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ipv4: Implement IP_UNICAST_IF socket option.
[deliverable/linux.git] / net / ipv4 / ip_sockglue.c
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 * Authors: see ip.c
9 *
10 * Fixes:
11 * Many : Split from ip.c , see ip.c for history.
12 * Martin Mares : TOS setting fixed.
13 * Alan Cox : Fixed a couple of oopses in Martin's
14 * TOS tweaks.
15 * Mike McLagan : Routing by source
16 */
17
18 #include <linux/module.h>
19 #include <linux/types.h>
20 #include <linux/mm.h>
21 #include <linux/skbuff.h>
22 #include <linux/ip.h>
23 #include <linux/icmp.h>
24 #include <linux/inetdevice.h>
25 #include <linux/netdevice.h>
26 #include <linux/slab.h>
27 #include <net/sock.h>
28 #include <net/ip.h>
29 #include <net/icmp.h>
30 #include <net/tcp_states.h>
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/inet_ecn.h>
37 #include <net/route.h>
38 #include <net/xfrm.h>
39 #include <net/compat.h>
40 #if IS_ENABLED(CONFIG_IPV6)
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
52 #define IP_CMSG_PASSSEC 32
53 #define IP_CMSG_ORIGDSTADDR 64
54
55 /*
56 * SOL_IP control messages.
57 */
58 #define PKTINFO_SKB_CB(__skb) ((struct in_pktinfo *)((__skb)->cb))
59
60 static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb)
61 {
62 struct in_pktinfo info = *PKTINFO_SKB_CB(skb);
63
64 info.ipi_addr.s_addr = ip_hdr(skb)->daddr;
65
66 put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
67 }
68
69 static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb)
70 {
71 int ttl = ip_hdr(skb)->ttl;
72 put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl);
73 }
74
75 static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb)
76 {
77 put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos);
78 }
79
80 static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb)
81 {
82 if (IPCB(skb)->opt.optlen == 0)
83 return;
84
85 put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen,
86 ip_hdr(skb) + 1);
87 }
88
89
90 static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb)
91 {
92 unsigned char optbuf[sizeof(struct ip_options) + 40];
93 struct ip_options * opt = (struct ip_options *)optbuf;
94
95 if (IPCB(skb)->opt.optlen == 0)
96 return;
97
98 if (ip_options_echo(opt, skb)) {
99 msg->msg_flags |= MSG_CTRUNC;
100 return;
101 }
102 ip_options_undo(opt);
103
104 put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data);
105 }
106
107 static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
108 {
109 char *secdata;
110 u32 seclen, secid;
111 int err;
112
113 err = security_socket_getpeersec_dgram(NULL, skb, &secid);
114 if (err)
115 return;
116
117 err = security_secid_to_secctx(secid, &secdata, &seclen);
118 if (err)
119 return;
120
121 put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata);
122 security_release_secctx(secdata, seclen);
123 }
124
125 static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb)
126 {
127 struct sockaddr_in sin;
128 const struct iphdr *iph = ip_hdr(skb);
129 __be16 *ports = (__be16 *)skb_transport_header(skb);
130
131 if (skb_transport_offset(skb) + 4 > skb->len)
132 return;
133
134 /* All current transport protocols have the port numbers in the
135 * first four bytes of the transport header and this function is
136 * written with this assumption in mind.
137 */
138
139 sin.sin_family = AF_INET;
140 sin.sin_addr.s_addr = iph->daddr;
141 sin.sin_port = ports[1];
142 memset(sin.sin_zero, 0, sizeof(sin.sin_zero));
143
144 put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin);
145 }
146
147 void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
148 {
149 struct inet_sock *inet = inet_sk(skb->sk);
150 unsigned flags = inet->cmsg_flags;
151
152 /* Ordered by supposed usage frequency */
153 if (flags & 1)
154 ip_cmsg_recv_pktinfo(msg, skb);
155 if ((flags >>= 1) == 0)
156 return;
157
158 if (flags & 1)
159 ip_cmsg_recv_ttl(msg, skb);
160 if ((flags >>= 1) == 0)
161 return;
162
163 if (flags & 1)
164 ip_cmsg_recv_tos(msg, skb);
165 if ((flags >>= 1) == 0)
166 return;
167
168 if (flags & 1)
169 ip_cmsg_recv_opts(msg, skb);
170 if ((flags >>= 1) == 0)
171 return;
172
173 if (flags & 1)
174 ip_cmsg_recv_retopts(msg, skb);
175 if ((flags >>= 1) == 0)
176 return;
177
178 if (flags & 1)
179 ip_cmsg_recv_security(msg, skb);
180
181 if ((flags >>= 1) == 0)
182 return;
183 if (flags & 1)
184 ip_cmsg_recv_dstaddr(msg, skb);
185
186 }
187 EXPORT_SYMBOL(ip_cmsg_recv);
188
189 int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc)
190 {
191 int err;
192 struct cmsghdr *cmsg;
193
194 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
195 if (!CMSG_OK(msg, cmsg))
196 return -EINVAL;
197 if (cmsg->cmsg_level != SOL_IP)
198 continue;
199 switch (cmsg->cmsg_type) {
200 case IP_RETOPTS:
201 err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
202 err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg),
203 err < 40 ? err : 40);
204 if (err)
205 return err;
206 break;
207 case IP_PKTINFO:
208 {
209 struct in_pktinfo *info;
210 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
211 return -EINVAL;
212 info = (struct in_pktinfo *)CMSG_DATA(cmsg);
213 ipc->oif = info->ipi_ifindex;
214 ipc->addr = info->ipi_spec_dst.s_addr;
215 break;
216 }
217 default:
218 return -EINVAL;
219 }
220 }
221 return 0;
222 }
223
224
225 /* Special input handler for packets caught by router alert option.
226 They are selected only by protocol field, and then processed likely
227 local ones; but only if someone wants them! Otherwise, router
228 not running rsvpd will kill RSVP.
229
230 It is user level problem, what it will make with them.
231 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
232 but receiver should be enough clever f.e. to forward mtrace requests,
233 sent to multicast group to reach destination designated router.
234 */
235 struct ip_ra_chain __rcu *ip_ra_chain;
236 static DEFINE_SPINLOCK(ip_ra_lock);
237
238
239 static void ip_ra_destroy_rcu(struct rcu_head *head)
240 {
241 struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu);
242
243 sock_put(ra->saved_sk);
244 kfree(ra);
245 }
246
247 int ip_ra_control(struct sock *sk, unsigned char on,
248 void (*destructor)(struct sock *))
249 {
250 struct ip_ra_chain *ra, *new_ra;
251 struct ip_ra_chain __rcu **rap;
252
253 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW)
254 return -EINVAL;
255
256 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
257
258 spin_lock_bh(&ip_ra_lock);
259 for (rap = &ip_ra_chain;
260 (ra = rcu_dereference_protected(*rap,
261 lockdep_is_held(&ip_ra_lock))) != NULL;
262 rap = &ra->next) {
263 if (ra->sk == sk) {
264 if (on) {
265 spin_unlock_bh(&ip_ra_lock);
266 kfree(new_ra);
267 return -EADDRINUSE;
268 }
269 /* dont let ip_call_ra_chain() use sk again */
270 ra->sk = NULL;
271 rcu_assign_pointer(*rap, ra->next);
272 spin_unlock_bh(&ip_ra_lock);
273
274 if (ra->destructor)
275 ra->destructor(sk);
276 /*
277 * Delay sock_put(sk) and kfree(ra) after one rcu grace
278 * period. This guarantee ip_call_ra_chain() dont need
279 * to mess with socket refcounts.
280 */
281 ra->saved_sk = sk;
282 call_rcu(&ra->rcu, ip_ra_destroy_rcu);
283 return 0;
284 }
285 }
286 if (new_ra == NULL) {
287 spin_unlock_bh(&ip_ra_lock);
288 return -ENOBUFS;
289 }
290 new_ra->sk = sk;
291 new_ra->destructor = destructor;
292
293 new_ra->next = ra;
294 rcu_assign_pointer(*rap, new_ra);
295 sock_hold(sk);
296 spin_unlock_bh(&ip_ra_lock);
297
298 return 0;
299 }
300
301 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
302 __be16 port, u32 info, u8 *payload)
303 {
304 struct sock_exterr_skb *serr;
305
306 skb = skb_clone(skb, GFP_ATOMIC);
307 if (!skb)
308 return;
309
310 serr = SKB_EXT_ERR(skb);
311 serr->ee.ee_errno = err;
312 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
313 serr->ee.ee_type = icmp_hdr(skb)->type;
314 serr->ee.ee_code = icmp_hdr(skb)->code;
315 serr->ee.ee_pad = 0;
316 serr->ee.ee_info = info;
317 serr->ee.ee_data = 0;
318 serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) -
319 skb_network_header(skb);
320 serr->port = port;
321
322 if (skb_pull(skb, payload - skb->data) != NULL) {
323 skb_reset_transport_header(skb);
324 if (sock_queue_err_skb(sk, skb) == 0)
325 return;
326 }
327 kfree_skb(skb);
328 }
329
330 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info)
331 {
332 struct inet_sock *inet = inet_sk(sk);
333 struct sock_exterr_skb *serr;
334 struct iphdr *iph;
335 struct sk_buff *skb;
336
337 if (!inet->recverr)
338 return;
339
340 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
341 if (!skb)
342 return;
343
344 skb_put(skb, sizeof(struct iphdr));
345 skb_reset_network_header(skb);
346 iph = ip_hdr(skb);
347 iph->daddr = daddr;
348
349 serr = SKB_EXT_ERR(skb);
350 serr->ee.ee_errno = err;
351 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
352 serr->ee.ee_type = 0;
353 serr->ee.ee_code = 0;
354 serr->ee.ee_pad = 0;
355 serr->ee.ee_info = info;
356 serr->ee.ee_data = 0;
357 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
358 serr->port = port;
359
360 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
361 skb_reset_transport_header(skb);
362
363 if (sock_queue_err_skb(sk, skb))
364 kfree_skb(skb);
365 }
366
367 /*
368 * Handle MSG_ERRQUEUE
369 */
370 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len)
371 {
372 struct sock_exterr_skb *serr;
373 struct sk_buff *skb, *skb2;
374 struct sockaddr_in *sin;
375 struct {
376 struct sock_extended_err ee;
377 struct sockaddr_in offender;
378 } errhdr;
379 int err;
380 int copied;
381
382 err = -EAGAIN;
383 skb = skb_dequeue(&sk->sk_error_queue);
384 if (skb == NULL)
385 goto out;
386
387 copied = skb->len;
388 if (copied > len) {
389 msg->msg_flags |= MSG_TRUNC;
390 copied = len;
391 }
392 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
393 if (err)
394 goto out_free_skb;
395
396 sock_recv_timestamp(msg, sk, skb);
397
398 serr = SKB_EXT_ERR(skb);
399
400 sin = (struct sockaddr_in *)msg->msg_name;
401 if (sin) {
402 sin->sin_family = AF_INET;
403 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) +
404 serr->addr_offset);
405 sin->sin_port = serr->port;
406 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
407 }
408
409 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
410 sin = &errhdr.offender;
411 sin->sin_family = AF_UNSPEC;
412 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) {
413 struct inet_sock *inet = inet_sk(sk);
414
415 sin->sin_family = AF_INET;
416 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
417 sin->sin_port = 0;
418 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
419 if (inet->cmsg_flags)
420 ip_cmsg_recv(msg, skb);
421 }
422
423 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
424
425 /* Now we could try to dump offended packet options */
426
427 msg->msg_flags |= MSG_ERRQUEUE;
428 err = copied;
429
430 /* Reset and regenerate socket error */
431 spin_lock_bh(&sk->sk_error_queue.lock);
432 sk->sk_err = 0;
433 skb2 = skb_peek(&sk->sk_error_queue);
434 if (skb2 != NULL) {
435 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
436 spin_unlock_bh(&sk->sk_error_queue.lock);
437 sk->sk_error_report(sk);
438 } else
439 spin_unlock_bh(&sk->sk_error_queue.lock);
440
441 out_free_skb:
442 kfree_skb(skb);
443 out:
444 return err;
445 }
446
447
448 static void opt_kfree_rcu(struct rcu_head *head)
449 {
450 kfree(container_of(head, struct ip_options_rcu, rcu));
451 }
452
453 /*
454 * Socket option code for IP. This is the end of the line after any
455 * TCP,UDP etc options on an IP socket.
456 */
457
458 static int do_ip_setsockopt(struct sock *sk, int level,
459 int optname, char __user *optval, unsigned int optlen)
460 {
461 struct inet_sock *inet = inet_sk(sk);
462 int val = 0, err;
463
464 if (((1<<optname) & ((1<<IP_PKTINFO) | (1<<IP_RECVTTL) |
465 (1<<IP_RECVOPTS) | (1<<IP_RECVTOS) |
466 (1<<IP_RETOPTS) | (1<<IP_TOS) |
467 (1<<IP_TTL) | (1<<IP_HDRINCL) |
468 (1<<IP_MTU_DISCOVER) | (1<<IP_RECVERR) |
469 (1<<IP_ROUTER_ALERT) | (1<<IP_FREEBIND) |
470 (1<<IP_PASSSEC) | (1<<IP_TRANSPARENT) |
471 (1<<IP_MINTTL) | (1<<IP_NODEFRAG))) ||
472 optname == IP_UNICAST_IF ||
473 optname == IP_MULTICAST_TTL ||
474 optname == IP_MULTICAST_ALL ||
475 optname == IP_MULTICAST_LOOP ||
476 optname == IP_RECVORIGDSTADDR) {
477 if (optlen >= sizeof(int)) {
478 if (get_user(val, (int __user *) optval))
479 return -EFAULT;
480 } else if (optlen >= sizeof(char)) {
481 unsigned char ucval;
482
483 if (get_user(ucval, (unsigned char __user *) optval))
484 return -EFAULT;
485 val = (int) ucval;
486 }
487 }
488
489 /* If optlen==0, it is equivalent to val == 0 */
490
491 if (ip_mroute_opt(optname))
492 return ip_mroute_setsockopt(sk, optname, optval, optlen);
493
494 err = 0;
495 lock_sock(sk);
496
497 switch (optname) {
498 case IP_OPTIONS:
499 {
500 struct ip_options_rcu *old, *opt = NULL;
501
502 if (optlen > 40)
503 goto e_inval;
504 err = ip_options_get_from_user(sock_net(sk), &opt,
505 optval, optlen);
506 if (err)
507 break;
508 old = rcu_dereference_protected(inet->inet_opt,
509 sock_owned_by_user(sk));
510 if (inet->is_icsk) {
511 struct inet_connection_sock *icsk = inet_csk(sk);
512 #if IS_ENABLED(CONFIG_IPV6)
513 if (sk->sk_family == PF_INET ||
514 (!((1 << sk->sk_state) &
515 (TCPF_LISTEN | TCPF_CLOSE)) &&
516 inet->inet_daddr != LOOPBACK4_IPV6)) {
517 #endif
518 if (old)
519 icsk->icsk_ext_hdr_len -= old->opt.optlen;
520 if (opt)
521 icsk->icsk_ext_hdr_len += opt->opt.optlen;
522 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
523 #if IS_ENABLED(CONFIG_IPV6)
524 }
525 #endif
526 }
527 rcu_assign_pointer(inet->inet_opt, opt);
528 if (old)
529 call_rcu(&old->rcu, opt_kfree_rcu);
530 break;
531 }
532 case IP_PKTINFO:
533 if (val)
534 inet->cmsg_flags |= IP_CMSG_PKTINFO;
535 else
536 inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
537 break;
538 case IP_RECVTTL:
539 if (val)
540 inet->cmsg_flags |= IP_CMSG_TTL;
541 else
542 inet->cmsg_flags &= ~IP_CMSG_TTL;
543 break;
544 case IP_RECVTOS:
545 if (val)
546 inet->cmsg_flags |= IP_CMSG_TOS;
547 else
548 inet->cmsg_flags &= ~IP_CMSG_TOS;
549 break;
550 case IP_RECVOPTS:
551 if (val)
552 inet->cmsg_flags |= IP_CMSG_RECVOPTS;
553 else
554 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
555 break;
556 case IP_RETOPTS:
557 if (val)
558 inet->cmsg_flags |= IP_CMSG_RETOPTS;
559 else
560 inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
561 break;
562 case IP_PASSSEC:
563 if (val)
564 inet->cmsg_flags |= IP_CMSG_PASSSEC;
565 else
566 inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
567 break;
568 case IP_RECVORIGDSTADDR:
569 if (val)
570 inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR;
571 else
572 inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR;
573 break;
574 case IP_TOS: /* This sets both TOS and Precedence */
575 if (sk->sk_type == SOCK_STREAM) {
576 val &= ~INET_ECN_MASK;
577 val |= inet->tos & INET_ECN_MASK;
578 }
579 if (inet->tos != val) {
580 inet->tos = val;
581 sk->sk_priority = rt_tos2priority(val);
582 sk_dst_reset(sk);
583 }
584 break;
585 case IP_TTL:
586 if (optlen < 1)
587 goto e_inval;
588 if (val != -1 && (val < 0 || val > 255))
589 goto e_inval;
590 inet->uc_ttl = val;
591 break;
592 case IP_HDRINCL:
593 if (sk->sk_type != SOCK_RAW) {
594 err = -ENOPROTOOPT;
595 break;
596 }
597 inet->hdrincl = val ? 1 : 0;
598 break;
599 case IP_NODEFRAG:
600 if (sk->sk_type != SOCK_RAW) {
601 err = -ENOPROTOOPT;
602 break;
603 }
604 inet->nodefrag = val ? 1 : 0;
605 break;
606 case IP_MTU_DISCOVER:
607 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_PROBE)
608 goto e_inval;
609 inet->pmtudisc = val;
610 break;
611 case IP_RECVERR:
612 inet->recverr = !!val;
613 if (!val)
614 skb_queue_purge(&sk->sk_error_queue);
615 break;
616 case IP_MULTICAST_TTL:
617 if (sk->sk_type == SOCK_STREAM)
618 goto e_inval;
619 if (optlen < 1)
620 goto e_inval;
621 if (val == -1)
622 val = 1;
623 if (val < 0 || val > 255)
624 goto e_inval;
625 inet->mc_ttl = val;
626 break;
627 case IP_MULTICAST_LOOP:
628 if (optlen < 1)
629 goto e_inval;
630 inet->mc_loop = !!val;
631 break;
632 case IP_UNICAST_IF:
633 {
634 struct net_device *dev = NULL;
635 int ifindex;
636
637 if (optlen != sizeof(int))
638 goto e_inval;
639
640 ifindex = (__force int)ntohl((__force __be32)val);
641 if (ifindex == 0) {
642 inet->uc_index = 0;
643 err = 0;
644 break;
645 }
646
647 dev = dev_get_by_index(sock_net(sk), ifindex);
648 err = -EADDRNOTAVAIL;
649 if (!dev)
650 break;
651 dev_put(dev);
652
653 err = -EINVAL;
654 if (sk->sk_bound_dev_if)
655 break;
656
657 inet->uc_index = ifindex;
658 err = 0;
659 break;
660 }
661 case IP_MULTICAST_IF:
662 {
663 struct ip_mreqn mreq;
664 struct net_device *dev = NULL;
665
666 if (sk->sk_type == SOCK_STREAM)
667 goto e_inval;
668 /*
669 * Check the arguments are allowable
670 */
671
672 if (optlen < sizeof(struct in_addr))
673 goto e_inval;
674
675 err = -EFAULT;
676 if (optlen >= sizeof(struct ip_mreqn)) {
677 if (copy_from_user(&mreq, optval, sizeof(mreq)))
678 break;
679 } else {
680 memset(&mreq, 0, sizeof(mreq));
681 if (optlen >= sizeof(struct in_addr) &&
682 copy_from_user(&mreq.imr_address, optval,
683 sizeof(struct in_addr)))
684 break;
685 }
686
687 if (!mreq.imr_ifindex) {
688 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) {
689 inet->mc_index = 0;
690 inet->mc_addr = 0;
691 err = 0;
692 break;
693 }
694 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr);
695 if (dev)
696 mreq.imr_ifindex = dev->ifindex;
697 } else
698 dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex);
699
700
701 err = -EADDRNOTAVAIL;
702 if (!dev)
703 break;
704 dev_put(dev);
705
706 err = -EINVAL;
707 if (sk->sk_bound_dev_if &&
708 mreq.imr_ifindex != sk->sk_bound_dev_if)
709 break;
710
711 inet->mc_index = mreq.imr_ifindex;
712 inet->mc_addr = mreq.imr_address.s_addr;
713 err = 0;
714 break;
715 }
716
717 case IP_ADD_MEMBERSHIP:
718 case IP_DROP_MEMBERSHIP:
719 {
720 struct ip_mreqn mreq;
721
722 err = -EPROTO;
723 if (inet_sk(sk)->is_icsk)
724 break;
725
726 if (optlen < sizeof(struct ip_mreq))
727 goto e_inval;
728 err = -EFAULT;
729 if (optlen >= sizeof(struct ip_mreqn)) {
730 if (copy_from_user(&mreq, optval, sizeof(mreq)))
731 break;
732 } else {
733 memset(&mreq, 0, sizeof(mreq));
734 if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq)))
735 break;
736 }
737
738 if (optname == IP_ADD_MEMBERSHIP)
739 err = ip_mc_join_group(sk, &mreq);
740 else
741 err = ip_mc_leave_group(sk, &mreq);
742 break;
743 }
744 case IP_MSFILTER:
745 {
746 struct ip_msfilter *msf;
747
748 if (optlen < IP_MSFILTER_SIZE(0))
749 goto e_inval;
750 if (optlen > sysctl_optmem_max) {
751 err = -ENOBUFS;
752 break;
753 }
754 msf = kmalloc(optlen, GFP_KERNEL);
755 if (!msf) {
756 err = -ENOBUFS;
757 break;
758 }
759 err = -EFAULT;
760 if (copy_from_user(msf, optval, optlen)) {
761 kfree(msf);
762 break;
763 }
764 /* numsrc >= (1G-4) overflow in 32 bits */
765 if (msf->imsf_numsrc >= 0x3ffffffcU ||
766 msf->imsf_numsrc > sysctl_igmp_max_msf) {
767 kfree(msf);
768 err = -ENOBUFS;
769 break;
770 }
771 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
772 kfree(msf);
773 err = -EINVAL;
774 break;
775 }
776 err = ip_mc_msfilter(sk, msf, 0);
777 kfree(msf);
778 break;
779 }
780 case IP_BLOCK_SOURCE:
781 case IP_UNBLOCK_SOURCE:
782 case IP_ADD_SOURCE_MEMBERSHIP:
783 case IP_DROP_SOURCE_MEMBERSHIP:
784 {
785 struct ip_mreq_source mreqs;
786 int omode, add;
787
788 if (optlen != sizeof(struct ip_mreq_source))
789 goto e_inval;
790 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
791 err = -EFAULT;
792 break;
793 }
794 if (optname == IP_BLOCK_SOURCE) {
795 omode = MCAST_EXCLUDE;
796 add = 1;
797 } else if (optname == IP_UNBLOCK_SOURCE) {
798 omode = MCAST_EXCLUDE;
799 add = 0;
800 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
801 struct ip_mreqn mreq;
802
803 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
804 mreq.imr_address.s_addr = mreqs.imr_interface;
805 mreq.imr_ifindex = 0;
806 err = ip_mc_join_group(sk, &mreq);
807 if (err && err != -EADDRINUSE)
808 break;
809 omode = MCAST_INCLUDE;
810 add = 1;
811 } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
812 omode = MCAST_INCLUDE;
813 add = 0;
814 }
815 err = ip_mc_source(add, omode, sk, &mreqs, 0);
816 break;
817 }
818 case MCAST_JOIN_GROUP:
819 case MCAST_LEAVE_GROUP:
820 {
821 struct group_req greq;
822 struct sockaddr_in *psin;
823 struct ip_mreqn mreq;
824
825 if (optlen < sizeof(struct group_req))
826 goto e_inval;
827 err = -EFAULT;
828 if (copy_from_user(&greq, optval, sizeof(greq)))
829 break;
830 psin = (struct sockaddr_in *)&greq.gr_group;
831 if (psin->sin_family != AF_INET)
832 goto e_inval;
833 memset(&mreq, 0, sizeof(mreq));
834 mreq.imr_multiaddr = psin->sin_addr;
835 mreq.imr_ifindex = greq.gr_interface;
836
837 if (optname == MCAST_JOIN_GROUP)
838 err = ip_mc_join_group(sk, &mreq);
839 else
840 err = ip_mc_leave_group(sk, &mreq);
841 break;
842 }
843 case MCAST_JOIN_SOURCE_GROUP:
844 case MCAST_LEAVE_SOURCE_GROUP:
845 case MCAST_BLOCK_SOURCE:
846 case MCAST_UNBLOCK_SOURCE:
847 {
848 struct group_source_req greqs;
849 struct ip_mreq_source mreqs;
850 struct sockaddr_in *psin;
851 int omode, add;
852
853 if (optlen != sizeof(struct group_source_req))
854 goto e_inval;
855 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
856 err = -EFAULT;
857 break;
858 }
859 if (greqs.gsr_group.ss_family != AF_INET ||
860 greqs.gsr_source.ss_family != AF_INET) {
861 err = -EADDRNOTAVAIL;
862 break;
863 }
864 psin = (struct sockaddr_in *)&greqs.gsr_group;
865 mreqs.imr_multiaddr = psin->sin_addr.s_addr;
866 psin = (struct sockaddr_in *)&greqs.gsr_source;
867 mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
868 mreqs.imr_interface = 0; /* use index for mc_source */
869
870 if (optname == MCAST_BLOCK_SOURCE) {
871 omode = MCAST_EXCLUDE;
872 add = 1;
873 } else if (optname == MCAST_UNBLOCK_SOURCE) {
874 omode = MCAST_EXCLUDE;
875 add = 0;
876 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
877 struct ip_mreqn mreq;
878
879 psin = (struct sockaddr_in *)&greqs.gsr_group;
880 mreq.imr_multiaddr = psin->sin_addr;
881 mreq.imr_address.s_addr = 0;
882 mreq.imr_ifindex = greqs.gsr_interface;
883 err = ip_mc_join_group(sk, &mreq);
884 if (err && err != -EADDRINUSE)
885 break;
886 greqs.gsr_interface = mreq.imr_ifindex;
887 omode = MCAST_INCLUDE;
888 add = 1;
889 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
890 omode = MCAST_INCLUDE;
891 add = 0;
892 }
893 err = ip_mc_source(add, omode, sk, &mreqs,
894 greqs.gsr_interface);
895 break;
896 }
897 case MCAST_MSFILTER:
898 {
899 struct sockaddr_in *psin;
900 struct ip_msfilter *msf = NULL;
901 struct group_filter *gsf = NULL;
902 int msize, i, ifindex;
903
904 if (optlen < GROUP_FILTER_SIZE(0))
905 goto e_inval;
906 if (optlen > sysctl_optmem_max) {
907 err = -ENOBUFS;
908 break;
909 }
910 gsf = kmalloc(optlen, GFP_KERNEL);
911 if (!gsf) {
912 err = -ENOBUFS;
913 break;
914 }
915 err = -EFAULT;
916 if (copy_from_user(gsf, optval, optlen))
917 goto mc_msf_out;
918
919 /* numsrc >= (4G-140)/128 overflow in 32 bits */
920 if (gsf->gf_numsrc >= 0x1ffffff ||
921 gsf->gf_numsrc > sysctl_igmp_max_msf) {
922 err = -ENOBUFS;
923 goto mc_msf_out;
924 }
925 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
926 err = -EINVAL;
927 goto mc_msf_out;
928 }
929 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
930 msf = kmalloc(msize, GFP_KERNEL);
931 if (!msf) {
932 err = -ENOBUFS;
933 goto mc_msf_out;
934 }
935 ifindex = gsf->gf_interface;
936 psin = (struct sockaddr_in *)&gsf->gf_group;
937 if (psin->sin_family != AF_INET) {
938 err = -EADDRNOTAVAIL;
939 goto mc_msf_out;
940 }
941 msf->imsf_multiaddr = psin->sin_addr.s_addr;
942 msf->imsf_interface = 0;
943 msf->imsf_fmode = gsf->gf_fmode;
944 msf->imsf_numsrc = gsf->gf_numsrc;
945 err = -EADDRNOTAVAIL;
946 for (i = 0; i < gsf->gf_numsrc; ++i) {
947 psin = (struct sockaddr_in *)&gsf->gf_slist[i];
948
949 if (psin->sin_family != AF_INET)
950 goto mc_msf_out;
951 msf->imsf_slist[i] = psin->sin_addr.s_addr;
952 }
953 kfree(gsf);
954 gsf = NULL;
955
956 err = ip_mc_msfilter(sk, msf, ifindex);
957 mc_msf_out:
958 kfree(msf);
959 kfree(gsf);
960 break;
961 }
962 case IP_MULTICAST_ALL:
963 if (optlen < 1)
964 goto e_inval;
965 if (val != 0 && val != 1)
966 goto e_inval;
967 inet->mc_all = val;
968 break;
969 case IP_ROUTER_ALERT:
970 err = ip_ra_control(sk, val ? 1 : 0, NULL);
971 break;
972
973 case IP_FREEBIND:
974 if (optlen < 1)
975 goto e_inval;
976 inet->freebind = !!val;
977 break;
978
979 case IP_IPSEC_POLICY:
980 case IP_XFRM_POLICY:
981 err = -EPERM;
982 if (!capable(CAP_NET_ADMIN))
983 break;
984 err = xfrm_user_policy(sk, optname, optval, optlen);
985 break;
986
987 case IP_TRANSPARENT:
988 if (!!val && !capable(CAP_NET_RAW) && !capable(CAP_NET_ADMIN)) {
989 err = -EPERM;
990 break;
991 }
992 if (optlen < 1)
993 goto e_inval;
994 inet->transparent = !!val;
995 break;
996
997 case IP_MINTTL:
998 if (optlen < 1)
999 goto e_inval;
1000 if (val < 0 || val > 255)
1001 goto e_inval;
1002 inet->min_ttl = val;
1003 break;
1004
1005 default:
1006 err = -ENOPROTOOPT;
1007 break;
1008 }
1009 release_sock(sk);
1010 return err;
1011
1012 e_inval:
1013 release_sock(sk);
1014 return -EINVAL;
1015 }
1016
1017 /**
1018 * ipv4_pktinfo_prepare - transfert some info from rtable to skb
1019 * @sk: socket
1020 * @skb: buffer
1021 *
1022 * To support IP_CMSG_PKTINFO option, we store rt_iif and rt_spec_dst
1023 * in skb->cb[] before dst drop.
1024 * This way, receiver doesnt make cache line misses to read rtable.
1025 */
1026 void ipv4_pktinfo_prepare(struct sk_buff *skb)
1027 {
1028 struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb);
1029 const struct rtable *rt = skb_rtable(skb);
1030
1031 if (rt) {
1032 pktinfo->ipi_ifindex = rt->rt_iif;
1033 pktinfo->ipi_spec_dst.s_addr = rt->rt_spec_dst;
1034 } else {
1035 pktinfo->ipi_ifindex = 0;
1036 pktinfo->ipi_spec_dst.s_addr = 0;
1037 }
1038 skb_dst_drop(skb);
1039 }
1040
1041 int ip_setsockopt(struct sock *sk, int level,
1042 int optname, char __user *optval, unsigned int optlen)
1043 {
1044 int err;
1045
1046 if (level != SOL_IP)
1047 return -ENOPROTOOPT;
1048
1049 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1050 #ifdef CONFIG_NETFILTER
1051 /* we need to exclude all possible ENOPROTOOPTs except default case */
1052 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
1053 optname != IP_IPSEC_POLICY &&
1054 optname != IP_XFRM_POLICY &&
1055 !ip_mroute_opt(optname)) {
1056 lock_sock(sk);
1057 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
1058 release_sock(sk);
1059 }
1060 #endif
1061 return err;
1062 }
1063 EXPORT_SYMBOL(ip_setsockopt);
1064
1065 #ifdef CONFIG_COMPAT
1066 int compat_ip_setsockopt(struct sock *sk, int level, int optname,
1067 char __user *optval, unsigned int optlen)
1068 {
1069 int err;
1070
1071 if (level != SOL_IP)
1072 return -ENOPROTOOPT;
1073
1074 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
1075 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
1076 ip_setsockopt);
1077
1078 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1079 #ifdef CONFIG_NETFILTER
1080 /* we need to exclude all possible ENOPROTOOPTs except default case */
1081 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
1082 optname != IP_IPSEC_POLICY &&
1083 optname != IP_XFRM_POLICY &&
1084 !ip_mroute_opt(optname)) {
1085 lock_sock(sk);
1086 err = compat_nf_setsockopt(sk, PF_INET, optname,
1087 optval, optlen);
1088 release_sock(sk);
1089 }
1090 #endif
1091 return err;
1092 }
1093 EXPORT_SYMBOL(compat_ip_setsockopt);
1094 #endif
1095
1096 /*
1097 * Get the options. Note for future reference. The GET of IP options gets
1098 * the _received_ ones. The set sets the _sent_ ones.
1099 */
1100
1101 static int do_ip_getsockopt(struct sock *sk, int level, int optname,
1102 char __user *optval, int __user *optlen, unsigned flags)
1103 {
1104 struct inet_sock *inet = inet_sk(sk);
1105 int val;
1106 int len;
1107
1108 if (level != SOL_IP)
1109 return -EOPNOTSUPP;
1110
1111 if (ip_mroute_opt(optname))
1112 return ip_mroute_getsockopt(sk, optname, optval, optlen);
1113
1114 if (get_user(len, optlen))
1115 return -EFAULT;
1116 if (len < 0)
1117 return -EINVAL;
1118
1119 lock_sock(sk);
1120
1121 switch (optname) {
1122 case IP_OPTIONS:
1123 {
1124 unsigned char optbuf[sizeof(struct ip_options)+40];
1125 struct ip_options *opt = (struct ip_options *)optbuf;
1126 struct ip_options_rcu *inet_opt;
1127
1128 inet_opt = rcu_dereference_protected(inet->inet_opt,
1129 sock_owned_by_user(sk));
1130 opt->optlen = 0;
1131 if (inet_opt)
1132 memcpy(optbuf, &inet_opt->opt,
1133 sizeof(struct ip_options) +
1134 inet_opt->opt.optlen);
1135 release_sock(sk);
1136
1137 if (opt->optlen == 0)
1138 return put_user(0, optlen);
1139
1140 ip_options_undo(opt);
1141
1142 len = min_t(unsigned int, len, opt->optlen);
1143 if (put_user(len, optlen))
1144 return -EFAULT;
1145 if (copy_to_user(optval, opt->__data, len))
1146 return -EFAULT;
1147 return 0;
1148 }
1149 case IP_PKTINFO:
1150 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
1151 break;
1152 case IP_RECVTTL:
1153 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
1154 break;
1155 case IP_RECVTOS:
1156 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
1157 break;
1158 case IP_RECVOPTS:
1159 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
1160 break;
1161 case IP_RETOPTS:
1162 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
1163 break;
1164 case IP_PASSSEC:
1165 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
1166 break;
1167 case IP_RECVORIGDSTADDR:
1168 val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0;
1169 break;
1170 case IP_TOS:
1171 val = inet->tos;
1172 break;
1173 case IP_TTL:
1174 val = (inet->uc_ttl == -1 ?
1175 sysctl_ip_default_ttl :
1176 inet->uc_ttl);
1177 break;
1178 case IP_HDRINCL:
1179 val = inet->hdrincl;
1180 break;
1181 case IP_NODEFRAG:
1182 val = inet->nodefrag;
1183 break;
1184 case IP_MTU_DISCOVER:
1185 val = inet->pmtudisc;
1186 break;
1187 case IP_MTU:
1188 {
1189 struct dst_entry *dst;
1190 val = 0;
1191 dst = sk_dst_get(sk);
1192 if (dst) {
1193 val = dst_mtu(dst);
1194 dst_release(dst);
1195 }
1196 if (!val) {
1197 release_sock(sk);
1198 return -ENOTCONN;
1199 }
1200 break;
1201 }
1202 case IP_RECVERR:
1203 val = inet->recverr;
1204 break;
1205 case IP_MULTICAST_TTL:
1206 val = inet->mc_ttl;
1207 break;
1208 case IP_MULTICAST_LOOP:
1209 val = inet->mc_loop;
1210 break;
1211 case IP_UNICAST_IF:
1212 val = (__force int)htonl((__u32) inet->uc_index);
1213 break;
1214 case IP_MULTICAST_IF:
1215 {
1216 struct in_addr addr;
1217 len = min_t(unsigned int, len, sizeof(struct in_addr));
1218 addr.s_addr = inet->mc_addr;
1219 release_sock(sk);
1220
1221 if (put_user(len, optlen))
1222 return -EFAULT;
1223 if (copy_to_user(optval, &addr, len))
1224 return -EFAULT;
1225 return 0;
1226 }
1227 case IP_MSFILTER:
1228 {
1229 struct ip_msfilter msf;
1230 int err;
1231
1232 if (len < IP_MSFILTER_SIZE(0)) {
1233 release_sock(sk);
1234 return -EINVAL;
1235 }
1236 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
1237 release_sock(sk);
1238 return -EFAULT;
1239 }
1240 err = ip_mc_msfget(sk, &msf,
1241 (struct ip_msfilter __user *)optval, optlen);
1242 release_sock(sk);
1243 return err;
1244 }
1245 case MCAST_MSFILTER:
1246 {
1247 struct group_filter gsf;
1248 int err;
1249
1250 if (len < GROUP_FILTER_SIZE(0)) {
1251 release_sock(sk);
1252 return -EINVAL;
1253 }
1254 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
1255 release_sock(sk);
1256 return -EFAULT;
1257 }
1258 err = ip_mc_gsfget(sk, &gsf,
1259 (struct group_filter __user *)optval,
1260 optlen);
1261 release_sock(sk);
1262 return err;
1263 }
1264 case IP_MULTICAST_ALL:
1265 val = inet->mc_all;
1266 break;
1267 case IP_PKTOPTIONS:
1268 {
1269 struct msghdr msg;
1270
1271 release_sock(sk);
1272
1273 if (sk->sk_type != SOCK_STREAM)
1274 return -ENOPROTOOPT;
1275
1276 msg.msg_control = optval;
1277 msg.msg_controllen = len;
1278 msg.msg_flags = flags;
1279
1280 if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
1281 struct in_pktinfo info;
1282
1283 info.ipi_addr.s_addr = inet->inet_rcv_saddr;
1284 info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr;
1285 info.ipi_ifindex = inet->mc_index;
1286 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
1287 }
1288 if (inet->cmsg_flags & IP_CMSG_TTL) {
1289 int hlim = inet->mc_ttl;
1290 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
1291 }
1292 len -= msg.msg_controllen;
1293 return put_user(len, optlen);
1294 }
1295 case IP_FREEBIND:
1296 val = inet->freebind;
1297 break;
1298 case IP_TRANSPARENT:
1299 val = inet->transparent;
1300 break;
1301 case IP_MINTTL:
1302 val = inet->min_ttl;
1303 break;
1304 default:
1305 release_sock(sk);
1306 return -ENOPROTOOPT;
1307 }
1308 release_sock(sk);
1309
1310 if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) {
1311 unsigned char ucval = (unsigned char)val;
1312 len = 1;
1313 if (put_user(len, optlen))
1314 return -EFAULT;
1315 if (copy_to_user(optval, &ucval, 1))
1316 return -EFAULT;
1317 } else {
1318 len = min_t(unsigned int, sizeof(int), len);
1319 if (put_user(len, optlen))
1320 return -EFAULT;
1321 if (copy_to_user(optval, &val, len))
1322 return -EFAULT;
1323 }
1324 return 0;
1325 }
1326
1327 int ip_getsockopt(struct sock *sk, int level,
1328 int optname, char __user *optval, int __user *optlen)
1329 {
1330 int err;
1331
1332 err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0);
1333 #ifdef CONFIG_NETFILTER
1334 /* we need to exclude all possible ENOPROTOOPTs except default case */
1335 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1336 !ip_mroute_opt(optname)) {
1337 int len;
1338
1339 if (get_user(len, optlen))
1340 return -EFAULT;
1341
1342 lock_sock(sk);
1343 err = nf_getsockopt(sk, PF_INET, optname, optval,
1344 &len);
1345 release_sock(sk);
1346 if (err >= 0)
1347 err = put_user(len, optlen);
1348 return err;
1349 }
1350 #endif
1351 return err;
1352 }
1353 EXPORT_SYMBOL(ip_getsockopt);
1354
1355 #ifdef CONFIG_COMPAT
1356 int compat_ip_getsockopt(struct sock *sk, int level, int optname,
1357 char __user *optval, int __user *optlen)
1358 {
1359 int err;
1360
1361 if (optname == MCAST_MSFILTER)
1362 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1363 ip_getsockopt);
1364
1365 err = do_ip_getsockopt(sk, level, optname, optval, optlen,
1366 MSG_CMSG_COMPAT);
1367
1368 #ifdef CONFIG_NETFILTER
1369 /* we need to exclude all possible ENOPROTOOPTs except default case */
1370 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1371 !ip_mroute_opt(optname)) {
1372 int len;
1373
1374 if (get_user(len, optlen))
1375 return -EFAULT;
1376
1377 lock_sock(sk);
1378 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
1379 release_sock(sk);
1380 if (err >= 0)
1381 err = put_user(len, optlen);
1382 return err;
1383 }
1384 #endif
1385 return err;
1386 }
1387 EXPORT_SYMBOL(compat_ip_getsockopt);
1388 #endif
Linux kernel - Deliverables
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