net/ipv4/ip_sockglue.c

   1 /*
   2  * INET         An implementation of the TCP/IP protocol suite for the LINUX
   3  *              operating system.  INET is implemented using the  BSD Socket
   4  *              interface as the means of communication with the user level.
   5  *
   6  *              The IP to API glue.
   7  *
   8  * Version:     $Id: ip_sockglue.c,v 1.62 2002/02/01 22:01:04 davem Exp $
   9  *
  10  * Authors:     see ip.c
  11  *
  12  * Fixes:
  13  *              Many            :       Split from ip.c , see ip.c for history.
  14  *              Martin Mares    :       TOS setting fixed.
  15  *              Alan Cox        :       Fixed a couple of oopses in Martin's
  16  *                                      TOS tweaks.
  17  *              Mike McLagan    :       Routing by source
  18  */
  19
  20 #include <linux/module.h>
  21 #include <linux/types.h>
  22 #include <linux/mm.h>
  23 #include <linux/skbuff.h>
  24 #include <linux/ip.h>
  25 #include <linux/icmp.h>
  26 #include <linux/inetdevice.h>
  27 #include <linux/netdevice.h>
  28 #include <net/sock.h>
  29 #include <net/ip.h>
  30 #include <net/icmp.h>
  31 #include <net/tcp_states.h>
  32 #include <linux/udp.h>
  33 #include <linux/igmp.h>
  34 #include <linux/netfilter.h>
  35 #include <linux/route.h>
  36 #include <linux/mroute.h>
  37 #include <net/route.h>
  38 #include <net/xfrm.h>
  39 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
  40 #include <net/transp_v6.h>
  41 #endif
  42
  43 #include <linux/errqueue.h>
  44 #include <asm/uaccess.h>
  45
  46 #define IP_CMSG_PKTINFO         1
  47 #define IP_CMSG_TTL             2
  48 #define IP_CMSG_TOS             4
  49 #define IP_CMSG_RECVOPTS        8
  50 #define IP_CMSG_RETOPTS         16
  51 #define IP_CMSG_PASSSEC         32
  52
  53 /*
  54  *      SOL_IP control messages.
  55  */
  56
  57 static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb)
  58 {
  59         struct in_pktinfo info;
  60         struct rtable *rt = (struct rtable *)skb->dst;
  61
  62         info.ipi_addr.s_addr = skb->nh.iph->daddr;
  63         if (rt) {
  64                 info.ipi_ifindex = rt->rt_iif;
  65                 info.ipi_spec_dst.s_addr = rt->rt_spec_dst;
  66         } else {
  67                 info.ipi_ifindex = 0;
  68                 info.ipi_spec_dst.s_addr = 0;
  69         }
  70
  71         put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
  72 }
  73
  74 static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb)
  75 {
  76         int ttl = skb->nh.iph->ttl;
  77         put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl);
  78 }
  79
  80 static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb)
  81 {
  82         put_cmsg(msg, SOL_IP, IP_TOS, 1, &skb->nh.iph->tos);
  83 }
  84
  85 static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb)
  86 {
  87         if (IPCB(skb)->opt.optlen == 0)
  88                 return;
  89
  90         put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen, skb->nh.iph+1);
  91 }
  92
  93
  94 static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb)
  95 {
  96         unsigned char optbuf[sizeof(struct ip_options) + 40];
  97         struct ip_options * opt = (struct ip_options*)optbuf;
  98
  99         if (IPCB(skb)->opt.optlen == 0)
 100                 return;
 101
 102         if (ip_options_echo(opt, skb)) {
 103                 msg->msg_flags |= MSG_CTRUNC;
 104                 return;
 105         }
 106         ip_options_undo(opt);
 107
 108         put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data);
 109 }
 110
 111 static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
 112 {
 113         char *secdata;
 114         u32 seclen, secid;
 115         int err;
 116
 117         err = security_socket_getpeersec_dgram(NULL, skb, &secid);
 118         if (err)
 119                 return;
 120
 121         err = security_secid_to_secctx(secid, &secdata, &seclen);
 122         if (err)
 123                 return;
 124
 125         put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata);
 126         security_release_secctx(secdata, seclen);
 127 }
 128
 129
 130 void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
 131 {
 132         struct inet_sock *inet = inet_sk(skb->sk);
 133         unsigned flags = inet->cmsg_flags;
 134
 135         /* Ordered by supposed usage frequency */
 136         if (flags & 1)
 137                 ip_cmsg_recv_pktinfo(msg, skb);
 138         if ((flags>>=1) == 0)
 139                 return;
 140
 141         if (flags & 1)
 142                 ip_cmsg_recv_ttl(msg, skb);
 143         if ((flags>>=1) == 0)
 144                 return;
 145
 146         if (flags & 1)
 147                 ip_cmsg_recv_tos(msg, skb);
 148         if ((flags>>=1) == 0)
 149                 return;
 150
 151         if (flags & 1)
 152                 ip_cmsg_recv_opts(msg, skb);
 153         if ((flags>>=1) == 0)
 154                 return;
 155
 156         if (flags & 1)
 157                 ip_cmsg_recv_retopts(msg, skb);
 158         if ((flags>>=1) == 0)
 159                 return;
 160
 161         if (flags & 1)
 162                 ip_cmsg_recv_security(msg, skb);
 163 }
 164
 165 int ip_cmsg_send(struct msghdr *msg, struct ipcm_cookie *ipc)
 166 {
 167         int err;
 168         struct cmsghdr *cmsg;
 169
 170         for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
 171                 if (!CMSG_OK(msg, cmsg))
 172                         return -EINVAL;
 173                 if (cmsg->cmsg_level != SOL_IP)
 174                         continue;
 175                 switch (cmsg->cmsg_type) {
 176                 case IP_RETOPTS:
 177                         err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
 178                         err = ip_options_get(&ipc->opt, CMSG_DATA(cmsg), err < 40 ? err : 40);
 179                         if (err)
 180                                 return err;
 181                         break;
 182                 case IP_PKTINFO:
 183                 {
 184                         struct in_pktinfo *info;
 185                         if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
 186                                 return -EINVAL;
 187                         info = (struct in_pktinfo *)CMSG_DATA(cmsg);
 188                         ipc->oif = info->ipi_ifindex;
 189                         ipc->addr = info->ipi_spec_dst.s_addr;
 190                         break;
 191                 }
 192                 default:
 193                         return -EINVAL;
 194                 }
 195         }
 196         return 0;
 197 }
 198
 199
 200 /* Special input handler for packets caught by router alert option.
 201    They are selected only by protocol field, and then processed likely
 202    local ones; but only if someone wants them! Otherwise, router
 203    not running rsvpd will kill RSVP.
 204
 205    It is user level problem, what it will make with them.
 206    I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
 207    but receiver should be enough clever f.e. to forward mtrace requests,
 208    sent to multicast group to reach destination designated router.
 209  */
 210 struct ip_ra_chain *ip_ra_chain;
 211 DEFINE_RWLOCK(ip_ra_lock);
 212
 213 int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *))
 214 {
 215         struct ip_ra_chain *ra, *new_ra, **rap;
 216
 217         if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num == IPPROTO_RAW)
 218                 return -EINVAL;
 219
 220         new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
 221
 222         write_lock_bh(&ip_ra_lock);
 223         for (rap = &ip_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
 224                 if (ra->sk == sk) {
 225                         if (on) {
 226                                 write_unlock_bh(&ip_ra_lock);
 227                                 kfree(new_ra);
 228                                 return -EADDRINUSE;
 229                         }
 230                         *rap = ra->next;
 231                         write_unlock_bh(&ip_ra_lock);
 232
 233                         if (ra->destructor)
 234                                 ra->destructor(sk);
 235                         sock_put(sk);
 236                         kfree(ra);
 237                         return 0;
 238                 }
 239         }
 240         if (new_ra == NULL) {
 241                 write_unlock_bh(&ip_ra_lock);
 242                 return -ENOBUFS;
 243         }
 244         new_ra->sk = sk;
 245         new_ra->destructor = destructor;
 246
 247         new_ra->next = ra;
 248         *rap = new_ra;
 249         sock_hold(sk);
 250         write_unlock_bh(&ip_ra_lock);
 251
 252         return 0;
 253 }
 254
 255 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
 256                    __be16 port, u32 info, u8 *payload)
 257 {
 258         struct inet_sock *inet = inet_sk(sk);
 259         struct sock_exterr_skb *serr;
 260
 261         if (!inet->recverr)
 262                 return;
 263
 264         skb = skb_clone(skb, GFP_ATOMIC);
 265         if (!skb)
 266                 return;
 267
 268         serr = SKB_EXT_ERR(skb);
 269         serr->ee.ee_errno = err;
 270         serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
 271         serr->ee.ee_type = skb->h.icmph->type;
 272         serr->ee.ee_code = skb->h.icmph->code;
 273         serr->ee.ee_pad = 0;
 274         serr->ee.ee_info = info;
 275         serr->ee.ee_data = 0;
 276         serr->addr_offset = (u8*)&(((struct iphdr*)(skb->h.icmph+1))->daddr) - skb->nh.raw;
 277         serr->port = port;
 278
 279         skb->h.raw = payload;
 280         if (!skb_pull(skb, payload - skb->data) ||
 281             sock_queue_err_skb(sk, skb))
 282                 kfree_skb(skb);
 283 }
 284
 285 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info)
 286 {
 287         struct inet_sock *inet = inet_sk(sk);
 288         struct sock_exterr_skb *serr;
 289         struct iphdr *iph;
 290         struct sk_buff *skb;
 291
 292         if (!inet->recverr)
 293                 return;
 294
 295         skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
 296         if (!skb)
 297                 return;
 298
 299         iph = (struct iphdr*)skb_put(skb, sizeof(struct iphdr));
 300         skb->nh.iph = iph;
 301         iph->daddr = daddr;
 302
 303         serr = SKB_EXT_ERR(skb);
 304         serr->ee.ee_errno = err;
 305         serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
 306         serr->ee.ee_type = 0;
 307         serr->ee.ee_code = 0;
 308         serr->ee.ee_pad = 0;
 309         serr->ee.ee_info = info;
 310         serr->ee.ee_data = 0;
 311         serr->addr_offset = (u8*)&iph->daddr - skb->nh.raw;
 312         serr->port = port;
 313
 314         skb->h.raw = skb->tail;
 315         __skb_pull(skb, skb->tail - skb->data);
 316
 317         if (sock_queue_err_skb(sk, skb))
 318                 kfree_skb(skb);
 319 }
 320
 321 /*
 322  *      Handle MSG_ERRQUEUE
 323  */
 324 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len)
 325 {
 326         struct sock_exterr_skb *serr;
 327         struct sk_buff *skb, *skb2;
 328         struct sockaddr_in *sin;
 329         struct {
 330                 struct sock_extended_err ee;
 331                 struct sockaddr_in       offender;
 332         } errhdr;
 333         int err;
 334         int copied;
 335
 336         err = -EAGAIN;
 337         skb = skb_dequeue(&sk->sk_error_queue);
 338         if (skb == NULL)
 339                 goto out;
 340
 341         copied = skb->len;
 342         if (copied > len) {
 343                 msg->msg_flags |= MSG_TRUNC;
 344                 copied = len;
 345         }
 346         err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
 347         if (err)
 348                 goto out_free_skb;
 349
 350         sock_recv_timestamp(msg, sk, skb);
 351
 352         serr = SKB_EXT_ERR(skb);
 353
 354         sin = (struct sockaddr_in *)msg->msg_name;
 355         if (sin) {
 356                 sin->sin_family = AF_INET;
 357                 sin->sin_addr.s_addr = *(__be32*)(skb->nh.raw + serr->addr_offset);
 358                 sin->sin_port = serr->port;
 359                 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
 360         }
 361
 362         memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
 363         sin = &errhdr.offender;
 364         sin->sin_family = AF_UNSPEC;
 365         if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) {
 366                 struct inet_sock *inet = inet_sk(sk);
 367
 368                 sin->sin_family = AF_INET;
 369                 sin->sin_addr.s_addr = skb->nh.iph->saddr;
 370                 sin->sin_port = 0;
 371                 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
 372                 if (inet->cmsg_flags)
 373                         ip_cmsg_recv(msg, skb);
 374         }
 375
 376         put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
 377
 378         /* Now we could try to dump offended packet options */
 379
 380         msg->msg_flags |= MSG_ERRQUEUE;
 381         err = copied;
 382
 383         /* Reset and regenerate socket error */
 384         spin_lock_bh(&sk->sk_error_queue.lock);
 385         sk->sk_err = 0;
 386         if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
 387                 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
 388                 spin_unlock_bh(&sk->sk_error_queue.lock);
 389                 sk->sk_error_report(sk);
 390         } else
 391                 spin_unlock_bh(&sk->sk_error_queue.lock);
 392
 393 out_free_skb:
 394         kfree_skb(skb);
 395 out:
 396         return err;
 397 }
 398
 399
 400 /*
 401  *      Socket option code for IP. This is the end of the line after any TCP,UDP etc options on
 402  *      an IP socket.
 403  */
 404
 405 static int do_ip_setsockopt(struct sock *sk, int level,
 406                 int optname, char __user *optval, int optlen)
 407 {
 408         struct inet_sock *inet = inet_sk(sk);
 409         int val=0,err;
 410
 411         if (((1<<optname) & ((1<<IP_PKTINFO) | (1<<IP_RECVTTL) |
 412                             (1<<IP_RECVOPTS) | (1<<IP_RECVTOS) |
 413                             (1<<IP_RETOPTS) | (1<<IP_TOS) |
 414                             (1<<IP_TTL) | (1<<IP_HDRINCL) |
 415                             (1<<IP_MTU_DISCOVER) | (1<<IP_RECVERR) |
 416                             (1<<IP_ROUTER_ALERT) | (1<<IP_FREEBIND) |
 417                             (1<<IP_PASSSEC))) ||
 418                                 optname == IP_MULTICAST_TTL ||
 419                                 optname == IP_MULTICAST_LOOP) {
 420                 if (optlen >= sizeof(int)) {
 421                         if (get_user(val, (int __user *) optval))
 422                                 return -EFAULT;
 423                 } else if (optlen >= sizeof(char)) {
 424                         unsigned char ucval;
 425
 426                         if (get_user(ucval, (unsigned char __user *) optval))
 427                                 return -EFAULT;
 428                         val = (int) ucval;
 429                 }
 430         }
 431
 432         /* If optlen==0, it is equivalent to val == 0 */
 433
 434 #ifdef CONFIG_IP_MROUTE
 435         if (optname >= MRT_BASE && optname <= (MRT_BASE + 10))
 436                 return ip_mroute_setsockopt(sk,optname,optval,optlen);
 437 #endif
 438
 439         err = 0;
 440         lock_sock(sk);
 441
 442         switch (optname) {
 443                 case IP_OPTIONS:
 444                 {
 445                         struct ip_options * opt = NULL;
 446                         if (optlen > 40 || optlen < 0)
 447                                 goto e_inval;
 448                         err = ip_options_get_from_user(&opt, optval, optlen);
 449                         if (err)
 450                                 break;
 451                         if (inet->is_icsk) {
 452                                 struct inet_connection_sock *icsk = inet_csk(sk);
 453 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 454                                 if (sk->sk_family == PF_INET ||
 455                                     (!((1 << sk->sk_state) &
 456                                        (TCPF_LISTEN | TCPF_CLOSE)) &&
 457                                      inet->daddr != LOOPBACK4_IPV6)) {
 458 #endif
 459                                         if (inet->opt)
 460                                                 icsk->icsk_ext_hdr_len -= inet->opt->optlen;
 461                                         if (opt)
 462                                                 icsk->icsk_ext_hdr_len += opt->optlen;
 463                                         icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
 464 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 465                                 }
 466 #endif
 467                         }
 468                         opt = xchg(&inet->opt, opt);
 469                         kfree(opt);
 470                         break;
 471                 }
 472                 case IP_PKTINFO:
 473                         if (val)
 474                                 inet->cmsg_flags |= IP_CMSG_PKTINFO;
 475                         else
 476                                 inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
 477                         break;
 478                 case IP_RECVTTL:
 479                         if (val)
 480                                 inet->cmsg_flags |=  IP_CMSG_TTL;
 481                         else
 482                                 inet->cmsg_flags &= ~IP_CMSG_TTL;
 483                         break;
 484                 case IP_RECVTOS:
 485                         if (val)
 486                                 inet->cmsg_flags |=  IP_CMSG_TOS;
 487                         else
 488                                 inet->cmsg_flags &= ~IP_CMSG_TOS;
 489                         break;
 490                 case IP_RECVOPTS:
 491                         if (val)
 492                                 inet->cmsg_flags |=  IP_CMSG_RECVOPTS;
 493                         else
 494                                 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
 495                         break;
 496                 case IP_RETOPTS:
 497                         if (val)
 498                                 inet->cmsg_flags |= IP_CMSG_RETOPTS;
 499                         else
 500                                 inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
 501                         break;
 502                 case IP_PASSSEC:
 503                         if (val)
 504                                 inet->cmsg_flags |= IP_CMSG_PASSSEC;
 505                         else
 506                                 inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
 507                         break;
 508                 case IP_TOS:    /* This sets both TOS and Precedence */
 509                         if (sk->sk_type == SOCK_STREAM) {
 510                                 val &= ~3;
 511                                 val |= inet->tos & 3;
 512                         }
 513                         if (IPTOS_PREC(val) >= IPTOS_PREC_CRITIC_ECP &&
 514                             !capable(CAP_NET_ADMIN)) {
 515                                 err = -EPERM;
 516                                 break;
 517                         }
 518                         if (inet->tos != val) {
 519                                 inet->tos = val;
 520                                 sk->sk_priority = rt_tos2priority(val);
 521                                 sk_dst_reset(sk);
 522                         }
 523                         break;
 524                 case IP_TTL:
 525                         if (optlen<1)
 526                                 goto e_inval;
 527                         if (val != -1 && (val < 1 || val>255))
 528                                 goto e_inval;
 529                         inet->uc_ttl = val;
 530                         break;
 531                 case IP_HDRINCL:
 532                         if (sk->sk_type != SOCK_RAW) {
 533                                 err = -ENOPROTOOPT;
 534                                 break;
 535                         }
 536                         inet->hdrincl = val ? 1 : 0;
 537                         break;
 538                 case IP_MTU_DISCOVER:
 539                         if (val<0 || val>2)
 540                                 goto e_inval;
 541                         inet->pmtudisc = val;
 542                         break;
 543                 case IP_RECVERR:
 544                         inet->recverr = !!val;
 545                         if (!val)
 546                                 skb_queue_purge(&sk->sk_error_queue);
 547                         break;
 548                 case IP_MULTICAST_TTL:
 549                         if (sk->sk_type == SOCK_STREAM)
 550                                 goto e_inval;
 551                         if (optlen<1)
 552                                 goto e_inval;
 553                         if (val==-1)
 554                                 val = 1;
 555                         if (val < 0 || val > 255)
 556                                 goto e_inval;
 557                         inet->mc_ttl = val;
 558                         break;
 559                 case IP_MULTICAST_LOOP:
 560                         if (optlen<1)
 561                                 goto e_inval;
 562                         inet->mc_loop = !!val;
 563                         break;
 564                 case IP_MULTICAST_IF:
 565                 {
 566                         struct ip_mreqn mreq;
 567                         struct net_device *dev = NULL;
 568
 569                         if (sk->sk_type == SOCK_STREAM)
 570                                 goto e_inval;
 571                         /*
 572                          *      Check the arguments are allowable
 573                          */
 574
 575                         err = -EFAULT;
 576                         if (optlen >= sizeof(struct ip_mreqn)) {
 577                                 if (copy_from_user(&mreq,optval,sizeof(mreq)))
 578                                         break;
 579                         } else {
 580                                 memset(&mreq, 0, sizeof(mreq));
 581                                 if (optlen >= sizeof(struct in_addr) &&
 582                                     copy_from_user(&mreq.imr_address,optval,sizeof(struct in_addr)))
 583                                         break;
 584                         }
 585
 586                         if (!mreq.imr_ifindex) {
 587                                 if (mreq.imr_address.s_addr == INADDR_ANY) {
 588                                         inet->mc_index = 0;
 589                                         inet->mc_addr  = 0;
 590                                         err = 0;
 591                                         break;
 592                                 }
 593                                 dev = ip_dev_find(mreq.imr_address.s_addr);
 594                                 if (dev) {
 595                                         mreq.imr_ifindex = dev->ifindex;
 596                                         dev_put(dev);
 597                                 }
 598                         } else
 599                                 dev = __dev_get_by_index(mreq.imr_ifindex);
 600
 601
 602                         err = -EADDRNOTAVAIL;
 603                         if (!dev)
 604                                 break;
 605
 606                         err = -EINVAL;
 607                         if (sk->sk_bound_dev_if &&
 608                             mreq.imr_ifindex != sk->sk_bound_dev_if)
 609                                 break;
 610
 611                         inet->mc_index = mreq.imr_ifindex;
 612                         inet->mc_addr  = mreq.imr_address.s_addr;
 613                         err = 0;
 614                         break;
 615                 }
 616
 617                 case IP_ADD_MEMBERSHIP:
 618                 case IP_DROP_MEMBERSHIP:
 619                 {
 620                         struct ip_mreqn mreq;
 621
 622                         if (optlen < sizeof(struct ip_mreq))
 623                                 goto e_inval;
 624                         err = -EFAULT;
 625                         if (optlen >= sizeof(struct ip_mreqn)) {
 626                                 if(copy_from_user(&mreq,optval,sizeof(mreq)))
 627                                         break;
 628                         } else {
 629                                 memset(&mreq, 0, sizeof(mreq));
 630                                 if (copy_from_user(&mreq,optval,sizeof(struct ip_mreq)))
 631                                         break;
 632                         }
 633
 634                         if (optname == IP_ADD_MEMBERSHIP)
 635                                 err = ip_mc_join_group(sk, &mreq);
 636                         else
 637                                 err = ip_mc_leave_group(sk, &mreq);
 638                         break;
 639                 }
 640                 case IP_MSFILTER:
 641                 {
 642                         extern int sysctl_igmp_max_msf;
 643                         struct ip_msfilter *msf;
 644
 645                         if (optlen < IP_MSFILTER_SIZE(0))
 646                                 goto e_inval;
 647                         if (optlen > sysctl_optmem_max) {
 648                                 err = -ENOBUFS;
 649                                 break;
 650                         }
 651                         msf = kmalloc(optlen, GFP_KERNEL);
 652                         if (msf == 0) {
 653                                 err = -ENOBUFS;
 654                                 break;
 655                         }
 656                         err = -EFAULT;
 657                         if (copy_from_user(msf, optval, optlen)) {
 658                                 kfree(msf);
 659                                 break;
 660                         }
 661                         /* numsrc >= (1G-4) overflow in 32 bits */
 662                         if (msf->imsf_numsrc >= 0x3ffffffcU ||
 663                             msf->imsf_numsrc > sysctl_igmp_max_msf) {
 664                                 kfree(msf);
 665                                 err = -ENOBUFS;
 666                                 break;
 667                         }
 668                         if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
 669                                 kfree(msf);
 670                                 err = -EINVAL;
 671                                 break;
 672                         }
 673                         err = ip_mc_msfilter(sk, msf, 0);
 674                         kfree(msf);
 675                         break;
 676                 }
 677                 case IP_BLOCK_SOURCE:
 678                 case IP_UNBLOCK_SOURCE:
 679                 case IP_ADD_SOURCE_MEMBERSHIP:
 680                 case IP_DROP_SOURCE_MEMBERSHIP:
 681                 {
 682                         struct ip_mreq_source mreqs;
 683                         int omode, add;
 684
 685                         if (optlen != sizeof(struct ip_mreq_source))
 686                                 goto e_inval;
 687                         if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
 688                                 err = -EFAULT;
 689                                 break;
 690                         }
 691                         if (optname == IP_BLOCK_SOURCE) {
 692                                 omode = MCAST_EXCLUDE;
 693                                 add = 1;
 694                         } else if (optname == IP_UNBLOCK_SOURCE) {
 695                                 omode = MCAST_EXCLUDE;
 696                                 add = 0;
 697                         } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
 698                                 struct ip_mreqn mreq;
 699
 700                                 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
 701                                 mreq.imr_address.s_addr = mreqs.imr_interface;
 702                                 mreq.imr_ifindex = 0;
 703                                 err = ip_mc_join_group(sk, &mreq);
 704                                 if (err && err != -EADDRINUSE)
 705                                         break;
 706                                 omode = MCAST_INCLUDE;
 707                                 add = 1;
 708                         } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
 709                                 omode = MCAST_INCLUDE;
 710                                 add = 0;
 711                         }
 712                         err = ip_mc_source(add, omode, sk, &mreqs, 0);
 713                         break;
 714                 }
 715                 case MCAST_JOIN_GROUP:
 716                 case MCAST_LEAVE_GROUP:
 717                 {
 718                         struct group_req greq;
 719                         struct sockaddr_in *psin;
 720                         struct ip_mreqn mreq;
 721
 722                         if (optlen < sizeof(struct group_req))
 723                                 goto e_inval;
 724                         err = -EFAULT;
 725                         if(copy_from_user(&greq, optval, sizeof(greq)))
 726                                 break;
 727                         psin = (struct sockaddr_in *)&greq.gr_group;
 728                         if (psin->sin_family != AF_INET)
 729                                 goto e_inval;
 730                         memset(&mreq, 0, sizeof(mreq));
 731                         mreq.imr_multiaddr = psin->sin_addr;
 732                         mreq.imr_ifindex = greq.gr_interface;
 733
 734                         if (optname == MCAST_JOIN_GROUP)
 735                                 err = ip_mc_join_group(sk, &mreq);
 736                         else
 737                                 err = ip_mc_leave_group(sk, &mreq);
 738                         break;
 739                 }
 740                 case MCAST_JOIN_SOURCE_GROUP:
 741                 case MCAST_LEAVE_SOURCE_GROUP:
 742                 case MCAST_BLOCK_SOURCE:
 743                 case MCAST_UNBLOCK_SOURCE:
 744                 {
 745                         struct group_source_req greqs;
 746                         struct ip_mreq_source mreqs;
 747                         struct sockaddr_in *psin;
 748                         int omode, add;
 749
 750                         if (optlen != sizeof(struct group_source_req))
 751                                 goto e_inval;
 752                         if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 753                                 err = -EFAULT;
 754                                 break;
 755                         }
 756                         if (greqs.gsr_group.ss_family != AF_INET ||
 757                             greqs.gsr_source.ss_family != AF_INET) {
 758                                 err = -EADDRNOTAVAIL;
 759                                 break;
 760                         }
 761                         psin = (struct sockaddr_in *)&greqs.gsr_group;
 762                         mreqs.imr_multiaddr = psin->sin_addr.s_addr;
 763                         psin = (struct sockaddr_in *)&greqs.gsr_source;
 764                         mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
 765                         mreqs.imr_interface = 0; /* use index for mc_source */
 766
 767                         if (optname == MCAST_BLOCK_SOURCE) {
 768                                 omode = MCAST_EXCLUDE;
 769                                 add = 1;
 770                         } else if (optname == MCAST_UNBLOCK_SOURCE) {
 771                                 omode = MCAST_EXCLUDE;
 772                                 add = 0;
 773                         } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 774                                 struct ip_mreqn mreq;
 775
 776                                 psin = (struct sockaddr_in *)&greqs.gsr_group;
 777                                 mreq.imr_multiaddr = psin->sin_addr;
 778                                 mreq.imr_address.s_addr = 0;
 779                                 mreq.imr_ifindex = greqs.gsr_interface;
 780                                 err = ip_mc_join_group(sk, &mreq);
 781                                 if (err && err != -EADDRINUSE)
 782                                         break;
 783                                 greqs.gsr_interface = mreq.imr_ifindex;
 784                                 omode = MCAST_INCLUDE;
 785                                 add = 1;
 786                         } else /* MCAST_LEAVE_SOURCE_GROUP */ {
 787                                 omode = MCAST_INCLUDE;
 788                                 add = 0;
 789                         }
 790                         err = ip_mc_source(add, omode, sk, &mreqs,
 791                                 greqs.gsr_interface);
 792                         break;
 793                 }
 794                 case MCAST_MSFILTER:
 795                 {
 796                         extern int sysctl_igmp_max_msf;
 797                         struct sockaddr_in *psin;
 798                         struct ip_msfilter *msf = NULL;
 799                         struct group_filter *gsf = NULL;
 800                         int msize, i, ifindex;
 801
 802                         if (optlen < GROUP_FILTER_SIZE(0))
 803                                 goto e_inval;
 804                         if (optlen > sysctl_optmem_max) {
 805                                 err = -ENOBUFS;
 806                                 break;
 807                         }
 808                         gsf = kmalloc(optlen,GFP_KERNEL);
 809                         if (gsf == 0) {
 810                                 err = -ENOBUFS;
 811                                 break;
 812                         }
 813                         err = -EFAULT;
 814                         if (copy_from_user(gsf, optval, optlen)) {
 815                                 goto mc_msf_out;
 816                         }
 817                         /* numsrc >= (4G-140)/128 overflow in 32 bits */
 818                         if (gsf->gf_numsrc >= 0x1ffffff ||
 819                             gsf->gf_numsrc > sysctl_igmp_max_msf) {
 820                                 err = -ENOBUFS;
 821                                 goto mc_msf_out;
 822                         }
 823                         if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 824                                 err = -EINVAL;
 825                                 goto mc_msf_out;
 826                         }
 827                         msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
 828                         msf = kmalloc(msize,GFP_KERNEL);
 829                         if (msf == 0) {
 830                                 err = -ENOBUFS;
 831                                 goto mc_msf_out;
 832                         }
 833                         ifindex = gsf->gf_interface;
 834                         psin = (struct sockaddr_in *)&gsf->gf_group;
 835                         if (psin->sin_family != AF_INET) {
 836                                 err = -EADDRNOTAVAIL;
 837                                 goto mc_msf_out;
 838                         }
 839                         msf->imsf_multiaddr = psin->sin_addr.s_addr;
 840                         msf->imsf_interface = 0;
 841                         msf->imsf_fmode = gsf->gf_fmode;
 842                         msf->imsf_numsrc = gsf->gf_numsrc;
 843                         err = -EADDRNOTAVAIL;
 844                         for (i=0; i<gsf->gf_numsrc; ++i) {
 845                                 psin = (struct sockaddr_in *)&gsf->gf_slist[i];
 846
 847                                 if (psin->sin_family != AF_INET)
 848                                         goto mc_msf_out;
 849                                 msf->imsf_slist[i] = psin->sin_addr.s_addr;
 850                         }
 851                         kfree(gsf);
 852                         gsf = NULL;
 853
 854                         err = ip_mc_msfilter(sk, msf, ifindex);
 855 mc_msf_out:
 856                         kfree(msf);
 857                         kfree(gsf);
 858                         break;
 859                 }
 860                 case IP_ROUTER_ALERT:
 861                         err = ip_ra_control(sk, val ? 1 : 0, NULL);
 862                         break;
 863
 864                 case IP_FREEBIND:
 865                         if (optlen<1)
 866                                 goto e_inval;
 867                         inet->freebind = !!val;
 868                         break;
 869
 870                 case IP_IPSEC_POLICY:
 871                 case IP_XFRM_POLICY:
 872                         err = -EPERM;
 873                         if (!capable(CAP_NET_ADMIN))
 874                                 break;
 875                         err = xfrm_user_policy(sk, optname, optval, optlen);
 876                         break;
 877
 878                 default:
 879                         err = -ENOPROTOOPT;
 880                         break;
 881         }
 882         release_sock(sk);
 883         return err;
 884
 885 e_inval:
 886         release_sock(sk);
 887         return -EINVAL;
 888 }
 889
 890 int ip_setsockopt(struct sock *sk, int level,
 891                 int optname, char __user *optval, int optlen)
 892 {
 893         int err;
 894
 895         if (level != SOL_IP)
 896                 return -ENOPROTOOPT;
 897
 898         err = do_ip_setsockopt(sk, level, optname, optval, optlen);
 899 #ifdef CONFIG_NETFILTER
 900         /* we need to exclude all possible ENOPROTOOPTs except default case */
 901         if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
 902                 optname != IP_IPSEC_POLICY && optname != IP_XFRM_POLICY
 903 #ifdef CONFIG_IP_MROUTE
 904                 && (optname < MRT_BASE || optname > (MRT_BASE + 10))
 905 #endif
 906            ) {
 907                 lock_sock(sk);
 908                 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
 909                 release_sock(sk);
 910         }
 911 #endif
 912         return err;
 913 }
 914
 915 #ifdef CONFIG_COMPAT
 916 int compat_ip_setsockopt(struct sock *sk, int level, int optname,
 917                          char __user *optval, int optlen)
 918 {
 919         int err;
 920
 921         if (level != SOL_IP)
 922                 return -ENOPROTOOPT;
 923
 924         err = do_ip_setsockopt(sk, level, optname, optval, optlen);
 925 #ifdef CONFIG_NETFILTER
 926         /* we need to exclude all possible ENOPROTOOPTs except default case */
 927         if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
 928             optname != IP_IPSEC_POLICY && optname != IP_XFRM_POLICY
 929 #ifdef CONFIG_IP_MROUTE
 930             && (optname < MRT_BASE || optname > (MRT_BASE + 10))
 931 #endif
 932            ) {
 933                 lock_sock(sk);
 934                 err = compat_nf_setsockopt(sk, PF_INET, optname,
 935                                            optval, optlen);
 936                 release_sock(sk);
 937         }
 938 #endif
 939         return err;
 940 }
 941
 942 EXPORT_SYMBOL(compat_ip_setsockopt);
 943 #endif
 944
 945 /*
 946  *      Get the options. Note for future reference. The GET of IP options gets the
 947  *      _received_ ones. The set sets the _sent_ ones.
 948  */
 949
 950 static int do_ip_getsockopt(struct sock *sk, int level, int optname,
 951                 char __user *optval, int __user *optlen)
 952 {
 953         struct inet_sock *inet = inet_sk(sk);
 954         int val;
 955         int len;
 956
 957         if(level!=SOL_IP)
 958                 return -EOPNOTSUPP;
 959
 960 #ifdef CONFIG_IP_MROUTE
 961         if(optname>=MRT_BASE && optname <=MRT_BASE+10)
 962         {
 963                 return ip_mroute_getsockopt(sk,optname,optval,optlen);
 964         }
 965 #endif
 966
 967         if(get_user(len,optlen))
 968                 return -EFAULT;
 969         if(len < 0)
 970                 return -EINVAL;
 971
 972         lock_sock(sk);
 973
 974         switch(optname) {
 975                 case IP_OPTIONS:
 976                         {
 977                                 unsigned char optbuf[sizeof(struct ip_options)+40];
 978                                 struct ip_options * opt = (struct ip_options*)optbuf;
 979                                 opt->optlen = 0;
 980                                 if (inet->opt)
 981                                         memcpy(optbuf, inet->opt,
 982                                                sizeof(struct ip_options)+
 983                                                inet->opt->optlen);
 984                                 release_sock(sk);
 985
 986                                 if (opt->optlen == 0)
 987                                         return put_user(0, optlen);
 988
 989                                 ip_options_undo(opt);
 990
 991                                 len = min_t(unsigned int, len, opt->optlen);
 992                                 if(put_user(len, optlen))
 993                                         return -EFAULT;
 994                                 if(copy_to_user(optval, opt->__data, len))
 995                                         return -EFAULT;
 996                                 return 0;
 997                         }
 998                 case IP_PKTINFO:
 999                         val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
1000                         break;
1001                 case IP_RECVTTL:
1002                         val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
1003                         break;
1004                 case IP_RECVTOS:
1005                         val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
1006                         break;
1007                 case IP_RECVOPTS:
1008                         val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
1009                         break;
1010                 case IP_RETOPTS:
1011                         val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
1012                         break;
1013                 case IP_PASSSEC:
1014                         val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
1015                         break;
1016                 case IP_TOS:
1017                         val = inet->tos;
1018                         break;
1019                 case IP_TTL:
1020                         val = (inet->uc_ttl == -1 ?
1021                                sysctl_ip_default_ttl :
1022                                inet->uc_ttl);
1023                         break;
1024                 case IP_HDRINCL:
1025                         val = inet->hdrincl;
1026                         break;
1027                 case IP_MTU_DISCOVER:
1028                         val = inet->pmtudisc;
1029                         break;
1030                 case IP_MTU:
1031                 {
1032                         struct dst_entry *dst;
1033                         val = 0;
1034                         dst = sk_dst_get(sk);
1035                         if (dst) {
1036                                 val = dst_mtu(dst);
1037                                 dst_release(dst);
1038                         }
1039                         if (!val) {
1040                                 release_sock(sk);
1041                                 return -ENOTCONN;
1042                         }
1043                         break;
1044                 }
1045                 case IP_RECVERR:
1046                         val = inet->recverr;
1047                         break;
1048                 case IP_MULTICAST_TTL:
1049                         val = inet->mc_ttl;
1050                         break;
1051                 case IP_MULTICAST_LOOP:
1052                         val = inet->mc_loop;
1053                         break;
1054                 case IP_MULTICAST_IF:
1055                 {
1056                         struct in_addr addr;
1057                         len = min_t(unsigned int, len, sizeof(struct in_addr));
1058                         addr.s_addr = inet->mc_addr;
1059                         release_sock(sk);
1060
1061                         if(put_user(len, optlen))
1062                                 return -EFAULT;
1063                         if(copy_to_user(optval, &addr, len))
1064                                 return -EFAULT;
1065                         return 0;
1066                 }
1067                 case IP_MSFILTER:
1068                 {
1069                         struct ip_msfilter msf;
1070                         int err;
1071
1072                         if (len < IP_MSFILTER_SIZE(0)) {
1073                                 release_sock(sk);
1074                                 return -EINVAL;
1075                         }
1076                         if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
1077                                 release_sock(sk);
1078                                 return -EFAULT;
1079                         }
1080                         err = ip_mc_msfget(sk, &msf,
1081                                 (struct ip_msfilter __user *)optval, optlen);
1082                         release_sock(sk);
1083                         return err;
1084                 }
1085                 case MCAST_MSFILTER:
1086                 {
1087                         struct group_filter gsf;
1088                         int err;
1089
1090                         if (len < GROUP_FILTER_SIZE(0)) {
1091                                 release_sock(sk);
1092                                 return -EINVAL;
1093                         }
1094                         if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
1095                                 release_sock(sk);
1096                                 return -EFAULT;
1097                         }
1098                         err = ip_mc_gsfget(sk, &gsf,
1099                                 (struct group_filter __user *)optval, optlen);
1100                         release_sock(sk);
1101                         return err;
1102                 }
1103                 case IP_PKTOPTIONS:
1104                 {
1105                         struct msghdr msg;
1106
1107                         release_sock(sk);
1108
1109                         if (sk->sk_type != SOCK_STREAM)
1110                                 return -ENOPROTOOPT;
1111
1112                         msg.msg_control = optval;
1113                         msg.msg_controllen = len;
1114                         msg.msg_flags = 0;
1115
1116                         if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
1117                                 struct in_pktinfo info;
1118
1119                                 info.ipi_addr.s_addr = inet->rcv_saddr;
1120                                 info.ipi_spec_dst.s_addr = inet->rcv_saddr;
1121                                 info.ipi_ifindex = inet->mc_index;
1122                                 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
1123                         }
1124                         if (inet->cmsg_flags & IP_CMSG_TTL) {
1125                                 int hlim = inet->mc_ttl;
1126                                 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
1127                         }
1128                         len -= msg.msg_controllen;
1129                         return put_user(len, optlen);
1130                 }
1131                 case IP_FREEBIND:
1132                         val = inet->freebind;
1133                         break;
1134                 default:
1135                         release_sock(sk);
1136                         return -ENOPROTOOPT;
1137         }
1138         release_sock(sk);
1139
1140         if (len < sizeof(int) && len > 0 && val>=0 && val<255) {
1141                 unsigned char ucval = (unsigned char)val;
1142                 len = 1;
1143                 if(put_user(len, optlen))
1144                         return -EFAULT;
1145                 if(copy_to_user(optval,&ucval,1))
1146                         return -EFAULT;
1147         } else {
1148                 len = min_t(unsigned int, sizeof(int), len);
1149                 if(put_user(len, optlen))
1150                         return -EFAULT;
1151                 if(copy_to_user(optval,&val,len))
1152                         return -EFAULT;
1153         }
1154         return 0;
1155 }
1156
1157 int ip_getsockopt(struct sock *sk, int level,
1158                 int optname, char __user *optval, int __user *optlen)
1159 {
1160         int err;
1161
1162         err = do_ip_getsockopt(sk, level, optname, optval, optlen);
1163 #ifdef CONFIG_NETFILTER
1164         /* we need to exclude all possible ENOPROTOOPTs except default case */
1165         if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS
1166 #ifdef CONFIG_IP_MROUTE
1167                 && (optname < MRT_BASE || optname > MRT_BASE+10)
1168 #endif
1169            ) {
1170                 int len;
1171
1172                 if(get_user(len,optlen))
1173                         return -EFAULT;
1174
1175                 lock_sock(sk);
1176                 err = nf_getsockopt(sk, PF_INET, optname, optval,
1177                                 &len);
1178                 release_sock(sk);
1179                 if (err >= 0)
1180                         err = put_user(len, optlen);
1181                 return err;
1182         }
1183 #endif
1184         return err;
1185 }
1186
1187 #ifdef CONFIG_COMPAT
1188 int compat_ip_getsockopt(struct sock *sk, int level, int optname,
1189                          char __user *optval, int __user *optlen)
1190 {
1191         int err = do_ip_getsockopt(sk, level, optname, optval, optlen);
1192 #ifdef CONFIG_NETFILTER
1193         /* we need to exclude all possible ENOPROTOOPTs except default case */
1194         if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS
1195 #ifdef CONFIG_IP_MROUTE
1196             && (optname < MRT_BASE || optname > MRT_BASE+10)
1197 #endif
1198            ) {
1199                 int len;
1200
1201                 if (get_user(len, optlen))
1202                         return -EFAULT;
1203
1204                 lock_sock(sk);
1205                 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
1206                 release_sock(sk);
1207                 if (err >= 0)
1208                         err = put_user(len, optlen);
1209                 return err;
1210         }
1211 #endif
1212         return err;
1213 }
1214
1215 EXPORT_SYMBOL(compat_ip_getsockopt);
1216 #endif
1217
1218 EXPORT_SYMBOL(ip_cmsg_recv);
1219
1220 EXPORT_SYMBOL(ip_getsockopt);
1221 EXPORT_SYMBOL(ip_setsockopt);