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 __ipv6_sock_ac_close(sk); 462 463 /* 464 * Sock is moving from IPv6 to IPv4 (sk_prot), so 465 * remove it from the refcnt debug socks count in the 466 * original family... 467 */ 468 sk_refcnt_debug_dec(sk); 469 470 if (sk->sk_protocol == IPPROTO_TCP) { 471 struct inet_connection_sock *icsk = inet_csk(sk); 472 local_bh_disable(); 473 sock_prot_inuse_add(net, sk->sk_prot, -1); 474 sock_prot_inuse_add(net, &tcp_prot, 1); 475 local_bh_enable(); 476 sk->sk_prot = &tcp_prot; 477 icsk->icsk_af_ops = &ipv4_specific; 478 sk->sk_socket->ops = &inet_stream_ops; 479 sk->sk_family = PF_INET; 480 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie); 481 } else { 482 struct proto *prot = &udp_prot; 483 484 if (sk->sk_protocol == IPPROTO_UDPLITE) 485 prot = &udplite_prot; 486 local_bh_disable(); 487 sock_prot_inuse_add(net, sk->sk_prot, -1); 488 sock_prot_inuse_add(net, prot, 1); 489 local_bh_enable(); 490 sk->sk_prot = prot; 491 sk->sk_socket->ops = &inet_dgram_ops; 492 sk->sk_family = PF_INET; 493 } 494 opt = xchg((__force struct ipv6_txoptions **)&np->opt, 495 NULL); 496 if (opt) { 497 atomic_sub(opt->tot_len, &sk->sk_omem_alloc); 498 txopt_put(opt); 499 } 500 pktopt = xchg(&np->pktoptions, NULL); 501 kfree_skb(pktopt); 502 503 /* 504 * ... and add it to the refcnt debug socks count 505 * in the new family. -acme 506 */ 507 sk_refcnt_debug_inc(sk); 508 module_put(THIS_MODULE); 509 retv = 0; 510 break; 511 } 512 goto e_inval; 513 514 case IPV6_V6ONLY: 515 if (optlen < sizeof(int) || 516 inet_sk(sk)->inet_num) 517 goto e_inval; 518 sk->sk_ipv6only = valbool; 519 retv = 0; 520 break; 521 522 case IPV6_RECVPKTINFO: 523 if (optlen < sizeof(int)) 524 goto e_inval; 525 np->rxopt.bits.rxinfo = valbool; 526 retv = 0; 527 break; 528 529 case IPV6_2292PKTINFO: 530 if (optlen < sizeof(int)) 531 goto e_inval; 532 np->rxopt.bits.rxoinfo = valbool; 533 retv = 0; 534 break; 535 536 case IPV6_RECVHOPLIMIT: 537 if (optlen < sizeof(int)) 538 goto e_inval; 539 np->rxopt.bits.rxhlim = valbool; 540 retv = 0; 541 break; 542 543 case IPV6_2292HOPLIMIT: 544 if (optlen < sizeof(int)) 545 goto e_inval; 546 np->rxopt.bits.rxohlim = valbool; 547 retv = 0; 548 break; 549 550 case IPV6_RECVRTHDR: 551 if (optlen < sizeof(int)) 552 goto e_inval; 553 np->rxopt.bits.srcrt = valbool; 554 retv = 0; 555 break; 556 557 case IPV6_2292RTHDR: 558 if (optlen < sizeof(int)) 559 goto e_inval; 560 np->rxopt.bits.osrcrt = valbool; 561 retv = 0; 562 break; 563 564 case IPV6_RECVHOPOPTS: 565 if (optlen < sizeof(int)) 566 goto e_inval; 567 np->rxopt.bits.hopopts = valbool; 568 retv = 0; 569 break; 570 571 case IPV6_2292HOPOPTS: 572 if (optlen < sizeof(int)) 573 goto e_inval; 574 np->rxopt.bits.ohopopts = valbool; 575 retv = 0; 576 break; 577 578 case IPV6_RECVDSTOPTS: 579 if (optlen < sizeof(int)) 580 goto e_inval; 581 np->rxopt.bits.dstopts = valbool; 582 retv = 0; 583 break; 584 585 case IPV6_2292DSTOPTS: 586 if (optlen < sizeof(int)) 587 goto e_inval; 588 np->rxopt.bits.odstopts = valbool; 589 retv = 0; 590 break; 591 592 case IPV6_TCLASS: 593 if (optlen < sizeof(int)) 594 goto e_inval; 595 if (val < -1 || val > 0xff) 596 goto e_inval; 597 /* RFC 3542, 6.5: default traffic class of 0x0 */ 598 if (val == -1) 599 val = 0; 600 np->tclass = val; 601 retv = 0; 602 break; 603 604 case IPV6_RECVTCLASS: 605 if (optlen < sizeof(int)) 606 goto e_inval; 607 np->rxopt.bits.rxtclass = valbool; 608 retv = 0; 609 break; 610 611 case IPV6_FLOWINFO: 612 if (optlen < sizeof(int)) 613 goto e_inval; 614 np->rxopt.bits.rxflow = valbool; 615 retv = 0; 616 break; 617 618 case IPV6_RECVPATHMTU: 619 if (optlen < sizeof(int)) 620 goto e_inval; 621 np->rxopt.bits.rxpmtu = valbool; 622 retv = 0; 623 break; 624 625 case IPV6_TRANSPARENT: 626 if (valbool && !ns_capable(net->user_ns, CAP_NET_RAW) && 627 !ns_capable(net->user_ns, CAP_NET_ADMIN)) { 628 retv = -EPERM; 629 break; 630 } 631 if (optlen < sizeof(int)) 632 goto e_inval; 633 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */ 634 inet_sk(sk)->transparent = valbool; 635 retv = 0; 636 break; 637 638 case IPV6_FREEBIND: 639 if (optlen < sizeof(int)) 640 goto e_inval; 641 /* we also don't have a separate freebind bit for IPV6 */ 642 inet_sk(sk)->freebind = valbool; 643 retv = 0; 644 break; 645 646 case IPV6_RECVORIGDSTADDR: 647 if (optlen < sizeof(int)) 648 goto e_inval; 649 np->rxopt.bits.rxorigdstaddr = valbool; 650 retv = 0; 651 break; 652 653 case IPV6_HOPOPTS: 654 case IPV6_RTHDRDSTOPTS: 655 case IPV6_RTHDR: 656 case IPV6_DSTOPTS: 657 retv = ipv6_set_opt_hdr(sk, optname, optval, optlen); 658 break; 659 660 case IPV6_PKTINFO: 661 { 662 struct in6_pktinfo pkt; 663 664 if (optlen == 0) 665 goto e_inval; 666 else if (optlen < sizeof(struct in6_pktinfo) || 667 sockptr_is_null(optval)) 668 goto e_inval; 669 670 if (copy_from_sockptr(&pkt, optval, sizeof(pkt))) { 671 retv = -EFAULT; 672 break; 673 } 674 if (!sk_dev_equal_l3scope(sk, pkt.ipi6_ifindex)) 675 goto e_inval; 676 677 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex; 678 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr; 679 retv = 0; 680 break; 681 } 682 683 case IPV6_2292PKTOPTIONS: 684 { 685 struct ipv6_txoptions *opt = NULL; 686 struct msghdr msg; 687 struct flowi6 fl6; 688 struct ipcm6_cookie ipc6; 689 690 memset(&fl6, 0, sizeof(fl6)); 691 fl6.flowi6_oif = sk->sk_bound_dev_if; 692 fl6.flowi6_mark = sk->sk_mark; 693 694 if (optlen == 0) 695 goto update; 696 697 /* 1K is probably excessive 698 * 1K is surely not enough, 2K per standard header is 16K. 699 */ 700 retv = -EINVAL; 701 if (optlen > 64*1024) 702 break; 703 704 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL); 705 retv = -ENOBUFS; 706 if (!opt) 707 break; 708 709 memset(opt, 0, sizeof(*opt)); 710 refcount_set(&opt->refcnt, 1); 711 opt->tot_len = sizeof(*opt) + optlen; 712 retv = -EFAULT; 713 if (copy_from_sockptr(opt + 1, optval, optlen)) 714 goto done; 715 716 msg.msg_controllen = optlen; 717 msg.msg_control = (void *)(opt+1); 718 ipc6.opt = opt; 719 720 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6); 721 if (retv) 722 goto done; 723 update: 724 retv = 0; 725 opt = ipv6_update_options(sk, opt); 726 done: 727 if (opt) { 728 atomic_sub(opt->tot_len, &sk->sk_omem_alloc); 729 txopt_put(opt); 730 } 731 break; 732 } 733 case IPV6_UNICAST_HOPS: 734 if (optlen < sizeof(int)) 735 goto e_inval; 736 if (val > 255 || val < -1) 737 goto e_inval; 738 np->hop_limit = val; 739 retv = 0; 740 break; 741 742 case IPV6_MULTICAST_HOPS: 743 if (sk->sk_type == SOCK_STREAM) 744 break; 745 if (optlen < sizeof(int)) 746 goto e_inval; 747 if (val > 255 || val < -1) 748 goto e_inval; 749 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val); 750 retv = 0; 751 break; 752 753 case IPV6_MULTICAST_LOOP: 754 if (optlen < sizeof(int)) 755 goto e_inval; 756 if (val != valbool) 757 goto e_inval; 758 np->mc_loop = valbool; 759 retv = 0; 760 break; 761 762 case IPV6_UNICAST_IF: 763 { 764 struct net_device *dev = NULL; 765 int ifindex; 766 767 if (optlen != sizeof(int)) 768 goto e_inval; 769 770 ifindex = (__force int)ntohl((__force __be32)val); 771 if (ifindex == 0) { 772 np->ucast_oif = 0; 773 retv = 0; 774 break; 775 } 776 777 dev = dev_get_by_index(net, ifindex); 778 retv = -EADDRNOTAVAIL; 779 if (!dev) 780 break; 781 dev_put(dev); 782 783 retv = -EINVAL; 784 if (sk->sk_bound_dev_if) 785 break; 786 787 np->ucast_oif = ifindex; 788 retv = 0; 789 break; 790 } 791 792 case IPV6_MULTICAST_IF: 793 if (sk->sk_type == SOCK_STREAM) 794 break; 795 if (optlen < sizeof(int)) 796 goto e_inval; 797 798 if (val) { 799 struct net_device *dev; 800 int midx; 801 802 rcu_read_lock(); 803 804 dev = dev_get_by_index_rcu(net, val); 805 if (!dev) { 806 rcu_read_unlock(); 807 retv = -ENODEV; 808 break; 809 } 810 midx = l3mdev_master_ifindex_rcu(dev); 811 812 rcu_read_unlock(); 813 814 if (sk->sk_bound_dev_if && 815 sk->sk_bound_dev_if != val && 816 (!midx || midx != sk->sk_bound_dev_if)) 817 goto e_inval; 818 } 819 np->mcast_oif = val; 820 retv = 0; 821 break; 822 case IPV6_ADD_MEMBERSHIP: 823 case IPV6_DROP_MEMBERSHIP: 824 { 825 struct ipv6_mreq mreq; 826 827 if (optlen < sizeof(struct ipv6_mreq)) 828 goto e_inval; 829 830 retv = -EPROTO; 831 if (inet_sk(sk)->is_icsk) 832 break; 833 834 retv = -EFAULT; 835 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq))) 836 break; 837 838 if (optname == IPV6_ADD_MEMBERSHIP) 839 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr); 840 else 841 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr); 842 break; 843 } 844 case IPV6_JOIN_ANYCAST: 845 case IPV6_LEAVE_ANYCAST: 846 { 847 struct ipv6_mreq mreq; 848 849 if (optlen < sizeof(struct ipv6_mreq)) 850 goto e_inval; 851 852 retv = -EFAULT; 853 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq))) 854 break; 855 856 if (optname == IPV6_JOIN_ANYCAST) 857 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr); 858 else 859 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr); 860 break; 861 } 862 case IPV6_MULTICAST_ALL: 863 if (optlen < sizeof(int)) 864 goto e_inval; 865 np->mc_all = valbool; 866 retv = 0; 867 break; 868 869 case MCAST_JOIN_GROUP: 870 case MCAST_LEAVE_GROUP: 871 if (in_compat_syscall()) 872 retv = compat_ipv6_mcast_join_leave(sk, optname, optval, 873 optlen); 874 else 875 retv = ipv6_mcast_join_leave(sk, optname, optval, 876 optlen); 877 break; 878 case MCAST_JOIN_SOURCE_GROUP: 879 case MCAST_LEAVE_SOURCE_GROUP: 880 case MCAST_BLOCK_SOURCE: 881 case MCAST_UNBLOCK_SOURCE: 882 retv = do_ipv6_mcast_group_source(sk, optname, optval, optlen); 883 break; 884 case MCAST_MSFILTER: 885 if (in_compat_syscall()) 886 retv = compat_ipv6_set_mcast_msfilter(sk, optval, 887 optlen); 888 else 889 retv = ipv6_set_mcast_msfilter(sk, optval, optlen); 890 break; 891 case IPV6_ROUTER_ALERT: 892 if (optlen < sizeof(int)) 893 goto e_inval; 894 retv = ip6_ra_control(sk, val); 895 break; 896 case IPV6_ROUTER_ALERT_ISOLATE: 897 if (optlen < sizeof(int)) 898 goto e_inval; 899 np->rtalert_isolate = valbool; 900 retv = 0; 901 break; 902 case IPV6_MTU_DISCOVER: 903 if (optlen < sizeof(int)) 904 goto e_inval; 905 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT) 906 goto e_inval; 907 np->pmtudisc = val; 908 retv = 0; 909 break; 910 case IPV6_MTU: 911 if (optlen < sizeof(int)) 912 goto e_inval; 913 if (val && val < IPV6_MIN_MTU) 914 goto e_inval; 915 np->frag_size = val; 916 retv = 0; 917 break; 918 case IPV6_RECVERR: 919 if (optlen < sizeof(int)) 920 goto e_inval; 921 np->recverr = valbool; 922 if (!val) 923 skb_queue_purge(&sk->sk_error_queue); 924 retv = 0; 925 break; 926 case IPV6_FLOWINFO_SEND: 927 if (optlen < sizeof(int)) 928 goto e_inval; 929 np->sndflow = valbool; 930 retv = 0; 931 break; 932 case IPV6_FLOWLABEL_MGR: 933 retv = ipv6_flowlabel_opt(sk, optval, optlen); 934 break; 935 case IPV6_IPSEC_POLICY: 936 case IPV6_XFRM_POLICY: 937 retv = -EPERM; 938 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 939 break; 940 retv = xfrm_user_policy(sk, optname, optval, optlen); 941 break; 942 943 case IPV6_ADDR_PREFERENCES: 944 if (optlen < sizeof(int)) 945 goto e_inval; 946 retv = __ip6_sock_set_addr_preferences(sk, val); 947 break; 948 case IPV6_MINHOPCOUNT: 949 if (optlen < sizeof(int)) 950 goto e_inval; 951 if (val < 0 || val > 255) 952 goto e_inval; 953 np->min_hopcount = val; 954 retv = 0; 955 break; 956 case IPV6_DONTFRAG: 957 np->dontfrag = valbool; 958 retv = 0; 959 break; 960 case IPV6_AUTOFLOWLABEL: 961 np->autoflowlabel = valbool; 962 np->autoflowlabel_set = 1; 963 retv = 0; 964 break; 965 case IPV6_RECVFRAGSIZE: 966 np->rxopt.bits.recvfragsize = valbool; 967 retv = 0; 968 break; 969 case IPV6_RECVERR_RFC4884: 970 if (optlen < sizeof(int)) 971 goto e_inval; 972 if (val < 0 || val > 1) 973 goto e_inval; 974 np->recverr_rfc4884 = valbool; 975 retv = 0; 976 break; 977 } 978 979 release_sock(sk); 980 if (needs_rtnl) 981 rtnl_unlock(); 982 983 return retv; 984 985 e_inval: 986 release_sock(sk); 987 if (needs_rtnl) 988 rtnl_unlock(); 989 return -EINVAL; 990 } 991 992 int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, 993 unsigned int optlen) 994 { 995 int err; 996 997 if (level == SOL_IP && sk->sk_type != SOCK_RAW) 998 return udp_prot.setsockopt(sk, level, optname, optval, optlen); 999 1000 if (level != SOL_IPV6) 1001 return -ENOPROTOOPT; 1002 1003 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen); 1004 #ifdef CONFIG_NETFILTER 1005 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1006 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY && 1007 optname != IPV6_XFRM_POLICY) 1008 err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen); 1009 #endif 1010 return err; 1011 } 1012 EXPORT_SYMBOL(ipv6_setsockopt); 1013 1014 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt, 1015 int optname, char __user *optval, int len) 1016 { 1017 struct ipv6_opt_hdr *hdr; 1018 1019 if (!opt) 1020 return 0; 1021 1022 switch (optname) { 1023 case IPV6_HOPOPTS: 1024 hdr = opt->hopopt; 1025 break; 1026 case IPV6_RTHDRDSTOPTS: 1027 hdr = opt->dst0opt; 1028 break; 1029 case IPV6_RTHDR: 1030 hdr = (struct ipv6_opt_hdr *)opt->srcrt; 1031 break; 1032 case IPV6_DSTOPTS: 1033 hdr = opt->dst1opt; 1034 break; 1035 default: 1036 return -EINVAL; /* should not happen */ 1037 } 1038 1039 if (!hdr) 1040 return 0; 1041 1042 len = min_t(unsigned int, len, ipv6_optlen(hdr)); 1043 if (copy_to_user(optval, hdr, len)) 1044 return -EFAULT; 1045 return len; 1046 } 1047 1048 static int ipv6_get_msfilter(struct sock *sk, void __user *optval, 1049 int __user *optlen, int len) 1050 { 1051 const int size0 = offsetof(struct group_filter, gf_slist); 1052 struct group_filter __user *p = optval; 1053 struct group_filter gsf; 1054 int num; 1055 int err; 1056 1057 if (len < size0) 1058 return -EINVAL; 1059 if (copy_from_user(&gsf, p, size0)) 1060 return -EFAULT; 1061 if (gsf.gf_group.ss_family != AF_INET6) 1062 return -EADDRNOTAVAIL; 1063 num = gsf.gf_numsrc; 1064 lock_sock(sk); 1065 err = ip6_mc_msfget(sk, &gsf, p->gf_slist); 1066 if (!err) { 1067 if (num > gsf.gf_numsrc) 1068 num = gsf.gf_numsrc; 1069 if (put_user(GROUP_FILTER_SIZE(num), optlen) || 1070 copy_to_user(p, &gsf, size0)) 1071 err = -EFAULT; 1072 } 1073 release_sock(sk); 1074 return err; 1075 } 1076 1077 static int compat_ipv6_get_msfilter(struct sock *sk, void __user *optval, 1078 int __user *optlen) 1079 { 1080 const int size0 = offsetof(struct compat_group_filter, gf_slist); 1081 struct compat_group_filter __user *p = optval; 1082 struct compat_group_filter gf32; 1083 struct group_filter gf; 1084 int len, err; 1085 int num; 1086 1087 if (get_user(len, optlen)) 1088 return -EFAULT; 1089 if (len < size0) 1090 return -EINVAL; 1091 1092 if (copy_from_user(&gf32, p, size0)) 1093 return -EFAULT; 1094 gf.gf_interface = gf32.gf_interface; 1095 gf.gf_fmode = gf32.gf_fmode; 1096 num = gf.gf_numsrc = gf32.gf_numsrc; 1097 gf.gf_group = gf32.gf_group; 1098 1099 if (gf.gf_group.ss_family != AF_INET6) 1100 return -EADDRNOTAVAIL; 1101 1102 lock_sock(sk); 1103 err = ip6_mc_msfget(sk, &gf, p->gf_slist); 1104 release_sock(sk); 1105 if (err) 1106 return err; 1107 if (num > gf.gf_numsrc) 1108 num = gf.gf_numsrc; 1109 len = GROUP_FILTER_SIZE(num) - (sizeof(gf)-sizeof(gf32)); 1110 if (put_user(len, optlen) || 1111 put_user(gf.gf_fmode, &p->gf_fmode) || 1112 put_user(gf.gf_numsrc, &p->gf_numsrc)) 1113 return -EFAULT; 1114 return 0; 1115 } 1116 1117 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname, 1118 char __user *optval, int __user *optlen, unsigned int flags) 1119 { 1120 struct ipv6_pinfo *np = inet6_sk(sk); 1121 int len; 1122 int val; 1123 1124 if (ip6_mroute_opt(optname)) 1125 return ip6_mroute_getsockopt(sk, optname, optval, optlen); 1126 1127 if (get_user(len, optlen)) 1128 return -EFAULT; 1129 switch (optname) { 1130 case IPV6_ADDRFORM: 1131 if (sk->sk_protocol != IPPROTO_UDP && 1132 sk->sk_protocol != IPPROTO_UDPLITE && 1133 sk->sk_protocol != IPPROTO_TCP) 1134 return -ENOPROTOOPT; 1135 if (sk->sk_state != TCP_ESTABLISHED) 1136 return -ENOTCONN; 1137 val = sk->sk_family; 1138 break; 1139 case MCAST_MSFILTER: 1140 if (in_compat_syscall()) 1141 return compat_ipv6_get_msfilter(sk, optval, optlen); 1142 return ipv6_get_msfilter(sk, optval, optlen, len); 1143 case IPV6_2292PKTOPTIONS: 1144 { 1145 struct msghdr msg; 1146 struct sk_buff *skb; 1147 1148 if (sk->sk_type != SOCK_STREAM) 1149 return -ENOPROTOOPT; 1150 1151 msg.msg_control = optval; 1152 msg.msg_controllen = len; 1153 msg.msg_flags = flags; 1154 msg.msg_control_is_user = true; 1155 1156 lock_sock(sk); 1157 skb = np->pktoptions; 1158 if (skb) 1159 ip6_datagram_recv_ctl(sk, &msg, skb); 1160 release_sock(sk); 1161 if (!skb) { 1162 if (np->rxopt.bits.rxinfo) { 1163 struct in6_pktinfo src_info; 1164 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif : 1165 np->sticky_pktinfo.ipi6_ifindex; 1166 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr; 1167 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info); 1168 } 1169 if (np->rxopt.bits.rxhlim) { 1170 int hlim = np->mcast_hops; 1171 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); 1172 } 1173 if (np->rxopt.bits.rxtclass) { 1174 int tclass = (int)ip6_tclass(np->rcv_flowinfo); 1175 1176 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass); 1177 } 1178 if (np->rxopt.bits.rxoinfo) { 1179 struct in6_pktinfo src_info; 1180 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif : 1181 np->sticky_pktinfo.ipi6_ifindex; 1182 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : 1183 np->sticky_pktinfo.ipi6_addr; 1184 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); 1185 } 1186 if (np->rxopt.bits.rxohlim) { 1187 int hlim = np->mcast_hops; 1188 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); 1189 } 1190 if (np->rxopt.bits.rxflow) { 1191 __be32 flowinfo = np->rcv_flowinfo; 1192 1193 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo); 1194 } 1195 } 1196 len -= msg.msg_controllen; 1197 return put_user(len, optlen); 1198 } 1199 case IPV6_MTU: 1200 { 1201 struct dst_entry *dst; 1202 1203 val = 0; 1204 rcu_read_lock(); 1205 dst = __sk_dst_get(sk); 1206 if (dst) 1207 val = dst_mtu(dst); 1208 rcu_read_unlock(); 1209 if (!val) 1210 return -ENOTCONN; 1211 break; 1212 } 1213 1214 case IPV6_V6ONLY: 1215 val = sk->sk_ipv6only; 1216 break; 1217 1218 case IPV6_RECVPKTINFO: 1219 val = np->rxopt.bits.rxinfo; 1220 break; 1221 1222 case IPV6_2292PKTINFO: 1223 val = np->rxopt.bits.rxoinfo; 1224 break; 1225 1226 case IPV6_RECVHOPLIMIT: 1227 val = np->rxopt.bits.rxhlim; 1228 break; 1229 1230 case IPV6_2292HOPLIMIT: 1231 val = np->rxopt.bits.rxohlim; 1232 break; 1233 1234 case IPV6_RECVRTHDR: 1235 val = np->rxopt.bits.srcrt; 1236 break; 1237 1238 case IPV6_2292RTHDR: 1239 val = np->rxopt.bits.osrcrt; 1240 break; 1241 1242 case IPV6_HOPOPTS: 1243 case IPV6_RTHDRDSTOPTS: 1244 case IPV6_RTHDR: 1245 case IPV6_DSTOPTS: 1246 { 1247 struct ipv6_txoptions *opt; 1248 1249 lock_sock(sk); 1250 opt = rcu_dereference_protected(np->opt, 1251 lockdep_sock_is_held(sk)); 1252 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len); 1253 release_sock(sk); 1254 /* check if ipv6_getsockopt_sticky() returns err code */ 1255 if (len < 0) 1256 return len; 1257 return put_user(len, optlen); 1258 } 1259 1260 case IPV6_RECVHOPOPTS: 1261 val = np->rxopt.bits.hopopts; 1262 break; 1263 1264 case IPV6_2292HOPOPTS: 1265 val = np->rxopt.bits.ohopopts; 1266 break; 1267 1268 case IPV6_RECVDSTOPTS: 1269 val = np->rxopt.bits.dstopts; 1270 break; 1271 1272 case IPV6_2292DSTOPTS: 1273 val = np->rxopt.bits.odstopts; 1274 break; 1275 1276 case IPV6_TCLASS: 1277 val = np->tclass; 1278 break; 1279 1280 case IPV6_RECVTCLASS: 1281 val = np->rxopt.bits.rxtclass; 1282 break; 1283 1284 case IPV6_FLOWINFO: 1285 val = np->rxopt.bits.rxflow; 1286 break; 1287 1288 case IPV6_RECVPATHMTU: 1289 val = np->rxopt.bits.rxpmtu; 1290 break; 1291 1292 case IPV6_PATHMTU: 1293 { 1294 struct dst_entry *dst; 1295 struct ip6_mtuinfo mtuinfo; 1296 1297 if (len < sizeof(mtuinfo)) 1298 return -EINVAL; 1299 1300 len = sizeof(mtuinfo); 1301 memset(&mtuinfo, 0, sizeof(mtuinfo)); 1302 1303 rcu_read_lock(); 1304 dst = __sk_dst_get(sk); 1305 if (dst) 1306 mtuinfo.ip6m_mtu = dst_mtu(dst); 1307 rcu_read_unlock(); 1308 if (!mtuinfo.ip6m_mtu) 1309 return -ENOTCONN; 1310 1311 if (put_user(len, optlen)) 1312 return -EFAULT; 1313 if (copy_to_user(optval, &mtuinfo, len)) 1314 return -EFAULT; 1315 1316 return 0; 1317 } 1318 1319 case IPV6_TRANSPARENT: 1320 val = inet_sk(sk)->transparent; 1321 break; 1322 1323 case IPV6_FREEBIND: 1324 val = inet_sk(sk)->freebind; 1325 break; 1326 1327 case IPV6_RECVORIGDSTADDR: 1328 val = np->rxopt.bits.rxorigdstaddr; 1329 break; 1330 1331 case IPV6_UNICAST_HOPS: 1332 case IPV6_MULTICAST_HOPS: 1333 { 1334 struct dst_entry *dst; 1335 1336 if (optname == IPV6_UNICAST_HOPS) 1337 val = np->hop_limit; 1338 else 1339 val = np->mcast_hops; 1340 1341 if (val < 0) { 1342 rcu_read_lock(); 1343 dst = __sk_dst_get(sk); 1344 if (dst) 1345 val = ip6_dst_hoplimit(dst); 1346 rcu_read_unlock(); 1347 } 1348 1349 if (val < 0) 1350 val = sock_net(sk)->ipv6.devconf_all->hop_limit; 1351 break; 1352 } 1353 1354 case IPV6_MULTICAST_LOOP: 1355 val = np->mc_loop; 1356 break; 1357 1358 case IPV6_MULTICAST_IF: 1359 val = np->mcast_oif; 1360 break; 1361 1362 case IPV6_MULTICAST_ALL: 1363 val = np->mc_all; 1364 break; 1365 1366 case IPV6_UNICAST_IF: 1367 val = (__force int)htonl((__u32) np->ucast_oif); 1368 break; 1369 1370 case IPV6_MTU_DISCOVER: 1371 val = np->pmtudisc; 1372 break; 1373 1374 case IPV6_RECVERR: 1375 val = np->recverr; 1376 break; 1377 1378 case IPV6_FLOWINFO_SEND: 1379 val = np->sndflow; 1380 break; 1381 1382 case IPV6_FLOWLABEL_MGR: 1383 { 1384 struct in6_flowlabel_req freq; 1385 int flags; 1386 1387 if (len < sizeof(freq)) 1388 return -EINVAL; 1389 1390 if (copy_from_user(&freq, optval, sizeof(freq))) 1391 return -EFAULT; 1392 1393 if (freq.flr_action != IPV6_FL_A_GET) 1394 return -EINVAL; 1395 1396 len = sizeof(freq); 1397 flags = freq.flr_flags; 1398 1399 memset(&freq, 0, sizeof(freq)); 1400 1401 val = ipv6_flowlabel_opt_get(sk, &freq, flags); 1402 if (val < 0) 1403 return val; 1404 1405 if (put_user(len, optlen)) 1406 return -EFAULT; 1407 if (copy_to_user(optval, &freq, len)) 1408 return -EFAULT; 1409 1410 return 0; 1411 } 1412 1413 case IPV6_ADDR_PREFERENCES: 1414 val = 0; 1415 1416 if (np->srcprefs & IPV6_PREFER_SRC_TMP) 1417 val |= IPV6_PREFER_SRC_TMP; 1418 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC) 1419 val |= IPV6_PREFER_SRC_PUBLIC; 1420 else { 1421 /* XXX: should we return system default? */ 1422 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT; 1423 } 1424 1425 if (np->srcprefs & IPV6_PREFER_SRC_COA) 1426 val |= IPV6_PREFER_SRC_COA; 1427 else 1428 val |= IPV6_PREFER_SRC_HOME; 1429 break; 1430 1431 case IPV6_MINHOPCOUNT: 1432 val = np->min_hopcount; 1433 break; 1434 1435 case IPV6_DONTFRAG: 1436 val = np->dontfrag; 1437 break; 1438 1439 case IPV6_AUTOFLOWLABEL: 1440 val = ip6_autoflowlabel(sock_net(sk), np); 1441 break; 1442 1443 case IPV6_RECVFRAGSIZE: 1444 val = np->rxopt.bits.recvfragsize; 1445 break; 1446 1447 case IPV6_ROUTER_ALERT_ISOLATE: 1448 val = np->rtalert_isolate; 1449 break; 1450 1451 case IPV6_RECVERR_RFC4884: 1452 val = np->recverr_rfc4884; 1453 break; 1454 1455 default: 1456 return -ENOPROTOOPT; 1457 } 1458 len = min_t(unsigned int, sizeof(int), len); 1459 if (put_user(len, optlen)) 1460 return -EFAULT; 1461 if (copy_to_user(optval, &val, len)) 1462 return -EFAULT; 1463 return 0; 1464 } 1465 1466 int ipv6_getsockopt(struct sock *sk, int level, int optname, 1467 char __user *optval, int __user *optlen) 1468 { 1469 int err; 1470 1471 if (level == SOL_IP && sk->sk_type != SOCK_RAW) 1472 return udp_prot.getsockopt(sk, level, optname, optval, optlen); 1473 1474 if (level != SOL_IPV6) 1475 return -ENOPROTOOPT; 1476 1477 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0); 1478 #ifdef CONFIG_NETFILTER 1479 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1480 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) { 1481 int len; 1482 1483 if (get_user(len, optlen)) 1484 return -EFAULT; 1485 1486 err = nf_getsockopt(sk, PF_INET6, optname, optval, &len); 1487 if (err >= 0) 1488 err = put_user(len, optlen); 1489 } 1490 #endif 1491 return err; 1492 } 1493 EXPORT_SYMBOL(ipv6_getsockopt); 1494