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net: Allow userns root to control ipv4
[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>
dfd56b8b 40#if IS_ENABLED(CONFIG_IPV6)
1da177e4
LT		 41#include <net/transp_v6.h>
42#endif
35ebf65e 43#include <net/ip_fib.h>
1da177e4
LT		 44
45#include <linux/errqueue.h>
46#include <asm/uaccess.h>
47
48#define IP_CMSG_PKTINFO 1
49#define IP_CMSG_TTL 2
50#define IP_CMSG_TOS 4
51#define IP_CMSG_RECVOPTS 8
52#define IP_CMSG_RETOPTS 16
2c7946a7 53#define IP_CMSG_PASSSEC 32
e8b2dfe9 54#define IP_CMSG_ORIGDSTADDR 64
1da177e4
LT		 55
56/*
57 * SOL_IP control messages.
58 */
d826eb14 59#define PKTINFO_SKB_CB(__skb) ((struct in_pktinfo *)((__skb)->cb))
1da177e4
LT		 60
61static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb)
62{
d826eb14 63 struct in_pktinfo info = *PKTINFO_SKB_CB(skb);
1da177e4 64
eddc9ec5 65 info.ipi_addr.s_addr = ip_hdr(skb)->daddr;
1da177e4
LT		 66
67 put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
68}
69
70static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb)
71{
eddc9ec5 72 int ttl = ip_hdr(skb)->ttl;
1da177e4
LT		 73 put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl);
74}
75
76static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb)
77{
eddc9ec5 78 put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos);
1da177e4
LT		 79}
80
81static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb)
82{
83 if (IPCB(skb)->opt.optlen == 0)
84 return;
85
eddc9ec5
ACM		 86 put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen,
87 ip_hdr(skb) + 1);
1da177e4
LT		 88}
89
90
91static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb)
92{
93 unsigned char optbuf[sizeof(struct ip_options) + 40];
5e73ea1a 94 struct ip_options *opt = (struct ip_options *)optbuf;
1da177e4
LT		 95
96 if (IPCB(skb)->opt.optlen == 0)
97 return;
98
99 if (ip_options_echo(opt, skb)) {
100 msg->msg_flags |= MSG_CTRUNC;
101 return;
102 }
103 ip_options_undo(opt);
104
105 put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data);
106}
107
2c7946a7
CZ		 108static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
109{
110 char *secdata;
dc49c1f9 111 u32 seclen, secid;
2c7946a7
CZ		 112 int err;
113
dc49c1f9
CZ		 114 err = security_socket_getpeersec_dgram(NULL, skb, &secid);
115 if (err)
116 return;
117
118 err = security_secid_to_secctx(secid, &secdata, &seclen);
2c7946a7
CZ		 119 if (err)
120 return;
121
122 put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata);
dc49c1f9 123 security_release_secctx(secdata, seclen);
2c7946a7
CZ		 124}
125
21d1a161 126static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb)
e8b2dfe9
BS		 127{
128 struct sockaddr_in sin;
b71d1d42 129 const struct iphdr *iph = ip_hdr(skb);
21d1a161 130 __be16 *ports = (__be16 *)skb_transport_header(skb);
e8b2dfe9
BS		 131
132 if (skb_transport_offset(skb) + 4 > skb->len)
133 return;
134
135 /* All current transport protocols have the port numbers in the
136 * first four bytes of the transport header and this function is
137 * written with this assumption in mind.
138 */
139
140 sin.sin_family = AF_INET;
141 sin.sin_addr.s_addr = iph->daddr;
142 sin.sin_port = ports[1];
143 memset(sin.sin_zero, 0, sizeof(sin.sin_zero));
144
145 put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin);
146}
1da177e4
LT		 147
148void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
149{
150 struct inet_sock *inet = inet_sk(skb->sk);
95c96174 151 unsigned int flags = inet->cmsg_flags;
1da177e4
LT		 152
153 /* Ordered by supposed usage frequency */
154 if (flags & 1)
155 ip_cmsg_recv_pktinfo(msg, skb);
4d52cfbe 156 if ((flags >>= 1) == 0)
1da177e4
LT		 157 return;
158
159 if (flags & 1)
160 ip_cmsg_recv_ttl(msg, skb);
4d52cfbe 161 if ((flags >>= 1) == 0)
1da177e4
LT		 162 return;
163
164 if (flags & 1)
165 ip_cmsg_recv_tos(msg, skb);
4d52cfbe 166 if ((flags >>= 1) == 0)
1da177e4
LT		 167 return;
168
169 if (flags & 1)
170 ip_cmsg_recv_opts(msg, skb);
4d52cfbe 171 if ((flags >>= 1) == 0)
1da177e4
LT		 172 return;
173
174 if (flags & 1)
175 ip_cmsg_recv_retopts(msg, skb);
4d52cfbe 176 if ((flags >>= 1) == 0)
2c7946a7
CZ		 177 return;
178
179 if (flags & 1)
180 ip_cmsg_recv_security(msg, skb);
e8b2dfe9 181
4d52cfbe 182 if ((flags >>= 1) == 0)
e8b2dfe9
BS		 183 return;
184 if (flags & 1)
185 ip_cmsg_recv_dstaddr(msg, skb);
186
1da177e4 187}
4d52cfbe 188EXPORT_SYMBOL(ip_cmsg_recv);
1da177e4 189
7a6adb92 190int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc)
1da177e4
LT		 191{
192 int err;
193 struct cmsghdr *cmsg;
194
195 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
196 if (!CMSG_OK(msg, cmsg))
197 return -EINVAL;
198 if (cmsg->cmsg_level != SOL_IP)
199 continue;
200 switch (cmsg->cmsg_type) {
201 case IP_RETOPTS:
202 err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
4d52cfbe
ED		 203 err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg),
204 err < 40 ? err : 40);
1da177e4
LT		 205 if (err)
206 return err;
207 break;
208 case IP_PKTINFO:
209 {
210 struct in_pktinfo *info;
211 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
212 return -EINVAL;
213 info = (struct in_pktinfo *)CMSG_DATA(cmsg);
214 ipc->oif = info->ipi_ifindex;
215 ipc->addr = info->ipi_spec_dst.s_addr;
216 break;
217 }
218 default:
219 return -EINVAL;
220 }
221 }
222 return 0;
223}
224
225
226/* Special input handler for packets caught by router alert option.
227 They are selected only by protocol field, and then processed likely
228 local ones; but only if someone wants them! Otherwise, router
229 not running rsvpd will kill RSVP.
230
231 It is user level problem, what it will make with them.
232 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
233 but receiver should be enough clever f.e. to forward mtrace requests,
234 sent to multicast group to reach destination designated router.
235 */
43a951e9 236struct ip_ra_chain __rcu *ip_ra_chain;
66018506
ED		 237static DEFINE_SPINLOCK(ip_ra_lock);
238
592fcb9d
ED		 239
240static void ip_ra_destroy_rcu(struct rcu_head *head)
66018506 241{
592fcb9d
ED		 242 struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu);
243
244 sock_put(ra->saved_sk);
245 kfree(ra);
66018506 246}
1da177e4 247
4d52cfbe
ED		 248int ip_ra_control(struct sock *sk, unsigned char on,
249 void (*destructor)(struct sock *))
1da177e4 250{
43a951e9
ED		 251 struct ip_ra_chain *ra, *new_ra;
252 struct ip_ra_chain __rcu **rap;
1da177e4 253
c720c7e8 254 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW)
1da177e4
LT		 255 return -EINVAL;
256
257 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
258
66018506 259 spin_lock_bh(&ip_ra_lock);
43a951e9
ED		 260 for (rap = &ip_ra_chain;
261 (ra = rcu_dereference_protected(*rap,
262 lockdep_is_held(&ip_ra_lock))) != NULL;
263 rap = &ra->next) {
1da177e4
LT		 264 if (ra->sk == sk) {
265 if (on) {
66018506 266 spin_unlock_bh(&ip_ra_lock);
a51482bd 267 kfree(new_ra);
1da177e4
LT		 268 return -EADDRINUSE;
269 }
592fcb9d
ED		 270 /* dont let ip_call_ra_chain() use sk again */
271 ra->sk = NULL;
66018506
ED		 272 rcu_assign_pointer(*rap, ra->next);
273 spin_unlock_bh(&ip_ra_lock);
1da177e4
LT		 274
275 if (ra->destructor)
276 ra->destructor(sk);
592fcb9d
ED		 277 /*
278 * Delay sock_put(sk) and kfree(ra) after one rcu grace
279 * period. This guarantee ip_call_ra_chain() dont need
280 * to mess with socket refcounts.
281 */
282 ra->saved_sk = sk;
283 call_rcu(&ra->rcu, ip_ra_destroy_rcu);
1da177e4
LT		 284 return 0;
285 }
286 }
287 if (new_ra == NULL) {
66018506 288 spin_unlock_bh(&ip_ra_lock);
1da177e4
LT		 289 return -ENOBUFS;
290 }
291 new_ra->sk = sk;
292 new_ra->destructor = destructor;
293
294 new_ra->next = ra;
66018506 295 rcu_assign_pointer(*rap, new_ra);
1da177e4 296 sock_hold(sk);
66018506 297 spin_unlock_bh(&ip_ra_lock);
1da177e4
LT		 298
299 return 0;
300}
301
e905a9ed 302void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
35986b32 303 __be16 port, u32 info, u8 *payload)
1da177e4 304{
1da177e4
LT		 305 struct sock_exterr_skb *serr;
306
1da177e4
LT		 307 skb = skb_clone(skb, GFP_ATOMIC);
308 if (!skb)
309 return;
310
e905a9ed 311 serr = SKB_EXT_ERR(skb);
1da177e4
LT		 312 serr->ee.ee_errno = err;
313 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
88c7664f
ACM		 314 serr->ee.ee_type = icmp_hdr(skb)->type;
315 serr->ee.ee_code = icmp_hdr(skb)->code;
1da177e4
LT		 316 serr->ee.ee_pad = 0;
317 serr->ee.ee_info = info;
318 serr->ee.ee_data = 0;
88c7664f 319 serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) -
d56f90a7 320 skb_network_header(skb);
1da177e4
LT		 321 serr->port = port;
322
bd82393c
ACM		 323 if (skb_pull(skb, payload - skb->data) != NULL) {
324 skb_reset_transport_header(skb);
325 if (sock_queue_err_skb(sk, skb) == 0)
326 return;
327 }
328 kfree_skb(skb);
1da177e4
LT		 329}
330
0579016e 331void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info)
1da177e4
LT		 332{
333 struct inet_sock *inet = inet_sk(sk);
334 struct sock_exterr_skb *serr;
335 struct iphdr *iph;
336 struct sk_buff *skb;
337
338 if (!inet->recverr)
339 return;
340
341 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
342 if (!skb)
343 return;
344
2ca9e6f2
ACM		 345 skb_put(skb, sizeof(struct iphdr));
346 skb_reset_network_header(skb);
eddc9ec5 347 iph = ip_hdr(skb);
1da177e4
LT		 348 iph->daddr = daddr;
349
e905a9ed 350 serr = SKB_EXT_ERR(skb);
1da177e4
LT		 351 serr->ee.ee_errno = err;
352 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
e905a9ed 353 serr->ee.ee_type = 0;
1da177e4
LT		 354 serr->ee.ee_code = 0;
355 serr->ee.ee_pad = 0;
356 serr->ee.ee_info = info;
357 serr->ee.ee_data = 0;
d56f90a7 358 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
1da177e4
LT		 359 serr->port = port;
360
27a884dc 361 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
bd82393c 362 skb_reset_transport_header(skb);
1da177e4
LT		 363
364 if (sock_queue_err_skb(sk, skb))
365 kfree_skb(skb);
366}
367
e905a9ed 368/*
1da177e4
LT		 369 * Handle MSG_ERRQUEUE
370 */
371int ip_recv_error(struct sock *sk, struct msghdr *msg, int len)
372{
373 struct sock_exterr_skb *serr;
374 struct sk_buff *skb, *skb2;
375 struct sockaddr_in *sin;
376 struct {
377 struct sock_extended_err ee;
378 struct sockaddr_in offender;
379 } errhdr;
380 int err;
381 int copied;
382
383 err = -EAGAIN;
384 skb = skb_dequeue(&sk->sk_error_queue);
385 if (skb == NULL)
386 goto out;
387
388 copied = skb->len;
389 if (copied > len) {
390 msg->msg_flags |= MSG_TRUNC;
391 copied = len;
392 }
393 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
394 if (err)
395 goto out_free_skb;
396
397 sock_recv_timestamp(msg, sk, skb);
398
399 serr = SKB_EXT_ERR(skb);
400
401 sin = (struct sockaddr_in *)msg->msg_name;
402 if (sin) {
403 sin->sin_family = AF_INET;
d56f90a7
ACM		 404 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) +
405 serr->addr_offset);
1da177e4
LT		 406 sin->sin_port = serr->port;
407 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
408 }
409
410 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
411 sin = &errhdr.offender;
412 sin->sin_family = AF_UNSPEC;
413 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) {
414 struct inet_sock *inet = inet_sk(sk);
415
416 sin->sin_family = AF_INET;
eddc9ec5 417 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
1da177e4
LT		 418 sin->sin_port = 0;
419 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
420 if (inet->cmsg_flags)
421 ip_cmsg_recv(msg, skb);
422 }
423
424 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
425
426 /* Now we could try to dump offended packet options */
427
428 msg->msg_flags |= MSG_ERRQUEUE;
429 err = copied;
430
431 /* Reset and regenerate socket error */
e0f9f858 432 spin_lock_bh(&sk->sk_error_queue.lock);
1da177e4 433 sk->sk_err = 0;
4d52cfbe
ED		 434 skb2 = skb_peek(&sk->sk_error_queue);
435 if (skb2 != NULL) {
1da177e4 436 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
e0f9f858 437 spin_unlock_bh(&sk->sk_error_queue.lock);
1da177e4
LT		 438 sk->sk_error_report(sk);
439 } else
e0f9f858 440 spin_unlock_bh(&sk->sk_error_queue.lock);
1da177e4 441
e905a9ed 442out_free_skb:
1da177e4
LT		 443 kfree_skb(skb);
444out:
445 return err;
446}
447
448
449/*
4d52cfbe
ED		 450 * Socket option code for IP. This is the end of the line after any
451 * TCP,UDP etc options on an IP socket.
1da177e4
LT		 452 */
453
3fdadf7d 454static int do_ip_setsockopt(struct sock *sk, int level,
b7058842 455 int optname, char __user *optval, unsigned int optlen)
1da177e4
LT		 456{
457 struct inet_sock *inet = inet_sk(sk);
09cb105e 458 int val = 0, err;
1da177e4 459
0c9f79be
XW		 460 switch (optname) {
461 case IP_PKTINFO:
462 case IP_RECVTTL:
463 case IP_RECVOPTS:
464 case IP_RECVTOS:
465 case IP_RETOPTS:
466 case IP_TOS:
467 case IP_TTL:
468 case IP_HDRINCL:
469 case IP_MTU_DISCOVER:
470 case IP_RECVERR:
471 case IP_ROUTER_ALERT:
472 case IP_FREEBIND:
473 case IP_PASSSEC:
474 case IP_TRANSPARENT:
475 case IP_MINTTL:
476 case IP_NODEFRAG:
477 case IP_UNICAST_IF:
478 case IP_MULTICAST_TTL:
479 case IP_MULTICAST_ALL:
480 case IP_MULTICAST_LOOP:
481 case IP_RECVORIGDSTADDR:
1da177e4
LT		 482 if (optlen >= sizeof(int)) {
483 if (get_user(val, (int __user *) optval))
484 return -EFAULT;
485 } else if (optlen >= sizeof(char)) {
486 unsigned char ucval;
487
488 if (get_user(ucval, (unsigned char __user *) optval))
489 return -EFAULT;
490 val = (int) ucval;
491 }
492 }
493
494 /* If optlen==0, it is equivalent to val == 0 */
495
6a9fb947 496 if (ip_mroute_opt(optname))
09cb105e 497 return ip_mroute_setsockopt(sk, optname, optval, optlen);
1da177e4
LT		 498
499 err = 0;
500 lock_sock(sk);
501
502 switch (optname) {
132adf54
SH		 503 case IP_OPTIONS:
504 {
f6d8bd05
ED		 505 struct ip_options_rcu *old, *opt = NULL;
506
65a1c4ff 507 if (optlen > 40)
132adf54 508 goto e_inval;
3b1e0a65 509 err = ip_options_get_from_user(sock_net(sk), &opt,
cb84663e 510 optval, optlen);
132adf54
SH		 511 if (err)
512 break;
f6d8bd05
ED		 513 old = rcu_dereference_protected(inet->inet_opt,
514 sock_owned_by_user(sk));
132adf54
SH		 515 if (inet->is_icsk) {
516 struct inet_connection_sock *icsk = inet_csk(sk);
dfd56b8b 517#if IS_ENABLED(CONFIG_IPV6)
132adf54
SH		 518 if (sk->sk_family == PF_INET ||
519 (!((1 << sk->sk_state) &
520 (TCPF_LISTEN | TCPF_CLOSE)) &&
c720c7e8 521 inet->inet_daddr != LOOPBACK4_IPV6)) {
1da177e4 522#endif
f6d8bd05
ED		 523 if (old)
524 icsk->icsk_ext_hdr_len -= old->opt.optlen;
132adf54 525 if (opt)
f6d8bd05 526 icsk->icsk_ext_hdr_len += opt->opt.optlen;
132adf54 527 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
dfd56b8b 528#if IS_ENABLED(CONFIG_IPV6)
1da177e4 529 }
132adf54 530#endif
1da177e4 531 }
f6d8bd05
ED		 532 rcu_assign_pointer(inet->inet_opt, opt);
533 if (old)
605b4afe 534 kfree_rcu(old, rcu);
132adf54
SH		 535 break;
536 }
537 case IP_PKTINFO:
538 if (val)
539 inet->cmsg_flags |= IP_CMSG_PKTINFO;
540 else
541 inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
542 break;
543 case IP_RECVTTL:
544 if (val)
545 inet->cmsg_flags |= IP_CMSG_TTL;
546 else
547 inet->cmsg_flags &= ~IP_CMSG_TTL;
548 break;
549 case IP_RECVTOS:
550 if (val)
551 inet->cmsg_flags |= IP_CMSG_TOS;
552 else
553 inet->cmsg_flags &= ~IP_CMSG_TOS;
554 break;
555 case IP_RECVOPTS:
556 if (val)
557 inet->cmsg_flags |= IP_CMSG_RECVOPTS;
558 else
559 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
560 break;
561 case IP_RETOPTS:
562 if (val)
563 inet->cmsg_flags |= IP_CMSG_RETOPTS;
564 else
565 inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
566 break;
567 case IP_PASSSEC:
568 if (val)
569 inet->cmsg_flags |= IP_CMSG_PASSSEC;
570 else
571 inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
572 break;
e8b2dfe9
BS		 573 case IP_RECVORIGDSTADDR:
574 if (val)
575 inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR;
576 else
577 inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR;
578 break;
132adf54
SH		 579 case IP_TOS: /* This sets both TOS and Precedence */
580 if (sk->sk_type == SOCK_STREAM) {
2c67e9ac
MŻ		 581 val &= ~INET_ECN_MASK;
582 val |= inet->tos & INET_ECN_MASK;
132adf54 583 }
132adf54
SH		 584 if (inet->tos != val) {
585 inet->tos = val;
586 sk->sk_priority = rt_tos2priority(val);
587 sk_dst_reset(sk);
588 }
589 break;
590 case IP_TTL:
4d52cfbe 591 if (optlen < 1)
132adf54 592 goto e_inval;
4d52cfbe 593 if (val != -1 && (val < 0 || val > 255))
132adf54
SH		 594 goto e_inval;
595 inet->uc_ttl = val;
596 break;
597 case IP_HDRINCL:
598 if (sk->sk_type != SOCK_RAW) {
599 err = -ENOPROTOOPT;
2c7946a7 600 break;
132adf54
SH		 601 }
602 inet->hdrincl = val ? 1 : 0;
603 break;
7b2ff18e
JO		 604 case IP_NODEFRAG:
605 if (sk->sk_type != SOCK_RAW) {
606 err = -ENOPROTOOPT;
607 break;
608 }
609 inet->nodefrag = val ? 1 : 0;
610 break;
132adf54 611 case IP_MTU_DISCOVER:
0eae750e 612 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_PROBE)
132adf54
SH		 613 goto e_inval;
614 inet->pmtudisc = val;
615 break;
616 case IP_RECVERR:
617 inet->recverr = !!val;
618 if (!val)
619 skb_queue_purge(&sk->sk_error_queue);
620 break;
621 case IP_MULTICAST_TTL:
622 if (sk->sk_type == SOCK_STREAM)
623 goto e_inval;
4d52cfbe 624 if (optlen < 1)
132adf54 625 goto e_inval;
09cb105e 626 if (val == -1)
132adf54
SH		 627 val = 1;
628 if (val < 0 || val > 255)
629 goto e_inval;
630 inet->mc_ttl = val;
631 break;
632 case IP_MULTICAST_LOOP:
4d52cfbe 633 if (optlen < 1)
132adf54
SH		 634 goto e_inval;
635 inet->mc_loop = !!val;
636 break;
76e21053
EH		 637 case IP_UNICAST_IF:
638 {
639 struct net_device *dev = NULL;
640 int ifindex;
641
642 if (optlen != sizeof(int))
643 goto e_inval;
644
645 ifindex = (__force int)ntohl((__force __be32)val);
646 if (ifindex == 0) {
647 inet->uc_index = 0;
648 err = 0;
649 break;
650 }
651
652 dev = dev_get_by_index(sock_net(sk), ifindex);
653 err = -EADDRNOTAVAIL;
654 if (!dev)
655 break;
656 dev_put(dev);
657
658 err = -EINVAL;
659 if (sk->sk_bound_dev_if)
660 break;
661
662 inet->uc_index = ifindex;
663 err = 0;
664 break;
665 }
132adf54
SH		 666 case IP_MULTICAST_IF:
667 {
668 struct ip_mreqn mreq;
669 struct net_device *dev = NULL;
670
671 if (sk->sk_type == SOCK_STREAM)
672 goto e_inval;
673 /*
674 * Check the arguments are allowable
675 */
676
0915921b
SW		 677 if (optlen < sizeof(struct in_addr))
678 goto e_inval;
679
132adf54
SH		 680 err = -EFAULT;
681 if (optlen >= sizeof(struct ip_mreqn)) {
09cb105e 682 if (copy_from_user(&mreq, optval, sizeof(mreq)))
1da177e4 683 break;
132adf54
SH		 684 } else {
685 memset(&mreq, 0, sizeof(mreq));
3a084ddb
JP		 686 if (optlen >= sizeof(struct ip_mreq)) {
687 if (copy_from_user(&mreq, optval,
688 sizeof(struct ip_mreq)))
689 break;
690 } else if (optlen >= sizeof(struct in_addr)) {
691 if (copy_from_user(&mreq.imr_address, optval,
692 sizeof(struct in_addr)))
693 break;
694 }
132adf54
SH		 695 }
696
697 if (!mreq.imr_ifindex) {
e6f1cebf 698 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) {
132adf54
SH		 699 inet->mc_index = 0;
700 inet->mc_addr = 0;
701 err = 0;
1da177e4
LT		 702 break;
703 }
3b1e0a65 704 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr);
55b80503 705 if (dev)
132adf54 706 mreq.imr_ifindex = dev->ifindex;
132adf54 707 } else
55b80503 708 dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex);
1da177e4 709
1da177e4 710
132adf54
SH		 711 err = -EADDRNOTAVAIL;
712 if (!dev)
713 break;
55b80503 714 dev_put(dev);
132adf54
SH		 715
716 err = -EINVAL;
717 if (sk->sk_bound_dev_if &&
718 mreq.imr_ifindex != sk->sk_bound_dev_if)
719 break;
1da177e4 720
132adf54
SH		 721 inet->mc_index = mreq.imr_ifindex;
722 inet->mc_addr = mreq.imr_address.s_addr;
723 err = 0;
724 break;
725 }
1da177e4 726
132adf54
SH		 727 case IP_ADD_MEMBERSHIP:
728 case IP_DROP_MEMBERSHIP:
729 {
730 struct ip_mreqn mreq;
1da177e4 731
a96fb49b
FL		 732 err = -EPROTO;
733 if (inet_sk(sk)->is_icsk)
734 break;
735
132adf54
SH		 736 if (optlen < sizeof(struct ip_mreq))
737 goto e_inval;
738 err = -EFAULT;
739 if (optlen >= sizeof(struct ip_mreqn)) {
09cb105e 740 if (copy_from_user(&mreq, optval, sizeof(mreq)))
1da177e4 741 break;
132adf54
SH		 742 } else {
743 memset(&mreq, 0, sizeof(mreq));
09cb105e 744 if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq)))
1da177e4 745 break;
132adf54 746 }
1da177e4 747
132adf54
SH		 748 if (optname == IP_ADD_MEMBERSHIP)
749 err = ip_mc_join_group(sk, &mreq);
750 else
751 err = ip_mc_leave_group(sk, &mreq);
752 break;
753 }
754 case IP_MSFILTER:
755 {
132adf54
SH		 756 struct ip_msfilter *msf;
757
758 if (optlen < IP_MSFILTER_SIZE(0))
759 goto e_inval;
760 if (optlen > sysctl_optmem_max) {
761 err = -ENOBUFS;
1da177e4
LT		 762 break;
763 }
132adf54 764 msf = kmalloc(optlen, GFP_KERNEL);
cfcabdcc 765 if (!msf) {
132adf54
SH		 766 err = -ENOBUFS;
767 break;
768 }
769 err = -EFAULT;
770 if (copy_from_user(msf, optval, optlen)) {
771 kfree(msf);
772 break;
773 }
774 /* numsrc >= (1G-4) overflow in 32 bits */
775 if (msf->imsf_numsrc >= 0x3ffffffcU ||
776 msf->imsf_numsrc > sysctl_igmp_max_msf) {
777 kfree(msf);
778 err = -ENOBUFS;
779 break;
780 }
781 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
782 kfree(msf);
783 err = -EINVAL;
784 break;
785 }
786 err = ip_mc_msfilter(sk, msf, 0);
787 kfree(msf);
788 break;
789 }
790 case IP_BLOCK_SOURCE:
791 case IP_UNBLOCK_SOURCE:
792 case IP_ADD_SOURCE_MEMBERSHIP:
793 case IP_DROP_SOURCE_MEMBERSHIP:
794 {
795 struct ip_mreq_source mreqs;
796 int omode, add;
1da177e4 797
132adf54
SH		 798 if (optlen != sizeof(struct ip_mreq_source))
799 goto e_inval;
800 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
1da177e4 801 err = -EFAULT;
1da177e4
LT		 802 break;
803 }
132adf54
SH		 804 if (optname == IP_BLOCK_SOURCE) {
805 omode = MCAST_EXCLUDE;
806 add = 1;
807 } else if (optname == IP_UNBLOCK_SOURCE) {
808 omode = MCAST_EXCLUDE;
809 add = 0;
810 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
811 struct ip_mreqn mreq;
1da177e4 812
132adf54
SH		 813 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
814 mreq.imr_address.s_addr = mreqs.imr_interface;
815 mreq.imr_ifindex = 0;
816 err = ip_mc_join_group(sk, &mreq);
817 if (err && err != -EADDRINUSE)
1da177e4 818 break;
132adf54
SH		 819 omode = MCAST_INCLUDE;
820 add = 1;
821 } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
822 omode = MCAST_INCLUDE;
823 add = 0;
824 }
825 err = ip_mc_source(add, omode, sk, &mreqs, 0);
826 break;
827 }
828 case MCAST_JOIN_GROUP:
829 case MCAST_LEAVE_GROUP:
830 {
831 struct group_req greq;
832 struct sockaddr_in *psin;
833 struct ip_mreqn mreq;
834
835 if (optlen < sizeof(struct group_req))
836 goto e_inval;
837 err = -EFAULT;
838 if (copy_from_user(&greq, optval, sizeof(greq)))
839 break;
840 psin = (struct sockaddr_in *)&greq.gr_group;
841 if (psin->sin_family != AF_INET)
842 goto e_inval;
843 memset(&mreq, 0, sizeof(mreq));
844 mreq.imr_multiaddr = psin->sin_addr;
845 mreq.imr_ifindex = greq.gr_interface;
846
847 if (optname == MCAST_JOIN_GROUP)
848 err = ip_mc_join_group(sk, &mreq);
849 else
850 err = ip_mc_leave_group(sk, &mreq);
851 break;
852 }
853 case MCAST_JOIN_SOURCE_GROUP:
854 case MCAST_LEAVE_SOURCE_GROUP:
855 case MCAST_BLOCK_SOURCE:
856 case MCAST_UNBLOCK_SOURCE:
857 {
858 struct group_source_req greqs;
859 struct ip_mreq_source mreqs;
860 struct sockaddr_in *psin;
861 int omode, add;
862
863 if (optlen != sizeof(struct group_source_req))
864 goto e_inval;
865 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
1da177e4 866 err = -EFAULT;
1da177e4
LT		 867 break;
868 }
132adf54
SH		 869 if (greqs.gsr_group.ss_family != AF_INET ||
870 greqs.gsr_source.ss_family != AF_INET) {
871 err = -EADDRNOTAVAIL;
1da177e4
LT		 872 break;
873 }
132adf54
SH		 874 psin = (struct sockaddr_in *)&greqs.gsr_group;
875 mreqs.imr_multiaddr = psin->sin_addr.s_addr;
876 psin = (struct sockaddr_in *)&greqs.gsr_source;
877 mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
878 mreqs.imr_interface = 0; /* use index for mc_source */
879
880 if (optname == MCAST_BLOCK_SOURCE) {
881 omode = MCAST_EXCLUDE;
882 add = 1;
883 } else if (optname == MCAST_UNBLOCK_SOURCE) {
884 omode = MCAST_EXCLUDE;
885 add = 0;
886 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
1da177e4
LT		 887 struct ip_mreqn mreq;
888
132adf54 889 psin = (struct sockaddr_in *)&greqs.gsr_group;
1da177e4 890 mreq.imr_multiaddr = psin->sin_addr;
132adf54
SH		 891 mreq.imr_address.s_addr = 0;
892 mreq.imr_ifindex = greqs.gsr_interface;
893 err = ip_mc_join_group(sk, &mreq);
894 if (err && err != -EADDRINUSE)
895 break;
896 greqs.gsr_interface = mreq.imr_ifindex;
897 omode = MCAST_INCLUDE;
898 add = 1;
899 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
900 omode = MCAST_INCLUDE;
901 add = 0;
902 }
903 err = ip_mc_source(add, omode, sk, &mreqs,
904 greqs.gsr_interface);
905 break;
906 }
907 case MCAST_MSFILTER:
908 {
132adf54
SH		 909 struct sockaddr_in *psin;
910 struct ip_msfilter *msf = NULL;
911 struct group_filter *gsf = NULL;
912 int msize, i, ifindex;
913
914 if (optlen < GROUP_FILTER_SIZE(0))
915 goto e_inval;
916 if (optlen > sysctl_optmem_max) {
917 err = -ENOBUFS;
1da177e4
LT		 918 break;
919 }
09cb105e 920 gsf = kmalloc(optlen, GFP_KERNEL);
cfcabdcc 921 if (!gsf) {
132adf54 922 err = -ENOBUFS;
1da177e4
LT		 923 break;
924 }
132adf54 925 err = -EFAULT;
4d52cfbe 926 if (copy_from_user(gsf, optval, optlen))
132adf54 927 goto mc_msf_out;
4d52cfbe 928
132adf54
SH		 929 /* numsrc >= (4G-140)/128 overflow in 32 bits */
930 if (gsf->gf_numsrc >= 0x1ffffff ||
931 gsf->gf_numsrc > sysctl_igmp_max_msf) {
932 err = -ENOBUFS;
933 goto mc_msf_out;
934 }
935 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
936 err = -EINVAL;
937 goto mc_msf_out;
938 }
939 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
09cb105e 940 msf = kmalloc(msize, GFP_KERNEL);
cfcabdcc 941 if (!msf) {
132adf54
SH		 942 err = -ENOBUFS;
943 goto mc_msf_out;
944 }
945 ifindex = gsf->gf_interface;
946 psin = (struct sockaddr_in *)&gsf->gf_group;
947 if (psin->sin_family != AF_INET) {
1da177e4 948 err = -EADDRNOTAVAIL;
132adf54 949 goto mc_msf_out;
1da177e4 950 }
132adf54
SH		 951 msf->imsf_multiaddr = psin->sin_addr.s_addr;
952 msf->imsf_interface = 0;
953 msf->imsf_fmode = gsf->gf_fmode;
954 msf->imsf_numsrc = gsf->gf_numsrc;
955 err = -EADDRNOTAVAIL;
4d52cfbe 956 for (i = 0; i < gsf->gf_numsrc; ++i) {
132adf54 957 psin = (struct sockaddr_in *)&gsf->gf_slist[i];
e905a9ed 958
132adf54
SH		 959 if (psin->sin_family != AF_INET)
960 goto mc_msf_out;
961 msf->imsf_slist[i] = psin->sin_addr.s_addr;
962 }
963 kfree(gsf);
964 gsf = NULL;
965
966 err = ip_mc_msfilter(sk, msf, ifindex);
4d52cfbe 967mc_msf_out:
132adf54
SH		 968 kfree(msf);
969 kfree(gsf);
970 break;
971 }
f771bef9
NS		 972 case IP_MULTICAST_ALL:
973 if (optlen < 1)
974 goto e_inval;
975 if (val != 0 && val != 1)
976 goto e_inval;
977 inet->mc_all = val;
978 break;
132adf54
SH		 979 case IP_ROUTER_ALERT:
980 err = ip_ra_control(sk, val ? 1 : 0, NULL);
981 break;
982
983 case IP_FREEBIND:
4d52cfbe 984 if (optlen < 1)
132adf54
SH		 985 goto e_inval;
986 inet->freebind = !!val;
987 break;
988
989 case IP_IPSEC_POLICY:
990 case IP_XFRM_POLICY:
991 err = -EPERM;
52e804c6 992 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1da177e4 993 break;
132adf54
SH		 994 err = xfrm_user_policy(sk, optname, optval, optlen);
995 break;
1da177e4 996
f5715aea 997 case IP_TRANSPARENT:
52e804c6
EB		 998 if (!!val && !ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) &&
999 !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
f5715aea
KK		 1000 err = -EPERM;
1001 break;
1002 }
1003 if (optlen < 1)
1004 goto e_inval;
1005 inet->transparent = !!val;
1006 break;
1007
d218d111
SH		 1008 case IP_MINTTL:
1009 if (optlen < 1)
1010 goto e_inval;
1011 if (val < 0 || val > 255)
1012 goto e_inval;
1013 inet->min_ttl = val;
1014 break;
1015
132adf54
SH		 1016 default:
1017 err = -ENOPROTOOPT;
1018 break;
1da177e4
LT		 1019 }
1020 release_sock(sk);
1021 return err;
1022
1023e_inval:
1024 release_sock(sk);
1025 return -EINVAL;
1026}
1027
f84af32c 1028/**
d826eb14 1029 * ipv4_pktinfo_prepare - transfert some info from rtable to skb
f84af32c
ED		 1030 * @sk: socket
1031 * @skb: buffer
1032 *
35ebf65e
DM		 1033 * To support IP_CMSG_PKTINFO option, we store rt_iif and specific
1034 * destination in skb->cb[] before dst drop.
d826eb14 1035 * This way, receiver doesnt make cache line misses to read rtable.
f84af32c 1036 */
d826eb14 1037void ipv4_pktinfo_prepare(struct sk_buff *skb)
f84af32c 1038{
d826eb14 1039 struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb);
d826eb14 1040
92101b3b
DM		 1041 if (skb_rtable(skb)) {
1042 pktinfo->ipi_ifindex = inet_iif(skb);
35ebf65e 1043 pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb);
d826eb14
ED		 1044 } else {
1045 pktinfo->ipi_ifindex = 0;
1046 pktinfo->ipi_spec_dst.s_addr = 0;
1047 }
1048 skb_dst_drop(skb);
f84af32c 1049}
f84af32c 1050
3fdadf7d 1051int ip_setsockopt(struct sock *sk, int level,
b7058842 1052 int optname, char __user *optval, unsigned int optlen)
3fdadf7d
DM		 1053{
1054 int err;
1055
1056 if (level != SOL_IP)
1057 return -ENOPROTOOPT;
1058
1059 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1060#ifdef CONFIG_NETFILTER
1061 /* we need to exclude all possible ENOPROTOOPTs except default case */
1062 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
6a9fb947
PE		 1063 optname != IP_IPSEC_POLICY &&
1064 optname != IP_XFRM_POLICY &&
1065 !ip_mroute_opt(optname)) {
3fdadf7d
DM		 1066 lock_sock(sk);
1067 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
1068 release_sock(sk);
1069 }
1070#endif
1071 return err;
1072}
4d52cfbe 1073EXPORT_SYMBOL(ip_setsockopt);
3fdadf7d
DM		 1074
1075#ifdef CONFIG_COMPAT
543d9cfe 1076int compat_ip_setsockopt(struct sock *sk, int level, int optname,
b7058842 1077 char __user *optval, unsigned int optlen)
3fdadf7d
DM		 1078{
1079 int err;
1080
1081 if (level != SOL_IP)
1082 return -ENOPROTOOPT;
1083
dae50295
DS		 1084 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
1085 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
1086 ip_setsockopt);
1087
3fdadf7d
DM		 1088 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1089#ifdef CONFIG_NETFILTER
1090 /* we need to exclude all possible ENOPROTOOPTs except default case */
1091 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
6a9fb947
PE		 1092 optname != IP_IPSEC_POLICY &&
1093 optname != IP_XFRM_POLICY &&
1094 !ip_mroute_opt(optname)) {
3fdadf7d 1095 lock_sock(sk);
543d9cfe
ACM		 1096 err = compat_nf_setsockopt(sk, PF_INET, optname,
1097 optval, optlen);
3fdadf7d
DM		 1098 release_sock(sk);
1099 }
1100#endif
1101 return err;
1102}
543d9cfe 1103EXPORT_SYMBOL(compat_ip_setsockopt);
3fdadf7d
DM		 1104#endif
1105
1da177e4 1106/*
4d52cfbe
ED		 1107 * Get the options. Note for future reference. The GET of IP options gets
1108 * the _received_ ones. The set sets the _sent_ ones.
1da177e4
LT		 1109 */
1110
3fdadf7d 1111static int do_ip_getsockopt(struct sock *sk, int level, int optname,
95c96174 1112 char __user *optval, int __user *optlen, unsigned int flags)
1da177e4
LT		 1113{
1114 struct inet_sock *inet = inet_sk(sk);
1115 int val;
1116 int len;
e905a9ed 1117
132adf54 1118 if (level != SOL_IP)
1da177e4
LT		 1119 return -EOPNOTSUPP;
1120
6a9fb947 1121 if (ip_mroute_opt(optname))
09cb105e 1122 return ip_mroute_getsockopt(sk, optname, optval, optlen);
1da177e4 1123
09cb105e 1124 if (get_user(len, optlen))
1da177e4 1125 return -EFAULT;
132adf54 1126 if (len < 0)
1da177e4 1127 return -EINVAL;
e905a9ed 1128
1da177e4
LT		 1129 lock_sock(sk);
1130
132adf54
SH		 1131 switch (optname) {
1132 case IP_OPTIONS:
1133 {
1134 unsigned char optbuf[sizeof(struct ip_options)+40];
f6d8bd05
ED		 1135 struct ip_options *opt = (struct ip_options *)optbuf;
1136 struct ip_options_rcu *inet_opt;
1137
1138 inet_opt = rcu_dereference_protected(inet->inet_opt,
1139 sock_owned_by_user(sk));
132adf54 1140 opt->optlen = 0;
f6d8bd05
ED		 1141 if (inet_opt)
1142 memcpy(optbuf, &inet_opt->opt,
1143 sizeof(struct ip_options) +
1144 inet_opt->opt.optlen);
132adf54
SH		 1145 release_sock(sk);
1146
1147 if (opt->optlen == 0)
1148 return put_user(0, optlen);
1149
1150 ip_options_undo(opt);
1151
1152 len = min_t(unsigned int, len, opt->optlen);
1153 if (put_user(len, optlen))
1154 return -EFAULT;
1155 if (copy_to_user(optval, opt->__data, len))
1156 return -EFAULT;
1157 return 0;
1158 }
1159 case IP_PKTINFO:
1160 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
1161 break;
1162 case IP_RECVTTL:
1163 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
1164 break;
1165 case IP_RECVTOS:
1166 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
1167 break;
1168 case IP_RECVOPTS:
1169 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
1170 break;
1171 case IP_RETOPTS:
1172 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
1173 break;
1174 case IP_PASSSEC:
1175 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
1176 break;
e8b2dfe9
BS		 1177 case IP_RECVORIGDSTADDR:
1178 val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0;
1179 break;
132adf54
SH		 1180 case IP_TOS:
1181 val = inet->tos;
1182 break;
1183 case IP_TTL:
1184 val = (inet->uc_ttl == -1 ?
1185 sysctl_ip_default_ttl :
1186 inet->uc_ttl);
1187 break;
1188 case IP_HDRINCL:
1189 val = inet->hdrincl;
1190 break;
a89b4763
MK		 1191 case IP_NODEFRAG:
1192 val = inet->nodefrag;
1193 break;
132adf54
SH		 1194 case IP_MTU_DISCOVER:
1195 val = inet->pmtudisc;
1196 break;
1197 case IP_MTU:
1198 {
1199 struct dst_entry *dst;
1200 val = 0;
1201 dst = sk_dst_get(sk);
1202 if (dst) {
1203 val = dst_mtu(dst);
1204 dst_release(dst);
1da177e4 1205 }
132adf54 1206 if (!val) {
1da177e4 1207 release_sock(sk);
132adf54 1208 return -ENOTCONN;
1da177e4 1209 }
132adf54
SH		 1210 break;
1211 }
1212 case IP_RECVERR:
1213 val = inet->recverr;
1214 break;
1215 case IP_MULTICAST_TTL:
1216 val = inet->mc_ttl;
1217 break;
1218 case IP_MULTICAST_LOOP:
1219 val = inet->mc_loop;
1220 break;
76e21053
EH		 1221 case IP_UNICAST_IF:
1222 val = (__force int)htonl((__u32) inet->uc_index);
1223 break;
132adf54
SH		 1224 case IP_MULTICAST_IF:
1225 {
1226 struct in_addr addr;
1227 len = min_t(unsigned int, len, sizeof(struct in_addr));
1228 addr.s_addr = inet->mc_addr;
1229 release_sock(sk);
1da177e4 1230
132adf54
SH		 1231 if (put_user(len, optlen))
1232 return -EFAULT;
1233 if (copy_to_user(optval, &addr, len))
1234 return -EFAULT;
1235 return 0;
1236 }
1237 case IP_MSFILTER:
1238 {
1239 struct ip_msfilter msf;
1240 int err;
1241
1242 if (len < IP_MSFILTER_SIZE(0)) {
1da177e4 1243 release_sock(sk);
132adf54 1244 return -EINVAL;
1da177e4 1245 }
132adf54 1246 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
1da177e4 1247 release_sock(sk);
132adf54 1248 return -EFAULT;
1da177e4 1249 }
132adf54
SH		 1250 err = ip_mc_msfget(sk, &msf,
1251 (struct ip_msfilter __user *)optval, optlen);
1252 release_sock(sk);
1253 return err;
1254 }
1255 case MCAST_MSFILTER:
1256 {
1257 struct group_filter gsf;
1258 int err;
1da177e4 1259
132adf54 1260 if (len < GROUP_FILTER_SIZE(0)) {
1da177e4 1261 release_sock(sk);
132adf54
SH		 1262 return -EINVAL;
1263 }
1264 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
1265 release_sock(sk);
1266 return -EFAULT;
1267 }
1268 err = ip_mc_gsfget(sk, &gsf,
4d52cfbe
ED		 1269 (struct group_filter __user *)optval,
1270 optlen);
132adf54
SH		 1271 release_sock(sk);
1272 return err;
1273 }
f771bef9
NS		 1274 case IP_MULTICAST_ALL:
1275 val = inet->mc_all;
1276 break;
132adf54
SH		 1277 case IP_PKTOPTIONS:
1278 {
1279 struct msghdr msg;
1da177e4 1280
132adf54 1281 release_sock(sk);
1da177e4 1282
132adf54
SH		 1283 if (sk->sk_type != SOCK_STREAM)
1284 return -ENOPROTOOPT;
1da177e4 1285
132adf54
SH		 1286 msg.msg_control = optval;
1287 msg.msg_controllen = len;
dd23198e 1288 msg.msg_flags = flags;
1da177e4 1289
132adf54
SH		 1290 if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
1291 struct in_pktinfo info;
1292
c720c7e8
ED		 1293 info.ipi_addr.s_addr = inet->inet_rcv_saddr;
1294 info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr;
132adf54
SH		 1295 info.ipi_ifindex = inet->mc_index;
1296 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
1da177e4 1297 }
132adf54
SH		 1298 if (inet->cmsg_flags & IP_CMSG_TTL) {
1299 int hlim = inet->mc_ttl;
1300 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
1301 }
4c507d28
JB		 1302 if (inet->cmsg_flags & IP_CMSG_TOS) {
1303 int tos = inet->rcv_tos;
1304 put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos);
1305 }
132adf54
SH		 1306 len -= msg.msg_controllen;
1307 return put_user(len, optlen);
1308 }
1309 case IP_FREEBIND:
1310 val = inet->freebind;
1311 break;
f5715aea
KK		 1312 case IP_TRANSPARENT:
1313 val = inet->transparent;
1314 break;
d218d111
SH		 1315 case IP_MINTTL:
1316 val = inet->min_ttl;
1317 break;
132adf54
SH		 1318 default:
1319 release_sock(sk);
1320 return -ENOPROTOOPT;
1da177e4
LT		 1321 }
1322 release_sock(sk);
e905a9ed 1323
4d52cfbe 1324 if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) {
1da177e4
LT		 1325 unsigned char ucval = (unsigned char)val;
1326 len = 1;
132adf54 1327 if (put_user(len, optlen))
1da177e4 1328 return -EFAULT;
09cb105e 1329 if (copy_to_user(optval, &ucval, 1))
1da177e4
LT		 1330 return -EFAULT;
1331 } else {
1332 len = min_t(unsigned int, sizeof(int), len);
132adf54 1333 if (put_user(len, optlen))
1da177e4 1334 return -EFAULT;
09cb105e 1335 if (copy_to_user(optval, &val, len))
1da177e4
LT		 1336 return -EFAULT;
1337 }
1338 return 0;
1339}
1340
3fdadf7d 1341int ip_getsockopt(struct sock *sk, int level,
132adf54 1342 int optname, char __user *optval, int __user *optlen)
3fdadf7d
DM		 1343{
1344 int err;
1345
dd23198e 1346 err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0);
3fdadf7d
DM		 1347#ifdef CONFIG_NETFILTER
1348 /* we need to exclude all possible ENOPROTOOPTs except default case */
6a9fb947
PE		 1349 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1350 !ip_mroute_opt(optname)) {
e905a9ed 1351 int len;
3fdadf7d 1352
09cb105e 1353 if (get_user(len, optlen))
3fdadf7d
DM		 1354 return -EFAULT;
1355
1356 lock_sock(sk);
1357 err = nf_getsockopt(sk, PF_INET, optname, optval,
1358 &len);
1359 release_sock(sk);
1360 if (err >= 0)
1361 err = put_user(len, optlen);
1362 return err;
1363 }
1364#endif
1365 return err;
1366}
4d52cfbe 1367EXPORT_SYMBOL(ip_getsockopt);
3fdadf7d
DM		 1368
1369#ifdef CONFIG_COMPAT
543d9cfe
ACM		 1370int compat_ip_getsockopt(struct sock *sk, int level, int optname,
1371 char __user *optval, int __user *optlen)
3fdadf7d 1372{
42908c69
DS		 1373 int err;
1374
1375 if (optname == MCAST_MSFILTER)
1376 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1377 ip_getsockopt);
1378
dd23198e
DB		 1379 err = do_ip_getsockopt(sk, level, optname, optval, optlen,
1380 MSG_CMSG_COMPAT);
42908c69 1381
3fdadf7d
DM		 1382#ifdef CONFIG_NETFILTER
1383 /* we need to exclude all possible ENOPROTOOPTs except default case */
6a9fb947
PE		 1384 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1385 !ip_mroute_opt(optname)) {
e905a9ed 1386 int len;
3fdadf7d 1387
543d9cfe 1388 if (get_user(len, optlen))
3fdadf7d
DM		 1389 return -EFAULT;
1390
1391 lock_sock(sk);
543d9cfe 1392 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
3fdadf7d
DM		 1393 release_sock(sk);
1394 if (err >= 0)
1395 err = put_user(len, optlen);
1396 return err;
1397 }
1398#endif
1399 return err;
1400}
543d9cfe 1401EXPORT_SYMBOL(compat_ip_getsockopt);
3fdadf7d 1402#endif
kernel source for telekom puls (alcatel/mediatek)