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TOMOYO Linux Cross Reference
Linux/net/ipv4/ip_sockglue.c

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  1 /*
  2  * INET         An implementation of the TCP/IP protocol suite for the LINUX
  3  *              operating system.  INET is implemented using the  BSD Socket
  4  *              interface as the means of communication with the user level.
  5  *
  6  *              The IP to API glue.
  7  *
  8  * Authors:     see ip.c
  9  *
 10  * Fixes:
 11  *              Many            :       Split from ip.c , see ip.c for history.
 12  *              Martin Mares    :       TOS setting fixed.
 13  *              Alan Cox        :       Fixed a couple of oopses in Martin's
 14  *                                      TOS tweaks.
 15  *              Mike McLagan    :       Routing by source
 16  */
 17 
 18 #include <linux/module.h>
 19 #include <linux/types.h>
 20 #include <linux/mm.h>
 21 #include <linux/skbuff.h>
 22 #include <linux/ip.h>
 23 #include <linux/icmp.h>
 24 #include <linux/inetdevice.h>
 25 #include <linux/netdevice.h>
 26 #include <linux/slab.h>
 27 #include <net/sock.h>
 28 #include <net/ip.h>
 29 #include <net/icmp.h>
 30 #include <net/tcp_states.h>
 31 #include <linux/udp.h>
 32 #include <linux/igmp.h>
 33 #include <linux/netfilter.h>
 34 #include <linux/route.h>
 35 #include <linux/mroute.h>
 36 #include <net/inet_ecn.h>
 37 #include <net/route.h>
 38 #include <net/xfrm.h>
 39 #include <net/compat.h>
 40 #include <net/checksum.h>
 41 #if IS_ENABLED(CONFIG_IPV6)
 42 #include <net/transp_v6.h>
 43 #endif
 44 #include <net/ip_fib.h>
 45 
 46 #include <linux/errqueue.h>
 47 #include <asm/uaccess.h>
 48 
 49 /*
 50  *      SOL_IP control messages.
 51  */
 52 
 53 static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb)
 54 {
 55         struct in_pktinfo info = *PKTINFO_SKB_CB(skb);
 56 
 57         info.ipi_addr.s_addr = ip_hdr(skb)->daddr;
 58 
 59         put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
 60 }
 61 
 62 static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb)
 63 {
 64         int ttl = ip_hdr(skb)->ttl;
 65         put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl);
 66 }
 67 
 68 static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb)
 69 {
 70         put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos);
 71 }
 72 
 73 static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb)
 74 {
 75         if (IPCB(skb)->opt.optlen == 0)
 76                 return;
 77 
 78         put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen,
 79                  ip_hdr(skb) + 1);
 80 }
 81 
 82 
 83 static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb)
 84 {
 85         unsigned char optbuf[sizeof(struct ip_options) + 40];
 86         struct ip_options *opt = (struct ip_options *)optbuf;
 87 
 88         if (IPCB(skb)->opt.optlen == 0)
 89                 return;
 90 
 91         if (ip_options_echo(opt, skb)) {
 92                 msg->msg_flags |= MSG_CTRUNC;
 93                 return;
 94         }
 95         ip_options_undo(opt);
 96 
 97         put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data);
 98 }
 99 
100 static void ip_cmsg_recv_checksum(struct msghdr *msg, struct sk_buff *skb,
101                                   int offset)
102 {
103         __wsum csum = skb->csum;
104 
105         if (skb->ip_summed != CHECKSUM_COMPLETE)
106                 return;
107 
108         if (offset != 0)
109                 csum = csum_sub(csum, csum_partial(skb_transport_header(skb),
110                                                    offset, 0));
111 
112         put_cmsg(msg, SOL_IP, IP_CHECKSUM, sizeof(__wsum), &csum);
113 }
114 
115 static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
116 {
117         char *secdata;
118         u32 seclen, secid;
119         int err;
120 
121         err = security_socket_getpeersec_dgram(NULL, skb, &secid);
122         if (err)
123                 return;
124 
125         err = security_secid_to_secctx(secid, &secdata, &seclen);
126         if (err)
127                 return;
128 
129         put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata);
130         security_release_secctx(secdata, seclen);
131 }
132 
133 static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb)
134 {
135         struct sockaddr_in sin;
136         const struct iphdr *iph = ip_hdr(skb);
137         __be16 *ports = (__be16 *)skb_transport_header(skb);
138 
139         if (skb_transport_offset(skb) + 4 > skb->len)
140                 return;
141 
142         /* All current transport protocols have the port numbers in the
143          * first four bytes of the transport header and this function is
144          * written with this assumption in mind.
145          */
146 
147         sin.sin_family = AF_INET;
148         sin.sin_addr.s_addr = iph->daddr;
149         sin.sin_port = ports[1];
150         memset(sin.sin_zero, 0, sizeof(sin.sin_zero));
151 
152         put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin);
153 }
154 
155 void ip_cmsg_recv_offset(struct msghdr *msg, struct sk_buff *skb,
156                          int offset)
157 {
158         struct inet_sock *inet = inet_sk(skb->sk);
159         unsigned int flags = inet->cmsg_flags;
160 
161         /* Ordered by supposed usage frequency */
162         if (flags & IP_CMSG_PKTINFO) {
163                 ip_cmsg_recv_pktinfo(msg, skb);
164 
165                 flags &= ~IP_CMSG_PKTINFO;
166                 if (!flags)
167                         return;
168         }
169 
170         if (flags & IP_CMSG_TTL) {
171                 ip_cmsg_recv_ttl(msg, skb);
172 
173                 flags &= ~IP_CMSG_TTL;
174                 if (!flags)
175                         return;
176         }
177 
178         if (flags & IP_CMSG_TOS) {
179                 ip_cmsg_recv_tos(msg, skb);
180 
181                 flags &= ~IP_CMSG_TOS;
182                 if (!flags)
183                         return;
184         }
185 
186         if (flags & IP_CMSG_RECVOPTS) {
187                 ip_cmsg_recv_opts(msg, skb);
188 
189                 flags &= ~IP_CMSG_RECVOPTS;
190                 if (!flags)
191                         return;
192         }
193 
194         if (flags & IP_CMSG_RETOPTS) {
195                 ip_cmsg_recv_retopts(msg, skb);
196 
197                 flags &= ~IP_CMSG_RETOPTS;
198                 if (!flags)
199                         return;
200         }
201 
202         if (flags & IP_CMSG_PASSSEC) {
203                 ip_cmsg_recv_security(msg, skb);
204 
205                 flags &= ~IP_CMSG_PASSSEC;
206                 if (!flags)
207                         return;
208         }
209 
210         if (flags & IP_CMSG_ORIGDSTADDR) {
211                 ip_cmsg_recv_dstaddr(msg, skb);
212 
213                 flags &= ~IP_CMSG_ORIGDSTADDR;
214                 if (!flags)
215                         return;
216         }
217 
218         if (flags & IP_CMSG_CHECKSUM)
219                 ip_cmsg_recv_checksum(msg, skb, offset);
220 }
221 EXPORT_SYMBOL(ip_cmsg_recv_offset);
222 
223 int ip_cmsg_send(struct sock *sk, struct msghdr *msg, struct ipcm_cookie *ipc,
224                  bool allow_ipv6)
225 {
226         int err, val;
227         struct cmsghdr *cmsg;
228         struct net *net = sock_net(sk);
229 
230         for_each_cmsghdr(cmsg, msg) {
231                 if (!CMSG_OK(msg, cmsg))
232                         return -EINVAL;
233 #if IS_ENABLED(CONFIG_IPV6)
234                 if (allow_ipv6 &&
235                     cmsg->cmsg_level == SOL_IPV6 &&
236                     cmsg->cmsg_type == IPV6_PKTINFO) {
237                         struct in6_pktinfo *src_info;
238 
239                         if (cmsg->cmsg_len < CMSG_LEN(sizeof(*src_info)))
240                                 return -EINVAL;
241                         src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
242                         if (!ipv6_addr_v4mapped(&src_info->ipi6_addr))
243                                 return -EINVAL;
244                         ipc->oif = src_info->ipi6_ifindex;
245                         ipc->addr = src_info->ipi6_addr.s6_addr32[3];
246                         continue;
247                 }
248 #endif
249                 if (cmsg->cmsg_level == SOL_SOCKET) {
250                         err = __sock_cmsg_send(sk, msg, cmsg, &ipc->sockc);
251                         if (err)
252                                 return err;
253                         continue;
254                 }
255 
256                 if (cmsg->cmsg_level != SOL_IP)
257                         continue;
258                 switch (cmsg->cmsg_type) {
259                 case IP_RETOPTS:
260                         err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
261 
262                         /* Our caller is responsible for freeing ipc->opt */
263                         err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg),
264                                              err < 40 ? err : 40);
265                         if (err)
266                                 return err;
267                         break;
268                 case IP_PKTINFO:
269                 {
270                         struct in_pktinfo *info;
271                         if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
272                                 return -EINVAL;
273                         info = (struct in_pktinfo *)CMSG_DATA(cmsg);
274                         ipc->oif = info->ipi_ifindex;
275                         ipc->addr = info->ipi_spec_dst.s_addr;
276                         break;
277                 }
278                 case IP_TTL:
279                         if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
280                                 return -EINVAL;
281                         val = *(int *)CMSG_DATA(cmsg);
282                         if (val < 1 || val > 255)
283                                 return -EINVAL;
284                         ipc->ttl = val;
285                         break;
286                 case IP_TOS:
287                         if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
288                                 return -EINVAL;
289                         val = *(int *)CMSG_DATA(cmsg);
290                         if (val < 0 || val > 255)
291                                 return -EINVAL;
292                         ipc->tos = val;
293                         ipc->priority = rt_tos2priority(ipc->tos);
294                         break;
295 
296                 default:
297                         return -EINVAL;
298                 }
299         }
300         return 0;
301 }
302 
303 
304 /* Special input handler for packets caught by router alert option.
305    They are selected only by protocol field, and then processed likely
306    local ones; but only if someone wants them! Otherwise, router
307    not running rsvpd will kill RSVP.
308 
309    It is user level problem, what it will make with them.
310    I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
311    but receiver should be enough clever f.e. to forward mtrace requests,
312    sent to multicast group to reach destination designated router.
313  */
314 struct ip_ra_chain __rcu *ip_ra_chain;
315 static DEFINE_SPINLOCK(ip_ra_lock);
316 
317 
318 static void ip_ra_destroy_rcu(struct rcu_head *head)
319 {
320         struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu);
321 
322         sock_put(ra->saved_sk);
323         kfree(ra);
324 }
325 
326 int ip_ra_control(struct sock *sk, unsigned char on,
327                   void (*destructor)(struct sock *))
328 {
329         struct ip_ra_chain *ra, *new_ra;
330         struct ip_ra_chain __rcu **rap;
331 
332         if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW)
333                 return -EINVAL;
334 
335         new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
336 
337         spin_lock_bh(&ip_ra_lock);
338         for (rap = &ip_ra_chain;
339              (ra = rcu_dereference_protected(*rap,
340                         lockdep_is_held(&ip_ra_lock))) != NULL;
341              rap = &ra->next) {
342                 if (ra->sk == sk) {
343                         if (on) {
344                                 spin_unlock_bh(&ip_ra_lock);
345                                 kfree(new_ra);
346                                 return -EADDRINUSE;
347                         }
348                         /* dont let ip_call_ra_chain() use sk again */
349                         ra->sk = NULL;
350                         RCU_INIT_POINTER(*rap, ra->next);
351                         spin_unlock_bh(&ip_ra_lock);
352 
353                         if (ra->destructor)
354                                 ra->destructor(sk);
355                         /*
356                          * Delay sock_put(sk) and kfree(ra) after one rcu grace
357                          * period. This guarantee ip_call_ra_chain() dont need
358                          * to mess with socket refcounts.
359                          */
360                         ra->saved_sk = sk;
361                         call_rcu(&ra->rcu, ip_ra_destroy_rcu);
362                         return 0;
363                 }
364         }
365         if (!new_ra) {
366                 spin_unlock_bh(&ip_ra_lock);
367                 return -ENOBUFS;
368         }
369         new_ra->sk = sk;
370         new_ra->destructor = destructor;
371 
372         RCU_INIT_POINTER(new_ra->next, ra);
373         rcu_assign_pointer(*rap, new_ra);
374         sock_hold(sk);
375         spin_unlock_bh(&ip_ra_lock);
376 
377         return 0;
378 }
379 
380 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
381                    __be16 port, u32 info, u8 *payload)
382 {
383         struct sock_exterr_skb *serr;
384 
385         skb = skb_clone(skb, GFP_ATOMIC);
386         if (!skb)
387                 return;
388 
389         serr = SKB_EXT_ERR(skb);
390         serr->ee.ee_errno = err;
391         serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
392         serr->ee.ee_type = icmp_hdr(skb)->type;
393         serr->ee.ee_code = icmp_hdr(skb)->code;
394         serr->ee.ee_pad = 0;
395         serr->ee.ee_info = info;
396         serr->ee.ee_data = 0;
397         serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) -
398                                    skb_network_header(skb);
399         serr->port = port;
400 
401         if (skb_pull(skb, payload - skb->data)) {
402                 skb_reset_transport_header(skb);
403                 if (sock_queue_err_skb(sk, skb) == 0)
404                         return;
405         }
406         kfree_skb(skb);
407 }
408 
409 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info)
410 {
411         struct inet_sock *inet = inet_sk(sk);
412         struct sock_exterr_skb *serr;
413         struct iphdr *iph;
414         struct sk_buff *skb;
415 
416         if (!inet->recverr)
417                 return;
418 
419         skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
420         if (!skb)
421                 return;
422 
423         skb_put(skb, sizeof(struct iphdr));
424         skb_reset_network_header(skb);
425         iph = ip_hdr(skb);
426         iph->daddr = daddr;
427 
428         serr = SKB_EXT_ERR(skb);
429         serr->ee.ee_errno = err;
430         serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
431         serr->ee.ee_type = 0;
432         serr->ee.ee_code = 0;
433         serr->ee.ee_pad = 0;
434         serr->ee.ee_info = info;
435         serr->ee.ee_data = 0;
436         serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
437         serr->port = port;
438 
439         __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
440         skb_reset_transport_header(skb);
441 
442         if (sock_queue_err_skb(sk, skb))
443                 kfree_skb(skb);
444 }
445 
446 /* For some errors we have valid addr_offset even with zero payload and
447  * zero port. Also, addr_offset should be supported if port is set.
448  */
449 static inline bool ipv4_datagram_support_addr(struct sock_exterr_skb *serr)
450 {
451         return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
452                serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port;
453 }
454 
455 /* IPv4 supports cmsg on all imcp errors and some timestamps
456  *
457  * Timestamp code paths do not initialize the fields expected by cmsg:
458  * the PKTINFO fields in skb->cb[]. Fill those in here.
459  */
460 static bool ipv4_datagram_support_cmsg(const struct sock *sk,
461                                        struct sk_buff *skb,
462                                        int ee_origin)
463 {
464         struct in_pktinfo *info;
465 
466         if (ee_origin == SO_EE_ORIGIN_ICMP)
467                 return true;
468 
469         if (ee_origin == SO_EE_ORIGIN_LOCAL)
470                 return false;
471 
472         /* Support IP_PKTINFO on tstamp packets if requested, to correlate
473          * timestamp with egress dev. Not possible for packets without dev
474          * or without payload (SOF_TIMESTAMPING_OPT_TSONLY).
475          */
476         if ((!(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_CMSG)) ||
477             (!skb->dev))
478                 return false;
479 
480         info = PKTINFO_SKB_CB(skb);
481         info->ipi_spec_dst.s_addr = ip_hdr(skb)->saddr;
482         info->ipi_ifindex = skb->dev->ifindex;
483         return true;
484 }
485 
486 /*
487  *      Handle MSG_ERRQUEUE
488  */
489 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
490 {
491         struct sock_exterr_skb *serr;
492         struct sk_buff *skb;
493         DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name);
494         struct {
495                 struct sock_extended_err ee;
496                 struct sockaddr_in       offender;
497         } errhdr;
498         int err;
499         int copied;
500 
501         WARN_ON_ONCE(sk->sk_family == AF_INET6);
502 
503         err = -EAGAIN;
504         skb = sock_dequeue_err_skb(sk);
505         if (!skb)
506                 goto out;
507 
508         copied = skb->len;
509         if (copied > len) {
510                 msg->msg_flags |= MSG_TRUNC;
511                 copied = len;
512         }
513         err = skb_copy_datagram_msg(skb, 0, msg, copied);
514         if (unlikely(err)) {
515                 kfree_skb(skb);
516                 return err;
517         }
518         sock_recv_timestamp(msg, sk, skb);
519 
520         serr = SKB_EXT_ERR(skb);
521 
522         if (sin && ipv4_datagram_support_addr(serr)) {
523                 sin->sin_family = AF_INET;
524                 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) +
525                                                    serr->addr_offset);
526                 sin->sin_port = serr->port;
527                 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
528                 *addr_len = sizeof(*sin);
529         }
530 
531         memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
532         sin = &errhdr.offender;
533         memset(sin, 0, sizeof(*sin));
534 
535         if (ipv4_datagram_support_cmsg(sk, skb, serr->ee.ee_origin)) {
536                 sin->sin_family = AF_INET;
537                 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
538                 if (inet_sk(sk)->cmsg_flags)
539                         ip_cmsg_recv(msg, skb);
540         }
541 
542         put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
543 
544         /* Now we could try to dump offended packet options */
545 
546         msg->msg_flags |= MSG_ERRQUEUE;
547         err = copied;
548 
549         consume_skb(skb);
550 out:
551         return err;
552 }
553 
554 
555 /*
556  *      Socket option code for IP. This is the end of the line after any
557  *      TCP,UDP etc options on an IP socket.
558  */
559 static bool setsockopt_needs_rtnl(int optname)
560 {
561         switch (optname) {
562         case IP_ADD_MEMBERSHIP:
563         case IP_ADD_SOURCE_MEMBERSHIP:
564         case IP_BLOCK_SOURCE:
565         case IP_DROP_MEMBERSHIP:
566         case IP_DROP_SOURCE_MEMBERSHIP:
567         case IP_MSFILTER:
568         case IP_UNBLOCK_SOURCE:
569         case MCAST_BLOCK_SOURCE:
570         case MCAST_MSFILTER:
571         case MCAST_JOIN_GROUP:
572         case MCAST_JOIN_SOURCE_GROUP:
573         case MCAST_LEAVE_GROUP:
574         case MCAST_LEAVE_SOURCE_GROUP:
575         case MCAST_UNBLOCK_SOURCE:
576                 return true;
577         }
578         return false;
579 }
580 
581 static int do_ip_setsockopt(struct sock *sk, int level,
582                             int optname, char __user *optval, unsigned int optlen)
583 {
584         struct inet_sock *inet = inet_sk(sk);
585         struct net *net = sock_net(sk);
586         int val = 0, err;
587         bool needs_rtnl = setsockopt_needs_rtnl(optname);
588 
589         switch (optname) {
590         case IP_PKTINFO:
591         case IP_RECVTTL:
592         case IP_RECVOPTS:
593         case IP_RECVTOS:
594         case IP_RETOPTS:
595         case IP_TOS:
596         case IP_TTL:
597         case IP_HDRINCL:
598         case IP_MTU_DISCOVER:
599         case IP_RECVERR:
600         case IP_ROUTER_ALERT:
601         case IP_FREEBIND:
602         case IP_PASSSEC:
603         case IP_TRANSPARENT:
604         case IP_MINTTL:
605         case IP_NODEFRAG:
606         case IP_BIND_ADDRESS_NO_PORT:
607         case IP_UNICAST_IF:
608         case IP_MULTICAST_TTL:
609         case IP_MULTICAST_ALL:
610         case IP_MULTICAST_LOOP:
611         case IP_RECVORIGDSTADDR:
612         case IP_CHECKSUM:
613                 if (optlen >= sizeof(int)) {
614                         if (get_user(val, (int __user *) optval))
615                                 return -EFAULT;
616                 } else if (optlen >= sizeof(char)) {
617                         unsigned char ucval;
618 
619                         if (get_user(ucval, (unsigned char __user *) optval))
620                                 return -EFAULT;
621                         val = (int) ucval;
622                 }
623         }
624 
625         /* If optlen==0, it is equivalent to val == 0 */
626 
627         if (ip_mroute_opt(optname))
628                 return ip_mroute_setsockopt(sk, optname, optval, optlen);
629 
630         err = 0;
631         if (needs_rtnl)
632                 rtnl_lock();
633         lock_sock(sk);
634 
635         switch (optname) {
636         case IP_OPTIONS:
637         {
638                 struct ip_options_rcu *old, *opt = NULL;
639 
640                 if (optlen > 40)
641                         goto e_inval;
642                 err = ip_options_get_from_user(sock_net(sk), &opt,
643                                                optval, optlen);
644                 if (err)
645                         break;
646                 old = rcu_dereference_protected(inet->inet_opt,
647                                                 lockdep_sock_is_held(sk));
648                 if (inet->is_icsk) {
649                         struct inet_connection_sock *icsk = inet_csk(sk);
650 #if IS_ENABLED(CONFIG_IPV6)
651                         if (sk->sk_family == PF_INET ||
652                             (!((1 << sk->sk_state) &
653                                (TCPF_LISTEN | TCPF_CLOSE)) &&
654                              inet->inet_daddr != LOOPBACK4_IPV6)) {
655 #endif
656                                 if (old)
657                                         icsk->icsk_ext_hdr_len -= old->opt.optlen;
658                                 if (opt)
659                                         icsk->icsk_ext_hdr_len += opt->opt.optlen;
660                                 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
661 #if IS_ENABLED(CONFIG_IPV6)
662                         }
663 #endif
664                 }
665                 rcu_assign_pointer(inet->inet_opt, opt);
666                 if (old)
667                         kfree_rcu(old, rcu);
668                 break;
669         }
670         case IP_PKTINFO:
671                 if (val)
672                         inet->cmsg_flags |= IP_CMSG_PKTINFO;
673                 else
674                         inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
675                 break;
676         case IP_RECVTTL:
677                 if (val)
678                         inet->cmsg_flags |=  IP_CMSG_TTL;
679                 else
680                         inet->cmsg_flags &= ~IP_CMSG_TTL;
681                 break;
682         case IP_RECVTOS:
683                 if (val)
684                         inet->cmsg_flags |=  IP_CMSG_TOS;
685                 else
686                         inet->cmsg_flags &= ~IP_CMSG_TOS;
687                 break;
688         case IP_RECVOPTS:
689                 if (val)
690                         inet->cmsg_flags |=  IP_CMSG_RECVOPTS;
691                 else
692                         inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
693                 break;
694         case IP_RETOPTS:
695                 if (val)
696                         inet->cmsg_flags |= IP_CMSG_RETOPTS;
697                 else
698                         inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
699                 break;
700         case IP_PASSSEC:
701                 if (val)
702                         inet->cmsg_flags |= IP_CMSG_PASSSEC;
703                 else
704                         inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
705                 break;
706         case IP_RECVORIGDSTADDR:
707                 if (val)
708                         inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR;
709                 else
710                         inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR;
711                 break;
712         case IP_CHECKSUM:
713                 if (val) {
714                         if (!(inet->cmsg_flags & IP_CMSG_CHECKSUM)) {
715                                 inet_inc_convert_csum(sk);
716                                 inet->cmsg_flags |= IP_CMSG_CHECKSUM;
717                         }
718                 } else {
719                         if (inet->cmsg_flags & IP_CMSG_CHECKSUM) {
720                                 inet_dec_convert_csum(sk);
721                                 inet->cmsg_flags &= ~IP_CMSG_CHECKSUM;
722                         }
723                 }
724                 break;
725         case IP_TOS:    /* This sets both TOS and Precedence */
726                 if (sk->sk_type == SOCK_STREAM) {
727                         val &= ~INET_ECN_MASK;
728                         val |= inet->tos & INET_ECN_MASK;
729                 }
730                 if (inet->tos != val) {
731                         inet->tos = val;
732                         sk->sk_priority = rt_tos2priority(val);
733                         sk_dst_reset(sk);
734                 }
735                 break;
736         case IP_TTL:
737                 if (optlen < 1)
738                         goto e_inval;
739                 if (val != -1 && (val < 1 || val > 255))
740                         goto e_inval;
741                 inet->uc_ttl = val;
742                 break;
743         case IP_HDRINCL:
744                 if (sk->sk_type != SOCK_RAW) {
745                         err = -ENOPROTOOPT;
746                         break;
747                 }
748                 inet->hdrincl = val ? 1 : 0;
749                 break;
750         case IP_NODEFRAG:
751                 if (sk->sk_type != SOCK_RAW) {
752                         err = -ENOPROTOOPT;
753                         break;
754                 }
755                 inet->nodefrag = val ? 1 : 0;
756                 break;
757         case IP_BIND_ADDRESS_NO_PORT:
758                 inet->bind_address_no_port = val ? 1 : 0;
759                 break;
760         case IP_MTU_DISCOVER:
761                 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_OMIT)
762                         goto e_inval;
763                 inet->pmtudisc = val;
764                 break;
765         case IP_RECVERR:
766                 inet->recverr = !!val;
767                 if (!val)
768                         skb_queue_purge(&sk->sk_error_queue);
769                 break;
770         case IP_MULTICAST_TTL:
771                 if (sk->sk_type == SOCK_STREAM)
772                         goto e_inval;
773                 if (optlen < 1)
774                         goto e_inval;
775                 if (val == -1)
776                         val = 1;
777                 if (val < 0 || val > 255)
778                         goto e_inval;
779                 inet->mc_ttl = val;
780                 break;
781         case IP_MULTICAST_LOOP:
782                 if (optlen < 1)
783                         goto e_inval;
784                 inet->mc_loop = !!val;
785                 break;
786         case IP_UNICAST_IF:
787         {
788                 struct net_device *dev = NULL;
789                 int ifindex;
790 
791                 if (optlen != sizeof(int))
792                         goto e_inval;
793 
794                 ifindex = (__force int)ntohl((__force __be32)val);
795                 if (ifindex == 0) {
796                         inet->uc_index = 0;
797                         err = 0;
798                         break;
799                 }
800 
801                 dev = dev_get_by_index(sock_net(sk), ifindex);
802                 err = -EADDRNOTAVAIL;
803                 if (!dev)
804                         break;
805                 dev_put(dev);
806 
807                 err = -EINVAL;
808                 if (sk->sk_bound_dev_if)
809                         break;
810 
811                 inet->uc_index = ifindex;
812                 err = 0;
813                 break;
814         }
815         case IP_MULTICAST_IF:
816         {
817                 struct ip_mreqn mreq;
818                 struct net_device *dev = NULL;
819 
820                 if (sk->sk_type == SOCK_STREAM)
821                         goto e_inval;
822                 /*
823                  *      Check the arguments are allowable
824                  */
825 
826                 if (optlen < sizeof(struct in_addr))
827                         goto e_inval;
828 
829                 err = -EFAULT;
830                 if (optlen >= sizeof(struct ip_mreqn)) {
831                         if (copy_from_user(&mreq, optval, sizeof(mreq)))
832                                 break;
833                 } else {
834                         memset(&mreq, 0, sizeof(mreq));
835                         if (optlen >= sizeof(struct ip_mreq)) {
836                                 if (copy_from_user(&mreq, optval,
837                                                    sizeof(struct ip_mreq)))
838                                         break;
839                         } else if (optlen >= sizeof(struct in_addr)) {
840                                 if (copy_from_user(&mreq.imr_address, optval,
841                                                    sizeof(struct in_addr)))
842                                         break;
843                         }
844                 }
845 
846                 if (!mreq.imr_ifindex) {
847                         if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) {
848                                 inet->mc_index = 0;
849                                 inet->mc_addr  = 0;
850                                 err = 0;
851                                 break;
852                         }
853                         dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr);
854                         if (dev)
855                                 mreq.imr_ifindex = dev->ifindex;
856                 } else
857                         dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex);
858 
859 
860                 err = -EADDRNOTAVAIL;
861                 if (!dev)
862                         break;
863                 dev_put(dev);
864 
865                 err = -EINVAL;
866                 if (sk->sk_bound_dev_if &&
867                     mreq.imr_ifindex != sk->sk_bound_dev_if)
868                         break;
869 
870                 inet->mc_index = mreq.imr_ifindex;
871                 inet->mc_addr  = mreq.imr_address.s_addr;
872                 err = 0;
873                 break;
874         }
875 
876         case IP_ADD_MEMBERSHIP:
877         case IP_DROP_MEMBERSHIP:
878         {
879                 struct ip_mreqn mreq;
880 
881                 err = -EPROTO;
882                 if (inet_sk(sk)->is_icsk)
883                         break;
884 
885                 if (optlen < sizeof(struct ip_mreq))
886                         goto e_inval;
887                 err = -EFAULT;
888                 if (optlen >= sizeof(struct ip_mreqn)) {
889                         if (copy_from_user(&mreq, optval, sizeof(mreq)))
890                                 break;
891                 } else {
892                         memset(&mreq, 0, sizeof(mreq));
893                         if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq)))
894                                 break;
895                 }
896 
897                 if (optname == IP_ADD_MEMBERSHIP)
898                         err = ip_mc_join_group(sk, &mreq);
899                 else
900                         err = ip_mc_leave_group(sk, &mreq);
901                 break;
902         }
903         case IP_MSFILTER:
904         {
905                 struct ip_msfilter *msf;
906 
907                 if (optlen < IP_MSFILTER_SIZE(0))
908                         goto e_inval;
909                 if (optlen > sysctl_optmem_max) {
910                         err = -ENOBUFS;
911                         break;
912                 }
913                 msf = kmalloc(optlen, GFP_KERNEL);
914                 if (!msf) {
915                         err = -ENOBUFS;
916                         break;
917                 }
918                 err = -EFAULT;
919                 if (copy_from_user(msf, optval, optlen)) {
920                         kfree(msf);
921                         break;
922                 }
923                 /* numsrc >= (1G-4) overflow in 32 bits */
924                 if (msf->imsf_numsrc >= 0x3ffffffcU ||
925                     msf->imsf_numsrc > net->ipv4.sysctl_igmp_max_msf) {
926                         kfree(msf);
927                         err = -ENOBUFS;
928                         break;
929                 }
930                 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
931                         kfree(msf);
932                         err = -EINVAL;
933                         break;
934                 }
935                 err = ip_mc_msfilter(sk, msf, 0);
936                 kfree(msf);
937                 break;
938         }
939         case IP_BLOCK_SOURCE:
940         case IP_UNBLOCK_SOURCE:
941         case IP_ADD_SOURCE_MEMBERSHIP:
942         case IP_DROP_SOURCE_MEMBERSHIP:
943         {
944                 struct ip_mreq_source mreqs;
945                 int omode, add;
946 
947                 if (optlen != sizeof(struct ip_mreq_source))
948                         goto e_inval;
949                 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
950                         err = -EFAULT;
951                         break;
952                 }
953                 if (optname == IP_BLOCK_SOURCE) {
954                         omode = MCAST_EXCLUDE;
955                         add = 1;
956                 } else if (optname == IP_UNBLOCK_SOURCE) {
957                         omode = MCAST_EXCLUDE;
958                         add = 0;
959                 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
960                         struct ip_mreqn mreq;
961 
962                         mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
963                         mreq.imr_address.s_addr = mreqs.imr_interface;
964                         mreq.imr_ifindex = 0;
965                         err = ip_mc_join_group(sk, &mreq);
966                         if (err && err != -EADDRINUSE)
967                                 break;
968                         omode = MCAST_INCLUDE;
969                         add = 1;
970                 } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
971                         omode = MCAST_INCLUDE;
972                         add = 0;
973                 }
974                 err = ip_mc_source(add, omode, sk, &mreqs, 0);
975                 break;
976         }
977         case MCAST_JOIN_GROUP:
978         case MCAST_LEAVE_GROUP:
979         {
980                 struct group_req greq;
981                 struct sockaddr_in *psin;
982                 struct ip_mreqn mreq;
983 
984                 if (optlen < sizeof(struct group_req))
985                         goto e_inval;
986                 err = -EFAULT;
987                 if (copy_from_user(&greq, optval, sizeof(greq)))
988                         break;
989                 psin = (struct sockaddr_in *)&greq.gr_group;
990                 if (psin->sin_family != AF_INET)
991                         goto e_inval;
992                 memset(&mreq, 0, sizeof(mreq));
993                 mreq.imr_multiaddr = psin->sin_addr;
994                 mreq.imr_ifindex = greq.gr_interface;
995 
996                 if (optname == MCAST_JOIN_GROUP)
997                         err = ip_mc_join_group(sk, &mreq);
998                 else
999                         err = ip_mc_leave_group(sk, &mreq);
1000                 break;
1001         }
1002         case MCAST_JOIN_SOURCE_GROUP:
1003         case MCAST_LEAVE_SOURCE_GROUP:
1004         case MCAST_BLOCK_SOURCE:
1005         case MCAST_UNBLOCK_SOURCE:
1006         {
1007                 struct group_source_req greqs;
1008                 struct ip_mreq_source mreqs;
1009                 struct sockaddr_in *psin;
1010                 int omode, add;
1011 
1012                 if (optlen != sizeof(struct group_source_req))
1013                         goto e_inval;
1014                 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
1015                         err = -EFAULT;
1016                         break;
1017                 }
1018                 if (greqs.gsr_group.ss_family != AF_INET ||
1019                     greqs.gsr_source.ss_family != AF_INET) {
1020                         err = -EADDRNOTAVAIL;
1021                         break;
1022                 }
1023                 psin = (struct sockaddr_in *)&greqs.gsr_group;
1024                 mreqs.imr_multiaddr = psin->sin_addr.s_addr;
1025                 psin = (struct sockaddr_in *)&greqs.gsr_source;
1026                 mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
1027                 mreqs.imr_interface = 0; /* use index for mc_source */
1028 
1029                 if (optname == MCAST_BLOCK_SOURCE) {
1030                         omode = MCAST_EXCLUDE;
1031                         add = 1;
1032                 } else if (optname == MCAST_UNBLOCK_SOURCE) {
1033                         omode = MCAST_EXCLUDE;
1034                         add = 0;
1035                 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
1036                         struct ip_mreqn mreq;
1037 
1038                         psin = (struct sockaddr_in *)&greqs.gsr_group;
1039                         mreq.imr_multiaddr = psin->sin_addr;
1040                         mreq.imr_address.s_addr = 0;
1041                         mreq.imr_ifindex = greqs.gsr_interface;
1042                         err = ip_mc_join_group(sk, &mreq);
1043                         if (err && err != -EADDRINUSE)
1044                                 break;
1045                         greqs.gsr_interface = mreq.imr_ifindex;
1046                         omode = MCAST_INCLUDE;
1047                         add = 1;
1048                 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
1049                         omode = MCAST_INCLUDE;
1050                         add = 0;
1051                 }
1052                 err = ip_mc_source(add, omode, sk, &mreqs,
1053                                    greqs.gsr_interface);
1054                 break;
1055         }
1056         case MCAST_MSFILTER:
1057         {
1058                 struct sockaddr_in *psin;
1059                 struct ip_msfilter *msf = NULL;
1060                 struct group_filter *gsf = NULL;
1061                 int msize, i, ifindex;
1062 
1063                 if (optlen < GROUP_FILTER_SIZE(0))
1064                         goto e_inval;
1065                 if (optlen > sysctl_optmem_max) {
1066                         err = -ENOBUFS;
1067                         break;
1068                 }
1069                 gsf = kmalloc(optlen, GFP_KERNEL);
1070                 if (!gsf) {
1071                         err = -ENOBUFS;
1072                         break;
1073                 }
1074                 err = -EFAULT;
1075                 if (copy_from_user(gsf, optval, optlen))
1076                         goto mc_msf_out;
1077 
1078                 /* numsrc >= (4G-140)/128 overflow in 32 bits */
1079                 if (gsf->gf_numsrc >= 0x1ffffff ||
1080                     gsf->gf_numsrc > net->ipv4.sysctl_igmp_max_msf) {
1081                         err = -ENOBUFS;
1082                         goto mc_msf_out;
1083                 }
1084                 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
1085                         err = -EINVAL;
1086                         goto mc_msf_out;
1087                 }
1088                 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
1089                 msf = kmalloc(msize, GFP_KERNEL);
1090                 if (!msf) {
1091                         err = -ENOBUFS;
1092                         goto mc_msf_out;
1093                 }
1094                 ifindex = gsf->gf_interface;
1095                 psin = (struct sockaddr_in *)&gsf->gf_group;
1096                 if (psin->sin_family != AF_INET) {
1097                         err = -EADDRNOTAVAIL;
1098                         goto mc_msf_out;
1099                 }
1100                 msf->imsf_multiaddr = psin->sin_addr.s_addr;
1101                 msf->imsf_interface = 0;
1102                 msf->imsf_fmode = gsf->gf_fmode;
1103                 msf->imsf_numsrc = gsf->gf_numsrc;
1104                 err = -EADDRNOTAVAIL;
1105                 for (i = 0; i < gsf->gf_numsrc; ++i) {
1106                         psin = (struct sockaddr_in *)&gsf->gf_slist[i];
1107 
1108                         if (psin->sin_family != AF_INET)
1109                                 goto mc_msf_out;
1110                         msf->imsf_slist[i] = psin->sin_addr.s_addr;
1111                 }
1112                 kfree(gsf);
1113                 gsf = NULL;
1114 
1115                 err = ip_mc_msfilter(sk, msf, ifindex);
1116 mc_msf_out:
1117                 kfree(msf);
1118                 kfree(gsf);
1119                 break;
1120         }
1121         case IP_MULTICAST_ALL:
1122                 if (optlen < 1)
1123                         goto e_inval;
1124                 if (val != 0 && val != 1)
1125                         goto e_inval;
1126                 inet->mc_all = val;
1127                 break;
1128         case IP_ROUTER_ALERT:
1129                 err = ip_ra_control(sk, val ? 1 : 0, NULL);
1130                 break;
1131 
1132         case IP_FREEBIND:
1133                 if (optlen < 1)
1134                         goto e_inval;
1135                 inet->freebind = !!val;
1136                 break;
1137 
1138         case IP_IPSEC_POLICY:
1139         case IP_XFRM_POLICY:
1140                 err = -EPERM;
1141                 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1142                         break;
1143                 err = xfrm_user_policy(sk, optname, optval, optlen);
1144                 break;
1145 
1146         case IP_TRANSPARENT:
1147                 if (!!val && !ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) &&
1148                     !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
1149                         err = -EPERM;
1150                         break;
1151                 }
1152                 if (optlen < 1)
1153                         goto e_inval;
1154                 inet->transparent = !!val;
1155                 break;
1156 
1157         case IP_MINTTL:
1158                 if (optlen < 1)
1159                         goto e_inval;
1160                 if (val < 0 || val > 255)
1161                         goto e_inval;
1162                 inet->min_ttl = val;
1163                 break;
1164 
1165         default:
1166                 err = -ENOPROTOOPT;
1167                 break;
1168         }
1169         release_sock(sk);
1170         if (needs_rtnl)
1171                 rtnl_unlock();
1172         return err;
1173 
1174 e_inval:
1175         release_sock(sk);
1176         if (needs_rtnl)
1177                 rtnl_unlock();
1178         return -EINVAL;
1179 }
1180 
1181 /**
1182  * ipv4_pktinfo_prepare - transfer some info from rtable to skb
1183  * @sk: socket
1184  * @skb: buffer
1185  *
1186  * To support IP_CMSG_PKTINFO option, we store rt_iif and specific
1187  * destination in skb->cb[] before dst drop.
1188  * This way, receiver doesn't make cache line misses to read rtable.
1189  */
1190 void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb)
1191 {
1192         struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb);
1193         bool prepare = (inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) ||
1194                        ipv6_sk_rxinfo(sk);
1195 
1196         if (prepare && skb_rtable(skb)) {
1197                 /* skb->cb is overloaded: prior to this point it is IP{6}CB
1198                  * which has interface index (iif) as the first member of the
1199                  * underlying inet{6}_skb_parm struct. This code then overlays
1200                  * PKTINFO_SKB_CB and in_pktinfo also has iif as the first
1201                  * element so the iif is picked up from the prior IPCB
1202                  */
1203                 pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb);
1204         } else {
1205                 pktinfo->ipi_ifindex = 0;
1206                 pktinfo->ipi_spec_dst.s_addr = 0;
1207         }
1208         skb_dst_drop(skb);
1209 }
1210 
1211 int ip_setsockopt(struct sock *sk, int level,
1212                 int optname, char __user *optval, unsigned int optlen)
1213 {
1214         int err;
1215 
1216         if (level != SOL_IP)
1217                 return -ENOPROTOOPT;
1218 
1219         err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1220 #ifdef CONFIG_NETFILTER
1221         /* we need to exclude all possible ENOPROTOOPTs except default case */
1222         if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
1223                         optname != IP_IPSEC_POLICY &&
1224                         optname != IP_XFRM_POLICY &&
1225                         !ip_mroute_opt(optname)) {
1226                 lock_sock(sk);
1227                 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
1228                 release_sock(sk);
1229         }
1230 #endif
1231         return err;
1232 }
1233 EXPORT_SYMBOL(ip_setsockopt);
1234 
1235 #ifdef CONFIG_COMPAT
1236 int compat_ip_setsockopt(struct sock *sk, int level, int optname,
1237                          char __user *optval, unsigned int optlen)
1238 {
1239         int err;
1240 
1241         if (level != SOL_IP)
1242                 return -ENOPROTOOPT;
1243 
1244         if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
1245                 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
1246                         ip_setsockopt);
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 = compat_nf_setsockopt(sk, PF_INET, optname,
1257                                            optval, optlen);
1258                 release_sock(sk);
1259         }
1260 #endif
1261         return err;
1262 }
1263 EXPORT_SYMBOL(compat_ip_setsockopt);
1264 #endif
1265 
1266 /*
1267  *      Get the options. Note for future reference. The GET of IP options gets
1268  *      the _received_ ones. The set sets the _sent_ ones.
1269  */
1270 
1271 static bool getsockopt_needs_rtnl(int optname)
1272 {
1273         switch (optname) {
1274         case IP_MSFILTER:
1275         case MCAST_MSFILTER:
1276                 return true;
1277         }
1278         return false;
1279 }
1280 
1281 static int do_ip_getsockopt(struct sock *sk, int level, int optname,
1282                             char __user *optval, int __user *optlen, unsigned int flags)
1283 {
1284         struct inet_sock *inet = inet_sk(sk);
1285         bool needs_rtnl = getsockopt_needs_rtnl(optname);
1286         int val, err = 0;
1287         int len;
1288 
1289         if (level != SOL_IP)
1290                 return -EOPNOTSUPP;
1291 
1292         if (ip_mroute_opt(optname))
1293                 return ip_mroute_getsockopt(sk, optname, optval, optlen);
1294 
1295         if (get_user(len, optlen))
1296                 return -EFAULT;
1297         if (len < 0)
1298                 return -EINVAL;
1299 
1300         if (needs_rtnl)
1301                 rtnl_lock();
1302         lock_sock(sk);
1303 
1304         switch (optname) {
1305         case IP_OPTIONS:
1306         {
1307                 unsigned char optbuf[sizeof(struct ip_options)+40];
1308                 struct ip_options *opt = (struct ip_options *)optbuf;
1309                 struct ip_options_rcu *inet_opt;
1310 
1311                 inet_opt = rcu_dereference_protected(inet->inet_opt,
1312                                                      lockdep_sock_is_held(sk));
1313                 opt->optlen = 0;
1314                 if (inet_opt)
1315                         memcpy(optbuf, &inet_opt->opt,
1316                                sizeof(struct ip_options) +
1317                                inet_opt->opt.optlen);
1318                 release_sock(sk);
1319 
1320                 if (opt->optlen == 0)
1321                         return put_user(0, optlen);
1322 
1323                 ip_options_undo(opt);
1324 
1325                 len = min_t(unsigned int, len, opt->optlen);
1326                 if (put_user(len, optlen))
1327                         return -EFAULT;
1328                 if (copy_to_user(optval, opt->__data, len))
1329                         return -EFAULT;
1330                 return 0;
1331         }
1332         case IP_PKTINFO:
1333                 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
1334                 break;
1335         case IP_RECVTTL:
1336                 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
1337                 break;
1338         case IP_RECVTOS:
1339                 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
1340                 break;
1341         case IP_RECVOPTS:
1342                 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
1343                 break;
1344         case IP_RETOPTS:
1345                 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
1346                 break;
1347         case IP_PASSSEC:
1348                 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
1349                 break;
1350         case IP_RECVORIGDSTADDR:
1351                 val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0;
1352                 break;
1353         case IP_CHECKSUM:
1354                 val = (inet->cmsg_flags & IP_CMSG_CHECKSUM) != 0;
1355                 break;
1356         case IP_TOS:
1357                 val = inet->tos;
1358                 break;
1359         case IP_TTL:
1360         {
1361                 struct net *net = sock_net(sk);
1362                 val = (inet->uc_ttl == -1 ?
1363                        net->ipv4.sysctl_ip_default_ttl :
1364                        inet->uc_ttl);
1365                 break;
1366         }
1367         case IP_HDRINCL:
1368                 val = inet->hdrincl;
1369                 break;
1370         case IP_NODEFRAG:
1371                 val = inet->nodefrag;
1372                 break;
1373         case IP_BIND_ADDRESS_NO_PORT:
1374                 val = inet->bind_address_no_port;
1375                 break;
1376         case IP_MTU_DISCOVER:
1377                 val = inet->pmtudisc;
1378                 break;
1379         case IP_MTU:
1380         {
1381                 struct dst_entry *dst;
1382                 val = 0;
1383                 dst = sk_dst_get(sk);
1384                 if (dst) {
1385                         val = dst_mtu(dst);
1386                         dst_release(dst);
1387                 }
1388                 if (!val) {
1389                         release_sock(sk);
1390                         return -ENOTCONN;
1391                 }
1392                 break;
1393         }
1394         case IP_RECVERR:
1395                 val = inet->recverr;
1396                 break;
1397         case IP_MULTICAST_TTL:
1398                 val = inet->mc_ttl;
1399                 break;
1400         case IP_MULTICAST_LOOP:
1401                 val = inet->mc_loop;
1402                 break;
1403         case IP_UNICAST_IF:
1404                 val = (__force int)htonl((__u32) inet->uc_index);
1405                 break;
1406         case IP_MULTICAST_IF:
1407         {
1408                 struct in_addr addr;
1409                 len = min_t(unsigned int, len, sizeof(struct in_addr));
1410                 addr.s_addr = inet->mc_addr;
1411                 release_sock(sk);
1412 
1413                 if (put_user(len, optlen))
1414                         return -EFAULT;
1415                 if (copy_to_user(optval, &addr, len))
1416                         return -EFAULT;
1417                 return 0;
1418         }
1419         case IP_MSFILTER:
1420         {
1421                 struct ip_msfilter msf;
1422 
1423                 if (len < IP_MSFILTER_SIZE(0)) {
1424                         err = -EINVAL;
1425                         goto out;
1426                 }
1427                 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
1428                         err = -EFAULT;
1429                         goto out;
1430                 }
1431                 err = ip_mc_msfget(sk, &msf,
1432                                    (struct ip_msfilter __user *)optval, optlen);
1433                 goto out;
1434         }
1435         case MCAST_MSFILTER:
1436         {
1437                 struct group_filter gsf;
1438 
1439                 if (len < GROUP_FILTER_SIZE(0)) {
1440                         err = -EINVAL;
1441                         goto out;
1442                 }
1443                 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
1444                         err = -EFAULT;
1445                         goto out;
1446                 }
1447                 err = ip_mc_gsfget(sk, &gsf,
1448                                    (struct group_filter __user *)optval,
1449                                    optlen);
1450                 goto out;
1451         }
1452         case IP_MULTICAST_ALL:
1453                 val = inet->mc_all;
1454                 break;
1455         case IP_PKTOPTIONS:
1456         {
1457                 struct msghdr msg;
1458 
1459                 release_sock(sk);
1460 
1461                 if (sk->sk_type != SOCK_STREAM)
1462                         return -ENOPROTOOPT;
1463 
1464                 msg.msg_control = (__force void *) optval;
1465                 msg.msg_controllen = len;
1466                 msg.msg_flags = flags;
1467 
1468                 if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
1469                         struct in_pktinfo info;
1470 
1471                         info.ipi_addr.s_addr = inet->inet_rcv_saddr;
1472                         info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr;
1473                         info.ipi_ifindex = inet->mc_index;
1474                         put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
1475                 }
1476                 if (inet->cmsg_flags & IP_CMSG_TTL) {
1477                         int hlim = inet->mc_ttl;
1478                         put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
1479                 }
1480                 if (inet->cmsg_flags & IP_CMSG_TOS) {
1481                         int tos = inet->rcv_tos;
1482                         put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos);
1483                 }
1484                 len -= msg.msg_controllen;
1485                 return put_user(len, optlen);
1486         }
1487         case IP_FREEBIND:
1488                 val = inet->freebind;
1489                 break;
1490         case IP_TRANSPARENT:
1491                 val = inet->transparent;
1492                 break;
1493         case IP_MINTTL:
1494                 val = inet->min_ttl;
1495                 break;
1496         default:
1497                 release_sock(sk);
1498                 return -ENOPROTOOPT;
1499         }
1500         release_sock(sk);
1501 
1502         if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) {
1503                 unsigned char ucval = (unsigned char)val;
1504                 len = 1;
1505                 if (put_user(len, optlen))
1506                         return -EFAULT;
1507                 if (copy_to_user(optval, &ucval, 1))
1508                         return -EFAULT;
1509         } else {
1510                 len = min_t(unsigned int, sizeof(int), len);
1511                 if (put_user(len, optlen))
1512                         return -EFAULT;
1513                 if (copy_to_user(optval, &val, len))
1514                         return -EFAULT;
1515         }
1516         return 0;
1517 
1518 out:
1519         release_sock(sk);
1520         if (needs_rtnl)
1521                 rtnl_unlock();
1522         return err;
1523 }
1524 
1525 int ip_getsockopt(struct sock *sk, int level,
1526                   int optname, char __user *optval, int __user *optlen)
1527 {
1528         int err;
1529 
1530         err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0);
1531 #ifdef CONFIG_NETFILTER
1532         /* we need to exclude all possible ENOPROTOOPTs except default case */
1533         if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1534                         !ip_mroute_opt(optname)) {
1535                 int len;
1536 
1537                 if (get_user(len, optlen))
1538                         return -EFAULT;
1539 
1540                 lock_sock(sk);
1541                 err = nf_getsockopt(sk, PF_INET, optname, optval,
1542                                 &len);
1543                 release_sock(sk);
1544                 if (err >= 0)
1545                         err = put_user(len, optlen);
1546                 return err;
1547         }
1548 #endif
1549         return err;
1550 }
1551 EXPORT_SYMBOL(ip_getsockopt);
1552 
1553 #ifdef CONFIG_COMPAT
1554 int compat_ip_getsockopt(struct sock *sk, int level, int optname,
1555                          char __user *optval, int __user *optlen)
1556 {
1557         int err;
1558 
1559         if (optname == MCAST_MSFILTER)
1560                 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1561                         ip_getsockopt);
1562 
1563         err = do_ip_getsockopt(sk, level, optname, optval, optlen,
1564                 MSG_CMSG_COMPAT);
1565 
1566 #ifdef CONFIG_NETFILTER
1567         /* we need to exclude all possible ENOPROTOOPTs except default case */
1568         if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1569                         !ip_mroute_opt(optname)) {
1570                 int len;
1571 
1572                 if (get_user(len, optlen))
1573                         return -EFAULT;
1574 
1575                 lock_sock(sk);
1576                 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
1577                 release_sock(sk);
1578                 if (err >= 0)
1579                         err = put_user(len, optlen);
1580                 return err;
1581         }
1582 #endif
1583         return err;
1584 }
1585 EXPORT_SYMBOL(compat_ip_getsockopt);
1586 #endif
1587 

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