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/inetdevice.h>
  29 #include <linux/netdevice.h>
  30 #include <net/sock.h>
  31 #include <net/ip.h>
  32 #include <net/icmp.h>
  33 #include <net/tcp_states.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 #define IP_CMSG_PASSSEC         32
  54
  55 /*
  56  *      SOL_IP control messages.
  57  */
  58
  59 static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb)
  60 {
  61         struct in_pktinfo info;
  62         struct rtable *rt = (struct rtable *)skb->dst;
  63
  64         info.ipi_addr.s_addr = skb->nh.iph->daddr;
  65         if (rt) {
  66                 info.ipi_ifindex = rt->rt_iif;
  67                 info.ipi_spec_dst.s_addr = rt->rt_spec_dst;
  68         } else {
  69                 info.ipi_ifindex = 0;
  70                 info.ipi_spec_dst.s_addr = 0;
  71         }
  72
  73         put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
  74 }
  75
  76 static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb)
  77 {
  78         int ttl = skb->nh.iph->ttl;
  79         put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl);
  80 }
  81
  82 static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb)
  83 {
  84         put_cmsg(msg, SOL_IP, IP_TOS, 1, &skb->nh.iph->tos);
  85 }
  86
  87 static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb)
  88 {
  89         if (IPCB(skb)->opt.optlen == 0)
  90                 return;
  91
  92         put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen, skb->nh.iph+1);
  93 }
  94
  95
  96 static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb)
  97 {
  98         unsigned char optbuf[sizeof(struct ip_options) + 40];
  99         struct ip_options * opt = (struct ip_options*)optbuf;
 100
 101         if (IPCB(skb)->opt.optlen == 0)
 102                 return;
 103
 104         if (ip_options_echo(opt, skb)) {
 105                 msg->msg_flags |= MSG_CTRUNC;
 106                 return;
 107         }
 108         ip_options_undo(opt);
 109
 110         put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data);
 111 }
 112
 113 static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
 114 {
 115         char *secdata;
 116         u32 seclen;
 117         int err;
 118
 119         err = security_socket_getpeersec_dgram(skb, &secdata, &seclen);
 120         if (err)
 121                 return;
 122
 123         put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata);
 124 }
 125
 126
 127 void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
 128 {
 129         struct inet_sock *inet = inet_sk(skb->sk);
 130         unsigned flags = inet->cmsg_flags;
 131
 132         /* Ordered by supposed usage frequency */
 133         if (flags & 1)
 134                 ip_cmsg_recv_pktinfo(msg, skb);
 135         if ((flags>>=1) == 0)
 136                 return;
 137
 138         if (flags & 1)
 139                 ip_cmsg_recv_ttl(msg, skb);
 140         if ((flags>>=1) == 0)
 141                 return;
 142
 143         if (flags & 1)
 144                 ip_cmsg_recv_tos(msg, skb);
 145         if ((flags>>=1) == 0)
 146                 return;
 147
 148         if (flags & 1)
 149                 ip_cmsg_recv_opts(msg, skb);
 150         if ((flags>>=1) == 0)
 151                 return;
 152
 153         if (flags & 1)
 154                 ip_cmsg_recv_retopts(msg, skb);
 155         if ((flags>>=1) == 0)
 156                 return;
 157
 158         if (flags & 1)
 159                 ip_cmsg_recv_security(msg, skb);
 160 }
 161
 162 int ip_cmsg_send(struct msghdr *msg, struct ipcm_cookie *ipc)
 163 {
 164         int err;
 165         struct cmsghdr *cmsg;
 166
 167         for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
 168                 if (!CMSG_OK(msg, cmsg))
 169                         return -EINVAL;
 170                 if (cmsg->cmsg_level != SOL_IP)
 171                         continue;
 172                 switch (cmsg->cmsg_type) {
 173                 case IP_RETOPTS:
 174                         err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
 175                         err = ip_options_get(&ipc->opt, CMSG_DATA(cmsg), err < 40 ? err : 40);
 176                         if (err)
 177                                 return err;
 178                         break;
 179                 case IP_PKTINFO:
 180                 {
 181                         struct in_pktinfo *info;
 182                         if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
 183                                 return -EINVAL;
 184                         info = (struct in_pktinfo *)CMSG_DATA(cmsg);
 185                         ipc->oif = info->ipi_ifindex;
 186                         ipc->addr = info->ipi_spec_dst.s_addr;
 187                         break;
 188                 }
 189                 default:
 190                         return -EINVAL;
 191                 }
 192         }
 193         return 0;
 194 }
 195
 196
 197 /* Special input handler for packets caught by router alert option.
 198    They are selected only by protocol field, and then processed likely
 199    local ones; but only if someone wants them! Otherwise, router
 200    not running rsvpd will kill RSVP.
 201
 202    It is user level problem, what it will make with them.
 203    I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
 204    but receiver should be enough clever f.e. to forward mtrace requests,
 205    sent to multicast group to reach destination designated router.
 206  */
 207 struct ip_ra_chain *ip_ra_chain;
 208 DEFINE_RWLOCK(ip_ra_lock);
 209
 210 int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *))
 211 {
 212         struct ip_ra_chain *ra, *new_ra, **rap;
 213
 214         if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num == IPPROTO_RAW)
 215                 return -EINVAL;
 216
 217         new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
 218
 219         write_lock_bh(&ip_ra_lock);
 220         for (rap = &ip_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
 221                 if (ra->sk == sk) {
 222                         if (on) {
 223                                 write_unlock_bh(&ip_ra_lock);
 224                                 kfree(new_ra);
 225                                 return -EADDRINUSE;
 226                         }
 227                         *rap = ra->next;
 228                         write_unlock_bh(&ip_ra_lock);
 229
 230                         if (ra->destructor)
 231                                 ra->destructor(sk);
 232                         sock_put(sk);
 233                         kfree(ra);
 234                         return 0;
 235                 }
 236         }
 237         if (new_ra == NULL) {
 238                 write_unlock_bh(&ip_ra_lock);
 239                 return -ENOBUFS;
 240         }
 241         new_ra->sk = sk;
 242         new_ra->destructor = destructor;
 243
 244         new_ra->next = ra;
 245         *rap = new_ra;
 246         sock_hold(sk);
 247         write_unlock_bh(&ip_ra_lock);
 248
 249         return 0;
 250 }
 251
 252 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
 253                    u16 port, u32 info, u8 *payload)
 254 {
 255         struct inet_sock *inet = inet_sk(sk);
 256         struct sock_exterr_skb *serr;
 257
 258         if (!inet->recverr)
 259                 return;
 260
 261         skb = skb_clone(skb, GFP_ATOMIC);
 262         if (!skb)
 263                 return;
 264
 265         serr = SKB_EXT_ERR(skb);
 266         serr->ee.ee_errno = err;
 267         serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
 268         serr->ee.ee_type = skb->h.icmph->type;
 269         serr->ee.ee_code = skb->h.icmph->code;
 270         serr->ee.ee_pad = 0;
 271         serr->ee.ee_info = info;
 272         serr->ee.ee_data = 0;
 273         serr->addr_offset = (u8*)&(((struct iphdr*)(skb->h.icmph+1))->daddr) - skb->nh.raw;
 274         serr->port = port;
 275
 276         skb->h.raw = payload;
 277         if (!skb_pull(skb, payload - skb->data) ||
 278             sock_queue_err_skb(sk, skb))
 279                 kfree_skb(skb);
 280 }
 281
 282 void ip_local_error(struct sock *sk, int err, u32 daddr, u16 port, u32 info)
 283 {
 284         struct inet_sock *inet = inet_sk(sk);
 285         struct sock_exterr_skb *serr;
 286         struct iphdr *iph;
 287         struct sk_buff *skb;
 288
 289         if (!inet->recverr)
 290                 return;
 291
 292         skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
 293         if (!skb)
 294                 return;
 295
 296         iph = (struct iphdr*)skb_put(skb, sizeof(struct iphdr));
 297         skb->nh.iph = iph;
 298         iph->daddr = daddr;
 299
 300         serr = SKB_EXT_ERR(skb);
 301         serr->ee.ee_errno = err;
 302         serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
 303         serr->ee.ee_type = 0;
 304         serr->ee.ee_code = 0;
 305         serr->ee.ee_pad = 0;
 306         serr->ee.ee_info = info;
 307         serr->ee.ee_data = 0;
 308         serr->addr_offset = (u8*)&iph->daddr - skb->nh.raw;
 309         serr->port = port;
 310
 311         skb->h.raw = skb->tail;
 312         __skb_pull(skb, skb->tail - skb->data);
 313
 314         if (sock_queue_err_skb(sk, skb))
 315                 kfree_skb(skb);
 316 }
 317
 318 /*
 319  *      Handle MSG_ERRQUEUE
 320  */
 321 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len)
 322 {
 323         struct sock_exterr_skb *serr;
 324         struct sk_buff *skb, *skb2;
 325         struct sockaddr_in *sin;
 326         struct {
 327                 struct sock_extended_err ee;
 328                 struct sockaddr_in       offender;
 329         } errhdr;
 330         int err;
 331         int copied;
 332
 333         err = -EAGAIN;
 334         skb = skb_dequeue(&sk->sk_error_queue);
 335         if (skb == NULL)
 336                 goto out;
 337
 338         copied = skb->len;
 339         if (copied > len) {
 340                 msg->msg_flags |= MSG_TRUNC;
 341                 copied = len;
 342         }
 343         err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
 344         if (err)
 345                 goto out_free_skb;
 346
 347         sock_recv_timestamp(msg, sk, skb);
 348
 349         serr = SKB_EXT_ERR(skb);
 350
 351         sin = (struct sockaddr_in *)msg->msg_name;
 352         if (sin) {
 353                 sin->sin_family = AF_INET;
 354                 sin->sin_addr.s_addr = *(u32*)(skb->nh.raw + serr->addr_offset);
 355                 sin->sin_port = serr->port;
 356                 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
 357         }
 358
 359         memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
 360         sin = &errhdr.offender;
 361         sin->sin_family = AF_UNSPEC;
 362         if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) {
 363                 struct inet_sock *inet = inet_sk(sk);
 364
 365                 sin->sin_family = AF_INET;
 366                 sin->sin_addr.s_addr = skb->nh.iph->saddr;
 367                 sin->sin_port = 0;
 368                 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
 369                 if (inet->cmsg_flags)
 370                         ip_cmsg_recv(msg, skb);
 371         }
 372
 373         put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
 374
 375         /* Now we could try to dump offended packet options */
 376
 377         msg->msg_flags |= MSG_ERRQUEUE;
 378         err = copied;
 379
 380         /* Reset and regenerate socket error */
 381         spin_lock_bh(&sk->sk_error_queue.lock);
 382         sk->sk_err = 0;
 383         if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
 384                 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
 385                 spin_unlock_bh(&sk->sk_error_queue.lock);
 386                 sk->sk_error_report(sk);
 387         } else
 388                 spin_unlock_bh(&sk->sk_error_queue.lock);
 389
 390 out_free_skb:
 391         kfree_skb(skb);
 392 out:
 393         return err;
 394 }
 395
 396
 397 /*
 398  *      Socket option code for IP. This is the end of the line after any TCP,UDP etc options on
 399  *      an IP socket.
 400  */
 401
 402 static int do_ip_setsockopt(struct sock *sk, int level,
 403                 int optname, char __user *optval, int optlen)
 404 {
 405         struct inet_sock *inet = inet_sk(sk);
 406         int val=0,err;
 407
 408         if (((1<<optname) & ((1<<IP_PKTINFO) | (1<<IP_RECVTTL) |
 409                             (1<<IP_RECVOPTS) | (1<<IP_RECVTOS) |
 410                             (1<<IP_RETOPTS) | (1<<IP_TOS) |
 411                             (1<<IP_TTL) | (1<<IP_HDRINCL) |
 412                             (1<<IP_MTU_DISCOVER) | (1<<IP_RECVERR) |
 413                             (1<<IP_ROUTER_ALERT) | (1<<IP_FREEBIND) |
 414                             (1<<IP_PASSSEC))) ||
 415                                 optname == IP_MULTICAST_TTL ||
 416                                 optname == IP_MULTICAST_LOOP) {
 417                 if (optlen >= sizeof(int)) {
 418                         if (get_user(val, (int __user *) optval))
 419                                 return -EFAULT;
 420                 } else if (optlen >= sizeof(char)) {
 421                         unsigned char ucval;
 422
 423                         if (get_user(ucval, (unsigned char __user *) optval))
 424                                 return -EFAULT;
 425                         val = (int) ucval;
 426                 }
 427         }
 428
 429         /* If optlen==0, it is equivalent to val == 0 */
 430
 431 #ifdef CONFIG_IP_MROUTE
 432         if (optname >= MRT_BASE && optname <= (MRT_BASE + 10))
 433                 return ip_mroute_setsockopt(sk,optname,optval,optlen);
 434 #endif
 435
 436         err = 0;
 437         lock_sock(sk);
 438
 439         switch (optname) {
 440                 case IP_OPTIONS:
 441                 {
 442                         struct ip_options * opt = NULL;
 443                         if (optlen > 40 || optlen < 0)
 444                                 goto e_inval;
 445                         err = ip_options_get_from_user(&opt, optval, optlen);
 446                         if (err)
 447                                 break;
 448                         if (inet->is_icsk) {
 449                                 struct inet_connection_sock *icsk = inet_csk(sk);
 450 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 451                                 if (sk->sk_family == PF_INET ||
 452                                     (!((1 << sk->sk_state) &
 453                                        (TCPF_LISTEN | TCPF_CLOSE)) &&
 454                                      inet->daddr != LOOPBACK4_IPV6)) {
 455 #endif
 456                                         if (inet->opt)
 457                                                 icsk->icsk_ext_hdr_len -= inet->opt->optlen;
 458                                         if (opt)
 459                                                 icsk->icsk_ext_hdr_len += opt->optlen;
 460                                         icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
 461 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 462                                 }
 463 #endif
 464                         }
 465                         opt = xchg(&inet->opt, opt);
 466                         kfree(opt);
 467                         break;
 468                 }
 469                 case IP_PKTINFO:
 470                         if (val)
 471                                 inet->cmsg_flags |= IP_CMSG_PKTINFO;
 472                         else
 473                                 inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
 474                         break;
 475                 case IP_RECVTTL:
 476                         if (val)
 477                                 inet->cmsg_flags |=  IP_CMSG_TTL;
 478                         else
 479                                 inet->cmsg_flags &= ~IP_CMSG_TTL;
 480                         break;
 481                 case IP_RECVTOS:
 482                         if (val)
 483                                 inet->cmsg_flags |=  IP_CMSG_TOS;
 484                         else
 485                                 inet->cmsg_flags &= ~IP_CMSG_TOS;
 486                         break;
 487                 case IP_RECVOPTS:
 488                         if (val)
 489                                 inet->cmsg_flags |=  IP_CMSG_RECVOPTS;
 490                         else
 491                                 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
 492                         break;
 493                 case IP_RETOPTS:
 494                         if (val)
 495                                 inet->cmsg_flags |= IP_CMSG_RETOPTS;
 496                         else
 497                                 inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
 498                         break;
 499                 case IP_PASSSEC:
 500                         if (val)
 501                                 inet->cmsg_flags |= IP_CMSG_PASSSEC;
 502                         else
 503                                 inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
 504                         break;
 505                 case IP_TOS:    /* This sets both TOS and Precedence */
 506                         if (sk->sk_type == SOCK_STREAM) {
 507                                 val &= ~3;
 508                                 val |= inet->tos & 3;
 509                         }
 510                         if (IPTOS_PREC(val) >= IPTOS_PREC_CRITIC_ECP &&
 511                             !capable(CAP_NET_ADMIN)) {
 512                                 err = -EPERM;
 513                                 break;
 514                         }
 515                         if (inet->tos != val) {
 516                                 inet->tos = val;
 517                                 sk->sk_priority = rt_tos2priority(val);
 518                                 sk_dst_reset(sk);
 519                         }
 520                         break;
 521                 case IP_TTL:
 522                         if (optlen<1)
 523                                 goto e_inval;
 524                         if (val != -1 && (val < 1 || val>255))
 525                                 goto e_inval;
 526                         inet->uc_ttl = val;
 527                         break;
 528                 case IP_HDRINCL:
 529                         if (sk->sk_type != SOCK_RAW) {
 530                                 err = -ENOPROTOOPT;
 531                                 break;
 532                         }
 533                         inet->hdrincl = val ? 1 : 0;
 534                         break;
 535                 case IP_MTU_DISCOVER:
 536                         if (val<0 || val>2)
 537                                 goto e_inval;
 538                         inet->pmtudisc = val;
 539                         break;
 540                 case IP_RECVERR:
 541                         inet->recverr = !!val;
 542                         if (!val)
 543                                 skb_queue_purge(&sk->sk_error_queue);
 544                         break;
 545                 case IP_MULTICAST_TTL:
 546                         if (sk->sk_type == SOCK_STREAM)
 547                                 goto e_inval;
 548                         if (optlen<1)
 549                                 goto e_inval;
 550                         if (val==-1)
 551                                 val = 1;
 552                         if (val < 0 || val > 255)
 553                                 goto e_inval;
 554                         inet->mc_ttl = val;
 555                         break;
 556                 case IP_MULTICAST_LOOP:
 557                         if (optlen<1)
 558                                 goto e_inval;
 559                         inet->mc_loop = !!val;
 560                         break;
 561                 case IP_MULTICAST_IF:
 562                 {
 563                         struct ip_mreqn mreq;
 564                         struct net_device *dev = NULL;
 565
 566                         if (sk->sk_type == SOCK_STREAM)
 567                                 goto e_inval;
 568                         /*
 569                          *      Check the arguments are allowable
 570                          */
 571
 572                         err = -EFAULT;
 573                         if (optlen >= sizeof(struct ip_mreqn)) {
 574                                 if (copy_from_user(&mreq,optval,sizeof(mreq)))
 575                                         break;
 576                         } else {
 577                                 memset(&mreq, 0, sizeof(mreq));
 578                                 if (optlen >= sizeof(struct in_addr) &&
 579                                     copy_from_user(&mreq.imr_address,optval,sizeof(struct in_addr)))
 580                                         break;
 581                         }
 582
 583                         if (!mreq.imr_ifindex) {
 584                                 if (mreq.imr_address.s_addr == INADDR_ANY) {
 585                                         inet->mc_index = 0;
 586                                         inet->mc_addr  = 0;
 587                                         err = 0;
 588                                         break;
 589                                 }
 590                                 dev = ip_dev_find(mreq.imr_address.s_addr);
 591                                 if (dev) {
 592                                         mreq.imr_ifindex = dev->ifindex;
 593                                         dev_put(dev);
 594                                 }
 595                         } else
 596                                 dev = __dev_get_by_index(mreq.imr_ifindex);
 597
 598
 599                         err = -EADDRNOTAVAIL;
 600                         if (!dev)
 601                                 break;
 602
 603                         err = -EINVAL;
 604                         if (sk->sk_bound_dev_if &&
 605                             mreq.imr_ifindex != sk->sk_bound_dev_if)
 606                                 break;
 607
 608                         inet->mc_index = mreq.imr_ifindex;
 609                         inet->mc_addr  = mreq.imr_address.s_addr;
 610                         err = 0;
 611                         break;
 612                 }
 613
 614                 case IP_ADD_MEMBERSHIP:
 615                 case IP_DROP_MEMBERSHIP:
 616                 {
 617                         struct ip_mreqn mreq;
 618
 619                         if (optlen < sizeof(struct ip_mreq))
 620                                 goto e_inval;
 621                         err = -EFAULT;
 622                         if (optlen >= sizeof(struct ip_mreqn)) {
 623                                 if(copy_from_user(&mreq,optval,sizeof(mreq)))
 624                                         break;
 625                         } else {
 626                                 memset(&mreq, 0, sizeof(mreq));
 627                                 if (copy_from_user(&mreq,optval,sizeof(struct ip_mreq)))
 628                                         break;
 629                         }
 630
 631                         if (optname == IP_ADD_MEMBERSHIP)
 632                                 err = ip_mc_join_group(sk, &mreq);
 633                         else
 634                                 err = ip_mc_leave_group(sk, &mreq);
 635                         break;
 636                 }
 637                 case IP_MSFILTER:
 638                 {
 639                         extern int sysctl_igmp_max_msf;
 640                         struct ip_msfilter *msf;
 641
 642                         if (optlen < IP_MSFILTER_SIZE(0))
 643                                 goto e_inval;
 644                         if (optlen > sysctl_optmem_max) {
 645                                 err = -ENOBUFS;
 646                                 break;
 647                         }
 648                         msf = kmalloc(optlen, GFP_KERNEL);
 649                         if (msf == 0) {
 650                                 err = -ENOBUFS;
 651                                 break;
 652                         }
 653                         err = -EFAULT;
 654                         if (copy_from_user(msf, optval, optlen)) {
 655                                 kfree(msf);
 656                                 break;
 657                         }
 658                         /* numsrc >= (1G-4) overflow in 32 bits */
 659                         if (msf->imsf_numsrc >= 0x3ffffffcU ||
 660                             msf->imsf_numsrc > sysctl_igmp_max_msf) {
 661                                 kfree(msf);
 662                                 err = -ENOBUFS;
 663                                 break;
 664                         }
 665                         if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
 666                                 kfree(msf);
 667                                 err = -EINVAL;
 668                                 break;
 669                         }
 670                         err = ip_mc_msfilter(sk, msf, 0);
 671                         kfree(msf);
 672                         break;
 673                 }
 674                 case IP_BLOCK_SOURCE:
 675                 case IP_UNBLOCK_SOURCE:
 676                 case IP_ADD_SOURCE_MEMBERSHIP:
 677                 case IP_DROP_SOURCE_MEMBERSHIP:
 678                 {
 679                         struct ip_mreq_source mreqs;
 680                         int omode, add;
 681
 682                         if (optlen != sizeof(struct ip_mreq_source))
 683                                 goto e_inval;
 684                         if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
 685                                 err = -EFAULT;
 686                                 break;
 687                         }
 688                         if (optname == IP_BLOCK_SOURCE) {
 689                                 omode = MCAST_EXCLUDE;
 690                                 add = 1;
 691                         } else if (optname == IP_UNBLOCK_SOURCE) {
 692                                 omode = MCAST_EXCLUDE;
 693                                 add = 0;
 694                         } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
 695                                 struct ip_mreqn mreq;
 696
 697                                 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
 698                                 mreq.imr_address.s_addr = mreqs.imr_interface;
 699                                 mreq.imr_ifindex = 0;
 700                                 err = ip_mc_join_group(sk, &mreq);
 701                                 if (err && err != -EADDRINUSE)
 702                                         break;
 703                                 omode = MCAST_INCLUDE;
 704                                 add = 1;
 705                         } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
 706                                 omode = MCAST_INCLUDE;
 707                                 add = 0;
 708                         }
 709                         err = ip_mc_source(add, omode, sk, &mreqs, 0);
 710                         break;
 711                 }
 712                 case MCAST_JOIN_GROUP:
 713                 case MCAST_LEAVE_GROUP:
 714                 {
 715                         struct group_req greq;
 716                         struct sockaddr_in *psin;
 717                         struct ip_mreqn mreq;
 718
 719                         if (optlen < sizeof(struct group_req))
 720                                 goto e_inval;
 721                         err = -EFAULT;
 722                         if(copy_from_user(&greq, optval, sizeof(greq)))
 723                                 break;
 724                         psin = (struct sockaddr_in *)&greq.gr_group;
 725                         if (psin->sin_family != AF_INET)
 726                                 goto e_inval;
 727                         memset(&mreq, 0, sizeof(mreq));
 728                         mreq.imr_multiaddr = psin->sin_addr;
 729                         mreq.imr_ifindex = greq.gr_interface;
 730
 731                         if (optname == MCAST_JOIN_GROUP)
 732                                 err = ip_mc_join_group(sk, &mreq);
 733                         else
 734                                 err = ip_mc_leave_group(sk, &mreq);
 735                         break;
 736                 }
 737                 case MCAST_JOIN_SOURCE_GROUP:
 738                 case MCAST_LEAVE_SOURCE_GROUP:
 739                 case MCAST_BLOCK_SOURCE:
 740                 case MCAST_UNBLOCK_SOURCE:
 741                 {
 742                         struct group_source_req greqs;
 743                         struct ip_mreq_source mreqs;
 744                         struct sockaddr_in *psin;
 745                         int omode, add;
 746
 747                         if (optlen != sizeof(struct group_source_req))
 748                                 goto e_inval;
 749                         if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 750                                 err = -EFAULT;
 751                                 break;
 752                         }
 753                         if (greqs.gsr_group.ss_family != AF_INET ||
 754                             greqs.gsr_source.ss_family != AF_INET) {
 755                                 err = -EADDRNOTAVAIL;
 756                                 break;
 757                         }
 758                         psin = (struct sockaddr_in *)&greqs.gsr_group;
 759                         mreqs.imr_multiaddr = psin->sin_addr.s_addr;
 760                         psin = (struct sockaddr_in *)&greqs.gsr_source;
 761                         mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
 762                         mreqs.imr_interface = 0; /* use index for mc_source */
 763
 764                         if (optname == MCAST_BLOCK_SOURCE) {
 765                                 omode = MCAST_EXCLUDE;
 766                                 add = 1;
 767                         } else if (optname == MCAST_UNBLOCK_SOURCE) {
 768                                 omode = MCAST_EXCLUDE;
 769                                 add = 0;
 770                         } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 771                                 struct ip_mreqn mreq;
 772
 773                                 psin = (struct sockaddr_in *)&greqs.gsr_group;
 774                                 mreq.imr_multiaddr = psin->sin_addr;
 775                                 mreq.imr_address.s_addr = 0;
 776                                 mreq.imr_ifindex = greqs.gsr_interface;
 777                                 err = ip_mc_join_group(sk, &mreq);
 778                                 if (err && err != -EADDRINUSE)
 779                                         break;
 780                                 greqs.gsr_interface = mreq.imr_ifindex;
 781                                 omode = MCAST_INCLUDE;
 782                                 add = 1;
 783                         } else /* MCAST_LEAVE_SOURCE_GROUP */ {
 784                                 omode = MCAST_INCLUDE;
 785                                 add = 0;
 786                         }
 787                         err = ip_mc_source(add, omode, sk, &mreqs,
 788                                 greqs.gsr_interface);
 789                         break;
 790                 }
 791                 case MCAST_MSFILTER:
 792                 {
 793                         extern int sysctl_igmp_max_msf;
 794                         struct sockaddr_in *psin;
 795                         struct ip_msfilter *msf = NULL;
 796                         struct group_filter *gsf = NULL;
 797                         int msize, i, ifindex;
 798
 799                         if (optlen < GROUP_FILTER_SIZE(0))
 800                                 goto e_inval;
 801                         if (optlen > sysctl_optmem_max) {
 802                                 err = -ENOBUFS;
 803                                 break;
 804                         }
 805                         gsf = kmalloc(optlen,GFP_KERNEL);
 806                         if (gsf == 0) {
 807                                 err = -ENOBUFS;
 808                                 break;
 809                         }
 810                         err = -EFAULT;
 811                         if (copy_from_user(gsf, optval, optlen)) {
 812                                 goto mc_msf_out;
 813                         }
 814                         /* numsrc >= (4G-140)/128 overflow in 32 bits */
 815                         if (gsf->gf_numsrc >= 0x1ffffff ||
 816                             gsf->gf_numsrc > sysctl_igmp_max_msf) {
 817                                 err = -ENOBUFS;
 818                                 goto mc_msf_out;
 819                         }
 820                         if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 821                                 err = -EINVAL;
 822                                 goto mc_msf_out;
 823                         }
 824                         msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
 825                         msf = kmalloc(msize,GFP_KERNEL);
 826                         if (msf == 0) {
 827                                 err = -ENOBUFS;
 828                                 goto mc_msf_out;
 829                         }
 830                         ifindex = gsf->gf_interface;
 831                         psin = (struct sockaddr_in *)&gsf->gf_group;
 832                         if (psin->sin_family != AF_INET) {
 833                                 err = -EADDRNOTAVAIL;
 834                                 goto mc_msf_out;
 835                         }
 836                         msf->imsf_multiaddr = psin->sin_addr.s_addr;
 837                         msf->imsf_interface = 0;
 838                         msf->imsf_fmode = gsf->gf_fmode;
 839                         msf->imsf_numsrc = gsf->gf_numsrc;
 840                         err = -EADDRNOTAVAIL;
 841                         for (i=0; i<gsf->gf_numsrc; ++i) {
 842                                 psin = (struct sockaddr_in *)&gsf->gf_slist[i];
 843
 844                                 if (psin->sin_family != AF_INET)
 845                                         goto mc_msf_out;
 846                                 msf->imsf_slist[i] = psin->sin_addr.s_addr;
 847                         }
 848                         kfree(gsf);
 849                         gsf = NULL;
 850
 851                         err = ip_mc_msfilter(sk, msf, ifindex);
 852 mc_msf_out:
 853                         kfree(msf);
 854                         kfree(gsf);
 855                         break;
 856                 }
 857                 case IP_ROUTER_ALERT:
 858                         err = ip_ra_control(sk, val ? 1 : 0, NULL);
 859                         break;
 860
 861                 case IP_FREEBIND:
 862                         if (optlen<1)
 863                                 goto e_inval;
 864                         inet->freebind = !!val;
 865                         break;
 866
 867                 case IP_IPSEC_POLICY:
 868                 case IP_XFRM_POLICY:
 869                         err = -EPERM;
 870                         if (!capable(CAP_NET_ADMIN))
 871                                 break;
 872                         err = xfrm_user_policy(sk, optname, optval, optlen);
 873                         break;
 874
 875                 default:
 876                         err = -ENOPROTOOPT;
 877                         break;
 878         }
 879         release_sock(sk);
 880         return err;
 881
 882 e_inval:
 883         release_sock(sk);
 884         return -EINVAL;
 885 }
 886
 887 int ip_setsockopt(struct sock *sk, int level,
 888                 int optname, char __user *optval, int optlen)
 889 {
 890         int err;
 891
 892         if (level != SOL_IP)
 893                 return -ENOPROTOOPT;
 894
 895         err = do_ip_setsockopt(sk, level, optname, optval, optlen);
 896 #ifdef CONFIG_NETFILTER
 897         /* we need to exclude all possible ENOPROTOOPTs except default case */
 898         if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
 899                 optname != IP_IPSEC_POLICY && optname != IP_XFRM_POLICY
 900 #ifdef CONFIG_IP_MROUTE
 901                 && (optname < MRT_BASE || optname > (MRT_BASE + 10))
 902 #endif
 903            ) {
 904                 lock_sock(sk);
 905                 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
 906                 release_sock(sk);
 907         }
 908 #endif
 909         return err;
 910 }
 911
 912 #ifdef CONFIG_COMPAT
 913 int compat_ip_setsockopt(struct sock *sk, int level, int optname,
 914                          char __user *optval, int optlen)
 915 {
 916         int err;
 917
 918         if (level != SOL_IP)
 919                 return -ENOPROTOOPT;
 920
 921         err = do_ip_setsockopt(sk, level, optname, optval, optlen);
 922 #ifdef CONFIG_NETFILTER
 923         /* we need to exclude all possible ENOPROTOOPTs except default case */
 924         if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
 925             optname != IP_IPSEC_POLICY && optname != IP_XFRM_POLICY
 926 #ifdef CONFIG_IP_MROUTE
 927             && (optname < MRT_BASE || optname > (MRT_BASE + 10))
 928 #endif
 929            ) {
 930                 lock_sock(sk);
 931                 err = compat_nf_setsockopt(sk, PF_INET, optname,
 932                                            optval, optlen);
 933                 release_sock(sk);
 934         }
 935 #endif
 936         return err;
 937 }
 938
 939 EXPORT_SYMBOL(compat_ip_setsockopt);
 940 #endif
 941
 942 /*
 943  *      Get the options. Note for future reference. The GET of IP options gets the
 944  *      _received_ ones. The set sets the _sent_ ones.
 945  */
 946
 947 static int do_ip_getsockopt(struct sock *sk, int level, int optname,
 948                 char __user *optval, int __user *optlen)
 949 {
 950         struct inet_sock *inet = inet_sk(sk);
 951         int val;
 952         int len;
 953
 954         if(level!=SOL_IP)
 955                 return -EOPNOTSUPP;
 956
 957 #ifdef CONFIG_IP_MROUTE
 958         if(optname>=MRT_BASE && optname <=MRT_BASE+10)
 959         {
 960                 return ip_mroute_getsockopt(sk,optname,optval,optlen);
 961         }
 962 #endif
 963
 964         if(get_user(len,optlen))
 965                 return -EFAULT;
 966         if(len < 0)
 967                 return -EINVAL;
 968
 969         lock_sock(sk);
 970
 971         switch(optname) {
 972                 case IP_OPTIONS:
 973                         {
 974                                 unsigned char optbuf[sizeof(struct ip_options)+40];
 975                                 struct ip_options * opt = (struct ip_options*)optbuf;
 976                                 opt->optlen = 0;
 977                                 if (inet->opt)
 978                                         memcpy(optbuf, inet->opt,
 979                                                sizeof(struct ip_options)+
 980                                                inet->opt->optlen);
 981                                 release_sock(sk);
 982
 983                                 if (opt->optlen == 0)
 984                                         return put_user(0, optlen);
 985
 986                                 ip_options_undo(opt);
 987
 988                                 len = min_t(unsigned int, len, opt->optlen);
 989                                 if(put_user(len, optlen))
 990                                         return -EFAULT;
 991                                 if(copy_to_user(optval, opt->__data, len))
 992                                         return -EFAULT;
 993                                 return 0;
 994                         }
 995                 case IP_PKTINFO:
 996                         val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
 997                         break;
 998                 case IP_RECVTTL:
 999                         val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
1000                         break;
1001                 case IP_RECVTOS:
1002                         val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
1003                         break;
1004                 case IP_RECVOPTS:
1005                         val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
1006                         break;
1007                 case IP_RETOPTS:
1008                         val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
1009                         break;
1010                 case IP_PASSSEC:
1011                         val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
1012                         break;
1013                 case IP_TOS:
1014                         val = inet->tos;
1015                         break;
1016                 case IP_TTL:
1017                         val = (inet->uc_ttl == -1 ?
1018                                sysctl_ip_default_ttl :
1019                                inet->uc_ttl);
1020                         break;
1021                 case IP_HDRINCL:
1022                         val = inet->hdrincl;
1023                         break;
1024                 case IP_MTU_DISCOVER:
1025                         val = inet->pmtudisc;
1026                         break;
1027                 case IP_MTU:
1028                 {
1029                         struct dst_entry *dst;
1030                         val = 0;
1031                         dst = sk_dst_get(sk);
1032                         if (dst) {
1033                                 val = dst_mtu(dst);
1034                                 dst_release(dst);
1035                         }
1036                         if (!val) {
1037                                 release_sock(sk);
1038                                 return -ENOTCONN;
1039                         }
1040                         break;
1041                 }
1042                 case IP_RECVERR:
1043                         val = inet->recverr;
1044                         break;
1045                 case IP_MULTICAST_TTL:
1046                         val = inet->mc_ttl;
1047                         break;
1048                 case IP_MULTICAST_LOOP:
1049                         val = inet->mc_loop;
1050                         break;
1051                 case IP_MULTICAST_IF:
1052                 {
1053                         struct in_addr addr;
1054                         len = min_t(unsigned int, len, sizeof(struct in_addr));
1055                         addr.s_addr = inet->mc_addr;
1056                         release_sock(sk);
1057
1058                         if(put_user(len, optlen))
1059                                 return -EFAULT;
1060                         if(copy_to_user(optval, &addr, len))
1061                                 return -EFAULT;
1062                         return 0;
1063                 }
1064                 case IP_MSFILTER:
1065                 {
1066                         struct ip_msfilter msf;
1067                         int err;
1068
1069                         if (len < IP_MSFILTER_SIZE(0)) {
1070                                 release_sock(sk);
1071                                 return -EINVAL;
1072                         }
1073                         if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
1074                                 release_sock(sk);
1075                                 return -EFAULT;
1076                         }
1077                         err = ip_mc_msfget(sk, &msf,
1078                                 (struct ip_msfilter __user *)optval, optlen);
1079                         release_sock(sk);
1080                         return err;
1081                 }
1082                 case MCAST_MSFILTER:
1083                 {
1084                         struct group_filter gsf;
1085                         int err;
1086
1087                         if (len < GROUP_FILTER_SIZE(0)) {
1088                                 release_sock(sk);
1089                                 return -EINVAL;
1090                         }
1091                         if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
1092                                 release_sock(sk);
1093                                 return -EFAULT;
1094                         }
1095                         err = ip_mc_gsfget(sk, &gsf,
1096                                 (struct group_filter __user *)optval, optlen);
1097                         release_sock(sk);
1098                         return err;
1099                 }
1100                 case IP_PKTOPTIONS:
1101                 {
1102                         struct msghdr msg;
1103
1104                         release_sock(sk);
1105
1106                         if (sk->sk_type != SOCK_STREAM)
1107                                 return -ENOPROTOOPT;
1108
1109                         msg.msg_control = optval;
1110                         msg.msg_controllen = len;
1111                         msg.msg_flags = 0;
1112
1113                         if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
1114                                 struct in_pktinfo info;
1115
1116                                 info.ipi_addr.s_addr = inet->rcv_saddr;
1117                                 info.ipi_spec_dst.s_addr = inet->rcv_saddr;
1118                                 info.ipi_ifindex = inet->mc_index;
1119                                 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
1120                         }
1121                         if (inet->cmsg_flags & IP_CMSG_TTL) {
1122                                 int hlim = inet->mc_ttl;
1123                                 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
1124                         }
1125                         len -= msg.msg_controllen;
1126                         return put_user(len, optlen);
1127                 }
1128                 case IP_FREEBIND:
1129                         val = inet->freebind;
1130                         break;
1131                 default:
1132                         release_sock(sk);
1133                         return -ENOPROTOOPT;
1134         }
1135         release_sock(sk);
1136
1137         if (len < sizeof(int) && len > 0 && val>=0 && val<255) {
1138                 unsigned char ucval = (unsigned char)val;
1139                 len = 1;
1140                 if(put_user(len, optlen))
1141                         return -EFAULT;
1142                 if(copy_to_user(optval,&ucval,1))
1143                         return -EFAULT;
1144         } else {
1145                 len = min_t(unsigned int, sizeof(int), len);
1146                 if(put_user(len, optlen))
1147                         return -EFAULT;
1148                 if(copy_to_user(optval,&val,len))
1149                         return -EFAULT;
1150         }
1151         return 0;
1152 }
1153
1154 int ip_getsockopt(struct sock *sk, int level,
1155                 int optname, char __user *optval, int __user *optlen)
1156 {
1157         int err;
1158
1159         err = do_ip_getsockopt(sk, level, optname, optval, optlen);
1160 #ifdef CONFIG_NETFILTER
1161         /* we need to exclude all possible ENOPROTOOPTs except default case */
1162         if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS
1163 #ifdef CONFIG_IP_MROUTE
1164                 && (optname < MRT_BASE || optname > MRT_BASE+10)
1165 #endif
1166            ) {
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 #ifdef CONFIG_IP_MROUTE
1193             && (optname < MRT_BASE || optname > MRT_BASE+10)
1194 #endif
1195            ) {
1196                 int len;
1197
1198                 if (get_user(len, optlen))
1199                         return -EFAULT;
1200
1201                 lock_sock(sk);
1202                 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
1203                 release_sock(sk);
1204                 if (err >= 0)
1205                         err = put_user(len, optlen);
1206                 return err;
1207         }
1208 #endif
1209         return err;
1210 }
1211
1212 EXPORT_SYMBOL(compat_ip_getsockopt);
1213 #endif
1214
1215 EXPORT_SYMBOL(ip_cmsg_recv);
1216
1217 EXPORT_SYMBOL(ip_getsockopt);
1218 EXPORT_SYMBOL(ip_setsockopt);