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 DEFINE_STATIC_KEY_FALSE(ip6_min_hopcount); 59 60 int ip6_ra_control(struct sock *sk, int sel) 61 { 62 struct ip6_ra_chain *ra, *new_ra, **rap; 63 64 /* RA packet may be delivered ONLY to IPPROTO_RAW socket */ 65 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num != IPPROTO_RAW) 66 return -ENOPROTOOPT; 67 68 new_ra = (sel >= 0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL; 69 if (sel >= 0 && !new_ra) 70 return -ENOMEM; 71 72 write_lock_bh(&ip6_ra_lock); 73 for (rap = &ip6_ra_chain; (ra = *rap) != NULL; rap = &ra->next) { 74 if (ra->sk == sk) { 75 if (sel >= 0) { 76 write_unlock_bh(&ip6_ra_lock); 77 kfree(new_ra); 78 return -EADDRINUSE; 79 } 80 81 *rap = ra->next; 82 write_unlock_bh(&ip6_ra_lock); 83 84 sock_put(sk); 85 kfree(ra); 86 return 0; 87 } 88 } 89 if (!new_ra) { 90 write_unlock_bh(&ip6_ra_lock); 91 return -ENOBUFS; 92 } 93 new_ra->sk = sk; 94 new_ra->sel = sel; 95 new_ra->next = ra; 96 *rap = new_ra; 97 sock_hold(sk); 98 write_unlock_bh(&ip6_ra_lock); 99 return 0; 100 } 101 102 struct ipv6_txoptions *ipv6_update_options(struct sock *sk, 103 struct ipv6_txoptions *opt) 104 { 105 if (inet_sk(sk)->is_icsk) { 106 if (opt && 107 !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) && 108 inet_sk(sk)->inet_daddr != LOOPBACK4_IPV6) { 109 struct inet_connection_sock *icsk = inet_csk(sk); 110 icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen; 111 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie); 112 } 113 } 114 opt = xchg((__force struct ipv6_txoptions **)&inet6_sk(sk)->opt, 115 opt); 116 sk_dst_reset(sk); 117 118 return opt; 119 } 120 121 static bool setsockopt_needs_rtnl(int optname) 122 { 123 switch (optname) { 124 case IPV6_ADDRFORM: 125 case IPV6_ADD_MEMBERSHIP: 126 case IPV6_DROP_MEMBERSHIP: 127 case IPV6_JOIN_ANYCAST: 128 case IPV6_LEAVE_ANYCAST: 129 case MCAST_JOIN_GROUP: 130 case MCAST_LEAVE_GROUP: 131 case MCAST_JOIN_SOURCE_GROUP: 132 case MCAST_LEAVE_SOURCE_GROUP: 133 case MCAST_BLOCK_SOURCE: 134 case MCAST_UNBLOCK_SOURCE: 135 case MCAST_MSFILTER: 136 return true; 137 } 138 return false; 139 } 140 141 static int copy_group_source_from_sockptr(struct group_source_req *greqs, 142 sockptr_t optval, int optlen) 143 { 144 if (in_compat_syscall()) { 145 struct compat_group_source_req gr32; 146 147 if (optlen < sizeof(gr32)) 148 return -EINVAL; 149 if (copy_from_sockptr(&gr32, optval, sizeof(gr32))) 150 return -EFAULT; 151 greqs->gsr_interface = gr32.gsr_interface; 152 greqs->gsr_group = gr32.gsr_group; 153 greqs->gsr_source = gr32.gsr_source; 154 } else { 155 if (optlen < sizeof(*greqs)) 156 return -EINVAL; 157 if (copy_from_sockptr(greqs, optval, sizeof(*greqs))) 158 return -EFAULT; 159 } 160 161 return 0; 162 } 163 164 static int do_ipv6_mcast_group_source(struct sock *sk, int optname, 165 sockptr_t optval, int optlen) 166 { 167 struct group_source_req greqs; 168 int omode, add; 169 int ret; 170 171 ret = copy_group_source_from_sockptr(&greqs, optval, optlen); 172 if (ret) 173 return ret; 174 175 if (greqs.gsr_group.ss_family != AF_INET6 || 176 greqs.gsr_source.ss_family != AF_INET6) 177 return -EADDRNOTAVAIL; 178 179 if (optname == MCAST_BLOCK_SOURCE) { 180 omode = MCAST_EXCLUDE; 181 add = 1; 182 } else if (optname == MCAST_UNBLOCK_SOURCE) { 183 omode = MCAST_EXCLUDE; 184 add = 0; 185 } else if (optname == MCAST_JOIN_SOURCE_GROUP) { 186 struct sockaddr_in6 *psin6; 187 int retv; 188 189 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group; 190 retv = ipv6_sock_mc_join_ssm(sk, greqs.gsr_interface, 191 &psin6->sin6_addr, 192 MCAST_INCLUDE); 193 /* prior join w/ different source is ok */ 194 if (retv && retv != -EADDRINUSE) 195 return retv; 196 omode = MCAST_INCLUDE; 197 add = 1; 198 } else /* MCAST_LEAVE_SOURCE_GROUP */ { 199 omode = MCAST_INCLUDE; 200 add = 0; 201 } 202 return ip6_mc_source(add, omode, sk, &greqs); 203 } 204 205 static int ipv6_set_mcast_msfilter(struct sock *sk, sockptr_t optval, 206 int optlen) 207 { 208 struct group_filter *gsf; 209 int ret; 210 211 if (optlen < GROUP_FILTER_SIZE(0)) 212 return -EINVAL; 213 if (optlen > READ_ONCE(sysctl_optmem_max)) 214 return -ENOBUFS; 215 216 gsf = memdup_sockptr(optval, optlen); 217 if (IS_ERR(gsf)) 218 return PTR_ERR(gsf); 219 220 /* numsrc >= (4G-140)/128 overflow in 32 bits */ 221 ret = -ENOBUFS; 222 if (gsf->gf_numsrc >= 0x1ffffffU || 223 gsf->gf_numsrc > sysctl_mld_max_msf) 224 goto out_free_gsf; 225 226 ret = -EINVAL; 227 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) 228 goto out_free_gsf; 229 230 ret = ip6_mc_msfilter(sk, gsf, gsf->gf_slist_flex); 231 out_free_gsf: 232 kfree(gsf); 233 return ret; 234 } 235 236 static int compat_ipv6_set_mcast_msfilter(struct sock *sk, sockptr_t optval, 237 int optlen) 238 { 239 const int size0 = offsetof(struct compat_group_filter, gf_slist_flex); 240 struct compat_group_filter *gf32; 241 void *p; 242 int ret; 243 int n; 244 245 if (optlen < size0) 246 return -EINVAL; 247 if (optlen > READ_ONCE(sysctl_optmem_max) - 4) 248 return -ENOBUFS; 249 250 p = kmalloc(optlen + 4, GFP_KERNEL); 251 if (!p) 252 return -ENOMEM; 253 254 gf32 = p + 4; /* we want ->gf_group and ->gf_slist_flex aligned */ 255 ret = -EFAULT; 256 if (copy_from_sockptr(gf32, optval, optlen)) 257 goto out_free_p; 258 259 /* numsrc >= (4G-140)/128 overflow in 32 bits */ 260 ret = -ENOBUFS; 261 n = gf32->gf_numsrc; 262 if (n >= 0x1ffffffU || n > sysctl_mld_max_msf) 263 goto out_free_p; 264 265 ret = -EINVAL; 266 if (offsetof(struct compat_group_filter, gf_slist_flex[n]) > optlen) 267 goto out_free_p; 268 269 ret = ip6_mc_msfilter(sk, &(struct group_filter){ 270 .gf_interface = gf32->gf_interface, 271 .gf_group = gf32->gf_group, 272 .gf_fmode = gf32->gf_fmode, 273 .gf_numsrc = gf32->gf_numsrc}, gf32->gf_slist_flex); 274 275 out_free_p: 276 kfree(p); 277 return ret; 278 } 279 280 static int ipv6_mcast_join_leave(struct sock *sk, int optname, 281 sockptr_t optval, int optlen) 282 { 283 struct sockaddr_in6 *psin6; 284 struct group_req greq; 285 286 if (optlen < sizeof(greq)) 287 return -EINVAL; 288 if (copy_from_sockptr(&greq, optval, sizeof(greq))) 289 return -EFAULT; 290 291 if (greq.gr_group.ss_family != AF_INET6) 292 return -EADDRNOTAVAIL; 293 psin6 = (struct sockaddr_in6 *)&greq.gr_group; 294 if (optname == MCAST_JOIN_GROUP) 295 return ipv6_sock_mc_join(sk, greq.gr_interface, 296 &psin6->sin6_addr); 297 return ipv6_sock_mc_drop(sk, greq.gr_interface, &psin6->sin6_addr); 298 } 299 300 static int compat_ipv6_mcast_join_leave(struct sock *sk, int optname, 301 sockptr_t optval, int optlen) 302 { 303 struct compat_group_req gr32; 304 struct sockaddr_in6 *psin6; 305 306 if (optlen < sizeof(gr32)) 307 return -EINVAL; 308 if (copy_from_sockptr(&gr32, optval, sizeof(gr32))) 309 return -EFAULT; 310 311 if (gr32.gr_group.ss_family != AF_INET6) 312 return -EADDRNOTAVAIL; 313 psin6 = (struct sockaddr_in6 *)&gr32.gr_group; 314 if (optname == MCAST_JOIN_GROUP) 315 return ipv6_sock_mc_join(sk, gr32.gr_interface, 316 &psin6->sin6_addr); 317 return ipv6_sock_mc_drop(sk, gr32.gr_interface, &psin6->sin6_addr); 318 } 319 320 static int ipv6_set_opt_hdr(struct sock *sk, int optname, sockptr_t optval, 321 int optlen) 322 { 323 struct ipv6_pinfo *np = inet6_sk(sk); 324 struct ipv6_opt_hdr *new = NULL; 325 struct net *net = sock_net(sk); 326 struct ipv6_txoptions *opt; 327 int err; 328 329 /* hop-by-hop / destination options are privileged option */ 330 if (optname != IPV6_RTHDR && !sockopt_ns_capable(net->user_ns, CAP_NET_RAW)) 331 return -EPERM; 332 333 /* remove any sticky options header with a zero option 334 * length, per RFC3542. 335 */ 336 if (optlen > 0) { 337 if (sockptr_is_null(optval)) 338 return -EINVAL; 339 if (optlen < sizeof(struct ipv6_opt_hdr) || 340 optlen & 0x7 || 341 optlen > 8 * 255) 342 return -EINVAL; 343 344 new = memdup_sockptr(optval, optlen); 345 if (IS_ERR(new)) 346 return PTR_ERR(new); 347 if (unlikely(ipv6_optlen(new) > optlen)) { 348 kfree(new); 349 return -EINVAL; 350 } 351 } 352 353 opt = rcu_dereference_protected(np->opt, lockdep_sock_is_held(sk)); 354 opt = ipv6_renew_options(sk, opt, optname, new); 355 kfree(new); 356 if (IS_ERR(opt)) 357 return PTR_ERR(opt); 358 359 /* routing header option needs extra check */ 360 err = -EINVAL; 361 if (optname == IPV6_RTHDR && opt && opt->srcrt) { 362 struct ipv6_rt_hdr *rthdr = opt->srcrt; 363 switch (rthdr->type) { 364 #if IS_ENABLED(CONFIG_IPV6_MIP6) 365 case IPV6_SRCRT_TYPE_2: 366 if (rthdr->hdrlen != 2 || rthdr->segments_left != 1) 367 goto sticky_done; 368 break; 369 #endif 370 case IPV6_SRCRT_TYPE_4: 371 { 372 struct ipv6_sr_hdr *srh = 373 (struct ipv6_sr_hdr *)opt->srcrt; 374 375 if (!seg6_validate_srh(srh, optlen, false)) 376 goto sticky_done; 377 break; 378 } 379 default: 380 goto sticky_done; 381 } 382 } 383 384 err = 0; 385 opt = ipv6_update_options(sk, opt); 386 sticky_done: 387 if (opt) { 388 atomic_sub(opt->tot_len, &sk->sk_omem_alloc); 389 txopt_put(opt); 390 } 391 return err; 392 } 393 394 int do_ipv6_setsockopt(struct sock *sk, int level, int optname, 395 sockptr_t optval, unsigned int optlen) 396 { 397 struct ipv6_pinfo *np = inet6_sk(sk); 398 struct net *net = sock_net(sk); 399 int val, valbool; 400 int retv = -ENOPROTOOPT; 401 bool needs_rtnl = setsockopt_needs_rtnl(optname); 402 403 if (sockptr_is_null(optval)) 404 val = 0; 405 else { 406 if (optlen >= sizeof(int)) { 407 if (copy_from_sockptr(&val, optval, sizeof(val))) 408 return -EFAULT; 409 } else 410 val = 0; 411 } 412 413 valbool = (val != 0); 414 415 if (ip6_mroute_opt(optname)) 416 return ip6_mroute_setsockopt(sk, optname, optval, optlen); 417 418 if (needs_rtnl) 419 rtnl_lock(); 420 sockopt_lock_sock(sk); 421 422 /* Another thread has converted the socket into IPv4 with 423 * IPV6_ADDRFORM concurrently. 424 */ 425 if (unlikely(sk->sk_family != AF_INET6)) 426 goto unlock; 427 428 switch (optname) { 429 430 case IPV6_ADDRFORM: 431 if (optlen < sizeof(int)) 432 goto e_inval; 433 if (val == PF_INET) { 434 if (sk->sk_type == SOCK_RAW) 435 break; 436 437 if (sk->sk_protocol == IPPROTO_UDP || 438 sk->sk_protocol == IPPROTO_UDPLITE) { 439 struct udp_sock *up = udp_sk(sk); 440 if (up->pending == AF_INET6) { 441 retv = -EBUSY; 442 break; 443 } 444 } else if (sk->sk_protocol == IPPROTO_TCP) { 445 if (sk->sk_prot != &tcpv6_prot) { 446 retv = -EBUSY; 447 break; 448 } 449 } else { 450 break; 451 } 452 453 if (sk->sk_state != TCP_ESTABLISHED) { 454 retv = -ENOTCONN; 455 break; 456 } 457 458 if (ipv6_only_sock(sk) || 459 !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) { 460 retv = -EADDRNOTAVAIL; 461 break; 462 } 463 464 __ipv6_sock_mc_close(sk); 465 __ipv6_sock_ac_close(sk); 466 467 /* 468 * Sock is moving from IPv6 to IPv4 (sk_prot), so 469 * remove it from the refcnt debug socks count in the 470 * original family... 471 */ 472 sk_refcnt_debug_dec(sk); 473 474 if (sk->sk_protocol == IPPROTO_TCP) { 475 struct inet_connection_sock *icsk = inet_csk(sk); 476 477 sock_prot_inuse_add(net, sk->sk_prot, -1); 478 sock_prot_inuse_add(net, &tcp_prot, 1); 479 480 /* Paired with READ_ONCE(sk->sk_prot) in inet6_stream_ops */ 481 WRITE_ONCE(sk->sk_prot, &tcp_prot); 482 /* Paired with READ_ONCE() in tcp_(get|set)sockopt() */ 483 WRITE_ONCE(icsk->icsk_af_ops, &ipv4_specific); 484 sk->sk_socket->ops = &inet_stream_ops; 485 sk->sk_family = PF_INET; 486 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie); 487 } else { 488 struct proto *prot = &udp_prot; 489 490 if (sk->sk_protocol == IPPROTO_UDPLITE) 491 prot = &udplite_prot; 492 493 sock_prot_inuse_add(net, sk->sk_prot, -1); 494 sock_prot_inuse_add(net, prot, 1); 495 496 /* Paired with READ_ONCE(sk->sk_prot) in inet6_dgram_ops */ 497 WRITE_ONCE(sk->sk_prot, prot); 498 sk->sk_socket->ops = &inet_dgram_ops; 499 sk->sk_family = PF_INET; 500 } 501 502 /* Disable all options not to allocate memory anymore, 503 * but there is still a race. See the lockless path 504 * in udpv6_sendmsg() and ipv6_local_rxpmtu(). 505 */ 506 np->rxopt.all = 0; 507 508 inet6_cleanup_sock(sk); 509 510 /* 511 * ... and add it to the refcnt debug socks count 512 * in the new family. -acme 513 */ 514 sk_refcnt_debug_inc(sk); 515 module_put(THIS_MODULE); 516 retv = 0; 517 break; 518 } 519 goto e_inval; 520 521 case IPV6_V6ONLY: 522 if (optlen < sizeof(int) || 523 inet_sk(sk)->inet_num) 524 goto e_inval; 525 sk->sk_ipv6only = valbool; 526 retv = 0; 527 break; 528 529 case IPV6_RECVPKTINFO: 530 if (optlen < sizeof(int)) 531 goto e_inval; 532 np->rxopt.bits.rxinfo = valbool; 533 retv = 0; 534 break; 535 536 case IPV6_2292PKTINFO: 537 if (optlen < sizeof(int)) 538 goto e_inval; 539 np->rxopt.bits.rxoinfo = valbool; 540 retv = 0; 541 break; 542 543 case IPV6_RECVHOPLIMIT: 544 if (optlen < sizeof(int)) 545 goto e_inval; 546 np->rxopt.bits.rxhlim = valbool; 547 retv = 0; 548 break; 549 550 case IPV6_2292HOPLIMIT: 551 if (optlen < sizeof(int)) 552 goto e_inval; 553 np->rxopt.bits.rxohlim = valbool; 554 retv = 0; 555 break; 556 557 case IPV6_RECVRTHDR: 558 if (optlen < sizeof(int)) 559 goto e_inval; 560 np->rxopt.bits.srcrt = valbool; 561 retv = 0; 562 break; 563 564 case IPV6_2292RTHDR: 565 if (optlen < sizeof(int)) 566 goto e_inval; 567 np->rxopt.bits.osrcrt = valbool; 568 retv = 0; 569 break; 570 571 case IPV6_RECVHOPOPTS: 572 if (optlen < sizeof(int)) 573 goto e_inval; 574 np->rxopt.bits.hopopts = valbool; 575 retv = 0; 576 break; 577 578 case IPV6_2292HOPOPTS: 579 if (optlen < sizeof(int)) 580 goto e_inval; 581 np->rxopt.bits.ohopopts = valbool; 582 retv = 0; 583 break; 584 585 case IPV6_RECVDSTOPTS: 586 if (optlen < sizeof(int)) 587 goto e_inval; 588 np->rxopt.bits.dstopts = valbool; 589 retv = 0; 590 break; 591 592 case IPV6_2292DSTOPTS: 593 if (optlen < sizeof(int)) 594 goto e_inval; 595 np->rxopt.bits.odstopts = valbool; 596 retv = 0; 597 break; 598 599 case IPV6_TCLASS: 600 if (optlen < sizeof(int)) 601 goto e_inval; 602 if (val < -1 || val > 0xff) 603 goto e_inval; 604 /* RFC 3542, 6.5: default traffic class of 0x0 */ 605 if (val == -1) 606 val = 0; 607 if (sk->sk_type == SOCK_STREAM) { 608 val &= ~INET_ECN_MASK; 609 val |= np->tclass & INET_ECN_MASK; 610 } 611 if (np->tclass != val) { 612 np->tclass = val; 613 sk_dst_reset(sk); 614 } 615 retv = 0; 616 break; 617 618 case IPV6_RECVTCLASS: 619 if (optlen < sizeof(int)) 620 goto e_inval; 621 np->rxopt.bits.rxtclass = valbool; 622 retv = 0; 623 break; 624 625 case IPV6_FLOWINFO: 626 if (optlen < sizeof(int)) 627 goto e_inval; 628 np->rxopt.bits.rxflow = valbool; 629 retv = 0; 630 break; 631 632 case IPV6_RECVPATHMTU: 633 if (optlen < sizeof(int)) 634 goto e_inval; 635 np->rxopt.bits.rxpmtu = valbool; 636 retv = 0; 637 break; 638 639 case IPV6_TRANSPARENT: 640 if (valbool && !sockopt_ns_capable(net->user_ns, CAP_NET_RAW) && 641 !sockopt_ns_capable(net->user_ns, CAP_NET_ADMIN)) { 642 retv = -EPERM; 643 break; 644 } 645 if (optlen < sizeof(int)) 646 goto e_inval; 647 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */ 648 inet_sk(sk)->transparent = valbool; 649 retv = 0; 650 break; 651 652 case IPV6_FREEBIND: 653 if (optlen < sizeof(int)) 654 goto e_inval; 655 /* we also don't have a separate freebind bit for IPV6 */ 656 inet_sk(sk)->freebind = valbool; 657 retv = 0; 658 break; 659 660 case IPV6_RECVORIGDSTADDR: 661 if (optlen < sizeof(int)) 662 goto e_inval; 663 np->rxopt.bits.rxorigdstaddr = valbool; 664 retv = 0; 665 break; 666 667 case IPV6_HOPOPTS: 668 case IPV6_RTHDRDSTOPTS: 669 case IPV6_RTHDR: 670 case IPV6_DSTOPTS: 671 retv = ipv6_set_opt_hdr(sk, optname, optval, optlen); 672 break; 673 674 case IPV6_PKTINFO: 675 { 676 struct in6_pktinfo pkt; 677 678 if (optlen == 0) 679 goto e_inval; 680 else if (optlen < sizeof(struct in6_pktinfo) || 681 sockptr_is_null(optval)) 682 goto e_inval; 683 684 if (copy_from_sockptr(&pkt, optval, sizeof(pkt))) { 685 retv = -EFAULT; 686 break; 687 } 688 if (!sk_dev_equal_l3scope(sk, pkt.ipi6_ifindex)) 689 goto e_inval; 690 691 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex; 692 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr; 693 retv = 0; 694 break; 695 } 696 697 case IPV6_2292PKTOPTIONS: 698 { 699 struct ipv6_txoptions *opt = NULL; 700 struct msghdr msg; 701 struct flowi6 fl6; 702 struct ipcm6_cookie ipc6; 703 704 memset(&fl6, 0, sizeof(fl6)); 705 fl6.flowi6_oif = sk->sk_bound_dev_if; 706 fl6.flowi6_mark = sk->sk_mark; 707 708 if (optlen == 0) 709 goto update; 710 711 /* 1K is probably excessive 712 * 1K is surely not enough, 2K per standard header is 16K. 713 */ 714 retv = -EINVAL; 715 if (optlen > 64*1024) 716 break; 717 718 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL); 719 retv = -ENOBUFS; 720 if (!opt) 721 break; 722 723 memset(opt, 0, sizeof(*opt)); 724 refcount_set(&opt->refcnt, 1); 725 opt->tot_len = sizeof(*opt) + optlen; 726 retv = -EFAULT; 727 if (copy_from_sockptr(opt + 1, optval, optlen)) 728 goto done; 729 730 msg.msg_controllen = optlen; 731 msg.msg_control = (void *)(opt+1); 732 ipc6.opt = opt; 733 734 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6); 735 if (retv) 736 goto done; 737 update: 738 retv = 0; 739 opt = ipv6_update_options(sk, opt); 740 done: 741 if (opt) { 742 atomic_sub(opt->tot_len, &sk->sk_omem_alloc); 743 txopt_put(opt); 744 } 745 break; 746 } 747 case IPV6_UNICAST_HOPS: 748 if (optlen < sizeof(int)) 749 goto e_inval; 750 if (val > 255 || val < -1) 751 goto e_inval; 752 np->hop_limit = val; 753 retv = 0; 754 break; 755 756 case IPV6_MULTICAST_HOPS: 757 if (sk->sk_type == SOCK_STREAM) 758 break; 759 if (optlen < sizeof(int)) 760 goto e_inval; 761 if (val > 255 || val < -1) 762 goto e_inval; 763 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val); 764 retv = 0; 765 break; 766 767 case IPV6_MULTICAST_LOOP: 768 if (optlen < sizeof(int)) 769 goto e_inval; 770 if (val != valbool) 771 goto e_inval; 772 np->mc_loop = valbool; 773 retv = 0; 774 break; 775 776 case IPV6_UNICAST_IF: 777 { 778 struct net_device *dev = NULL; 779 int ifindex; 780 781 if (optlen != sizeof(int)) 782 goto e_inval; 783 784 ifindex = (__force int)ntohl((__force __be32)val); 785 if (ifindex == 0) { 786 np->ucast_oif = 0; 787 retv = 0; 788 break; 789 } 790 791 dev = dev_get_by_index(net, ifindex); 792 retv = -EADDRNOTAVAIL; 793 if (!dev) 794 break; 795 dev_put(dev); 796 797 retv = -EINVAL; 798 if (sk->sk_bound_dev_if) 799 break; 800 801 np->ucast_oif = ifindex; 802 retv = 0; 803 break; 804 } 805 806 case IPV6_MULTICAST_IF: 807 if (sk->sk_type == SOCK_STREAM) 808 break; 809 if (optlen < sizeof(int)) 810 goto e_inval; 811 812 if (val) { 813 struct net_device *dev; 814 int midx; 815 816 rcu_read_lock(); 817 818 dev = dev_get_by_index_rcu(net, val); 819 if (!dev) { 820 rcu_read_unlock(); 821 retv = -ENODEV; 822 break; 823 } 824 midx = l3mdev_master_ifindex_rcu(dev); 825 826 rcu_read_unlock(); 827 828 if (sk->sk_bound_dev_if && 829 sk->sk_bound_dev_if != val && 830 (!midx || midx != sk->sk_bound_dev_if)) 831 goto e_inval; 832 } 833 np->mcast_oif = val; 834 retv = 0; 835 break; 836 case IPV6_ADD_MEMBERSHIP: 837 case IPV6_DROP_MEMBERSHIP: 838 { 839 struct ipv6_mreq mreq; 840 841 if (optlen < sizeof(struct ipv6_mreq)) 842 goto e_inval; 843 844 retv = -EPROTO; 845 if (inet_sk(sk)->is_icsk) 846 break; 847 848 retv = -EFAULT; 849 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq))) 850 break; 851 852 if (optname == IPV6_ADD_MEMBERSHIP) 853 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr); 854 else 855 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr); 856 break; 857 } 858 case IPV6_JOIN_ANYCAST: 859 case IPV6_LEAVE_ANYCAST: 860 { 861 struct ipv6_mreq mreq; 862 863 if (optlen < sizeof(struct ipv6_mreq)) 864 goto e_inval; 865 866 retv = -EFAULT; 867 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq))) 868 break; 869 870 if (optname == IPV6_JOIN_ANYCAST) 871 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr); 872 else 873 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr); 874 break; 875 } 876 case IPV6_MULTICAST_ALL: 877 if (optlen < sizeof(int)) 878 goto e_inval; 879 np->mc_all = valbool; 880 retv = 0; 881 break; 882 883 case MCAST_JOIN_GROUP: 884 case MCAST_LEAVE_GROUP: 885 if (in_compat_syscall()) 886 retv = compat_ipv6_mcast_join_leave(sk, optname, optval, 887 optlen); 888 else 889 retv = ipv6_mcast_join_leave(sk, optname, optval, 890 optlen); 891 break; 892 case MCAST_JOIN_SOURCE_GROUP: 893 case MCAST_LEAVE_SOURCE_GROUP: 894 case MCAST_BLOCK_SOURCE: 895 case MCAST_UNBLOCK_SOURCE: 896 retv = do_ipv6_mcast_group_source(sk, optname, optval, optlen); 897 break; 898 case MCAST_MSFILTER: 899 if (in_compat_syscall()) 900 retv = compat_ipv6_set_mcast_msfilter(sk, optval, 901 optlen); 902 else 903 retv = ipv6_set_mcast_msfilter(sk, optval, optlen); 904 break; 905 case IPV6_ROUTER_ALERT: 906 if (optlen < sizeof(int)) 907 goto e_inval; 908 retv = ip6_ra_control(sk, val); 909 break; 910 case IPV6_ROUTER_ALERT_ISOLATE: 911 if (optlen < sizeof(int)) 912 goto e_inval; 913 np->rtalert_isolate = valbool; 914 retv = 0; 915 break; 916 case IPV6_MTU_DISCOVER: 917 if (optlen < sizeof(int)) 918 goto e_inval; 919 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT) 920 goto e_inval; 921 np->pmtudisc = val; 922 retv = 0; 923 break; 924 case IPV6_MTU: 925 if (optlen < sizeof(int)) 926 goto e_inval; 927 if (val && val < IPV6_MIN_MTU) 928 goto e_inval; 929 np->frag_size = val; 930 retv = 0; 931 break; 932 case IPV6_RECVERR: 933 if (optlen < sizeof(int)) 934 goto e_inval; 935 np->recverr = valbool; 936 if (!val) 937 skb_queue_purge(&sk->sk_error_queue); 938 retv = 0; 939 break; 940 case IPV6_FLOWINFO_SEND: 941 if (optlen < sizeof(int)) 942 goto e_inval; 943 np->sndflow = valbool; 944 retv = 0; 945 break; 946 case IPV6_FLOWLABEL_MGR: 947 retv = ipv6_flowlabel_opt(sk, optval, optlen); 948 break; 949 case IPV6_IPSEC_POLICY: 950 case IPV6_XFRM_POLICY: 951 retv = -EPERM; 952 if (!sockopt_ns_capable(net->user_ns, CAP_NET_ADMIN)) 953 break; 954 retv = xfrm_user_policy(sk, optname, optval, optlen); 955 break; 956 957 case IPV6_ADDR_PREFERENCES: 958 if (optlen < sizeof(int)) 959 goto e_inval; 960 retv = __ip6_sock_set_addr_preferences(sk, val); 961 break; 962 case IPV6_MINHOPCOUNT: 963 if (optlen < sizeof(int)) 964 goto e_inval; 965 if (val < 0 || val > 255) 966 goto e_inval; 967 968 if (val) 969 static_branch_enable(&ip6_min_hopcount); 970 971 /* tcp_v6_err() and tcp_v6_rcv() might read min_hopcount 972 * while we are changing it. 973 */ 974 WRITE_ONCE(np->min_hopcount, val); 975 retv = 0; 976 break; 977 case IPV6_DONTFRAG: 978 np->dontfrag = valbool; 979 retv = 0; 980 break; 981 case IPV6_AUTOFLOWLABEL: 982 np->autoflowlabel = valbool; 983 np->autoflowlabel_set = 1; 984 retv = 0; 985 break; 986 case IPV6_RECVFRAGSIZE: 987 np->rxopt.bits.recvfragsize = valbool; 988 retv = 0; 989 break; 990 case IPV6_RECVERR_RFC4884: 991 if (optlen < sizeof(int)) 992 goto e_inval; 993 if (val < 0 || val > 1) 994 goto e_inval; 995 np->recverr_rfc4884 = valbool; 996 retv = 0; 997 break; 998 } 999 1000 unlock: 1001 sockopt_release_sock(sk); 1002 if (needs_rtnl) 1003 rtnl_unlock(); 1004 1005 return retv; 1006 1007 e_inval: 1008 retv = -EINVAL; 1009 goto unlock; 1010 } 1011 1012 int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, 1013 unsigned int optlen) 1014 { 1015 int err; 1016 1017 if (level == SOL_IP && sk->sk_type != SOCK_RAW) 1018 return udp_prot.setsockopt(sk, level, optname, optval, optlen); 1019 1020 if (level != SOL_IPV6) 1021 return -ENOPROTOOPT; 1022 1023 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen); 1024 #ifdef CONFIG_NETFILTER 1025 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1026 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY && 1027 optname != IPV6_XFRM_POLICY) 1028 err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen); 1029 #endif 1030 return err; 1031 } 1032 EXPORT_SYMBOL(ipv6_setsockopt); 1033 1034 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt, 1035 int optname, sockptr_t optval, int len) 1036 { 1037 struct ipv6_opt_hdr *hdr; 1038 1039 if (!opt) 1040 return 0; 1041 1042 switch (optname) { 1043 case IPV6_HOPOPTS: 1044 hdr = opt->hopopt; 1045 break; 1046 case IPV6_RTHDRDSTOPTS: 1047 hdr = opt->dst0opt; 1048 break; 1049 case IPV6_RTHDR: 1050 hdr = (struct ipv6_opt_hdr *)opt->srcrt; 1051 break; 1052 case IPV6_DSTOPTS: 1053 hdr = opt->dst1opt; 1054 break; 1055 default: 1056 return -EINVAL; /* should not happen */ 1057 } 1058 1059 if (!hdr) 1060 return 0; 1061 1062 len = min_t(unsigned int, len, ipv6_optlen(hdr)); 1063 if (copy_to_sockptr(optval, hdr, len)) 1064 return -EFAULT; 1065 return len; 1066 } 1067 1068 static int ipv6_get_msfilter(struct sock *sk, sockptr_t optval, 1069 sockptr_t optlen, int len) 1070 { 1071 const int size0 = offsetof(struct group_filter, gf_slist_flex); 1072 struct group_filter gsf; 1073 int num; 1074 int err; 1075 1076 if (len < size0) 1077 return -EINVAL; 1078 if (copy_from_sockptr(&gsf, optval, size0)) 1079 return -EFAULT; 1080 if (gsf.gf_group.ss_family != AF_INET6) 1081 return -EADDRNOTAVAIL; 1082 num = gsf.gf_numsrc; 1083 sockopt_lock_sock(sk); 1084 err = ip6_mc_msfget(sk, &gsf, optval, size0); 1085 if (!err) { 1086 if (num > gsf.gf_numsrc) 1087 num = gsf.gf_numsrc; 1088 len = GROUP_FILTER_SIZE(num); 1089 if (copy_to_sockptr(optlen, &len, sizeof(int)) || 1090 copy_to_sockptr(optval, &gsf, size0)) 1091 err = -EFAULT; 1092 } 1093 sockopt_release_sock(sk); 1094 return err; 1095 } 1096 1097 static int compat_ipv6_get_msfilter(struct sock *sk, sockptr_t optval, 1098 sockptr_t optlen, int len) 1099 { 1100 const int size0 = offsetof(struct compat_group_filter, gf_slist_flex); 1101 struct compat_group_filter gf32; 1102 struct group_filter gf; 1103 int err; 1104 int num; 1105 1106 if (len < size0) 1107 return -EINVAL; 1108 1109 if (copy_from_sockptr(&gf32, optval, size0)) 1110 return -EFAULT; 1111 gf.gf_interface = gf32.gf_interface; 1112 gf.gf_fmode = gf32.gf_fmode; 1113 num = gf.gf_numsrc = gf32.gf_numsrc; 1114 gf.gf_group = gf32.gf_group; 1115 1116 if (gf.gf_group.ss_family != AF_INET6) 1117 return -EADDRNOTAVAIL; 1118 1119 sockopt_lock_sock(sk); 1120 err = ip6_mc_msfget(sk, &gf, optval, size0); 1121 sockopt_release_sock(sk); 1122 if (err) 1123 return err; 1124 if (num > gf.gf_numsrc) 1125 num = gf.gf_numsrc; 1126 len = GROUP_FILTER_SIZE(num) - (sizeof(gf)-sizeof(gf32)); 1127 if (copy_to_sockptr(optlen, &len, sizeof(int)) || 1128 copy_to_sockptr_offset(optval, offsetof(struct compat_group_filter, gf_fmode), 1129 &gf.gf_fmode, sizeof(gf32.gf_fmode)) || 1130 copy_to_sockptr_offset(optval, offsetof(struct compat_group_filter, gf_numsrc), 1131 &gf.gf_numsrc, sizeof(gf32.gf_numsrc))) 1132 return -EFAULT; 1133 return 0; 1134 } 1135 1136 int do_ipv6_getsockopt(struct sock *sk, int level, int optname, 1137 sockptr_t optval, sockptr_t optlen) 1138 { 1139 struct ipv6_pinfo *np = inet6_sk(sk); 1140 int len; 1141 int val; 1142 1143 if (ip6_mroute_opt(optname)) 1144 return ip6_mroute_getsockopt(sk, optname, optval, optlen); 1145 1146 if (copy_from_sockptr(&len, optlen, sizeof(int))) 1147 return -EFAULT; 1148 switch (optname) { 1149 case IPV6_ADDRFORM: 1150 if (sk->sk_protocol != IPPROTO_UDP && 1151 sk->sk_protocol != IPPROTO_UDPLITE && 1152 sk->sk_protocol != IPPROTO_TCP) 1153 return -ENOPROTOOPT; 1154 if (sk->sk_state != TCP_ESTABLISHED) 1155 return -ENOTCONN; 1156 val = sk->sk_family; 1157 break; 1158 case MCAST_MSFILTER: 1159 if (in_compat_syscall()) 1160 return compat_ipv6_get_msfilter(sk, optval, optlen, len); 1161 return ipv6_get_msfilter(sk, optval, optlen, len); 1162 case IPV6_2292PKTOPTIONS: 1163 { 1164 struct msghdr msg; 1165 struct sk_buff *skb; 1166 1167 if (sk->sk_type != SOCK_STREAM) 1168 return -ENOPROTOOPT; 1169 1170 if (optval.is_kernel) { 1171 msg.msg_control_is_user = false; 1172 msg.msg_control = optval.kernel; 1173 } else { 1174 msg.msg_control_is_user = true; 1175 msg.msg_control_user = optval.user; 1176 } 1177 msg.msg_controllen = len; 1178 msg.msg_flags = 0; 1179 1180 sockopt_lock_sock(sk); 1181 skb = np->pktoptions; 1182 if (skb) 1183 ip6_datagram_recv_ctl(sk, &msg, skb); 1184 sockopt_release_sock(sk); 1185 if (!skb) { 1186 if (np->rxopt.bits.rxinfo) { 1187 struct in6_pktinfo src_info; 1188 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif : 1189 np->sticky_pktinfo.ipi6_ifindex; 1190 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr; 1191 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info); 1192 } 1193 if (np->rxopt.bits.rxhlim) { 1194 int hlim = np->mcast_hops; 1195 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); 1196 } 1197 if (np->rxopt.bits.rxtclass) { 1198 int tclass = (int)ip6_tclass(np->rcv_flowinfo); 1199 1200 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass); 1201 } 1202 if (np->rxopt.bits.rxoinfo) { 1203 struct in6_pktinfo src_info; 1204 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif : 1205 np->sticky_pktinfo.ipi6_ifindex; 1206 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : 1207 np->sticky_pktinfo.ipi6_addr; 1208 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); 1209 } 1210 if (np->rxopt.bits.rxohlim) { 1211 int hlim = np->mcast_hops; 1212 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); 1213 } 1214 if (np->rxopt.bits.rxflow) { 1215 __be32 flowinfo = np->rcv_flowinfo; 1216 1217 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo); 1218 } 1219 } 1220 len -= msg.msg_controllen; 1221 return copy_to_sockptr(optlen, &len, sizeof(int)); 1222 } 1223 case IPV6_MTU: 1224 { 1225 struct dst_entry *dst; 1226 1227 val = 0; 1228 rcu_read_lock(); 1229 dst = __sk_dst_get(sk); 1230 if (dst) 1231 val = dst_mtu(dst); 1232 rcu_read_unlock(); 1233 if (!val) 1234 return -ENOTCONN; 1235 break; 1236 } 1237 1238 case IPV6_V6ONLY: 1239 val = sk->sk_ipv6only; 1240 break; 1241 1242 case IPV6_RECVPKTINFO: 1243 val = np->rxopt.bits.rxinfo; 1244 break; 1245 1246 case IPV6_2292PKTINFO: 1247 val = np->rxopt.bits.rxoinfo; 1248 break; 1249 1250 case IPV6_RECVHOPLIMIT: 1251 val = np->rxopt.bits.rxhlim; 1252 break; 1253 1254 case IPV6_2292HOPLIMIT: 1255 val = np->rxopt.bits.rxohlim; 1256 break; 1257 1258 case IPV6_RECVRTHDR: 1259 val = np->rxopt.bits.srcrt; 1260 break; 1261 1262 case IPV6_2292RTHDR: 1263 val = np->rxopt.bits.osrcrt; 1264 break; 1265 1266 case IPV6_HOPOPTS: 1267 case IPV6_RTHDRDSTOPTS: 1268 case IPV6_RTHDR: 1269 case IPV6_DSTOPTS: 1270 { 1271 struct ipv6_txoptions *opt; 1272 1273 sockopt_lock_sock(sk); 1274 opt = rcu_dereference_protected(np->opt, 1275 lockdep_sock_is_held(sk)); 1276 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len); 1277 sockopt_release_sock(sk); 1278 /* check if ipv6_getsockopt_sticky() returns err code */ 1279 if (len < 0) 1280 return len; 1281 return copy_to_sockptr(optlen, &len, sizeof(int)); 1282 } 1283 1284 case IPV6_RECVHOPOPTS: 1285 val = np->rxopt.bits.hopopts; 1286 break; 1287 1288 case IPV6_2292HOPOPTS: 1289 val = np->rxopt.bits.ohopopts; 1290 break; 1291 1292 case IPV6_RECVDSTOPTS: 1293 val = np->rxopt.bits.dstopts; 1294 break; 1295 1296 case IPV6_2292DSTOPTS: 1297 val = np->rxopt.bits.odstopts; 1298 break; 1299 1300 case IPV6_TCLASS: 1301 val = np->tclass; 1302 break; 1303 1304 case IPV6_RECVTCLASS: 1305 val = np->rxopt.bits.rxtclass; 1306 break; 1307 1308 case IPV6_FLOWINFO: 1309 val = np->rxopt.bits.rxflow; 1310 break; 1311 1312 case IPV6_RECVPATHMTU: 1313 val = np->rxopt.bits.rxpmtu; 1314 break; 1315 1316 case IPV6_PATHMTU: 1317 { 1318 struct dst_entry *dst; 1319 struct ip6_mtuinfo mtuinfo; 1320 1321 if (len < sizeof(mtuinfo)) 1322 return -EINVAL; 1323 1324 len = sizeof(mtuinfo); 1325 memset(&mtuinfo, 0, sizeof(mtuinfo)); 1326 1327 rcu_read_lock(); 1328 dst = __sk_dst_get(sk); 1329 if (dst) 1330 mtuinfo.ip6m_mtu = dst_mtu(dst); 1331 rcu_read_unlock(); 1332 if (!mtuinfo.ip6m_mtu) 1333 return -ENOTCONN; 1334 1335 if (copy_to_sockptr(optlen, &len, sizeof(int))) 1336 return -EFAULT; 1337 if (copy_to_sockptr(optval, &mtuinfo, len)) 1338 return -EFAULT; 1339 1340 return 0; 1341 } 1342 1343 case IPV6_TRANSPARENT: 1344 val = inet_sk(sk)->transparent; 1345 break; 1346 1347 case IPV6_FREEBIND: 1348 val = inet_sk(sk)->freebind; 1349 break; 1350 1351 case IPV6_RECVORIGDSTADDR: 1352 val = np->rxopt.bits.rxorigdstaddr; 1353 break; 1354 1355 case IPV6_UNICAST_HOPS: 1356 case IPV6_MULTICAST_HOPS: 1357 { 1358 struct dst_entry *dst; 1359 1360 if (optname == IPV6_UNICAST_HOPS) 1361 val = np->hop_limit; 1362 else 1363 val = np->mcast_hops; 1364 1365 if (val < 0) { 1366 rcu_read_lock(); 1367 dst = __sk_dst_get(sk); 1368 if (dst) 1369 val = ip6_dst_hoplimit(dst); 1370 rcu_read_unlock(); 1371 } 1372 1373 if (val < 0) 1374 val = sock_net(sk)->ipv6.devconf_all->hop_limit; 1375 break; 1376 } 1377 1378 case IPV6_MULTICAST_LOOP: 1379 val = np->mc_loop; 1380 break; 1381 1382 case IPV6_MULTICAST_IF: 1383 val = np->mcast_oif; 1384 break; 1385 1386 case IPV6_MULTICAST_ALL: 1387 val = np->mc_all; 1388 break; 1389 1390 case IPV6_UNICAST_IF: 1391 val = (__force int)htonl((__u32) np->ucast_oif); 1392 break; 1393 1394 case IPV6_MTU_DISCOVER: 1395 val = np->pmtudisc; 1396 break; 1397 1398 case IPV6_RECVERR: 1399 val = np->recverr; 1400 break; 1401 1402 case IPV6_FLOWINFO_SEND: 1403 val = np->sndflow; 1404 break; 1405 1406 case IPV6_FLOWLABEL_MGR: 1407 { 1408 struct in6_flowlabel_req freq; 1409 int flags; 1410 1411 if (len < sizeof(freq)) 1412 return -EINVAL; 1413 1414 if (copy_from_sockptr(&freq, optval, sizeof(freq))) 1415 return -EFAULT; 1416 1417 if (freq.flr_action != IPV6_FL_A_GET) 1418 return -EINVAL; 1419 1420 len = sizeof(freq); 1421 flags = freq.flr_flags; 1422 1423 memset(&freq, 0, sizeof(freq)); 1424 1425 val = ipv6_flowlabel_opt_get(sk, &freq, flags); 1426 if (val < 0) 1427 return val; 1428 1429 if (copy_to_sockptr(optlen, &len, sizeof(int))) 1430 return -EFAULT; 1431 if (copy_to_sockptr(optval, &freq, len)) 1432 return -EFAULT; 1433 1434 return 0; 1435 } 1436 1437 case IPV6_ADDR_PREFERENCES: 1438 val = 0; 1439 1440 if (np->srcprefs & IPV6_PREFER_SRC_TMP) 1441 val |= IPV6_PREFER_SRC_TMP; 1442 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC) 1443 val |= IPV6_PREFER_SRC_PUBLIC; 1444 else { 1445 /* XXX: should we return system default? */ 1446 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT; 1447 } 1448 1449 if (np->srcprefs & IPV6_PREFER_SRC_COA) 1450 val |= IPV6_PREFER_SRC_COA; 1451 else 1452 val |= IPV6_PREFER_SRC_HOME; 1453 break; 1454 1455 case IPV6_MINHOPCOUNT: 1456 val = np->min_hopcount; 1457 break; 1458 1459 case IPV6_DONTFRAG: 1460 val = np->dontfrag; 1461 break; 1462 1463 case IPV6_AUTOFLOWLABEL: 1464 val = ip6_autoflowlabel(sock_net(sk), np); 1465 break; 1466 1467 case IPV6_RECVFRAGSIZE: 1468 val = np->rxopt.bits.recvfragsize; 1469 break; 1470 1471 case IPV6_ROUTER_ALERT_ISOLATE: 1472 val = np->rtalert_isolate; 1473 break; 1474 1475 case IPV6_RECVERR_RFC4884: 1476 val = np->recverr_rfc4884; 1477 break; 1478 1479 default: 1480 return -ENOPROTOOPT; 1481 } 1482 len = min_t(unsigned int, sizeof(int), len); 1483 if (copy_to_sockptr(optlen, &len, sizeof(int))) 1484 return -EFAULT; 1485 if (copy_to_sockptr(optval, &val, len)) 1486 return -EFAULT; 1487 return 0; 1488 } 1489 1490 int ipv6_getsockopt(struct sock *sk, int level, int optname, 1491 char __user *optval, int __user *optlen) 1492 { 1493 int err; 1494 1495 if (level == SOL_IP && sk->sk_type != SOCK_RAW) 1496 return udp_prot.getsockopt(sk, level, optname, optval, optlen); 1497 1498 if (level != SOL_IPV6) 1499 return -ENOPROTOOPT; 1500 1501 err = do_ipv6_getsockopt(sk, level, optname, 1502 USER_SOCKPTR(optval), USER_SOCKPTR(optlen)); 1503 #ifdef CONFIG_NETFILTER 1504 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1505 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) { 1506 int len; 1507 1508 if (get_user(len, optlen)) 1509 return -EFAULT; 1510 1511 err = nf_getsockopt(sk, PF_INET6, optname, optval, &len); 1512 if (err >= 0) 1513 err = put_user(len, optlen); 1514 } 1515 #endif 1516 return err; 1517 } 1518 EXPORT_SYMBOL(ipv6_getsockopt); 1519