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include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit...
[linux-2.6-block.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>
36#include <net/route.h>
37#include <net/xfrm.h>
dae50295 38#include <net/compat.h>
1da177e4
LT		 39#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
40#include <net/transp_v6.h>
41#endif
42
43#include <linux/errqueue.h>
44#include <asm/uaccess.h>
45
46#define IP_CMSG_PKTINFO 1
47#define IP_CMSG_TTL 2
48#define IP_CMSG_TOS 4
49#define IP_CMSG_RECVOPTS 8
50#define IP_CMSG_RETOPTS 16
2c7946a7 51#define IP_CMSG_PASSSEC 32
e8b2dfe9 52#define IP_CMSG_ORIGDSTADDR 64
1da177e4
LT		 53
54/*
55 * SOL_IP control messages.
56 */
57
58static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb)
59{
60 struct in_pktinfo info;
511c3f92 61 struct rtable *rt = skb_rtable(skb);
1da177e4 62
eddc9ec5 63 info.ipi_addr.s_addr = ip_hdr(skb)->daddr;
1da177e4
LT		 64 if (rt) {
65 info.ipi_ifindex = rt->rt_iif;
66 info.ipi_spec_dst.s_addr = rt->rt_spec_dst;
67 } else {
68 info.ipi_ifindex = 0;
69 info.ipi_spec_dst.s_addr = 0;
70 }
71
72 put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
73}
74
75static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb)
76{
eddc9ec5 77 int ttl = ip_hdr(skb)->ttl;
1da177e4
LT		 78 put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl);
79}
80
81static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb)
82{
eddc9ec5 83 put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos);
1da177e4
LT		 84}
85
86static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb)
87{
88 if (IPCB(skb)->opt.optlen == 0)
89 return;
90
eddc9ec5
ACM		 91 put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen,
92 ip_hdr(skb) + 1);
1da177e4
LT		 93}
94
95
96static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb)
97{
98 unsigned char optbuf[sizeof(struct ip_options) + 40];
09cb105e 99 struct ip_options * opt = (struct ip_options *)optbuf;
1da177e4
LT		 100
101 if (IPCB(skb)->opt.optlen == 0)
102 return;
103
104 if (ip_options_echo(opt, skb)) {
105 msg->msg_flags |= MSG_CTRUNC;
106 return;
107 }
108 ip_options_undo(opt);
109
110 put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data);
111}
112
2c7946a7
CZ		 113static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
114{
115 char *secdata;
dc49c1f9 116 u32 seclen, secid;
2c7946a7
CZ		 117 int err;
118
dc49c1f9
CZ		 119 err = security_socket_getpeersec_dgram(NULL, skb, &secid);
120 if (err)
121 return;
122
123 err = security_secid_to_secctx(secid, &secdata, &seclen);
2c7946a7
CZ		 124 if (err)
125 return;
126
127 put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata);
dc49c1f9 128 security_release_secctx(secdata, seclen);
2c7946a7
CZ		 129}
130
21d1a161 131static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb)
e8b2dfe9
BS		 132{
133 struct sockaddr_in sin;
134 struct iphdr *iph = ip_hdr(skb);
21d1a161 135 __be16 *ports = (__be16 *)skb_transport_header(skb);
e8b2dfe9
BS		 136
137 if (skb_transport_offset(skb) + 4 > skb->len)
138 return;
139
140 /* All current transport protocols have the port numbers in the
141 * first four bytes of the transport header and this function is
142 * written with this assumption in mind.
143 */
144
145 sin.sin_family = AF_INET;
146 sin.sin_addr.s_addr = iph->daddr;
147 sin.sin_port = ports[1];
148 memset(sin.sin_zero, 0, sizeof(sin.sin_zero));
149
150 put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin);
151}
1da177e4
LT		 152
153void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
154{
155 struct inet_sock *inet = inet_sk(skb->sk);
156 unsigned flags = inet->cmsg_flags;
157
158 /* Ordered by supposed usage frequency */
159 if (flags & 1)
160 ip_cmsg_recv_pktinfo(msg, skb);
4d52cfbe 161 if ((flags >>= 1) == 0)
1da177e4
LT		 162 return;
163
164 if (flags & 1)
165 ip_cmsg_recv_ttl(msg, skb);
4d52cfbe 166 if ((flags >>= 1) == 0)
1da177e4
LT		 167 return;
168
169 if (flags & 1)
170 ip_cmsg_recv_tos(msg, skb);
4d52cfbe 171 if ((flags >>= 1) == 0)
1da177e4
LT		 172 return;
173
174 if (flags & 1)
175 ip_cmsg_recv_opts(msg, skb);
4d52cfbe 176 if ((flags >>= 1) == 0)
1da177e4
LT		 177 return;
178
179 if (flags & 1)
180 ip_cmsg_recv_retopts(msg, skb);
4d52cfbe 181 if ((flags >>= 1) == 0)
2c7946a7
CZ		 182 return;
183
184 if (flags & 1)
185 ip_cmsg_recv_security(msg, skb);
e8b2dfe9 186
4d52cfbe 187 if ((flags >>= 1) == 0)
e8b2dfe9
BS		 188 return;
189 if (flags & 1)
190 ip_cmsg_recv_dstaddr(msg, skb);
191
1da177e4 192}
4d52cfbe 193EXPORT_SYMBOL(ip_cmsg_recv);
1da177e4 194
7a6adb92 195int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc)
1da177e4
LT		 196{
197 int err;
198 struct cmsghdr *cmsg;
199
200 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
201 if (!CMSG_OK(msg, cmsg))
202 return -EINVAL;
203 if (cmsg->cmsg_level != SOL_IP)
204 continue;
205 switch (cmsg->cmsg_type) {
206 case IP_RETOPTS:
207 err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
4d52cfbe
ED		 208 err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg),
209 err < 40 ? err : 40);
1da177e4
LT		 210 if (err)
211 return err;
212 break;
213 case IP_PKTINFO:
214 {
215 struct in_pktinfo *info;
216 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
217 return -EINVAL;
218 info = (struct in_pktinfo *)CMSG_DATA(cmsg);
219 ipc->oif = info->ipi_ifindex;
220 ipc->addr = info->ipi_spec_dst.s_addr;
221 break;
222 }
223 default:
224 return -EINVAL;
225 }
226 }
227 return 0;
228}
229
230
231/* Special input handler for packets caught by router alert option.
232 They are selected only by protocol field, and then processed likely
233 local ones; but only if someone wants them! Otherwise, router
234 not running rsvpd will kill RSVP.
235
236 It is user level problem, what it will make with them.
237 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
238 but receiver should be enough clever f.e. to forward mtrace requests,
239 sent to multicast group to reach destination designated router.
240 */
241struct ip_ra_chain *ip_ra_chain;
242DEFINE_RWLOCK(ip_ra_lock);
243
4d52cfbe
ED		 244int ip_ra_control(struct sock *sk, unsigned char on,
245 void (*destructor)(struct sock *))
1da177e4
LT		 246{
247 struct ip_ra_chain *ra, *new_ra, **rap;
248
c720c7e8 249 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW)
1da177e4
LT		 250 return -EINVAL;
251
252 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
253
254 write_lock_bh(&ip_ra_lock);
4d52cfbe 255 for (rap = &ip_ra_chain; (ra = *rap) != NULL; rap = &ra->next) {
1da177e4
LT		 256 if (ra->sk == sk) {
257 if (on) {
258 write_unlock_bh(&ip_ra_lock);
a51482bd 259 kfree(new_ra);
1da177e4
LT		 260 return -EADDRINUSE;
261 }
262 *rap = ra->next;
263 write_unlock_bh(&ip_ra_lock);
264
265 if (ra->destructor)
266 ra->destructor(sk);
267 sock_put(sk);
268 kfree(ra);
269 return 0;
270 }
271 }
272 if (new_ra == NULL) {
273 write_unlock_bh(&ip_ra_lock);
274 return -ENOBUFS;
275 }
276 new_ra->sk = sk;
277 new_ra->destructor = destructor;
278
279 new_ra->next = ra;
280 *rap = new_ra;
281 sock_hold(sk);
282 write_unlock_bh(&ip_ra_lock);
283
284 return 0;
285}
286
e905a9ed 287void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
35986b32 288 __be16 port, u32 info, u8 *payload)
1da177e4
LT		 289{
290 struct inet_sock *inet = inet_sk(sk);
291 struct sock_exterr_skb *serr;
292
293 if (!inet->recverr)
294 return;
295
296 skb = skb_clone(skb, GFP_ATOMIC);
297 if (!skb)
298 return;
299
e905a9ed 300 serr = SKB_EXT_ERR(skb);
1da177e4
LT		 301 serr->ee.ee_errno = err;
302 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
88c7664f
ACM		 303 serr->ee.ee_type = icmp_hdr(skb)->type;
304 serr->ee.ee_code = icmp_hdr(skb)->code;
1da177e4
LT		 305 serr->ee.ee_pad = 0;
306 serr->ee.ee_info = info;
307 serr->ee.ee_data = 0;
88c7664f 308 serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) -
d56f90a7 309 skb_network_header(skb);
1da177e4
LT		 310 serr->port = port;
311
bd82393c
ACM		 312 if (skb_pull(skb, payload - skb->data) != NULL) {
313 skb_reset_transport_header(skb);
314 if (sock_queue_err_skb(sk, skb) == 0)
315 return;
316 }
317 kfree_skb(skb);
1da177e4
LT		 318}
319
0579016e 320void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info)
1da177e4
LT		 321{
322 struct inet_sock *inet = inet_sk(sk);
323 struct sock_exterr_skb *serr;
324 struct iphdr *iph;
325 struct sk_buff *skb;
326
327 if (!inet->recverr)
328 return;
329
330 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
331 if (!skb)
332 return;
333
2ca9e6f2
ACM		 334 skb_put(skb, sizeof(struct iphdr));
335 skb_reset_network_header(skb);
eddc9ec5 336 iph = ip_hdr(skb);
1da177e4
LT		 337 iph->daddr = daddr;
338
e905a9ed 339 serr = SKB_EXT_ERR(skb);
1da177e4
LT		 340 serr->ee.ee_errno = err;
341 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
e905a9ed 342 serr->ee.ee_type = 0;
1da177e4
LT		 343 serr->ee.ee_code = 0;
344 serr->ee.ee_pad = 0;
345 serr->ee.ee_info = info;
346 serr->ee.ee_data = 0;
d56f90a7 347 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
1da177e4
LT		 348 serr->port = port;
349
27a884dc 350 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
bd82393c 351 skb_reset_transport_header(skb);
1da177e4
LT		 352
353 if (sock_queue_err_skb(sk, skb))
354 kfree_skb(skb);
355}
356
e905a9ed 357/*
1da177e4
LT		 358 * Handle MSG_ERRQUEUE
359 */
360int ip_recv_error(struct sock *sk, struct msghdr *msg, int len)
361{
362 struct sock_exterr_skb *serr;
363 struct sk_buff *skb, *skb2;
364 struct sockaddr_in *sin;
365 struct {
366 struct sock_extended_err ee;
367 struct sockaddr_in offender;
368 } errhdr;
369 int err;
370 int copied;
371
372 err = -EAGAIN;
373 skb = skb_dequeue(&sk->sk_error_queue);
374 if (skb == NULL)
375 goto out;
376
377 copied = skb->len;
378 if (copied > len) {
379 msg->msg_flags |= MSG_TRUNC;
380 copied = len;
381 }
382 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
383 if (err)
384 goto out_free_skb;
385
386 sock_recv_timestamp(msg, sk, skb);
387
388 serr = SKB_EXT_ERR(skb);
389
390 sin = (struct sockaddr_in *)msg->msg_name;
391 if (sin) {
392 sin->sin_family = AF_INET;
d56f90a7
ACM		 393 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) +
394 serr->addr_offset);
1da177e4
LT		 395 sin->sin_port = serr->port;
396 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
397 }
398
399 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
400 sin = &errhdr.offender;
401 sin->sin_family = AF_UNSPEC;
402 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) {
403 struct inet_sock *inet = inet_sk(sk);
404
405 sin->sin_family = AF_INET;
eddc9ec5 406 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
1da177e4
LT		 407 sin->sin_port = 0;
408 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
409 if (inet->cmsg_flags)
410 ip_cmsg_recv(msg, skb);
411 }
412
413 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
414
415 /* Now we could try to dump offended packet options */
416
417 msg->msg_flags |= MSG_ERRQUEUE;
418 err = copied;
419
420 /* Reset and regenerate socket error */
e0f9f858 421 spin_lock_bh(&sk->sk_error_queue.lock);
1da177e4 422 sk->sk_err = 0;
4d52cfbe
ED		 423 skb2 = skb_peek(&sk->sk_error_queue);
424 if (skb2 != NULL) {
1da177e4 425 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
e0f9f858 426 spin_unlock_bh(&sk->sk_error_queue.lock);
1da177e4
LT		 427 sk->sk_error_report(sk);
428 } else
e0f9f858 429 spin_unlock_bh(&sk->sk_error_queue.lock);
1da177e4 430
e905a9ed 431out_free_skb:
1da177e4
LT		 432 kfree_skb(skb);
433out:
434 return err;
435}
436
437
438/*
4d52cfbe
ED		 439 * Socket option code for IP. This is the end of the line after any
440 * TCP,UDP etc options on an IP socket.
1da177e4
LT		 441 */
442
3fdadf7d 443static int do_ip_setsockopt(struct sock *sk, int level,
b7058842 444 int optname, char __user *optval, unsigned int optlen)
1da177e4
LT		 445{
446 struct inet_sock *inet = inet_sk(sk);
09cb105e 447 int val = 0, err;
1da177e4 448
e905a9ed 449 if (((1<<optname) & ((1<<IP_PKTINFO) | (1<<IP_RECVTTL) |
132adf54
SH		 450 (1<<IP_RECVOPTS) | (1<<IP_RECVTOS) |
451 (1<<IP_RETOPTS) | (1<<IP_TOS) |
452 (1<<IP_TTL) | (1<<IP_HDRINCL) |
453 (1<<IP_MTU_DISCOVER) | (1<<IP_RECVERR) |
454 (1<<IP_ROUTER_ALERT) | (1<<IP_FREEBIND) |
d218d111
SH		 455 (1<<IP_PASSSEC) | (1<<IP_TRANSPARENT) |
456 (1<<IP_MINTTL))) ||
132adf54 457 optname == IP_MULTICAST_TTL ||
f771bef9 458 optname == IP_MULTICAST_ALL ||
e8b2dfe9
BS		 459 optname == IP_MULTICAST_LOOP ||
460 optname == IP_RECVORIGDSTADDR) {
1da177e4
LT		 461 if (optlen >= sizeof(int)) {
462 if (get_user(val, (int __user *) optval))
463 return -EFAULT;
464 } else if (optlen >= sizeof(char)) {
465 unsigned char ucval;
466
467 if (get_user(ucval, (unsigned char __user *) optval))
468 return -EFAULT;
469 val = (int) ucval;
470 }
471 }
472
473 /* If optlen==0, it is equivalent to val == 0 */
474
6a9fb947 475 if (ip_mroute_opt(optname))
09cb105e 476 return ip_mroute_setsockopt(sk, optname, optval, optlen);
1da177e4
LT		 477
478 err = 0;
479 lock_sock(sk);
480
481 switch (optname) {
132adf54
SH		 482 case IP_OPTIONS:
483 {
4d52cfbe 484 struct ip_options *opt = NULL;
65a1c4ff 485 if (optlen > 40)
132adf54 486 goto e_inval;
3b1e0a65 487 err = ip_options_get_from_user(sock_net(sk), &opt,
cb84663e 488 optval, optlen);
132adf54
SH		 489 if (err)
490 break;
491 if (inet->is_icsk) {
492 struct inet_connection_sock *icsk = inet_csk(sk);
1da177e4 493#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
132adf54
SH		 494 if (sk->sk_family == PF_INET ||
495 (!((1 << sk->sk_state) &
496 (TCPF_LISTEN | TCPF_CLOSE)) &&
c720c7e8 497 inet->inet_daddr != LOOPBACK4_IPV6)) {
1da177e4 498#endif
132adf54
SH		 499 if (inet->opt)
500 icsk->icsk_ext_hdr_len -= inet->opt->optlen;
501 if (opt)
502 icsk->icsk_ext_hdr_len += opt->optlen;
503 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
1da177e4 504#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1da177e4 505 }
132adf54 506#endif
1da177e4 507 }
132adf54
SH		 508 opt = xchg(&inet->opt, opt);
509 kfree(opt);
510 break;
511 }
512 case IP_PKTINFO:
513 if (val)
514 inet->cmsg_flags |= IP_CMSG_PKTINFO;
515 else
516 inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
517 break;
518 case IP_RECVTTL:
519 if (val)
520 inet->cmsg_flags |= IP_CMSG_TTL;
521 else
522 inet->cmsg_flags &= ~IP_CMSG_TTL;
523 break;
524 case IP_RECVTOS:
525 if (val)
526 inet->cmsg_flags |= IP_CMSG_TOS;
527 else
528 inet->cmsg_flags &= ~IP_CMSG_TOS;
529 break;
530 case IP_RECVOPTS:
531 if (val)
532 inet->cmsg_flags |= IP_CMSG_RECVOPTS;
533 else
534 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
535 break;
536 case IP_RETOPTS:
537 if (val)
538 inet->cmsg_flags |= IP_CMSG_RETOPTS;
539 else
540 inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
541 break;
542 case IP_PASSSEC:
543 if (val)
544 inet->cmsg_flags |= IP_CMSG_PASSSEC;
545 else
546 inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
547 break;
e8b2dfe9
BS		 548 case IP_RECVORIGDSTADDR:
549 if (val)
550 inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR;
551 else
552 inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR;
553 break;
132adf54
SH		 554 case IP_TOS: /* This sets both TOS and Precedence */
555 if (sk->sk_type == SOCK_STREAM) {
556 val &= ~3;
557 val |= inet->tos & 3;
558 }
132adf54
SH		 559 if (inet->tos != val) {
560 inet->tos = val;
561 sk->sk_priority = rt_tos2priority(val);
562 sk_dst_reset(sk);
563 }
564 break;
565 case IP_TTL:
4d52cfbe 566 if (optlen < 1)
132adf54 567 goto e_inval;
4d52cfbe 568 if (val != -1 && (val < 0 || val > 255))
132adf54
SH		 569 goto e_inval;
570 inet->uc_ttl = val;
571 break;
572 case IP_HDRINCL:
573 if (sk->sk_type != SOCK_RAW) {
574 err = -ENOPROTOOPT;
2c7946a7 575 break;
132adf54
SH		 576 }
577 inet->hdrincl = val ? 1 : 0;
578 break;
579 case IP_MTU_DISCOVER:
0eae750e 580 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_PROBE)
132adf54
SH		 581 goto e_inval;
582 inet->pmtudisc = val;
583 break;
584 case IP_RECVERR:
585 inet->recverr = !!val;
586 if (!val)
587 skb_queue_purge(&sk->sk_error_queue);
588 break;
589 case IP_MULTICAST_TTL:
590 if (sk->sk_type == SOCK_STREAM)
591 goto e_inval;
4d52cfbe 592 if (optlen < 1)
132adf54 593 goto e_inval;
09cb105e 594 if (val == -1)
132adf54
SH		 595 val = 1;
596 if (val < 0 || val > 255)
597 goto e_inval;
598 inet->mc_ttl = val;
599 break;
600 case IP_MULTICAST_LOOP:
4d52cfbe 601 if (optlen < 1)
132adf54
SH		 602 goto e_inval;
603 inet->mc_loop = !!val;
604 break;
605 case IP_MULTICAST_IF:
606 {
607 struct ip_mreqn mreq;
608 struct net_device *dev = NULL;
609
610 if (sk->sk_type == SOCK_STREAM)
611 goto e_inval;
612 /*
613 * Check the arguments are allowable
614 */
615
0915921b
SW		 616 if (optlen < sizeof(struct in_addr))
617 goto e_inval;
618
132adf54
SH		 619 err = -EFAULT;
620 if (optlen >= sizeof(struct ip_mreqn)) {
09cb105e 621 if (copy_from_user(&mreq, optval, sizeof(mreq)))
1da177e4 622 break;
132adf54
SH		 623 } else {
624 memset(&mreq, 0, sizeof(mreq));
625 if (optlen >= sizeof(struct in_addr) &&
4d52cfbe
ED		 626 copy_from_user(&mreq.imr_address, optval,
627 sizeof(struct in_addr)))
132adf54
SH		 628 break;
629 }
630
631 if (!mreq.imr_ifindex) {
e6f1cebf 632 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) {
132adf54
SH		 633 inet->mc_index = 0;
634 inet->mc_addr = 0;
635 err = 0;
1da177e4
LT		 636 break;
637 }
3b1e0a65 638 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr);
55b80503 639 if (dev)
132adf54 640 mreq.imr_ifindex = dev->ifindex;
132adf54 641 } else
55b80503 642 dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex);
1da177e4 643
1da177e4 644
132adf54
SH		 645 err = -EADDRNOTAVAIL;
646 if (!dev)
647 break;
55b80503 648 dev_put(dev);
132adf54
SH		 649
650 err = -EINVAL;
651 if (sk->sk_bound_dev_if &&
652 mreq.imr_ifindex != sk->sk_bound_dev_if)
653 break;
1da177e4 654
132adf54
SH		 655 inet->mc_index = mreq.imr_ifindex;
656 inet->mc_addr = mreq.imr_address.s_addr;
657 err = 0;
658 break;
659 }
1da177e4 660
132adf54
SH		 661 case IP_ADD_MEMBERSHIP:
662 case IP_DROP_MEMBERSHIP:
663 {
664 struct ip_mreqn mreq;
1da177e4 665
a96fb49b
FL		 666 err = -EPROTO;
667 if (inet_sk(sk)->is_icsk)
668 break;
669
132adf54
SH		 670 if (optlen < sizeof(struct ip_mreq))
671 goto e_inval;
672 err = -EFAULT;
673 if (optlen >= sizeof(struct ip_mreqn)) {
09cb105e 674 if (copy_from_user(&mreq, optval, sizeof(mreq)))
1da177e4 675 break;
132adf54
SH		 676 } else {
677 memset(&mreq, 0, sizeof(mreq));
09cb105e 678 if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq)))
1da177e4 679 break;
132adf54 680 }
1da177e4 681
132adf54
SH		 682 if (optname == IP_ADD_MEMBERSHIP)
683 err = ip_mc_join_group(sk, &mreq);
684 else
685 err = ip_mc_leave_group(sk, &mreq);
686 break;
687 }
688 case IP_MSFILTER:
689 {
132adf54
SH		 690 struct ip_msfilter *msf;
691
692 if (optlen < IP_MSFILTER_SIZE(0))
693 goto e_inval;
694 if (optlen > sysctl_optmem_max) {
695 err = -ENOBUFS;
1da177e4
LT		 696 break;
697 }
132adf54 698 msf = kmalloc(optlen, GFP_KERNEL);
cfcabdcc 699 if (!msf) {
132adf54
SH		 700 err = -ENOBUFS;
701 break;
702 }
703 err = -EFAULT;
704 if (copy_from_user(msf, optval, optlen)) {
705 kfree(msf);
706 break;
707 }
708 /* numsrc >= (1G-4) overflow in 32 bits */
709 if (msf->imsf_numsrc >= 0x3ffffffcU ||
710 msf->imsf_numsrc > sysctl_igmp_max_msf) {
711 kfree(msf);
712 err = -ENOBUFS;
713 break;
714 }
715 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
716 kfree(msf);
717 err = -EINVAL;
718 break;
719 }
720 err = ip_mc_msfilter(sk, msf, 0);
721 kfree(msf);
722 break;
723 }
724 case IP_BLOCK_SOURCE:
725 case IP_UNBLOCK_SOURCE:
726 case IP_ADD_SOURCE_MEMBERSHIP:
727 case IP_DROP_SOURCE_MEMBERSHIP:
728 {
729 struct ip_mreq_source mreqs;
730 int omode, add;
1da177e4 731
132adf54
SH		 732 if (optlen != sizeof(struct ip_mreq_source))
733 goto e_inval;
734 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
1da177e4 735 err = -EFAULT;
1da177e4
LT		 736 break;
737 }
132adf54
SH		 738 if (optname == IP_BLOCK_SOURCE) {
739 omode = MCAST_EXCLUDE;
740 add = 1;
741 } else if (optname == IP_UNBLOCK_SOURCE) {
742 omode = MCAST_EXCLUDE;
743 add = 0;
744 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
745 struct ip_mreqn mreq;
1da177e4 746
132adf54
SH		 747 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
748 mreq.imr_address.s_addr = mreqs.imr_interface;
749 mreq.imr_ifindex = 0;
750 err = ip_mc_join_group(sk, &mreq);
751 if (err && err != -EADDRINUSE)
1da177e4 752 break;
132adf54
SH		 753 omode = MCAST_INCLUDE;
754 add = 1;
755 } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
756 omode = MCAST_INCLUDE;
757 add = 0;
758 }
759 err = ip_mc_source(add, omode, sk, &mreqs, 0);
760 break;
761 }
762 case MCAST_JOIN_GROUP:
763 case MCAST_LEAVE_GROUP:
764 {
765 struct group_req greq;
766 struct sockaddr_in *psin;
767 struct ip_mreqn mreq;
768
769 if (optlen < sizeof(struct group_req))
770 goto e_inval;
771 err = -EFAULT;
772 if (copy_from_user(&greq, optval, sizeof(greq)))
773 break;
774 psin = (struct sockaddr_in *)&greq.gr_group;
775 if (psin->sin_family != AF_INET)
776 goto e_inval;
777 memset(&mreq, 0, sizeof(mreq));
778 mreq.imr_multiaddr = psin->sin_addr;
779 mreq.imr_ifindex = greq.gr_interface;
780
781 if (optname == MCAST_JOIN_GROUP)
782 err = ip_mc_join_group(sk, &mreq);
783 else
784 err = ip_mc_leave_group(sk, &mreq);
785 break;
786 }
787 case MCAST_JOIN_SOURCE_GROUP:
788 case MCAST_LEAVE_SOURCE_GROUP:
789 case MCAST_BLOCK_SOURCE:
790 case MCAST_UNBLOCK_SOURCE:
791 {
792 struct group_source_req greqs;
793 struct ip_mreq_source mreqs;
794 struct sockaddr_in *psin;
795 int omode, add;
796
797 if (optlen != sizeof(struct group_source_req))
798 goto e_inval;
799 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
1da177e4 800 err = -EFAULT;
1da177e4
LT		 801 break;
802 }
132adf54
SH		 803 if (greqs.gsr_group.ss_family != AF_INET ||
804 greqs.gsr_source.ss_family != AF_INET) {
805 err = -EADDRNOTAVAIL;
1da177e4
LT		 806 break;
807 }
132adf54
SH		 808 psin = (struct sockaddr_in *)&greqs.gsr_group;
809 mreqs.imr_multiaddr = psin->sin_addr.s_addr;
810 psin = (struct sockaddr_in *)&greqs.gsr_source;
811 mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
812 mreqs.imr_interface = 0; /* use index for mc_source */
813
814 if (optname == MCAST_BLOCK_SOURCE) {
815 omode = MCAST_EXCLUDE;
816 add = 1;
817 } else if (optname == MCAST_UNBLOCK_SOURCE) {
818 omode = MCAST_EXCLUDE;
819 add = 0;
820 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
1da177e4
LT		 821 struct ip_mreqn mreq;
822
132adf54 823 psin = (struct sockaddr_in *)&greqs.gsr_group;
1da177e4 824 mreq.imr_multiaddr = psin->sin_addr;
132adf54
SH		 825 mreq.imr_address.s_addr = 0;
826 mreq.imr_ifindex = greqs.gsr_interface;
827 err = ip_mc_join_group(sk, &mreq);
828 if (err && err != -EADDRINUSE)
829 break;
830 greqs.gsr_interface = mreq.imr_ifindex;
831 omode = MCAST_INCLUDE;
832 add = 1;
833 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
834 omode = MCAST_INCLUDE;
835 add = 0;
836 }
837 err = ip_mc_source(add, omode, sk, &mreqs,
838 greqs.gsr_interface);
839 break;
840 }
841 case MCAST_MSFILTER:
842 {
132adf54
SH		 843 struct sockaddr_in *psin;
844 struct ip_msfilter *msf = NULL;
845 struct group_filter *gsf = NULL;
846 int msize, i, ifindex;
847
848 if (optlen < GROUP_FILTER_SIZE(0))
849 goto e_inval;
850 if (optlen > sysctl_optmem_max) {
851 err = -ENOBUFS;
1da177e4
LT		 852 break;
853 }
09cb105e 854 gsf = kmalloc(optlen, GFP_KERNEL);
cfcabdcc 855 if (!gsf) {
132adf54 856 err = -ENOBUFS;
1da177e4
LT		 857 break;
858 }
132adf54 859 err = -EFAULT;
4d52cfbe 860 if (copy_from_user(gsf, optval, optlen))
132adf54 861 goto mc_msf_out;
4d52cfbe 862
132adf54
SH		 863 /* numsrc >= (4G-140)/128 overflow in 32 bits */
864 if (gsf->gf_numsrc >= 0x1ffffff ||
865 gsf->gf_numsrc > sysctl_igmp_max_msf) {
866 err = -ENOBUFS;
867 goto mc_msf_out;
868 }
869 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
870 err = -EINVAL;
871 goto mc_msf_out;
872 }
873 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
09cb105e 874 msf = kmalloc(msize, GFP_KERNEL);
cfcabdcc 875 if (!msf) {
132adf54
SH		 876 err = -ENOBUFS;
877 goto mc_msf_out;
878 }
879 ifindex = gsf->gf_interface;
880 psin = (struct sockaddr_in *)&gsf->gf_group;
881 if (psin->sin_family != AF_INET) {
1da177e4 882 err = -EADDRNOTAVAIL;
132adf54 883 goto mc_msf_out;
1da177e4 884 }
132adf54
SH		 885 msf->imsf_multiaddr = psin->sin_addr.s_addr;
886 msf->imsf_interface = 0;
887 msf->imsf_fmode = gsf->gf_fmode;
888 msf->imsf_numsrc = gsf->gf_numsrc;
889 err = -EADDRNOTAVAIL;
4d52cfbe 890 for (i = 0; i < gsf->gf_numsrc; ++i) {
132adf54 891 psin = (struct sockaddr_in *)&gsf->gf_slist[i];
e905a9ed 892
132adf54
SH		 893 if (psin->sin_family != AF_INET)
894 goto mc_msf_out;
895 msf->imsf_slist[i] = psin->sin_addr.s_addr;
896 }
897 kfree(gsf);
898 gsf = NULL;
899
900 err = ip_mc_msfilter(sk, msf, ifindex);
4d52cfbe 901mc_msf_out:
132adf54
SH		 902 kfree(msf);
903 kfree(gsf);
904 break;
905 }
f771bef9
NS		 906 case IP_MULTICAST_ALL:
907 if (optlen < 1)
908 goto e_inval;
909 if (val != 0 && val != 1)
910 goto e_inval;
911 inet->mc_all = val;
912 break;
132adf54
SH		 913 case IP_ROUTER_ALERT:
914 err = ip_ra_control(sk, val ? 1 : 0, NULL);
915 break;
916
917 case IP_FREEBIND:
4d52cfbe 918 if (optlen < 1)
132adf54
SH		 919 goto e_inval;
920 inet->freebind = !!val;
921 break;
922
923 case IP_IPSEC_POLICY:
924 case IP_XFRM_POLICY:
925 err = -EPERM;
926 if (!capable(CAP_NET_ADMIN))
1da177e4 927 break;
132adf54
SH		 928 err = xfrm_user_policy(sk, optname, optval, optlen);
929 break;
1da177e4 930
f5715aea
KK		 931 case IP_TRANSPARENT:
932 if (!capable(CAP_NET_ADMIN)) {
933 err = -EPERM;
934 break;
935 }
936 if (optlen < 1)
937 goto e_inval;
938 inet->transparent = !!val;
939 break;
940
d218d111
SH		 941 case IP_MINTTL:
942 if (optlen < 1)
943 goto e_inval;
944 if (val < 0 || val > 255)
945 goto e_inval;
946 inet->min_ttl = val;
947 break;
948
132adf54
SH		 949 default:
950 err = -ENOPROTOOPT;
951 break;
1da177e4
LT		 952 }
953 release_sock(sk);
954 return err;
955
956e_inval:
957 release_sock(sk);
958 return -EINVAL;
959}
960
3fdadf7d 961int ip_setsockopt(struct sock *sk, int level,
b7058842 962 int optname, char __user *optval, unsigned int optlen)
3fdadf7d
DM		 963{
964 int err;
965
966 if (level != SOL_IP)
967 return -ENOPROTOOPT;
968
969 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
970#ifdef CONFIG_NETFILTER
971 /* we need to exclude all possible ENOPROTOOPTs except default case */
972 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
6a9fb947
PE		 973 optname != IP_IPSEC_POLICY &&
974 optname != IP_XFRM_POLICY &&
975 !ip_mroute_opt(optname)) {
3fdadf7d
DM		 976 lock_sock(sk);
977 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
978 release_sock(sk);
979 }
980#endif
981 return err;
982}
4d52cfbe 983EXPORT_SYMBOL(ip_setsockopt);
3fdadf7d
DM		 984
985#ifdef CONFIG_COMPAT
543d9cfe 986int compat_ip_setsockopt(struct sock *sk, int level, int optname,
b7058842 987 char __user *optval, unsigned int optlen)
3fdadf7d
DM		 988{
989 int err;
990
991 if (level != SOL_IP)
992 return -ENOPROTOOPT;
993
dae50295
DS		 994 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
995 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
996 ip_setsockopt);
997
3fdadf7d
DM		 998 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
999#ifdef CONFIG_NETFILTER
1000 /* we need to exclude all possible ENOPROTOOPTs except default case */
1001 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
6a9fb947
PE		 1002 optname != IP_IPSEC_POLICY &&
1003 optname != IP_XFRM_POLICY &&
1004 !ip_mroute_opt(optname)) {
3fdadf7d 1005 lock_sock(sk);
543d9cfe
ACM		 1006 err = compat_nf_setsockopt(sk, PF_INET, optname,
1007 optval, optlen);
3fdadf7d
DM		 1008 release_sock(sk);
1009 }
1010#endif
1011 return err;
1012}
543d9cfe 1013EXPORT_SYMBOL(compat_ip_setsockopt);
3fdadf7d
DM		 1014#endif
1015
1da177e4 1016/*
4d52cfbe
ED		 1017 * Get the options. Note for future reference. The GET of IP options gets
1018 * the _received_ ones. The set sets the _sent_ ones.
1da177e4
LT		 1019 */
1020
3fdadf7d 1021static int do_ip_getsockopt(struct sock *sk, int level, int optname,
132adf54 1022 char __user *optval, int __user *optlen)
1da177e4
LT		 1023{
1024 struct inet_sock *inet = inet_sk(sk);
1025 int val;
1026 int len;
e905a9ed 1027
132adf54 1028 if (level != SOL_IP)
1da177e4
LT		 1029 return -EOPNOTSUPP;
1030
6a9fb947 1031 if (ip_mroute_opt(optname))
09cb105e 1032 return ip_mroute_getsockopt(sk, optname, optval, optlen);
1da177e4 1033
09cb105e 1034 if (get_user(len, optlen))
1da177e4 1035 return -EFAULT;
132adf54 1036 if (len < 0)
1da177e4 1037 return -EINVAL;
e905a9ed 1038
1da177e4
LT		 1039 lock_sock(sk);
1040
132adf54
SH		 1041 switch (optname) {
1042 case IP_OPTIONS:
1043 {
1044 unsigned char optbuf[sizeof(struct ip_options)+40];
09cb105e 1045 struct ip_options * opt = (struct ip_options *)optbuf;
132adf54
SH		 1046 opt->optlen = 0;
1047 if (inet->opt)
1048 memcpy(optbuf, inet->opt,
1049 sizeof(struct ip_options)+
1050 inet->opt->optlen);
1051 release_sock(sk);
1052
1053 if (opt->optlen == 0)
1054 return put_user(0, optlen);
1055
1056 ip_options_undo(opt);
1057
1058 len = min_t(unsigned int, len, opt->optlen);
1059 if (put_user(len, optlen))
1060 return -EFAULT;
1061 if (copy_to_user(optval, opt->__data, len))
1062 return -EFAULT;
1063 return 0;
1064 }
1065 case IP_PKTINFO:
1066 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
1067 break;
1068 case IP_RECVTTL:
1069 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
1070 break;
1071 case IP_RECVTOS:
1072 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
1073 break;
1074 case IP_RECVOPTS:
1075 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
1076 break;
1077 case IP_RETOPTS:
1078 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
1079 break;
1080 case IP_PASSSEC:
1081 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
1082 break;
e8b2dfe9
BS		 1083 case IP_RECVORIGDSTADDR:
1084 val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0;
1085 break;
132adf54
SH		 1086 case IP_TOS:
1087 val = inet->tos;
1088 break;
1089 case IP_TTL:
1090 val = (inet->uc_ttl == -1 ?
1091 sysctl_ip_default_ttl :
1092 inet->uc_ttl);
1093 break;
1094 case IP_HDRINCL:
1095 val = inet->hdrincl;
1096 break;
1097 case IP_MTU_DISCOVER:
1098 val = inet->pmtudisc;
1099 break;
1100 case IP_MTU:
1101 {
1102 struct dst_entry *dst;
1103 val = 0;
1104 dst = sk_dst_get(sk);
1105 if (dst) {
1106 val = dst_mtu(dst);
1107 dst_release(dst);
1da177e4 1108 }
132adf54 1109 if (!val) {
1da177e4 1110 release_sock(sk);
132adf54 1111 return -ENOTCONN;
1da177e4 1112 }
132adf54
SH		 1113 break;
1114 }
1115 case IP_RECVERR:
1116 val = inet->recverr;
1117 break;
1118 case IP_MULTICAST_TTL:
1119 val = inet->mc_ttl;
1120 break;
1121 case IP_MULTICAST_LOOP:
1122 val = inet->mc_loop;
1123 break;
1124 case IP_MULTICAST_IF:
1125 {
1126 struct in_addr addr;
1127 len = min_t(unsigned int, len, sizeof(struct in_addr));
1128 addr.s_addr = inet->mc_addr;
1129 release_sock(sk);
1da177e4 1130
132adf54
SH		 1131 if (put_user(len, optlen))
1132 return -EFAULT;
1133 if (copy_to_user(optval, &addr, len))
1134 return -EFAULT;
1135 return 0;
1136 }
1137 case IP_MSFILTER:
1138 {
1139 struct ip_msfilter msf;
1140 int err;
1141
1142 if (len < IP_MSFILTER_SIZE(0)) {
1da177e4 1143 release_sock(sk);
132adf54 1144 return -EINVAL;
1da177e4 1145 }
132adf54 1146 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
1da177e4 1147 release_sock(sk);
132adf54 1148 return -EFAULT;
1da177e4 1149 }
132adf54
SH		 1150 err = ip_mc_msfget(sk, &msf,
1151 (struct ip_msfilter __user *)optval, optlen);
1152 release_sock(sk);
1153 return err;
1154 }
1155 case MCAST_MSFILTER:
1156 {
1157 struct group_filter gsf;
1158 int err;
1da177e4 1159
132adf54 1160 if (len < GROUP_FILTER_SIZE(0)) {
1da177e4 1161 release_sock(sk);
132adf54
SH		 1162 return -EINVAL;
1163 }
1164 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
1165 release_sock(sk);
1166 return -EFAULT;
1167 }
1168 err = ip_mc_gsfget(sk, &gsf,
4d52cfbe
ED		 1169 (struct group_filter __user *)optval,
1170 optlen);
132adf54
SH		 1171 release_sock(sk);
1172 return err;
1173 }
f771bef9
NS		 1174 case IP_MULTICAST_ALL:
1175 val = inet->mc_all;
1176 break;
132adf54
SH		 1177 case IP_PKTOPTIONS:
1178 {
1179 struct msghdr msg;
1da177e4 1180
132adf54 1181 release_sock(sk);
1da177e4 1182
132adf54
SH		 1183 if (sk->sk_type != SOCK_STREAM)
1184 return -ENOPROTOOPT;
1da177e4 1185
132adf54
SH		 1186 msg.msg_control = optval;
1187 msg.msg_controllen = len;
1188 msg.msg_flags = 0;
1da177e4 1189
132adf54
SH		 1190 if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
1191 struct in_pktinfo info;
1192
c720c7e8
ED		 1193 info.ipi_addr.s_addr = inet->inet_rcv_saddr;
1194 info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr;
132adf54
SH		 1195 info.ipi_ifindex = inet->mc_index;
1196 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
1da177e4 1197 }
132adf54
SH		 1198 if (inet->cmsg_flags & IP_CMSG_TTL) {
1199 int hlim = inet->mc_ttl;
1200 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
1201 }
1202 len -= msg.msg_controllen;
1203 return put_user(len, optlen);
1204 }
1205 case IP_FREEBIND:
1206 val = inet->freebind;
1207 break;
f5715aea
KK		 1208 case IP_TRANSPARENT:
1209 val = inet->transparent;
1210 break;
d218d111
SH		 1211 case IP_MINTTL:
1212 val = inet->min_ttl;
1213 break;
132adf54
SH		 1214 default:
1215 release_sock(sk);
1216 return -ENOPROTOOPT;
1da177e4
LT		 1217 }
1218 release_sock(sk);
e905a9ed 1219
4d52cfbe 1220 if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) {
1da177e4
LT		 1221 unsigned char ucval = (unsigned char)val;
1222 len = 1;
132adf54 1223 if (put_user(len, optlen))
1da177e4 1224 return -EFAULT;
09cb105e 1225 if (copy_to_user(optval, &ucval, 1))
1da177e4
LT		 1226 return -EFAULT;
1227 } else {
1228 len = min_t(unsigned int, sizeof(int), len);
132adf54 1229 if (put_user(len, optlen))
1da177e4 1230 return -EFAULT;
09cb105e 1231 if (copy_to_user(optval, &val, len))
1da177e4
LT		 1232 return -EFAULT;
1233 }
1234 return 0;
1235}
1236
3fdadf7d 1237int ip_getsockopt(struct sock *sk, int level,
132adf54 1238 int optname, char __user *optval, int __user *optlen)
3fdadf7d
DM		 1239{
1240 int err;
1241
1242 err = do_ip_getsockopt(sk, level, optname, optval, optlen);
1243#ifdef CONFIG_NETFILTER
1244 /* we need to exclude all possible ENOPROTOOPTs except default case */
6a9fb947
PE		 1245 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1246 !ip_mroute_opt(optname)) {
e905a9ed 1247 int len;
3fdadf7d 1248
09cb105e 1249 if (get_user(len, optlen))
3fdadf7d
DM		 1250 return -EFAULT;
1251
1252 lock_sock(sk);
1253 err = nf_getsockopt(sk, PF_INET, optname, optval,
1254 &len);
1255 release_sock(sk);
1256 if (err >= 0)
1257 err = put_user(len, optlen);
1258 return err;
1259 }
1260#endif
1261 return err;
1262}
4d52cfbe 1263EXPORT_SYMBOL(ip_getsockopt);
3fdadf7d
DM		 1264
1265#ifdef CONFIG_COMPAT
543d9cfe
ACM		 1266int compat_ip_getsockopt(struct sock *sk, int level, int optname,
1267 char __user *optval, int __user *optlen)
3fdadf7d 1268{
42908c69
DS		 1269 int err;
1270
1271 if (optname == MCAST_MSFILTER)
1272 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1273 ip_getsockopt);
1274
1275 err = do_ip_getsockopt(sk, level, optname, optval, optlen);
1276
3fdadf7d
DM		 1277#ifdef CONFIG_NETFILTER
1278 /* we need to exclude all possible ENOPROTOOPTs except default case */
6a9fb947
PE		 1279 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1280 !ip_mroute_opt(optname)) {
e905a9ed 1281 int len;
3fdadf7d 1282
543d9cfe 1283 if (get_user(len, optlen))
3fdadf7d
DM		 1284 return -EFAULT;
1285
1286 lock_sock(sk);
543d9cfe 1287 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
3fdadf7d
DM		 1288 release_sock(sk);
1289 if (err >= 0)
1290 err = put_user(len, optlen);
1291 return err;
1292 }
1293#endif
1294 return err;
1295}
543d9cfe 1296EXPORT_SYMBOL(compat_ip_getsockopt);
3fdadf7d 1297#endif
Linux 6.x block layer and io_uring tree(s)