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ipv4: reduce percpu needs for icmpmsg mibs
[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>
2c67e9ac 36#include <net/inet_ecn.h>
1da177e4
LT		 37#include <net/route.h>
38#include <net/xfrm.h>
dae50295 39#include <net/compat.h>
1da177e4
LT		 40#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
41#include <net/transp_v6.h>
42#endif
43
44#include <linux/errqueue.h>
45#include <asm/uaccess.h>
46
47#define IP_CMSG_PKTINFO 1
48#define IP_CMSG_TTL 2
49#define IP_CMSG_TOS 4
50#define IP_CMSG_RECVOPTS 8
51#define IP_CMSG_RETOPTS 16
2c7946a7 52#define IP_CMSG_PASSSEC 32
e8b2dfe9 53#define IP_CMSG_ORIGDSTADDR 64
1da177e4
LT		 54
55/*
56 * SOL_IP control messages.
57 */
58
59static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb)
60{
61 struct in_pktinfo info;
511c3f92 62 struct rtable *rt = skb_rtable(skb);
1da177e4 63
eddc9ec5 64 info.ipi_addr.s_addr = ip_hdr(skb)->daddr;
1da177e4
LT		 65 if (rt) {
66 info.ipi_ifindex = rt->rt_iif;
67 info.ipi_spec_dst.s_addr = rt->rt_spec_dst;
68 } else {
69 info.ipi_ifindex = 0;
70 info.ipi_spec_dst.s_addr = 0;
71 }
72
73 put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
74}
75
76static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb)
77{
eddc9ec5 78 int ttl = ip_hdr(skb)->ttl;
1da177e4
LT		 79 put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl);
80}
81
82static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb)
83{
eddc9ec5 84 put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos);
1da177e4
LT		 85}
86
87static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb)
88{
89 if (IPCB(skb)->opt.optlen == 0)
90 return;
91
eddc9ec5
ACM		 92 put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen,
93 ip_hdr(skb) + 1);
1da177e4
LT		 94}
95
96
97static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb)
98{
99 unsigned char optbuf[sizeof(struct ip_options) + 40];
09cb105e 100 struct ip_options * opt = (struct ip_options *)optbuf;
1da177e4
LT		 101
102 if (IPCB(skb)->opt.optlen == 0)
103 return;
104
105 if (ip_options_echo(opt, skb)) {
106 msg->msg_flags |= MSG_CTRUNC;
107 return;
108 }
109 ip_options_undo(opt);
110
111 put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data);
112}
113
2c7946a7
CZ		 114static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
115{
116 char *secdata;
dc49c1f9 117 u32 seclen, secid;
2c7946a7
CZ		 118 int err;
119
dc49c1f9
CZ		 120 err = security_socket_getpeersec_dgram(NULL, skb, &secid);
121 if (err)
122 return;
123
124 err = security_secid_to_secctx(secid, &secdata, &seclen);
2c7946a7
CZ		 125 if (err)
126 return;
127
128 put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata);
dc49c1f9 129 security_release_secctx(secdata, seclen);
2c7946a7
CZ		 130}
131
21d1a161 132static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb)
e8b2dfe9
BS		 133{
134 struct sockaddr_in sin;
b71d1d42 135 const struct iphdr *iph = ip_hdr(skb);
21d1a161 136 __be16 *ports = (__be16 *)skb_transport_header(skb);
e8b2dfe9
BS		 137
138 if (skb_transport_offset(skb) + 4 > skb->len)
139 return;
140
141 /* All current transport protocols have the port numbers in the
142 * first four bytes of the transport header and this function is
143 * written with this assumption in mind.
144 */
145
146 sin.sin_family = AF_INET;
147 sin.sin_addr.s_addr = iph->daddr;
148 sin.sin_port = ports[1];
149 memset(sin.sin_zero, 0, sizeof(sin.sin_zero));
150
151 put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin);
152}
1da177e4
LT		 153
154void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
155{
156 struct inet_sock *inet = inet_sk(skb->sk);
157 unsigned flags = inet->cmsg_flags;
158
159 /* Ordered by supposed usage frequency */
160 if (flags & 1)
161 ip_cmsg_recv_pktinfo(msg, skb);
4d52cfbe 162 if ((flags >>= 1) == 0)
1da177e4
LT		 163 return;
164
165 if (flags & 1)
166 ip_cmsg_recv_ttl(msg, skb);
4d52cfbe 167 if ((flags >>= 1) == 0)
1da177e4
LT		 168 return;
169
170 if (flags & 1)
171 ip_cmsg_recv_tos(msg, skb);
4d52cfbe 172 if ((flags >>= 1) == 0)
1da177e4
LT		 173 return;
174
175 if (flags & 1)
176 ip_cmsg_recv_opts(msg, skb);
4d52cfbe 177 if ((flags >>= 1) == 0)
1da177e4
LT		 178 return;
179
180 if (flags & 1)
181 ip_cmsg_recv_retopts(msg, skb);
4d52cfbe 182 if ((flags >>= 1) == 0)
2c7946a7
CZ		 183 return;
184
185 if (flags & 1)
186 ip_cmsg_recv_security(msg, skb);
e8b2dfe9 187
4d52cfbe 188 if ((flags >>= 1) == 0)
e8b2dfe9
BS		 189 return;
190 if (flags & 1)
191 ip_cmsg_recv_dstaddr(msg, skb);
192
1da177e4 193}
4d52cfbe 194EXPORT_SYMBOL(ip_cmsg_recv);
1da177e4 195
7a6adb92 196int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc)
1da177e4
LT		 197{
198 int err;
199 struct cmsghdr *cmsg;
200
201 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
202 if (!CMSG_OK(msg, cmsg))
203 return -EINVAL;
204 if (cmsg->cmsg_level != SOL_IP)
205 continue;
206 switch (cmsg->cmsg_type) {
207 case IP_RETOPTS:
208 err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
4d52cfbe
ED		 209 err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg),
210 err < 40 ? err : 40);
1da177e4
LT		 211 if (err)
212 return err;
213 break;
214 case IP_PKTINFO:
215 {
216 struct in_pktinfo *info;
217 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
218 return -EINVAL;
219 info = (struct in_pktinfo *)CMSG_DATA(cmsg);
220 ipc->oif = info->ipi_ifindex;
221 ipc->addr = info->ipi_spec_dst.s_addr;
222 break;
223 }
224 default:
225 return -EINVAL;
226 }
227 }
228 return 0;
229}
230
231
232/* Special input handler for packets caught by router alert option.
233 They are selected only by protocol field, and then processed likely
234 local ones; but only if someone wants them! Otherwise, router
235 not running rsvpd will kill RSVP.
236
237 It is user level problem, what it will make with them.
238 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
239 but receiver should be enough clever f.e. to forward mtrace requests,
240 sent to multicast group to reach destination designated router.
241 */
43a951e9 242struct ip_ra_chain __rcu *ip_ra_chain;
66018506
ED		 243static DEFINE_SPINLOCK(ip_ra_lock);
244
592fcb9d
ED		 245
246static void ip_ra_destroy_rcu(struct rcu_head *head)
66018506 247{
592fcb9d
ED		 248 struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu);
249
250 sock_put(ra->saved_sk);
251 kfree(ra);
66018506 252}
1da177e4 253
4d52cfbe
ED		 254int ip_ra_control(struct sock *sk, unsigned char on,
255 void (*destructor)(struct sock *))
1da177e4 256{
43a951e9
ED		 257 struct ip_ra_chain *ra, *new_ra;
258 struct ip_ra_chain __rcu **rap;
1da177e4 259
c720c7e8 260 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW)
1da177e4
LT		 261 return -EINVAL;
262
263 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
264
66018506 265 spin_lock_bh(&ip_ra_lock);
43a951e9
ED		 266 for (rap = &ip_ra_chain;
267 (ra = rcu_dereference_protected(*rap,
268 lockdep_is_held(&ip_ra_lock))) != NULL;
269 rap = &ra->next) {
1da177e4
LT		 270 if (ra->sk == sk) {
271 if (on) {
66018506 272 spin_unlock_bh(&ip_ra_lock);
a51482bd 273 kfree(new_ra);
1da177e4
LT		 274 return -EADDRINUSE;
275 }
592fcb9d
ED		 276 /* dont let ip_call_ra_chain() use sk again */
277 ra->sk = NULL;
66018506
ED		 278 rcu_assign_pointer(*rap, ra->next);
279 spin_unlock_bh(&ip_ra_lock);
1da177e4
LT		 280
281 if (ra->destructor)
282 ra->destructor(sk);
592fcb9d
ED		 283 /*
284 * Delay sock_put(sk) and kfree(ra) after one rcu grace
285 * period. This guarantee ip_call_ra_chain() dont need
286 * to mess with socket refcounts.
287 */
288 ra->saved_sk = sk;
289 call_rcu(&ra->rcu, ip_ra_destroy_rcu);
1da177e4
LT		 290 return 0;
291 }
292 }
293 if (new_ra == NULL) {
66018506 294 spin_unlock_bh(&ip_ra_lock);
1da177e4
LT		 295 return -ENOBUFS;
296 }
297 new_ra->sk = sk;
298 new_ra->destructor = destructor;
299
300 new_ra->next = ra;
66018506 301 rcu_assign_pointer(*rap, new_ra);
1da177e4 302 sock_hold(sk);
66018506 303 spin_unlock_bh(&ip_ra_lock);
1da177e4
LT		 304
305 return 0;
306}
307
e905a9ed 308void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
35986b32 309 __be16 port, u32 info, u8 *payload)
1da177e4 310{
1da177e4
LT		 311 struct sock_exterr_skb *serr;
312
1da177e4
LT		 313 skb = skb_clone(skb, GFP_ATOMIC);
314 if (!skb)
315 return;
316
e905a9ed 317 serr = SKB_EXT_ERR(skb);
1da177e4
LT		 318 serr->ee.ee_errno = err;
319 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
88c7664f
ACM		 320 serr->ee.ee_type = icmp_hdr(skb)->type;
321 serr->ee.ee_code = icmp_hdr(skb)->code;
1da177e4
LT		 322 serr->ee.ee_pad = 0;
323 serr->ee.ee_info = info;
324 serr->ee.ee_data = 0;
88c7664f 325 serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) -
d56f90a7 326 skb_network_header(skb);
1da177e4
LT		 327 serr->port = port;
328
bd82393c
ACM		 329 if (skb_pull(skb, payload - skb->data) != NULL) {
330 skb_reset_transport_header(skb);
331 if (sock_queue_err_skb(sk, skb) == 0)
332 return;
333 }
334 kfree_skb(skb);
1da177e4
LT		 335}
336
0579016e 337void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info)
1da177e4
LT		 338{
339 struct inet_sock *inet = inet_sk(sk);
340 struct sock_exterr_skb *serr;
341 struct iphdr *iph;
342 struct sk_buff *skb;
343
344 if (!inet->recverr)
345 return;
346
347 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
348 if (!skb)
349 return;
350
2ca9e6f2
ACM		 351 skb_put(skb, sizeof(struct iphdr));
352 skb_reset_network_header(skb);
eddc9ec5 353 iph = ip_hdr(skb);
1da177e4
LT		 354 iph->daddr = daddr;
355
e905a9ed 356 serr = SKB_EXT_ERR(skb);
1da177e4
LT		 357 serr->ee.ee_errno = err;
358 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
e905a9ed 359 serr->ee.ee_type = 0;
1da177e4
LT		 360 serr->ee.ee_code = 0;
361 serr->ee.ee_pad = 0;
362 serr->ee.ee_info = info;
363 serr->ee.ee_data = 0;
d56f90a7 364 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
1da177e4
LT		 365 serr->port = port;
366
27a884dc 367 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
bd82393c 368 skb_reset_transport_header(skb);
1da177e4
LT		 369
370 if (sock_queue_err_skb(sk, skb))
371 kfree_skb(skb);
372}
373
e905a9ed 374/*
1da177e4
LT		 375 * Handle MSG_ERRQUEUE
376 */
377int ip_recv_error(struct sock *sk, struct msghdr *msg, int len)
378{
379 struct sock_exterr_skb *serr;
380 struct sk_buff *skb, *skb2;
381 struct sockaddr_in *sin;
382 struct {
383 struct sock_extended_err ee;
384 struct sockaddr_in offender;
385 } errhdr;
386 int err;
387 int copied;
388
389 err = -EAGAIN;
390 skb = skb_dequeue(&sk->sk_error_queue);
391 if (skb == NULL)
392 goto out;
393
394 copied = skb->len;
395 if (copied > len) {
396 msg->msg_flags |= MSG_TRUNC;
397 copied = len;
398 }
399 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
400 if (err)
401 goto out_free_skb;
402
403 sock_recv_timestamp(msg, sk, skb);
404
405 serr = SKB_EXT_ERR(skb);
406
407 sin = (struct sockaddr_in *)msg->msg_name;
408 if (sin) {
409 sin->sin_family = AF_INET;
d56f90a7
ACM		 410 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) +
411 serr->addr_offset);
1da177e4
LT		 412 sin->sin_port = serr->port;
413 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
414 }
415
416 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
417 sin = &errhdr.offender;
418 sin->sin_family = AF_UNSPEC;
419 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) {
420 struct inet_sock *inet = inet_sk(sk);
421
422 sin->sin_family = AF_INET;
eddc9ec5 423 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
1da177e4
LT		 424 sin->sin_port = 0;
425 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
426 if (inet->cmsg_flags)
427 ip_cmsg_recv(msg, skb);
428 }
429
430 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
431
432 /* Now we could try to dump offended packet options */
433
434 msg->msg_flags |= MSG_ERRQUEUE;
435 err = copied;
436
437 /* Reset and regenerate socket error */
e0f9f858 438 spin_lock_bh(&sk->sk_error_queue.lock);
1da177e4 439 sk->sk_err = 0;
4d52cfbe
ED		 440 skb2 = skb_peek(&sk->sk_error_queue);
441 if (skb2 != NULL) {
1da177e4 442 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
e0f9f858 443 spin_unlock_bh(&sk->sk_error_queue.lock);
1da177e4
LT		 444 sk->sk_error_report(sk);
445 } else
e0f9f858 446 spin_unlock_bh(&sk->sk_error_queue.lock);
1da177e4 447
e905a9ed 448out_free_skb:
1da177e4
LT		 449 kfree_skb(skb);
450out:
451 return err;
452}
453
454
f6d8bd05
ED		 455static void opt_kfree_rcu(struct rcu_head *head)
456{
457 kfree(container_of(head, struct ip_options_rcu, rcu));
458}
459
1da177e4 460/*
4d52cfbe
ED		 461 * Socket option code for IP. This is the end of the line after any
462 * TCP,UDP etc options on an IP socket.
1da177e4
LT		 463 */
464
3fdadf7d 465static int do_ip_setsockopt(struct sock *sk, int level,
b7058842 466 int optname, char __user *optval, unsigned int optlen)
1da177e4
LT		 467{
468 struct inet_sock *inet = inet_sk(sk);
09cb105e 469 int val = 0, err;
1da177e4 470
e905a9ed 471 if (((1<<optname) & ((1<<IP_PKTINFO) | (1<<IP_RECVTTL) |
132adf54
SH		 472 (1<<IP_RECVOPTS) | (1<<IP_RECVTOS) |
473 (1<<IP_RETOPTS) | (1<<IP_TOS) |
474 (1<<IP_TTL) | (1<<IP_HDRINCL) |
475 (1<<IP_MTU_DISCOVER) | (1<<IP_RECVERR) |
476 (1<<IP_ROUTER_ALERT) | (1<<IP_FREEBIND) |
d218d111 477 (1<<IP_PASSSEC) | (1<<IP_TRANSPARENT) |
7b2ff18e 478 (1<<IP_MINTTL) | (1<<IP_NODEFRAG))) ||
132adf54 479 optname == IP_MULTICAST_TTL ||
f771bef9 480 optname == IP_MULTICAST_ALL ||
e8b2dfe9
BS		 481 optname == IP_MULTICAST_LOOP ||
482 optname == IP_RECVORIGDSTADDR) {
1da177e4
LT		 483 if (optlen >= sizeof(int)) {
484 if (get_user(val, (int __user *) optval))
485 return -EFAULT;
486 } else if (optlen >= sizeof(char)) {
487 unsigned char ucval;
488
489 if (get_user(ucval, (unsigned char __user *) optval))
490 return -EFAULT;
491 val = (int) ucval;
492 }
493 }
494
495 /* If optlen==0, it is equivalent to val == 0 */
496
6a9fb947 497 if (ip_mroute_opt(optname))
09cb105e 498 return ip_mroute_setsockopt(sk, optname, optval, optlen);
1da177e4
LT		 499
500 err = 0;
501 lock_sock(sk);
502
503 switch (optname) {
132adf54
SH		 504 case IP_OPTIONS:
505 {
f6d8bd05
ED		 506 struct ip_options_rcu *old, *opt = NULL;
507
65a1c4ff 508 if (optlen > 40)
132adf54 509 goto e_inval;
3b1e0a65 510 err = ip_options_get_from_user(sock_net(sk), &opt,
cb84663e 511 optval, optlen);
132adf54
SH		 512 if (err)
513 break;
f6d8bd05
ED		 514 old = rcu_dereference_protected(inet->inet_opt,
515 sock_owned_by_user(sk));
132adf54
SH		 516 if (inet->is_icsk) {
517 struct inet_connection_sock *icsk = inet_csk(sk);
1da177e4 518#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
132adf54
SH		 519 if (sk->sk_family == PF_INET ||
520 (!((1 << sk->sk_state) &
521 (TCPF_LISTEN | TCPF_CLOSE)) &&
c720c7e8 522 inet->inet_daddr != LOOPBACK4_IPV6)) {
1da177e4 523#endif
f6d8bd05
ED		 524 if (old)
525 icsk->icsk_ext_hdr_len -= old->opt.optlen;
132adf54 526 if (opt)
f6d8bd05 527 icsk->icsk_ext_hdr_len += opt->opt.optlen;
132adf54 528 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
1da177e4 529#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1da177e4 530 }
132adf54 531#endif
1da177e4 532 }
f6d8bd05
ED		 533 rcu_assign_pointer(inet->inet_opt, opt);
534 if (old)
535 call_rcu(&old->rcu, opt_kfree_rcu);
132adf54
SH		 536 break;
537 }
538 case IP_PKTINFO:
539 if (val)
540 inet->cmsg_flags |= IP_CMSG_PKTINFO;
541 else
542 inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
543 break;
544 case IP_RECVTTL:
545 if (val)
546 inet->cmsg_flags |= IP_CMSG_TTL;
547 else
548 inet->cmsg_flags &= ~IP_CMSG_TTL;
549 break;
550 case IP_RECVTOS:
551 if (val)
552 inet->cmsg_flags |= IP_CMSG_TOS;
553 else
554 inet->cmsg_flags &= ~IP_CMSG_TOS;
555 break;
556 case IP_RECVOPTS:
557 if (val)
558 inet->cmsg_flags |= IP_CMSG_RECVOPTS;
559 else
560 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
561 break;
562 case IP_RETOPTS:
563 if (val)
564 inet->cmsg_flags |= IP_CMSG_RETOPTS;
565 else
566 inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
567 break;
568 case IP_PASSSEC:
569 if (val)
570 inet->cmsg_flags |= IP_CMSG_PASSSEC;
571 else
572 inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
573 break;
e8b2dfe9
BS		 574 case IP_RECVORIGDSTADDR:
575 if (val)
576 inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR;
577 else
578 inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR;
579 break;
132adf54
SH		 580 case IP_TOS: /* This sets both TOS and Precedence */
581 if (sk->sk_type == SOCK_STREAM) {
2c67e9ac
MŻ		 582 val &= ~INET_ECN_MASK;
583 val |= inet->tos & INET_ECN_MASK;
132adf54 584 }
132adf54
SH		 585 if (inet->tos != val) {
586 inet->tos = val;
587 sk->sk_priority = rt_tos2priority(val);
588 sk_dst_reset(sk);
589 }
590 break;
591 case IP_TTL:
4d52cfbe 592 if (optlen < 1)
132adf54 593 goto e_inval;
4d52cfbe 594 if (val != -1 && (val < 0 || val > 255))
132adf54
SH		 595 goto e_inval;
596 inet->uc_ttl = val;
597 break;
598 case IP_HDRINCL:
599 if (sk->sk_type != SOCK_RAW) {
600 err = -ENOPROTOOPT;
2c7946a7 601 break;
132adf54
SH		 602 }
603 inet->hdrincl = val ? 1 : 0;
604 break;
7b2ff18e
JO		 605 case IP_NODEFRAG:
606 if (sk->sk_type != SOCK_RAW) {
607 err = -ENOPROTOOPT;
608 break;
609 }
610 inet->nodefrag = val ? 1 : 0;
611 break;
132adf54 612 case IP_MTU_DISCOVER:
0eae750e 613 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_PROBE)
132adf54
SH		 614 goto e_inval;
615 inet->pmtudisc = val;
616 break;
617 case IP_RECVERR:
618 inet->recverr = !!val;
619 if (!val)
620 skb_queue_purge(&sk->sk_error_queue);
621 break;
622 case IP_MULTICAST_TTL:
623 if (sk->sk_type == SOCK_STREAM)
624 goto e_inval;
4d52cfbe 625 if (optlen < 1)
132adf54 626 goto e_inval;
09cb105e 627 if (val == -1)
132adf54
SH		 628 val = 1;
629 if (val < 0 || val > 255)
630 goto e_inval;
631 inet->mc_ttl = val;
632 break;
633 case IP_MULTICAST_LOOP:
4d52cfbe 634 if (optlen < 1)
132adf54
SH		 635 goto e_inval;
636 inet->mc_loop = !!val;
637 break;
638 case IP_MULTICAST_IF:
639 {
640 struct ip_mreqn mreq;
641 struct net_device *dev = NULL;
642
643 if (sk->sk_type == SOCK_STREAM)
644 goto e_inval;
645 /*
646 * Check the arguments are allowable
647 */
648
0915921b
SW		 649 if (optlen < sizeof(struct in_addr))
650 goto e_inval;
651
132adf54
SH		 652 err = -EFAULT;
653 if (optlen >= sizeof(struct ip_mreqn)) {
09cb105e 654 if (copy_from_user(&mreq, optval, sizeof(mreq)))
1da177e4 655 break;
132adf54
SH		 656 } else {
657 memset(&mreq, 0, sizeof(mreq));
658 if (optlen >= sizeof(struct in_addr) &&
4d52cfbe
ED		 659 copy_from_user(&mreq.imr_address, optval,
660 sizeof(struct in_addr)))
132adf54
SH		 661 break;
662 }
663
664 if (!mreq.imr_ifindex) {
e6f1cebf 665 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) {
132adf54
SH		 666 inet->mc_index = 0;
667 inet->mc_addr = 0;
668 err = 0;
1da177e4
LT		 669 break;
670 }
3b1e0a65 671 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr);
55b80503 672 if (dev)
132adf54 673 mreq.imr_ifindex = dev->ifindex;
132adf54 674 } else
55b80503 675 dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex);
1da177e4 676
1da177e4 677
132adf54
SH		 678 err = -EADDRNOTAVAIL;
679 if (!dev)
680 break;
55b80503 681 dev_put(dev);
132adf54
SH		 682
683 err = -EINVAL;
684 if (sk->sk_bound_dev_if &&
685 mreq.imr_ifindex != sk->sk_bound_dev_if)
686 break;
1da177e4 687
132adf54
SH		 688 inet->mc_index = mreq.imr_ifindex;
689 inet->mc_addr = mreq.imr_address.s_addr;
690 err = 0;
691 break;
692 }
1da177e4 693
132adf54
SH		 694 case IP_ADD_MEMBERSHIP:
695 case IP_DROP_MEMBERSHIP:
696 {
697 struct ip_mreqn mreq;
1da177e4 698
a96fb49b
FL		 699 err = -EPROTO;
700 if (inet_sk(sk)->is_icsk)
701 break;
702
132adf54
SH		 703 if (optlen < sizeof(struct ip_mreq))
704 goto e_inval;
705 err = -EFAULT;
706 if (optlen >= sizeof(struct ip_mreqn)) {
09cb105e 707 if (copy_from_user(&mreq, optval, sizeof(mreq)))
1da177e4 708 break;
132adf54
SH		 709 } else {
710 memset(&mreq, 0, sizeof(mreq));
09cb105e 711 if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq)))
1da177e4 712 break;
132adf54 713 }
1da177e4 714
132adf54
SH		 715 if (optname == IP_ADD_MEMBERSHIP)
716 err = ip_mc_join_group(sk, &mreq);
717 else
718 err = ip_mc_leave_group(sk, &mreq);
719 break;
720 }
721 case IP_MSFILTER:
722 {
132adf54
SH		 723 struct ip_msfilter *msf;
724
725 if (optlen < IP_MSFILTER_SIZE(0))
726 goto e_inval;
727 if (optlen > sysctl_optmem_max) {
728 err = -ENOBUFS;
1da177e4
LT		 729 break;
730 }
132adf54 731 msf = kmalloc(optlen, GFP_KERNEL);
cfcabdcc 732 if (!msf) {
132adf54
SH		 733 err = -ENOBUFS;
734 break;
735 }
736 err = -EFAULT;
737 if (copy_from_user(msf, optval, optlen)) {
738 kfree(msf);
739 break;
740 }
741 /* numsrc >= (1G-4) overflow in 32 bits */
742 if (msf->imsf_numsrc >= 0x3ffffffcU ||
743 msf->imsf_numsrc > sysctl_igmp_max_msf) {
744 kfree(msf);
745 err = -ENOBUFS;
746 break;
747 }
748 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
749 kfree(msf);
750 err = -EINVAL;
751 break;
752 }
753 err = ip_mc_msfilter(sk, msf, 0);
754 kfree(msf);
755 break;
756 }
757 case IP_BLOCK_SOURCE:
758 case IP_UNBLOCK_SOURCE:
759 case IP_ADD_SOURCE_MEMBERSHIP:
760 case IP_DROP_SOURCE_MEMBERSHIP:
761 {
762 struct ip_mreq_source mreqs;
763 int omode, add;
1da177e4 764
132adf54
SH		 765 if (optlen != sizeof(struct ip_mreq_source))
766 goto e_inval;
767 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
1da177e4 768 err = -EFAULT;
1da177e4
LT		 769 break;
770 }
132adf54
SH		 771 if (optname == IP_BLOCK_SOURCE) {
772 omode = MCAST_EXCLUDE;
773 add = 1;
774 } else if (optname == IP_UNBLOCK_SOURCE) {
775 omode = MCAST_EXCLUDE;
776 add = 0;
777 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
778 struct ip_mreqn mreq;
1da177e4 779
132adf54
SH		 780 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
781 mreq.imr_address.s_addr = mreqs.imr_interface;
782 mreq.imr_ifindex = 0;
783 err = ip_mc_join_group(sk, &mreq);
784 if (err && err != -EADDRINUSE)
1da177e4 785 break;
132adf54
SH		 786 omode = MCAST_INCLUDE;
787 add = 1;
788 } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
789 omode = MCAST_INCLUDE;
790 add = 0;
791 }
792 err = ip_mc_source(add, omode, sk, &mreqs, 0);
793 break;
794 }
795 case MCAST_JOIN_GROUP:
796 case MCAST_LEAVE_GROUP:
797 {
798 struct group_req greq;
799 struct sockaddr_in *psin;
800 struct ip_mreqn mreq;
801
802 if (optlen < sizeof(struct group_req))
803 goto e_inval;
804 err = -EFAULT;
805 if (copy_from_user(&greq, optval, sizeof(greq)))
806 break;
807 psin = (struct sockaddr_in *)&greq.gr_group;
808 if (psin->sin_family != AF_INET)
809 goto e_inval;
810 memset(&mreq, 0, sizeof(mreq));
811 mreq.imr_multiaddr = psin->sin_addr;
812 mreq.imr_ifindex = greq.gr_interface;
813
814 if (optname == MCAST_JOIN_GROUP)
815 err = ip_mc_join_group(sk, &mreq);
816 else
817 err = ip_mc_leave_group(sk, &mreq);
818 break;
819 }
820 case MCAST_JOIN_SOURCE_GROUP:
821 case MCAST_LEAVE_SOURCE_GROUP:
822 case MCAST_BLOCK_SOURCE:
823 case MCAST_UNBLOCK_SOURCE:
824 {
825 struct group_source_req greqs;
826 struct ip_mreq_source mreqs;
827 struct sockaddr_in *psin;
828 int omode, add;
829
830 if (optlen != sizeof(struct group_source_req))
831 goto e_inval;
832 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
1da177e4 833 err = -EFAULT;
1da177e4
LT		 834 break;
835 }
132adf54
SH		 836 if (greqs.gsr_group.ss_family != AF_INET ||
837 greqs.gsr_source.ss_family != AF_INET) {
838 err = -EADDRNOTAVAIL;
1da177e4
LT		 839 break;
840 }
132adf54
SH		 841 psin = (struct sockaddr_in *)&greqs.gsr_group;
842 mreqs.imr_multiaddr = psin->sin_addr.s_addr;
843 psin = (struct sockaddr_in *)&greqs.gsr_source;
844 mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
845 mreqs.imr_interface = 0; /* use index for mc_source */
846
847 if (optname == MCAST_BLOCK_SOURCE) {
848 omode = MCAST_EXCLUDE;
849 add = 1;
850 } else if (optname == MCAST_UNBLOCK_SOURCE) {
851 omode = MCAST_EXCLUDE;
852 add = 0;
853 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
1da177e4
LT		 854 struct ip_mreqn mreq;
855
132adf54 856 psin = (struct sockaddr_in *)&greqs.gsr_group;
1da177e4 857 mreq.imr_multiaddr = psin->sin_addr;
132adf54
SH		 858 mreq.imr_address.s_addr = 0;
859 mreq.imr_ifindex = greqs.gsr_interface;
860 err = ip_mc_join_group(sk, &mreq);
861 if (err && err != -EADDRINUSE)
862 break;
863 greqs.gsr_interface = mreq.imr_ifindex;
864 omode = MCAST_INCLUDE;
865 add = 1;
866 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
867 omode = MCAST_INCLUDE;
868 add = 0;
869 }
870 err = ip_mc_source(add, omode, sk, &mreqs,
871 greqs.gsr_interface);
872 break;
873 }
874 case MCAST_MSFILTER:
875 {
132adf54
SH		 876 struct sockaddr_in *psin;
877 struct ip_msfilter *msf = NULL;
878 struct group_filter *gsf = NULL;
879 int msize, i, ifindex;
880
881 if (optlen < GROUP_FILTER_SIZE(0))
882 goto e_inval;
883 if (optlen > sysctl_optmem_max) {
884 err = -ENOBUFS;
1da177e4
LT		 885 break;
886 }
09cb105e 887 gsf = kmalloc(optlen, GFP_KERNEL);
cfcabdcc 888 if (!gsf) {
132adf54 889 err = -ENOBUFS;
1da177e4
LT		 890 break;
891 }
132adf54 892 err = -EFAULT;
4d52cfbe 893 if (copy_from_user(gsf, optval, optlen))
132adf54 894 goto mc_msf_out;
4d52cfbe 895
132adf54
SH		 896 /* numsrc >= (4G-140)/128 overflow in 32 bits */
897 if (gsf->gf_numsrc >= 0x1ffffff ||
898 gsf->gf_numsrc > sysctl_igmp_max_msf) {
899 err = -ENOBUFS;
900 goto mc_msf_out;
901 }
902 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
903 err = -EINVAL;
904 goto mc_msf_out;
905 }
906 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
09cb105e 907 msf = kmalloc(msize, GFP_KERNEL);
cfcabdcc 908 if (!msf) {
132adf54
SH		 909 err = -ENOBUFS;
910 goto mc_msf_out;
911 }
912 ifindex = gsf->gf_interface;
913 psin = (struct sockaddr_in *)&gsf->gf_group;
914 if (psin->sin_family != AF_INET) {
1da177e4 915 err = -EADDRNOTAVAIL;
132adf54 916 goto mc_msf_out;
1da177e4 917 }
132adf54
SH		 918 msf->imsf_multiaddr = psin->sin_addr.s_addr;
919 msf->imsf_interface = 0;
920 msf->imsf_fmode = gsf->gf_fmode;
921 msf->imsf_numsrc = gsf->gf_numsrc;
922 err = -EADDRNOTAVAIL;
4d52cfbe 923 for (i = 0; i < gsf->gf_numsrc; ++i) {
132adf54 924 psin = (struct sockaddr_in *)&gsf->gf_slist[i];
e905a9ed 925
132adf54
SH		 926 if (psin->sin_family != AF_INET)
927 goto mc_msf_out;
928 msf->imsf_slist[i] = psin->sin_addr.s_addr;
929 }
930 kfree(gsf);
931 gsf = NULL;
932
933 err = ip_mc_msfilter(sk, msf, ifindex);
4d52cfbe 934mc_msf_out:
132adf54
SH		 935 kfree(msf);
936 kfree(gsf);
937 break;
938 }
f771bef9
NS		 939 case IP_MULTICAST_ALL:
940 if (optlen < 1)
941 goto e_inval;
942 if (val != 0 && val != 1)
943 goto e_inval;
944 inet->mc_all = val;
945 break;
132adf54
SH		 946 case IP_ROUTER_ALERT:
947 err = ip_ra_control(sk, val ? 1 : 0, NULL);
948 break;
949
950 case IP_FREEBIND:
4d52cfbe 951 if (optlen < 1)
132adf54
SH		 952 goto e_inval;
953 inet->freebind = !!val;
954 break;
955
956 case IP_IPSEC_POLICY:
957 case IP_XFRM_POLICY:
958 err = -EPERM;
959 if (!capable(CAP_NET_ADMIN))
1da177e4 960 break;
132adf54
SH		 961 err = xfrm_user_policy(sk, optname, optval, optlen);
962 break;
1da177e4 963
f5715aea 964 case IP_TRANSPARENT:
6cc7a765 965 if (!!val && !capable(CAP_NET_RAW) && !capable(CAP_NET_ADMIN)) {
f5715aea
KK		 966 err = -EPERM;
967 break;
968 }
969 if (optlen < 1)
970 goto e_inval;
971 inet->transparent = !!val;
972 break;
973
d218d111
SH		 974 case IP_MINTTL:
975 if (optlen < 1)
976 goto e_inval;
977 if (val < 0 || val > 255)
978 goto e_inval;
979 inet->min_ttl = val;
980 break;
981
132adf54
SH		 982 default:
983 err = -ENOPROTOOPT;
984 break;
1da177e4
LT		 985 }
986 release_sock(sk);
987 return err;
988
989e_inval:
990 release_sock(sk);
991 return -EINVAL;
992}
993
f84af32c
ED		 994/**
995 * ip_queue_rcv_skb - Queue an skb into sock receive queue
996 * @sk: socket
997 * @skb: buffer
998 *
999 * Queues an skb into socket receive queue. If IP_CMSG_PKTINFO option
1000 * is not set, we drop skb dst entry now, while dst cache line is hot.
1001 */
1002int ip_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
1003{
1004 if (!(inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO))
1005 skb_dst_drop(skb);
1006 return sock_queue_rcv_skb(sk, skb);
1007}
1008EXPORT_SYMBOL(ip_queue_rcv_skb);
1009
3fdadf7d 1010int ip_setsockopt(struct sock *sk, int level,
b7058842 1011 int optname, char __user *optval, unsigned int optlen)
3fdadf7d
DM		 1012{
1013 int err;
1014
1015 if (level != SOL_IP)
1016 return -ENOPROTOOPT;
1017
1018 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1019#ifdef CONFIG_NETFILTER
1020 /* we need to exclude all possible ENOPROTOOPTs except default case */
1021 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
6a9fb947
PE		 1022 optname != IP_IPSEC_POLICY &&
1023 optname != IP_XFRM_POLICY &&
1024 !ip_mroute_opt(optname)) {
3fdadf7d
DM		 1025 lock_sock(sk);
1026 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
1027 release_sock(sk);
1028 }
1029#endif
1030 return err;
1031}
4d52cfbe 1032EXPORT_SYMBOL(ip_setsockopt);
3fdadf7d
DM		 1033
1034#ifdef CONFIG_COMPAT
543d9cfe 1035int compat_ip_setsockopt(struct sock *sk, int level, int optname,
b7058842 1036 char __user *optval, unsigned int optlen)
3fdadf7d
DM		 1037{
1038 int err;
1039
1040 if (level != SOL_IP)
1041 return -ENOPROTOOPT;
1042
dae50295
DS		 1043 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
1044 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
1045 ip_setsockopt);
1046
3fdadf7d
DM		 1047 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1048#ifdef CONFIG_NETFILTER
1049 /* we need to exclude all possible ENOPROTOOPTs except default case */
1050 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
6a9fb947
PE		 1051 optname != IP_IPSEC_POLICY &&
1052 optname != IP_XFRM_POLICY &&
1053 !ip_mroute_opt(optname)) {
3fdadf7d 1054 lock_sock(sk);
543d9cfe
ACM		 1055 err = compat_nf_setsockopt(sk, PF_INET, optname,
1056 optval, optlen);
3fdadf7d
DM		 1057 release_sock(sk);
1058 }
1059#endif
1060 return err;
1061}
543d9cfe 1062EXPORT_SYMBOL(compat_ip_setsockopt);
3fdadf7d
DM		 1063#endif
1064
1da177e4 1065/*
4d52cfbe
ED		 1066 * Get the options. Note for future reference. The GET of IP options gets
1067 * the _received_ ones. The set sets the _sent_ ones.
1da177e4
LT		 1068 */
1069
3fdadf7d 1070static int do_ip_getsockopt(struct sock *sk, int level, int optname,
dd23198e 1071 char __user *optval, int __user *optlen, unsigned flags)
1da177e4
LT		 1072{
1073 struct inet_sock *inet = inet_sk(sk);
1074 int val;
1075 int len;
e905a9ed 1076
132adf54 1077 if (level != SOL_IP)
1da177e4
LT		 1078 return -EOPNOTSUPP;
1079
6a9fb947 1080 if (ip_mroute_opt(optname))
09cb105e 1081 return ip_mroute_getsockopt(sk, optname, optval, optlen);
1da177e4 1082
09cb105e 1083 if (get_user(len, optlen))
1da177e4 1084 return -EFAULT;
132adf54 1085 if (len < 0)
1da177e4 1086 return -EINVAL;
e905a9ed 1087
1da177e4
LT		 1088 lock_sock(sk);
1089
132adf54
SH		 1090 switch (optname) {
1091 case IP_OPTIONS:
1092 {
1093 unsigned char optbuf[sizeof(struct ip_options)+40];
f6d8bd05
ED		 1094 struct ip_options *opt = (struct ip_options *)optbuf;
1095 struct ip_options_rcu *inet_opt;
1096
1097 inet_opt = rcu_dereference_protected(inet->inet_opt,
1098 sock_owned_by_user(sk));
132adf54 1099 opt->optlen = 0;
f6d8bd05
ED		 1100 if (inet_opt)
1101 memcpy(optbuf, &inet_opt->opt,
1102 sizeof(struct ip_options) +
1103 inet_opt->opt.optlen);
132adf54
SH		 1104 release_sock(sk);
1105
1106 if (opt->optlen == 0)
1107 return put_user(0, optlen);
1108
1109 ip_options_undo(opt);
1110
1111 len = min_t(unsigned int, len, opt->optlen);
1112 if (put_user(len, optlen))
1113 return -EFAULT;
1114 if (copy_to_user(optval, opt->__data, len))
1115 return -EFAULT;
1116 return 0;
1117 }
1118 case IP_PKTINFO:
1119 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
1120 break;
1121 case IP_RECVTTL:
1122 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
1123 break;
1124 case IP_RECVTOS:
1125 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
1126 break;
1127 case IP_RECVOPTS:
1128 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
1129 break;
1130 case IP_RETOPTS:
1131 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
1132 break;
1133 case IP_PASSSEC:
1134 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
1135 break;
e8b2dfe9
BS		 1136 case IP_RECVORIGDSTADDR:
1137 val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0;
1138 break;
132adf54
SH		 1139 case IP_TOS:
1140 val = inet->tos;
1141 break;
1142 case IP_TTL:
1143 val = (inet->uc_ttl == -1 ?
1144 sysctl_ip_default_ttl :
1145 inet->uc_ttl);
1146 break;
1147 case IP_HDRINCL:
1148 val = inet->hdrincl;
1149 break;
a89b4763
MK		 1150 case IP_NODEFRAG:
1151 val = inet->nodefrag;
1152 break;
132adf54
SH		 1153 case IP_MTU_DISCOVER:
1154 val = inet->pmtudisc;
1155 break;
1156 case IP_MTU:
1157 {
1158 struct dst_entry *dst;
1159 val = 0;
1160 dst = sk_dst_get(sk);
1161 if (dst) {
1162 val = dst_mtu(dst);
1163 dst_release(dst);
1da177e4 1164 }
132adf54 1165 if (!val) {
1da177e4 1166 release_sock(sk);
132adf54 1167 return -ENOTCONN;
1da177e4 1168 }
132adf54
SH		 1169 break;
1170 }
1171 case IP_RECVERR:
1172 val = inet->recverr;
1173 break;
1174 case IP_MULTICAST_TTL:
1175 val = inet->mc_ttl;
1176 break;
1177 case IP_MULTICAST_LOOP:
1178 val = inet->mc_loop;
1179 break;
1180 case IP_MULTICAST_IF:
1181 {
1182 struct in_addr addr;
1183 len = min_t(unsigned int, len, sizeof(struct in_addr));
1184 addr.s_addr = inet->mc_addr;
1185 release_sock(sk);
1da177e4 1186
132adf54
SH		 1187 if (put_user(len, optlen))
1188 return -EFAULT;
1189 if (copy_to_user(optval, &addr, len))
1190 return -EFAULT;
1191 return 0;
1192 }
1193 case IP_MSFILTER:
1194 {
1195 struct ip_msfilter msf;
1196 int err;
1197
1198 if (len < IP_MSFILTER_SIZE(0)) {
1da177e4 1199 release_sock(sk);
132adf54 1200 return -EINVAL;
1da177e4 1201 }
132adf54 1202 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
1da177e4 1203 release_sock(sk);
132adf54 1204 return -EFAULT;
1da177e4 1205 }
132adf54
SH		 1206 err = ip_mc_msfget(sk, &msf,
1207 (struct ip_msfilter __user *)optval, optlen);
1208 release_sock(sk);
1209 return err;
1210 }
1211 case MCAST_MSFILTER:
1212 {
1213 struct group_filter gsf;
1214 int err;
1da177e4 1215
132adf54 1216 if (len < GROUP_FILTER_SIZE(0)) {
1da177e4 1217 release_sock(sk);
132adf54
SH		 1218 return -EINVAL;
1219 }
1220 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
1221 release_sock(sk);
1222 return -EFAULT;
1223 }
1224 err = ip_mc_gsfget(sk, &gsf,
4d52cfbe
ED		 1225 (struct group_filter __user *)optval,
1226 optlen);
132adf54
SH		 1227 release_sock(sk);
1228 return err;
1229 }
f771bef9
NS		 1230 case IP_MULTICAST_ALL:
1231 val = inet->mc_all;
1232 break;
132adf54
SH		 1233 case IP_PKTOPTIONS:
1234 {
1235 struct msghdr msg;
1da177e4 1236
132adf54 1237 release_sock(sk);
1da177e4 1238
132adf54
SH		 1239 if (sk->sk_type != SOCK_STREAM)
1240 return -ENOPROTOOPT;
1da177e4 1241
132adf54
SH		 1242 msg.msg_control = optval;
1243 msg.msg_controllen = len;
dd23198e 1244 msg.msg_flags = flags;
1da177e4 1245
132adf54
SH		 1246 if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
1247 struct in_pktinfo info;
1248
c720c7e8
ED		 1249 info.ipi_addr.s_addr = inet->inet_rcv_saddr;
1250 info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr;
132adf54
SH		 1251 info.ipi_ifindex = inet->mc_index;
1252 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
1da177e4 1253 }
132adf54
SH		 1254 if (inet->cmsg_flags & IP_CMSG_TTL) {
1255 int hlim = inet->mc_ttl;
1256 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
1257 }
1258 len -= msg.msg_controllen;
1259 return put_user(len, optlen);
1260 }
1261 case IP_FREEBIND:
1262 val = inet->freebind;
1263 break;
f5715aea
KK		 1264 case IP_TRANSPARENT:
1265 val = inet->transparent;
1266 break;
d218d111
SH		 1267 case IP_MINTTL:
1268 val = inet->min_ttl;
1269 break;
132adf54
SH		 1270 default:
1271 release_sock(sk);
1272 return -ENOPROTOOPT;
1da177e4
LT		 1273 }
1274 release_sock(sk);
e905a9ed 1275
4d52cfbe 1276 if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) {
1da177e4
LT		 1277 unsigned char ucval = (unsigned char)val;
1278 len = 1;
132adf54 1279 if (put_user(len, optlen))
1da177e4 1280 return -EFAULT;
09cb105e 1281 if (copy_to_user(optval, &ucval, 1))
1da177e4
LT		 1282 return -EFAULT;
1283 } else {
1284 len = min_t(unsigned int, sizeof(int), len);
132adf54 1285 if (put_user(len, optlen))
1da177e4 1286 return -EFAULT;
09cb105e 1287 if (copy_to_user(optval, &val, len))
1da177e4
LT		 1288 return -EFAULT;
1289 }
1290 return 0;
1291}
1292
3fdadf7d 1293int ip_getsockopt(struct sock *sk, int level,
132adf54 1294 int optname, char __user *optval, int __user *optlen)
3fdadf7d
DM		 1295{
1296 int err;
1297
dd23198e 1298 err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0);
3fdadf7d
DM		 1299#ifdef CONFIG_NETFILTER
1300 /* we need to exclude all possible ENOPROTOOPTs except default case */
6a9fb947
PE		 1301 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1302 !ip_mroute_opt(optname)) {
e905a9ed 1303 int len;
3fdadf7d 1304
09cb105e 1305 if (get_user(len, optlen))
3fdadf7d
DM		 1306 return -EFAULT;
1307
1308 lock_sock(sk);
1309 err = nf_getsockopt(sk, PF_INET, optname, optval,
1310 &len);
1311 release_sock(sk);
1312 if (err >= 0)
1313 err = put_user(len, optlen);
1314 return err;
1315 }
1316#endif
1317 return err;
1318}
4d52cfbe 1319EXPORT_SYMBOL(ip_getsockopt);
3fdadf7d
DM		 1320
1321#ifdef CONFIG_COMPAT
543d9cfe
ACM		 1322int compat_ip_getsockopt(struct sock *sk, int level, int optname,
1323 char __user *optval, int __user *optlen)
3fdadf7d 1324{
42908c69
DS		 1325 int err;
1326
1327 if (optname == MCAST_MSFILTER)
1328 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1329 ip_getsockopt);
1330
dd23198e
DB		 1331 err = do_ip_getsockopt(sk, level, optname, optval, optlen,
1332 MSG_CMSG_COMPAT);
42908c69 1333
3fdadf7d
DM		 1334#ifdef CONFIG_NETFILTER
1335 /* we need to exclude all possible ENOPROTOOPTs except default case */
6a9fb947
PE		 1336 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1337 !ip_mroute_opt(optname)) {
e905a9ed 1338 int len;
3fdadf7d 1339
543d9cfe 1340 if (get_user(len, optlen))
3fdadf7d
DM		 1341 return -EFAULT;
1342
1343 lock_sock(sk);
543d9cfe 1344 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
3fdadf7d
DM		 1345 release_sock(sk);
1346 if (err >= 0)
1347 err = put_user(len, optlen);
1348 return err;
1349 }
1350#endif
1351 return err;
1352}
543d9cfe 1353EXPORT_SYMBOL(compat_ip_getsockopt);
3fdadf7d 1354#endif
kernel source for telekom puls (alcatel/mediatek)