1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * IPv6 BSD socket options interface 4 * Linux INET6 implementation 5 * 6 * Authors: 7 * Pedro Roque <roque@di.fc.ul.pt> 8 * 9 * Based on linux/net/ipv4/ip_sockglue.c 10 * 11 * FIXME: Make the setsockopt code POSIX compliant: That is 12 * 13 * o Truncate getsockopt returns 14 * o Return an optlen of the truncated length if need be 15 * 16 * Changes: 17 * David L Stevens <dlstevens@us.ibm.com>: 18 * - added multicast source filtering API for MLDv2 19 */ 20 21#include <linux/module.h> 22#include <linux/capability.h> 23#include <linux/errno.h> 24#include <linux/types.h> 25#include <linux/socket.h> 26#include <linux/sockios.h> 27#include <linux/net.h> 28#include <linux/in6.h> 29#include <linux/mroute6.h> 30#include <linux/netdevice.h> 31#include <linux/if_arp.h> 32#include <linux/init.h> 33#include <linux/sysctl.h> 34#include <linux/netfilter.h> 35#include <linux/slab.h> 36 37#include <net/sock.h> 38#include <net/snmp.h> 39#include <net/ipv6.h> 40#include <net/ndisc.h> 41#include <net/protocol.h> 42#include <net/transp_v6.h> 43#include <net/ip6_route.h> 44#include <net/addrconf.h> 45#include <net/inet_common.h> 46#include <net/tcp.h> 47#include <net/udp.h> 48#include <net/udplite.h> 49#include <net/xfrm.h> 50#include <net/compat.h> 51#include <net/seg6.h> 52 53#include <linux/uaccess.h> 54 55struct ip6_ra_chain *ip6_ra_chain; 56DEFINE_RWLOCK(ip6_ra_lock); 57 58int ip6_ra_control(struct sock *sk, int sel) 59{ 60 struct ip6_ra_chain *ra, *new_ra, **rap; 61 62 /* RA packet may be delivered ONLY to IPPROTO_RAW socket */ 63 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num != IPPROTO_RAW) 64 return -ENOPROTOOPT; 65 66 new_ra = (sel >= 0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL; 67 if (sel >= 0 && !new_ra) 68 return -ENOMEM; 69 70 write_lock_bh(&ip6_ra_lock); 71 for (rap = &ip6_ra_chain; (ra = *rap) != NULL; rap = &ra->next) { 72 if (ra->sk == sk) { 73 if (sel >= 0) { 74 write_unlock_bh(&ip6_ra_lock); 75 kfree(new_ra); 76 return -EADDRINUSE; 77 } 78 79 *rap = ra->next; 80 write_unlock_bh(&ip6_ra_lock); 81 82 sock_put(sk); 83 kfree(ra); 84 return 0; 85 } 86 } 87 if (!new_ra) { 88 write_unlock_bh(&ip6_ra_lock); 89 return -ENOBUFS; 90 } 91 new_ra->sk = sk; 92 new_ra->sel = sel; 93 new_ra->next = ra; 94 *rap = new_ra; 95 sock_hold(sk); 96 write_unlock_bh(&ip6_ra_lock); 97 return 0; 98} 99 100struct ipv6_txoptions *ipv6_update_options(struct sock *sk, 101 struct ipv6_txoptions *opt) 102{ 103 if (inet_sk(sk)->is_icsk) { 104 if (opt && 105 !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) && 106 inet_sk(sk)->inet_daddr != LOOPBACK4_IPV6) { 107 struct inet_connection_sock *icsk = inet_csk(sk); 108 icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen; 109 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie); 110 } 111 } 112 opt = xchg((__force struct ipv6_txoptions **)&inet6_sk(sk)->opt, 113 opt); 114 sk_dst_reset(sk); 115 116 return opt; 117} 118 119static bool setsockopt_needs_rtnl(int optname) 120{ 121 switch (optname) { 122 case IPV6_ADDRFORM: 123 case IPV6_ADD_MEMBERSHIP: 124 case IPV6_DROP_MEMBERSHIP: 125 case IPV6_JOIN_ANYCAST: 126 case IPV6_LEAVE_ANYCAST: 127 case MCAST_JOIN_GROUP: 128 case MCAST_LEAVE_GROUP: 129 case MCAST_JOIN_SOURCE_GROUP: 130 case MCAST_LEAVE_SOURCE_GROUP: 131 case MCAST_BLOCK_SOURCE: 132 case MCAST_UNBLOCK_SOURCE: 133 case MCAST_MSFILTER: 134 return true; 135 } 136 return false; 137} 138 139static int copy_group_source_from_sockptr(struct group_source_req *greqs, 140 sockptr_t optval, int optlen) 141{ 142 if (in_compat_syscall()) { 143 struct compat_group_source_req gr32; 144 145 if (optlen < sizeof(gr32)) 146 return -EINVAL; 147 if (copy_from_sockptr(&gr32, optval, sizeof(gr32))) 148 return -EFAULT; 149 greqs->gsr_interface = gr32.gsr_interface; 150 greqs->gsr_group = gr32.gsr_group; 151 greqs->gsr_source = gr32.gsr_source; 152 } else { 153 if (optlen < sizeof(*greqs)) 154 return -EINVAL; 155 if (copy_from_sockptr(greqs, optval, sizeof(*greqs))) 156 return -EFAULT; 157 } 158 159 return 0; 160} 161 162static int do_ipv6_mcast_group_source(struct sock *sk, int optname, 163 sockptr_t optval, int optlen) 164{ 165 struct group_source_req greqs; 166 int omode, add; 167 int ret; 168 169 ret = copy_group_source_from_sockptr(&greqs, optval, optlen); 170 if (ret) 171 return ret; 172 173 if (greqs.gsr_group.ss_family != AF_INET6 || 174 greqs.gsr_source.ss_family != AF_INET6) 175 return -EADDRNOTAVAIL; 176 177 if (optname == MCAST_BLOCK_SOURCE) { 178 omode = MCAST_EXCLUDE; 179 add = 1; 180 } else if (optname == MCAST_UNBLOCK_SOURCE) { 181 omode = MCAST_EXCLUDE; 182 add = 0; 183 } else if (optname == MCAST_JOIN_SOURCE_GROUP) { 184 struct sockaddr_in6 *psin6; 185 int retv; 186 187 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group; 188 retv = ipv6_sock_mc_join_ssm(sk, greqs.gsr_interface, 189 &psin6->sin6_addr, 190 MCAST_INCLUDE); 191 /* prior join w/ different source is ok */ 192 if (retv && retv != -EADDRINUSE) 193 return retv; 194 omode = MCAST_INCLUDE; 195 add = 1; 196 } else /* MCAST_LEAVE_SOURCE_GROUP */ { 197 omode = MCAST_INCLUDE; 198 add = 0; 199 } 200 return ip6_mc_source(add, omode, sk, &greqs); 201} 202 203static int ipv6_set_mcast_msfilter(struct sock *sk, sockptr_t optval, 204 int optlen) 205{ 206 struct group_filter *gsf; 207 int ret; 208 209 if (optlen < GROUP_FILTER_SIZE(0)) 210 return -EINVAL; 211 if (optlen > READ_ONCE(sysctl_optmem_max)) 212 return -ENOBUFS; 213 214 gsf = memdup_sockptr(optval, optlen); 215 if (IS_ERR(gsf)) 216 return PTR_ERR(gsf); 217 218 /* numsrc >= (4G-140)/128 overflow in 32 bits */ 219 ret = -ENOBUFS; 220 if (gsf->gf_numsrc >= 0x1ffffffU || 221 gsf->gf_numsrc > sysctl_mld_max_msf) 222 goto out_free_gsf; 223 224 ret = -EINVAL; 225 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) 226 goto out_free_gsf; 227 228 ret = ip6_mc_msfilter(sk, gsf, gsf->gf_slist); 229out_free_gsf: 230 kfree(gsf); 231 return ret; 232} 233 234static int compat_ipv6_set_mcast_msfilter(struct sock *sk, sockptr_t optval, 235 int optlen) 236{ 237 const int size0 = offsetof(struct compat_group_filter, gf_slist); 238 struct compat_group_filter *gf32; 239 void *p; 240 int ret; 241 int n; 242 243 if (optlen < size0) 244 return -EINVAL; 245 if (optlen > READ_ONCE(sysctl_optmem_max) - 4) 246 return -ENOBUFS; 247 248 p = kmalloc(optlen + 4, GFP_KERNEL); 249 if (!p) 250 return -ENOMEM; 251 252 gf32 = p + 4; /* we want ->gf_group and ->gf_slist aligned */ 253 ret = -EFAULT; 254 if (copy_from_sockptr(gf32, optval, optlen)) 255 goto out_free_p; 256 257 /* numsrc >= (4G-140)/128 overflow in 32 bits */ 258 ret = -ENOBUFS; 259 n = gf32->gf_numsrc; 260 if (n >= 0x1ffffffU || n > sysctl_mld_max_msf) 261 goto out_free_p; 262 263 ret = -EINVAL; 264 if (offsetof(struct compat_group_filter, gf_slist[n]) > optlen) 265 goto out_free_p; 266 267 ret = ip6_mc_msfilter(sk, &(struct group_filter){ 268 .gf_interface = gf32->gf_interface, 269 .gf_group = gf32->gf_group, 270 .gf_fmode = gf32->gf_fmode, 271 .gf_numsrc = gf32->gf_numsrc}, gf32->gf_slist); 272 273out_free_p: 274 kfree(p); 275 return ret; 276} 277 278static int ipv6_mcast_join_leave(struct sock *sk, int optname, 279 sockptr_t optval, int optlen) 280{ 281 struct sockaddr_in6 *psin6; 282 struct group_req greq; 283 284 if (optlen < sizeof(greq)) 285 return -EINVAL; 286 if (copy_from_sockptr(&greq, optval, sizeof(greq))) 287 return -EFAULT; 288 289 if (greq.gr_group.ss_family != AF_INET6) 290 return -EADDRNOTAVAIL; 291 psin6 = (struct sockaddr_in6 *)&greq.gr_group; 292 if (optname == MCAST_JOIN_GROUP) 293 return ipv6_sock_mc_join(sk, greq.gr_interface, 294 &psin6->sin6_addr); 295 return ipv6_sock_mc_drop(sk, greq.gr_interface, &psin6->sin6_addr); 296} 297 298static int compat_ipv6_mcast_join_leave(struct sock *sk, int optname, 299 sockptr_t optval, int optlen) 300{ 301 struct compat_group_req gr32; 302 struct sockaddr_in6 *psin6; 303 304 if (optlen < sizeof(gr32)) 305 return -EINVAL; 306 if (copy_from_sockptr(&gr32, optval, sizeof(gr32))) 307 return -EFAULT; 308 309 if (gr32.gr_group.ss_family != AF_INET6) 310 return -EADDRNOTAVAIL; 311 psin6 = (struct sockaddr_in6 *)&gr32.gr_group; 312 if (optname == MCAST_JOIN_GROUP) 313 return ipv6_sock_mc_join(sk, gr32.gr_interface, 314 &psin6->sin6_addr); 315 return ipv6_sock_mc_drop(sk, gr32.gr_interface, &psin6->sin6_addr); 316} 317 318static int ipv6_set_opt_hdr(struct sock *sk, int optname, sockptr_t optval, 319 int optlen) 320{ 321 struct ipv6_pinfo *np = inet6_sk(sk); 322 struct ipv6_opt_hdr *new = NULL; 323 struct net *net = sock_net(sk); 324 struct ipv6_txoptions *opt; 325 int err; 326 327 /* hop-by-hop / destination options are privileged option */ 328 if (optname != IPV6_RTHDR && !ns_capable(net->user_ns, CAP_NET_RAW)) 329 return -EPERM; 330 331 /* remove any sticky options header with a zero option 332 * length, per RFC3542. 333 */ 334 if (optlen > 0) { 335 if (sockptr_is_null(optval)) 336 return -EINVAL; 337 if (optlen < sizeof(struct ipv6_opt_hdr) || 338 optlen & 0x7 || 339 optlen > 8 * 255) 340 return -EINVAL; 341 342 new = memdup_sockptr(optval, optlen); 343 if (IS_ERR(new)) 344 return PTR_ERR(new); 345 if (unlikely(ipv6_optlen(new) > optlen)) { 346 kfree(new); 347 return -EINVAL; 348 } 349 } 350 351 opt = rcu_dereference_protected(np->opt, lockdep_sock_is_held(sk)); 352 opt = ipv6_renew_options(sk, opt, optname, new); 353 kfree(new); 354 if (IS_ERR(opt)) 355 return PTR_ERR(opt); 356 357 /* routing header option needs extra check */ 358 err = -EINVAL; 359 if (optname == IPV6_RTHDR && opt && opt->srcrt) { 360 struct ipv6_rt_hdr *rthdr = opt->srcrt; 361 switch (rthdr->type) { 362#if IS_ENABLED(CONFIG_IPV6_MIP6) 363 case IPV6_SRCRT_TYPE_2: 364 if (rthdr->hdrlen != 2 || rthdr->segments_left != 1) 365 goto sticky_done; 366 break; 367#endif 368 case IPV6_SRCRT_TYPE_4: 369 { 370 struct ipv6_sr_hdr *srh = 371 (struct ipv6_sr_hdr *)opt->srcrt; 372 373 if (!seg6_validate_srh(srh, optlen, false)) 374 goto sticky_done; 375 break; 376 } 377 default: 378 goto sticky_done; 379 } 380 } 381 382 err = 0; 383 opt = ipv6_update_options(sk, opt); 384sticky_done: 385 if (opt) { 386 atomic_sub(opt->tot_len, &sk->sk_omem_alloc); 387 txopt_put(opt); 388 } 389 return err; 390} 391 392static int do_ipv6_setsockopt(struct sock *sk, int level, int optname, 393 sockptr_t optval, unsigned int optlen) 394{ 395 struct ipv6_pinfo *np = inet6_sk(sk); 396 struct net *net = sock_net(sk); 397 int val, valbool; 398 int retv = -ENOPROTOOPT; 399 bool needs_rtnl = setsockopt_needs_rtnl(optname); 400 401 if (sockptr_is_null(optval)) 402 val = 0; 403 else { 404 if (optlen >= sizeof(int)) { 405 if (copy_from_sockptr(&val, optval, sizeof(val))) 406 return -EFAULT; 407 } else 408 val = 0; 409 } 410 411 valbool = (val != 0); 412 413 if (ip6_mroute_opt(optname)) 414 return ip6_mroute_setsockopt(sk, optname, optval, optlen); 415 416 if (needs_rtnl) 417 rtnl_lock(); 418 lock_sock(sk); 419 420 /* Another thread has converted the socket into IPv4 with 421 * IPV6_ADDRFORM concurrently. 422 */ 423 if (unlikely(sk->sk_family != AF_INET6)) 424 goto unlock; 425 426 switch (optname) { 427 428 case IPV6_ADDRFORM: 429 if (optlen < sizeof(int)) 430 goto e_inval; 431 if (val == PF_INET) { 432 if (sk->sk_type == SOCK_RAW) 433 break; 434 435 if (sk->sk_protocol == IPPROTO_UDP || 436 sk->sk_protocol == IPPROTO_UDPLITE) { 437 struct udp_sock *up = udp_sk(sk); 438 if (up->pending == AF_INET6) { 439 retv = -EBUSY; 440 break; 441 } 442 } else if (sk->sk_protocol == IPPROTO_TCP) { 443 if (sk->sk_prot != &tcpv6_prot) { 444 retv = -EBUSY; 445 break; 446 } 447 } else { 448 break; 449 } 450 451 if (sk->sk_state != TCP_ESTABLISHED) { 452 retv = -ENOTCONN; 453 break; 454 } 455 456 if (ipv6_only_sock(sk) || 457 !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) { 458 retv = -EADDRNOTAVAIL; 459 break; 460 } 461 462 __ipv6_sock_mc_close(sk); 463 __ipv6_sock_ac_close(sk); 464 465 /* 466 * Sock is moving from IPv6 to IPv4 (sk_prot), so 467 * remove it from the refcnt debug socks count in the 468 * original family... 469 */ 470 sk_refcnt_debug_dec(sk); 471 472 if (sk->sk_protocol == IPPROTO_TCP) { 473 struct inet_connection_sock *icsk = inet_csk(sk); 474 local_bh_disable(); 475 sock_prot_inuse_add(net, sk->sk_prot, -1); 476 sock_prot_inuse_add(net, &tcp_prot, 1); 477 local_bh_enable(); 478 /* Paired with READ_ONCE(sk->sk_prot) in inet6_stream_ops */ 479 WRITE_ONCE(sk->sk_prot, &tcp_prot); 480 /* Paired with READ_ONCE() in tcp_(get|set)sockopt() */ 481 WRITE_ONCE(icsk->icsk_af_ops, &ipv4_specific); 482 sk->sk_socket->ops = &inet_stream_ops; 483 sk->sk_family = PF_INET; 484 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie); 485 } else { 486 struct proto *prot = &udp_prot; 487 488 if (sk->sk_protocol == IPPROTO_UDPLITE) 489 prot = &udplite_prot; 490 local_bh_disable(); 491 sock_prot_inuse_add(net, sk->sk_prot, -1); 492 sock_prot_inuse_add(net, prot, 1); 493 local_bh_enable(); 494 /* Paired with READ_ONCE(sk->sk_prot) in inet6_dgram_ops */ 495 WRITE_ONCE(sk->sk_prot, prot); 496 sk->sk_socket->ops = &inet_dgram_ops; 497 sk->sk_family = PF_INET; 498 } 499 500 /* Disable all options not to allocate memory anymore, 501 * but there is still a race. See the lockless path 502 * in udpv6_sendmsg() and ipv6_local_rxpmtu(). 503 */ 504 np->rxopt.all = 0; 505 506 inet6_cleanup_sock(sk); 507 508 /* 509 * ... and add it to the refcnt debug socks count 510 * in the new family. -acme 511 */ 512 sk_refcnt_debug_inc(sk); 513 module_put(THIS_MODULE); 514 retv = 0; 515 break; 516 } 517 goto e_inval; 518 519 case IPV6_V6ONLY: 520 if (optlen < sizeof(int) || 521 inet_sk(sk)->inet_num) 522 goto e_inval; 523 sk->sk_ipv6only = valbool; 524 retv = 0; 525 break; 526 527 case IPV6_RECVPKTINFO: 528 if (optlen < sizeof(int)) 529 goto e_inval; 530 np->rxopt.bits.rxinfo = valbool; 531 retv = 0; 532 break; 533 534 case IPV6_2292PKTINFO: 535 if (optlen < sizeof(int)) 536 goto e_inval; 537 np->rxopt.bits.rxoinfo = valbool; 538 retv = 0; 539 break; 540 541 case IPV6_RECVHOPLIMIT: 542 if (optlen < sizeof(int)) 543 goto e_inval; 544 np->rxopt.bits.rxhlim = valbool; 545 retv = 0; 546 break; 547 548 case IPV6_2292HOPLIMIT: 549 if (optlen < sizeof(int)) 550 goto e_inval; 551 np->rxopt.bits.rxohlim = valbool; 552 retv = 0; 553 break; 554 555 case IPV6_RECVRTHDR: 556 if (optlen < sizeof(int)) 557 goto e_inval; 558 np->rxopt.bits.srcrt = valbool; 559 retv = 0; 560 break; 561 562 case IPV6_2292RTHDR: 563 if (optlen < sizeof(int)) 564 goto e_inval; 565 np->rxopt.bits.osrcrt = valbool; 566 retv = 0; 567 break; 568 569 case IPV6_RECVHOPOPTS: 570 if (optlen < sizeof(int)) 571 goto e_inval; 572 np->rxopt.bits.hopopts = valbool; 573 retv = 0; 574 break; 575 576 case IPV6_2292HOPOPTS: 577 if (optlen < sizeof(int)) 578 goto e_inval; 579 np->rxopt.bits.ohopopts = valbool; 580 retv = 0; 581 break; 582 583 case IPV6_RECVDSTOPTS: 584 if (optlen < sizeof(int)) 585 goto e_inval; 586 np->rxopt.bits.dstopts = valbool; 587 retv = 0; 588 break; 589 590 case IPV6_2292DSTOPTS: 591 if (optlen < sizeof(int)) 592 goto e_inval; 593 np->rxopt.bits.odstopts = valbool; 594 retv = 0; 595 break; 596 597 case IPV6_TCLASS: 598 if (optlen < sizeof(int)) 599 goto e_inval; 600 if (val < -1 || val > 0xff) 601 goto e_inval; 602 /* RFC 3542, 6.5: default traffic class of 0x0 */ 603 if (val == -1) 604 val = 0; 605 np->tclass = val; 606 retv = 0; 607 break; 608 609 case IPV6_RECVTCLASS: 610 if (optlen < sizeof(int)) 611 goto e_inval; 612 np->rxopt.bits.rxtclass = valbool; 613 retv = 0; 614 break; 615 616 case IPV6_FLOWINFO: 617 if (optlen < sizeof(int)) 618 goto e_inval; 619 np->rxopt.bits.rxflow = valbool; 620 retv = 0; 621 break; 622 623 case IPV6_RECVPATHMTU: 624 if (optlen < sizeof(int)) 625 goto e_inval; 626 np->rxopt.bits.rxpmtu = valbool; 627 retv = 0; 628 break; 629 630 case IPV6_TRANSPARENT: 631 if (valbool && !ns_capable(net->user_ns, CAP_NET_RAW) && 632 !ns_capable(net->user_ns, CAP_NET_ADMIN)) { 633 retv = -EPERM; 634 break; 635 } 636 if (optlen < sizeof(int)) 637 goto e_inval; 638 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */ 639 inet_sk(sk)->transparent = valbool; 640 retv = 0; 641 break; 642 643 case IPV6_FREEBIND: 644 if (optlen < sizeof(int)) 645 goto e_inval; 646 /* we also don't have a separate freebind bit for IPV6 */ 647 inet_sk(sk)->freebind = valbool; 648 retv = 0; 649 break; 650 651 case IPV6_RECVORIGDSTADDR: 652 if (optlen < sizeof(int)) 653 goto e_inval; 654 np->rxopt.bits.rxorigdstaddr = valbool; 655 retv = 0; 656 break; 657 658 case IPV6_HOPOPTS: 659 case IPV6_RTHDRDSTOPTS: 660 case IPV6_RTHDR: 661 case IPV6_DSTOPTS: 662 retv = ipv6_set_opt_hdr(sk, optname, optval, optlen); 663 break; 664 665 case IPV6_PKTINFO: 666 { 667 struct in6_pktinfo pkt; 668 669 if (optlen == 0) 670 goto e_inval; 671 else if (optlen < sizeof(struct in6_pktinfo) || 672 sockptr_is_null(optval)) 673 goto e_inval; 674 675 if (copy_from_sockptr(&pkt, optval, sizeof(pkt))) { 676 retv = -EFAULT; 677 break; 678 } 679 if (!sk_dev_equal_l3scope(sk, pkt.ipi6_ifindex)) 680 goto e_inval; 681 682 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex; 683 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr; 684 retv = 0; 685 break; 686 } 687 688 case IPV6_2292PKTOPTIONS: 689 { 690 struct ipv6_txoptions *opt = NULL; 691 struct msghdr msg; 692 struct flowi6 fl6; 693 struct ipcm6_cookie ipc6; 694 695 memset(&fl6, 0, sizeof(fl6)); 696 fl6.flowi6_oif = sk->sk_bound_dev_if; 697 fl6.flowi6_mark = sk->sk_mark; 698 699 if (optlen == 0) 700 goto update; 701 702 /* 1K is probably excessive 703 * 1K is surely not enough, 2K per standard header is 16K. 704 */ 705 retv = -EINVAL; 706 if (optlen > 64*1024) 707 break; 708 709 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL); 710 retv = -ENOBUFS; 711 if (!opt) 712 break; 713 714 memset(opt, 0, sizeof(*opt)); 715 refcount_set(&opt->refcnt, 1); 716 opt->tot_len = sizeof(*opt) + optlen; 717 retv = -EFAULT; 718 if (copy_from_sockptr(opt + 1, optval, optlen)) 719 goto done; 720 721 msg.msg_controllen = optlen; 722 msg.msg_control = (void *)(opt+1); 723 ipc6.opt = opt; 724 725 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6); 726 if (retv) 727 goto done; 728update: 729 retv = 0; 730 opt = ipv6_update_options(sk, opt); 731done: 732 if (opt) { 733 atomic_sub(opt->tot_len, &sk->sk_omem_alloc); 734 txopt_put(opt); 735 } 736 break; 737 } 738 case IPV6_UNICAST_HOPS: 739 if (optlen < sizeof(int)) 740 goto e_inval; 741 if (val > 255 || val < -1) 742 goto e_inval; 743 np->hop_limit = val; 744 retv = 0; 745 break; 746 747 case IPV6_MULTICAST_HOPS: 748 if (sk->sk_type == SOCK_STREAM) 749 break; 750 if (optlen < sizeof(int)) 751 goto e_inval; 752 if (val > 255 || val < -1) 753 goto e_inval; 754 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val); 755 retv = 0; 756 break; 757 758 case IPV6_MULTICAST_LOOP: 759 if (optlen < sizeof(int)) 760 goto e_inval; 761 if (val != valbool) 762 goto e_inval; 763 np->mc_loop = valbool; 764 retv = 0; 765 break; 766 767 case IPV6_UNICAST_IF: 768 { 769 struct net_device *dev = NULL; 770 int ifindex; 771 772 if (optlen != sizeof(int)) 773 goto e_inval; 774 775 ifindex = (__force int)ntohl((__force __be32)val); 776 if (ifindex == 0) { 777 np->ucast_oif = 0; 778 retv = 0; 779 break; 780 } 781 782 dev = dev_get_by_index(net, ifindex); 783 retv = -EADDRNOTAVAIL; 784 if (!dev) 785 break; 786 dev_put(dev); 787 788 retv = -EINVAL; 789 if (sk->sk_bound_dev_if) 790 break; 791 792 np->ucast_oif = ifindex; 793 retv = 0; 794 break; 795 } 796 797 case IPV6_MULTICAST_IF: 798 if (sk->sk_type == SOCK_STREAM) 799 break; 800 if (optlen < sizeof(int)) 801 goto e_inval; 802 803 if (val) { 804 struct net_device *dev; 805 int midx; 806 807 rcu_read_lock(); 808 809 dev = dev_get_by_index_rcu(net, val); 810 if (!dev) { 811 rcu_read_unlock(); 812 retv = -ENODEV; 813 break; 814 } 815 midx = l3mdev_master_ifindex_rcu(dev); 816 817 rcu_read_unlock(); 818 819 if (sk->sk_bound_dev_if && 820 sk->sk_bound_dev_if != val && 821 (!midx || midx != sk->sk_bound_dev_if)) 822 goto e_inval; 823 } 824 np->mcast_oif = val; 825 retv = 0; 826 break; 827 case IPV6_ADD_MEMBERSHIP: 828 case IPV6_DROP_MEMBERSHIP: 829 { 830 struct ipv6_mreq mreq; 831 832 if (optlen < sizeof(struct ipv6_mreq)) 833 goto e_inval; 834 835 retv = -EPROTO; 836 if (inet_sk(sk)->is_icsk) 837 break; 838 839 retv = -EFAULT; 840 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq))) 841 break; 842 843 if (optname == IPV6_ADD_MEMBERSHIP) 844 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr); 845 else 846 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr); 847 break; 848 } 849 case IPV6_JOIN_ANYCAST: 850 case IPV6_LEAVE_ANYCAST: 851 { 852 struct ipv6_mreq mreq; 853 854 if (optlen < sizeof(struct ipv6_mreq)) 855 goto e_inval; 856 857 retv = -EFAULT; 858 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq))) 859 break; 860 861 if (optname == IPV6_JOIN_ANYCAST) 862 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr); 863 else 864 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr); 865 break; 866 } 867 case IPV6_MULTICAST_ALL: 868 if (optlen < sizeof(int)) 869 goto e_inval; 870 np->mc_all = valbool; 871 retv = 0; 872 break; 873 874 case MCAST_JOIN_GROUP: 875 case MCAST_LEAVE_GROUP: 876 if (in_compat_syscall()) 877 retv = compat_ipv6_mcast_join_leave(sk, optname, optval, 878 optlen); 879 else 880 retv = ipv6_mcast_join_leave(sk, optname, optval, 881 optlen); 882 break; 883 case MCAST_JOIN_SOURCE_GROUP: 884 case MCAST_LEAVE_SOURCE_GROUP: 885 case MCAST_BLOCK_SOURCE: 886 case MCAST_UNBLOCK_SOURCE: 887 retv = do_ipv6_mcast_group_source(sk, optname, optval, optlen); 888 break; 889 case MCAST_MSFILTER: 890 if (in_compat_syscall()) 891 retv = compat_ipv6_set_mcast_msfilter(sk, optval, 892 optlen); 893 else 894 retv = ipv6_set_mcast_msfilter(sk, optval, optlen); 895 break; 896 case IPV6_ROUTER_ALERT: 897 if (optlen < sizeof(int)) 898 goto e_inval; 899 retv = ip6_ra_control(sk, val); 900 break; 901 case IPV6_ROUTER_ALERT_ISOLATE: 902 if (optlen < sizeof(int)) 903 goto e_inval; 904 np->rtalert_isolate = valbool; 905 retv = 0; 906 break; 907 case IPV6_MTU_DISCOVER: 908 if (optlen < sizeof(int)) 909 goto e_inval; 910 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT) 911 goto e_inval; 912 np->pmtudisc = val; 913 retv = 0; 914 break; 915 case IPV6_MTU: 916 if (optlen < sizeof(int)) 917 goto e_inval; 918 if (val && val < IPV6_MIN_MTU) 919 goto e_inval; 920 np->frag_size = val; 921 retv = 0; 922 break; 923 case IPV6_RECVERR: 924 if (optlen < sizeof(int)) 925 goto e_inval; 926 np->recverr = valbool; 927 if (!val) 928 skb_queue_purge(&sk->sk_error_queue); 929 retv = 0; 930 break; 931 case IPV6_FLOWINFO_SEND: 932 if (optlen < sizeof(int)) 933 goto e_inval; 934 np->sndflow = valbool; 935 retv = 0; 936 break; 937 case IPV6_FLOWLABEL_MGR: 938 retv = ipv6_flowlabel_opt(sk, optval, optlen); 939 break; 940 case IPV6_IPSEC_POLICY: 941 case IPV6_XFRM_POLICY: 942 retv = -EPERM; 943 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 944 break; 945 retv = xfrm_user_policy(sk, optname, optval, optlen); 946 break; 947 948 case IPV6_ADDR_PREFERENCES: 949 if (optlen < sizeof(int)) 950 goto e_inval; 951 retv = __ip6_sock_set_addr_preferences(sk, val); 952 break; 953 case IPV6_MINHOPCOUNT: 954 if (optlen < sizeof(int)) 955 goto e_inval; 956 if (val < 0 || val > 255) 957 goto e_inval; 958 np->min_hopcount = val; 959 retv = 0; 960 break; 961 case IPV6_DONTFRAG: 962 np->dontfrag = valbool; 963 retv = 0; 964 break; 965 case IPV6_AUTOFLOWLABEL: 966 np->autoflowlabel = valbool; 967 np->autoflowlabel_set = 1; 968 retv = 0; 969 break; 970 case IPV6_RECVFRAGSIZE: 971 np->rxopt.bits.recvfragsize = valbool; 972 retv = 0; 973 break; 974 case IPV6_RECVERR_RFC4884: 975 if (optlen < sizeof(int)) 976 goto e_inval; 977 if (val < 0 || val > 1) 978 goto e_inval; 979 np->recverr_rfc4884 = valbool; 980 retv = 0; 981 break; 982 } 983 984unlock: 985 release_sock(sk); 986 if (needs_rtnl) 987 rtnl_unlock(); 988 989 return retv; 990 991e_inval: 992 release_sock(sk); 993 if (needs_rtnl) 994 rtnl_unlock(); 995 return -EINVAL; 996} 997 998int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, 999 unsigned int optlen) 1000{ 1001 int err; 1002 1003 if (level == SOL_IP && sk->sk_type != SOCK_RAW) 1004 return udp_prot.setsockopt(sk, level, optname, optval, optlen); 1005 1006 if (level != SOL_IPV6) 1007 return -ENOPROTOOPT; 1008 1009 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen); 1010#ifdef CONFIG_NETFILTER 1011 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1012 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY && 1013 optname != IPV6_XFRM_POLICY) 1014 err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen); 1015#endif 1016 return err; 1017} 1018EXPORT_SYMBOL(ipv6_setsockopt); 1019 1020static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt, 1021 int optname, char __user *optval, int len) 1022{ 1023 struct ipv6_opt_hdr *hdr; 1024 1025 if (!opt) 1026 return 0; 1027 1028 switch (optname) { 1029 case IPV6_HOPOPTS: 1030 hdr = opt->hopopt; 1031 break; 1032 case IPV6_RTHDRDSTOPTS: 1033 hdr = opt->dst0opt; 1034 break; 1035 case IPV6_RTHDR: 1036 hdr = (struct ipv6_opt_hdr *)opt->srcrt; 1037 break; 1038 case IPV6_DSTOPTS: 1039 hdr = opt->dst1opt; 1040 break; 1041 default: 1042 return -EINVAL; /* should not happen */ 1043 } 1044 1045 if (!hdr) 1046 return 0; 1047 1048 len = min_t(unsigned int, len, ipv6_optlen(hdr)); 1049 if (copy_to_user(optval, hdr, len)) 1050 return -EFAULT; 1051 return len; 1052} 1053 1054static int ipv6_get_msfilter(struct sock *sk, void __user *optval, 1055 int __user *optlen, int len) 1056{ 1057 const int size0 = offsetof(struct group_filter, gf_slist); 1058 struct group_filter __user *p = optval; 1059 struct group_filter gsf; 1060 int num; 1061 int err; 1062 1063 if (len < size0) 1064 return -EINVAL; 1065 if (copy_from_user(&gsf, p, size0)) 1066 return -EFAULT; 1067 if (gsf.gf_group.ss_family != AF_INET6) 1068 return -EADDRNOTAVAIL; 1069 num = gsf.gf_numsrc; 1070 lock_sock(sk); 1071 err = ip6_mc_msfget(sk, &gsf, p->gf_slist); 1072 if (!err) { 1073 if (num > gsf.gf_numsrc) 1074 num = gsf.gf_numsrc; 1075 if (put_user(GROUP_FILTER_SIZE(num), optlen) || 1076 copy_to_user(p, &gsf, size0)) 1077 err = -EFAULT; 1078 } 1079 release_sock(sk); 1080 return err; 1081} 1082 1083static int compat_ipv6_get_msfilter(struct sock *sk, void __user *optval, 1084 int __user *optlen) 1085{ 1086 const int size0 = offsetof(struct compat_group_filter, gf_slist); 1087 struct compat_group_filter __user *p = optval; 1088 struct compat_group_filter gf32; 1089 struct group_filter gf; 1090 int len, err; 1091 int num; 1092 1093 if (get_user(len, optlen)) 1094 return -EFAULT; 1095 if (len < size0) 1096 return -EINVAL; 1097 1098 if (copy_from_user(&gf32, p, size0)) 1099 return -EFAULT; 1100 gf.gf_interface = gf32.gf_interface; 1101 gf.gf_fmode = gf32.gf_fmode; 1102 num = gf.gf_numsrc = gf32.gf_numsrc; 1103 gf.gf_group = gf32.gf_group; 1104 1105 if (gf.gf_group.ss_family != AF_INET6) 1106 return -EADDRNOTAVAIL; 1107 1108 lock_sock(sk); 1109 err = ip6_mc_msfget(sk, &gf, p->gf_slist); 1110 release_sock(sk); 1111 if (err) 1112 return err; 1113 if (num > gf.gf_numsrc) 1114 num = gf.gf_numsrc; 1115 len = GROUP_FILTER_SIZE(num) - (sizeof(gf)-sizeof(gf32)); 1116 if (put_user(len, optlen) || 1117 put_user(gf.gf_fmode, &p->gf_fmode) || 1118 put_user(gf.gf_numsrc, &p->gf_numsrc)) 1119 return -EFAULT; 1120 return 0; 1121} 1122 1123static int do_ipv6_getsockopt(struct sock *sk, int level, int optname, 1124 char __user *optval, int __user *optlen, unsigned int flags) 1125{ 1126 struct ipv6_pinfo *np = inet6_sk(sk); 1127 int len; 1128 int val; 1129 1130 if (ip6_mroute_opt(optname)) 1131 return ip6_mroute_getsockopt(sk, optname, optval, optlen); 1132 1133 if (get_user(len, optlen)) 1134 return -EFAULT; 1135 switch (optname) { 1136 case IPV6_ADDRFORM: 1137 if (sk->sk_protocol != IPPROTO_UDP && 1138 sk->sk_protocol != IPPROTO_UDPLITE && 1139 sk->sk_protocol != IPPROTO_TCP) 1140 return -ENOPROTOOPT; 1141 if (sk->sk_state != TCP_ESTABLISHED) 1142 return -ENOTCONN; 1143 val = sk->sk_family; 1144 break; 1145 case MCAST_MSFILTER: 1146 if (in_compat_syscall()) 1147 return compat_ipv6_get_msfilter(sk, optval, optlen); 1148 return ipv6_get_msfilter(sk, optval, optlen, len); 1149 case IPV6_2292PKTOPTIONS: 1150 { 1151 struct msghdr msg; 1152 struct sk_buff *skb; 1153 1154 if (sk->sk_type != SOCK_STREAM) 1155 return -ENOPROTOOPT; 1156 1157 msg.msg_control = optval; 1158 msg.msg_controllen = len; 1159 msg.msg_flags = flags; 1160 msg.msg_control_is_user = true; 1161 1162 lock_sock(sk); 1163 skb = np->pktoptions; 1164 if (skb) 1165 ip6_datagram_recv_ctl(sk, &msg, skb); 1166 release_sock(sk); 1167 if (!skb) { 1168 if (np->rxopt.bits.rxinfo) { 1169 struct in6_pktinfo src_info; 1170 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif : 1171 np->sticky_pktinfo.ipi6_ifindex; 1172 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr; 1173 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info); 1174 } 1175 if (np->rxopt.bits.rxhlim) { 1176 int hlim = np->mcast_hops; 1177 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); 1178 } 1179 if (np->rxopt.bits.rxtclass) { 1180 int tclass = (int)ip6_tclass(np->rcv_flowinfo); 1181 1182 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass); 1183 } 1184 if (np->rxopt.bits.rxoinfo) { 1185 struct in6_pktinfo src_info; 1186 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif : 1187 np->sticky_pktinfo.ipi6_ifindex; 1188 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : 1189 np->sticky_pktinfo.ipi6_addr; 1190 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); 1191 } 1192 if (np->rxopt.bits.rxohlim) { 1193 int hlim = np->mcast_hops; 1194 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); 1195 } 1196 if (np->rxopt.bits.rxflow) { 1197 __be32 flowinfo = np->rcv_flowinfo; 1198 1199 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo); 1200 } 1201 } 1202 len -= msg.msg_controllen; 1203 return put_user(len, optlen); 1204 } 1205 case IPV6_MTU: 1206 { 1207 struct dst_entry *dst; 1208 1209 val = 0; 1210 rcu_read_lock(); 1211 dst = __sk_dst_get(sk); 1212 if (dst) 1213 val = dst_mtu(dst); 1214 rcu_read_unlock(); 1215 if (!val) 1216 return -ENOTCONN; 1217 break; 1218 } 1219 1220 case IPV6_V6ONLY: 1221 val = sk->sk_ipv6only; 1222 break; 1223 1224 case IPV6_RECVPKTINFO: 1225 val = np->rxopt.bits.rxinfo; 1226 break; 1227 1228 case IPV6_2292PKTINFO: 1229 val = np->rxopt.bits.rxoinfo; 1230 break; 1231 1232 case IPV6_RECVHOPLIMIT: 1233 val = np->rxopt.bits.rxhlim; 1234 break; 1235 1236 case IPV6_2292HOPLIMIT: 1237 val = np->rxopt.bits.rxohlim; 1238 break; 1239 1240 case IPV6_RECVRTHDR: 1241 val = np->rxopt.bits.srcrt; 1242 break; 1243 1244 case IPV6_2292RTHDR: 1245 val = np->rxopt.bits.osrcrt; 1246 break; 1247 1248 case IPV6_HOPOPTS: 1249 case IPV6_RTHDRDSTOPTS: 1250 case IPV6_RTHDR: 1251 case IPV6_DSTOPTS: 1252 { 1253 struct ipv6_txoptions *opt; 1254 1255 lock_sock(sk); 1256 opt = rcu_dereference_protected(np->opt, 1257 lockdep_sock_is_held(sk)); 1258 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len); 1259 release_sock(sk); 1260 /* check if ipv6_getsockopt_sticky() returns err code */ 1261 if (len < 0) 1262 return len; 1263 return put_user(len, optlen); 1264 } 1265 1266 case IPV6_RECVHOPOPTS: 1267 val = np->rxopt.bits.hopopts; 1268 break; 1269 1270 case IPV6_2292HOPOPTS: 1271 val = np->rxopt.bits.ohopopts; 1272 break; 1273 1274 case IPV6_RECVDSTOPTS: 1275 val = np->rxopt.bits.dstopts; 1276 break; 1277 1278 case IPV6_2292DSTOPTS: 1279 val = np->rxopt.bits.odstopts; 1280 break; 1281 1282 case IPV6_TCLASS: 1283 val = np->tclass; 1284 break; 1285 1286 case IPV6_RECVTCLASS: 1287 val = np->rxopt.bits.rxtclass; 1288 break; 1289 1290 case IPV6_FLOWINFO: 1291 val = np->rxopt.bits.rxflow; 1292 break; 1293 1294 case IPV6_RECVPATHMTU: 1295 val = np->rxopt.bits.rxpmtu; 1296 break; 1297 1298 case IPV6_PATHMTU: 1299 { 1300 struct dst_entry *dst; 1301 struct ip6_mtuinfo mtuinfo; 1302 1303 if (len < sizeof(mtuinfo)) 1304 return -EINVAL; 1305 1306 len = sizeof(mtuinfo); 1307 memset(&mtuinfo, 0, sizeof(mtuinfo)); 1308 1309 rcu_read_lock(); 1310 dst = __sk_dst_get(sk); 1311 if (dst) 1312 mtuinfo.ip6m_mtu = dst_mtu(dst); 1313 rcu_read_unlock(); 1314 if (!mtuinfo.ip6m_mtu) 1315 return -ENOTCONN; 1316 1317 if (put_user(len, optlen)) 1318 return -EFAULT; 1319 if (copy_to_user(optval, &mtuinfo, len)) 1320 return -EFAULT; 1321 1322 return 0; 1323 } 1324 1325 case IPV6_TRANSPARENT: 1326 val = inet_sk(sk)->transparent; 1327 break; 1328 1329 case IPV6_FREEBIND: 1330 val = inet_sk(sk)->freebind; 1331 break; 1332 1333 case IPV6_RECVORIGDSTADDR: 1334 val = np->rxopt.bits.rxorigdstaddr; 1335 break; 1336 1337 case IPV6_UNICAST_HOPS: 1338 case IPV6_MULTICAST_HOPS: 1339 { 1340 struct dst_entry *dst; 1341 1342 if (optname == IPV6_UNICAST_HOPS) 1343 val = np->hop_limit; 1344 else 1345 val = np->mcast_hops; 1346 1347 if (val < 0) { 1348 rcu_read_lock(); 1349 dst = __sk_dst_get(sk); 1350 if (dst) 1351 val = ip6_dst_hoplimit(dst); 1352 rcu_read_unlock(); 1353 } 1354 1355 if (val < 0) 1356 val = sock_net(sk)->ipv6.devconf_all->hop_limit; 1357 break; 1358 } 1359 1360 case IPV6_MULTICAST_LOOP: 1361 val = np->mc_loop; 1362 break; 1363 1364 case IPV6_MULTICAST_IF: 1365 val = np->mcast_oif; 1366 break; 1367 1368 case IPV6_MULTICAST_ALL: 1369 val = np->mc_all; 1370 break; 1371 1372 case IPV6_UNICAST_IF: 1373 val = (__force int)htonl((__u32) np->ucast_oif); 1374 break; 1375 1376 case IPV6_MTU_DISCOVER: 1377 val = np->pmtudisc; 1378 break; 1379 1380 case IPV6_RECVERR: 1381 val = np->recverr; 1382 break; 1383 1384 case IPV6_FLOWINFO_SEND: 1385 val = np->sndflow; 1386 break; 1387 1388 case IPV6_FLOWLABEL_MGR: 1389 { 1390 struct in6_flowlabel_req freq; 1391 int flags; 1392 1393 if (len < sizeof(freq)) 1394 return -EINVAL; 1395 1396 if (copy_from_user(&freq, optval, sizeof(freq))) 1397 return -EFAULT; 1398 1399 if (freq.flr_action != IPV6_FL_A_GET) 1400 return -EINVAL; 1401 1402 len = sizeof(freq); 1403 flags = freq.flr_flags; 1404 1405 memset(&freq, 0, sizeof(freq)); 1406 1407 val = ipv6_flowlabel_opt_get(sk, &freq, flags); 1408 if (val < 0) 1409 return val; 1410 1411 if (put_user(len, optlen)) 1412 return -EFAULT; 1413 if (copy_to_user(optval, &freq, len)) 1414 return -EFAULT; 1415 1416 return 0; 1417 } 1418 1419 case IPV6_ADDR_PREFERENCES: 1420 val = 0; 1421 1422 if (np->srcprefs & IPV6_PREFER_SRC_TMP) 1423 val |= IPV6_PREFER_SRC_TMP; 1424 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC) 1425 val |= IPV6_PREFER_SRC_PUBLIC; 1426 else { 1427 /* XXX: should we return system default? */ 1428 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT; 1429 } 1430 1431 if (np->srcprefs & IPV6_PREFER_SRC_COA) 1432 val |= IPV6_PREFER_SRC_COA; 1433 else 1434 val |= IPV6_PREFER_SRC_HOME; 1435 break; 1436 1437 case IPV6_MINHOPCOUNT: 1438 val = np->min_hopcount; 1439 break; 1440 1441 case IPV6_DONTFRAG: 1442 val = np->dontfrag; 1443 break; 1444 1445 case IPV6_AUTOFLOWLABEL: 1446 val = ip6_autoflowlabel(sock_net(sk), np); 1447 break; 1448 1449 case IPV6_RECVFRAGSIZE: 1450 val = np->rxopt.bits.recvfragsize; 1451 break; 1452 1453 case IPV6_ROUTER_ALERT_ISOLATE: 1454 val = np->rtalert_isolate; 1455 break; 1456 1457 case IPV6_RECVERR_RFC4884: 1458 val = np->recverr_rfc4884; 1459 break; 1460 1461 default: 1462 return -ENOPROTOOPT; 1463 } 1464 len = min_t(unsigned int, sizeof(int), len); 1465 if (put_user(len, optlen)) 1466 return -EFAULT; 1467 if (copy_to_user(optval, &val, len)) 1468 return -EFAULT; 1469 return 0; 1470} 1471 1472int ipv6_getsockopt(struct sock *sk, int level, int optname, 1473 char __user *optval, int __user *optlen) 1474{ 1475 int err; 1476 1477 if (level == SOL_IP && sk->sk_type != SOCK_RAW) 1478 return udp_prot.getsockopt(sk, level, optname, optval, optlen); 1479 1480 if (level != SOL_IPV6) 1481 return -ENOPROTOOPT; 1482 1483 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0); 1484#ifdef CONFIG_NETFILTER 1485 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1486 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) { 1487 int len; 1488 1489 if (get_user(len, optlen)) 1490 return -EFAULT; 1491 1492 err = nf_getsockopt(sk, PF_INET6, optname, optval, &len); 1493 if (err >= 0) 1494 err = put_user(len, optlen); 1495 } 1496#endif 1497 return err; 1498} 1499EXPORT_SYMBOL(ipv6_getsockopt); 1500