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, secid;
 116         int err;
 117
 118         err = security_socket_getpeersec_dgram(NULL, skb, &secid);
 119         if (err)
 120                 return;
 121
 122         err = security_secid_to_secctx(secid, &secdata, &seclen);
 123         if (err)
 124                 return;
 125
 126         put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata);
 127         security_release_secctx(secdata, seclen);
 128 }
 129
 130
 131 void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
 132 {
 133         struct inet_sock *inet = inet_sk(skb->sk);
 134         unsigned flags = inet->cmsg_flags;
 135
 136         /* Ordered by supposed usage frequency */
 137         if (flags & 1)
 138                 ip_cmsg_recv_pktinfo(msg, skb);
 139         if ((flags>>=1) == 0)
 140                 return;
 141
 142         if (flags & 1)
 143                 ip_cmsg_recv_ttl(msg, skb);
 144         if ((flags>>=1) == 0)
 145                 return;
 146
 147         if (flags & 1)
 148                 ip_cmsg_recv_tos(msg, skb);
 149         if ((flags>>=1) == 0)
 150                 return;
 151
 152         if (flags & 1)
 153                 ip_cmsg_recv_opts(msg, skb);
 154         if ((flags>>=1) == 0)
 155                 return;
 156
 157         if (flags & 1)
 158                 ip_cmsg_recv_retopts(msg, skb);
 159         if ((flags>>=1) == 0)
 160                 return;
 161
 162         if (flags & 1)
 163                 ip_cmsg_recv_security(msg, skb);
 164 }
 165
 166 int ip_cmsg_send(struct msghdr *msg, struct ipcm_cookie *ipc)
 167 {
 168         int err;
 169         struct cmsghdr *cmsg;
 170
 171         for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
 172                 if (!CMSG_OK(msg, cmsg))
 173                         return -EINVAL;
 174                 if (cmsg->cmsg_level != SOL_IP)
 175                         continue;
 176                 switch (cmsg->cmsg_type) {
 177                 case IP_RETOPTS:
 178                         err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
 179                         err = ip_options_get(&ipc->opt, CMSG_DATA(cmsg), err < 40 ? err : 40);
 180                         if (err)
 181                                 return err;
 182                         break;
 183                 case IP_PKTINFO:
 184                 {
 185                         struct in_pktinfo *info;
 186                         if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
 187                                 return -EINVAL;
 188                         info = (struct in_pktinfo *)CMSG_DATA(cmsg);
 189                         ipc->oif = info->ipi_ifindex;
 190                         ipc->addr = info->ipi_spec_dst.s_addr;
 191                         break;
 192                 }
 193                 default:
 194                         return -EINVAL;
 195                 }
 196         }
 197         return 0;
 198 }
 199
 200
 201 /* Special input handler for packets caught by router alert option.
 202    They are selected only by protocol field, and then processed likely
 203    local ones; but only if someone wants them! Otherwise, router
 204    not running rsvpd will kill RSVP.
 205
 206    It is user level problem, what it will make with them.
 207    I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
 208    but receiver should be enough clever f.e. to forward mtrace requests,
 209    sent to multicast group to reach destination designated router.
 210  */
 211 struct ip_ra_chain *ip_ra_chain;
 212 DEFINE_RWLOCK(ip_ra_lock);
 213
 214 int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *))
 215 {
 216         struct ip_ra_chain *ra, *new_ra, **rap;
 217
 218         if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num == IPPROTO_RAW)
 219                 return -EINVAL;
 220
 221         new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
 222
 223         write_lock_bh(&ip_ra_lock);
 224         for (rap = &ip_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
 225                 if (ra->sk == sk) {
 226                         if (on) {
 227                                 write_unlock_bh(&ip_ra_lock);
 228                                 kfree(new_ra);
 229                                 return -EADDRINUSE;
 230                         }
 231                         *rap = ra->next;
 232                         write_unlock_bh(&ip_ra_lock);
 233
 234                         if (ra->destructor)
 235                                 ra->destructor(sk);
 236                         sock_put(sk);
 237                         kfree(ra);
 238                         return 0;
 239                 }
 240         }
 241         if (new_ra == NULL) {
 242                 write_unlock_bh(&ip_ra_lock);
 243                 return -ENOBUFS;
 244         }
 245         new_ra->sk = sk;
 246         new_ra->destructor = destructor;
 247
 248         new_ra->next = ra;
 249         *rap = new_ra;
 250         sock_hold(sk);
 251         write_unlock_bh(&ip_ra_lock);
 252
 253         return 0;
 254 }
 255
 256 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
 257                    __be16 port, u32 info, u8 *payload)
 258 {
 259         struct inet_sock *inet = inet_sk(sk);
 260         struct sock_exterr_skb *serr;
 261
 262         if (!inet->recverr)
 263                 return;
 264
 265         skb = skb_clone(skb, GFP_ATOMIC);
 266         if (!skb)
 267                 return;
 268
 269         serr = SKB_EXT_ERR(skb);
 270         serr->ee.ee_errno = err;
 271         serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
 272         serr->ee.ee_type = skb->h.icmph->type;
 273         serr->ee.ee_code = skb->h.icmph->code;
 274         serr->ee.ee_pad = 0;
 275         serr->ee.ee_info = info;
 276         serr->ee.ee_data = 0;
 277         serr->addr_offset = (u8*)&(((struct iphdr*)(skb->h.icmph+1))->daddr) - skb->nh.raw;
 278         serr->port = port;
 279
 280         skb->h.raw = payload;
 281         if (!skb_pull(skb, payload - skb->data) ||
 282             sock_queue_err_skb(sk, skb))
 283                 kfree_skb(skb);
 284 }
 285
 286 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info)
 287 {
 288         struct inet_sock *inet = inet_sk(sk);
 289         struct sock_exterr_skb *serr;
 290         struct iphdr *iph;
 291         struct sk_buff *skb;
 292
 293         if (!inet->recverr)
 294                 return;
 295
 296         skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
 297         if (!skb)
 298                 return;
 299
 300         iph = (struct iphdr*)skb_put(skb, sizeof(struct iphdr));
 301         skb->nh.iph = iph;
 302         iph->daddr = daddr;
 303
 304         serr = SKB_EXT_ERR(skb);
 305         serr->ee.ee_errno = err;
 306         serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
 307         serr->ee.ee_type = 0;
 308         serr->ee.ee_code = 0;
 309         serr->ee.ee_pad = 0;
 310         serr->ee.ee_info = info;
 311         serr->ee.ee_data = 0;
 312         serr->addr_offset = (u8*)&iph->daddr - skb->nh.raw;
 313         serr->port = port;
 314
 315         skb->h.raw = skb->tail;
 316         __skb_pull(skb, skb->tail - skb->data);
 317
 318         if (sock_queue_err_skb(sk, skb))
 319                 kfree_skb(skb);
 320 }
 321
 322 /*
 323  *      Handle MSG_ERRQUEUE
 324  */
 325 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len)
 326 {
 327         struct sock_exterr_skb *serr;
 328         struct sk_buff *skb, *skb2;
 329         struct sockaddr_in *sin;
 330         struct {
 331                 struct sock_extended_err ee;
 332                 struct sockaddr_in       offender;
 333         } errhdr;
 334         int err;
 335         int copied;
 336
 337         err = -EAGAIN;
 338         skb = skb_dequeue(&sk->sk_error_queue);
 339         if (skb == NULL)
 340                 goto out;
 341
 342         copied = skb->len;
 343         if (copied > len) {
 344                 msg->msg_flags |= MSG_TRUNC;
 345                 copied = len;
 346         }
 347         err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
 348         if (err)
 349                 goto out_free_skb;
 350
 351         sock_recv_timestamp(msg, sk, skb);
 352
 353         serr = SKB_EXT_ERR(skb);
 354
 355         sin = (struct sockaddr_in *)msg->msg_name;
 356         if (sin) {
 357                 sin->sin_family = AF_INET;
 358                 sin->sin_addr.s_addr = *(__be32*)(skb->nh.raw + serr->addr_offset);
 359                 sin->sin_port = serr->port;
 360                 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
 361         }
 362
 363         memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
 364         sin = &errhdr.offender;
 365         sin->sin_family = AF_UNSPEC;
 366         if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) {
 367                 struct inet_sock *inet = inet_sk(sk);
 368
 369                 sin->sin_family = AF_INET;
 370                 sin->sin_addr.s_addr = skb->nh.iph->saddr;
 371                 sin->sin_port = 0;
 372                 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
 373                 if (inet->cmsg_flags)
 374                         ip_cmsg_recv(msg, skb);
 375         }
 376
 377         put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
 378
 379         /* Now we could try to dump offended packet options */
 380
 381         msg->msg_flags |= MSG_ERRQUEUE;
 382         err = copied;
 383
 384         /* Reset and regenerate socket error */
 385         spin_lock_bh(&sk->sk_error_queue.lock);
 386         sk->sk_err = 0;
 387         if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
 388                 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
 389                 spin_unlock_bh(&sk->sk_error_queue.lock);
 390                 sk->sk_error_report(sk);
 391         } else
 392                 spin_unlock_bh(&sk->sk_error_queue.lock);
 393
 394 out_free_skb:
 395         kfree_skb(skb);
 396 out:
 397         return err;
 398 }
 399
 400
 401 /*
 402  *      Socket option code for IP. This is the end of the line after any TCP,UDP etc options on
 403  *      an IP socket.
 404  */
 405
 406 static int do_ip_setsockopt(struct sock *sk, int level,
 407                 int optname, char __user *optval, int optlen)
 408 {
 409         struct inet_sock *inet = inet_sk(sk);
 410         int val=0,err;
 411
 412         if (((1<<optname) & ((1<<IP_PKTINFO) | (1<<IP_RECVTTL) |
 413                             (1<<IP_RECVOPTS) | (1<<IP_RECVTOS) |
 414                             (1<<IP_RETOPTS) | (1<<IP_TOS) |
 415                             (1<<IP_TTL) | (1<<IP_HDRINCL) |
 416                             (1<<IP_MTU_DISCOVER) | (1<<IP_RECVERR) |
 417                             (1<<IP_ROUTER_ALERT) | (1<<IP_FREEBIND) |
 418                             (1<<IP_PASSSEC))) ||
 419                                 optname == IP_MULTICAST_TTL ||
 420                                 optname == IP_MULTICAST_LOOP) {
 421                 if (optlen >= sizeof(int)) {
 422                         if (get_user(val, (int __user *) optval))
 423                                 return -EFAULT;
 424                 } else if (optlen >= sizeof(char)) {
 425                         unsigned char ucval;
 426
 427                         if (get_user(ucval, (unsigned char __user *) optval))
 428                                 return -EFAULT;
 429                         val = (int) ucval;
 430                 }
 431         }
 432
 433         /* If optlen==0, it is equivalent to val == 0 */
 434
 435 #ifdef CONFIG_IP_MROUTE
 436         if (optname >= MRT_BASE && optname <= (MRT_BASE + 10))
 437                 return ip_mroute_setsockopt(sk,optname,optval,optlen);
 438 #endif
 439
 440         err = 0;
 441         lock_sock(sk);
 442
 443         switch (optname) {
 444                 case IP_OPTIONS:
 445                 {
 446                         struct ip_options * opt = NULL;
 447                         if (optlen > 40 || optlen < 0)
 448                                 goto e_inval;
 449                         err = ip_options_get_from_user(&opt, optval, optlen);
 450                         if (err)
 451                                 break;
 452                         if (inet->is_icsk) {
 453                                 struct inet_connection_sock *icsk = inet_csk(sk);
 454 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 455                                 if (sk->sk_family == PF_INET ||
 456                                     (!((1 << sk->sk_state) &
 457                                        (TCPF_LISTEN | TCPF_CLOSE)) &&
 458                                      inet->daddr != LOOPBACK4_IPV6)) {
 459 #endif
 460                                         if (inet->opt)
 461                                                 icsk->icsk_ext_hdr_len -= inet->opt->optlen;
 462                                         if (opt)
 463                                                 icsk->icsk_ext_hdr_len += opt->optlen;
 464                                         icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
 465 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 466                                 }
 467 #endif
 468                         }
 469                         opt = xchg(&inet->opt, opt);
 470                         kfree(opt);
 471                         break;
 472                 }
 473                 case IP_PKTINFO:
 474                         if (val)
 475                                 inet->cmsg_flags |= IP_CMSG_PKTINFO;
 476                         else
 477                                 inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
 478                         break;
 479                 case IP_RECVTTL:
 480                         if (val)
 481                                 inet->cmsg_flags |=  IP_CMSG_TTL;
 482                         else
 483                                 inet->cmsg_flags &= ~IP_CMSG_TTL;
 484                         break;
 485                 case IP_RECVTOS:
 486                         if (val)
 487                                 inet->cmsg_flags |=  IP_CMSG_TOS;
 488                         else
 489                                 inet->cmsg_flags &= ~IP_CMSG_TOS;
 490                         break;
 491                 case IP_RECVOPTS:
 492                         if (val)
 493                                 inet->cmsg_flags |=  IP_CMSG_RECVOPTS;
 494                         else
 495                                 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
 496                         break;
 497                 case IP_RETOPTS:
 498                         if (val)
 499                                 inet->cmsg_flags |= IP_CMSG_RETOPTS;
 500                         else
 501                                 inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
 502                         break;
 503                 case IP_PASSSEC:
 504                         if (val)
 505                                 inet->cmsg_flags |= IP_CMSG_PASSSEC;
 506                         else
 507                                 inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
 508                         break;
 509                 case IP_TOS:    /* This sets both TOS and Precedence */
 510                         if (sk->sk_type == SOCK_STREAM) {
 511                                 val &= ~3;
 512                                 val |= inet->tos & 3;
 513                         }
 514                         if (IPTOS_PREC(val) >= IPTOS_PREC_CRITIC_ECP &&
 515                             !capable(CAP_NET_ADMIN)) {
 516                                 err = -EPERM;
 517                                 break;
 518                         }
 519                         if (inet->tos != val) {
 520                                 inet->tos = val;
 521                                 sk->sk_priority = rt_tos2priority(val);
 522                                 sk_dst_reset(sk);
 523                         }
 524                         break;
 525                 case IP_TTL:
 526                         if (optlen<1)
 527                                 goto e_inval;
 528                         if (val != -1 && (val < 1 || val>255))
 529                                 goto e_inval;
 530                         inet->uc_ttl = val;
 531                         break;
 532                 case IP_HDRINCL:
 533                         if (sk->sk_type != SOCK_RAW) {
 534                                 err = -ENOPROTOOPT;
 535                                 break;
 536                         }
 537                         inet->hdrincl = val ? 1 : 0;
 538                         break;
 539                 case IP_MTU_DISCOVER:
 540                         if (val<0 || val>2)
 541                                 goto e_inval;
 542                         inet->pmtudisc = val;
 543                         break;
 544                 case IP_RECVERR:
 545                         inet->recverr = !!val;
 546                         if (!val)
 547                                 skb_queue_purge(&sk->sk_error_queue);
 548                         break;
 549                 case IP_MULTICAST_TTL:
 550                         if (sk->sk_type == SOCK_STREAM)
 551                                 goto e_inval;
 552                         if (optlen<1)
 553                                 goto e_inval;
 554                         if (val==-1)
 555                                 val = 1;
 556                         if (val < 0 || val > 255)
 557                                 goto e_inval;
 558                         inet->mc_ttl = val;
 559                         break;
 560                 case IP_MULTICAST_LOOP:
 561                         if (optlen<1)
 562                                 goto e_inval;
 563                         inet->mc_loop = !!val;
 564                         break;
 565                 case IP_MULTICAST_IF:
 566                 {
 567                         struct ip_mreqn mreq;
 568                         struct net_device *dev = NULL;
 569
 570                         if (sk->sk_type == SOCK_STREAM)
 571                                 goto e_inval;
 572                         /*
 573                          *      Check the arguments are allowable
 574                          */
 575
 576                         err = -EFAULT;
 577                         if (optlen >= sizeof(struct ip_mreqn)) {
 578                                 if (copy_from_user(&mreq,optval,sizeof(mreq)))
 579                                         break;
 580                         } else {
 581                                 memset(&mreq, 0, sizeof(mreq));
 582                                 if (optlen >= sizeof(struct in_addr) &&
 583                                     copy_from_user(&mreq.imr_address,optval,sizeof(struct in_addr)))
 584                                         break;
 585                         }
 586
 587                         if (!mreq.imr_ifindex) {
 588                                 if (mreq.imr_address.s_addr == INADDR_ANY) {
 589                                         inet->mc_index = 0;
 590                                         inet->mc_addr  = 0;
 591                                         err = 0;
 592                                         break;
 593                                 }
 594                                 dev = ip_dev_find(mreq.imr_address.s_addr);
 595                                 if (dev) {
 596                                         mreq.imr_ifindex = dev->ifindex;
 597                                         dev_put(dev);
 598                                 }
 599                         } else
 600                                 dev = __dev_get_by_index(mreq.imr_ifindex);
 601
 602
 603                         err = -EADDRNOTAVAIL;
 604                         if (!dev)
 605                                 break;
 606
 607                         err = -EINVAL;
 608                         if (sk->sk_bound_dev_if &&
 609                             mreq.imr_ifindex != sk->sk_bound_dev_if)
 610                                 break;
 611
 612                         inet->mc_index = mreq.imr_ifindex;
 613                         inet->mc_addr  = mreq.imr_address.s_addr;
 614                         err = 0;
 615                         break;
 616                 }
 617
 618                 case IP_ADD_MEMBERSHIP:
 619                 case IP_DROP_MEMBERSHIP:
 620                 {
 621                         struct ip_mreqn mreq;
 622
 623                         if (optlen < sizeof(struct ip_mreq))
 624                                 goto e_inval;
 625                         err = -EFAULT;
 626                         if (optlen >= sizeof(struct ip_mreqn)) {
 627                                 if(copy_from_user(&mreq,optval,sizeof(mreq)))
 628                                         break;
 629                         } else {
 630                                 memset(&mreq, 0, sizeof(mreq));
 631                                 if (copy_from_user(&mreq,optval,sizeof(struct ip_mreq)))
 632                                         break;
 633                         }
 634
 635                         if (optname == IP_ADD_MEMBERSHIP)
 636                                 err = ip_mc_join_group(sk, &mreq);
 637                         else
 638                                 err = ip_mc_leave_group(sk, &mreq);
 639                         break;
 640                 }
 641                 case IP_MSFILTER:
 642                 {
 643                         extern int sysctl_igmp_max_msf;
 644                         struct ip_msfilter *msf;
 645
 646                         if (optlen < IP_MSFILTER_SIZE(0))
 647                                 goto e_inval;
 648                         if (optlen > sysctl_optmem_max) {
 649                                 err = -ENOBUFS;
 650                                 break;
 651                         }
 652                         msf = kmalloc(optlen, GFP_KERNEL);
 653                         if (msf == 0) {
 654                                 err = -ENOBUFS;
 655                                 break;
 656                         }
 657                         err = -EFAULT;
 658                         if (copy_from_user(msf, optval, optlen)) {
 659                                 kfree(msf);
 660                                 break;
 661                         }
 662                         /* numsrc >= (1G-4) overflow in 32 bits */
 663                         if (msf->imsf_numsrc >= 0x3ffffffcU ||
 664                             msf->imsf_numsrc > sysctl_igmp_max_msf) {
 665                                 kfree(msf);
 666                                 err = -ENOBUFS;
 667                                 break;
 668                         }
 669                         if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
 670                                 kfree(msf);
 671                                 err = -EINVAL;
 672                                 break;
 673                         }
 674                         err = ip_mc_msfilter(sk, msf, 0);
 675                         kfree(msf);
 676                         break;
 677                 }
 678                 case IP_BLOCK_SOURCE:
 679                 case IP_UNBLOCK_SOURCE:
 680                 case IP_ADD_SOURCE_MEMBERSHIP:
 681                 case IP_DROP_SOURCE_MEMBERSHIP:
 682                 {
 683                         struct ip_mreq_source mreqs;
 684                         int omode, add;
 685
 686                         if (optlen != sizeof(struct ip_mreq_source))
 687                                 goto e_inval;
 688                         if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
 689                                 err = -EFAULT;
 690                                 break;
 691                         }
 692                         if (optname == IP_BLOCK_SOURCE) {
 693                                 omode = MCAST_EXCLUDE;
 694                                 add = 1;
 695                         } else if (optname == IP_UNBLOCK_SOURCE) {
 696                                 omode = MCAST_EXCLUDE;
 697                                 add = 0;
 698                         } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
 699                                 struct ip_mreqn mreq;
 700
 701                                 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
 702                                 mreq.imr_address.s_addr = mreqs.imr_interface;
 703                                 mreq.imr_ifindex = 0;
 704                                 err = ip_mc_join_group(sk, &mreq);
 705                                 if (err && err != -EADDRINUSE)
 706                                         break;
 707                                 omode = MCAST_INCLUDE;
 708                                 add = 1;
 709                         } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
 710                                 omode = MCAST_INCLUDE;
 711                                 add = 0;
 712                         }
 713                         err = ip_mc_source(add, omode, sk, &mreqs, 0);
 714                         break;
 715                 }
 716                 case MCAST_JOIN_GROUP:
 717                 case MCAST_LEAVE_GROUP:
 718                 {
 719                         struct group_req greq;
 720                         struct sockaddr_in *psin;
 721                         struct ip_mreqn mreq;
 722
 723                         if (optlen < sizeof(struct group_req))
 724                                 goto e_inval;
 725                         err = -EFAULT;
 726                         if(copy_from_user(&greq, optval, sizeof(greq)))
 727                                 break;
 728                         psin = (struct sockaddr_in *)&greq.gr_group;
 729                         if (psin->sin_family != AF_INET)
 730                                 goto e_inval;
 731                         memset(&mreq, 0, sizeof(mreq));
 732                         mreq.imr_multiaddr = psin->sin_addr;
 733                         mreq.imr_ifindex = greq.gr_interface;
 734
 735                         if (optname == MCAST_JOIN_GROUP)
 736                                 err = ip_mc_join_group(sk, &mreq);
 737                         else
 738                                 err = ip_mc_leave_group(sk, &mreq);
 739                         break;
 740                 }
 741                 case MCAST_JOIN_SOURCE_GROUP:
 742                 case MCAST_LEAVE_SOURCE_GROUP:
 743                 case MCAST_BLOCK_SOURCE:
 744                 case MCAST_UNBLOCK_SOURCE:
 745                 {
 746                         struct group_source_req greqs;
 747                         struct ip_mreq_source mreqs;
 748                         struct sockaddr_in *psin;
 749                         int omode, add;
 750
 751                         if (optlen != sizeof(struct group_source_req))
 752                                 goto e_inval;
 753                         if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 754                                 err = -EFAULT;
 755                                 break;
 756                         }
 757                         if (greqs.gsr_group.ss_family != AF_INET ||
 758                             greqs.gsr_source.ss_family != AF_INET) {
 759                                 err = -EADDRNOTAVAIL;
 760                                 break;
 761                         }
 762                         psin = (struct sockaddr_in *)&greqs.gsr_group;
 763                         mreqs.imr_multiaddr = psin->sin_addr.s_addr;
 764                         psin = (struct sockaddr_in *)&greqs.gsr_source;
 765                         mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
 766                         mreqs.imr_interface = 0; /* use index for mc_source */
 767
 768                         if (optname == MCAST_BLOCK_SOURCE) {
 769                                 omode = MCAST_EXCLUDE;
 770                                 add = 1;
 771                         } else if (optname == MCAST_UNBLOCK_SOURCE) {
 772                                 omode = MCAST_EXCLUDE;
 773                                 add = 0;
 774                         } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 775                                 struct ip_mreqn mreq;
 776
 777                                 psin = (struct sockaddr_in *)&greqs.gsr_group;
 778                                 mreq.imr_multiaddr = psin->sin_addr;
 779                                 mreq.imr_address.s_addr = 0;
 780                                 mreq.imr_ifindex = greqs.gsr_interface;
 781                                 err = ip_mc_join_group(sk, &mreq);
 782                                 if (err && err != -EADDRINUSE)
 783                                         break;
 784                                 greqs.gsr_interface = mreq.imr_ifindex;
 785                                 omode = MCAST_INCLUDE;
 786                                 add = 1;
 787                         } else /* MCAST_LEAVE_SOURCE_GROUP */ {
 788                                 omode = MCAST_INCLUDE;
 789                                 add = 0;
 790                         }
 791                         err = ip_mc_source(add, omode, sk, &mreqs,
 792                                 greqs.gsr_interface);
 793                         break;
 794                 }
 795                 case MCAST_MSFILTER:
 796                 {
 797                         extern int sysctl_igmp_max_msf;
 798                         struct sockaddr_in *psin;
 799                         struct ip_msfilter *msf = NULL;
 800                         struct group_filter *gsf = NULL;
 801                         int msize, i, ifindex;
 802
 803                         if (optlen < GROUP_FILTER_SIZE(0))
 804                                 goto e_inval;
 805                         if (optlen > sysctl_optmem_max) {
 806                                 err = -ENOBUFS;
 807                                 break;
 808                         }
 809                         gsf = kmalloc(optlen,GFP_KERNEL);
 810                         if (gsf == 0) {
 811                                 err = -ENOBUFS;
 812                                 break;
 813                         }
 814                         err = -EFAULT;
 815                         if (copy_from_user(gsf, optval, optlen)) {
 816                                 goto mc_msf_out;
 817                         }
 818                         /* numsrc >= (4G-140)/128 overflow in 32 bits */
 819                         if (gsf->gf_numsrc >= 0x1ffffff ||
 820                             gsf->gf_numsrc > sysctl_igmp_max_msf) {
 821                                 err = -ENOBUFS;
 822                                 goto mc_msf_out;
 823                         }
 824                         if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 825                                 err = -EINVAL;
 826                                 goto mc_msf_out;
 827                         }
 828                         msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
 829                         msf = kmalloc(msize,GFP_KERNEL);
 830                         if (msf == 0) {
 831                                 err = -ENOBUFS;
 832                                 goto mc_msf_out;
 833                         }
 834                         ifindex = gsf->gf_interface;
 835                         psin = (struct sockaddr_in *)&gsf->gf_group;
 836                         if (psin->sin_family != AF_INET) {
 837                                 err = -EADDRNOTAVAIL;
 838                                 goto mc_msf_out;
 839                         }
 840                         msf->imsf_multiaddr = psin->sin_addr.s_addr;
 841                         msf->imsf_interface = 0;
 842                         msf->imsf_fmode = gsf->gf_fmode;
 843                         msf->imsf_numsrc = gsf->gf_numsrc;
 844                         err = -EADDRNOTAVAIL;
 845                         for (i=0; i<gsf->gf_numsrc; ++i) {
 846                                 psin = (struct sockaddr_in *)&gsf->gf_slist[i];
 847
 848                                 if (psin->sin_family != AF_INET)
 849                                         goto mc_msf_out;
 850                                 msf->imsf_slist[i] = psin->sin_addr.s_addr;
 851                         }
 852                         kfree(gsf);
 853                         gsf = NULL;
 854
 855                         err = ip_mc_msfilter(sk, msf, ifindex);
 856 mc_msf_out:
 857                         kfree(msf);
 858                         kfree(gsf);
 859                         break;
 860                 }
 861                 case IP_ROUTER_ALERT:
 862                         err = ip_ra_control(sk, val ? 1 : 0, NULL);
 863                         break;
 864
 865                 case IP_FREEBIND:
 866                         if (optlen<1)
 867                                 goto e_inval;
 868                         inet->freebind = !!val;
 869                         break;
 870
 871                 case IP_IPSEC_POLICY:
 872                 case IP_XFRM_POLICY:
 873                         err = -EPERM;
 874                         if (!capable(CAP_NET_ADMIN))
 875                                 break;
 876                         err = xfrm_user_policy(sk, optname, optval, optlen);
 877                         break;
 878
 879                 default:
 880                         err = -ENOPROTOOPT;
 881                         break;
 882         }
 883         release_sock(sk);
 884         return err;
 885
 886 e_inval:
 887         release_sock(sk);
 888         return -EINVAL;
 889 }
 890
 891 int ip_setsockopt(struct sock *sk, int level,
 892                 int optname, char __user *optval, int optlen)
 893 {
 894         int err;
 895
 896         if (level != SOL_IP)
 897                 return -ENOPROTOOPT;
 898
 899         err = do_ip_setsockopt(sk, level, optname, optval, optlen);
 900 #ifdef CONFIG_NETFILTER
 901         /* we need to exclude all possible ENOPROTOOPTs except default case */
 902         if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
 903                 optname != IP_IPSEC_POLICY && optname != IP_XFRM_POLICY
 904 #ifdef CONFIG_IP_MROUTE
 905                 && (optname < MRT_BASE || optname > (MRT_BASE + 10))
 906 #endif
 907            ) {
 908                 lock_sock(sk);
 909                 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
 910                 release_sock(sk);
 911         }
 912 #endif
 913         return err;
 914 }
 915
 916 #ifdef CONFIG_COMPAT
 917 int compat_ip_setsockopt(struct sock *sk, int level, int optname,
 918                          char __user *optval, int optlen)
 919 {
 920         int err;
 921
 922         if (level != SOL_IP)
 923                 return -ENOPROTOOPT;
 924
 925         err = do_ip_setsockopt(sk, level, optname, optval, optlen);
 926 #ifdef CONFIG_NETFILTER
 927         /* we need to exclude all possible ENOPROTOOPTs except default case */
 928         if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
 929             optname != IP_IPSEC_POLICY && optname != IP_XFRM_POLICY
 930 #ifdef CONFIG_IP_MROUTE
 931             && (optname < MRT_BASE || optname > (MRT_BASE + 10))
 932 #endif
 933            ) {
 934                 lock_sock(sk);
 935                 err = compat_nf_setsockopt(sk, PF_INET, optname,
 936                                            optval, optlen);
 937                 release_sock(sk);
 938         }
 939 #endif
 940         return err;
 941 }
 942
 943 EXPORT_SYMBOL(compat_ip_setsockopt);
 944 #endif
 945
 946 /*
 947  *      Get the options. Note for future reference. The GET of IP options gets the
 948  *      _received_ ones. The set sets the _sent_ ones.
 949  */
 950
 951 static int do_ip_getsockopt(struct sock *sk, int level, int optname,
 952                 char __user *optval, int __user *optlen)
 953 {
 954         struct inet_sock *inet = inet_sk(sk);
 955         int val;
 956         int len;
 957
 958         if(level!=SOL_IP)
 959                 return -EOPNOTSUPP;
 960
 961 #ifdef CONFIG_IP_MROUTE
 962         if(optname>=MRT_BASE && optname <=MRT_BASE+10)
 963         {
 964                 return ip_mroute_getsockopt(sk,optname,optval,optlen);
 965         }
 966 #endif
 967
 968         if(get_user(len,optlen))
 969                 return -EFAULT;
 970         if(len < 0)
 971                 return -EINVAL;
 972
 973         lock_sock(sk);
 974
 975         switch(optname) {
 976                 case IP_OPTIONS:
 977                         {
 978                                 unsigned char optbuf[sizeof(struct ip_options)+40];
 979                                 struct ip_options * opt = (struct ip_options*)optbuf;
 980                                 opt->optlen = 0;
 981                                 if (inet->opt)
 982                                         memcpy(optbuf, inet->opt,
 983                                                sizeof(struct ip_options)+
 984                                                inet->opt->optlen);
 985                                 release_sock(sk);
 986
 987                                 if (opt->optlen == 0)
 988                                         return put_user(0, optlen);
 989
 990                                 ip_options_undo(opt);
 991
 992                                 len = min_t(unsigned int, len, opt->optlen);
 993                                 if(put_user(len, optlen))
 994                                         return -EFAULT;
 995                                 if(copy_to_user(optval, opt->__data, len))
 996                                         return -EFAULT;
 997                                 return 0;
 998                         }
 999                 case IP_PKTINFO:
1000                         val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
1001                         break;
1002                 case IP_RECVTTL:
1003                         val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
1004                         break;
1005                 case IP_RECVTOS:
1006                         val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
1007                         break;
1008                 case IP_RECVOPTS:
1009                         val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
1010                         break;
1011                 case IP_RETOPTS:
1012                         val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
1013                         break;
1014                 case IP_PASSSEC:
1015                         val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
1016                         break;
1017                 case IP_TOS:
1018                         val = inet->tos;
1019                         break;
1020                 case IP_TTL:
1021                         val = (inet->uc_ttl == -1 ?
1022                                sysctl_ip_default_ttl :
1023                                inet->uc_ttl);
1024                         break;
1025                 case IP_HDRINCL:
1026                         val = inet->hdrincl;
1027                         break;
1028                 case IP_MTU_DISCOVER:
1029                         val = inet->pmtudisc;
1030                         break;
1031                 case IP_MTU:
1032                 {
1033                         struct dst_entry *dst;
1034                         val = 0;
1035                         dst = sk_dst_get(sk);
1036                         if (dst) {
1037                                 val = dst_mtu(dst);
1038                                 dst_release(dst);
1039                         }
1040                         if (!val) {
1041                                 release_sock(sk);
1042                                 return -ENOTCONN;
1043                         }
1044                         break;
1045                 }
1046                 case IP_RECVERR:
1047                         val = inet->recverr;
1048                         break;
1049                 case IP_MULTICAST_TTL:
1050                         val = inet->mc_ttl;
1051                         break;
1052                 case IP_MULTICAST_LOOP:
1053                         val = inet->mc_loop;
1054                         break;
1055                 case IP_MULTICAST_IF:
1056                 {
1057                         struct in_addr addr;
1058                         len = min_t(unsigned int, len, sizeof(struct in_addr));
1059                         addr.s_addr = inet->mc_addr;
1060                         release_sock(sk);
1061
1062                         if(put_user(len, optlen))
1063                                 return -EFAULT;
1064                         if(copy_to_user(optval, &addr, len))
1065                                 return -EFAULT;
1066                         return 0;
1067                 }
1068                 case IP_MSFILTER:
1069                 {
1070                         struct ip_msfilter msf;
1071                         int err;
1072
1073                         if (len < IP_MSFILTER_SIZE(0)) {
1074                                 release_sock(sk);
1075                                 return -EINVAL;
1076                         }
1077                         if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
1078                                 release_sock(sk);
1079                                 return -EFAULT;
1080                         }
1081                         err = ip_mc_msfget(sk, &msf,
1082                                 (struct ip_msfilter __user *)optval, optlen);
1083                         release_sock(sk);
1084                         return err;
1085                 }
1086                 case MCAST_MSFILTER:
1087                 {
1088                         struct group_filter gsf;
1089                         int err;
1090
1091                         if (len < GROUP_FILTER_SIZE(0)) {
1092                                 release_sock(sk);
1093                                 return -EINVAL;
1094                         }
1095                         if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
1096                                 release_sock(sk);
1097                                 return -EFAULT;
1098                         }
1099                         err = ip_mc_gsfget(sk, &gsf,
1100                                 (struct group_filter __user *)optval, optlen);
1101                         release_sock(sk);
1102                         return err;
1103                 }
1104                 case IP_PKTOPTIONS:
1105                 {
1106                         struct msghdr msg;
1107
1108                         release_sock(sk);
1109
1110                         if (sk->sk_type != SOCK_STREAM)
1111                                 return -ENOPROTOOPT;
1112
1113                         msg.msg_control = optval;
1114                         msg.msg_controllen = len;
1115                         msg.msg_flags = 0;
1116
1117                         if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
1118                                 struct in_pktinfo info;
1119
1120                                 info.ipi_addr.s_addr = inet->rcv_saddr;
1121                                 info.ipi_spec_dst.s_addr = inet->rcv_saddr;
1122                                 info.ipi_ifindex = inet->mc_index;
1123                                 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
1124                         }
1125                         if (inet->cmsg_flags & IP_CMSG_TTL) {
1126                                 int hlim = inet->mc_ttl;
1127                                 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
1128                         }
1129                         len -= msg.msg_controllen;
1130                         return put_user(len, optlen);
1131                 }
1132                 case IP_FREEBIND:
1133                         val = inet->freebind;
1134                         break;
1135                 default:
1136                         release_sock(sk);
1137                         return -ENOPROTOOPT;
1138         }
1139         release_sock(sk);
1140
1141         if (len < sizeof(int) && len > 0 && val>=0 && val<255) {
1142                 unsigned char ucval = (unsigned char)val;
1143                 len = 1;
1144                 if(put_user(len, optlen))
1145                         return -EFAULT;
1146                 if(copy_to_user(optval,&ucval,1))
1147                         return -EFAULT;
1148         } else {
1149                 len = min_t(unsigned int, sizeof(int), len);
1150                 if(put_user(len, optlen))
1151                         return -EFAULT;
1152                 if(copy_to_user(optval,&val,len))
1153                         return -EFAULT;
1154         }
1155         return 0;
1156 }
1157
1158 int ip_getsockopt(struct sock *sk, int level,
1159                 int optname, char __user *optval, int __user *optlen)
1160 {
1161         int err;
1162
1163         err = do_ip_getsockopt(sk, level, optname, optval, optlen);
1164 #ifdef CONFIG_NETFILTER
1165         /* we need to exclude all possible ENOPROTOOPTs except default case */
1166         if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS
1167 #ifdef CONFIG_IP_MROUTE
1168                 && (optname < MRT_BASE || optname > MRT_BASE+10)
1169 #endif
1170            ) {
1171                 int len;
1172
1173                 if(get_user(len,optlen))
1174                         return -EFAULT;
1175
1176                 lock_sock(sk);
1177                 err = nf_getsockopt(sk, PF_INET, optname, optval,
1178                                 &len);
1179                 release_sock(sk);
1180                 if (err >= 0)
1181                         err = put_user(len, optlen);
1182                 return err;
1183         }
1184 #endif
1185         return err;
1186 }
1187
1188 #ifdef CONFIG_COMPAT
1189 int compat_ip_getsockopt(struct sock *sk, int level, int optname,
1190                          char __user *optval, int __user *optlen)
1191 {
1192         int err = do_ip_getsockopt(sk, level, optname, optval, optlen);
1193 #ifdef CONFIG_NETFILTER
1194         /* we need to exclude all possible ENOPROTOOPTs except default case */
1195         if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS
1196 #ifdef CONFIG_IP_MROUTE
1197             && (optname < MRT_BASE || optname > MRT_BASE+10)
1198 #endif
1199            ) {
1200                 int len;
1201
1202                 if (get_user(len, optlen))
1203                         return -EFAULT;
1204
1205                 lock_sock(sk);
1206                 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
1207                 release_sock(sk);
1208                 if (err >= 0)
1209                         err = put_user(len, optlen);
1210                 return err;
1211         }
1212 #endif
1213         return err;
1214 }
1215
1216 EXPORT_SYMBOL(compat_ip_getsockopt);
1217 #endif
1218
1219 EXPORT_SYMBOL(ip_cmsg_recv);
1220
1221 EXPORT_SYMBOL(ip_getsockopt);
1222 EXPORT_SYMBOL(ip_setsockopt);