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 #include <net/psp.h> 53 54 #include <linux/uaccess.h> 55 56 struct ip6_ra_chain *ip6_ra_chain; 57 DEFINE_RWLOCK(ip6_ra_lock); 58 59 DEFINE_STATIC_KEY_FALSE(ip6_min_hopcount); 60 61 int ip6_ra_control(struct sock *sk, int sel) 62 { 63 struct ip6_ra_chain *ra, *new_ra, **rap; 64 65 /* RA packet may be delivered ONLY to IPPROTO_RAW socket */ 66 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num != IPPROTO_RAW) 67 return -ENOPROTOOPT; 68 69 new_ra = (sel >= 0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL; 70 if (sel >= 0 && !new_ra) 71 return -ENOMEM; 72 73 write_lock_bh(&ip6_ra_lock); 74 for (rap = &ip6_ra_chain; (ra = *rap) != NULL; rap = &ra->next) { 75 if (ra->sk == sk) { 76 if (sel >= 0) { 77 write_unlock_bh(&ip6_ra_lock); 78 kfree(new_ra); 79 return -EADDRINUSE; 80 } 81 82 *rap = ra->next; 83 write_unlock_bh(&ip6_ra_lock); 84 85 sock_put(sk); 86 kfree(ra); 87 return 0; 88 } 89 } 90 if (!new_ra) { 91 write_unlock_bh(&ip6_ra_lock); 92 return -ENOBUFS; 93 } 94 new_ra->sk = sk; 95 new_ra->sel = sel; 96 new_ra->next = ra; 97 *rap = new_ra; 98 sock_hold(sk); 99 write_unlock_bh(&ip6_ra_lock); 100 return 0; 101 } 102 103 struct ipv6_txoptions *ipv6_update_options(struct sock *sk, 104 struct ipv6_txoptions *opt) 105 { 106 if (inet_test_bit(IS_ICSK, sk)) { 107 if (opt && 108 !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) && 109 inet_sk(sk)->inet_daddr != LOOPBACK4_IPV6) { 110 struct inet_connection_sock *icsk = inet_csk(sk); 111 112 icsk->icsk_ext_hdr_len = 113 psp_sk_overhead(sk) + 114 opt->opt_flen + opt->opt_nflen; 115 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie); 116 } 117 } 118 opt = unrcu_pointer(xchg(&inet6_sk(sk)->opt, RCU_INITIALIZER(opt))); 119 sk_dst_reset(sk); 120 121 return opt; 122 } 123 124 static int copy_group_source_from_sockptr(struct group_source_req *greqs, 125 sockptr_t optval, int optlen) 126 { 127 if (in_compat_syscall()) { 128 struct compat_group_source_req gr32; 129 130 if (optlen < sizeof(gr32)) 131 return -EINVAL; 132 if (copy_from_sockptr(&gr32, optval, sizeof(gr32))) 133 return -EFAULT; 134 greqs->gsr_interface = gr32.gsr_interface; 135 greqs->gsr_group = gr32.gsr_group; 136 greqs->gsr_source = gr32.gsr_source; 137 } else { 138 if (optlen < sizeof(*greqs)) 139 return -EINVAL; 140 if (copy_from_sockptr(greqs, optval, sizeof(*greqs))) 141 return -EFAULT; 142 } 143 144 return 0; 145 } 146 147 static int do_ipv6_mcast_group_source(struct sock *sk, int optname, 148 sockptr_t optval, int optlen) 149 { 150 struct group_source_req greqs; 151 int omode, add; 152 int ret; 153 154 ret = copy_group_source_from_sockptr(&greqs, optval, optlen); 155 if (ret) 156 return ret; 157 158 if (greqs.gsr_group.ss_family != AF_INET6 || 159 greqs.gsr_source.ss_family != AF_INET6) 160 return -EADDRNOTAVAIL; 161 162 if (optname == MCAST_BLOCK_SOURCE) { 163 omode = MCAST_EXCLUDE; 164 add = 1; 165 } else if (optname == MCAST_UNBLOCK_SOURCE) { 166 omode = MCAST_EXCLUDE; 167 add = 0; 168 } else if (optname == MCAST_JOIN_SOURCE_GROUP) { 169 struct sockaddr_in6 *psin6; 170 int retv; 171 172 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group; 173 retv = ipv6_sock_mc_join_ssm(sk, greqs.gsr_interface, 174 &psin6->sin6_addr, 175 MCAST_INCLUDE); 176 /* prior join w/ different source is ok */ 177 if (retv && retv != -EADDRINUSE) 178 return retv; 179 omode = MCAST_INCLUDE; 180 add = 1; 181 } else /* MCAST_LEAVE_SOURCE_GROUP */ { 182 omode = MCAST_INCLUDE; 183 add = 0; 184 } 185 return ip6_mc_source(add, omode, sk, &greqs); 186 } 187 188 static int ipv6_set_mcast_msfilter(struct sock *sk, sockptr_t optval, 189 int optlen) 190 { 191 struct group_filter *gsf; 192 int ret; 193 194 if (optlen < GROUP_FILTER_SIZE(0)) 195 return -EINVAL; 196 if (optlen > READ_ONCE(sock_net(sk)->core.sysctl_optmem_max)) 197 return -ENOBUFS; 198 199 gsf = memdup_sockptr(optval, optlen); 200 if (IS_ERR(gsf)) 201 return PTR_ERR(gsf); 202 203 /* numsrc >= (4G-140)/128 overflow in 32 bits */ 204 ret = -ENOBUFS; 205 if (gsf->gf_numsrc >= 0x1ffffffU || 206 gsf->gf_numsrc > sysctl_mld_max_msf) 207 goto out_free_gsf; 208 209 ret = -EINVAL; 210 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) 211 goto out_free_gsf; 212 213 ret = ip6_mc_msfilter(sk, gsf, gsf->gf_slist_flex); 214 out_free_gsf: 215 kfree(gsf); 216 return ret; 217 } 218 219 static int compat_ipv6_set_mcast_msfilter(struct sock *sk, sockptr_t optval, 220 int optlen) 221 { 222 const int size0 = offsetof(struct compat_group_filter, gf_slist_flex); 223 struct compat_group_filter *gf32; 224 void *p; 225 int ret; 226 int n; 227 228 if (optlen < size0) 229 return -EINVAL; 230 if (optlen > READ_ONCE(sock_net(sk)->core.sysctl_optmem_max) - 4) 231 return -ENOBUFS; 232 233 p = kmalloc(optlen + 4, GFP_KERNEL); 234 if (!p) 235 return -ENOMEM; 236 237 gf32 = p + 4; /* we want ->gf_group and ->gf_slist_flex aligned */ 238 ret = -EFAULT; 239 if (copy_from_sockptr(gf32, optval, optlen)) 240 goto out_free_p; 241 242 /* numsrc >= (4G-140)/128 overflow in 32 bits */ 243 ret = -ENOBUFS; 244 n = gf32->gf_numsrc; 245 if (n >= 0x1ffffffU || n > sysctl_mld_max_msf) 246 goto out_free_p; 247 248 ret = -EINVAL; 249 if (offsetof(struct compat_group_filter, gf_slist_flex[n]) > optlen) 250 goto out_free_p; 251 252 ret = ip6_mc_msfilter(sk, &(struct group_filter){ 253 .gf_interface = gf32->gf_interface, 254 .gf_group = gf32->gf_group, 255 .gf_fmode = gf32->gf_fmode, 256 .gf_numsrc = gf32->gf_numsrc}, gf32->gf_slist_flex); 257 258 out_free_p: 259 kfree(p); 260 return ret; 261 } 262 263 static int ipv6_mcast_join_leave(struct sock *sk, int optname, 264 sockptr_t optval, int optlen) 265 { 266 struct sockaddr_in6 *psin6; 267 struct group_req greq; 268 269 if (optlen < sizeof(greq)) 270 return -EINVAL; 271 if (copy_from_sockptr(&greq, optval, sizeof(greq))) 272 return -EFAULT; 273 274 if (greq.gr_group.ss_family != AF_INET6) 275 return -EADDRNOTAVAIL; 276 psin6 = (struct sockaddr_in6 *)&greq.gr_group; 277 if (optname == MCAST_JOIN_GROUP) 278 return ipv6_sock_mc_join(sk, greq.gr_interface, 279 &psin6->sin6_addr); 280 return ipv6_sock_mc_drop(sk, greq.gr_interface, &psin6->sin6_addr); 281 } 282 283 static int compat_ipv6_mcast_join_leave(struct sock *sk, int optname, 284 sockptr_t optval, int optlen) 285 { 286 struct compat_group_req gr32; 287 struct sockaddr_in6 *psin6; 288 289 if (optlen < sizeof(gr32)) 290 return -EINVAL; 291 if (copy_from_sockptr(&gr32, optval, sizeof(gr32))) 292 return -EFAULT; 293 294 if (gr32.gr_group.ss_family != AF_INET6) 295 return -EADDRNOTAVAIL; 296 psin6 = (struct sockaddr_in6 *)&gr32.gr_group; 297 if (optname == MCAST_JOIN_GROUP) 298 return ipv6_sock_mc_join(sk, gr32.gr_interface, 299 &psin6->sin6_addr); 300 return ipv6_sock_mc_drop(sk, gr32.gr_interface, &psin6->sin6_addr); 301 } 302 303 static int ipv6_set_opt_hdr(struct sock *sk, int optname, sockptr_t optval, 304 int optlen) 305 { 306 struct ipv6_pinfo *np = inet6_sk(sk); 307 struct ipv6_opt_hdr *new = NULL; 308 struct net *net = sock_net(sk); 309 struct ipv6_txoptions *opt; 310 int err; 311 312 /* hop-by-hop / destination options are privileged option */ 313 if (optname != IPV6_RTHDR && !sockopt_ns_capable(net->user_ns, CAP_NET_RAW)) 314 return -EPERM; 315 316 /* remove any sticky options header with a zero option 317 * length, per RFC3542. 318 */ 319 if (optlen > 0) { 320 if (sockptr_is_null(optval)) 321 return -EINVAL; 322 if (optlen < sizeof(struct ipv6_opt_hdr) || 323 optlen & 0x7 || 324 optlen > 8 * 255) 325 return -EINVAL; 326 327 new = memdup_sockptr(optval, optlen); 328 if (IS_ERR(new)) 329 return PTR_ERR(new); 330 if (unlikely(ipv6_optlen(new) > optlen)) { 331 kfree(new); 332 return -EINVAL; 333 } 334 } 335 336 opt = rcu_dereference_protected(np->opt, lockdep_sock_is_held(sk)); 337 opt = ipv6_renew_options(sk, opt, optname, new); 338 kfree(new); 339 if (IS_ERR(opt)) 340 return PTR_ERR(opt); 341 342 /* routing header option needs extra check */ 343 err = -EINVAL; 344 if (optname == IPV6_RTHDR && opt && opt->srcrt) { 345 struct ipv6_rt_hdr *rthdr = opt->srcrt; 346 switch (rthdr->type) { 347 #if IS_ENABLED(CONFIG_IPV6_MIP6) 348 case IPV6_SRCRT_TYPE_2: 349 if (rthdr->hdrlen != 2 || rthdr->segments_left != 1) 350 goto sticky_done; 351 break; 352 #endif 353 case IPV6_SRCRT_TYPE_4: 354 { 355 struct ipv6_sr_hdr *srh = 356 (struct ipv6_sr_hdr *)opt->srcrt; 357 358 if (!seg6_validate_srh(srh, optlen, false)) 359 goto sticky_done; 360 break; 361 } 362 default: 363 goto sticky_done; 364 } 365 } 366 367 err = 0; 368 opt = ipv6_update_options(sk, opt); 369 sticky_done: 370 if (opt) { 371 atomic_sub(opt->tot_len, &sk->sk_omem_alloc); 372 txopt_put(opt); 373 } 374 return err; 375 } 376 377 int do_ipv6_setsockopt(struct sock *sk, int level, int optname, 378 sockptr_t optval, unsigned int optlen) 379 { 380 struct ipv6_pinfo *np = inet6_sk(sk); 381 struct net *net = sock_net(sk); 382 int retv = -ENOPROTOOPT; 383 int val, valbool; 384 385 if (sockptr_is_null(optval)) 386 val = 0; 387 else { 388 if (optlen >= sizeof(int)) { 389 if (copy_from_sockptr(&val, optval, sizeof(val))) 390 return -EFAULT; 391 } else 392 val = 0; 393 } 394 395 valbool = (val != 0); 396 397 if (ip6_mroute_opt(optname)) 398 return ip6_mroute_setsockopt(sk, optname, optval, optlen); 399 400 /* Handle options that can be set without locking the socket. */ 401 switch (optname) { 402 case IPV6_UNICAST_HOPS: 403 if (optlen < sizeof(int)) 404 return -EINVAL; 405 if (val > 255 || val < -1) 406 return -EINVAL; 407 WRITE_ONCE(np->hop_limit, val); 408 return 0; 409 case IPV6_MULTICAST_LOOP: 410 if (optlen < sizeof(int)) 411 return -EINVAL; 412 if (val != valbool) 413 return -EINVAL; 414 inet6_assign_bit(MC6_LOOP, sk, valbool); 415 return 0; 416 case IPV6_MULTICAST_HOPS: 417 if (sk->sk_type == SOCK_STREAM) 418 return retv; 419 if (optlen < sizeof(int)) 420 return -EINVAL; 421 if (val > 255 || val < -1) 422 return -EINVAL; 423 WRITE_ONCE(np->mcast_hops, 424 val == -1 ? IPV6_DEFAULT_MCASTHOPS : val); 425 return 0; 426 case IPV6_MTU: 427 if (optlen < sizeof(int)) 428 return -EINVAL; 429 if (val && val < IPV6_MIN_MTU) 430 return -EINVAL; 431 WRITE_ONCE(np->frag_size, val); 432 return 0; 433 case IPV6_MINHOPCOUNT: 434 if (optlen < sizeof(int)) 435 return -EINVAL; 436 if (val < 0 || val > 255) 437 return -EINVAL; 438 439 if (val) 440 static_branch_enable(&ip6_min_hopcount); 441 442 /* tcp_v6_err() and tcp_v6_rcv() might read min_hopcount 443 * while we are changing it. 444 */ 445 WRITE_ONCE(np->min_hopcount, val); 446 return 0; 447 case IPV6_RECVERR_RFC4884: 448 if (optlen < sizeof(int)) 449 return -EINVAL; 450 if (val < 0 || val > 1) 451 return -EINVAL; 452 inet6_assign_bit(RECVERR6_RFC4884, sk, valbool); 453 return 0; 454 case IPV6_MULTICAST_ALL: 455 if (optlen < sizeof(int)) 456 return -EINVAL; 457 inet6_assign_bit(MC6_ALL, sk, valbool); 458 return 0; 459 case IPV6_AUTOFLOWLABEL: 460 inet6_assign_bit(AUTOFLOWLABEL, sk, valbool); 461 inet6_set_bit(AUTOFLOWLABEL_SET, sk); 462 return 0; 463 case IPV6_DONTFRAG: 464 inet6_assign_bit(DONTFRAG, sk, valbool); 465 return 0; 466 case IPV6_RECVERR: 467 if (optlen < sizeof(int)) 468 return -EINVAL; 469 inet6_assign_bit(RECVERR6, sk, valbool); 470 if (!val) 471 skb_errqueue_purge(&sk->sk_error_queue); 472 return 0; 473 case IPV6_ROUTER_ALERT_ISOLATE: 474 if (optlen < sizeof(int)) 475 return -EINVAL; 476 inet6_assign_bit(RTALERT_ISOLATE, sk, valbool); 477 return 0; 478 case IPV6_MTU_DISCOVER: 479 if (optlen < sizeof(int)) 480 return -EINVAL; 481 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT) 482 return -EINVAL; 483 WRITE_ONCE(np->pmtudisc, val); 484 return 0; 485 case IPV6_FLOWINFO_SEND: 486 if (optlen < sizeof(int)) 487 return -EINVAL; 488 inet6_assign_bit(SNDFLOW, sk, valbool); 489 return 0; 490 case IPV6_ADDR_PREFERENCES: 491 if (optlen < sizeof(int)) 492 return -EINVAL; 493 return ip6_sock_set_addr_preferences(sk, val); 494 case IPV6_MULTICAST_IF: 495 if (sk->sk_type == SOCK_STREAM) 496 return -ENOPROTOOPT; 497 if (optlen < sizeof(int)) 498 return -EINVAL; 499 if (val) { 500 struct net_device *dev; 501 int bound_dev_if, midx; 502 503 rcu_read_lock(); 504 505 dev = dev_get_by_index_rcu(net, val); 506 if (!dev) { 507 rcu_read_unlock(); 508 return -ENODEV; 509 } 510 midx = l3mdev_master_ifindex_rcu(dev); 511 512 rcu_read_unlock(); 513 514 bound_dev_if = READ_ONCE(sk->sk_bound_dev_if); 515 if (bound_dev_if && 516 bound_dev_if != val && 517 (!midx || midx != bound_dev_if)) 518 return -EINVAL; 519 } 520 WRITE_ONCE(np->mcast_oif, val); 521 return 0; 522 case IPV6_UNICAST_IF: 523 { 524 struct net_device *dev; 525 int ifindex; 526 527 if (optlen != sizeof(int)) 528 return -EINVAL; 529 530 ifindex = (__force int)ntohl((__force __be32)val); 531 if (!ifindex) { 532 WRITE_ONCE(np->ucast_oif, 0); 533 return 0; 534 } 535 536 dev = dev_get_by_index(net, ifindex); 537 if (!dev) 538 return -EADDRNOTAVAIL; 539 dev_put(dev); 540 541 if (READ_ONCE(sk->sk_bound_dev_if)) 542 return -EINVAL; 543 544 WRITE_ONCE(np->ucast_oif, ifindex); 545 return 0; 546 } 547 } 548 549 sockopt_lock_sock(sk); 550 551 /* Another thread has converted the socket into IPv4 with 552 * IPV6_ADDRFORM concurrently. 553 */ 554 if (unlikely(sk->sk_family != AF_INET6)) 555 goto unlock; 556 557 switch (optname) { 558 559 case IPV6_ADDRFORM: 560 if (optlen < sizeof(int)) 561 goto e_inval; 562 if (val == PF_INET) { 563 if (sk->sk_type == SOCK_RAW) 564 break; 565 566 if (sk->sk_protocol == IPPROTO_UDP || 567 sk->sk_protocol == IPPROTO_UDPLITE) { 568 struct udp_sock *up = udp_sk(sk); 569 if (up->pending == AF_INET6) { 570 retv = -EBUSY; 571 break; 572 } 573 } else if (sk->sk_protocol == IPPROTO_TCP) { 574 if (sk->sk_prot != &tcpv6_prot) { 575 retv = -EBUSY; 576 break; 577 } 578 } else { 579 break; 580 } 581 582 if (sk->sk_state != TCP_ESTABLISHED) { 583 retv = -ENOTCONN; 584 break; 585 } 586 587 if (ipv6_only_sock(sk) || 588 !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) { 589 retv = -EADDRNOTAVAIL; 590 break; 591 } 592 593 __ipv6_sock_mc_close(sk); 594 __ipv6_sock_ac_close(sk); 595 596 if (sk->sk_protocol == IPPROTO_TCP) { 597 struct inet_connection_sock *icsk = inet_csk(sk); 598 599 sock_prot_inuse_add(net, sk->sk_prot, -1); 600 sock_prot_inuse_add(net, &tcp_prot, 1); 601 602 /* Paired with READ_ONCE(sk->sk_prot) in inet6_stream_ops */ 603 WRITE_ONCE(sk->sk_prot, &tcp_prot); 604 /* Paired with READ_ONCE() in tcp_(get|set)sockopt() */ 605 WRITE_ONCE(icsk->icsk_af_ops, &ipv4_specific); 606 WRITE_ONCE(sk->sk_socket->ops, &inet_stream_ops); 607 WRITE_ONCE(sk->sk_family, PF_INET); 608 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie); 609 } else { 610 struct proto *prot = &udp_prot; 611 612 if (sk->sk_protocol == IPPROTO_UDPLITE) 613 prot = &udplite_prot; 614 615 sock_prot_inuse_add(net, sk->sk_prot, -1); 616 sock_prot_inuse_add(net, prot, 1); 617 618 /* Paired with READ_ONCE(sk->sk_prot) in inet6_dgram_ops */ 619 WRITE_ONCE(sk->sk_prot, prot); 620 WRITE_ONCE(sk->sk_socket->ops, &inet_dgram_ops); 621 WRITE_ONCE(sk->sk_family, PF_INET); 622 } 623 624 /* Disable all options not to allocate memory anymore, 625 * but there is still a race. See the lockless path 626 * in udpv6_sendmsg() and ipv6_local_rxpmtu(). 627 */ 628 np->rxopt.all = 0; 629 630 inet6_cleanup_sock(sk); 631 632 module_put(THIS_MODULE); 633 retv = 0; 634 break; 635 } 636 goto e_inval; 637 638 case IPV6_V6ONLY: 639 if (optlen < sizeof(int) || 640 inet_sk(sk)->inet_num) 641 goto e_inval; 642 sk->sk_ipv6only = valbool; 643 retv = 0; 644 break; 645 646 case IPV6_RECVPKTINFO: 647 if (optlen < sizeof(int)) 648 goto e_inval; 649 np->rxopt.bits.rxinfo = valbool; 650 retv = 0; 651 break; 652 653 case IPV6_2292PKTINFO: 654 if (optlen < sizeof(int)) 655 goto e_inval; 656 np->rxopt.bits.rxoinfo = valbool; 657 retv = 0; 658 break; 659 660 case IPV6_RECVHOPLIMIT: 661 if (optlen < sizeof(int)) 662 goto e_inval; 663 np->rxopt.bits.rxhlim = valbool; 664 retv = 0; 665 break; 666 667 case IPV6_2292HOPLIMIT: 668 if (optlen < sizeof(int)) 669 goto e_inval; 670 np->rxopt.bits.rxohlim = valbool; 671 retv = 0; 672 break; 673 674 case IPV6_RECVRTHDR: 675 if (optlen < sizeof(int)) 676 goto e_inval; 677 np->rxopt.bits.srcrt = valbool; 678 retv = 0; 679 break; 680 681 case IPV6_2292RTHDR: 682 if (optlen < sizeof(int)) 683 goto e_inval; 684 np->rxopt.bits.osrcrt = valbool; 685 retv = 0; 686 break; 687 688 case IPV6_RECVHOPOPTS: 689 if (optlen < sizeof(int)) 690 goto e_inval; 691 np->rxopt.bits.hopopts = valbool; 692 retv = 0; 693 break; 694 695 case IPV6_2292HOPOPTS: 696 if (optlen < sizeof(int)) 697 goto e_inval; 698 np->rxopt.bits.ohopopts = valbool; 699 retv = 0; 700 break; 701 702 case IPV6_RECVDSTOPTS: 703 if (optlen < sizeof(int)) 704 goto e_inval; 705 np->rxopt.bits.dstopts = valbool; 706 retv = 0; 707 break; 708 709 case IPV6_2292DSTOPTS: 710 if (optlen < sizeof(int)) 711 goto e_inval; 712 np->rxopt.bits.odstopts = valbool; 713 retv = 0; 714 break; 715 716 case IPV6_TCLASS: 717 if (optlen < sizeof(int)) 718 goto e_inval; 719 if (val < -1 || val > 0xff) 720 goto e_inval; 721 /* RFC 3542, 6.5: default traffic class of 0x0 */ 722 if (val == -1) 723 val = 0; 724 if (sk->sk_type == SOCK_STREAM) { 725 val &= ~INET_ECN_MASK; 726 val |= np->tclass & INET_ECN_MASK; 727 } 728 if (np->tclass != val) { 729 np->tclass = val; 730 sk_dst_reset(sk); 731 } 732 retv = 0; 733 break; 734 735 case IPV6_RECVTCLASS: 736 if (optlen < sizeof(int)) 737 goto e_inval; 738 np->rxopt.bits.rxtclass = valbool; 739 retv = 0; 740 break; 741 742 case IPV6_FLOWINFO: 743 if (optlen < sizeof(int)) 744 goto e_inval; 745 np->rxopt.bits.rxflow = valbool; 746 retv = 0; 747 break; 748 749 case IPV6_RECVPATHMTU: 750 if (optlen < sizeof(int)) 751 goto e_inval; 752 np->rxopt.bits.rxpmtu = valbool; 753 retv = 0; 754 break; 755 756 case IPV6_TRANSPARENT: 757 if (valbool && !sockopt_ns_capable(net->user_ns, CAP_NET_RAW) && 758 !sockopt_ns_capable(net->user_ns, CAP_NET_ADMIN)) { 759 retv = -EPERM; 760 break; 761 } 762 if (optlen < sizeof(int)) 763 goto e_inval; 764 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */ 765 inet_assign_bit(TRANSPARENT, sk, valbool); 766 retv = 0; 767 break; 768 769 case IPV6_FREEBIND: 770 if (optlen < sizeof(int)) 771 goto e_inval; 772 /* we also don't have a separate freebind bit for IPV6 */ 773 inet_assign_bit(FREEBIND, sk, valbool); 774 retv = 0; 775 break; 776 777 case IPV6_RECVORIGDSTADDR: 778 if (optlen < sizeof(int)) 779 goto e_inval; 780 np->rxopt.bits.rxorigdstaddr = valbool; 781 retv = 0; 782 break; 783 784 case IPV6_HOPOPTS: 785 case IPV6_RTHDRDSTOPTS: 786 case IPV6_RTHDR: 787 case IPV6_DSTOPTS: 788 retv = ipv6_set_opt_hdr(sk, optname, optval, optlen); 789 break; 790 791 case IPV6_PKTINFO: 792 { 793 struct in6_pktinfo pkt; 794 795 if (optlen == 0) 796 goto e_inval; 797 else if (optlen < sizeof(struct in6_pktinfo) || 798 sockptr_is_null(optval)) 799 goto e_inval; 800 801 if (copy_from_sockptr(&pkt, optval, sizeof(pkt))) { 802 retv = -EFAULT; 803 break; 804 } 805 if (!sk_dev_equal_l3scope(sk, pkt.ipi6_ifindex)) 806 goto e_inval; 807 808 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex; 809 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr; 810 retv = 0; 811 break; 812 } 813 814 case IPV6_2292PKTOPTIONS: 815 { 816 struct ipv6_txoptions *opt = NULL; 817 struct msghdr msg; 818 struct flowi6 fl6; 819 struct ipcm6_cookie ipc6; 820 821 memset(&fl6, 0, sizeof(fl6)); 822 fl6.flowi6_oif = sk->sk_bound_dev_if; 823 fl6.flowi6_mark = sk->sk_mark; 824 825 if (optlen == 0) 826 goto update; 827 828 /* 1K is probably excessive 829 * 1K is surely not enough, 2K per standard header is 16K. 830 */ 831 retv = -EINVAL; 832 if (optlen > 64*1024) 833 break; 834 835 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL); 836 retv = -ENOBUFS; 837 if (!opt) 838 break; 839 840 memset(opt, 0, sizeof(*opt)); 841 refcount_set(&opt->refcnt, 1); 842 opt->tot_len = sizeof(*opt) + optlen; 843 retv = -EFAULT; 844 if (copy_from_sockptr(opt + 1, optval, optlen)) 845 goto done; 846 847 msg.msg_controllen = optlen; 848 msg.msg_control_is_user = false; 849 msg.msg_control = (void *)(opt+1); 850 ipc6.opt = opt; 851 852 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6); 853 if (retv) 854 goto done; 855 update: 856 retv = 0; 857 opt = ipv6_update_options(sk, opt); 858 done: 859 if (opt) { 860 atomic_sub(opt->tot_len, &sk->sk_omem_alloc); 861 txopt_put(opt); 862 } 863 break; 864 } 865 866 case IPV6_ADD_MEMBERSHIP: 867 case IPV6_DROP_MEMBERSHIP: 868 { 869 struct ipv6_mreq mreq; 870 871 if (optlen < sizeof(struct ipv6_mreq)) 872 goto e_inval; 873 874 retv = -EPROTO; 875 if (inet_test_bit(IS_ICSK, sk)) 876 break; 877 878 retv = -EFAULT; 879 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq))) 880 break; 881 882 if (optname == IPV6_ADD_MEMBERSHIP) 883 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr); 884 else 885 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr); 886 break; 887 } 888 case IPV6_JOIN_ANYCAST: 889 case IPV6_LEAVE_ANYCAST: 890 { 891 struct ipv6_mreq mreq; 892 893 if (optlen < sizeof(struct ipv6_mreq)) 894 goto e_inval; 895 896 retv = -EFAULT; 897 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq))) 898 break; 899 900 if (optname == IPV6_JOIN_ANYCAST) 901 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr); 902 else 903 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr); 904 break; 905 } 906 case MCAST_JOIN_GROUP: 907 case MCAST_LEAVE_GROUP: 908 if (in_compat_syscall()) 909 retv = compat_ipv6_mcast_join_leave(sk, optname, optval, 910 optlen); 911 else 912 retv = ipv6_mcast_join_leave(sk, optname, optval, 913 optlen); 914 break; 915 case MCAST_JOIN_SOURCE_GROUP: 916 case MCAST_LEAVE_SOURCE_GROUP: 917 case MCAST_BLOCK_SOURCE: 918 case MCAST_UNBLOCK_SOURCE: 919 retv = do_ipv6_mcast_group_source(sk, optname, optval, optlen); 920 break; 921 case MCAST_MSFILTER: 922 if (in_compat_syscall()) 923 retv = compat_ipv6_set_mcast_msfilter(sk, optval, 924 optlen); 925 else 926 retv = ipv6_set_mcast_msfilter(sk, optval, optlen); 927 break; 928 case IPV6_ROUTER_ALERT: 929 if (optlen < sizeof(int)) 930 goto e_inval; 931 retv = ip6_ra_control(sk, val); 932 if (retv == 0) 933 inet6_assign_bit(RTALERT, sk, valbool); 934 break; 935 case IPV6_FLOWLABEL_MGR: 936 retv = ipv6_flowlabel_opt(sk, optval, optlen); 937 break; 938 case IPV6_IPSEC_POLICY: 939 case IPV6_XFRM_POLICY: 940 retv = -EPERM; 941 if (!sockopt_ns_capable(net->user_ns, CAP_NET_ADMIN)) 942 break; 943 retv = xfrm_user_policy(sk, optname, optval, optlen); 944 break; 945 946 case IPV6_RECVFRAGSIZE: 947 np->rxopt.bits.recvfragsize = valbool; 948 retv = 0; 949 break; 950 } 951 952 unlock: 953 sockopt_release_sock(sk); 954 955 return retv; 956 957 e_inval: 958 retv = -EINVAL; 959 goto unlock; 960 } 961 962 int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, 963 unsigned int optlen) 964 { 965 int err; 966 967 if (level == SOL_IP && sk->sk_type != SOCK_RAW) 968 return ip_setsockopt(sk, level, optname, optval, optlen); 969 970 if (level != SOL_IPV6) 971 return -ENOPROTOOPT; 972 973 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen); 974 #ifdef CONFIG_NETFILTER 975 /* we need to exclude all possible ENOPROTOOPTs except default case */ 976 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY && 977 optname != IPV6_XFRM_POLICY) 978 err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen); 979 #endif 980 return err; 981 } 982 EXPORT_SYMBOL(ipv6_setsockopt); 983 984 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt, 985 int optname, sockptr_t optval, int len) 986 { 987 struct ipv6_opt_hdr *hdr; 988 989 if (!opt) 990 return 0; 991 992 switch (optname) { 993 case IPV6_HOPOPTS: 994 hdr = opt->hopopt; 995 break; 996 case IPV6_RTHDRDSTOPTS: 997 hdr = opt->dst0opt; 998 break; 999 case IPV6_RTHDR: 1000 hdr = (struct ipv6_opt_hdr *)opt->srcrt; 1001 break; 1002 case IPV6_DSTOPTS: 1003 hdr = opt->dst1opt; 1004 break; 1005 default: 1006 return -EINVAL; /* should not happen */ 1007 } 1008 1009 if (!hdr) 1010 return 0; 1011 1012 len = min_t(unsigned int, len, ipv6_optlen(hdr)); 1013 if (copy_to_sockptr(optval, hdr, len)) 1014 return -EFAULT; 1015 return len; 1016 } 1017 1018 static int ipv6_get_msfilter(struct sock *sk, sockptr_t optval, 1019 sockptr_t optlen, int len) 1020 { 1021 const int size0 = offsetof(struct group_filter, gf_slist_flex); 1022 struct group_filter gsf; 1023 int num; 1024 int err; 1025 1026 if (len < size0) 1027 return -EINVAL; 1028 if (copy_from_sockptr(&gsf, optval, size0)) 1029 return -EFAULT; 1030 if (gsf.gf_group.ss_family != AF_INET6) 1031 return -EADDRNOTAVAIL; 1032 num = gsf.gf_numsrc; 1033 sockopt_lock_sock(sk); 1034 err = ip6_mc_msfget(sk, &gsf, optval, size0); 1035 if (!err) { 1036 if (num > gsf.gf_numsrc) 1037 num = gsf.gf_numsrc; 1038 len = GROUP_FILTER_SIZE(num); 1039 if (copy_to_sockptr(optlen, &len, sizeof(int)) || 1040 copy_to_sockptr(optval, &gsf, size0)) 1041 err = -EFAULT; 1042 } 1043 sockopt_release_sock(sk); 1044 return err; 1045 } 1046 1047 static int compat_ipv6_get_msfilter(struct sock *sk, sockptr_t optval, 1048 sockptr_t optlen, int len) 1049 { 1050 const int size0 = offsetof(struct compat_group_filter, gf_slist_flex); 1051 struct compat_group_filter gf32; 1052 struct group_filter gf; 1053 int err; 1054 int num; 1055 1056 if (len < size0) 1057 return -EINVAL; 1058 1059 if (copy_from_sockptr(&gf32, optval, size0)) 1060 return -EFAULT; 1061 gf.gf_interface = gf32.gf_interface; 1062 gf.gf_fmode = gf32.gf_fmode; 1063 num = gf.gf_numsrc = gf32.gf_numsrc; 1064 gf.gf_group = gf32.gf_group; 1065 1066 if (gf.gf_group.ss_family != AF_INET6) 1067 return -EADDRNOTAVAIL; 1068 1069 sockopt_lock_sock(sk); 1070 err = ip6_mc_msfget(sk, &gf, optval, size0); 1071 sockopt_release_sock(sk); 1072 if (err) 1073 return err; 1074 if (num > gf.gf_numsrc) 1075 num = gf.gf_numsrc; 1076 len = GROUP_FILTER_SIZE(num) - (sizeof(gf)-sizeof(gf32)); 1077 if (copy_to_sockptr(optlen, &len, sizeof(int)) || 1078 copy_to_sockptr_offset(optval, offsetof(struct compat_group_filter, gf_fmode), 1079 &gf.gf_fmode, sizeof(gf32.gf_fmode)) || 1080 copy_to_sockptr_offset(optval, offsetof(struct compat_group_filter, gf_numsrc), 1081 &gf.gf_numsrc, sizeof(gf32.gf_numsrc))) 1082 return -EFAULT; 1083 return 0; 1084 } 1085 1086 int do_ipv6_getsockopt(struct sock *sk, int level, int optname, 1087 sockptr_t optval, sockptr_t optlen) 1088 { 1089 struct ipv6_pinfo *np = inet6_sk(sk); 1090 int len; 1091 int val; 1092 1093 if (ip6_mroute_opt(optname)) 1094 return ip6_mroute_getsockopt(sk, optname, optval, optlen); 1095 1096 if (copy_from_sockptr(&len, optlen, sizeof(int))) 1097 return -EFAULT; 1098 switch (optname) { 1099 case IPV6_ADDRFORM: 1100 if (sk->sk_protocol != IPPROTO_UDP && 1101 sk->sk_protocol != IPPROTO_UDPLITE && 1102 sk->sk_protocol != IPPROTO_TCP) 1103 return -ENOPROTOOPT; 1104 if (sk->sk_state != TCP_ESTABLISHED) 1105 return -ENOTCONN; 1106 val = sk->sk_family; 1107 break; 1108 case MCAST_MSFILTER: 1109 if (in_compat_syscall()) 1110 return compat_ipv6_get_msfilter(sk, optval, optlen, len); 1111 return ipv6_get_msfilter(sk, optval, optlen, len); 1112 case IPV6_2292PKTOPTIONS: 1113 { 1114 struct msghdr msg; 1115 struct sk_buff *skb; 1116 1117 if (sk->sk_type != SOCK_STREAM) 1118 return -ENOPROTOOPT; 1119 1120 if (optval.is_kernel) { 1121 msg.msg_control_is_user = false; 1122 msg.msg_control = optval.kernel; 1123 } else { 1124 msg.msg_control_is_user = true; 1125 msg.msg_control_user = optval.user; 1126 } 1127 msg.msg_controllen = len; 1128 msg.msg_flags = 0; 1129 1130 sockopt_lock_sock(sk); 1131 skb = np->pktoptions; 1132 if (skb) 1133 ip6_datagram_recv_ctl(sk, &msg, skb); 1134 sockopt_release_sock(sk); 1135 if (!skb) { 1136 if (np->rxopt.bits.rxinfo) { 1137 int mcast_oif = READ_ONCE(np->mcast_oif); 1138 struct in6_pktinfo src_info; 1139 1140 src_info.ipi6_ifindex = mcast_oif ? : 1141 np->sticky_pktinfo.ipi6_ifindex; 1142 src_info.ipi6_addr = mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr; 1143 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info); 1144 } 1145 if (np->rxopt.bits.rxhlim) { 1146 int hlim = READ_ONCE(np->mcast_hops); 1147 1148 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); 1149 } 1150 if (np->rxopt.bits.rxtclass) { 1151 int tclass = (int)ip6_tclass(np->rcv_flowinfo); 1152 1153 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass); 1154 } 1155 if (np->rxopt.bits.rxoinfo) { 1156 int mcast_oif = READ_ONCE(np->mcast_oif); 1157 struct in6_pktinfo src_info; 1158 1159 src_info.ipi6_ifindex = mcast_oif ? : 1160 np->sticky_pktinfo.ipi6_ifindex; 1161 src_info.ipi6_addr = mcast_oif ? sk->sk_v6_daddr : 1162 np->sticky_pktinfo.ipi6_addr; 1163 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); 1164 } 1165 if (np->rxopt.bits.rxohlim) { 1166 int hlim = READ_ONCE(np->mcast_hops); 1167 1168 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); 1169 } 1170 if (np->rxopt.bits.rxflow) { 1171 __be32 flowinfo = np->rcv_flowinfo; 1172 1173 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo); 1174 } 1175 } 1176 len -= msg.msg_controllen; 1177 return copy_to_sockptr(optlen, &len, sizeof(int)); 1178 } 1179 case IPV6_MTU: 1180 { 1181 struct dst_entry *dst; 1182 1183 val = 0; 1184 rcu_read_lock(); 1185 dst = __sk_dst_get(sk); 1186 if (dst) 1187 val = dst_mtu(dst); 1188 rcu_read_unlock(); 1189 if (!val) 1190 return -ENOTCONN; 1191 break; 1192 } 1193 1194 case IPV6_V6ONLY: 1195 val = sk->sk_ipv6only; 1196 break; 1197 1198 case IPV6_RECVPKTINFO: 1199 val = np->rxopt.bits.rxinfo; 1200 break; 1201 1202 case IPV6_2292PKTINFO: 1203 val = np->rxopt.bits.rxoinfo; 1204 break; 1205 1206 case IPV6_RECVHOPLIMIT: 1207 val = np->rxopt.bits.rxhlim; 1208 break; 1209 1210 case IPV6_2292HOPLIMIT: 1211 val = np->rxopt.bits.rxohlim; 1212 break; 1213 1214 case IPV6_RECVRTHDR: 1215 val = np->rxopt.bits.srcrt; 1216 break; 1217 1218 case IPV6_2292RTHDR: 1219 val = np->rxopt.bits.osrcrt; 1220 break; 1221 1222 case IPV6_HOPOPTS: 1223 case IPV6_RTHDRDSTOPTS: 1224 case IPV6_RTHDR: 1225 case IPV6_DSTOPTS: 1226 { 1227 struct ipv6_txoptions *opt; 1228 1229 sockopt_lock_sock(sk); 1230 opt = rcu_dereference_protected(np->opt, 1231 lockdep_sock_is_held(sk)); 1232 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len); 1233 sockopt_release_sock(sk); 1234 /* check if ipv6_getsockopt_sticky() returns err code */ 1235 if (len < 0) 1236 return len; 1237 return copy_to_sockptr(optlen, &len, sizeof(int)); 1238 } 1239 1240 case IPV6_RECVHOPOPTS: 1241 val = np->rxopt.bits.hopopts; 1242 break; 1243 1244 case IPV6_2292HOPOPTS: 1245 val = np->rxopt.bits.ohopopts; 1246 break; 1247 1248 case IPV6_RECVDSTOPTS: 1249 val = np->rxopt.bits.dstopts; 1250 break; 1251 1252 case IPV6_2292DSTOPTS: 1253 val = np->rxopt.bits.odstopts; 1254 break; 1255 1256 case IPV6_TCLASS: 1257 val = np->tclass; 1258 break; 1259 1260 case IPV6_RECVTCLASS: 1261 val = np->rxopt.bits.rxtclass; 1262 break; 1263 1264 case IPV6_FLOWINFO: 1265 val = np->rxopt.bits.rxflow; 1266 break; 1267 1268 case IPV6_RECVPATHMTU: 1269 val = np->rxopt.bits.rxpmtu; 1270 break; 1271 1272 case IPV6_PATHMTU: 1273 { 1274 struct dst_entry *dst; 1275 struct ip6_mtuinfo mtuinfo; 1276 1277 if (len < sizeof(mtuinfo)) 1278 return -EINVAL; 1279 1280 len = sizeof(mtuinfo); 1281 memset(&mtuinfo, 0, sizeof(mtuinfo)); 1282 1283 rcu_read_lock(); 1284 dst = __sk_dst_get(sk); 1285 if (dst) 1286 mtuinfo.ip6m_mtu = dst_mtu(dst); 1287 rcu_read_unlock(); 1288 if (!mtuinfo.ip6m_mtu) 1289 return -ENOTCONN; 1290 1291 if (copy_to_sockptr(optlen, &len, sizeof(int))) 1292 return -EFAULT; 1293 if (copy_to_sockptr(optval, &mtuinfo, len)) 1294 return -EFAULT; 1295 1296 return 0; 1297 } 1298 1299 case IPV6_TRANSPARENT: 1300 val = inet_test_bit(TRANSPARENT, sk); 1301 break; 1302 1303 case IPV6_FREEBIND: 1304 val = inet_test_bit(FREEBIND, sk); 1305 break; 1306 1307 case IPV6_RECVORIGDSTADDR: 1308 val = np->rxopt.bits.rxorigdstaddr; 1309 break; 1310 1311 case IPV6_UNICAST_HOPS: 1312 case IPV6_MULTICAST_HOPS: 1313 { 1314 struct dst_entry *dst; 1315 1316 if (optname == IPV6_UNICAST_HOPS) 1317 val = READ_ONCE(np->hop_limit); 1318 else 1319 val = READ_ONCE(np->mcast_hops); 1320 1321 if (val < 0) { 1322 rcu_read_lock(); 1323 dst = __sk_dst_get(sk); 1324 if (dst) 1325 val = ip6_dst_hoplimit(dst); 1326 rcu_read_unlock(); 1327 } 1328 1329 if (val < 0) 1330 val = READ_ONCE(sock_net(sk)->ipv6.devconf_all->hop_limit); 1331 break; 1332 } 1333 1334 case IPV6_MULTICAST_LOOP: 1335 val = inet6_test_bit(MC6_LOOP, sk); 1336 break; 1337 1338 case IPV6_MULTICAST_IF: 1339 val = READ_ONCE(np->mcast_oif); 1340 break; 1341 1342 case IPV6_MULTICAST_ALL: 1343 val = inet6_test_bit(MC6_ALL, sk); 1344 break; 1345 1346 case IPV6_UNICAST_IF: 1347 val = (__force int)htonl((__u32) READ_ONCE(np->ucast_oif)); 1348 break; 1349 1350 case IPV6_MTU_DISCOVER: 1351 val = READ_ONCE(np->pmtudisc); 1352 break; 1353 1354 case IPV6_RECVERR: 1355 val = inet6_test_bit(RECVERR6, sk); 1356 break; 1357 1358 case IPV6_FLOWINFO_SEND: 1359 val = inet6_test_bit(SNDFLOW, sk); 1360 break; 1361 1362 case IPV6_FLOWLABEL_MGR: 1363 { 1364 struct in6_flowlabel_req freq; 1365 int flags; 1366 1367 if (len < sizeof(freq)) 1368 return -EINVAL; 1369 1370 if (copy_from_sockptr(&freq, optval, sizeof(freq))) 1371 return -EFAULT; 1372 1373 if (freq.flr_action != IPV6_FL_A_GET) 1374 return -EINVAL; 1375 1376 len = sizeof(freq); 1377 flags = freq.flr_flags; 1378 1379 memset(&freq, 0, sizeof(freq)); 1380 1381 val = ipv6_flowlabel_opt_get(sk, &freq, flags); 1382 if (val < 0) 1383 return val; 1384 1385 if (copy_to_sockptr(optlen, &len, sizeof(int))) 1386 return -EFAULT; 1387 if (copy_to_sockptr(optval, &freq, len)) 1388 return -EFAULT; 1389 1390 return 0; 1391 } 1392 1393 case IPV6_ADDR_PREFERENCES: 1394 { 1395 u8 srcprefs = READ_ONCE(np->srcprefs); 1396 val = 0; 1397 1398 if (srcprefs & IPV6_PREFER_SRC_TMP) 1399 val |= IPV6_PREFER_SRC_TMP; 1400 else if (srcprefs & IPV6_PREFER_SRC_PUBLIC) 1401 val |= IPV6_PREFER_SRC_PUBLIC; 1402 else { 1403 /* XXX: should we return system default? */ 1404 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT; 1405 } 1406 1407 if (srcprefs & IPV6_PREFER_SRC_COA) 1408 val |= IPV6_PREFER_SRC_COA; 1409 else 1410 val |= IPV6_PREFER_SRC_HOME; 1411 break; 1412 } 1413 case IPV6_MINHOPCOUNT: 1414 val = READ_ONCE(np->min_hopcount); 1415 break; 1416 1417 case IPV6_DONTFRAG: 1418 val = inet6_test_bit(DONTFRAG, sk); 1419 break; 1420 1421 case IPV6_AUTOFLOWLABEL: 1422 val = ip6_autoflowlabel(sock_net(sk), sk); 1423 break; 1424 1425 case IPV6_RECVFRAGSIZE: 1426 val = np->rxopt.bits.recvfragsize; 1427 break; 1428 1429 case IPV6_ROUTER_ALERT: 1430 val = inet6_test_bit(RTALERT, sk); 1431 break; 1432 1433 case IPV6_ROUTER_ALERT_ISOLATE: 1434 val = inet6_test_bit(RTALERT_ISOLATE, sk); 1435 break; 1436 1437 case IPV6_RECVERR_RFC4884: 1438 val = inet6_test_bit(RECVERR6_RFC4884, sk); 1439 break; 1440 1441 default: 1442 return -ENOPROTOOPT; 1443 } 1444 len = min_t(unsigned int, sizeof(int), len); 1445 if (copy_to_sockptr(optlen, &len, sizeof(int))) 1446 return -EFAULT; 1447 if (copy_to_sockptr(optval, &val, len)) 1448 return -EFAULT; 1449 return 0; 1450 } 1451 1452 int ipv6_getsockopt(struct sock *sk, int level, int optname, 1453 char __user *optval, int __user *optlen) 1454 { 1455 int err; 1456 1457 if (level == SOL_IP && sk->sk_type != SOCK_RAW) 1458 return ip_getsockopt(sk, level, optname, optval, optlen); 1459 1460 if (level != SOL_IPV6) 1461 return -ENOPROTOOPT; 1462 1463 err = do_ipv6_getsockopt(sk, level, optname, 1464 USER_SOCKPTR(optval), USER_SOCKPTR(optlen)); 1465 #ifdef CONFIG_NETFILTER 1466 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1467 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) { 1468 int len; 1469 1470 if (get_user(len, optlen)) 1471 return -EFAULT; 1472 1473 err = nf_getsockopt(sk, PF_INET6, optname, optval, &len); 1474 if (err >= 0) 1475 err = put_user(len, optlen); 1476 } 1477 #endif 1478 return err; 1479 } 1480 EXPORT_SYMBOL(ipv6_getsockopt); 1481