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ipv4: warn once on passing AF_INET6 socket to ip_recv_error
[mirror_ubuntu-hirsute-kernel.git] / net / ipv4 / ip_sockglue.c
CommitLineData
1da177e4
LT		 1/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * The IP to API glue.
e905a9ed 7 *
1da177e4
LT		 8 * Authors: see ip.c
9 *
10 * Fixes:
11 * Many : Split from ip.c , see ip.c for history.
12 * Martin Mares : TOS setting fixed.
e905a9ed 13 * Alan Cox : Fixed a couple of oopses in Martin's
1da177e4
LT		 14 * TOS tweaks.
15 * Mike McLagan : Routing by source
16 */
17
1da177e4
LT		 18#include <linux/module.h>
19#include <linux/types.h>
20#include <linux/mm.h>
1da177e4
LT		 21#include <linux/skbuff.h>
22#include <linux/ip.h>
23#include <linux/icmp.h>
14c85021 24#include <linux/inetdevice.h>
1da177e4 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 */
59
60static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb)
61{
d826eb14 62 struct in_pktinfo info = *PKTINFO_SKB_CB(skb);
1da177e4 63
eddc9ec5 64 info.ipi_addr.s_addr = ip_hdr(skb)->daddr;
1da177e4
LT		 65
66 put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
67}
68
69static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb)
70{
eddc9ec5 71 int ttl = ip_hdr(skb)->ttl;
1da177e4
LT		 72 put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl);
73}
74
75static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb)
76{
eddc9ec5 77 put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos);
1da177e4
LT		 78}
79
80static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb)
81{
82 if (IPCB(skb)->opt.optlen == 0)
83 return;
84
eddc9ec5
ACM		 85 put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen,
86 ip_hdr(skb) + 1);
1da177e4
LT		 87}
88
89
90static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb)
91{
92 unsigned char optbuf[sizeof(struct ip_options) + 40];
5e73ea1a 93 struct ip_options *opt = (struct ip_options *)optbuf;
1da177e4
LT		 94
95 if (IPCB(skb)->opt.optlen == 0)
96 return;
97
98 if (ip_options_echo(opt, skb)) {
99 msg->msg_flags |= MSG_CTRUNC;
100 return;
101 }
102 ip_options_undo(opt);
103
104 put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data);
105}
106
2c7946a7
CZ		 107static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
108{
109 char *secdata;
dc49c1f9 110 u32 seclen, secid;
2c7946a7
CZ		 111 int err;
112
dc49c1f9
CZ		 113 err = security_socket_getpeersec_dgram(NULL, skb, &secid);
114 if (err)
115 return;
116
117 err = security_secid_to_secctx(secid, &secdata, &seclen);
2c7946a7
CZ		 118 if (err)
119 return;
120
121 put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata);
dc49c1f9 122 security_release_secctx(secdata, seclen);
2c7946a7
CZ		 123}
124
21d1a161 125static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb)
e8b2dfe9
BS		 126{
127 struct sockaddr_in sin;
b71d1d42 128 const struct iphdr *iph = ip_hdr(skb);
21d1a161 129 __be16 *ports = (__be16 *)skb_transport_header(skb);
e8b2dfe9
BS		 130
131 if (skb_transport_offset(skb) + 4 > skb->len)
132 return;
133
134 /* All current transport protocols have the port numbers in the
135 * first four bytes of the transport header and this function is
136 * written with this assumption in mind.
137 */
138
139 sin.sin_family = AF_INET;
140 sin.sin_addr.s_addr = iph->daddr;
141 sin.sin_port = ports[1];
142 memset(sin.sin_zero, 0, sizeof(sin.sin_zero));
143
144 put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin);
145}
1da177e4
LT		 146
147void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
148{
149 struct inet_sock *inet = inet_sk(skb->sk);
95c96174 150 unsigned int flags = inet->cmsg_flags;
1da177e4
LT		 151
152 /* Ordered by supposed usage frequency */
153 if (flags & 1)
154 ip_cmsg_recv_pktinfo(msg, skb);
4d52cfbe 155 if ((flags >>= 1) == 0)
1da177e4
LT		 156 return;
157
158 if (flags & 1)
159 ip_cmsg_recv_ttl(msg, skb);
4d52cfbe 160 if ((flags >>= 1) == 0)
1da177e4
LT		 161 return;
162
163 if (flags & 1)
164 ip_cmsg_recv_tos(msg, skb);
4d52cfbe 165 if ((flags >>= 1) == 0)
1da177e4
LT		 166 return;
167
168 if (flags & 1)
169 ip_cmsg_recv_opts(msg, skb);
4d52cfbe 170 if ((flags >>= 1) == 0)
1da177e4
LT		 171 return;
172
173 if (flags & 1)
174 ip_cmsg_recv_retopts(msg, skb);
4d52cfbe 175 if ((flags >>= 1) == 0)
2c7946a7
CZ		 176 return;
177
178 if (flags & 1)
179 ip_cmsg_recv_security(msg, skb);
e8b2dfe9 180
4d52cfbe 181 if ((flags >>= 1) == 0)
e8b2dfe9
BS		 182 return;
183 if (flags & 1)
184 ip_cmsg_recv_dstaddr(msg, skb);
185
1da177e4 186}
4d52cfbe 187EXPORT_SYMBOL(ip_cmsg_recv);
1da177e4 188
c8e6ad08
HFS		 189int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc,
190 bool allow_ipv6)
1da177e4 191{
f02db315 192 int err, val;
1da177e4
LT		 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;
5337b5b7 198#if IS_ENABLED(CONFIG_IPV6)
c8e6ad08
HFS		 199 if (allow_ipv6 &&
200 cmsg->cmsg_level == SOL_IPV6 &&
201 cmsg->cmsg_type == IPV6_PKTINFO) {
202 struct in6_pktinfo *src_info;
203
204 if (cmsg->cmsg_len < CMSG_LEN(sizeof(*src_info)))
205 return -EINVAL;
206 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
207 if (!ipv6_addr_v4mapped(&src_info->ipi6_addr))
208 return -EINVAL;
209 ipc->oif = src_info->ipi6_ifindex;
210 ipc->addr = src_info->ipi6_addr.s6_addr32[3];
211 continue;
212 }
213#endif
1da177e4
LT		 214 if (cmsg->cmsg_level != SOL_IP)
215 continue;
216 switch (cmsg->cmsg_type) {
217 case IP_RETOPTS:
218 err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
4d52cfbe
ED		 219 err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg),
220 err < 40 ? err : 40);
1da177e4
LT		 221 if (err)
222 return err;
223 break;
224 case IP_PKTINFO:
225 {
226 struct in_pktinfo *info;
227 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
228 return -EINVAL;
229 info = (struct in_pktinfo *)CMSG_DATA(cmsg);
230 ipc->oif = info->ipi_ifindex;
231 ipc->addr = info->ipi_spec_dst.s_addr;
232 break;
233 }
f02db315
FF		 234 case IP_TTL:
235 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
236 return -EINVAL;
237 val = *(int *)CMSG_DATA(cmsg);
238 if (val < 1 || val > 255)
239 return -EINVAL;
240 ipc->ttl = val;
241 break;
242 case IP_TOS:
243 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
244 return -EINVAL;
245 val = *(int *)CMSG_DATA(cmsg);
246 if (val < 0 || val > 255)
247 return -EINVAL;
248 ipc->tos = val;
249 ipc->priority = rt_tos2priority(ipc->tos);
250 break;
251
1da177e4
LT		 252 default:
253 return -EINVAL;
254 }
255 }
256 return 0;
257}
258
259
260/* Special input handler for packets caught by router alert option.
261 They are selected only by protocol field, and then processed likely
262 local ones; but only if someone wants them! Otherwise, router
263 not running rsvpd will kill RSVP.
264
265 It is user level problem, what it will make with them.
266 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
267 but receiver should be enough clever f.e. to forward mtrace requests,
268 sent to multicast group to reach destination designated router.
269 */
43a951e9 270struct ip_ra_chain __rcu *ip_ra_chain;
66018506
ED		 271static DEFINE_SPINLOCK(ip_ra_lock);
272
592fcb9d
ED		 273
274static void ip_ra_destroy_rcu(struct rcu_head *head)
66018506 275{
592fcb9d
ED		 276 struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu);
277
278 sock_put(ra->saved_sk);
279 kfree(ra);
66018506 280}
1da177e4 281
4d52cfbe
ED		 282int ip_ra_control(struct sock *sk, unsigned char on,
283 void (*destructor)(struct sock *))
1da177e4 284{
43a951e9
ED		 285 struct ip_ra_chain *ra, *new_ra;
286 struct ip_ra_chain __rcu **rap;
1da177e4 287
c720c7e8 288 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW)
1da177e4
LT		 289 return -EINVAL;
290
291 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
292
66018506 293 spin_lock_bh(&ip_ra_lock);
43a951e9
ED		 294 for (rap = &ip_ra_chain;
295 (ra = rcu_dereference_protected(*rap,
296 lockdep_is_held(&ip_ra_lock))) != NULL;
297 rap = &ra->next) {
1da177e4
LT		 298 if (ra->sk == sk) {
299 if (on) {
66018506 300 spin_unlock_bh(&ip_ra_lock);
a51482bd 301 kfree(new_ra);
1da177e4
LT		 302 return -EADDRINUSE;
303 }
592fcb9d
ED		 304 /* dont let ip_call_ra_chain() use sk again */
305 ra->sk = NULL;
8e380f00 306 RCU_INIT_POINTER(*rap, ra->next);
66018506 307 spin_unlock_bh(&ip_ra_lock);
1da177e4
LT		 308
309 if (ra->destructor)
310 ra->destructor(sk);
592fcb9d
ED		 311 /*
312 * Delay sock_put(sk) and kfree(ra) after one rcu grace
313 * period. This guarantee ip_call_ra_chain() dont need
314 * to mess with socket refcounts.
315 */
316 ra->saved_sk = sk;
317 call_rcu(&ra->rcu, ip_ra_destroy_rcu);
1da177e4
LT		 318 return 0;
319 }
320 }
321 if (new_ra == NULL) {
66018506 322 spin_unlock_bh(&ip_ra_lock);
1da177e4
LT		 323 return -ENOBUFS;
324 }
325 new_ra->sk = sk;
326 new_ra->destructor = destructor;
327
8e380f00 328 RCU_INIT_POINTER(new_ra->next, ra);
66018506 329 rcu_assign_pointer(*rap, new_ra);
1da177e4 330 sock_hold(sk);
66018506 331 spin_unlock_bh(&ip_ra_lock);
1da177e4
LT		 332
333 return 0;
334}
335
e905a9ed 336void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
35986b32 337 __be16 port, u32 info, u8 *payload)
1da177e4 338{
1da177e4
LT		 339 struct sock_exterr_skb *serr;
340
1da177e4
LT		 341 skb = skb_clone(skb, GFP_ATOMIC);
342 if (!skb)
343 return;
344
e905a9ed 345 serr = SKB_EXT_ERR(skb);
1da177e4
LT		 346 serr->ee.ee_errno = err;
347 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
88c7664f
ACM		 348 serr->ee.ee_type = icmp_hdr(skb)->type;
349 serr->ee.ee_code = icmp_hdr(skb)->code;
1da177e4
LT		 350 serr->ee.ee_pad = 0;
351 serr->ee.ee_info = info;
352 serr->ee.ee_data = 0;
88c7664f 353 serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) -
d56f90a7 354 skb_network_header(skb);
1da177e4
LT		 355 serr->port = port;
356
bd82393c
ACM		 357 if (skb_pull(skb, payload - skb->data) != NULL) {
358 skb_reset_transport_header(skb);
359 if (sock_queue_err_skb(sk, skb) == 0)
360 return;
361 }
362 kfree_skb(skb);
1da177e4
LT		 363}
364
0579016e 365void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info)
1da177e4
LT		 366{
367 struct inet_sock *inet = inet_sk(sk);
368 struct sock_exterr_skb *serr;
369 struct iphdr *iph;
370 struct sk_buff *skb;
371
372 if (!inet->recverr)
373 return;
374
375 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
376 if (!skb)
377 return;
378
2ca9e6f2
ACM		 379 skb_put(skb, sizeof(struct iphdr));
380 skb_reset_network_header(skb);
eddc9ec5 381 iph = ip_hdr(skb);
1da177e4
LT		 382 iph->daddr = daddr;
383
e905a9ed 384 serr = SKB_EXT_ERR(skb);
1da177e4
LT		 385 serr->ee.ee_errno = err;
386 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
e905a9ed 387 serr->ee.ee_type = 0;
1da177e4
LT		 388 serr->ee.ee_code = 0;
389 serr->ee.ee_pad = 0;
390 serr->ee.ee_info = info;
391 serr->ee.ee_data = 0;
d56f90a7 392 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
1da177e4
LT		 393 serr->port = port;
394
27a884dc 395 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
bd82393c 396 skb_reset_transport_header(skb);
1da177e4
LT		 397
398 if (sock_queue_err_skb(sk, skb))
399 kfree_skb(skb);
400}
401
e905a9ed 402/*
1da177e4
LT		 403 * Handle MSG_ERRQUEUE
404 */
85fbaa75 405int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
1da177e4
LT		 406{
407 struct sock_exterr_skb *serr;
364a9e93 408 struct sk_buff *skb;
342dfc30 409 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name);
1da177e4
LT		 410 struct {
411 struct sock_extended_err ee;
412 struct sockaddr_in offender;
413 } errhdr;
414 int err;
415 int copied;
416
7ce875e5
WB		 417 WARN_ON_ONCE(sk->sk_family == AF_INET6);
418
1da177e4 419 err = -EAGAIN;
364a9e93 420 skb = sock_dequeue_err_skb(sk);
1da177e4
LT		 421 if (skb == NULL)
422 goto out;
423
424 copied = skb->len;
425 if (copied > len) {
426 msg->msg_flags |= MSG_TRUNC;
427 copied = len;
428 }
51f3d02b 429 err = skb_copy_datagram_msg(skb, 0, msg, copied);
1da177e4
LT		 430 if (err)
431 goto out_free_skb;
432
433 sock_recv_timestamp(msg, sk, skb);
434
435 serr = SKB_EXT_ERR(skb);
436
1da177e4
LT		 437 if (sin) {
438 sin->sin_family = AF_INET;
d56f90a7
ACM		 439 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) +
440 serr->addr_offset);
1da177e4
LT		 441 sin->sin_port = serr->port;
442 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
85fbaa75 443 *addr_len = sizeof(*sin);
1da177e4
LT		 444 }
445
446 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
447 sin = &errhdr.offender;
448 sin->sin_family = AF_UNSPEC;
449 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) {
450 struct inet_sock *inet = inet_sk(sk);
451
452 sin->sin_family = AF_INET;
eddc9ec5 453 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
1da177e4
LT		 454 sin->sin_port = 0;
455 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
456 if (inet->cmsg_flags)
457 ip_cmsg_recv(msg, skb);
458 }
459
460 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
461
462 /* Now we could try to dump offended packet options */
463
464 msg->msg_flags |= MSG_ERRQUEUE;
465 err = copied;
466
e905a9ed 467out_free_skb:
1da177e4
LT		 468 kfree_skb(skb);
469out:
470 return err;
471}
472
473
474/*
4d52cfbe
ED		 475 * Socket option code for IP. This is the end of the line after any
476 * TCP,UDP etc options on an IP socket.
1da177e4
LT		 477 */
478
3fdadf7d 479static int do_ip_setsockopt(struct sock *sk, int level,
b7058842 480 int optname, char __user *optval, unsigned int optlen)
1da177e4
LT		 481{
482 struct inet_sock *inet = inet_sk(sk);
09cb105e 483 int val = 0, err;
1da177e4 484
0c9f79be
XW		 485 switch (optname) {
486 case IP_PKTINFO:
487 case IP_RECVTTL:
488 case IP_RECVOPTS:
489 case IP_RECVTOS:
490 case IP_RETOPTS:
491 case IP_TOS:
492 case IP_TTL:
493 case IP_HDRINCL:
494 case IP_MTU_DISCOVER:
495 case IP_RECVERR:
496 case IP_ROUTER_ALERT:
497 case IP_FREEBIND:
498 case IP_PASSSEC:
499 case IP_TRANSPARENT:
500 case IP_MINTTL:
501 case IP_NODEFRAG:
502 case IP_UNICAST_IF:
503 case IP_MULTICAST_TTL:
504 case IP_MULTICAST_ALL:
505 case IP_MULTICAST_LOOP:
506 case IP_RECVORIGDSTADDR:
1da177e4
LT		 507 if (optlen >= sizeof(int)) {
508 if (get_user(val, (int __user *) optval))
509 return -EFAULT;
510 } else if (optlen >= sizeof(char)) {
511 unsigned char ucval;
512
513 if (get_user(ucval, (unsigned char __user *) optval))
514 return -EFAULT;
515 val = (int) ucval;
516 }
517 }
518
519 /* If optlen==0, it is equivalent to val == 0 */
520
6a9fb947 521 if (ip_mroute_opt(optname))
09cb105e 522 return ip_mroute_setsockopt(sk, optname, optval, optlen);
1da177e4
LT		 523
524 err = 0;
525 lock_sock(sk);
526
527 switch (optname) {
132adf54
SH		 528 case IP_OPTIONS:
529 {
f6d8bd05
ED		 530 struct ip_options_rcu *old, *opt = NULL;
531
65a1c4ff 532 if (optlen > 40)
132adf54 533 goto e_inval;
3b1e0a65 534 err = ip_options_get_from_user(sock_net(sk), &opt,
cb84663e 535 optval, optlen);
132adf54
SH		 536 if (err)
537 break;
f6d8bd05
ED		 538 old = rcu_dereference_protected(inet->inet_opt,
539 sock_owned_by_user(sk));
132adf54
SH		 540 if (inet->is_icsk) {
541 struct inet_connection_sock *icsk = inet_csk(sk);
dfd56b8b 542#if IS_ENABLED(CONFIG_IPV6)
132adf54
SH		 543 if (sk->sk_family == PF_INET ||
544 (!((1 << sk->sk_state) &
545 (TCPF_LISTEN | TCPF_CLOSE)) &&
c720c7e8 546 inet->inet_daddr != LOOPBACK4_IPV6)) {
1da177e4 547#endif
f6d8bd05
ED		 548 if (old)
549 icsk->icsk_ext_hdr_len -= old->opt.optlen;
132adf54 550 if (opt)
f6d8bd05 551 icsk->icsk_ext_hdr_len += opt->opt.optlen;
132adf54 552 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
dfd56b8b 553#if IS_ENABLED(CONFIG_IPV6)
1da177e4 554 }
132adf54 555#endif
1da177e4 556 }
f6d8bd05
ED		 557 rcu_assign_pointer(inet->inet_opt, opt);
558 if (old)
605b4afe 559 kfree_rcu(old, rcu);
132adf54
SH		 560 break;
561 }
562 case IP_PKTINFO:
563 if (val)
564 inet->cmsg_flags |= IP_CMSG_PKTINFO;
565 else
566 inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
567 break;
568 case IP_RECVTTL:
569 if (val)
570 inet->cmsg_flags |= IP_CMSG_TTL;
571 else
572 inet->cmsg_flags &= ~IP_CMSG_TTL;
573 break;
574 case IP_RECVTOS:
575 if (val)
576 inet->cmsg_flags |= IP_CMSG_TOS;
577 else
578 inet->cmsg_flags &= ~IP_CMSG_TOS;
579 break;
580 case IP_RECVOPTS:
581 if (val)
582 inet->cmsg_flags |= IP_CMSG_RECVOPTS;
583 else
584 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
585 break;
586 case IP_RETOPTS:
587 if (val)
588 inet->cmsg_flags |= IP_CMSG_RETOPTS;
589 else
590 inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
591 break;
592 case IP_PASSSEC:
593 if (val)
594 inet->cmsg_flags |= IP_CMSG_PASSSEC;
595 else
596 inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
597 break;
e8b2dfe9
BS		 598 case IP_RECVORIGDSTADDR:
599 if (val)
600 inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR;
601 else
602 inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR;
603 break;
132adf54
SH		 604 case IP_TOS: /* This sets both TOS and Precedence */
605 if (sk->sk_type == SOCK_STREAM) {
2c67e9ac
MŻ		 606 val &= ~INET_ECN_MASK;
607 val |= inet->tos & INET_ECN_MASK;
132adf54 608 }
132adf54
SH		 609 if (inet->tos != val) {
610 inet->tos = val;
611 sk->sk_priority = rt_tos2priority(val);
612 sk_dst_reset(sk);
613 }
614 break;
615 case IP_TTL:
4d52cfbe 616 if (optlen < 1)
132adf54 617 goto e_inval;
c9be4a5c 618 if (val != -1 && (val < 1 || val > 255))
132adf54
SH		 619 goto e_inval;
620 inet->uc_ttl = val;
621 break;
622 case IP_HDRINCL:
623 if (sk->sk_type != SOCK_RAW) {
624 err = -ENOPROTOOPT;
2c7946a7 625 break;
132adf54
SH		 626 }
627 inet->hdrincl = val ? 1 : 0;
628 break;
7b2ff18e
JO		 629 case IP_NODEFRAG:
630 if (sk->sk_type != SOCK_RAW) {
631 err = -ENOPROTOOPT;
632 break;
633 }
634 inet->nodefrag = val ? 1 : 0;
635 break;
132adf54 636 case IP_MTU_DISCOVER:
1b346576 637 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_OMIT)
132adf54
SH		 638 goto e_inval;
639 inet->pmtudisc = val;
640 break;
641 case IP_RECVERR:
642 inet->recverr = !!val;
643 if (!val)
644 skb_queue_purge(&sk->sk_error_queue);
645 break;
646 case IP_MULTICAST_TTL:
647 if (sk->sk_type == SOCK_STREAM)
648 goto e_inval;
4d52cfbe 649 if (optlen < 1)
132adf54 650 goto e_inval;
09cb105e 651 if (val == -1)
132adf54
SH		 652 val = 1;
653 if (val < 0 || val > 255)
654 goto e_inval;
655 inet->mc_ttl = val;
656 break;
657 case IP_MULTICAST_LOOP:
4d52cfbe 658 if (optlen < 1)
132adf54
SH		 659 goto e_inval;
660 inet->mc_loop = !!val;
661 break;
76e21053
EH		 662 case IP_UNICAST_IF:
663 {
664 struct net_device *dev = NULL;
665 int ifindex;
666
667 if (optlen != sizeof(int))
668 goto e_inval;
669
670 ifindex = (__force int)ntohl((__force __be32)val);
671 if (ifindex == 0) {
672 inet->uc_index = 0;
673 err = 0;
674 break;
675 }
676
677 dev = dev_get_by_index(sock_net(sk), ifindex);
678 err = -EADDRNOTAVAIL;
679 if (!dev)
680 break;
681 dev_put(dev);
682
683 err = -EINVAL;
684 if (sk->sk_bound_dev_if)
685 break;
686
687 inet->uc_index = ifindex;
688 err = 0;
689 break;
690 }
132adf54
SH		 691 case IP_MULTICAST_IF:
692 {
693 struct ip_mreqn mreq;
694 struct net_device *dev = NULL;
695
696 if (sk->sk_type == SOCK_STREAM)
697 goto e_inval;
698 /*
699 * Check the arguments are allowable
700 */
701
0915921b
SW		 702 if (optlen < sizeof(struct in_addr))
703 goto e_inval;
704
132adf54
SH		 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));
3a084ddb
JP		 711 if (optlen >= sizeof(struct ip_mreq)) {
712 if (copy_from_user(&mreq, optval,
713 sizeof(struct ip_mreq)))
714 break;
715 } else if (optlen >= sizeof(struct in_addr)) {
716 if (copy_from_user(&mreq.imr_address, optval,
717 sizeof(struct in_addr)))
718 break;
719 }
132adf54
SH		 720 }
721
722 if (!mreq.imr_ifindex) {
e6f1cebf 723 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) {
132adf54
SH		 724 inet->mc_index = 0;
725 inet->mc_addr = 0;
726 err = 0;
1da177e4
LT		 727 break;
728 }
3b1e0a65 729 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr);
55b80503 730 if (dev)
132adf54 731 mreq.imr_ifindex = dev->ifindex;
132adf54 732 } else
55b80503 733 dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex);
1da177e4 734
1da177e4 735
132adf54
SH		 736 err = -EADDRNOTAVAIL;
737 if (!dev)
738 break;
55b80503 739 dev_put(dev);
132adf54
SH		 740
741 err = -EINVAL;
742 if (sk->sk_bound_dev_if &&
743 mreq.imr_ifindex != sk->sk_bound_dev_if)
744 break;
1da177e4 745
132adf54
SH		 746 inet->mc_index = mreq.imr_ifindex;
747 inet->mc_addr = mreq.imr_address.s_addr;
748 err = 0;
749 break;
750 }
1da177e4 751
132adf54
SH		 752 case IP_ADD_MEMBERSHIP:
753 case IP_DROP_MEMBERSHIP:
754 {
755 struct ip_mreqn mreq;
1da177e4 756
a96fb49b
FL		 757 err = -EPROTO;
758 if (inet_sk(sk)->is_icsk)
759 break;
760
132adf54
SH		 761 if (optlen < sizeof(struct ip_mreq))
762 goto e_inval;
763 err = -EFAULT;
764 if (optlen >= sizeof(struct ip_mreqn)) {
09cb105e 765 if (copy_from_user(&mreq, optval, sizeof(mreq)))
1da177e4 766 break;
132adf54
SH		 767 } else {
768 memset(&mreq, 0, sizeof(mreq));
09cb105e 769 if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq)))
1da177e4 770 break;
132adf54 771 }
1da177e4 772
132adf54
SH		 773 if (optname == IP_ADD_MEMBERSHIP)
774 err = ip_mc_join_group(sk, &mreq);
775 else
776 err = ip_mc_leave_group(sk, &mreq);
777 break;
778 }
779 case IP_MSFILTER:
780 {
132adf54
SH		 781 struct ip_msfilter *msf;
782
783 if (optlen < IP_MSFILTER_SIZE(0))
784 goto e_inval;
785 if (optlen > sysctl_optmem_max) {
786 err = -ENOBUFS;
1da177e4
LT		 787 break;
788 }
132adf54 789 msf = kmalloc(optlen, GFP_KERNEL);
cfcabdcc 790 if (!msf) {
132adf54
SH		 791 err = -ENOBUFS;
792 break;
793 }
794 err = -EFAULT;
795 if (copy_from_user(msf, optval, optlen)) {
796 kfree(msf);
797 break;
798 }
799 /* numsrc >= (1G-4) overflow in 32 bits */
800 if (msf->imsf_numsrc >= 0x3ffffffcU ||
801 msf->imsf_numsrc > sysctl_igmp_max_msf) {
802 kfree(msf);
803 err = -ENOBUFS;
804 break;
805 }
806 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
807 kfree(msf);
808 err = -EINVAL;
809 break;
810 }
811 err = ip_mc_msfilter(sk, msf, 0);
812 kfree(msf);
813 break;
814 }
815 case IP_BLOCK_SOURCE:
816 case IP_UNBLOCK_SOURCE:
817 case IP_ADD_SOURCE_MEMBERSHIP:
818 case IP_DROP_SOURCE_MEMBERSHIP:
819 {
820 struct ip_mreq_source mreqs;
821 int omode, add;
1da177e4 822
132adf54
SH		 823 if (optlen != sizeof(struct ip_mreq_source))
824 goto e_inval;
825 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
1da177e4 826 err = -EFAULT;
1da177e4
LT		 827 break;
828 }
132adf54
SH		 829 if (optname == IP_BLOCK_SOURCE) {
830 omode = MCAST_EXCLUDE;
831 add = 1;
832 } else if (optname == IP_UNBLOCK_SOURCE) {
833 omode = MCAST_EXCLUDE;
834 add = 0;
835 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
836 struct ip_mreqn mreq;
1da177e4 837
132adf54
SH		 838 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
839 mreq.imr_address.s_addr = mreqs.imr_interface;
840 mreq.imr_ifindex = 0;
841 err = ip_mc_join_group(sk, &mreq);
842 if (err && err != -EADDRINUSE)
1da177e4 843 break;
132adf54
SH		 844 omode = MCAST_INCLUDE;
845 add = 1;
846 } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
847 omode = MCAST_INCLUDE;
848 add = 0;
849 }
850 err = ip_mc_source(add, omode, sk, &mreqs, 0);
851 break;
852 }
853 case MCAST_JOIN_GROUP:
854 case MCAST_LEAVE_GROUP:
855 {
856 struct group_req greq;
857 struct sockaddr_in *psin;
858 struct ip_mreqn mreq;
859
860 if (optlen < sizeof(struct group_req))
861 goto e_inval;
862 err = -EFAULT;
863 if (copy_from_user(&greq, optval, sizeof(greq)))
864 break;
865 psin = (struct sockaddr_in *)&greq.gr_group;
866 if (psin->sin_family != AF_INET)
867 goto e_inval;
868 memset(&mreq, 0, sizeof(mreq));
869 mreq.imr_multiaddr = psin->sin_addr;
870 mreq.imr_ifindex = greq.gr_interface;
871
872 if (optname == MCAST_JOIN_GROUP)
873 err = ip_mc_join_group(sk, &mreq);
874 else
875 err = ip_mc_leave_group(sk, &mreq);
876 break;
877 }
878 case MCAST_JOIN_SOURCE_GROUP:
879 case MCAST_LEAVE_SOURCE_GROUP:
880 case MCAST_BLOCK_SOURCE:
881 case MCAST_UNBLOCK_SOURCE:
882 {
883 struct group_source_req greqs;
884 struct ip_mreq_source mreqs;
885 struct sockaddr_in *psin;
886 int omode, add;
887
888 if (optlen != sizeof(struct group_source_req))
889 goto e_inval;
890 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
1da177e4 891 err = -EFAULT;
1da177e4
LT		 892 break;
893 }
132adf54
SH		 894 if (greqs.gsr_group.ss_family != AF_INET ||
895 greqs.gsr_source.ss_family != AF_INET) {
896 err = -EADDRNOTAVAIL;
1da177e4
LT		 897 break;
898 }
132adf54
SH		 899 psin = (struct sockaddr_in *)&greqs.gsr_group;
900 mreqs.imr_multiaddr = psin->sin_addr.s_addr;
901 psin = (struct sockaddr_in *)&greqs.gsr_source;
902 mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
903 mreqs.imr_interface = 0; /* use index for mc_source */
904
905 if (optname == MCAST_BLOCK_SOURCE) {
906 omode = MCAST_EXCLUDE;
907 add = 1;
908 } else if (optname == MCAST_UNBLOCK_SOURCE) {
909 omode = MCAST_EXCLUDE;
910 add = 0;
911 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
1da177e4
LT		 912 struct ip_mreqn mreq;
913
132adf54 914 psin = (struct sockaddr_in *)&greqs.gsr_group;
1da177e4 915 mreq.imr_multiaddr = psin->sin_addr;
132adf54
SH		 916 mreq.imr_address.s_addr = 0;
917 mreq.imr_ifindex = greqs.gsr_interface;
918 err = ip_mc_join_group(sk, &mreq);
919 if (err && err != -EADDRINUSE)
920 break;
921 greqs.gsr_interface = mreq.imr_ifindex;
922 omode = MCAST_INCLUDE;
923 add = 1;
924 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
925 omode = MCAST_INCLUDE;
926 add = 0;
927 }
928 err = ip_mc_source(add, omode, sk, &mreqs,
929 greqs.gsr_interface);
930 break;
931 }
932 case MCAST_MSFILTER:
933 {
132adf54
SH		 934 struct sockaddr_in *psin;
935 struct ip_msfilter *msf = NULL;
936 struct group_filter *gsf = NULL;
937 int msize, i, ifindex;
938
939 if (optlen < GROUP_FILTER_SIZE(0))
940 goto e_inval;
941 if (optlen > sysctl_optmem_max) {
942 err = -ENOBUFS;
1da177e4
LT		 943 break;
944 }
09cb105e 945 gsf = kmalloc(optlen, GFP_KERNEL);
cfcabdcc 946 if (!gsf) {
132adf54 947 err = -ENOBUFS;
1da177e4
LT		 948 break;
949 }
132adf54 950 err = -EFAULT;
4d52cfbe 951 if (copy_from_user(gsf, optval, optlen))
132adf54 952 goto mc_msf_out;
4d52cfbe 953
132adf54
SH		 954 /* numsrc >= (4G-140)/128 overflow in 32 bits */
955 if (gsf->gf_numsrc >= 0x1ffffff ||
956 gsf->gf_numsrc > sysctl_igmp_max_msf) {
957 err = -ENOBUFS;
958 goto mc_msf_out;
959 }
960 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
961 err = -EINVAL;
962 goto mc_msf_out;
963 }
964 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
09cb105e 965 msf = kmalloc(msize, GFP_KERNEL);
cfcabdcc 966 if (!msf) {
132adf54
SH		 967 err = -ENOBUFS;
968 goto mc_msf_out;
969 }
970 ifindex = gsf->gf_interface;
971 psin = (struct sockaddr_in *)&gsf->gf_group;
972 if (psin->sin_family != AF_INET) {
1da177e4 973 err = -EADDRNOTAVAIL;
132adf54 974 goto mc_msf_out;
1da177e4 975 }
132adf54
SH		 976 msf->imsf_multiaddr = psin->sin_addr.s_addr;
977 msf->imsf_interface = 0;
978 msf->imsf_fmode = gsf->gf_fmode;
979 msf->imsf_numsrc = gsf->gf_numsrc;
980 err = -EADDRNOTAVAIL;
4d52cfbe 981 for (i = 0; i < gsf->gf_numsrc; ++i) {
132adf54 982 psin = (struct sockaddr_in *)&gsf->gf_slist[i];
e905a9ed 983
132adf54
SH		 984 if (psin->sin_family != AF_INET)
985 goto mc_msf_out;
986 msf->imsf_slist[i] = psin->sin_addr.s_addr;
987 }
988 kfree(gsf);
989 gsf = NULL;
990
991 err = ip_mc_msfilter(sk, msf, ifindex);
4d52cfbe 992mc_msf_out:
132adf54
SH		 993 kfree(msf);
994 kfree(gsf);
995 break;
996 }
f771bef9
NS		 997 case IP_MULTICAST_ALL:
998 if (optlen < 1)
999 goto e_inval;
1000 if (val != 0 && val != 1)
1001 goto e_inval;
1002 inet->mc_all = val;
1003 break;
132adf54
SH		 1004 case IP_ROUTER_ALERT:
1005 err = ip_ra_control(sk, val ? 1 : 0, NULL);
1006 break;
1007
1008 case IP_FREEBIND:
4d52cfbe 1009 if (optlen < 1)
132adf54
SH		 1010 goto e_inval;
1011 inet->freebind = !!val;
1012 break;
1013
1014 case IP_IPSEC_POLICY:
1015 case IP_XFRM_POLICY:
1016 err = -EPERM;
52e804c6 1017 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1da177e4 1018 break;
132adf54
SH		 1019 err = xfrm_user_policy(sk, optname, optval, optlen);
1020 break;
1da177e4 1021
f5715aea 1022 case IP_TRANSPARENT:
52e804c6
EB		 1023 if (!!val && !ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) &&
1024 !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
f5715aea
KK		 1025 err = -EPERM;
1026 break;
1027 }
1028 if (optlen < 1)
1029 goto e_inval;
1030 inet->transparent = !!val;
1031 break;
1032
d218d111
SH		 1033 case IP_MINTTL:
1034 if (optlen < 1)
1035 goto e_inval;
1036 if (val < 0 || val > 255)
1037 goto e_inval;
1038 inet->min_ttl = val;
1039 break;
1040
132adf54
SH		 1041 default:
1042 err = -ENOPROTOOPT;
1043 break;
1da177e4
LT		 1044 }
1045 release_sock(sk);
1046 return err;
1047
1048e_inval:
1049 release_sock(sk);
1050 return -EINVAL;
1051}
1052
f84af32c 1053/**
d826eb14 1054 * ipv4_pktinfo_prepare - transfert some info from rtable to skb
f84af32c
ED		 1055 * @sk: socket
1056 * @skb: buffer
1057 *
35ebf65e
DM		 1058 * To support IP_CMSG_PKTINFO option, we store rt_iif and specific
1059 * destination in skb->cb[] before dst drop.
8e3bff96 1060 * This way, receiver doesn't make cache line misses to read rtable.
f84af32c 1061 */
fbf8866d 1062void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb)
f84af32c 1063{
d826eb14 1064 struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb);
4b261c75
HFS		 1065 bool prepare = (inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) ||
1066 ipv6_sk_rxinfo(sk);
d826eb14 1067
4b261c75 1068 if (prepare && skb_rtable(skb)) {
92101b3b 1069 pktinfo->ipi_ifindex = inet_iif(skb);
35ebf65e 1070 pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb);
d826eb14
ED		 1071 } else {
1072 pktinfo->ipi_ifindex = 0;
1073 pktinfo->ipi_spec_dst.s_addr = 0;
1074 }
1075 skb_dst_drop(skb);
f84af32c 1076}
f84af32c 1077
3fdadf7d 1078int ip_setsockopt(struct sock *sk, int level,
b7058842 1079 int optname, char __user *optval, unsigned int optlen)
3fdadf7d
DM		 1080{
1081 int err;
1082
1083 if (level != SOL_IP)
1084 return -ENOPROTOOPT;
1085
1086 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1087#ifdef CONFIG_NETFILTER
1088 /* we need to exclude all possible ENOPROTOOPTs except default case */
1089 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
6a9fb947
PE		 1090 optname != IP_IPSEC_POLICY &&
1091 optname != IP_XFRM_POLICY &&
1092 !ip_mroute_opt(optname)) {
3fdadf7d
DM		 1093 lock_sock(sk);
1094 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
1095 release_sock(sk);
1096 }
1097#endif
1098 return err;
1099}
4d52cfbe 1100EXPORT_SYMBOL(ip_setsockopt);
3fdadf7d
DM		 1101
1102#ifdef CONFIG_COMPAT
543d9cfe 1103int compat_ip_setsockopt(struct sock *sk, int level, int optname,
b7058842 1104 char __user *optval, unsigned int optlen)
3fdadf7d
DM		 1105{
1106 int err;
1107
1108 if (level != SOL_IP)
1109 return -ENOPROTOOPT;
1110
dae50295
DS		 1111 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
1112 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
1113 ip_setsockopt);
1114
3fdadf7d
DM		 1115 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1116#ifdef CONFIG_NETFILTER
1117 /* we need to exclude all possible ENOPROTOOPTs except default case */
1118 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
6a9fb947
PE		 1119 optname != IP_IPSEC_POLICY &&
1120 optname != IP_XFRM_POLICY &&
1121 !ip_mroute_opt(optname)) {
3fdadf7d 1122 lock_sock(sk);
543d9cfe
ACM		 1123 err = compat_nf_setsockopt(sk, PF_INET, optname,
1124 optval, optlen);
3fdadf7d
DM		 1125 release_sock(sk);
1126 }
1127#endif
1128 return err;
1129}
543d9cfe 1130EXPORT_SYMBOL(compat_ip_setsockopt);
3fdadf7d
DM		 1131#endif
1132
1da177e4 1133/*
4d52cfbe
ED		 1134 * Get the options. Note for future reference. The GET of IP options gets
1135 * the _received_ ones. The set sets the _sent_ ones.
1da177e4
LT		 1136 */
1137
3fdadf7d 1138static int do_ip_getsockopt(struct sock *sk, int level, int optname,
95c96174 1139 char __user *optval, int __user *optlen, unsigned int flags)
1da177e4
LT		 1140{
1141 struct inet_sock *inet = inet_sk(sk);
1142 int val;
1143 int len;
e905a9ed 1144
132adf54 1145 if (level != SOL_IP)
1da177e4
LT		 1146 return -EOPNOTSUPP;
1147
6a9fb947 1148 if (ip_mroute_opt(optname))
09cb105e 1149 return ip_mroute_getsockopt(sk, optname, optval, optlen);
1da177e4 1150
09cb105e 1151 if (get_user(len, optlen))
1da177e4 1152 return -EFAULT;
132adf54 1153 if (len < 0)
1da177e4 1154 return -EINVAL;
e905a9ed 1155
1da177e4
LT		 1156 lock_sock(sk);
1157
132adf54
SH		 1158 switch (optname) {
1159 case IP_OPTIONS:
1160 {
1161 unsigned char optbuf[sizeof(struct ip_options)+40];
f6d8bd05
ED		 1162 struct ip_options *opt = (struct ip_options *)optbuf;
1163 struct ip_options_rcu *inet_opt;
1164
1165 inet_opt = rcu_dereference_protected(inet->inet_opt,
1166 sock_owned_by_user(sk));
132adf54 1167 opt->optlen = 0;
f6d8bd05
ED		 1168 if (inet_opt)
1169 memcpy(optbuf, &inet_opt->opt,
1170 sizeof(struct ip_options) +
1171 inet_opt->opt.optlen);
132adf54
SH		 1172 release_sock(sk);
1173
1174 if (opt->optlen == 0)
1175 return put_user(0, optlen);
1176
1177 ip_options_undo(opt);
1178
1179 len = min_t(unsigned int, len, opt->optlen);
1180 if (put_user(len, optlen))
1181 return -EFAULT;
1182 if (copy_to_user(optval, opt->__data, len))
1183 return -EFAULT;
1184 return 0;
1185 }
1186 case IP_PKTINFO:
1187 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
1188 break;
1189 case IP_RECVTTL:
1190 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
1191 break;
1192 case IP_RECVTOS:
1193 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
1194 break;
1195 case IP_RECVOPTS:
1196 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
1197 break;
1198 case IP_RETOPTS:
1199 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
1200 break;
1201 case IP_PASSSEC:
1202 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
1203 break;
e8b2dfe9
BS		 1204 case IP_RECVORIGDSTADDR:
1205 val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0;
1206 break;
132adf54
SH		 1207 case IP_TOS:
1208 val = inet->tos;
1209 break;
1210 case IP_TTL:
1211 val = (inet->uc_ttl == -1 ?
1212 sysctl_ip_default_ttl :
1213 inet->uc_ttl);
1214 break;
1215 case IP_HDRINCL:
1216 val = inet->hdrincl;
1217 break;
a89b4763
MK		 1218 case IP_NODEFRAG:
1219 val = inet->nodefrag;
1220 break;
132adf54
SH		 1221 case IP_MTU_DISCOVER:
1222 val = inet->pmtudisc;
1223 break;
1224 case IP_MTU:
1225 {
1226 struct dst_entry *dst;
1227 val = 0;
1228 dst = sk_dst_get(sk);
1229 if (dst) {
1230 val = dst_mtu(dst);
1231 dst_release(dst);
1da177e4 1232 }
132adf54 1233 if (!val) {
1da177e4 1234 release_sock(sk);
132adf54 1235 return -ENOTCONN;
1da177e4 1236 }
132adf54
SH		 1237 break;
1238 }
1239 case IP_RECVERR:
1240 val = inet->recverr;
1241 break;
1242 case IP_MULTICAST_TTL:
1243 val = inet->mc_ttl;
1244 break;
1245 case IP_MULTICAST_LOOP:
1246 val = inet->mc_loop;
1247 break;
76e21053
EH		 1248 case IP_UNICAST_IF:
1249 val = (__force int)htonl((__u32) inet->uc_index);
1250 break;
132adf54
SH		 1251 case IP_MULTICAST_IF:
1252 {
1253 struct in_addr addr;
1254 len = min_t(unsigned int, len, sizeof(struct in_addr));
1255 addr.s_addr = inet->mc_addr;
1256 release_sock(sk);
1da177e4 1257
132adf54
SH		 1258 if (put_user(len, optlen))
1259 return -EFAULT;
1260 if (copy_to_user(optval, &addr, len))
1261 return -EFAULT;
1262 return 0;
1263 }
1264 case IP_MSFILTER:
1265 {
1266 struct ip_msfilter msf;
1267 int err;
1268
1269 if (len < IP_MSFILTER_SIZE(0)) {
1da177e4 1270 release_sock(sk);
132adf54 1271 return -EINVAL;
1da177e4 1272 }
132adf54 1273 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
1da177e4 1274 release_sock(sk);
132adf54 1275 return -EFAULT;
1da177e4 1276 }
132adf54
SH		 1277 err = ip_mc_msfget(sk, &msf,
1278 (struct ip_msfilter __user *)optval, optlen);
1279 release_sock(sk);
1280 return err;
1281 }
1282 case MCAST_MSFILTER:
1283 {
1284 struct group_filter gsf;
1285 int err;
1da177e4 1286
132adf54 1287 if (len < GROUP_FILTER_SIZE(0)) {
1da177e4 1288 release_sock(sk);
132adf54
SH		 1289 return -EINVAL;
1290 }
1291 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
1292 release_sock(sk);
1293 return -EFAULT;
1294 }
1295 err = ip_mc_gsfget(sk, &gsf,
4d52cfbe
ED		 1296 (struct group_filter __user *)optval,
1297 optlen);
132adf54
SH		 1298 release_sock(sk);
1299 return err;
1300 }
f771bef9
NS		 1301 case IP_MULTICAST_ALL:
1302 val = inet->mc_all;
1303 break;
132adf54
SH		 1304 case IP_PKTOPTIONS:
1305 {
1306 struct msghdr msg;
1da177e4 1307
132adf54 1308 release_sock(sk);
1da177e4 1309
132adf54
SH		 1310 if (sk->sk_type != SOCK_STREAM)
1311 return -ENOPROTOOPT;
1da177e4 1312
c54a5e02 1313 msg.msg_control = (__force void *) optval;
132adf54 1314 msg.msg_controllen = len;
dd23198e 1315 msg.msg_flags = flags;
1da177e4 1316
132adf54
SH		 1317 if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
1318 struct in_pktinfo info;
1319
c720c7e8
ED		 1320 info.ipi_addr.s_addr = inet->inet_rcv_saddr;
1321 info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr;
132adf54
SH		 1322 info.ipi_ifindex = inet->mc_index;
1323 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
1da177e4 1324 }
132adf54
SH		 1325 if (inet->cmsg_flags & IP_CMSG_TTL) {
1326 int hlim = inet->mc_ttl;
1327 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
1328 }
4c507d28
JB		 1329 if (inet->cmsg_flags & IP_CMSG_TOS) {
1330 int tos = inet->rcv_tos;
1331 put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos);
1332 }
132adf54
SH		 1333 len -= msg.msg_controllen;
1334 return put_user(len, optlen);
1335 }
1336 case IP_FREEBIND:
1337 val = inet->freebind;
1338 break;
f5715aea
KK		 1339 case IP_TRANSPARENT:
1340 val = inet->transparent;
1341 break;
d218d111
SH		 1342 case IP_MINTTL:
1343 val = inet->min_ttl;
1344 break;
132adf54
SH		 1345 default:
1346 release_sock(sk);
1347 return -ENOPROTOOPT;
1da177e4
LT		 1348 }
1349 release_sock(sk);
e905a9ed 1350
4d52cfbe 1351 if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) {
1da177e4
LT		 1352 unsigned char ucval = (unsigned char)val;
1353 len = 1;
132adf54 1354 if (put_user(len, optlen))
1da177e4 1355 return -EFAULT;
09cb105e 1356 if (copy_to_user(optval, &ucval, 1))
1da177e4
LT		 1357 return -EFAULT;
1358 } else {
1359 len = min_t(unsigned int, sizeof(int), len);
132adf54 1360 if (put_user(len, optlen))
1da177e4 1361 return -EFAULT;
09cb105e 1362 if (copy_to_user(optval, &val, len))
1da177e4
LT		 1363 return -EFAULT;
1364 }
1365 return 0;
1366}
1367
3fdadf7d 1368int ip_getsockopt(struct sock *sk, int level,
132adf54 1369 int optname, char __user *optval, int __user *optlen)
3fdadf7d
DM		 1370{
1371 int err;
1372
dd23198e 1373 err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0);
3fdadf7d
DM		 1374#ifdef CONFIG_NETFILTER
1375 /* we need to exclude all possible ENOPROTOOPTs except default case */
6a9fb947
PE		 1376 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1377 !ip_mroute_opt(optname)) {
e905a9ed 1378 int len;
3fdadf7d 1379
09cb105e 1380 if (get_user(len, optlen))
3fdadf7d
DM		 1381 return -EFAULT;
1382
1383 lock_sock(sk);
1384 err = nf_getsockopt(sk, PF_INET, optname, optval,
1385 &len);
1386 release_sock(sk);
1387 if (err >= 0)
1388 err = put_user(len, optlen);
1389 return err;
1390 }
1391#endif
1392 return err;
1393}
4d52cfbe 1394EXPORT_SYMBOL(ip_getsockopt);
3fdadf7d
DM		 1395
1396#ifdef CONFIG_COMPAT
543d9cfe
ACM		 1397int compat_ip_getsockopt(struct sock *sk, int level, int optname,
1398 char __user *optval, int __user *optlen)
3fdadf7d 1399{
42908c69
DS		 1400 int err;
1401
1402 if (optname == MCAST_MSFILTER)
1403 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1404 ip_getsockopt);
1405
dd23198e
DB		 1406 err = do_ip_getsockopt(sk, level, optname, optval, optlen,
1407 MSG_CMSG_COMPAT);
42908c69 1408
3fdadf7d
DM		 1409#ifdef CONFIG_NETFILTER
1410 /* we need to exclude all possible ENOPROTOOPTs except default case */
6a9fb947
PE		 1411 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1412 !ip_mroute_opt(optname)) {
e905a9ed 1413 int len;
3fdadf7d 1414
543d9cfe 1415 if (get_user(len, optlen))
3fdadf7d
DM		 1416 return -EFAULT;
1417
1418 lock_sock(sk);
543d9cfe 1419 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
3fdadf7d
DM		 1420 release_sock(sk);
1421 if (err >= 0)
1422 err = put_user(len, optlen);
1423 return err;
1424 }
1425#endif
1426 return err;
1427}
543d9cfe 1428EXPORT_SYMBOL(compat_ip_getsockopt);
3fdadf7d 1429#endif
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