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drivers: power: report battery voltage in AOSP compatible format
[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;
1d480edb 413 memset(sin, 0, sizeof(*sin));
1da177e4 414 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) {
1da177e4 415 sin->sin_family = AF_INET;
eddc9ec5 416 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
1d480edb 417 if (inet_sk(sk)->cmsg_flags)
1da177e4
LT		 418 ip_cmsg_recv(msg, skb);
419 }
420
421 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
422
423 /* Now we could try to dump offended packet options */
424
425 msg->msg_flags |= MSG_ERRQUEUE;
426 err = copied;
427
428 /* Reset and regenerate socket error */
e0f9f858 429 spin_lock_bh(&sk->sk_error_queue.lock);
1da177e4 430 sk->sk_err = 0;
4d52cfbe
ED		 431 skb2 = skb_peek(&sk->sk_error_queue);
432 if (skb2 != NULL) {
1da177e4 433 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
e0f9f858 434 spin_unlock_bh(&sk->sk_error_queue.lock);
1da177e4
LT		 435 sk->sk_error_report(sk);
436 } else
e0f9f858 437 spin_unlock_bh(&sk->sk_error_queue.lock);
1da177e4 438
e905a9ed 439out_free_skb:
1da177e4
LT		 440 kfree_skb(skb);
441out:
442 return err;
443}
444
445
446/*
4d52cfbe
ED		 447 * Socket option code for IP. This is the end of the line after any
448 * TCP,UDP etc options on an IP socket.
1da177e4
LT		 449 */
450
3fdadf7d 451static int do_ip_setsockopt(struct sock *sk, int level,
b7058842 452 int optname, char __user *optval, unsigned int optlen)
1da177e4
LT		 453{
454 struct inet_sock *inet = inet_sk(sk);
09cb105e 455 int val = 0, err;
1da177e4 456
0c9f79be
XW		 457 switch (optname) {
458 case IP_PKTINFO:
459 case IP_RECVTTL:
460 case IP_RECVOPTS:
461 case IP_RECVTOS:
462 case IP_RETOPTS:
463 case IP_TOS:
464 case IP_TTL:
465 case IP_HDRINCL:
466 case IP_MTU_DISCOVER:
467 case IP_RECVERR:
468 case IP_ROUTER_ALERT:
469 case IP_FREEBIND:
470 case IP_PASSSEC:
471 case IP_TRANSPARENT:
472 case IP_MINTTL:
473 case IP_NODEFRAG:
474 case IP_UNICAST_IF:
475 case IP_MULTICAST_TTL:
476 case IP_MULTICAST_ALL:
477 case IP_MULTICAST_LOOP:
478 case IP_RECVORIGDSTADDR:
1da177e4
LT		 479 if (optlen >= sizeof(int)) {
480 if (get_user(val, (int __user *) optval))
481 return -EFAULT;
482 } else if (optlen >= sizeof(char)) {
483 unsigned char ucval;
484
485 if (get_user(ucval, (unsigned char __user *) optval))
486 return -EFAULT;
487 val = (int) ucval;
488 }
489 }
490
491 /* If optlen==0, it is equivalent to val == 0 */
492
6a9fb947 493 if (ip_mroute_opt(optname))
09cb105e 494 return ip_mroute_setsockopt(sk, optname, optval, optlen);
1da177e4
LT		 495
496 err = 0;
497 lock_sock(sk);
498
499 switch (optname) {
132adf54
SH		 500 case IP_OPTIONS:
501 {
f6d8bd05
ED		 502 struct ip_options_rcu *old, *opt = NULL;
503
65a1c4ff 504 if (optlen > 40)
132adf54 505 goto e_inval;
3b1e0a65 506 err = ip_options_get_from_user(sock_net(sk), &opt,
cb84663e 507 optval, optlen);
132adf54
SH		 508 if (err)
509 break;
f6d8bd05
ED		 510 old = rcu_dereference_protected(inet->inet_opt,
511 sock_owned_by_user(sk));
132adf54
SH		 512 if (inet->is_icsk) {
513 struct inet_connection_sock *icsk = inet_csk(sk);
dfd56b8b 514#if IS_ENABLED(CONFIG_IPV6)
132adf54
SH		 515 if (sk->sk_family == PF_INET ||
516 (!((1 << sk->sk_state) &
517 (TCPF_LISTEN | TCPF_CLOSE)) &&
c720c7e8 518 inet->inet_daddr != LOOPBACK4_IPV6)) {
1da177e4 519#endif
f6d8bd05
ED		 520 if (old)
521 icsk->icsk_ext_hdr_len -= old->opt.optlen;
132adf54 522 if (opt)
f6d8bd05 523 icsk->icsk_ext_hdr_len += opt->opt.optlen;
132adf54 524 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
dfd56b8b 525#if IS_ENABLED(CONFIG_IPV6)
1da177e4 526 }
132adf54 527#endif
1da177e4 528 }
f6d8bd05
ED		 529 rcu_assign_pointer(inet->inet_opt, opt);
530 if (old)
605b4afe 531 kfree_rcu(old, rcu);
132adf54
SH		 532 break;
533 }
534 case IP_PKTINFO:
535 if (val)
536 inet->cmsg_flags |= IP_CMSG_PKTINFO;
537 else
538 inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
539 break;
540 case IP_RECVTTL:
541 if (val)
542 inet->cmsg_flags |= IP_CMSG_TTL;
543 else
544 inet->cmsg_flags &= ~IP_CMSG_TTL;
545 break;
546 case IP_RECVTOS:
547 if (val)
548 inet->cmsg_flags |= IP_CMSG_TOS;
549 else
550 inet->cmsg_flags &= ~IP_CMSG_TOS;
551 break;
552 case IP_RECVOPTS:
553 if (val)
554 inet->cmsg_flags |= IP_CMSG_RECVOPTS;
555 else
556 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
557 break;
558 case IP_RETOPTS:
559 if (val)
560 inet->cmsg_flags |= IP_CMSG_RETOPTS;
561 else
562 inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
563 break;
564 case IP_PASSSEC:
565 if (val)
566 inet->cmsg_flags |= IP_CMSG_PASSSEC;
567 else
568 inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
569 break;
e8b2dfe9
BS		 570 case IP_RECVORIGDSTADDR:
571 if (val)
572 inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR;
573 else
574 inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR;
575 break;
132adf54
SH		 576 case IP_TOS: /* This sets both TOS and Precedence */
577 if (sk->sk_type == SOCK_STREAM) {
2c67e9ac
MŻ		 578 val &= ~INET_ECN_MASK;
579 val |= inet->tos & INET_ECN_MASK;
132adf54 580 }
132adf54
SH		 581 if (inet->tos != val) {
582 inet->tos = val;
583 sk->sk_priority = rt_tos2priority(val);
584 sk_dst_reset(sk);
585 }
586 break;
587 case IP_TTL:
4d52cfbe 588 if (optlen < 1)
132adf54 589 goto e_inval;
c9be4a5c 590 if (val != -1 && (val < 1 || val > 255))
132adf54
SH		 591 goto e_inval;
592 inet->uc_ttl = val;
593 break;
594 case IP_HDRINCL:
595 if (sk->sk_type != SOCK_RAW) {
596 err = -ENOPROTOOPT;
2c7946a7 597 break;
132adf54
SH		 598 }
599 inet->hdrincl = val ? 1 : 0;
600 break;
7b2ff18e
JO		 601 case IP_NODEFRAG:
602 if (sk->sk_type != SOCK_RAW) {
603 err = -ENOPROTOOPT;
604 break;
605 }
606 inet->nodefrag = val ? 1 : 0;
607 break;
132adf54 608 case IP_MTU_DISCOVER:
0eae750e 609 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_PROBE)
132adf54
SH		 610 goto e_inval;
611 inet->pmtudisc = val;
612 break;
613 case IP_RECVERR:
614 inet->recverr = !!val;
615 if (!val)
616 skb_queue_purge(&sk->sk_error_queue);
617 break;
618 case IP_MULTICAST_TTL:
619 if (sk->sk_type == SOCK_STREAM)
620 goto e_inval;
4d52cfbe 621 if (optlen < 1)
132adf54 622 goto e_inval;
09cb105e 623 if (val == -1)
132adf54
SH		 624 val = 1;
625 if (val < 0 || val > 255)
626 goto e_inval;
627 inet->mc_ttl = val;
628 break;
629 case IP_MULTICAST_LOOP:
4d52cfbe 630 if (optlen < 1)
132adf54
SH		 631 goto e_inval;
632 inet->mc_loop = !!val;
633 break;
76e21053
EH		 634 case IP_UNICAST_IF:
635 {
636 struct net_device *dev = NULL;
637 int ifindex;
638
639 if (optlen != sizeof(int))
640 goto e_inval;
641
642 ifindex = (__force int)ntohl((__force __be32)val);
643 if (ifindex == 0) {
644 inet->uc_index = 0;
645 err = 0;
646 break;
647 }
648
649 dev = dev_get_by_index(sock_net(sk), ifindex);
650 err = -EADDRNOTAVAIL;
651 if (!dev)
652 break;
653 dev_put(dev);
654
655 err = -EINVAL;
656 if (sk->sk_bound_dev_if)
657 break;
658
659 inet->uc_index = ifindex;
660 err = 0;
661 break;
662 }
132adf54
SH		 663 case IP_MULTICAST_IF:
664 {
665 struct ip_mreqn mreq;
666 struct net_device *dev = NULL;
667
668 if (sk->sk_type == SOCK_STREAM)
669 goto e_inval;
670 /*
671 * Check the arguments are allowable
672 */
673
0915921b
SW		 674 if (optlen < sizeof(struct in_addr))
675 goto e_inval;
676
132adf54
SH		 677 err = -EFAULT;
678 if (optlen >= sizeof(struct ip_mreqn)) {
09cb105e 679 if (copy_from_user(&mreq, optval, sizeof(mreq)))
1da177e4 680 break;
132adf54
SH		 681 } else {
682 memset(&mreq, 0, sizeof(mreq));
3a084ddb
JP		 683 if (optlen >= sizeof(struct ip_mreq)) {
684 if (copy_from_user(&mreq, optval,
685 sizeof(struct ip_mreq)))
686 break;
687 } else if (optlen >= sizeof(struct in_addr)) {
688 if (copy_from_user(&mreq.imr_address, optval,
689 sizeof(struct in_addr)))
690 break;
691 }
132adf54
SH		 692 }
693
694 if (!mreq.imr_ifindex) {
e6f1cebf 695 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) {
132adf54
SH		 696 inet->mc_index = 0;
697 inet->mc_addr = 0;
698 err = 0;
1da177e4
LT		 699 break;
700 }
3b1e0a65 701 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr);
55b80503 702 if (dev)
132adf54 703 mreq.imr_ifindex = dev->ifindex;
132adf54 704 } else
55b80503 705 dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex);
1da177e4 706
1da177e4 707
132adf54
SH		 708 err = -EADDRNOTAVAIL;
709 if (!dev)
710 break;
55b80503 711 dev_put(dev);
132adf54
SH		 712
713 err = -EINVAL;
714 if (sk->sk_bound_dev_if &&
715 mreq.imr_ifindex != sk->sk_bound_dev_if)
716 break;
1da177e4 717
132adf54
SH		 718 inet->mc_index = mreq.imr_ifindex;
719 inet->mc_addr = mreq.imr_address.s_addr;
720 err = 0;
721 break;
722 }
1da177e4 723
132adf54
SH		 724 case IP_ADD_MEMBERSHIP:
725 case IP_DROP_MEMBERSHIP:
726 {
727 struct ip_mreqn mreq;
1da177e4 728
a96fb49b
FL		 729 err = -EPROTO;
730 if (inet_sk(sk)->is_icsk)
731 break;
732
132adf54
SH		 733 if (optlen < sizeof(struct ip_mreq))
734 goto e_inval;
735 err = -EFAULT;
736 if (optlen >= sizeof(struct ip_mreqn)) {
09cb105e 737 if (copy_from_user(&mreq, optval, sizeof(mreq)))
1da177e4 738 break;
132adf54
SH		 739 } else {
740 memset(&mreq, 0, sizeof(mreq));
09cb105e 741 if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq)))
1da177e4 742 break;
132adf54 743 }
1da177e4 744
132adf54
SH		 745 if (optname == IP_ADD_MEMBERSHIP)
746 err = ip_mc_join_group(sk, &mreq);
747 else
748 err = ip_mc_leave_group(sk, &mreq);
749 break;
750 }
751 case IP_MSFILTER:
752 {
132adf54
SH		 753 struct ip_msfilter *msf;
754
755 if (optlen < IP_MSFILTER_SIZE(0))
756 goto e_inval;
757 if (optlen > sysctl_optmem_max) {
758 err = -ENOBUFS;
1da177e4
LT		 759 break;
760 }
132adf54 761 msf = kmalloc(optlen, GFP_KERNEL);
cfcabdcc 762 if (!msf) {
132adf54
SH		 763 err = -ENOBUFS;
764 break;
765 }
766 err = -EFAULT;
767 if (copy_from_user(msf, optval, optlen)) {
768 kfree(msf);
769 break;
770 }
771 /* numsrc >= (1G-4) overflow in 32 bits */
772 if (msf->imsf_numsrc >= 0x3ffffffcU ||
773 msf->imsf_numsrc > sysctl_igmp_max_msf) {
774 kfree(msf);
775 err = -ENOBUFS;
776 break;
777 }
778 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
779 kfree(msf);
780 err = -EINVAL;
781 break;
782 }
783 err = ip_mc_msfilter(sk, msf, 0);
784 kfree(msf);
785 break;
786 }
787 case IP_BLOCK_SOURCE:
788 case IP_UNBLOCK_SOURCE:
789 case IP_ADD_SOURCE_MEMBERSHIP:
790 case IP_DROP_SOURCE_MEMBERSHIP:
791 {
792 struct ip_mreq_source mreqs;
793 int omode, add;
1da177e4 794
132adf54
SH		 795 if (optlen != sizeof(struct ip_mreq_source))
796 goto e_inval;
797 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
1da177e4 798 err = -EFAULT;
1da177e4
LT		 799 break;
800 }
132adf54
SH		 801 if (optname == IP_BLOCK_SOURCE) {
802 omode = MCAST_EXCLUDE;
803 add = 1;
804 } else if (optname == IP_UNBLOCK_SOURCE) {
805 omode = MCAST_EXCLUDE;
806 add = 0;
807 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
808 struct ip_mreqn mreq;
1da177e4 809
132adf54
SH		 810 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
811 mreq.imr_address.s_addr = mreqs.imr_interface;
812 mreq.imr_ifindex = 0;
813 err = ip_mc_join_group(sk, &mreq);
814 if (err && err != -EADDRINUSE)
1da177e4 815 break;
132adf54
SH		 816 omode = MCAST_INCLUDE;
817 add = 1;
818 } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
819 omode = MCAST_INCLUDE;
820 add = 0;
821 }
822 err = ip_mc_source(add, omode, sk, &mreqs, 0);
823 break;
824 }
825 case MCAST_JOIN_GROUP:
826 case MCAST_LEAVE_GROUP:
827 {
828 struct group_req greq;
829 struct sockaddr_in *psin;
830 struct ip_mreqn mreq;
831
832 if (optlen < sizeof(struct group_req))
833 goto e_inval;
834 err = -EFAULT;
835 if (copy_from_user(&greq, optval, sizeof(greq)))
836 break;
837 psin = (struct sockaddr_in *)&greq.gr_group;
838 if (psin->sin_family != AF_INET)
839 goto e_inval;
840 memset(&mreq, 0, sizeof(mreq));
841 mreq.imr_multiaddr = psin->sin_addr;
842 mreq.imr_ifindex = greq.gr_interface;
843
844 if (optname == MCAST_JOIN_GROUP)
845 err = ip_mc_join_group(sk, &mreq);
846 else
847 err = ip_mc_leave_group(sk, &mreq);
848 break;
849 }
850 case MCAST_JOIN_SOURCE_GROUP:
851 case MCAST_LEAVE_SOURCE_GROUP:
852 case MCAST_BLOCK_SOURCE:
853 case MCAST_UNBLOCK_SOURCE:
854 {
855 struct group_source_req greqs;
856 struct ip_mreq_source mreqs;
857 struct sockaddr_in *psin;
858 int omode, add;
859
860 if (optlen != sizeof(struct group_source_req))
861 goto e_inval;
862 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
1da177e4 863 err = -EFAULT;
1da177e4
LT		 864 break;
865 }
132adf54
SH		 866 if (greqs.gsr_group.ss_family != AF_INET ||
867 greqs.gsr_source.ss_family != AF_INET) {
868 err = -EADDRNOTAVAIL;
1da177e4
LT		 869 break;
870 }
132adf54
SH		 871 psin = (struct sockaddr_in *)&greqs.gsr_group;
872 mreqs.imr_multiaddr = psin->sin_addr.s_addr;
873 psin = (struct sockaddr_in *)&greqs.gsr_source;
874 mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
875 mreqs.imr_interface = 0; /* use index for mc_source */
876
877 if (optname == MCAST_BLOCK_SOURCE) {
878 omode = MCAST_EXCLUDE;
879 add = 1;
880 } else if (optname == MCAST_UNBLOCK_SOURCE) {
881 omode = MCAST_EXCLUDE;
882 add = 0;
883 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
1da177e4
LT		 884 struct ip_mreqn mreq;
885
132adf54 886 psin = (struct sockaddr_in *)&greqs.gsr_group;
1da177e4 887 mreq.imr_multiaddr = psin->sin_addr;
132adf54
SH		 888 mreq.imr_address.s_addr = 0;
889 mreq.imr_ifindex = greqs.gsr_interface;
890 err = ip_mc_join_group(sk, &mreq);
891 if (err && err != -EADDRINUSE)
892 break;
893 greqs.gsr_interface = mreq.imr_ifindex;
894 omode = MCAST_INCLUDE;
895 add = 1;
896 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
897 omode = MCAST_INCLUDE;
898 add = 0;
899 }
900 err = ip_mc_source(add, omode, sk, &mreqs,
901 greqs.gsr_interface);
902 break;
903 }
904 case MCAST_MSFILTER:
905 {
132adf54
SH		 906 struct sockaddr_in *psin;
907 struct ip_msfilter *msf = NULL;
908 struct group_filter *gsf = NULL;
909 int msize, i, ifindex;
910
911 if (optlen < GROUP_FILTER_SIZE(0))
912 goto e_inval;
913 if (optlen > sysctl_optmem_max) {
914 err = -ENOBUFS;
1da177e4
LT		 915 break;
916 }
09cb105e 917 gsf = kmalloc(optlen, GFP_KERNEL);
cfcabdcc 918 if (!gsf) {
132adf54 919 err = -ENOBUFS;
1da177e4
LT		 920 break;
921 }
132adf54 922 err = -EFAULT;
4d52cfbe 923 if (copy_from_user(gsf, optval, optlen))
132adf54 924 goto mc_msf_out;
4d52cfbe 925
132adf54
SH		 926 /* numsrc >= (4G-140)/128 overflow in 32 bits */
927 if (gsf->gf_numsrc >= 0x1ffffff ||
928 gsf->gf_numsrc > sysctl_igmp_max_msf) {
929 err = -ENOBUFS;
930 goto mc_msf_out;
931 }
932 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
933 err = -EINVAL;
934 goto mc_msf_out;
935 }
936 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
09cb105e 937 msf = kmalloc(msize, GFP_KERNEL);
cfcabdcc 938 if (!msf) {
132adf54
SH		 939 err = -ENOBUFS;
940 goto mc_msf_out;
941 }
942 ifindex = gsf->gf_interface;
943 psin = (struct sockaddr_in *)&gsf->gf_group;
944 if (psin->sin_family != AF_INET) {
1da177e4 945 err = -EADDRNOTAVAIL;
132adf54 946 goto mc_msf_out;
1da177e4 947 }
132adf54
SH		 948 msf->imsf_multiaddr = psin->sin_addr.s_addr;
949 msf->imsf_interface = 0;
950 msf->imsf_fmode = gsf->gf_fmode;
951 msf->imsf_numsrc = gsf->gf_numsrc;
952 err = -EADDRNOTAVAIL;
4d52cfbe 953 for (i = 0; i < gsf->gf_numsrc; ++i) {
132adf54 954 psin = (struct sockaddr_in *)&gsf->gf_slist[i];
e905a9ed 955
132adf54
SH		 956 if (psin->sin_family != AF_INET)
957 goto mc_msf_out;
958 msf->imsf_slist[i] = psin->sin_addr.s_addr;
959 }
960 kfree(gsf);
961 gsf = NULL;
962
963 err = ip_mc_msfilter(sk, msf, ifindex);
4d52cfbe 964mc_msf_out:
132adf54
SH		 965 kfree(msf);
966 kfree(gsf);
967 break;
968 }
f771bef9
NS		 969 case IP_MULTICAST_ALL:
970 if (optlen < 1)
971 goto e_inval;
972 if (val != 0 && val != 1)
973 goto e_inval;
974 inet->mc_all = val;
975 break;
132adf54
SH		 976 case IP_ROUTER_ALERT:
977 err = ip_ra_control(sk, val ? 1 : 0, NULL);
978 break;
979
980 case IP_FREEBIND:
4d52cfbe 981 if (optlen < 1)
132adf54
SH		 982 goto e_inval;
983 inet->freebind = !!val;
984 break;
985
986 case IP_IPSEC_POLICY:
987 case IP_XFRM_POLICY:
988 err = -EPERM;
52e804c6 989 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1da177e4 990 break;
132adf54
SH		 991 err = xfrm_user_policy(sk, optname, optval, optlen);
992 break;
1da177e4 993
f5715aea 994 case IP_TRANSPARENT:
52e804c6
EB		 995 if (!!val && !ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) &&
996 !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
f5715aea
KK		 997 err = -EPERM;
998 break;
999 }
1000 if (optlen < 1)
1001 goto e_inval;
1002 inet->transparent = !!val;
1003 break;
1004
d218d111
SH		 1005 case IP_MINTTL:
1006 if (optlen < 1)
1007 goto e_inval;
1008 if (val < 0 || val > 255)
1009 goto e_inval;
1010 inet->min_ttl = val;
1011 break;
1012
132adf54
SH		 1013 default:
1014 err = -ENOPROTOOPT;
1015 break;
1da177e4
LT		 1016 }
1017 release_sock(sk);
1018 return err;
1019
1020e_inval:
1021 release_sock(sk);
1022 return -EINVAL;
1023}
1024
f84af32c 1025/**
d826eb14 1026 * ipv4_pktinfo_prepare - transfert some info from rtable to skb
f84af32c
ED		 1027 * @sk: socket
1028 * @skb: buffer
1029 *
35ebf65e
DM		 1030 * To support IP_CMSG_PKTINFO option, we store rt_iif and specific
1031 * destination in skb->cb[] before dst drop.
d826eb14 1032 * This way, receiver doesnt make cache line misses to read rtable.
f84af32c 1033 */
d826eb14 1034void ipv4_pktinfo_prepare(struct sk_buff *skb)
f84af32c 1035{
d826eb14 1036 struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb);
d826eb14 1037
92101b3b
DM		 1038 if (skb_rtable(skb)) {
1039 pktinfo->ipi_ifindex = inet_iif(skb);
35ebf65e 1040 pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb);
d826eb14
ED		 1041 } else {
1042 pktinfo->ipi_ifindex = 0;
1043 pktinfo->ipi_spec_dst.s_addr = 0;
1044 }
050c3097
ED		 1045 /* We need to keep the dst for __ip_options_echo()
1046 * We could restrict the test to opt.ts_needtime || opt.srr,
1047 * but the following is good enough as IP options are not often used.
1048 */
1049 if (unlikely(IPCB(skb)->opt.optlen))
1050 skb_dst_force(skb);
1051 else
1052 skb_dst_drop(skb);
f84af32c 1053}
f84af32c 1054
3fdadf7d 1055int ip_setsockopt(struct sock *sk, int level,
b7058842 1056 int optname, char __user *optval, unsigned int optlen)
3fdadf7d
DM		 1057{
1058 int err;
1059
1060 if (level != SOL_IP)
1061 return -ENOPROTOOPT;
1062
1063 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1064#ifdef CONFIG_NETFILTER
1065 /* we need to exclude all possible ENOPROTOOPTs except default case */
1066 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
6a9fb947
PE		 1067 optname != IP_IPSEC_POLICY &&
1068 optname != IP_XFRM_POLICY &&
1069 !ip_mroute_opt(optname)) {
3fdadf7d
DM		 1070 lock_sock(sk);
1071 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
1072 release_sock(sk);
1073 }
1074#endif
1075 return err;
1076}
4d52cfbe 1077EXPORT_SYMBOL(ip_setsockopt);
3fdadf7d
DM		 1078
1079#ifdef CONFIG_COMPAT
543d9cfe 1080int compat_ip_setsockopt(struct sock *sk, int level, int optname,
b7058842 1081 char __user *optval, unsigned int optlen)
3fdadf7d
DM		 1082{
1083 int err;
1084
1085 if (level != SOL_IP)
1086 return -ENOPROTOOPT;
1087
dae50295
DS		 1088 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
1089 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
1090 ip_setsockopt);
1091
3fdadf7d
DM		 1092 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1093#ifdef CONFIG_NETFILTER
1094 /* we need to exclude all possible ENOPROTOOPTs except default case */
1095 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
6a9fb947
PE		 1096 optname != IP_IPSEC_POLICY &&
1097 optname != IP_XFRM_POLICY &&
1098 !ip_mroute_opt(optname)) {
3fdadf7d 1099 lock_sock(sk);
543d9cfe
ACM		 1100 err = compat_nf_setsockopt(sk, PF_INET, optname,
1101 optval, optlen);
3fdadf7d
DM		 1102 release_sock(sk);
1103 }
1104#endif
1105 return err;
1106}
543d9cfe 1107EXPORT_SYMBOL(compat_ip_setsockopt);
3fdadf7d
DM		 1108#endif
1109
1da177e4 1110/*
4d52cfbe
ED		 1111 * Get the options. Note for future reference. The GET of IP options gets
1112 * the _received_ ones. The set sets the _sent_ ones.
1da177e4
LT		 1113 */
1114
3fdadf7d 1115static int do_ip_getsockopt(struct sock *sk, int level, int optname,
95c96174 1116 char __user *optval, int __user *optlen, unsigned int flags)
1da177e4
LT		 1117{
1118 struct inet_sock *inet = inet_sk(sk);
1119 int val;
1120 int len;
e905a9ed 1121
132adf54 1122 if (level != SOL_IP)
1da177e4
LT		 1123 return -EOPNOTSUPP;
1124
6a9fb947 1125 if (ip_mroute_opt(optname))
09cb105e 1126 return ip_mroute_getsockopt(sk, optname, optval, optlen);
1da177e4 1127
09cb105e 1128 if (get_user(len, optlen))
1da177e4 1129 return -EFAULT;
132adf54 1130 if (len < 0)
1da177e4 1131 return -EINVAL;
e905a9ed 1132
1da177e4
LT		 1133 lock_sock(sk);
1134
132adf54
SH		 1135 switch (optname) {
1136 case IP_OPTIONS:
1137 {
1138 unsigned char optbuf[sizeof(struct ip_options)+40];
f6d8bd05
ED		 1139 struct ip_options *opt = (struct ip_options *)optbuf;
1140 struct ip_options_rcu *inet_opt;
1141
1142 inet_opt = rcu_dereference_protected(inet->inet_opt,
1143 sock_owned_by_user(sk));
132adf54 1144 opt->optlen = 0;
f6d8bd05
ED		 1145 if (inet_opt)
1146 memcpy(optbuf, &inet_opt->opt,
1147 sizeof(struct ip_options) +
1148 inet_opt->opt.optlen);
132adf54
SH		 1149 release_sock(sk);
1150
1151 if (opt->optlen == 0)
1152 return put_user(0, optlen);
1153
1154 ip_options_undo(opt);
1155
1156 len = min_t(unsigned int, len, opt->optlen);
1157 if (put_user(len, optlen))
1158 return -EFAULT;
1159 if (copy_to_user(optval, opt->__data, len))
1160 return -EFAULT;
1161 return 0;
1162 }
1163 case IP_PKTINFO:
1164 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
1165 break;
1166 case IP_RECVTTL:
1167 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
1168 break;
1169 case IP_RECVTOS:
1170 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
1171 break;
1172 case IP_RECVOPTS:
1173 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
1174 break;
1175 case IP_RETOPTS:
1176 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
1177 break;
1178 case IP_PASSSEC:
1179 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
1180 break;
e8b2dfe9
BS		 1181 case IP_RECVORIGDSTADDR:
1182 val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0;
1183 break;
132adf54
SH		 1184 case IP_TOS:
1185 val = inet->tos;
1186 break;
1187 case IP_TTL:
1188 val = (inet->uc_ttl == -1 ?
1189 sysctl_ip_default_ttl :
1190 inet->uc_ttl);
1191 break;
1192 case IP_HDRINCL:
1193 val = inet->hdrincl;
1194 break;
a89b4763
MK		 1195 case IP_NODEFRAG:
1196 val = inet->nodefrag;
1197 break;
132adf54
SH		 1198 case IP_MTU_DISCOVER:
1199 val = inet->pmtudisc;
1200 break;
1201 case IP_MTU:
1202 {
1203 struct dst_entry *dst;
1204 val = 0;
1205 dst = sk_dst_get(sk);
1206 if (dst) {
1207 val = dst_mtu(dst);
1208 dst_release(dst);
1da177e4 1209 }
132adf54 1210 if (!val) {
1da177e4 1211 release_sock(sk);
132adf54 1212 return -ENOTCONN;
1da177e4 1213 }
132adf54
SH		 1214 break;
1215 }
1216 case IP_RECVERR:
1217 val = inet->recverr;
1218 break;
1219 case IP_MULTICAST_TTL:
1220 val = inet->mc_ttl;
1221 break;
1222 case IP_MULTICAST_LOOP:
1223 val = inet->mc_loop;
1224 break;
76e21053
EH		 1225 case IP_UNICAST_IF:
1226 val = (__force int)htonl((__u32) inet->uc_index);
1227 break;
132adf54
SH		 1228 case IP_MULTICAST_IF:
1229 {
1230 struct in_addr addr;
1231 len = min_t(unsigned int, len, sizeof(struct in_addr));
1232 addr.s_addr = inet->mc_addr;
1233 release_sock(sk);
1da177e4 1234
132adf54
SH		 1235 if (put_user(len, optlen))
1236 return -EFAULT;
1237 if (copy_to_user(optval, &addr, len))
1238 return -EFAULT;
1239 return 0;
1240 }
1241 case IP_MSFILTER:
1242 {
1243 struct ip_msfilter msf;
1244 int err;
1245
1246 if (len < IP_MSFILTER_SIZE(0)) {
1da177e4 1247 release_sock(sk);
132adf54 1248 return -EINVAL;
1da177e4 1249 }
132adf54 1250 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
1da177e4 1251 release_sock(sk);
132adf54 1252 return -EFAULT;
1da177e4 1253 }
132adf54
SH		 1254 err = ip_mc_msfget(sk, &msf,
1255 (struct ip_msfilter __user *)optval, optlen);
1256 release_sock(sk);
1257 return err;
1258 }
1259 case MCAST_MSFILTER:
1260 {
1261 struct group_filter gsf;
1262 int err;
1da177e4 1263
132adf54 1264 if (len < GROUP_FILTER_SIZE(0)) {
1da177e4 1265 release_sock(sk);
132adf54
SH		 1266 return -EINVAL;
1267 }
1268 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
1269 release_sock(sk);
1270 return -EFAULT;
1271 }
1272 err = ip_mc_gsfget(sk, &gsf,
4d52cfbe
ED		 1273 (struct group_filter __user *)optval,
1274 optlen);
132adf54
SH		 1275 release_sock(sk);
1276 return err;
1277 }
f771bef9
NS		 1278 case IP_MULTICAST_ALL:
1279 val = inet->mc_all;
1280 break;
132adf54
SH		 1281 case IP_PKTOPTIONS:
1282 {
1283 struct msghdr msg;
1da177e4 1284
132adf54 1285 release_sock(sk);
1da177e4 1286
132adf54
SH		 1287 if (sk->sk_type != SOCK_STREAM)
1288 return -ENOPROTOOPT;
1da177e4 1289
132adf54
SH		 1290 msg.msg_control = optval;
1291 msg.msg_controllen = len;
dd23198e 1292 msg.msg_flags = flags;
1da177e4 1293
132adf54
SH		 1294 if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
1295 struct in_pktinfo info;
1296
c720c7e8
ED		 1297 info.ipi_addr.s_addr = inet->inet_rcv_saddr;
1298 info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr;
132adf54
SH		 1299 info.ipi_ifindex = inet->mc_index;
1300 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
1da177e4 1301 }
132adf54
SH		 1302 if (inet->cmsg_flags & IP_CMSG_TTL) {
1303 int hlim = inet->mc_ttl;
1304 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
1305 }
4c507d28
JB		 1306 if (inet->cmsg_flags & IP_CMSG_TOS) {
1307 int tos = inet->rcv_tos;
1308 put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos);
1309 }
132adf54
SH		 1310 len -= msg.msg_controllen;
1311 return put_user(len, optlen);
1312 }
1313 case IP_FREEBIND:
1314 val = inet->freebind;
1315 break;
f5715aea
KK		 1316 case IP_TRANSPARENT:
1317 val = inet->transparent;
1318 break;
d218d111
SH		 1319 case IP_MINTTL:
1320 val = inet->min_ttl;
1321 break;
132adf54
SH		 1322 default:
1323 release_sock(sk);
1324 return -ENOPROTOOPT;
1da177e4
LT		 1325 }
1326 release_sock(sk);
e905a9ed 1327
4d52cfbe 1328 if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) {
1da177e4
LT		 1329 unsigned char ucval = (unsigned char)val;
1330 len = 1;
132adf54 1331 if (put_user(len, optlen))
1da177e4 1332 return -EFAULT;
09cb105e 1333 if (copy_to_user(optval, &ucval, 1))
1da177e4
LT		 1334 return -EFAULT;
1335 } else {
1336 len = min_t(unsigned int, sizeof(int), len);
132adf54 1337 if (put_user(len, optlen))
1da177e4 1338 return -EFAULT;
09cb105e 1339 if (copy_to_user(optval, &val, len))
1da177e4
LT		 1340 return -EFAULT;
1341 }
1342 return 0;
1343}
1344
3fdadf7d 1345int ip_getsockopt(struct sock *sk, int level,
132adf54 1346 int optname, char __user *optval, int __user *optlen)
3fdadf7d
DM		 1347{
1348 int err;
1349
dd23198e 1350 err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0);
3fdadf7d
DM		 1351#ifdef CONFIG_NETFILTER
1352 /* we need to exclude all possible ENOPROTOOPTs except default case */
6a9fb947
PE		 1353 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1354 !ip_mroute_opt(optname)) {
e905a9ed 1355 int len;
3fdadf7d 1356
09cb105e 1357 if (get_user(len, optlen))
3fdadf7d
DM		 1358 return -EFAULT;
1359
1360 lock_sock(sk);
1361 err = nf_getsockopt(sk, PF_INET, optname, optval,
1362 &len);
1363 release_sock(sk);
1364 if (err >= 0)
1365 err = put_user(len, optlen);
1366 return err;
1367 }
1368#endif
1369 return err;
1370}
4d52cfbe 1371EXPORT_SYMBOL(ip_getsockopt);
3fdadf7d
DM		 1372
1373#ifdef CONFIG_COMPAT
543d9cfe
ACM		 1374int compat_ip_getsockopt(struct sock *sk, int level, int optname,
1375 char __user *optval, int __user *optlen)
3fdadf7d 1376{
42908c69
DS		 1377 int err;
1378
1379 if (optname == MCAST_MSFILTER)
1380 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1381 ip_getsockopt);
1382
dd23198e
DB		 1383 err = do_ip_getsockopt(sk, level, optname, optval, optlen,
1384 MSG_CMSG_COMPAT);
42908c69 1385
3fdadf7d
DM		 1386#ifdef CONFIG_NETFILTER
1387 /* we need to exclude all possible ENOPROTOOPTs except default case */
6a9fb947
PE		 1388 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1389 !ip_mroute_opt(optname)) {
e905a9ed 1390 int len;
3fdadf7d 1391
543d9cfe 1392 if (get_user(len, optlen))
3fdadf7d
DM		 1393 return -EFAULT;
1394
1395 lock_sock(sk);
543d9cfe 1396 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
3fdadf7d
DM		 1397 release_sock(sk);
1398 if (err >= 0)
1399 err = put_user(len, optlen);
1400 return err;
1401 }
1402#endif
1403 return err;
1404}
543d9cfe 1405EXPORT_SYMBOL(compat_ip_getsockopt);
3fdadf7d 1406#endif
kernel source for telekom puls (alcatel/mediatek)