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 } 482 if (needs_rtnl) 483 rtnl_lock(); 484 sockopt_lock_sock(sk); 485 486 /* Another thread has converted the socket into IPv4 with 487 * IPV6_ADDRFORM concurrently. 488 */ 489 if (unlikely(sk->sk_family != AF_INET6)) 490 goto unlock; 491 492 switch (optname) { 493 494 case IPV6_ADDRFORM: 495 if (optlen < sizeof(int)) 496 goto e_inval; 497 if (val == PF_INET) { 498 if (sk->sk_type == SOCK_RAW) 499 break; 500 501 if (sk->sk_protocol == IPPROTO_UDP || 502 sk->sk_protocol == IPPROTO_UDPLITE) { 503 struct udp_sock *up = udp_sk(sk); 504 if (up->pending == AF_INET6) { 505 retv = -EBUSY; 506 break; 507 } 508 } else if (sk->sk_protocol == IPPROTO_TCP) { 509 if (sk->sk_prot != &tcpv6_prot) { 510 retv = -EBUSY; 511 break; 512 } 513 } else { 514 break; 515 } 516 517 if (sk->sk_state != TCP_ESTABLISHED) { 518 retv = -ENOTCONN; 519 break; 520 } 521 522 if (ipv6_only_sock(sk) || 523 !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) { 524 retv = -EADDRNOTAVAIL; 525 break; 526 } 527 528 __ipv6_sock_mc_close(sk); 529 __ipv6_sock_ac_close(sk); 530 531 if (sk->sk_protocol == IPPROTO_TCP) { 532 struct inet_connection_sock *icsk = inet_csk(sk); 533 534 sock_prot_inuse_add(net, sk->sk_prot, -1); 535 sock_prot_inuse_add(net, &tcp_prot, 1); 536 537 /* Paired with READ_ONCE(sk->sk_prot) in inet6_stream_ops */ 538 WRITE_ONCE(sk->sk_prot, &tcp_prot); 539 /* Paired with READ_ONCE() in tcp_(get|set)sockopt() */ 540 WRITE_ONCE(icsk->icsk_af_ops, &ipv4_specific); 541 WRITE_ONCE(sk->sk_socket->ops, &inet_stream_ops); 542 WRITE_ONCE(sk->sk_family, PF_INET); 543 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie); 544 } else { 545 struct proto *prot = &udp_prot; 546 547 if (sk->sk_protocol == IPPROTO_UDPLITE) 548 prot = &udplite_prot; 549 550 sock_prot_inuse_add(net, sk->sk_prot, -1); 551 sock_prot_inuse_add(net, prot, 1); 552 553 /* Paired with READ_ONCE(sk->sk_prot) in inet6_dgram_ops */ 554 WRITE_ONCE(sk->sk_prot, prot); 555 WRITE_ONCE(sk->sk_socket->ops, &inet_dgram_ops); 556 WRITE_ONCE(sk->sk_family, PF_INET); 557 } 558 559 /* Disable all options not to allocate memory anymore, 560 * but there is still a race. See the lockless path 561 * in udpv6_sendmsg() and ipv6_local_rxpmtu(). 562 */ 563 np->rxopt.all = 0; 564 565 inet6_cleanup_sock(sk); 566 567 module_put(THIS_MODULE); 568 retv = 0; 569 break; 570 } 571 goto e_inval; 572 573 case IPV6_V6ONLY: 574 if (optlen < sizeof(int) || 575 inet_sk(sk)->inet_num) 576 goto e_inval; 577 sk->sk_ipv6only = valbool; 578 retv = 0; 579 break; 580 581 case IPV6_RECVPKTINFO: 582 if (optlen < sizeof(int)) 583 goto e_inval; 584 np->rxopt.bits.rxinfo = valbool; 585 retv = 0; 586 break; 587 588 case IPV6_2292PKTINFO: 589 if (optlen < sizeof(int)) 590 goto e_inval; 591 np->rxopt.bits.rxoinfo = valbool; 592 retv = 0; 593 break; 594 595 case IPV6_RECVHOPLIMIT: 596 if (optlen < sizeof(int)) 597 goto e_inval; 598 np->rxopt.bits.rxhlim = valbool; 599 retv = 0; 600 break; 601 602 case IPV6_2292HOPLIMIT: 603 if (optlen < sizeof(int)) 604 goto e_inval; 605 np->rxopt.bits.rxohlim = valbool; 606 retv = 0; 607 break; 608 609 case IPV6_RECVRTHDR: 610 if (optlen < sizeof(int)) 611 goto e_inval; 612 np->rxopt.bits.srcrt = valbool; 613 retv = 0; 614 break; 615 616 case IPV6_2292RTHDR: 617 if (optlen < sizeof(int)) 618 goto e_inval; 619 np->rxopt.bits.osrcrt = valbool; 620 retv = 0; 621 break; 622 623 case IPV6_RECVHOPOPTS: 624 if (optlen < sizeof(int)) 625 goto e_inval; 626 np->rxopt.bits.hopopts = valbool; 627 retv = 0; 628 break; 629 630 case IPV6_2292HOPOPTS: 631 if (optlen < sizeof(int)) 632 goto e_inval; 633 np->rxopt.bits.ohopopts = valbool; 634 retv = 0; 635 break; 636 637 case IPV6_RECVDSTOPTS: 638 if (optlen < sizeof(int)) 639 goto e_inval; 640 np->rxopt.bits.dstopts = valbool; 641 retv = 0; 642 break; 643 644 case IPV6_2292DSTOPTS: 645 if (optlen < sizeof(int)) 646 goto e_inval; 647 np->rxopt.bits.odstopts = valbool; 648 retv = 0; 649 break; 650 651 case IPV6_TCLASS: 652 if (optlen < sizeof(int)) 653 goto e_inval; 654 if (val < -1 || val > 0xff) 655 goto e_inval; 656 /* RFC 3542, 6.5: default traffic class of 0x0 */ 657 if (val == -1) 658 val = 0; 659 if (sk->sk_type == SOCK_STREAM) { 660 val &= ~INET_ECN_MASK; 661 val |= np->tclass & INET_ECN_MASK; 662 } 663 if (np->tclass != val) { 664 np->tclass = val; 665 sk_dst_reset(sk); 666 } 667 retv = 0; 668 break; 669 670 case IPV6_RECVTCLASS: 671 if (optlen < sizeof(int)) 672 goto e_inval; 673 np->rxopt.bits.rxtclass = valbool; 674 retv = 0; 675 break; 676 677 case IPV6_FLOWINFO: 678 if (optlen < sizeof(int)) 679 goto e_inval; 680 np->rxopt.bits.rxflow = valbool; 681 retv = 0; 682 break; 683 684 case IPV6_RECVPATHMTU: 685 if (optlen < sizeof(int)) 686 goto e_inval; 687 np->rxopt.bits.rxpmtu = valbool; 688 retv = 0; 689 break; 690 691 case IPV6_TRANSPARENT: 692 if (valbool && !sockopt_ns_capable(net->user_ns, CAP_NET_RAW) && 693 !sockopt_ns_capable(net->user_ns, CAP_NET_ADMIN)) { 694 retv = -EPERM; 695 break; 696 } 697 if (optlen < sizeof(int)) 698 goto e_inval; 699 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */ 700 inet_assign_bit(TRANSPARENT, sk, valbool); 701 retv = 0; 702 break; 703 704 case IPV6_FREEBIND: 705 if (optlen < sizeof(int)) 706 goto e_inval; 707 /* we also don't have a separate freebind bit for IPV6 */ 708 inet_assign_bit(FREEBIND, sk, valbool); 709 retv = 0; 710 break; 711 712 case IPV6_RECVORIGDSTADDR: 713 if (optlen < sizeof(int)) 714 goto e_inval; 715 np->rxopt.bits.rxorigdstaddr = valbool; 716 retv = 0; 717 break; 718 719 case IPV6_HOPOPTS: 720 case IPV6_RTHDRDSTOPTS: 721 case IPV6_RTHDR: 722 case IPV6_DSTOPTS: 723 retv = ipv6_set_opt_hdr(sk, optname, optval, optlen); 724 break; 725 726 case IPV6_PKTINFO: 727 { 728 struct in6_pktinfo pkt; 729 730 if (optlen == 0) 731 goto e_inval; 732 else if (optlen < sizeof(struct in6_pktinfo) || 733 sockptr_is_null(optval)) 734 goto e_inval; 735 736 if (copy_from_sockptr(&pkt, optval, sizeof(pkt))) { 737 retv = -EFAULT; 738 break; 739 } 740 if (!sk_dev_equal_l3scope(sk, pkt.ipi6_ifindex)) 741 goto e_inval; 742 743 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex; 744 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr; 745 retv = 0; 746 break; 747 } 748 749 case IPV6_2292PKTOPTIONS: 750 { 751 struct ipv6_txoptions *opt = NULL; 752 struct msghdr msg; 753 struct flowi6 fl6; 754 struct ipcm6_cookie ipc6; 755 756 memset(&fl6, 0, sizeof(fl6)); 757 fl6.flowi6_oif = sk->sk_bound_dev_if; 758 fl6.flowi6_mark = sk->sk_mark; 759 760 if (optlen == 0) 761 goto update; 762 763 /* 1K is probably excessive 764 * 1K is surely not enough, 2K per standard header is 16K. 765 */ 766 retv = -EINVAL; 767 if (optlen > 64*1024) 768 break; 769 770 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL); 771 retv = -ENOBUFS; 772 if (!opt) 773 break; 774 775 memset(opt, 0, sizeof(*opt)); 776 refcount_set(&opt->refcnt, 1); 777 opt->tot_len = sizeof(*opt) + optlen; 778 retv = -EFAULT; 779 if (copy_from_sockptr(opt + 1, optval, optlen)) 780 goto done; 781 782 msg.msg_controllen = optlen; 783 msg.msg_control_is_user = false; 784 msg.msg_control = (void *)(opt+1); 785 ipc6.opt = opt; 786 787 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6); 788 if (retv) 789 goto done; 790 update: 791 retv = 0; 792 opt = ipv6_update_options(sk, opt); 793 done: 794 if (opt) { 795 atomic_sub(opt->tot_len, &sk->sk_omem_alloc); 796 txopt_put(opt); 797 } 798 break; 799 } 800 801 802 case IPV6_UNICAST_IF: 803 { 804 struct net_device *dev = NULL; 805 int ifindex; 806 807 if (optlen != sizeof(int)) 808 goto e_inval; 809 810 ifindex = (__force int)ntohl((__force __be32)val); 811 if (ifindex == 0) { 812 np->ucast_oif = 0; 813 retv = 0; 814 break; 815 } 816 817 dev = dev_get_by_index(net, ifindex); 818 retv = -EADDRNOTAVAIL; 819 if (!dev) 820 break; 821 dev_put(dev); 822 823 retv = -EINVAL; 824 if (sk->sk_bound_dev_if) 825 break; 826 827 np->ucast_oif = ifindex; 828 retv = 0; 829 break; 830 } 831 832 case IPV6_MULTICAST_IF: 833 if (sk->sk_type == SOCK_STREAM) 834 break; 835 if (optlen < sizeof(int)) 836 goto e_inval; 837 838 if (val) { 839 struct net_device *dev; 840 int midx; 841 842 rcu_read_lock(); 843 844 dev = dev_get_by_index_rcu(net, val); 845 if (!dev) { 846 rcu_read_unlock(); 847 retv = -ENODEV; 848 break; 849 } 850 midx = l3mdev_master_ifindex_rcu(dev); 851 852 rcu_read_unlock(); 853 854 if (sk->sk_bound_dev_if && 855 sk->sk_bound_dev_if != val && 856 (!midx || midx != sk->sk_bound_dev_if)) 857 goto e_inval; 858 } 859 np->mcast_oif = val; 860 retv = 0; 861 break; 862 case IPV6_ADD_MEMBERSHIP: 863 case IPV6_DROP_MEMBERSHIP: 864 { 865 struct ipv6_mreq mreq; 866 867 if (optlen < sizeof(struct ipv6_mreq)) 868 goto e_inval; 869 870 retv = -EPROTO; 871 if (inet_test_bit(IS_ICSK, sk)) 872 break; 873 874 retv = -EFAULT; 875 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq))) 876 break; 877 878 if (optname == IPV6_ADD_MEMBERSHIP) 879 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr); 880 else 881 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr); 882 break; 883 } 884 case IPV6_JOIN_ANYCAST: 885 case IPV6_LEAVE_ANYCAST: 886 { 887 struct ipv6_mreq mreq; 888 889 if (optlen < sizeof(struct ipv6_mreq)) 890 goto e_inval; 891 892 retv = -EFAULT; 893 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq))) 894 break; 895 896 if (optname == IPV6_JOIN_ANYCAST) 897 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr); 898 else 899 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr); 900 break; 901 } 902 case MCAST_JOIN_GROUP: 903 case MCAST_LEAVE_GROUP: 904 if (in_compat_syscall()) 905 retv = compat_ipv6_mcast_join_leave(sk, optname, optval, 906 optlen); 907 else 908 retv = ipv6_mcast_join_leave(sk, optname, optval, 909 optlen); 910 break; 911 case MCAST_JOIN_SOURCE_GROUP: 912 case MCAST_LEAVE_SOURCE_GROUP: 913 case MCAST_BLOCK_SOURCE: 914 case MCAST_UNBLOCK_SOURCE: 915 retv = do_ipv6_mcast_group_source(sk, optname, optval, optlen); 916 break; 917 case MCAST_MSFILTER: 918 if (in_compat_syscall()) 919 retv = compat_ipv6_set_mcast_msfilter(sk, optval, 920 optlen); 921 else 922 retv = ipv6_set_mcast_msfilter(sk, optval, optlen); 923 break; 924 case IPV6_ROUTER_ALERT: 925 if (optlen < sizeof(int)) 926 goto e_inval; 927 retv = ip6_ra_control(sk, val); 928 break; 929 case IPV6_ROUTER_ALERT_ISOLATE: 930 if (optlen < sizeof(int)) 931 goto e_inval; 932 np->rtalert_isolate = valbool; 933 retv = 0; 934 break; 935 case IPV6_MTU_DISCOVER: 936 if (optlen < sizeof(int)) 937 goto e_inval; 938 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT) 939 goto e_inval; 940 np->pmtudisc = val; 941 retv = 0; 942 break; 943 case IPV6_RECVERR: 944 if (optlen < sizeof(int)) 945 goto e_inval; 946 np->recverr = valbool; 947 if (!val) 948 skb_errqueue_purge(&sk->sk_error_queue); 949 retv = 0; 950 break; 951 case IPV6_FLOWINFO_SEND: 952 if (optlen < sizeof(int)) 953 goto e_inval; 954 np->sndflow = valbool; 955 retv = 0; 956 break; 957 case IPV6_FLOWLABEL_MGR: 958 retv = ipv6_flowlabel_opt(sk, optval, optlen); 959 break; 960 case IPV6_IPSEC_POLICY: 961 case IPV6_XFRM_POLICY: 962 retv = -EPERM; 963 if (!sockopt_ns_capable(net->user_ns, CAP_NET_ADMIN)) 964 break; 965 retv = xfrm_user_policy(sk, optname, optval, optlen); 966 break; 967 968 case IPV6_ADDR_PREFERENCES: 969 if (optlen < sizeof(int)) 970 goto e_inval; 971 retv = __ip6_sock_set_addr_preferences(sk, val); 972 break; 973 case IPV6_DONTFRAG: 974 np->dontfrag = valbool; 975 retv = 0; 976 break; 977 case IPV6_RECVFRAGSIZE: 978 np->rxopt.bits.recvfragsize = valbool; 979 retv = 0; 980 break; 981 } 982 983 unlock: 984 sockopt_release_sock(sk); 985 if (needs_rtnl) 986 rtnl_unlock(); 987 988 return retv; 989 990 e_inval: 991 retv = -EINVAL; 992 goto unlock; 993 } 994 995 int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, 996 unsigned int optlen) 997 { 998 int err; 999 1000 if (level == SOL_IP && sk->sk_type != SOCK_RAW) 1001 return udp_prot.setsockopt(sk, level, optname, optval, optlen); 1002 1003 if (level != SOL_IPV6) 1004 return -ENOPROTOOPT; 1005 1006 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen); 1007 #ifdef CONFIG_NETFILTER 1008 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1009 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY && 1010 optname != IPV6_XFRM_POLICY) 1011 err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen); 1012 #endif 1013 return err; 1014 } 1015 EXPORT_SYMBOL(ipv6_setsockopt); 1016 1017 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt, 1018 int optname, sockptr_t optval, int len) 1019 { 1020 struct ipv6_opt_hdr *hdr; 1021 1022 if (!opt) 1023 return 0; 1024 1025 switch (optname) { 1026 case IPV6_HOPOPTS: 1027 hdr = opt->hopopt; 1028 break; 1029 case IPV6_RTHDRDSTOPTS: 1030 hdr = opt->dst0opt; 1031 break; 1032 case IPV6_RTHDR: 1033 hdr = (struct ipv6_opt_hdr *)opt->srcrt; 1034 break; 1035 case IPV6_DSTOPTS: 1036 hdr = opt->dst1opt; 1037 break; 1038 default: 1039 return -EINVAL; /* should not happen */ 1040 } 1041 1042 if (!hdr) 1043 return 0; 1044 1045 len = min_t(unsigned int, len, ipv6_optlen(hdr)); 1046 if (copy_to_sockptr(optval, hdr, len)) 1047 return -EFAULT; 1048 return len; 1049 } 1050 1051 static int ipv6_get_msfilter(struct sock *sk, sockptr_t optval, 1052 sockptr_t optlen, int len) 1053 { 1054 const int size0 = offsetof(struct group_filter, gf_slist_flex); 1055 struct group_filter gsf; 1056 int num; 1057 int err; 1058 1059 if (len < size0) 1060 return -EINVAL; 1061 if (copy_from_sockptr(&gsf, optval, size0)) 1062 return -EFAULT; 1063 if (gsf.gf_group.ss_family != AF_INET6) 1064 return -EADDRNOTAVAIL; 1065 num = gsf.gf_numsrc; 1066 sockopt_lock_sock(sk); 1067 err = ip6_mc_msfget(sk, &gsf, optval, size0); 1068 if (!err) { 1069 if (num > gsf.gf_numsrc) 1070 num = gsf.gf_numsrc; 1071 len = GROUP_FILTER_SIZE(num); 1072 if (copy_to_sockptr(optlen, &len, sizeof(int)) || 1073 copy_to_sockptr(optval, &gsf, size0)) 1074 err = -EFAULT; 1075 } 1076 sockopt_release_sock(sk); 1077 return err; 1078 } 1079 1080 static int compat_ipv6_get_msfilter(struct sock *sk, sockptr_t optval, 1081 sockptr_t optlen, int len) 1082 { 1083 const int size0 = offsetof(struct compat_group_filter, gf_slist_flex); 1084 struct compat_group_filter gf32; 1085 struct group_filter gf; 1086 int err; 1087 int num; 1088 1089 if (len < size0) 1090 return -EINVAL; 1091 1092 if (copy_from_sockptr(&gf32, optval, 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 sockopt_lock_sock(sk); 1103 err = ip6_mc_msfget(sk, &gf, optval, size0); 1104 sockopt_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 (copy_to_sockptr(optlen, &len, sizeof(int)) || 1111 copy_to_sockptr_offset(optval, offsetof(struct compat_group_filter, gf_fmode), 1112 &gf.gf_fmode, sizeof(gf32.gf_fmode)) || 1113 copy_to_sockptr_offset(optval, offsetof(struct compat_group_filter, gf_numsrc), 1114 &gf.gf_numsrc, sizeof(gf32.gf_numsrc))) 1115 return -EFAULT; 1116 return 0; 1117 } 1118 1119 int do_ipv6_getsockopt(struct sock *sk, int level, int optname, 1120 sockptr_t optval, sockptr_t optlen) 1121 { 1122 struct ipv6_pinfo *np = inet6_sk(sk); 1123 int len; 1124 int val; 1125 1126 if (ip6_mroute_opt(optname)) 1127 return ip6_mroute_getsockopt(sk, optname, optval, optlen); 1128 1129 if (copy_from_sockptr(&len, optlen, sizeof(int))) 1130 return -EFAULT; 1131 switch (optname) { 1132 case IPV6_ADDRFORM: 1133 if (sk->sk_protocol != IPPROTO_UDP && 1134 sk->sk_protocol != IPPROTO_UDPLITE && 1135 sk->sk_protocol != IPPROTO_TCP) 1136 return -ENOPROTOOPT; 1137 if (sk->sk_state != TCP_ESTABLISHED) 1138 return -ENOTCONN; 1139 val = sk->sk_family; 1140 break; 1141 case MCAST_MSFILTER: 1142 if (in_compat_syscall()) 1143 return compat_ipv6_get_msfilter(sk, optval, optlen, len); 1144 return ipv6_get_msfilter(sk, optval, optlen, len); 1145 case IPV6_2292PKTOPTIONS: 1146 { 1147 struct msghdr msg; 1148 struct sk_buff *skb; 1149 1150 if (sk->sk_type != SOCK_STREAM) 1151 return -ENOPROTOOPT; 1152 1153 if (optval.is_kernel) { 1154 msg.msg_control_is_user = false; 1155 msg.msg_control = optval.kernel; 1156 } else { 1157 msg.msg_control_is_user = true; 1158 msg.msg_control_user = optval.user; 1159 } 1160 msg.msg_controllen = len; 1161 msg.msg_flags = 0; 1162 1163 sockopt_lock_sock(sk); 1164 skb = np->pktoptions; 1165 if (skb) 1166 ip6_datagram_recv_ctl(sk, &msg, skb); 1167 sockopt_release_sock(sk); 1168 if (!skb) { 1169 if (np->rxopt.bits.rxinfo) { 1170 struct in6_pktinfo src_info; 1171 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif : 1172 np->sticky_pktinfo.ipi6_ifindex; 1173 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr; 1174 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info); 1175 } 1176 if (np->rxopt.bits.rxhlim) { 1177 int hlim = READ_ONCE(np->mcast_hops); 1178 1179 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); 1180 } 1181 if (np->rxopt.bits.rxtclass) { 1182 int tclass = (int)ip6_tclass(np->rcv_flowinfo); 1183 1184 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass); 1185 } 1186 if (np->rxopt.bits.rxoinfo) { 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 : 1191 np->sticky_pktinfo.ipi6_addr; 1192 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); 1193 } 1194 if (np->rxopt.bits.rxohlim) { 1195 int hlim = READ_ONCE(np->mcast_hops); 1196 1197 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); 1198 } 1199 if (np->rxopt.bits.rxflow) { 1200 __be32 flowinfo = np->rcv_flowinfo; 1201 1202 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo); 1203 } 1204 } 1205 len -= msg.msg_controllen; 1206 return copy_to_sockptr(optlen, &len, sizeof(int)); 1207 } 1208 case IPV6_MTU: 1209 { 1210 struct dst_entry *dst; 1211 1212 val = 0; 1213 rcu_read_lock(); 1214 dst = __sk_dst_get(sk); 1215 if (dst) 1216 val = dst_mtu(dst); 1217 rcu_read_unlock(); 1218 if (!val) 1219 return -ENOTCONN; 1220 break; 1221 } 1222 1223 case IPV6_V6ONLY: 1224 val = sk->sk_ipv6only; 1225 break; 1226 1227 case IPV6_RECVPKTINFO: 1228 val = np->rxopt.bits.rxinfo; 1229 break; 1230 1231 case IPV6_2292PKTINFO: 1232 val = np->rxopt.bits.rxoinfo; 1233 break; 1234 1235 case IPV6_RECVHOPLIMIT: 1236 val = np->rxopt.bits.rxhlim; 1237 break; 1238 1239 case IPV6_2292HOPLIMIT: 1240 val = np->rxopt.bits.rxohlim; 1241 break; 1242 1243 case IPV6_RECVRTHDR: 1244 val = np->rxopt.bits.srcrt; 1245 break; 1246 1247 case IPV6_2292RTHDR: 1248 val = np->rxopt.bits.osrcrt; 1249 break; 1250 1251 case IPV6_HOPOPTS: 1252 case IPV6_RTHDRDSTOPTS: 1253 case IPV6_RTHDR: 1254 case IPV6_DSTOPTS: 1255 { 1256 struct ipv6_txoptions *opt; 1257 1258 sockopt_lock_sock(sk); 1259 opt = rcu_dereference_protected(np->opt, 1260 lockdep_sock_is_held(sk)); 1261 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len); 1262 sockopt_release_sock(sk); 1263 /* check if ipv6_getsockopt_sticky() returns err code */ 1264 if (len < 0) 1265 return len; 1266 return copy_to_sockptr(optlen, &len, sizeof(int)); 1267 } 1268 1269 case IPV6_RECVHOPOPTS: 1270 val = np->rxopt.bits.hopopts; 1271 break; 1272 1273 case IPV6_2292HOPOPTS: 1274 val = np->rxopt.bits.ohopopts; 1275 break; 1276 1277 case IPV6_RECVDSTOPTS: 1278 val = np->rxopt.bits.dstopts; 1279 break; 1280 1281 case IPV6_2292DSTOPTS: 1282 val = np->rxopt.bits.odstopts; 1283 break; 1284 1285 case IPV6_TCLASS: 1286 val = np->tclass; 1287 break; 1288 1289 case IPV6_RECVTCLASS: 1290 val = np->rxopt.bits.rxtclass; 1291 break; 1292 1293 case IPV6_FLOWINFO: 1294 val = np->rxopt.bits.rxflow; 1295 break; 1296 1297 case IPV6_RECVPATHMTU: 1298 val = np->rxopt.bits.rxpmtu; 1299 break; 1300 1301 case IPV6_PATHMTU: 1302 { 1303 struct dst_entry *dst; 1304 struct ip6_mtuinfo mtuinfo; 1305 1306 if (len < sizeof(mtuinfo)) 1307 return -EINVAL; 1308 1309 len = sizeof(mtuinfo); 1310 memset(&mtuinfo, 0, sizeof(mtuinfo)); 1311 1312 rcu_read_lock(); 1313 dst = __sk_dst_get(sk); 1314 if (dst) 1315 mtuinfo.ip6m_mtu = dst_mtu(dst); 1316 rcu_read_unlock(); 1317 if (!mtuinfo.ip6m_mtu) 1318 return -ENOTCONN; 1319 1320 if (copy_to_sockptr(optlen, &len, sizeof(int))) 1321 return -EFAULT; 1322 if (copy_to_sockptr(optval, &mtuinfo, len)) 1323 return -EFAULT; 1324 1325 return 0; 1326 } 1327 1328 case IPV6_TRANSPARENT: 1329 val = inet_test_bit(TRANSPARENT, sk); 1330 break; 1331 1332 case IPV6_FREEBIND: 1333 val = inet_test_bit(FREEBIND, sk); 1334 break; 1335 1336 case IPV6_RECVORIGDSTADDR: 1337 val = np->rxopt.bits.rxorigdstaddr; 1338 break; 1339 1340 case IPV6_UNICAST_HOPS: 1341 case IPV6_MULTICAST_HOPS: 1342 { 1343 struct dst_entry *dst; 1344 1345 if (optname == IPV6_UNICAST_HOPS) 1346 val = READ_ONCE(np->hop_limit); 1347 else 1348 val = READ_ONCE(np->mcast_hops); 1349 1350 if (val < 0) { 1351 rcu_read_lock(); 1352 dst = __sk_dst_get(sk); 1353 if (dst) 1354 val = ip6_dst_hoplimit(dst); 1355 rcu_read_unlock(); 1356 } 1357 1358 if (val < 0) 1359 val = sock_net(sk)->ipv6.devconf_all->hop_limit; 1360 break; 1361 } 1362 1363 case IPV6_MULTICAST_LOOP: 1364 val = inet6_test_bit(MC6_LOOP, sk); 1365 break; 1366 1367 case IPV6_MULTICAST_IF: 1368 val = np->mcast_oif; 1369 break; 1370 1371 case IPV6_MULTICAST_ALL: 1372 val = inet6_test_bit(MC6_ALL, sk); 1373 break; 1374 1375 case IPV6_UNICAST_IF: 1376 val = (__force int)htonl((__u32) np->ucast_oif); 1377 break; 1378 1379 case IPV6_MTU_DISCOVER: 1380 val = np->pmtudisc; 1381 break; 1382 1383 case IPV6_RECVERR: 1384 val = np->recverr; 1385 break; 1386 1387 case IPV6_FLOWINFO_SEND: 1388 val = np->sndflow; 1389 break; 1390 1391 case IPV6_FLOWLABEL_MGR: 1392 { 1393 struct in6_flowlabel_req freq; 1394 int flags; 1395 1396 if (len < sizeof(freq)) 1397 return -EINVAL; 1398 1399 if (copy_from_sockptr(&freq, optval, sizeof(freq))) 1400 return -EFAULT; 1401 1402 if (freq.flr_action != IPV6_FL_A_GET) 1403 return -EINVAL; 1404 1405 len = sizeof(freq); 1406 flags = freq.flr_flags; 1407 1408 memset(&freq, 0, sizeof(freq)); 1409 1410 val = ipv6_flowlabel_opt_get(sk, &freq, flags); 1411 if (val < 0) 1412 return val; 1413 1414 if (copy_to_sockptr(optlen, &len, sizeof(int))) 1415 return -EFAULT; 1416 if (copy_to_sockptr(optval, &freq, len)) 1417 return -EFAULT; 1418 1419 return 0; 1420 } 1421 1422 case IPV6_ADDR_PREFERENCES: 1423 val = 0; 1424 1425 if (np->srcprefs & IPV6_PREFER_SRC_TMP) 1426 val |= IPV6_PREFER_SRC_TMP; 1427 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC) 1428 val |= IPV6_PREFER_SRC_PUBLIC; 1429 else { 1430 /* XXX: should we return system default? */ 1431 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT; 1432 } 1433 1434 if (np->srcprefs & IPV6_PREFER_SRC_COA) 1435 val |= IPV6_PREFER_SRC_COA; 1436 else 1437 val |= IPV6_PREFER_SRC_HOME; 1438 break; 1439 1440 case IPV6_MINHOPCOUNT: 1441 val = READ_ONCE(np->min_hopcount); 1442 break; 1443 1444 case IPV6_DONTFRAG: 1445 val = np->dontfrag; 1446 break; 1447 1448 case IPV6_AUTOFLOWLABEL: 1449 val = ip6_autoflowlabel(sock_net(sk), sk); 1450 break; 1451 1452 case IPV6_RECVFRAGSIZE: 1453 val = np->rxopt.bits.recvfragsize; 1454 break; 1455 1456 case IPV6_ROUTER_ALERT_ISOLATE: 1457 val = np->rtalert_isolate; 1458 break; 1459 1460 case IPV6_RECVERR_RFC4884: 1461 val = inet6_test_bit(RECVERR6_RFC4884, sk); 1462 break; 1463 1464 default: 1465 return -ENOPROTOOPT; 1466 } 1467 len = min_t(unsigned int, sizeof(int), len); 1468 if (copy_to_sockptr(optlen, &len, sizeof(int))) 1469 return -EFAULT; 1470 if (copy_to_sockptr(optval, &val, len)) 1471 return -EFAULT; 1472 return 0; 1473 } 1474 1475 int ipv6_getsockopt(struct sock *sk, int level, int optname, 1476 char __user *optval, int __user *optlen) 1477 { 1478 int err; 1479 1480 if (level == SOL_IP && sk->sk_type != SOCK_RAW) 1481 return udp_prot.getsockopt(sk, level, optname, optval, optlen); 1482 1483 if (level != SOL_IPV6) 1484 return -ENOPROTOOPT; 1485 1486 err = do_ipv6_getsockopt(sk, level, optname, 1487 USER_SOCKPTR(optval), USER_SOCKPTR(optlen)); 1488 #ifdef CONFIG_NETFILTER 1489 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1490 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) { 1491 int len; 1492 1493 if (get_user(len, optlen)) 1494 return -EFAULT; 1495 1496 err = nf_getsockopt(sk, PF_INET6, optname, optval, &len); 1497 if (err >= 0) 1498 err = put_user(len, optlen); 1499 } 1500 #endif 1501 return err; 1502 } 1503 EXPORT_SYMBOL(ipv6_getsockopt); 1504