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[mirror_ubuntu-artful-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 <linux/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_fragsize(struct msghdr *msg, struct sk_buff *skb)
101 {
102 int val;
103
104 if (IPCB(skb)->frag_max_size == 0)
105 return;
106
107 val = IPCB(skb)->frag_max_size;
108 put_cmsg(msg, SOL_IP, IP_RECVFRAGSIZE, sizeof(val), &val);
109 }
110
111 static void ip_cmsg_recv_checksum(struct msghdr *msg, struct sk_buff *skb,
112 int tlen, int offset)
113 {
114 __wsum csum = skb->csum;
115
116 if (skb->ip_summed != CHECKSUM_COMPLETE)
117 return;
118
119 if (offset != 0) {
120 int tend_off = skb_transport_offset(skb) + tlen;
121 csum = csum_sub(csum, skb_checksum(skb, tend_off, offset, 0));
122 }
123
124 put_cmsg(msg, SOL_IP, IP_CHECKSUM, sizeof(__wsum), &csum);
125 }
126
127 static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
128 {
129 char *secdata;
130 u32 seclen, secid;
131 int err;
132
133 err = security_socket_getpeersec_dgram(NULL, skb, &secid);
134 if (err)
135 return;
136
137 err = security_secid_to_secctx(secid, &secdata, &seclen);
138 if (err)
139 return;
140
141 put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata);
142 security_release_secctx(secdata, seclen);
143 }
144
145 static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb)
146 {
147 struct sockaddr_in sin;
148 const struct iphdr *iph = ip_hdr(skb);
149 __be16 *ports = (__be16 *)skb_transport_header(skb);
150
151 if (skb_transport_offset(skb) + 4 > (int)skb->len)
152 return;
153
154 /* All current transport protocols have the port numbers in the
155 * first four bytes of the transport header and this function is
156 * written with this assumption in mind.
157 */
158
159 sin.sin_family = AF_INET;
160 sin.sin_addr.s_addr = iph->daddr;
161 sin.sin_port = ports[1];
162 memset(sin.sin_zero, 0, sizeof(sin.sin_zero));
163
164 put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin);
165 }
166
167 void ip_cmsg_recv_offset(struct msghdr *msg, struct sock *sk,
168 struct sk_buff *skb, int tlen, int offset)
169 {
170 struct inet_sock *inet = inet_sk(sk);
171 unsigned int flags = inet->cmsg_flags;
172
173 /* Ordered by supposed usage frequency */
174 if (flags & IP_CMSG_PKTINFO) {
175 ip_cmsg_recv_pktinfo(msg, skb);
176
177 flags &= ~IP_CMSG_PKTINFO;
178 if (!flags)
179 return;
180 }
181
182 if (flags & IP_CMSG_TTL) {
183 ip_cmsg_recv_ttl(msg, skb);
184
185 flags &= ~IP_CMSG_TTL;
186 if (!flags)
187 return;
188 }
189
190 if (flags & IP_CMSG_TOS) {
191 ip_cmsg_recv_tos(msg, skb);
192
193 flags &= ~IP_CMSG_TOS;
194 if (!flags)
195 return;
196 }
197
198 if (flags & IP_CMSG_RECVOPTS) {
199 ip_cmsg_recv_opts(msg, skb);
200
201 flags &= ~IP_CMSG_RECVOPTS;
202 if (!flags)
203 return;
204 }
205
206 if (flags & IP_CMSG_RETOPTS) {
207 ip_cmsg_recv_retopts(msg, skb);
208
209 flags &= ~IP_CMSG_RETOPTS;
210 if (!flags)
211 return;
212 }
213
214 if (flags & IP_CMSG_PASSSEC) {
215 ip_cmsg_recv_security(msg, skb);
216
217 flags &= ~IP_CMSG_PASSSEC;
218 if (!flags)
219 return;
220 }
221
222 if (flags & IP_CMSG_ORIGDSTADDR) {
223 ip_cmsg_recv_dstaddr(msg, skb);
224
225 flags &= ~IP_CMSG_ORIGDSTADDR;
226 if (!flags)
227 return;
228 }
229
230 if (flags & IP_CMSG_CHECKSUM)
231 ip_cmsg_recv_checksum(msg, skb, tlen, offset);
232
233 if (flags & IP_CMSG_RECVFRAGSIZE)
234 ip_cmsg_recv_fragsize(msg, skb);
235 }
236 EXPORT_SYMBOL(ip_cmsg_recv_offset);
237
238 int ip_cmsg_send(struct sock *sk, struct msghdr *msg, struct ipcm_cookie *ipc,
239 bool allow_ipv6)
240 {
241 int err, val;
242 struct cmsghdr *cmsg;
243 struct net *net = sock_net(sk);
244
245 for_each_cmsghdr(cmsg, msg) {
246 if (!CMSG_OK(msg, cmsg))
247 return -EINVAL;
248 #if IS_ENABLED(CONFIG_IPV6)
249 if (allow_ipv6 &&
250 cmsg->cmsg_level == SOL_IPV6 &&
251 cmsg->cmsg_type == IPV6_PKTINFO) {
252 struct in6_pktinfo *src_info;
253
254 if (cmsg->cmsg_len < CMSG_LEN(sizeof(*src_info)))
255 return -EINVAL;
256 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
257 if (!ipv6_addr_v4mapped(&src_info->ipi6_addr))
258 return -EINVAL;
259 ipc->oif = src_info->ipi6_ifindex;
260 ipc->addr = src_info->ipi6_addr.s6_addr32[3];
261 continue;
262 }
263 #endif
264 if (cmsg->cmsg_level == SOL_SOCKET) {
265 err = __sock_cmsg_send(sk, msg, cmsg, &ipc->sockc);
266 if (err)
267 return err;
268 continue;
269 }
270
271 if (cmsg->cmsg_level != SOL_IP)
272 continue;
273 switch (cmsg->cmsg_type) {
274 case IP_RETOPTS:
275 err = cmsg->cmsg_len - sizeof(struct cmsghdr);
276
277 /* Our caller is responsible for freeing ipc->opt */
278 err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg),
279 err < 40 ? err : 40);
280 if (err)
281 return err;
282 break;
283 case IP_PKTINFO:
284 {
285 struct in_pktinfo *info;
286 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
287 return -EINVAL;
288 info = (struct in_pktinfo *)CMSG_DATA(cmsg);
289 ipc->oif = info->ipi_ifindex;
290 ipc->addr = info->ipi_spec_dst.s_addr;
291 break;
292 }
293 case IP_TTL:
294 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
295 return -EINVAL;
296 val = *(int *)CMSG_DATA(cmsg);
297 if (val < 1 || val > 255)
298 return -EINVAL;
299 ipc->ttl = val;
300 break;
301 case IP_TOS:
302 if (cmsg->cmsg_len == CMSG_LEN(sizeof(int)))
303 val = *(int *)CMSG_DATA(cmsg);
304 else if (cmsg->cmsg_len == CMSG_LEN(sizeof(u8)))
305 val = *(u8 *)CMSG_DATA(cmsg);
306 else
307 return -EINVAL;
308 if (val < 0 || val > 255)
309 return -EINVAL;
310 ipc->tos = val;
311 ipc->priority = rt_tos2priority(ipc->tos);
312 break;
313
314 default:
315 return -EINVAL;
316 }
317 }
318 return 0;
319 }
320
321
322 /* Special input handler for packets caught by router alert option.
323 They are selected only by protocol field, and then processed likely
324 local ones; but only if someone wants them! Otherwise, router
325 not running rsvpd will kill RSVP.
326
327 It is user level problem, what it will make with them.
328 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
329 but receiver should be enough clever f.e. to forward mtrace requests,
330 sent to multicast group to reach destination designated router.
331 */
332 struct ip_ra_chain __rcu *ip_ra_chain;
333
334
335 static void ip_ra_destroy_rcu(struct rcu_head *head)
336 {
337 struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu);
338
339 sock_put(ra->saved_sk);
340 kfree(ra);
341 }
342
343 int ip_ra_control(struct sock *sk, unsigned char on,
344 void (*destructor)(struct sock *))
345 {
346 struct ip_ra_chain *ra, *new_ra;
347 struct ip_ra_chain __rcu **rap;
348
349 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW)
350 return -EINVAL;
351
352 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
353
354 for (rap = &ip_ra_chain;
355 (ra = rtnl_dereference(*rap)) != NULL;
356 rap = &ra->next) {
357 if (ra->sk == sk) {
358 if (on) {
359 kfree(new_ra);
360 return -EADDRINUSE;
361 }
362 /* dont let ip_call_ra_chain() use sk again */
363 ra->sk = NULL;
364 RCU_INIT_POINTER(*rap, ra->next);
365
366 if (ra->destructor)
367 ra->destructor(sk);
368 /*
369 * Delay sock_put(sk) and kfree(ra) after one rcu grace
370 * period. This guarantee ip_call_ra_chain() dont need
371 * to mess with socket refcounts.
372 */
373 ra->saved_sk = sk;
374 call_rcu(&ra->rcu, ip_ra_destroy_rcu);
375 return 0;
376 }
377 }
378 if (!new_ra)
379 return -ENOBUFS;
380 new_ra->sk = sk;
381 new_ra->destructor = destructor;
382
383 RCU_INIT_POINTER(new_ra->next, ra);
384 rcu_assign_pointer(*rap, new_ra);
385 sock_hold(sk);
386
387 return 0;
388 }
389
390 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
391 __be16 port, u32 info, u8 *payload)
392 {
393 struct sock_exterr_skb *serr;
394
395 skb = skb_clone(skb, GFP_ATOMIC);
396 if (!skb)
397 return;
398
399 serr = SKB_EXT_ERR(skb);
400 serr->ee.ee_errno = err;
401 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
402 serr->ee.ee_type = icmp_hdr(skb)->type;
403 serr->ee.ee_code = icmp_hdr(skb)->code;
404 serr->ee.ee_pad = 0;
405 serr->ee.ee_info = info;
406 serr->ee.ee_data = 0;
407 serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) -
408 skb_network_header(skb);
409 serr->port = port;
410
411 if (skb_pull(skb, payload - skb->data)) {
412 skb_reset_transport_header(skb);
413 if (sock_queue_err_skb(sk, skb) == 0)
414 return;
415 }
416 kfree_skb(skb);
417 }
418
419 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info)
420 {
421 struct inet_sock *inet = inet_sk(sk);
422 struct sock_exterr_skb *serr;
423 struct iphdr *iph;
424 struct sk_buff *skb;
425
426 if (!inet->recverr)
427 return;
428
429 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
430 if (!skb)
431 return;
432
433 skb_put(skb, sizeof(struct iphdr));
434 skb_reset_network_header(skb);
435 iph = ip_hdr(skb);
436 iph->daddr = daddr;
437
438 serr = SKB_EXT_ERR(skb);
439 serr->ee.ee_errno = err;
440 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
441 serr->ee.ee_type = 0;
442 serr->ee.ee_code = 0;
443 serr->ee.ee_pad = 0;
444 serr->ee.ee_info = info;
445 serr->ee.ee_data = 0;
446 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
447 serr->port = port;
448
449 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
450 skb_reset_transport_header(skb);
451
452 if (sock_queue_err_skb(sk, skb))
453 kfree_skb(skb);
454 }
455
456 /* For some errors we have valid addr_offset even with zero payload and
457 * zero port. Also, addr_offset should be supported if port is set.
458 */
459 static inline bool ipv4_datagram_support_addr(struct sock_exterr_skb *serr)
460 {
461 return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
462 serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port;
463 }
464
465 /* IPv4 supports cmsg on all imcp errors and some timestamps
466 *
467 * Timestamp code paths do not initialize the fields expected by cmsg:
468 * the PKTINFO fields in skb->cb[]. Fill those in here.
469 */
470 static bool ipv4_datagram_support_cmsg(const struct sock *sk,
471 struct sk_buff *skb,
472 int ee_origin)
473 {
474 struct in_pktinfo *info;
475
476 if (ee_origin == SO_EE_ORIGIN_ICMP)
477 return true;
478
479 if (ee_origin == SO_EE_ORIGIN_LOCAL)
480 return false;
481
482 /* Support IP_PKTINFO on tstamp packets if requested, to correlate
483 * timestamp with egress dev. Not possible for packets without iif
484 * or without payload (SOF_TIMESTAMPING_OPT_TSONLY).
485 */
486 info = PKTINFO_SKB_CB(skb);
487 if (!(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_CMSG) ||
488 !info->ipi_ifindex)
489 return false;
490
491 info->ipi_spec_dst.s_addr = ip_hdr(skb)->saddr;
492 return true;
493 }
494
495 /*
496 * Handle MSG_ERRQUEUE
497 */
498 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
499 {
500 struct sock_exterr_skb *serr;
501 struct sk_buff *skb;
502 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name);
503 struct {
504 struct sock_extended_err ee;
505 struct sockaddr_in offender;
506 } errhdr;
507 int err;
508 int copied;
509
510 WARN_ON_ONCE(sk->sk_family == AF_INET6);
511
512 err = -EAGAIN;
513 skb = sock_dequeue_err_skb(sk);
514 if (!skb)
515 goto out;
516
517 copied = skb->len;
518 if (copied > len) {
519 msg->msg_flags |= MSG_TRUNC;
520 copied = len;
521 }
522 err = skb_copy_datagram_msg(skb, 0, msg, copied);
523 if (unlikely(err)) {
524 kfree_skb(skb);
525 return err;
526 }
527 sock_recv_timestamp(msg, sk, skb);
528
529 serr = SKB_EXT_ERR(skb);
530
531 if (sin && ipv4_datagram_support_addr(serr)) {
532 sin->sin_family = AF_INET;
533 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) +
534 serr->addr_offset);
535 sin->sin_port = serr->port;
536 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
537 *addr_len = sizeof(*sin);
538 }
539
540 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
541 sin = &errhdr.offender;
542 memset(sin, 0, sizeof(*sin));
543
544 if (ipv4_datagram_support_cmsg(sk, skb, serr->ee.ee_origin)) {
545 sin->sin_family = AF_INET;
546 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
547 if (inet_sk(sk)->cmsg_flags)
548 ip_cmsg_recv(msg, skb);
549 }
550
551 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
552
553 /* Now we could try to dump offended packet options */
554
555 msg->msg_flags |= MSG_ERRQUEUE;
556 err = copied;
557
558 consume_skb(skb);
559 out:
560 return err;
561 }
562
563
564 /*
565 * Socket option code for IP. This is the end of the line after any
566 * TCP,UDP etc options on an IP socket.
567 */
568 static bool setsockopt_needs_rtnl(int optname)
569 {
570 switch (optname) {
571 case IP_ADD_MEMBERSHIP:
572 case IP_ADD_SOURCE_MEMBERSHIP:
573 case IP_BLOCK_SOURCE:
574 case IP_DROP_MEMBERSHIP:
575 case IP_DROP_SOURCE_MEMBERSHIP:
576 case IP_MSFILTER:
577 case IP_UNBLOCK_SOURCE:
578 case MCAST_BLOCK_SOURCE:
579 case MCAST_MSFILTER:
580 case MCAST_JOIN_GROUP:
581 case MCAST_JOIN_SOURCE_GROUP:
582 case MCAST_LEAVE_GROUP:
583 case MCAST_LEAVE_SOURCE_GROUP:
584 case MCAST_UNBLOCK_SOURCE:
585 case IP_ROUTER_ALERT:
586 return true;
587 }
588 return false;
589 }
590
591 static int do_ip_setsockopt(struct sock *sk, int level,
592 int optname, char __user *optval, unsigned int optlen)
593 {
594 struct inet_sock *inet = inet_sk(sk);
595 struct net *net = sock_net(sk);
596 int val = 0, err;
597 bool needs_rtnl = setsockopt_needs_rtnl(optname);
598
599 switch (optname) {
600 case IP_PKTINFO:
601 case IP_RECVTTL:
602 case IP_RECVOPTS:
603 case IP_RECVTOS:
604 case IP_RETOPTS:
605 case IP_TOS:
606 case IP_TTL:
607 case IP_HDRINCL:
608 case IP_MTU_DISCOVER:
609 case IP_RECVERR:
610 case IP_ROUTER_ALERT:
611 case IP_FREEBIND:
612 case IP_PASSSEC:
613 case IP_TRANSPARENT:
614 case IP_MINTTL:
615 case IP_NODEFRAG:
616 case IP_BIND_ADDRESS_NO_PORT:
617 case IP_UNICAST_IF:
618 case IP_MULTICAST_TTL:
619 case IP_MULTICAST_ALL:
620 case IP_MULTICAST_LOOP:
621 case IP_RECVORIGDSTADDR:
622 case IP_CHECKSUM:
623 case IP_RECVFRAGSIZE:
624 if (optlen >= sizeof(int)) {
625 if (get_user(val, (int __user *) optval))
626 return -EFAULT;
627 } else if (optlen >= sizeof(char)) {
628 unsigned char ucval;
629
630 if (get_user(ucval, (unsigned char __user *) optval))
631 return -EFAULT;
632 val = (int) ucval;
633 }
634 }
635
636 /* If optlen==0, it is equivalent to val == 0 */
637
638 if (ip_mroute_opt(optname))
639 return ip_mroute_setsockopt(sk, optname, optval, optlen);
640
641 err = 0;
642 if (needs_rtnl)
643 rtnl_lock();
644 lock_sock(sk);
645
646 switch (optname) {
647 case IP_OPTIONS:
648 {
649 struct ip_options_rcu *old, *opt = NULL;
650
651 if (optlen > 40)
652 goto e_inval;
653 err = ip_options_get_from_user(sock_net(sk), &opt,
654 optval, optlen);
655 if (err)
656 break;
657 old = rcu_dereference_protected(inet->inet_opt,
658 lockdep_sock_is_held(sk));
659 if (inet->is_icsk) {
660 struct inet_connection_sock *icsk = inet_csk(sk);
661 #if IS_ENABLED(CONFIG_IPV6)
662 if (sk->sk_family == PF_INET ||
663 (!((1 << sk->sk_state) &
664 (TCPF_LISTEN | TCPF_CLOSE)) &&
665 inet->inet_daddr != LOOPBACK4_IPV6)) {
666 #endif
667 if (old)
668 icsk->icsk_ext_hdr_len -= old->opt.optlen;
669 if (opt)
670 icsk->icsk_ext_hdr_len += opt->opt.optlen;
671 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
672 #if IS_ENABLED(CONFIG_IPV6)
673 }
674 #endif
675 }
676 rcu_assign_pointer(inet->inet_opt, opt);
677 if (old)
678 kfree_rcu(old, rcu);
679 break;
680 }
681 case IP_PKTINFO:
682 if (val)
683 inet->cmsg_flags |= IP_CMSG_PKTINFO;
684 else
685 inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
686 break;
687 case IP_RECVTTL:
688 if (val)
689 inet->cmsg_flags |= IP_CMSG_TTL;
690 else
691 inet->cmsg_flags &= ~IP_CMSG_TTL;
692 break;
693 case IP_RECVTOS:
694 if (val)
695 inet->cmsg_flags |= IP_CMSG_TOS;
696 else
697 inet->cmsg_flags &= ~IP_CMSG_TOS;
698 break;
699 case IP_RECVOPTS:
700 if (val)
701 inet->cmsg_flags |= IP_CMSG_RECVOPTS;
702 else
703 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
704 break;
705 case IP_RETOPTS:
706 if (val)
707 inet->cmsg_flags |= IP_CMSG_RETOPTS;
708 else
709 inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
710 break;
711 case IP_PASSSEC:
712 if (val)
713 inet->cmsg_flags |= IP_CMSG_PASSSEC;
714 else
715 inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
716 break;
717 case IP_RECVORIGDSTADDR:
718 if (val)
719 inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR;
720 else
721 inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR;
722 break;
723 case IP_CHECKSUM:
724 if (val) {
725 if (!(inet->cmsg_flags & IP_CMSG_CHECKSUM)) {
726 inet_inc_convert_csum(sk);
727 inet->cmsg_flags |= IP_CMSG_CHECKSUM;
728 }
729 } else {
730 if (inet->cmsg_flags & IP_CMSG_CHECKSUM) {
731 inet_dec_convert_csum(sk);
732 inet->cmsg_flags &= ~IP_CMSG_CHECKSUM;
733 }
734 }
735 break;
736 case IP_RECVFRAGSIZE:
737 if (sk->sk_type != SOCK_RAW && sk->sk_type != SOCK_DGRAM)
738 goto e_inval;
739 if (val)
740 inet->cmsg_flags |= IP_CMSG_RECVFRAGSIZE;
741 else
742 inet->cmsg_flags &= ~IP_CMSG_RECVFRAGSIZE;
743 break;
744 case IP_TOS: /* This sets both TOS and Precedence */
745 if (sk->sk_type == SOCK_STREAM) {
746 val &= ~INET_ECN_MASK;
747 val |= inet->tos & INET_ECN_MASK;
748 }
749 if (inet->tos != val) {
750 inet->tos = val;
751 sk->sk_priority = rt_tos2priority(val);
752 sk_dst_reset(sk);
753 }
754 break;
755 case IP_TTL:
756 if (optlen < 1)
757 goto e_inval;
758 if (val != -1 && (val < 1 || val > 255))
759 goto e_inval;
760 inet->uc_ttl = val;
761 break;
762 case IP_HDRINCL:
763 if (sk->sk_type != SOCK_RAW) {
764 err = -ENOPROTOOPT;
765 break;
766 }
767 inet->hdrincl = val ? 1 : 0;
768 break;
769 case IP_NODEFRAG:
770 if (sk->sk_type != SOCK_RAW) {
771 err = -ENOPROTOOPT;
772 break;
773 }
774 inet->nodefrag = val ? 1 : 0;
775 break;
776 case IP_BIND_ADDRESS_NO_PORT:
777 inet->bind_address_no_port = val ? 1 : 0;
778 break;
779 case IP_MTU_DISCOVER:
780 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_OMIT)
781 goto e_inval;
782 inet->pmtudisc = val;
783 break;
784 case IP_RECVERR:
785 inet->recverr = !!val;
786 if (!val)
787 skb_queue_purge(&sk->sk_error_queue);
788 break;
789 case IP_MULTICAST_TTL:
790 if (sk->sk_type == SOCK_STREAM)
791 goto e_inval;
792 if (optlen < 1)
793 goto e_inval;
794 if (val == -1)
795 val = 1;
796 if (val < 0 || val > 255)
797 goto e_inval;
798 inet->mc_ttl = val;
799 break;
800 case IP_MULTICAST_LOOP:
801 if (optlen < 1)
802 goto e_inval;
803 inet->mc_loop = !!val;
804 break;
805 case IP_UNICAST_IF:
806 {
807 struct net_device *dev = NULL;
808 int ifindex;
809
810 if (optlen != sizeof(int))
811 goto e_inval;
812
813 ifindex = (__force int)ntohl((__force __be32)val);
814 if (ifindex == 0) {
815 inet->uc_index = 0;
816 err = 0;
817 break;
818 }
819
820 dev = dev_get_by_index(sock_net(sk), ifindex);
821 err = -EADDRNOTAVAIL;
822 if (!dev)
823 break;
824 dev_put(dev);
825
826 err = -EINVAL;
827 if (sk->sk_bound_dev_if)
828 break;
829
830 inet->uc_index = ifindex;
831 err = 0;
832 break;
833 }
834 case IP_MULTICAST_IF:
835 {
836 struct ip_mreqn mreq;
837 struct net_device *dev = NULL;
838 int midx;
839
840 if (sk->sk_type == SOCK_STREAM)
841 goto e_inval;
842 /*
843 * Check the arguments are allowable
844 */
845
846 if (optlen < sizeof(struct in_addr))
847 goto e_inval;
848
849 err = -EFAULT;
850 if (optlen >= sizeof(struct ip_mreqn)) {
851 if (copy_from_user(&mreq, optval, sizeof(mreq)))
852 break;
853 } else {
854 memset(&mreq, 0, sizeof(mreq));
855 if (optlen >= sizeof(struct ip_mreq)) {
856 if (copy_from_user(&mreq, optval,
857 sizeof(struct ip_mreq)))
858 break;
859 } else if (optlen >= sizeof(struct in_addr)) {
860 if (copy_from_user(&mreq.imr_address, optval,
861 sizeof(struct in_addr)))
862 break;
863 }
864 }
865
866 if (!mreq.imr_ifindex) {
867 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) {
868 inet->mc_index = 0;
869 inet->mc_addr = 0;
870 err = 0;
871 break;
872 }
873 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr);
874 if (dev)
875 mreq.imr_ifindex = dev->ifindex;
876 } else
877 dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex);
878
879
880 err = -EADDRNOTAVAIL;
881 if (!dev)
882 break;
883
884 midx = l3mdev_master_ifindex(dev);
885
886 dev_put(dev);
887
888 err = -EINVAL;
889 if (sk->sk_bound_dev_if &&
890 mreq.imr_ifindex != sk->sk_bound_dev_if &&
891 (!midx || midx != sk->sk_bound_dev_if))
892 break;
893
894 inet->mc_index = mreq.imr_ifindex;
895 inet->mc_addr = mreq.imr_address.s_addr;
896 err = 0;
897 break;
898 }
899
900 case IP_ADD_MEMBERSHIP:
901 case IP_DROP_MEMBERSHIP:
902 {
903 struct ip_mreqn mreq;
904
905 err = -EPROTO;
906 if (inet_sk(sk)->is_icsk)
907 break;
908
909 if (optlen < sizeof(struct ip_mreq))
910 goto e_inval;
911 err = -EFAULT;
912 if (optlen >= sizeof(struct ip_mreqn)) {
913 if (copy_from_user(&mreq, optval, sizeof(mreq)))
914 break;
915 } else {
916 memset(&mreq, 0, sizeof(mreq));
917 if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq)))
918 break;
919 }
920
921 if (optname == IP_ADD_MEMBERSHIP)
922 err = ip_mc_join_group(sk, &mreq);
923 else
924 err = ip_mc_leave_group(sk, &mreq);
925 break;
926 }
927 case IP_MSFILTER:
928 {
929 struct ip_msfilter *msf;
930
931 if (optlen < IP_MSFILTER_SIZE(0))
932 goto e_inval;
933 if (optlen > sysctl_optmem_max) {
934 err = -ENOBUFS;
935 break;
936 }
937 msf = memdup_user(optval, optlen);
938 if (IS_ERR(msf)) {
939 err = PTR_ERR(msf);
940 break;
941 }
942 /* numsrc >= (1G-4) overflow in 32 bits */
943 if (msf->imsf_numsrc >= 0x3ffffffcU ||
944 msf->imsf_numsrc > net->ipv4.sysctl_igmp_max_msf) {
945 kfree(msf);
946 err = -ENOBUFS;
947 break;
948 }
949 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
950 kfree(msf);
951 err = -EINVAL;
952 break;
953 }
954 err = ip_mc_msfilter(sk, msf, 0);
955 kfree(msf);
956 break;
957 }
958 case IP_BLOCK_SOURCE:
959 case IP_UNBLOCK_SOURCE:
960 case IP_ADD_SOURCE_MEMBERSHIP:
961 case IP_DROP_SOURCE_MEMBERSHIP:
962 {
963 struct ip_mreq_source mreqs;
964 int omode, add;
965
966 if (optlen != sizeof(struct ip_mreq_source))
967 goto e_inval;
968 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
969 err = -EFAULT;
970 break;
971 }
972 if (optname == IP_BLOCK_SOURCE) {
973 omode = MCAST_EXCLUDE;
974 add = 1;
975 } else if (optname == IP_UNBLOCK_SOURCE) {
976 omode = MCAST_EXCLUDE;
977 add = 0;
978 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
979 struct ip_mreqn mreq;
980
981 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
982 mreq.imr_address.s_addr = mreqs.imr_interface;
983 mreq.imr_ifindex = 0;
984 err = ip_mc_join_group(sk, &mreq);
985 if (err && err != -EADDRINUSE)
986 break;
987 omode = MCAST_INCLUDE;
988 add = 1;
989 } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
990 omode = MCAST_INCLUDE;
991 add = 0;
992 }
993 err = ip_mc_source(add, omode, sk, &mreqs, 0);
994 break;
995 }
996 case MCAST_JOIN_GROUP:
997 case MCAST_LEAVE_GROUP:
998 {
999 struct group_req greq;
1000 struct sockaddr_in *psin;
1001 struct ip_mreqn mreq;
1002
1003 if (optlen < sizeof(struct group_req))
1004 goto e_inval;
1005 err = -EFAULT;
1006 if (copy_from_user(&greq, optval, sizeof(greq)))
1007 break;
1008 psin = (struct sockaddr_in *)&greq.gr_group;
1009 if (psin->sin_family != AF_INET)
1010 goto e_inval;
1011 memset(&mreq, 0, sizeof(mreq));
1012 mreq.imr_multiaddr = psin->sin_addr;
1013 mreq.imr_ifindex = greq.gr_interface;
1014
1015 if (optname == MCAST_JOIN_GROUP)
1016 err = ip_mc_join_group(sk, &mreq);
1017 else
1018 err = ip_mc_leave_group(sk, &mreq);
1019 break;
1020 }
1021 case MCAST_JOIN_SOURCE_GROUP:
1022 case MCAST_LEAVE_SOURCE_GROUP:
1023 case MCAST_BLOCK_SOURCE:
1024 case MCAST_UNBLOCK_SOURCE:
1025 {
1026 struct group_source_req greqs;
1027 struct ip_mreq_source mreqs;
1028 struct sockaddr_in *psin;
1029 int omode, add;
1030
1031 if (optlen != sizeof(struct group_source_req))
1032 goto e_inval;
1033 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
1034 err = -EFAULT;
1035 break;
1036 }
1037 if (greqs.gsr_group.ss_family != AF_INET ||
1038 greqs.gsr_source.ss_family != AF_INET) {
1039 err = -EADDRNOTAVAIL;
1040 break;
1041 }
1042 psin = (struct sockaddr_in *)&greqs.gsr_group;
1043 mreqs.imr_multiaddr = psin->sin_addr.s_addr;
1044 psin = (struct sockaddr_in *)&greqs.gsr_source;
1045 mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
1046 mreqs.imr_interface = 0; /* use index for mc_source */
1047
1048 if (optname == MCAST_BLOCK_SOURCE) {
1049 omode = MCAST_EXCLUDE;
1050 add = 1;
1051 } else if (optname == MCAST_UNBLOCK_SOURCE) {
1052 omode = MCAST_EXCLUDE;
1053 add = 0;
1054 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
1055 struct ip_mreqn mreq;
1056
1057 psin = (struct sockaddr_in *)&greqs.gsr_group;
1058 mreq.imr_multiaddr = psin->sin_addr;
1059 mreq.imr_address.s_addr = 0;
1060 mreq.imr_ifindex = greqs.gsr_interface;
1061 err = ip_mc_join_group(sk, &mreq);
1062 if (err && err != -EADDRINUSE)
1063 break;
1064 greqs.gsr_interface = mreq.imr_ifindex;
1065 omode = MCAST_INCLUDE;
1066 add = 1;
1067 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
1068 omode = MCAST_INCLUDE;
1069 add = 0;
1070 }
1071 err = ip_mc_source(add, omode, sk, &mreqs,
1072 greqs.gsr_interface);
1073 break;
1074 }
1075 case MCAST_MSFILTER:
1076 {
1077 struct sockaddr_in *psin;
1078 struct ip_msfilter *msf = NULL;
1079 struct group_filter *gsf = NULL;
1080 int msize, i, ifindex;
1081
1082 if (optlen < GROUP_FILTER_SIZE(0))
1083 goto e_inval;
1084 if (optlen > sysctl_optmem_max) {
1085 err = -ENOBUFS;
1086 break;
1087 }
1088 gsf = memdup_user(optval, optlen);
1089 if (IS_ERR(gsf)) {
1090 err = PTR_ERR(gsf);
1091 break;
1092 }
1093
1094 /* numsrc >= (4G-140)/128 overflow in 32 bits */
1095 if (gsf->gf_numsrc >= 0x1ffffff ||
1096 gsf->gf_numsrc > net->ipv4.sysctl_igmp_max_msf) {
1097 err = -ENOBUFS;
1098 goto mc_msf_out;
1099 }
1100 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
1101 err = -EINVAL;
1102 goto mc_msf_out;
1103 }
1104 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
1105 msf = kmalloc(msize, GFP_KERNEL);
1106 if (!msf) {
1107 err = -ENOBUFS;
1108 goto mc_msf_out;
1109 }
1110 ifindex = gsf->gf_interface;
1111 psin = (struct sockaddr_in *)&gsf->gf_group;
1112 if (psin->sin_family != AF_INET) {
1113 err = -EADDRNOTAVAIL;
1114 goto mc_msf_out;
1115 }
1116 msf->imsf_multiaddr = psin->sin_addr.s_addr;
1117 msf->imsf_interface = 0;
1118 msf->imsf_fmode = gsf->gf_fmode;
1119 msf->imsf_numsrc = gsf->gf_numsrc;
1120 err = -EADDRNOTAVAIL;
1121 for (i = 0; i < gsf->gf_numsrc; ++i) {
1122 psin = (struct sockaddr_in *)&gsf->gf_slist[i];
1123
1124 if (psin->sin_family != AF_INET)
1125 goto mc_msf_out;
1126 msf->imsf_slist[i] = psin->sin_addr.s_addr;
1127 }
1128 kfree(gsf);
1129 gsf = NULL;
1130
1131 err = ip_mc_msfilter(sk, msf, ifindex);
1132 mc_msf_out:
1133 kfree(msf);
1134 kfree(gsf);
1135 break;
1136 }
1137 case IP_MULTICAST_ALL:
1138 if (optlen < 1)
1139 goto e_inval;
1140 if (val != 0 && val != 1)
1141 goto e_inval;
1142 inet->mc_all = val;
1143 break;
1144 case IP_ROUTER_ALERT:
1145 err = ip_ra_control(sk, val ? 1 : 0, NULL);
1146 break;
1147
1148 case IP_FREEBIND:
1149 if (optlen < 1)
1150 goto e_inval;
1151 inet->freebind = !!val;
1152 break;
1153
1154 case IP_IPSEC_POLICY:
1155 case IP_XFRM_POLICY:
1156 err = -EPERM;
1157 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1158 break;
1159 err = xfrm_user_policy(sk, optname, optval, optlen);
1160 break;
1161
1162 case IP_TRANSPARENT:
1163 if (!!val && !ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) &&
1164 !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
1165 err = -EPERM;
1166 break;
1167 }
1168 if (optlen < 1)
1169 goto e_inval;
1170 inet->transparent = !!val;
1171 break;
1172
1173 case IP_MINTTL:
1174 if (optlen < 1)
1175 goto e_inval;
1176 if (val < 0 || val > 255)
1177 goto e_inval;
1178 inet->min_ttl = val;
1179 break;
1180
1181 default:
1182 err = -ENOPROTOOPT;
1183 break;
1184 }
1185 release_sock(sk);
1186 if (needs_rtnl)
1187 rtnl_unlock();
1188 return err;
1189
1190 e_inval:
1191 release_sock(sk);
1192 if (needs_rtnl)
1193 rtnl_unlock();
1194 return -EINVAL;
1195 }
1196
1197 /**
1198 * ipv4_pktinfo_prepare - transfer some info from rtable to skb
1199 * @sk: socket
1200 * @skb: buffer
1201 *
1202 * To support IP_CMSG_PKTINFO option, we store rt_iif and specific
1203 * destination in skb->cb[] before dst drop.
1204 * This way, receiver doesn't make cache line misses to read rtable.
1205 */
1206 void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb)
1207 {
1208 struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb);
1209 bool prepare = (inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) ||
1210 ipv6_sk_rxinfo(sk);
1211
1212 if (prepare && skb_rtable(skb)) {
1213 /* skb->cb is overloaded: prior to this point it is IP{6}CB
1214 * which has interface index (iif) as the first member of the
1215 * underlying inet{6}_skb_parm struct. This code then overlays
1216 * PKTINFO_SKB_CB and in_pktinfo also has iif as the first
1217 * element so the iif is picked up from the prior IPCB. If iif
1218 * is the loopback interface, then return the sending interface
1219 * (e.g., process binds socket to eth0 for Tx which is
1220 * redirected to loopback in the rtable/dst).
1221 */
1222 if (pktinfo->ipi_ifindex == LOOPBACK_IFINDEX)
1223 pktinfo->ipi_ifindex = inet_iif(skb);
1224
1225 pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb);
1226 } else {
1227 pktinfo->ipi_ifindex = 0;
1228 pktinfo->ipi_spec_dst.s_addr = 0;
1229 }
1230 /* We need to keep the dst for __ip_options_echo()
1231 * We could restrict the test to opt.ts_needtime || opt.srr,
1232 * but the following is good enough as IP options are not often used.
1233 */
1234 if (unlikely(IPCB(skb)->opt.optlen))
1235 skb_dst_force(skb);
1236 else
1237 skb_dst_drop(skb);
1238 }
1239
1240 int ip_setsockopt(struct sock *sk, int level,
1241 int optname, char __user *optval, unsigned int optlen)
1242 {
1243 int err;
1244
1245 if (level != SOL_IP)
1246 return -ENOPROTOOPT;
1247
1248 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1249 #ifdef CONFIG_NETFILTER
1250 /* we need to exclude all possible ENOPROTOOPTs except default case */
1251 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
1252 optname != IP_IPSEC_POLICY &&
1253 optname != IP_XFRM_POLICY &&
1254 !ip_mroute_opt(optname)) {
1255 lock_sock(sk);
1256 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
1257 release_sock(sk);
1258 }
1259 #endif
1260 return err;
1261 }
1262 EXPORT_SYMBOL(ip_setsockopt);
1263
1264 #ifdef CONFIG_COMPAT
1265 int compat_ip_setsockopt(struct sock *sk, int level, int optname,
1266 char __user *optval, unsigned int optlen)
1267 {
1268 int err;
1269
1270 if (level != SOL_IP)
1271 return -ENOPROTOOPT;
1272
1273 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
1274 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
1275 ip_setsockopt);
1276
1277 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1278 #ifdef CONFIG_NETFILTER
1279 /* we need to exclude all possible ENOPROTOOPTs except default case */
1280 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
1281 optname != IP_IPSEC_POLICY &&
1282 optname != IP_XFRM_POLICY &&
1283 !ip_mroute_opt(optname)) {
1284 lock_sock(sk);
1285 err = compat_nf_setsockopt(sk, PF_INET, optname,
1286 optval, optlen);
1287 release_sock(sk);
1288 }
1289 #endif
1290 return err;
1291 }
1292 EXPORT_SYMBOL(compat_ip_setsockopt);
1293 #endif
1294
1295 /*
1296 * Get the options. Note for future reference. The GET of IP options gets
1297 * the _received_ ones. The set sets the _sent_ ones.
1298 */
1299
1300 static bool getsockopt_needs_rtnl(int optname)
1301 {
1302 switch (optname) {
1303 case IP_MSFILTER:
1304 case MCAST_MSFILTER:
1305 return true;
1306 }
1307 return false;
1308 }
1309
1310 static int do_ip_getsockopt(struct sock *sk, int level, int optname,
1311 char __user *optval, int __user *optlen, unsigned int flags)
1312 {
1313 struct inet_sock *inet = inet_sk(sk);
1314 bool needs_rtnl = getsockopt_needs_rtnl(optname);
1315 int val, err = 0;
1316 int len;
1317
1318 if (level != SOL_IP)
1319 return -EOPNOTSUPP;
1320
1321 if (ip_mroute_opt(optname))
1322 return ip_mroute_getsockopt(sk, optname, optval, optlen);
1323
1324 if (get_user(len, optlen))
1325 return -EFAULT;
1326 if (len < 0)
1327 return -EINVAL;
1328
1329 if (needs_rtnl)
1330 rtnl_lock();
1331 lock_sock(sk);
1332
1333 switch (optname) {
1334 case IP_OPTIONS:
1335 {
1336 unsigned char optbuf[sizeof(struct ip_options)+40];
1337 struct ip_options *opt = (struct ip_options *)optbuf;
1338 struct ip_options_rcu *inet_opt;
1339
1340 inet_opt = rcu_dereference_protected(inet->inet_opt,
1341 lockdep_sock_is_held(sk));
1342 opt->optlen = 0;
1343 if (inet_opt)
1344 memcpy(optbuf, &inet_opt->opt,
1345 sizeof(struct ip_options) +
1346 inet_opt->opt.optlen);
1347 release_sock(sk);
1348
1349 if (opt->optlen == 0)
1350 return put_user(0, optlen);
1351
1352 ip_options_undo(opt);
1353
1354 len = min_t(unsigned int, len, opt->optlen);
1355 if (put_user(len, optlen))
1356 return -EFAULT;
1357 if (copy_to_user(optval, opt->__data, len))
1358 return -EFAULT;
1359 return 0;
1360 }
1361 case IP_PKTINFO:
1362 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
1363 break;
1364 case IP_RECVTTL:
1365 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
1366 break;
1367 case IP_RECVTOS:
1368 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
1369 break;
1370 case IP_RECVOPTS:
1371 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
1372 break;
1373 case IP_RETOPTS:
1374 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
1375 break;
1376 case IP_PASSSEC:
1377 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
1378 break;
1379 case IP_RECVORIGDSTADDR:
1380 val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0;
1381 break;
1382 case IP_CHECKSUM:
1383 val = (inet->cmsg_flags & IP_CMSG_CHECKSUM) != 0;
1384 break;
1385 case IP_RECVFRAGSIZE:
1386 val = (inet->cmsg_flags & IP_CMSG_RECVFRAGSIZE) != 0;
1387 break;
1388 case IP_TOS:
1389 val = inet->tos;
1390 break;
1391 case IP_TTL:
1392 {
1393 struct net *net = sock_net(sk);
1394 val = (inet->uc_ttl == -1 ?
1395 net->ipv4.sysctl_ip_default_ttl :
1396 inet->uc_ttl);
1397 break;
1398 }
1399 case IP_HDRINCL:
1400 val = inet->hdrincl;
1401 break;
1402 case IP_NODEFRAG:
1403 val = inet->nodefrag;
1404 break;
1405 case IP_BIND_ADDRESS_NO_PORT:
1406 val = inet->bind_address_no_port;
1407 break;
1408 case IP_MTU_DISCOVER:
1409 val = inet->pmtudisc;
1410 break;
1411 case IP_MTU:
1412 {
1413 struct dst_entry *dst;
1414 val = 0;
1415 dst = sk_dst_get(sk);
1416 if (dst) {
1417 val = dst_mtu(dst);
1418 dst_release(dst);
1419 }
1420 if (!val) {
1421 release_sock(sk);
1422 return -ENOTCONN;
1423 }
1424 break;
1425 }
1426 case IP_RECVERR:
1427 val = inet->recverr;
1428 break;
1429 case IP_MULTICAST_TTL:
1430 val = inet->mc_ttl;
1431 break;
1432 case IP_MULTICAST_LOOP:
1433 val = inet->mc_loop;
1434 break;
1435 case IP_UNICAST_IF:
1436 val = (__force int)htonl((__u32) inet->uc_index);
1437 break;
1438 case IP_MULTICAST_IF:
1439 {
1440 struct in_addr addr;
1441 len = min_t(unsigned int, len, sizeof(struct in_addr));
1442 addr.s_addr = inet->mc_addr;
1443 release_sock(sk);
1444
1445 if (put_user(len, optlen))
1446 return -EFAULT;
1447 if (copy_to_user(optval, &addr, len))
1448 return -EFAULT;
1449 return 0;
1450 }
1451 case IP_MSFILTER:
1452 {
1453 struct ip_msfilter msf;
1454
1455 if (len < IP_MSFILTER_SIZE(0)) {
1456 err = -EINVAL;
1457 goto out;
1458 }
1459 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
1460 err = -EFAULT;
1461 goto out;
1462 }
1463 err = ip_mc_msfget(sk, &msf,
1464 (struct ip_msfilter __user *)optval, optlen);
1465 goto out;
1466 }
1467 case MCAST_MSFILTER:
1468 {
1469 struct group_filter gsf;
1470
1471 if (len < GROUP_FILTER_SIZE(0)) {
1472 err = -EINVAL;
1473 goto out;
1474 }
1475 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
1476 err = -EFAULT;
1477 goto out;
1478 }
1479 err = ip_mc_gsfget(sk, &gsf,
1480 (struct group_filter __user *)optval,
1481 optlen);
1482 goto out;
1483 }
1484 case IP_MULTICAST_ALL:
1485 val = inet->mc_all;
1486 break;
1487 case IP_PKTOPTIONS:
1488 {
1489 struct msghdr msg;
1490
1491 release_sock(sk);
1492
1493 if (sk->sk_type != SOCK_STREAM)
1494 return -ENOPROTOOPT;
1495
1496 msg.msg_control = (__force void *) optval;
1497 msg.msg_controllen = len;
1498 msg.msg_flags = flags;
1499
1500 if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
1501 struct in_pktinfo info;
1502
1503 info.ipi_addr.s_addr = inet->inet_rcv_saddr;
1504 info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr;
1505 info.ipi_ifindex = inet->mc_index;
1506 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
1507 }
1508 if (inet->cmsg_flags & IP_CMSG_TTL) {
1509 int hlim = inet->mc_ttl;
1510 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
1511 }
1512 if (inet->cmsg_flags & IP_CMSG_TOS) {
1513 int tos = inet->rcv_tos;
1514 put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos);
1515 }
1516 len -= msg.msg_controllen;
1517 return put_user(len, optlen);
1518 }
1519 case IP_FREEBIND:
1520 val = inet->freebind;
1521 break;
1522 case IP_TRANSPARENT:
1523 val = inet->transparent;
1524 break;
1525 case IP_MINTTL:
1526 val = inet->min_ttl;
1527 break;
1528 default:
1529 release_sock(sk);
1530 return -ENOPROTOOPT;
1531 }
1532 release_sock(sk);
1533
1534 if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) {
1535 unsigned char ucval = (unsigned char)val;
1536 len = 1;
1537 if (put_user(len, optlen))
1538 return -EFAULT;
1539 if (copy_to_user(optval, &ucval, 1))
1540 return -EFAULT;
1541 } else {
1542 len = min_t(unsigned int, sizeof(int), len);
1543 if (put_user(len, optlen))
1544 return -EFAULT;
1545 if (copy_to_user(optval, &val, len))
1546 return -EFAULT;
1547 }
1548 return 0;
1549
1550 out:
1551 release_sock(sk);
1552 if (needs_rtnl)
1553 rtnl_unlock();
1554 return err;
1555 }
1556
1557 int ip_getsockopt(struct sock *sk, int level,
1558 int optname, char __user *optval, int __user *optlen)
1559 {
1560 int err;
1561
1562 err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0);
1563 #ifdef CONFIG_NETFILTER
1564 /* we need to exclude all possible ENOPROTOOPTs except default case */
1565 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1566 !ip_mroute_opt(optname)) {
1567 int len;
1568
1569 if (get_user(len, optlen))
1570 return -EFAULT;
1571
1572 lock_sock(sk);
1573 err = nf_getsockopt(sk, PF_INET, optname, optval,
1574 &len);
1575 release_sock(sk);
1576 if (err >= 0)
1577 err = put_user(len, optlen);
1578 return err;
1579 }
1580 #endif
1581 return err;
1582 }
1583 EXPORT_SYMBOL(ip_getsockopt);
1584
1585 #ifdef CONFIG_COMPAT
1586 int compat_ip_getsockopt(struct sock *sk, int level, int optname,
1587 char __user *optval, int __user *optlen)
1588 {
1589 int err;
1590
1591 if (optname == MCAST_MSFILTER)
1592 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1593 ip_getsockopt);
1594
1595 err = do_ip_getsockopt(sk, level, optname, optval, optlen,
1596 MSG_CMSG_COMPAT);
1597
1598 #ifdef CONFIG_NETFILTER
1599 /* we need to exclude all possible ENOPROTOOPTs except default case */
1600 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1601 !ip_mroute_opt(optname)) {
1602 int len;
1603
1604 if (get_user(len, optlen))
1605 return -EFAULT;
1606
1607 lock_sock(sk);
1608 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
1609 release_sock(sk);
1610 if (err >= 0)
1611 err = put_user(len, optlen);
1612 return err;
1613 }
1614 #endif
1615 return err;
1616 }
1617 EXPORT_SYMBOL(compat_ip_getsockopt);
1618 #endif
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