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/netdevice.h> 29 #include <net/sock.h> 30 #include <net/ip.h> 31 #include <net/icmp.h> 32 #include <net/tcp.h> 33 #include <linux/tcp.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 if (new_ra) 206 kfree(new_ra); 207 return -EADDRINUSE; 208 } 209 *rap = ra->next; 210 write_unlock_bh(&ip_ra_lock); 211 212 if (ra->destructor) 213 ra->destructor(sk); 214 sock_put(sk); 215 kfree(ra); 216 return 0; 217 } 218 } 219 if (new_ra == NULL) { 220 write_unlock_bh(&ip_ra_lock); 221 return -ENOBUFS; 222 } 223 new_ra->sk = sk; 224 new_ra->destructor = destructor; 225 226 new_ra->next = ra; 227 *rap = new_ra; 228 sock_hold(sk); 229 write_unlock_bh(&ip_ra_lock); 230 231 return 0; 232 } 233 234 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, 235 u16 port, u32 info, u8 *payload) 236 { 237 struct inet_sock *inet = inet_sk(sk); 238 struct sock_exterr_skb *serr; 239 240 if (!inet->recverr) 241 return; 242 243 skb = skb_clone(skb, GFP_ATOMIC); 244 if (!skb) 245 return; 246 247 serr = SKB_EXT_ERR(skb); 248 serr->ee.ee_errno = err; 249 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP; 250 serr->ee.ee_type = skb->h.icmph->type; 251 serr->ee.ee_code = skb->h.icmph->code; 252 serr->ee.ee_pad = 0; 253 serr->ee.ee_info = info; 254 serr->ee.ee_data = 0; 255 serr->addr_offset = (u8*)&(((struct iphdr*)(skb->h.icmph+1))->daddr) - skb->nh.raw; 256 serr->port = port; 257 258 skb->h.raw = payload; 259 if (!skb_pull(skb, payload - skb->data) || 260 sock_queue_err_skb(sk, skb)) 261 kfree_skb(skb); 262 } 263 264 void ip_local_error(struct sock *sk, int err, u32 daddr, u16 port, u32 info) 265 { 266 struct inet_sock *inet = inet_sk(sk); 267 struct sock_exterr_skb *serr; 268 struct iphdr *iph; 269 struct sk_buff *skb; 270 271 if (!inet->recverr) 272 return; 273 274 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC); 275 if (!skb) 276 return; 277 278 iph = (struct iphdr*)skb_put(skb, sizeof(struct iphdr)); 279 skb->nh.iph = iph; 280 iph->daddr = daddr; 281 282 serr = SKB_EXT_ERR(skb); 283 serr->ee.ee_errno = err; 284 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; 285 serr->ee.ee_type = 0; 286 serr->ee.ee_code = 0; 287 serr->ee.ee_pad = 0; 288 serr->ee.ee_info = info; 289 serr->ee.ee_data = 0; 290 serr->addr_offset = (u8*)&iph->daddr - skb->nh.raw; 291 serr->port = port; 292 293 skb->h.raw = skb->tail; 294 __skb_pull(skb, skb->tail - skb->data); 295 296 if (sock_queue_err_skb(sk, skb)) 297 kfree_skb(skb); 298 } 299 300 /* 301 * Handle MSG_ERRQUEUE 302 */ 303 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len) 304 { 305 struct sock_exterr_skb *serr; 306 struct sk_buff *skb, *skb2; 307 struct sockaddr_in *sin; 308 struct { 309 struct sock_extended_err ee; 310 struct sockaddr_in offender; 311 } errhdr; 312 int err; 313 int copied; 314 315 err = -EAGAIN; 316 skb = skb_dequeue(&sk->sk_error_queue); 317 if (skb == NULL) 318 goto out; 319 320 copied = skb->len; 321 if (copied > len) { 322 msg->msg_flags |= MSG_TRUNC; 323 copied = len; 324 } 325 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 326 if (err) 327 goto out_free_skb; 328 329 sock_recv_timestamp(msg, sk, skb); 330 331 serr = SKB_EXT_ERR(skb); 332 333 sin = (struct sockaddr_in *)msg->msg_name; 334 if (sin) { 335 sin->sin_family = AF_INET; 336 sin->sin_addr.s_addr = *(u32*)(skb->nh.raw + serr->addr_offset); 337 sin->sin_port = serr->port; 338 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); 339 } 340 341 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); 342 sin = &errhdr.offender; 343 sin->sin_family = AF_UNSPEC; 344 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) { 345 struct inet_sock *inet = inet_sk(sk); 346 347 sin->sin_family = AF_INET; 348 sin->sin_addr.s_addr = skb->nh.iph->saddr; 349 sin->sin_port = 0; 350 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); 351 if (inet->cmsg_flags) 352 ip_cmsg_recv(msg, skb); 353 } 354 355 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr); 356 357 /* Now we could try to dump offended packet options */ 358 359 msg->msg_flags |= MSG_ERRQUEUE; 360 err = copied; 361 362 /* Reset and regenerate socket error */ 363 spin_lock_bh(&sk->sk_error_queue.lock); 364 sk->sk_err = 0; 365 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) { 366 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno; 367 spin_unlock_bh(&sk->sk_error_queue.lock); 368 sk->sk_error_report(sk); 369 } else 370 spin_unlock_bh(&sk->sk_error_queue.lock); 371 372 out_free_skb: 373 kfree_skb(skb); 374 out: 375 return err; 376 } 377 378 379 /* 380 * Socket option code for IP. This is the end of the line after any TCP,UDP etc options on 381 * an IP socket. 382 */ 383 384 int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, int optlen) 385 { 386 struct inet_sock *inet = inet_sk(sk); 387 int val=0,err; 388 389 if (level != SOL_IP) 390 return -ENOPROTOOPT; 391 392 if (((1<<optname) & ((1<<IP_PKTINFO) | (1<<IP_RECVTTL) | 393 (1<<IP_RECVOPTS) | (1<<IP_RECVTOS) | 394 (1<<IP_RETOPTS) | (1<<IP_TOS) | 395 (1<<IP_TTL) | (1<<IP_HDRINCL) | 396 (1<<IP_MTU_DISCOVER) | (1<<IP_RECVERR) | 397 (1<<IP_ROUTER_ALERT) | (1<<IP_FREEBIND))) || 398 optname == IP_MULTICAST_TTL || 399 optname == IP_MULTICAST_LOOP) { 400 if (optlen >= sizeof(int)) { 401 if (get_user(val, (int __user *) optval)) 402 return -EFAULT; 403 } else if (optlen >= sizeof(char)) { 404 unsigned char ucval; 405 406 if (get_user(ucval, (unsigned char __user *) optval)) 407 return -EFAULT; 408 val = (int) ucval; 409 } 410 } 411 412 /* If optlen==0, it is equivalent to val == 0 */ 413 414 #ifdef CONFIG_IP_MROUTE 415 if (optname >= MRT_BASE && optname <= (MRT_BASE + 10)) 416 return ip_mroute_setsockopt(sk,optname,optval,optlen); 417 #endif 418 419 err = 0; 420 lock_sock(sk); 421 422 switch (optname) { 423 case IP_OPTIONS: 424 { 425 struct ip_options * opt = NULL; 426 if (optlen > 40 || optlen < 0) 427 goto e_inval; 428 err = ip_options_get_from_user(&opt, optval, optlen); 429 if (err) 430 break; 431 if (sk->sk_type == SOCK_STREAM) { 432 struct tcp_sock *tp = tcp_sk(sk); 433 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 434 if (sk->sk_family == PF_INET || 435 (!((1 << sk->sk_state) & 436 (TCPF_LISTEN | TCPF_CLOSE)) && 437 inet->daddr != LOOPBACK4_IPV6)) { 438 #endif 439 if (inet->opt) 440 tp->ext_header_len -= inet->opt->optlen; 441 if (opt) 442 tp->ext_header_len += opt->optlen; 443 tcp_sync_mss(sk, tp->pmtu_cookie); 444 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 445 } 446 #endif 447 } 448 opt = xchg(&inet->opt, opt); 449 if (opt) 450 kfree(opt); 451 break; 452 } 453 case IP_PKTINFO: 454 if (val) 455 inet->cmsg_flags |= IP_CMSG_PKTINFO; 456 else 457 inet->cmsg_flags &= ~IP_CMSG_PKTINFO; 458 break; 459 case IP_RECVTTL: 460 if (val) 461 inet->cmsg_flags |= IP_CMSG_TTL; 462 else 463 inet->cmsg_flags &= ~IP_CMSG_TTL; 464 break; 465 case IP_RECVTOS: 466 if (val) 467 inet->cmsg_flags |= IP_CMSG_TOS; 468 else 469 inet->cmsg_flags &= ~IP_CMSG_TOS; 470 break; 471 case IP_RECVOPTS: 472 if (val) 473 inet->cmsg_flags |= IP_CMSG_RECVOPTS; 474 else 475 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS; 476 break; 477 case IP_RETOPTS: 478 if (val) 479 inet->cmsg_flags |= IP_CMSG_RETOPTS; 480 else 481 inet->cmsg_flags &= ~IP_CMSG_RETOPTS; 482 break; 483 case IP_TOS: /* This sets both TOS and Precedence */ 484 if (sk->sk_type == SOCK_STREAM) { 485 val &= ~3; 486 val |= inet->tos & 3; 487 } 488 if (IPTOS_PREC(val) >= IPTOS_PREC_CRITIC_ECP && 489 !capable(CAP_NET_ADMIN)) { 490 err = -EPERM; 491 break; 492 } 493 if (inet->tos != val) { 494 inet->tos = val; 495 sk->sk_priority = rt_tos2priority(val); 496 sk_dst_reset(sk); 497 } 498 break; 499 case IP_TTL: 500 if (optlen<1) 501 goto e_inval; 502 if (val != -1 && (val < 1 || val>255)) 503 goto e_inval; 504 inet->uc_ttl = val; 505 break; 506 case IP_HDRINCL: 507 if (sk->sk_type != SOCK_RAW) { 508 err = -ENOPROTOOPT; 509 break; 510 } 511 inet->hdrincl = val ? 1 : 0; 512 break; 513 case IP_MTU_DISCOVER: 514 if (val<0 || val>2) 515 goto e_inval; 516 inet->pmtudisc = val; 517 break; 518 case IP_RECVERR: 519 inet->recverr = !!val; 520 if (!val) 521 skb_queue_purge(&sk->sk_error_queue); 522 break; 523 case IP_MULTICAST_TTL: 524 if (sk->sk_type == SOCK_STREAM) 525 goto e_inval; 526 if (optlen<1) 527 goto e_inval; 528 if (val==-1) 529 val = 1; 530 if (val < 0 || val > 255) 531 goto e_inval; 532 inet->mc_ttl = val; 533 break; 534 case IP_MULTICAST_LOOP: 535 if (optlen<1) 536 goto e_inval; 537 inet->mc_loop = !!val; 538 break; 539 case IP_MULTICAST_IF: 540 { 541 struct ip_mreqn mreq; 542 struct net_device *dev = NULL; 543 544 if (sk->sk_type == SOCK_STREAM) 545 goto e_inval; 546 /* 547 * Check the arguments are allowable 548 */ 549 550 err = -EFAULT; 551 if (optlen >= sizeof(struct ip_mreqn)) { 552 if (copy_from_user(&mreq,optval,sizeof(mreq))) 553 break; 554 } else { 555 memset(&mreq, 0, sizeof(mreq)); 556 if (optlen >= sizeof(struct in_addr) && 557 copy_from_user(&mreq.imr_address,optval,sizeof(struct in_addr))) 558 break; 559 } 560 561 if (!mreq.imr_ifindex) { 562 if (mreq.imr_address.s_addr == INADDR_ANY) { 563 inet->mc_index = 0; 564 inet->mc_addr = 0; 565 err = 0; 566 break; 567 } 568 dev = ip_dev_find(mreq.imr_address.s_addr); 569 if (dev) { 570 mreq.imr_ifindex = dev->ifindex; 571 dev_put(dev); 572 } 573 } else 574 dev = __dev_get_by_index(mreq.imr_ifindex); 575 576 577 err = -EADDRNOTAVAIL; 578 if (!dev) 579 break; 580 581 err = -EINVAL; 582 if (sk->sk_bound_dev_if && 583 mreq.imr_ifindex != sk->sk_bound_dev_if) 584 break; 585 586 inet->mc_index = mreq.imr_ifindex; 587 inet->mc_addr = mreq.imr_address.s_addr; 588 err = 0; 589 break; 590 } 591 592 case IP_ADD_MEMBERSHIP: 593 case IP_DROP_MEMBERSHIP: 594 { 595 struct ip_mreqn mreq; 596 597 if (optlen < sizeof(struct ip_mreq)) 598 goto e_inval; 599 err = -EFAULT; 600 if (optlen >= sizeof(struct ip_mreqn)) { 601 if(copy_from_user(&mreq,optval,sizeof(mreq))) 602 break; 603 } else { 604 memset(&mreq, 0, sizeof(mreq)); 605 if (copy_from_user(&mreq,optval,sizeof(struct ip_mreq))) 606 break; 607 } 608 609 if (optname == IP_ADD_MEMBERSHIP) 610 err = ip_mc_join_group(sk, &mreq); 611 else 612 err = ip_mc_leave_group(sk, &mreq); 613 break; 614 } 615 case IP_MSFILTER: 616 { 617 extern int sysctl_igmp_max_msf; 618 struct ip_msfilter *msf; 619 620 if (optlen < IP_MSFILTER_SIZE(0)) 621 goto e_inval; 622 if (optlen > sysctl_optmem_max) { 623 err = -ENOBUFS; 624 break; 625 } 626 msf = (struct ip_msfilter *)kmalloc(optlen, GFP_KERNEL); 627 if (msf == 0) { 628 err = -ENOBUFS; 629 break; 630 } 631 err = -EFAULT; 632 if (copy_from_user(msf, optval, optlen)) { 633 kfree(msf); 634 break; 635 } 636 /* numsrc >= (1G-4) overflow in 32 bits */ 637 if (msf->imsf_numsrc >= 0x3ffffffcU || 638 msf->imsf_numsrc > sysctl_igmp_max_msf) { 639 kfree(msf); 640 err = -ENOBUFS; 641 break; 642 } 643 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) { 644 kfree(msf); 645 err = -EINVAL; 646 break; 647 } 648 err = ip_mc_msfilter(sk, msf, 0); 649 kfree(msf); 650 break; 651 } 652 case IP_BLOCK_SOURCE: 653 case IP_UNBLOCK_SOURCE: 654 case IP_ADD_SOURCE_MEMBERSHIP: 655 case IP_DROP_SOURCE_MEMBERSHIP: 656 { 657 struct ip_mreq_source mreqs; 658 int omode, add; 659 660 if (optlen != sizeof(struct ip_mreq_source)) 661 goto e_inval; 662 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) { 663 err = -EFAULT; 664 break; 665 } 666 if (optname == IP_BLOCK_SOURCE) { 667 omode = MCAST_EXCLUDE; 668 add = 1; 669 } else if (optname == IP_UNBLOCK_SOURCE) { 670 omode = MCAST_EXCLUDE; 671 add = 0; 672 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) { 673 struct ip_mreqn mreq; 674 675 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr; 676 mreq.imr_address.s_addr = mreqs.imr_interface; 677 mreq.imr_ifindex = 0; 678 err = ip_mc_join_group(sk, &mreq); 679 if (err && err != -EADDRINUSE) 680 break; 681 omode = MCAST_INCLUDE; 682 add = 1; 683 } else /* IP_DROP_SOURCE_MEMBERSHIP */ { 684 omode = MCAST_INCLUDE; 685 add = 0; 686 } 687 err = ip_mc_source(add, omode, sk, &mreqs, 0); 688 break; 689 } 690 case MCAST_JOIN_GROUP: 691 case MCAST_LEAVE_GROUP: 692 { 693 struct group_req greq; 694 struct sockaddr_in *psin; 695 struct ip_mreqn mreq; 696 697 if (optlen < sizeof(struct group_req)) 698 goto e_inval; 699 err = -EFAULT; 700 if(copy_from_user(&greq, optval, sizeof(greq))) 701 break; 702 psin = (struct sockaddr_in *)&greq.gr_group; 703 if (psin->sin_family != AF_INET) 704 goto e_inval; 705 memset(&mreq, 0, sizeof(mreq)); 706 mreq.imr_multiaddr = psin->sin_addr; 707 mreq.imr_ifindex = greq.gr_interface; 708 709 if (optname == MCAST_JOIN_GROUP) 710 err = ip_mc_join_group(sk, &mreq); 711 else 712 err = ip_mc_leave_group(sk, &mreq); 713 break; 714 } 715 case MCAST_JOIN_SOURCE_GROUP: 716 case MCAST_LEAVE_SOURCE_GROUP: 717 case MCAST_BLOCK_SOURCE: 718 case MCAST_UNBLOCK_SOURCE: 719 { 720 struct group_source_req greqs; 721 struct ip_mreq_source mreqs; 722 struct sockaddr_in *psin; 723 int omode, add; 724 725 if (optlen != sizeof(struct group_source_req)) 726 goto e_inval; 727 if (copy_from_user(&greqs, optval, sizeof(greqs))) { 728 err = -EFAULT; 729 break; 730 } 731 if (greqs.gsr_group.ss_family != AF_INET || 732 greqs.gsr_source.ss_family != AF_INET) { 733 err = -EADDRNOTAVAIL; 734 break; 735 } 736 psin = (struct sockaddr_in *)&greqs.gsr_group; 737 mreqs.imr_multiaddr = psin->sin_addr.s_addr; 738 psin = (struct sockaddr_in *)&greqs.gsr_source; 739 mreqs.imr_sourceaddr = psin->sin_addr.s_addr; 740 mreqs.imr_interface = 0; /* use index for mc_source */ 741 742 if (optname == MCAST_BLOCK_SOURCE) { 743 omode = MCAST_EXCLUDE; 744 add = 1; 745 } else if (optname == MCAST_UNBLOCK_SOURCE) { 746 omode = MCAST_EXCLUDE; 747 add = 0; 748 } else if (optname == MCAST_JOIN_SOURCE_GROUP) { 749 struct ip_mreqn mreq; 750 751 psin = (struct sockaddr_in *)&greqs.gsr_group; 752 mreq.imr_multiaddr = psin->sin_addr; 753 mreq.imr_address.s_addr = 0; 754 mreq.imr_ifindex = greqs.gsr_interface; 755 err = ip_mc_join_group(sk, &mreq); 756 if (err && err != -EADDRINUSE) 757 break; 758 greqs.gsr_interface = mreq.imr_ifindex; 759 omode = MCAST_INCLUDE; 760 add = 1; 761 } else /* MCAST_LEAVE_SOURCE_GROUP */ { 762 omode = MCAST_INCLUDE; 763 add = 0; 764 } 765 err = ip_mc_source(add, omode, sk, &mreqs, 766 greqs.gsr_interface); 767 break; 768 } 769 case MCAST_MSFILTER: 770 { 771 extern int sysctl_igmp_max_msf; 772 struct sockaddr_in *psin; 773 struct ip_msfilter *msf = NULL; 774 struct group_filter *gsf = NULL; 775 int msize, i, ifindex; 776 777 if (optlen < GROUP_FILTER_SIZE(0)) 778 goto e_inval; 779 if (optlen > sysctl_optmem_max) { 780 err = -ENOBUFS; 781 break; 782 } 783 gsf = (struct group_filter *)kmalloc(optlen,GFP_KERNEL); 784 if (gsf == 0) { 785 err = -ENOBUFS; 786 break; 787 } 788 err = -EFAULT; 789 if (copy_from_user(gsf, optval, optlen)) { 790 goto mc_msf_out; 791 } 792 /* numsrc >= (4G-140)/128 overflow in 32 bits */ 793 if (gsf->gf_numsrc >= 0x1ffffff || 794 gsf->gf_numsrc > sysctl_igmp_max_msf) { 795 err = -ENOBUFS; 796 goto mc_msf_out; 797 } 798 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) { 799 err = -EINVAL; 800 goto mc_msf_out; 801 } 802 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc); 803 msf = (struct ip_msfilter *)kmalloc(msize,GFP_KERNEL); 804 if (msf == 0) { 805 err = -ENOBUFS; 806 goto mc_msf_out; 807 } 808 ifindex = gsf->gf_interface; 809 psin = (struct sockaddr_in *)&gsf->gf_group; 810 if (psin->sin_family != AF_INET) { 811 err = -EADDRNOTAVAIL; 812 goto mc_msf_out; 813 } 814 msf->imsf_multiaddr = psin->sin_addr.s_addr; 815 msf->imsf_interface = 0; 816 msf->imsf_fmode = gsf->gf_fmode; 817 msf->imsf_numsrc = gsf->gf_numsrc; 818 err = -EADDRNOTAVAIL; 819 for (i=0; i<gsf->gf_numsrc; ++i) { 820 psin = (struct sockaddr_in *)&gsf->gf_slist[i]; 821 822 if (psin->sin_family != AF_INET) 823 goto mc_msf_out; 824 msf->imsf_slist[i] = psin->sin_addr.s_addr; 825 } 826 kfree(gsf); 827 gsf = NULL; 828 829 err = ip_mc_msfilter(sk, msf, ifindex); 830 mc_msf_out: 831 if (msf) 832 kfree(msf); 833 if (gsf) 834 kfree(gsf); 835 break; 836 } 837 case IP_ROUTER_ALERT: 838 err = ip_ra_control(sk, val ? 1 : 0, NULL); 839 break; 840 841 case IP_FREEBIND: 842 if (optlen<1) 843 goto e_inval; 844 inet->freebind = !!val; 845 break; 846 847 case IP_IPSEC_POLICY: 848 case IP_XFRM_POLICY: 849 err = -EPERM; 850 if (!capable(CAP_NET_ADMIN)) 851 break; 852 err = xfrm_user_policy(sk, optname, optval, optlen); 853 break; 854 855 default: 856 #ifdef CONFIG_NETFILTER 857 err = nf_setsockopt(sk, PF_INET, optname, optval, 858 optlen); 859 #else 860 err = -ENOPROTOOPT; 861 #endif 862 break; 863 } 864 release_sock(sk); 865 return err; 866 867 e_inval: 868 release_sock(sk); 869 return -EINVAL; 870 } 871 872 /* 873 * Get the options. Note for future reference. The GET of IP options gets the 874 * _received_ ones. The set sets the _sent_ ones. 875 */ 876 877 int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, int __user *optlen) 878 { 879 struct inet_sock *inet = inet_sk(sk); 880 int val; 881 int len; 882 883 if(level!=SOL_IP) 884 return -EOPNOTSUPP; 885 886 #ifdef CONFIG_IP_MROUTE 887 if(optname>=MRT_BASE && optname <=MRT_BASE+10) 888 { 889 return ip_mroute_getsockopt(sk,optname,optval,optlen); 890 } 891 #endif 892 893 if(get_user(len,optlen)) 894 return -EFAULT; 895 if(len < 0) 896 return -EINVAL; 897 898 lock_sock(sk); 899 900 switch(optname) { 901 case IP_OPTIONS: 902 { 903 unsigned char optbuf[sizeof(struct ip_options)+40]; 904 struct ip_options * opt = (struct ip_options*)optbuf; 905 opt->optlen = 0; 906 if (inet->opt) 907 memcpy(optbuf, inet->opt, 908 sizeof(struct ip_options)+ 909 inet->opt->optlen); 910 release_sock(sk); 911 912 if (opt->optlen == 0) 913 return put_user(0, optlen); 914 915 ip_options_undo(opt); 916 917 len = min_t(unsigned int, len, opt->optlen); 918 if(put_user(len, optlen)) 919 return -EFAULT; 920 if(copy_to_user(optval, opt->__data, len)) 921 return -EFAULT; 922 return 0; 923 } 924 case IP_PKTINFO: 925 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0; 926 break; 927 case IP_RECVTTL: 928 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0; 929 break; 930 case IP_RECVTOS: 931 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0; 932 break; 933 case IP_RECVOPTS: 934 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0; 935 break; 936 case IP_RETOPTS: 937 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0; 938 break; 939 case IP_TOS: 940 val = inet->tos; 941 break; 942 case IP_TTL: 943 val = (inet->uc_ttl == -1 ? 944 sysctl_ip_default_ttl : 945 inet->uc_ttl); 946 break; 947 case IP_HDRINCL: 948 val = inet->hdrincl; 949 break; 950 case IP_MTU_DISCOVER: 951 val = inet->pmtudisc; 952 break; 953 case IP_MTU: 954 { 955 struct dst_entry *dst; 956 val = 0; 957 dst = sk_dst_get(sk); 958 if (dst) { 959 val = dst_mtu(dst); 960 dst_release(dst); 961 } 962 if (!val) { 963 release_sock(sk); 964 return -ENOTCONN; 965 } 966 break; 967 } 968 case IP_RECVERR: 969 val = inet->recverr; 970 break; 971 case IP_MULTICAST_TTL: 972 val = inet->mc_ttl; 973 break; 974 case IP_MULTICAST_LOOP: 975 val = inet->mc_loop; 976 break; 977 case IP_MULTICAST_IF: 978 { 979 struct in_addr addr; 980 len = min_t(unsigned int, len, sizeof(struct in_addr)); 981 addr.s_addr = inet->mc_addr; 982 release_sock(sk); 983 984 if(put_user(len, optlen)) 985 return -EFAULT; 986 if(copy_to_user(optval, &addr, len)) 987 return -EFAULT; 988 return 0; 989 } 990 case IP_MSFILTER: 991 { 992 struct ip_msfilter msf; 993 int err; 994 995 if (len < IP_MSFILTER_SIZE(0)) { 996 release_sock(sk); 997 return -EINVAL; 998 } 999 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) { 1000 release_sock(sk); 1001 return -EFAULT; 1002 } 1003 err = ip_mc_msfget(sk, &msf, 1004 (struct ip_msfilter __user *)optval, optlen); 1005 release_sock(sk); 1006 return err; 1007 } 1008 case MCAST_MSFILTER: 1009 { 1010 struct group_filter gsf; 1011 int err; 1012 1013 if (len < GROUP_FILTER_SIZE(0)) { 1014 release_sock(sk); 1015 return -EINVAL; 1016 } 1017 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) { 1018 release_sock(sk); 1019 return -EFAULT; 1020 } 1021 err = ip_mc_gsfget(sk, &gsf, 1022 (struct group_filter __user *)optval, optlen); 1023 release_sock(sk); 1024 return err; 1025 } 1026 case IP_PKTOPTIONS: 1027 { 1028 struct msghdr msg; 1029 1030 release_sock(sk); 1031 1032 if (sk->sk_type != SOCK_STREAM) 1033 return -ENOPROTOOPT; 1034 1035 msg.msg_control = optval; 1036 msg.msg_controllen = len; 1037 msg.msg_flags = 0; 1038 1039 if (inet->cmsg_flags & IP_CMSG_PKTINFO) { 1040 struct in_pktinfo info; 1041 1042 info.ipi_addr.s_addr = inet->rcv_saddr; 1043 info.ipi_spec_dst.s_addr = inet->rcv_saddr; 1044 info.ipi_ifindex = inet->mc_index; 1045 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); 1046 } 1047 if (inet->cmsg_flags & IP_CMSG_TTL) { 1048 int hlim = inet->mc_ttl; 1049 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim); 1050 } 1051 len -= msg.msg_controllen; 1052 return put_user(len, optlen); 1053 } 1054 case IP_FREEBIND: 1055 val = inet->freebind; 1056 break; 1057 default: 1058 #ifdef CONFIG_NETFILTER 1059 val = nf_getsockopt(sk, PF_INET, optname, optval, 1060 &len); 1061 release_sock(sk); 1062 if (val >= 0) 1063 val = put_user(len, optlen); 1064 return val; 1065 #else 1066 release_sock(sk); 1067 return -ENOPROTOOPT; 1068 #endif 1069 } 1070 release_sock(sk); 1071 1072 if (len < sizeof(int) && len > 0 && val>=0 && val<255) { 1073 unsigned char ucval = (unsigned char)val; 1074 len = 1; 1075 if(put_user(len, optlen)) 1076 return -EFAULT; 1077 if(copy_to_user(optval,&ucval,1)) 1078 return -EFAULT; 1079 } else { 1080 len = min_t(unsigned int, sizeof(int), len); 1081 if(put_user(len, optlen)) 1082 return -EFAULT; 1083 if(copy_to_user(optval,&val,len)) 1084 return -EFAULT; 1085 } 1086 return 0; 1087 } 1088 1089 EXPORT_SYMBOL(ip_cmsg_recv); 1090 1091 EXPORT_SYMBOL(ip_getsockopt); 1092 EXPORT_SYMBOL(ip_setsockopt); 1093