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 55 struct ip6_ra_chain *ip6_ra_chain; 56 DEFINE_RWLOCK(ip6_ra_lock); 57 58 int 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 } 99 100 struct 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 } 118 119 static 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 } 138 139 static 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 } 161 162 static 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 } 202 203 static 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 > 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); 229 out_free_gsf: 230 kfree(gsf); 231 return ret; 232 } 233 234 static 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 > 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); 272 273 out_free_p: 274 kfree(p); 275 return ret; 276 } 277 278 static 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 } 297 298 static 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 } 317 318 static 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); 384 sticky_done: 385 if (opt) { 386 atomic_sub(opt->tot_len, &sk->sk_omem_alloc); 387 txopt_put(opt); 388 } 389 return err; 390 } 391 392 static 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 switch (optname) { 421 422 case IPV6_ADDRFORM: 423 if (optlen < sizeof(int)) 424 goto e_inval; 425 if (val == PF_INET) { 426 struct ipv6_txoptions *opt; 427 struct sk_buff *pktopt; 428 429 if (sk->sk_type == SOCK_RAW) 430 break; 431 432 if (sk->sk_protocol == IPPROTO_UDP || 433 sk->sk_protocol == IPPROTO_UDPLITE) { 434 struct udp_sock *up = udp_sk(sk); 435 if (up->pending == AF_INET6) { 436 retv = -EBUSY; 437 break; 438 } 439 } else if (sk->sk_protocol == IPPROTO_TCP) { 440 if (sk->sk_prot != &tcpv6_prot) { 441 retv = -EBUSY; 442 break; 443 } 444 } else { 445 break; 446 } 447 448 if (sk->sk_state != TCP_ESTABLISHED) { 449 retv = -ENOTCONN; 450 break; 451 } 452 453 if (ipv6_only_sock(sk) || 454 !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) { 455 retv = -EADDRNOTAVAIL; 456 break; 457 } 458 459 fl6_free_socklist(sk); 460 __ipv6_sock_mc_close(sk); 461 462 /* 463 * Sock is moving from IPv6 to IPv4 (sk_prot), so 464 * remove it from the refcnt debug socks count in the 465 * original family... 466 */ 467 sk_refcnt_debug_dec(sk); 468 469 if (sk->sk_protocol == IPPROTO_TCP) { 470 struct inet_connection_sock *icsk = inet_csk(sk); 471 local_bh_disable(); 472 sock_prot_inuse_add(net, sk->sk_prot, -1); 473 sock_prot_inuse_add(net, &tcp_prot, 1); 474 local_bh_enable(); 475 sk->sk_prot = &tcp_prot; 476 icsk->icsk_af_ops = &ipv4_specific; 477 sk->sk_socket->ops = &inet_stream_ops; 478 sk->sk_family = PF_INET; 479 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie); 480 } else { 481 struct proto *prot = &udp_prot; 482 483 if (sk->sk_protocol == IPPROTO_UDPLITE) 484 prot = &udplite_prot; 485 local_bh_disable(); 486 sock_prot_inuse_add(net, sk->sk_prot, -1); 487 sock_prot_inuse_add(net, prot, 1); 488 local_bh_enable(); 489 sk->sk_prot = prot; 490 sk->sk_socket->ops = &inet_dgram_ops; 491 sk->sk_family = PF_INET; 492 } 493 opt = xchg((__force struct ipv6_txoptions **)&np->opt, 494 NULL); 495 if (opt) { 496 atomic_sub(opt->tot_len, &sk->sk_omem_alloc); 497 txopt_put(opt); 498 } 499 pktopt = xchg(&np->pktoptions, NULL); 500 kfree_skb(pktopt); 501 502 /* 503 * ... and add it to the refcnt debug socks count 504 * in the new family. -acme 505 */ 506 sk_refcnt_debug_inc(sk); 507 module_put(THIS_MODULE); 508 retv = 0; 509 break; 510 } 511 goto e_inval; 512 513 case IPV6_V6ONLY: 514 if (optlen < sizeof(int) || 515 inet_sk(sk)->inet_num) 516 goto e_inval; 517 sk->sk_ipv6only = valbool; 518 retv = 0; 519 break; 520 521 case IPV6_RECVPKTINFO: 522 if (optlen < sizeof(int)) 523 goto e_inval; 524 np->rxopt.bits.rxinfo = valbool; 525 retv = 0; 526 break; 527 528 case IPV6_2292PKTINFO: 529 if (optlen < sizeof(int)) 530 goto e_inval; 531 np->rxopt.bits.rxoinfo = valbool; 532 retv = 0; 533 break; 534 535 case IPV6_RECVHOPLIMIT: 536 if (optlen < sizeof(int)) 537 goto e_inval; 538 np->rxopt.bits.rxhlim = valbool; 539 retv = 0; 540 break; 541 542 case IPV6_2292HOPLIMIT: 543 if (optlen < sizeof(int)) 544 goto e_inval; 545 np->rxopt.bits.rxohlim = valbool; 546 retv = 0; 547 break; 548 549 case IPV6_RECVRTHDR: 550 if (optlen < sizeof(int)) 551 goto e_inval; 552 np->rxopt.bits.srcrt = valbool; 553 retv = 0; 554 break; 555 556 case IPV6_2292RTHDR: 557 if (optlen < sizeof(int)) 558 goto e_inval; 559 np->rxopt.bits.osrcrt = valbool; 560 retv = 0; 561 break; 562 563 case IPV6_RECVHOPOPTS: 564 if (optlen < sizeof(int)) 565 goto e_inval; 566 np->rxopt.bits.hopopts = valbool; 567 retv = 0; 568 break; 569 570 case IPV6_2292HOPOPTS: 571 if (optlen < sizeof(int)) 572 goto e_inval; 573 np->rxopt.bits.ohopopts = valbool; 574 retv = 0; 575 break; 576 577 case IPV6_RECVDSTOPTS: 578 if (optlen < sizeof(int)) 579 goto e_inval; 580 np->rxopt.bits.dstopts = valbool; 581 retv = 0; 582 break; 583 584 case IPV6_2292DSTOPTS: 585 if (optlen < sizeof(int)) 586 goto e_inval; 587 np->rxopt.bits.odstopts = valbool; 588 retv = 0; 589 break; 590 591 case IPV6_TCLASS: 592 if (optlen < sizeof(int)) 593 goto e_inval; 594 if (val < -1 || val > 0xff) 595 goto e_inval; 596 /* RFC 3542, 6.5: default traffic class of 0x0 */ 597 if (val == -1) 598 val = 0; 599 np->tclass = val; 600 retv = 0; 601 break; 602 603 case IPV6_RECVTCLASS: 604 if (optlen < sizeof(int)) 605 goto e_inval; 606 np->rxopt.bits.rxtclass = valbool; 607 retv = 0; 608 break; 609 610 case IPV6_FLOWINFO: 611 if (optlen < sizeof(int)) 612 goto e_inval; 613 np->rxopt.bits.rxflow = valbool; 614 retv = 0; 615 break; 616 617 case IPV6_RECVPATHMTU: 618 if (optlen < sizeof(int)) 619 goto e_inval; 620 np->rxopt.bits.rxpmtu = valbool; 621 retv = 0; 622 break; 623 624 case IPV6_TRANSPARENT: 625 if (valbool && !ns_capable(net->user_ns, CAP_NET_RAW) && 626 !ns_capable(net->user_ns, CAP_NET_ADMIN)) { 627 retv = -EPERM; 628 break; 629 } 630 if (optlen < sizeof(int)) 631 goto e_inval; 632 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */ 633 inet_sk(sk)->transparent = valbool; 634 retv = 0; 635 break; 636 637 case IPV6_FREEBIND: 638 if (optlen < sizeof(int)) 639 goto e_inval; 640 /* we also don't have a separate freebind bit for IPV6 */ 641 inet_sk(sk)->freebind = valbool; 642 retv = 0; 643 break; 644 645 case IPV6_RECVORIGDSTADDR: 646 if (optlen < sizeof(int)) 647 goto e_inval; 648 np->rxopt.bits.rxorigdstaddr = valbool; 649 retv = 0; 650 break; 651 652 case IPV6_HOPOPTS: 653 case IPV6_RTHDRDSTOPTS: 654 case IPV6_RTHDR: 655 case IPV6_DSTOPTS: 656 retv = ipv6_set_opt_hdr(sk, optname, optval, optlen); 657 break; 658 659 case IPV6_PKTINFO: 660 { 661 struct in6_pktinfo pkt; 662 663 if (optlen == 0) 664 goto e_inval; 665 else if (optlen < sizeof(struct in6_pktinfo) || 666 sockptr_is_null(optval)) 667 goto e_inval; 668 669 if (copy_from_sockptr(&pkt, optval, sizeof(pkt))) { 670 retv = -EFAULT; 671 break; 672 } 673 if (!sk_dev_equal_l3scope(sk, pkt.ipi6_ifindex)) 674 goto e_inval; 675 676 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex; 677 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr; 678 retv = 0; 679 break; 680 } 681 682 case IPV6_2292PKTOPTIONS: 683 { 684 struct ipv6_txoptions *opt = NULL; 685 struct msghdr msg; 686 struct flowi6 fl6; 687 struct ipcm6_cookie ipc6; 688 689 memset(&fl6, 0, sizeof(fl6)); 690 fl6.flowi6_oif = sk->sk_bound_dev_if; 691 fl6.flowi6_mark = sk->sk_mark; 692 693 if (optlen == 0) 694 goto update; 695 696 /* 1K is probably excessive 697 * 1K is surely not enough, 2K per standard header is 16K. 698 */ 699 retv = -EINVAL; 700 if (optlen > 64*1024) 701 break; 702 703 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL); 704 retv = -ENOBUFS; 705 if (!opt) 706 break; 707 708 memset(opt, 0, sizeof(*opt)); 709 refcount_set(&opt->refcnt, 1); 710 opt->tot_len = sizeof(*opt) + optlen; 711 retv = -EFAULT; 712 if (copy_from_sockptr(opt + 1, optval, optlen)) 713 goto done; 714 715 msg.msg_controllen = optlen; 716 msg.msg_control = (void *)(opt+1); 717 ipc6.opt = opt; 718 719 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6); 720 if (retv) 721 goto done; 722 update: 723 retv = 0; 724 opt = ipv6_update_options(sk, opt); 725 done: 726 if (opt) { 727 atomic_sub(opt->tot_len, &sk->sk_omem_alloc); 728 txopt_put(opt); 729 } 730 break; 731 } 732 case IPV6_UNICAST_HOPS: 733 if (optlen < sizeof(int)) 734 goto e_inval; 735 if (val > 255 || val < -1) 736 goto e_inval; 737 np->hop_limit = val; 738 retv = 0; 739 break; 740 741 case IPV6_MULTICAST_HOPS: 742 if (sk->sk_type == SOCK_STREAM) 743 break; 744 if (optlen < sizeof(int)) 745 goto e_inval; 746 if (val > 255 || val < -1) 747 goto e_inval; 748 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val); 749 retv = 0; 750 break; 751 752 case IPV6_MULTICAST_LOOP: 753 if (optlen < sizeof(int)) 754 goto e_inval; 755 if (val != valbool) 756 goto e_inval; 757 np->mc_loop = valbool; 758 retv = 0; 759 break; 760 761 case IPV6_UNICAST_IF: 762 { 763 struct net_device *dev = NULL; 764 int ifindex; 765 766 if (optlen != sizeof(int)) 767 goto e_inval; 768 769 ifindex = (__force int)ntohl((__force __be32)val); 770 if (ifindex == 0) { 771 np->ucast_oif = 0; 772 retv = 0; 773 break; 774 } 775 776 dev = dev_get_by_index(net, ifindex); 777 retv = -EADDRNOTAVAIL; 778 if (!dev) 779 break; 780 dev_put(dev); 781 782 retv = -EINVAL; 783 if (sk->sk_bound_dev_if) 784 break; 785 786 np->ucast_oif = ifindex; 787 retv = 0; 788 break; 789 } 790 791 case IPV6_MULTICAST_IF: 792 if (sk->sk_type == SOCK_STREAM) 793 break; 794 if (optlen < sizeof(int)) 795 goto e_inval; 796 797 if (val) { 798 struct net_device *dev; 799 int midx; 800 801 rcu_read_lock(); 802 803 dev = dev_get_by_index_rcu(net, val); 804 if (!dev) { 805 rcu_read_unlock(); 806 retv = -ENODEV; 807 break; 808 } 809 midx = l3mdev_master_ifindex_rcu(dev); 810 811 rcu_read_unlock(); 812 813 if (sk->sk_bound_dev_if && 814 sk->sk_bound_dev_if != val && 815 (!midx || midx != sk->sk_bound_dev_if)) 816 goto e_inval; 817 } 818 np->mcast_oif = val; 819 retv = 0; 820 break; 821 case IPV6_ADD_MEMBERSHIP: 822 case IPV6_DROP_MEMBERSHIP: 823 { 824 struct ipv6_mreq mreq; 825 826 if (optlen < sizeof(struct ipv6_mreq)) 827 goto e_inval; 828 829 retv = -EPROTO; 830 if (inet_sk(sk)->is_icsk) 831 break; 832 833 retv = -EFAULT; 834 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq))) 835 break; 836 837 if (optname == IPV6_ADD_MEMBERSHIP) 838 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr); 839 else 840 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr); 841 break; 842 } 843 case IPV6_JOIN_ANYCAST: 844 case IPV6_LEAVE_ANYCAST: 845 { 846 struct ipv6_mreq mreq; 847 848 if (optlen < sizeof(struct ipv6_mreq)) 849 goto e_inval; 850 851 retv = -EFAULT; 852 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq))) 853 break; 854 855 if (optname == IPV6_JOIN_ANYCAST) 856 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr); 857 else 858 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr); 859 break; 860 } 861 case IPV6_MULTICAST_ALL: 862 if (optlen < sizeof(int)) 863 goto e_inval; 864 np->mc_all = valbool; 865 retv = 0; 866 break; 867 868 case MCAST_JOIN_GROUP: 869 case MCAST_LEAVE_GROUP: 870 if (in_compat_syscall()) 871 retv = compat_ipv6_mcast_join_leave(sk, optname, optval, 872 optlen); 873 else 874 retv = ipv6_mcast_join_leave(sk, optname, optval, 875 optlen); 876 break; 877 case MCAST_JOIN_SOURCE_GROUP: 878 case MCAST_LEAVE_SOURCE_GROUP: 879 case MCAST_BLOCK_SOURCE: 880 case MCAST_UNBLOCK_SOURCE: 881 retv = do_ipv6_mcast_group_source(sk, optname, optval, optlen); 882 break; 883 case MCAST_MSFILTER: 884 if (in_compat_syscall()) 885 retv = compat_ipv6_set_mcast_msfilter(sk, optval, 886 optlen); 887 else 888 retv = ipv6_set_mcast_msfilter(sk, optval, optlen); 889 break; 890 case IPV6_ROUTER_ALERT: 891 if (optlen < sizeof(int)) 892 goto e_inval; 893 retv = ip6_ra_control(sk, val); 894 break; 895 case IPV6_ROUTER_ALERT_ISOLATE: 896 if (optlen < sizeof(int)) 897 goto e_inval; 898 np->rtalert_isolate = valbool; 899 retv = 0; 900 break; 901 case IPV6_MTU_DISCOVER: 902 if (optlen < sizeof(int)) 903 goto e_inval; 904 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT) 905 goto e_inval; 906 np->pmtudisc = val; 907 retv = 0; 908 break; 909 case IPV6_MTU: 910 if (optlen < sizeof(int)) 911 goto e_inval; 912 if (val && val < IPV6_MIN_MTU) 913 goto e_inval; 914 np->frag_size = val; 915 retv = 0; 916 break; 917 case IPV6_RECVERR: 918 if (optlen < sizeof(int)) 919 goto e_inval; 920 np->recverr = valbool; 921 if (!val) 922 skb_queue_purge(&sk->sk_error_queue); 923 retv = 0; 924 break; 925 case IPV6_FLOWINFO_SEND: 926 if (optlen < sizeof(int)) 927 goto e_inval; 928 np->sndflow = valbool; 929 retv = 0; 930 break; 931 case IPV6_FLOWLABEL_MGR: 932 retv = ipv6_flowlabel_opt(sk, optval, optlen); 933 break; 934 case IPV6_IPSEC_POLICY: 935 case IPV6_XFRM_POLICY: 936 retv = -EPERM; 937 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 938 break; 939 retv = xfrm_user_policy(sk, optname, optval, optlen); 940 break; 941 942 case IPV6_ADDR_PREFERENCES: 943 if (optlen < sizeof(int)) 944 goto e_inval; 945 retv = __ip6_sock_set_addr_preferences(sk, val); 946 break; 947 case IPV6_MINHOPCOUNT: 948 if (optlen < sizeof(int)) 949 goto e_inval; 950 if (val < 0 || val > 255) 951 goto e_inval; 952 np->min_hopcount = val; 953 retv = 0; 954 break; 955 case IPV6_DONTFRAG: 956 np->dontfrag = valbool; 957 retv = 0; 958 break; 959 case IPV6_AUTOFLOWLABEL: 960 np->autoflowlabel = valbool; 961 np->autoflowlabel_set = 1; 962 retv = 0; 963 break; 964 case IPV6_RECVFRAGSIZE: 965 np->rxopt.bits.recvfragsize = valbool; 966 retv = 0; 967 break; 968 case IPV6_RECVERR_RFC4884: 969 if (optlen < sizeof(int)) 970 goto e_inval; 971 if (val < 0 || val > 1) 972 goto e_inval; 973 np->recverr_rfc4884 = valbool; 974 retv = 0; 975 break; 976 } 977 978 release_sock(sk); 979 if (needs_rtnl) 980 rtnl_unlock(); 981 982 return retv; 983 984 e_inval: 985 release_sock(sk); 986 if (needs_rtnl) 987 rtnl_unlock(); 988 return -EINVAL; 989 } 990 991 int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, 992 unsigned int optlen) 993 { 994 int err; 995 996 if (level == SOL_IP && sk->sk_type != SOCK_RAW) 997 return udp_prot.setsockopt(sk, level, optname, optval, optlen); 998 999 if (level != SOL_IPV6) 1000 return -ENOPROTOOPT; 1001 1002 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen); 1003 #ifdef CONFIG_NETFILTER 1004 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1005 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY && 1006 optname != IPV6_XFRM_POLICY) 1007 err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen); 1008 #endif 1009 return err; 1010 } 1011 EXPORT_SYMBOL(ipv6_setsockopt); 1012 1013 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt, 1014 int optname, char __user *optval, int len) 1015 { 1016 struct ipv6_opt_hdr *hdr; 1017 1018 if (!opt) 1019 return 0; 1020 1021 switch (optname) { 1022 case IPV6_HOPOPTS: 1023 hdr = opt->hopopt; 1024 break; 1025 case IPV6_RTHDRDSTOPTS: 1026 hdr = opt->dst0opt; 1027 break; 1028 case IPV6_RTHDR: 1029 hdr = (struct ipv6_opt_hdr *)opt->srcrt; 1030 break; 1031 case IPV6_DSTOPTS: 1032 hdr = opt->dst1opt; 1033 break; 1034 default: 1035 return -EINVAL; /* should not happen */ 1036 } 1037 1038 if (!hdr) 1039 return 0; 1040 1041 len = min_t(unsigned int, len, ipv6_optlen(hdr)); 1042 if (copy_to_user(optval, hdr, len)) 1043 return -EFAULT; 1044 return len; 1045 } 1046 1047 static int ipv6_get_msfilter(struct sock *sk, void __user *optval, 1048 int __user *optlen, int len) 1049 { 1050 const int size0 = offsetof(struct group_filter, gf_slist); 1051 struct group_filter __user *p = optval; 1052 struct group_filter gsf; 1053 int num; 1054 int err; 1055 1056 if (len < size0) 1057 return -EINVAL; 1058 if (copy_from_user(&gsf, p, size0)) 1059 return -EFAULT; 1060 if (gsf.gf_group.ss_family != AF_INET6) 1061 return -EADDRNOTAVAIL; 1062 num = gsf.gf_numsrc; 1063 lock_sock(sk); 1064 err = ip6_mc_msfget(sk, &gsf, p->gf_slist); 1065 if (!err) { 1066 if (num > gsf.gf_numsrc) 1067 num = gsf.gf_numsrc; 1068 if (put_user(GROUP_FILTER_SIZE(num), optlen) || 1069 copy_to_user(p, &gsf, size0)) 1070 err = -EFAULT; 1071 } 1072 release_sock(sk); 1073 return err; 1074 } 1075 1076 static int compat_ipv6_get_msfilter(struct sock *sk, void __user *optval, 1077 int __user *optlen) 1078 { 1079 const int size0 = offsetof(struct compat_group_filter, gf_slist); 1080 struct compat_group_filter __user *p = optval; 1081 struct compat_group_filter gf32; 1082 struct group_filter gf; 1083 int len, err; 1084 int num; 1085 1086 if (get_user(len, optlen)) 1087 return -EFAULT; 1088 if (len < size0) 1089 return -EINVAL; 1090 1091 if (copy_from_user(&gf32, p, size0)) 1092 return -EFAULT; 1093 gf.gf_interface = gf32.gf_interface; 1094 gf.gf_fmode = gf32.gf_fmode; 1095 num = gf.gf_numsrc = gf32.gf_numsrc; 1096 gf.gf_group = gf32.gf_group; 1097 1098 if (gf.gf_group.ss_family != AF_INET6) 1099 return -EADDRNOTAVAIL; 1100 1101 lock_sock(sk); 1102 err = ip6_mc_msfget(sk, &gf, p->gf_slist); 1103 release_sock(sk); 1104 if (err) 1105 return err; 1106 if (num > gf.gf_numsrc) 1107 num = gf.gf_numsrc; 1108 len = GROUP_FILTER_SIZE(num) - (sizeof(gf)-sizeof(gf32)); 1109 if (put_user(len, optlen) || 1110 put_user(gf.gf_fmode, &p->gf_fmode) || 1111 put_user(gf.gf_numsrc, &p->gf_numsrc)) 1112 return -EFAULT; 1113 return 0; 1114 } 1115 1116 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname, 1117 char __user *optval, int __user *optlen, unsigned int flags) 1118 { 1119 struct ipv6_pinfo *np = inet6_sk(sk); 1120 int len; 1121 int val; 1122 1123 if (ip6_mroute_opt(optname)) 1124 return ip6_mroute_getsockopt(sk, optname, optval, optlen); 1125 1126 if (get_user(len, optlen)) 1127 return -EFAULT; 1128 switch (optname) { 1129 case IPV6_ADDRFORM: 1130 if (sk->sk_protocol != IPPROTO_UDP && 1131 sk->sk_protocol != IPPROTO_UDPLITE && 1132 sk->sk_protocol != IPPROTO_TCP) 1133 return -ENOPROTOOPT; 1134 if (sk->sk_state != TCP_ESTABLISHED) 1135 return -ENOTCONN; 1136 val = sk->sk_family; 1137 break; 1138 case MCAST_MSFILTER: 1139 if (in_compat_syscall()) 1140 return compat_ipv6_get_msfilter(sk, optval, optlen); 1141 return ipv6_get_msfilter(sk, optval, optlen, len); 1142 case IPV6_2292PKTOPTIONS: 1143 { 1144 struct msghdr msg; 1145 struct sk_buff *skb; 1146 1147 if (sk->sk_type != SOCK_STREAM) 1148 return -ENOPROTOOPT; 1149 1150 msg.msg_control = optval; 1151 msg.msg_controllen = len; 1152 msg.msg_flags = flags; 1153 msg.msg_control_is_user = true; 1154 1155 lock_sock(sk); 1156 skb = np->pktoptions; 1157 if (skb) 1158 ip6_datagram_recv_ctl(sk, &msg, skb); 1159 release_sock(sk); 1160 if (!skb) { 1161 if (np->rxopt.bits.rxinfo) { 1162 struct in6_pktinfo src_info; 1163 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif : 1164 np->sticky_pktinfo.ipi6_ifindex; 1165 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr; 1166 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info); 1167 } 1168 if (np->rxopt.bits.rxhlim) { 1169 int hlim = np->mcast_hops; 1170 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); 1171 } 1172 if (np->rxopt.bits.rxtclass) { 1173 int tclass = (int)ip6_tclass(np->rcv_flowinfo); 1174 1175 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass); 1176 } 1177 if (np->rxopt.bits.rxoinfo) { 1178 struct in6_pktinfo src_info; 1179 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif : 1180 np->sticky_pktinfo.ipi6_ifindex; 1181 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : 1182 np->sticky_pktinfo.ipi6_addr; 1183 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); 1184 } 1185 if (np->rxopt.bits.rxohlim) { 1186 int hlim = np->mcast_hops; 1187 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); 1188 } 1189 if (np->rxopt.bits.rxflow) { 1190 __be32 flowinfo = np->rcv_flowinfo; 1191 1192 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo); 1193 } 1194 } 1195 len -= msg.msg_controllen; 1196 return put_user(len, optlen); 1197 } 1198 case IPV6_MTU: 1199 { 1200 struct dst_entry *dst; 1201 1202 val = 0; 1203 rcu_read_lock(); 1204 dst = __sk_dst_get(sk); 1205 if (dst) 1206 val = dst_mtu(dst); 1207 rcu_read_unlock(); 1208 if (!val) 1209 return -ENOTCONN; 1210 break; 1211 } 1212 1213 case IPV6_V6ONLY: 1214 val = sk->sk_ipv6only; 1215 break; 1216 1217 case IPV6_RECVPKTINFO: 1218 val = np->rxopt.bits.rxinfo; 1219 break; 1220 1221 case IPV6_2292PKTINFO: 1222 val = np->rxopt.bits.rxoinfo; 1223 break; 1224 1225 case IPV6_RECVHOPLIMIT: 1226 val = np->rxopt.bits.rxhlim; 1227 break; 1228 1229 case IPV6_2292HOPLIMIT: 1230 val = np->rxopt.bits.rxohlim; 1231 break; 1232 1233 case IPV6_RECVRTHDR: 1234 val = np->rxopt.bits.srcrt; 1235 break; 1236 1237 case IPV6_2292RTHDR: 1238 val = np->rxopt.bits.osrcrt; 1239 break; 1240 1241 case IPV6_HOPOPTS: 1242 case IPV6_RTHDRDSTOPTS: 1243 case IPV6_RTHDR: 1244 case IPV6_DSTOPTS: 1245 { 1246 struct ipv6_txoptions *opt; 1247 1248 lock_sock(sk); 1249 opt = rcu_dereference_protected(np->opt, 1250 lockdep_sock_is_held(sk)); 1251 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len); 1252 release_sock(sk); 1253 /* check if ipv6_getsockopt_sticky() returns err code */ 1254 if (len < 0) 1255 return len; 1256 return put_user(len, optlen); 1257 } 1258 1259 case IPV6_RECVHOPOPTS: 1260 val = np->rxopt.bits.hopopts; 1261 break; 1262 1263 case IPV6_2292HOPOPTS: 1264 val = np->rxopt.bits.ohopopts; 1265 break; 1266 1267 case IPV6_RECVDSTOPTS: 1268 val = np->rxopt.bits.dstopts; 1269 break; 1270 1271 case IPV6_2292DSTOPTS: 1272 val = np->rxopt.bits.odstopts; 1273 break; 1274 1275 case IPV6_TCLASS: 1276 val = np->tclass; 1277 break; 1278 1279 case IPV6_RECVTCLASS: 1280 val = np->rxopt.bits.rxtclass; 1281 break; 1282 1283 case IPV6_FLOWINFO: 1284 val = np->rxopt.bits.rxflow; 1285 break; 1286 1287 case IPV6_RECVPATHMTU: 1288 val = np->rxopt.bits.rxpmtu; 1289 break; 1290 1291 case IPV6_PATHMTU: 1292 { 1293 struct dst_entry *dst; 1294 struct ip6_mtuinfo mtuinfo; 1295 1296 if (len < sizeof(mtuinfo)) 1297 return -EINVAL; 1298 1299 len = sizeof(mtuinfo); 1300 memset(&mtuinfo, 0, sizeof(mtuinfo)); 1301 1302 rcu_read_lock(); 1303 dst = __sk_dst_get(sk); 1304 if (dst) 1305 mtuinfo.ip6m_mtu = dst_mtu(dst); 1306 rcu_read_unlock(); 1307 if (!mtuinfo.ip6m_mtu) 1308 return -ENOTCONN; 1309 1310 if (put_user(len, optlen)) 1311 return -EFAULT; 1312 if (copy_to_user(optval, &mtuinfo, len)) 1313 return -EFAULT; 1314 1315 return 0; 1316 } 1317 1318 case IPV6_TRANSPARENT: 1319 val = inet_sk(sk)->transparent; 1320 break; 1321 1322 case IPV6_FREEBIND: 1323 val = inet_sk(sk)->freebind; 1324 break; 1325 1326 case IPV6_RECVORIGDSTADDR: 1327 val = np->rxopt.bits.rxorigdstaddr; 1328 break; 1329 1330 case IPV6_UNICAST_HOPS: 1331 case IPV6_MULTICAST_HOPS: 1332 { 1333 struct dst_entry *dst; 1334 1335 if (optname == IPV6_UNICAST_HOPS) 1336 val = np->hop_limit; 1337 else 1338 val = np->mcast_hops; 1339 1340 if (val < 0) { 1341 rcu_read_lock(); 1342 dst = __sk_dst_get(sk); 1343 if (dst) 1344 val = ip6_dst_hoplimit(dst); 1345 rcu_read_unlock(); 1346 } 1347 1348 if (val < 0) 1349 val = sock_net(sk)->ipv6.devconf_all->hop_limit; 1350 break; 1351 } 1352 1353 case IPV6_MULTICAST_LOOP: 1354 val = np->mc_loop; 1355 break; 1356 1357 case IPV6_MULTICAST_IF: 1358 val = np->mcast_oif; 1359 break; 1360 1361 case IPV6_MULTICAST_ALL: 1362 val = np->mc_all; 1363 break; 1364 1365 case IPV6_UNICAST_IF: 1366 val = (__force int)htonl((__u32) np->ucast_oif); 1367 break; 1368 1369 case IPV6_MTU_DISCOVER: 1370 val = np->pmtudisc; 1371 break; 1372 1373 case IPV6_RECVERR: 1374 val = np->recverr; 1375 break; 1376 1377 case IPV6_FLOWINFO_SEND: 1378 val = np->sndflow; 1379 break; 1380 1381 case IPV6_FLOWLABEL_MGR: 1382 { 1383 struct in6_flowlabel_req freq; 1384 int flags; 1385 1386 if (len < sizeof(freq)) 1387 return -EINVAL; 1388 1389 if (copy_from_user(&freq, optval, sizeof(freq))) 1390 return -EFAULT; 1391 1392 if (freq.flr_action != IPV6_FL_A_GET) 1393 return -EINVAL; 1394 1395 len = sizeof(freq); 1396 flags = freq.flr_flags; 1397 1398 memset(&freq, 0, sizeof(freq)); 1399 1400 val = ipv6_flowlabel_opt_get(sk, &freq, flags); 1401 if (val < 0) 1402 return val; 1403 1404 if (put_user(len, optlen)) 1405 return -EFAULT; 1406 if (copy_to_user(optval, &freq, len)) 1407 return -EFAULT; 1408 1409 return 0; 1410 } 1411 1412 case IPV6_ADDR_PREFERENCES: 1413 val = 0; 1414 1415 if (np->srcprefs & IPV6_PREFER_SRC_TMP) 1416 val |= IPV6_PREFER_SRC_TMP; 1417 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC) 1418 val |= IPV6_PREFER_SRC_PUBLIC; 1419 else { 1420 /* XXX: should we return system default? */ 1421 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT; 1422 } 1423 1424 if (np->srcprefs & IPV6_PREFER_SRC_COA) 1425 val |= IPV6_PREFER_SRC_COA; 1426 else 1427 val |= IPV6_PREFER_SRC_HOME; 1428 break; 1429 1430 case IPV6_MINHOPCOUNT: 1431 val = np->min_hopcount; 1432 break; 1433 1434 case IPV6_DONTFRAG: 1435 val = np->dontfrag; 1436 break; 1437 1438 case IPV6_AUTOFLOWLABEL: 1439 val = ip6_autoflowlabel(sock_net(sk), np); 1440 break; 1441 1442 case IPV6_RECVFRAGSIZE: 1443 val = np->rxopt.bits.recvfragsize; 1444 break; 1445 1446 case IPV6_ROUTER_ALERT_ISOLATE: 1447 val = np->rtalert_isolate; 1448 break; 1449 1450 case IPV6_RECVERR_RFC4884: 1451 val = np->recverr_rfc4884; 1452 break; 1453 1454 default: 1455 return -ENOPROTOOPT; 1456 } 1457 len = min_t(unsigned int, sizeof(int), len); 1458 if (put_user(len, optlen)) 1459 return -EFAULT; 1460 if (copy_to_user(optval, &val, len)) 1461 return -EFAULT; 1462 return 0; 1463 } 1464 1465 int ipv6_getsockopt(struct sock *sk, int level, int optname, 1466 char __user *optval, int __user *optlen) 1467 { 1468 int err; 1469 1470 if (level == SOL_IP && sk->sk_type != SOCK_RAW) 1471 return udp_prot.getsockopt(sk, level, optname, optval, optlen); 1472 1473 if (level != SOL_IPV6) 1474 return -ENOPROTOOPT; 1475 1476 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0); 1477 #ifdef CONFIG_NETFILTER 1478 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1479 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) { 1480 int len; 1481 1482 if (get_user(len, optlen)) 1483 return -EFAULT; 1484 1485 err = nf_getsockopt(sk, PF_INET6, optname, optval, &len); 1486 if (err >= 0) 1487 err = put_user(len, optlen); 1488 } 1489 #endif 1490 return err; 1491 } 1492 EXPORT_SYMBOL(ipv6_getsockopt); 1493