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inet: fix sleeping inside inet_wait_for_connect()
[mirror_ubuntu-bionic-kernel.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 #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 csum = csum_sub(csum,
110 csum_partial(skb_transport_header(skb) + tlen,
111 offset, 0));
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 const struct iphdr *iph = ip_hdr(skb);
138 __be16 *ports = (__be16 *)skb_transport_header(skb);
139
140 if (skb_transport_offset(skb) + 4 > skb->len)
141 return;
142
143 /* All current transport protocols have the port numbers in the
144 * first four bytes of the transport header and this function is
145 * written with this assumption in mind.
146 */
147
148 sin.sin_family = AF_INET;
149 sin.sin_addr.s_addr = iph->daddr;
150 sin.sin_port = ports[1];
151 memset(sin.sin_zero, 0, sizeof(sin.sin_zero));
152
153 put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin);
154 }
155
156 void ip_cmsg_recv_offset(struct msghdr *msg, struct sk_buff *skb,
157 int tlen, int offset)
158 {
159 struct inet_sock *inet = inet_sk(skb->sk);
160 unsigned int flags = inet->cmsg_flags;
161
162 /* Ordered by supposed usage frequency */
163 if (flags & IP_CMSG_PKTINFO) {
164 ip_cmsg_recv_pktinfo(msg, skb);
165
166 flags &= ~IP_CMSG_PKTINFO;
167 if (!flags)
168 return;
169 }
170
171 if (flags & IP_CMSG_TTL) {
172 ip_cmsg_recv_ttl(msg, skb);
173
174 flags &= ~IP_CMSG_TTL;
175 if (!flags)
176 return;
177 }
178
179 if (flags & IP_CMSG_TOS) {
180 ip_cmsg_recv_tos(msg, skb);
181
182 flags &= ~IP_CMSG_TOS;
183 if (!flags)
184 return;
185 }
186
187 if (flags & IP_CMSG_RECVOPTS) {
188 ip_cmsg_recv_opts(msg, skb);
189
190 flags &= ~IP_CMSG_RECVOPTS;
191 if (!flags)
192 return;
193 }
194
195 if (flags & IP_CMSG_RETOPTS) {
196 ip_cmsg_recv_retopts(msg, skb);
197
198 flags &= ~IP_CMSG_RETOPTS;
199 if (!flags)
200 return;
201 }
202
203 if (flags & IP_CMSG_PASSSEC) {
204 ip_cmsg_recv_security(msg, skb);
205
206 flags &= ~IP_CMSG_PASSSEC;
207 if (!flags)
208 return;
209 }
210
211 if (flags & IP_CMSG_ORIGDSTADDR) {
212 ip_cmsg_recv_dstaddr(msg, skb);
213
214 flags &= ~IP_CMSG_ORIGDSTADDR;
215 if (!flags)
216 return;
217 }
218
219 if (flags & IP_CMSG_CHECKSUM)
220 ip_cmsg_recv_checksum(msg, skb, tlen, offset);
221 }
222 EXPORT_SYMBOL(ip_cmsg_recv_offset);
223
224 int ip_cmsg_send(struct sock *sk, struct msghdr *msg, struct ipcm_cookie *ipc,
225 bool allow_ipv6)
226 {
227 int err, val;
228 struct cmsghdr *cmsg;
229 struct net *net = sock_net(sk);
230
231 for_each_cmsghdr(cmsg, msg) {
232 if (!CMSG_OK(msg, cmsg))
233 return -EINVAL;
234 #if IS_ENABLED(CONFIG_IPV6)
235 if (allow_ipv6 &&
236 cmsg->cmsg_level == SOL_IPV6 &&
237 cmsg->cmsg_type == IPV6_PKTINFO) {
238 struct in6_pktinfo *src_info;
239
240 if (cmsg->cmsg_len < CMSG_LEN(sizeof(*src_info)))
241 return -EINVAL;
242 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
243 if (!ipv6_addr_v4mapped(&src_info->ipi6_addr))
244 return -EINVAL;
245 ipc->oif = src_info->ipi6_ifindex;
246 ipc->addr = src_info->ipi6_addr.s6_addr32[3];
247 continue;
248 }
249 #endif
250 if (cmsg->cmsg_level == SOL_SOCKET) {
251 err = __sock_cmsg_send(sk, msg, cmsg, &ipc->sockc);
252 if (err)
253 return err;
254 continue;
255 }
256
257 if (cmsg->cmsg_level != SOL_IP)
258 continue;
259 switch (cmsg->cmsg_type) {
260 case IP_RETOPTS:
261 err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
262
263 /* Our caller is responsible for freeing ipc->opt */
264 err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg),
265 err < 40 ? err : 40);
266 if (err)
267 return err;
268 break;
269 case IP_PKTINFO:
270 {
271 struct in_pktinfo *info;
272 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
273 return -EINVAL;
274 info = (struct in_pktinfo *)CMSG_DATA(cmsg);
275 ipc->oif = info->ipi_ifindex;
276 ipc->addr = info->ipi_spec_dst.s_addr;
277 break;
278 }
279 case IP_TTL:
280 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
281 return -EINVAL;
282 val = *(int *)CMSG_DATA(cmsg);
283 if (val < 1 || val > 255)
284 return -EINVAL;
285 ipc->ttl = val;
286 break;
287 case IP_TOS:
288 if (cmsg->cmsg_len == CMSG_LEN(sizeof(int)))
289 val = *(int *)CMSG_DATA(cmsg);
290 else if (cmsg->cmsg_len == CMSG_LEN(sizeof(u8)))
291 val = *(u8 *)CMSG_DATA(cmsg);
292 else
293 return -EINVAL;
294 if (val < 0 || val > 255)
295 return -EINVAL;
296 ipc->tos = val;
297 ipc->priority = rt_tos2priority(ipc->tos);
298 break;
299
300 default:
301 return -EINVAL;
302 }
303 }
304 return 0;
305 }
306
307
308 /* Special input handler for packets caught by router alert option.
309 They are selected only by protocol field, and then processed likely
310 local ones; but only if someone wants them! Otherwise, router
311 not running rsvpd will kill RSVP.
312
313 It is user level problem, what it will make with them.
314 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
315 but receiver should be enough clever f.e. to forward mtrace requests,
316 sent to multicast group to reach destination designated router.
317 */
318 struct ip_ra_chain __rcu *ip_ra_chain;
319 static DEFINE_SPINLOCK(ip_ra_lock);
320
321
322 static void ip_ra_destroy_rcu(struct rcu_head *head)
323 {
324 struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu);
325
326 sock_put(ra->saved_sk);
327 kfree(ra);
328 }
329
330 int ip_ra_control(struct sock *sk, unsigned char on,
331 void (*destructor)(struct sock *))
332 {
333 struct ip_ra_chain *ra, *new_ra;
334 struct ip_ra_chain __rcu **rap;
335
336 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW)
337 return -EINVAL;
338
339 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
340
341 spin_lock_bh(&ip_ra_lock);
342 for (rap = &ip_ra_chain;
343 (ra = rcu_dereference_protected(*rap,
344 lockdep_is_held(&ip_ra_lock))) != NULL;
345 rap = &ra->next) {
346 if (ra->sk == sk) {
347 if (on) {
348 spin_unlock_bh(&ip_ra_lock);
349 kfree(new_ra);
350 return -EADDRINUSE;
351 }
352 /* dont let ip_call_ra_chain() use sk again */
353 ra->sk = NULL;
354 RCU_INIT_POINTER(*rap, ra->next);
355 spin_unlock_bh(&ip_ra_lock);
356
357 if (ra->destructor)
358 ra->destructor(sk);
359 /*
360 * Delay sock_put(sk) and kfree(ra) after one rcu grace
361 * period. This guarantee ip_call_ra_chain() dont need
362 * to mess with socket refcounts.
363 */
364 ra->saved_sk = sk;
365 call_rcu(&ra->rcu, ip_ra_destroy_rcu);
366 return 0;
367 }
368 }
369 if (!new_ra) {
370 spin_unlock_bh(&ip_ra_lock);
371 return -ENOBUFS;
372 }
373 new_ra->sk = sk;
374 new_ra->destructor = destructor;
375
376 RCU_INIT_POINTER(new_ra->next, ra);
377 rcu_assign_pointer(*rap, new_ra);
378 sock_hold(sk);
379 spin_unlock_bh(&ip_ra_lock);
380
381 return 0;
382 }
383
384 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
385 __be16 port, u32 info, u8 *payload)
386 {
387 struct sock_exterr_skb *serr;
388
389 skb = skb_clone(skb, GFP_ATOMIC);
390 if (!skb)
391 return;
392
393 serr = SKB_EXT_ERR(skb);
394 serr->ee.ee_errno = err;
395 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
396 serr->ee.ee_type = icmp_hdr(skb)->type;
397 serr->ee.ee_code = icmp_hdr(skb)->code;
398 serr->ee.ee_pad = 0;
399 serr->ee.ee_info = info;
400 serr->ee.ee_data = 0;
401 serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) -
402 skb_network_header(skb);
403 serr->port = port;
404
405 if (skb_pull(skb, payload - skb->data)) {
406 skb_reset_transport_header(skb);
407 if (sock_queue_err_skb(sk, skb) == 0)
408 return;
409 }
410 kfree_skb(skb);
411 }
412
413 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info)
414 {
415 struct inet_sock *inet = inet_sk(sk);
416 struct sock_exterr_skb *serr;
417 struct iphdr *iph;
418 struct sk_buff *skb;
419
420 if (!inet->recverr)
421 return;
422
423 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
424 if (!skb)
425 return;
426
427 skb_put(skb, sizeof(struct iphdr));
428 skb_reset_network_header(skb);
429 iph = ip_hdr(skb);
430 iph->daddr = daddr;
431
432 serr = SKB_EXT_ERR(skb);
433 serr->ee.ee_errno = err;
434 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
435 serr->ee.ee_type = 0;
436 serr->ee.ee_code = 0;
437 serr->ee.ee_pad = 0;
438 serr->ee.ee_info = info;
439 serr->ee.ee_data = 0;
440 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
441 serr->port = port;
442
443 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
444 skb_reset_transport_header(skb);
445
446 if (sock_queue_err_skb(sk, skb))
447 kfree_skb(skb);
448 }
449
450 /* For some errors we have valid addr_offset even with zero payload and
451 * zero port. Also, addr_offset should be supported if port is set.
452 */
453 static inline bool ipv4_datagram_support_addr(struct sock_exterr_skb *serr)
454 {
455 return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
456 serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port;
457 }
458
459 /* IPv4 supports cmsg on all imcp errors and some timestamps
460 *
461 * Timestamp code paths do not initialize the fields expected by cmsg:
462 * the PKTINFO fields in skb->cb[]. Fill those in here.
463 */
464 static bool ipv4_datagram_support_cmsg(const struct sock *sk,
465 struct sk_buff *skb,
466 int ee_origin)
467 {
468 struct in_pktinfo *info;
469
470 if (ee_origin == SO_EE_ORIGIN_ICMP)
471 return true;
472
473 if (ee_origin == SO_EE_ORIGIN_LOCAL)
474 return false;
475
476 /* Support IP_PKTINFO on tstamp packets if requested, to correlate
477 * timestamp with egress dev. Not possible for packets without dev
478 * or without payload (SOF_TIMESTAMPING_OPT_TSONLY).
479 */
480 if ((!(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_CMSG)) ||
481 (!skb->dev))
482 return false;
483
484 info = PKTINFO_SKB_CB(skb);
485 info->ipi_spec_dst.s_addr = ip_hdr(skb)->saddr;
486 info->ipi_ifindex = skb->dev->ifindex;
487 return true;
488 }
489
490 /*
491 * Handle MSG_ERRQUEUE
492 */
493 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
494 {
495 struct sock_exterr_skb *serr;
496 struct sk_buff *skb;
497 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name);
498 struct {
499 struct sock_extended_err ee;
500 struct sockaddr_in offender;
501 } errhdr;
502 int err;
503 int copied;
504
505 WARN_ON_ONCE(sk->sk_family == AF_INET6);
506
507 err = -EAGAIN;
508 skb = sock_dequeue_err_skb(sk);
509 if (!skb)
510 goto out;
511
512 copied = skb->len;
513 if (copied > len) {
514 msg->msg_flags |= MSG_TRUNC;
515 copied = len;
516 }
517 err = skb_copy_datagram_msg(skb, 0, msg, copied);
518 if (unlikely(err)) {
519 kfree_skb(skb);
520 return err;
521 }
522 sock_recv_timestamp(msg, sk, skb);
523
524 serr = SKB_EXT_ERR(skb);
525
526 if (sin && ipv4_datagram_support_addr(serr)) {
527 sin->sin_family = AF_INET;
528 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) +
529 serr->addr_offset);
530 sin->sin_port = serr->port;
531 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
532 *addr_len = sizeof(*sin);
533 }
534
535 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
536 sin = &errhdr.offender;
537 memset(sin, 0, sizeof(*sin));
538
539 if (ipv4_datagram_support_cmsg(sk, skb, serr->ee.ee_origin)) {
540 sin->sin_family = AF_INET;
541 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
542 if (inet_sk(sk)->cmsg_flags)
543 ip_cmsg_recv(msg, skb);
544 }
545
546 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
547
548 /* Now we could try to dump offended packet options */
549
550 msg->msg_flags |= MSG_ERRQUEUE;
551 err = copied;
552
553 consume_skb(skb);
554 out:
555 return err;
556 }
557
558
559 /*
560 * Socket option code for IP. This is the end of the line after any
561 * TCP,UDP etc options on an IP socket.
562 */
563 static bool setsockopt_needs_rtnl(int optname)
564 {
565 switch (optname) {
566 case IP_ADD_MEMBERSHIP:
567 case IP_ADD_SOURCE_MEMBERSHIP:
568 case IP_BLOCK_SOURCE:
569 case IP_DROP_MEMBERSHIP:
570 case IP_DROP_SOURCE_MEMBERSHIP:
571 case IP_MSFILTER:
572 case IP_UNBLOCK_SOURCE:
573 case MCAST_BLOCK_SOURCE:
574 case MCAST_MSFILTER:
575 case MCAST_JOIN_GROUP:
576 case MCAST_JOIN_SOURCE_GROUP:
577 case MCAST_LEAVE_GROUP:
578 case MCAST_LEAVE_SOURCE_GROUP:
579 case MCAST_UNBLOCK_SOURCE:
580 return true;
581 }
582 return false;
583 }
584
585 static int do_ip_setsockopt(struct sock *sk, int level,
586 int optname, char __user *optval, unsigned int optlen)
587 {
588 struct inet_sock *inet = inet_sk(sk);
589 struct net *net = sock_net(sk);
590 int val = 0, err;
591 bool needs_rtnl = setsockopt_needs_rtnl(optname);
592
593 switch (optname) {
594 case IP_PKTINFO:
595 case IP_RECVTTL:
596 case IP_RECVOPTS:
597 case IP_RECVTOS:
598 case IP_RETOPTS:
599 case IP_TOS:
600 case IP_TTL:
601 case IP_HDRINCL:
602 case IP_MTU_DISCOVER:
603 case IP_RECVERR:
604 case IP_ROUTER_ALERT:
605 case IP_FREEBIND:
606 case IP_PASSSEC:
607 case IP_TRANSPARENT:
608 case IP_MINTTL:
609 case IP_NODEFRAG:
610 case IP_BIND_ADDRESS_NO_PORT:
611 case IP_UNICAST_IF:
612 case IP_MULTICAST_TTL:
613 case IP_MULTICAST_ALL:
614 case IP_MULTICAST_LOOP:
615 case IP_RECVORIGDSTADDR:
616 case IP_CHECKSUM:
617 if (optlen >= sizeof(int)) {
618 if (get_user(val, (int __user *) optval))
619 return -EFAULT;
620 } else if (optlen >= sizeof(char)) {
621 unsigned char ucval;
622
623 if (get_user(ucval, (unsigned char __user *) optval))
624 return -EFAULT;
625 val = (int) ucval;
626 }
627 }
628
629 /* If optlen==0, it is equivalent to val == 0 */
630
631 if (ip_mroute_opt(optname))
632 return ip_mroute_setsockopt(sk, optname, optval, optlen);
633
634 err = 0;
635 if (needs_rtnl)
636 rtnl_lock();
637 lock_sock(sk);
638
639 switch (optname) {
640 case IP_OPTIONS:
641 {
642 struct ip_options_rcu *old, *opt = NULL;
643
644 if (optlen > 40)
645 goto e_inval;
646 err = ip_options_get_from_user(sock_net(sk), &opt,
647 optval, optlen);
648 if (err)
649 break;
650 old = rcu_dereference_protected(inet->inet_opt,
651 lockdep_sock_is_held(sk));
652 if (inet->is_icsk) {
653 struct inet_connection_sock *icsk = inet_csk(sk);
654 #if IS_ENABLED(CONFIG_IPV6)
655 if (sk->sk_family == PF_INET ||
656 (!((1 << sk->sk_state) &
657 (TCPF_LISTEN | TCPF_CLOSE)) &&
658 inet->inet_daddr != LOOPBACK4_IPV6)) {
659 #endif
660 if (old)
661 icsk->icsk_ext_hdr_len -= old->opt.optlen;
662 if (opt)
663 icsk->icsk_ext_hdr_len += opt->opt.optlen;
664 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
665 #if IS_ENABLED(CONFIG_IPV6)
666 }
667 #endif
668 }
669 rcu_assign_pointer(inet->inet_opt, opt);
670 if (old)
671 kfree_rcu(old, rcu);
672 break;
673 }
674 case IP_PKTINFO:
675 if (val)
676 inet->cmsg_flags |= IP_CMSG_PKTINFO;
677 else
678 inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
679 break;
680 case IP_RECVTTL:
681 if (val)
682 inet->cmsg_flags |= IP_CMSG_TTL;
683 else
684 inet->cmsg_flags &= ~IP_CMSG_TTL;
685 break;
686 case IP_RECVTOS:
687 if (val)
688 inet->cmsg_flags |= IP_CMSG_TOS;
689 else
690 inet->cmsg_flags &= ~IP_CMSG_TOS;
691 break;
692 case IP_RECVOPTS:
693 if (val)
694 inet->cmsg_flags |= IP_CMSG_RECVOPTS;
695 else
696 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
697 break;
698 case IP_RETOPTS:
699 if (val)
700 inet->cmsg_flags |= IP_CMSG_RETOPTS;
701 else
702 inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
703 break;
704 case IP_PASSSEC:
705 if (val)
706 inet->cmsg_flags |= IP_CMSG_PASSSEC;
707 else
708 inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
709 break;
710 case IP_RECVORIGDSTADDR:
711 if (val)
712 inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR;
713 else
714 inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR;
715 break;
716 case IP_CHECKSUM:
717 if (val) {
718 if (!(inet->cmsg_flags & IP_CMSG_CHECKSUM)) {
719 inet_inc_convert_csum(sk);
720 inet->cmsg_flags |= IP_CMSG_CHECKSUM;
721 }
722 } else {
723 if (inet->cmsg_flags & IP_CMSG_CHECKSUM) {
724 inet_dec_convert_csum(sk);
725 inet->cmsg_flags &= ~IP_CMSG_CHECKSUM;
726 }
727 }
728 break;
729 case IP_TOS: /* This sets both TOS and Precedence */
730 if (sk->sk_type == SOCK_STREAM) {
731 val &= ~INET_ECN_MASK;
732 val |= inet->tos & INET_ECN_MASK;
733 }
734 if (inet->tos != val) {
735 inet->tos = val;
736 sk->sk_priority = rt_tos2priority(val);
737 sk_dst_reset(sk);
738 }
739 break;
740 case IP_TTL:
741 if (optlen < 1)
742 goto e_inval;
743 if (val != -1 && (val < 1 || val > 255))
744 goto e_inval;
745 inet->uc_ttl = val;
746 break;
747 case IP_HDRINCL:
748 if (sk->sk_type != SOCK_RAW) {
749 err = -ENOPROTOOPT;
750 break;
751 }
752 inet->hdrincl = val ? 1 : 0;
753 break;
754 case IP_NODEFRAG:
755 if (sk->sk_type != SOCK_RAW) {
756 err = -ENOPROTOOPT;
757 break;
758 }
759 inet->nodefrag = val ? 1 : 0;
760 break;
761 case IP_BIND_ADDRESS_NO_PORT:
762 inet->bind_address_no_port = val ? 1 : 0;
763 break;
764 case IP_MTU_DISCOVER:
765 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_OMIT)
766 goto e_inval;
767 inet->pmtudisc = val;
768 break;
769 case IP_RECVERR:
770 inet->recverr = !!val;
771 if (!val)
772 skb_queue_purge(&sk->sk_error_queue);
773 break;
774 case IP_MULTICAST_TTL:
775 if (sk->sk_type == SOCK_STREAM)
776 goto e_inval;
777 if (optlen < 1)
778 goto e_inval;
779 if (val == -1)
780 val = 1;
781 if (val < 0 || val > 255)
782 goto e_inval;
783 inet->mc_ttl = val;
784 break;
785 case IP_MULTICAST_LOOP:
786 if (optlen < 1)
787 goto e_inval;
788 inet->mc_loop = !!val;
789 break;
790 case IP_UNICAST_IF:
791 {
792 struct net_device *dev = NULL;
793 int ifindex;
794
795 if (optlen != sizeof(int))
796 goto e_inval;
797
798 ifindex = (__force int)ntohl((__force __be32)val);
799 if (ifindex == 0) {
800 inet->uc_index = 0;
801 err = 0;
802 break;
803 }
804
805 dev = dev_get_by_index(sock_net(sk), ifindex);
806 err = -EADDRNOTAVAIL;
807 if (!dev)
808 break;
809 dev_put(dev);
810
811 err = -EINVAL;
812 if (sk->sk_bound_dev_if)
813 break;
814
815 inet->uc_index = ifindex;
816 err = 0;
817 break;
818 }
819 case IP_MULTICAST_IF:
820 {
821 struct ip_mreqn mreq;
822 struct net_device *dev = NULL;
823
824 if (sk->sk_type == SOCK_STREAM)
825 goto e_inval;
826 /*
827 * Check the arguments are allowable
828 */
829
830 if (optlen < sizeof(struct in_addr))
831 goto e_inval;
832
833 err = -EFAULT;
834 if (optlen >= sizeof(struct ip_mreqn)) {
835 if (copy_from_user(&mreq, optval, sizeof(mreq)))
836 break;
837 } else {
838 memset(&mreq, 0, sizeof(mreq));
839 if (optlen >= sizeof(struct ip_mreq)) {
840 if (copy_from_user(&mreq, optval,
841 sizeof(struct ip_mreq)))
842 break;
843 } else if (optlen >= sizeof(struct in_addr)) {
844 if (copy_from_user(&mreq.imr_address, optval,
845 sizeof(struct in_addr)))
846 break;
847 }
848 }
849
850 if (!mreq.imr_ifindex) {
851 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) {
852 inet->mc_index = 0;
853 inet->mc_addr = 0;
854 err = 0;
855 break;
856 }
857 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr);
858 if (dev)
859 mreq.imr_ifindex = dev->ifindex;
860 } else
861 dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex);
862
863
864 err = -EADDRNOTAVAIL;
865 if (!dev)
866 break;
867 dev_put(dev);
868
869 err = -EINVAL;
870 if (sk->sk_bound_dev_if &&
871 mreq.imr_ifindex != sk->sk_bound_dev_if)
872 break;
873
874 inet->mc_index = mreq.imr_ifindex;
875 inet->mc_addr = mreq.imr_address.s_addr;
876 err = 0;
877 break;
878 }
879
880 case IP_ADD_MEMBERSHIP:
881 case IP_DROP_MEMBERSHIP:
882 {
883 struct ip_mreqn mreq;
884
885 err = -EPROTO;
886 if (inet_sk(sk)->is_icsk)
887 break;
888
889 if (optlen < sizeof(struct ip_mreq))
890 goto e_inval;
891 err = -EFAULT;
892 if (optlen >= sizeof(struct ip_mreqn)) {
893 if (copy_from_user(&mreq, optval, sizeof(mreq)))
894 break;
895 } else {
896 memset(&mreq, 0, sizeof(mreq));
897 if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq)))
898 break;
899 }
900
901 if (optname == IP_ADD_MEMBERSHIP)
902 err = ip_mc_join_group(sk, &mreq);
903 else
904 err = ip_mc_leave_group(sk, &mreq);
905 break;
906 }
907 case IP_MSFILTER:
908 {
909 struct ip_msfilter *msf;
910
911 if (optlen < IP_MSFILTER_SIZE(0))
912 goto e_inval;
913 if (optlen > sysctl_optmem_max) {
914 err = -ENOBUFS;
915 break;
916 }
917 msf = kmalloc(optlen, GFP_KERNEL);
918 if (!msf) {
919 err = -ENOBUFS;
920 break;
921 }
922 err = -EFAULT;
923 if (copy_from_user(msf, optval, optlen)) {
924 kfree(msf);
925 break;
926 }
927 /* numsrc >= (1G-4) overflow in 32 bits */
928 if (msf->imsf_numsrc >= 0x3ffffffcU ||
929 msf->imsf_numsrc > net->ipv4.sysctl_igmp_max_msf) {
930 kfree(msf);
931 err = -ENOBUFS;
932 break;
933 }
934 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
935 kfree(msf);
936 err = -EINVAL;
937 break;
938 }
939 err = ip_mc_msfilter(sk, msf, 0);
940 kfree(msf);
941 break;
942 }
943 case IP_BLOCK_SOURCE:
944 case IP_UNBLOCK_SOURCE:
945 case IP_ADD_SOURCE_MEMBERSHIP:
946 case IP_DROP_SOURCE_MEMBERSHIP:
947 {
948 struct ip_mreq_source mreqs;
949 int omode, add;
950
951 if (optlen != sizeof(struct ip_mreq_source))
952 goto e_inval;
953 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
954 err = -EFAULT;
955 break;
956 }
957 if (optname == IP_BLOCK_SOURCE) {
958 omode = MCAST_EXCLUDE;
959 add = 1;
960 } else if (optname == IP_UNBLOCK_SOURCE) {
961 omode = MCAST_EXCLUDE;
962 add = 0;
963 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
964 struct ip_mreqn mreq;
965
966 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
967 mreq.imr_address.s_addr = mreqs.imr_interface;
968 mreq.imr_ifindex = 0;
969 err = ip_mc_join_group(sk, &mreq);
970 if (err && err != -EADDRINUSE)
971 break;
972 omode = MCAST_INCLUDE;
973 add = 1;
974 } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
975 omode = MCAST_INCLUDE;
976 add = 0;
977 }
978 err = ip_mc_source(add, omode, sk, &mreqs, 0);
979 break;
980 }
981 case MCAST_JOIN_GROUP:
982 case MCAST_LEAVE_GROUP:
983 {
984 struct group_req greq;
985 struct sockaddr_in *psin;
986 struct ip_mreqn mreq;
987
988 if (optlen < sizeof(struct group_req))
989 goto e_inval;
990 err = -EFAULT;
991 if (copy_from_user(&greq, optval, sizeof(greq)))
992 break;
993 psin = (struct sockaddr_in *)&greq.gr_group;
994 if (psin->sin_family != AF_INET)
995 goto e_inval;
996 memset(&mreq, 0, sizeof(mreq));
997 mreq.imr_multiaddr = psin->sin_addr;
998 mreq.imr_ifindex = greq.gr_interface;
999
1000 if (optname == MCAST_JOIN_GROUP)
1001 err = ip_mc_join_group(sk, &mreq);
1002 else
1003 err = ip_mc_leave_group(sk, &mreq);
1004 break;
1005 }
1006 case MCAST_JOIN_SOURCE_GROUP:
1007 case MCAST_LEAVE_SOURCE_GROUP:
1008 case MCAST_BLOCK_SOURCE:
1009 case MCAST_UNBLOCK_SOURCE:
1010 {
1011 struct group_source_req greqs;
1012 struct ip_mreq_source mreqs;
1013 struct sockaddr_in *psin;
1014 int omode, add;
1015
1016 if (optlen != sizeof(struct group_source_req))
1017 goto e_inval;
1018 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
1019 err = -EFAULT;
1020 break;
1021 }
1022 if (greqs.gsr_group.ss_family != AF_INET ||
1023 greqs.gsr_source.ss_family != AF_INET) {
1024 err = -EADDRNOTAVAIL;
1025 break;
1026 }
1027 psin = (struct sockaddr_in *)&greqs.gsr_group;
1028 mreqs.imr_multiaddr = psin->sin_addr.s_addr;
1029 psin = (struct sockaddr_in *)&greqs.gsr_source;
1030 mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
1031 mreqs.imr_interface = 0; /* use index for mc_source */
1032
1033 if (optname == MCAST_BLOCK_SOURCE) {
1034 omode = MCAST_EXCLUDE;
1035 add = 1;
1036 } else if (optname == MCAST_UNBLOCK_SOURCE) {
1037 omode = MCAST_EXCLUDE;
1038 add = 0;
1039 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
1040 struct ip_mreqn mreq;
1041
1042 psin = (struct sockaddr_in *)&greqs.gsr_group;
1043 mreq.imr_multiaddr = psin->sin_addr;
1044 mreq.imr_address.s_addr = 0;
1045 mreq.imr_ifindex = greqs.gsr_interface;
1046 err = ip_mc_join_group(sk, &mreq);
1047 if (err && err != -EADDRINUSE)
1048 break;
1049 greqs.gsr_interface = mreq.imr_ifindex;
1050 omode = MCAST_INCLUDE;
1051 add = 1;
1052 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
1053 omode = MCAST_INCLUDE;
1054 add = 0;
1055 }
1056 err = ip_mc_source(add, omode, sk, &mreqs,
1057 greqs.gsr_interface);
1058 break;
1059 }
1060 case MCAST_MSFILTER:
1061 {
1062 struct sockaddr_in *psin;
1063 struct ip_msfilter *msf = NULL;
1064 struct group_filter *gsf = NULL;
1065 int msize, i, ifindex;
1066
1067 if (optlen < GROUP_FILTER_SIZE(0))
1068 goto e_inval;
1069 if (optlen > sysctl_optmem_max) {
1070 err = -ENOBUFS;
1071 break;
1072 }
1073 gsf = kmalloc(optlen, GFP_KERNEL);
1074 if (!gsf) {
1075 err = -ENOBUFS;
1076 break;
1077 }
1078 err = -EFAULT;
1079 if (copy_from_user(gsf, optval, optlen))
1080 goto mc_msf_out;
1081
1082 /* numsrc >= (4G-140)/128 overflow in 32 bits */
1083 if (gsf->gf_numsrc >= 0x1ffffff ||
1084 gsf->gf_numsrc > net->ipv4.sysctl_igmp_max_msf) {
1085 err = -ENOBUFS;
1086 goto mc_msf_out;
1087 }
1088 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
1089 err = -EINVAL;
1090 goto mc_msf_out;
1091 }
1092 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
1093 msf = kmalloc(msize, GFP_KERNEL);
1094 if (!msf) {
1095 err = -ENOBUFS;
1096 goto mc_msf_out;
1097 }
1098 ifindex = gsf->gf_interface;
1099 psin = (struct sockaddr_in *)&gsf->gf_group;
1100 if (psin->sin_family != AF_INET) {
1101 err = -EADDRNOTAVAIL;
1102 goto mc_msf_out;
1103 }
1104 msf->imsf_multiaddr = psin->sin_addr.s_addr;
1105 msf->imsf_interface = 0;
1106 msf->imsf_fmode = gsf->gf_fmode;
1107 msf->imsf_numsrc = gsf->gf_numsrc;
1108 err = -EADDRNOTAVAIL;
1109 for (i = 0; i < gsf->gf_numsrc; ++i) {
1110 psin = (struct sockaddr_in *)&gsf->gf_slist[i];
1111
1112 if (psin->sin_family != AF_INET)
1113 goto mc_msf_out;
1114 msf->imsf_slist[i] = psin->sin_addr.s_addr;
1115 }
1116 kfree(gsf);
1117 gsf = NULL;
1118
1119 err = ip_mc_msfilter(sk, msf, ifindex);
1120 mc_msf_out:
1121 kfree(msf);
1122 kfree(gsf);
1123 break;
1124 }
1125 case IP_MULTICAST_ALL:
1126 if (optlen < 1)
1127 goto e_inval;
1128 if (val != 0 && val != 1)
1129 goto e_inval;
1130 inet->mc_all = val;
1131 break;
1132 case IP_ROUTER_ALERT:
1133 err = ip_ra_control(sk, val ? 1 : 0, NULL);
1134 break;
1135
1136 case IP_FREEBIND:
1137 if (optlen < 1)
1138 goto e_inval;
1139 inet->freebind = !!val;
1140 break;
1141
1142 case IP_IPSEC_POLICY:
1143 case IP_XFRM_POLICY:
1144 err = -EPERM;
1145 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1146 break;
1147 err = xfrm_user_policy(sk, optname, optval, optlen);
1148 break;
1149
1150 case IP_TRANSPARENT:
1151 if (!!val && !ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) &&
1152 !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
1153 err = -EPERM;
1154 break;
1155 }
1156 if (optlen < 1)
1157 goto e_inval;
1158 inet->transparent = !!val;
1159 break;
1160
1161 case IP_MINTTL:
1162 if (optlen < 1)
1163 goto e_inval;
1164 if (val < 0 || val > 255)
1165 goto e_inval;
1166 inet->min_ttl = val;
1167 break;
1168
1169 default:
1170 err = -ENOPROTOOPT;
1171 break;
1172 }
1173 release_sock(sk);
1174 if (needs_rtnl)
1175 rtnl_unlock();
1176 return err;
1177
1178 e_inval:
1179 release_sock(sk);
1180 if (needs_rtnl)
1181 rtnl_unlock();
1182 return -EINVAL;
1183 }
1184
1185 /**
1186 * ipv4_pktinfo_prepare - transfer some info from rtable to skb
1187 * @sk: socket
1188 * @skb: buffer
1189 *
1190 * To support IP_CMSG_PKTINFO option, we store rt_iif and specific
1191 * destination in skb->cb[] before dst drop.
1192 * This way, receiver doesn't make cache line misses to read rtable.
1193 */
1194 void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb)
1195 {
1196 struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb);
1197 bool prepare = (inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) ||
1198 ipv6_sk_rxinfo(sk);
1199
1200 if (prepare && skb_rtable(skb)) {
1201 /* skb->cb is overloaded: prior to this point it is IP{6}CB
1202 * which has interface index (iif) as the first member of the
1203 * underlying inet{6}_skb_parm struct. This code then overlays
1204 * PKTINFO_SKB_CB and in_pktinfo also has iif as the first
1205 * element so the iif is picked up from the prior IPCB
1206 */
1207 pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb);
1208 } else {
1209 pktinfo->ipi_ifindex = 0;
1210 pktinfo->ipi_spec_dst.s_addr = 0;
1211 }
1212 skb_dst_drop(skb);
1213 }
1214
1215 int ip_setsockopt(struct sock *sk, int level,
1216 int optname, char __user *optval, unsigned int optlen)
1217 {
1218 int err;
1219
1220 if (level != SOL_IP)
1221 return -ENOPROTOOPT;
1222
1223 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1224 #ifdef CONFIG_NETFILTER
1225 /* we need to exclude all possible ENOPROTOOPTs except default case */
1226 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
1227 optname != IP_IPSEC_POLICY &&
1228 optname != IP_XFRM_POLICY &&
1229 !ip_mroute_opt(optname)) {
1230 lock_sock(sk);
1231 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
1232 release_sock(sk);
1233 }
1234 #endif
1235 return err;
1236 }
1237 EXPORT_SYMBOL(ip_setsockopt);
1238
1239 #ifdef CONFIG_COMPAT
1240 int compat_ip_setsockopt(struct sock *sk, int level, int optname,
1241 char __user *optval, unsigned int optlen)
1242 {
1243 int err;
1244
1245 if (level != SOL_IP)
1246 return -ENOPROTOOPT;
1247
1248 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
1249 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
1250 ip_setsockopt);
1251
1252 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1253 #ifdef CONFIG_NETFILTER
1254 /* we need to exclude all possible ENOPROTOOPTs except default case */
1255 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
1256 optname != IP_IPSEC_POLICY &&
1257 optname != IP_XFRM_POLICY &&
1258 !ip_mroute_opt(optname)) {
1259 lock_sock(sk);
1260 err = compat_nf_setsockopt(sk, PF_INET, optname,
1261 optval, optlen);
1262 release_sock(sk);
1263 }
1264 #endif
1265 return err;
1266 }
1267 EXPORT_SYMBOL(compat_ip_setsockopt);
1268 #endif
1269
1270 /*
1271 * Get the options. Note for future reference. The GET of IP options gets
1272 * the _received_ ones. The set sets the _sent_ ones.
1273 */
1274
1275 static bool getsockopt_needs_rtnl(int optname)
1276 {
1277 switch (optname) {
1278 case IP_MSFILTER:
1279 case MCAST_MSFILTER:
1280 return true;
1281 }
1282 return false;
1283 }
1284
1285 static int do_ip_getsockopt(struct sock *sk, int level, int optname,
1286 char __user *optval, int __user *optlen, unsigned int flags)
1287 {
1288 struct inet_sock *inet = inet_sk(sk);
1289 bool needs_rtnl = getsockopt_needs_rtnl(optname);
1290 int val, err = 0;
1291 int len;
1292
1293 if (level != SOL_IP)
1294 return -EOPNOTSUPP;
1295
1296 if (ip_mroute_opt(optname))
1297 return ip_mroute_getsockopt(sk, optname, optval, optlen);
1298
1299 if (get_user(len, optlen))
1300 return -EFAULT;
1301 if (len < 0)
1302 return -EINVAL;
1303
1304 if (needs_rtnl)
1305 rtnl_lock();
1306 lock_sock(sk);
1307
1308 switch (optname) {
1309 case IP_OPTIONS:
1310 {
1311 unsigned char optbuf[sizeof(struct ip_options)+40];
1312 struct ip_options *opt = (struct ip_options *)optbuf;
1313 struct ip_options_rcu *inet_opt;
1314
1315 inet_opt = rcu_dereference_protected(inet->inet_opt,
1316 lockdep_sock_is_held(sk));
1317 opt->optlen = 0;
1318 if (inet_opt)
1319 memcpy(optbuf, &inet_opt->opt,
1320 sizeof(struct ip_options) +
1321 inet_opt->opt.optlen);
1322 release_sock(sk);
1323
1324 if (opt->optlen == 0)
1325 return put_user(0, optlen);
1326
1327 ip_options_undo(opt);
1328
1329 len = min_t(unsigned int, len, opt->optlen);
1330 if (put_user(len, optlen))
1331 return -EFAULT;
1332 if (copy_to_user(optval, opt->__data, len))
1333 return -EFAULT;
1334 return 0;
1335 }
1336 case IP_PKTINFO:
1337 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
1338 break;
1339 case IP_RECVTTL:
1340 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
1341 break;
1342 case IP_RECVTOS:
1343 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
1344 break;
1345 case IP_RECVOPTS:
1346 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
1347 break;
1348 case IP_RETOPTS:
1349 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
1350 break;
1351 case IP_PASSSEC:
1352 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
1353 break;
1354 case IP_RECVORIGDSTADDR:
1355 val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0;
1356 break;
1357 case IP_CHECKSUM:
1358 val = (inet->cmsg_flags & IP_CMSG_CHECKSUM) != 0;
1359 break;
1360 case IP_TOS:
1361 val = inet->tos;
1362 break;
1363 case IP_TTL:
1364 {
1365 struct net *net = sock_net(sk);
1366 val = (inet->uc_ttl == -1 ?
1367 net->ipv4.sysctl_ip_default_ttl :
1368 inet->uc_ttl);
1369 break;
1370 }
1371 case IP_HDRINCL:
1372 val = inet->hdrincl;
1373 break;
1374 case IP_NODEFRAG:
1375 val = inet->nodefrag;
1376 break;
1377 case IP_BIND_ADDRESS_NO_PORT:
1378 val = inet->bind_address_no_port;
1379 break;
1380 case IP_MTU_DISCOVER:
1381 val = inet->pmtudisc;
1382 break;
1383 case IP_MTU:
1384 {
1385 struct dst_entry *dst;
1386 val = 0;
1387 dst = sk_dst_get(sk);
1388 if (dst) {
1389 val = dst_mtu(dst);
1390 dst_release(dst);
1391 }
1392 if (!val) {
1393 release_sock(sk);
1394 return -ENOTCONN;
1395 }
1396 break;
1397 }
1398 case IP_RECVERR:
1399 val = inet->recverr;
1400 break;
1401 case IP_MULTICAST_TTL:
1402 val = inet->mc_ttl;
1403 break;
1404 case IP_MULTICAST_LOOP:
1405 val = inet->mc_loop;
1406 break;
1407 case IP_UNICAST_IF:
1408 val = (__force int)htonl((__u32) inet->uc_index);
1409 break;
1410 case IP_MULTICAST_IF:
1411 {
1412 struct in_addr addr;
1413 len = min_t(unsigned int, len, sizeof(struct in_addr));
1414 addr.s_addr = inet->mc_addr;
1415 release_sock(sk);
1416
1417 if (put_user(len, optlen))
1418 return -EFAULT;
1419 if (copy_to_user(optval, &addr, len))
1420 return -EFAULT;
1421 return 0;
1422 }
1423 case IP_MSFILTER:
1424 {
1425 struct ip_msfilter msf;
1426
1427 if (len < IP_MSFILTER_SIZE(0)) {
1428 err = -EINVAL;
1429 goto out;
1430 }
1431 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
1432 err = -EFAULT;
1433 goto out;
1434 }
1435 err = ip_mc_msfget(sk, &msf,
1436 (struct ip_msfilter __user *)optval, optlen);
1437 goto out;
1438 }
1439 case MCAST_MSFILTER:
1440 {
1441 struct group_filter gsf;
1442
1443 if (len < GROUP_FILTER_SIZE(0)) {
1444 err = -EINVAL;
1445 goto out;
1446 }
1447 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
1448 err = -EFAULT;
1449 goto out;
1450 }
1451 err = ip_mc_gsfget(sk, &gsf,
1452 (struct group_filter __user *)optval,
1453 optlen);
1454 goto out;
1455 }
1456 case IP_MULTICAST_ALL:
1457 val = inet->mc_all;
1458 break;
1459 case IP_PKTOPTIONS:
1460 {
1461 struct msghdr msg;
1462
1463 release_sock(sk);
1464
1465 if (sk->sk_type != SOCK_STREAM)
1466 return -ENOPROTOOPT;
1467
1468 msg.msg_control = (__force void *) optval;
1469 msg.msg_controllen = len;
1470 msg.msg_flags = flags;
1471
1472 if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
1473 struct in_pktinfo info;
1474
1475 info.ipi_addr.s_addr = inet->inet_rcv_saddr;
1476 info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr;
1477 info.ipi_ifindex = inet->mc_index;
1478 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
1479 }
1480 if (inet->cmsg_flags & IP_CMSG_TTL) {
1481 int hlim = inet->mc_ttl;
1482 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
1483 }
1484 if (inet->cmsg_flags & IP_CMSG_TOS) {
1485 int tos = inet->rcv_tos;
1486 put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos);
1487 }
1488 len -= msg.msg_controllen;
1489 return put_user(len, optlen);
1490 }
1491 case IP_FREEBIND:
1492 val = inet->freebind;
1493 break;
1494 case IP_TRANSPARENT:
1495 val = inet->transparent;
1496 break;
1497 case IP_MINTTL:
1498 val = inet->min_ttl;
1499 break;
1500 default:
1501 release_sock(sk);
1502 return -ENOPROTOOPT;
1503 }
1504 release_sock(sk);
1505
1506 if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) {
1507 unsigned char ucval = (unsigned char)val;
1508 len = 1;
1509 if (put_user(len, optlen))
1510 return -EFAULT;
1511 if (copy_to_user(optval, &ucval, 1))
1512 return -EFAULT;
1513 } else {
1514 len = min_t(unsigned int, sizeof(int), len);
1515 if (put_user(len, optlen))
1516 return -EFAULT;
1517 if (copy_to_user(optval, &val, len))
1518 return -EFAULT;
1519 }
1520 return 0;
1521
1522 out:
1523 release_sock(sk);
1524 if (needs_rtnl)
1525 rtnl_unlock();
1526 return err;
1527 }
1528
1529 int ip_getsockopt(struct sock *sk, int level,
1530 int optname, char __user *optval, int __user *optlen)
1531 {
1532 int err;
1533
1534 err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0);
1535 #ifdef CONFIG_NETFILTER
1536 /* we need to exclude all possible ENOPROTOOPTs except default case */
1537 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1538 !ip_mroute_opt(optname)) {
1539 int len;
1540
1541 if (get_user(len, optlen))
1542 return -EFAULT;
1543
1544 lock_sock(sk);
1545 err = nf_getsockopt(sk, PF_INET, optname, optval,
1546 &len);
1547 release_sock(sk);
1548 if (err >= 0)
1549 err = put_user(len, optlen);
1550 return err;
1551 }
1552 #endif
1553 return err;
1554 }
1555 EXPORT_SYMBOL(ip_getsockopt);
1556
1557 #ifdef CONFIG_COMPAT
1558 int compat_ip_getsockopt(struct sock *sk, int level, int optname,
1559 char __user *optval, int __user *optlen)
1560 {
1561 int err;
1562
1563 if (optname == MCAST_MSFILTER)
1564 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1565 ip_getsockopt);
1566
1567 err = do_ip_getsockopt(sk, level, optname, optval, optlen,
1568 MSG_CMSG_COMPAT);
1569
1570 #ifdef CONFIG_NETFILTER
1571 /* we need to exclude all possible ENOPROTOOPTs except default case */
1572 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1573 !ip_mroute_opt(optname)) {
1574 int len;
1575
1576 if (get_user(len, optlen))
1577 return -EFAULT;
1578
1579 lock_sock(sk);
1580 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
1581 release_sock(sk);
1582 if (err >= 0)
1583 err = put_user(len, optlen);
1584 return err;
1585 }
1586 #endif
1587 return err;
1588 }
1589 EXPORT_SYMBOL(compat_ip_getsockopt);
1590 #endif
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