ip_sockglue.c revision cb84663e4d239f23f0d872bc6463c272e74daad8
1/* 2 * INET An implementation of the TCP/IP protocol suite for the LINUX 3 * operating system. INET is implemented using the BSD Socket 4 * interface as the means of communication with the user level. 5 * 6 * The IP to API glue. 7 * 8 * Version: $Id: ip_sockglue.c,v 1.62 2002/02/01 22:01:04 davem Exp $ 9 * 10 * Authors: see ip.c 11 * 12 * Fixes: 13 * Many : Split from ip.c , see ip.c for history. 14 * Martin Mares : TOS setting fixed. 15 * Alan Cox : Fixed a couple of oopses in Martin's 16 * TOS tweaks. 17 * Mike McLagan : Routing by source 18 */ 19 20#include <linux/module.h> 21#include <linux/types.h> 22#include <linux/mm.h> 23#include <linux/skbuff.h> 24#include <linux/ip.h> 25#include <linux/icmp.h> 26#include <linux/inetdevice.h> 27#include <linux/netdevice.h> 28#include <net/sock.h> 29#include <net/ip.h> 30#include <net/icmp.h> 31#include <net/tcp_states.h> 32#include <linux/udp.h> 33#include <linux/igmp.h> 34#include <linux/netfilter.h> 35#include <linux/route.h> 36#include <linux/mroute.h> 37#include <net/route.h> 38#include <net/xfrm.h> 39#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 40#include <net/transp_v6.h> 41#endif 42 43#include <linux/errqueue.h> 44#include <asm/uaccess.h> 45 46#define IP_CMSG_PKTINFO 1 47#define IP_CMSG_TTL 2 48#define IP_CMSG_TOS 4 49#define IP_CMSG_RECVOPTS 8 50#define IP_CMSG_RETOPTS 16 51#define IP_CMSG_PASSSEC 32 52 53/* 54 * SOL_IP control messages. 55 */ 56 57static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb) 58{ 59 struct in_pktinfo info; 60 struct rtable *rt = skb->rtable; 61 62 info.ipi_addr.s_addr = ip_hdr(skb)->daddr; 63 if (rt) { 64 info.ipi_ifindex = rt->rt_iif; 65 info.ipi_spec_dst.s_addr = rt->rt_spec_dst; 66 } else { 67 info.ipi_ifindex = 0; 68 info.ipi_spec_dst.s_addr = 0; 69 } 70 71 put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); 72} 73 74static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb) 75{ 76 int ttl = ip_hdr(skb)->ttl; 77 put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl); 78} 79 80static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb) 81{ 82 put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos); 83} 84 85static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb) 86{ 87 if (IPCB(skb)->opt.optlen == 0) 88 return; 89 90 put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen, 91 ip_hdr(skb) + 1); 92} 93 94 95static 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 112static 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 131void 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 166int ip_cmsg_send(struct net *net, 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(net, &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 */ 211struct ip_ra_chain *ip_ra_chain; 212DEFINE_RWLOCK(ip_ra_lock); 213 214int 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 256void 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 = icmp_hdr(skb)->type; 273 serr->ee.ee_code = icmp_hdr(skb)->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 *)(icmp_hdr(skb) + 1))->daddr) - 278 skb_network_header(skb); 279 serr->port = port; 280 281 if (skb_pull(skb, payload - skb->data) != NULL) { 282 skb_reset_transport_header(skb); 283 if (sock_queue_err_skb(sk, skb) == 0) 284 return; 285 } 286 kfree_skb(skb); 287} 288 289void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info) 290{ 291 struct inet_sock *inet = inet_sk(sk); 292 struct sock_exterr_skb *serr; 293 struct iphdr *iph; 294 struct sk_buff *skb; 295 296 if (!inet->recverr) 297 return; 298 299 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC); 300 if (!skb) 301 return; 302 303 skb_put(skb, sizeof(struct iphdr)); 304 skb_reset_network_header(skb); 305 iph = ip_hdr(skb); 306 iph->daddr = daddr; 307 308 serr = SKB_EXT_ERR(skb); 309 serr->ee.ee_errno = err; 310 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; 311 serr->ee.ee_type = 0; 312 serr->ee.ee_code = 0; 313 serr->ee.ee_pad = 0; 314 serr->ee.ee_info = info; 315 serr->ee.ee_data = 0; 316 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); 317 serr->port = port; 318 319 __skb_pull(skb, skb_tail_pointer(skb) - skb->data); 320 skb_reset_transport_header(skb); 321 322 if (sock_queue_err_skb(sk, skb)) 323 kfree_skb(skb); 324} 325 326/* 327 * Handle MSG_ERRQUEUE 328 */ 329int ip_recv_error(struct sock *sk, struct msghdr *msg, int len) 330{ 331 struct sock_exterr_skb *serr; 332 struct sk_buff *skb, *skb2; 333 struct sockaddr_in *sin; 334 struct { 335 struct sock_extended_err ee; 336 struct sockaddr_in offender; 337 } errhdr; 338 int err; 339 int copied; 340 341 err = -EAGAIN; 342 skb = skb_dequeue(&sk->sk_error_queue); 343 if (skb == NULL) 344 goto out; 345 346 copied = skb->len; 347 if (copied > len) { 348 msg->msg_flags |= MSG_TRUNC; 349 copied = len; 350 } 351 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 352 if (err) 353 goto out_free_skb; 354 355 sock_recv_timestamp(msg, sk, skb); 356 357 serr = SKB_EXT_ERR(skb); 358 359 sin = (struct sockaddr_in *)msg->msg_name; 360 if (sin) { 361 sin->sin_family = AF_INET; 362 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) + 363 serr->addr_offset); 364 sin->sin_port = serr->port; 365 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); 366 } 367 368 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); 369 sin = &errhdr.offender; 370 sin->sin_family = AF_UNSPEC; 371 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) { 372 struct inet_sock *inet = inet_sk(sk); 373 374 sin->sin_family = AF_INET; 375 sin->sin_addr.s_addr = ip_hdr(skb)->saddr; 376 sin->sin_port = 0; 377 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); 378 if (inet->cmsg_flags) 379 ip_cmsg_recv(msg, skb); 380 } 381 382 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr); 383 384 /* Now we could try to dump offended packet options */ 385 386 msg->msg_flags |= MSG_ERRQUEUE; 387 err = copied; 388 389 /* Reset and regenerate socket error */ 390 spin_lock_bh(&sk->sk_error_queue.lock); 391 sk->sk_err = 0; 392 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) { 393 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno; 394 spin_unlock_bh(&sk->sk_error_queue.lock); 395 sk->sk_error_report(sk); 396 } else 397 spin_unlock_bh(&sk->sk_error_queue.lock); 398 399out_free_skb: 400 kfree_skb(skb); 401out: 402 return err; 403} 404 405 406/* 407 * Socket option code for IP. This is the end of the line after any TCP,UDP etc options on 408 * an IP socket. 409 */ 410 411static int do_ip_setsockopt(struct sock *sk, int level, 412 int optname, char __user *optval, int optlen) 413{ 414 struct inet_sock *inet = inet_sk(sk); 415 int val=0,err; 416 417 if (((1<<optname) & ((1<<IP_PKTINFO) | (1<<IP_RECVTTL) | 418 (1<<IP_RECVOPTS) | (1<<IP_RECVTOS) | 419 (1<<IP_RETOPTS) | (1<<IP_TOS) | 420 (1<<IP_TTL) | (1<<IP_HDRINCL) | 421 (1<<IP_MTU_DISCOVER) | (1<<IP_RECVERR) | 422 (1<<IP_ROUTER_ALERT) | (1<<IP_FREEBIND) | 423 (1<<IP_PASSSEC))) || 424 optname == IP_MULTICAST_TTL || 425 optname == IP_MULTICAST_LOOP) { 426 if (optlen >= sizeof(int)) { 427 if (get_user(val, (int __user *) optval)) 428 return -EFAULT; 429 } else if (optlen >= sizeof(char)) { 430 unsigned char ucval; 431 432 if (get_user(ucval, (unsigned char __user *) optval)) 433 return -EFAULT; 434 val = (int) ucval; 435 } 436 } 437 438 /* If optlen==0, it is equivalent to val == 0 */ 439 440 if (ip_mroute_opt(optname)) 441 return ip_mroute_setsockopt(sk,optname,optval,optlen); 442 443 err = 0; 444 lock_sock(sk); 445 446 switch (optname) { 447 case IP_OPTIONS: 448 { 449 struct ip_options * opt = NULL; 450 if (optlen > 40 || optlen < 0) 451 goto e_inval; 452 err = ip_options_get_from_user(sk->sk_net, &opt, 453 optval, optlen); 454 if (err) 455 break; 456 if (inet->is_icsk) { 457 struct inet_connection_sock *icsk = inet_csk(sk); 458#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 459 if (sk->sk_family == PF_INET || 460 (!((1 << sk->sk_state) & 461 (TCPF_LISTEN | TCPF_CLOSE)) && 462 inet->daddr != LOOPBACK4_IPV6)) { 463#endif 464 if (inet->opt) 465 icsk->icsk_ext_hdr_len -= inet->opt->optlen; 466 if (opt) 467 icsk->icsk_ext_hdr_len += opt->optlen; 468 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie); 469#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 470 } 471#endif 472 } 473 opt = xchg(&inet->opt, opt); 474 kfree(opt); 475 break; 476 } 477 case IP_PKTINFO: 478 if (val) 479 inet->cmsg_flags |= IP_CMSG_PKTINFO; 480 else 481 inet->cmsg_flags &= ~IP_CMSG_PKTINFO; 482 break; 483 case IP_RECVTTL: 484 if (val) 485 inet->cmsg_flags |= IP_CMSG_TTL; 486 else 487 inet->cmsg_flags &= ~IP_CMSG_TTL; 488 break; 489 case IP_RECVTOS: 490 if (val) 491 inet->cmsg_flags |= IP_CMSG_TOS; 492 else 493 inet->cmsg_flags &= ~IP_CMSG_TOS; 494 break; 495 case IP_RECVOPTS: 496 if (val) 497 inet->cmsg_flags |= IP_CMSG_RECVOPTS; 498 else 499 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS; 500 break; 501 case IP_RETOPTS: 502 if (val) 503 inet->cmsg_flags |= IP_CMSG_RETOPTS; 504 else 505 inet->cmsg_flags &= ~IP_CMSG_RETOPTS; 506 break; 507 case IP_PASSSEC: 508 if (val) 509 inet->cmsg_flags |= IP_CMSG_PASSSEC; 510 else 511 inet->cmsg_flags &= ~IP_CMSG_PASSSEC; 512 break; 513 case IP_TOS: /* This sets both TOS and Precedence */ 514 if (sk->sk_type == SOCK_STREAM) { 515 val &= ~3; 516 val |= inet->tos & 3; 517 } 518 if (inet->tos != val) { 519 inet->tos = val; 520 sk->sk_priority = rt_tos2priority(val); 521 sk_dst_reset(sk); 522 } 523 break; 524 case IP_TTL: 525 if (optlen<1) 526 goto e_inval; 527 if (val != -1 && (val < 1 || val>255)) 528 goto e_inval; 529 inet->uc_ttl = val; 530 break; 531 case IP_HDRINCL: 532 if (sk->sk_type != SOCK_RAW) { 533 err = -ENOPROTOOPT; 534 break; 535 } 536 inet->hdrincl = val ? 1 : 0; 537 break; 538 case IP_MTU_DISCOVER: 539 if (val<0 || val>3) 540 goto e_inval; 541 inet->pmtudisc = val; 542 break; 543 case IP_RECVERR: 544 inet->recverr = !!val; 545 if (!val) 546 skb_queue_purge(&sk->sk_error_queue); 547 break; 548 case IP_MULTICAST_TTL: 549 if (sk->sk_type == SOCK_STREAM) 550 goto e_inval; 551 if (optlen<1) 552 goto e_inval; 553 if (val==-1) 554 val = 1; 555 if (val < 0 || val > 255) 556 goto e_inval; 557 inet->mc_ttl = val; 558 break; 559 case IP_MULTICAST_LOOP: 560 if (optlen<1) 561 goto e_inval; 562 inet->mc_loop = !!val; 563 break; 564 case IP_MULTICAST_IF: 565 { 566 struct ip_mreqn mreq; 567 struct net_device *dev = NULL; 568 569 if (sk->sk_type == SOCK_STREAM) 570 goto e_inval; 571 /* 572 * Check the arguments are allowable 573 */ 574 575 err = -EFAULT; 576 if (optlen >= sizeof(struct ip_mreqn)) { 577 if (copy_from_user(&mreq,optval,sizeof(mreq))) 578 break; 579 } else { 580 memset(&mreq, 0, sizeof(mreq)); 581 if (optlen >= sizeof(struct in_addr) && 582 copy_from_user(&mreq.imr_address,optval,sizeof(struct in_addr))) 583 break; 584 } 585 586 if (!mreq.imr_ifindex) { 587 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) { 588 inet->mc_index = 0; 589 inet->mc_addr = 0; 590 err = 0; 591 break; 592 } 593 dev = ip_dev_find(sk->sk_net, mreq.imr_address.s_addr); 594 if (dev) { 595 mreq.imr_ifindex = dev->ifindex; 596 dev_put(dev); 597 } 598 } else 599 dev = __dev_get_by_index(sk->sk_net, mreq.imr_ifindex); 600 601 602 err = -EADDRNOTAVAIL; 603 if (!dev) 604 break; 605 606 err = -EINVAL; 607 if (sk->sk_bound_dev_if && 608 mreq.imr_ifindex != sk->sk_bound_dev_if) 609 break; 610 611 inet->mc_index = mreq.imr_ifindex; 612 inet->mc_addr = mreq.imr_address.s_addr; 613 err = 0; 614 break; 615 } 616 617 case IP_ADD_MEMBERSHIP: 618 case IP_DROP_MEMBERSHIP: 619 { 620 struct ip_mreqn mreq; 621 622 err = -EPROTO; 623 if (inet_sk(sk)->is_icsk) 624 break; 625 626 if (optlen < sizeof(struct ip_mreq)) 627 goto e_inval; 628 err = -EFAULT; 629 if (optlen >= sizeof(struct ip_mreqn)) { 630 if (copy_from_user(&mreq,optval,sizeof(mreq))) 631 break; 632 } else { 633 memset(&mreq, 0, sizeof(mreq)); 634 if (copy_from_user(&mreq,optval,sizeof(struct ip_mreq))) 635 break; 636 } 637 638 if (optname == IP_ADD_MEMBERSHIP) 639 err = ip_mc_join_group(sk, &mreq); 640 else 641 err = ip_mc_leave_group(sk, &mreq); 642 break; 643 } 644 case IP_MSFILTER: 645 { 646 extern int sysctl_igmp_max_msf; 647 struct ip_msfilter *msf; 648 649 if (optlen < IP_MSFILTER_SIZE(0)) 650 goto e_inval; 651 if (optlen > sysctl_optmem_max) { 652 err = -ENOBUFS; 653 break; 654 } 655 msf = kmalloc(optlen, GFP_KERNEL); 656 if (!msf) { 657 err = -ENOBUFS; 658 break; 659 } 660 err = -EFAULT; 661 if (copy_from_user(msf, optval, optlen)) { 662 kfree(msf); 663 break; 664 } 665 /* numsrc >= (1G-4) overflow in 32 bits */ 666 if (msf->imsf_numsrc >= 0x3ffffffcU || 667 msf->imsf_numsrc > sysctl_igmp_max_msf) { 668 kfree(msf); 669 err = -ENOBUFS; 670 break; 671 } 672 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) { 673 kfree(msf); 674 err = -EINVAL; 675 break; 676 } 677 err = ip_mc_msfilter(sk, msf, 0); 678 kfree(msf); 679 break; 680 } 681 case IP_BLOCK_SOURCE: 682 case IP_UNBLOCK_SOURCE: 683 case IP_ADD_SOURCE_MEMBERSHIP: 684 case IP_DROP_SOURCE_MEMBERSHIP: 685 { 686 struct ip_mreq_source mreqs; 687 int omode, add; 688 689 if (optlen != sizeof(struct ip_mreq_source)) 690 goto e_inval; 691 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) { 692 err = -EFAULT; 693 break; 694 } 695 if (optname == IP_BLOCK_SOURCE) { 696 omode = MCAST_EXCLUDE; 697 add = 1; 698 } else if (optname == IP_UNBLOCK_SOURCE) { 699 omode = MCAST_EXCLUDE; 700 add = 0; 701 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) { 702 struct ip_mreqn mreq; 703 704 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr; 705 mreq.imr_address.s_addr = mreqs.imr_interface; 706 mreq.imr_ifindex = 0; 707 err = ip_mc_join_group(sk, &mreq); 708 if (err && err != -EADDRINUSE) 709 break; 710 omode = MCAST_INCLUDE; 711 add = 1; 712 } else /* IP_DROP_SOURCE_MEMBERSHIP */ { 713 omode = MCAST_INCLUDE; 714 add = 0; 715 } 716 err = ip_mc_source(add, omode, sk, &mreqs, 0); 717 break; 718 } 719 case MCAST_JOIN_GROUP: 720 case MCAST_LEAVE_GROUP: 721 { 722 struct group_req greq; 723 struct sockaddr_in *psin; 724 struct ip_mreqn mreq; 725 726 if (optlen < sizeof(struct group_req)) 727 goto e_inval; 728 err = -EFAULT; 729 if (copy_from_user(&greq, optval, sizeof(greq))) 730 break; 731 psin = (struct sockaddr_in *)&greq.gr_group; 732 if (psin->sin_family != AF_INET) 733 goto e_inval; 734 memset(&mreq, 0, sizeof(mreq)); 735 mreq.imr_multiaddr = psin->sin_addr; 736 mreq.imr_ifindex = greq.gr_interface; 737 738 if (optname == MCAST_JOIN_GROUP) 739 err = ip_mc_join_group(sk, &mreq); 740 else 741 err = ip_mc_leave_group(sk, &mreq); 742 break; 743 } 744 case MCAST_JOIN_SOURCE_GROUP: 745 case MCAST_LEAVE_SOURCE_GROUP: 746 case MCAST_BLOCK_SOURCE: 747 case MCAST_UNBLOCK_SOURCE: 748 { 749 struct group_source_req greqs; 750 struct ip_mreq_source mreqs; 751 struct sockaddr_in *psin; 752 int omode, add; 753 754 if (optlen != sizeof(struct group_source_req)) 755 goto e_inval; 756 if (copy_from_user(&greqs, optval, sizeof(greqs))) { 757 err = -EFAULT; 758 break; 759 } 760 if (greqs.gsr_group.ss_family != AF_INET || 761 greqs.gsr_source.ss_family != AF_INET) { 762 err = -EADDRNOTAVAIL; 763 break; 764 } 765 psin = (struct sockaddr_in *)&greqs.gsr_group; 766 mreqs.imr_multiaddr = psin->sin_addr.s_addr; 767 psin = (struct sockaddr_in *)&greqs.gsr_source; 768 mreqs.imr_sourceaddr = psin->sin_addr.s_addr; 769 mreqs.imr_interface = 0; /* use index for mc_source */ 770 771 if (optname == MCAST_BLOCK_SOURCE) { 772 omode = MCAST_EXCLUDE; 773 add = 1; 774 } else if (optname == MCAST_UNBLOCK_SOURCE) { 775 omode = MCAST_EXCLUDE; 776 add = 0; 777 } else if (optname == MCAST_JOIN_SOURCE_GROUP) { 778 struct ip_mreqn mreq; 779 780 psin = (struct sockaddr_in *)&greqs.gsr_group; 781 mreq.imr_multiaddr = psin->sin_addr; 782 mreq.imr_address.s_addr = 0; 783 mreq.imr_ifindex = greqs.gsr_interface; 784 err = ip_mc_join_group(sk, &mreq); 785 if (err && err != -EADDRINUSE) 786 break; 787 greqs.gsr_interface = mreq.imr_ifindex; 788 omode = MCAST_INCLUDE; 789 add = 1; 790 } else /* MCAST_LEAVE_SOURCE_GROUP */ { 791 omode = MCAST_INCLUDE; 792 add = 0; 793 } 794 err = ip_mc_source(add, omode, sk, &mreqs, 795 greqs.gsr_interface); 796 break; 797 } 798 case MCAST_MSFILTER: 799 { 800 extern int sysctl_igmp_max_msf; 801 struct sockaddr_in *psin; 802 struct ip_msfilter *msf = NULL; 803 struct group_filter *gsf = NULL; 804 int msize, i, ifindex; 805 806 if (optlen < GROUP_FILTER_SIZE(0)) 807 goto e_inval; 808 if (optlen > sysctl_optmem_max) { 809 err = -ENOBUFS; 810 break; 811 } 812 gsf = kmalloc(optlen,GFP_KERNEL); 813 if (!gsf) { 814 err = -ENOBUFS; 815 break; 816 } 817 err = -EFAULT; 818 if (copy_from_user(gsf, optval, optlen)) { 819 goto mc_msf_out; 820 } 821 /* numsrc >= (4G-140)/128 overflow in 32 bits */ 822 if (gsf->gf_numsrc >= 0x1ffffff || 823 gsf->gf_numsrc > sysctl_igmp_max_msf) { 824 err = -ENOBUFS; 825 goto mc_msf_out; 826 } 827 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) { 828 err = -EINVAL; 829 goto mc_msf_out; 830 } 831 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc); 832 msf = kmalloc(msize,GFP_KERNEL); 833 if (!msf) { 834 err = -ENOBUFS; 835 goto mc_msf_out; 836 } 837 ifindex = gsf->gf_interface; 838 psin = (struct sockaddr_in *)&gsf->gf_group; 839 if (psin->sin_family != AF_INET) { 840 err = -EADDRNOTAVAIL; 841 goto mc_msf_out; 842 } 843 msf->imsf_multiaddr = psin->sin_addr.s_addr; 844 msf->imsf_interface = 0; 845 msf->imsf_fmode = gsf->gf_fmode; 846 msf->imsf_numsrc = gsf->gf_numsrc; 847 err = -EADDRNOTAVAIL; 848 for (i=0; i<gsf->gf_numsrc; ++i) { 849 psin = (struct sockaddr_in *)&gsf->gf_slist[i]; 850 851 if (psin->sin_family != AF_INET) 852 goto mc_msf_out; 853 msf->imsf_slist[i] = psin->sin_addr.s_addr; 854 } 855 kfree(gsf); 856 gsf = NULL; 857 858 err = ip_mc_msfilter(sk, msf, ifindex); 859 mc_msf_out: 860 kfree(msf); 861 kfree(gsf); 862 break; 863 } 864 case IP_ROUTER_ALERT: 865 err = ip_ra_control(sk, val ? 1 : 0, NULL); 866 break; 867 868 case IP_FREEBIND: 869 if (optlen<1) 870 goto e_inval; 871 inet->freebind = !!val; 872 break; 873 874 case IP_IPSEC_POLICY: 875 case IP_XFRM_POLICY: 876 err = -EPERM; 877 if (!capable(CAP_NET_ADMIN)) 878 break; 879 err = xfrm_user_policy(sk, optname, optval, optlen); 880 break; 881 882 default: 883 err = -ENOPROTOOPT; 884 break; 885 } 886 release_sock(sk); 887 return err; 888 889e_inval: 890 release_sock(sk); 891 return -EINVAL; 892} 893 894int ip_setsockopt(struct sock *sk, int level, 895 int optname, char __user *optval, int optlen) 896{ 897 int err; 898 899 if (level != SOL_IP) 900 return -ENOPROTOOPT; 901 902 err = do_ip_setsockopt(sk, level, optname, optval, optlen); 903#ifdef CONFIG_NETFILTER 904 /* we need to exclude all possible ENOPROTOOPTs except default case */ 905 if (err == -ENOPROTOOPT && optname != IP_HDRINCL && 906 optname != IP_IPSEC_POLICY && 907 optname != IP_XFRM_POLICY && 908 !ip_mroute_opt(optname)) { 909 lock_sock(sk); 910 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen); 911 release_sock(sk); 912 } 913#endif 914 return err; 915} 916 917#ifdef CONFIG_COMPAT 918int compat_ip_setsockopt(struct sock *sk, int level, int optname, 919 char __user *optval, int optlen) 920{ 921 int err; 922 923 if (level != SOL_IP) 924 return -ENOPROTOOPT; 925 926 err = do_ip_setsockopt(sk, level, optname, optval, optlen); 927#ifdef CONFIG_NETFILTER 928 /* we need to exclude all possible ENOPROTOOPTs except default case */ 929 if (err == -ENOPROTOOPT && optname != IP_HDRINCL && 930 optname != IP_IPSEC_POLICY && 931 optname != IP_XFRM_POLICY && 932 !ip_mroute_opt(optname)) { 933 lock_sock(sk); 934 err = compat_nf_setsockopt(sk, PF_INET, optname, 935 optval, optlen); 936 release_sock(sk); 937 } 938#endif 939 return err; 940} 941 942EXPORT_SYMBOL(compat_ip_setsockopt); 943#endif 944 945/* 946 * Get the options. Note for future reference. The GET of IP options gets the 947 * _received_ ones. The set sets the _sent_ ones. 948 */ 949 950static int do_ip_getsockopt(struct sock *sk, int level, int optname, 951 char __user *optval, int __user *optlen) 952{ 953 struct inet_sock *inet = inet_sk(sk); 954 int val; 955 int len; 956 957 if (level != SOL_IP) 958 return -EOPNOTSUPP; 959 960 if (ip_mroute_opt(optname)) 961 return ip_mroute_getsockopt(sk,optname,optval,optlen); 962 963 if (get_user(len,optlen)) 964 return -EFAULT; 965 if (len < 0) 966 return -EINVAL; 967 968 lock_sock(sk); 969 970 switch (optname) { 971 case IP_OPTIONS: 972 { 973 unsigned char optbuf[sizeof(struct ip_options)+40]; 974 struct ip_options * opt = (struct ip_options*)optbuf; 975 opt->optlen = 0; 976 if (inet->opt) 977 memcpy(optbuf, inet->opt, 978 sizeof(struct ip_options)+ 979 inet->opt->optlen); 980 release_sock(sk); 981 982 if (opt->optlen == 0) 983 return put_user(0, optlen); 984 985 ip_options_undo(opt); 986 987 len = min_t(unsigned int, len, opt->optlen); 988 if (put_user(len, optlen)) 989 return -EFAULT; 990 if (copy_to_user(optval, opt->__data, len)) 991 return -EFAULT; 992 return 0; 993 } 994 case IP_PKTINFO: 995 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0; 996 break; 997 case IP_RECVTTL: 998 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0; 999 break; 1000 case IP_RECVTOS: 1001 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0; 1002 break; 1003 case IP_RECVOPTS: 1004 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0; 1005 break; 1006 case IP_RETOPTS: 1007 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0; 1008 break; 1009 case IP_PASSSEC: 1010 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0; 1011 break; 1012 case IP_TOS: 1013 val = inet->tos; 1014 break; 1015 case IP_TTL: 1016 val = (inet->uc_ttl == -1 ? 1017 sysctl_ip_default_ttl : 1018 inet->uc_ttl); 1019 break; 1020 case IP_HDRINCL: 1021 val = inet->hdrincl; 1022 break; 1023 case IP_MTU_DISCOVER: 1024 val = inet->pmtudisc; 1025 break; 1026 case IP_MTU: 1027 { 1028 struct dst_entry *dst; 1029 val = 0; 1030 dst = sk_dst_get(sk); 1031 if (dst) { 1032 val = dst_mtu(dst); 1033 dst_release(dst); 1034 } 1035 if (!val) { 1036 release_sock(sk); 1037 return -ENOTCONN; 1038 } 1039 break; 1040 } 1041 case IP_RECVERR: 1042 val = inet->recverr; 1043 break; 1044 case IP_MULTICAST_TTL: 1045 val = inet->mc_ttl; 1046 break; 1047 case IP_MULTICAST_LOOP: 1048 val = inet->mc_loop; 1049 break; 1050 case IP_MULTICAST_IF: 1051 { 1052 struct in_addr addr; 1053 len = min_t(unsigned int, len, sizeof(struct in_addr)); 1054 addr.s_addr = inet->mc_addr; 1055 release_sock(sk); 1056 1057 if (put_user(len, optlen)) 1058 return -EFAULT; 1059 if (copy_to_user(optval, &addr, len)) 1060 return -EFAULT; 1061 return 0; 1062 } 1063 case IP_MSFILTER: 1064 { 1065 struct ip_msfilter msf; 1066 int err; 1067 1068 if (len < IP_MSFILTER_SIZE(0)) { 1069 release_sock(sk); 1070 return -EINVAL; 1071 } 1072 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) { 1073 release_sock(sk); 1074 return -EFAULT; 1075 } 1076 err = ip_mc_msfget(sk, &msf, 1077 (struct ip_msfilter __user *)optval, optlen); 1078 release_sock(sk); 1079 return err; 1080 } 1081 case MCAST_MSFILTER: 1082 { 1083 struct group_filter gsf; 1084 int err; 1085 1086 if (len < GROUP_FILTER_SIZE(0)) { 1087 release_sock(sk); 1088 return -EINVAL; 1089 } 1090 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) { 1091 release_sock(sk); 1092 return -EFAULT; 1093 } 1094 err = ip_mc_gsfget(sk, &gsf, 1095 (struct group_filter __user *)optval, optlen); 1096 release_sock(sk); 1097 return err; 1098 } 1099 case IP_PKTOPTIONS: 1100 { 1101 struct msghdr msg; 1102 1103 release_sock(sk); 1104 1105 if (sk->sk_type != SOCK_STREAM) 1106 return -ENOPROTOOPT; 1107 1108 msg.msg_control = optval; 1109 msg.msg_controllen = len; 1110 msg.msg_flags = 0; 1111 1112 if (inet->cmsg_flags & IP_CMSG_PKTINFO) { 1113 struct in_pktinfo info; 1114 1115 info.ipi_addr.s_addr = inet->rcv_saddr; 1116 info.ipi_spec_dst.s_addr = inet->rcv_saddr; 1117 info.ipi_ifindex = inet->mc_index; 1118 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); 1119 } 1120 if (inet->cmsg_flags & IP_CMSG_TTL) { 1121 int hlim = inet->mc_ttl; 1122 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim); 1123 } 1124 len -= msg.msg_controllen; 1125 return put_user(len, optlen); 1126 } 1127 case IP_FREEBIND: 1128 val = inet->freebind; 1129 break; 1130 default: 1131 release_sock(sk); 1132 return -ENOPROTOOPT; 1133 } 1134 release_sock(sk); 1135 1136 if (len < sizeof(int) && len > 0 && val>=0 && val<255) { 1137 unsigned char ucval = (unsigned char)val; 1138 len = 1; 1139 if (put_user(len, optlen)) 1140 return -EFAULT; 1141 if (copy_to_user(optval,&ucval,1)) 1142 return -EFAULT; 1143 } else { 1144 len = min_t(unsigned int, sizeof(int), len); 1145 if (put_user(len, optlen)) 1146 return -EFAULT; 1147 if (copy_to_user(optval,&val,len)) 1148 return -EFAULT; 1149 } 1150 return 0; 1151} 1152 1153int ip_getsockopt(struct sock *sk, int level, 1154 int optname, char __user *optval, int __user *optlen) 1155{ 1156 int err; 1157 1158 err = do_ip_getsockopt(sk, level, optname, optval, optlen); 1159#ifdef CONFIG_NETFILTER 1160 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1161 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && 1162 !ip_mroute_opt(optname)) { 1163 int len; 1164 1165 if (get_user(len,optlen)) 1166 return -EFAULT; 1167 1168 lock_sock(sk); 1169 err = nf_getsockopt(sk, PF_INET, optname, optval, 1170 &len); 1171 release_sock(sk); 1172 if (err >= 0) 1173 err = put_user(len, optlen); 1174 return err; 1175 } 1176#endif 1177 return err; 1178} 1179 1180#ifdef CONFIG_COMPAT 1181int compat_ip_getsockopt(struct sock *sk, int level, int optname, 1182 char __user *optval, int __user *optlen) 1183{ 1184 int err = do_ip_getsockopt(sk, level, optname, optval, optlen); 1185#ifdef CONFIG_NETFILTER 1186 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1187 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && 1188 !ip_mroute_opt(optname)) { 1189 int len; 1190 1191 if (get_user(len, optlen)) 1192 return -EFAULT; 1193 1194 lock_sock(sk); 1195 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len); 1196 release_sock(sk); 1197 if (err >= 0) 1198 err = put_user(len, optlen); 1199 return err; 1200 } 1201#endif 1202 return err; 1203} 1204 1205EXPORT_SYMBOL(compat_ip_getsockopt); 1206#endif 1207 1208EXPORT_SYMBOL(ip_cmsg_recv); 1209 1210EXPORT_SYMBOL(ip_getsockopt); 1211EXPORT_SYMBOL(ip_setsockopt); 1212