git.oblomov.eu Git - linux-2.6/blob - net/ipv4/ip_sockglue.c

   1 /*
   2  * INET         An implementation of the TCP/IP protocol suite for the LINUX
   3  *              operating system.  INET is implemented using the  BSD Socket
   4  *              interface as the means of communication with the user level.
   5  *
   6  *              The IP to API glue.
   7  *
   8  * Version:     $Id: ip_sockglue.c,v 1.62 2002/02/01 22:01:04 davem Exp $
   9  *
  10  * Authors:     see ip.c
  11  *
  12  * Fixes:
  13  *              Many            :       Split from ip.c , see ip.c for history.
  14  *              Martin Mares    :       TOS setting fixed.
  15  *              Alan Cox        :       Fixed a couple of oopses in Martin's
  16  *                                      TOS tweaks.
  17  *              Mike McLagan    :       Routing by source
  18  */
  19
  20 #include <linux/module.h>
  21 #include <linux/types.h>
  22 #include <linux/mm.h>
  23 #include <linux/sched.h>
  24 #include <linux/skbuff.h>
  25 #include <linux/ip.h>
  26 #include <linux/icmp.h>
  27 #include <linux/inetdevice.h>
  28 #include <linux/netdevice.h>
  29 #include <net/sock.h>
  30 #include <net/ip.h>
  31 #include <net/icmp.h>
  32 #include <net/tcp_states.h>
  33 #include <linux/udp.h>
  34 #include <linux/igmp.h>
  35 #include <linux/netfilter.h>
  36 #include <linux/route.h>
  37 #include <linux/mroute.h>
  38 #include <net/route.h>
  39 #include <net/xfrm.h>
  40 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
  41 #include <net/transp_v6.h>
  42 #endif
  43
  44 #include <linux/errqueue.h>
  45 #include <asm/uaccess.h>
  46
  47 #define IP_CMSG_PKTINFO         1
  48 #define IP_CMSG_TTL             2
  49 #define IP_CMSG_TOS             4
  50 #define IP_CMSG_RECVOPTS        8
  51 #define IP_CMSG_RETOPTS         16
  52 #define IP_CMSG_PASSSEC         32
  53
  54 /*
  55  *      SOL_IP control messages.
  56  */
  57
  58 static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb)
  59 {
  60         struct in_pktinfo info;
  61         struct rtable *rt = (struct rtable *)skb->dst;
  62
  63         info.ipi_addr.s_addr = skb->nh.iph->daddr;
  64         if (rt) {
  65                 info.ipi_ifindex = rt->rt_iif;
  66                 info.ipi_spec_dst.s_addr = rt->rt_spec_dst;
  67         } else {
  68                 info.ipi_ifindex = 0;
  69                 info.ipi_spec_dst.s_addr = 0;
  70         }
  71
  72         put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
  73 }
  74
  75 static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb)
  76 {
  77         int ttl = skb->nh.iph->ttl;
  78         put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl);
  79 }
  80
  81 static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb)
  82 {
  83         put_cmsg(msg, SOL_IP, IP_TOS, 1, &skb->nh.iph->tos);
  84 }
  85
  86 static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb)
  87 {
  88         if (IPCB(skb)->opt.optlen == 0)
  89                 return;
  90
  91         put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen, skb->nh.iph+1);
  92 }
  93
  94
  95 static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb)
  96 {
  97         unsigned char optbuf[sizeof(struct ip_options) + 40];
  98         struct ip_options * opt = (struct ip_options*)optbuf;
  99
 100         if (IPCB(skb)->opt.optlen == 0)
 101                 return;
 102
 103         if (ip_options_echo(opt, skb)) {
 104                 msg->msg_flags |= MSG_CTRUNC;
 105                 return;
 106         }
 107         ip_options_undo(opt);
 108
 109         put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data);
 110 }
 111
 112 static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
 113 {
 114         char *secdata;
 115         u32 seclen;
 116         int err;
 117
 118         err = security_socket_getpeersec_dgram(skb, &secdata, &seclen);
 119         if (err)
 120                 return;
 121
 122         put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata);
 123 }
 124
 125
 126 void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
 127 {
 128         struct inet_sock *inet = inet_sk(skb->sk);
 129         unsigned flags = inet->cmsg_flags;
 130
 131         /* Ordered by supposed usage frequency */
 132         if (flags & 1)
 133                 ip_cmsg_recv_pktinfo(msg, skb);
 134         if ((flags>>=1) == 0)
 135                 return;
 136
 137         if (flags & 1)
 138                 ip_cmsg_recv_ttl(msg, skb);
 139         if ((flags>>=1) == 0)
 140                 return;
 141
 142         if (flags & 1)
 143                 ip_cmsg_recv_tos(msg, skb);
 144         if ((flags>>=1) == 0)
 145                 return;
 146
 147         if (flags & 1)
 148                 ip_cmsg_recv_opts(msg, skb);
 149         if ((flags>>=1) == 0)
 150                 return;
 151
 152         if (flags & 1)
 153                 ip_cmsg_recv_retopts(msg, skb);
 154         if ((flags>>=1) == 0)
 155                 return;
 156
 157         if (flags & 1)
 158                 ip_cmsg_recv_security(msg, skb);
 159 }
 160
 161 int ip_cmsg_send(struct msghdr *msg, struct ipcm_cookie *ipc)
 162 {
 163         int err;
 164         struct cmsghdr *cmsg;
 165
 166         for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
 167                 if (!CMSG_OK(msg, cmsg))
 168                         return -EINVAL;
 169                 if (cmsg->cmsg_level != SOL_IP)
 170                         continue;
 171                 switch (cmsg->cmsg_type) {
 172                 case IP_RETOPTS:
 173                         err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
 174                         err = ip_options_get(&ipc->opt, CMSG_DATA(cmsg), err < 40 ? err : 40);
 175                         if (err)
 176                                 return err;
 177                         break;
 178                 case IP_PKTINFO:
 179                 {
 180                         struct in_pktinfo *info;
 181                         if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
 182                                 return -EINVAL;
 183                         info = (struct in_pktinfo *)CMSG_DATA(cmsg);
 184                         ipc->oif = info->ipi_ifindex;
 185                         ipc->addr = info->ipi_spec_dst.s_addr;
 186                         break;
 187                 }
 188                 default:
 189                         return -EINVAL;
 190                 }
 191         }
 192         return 0;
 193 }
 194
 195
 196 /* Special input handler for packets caught by router alert option.
 197    They are selected only by protocol field, and then processed likely
 198    local ones; but only if someone wants them! Otherwise, router
 199    not running rsvpd will kill RSVP.
 200
 201    It is user level problem, what it will make with them.
 202    I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
 203    but receiver should be enough clever f.e. to forward mtrace requests,
 204    sent to multicast group to reach destination designated router.
 205  */
 206 struct ip_ra_chain *ip_ra_chain;
 207 DEFINE_RWLOCK(ip_ra_lock);
 208
 209 int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *))
 210 {
 211         struct ip_ra_chain *ra, *new_ra, **rap;
 212
 213         if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num == IPPROTO_RAW)
 214                 return -EINVAL;
 215
 216         new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
 217
 218         write_lock_bh(&ip_ra_lock);
 219         for (rap = &ip_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
 220                 if (ra->sk == sk) {
 221                         if (on) {
 222                                 write_unlock_bh(&ip_ra_lock);
 223                                 kfree(new_ra);
 224                                 return -EADDRINUSE;
 225                         }
 226                         *rap = ra->next;
 227                         write_unlock_bh(&ip_ra_lock);
 228
 229                         if (ra->destructor)
 230                                 ra->destructor(sk);
 231                         sock_put(sk);
 232                         kfree(ra);
 233                         return 0;
 234                 }
 235         }
 236         if (new_ra == NULL) {
 237                 write_unlock_bh(&ip_ra_lock);
 238                 return -ENOBUFS;
 239         }
 240         new_ra->sk = sk;
 241         new_ra->destructor = destructor;
 242
 243         new_ra->next = ra;
 244         *rap = new_ra;
 245         sock_hold(sk);
 246         write_unlock_bh(&ip_ra_lock);
 247
 248         return 0;
 249 }
 250
 251 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
 252                    u16 port, u32 info, u8 *payload)
 253 {
 254         struct inet_sock *inet = inet_sk(sk);
 255         struct sock_exterr_skb *serr;
 256
 257         if (!inet->recverr)
 258                 return;
 259
 260         skb = skb_clone(skb, GFP_ATOMIC);
 261         if (!skb)
 262                 return;
 263
 264         serr = SKB_EXT_ERR(skb);
 265         serr->ee.ee_errno = err;
 266         serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
 267         serr->ee.ee_type = skb->h.icmph->type;
 268         serr->ee.ee_code = skb->h.icmph->code;
 269         serr->ee.ee_pad = 0;
 270         serr->ee.ee_info = info;
 271         serr->ee.ee_data = 0;
 272         serr->addr_offset = (u8*)&(((struct iphdr*)(skb->h.icmph+1))->daddr) - skb->nh.raw;
 273         serr->port = port;
 274
 275         skb->h.raw = payload;
 276         if (!skb_pull(skb, payload - skb->data) ||
 277             sock_queue_err_skb(sk, skb))
 278                 kfree_skb(skb);
 279 }
 280
 281 void ip_local_error(struct sock *sk, int err, u32 daddr, u16 port, u32 info)
 282 {
 283         struct inet_sock *inet = inet_sk(sk);
 284         struct sock_exterr_skb *serr;
 285         struct iphdr *iph;
 286         struct sk_buff *skb;
 287
 288         if (!inet->recverr)
 289                 return;
 290
 291         skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
 292         if (!skb)
 293                 return;
 294
 295         iph = (struct iphdr*)skb_put(skb, sizeof(struct iphdr));
 296         skb->nh.iph = iph;
 297         iph->daddr = daddr;
 298
 299         serr = SKB_EXT_ERR(skb);
 300         serr->ee.ee_errno = err;
 301         serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
 302         serr->ee.ee_type = 0;
 303         serr->ee.ee_code = 0;
 304         serr->ee.ee_pad = 0;
 305         serr->ee.ee_info = info;
 306         serr->ee.ee_data = 0;
 307         serr->addr_offset = (u8*)&iph->daddr - skb->nh.raw;
 308         serr->port = port;
 309
 310         skb->h.raw = skb->tail;
 311         __skb_pull(skb, skb->tail - skb->data);
 312
 313         if (sock_queue_err_skb(sk, skb))
 314                 kfree_skb(skb);
 315 }
 316
 317 /*
 318  *      Handle MSG_ERRQUEUE
 319  */
 320 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len)
 321 {
 322         struct sock_exterr_skb *serr;
 323         struct sk_buff *skb, *skb2;
 324         struct sockaddr_in *sin;
 325         struct {
 326                 struct sock_extended_err ee;
 327                 struct sockaddr_in       offender;
 328         } errhdr;
 329         int err;
 330         int copied;
 331
 332         err = -EAGAIN;
 333         skb = skb_dequeue(&sk->sk_error_queue);
 334         if (skb == NULL)
 335                 goto out;
 336
 337         copied = skb->len;
 338         if (copied > len) {
 339                 msg->msg_flags |= MSG_TRUNC;
 340                 copied = len;
 341         }
 342         err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
 343         if (err)
 344                 goto out_free_skb;
 345
 346         sock_recv_timestamp(msg, sk, skb);
 347
 348         serr = SKB_EXT_ERR(skb);
 349
 350         sin = (struct sockaddr_in *)msg->msg_name;
 351         if (sin) {
 352                 sin->sin_family = AF_INET;
 353                 sin->sin_addr.s_addr = *(u32*)(skb->nh.raw + serr->addr_offset);
 354                 sin->sin_port = serr->port;
 355                 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
 356         }
 357
 358         memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
 359         sin = &errhdr.offender;
 360         sin->sin_family = AF_UNSPEC;
 361         if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) {
 362                 struct inet_sock *inet = inet_sk(sk);
 363
 364                 sin->sin_family = AF_INET;
 365                 sin->sin_addr.s_addr = skb->nh.iph->saddr;
 366                 sin->sin_port = 0;
 367                 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
 368                 if (inet->cmsg_flags)
 369                         ip_cmsg_recv(msg, skb);
 370         }
 371
 372         put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
 373
 374         /* Now we could try to dump offended packet options */
 375
 376         msg->msg_flags |= MSG_ERRQUEUE;
 377         err = copied;
 378
 379         /* Reset and regenerate socket error */
 380         spin_lock_bh(&sk->sk_error_queue.lock);
 381         sk->sk_err = 0;
 382         if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
 383                 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
 384                 spin_unlock_bh(&sk->sk_error_queue.lock);
 385                 sk->sk_error_report(sk);
 386         } else
 387                 spin_unlock_bh(&sk->sk_error_queue.lock);
 388
 389 out_free_skb:
 390         kfree_skb(skb);
 391 out:
 392         return err;
 393 }
 394
 395
 396 /*
 397  *      Socket option code for IP. This is the end of the line after any TCP,UDP etc options on
 398  *      an IP socket.
 399  */
 400
 401 static int do_ip_setsockopt(struct sock *sk, int level,
 402                 int optname, char __user *optval, int optlen)
 403 {
 404         struct inet_sock *inet = inet_sk(sk);
 405         int val=0,err;
 406
 407         if (((1<<optname) & ((1<<IP_PKTINFO) | (1<<IP_RECVTTL) |
 408                             (1<<IP_RECVOPTS) | (1<<IP_RECVTOS) |
 409                             (1<<IP_RETOPTS) | (1<<IP_TOS) |
 410                             (1<<IP_TTL) | (1<<IP_HDRINCL) |
 411                             (1<<IP_MTU_DISCOVER) | (1<<IP_RECVERR) |
 412                             (1<<IP_ROUTER_ALERT) | (1<<IP_FREEBIND) |
 413                             (1<<IP_PASSSEC))) ||
 414                                 optname == IP_MULTICAST_TTL ||
 415                                 optname == IP_MULTICAST_LOOP) {
 416                 if (optlen >= sizeof(int)) {
 417                         if (get_user(val, (int __user *) optval))
 418                                 return -EFAULT;
 419                 } else if (optlen >= sizeof(char)) {
 420                         unsigned char ucval;
 421
 422                         if (get_user(ucval, (unsigned char __user *) optval))
 423                                 return -EFAULT;
 424                         val = (int) ucval;
 425                 }
 426         }
 427
 428         /* If optlen==0, it is equivalent to val == 0 */
 429
 430 #ifdef CONFIG_IP_MROUTE
 431         if (optname >= MRT_BASE && optname <= (MRT_BASE + 10))
 432                 return ip_mroute_setsockopt(sk,optname,optval,optlen);
 433 #endif
 434
 435         err = 0;
 436         lock_sock(sk);
 437
 438         switch (optname) {
 439                 case IP_OPTIONS:
 440                 {
 441                         struct ip_options * opt = NULL;
 442                         if (optlen > 40 || optlen < 0)
 443                                 goto e_inval;
 444                         err = ip_options_get_from_user(&opt, optval, optlen);
 445                         if (err)
 446                                 break;
 447                         if (inet->is_icsk) {
 448                                 struct inet_connection_sock *icsk = inet_csk(sk);
 449 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 450                                 if (sk->sk_family == PF_INET ||
 451                                     (!((1 << sk->sk_state) &
 452                                        (TCPF_LISTEN | TCPF_CLOSE)) &&
 453                                      inet->daddr != LOOPBACK4_IPV6)) {
 454 #endif
 455                                         if (inet->opt)
 456                                                 icsk->icsk_ext_hdr_len -= inet->opt->optlen;
 457                                         if (opt)
 458                                                 icsk->icsk_ext_hdr_len += opt->optlen;
 459                                         icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
 460 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 461                                 }
 462 #endif
 463                         }
 464                         opt = xchg(&inet->opt, opt);
 465                         kfree(opt);
 466                         break;
 467                 }
 468                 case IP_PKTINFO:
 469                         if (val)
 470                                 inet->cmsg_flags |= IP_CMSG_PKTINFO;
 471                         else
 472                                 inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
 473                         break;
 474                 case IP_RECVTTL:
 475                         if (val)
 476                                 inet->cmsg_flags |=  IP_CMSG_TTL;
 477                         else
 478                                 inet->cmsg_flags &= ~IP_CMSG_TTL;
 479                         break;
 480                 case IP_RECVTOS:
 481                         if (val)
 482                                 inet->cmsg_flags |=  IP_CMSG_TOS;
 483                         else
 484                                 inet->cmsg_flags &= ~IP_CMSG_TOS;
 485                         break;
 486                 case IP_RECVOPTS:
 487                         if (val)
 488                                 inet->cmsg_flags |=  IP_CMSG_RECVOPTS;
 489                         else
 490                                 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
 491                         break;
 492                 case IP_RETOPTS:
 493                         if (val)
 494                                 inet->cmsg_flags |= IP_CMSG_RETOPTS;
 495                         else
 496                                 inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
 497                         break;
 498                 case IP_PASSSEC:
 499                         if (val)
 500                                 inet->cmsg_flags |= IP_CMSG_PASSSEC;
 501                         else
 502                                 inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
 503                         break;
 504                 case IP_TOS:    /* This sets both TOS and Precedence */
 505                         if (sk->sk_type == SOCK_STREAM) {
 506                                 val &= ~3;
 507                                 val |= inet->tos & 3;
 508                         }
 509                         if (IPTOS_PREC(val) >= IPTOS_PREC_CRITIC_ECP &&
 510                             !capable(CAP_NET_ADMIN)) {
 511                                 err = -EPERM;
 512                                 break;
 513                         }
 514                         if (inet->tos != val) {
 515                                 inet->tos = val;
 516                                 sk->sk_priority = rt_tos2priority(val);
 517                                 sk_dst_reset(sk);
 518                         }
 519                         break;
 520                 case IP_TTL:
 521                         if (optlen<1)
 522                                 goto e_inval;
 523                         if (val != -1 && (val < 1 || val>255))
 524                                 goto e_inval;
 525                         inet->uc_ttl = val;
 526                         break;
 527                 case IP_HDRINCL:
 528                         if (sk->sk_type != SOCK_RAW) {
 529                                 err = -ENOPROTOOPT;
 530                                 break;
 531                         }
 532                         inet->hdrincl = val ? 1 : 0;
 533                         break;
 534                 case IP_MTU_DISCOVER:
 535                         if (val<0 || val>2)
 536                                 goto e_inval;
 537                         inet->pmtudisc = val;
 538                         break;
 539                 case IP_RECVERR:
 540                         inet->recverr = !!val;
 541                         if (!val)
 542                                 skb_queue_purge(&sk->sk_error_queue);
 543                         break;
 544                 case IP_MULTICAST_TTL:
 545                         if (sk->sk_type == SOCK_STREAM)
 546                                 goto e_inval;
 547                         if (optlen<1)
 548                                 goto e_inval;
 549                         if (val==-1)
 550                                 val = 1;
 551                         if (val < 0 || val > 255)
 552                                 goto e_inval;
 553                         inet->mc_ttl = val;
 554                         break;
 555                 case IP_MULTICAST_LOOP:
 556                         if (optlen<1)
 557                                 goto e_inval;
 558                         inet->mc_loop = !!val;
 559                         break;
 560                 case IP_MULTICAST_IF:
 561                 {
 562                         struct ip_mreqn mreq;
 563                         struct net_device *dev = NULL;
 564
 565                         if (sk->sk_type == SOCK_STREAM)
 566                                 goto e_inval;
 567                         /*
 568                          *      Check the arguments are allowable
 569                          */
 570
 571                         err = -EFAULT;
 572                         if (optlen >= sizeof(struct ip_mreqn)) {
 573                                 if (copy_from_user(&mreq,optval,sizeof(mreq)))
 574                                         break;
 575                         } else {
 576                                 memset(&mreq, 0, sizeof(mreq));
 577                                 if (optlen >= sizeof(struct in_addr) &&
 578                                     copy_from_user(&mreq.imr_address,optval,sizeof(struct in_addr)))
 579                                         break;
 580                         }
 581
 582                         if (!mreq.imr_ifindex) {
 583                                 if (mreq.imr_address.s_addr == INADDR_ANY) {
 584                                         inet->mc_index = 0;
 585                                         inet->mc_addr  = 0;
 586                                         err = 0;
 587                                         break;
 588                                 }
 589                                 dev = ip_dev_find(mreq.imr_address.s_addr);
 590                                 if (dev) {
 591                                         mreq.imr_ifindex = dev->ifindex;
 592                                         dev_put(dev);
 593                                 }
 594                         } else
 595                                 dev = __dev_get_by_index(mreq.imr_ifindex);
 596
 597
 598                         err = -EADDRNOTAVAIL;
 599                         if (!dev)
 600                                 break;
 601
 602                         err = -EINVAL;
 603                         if (sk->sk_bound_dev_if &&
 604                             mreq.imr_ifindex != sk->sk_bound_dev_if)
 605                                 break;
 606
 607                         inet->mc_index = mreq.imr_ifindex;
 608                         inet->mc_addr  = mreq.imr_address.s_addr;
 609                         err = 0;
 610                         break;
 611                 }
 612
 613                 case IP_ADD_MEMBERSHIP:
 614                 case IP_DROP_MEMBERSHIP:
 615                 {
 616                         struct ip_mreqn mreq;
 617
 618                         if (optlen < sizeof(struct ip_mreq))
 619                                 goto e_inval;
 620                         err = -EFAULT;
 621                         if (optlen >= sizeof(struct ip_mreqn)) {
 622                                 if(copy_from_user(&mreq,optval,sizeof(mreq)))
 623                                         break;
 624                         } else {
 625                                 memset(&mreq, 0, sizeof(mreq));
 626                                 if (copy_from_user(&mreq,optval,sizeof(struct ip_mreq)))
 627                                         break;
 628                         }
 629
 630                         if (optname == IP_ADD_MEMBERSHIP)
 631                                 err = ip_mc_join_group(sk, &mreq);
 632                         else
 633                                 err = ip_mc_leave_group(sk, &mreq);
 634                         break;
 635                 }
 636                 case IP_MSFILTER:
 637                 {
 638                         extern int sysctl_igmp_max_msf;
 639                         struct ip_msfilter *msf;
 640
 641                         if (optlen < IP_MSFILTER_SIZE(0))
 642                                 goto e_inval;
 643                         if (optlen > sysctl_optmem_max) {
 644                                 err = -ENOBUFS;
 645                                 break;
 646                         }
 647                         msf = kmalloc(optlen, GFP_KERNEL);
 648                         if (msf == 0) {
 649                                 err = -ENOBUFS;
 650                                 break;
 651                         }
 652                         err = -EFAULT;
 653                         if (copy_from_user(msf, optval, optlen)) {
 654                                 kfree(msf);
 655                                 break;
 656                         }
 657                         /* numsrc >= (1G-4) overflow in 32 bits */
 658                         if (msf->imsf_numsrc >= 0x3ffffffcU ||
 659                             msf->imsf_numsrc > sysctl_igmp_max_msf) {
 660                                 kfree(msf);
 661                                 err = -ENOBUFS;
 662                                 break;
 663                         }
 664                         if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
 665                                 kfree(msf);
 666                                 err = -EINVAL;
 667                                 break;
 668                         }
 669                         err = ip_mc_msfilter(sk, msf, 0);
 670                         kfree(msf);
 671                         break;
 672                 }
 673                 case IP_BLOCK_SOURCE:
 674                 case IP_UNBLOCK_SOURCE:
 675                 case IP_ADD_SOURCE_MEMBERSHIP:
 676                 case IP_DROP_SOURCE_MEMBERSHIP:
 677                 {
 678                         struct ip_mreq_source mreqs;
 679                         int omode, add;
 680
 681                         if (optlen != sizeof(struct ip_mreq_source))
 682                                 goto e_inval;
 683                         if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
 684                                 err = -EFAULT;
 685                                 break;
 686                         }
 687                         if (optname == IP_BLOCK_SOURCE) {
 688                                 omode = MCAST_EXCLUDE;
 689                                 add = 1;
 690                         } else if (optname == IP_UNBLOCK_SOURCE) {
 691                                 omode = MCAST_EXCLUDE;
 692                                 add = 0;
 693                         } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
 694                                 struct ip_mreqn mreq;
 695
 696                                 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
 697                                 mreq.imr_address.s_addr = mreqs.imr_interface;
 698                                 mreq.imr_ifindex = 0;
 699                                 err = ip_mc_join_group(sk, &mreq);
 700                                 if (err && err != -EADDRINUSE)
 701                                         break;
 702                                 omode = MCAST_INCLUDE;
 703                                 add = 1;
 704                         } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
 705                                 omode = MCAST_INCLUDE;
 706                                 add = 0;
 707                         }
 708                         err = ip_mc_source(add, omode, sk, &mreqs, 0);
 709                         break;
 710                 }
 711                 case MCAST_JOIN_GROUP:
 712                 case MCAST_LEAVE_GROUP:
 713                 {
 714                         struct group_req greq;
 715                         struct sockaddr_in *psin;
 716                         struct ip_mreqn mreq;
 717
 718                         if (optlen < sizeof(struct group_req))
 719                                 goto e_inval;
 720                         err = -EFAULT;
 721                         if(copy_from_user(&greq, optval, sizeof(greq)))
 722                                 break;
 723                         psin = (struct sockaddr_in *)&greq.gr_group;
 724                         if (psin->sin_family != AF_INET)
 725                                 goto e_inval;
 726                         memset(&mreq, 0, sizeof(mreq));
 727                         mreq.imr_multiaddr = psin->sin_addr;
 728                         mreq.imr_ifindex = greq.gr_interface;
 729
 730                         if (optname == MCAST_JOIN_GROUP)
 731                                 err = ip_mc_join_group(sk, &mreq);
 732                         else
 733                                 err = ip_mc_leave_group(sk, &mreq);
 734                         break;
 735                 }
 736                 case MCAST_JOIN_SOURCE_GROUP:
 737                 case MCAST_LEAVE_SOURCE_GROUP:
 738                 case MCAST_BLOCK_SOURCE:
 739                 case MCAST_UNBLOCK_SOURCE:
 740                 {
 741                         struct group_source_req greqs;
 742                         struct ip_mreq_source mreqs;
 743                         struct sockaddr_in *psin;
 744                         int omode, add;
 745
 746                         if (optlen != sizeof(struct group_source_req))
 747                                 goto e_inval;
 748                         if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 749                                 err = -EFAULT;
 750                                 break;
 751                         }
 752                         if (greqs.gsr_group.ss_family != AF_INET ||
 753                             greqs.gsr_source.ss_family != AF_INET) {
 754                                 err = -EADDRNOTAVAIL;
 755                                 break;
 756                         }
 757                         psin = (struct sockaddr_in *)&greqs.gsr_group;
 758                         mreqs.imr_multiaddr = psin->sin_addr.s_addr;
 759                         psin = (struct sockaddr_in *)&greqs.gsr_source;
 760                         mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
 761                         mreqs.imr_interface = 0; /* use index for mc_source */
 762
 763                         if (optname == MCAST_BLOCK_SOURCE) {
 764                                 omode = MCAST_EXCLUDE;
 765                                 add = 1;
 766                         } else if (optname == MCAST_UNBLOCK_SOURCE) {
 767                                 omode = MCAST_EXCLUDE;
 768                                 add = 0;
 769                         } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 770                                 struct ip_mreqn mreq;
 771
 772                                 psin = (struct sockaddr_in *)&greqs.gsr_group;
 773                                 mreq.imr_multiaddr = psin->sin_addr;
 774                                 mreq.imr_address.s_addr = 0;
 775                                 mreq.imr_ifindex = greqs.gsr_interface;
 776                                 err = ip_mc_join_group(sk, &mreq);
 777                                 if (err && err != -EADDRINUSE)
 778                                         break;
 779                                 greqs.gsr_interface = mreq.imr_ifindex;
 780                                 omode = MCAST_INCLUDE;
 781                                 add = 1;
 782                         } else /* MCAST_LEAVE_SOURCE_GROUP */ {
 783                                 omode = MCAST_INCLUDE;
 784                                 add = 0;
 785                         }
 786                         err = ip_mc_source(add, omode, sk, &mreqs,
 787                                 greqs.gsr_interface);
 788                         break;
 789                 }
 790                 case MCAST_MSFILTER:
 791                 {
 792                         extern int sysctl_igmp_max_msf;
 793                         struct sockaddr_in *psin;
 794                         struct ip_msfilter *msf = NULL;
 795                         struct group_filter *gsf = NULL;
 796                         int msize, i, ifindex;
 797
 798                         if (optlen < GROUP_FILTER_SIZE(0))
 799                                 goto e_inval;
 800                         if (optlen > sysctl_optmem_max) {
 801                                 err = -ENOBUFS;
 802                                 break;
 803                         }
 804                         gsf = kmalloc(optlen,GFP_KERNEL);
 805                         if (gsf == 0) {
 806                                 err = -ENOBUFS;
 807                                 break;
 808                         }
 809                         err = -EFAULT;
 810                         if (copy_from_user(gsf, optval, optlen)) {
 811                                 goto mc_msf_out;
 812                         }
 813                         /* numsrc >= (4G-140)/128 overflow in 32 bits */
 814                         if (gsf->gf_numsrc >= 0x1ffffff ||
 815                             gsf->gf_numsrc > sysctl_igmp_max_msf) {
 816                                 err = -ENOBUFS;
 817                                 goto mc_msf_out;
 818                         }
 819                         if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 820                                 err = -EINVAL;
 821                                 goto mc_msf_out;
 822                         }
 823                         msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
 824                         msf = kmalloc(msize,GFP_KERNEL);
 825                         if (msf == 0) {
 826                                 err = -ENOBUFS;
 827                                 goto mc_msf_out;
 828                         }
 829                         ifindex = gsf->gf_interface;
 830                         psin = (struct sockaddr_in *)&gsf->gf_group;
 831                         if (psin->sin_family != AF_INET) {
 832                                 err = -EADDRNOTAVAIL;
 833                                 goto mc_msf_out;
 834                         }
 835                         msf->imsf_multiaddr = psin->sin_addr.s_addr;
 836                         msf->imsf_interface = 0;
 837                         msf->imsf_fmode = gsf->gf_fmode;
 838                         msf->imsf_numsrc = gsf->gf_numsrc;
 839                         err = -EADDRNOTAVAIL;
 840                         for (i=0; i<gsf->gf_numsrc; ++i) {
 841                                 psin = (struct sockaddr_in *)&gsf->gf_slist[i];
 842
 843                                 if (psin->sin_family != AF_INET)
 844                                         goto mc_msf_out;
 845                                 msf->imsf_slist[i] = psin->sin_addr.s_addr;
 846                         }
 847                         kfree(gsf);
 848                         gsf = NULL;
 849
 850                         err = ip_mc_msfilter(sk, msf, ifindex);
 851 mc_msf_out:
 852                         kfree(msf);
 853                         kfree(gsf);
 854                         break;
 855                 }
 856                 case IP_ROUTER_ALERT:
 857                         err = ip_ra_control(sk, val ? 1 : 0, NULL);
 858                         break;
 859
 860                 case IP_FREEBIND:
 861                         if (optlen<1)
 862                                 goto e_inval;
 863                         inet->freebind = !!val;
 864                         break;
 865
 866                 case IP_IPSEC_POLICY:
 867                 case IP_XFRM_POLICY:
 868                         err = -EPERM;
 869                         if (!capable(CAP_NET_ADMIN))
 870                                 break;
 871                         err = xfrm_user_policy(sk, optname, optval, optlen);
 872                         break;
 873
 874                 default:
 875                         err = -ENOPROTOOPT;
 876                         break;
 877         }
 878         release_sock(sk);
 879         return err;
 880
 881 e_inval:
 882         release_sock(sk);
 883         return -EINVAL;
 884 }
 885
 886 int ip_setsockopt(struct sock *sk, int level,
 887                 int optname, char __user *optval, int optlen)
 888 {
 889         int err;
 890
 891         if (level != SOL_IP)
 892                 return -ENOPROTOOPT;
 893
 894         err = do_ip_setsockopt(sk, level, optname, optval, optlen);
 895 #ifdef CONFIG_NETFILTER
 896         /* we need to exclude all possible ENOPROTOOPTs except default case */
 897         if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
 898                 optname != IP_IPSEC_POLICY && optname != IP_XFRM_POLICY
 899 #ifdef CONFIG_IP_MROUTE
 900                 && (optname < MRT_BASE || optname > (MRT_BASE + 10))
 901 #endif
 902            ) {
 903                 lock_sock(sk);
 904                 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
 905                 release_sock(sk);
 906         }
 907 #endif
 908         return err;
 909 }
 910
 911 #ifdef CONFIG_COMPAT
 912 int compat_ip_setsockopt(struct sock *sk, int level, int optname,
 913                          char __user *optval, int optlen)
 914 {
 915         int err;
 916
 917         if (level != SOL_IP)
 918                 return -ENOPROTOOPT;
 919
 920         err = do_ip_setsockopt(sk, level, optname, optval, optlen);
 921 #ifdef CONFIG_NETFILTER
 922         /* we need to exclude all possible ENOPROTOOPTs except default case */
 923         if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
 924             optname != IP_IPSEC_POLICY && optname != IP_XFRM_POLICY
 925 #ifdef CONFIG_IP_MROUTE
 926             && (optname < MRT_BASE || optname > (MRT_BASE + 10))
 927 #endif
 928            ) {
 929                 lock_sock(sk);
 930                 err = compat_nf_setsockopt(sk, PF_INET, optname,
 931                                            optval, optlen);
 932                 release_sock(sk);
 933         }
 934 #endif
 935         return err;
 936 }
 937
 938 EXPORT_SYMBOL(compat_ip_setsockopt);
 939 #endif
 940
 941 /*
 942  *      Get the options. Note for future reference. The GET of IP options gets the
 943  *      _received_ ones. The set sets the _sent_ ones.
 944  */
 945
 946 static int do_ip_getsockopt(struct sock *sk, int level, int optname,
 947                 char __user *optval, int __user *optlen)
 948 {
 949         struct inet_sock *inet = inet_sk(sk);
 950         int val;
 951         int len;
 952
 953         if(level!=SOL_IP)
 954                 return -EOPNOTSUPP;
 955
 956 #ifdef CONFIG_IP_MROUTE
 957         if(optname>=MRT_BASE && optname <=MRT_BASE+10)
 958         {
 959                 return ip_mroute_getsockopt(sk,optname,optval,optlen);
 960         }
 961 #endif
 962
 963         if(get_user(len,optlen))
 964                 return -EFAULT;
 965         if(len < 0)
 966                 return -EINVAL;
 967
 968         lock_sock(sk);
 969
 970         switch(optname) {
 971                 case IP_OPTIONS:
 972                         {
 973                                 unsigned char optbuf[sizeof(struct ip_options)+40];
 974                                 struct ip_options * opt = (struct ip_options*)optbuf;
 975                                 opt->optlen = 0;
 976                                 if (inet->opt)
 977                                         memcpy(optbuf, inet->opt,
 978                                                sizeof(struct ip_options)+
 979                                                inet->opt->optlen);
 980                                 release_sock(sk);
 981
 982                                 if (opt->optlen == 0)
 983                                         return put_user(0, optlen);
 984
 985                                 ip_options_undo(opt);
 986
 987                                 len = min_t(unsigned int, len, opt->optlen);
 988                                 if(put_user(len, optlen))
 989                                         return -EFAULT;
 990                                 if(copy_to_user(optval, opt->__data, len))
 991                                         return -EFAULT;
 992                                 return 0;
 993                         }
 994                 case IP_PKTINFO:
 995                         val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
 996                         break;
 997                 case IP_RECVTTL:
 998                         val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
 999                         break;
1000                 case IP_RECVTOS:
1001                         val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
1002                         break;
1003                 case IP_RECVOPTS:
1004                         val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
1005                         break;
1006                 case IP_RETOPTS:
1007                         val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
1008                         break;
1009                 case IP_PASSSEC:
1010                         val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
1011                         break;
1012                 case IP_TOS:
1013                         val = inet->tos;
1014                         break;
1015                 case IP_TTL:
1016                         val = (inet->uc_ttl == -1 ?
1017                                sysctl_ip_default_ttl :
1018                                inet->uc_ttl);
1019                         break;
1020                 case IP_HDRINCL:
1021                         val = inet->hdrincl;
1022                         break;
1023                 case IP_MTU_DISCOVER:
1024                         val = inet->pmtudisc;
1025                         break;
1026                 case IP_MTU:
1027                 {
1028                         struct dst_entry *dst;
1029                         val = 0;
1030                         dst = sk_dst_get(sk);
1031                         if (dst) {
1032                                 val = dst_mtu(dst);
1033                                 dst_release(dst);
1034                         }
1035                         if (!val) {
1036                                 release_sock(sk);
1037                                 return -ENOTCONN;
1038                         }
1039                         break;
1040                 }
1041                 case IP_RECVERR:
1042                         val = inet->recverr;
1043                         break;
1044                 case IP_MULTICAST_TTL:
1045                         val = inet->mc_ttl;
1046                         break;
1047                 case IP_MULTICAST_LOOP:
1048                         val = inet->mc_loop;
1049                         break;
1050                 case IP_MULTICAST_IF:
1051                 {
1052                         struct in_addr addr;
1053                         len = min_t(unsigned int, len, sizeof(struct in_addr));
1054                         addr.s_addr = inet->mc_addr;
1055                         release_sock(sk);
1056
1057                         if(put_user(len, optlen))
1058                                 return -EFAULT;
1059                         if(copy_to_user(optval, &addr, len))
1060                                 return -EFAULT;
1061                         return 0;
1062                 }
1063                 case IP_MSFILTER:
1064                 {
1065                         struct ip_msfilter msf;
1066                         int err;
1067
1068                         if (len < IP_MSFILTER_SIZE(0)) {
1069                                 release_sock(sk);
1070                                 return -EINVAL;
1071                         }
1072                         if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
1073                                 release_sock(sk);
1074                                 return -EFAULT;
1075                         }
1076                         err = ip_mc_msfget(sk, &msf,
1077                                 (struct ip_msfilter __user *)optval, optlen);
1078                         release_sock(sk);
1079                         return err;
1080                 }
1081                 case MCAST_MSFILTER:
1082                 {
1083                         struct group_filter gsf;
1084                         int err;
1085
1086                         if (len < GROUP_FILTER_SIZE(0)) {
1087                                 release_sock(sk);
1088                                 return -EINVAL;
1089                         }
1090                         if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
1091                                 release_sock(sk);
1092                                 return -EFAULT;
1093                         }
1094                         err = ip_mc_gsfget(sk, &gsf,
1095                                 (struct group_filter __user *)optval, optlen);
1096                         release_sock(sk);
1097                         return err;
1098                 }
1099                 case IP_PKTOPTIONS:
1100                 {
1101                         struct msghdr msg;
1102
1103                         release_sock(sk);
1104
1105                         if (sk->sk_type != SOCK_STREAM)
1106                                 return -ENOPROTOOPT;
1107
1108                         msg.msg_control = optval;
1109                         msg.msg_controllen = len;
1110                         msg.msg_flags = 0;
1111
1112                         if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
1113                                 struct in_pktinfo info;
1114
1115                                 info.ipi_addr.s_addr = inet->rcv_saddr;
1116                                 info.ipi_spec_dst.s_addr = inet->rcv_saddr;
1117                                 info.ipi_ifindex = inet->mc_index;
1118                                 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
1119                         }
1120                         if (inet->cmsg_flags & IP_CMSG_TTL) {
1121                                 int hlim = inet->mc_ttl;
1122                                 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
1123                         }
1124                         len -= msg.msg_controllen;
1125                         return put_user(len, optlen);
1126                 }
1127                 case IP_FREEBIND:
1128                         val = inet->freebind;
1129                         break;
1130                 default:
1131                         release_sock(sk);
1132                         return -ENOPROTOOPT;
1133         }
1134         release_sock(sk);
1135
1136         if (len < sizeof(int) && len > 0 && val>=0 && val<255) {
1137                 unsigned char ucval = (unsigned char)val;
1138                 len = 1;
1139                 if(put_user(len, optlen))
1140                         return -EFAULT;
1141                 if(copy_to_user(optval,&ucval,1))
1142                         return -EFAULT;
1143         } else {
1144                 len = min_t(unsigned int, sizeof(int), len);
1145                 if(put_user(len, optlen))
1146                         return -EFAULT;
1147                 if(copy_to_user(optval,&val,len))
1148                         return -EFAULT;
1149         }
1150         return 0;
1151 }
1152
1153 int ip_getsockopt(struct sock *sk, int level,
1154                 int optname, char __user *optval, int __user *optlen)
1155 {
1156         int err;
1157
1158         err = do_ip_getsockopt(sk, level, optname, optval, optlen);
1159 #ifdef CONFIG_NETFILTER
1160         /* we need to exclude all possible ENOPROTOOPTs except default case */
1161         if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS
1162 #ifdef CONFIG_IP_MROUTE
1163                 && (optname < MRT_BASE || optname > MRT_BASE+10)
1164 #endif
1165            ) {
1166                 int len;
1167
1168                 if(get_user(len,optlen))
1169                         return -EFAULT;
1170
1171                 lock_sock(sk);
1172                 err = nf_getsockopt(sk, PF_INET, optname, optval,
1173                                 &len);
1174                 release_sock(sk);
1175                 if (err >= 0)
1176                         err = put_user(len, optlen);
1177                 return err;
1178         }
1179 #endif
1180         return err;
1181 }
1182
1183 #ifdef CONFIG_COMPAT
1184 int compat_ip_getsockopt(struct sock *sk, int level, int optname,
1185                          char __user *optval, int __user *optlen)
1186 {
1187         int err = do_ip_getsockopt(sk, level, optname, optval, optlen);
1188 #ifdef CONFIG_NETFILTER
1189         /* we need to exclude all possible ENOPROTOOPTs except default case */
1190         if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS
1191 #ifdef CONFIG_IP_MROUTE
1192             && (optname < MRT_BASE || optname > MRT_BASE+10)
1193 #endif
1194            ) {
1195                 int len;
1196
1197                 if (get_user(len, optlen))
1198                         return -EFAULT;
1199
1200                 lock_sock(sk);
1201                 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
1202                 release_sock(sk);
1203                 if (err >= 0)
1204                         err = put_user(len, optlen);
1205                 return err;
1206         }
1207 #endif
1208         return err;
1209 }
1210
1211 EXPORT_SYMBOL(compat_ip_getsockopt);
1212 #endif
1213
1214 EXPORT_SYMBOL(ip_cmsg_recv);
1215
1216 EXPORT_SYMBOL(ip_getsockopt);
1217 EXPORT_SYMBOL(ip_setsockopt);