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 } 473 if (needs_rtnl) 474 rtnl_lock(); 475 sockopt_lock_sock(sk); 476 477 /* Another thread has converted the socket into IPv4 with 478 * IPV6_ADDRFORM concurrently. 479 */ 480 if (unlikely(sk->sk_family != AF_INET6)) 481 goto unlock; 482 483 switch (optname) { 484 485 case IPV6_ADDRFORM: 486 if (optlen < sizeof(int)) 487 goto e_inval; 488 if (val == PF_INET) { 489 if (sk->sk_type == SOCK_RAW) 490 break; 491 492 if (sk->sk_protocol == IPPROTO_UDP || 493 sk->sk_protocol == IPPROTO_UDPLITE) { 494 struct udp_sock *up = udp_sk(sk); 495 if (up->pending == AF_INET6) { 496 retv = -EBUSY; 497 break; 498 } 499 } else if (sk->sk_protocol == IPPROTO_TCP) { 500 if (sk->sk_prot != &tcpv6_prot) { 501 retv = -EBUSY; 502 break; 503 } 504 } else { 505 break; 506 } 507 508 if (sk->sk_state != TCP_ESTABLISHED) { 509 retv = -ENOTCONN; 510 break; 511 } 512 513 if (ipv6_only_sock(sk) || 514 !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) { 515 retv = -EADDRNOTAVAIL; 516 break; 517 } 518 519 __ipv6_sock_mc_close(sk); 520 __ipv6_sock_ac_close(sk); 521 522 if (sk->sk_protocol == IPPROTO_TCP) { 523 struct inet_connection_sock *icsk = inet_csk(sk); 524 525 sock_prot_inuse_add(net, sk->sk_prot, -1); 526 sock_prot_inuse_add(net, &tcp_prot, 1); 527 528 /* Paired with READ_ONCE(sk->sk_prot) in inet6_stream_ops */ 529 WRITE_ONCE(sk->sk_prot, &tcp_prot); 530 /* Paired with READ_ONCE() in tcp_(get|set)sockopt() */ 531 WRITE_ONCE(icsk->icsk_af_ops, &ipv4_specific); 532 WRITE_ONCE(sk->sk_socket->ops, &inet_stream_ops); 533 WRITE_ONCE(sk->sk_family, PF_INET); 534 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie); 535 } else { 536 struct proto *prot = &udp_prot; 537 538 if (sk->sk_protocol == IPPROTO_UDPLITE) 539 prot = &udplite_prot; 540 541 sock_prot_inuse_add(net, sk->sk_prot, -1); 542 sock_prot_inuse_add(net, prot, 1); 543 544 /* Paired with READ_ONCE(sk->sk_prot) in inet6_dgram_ops */ 545 WRITE_ONCE(sk->sk_prot, prot); 546 WRITE_ONCE(sk->sk_socket->ops, &inet_dgram_ops); 547 WRITE_ONCE(sk->sk_family, PF_INET); 548 } 549 550 /* Disable all options not to allocate memory anymore, 551 * but there is still a race. See the lockless path 552 * in udpv6_sendmsg() and ipv6_local_rxpmtu(). 553 */ 554 np->rxopt.all = 0; 555 556 inet6_cleanup_sock(sk); 557 558 module_put(THIS_MODULE); 559 retv = 0; 560 break; 561 } 562 goto e_inval; 563 564 case IPV6_V6ONLY: 565 if (optlen < sizeof(int) || 566 inet_sk(sk)->inet_num) 567 goto e_inval; 568 sk->sk_ipv6only = valbool; 569 retv = 0; 570 break; 571 572 case IPV6_RECVPKTINFO: 573 if (optlen < sizeof(int)) 574 goto e_inval; 575 np->rxopt.bits.rxinfo = valbool; 576 retv = 0; 577 break; 578 579 case IPV6_2292PKTINFO: 580 if (optlen < sizeof(int)) 581 goto e_inval; 582 np->rxopt.bits.rxoinfo = valbool; 583 retv = 0; 584 break; 585 586 case IPV6_RECVHOPLIMIT: 587 if (optlen < sizeof(int)) 588 goto e_inval; 589 np->rxopt.bits.rxhlim = valbool; 590 retv = 0; 591 break; 592 593 case IPV6_2292HOPLIMIT: 594 if (optlen < sizeof(int)) 595 goto e_inval; 596 np->rxopt.bits.rxohlim = valbool; 597 retv = 0; 598 break; 599 600 case IPV6_RECVRTHDR: 601 if (optlen < sizeof(int)) 602 goto e_inval; 603 np->rxopt.bits.srcrt = valbool; 604 retv = 0; 605 break; 606 607 case IPV6_2292RTHDR: 608 if (optlen < sizeof(int)) 609 goto e_inval; 610 np->rxopt.bits.osrcrt = valbool; 611 retv = 0; 612 break; 613 614 case IPV6_RECVHOPOPTS: 615 if (optlen < sizeof(int)) 616 goto e_inval; 617 np->rxopt.bits.hopopts = valbool; 618 retv = 0; 619 break; 620 621 case IPV6_2292HOPOPTS: 622 if (optlen < sizeof(int)) 623 goto e_inval; 624 np->rxopt.bits.ohopopts = valbool; 625 retv = 0; 626 break; 627 628 case IPV6_RECVDSTOPTS: 629 if (optlen < sizeof(int)) 630 goto e_inval; 631 np->rxopt.bits.dstopts = valbool; 632 retv = 0; 633 break; 634 635 case IPV6_2292DSTOPTS: 636 if (optlen < sizeof(int)) 637 goto e_inval; 638 np->rxopt.bits.odstopts = valbool; 639 retv = 0; 640 break; 641 642 case IPV6_TCLASS: 643 if (optlen < sizeof(int)) 644 goto e_inval; 645 if (val < -1 || val > 0xff) 646 goto e_inval; 647 /* RFC 3542, 6.5: default traffic class of 0x0 */ 648 if (val == -1) 649 val = 0; 650 if (sk->sk_type == SOCK_STREAM) { 651 val &= ~INET_ECN_MASK; 652 val |= np->tclass & INET_ECN_MASK; 653 } 654 if (np->tclass != val) { 655 np->tclass = val; 656 sk_dst_reset(sk); 657 } 658 retv = 0; 659 break; 660 661 case IPV6_RECVTCLASS: 662 if (optlen < sizeof(int)) 663 goto e_inval; 664 np->rxopt.bits.rxtclass = valbool; 665 retv = 0; 666 break; 667 668 case IPV6_FLOWINFO: 669 if (optlen < sizeof(int)) 670 goto e_inval; 671 np->rxopt.bits.rxflow = valbool; 672 retv = 0; 673 break; 674 675 case IPV6_RECVPATHMTU: 676 if (optlen < sizeof(int)) 677 goto e_inval; 678 np->rxopt.bits.rxpmtu = valbool; 679 retv = 0; 680 break; 681 682 case IPV6_TRANSPARENT: 683 if (valbool && !sockopt_ns_capable(net->user_ns, CAP_NET_RAW) && 684 !sockopt_ns_capable(net->user_ns, CAP_NET_ADMIN)) { 685 retv = -EPERM; 686 break; 687 } 688 if (optlen < sizeof(int)) 689 goto e_inval; 690 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */ 691 inet_assign_bit(TRANSPARENT, sk, valbool); 692 retv = 0; 693 break; 694 695 case IPV6_FREEBIND: 696 if (optlen < sizeof(int)) 697 goto e_inval; 698 /* we also don't have a separate freebind bit for IPV6 */ 699 inet_assign_bit(FREEBIND, sk, valbool); 700 retv = 0; 701 break; 702 703 case IPV6_RECVORIGDSTADDR: 704 if (optlen < sizeof(int)) 705 goto e_inval; 706 np->rxopt.bits.rxorigdstaddr = valbool; 707 retv = 0; 708 break; 709 710 case IPV6_HOPOPTS: 711 case IPV6_RTHDRDSTOPTS: 712 case IPV6_RTHDR: 713 case IPV6_DSTOPTS: 714 retv = ipv6_set_opt_hdr(sk, optname, optval, optlen); 715 break; 716 717 case IPV6_PKTINFO: 718 { 719 struct in6_pktinfo pkt; 720 721 if (optlen == 0) 722 goto e_inval; 723 else if (optlen < sizeof(struct in6_pktinfo) || 724 sockptr_is_null(optval)) 725 goto e_inval; 726 727 if (copy_from_sockptr(&pkt, optval, sizeof(pkt))) { 728 retv = -EFAULT; 729 break; 730 } 731 if (!sk_dev_equal_l3scope(sk, pkt.ipi6_ifindex)) 732 goto e_inval; 733 734 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex; 735 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr; 736 retv = 0; 737 break; 738 } 739 740 case IPV6_2292PKTOPTIONS: 741 { 742 struct ipv6_txoptions *opt = NULL; 743 struct msghdr msg; 744 struct flowi6 fl6; 745 struct ipcm6_cookie ipc6; 746 747 memset(&fl6, 0, sizeof(fl6)); 748 fl6.flowi6_oif = sk->sk_bound_dev_if; 749 fl6.flowi6_mark = sk->sk_mark; 750 751 if (optlen == 0) 752 goto update; 753 754 /* 1K is probably excessive 755 * 1K is surely not enough, 2K per standard header is 16K. 756 */ 757 retv = -EINVAL; 758 if (optlen > 64*1024) 759 break; 760 761 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL); 762 retv = -ENOBUFS; 763 if (!opt) 764 break; 765 766 memset(opt, 0, sizeof(*opt)); 767 refcount_set(&opt->refcnt, 1); 768 opt->tot_len = sizeof(*opt) + optlen; 769 retv = -EFAULT; 770 if (copy_from_sockptr(opt + 1, optval, optlen)) 771 goto done; 772 773 msg.msg_controllen = optlen; 774 msg.msg_control_is_user = false; 775 msg.msg_control = (void *)(opt+1); 776 ipc6.opt = opt; 777 778 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6); 779 if (retv) 780 goto done; 781 update: 782 retv = 0; 783 opt = ipv6_update_options(sk, opt); 784 done: 785 if (opt) { 786 atomic_sub(opt->tot_len, &sk->sk_omem_alloc); 787 txopt_put(opt); 788 } 789 break; 790 } 791 792 793 case IPV6_UNICAST_IF: 794 { 795 struct net_device *dev = NULL; 796 int ifindex; 797 798 if (optlen != sizeof(int)) 799 goto e_inval; 800 801 ifindex = (__force int)ntohl((__force __be32)val); 802 if (ifindex == 0) { 803 np->ucast_oif = 0; 804 retv = 0; 805 break; 806 } 807 808 dev = dev_get_by_index(net, ifindex); 809 retv = -EADDRNOTAVAIL; 810 if (!dev) 811 break; 812 dev_put(dev); 813 814 retv = -EINVAL; 815 if (sk->sk_bound_dev_if) 816 break; 817 818 np->ucast_oif = ifindex; 819 retv = 0; 820 break; 821 } 822 823 case IPV6_MULTICAST_IF: 824 if (sk->sk_type == SOCK_STREAM) 825 break; 826 if (optlen < sizeof(int)) 827 goto e_inval; 828 829 if (val) { 830 struct net_device *dev; 831 int midx; 832 833 rcu_read_lock(); 834 835 dev = dev_get_by_index_rcu(net, val); 836 if (!dev) { 837 rcu_read_unlock(); 838 retv = -ENODEV; 839 break; 840 } 841 midx = l3mdev_master_ifindex_rcu(dev); 842 843 rcu_read_unlock(); 844 845 if (sk->sk_bound_dev_if && 846 sk->sk_bound_dev_if != val && 847 (!midx || midx != sk->sk_bound_dev_if)) 848 goto e_inval; 849 } 850 np->mcast_oif = val; 851 retv = 0; 852 break; 853 case IPV6_ADD_MEMBERSHIP: 854 case IPV6_DROP_MEMBERSHIP: 855 { 856 struct ipv6_mreq mreq; 857 858 if (optlen < sizeof(struct ipv6_mreq)) 859 goto e_inval; 860 861 retv = -EPROTO; 862 if (inet_test_bit(IS_ICSK, sk)) 863 break; 864 865 retv = -EFAULT; 866 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq))) 867 break; 868 869 if (optname == IPV6_ADD_MEMBERSHIP) 870 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr); 871 else 872 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr); 873 break; 874 } 875 case IPV6_JOIN_ANYCAST: 876 case IPV6_LEAVE_ANYCAST: 877 { 878 struct ipv6_mreq mreq; 879 880 if (optlen < sizeof(struct ipv6_mreq)) 881 goto e_inval; 882 883 retv = -EFAULT; 884 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq))) 885 break; 886 887 if (optname == IPV6_JOIN_ANYCAST) 888 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr); 889 else 890 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr); 891 break; 892 } 893 case IPV6_MULTICAST_ALL: 894 if (optlen < sizeof(int)) 895 goto e_inval; 896 np->mc_all = valbool; 897 retv = 0; 898 break; 899 900 case MCAST_JOIN_GROUP: 901 case MCAST_LEAVE_GROUP: 902 if (in_compat_syscall()) 903 retv = compat_ipv6_mcast_join_leave(sk, optname, optval, 904 optlen); 905 else 906 retv = ipv6_mcast_join_leave(sk, optname, optval, 907 optlen); 908 break; 909 case MCAST_JOIN_SOURCE_GROUP: 910 case MCAST_LEAVE_SOURCE_GROUP: 911 case MCAST_BLOCK_SOURCE: 912 case MCAST_UNBLOCK_SOURCE: 913 retv = do_ipv6_mcast_group_source(sk, optname, optval, optlen); 914 break; 915 case MCAST_MSFILTER: 916 if (in_compat_syscall()) 917 retv = compat_ipv6_set_mcast_msfilter(sk, optval, 918 optlen); 919 else 920 retv = ipv6_set_mcast_msfilter(sk, optval, optlen); 921 break; 922 case IPV6_ROUTER_ALERT: 923 if (optlen < sizeof(int)) 924 goto e_inval; 925 retv = ip6_ra_control(sk, val); 926 break; 927 case IPV6_ROUTER_ALERT_ISOLATE: 928 if (optlen < sizeof(int)) 929 goto e_inval; 930 np->rtalert_isolate = valbool; 931 retv = 0; 932 break; 933 case IPV6_MTU_DISCOVER: 934 if (optlen < sizeof(int)) 935 goto e_inval; 936 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT) 937 goto e_inval; 938 np->pmtudisc = val; 939 retv = 0; 940 break; 941 case IPV6_RECVERR: 942 if (optlen < sizeof(int)) 943 goto e_inval; 944 np->recverr = valbool; 945 if (!val) 946 skb_errqueue_purge(&sk->sk_error_queue); 947 retv = 0; 948 break; 949 case IPV6_FLOWINFO_SEND: 950 if (optlen < sizeof(int)) 951 goto e_inval; 952 np->sndflow = valbool; 953 retv = 0; 954 break; 955 case IPV6_FLOWLABEL_MGR: 956 retv = ipv6_flowlabel_opt(sk, optval, optlen); 957 break; 958 case IPV6_IPSEC_POLICY: 959 case IPV6_XFRM_POLICY: 960 retv = -EPERM; 961 if (!sockopt_ns_capable(net->user_ns, CAP_NET_ADMIN)) 962 break; 963 retv = xfrm_user_policy(sk, optname, optval, optlen); 964 break; 965 966 case IPV6_ADDR_PREFERENCES: 967 if (optlen < sizeof(int)) 968 goto e_inval; 969 retv = __ip6_sock_set_addr_preferences(sk, val); 970 break; 971 case IPV6_DONTFRAG: 972 np->dontfrag = valbool; 973 retv = 0; 974 break; 975 case IPV6_AUTOFLOWLABEL: 976 np->autoflowlabel = valbool; 977 np->autoflowlabel_set = 1; 978 retv = 0; 979 break; 980 case IPV6_RECVFRAGSIZE: 981 np->rxopt.bits.recvfragsize = valbool; 982 retv = 0; 983 break; 984 } 985 986 unlock: 987 sockopt_release_sock(sk); 988 if (needs_rtnl) 989 rtnl_unlock(); 990 991 return retv; 992 993 e_inval: 994 retv = -EINVAL; 995 goto unlock; 996 } 997 998 int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, 999 unsigned int optlen) 1000 { 1001 int err; 1002 1003 if (level == SOL_IP && sk->sk_type != SOCK_RAW) 1004 return udp_prot.setsockopt(sk, level, optname, optval, optlen); 1005 1006 if (level != SOL_IPV6) 1007 return -ENOPROTOOPT; 1008 1009 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen); 1010 #ifdef CONFIG_NETFILTER 1011 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1012 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY && 1013 optname != IPV6_XFRM_POLICY) 1014 err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen); 1015 #endif 1016 return err; 1017 } 1018 EXPORT_SYMBOL(ipv6_setsockopt); 1019 1020 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt, 1021 int optname, sockptr_t optval, int len) 1022 { 1023 struct ipv6_opt_hdr *hdr; 1024 1025 if (!opt) 1026 return 0; 1027 1028 switch (optname) { 1029 case IPV6_HOPOPTS: 1030 hdr = opt->hopopt; 1031 break; 1032 case IPV6_RTHDRDSTOPTS: 1033 hdr = opt->dst0opt; 1034 break; 1035 case IPV6_RTHDR: 1036 hdr = (struct ipv6_opt_hdr *)opt->srcrt; 1037 break; 1038 case IPV6_DSTOPTS: 1039 hdr = opt->dst1opt; 1040 break; 1041 default: 1042 return -EINVAL; /* should not happen */ 1043 } 1044 1045 if (!hdr) 1046 return 0; 1047 1048 len = min_t(unsigned int, len, ipv6_optlen(hdr)); 1049 if (copy_to_sockptr(optval, hdr, len)) 1050 return -EFAULT; 1051 return len; 1052 } 1053 1054 static int ipv6_get_msfilter(struct sock *sk, sockptr_t optval, 1055 sockptr_t optlen, int len) 1056 { 1057 const int size0 = offsetof(struct group_filter, gf_slist_flex); 1058 struct group_filter gsf; 1059 int num; 1060 int err; 1061 1062 if (len < size0) 1063 return -EINVAL; 1064 if (copy_from_sockptr(&gsf, optval, size0)) 1065 return -EFAULT; 1066 if (gsf.gf_group.ss_family != AF_INET6) 1067 return -EADDRNOTAVAIL; 1068 num = gsf.gf_numsrc; 1069 sockopt_lock_sock(sk); 1070 err = ip6_mc_msfget(sk, &gsf, optval, size0); 1071 if (!err) { 1072 if (num > gsf.gf_numsrc) 1073 num = gsf.gf_numsrc; 1074 len = GROUP_FILTER_SIZE(num); 1075 if (copy_to_sockptr(optlen, &len, sizeof(int)) || 1076 copy_to_sockptr(optval, &gsf, size0)) 1077 err = -EFAULT; 1078 } 1079 sockopt_release_sock(sk); 1080 return err; 1081 } 1082 1083 static int compat_ipv6_get_msfilter(struct sock *sk, sockptr_t optval, 1084 sockptr_t optlen, int len) 1085 { 1086 const int size0 = offsetof(struct compat_group_filter, gf_slist_flex); 1087 struct compat_group_filter gf32; 1088 struct group_filter gf; 1089 int err; 1090 int num; 1091 1092 if (len < size0) 1093 return -EINVAL; 1094 1095 if (copy_from_sockptr(&gf32, optval, size0)) 1096 return -EFAULT; 1097 gf.gf_interface = gf32.gf_interface; 1098 gf.gf_fmode = gf32.gf_fmode; 1099 num = gf.gf_numsrc = gf32.gf_numsrc; 1100 gf.gf_group = gf32.gf_group; 1101 1102 if (gf.gf_group.ss_family != AF_INET6) 1103 return -EADDRNOTAVAIL; 1104 1105 sockopt_lock_sock(sk); 1106 err = ip6_mc_msfget(sk, &gf, optval, size0); 1107 sockopt_release_sock(sk); 1108 if (err) 1109 return err; 1110 if (num > gf.gf_numsrc) 1111 num = gf.gf_numsrc; 1112 len = GROUP_FILTER_SIZE(num) - (sizeof(gf)-sizeof(gf32)); 1113 if (copy_to_sockptr(optlen, &len, sizeof(int)) || 1114 copy_to_sockptr_offset(optval, offsetof(struct compat_group_filter, gf_fmode), 1115 &gf.gf_fmode, sizeof(gf32.gf_fmode)) || 1116 copy_to_sockptr_offset(optval, offsetof(struct compat_group_filter, gf_numsrc), 1117 &gf.gf_numsrc, sizeof(gf32.gf_numsrc))) 1118 return -EFAULT; 1119 return 0; 1120 } 1121 1122 int do_ipv6_getsockopt(struct sock *sk, int level, int optname, 1123 sockptr_t optval, sockptr_t optlen) 1124 { 1125 struct ipv6_pinfo *np = inet6_sk(sk); 1126 int len; 1127 int val; 1128 1129 if (ip6_mroute_opt(optname)) 1130 return ip6_mroute_getsockopt(sk, optname, optval, optlen); 1131 1132 if (copy_from_sockptr(&len, optlen, sizeof(int))) 1133 return -EFAULT; 1134 switch (optname) { 1135 case IPV6_ADDRFORM: 1136 if (sk->sk_protocol != IPPROTO_UDP && 1137 sk->sk_protocol != IPPROTO_UDPLITE && 1138 sk->sk_protocol != IPPROTO_TCP) 1139 return -ENOPROTOOPT; 1140 if (sk->sk_state != TCP_ESTABLISHED) 1141 return -ENOTCONN; 1142 val = sk->sk_family; 1143 break; 1144 case MCAST_MSFILTER: 1145 if (in_compat_syscall()) 1146 return compat_ipv6_get_msfilter(sk, optval, optlen, len); 1147 return ipv6_get_msfilter(sk, optval, optlen, len); 1148 case IPV6_2292PKTOPTIONS: 1149 { 1150 struct msghdr msg; 1151 struct sk_buff *skb; 1152 1153 if (sk->sk_type != SOCK_STREAM) 1154 return -ENOPROTOOPT; 1155 1156 if (optval.is_kernel) { 1157 msg.msg_control_is_user = false; 1158 msg.msg_control = optval.kernel; 1159 } else { 1160 msg.msg_control_is_user = true; 1161 msg.msg_control_user = optval.user; 1162 } 1163 msg.msg_controllen = len; 1164 msg.msg_flags = 0; 1165 1166 sockopt_lock_sock(sk); 1167 skb = np->pktoptions; 1168 if (skb) 1169 ip6_datagram_recv_ctl(sk, &msg, skb); 1170 sockopt_release_sock(sk); 1171 if (!skb) { 1172 if (np->rxopt.bits.rxinfo) { 1173 struct in6_pktinfo src_info; 1174 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif : 1175 np->sticky_pktinfo.ipi6_ifindex; 1176 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr; 1177 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info); 1178 } 1179 if (np->rxopt.bits.rxhlim) { 1180 int hlim = READ_ONCE(np->mcast_hops); 1181 1182 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); 1183 } 1184 if (np->rxopt.bits.rxtclass) { 1185 int tclass = (int)ip6_tclass(np->rcv_flowinfo); 1186 1187 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass); 1188 } 1189 if (np->rxopt.bits.rxoinfo) { 1190 struct in6_pktinfo src_info; 1191 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif : 1192 np->sticky_pktinfo.ipi6_ifindex; 1193 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : 1194 np->sticky_pktinfo.ipi6_addr; 1195 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); 1196 } 1197 if (np->rxopt.bits.rxohlim) { 1198 int hlim = READ_ONCE(np->mcast_hops); 1199 1200 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); 1201 } 1202 if (np->rxopt.bits.rxflow) { 1203 __be32 flowinfo = np->rcv_flowinfo; 1204 1205 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo); 1206 } 1207 } 1208 len -= msg.msg_controllen; 1209 return copy_to_sockptr(optlen, &len, sizeof(int)); 1210 } 1211 case IPV6_MTU: 1212 { 1213 struct dst_entry *dst; 1214 1215 val = 0; 1216 rcu_read_lock(); 1217 dst = __sk_dst_get(sk); 1218 if (dst) 1219 val = dst_mtu(dst); 1220 rcu_read_unlock(); 1221 if (!val) 1222 return -ENOTCONN; 1223 break; 1224 } 1225 1226 case IPV6_V6ONLY: 1227 val = sk->sk_ipv6only; 1228 break; 1229 1230 case IPV6_RECVPKTINFO: 1231 val = np->rxopt.bits.rxinfo; 1232 break; 1233 1234 case IPV6_2292PKTINFO: 1235 val = np->rxopt.bits.rxoinfo; 1236 break; 1237 1238 case IPV6_RECVHOPLIMIT: 1239 val = np->rxopt.bits.rxhlim; 1240 break; 1241 1242 case IPV6_2292HOPLIMIT: 1243 val = np->rxopt.bits.rxohlim; 1244 break; 1245 1246 case IPV6_RECVRTHDR: 1247 val = np->rxopt.bits.srcrt; 1248 break; 1249 1250 case IPV6_2292RTHDR: 1251 val = np->rxopt.bits.osrcrt; 1252 break; 1253 1254 case IPV6_HOPOPTS: 1255 case IPV6_RTHDRDSTOPTS: 1256 case IPV6_RTHDR: 1257 case IPV6_DSTOPTS: 1258 { 1259 struct ipv6_txoptions *opt; 1260 1261 sockopt_lock_sock(sk); 1262 opt = rcu_dereference_protected(np->opt, 1263 lockdep_sock_is_held(sk)); 1264 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len); 1265 sockopt_release_sock(sk); 1266 /* check if ipv6_getsockopt_sticky() returns err code */ 1267 if (len < 0) 1268 return len; 1269 return copy_to_sockptr(optlen, &len, sizeof(int)); 1270 } 1271 1272 case IPV6_RECVHOPOPTS: 1273 val = np->rxopt.bits.hopopts; 1274 break; 1275 1276 case IPV6_2292HOPOPTS: 1277 val = np->rxopt.bits.ohopopts; 1278 break; 1279 1280 case IPV6_RECVDSTOPTS: 1281 val = np->rxopt.bits.dstopts; 1282 break; 1283 1284 case IPV6_2292DSTOPTS: 1285 val = np->rxopt.bits.odstopts; 1286 break; 1287 1288 case IPV6_TCLASS: 1289 val = np->tclass; 1290 break; 1291 1292 case IPV6_RECVTCLASS: 1293 val = np->rxopt.bits.rxtclass; 1294 break; 1295 1296 case IPV6_FLOWINFO: 1297 val = np->rxopt.bits.rxflow; 1298 break; 1299 1300 case IPV6_RECVPATHMTU: 1301 val = np->rxopt.bits.rxpmtu; 1302 break; 1303 1304 case IPV6_PATHMTU: 1305 { 1306 struct dst_entry *dst; 1307 struct ip6_mtuinfo mtuinfo; 1308 1309 if (len < sizeof(mtuinfo)) 1310 return -EINVAL; 1311 1312 len = sizeof(mtuinfo); 1313 memset(&mtuinfo, 0, sizeof(mtuinfo)); 1314 1315 rcu_read_lock(); 1316 dst = __sk_dst_get(sk); 1317 if (dst) 1318 mtuinfo.ip6m_mtu = dst_mtu(dst); 1319 rcu_read_unlock(); 1320 if (!mtuinfo.ip6m_mtu) 1321 return -ENOTCONN; 1322 1323 if (copy_to_sockptr(optlen, &len, sizeof(int))) 1324 return -EFAULT; 1325 if (copy_to_sockptr(optval, &mtuinfo, len)) 1326 return -EFAULT; 1327 1328 return 0; 1329 } 1330 1331 case IPV6_TRANSPARENT: 1332 val = inet_test_bit(TRANSPARENT, sk); 1333 break; 1334 1335 case IPV6_FREEBIND: 1336 val = inet_test_bit(FREEBIND, sk); 1337 break; 1338 1339 case IPV6_RECVORIGDSTADDR: 1340 val = np->rxopt.bits.rxorigdstaddr; 1341 break; 1342 1343 case IPV6_UNICAST_HOPS: 1344 case IPV6_MULTICAST_HOPS: 1345 { 1346 struct dst_entry *dst; 1347 1348 if (optname == IPV6_UNICAST_HOPS) 1349 val = READ_ONCE(np->hop_limit); 1350 else 1351 val = READ_ONCE(np->mcast_hops); 1352 1353 if (val < 0) { 1354 rcu_read_lock(); 1355 dst = __sk_dst_get(sk); 1356 if (dst) 1357 val = ip6_dst_hoplimit(dst); 1358 rcu_read_unlock(); 1359 } 1360 1361 if (val < 0) 1362 val = sock_net(sk)->ipv6.devconf_all->hop_limit; 1363 break; 1364 } 1365 1366 case IPV6_MULTICAST_LOOP: 1367 val = inet6_test_bit(MC6_LOOP, sk); 1368 break; 1369 1370 case IPV6_MULTICAST_IF: 1371 val = np->mcast_oif; 1372 break; 1373 1374 case IPV6_MULTICAST_ALL: 1375 val = np->mc_all; 1376 break; 1377 1378 case IPV6_UNICAST_IF: 1379 val = (__force int)htonl((__u32) np->ucast_oif); 1380 break; 1381 1382 case IPV6_MTU_DISCOVER: 1383 val = np->pmtudisc; 1384 break; 1385 1386 case IPV6_RECVERR: 1387 val = np->recverr; 1388 break; 1389 1390 case IPV6_FLOWINFO_SEND: 1391 val = np->sndflow; 1392 break; 1393 1394 case IPV6_FLOWLABEL_MGR: 1395 { 1396 struct in6_flowlabel_req freq; 1397 int flags; 1398 1399 if (len < sizeof(freq)) 1400 return -EINVAL; 1401 1402 if (copy_from_sockptr(&freq, optval, sizeof(freq))) 1403 return -EFAULT; 1404 1405 if (freq.flr_action != IPV6_FL_A_GET) 1406 return -EINVAL; 1407 1408 len = sizeof(freq); 1409 flags = freq.flr_flags; 1410 1411 memset(&freq, 0, sizeof(freq)); 1412 1413 val = ipv6_flowlabel_opt_get(sk, &freq, flags); 1414 if (val < 0) 1415 return val; 1416 1417 if (copy_to_sockptr(optlen, &len, sizeof(int))) 1418 return -EFAULT; 1419 if (copy_to_sockptr(optval, &freq, len)) 1420 return -EFAULT; 1421 1422 return 0; 1423 } 1424 1425 case IPV6_ADDR_PREFERENCES: 1426 val = 0; 1427 1428 if (np->srcprefs & IPV6_PREFER_SRC_TMP) 1429 val |= IPV6_PREFER_SRC_TMP; 1430 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC) 1431 val |= IPV6_PREFER_SRC_PUBLIC; 1432 else { 1433 /* XXX: should we return system default? */ 1434 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT; 1435 } 1436 1437 if (np->srcprefs & IPV6_PREFER_SRC_COA) 1438 val |= IPV6_PREFER_SRC_COA; 1439 else 1440 val |= IPV6_PREFER_SRC_HOME; 1441 break; 1442 1443 case IPV6_MINHOPCOUNT: 1444 val = READ_ONCE(np->min_hopcount); 1445 break; 1446 1447 case IPV6_DONTFRAG: 1448 val = np->dontfrag; 1449 break; 1450 1451 case IPV6_AUTOFLOWLABEL: 1452 val = ip6_autoflowlabel(sock_net(sk), np); 1453 break; 1454 1455 case IPV6_RECVFRAGSIZE: 1456 val = np->rxopt.bits.recvfragsize; 1457 break; 1458 1459 case IPV6_ROUTER_ALERT_ISOLATE: 1460 val = np->rtalert_isolate; 1461 break; 1462 1463 case IPV6_RECVERR_RFC4884: 1464 val = inet6_test_bit(RECVERR6_RFC4884, sk); 1465 break; 1466 1467 default: 1468 return -ENOPROTOOPT; 1469 } 1470 len = min_t(unsigned int, sizeof(int), len); 1471 if (copy_to_sockptr(optlen, &len, sizeof(int))) 1472 return -EFAULT; 1473 if (copy_to_sockptr(optval, &val, len)) 1474 return -EFAULT; 1475 return 0; 1476 } 1477 1478 int ipv6_getsockopt(struct sock *sk, int level, int optname, 1479 char __user *optval, int __user *optlen) 1480 { 1481 int err; 1482 1483 if (level == SOL_IP && sk->sk_type != SOCK_RAW) 1484 return udp_prot.getsockopt(sk, level, optname, optval, optlen); 1485 1486 if (level != SOL_IPV6) 1487 return -ENOPROTOOPT; 1488 1489 err = do_ipv6_getsockopt(sk, level, optname, 1490 USER_SOCKPTR(optval), USER_SOCKPTR(optlen)); 1491 #ifdef CONFIG_NETFILTER 1492 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1493 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) { 1494 int len; 1495 1496 if (get_user(len, optlen)) 1497 return -EFAULT; 1498 1499 err = nf_getsockopt(sk, PF_INET6, optname, optval, &len); 1500 if (err >= 0) 1501 err = put_user(len, optlen); 1502 } 1503 #endif 1504 return err; 1505 } 1506 EXPORT_SYMBOL(ipv6_getsockopt); 1507