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_test_bit(IS_ICSK, sk)) { 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 /* Handle options that can be set without locking the socket. */ 419 switch (optname) { 420 case IPV6_UNICAST_HOPS: 421 if (optlen < sizeof(int)) 422 return -EINVAL; 423 if (val > 255 || val < -1) 424 return -EINVAL; 425 WRITE_ONCE(np->hop_limit, val); 426 return 0; 427 case IPV6_MULTICAST_LOOP: 428 if (optlen < sizeof(int)) 429 return -EINVAL; 430 if (val != valbool) 431 return -EINVAL; 432 inet6_assign_bit(MC6_LOOP, sk, valbool); 433 return 0; 434 case IPV6_MULTICAST_HOPS: 435 if (sk->sk_type == SOCK_STREAM) 436 return retv; 437 if (optlen < sizeof(int)) 438 return -EINVAL; 439 if (val > 255 || val < -1) 440 return -EINVAL; 441 WRITE_ONCE(np->mcast_hops, 442 val == -1 ? IPV6_DEFAULT_MCASTHOPS : val); 443 return 0; 444 case IPV6_MTU: 445 if (optlen < sizeof(int)) 446 return -EINVAL; 447 if (val && val < IPV6_MIN_MTU) 448 return -EINVAL; 449 WRITE_ONCE(np->frag_size, val); 450 return 0; 451 case IPV6_MINHOPCOUNT: 452 if (optlen < sizeof(int)) 453 return -EINVAL; 454 if (val < 0 || val > 255) 455 return -EINVAL; 456 457 if (val) 458 static_branch_enable(&ip6_min_hopcount); 459 460 /* tcp_v6_err() and tcp_v6_rcv() might read min_hopcount 461 * while we are changing it. 462 */ 463 WRITE_ONCE(np->min_hopcount, val); 464 return 0; 465 case IPV6_RECVERR_RFC4884: 466 if (optlen < sizeof(int)) 467 return -EINVAL; 468 if (val < 0 || val > 1) 469 return -EINVAL; 470 inet6_assign_bit(RECVERR6_RFC4884, sk, valbool); 471 return 0; 472 case IPV6_MULTICAST_ALL: 473 if (optlen < sizeof(int)) 474 return -EINVAL; 475 inet6_assign_bit(MC6_ALL, sk, valbool); 476 return 0; 477 case IPV6_AUTOFLOWLABEL: 478 inet6_assign_bit(AUTOFLOWLABEL, sk, valbool); 479 inet6_set_bit(AUTOFLOWLABEL_SET, sk); 480 return 0; 481 case IPV6_DONTFRAG: 482 inet6_assign_bit(DONTFRAG, sk, valbool); 483 return 0; 484 case IPV6_RECVERR: 485 if (optlen < sizeof(int)) 486 return -EINVAL; 487 inet6_assign_bit(RECVERR6, sk, valbool); 488 if (!val) 489 skb_errqueue_purge(&sk->sk_error_queue); 490 return 0; 491 case IPV6_ROUTER_ALERT_ISOLATE: 492 if (optlen < sizeof(int)) 493 return -EINVAL; 494 inet6_assign_bit(RTALERT_ISOLATE, sk, valbool); 495 return 0; 496 } 497 if (needs_rtnl) 498 rtnl_lock(); 499 sockopt_lock_sock(sk); 500 501 /* Another thread has converted the socket into IPv4 with 502 * IPV6_ADDRFORM concurrently. 503 */ 504 if (unlikely(sk->sk_family != AF_INET6)) 505 goto unlock; 506 507 switch (optname) { 508 509 case IPV6_ADDRFORM: 510 if (optlen < sizeof(int)) 511 goto e_inval; 512 if (val == PF_INET) { 513 if (sk->sk_type == SOCK_RAW) 514 break; 515 516 if (sk->sk_protocol == IPPROTO_UDP || 517 sk->sk_protocol == IPPROTO_UDPLITE) { 518 struct udp_sock *up = udp_sk(sk); 519 if (up->pending == AF_INET6) { 520 retv = -EBUSY; 521 break; 522 } 523 } else if (sk->sk_protocol == IPPROTO_TCP) { 524 if (sk->sk_prot != &tcpv6_prot) { 525 retv = -EBUSY; 526 break; 527 } 528 } else { 529 break; 530 } 531 532 if (sk->sk_state != TCP_ESTABLISHED) { 533 retv = -ENOTCONN; 534 break; 535 } 536 537 if (ipv6_only_sock(sk) || 538 !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) { 539 retv = -EADDRNOTAVAIL; 540 break; 541 } 542 543 __ipv6_sock_mc_close(sk); 544 __ipv6_sock_ac_close(sk); 545 546 if (sk->sk_protocol == IPPROTO_TCP) { 547 struct inet_connection_sock *icsk = inet_csk(sk); 548 549 sock_prot_inuse_add(net, sk->sk_prot, -1); 550 sock_prot_inuse_add(net, &tcp_prot, 1); 551 552 /* Paired with READ_ONCE(sk->sk_prot) in inet6_stream_ops */ 553 WRITE_ONCE(sk->sk_prot, &tcp_prot); 554 /* Paired with READ_ONCE() in tcp_(get|set)sockopt() */ 555 WRITE_ONCE(icsk->icsk_af_ops, &ipv4_specific); 556 WRITE_ONCE(sk->sk_socket->ops, &inet_stream_ops); 557 WRITE_ONCE(sk->sk_family, PF_INET); 558 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie); 559 } else { 560 struct proto *prot = &udp_prot; 561 562 if (sk->sk_protocol == IPPROTO_UDPLITE) 563 prot = &udplite_prot; 564 565 sock_prot_inuse_add(net, sk->sk_prot, -1); 566 sock_prot_inuse_add(net, prot, 1); 567 568 /* Paired with READ_ONCE(sk->sk_prot) in inet6_dgram_ops */ 569 WRITE_ONCE(sk->sk_prot, prot); 570 WRITE_ONCE(sk->sk_socket->ops, &inet_dgram_ops); 571 WRITE_ONCE(sk->sk_family, PF_INET); 572 } 573 574 /* Disable all options not to allocate memory anymore, 575 * but there is still a race. See the lockless path 576 * in udpv6_sendmsg() and ipv6_local_rxpmtu(). 577 */ 578 np->rxopt.all = 0; 579 580 inet6_cleanup_sock(sk); 581 582 module_put(THIS_MODULE); 583 retv = 0; 584 break; 585 } 586 goto e_inval; 587 588 case IPV6_V6ONLY: 589 if (optlen < sizeof(int) || 590 inet_sk(sk)->inet_num) 591 goto e_inval; 592 sk->sk_ipv6only = valbool; 593 retv = 0; 594 break; 595 596 case IPV6_RECVPKTINFO: 597 if (optlen < sizeof(int)) 598 goto e_inval; 599 np->rxopt.bits.rxinfo = valbool; 600 retv = 0; 601 break; 602 603 case IPV6_2292PKTINFO: 604 if (optlen < sizeof(int)) 605 goto e_inval; 606 np->rxopt.bits.rxoinfo = valbool; 607 retv = 0; 608 break; 609 610 case IPV6_RECVHOPLIMIT: 611 if (optlen < sizeof(int)) 612 goto e_inval; 613 np->rxopt.bits.rxhlim = valbool; 614 retv = 0; 615 break; 616 617 case IPV6_2292HOPLIMIT: 618 if (optlen < sizeof(int)) 619 goto e_inval; 620 np->rxopt.bits.rxohlim = valbool; 621 retv = 0; 622 break; 623 624 case IPV6_RECVRTHDR: 625 if (optlen < sizeof(int)) 626 goto e_inval; 627 np->rxopt.bits.srcrt = valbool; 628 retv = 0; 629 break; 630 631 case IPV6_2292RTHDR: 632 if (optlen < sizeof(int)) 633 goto e_inval; 634 np->rxopt.bits.osrcrt = valbool; 635 retv = 0; 636 break; 637 638 case IPV6_RECVHOPOPTS: 639 if (optlen < sizeof(int)) 640 goto e_inval; 641 np->rxopt.bits.hopopts = valbool; 642 retv = 0; 643 break; 644 645 case IPV6_2292HOPOPTS: 646 if (optlen < sizeof(int)) 647 goto e_inval; 648 np->rxopt.bits.ohopopts = valbool; 649 retv = 0; 650 break; 651 652 case IPV6_RECVDSTOPTS: 653 if (optlen < sizeof(int)) 654 goto e_inval; 655 np->rxopt.bits.dstopts = valbool; 656 retv = 0; 657 break; 658 659 case IPV6_2292DSTOPTS: 660 if (optlen < sizeof(int)) 661 goto e_inval; 662 np->rxopt.bits.odstopts = valbool; 663 retv = 0; 664 break; 665 666 case IPV6_TCLASS: 667 if (optlen < sizeof(int)) 668 goto e_inval; 669 if (val < -1 || val > 0xff) 670 goto e_inval; 671 /* RFC 3542, 6.5: default traffic class of 0x0 */ 672 if (val == -1) 673 val = 0; 674 if (sk->sk_type == SOCK_STREAM) { 675 val &= ~INET_ECN_MASK; 676 val |= np->tclass & INET_ECN_MASK; 677 } 678 if (np->tclass != val) { 679 np->tclass = val; 680 sk_dst_reset(sk); 681 } 682 retv = 0; 683 break; 684 685 case IPV6_RECVTCLASS: 686 if (optlen < sizeof(int)) 687 goto e_inval; 688 np->rxopt.bits.rxtclass = valbool; 689 retv = 0; 690 break; 691 692 case IPV6_FLOWINFO: 693 if (optlen < sizeof(int)) 694 goto e_inval; 695 np->rxopt.bits.rxflow = valbool; 696 retv = 0; 697 break; 698 699 case IPV6_RECVPATHMTU: 700 if (optlen < sizeof(int)) 701 goto e_inval; 702 np->rxopt.bits.rxpmtu = valbool; 703 retv = 0; 704 break; 705 706 case IPV6_TRANSPARENT: 707 if (valbool && !sockopt_ns_capable(net->user_ns, CAP_NET_RAW) && 708 !sockopt_ns_capable(net->user_ns, CAP_NET_ADMIN)) { 709 retv = -EPERM; 710 break; 711 } 712 if (optlen < sizeof(int)) 713 goto e_inval; 714 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */ 715 inet_assign_bit(TRANSPARENT, sk, valbool); 716 retv = 0; 717 break; 718 719 case IPV6_FREEBIND: 720 if (optlen < sizeof(int)) 721 goto e_inval; 722 /* we also don't have a separate freebind bit for IPV6 */ 723 inet_assign_bit(FREEBIND, sk, valbool); 724 retv = 0; 725 break; 726 727 case IPV6_RECVORIGDSTADDR: 728 if (optlen < sizeof(int)) 729 goto e_inval; 730 np->rxopt.bits.rxorigdstaddr = valbool; 731 retv = 0; 732 break; 733 734 case IPV6_HOPOPTS: 735 case IPV6_RTHDRDSTOPTS: 736 case IPV6_RTHDR: 737 case IPV6_DSTOPTS: 738 retv = ipv6_set_opt_hdr(sk, optname, optval, optlen); 739 break; 740 741 case IPV6_PKTINFO: 742 { 743 struct in6_pktinfo pkt; 744 745 if (optlen == 0) 746 goto e_inval; 747 else if (optlen < sizeof(struct in6_pktinfo) || 748 sockptr_is_null(optval)) 749 goto e_inval; 750 751 if (copy_from_sockptr(&pkt, optval, sizeof(pkt))) { 752 retv = -EFAULT; 753 break; 754 } 755 if (!sk_dev_equal_l3scope(sk, pkt.ipi6_ifindex)) 756 goto e_inval; 757 758 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex; 759 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr; 760 retv = 0; 761 break; 762 } 763 764 case IPV6_2292PKTOPTIONS: 765 { 766 struct ipv6_txoptions *opt = NULL; 767 struct msghdr msg; 768 struct flowi6 fl6; 769 struct ipcm6_cookie ipc6; 770 771 memset(&fl6, 0, sizeof(fl6)); 772 fl6.flowi6_oif = sk->sk_bound_dev_if; 773 fl6.flowi6_mark = sk->sk_mark; 774 775 if (optlen == 0) 776 goto update; 777 778 /* 1K is probably excessive 779 * 1K is surely not enough, 2K per standard header is 16K. 780 */ 781 retv = -EINVAL; 782 if (optlen > 64*1024) 783 break; 784 785 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL); 786 retv = -ENOBUFS; 787 if (!opt) 788 break; 789 790 memset(opt, 0, sizeof(*opt)); 791 refcount_set(&opt->refcnt, 1); 792 opt->tot_len = sizeof(*opt) + optlen; 793 retv = -EFAULT; 794 if (copy_from_sockptr(opt + 1, optval, optlen)) 795 goto done; 796 797 msg.msg_controllen = optlen; 798 msg.msg_control_is_user = false; 799 msg.msg_control = (void *)(opt+1); 800 ipc6.opt = opt; 801 802 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6); 803 if (retv) 804 goto done; 805 update: 806 retv = 0; 807 opt = ipv6_update_options(sk, opt); 808 done: 809 if (opt) { 810 atomic_sub(opt->tot_len, &sk->sk_omem_alloc); 811 txopt_put(opt); 812 } 813 break; 814 } 815 816 817 case IPV6_UNICAST_IF: 818 { 819 struct net_device *dev = NULL; 820 int ifindex; 821 822 if (optlen != sizeof(int)) 823 goto e_inval; 824 825 ifindex = (__force int)ntohl((__force __be32)val); 826 if (ifindex == 0) { 827 np->ucast_oif = 0; 828 retv = 0; 829 break; 830 } 831 832 dev = dev_get_by_index(net, ifindex); 833 retv = -EADDRNOTAVAIL; 834 if (!dev) 835 break; 836 dev_put(dev); 837 838 retv = -EINVAL; 839 if (sk->sk_bound_dev_if) 840 break; 841 842 np->ucast_oif = ifindex; 843 retv = 0; 844 break; 845 } 846 847 case IPV6_MULTICAST_IF: 848 if (sk->sk_type == SOCK_STREAM) 849 break; 850 if (optlen < sizeof(int)) 851 goto e_inval; 852 853 if (val) { 854 struct net_device *dev; 855 int midx; 856 857 rcu_read_lock(); 858 859 dev = dev_get_by_index_rcu(net, val); 860 if (!dev) { 861 rcu_read_unlock(); 862 retv = -ENODEV; 863 break; 864 } 865 midx = l3mdev_master_ifindex_rcu(dev); 866 867 rcu_read_unlock(); 868 869 if (sk->sk_bound_dev_if && 870 sk->sk_bound_dev_if != val && 871 (!midx || midx != sk->sk_bound_dev_if)) 872 goto e_inval; 873 } 874 np->mcast_oif = val; 875 retv = 0; 876 break; 877 case IPV6_ADD_MEMBERSHIP: 878 case IPV6_DROP_MEMBERSHIP: 879 { 880 struct ipv6_mreq mreq; 881 882 if (optlen < sizeof(struct ipv6_mreq)) 883 goto e_inval; 884 885 retv = -EPROTO; 886 if (inet_test_bit(IS_ICSK, sk)) 887 break; 888 889 retv = -EFAULT; 890 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq))) 891 break; 892 893 if (optname == IPV6_ADD_MEMBERSHIP) 894 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr); 895 else 896 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr); 897 break; 898 } 899 case IPV6_JOIN_ANYCAST: 900 case IPV6_LEAVE_ANYCAST: 901 { 902 struct ipv6_mreq mreq; 903 904 if (optlen < sizeof(struct ipv6_mreq)) 905 goto e_inval; 906 907 retv = -EFAULT; 908 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq))) 909 break; 910 911 if (optname == IPV6_JOIN_ANYCAST) 912 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr); 913 else 914 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr); 915 break; 916 } 917 case MCAST_JOIN_GROUP: 918 case MCAST_LEAVE_GROUP: 919 if (in_compat_syscall()) 920 retv = compat_ipv6_mcast_join_leave(sk, optname, optval, 921 optlen); 922 else 923 retv = ipv6_mcast_join_leave(sk, optname, optval, 924 optlen); 925 break; 926 case MCAST_JOIN_SOURCE_GROUP: 927 case MCAST_LEAVE_SOURCE_GROUP: 928 case MCAST_BLOCK_SOURCE: 929 case MCAST_UNBLOCK_SOURCE: 930 retv = do_ipv6_mcast_group_source(sk, optname, optval, optlen); 931 break; 932 case MCAST_MSFILTER: 933 if (in_compat_syscall()) 934 retv = compat_ipv6_set_mcast_msfilter(sk, optval, 935 optlen); 936 else 937 retv = ipv6_set_mcast_msfilter(sk, optval, optlen); 938 break; 939 case IPV6_ROUTER_ALERT: 940 if (optlen < sizeof(int)) 941 goto e_inval; 942 retv = ip6_ra_control(sk, val); 943 break; 944 case IPV6_MTU_DISCOVER: 945 if (optlen < sizeof(int)) 946 goto e_inval; 947 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT) 948 goto e_inval; 949 np->pmtudisc = val; 950 retv = 0; 951 break; 952 case IPV6_FLOWINFO_SEND: 953 if (optlen < sizeof(int)) 954 goto e_inval; 955 np->sndflow = valbool; 956 retv = 0; 957 break; 958 case IPV6_FLOWLABEL_MGR: 959 retv = ipv6_flowlabel_opt(sk, optval, optlen); 960 break; 961 case IPV6_IPSEC_POLICY: 962 case IPV6_XFRM_POLICY: 963 retv = -EPERM; 964 if (!sockopt_ns_capable(net->user_ns, CAP_NET_ADMIN)) 965 break; 966 retv = xfrm_user_policy(sk, optname, optval, optlen); 967 break; 968 969 case IPV6_ADDR_PREFERENCES: 970 if (optlen < sizeof(int)) 971 goto e_inval; 972 retv = __ip6_sock_set_addr_preferences(sk, val); 973 break; 974 case IPV6_RECVFRAGSIZE: 975 np->rxopt.bits.recvfragsize = valbool; 976 retv = 0; 977 break; 978 } 979 980 unlock: 981 sockopt_release_sock(sk); 982 if (needs_rtnl) 983 rtnl_unlock(); 984 985 return retv; 986 987 e_inval: 988 retv = -EINVAL; 989 goto unlock; 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, sockptr_t 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_sockptr(optval, hdr, len)) 1044 return -EFAULT; 1045 return len; 1046 } 1047 1048 static int ipv6_get_msfilter(struct sock *sk, sockptr_t optval, 1049 sockptr_t optlen, int len) 1050 { 1051 const int size0 = offsetof(struct group_filter, gf_slist_flex); 1052 struct group_filter gsf; 1053 int num; 1054 int err; 1055 1056 if (len < size0) 1057 return -EINVAL; 1058 if (copy_from_sockptr(&gsf, optval, size0)) 1059 return -EFAULT; 1060 if (gsf.gf_group.ss_family != AF_INET6) 1061 return -EADDRNOTAVAIL; 1062 num = gsf.gf_numsrc; 1063 sockopt_lock_sock(sk); 1064 err = ip6_mc_msfget(sk, &gsf, optval, size0); 1065 if (!err) { 1066 if (num > gsf.gf_numsrc) 1067 num = gsf.gf_numsrc; 1068 len = GROUP_FILTER_SIZE(num); 1069 if (copy_to_sockptr(optlen, &len, sizeof(int)) || 1070 copy_to_sockptr(optval, &gsf, size0)) 1071 err = -EFAULT; 1072 } 1073 sockopt_release_sock(sk); 1074 return err; 1075 } 1076 1077 static int compat_ipv6_get_msfilter(struct sock *sk, sockptr_t optval, 1078 sockptr_t optlen, int len) 1079 { 1080 const int size0 = offsetof(struct compat_group_filter, gf_slist_flex); 1081 struct compat_group_filter gf32; 1082 struct group_filter gf; 1083 int err; 1084 int num; 1085 1086 if (len < size0) 1087 return -EINVAL; 1088 1089 if (copy_from_sockptr(&gf32, optval, size0)) 1090 return -EFAULT; 1091 gf.gf_interface = gf32.gf_interface; 1092 gf.gf_fmode = gf32.gf_fmode; 1093 num = gf.gf_numsrc = gf32.gf_numsrc; 1094 gf.gf_group = gf32.gf_group; 1095 1096 if (gf.gf_group.ss_family != AF_INET6) 1097 return -EADDRNOTAVAIL; 1098 1099 sockopt_lock_sock(sk); 1100 err = ip6_mc_msfget(sk, &gf, optval, size0); 1101 sockopt_release_sock(sk); 1102 if (err) 1103 return err; 1104 if (num > gf.gf_numsrc) 1105 num = gf.gf_numsrc; 1106 len = GROUP_FILTER_SIZE(num) - (sizeof(gf)-sizeof(gf32)); 1107 if (copy_to_sockptr(optlen, &len, sizeof(int)) || 1108 copy_to_sockptr_offset(optval, offsetof(struct compat_group_filter, gf_fmode), 1109 &gf.gf_fmode, sizeof(gf32.gf_fmode)) || 1110 copy_to_sockptr_offset(optval, offsetof(struct compat_group_filter, gf_numsrc), 1111 &gf.gf_numsrc, sizeof(gf32.gf_numsrc))) 1112 return -EFAULT; 1113 return 0; 1114 } 1115 1116 int do_ipv6_getsockopt(struct sock *sk, int level, int optname, 1117 sockptr_t optval, sockptr_t optlen) 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 (copy_from_sockptr(&len, optlen, sizeof(int))) 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, len); 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 if (optval.is_kernel) { 1151 msg.msg_control_is_user = false; 1152 msg.msg_control = optval.kernel; 1153 } else { 1154 msg.msg_control_is_user = true; 1155 msg.msg_control_user = optval.user; 1156 } 1157 msg.msg_controllen = len; 1158 msg.msg_flags = 0; 1159 1160 sockopt_lock_sock(sk); 1161 skb = np->pktoptions; 1162 if (skb) 1163 ip6_datagram_recv_ctl(sk, &msg, skb); 1164 sockopt_release_sock(sk); 1165 if (!skb) { 1166 if (np->rxopt.bits.rxinfo) { 1167 struct in6_pktinfo src_info; 1168 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif : 1169 np->sticky_pktinfo.ipi6_ifindex; 1170 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr; 1171 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info); 1172 } 1173 if (np->rxopt.bits.rxhlim) { 1174 int hlim = READ_ONCE(np->mcast_hops); 1175 1176 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); 1177 } 1178 if (np->rxopt.bits.rxtclass) { 1179 int tclass = (int)ip6_tclass(np->rcv_flowinfo); 1180 1181 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass); 1182 } 1183 if (np->rxopt.bits.rxoinfo) { 1184 struct in6_pktinfo src_info; 1185 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif : 1186 np->sticky_pktinfo.ipi6_ifindex; 1187 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : 1188 np->sticky_pktinfo.ipi6_addr; 1189 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); 1190 } 1191 if (np->rxopt.bits.rxohlim) { 1192 int hlim = READ_ONCE(np->mcast_hops); 1193 1194 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); 1195 } 1196 if (np->rxopt.bits.rxflow) { 1197 __be32 flowinfo = np->rcv_flowinfo; 1198 1199 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo); 1200 } 1201 } 1202 len -= msg.msg_controllen; 1203 return copy_to_sockptr(optlen, &len, sizeof(int)); 1204 } 1205 case IPV6_MTU: 1206 { 1207 struct dst_entry *dst; 1208 1209 val = 0; 1210 rcu_read_lock(); 1211 dst = __sk_dst_get(sk); 1212 if (dst) 1213 val = dst_mtu(dst); 1214 rcu_read_unlock(); 1215 if (!val) 1216 return -ENOTCONN; 1217 break; 1218 } 1219 1220 case IPV6_V6ONLY: 1221 val = sk->sk_ipv6only; 1222 break; 1223 1224 case IPV6_RECVPKTINFO: 1225 val = np->rxopt.bits.rxinfo; 1226 break; 1227 1228 case IPV6_2292PKTINFO: 1229 val = np->rxopt.bits.rxoinfo; 1230 break; 1231 1232 case IPV6_RECVHOPLIMIT: 1233 val = np->rxopt.bits.rxhlim; 1234 break; 1235 1236 case IPV6_2292HOPLIMIT: 1237 val = np->rxopt.bits.rxohlim; 1238 break; 1239 1240 case IPV6_RECVRTHDR: 1241 val = np->rxopt.bits.srcrt; 1242 break; 1243 1244 case IPV6_2292RTHDR: 1245 val = np->rxopt.bits.osrcrt; 1246 break; 1247 1248 case IPV6_HOPOPTS: 1249 case IPV6_RTHDRDSTOPTS: 1250 case IPV6_RTHDR: 1251 case IPV6_DSTOPTS: 1252 { 1253 struct ipv6_txoptions *opt; 1254 1255 sockopt_lock_sock(sk); 1256 opt = rcu_dereference_protected(np->opt, 1257 lockdep_sock_is_held(sk)); 1258 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len); 1259 sockopt_release_sock(sk); 1260 /* check if ipv6_getsockopt_sticky() returns err code */ 1261 if (len < 0) 1262 return len; 1263 return copy_to_sockptr(optlen, &len, sizeof(int)); 1264 } 1265 1266 case IPV6_RECVHOPOPTS: 1267 val = np->rxopt.bits.hopopts; 1268 break; 1269 1270 case IPV6_2292HOPOPTS: 1271 val = np->rxopt.bits.ohopopts; 1272 break; 1273 1274 case IPV6_RECVDSTOPTS: 1275 val = np->rxopt.bits.dstopts; 1276 break; 1277 1278 case IPV6_2292DSTOPTS: 1279 val = np->rxopt.bits.odstopts; 1280 break; 1281 1282 case IPV6_TCLASS: 1283 val = np->tclass; 1284 break; 1285 1286 case IPV6_RECVTCLASS: 1287 val = np->rxopt.bits.rxtclass; 1288 break; 1289 1290 case IPV6_FLOWINFO: 1291 val = np->rxopt.bits.rxflow; 1292 break; 1293 1294 case IPV6_RECVPATHMTU: 1295 val = np->rxopt.bits.rxpmtu; 1296 break; 1297 1298 case IPV6_PATHMTU: 1299 { 1300 struct dst_entry *dst; 1301 struct ip6_mtuinfo mtuinfo; 1302 1303 if (len < sizeof(mtuinfo)) 1304 return -EINVAL; 1305 1306 len = sizeof(mtuinfo); 1307 memset(&mtuinfo, 0, sizeof(mtuinfo)); 1308 1309 rcu_read_lock(); 1310 dst = __sk_dst_get(sk); 1311 if (dst) 1312 mtuinfo.ip6m_mtu = dst_mtu(dst); 1313 rcu_read_unlock(); 1314 if (!mtuinfo.ip6m_mtu) 1315 return -ENOTCONN; 1316 1317 if (copy_to_sockptr(optlen, &len, sizeof(int))) 1318 return -EFAULT; 1319 if (copy_to_sockptr(optval, &mtuinfo, len)) 1320 return -EFAULT; 1321 1322 return 0; 1323 } 1324 1325 case IPV6_TRANSPARENT: 1326 val = inet_test_bit(TRANSPARENT, sk); 1327 break; 1328 1329 case IPV6_FREEBIND: 1330 val = inet_test_bit(FREEBIND, sk); 1331 break; 1332 1333 case IPV6_RECVORIGDSTADDR: 1334 val = np->rxopt.bits.rxorigdstaddr; 1335 break; 1336 1337 case IPV6_UNICAST_HOPS: 1338 case IPV6_MULTICAST_HOPS: 1339 { 1340 struct dst_entry *dst; 1341 1342 if (optname == IPV6_UNICAST_HOPS) 1343 val = READ_ONCE(np->hop_limit); 1344 else 1345 val = READ_ONCE(np->mcast_hops); 1346 1347 if (val < 0) { 1348 rcu_read_lock(); 1349 dst = __sk_dst_get(sk); 1350 if (dst) 1351 val = ip6_dst_hoplimit(dst); 1352 rcu_read_unlock(); 1353 } 1354 1355 if (val < 0) 1356 val = sock_net(sk)->ipv6.devconf_all->hop_limit; 1357 break; 1358 } 1359 1360 case IPV6_MULTICAST_LOOP: 1361 val = inet6_test_bit(MC6_LOOP, sk); 1362 break; 1363 1364 case IPV6_MULTICAST_IF: 1365 val = np->mcast_oif; 1366 break; 1367 1368 case IPV6_MULTICAST_ALL: 1369 val = inet6_test_bit(MC6_ALL, sk); 1370 break; 1371 1372 case IPV6_UNICAST_IF: 1373 val = (__force int)htonl((__u32) np->ucast_oif); 1374 break; 1375 1376 case IPV6_MTU_DISCOVER: 1377 val = np->pmtudisc; 1378 break; 1379 1380 case IPV6_RECVERR: 1381 val = inet6_test_bit(RECVERR6, sk); 1382 break; 1383 1384 case IPV6_FLOWINFO_SEND: 1385 val = np->sndflow; 1386 break; 1387 1388 case IPV6_FLOWLABEL_MGR: 1389 { 1390 struct in6_flowlabel_req freq; 1391 int flags; 1392 1393 if (len < sizeof(freq)) 1394 return -EINVAL; 1395 1396 if (copy_from_sockptr(&freq, optval, sizeof(freq))) 1397 return -EFAULT; 1398 1399 if (freq.flr_action != IPV6_FL_A_GET) 1400 return -EINVAL; 1401 1402 len = sizeof(freq); 1403 flags = freq.flr_flags; 1404 1405 memset(&freq, 0, sizeof(freq)); 1406 1407 val = ipv6_flowlabel_opt_get(sk, &freq, flags); 1408 if (val < 0) 1409 return val; 1410 1411 if (copy_to_sockptr(optlen, &len, sizeof(int))) 1412 return -EFAULT; 1413 if (copy_to_sockptr(optval, &freq, len)) 1414 return -EFAULT; 1415 1416 return 0; 1417 } 1418 1419 case IPV6_ADDR_PREFERENCES: 1420 val = 0; 1421 1422 if (np->srcprefs & IPV6_PREFER_SRC_TMP) 1423 val |= IPV6_PREFER_SRC_TMP; 1424 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC) 1425 val |= IPV6_PREFER_SRC_PUBLIC; 1426 else { 1427 /* XXX: should we return system default? */ 1428 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT; 1429 } 1430 1431 if (np->srcprefs & IPV6_PREFER_SRC_COA) 1432 val |= IPV6_PREFER_SRC_COA; 1433 else 1434 val |= IPV6_PREFER_SRC_HOME; 1435 break; 1436 1437 case IPV6_MINHOPCOUNT: 1438 val = READ_ONCE(np->min_hopcount); 1439 break; 1440 1441 case IPV6_DONTFRAG: 1442 val = inet6_test_bit(DONTFRAG, sk); 1443 break; 1444 1445 case IPV6_AUTOFLOWLABEL: 1446 val = ip6_autoflowlabel(sock_net(sk), sk); 1447 break; 1448 1449 case IPV6_RECVFRAGSIZE: 1450 val = np->rxopt.bits.recvfragsize; 1451 break; 1452 1453 case IPV6_ROUTER_ALERT_ISOLATE: 1454 val = inet6_test_bit(RTALERT_ISOLATE, sk); 1455 break; 1456 1457 case IPV6_RECVERR_RFC4884: 1458 val = inet6_test_bit(RECVERR6_RFC4884, sk); 1459 break; 1460 1461 default: 1462 return -ENOPROTOOPT; 1463 } 1464 len = min_t(unsigned int, sizeof(int), len); 1465 if (copy_to_sockptr(optlen, &len, sizeof(int))) 1466 return -EFAULT; 1467 if (copy_to_sockptr(optval, &val, len)) 1468 return -EFAULT; 1469 return 0; 1470 } 1471 1472 int ipv6_getsockopt(struct sock *sk, int level, int optname, 1473 char __user *optval, int __user *optlen) 1474 { 1475 int err; 1476 1477 if (level == SOL_IP && sk->sk_type != SOCK_RAW) 1478 return udp_prot.getsockopt(sk, level, optname, optval, optlen); 1479 1480 if (level != SOL_IPV6) 1481 return -ENOPROTOOPT; 1482 1483 err = do_ipv6_getsockopt(sk, level, optname, 1484 USER_SOCKPTR(optval), USER_SOCKPTR(optlen)); 1485 #ifdef CONFIG_NETFILTER 1486 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1487 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) { 1488 int len; 1489 1490 if (get_user(len, optlen)) 1491 return -EFAULT; 1492 1493 err = nf_getsockopt(sk, PF_INET6, optname, optval, &len); 1494 if (err >= 0) 1495 err = put_user(len, optlen); 1496 } 1497 #endif 1498 return err; 1499 } 1500 EXPORT_SYMBOL(ipv6_getsockopt); 1501