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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 #if IS_ENABLED(CONFIG_IPV6)
41 #include <net/transp_v6.h>
42 #endif
43 #include <net/ip_fib.h>
44 
45 #include <linux/errqueue.h>
46 #include <asm/uaccess.h>
47 
48 #define IP_CMSG_PKTINFO 1
49 #define IP_CMSG_TTL 2
50 #define IP_CMSG_TOS 4
51 #define IP_CMSG_RECVOPTS 8
52 #define IP_CMSG_RETOPTS 16
53 #define IP_CMSG_PASSSEC 32
54 #define IP_CMSG_ORIGDSTADDR 64
55 
56 /*
57  * SOL_IP control messages.
58  */
59 #define PKTINFO_SKB_CB(__skb) ((struct in_pktinfo *)((__skb)->cb))
60 
61 static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb)
62 {
63  struct in_pktinfo info = *PKTINFO_SKB_CB(skb);
64 
65  info.ipi_addr.s_addr = ip_hdr(skb)->daddr;
66 
67  put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
68 }
69 
70 static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb)
71 {
72  int ttl = ip_hdr(skb)->ttl;
73  put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl);
74 }
75 
76 static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb)
77 {
78  put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos);
79 }
80 
81 static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb)
82 {
83  if (IPCB(skb)->opt.optlen == 0)
84  return;
85 
86  put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen,
87  ip_hdr(skb) + 1);
88 }
89 
90 
91 static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb)
92 {
93  unsigned char optbuf[sizeof(struct ip_options) + 40];
94  struct ip_options *opt = (struct ip_options *)optbuf;
95 
96  if (IPCB(skb)->opt.optlen == 0)
97  return;
98 
99  if (ip_options_echo(opt, skb)) {
100  msg->msg_flags |= MSG_CTRUNC;
101  return;
102  }
103  ip_options_undo(opt);
104 
105  put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data);
106 }
107 
108 static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
109 {
110  char *secdata;
111  u32 seclen, secid;
112  int err;
113 
114  err = security_socket_getpeersec_dgram(NULL, skb, &secid);
115  if (err)
116  return;
117 
118  err = security_secid_to_secctx(secid, &secdata, &seclen);
119  if (err)
120  return;
121 
122  put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata);
123  security_release_secctx(secdata, seclen);
124 }
125 
126 static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb)
127 {
128  struct sockaddr_in sin;
129  const struct iphdr *iph = ip_hdr(skb);
130  __be16 *ports = (__be16 *)skb_transport_header(skb);
131 
132  if (skb_transport_offset(skb) + 4 > skb->len)
133  return;
134 
135  /* All current transport protocols have the port numbers in the
136  * first four bytes of the transport header and this function is
137  * written with this assumption in mind.
138  */
139 
140  sin.sin_family = AF_INET;
141  sin.sin_addr.s_addr = iph->daddr;
142  sin.sin_port = ports[1];
143  memset(sin.sin_zero, 0, sizeof(sin.sin_zero));
144 
145  put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin);
146 }
147 
148 void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
149 {
150  struct inet_sock *inet = inet_sk(skb->sk);
151  unsigned int flags = inet->cmsg_flags;
152 
153  /* Ordered by supposed usage frequency */
154  if (flags & 1)
155  ip_cmsg_recv_pktinfo(msg, skb);
156  if ((flags >>= 1) == 0)
157  return;
158 
159  if (flags & 1)
160  ip_cmsg_recv_ttl(msg, skb);
161  if ((flags >>= 1) == 0)
162  return;
163 
164  if (flags & 1)
165  ip_cmsg_recv_tos(msg, skb);
166  if ((flags >>= 1) == 0)
167  return;
168 
169  if (flags & 1)
170  ip_cmsg_recv_opts(msg, skb);
171  if ((flags >>= 1) == 0)
172  return;
173 
174  if (flags & 1)
175  ip_cmsg_recv_retopts(msg, skb);
176  if ((flags >>= 1) == 0)
177  return;
178 
179  if (flags & 1)
180  ip_cmsg_recv_security(msg, skb);
181 
182  if ((flags >>= 1) == 0)
183  return;
184  if (flags & 1)
185  ip_cmsg_recv_dstaddr(msg, skb);
186 
187 }
188 EXPORT_SYMBOL(ip_cmsg_recv);
189 
190 int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc)
191 {
192  int err;
193  struct cmsghdr *cmsg;
194 
195  for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
196  if (!CMSG_OK(msg, cmsg))
197  return -EINVAL;
198  if (cmsg->cmsg_level != SOL_IP)
199  continue;
200  switch (cmsg->cmsg_type) {
201  case IP_RETOPTS:
202  err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
203  err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg),
204  err < 40 ? err : 40);
205  if (err)
206  return err;
207  break;
208  case IP_PKTINFO:
209  {
210  struct in_pktinfo *info;
211  if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
212  return -EINVAL;
213  info = (struct in_pktinfo *)CMSG_DATA(cmsg);
214  ipc->oif = info->ipi_ifindex;
215  ipc->addr = info->ipi_spec_dst.s_addr;
216  break;
217  }
218  default:
219  return -EINVAL;
220  }
221  }
222  return 0;
223 }
224 
225 
226 /* Special input handler for packets caught by router alert option.
227  They are selected only by protocol field, and then processed likely
228  local ones; but only if someone wants them! Otherwise, router
229  not running rsvpd will kill RSVP.
230 
231  It is user level problem, what it will make with them.
232  I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
233  but receiver should be enough clever f.e. to forward mtrace requests,
234  sent to multicast group to reach destination designated router.
235  */
236 struct ip_ra_chain __rcu *ip_ra_chain;
237 static DEFINE_SPINLOCK(ip_ra_lock);
238 
239 
240 static void ip_ra_destroy_rcu(struct rcu_head *head)
241 {
242  struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu);
243 
244  sock_put(ra->saved_sk);
245  kfree(ra);
246 }
247 
248 int ip_ra_control(struct sock *sk, unsigned char on,
249  void (*destructor)(struct sock *))
250 {
251  struct ip_ra_chain *ra, *new_ra;
252  struct ip_ra_chain __rcu **rap;
253 
254  if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW)
255  return -EINVAL;
256 
257  new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
258 
259  spin_lock_bh(&ip_ra_lock);
260  for (rap = &ip_ra_chain;
261  (ra = rcu_dereference_protected(*rap,
262  lockdep_is_held(&ip_ra_lock))) != NULL;
263  rap = &ra->next) {
264  if (ra->sk == sk) {
265  if (on) {
266  spin_unlock_bh(&ip_ra_lock);
267  kfree(new_ra);
268  return -EADDRINUSE;
269  }
270  /* dont let ip_call_ra_chain() use sk again */
271  ra->sk = NULL;
272  rcu_assign_pointer(*rap, ra->next);
273  spin_unlock_bh(&ip_ra_lock);
274 
275  if (ra->destructor)
276  ra->destructor(sk);
277  /*
278  * Delay sock_put(sk) and kfree(ra) after one rcu grace
279  * period. This guarantee ip_call_ra_chain() dont need
280  * to mess with socket refcounts.
281  */
282  ra->saved_sk = sk;
283  call_rcu(&ra->rcu, ip_ra_destroy_rcu);
284  return 0;
285  }
286  }
287  if (new_ra == NULL) {
288  spin_unlock_bh(&ip_ra_lock);
289  return -ENOBUFS;
290  }
291  new_ra->sk = sk;
292  new_ra->destructor = destructor;
293 
294  new_ra->next = ra;
295  rcu_assign_pointer(*rap, new_ra);
296  sock_hold(sk);
297  spin_unlock_bh(&ip_ra_lock);
298 
299  return 0;
300 }
301 
302 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
303  __be16 port, u32 info, u8 *payload)
304 {
305  struct sock_exterr_skb *serr;
306 
307  skb = skb_clone(skb, GFP_ATOMIC);
308  if (!skb)
309  return;
310 
311  serr = SKB_EXT_ERR(skb);
312  serr->ee.ee_errno = err;
313  serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
314  serr->ee.ee_type = icmp_hdr(skb)->type;
315  serr->ee.ee_code = icmp_hdr(skb)->code;
316  serr->ee.ee_pad = 0;
317  serr->ee.ee_info = info;
318  serr->ee.ee_data = 0;
319  serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) -
320  skb_network_header(skb);
321  serr->port = port;
322 
323  if (skb_pull(skb, payload - skb->data) != NULL) {
324  skb_reset_transport_header(skb);
325  if (sock_queue_err_skb(sk, skb) == 0)
326  return;
327  }
328  kfree_skb(skb);
329 }
330 
331 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info)
332 {
333  struct inet_sock *inet = inet_sk(sk);
334  struct sock_exterr_skb *serr;
335  struct iphdr *iph;
336  struct sk_buff *skb;
337 
338  if (!inet->recverr)
339  return;
340 
341  skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
342  if (!skb)
343  return;
344 
345  skb_put(skb, sizeof(struct iphdr));
346  skb_reset_network_header(skb);
347  iph = ip_hdr(skb);
348  iph->daddr = daddr;
349 
350  serr = SKB_EXT_ERR(skb);
351  serr->ee.ee_errno = err;
352  serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
353  serr->ee.ee_type = 0;
354  serr->ee.ee_code = 0;
355  serr->ee.ee_pad = 0;
356  serr->ee.ee_info = info;
357  serr->ee.ee_data = 0;
358  serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
359  serr->port = port;
360 
361  __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
362  skb_reset_transport_header(skb);
363 
364  if (sock_queue_err_skb(sk, skb))
365  kfree_skb(skb);
366 }
367 
368 /*
369  * Handle MSG_ERRQUEUE
370  */
371 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len)
372 {
373  struct sock_exterr_skb *serr;
374  struct sk_buff *skb, *skb2;
375  struct sockaddr_in *sin;
376  struct {
377  struct sock_extended_err ee;
378  struct sockaddr_in offender;
379  } errhdr;
380  int err;
381  int copied;
382 
383  err = -EAGAIN;
384  skb = skb_dequeue(&sk->sk_error_queue);
385  if (skb == NULL)
386  goto out;
387 
388  copied = skb->len;
389  if (copied > len) {
390  msg->msg_flags |= MSG_TRUNC;
391  copied = len;
392  }
393  err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
394  if (err)
395  goto out_free_skb;
396 
397  sock_recv_timestamp(msg, sk, skb);
398 
399  serr = SKB_EXT_ERR(skb);
400 
401  sin = (struct sockaddr_in *)msg->msg_name;
402  if (sin) {
403  sin->sin_family = AF_INET;
404  sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) +
405  serr->addr_offset);
406  sin->sin_port = serr->port;
407  memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
408  }
409 
410  memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
411  sin = &errhdr.offender;
412  sin->sin_family = AF_UNSPEC;
413  if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) {
414  struct inet_sock *inet = inet_sk(sk);
415 
416  sin->sin_family = AF_INET;
417  sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
418  sin->sin_port = 0;
419  memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
420  if (inet->cmsg_flags)
421  ip_cmsg_recv(msg, skb);
422  }
423 
424  put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
425 
426  /* Now we could try to dump offended packet options */
427 
428  msg->msg_flags |= MSG_ERRQUEUE;
429  err = copied;
430 
431  /* Reset and regenerate socket error */
432  spin_lock_bh(&sk->sk_error_queue.lock);
433  sk->sk_err = 0;
434  skb2 = skb_peek(&sk->sk_error_queue);
435  if (skb2 != NULL) {
436  sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
437  spin_unlock_bh(&sk->sk_error_queue.lock);
438  sk->sk_error_report(sk);
439  } else
440  spin_unlock_bh(&sk->sk_error_queue.lock);
441 
442 out_free_skb:
443  kfree_skb(skb);
444 out:
445  return err;
446 }
447 
448 
449 /*
450  * Socket option code for IP. This is the end of the line after any
451  * TCP,UDP etc options on an IP socket.
452  */
453 
454 static int do_ip_setsockopt(struct sock *sk, int level,
455  int optname, char __user *optval, unsigned int optlen)
456 {
457  struct inet_sock *inet = inet_sk(sk);
458  int val = 0, err;
459 
460  switch (optname) {
461  case IP_PKTINFO:
462  case IP_RECVTTL:
463  case IP_RECVOPTS:
464  case IP_RECVTOS:
465  case IP_RETOPTS:
466  case IP_TOS:
467  case IP_TTL:
468  case IP_HDRINCL:
469  case IP_MTU_DISCOVER:
470  case IP_RECVERR:
471  case IP_ROUTER_ALERT:
472  case IP_FREEBIND:
473  case IP_PASSSEC:
474  case IP_TRANSPARENT:
475  case IP_MINTTL:
476  case IP_NODEFRAG:
477  case IP_UNICAST_IF:
478  case IP_MULTICAST_TTL:
479  case IP_MULTICAST_ALL:
480  case IP_MULTICAST_LOOP:
481  case IP_RECVORIGDSTADDR:
482  if (optlen >= sizeof(int)) {
483  if (get_user(val, (int __user *) optval))
484  return -EFAULT;
485  } else if (optlen >= sizeof(char)) {
486  unsigned char ucval;
487 
488  if (get_user(ucval, (unsigned char __user *) optval))
489  return -EFAULT;
490  val = (int) ucval;
491  }
492  }
493 
494  /* If optlen==0, it is equivalent to val == 0 */
495 
496  if (ip_mroute_opt(optname))
497  return ip_mroute_setsockopt(sk, optname, optval, optlen);
498 
499  err = 0;
500  lock_sock(sk);
501 
502  switch (optname) {
503  case IP_OPTIONS:
504  {
505  struct ip_options_rcu *old, *opt = NULL;
506 
507  if (optlen > 40)
508  goto e_inval;
509  err = ip_options_get_from_user(sock_net(sk), &opt,
510  optval, optlen);
511  if (err)
512  break;
513  old = rcu_dereference_protected(inet->inet_opt,
514  sock_owned_by_user(sk));
515  if (inet->is_icsk) {
516  struct inet_connection_sock *icsk = inet_csk(sk);
517 #if IS_ENABLED(CONFIG_IPV6)
518  if (sk->sk_family == PF_INET ||
519  (!((1 << sk->sk_state) &
520  (TCPF_LISTEN | TCPF_CLOSE)) &&
521  inet->inet_daddr != LOOPBACK4_IPV6)) {
522 #endif
523  if (old)
524  icsk->icsk_ext_hdr_len -= old->opt.optlen;
525  if (opt)
526  icsk->icsk_ext_hdr_len += opt->opt.optlen;
527  icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
528 #if IS_ENABLED(CONFIG_IPV6)
529  }
530 #endif
531  }
532  rcu_assign_pointer(inet->inet_opt, opt);
533  if (old)
534  kfree_rcu(old, rcu);
535  break;
536  }
537  case IP_PKTINFO:
538  if (val)
539  inet->cmsg_flags |= IP_CMSG_PKTINFO;
540  else
541  inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
542  break;
543  case IP_RECVTTL:
544  if (val)
545  inet->cmsg_flags |= IP_CMSG_TTL;
546  else
547  inet->cmsg_flags &= ~IP_CMSG_TTL;
548  break;
549  case IP_RECVTOS:
550  if (val)
551  inet->cmsg_flags |= IP_CMSG_TOS;
552  else
553  inet->cmsg_flags &= ~IP_CMSG_TOS;
554  break;
555  case IP_RECVOPTS:
556  if (val)
557  inet->cmsg_flags |= IP_CMSG_RECVOPTS;
558  else
559  inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
560  break;
561  case IP_RETOPTS:
562  if (val)
563  inet->cmsg_flags |= IP_CMSG_RETOPTS;
564  else
565  inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
566  break;
567  case IP_PASSSEC:
568  if (val)
569  inet->cmsg_flags |= IP_CMSG_PASSSEC;
570  else
571  inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
572  break;
573  case IP_RECVORIGDSTADDR:
574  if (val)
575  inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR;
576  else
577  inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR;
578  break;
579  case IP_TOS: /* This sets both TOS and Precedence */
580  if (sk->sk_type == SOCK_STREAM) {
581  val &= ~INET_ECN_MASK;
582  val |= inet->tos & INET_ECN_MASK;
583  }
584  if (inet->tos != val) {
585  inet->tos = val;
586  sk->sk_priority = rt_tos2priority(val);
587  sk_dst_reset(sk);
588  }
589  break;
590  case IP_TTL:
591  if (optlen < 1)
592  goto e_inval;
593  if (val != -1 && (val < 0 || val > 255))
594  goto e_inval;
595  inet->uc_ttl = val;
596  break;
597  case IP_HDRINCL:
598  if (sk->sk_type != SOCK_RAW) {
599  err = -ENOPROTOOPT;
600  break;
601  }
602  inet->hdrincl = val ? 1 : 0;
603  break;
604  case IP_NODEFRAG:
605  if (sk->sk_type != SOCK_RAW) {
606  err = -ENOPROTOOPT;
607  break;
608  }
609  inet->nodefrag = val ? 1 : 0;
610  break;
611  case IP_MTU_DISCOVER:
612  if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_PROBE)
613  goto e_inval;
614  inet->pmtudisc = val;
615  break;
616  case IP_RECVERR:
617  inet->recverr = !!val;
618  if (!val)
619  skb_queue_purge(&sk->sk_error_queue);
620  break;
621  case IP_MULTICAST_TTL:
622  if (sk->sk_type == SOCK_STREAM)
623  goto e_inval;
624  if (optlen < 1)
625  goto e_inval;
626  if (val == -1)
627  val = 1;
628  if (val < 0 || val > 255)
629  goto e_inval;
630  inet->mc_ttl = val;
631  break;
632  case IP_MULTICAST_LOOP:
633  if (optlen < 1)
634  goto e_inval;
635  inet->mc_loop = !!val;
636  break;
637  case IP_UNICAST_IF:
638  {
639  struct net_device *dev = NULL;
640  int ifindex;
641 
642  if (optlen != sizeof(int))
643  goto e_inval;
644 
645  ifindex = (__force int)ntohl((__force __be32)val);
646  if (ifindex == 0) {
647  inet->uc_index = 0;
648  err = 0;
649  break;
650  }
651 
652  dev = dev_get_by_index(sock_net(sk), ifindex);
653  err = -EADDRNOTAVAIL;
654  if (!dev)
655  break;
656  dev_put(dev);
657 
658  err = -EINVAL;
659  if (sk->sk_bound_dev_if)
660  break;
661 
662  inet->uc_index = ifindex;
663  err = 0;
664  break;
665  }
666  case IP_MULTICAST_IF:
667  {
668  struct ip_mreqn mreq;
669  struct net_device *dev = NULL;
670 
671  if (sk->sk_type == SOCK_STREAM)
672  goto e_inval;
673  /*
674  * Check the arguments are allowable
675  */
676 
677  if (optlen < sizeof(struct in_addr))
678  goto e_inval;
679 
680  err = -EFAULT;
681  if (optlen >= sizeof(struct ip_mreqn)) {
682  if (copy_from_user(&mreq, optval, sizeof(mreq)))
683  break;
684  } else {
685  memset(&mreq, 0, sizeof(mreq));
686  if (optlen >= sizeof(struct ip_mreq)) {
687  if (copy_from_user(&mreq, optval,
688  sizeof(struct ip_mreq)))
689  break;
690  } else if (optlen >= sizeof(struct in_addr)) {
691  if (copy_from_user(&mreq.imr_address, optval,
692  sizeof(struct in_addr)))
693  break;
694  }
695  }
696 
697  if (!mreq.imr_ifindex) {
698  if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) {
699  inet->mc_index = 0;
700  inet->mc_addr = 0;
701  err = 0;
702  break;
703  }
704  dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr);
705  if (dev)
706  mreq.imr_ifindex = dev->ifindex;
707  } else
708  dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex);
709 
710 
711  err = -EADDRNOTAVAIL;
712  if (!dev)
713  break;
714  dev_put(dev);
715 
716  err = -EINVAL;
717  if (sk->sk_bound_dev_if &&
718  mreq.imr_ifindex != sk->sk_bound_dev_if)
719  break;
720 
721  inet->mc_index = mreq.imr_ifindex;
722  inet->mc_addr = mreq.imr_address.s_addr;
723  err = 0;
724  break;
725  }
726 
727  case IP_ADD_MEMBERSHIP:
728  case IP_DROP_MEMBERSHIP:
729  {
730  struct ip_mreqn mreq;
731 
732  err = -EPROTO;
733  if (inet_sk(sk)->is_icsk)
734  break;
735 
736  if (optlen < sizeof(struct ip_mreq))
737  goto e_inval;
738  err = -EFAULT;
739  if (optlen >= sizeof(struct ip_mreqn)) {
740  if (copy_from_user(&mreq, optval, sizeof(mreq)))
741  break;
742  } else {
743  memset(&mreq, 0, sizeof(mreq));
744  if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq)))
745  break;
746  }
747 
748  if (optname == IP_ADD_MEMBERSHIP)
749  err = ip_mc_join_group(sk, &mreq);
750  else
751  err = ip_mc_leave_group(sk, &mreq);
752  break;
753  }
754  case IP_MSFILTER:
755  {
756  struct ip_msfilter *msf;
757 
758  if (optlen < IP_MSFILTER_SIZE(0))
759  goto e_inval;
760  if (optlen > sysctl_optmem_max) {
761  err = -ENOBUFS;
762  break;
763  }
764  msf = kmalloc(optlen, GFP_KERNEL);
765  if (!msf) {
766  err = -ENOBUFS;
767  break;
768  }
769  err = -EFAULT;
770  if (copy_from_user(msf, optval, optlen)) {
771  kfree(msf);
772  break;
773  }
774  /* numsrc >= (1G-4) overflow in 32 bits */
775  if (msf->imsf_numsrc >= 0x3ffffffcU ||
776  msf->imsf_numsrc > sysctl_igmp_max_msf) {
777  kfree(msf);
778  err = -ENOBUFS;
779  break;
780  }
781  if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
782  kfree(msf);
783  err = -EINVAL;
784  break;
785  }
786  err = ip_mc_msfilter(sk, msf, 0);
787  kfree(msf);
788  break;
789  }
790  case IP_BLOCK_SOURCE:
791  case IP_UNBLOCK_SOURCE:
792  case IP_ADD_SOURCE_MEMBERSHIP:
793  case IP_DROP_SOURCE_MEMBERSHIP:
794  {
795  struct ip_mreq_source mreqs;
796  int omode, add;
797 
798  if (optlen != sizeof(struct ip_mreq_source))
799  goto e_inval;
800  if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
801  err = -EFAULT;
802  break;
803  }
804  if (optname == IP_BLOCK_SOURCE) {
805  omode = MCAST_EXCLUDE;
806  add = 1;
807  } else if (optname == IP_UNBLOCK_SOURCE) {
808  omode = MCAST_EXCLUDE;
809  add = 0;
810  } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
811  struct ip_mreqn mreq;
812 
813  mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
814  mreq.imr_address.s_addr = mreqs.imr_interface;
815  mreq.imr_ifindex = 0;
816  err = ip_mc_join_group(sk, &mreq);
817  if (err && err != -EADDRINUSE)
818  break;
819  omode = MCAST_INCLUDE;
820  add = 1;
821  } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
822  omode = MCAST_INCLUDE;
823  add = 0;
824  }
825  err = ip_mc_source(add, omode, sk, &mreqs, 0);
826  break;
827  }
828  case MCAST_JOIN_GROUP:
829  case MCAST_LEAVE_GROUP:
830  {
831  struct group_req greq;
832  struct sockaddr_in *psin;
833  struct ip_mreqn mreq;
834 
835  if (optlen < sizeof(struct group_req))
836  goto e_inval;
837  err = -EFAULT;
838  if (copy_from_user(&greq, optval, sizeof(greq)))
839  break;
840  psin = (struct sockaddr_in *)&greq.gr_group;
841  if (psin->sin_family != AF_INET)
842  goto e_inval;
843  memset(&mreq, 0, sizeof(mreq));
844  mreq.imr_multiaddr = psin->sin_addr;
845  mreq.imr_ifindex = greq.gr_interface;
846 
847  if (optname == MCAST_JOIN_GROUP)
848  err = ip_mc_join_group(sk, &mreq);
849  else
850  err = ip_mc_leave_group(sk, &mreq);
851  break;
852  }
853  case MCAST_JOIN_SOURCE_GROUP:
854  case MCAST_LEAVE_SOURCE_GROUP:
855  case MCAST_BLOCK_SOURCE:
856  case MCAST_UNBLOCK_SOURCE:
857  {
858  struct group_source_req greqs;
859  struct ip_mreq_source mreqs;
860  struct sockaddr_in *psin;
861  int omode, add;
862 
863  if (optlen != sizeof(struct group_source_req))
864  goto e_inval;
865  if (copy_from_user(&greqs, optval, sizeof(greqs))) {
866  err = -EFAULT;
867  break;
868  }
869  if (greqs.gsr_group.ss_family != AF_INET ||
870  greqs.gsr_source.ss_family != AF_INET) {
871  err = -EADDRNOTAVAIL;
872  break;
873  }
874  psin = (struct sockaddr_in *)&greqs.gsr_group;
875  mreqs.imr_multiaddr = psin->sin_addr.s_addr;
876  psin = (struct sockaddr_in *)&greqs.gsr_source;
877  mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
878  mreqs.imr_interface = 0; /* use index for mc_source */
879 
880  if (optname == MCAST_BLOCK_SOURCE) {
881  omode = MCAST_EXCLUDE;
882  add = 1;
883  } else if (optname == MCAST_UNBLOCK_SOURCE) {
884  omode = MCAST_EXCLUDE;
885  add = 0;
886  } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
887  struct ip_mreqn mreq;
888 
889  psin = (struct sockaddr_in *)&greqs.gsr_group;
890  mreq.imr_multiaddr = psin->sin_addr;
891  mreq.imr_address.s_addr = 0;
892  mreq.imr_ifindex = greqs.gsr_interface;
893  err = ip_mc_join_group(sk, &mreq);
894  if (err && err != -EADDRINUSE)
895  break;
896  greqs.gsr_interface = mreq.imr_ifindex;
897  omode = MCAST_INCLUDE;
898  add = 1;
899  } else /* MCAST_LEAVE_SOURCE_GROUP */ {
900  omode = MCAST_INCLUDE;
901  add = 0;
902  }
903  err = ip_mc_source(add, omode, sk, &mreqs,
904  greqs.gsr_interface);
905  break;
906  }
907  case MCAST_MSFILTER:
908  {
909  struct sockaddr_in *psin;
910  struct ip_msfilter *msf = NULL;
911  struct group_filter *gsf = NULL;
912  int msize, i, ifindex;
913 
914  if (optlen < GROUP_FILTER_SIZE(0))
915  goto e_inval;
916  if (optlen > sysctl_optmem_max) {
917  err = -ENOBUFS;
918  break;
919  }
920  gsf = kmalloc(optlen, GFP_KERNEL);
921  if (!gsf) {
922  err = -ENOBUFS;
923  break;
924  }
925  err = -EFAULT;
926  if (copy_from_user(gsf, optval, optlen))
927  goto mc_msf_out;
928 
929  /* numsrc >= (4G-140)/128 overflow in 32 bits */
930  if (gsf->gf_numsrc >= 0x1ffffff ||
931  gsf->gf_numsrc > sysctl_igmp_max_msf) {
932  err = -ENOBUFS;
933  goto mc_msf_out;
934  }
935  if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
936  err = -EINVAL;
937  goto mc_msf_out;
938  }
939  msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
940  msf = kmalloc(msize, GFP_KERNEL);
941  if (!msf) {
942  err = -ENOBUFS;
943  goto mc_msf_out;
944  }
945  ifindex = gsf->gf_interface;
946  psin = (struct sockaddr_in *)&gsf->gf_group;
947  if (psin->sin_family != AF_INET) {
948  err = -EADDRNOTAVAIL;
949  goto mc_msf_out;
950  }
951  msf->imsf_multiaddr = psin->sin_addr.s_addr;
952  msf->imsf_interface = 0;
953  msf->imsf_fmode = gsf->gf_fmode;
954  msf->imsf_numsrc = gsf->gf_numsrc;
955  err = -EADDRNOTAVAIL;
956  for (i = 0; i < gsf->gf_numsrc; ++i) {
957  psin = (struct sockaddr_in *)&gsf->gf_slist[i];
958 
959  if (psin->sin_family != AF_INET)
960  goto mc_msf_out;
961  msf->imsf_slist[i] = psin->sin_addr.s_addr;
962  }
963  kfree(gsf);
964  gsf = NULL;
965 
966  err = ip_mc_msfilter(sk, msf, ifindex);
967 mc_msf_out:
968  kfree(msf);
969  kfree(gsf);
970  break;
971  }
972  case IP_MULTICAST_ALL:
973  if (optlen < 1)
974  goto e_inval;
975  if (val != 0 && val != 1)
976  goto e_inval;
977  inet->mc_all = val;
978  break;
979  case IP_ROUTER_ALERT:
980  err = ip_ra_control(sk, val ? 1 : 0, NULL);
981  break;
982 
983  case IP_FREEBIND:
984  if (optlen < 1)
985  goto e_inval;
986  inet->freebind = !!val;
987  break;
988 
989  case IP_IPSEC_POLICY:
990  case IP_XFRM_POLICY:
991  err = -EPERM;
992  if (!capable(CAP_NET_ADMIN))
993  break;
994  err = xfrm_user_policy(sk, optname, optval, optlen);
995  break;
996 
997  case IP_TRANSPARENT:
998  if (!!val && !capable(CAP_NET_RAW) && !capable(CAP_NET_ADMIN)) {
999  err = -EPERM;
1000  break;
1001  }
1002  if (optlen < 1)
1003  goto e_inval;
1004  inet->transparent = !!val;
1005  break;
1006 
1007  case IP_MINTTL:
1008  if (optlen < 1)
1009  goto e_inval;
1010  if (val < 0 || val > 255)
1011  goto e_inval;
1012  inet->min_ttl = val;
1013  break;
1014 
1015  default:
1016  err = -ENOPROTOOPT;
1017  break;
1018  }
1019  release_sock(sk);
1020  return err;
1021 
1022 e_inval:
1023  release_sock(sk);
1024  return -EINVAL;
1025 }
1026 
1036 void ipv4_pktinfo_prepare(struct sk_buff *skb)
1037 {
1038  struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb);
1039 
1040  if (skb_rtable(skb)) {
1041  pktinfo->ipi_ifindex = inet_iif(skb);
1042  pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb);
1043  } else {
1044  pktinfo->ipi_ifindex = 0;
1045  pktinfo->ipi_spec_dst.s_addr = 0;
1046  }
1047  skb_dst_drop(skb);
1048 }
1049 
1050 int ip_setsockopt(struct sock *sk, int level,
1051  int optname, char __user *optval, unsigned int optlen)
1052 {
1053  int err;
1054 
1055  if (level != SOL_IP)
1056  return -ENOPROTOOPT;
1057 
1058  err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1059 #ifdef CONFIG_NETFILTER
1060  /* we need to exclude all possible ENOPROTOOPTs except default case */
1061  if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
1062  optname != IP_IPSEC_POLICY &&
1063  optname != IP_XFRM_POLICY &&
1064  !ip_mroute_opt(optname)) {
1065  lock_sock(sk);
1066  err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
1067  release_sock(sk);
1068  }
1069 #endif
1070  return err;
1071 }
1072 EXPORT_SYMBOL(ip_setsockopt);
1073 
1074 #ifdef CONFIG_COMPAT
1075 int compat_ip_setsockopt(struct sock *sk, int level, int optname,
1076  char __user *optval, unsigned int optlen)
1077 {
1078  int err;
1079 
1080  if (level != SOL_IP)
1081  return -ENOPROTOOPT;
1082 
1083  if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
1084  return compat_mc_setsockopt(sk, level, optname, optval, optlen,
1085  ip_setsockopt);
1086 
1087  err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1088 #ifdef CONFIG_NETFILTER
1089  /* we need to exclude all possible ENOPROTOOPTs except default case */
1090  if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
1091  optname != IP_IPSEC_POLICY &&
1092  optname != IP_XFRM_POLICY &&
1093  !ip_mroute_opt(optname)) {
1094  lock_sock(sk);
1095  err = compat_nf_setsockopt(sk, PF_INET, optname,
1096  optval, optlen);
1097  release_sock(sk);
1098  }
1099 #endif
1100  return err;
1101 }
1102 EXPORT_SYMBOL(compat_ip_setsockopt);
1103 #endif
1104 
1105 /*
1106  * Get the options. Note for future reference. The GET of IP options gets
1107  * the _received_ ones. The set sets the _sent_ ones.
1108  */
1109 
1110 static int do_ip_getsockopt(struct sock *sk, int level, int optname,
1111  char __user *optval, int __user *optlen, unsigned int flags)
1112 {
1113  struct inet_sock *inet = inet_sk(sk);
1114  int val;
1115  int len;
1116 
1117  if (level != SOL_IP)
1118  return -EOPNOTSUPP;
1119 
1120  if (ip_mroute_opt(optname))
1121  return ip_mroute_getsockopt(sk, optname, optval, optlen);
1122 
1123  if (get_user(len, optlen))
1124  return -EFAULT;
1125  if (len < 0)
1126  return -EINVAL;
1127 
1128  lock_sock(sk);
1129 
1130  switch (optname) {
1131  case IP_OPTIONS:
1132  {
1133  unsigned char optbuf[sizeof(struct ip_options)+40];
1134  struct ip_options *opt = (struct ip_options *)optbuf;
1135  struct ip_options_rcu *inet_opt;
1136 
1137  inet_opt = rcu_dereference_protected(inet->inet_opt,
1138  sock_owned_by_user(sk));
1139  opt->optlen = 0;
1140  if (inet_opt)
1141  memcpy(optbuf, &inet_opt->opt,
1142  sizeof(struct ip_options) +
1143  inet_opt->opt.optlen);
1144  release_sock(sk);
1145 
1146  if (opt->optlen == 0)
1147  return put_user(0, optlen);
1148 
1149  ip_options_undo(opt);
1150 
1151  len = min_t(unsigned int, len, opt->optlen);
1152  if (put_user(len, optlen))
1153  return -EFAULT;
1154  if (copy_to_user(optval, opt->__data, len))
1155  return -EFAULT;
1156  return 0;
1157  }
1158  case IP_PKTINFO:
1159  val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
1160  break;
1161  case IP_RECVTTL:
1162  val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
1163  break;
1164  case IP_RECVTOS:
1165  val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
1166  break;
1167  case IP_RECVOPTS:
1168  val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
1169  break;
1170  case IP_RETOPTS:
1171  val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
1172  break;
1173  case IP_PASSSEC:
1174  val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
1175  break;
1176  case IP_RECVORIGDSTADDR:
1177  val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0;
1178  break;
1179  case IP_TOS:
1180  val = inet->tos;
1181  break;
1182  case IP_TTL:
1183  val = (inet->uc_ttl == -1 ?
1184  sysctl_ip_default_ttl :
1185  inet->uc_ttl);
1186  break;
1187  case IP_HDRINCL:
1188  val = inet->hdrincl;
1189  break;
1190  case IP_NODEFRAG:
1191  val = inet->nodefrag;
1192  break;
1193  case IP_MTU_DISCOVER:
1194  val = inet->pmtudisc;
1195  break;
1196  case IP_MTU:
1197  {
1198  struct dst_entry *dst;
1199  val = 0;
1200  dst = sk_dst_get(sk);
1201  if (dst) {
1202  val = dst_mtu(dst);
1203  dst_release(dst);
1204  }
1205  if (!val) {
1206  release_sock(sk);
1207  return -ENOTCONN;
1208  }
1209  break;
1210  }
1211  case IP_RECVERR:
1212  val = inet->recverr;
1213  break;
1214  case IP_MULTICAST_TTL:
1215  val = inet->mc_ttl;
1216  break;
1217  case IP_MULTICAST_LOOP:
1218  val = inet->mc_loop;
1219  break;
1220  case IP_UNICAST_IF:
1221  val = (__force int)htonl((__u32) inet->uc_index);
1222  break;
1223  case IP_MULTICAST_IF:
1224  {
1225  struct in_addr addr;
1226  len = min_t(unsigned int, len, sizeof(struct in_addr));
1227  addr.s_addr = inet->mc_addr;
1228  release_sock(sk);
1229 
1230  if (put_user(len, optlen))
1231  return -EFAULT;
1232  if (copy_to_user(optval, &addr, len))
1233  return -EFAULT;
1234  return 0;
1235  }
1236  case IP_MSFILTER:
1237  {
1238  struct ip_msfilter msf;
1239  int err;
1240 
1241  if (len < IP_MSFILTER_SIZE(0)) {
1242  release_sock(sk);
1243  return -EINVAL;
1244  }
1245  if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
1246  release_sock(sk);
1247  return -EFAULT;
1248  }
1249  err = ip_mc_msfget(sk, &msf,
1250  (struct ip_msfilter __user *)optval, optlen);
1251  release_sock(sk);
1252  return err;
1253  }
1254  case MCAST_MSFILTER:
1255  {
1256  struct group_filter gsf;
1257  int err;
1258 
1259  if (len < GROUP_FILTER_SIZE(0)) {
1260  release_sock(sk);
1261  return -EINVAL;
1262  }
1263  if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
1264  release_sock(sk);
1265  return -EFAULT;
1266  }
1267  err = ip_mc_gsfget(sk, &gsf,
1268  (struct group_filter __user *)optval,
1269  optlen);
1270  release_sock(sk);
1271  return err;
1272  }
1273  case IP_MULTICAST_ALL:
1274  val = inet->mc_all;
1275  break;
1276  case IP_PKTOPTIONS:
1277  {
1278  struct msghdr msg;
1279 
1280  release_sock(sk);
1281 
1282  if (sk->sk_type != SOCK_STREAM)
1283  return -ENOPROTOOPT;
1284 
1285  msg.msg_control = optval;
1286  msg.msg_controllen = len;
1287  msg.msg_flags = flags;
1288 
1289  if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
1290  struct in_pktinfo info;
1291 
1292  info.ipi_addr.s_addr = inet->inet_rcv_saddr;
1293  info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr;
1294  info.ipi_ifindex = inet->mc_index;
1295  put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
1296  }
1297  if (inet->cmsg_flags & IP_CMSG_TTL) {
1298  int hlim = inet->mc_ttl;
1299  put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
1300  }
1301  if (inet->cmsg_flags & IP_CMSG_TOS) {
1302  int tos = inet->rcv_tos;
1303  put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos);
1304  }
1305  len -= msg.msg_controllen;
1306  return put_user(len, optlen);
1307  }
1308  case IP_FREEBIND:
1309  val = inet->freebind;
1310  break;
1311  case IP_TRANSPARENT:
1312  val = inet->transparent;
1313  break;
1314  case IP_MINTTL:
1315  val = inet->min_ttl;
1316  break;
1317  default:
1318  release_sock(sk);
1319  return -ENOPROTOOPT;
1320  }
1321  release_sock(sk);
1322 
1323  if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) {
1324  unsigned char ucval = (unsigned char)val;
1325  len = 1;
1326  if (put_user(len, optlen))
1327  return -EFAULT;
1328  if (copy_to_user(optval, &ucval, 1))
1329  return -EFAULT;
1330  } else {
1331  len = min_t(unsigned int, sizeof(int), len);
1332  if (put_user(len, optlen))
1333  return -EFAULT;
1334  if (copy_to_user(optval, &val, len))
1335  return -EFAULT;
1336  }
1337  return 0;
1338 }
1339 
1340 int ip_getsockopt(struct sock *sk, int level,
1341  int optname, char __user *optval, int __user *optlen)
1342 {
1343  int err;
1344 
1345  err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0);
1346 #ifdef CONFIG_NETFILTER
1347  /* we need to exclude all possible ENOPROTOOPTs except default case */
1348  if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1349  !ip_mroute_opt(optname)) {
1350  int len;
1351 
1352  if (get_user(len, optlen))
1353  return -EFAULT;
1354 
1355  lock_sock(sk);
1356  err = nf_getsockopt(sk, PF_INET, optname, optval,
1357  &len);
1358  release_sock(sk);
1359  if (err >= 0)
1360  err = put_user(len, optlen);
1361  return err;
1362  }
1363 #endif
1364  return err;
1365 }
1366 EXPORT_SYMBOL(ip_getsockopt);
1367 
1368 #ifdef CONFIG_COMPAT
1369 int compat_ip_getsockopt(struct sock *sk, int level, int optname,
1370  char __user *optval, int __user *optlen)
1371 {
1372  int err;
1373 
1374  if (optname == MCAST_MSFILTER)
1375  return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1376  ip_getsockopt);
1377 
1378  err = do_ip_getsockopt(sk, level, optname, optval, optlen,
1379  MSG_CMSG_COMPAT);
1380 
1381 #ifdef CONFIG_NETFILTER
1382  /* we need to exclude all possible ENOPROTOOPTs except default case */
1383  if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1384  !ip_mroute_opt(optname)) {
1385  int len;
1386 
1387  if (get_user(len, optlen))
1388  return -EFAULT;
1389 
1390  lock_sock(sk);
1391  err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
1392  release_sock(sk);
1393  if (err >= 0)
1394  err = put_user(len, optlen);
1395  return err;
1396  }
1397 #endif
1398  return err;
1399 }
1400 EXPORT_SYMBOL(compat_ip_getsockopt);
1401 #endif
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