projects / linux-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
[IPSEC]: Use digest_null directly for auth
[linux-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 * Version: $Id: ip_sockglue.c,v 1.62 2002/02/01 22:01:04 davem Exp $
9 *
10 * Authors: see ip.c
11 *
12 * Fixes:
13 * Many : Split from ip.c , see ip.c for history.
14 * Martin Mares : TOS setting fixed.
e905a9ed 15 * Alan Cox : Fixed a couple of oopses in Martin's
1da177e4
LT		 16 * TOS tweaks.
17 * Mike McLagan : Routing by source
18 */
19
1da177e4
LT		 20#include <linux/module.h>
21#include <linux/types.h>
22#include <linux/mm.h>
1da177e4
LT		 23#include <linux/skbuff.h>
24#include <linux/ip.h>
25#include <linux/icmp.h>
14c85021 26#include <linux/inetdevice.h>
1da177e4
LT		 27#include <linux/netdevice.h>
28#include <net/sock.h>
29#include <net/ip.h>
30#include <net/icmp.h>
d83d8461 31#include <net/tcp_states.h>
1da177e4
LT		 32#include <linux/udp.h>
33#include <linux/igmp.h>
34#include <linux/netfilter.h>
35#include <linux/route.h>
36#include <linux/mroute.h>
37#include <net/route.h>
38#include <net/xfrm.h>
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
1da177e4
LT		 52
53/*
54 * SOL_IP control messages.
55 */
56
57static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb)
58{
59 struct in_pktinfo info;
ee6b9673 60 struct rtable *rt = skb->rtable;
1da177e4 61
eddc9ec5 62 info.ipi_addr.s_addr = ip_hdr(skb)->daddr;
1da177e4
LT		 63 if (rt) {
64 info.ipi_ifindex = rt->rt_iif;
65 info.ipi_spec_dst.s_addr = rt->rt_spec_dst;
66 } else {
67 info.ipi_ifindex = 0;
68 info.ipi_spec_dst.s_addr = 0;
69 }
70
71 put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
72}
73
74static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb)
75{
eddc9ec5 76 int ttl = ip_hdr(skb)->ttl;
1da177e4
LT		 77 put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl);
78}
79
80static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb)
81{
eddc9ec5 82 put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos);
1da177e4
LT		 83}
84
85static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb)
86{
87 if (IPCB(skb)->opt.optlen == 0)
88 return;
89
eddc9ec5
ACM		 90 put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen,
91 ip_hdr(skb) + 1);
1da177e4
LT		 92}
93
94
95static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb)
96{
97 unsigned char optbuf[sizeof(struct ip_options) + 40];
98 struct ip_options * opt = (struct ip_options*)optbuf;
99
100 if (IPCB(skb)->opt.optlen == 0)
101 return;
102
103 if (ip_options_echo(opt, skb)) {
104 msg->msg_flags |= MSG_CTRUNC;
105 return;
106 }
107 ip_options_undo(opt);
108
109 put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data);
110}
111
2c7946a7
CZ		 112static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
113{
114 char *secdata;
dc49c1f9 115 u32 seclen, secid;
2c7946a7
CZ		 116 int err;
117
dc49c1f9
CZ		 118 err = security_socket_getpeersec_dgram(NULL, skb, &secid);
119 if (err)
120 return;
121
122 err = security_secid_to_secctx(secid, &secdata, &seclen);
2c7946a7
CZ		 123 if (err)
124 return;
125
126 put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata);
dc49c1f9 127 security_release_secctx(secdata, seclen);
2c7946a7
CZ		 128}
129
1da177e4
LT		 130
131void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
132{
133 struct inet_sock *inet = inet_sk(skb->sk);
134 unsigned flags = inet->cmsg_flags;
135
136 /* Ordered by supposed usage frequency */
137 if (flags & 1)
138 ip_cmsg_recv_pktinfo(msg, skb);
139 if ((flags>>=1) == 0)
140 return;
141
142 if (flags & 1)
143 ip_cmsg_recv_ttl(msg, skb);
144 if ((flags>>=1) == 0)
145 return;
146
147 if (flags & 1)
148 ip_cmsg_recv_tos(msg, skb);
149 if ((flags>>=1) == 0)
150 return;
151
152 if (flags & 1)
153 ip_cmsg_recv_opts(msg, skb);
154 if ((flags>>=1) == 0)
155 return;
156
157 if (flags & 1)
158 ip_cmsg_recv_retopts(msg, skb);
2c7946a7
CZ		 159 if ((flags>>=1) == 0)
160 return;
161
162 if (flags & 1)
163 ip_cmsg_recv_security(msg, skb);
1da177e4
LT		 164}
165
7a6adb92 166int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc)
1da177e4
LT		 167{
168 int err;
169 struct cmsghdr *cmsg;
170
171 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
172 if (!CMSG_OK(msg, cmsg))
173 return -EINVAL;
174 if (cmsg->cmsg_level != SOL_IP)
175 continue;
176 switch (cmsg->cmsg_type) {
177 case IP_RETOPTS:
178 err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
7a6adb92 179 err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg), err < 40 ? err : 40);
1da177e4
LT		 180 if (err)
181 return err;
182 break;
183 case IP_PKTINFO:
184 {
185 struct in_pktinfo *info;
186 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
187 return -EINVAL;
188 info = (struct in_pktinfo *)CMSG_DATA(cmsg);
189 ipc->oif = info->ipi_ifindex;
190 ipc->addr = info->ipi_spec_dst.s_addr;
191 break;
192 }
193 default:
194 return -EINVAL;
195 }
196 }
197 return 0;
198}
199
200
201/* Special input handler for packets caught by router alert option.
202 They are selected only by protocol field, and then processed likely
203 local ones; but only if someone wants them! Otherwise, router
204 not running rsvpd will kill RSVP.
205
206 It is user level problem, what it will make with them.
207 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
208 but receiver should be enough clever f.e. to forward mtrace requests,
209 sent to multicast group to reach destination designated router.
210 */
211struct ip_ra_chain *ip_ra_chain;
212DEFINE_RWLOCK(ip_ra_lock);
213
214int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *))
215{
216 struct ip_ra_chain *ra, *new_ra, **rap;
217
218 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num == IPPROTO_RAW)
219 return -EINVAL;
220
221 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
222
223 write_lock_bh(&ip_ra_lock);
224 for (rap = &ip_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
225 if (ra->sk == sk) {
226 if (on) {
227 write_unlock_bh(&ip_ra_lock);
a51482bd 228 kfree(new_ra);
1da177e4
LT		 229 return -EADDRINUSE;
230 }
231 *rap = ra->next;
232 write_unlock_bh(&ip_ra_lock);
233
234 if (ra->destructor)
235 ra->destructor(sk);
236 sock_put(sk);
237 kfree(ra);
238 return 0;
239 }
240 }
241 if (new_ra == NULL) {
242 write_unlock_bh(&ip_ra_lock);
243 return -ENOBUFS;
244 }
245 new_ra->sk = sk;
246 new_ra->destructor = destructor;
247
248 new_ra->next = ra;
249 *rap = new_ra;
250 sock_hold(sk);
251 write_unlock_bh(&ip_ra_lock);
252
253 return 0;
254}
255
e905a9ed 256void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
35986b32 257 __be16 port, u32 info, u8 *payload)
1da177e4
LT		 258{
259 struct inet_sock *inet = inet_sk(sk);
260 struct sock_exterr_skb *serr;
261
262 if (!inet->recverr)
263 return;
264
265 skb = skb_clone(skb, GFP_ATOMIC);
266 if (!skb)
267 return;
268
e905a9ed 269 serr = SKB_EXT_ERR(skb);
1da177e4
LT		 270 serr->ee.ee_errno = err;
271 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
88c7664f
ACM		 272 serr->ee.ee_type = icmp_hdr(skb)->type;
273 serr->ee.ee_code = icmp_hdr(skb)->code;
1da177e4
LT		 274 serr->ee.ee_pad = 0;
275 serr->ee.ee_info = info;
276 serr->ee.ee_data = 0;
88c7664f 277 serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) -
d56f90a7 278 skb_network_header(skb);
1da177e4
LT		 279 serr->port = port;
280
bd82393c
ACM		 281 if (skb_pull(skb, payload - skb->data) != NULL) {
282 skb_reset_transport_header(skb);
283 if (sock_queue_err_skb(sk, skb) == 0)
284 return;
285 }
286 kfree_skb(skb);
1da177e4
LT		 287}
288
0579016e 289void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info)
1da177e4
LT		 290{
291 struct inet_sock *inet = inet_sk(sk);
292 struct sock_exterr_skb *serr;
293 struct iphdr *iph;
294 struct sk_buff *skb;
295
296 if (!inet->recverr)
297 return;
298
299 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
300 if (!skb)
301 return;
302
2ca9e6f2
ACM		 303 skb_put(skb, sizeof(struct iphdr));
304 skb_reset_network_header(skb);
eddc9ec5 305 iph = ip_hdr(skb);
1da177e4
LT		 306 iph->daddr = daddr;
307
e905a9ed 308 serr = SKB_EXT_ERR(skb);
1da177e4
LT		 309 serr->ee.ee_errno = err;
310 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
e905a9ed 311 serr->ee.ee_type = 0;
1da177e4
LT		 312 serr->ee.ee_code = 0;
313 serr->ee.ee_pad = 0;
314 serr->ee.ee_info = info;
315 serr->ee.ee_data = 0;
d56f90a7 316 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
1da177e4
LT		 317 serr->port = port;
318
27a884dc 319 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
bd82393c 320 skb_reset_transport_header(skb);
1da177e4
LT		 321
322 if (sock_queue_err_skb(sk, skb))
323 kfree_skb(skb);
324}
325
e905a9ed 326/*
1da177e4
LT		 327 * Handle MSG_ERRQUEUE
328 */
329int ip_recv_error(struct sock *sk, struct msghdr *msg, int len)
330{
331 struct sock_exterr_skb *serr;
332 struct sk_buff *skb, *skb2;
333 struct sockaddr_in *sin;
334 struct {
335 struct sock_extended_err ee;
336 struct sockaddr_in offender;
337 } errhdr;
338 int err;
339 int copied;
340
341 err = -EAGAIN;
342 skb = skb_dequeue(&sk->sk_error_queue);
343 if (skb == NULL)
344 goto out;
345
346 copied = skb->len;
347 if (copied > len) {
348 msg->msg_flags |= MSG_TRUNC;
349 copied = len;
350 }
351 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
352 if (err)
353 goto out_free_skb;
354
355 sock_recv_timestamp(msg, sk, skb);
356
357 serr = SKB_EXT_ERR(skb);
358
359 sin = (struct sockaddr_in *)msg->msg_name;
360 if (sin) {
361 sin->sin_family = AF_INET;
d56f90a7
ACM		 362 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) +
363 serr->addr_offset);
1da177e4
LT		 364 sin->sin_port = serr->port;
365 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
366 }
367
368 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
369 sin = &errhdr.offender;
370 sin->sin_family = AF_UNSPEC;
371 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) {
372 struct inet_sock *inet = inet_sk(sk);
373
374 sin->sin_family = AF_INET;
eddc9ec5 375 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
1da177e4
LT		 376 sin->sin_port = 0;
377 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
378 if (inet->cmsg_flags)
379 ip_cmsg_recv(msg, skb);
380 }
381
382 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
383
384 /* Now we could try to dump offended packet options */
385
386 msg->msg_flags |= MSG_ERRQUEUE;
387 err = copied;
388
389 /* Reset and regenerate socket error */
e0f9f858 390 spin_lock_bh(&sk->sk_error_queue.lock);
1da177e4
LT		 391 sk->sk_err = 0;
392 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
393 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
e0f9f858 394 spin_unlock_bh(&sk->sk_error_queue.lock);
1da177e4
LT		 395 sk->sk_error_report(sk);
396 } else
e0f9f858 397 spin_unlock_bh(&sk->sk_error_queue.lock);
1da177e4 398
e905a9ed 399out_free_skb:
1da177e4
LT		 400 kfree_skb(skb);
401out:
402 return err;
403}
404
405
406/*
407 * Socket option code for IP. This is the end of the line after any TCP,UDP etc options on
408 * an IP socket.
409 */
410
3fdadf7d 411static int do_ip_setsockopt(struct sock *sk, int level,
132adf54 412 int optname, char __user *optval, int optlen)
1da177e4
LT		 413{
414 struct inet_sock *inet = inet_sk(sk);
415 int val=0,err;
416
e905a9ed 417 if (((1<<optname) & ((1<<IP_PKTINFO) | (1<<IP_RECVTTL) |
132adf54
SH		 418 (1<<IP_RECVOPTS) | (1<<IP_RECVTOS) |
419 (1<<IP_RETOPTS) | (1<<IP_TOS) |
420 (1<<IP_TTL) | (1<<IP_HDRINCL) |
421 (1<<IP_MTU_DISCOVER) | (1<<IP_RECVERR) |
422 (1<<IP_ROUTER_ALERT) | (1<<IP_FREEBIND) |
423 (1<<IP_PASSSEC))) ||
424 optname == IP_MULTICAST_TTL ||
425 optname == IP_MULTICAST_LOOP) {
1da177e4
LT		 426 if (optlen >= sizeof(int)) {
427 if (get_user(val, (int __user *) optval))
428 return -EFAULT;
429 } else if (optlen >= sizeof(char)) {
430 unsigned char ucval;
431
432 if (get_user(ucval, (unsigned char __user *) optval))
433 return -EFAULT;
434 val = (int) ucval;
435 }
436 }
437
438 /* If optlen==0, it is equivalent to val == 0 */
439
6a9fb947 440 if (ip_mroute_opt(optname))
1da177e4 441 return ip_mroute_setsockopt(sk,optname,optval,optlen);
1da177e4
LT		 442
443 err = 0;
444 lock_sock(sk);
445
446 switch (optname) {
132adf54
SH		 447 case IP_OPTIONS:
448 {
449 struct ip_options * opt = NULL;
450 if (optlen > 40 || optlen < 0)
451 goto e_inval;
3b1e0a65 452 err = ip_options_get_from_user(sock_net(sk), &opt,
cb84663e 453 optval, optlen);
132adf54
SH		 454 if (err)
455 break;
456 if (inet->is_icsk) {
457 struct inet_connection_sock *icsk = inet_csk(sk);
1da177e4 458#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
132adf54
SH		 459 if (sk->sk_family == PF_INET ||
460 (!((1 << sk->sk_state) &
461 (TCPF_LISTEN | TCPF_CLOSE)) &&
462 inet->daddr != LOOPBACK4_IPV6)) {
1da177e4 463#endif
132adf54
SH		 464 if (inet->opt)
465 icsk->icsk_ext_hdr_len -= inet->opt->optlen;
466 if (opt)
467 icsk->icsk_ext_hdr_len += opt->optlen;
468 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
1da177e4 469#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1da177e4 470 }
132adf54 471#endif
1da177e4 472 }
132adf54
SH		 473 opt = xchg(&inet->opt, opt);
474 kfree(opt);
475 break;
476 }
477 case IP_PKTINFO:
478 if (val)
479 inet->cmsg_flags |= IP_CMSG_PKTINFO;
480 else
481 inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
482 break;
483 case IP_RECVTTL:
484 if (val)
485 inet->cmsg_flags |= IP_CMSG_TTL;
486 else
487 inet->cmsg_flags &= ~IP_CMSG_TTL;
488 break;
489 case IP_RECVTOS:
490 if (val)
491 inet->cmsg_flags |= IP_CMSG_TOS;
492 else
493 inet->cmsg_flags &= ~IP_CMSG_TOS;
494 break;
495 case IP_RECVOPTS:
496 if (val)
497 inet->cmsg_flags |= IP_CMSG_RECVOPTS;
498 else
499 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
500 break;
501 case IP_RETOPTS:
502 if (val)
503 inet->cmsg_flags |= IP_CMSG_RETOPTS;
504 else
505 inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
506 break;
507 case IP_PASSSEC:
508 if (val)
509 inet->cmsg_flags |= IP_CMSG_PASSSEC;
510 else
511 inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
512 break;
513 case IP_TOS: /* This sets both TOS and Precedence */
514 if (sk->sk_type == SOCK_STREAM) {
515 val &= ~3;
516 val |= inet->tos & 3;
517 }
132adf54
SH		 518 if (inet->tos != val) {
519 inet->tos = val;
520 sk->sk_priority = rt_tos2priority(val);
521 sk_dst_reset(sk);
522 }
523 break;
524 case IP_TTL:
525 if (optlen<1)
526 goto e_inval;
527 if (val != -1 && (val < 1 || val>255))
528 goto e_inval;
529 inet->uc_ttl = val;
530 break;
531 case IP_HDRINCL:
532 if (sk->sk_type != SOCK_RAW) {
533 err = -ENOPROTOOPT;
2c7946a7 534 break;
132adf54
SH		 535 }
536 inet->hdrincl = val ? 1 : 0;
537 break;
538 case IP_MTU_DISCOVER:
628a5c56 539 if (val<0 || val>3)
132adf54
SH		 540 goto e_inval;
541 inet->pmtudisc = val;
542 break;
543 case IP_RECVERR:
544 inet->recverr = !!val;
545 if (!val)
546 skb_queue_purge(&sk->sk_error_queue);
547 break;
548 case IP_MULTICAST_TTL:
549 if (sk->sk_type == SOCK_STREAM)
550 goto e_inval;
551 if (optlen<1)
552 goto e_inval;
553 if (val==-1)
554 val = 1;
555 if (val < 0 || val > 255)
556 goto e_inval;
557 inet->mc_ttl = val;
558 break;
559 case IP_MULTICAST_LOOP:
560 if (optlen<1)
561 goto e_inval;
562 inet->mc_loop = !!val;
563 break;
564 case IP_MULTICAST_IF:
565 {
566 struct ip_mreqn mreq;
567 struct net_device *dev = NULL;
568
569 if (sk->sk_type == SOCK_STREAM)
570 goto e_inval;
571 /*
572 * Check the arguments are allowable
573 */
574
575 err = -EFAULT;
576 if (optlen >= sizeof(struct ip_mreqn)) {
577 if (copy_from_user(&mreq,optval,sizeof(mreq)))
1da177e4 578 break;
132adf54
SH		 579 } else {
580 memset(&mreq, 0, sizeof(mreq));
581 if (optlen >= sizeof(struct in_addr) &&
582 copy_from_user(&mreq.imr_address,optval,sizeof(struct in_addr)))
583 break;
584 }
585
586 if (!mreq.imr_ifindex) {
e6f1cebf 587 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) {
132adf54
SH		 588 inet->mc_index = 0;
589 inet->mc_addr = 0;
590 err = 0;
1da177e4
LT		 591 break;
592 }
3b1e0a65 593 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr);
132adf54
SH		 594 if (dev) {
595 mreq.imr_ifindex = dev->ifindex;
596 dev_put(dev);
597 }
598 } else
3b1e0a65 599 dev = __dev_get_by_index(sock_net(sk), mreq.imr_ifindex);
1da177e4 600
1da177e4 601
132adf54
SH		 602 err = -EADDRNOTAVAIL;
603 if (!dev)
604 break;
605
606 err = -EINVAL;
607 if (sk->sk_bound_dev_if &&
608 mreq.imr_ifindex != sk->sk_bound_dev_if)
609 break;
1da177e4 610
132adf54
SH		 611 inet->mc_index = mreq.imr_ifindex;
612 inet->mc_addr = mreq.imr_address.s_addr;
613 err = 0;
614 break;
615 }
1da177e4 616
132adf54
SH		 617 case IP_ADD_MEMBERSHIP:
618 case IP_DROP_MEMBERSHIP:
619 {
620 struct ip_mreqn mreq;
1da177e4 621
a96fb49b
FL		 622 err = -EPROTO;
623 if (inet_sk(sk)->is_icsk)
624 break;
625
132adf54
SH		 626 if (optlen < sizeof(struct ip_mreq))
627 goto e_inval;
628 err = -EFAULT;
629 if (optlen >= sizeof(struct ip_mreqn)) {
630 if (copy_from_user(&mreq,optval,sizeof(mreq)))
1da177e4 631 break;
132adf54
SH		 632 } else {
633 memset(&mreq, 0, sizeof(mreq));
634 if (copy_from_user(&mreq,optval,sizeof(struct ip_mreq)))
1da177e4 635 break;
132adf54 636 }
1da177e4 637
132adf54
SH		 638 if (optname == IP_ADD_MEMBERSHIP)
639 err = ip_mc_join_group(sk, &mreq);
640 else
641 err = ip_mc_leave_group(sk, &mreq);
642 break;
643 }
644 case IP_MSFILTER:
645 {
646 extern int sysctl_igmp_max_msf;
647 struct ip_msfilter *msf;
648
649 if (optlen < IP_MSFILTER_SIZE(0))
650 goto e_inval;
651 if (optlen > sysctl_optmem_max) {
652 err = -ENOBUFS;
1da177e4
LT		 653 break;
654 }
132adf54 655 msf = kmalloc(optlen, GFP_KERNEL);
cfcabdcc 656 if (!msf) {
132adf54
SH		 657 err = -ENOBUFS;
658 break;
659 }
660 err = -EFAULT;
661 if (copy_from_user(msf, optval, optlen)) {
662 kfree(msf);
663 break;
664 }
665 /* numsrc >= (1G-4) overflow in 32 bits */
666 if (msf->imsf_numsrc >= 0x3ffffffcU ||
667 msf->imsf_numsrc > sysctl_igmp_max_msf) {
668 kfree(msf);
669 err = -ENOBUFS;
670 break;
671 }
672 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
673 kfree(msf);
674 err = -EINVAL;
675 break;
676 }
677 err = ip_mc_msfilter(sk, msf, 0);
678 kfree(msf);
679 break;
680 }
681 case IP_BLOCK_SOURCE:
682 case IP_UNBLOCK_SOURCE:
683 case IP_ADD_SOURCE_MEMBERSHIP:
684 case IP_DROP_SOURCE_MEMBERSHIP:
685 {
686 struct ip_mreq_source mreqs;
687 int omode, add;
1da177e4 688
132adf54
SH		 689 if (optlen != sizeof(struct ip_mreq_source))
690 goto e_inval;
691 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
1da177e4 692 err = -EFAULT;
1da177e4
LT		 693 break;
694 }
132adf54
SH		 695 if (optname == IP_BLOCK_SOURCE) {
696 omode = MCAST_EXCLUDE;
697 add = 1;
698 } else if (optname == IP_UNBLOCK_SOURCE) {
699 omode = MCAST_EXCLUDE;
700 add = 0;
701 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
702 struct ip_mreqn mreq;
1da177e4 703
132adf54
SH		 704 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
705 mreq.imr_address.s_addr = mreqs.imr_interface;
706 mreq.imr_ifindex = 0;
707 err = ip_mc_join_group(sk, &mreq);
708 if (err && err != -EADDRINUSE)
1da177e4 709 break;
132adf54
SH		 710 omode = MCAST_INCLUDE;
711 add = 1;
712 } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
713 omode = MCAST_INCLUDE;
714 add = 0;
715 }
716 err = ip_mc_source(add, omode, sk, &mreqs, 0);
717 break;
718 }
719 case MCAST_JOIN_GROUP:
720 case MCAST_LEAVE_GROUP:
721 {
722 struct group_req greq;
723 struct sockaddr_in *psin;
724 struct ip_mreqn mreq;
725
726 if (optlen < sizeof(struct group_req))
727 goto e_inval;
728 err = -EFAULT;
729 if (copy_from_user(&greq, optval, sizeof(greq)))
730 break;
731 psin = (struct sockaddr_in *)&greq.gr_group;
732 if (psin->sin_family != AF_INET)
733 goto e_inval;
734 memset(&mreq, 0, sizeof(mreq));
735 mreq.imr_multiaddr = psin->sin_addr;
736 mreq.imr_ifindex = greq.gr_interface;
737
738 if (optname == MCAST_JOIN_GROUP)
739 err = ip_mc_join_group(sk, &mreq);
740 else
741 err = ip_mc_leave_group(sk, &mreq);
742 break;
743 }
744 case MCAST_JOIN_SOURCE_GROUP:
745 case MCAST_LEAVE_SOURCE_GROUP:
746 case MCAST_BLOCK_SOURCE:
747 case MCAST_UNBLOCK_SOURCE:
748 {
749 struct group_source_req greqs;
750 struct ip_mreq_source mreqs;
751 struct sockaddr_in *psin;
752 int omode, add;
753
754 if (optlen != sizeof(struct group_source_req))
755 goto e_inval;
756 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
1da177e4 757 err = -EFAULT;
1da177e4
LT		 758 break;
759 }
132adf54
SH		 760 if (greqs.gsr_group.ss_family != AF_INET ||
761 greqs.gsr_source.ss_family != AF_INET) {
762 err = -EADDRNOTAVAIL;
1da177e4
LT		 763 break;
764 }
132adf54
SH		 765 psin = (struct sockaddr_in *)&greqs.gsr_group;
766 mreqs.imr_multiaddr = psin->sin_addr.s_addr;
767 psin = (struct sockaddr_in *)&greqs.gsr_source;
768 mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
769 mreqs.imr_interface = 0; /* use index for mc_source */
770
771 if (optname == MCAST_BLOCK_SOURCE) {
772 omode = MCAST_EXCLUDE;
773 add = 1;
774 } else if (optname == MCAST_UNBLOCK_SOURCE) {
775 omode = MCAST_EXCLUDE;
776 add = 0;
777 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
1da177e4
LT		 778 struct ip_mreqn mreq;
779
132adf54 780 psin = (struct sockaddr_in *)&greqs.gsr_group;
1da177e4 781 mreq.imr_multiaddr = psin->sin_addr;
132adf54
SH		 782 mreq.imr_address.s_addr = 0;
783 mreq.imr_ifindex = greqs.gsr_interface;
784 err = ip_mc_join_group(sk, &mreq);
785 if (err && err != -EADDRINUSE)
786 break;
787 greqs.gsr_interface = mreq.imr_ifindex;
788 omode = MCAST_INCLUDE;
789 add = 1;
790 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
791 omode = MCAST_INCLUDE;
792 add = 0;
793 }
794 err = ip_mc_source(add, omode, sk, &mreqs,
795 greqs.gsr_interface);
796 break;
797 }
798 case MCAST_MSFILTER:
799 {
800 extern int sysctl_igmp_max_msf;
801 struct sockaddr_in *psin;
802 struct ip_msfilter *msf = NULL;
803 struct group_filter *gsf = NULL;
804 int msize, i, ifindex;
805
806 if (optlen < GROUP_FILTER_SIZE(0))
807 goto e_inval;
808 if (optlen > sysctl_optmem_max) {
809 err = -ENOBUFS;
1da177e4
LT		 810 break;
811 }
132adf54 812 gsf = kmalloc(optlen,GFP_KERNEL);
cfcabdcc 813 if (!gsf) {
132adf54 814 err = -ENOBUFS;
1da177e4
LT		 815 break;
816 }
132adf54
SH		 817 err = -EFAULT;
818 if (copy_from_user(gsf, optval, optlen)) {
819 goto mc_msf_out;
820 }
821 /* numsrc >= (4G-140)/128 overflow in 32 bits */
822 if (gsf->gf_numsrc >= 0x1ffffff ||
823 gsf->gf_numsrc > sysctl_igmp_max_msf) {
824 err = -ENOBUFS;
825 goto mc_msf_out;
826 }
827 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
828 err = -EINVAL;
829 goto mc_msf_out;
830 }
831 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
832 msf = kmalloc(msize,GFP_KERNEL);
cfcabdcc 833 if (!msf) {
132adf54
SH		 834 err = -ENOBUFS;
835 goto mc_msf_out;
836 }
837 ifindex = gsf->gf_interface;
838 psin = (struct sockaddr_in *)&gsf->gf_group;
839 if (psin->sin_family != AF_INET) {
1da177e4 840 err = -EADDRNOTAVAIL;
132adf54 841 goto mc_msf_out;
1da177e4 842 }
132adf54
SH		 843 msf->imsf_multiaddr = psin->sin_addr.s_addr;
844 msf->imsf_interface = 0;
845 msf->imsf_fmode = gsf->gf_fmode;
846 msf->imsf_numsrc = gsf->gf_numsrc;
847 err = -EADDRNOTAVAIL;
848 for (i=0; i<gsf->gf_numsrc; ++i) {
849 psin = (struct sockaddr_in *)&gsf->gf_slist[i];
e905a9ed 850
132adf54
SH		 851 if (psin->sin_family != AF_INET)
852 goto mc_msf_out;
853 msf->imsf_slist[i] = psin->sin_addr.s_addr;
854 }
855 kfree(gsf);
856 gsf = NULL;
857
858 err = ip_mc_msfilter(sk, msf, ifindex);
859 mc_msf_out:
860 kfree(msf);
861 kfree(gsf);
862 break;
863 }
864 case IP_ROUTER_ALERT:
865 err = ip_ra_control(sk, val ? 1 : 0, NULL);
866 break;
867
868 case IP_FREEBIND:
869 if (optlen<1)
870 goto e_inval;
871 inet->freebind = !!val;
872 break;
873
874 case IP_IPSEC_POLICY:
875 case IP_XFRM_POLICY:
876 err = -EPERM;
877 if (!capable(CAP_NET_ADMIN))
1da177e4 878 break;
132adf54
SH		 879 err = xfrm_user_policy(sk, optname, optval, optlen);
880 break;
1da177e4 881
132adf54
SH		 882 default:
883 err = -ENOPROTOOPT;
884 break;
1da177e4
LT		 885 }
886 release_sock(sk);
887 return err;
888
889e_inval:
890 release_sock(sk);
891 return -EINVAL;
892}
893
3fdadf7d
DM		 894int ip_setsockopt(struct sock *sk, int level,
895 int optname, char __user *optval, int optlen)
896{
897 int err;
898
899 if (level != SOL_IP)
900 return -ENOPROTOOPT;
901
902 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
903#ifdef CONFIG_NETFILTER
904 /* we need to exclude all possible ENOPROTOOPTs except default case */
905 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
6a9fb947
PE		 906 optname != IP_IPSEC_POLICY &&
907 optname != IP_XFRM_POLICY &&
908 !ip_mroute_opt(optname)) {
3fdadf7d
DM		 909 lock_sock(sk);
910 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
911 release_sock(sk);
912 }
913#endif
914 return err;
915}
916
917#ifdef CONFIG_COMPAT
543d9cfe
ACM		 918int compat_ip_setsockopt(struct sock *sk, int level, int optname,
919 char __user *optval, int optlen)
3fdadf7d
DM		 920{
921 int err;
922
923 if (level != SOL_IP)
924 return -ENOPROTOOPT;
925
926 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
927#ifdef CONFIG_NETFILTER
928 /* we need to exclude all possible ENOPROTOOPTs except default case */
929 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
6a9fb947
PE		 930 optname != IP_IPSEC_POLICY &&
931 optname != IP_XFRM_POLICY &&
932 !ip_mroute_opt(optname)) {
3fdadf7d 933 lock_sock(sk);
543d9cfe
ACM		 934 err = compat_nf_setsockopt(sk, PF_INET, optname,
935 optval, optlen);
3fdadf7d
DM		 936 release_sock(sk);
937 }
938#endif
939 return err;
940}
543d9cfe
ACM		 941
942EXPORT_SYMBOL(compat_ip_setsockopt);
3fdadf7d
DM		 943#endif
944
1da177e4
LT		 945/*
946 * Get the options. Note for future reference. The GET of IP options gets the
947 * _received_ ones. The set sets the _sent_ ones.
948 */
949
3fdadf7d 950static int do_ip_getsockopt(struct sock *sk, int level, int optname,
132adf54 951 char __user *optval, int __user *optlen)
1da177e4
LT		 952{
953 struct inet_sock *inet = inet_sk(sk);
954 int val;
955 int len;
e905a9ed 956
132adf54 957 if (level != SOL_IP)
1da177e4
LT		 958 return -EOPNOTSUPP;
959
6a9fb947 960 if (ip_mroute_opt(optname))
1da177e4 961 return ip_mroute_getsockopt(sk,optname,optval,optlen);
1da177e4 962
132adf54 963 if (get_user(len,optlen))
1da177e4 964 return -EFAULT;
132adf54 965 if (len < 0)
1da177e4 966 return -EINVAL;
e905a9ed 967
1da177e4
LT		 968 lock_sock(sk);
969
132adf54
SH		 970 switch (optname) {
971 case IP_OPTIONS:
972 {
973 unsigned char optbuf[sizeof(struct ip_options)+40];
974 struct ip_options * opt = (struct ip_options*)optbuf;
975 opt->optlen = 0;
976 if (inet->opt)
977 memcpy(optbuf, inet->opt,
978 sizeof(struct ip_options)+
979 inet->opt->optlen);
980 release_sock(sk);
981
982 if (opt->optlen == 0)
983 return put_user(0, optlen);
984
985 ip_options_undo(opt);
986
987 len = min_t(unsigned int, len, opt->optlen);
988 if (put_user(len, optlen))
989 return -EFAULT;
990 if (copy_to_user(optval, opt->__data, len))
991 return -EFAULT;
992 return 0;
993 }
994 case IP_PKTINFO:
995 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
996 break;
997 case IP_RECVTTL:
998 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
999 break;
1000 case IP_RECVTOS:
1001 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
1002 break;
1003 case IP_RECVOPTS:
1004 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
1005 break;
1006 case IP_RETOPTS:
1007 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
1008 break;
1009 case IP_PASSSEC:
1010 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
1011 break;
1012 case IP_TOS:
1013 val = inet->tos;
1014 break;
1015 case IP_TTL:
1016 val = (inet->uc_ttl == -1 ?
1017 sysctl_ip_default_ttl :
1018 inet->uc_ttl);
1019 break;
1020 case IP_HDRINCL:
1021 val = inet->hdrincl;
1022 break;
1023 case IP_MTU_DISCOVER:
1024 val = inet->pmtudisc;
1025 break;
1026 case IP_MTU:
1027 {
1028 struct dst_entry *dst;
1029 val = 0;
1030 dst = sk_dst_get(sk);
1031 if (dst) {
1032 val = dst_mtu(dst);
1033 dst_release(dst);
1da177e4 1034 }
132adf54 1035 if (!val) {
1da177e4 1036 release_sock(sk);
132adf54 1037 return -ENOTCONN;
1da177e4 1038 }
132adf54
SH		 1039 break;
1040 }
1041 case IP_RECVERR:
1042 val = inet->recverr;
1043 break;
1044 case IP_MULTICAST_TTL:
1045 val = inet->mc_ttl;
1046 break;
1047 case IP_MULTICAST_LOOP:
1048 val = inet->mc_loop;
1049 break;
1050 case IP_MULTICAST_IF:
1051 {
1052 struct in_addr addr;
1053 len = min_t(unsigned int, len, sizeof(struct in_addr));
1054 addr.s_addr = inet->mc_addr;
1055 release_sock(sk);
1da177e4 1056
132adf54
SH		 1057 if (put_user(len, optlen))
1058 return -EFAULT;
1059 if (copy_to_user(optval, &addr, len))
1060 return -EFAULT;
1061 return 0;
1062 }
1063 case IP_MSFILTER:
1064 {
1065 struct ip_msfilter msf;
1066 int err;
1067
1068 if (len < IP_MSFILTER_SIZE(0)) {
1da177e4 1069 release_sock(sk);
132adf54 1070 return -EINVAL;
1da177e4 1071 }
132adf54 1072 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
1da177e4 1073 release_sock(sk);
132adf54 1074 return -EFAULT;
1da177e4 1075 }
132adf54
SH		 1076 err = ip_mc_msfget(sk, &msf,
1077 (struct ip_msfilter __user *)optval, optlen);
1078 release_sock(sk);
1079 return err;
1080 }
1081 case MCAST_MSFILTER:
1082 {
1083 struct group_filter gsf;
1084 int err;
1da177e4 1085
132adf54 1086 if (len < GROUP_FILTER_SIZE(0)) {
1da177e4 1087 release_sock(sk);
132adf54
SH		 1088 return -EINVAL;
1089 }
1090 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
1091 release_sock(sk);
1092 return -EFAULT;
1093 }
1094 err = ip_mc_gsfget(sk, &gsf,
1095 (struct group_filter __user *)optval, optlen);
1096 release_sock(sk);
1097 return err;
1098 }
1099 case IP_PKTOPTIONS:
1100 {
1101 struct msghdr msg;
1da177e4 1102
132adf54 1103 release_sock(sk);
1da177e4 1104
132adf54
SH		 1105 if (sk->sk_type != SOCK_STREAM)
1106 return -ENOPROTOOPT;
1da177e4 1107
132adf54
SH		 1108 msg.msg_control = optval;
1109 msg.msg_controllen = len;
1110 msg.msg_flags = 0;
1da177e4 1111
132adf54
SH		 1112 if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
1113 struct in_pktinfo info;
1114
1115 info.ipi_addr.s_addr = inet->rcv_saddr;
1116 info.ipi_spec_dst.s_addr = inet->rcv_saddr;
1117 info.ipi_ifindex = inet->mc_index;
1118 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
1da177e4 1119 }
132adf54
SH		 1120 if (inet->cmsg_flags & IP_CMSG_TTL) {
1121 int hlim = inet->mc_ttl;
1122 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
1123 }
1124 len -= msg.msg_controllen;
1125 return put_user(len, optlen);
1126 }
1127 case IP_FREEBIND:
1128 val = inet->freebind;
1129 break;
1130 default:
1131 release_sock(sk);
1132 return -ENOPROTOOPT;
1da177e4
LT		 1133 }
1134 release_sock(sk);
e905a9ed 1135
951e07c9 1136 if (len < sizeof(int) && len > 0 && val>=0 && val<=255) {
1da177e4
LT		 1137 unsigned char ucval = (unsigned char)val;
1138 len = 1;
132adf54 1139 if (put_user(len, optlen))
1da177e4 1140 return -EFAULT;
132adf54 1141 if (copy_to_user(optval,&ucval,1))
1da177e4
LT		 1142 return -EFAULT;
1143 } else {
1144 len = min_t(unsigned int, sizeof(int), len);
132adf54 1145 if (put_user(len, optlen))
1da177e4 1146 return -EFAULT;
132adf54 1147 if (copy_to_user(optval,&val,len))
1da177e4
LT		 1148 return -EFAULT;
1149 }
1150 return 0;
1151}
1152
3fdadf7d 1153int ip_getsockopt(struct sock *sk, int level,
132adf54 1154 int optname, char __user *optval, int __user *optlen)
3fdadf7d
DM		 1155{
1156 int err;
1157
1158 err = do_ip_getsockopt(sk, level, optname, optval, optlen);
1159#ifdef CONFIG_NETFILTER
1160 /* we need to exclude all possible ENOPROTOOPTs except default case */
6a9fb947
PE		 1161 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1162 !ip_mroute_opt(optname)) {
e905a9ed 1163 int len;
3fdadf7d 1164
132adf54 1165 if (get_user(len,optlen))
3fdadf7d
DM		 1166 return -EFAULT;
1167
1168 lock_sock(sk);
1169 err = nf_getsockopt(sk, PF_INET, optname, optval,
1170 &len);
1171 release_sock(sk);
1172 if (err >= 0)
1173 err = put_user(len, optlen);
1174 return err;
1175 }
1176#endif
1177 return err;
1178}
1179
1180#ifdef CONFIG_COMPAT
543d9cfe
ACM		 1181int compat_ip_getsockopt(struct sock *sk, int level, int optname,
1182 char __user *optval, int __user *optlen)
3fdadf7d 1183{
543d9cfe 1184 int err = do_ip_getsockopt(sk, level, optname, optval, optlen);
3fdadf7d
DM		 1185#ifdef CONFIG_NETFILTER
1186 /* we need to exclude all possible ENOPROTOOPTs except default case */
6a9fb947
PE		 1187 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1188 !ip_mroute_opt(optname)) {
e905a9ed 1189 int len;
3fdadf7d 1190
543d9cfe 1191 if (get_user(len, optlen))
3fdadf7d
DM		 1192 return -EFAULT;
1193
1194 lock_sock(sk);
543d9cfe 1195 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
3fdadf7d
DM		 1196 release_sock(sk);
1197 if (err >= 0)
1198 err = put_user(len, optlen);
1199 return err;
1200 }
1201#endif
1202 return err;
1203}
543d9cfe
ACM		 1204
1205EXPORT_SYMBOL(compat_ip_getsockopt);
3fdadf7d
DM		 1206#endif
1207
1da177e4
LT		 1208EXPORT_SYMBOL(ip_cmsg_recv);
1209
1da177e4
LT		 1210EXPORT_SYMBOL(ip_getsockopt);
1211EXPORT_SYMBOL(ip_setsockopt);
Linux 6.x block layer and io_uring tree(s)