->sk_priority = rt_tos2priority(val);
574 sk_dst_reset(sk);
575 }
576 break;
577 case IP_TTL:
4d52cfbe 578 if (optlen < 1)
132adf54 579 goto e_inval;
4d52cfbe 580 if (val != -1 && (val < 0 || val > 255))
132adf54
SH		 581 goto e_inval;
582 inet->uc_ttl = val;
583 break;
584 case IP_HDRINCL:
585 if (sk->sk_type != SOCK_RAW) {
586 err = -ENOPROTOOPT;
2c7946a7 587 break;
132adf54
SH		 588 }
589 inet->hdrincl = val ? 1 : 0;
590 break;
591 case IP_MTU_DISCOVER:
0eae750e 592 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_PROBE)
132adf54
SH		 593 goto e_inval;
594 inet->pmtudisc = val;
595 break;
596 case IP_RECVERR:
597 inet->recverr = !!val;
598 if (!val)
599 skb_queue_purge(&sk->sk_error_queue);
600 break;
601 case IP_MULTICAST_TTL:
602 if (sk->sk_type == SOCK_STREAM)
603 goto e_inval;
4d52cfbe 604 if (optlen < 1)
132adf54 605 goto e_inval;
09cb105e 606 if (val == -1)
132adf54
SH		 607 val = 1;
608 if (val < 0 || val > 255)
609 goto e_inval;
610 inet->mc_ttl = val;
611 break;
612 case IP_MULTICAST_LOOP:
4d52cfbe 613 if (optlen < 1)
132adf54
SH		 614 goto e_inval;
615 inet->mc_loop = !!val;
616 break;
617 case IP_MULTICAST_IF:
618 {
619 struct ip_mreqn mreq;
620 struct net_device *dev = NULL;
621
622 if (sk->sk_type == SOCK_STREAM)
623 goto e_inval;
624 /*
625 * Check the arguments are allowable
626 */
627
0915921b
SW		 628 if (optlen < sizeof(struct in_addr))
629 goto e_inval;
630
132adf54
SH		 631 err = -EFAULT;
632 if (optlen >= sizeof(struct ip_mreqn)) {
09cb105e 633 if (copy_from_user(&mreq, optval, sizeof(mreq)))
1da177e4 634 break;
132adf54
SH		 635 } else {
636 memset(&mreq, 0, sizeof(mreq));
637 if (optlen >= sizeof(struct in_addr) &&
4d52cfbe
ED		 638 copy_from_user(&mreq.imr_address, optval,
639 sizeof(struct in_addr)))
132adf54
SH		 640 break;
641 }
642
643 if (!mreq.imr_ifindex) {
e6f1cebf 644 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) {
132adf54
SH		 645 inet->mc_index = 0;
646 inet->mc_addr = 0;
647 err = 0;
1da177e4
LT		 648 break;
649 }
3b1e0a65 650 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr);
55b80503 651 if (dev)
132adf54 652 mreq.imr_ifindex = dev->ifindex;
132adf54 653 } else
55b80503 654 dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex);
1da177e4 655
1da177e4 656
132adf54
SH		 657 err = -EADDRNOTAVAIL;
658 if (!dev)
659 break;
55b80503 660 dev_put(dev);
132adf54
SH		 661
662 err = -EINVAL;
663 if (sk->sk_bound_dev_if &&
664 mreq.imr_ifindex != sk->sk_bound_dev_if)
665 break;
1da177e4 666
132adf54
SH		 667 inet->mc_index = mreq.imr_ifindex;
668 inet->mc_addr = mreq.imr_address.s_addr;
669 err = 0;
670 break;
671 }
1da177e4 672
132adf54
SH		 673 case IP_ADD_MEMBERSHIP:
674 case IP_DROP_MEMBERSHIP:
675 {
676 struct ip_mreqn mreq;
1da177e4 677
a96fb49b
FL		 678 err = -EPROTO;
679 if (inet_sk(sk)->is_icsk)
680 break;
681
132adf54
SH		 682 if (optlen < sizeof(struct ip_mreq))
683 goto e_inval;
684 err = -EFAULT;
685 if (optlen >= sizeof(struct ip_mreqn)) {
09cb105e 686 if (copy_from_user(&mreq, optval, sizeof(mreq)))
1da177e4 687 break;
132adf54
SH		 688 } else {
689 memset(&mreq, 0, sizeof(mreq));
09cb105e 690 if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq)))
1da177e4 691 break;
132adf54 692 }
1da177e4 693
132adf54
SH		 694 if (optname == IP_ADD_MEMBERSHIP)
695 err = ip_mc_join_group(sk, &mreq);
696 else
697 err = ip_mc_leave_group(sk, &mreq);
698 break;
699 }
700 case IP_MSFILTER:
701 {
132adf54
SH		 702 struct ip_msfilter *msf;
703
704 if (optlen < IP_MSFILTER_SIZE(0))
705 goto e_inval;
706 if (optlen > sysctl_optmem_max) {
707 err = -ENOBUFS;
1da177e4
LT		 708 break;
709 }
132adf54 710 msf = kmalloc(optlen, GFP_KERNEL);
cfcabdcc 711 if (!msf) {
132adf54
SH		 712 err = -ENOBUFS;
713 break;
714 }
715 err = -EFAULT;
716 if (copy_from_user(msf, optval, optlen)) {
717 kfree(msf);
718 break;
719 }
720 /* numsrc >= (1G-4) overflow in 32 bits */
721 if (msf->imsf_numsrc >= 0x3ffffffcU ||
722 msf->imsf_numsrc > sysctl_igmp_max_msf) {
723 kfree(msf);
724 err = -ENOBUFS;
725 break;
726 }
727 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
728 kfree(msf);
729 err = -EINVAL;
730 break;
731 }
732 err = ip_mc_msfilter(sk, msf, 0);
733 kfree(msf);
734 break;
735 }
736 case IP_BLOCK_SOURCE:
737 case IP_UNBLOCK_SOURCE:
738 case IP_ADD_SOURCE_MEMBERSHIP:
739 case IP_DROP_SOURCE_MEMBERSHIP:
740 {
741 struct ip_mreq_source mreqs;
742 int omode, add;
1da177e4 743
132adf54
SH		 744 if (optlen != sizeof(struct ip_mreq_source))
745 goto e_inval;
746 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
1da177e4 747 err = -EFAULT;
1da177e4
LT		 748 break;
749 }
132adf54
SH		 750 if (optname == IP_BLOCK_SOURCE) {
751 omode = MCAST_EXCLUDE;
752 add = 1;
753 } else if (optname == IP_UNBLOCK_SOURCE) {
754 omode = MCAST_EXCLUDE;
755 add = 0;
756 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
757 struct ip_mreqn mreq;
1da177e4 758
132adf54
SH		 759 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
760 mreq.imr_address.s_addr = mreqs.imr_interface;
761 mreq.imr_ifindex = 0;
762 err = ip_mc_join_group(sk, &mreq);
763 if (err && err != -EADDRINUSE)
1da177e4 764 break;
132adf54
SH		 765 omode = MCAST_INCLUDE;
766 add = 1;
767 } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
768 omode = MCAST_INCLUDE;
769 add = 0;
770 }
771 err = ip_mc_source(add, omode, sk, &mreqs, 0);
772 break;
773 }
774 case MCAST_JOIN_GROUP:
775 case MCAST_LEAVE_GROUP:
776 {
777 struct group_req greq;
778 struct sockaddr_in *psin;
779 struct ip_mreqn mreq;
780
781 if (optlen < sizeof(struct group_req))
782 goto e_inval;
783 err = -EFAULT;
784 if (copy_from_user(&greq, optval, sizeof(greq)))
785 break;
786 psin = (struct sockaddr_in *)&greq.gr_group;
787 if (psin->sin_family != AF_INET)
788 goto e_inval;
789 memset(&mreq, 0, sizeof(mreq));
790 mreq.imr_multiaddr = psin->sin_addr;
791 mreq.imr_ifindex = greq.gr_interface;
792
793 if (optname == MCAST_JOIN_GROUP)
794 err = ip_mc_join_group(sk, &mreq);
795 else
796 err = ip_mc_leave_group(sk, &mreq);
797 break;
798 }
799 case MCAST_JOIN_SOURCE_GROUP:
800 case MCAST_LEAVE_SOURCE_GROUP:
801 case MCAST_BLOCK_SOURCE:
802 case MCAST_UNBLOCK_SOURCE:
803 {
804 struct group_source_req greqs;
805 struct ip_mreq_source mreqs;
806 struct sockaddr_in *psin;
807 int omode, add;
808
809 if (optlen != sizeof(struct group_source_req))
810 goto e_inval;
811 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
1da177e4 812 err = -EFAULT;
1da177e4
LT		 813 break;
814 }
132adf54
SH		 815 if (greqs.gsr_group.ss_family != AF_INET ||
816 greqs.gsr_source.ss_family != AF_INET) {
817 err = -EADDRNOTAVAIL;
1da177e4
LT		 818 break;
819 }
132adf54
SH		 820 psin = (struct sockaddr_in *)&greqs.gsr_group;
821 mreqs.imr_multiaddr = psin->sin_addr.s_addr;
822 psin = (struct sockaddr_in *)&greqs.gsr_source;
823 mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
824 mreqs.imr_interface = 0; /* use index for mc_source */
825
826 if (optname == MCAST_BLOCK_SOURCE) {
827 omode = MCAST_EXCLUDE;
828 add = 1;
829 } else if (optname == MCAST_UNBLOCK_SOURCE) {
830 omode = MCAST_EXCLUDE;
831 add = 0;
832 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
1da177e4
LT		 833 struct ip_mreqn mreq;
834
132adf54 835 psin = (struct sockaddr_in *)&greqs.gsr_group;
1da177e4 836 mreq.imr_multiaddr = psin->sin_addr;
132adf54
SH		 837 mreq.imr_address.s_addr = 0;
838 mreq.imr_ifindex = greqs.gsr_interface;
839 err = ip_mc_join_group(sk, &mreq);
840 if (err && err != -EADDRINUSE)
841 break;
842 greqs.gsr_interface = mreq.imr_ifindex;
843 omode = MCAST_INCLUDE;
844 add = 1;
845 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
846 omode = MCAST_INCLUDE;
847 add = 0;
848 }
849 err = ip_mc_source(add, omode, sk, &mreqs,
850 greqs.gsr_interface);
851 break;
852 }
853 case MCAST_MSFILTER:
854 {
132adf54
SH		 855 struct sockaddr_in *psin;
856 struct ip_msfilter *msf = NULL;
857 struct group_filter *gsf = NULL;
858 int msize, i, ifindex;
859
860 if (optlen < GROUP_FILTER_SIZE(0))
861 goto e_inval;
862 if (optlen > sysctl_optmem_max) {
863 err = -ENOBUFS;
1da177e4
LT		 864 break;
865 }
09cb105e 866 gsf = kmalloc(optlen, GFP_KERNEL);
cfcabdcc 867 if (!gsf) {
132adf54 868 err = -ENOBUFS;
1da177e4
LT		 869 break;
870 }
132adf54 871 err = -EFAULT;
4d52cfbe 872 if (copy_from_user(gsf, optval, optlen))
132adf54 873 goto mc_msf_out;
4d52cfbe 874
132adf54
SH		 875 /* numsrc >= (4G-140)/128 overflow in 32 bits */
876 if (gsf->gf_numsrc >= 0x1ffffff ||
877 gsf->gf_numsrc > sysctl_igmp_max_msf) {
878 err = -ENOBUFS;
879 goto mc_msf_out;
880 }
881 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
882 err = -EINVAL;
883 goto mc_msf_out;
884 }
885 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
09cb105e 886 msf = kmalloc(msize, GFP_KERNEL);
cfcabdcc 887 if (!msf) {
132adf54
SH		 888 err = -ENOBUFS;
889 goto mc_msf_out;
890 }
891 ifindex = gsf->gf_interface;
892 psin = (struct sockaddr_in *)&gsf->gf_group;
893 if (psin->sin_family != AF_INET) {
1da177e4 894 err = -EADDRNOTAVAIL;
132adf54 895 goto mc_msf_out;
1da177e4 896 }
132adf54
SH		 897 msf->imsf_multiaddr = psin->sin_addr.s_addr;
898 msf->imsf_interface = 0;
899 msf->imsf_fmode = gsf->gf_fmode;
900 msf->imsf_numsrc = gsf->gf_numsrc;
901 err = -EADDRNOTAVAIL;
4d52cfbe 902 for (i = 0; i < gsf->gf_numsrc; ++i) {
132adf54 903 psin = (struct sockaddr_in *)&gsf->gf_slist[i];
e905a9ed 904
132adf54
SH		 905 if (psin->sin_family != AF_INET)
906 goto mc_msf_out;
907 msf->imsf_slist[i] = psin->sin_addr.s_addr;
908 }
909 kfree(gsf);
910 gsf = NULL;
911
912 err = ip_mc_msfilter(sk, msf, ifindex);
4d52cfbe 913mc_msf_out:
132adf54
SH		 914 kfree(msf);
915 kfree(gsf);
916 break;
917 }
f771bef9
NS		 918 case IP_MULTICAST_ALL:
919 if (optlen < 1)
920 goto e_inval;
921 if (val != 0 && val != 1)
922 goto e_inval;
923 inet->mc_all = val;
924 break;
132adf54
SH		 925 case IP_ROUTER_ALERT:
926 err = ip_ra_control(sk, val ? 1 : 0, NULL);
927 break;
928
929 case IP_FREEBIND:
4d52cfbe 930 if (optlen < 1)
132adf54
SH		 931 goto e_inval;
932 inet->freebind = !!val;
933 break;
934
935 case IP_IPSEC_POLICY:
936 case IP_XFRM_POLICY:
937 err = -EPERM;
938 if (!capable(CAP_NET_ADMIN))
1da177e4 939 break;
132adf54
SH		 940 err = xfrm_user_policy(sk, optname, optval, optlen);
941 break;
1da177e4 942
f5715aea
KK		 943 case IP_TRANSPARENT:
944 if (!capable(CAP_NET_ADMIN)) {
945 err = -EPERM;
946 break;
947 }
948 if (optlen < 1)
949 goto e_inval;
950 inet->transparent = !!val;
951 break;
952
d218d111
SH		 953 case IP_MINTTL:
954 if (optlen < 1)
955 goto e_inval;
956 if (val < 0 || val > 255)
957 goto e_inval;
958 inet->min_ttl = val;
959 break;
960
132adf54
SH		 961 default:
962 err = -ENOPROTOOPT;
963 break;
1da177e4
LT		 964 }
965 release_sock(sk);
966 return err;
967
968e_inval:
969 release_sock(sk);
970 return -EINVAL;
971}
972
f84af32c
ED		 973/**
974 * ip_queue_rcv_skb - Queue an skb into sock receive queue
975 * @sk: socket
976 * @skb: buffer
977 *
978 * Queues an skb into socket receive queue. If IP_CMSG_PKTINFO option
979 * is not set, we drop skb dst entry now, while dst cache line is hot.
980 */
981int ip_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
982{
983 if (!(inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO))
984 skb_dst_drop(skb);
985 return sock_queue_rcv_skb(sk, skb);
986}
987EXPORT_SYMBOL(ip_queue_rcv_skb);
988
3fdadf7d 989int ip_setsockopt(struct sock *sk, int level,
b7058842 990 int optname, char __user *optval, unsigned int optlen)
3fdadf7d
DM		 991{
992 int err;
993
994 if (level != SOL_IP)
995 return -ENOPROTOOPT;
996
997 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
998#ifdef CONFIG_NETFILTER
999 /* we need to exclude all possible ENOPROTOOPTs except default case */
1000 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
6a9fb947
PE		 1001 optname != IP_IPSEC_POLICY &&
1002 optname != IP_XFRM_POLICY &&
1003 !ip_mroute_opt(optname)) {
3fdadf7d
DM		 1004 lock_sock(sk);
1005 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
1006 release_sock(sk);
1007 }
1008#endif
1009 return err;
1010}
4d52cfbe 1011EXPORT_SYMBOL(ip_setsockopt);
3fdadf7d
DM		 1012
1013#ifdef CONFIG_COMPAT
543d9cfe 1014int compat_ip_setsockopt(struct sock *sk, int level, int optname,
b7058842 1015 char __user *optval, unsigned int optlen)
3fdadf7d
DM		 1016{
1017 int err;
1018
1019 if (level != SOL_IP)
1020 return -ENOPROTOOPT;
1021
dae50295
DS		 1022 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
1023 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
1024 ip_setsockopt);
1025
3fdadf7d
DM		 1026 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1027#ifdef CONFIG_NETFILTER
1028 /* we need to exclude all possible ENOPROTOOPTs except default case */
1029 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
6a9fb947
PE		 1030 optname != IP_IPSEC_POLICY &&
1031 optname != IP_XFRM_POLICY &&
1032 !ip_mroute_opt(optname)) {
3fdadf7d 1033 lock_sock(sk);
543d9cfe
ACM		 1034 err = compat_nf_setsockopt(sk, PF_INET, optname,
1035 optval, optlen);
3fdadf7d
DM		 1036 release_sock(sk);
1037 }
1038#endif
1039 return err;
1040}
543d9cfe 1041EXPORT_SYMBOL(compat_ip_setsockopt);
3fdadf7d
DM		 1042#endif
1043
1da177e4 1044/*
4d52cfbe
ED		 1045 * Get the options. Note for future reference. The GET of IP options gets
1046 * the _received_ ones. The set sets the _sent_ ones.
1da177e4
LT		 1047 */
1048
3fdadf7d 1049static int do_ip_getsockopt(struct sock *sk, int level, int optname,
132adf54 1050 char __user *optval, int __user *optlen)
1da177e4
LT		 1051{
1052 struct inet_sock *inet = inet_sk(sk);
1053 int val;
1054 int len;
e905a9ed 1055
132adf54 1056 if (level != SOL_IP)
1da177e4
LT		 1057 return -EOPNOTSUPP;
1058
6a9fb947 1059 if (ip_mroute_opt(optname))
09cb105e 1060 return ip_mroute_getsockopt(sk, optname, optval, optlen);
1da177e4 1061
09cb105e 1062 if (get_user(len, optlen))
1da177e4 1063 return -EFAULT;
132adf54 1064 if (len < 0)
1da177e4 1065 return -EINVAL;
e905a9ed 1066
1da177e4
LT		 1067 lock_sock(sk);
1068
132adf54
SH		 1069 switch (optname) {
1070 case IP_OPTIONS:
1071 {
1072 unsigned char optbuf[sizeof(struct ip_options)+40];
09cb105e 1073 struct ip_options * opt = (struct ip_options *)optbuf;
132adf54
SH		 1074 opt->optlen = 0;
1075 if (inet->opt)
1076 memcpy(optbuf, inet->opt,
1077 sizeof(struct ip_options)+
1078 inet->opt->optlen);
1079 release_sock(sk);
1080
1081 if (opt->optlen == 0)
1082 return put_user(0, optlen);
1083
1084 ip_options_undo(opt);
1085
1086 len = min_t(unsigned int, len, opt->optlen);
1087 if (put_user(len, optlen))
1088 return -EFAULT;
1089 if (copy_to_user(optval, opt->__data, len))
1090 return -EFAULT;
1091 return 0;
1092 }
1093 case IP_PKTINFO:
1094 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
1095 break;
1096 case IP_RECVTTL:
1097 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
1098 break;
1099 case IP_RECVTOS:
1100 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
1101 break;
1102 case IP_RECVOPTS:
1103 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
1104 break;
1105 case IP_RETOPTS:
1106 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
1107 break;
1108 case IP_PASSSEC:
1109 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
1110 break;
e8b2dfe9
BS		 1111 case IP_RECVORIGDSTADDR:
1112 val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0;
1113 break;
132adf54
SH		 1114 case IP_TOS:
1115 val = inet->tos;
1116 break;
1117 case IP_TTL:
1118 val = (inet->uc_ttl == -1 ?
1119 sysctl_ip_default_ttl :
1120 inet->uc_ttl);
1121 break;
1122 case IP_HDRINCL:
1123 val = inet->hdrincl;
1124 break;
1125 case IP_MTU_DISCOVER:
1126 val = inet->pmtudisc;
1127 break;
1128 case IP_MTU:
1129 {
1130 struct dst_entry *dst;
1131 val = 0;
1132 dst = sk_dst_get(sk);
1133 if (dst) {
1134 val = dst_mtu(dst);
1135 dst_release(dst);
1da177e4 1136 }
132adf54 1137 if (!val) {
1da177e4 1138 release_sock(sk);
132adf54 1139 return -ENOTCONN;
1da177e4 1140 }
132adf54
SH		 1141 break;
1142 }
1143 case IP_RECVERR:
1144 val = inet->recverr;
1145 break;
1146 case IP_MULTICAST_TTL:
1147 val = inet->mc_ttl;
1148 break;
1149 case IP_MULTICAST_LOOP:
1150 val = inet->mc_loop;
1151 break;
1152 case IP_MULTICAST_IF:
1153 {
1154 struct in_addr addr;
1155 len = min_t(unsigned int, len, sizeof(struct in_addr));
1156 addr.s_addr = inet->mc_addr;
1157 release_sock(sk);
1da177e4 1158
132adf54
SH		 1159 if (put_user(len, optlen))
1160 return -EFAULT;
1161 if (copy_to_user(optval, &addr, len))
1162 return -EFAULT;
1163 return 0;
1164 }
1165 case IP_MSFILTER:
1166 {
1167 struct ip_msfilter msf;
1168 int err;
1169
1170 if (len < IP_MSFILTER_SIZE(0)) {
1da177e4 1171 release_sock(sk);
132adf54 1172 return -EINVAL;
1da177e4 1173 }
132adf54 1174 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
1da177e4 1175 release_sock(sk);
132adf54 1176 return -EFAULT;
1da177e4 1177 }
132adf54
SH		 1178 err = ip_mc_msfget(sk, &msf,
1179 (struct ip_msfilter __user *)optval, optlen);
1180 release_sock(sk);
1181 return err;
1182 }
1183 case MCAST_MSFILTER:
1184 {
1185 struct group_filter gsf;
1186 int err;
1da177e4 1187
132adf54 1188 if (len < GROUP_FILTER_SIZE(0)) {
1da177e4 1189 release_sock(sk);
132adf54
SH		 1190 return -EINVAL;
1191 }
1192 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
1193 release_sock(sk);
1194 return -EFAULT;
1195 }
1196 err = ip_mc_gsfget(sk, &gsf,
4d52cfbe
ED		 1197 (struct group_filter __user *)optval,
1198 optlen);
132adf54
SH		 1199 release_sock(sk);
1200 return err;
1201 }
f771bef9
NS		 1202 case IP_MULTICAST_ALL:
1203 val = inet->mc_all;
1204 break;
132adf54
SH		 1205 case IP_PKTOPTIONS:
1206 {
1207 struct msghdr msg;
1da177e4 1208
132adf54 1209 release_sock(sk);
1da177e4 1210
132adf54
SH		 1211 if (sk->sk_type != SOCK_STREAM)
1212 return -ENOPROTOOPT;
1da177e4 1213
132adf54
SH		 1214 msg.msg_control = optval;
1215 msg.msg_controllen = len;
1216 msg.msg_flags = 0;
1da177e4 1217
132adf54
SH		 1218 if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
1219 struct in_pktinfo info;
1220
c720c7e8
ED		 1221 info.ipi_addr.s_addr = inet->inet_rcv_saddr;
1222 info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr;
132adf54
SH		 1223 info.ipi_ifindex = inet->mc_index;
1224 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
1da177e4 1225 }
132adf54
SH		 1226 if (inet->cmsg_flags & IP_CMSG_TTL) {
1227 int hlim = inet->mc_ttl;
1228 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
1229 }
1230 len -= msg.msg_controllen;
1231 return put_user(len, optlen);
1232 }
1233 case IP_FREEBIND:
1234 val = inet->freebind;
1235 break;
f5715aea
KK		 1236 case IP_TRANSPARENT:
1237 val = inet->transparent;
1238 break;
d218d111
SH		 1239 case IP_MINTTL:
1240 val = inet->min_ttl;
1241 break;
132adf54
SH		 1242 default:
1243 release_sock(sk);
1244 return -ENOPROTOOPT;
1da177e4
LT		 1245 }
1246 release_sock(sk);
e905a9ed 1247
4d52cfbe 1248 if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) {
1da177e4
LT		 1249 unsigned char ucval = (unsigned char)val;
1250 len = 1;
132adf54 1251 if (put_user(len, optlen))
1da177e4 1252 return -EFAULT;
09cb105e 1253 if (copy_to_user(optval, &ucval, 1))
1da177e4
LT		 1254 return -EFAULT;
1255 } else {
1256 len = min_t(unsigned int, sizeof(int), len);
132adf54 1257 if (put_user(len, optlen))
1da177e4 1258 return -EFAULT;
09cb105e 1259 if (copy_to_user(optval, &val, len))
1da177e4
LT		 1260 return -EFAULT;
1261 }
1262 return 0;
1263}
1264
3fdadf7d 1265int ip_getsockopt(struct sock *sk, int level,
132adf54 1266 int optname, char __user *optval, int __user *optlen)
3fdadf7d
DM		 1267{
1268 int err;
1269
1270 err = do_ip_getsockopt(sk, level, optname, optval, optlen);
1271#ifdef CONFIG_NETFILTER
1272 /* we need to exclude all possible ENOPROTOOPTs except default case */
6a9fb947
PE		 1273 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1274 !ip_mroute_opt(optname)) {
e905a9ed 1275 int len;
3fdadf7d 1276
09cb105e 1277 if (get_user(len, optlen))
3fdadf7d
DM		 1278 return -EFAULT;
1279
1280 lock_sock(sk);
1281 err = nf_getsockopt(sk, PF_INET, optname, optval,
1282 &len);
1283 release_sock(sk);
1284 if (err >= 0)
1285 err = put_user(len, optlen);
1286 return err;
1287 }
1288#endif
1289 return err;
1290}
4d52cfbe 1291EXPORT_SYMBOL(ip_getsockopt);
3fdadf7d
DM		 1292
1293#ifdef CONFIG_COMPAT
543d9cfe
ACM		 1294int compat_ip_getsockopt(struct sock *sk, int level, int optname,
1295 char __user *optval, int __user *optlen)
3fdadf7d 1296{
42908c69
DS		 1297 int err;
1298
1299 if (optname == MCAST_MSFILTER)
1300 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1301 ip_getsockopt);
1302
1303 err = do_ip_getsockopt(sk, level, optname, optval, optlen);
1304
3fdadf7d
DM		 1305#ifdef CONFIG_NETFILTER
1306 /* we need to exclude all possible ENOPROTOOPTs except default case */
6a9fb947
PE		 1307 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1308 !ip_mroute_opt(optname)) {
e905a9ed 1309 int len;
3fdadf7d 1310
543d9cfe 1311 if (get_user(len, optlen))
3fdadf7d
DM		 1312 return -EFAULT;
1313
1314 lock_sock(sk);
543d9cfe 1315 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
3fdadf7d
DM		 1316 release_sock(sk);
1317 if (err >= 0)
1318 err = put_user(len, optlen);
1319 return err;
1320 }
1321#endif
1322 return err;
1323}
543d9cfe 1324EXPORT_SYMBOL(compat_ip_getsockopt);
3fdadf7d 1325#endif
kernel source for telekom puls (alcatel/mediatek)