net/ipv4/ip_sockglue.c

   1 /*
   2  * INET         An implementation of the TCP/IP protocol suite for the LINUX
   3  *              operating system.  INET is implemented using the  BSD Socket
   4  *              interface as the means of communication with the user level.
   5  *
   6  *              The IP to API glue.
   7  *
   8  * Version:     $Id: ip_sockglue.c,v 1.62 2002/02/01 22:01:04 davem Exp $
   9  *
  10  * Authors:     see ip.c
  11  *
  12  * Fixes:
  13  *              Many            :       Split from ip.c , see ip.c for history.
  14  *              Martin Mares    :       TOS setting fixed.
  15  *              Alan Cox        :       Fixed a couple of oopses in Martin's
  16  *                                      TOS tweaks.
  17  *              Mike McLagan    :       Routing by source
  18  */
  19
  20 #include <linux/module.h>
  21 #include <linux/types.h>
  22 #include <linux/mm.h>
  23 #include <linux/skbuff.h>
  24 #include <linux/ip.h>
  25 #include <linux/icmp.h>
  26 #include <linux/inetdevice.h>
  27 #include <linux/netdevice.h>
  28 #include <net/sock.h>
  29 #include <net/ip.h>
  30 #include <net/icmp.h>
  31 #include <net/tcp_states.h>
  32 #include <linux/udp.h>
  33 #include <linux/igmp.h>
  34 #include <linux/netfilter.h>
  35 #include <linux/route.h>
  36 #include <linux/mroute.h>
  37 #include <net/route.h>
  38 #include <net/xfrm.h>
  39 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
  40 #include <net/transp_v6.h>
  41 #endif
  42
  43 #include <linux/errqueue.h>
  44 #include <asm/uaccess.h>
  45
  46 #define IP_CMSG_PKTINFO         1
  47 #define IP_CMSG_TTL             2
  48 #define IP_CMSG_TOS             4
  49 #define IP_CMSG_RECVOPTS        8
  50 #define IP_CMSG_RETOPTS         16
  51 #define IP_CMSG_PASSSEC         32
  52
  53 /*
  54  *      SOL_IP control messages.
  55  */
  56
  57 static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb)
  58 {
  59         struct in_pktinfo info;
  60         struct rtable *rt = (struct rtable *)skb->dst;
  61
  62         info.ipi_addr.s_addr = ip_hdr(skb)->daddr;
  63         if (rt) {
  64                 info.ipi_ifindex = rt->rt_iif;
  65                 info.ipi_spec_dst.s_addr = rt->rt_spec_dst;
  66         } else {
  67                 info.ipi_ifindex = 0;
  68                 info.ipi_spec_dst.s_addr = 0;
  69         }
  70
  71         put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
  72 }
  73
  74 static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb)
  75 {
  76         int ttl = ip_hdr(skb)->ttl;
  77         put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl);
  78 }
  79
  80 static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb)
  81 {
  82         put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos);
  83 }
  84
  85 static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb)
  86 {
  87         if (IPCB(skb)->opt.optlen == 0)
  88                 return;
  89
  90         put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen,
  91                  ip_hdr(skb) + 1);
  92 }
  93
  94
  95 static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb)
  96 {
  97         unsigned char optbuf[sizeof(struct ip_options) + 40];
  98         struct ip_options * opt = (struct ip_options*)optbuf;
  99
 100         if (IPCB(skb)->opt.optlen == 0)
 101                 return;
 102
 103         if (ip_options_echo(opt, skb)) {
 104                 msg->msg_flags |= MSG_CTRUNC;
 105                 return;
 106         }
 107         ip_options_undo(opt);
 108
 109         put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data);
 110 }
 111
 112 static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
 113 {
 114         char *secdata;
 115         u32 seclen, secid;
 116         int err;
 117
 118         err = security_socket_getpeersec_dgram(NULL, skb, &secid);
 119         if (err)
 120                 return;
 121
 122         err = security_secid_to_secctx(secid, &secdata, &seclen);
 123         if (err)
 124                 return;
 125
 126         put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata);
 127         security_release_secctx(secdata, seclen);
 128 }
 129
 130
 131 void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
 132 {
 133         struct inet_sock *inet = inet_sk(skb->sk);
 134         unsigned flags = inet->cmsg_flags;
 135
 136         /* Ordered by supposed usage frequency */
 137         if (flags & 1)
 138                 ip_cmsg_recv_pktinfo(msg, skb);
 139         if ((flags>>=1) == 0)
 140                 return;
 141
 142         if (flags & 1)
 143                 ip_cmsg_recv_ttl(msg, skb);
 144         if ((flags>>=1) == 0)
 145                 return;
 146
 147         if (flags & 1)
 148                 ip_cmsg_recv_tos(msg, skb);
 149         if ((flags>>=1) == 0)
 150                 return;
 151
 152         if (flags & 1)
 153                 ip_cmsg_recv_opts(msg, skb);
 154         if ((flags>>=1) == 0)
 155                 return;
 156
 157         if (flags & 1)
 158                 ip_cmsg_recv_retopts(msg, skb);
 159         if ((flags>>=1) == 0)
 160                 return;
 161
 162         if (flags & 1)
 163                 ip_cmsg_recv_security(msg, skb);
 164 }
 165
 166 int ip_cmsg_send(struct msghdr *msg, struct ipcm_cookie *ipc)
 167 {
 168         int err;
 169         struct cmsghdr *cmsg;
 170
 171         for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
 172                 if (!CMSG_OK(msg, cmsg))
 173                         return -EINVAL;
 174                 if (cmsg->cmsg_level != SOL_IP)
 175                         continue;
 176                 switch (cmsg->cmsg_type) {
 177                 case IP_RETOPTS:
 178                         err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
 179                         err = ip_options_get(&ipc->opt, CMSG_DATA(cmsg), err < 40 ? err : 40);
 180                         if (err)
 181                                 return err;
 182                         break;
 183                 case IP_PKTINFO:
 184                 {
 185                         struct in_pktinfo *info;
 186                         if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
 187                                 return -EINVAL;
 188                         info = (struct in_pktinfo *)CMSG_DATA(cmsg);
 189                         ipc->oif = info->ipi_ifindex;
 190                         ipc->addr = info->ipi_spec_dst.s_addr;
 191                         break;
 192                 }
 193                 default:
 194                         return -EINVAL;
 195                 }
 196         }
 197         return 0;
 198 }
 199
 200
 201 /* Special input handler for packets caught by router alert option.
 202    They are selected only by protocol field, and then processed likely
 203    local ones; but only if someone wants them! Otherwise, router
 204    not running rsvpd will kill RSVP.
 205
 206    It is user level problem, what it will make with them.
 207    I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
 208    but receiver should be enough clever f.e. to forward mtrace requests,
 209    sent to multicast group to reach destination designated router.
 210  */
 211 struct ip_ra_chain *ip_ra_chain;
 212 DEFINE_RWLOCK(ip_ra_lock);
 213
 214 int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *))
 215 {
 216         struct ip_ra_chain *ra, *new_ra, **rap;
 217
 218         if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num == IPPROTO_RAW)
 219                 return -EINVAL;
 220
 221         new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
 222
 223         write_lock_bh(&ip_ra_lock);
 224         for (rap = &ip_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
 225                 if (ra->sk == sk) {
 226                         if (on) {
 227                                 write_unlock_bh(&ip_ra_lock);
 228                                 kfree(new_ra);
 229                                 return -EADDRINUSE;
 230                         }
 231                         *rap = ra->next;
 232                         write_unlock_bh(&ip_ra_lock);
 233
 234                         if (ra->destructor)
 235                                 ra->destructor(sk);
 236                         sock_put(sk);
 237                         kfree(ra);
 238                         return 0;
 239                 }
 240         }
 241         if (new_ra == NULL) {
 242                 write_unlock_bh(&ip_ra_lock);
 243                 return -ENOBUFS;
 244         }
 245         new_ra->sk = sk;
 246         new_ra->destructor = destructor;
 247
 248         new_ra->next = ra;
 249         *rap = new_ra;
 250         sock_hold(sk);
 251         write_unlock_bh(&ip_ra_lock);
 252
 253         return 0;
 254 }
 255
 256 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
 257                    __be16 port, u32 info, u8 *payload)
 258 {
 259         struct inet_sock *inet = inet_sk(sk);
 260         struct sock_exterr_skb *serr;
 261
 262         if (!inet->recverr)
 263                 return;
 264
 265         skb = skb_clone(skb, GFP_ATOMIC);
 266         if (!skb)
 267                 return;
 268
 269         serr = SKB_EXT_ERR(skb);
 270         serr->ee.ee_errno = err;
 271         serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
 272         serr->ee.ee_type = icmp_hdr(skb)->type;
 273         serr->ee.ee_code = icmp_hdr(skb)->code;
 274         serr->ee.ee_pad = 0;
 275         serr->ee.ee_info = info;
 276         serr->ee.ee_data = 0;
 277         serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) -
 278                                    skb_network_header(skb);
 279         serr->port = port;
 280
 281         if (skb_pull(skb, payload - skb->data) != NULL) {
 282                 skb_reset_transport_header(skb);
 283                 if (sock_queue_err_skb(sk, skb) == 0)
 284                         return;
 285         }
 286         kfree_skb(skb);
 287 }
 288
 289 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info)
 290 {
 291         struct inet_sock *inet = inet_sk(sk);
 292         struct sock_exterr_skb *serr;
 293         struct iphdr *iph;
 294         struct sk_buff *skb;
 295
 296         if (!inet->recverr)
 297                 return;
 298
 299         skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
 300         if (!skb)
 301                 return;
 302
 303         skb_put(skb, sizeof(struct iphdr));
 304         skb_reset_network_header(skb);
 305         iph = ip_hdr(skb);
 306         iph->daddr = daddr;
 307
 308         serr = SKB_EXT_ERR(skb);
 309         serr->ee.ee_errno = err;
 310         serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
 311         serr->ee.ee_type = 0;
 312         serr->ee.ee_code = 0;
 313         serr->ee.ee_pad = 0;
 314         serr->ee.ee_info = info;
 315         serr->ee.ee_data = 0;
 316         serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
 317         serr->port = port;
 318
 319         __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
 320         skb_reset_transport_header(skb);
 321
 322         if (sock_queue_err_skb(sk, skb))
 323                 kfree_skb(skb);
 324 }
 325
 326 /*
 327  *      Handle MSG_ERRQUEUE
 328  */
 329 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len)
 330 {
 331         struct sock_exterr_skb *serr;
 332         struct sk_buff *skb, *skb2;
 333         struct sockaddr_in *sin;
 334         struct {
 335                 struct sock_extended_err ee;
 336                 struct sockaddr_in       offender;
 337         } errhdr;
 338         int err;
 339         int copied;
 340
 341         err = -EAGAIN;
 342         skb = skb_dequeue(&sk->sk_error_queue);
 343         if (skb == NULL)
 344                 goto out;
 345
 346         copied = skb->len;
 347         if (copied > len) {
 348                 msg->msg_flags |= MSG_TRUNC;
 349                 copied = len;
 350         }
 351         err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
 352         if (err)
 353                 goto out_free_skb;
 354
 355         sock_recv_timestamp(msg, sk, skb);
 356
 357         serr = SKB_EXT_ERR(skb);
 358
 359         sin = (struct sockaddr_in *)msg->msg_name;
 360         if (sin) {
 361                 sin->sin_family = AF_INET;
 362                 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) +
 363                                                    serr->addr_offset);
 364                 sin->sin_port = serr->port;
 365                 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
 366         }
 367
 368         memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
 369         sin = &errhdr.offender;
 370         sin->sin_family = AF_UNSPEC;
 371         if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) {
 372                 struct inet_sock *inet = inet_sk(sk);
 373
 374                 sin->sin_family = AF_INET;
 375                 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
 376                 sin->sin_port = 0;
 377                 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
 378                 if (inet->cmsg_flags)
 379                         ip_cmsg_recv(msg, skb);
 380         }
 381
 382         put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
 383
 384         /* Now we could try to dump offended packet options */
 385
 386         msg->msg_flags |= MSG_ERRQUEUE;
 387         err = copied;
 388
 389         /* Reset and regenerate socket error */
 390         spin_lock_bh(&sk->sk_error_queue.lock);
 391         sk->sk_err = 0;
 392         if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
 393                 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
 394                 spin_unlock_bh(&sk->sk_error_queue.lock);
 395                 sk->sk_error_report(sk);
 396         } else
 397                 spin_unlock_bh(&sk->sk_error_queue.lock);
 398
 399 out_free_skb:
 400         kfree_skb(skb);
 401 out:
 402         return err;
 403 }
 404
 405
 406 /*
 407  *      Socket option code for IP. This is the end of the line after any TCP,UDP etc options on
 408  *      an IP socket.
 409  */
 410
 411 static int do_ip_setsockopt(struct sock *sk, int level,
 412                             int optname, char __user *optval, int optlen)
 413 {
 414         struct inet_sock *inet = inet_sk(sk);
 415         int val=0,err;
 416
 417         if (((1<<optname) & ((1<<IP_PKTINFO) | (1<<IP_RECVTTL) |
 418                              (1<<IP_RECVOPTS) | (1<<IP_RECVTOS) |
 419                              (1<<IP_RETOPTS) | (1<<IP_TOS) |
 420                              (1<<IP_TTL) | (1<<IP_HDRINCL) |
 421                              (1<<IP_MTU_DISCOVER) | (1<<IP_RECVERR) |
 422                              (1<<IP_ROUTER_ALERT) | (1<<IP_FREEBIND) |
 423                              (1<<IP_PASSSEC))) ||
 424             optname == IP_MULTICAST_TTL ||
 425             optname == IP_MULTICAST_LOOP) {
 426                 if (optlen >= sizeof(int)) {
 427                         if (get_user(val, (int __user *) optval))
 428                                 return -EFAULT;
 429                 } else if (optlen >= sizeof(char)) {
 430                         unsigned char ucval;
 431
 432                         if (get_user(ucval, (unsigned char __user *) optval))
 433                                 return -EFAULT;
 434                         val = (int) ucval;
 435                 }
 436         }
 437
 438         /* If optlen==0, it is equivalent to val == 0 */
 439
 440         if (ip_mroute_opt(optname))
 441                 return ip_mroute_setsockopt(sk,optname,optval,optlen);
 442
 443         err = 0;
 444         lock_sock(sk);
 445
 446         switch (optname) {
 447         case IP_OPTIONS:
 448         {
 449                 struct ip_options * opt = NULL;
 450                 if (optlen > 40 || optlen < 0)
 451                         goto e_inval;
 452                 err = ip_options_get_from_user(&opt, optval, optlen);
 453                 if (err)
 454                         break;
 455                 if (inet->is_icsk) {
 456                         struct inet_connection_sock *icsk = inet_csk(sk);
 457 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 458                         if (sk->sk_family == PF_INET ||
 459                             (!((1 << sk->sk_state) &
 460                                (TCPF_LISTEN | TCPF_CLOSE)) &&
 461                              inet->daddr != LOOPBACK4_IPV6)) {
 462 #endif
 463                                 if (inet->opt)
 464                                         icsk->icsk_ext_hdr_len -= inet->opt->optlen;
 465                                 if (opt)
 466                                         icsk->icsk_ext_hdr_len += opt->optlen;
 467                                 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
 468 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 469                         }
 470 #endif
 471                 }
 472                 opt = xchg(&inet->opt, opt);
 473                 kfree(opt);
 474                 break;
 475         }
 476         case IP_PKTINFO:
 477                 if (val)
 478                         inet->cmsg_flags |= IP_CMSG_PKTINFO;
 479                 else
 480                         inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
 481                 break;
 482         case IP_RECVTTL:
 483                 if (val)
 484                         inet->cmsg_flags |=  IP_CMSG_TTL;
 485                 else
 486                         inet->cmsg_flags &= ~IP_CMSG_TTL;
 487                 break;
 488         case IP_RECVTOS:
 489                 if (val)
 490                         inet->cmsg_flags |=  IP_CMSG_TOS;
 491                 else
 492                         inet->cmsg_flags &= ~IP_CMSG_TOS;
 493                 break;
 494         case IP_RECVOPTS:
 495                 if (val)
 496                         inet->cmsg_flags |=  IP_CMSG_RECVOPTS;
 497                 else
 498                         inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
 499                 break;
 500         case IP_RETOPTS:
 501                 if (val)
 502                         inet->cmsg_flags |= IP_CMSG_RETOPTS;
 503                 else
 504                         inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
 505                 break;
 506         case IP_PASSSEC:
 507                 if (val)
 508                         inet->cmsg_flags |= IP_CMSG_PASSSEC;
 509                 else
 510                         inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
 511                 break;
 512         case IP_TOS:    /* This sets both TOS and Precedence */
 513                 if (sk->sk_type == SOCK_STREAM) {
 514                         val &= ~3;
 515                         val |= inet->tos & 3;
 516                 }
 517                 if (IPTOS_PREC(val) >= IPTOS_PREC_CRITIC_ECP &&
 518                     !capable(CAP_NET_ADMIN)) {
 519                         err = -EPERM;
 520                         break;
 521                 }
 522                 if (inet->tos != val) {
 523                         inet->tos = val;
 524                         sk->sk_priority = rt_tos2priority(val);
 525                         sk_dst_reset(sk);
 526                 }
 527                 break;
 528         case IP_TTL:
 529                 if (optlen<1)
 530                         goto e_inval;
 531                 if (val != -1 && (val < 1 || val>255))
 532                         goto e_inval;
 533                 inet->uc_ttl = val;
 534                 break;
 535         case IP_HDRINCL:
 536                 if (sk->sk_type != SOCK_RAW) {
 537                         err = -ENOPROTOOPT;
 538                         break;
 539                 }
 540                 inet->hdrincl = val ? 1 : 0;
 541                 break;
 542         case IP_MTU_DISCOVER:
 543                 if (val<0 || val>3)
 544                         goto e_inval;
 545                 inet->pmtudisc = val;
 546                 break;
 547         case IP_RECVERR:
 548                 inet->recverr = !!val;
 549                 if (!val)
 550                         skb_queue_purge(&sk->sk_error_queue);
 551                 break;
 552         case IP_MULTICAST_TTL:
 553                 if (sk->sk_type == SOCK_STREAM)
 554                         goto e_inval;
 555                 if (optlen<1)
 556                         goto e_inval;
 557                 if (val==-1)
 558                         val = 1;
 559                 if (val < 0 || val > 255)
 560                         goto e_inval;
 561                 inet->mc_ttl = val;
 562                 break;
 563         case IP_MULTICAST_LOOP:
 564                 if (optlen<1)
 565                         goto e_inval;
 566                 inet->mc_loop = !!val;
 567                 break;
 568         case IP_MULTICAST_IF:
 569         {
 570                 struct ip_mreqn mreq;
 571                 struct net_device *dev = NULL;
 572
 573                 if (sk->sk_type == SOCK_STREAM)
 574                         goto e_inval;
 575                 /*
 576                  *      Check the arguments are allowable
 577                  */
 578
 579                 err = -EFAULT;
 580                 if (optlen >= sizeof(struct ip_mreqn)) {
 581                         if (copy_from_user(&mreq,optval,sizeof(mreq)))
 582                                 break;
 583                 } else {
 584                         memset(&mreq, 0, sizeof(mreq));
 585                         if (optlen >= sizeof(struct in_addr) &&
 586                             copy_from_user(&mreq.imr_address,optval,sizeof(struct in_addr)))
 587                                 break;
 588                 }
 589
 590                 if (!mreq.imr_ifindex) {
 591                         if (mreq.imr_address.s_addr == INADDR_ANY) {
 592                                 inet->mc_index = 0;
 593                                 inet->mc_addr  = 0;
 594                                 err = 0;
 595                                 break;
 596                         }
 597                         dev = ip_dev_find(mreq.imr_address.s_addr);
 598                         if (dev) {
 599                                 mreq.imr_ifindex = dev->ifindex;
 600                                 dev_put(dev);
 601                         }
 602                 } else
 603                         dev = __dev_get_by_index(&init_net, mreq.imr_ifindex);
 604
 605
 606                 err = -EADDRNOTAVAIL;
 607                 if (!dev)
 608                         break;
 609
 610                 err = -EINVAL;
 611                 if (sk->sk_bound_dev_if &&
 612                     mreq.imr_ifindex != sk->sk_bound_dev_if)
 613                         break;
 614
 615                 inet->mc_index = mreq.imr_ifindex;
 616                 inet->mc_addr  = mreq.imr_address.s_addr;
 617                 err = 0;
 618                 break;
 619         }
 620
 621         case IP_ADD_MEMBERSHIP:
 622         case IP_DROP_MEMBERSHIP:
 623         {
 624                 struct ip_mreqn mreq;
 625
 626                 err = -EPROTO;
 627                 if (inet_sk(sk)->is_icsk)
 628                         break;
 629
 630                 if (optlen < sizeof(struct ip_mreq))
 631                         goto e_inval;
 632                 err = -EFAULT;
 633                 if (optlen >= sizeof(struct ip_mreqn)) {
 634                         if (copy_from_user(&mreq,optval,sizeof(mreq)))
 635                                 break;
 636                 } else {
 637                         memset(&mreq, 0, sizeof(mreq));
 638                         if (copy_from_user(&mreq,optval,sizeof(struct ip_mreq)))
 639                                 break;
 640                 }
 641
 642                 if (optname == IP_ADD_MEMBERSHIP)
 643                         err = ip_mc_join_group(sk, &mreq);
 644                 else
 645                         err = ip_mc_leave_group(sk, &mreq);
 646                 break;
 647         }
 648         case IP_MSFILTER:
 649         {
 650                 extern int sysctl_igmp_max_msf;
 651                 struct ip_msfilter *msf;
 652
 653                 if (optlen < IP_MSFILTER_SIZE(0))
 654                         goto e_inval;
 655                 if (optlen > sysctl_optmem_max) {
 656                         err = -ENOBUFS;
 657                         break;
 658                 }
 659                 msf = kmalloc(optlen, GFP_KERNEL);
 660                 if (!msf) {
 661                         err = -ENOBUFS;
 662                         break;
 663                 }
 664                 err = -EFAULT;
 665                 if (copy_from_user(msf, optval, optlen)) {
 666                         kfree(msf);
 667                         break;
 668                 }
 669                 /* numsrc >= (1G-4) overflow in 32 bits */
 670                 if (msf->imsf_numsrc >= 0x3ffffffcU ||
 671                     msf->imsf_numsrc > sysctl_igmp_max_msf) {
 672                         kfree(msf);
 673                         err = -ENOBUFS;
 674                         break;
 675                 }
 676                 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
 677                         kfree(msf);
 678                         err = -EINVAL;
 679                         break;
 680                 }
 681                 err = ip_mc_msfilter(sk, msf, 0);
 682                 kfree(msf);
 683                 break;
 684         }
 685         case IP_BLOCK_SOURCE:
 686         case IP_UNBLOCK_SOURCE:
 687         case IP_ADD_SOURCE_MEMBERSHIP:
 688         case IP_DROP_SOURCE_MEMBERSHIP:
 689         {
 690                 struct ip_mreq_source mreqs;
 691                 int omode, add;
 692
 693                 if (optlen != sizeof(struct ip_mreq_source))
 694                         goto e_inval;
 695                 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
 696                         err = -EFAULT;
 697                         break;
 698                 }
 699                 if (optname == IP_BLOCK_SOURCE) {
 700                         omode = MCAST_EXCLUDE;
 701                         add = 1;
 702                 } else if (optname == IP_UNBLOCK_SOURCE) {
 703                         omode = MCAST_EXCLUDE;
 704                         add = 0;
 705                 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
 706                         struct ip_mreqn mreq;
 707
 708                         mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
 709                         mreq.imr_address.s_addr = mreqs.imr_interface;
 710                         mreq.imr_ifindex = 0;
 711                         err = ip_mc_join_group(sk, &mreq);
 712                         if (err && err != -EADDRINUSE)
 713                                 break;
 714                         omode = MCAST_INCLUDE;
 715                         add = 1;
 716                 } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
 717                         omode = MCAST_INCLUDE;
 718                         add = 0;
 719                 }
 720                 err = ip_mc_source(add, omode, sk, &mreqs, 0);
 721                 break;
 722         }
 723         case MCAST_JOIN_GROUP:
 724         case MCAST_LEAVE_GROUP:
 725         {
 726                 struct group_req greq;
 727                 struct sockaddr_in *psin;
 728                 struct ip_mreqn mreq;
 729
 730                 if (optlen < sizeof(struct group_req))
 731                         goto e_inval;
 732                 err = -EFAULT;
 733                 if (copy_from_user(&greq, optval, sizeof(greq)))
 734                         break;
 735                 psin = (struct sockaddr_in *)&greq.gr_group;
 736                 if (psin->sin_family != AF_INET)
 737                         goto e_inval;
 738                 memset(&mreq, 0, sizeof(mreq));
 739                 mreq.imr_multiaddr = psin->sin_addr;
 740                 mreq.imr_ifindex = greq.gr_interface;
 741
 742                 if (optname == MCAST_JOIN_GROUP)
 743                         err = ip_mc_join_group(sk, &mreq);
 744                 else
 745                         err = ip_mc_leave_group(sk, &mreq);
 746                 break;
 747         }
 748         case MCAST_JOIN_SOURCE_GROUP:
 749         case MCAST_LEAVE_SOURCE_GROUP:
 750         case MCAST_BLOCK_SOURCE:
 751         case MCAST_UNBLOCK_SOURCE:
 752         {
 753                 struct group_source_req greqs;
 754                 struct ip_mreq_source mreqs;
 755                 struct sockaddr_in *psin;
 756                 int omode, add;
 757
 758                 if (optlen != sizeof(struct group_source_req))
 759                         goto e_inval;
 760                 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 761                         err = -EFAULT;
 762                         break;
 763                 }
 764                 if (greqs.gsr_group.ss_family != AF_INET ||
 765                     greqs.gsr_source.ss_family != AF_INET) {
 766                         err = -EADDRNOTAVAIL;
 767                         break;
 768                 }
 769                 psin = (struct sockaddr_in *)&greqs.gsr_group;
 770                 mreqs.imr_multiaddr = psin->sin_addr.s_addr;
 771                 psin = (struct sockaddr_in *)&greqs.gsr_source;
 772                 mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
 773                 mreqs.imr_interface = 0; /* use index for mc_source */
 774
 775                 if (optname == MCAST_BLOCK_SOURCE) {
 776                         omode = MCAST_EXCLUDE;
 777                         add = 1;
 778                 } else if (optname == MCAST_UNBLOCK_SOURCE) {
 779                         omode = MCAST_EXCLUDE;
 780                         add = 0;
 781                 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 782                         struct ip_mreqn mreq;
 783
 784                         psin = (struct sockaddr_in *)&greqs.gsr_group;
 785                         mreq.imr_multiaddr = psin->sin_addr;
 786                         mreq.imr_address.s_addr = 0;
 787                         mreq.imr_ifindex = greqs.gsr_interface;
 788                         err = ip_mc_join_group(sk, &mreq);
 789                         if (err && err != -EADDRINUSE)
 790                                 break;
 791                         greqs.gsr_interface = mreq.imr_ifindex;
 792                         omode = MCAST_INCLUDE;
 793                         add = 1;
 794                 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
 795                         omode = MCAST_INCLUDE;
 796                         add = 0;
 797                 }
 798                 err = ip_mc_source(add, omode, sk, &mreqs,
 799                                    greqs.gsr_interface);
 800                 break;
 801         }
 802         case MCAST_MSFILTER:
 803         {
 804                 extern int sysctl_igmp_max_msf;
 805                 struct sockaddr_in *psin;
 806                 struct ip_msfilter *msf = NULL;
 807                 struct group_filter *gsf = NULL;
 808                 int msize, i, ifindex;
 809
 810                 if (optlen < GROUP_FILTER_SIZE(0))
 811                         goto e_inval;
 812                 if (optlen > sysctl_optmem_max) {
 813                         err = -ENOBUFS;
 814                         break;
 815                 }
 816                 gsf = kmalloc(optlen,GFP_KERNEL);
 817                 if (!gsf) {
 818                         err = -ENOBUFS;
 819                         break;
 820                 }
 821                 err = -EFAULT;
 822                 if (copy_from_user(gsf, optval, optlen)) {
 823                         goto mc_msf_out;
 824                 }
 825                 /* numsrc >= (4G-140)/128 overflow in 32 bits */
 826                 if (gsf->gf_numsrc >= 0x1ffffff ||
 827                     gsf->gf_numsrc > sysctl_igmp_max_msf) {
 828                         err = -ENOBUFS;
 829                         goto mc_msf_out;
 830                 }
 831                 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 832                         err = -EINVAL;
 833                         goto mc_msf_out;
 834                 }
 835                 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
 836                 msf = kmalloc(msize,GFP_KERNEL);
 837                 if (!msf) {
 838                         err = -ENOBUFS;
 839                         goto mc_msf_out;
 840                 }
 841                 ifindex = gsf->gf_interface;
 842                 psin = (struct sockaddr_in *)&gsf->gf_group;
 843                 if (psin->sin_family != AF_INET) {
 844                         err = -EADDRNOTAVAIL;
 845                         goto mc_msf_out;
 846                 }
 847                 msf->imsf_multiaddr = psin->sin_addr.s_addr;
 848                 msf->imsf_interface = 0;
 849                 msf->imsf_fmode = gsf->gf_fmode;
 850                 msf->imsf_numsrc = gsf->gf_numsrc;
 851                 err = -EADDRNOTAVAIL;
 852                 for (i=0; i<gsf->gf_numsrc; ++i) {
 853                         psin = (struct sockaddr_in *)&gsf->gf_slist[i];
 854
 855                         if (psin->sin_family != AF_INET)
 856                                 goto mc_msf_out;
 857                         msf->imsf_slist[i] = psin->sin_addr.s_addr;
 858                 }
 859                 kfree(gsf);
 860                 gsf = NULL;
 861
 862                 err = ip_mc_msfilter(sk, msf, ifindex);
 863         mc_msf_out:
 864                 kfree(msf);
 865                 kfree(gsf);
 866                 break;
 867         }
 868         case IP_ROUTER_ALERT:
 869                 err = ip_ra_control(sk, val ? 1 : 0, NULL);
 870                 break;
 871
 872         case IP_FREEBIND:
 873                 if (optlen<1)
 874                         goto e_inval;
 875                 inet->freebind = !!val;
 876                 break;
 877
 878         case IP_IPSEC_POLICY:
 879         case IP_XFRM_POLICY:
 880                 err = -EPERM;
 881                 if (!capable(CAP_NET_ADMIN))
 882                         break;
 883                 err = xfrm_user_policy(sk, optname, optval, optlen);
 884                 break;
 885
 886         default:
 887                 err = -ENOPROTOOPT;
 888                 break;
 889         }
 890         release_sock(sk);
 891         return err;
 892
 893 e_inval:
 894         release_sock(sk);
 895         return -EINVAL;
 896 }
 897
 898 int ip_setsockopt(struct sock *sk, int level,
 899                 int optname, char __user *optval, int optlen)
 900 {
 901         int err;
 902
 903         if (level != SOL_IP)
 904                 return -ENOPROTOOPT;
 905
 906         err = do_ip_setsockopt(sk, level, optname, optval, optlen);
 907 #ifdef CONFIG_NETFILTER
 908         /* we need to exclude all possible ENOPROTOOPTs except default case */
 909         if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
 910                         optname != IP_IPSEC_POLICY &&
 911                         optname != IP_XFRM_POLICY &&
 912                         !ip_mroute_opt(optname)) {
 913                 lock_sock(sk);
 914                 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
 915                 release_sock(sk);
 916         }
 917 #endif
 918         return err;
 919 }
 920
 921 #ifdef CONFIG_COMPAT
 922 int compat_ip_setsockopt(struct sock *sk, int level, int optname,
 923                          char __user *optval, int optlen)
 924 {
 925         int err;
 926
 927         if (level != SOL_IP)
 928                 return -ENOPROTOOPT;
 929
 930         err = do_ip_setsockopt(sk, level, optname, optval, optlen);
 931 #ifdef CONFIG_NETFILTER
 932         /* we need to exclude all possible ENOPROTOOPTs except default case */
 933         if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
 934                         optname != IP_IPSEC_POLICY &&
 935                         optname != IP_XFRM_POLICY &&
 936                         !ip_mroute_opt(optname)) {
 937                 lock_sock(sk);
 938                 err = compat_nf_setsockopt(sk, PF_INET, optname,
 939                                            optval, optlen);
 940                 release_sock(sk);
 941         }
 942 #endif
 943         return err;
 944 }
 945
 946 EXPORT_SYMBOL(compat_ip_setsockopt);
 947 #endif
 948
 949 /*
 950  *      Get the options. Note for future reference. The GET of IP options gets the
 951  *      _received_ ones. The set sets the _sent_ ones.
 952  */
 953
 954 static int do_ip_getsockopt(struct sock *sk, int level, int optname,
 955                             char __user *optval, int __user *optlen)
 956 {
 957         struct inet_sock *inet = inet_sk(sk);
 958         int val;
 959         int len;
 960
 961         if (level != SOL_IP)
 962                 return -EOPNOTSUPP;
 963
 964         if (ip_mroute_opt(optname))
 965                 return ip_mroute_getsockopt(sk,optname,optval,optlen);
 966
 967         if (get_user(len,optlen))
 968                 return -EFAULT;
 969         if (len < 0)
 970                 return -EINVAL;
 971
 972         lock_sock(sk);
 973
 974         switch (optname) {
 975         case IP_OPTIONS:
 976         {
 977                 unsigned char optbuf[sizeof(struct ip_options)+40];
 978                 struct ip_options * opt = (struct ip_options*)optbuf;
 979                 opt->optlen = 0;
 980                 if (inet->opt)
 981                         memcpy(optbuf, inet->opt,
 982                                sizeof(struct ip_options)+
 983                                inet->opt->optlen);
 984                 release_sock(sk);
 985
 986                 if (opt->optlen == 0)
 987                         return put_user(0, optlen);
 988
 989                 ip_options_undo(opt);
 990
 991                 len = min_t(unsigned int, len, opt->optlen);
 992                 if (put_user(len, optlen))
 993                         return -EFAULT;
 994                 if (copy_to_user(optval, opt->__data, len))
 995                         return -EFAULT;
 996                 return 0;
 997         }
 998         case IP_PKTINFO:
 999                 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
1000                 break;
1001         case IP_RECVTTL:
1002                 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
1003                 break;
1004         case IP_RECVTOS:
1005                 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
1006                 break;
1007         case IP_RECVOPTS:
1008                 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
1009                 break;
1010         case IP_RETOPTS:
1011                 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
1012                 break;
1013         case IP_PASSSEC:
1014                 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
1015                 break;
1016         case IP_TOS:
1017                 val = inet->tos;
1018                 break;
1019         case IP_TTL:
1020                 val = (inet->uc_ttl == -1 ?
1021                        sysctl_ip_default_ttl :
1022                        inet->uc_ttl);
1023                 break;
1024         case IP_HDRINCL:
1025                 val = inet->hdrincl;
1026                 break;
1027         case IP_MTU_DISCOVER:
1028                 val = inet->pmtudisc;
1029                 break;
1030         case IP_MTU:
1031         {
1032                 struct dst_entry *dst;
1033                 val = 0;
1034                 dst = sk_dst_get(sk);
1035                 if (dst) {
1036                         val = dst_mtu(dst);
1037                         dst_release(dst);
1038                 }
1039                 if (!val) {
1040                         release_sock(sk);
1041                         return -ENOTCONN;
1042                 }
1043                 break;
1044         }
1045         case IP_RECVERR:
1046                 val = inet->recverr;
1047                 break;
1048         case IP_MULTICAST_TTL:
1049                 val = inet->mc_ttl;
1050                 break;
1051         case IP_MULTICAST_LOOP:
1052                 val = inet->mc_loop;
1053                 break;
1054         case IP_MULTICAST_IF:
1055         {
1056                 struct in_addr addr;
1057                 len = min_t(unsigned int, len, sizeof(struct in_addr));
1058                 addr.s_addr = inet->mc_addr;
1059                 release_sock(sk);
1060
1061                 if (put_user(len, optlen))
1062                         return -EFAULT;
1063                 if (copy_to_user(optval, &addr, len))
1064                         return -EFAULT;
1065                 return 0;
1066         }
1067         case IP_MSFILTER:
1068         {
1069                 struct ip_msfilter msf;
1070                 int err;
1071
1072                 if (len < IP_MSFILTER_SIZE(0)) {
1073                         release_sock(sk);
1074                         return -EINVAL;
1075                 }
1076                 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
1077                         release_sock(sk);
1078                         return -EFAULT;
1079                 }
1080                 err = ip_mc_msfget(sk, &msf,
1081                                    (struct ip_msfilter __user *)optval, optlen);
1082                 release_sock(sk);
1083                 return err;
1084         }
1085         case MCAST_MSFILTER:
1086         {
1087                 struct group_filter gsf;
1088                 int err;
1089
1090                 if (len < GROUP_FILTER_SIZE(0)) {
1091                         release_sock(sk);
1092                         return -EINVAL;
1093                 }
1094                 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
1095                         release_sock(sk);
1096                         return -EFAULT;
1097                 }
1098                 err = ip_mc_gsfget(sk, &gsf,
1099                                    (struct group_filter __user *)optval, optlen);
1100                 release_sock(sk);
1101                 return err;
1102         }
1103         case IP_PKTOPTIONS:
1104         {
1105                 struct msghdr msg;
1106
1107                 release_sock(sk);
1108
1109                 if (sk->sk_type != SOCK_STREAM)
1110                         return -ENOPROTOOPT;
1111
1112                 msg.msg_control = optval;
1113                 msg.msg_controllen = len;
1114                 msg.msg_flags = 0;
1115
1116                 if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
1117                         struct in_pktinfo info;
1118
1119                         info.ipi_addr.s_addr = inet->rcv_saddr;
1120                         info.ipi_spec_dst.s_addr = inet->rcv_saddr;
1121                         info.ipi_ifindex = inet->mc_index;
1122                         put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
1123                 }
1124                 if (inet->cmsg_flags & IP_CMSG_TTL) {
1125                         int hlim = inet->mc_ttl;
1126                         put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
1127                 }
1128                 len -= msg.msg_controllen;
1129                 return put_user(len, optlen);
1130         }
1131         case IP_FREEBIND:
1132                 val = inet->freebind;
1133                 break;
1134         default:
1135                 release_sock(sk);
1136                 return -ENOPROTOOPT;
1137         }
1138         release_sock(sk);
1139
1140         if (len < sizeof(int) && len > 0 && val>=0 && val<255) {
1141                 unsigned char ucval = (unsigned char)val;
1142                 len = 1;
1143                 if (put_user(len, optlen))
1144                         return -EFAULT;
1145                 if (copy_to_user(optval,&ucval,1))
1146                         return -EFAULT;
1147         } else {
1148                 len = min_t(unsigned int, sizeof(int), len);
1149                 if (put_user(len, optlen))
1150                         return -EFAULT;
1151                 if (copy_to_user(optval,&val,len))
1152                         return -EFAULT;
1153         }
1154         return 0;
1155 }
1156
1157 int ip_getsockopt(struct sock *sk, int level,
1158                   int optname, char __user *optval, int __user *optlen)
1159 {
1160         int err;
1161
1162         err = do_ip_getsockopt(sk, level, optname, optval, optlen);
1163 #ifdef CONFIG_NETFILTER
1164         /* we need to exclude all possible ENOPROTOOPTs except default case */
1165         if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1166                         !ip_mroute_opt(optname)) {
1167                 int len;
1168
1169                 if (get_user(len,optlen))
1170                         return -EFAULT;
1171
1172                 lock_sock(sk);
1173                 err = nf_getsockopt(sk, PF_INET, optname, optval,
1174                                 &len);
1175                 release_sock(sk);
1176                 if (err >= 0)
1177                         err = put_user(len, optlen);
1178                 return err;
1179         }
1180 #endif
1181         return err;
1182 }
1183
1184 #ifdef CONFIG_COMPAT
1185 int compat_ip_getsockopt(struct sock *sk, int level, int optname,
1186                          char __user *optval, int __user *optlen)
1187 {
1188         int err = do_ip_getsockopt(sk, level, optname, optval, optlen);
1189 #ifdef CONFIG_NETFILTER
1190         /* we need to exclude all possible ENOPROTOOPTs except default case */
1191         if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1192                         !ip_mroute_opt(optname)) {
1193                 int len;
1194
1195                 if (get_user(len, optlen))
1196                         return -EFAULT;
1197
1198                 lock_sock(sk);
1199                 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
1200                 release_sock(sk);
1201                 if (err >= 0)
1202                         err = put_user(len, optlen);
1203                 return err;
1204         }
1205 #endif
1206         return err;
1207 }
1208
1209 EXPORT_SYMBOL(compat_ip_getsockopt);
1210 #endif
1211
1212 EXPORT_SYMBOL(ip_cmsg_recv);
1213
1214 EXPORT_SYMBOL(ip_getsockopt);
1215 EXPORT_SYMBOL(ip_setsockopt);