git.oblomov.eu Git - linux-2.6/blob - 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/config.h>
  21 #include <linux/module.h>
  22 #include <linux/types.h>
  23 #include <linux/mm.h>
  24 #include <linux/sched.h>
  25 #include <linux/skbuff.h>
  26 #include <linux/ip.h>
  27 #include <linux/icmp.h>
  28 #include <linux/netdevice.h>
  29 #include <net/sock.h>
  30 #include <net/ip.h>
  31 #include <net/icmp.h>
  32 #include <net/tcp.h>
  33 #include <linux/tcp.h>
  34 #include <linux/udp.h>
  35 #include <linux/igmp.h>
  36 #include <linux/netfilter.h>
  37 #include <linux/route.h>
  38 #include <linux/mroute.h>
  39 #include <net/route.h>
  40 #include <net/xfrm.h>
  41 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
  42 #include <net/transp_v6.h>
  43 #endif
  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
  54 /*
  55  *      SOL_IP control messages.
  56  */
  57
  58 static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb)
  59 {
  60         struct in_pktinfo info;
  61         struct rtable *rt = (struct rtable *)skb->dst;
  62
  63         info.ipi_addr.s_addr = skb->nh.iph->daddr;
  64         if (rt) {
  65                 info.ipi_ifindex = rt->rt_iif;
  66                 info.ipi_spec_dst.s_addr = rt->rt_spec_dst;
  67         } else {
  68                 info.ipi_ifindex = 0;
  69                 info.ipi_spec_dst.s_addr = 0;
  70         }
  71
  72         put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
  73 }
  74
  75 static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb)
  76 {
  77         int ttl = skb->nh.iph->ttl;
  78         put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl);
  79 }
  80
  81 static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb)
  82 {
  83         put_cmsg(msg, SOL_IP, IP_TOS, 1, &skb->nh.iph->tos);
  84 }
  85
  86 static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb)
  87 {
  88         if (IPCB(skb)->opt.optlen == 0)
  89                 return;
  90
  91         put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen, skb->nh.iph+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
 113 void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
 114 {
 115         struct inet_sock *inet = inet_sk(skb->sk);
 116         unsigned flags = inet->cmsg_flags;
 117
 118         /* Ordered by supposed usage frequency */
 119         if (flags & 1)
 120                 ip_cmsg_recv_pktinfo(msg, skb);
 121         if ((flags>>=1) == 0)
 122                 return;
 123
 124         if (flags & 1)
 125                 ip_cmsg_recv_ttl(msg, skb);
 126         if ((flags>>=1) == 0)
 127                 return;
 128
 129         if (flags & 1)
 130                 ip_cmsg_recv_tos(msg, skb);
 131         if ((flags>>=1) == 0)
 132                 return;
 133
 134         if (flags & 1)
 135                 ip_cmsg_recv_opts(msg, skb);
 136         if ((flags>>=1) == 0)
 137                 return;
 138
 139         if (flags & 1)
 140                 ip_cmsg_recv_retopts(msg, skb);
 141 }
 142
 143 int ip_cmsg_send(struct msghdr *msg, struct ipcm_cookie *ipc)
 144 {
 145         int err;
 146         struct cmsghdr *cmsg;
 147
 148         for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
 149                 if (!CMSG_OK(msg, cmsg))
 150                         return -EINVAL;
 151                 if (cmsg->cmsg_level != SOL_IP)
 152                         continue;
 153                 switch (cmsg->cmsg_type) {
 154                 case IP_RETOPTS:
 155                         err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
 156                         err = ip_options_get(&ipc->opt, CMSG_DATA(cmsg), err < 40 ? err : 40, 0);
 157                         if (err)
 158                                 return err;
 159                         break;
 160                 case IP_PKTINFO:
 161                 {
 162                         struct in_pktinfo *info;
 163                         if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
 164                                 return -EINVAL;
 165                         info = (struct in_pktinfo *)CMSG_DATA(cmsg);
 166                         ipc->oif = info->ipi_ifindex;
 167                         ipc->addr = info->ipi_spec_dst.s_addr;
 168                         break;
 169                 }
 170                 default:
 171                         return -EINVAL;
 172                 }
 173         }
 174         return 0;
 175 }
 176
 177
 178 /* Special input handler for packets caught by router alert option.
 179    They are selected only by protocol field, and then processed likely
 180    local ones; but only if someone wants them! Otherwise, router
 181    not running rsvpd will kill RSVP.
 182
 183    It is user level problem, what it will make with them.
 184    I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
 185    but receiver should be enough clever f.e. to forward mtrace requests,
 186    sent to multicast group to reach destination designated router.
 187  */
 188 struct ip_ra_chain *ip_ra_chain;
 189 DEFINE_RWLOCK(ip_ra_lock);
 190
 191 int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *))
 192 {
 193         struct ip_ra_chain *ra, *new_ra, **rap;
 194
 195         if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num == IPPROTO_RAW)
 196                 return -EINVAL;
 197
 198         new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
 199
 200         write_lock_bh(&ip_ra_lock);
 201         for (rap = &ip_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
 202                 if (ra->sk == sk) {
 203                         if (on) {
 204                                 write_unlock_bh(&ip_ra_lock);
 205                                 if (new_ra)
 206                                         kfree(new_ra);
 207                                 return -EADDRINUSE;
 208                         }
 209                         *rap = ra->next;
 210                         write_unlock_bh(&ip_ra_lock);
 211
 212                         if (ra->destructor)
 213                                 ra->destructor(sk);
 214                         sock_put(sk);
 215                         kfree(ra);
 216                         return 0;
 217                 }
 218         }
 219         if (new_ra == NULL) {
 220                 write_unlock_bh(&ip_ra_lock);
 221                 return -ENOBUFS;
 222         }
 223         new_ra->sk = sk;
 224         new_ra->destructor = destructor;
 225
 226         new_ra->next = ra;
 227         *rap = new_ra;
 228         sock_hold(sk);
 229         write_unlock_bh(&ip_ra_lock);
 230
 231         return 0;
 232 }
 233
 234 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
 235                    u16 port, u32 info, u8 *payload)
 236 {
 237         struct inet_sock *inet = inet_sk(sk);
 238         struct sock_exterr_skb *serr;
 239
 240         if (!inet->recverr)
 241                 return;
 242
 243         skb = skb_clone(skb, GFP_ATOMIC);
 244         if (!skb)
 245                 return;
 246
 247         serr = SKB_EXT_ERR(skb);
 248         serr->ee.ee_errno = err;
 249         serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
 250         serr->ee.ee_type = skb->h.icmph->type;
 251         serr->ee.ee_code = skb->h.icmph->code;
 252         serr->ee.ee_pad = 0;
 253         serr->ee.ee_info = info;
 254         serr->ee.ee_data = 0;
 255         serr->addr_offset = (u8*)&(((struct iphdr*)(skb->h.icmph+1))->daddr) - skb->nh.raw;
 256         serr->port = port;
 257
 258         skb->h.raw = payload;
 259         if (!skb_pull(skb, payload - skb->data) ||
 260             sock_queue_err_skb(sk, skb))
 261                 kfree_skb(skb);
 262 }
 263
 264 void ip_local_error(struct sock *sk, int err, u32 daddr, u16 port, u32 info)
 265 {
 266         struct inet_sock *inet = inet_sk(sk);
 267         struct sock_exterr_skb *serr;
 268         struct iphdr *iph;
 269         struct sk_buff *skb;
 270
 271         if (!inet->recverr)
 272                 return;
 273
 274         skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
 275         if (!skb)
 276                 return;
 277
 278         iph = (struct iphdr*)skb_put(skb, sizeof(struct iphdr));
 279         skb->nh.iph = iph;
 280         iph->daddr = daddr;
 281
 282         serr = SKB_EXT_ERR(skb);
 283         serr->ee.ee_errno = err;
 284         serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
 285         serr->ee.ee_type = 0;
 286         serr->ee.ee_code = 0;
 287         serr->ee.ee_pad = 0;
 288         serr->ee.ee_info = info;
 289         serr->ee.ee_data = 0;
 290         serr->addr_offset = (u8*)&iph->daddr - skb->nh.raw;
 291         serr->port = port;
 292
 293         skb->h.raw = skb->tail;
 294         __skb_pull(skb, skb->tail - skb->data);
 295
 296         if (sock_queue_err_skb(sk, skb))
 297                 kfree_skb(skb);
 298 }
 299
 300 /*
 301  *      Handle MSG_ERRQUEUE
 302  */
 303 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len)
 304 {
 305         struct sock_exterr_skb *serr;
 306         struct sk_buff *skb, *skb2;
 307         struct sockaddr_in *sin;
 308         struct {
 309                 struct sock_extended_err ee;
 310                 struct sockaddr_in       offender;
 311         } errhdr;
 312         int err;
 313         int copied;
 314
 315         err = -EAGAIN;
 316         skb = skb_dequeue(&sk->sk_error_queue);
 317         if (skb == NULL)
 318                 goto out;
 319
 320         copied = skb->len;
 321         if (copied > len) {
 322                 msg->msg_flags |= MSG_TRUNC;
 323                 copied = len;
 324         }
 325         err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
 326         if (err)
 327                 goto out_free_skb;
 328
 329         sock_recv_timestamp(msg, sk, skb);
 330
 331         serr = SKB_EXT_ERR(skb);
 332
 333         sin = (struct sockaddr_in *)msg->msg_name;
 334         if (sin) {
 335                 sin->sin_family = AF_INET;
 336                 sin->sin_addr.s_addr = *(u32*)(skb->nh.raw + serr->addr_offset);
 337                 sin->sin_port = serr->port;
 338                 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
 339         }
 340
 341         memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
 342         sin = &errhdr.offender;
 343         sin->sin_family = AF_UNSPEC;
 344         if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) {
 345                 struct inet_sock *inet = inet_sk(sk);
 346
 347                 sin->sin_family = AF_INET;
 348                 sin->sin_addr.s_addr = skb->nh.iph->saddr;
 349                 sin->sin_port = 0;
 350                 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
 351                 if (inet->cmsg_flags)
 352                         ip_cmsg_recv(msg, skb);
 353         }
 354
 355         put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
 356
 357         /* Now we could try to dump offended packet options */
 358
 359         msg->msg_flags |= MSG_ERRQUEUE;
 360         err = copied;
 361
 362         /* Reset and regenerate socket error */
 363         spin_lock_bh(&sk->sk_error_queue.lock);
 364         sk->sk_err = 0;
 365         if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
 366                 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
 367                 spin_unlock_bh(&sk->sk_error_queue.lock);
 368                 sk->sk_error_report(sk);
 369         } else
 370                 spin_unlock_bh(&sk->sk_error_queue.lock);
 371
 372 out_free_skb:
 373         kfree_skb(skb);
 374 out:
 375         return err;
 376 }
 377
 378
 379 /*
 380  *      Socket option code for IP. This is the end of the line after any TCP,UDP etc options on
 381  *      an IP socket.
 382  */
 383
 384 int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, int optlen)
 385 {
 386         struct inet_sock *inet = inet_sk(sk);
 387         int val=0,err;
 388
 389         if (level != SOL_IP)
 390                 return -ENOPROTOOPT;
 391
 392         if (((1<<optname) & ((1<<IP_PKTINFO) | (1<<IP_RECVTTL) |
 393                             (1<<IP_RECVOPTS) | (1<<IP_RECVTOS) |
 394                             (1<<IP_RETOPTS) | (1<<IP_TOS) |
 395                             (1<<IP_TTL) | (1<<IP_HDRINCL) |
 396                             (1<<IP_MTU_DISCOVER) | (1<<IP_RECVERR) |
 397                             (1<<IP_ROUTER_ALERT) | (1<<IP_FREEBIND))) ||
 398                                 optname == IP_MULTICAST_TTL ||
 399                                 optname == IP_MULTICAST_LOOP) {
 400                 if (optlen >= sizeof(int)) {
 401                         if (get_user(val, (int __user *) optval))
 402                                 return -EFAULT;
 403                 } else if (optlen >= sizeof(char)) {
 404                         unsigned char ucval;
 405
 406                         if (get_user(ucval, (unsigned char __user *) optval))
 407                                 return -EFAULT;
 408                         val = (int) ucval;
 409                 }
 410         }
 411
 412         /* If optlen==0, it is equivalent to val == 0 */
 413
 414 #ifdef CONFIG_IP_MROUTE
 415         if (optname >= MRT_BASE && optname <= (MRT_BASE + 10))
 416                 return ip_mroute_setsockopt(sk,optname,optval,optlen);
 417 #endif
 418
 419         err = 0;
 420         lock_sock(sk);
 421
 422         switch (optname) {
 423                 case IP_OPTIONS:
 424                 {
 425                         struct ip_options * opt = NULL;
 426                         if (optlen > 40 || optlen < 0)
 427                                 goto e_inval;
 428                         err = ip_options_get(&opt, optval, optlen, 1);
 429                         if (err)
 430                                 break;
 431                         if (sk->sk_type == SOCK_STREAM) {
 432                                 struct tcp_sock *tp = tcp_sk(sk);
 433 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 434                                 if (sk->sk_family == PF_INET ||
 435                                     (!((1 << sk->sk_state) &
 436                                        (TCPF_LISTEN | TCPF_CLOSE)) &&
 437                                      inet->daddr != LOOPBACK4_IPV6)) {
 438 #endif
 439                                         if (inet->opt)
 440                                                 tp->ext_header_len -= inet->opt->optlen;
 441                                         if (opt)
 442                                                 tp->ext_header_len += opt->optlen;
 443                                         tcp_sync_mss(sk, tp->pmtu_cookie);
 444 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 445                                 }
 446 #endif
 447                         }
 448                         opt = xchg(&inet->opt, opt);
 449                         if (opt)
 450                                 kfree(opt);
 451                         break;
 452                 }
 453                 case IP_PKTINFO:
 454                         if (val)
 455                                 inet->cmsg_flags |= IP_CMSG_PKTINFO;
 456                         else
 457                                 inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
 458                         break;
 459                 case IP_RECVTTL:
 460                         if (val)
 461                                 inet->cmsg_flags |=  IP_CMSG_TTL;
 462                         else
 463                                 inet->cmsg_flags &= ~IP_CMSG_TTL;
 464                         break;
 465                 case IP_RECVTOS:
 466                         if (val)
 467                                 inet->cmsg_flags |=  IP_CMSG_TOS;
 468                         else
 469                                 inet->cmsg_flags &= ~IP_CMSG_TOS;
 470                         break;
 471                 case IP_RECVOPTS:
 472                         if (val)
 473                                 inet->cmsg_flags |=  IP_CMSG_RECVOPTS;
 474                         else
 475                                 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
 476                         break;
 477                 case IP_RETOPTS:
 478                         if (val)
 479                                 inet->cmsg_flags |= IP_CMSG_RETOPTS;
 480                         else
 481                                 inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
 482                         break;
 483                 case IP_TOS:    /* This sets both TOS and Precedence */
 484                         if (sk->sk_type == SOCK_STREAM) {
 485                                 val &= ~3;
 486                                 val |= inet->tos & 3;
 487                         }
 488                         if (IPTOS_PREC(val) >= IPTOS_PREC_CRITIC_ECP &&
 489                             !capable(CAP_NET_ADMIN)) {
 490                                 err = -EPERM;
 491                                 break;
 492                         }
 493                         if (inet->tos != val) {
 494                                 inet->tos = val;
 495                                 sk->sk_priority = rt_tos2priority(val);
 496                                 sk_dst_reset(sk);
 497                         }
 498                         break;
 499                 case IP_TTL:
 500                         if (optlen<1)
 501                                 goto e_inval;
 502                         if (val != -1 && (val < 1 || val>255))
 503                                 goto e_inval;
 504                         inet->uc_ttl = val;
 505                         break;
 506                 case IP_HDRINCL:
 507                         if (sk->sk_type != SOCK_RAW) {
 508                                 err = -ENOPROTOOPT;
 509                                 break;
 510                         }
 511                         inet->hdrincl = val ? 1 : 0;
 512                         break;
 513                 case IP_MTU_DISCOVER:
 514                         if (val<0 || val>2)
 515                                 goto e_inval;
 516                         inet->pmtudisc = val;
 517                         break;
 518                 case IP_RECVERR:
 519                         inet->recverr = !!val;
 520                         if (!val)
 521                                 skb_queue_purge(&sk->sk_error_queue);
 522                         break;
 523                 case IP_MULTICAST_TTL:
 524                         if (sk->sk_type == SOCK_STREAM)
 525                                 goto e_inval;
 526                         if (optlen<1)
 527                                 goto e_inval;
 528                         if (val==-1)
 529                                 val = 1;
 530                         if (val < 0 || val > 255)
 531                                 goto e_inval;
 532                         inet->mc_ttl = val;
 533                         break;
 534                 case IP_MULTICAST_LOOP:
 535                         if (optlen<1)
 536                                 goto e_inval;
 537                         inet->mc_loop = !!val;
 538                         break;
 539                 case IP_MULTICAST_IF:
 540                 {
 541                         struct ip_mreqn mreq;
 542                         struct net_device *dev = NULL;
 543
 544                         if (sk->sk_type == SOCK_STREAM)
 545                                 goto e_inval;
 546                         /*
 547                          *      Check the arguments are allowable
 548                          */
 549
 550                         err = -EFAULT;
 551                         if (optlen >= sizeof(struct ip_mreqn)) {
 552                                 if (copy_from_user(&mreq,optval,sizeof(mreq)))
 553                                         break;
 554                         } else {
 555                                 memset(&mreq, 0, sizeof(mreq));
 556                                 if (optlen >= sizeof(struct in_addr) &&
 557                                     copy_from_user(&mreq.imr_address,optval,sizeof(struct in_addr)))
 558                                         break;
 559                         }
 560
 561                         if (!mreq.imr_ifindex) {
 562                                 if (mreq.imr_address.s_addr == INADDR_ANY) {
 563                                         inet->mc_index = 0;
 564                                         inet->mc_addr  = 0;
 565                                         err = 0;
 566                                         break;
 567                                 }
 568                                 dev = ip_dev_find(mreq.imr_address.s_addr);
 569                                 if (dev) {
 570                                         mreq.imr_ifindex = dev->ifindex;
 571                                         dev_put(dev);
 572                                 }
 573                         } else
 574                                 dev = __dev_get_by_index(mreq.imr_ifindex);
 575
 576
 577                         err = -EADDRNOTAVAIL;
 578                         if (!dev)
 579                                 break;
 580
 581                         err = -EINVAL;
 582                         if (sk->sk_bound_dev_if &&
 583                             mreq.imr_ifindex != sk->sk_bound_dev_if)
 584                                 break;
 585
 586                         inet->mc_index = mreq.imr_ifindex;
 587                         inet->mc_addr  = mreq.imr_address.s_addr;
 588                         err = 0;
 589                         break;
 590                 }
 591
 592                 case IP_ADD_MEMBERSHIP:
 593                 case IP_DROP_MEMBERSHIP:
 594                 {
 595                         struct ip_mreqn mreq;
 596
 597                         if (optlen < sizeof(struct ip_mreq))
 598                                 goto e_inval;
 599                         err = -EFAULT;
 600                         if (optlen >= sizeof(struct ip_mreqn)) {
 601                                 if(copy_from_user(&mreq,optval,sizeof(mreq)))
 602                                         break;
 603                         } else {
 604                                 memset(&mreq, 0, sizeof(mreq));
 605                                 if (copy_from_user(&mreq,optval,sizeof(struct ip_mreq)))
 606                                         break;
 607                         }
 608
 609                         if (optname == IP_ADD_MEMBERSHIP)
 610                                 err = ip_mc_join_group(sk, &mreq);
 611                         else
 612                                 err = ip_mc_leave_group(sk, &mreq);
 613                         break;
 614                 }
 615                 case IP_MSFILTER:
 616                 {
 617                         extern int sysctl_optmem_max;
 618                         extern int sysctl_igmp_max_msf;
 619                         struct ip_msfilter *msf;
 620
 621                         if (optlen < IP_MSFILTER_SIZE(0))
 622                                 goto e_inval;
 623                         if (optlen > sysctl_optmem_max) {
 624                                 err = -ENOBUFS;
 625                                 break;
 626                         }
 627                         msf = (struct ip_msfilter *)kmalloc(optlen, GFP_KERNEL);
 628                         if (msf == 0) {
 629                                 err = -ENOBUFS;
 630                                 break;
 631                         }
 632                         err = -EFAULT;
 633                         if (copy_from_user(msf, optval, optlen)) {
 634                                 kfree(msf);
 635                                 break;
 636                         }
 637                         /* numsrc >= (1G-4) overflow in 32 bits */
 638                         if (msf->imsf_numsrc >= 0x3ffffffcU ||
 639                             msf->imsf_numsrc > sysctl_igmp_max_msf) {
 640                                 kfree(msf);
 641                                 err = -ENOBUFS;
 642                                 break;
 643                         }
 644                         if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
 645                                 kfree(msf);
 646                                 err = -EINVAL;
 647                                 break;
 648                         }
 649                         err = ip_mc_msfilter(sk, msf, 0);
 650                         kfree(msf);
 651                         break;
 652                 }
 653                 case IP_BLOCK_SOURCE:
 654                 case IP_UNBLOCK_SOURCE:
 655                 case IP_ADD_SOURCE_MEMBERSHIP:
 656                 case IP_DROP_SOURCE_MEMBERSHIP:
 657                 {
 658                         struct ip_mreq_source mreqs;
 659                         int omode, add;
 660
 661                         if (optlen != sizeof(struct ip_mreq_source))
 662                                 goto e_inval;
 663                         if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
 664                                 err = -EFAULT;
 665                                 break;
 666                         }
 667                         if (optname == IP_BLOCK_SOURCE) {
 668                                 omode = MCAST_EXCLUDE;
 669                                 add = 1;
 670                         } else if (optname == IP_UNBLOCK_SOURCE) {
 671                                 omode = MCAST_EXCLUDE;
 672                                 add = 0;
 673                         } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
 674                                 struct ip_mreqn mreq;
 675
 676                                 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
 677                                 mreq.imr_address.s_addr = mreqs.imr_interface;
 678                                 mreq.imr_ifindex = 0;
 679                                 err = ip_mc_join_group(sk, &mreq);
 680                                 if (err && err != -EADDRINUSE)
 681                                         break;
 682                                 omode = MCAST_INCLUDE;
 683                                 add = 1;
 684                         } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
 685                                 omode = MCAST_INCLUDE;
 686                                 add = 0;
 687                         }
 688                         err = ip_mc_source(add, omode, sk, &mreqs, 0);
 689                         break;
 690                 }
 691                 case MCAST_JOIN_GROUP:
 692                 case MCAST_LEAVE_GROUP:
 693                 {
 694                         struct group_req greq;
 695                         struct sockaddr_in *psin;
 696                         struct ip_mreqn mreq;
 697
 698                         if (optlen < sizeof(struct group_req))
 699                                 goto e_inval;
 700                         err = -EFAULT;
 701                         if(copy_from_user(&greq, optval, sizeof(greq)))
 702                                 break;
 703                         psin = (struct sockaddr_in *)&greq.gr_group;
 704                         if (psin->sin_family != AF_INET)
 705                                 goto e_inval;
 706                         memset(&mreq, 0, sizeof(mreq));
 707                         mreq.imr_multiaddr = psin->sin_addr;
 708                         mreq.imr_ifindex = greq.gr_interface;
 709
 710                         if (optname == MCAST_JOIN_GROUP)
 711                                 err = ip_mc_join_group(sk, &mreq);
 712                         else
 713                                 err = ip_mc_leave_group(sk, &mreq);
 714                         break;
 715                 }
 716                 case MCAST_JOIN_SOURCE_GROUP:
 717                 case MCAST_LEAVE_SOURCE_GROUP:
 718                 case MCAST_BLOCK_SOURCE:
 719                 case MCAST_UNBLOCK_SOURCE:
 720                 {
 721                         struct group_source_req greqs;
 722                         struct ip_mreq_source mreqs;
 723                         struct sockaddr_in *psin;
 724                         int omode, add;
 725
 726                         if (optlen != sizeof(struct group_source_req))
 727                                 goto e_inval;
 728                         if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 729                                 err = -EFAULT;
 730                                 break;
 731                         }
 732                         if (greqs.gsr_group.ss_family != AF_INET ||
 733                             greqs.gsr_source.ss_family != AF_INET) {
 734                                 err = -EADDRNOTAVAIL;
 735                                 break;
 736                         }
 737                         psin = (struct sockaddr_in *)&greqs.gsr_group;
 738                         mreqs.imr_multiaddr = psin->sin_addr.s_addr;
 739                         psin = (struct sockaddr_in *)&greqs.gsr_source;
 740                         mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
 741                         mreqs.imr_interface = 0; /* use index for mc_source */
 742
 743                         if (optname == MCAST_BLOCK_SOURCE) {
 744                                 omode = MCAST_EXCLUDE;
 745                                 add = 1;
 746                         } else if (optname == MCAST_UNBLOCK_SOURCE) {
 747                                 omode = MCAST_EXCLUDE;
 748                                 add = 0;
 749                         } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 750                                 struct ip_mreqn mreq;
 751
 752                                 psin = (struct sockaddr_in *)&greqs.gsr_group;
 753                                 mreq.imr_multiaddr = psin->sin_addr;
 754                                 mreq.imr_address.s_addr = 0;
 755                                 mreq.imr_ifindex = greqs.gsr_interface;
 756                                 err = ip_mc_join_group(sk, &mreq);
 757                                 if (err && err != -EADDRINUSE)
 758                                         break;
 759                                 greqs.gsr_interface = mreq.imr_ifindex;
 760                                 omode = MCAST_INCLUDE;
 761                                 add = 1;
 762                         } else /* MCAST_LEAVE_SOURCE_GROUP */ {
 763                                 omode = MCAST_INCLUDE;
 764                                 add = 0;
 765                         }
 766                         err = ip_mc_source(add, omode, sk, &mreqs,
 767                                 greqs.gsr_interface);
 768                         break;
 769                 }
 770                 case MCAST_MSFILTER:
 771                 {
 772                         extern int sysctl_optmem_max;
 773                         extern int sysctl_igmp_max_msf;
 774                         struct sockaddr_in *psin;
 775                         struct ip_msfilter *msf = NULL;
 776                         struct group_filter *gsf = NULL;
 777                         int msize, i, ifindex;
 778
 779                         if (optlen < GROUP_FILTER_SIZE(0))
 780                                 goto e_inval;
 781                         if (optlen > sysctl_optmem_max) {
 782                                 err = -ENOBUFS;
 783                                 break;
 784                         }
 785                         gsf = (struct group_filter *)kmalloc(optlen,GFP_KERNEL);
 786                         if (gsf == 0) {
 787                                 err = -ENOBUFS;
 788                                 break;
 789                         }
 790                         err = -EFAULT;
 791                         if (copy_from_user(gsf, optval, optlen)) {
 792                                 goto mc_msf_out;
 793                         }
 794                         /* numsrc >= (4G-140)/128 overflow in 32 bits */
 795                         if (gsf->gf_numsrc >= 0x1ffffff ||
 796                             gsf->gf_numsrc > sysctl_igmp_max_msf) {
 797                                 err = -ENOBUFS;
 798                                 goto mc_msf_out;
 799                         }
 800                         if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 801                                 err = -EINVAL;
 802                                 goto mc_msf_out;
 803                         }
 804                         msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
 805                         msf = (struct ip_msfilter *)kmalloc(msize,GFP_KERNEL);
 806                         if (msf == 0) {
 807                                 err = -ENOBUFS;
 808                                 goto mc_msf_out;
 809                         }
 810                         ifindex = gsf->gf_interface;
 811                         psin = (struct sockaddr_in *)&gsf->gf_group;
 812                         if (psin->sin_family != AF_INET) {
 813                                 err = -EADDRNOTAVAIL;
 814                                 goto mc_msf_out;
 815                         }
 816                         msf->imsf_multiaddr = psin->sin_addr.s_addr;
 817                         msf->imsf_interface = 0;
 818                         msf->imsf_fmode = gsf->gf_fmode;
 819                         msf->imsf_numsrc = gsf->gf_numsrc;
 820                         err = -EADDRNOTAVAIL;
 821                         for (i=0; i<gsf->gf_numsrc; ++i) {
 822                                 psin = (struct sockaddr_in *)&gsf->gf_slist[i];
 823
 824                                 if (psin->sin_family != AF_INET)
 825                                         goto mc_msf_out;
 826                                 msf->imsf_slist[i] = psin->sin_addr.s_addr;
 827                         }
 828                         kfree(gsf);
 829                         gsf = NULL;
 830
 831                         err = ip_mc_msfilter(sk, msf, ifindex);
 832 mc_msf_out:
 833                         if (msf)
 834                                 kfree(msf);
 835                         if (gsf)
 836                                 kfree(gsf);
 837                         break;
 838                 }
 839                 case IP_ROUTER_ALERT:
 840                         err = ip_ra_control(sk, val ? 1 : 0, NULL);
 841                         break;
 842
 843                 case IP_FREEBIND:
 844                         if (optlen<1)
 845                                 goto e_inval;
 846                         inet->freebind = !!val;
 847                         break;
 848
 849                 case IP_IPSEC_POLICY:
 850                 case IP_XFRM_POLICY:
 851                         err = -EPERM;
 852                         if (!capable(CAP_NET_ADMIN))
 853                                 break;
 854                         err = xfrm_user_policy(sk, optname, optval, optlen);
 855                         break;
 856
 857                 default:
 858 #ifdef CONFIG_NETFILTER
 859                         err = nf_setsockopt(sk, PF_INET, optname, optval,
 860                                             optlen);
 861 #else
 862                         err = -ENOPROTOOPT;
 863 #endif
 864                         break;
 865         }
 866         release_sock(sk);
 867         return err;
 868
 869 e_inval:
 870         release_sock(sk);
 871         return -EINVAL;
 872 }
 873
 874 /*
 875  *      Get the options. Note for future reference. The GET of IP options gets the
 876  *      _received_ ones. The set sets the _sent_ ones.
 877  */
 878
 879 int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, int __user *optlen)
 880 {
 881         struct inet_sock *inet = inet_sk(sk);
 882         int val;
 883         int len;
 884
 885         if(level!=SOL_IP)
 886                 return -EOPNOTSUPP;
 887
 888 #ifdef CONFIG_IP_MROUTE
 889         if(optname>=MRT_BASE && optname <=MRT_BASE+10)
 890         {
 891                 return ip_mroute_getsockopt(sk,optname,optval,optlen);
 892         }
 893 #endif
 894
 895         if(get_user(len,optlen))
 896                 return -EFAULT;
 897         if(len < 0)
 898                 return -EINVAL;
 899
 900         lock_sock(sk);
 901
 902         switch(optname) {
 903                 case IP_OPTIONS:
 904                         {
 905                                 unsigned char optbuf[sizeof(struct ip_options)+40];
 906                                 struct ip_options * opt = (struct ip_options*)optbuf;
 907                                 opt->optlen = 0;
 908                                 if (inet->opt)
 909                                         memcpy(optbuf, inet->opt,
 910                                                sizeof(struct ip_options)+
 911                                                inet->opt->optlen);
 912                                 release_sock(sk);
 913
 914                                 if (opt->optlen == 0)
 915                                         return put_user(0, optlen);
 916
 917                                 ip_options_undo(opt);
 918
 919                                 len = min_t(unsigned int, len, opt->optlen);
 920                                 if(put_user(len, optlen))
 921                                         return -EFAULT;
 922                                 if(copy_to_user(optval, opt->__data, len))
 923                                         return -EFAULT;
 924                                 return 0;
 925                         }
 926                 case IP_PKTINFO:
 927                         val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
 928                         break;
 929                 case IP_RECVTTL:
 930                         val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
 931                         break;
 932                 case IP_RECVTOS:
 933                         val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
 934                         break;
 935                 case IP_RECVOPTS:
 936                         val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
 937                         break;
 938                 case IP_RETOPTS:
 939                         val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
 940                         break;
 941                 case IP_TOS:
 942                         val = inet->tos;
 943                         break;
 944                 case IP_TTL:
 945                         val = (inet->uc_ttl == -1 ?
 946                                sysctl_ip_default_ttl :
 947                                inet->uc_ttl);
 948                         break;
 949                 case IP_HDRINCL:
 950                         val = inet->hdrincl;
 951                         break;
 952                 case IP_MTU_DISCOVER:
 953                         val = inet->pmtudisc;
 954                         break;
 955                 case IP_MTU:
 956                 {
 957                         struct dst_entry *dst;
 958                         val = 0;
 959                         dst = sk_dst_get(sk);
 960                         if (dst) {
 961                                 val = dst_mtu(dst);
 962                                 dst_release(dst);
 963                         }
 964                         if (!val) {
 965                                 release_sock(sk);
 966                                 return -ENOTCONN;
 967                         }
 968                         break;
 969                 }
 970                 case IP_RECVERR:
 971                         val = inet->recverr;
 972                         break;
 973                 case IP_MULTICAST_TTL:
 974                         val = inet->mc_ttl;
 975                         break;
 976                 case IP_MULTICAST_LOOP:
 977                         val = inet->mc_loop;
 978                         break;
 979                 case IP_MULTICAST_IF:
 980                 {
 981                         struct in_addr addr;
 982                         len = min_t(unsigned int, len, sizeof(struct in_addr));
 983                         addr.s_addr = inet->mc_addr;
 984                         release_sock(sk);
 985
 986                         if(put_user(len, optlen))
 987                                 return -EFAULT;
 988                         if(copy_to_user(optval, &addr, len))
 989                                 return -EFAULT;
 990                         return 0;
 991                 }
 992                 case IP_MSFILTER:
 993                 {
 994                         struct ip_msfilter msf;
 995                         int err;
 996
 997                         if (len < IP_MSFILTER_SIZE(0)) {
 998                                 release_sock(sk);
 999                                 return -EINVAL;
1000                         }
1001                         if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
1002                                 release_sock(sk);
1003                                 return -EFAULT;
1004                         }
1005                         err = ip_mc_msfget(sk, &msf,
1006                                 (struct ip_msfilter __user *)optval, optlen);
1007                         release_sock(sk);
1008                         return err;
1009                 }
1010                 case MCAST_MSFILTER:
1011                 {
1012                         struct group_filter gsf;
1013                         int err;
1014
1015                         if (len < GROUP_FILTER_SIZE(0)) {
1016                                 release_sock(sk);
1017                                 return -EINVAL;
1018                         }
1019                         if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
1020                                 release_sock(sk);
1021                                 return -EFAULT;
1022                         }
1023                         err = ip_mc_gsfget(sk, &gsf,
1024                                 (struct group_filter __user *)optval, optlen);
1025                         release_sock(sk);
1026                         return err;
1027                 }
1028                 case IP_PKTOPTIONS:
1029                 {
1030                         struct msghdr msg;
1031
1032                         release_sock(sk);
1033
1034                         if (sk->sk_type != SOCK_STREAM)
1035                                 return -ENOPROTOOPT;
1036
1037                         msg.msg_control = optval;
1038                         msg.msg_controllen = len;
1039                         msg.msg_flags = 0;
1040
1041                         if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
1042                                 struct in_pktinfo info;
1043
1044                                 info.ipi_addr.s_addr = inet->rcv_saddr;
1045                                 info.ipi_spec_dst.s_addr = inet->rcv_saddr;
1046                                 info.ipi_ifindex = inet->mc_index;
1047                                 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
1048                         }
1049                         if (inet->cmsg_flags & IP_CMSG_TTL) {
1050                                 int hlim = inet->mc_ttl;
1051                                 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
1052                         }
1053                         len -= msg.msg_controllen;
1054                         return put_user(len, optlen);
1055                 }
1056                 case IP_FREEBIND:
1057                         val = inet->freebind;
1058                         break;
1059                 default:
1060 #ifdef CONFIG_NETFILTER
1061                         val = nf_getsockopt(sk, PF_INET, optname, optval,
1062                                             &len);
1063                         release_sock(sk);
1064                         if (val >= 0)
1065                                 val = put_user(len, optlen);
1066                         return val;
1067 #else
1068                         release_sock(sk);
1069                         return -ENOPROTOOPT;
1070 #endif
1071         }
1072         release_sock(sk);
1073
1074         if (len < sizeof(int) && len > 0 && val>=0 && val<255) {
1075                 unsigned char ucval = (unsigned char)val;
1076                 len = 1;
1077                 if(put_user(len, optlen))
1078                         return -EFAULT;
1079                 if(copy_to_user(optval,&ucval,1))
1080                         return -EFAULT;
1081         } else {
1082                 len = min_t(unsigned int, sizeof(int), len);
1083                 if(put_user(len, optlen))
1084                         return -EFAULT;
1085                 if(copy_to_user(optval,&val,len))
1086                         return -EFAULT;
1087         }
1088         return 0;
1089 }
1090
1091 EXPORT_SYMBOL(ip_cmsg_recv);
1092
1093 #ifdef CONFIG_IP_SCTP_MODULE
1094 EXPORT_SYMBOL(ip_getsockopt);
1095 EXPORT_SYMBOL(ip_setsockopt);
1096 #endif