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 = unrcu_pointer(xchg(&inet6_sk(sk)->opt, RCU_INITIALIZER(opt))); 115 sk_dst_reset(sk); 116 117 return opt; 118 } 119 120 static bool setsockopt_needs_rtnl(int optname) 121 { 122 switch (optname) { 123 case IPV6_JOIN_ANYCAST: 124 return true; 125 } 126 return false; 127 } 128 129 static int copy_group_source_from_sockptr(struct group_source_req *greqs, 130 sockptr_t optval, int optlen) 131 { 132 if (in_compat_syscall()) { 133 struct compat_group_source_req gr32; 134 135 if (optlen < sizeof(gr32)) 136 return -EINVAL; 137 if (copy_from_sockptr(&gr32, optval, sizeof(gr32))) 138 return -EFAULT; 139 greqs->gsr_interface = gr32.gsr_interface; 140 greqs->gsr_group = gr32.gsr_group; 141 greqs->gsr_source = gr32.gsr_source; 142 } else { 143 if (optlen < sizeof(*greqs)) 144 return -EINVAL; 145 if (copy_from_sockptr(greqs, optval, sizeof(*greqs))) 146 return -EFAULT; 147 } 148 149 return 0; 150 } 151 152 static int do_ipv6_mcast_group_source(struct sock *sk, int optname, 153 sockptr_t optval, int optlen) 154 { 155 struct group_source_req greqs; 156 int omode, add; 157 int ret; 158 159 ret = copy_group_source_from_sockptr(&greqs, optval, optlen); 160 if (ret) 161 return ret; 162 163 if (greqs.gsr_group.ss_family != AF_INET6 || 164 greqs.gsr_source.ss_family != AF_INET6) 165 return -EADDRNOTAVAIL; 166 167 if (optname == MCAST_BLOCK_SOURCE) { 168 omode = MCAST_EXCLUDE; 169 add = 1; 170 } else if (optname == MCAST_UNBLOCK_SOURCE) { 171 omode = MCAST_EXCLUDE; 172 add = 0; 173 } else if (optname == MCAST_JOIN_SOURCE_GROUP) { 174 struct sockaddr_in6 *psin6; 175 int retv; 176 177 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group; 178 retv = ipv6_sock_mc_join_ssm(sk, greqs.gsr_interface, 179 &psin6->sin6_addr, 180 MCAST_INCLUDE); 181 /* prior join w/ different source is ok */ 182 if (retv && retv != -EADDRINUSE) 183 return retv; 184 omode = MCAST_INCLUDE; 185 add = 1; 186 } else /* MCAST_LEAVE_SOURCE_GROUP */ { 187 omode = MCAST_INCLUDE; 188 add = 0; 189 } 190 return ip6_mc_source(add, omode, sk, &greqs); 191 } 192 193 static int ipv6_set_mcast_msfilter(struct sock *sk, sockptr_t optval, 194 int optlen) 195 { 196 struct group_filter *gsf; 197 int ret; 198 199 if (optlen < GROUP_FILTER_SIZE(0)) 200 return -EINVAL; 201 if (optlen > READ_ONCE(sock_net(sk)->core.sysctl_optmem_max)) 202 return -ENOBUFS; 203 204 gsf = memdup_sockptr(optval, optlen); 205 if (IS_ERR(gsf)) 206 return PTR_ERR(gsf); 207 208 /* numsrc >= (4G-140)/128 overflow in 32 bits */ 209 ret = -ENOBUFS; 210 if (gsf->gf_numsrc >= 0x1ffffffU || 211 gsf->gf_numsrc > sysctl_mld_max_msf) 212 goto out_free_gsf; 213 214 ret = -EINVAL; 215 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) 216 goto out_free_gsf; 217 218 ret = ip6_mc_msfilter(sk, gsf, gsf->gf_slist_flex); 219 out_free_gsf: 220 kfree(gsf); 221 return ret; 222 } 223 224 static int compat_ipv6_set_mcast_msfilter(struct sock *sk, sockptr_t optval, 225 int optlen) 226 { 227 const int size0 = offsetof(struct compat_group_filter, gf_slist_flex); 228 struct compat_group_filter *gf32; 229 void *p; 230 int ret; 231 int n; 232 233 if (optlen < size0) 234 return -EINVAL; 235 if (optlen > READ_ONCE(sock_net(sk)->core.sysctl_optmem_max) - 4) 236 return -ENOBUFS; 237 238 p = kmalloc(optlen + 4, GFP_KERNEL); 239 if (!p) 240 return -ENOMEM; 241 242 gf32 = p + 4; /* we want ->gf_group and ->gf_slist_flex aligned */ 243 ret = -EFAULT; 244 if (copy_from_sockptr(gf32, optval, optlen)) 245 goto out_free_p; 246 247 /* numsrc >= (4G-140)/128 overflow in 32 bits */ 248 ret = -ENOBUFS; 249 n = gf32->gf_numsrc; 250 if (n >= 0x1ffffffU || n > sysctl_mld_max_msf) 251 goto out_free_p; 252 253 ret = -EINVAL; 254 if (offsetof(struct compat_group_filter, gf_slist_flex[n]) > optlen) 255 goto out_free_p; 256 257 ret = ip6_mc_msfilter(sk, &(struct group_filter){ 258 .gf_interface = gf32->gf_interface, 259 .gf_group = gf32->gf_group, 260 .gf_fmode = gf32->gf_fmode, 261 .gf_numsrc = gf32->gf_numsrc}, gf32->gf_slist_flex); 262 263 out_free_p: 264 kfree(p); 265 return ret; 266 } 267 268 static int ipv6_mcast_join_leave(struct sock *sk, int optname, 269 sockptr_t optval, int optlen) 270 { 271 struct sockaddr_in6 *psin6; 272 struct group_req greq; 273 274 if (optlen < sizeof(greq)) 275 return -EINVAL; 276 if (copy_from_sockptr(&greq, optval, sizeof(greq))) 277 return -EFAULT; 278 279 if (greq.gr_group.ss_family != AF_INET6) 280 return -EADDRNOTAVAIL; 281 psin6 = (struct sockaddr_in6 *)&greq.gr_group; 282 if (optname == MCAST_JOIN_GROUP) 283 return ipv6_sock_mc_join(sk, greq.gr_interface, 284 &psin6->sin6_addr); 285 return ipv6_sock_mc_drop(sk, greq.gr_interface, &psin6->sin6_addr); 286 } 287 288 static int compat_ipv6_mcast_join_leave(struct sock *sk, int optname, 289 sockptr_t optval, int optlen) 290 { 291 struct compat_group_req gr32; 292 struct sockaddr_in6 *psin6; 293 294 if (optlen < sizeof(gr32)) 295 return -EINVAL; 296 if (copy_from_sockptr(&gr32, optval, sizeof(gr32))) 297 return -EFAULT; 298 299 if (gr32.gr_group.ss_family != AF_INET6) 300 return -EADDRNOTAVAIL; 301 psin6 = (struct sockaddr_in6 *)&gr32.gr_group; 302 if (optname == MCAST_JOIN_GROUP) 303 return ipv6_sock_mc_join(sk, gr32.gr_interface, 304 &psin6->sin6_addr); 305 return ipv6_sock_mc_drop(sk, gr32.gr_interface, &psin6->sin6_addr); 306 } 307 308 static int ipv6_set_opt_hdr(struct sock *sk, int optname, sockptr_t optval, 309 int optlen) 310 { 311 struct ipv6_pinfo *np = inet6_sk(sk); 312 struct ipv6_opt_hdr *new = NULL; 313 struct net *net = sock_net(sk); 314 struct ipv6_txoptions *opt; 315 int err; 316 317 /* hop-by-hop / destination options are privileged option */ 318 if (optname != IPV6_RTHDR && !sockopt_ns_capable(net->user_ns, CAP_NET_RAW)) 319 return -EPERM; 320 321 /* remove any sticky options header with a zero option 322 * length, per RFC3542. 323 */ 324 if (optlen > 0) { 325 if (sockptr_is_null(optval)) 326 return -EINVAL; 327 if (optlen < sizeof(struct ipv6_opt_hdr) || 328 optlen & 0x7 || 329 optlen > 8 * 255) 330 return -EINVAL; 331 332 new = memdup_sockptr(optval, optlen); 333 if (IS_ERR(new)) 334 return PTR_ERR(new); 335 if (unlikely(ipv6_optlen(new) > optlen)) { 336 kfree(new); 337 return -EINVAL; 338 } 339 } 340 341 opt = rcu_dereference_protected(np->opt, lockdep_sock_is_held(sk)); 342 opt = ipv6_renew_options(sk, opt, optname, new); 343 kfree(new); 344 if (IS_ERR(opt)) 345 return PTR_ERR(opt); 346 347 /* routing header option needs extra check */ 348 err = -EINVAL; 349 if (optname == IPV6_RTHDR && opt && opt->srcrt) { 350 struct ipv6_rt_hdr *rthdr = opt->srcrt; 351 switch (rthdr->type) { 352 #if IS_ENABLED(CONFIG_IPV6_MIP6) 353 case IPV6_SRCRT_TYPE_2: 354 if (rthdr->hdrlen != 2 || rthdr->segments_left != 1) 355 goto sticky_done; 356 break; 357 #endif 358 case IPV6_SRCRT_TYPE_4: 359 { 360 struct ipv6_sr_hdr *srh = 361 (struct ipv6_sr_hdr *)opt->srcrt; 362 363 if (!seg6_validate_srh(srh, optlen, false)) 364 goto sticky_done; 365 break; 366 } 367 default: 368 goto sticky_done; 369 } 370 } 371 372 err = 0; 373 opt = ipv6_update_options(sk, opt); 374 sticky_done: 375 if (opt) { 376 atomic_sub(opt->tot_len, &sk->sk_omem_alloc); 377 txopt_put(opt); 378 } 379 return err; 380 } 381 382 int do_ipv6_setsockopt(struct sock *sk, int level, int optname, 383 sockptr_t optval, unsigned int optlen) 384 { 385 struct ipv6_pinfo *np = inet6_sk(sk); 386 struct net *net = sock_net(sk); 387 int val, valbool; 388 int retv = -ENOPROTOOPT; 389 bool needs_rtnl = setsockopt_needs_rtnl(optname); 390 391 if (sockptr_is_null(optval)) 392 val = 0; 393 else { 394 if (optlen >= sizeof(int)) { 395 if (copy_from_sockptr(&val, optval, sizeof(val))) 396 return -EFAULT; 397 } else 398 val = 0; 399 } 400 401 valbool = (val != 0); 402 403 if (ip6_mroute_opt(optname)) 404 return ip6_mroute_setsockopt(sk, optname, optval, optlen); 405 406 /* Handle options that can be set without locking the socket. */ 407 switch (optname) { 408 case IPV6_UNICAST_HOPS: 409 if (optlen < sizeof(int)) 410 return -EINVAL; 411 if (val > 255 || val < -1) 412 return -EINVAL; 413 WRITE_ONCE(np->hop_limit, val); 414 return 0; 415 case IPV6_MULTICAST_LOOP: 416 if (optlen < sizeof(int)) 417 return -EINVAL; 418 if (val != valbool) 419 return -EINVAL; 420 inet6_assign_bit(MC6_LOOP, sk, valbool); 421 return 0; 422 case IPV6_MULTICAST_HOPS: 423 if (sk->sk_type == SOCK_STREAM) 424 return retv; 425 if (optlen < sizeof(int)) 426 return -EINVAL; 427 if (val > 255 || val < -1) 428 return -EINVAL; 429 WRITE_ONCE(np->mcast_hops, 430 val == -1 ? IPV6_DEFAULT_MCASTHOPS : val); 431 return 0; 432 case IPV6_MTU: 433 if (optlen < sizeof(int)) 434 return -EINVAL; 435 if (val && val < IPV6_MIN_MTU) 436 return -EINVAL; 437 WRITE_ONCE(np->frag_size, val); 438 return 0; 439 case IPV6_MINHOPCOUNT: 440 if (optlen < sizeof(int)) 441 return -EINVAL; 442 if (val < 0 || val > 255) 443 return -EINVAL; 444 445 if (val) 446 static_branch_enable(&ip6_min_hopcount); 447 448 /* tcp_v6_err() and tcp_v6_rcv() might read min_hopcount 449 * while we are changing it. 450 */ 451 WRITE_ONCE(np->min_hopcount, val); 452 return 0; 453 case IPV6_RECVERR_RFC4884: 454 if (optlen < sizeof(int)) 455 return -EINVAL; 456 if (val < 0 || val > 1) 457 return -EINVAL; 458 inet6_assign_bit(RECVERR6_RFC4884, sk, valbool); 459 return 0; 460 case IPV6_MULTICAST_ALL: 461 if (optlen < sizeof(int)) 462 return -EINVAL; 463 inet6_assign_bit(MC6_ALL, sk, valbool); 464 return 0; 465 case IPV6_AUTOFLOWLABEL: 466 inet6_assign_bit(AUTOFLOWLABEL, sk, valbool); 467 inet6_set_bit(AUTOFLOWLABEL_SET, sk); 468 return 0; 469 case IPV6_DONTFRAG: 470 inet6_assign_bit(DONTFRAG, sk, valbool); 471 return 0; 472 case IPV6_RECVERR: 473 if (optlen < sizeof(int)) 474 return -EINVAL; 475 inet6_assign_bit(RECVERR6, sk, valbool); 476 if (!val) 477 skb_errqueue_purge(&sk->sk_error_queue); 478 return 0; 479 case IPV6_ROUTER_ALERT_ISOLATE: 480 if (optlen < sizeof(int)) 481 return -EINVAL; 482 inet6_assign_bit(RTALERT_ISOLATE, sk, valbool); 483 return 0; 484 case IPV6_MTU_DISCOVER: 485 if (optlen < sizeof(int)) 486 return -EINVAL; 487 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT) 488 return -EINVAL; 489 WRITE_ONCE(np->pmtudisc, val); 490 return 0; 491 case IPV6_FLOWINFO_SEND: 492 if (optlen < sizeof(int)) 493 return -EINVAL; 494 inet6_assign_bit(SNDFLOW, sk, valbool); 495 return 0; 496 case IPV6_ADDR_PREFERENCES: 497 if (optlen < sizeof(int)) 498 return -EINVAL; 499 return ip6_sock_set_addr_preferences(sk, val); 500 case IPV6_MULTICAST_IF: 501 if (sk->sk_type == SOCK_STREAM) 502 return -ENOPROTOOPT; 503 if (optlen < sizeof(int)) 504 return -EINVAL; 505 if (val) { 506 struct net_device *dev; 507 int bound_dev_if, midx; 508 509 rcu_read_lock(); 510 511 dev = dev_get_by_index_rcu(net, val); 512 if (!dev) { 513 rcu_read_unlock(); 514 return -ENODEV; 515 } 516 midx = l3mdev_master_ifindex_rcu(dev); 517 518 rcu_read_unlock(); 519 520 bound_dev_if = READ_ONCE(sk->sk_bound_dev_if); 521 if (bound_dev_if && 522 bound_dev_if != val && 523 (!midx || midx != bound_dev_if)) 524 return -EINVAL; 525 } 526 WRITE_ONCE(np->mcast_oif, val); 527 return 0; 528 case IPV6_UNICAST_IF: 529 { 530 struct net_device *dev; 531 int ifindex; 532 533 if (optlen != sizeof(int)) 534 return -EINVAL; 535 536 ifindex = (__force int)ntohl((__force __be32)val); 537 if (!ifindex) { 538 WRITE_ONCE(np->ucast_oif, 0); 539 return 0; 540 } 541 542 dev = dev_get_by_index(net, ifindex); 543 if (!dev) 544 return -EADDRNOTAVAIL; 545 dev_put(dev); 546 547 if (READ_ONCE(sk->sk_bound_dev_if)) 548 return -EINVAL; 549 550 WRITE_ONCE(np->ucast_oif, ifindex); 551 return 0; 552 } 553 } 554 if (needs_rtnl) 555 rtnl_lock(); 556 sockopt_lock_sock(sk); 557 558 /* Another thread has converted the socket into IPv4 with 559 * IPV6_ADDRFORM concurrently. 560 */ 561 if (unlikely(sk->sk_family != AF_INET6)) 562 goto unlock; 563 564 switch (optname) { 565 566 case IPV6_ADDRFORM: 567 if (optlen < sizeof(int)) 568 goto e_inval; 569 if (val == PF_INET) { 570 if (sk->sk_type == SOCK_RAW) 571 break; 572 573 if (sk->sk_protocol == IPPROTO_UDP || 574 sk->sk_protocol == IPPROTO_UDPLITE) { 575 struct udp_sock *up = udp_sk(sk); 576 if (up->pending == AF_INET6) { 577 retv = -EBUSY; 578 break; 579 } 580 } else if (sk->sk_protocol == IPPROTO_TCP) { 581 if (sk->sk_prot != &tcpv6_prot) { 582 retv = -EBUSY; 583 break; 584 } 585 } else { 586 break; 587 } 588 589 if (sk->sk_state != TCP_ESTABLISHED) { 590 retv = -ENOTCONN; 591 break; 592 } 593 594 if (ipv6_only_sock(sk) || 595 !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) { 596 retv = -EADDRNOTAVAIL; 597 break; 598 } 599 600 __ipv6_sock_mc_close(sk); 601 __ipv6_sock_ac_close(sk); 602 603 if (sk->sk_protocol == IPPROTO_TCP) { 604 struct inet_connection_sock *icsk = inet_csk(sk); 605 606 sock_prot_inuse_add(net, sk->sk_prot, -1); 607 sock_prot_inuse_add(net, &tcp_prot, 1); 608 609 /* Paired with READ_ONCE(sk->sk_prot) in inet6_stream_ops */ 610 WRITE_ONCE(sk->sk_prot, &tcp_prot); 611 /* Paired with READ_ONCE() in tcp_(get|set)sockopt() */ 612 WRITE_ONCE(icsk->icsk_af_ops, &ipv4_specific); 613 WRITE_ONCE(sk->sk_socket->ops, &inet_stream_ops); 614 WRITE_ONCE(sk->sk_family, PF_INET); 615 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie); 616 } else { 617 struct proto *prot = &udp_prot; 618 619 if (sk->sk_protocol == IPPROTO_UDPLITE) 620 prot = &udplite_prot; 621 622 sock_prot_inuse_add(net, sk->sk_prot, -1); 623 sock_prot_inuse_add(net, prot, 1); 624 625 /* Paired with READ_ONCE(sk->sk_prot) in inet6_dgram_ops */ 626 WRITE_ONCE(sk->sk_prot, prot); 627 WRITE_ONCE(sk->sk_socket->ops, &inet_dgram_ops); 628 WRITE_ONCE(sk->sk_family, PF_INET); 629 } 630 631 /* Disable all options not to allocate memory anymore, 632 * but there is still a race. See the lockless path 633 * in udpv6_sendmsg() and ipv6_local_rxpmtu(). 634 */ 635 np->rxopt.all = 0; 636 637 inet6_cleanup_sock(sk); 638 639 module_put(THIS_MODULE); 640 retv = 0; 641 break; 642 } 643 goto e_inval; 644 645 case IPV6_V6ONLY: 646 if (optlen < sizeof(int) || 647 inet_sk(sk)->inet_num) 648 goto e_inval; 649 sk->sk_ipv6only = valbool; 650 retv = 0; 651 break; 652 653 case IPV6_RECVPKTINFO: 654 if (optlen < sizeof(int)) 655 goto e_inval; 656 np->rxopt.bits.rxinfo = valbool; 657 retv = 0; 658 break; 659 660 case IPV6_2292PKTINFO: 661 if (optlen < sizeof(int)) 662 goto e_inval; 663 np->rxopt.bits.rxoinfo = valbool; 664 retv = 0; 665 break; 666 667 case IPV6_RECVHOPLIMIT: 668 if (optlen < sizeof(int)) 669 goto e_inval; 670 np->rxopt.bits.rxhlim = valbool; 671 retv = 0; 672 break; 673 674 case IPV6_2292HOPLIMIT: 675 if (optlen < sizeof(int)) 676 goto e_inval; 677 np->rxopt.bits.rxohlim = valbool; 678 retv = 0; 679 break; 680 681 case IPV6_RECVRTHDR: 682 if (optlen < sizeof(int)) 683 goto e_inval; 684 np->rxopt.bits.srcrt = valbool; 685 retv = 0; 686 break; 687 688 case IPV6_2292RTHDR: 689 if (optlen < sizeof(int)) 690 goto e_inval; 691 np->rxopt.bits.osrcrt = valbool; 692 retv = 0; 693 break; 694 695 case IPV6_RECVHOPOPTS: 696 if (optlen < sizeof(int)) 697 goto e_inval; 698 np->rxopt.bits.hopopts = valbool; 699 retv = 0; 700 break; 701 702 case IPV6_2292HOPOPTS: 703 if (optlen < sizeof(int)) 704 goto e_inval; 705 np->rxopt.bits.ohopopts = valbool; 706 retv = 0; 707 break; 708 709 case IPV6_RECVDSTOPTS: 710 if (optlen < sizeof(int)) 711 goto e_inval; 712 np->rxopt.bits.dstopts = valbool; 713 retv = 0; 714 break; 715 716 case IPV6_2292DSTOPTS: 717 if (optlen < sizeof(int)) 718 goto e_inval; 719 np->rxopt.bits.odstopts = valbool; 720 retv = 0; 721 break; 722 723 case IPV6_TCLASS: 724 if (optlen < sizeof(int)) 725 goto e_inval; 726 if (val < -1 || val > 0xff) 727 goto e_inval; 728 /* RFC 3542, 6.5: default traffic class of 0x0 */ 729 if (val == -1) 730 val = 0; 731 if (sk->sk_type == SOCK_STREAM) { 732 val &= ~INET_ECN_MASK; 733 val |= np->tclass & INET_ECN_MASK; 734 } 735 if (np->tclass != val) { 736 np->tclass = val; 737 sk_dst_reset(sk); 738 } 739 retv = 0; 740 break; 741 742 case IPV6_RECVTCLASS: 743 if (optlen < sizeof(int)) 744 goto e_inval; 745 np->rxopt.bits.rxtclass = valbool; 746 retv = 0; 747 break; 748 749 case IPV6_FLOWINFO: 750 if (optlen < sizeof(int)) 751 goto e_inval; 752 np->rxopt.bits.rxflow = valbool; 753 retv = 0; 754 break; 755 756 case IPV6_RECVPATHMTU: 757 if (optlen < sizeof(int)) 758 goto e_inval; 759 np->rxopt.bits.rxpmtu = valbool; 760 retv = 0; 761 break; 762 763 case IPV6_TRANSPARENT: 764 if (valbool && !sockopt_ns_capable(net->user_ns, CAP_NET_RAW) && 765 !sockopt_ns_capable(net->user_ns, CAP_NET_ADMIN)) { 766 retv = -EPERM; 767 break; 768 } 769 if (optlen < sizeof(int)) 770 goto e_inval; 771 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */ 772 inet_assign_bit(TRANSPARENT, sk, valbool); 773 retv = 0; 774 break; 775 776 case IPV6_FREEBIND: 777 if (optlen < sizeof(int)) 778 goto e_inval; 779 /* we also don't have a separate freebind bit for IPV6 */ 780 inet_assign_bit(FREEBIND, sk, valbool); 781 retv = 0; 782 break; 783 784 case IPV6_RECVORIGDSTADDR: 785 if (optlen < sizeof(int)) 786 goto e_inval; 787 np->rxopt.bits.rxorigdstaddr = valbool; 788 retv = 0; 789 break; 790 791 case IPV6_HOPOPTS: 792 case IPV6_RTHDRDSTOPTS: 793 case IPV6_RTHDR: 794 case IPV6_DSTOPTS: 795 retv = ipv6_set_opt_hdr(sk, optname, optval, optlen); 796 break; 797 798 case IPV6_PKTINFO: 799 { 800 struct in6_pktinfo pkt; 801 802 if (optlen == 0) 803 goto e_inval; 804 else if (optlen < sizeof(struct in6_pktinfo) || 805 sockptr_is_null(optval)) 806 goto e_inval; 807 808 if (copy_from_sockptr(&pkt, optval, sizeof(pkt))) { 809 retv = -EFAULT; 810 break; 811 } 812 if (!sk_dev_equal_l3scope(sk, pkt.ipi6_ifindex)) 813 goto e_inval; 814 815 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex; 816 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr; 817 retv = 0; 818 break; 819 } 820 821 case IPV6_2292PKTOPTIONS: 822 { 823 struct ipv6_txoptions *opt = NULL; 824 struct msghdr msg; 825 struct flowi6 fl6; 826 struct ipcm6_cookie ipc6; 827 828 memset(&fl6, 0, sizeof(fl6)); 829 fl6.flowi6_oif = sk->sk_bound_dev_if; 830 fl6.flowi6_mark = sk->sk_mark; 831 832 if (optlen == 0) 833 goto update; 834 835 /* 1K is probably excessive 836 * 1K is surely not enough, 2K per standard header is 16K. 837 */ 838 retv = -EINVAL; 839 if (optlen > 64*1024) 840 break; 841 842 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL); 843 retv = -ENOBUFS; 844 if (!opt) 845 break; 846 847 memset(opt, 0, sizeof(*opt)); 848 refcount_set(&opt->refcnt, 1); 849 opt->tot_len = sizeof(*opt) + optlen; 850 retv = -EFAULT; 851 if (copy_from_sockptr(opt + 1, optval, optlen)) 852 goto done; 853 854 msg.msg_controllen = optlen; 855 msg.msg_control_is_user = false; 856 msg.msg_control = (void *)(opt+1); 857 ipc6.opt = opt; 858 859 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6); 860 if (retv) 861 goto done; 862 update: 863 retv = 0; 864 opt = ipv6_update_options(sk, opt); 865 done: 866 if (opt) { 867 atomic_sub(opt->tot_len, &sk->sk_omem_alloc); 868 txopt_put(opt); 869 } 870 break; 871 } 872 873 case IPV6_ADD_MEMBERSHIP: 874 case IPV6_DROP_MEMBERSHIP: 875 { 876 struct ipv6_mreq mreq; 877 878 if (optlen < sizeof(struct ipv6_mreq)) 879 goto e_inval; 880 881 retv = -EPROTO; 882 if (inet_test_bit(IS_ICSK, sk)) 883 break; 884 885 retv = -EFAULT; 886 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq))) 887 break; 888 889 if (optname == IPV6_ADD_MEMBERSHIP) 890 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr); 891 else 892 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr); 893 break; 894 } 895 case IPV6_JOIN_ANYCAST: 896 case IPV6_LEAVE_ANYCAST: 897 { 898 struct ipv6_mreq mreq; 899 900 if (optlen < sizeof(struct ipv6_mreq)) 901 goto e_inval; 902 903 retv = -EFAULT; 904 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq))) 905 break; 906 907 if (optname == IPV6_JOIN_ANYCAST) 908 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr); 909 else 910 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr); 911 break; 912 } 913 case MCAST_JOIN_GROUP: 914 case MCAST_LEAVE_GROUP: 915 if (in_compat_syscall()) 916 retv = compat_ipv6_mcast_join_leave(sk, optname, optval, 917 optlen); 918 else 919 retv = ipv6_mcast_join_leave(sk, optname, optval, 920 optlen); 921 break; 922 case MCAST_JOIN_SOURCE_GROUP: 923 case MCAST_LEAVE_SOURCE_GROUP: 924 case MCAST_BLOCK_SOURCE: 925 case MCAST_UNBLOCK_SOURCE: 926 retv = do_ipv6_mcast_group_source(sk, optname, optval, optlen); 927 break; 928 case MCAST_MSFILTER: 929 if (in_compat_syscall()) 930 retv = compat_ipv6_set_mcast_msfilter(sk, optval, 931 optlen); 932 else 933 retv = ipv6_set_mcast_msfilter(sk, optval, optlen); 934 break; 935 case IPV6_ROUTER_ALERT: 936 if (optlen < sizeof(int)) 937 goto e_inval; 938 retv = ip6_ra_control(sk, val); 939 if (retv == 0) 940 inet6_assign_bit(RTALERT, sk, valbool); 941 break; 942 case IPV6_FLOWLABEL_MGR: 943 retv = ipv6_flowlabel_opt(sk, optval, optlen); 944 break; 945 case IPV6_IPSEC_POLICY: 946 case IPV6_XFRM_POLICY: 947 retv = -EPERM; 948 if (!sockopt_ns_capable(net->user_ns, CAP_NET_ADMIN)) 949 break; 950 retv = xfrm_user_policy(sk, optname, optval, optlen); 951 break; 952 953 case IPV6_RECVFRAGSIZE: 954 np->rxopt.bits.recvfragsize = valbool; 955 retv = 0; 956 break; 957 } 958 959 unlock: 960 sockopt_release_sock(sk); 961 if (needs_rtnl) 962 rtnl_unlock(); 963 964 return retv; 965 966 e_inval: 967 retv = -EINVAL; 968 goto unlock; 969 } 970 971 int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, 972 unsigned int optlen) 973 { 974 int err; 975 976 if (level == SOL_IP && sk->sk_type != SOCK_RAW) 977 return ip_setsockopt(sk, level, optname, optval, optlen); 978 979 if (level != SOL_IPV6) 980 return -ENOPROTOOPT; 981 982 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen); 983 #ifdef CONFIG_NETFILTER 984 /* we need to exclude all possible ENOPROTOOPTs except default case */ 985 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY && 986 optname != IPV6_XFRM_POLICY) 987 err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen); 988 #endif 989 return err; 990 } 991 EXPORT_SYMBOL(ipv6_setsockopt); 992 993 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt, 994 int optname, sockptr_t optval, int len) 995 { 996 struct ipv6_opt_hdr *hdr; 997 998 if (!opt) 999 return 0; 1000 1001 switch (optname) { 1002 case IPV6_HOPOPTS: 1003 hdr = opt->hopopt; 1004 break; 1005 case IPV6_RTHDRDSTOPTS: 1006 hdr = opt->dst0opt; 1007 break; 1008 case IPV6_RTHDR: 1009 hdr = (struct ipv6_opt_hdr *)opt->srcrt; 1010 break; 1011 case IPV6_DSTOPTS: 1012 hdr = opt->dst1opt; 1013 break; 1014 default: 1015 return -EINVAL; /* should not happen */ 1016 } 1017 1018 if (!hdr) 1019 return 0; 1020 1021 len = min_t(unsigned int, len, ipv6_optlen(hdr)); 1022 if (copy_to_sockptr(optval, hdr, len)) 1023 return -EFAULT; 1024 return len; 1025 } 1026 1027 static int ipv6_get_msfilter(struct sock *sk, sockptr_t optval, 1028 sockptr_t optlen, int len) 1029 { 1030 const int size0 = offsetof(struct group_filter, gf_slist_flex); 1031 struct group_filter gsf; 1032 int num; 1033 int err; 1034 1035 if (len < size0) 1036 return -EINVAL; 1037 if (copy_from_sockptr(&gsf, optval, size0)) 1038 return -EFAULT; 1039 if (gsf.gf_group.ss_family != AF_INET6) 1040 return -EADDRNOTAVAIL; 1041 num = gsf.gf_numsrc; 1042 sockopt_lock_sock(sk); 1043 err = ip6_mc_msfget(sk, &gsf, optval, size0); 1044 if (!err) { 1045 if (num > gsf.gf_numsrc) 1046 num = gsf.gf_numsrc; 1047 len = GROUP_FILTER_SIZE(num); 1048 if (copy_to_sockptr(optlen, &len, sizeof(int)) || 1049 copy_to_sockptr(optval, &gsf, size0)) 1050 err = -EFAULT; 1051 } 1052 sockopt_release_sock(sk); 1053 return err; 1054 } 1055 1056 static int compat_ipv6_get_msfilter(struct sock *sk, sockptr_t optval, 1057 sockptr_t optlen, int len) 1058 { 1059 const int size0 = offsetof(struct compat_group_filter, gf_slist_flex); 1060 struct compat_group_filter gf32; 1061 struct group_filter gf; 1062 int err; 1063 int num; 1064 1065 if (len < size0) 1066 return -EINVAL; 1067 1068 if (copy_from_sockptr(&gf32, optval, size0)) 1069 return -EFAULT; 1070 gf.gf_interface = gf32.gf_interface; 1071 gf.gf_fmode = gf32.gf_fmode; 1072 num = gf.gf_numsrc = gf32.gf_numsrc; 1073 gf.gf_group = gf32.gf_group; 1074 1075 if (gf.gf_group.ss_family != AF_INET6) 1076 return -EADDRNOTAVAIL; 1077 1078 sockopt_lock_sock(sk); 1079 err = ip6_mc_msfget(sk, &gf, optval, size0); 1080 sockopt_release_sock(sk); 1081 if (err) 1082 return err; 1083 if (num > gf.gf_numsrc) 1084 num = gf.gf_numsrc; 1085 len = GROUP_FILTER_SIZE(num) - (sizeof(gf)-sizeof(gf32)); 1086 if (copy_to_sockptr(optlen, &len, sizeof(int)) || 1087 copy_to_sockptr_offset(optval, offsetof(struct compat_group_filter, gf_fmode), 1088 &gf.gf_fmode, sizeof(gf32.gf_fmode)) || 1089 copy_to_sockptr_offset(optval, offsetof(struct compat_group_filter, gf_numsrc), 1090 &gf.gf_numsrc, sizeof(gf32.gf_numsrc))) 1091 return -EFAULT; 1092 return 0; 1093 } 1094 1095 int do_ipv6_getsockopt(struct sock *sk, int level, int optname, 1096 sockptr_t optval, sockptr_t optlen) 1097 { 1098 struct ipv6_pinfo *np = inet6_sk(sk); 1099 int len; 1100 int val; 1101 1102 if (ip6_mroute_opt(optname)) 1103 return ip6_mroute_getsockopt(sk, optname, optval, optlen); 1104 1105 if (copy_from_sockptr(&len, optlen, sizeof(int))) 1106 return -EFAULT; 1107 switch (optname) { 1108 case IPV6_ADDRFORM: 1109 if (sk->sk_protocol != IPPROTO_UDP && 1110 sk->sk_protocol != IPPROTO_UDPLITE && 1111 sk->sk_protocol != IPPROTO_TCP) 1112 return -ENOPROTOOPT; 1113 if (sk->sk_state != TCP_ESTABLISHED) 1114 return -ENOTCONN; 1115 val = sk->sk_family; 1116 break; 1117 case MCAST_MSFILTER: 1118 if (in_compat_syscall()) 1119 return compat_ipv6_get_msfilter(sk, optval, optlen, len); 1120 return ipv6_get_msfilter(sk, optval, optlen, len); 1121 case IPV6_2292PKTOPTIONS: 1122 { 1123 struct msghdr msg; 1124 struct sk_buff *skb; 1125 1126 if (sk->sk_type != SOCK_STREAM) 1127 return -ENOPROTOOPT; 1128 1129 if (optval.is_kernel) { 1130 msg.msg_control_is_user = false; 1131 msg.msg_control = optval.kernel; 1132 } else { 1133 msg.msg_control_is_user = true; 1134 msg.msg_control_user = optval.user; 1135 } 1136 msg.msg_controllen = len; 1137 msg.msg_flags = 0; 1138 1139 sockopt_lock_sock(sk); 1140 skb = np->pktoptions; 1141 if (skb) 1142 ip6_datagram_recv_ctl(sk, &msg, skb); 1143 sockopt_release_sock(sk); 1144 if (!skb) { 1145 if (np->rxopt.bits.rxinfo) { 1146 int mcast_oif = READ_ONCE(np->mcast_oif); 1147 struct in6_pktinfo src_info; 1148 1149 src_info.ipi6_ifindex = mcast_oif ? : 1150 np->sticky_pktinfo.ipi6_ifindex; 1151 src_info.ipi6_addr = mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr; 1152 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info); 1153 } 1154 if (np->rxopt.bits.rxhlim) { 1155 int hlim = READ_ONCE(np->mcast_hops); 1156 1157 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); 1158 } 1159 if (np->rxopt.bits.rxtclass) { 1160 int tclass = (int)ip6_tclass(np->rcv_flowinfo); 1161 1162 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass); 1163 } 1164 if (np->rxopt.bits.rxoinfo) { 1165 int mcast_oif = READ_ONCE(np->mcast_oif); 1166 struct in6_pktinfo src_info; 1167 1168 src_info.ipi6_ifindex = mcast_oif ? : 1169 np->sticky_pktinfo.ipi6_ifindex; 1170 src_info.ipi6_addr = mcast_oif ? sk->sk_v6_daddr : 1171 np->sticky_pktinfo.ipi6_addr; 1172 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); 1173 } 1174 if (np->rxopt.bits.rxohlim) { 1175 int hlim = READ_ONCE(np->mcast_hops); 1176 1177 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); 1178 } 1179 if (np->rxopt.bits.rxflow) { 1180 __be32 flowinfo = np->rcv_flowinfo; 1181 1182 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo); 1183 } 1184 } 1185 len -= msg.msg_controllen; 1186 return copy_to_sockptr(optlen, &len, sizeof(int)); 1187 } 1188 case IPV6_MTU: 1189 { 1190 struct dst_entry *dst; 1191 1192 val = 0; 1193 rcu_read_lock(); 1194 dst = __sk_dst_get(sk); 1195 if (dst) 1196 val = dst_mtu(dst); 1197 rcu_read_unlock(); 1198 if (!val) 1199 return -ENOTCONN; 1200 break; 1201 } 1202 1203 case IPV6_V6ONLY: 1204 val = sk->sk_ipv6only; 1205 break; 1206 1207 case IPV6_RECVPKTINFO: 1208 val = np->rxopt.bits.rxinfo; 1209 break; 1210 1211 case IPV6_2292PKTINFO: 1212 val = np->rxopt.bits.rxoinfo; 1213 break; 1214 1215 case IPV6_RECVHOPLIMIT: 1216 val = np->rxopt.bits.rxhlim; 1217 break; 1218 1219 case IPV6_2292HOPLIMIT: 1220 val = np->rxopt.bits.rxohlim; 1221 break; 1222 1223 case IPV6_RECVRTHDR: 1224 val = np->rxopt.bits.srcrt; 1225 break; 1226 1227 case IPV6_2292RTHDR: 1228 val = np->rxopt.bits.osrcrt; 1229 break; 1230 1231 case IPV6_HOPOPTS: 1232 case IPV6_RTHDRDSTOPTS: 1233 case IPV6_RTHDR: 1234 case IPV6_DSTOPTS: 1235 { 1236 struct ipv6_txoptions *opt; 1237 1238 sockopt_lock_sock(sk); 1239 opt = rcu_dereference_protected(np->opt, 1240 lockdep_sock_is_held(sk)); 1241 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len); 1242 sockopt_release_sock(sk); 1243 /* check if ipv6_getsockopt_sticky() returns err code */ 1244 if (len < 0) 1245 return len; 1246 return copy_to_sockptr(optlen, &len, sizeof(int)); 1247 } 1248 1249 case IPV6_RECVHOPOPTS: 1250 val = np->rxopt.bits.hopopts; 1251 break; 1252 1253 case IPV6_2292HOPOPTS: 1254 val = np->rxopt.bits.ohopopts; 1255 break; 1256 1257 case IPV6_RECVDSTOPTS: 1258 val = np->rxopt.bits.dstopts; 1259 break; 1260 1261 case IPV6_2292DSTOPTS: 1262 val = np->rxopt.bits.odstopts; 1263 break; 1264 1265 case IPV6_TCLASS: 1266 val = np->tclass; 1267 break; 1268 1269 case IPV6_RECVTCLASS: 1270 val = np->rxopt.bits.rxtclass; 1271 break; 1272 1273 case IPV6_FLOWINFO: 1274 val = np->rxopt.bits.rxflow; 1275 break; 1276 1277 case IPV6_RECVPATHMTU: 1278 val = np->rxopt.bits.rxpmtu; 1279 break; 1280 1281 case IPV6_PATHMTU: 1282 { 1283 struct dst_entry *dst; 1284 struct ip6_mtuinfo mtuinfo; 1285 1286 if (len < sizeof(mtuinfo)) 1287 return -EINVAL; 1288 1289 len = sizeof(mtuinfo); 1290 memset(&mtuinfo, 0, sizeof(mtuinfo)); 1291 1292 rcu_read_lock(); 1293 dst = __sk_dst_get(sk); 1294 if (dst) 1295 mtuinfo.ip6m_mtu = dst_mtu(dst); 1296 rcu_read_unlock(); 1297 if (!mtuinfo.ip6m_mtu) 1298 return -ENOTCONN; 1299 1300 if (copy_to_sockptr(optlen, &len, sizeof(int))) 1301 return -EFAULT; 1302 if (copy_to_sockptr(optval, &mtuinfo, len)) 1303 return -EFAULT; 1304 1305 return 0; 1306 } 1307 1308 case IPV6_TRANSPARENT: 1309 val = inet_test_bit(TRANSPARENT, sk); 1310 break; 1311 1312 case IPV6_FREEBIND: 1313 val = inet_test_bit(FREEBIND, sk); 1314 break; 1315 1316 case IPV6_RECVORIGDSTADDR: 1317 val = np->rxopt.bits.rxorigdstaddr; 1318 break; 1319 1320 case IPV6_UNICAST_HOPS: 1321 case IPV6_MULTICAST_HOPS: 1322 { 1323 struct dst_entry *dst; 1324 1325 if (optname == IPV6_UNICAST_HOPS) 1326 val = READ_ONCE(np->hop_limit); 1327 else 1328 val = READ_ONCE(np->mcast_hops); 1329 1330 if (val < 0) { 1331 rcu_read_lock(); 1332 dst = __sk_dst_get(sk); 1333 if (dst) 1334 val = ip6_dst_hoplimit(dst); 1335 rcu_read_unlock(); 1336 } 1337 1338 if (val < 0) 1339 val = READ_ONCE(sock_net(sk)->ipv6.devconf_all->hop_limit); 1340 break; 1341 } 1342 1343 case IPV6_MULTICAST_LOOP: 1344 val = inet6_test_bit(MC6_LOOP, sk); 1345 break; 1346 1347 case IPV6_MULTICAST_IF: 1348 val = READ_ONCE(np->mcast_oif); 1349 break; 1350 1351 case IPV6_MULTICAST_ALL: 1352 val = inet6_test_bit(MC6_ALL, sk); 1353 break; 1354 1355 case IPV6_UNICAST_IF: 1356 val = (__force int)htonl((__u32) READ_ONCE(np->ucast_oif)); 1357 break; 1358 1359 case IPV6_MTU_DISCOVER: 1360 val = READ_ONCE(np->pmtudisc); 1361 break; 1362 1363 case IPV6_RECVERR: 1364 val = inet6_test_bit(RECVERR6, sk); 1365 break; 1366 1367 case IPV6_FLOWINFO_SEND: 1368 val = inet6_test_bit(SNDFLOW, sk); 1369 break; 1370 1371 case IPV6_FLOWLABEL_MGR: 1372 { 1373 struct in6_flowlabel_req freq; 1374 int flags; 1375 1376 if (len < sizeof(freq)) 1377 return -EINVAL; 1378 1379 if (copy_from_sockptr(&freq, optval, sizeof(freq))) 1380 return -EFAULT; 1381 1382 if (freq.flr_action != IPV6_FL_A_GET) 1383 return -EINVAL; 1384 1385 len = sizeof(freq); 1386 flags = freq.flr_flags; 1387 1388 memset(&freq, 0, sizeof(freq)); 1389 1390 val = ipv6_flowlabel_opt_get(sk, &freq, flags); 1391 if (val < 0) 1392 return val; 1393 1394 if (copy_to_sockptr(optlen, &len, sizeof(int))) 1395 return -EFAULT; 1396 if (copy_to_sockptr(optval, &freq, len)) 1397 return -EFAULT; 1398 1399 return 0; 1400 } 1401 1402 case IPV6_ADDR_PREFERENCES: 1403 { 1404 u8 srcprefs = READ_ONCE(np->srcprefs); 1405 val = 0; 1406 1407 if (srcprefs & IPV6_PREFER_SRC_TMP) 1408 val |= IPV6_PREFER_SRC_TMP; 1409 else if (srcprefs & IPV6_PREFER_SRC_PUBLIC) 1410 val |= IPV6_PREFER_SRC_PUBLIC; 1411 else { 1412 /* XXX: should we return system default? */ 1413 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT; 1414 } 1415 1416 if (srcprefs & IPV6_PREFER_SRC_COA) 1417 val |= IPV6_PREFER_SRC_COA; 1418 else 1419 val |= IPV6_PREFER_SRC_HOME; 1420 break; 1421 } 1422 case IPV6_MINHOPCOUNT: 1423 val = READ_ONCE(np->min_hopcount); 1424 break; 1425 1426 case IPV6_DONTFRAG: 1427 val = inet6_test_bit(DONTFRAG, sk); 1428 break; 1429 1430 case IPV6_AUTOFLOWLABEL: 1431 val = ip6_autoflowlabel(sock_net(sk), sk); 1432 break; 1433 1434 case IPV6_RECVFRAGSIZE: 1435 val = np->rxopt.bits.recvfragsize; 1436 break; 1437 1438 case IPV6_ROUTER_ALERT: 1439 val = inet6_test_bit(RTALERT, sk); 1440 break; 1441 1442 case IPV6_ROUTER_ALERT_ISOLATE: 1443 val = inet6_test_bit(RTALERT_ISOLATE, sk); 1444 break; 1445 1446 case IPV6_RECVERR_RFC4884: 1447 val = inet6_test_bit(RECVERR6_RFC4884, sk); 1448 break; 1449 1450 default: 1451 return -ENOPROTOOPT; 1452 } 1453 len = min_t(unsigned int, sizeof(int), len); 1454 if (copy_to_sockptr(optlen, &len, sizeof(int))) 1455 return -EFAULT; 1456 if (copy_to_sockptr(optval, &val, len)) 1457 return -EFAULT; 1458 return 0; 1459 } 1460 1461 int ipv6_getsockopt(struct sock *sk, int level, int optname, 1462 char __user *optval, int __user *optlen) 1463 { 1464 int err; 1465 1466 if (level == SOL_IP && sk->sk_type != SOCK_RAW) 1467 return ip_getsockopt(sk, level, optname, optval, optlen); 1468 1469 if (level != SOL_IPV6) 1470 return -ENOPROTOOPT; 1471 1472 err = do_ipv6_getsockopt(sk, level, optname, 1473 USER_SOCKPTR(optval), USER_SOCKPTR(optlen)); 1474 #ifdef CONFIG_NETFILTER 1475 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1476 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) { 1477 int len; 1478 1479 if (get_user(len, optlen)) 1480 return -EFAULT; 1481 1482 err = nf_getsockopt(sk, PF_INET6, optname, optval, &len); 1483 if (err >= 0) 1484 err = put_user(len, optlen); 1485 } 1486 #endif 1487 return err; 1488 } 1489 EXPORT_SYMBOL(ipv6_getsockopt); 1490