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 } 485 if (needs_rtnl) 486 rtnl_lock(); 487 sockopt_lock_sock(sk); 488 489 /* Another thread has converted the socket into IPv4 with 490 * IPV6_ADDRFORM concurrently. 491 */ 492 if (unlikely(sk->sk_family != AF_INET6)) 493 goto unlock; 494 495 switch (optname) { 496 497 case IPV6_ADDRFORM: 498 if (optlen < sizeof(int)) 499 goto e_inval; 500 if (val == PF_INET) { 501 if (sk->sk_type == SOCK_RAW) 502 break; 503 504 if (sk->sk_protocol == IPPROTO_UDP || 505 sk->sk_protocol == IPPROTO_UDPLITE) { 506 struct udp_sock *up = udp_sk(sk); 507 if (up->pending == AF_INET6) { 508 retv = -EBUSY; 509 break; 510 } 511 } else if (sk->sk_protocol == IPPROTO_TCP) { 512 if (sk->sk_prot != &tcpv6_prot) { 513 retv = -EBUSY; 514 break; 515 } 516 } else { 517 break; 518 } 519 520 if (sk->sk_state != TCP_ESTABLISHED) { 521 retv = -ENOTCONN; 522 break; 523 } 524 525 if (ipv6_only_sock(sk) || 526 !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) { 527 retv = -EADDRNOTAVAIL; 528 break; 529 } 530 531 __ipv6_sock_mc_close(sk); 532 __ipv6_sock_ac_close(sk); 533 534 if (sk->sk_protocol == IPPROTO_TCP) { 535 struct inet_connection_sock *icsk = inet_csk(sk); 536 537 sock_prot_inuse_add(net, sk->sk_prot, -1); 538 sock_prot_inuse_add(net, &tcp_prot, 1); 539 540 /* Paired with READ_ONCE(sk->sk_prot) in inet6_stream_ops */ 541 WRITE_ONCE(sk->sk_prot, &tcp_prot); 542 /* Paired with READ_ONCE() in tcp_(get|set)sockopt() */ 543 WRITE_ONCE(icsk->icsk_af_ops, &ipv4_specific); 544 WRITE_ONCE(sk->sk_socket->ops, &inet_stream_ops); 545 WRITE_ONCE(sk->sk_family, PF_INET); 546 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie); 547 } else { 548 struct proto *prot = &udp_prot; 549 550 if (sk->sk_protocol == IPPROTO_UDPLITE) 551 prot = &udplite_prot; 552 553 sock_prot_inuse_add(net, sk->sk_prot, -1); 554 sock_prot_inuse_add(net, prot, 1); 555 556 /* Paired with READ_ONCE(sk->sk_prot) in inet6_dgram_ops */ 557 WRITE_ONCE(sk->sk_prot, prot); 558 WRITE_ONCE(sk->sk_socket->ops, &inet_dgram_ops); 559 WRITE_ONCE(sk->sk_family, PF_INET); 560 } 561 562 /* Disable all options not to allocate memory anymore, 563 * but there is still a race. See the lockless path 564 * in udpv6_sendmsg() and ipv6_local_rxpmtu(). 565 */ 566 np->rxopt.all = 0; 567 568 inet6_cleanup_sock(sk); 569 570 module_put(THIS_MODULE); 571 retv = 0; 572 break; 573 } 574 goto e_inval; 575 576 case IPV6_V6ONLY: 577 if (optlen < sizeof(int) || 578 inet_sk(sk)->inet_num) 579 goto e_inval; 580 sk->sk_ipv6only = valbool; 581 retv = 0; 582 break; 583 584 case IPV6_RECVPKTINFO: 585 if (optlen < sizeof(int)) 586 goto e_inval; 587 np->rxopt.bits.rxinfo = valbool; 588 retv = 0; 589 break; 590 591 case IPV6_2292PKTINFO: 592 if (optlen < sizeof(int)) 593 goto e_inval; 594 np->rxopt.bits.rxoinfo = valbool; 595 retv = 0; 596 break; 597 598 case IPV6_RECVHOPLIMIT: 599 if (optlen < sizeof(int)) 600 goto e_inval; 601 np->rxopt.bits.rxhlim = valbool; 602 retv = 0; 603 break; 604 605 case IPV6_2292HOPLIMIT: 606 if (optlen < sizeof(int)) 607 goto e_inval; 608 np->rxopt.bits.rxohlim = valbool; 609 retv = 0; 610 break; 611 612 case IPV6_RECVRTHDR: 613 if (optlen < sizeof(int)) 614 goto e_inval; 615 np->rxopt.bits.srcrt = valbool; 616 retv = 0; 617 break; 618 619 case IPV6_2292RTHDR: 620 if (optlen < sizeof(int)) 621 goto e_inval; 622 np->rxopt.bits.osrcrt = valbool; 623 retv = 0; 624 break; 625 626 case IPV6_RECVHOPOPTS: 627 if (optlen < sizeof(int)) 628 goto e_inval; 629 np->rxopt.bits.hopopts = valbool; 630 retv = 0; 631 break; 632 633 case IPV6_2292HOPOPTS: 634 if (optlen < sizeof(int)) 635 goto e_inval; 636 np->rxopt.bits.ohopopts = valbool; 637 retv = 0; 638 break; 639 640 case IPV6_RECVDSTOPTS: 641 if (optlen < sizeof(int)) 642 goto e_inval; 643 np->rxopt.bits.dstopts = valbool; 644 retv = 0; 645 break; 646 647 case IPV6_2292DSTOPTS: 648 if (optlen < sizeof(int)) 649 goto e_inval; 650 np->rxopt.bits.odstopts = valbool; 651 retv = 0; 652 break; 653 654 case IPV6_TCLASS: 655 if (optlen < sizeof(int)) 656 goto e_inval; 657 if (val < -1 || val > 0xff) 658 goto e_inval; 659 /* RFC 3542, 6.5: default traffic class of 0x0 */ 660 if (val == -1) 661 val = 0; 662 if (sk->sk_type == SOCK_STREAM) { 663 val &= ~INET_ECN_MASK; 664 val |= np->tclass & INET_ECN_MASK; 665 } 666 if (np->tclass != val) { 667 np->tclass = val; 668 sk_dst_reset(sk); 669 } 670 retv = 0; 671 break; 672 673 case IPV6_RECVTCLASS: 674 if (optlen < sizeof(int)) 675 goto e_inval; 676 np->rxopt.bits.rxtclass = valbool; 677 retv = 0; 678 break; 679 680 case IPV6_FLOWINFO: 681 if (optlen < sizeof(int)) 682 goto e_inval; 683 np->rxopt.bits.rxflow = valbool; 684 retv = 0; 685 break; 686 687 case IPV6_RECVPATHMTU: 688 if (optlen < sizeof(int)) 689 goto e_inval; 690 np->rxopt.bits.rxpmtu = valbool; 691 retv = 0; 692 break; 693 694 case IPV6_TRANSPARENT: 695 if (valbool && !sockopt_ns_capable(net->user_ns, CAP_NET_RAW) && 696 !sockopt_ns_capable(net->user_ns, CAP_NET_ADMIN)) { 697 retv = -EPERM; 698 break; 699 } 700 if (optlen < sizeof(int)) 701 goto e_inval; 702 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */ 703 inet_assign_bit(TRANSPARENT, sk, valbool); 704 retv = 0; 705 break; 706 707 case IPV6_FREEBIND: 708 if (optlen < sizeof(int)) 709 goto e_inval; 710 /* we also don't have a separate freebind bit for IPV6 */ 711 inet_assign_bit(FREEBIND, sk, valbool); 712 retv = 0; 713 break; 714 715 case IPV6_RECVORIGDSTADDR: 716 if (optlen < sizeof(int)) 717 goto e_inval; 718 np->rxopt.bits.rxorigdstaddr = valbool; 719 retv = 0; 720 break; 721 722 case IPV6_HOPOPTS: 723 case IPV6_RTHDRDSTOPTS: 724 case IPV6_RTHDR: 725 case IPV6_DSTOPTS: 726 retv = ipv6_set_opt_hdr(sk, optname, optval, optlen); 727 break; 728 729 case IPV6_PKTINFO: 730 { 731 struct in6_pktinfo pkt; 732 733 if (optlen == 0) 734 goto e_inval; 735 else if (optlen < sizeof(struct in6_pktinfo) || 736 sockptr_is_null(optval)) 737 goto e_inval; 738 739 if (copy_from_sockptr(&pkt, optval, sizeof(pkt))) { 740 retv = -EFAULT; 741 break; 742 } 743 if (!sk_dev_equal_l3scope(sk, pkt.ipi6_ifindex)) 744 goto e_inval; 745 746 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex; 747 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr; 748 retv = 0; 749 break; 750 } 751 752 case IPV6_2292PKTOPTIONS: 753 { 754 struct ipv6_txoptions *opt = NULL; 755 struct msghdr msg; 756 struct flowi6 fl6; 757 struct ipcm6_cookie ipc6; 758 759 memset(&fl6, 0, sizeof(fl6)); 760 fl6.flowi6_oif = sk->sk_bound_dev_if; 761 fl6.flowi6_mark = sk->sk_mark; 762 763 if (optlen == 0) 764 goto update; 765 766 /* 1K is probably excessive 767 * 1K is surely not enough, 2K per standard header is 16K. 768 */ 769 retv = -EINVAL; 770 if (optlen > 64*1024) 771 break; 772 773 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL); 774 retv = -ENOBUFS; 775 if (!opt) 776 break; 777 778 memset(opt, 0, sizeof(*opt)); 779 refcount_set(&opt->refcnt, 1); 780 opt->tot_len = sizeof(*opt) + optlen; 781 retv = -EFAULT; 782 if (copy_from_sockptr(opt + 1, optval, optlen)) 783 goto done; 784 785 msg.msg_controllen = optlen; 786 msg.msg_control_is_user = false; 787 msg.msg_control = (void *)(opt+1); 788 ipc6.opt = opt; 789 790 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6); 791 if (retv) 792 goto done; 793 update: 794 retv = 0; 795 opt = ipv6_update_options(sk, opt); 796 done: 797 if (opt) { 798 atomic_sub(opt->tot_len, &sk->sk_omem_alloc); 799 txopt_put(opt); 800 } 801 break; 802 } 803 804 805 case IPV6_UNICAST_IF: 806 { 807 struct net_device *dev = NULL; 808 int ifindex; 809 810 if (optlen != sizeof(int)) 811 goto e_inval; 812 813 ifindex = (__force int)ntohl((__force __be32)val); 814 if (ifindex == 0) { 815 np->ucast_oif = 0; 816 retv = 0; 817 break; 818 } 819 820 dev = dev_get_by_index(net, ifindex); 821 retv = -EADDRNOTAVAIL; 822 if (!dev) 823 break; 824 dev_put(dev); 825 826 retv = -EINVAL; 827 if (sk->sk_bound_dev_if) 828 break; 829 830 np->ucast_oif = ifindex; 831 retv = 0; 832 break; 833 } 834 835 case IPV6_MULTICAST_IF: 836 if (sk->sk_type == SOCK_STREAM) 837 break; 838 if (optlen < sizeof(int)) 839 goto e_inval; 840 841 if (val) { 842 struct net_device *dev; 843 int midx; 844 845 rcu_read_lock(); 846 847 dev = dev_get_by_index_rcu(net, val); 848 if (!dev) { 849 rcu_read_unlock(); 850 retv = -ENODEV; 851 break; 852 } 853 midx = l3mdev_master_ifindex_rcu(dev); 854 855 rcu_read_unlock(); 856 857 if (sk->sk_bound_dev_if && 858 sk->sk_bound_dev_if != val && 859 (!midx || midx != sk->sk_bound_dev_if)) 860 goto e_inval; 861 } 862 np->mcast_oif = val; 863 retv = 0; 864 break; 865 case IPV6_ADD_MEMBERSHIP: 866 case IPV6_DROP_MEMBERSHIP: 867 { 868 struct ipv6_mreq mreq; 869 870 if (optlen < sizeof(struct ipv6_mreq)) 871 goto e_inval; 872 873 retv = -EPROTO; 874 if (inet_test_bit(IS_ICSK, sk)) 875 break; 876 877 retv = -EFAULT; 878 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq))) 879 break; 880 881 if (optname == IPV6_ADD_MEMBERSHIP) 882 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr); 883 else 884 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr); 885 break; 886 } 887 case IPV6_JOIN_ANYCAST: 888 case IPV6_LEAVE_ANYCAST: 889 { 890 struct ipv6_mreq mreq; 891 892 if (optlen < sizeof(struct ipv6_mreq)) 893 goto e_inval; 894 895 retv = -EFAULT; 896 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq))) 897 break; 898 899 if (optname == IPV6_JOIN_ANYCAST) 900 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr); 901 else 902 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr); 903 break; 904 } 905 case MCAST_JOIN_GROUP: 906 case MCAST_LEAVE_GROUP: 907 if (in_compat_syscall()) 908 retv = compat_ipv6_mcast_join_leave(sk, optname, optval, 909 optlen); 910 else 911 retv = ipv6_mcast_join_leave(sk, optname, optval, 912 optlen); 913 break; 914 case MCAST_JOIN_SOURCE_GROUP: 915 case MCAST_LEAVE_SOURCE_GROUP: 916 case MCAST_BLOCK_SOURCE: 917 case MCAST_UNBLOCK_SOURCE: 918 retv = do_ipv6_mcast_group_source(sk, optname, optval, optlen); 919 break; 920 case MCAST_MSFILTER: 921 if (in_compat_syscall()) 922 retv = compat_ipv6_set_mcast_msfilter(sk, optval, 923 optlen); 924 else 925 retv = ipv6_set_mcast_msfilter(sk, optval, optlen); 926 break; 927 case IPV6_ROUTER_ALERT: 928 if (optlen < sizeof(int)) 929 goto e_inval; 930 retv = ip6_ra_control(sk, val); 931 break; 932 case IPV6_ROUTER_ALERT_ISOLATE: 933 if (optlen < sizeof(int)) 934 goto e_inval; 935 np->rtalert_isolate = valbool; 936 retv = 0; 937 break; 938 case IPV6_MTU_DISCOVER: 939 if (optlen < sizeof(int)) 940 goto e_inval; 941 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT) 942 goto e_inval; 943 np->pmtudisc = val; 944 retv = 0; 945 break; 946 case IPV6_RECVERR: 947 if (optlen < sizeof(int)) 948 goto e_inval; 949 np->recverr = valbool; 950 if (!val) 951 skb_errqueue_purge(&sk->sk_error_queue); 952 retv = 0; 953 break; 954 case IPV6_FLOWINFO_SEND: 955 if (optlen < sizeof(int)) 956 goto e_inval; 957 np->sndflow = valbool; 958 retv = 0; 959 break; 960 case IPV6_FLOWLABEL_MGR: 961 retv = ipv6_flowlabel_opt(sk, optval, optlen); 962 break; 963 case IPV6_IPSEC_POLICY: 964 case IPV6_XFRM_POLICY: 965 retv = -EPERM; 966 if (!sockopt_ns_capable(net->user_ns, CAP_NET_ADMIN)) 967 break; 968 retv = xfrm_user_policy(sk, optname, optval, optlen); 969 break; 970 971 case IPV6_ADDR_PREFERENCES: 972 if (optlen < sizeof(int)) 973 goto e_inval; 974 retv = __ip6_sock_set_addr_preferences(sk, val); 975 break; 976 case IPV6_RECVFRAGSIZE: 977 np->rxopt.bits.recvfragsize = valbool; 978 retv = 0; 979 break; 980 } 981 982 unlock: 983 sockopt_release_sock(sk); 984 if (needs_rtnl) 985 rtnl_unlock(); 986 987 return retv; 988 989 e_inval: 990 retv = -EINVAL; 991 goto unlock; 992 } 993 994 int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, 995 unsigned int optlen) 996 { 997 int err; 998 999 if (level == SOL_IP && sk->sk_type != SOCK_RAW) 1000 return udp_prot.setsockopt(sk, level, optname, optval, optlen); 1001 1002 if (level != SOL_IPV6) 1003 return -ENOPROTOOPT; 1004 1005 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen); 1006 #ifdef CONFIG_NETFILTER 1007 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1008 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY && 1009 optname != IPV6_XFRM_POLICY) 1010 err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen); 1011 #endif 1012 return err; 1013 } 1014 EXPORT_SYMBOL(ipv6_setsockopt); 1015 1016 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt, 1017 int optname, sockptr_t optval, int len) 1018 { 1019 struct ipv6_opt_hdr *hdr; 1020 1021 if (!opt) 1022 return 0; 1023 1024 switch (optname) { 1025 case IPV6_HOPOPTS: 1026 hdr = opt->hopopt; 1027 break; 1028 case IPV6_RTHDRDSTOPTS: 1029 hdr = opt->dst0opt; 1030 break; 1031 case IPV6_RTHDR: 1032 hdr = (struct ipv6_opt_hdr *)opt->srcrt; 1033 break; 1034 case IPV6_DSTOPTS: 1035 hdr = opt->dst1opt; 1036 break; 1037 default: 1038 return -EINVAL; /* should not happen */ 1039 } 1040 1041 if (!hdr) 1042 return 0; 1043 1044 len = min_t(unsigned int, len, ipv6_optlen(hdr)); 1045 if (copy_to_sockptr(optval, hdr, len)) 1046 return -EFAULT; 1047 return len; 1048 } 1049 1050 static int ipv6_get_msfilter(struct sock *sk, sockptr_t optval, 1051 sockptr_t optlen, int len) 1052 { 1053 const int size0 = offsetof(struct group_filter, gf_slist_flex); 1054 struct group_filter gsf; 1055 int num; 1056 int err; 1057 1058 if (len < size0) 1059 return -EINVAL; 1060 if (copy_from_sockptr(&gsf, optval, size0)) 1061 return -EFAULT; 1062 if (gsf.gf_group.ss_family != AF_INET6) 1063 return -EADDRNOTAVAIL; 1064 num = gsf.gf_numsrc; 1065 sockopt_lock_sock(sk); 1066 err = ip6_mc_msfget(sk, &gsf, optval, size0); 1067 if (!err) { 1068 if (num > gsf.gf_numsrc) 1069 num = gsf.gf_numsrc; 1070 len = GROUP_FILTER_SIZE(num); 1071 if (copy_to_sockptr(optlen, &len, sizeof(int)) || 1072 copy_to_sockptr(optval, &gsf, size0)) 1073 err = -EFAULT; 1074 } 1075 sockopt_release_sock(sk); 1076 return err; 1077 } 1078 1079 static int compat_ipv6_get_msfilter(struct sock *sk, sockptr_t optval, 1080 sockptr_t optlen, int len) 1081 { 1082 const int size0 = offsetof(struct compat_group_filter, gf_slist_flex); 1083 struct compat_group_filter gf32; 1084 struct group_filter gf; 1085 int err; 1086 int num; 1087 1088 if (len < size0) 1089 return -EINVAL; 1090 1091 if (copy_from_sockptr(&gf32, optval, size0)) 1092 return -EFAULT; 1093 gf.gf_interface = gf32.gf_interface; 1094 gf.gf_fmode = gf32.gf_fmode; 1095 num = gf.gf_numsrc = gf32.gf_numsrc; 1096 gf.gf_group = gf32.gf_group; 1097 1098 if (gf.gf_group.ss_family != AF_INET6) 1099 return -EADDRNOTAVAIL; 1100 1101 sockopt_lock_sock(sk); 1102 err = ip6_mc_msfget(sk, &gf, optval, size0); 1103 sockopt_release_sock(sk); 1104 if (err) 1105 return err; 1106 if (num > gf.gf_numsrc) 1107 num = gf.gf_numsrc; 1108 len = GROUP_FILTER_SIZE(num) - (sizeof(gf)-sizeof(gf32)); 1109 if (copy_to_sockptr(optlen, &len, sizeof(int)) || 1110 copy_to_sockptr_offset(optval, offsetof(struct compat_group_filter, gf_fmode), 1111 &gf.gf_fmode, sizeof(gf32.gf_fmode)) || 1112 copy_to_sockptr_offset(optval, offsetof(struct compat_group_filter, gf_numsrc), 1113 &gf.gf_numsrc, sizeof(gf32.gf_numsrc))) 1114 return -EFAULT; 1115 return 0; 1116 } 1117 1118 int do_ipv6_getsockopt(struct sock *sk, int level, int optname, 1119 sockptr_t optval, sockptr_t optlen) 1120 { 1121 struct ipv6_pinfo *np = inet6_sk(sk); 1122 int len; 1123 int val; 1124 1125 if (ip6_mroute_opt(optname)) 1126 return ip6_mroute_getsockopt(sk, optname, optval, optlen); 1127 1128 if (copy_from_sockptr(&len, optlen, sizeof(int))) 1129 return -EFAULT; 1130 switch (optname) { 1131 case IPV6_ADDRFORM: 1132 if (sk->sk_protocol != IPPROTO_UDP && 1133 sk->sk_protocol != IPPROTO_UDPLITE && 1134 sk->sk_protocol != IPPROTO_TCP) 1135 return -ENOPROTOOPT; 1136 if (sk->sk_state != TCP_ESTABLISHED) 1137 return -ENOTCONN; 1138 val = sk->sk_family; 1139 break; 1140 case MCAST_MSFILTER: 1141 if (in_compat_syscall()) 1142 return compat_ipv6_get_msfilter(sk, optval, optlen, len); 1143 return ipv6_get_msfilter(sk, optval, optlen, len); 1144 case IPV6_2292PKTOPTIONS: 1145 { 1146 struct msghdr msg; 1147 struct sk_buff *skb; 1148 1149 if (sk->sk_type != SOCK_STREAM) 1150 return -ENOPROTOOPT; 1151 1152 if (optval.is_kernel) { 1153 msg.msg_control_is_user = false; 1154 msg.msg_control = optval.kernel; 1155 } else { 1156 msg.msg_control_is_user = true; 1157 msg.msg_control_user = optval.user; 1158 } 1159 msg.msg_controllen = len; 1160 msg.msg_flags = 0; 1161 1162 sockopt_lock_sock(sk); 1163 skb = np->pktoptions; 1164 if (skb) 1165 ip6_datagram_recv_ctl(sk, &msg, skb); 1166 sockopt_release_sock(sk); 1167 if (!skb) { 1168 if (np->rxopt.bits.rxinfo) { 1169 struct in6_pktinfo src_info; 1170 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif : 1171 np->sticky_pktinfo.ipi6_ifindex; 1172 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr; 1173 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info); 1174 } 1175 if (np->rxopt.bits.rxhlim) { 1176 int hlim = READ_ONCE(np->mcast_hops); 1177 1178 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); 1179 } 1180 if (np->rxopt.bits.rxtclass) { 1181 int tclass = (int)ip6_tclass(np->rcv_flowinfo); 1182 1183 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass); 1184 } 1185 if (np->rxopt.bits.rxoinfo) { 1186 struct in6_pktinfo src_info; 1187 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif : 1188 np->sticky_pktinfo.ipi6_ifindex; 1189 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : 1190 np->sticky_pktinfo.ipi6_addr; 1191 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); 1192 } 1193 if (np->rxopt.bits.rxohlim) { 1194 int hlim = READ_ONCE(np->mcast_hops); 1195 1196 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); 1197 } 1198 if (np->rxopt.bits.rxflow) { 1199 __be32 flowinfo = np->rcv_flowinfo; 1200 1201 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo); 1202 } 1203 } 1204 len -= msg.msg_controllen; 1205 return copy_to_sockptr(optlen, &len, sizeof(int)); 1206 } 1207 case IPV6_MTU: 1208 { 1209 struct dst_entry *dst; 1210 1211 val = 0; 1212 rcu_read_lock(); 1213 dst = __sk_dst_get(sk); 1214 if (dst) 1215 val = dst_mtu(dst); 1216 rcu_read_unlock(); 1217 if (!val) 1218 return -ENOTCONN; 1219 break; 1220 } 1221 1222 case IPV6_V6ONLY: 1223 val = sk->sk_ipv6only; 1224 break; 1225 1226 case IPV6_RECVPKTINFO: 1227 val = np->rxopt.bits.rxinfo; 1228 break; 1229 1230 case IPV6_2292PKTINFO: 1231 val = np->rxopt.bits.rxoinfo; 1232 break; 1233 1234 case IPV6_RECVHOPLIMIT: 1235 val = np->rxopt.bits.rxhlim; 1236 break; 1237 1238 case IPV6_2292HOPLIMIT: 1239 val = np->rxopt.bits.rxohlim; 1240 break; 1241 1242 case IPV6_RECVRTHDR: 1243 val = np->rxopt.bits.srcrt; 1244 break; 1245 1246 case IPV6_2292RTHDR: 1247 val = np->rxopt.bits.osrcrt; 1248 break; 1249 1250 case IPV6_HOPOPTS: 1251 case IPV6_RTHDRDSTOPTS: 1252 case IPV6_RTHDR: 1253 case IPV6_DSTOPTS: 1254 { 1255 struct ipv6_txoptions *opt; 1256 1257 sockopt_lock_sock(sk); 1258 opt = rcu_dereference_protected(np->opt, 1259 lockdep_sock_is_held(sk)); 1260 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len); 1261 sockopt_release_sock(sk); 1262 /* check if ipv6_getsockopt_sticky() returns err code */ 1263 if (len < 0) 1264 return len; 1265 return copy_to_sockptr(optlen, &len, sizeof(int)); 1266 } 1267 1268 case IPV6_RECVHOPOPTS: 1269 val = np->rxopt.bits.hopopts; 1270 break; 1271 1272 case IPV6_2292HOPOPTS: 1273 val = np->rxopt.bits.ohopopts; 1274 break; 1275 1276 case IPV6_RECVDSTOPTS: 1277 val = np->rxopt.bits.dstopts; 1278 break; 1279 1280 case IPV6_2292DSTOPTS: 1281 val = np->rxopt.bits.odstopts; 1282 break; 1283 1284 case IPV6_TCLASS: 1285 val = np->tclass; 1286 break; 1287 1288 case IPV6_RECVTCLASS: 1289 val = np->rxopt.bits.rxtclass; 1290 break; 1291 1292 case IPV6_FLOWINFO: 1293 val = np->rxopt.bits.rxflow; 1294 break; 1295 1296 case IPV6_RECVPATHMTU: 1297 val = np->rxopt.bits.rxpmtu; 1298 break; 1299 1300 case IPV6_PATHMTU: 1301 { 1302 struct dst_entry *dst; 1303 struct ip6_mtuinfo mtuinfo; 1304 1305 if (len < sizeof(mtuinfo)) 1306 return -EINVAL; 1307 1308 len = sizeof(mtuinfo); 1309 memset(&mtuinfo, 0, sizeof(mtuinfo)); 1310 1311 rcu_read_lock(); 1312 dst = __sk_dst_get(sk); 1313 if (dst) 1314 mtuinfo.ip6m_mtu = dst_mtu(dst); 1315 rcu_read_unlock(); 1316 if (!mtuinfo.ip6m_mtu) 1317 return -ENOTCONN; 1318 1319 if (copy_to_sockptr(optlen, &len, sizeof(int))) 1320 return -EFAULT; 1321 if (copy_to_sockptr(optval, &mtuinfo, len)) 1322 return -EFAULT; 1323 1324 return 0; 1325 } 1326 1327 case IPV6_TRANSPARENT: 1328 val = inet_test_bit(TRANSPARENT, sk); 1329 break; 1330 1331 case IPV6_FREEBIND: 1332 val = inet_test_bit(FREEBIND, sk); 1333 break; 1334 1335 case IPV6_RECVORIGDSTADDR: 1336 val = np->rxopt.bits.rxorigdstaddr; 1337 break; 1338 1339 case IPV6_UNICAST_HOPS: 1340 case IPV6_MULTICAST_HOPS: 1341 { 1342 struct dst_entry *dst; 1343 1344 if (optname == IPV6_UNICAST_HOPS) 1345 val = READ_ONCE(np->hop_limit); 1346 else 1347 val = READ_ONCE(np->mcast_hops); 1348 1349 if (val < 0) { 1350 rcu_read_lock(); 1351 dst = __sk_dst_get(sk); 1352 if (dst) 1353 val = ip6_dst_hoplimit(dst); 1354 rcu_read_unlock(); 1355 } 1356 1357 if (val < 0) 1358 val = sock_net(sk)->ipv6.devconf_all->hop_limit; 1359 break; 1360 } 1361 1362 case IPV6_MULTICAST_LOOP: 1363 val = inet6_test_bit(MC6_LOOP, sk); 1364 break; 1365 1366 case IPV6_MULTICAST_IF: 1367 val = np->mcast_oif; 1368 break; 1369 1370 case IPV6_MULTICAST_ALL: 1371 val = inet6_test_bit(MC6_ALL, sk); 1372 break; 1373 1374 case IPV6_UNICAST_IF: 1375 val = (__force int)htonl((__u32) np->ucast_oif); 1376 break; 1377 1378 case IPV6_MTU_DISCOVER: 1379 val = np->pmtudisc; 1380 break; 1381 1382 case IPV6_RECVERR: 1383 val = np->recverr; 1384 break; 1385 1386 case IPV6_FLOWINFO_SEND: 1387 val = np->sndflow; 1388 break; 1389 1390 case IPV6_FLOWLABEL_MGR: 1391 { 1392 struct in6_flowlabel_req freq; 1393 int flags; 1394 1395 if (len < sizeof(freq)) 1396 return -EINVAL; 1397 1398 if (copy_from_sockptr(&freq, optval, sizeof(freq))) 1399 return -EFAULT; 1400 1401 if (freq.flr_action != IPV6_FL_A_GET) 1402 return -EINVAL; 1403 1404 len = sizeof(freq); 1405 flags = freq.flr_flags; 1406 1407 memset(&freq, 0, sizeof(freq)); 1408 1409 val = ipv6_flowlabel_opt_get(sk, &freq, flags); 1410 if (val < 0) 1411 return val; 1412 1413 if (copy_to_sockptr(optlen, &len, sizeof(int))) 1414 return -EFAULT; 1415 if (copy_to_sockptr(optval, &freq, len)) 1416 return -EFAULT; 1417 1418 return 0; 1419 } 1420 1421 case IPV6_ADDR_PREFERENCES: 1422 val = 0; 1423 1424 if (np->srcprefs & IPV6_PREFER_SRC_TMP) 1425 val |= IPV6_PREFER_SRC_TMP; 1426 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC) 1427 val |= IPV6_PREFER_SRC_PUBLIC; 1428 else { 1429 /* XXX: should we return system default? */ 1430 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT; 1431 } 1432 1433 if (np->srcprefs & IPV6_PREFER_SRC_COA) 1434 val |= IPV6_PREFER_SRC_COA; 1435 else 1436 val |= IPV6_PREFER_SRC_HOME; 1437 break; 1438 1439 case IPV6_MINHOPCOUNT: 1440 val = READ_ONCE(np->min_hopcount); 1441 break; 1442 1443 case IPV6_DONTFRAG: 1444 val = inet6_test_bit(DONTFRAG, sk); 1445 break; 1446 1447 case IPV6_AUTOFLOWLABEL: 1448 val = ip6_autoflowlabel(sock_net(sk), sk); 1449 break; 1450 1451 case IPV6_RECVFRAGSIZE: 1452 val = np->rxopt.bits.recvfragsize; 1453 break; 1454 1455 case IPV6_ROUTER_ALERT_ISOLATE: 1456 val = np->rtalert_isolate; 1457 break; 1458 1459 case IPV6_RECVERR_RFC4884: 1460 val = inet6_test_bit(RECVERR6_RFC4884, sk); 1461 break; 1462 1463 default: 1464 return -ENOPROTOOPT; 1465 } 1466 len = min_t(unsigned int, sizeof(int), len); 1467 if (copy_to_sockptr(optlen, &len, sizeof(int))) 1468 return -EFAULT; 1469 if (copy_to_sockptr(optval, &val, len)) 1470 return -EFAULT; 1471 return 0; 1472 } 1473 1474 int ipv6_getsockopt(struct sock *sk, int level, int optname, 1475 char __user *optval, int __user *optlen) 1476 { 1477 int err; 1478 1479 if (level == SOL_IP && sk->sk_type != SOCK_RAW) 1480 return udp_prot.getsockopt(sk, level, optname, optval, optlen); 1481 1482 if (level != SOL_IPV6) 1483 return -ENOPROTOOPT; 1484 1485 err = do_ipv6_getsockopt(sk, level, optname, 1486 USER_SOCKPTR(optval), USER_SOCKPTR(optlen)); 1487 #ifdef CONFIG_NETFILTER 1488 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1489 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) { 1490 int len; 1491 1492 if (get_user(len, optlen)) 1493 return -EFAULT; 1494 1495 err = nf_getsockopt(sk, PF_INET6, optname, optval, &len); 1496 if (err >= 0) 1497 err = put_user(len, optlen); 1498 } 1499 #endif 1500 return err; 1501 } 1502 EXPORT_SYMBOL(ipv6_getsockopt); 1503