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ALSA: usb-audio: Fix an out-of-bound read in create_composite_quirks
[linux/fpc-iii.git] / net / ipv4 / ip_sockglue.c
blob3f8caf7d19b8b7bb47e8c5af6481fbdde6cb4063
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 #include <net/checksum.h>
41 #if IS_ENABLED(CONFIG_IPV6)
42 #include <net/transp_v6.h>
43 #endif
44 #include <net/ip_fib.h>
45
46 #include <linux/errqueue.h>
47 #include <asm/uaccess.h>
48
49 /*
50 * SOL_IP control messages.
51 */
52
53 static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb)
54 {
55 struct in_pktinfo info = *PKTINFO_SKB_CB(skb);
56
57 info.ipi_addr.s_addr = ip_hdr(skb)->daddr;
58
59 put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
60 }
61
62 static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb)
63 {
64 int ttl = ip_hdr(skb)->ttl;
65 put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl);
66 }
67
68 static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb)
69 {
70 put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos);
71 }
72
73 static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb)
74 {
75 if (IPCB(skb)->opt.optlen == 0)
76 return;
77
78 put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen,
79 ip_hdr(skb) + 1);
80 }
81
82
83 static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb)
84 {
85 unsigned char optbuf[sizeof(struct ip_options) + 40];
86 struct ip_options *opt = (struct ip_options *)optbuf;
87
88 if (IPCB(skb)->opt.optlen == 0)
89 return;
90
91 if (ip_options_echo(opt, skb)) {
92 msg->msg_flags |= MSG_CTRUNC;
93 return;
94 }
95 ip_options_undo(opt);
96
97 put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data);
98 }
99
100 static void ip_cmsg_recv_checksum(struct msghdr *msg, struct sk_buff *skb,
101 int tlen, int offset)
102 {
103 __wsum csum = skb->csum;
104
105 if (skb->ip_summed != CHECKSUM_COMPLETE)
106 return;
107
108 if (offset != 0) {
109 int tend_off = skb_transport_offset(skb) + tlen;
110 csum = csum_sub(csum, skb_checksum(skb, tend_off, offset, 0));
111 }
112
113 put_cmsg(msg, SOL_IP, IP_CHECKSUM, sizeof(__wsum), &csum);
114 }
115
116 static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
117 {
118 char *secdata;
119 u32 seclen, secid;
120 int err;
121
122 err = security_socket_getpeersec_dgram(NULL, skb, &secid);
123 if (err)
124 return;
125
126 err = security_secid_to_secctx(secid, &secdata, &seclen);
127 if (err)
128 return;
129
130 put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata);
131 security_release_secctx(secdata, seclen);
132 }
133
134 static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb)
135 {
136 struct sockaddr_in sin;
137 __be16 *ports;
138 int end;
139
140 end = skb_transport_offset(skb) + 4;
141 if (end > 0 && !pskb_may_pull(skb, end))
142 return;
143
144 /* All current transport protocols have the port numbers in the
145 * first four bytes of the transport header and this function is
146 * written with this assumption in mind.
147 */
148 ports = (__be16 *)skb_transport_header(skb);
149
150 sin.sin_family = AF_INET;
151 sin.sin_addr.s_addr = ip_hdr(skb)->daddr;
152 sin.sin_port = ports[1];
153 memset(sin.sin_zero, 0, sizeof(sin.sin_zero));
154
155 put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin);
156 }
157
158 void ip_cmsg_recv_offset(struct msghdr *msg, struct sk_buff *skb,
159 int tlen, int offset)
160 {
161 struct inet_sock *inet = inet_sk(skb->sk);
162 unsigned int flags = inet->cmsg_flags;
163
164 /* Ordered by supposed usage frequency */
165 if (flags & IP_CMSG_PKTINFO) {
166 ip_cmsg_recv_pktinfo(msg, skb);
167
168 flags &= ~IP_CMSG_PKTINFO;
169 if (!flags)
170 return;
171 }
172
173 if (flags & IP_CMSG_TTL) {
174 ip_cmsg_recv_ttl(msg, skb);
175
176 flags &= ~IP_CMSG_TTL;
177 if (!flags)
178 return;
179 }
180
181 if (flags & IP_CMSG_TOS) {
182 ip_cmsg_recv_tos(msg, skb);
183
184 flags &= ~IP_CMSG_TOS;
185 if (!flags)
186 return;
187 }
188
189 if (flags & IP_CMSG_RECVOPTS) {
190 ip_cmsg_recv_opts(msg, skb);
191
192 flags &= ~IP_CMSG_RECVOPTS;
193 if (!flags)
194 return;
195 }
196
197 if (flags & IP_CMSG_RETOPTS) {
198 ip_cmsg_recv_retopts(msg, skb);
199
200 flags &= ~IP_CMSG_RETOPTS;
201 if (!flags)
202 return;
203 }
204
205 if (flags & IP_CMSG_PASSSEC) {
206 ip_cmsg_recv_security(msg, skb);
207
208 flags &= ~IP_CMSG_PASSSEC;
209 if (!flags)
210 return;
211 }
212
213 if (flags & IP_CMSG_ORIGDSTADDR) {
214 ip_cmsg_recv_dstaddr(msg, skb);
215
216 flags &= ~IP_CMSG_ORIGDSTADDR;
217 if (!flags)
218 return;
219 }
220
221 if (flags & IP_CMSG_CHECKSUM)
222 ip_cmsg_recv_checksum(msg, skb, tlen, offset);
223 }
224 EXPORT_SYMBOL(ip_cmsg_recv_offset);
225
226 int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc,
227 bool allow_ipv6)
228 {
229 int err, val;
230 struct cmsghdr *cmsg;
231
232 for_each_cmsghdr(cmsg, msg) {
233 if (!CMSG_OK(msg, cmsg))
234 return -EINVAL;
235 #if IS_ENABLED(CONFIG_IPV6)
236 if (allow_ipv6 &&
237 cmsg->cmsg_level == SOL_IPV6 &&
238 cmsg->cmsg_type == IPV6_PKTINFO) {
239 struct in6_pktinfo *src_info;
240
241 if (cmsg->cmsg_len < CMSG_LEN(sizeof(*src_info)))
242 return -EINVAL;
243 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
244 if (!ipv6_addr_v4mapped(&src_info->ipi6_addr))
245 return -EINVAL;
246 if (src_info->ipi6_ifindex)
247 ipc->oif = src_info->ipi6_ifindex;
248 ipc->addr = src_info->ipi6_addr.s6_addr32[3];
249 continue;
250 }
251 #endif
252 if (cmsg->cmsg_level != SOL_IP)
253 continue;
254 switch (cmsg->cmsg_type) {
255 case IP_RETOPTS:
256 err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
257
258 /* Our caller is responsible for freeing ipc->opt */
259 err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg),
260 err < 40 ? err : 40);
261 if (err)
262 return err;
263 break;
264 case IP_PKTINFO:
265 {
266 struct in_pktinfo *info;
267 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
268 return -EINVAL;
269 info = (struct in_pktinfo *)CMSG_DATA(cmsg);
270 if (info->ipi_ifindex)
271 ipc->oif = info->ipi_ifindex;
272 ipc->addr = info->ipi_spec_dst.s_addr;
273 break;
274 }
275 case IP_TTL:
276 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
277 return -EINVAL;
278 val = *(int *)CMSG_DATA(cmsg);
279 if (val < 1 || val > 255)
280 return -EINVAL;
281 ipc->ttl = val;
282 break;
283 case IP_TOS:
284 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
285 return -EINVAL;
286 val = *(int *)CMSG_DATA(cmsg);
287 if (val < 0 || val > 255)
288 return -EINVAL;
289 ipc->tos = val;
290 ipc->priority = rt_tos2priority(ipc->tos);
291 break;
292
293 default:
294 return -EINVAL;
295 }
296 }
297 return 0;
298 }
299
300
301 /* Special input handler for packets caught by router alert option.
302 They are selected only by protocol field, and then processed likely
303 local ones; but only if someone wants them! Otherwise, router
304 not running rsvpd will kill RSVP.
305
306 It is user level problem, what it will make with them.
307 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
308 but receiver should be enough clever f.e. to forward mtrace requests,
309 sent to multicast group to reach destination designated router.
310 */
311 struct ip_ra_chain __rcu *ip_ra_chain;
312 static DEFINE_SPINLOCK(ip_ra_lock);
313
314
315 static void ip_ra_destroy_rcu(struct rcu_head *head)
316 {
317 struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu);
318
319 sock_put(ra->saved_sk);
320 kfree(ra);
321 }
322
323 int ip_ra_control(struct sock *sk, unsigned char on,
324 void (*destructor)(struct sock *))
325 {
326 struct ip_ra_chain *ra, *new_ra;
327 struct ip_ra_chain __rcu **rap;
328
329 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW)
330 return -EINVAL;
331
332 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
333
334 spin_lock_bh(&ip_ra_lock);
335 for (rap = &ip_ra_chain;
336 (ra = rcu_dereference_protected(*rap,
337 lockdep_is_held(&ip_ra_lock))) != NULL;
338 rap = &ra->next) {
339 if (ra->sk == sk) {
340 if (on) {
341 spin_unlock_bh(&ip_ra_lock);
342 kfree(new_ra);
343 return -EADDRINUSE;
344 }
345 /* dont let ip_call_ra_chain() use sk again */
346 ra->sk = NULL;
347 RCU_INIT_POINTER(*rap, ra->next);
348 spin_unlock_bh(&ip_ra_lock);
349
350 if (ra->destructor)
351 ra->destructor(sk);
352 /*
353 * Delay sock_put(sk) and kfree(ra) after one rcu grace
354 * period. This guarantee ip_call_ra_chain() dont need
355 * to mess with socket refcounts.
356 */
357 ra->saved_sk = sk;
358 call_rcu(&ra->rcu, ip_ra_destroy_rcu);
359 return 0;
360 }
361 }
362 if (!new_ra) {
363 spin_unlock_bh(&ip_ra_lock);
364 return -ENOBUFS;
365 }
366 new_ra->sk = sk;
367 new_ra->destructor = destructor;
368
369 RCU_INIT_POINTER(new_ra->next, ra);
370 rcu_assign_pointer(*rap, new_ra);
371 sock_hold(sk);
372 spin_unlock_bh(&ip_ra_lock);
373
374 return 0;
375 }
376
377 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
378 __be16 port, u32 info, u8 *payload)
379 {
380 struct sock_exterr_skb *serr;
381
382 skb = skb_clone(skb, GFP_ATOMIC);
383 if (!skb)
384 return;
385
386 serr = SKB_EXT_ERR(skb);
387 serr->ee.ee_errno = err;
388 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
389 serr->ee.ee_type = icmp_hdr(skb)->type;
390 serr->ee.ee_code = icmp_hdr(skb)->code;
391 serr->ee.ee_pad = 0;
392 serr->ee.ee_info = info;
393 serr->ee.ee_data = 0;
394 serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) -
395 skb_network_header(skb);
396 serr->port = port;
397
398 if (skb_pull(skb, payload - skb->data)) {
399 skb_reset_transport_header(skb);
400 if (sock_queue_err_skb(sk, skb) == 0)
401 return;
402 }
403 kfree_skb(skb);
404 }
405
406 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info)
407 {
408 struct inet_sock *inet = inet_sk(sk);
409 struct sock_exterr_skb *serr;
410 struct iphdr *iph;
411 struct sk_buff *skb;
412
413 if (!inet->recverr)
414 return;
415
416 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
417 if (!skb)
418 return;
419
420 skb_put(skb, sizeof(struct iphdr));
421 skb_reset_network_header(skb);
422 iph = ip_hdr(skb);
423 iph->daddr = daddr;
424
425 serr = SKB_EXT_ERR(skb);
426 serr->ee.ee_errno = err;
427 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
428 serr->ee.ee_type = 0;
429 serr->ee.ee_code = 0;
430 serr->ee.ee_pad = 0;
431 serr->ee.ee_info = info;
432 serr->ee.ee_data = 0;
433 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
434 serr->port = port;
435
436 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
437 skb_reset_transport_header(skb);
438
439 if (sock_queue_err_skb(sk, skb))
440 kfree_skb(skb);
441 }
442
443 /* For some errors we have valid addr_offset even with zero payload and
444 * zero port. Also, addr_offset should be supported if port is set.
445 */
446 static inline bool ipv4_datagram_support_addr(struct sock_exterr_skb *serr)
447 {
448 return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
449 serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port;
450 }
451
452 /* IPv4 supports cmsg on all imcp errors and some timestamps
453 *
454 * Timestamp code paths do not initialize the fields expected by cmsg:
455 * the PKTINFO fields in skb->cb[]. Fill those in here.
456 */
457 static bool ipv4_datagram_support_cmsg(const struct sock *sk,
458 struct sk_buff *skb,
459 int ee_origin)
460 {
461 struct in_pktinfo *info;
462
463 if (ee_origin == SO_EE_ORIGIN_ICMP)
464 return true;
465
466 if (ee_origin == SO_EE_ORIGIN_LOCAL)
467 return false;
468
469 /* Support IP_PKTINFO on tstamp packets if requested, to correlate
470 * timestamp with egress dev. Not possible for packets without dev
471 * or without payload (SOF_TIMESTAMPING_OPT_TSONLY).
472 */
473 if ((!(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_CMSG)) ||
474 (!skb->dev))
475 return false;
476
477 info = PKTINFO_SKB_CB(skb);
478 info->ipi_spec_dst.s_addr = ip_hdr(skb)->saddr;
479 info->ipi_ifindex = skb->dev->ifindex;
480 return true;
481 }
482
483 /*
484 * Handle MSG_ERRQUEUE
485 */
486 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
487 {
488 struct sock_exterr_skb *serr;
489 struct sk_buff *skb;
490 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name);
491 struct {
492 struct sock_extended_err ee;
493 struct sockaddr_in offender;
494 } errhdr;
495 int err;
496 int copied;
497
498 err = -EAGAIN;
499 skb = sock_dequeue_err_skb(sk);
500 if (!skb)
501 goto out;
502
503 copied = skb->len;
504 if (copied > len) {
505 msg->msg_flags |= MSG_TRUNC;
506 copied = len;
507 }
508 err = skb_copy_datagram_msg(skb, 0, msg, copied);
509 if (err)
510 goto out_free_skb;
511
512 sock_recv_timestamp(msg, sk, skb);
513
514 serr = SKB_EXT_ERR(skb);
515
516 if (sin && ipv4_datagram_support_addr(serr)) {
517 sin->sin_family = AF_INET;
518 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) +
519 serr->addr_offset);
520 sin->sin_port = serr->port;
521 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
522 *addr_len = sizeof(*sin);
523 }
524
525 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
526 sin = &errhdr.offender;
527 memset(sin, 0, sizeof(*sin));
528
529 if (ipv4_datagram_support_cmsg(sk, skb, serr->ee.ee_origin)) {
530 sin->sin_family = AF_INET;
531 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
532 if (inet_sk(sk)->cmsg_flags)
533 ip_cmsg_recv(msg, skb);
534 }
535
536 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
537
538 /* Now we could try to dump offended packet options */
539
540 msg->msg_flags |= MSG_ERRQUEUE;
541 err = copied;
542
543 out_free_skb:
544 kfree_skb(skb);
545 out:
546 return err;
547 }
548
549
550 /*
551 * Socket option code for IP. This is the end of the line after any
552 * TCP,UDP etc options on an IP socket.
553 */
554 static bool setsockopt_needs_rtnl(int optname)
555 {
556 switch (optname) {
557 case IP_ADD_MEMBERSHIP:
558 case IP_ADD_SOURCE_MEMBERSHIP:
559 case IP_BLOCK_SOURCE:
560 case IP_DROP_MEMBERSHIP:
561 case IP_DROP_SOURCE_MEMBERSHIP:
562 case IP_MSFILTER:
563 case IP_UNBLOCK_SOURCE:
564 case MCAST_BLOCK_SOURCE:
565 case MCAST_MSFILTER:
566 case MCAST_JOIN_GROUP:
567 case MCAST_JOIN_SOURCE_GROUP:
568 case MCAST_LEAVE_GROUP:
569 case MCAST_LEAVE_SOURCE_GROUP:
570 case MCAST_UNBLOCK_SOURCE:
571 return true;
572 }
573 return false;
574 }
575
576 static int do_ip_setsockopt(struct sock *sk, int level,
577 int optname, char __user *optval, unsigned int optlen)
578 {
579 struct inet_sock *inet = inet_sk(sk);
580 int val = 0, err;
581 bool needs_rtnl = setsockopt_needs_rtnl(optname);
582
583 switch (optname) {
584 case IP_PKTINFO:
585 case IP_RECVTTL:
586 case IP_RECVOPTS:
587 case IP_RECVTOS:
588 case IP_RETOPTS:
589 case IP_TOS:
590 case IP_TTL:
591 case IP_HDRINCL:
592 case IP_MTU_DISCOVER:
593 case IP_RECVERR:
594 case IP_ROUTER_ALERT:
595 case IP_FREEBIND:
596 case IP_PASSSEC:
597 case IP_TRANSPARENT:
598 case IP_MINTTL:
599 case IP_NODEFRAG:
600 case IP_BIND_ADDRESS_NO_PORT:
601 case IP_UNICAST_IF:
602 case IP_MULTICAST_TTL:
603 case IP_MULTICAST_ALL:
604 case IP_MULTICAST_LOOP:
605 case IP_RECVORIGDSTADDR:
606 case IP_CHECKSUM:
607 if (optlen >= sizeof(int)) {
608 if (get_user(val, (int __user *) optval))
609 return -EFAULT;
610 } else if (optlen >= sizeof(char)) {
611 unsigned char ucval;
612
613 if (get_user(ucval, (unsigned char __user *) optval))
614 return -EFAULT;
615 val = (int) ucval;
616 }
617 }
618
619 /* If optlen==0, it is equivalent to val == 0 */
620
621 if (ip_mroute_opt(optname))
622 return ip_mroute_setsockopt(sk, optname, optval, optlen);
623
624 err = 0;
625 if (needs_rtnl)
626 rtnl_lock();
627 lock_sock(sk);
628
629 switch (optname) {
630 case IP_OPTIONS:
631 {
632 struct ip_options_rcu *old, *opt = NULL;
633
634 if (optlen > 40)
635 goto e_inval;
636 err = ip_options_get_from_user(sock_net(sk), &opt,
637 optval, optlen);
638 if (err)
639 break;
640 old = rcu_dereference_protected(inet->inet_opt,
641 sock_owned_by_user(sk));
642 if (inet->is_icsk) {
643 struct inet_connection_sock *icsk = inet_csk(sk);
644 #if IS_ENABLED(CONFIG_IPV6)
645 if (sk->sk_family == PF_INET ||
646 (!((1 << sk->sk_state) &
647 (TCPF_LISTEN | TCPF_CLOSE)) &&
648 inet->inet_daddr != LOOPBACK4_IPV6)) {
649 #endif
650 if (old)
651 icsk->icsk_ext_hdr_len -= old->opt.optlen;
652 if (opt)
653 icsk->icsk_ext_hdr_len += opt->opt.optlen;
654 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
655 #if IS_ENABLED(CONFIG_IPV6)
656 }
657 #endif
658 }
659 rcu_assign_pointer(inet->inet_opt, opt);
660 if (old)
661 kfree_rcu(old, rcu);
662 break;
663 }
664 case IP_PKTINFO:
665 if (val)
666 inet->cmsg_flags |= IP_CMSG_PKTINFO;
667 else
668 inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
669 break;
670 case IP_RECVTTL:
671 if (val)
672 inet->cmsg_flags |= IP_CMSG_TTL;
673 else
674 inet->cmsg_flags &= ~IP_CMSG_TTL;
675 break;
676 case IP_RECVTOS:
677 if (val)
678 inet->cmsg_flags |= IP_CMSG_TOS;
679 else
680 inet->cmsg_flags &= ~IP_CMSG_TOS;
681 break;
682 case IP_RECVOPTS:
683 if (val)
684 inet->cmsg_flags |= IP_CMSG_RECVOPTS;
685 else
686 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
687 break;
688 case IP_RETOPTS:
689 if (val)
690 inet->cmsg_flags |= IP_CMSG_RETOPTS;
691 else
692 inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
693 break;
694 case IP_PASSSEC:
695 if (val)
696 inet->cmsg_flags |= IP_CMSG_PASSSEC;
697 else
698 inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
699 break;
700 case IP_RECVORIGDSTADDR:
701 if (val)
702 inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR;
703 else
704 inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR;
705 break;
706 case IP_CHECKSUM:
707 if (val) {
708 if (!(inet->cmsg_flags & IP_CMSG_CHECKSUM)) {
709 inet_inc_convert_csum(sk);
710 inet->cmsg_flags |= IP_CMSG_CHECKSUM;
711 }
712 } else {
713 if (inet->cmsg_flags & IP_CMSG_CHECKSUM) {
714 inet_dec_convert_csum(sk);
715 inet->cmsg_flags &= ~IP_CMSG_CHECKSUM;
716 }
717 }
718 break;
719 case IP_TOS: /* This sets both TOS and Precedence */
720 if (sk->sk_type == SOCK_STREAM) {
721 val &= ~INET_ECN_MASK;
722 val |= inet->tos & INET_ECN_MASK;
723 }
724 if (inet->tos != val) {
725 inet->tos = val;
726 sk->sk_priority = rt_tos2priority(val);
727 sk_dst_reset(sk);
728 }
729 break;
730 case IP_TTL:
731 if (optlen < 1)
732 goto e_inval;
733 if (val != -1 && (val < 1 || val > 255))
734 goto e_inval;
735 inet->uc_ttl = val;
736 break;
737 case IP_HDRINCL:
738 if (sk->sk_type != SOCK_RAW) {
739 err = -ENOPROTOOPT;
740 break;
741 }
742 inet->hdrincl = val ? 1 : 0;
743 break;
744 case IP_NODEFRAG:
745 if (sk->sk_type != SOCK_RAW) {
746 err = -ENOPROTOOPT;
747 break;
748 }
749 inet->nodefrag = val ? 1 : 0;
750 break;
751 case IP_BIND_ADDRESS_NO_PORT:
752 inet->bind_address_no_port = val ? 1 : 0;
753 break;
754 case IP_MTU_DISCOVER:
755 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_OMIT)
756 goto e_inval;
757 inet->pmtudisc = val;
758 break;
759 case IP_RECVERR:
760 inet->recverr = !!val;
761 if (!val)
762 skb_queue_purge(&sk->sk_error_queue);
763 break;
764 case IP_MULTICAST_TTL:
765 if (sk->sk_type == SOCK_STREAM)
766 goto e_inval;
767 if (optlen < 1)
768 goto e_inval;
769 if (val == -1)
770 val = 1;
771 if (val < 0 || val > 255)
772 goto e_inval;
773 inet->mc_ttl = val;
774 break;
775 case IP_MULTICAST_LOOP:
776 if (optlen < 1)
777 goto e_inval;
778 inet->mc_loop = !!val;
779 break;
780 case IP_UNICAST_IF:
781 {
782 struct net_device *dev = NULL;
783 int ifindex;
784
785 if (optlen != sizeof(int))
786 goto e_inval;
787
788 ifindex = (__force int)ntohl((__force __be32)val);
789 if (ifindex == 0) {
790 inet->uc_index = 0;
791 err = 0;
792 break;
793 }
794
795 dev = dev_get_by_index(sock_net(sk), ifindex);
796 err = -EADDRNOTAVAIL;
797 if (!dev)
798 break;
799 dev_put(dev);
800
801 err = -EINVAL;
802 if (sk->sk_bound_dev_if)
803 break;
804
805 inet->uc_index = ifindex;
806 err = 0;
807 break;
808 }
809 case IP_MULTICAST_IF:
810 {
811 struct ip_mreqn mreq;
812 struct net_device *dev = NULL;
813 int midx;
814
815 if (sk->sk_type == SOCK_STREAM)
816 goto e_inval;
817 /*
818 * Check the arguments are allowable
819 */
820
821 if (optlen < sizeof(struct in_addr))
822 goto e_inval;
823
824 err = -EFAULT;
825 if (optlen >= sizeof(struct ip_mreqn)) {
826 if (copy_from_user(&mreq, optval, sizeof(mreq)))
827 break;
828 } else {
829 memset(&mreq, 0, sizeof(mreq));
830 if (optlen >= sizeof(struct ip_mreq)) {
831 if (copy_from_user(&mreq, optval,
832 sizeof(struct ip_mreq)))
833 break;
834 } else if (optlen >= sizeof(struct in_addr)) {
835 if (copy_from_user(&mreq.imr_address, optval,
836 sizeof(struct in_addr)))
837 break;
838 }
839 }
840
841 if (!mreq.imr_ifindex) {
842 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) {
843 inet->mc_index = 0;
844 inet->mc_addr = 0;
845 err = 0;
846 break;
847 }
848 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr);
849 if (dev)
850 mreq.imr_ifindex = dev->ifindex;
851 } else
852 dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex);
853
854
855 err = -EADDRNOTAVAIL;
856 if (!dev)
857 break;
858
859 midx = l3mdev_master_ifindex(dev);
860
861 dev_put(dev);
862
863 err = -EINVAL;
864 if (sk->sk_bound_dev_if &&
865 mreq.imr_ifindex != sk->sk_bound_dev_if &&
866 (!midx || midx != sk->sk_bound_dev_if))
867 break;
868
869 inet->mc_index = mreq.imr_ifindex;
870 inet->mc_addr = mreq.imr_address.s_addr;
871 err = 0;
872 break;
873 }
874
875 case IP_ADD_MEMBERSHIP:
876 case IP_DROP_MEMBERSHIP:
877 {
878 struct ip_mreqn mreq;
879
880 err = -EPROTO;
881 if (inet_sk(sk)->is_icsk)
882 break;
883
884 if (optlen < sizeof(struct ip_mreq))
885 goto e_inval;
886 err = -EFAULT;
887 if (optlen >= sizeof(struct ip_mreqn)) {
888 if (copy_from_user(&mreq, optval, sizeof(mreq)))
889 break;
890 } else {
891 memset(&mreq, 0, sizeof(mreq));
892 if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq)))
893 break;
894 }
895
896 if (optname == IP_ADD_MEMBERSHIP)
897 err = ip_mc_join_group(sk, &mreq);
898 else
899 err = ip_mc_leave_group(sk, &mreq);
900 break;
901 }
902 case IP_MSFILTER:
903 {
904 struct ip_msfilter *msf;
905
906 if (optlen < IP_MSFILTER_SIZE(0))
907 goto e_inval;
908 if (optlen > sysctl_optmem_max) {
909 err = -ENOBUFS;
910 break;
911 }
912 msf = kmalloc(optlen, GFP_KERNEL);
913 if (!msf) {
914 err = -ENOBUFS;
915 break;
916 }
917 err = -EFAULT;
918 if (copy_from_user(msf, optval, optlen)) {
919 kfree(msf);
920 break;
921 }
922 /* numsrc >= (1G-4) overflow in 32 bits */
923 if (msf->imsf_numsrc >= 0x3ffffffcU ||
924 msf->imsf_numsrc > sysctl_igmp_max_msf) {
925 kfree(msf);
926 err = -ENOBUFS;
927 break;
928 }
929 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
930 kfree(msf);
931 err = -EINVAL;
932 break;
933 }
934 err = ip_mc_msfilter(sk, msf, 0);
935 kfree(msf);
936 break;
937 }
938 case IP_BLOCK_SOURCE:
939 case IP_UNBLOCK_SOURCE:
940 case IP_ADD_SOURCE_MEMBERSHIP:
941 case IP_DROP_SOURCE_MEMBERSHIP:
942 {
943 struct ip_mreq_source mreqs;
944 int omode, add;
945
946 if (optlen != sizeof(struct ip_mreq_source))
947 goto e_inval;
948 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
949 err = -EFAULT;
950 break;
951 }
952 if (optname == IP_BLOCK_SOURCE) {
953 omode = MCAST_EXCLUDE;
954 add = 1;
955 } else if (optname == IP_UNBLOCK_SOURCE) {
956 omode = MCAST_EXCLUDE;
957 add = 0;
958 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
959 struct ip_mreqn mreq;
960
961 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
962 mreq.imr_address.s_addr = mreqs.imr_interface;
963 mreq.imr_ifindex = 0;
964 err = ip_mc_join_group(sk, &mreq);
965 if (err && err != -EADDRINUSE)
966 break;
967 omode = MCAST_INCLUDE;
968 add = 1;
969 } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
970 omode = MCAST_INCLUDE;
971 add = 0;
972 }
973 err = ip_mc_source(add, omode, sk, &mreqs, 0);
974 break;
975 }
976 case MCAST_JOIN_GROUP:
977 case MCAST_LEAVE_GROUP:
978 {
979 struct group_req greq;
980 struct sockaddr_in *psin;
981 struct ip_mreqn mreq;
982
983 if (optlen < sizeof(struct group_req))
984 goto e_inval;
985 err = -EFAULT;
986 if (copy_from_user(&greq, optval, sizeof(greq)))
987 break;
988 psin = (struct sockaddr_in *)&greq.gr_group;
989 if (psin->sin_family != AF_INET)
990 goto e_inval;
991 memset(&mreq, 0, sizeof(mreq));
992 mreq.imr_multiaddr = psin->sin_addr;
993 mreq.imr_ifindex = greq.gr_interface;
994
995 if (optname == MCAST_JOIN_GROUP)
996 err = ip_mc_join_group(sk, &mreq);
997 else
998 err = ip_mc_leave_group(sk, &mreq);
999 break;
1000 }
1001 case MCAST_JOIN_SOURCE_GROUP:
1002 case MCAST_LEAVE_SOURCE_GROUP:
1003 case MCAST_BLOCK_SOURCE:
1004 case MCAST_UNBLOCK_SOURCE:
1005 {
1006 struct group_source_req greqs;
1007 struct ip_mreq_source mreqs;
1008 struct sockaddr_in *psin;
1009 int omode, add;
1010
1011 if (optlen != sizeof(struct group_source_req))
1012 goto e_inval;
1013 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
1014 err = -EFAULT;
1015 break;
1016 }
1017 if (greqs.gsr_group.ss_family != AF_INET ||
1018 greqs.gsr_source.ss_family != AF_INET) {
1019 err = -EADDRNOTAVAIL;
1020 break;
1021 }
1022 psin = (struct sockaddr_in *)&greqs.gsr_group;
1023 mreqs.imr_multiaddr = psin->sin_addr.s_addr;
1024 psin = (struct sockaddr_in *)&greqs.gsr_source;
1025 mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
1026 mreqs.imr_interface = 0; /* use index for mc_source */
1027
1028 if (optname == MCAST_BLOCK_SOURCE) {
1029 omode = MCAST_EXCLUDE;
1030 add = 1;
1031 } else if (optname == MCAST_UNBLOCK_SOURCE) {
1032 omode = MCAST_EXCLUDE;
1033 add = 0;
1034 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
1035 struct ip_mreqn mreq;
1036
1037 psin = (struct sockaddr_in *)&greqs.gsr_group;
1038 mreq.imr_multiaddr = psin->sin_addr;
1039 mreq.imr_address.s_addr = 0;
1040 mreq.imr_ifindex = greqs.gsr_interface;
1041 err = ip_mc_join_group(sk, &mreq);
1042 if (err && err != -EADDRINUSE)
1043 break;
1044 greqs.gsr_interface = mreq.imr_ifindex;
1045 omode = MCAST_INCLUDE;
1046 add = 1;
1047 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
1048 omode = MCAST_INCLUDE;
1049 add = 0;
1050 }
1051 err = ip_mc_source(add, omode, sk, &mreqs,
1052 greqs.gsr_interface);
1053 break;
1054 }
1055 case MCAST_MSFILTER:
1056 {
1057 struct sockaddr_in *psin;
1058 struct ip_msfilter *msf = NULL;
1059 struct group_filter *gsf = NULL;
1060 int msize, i, ifindex;
1061
1062 if (optlen < GROUP_FILTER_SIZE(0))
1063 goto e_inval;
1064 if (optlen > sysctl_optmem_max) {
1065 err = -ENOBUFS;
1066 break;
1067 }
1068 gsf = kmalloc(optlen, GFP_KERNEL);
1069 if (!gsf) {
1070 err = -ENOBUFS;
1071 break;
1072 }
1073 err = -EFAULT;
1074 if (copy_from_user(gsf, optval, optlen))
1075 goto mc_msf_out;
1076
1077 /* numsrc >= (4G-140)/128 overflow in 32 bits */
1078 if (gsf->gf_numsrc >= 0x1ffffff ||
1079 gsf->gf_numsrc > sysctl_igmp_max_msf) {
1080 err = -ENOBUFS;
1081 goto mc_msf_out;
1082 }
1083 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
1084 err = -EINVAL;
1085 goto mc_msf_out;
1086 }
1087 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
1088 msf = kmalloc(msize, GFP_KERNEL);
1089 if (!msf) {
1090 err = -ENOBUFS;
1091 goto mc_msf_out;
1092 }
1093 ifindex = gsf->gf_interface;
1094 psin = (struct sockaddr_in *)&gsf->gf_group;
1095 if (psin->sin_family != AF_INET) {
1096 err = -EADDRNOTAVAIL;
1097 goto mc_msf_out;
1098 }
1099 msf->imsf_multiaddr = psin->sin_addr.s_addr;
1100 msf->imsf_interface = 0;
1101 msf->imsf_fmode = gsf->gf_fmode;
1102 msf->imsf_numsrc = gsf->gf_numsrc;
1103 err = -EADDRNOTAVAIL;
1104 for (i = 0; i < gsf->gf_numsrc; ++i) {
1105 psin = (struct sockaddr_in *)&gsf->gf_slist[i];
1106
1107 if (psin->sin_family != AF_INET)
1108 goto mc_msf_out;
1109 msf->imsf_slist[i] = psin->sin_addr.s_addr;
1110 }
1111 kfree(gsf);
1112 gsf = NULL;
1113
1114 err = ip_mc_msfilter(sk, msf, ifindex);
1115 mc_msf_out:
1116 kfree(msf);
1117 kfree(gsf);
1118 break;
1119 }
1120 case IP_MULTICAST_ALL:
1121 if (optlen < 1)
1122 goto e_inval;
1123 if (val != 0 && val != 1)
1124 goto e_inval;
1125 inet->mc_all = val;
1126 break;
1127 case IP_ROUTER_ALERT:
1128 err = ip_ra_control(sk, val ? 1 : 0, NULL);
1129 break;
1130
1131 case IP_FREEBIND:
1132 if (optlen < 1)
1133 goto e_inval;
1134 inet->freebind = !!val;
1135 break;
1136
1137 case IP_IPSEC_POLICY:
1138 case IP_XFRM_POLICY:
1139 err = -EPERM;
1140 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1141 break;
1142 err = xfrm_user_policy(sk, optname, optval, optlen);
1143 break;
1144
1145 case IP_TRANSPARENT:
1146 if (!!val && !ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) &&
1147 !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
1148 err = -EPERM;
1149 break;
1150 }
1151 if (optlen < 1)
1152 goto e_inval;
1153 inet->transparent = !!val;
1154 break;
1155
1156 case IP_MINTTL:
1157 if (optlen < 1)
1158 goto e_inval;
1159 if (val < 0 || val > 255)
1160 goto e_inval;
1161 inet->min_ttl = val;
1162 break;
1163
1164 default:
1165 err = -ENOPROTOOPT;
1166 break;
1167 }
1168 release_sock(sk);
1169 if (needs_rtnl)
1170 rtnl_unlock();
1171 return err;
1172
1173 e_inval:
1174 release_sock(sk);
1175 if (needs_rtnl)
1176 rtnl_unlock();
1177 return -EINVAL;
1178 }
1179
1180 /**
1181 * ipv4_pktinfo_prepare - transfer some info from rtable to skb
1182 * @sk: socket
1183 * @skb: buffer
1184 *
1185 * To support IP_CMSG_PKTINFO option, we store rt_iif and specific
1186 * destination in skb->cb[] before dst drop.
1187 * This way, receiver doesn't make cache line misses to read rtable.
1188 */
1189 void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb)
1190 {
1191 struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb);
1192 bool prepare = (inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) ||
1193 ipv6_sk_rxinfo(sk);
1194
1195 if (prepare && skb_rtable(skb)) {
1196 pktinfo->ipi_ifindex = inet_iif(skb);
1197 pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb);
1198 } else {
1199 pktinfo->ipi_ifindex = 0;
1200 pktinfo->ipi_spec_dst.s_addr = 0;
1201 }
1202 /* We need to keep the dst for __ip_options_echo()
1203 * We could restrict the test to opt.ts_needtime || opt.srr,
1204 * but the following is good enough as IP options are not often used.
1205 */
1206 if (unlikely(IPCB(skb)->opt.optlen))
1207 skb_dst_force(skb);
1208 else
1209 skb_dst_drop(skb);
1210 }
1211
1212 int ip_setsockopt(struct sock *sk, int level,
1213 int optname, char __user *optval, unsigned int optlen)
1214 {
1215 int err;
1216
1217 if (level != SOL_IP)
1218 return -ENOPROTOOPT;
1219
1220 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1221 #ifdef CONFIG_NETFILTER
1222 /* we need to exclude all possible ENOPROTOOPTs except default case */
1223 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
1224 optname != IP_IPSEC_POLICY &&
1225 optname != IP_XFRM_POLICY &&
1226 !ip_mroute_opt(optname))
1227 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
1228 #endif
1229 return err;
1230 }
1231 EXPORT_SYMBOL(ip_setsockopt);
1232
1233 #ifdef CONFIG_COMPAT
1234 int compat_ip_setsockopt(struct sock *sk, int level, int optname,
1235 char __user *optval, unsigned int optlen)
1236 {
1237 int err;
1238
1239 if (level != SOL_IP)
1240 return -ENOPROTOOPT;
1241
1242 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
1243 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
1244 ip_setsockopt);
1245
1246 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1247 #ifdef CONFIG_NETFILTER
1248 /* we need to exclude all possible ENOPROTOOPTs except default case */
1249 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
1250 optname != IP_IPSEC_POLICY &&
1251 optname != IP_XFRM_POLICY &&
1252 !ip_mroute_opt(optname))
1253 err = compat_nf_setsockopt(sk, PF_INET, optname, optval,
1254 optlen);
1255 #endif
1256 return err;
1257 }
1258 EXPORT_SYMBOL(compat_ip_setsockopt);
1259 #endif
1260
1261 /*
1262 * Get the options. Note for future reference. The GET of IP options gets
1263 * the _received_ ones. The set sets the _sent_ ones.
1264 */
1265
1266 static bool getsockopt_needs_rtnl(int optname)
1267 {
1268 switch (optname) {
1269 case IP_MSFILTER:
1270 case MCAST_MSFILTER:
1271 return true;
1272 }
1273 return false;
1274 }
1275
1276 static int do_ip_getsockopt(struct sock *sk, int level, int optname,
1277 char __user *optval, int __user *optlen, unsigned int flags)
1278 {
1279 struct inet_sock *inet = inet_sk(sk);
1280 bool needs_rtnl = getsockopt_needs_rtnl(optname);
1281 int val, err = 0;
1282 int len;
1283
1284 if (level != SOL_IP)
1285 return -EOPNOTSUPP;
1286
1287 if (ip_mroute_opt(optname))
1288 return ip_mroute_getsockopt(sk, optname, optval, optlen);
1289
1290 if (get_user(len, optlen))
1291 return -EFAULT;
1292 if (len < 0)
1293 return -EINVAL;
1294
1295 if (needs_rtnl)
1296 rtnl_lock();
1297 lock_sock(sk);
1298
1299 switch (optname) {
1300 case IP_OPTIONS:
1301 {
1302 unsigned char optbuf[sizeof(struct ip_options)+40];
1303 struct ip_options *opt = (struct ip_options *)optbuf;
1304 struct ip_options_rcu *inet_opt;
1305
1306 inet_opt = rcu_dereference_protected(inet->inet_opt,
1307 sock_owned_by_user(sk));
1308 opt->optlen = 0;
1309 if (inet_opt)
1310 memcpy(optbuf, &inet_opt->opt,
1311 sizeof(struct ip_options) +
1312 inet_opt->opt.optlen);
1313 release_sock(sk);
1314
1315 if (opt->optlen == 0)
1316 return put_user(0, optlen);
1317
1318 ip_options_undo(opt);
1319
1320 len = min_t(unsigned int, len, opt->optlen);
1321 if (put_user(len, optlen))
1322 return -EFAULT;
1323 if (copy_to_user(optval, opt->__data, len))
1324 return -EFAULT;
1325 return 0;
1326 }
1327 case IP_PKTINFO:
1328 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
1329 break;
1330 case IP_RECVTTL:
1331 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
1332 break;
1333 case IP_RECVTOS:
1334 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
1335 break;
1336 case IP_RECVOPTS:
1337 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
1338 break;
1339 case IP_RETOPTS:
1340 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
1341 break;
1342 case IP_PASSSEC:
1343 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
1344 break;
1345 case IP_RECVORIGDSTADDR:
1346 val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0;
1347 break;
1348 case IP_CHECKSUM:
1349 val = (inet->cmsg_flags & IP_CMSG_CHECKSUM) != 0;
1350 break;
1351 case IP_TOS:
1352 val = inet->tos;
1353 break;
1354 case IP_TTL:
1355 val = (inet->uc_ttl == -1 ?
1356 sysctl_ip_default_ttl :
1357 inet->uc_ttl);
1358 break;
1359 case IP_HDRINCL:
1360 val = inet->hdrincl;
1361 break;
1362 case IP_NODEFRAG:
1363 val = inet->nodefrag;
1364 break;
1365 case IP_BIND_ADDRESS_NO_PORT:
1366 val = inet->bind_address_no_port;
1367 break;
1368 case IP_MTU_DISCOVER:
1369 val = inet->pmtudisc;
1370 break;
1371 case IP_MTU:
1372 {
1373 struct dst_entry *dst;
1374 val = 0;
1375 dst = sk_dst_get(sk);
1376 if (dst) {
1377 val = dst_mtu(dst);
1378 dst_release(dst);
1379 }
1380 if (!val) {
1381 release_sock(sk);
1382 return -ENOTCONN;
1383 }
1384 break;
1385 }
1386 case IP_RECVERR:
1387 val = inet->recverr;
1388 break;
1389 case IP_MULTICAST_TTL:
1390 val = inet->mc_ttl;
1391 break;
1392 case IP_MULTICAST_LOOP:
1393 val = inet->mc_loop;
1394 break;
1395 case IP_UNICAST_IF:
1396 val = (__force int)htonl((__u32) inet->uc_index);
1397 break;
1398 case IP_MULTICAST_IF:
1399 {
1400 struct in_addr addr;
1401 len = min_t(unsigned int, len, sizeof(struct in_addr));
1402 addr.s_addr = inet->mc_addr;
1403 release_sock(sk);
1404
1405 if (put_user(len, optlen))
1406 return -EFAULT;
1407 if (copy_to_user(optval, &addr, len))
1408 return -EFAULT;
1409 return 0;
1410 }
1411 case IP_MSFILTER:
1412 {
1413 struct ip_msfilter msf;
1414
1415 if (len < IP_MSFILTER_SIZE(0)) {
1416 err = -EINVAL;
1417 goto out;
1418 }
1419 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
1420 err = -EFAULT;
1421 goto out;
1422 }
1423 err = ip_mc_msfget(sk, &msf,
1424 (struct ip_msfilter __user *)optval, optlen);
1425 goto out;
1426 }
1427 case MCAST_MSFILTER:
1428 {
1429 struct group_filter gsf;
1430
1431 if (len < GROUP_FILTER_SIZE(0)) {
1432 err = -EINVAL;
1433 goto out;
1434 }
1435 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
1436 err = -EFAULT;
1437 goto out;
1438 }
1439 err = ip_mc_gsfget(sk, &gsf,
1440 (struct group_filter __user *)optval,
1441 optlen);
1442 goto out;
1443 }
1444 case IP_MULTICAST_ALL:
1445 val = inet->mc_all;
1446 break;
1447 case IP_PKTOPTIONS:
1448 {
1449 struct msghdr msg;
1450
1451 release_sock(sk);
1452
1453 if (sk->sk_type != SOCK_STREAM)
1454 return -ENOPROTOOPT;
1455
1456 msg.msg_control = (__force void *) optval;
1457 msg.msg_controllen = len;
1458 msg.msg_flags = flags;
1459
1460 if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
1461 struct in_pktinfo info;
1462
1463 info.ipi_addr.s_addr = inet->inet_rcv_saddr;
1464 info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr;
1465 info.ipi_ifindex = inet->mc_index;
1466 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
1467 }
1468 if (inet->cmsg_flags & IP_CMSG_TTL) {
1469 int hlim = inet->mc_ttl;
1470 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
1471 }
1472 if (inet->cmsg_flags & IP_CMSG_TOS) {
1473 int tos = inet->rcv_tos;
1474 put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos);
1475 }
1476 len -= msg.msg_controllen;
1477 return put_user(len, optlen);
1478 }
1479 case IP_FREEBIND:
1480 val = inet->freebind;
1481 break;
1482 case IP_TRANSPARENT:
1483 val = inet->transparent;
1484 break;
1485 case IP_MINTTL:
1486 val = inet->min_ttl;
1487 break;
1488 default:
1489 release_sock(sk);
1490 return -ENOPROTOOPT;
1491 }
1492 release_sock(sk);
1493
1494 if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) {
1495 unsigned char ucval = (unsigned char)val;
1496 len = 1;
1497 if (put_user(len, optlen))
1498 return -EFAULT;
1499 if (copy_to_user(optval, &ucval, 1))
1500 return -EFAULT;
1501 } else {
1502 len = min_t(unsigned int, sizeof(int), len);
1503 if (put_user(len, optlen))
1504 return -EFAULT;
1505 if (copy_to_user(optval, &val, len))
1506 return -EFAULT;
1507 }
1508 return 0;
1509
1510 out:
1511 release_sock(sk);
1512 if (needs_rtnl)
1513 rtnl_unlock();
1514 return err;
1515 }
1516
1517 int ip_getsockopt(struct sock *sk, int level,
1518 int optname, char __user *optval, int __user *optlen)
1519 {
1520 int err;
1521
1522 err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0);
1523 #ifdef CONFIG_NETFILTER
1524 /* we need to exclude all possible ENOPROTOOPTs except default case */
1525 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1526 !ip_mroute_opt(optname)) {
1527 int len;
1528
1529 if (get_user(len, optlen))
1530 return -EFAULT;
1531
1532 err = nf_getsockopt(sk, PF_INET, optname, optval, &len);
1533 if (err >= 0)
1534 err = put_user(len, optlen);
1535 return err;
1536 }
1537 #endif
1538 return err;
1539 }
1540 EXPORT_SYMBOL(ip_getsockopt);
1541
1542 #ifdef CONFIG_COMPAT
1543 int compat_ip_getsockopt(struct sock *sk, int level, int optname,
1544 char __user *optval, int __user *optlen)
1545 {
1546 int err;
1547
1548 if (optname == MCAST_MSFILTER)
1549 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1550 ip_getsockopt);
1551
1552 err = do_ip_getsockopt(sk, level, optname, optval, optlen,
1553 MSG_CMSG_COMPAT);
1554
1555 #ifdef CONFIG_NETFILTER
1556 /* we need to exclude all possible ENOPROTOOPTs except default case */
1557 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1558 !ip_mroute_opt(optname)) {
1559 int len;
1560
1561 if (get_user(len, optlen))
1562 return -EFAULT;
1563
1564 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
1565 if (err >= 0)
1566 err = put_user(len, optlen);
1567 return err;
1568 }
1569 #endif
1570 return err;
1571 }
1572 EXPORT_SYMBOL(compat_ip_getsockopt);
1573 #endif
Linux with added FPC-III support