net/ipv4/ip_sockglue.c

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