1// SPDX-License-Identifier: GPL-2.0
2/*
3 * INET An implementation of the TCP/IP protocol suite for the LINUX
4 * operating system. INET is implemented using the BSD Socket
5 * interface as the means of communication with the user level.
6 *
7 * The IP to API glue.
8 *
9 * Authors: see ip.c
10 *
11 * Fixes:
12 * Many : Split from ip.c , see ip.c for history.
13 * Martin Mares : TOS setting fixed.
14 * Alan Cox : Fixed a couple of oopses in Martin's
15 * TOS tweaks.
16 * Mike McLagan : Routing by source
17 */
18
19#include <linux/module.h>
20#include <linux/types.h>
21#include <linux/mm.h>
22#include <linux/skbuff.h>
23#include <linux/ip.h>
24#include <linux/icmp.h>
25#include <linux/inetdevice.h>
26#include <linux/netdevice.h>
27#include <linux/slab.h>
28#include <net/sock.h>
29#include <net/ip.h>
30#include <net/icmp.h>
31#include <net/tcp_states.h>
32#include <linux/udp.h>
33#include <linux/igmp.h>
34#include <linux/netfilter.h>
35#include <linux/route.h>
36#include <linux/mroute.h>
37#include <net/inet_ecn.h>
38#include <net/route.h>
39#include <net/xfrm.h>
40#include <net/compat.h>
41#include <net/checksum.h>
42#if IS_ENABLED(CONFIG_IPV6)
43#include <net/transp_v6.h>
44#endif
45#include <net/ip_fib.h>
46
47#include <linux/errqueue.h>
48#include <linux/uaccess.h>
49
50#include <linux/bpfilter.h>
51
52/*
53 * SOL_IP control messages.
54 */
55
56static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb)
57{
58 struct in_pktinfo info = *PKTINFO_SKB_CB(skb);
59
60 info.ipi_addr.s_addr = ip_hdr(skb)->daddr;
61
62 put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
63}
64
65static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb)
66{
67 int ttl = ip_hdr(skb)->ttl;
68 put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl);
69}
70
71static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb)
72{
73 put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos);
74}
75
76static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb)
77{
78 if (IPCB(skb)->opt.optlen == 0)
79 return;
80
81 put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen,
82 ip_hdr(skb) + 1);
83}
84
85
86static void ip_cmsg_recv_retopts(struct net *net, struct msghdr *msg,
87 struct sk_buff *skb)
88{
89 unsigned char optbuf[sizeof(struct ip_options) + 40];
90 struct ip_options *opt = (struct ip_options *)optbuf;
91
92 if (IPCB(skb)->opt.optlen == 0)
93 return;
94
95 if (ip_options_echo(net, opt, skb)) {
96 msg->msg_flags |= MSG_CTRUNC;
97 return;
98 }
99 ip_options_undo(opt);
100
101 put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data);
102}
103
104static void ip_cmsg_recv_fragsize(struct msghdr *msg, struct sk_buff *skb)
105{
106 int val;
107
108 if (IPCB(skb)->frag_max_size == 0)
109 return;
110
111 val = IPCB(skb)->frag_max_size;
112 put_cmsg(msg, SOL_IP, IP_RECVFRAGSIZE, sizeof(val), &val);
113}
114
115static void ip_cmsg_recv_checksum(struct msghdr *msg, struct sk_buff *skb,
116 int tlen, int offset)
117{
118 __wsum csum = skb->csum;
119
120 if (skb->ip_summed != CHECKSUM_COMPLETE)
121 return;
122
123 if (offset != 0) {
124 int tend_off = skb_transport_offset(skb) + tlen;
125 csum = csum_sub(csum, skb_checksum(skb, tend_off, offset, 0));
126 }
127
128 put_cmsg(msg, SOL_IP, IP_CHECKSUM, sizeof(__wsum), &csum);
129}
130
131static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
132{
133 char *secdata;
134 u32 seclen, secid;
135 int err;
136
137 err = security_socket_getpeersec_dgram(NULL, skb, &secid);
138 if (err)
139 return;
140
141 err = security_secid_to_secctx(secid, &secdata, &seclen);
142 if (err)
143 return;
144
145 put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata);
146 security_release_secctx(secdata, seclen);
147}
148
149static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb)
150{
151 __be16 _ports[2], *ports;
152 struct sockaddr_in sin;
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 ports = skb_header_pointer(skb, skb_transport_offset(skb),
159 sizeof(_ports), &_ports);
160 if (!ports)
161 return;
162
163 sin.sin_family = AF_INET;
164 sin.sin_addr.s_addr = ip_hdr(skb)->daddr;
165 sin.sin_port = ports[1];
166 memset(sin.sin_zero, 0, sizeof(sin.sin_zero));
167
168 put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin);
169}
170
171void ip_cmsg_recv_offset(struct msghdr *msg, struct sock *sk,
172 struct sk_buff *skb, int tlen, int offset)
173{
174 struct inet_sock *inet = inet_sk(sk);
175 unsigned int flags = inet->cmsg_flags;
176
177 /* Ordered by supposed usage frequency */
178 if (flags & IP_CMSG_PKTINFO) {
179 ip_cmsg_recv_pktinfo(msg, skb);
180
181 flags &= ~IP_CMSG_PKTINFO;
182 if (!flags)
183 return;
184 }
185
186 if (flags & IP_CMSG_TTL) {
187 ip_cmsg_recv_ttl(msg, skb);
188
189 flags &= ~IP_CMSG_TTL;
190 if (!flags)
191 return;
192 }
193
194 if (flags & IP_CMSG_TOS) {
195 ip_cmsg_recv_tos(msg, skb);
196
197 flags &= ~IP_CMSG_TOS;
198 if (!flags)
199 return;
200 }
201
202 if (flags & IP_CMSG_RECVOPTS) {
203 ip_cmsg_recv_opts(msg, skb);
204
205 flags &= ~IP_CMSG_RECVOPTS;
206 if (!flags)
207 return;
208 }
209
210 if (flags & IP_CMSG_RETOPTS) {
211 ip_cmsg_recv_retopts(sock_net(sk), msg, skb);
212
213 flags &= ~IP_CMSG_RETOPTS;
214 if (!flags)
215 return;
216 }
217
218 if (flags & IP_CMSG_PASSSEC) {
219 ip_cmsg_recv_security(msg, skb);
220
221 flags &= ~IP_CMSG_PASSSEC;
222 if (!flags)
223 return;
224 }
225
226 if (flags & IP_CMSG_ORIGDSTADDR) {
227 ip_cmsg_recv_dstaddr(msg, skb);
228
229 flags &= ~IP_CMSG_ORIGDSTADDR;
230 if (!flags)
231 return;
232 }
233
234 if (flags & IP_CMSG_CHECKSUM)
235 ip_cmsg_recv_checksum(msg, skb, tlen, offset);
236
237 if (flags & IP_CMSG_RECVFRAGSIZE)
238 ip_cmsg_recv_fragsize(msg, skb);
239}
240EXPORT_SYMBOL(ip_cmsg_recv_offset);
241
242int ip_cmsg_send(struct sock *sk, struct msghdr *msg, struct ipcm_cookie *ipc,
243 bool allow_ipv6)
244{
245 int err, val;
246 struct cmsghdr *cmsg;
247 struct net *net = sock_net(sk);
248
249 for_each_cmsghdr(cmsg, msg) {
250 if (!CMSG_OK(msg, cmsg))
251 return -EINVAL;
252#if IS_ENABLED(CONFIG_IPV6)
253 if (allow_ipv6 &&
254 cmsg->cmsg_level == SOL_IPV6 &&
255 cmsg->cmsg_type == IPV6_PKTINFO) {
256 struct in6_pktinfo *src_info;
257
258 if (cmsg->cmsg_len < CMSG_LEN(sizeof(*src_info)))
259 return -EINVAL;
260 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
261 if (!ipv6_addr_v4mapped(&src_info->ipi6_addr))
262 return -EINVAL;
263 if (src_info->ipi6_ifindex)
264 ipc->oif = src_info->ipi6_ifindex;
265 ipc->addr = src_info->ipi6_addr.s6_addr32[3];
266 continue;
267 }
268#endif
269 if (cmsg->cmsg_level == SOL_SOCKET) {
270 err = __sock_cmsg_send(sk, msg, cmsg, &ipc->sockc);
271 if (err)
272 return err;
273 continue;
274 }
275
276 if (cmsg->cmsg_level != SOL_IP)
277 continue;
278 switch (cmsg->cmsg_type) {
279 case IP_RETOPTS:
280 err = cmsg->cmsg_len - sizeof(struct cmsghdr);
281
282 /* Our caller is responsible for freeing ipc->opt */
283 err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg),
284 err < 40 ? err : 40);
285 if (err)
286 return err;
287 break;
288 case IP_PKTINFO:
289 {
290 struct in_pktinfo *info;
291 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
292 return -EINVAL;
293 info = (struct in_pktinfo *)CMSG_DATA(cmsg);
294 if (info->ipi_ifindex)
295 ipc->oif = info->ipi_ifindex;
296 ipc->addr = info->ipi_spec_dst.s_addr;
297 break;
298 }
299 case IP_TTL:
300 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
301 return -EINVAL;
302 val = *(int *)CMSG_DATA(cmsg);
303 if (val < 1 || val > 255)
304 return -EINVAL;
305 ipc->ttl = val;
306 break;
307 case IP_TOS:
308 if (cmsg->cmsg_len == CMSG_LEN(sizeof(int)))
309 val = *(int *)CMSG_DATA(cmsg);
310 else if (cmsg->cmsg_len == CMSG_LEN(sizeof(u8)))
311 val = *(u8 *)CMSG_DATA(cmsg);
312 else
313 return -EINVAL;
314 if (val < 0 || val > 255)
315 return -EINVAL;
316 ipc->tos = val;
317 ipc->priority = rt_tos2priority(ipc->tos);
318 break;
319
320 default:
321 return -EINVAL;
322 }
323 }
324 return 0;
325}
326
327static void ip_ra_destroy_rcu(struct rcu_head *head)
328{
329 struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu);
330
331 sock_put(ra->saved_sk);
332 kfree(ra);
333}
334
335int ip_ra_control(struct sock *sk, unsigned char on,
336 void (*destructor)(struct sock *))
337{
338 struct ip_ra_chain *ra, *new_ra;
339 struct ip_ra_chain __rcu **rap;
340 struct net *net = sock_net(sk);
341
342 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW)
343 return -EINVAL;
344
345 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
346
347 mutex_lock(&net->ipv4.ra_mutex);
348 for (rap = &net->ipv4.ra_chain;
349 (ra = rcu_dereference_protected(*rap,
350 lockdep_is_held(&net->ipv4.ra_mutex))) != NULL;
351 rap = &ra->next) {
352 if (ra->sk == sk) {
353 if (on) {
354 mutex_unlock(&net->ipv4.ra_mutex);
355 kfree(new_ra);
356 return -EADDRINUSE;
357 }
358 /* dont let ip_call_ra_chain() use sk again */
359 ra->sk = NULL;
360 RCU_INIT_POINTER(*rap, ra->next);
361 mutex_unlock(&net->ipv4.ra_mutex);
362
363 if (ra->destructor)
364 ra->destructor(sk);
365 /*
366 * Delay sock_put(sk) and kfree(ra) after one rcu grace
367 * period. This guarantee ip_call_ra_chain() dont need
368 * to mess with socket refcounts.
369 */
370 ra->saved_sk = sk;
371 call_rcu(&ra->rcu, ip_ra_destroy_rcu);
372 return 0;
373 }
374 }
375 if (!new_ra) {
376 mutex_unlock(&net->ipv4.ra_mutex);
377 return -ENOBUFS;
378 }
379 new_ra->sk = sk;
380 new_ra->destructor = destructor;
381
382 RCU_INIT_POINTER(new_ra->next, ra);
383 rcu_assign_pointer(*rap, new_ra);
384 sock_hold(sk);
385 mutex_unlock(&net->ipv4.ra_mutex);
386
387 return 0;
388}
389
390void 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
419void 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 */
459static 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 */
470static 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 */
498int 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 err = -EAGAIN;
511 skb = sock_dequeue_err_skb(sk);
512 if (!skb)
513 goto out;
514
515 copied = skb->len;
516 if (copied > len) {
517 msg->msg_flags |= MSG_TRUNC;
518 copied = len;
519 }
520 err = skb_copy_datagram_msg(skb, 0, msg, copied);
521 if (unlikely(err)) {
522 kfree_skb(skb);
523 return err;
524 }
525 sock_recv_timestamp(msg, sk, skb);
526
527 serr = SKB_EXT_ERR(skb);
528
529 if (sin && ipv4_datagram_support_addr(serr)) {
530 sin->sin_family = AF_INET;
531 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) +
532 serr->addr_offset);
533 sin->sin_port = serr->port;
534 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
535 *addr_len = sizeof(*sin);
536 }
537
538 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
539 sin = &errhdr.offender;
540 memset(sin, 0, sizeof(*sin));
541
542 if (ipv4_datagram_support_cmsg(sk, skb, serr->ee.ee_origin)) {
543 sin->sin_family = AF_INET;
544 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
545 if (inet_sk(sk)->cmsg_flags)
546 ip_cmsg_recv(msg, skb);
547 }
548
549 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
550
551 /* Now we could try to dump offended packet options */
552
553 msg->msg_flags |= MSG_ERRQUEUE;
554 err = copied;
555
556 consume_skb(skb);
557out:
558 return err;
559}
560
561
562/*
563 * Socket option code for IP. This is the end of the line after any
564 * TCP,UDP etc options on an IP socket.
565 */
566static bool setsockopt_needs_rtnl(int optname)
567{
568 switch (optname) {
569 case IP_ADD_MEMBERSHIP:
570 case IP_ADD_SOURCE_MEMBERSHIP:
571 case IP_BLOCK_SOURCE:
572 case IP_DROP_MEMBERSHIP:
573 case IP_DROP_SOURCE_MEMBERSHIP:
574 case IP_MSFILTER:
575 case IP_UNBLOCK_SOURCE:
576 case MCAST_BLOCK_SOURCE:
577 case MCAST_MSFILTER:
578 case MCAST_JOIN_GROUP:
579 case MCAST_JOIN_SOURCE_GROUP:
580 case MCAST_LEAVE_GROUP:
581 case MCAST_LEAVE_SOURCE_GROUP:
582 case MCAST_UNBLOCK_SOURCE:
583 return true;
584 }
585 return false;
586}
587
588static int do_ip_setsockopt(struct sock *sk, int level,
589 int optname, char __user *optval, unsigned int optlen)
590{
591 struct inet_sock *inet = inet_sk(sk);
592 struct net *net = sock_net(sk);
593 int val = 0, err;
594 bool needs_rtnl = setsockopt_needs_rtnl(optname);
595
596 switch (optname) {
597 case IP_PKTINFO:
598 case IP_RECVTTL:
599 case IP_RECVOPTS:
600 case IP_RECVTOS:
601 case IP_RETOPTS:
602 case IP_TOS:
603 case IP_TTL:
604 case IP_HDRINCL:
605 case IP_MTU_DISCOVER:
606 case IP_RECVERR:
607 case IP_ROUTER_ALERT:
608 case IP_FREEBIND:
609 case IP_PASSSEC:
610 case IP_TRANSPARENT:
611 case IP_MINTTL:
612 case IP_NODEFRAG:
613 case IP_BIND_ADDRESS_NO_PORT:
614 case IP_UNICAST_IF:
615 case IP_MULTICAST_TTL:
616 case IP_MULTICAST_ALL:
617 case IP_MULTICAST_LOOP:
618 case IP_RECVORIGDSTADDR:
619 case IP_CHECKSUM:
620 case IP_RECVFRAGSIZE:
621 if (optlen >= sizeof(int)) {
622 if (get_user(val, (int __user *) optval))
623 return -EFAULT;
624 } else if (optlen >= sizeof(char)) {
625 unsigned char ucval;
626
627 if (get_user(ucval, (unsigned char __user *) optval))
628 return -EFAULT;
629 val = (int) ucval;
630 }
631 }
632
633 /* If optlen==0, it is equivalent to val == 0 */
634
635 if (optname == IP_ROUTER_ALERT)
636 return ip_ra_control(sk, val ? 1 : 0, NULL);
637 if (ip_mroute_opt(optname))
638 return ip_mroute_setsockopt(sk, optname, optval, optlen);
639
640 err = 0;
641 if (needs_rtnl)
642 rtnl_lock();
643 lock_sock(sk);
644
645 switch (optname) {
646 case IP_OPTIONS:
647 {
648 struct ip_options_rcu *old, *opt = NULL;
649
650 if (optlen > 40)
651 goto e_inval;
652 err = ip_options_get_from_user(sock_net(sk), &opt,
653 optval, optlen);
654 if (err)
655 break;
656 old = rcu_dereference_protected(inet->inet_opt,
657 lockdep_sock_is_held(sk));
658 if (inet->is_icsk) {
659 struct inet_connection_sock *icsk = inet_csk(sk);
660#if IS_ENABLED(CONFIG_IPV6)
661 if (sk->sk_family == PF_INET ||
662 (!((1 << sk->sk_state) &
663 (TCPF_LISTEN | TCPF_CLOSE)) &&
664 inet->inet_daddr != LOOPBACK4_IPV6)) {
665#endif
666 if (old)
667 icsk->icsk_ext_hdr_len -= old->opt.optlen;
668 if (opt)
669 icsk->icsk_ext_hdr_len += opt->opt.optlen;
670 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
671#if IS_ENABLED(CONFIG_IPV6)
672 }
673#endif
674 }
675 rcu_assign_pointer(inet->inet_opt, opt);
676 if (old)
677 kfree_rcu(old, rcu);
678 break;
679 }
680 case IP_PKTINFO:
681 if (val)
682 inet->cmsg_flags |= IP_CMSG_PKTINFO;
683 else
684 inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
685 break;
686 case IP_RECVTTL:
687 if (val)
688 inet->cmsg_flags |= IP_CMSG_TTL;
689 else
690 inet->cmsg_flags &= ~IP_CMSG_TTL;
691 break;
692 case IP_RECVTOS:
693 if (val)
694 inet->cmsg_flags |= IP_CMSG_TOS;
695 else
696 inet->cmsg_flags &= ~IP_CMSG_TOS;
697 break;
698 case IP_RECVOPTS:
699 if (val)
700 inet->cmsg_flags |= IP_CMSG_RECVOPTS;
701 else
702 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
703 break;
704 case IP_RETOPTS:
705 if (val)
706 inet->cmsg_flags |= IP_CMSG_RETOPTS;
707 else
708 inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
709 break;
710 case IP_PASSSEC:
711 if (val)
712 inet->cmsg_flags |= IP_CMSG_PASSSEC;
713 else
714 inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
715 break;
716 case IP_RECVORIGDSTADDR:
717 if (val)
718 inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR;
719 else
720 inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR;
721 break;
722 case IP_CHECKSUM:
723 if (val) {
724 if (!(inet->cmsg_flags & IP_CMSG_CHECKSUM)) {
725 inet_inc_convert_csum(sk);
726 inet->cmsg_flags |= IP_CMSG_CHECKSUM;
727 }
728 } else {
729 if (inet->cmsg_flags & IP_CMSG_CHECKSUM) {
730 inet_dec_convert_csum(sk);
731 inet->cmsg_flags &= ~IP_CMSG_CHECKSUM;
732 }
733 }
734 break;
735 case IP_RECVFRAGSIZE:
736 if (sk->sk_type != SOCK_RAW && sk->sk_type != SOCK_DGRAM)
737 goto e_inval;
738 if (val)
739 inet->cmsg_flags |= IP_CMSG_RECVFRAGSIZE;
740 else
741 inet->cmsg_flags &= ~IP_CMSG_RECVFRAGSIZE;
742 break;
743 case IP_TOS: /* This sets both TOS and Precedence */
744 if (sk->sk_type == SOCK_STREAM) {
745 val &= ~INET_ECN_MASK;
746 val |= inet->tos & INET_ECN_MASK;
747 }
748 if (inet->tos != val) {
749 inet->tos = val;
750 sk->sk_priority = rt_tos2priority(val);
751 sk_dst_reset(sk);
752 }
753 break;
754 case IP_TTL:
755 if (optlen < 1)
756 goto e_inval;
757 if (val != -1 && (val < 1 || val > 255))
758 goto e_inval;
759 inet->uc_ttl = val;
760 break;
761 case IP_HDRINCL:
762 if (sk->sk_type != SOCK_RAW) {
763 err = -ENOPROTOOPT;
764 break;
765 }
766 inet->hdrincl = val ? 1 : 0;
767 break;
768 case IP_NODEFRAG:
769 if (sk->sk_type != SOCK_RAW) {
770 err = -ENOPROTOOPT;
771 break;
772 }
773 inet->nodefrag = val ? 1 : 0;
774 break;
775 case IP_BIND_ADDRESS_NO_PORT:
776 inet->bind_address_no_port = val ? 1 : 0;
777 break;
778 case IP_MTU_DISCOVER:
779 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_OMIT)
780 goto e_inval;
781 inet->pmtudisc = val;
782 break;
783 case IP_RECVERR:
784 inet->recverr = !!val;
785 if (!val)
786 skb_queue_purge(&sk->sk_error_queue);
787 break;
788 case IP_MULTICAST_TTL:
789 if (sk->sk_type == SOCK_STREAM)
790 goto e_inval;
791 if (optlen < 1)
792 goto e_inval;
793 if (val == -1)
794 val = 1;
795 if (val < 0 || val > 255)
796 goto e_inval;
797 inet->mc_ttl = val;
798 break;
799 case IP_MULTICAST_LOOP:
800 if (optlen < 1)
801 goto e_inval;
802 inet->mc_loop = !!val;
803 break;
804 case IP_UNICAST_IF:
805 {
806 struct net_device *dev = NULL;
807 int ifindex;
808 int midx;
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
825 midx = l3mdev_master_ifindex(dev);
826 dev_put(dev);
827
828 err = -EINVAL;
829 if (sk->sk_bound_dev_if &&
830 (!midx || midx != sk->sk_bound_dev_if))
831 break;
832
833 inet->uc_index = ifindex;
834 err = 0;
835 break;
836 }
837 case IP_MULTICAST_IF:
838 {
839 struct ip_mreqn mreq;
840 struct net_device *dev = NULL;
841 int midx;
842
843 if (sk->sk_type == SOCK_STREAM)
844 goto e_inval;
845 /*
846 * Check the arguments are allowable
847 */
848
849 if (optlen < sizeof(struct in_addr))
850 goto e_inval;
851
852 err = -EFAULT;
853 if (optlen >= sizeof(struct ip_mreqn)) {
854 if (copy_from_user(&mreq, optval, sizeof(mreq)))
855 break;
856 } else {
857 memset(&mreq, 0, sizeof(mreq));
858 if (optlen >= sizeof(struct ip_mreq)) {
859 if (copy_from_user(&mreq, optval,
860 sizeof(struct ip_mreq)))
861 break;
862 } else if (optlen >= sizeof(struct in_addr)) {
863 if (copy_from_user(&mreq.imr_address, optval,
864 sizeof(struct in_addr)))
865 break;
866 }
867 }
868
869 if (!mreq.imr_ifindex) {
870 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) {
871 inet->mc_index = 0;
872 inet->mc_addr = 0;
873 err = 0;
874 break;
875 }
876 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr);
877 if (dev)
878 mreq.imr_ifindex = dev->ifindex;
879 } else
880 dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex);
881
882
883 err = -EADDRNOTAVAIL;
884 if (!dev)
885 break;
886
887 midx = l3mdev_master_ifindex(dev);
888
889 dev_put(dev);
890
891 err = -EINVAL;
892 if (sk->sk_bound_dev_if &&
893 mreq.imr_ifindex != sk->sk_bound_dev_if &&
894 (!midx || midx != 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 = memdup_user(optval, optlen);
941 if (IS_ERR(msf)) {
942 err = PTR_ERR(msf);
943 break;
944 }
945 /* numsrc >= (1G-4) overflow in 32 bits */
946 if (msf->imsf_numsrc >= 0x3ffffffcU ||
947 msf->imsf_numsrc > net->ipv4.sysctl_igmp_max_msf) {
948 kfree(msf);
949 err = -ENOBUFS;
950 break;
951 }
952 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
953 kfree(msf);
954 err = -EINVAL;
955 break;
956 }
957 err = ip_mc_msfilter(sk, msf, 0);
958 kfree(msf);
959 break;
960 }
961 case IP_BLOCK_SOURCE:
962 case IP_UNBLOCK_SOURCE:
963 case IP_ADD_SOURCE_MEMBERSHIP:
964 case IP_DROP_SOURCE_MEMBERSHIP:
965 {
966 struct ip_mreq_source mreqs;
967 int omode, add;
968
969 if (optlen != sizeof(struct ip_mreq_source))
970 goto e_inval;
971 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
972 err = -EFAULT;
973 break;
974 }
975 if (optname == IP_BLOCK_SOURCE) {
976 omode = MCAST_EXCLUDE;
977 add = 1;
978 } else if (optname == IP_UNBLOCK_SOURCE) {
979 omode = MCAST_EXCLUDE;
980 add = 0;
981 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
982 struct ip_mreqn mreq;
983
984 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
985 mreq.imr_address.s_addr = mreqs.imr_interface;
986 mreq.imr_ifindex = 0;
987 err = ip_mc_join_group_ssm(sk, &mreq, MCAST_INCLUDE);
988 if (err && err != -EADDRINUSE)
989 break;
990 omode = MCAST_INCLUDE;
991 add = 1;
992 } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
993 omode = MCAST_INCLUDE;
994 add = 0;
995 }
996 err = ip_mc_source(add, omode, sk, &mreqs, 0);
997 break;
998 }
999 case MCAST_JOIN_GROUP:
1000 case MCAST_LEAVE_GROUP:
1001 {
1002 struct group_req greq;
1003 struct sockaddr_in *psin;
1004 struct ip_mreqn mreq;
1005
1006 if (optlen < sizeof(struct group_req))
1007 goto e_inval;
1008 err = -EFAULT;
1009 if (copy_from_user(&greq, optval, sizeof(greq)))
1010 break;
1011 psin = (struct sockaddr_in *)&greq.gr_group;
1012 if (psin->sin_family != AF_INET)
1013 goto e_inval;
1014 memset(&mreq, 0, sizeof(mreq));
1015 mreq.imr_multiaddr = psin->sin_addr;
1016 mreq.imr_ifindex = greq.gr_interface;
1017
1018 if (optname == MCAST_JOIN_GROUP)
1019 err = ip_mc_join_group(sk, &mreq);
1020 else
1021 err = ip_mc_leave_group(sk, &mreq);
1022 break;
1023 }
1024 case MCAST_JOIN_SOURCE_GROUP:
1025 case MCAST_LEAVE_SOURCE_GROUP:
1026 case MCAST_BLOCK_SOURCE:
1027 case MCAST_UNBLOCK_SOURCE:
1028 {
1029 struct group_source_req greqs;
1030 struct ip_mreq_source mreqs;
1031 struct sockaddr_in *psin;
1032 int omode, add;
1033
1034 if (optlen != sizeof(struct group_source_req))
1035 goto e_inval;
1036 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
1037 err = -EFAULT;
1038 break;
1039 }
1040 if (greqs.gsr_group.ss_family != AF_INET ||
1041 greqs.gsr_source.ss_family != AF_INET) {
1042 err = -EADDRNOTAVAIL;
1043 break;
1044 }
1045 psin = (struct sockaddr_in *)&greqs.gsr_group;
1046 mreqs.imr_multiaddr = psin->sin_addr.s_addr;
1047 psin = (struct sockaddr_in *)&greqs.gsr_source;
1048 mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
1049 mreqs.imr_interface = 0; /* use index for mc_source */
1050
1051 if (optname == MCAST_BLOCK_SOURCE) {
1052 omode = MCAST_EXCLUDE;
1053 add = 1;
1054 } else if (optname == MCAST_UNBLOCK_SOURCE) {
1055 omode = MCAST_EXCLUDE;
1056 add = 0;
1057 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
1058 struct ip_mreqn mreq;
1059
1060 psin = (struct sockaddr_in *)&greqs.gsr_group;
1061 mreq.imr_multiaddr = psin->sin_addr;
1062 mreq.imr_address.s_addr = 0;
1063 mreq.imr_ifindex = greqs.gsr_interface;
1064 err = ip_mc_join_group_ssm(sk, &mreq, MCAST_INCLUDE);
1065 if (err && err != -EADDRINUSE)
1066 break;
1067 greqs.gsr_interface = mreq.imr_ifindex;
1068 omode = MCAST_INCLUDE;
1069 add = 1;
1070 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
1071 omode = MCAST_INCLUDE;
1072 add = 0;
1073 }
1074 err = ip_mc_source(add, omode, sk, &mreqs,
1075 greqs.gsr_interface);
1076 break;
1077 }
1078 case MCAST_MSFILTER:
1079 {
1080 struct sockaddr_in *psin;
1081 struct ip_msfilter *msf = NULL;
1082 struct group_filter *gsf = NULL;
1083 int msize, i, ifindex;
1084
1085 if (optlen < GROUP_FILTER_SIZE(0))
1086 goto e_inval;
1087 if (optlen > sysctl_optmem_max) {
1088 err = -ENOBUFS;
1089 break;
1090 }
1091 gsf = memdup_user(optval, optlen);
1092 if (IS_ERR(gsf)) {
1093 err = PTR_ERR(gsf);
1094 break;
1095 }
1096
1097 /* numsrc >= (4G-140)/128 overflow in 32 bits */
1098 if (gsf->gf_numsrc >= 0x1ffffff ||
1099 gsf->gf_numsrc > net->ipv4.sysctl_igmp_max_msf) {
1100 err = -ENOBUFS;
1101 goto mc_msf_out;
1102 }
1103 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
1104 err = -EINVAL;
1105 goto mc_msf_out;
1106 }
1107 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
1108 msf = kmalloc(msize, GFP_KERNEL);
1109 if (!msf) {
1110 err = -ENOBUFS;
1111 goto mc_msf_out;
1112 }
1113 ifindex = gsf->gf_interface;
1114 psin = (struct sockaddr_in *)&gsf->gf_group;
1115 if (psin->sin_family != AF_INET) {
1116 err = -EADDRNOTAVAIL;
1117 goto mc_msf_out;
1118 }
1119 msf->imsf_multiaddr = psin->sin_addr.s_addr;
1120 msf->imsf_interface = 0;
1121 msf->imsf_fmode = gsf->gf_fmode;
1122 msf->imsf_numsrc = gsf->gf_numsrc;
1123 err = -EADDRNOTAVAIL;
1124 for (i = 0; i < gsf->gf_numsrc; ++i) {
1125 psin = (struct sockaddr_in *)&gsf->gf_slist[i];
1126
1127 if (psin->sin_family != AF_INET)
1128 goto mc_msf_out;
1129 msf->imsf_slist[i] = psin->sin_addr.s_addr;
1130 }
1131 kfree(gsf);
1132 gsf = NULL;
1133
1134 err = ip_mc_msfilter(sk, msf, ifindex);
1135mc_msf_out:
1136 kfree(msf);
1137 kfree(gsf);
1138 break;
1139 }
1140 case IP_MULTICAST_ALL:
1141 if (optlen < 1)
1142 goto e_inval;
1143 if (val != 0 && val != 1)
1144 goto e_inval;
1145 inet->mc_all = val;
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
1190e_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 */
1206void 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 struct rtable *rt = skb_rtable(skb);
1223 bool l3slave = ipv4_l3mdev_skb(IPCB(skb)->flags);
1224
1225 if (pktinfo->ipi_ifindex == LOOPBACK_IFINDEX)
1226 pktinfo->ipi_ifindex = inet_iif(skb);
1227 else if (l3slave && rt && rt->rt_iif)
1228 pktinfo->ipi_ifindex = rt->rt_iif;
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
1238int 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#if IS_ENABLED(CONFIG_BPFILTER_UMH)
1248 if (optname >= BPFILTER_IPT_SO_SET_REPLACE &&
1249 optname < BPFILTER_IPT_SET_MAX)
1250 err = bpfilter_ip_set_sockopt(sk, optname, optval, optlen);
1251#endif
1252#ifdef CONFIG_NETFILTER
1253 /* we need to exclude all possible ENOPROTOOPTs except default case */
1254 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
1255 optname != IP_IPSEC_POLICY &&
1256 optname != IP_XFRM_POLICY &&
1257 !ip_mroute_opt(optname))
1258 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
1259#endif
1260 return err;
1261}
1262EXPORT_SYMBOL(ip_setsockopt);
1263
1264#ifdef CONFIG_COMPAT
1265int 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 err = compat_nf_setsockopt(sk, PF_INET, optname, optval,
1285 optlen);
1286#endif
1287 return err;
1288}
1289EXPORT_SYMBOL(compat_ip_setsockopt);
1290#endif
1291
1292/*
1293 * Get the options. Note for future reference. The GET of IP options gets
1294 * the _received_ ones. The set sets the _sent_ ones.
1295 */
1296
1297static bool getsockopt_needs_rtnl(int optname)
1298{
1299 switch (optname) {
1300 case IP_MSFILTER:
1301 case MCAST_MSFILTER:
1302 return true;
1303 }
1304 return false;
1305}
1306
1307static int do_ip_getsockopt(struct sock *sk, int level, int optname,
1308 char __user *optval, int __user *optlen, unsigned int flags)
1309{
1310 struct inet_sock *inet = inet_sk(sk);
1311 bool needs_rtnl = getsockopt_needs_rtnl(optname);
1312 int val, err = 0;
1313 int len;
1314
1315 if (level != SOL_IP)
1316 return -EOPNOTSUPP;
1317
1318 if (ip_mroute_opt(optname))
1319 return ip_mroute_getsockopt(sk, optname, optval, optlen);
1320
1321 if (get_user(len, optlen))
1322 return -EFAULT;
1323 if (len < 0)
1324 return -EINVAL;
1325
1326 if (needs_rtnl)
1327 rtnl_lock();
1328 lock_sock(sk);
1329
1330 switch (optname) {
1331 case IP_OPTIONS:
1332 {
1333 unsigned char optbuf[sizeof(struct ip_options)+40];
1334 struct ip_options *opt = (struct ip_options *)optbuf;
1335 struct ip_options_rcu *inet_opt;
1336
1337 inet_opt = rcu_dereference_protected(inet->inet_opt,
1338 lockdep_sock_is_held(sk));
1339 opt->optlen = 0;
1340 if (inet_opt)
1341 memcpy(optbuf, &inet_opt->opt,
1342 sizeof(struct ip_options) +
1343 inet_opt->opt.optlen);
1344 release_sock(sk);
1345
1346 if (opt->optlen == 0)
1347 return put_user(0, optlen);
1348
1349 ip_options_undo(opt);
1350
1351 len = min_t(unsigned int, len, opt->optlen);
1352 if (put_user(len, optlen))
1353 return -EFAULT;
1354 if (copy_to_user(optval, opt->__data, len))
1355 return -EFAULT;
1356 return 0;
1357 }
1358 case IP_PKTINFO:
1359 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
1360 break;
1361 case IP_RECVTTL:
1362 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
1363 break;
1364 case IP_RECVTOS:
1365 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
1366 break;
1367 case IP_RECVOPTS:
1368 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
1369 break;
1370 case IP_RETOPTS:
1371 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
1372 break;
1373 case IP_PASSSEC:
1374 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
1375 break;
1376 case IP_RECVORIGDSTADDR:
1377 val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0;
1378 break;
1379 case IP_CHECKSUM:
1380 val = (inet->cmsg_flags & IP_CMSG_CHECKSUM) != 0;
1381 break;
1382 case IP_RECVFRAGSIZE:
1383 val = (inet->cmsg_flags & IP_CMSG_RECVFRAGSIZE) != 0;
1384 break;
1385 case IP_TOS:
1386 val = inet->tos;
1387 break;
1388 case IP_TTL:
1389 {
1390 struct net *net = sock_net(sk);
1391 val = (inet->uc_ttl == -1 ?
1392 net->ipv4.sysctl_ip_default_ttl :
1393 inet->uc_ttl);
1394 break;
1395 }
1396 case IP_HDRINCL:
1397 val = inet->hdrincl;
1398 break;
1399 case IP_NODEFRAG:
1400 val = inet->nodefrag;
1401 break;
1402 case IP_BIND_ADDRESS_NO_PORT:
1403 val = inet->bind_address_no_port;
1404 break;
1405 case IP_MTU_DISCOVER:
1406 val = inet->pmtudisc;
1407 break;
1408 case IP_MTU:
1409 {
1410 struct dst_entry *dst;
1411 val = 0;
1412 dst = sk_dst_get(sk);
1413 if (dst) {
1414 val = dst_mtu(dst);
1415 dst_release(dst);
1416 }
1417 if (!val) {
1418 release_sock(sk);
1419 return -ENOTCONN;
1420 }
1421 break;
1422 }
1423 case IP_RECVERR:
1424 val = inet->recverr;
1425 break;
1426 case IP_MULTICAST_TTL:
1427 val = inet->mc_ttl;
1428 break;
1429 case IP_MULTICAST_LOOP:
1430 val = inet->mc_loop;
1431 break;
1432 case IP_UNICAST_IF:
1433 val = (__force int)htonl((__u32) inet->uc_index);
1434 break;
1435 case IP_MULTICAST_IF:
1436 {
1437 struct in_addr addr;
1438 len = min_t(unsigned int, len, sizeof(struct in_addr));
1439 addr.s_addr = inet->mc_addr;
1440 release_sock(sk);
1441
1442 if (put_user(len, optlen))
1443 return -EFAULT;
1444 if (copy_to_user(optval, &addr, len))
1445 return -EFAULT;
1446 return 0;
1447 }
1448 case IP_MSFILTER:
1449 {
1450 struct ip_msfilter msf;
1451
1452 if (len < IP_MSFILTER_SIZE(0)) {
1453 err = -EINVAL;
1454 goto out;
1455 }
1456 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
1457 err = -EFAULT;
1458 goto out;
1459 }
1460 err = ip_mc_msfget(sk, &msf,
1461 (struct ip_msfilter __user *)optval, optlen);
1462 goto out;
1463 }
1464 case MCAST_MSFILTER:
1465 {
1466 struct group_filter gsf;
1467
1468 if (len < GROUP_FILTER_SIZE(0)) {
1469 err = -EINVAL;
1470 goto out;
1471 }
1472 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
1473 err = -EFAULT;
1474 goto out;
1475 }
1476 err = ip_mc_gsfget(sk, &gsf,
1477 (struct group_filter __user *)optval,
1478 optlen);
1479 goto out;
1480 }
1481 case IP_MULTICAST_ALL:
1482 val = inet->mc_all;
1483 break;
1484 case IP_PKTOPTIONS:
1485 {
1486 struct msghdr msg;
1487
1488 release_sock(sk);
1489
1490 if (sk->sk_type != SOCK_STREAM)
1491 return -ENOPROTOOPT;
1492
1493 msg.msg_control = (__force void *) optval;
1494 msg.msg_controllen = len;
1495 msg.msg_flags = flags;
1496
1497 if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
1498 struct in_pktinfo info;
1499
1500 info.ipi_addr.s_addr = inet->inet_rcv_saddr;
1501 info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr;
1502 info.ipi_ifindex = inet->mc_index;
1503 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
1504 }
1505 if (inet->cmsg_flags & IP_CMSG_TTL) {
1506 int hlim = inet->mc_ttl;
1507 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
1508 }
1509 if (inet->cmsg_flags & IP_CMSG_TOS) {
1510 int tos = inet->rcv_tos;
1511 put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos);
1512 }
1513 len -= msg.msg_controllen;
1514 return put_user(len, optlen);
1515 }
1516 case IP_FREEBIND:
1517 val = inet->freebind;
1518 break;
1519 case IP_TRANSPARENT:
1520 val = inet->transparent;
1521 break;
1522 case IP_MINTTL:
1523 val = inet->min_ttl;
1524 break;
1525 default:
1526 release_sock(sk);
1527 return -ENOPROTOOPT;
1528 }
1529 release_sock(sk);
1530
1531 if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) {
1532 unsigned char ucval = (unsigned char)val;
1533 len = 1;
1534 if (put_user(len, optlen))
1535 return -EFAULT;
1536 if (copy_to_user(optval, &ucval, 1))
1537 return -EFAULT;
1538 } else {
1539 len = min_t(unsigned int, sizeof(int), len);
1540 if (put_user(len, optlen))
1541 return -EFAULT;
1542 if (copy_to_user(optval, &val, len))
1543 return -EFAULT;
1544 }
1545 return 0;
1546
1547out:
1548 release_sock(sk);
1549 if (needs_rtnl)
1550 rtnl_unlock();
1551 return err;
1552}
1553
1554int ip_getsockopt(struct sock *sk, int level,
1555 int optname, char __user *optval, int __user *optlen)
1556{
1557 int err;
1558
1559 err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0);
1560#if IS_ENABLED(CONFIG_BPFILTER_UMH)
1561 if (optname >= BPFILTER_IPT_SO_GET_INFO &&
1562 optname < BPFILTER_IPT_GET_MAX)
1563 err = bpfilter_ip_get_sockopt(sk, optname, optval, optlen);
1564#endif
1565#ifdef CONFIG_NETFILTER
1566 /* we need to exclude all possible ENOPROTOOPTs except default case */
1567 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1568 !ip_mroute_opt(optname)) {
1569 int len;
1570
1571 if (get_user(len, optlen))
1572 return -EFAULT;
1573
1574 err = nf_getsockopt(sk, PF_INET, optname, optval, &len);
1575 if (err >= 0)
1576 err = put_user(len, optlen);
1577 return err;
1578 }
1579#endif
1580 return err;
1581}
1582EXPORT_SYMBOL(ip_getsockopt);
1583
1584#ifdef CONFIG_COMPAT
1585int compat_ip_getsockopt(struct sock *sk, int level, int optname,
1586 char __user *optval, int __user *optlen)
1587{
1588 int err;
1589
1590 if (optname == MCAST_MSFILTER)
1591 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1592 ip_getsockopt);
1593
1594 err = do_ip_getsockopt(sk, level, optname, optval, optlen,
1595 MSG_CMSG_COMPAT);
1596
1597#if IS_ENABLED(CONFIG_BPFILTER_UMH)
1598 if (optname >= BPFILTER_IPT_SO_GET_INFO &&
1599 optname < BPFILTER_IPT_GET_MAX)
1600 err = bpfilter_ip_get_sockopt(sk, optname, optval, optlen);
1601#endif
1602#ifdef CONFIG_NETFILTER
1603 /* we need to exclude all possible ENOPROTOOPTs except default case */
1604 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1605 !ip_mroute_opt(optname)) {
1606 int len;
1607
1608 if (get_user(len, optlen))
1609 return -EFAULT;
1610
1611 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
1612 if (err >= 0)
1613 err = put_user(len, optlen);
1614 return err;
1615 }
1616#endif
1617 return err;
1618}
1619EXPORT_SYMBOL(compat_ip_getsockopt);
1620#endif
1621