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Merge tag 'nfs-for-4.10-2' of git://git.linux-nfs.org/projects/trondmy/linux-nfs
[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_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 csum = csum_sub(csum,
121 csum_partial(skb_transport_header(skb) + tlen,
122 offset, 0));
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 > 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 - CMSG_ALIGN(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 static DEFINE_SPINLOCK(ip_ra_lock);
334
335
336 static void ip_ra_destroy_rcu(struct rcu_head *head)
337 {
338 struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu);
339
340 sock_put(ra->saved_sk);
341 kfree(ra);
342 }
343
344 int ip_ra_control(struct sock *sk, unsigned char on,
345 void (*destructor)(struct sock *))
346 {
347 struct ip_ra_chain *ra, *new_ra;
348 struct ip_ra_chain __rcu **rap;
349
350 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW)
351 return -EINVAL;
352
353 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
354
355 spin_lock_bh(&ip_ra_lock);
356 for (rap = &ip_ra_chain;
357 (ra = rcu_dereference_protected(*rap,
358 lockdep_is_held(&ip_ra_lock))) != NULL;
359 rap = &ra->next) {
360 if (ra->sk == sk) {
361 if (on) {
362 spin_unlock_bh(&ip_ra_lock);
363 kfree(new_ra);
364 return -EADDRINUSE;
365 }
366 /* dont let ip_call_ra_chain() use sk again */
367 ra->sk = NULL;
368 RCU_INIT_POINTER(*rap, ra->next);
369 spin_unlock_bh(&ip_ra_lock);
370
371 if (ra->destructor)
372 ra->destructor(sk);
373 /*
374 * Delay sock_put(sk) and kfree(ra) after one rcu grace
375 * period. This guarantee ip_call_ra_chain() dont need
376 * to mess with socket refcounts.
377 */
378 ra->saved_sk = sk;
379 call_rcu(&ra->rcu, ip_ra_destroy_rcu);
380 return 0;
381 }
382 }
383 if (!new_ra) {
384 spin_unlock_bh(&ip_ra_lock);
385 return -ENOBUFS;
386 }
387 new_ra->sk = sk;
388 new_ra->destructor = destructor;
389
390 RCU_INIT_POINTER(new_ra->next, ra);
391 rcu_assign_pointer(*rap, new_ra);
392 sock_hold(sk);
393 spin_unlock_bh(&ip_ra_lock);
394
395 return 0;
396 }
397
398 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
399 __be16 port, u32 info, u8 *payload)
400 {
401 struct sock_exterr_skb *serr;
402
403 skb = skb_clone(skb, GFP_ATOMIC);
404 if (!skb)
405 return;
406
407 serr = SKB_EXT_ERR(skb);
408 serr->ee.ee_errno = err;
409 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
410 serr->ee.ee_type = icmp_hdr(skb)->type;
411 serr->ee.ee_code = icmp_hdr(skb)->code;
412 serr->ee.ee_pad = 0;
413 serr->ee.ee_info = info;
414 serr->ee.ee_data = 0;
415 serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) -
416 skb_network_header(skb);
417 serr->port = port;
418
419 if (skb_pull(skb, payload - skb->data)) {
420 skb_reset_transport_header(skb);
421 if (sock_queue_err_skb(sk, skb) == 0)
422 return;
423 }
424 kfree_skb(skb);
425 }
426
427 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info)
428 {
429 struct inet_sock *inet = inet_sk(sk);
430 struct sock_exterr_skb *serr;
431 struct iphdr *iph;
432 struct sk_buff *skb;
433
434 if (!inet->recverr)
435 return;
436
437 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
438 if (!skb)
439 return;
440
441 skb_put(skb, sizeof(struct iphdr));
442 skb_reset_network_header(skb);
443 iph = ip_hdr(skb);
444 iph->daddr = daddr;
445
446 serr = SKB_EXT_ERR(skb);
447 serr->ee.ee_errno = err;
448 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
449 serr->ee.ee_type = 0;
450 serr->ee.ee_code = 0;
451 serr->ee.ee_pad = 0;
452 serr->ee.ee_info = info;
453 serr->ee.ee_data = 0;
454 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
455 serr->port = port;
456
457 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
458 skb_reset_transport_header(skb);
459
460 if (sock_queue_err_skb(sk, skb))
461 kfree_skb(skb);
462 }
463
464 /* For some errors we have valid addr_offset even with zero payload and
465 * zero port. Also, addr_offset should be supported if port is set.
466 */
467 static inline bool ipv4_datagram_support_addr(struct sock_exterr_skb *serr)
468 {
469 return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
470 serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port;
471 }
472
473 /* IPv4 supports cmsg on all imcp errors and some timestamps
474 *
475 * Timestamp code paths do not initialize the fields expected by cmsg:
476 * the PKTINFO fields in skb->cb[]. Fill those in here.
477 */
478 static bool ipv4_datagram_support_cmsg(const struct sock *sk,
479 struct sk_buff *skb,
480 int ee_origin)
481 {
482 struct in_pktinfo *info;
483
484 if (ee_origin == SO_EE_ORIGIN_ICMP)
485 return true;
486
487 if (ee_origin == SO_EE_ORIGIN_LOCAL)
488 return false;
489
490 /* Support IP_PKTINFO on tstamp packets if requested, to correlate
491 * timestamp with egress dev. Not possible for packets without dev
492 * or without payload (SOF_TIMESTAMPING_OPT_TSONLY).
493 */
494 if ((!(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_CMSG)) ||
495 (!skb->dev))
496 return false;
497
498 info = PKTINFO_SKB_CB(skb);
499 info->ipi_spec_dst.s_addr = ip_hdr(skb)->saddr;
500 info->ipi_ifindex = skb->dev->ifindex;
501 return true;
502 }
503
504 /*
505 * Handle MSG_ERRQUEUE
506 */
507 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
508 {
509 struct sock_exterr_skb *serr;
510 struct sk_buff *skb;
511 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name);
512 struct {
513 struct sock_extended_err ee;
514 struct sockaddr_in offender;
515 } errhdr;
516 int err;
517 int copied;
518
519 WARN_ON_ONCE(sk->sk_family == AF_INET6);
520
521 err = -EAGAIN;
522 skb = sock_dequeue_err_skb(sk);
523 if (!skb)
524 goto out;
525
526 copied = skb->len;
527 if (copied > len) {
528 msg->msg_flags |= MSG_TRUNC;
529 copied = len;
530 }
531 err = skb_copy_datagram_msg(skb, 0, msg, copied);
532 if (unlikely(err)) {
533 kfree_skb(skb);
534 return err;
535 }
536 sock_recv_timestamp(msg, sk, skb);
537
538 serr = SKB_EXT_ERR(skb);
539
540 if (sin && ipv4_datagram_support_addr(serr)) {
541 sin->sin_family = AF_INET;
542 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) +
543 serr->addr_offset);
544 sin->sin_port = serr->port;
545 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
546 *addr_len = sizeof(*sin);
547 }
548
549 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
550 sin = &errhdr.offender;
551 memset(sin, 0, sizeof(*sin));
552
553 if (ipv4_datagram_support_cmsg(sk, skb, serr->ee.ee_origin)) {
554 sin->sin_family = AF_INET;
555 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
556 if (inet_sk(sk)->cmsg_flags)
557 ip_cmsg_recv(msg, skb);
558 }
559
560 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
561
562 /* Now we could try to dump offended packet options */
563
564 msg->msg_flags |= MSG_ERRQUEUE;
565 err = copied;
566
567 consume_skb(skb);
568 out:
569 return err;
570 }
571
572
573 /*
574 * Socket option code for IP. This is the end of the line after any
575 * TCP,UDP etc options on an IP socket.
576 */
577 static bool setsockopt_needs_rtnl(int optname)
578 {
579 switch (optname) {
580 case IP_ADD_MEMBERSHIP:
581 case IP_ADD_SOURCE_MEMBERSHIP:
582 case IP_BLOCK_SOURCE:
583 case IP_DROP_MEMBERSHIP:
584 case IP_DROP_SOURCE_MEMBERSHIP:
585 case IP_MSFILTER:
586 case IP_UNBLOCK_SOURCE:
587 case MCAST_BLOCK_SOURCE:
588 case MCAST_MSFILTER:
589 case MCAST_JOIN_GROUP:
590 case MCAST_JOIN_SOURCE_GROUP:
591 case MCAST_LEAVE_GROUP:
592 case MCAST_LEAVE_SOURCE_GROUP:
593 case MCAST_UNBLOCK_SOURCE:
594 return true;
595 }
596 return false;
597 }
598
599 static int do_ip_setsockopt(struct sock *sk, int level,
600 int optname, char __user *optval, unsigned int optlen)
601 {
602 struct inet_sock *inet = inet_sk(sk);
603 struct net *net = sock_net(sk);
604 int val = 0, err;
605 bool needs_rtnl = setsockopt_needs_rtnl(optname);
606
607 switch (optname) {
608 case IP_PKTINFO:
609 case IP_RECVTTL:
610 case IP_RECVOPTS:
611 case IP_RECVTOS:
612 case IP_RETOPTS:
613 case IP_TOS:
614 case IP_TTL:
615 case IP_HDRINCL:
616 case IP_MTU_DISCOVER:
617 case IP_RECVERR:
618 case IP_ROUTER_ALERT:
619 case IP_FREEBIND:
620 case IP_PASSSEC:
621 case IP_TRANSPARENT:
622 case IP_MINTTL:
623 case IP_NODEFRAG:
624 case IP_BIND_ADDRESS_NO_PORT:
625 case IP_UNICAST_IF:
626 case IP_MULTICAST_TTL:
627 case IP_MULTICAST_ALL:
628 case IP_MULTICAST_LOOP:
629 case IP_RECVORIGDSTADDR:
630 case IP_CHECKSUM:
631 case IP_RECVFRAGSIZE:
632 if (optlen >= sizeof(int)) {
633 if (get_user(val, (int __user *) optval))
634 return -EFAULT;
635 } else if (optlen >= sizeof(char)) {
636 unsigned char ucval;
637
638 if (get_user(ucval, (unsigned char __user *) optval))
639 return -EFAULT;
640 val = (int) ucval;
641 }
642 }
643
644 /* If optlen==0, it is equivalent to val == 0 */
645
646 if (ip_mroute_opt(optname))
647 return ip_mroute_setsockopt(sk, optname, optval, optlen);
648
649 err = 0;
650 if (needs_rtnl)
651 rtnl_lock();
652 lock_sock(sk);
653
654 switch (optname) {
655 case IP_OPTIONS:
656 {
657 struct ip_options_rcu *old, *opt = NULL;
658
659 if (optlen > 40)
660 goto e_inval;
661 err = ip_options_get_from_user(sock_net(sk), &opt,
662 optval, optlen);
663 if (err)
664 break;
665 old = rcu_dereference_protected(inet->inet_opt,
666 lockdep_sock_is_held(sk));
667 if (inet->is_icsk) {
668 struct inet_connection_sock *icsk = inet_csk(sk);
669 #if IS_ENABLED(CONFIG_IPV6)
670 if (sk->sk_family == PF_INET ||
671 (!((1 << sk->sk_state) &
672 (TCPF_LISTEN | TCPF_CLOSE)) &&
673 inet->inet_daddr != LOOPBACK4_IPV6)) {
674 #endif
675 if (old)
676 icsk->icsk_ext_hdr_len -= old->opt.optlen;
677 if (opt)
678 icsk->icsk_ext_hdr_len += opt->opt.optlen;
679 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
680 #if IS_ENABLED(CONFIG_IPV6)
681 }
682 #endif
683 }
684 rcu_assign_pointer(inet->inet_opt, opt);
685 if (old)
686 kfree_rcu(old, rcu);
687 break;
688 }
689 case IP_PKTINFO:
690 if (val)
691 inet->cmsg_flags |= IP_CMSG_PKTINFO;
692 else
693 inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
694 break;
695 case IP_RECVTTL:
696 if (val)
697 inet->cmsg_flags |= IP_CMSG_TTL;
698 else
699 inet->cmsg_flags &= ~IP_CMSG_TTL;
700 break;
701 case IP_RECVTOS:
702 if (val)
703 inet->cmsg_flags |= IP_CMSG_TOS;
704 else
705 inet->cmsg_flags &= ~IP_CMSG_TOS;
706 break;
707 case IP_RECVOPTS:
708 if (val)
709 inet->cmsg_flags |= IP_CMSG_RECVOPTS;
710 else
711 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
712 break;
713 case IP_RETOPTS:
714 if (val)
715 inet->cmsg_flags |= IP_CMSG_RETOPTS;
716 else
717 inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
718 break;
719 case IP_PASSSEC:
720 if (val)
721 inet->cmsg_flags |= IP_CMSG_PASSSEC;
722 else
723 inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
724 break;
725 case IP_RECVORIGDSTADDR:
726 if (val)
727 inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR;
728 else
729 inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR;
730 break;
731 case IP_CHECKSUM:
732 if (val) {
733 if (!(inet->cmsg_flags & IP_CMSG_CHECKSUM)) {
734 inet_inc_convert_csum(sk);
735 inet->cmsg_flags |= IP_CMSG_CHECKSUM;
736 }
737 } else {
738 if (inet->cmsg_flags & IP_CMSG_CHECKSUM) {
739 inet_dec_convert_csum(sk);
740 inet->cmsg_flags &= ~IP_CMSG_CHECKSUM;
741 }
742 }
743 break;
744 case IP_RECVFRAGSIZE:
745 if (sk->sk_type != SOCK_RAW && sk->sk_type != SOCK_DGRAM)
746 goto e_inval;
747 if (val)
748 inet->cmsg_flags |= IP_CMSG_RECVFRAGSIZE;
749 else
750 inet->cmsg_flags &= ~IP_CMSG_RECVFRAGSIZE;
751 break;
752 case IP_TOS: /* This sets both TOS and Precedence */
753 if (sk->sk_type == SOCK_STREAM) {
754 val &= ~INET_ECN_MASK;
755 val |= inet->tos & INET_ECN_MASK;
756 }
757 if (inet->tos != val) {
758 inet->tos = val;
759 sk->sk_priority = rt_tos2priority(val);
760 sk_dst_reset(sk);
761 }
762 break;
763 case IP_TTL:
764 if (optlen < 1)
765 goto e_inval;
766 if (val != -1 && (val < 1 || val > 255))
767 goto e_inval;
768 inet->uc_ttl = val;
769 break;
770 case IP_HDRINCL:
771 if (sk->sk_type != SOCK_RAW) {
772 err = -ENOPROTOOPT;
773 break;
774 }
775 inet->hdrincl = val ? 1 : 0;
776 break;
777 case IP_NODEFRAG:
778 if (sk->sk_type != SOCK_RAW) {
779 err = -ENOPROTOOPT;
780 break;
781 }
782 inet->nodefrag = val ? 1 : 0;
783 break;
784 case IP_BIND_ADDRESS_NO_PORT:
785 inet->bind_address_no_port = val ? 1 : 0;
786 break;
787 case IP_MTU_DISCOVER:
788 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_OMIT)
789 goto e_inval;
790 inet->pmtudisc = val;
791 break;
792 case IP_RECVERR:
793 inet->recverr = !!val;
794 if (!val)
795 skb_queue_purge(&sk->sk_error_queue);
796 break;
797 case IP_MULTICAST_TTL:
798 if (sk->sk_type == SOCK_STREAM)
799 goto e_inval;
800 if (optlen < 1)
801 goto e_inval;
802 if (val == -1)
803 val = 1;
804 if (val < 0 || val > 255)
805 goto e_inval;
806 inet->mc_ttl = val;
807 break;
808 case IP_MULTICAST_LOOP:
809 if (optlen < 1)
810 goto e_inval;
811 inet->mc_loop = !!val;
812 break;
813 case IP_UNICAST_IF:
814 {
815 struct net_device *dev = NULL;
816 int ifindex;
817
818 if (optlen != sizeof(int))
819 goto e_inval;
820
821 ifindex = (__force int)ntohl((__force __be32)val);
822 if (ifindex == 0) {
823 inet->uc_index = 0;
824 err = 0;
825 break;
826 }
827
828 dev = dev_get_by_index(sock_net(sk), ifindex);
829 err = -EADDRNOTAVAIL;
830 if (!dev)
831 break;
832 dev_put(dev);
833
834 err = -EINVAL;
835 if (sk->sk_bound_dev_if)
836 break;
837
838 inet->uc_index = ifindex;
839 err = 0;
840 break;
841 }
842 case IP_MULTICAST_IF:
843 {
844 struct ip_mreqn mreq;
845 struct net_device *dev = NULL;
846
847 if (sk->sk_type == SOCK_STREAM)
848 goto e_inval;
849 /*
850 * Check the arguments are allowable
851 */
852
853 if (optlen < sizeof(struct in_addr))
854 goto e_inval;
855
856 err = -EFAULT;
857 if (optlen >= sizeof(struct ip_mreqn)) {
858 if (copy_from_user(&mreq, optval, sizeof(mreq)))
859 break;
860 } else {
861 memset(&mreq, 0, sizeof(mreq));
862 if (optlen >= sizeof(struct ip_mreq)) {
863 if (copy_from_user(&mreq, optval,
864 sizeof(struct ip_mreq)))
865 break;
866 } else if (optlen >= sizeof(struct in_addr)) {
867 if (copy_from_user(&mreq.imr_address, optval,
868 sizeof(struct in_addr)))
869 break;
870 }
871 }
872
873 if (!mreq.imr_ifindex) {
874 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) {
875 inet->mc_index = 0;
876 inet->mc_addr = 0;
877 err = 0;
878 break;
879 }
880 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr);
881 if (dev)
882 mreq.imr_ifindex = dev->ifindex;
883 } else
884 dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex);
885
886
887 err = -EADDRNOTAVAIL;
888 if (!dev)
889 break;
890 dev_put(dev);
891
892 err = -EINVAL;
893 if (sk->sk_bound_dev_if &&
894 mreq.imr_ifindex != sk->sk_bound_dev_if)
895 break;
896
897 inet->mc_index = mreq.imr_ifindex;
898 inet->mc_addr = mreq.imr_address.s_addr;
899 err = 0;
900 break;
901 }
902
903 case IP_ADD_MEMBERSHIP:
904 case IP_DROP_MEMBERSHIP:
905 {
906 struct ip_mreqn mreq;
907
908 err = -EPROTO;
909 if (inet_sk(sk)->is_icsk)
910 break;
911
912 if (optlen < sizeof(struct ip_mreq))
913 goto e_inval;
914 err = -EFAULT;
915 if (optlen >= sizeof(struct ip_mreqn)) {
916 if (copy_from_user(&mreq, optval, sizeof(mreq)))
917 break;
918 } else {
919 memset(&mreq, 0, sizeof(mreq));
920 if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq)))
921 break;
922 }
923
924 if (optname == IP_ADD_MEMBERSHIP)
925 err = ip_mc_join_group(sk, &mreq);
926 else
927 err = ip_mc_leave_group(sk, &mreq);
928 break;
929 }
930 case IP_MSFILTER:
931 {
932 struct ip_msfilter *msf;
933
934 if (optlen < IP_MSFILTER_SIZE(0))
935 goto e_inval;
936 if (optlen > sysctl_optmem_max) {
937 err = -ENOBUFS;
938 break;
939 }
940 msf = kmalloc(optlen, GFP_KERNEL);
941 if (!msf) {
942 err = -ENOBUFS;
943 break;
944 }
945 err = -EFAULT;
946 if (copy_from_user(msf, optval, optlen)) {
947 kfree(msf);
948 break;
949 }
950 /* numsrc >= (1G-4) overflow in 32 bits */
951 if (msf->imsf_numsrc >= 0x3ffffffcU ||
952 msf->imsf_numsrc > net->ipv4.sysctl_igmp_max_msf) {
953 kfree(msf);
954 err = -ENOBUFS;
955 break;
956 }
957 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
958 kfree(msf);
959 err = -EINVAL;
960 break;
961 }
962 err = ip_mc_msfilter(sk, msf, 0);
963 kfree(msf);
964 break;
965 }
966 case IP_BLOCK_SOURCE:
967 case IP_UNBLOCK_SOURCE:
968 case IP_ADD_SOURCE_MEMBERSHIP:
969 case IP_DROP_SOURCE_MEMBERSHIP:
970 {
971 struct ip_mreq_source mreqs;
972 int omode, add;
973
974 if (optlen != sizeof(struct ip_mreq_source))
975 goto e_inval;
976 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
977 err = -EFAULT;
978 break;
979 }
980 if (optname == IP_BLOCK_SOURCE) {
981 omode = MCAST_EXCLUDE;
982 add = 1;
983 } else if (optname == IP_UNBLOCK_SOURCE) {
984 omode = MCAST_EXCLUDE;
985 add = 0;
986 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
987 struct ip_mreqn mreq;
988
989 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
990 mreq.imr_address.s_addr = mreqs.imr_interface;
991 mreq.imr_ifindex = 0;
992 err = ip_mc_join_group(sk, &mreq);
993 if (err && err != -EADDRINUSE)
994 break;
995 omode = MCAST_INCLUDE;
996 add = 1;
997 } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
998 omode = MCAST_INCLUDE;
999 add = 0;
1000 }
1001 err = ip_mc_source(add, omode, sk, &mreqs, 0);
1002 break;
1003 }
1004 case MCAST_JOIN_GROUP:
1005 case MCAST_LEAVE_GROUP:
1006 {
1007 struct group_req greq;
1008 struct sockaddr_in *psin;
1009 struct ip_mreqn mreq;
1010
1011 if (optlen < sizeof(struct group_req))
1012 goto e_inval;
1013 err = -EFAULT;
1014 if (copy_from_user(&greq, optval, sizeof(greq)))
1015 break;
1016 psin = (struct sockaddr_in *)&greq.gr_group;
1017 if (psin->sin_family != AF_INET)
1018 goto e_inval;
1019 memset(&mreq, 0, sizeof(mreq));
1020 mreq.imr_multiaddr = psin->sin_addr;
1021 mreq.imr_ifindex = greq.gr_interface;
1022
1023 if (optname == MCAST_JOIN_GROUP)
1024 err = ip_mc_join_group(sk, &mreq);
1025 else
1026 err = ip_mc_leave_group(sk, &mreq);
1027 break;
1028 }
1029 case MCAST_JOIN_SOURCE_GROUP:
1030 case MCAST_LEAVE_SOURCE_GROUP:
1031 case MCAST_BLOCK_SOURCE:
1032 case MCAST_UNBLOCK_SOURCE:
1033 {
1034 struct group_source_req greqs;
1035 struct ip_mreq_source mreqs;
1036 struct sockaddr_in *psin;
1037 int omode, add;
1038
1039 if (optlen != sizeof(struct group_source_req))
1040 goto e_inval;
1041 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
1042 err = -EFAULT;
1043 break;
1044 }
1045 if (greqs.gsr_group.ss_family != AF_INET ||
1046 greqs.gsr_source.ss_family != AF_INET) {
1047 err = -EADDRNOTAVAIL;
1048 break;
1049 }
1050 psin = (struct sockaddr_in *)&greqs.gsr_group;
1051 mreqs.imr_multiaddr = psin->sin_addr.s_addr;
1052 psin = (struct sockaddr_in *)&greqs.gsr_source;
1053 mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
1054 mreqs.imr_interface = 0; /* use index for mc_source */
1055
1056 if (optname == MCAST_BLOCK_SOURCE) {
1057 omode = MCAST_EXCLUDE;
1058 add = 1;
1059 } else if (optname == MCAST_UNBLOCK_SOURCE) {
1060 omode = MCAST_EXCLUDE;
1061 add = 0;
1062 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
1063 struct ip_mreqn mreq;
1064
1065 psin = (struct sockaddr_in *)&greqs.gsr_group;
1066 mreq.imr_multiaddr = psin->sin_addr;
1067 mreq.imr_address.s_addr = 0;
1068 mreq.imr_ifindex = greqs.gsr_interface;
1069 err = ip_mc_join_group(sk, &mreq);
1070 if (err && err != -EADDRINUSE)
1071 break;
1072 greqs.gsr_interface = mreq.imr_ifindex;
1073 omode = MCAST_INCLUDE;
1074 add = 1;
1075 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
1076 omode = MCAST_INCLUDE;
1077 add = 0;
1078 }
1079 err = ip_mc_source(add, omode, sk, &mreqs,
1080 greqs.gsr_interface);
1081 break;
1082 }
1083 case MCAST_MSFILTER:
1084 {
1085 struct sockaddr_in *psin;
1086 struct ip_msfilter *msf = NULL;
1087 struct group_filter *gsf = NULL;
1088 int msize, i, ifindex;
1089
1090 if (optlen < GROUP_FILTER_SIZE(0))
1091 goto e_inval;
1092 if (optlen > sysctl_optmem_max) {
1093 err = -ENOBUFS;
1094 break;
1095 }
1096 gsf = kmalloc(optlen, GFP_KERNEL);
1097 if (!gsf) {
1098 err = -ENOBUFS;
1099 break;
1100 }
1101 err = -EFAULT;
1102 if (copy_from_user(gsf, optval, optlen))
1103 goto mc_msf_out;
1104
1105 /* numsrc >= (4G-140)/128 overflow in 32 bits */
1106 if (gsf->gf_numsrc >= 0x1ffffff ||
1107 gsf->gf_numsrc > net->ipv4.sysctl_igmp_max_msf) {
1108 err = -ENOBUFS;
1109 goto mc_msf_out;
1110 }
1111 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
1112 err = -EINVAL;
1113 goto mc_msf_out;
1114 }
1115 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
1116 msf = kmalloc(msize, GFP_KERNEL);
1117 if (!msf) {
1118 err = -ENOBUFS;
1119 goto mc_msf_out;
1120 }
1121 ifindex = gsf->gf_interface;
1122 psin = (struct sockaddr_in *)&gsf->gf_group;
1123 if (psin->sin_family != AF_INET) {
1124 err = -EADDRNOTAVAIL;
1125 goto mc_msf_out;
1126 }
1127 msf->imsf_multiaddr = psin->sin_addr.s_addr;
1128 msf->imsf_interface = 0;
1129 msf->imsf_fmode = gsf->gf_fmode;
1130 msf->imsf_numsrc = gsf->gf_numsrc;
1131 err = -EADDRNOTAVAIL;
1132 for (i = 0; i < gsf->gf_numsrc; ++i) {
1133 psin = (struct sockaddr_in *)&gsf->gf_slist[i];
1134
1135 if (psin->sin_family != AF_INET)
1136 goto mc_msf_out;
1137 msf->imsf_slist[i] = psin->sin_addr.s_addr;
1138 }
1139 kfree(gsf);
1140 gsf = NULL;
1141
1142 err = ip_mc_msfilter(sk, msf, ifindex);
1143 mc_msf_out:
1144 kfree(msf);
1145 kfree(gsf);
1146 break;
1147 }
1148 case IP_MULTICAST_ALL:
1149 if (optlen < 1)
1150 goto e_inval;
1151 if (val != 0 && val != 1)
1152 goto e_inval;
1153 inet->mc_all = val;
1154 break;
1155 case IP_ROUTER_ALERT:
1156 err = ip_ra_control(sk, val ? 1 : 0, NULL);
1157 break;
1158
1159 case IP_FREEBIND:
1160 if (optlen < 1)
1161 goto e_inval;
1162 inet->freebind = !!val;
1163 break;
1164
1165 case IP_IPSEC_POLICY:
1166 case IP_XFRM_POLICY:
1167 err = -EPERM;
1168 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1169 break;
1170 err = xfrm_user_policy(sk, optname, optval, optlen);
1171 break;
1172
1173 case IP_TRANSPARENT:
1174 if (!!val && !ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) &&
1175 !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
1176 err = -EPERM;
1177 break;
1178 }
1179 if (optlen < 1)
1180 goto e_inval;
1181 inet->transparent = !!val;
1182 break;
1183
1184 case IP_MINTTL:
1185 if (optlen < 1)
1186 goto e_inval;
1187 if (val < 0 || val > 255)
1188 goto e_inval;
1189 inet->min_ttl = val;
1190 break;
1191
1192 default:
1193 err = -ENOPROTOOPT;
1194 break;
1195 }
1196 release_sock(sk);
1197 if (needs_rtnl)
1198 rtnl_unlock();
1199 return err;
1200
1201 e_inval:
1202 release_sock(sk);
1203 if (needs_rtnl)
1204 rtnl_unlock();
1205 return -EINVAL;
1206 }
1207
1208 /**
1209 * ipv4_pktinfo_prepare - transfer some info from rtable to skb
1210 * @sk: socket
1211 * @skb: buffer
1212 *
1213 * To support IP_CMSG_PKTINFO option, we store rt_iif and specific
1214 * destination in skb->cb[] before dst drop.
1215 * This way, receiver doesn't make cache line misses to read rtable.
1216 */
1217 void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb)
1218 {
1219 struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb);
1220 bool prepare = (inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) ||
1221 ipv6_sk_rxinfo(sk);
1222
1223 if (prepare && skb_rtable(skb)) {
1224 /* skb->cb is overloaded: prior to this point it is IP{6}CB
1225 * which has interface index (iif) as the first member of the
1226 * underlying inet{6}_skb_parm struct. This code then overlays
1227 * PKTINFO_SKB_CB and in_pktinfo also has iif as the first
1228 * element so the iif is picked up from the prior IPCB
1229 */
1230 pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb);
1231 } else {
1232 pktinfo->ipi_ifindex = 0;
1233 pktinfo->ipi_spec_dst.s_addr = 0;
1234 }
1235 skb_dst_drop(skb);
1236 }
1237
1238 int ip_setsockopt(struct sock *sk, int level,
1239 int optname, char __user *optval, unsigned int optlen)
1240 {
1241 int err;
1242
1243 if (level != SOL_IP)
1244 return -ENOPROTOOPT;
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 lock_sock(sk);
1254 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
1255 release_sock(sk);
1256 }
1257 #endif
1258 return err;
1259 }
1260 EXPORT_SYMBOL(ip_setsockopt);
1261
1262 #ifdef CONFIG_COMPAT
1263 int compat_ip_setsockopt(struct sock *sk, int level, int optname,
1264 char __user *optval, unsigned int optlen)
1265 {
1266 int err;
1267
1268 if (level != SOL_IP)
1269 return -ENOPROTOOPT;
1270
1271 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
1272 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
1273 ip_setsockopt);
1274
1275 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1276 #ifdef CONFIG_NETFILTER
1277 /* we need to exclude all possible ENOPROTOOPTs except default case */
1278 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
1279 optname != IP_IPSEC_POLICY &&
1280 optname != IP_XFRM_POLICY &&
1281 !ip_mroute_opt(optname)) {
1282 lock_sock(sk);
1283 err = compat_nf_setsockopt(sk, PF_INET, optname,
1284 optval, optlen);
1285 release_sock(sk);
1286 }
1287 #endif
1288 return err;
1289 }
1290 EXPORT_SYMBOL(compat_ip_setsockopt);
1291 #endif
1292
1293 /*
1294 * Get the options. Note for future reference. The GET of IP options gets
1295 * the _received_ ones. The set sets the _sent_ ones.
1296 */
1297
1298 static bool getsockopt_needs_rtnl(int optname)
1299 {
1300 switch (optname) {
1301 case IP_MSFILTER:
1302 case MCAST_MSFILTER:
1303 return true;
1304 }
1305 return false;
1306 }
1307
1308 static int do_ip_getsockopt(struct sock *sk, int level, int optname,
1309 char __user *optval, int __user *optlen, unsigned int flags)
1310 {
1311 struct inet_sock *inet = inet_sk(sk);
1312 bool needs_rtnl = getsockopt_needs_rtnl(optname);
1313 int val, err = 0;
1314 int len;
1315
1316 if (level != SOL_IP)
1317 return -EOPNOTSUPP;
1318
1319 if (ip_mroute_opt(optname))
1320 return ip_mroute_getsockopt(sk, optname, optval, optlen);
1321
1322 if (get_user(len, optlen))
1323 return -EFAULT;
1324 if (len < 0)
1325 return -EINVAL;
1326
1327 if (needs_rtnl)
1328 rtnl_lock();
1329 lock_sock(sk);
1330
1331 switch (optname) {
1332 case IP_OPTIONS:
1333 {
1334 unsigned char optbuf[sizeof(struct ip_options)+40];
1335 struct ip_options *opt = (struct ip_options *)optbuf;
1336 struct ip_options_rcu *inet_opt;
1337
1338 inet_opt = rcu_dereference_protected(inet->inet_opt,
1339 lockdep_sock_is_held(sk));
1340 opt->optlen = 0;
1341 if (inet_opt)
1342 memcpy(optbuf, &inet_opt->opt,
1343 sizeof(struct ip_options) +
1344 inet_opt->opt.optlen);
1345 release_sock(sk);
1346
1347 if (opt->optlen == 0)
1348 return put_user(0, optlen);
1349
1350 ip_options_undo(opt);
1351
1352 len = min_t(unsigned int, len, opt->optlen);
1353 if (put_user(len, optlen))
1354 return -EFAULT;
1355 if (copy_to_user(optval, opt->__data, len))
1356 return -EFAULT;
1357 return 0;
1358 }
1359 case IP_PKTINFO:
1360 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
1361 break;
1362 case IP_RECVTTL:
1363 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
1364 break;
1365 case IP_RECVTOS:
1366 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
1367 break;
1368 case IP_RECVOPTS:
1369 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
1370 break;
1371 case IP_RETOPTS:
1372 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
1373 break;
1374 case IP_PASSSEC:
1375 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
1376 break;
1377 case IP_RECVORIGDSTADDR:
1378 val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0;
1379 break;
1380 case IP_CHECKSUM:
1381 val = (inet->cmsg_flags & IP_CMSG_CHECKSUM) != 0;
1382 break;
1383 case IP_RECVFRAGSIZE:
1384 val = (inet->cmsg_flags & IP_CMSG_RECVFRAGSIZE) != 0;
1385 break;
1386 case IP_TOS:
1387 val = inet->tos;
1388 break;
1389 case IP_TTL:
1390 {
1391 struct net *net = sock_net(sk);
1392 val = (inet->uc_ttl == -1 ?
1393 net->ipv4.sysctl_ip_default_ttl :
1394 inet->uc_ttl);
1395 break;
1396 }
1397 case IP_HDRINCL:
1398 val = inet->hdrincl;
1399 break;
1400 case IP_NODEFRAG:
1401 val = inet->nodefrag;
1402 break;
1403 case IP_BIND_ADDRESS_NO_PORT:
1404 val = inet->bind_address_no_port;
1405 break;
1406 case IP_MTU_DISCOVER:
1407 val = inet->pmtudisc;
1408 break;
1409 case IP_MTU:
1410 {
1411 struct dst_entry *dst;
1412 val = 0;
1413 dst = sk_dst_get(sk);
1414 if (dst) {
1415 val = dst_mtu(dst);
1416 dst_release(dst);
1417 }
1418 if (!val) {
1419 release_sock(sk);
1420 return -ENOTCONN;
1421 }
1422 break;
1423 }
1424 case IP_RECVERR:
1425 val = inet->recverr;
1426 break;
1427 case IP_MULTICAST_TTL:
1428 val = inet->mc_ttl;
1429 break;
1430 case IP_MULTICAST_LOOP:
1431 val = inet->mc_loop;
1432 break;
1433 case IP_UNICAST_IF:
1434 val = (__force int)htonl((__u32) inet->uc_index);
1435 break;
1436 case IP_MULTICAST_IF:
1437 {
1438 struct in_addr addr;
1439 len = min_t(unsigned int, len, sizeof(struct in_addr));
1440 addr.s_addr = inet->mc_addr;
1441 release_sock(sk);
1442
1443 if (put_user(len, optlen))
1444 return -EFAULT;
1445 if (copy_to_user(optval, &addr, len))
1446 return -EFAULT;
1447 return 0;
1448 }
1449 case IP_MSFILTER:
1450 {
1451 struct ip_msfilter msf;
1452
1453 if (len < IP_MSFILTER_SIZE(0)) {
1454 err = -EINVAL;
1455 goto out;
1456 }
1457 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
1458 err = -EFAULT;
1459 goto out;
1460 }
1461 err = ip_mc_msfget(sk, &msf,
1462 (struct ip_msfilter __user *)optval, optlen);
1463 goto out;
1464 }
1465 case MCAST_MSFILTER:
1466 {
1467 struct group_filter gsf;
1468
1469 if (len < GROUP_FILTER_SIZE(0)) {
1470 err = -EINVAL;
1471 goto out;
1472 }
1473 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
1474 err = -EFAULT;
1475 goto out;
1476 }
1477 err = ip_mc_gsfget(sk, &gsf,
1478 (struct group_filter __user *)optval,
1479 optlen);
1480 goto out;
1481 }
1482 case IP_MULTICAST_ALL:
1483 val = inet->mc_all;
1484 break;
1485 case IP_PKTOPTIONS:
1486 {
1487 struct msghdr msg;
1488
1489 release_sock(sk);
1490
1491 if (sk->sk_type != SOCK_STREAM)
1492 return -ENOPROTOOPT;
1493
1494 msg.msg_control = (__force void *) optval;
1495 msg.msg_controllen = len;
1496 msg.msg_flags = flags;
1497
1498 if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
1499 struct in_pktinfo info;
1500
1501 info.ipi_addr.s_addr = inet->inet_rcv_saddr;
1502 info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr;
1503 info.ipi_ifindex = inet->mc_index;
1504 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
1505 }
1506 if (inet->cmsg_flags & IP_CMSG_TTL) {
1507 int hlim = inet->mc_ttl;
1508 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
1509 }
1510 if (inet->cmsg_flags & IP_CMSG_TOS) {
1511 int tos = inet->rcv_tos;
1512 put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos);
1513 }
1514 len -= msg.msg_controllen;
1515 return put_user(len, optlen);
1516 }
1517 case IP_FREEBIND:
1518 val = inet->freebind;
1519 break;
1520 case IP_TRANSPARENT:
1521 val = inet->transparent;
1522 break;
1523 case IP_MINTTL:
1524 val = inet->min_ttl;
1525 break;
1526 default:
1527 release_sock(sk);
1528 return -ENOPROTOOPT;
1529 }
1530 release_sock(sk);
1531
1532 if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) {
1533 unsigned char ucval = (unsigned char)val;
1534 len = 1;
1535 if (put_user(len, optlen))
1536 return -EFAULT;
1537 if (copy_to_user(optval, &ucval, 1))
1538 return -EFAULT;
1539 } else {
1540 len = min_t(unsigned int, sizeof(int), len);
1541 if (put_user(len, optlen))
1542 return -EFAULT;
1543 if (copy_to_user(optval, &val, len))
1544 return -EFAULT;
1545 }
1546 return 0;
1547
1548 out:
1549 release_sock(sk);
1550 if (needs_rtnl)
1551 rtnl_unlock();
1552 return err;
1553 }
1554
1555 int ip_getsockopt(struct sock *sk, int level,
1556 int optname, char __user *optval, int __user *optlen)
1557 {
1558 int err;
1559
1560 err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0);
1561 #ifdef CONFIG_NETFILTER
1562 /* we need to exclude all possible ENOPROTOOPTs except default case */
1563 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1564 !ip_mroute_opt(optname)) {
1565 int len;
1566
1567 if (get_user(len, optlen))
1568 return -EFAULT;
1569
1570 lock_sock(sk);
1571 err = nf_getsockopt(sk, PF_INET, optname, optval,
1572 &len);
1573 release_sock(sk);
1574 if (err >= 0)
1575 err = put_user(len, optlen);
1576 return err;
1577 }
1578 #endif
1579 return err;
1580 }
1581 EXPORT_SYMBOL(ip_getsockopt);
1582
1583 #ifdef CONFIG_COMPAT
1584 int compat_ip_getsockopt(struct sock *sk, int level, int optname,
1585 char __user *optval, int __user *optlen)
1586 {
1587 int err;
1588
1589 if (optname == MCAST_MSFILTER)
1590 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1591 ip_getsockopt);
1592
1593 err = do_ip_getsockopt(sk, level, optname, optval, optlen,
1594 MSG_CMSG_COMPAT);
1595
1596 #ifdef CONFIG_NETFILTER
1597 /* we need to exclude all possible ENOPROTOOPTs except default case */
1598 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1599 !ip_mroute_opt(optname)) {
1600 int len;
1601
1602 if (get_user(len, optlen))
1603 return -EFAULT;
1604
1605 lock_sock(sk);
1606 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
1607 release_sock(sk);
1608 if (err >= 0)
1609 err = put_user(len, optlen);
1610 return err;
1611 }
1612 #endif
1613 return err;
1614 }
1615 EXPORT_SYMBOL(compat_ip_getsockopt);
1616 #endif
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