1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * IPv6 BSD socket options interface 4 * Linux INET6 implementation 5 * 6 * Authors: 7 * Pedro Roque <roque@di.fc.ul.pt> 8 * 9 * Based on linux/net/ipv4/ip_sockglue.c 10 * 11 * FIXME: Make the setsockopt code POSIX compliant: That is 12 * 13 * o Truncate getsockopt returns 14 * o Return an optlen of the truncated length if need be 15 * 16 * Changes: 17 * David L Stevens <dlstevens@us.ibm.com>: 18 * - added multicast source filtering API for MLDv2 19 */ 20 21 #include <linux/module.h> 22 #include <linux/capability.h> 23 #include <linux/errno.h> 24 #include <linux/types.h> 25 #include <linux/socket.h> 26 #include <linux/sockios.h> 27 #include <linux/net.h> 28 #include <linux/in6.h> 29 #include <linux/mroute6.h> 30 #include <linux/netdevice.h> 31 #include <linux/if_arp.h> 32 #include <linux/init.h> 33 #include <linux/sysctl.h> 34 #include <linux/netfilter.h> 35 #include <linux/slab.h> 36 37 #include <net/sock.h> 38 #include <net/snmp.h> 39 #include <net/ipv6.h> 40 #include <net/ndisc.h> 41 #include <net/protocol.h> 42 #include <net/transp_v6.h> 43 #include <net/ip6_route.h> 44 #include <net/addrconf.h> 45 #include <net/inet_common.h> 46 #include <net/tcp.h> 47 #include <net/udp.h> 48 #include <net/udplite.h> 49 #include <net/xfrm.h> 50 #include <net/compat.h> 51 #include <net/seg6.h> 52 53 #include <linux/uaccess.h> 54 55 struct ip6_ra_chain *ip6_ra_chain; 56 DEFINE_RWLOCK(ip6_ra_lock); 57 58 DEFINE_STATIC_KEY_FALSE(ip6_min_hopcount); 59 60 int ip6_ra_control(struct sock *sk, int sel) 61 { 62 struct ip6_ra_chain *ra, *new_ra, **rap; 63 64 /* RA packet may be delivered ONLY to IPPROTO_RAW socket */ 65 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num != IPPROTO_RAW) 66 return -ENOPROTOOPT; 67 68 new_ra = (sel >= 0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL; 69 if (sel >= 0 && !new_ra) 70 return -ENOMEM; 71 72 write_lock_bh(&ip6_ra_lock); 73 for (rap = &ip6_ra_chain; (ra = *rap) != NULL; rap = &ra->next) { 74 if (ra->sk == sk) { 75 if (sel >= 0) { 76 write_unlock_bh(&ip6_ra_lock); 77 kfree(new_ra); 78 return -EADDRINUSE; 79 } 80 81 *rap = ra->next; 82 write_unlock_bh(&ip6_ra_lock); 83 84 sock_put(sk); 85 kfree(ra); 86 return 0; 87 } 88 } 89 if (!new_ra) { 90 write_unlock_bh(&ip6_ra_lock); 91 return -ENOBUFS; 92 } 93 new_ra->sk = sk; 94 new_ra->sel = sel; 95 new_ra->next = ra; 96 *rap = new_ra; 97 sock_hold(sk); 98 write_unlock_bh(&ip6_ra_lock); 99 return 0; 100 } 101 102 struct ipv6_txoptions *ipv6_update_options(struct sock *sk, 103 struct ipv6_txoptions *opt) 104 { 105 if (inet_test_bit(IS_ICSK, sk)) { 106 if (opt && 107 !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) && 108 inet_sk(sk)->inet_daddr != LOOPBACK4_IPV6) { 109 struct inet_connection_sock *icsk = inet_csk(sk); 110 icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen; 111 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie); 112 } 113 } 114 opt = xchg((__force struct ipv6_txoptions **)&inet6_sk(sk)->opt, 115 opt); 116 sk_dst_reset(sk); 117 118 return opt; 119 } 120 121 static bool setsockopt_needs_rtnl(int optname) 122 { 123 switch (optname) { 124 case IPV6_ADDRFORM: 125 case IPV6_ADD_MEMBERSHIP: 126 case IPV6_DROP_MEMBERSHIP: 127 case IPV6_JOIN_ANYCAST: 128 case IPV6_LEAVE_ANYCAST: 129 case MCAST_JOIN_GROUP: 130 case MCAST_LEAVE_GROUP: 131 case MCAST_JOIN_SOURCE_GROUP: 132 case MCAST_LEAVE_SOURCE_GROUP: 133 case MCAST_BLOCK_SOURCE: 134 case MCAST_UNBLOCK_SOURCE: 135 case MCAST_MSFILTER: 136 return true; 137 } 138 return false; 139 } 140 141 static int copy_group_source_from_sockptr(struct group_source_req *greqs, 142 sockptr_t optval, int optlen) 143 { 144 if (in_compat_syscall()) { 145 struct compat_group_source_req gr32; 146 147 if (optlen < sizeof(gr32)) 148 return -EINVAL; 149 if (copy_from_sockptr(&gr32, optval, sizeof(gr32))) 150 return -EFAULT; 151 greqs->gsr_interface = gr32.gsr_interface; 152 greqs->gsr_group = gr32.gsr_group; 153 greqs->gsr_source = gr32.gsr_source; 154 } else { 155 if (optlen < sizeof(*greqs)) 156 return -EINVAL; 157 if (copy_from_sockptr(greqs, optval, sizeof(*greqs))) 158 return -EFAULT; 159 } 160 161 return 0; 162 } 163 164 static int do_ipv6_mcast_group_source(struct sock *sk, int optname, 165 sockptr_t optval, int optlen) 166 { 167 struct group_source_req greqs; 168 int omode, add; 169 int ret; 170 171 ret = copy_group_source_from_sockptr(&greqs, optval, optlen); 172 if (ret) 173 return ret; 174 175 if (greqs.gsr_group.ss_family != AF_INET6 || 176 greqs.gsr_source.ss_family != AF_INET6) 177 return -EADDRNOTAVAIL; 178 179 if (optname == MCAST_BLOCK_SOURCE) { 180 omode = MCAST_EXCLUDE; 181 add = 1; 182 } else if (optname == MCAST_UNBLOCK_SOURCE) { 183 omode = MCAST_EXCLUDE; 184 add = 0; 185 } else if (optname == MCAST_JOIN_SOURCE_GROUP) { 186 struct sockaddr_in6 *psin6; 187 int retv; 188 189 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group; 190 retv = ipv6_sock_mc_join_ssm(sk, greqs.gsr_interface, 191 &psin6->sin6_addr, 192 MCAST_INCLUDE); 193 /* prior join w/ different source is ok */ 194 if (retv && retv != -EADDRINUSE) 195 return retv; 196 omode = MCAST_INCLUDE; 197 add = 1; 198 } else /* MCAST_LEAVE_SOURCE_GROUP */ { 199 omode = MCAST_INCLUDE; 200 add = 0; 201 } 202 return ip6_mc_source(add, omode, sk, &greqs); 203 } 204 205 static int ipv6_set_mcast_msfilter(struct sock *sk, sockptr_t optval, 206 int optlen) 207 { 208 struct group_filter *gsf; 209 int ret; 210 211 if (optlen < GROUP_FILTER_SIZE(0)) 212 return -EINVAL; 213 if (optlen > READ_ONCE(sysctl_optmem_max)) 214 return -ENOBUFS; 215 216 gsf = memdup_sockptr(optval, optlen); 217 if (IS_ERR(gsf)) 218 return PTR_ERR(gsf); 219 220 /* numsrc >= (4G-140)/128 overflow in 32 bits */ 221 ret = -ENOBUFS; 222 if (gsf->gf_numsrc >= 0x1ffffffU || 223 gsf->gf_numsrc > sysctl_mld_max_msf) 224 goto out_free_gsf; 225 226 ret = -EINVAL; 227 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) 228 goto out_free_gsf; 229 230 ret = ip6_mc_msfilter(sk, gsf, gsf->gf_slist_flex); 231 out_free_gsf: 232 kfree(gsf); 233 return ret; 234 } 235 236 static int compat_ipv6_set_mcast_msfilter(struct sock *sk, sockptr_t optval, 237 int optlen) 238 { 239 const int size0 = offsetof(struct compat_group_filter, gf_slist_flex); 240 struct compat_group_filter *gf32; 241 void *p; 242 int ret; 243 int n; 244 245 if (optlen < size0) 246 return -EINVAL; 247 if (optlen > READ_ONCE(sysctl_optmem_max) - 4) 248 return -ENOBUFS; 249 250 p = kmalloc(optlen + 4, GFP_KERNEL); 251 if (!p) 252 return -ENOMEM; 253 254 gf32 = p + 4; /* we want ->gf_group and ->gf_slist_flex aligned */ 255 ret = -EFAULT; 256 if (copy_from_sockptr(gf32, optval, optlen)) 257 goto out_free_p; 258 259 /* numsrc >= (4G-140)/128 overflow in 32 bits */ 260 ret = -ENOBUFS; 261 n = gf32->gf_numsrc; 262 if (n >= 0x1ffffffU || n > sysctl_mld_max_msf) 263 goto out_free_p; 264 265 ret = -EINVAL; 266 if (offsetof(struct compat_group_filter, gf_slist_flex[n]) > optlen) 267 goto out_free_p; 268 269 ret = ip6_mc_msfilter(sk, &(struct group_filter){ 270 .gf_interface = gf32->gf_interface, 271 .gf_group = gf32->gf_group, 272 .gf_fmode = gf32->gf_fmode, 273 .gf_numsrc = gf32->gf_numsrc}, gf32->gf_slist_flex); 274 275 out_free_p: 276 kfree(p); 277 return ret; 278 } 279 280 static int ipv6_mcast_join_leave(struct sock *sk, int optname, 281 sockptr_t optval, int optlen) 282 { 283 struct sockaddr_in6 *psin6; 284 struct group_req greq; 285 286 if (optlen < sizeof(greq)) 287 return -EINVAL; 288 if (copy_from_sockptr(&greq, optval, sizeof(greq))) 289 return -EFAULT; 290 291 if (greq.gr_group.ss_family != AF_INET6) 292 return -EADDRNOTAVAIL; 293 psin6 = (struct sockaddr_in6 *)&greq.gr_group; 294 if (optname == MCAST_JOIN_GROUP) 295 return ipv6_sock_mc_join(sk, greq.gr_interface, 296 &psin6->sin6_addr); 297 return ipv6_sock_mc_drop(sk, greq.gr_interface, &psin6->sin6_addr); 298 } 299 300 static int compat_ipv6_mcast_join_leave(struct sock *sk, int optname, 301 sockptr_t optval, int optlen) 302 { 303 struct compat_group_req gr32; 304 struct sockaddr_in6 *psin6; 305 306 if (optlen < sizeof(gr32)) 307 return -EINVAL; 308 if (copy_from_sockptr(&gr32, optval, sizeof(gr32))) 309 return -EFAULT; 310 311 if (gr32.gr_group.ss_family != AF_INET6) 312 return -EADDRNOTAVAIL; 313 psin6 = (struct sockaddr_in6 *)&gr32.gr_group; 314 if (optname == MCAST_JOIN_GROUP) 315 return ipv6_sock_mc_join(sk, gr32.gr_interface, 316 &psin6->sin6_addr); 317 return ipv6_sock_mc_drop(sk, gr32.gr_interface, &psin6->sin6_addr); 318 } 319 320 static int ipv6_set_opt_hdr(struct sock *sk, int optname, sockptr_t optval, 321 int optlen) 322 { 323 struct ipv6_pinfo *np = inet6_sk(sk); 324 struct ipv6_opt_hdr *new = NULL; 325 struct net *net = sock_net(sk); 326 struct ipv6_txoptions *opt; 327 int err; 328 329 /* hop-by-hop / destination options are privileged option */ 330 if (optname != IPV6_RTHDR && !sockopt_ns_capable(net->user_ns, CAP_NET_RAW)) 331 return -EPERM; 332 333 /* remove any sticky options header with a zero option 334 * length, per RFC3542. 335 */ 336 if (optlen > 0) { 337 if (sockptr_is_null(optval)) 338 return -EINVAL; 339 if (optlen < sizeof(struct ipv6_opt_hdr) || 340 optlen & 0x7 || 341 optlen > 8 * 255) 342 return -EINVAL; 343 344 new = memdup_sockptr(optval, optlen); 345 if (IS_ERR(new)) 346 return PTR_ERR(new); 347 if (unlikely(ipv6_optlen(new) > optlen)) { 348 kfree(new); 349 return -EINVAL; 350 } 351 } 352 353 opt = rcu_dereference_protected(np->opt, lockdep_sock_is_held(sk)); 354 opt = ipv6_renew_options(sk, opt, optname, new); 355 kfree(new); 356 if (IS_ERR(opt)) 357 return PTR_ERR(opt); 358 359 /* routing header option needs extra check */ 360 err = -EINVAL; 361 if (optname == IPV6_RTHDR && opt && opt->srcrt) { 362 struct ipv6_rt_hdr *rthdr = opt->srcrt; 363 switch (rthdr->type) { 364 #if IS_ENABLED(CONFIG_IPV6_MIP6) 365 case IPV6_SRCRT_TYPE_2: 366 if (rthdr->hdrlen != 2 || rthdr->segments_left != 1) 367 goto sticky_done; 368 break; 369 #endif 370 case IPV6_SRCRT_TYPE_4: 371 { 372 struct ipv6_sr_hdr *srh = 373 (struct ipv6_sr_hdr *)opt->srcrt; 374 375 if (!seg6_validate_srh(srh, optlen, false)) 376 goto sticky_done; 377 break; 378 } 379 default: 380 goto sticky_done; 381 } 382 } 383 384 err = 0; 385 opt = ipv6_update_options(sk, opt); 386 sticky_done: 387 if (opt) { 388 atomic_sub(opt->tot_len, &sk->sk_omem_alloc); 389 txopt_put(opt); 390 } 391 return err; 392 } 393 394 int do_ipv6_setsockopt(struct sock *sk, int level, int optname, 395 sockptr_t optval, unsigned int optlen) 396 { 397 struct ipv6_pinfo *np = inet6_sk(sk); 398 struct net *net = sock_net(sk); 399 int val, valbool; 400 int retv = -ENOPROTOOPT; 401 bool needs_rtnl = setsockopt_needs_rtnl(optname); 402 403 if (sockptr_is_null(optval)) 404 val = 0; 405 else { 406 if (optlen >= sizeof(int)) { 407 if (copy_from_sockptr(&val, optval, sizeof(val))) 408 return -EFAULT; 409 } else 410 val = 0; 411 } 412 413 valbool = (val != 0); 414 415 if (ip6_mroute_opt(optname)) 416 return ip6_mroute_setsockopt(sk, optname, optval, optlen); 417 418 /* Handle options that can be set without locking the socket. */ 419 switch (optname) { 420 case IPV6_UNICAST_HOPS: 421 if (optlen < sizeof(int)) 422 return -EINVAL; 423 if (val > 255 || val < -1) 424 return -EINVAL; 425 WRITE_ONCE(np->hop_limit, val); 426 return 0; 427 case IPV6_MULTICAST_LOOP: 428 if (optlen < sizeof(int)) 429 return -EINVAL; 430 if (val != valbool) 431 return -EINVAL; 432 inet6_assign_bit(MC6_LOOP, sk, valbool); 433 return 0; 434 case IPV6_MULTICAST_HOPS: 435 if (sk->sk_type == SOCK_STREAM) 436 return retv; 437 if (optlen < sizeof(int)) 438 return -EINVAL; 439 if (val > 255 || val < -1) 440 return -EINVAL; 441 WRITE_ONCE(np->mcast_hops, 442 val == -1 ? IPV6_DEFAULT_MCASTHOPS : val); 443 return 0; 444 case IPV6_MTU: 445 if (optlen < sizeof(int)) 446 return -EINVAL; 447 if (val && val < IPV6_MIN_MTU) 448 return -EINVAL; 449 WRITE_ONCE(np->frag_size, val); 450 return 0; 451 case IPV6_MINHOPCOUNT: 452 if (optlen < sizeof(int)) 453 return -EINVAL; 454 if (val < 0 || val > 255) 455 return -EINVAL; 456 457 if (val) 458 static_branch_enable(&ip6_min_hopcount); 459 460 /* tcp_v6_err() and tcp_v6_rcv() might read min_hopcount 461 * while we are changing it. 462 */ 463 WRITE_ONCE(np->min_hopcount, val); 464 return 0; 465 case IPV6_RECVERR_RFC4884: 466 if (optlen < sizeof(int)) 467 return -EINVAL; 468 if (val < 0 || val > 1) 469 return -EINVAL; 470 inet6_assign_bit(RECVERR6_RFC4884, sk, valbool); 471 return 0; 472 case IPV6_MULTICAST_ALL: 473 if (optlen < sizeof(int)) 474 return -EINVAL; 475 inet6_assign_bit(MC6_ALL, sk, valbool); 476 return 0; 477 case IPV6_AUTOFLOWLABEL: 478 inet6_assign_bit(AUTOFLOWLABEL, sk, valbool); 479 inet6_set_bit(AUTOFLOWLABEL_SET, sk); 480 return 0; 481 case IPV6_DONTFRAG: 482 inet6_assign_bit(DONTFRAG, sk, valbool); 483 return 0; 484 case IPV6_RECVERR: 485 if (optlen < sizeof(int)) 486 return -EINVAL; 487 inet6_assign_bit(RECVERR6, sk, valbool); 488 if (!val) 489 skb_errqueue_purge(&sk->sk_error_queue); 490 return 0; 491 case IPV6_ROUTER_ALERT_ISOLATE: 492 if (optlen < sizeof(int)) 493 return -EINVAL; 494 inet6_assign_bit(RTALERT_ISOLATE, sk, valbool); 495 return 0; 496 case IPV6_MTU_DISCOVER: 497 if (optlen < sizeof(int)) 498 return -EINVAL; 499 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT) 500 return -EINVAL; 501 WRITE_ONCE(np->pmtudisc, val); 502 return 0; 503 case IPV6_FLOWINFO_SEND: 504 if (optlen < sizeof(int)) 505 return -EINVAL; 506 inet6_assign_bit(SNDFLOW, sk, valbool); 507 return 0; 508 } 509 if (needs_rtnl) 510 rtnl_lock(); 511 sockopt_lock_sock(sk); 512 513 /* Another thread has converted the socket into IPv4 with 514 * IPV6_ADDRFORM concurrently. 515 */ 516 if (unlikely(sk->sk_family != AF_INET6)) 517 goto unlock; 518 519 switch (optname) { 520 521 case IPV6_ADDRFORM: 522 if (optlen < sizeof(int)) 523 goto e_inval; 524 if (val == PF_INET) { 525 if (sk->sk_type == SOCK_RAW) 526 break; 527 528 if (sk->sk_protocol == IPPROTO_UDP || 529 sk->sk_protocol == IPPROTO_UDPLITE) { 530 struct udp_sock *up = udp_sk(sk); 531 if (up->pending == AF_INET6) { 532 retv = -EBUSY; 533 break; 534 } 535 } else if (sk->sk_protocol == IPPROTO_TCP) { 536 if (sk->sk_prot != &tcpv6_prot) { 537 retv = -EBUSY; 538 break; 539 } 540 } else { 541 break; 542 } 543 544 if (sk->sk_state != TCP_ESTABLISHED) { 545 retv = -ENOTCONN; 546 break; 547 } 548 549 if (ipv6_only_sock(sk) || 550 !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) { 551 retv = -EADDRNOTAVAIL; 552 break; 553 } 554 555 __ipv6_sock_mc_close(sk); 556 __ipv6_sock_ac_close(sk); 557 558 if (sk->sk_protocol == IPPROTO_TCP) { 559 struct inet_connection_sock *icsk = inet_csk(sk); 560 561 sock_prot_inuse_add(net, sk->sk_prot, -1); 562 sock_prot_inuse_add(net, &tcp_prot, 1); 563 564 /* Paired with READ_ONCE(sk->sk_prot) in inet6_stream_ops */ 565 WRITE_ONCE(sk->sk_prot, &tcp_prot); 566 /* Paired with READ_ONCE() in tcp_(get|set)sockopt() */ 567 WRITE_ONCE(icsk->icsk_af_ops, &ipv4_specific); 568 WRITE_ONCE(sk->sk_socket->ops, &inet_stream_ops); 569 WRITE_ONCE(sk->sk_family, PF_INET); 570 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie); 571 } else { 572 struct proto *prot = &udp_prot; 573 574 if (sk->sk_protocol == IPPROTO_UDPLITE) 575 prot = &udplite_prot; 576 577 sock_prot_inuse_add(net, sk->sk_prot, -1); 578 sock_prot_inuse_add(net, prot, 1); 579 580 /* Paired with READ_ONCE(sk->sk_prot) in inet6_dgram_ops */ 581 WRITE_ONCE(sk->sk_prot, prot); 582 WRITE_ONCE(sk->sk_socket->ops, &inet_dgram_ops); 583 WRITE_ONCE(sk->sk_family, PF_INET); 584 } 585 586 /* Disable all options not to allocate memory anymore, 587 * but there is still a race. See the lockless path 588 * in udpv6_sendmsg() and ipv6_local_rxpmtu(). 589 */ 590 np->rxopt.all = 0; 591 592 inet6_cleanup_sock(sk); 593 594 module_put(THIS_MODULE); 595 retv = 0; 596 break; 597 } 598 goto e_inval; 599 600 case IPV6_V6ONLY: 601 if (optlen < sizeof(int) || 602 inet_sk(sk)->inet_num) 603 goto e_inval; 604 sk->sk_ipv6only = valbool; 605 retv = 0; 606 break; 607 608 case IPV6_RECVPKTINFO: 609 if (optlen < sizeof(int)) 610 goto e_inval; 611 np->rxopt.bits.rxinfo = valbool; 612 retv = 0; 613 break; 614 615 case IPV6_2292PKTINFO: 616 if (optlen < sizeof(int)) 617 goto e_inval; 618 np->rxopt.bits.rxoinfo = valbool; 619 retv = 0; 620 break; 621 622 case IPV6_RECVHOPLIMIT: 623 if (optlen < sizeof(int)) 624 goto e_inval; 625 np->rxopt.bits.rxhlim = valbool; 626 retv = 0; 627 break; 628 629 case IPV6_2292HOPLIMIT: 630 if (optlen < sizeof(int)) 631 goto e_inval; 632 np->rxopt.bits.rxohlim = valbool; 633 retv = 0; 634 break; 635 636 case IPV6_RECVRTHDR: 637 if (optlen < sizeof(int)) 638 goto e_inval; 639 np->rxopt.bits.srcrt = valbool; 640 retv = 0; 641 break; 642 643 case IPV6_2292RTHDR: 644 if (optlen < sizeof(int)) 645 goto e_inval; 646 np->rxopt.bits.osrcrt = valbool; 647 retv = 0; 648 break; 649 650 case IPV6_RECVHOPOPTS: 651 if (optlen < sizeof(int)) 652 goto e_inval; 653 np->rxopt.bits.hopopts = valbool; 654 retv = 0; 655 break; 656 657 case IPV6_2292HOPOPTS: 658 if (optlen < sizeof(int)) 659 goto e_inval; 660 np->rxopt.bits.ohopopts = valbool; 661 retv = 0; 662 break; 663 664 case IPV6_RECVDSTOPTS: 665 if (optlen < sizeof(int)) 666 goto e_inval; 667 np->rxopt.bits.dstopts = valbool; 668 retv = 0; 669 break; 670 671 case IPV6_2292DSTOPTS: 672 if (optlen < sizeof(int)) 673 goto e_inval; 674 np->rxopt.bits.odstopts = valbool; 675 retv = 0; 676 break; 677 678 case IPV6_TCLASS: 679 if (optlen < sizeof(int)) 680 goto e_inval; 681 if (val < -1 || val > 0xff) 682 goto e_inval; 683 /* RFC 3542, 6.5: default traffic class of 0x0 */ 684 if (val == -1) 685 val = 0; 686 if (sk->sk_type == SOCK_STREAM) { 687 val &= ~INET_ECN_MASK; 688 val |= np->tclass & INET_ECN_MASK; 689 } 690 if (np->tclass != val) { 691 np->tclass = val; 692 sk_dst_reset(sk); 693 } 694 retv = 0; 695 break; 696 697 case IPV6_RECVTCLASS: 698 if (optlen < sizeof(int)) 699 goto e_inval; 700 np->rxopt.bits.rxtclass = valbool; 701 retv = 0; 702 break; 703 704 case IPV6_FLOWINFO: 705 if (optlen < sizeof(int)) 706 goto e_inval; 707 np->rxopt.bits.rxflow = valbool; 708 retv = 0; 709 break; 710 711 case IPV6_RECVPATHMTU: 712 if (optlen < sizeof(int)) 713 goto e_inval; 714 np->rxopt.bits.rxpmtu = valbool; 715 retv = 0; 716 break; 717 718 case IPV6_TRANSPARENT: 719 if (valbool && !sockopt_ns_capable(net->user_ns, CAP_NET_RAW) && 720 !sockopt_ns_capable(net->user_ns, CAP_NET_ADMIN)) { 721 retv = -EPERM; 722 break; 723 } 724 if (optlen < sizeof(int)) 725 goto e_inval; 726 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */ 727 inet_assign_bit(TRANSPARENT, sk, valbool); 728 retv = 0; 729 break; 730 731 case IPV6_FREEBIND: 732 if (optlen < sizeof(int)) 733 goto e_inval; 734 /* we also don't have a separate freebind bit for IPV6 */ 735 inet_assign_bit(FREEBIND, sk, valbool); 736 retv = 0; 737 break; 738 739 case IPV6_RECVORIGDSTADDR: 740 if (optlen < sizeof(int)) 741 goto e_inval; 742 np->rxopt.bits.rxorigdstaddr = valbool; 743 retv = 0; 744 break; 745 746 case IPV6_HOPOPTS: 747 case IPV6_RTHDRDSTOPTS: 748 case IPV6_RTHDR: 749 case IPV6_DSTOPTS: 750 retv = ipv6_set_opt_hdr(sk, optname, optval, optlen); 751 break; 752 753 case IPV6_PKTINFO: 754 { 755 struct in6_pktinfo pkt; 756 757 if (optlen == 0) 758 goto e_inval; 759 else if (optlen < sizeof(struct in6_pktinfo) || 760 sockptr_is_null(optval)) 761 goto e_inval; 762 763 if (copy_from_sockptr(&pkt, optval, sizeof(pkt))) { 764 retv = -EFAULT; 765 break; 766 } 767 if (!sk_dev_equal_l3scope(sk, pkt.ipi6_ifindex)) 768 goto e_inval; 769 770 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex; 771 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr; 772 retv = 0; 773 break; 774 } 775 776 case IPV6_2292PKTOPTIONS: 777 { 778 struct ipv6_txoptions *opt = NULL; 779 struct msghdr msg; 780 struct flowi6 fl6; 781 struct ipcm6_cookie ipc6; 782 783 memset(&fl6, 0, sizeof(fl6)); 784 fl6.flowi6_oif = sk->sk_bound_dev_if; 785 fl6.flowi6_mark = sk->sk_mark; 786 787 if (optlen == 0) 788 goto update; 789 790 /* 1K is probably excessive 791 * 1K is surely not enough, 2K per standard header is 16K. 792 */ 793 retv = -EINVAL; 794 if (optlen > 64*1024) 795 break; 796 797 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL); 798 retv = -ENOBUFS; 799 if (!opt) 800 break; 801 802 memset(opt, 0, sizeof(*opt)); 803 refcount_set(&opt->refcnt, 1); 804 opt->tot_len = sizeof(*opt) + optlen; 805 retv = -EFAULT; 806 if (copy_from_sockptr(opt + 1, optval, optlen)) 807 goto done; 808 809 msg.msg_controllen = optlen; 810 msg.msg_control_is_user = false; 811 msg.msg_control = (void *)(opt+1); 812 ipc6.opt = opt; 813 814 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6); 815 if (retv) 816 goto done; 817 update: 818 retv = 0; 819 opt = ipv6_update_options(sk, opt); 820 done: 821 if (opt) { 822 atomic_sub(opt->tot_len, &sk->sk_omem_alloc); 823 txopt_put(opt); 824 } 825 break; 826 } 827 828 829 case IPV6_UNICAST_IF: 830 { 831 struct net_device *dev = NULL; 832 int ifindex; 833 834 if (optlen != sizeof(int)) 835 goto e_inval; 836 837 ifindex = (__force int)ntohl((__force __be32)val); 838 if (ifindex == 0) { 839 np->ucast_oif = 0; 840 retv = 0; 841 break; 842 } 843 844 dev = dev_get_by_index(net, ifindex); 845 retv = -EADDRNOTAVAIL; 846 if (!dev) 847 break; 848 dev_put(dev); 849 850 retv = -EINVAL; 851 if (sk->sk_bound_dev_if) 852 break; 853 854 np->ucast_oif = ifindex; 855 retv = 0; 856 break; 857 } 858 859 case IPV6_MULTICAST_IF: 860 if (sk->sk_type == SOCK_STREAM) 861 break; 862 if (optlen < sizeof(int)) 863 goto e_inval; 864 865 if (val) { 866 struct net_device *dev; 867 int midx; 868 869 rcu_read_lock(); 870 871 dev = dev_get_by_index_rcu(net, val); 872 if (!dev) { 873 rcu_read_unlock(); 874 retv = -ENODEV; 875 break; 876 } 877 midx = l3mdev_master_ifindex_rcu(dev); 878 879 rcu_read_unlock(); 880 881 if (sk->sk_bound_dev_if && 882 sk->sk_bound_dev_if != val && 883 (!midx || midx != sk->sk_bound_dev_if)) 884 goto e_inval; 885 } 886 np->mcast_oif = val; 887 retv = 0; 888 break; 889 case IPV6_ADD_MEMBERSHIP: 890 case IPV6_DROP_MEMBERSHIP: 891 { 892 struct ipv6_mreq mreq; 893 894 if (optlen < sizeof(struct ipv6_mreq)) 895 goto e_inval; 896 897 retv = -EPROTO; 898 if (inet_test_bit(IS_ICSK, sk)) 899 break; 900 901 retv = -EFAULT; 902 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq))) 903 break; 904 905 if (optname == IPV6_ADD_MEMBERSHIP) 906 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr); 907 else 908 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr); 909 break; 910 } 911 case IPV6_JOIN_ANYCAST: 912 case IPV6_LEAVE_ANYCAST: 913 { 914 struct ipv6_mreq mreq; 915 916 if (optlen < sizeof(struct ipv6_mreq)) 917 goto e_inval; 918 919 retv = -EFAULT; 920 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq))) 921 break; 922 923 if (optname == IPV6_JOIN_ANYCAST) 924 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr); 925 else 926 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr); 927 break; 928 } 929 case MCAST_JOIN_GROUP: 930 case MCAST_LEAVE_GROUP: 931 if (in_compat_syscall()) 932 retv = compat_ipv6_mcast_join_leave(sk, optname, optval, 933 optlen); 934 else 935 retv = ipv6_mcast_join_leave(sk, optname, optval, 936 optlen); 937 break; 938 case MCAST_JOIN_SOURCE_GROUP: 939 case MCAST_LEAVE_SOURCE_GROUP: 940 case MCAST_BLOCK_SOURCE: 941 case MCAST_UNBLOCK_SOURCE: 942 retv = do_ipv6_mcast_group_source(sk, optname, optval, optlen); 943 break; 944 case MCAST_MSFILTER: 945 if (in_compat_syscall()) 946 retv = compat_ipv6_set_mcast_msfilter(sk, optval, 947 optlen); 948 else 949 retv = ipv6_set_mcast_msfilter(sk, optval, optlen); 950 break; 951 case IPV6_ROUTER_ALERT: 952 if (optlen < sizeof(int)) 953 goto e_inval; 954 retv = ip6_ra_control(sk, val); 955 break; 956 case IPV6_FLOWLABEL_MGR: 957 retv = ipv6_flowlabel_opt(sk, optval, optlen); 958 break; 959 case IPV6_IPSEC_POLICY: 960 case IPV6_XFRM_POLICY: 961 retv = -EPERM; 962 if (!sockopt_ns_capable(net->user_ns, CAP_NET_ADMIN)) 963 break; 964 retv = xfrm_user_policy(sk, optname, optval, optlen); 965 break; 966 967 case IPV6_ADDR_PREFERENCES: 968 if (optlen < sizeof(int)) 969 goto e_inval; 970 retv = __ip6_sock_set_addr_preferences(sk, val); 971 break; 972 case IPV6_RECVFRAGSIZE: 973 np->rxopt.bits.recvfragsize = valbool; 974 retv = 0; 975 break; 976 } 977 978 unlock: 979 sockopt_release_sock(sk); 980 if (needs_rtnl) 981 rtnl_unlock(); 982 983 return retv; 984 985 e_inval: 986 retv = -EINVAL; 987 goto unlock; 988 } 989 990 int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, 991 unsigned int optlen) 992 { 993 int err; 994 995 if (level == SOL_IP && sk->sk_type != SOCK_RAW) 996 return udp_prot.setsockopt(sk, level, optname, optval, optlen); 997 998 if (level != SOL_IPV6) 999 return -ENOPROTOOPT; 1000 1001 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen); 1002 #ifdef CONFIG_NETFILTER 1003 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1004 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY && 1005 optname != IPV6_XFRM_POLICY) 1006 err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen); 1007 #endif 1008 return err; 1009 } 1010 EXPORT_SYMBOL(ipv6_setsockopt); 1011 1012 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt, 1013 int optname, sockptr_t optval, int len) 1014 { 1015 struct ipv6_opt_hdr *hdr; 1016 1017 if (!opt) 1018 return 0; 1019 1020 switch (optname) { 1021 case IPV6_HOPOPTS: 1022 hdr = opt->hopopt; 1023 break; 1024 case IPV6_RTHDRDSTOPTS: 1025 hdr = opt->dst0opt; 1026 break; 1027 case IPV6_RTHDR: 1028 hdr = (struct ipv6_opt_hdr *)opt->srcrt; 1029 break; 1030 case IPV6_DSTOPTS: 1031 hdr = opt->dst1opt; 1032 break; 1033 default: 1034 return -EINVAL; /* should not happen */ 1035 } 1036 1037 if (!hdr) 1038 return 0; 1039 1040 len = min_t(unsigned int, len, ipv6_optlen(hdr)); 1041 if (copy_to_sockptr(optval, hdr, len)) 1042 return -EFAULT; 1043 return len; 1044 } 1045 1046 static int ipv6_get_msfilter(struct sock *sk, sockptr_t optval, 1047 sockptr_t optlen, int len) 1048 { 1049 const int size0 = offsetof(struct group_filter, gf_slist_flex); 1050 struct group_filter gsf; 1051 int num; 1052 int err; 1053 1054 if (len < size0) 1055 return -EINVAL; 1056 if (copy_from_sockptr(&gsf, optval, size0)) 1057 return -EFAULT; 1058 if (gsf.gf_group.ss_family != AF_INET6) 1059 return -EADDRNOTAVAIL; 1060 num = gsf.gf_numsrc; 1061 sockopt_lock_sock(sk); 1062 err = ip6_mc_msfget(sk, &gsf, optval, size0); 1063 if (!err) { 1064 if (num > gsf.gf_numsrc) 1065 num = gsf.gf_numsrc; 1066 len = GROUP_FILTER_SIZE(num); 1067 if (copy_to_sockptr(optlen, &len, sizeof(int)) || 1068 copy_to_sockptr(optval, &gsf, size0)) 1069 err = -EFAULT; 1070 } 1071 sockopt_release_sock(sk); 1072 return err; 1073 } 1074 1075 static int compat_ipv6_get_msfilter(struct sock *sk, sockptr_t optval, 1076 sockptr_t optlen, int len) 1077 { 1078 const int size0 = offsetof(struct compat_group_filter, gf_slist_flex); 1079 struct compat_group_filter gf32; 1080 struct group_filter gf; 1081 int err; 1082 int num; 1083 1084 if (len < size0) 1085 return -EINVAL; 1086 1087 if (copy_from_sockptr(&gf32, optval, size0)) 1088 return -EFAULT; 1089 gf.gf_interface = gf32.gf_interface; 1090 gf.gf_fmode = gf32.gf_fmode; 1091 num = gf.gf_numsrc = gf32.gf_numsrc; 1092 gf.gf_group = gf32.gf_group; 1093 1094 if (gf.gf_group.ss_family != AF_INET6) 1095 return -EADDRNOTAVAIL; 1096 1097 sockopt_lock_sock(sk); 1098 err = ip6_mc_msfget(sk, &gf, optval, size0); 1099 sockopt_release_sock(sk); 1100 if (err) 1101 return err; 1102 if (num > gf.gf_numsrc) 1103 num = gf.gf_numsrc; 1104 len = GROUP_FILTER_SIZE(num) - (sizeof(gf)-sizeof(gf32)); 1105 if (copy_to_sockptr(optlen, &len, sizeof(int)) || 1106 copy_to_sockptr_offset(optval, offsetof(struct compat_group_filter, gf_fmode), 1107 &gf.gf_fmode, sizeof(gf32.gf_fmode)) || 1108 copy_to_sockptr_offset(optval, offsetof(struct compat_group_filter, gf_numsrc), 1109 &gf.gf_numsrc, sizeof(gf32.gf_numsrc))) 1110 return -EFAULT; 1111 return 0; 1112 } 1113 1114 int do_ipv6_getsockopt(struct sock *sk, int level, int optname, 1115 sockptr_t optval, sockptr_t optlen) 1116 { 1117 struct ipv6_pinfo *np = inet6_sk(sk); 1118 int len; 1119 int val; 1120 1121 if (ip6_mroute_opt(optname)) 1122 return ip6_mroute_getsockopt(sk, optname, optval, optlen); 1123 1124 if (copy_from_sockptr(&len, optlen, sizeof(int))) 1125 return -EFAULT; 1126 switch (optname) { 1127 case IPV6_ADDRFORM: 1128 if (sk->sk_protocol != IPPROTO_UDP && 1129 sk->sk_protocol != IPPROTO_UDPLITE && 1130 sk->sk_protocol != IPPROTO_TCP) 1131 return -ENOPROTOOPT; 1132 if (sk->sk_state != TCP_ESTABLISHED) 1133 return -ENOTCONN; 1134 val = sk->sk_family; 1135 break; 1136 case MCAST_MSFILTER: 1137 if (in_compat_syscall()) 1138 return compat_ipv6_get_msfilter(sk, optval, optlen, len); 1139 return ipv6_get_msfilter(sk, optval, optlen, len); 1140 case IPV6_2292PKTOPTIONS: 1141 { 1142 struct msghdr msg; 1143 struct sk_buff *skb; 1144 1145 if (sk->sk_type != SOCK_STREAM) 1146 return -ENOPROTOOPT; 1147 1148 if (optval.is_kernel) { 1149 msg.msg_control_is_user = false; 1150 msg.msg_control = optval.kernel; 1151 } else { 1152 msg.msg_control_is_user = true; 1153 msg.msg_control_user = optval.user; 1154 } 1155 msg.msg_controllen = len; 1156 msg.msg_flags = 0; 1157 1158 sockopt_lock_sock(sk); 1159 skb = np->pktoptions; 1160 if (skb) 1161 ip6_datagram_recv_ctl(sk, &msg, skb); 1162 sockopt_release_sock(sk); 1163 if (!skb) { 1164 if (np->rxopt.bits.rxinfo) { 1165 struct in6_pktinfo src_info; 1166 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif : 1167 np->sticky_pktinfo.ipi6_ifindex; 1168 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr; 1169 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info); 1170 } 1171 if (np->rxopt.bits.rxhlim) { 1172 int hlim = READ_ONCE(np->mcast_hops); 1173 1174 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); 1175 } 1176 if (np->rxopt.bits.rxtclass) { 1177 int tclass = (int)ip6_tclass(np->rcv_flowinfo); 1178 1179 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass); 1180 } 1181 if (np->rxopt.bits.rxoinfo) { 1182 struct in6_pktinfo src_info; 1183 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif : 1184 np->sticky_pktinfo.ipi6_ifindex; 1185 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : 1186 np->sticky_pktinfo.ipi6_addr; 1187 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); 1188 } 1189 if (np->rxopt.bits.rxohlim) { 1190 int hlim = READ_ONCE(np->mcast_hops); 1191 1192 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); 1193 } 1194 if (np->rxopt.bits.rxflow) { 1195 __be32 flowinfo = np->rcv_flowinfo; 1196 1197 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo); 1198 } 1199 } 1200 len -= msg.msg_controllen; 1201 return copy_to_sockptr(optlen, &len, sizeof(int)); 1202 } 1203 case IPV6_MTU: 1204 { 1205 struct dst_entry *dst; 1206 1207 val = 0; 1208 rcu_read_lock(); 1209 dst = __sk_dst_get(sk); 1210 if (dst) 1211 val = dst_mtu(dst); 1212 rcu_read_unlock(); 1213 if (!val) 1214 return -ENOTCONN; 1215 break; 1216 } 1217 1218 case IPV6_V6ONLY: 1219 val = sk->sk_ipv6only; 1220 break; 1221 1222 case IPV6_RECVPKTINFO: 1223 val = np->rxopt.bits.rxinfo; 1224 break; 1225 1226 case IPV6_2292PKTINFO: 1227 val = np->rxopt.bits.rxoinfo; 1228 break; 1229 1230 case IPV6_RECVHOPLIMIT: 1231 val = np->rxopt.bits.rxhlim; 1232 break; 1233 1234 case IPV6_2292HOPLIMIT: 1235 val = np->rxopt.bits.rxohlim; 1236 break; 1237 1238 case IPV6_RECVRTHDR: 1239 val = np->rxopt.bits.srcrt; 1240 break; 1241 1242 case IPV6_2292RTHDR: 1243 val = np->rxopt.bits.osrcrt; 1244 break; 1245 1246 case IPV6_HOPOPTS: 1247 case IPV6_RTHDRDSTOPTS: 1248 case IPV6_RTHDR: 1249 case IPV6_DSTOPTS: 1250 { 1251 struct ipv6_txoptions *opt; 1252 1253 sockopt_lock_sock(sk); 1254 opt = rcu_dereference_protected(np->opt, 1255 lockdep_sock_is_held(sk)); 1256 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len); 1257 sockopt_release_sock(sk); 1258 /* check if ipv6_getsockopt_sticky() returns err code */ 1259 if (len < 0) 1260 return len; 1261 return copy_to_sockptr(optlen, &len, sizeof(int)); 1262 } 1263 1264 case IPV6_RECVHOPOPTS: 1265 val = np->rxopt.bits.hopopts; 1266 break; 1267 1268 case IPV6_2292HOPOPTS: 1269 val = np->rxopt.bits.ohopopts; 1270 break; 1271 1272 case IPV6_RECVDSTOPTS: 1273 val = np->rxopt.bits.dstopts; 1274 break; 1275 1276 case IPV6_2292DSTOPTS: 1277 val = np->rxopt.bits.odstopts; 1278 break; 1279 1280 case IPV6_TCLASS: 1281 val = np->tclass; 1282 break; 1283 1284 case IPV6_RECVTCLASS: 1285 val = np->rxopt.bits.rxtclass; 1286 break; 1287 1288 case IPV6_FLOWINFO: 1289 val = np->rxopt.bits.rxflow; 1290 break; 1291 1292 case IPV6_RECVPATHMTU: 1293 val = np->rxopt.bits.rxpmtu; 1294 break; 1295 1296 case IPV6_PATHMTU: 1297 { 1298 struct dst_entry *dst; 1299 struct ip6_mtuinfo mtuinfo; 1300 1301 if (len < sizeof(mtuinfo)) 1302 return -EINVAL; 1303 1304 len = sizeof(mtuinfo); 1305 memset(&mtuinfo, 0, sizeof(mtuinfo)); 1306 1307 rcu_read_lock(); 1308 dst = __sk_dst_get(sk); 1309 if (dst) 1310 mtuinfo.ip6m_mtu = dst_mtu(dst); 1311 rcu_read_unlock(); 1312 if (!mtuinfo.ip6m_mtu) 1313 return -ENOTCONN; 1314 1315 if (copy_to_sockptr(optlen, &len, sizeof(int))) 1316 return -EFAULT; 1317 if (copy_to_sockptr(optval, &mtuinfo, len)) 1318 return -EFAULT; 1319 1320 return 0; 1321 } 1322 1323 case IPV6_TRANSPARENT: 1324 val = inet_test_bit(TRANSPARENT, sk); 1325 break; 1326 1327 case IPV6_FREEBIND: 1328 val = inet_test_bit(FREEBIND, sk); 1329 break; 1330 1331 case IPV6_RECVORIGDSTADDR: 1332 val = np->rxopt.bits.rxorigdstaddr; 1333 break; 1334 1335 case IPV6_UNICAST_HOPS: 1336 case IPV6_MULTICAST_HOPS: 1337 { 1338 struct dst_entry *dst; 1339 1340 if (optname == IPV6_UNICAST_HOPS) 1341 val = READ_ONCE(np->hop_limit); 1342 else 1343 val = READ_ONCE(np->mcast_hops); 1344 1345 if (val < 0) { 1346 rcu_read_lock(); 1347 dst = __sk_dst_get(sk); 1348 if (dst) 1349 val = ip6_dst_hoplimit(dst); 1350 rcu_read_unlock(); 1351 } 1352 1353 if (val < 0) 1354 val = sock_net(sk)->ipv6.devconf_all->hop_limit; 1355 break; 1356 } 1357 1358 case IPV6_MULTICAST_LOOP: 1359 val = inet6_test_bit(MC6_LOOP, sk); 1360 break; 1361 1362 case IPV6_MULTICAST_IF: 1363 val = np->mcast_oif; 1364 break; 1365 1366 case IPV6_MULTICAST_ALL: 1367 val = inet6_test_bit(MC6_ALL, sk); 1368 break; 1369 1370 case IPV6_UNICAST_IF: 1371 val = (__force int)htonl((__u32) np->ucast_oif); 1372 break; 1373 1374 case IPV6_MTU_DISCOVER: 1375 val = READ_ONCE(np->pmtudisc); 1376 break; 1377 1378 case IPV6_RECVERR: 1379 val = inet6_test_bit(RECVERR6, sk); 1380 break; 1381 1382 case IPV6_FLOWINFO_SEND: 1383 val = inet6_test_bit(SNDFLOW, sk); 1384 break; 1385 1386 case IPV6_FLOWLABEL_MGR: 1387 { 1388 struct in6_flowlabel_req freq; 1389 int flags; 1390 1391 if (len < sizeof(freq)) 1392 return -EINVAL; 1393 1394 if (copy_from_sockptr(&freq, optval, sizeof(freq))) 1395 return -EFAULT; 1396 1397 if (freq.flr_action != IPV6_FL_A_GET) 1398 return -EINVAL; 1399 1400 len = sizeof(freq); 1401 flags = freq.flr_flags; 1402 1403 memset(&freq, 0, sizeof(freq)); 1404 1405 val = ipv6_flowlabel_opt_get(sk, &freq, flags); 1406 if (val < 0) 1407 return val; 1408 1409 if (copy_to_sockptr(optlen, &len, sizeof(int))) 1410 return -EFAULT; 1411 if (copy_to_sockptr(optval, &freq, len)) 1412 return -EFAULT; 1413 1414 return 0; 1415 } 1416 1417 case IPV6_ADDR_PREFERENCES: 1418 val = 0; 1419 1420 if (np->srcprefs & IPV6_PREFER_SRC_TMP) 1421 val |= IPV6_PREFER_SRC_TMP; 1422 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC) 1423 val |= IPV6_PREFER_SRC_PUBLIC; 1424 else { 1425 /* XXX: should we return system default? */ 1426 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT; 1427 } 1428 1429 if (np->srcprefs & IPV6_PREFER_SRC_COA) 1430 val |= IPV6_PREFER_SRC_COA; 1431 else 1432 val |= IPV6_PREFER_SRC_HOME; 1433 break; 1434 1435 case IPV6_MINHOPCOUNT: 1436 val = READ_ONCE(np->min_hopcount); 1437 break; 1438 1439 case IPV6_DONTFRAG: 1440 val = inet6_test_bit(DONTFRAG, sk); 1441 break; 1442 1443 case IPV6_AUTOFLOWLABEL: 1444 val = ip6_autoflowlabel(sock_net(sk), sk); 1445 break; 1446 1447 case IPV6_RECVFRAGSIZE: 1448 val = np->rxopt.bits.recvfragsize; 1449 break; 1450 1451 case IPV6_ROUTER_ALERT_ISOLATE: 1452 val = inet6_test_bit(RTALERT_ISOLATE, sk); 1453 break; 1454 1455 case IPV6_RECVERR_RFC4884: 1456 val = inet6_test_bit(RECVERR6_RFC4884, sk); 1457 break; 1458 1459 default: 1460 return -ENOPROTOOPT; 1461 } 1462 len = min_t(unsigned int, sizeof(int), len); 1463 if (copy_to_sockptr(optlen, &len, sizeof(int))) 1464 return -EFAULT; 1465 if (copy_to_sockptr(optval, &val, len)) 1466 return -EFAULT; 1467 return 0; 1468 } 1469 1470 int ipv6_getsockopt(struct sock *sk, int level, int optname, 1471 char __user *optval, int __user *optlen) 1472 { 1473 int err; 1474 1475 if (level == SOL_IP && sk->sk_type != SOCK_RAW) 1476 return udp_prot.getsockopt(sk, level, optname, optval, optlen); 1477 1478 if (level != SOL_IPV6) 1479 return -ENOPROTOOPT; 1480 1481 err = do_ipv6_getsockopt(sk, level, optname, 1482 USER_SOCKPTR(optval), USER_SOCKPTR(optlen)); 1483 #ifdef CONFIG_NETFILTER 1484 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1485 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) { 1486 int len; 1487 1488 if (get_user(len, optlen)) 1489 return -EFAULT; 1490 1491 err = nf_getsockopt(sk, PF_INET6, optname, optval, &len); 1492 if (err >= 0) 1493 err = put_user(len, optlen); 1494 } 1495 #endif 1496 return err; 1497 } 1498 EXPORT_SYMBOL(ipv6_getsockopt); 1499