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import PULS_20180308
[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 */
08c62a10 371int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
1da177e4
LT		 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));
08c62a10 408 *addr_len = sizeof(*sin);
1da177e4
LT		 409 }
410
411 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
412 sin = &errhdr.offender;
413 sin->sin_family = AF_UNSPEC;
414 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) {
415 struct inet_sock *inet = inet_sk(sk);
416
417 sin->sin_family = AF_INET;
eddc9ec5 418 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
1da177e4
LT		 419 sin->sin_port = 0;
420 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
421 if (inet->cmsg_flags)
422 ip_cmsg_recv(msg, skb);
423 }
424
425 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
426
427 /* Now we could try to dump offended packet options */
428
429 msg->msg_flags |= MSG_ERRQUEUE;
430 err = copied;
431
432 /* Reset and regenerate socket error */
e0f9f858 433 spin_lock_bh(&sk->sk_error_queue.lock);
1da177e4 434 sk->sk_err = 0;
4d52cfbe
ED		 435 skb2 = skb_peek(&sk->sk_error_queue);
436 if (skb2 != NULL) {
1da177e4 437 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
e0f9f858 438 spin_unlock_bh(&sk->sk_error_queue.lock);
1da177e4
LT		 439 sk->sk_error_report(sk);
440 } else
e0f9f858 441 spin_unlock_bh(&sk->sk_error_queue.lock);
1da177e4 442
e905a9ed 443out_free_skb:
1da177e4
LT		 444 kfree_skb(skb);
445out:
446 return err;
447}
448
449
450/*
4d52cfbe
ED		 451 * Socket option code for IP. This is the end of the line after any
452 * TCP,UDP etc options on an IP socket.
1da177e4
LT		 453 */
454
3fdadf7d 455static int do_ip_setsockopt(struct sock *sk, int level,
b7058842 456 int optname, char __user *optval, unsigned int optlen)
1da177e4
LT		 457{
458 struct inet_sock *inet = inet_sk(sk);
09cb105e 459 int val = 0, err;
1da177e4 460
0c9f79be
XW		 461 switch (optname) {
462 case IP_PKTINFO:
463 case IP_RECVTTL:
464 case IP_RECVOPTS:
465 case IP_RECVTOS:
466 case IP_RETOPTS:
467 case IP_TOS:
468 case IP_TTL:
469 case IP_HDRINCL:
470 case IP_MTU_DISCOVER:
471 case IP_RECVERR:
472 case IP_ROUTER_ALERT:
473 case IP_FREEBIND:
474 case IP_PASSSEC:
475 case IP_TRANSPARENT:
476 case IP_MINTTL:
477 case IP_NODEFRAG:
478 case IP_UNICAST_IF:
479 case IP_MULTICAST_TTL:
480 case IP_MULTICAST_ALL:
481 case IP_MULTICAST_LOOP:
482 case 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);
dfd56b8b 518#if IS_ENABLED(CONFIG_IPV6)
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);
dfd56b8b 529#if IS_ENABLED(CONFIG_IPV6)
1da177e4 530 }
132adf54 531#endif
1da177e4 532 }
f6d8bd05
ED		 533 rcu_assign_pointer(inet->inet_opt, opt);
534 if (old)
605b4afe 535 kfree_rcu(old, 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;
c9be4a5c 594 if (val != -1 && (val < 1 || 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;
76e21053
EH		 638 case IP_UNICAST_IF:
639 {
640 struct net_device *dev = NULL;
641 int ifindex;
642
643 if (optlen != sizeof(int))
644 goto e_inval;
645
646 ifindex = (__force int)ntohl((__force __be32)val);
647 if (ifindex == 0) {
648 inet->uc_index = 0;
649 err = 0;
650 break;
651 }
652
653 dev = dev_get_by_index(sock_net(sk), ifindex);
654 err = -EADDRNOTAVAIL;
655 if (!dev)
656 break;
657 dev_put(dev);
658
659 err = -EINVAL;
660 if (sk->sk_bound_dev_if)
661 break;
662
663 inet->uc_index = ifindex;
664 err = 0;
665 break;
666 }
132adf54
SH		 667 case IP_MULTICAST_IF:
668 {
669 struct ip_mreqn mreq;
670 struct net_device *dev = NULL;
671
672 if (sk->sk_type == SOCK_STREAM)
673 goto e_inval;
674 /*
675 * Check the arguments are allowable
676 */
677
0915921b
SW		 678 if (optlen < sizeof(struct in_addr))
679 goto e_inval;
680
132adf54
SH		 681 err = -EFAULT;
682 if (optlen >= sizeof(struct ip_mreqn)) {
09cb105e 683 if (copy_from_user(&mreq, optval, sizeof(mreq)))
1da177e4 684 break;
132adf54
SH		 685 } else {
686 memset(&mreq, 0, sizeof(mreq));
3a084ddb
JP		 687 if (optlen >= sizeof(struct ip_mreq)) {
688 if (copy_from_user(&mreq, optval,
689 sizeof(struct ip_mreq)))
690 break;
691 } else if (optlen >= sizeof(struct in_addr)) {
692 if (copy_from_user(&mreq.imr_address, optval,
693 sizeof(struct in_addr)))
694 break;
695 }
132adf54
SH		 696 }
697
698 if (!mreq.imr_ifindex) {
e6f1cebf 699 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) {
132adf54
SH		 700 inet->mc_index = 0;
701 inet->mc_addr = 0;
702 err = 0;
1da177e4
LT		 703 break;
704 }
3b1e0a65 705 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr);
55b80503 706 if (dev)
132adf54 707 mreq.imr_ifindex = dev->ifindex;
132adf54 708 } else
55b80503 709 dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex);
1da177e4 710
1da177e4 711
132adf54
SH		 712 err = -EADDRNOTAVAIL;
713 if (!dev)
714 break;
55b80503 715 dev_put(dev);
132adf54
SH		 716
717 err = -EINVAL;
718 if (sk->sk_bound_dev_if &&
719 mreq.imr_ifindex != sk->sk_bound_dev_if)
720 break;
1da177e4 721
132adf54
SH		 722 inet->mc_index = mreq.imr_ifindex;
723 inet->mc_addr = mreq.imr_address.s_addr;
724 err = 0;
725 break;
726 }
1da177e4 727
132adf54
SH		 728 case IP_ADD_MEMBERSHIP:
729 case IP_DROP_MEMBERSHIP:
730 {
731 struct ip_mreqn mreq;
1da177e4 732
a96fb49b
FL		 733 err = -EPROTO;
734 if (inet_sk(sk)->is_icsk)
735 break;
736
132adf54
SH		 737 if (optlen < sizeof(struct ip_mreq))
738 goto e_inval;
739 err = -EFAULT;
740 if (optlen >= sizeof(struct ip_mreqn)) {
09cb105e 741 if (copy_from_user(&mreq, optval, sizeof(mreq)))
1da177e4 742 break;
132adf54
SH		 743 } else {
744 memset(&mreq, 0, sizeof(mreq));
09cb105e 745 if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq)))
1da177e4 746 break;
132adf54 747 }
1da177e4 748
132adf54
SH		 749 if (optname == IP_ADD_MEMBERSHIP)
750 err = ip_mc_join_group(sk, &mreq);
751 else
752 err = ip_mc_leave_group(sk, &mreq);
753 break;
754 }
755 case IP_MSFILTER:
756 {
132adf54
SH		 757 struct ip_msfilter *msf;
758
759 if (optlen < IP_MSFILTER_SIZE(0))
760 goto e_inval;
761 if (optlen > sysctl_optmem_max) {
762 err = -ENOBUFS;
1da177e4
LT		 763 break;
764 }
132adf54 765 msf = kmalloc(optlen, GFP_KERNEL);
cfcabdcc 766 if (!msf) {
132adf54
SH		 767 err = -ENOBUFS;
768 break;
769 }
770 err = -EFAULT;
771 if (copy_from_user(msf, optval, optlen)) {
772 kfree(msf);
773 break;
774 }
775 /* numsrc >= (1G-4) overflow in 32 bits */
776 if (msf->imsf_numsrc >= 0x3ffffffcU ||
777 msf->imsf_numsrc > sysctl_igmp_max_msf) {
778 kfree(msf);
779 err = -ENOBUFS;
780 break;
781 }
782 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
783 kfree(msf);
784 err = -EINVAL;
785 break;
786 }
787 err = ip_mc_msfilter(sk, msf, 0);
788 kfree(msf);
789 break;
790 }
791 case IP_BLOCK_SOURCE:
792 case IP_UNBLOCK_SOURCE:
793 case IP_ADD_SOURCE_MEMBERSHIP:
794 case IP_DROP_SOURCE_MEMBERSHIP:
795 {
796 struct ip_mreq_source mreqs;
797 int omode, add;
1da177e4 798
132adf54
SH		 799 if (optlen != sizeof(struct ip_mreq_source))
800 goto e_inval;
801 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
1da177e4 802 err = -EFAULT;
1da177e4
LT		 803 break;
804 }
132adf54
SH		 805 if (optname == IP_BLOCK_SOURCE) {
806 omode = MCAST_EXCLUDE;
807 add = 1;
808 } else if (optname == IP_UNBLOCK_SOURCE) {
809 omode = MCAST_EXCLUDE;
810 add = 0;
811 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
812 struct ip_mreqn mreq;
1da177e4 813
132adf54
SH		 814 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
815 mreq.imr_address.s_addr = mreqs.imr_interface;
816 mreq.imr_ifindex = 0;
817 err = ip_mc_join_group(sk, &mreq);
818 if (err && err != -EADDRINUSE)
1da177e4 819 break;
132adf54
SH		 820 omode = MCAST_INCLUDE;
821 add = 1;
822 } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
823 omode = MCAST_INCLUDE;
824 add = 0;
825 }
826 err = ip_mc_source(add, omode, sk, &mreqs, 0);
827 break;
828 }
829 case MCAST_JOIN_GROUP:
830 case MCAST_LEAVE_GROUP:
831 {
832 struct group_req greq;
833 struct sockaddr_in *psin;
834 struct ip_mreqn mreq;
835
836 if (optlen < sizeof(struct group_req))
837 goto e_inval;
838 err = -EFAULT;
839 if (copy_from_user(&greq, optval, sizeof(greq)))
840 break;
841 psin = (struct sockaddr_in *)&greq.gr_group;
842 if (psin->sin_family != AF_INET)
843 goto e_inval;
844 memset(&mreq, 0, sizeof(mreq));
845 mreq.imr_multiaddr = psin->sin_addr;
846 mreq.imr_ifindex = greq.gr_interface;
847
848 if (optname == MCAST_JOIN_GROUP)
849 err = ip_mc_join_group(sk, &mreq);
850 else
851 err = ip_mc_leave_group(sk, &mreq);
852 break;
853 }
854 case MCAST_JOIN_SOURCE_GROUP:
855 case MCAST_LEAVE_SOURCE_GROUP:
856 case MCAST_BLOCK_SOURCE:
857 case MCAST_UNBLOCK_SOURCE:
858 {
859 struct group_source_req greqs;
860 struct ip_mreq_source mreqs;
861 struct sockaddr_in *psin;
862 int omode, add;
863
864 if (optlen != sizeof(struct group_source_req))
865 goto e_inval;
866 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
1da177e4 867 err = -EFAULT;
1da177e4
LT		 868 break;
869 }
132adf54
SH		 870 if (greqs.gsr_group.ss_family != AF_INET ||
871 greqs.gsr_source.ss_family != AF_INET) {
872 err = -EADDRNOTAVAIL;
1da177e4
LT		 873 break;
874 }
132adf54
SH		 875 psin = (struct sockaddr_in *)&greqs.gsr_group;
876 mreqs.imr_multiaddr = psin->sin_addr.s_addr;
877 psin = (struct sockaddr_in *)&greqs.gsr_source;
878 mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
879 mreqs.imr_interface = 0; /* use index for mc_source */
880
881 if (optname == MCAST_BLOCK_SOURCE) {
882 omode = MCAST_EXCLUDE;
883 add = 1;
884 } else if (optname == MCAST_UNBLOCK_SOURCE) {
885 omode = MCAST_EXCLUDE;
886 add = 0;
887 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
1da177e4
LT		 888 struct ip_mreqn mreq;
889
132adf54 890 psin = (struct sockaddr_in *)&greqs.gsr_group;
1da177e4 891 mreq.imr_multiaddr = psin->sin_addr;
132adf54
SH		 892 mreq.imr_address.s_addr = 0;
893 mreq.imr_ifindex = greqs.gsr_interface;
894 err = ip_mc_join_group(sk, &mreq);
895 if (err && err != -EADDRINUSE)
896 break;
897 greqs.gsr_interface = mreq.imr_ifindex;
898 omode = MCAST_INCLUDE;
899 add = 1;
900 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
901 omode = MCAST_INCLUDE;
902 add = 0;
903 }
904 err = ip_mc_source(add, omode, sk, &mreqs,
905 greqs.gsr_interface);
906 break;
907 }
908 case MCAST_MSFILTER:
909 {
132adf54
SH		 910 struct sockaddr_in *psin;
911 struct ip_msfilter *msf = NULL;
912 struct group_filter *gsf = NULL;
913 int msize, i, ifindex;
914
915 if (optlen < GROUP_FILTER_SIZE(0))
916 goto e_inval;
917 if (optlen > sysctl_optmem_max) {
918 err = -ENOBUFS;
1da177e4
LT		 919 break;
920 }
09cb105e 921 gsf = kmalloc(optlen, GFP_KERNEL);
cfcabdcc 922 if (!gsf) {
132adf54 923 err = -ENOBUFS;
1da177e4
LT		 924 break;
925 }
132adf54 926 err = -EFAULT;
4d52cfbe 927 if (copy_from_user(gsf, optval, optlen))
132adf54 928 goto mc_msf_out;
4d52cfbe 929
132adf54
SH		 930 /* numsrc >= (4G-140)/128 overflow in 32 bits */
931 if (gsf->gf_numsrc >= 0x1ffffff ||
932 gsf->gf_numsrc > sysctl_igmp_max_msf) {
933 err = -ENOBUFS;
934 goto mc_msf_out;
935 }
936 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
937 err = -EINVAL;
938 goto mc_msf_out;
939 }
940 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
09cb105e 941 msf = kmalloc(msize, GFP_KERNEL);
cfcabdcc 942 if (!msf) {
132adf54
SH		 943 err = -ENOBUFS;
944 goto mc_msf_out;
945 }
946 ifindex = gsf->gf_interface;
947 psin = (struct sockaddr_in *)&gsf->gf_group;
948 if (psin->sin_family != AF_INET) {
1da177e4 949 err = -EADDRNOTAVAIL;
132adf54 950 goto mc_msf_out;
1da177e4 951 }
132adf54
SH		 952 msf->imsf_multiaddr = psin->sin_addr.s_addr;
953 msf->imsf_interface = 0;
954 msf->imsf_fmode = gsf->gf_fmode;
955 msf->imsf_numsrc = gsf->gf_numsrc;
956 err = -EADDRNOTAVAIL;
4d52cfbe 957 for (i = 0; i < gsf->gf_numsrc; ++i) {
132adf54 958 psin = (struct sockaddr_in *)&gsf->gf_slist[i];
e905a9ed 959
132adf54
SH		 960 if (psin->sin_family != AF_INET)
961 goto mc_msf_out;
962 msf->imsf_slist[i] = psin->sin_addr.s_addr;
963 }
964 kfree(gsf);
965 gsf = NULL;
966
967 err = ip_mc_msfilter(sk, msf, ifindex);
4d52cfbe 968mc_msf_out:
132adf54
SH		 969 kfree(msf);
970 kfree(gsf);
971 break;
972 }
f771bef9
NS		 973 case IP_MULTICAST_ALL:
974 if (optlen < 1)
975 goto e_inval;
976 if (val != 0 && val != 1)
977 goto e_inval;
978 inet->mc_all = val;
979 break;
132adf54
SH		 980 case IP_ROUTER_ALERT:
981 err = ip_ra_control(sk, val ? 1 : 0, NULL);
982 break;
983
984 case IP_FREEBIND:
4d52cfbe 985 if (optlen < 1)
132adf54
SH		 986 goto e_inval;
987 inet->freebind = !!val;
988 break;
989
990 case IP_IPSEC_POLICY:
991 case IP_XFRM_POLICY:
992 err = -EPERM;
52e804c6 993 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1da177e4 994 break;
132adf54
SH		 995 err = xfrm_user_policy(sk, optname, optval, optlen);
996 break;
1da177e4 997
f5715aea 998 case IP_TRANSPARENT:
52e804c6
EB		 999 if (!!val && !ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) &&
1000 !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
f5715aea
KK		 1001 err = -EPERM;
1002 break;
1003 }
1004 if (optlen < 1)
1005 goto e_inval;
1006 inet->transparent = !!val;
1007 break;
1008
d218d111
SH		 1009 case IP_MINTTL:
1010 if (optlen < 1)
1011 goto e_inval;
1012 if (val < 0 || val > 255)
1013 goto e_inval;
1014 inet->min_ttl = val;
1015 break;
1016
132adf54
SH		 1017 default:
1018 err = -ENOPROTOOPT;
1019 break;
1da177e4
LT		 1020 }
1021 release_sock(sk);
1022 return err;
1023
1024e_inval:
1025 release_sock(sk);
1026 return -EINVAL;
1027}
1028
f84af32c 1029/**
d826eb14 1030 * ipv4_pktinfo_prepare - transfert some info from rtable to skb
f84af32c
ED		 1031 * @sk: socket
1032 * @skb: buffer
1033 *
35ebf65e
DM		 1034 * To support IP_CMSG_PKTINFO option, we store rt_iif and specific
1035 * destination in skb->cb[] before dst drop.
d826eb14 1036 * This way, receiver doesnt make cache line misses to read rtable.
f84af32c 1037 */
d826eb14 1038void ipv4_pktinfo_prepare(struct sk_buff *skb)
f84af32c 1039{
d826eb14 1040 struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb);
d826eb14 1041
92101b3b
DM		 1042 if (skb_rtable(skb)) {
1043 pktinfo->ipi_ifindex = inet_iif(skb);
35ebf65e 1044 pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb);
d826eb14
ED		 1045 } else {
1046 pktinfo->ipi_ifindex = 0;
1047 pktinfo->ipi_spec_dst.s_addr = 0;
1048 }
4b9e9796
S		 1049 /* We need to keep the dst for __ip_options_echo()
1050 * We could restrict the test to opt.ts_needtime || opt.srr,
1051 * but the following is good enough as IP options are not often used.
1052 */
1053 if (unlikely(IPCB(skb)->opt.optlen))
1054 skb_dst_force(skb);
1055 else
d826eb14 1056 skb_dst_drop(skb);
f84af32c 1057}
f84af32c 1058
3fdadf7d 1059int ip_setsockopt(struct sock *sk, int level,
b7058842 1060 int optname, char __user *optval, unsigned int optlen)
3fdadf7d
DM		 1061{
1062 int err;
1063
1064 if (level != SOL_IP)
1065 return -ENOPROTOOPT;
1066
1067 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1068#ifdef CONFIG_NETFILTER
1069 /* we need to exclude all possible ENOPROTOOPTs except default case */
1070 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
6a9fb947
PE		 1071 optname != IP_IPSEC_POLICY &&
1072 optname != IP_XFRM_POLICY &&
1073 !ip_mroute_opt(optname)) {
3fdadf7d
DM		 1074 lock_sock(sk);
1075 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
1076 release_sock(sk);
1077 }
1078#endif
1079 return err;
1080}
4d52cfbe 1081EXPORT_SYMBOL(ip_setsockopt);
3fdadf7d
DM		 1082
1083#ifdef CONFIG_COMPAT
543d9cfe 1084int compat_ip_setsockopt(struct sock *sk, int level, int optname,
b7058842 1085 char __user *optval, unsigned int optlen)
3fdadf7d
DM		 1086{
1087 int err;
1088
1089 if (level != SOL_IP)
1090 return -ENOPROTOOPT;
1091
dae50295
DS		 1092 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
1093 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
1094 ip_setsockopt);
1095
3fdadf7d
DM		 1096 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1097#ifdef CONFIG_NETFILTER
1098 /* we need to exclude all possible ENOPROTOOPTs except default case */
1099 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
6a9fb947
PE		 1100 optname != IP_IPSEC_POLICY &&
1101 optname != IP_XFRM_POLICY &&
1102 !ip_mroute_opt(optname)) {
3fdadf7d 1103 lock_sock(sk);
543d9cfe
ACM		 1104 err = compat_nf_setsockopt(sk, PF_INET, optname,
1105 optval, optlen);
3fdadf7d
DM		 1106 release_sock(sk);
1107 }
1108#endif
1109 return err;
1110}
543d9cfe 1111EXPORT_SYMBOL(compat_ip_setsockopt);
3fdadf7d
DM		 1112#endif
1113
1da177e4 1114/*
4d52cfbe
ED		 1115 * Get the options. Note for future reference. The GET of IP options gets
1116 * the _received_ ones. The set sets the _sent_ ones.
1da177e4
LT		 1117 */
1118
3fdadf7d 1119static int do_ip_getsockopt(struct sock *sk, int level, int optname,
95c96174 1120 char __user *optval, int __user *optlen, unsigned int flags)
1da177e4
LT		 1121{
1122 struct inet_sock *inet = inet_sk(sk);
1123 int val;
1124 int len;
e905a9ed 1125
132adf54 1126 if (level != SOL_IP)
1da177e4
LT		 1127 return -EOPNOTSUPP;
1128
6a9fb947 1129 if (ip_mroute_opt(optname))
09cb105e 1130 return ip_mroute_getsockopt(sk, optname, optval, optlen);
1da177e4 1131
09cb105e 1132 if (get_user(len, optlen))
1da177e4 1133 return -EFAULT;
132adf54 1134 if (len < 0)
1da177e4 1135 return -EINVAL;
e905a9ed 1136
1da177e4
LT		 1137 lock_sock(sk);
1138
132adf54
SH		 1139 switch (optname) {
1140 case IP_OPTIONS:
1141 {
1142 unsigned char optbuf[sizeof(struct ip_options)+40];
f6d8bd05
ED		 1143 struct ip_options *opt = (struct ip_options *)optbuf;
1144 struct ip_options_rcu *inet_opt;
1145
1146 inet_opt = rcu_dereference_protected(inet->inet_opt,
1147 sock_owned_by_user(sk));
132adf54 1148 opt->optlen = 0;
f6d8bd05
ED		 1149 if (inet_opt)
1150 memcpy(optbuf, &inet_opt->opt,
1151 sizeof(struct ip_options) +
1152 inet_opt->opt.optlen);
132adf54
SH		 1153 release_sock(sk);
1154
1155 if (opt->optlen == 0)
1156 return put_user(0, optlen);
1157
1158 ip_options_undo(opt);
1159
1160 len = min_t(unsigned int, len, opt->optlen);
1161 if (put_user(len, optlen))
1162 return -EFAULT;
1163 if (copy_to_user(optval, opt->__data, len))
1164 return -EFAULT;
1165 return 0;
1166 }
1167 case IP_PKTINFO:
1168 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
1169 break;
1170 case IP_RECVTTL:
1171 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
1172 break;
1173 case IP_RECVTOS:
1174 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
1175 break;
1176 case IP_RECVOPTS:
1177 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
1178 break;
1179 case IP_RETOPTS:
1180 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
1181 break;
1182 case IP_PASSSEC:
1183 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
1184 break;
e8b2dfe9
BS		 1185 case IP_RECVORIGDSTADDR:
1186 val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0;
1187 break;
132adf54
SH		 1188 case IP_TOS:
1189 val = inet->tos;
1190 break;
1191 case IP_TTL:
1192 val = (inet->uc_ttl == -1 ?
1193 sysctl_ip_default_ttl :
1194 inet->uc_ttl);
1195 break;
1196 case IP_HDRINCL:
1197 val = inet->hdrincl;
1198 break;
a89b4763
MK		 1199 case IP_NODEFRAG:
1200 val = inet->nodefrag;
1201 break;
132adf54
SH		 1202 case IP_MTU_DISCOVER:
1203 val = inet->pmtudisc;
1204 break;
1205 case IP_MTU:
1206 {
1207 struct dst_entry *dst;
1208 val = 0;
1209 dst = sk_dst_get(sk);
1210 if (dst) {
1211 val = dst_mtu(dst);
1212 dst_release(dst);
1da177e4 1213 }
132adf54 1214 if (!val) {
1da177e4 1215 release_sock(sk);
132adf54 1216 return -ENOTCONN;
1da177e4 1217 }
132adf54
SH		 1218 break;
1219 }
1220 case IP_RECVERR:
1221 val = inet->recverr;
1222 break;
1223 case IP_MULTICAST_TTL:
1224 val = inet->mc_ttl;
1225 break;
1226 case IP_MULTICAST_LOOP:
1227 val = inet->mc_loop;
1228 break;
76e21053
EH		 1229 case IP_UNICAST_IF:
1230 val = (__force int)htonl((__u32) inet->uc_index);
1231 break;
132adf54
SH		 1232 case IP_MULTICAST_IF:
1233 {
1234 struct in_addr addr;
1235 len = min_t(unsigned int, len, sizeof(struct in_addr));
1236 addr.s_addr = inet->mc_addr;
1237 release_sock(sk);
1da177e4 1238
132adf54
SH		 1239 if (put_user(len, optlen))
1240 return -EFAULT;
1241 if (copy_to_user(optval, &addr, len))
1242 return -EFAULT;
1243 return 0;
1244 }
1245 case IP_MSFILTER:
1246 {
1247 struct ip_msfilter msf;
1248 int err;
1249
1250 if (len < IP_MSFILTER_SIZE(0)) {
1da177e4 1251 release_sock(sk);
132adf54 1252 return -EINVAL;
1da177e4 1253 }
132adf54 1254 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
1da177e4 1255 release_sock(sk);
132adf54 1256 return -EFAULT;
1da177e4 1257 }
132adf54
SH		 1258 err = ip_mc_msfget(sk, &msf,
1259 (struct ip_msfilter __user *)optval, optlen);
1260 release_sock(sk);
1261 return err;
1262 }
1263 case MCAST_MSFILTER:
1264 {
1265 struct group_filter gsf;
1266 int err;
1da177e4 1267
132adf54 1268 if (len < GROUP_FILTER_SIZE(0)) {
1da177e4 1269 release_sock(sk);
132adf54
SH		 1270 return -EINVAL;
1271 }
1272 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
1273 release_sock(sk);
1274 return -EFAULT;
1275 }
1276 err = ip_mc_gsfget(sk, &gsf,
4d52cfbe
ED		 1277 (struct group_filter __user *)optval,
1278 optlen);
132adf54
SH		 1279 release_sock(sk);
1280 return err;
1281 }
f771bef9
NS		 1282 case IP_MULTICAST_ALL:
1283 val = inet->mc_all;
1284 break;
132adf54
SH		 1285 case IP_PKTOPTIONS:
1286 {
1287 struct msghdr msg;
1da177e4 1288
132adf54 1289 release_sock(sk);
1da177e4 1290
132adf54
SH		 1291 if (sk->sk_type != SOCK_STREAM)
1292 return -ENOPROTOOPT;
1da177e4 1293
132adf54
SH		 1294 msg.msg_control = optval;
1295 msg.msg_controllen = len;
dd23198e 1296 msg.msg_flags = flags;
1da177e4 1297
132adf54
SH		 1298 if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
1299 struct in_pktinfo info;
1300
c720c7e8
ED		 1301 info.ipi_addr.s_addr = inet->inet_rcv_saddr;
1302 info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr;
132adf54
SH		 1303 info.ipi_ifindex = inet->mc_index;
1304 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
1da177e4 1305 }
132adf54
SH		 1306 if (inet->cmsg_flags & IP_CMSG_TTL) {
1307 int hlim = inet->mc_ttl;
1308 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
1309 }
4c507d28
JB		 1310 if (inet->cmsg_flags & IP_CMSG_TOS) {
1311 int tos = inet->rcv_tos;
1312 put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos);
1313 }
132adf54
SH		 1314 len -= msg.msg_controllen;
1315 return put_user(len, optlen);
1316 }
1317 case IP_FREEBIND:
1318 val = inet->freebind;
1319 break;
f5715aea
KK		 1320 case IP_TRANSPARENT:
1321 val = inet->transparent;
1322 break;
d218d111
SH		 1323 case IP_MINTTL:
1324 val = inet->min_ttl;
1325 break;
132adf54
SH		 1326 default:
1327 release_sock(sk);
1328 return -ENOPROTOOPT;
1da177e4
LT		 1329 }
1330 release_sock(sk);
e905a9ed 1331
4d52cfbe 1332 if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) {
1da177e4
LT		 1333 unsigned char ucval = (unsigned char)val;
1334 len = 1;
132adf54 1335 if (put_user(len, optlen))
1da177e4 1336 return -EFAULT;
09cb105e 1337 if (copy_to_user(optval, &ucval, 1))
1da177e4
LT		 1338 return -EFAULT;
1339 } else {
1340 len = min_t(unsigned int, sizeof(int), len);
132adf54 1341 if (put_user(len, optlen))
1da177e4 1342 return -EFAULT;
09cb105e 1343 if (copy_to_user(optval, &val, len))
1da177e4
LT		 1344 return -EFAULT;
1345 }
1346 return 0;
1347}
1348
3fdadf7d 1349int ip_getsockopt(struct sock *sk, int level,
132adf54 1350 int optname, char __user *optval, int __user *optlen)
3fdadf7d
DM		 1351{
1352 int err;
1353
dd23198e 1354 err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0);
3fdadf7d
DM		 1355#ifdef CONFIG_NETFILTER
1356 /* we need to exclude all possible ENOPROTOOPTs except default case */
6a9fb947
PE		 1357 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1358 !ip_mroute_opt(optname)) {
e905a9ed 1359 int len;
3fdadf7d 1360
09cb105e 1361 if (get_user(len, optlen))
3fdadf7d
DM		 1362 return -EFAULT;
1363
1364 lock_sock(sk);
1365 err = nf_getsockopt(sk, PF_INET, optname, optval,
1366 &len);
1367 release_sock(sk);
1368 if (err >= 0)
1369 err = put_user(len, optlen);
1370 return err;
1371 }
1372#endif
1373 return err;
1374}
4d52cfbe 1375EXPORT_SYMBOL(ip_getsockopt);
3fdadf7d
DM		 1376
1377#ifdef CONFIG_COMPAT
543d9cfe
ACM		 1378int compat_ip_getsockopt(struct sock *sk, int level, int optname,
1379 char __user *optval, int __user *optlen)
3fdadf7d 1380{
42908c69
DS		 1381 int err;
1382
1383 if (optname == MCAST_MSFILTER)
1384 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1385 ip_getsockopt);
1386
dd23198e
DB		 1387 err = do_ip_getsockopt(sk, level, optname, optval, optlen,
1388 MSG_CMSG_COMPAT);
42908c69 1389
3fdadf7d
DM		 1390#ifdef CONFIG_NETFILTER
1391 /* we need to exclude all possible ENOPROTOOPTs except default case */
6a9fb947
PE		 1392 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1393 !ip_mroute_opt(optname)) {
e905a9ed 1394 int len;
3fdadf7d 1395
543d9cfe 1396 if (get_user(len, optlen))
3fdadf7d
DM		 1397 return -EFAULT;
1398
1399 lock_sock(sk);
543d9cfe 1400 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
3fdadf7d
DM		 1401 release_sock(sk);
1402 if (err >= 0)
1403 err = put_user(len, optlen);
1404 return err;
1405 }
1406#endif
1407 return err;
1408}
543d9cfe 1409EXPORT_SYMBOL(compat_ip_getsockopt);
3fdadf7d 1410#endif
kernel source for telekom puls (alcatel/mediatek)