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[NET]: skb_queue_lock_key() is no longer used.
[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.
7 *
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.
15 * Alan Cox : Fixed a couple of oopses in Martin's
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>
23#include <linux/sched.h>
24#include <linux/skbuff.h>
25#include <linux/ip.h>
26#include <linux/icmp.h>
14c85021 27#include <linux/inetdevice.h>
1da177e4
LT		 28#include <linux/netdevice.h>
29#include <net/sock.h>
30#include <net/ip.h>
31#include <net/icmp.h>
d83d8461 32#include <net/tcp_states.h>
1da177e4
LT		 33#include <linux/udp.h>
34#include <linux/igmp.h>
35#include <linux/netfilter.h>
36#include <linux/route.h>
37#include <linux/mroute.h>
38#include <net/route.h>
39#include <net/xfrm.h>
40#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
41#include <net/transp_v6.h>
42#endif
43
44#include <linux/errqueue.h>
45#include <asm/uaccess.h>
46
47#define IP_CMSG_PKTINFO 1
48#define IP_CMSG_TTL 2
49#define IP_CMSG_TOS 4
50#define IP_CMSG_RECVOPTS 8
51#define IP_CMSG_RETOPTS 16
2c7946a7 52#define IP_CMSG_PASSSEC 32
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;
61 struct rtable *rt = (struct rtable *)skb->dst;
62
63 info.ipi_addr.s_addr = skb->nh.iph->daddr;
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{
77 int ttl = skb->nh.iph->ttl;
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{
83 put_cmsg(msg, SOL_IP, IP_TOS, 1, &skb->nh.iph->tos);
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
91 put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen, skb->nh.iph+1);
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;
115 u32 seclen;
116 int err;
117
118 err = security_socket_getpeersec_dgram(skb, &secdata, &seclen);
119 if (err)
120 return;
121
122 put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata);
123}
124
1da177e4
LT		 125
126void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
127{
128 struct inet_sock *inet = inet_sk(skb->sk);
129 unsigned flags = inet->cmsg_flags;
130
131 /* Ordered by supposed usage frequency */
132 if (flags & 1)
133 ip_cmsg_recv_pktinfo(msg, skb);
134 if ((flags>>=1) == 0)
135 return;
136
137 if (flags & 1)
138 ip_cmsg_recv_ttl(msg, skb);
139 if ((flags>>=1) == 0)
140 return;
141
142 if (flags & 1)
143 ip_cmsg_recv_tos(msg, skb);
144 if ((flags>>=1) == 0)
145 return;
146
147 if (flags & 1)
148 ip_cmsg_recv_opts(msg, skb);
149 if ((flags>>=1) == 0)
150 return;
151
152 if (flags & 1)
153 ip_cmsg_recv_retopts(msg, skb);
2c7946a7
CZ		 154 if ((flags>>=1) == 0)
155 return;
156
157 if (flags & 1)
158 ip_cmsg_recv_security(msg, skb);
1da177e4
LT		 159}
160
161int ip_cmsg_send(struct msghdr *msg, struct ipcm_cookie *ipc)
162{
163 int err;
164 struct cmsghdr *cmsg;
165
166 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
167 if (!CMSG_OK(msg, cmsg))
168 return -EINVAL;
169 if (cmsg->cmsg_level != SOL_IP)
170 continue;
171 switch (cmsg->cmsg_type) {
172 case IP_RETOPTS:
173 err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
4c6ea29d 174 err = ip_options_get(&ipc->opt, CMSG_DATA(cmsg), err < 40 ? err : 40);
1da177e4
LT		 175 if (err)
176 return err;
177 break;
178 case IP_PKTINFO:
179 {
180 struct in_pktinfo *info;
181 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
182 return -EINVAL;
183 info = (struct in_pktinfo *)CMSG_DATA(cmsg);
184 ipc->oif = info->ipi_ifindex;
185 ipc->addr = info->ipi_spec_dst.s_addr;
186 break;
187 }
188 default:
189 return -EINVAL;
190 }
191 }
192 return 0;
193}
194
195
196/* Special input handler for packets caught by router alert option.
197 They are selected only by protocol field, and then processed likely
198 local ones; but only if someone wants them! Otherwise, router
199 not running rsvpd will kill RSVP.
200
201 It is user level problem, what it will make with them.
202 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
203 but receiver should be enough clever f.e. to forward mtrace requests,
204 sent to multicast group to reach destination designated router.
205 */
206struct ip_ra_chain *ip_ra_chain;
207DEFINE_RWLOCK(ip_ra_lock);
208
209int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *))
210{
211 struct ip_ra_chain *ra, *new_ra, **rap;
212
213 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num == IPPROTO_RAW)
214 return -EINVAL;
215
216 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
217
218 write_lock_bh(&ip_ra_lock);
219 for (rap = &ip_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
220 if (ra->sk == sk) {
221 if (on) {
222 write_unlock_bh(&ip_ra_lock);
a51482bd 223 kfree(new_ra);
1da177e4
LT		 224 return -EADDRINUSE;
225 }
226 *rap = ra->next;
227 write_unlock_bh(&ip_ra_lock);
228
229 if (ra->destructor)
230 ra->destructor(sk);
231 sock_put(sk);
232 kfree(ra);
233 return 0;
234 }
235 }
236 if (new_ra == NULL) {
237 write_unlock_bh(&ip_ra_lock);
238 return -ENOBUFS;
239 }
240 new_ra->sk = sk;
241 new_ra->destructor = destructor;
242
243 new_ra->next = ra;
244 *rap = new_ra;
245 sock_hold(sk);
246 write_unlock_bh(&ip_ra_lock);
247
248 return 0;
249}
250
251void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
252 u16 port, u32 info, u8 *payload)
253{
254 struct inet_sock *inet = inet_sk(sk);
255 struct sock_exterr_skb *serr;
256
257 if (!inet->recverr)
258 return;
259
260 skb = skb_clone(skb, GFP_ATOMIC);
261 if (!skb)
262 return;
263
264 serr = SKB_EXT_ERR(skb);
265 serr->ee.ee_errno = err;
266 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
267 serr->ee.ee_type = skb->h.icmph->type;
268 serr->ee.ee_code = skb->h.icmph->code;
269 serr->ee.ee_pad = 0;
270 serr->ee.ee_info = info;
271 serr->ee.ee_data = 0;
272 serr->addr_offset = (u8*)&(((struct iphdr*)(skb->h.icmph+1))->daddr) - skb->nh.raw;
273 serr->port = port;
274
275 skb->h.raw = payload;
276 if (!skb_pull(skb, payload - skb->data) ||
277 sock_queue_err_skb(sk, skb))
278 kfree_skb(skb);
279}
280
281void ip_local_error(struct sock *sk, int err, u32 daddr, u16 port, u32 info)
282{
283 struct inet_sock *inet = inet_sk(sk);
284 struct sock_exterr_skb *serr;
285 struct iphdr *iph;
286 struct sk_buff *skb;
287
288 if (!inet->recverr)
289 return;
290
291 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
292 if (!skb)
293 return;
294
295 iph = (struct iphdr*)skb_put(skb, sizeof(struct iphdr));
296 skb->nh.iph = iph;
297 iph->daddr = daddr;
298
299 serr = SKB_EXT_ERR(skb);
300 serr->ee.ee_errno = err;
301 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
302 serr->ee.ee_type = 0;
303 serr->ee.ee_code = 0;
304 serr->ee.ee_pad = 0;
305 serr->ee.ee_info = info;
306 serr->ee.ee_data = 0;
307 serr->addr_offset = (u8*)&iph->daddr - skb->nh.raw;
308 serr->port = port;
309
310 skb->h.raw = skb->tail;
311 __skb_pull(skb, skb->tail - skb->data);
312
313 if (sock_queue_err_skb(sk, skb))
314 kfree_skb(skb);
315}
316
317/*
318 * Handle MSG_ERRQUEUE
319 */
320int ip_recv_error(struct sock *sk, struct msghdr *msg, int len)
321{
322 struct sock_exterr_skb *serr;
323 struct sk_buff *skb, *skb2;
324 struct sockaddr_in *sin;
325 struct {
326 struct sock_extended_err ee;
327 struct sockaddr_in offender;
328 } errhdr;
329 int err;
330 int copied;
331
332 err = -EAGAIN;
333 skb = skb_dequeue(&sk->sk_error_queue);
334 if (skb == NULL)
335 goto out;
336
337 copied = skb->len;
338 if (copied > len) {
339 msg->msg_flags |= MSG_TRUNC;
340 copied = len;
341 }
342 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
343 if (err)
344 goto out_free_skb;
345
346 sock_recv_timestamp(msg, sk, skb);
347
348 serr = SKB_EXT_ERR(skb);
349
350 sin = (struct sockaddr_in *)msg->msg_name;
351 if (sin) {
352 sin->sin_family = AF_INET;
353 sin->sin_addr.s_addr = *(u32*)(skb->nh.raw + serr->addr_offset);
354 sin->sin_port = serr->port;
355 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
356 }
357
358 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
359 sin = &errhdr.offender;
360 sin->sin_family = AF_UNSPEC;
361 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) {
362 struct inet_sock *inet = inet_sk(sk);
363
364 sin->sin_family = AF_INET;
365 sin->sin_addr.s_addr = skb->nh.iph->saddr;
366 sin->sin_port = 0;
367 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
368 if (inet->cmsg_flags)
369 ip_cmsg_recv(msg, skb);
370 }
371
372 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
373
374 /* Now we could try to dump offended packet options */
375
376 msg->msg_flags |= MSG_ERRQUEUE;
377 err = copied;
378
379 /* Reset and regenerate socket error */
e0f9f858 380 spin_lock_bh(&sk->sk_error_queue.lock);
1da177e4
LT		 381 sk->sk_err = 0;
382 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
383 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
e0f9f858 384 spin_unlock_bh(&sk->sk_error_queue.lock);
1da177e4
LT		 385 sk->sk_error_report(sk);
386 } else
e0f9f858 387 spin_unlock_bh(&sk->sk_error_queue.lock);
1da177e4
LT		 388
389out_free_skb:
390 kfree_skb(skb);
391out:
392 return err;
393}
394
395
396/*
397 * Socket option code for IP. This is the end of the line after any TCP,UDP etc options on
398 * an IP socket.
399 */
400
3fdadf7d
DM		 401static int do_ip_setsockopt(struct sock *sk, int level,
402 int optname, char __user *optval, int optlen)
1da177e4
LT		 403{
404 struct inet_sock *inet = inet_sk(sk);
405 int val=0,err;
406
1da177e4
LT		 407 if (((1<<optname) & ((1<<IP_PKTINFO) | (1<<IP_RECVTTL) |
408 (1<<IP_RECVOPTS) | (1<<IP_RECVTOS) |
409 (1<<IP_RETOPTS) | (1<<IP_TOS) |
410 (1<<IP_TTL) | (1<<IP_HDRINCL) |
411 (1<<IP_MTU_DISCOVER) | (1<<IP_RECVERR) |
2c7946a7
CZ		 412 (1<<IP_ROUTER_ALERT) | (1<<IP_FREEBIND) |
413 (1<<IP_PASSSEC))) ||
1da177e4
LT		 414 optname == IP_MULTICAST_TTL ||
415 optname == IP_MULTICAST_LOOP) {
416 if (optlen >= sizeof(int)) {
417 if (get_user(val, (int __user *) optval))
418 return -EFAULT;
419 } else if (optlen >= sizeof(char)) {
420 unsigned char ucval;
421
422 if (get_user(ucval, (unsigned char __user *) optval))
423 return -EFAULT;
424 val = (int) ucval;
425 }
426 }
427
428 /* If optlen==0, it is equivalent to val == 0 */
429
430#ifdef CONFIG_IP_MROUTE
431 if (optname >= MRT_BASE && optname <= (MRT_BASE + 10))
432 return ip_mroute_setsockopt(sk,optname,optval,optlen);
433#endif
434
435 err = 0;
436 lock_sock(sk);
437
438 switch (optname) {
439 case IP_OPTIONS:
440 {
441 struct ip_options * opt = NULL;
442 if (optlen > 40 || optlen < 0)
443 goto e_inval;
4c6ea29d 444 err = ip_options_get_from_user(&opt, optval, optlen);
1da177e4
LT		 445 if (err)
446 break;
d83d8461
ACM		 447 if (inet->is_icsk) {
448 struct inet_connection_sock *icsk = inet_csk(sk);
1da177e4
LT		 449#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
450 if (sk->sk_family == PF_INET ||
451 (!((1 << sk->sk_state) &
452 (TCPF_LISTEN | TCPF_CLOSE)) &&
453 inet->daddr != LOOPBACK4_IPV6)) {
454#endif
455 if (inet->opt)
d83d8461 456 icsk->icsk_ext_hdr_len -= inet->opt->optlen;
1da177e4 457 if (opt)
d83d8461
ACM		 458 icsk->icsk_ext_hdr_len += opt->optlen;
459 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
1da177e4
LT		 460#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
461 }
462#endif
463 }
464 opt = xchg(&inet->opt, opt);
a51482bd 465 kfree(opt);
1da177e4
LT		 466 break;
467 }
468 case IP_PKTINFO:
469 if (val)
470 inet->cmsg_flags |= IP_CMSG_PKTINFO;
471 else
472 inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
473 break;
474 case IP_RECVTTL:
475 if (val)
476 inet->cmsg_flags |= IP_CMSG_TTL;
477 else
478 inet->cmsg_flags &= ~IP_CMSG_TTL;
479 break;
480 case IP_RECVTOS:
481 if (val)
482 inet->cmsg_flags |= IP_CMSG_TOS;
483 else
484 inet->cmsg_flags &= ~IP_CMSG_TOS;
485 break;
486 case IP_RECVOPTS:
487 if (val)
488 inet->cmsg_flags |= IP_CMSG_RECVOPTS;
489 else
490 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
491 break;
492 case IP_RETOPTS:
493 if (val)
494 inet->cmsg_flags |= IP_CMSG_RETOPTS;
495 else
496 inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
497 break;
2c7946a7
CZ		 498 case IP_PASSSEC:
499 if (val)
500 inet->cmsg_flags |= IP_CMSG_PASSSEC;
501 else
502 inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
503 break;
1da177e4
LT		 504 case IP_TOS: /* This sets both TOS and Precedence */
505 if (sk->sk_type == SOCK_STREAM) {
506 val &= ~3;
507 val |= inet->tos & 3;
508 }
509 if (IPTOS_PREC(val) >= IPTOS_PREC_CRITIC_ECP &&
510 !capable(CAP_NET_ADMIN)) {
511 err = -EPERM;
512 break;
513 }
514 if (inet->tos != val) {
515 inet->tos = val;
516 sk->sk_priority = rt_tos2priority(val);
517 sk_dst_reset(sk);
518 }
519 break;
520 case IP_TTL:
521 if (optlen<1)
522 goto e_inval;
523 if (val != -1 && (val < 1 || val>255))
524 goto e_inval;
525 inet->uc_ttl = val;
526 break;
527 case IP_HDRINCL:
528 if (sk->sk_type != SOCK_RAW) {
529 err = -ENOPROTOOPT;
530 break;
531 }
532 inet->hdrincl = val ? 1 : 0;
533 break;
534 case IP_MTU_DISCOVER:
535 if (val<0 || val>2)
536 goto e_inval;
537 inet->pmtudisc = val;
538 break;
539 case IP_RECVERR:
540 inet->recverr = !!val;
541 if (!val)
542 skb_queue_purge(&sk->sk_error_queue);
543 break;
544 case IP_MULTICAST_TTL:
545 if (sk->sk_type == SOCK_STREAM)
546 goto e_inval;
547 if (optlen<1)
548 goto e_inval;
549 if (val==-1)
550 val = 1;
551 if (val < 0 || val > 255)
552 goto e_inval;
553 inet->mc_ttl = val;
554 break;
555 case IP_MULTICAST_LOOP:
556 if (optlen<1)
557 goto e_inval;
558 inet->mc_loop = !!val;
559 break;
560 case IP_MULTICAST_IF:
561 {
562 struct ip_mreqn mreq;
563 struct net_device *dev = NULL;
564
565 if (sk->sk_type == SOCK_STREAM)
566 goto e_inval;
567 /*
568 * Check the arguments are allowable
569 */
570
571 err = -EFAULT;
572 if (optlen >= sizeof(struct ip_mreqn)) {
573 if (copy_from_user(&mreq,optval,sizeof(mreq)))
574 break;
575 } else {
576 memset(&mreq, 0, sizeof(mreq));
577 if (optlen >= sizeof(struct in_addr) &&
578 copy_from_user(&mreq.imr_address,optval,sizeof(struct in_addr)))
579 break;
580 }
581
582 if (!mreq.imr_ifindex) {
583 if (mreq.imr_address.s_addr == INADDR_ANY) {
584 inet->mc_index = 0;
585 inet->mc_addr = 0;
586 err = 0;
587 break;
588 }
589 dev = ip_dev_find(mreq.imr_address.s_addr);
590 if (dev) {
591 mreq.imr_ifindex = dev->ifindex;
592 dev_put(dev);
593 }
594 } else
595 dev = __dev_get_by_index(mreq.imr_ifindex);
596
597
598 err = -EADDRNOTAVAIL;
599 if (!dev)
600 break;
601
602 err = -EINVAL;
603 if (sk->sk_bound_dev_if &&
604 mreq.imr_ifindex != sk->sk_bound_dev_if)
605 break;
606
607 inet->mc_index = mreq.imr_ifindex;
608 inet->mc_addr = mreq.imr_address.s_addr;
609 err = 0;
610 break;
611 }
612
613 case IP_ADD_MEMBERSHIP:
614 case IP_DROP_MEMBERSHIP:
615 {
616 struct ip_mreqn mreq;
617
618 if (optlen < sizeof(struct ip_mreq))
619 goto e_inval;
620 err = -EFAULT;
621 if (optlen >= sizeof(struct ip_mreqn)) {
622 if(copy_from_user(&mreq,optval,sizeof(mreq)))
623 break;
624 } else {
625 memset(&mreq, 0, sizeof(mreq));
626 if (copy_from_user(&mreq,optval,sizeof(struct ip_mreq)))
627 break;
628 }
629
630 if (optname == IP_ADD_MEMBERSHIP)
631 err = ip_mc_join_group(sk, &mreq);
632 else
633 err = ip_mc_leave_group(sk, &mreq);
634 break;
635 }
636 case IP_MSFILTER:
637 {
1da177e4
LT		 638 extern int sysctl_igmp_max_msf;
639 struct ip_msfilter *msf;
640
641 if (optlen < IP_MSFILTER_SIZE(0))
642 goto e_inval;
643 if (optlen > sysctl_optmem_max) {
644 err = -ENOBUFS;
645 break;
646 }
8b3a7005 647 msf = kmalloc(optlen, GFP_KERNEL);
1da177e4
LT		 648 if (msf == 0) {
649 err = -ENOBUFS;
650 break;
651 }
652 err = -EFAULT;
653 if (copy_from_user(msf, optval, optlen)) {
654 kfree(msf);
655 break;
656 }
657 /* numsrc >= (1G-4) overflow in 32 bits */
658 if (msf->imsf_numsrc >= 0x3ffffffcU ||
659 msf->imsf_numsrc > sysctl_igmp_max_msf) {
660 kfree(msf);
661 err = -ENOBUFS;
662 break;
663 }
664 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
665 kfree(msf);
666 err = -EINVAL;
667 break;
668 }
669 err = ip_mc_msfilter(sk, msf, 0);
670 kfree(msf);
671 break;
672 }
673 case IP_BLOCK_SOURCE:
674 case IP_UNBLOCK_SOURCE:
675 case IP_ADD_SOURCE_MEMBERSHIP:
676 case IP_DROP_SOURCE_MEMBERSHIP:
677 {
678 struct ip_mreq_source mreqs;
679 int omode, add;
680
681 if (optlen != sizeof(struct ip_mreq_source))
682 goto e_inval;
683 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
684 err = -EFAULT;
685 break;
686 }
687 if (optname == IP_BLOCK_SOURCE) {
688 omode = MCAST_EXCLUDE;
689 add = 1;
690 } else if (optname == IP_UNBLOCK_SOURCE) {
691 omode = MCAST_EXCLUDE;
692 add = 0;
693 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
694 struct ip_mreqn mreq;
695
696 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
697 mreq.imr_address.s_addr = mreqs.imr_interface;
698 mreq.imr_ifindex = 0;
699 err = ip_mc_join_group(sk, &mreq);
8cdaaa15 700 if (err && err != -EADDRINUSE)
1da177e4
LT		 701 break;
702 omode = MCAST_INCLUDE;
703 add = 1;
8cdaaa15 704 } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
1da177e4
LT		 705 omode = MCAST_INCLUDE;
706 add = 0;
707 }
708 err = ip_mc_source(add, omode, sk, &mreqs, 0);
709 break;
710 }
711 case MCAST_JOIN_GROUP:
712 case MCAST_LEAVE_GROUP:
713 {
714 struct group_req greq;
715 struct sockaddr_in *psin;
716 struct ip_mreqn mreq;
717
718 if (optlen < sizeof(struct group_req))
719 goto e_inval;
720 err = -EFAULT;
721 if(copy_from_user(&greq, optval, sizeof(greq)))
722 break;
723 psin = (struct sockaddr_in *)&greq.gr_group;
724 if (psin->sin_family != AF_INET)
725 goto e_inval;
726 memset(&mreq, 0, sizeof(mreq));
727 mreq.imr_multiaddr = psin->sin_addr;
728 mreq.imr_ifindex = greq.gr_interface;
729
730 if (optname == MCAST_JOIN_GROUP)
731 err = ip_mc_join_group(sk, &mreq);
732 else
733 err = ip_mc_leave_group(sk, &mreq);
734 break;
735 }
736 case MCAST_JOIN_SOURCE_GROUP:
737 case MCAST_LEAVE_SOURCE_GROUP:
738 case MCAST_BLOCK_SOURCE:
739 case MCAST_UNBLOCK_SOURCE:
740 {
741 struct group_source_req greqs;
742 struct ip_mreq_source mreqs;
743 struct sockaddr_in *psin;
744 int omode, add;
745
746 if (optlen != sizeof(struct group_source_req))
747 goto e_inval;
748 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
749 err = -EFAULT;
750 break;
751 }
752 if (greqs.gsr_group.ss_family != AF_INET ||
753 greqs.gsr_source.ss_family != AF_INET) {
754 err = -EADDRNOTAVAIL;
755 break;
756 }
757 psin = (struct sockaddr_in *)&greqs.gsr_group;
758 mreqs.imr_multiaddr = psin->sin_addr.s_addr;
759 psin = (struct sockaddr_in *)&greqs.gsr_source;
760 mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
761 mreqs.imr_interface = 0; /* use index for mc_source */
762
763 if (optname == MCAST_BLOCK_SOURCE) {
764 omode = MCAST_EXCLUDE;
765 add = 1;
766 } else if (optname == MCAST_UNBLOCK_SOURCE) {
767 omode = MCAST_EXCLUDE;
768 add = 0;
769 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
770 struct ip_mreqn mreq;
771
772 psin = (struct sockaddr_in *)&greqs.gsr_group;
773 mreq.imr_multiaddr = psin->sin_addr;
774 mreq.imr_address.s_addr = 0;
775 mreq.imr_ifindex = greqs.gsr_interface;
776 err = ip_mc_join_group(sk, &mreq);
8cdaaa15 777 if (err && err != -EADDRINUSE)
1da177e4
LT		 778 break;
779 greqs.gsr_interface = mreq.imr_ifindex;
780 omode = MCAST_INCLUDE;
781 add = 1;
782 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
783 omode = MCAST_INCLUDE;
784 add = 0;
785 }
786 err = ip_mc_source(add, omode, sk, &mreqs,
787 greqs.gsr_interface);
788 break;
789 }
790 case MCAST_MSFILTER:
791 {
1da177e4
LT		 792 extern int sysctl_igmp_max_msf;
793 struct sockaddr_in *psin;
794 struct ip_msfilter *msf = NULL;
795 struct group_filter *gsf = NULL;
796 int msize, i, ifindex;
797
798 if (optlen < GROUP_FILTER_SIZE(0))
799 goto e_inval;
800 if (optlen > sysctl_optmem_max) {
801 err = -ENOBUFS;
802 break;
803 }
8b3a7005 804 gsf = kmalloc(optlen,GFP_KERNEL);
1da177e4
LT		 805 if (gsf == 0) {
806 err = -ENOBUFS;
807 break;
808 }
809 err = -EFAULT;
810 if (copy_from_user(gsf, optval, optlen)) {
811 goto mc_msf_out;
812 }
813 /* numsrc >= (4G-140)/128 overflow in 32 bits */
814 if (gsf->gf_numsrc >= 0x1ffffff ||
815 gsf->gf_numsrc > sysctl_igmp_max_msf) {
816 err = -ENOBUFS;
817 goto mc_msf_out;
818 }
819 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
820 err = -EINVAL;
821 goto mc_msf_out;
822 }
823 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
8b3a7005 824 msf = kmalloc(msize,GFP_KERNEL);
1da177e4
LT		 825 if (msf == 0) {
826 err = -ENOBUFS;
827 goto mc_msf_out;
828 }
829 ifindex = gsf->gf_interface;
830 psin = (struct sockaddr_in *)&gsf->gf_group;
831 if (psin->sin_family != AF_INET) {
832 err = -EADDRNOTAVAIL;
833 goto mc_msf_out;
834 }
835 msf->imsf_multiaddr = psin->sin_addr.s_addr;
836 msf->imsf_interface = 0;
837 msf->imsf_fmode = gsf->gf_fmode;
838 msf->imsf_numsrc = gsf->gf_numsrc;
839 err = -EADDRNOTAVAIL;
840 for (i=0; i<gsf->gf_numsrc; ++i) {
841 psin = (struct sockaddr_in *)&gsf->gf_slist[i];
842
843 if (psin->sin_family != AF_INET)
844 goto mc_msf_out;
845 msf->imsf_slist[i] = psin->sin_addr.s_addr;
846 }
847 kfree(gsf);
848 gsf = NULL;
849
850 err = ip_mc_msfilter(sk, msf, ifindex);
851mc_msf_out:
a51482bd
JJ		 852 kfree(msf);
853 kfree(gsf);
1da177e4
LT		 854 break;
855 }
856 case IP_ROUTER_ALERT:
857 err = ip_ra_control(sk, val ? 1 : 0, NULL);
858 break;
859
860 case IP_FREEBIND:
861 if (optlen<1)
862 goto e_inval;
863 inet->freebind = !!val;
864 break;
865
866 case IP_IPSEC_POLICY:
867 case IP_XFRM_POLICY:
6fc0b4a7
HX		 868 err = -EPERM;
869 if (!capable(CAP_NET_ADMIN))
870 break;
1da177e4
LT		 871 err = xfrm_user_policy(sk, optname, optval, optlen);
872 break;
873
874 default:
1da177e4 875 err = -ENOPROTOOPT;
1da177e4
LT		 876 break;
877 }
878 release_sock(sk);
879 return err;
880
881e_inval:
882 release_sock(sk);
883 return -EINVAL;
884}
885
3fdadf7d
DM		 886int ip_setsockopt(struct sock *sk, int level,
887 int optname, char __user *optval, int optlen)
888{
889 int err;
890
891 if (level != SOL_IP)
892 return -ENOPROTOOPT;
893
894 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
895#ifdef CONFIG_NETFILTER
896 /* we need to exclude all possible ENOPROTOOPTs except default case */
897 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
898 optname != IP_IPSEC_POLICY && optname != IP_XFRM_POLICY
899#ifdef CONFIG_IP_MROUTE
900 && (optname < MRT_BASE || optname > (MRT_BASE + 10))
901#endif
902 ) {
903 lock_sock(sk);
904 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
905 release_sock(sk);
906 }
907#endif
908 return err;
909}
910
911#ifdef CONFIG_COMPAT
543d9cfe
ACM		 912int compat_ip_setsockopt(struct sock *sk, int level, int optname,
913 char __user *optval, int optlen)
3fdadf7d
DM		 914{
915 int err;
916
917 if (level != SOL_IP)
918 return -ENOPROTOOPT;
919
920 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
921#ifdef CONFIG_NETFILTER
922 /* we need to exclude all possible ENOPROTOOPTs except default case */
923 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
543d9cfe 924 optname != IP_IPSEC_POLICY && optname != IP_XFRM_POLICY
3fdadf7d 925#ifdef CONFIG_IP_MROUTE
543d9cfe 926 && (optname < MRT_BASE || optname > (MRT_BASE + 10))
3fdadf7d
DM		 927#endif
928 ) {
929 lock_sock(sk);
543d9cfe
ACM		 930 err = compat_nf_setsockopt(sk, PF_INET, optname,
931 optval, optlen);
3fdadf7d
DM		 932 release_sock(sk);
933 }
934#endif
935 return err;
936}
543d9cfe
ACM		 937
938EXPORT_SYMBOL(compat_ip_setsockopt);
3fdadf7d
DM		 939#endif
940
1da177e4
LT		 941/*
942 * Get the options. Note for future reference. The GET of IP options gets the
943 * _received_ ones. The set sets the _sent_ ones.
944 */
945
3fdadf7d
DM		 946static int do_ip_getsockopt(struct sock *sk, int level, int optname,
947 char __user *optval, int __user *optlen)
1da177e4
LT		 948{
949 struct inet_sock *inet = inet_sk(sk);
950 int val;
951 int len;
952
953 if(level!=SOL_IP)
954 return -EOPNOTSUPP;
955
956#ifdef CONFIG_IP_MROUTE
957 if(optname>=MRT_BASE && optname <=MRT_BASE+10)
958 {
959 return ip_mroute_getsockopt(sk,optname,optval,optlen);
960 }
961#endif
962
963 if(get_user(len,optlen))
964 return -EFAULT;
965 if(len < 0)
966 return -EINVAL;
967
968 lock_sock(sk);
969
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;
2c7946a7
CZ		 1009 case IP_PASSSEC:
1010 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
1011 break;
1da177e4
LT		 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);
1034 }
1035 if (!val) {
1036 release_sock(sk);
1037 return -ENOTCONN;
1038 }
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);
1056
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)) {
1069 release_sock(sk);
1070 return -EINVAL;
1071 }
1072 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
1073 release_sock(sk);
1074 return -EFAULT;
1075 }
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;
1085
1086 if (len < GROUP_FILTER_SIZE(0)) {
1087 release_sock(sk);
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;
1102
1103 release_sock(sk);
1104
1105 if (sk->sk_type != SOCK_STREAM)
1106 return -ENOPROTOOPT;
1107
1108 msg.msg_control = optval;
1109 msg.msg_controllen = len;
1110 msg.msg_flags = 0;
1111
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);
1119 }
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:
1da177e4
LT		 1131 release_sock(sk);
1132 return -ENOPROTOOPT;
1da177e4
LT		 1133 }
1134 release_sock(sk);
1135
1136 if (len < sizeof(int) && len > 0 && val>=0 && val<255) {
1137 unsigned char ucval = (unsigned char)val;
1138 len = 1;
1139 if(put_user(len, optlen))
1140 return -EFAULT;
1141 if(copy_to_user(optval,&ucval,1))
1142 return -EFAULT;
1143 } else {
1144 len = min_t(unsigned int, sizeof(int), len);
1145 if(put_user(len, optlen))
1146 return -EFAULT;
1147 if(copy_to_user(optval,&val,len))
1148 return -EFAULT;
1149 }
1150 return 0;
1151}
1152
3fdadf7d
DM		 1153int ip_getsockopt(struct sock *sk, int level,
1154 int optname, char __user *optval, int __user *optlen)
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 */
1161 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS
1162#ifdef CONFIG_IP_MROUTE
1163 && (optname < MRT_BASE || optname > MRT_BASE+10)
1164#endif
1165 ) {
1166 int len;
1167
1168 if(get_user(len,optlen))
1169 return -EFAULT;
1170
1171 lock_sock(sk);
1172 err = nf_getsockopt(sk, PF_INET, optname, optval,
1173 &len);
1174 release_sock(sk);
1175 if (err >= 0)
1176 err = put_user(len, optlen);
1177 return err;
1178 }
1179#endif
1180 return err;
1181}
1182
1183#ifdef CONFIG_COMPAT
543d9cfe
ACM		 1184int compat_ip_getsockopt(struct sock *sk, int level, int optname,
1185 char __user *optval, int __user *optlen)
3fdadf7d 1186{
543d9cfe 1187 int err = do_ip_getsockopt(sk, level, optname, optval, optlen);
3fdadf7d
DM		 1188#ifdef CONFIG_NETFILTER
1189 /* we need to exclude all possible ENOPROTOOPTs except default case */
1190 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS
1191#ifdef CONFIG_IP_MROUTE
543d9cfe 1192 && (optname < MRT_BASE || optname > MRT_BASE+10)
3fdadf7d
DM		 1193#endif
1194 ) {
1195 int len;
1196
543d9cfe 1197 if (get_user(len, optlen))
3fdadf7d
DM		 1198 return -EFAULT;
1199
1200 lock_sock(sk);
543d9cfe 1201 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
3fdadf7d
DM		 1202 release_sock(sk);
1203 if (err >= 0)
1204 err = put_user(len, optlen);
1205 return err;
1206 }
1207#endif
1208 return err;
1209}
543d9cfe
ACM		 1210
1211EXPORT_SYMBOL(compat_ip_getsockopt);
3fdadf7d
DM		 1212#endif
1213
1da177e4
LT		 1214EXPORT_SYMBOL(ip_cmsg_recv);
1215
1da177e4
LT		 1216EXPORT_SYMBOL(ip_getsockopt);
1217EXPORT_SYMBOL(ip_setsockopt);
Linux 6.x block layer and io_uring tree(s)