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 55struct ip6_ra_chain *ip6_ra_chain; 56DEFINE_RWLOCK(ip6_ra_lock); 57 58DEFINE_STATIC_KEY_FALSE(ip6_min_hopcount); 59 60int 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 102struct 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 121static 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 141static 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 164static 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 205static 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(sock_net(sk)->core.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); 231out_free_gsf: 232 kfree(gsf); 233 return ret; 234} 235 236static 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(sock_net(sk)->core.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 275out_free_p: 276 kfree(p); 277 return ret; 278} 279 280static 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 300static 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 320static 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); 386sticky_done: 387 if (opt) { 388 atomic_sub(opt->tot_len, &sk->sk_omem_alloc); 389 txopt_put(opt); 390 } 391 return err; 392} 393 394int 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 case IPV6_ADDR_PREFERENCES: 509 if (optlen < sizeof(int)) 510 return -EINVAL; 511 return ip6_sock_set_addr_preferences(sk, val); 512 case IPV6_MULTICAST_IF: 513 if (sk->sk_type == SOCK_STREAM) 514 return -ENOPROTOOPT; 515 if (optlen < sizeof(int)) 516 return -EINVAL; 517 if (val) { 518 struct net_device *dev; 519 int bound_dev_if, midx; 520 521 rcu_read_lock(); 522 523 dev = dev_get_by_index_rcu(net, val); 524 if (!dev) { 525 rcu_read_unlock(); 526 return -ENODEV; 527 } 528 midx = l3mdev_master_ifindex_rcu(dev); 529 530 rcu_read_unlock(); 531 532 bound_dev_if = READ_ONCE(sk->sk_bound_dev_if); 533 if (bound_dev_if && 534 bound_dev_if != val && 535 (!midx || midx != bound_dev_if)) 536 return -EINVAL; 537 } 538 WRITE_ONCE(np->mcast_oif, val); 539 return 0; 540 case IPV6_UNICAST_IF: 541 { 542 struct net_device *dev; 543 int ifindex; 544 545 if (optlen != sizeof(int)) 546 return -EINVAL; 547 548 ifindex = (__force int)ntohl((__force __be32)val); 549 if (!ifindex) { 550 WRITE_ONCE(np->ucast_oif, 0); 551 return 0; 552 } 553 554 dev = dev_get_by_index(net, ifindex); 555 if (!dev) 556 return -EADDRNOTAVAIL; 557 dev_put(dev); 558 559 if (READ_ONCE(sk->sk_bound_dev_if)) 560 return -EINVAL; 561 562 WRITE_ONCE(np->ucast_oif, ifindex); 563 return 0; 564 } 565 } 566 if (needs_rtnl) 567 rtnl_lock(); 568 sockopt_lock_sock(sk); 569 570 /* Another thread has converted the socket into IPv4 with 571 * IPV6_ADDRFORM concurrently. 572 */ 573 if (unlikely(sk->sk_family != AF_INET6)) 574 goto unlock; 575 576 switch (optname) { 577 578 case IPV6_ADDRFORM: 579 if (optlen < sizeof(int)) 580 goto e_inval; 581 if (val == PF_INET) { 582 if (sk->sk_type == SOCK_RAW) 583 break; 584 585 if (sk->sk_protocol == IPPROTO_UDP || 586 sk->sk_protocol == IPPROTO_UDPLITE) { 587 struct udp_sock *up = udp_sk(sk); 588 if (up->pending == AF_INET6) { 589 retv = -EBUSY; 590 break; 591 } 592 } else if (sk->sk_protocol == IPPROTO_TCP) { 593 if (sk->sk_prot != &tcpv6_prot) { 594 retv = -EBUSY; 595 break; 596 } 597 } else { 598 break; 599 } 600 601 if (sk->sk_state != TCP_ESTABLISHED) { 602 retv = -ENOTCONN; 603 break; 604 } 605 606 if (ipv6_only_sock(sk) || 607 !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) { 608 retv = -EADDRNOTAVAIL; 609 break; 610 } 611 612 __ipv6_sock_mc_close(sk); 613 __ipv6_sock_ac_close(sk); 614 615 if (sk->sk_protocol == IPPROTO_TCP) { 616 struct inet_connection_sock *icsk = inet_csk(sk); 617 618 sock_prot_inuse_add(net, sk->sk_prot, -1); 619 sock_prot_inuse_add(net, &tcp_prot, 1); 620 621 /* Paired with READ_ONCE(sk->sk_prot) in inet6_stream_ops */ 622 WRITE_ONCE(sk->sk_prot, &tcp_prot); 623 /* Paired with READ_ONCE() in tcp_(get|set)sockopt() */ 624 WRITE_ONCE(icsk->icsk_af_ops, &ipv4_specific); 625 WRITE_ONCE(sk->sk_socket->ops, &inet_stream_ops); 626 WRITE_ONCE(sk->sk_family, PF_INET); 627 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie); 628 } else { 629 struct proto *prot = &udp_prot; 630 631 if (sk->sk_protocol == IPPROTO_UDPLITE) 632 prot = &udplite_prot; 633 634 sock_prot_inuse_add(net, sk->sk_prot, -1); 635 sock_prot_inuse_add(net, prot, 1); 636 637 /* Paired with READ_ONCE(sk->sk_prot) in inet6_dgram_ops */ 638 WRITE_ONCE(sk->sk_prot, prot); 639 WRITE_ONCE(sk->sk_socket->ops, &inet_dgram_ops); 640 WRITE_ONCE(sk->sk_family, PF_INET); 641 } 642 643 /* Disable all options not to allocate memory anymore, 644 * but there is still a race. See the lockless path 645 * in udpv6_sendmsg() and ipv6_local_rxpmtu(). 646 */ 647 np->rxopt.all = 0; 648 649 inet6_cleanup_sock(sk); 650 651 module_put(THIS_MODULE); 652 retv = 0; 653 break; 654 } 655 goto e_inval; 656 657 case IPV6_V6ONLY: 658 if (optlen < sizeof(int) || 659 inet_sk(sk)->inet_num) 660 goto e_inval; 661 sk->sk_ipv6only = valbool; 662 retv = 0; 663 break; 664 665 case IPV6_RECVPKTINFO: 666 if (optlen < sizeof(int)) 667 goto e_inval; 668 np->rxopt.bits.rxinfo = valbool; 669 retv = 0; 670 break; 671 672 case IPV6_2292PKTINFO: 673 if (optlen < sizeof(int)) 674 goto e_inval; 675 np->rxopt.bits.rxoinfo = valbool; 676 retv = 0; 677 break; 678 679 case IPV6_RECVHOPLIMIT: 680 if (optlen < sizeof(int)) 681 goto e_inval; 682 np->rxopt.bits.rxhlim = valbool; 683 retv = 0; 684 break; 685 686 case IPV6_2292HOPLIMIT: 687 if (optlen < sizeof(int)) 688 goto e_inval; 689 np->rxopt.bits.rxohlim = valbool; 690 retv = 0; 691 break; 692 693 case IPV6_RECVRTHDR: 694 if (optlen < sizeof(int)) 695 goto e_inval; 696 np->rxopt.bits.srcrt = valbool; 697 retv = 0; 698 break; 699 700 case IPV6_2292RTHDR: 701 if (optlen < sizeof(int)) 702 goto e_inval; 703 np->rxopt.bits.osrcrt = valbool; 704 retv = 0; 705 break; 706 707 case IPV6_RECVHOPOPTS: 708 if (optlen < sizeof(int)) 709 goto e_inval; 710 np->rxopt.bits.hopopts = valbool; 711 retv = 0; 712 break; 713 714 case IPV6_2292HOPOPTS: 715 if (optlen < sizeof(int)) 716 goto e_inval; 717 np->rxopt.bits.ohopopts = valbool; 718 retv = 0; 719 break; 720 721 case IPV6_RECVDSTOPTS: 722 if (optlen < sizeof(int)) 723 goto e_inval; 724 np->rxopt.bits.dstopts = valbool; 725 retv = 0; 726 break; 727 728 case IPV6_2292DSTOPTS: 729 if (optlen < sizeof(int)) 730 goto e_inval; 731 np->rxopt.bits.odstopts = valbool; 732 retv = 0; 733 break; 734 735 case IPV6_TCLASS: 736 if (optlen < sizeof(int)) 737 goto e_inval; 738 if (val < -1 || val > 0xff) 739 goto e_inval; 740 /* RFC 3542, 6.5: default traffic class of 0x0 */ 741 if (val == -1) 742 val = 0; 743 if (sk->sk_type == SOCK_STREAM) { 744 val &= ~INET_ECN_MASK; 745 val |= np->tclass & INET_ECN_MASK; 746 } 747 if (np->tclass != val) { 748 np->tclass = val; 749 sk_dst_reset(sk); 750 } 751 retv = 0; 752 break; 753 754 case IPV6_RECVTCLASS: 755 if (optlen < sizeof(int)) 756 goto e_inval; 757 np->rxopt.bits.rxtclass = valbool; 758 retv = 0; 759 break; 760 761 case IPV6_FLOWINFO: 762 if (optlen < sizeof(int)) 763 goto e_inval; 764 np->rxopt.bits.rxflow = valbool; 765 retv = 0; 766 break; 767 768 case IPV6_RECVPATHMTU: 769 if (optlen < sizeof(int)) 770 goto e_inval; 771 np->rxopt.bits.rxpmtu = valbool; 772 retv = 0; 773 break; 774 775 case IPV6_TRANSPARENT: 776 if (valbool && !sockopt_ns_capable(net->user_ns, CAP_NET_RAW) && 777 !sockopt_ns_capable(net->user_ns, CAP_NET_ADMIN)) { 778 retv = -EPERM; 779 break; 780 } 781 if (optlen < sizeof(int)) 782 goto e_inval; 783 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */ 784 inet_assign_bit(TRANSPARENT, sk, valbool); 785 retv = 0; 786 break; 787 788 case IPV6_FREEBIND: 789 if (optlen < sizeof(int)) 790 goto e_inval; 791 /* we also don't have a separate freebind bit for IPV6 */ 792 inet_assign_bit(FREEBIND, sk, valbool); 793 retv = 0; 794 break; 795 796 case IPV6_RECVORIGDSTADDR: 797 if (optlen < sizeof(int)) 798 goto e_inval; 799 np->rxopt.bits.rxorigdstaddr = valbool; 800 retv = 0; 801 break; 802 803 case IPV6_HOPOPTS: 804 case IPV6_RTHDRDSTOPTS: 805 case IPV6_RTHDR: 806 case IPV6_DSTOPTS: 807 retv = ipv6_set_opt_hdr(sk, optname, optval, optlen); 808 break; 809 810 case IPV6_PKTINFO: 811 { 812 struct in6_pktinfo pkt; 813 814 if (optlen == 0) 815 goto e_inval; 816 else if (optlen < sizeof(struct in6_pktinfo) || 817 sockptr_is_null(optval)) 818 goto e_inval; 819 820 if (copy_from_sockptr(&pkt, optval, sizeof(pkt))) { 821 retv = -EFAULT; 822 break; 823 } 824 if (!sk_dev_equal_l3scope(sk, pkt.ipi6_ifindex)) 825 goto e_inval; 826 827 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex; 828 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr; 829 retv = 0; 830 break; 831 } 832 833 case IPV6_2292PKTOPTIONS: 834 { 835 struct ipv6_txoptions *opt = NULL; 836 struct msghdr msg; 837 struct flowi6 fl6; 838 struct ipcm6_cookie ipc6; 839 840 memset(&fl6, 0, sizeof(fl6)); 841 fl6.flowi6_oif = sk->sk_bound_dev_if; 842 fl6.flowi6_mark = sk->sk_mark; 843 844 if (optlen == 0) 845 goto update; 846 847 /* 1K is probably excessive 848 * 1K is surely not enough, 2K per standard header is 16K. 849 */ 850 retv = -EINVAL; 851 if (optlen > 64*1024) 852 break; 853 854 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL); 855 retv = -ENOBUFS; 856 if (!opt) 857 break; 858 859 memset(opt, 0, sizeof(*opt)); 860 refcount_set(&opt->refcnt, 1); 861 opt->tot_len = sizeof(*opt) + optlen; 862 retv = -EFAULT; 863 if (copy_from_sockptr(opt + 1, optval, optlen)) 864 goto done; 865 866 msg.msg_controllen = optlen; 867 msg.msg_control_is_user = false; 868 msg.msg_control = (void *)(opt+1); 869 ipc6.opt = opt; 870 871 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6); 872 if (retv) 873 goto done; 874update: 875 retv = 0; 876 opt = ipv6_update_options(sk, opt); 877done: 878 if (opt) { 879 atomic_sub(opt->tot_len, &sk->sk_omem_alloc); 880 txopt_put(opt); 881 } 882 break; 883 } 884 885 case IPV6_ADD_MEMBERSHIP: 886 case IPV6_DROP_MEMBERSHIP: 887 { 888 struct ipv6_mreq mreq; 889 890 if (optlen < sizeof(struct ipv6_mreq)) 891 goto e_inval; 892 893 retv = -EPROTO; 894 if (inet_test_bit(IS_ICSK, sk)) 895 break; 896 897 retv = -EFAULT; 898 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq))) 899 break; 900 901 if (optname == IPV6_ADD_MEMBERSHIP) 902 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr); 903 else 904 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr); 905 break; 906 } 907 case IPV6_JOIN_ANYCAST: 908 case IPV6_LEAVE_ANYCAST: 909 { 910 struct ipv6_mreq mreq; 911 912 if (optlen < sizeof(struct ipv6_mreq)) 913 goto e_inval; 914 915 retv = -EFAULT; 916 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq))) 917 break; 918 919 if (optname == IPV6_JOIN_ANYCAST) 920 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr); 921 else 922 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr); 923 break; 924 } 925 case MCAST_JOIN_GROUP: 926 case MCAST_LEAVE_GROUP: 927 if (in_compat_syscall()) 928 retv = compat_ipv6_mcast_join_leave(sk, optname, optval, 929 optlen); 930 else 931 retv = ipv6_mcast_join_leave(sk, optname, optval, 932 optlen); 933 break; 934 case MCAST_JOIN_SOURCE_GROUP: 935 case MCAST_LEAVE_SOURCE_GROUP: 936 case MCAST_BLOCK_SOURCE: 937 case MCAST_UNBLOCK_SOURCE: 938 retv = do_ipv6_mcast_group_source(sk, optname, optval, optlen); 939 break; 940 case MCAST_MSFILTER: 941 if (in_compat_syscall()) 942 retv = compat_ipv6_set_mcast_msfilter(sk, optval, 943 optlen); 944 else 945 retv = ipv6_set_mcast_msfilter(sk, optval, optlen); 946 break; 947 case IPV6_ROUTER_ALERT: 948 if (optlen < sizeof(int)) 949 goto e_inval; 950 retv = ip6_ra_control(sk, val); 951 if (retv == 0) 952 inet6_assign_bit(RTALERT, sk, valbool); 953 break; 954 case IPV6_FLOWLABEL_MGR: 955 retv = ipv6_flowlabel_opt(sk, optval, optlen); 956 break; 957 case IPV6_IPSEC_POLICY: 958 case IPV6_XFRM_POLICY: 959 retv = -EPERM; 960 if (!sockopt_ns_capable(net->user_ns, CAP_NET_ADMIN)) 961 break; 962 retv = xfrm_user_policy(sk, optname, optval, optlen); 963 break; 964 965 case IPV6_RECVFRAGSIZE: 966 np->rxopt.bits.recvfragsize = valbool; 967 retv = 0; 968 break; 969 } 970 971unlock: 972 sockopt_release_sock(sk); 973 if (needs_rtnl) 974 rtnl_unlock(); 975 976 return retv; 977 978e_inval: 979 retv = -EINVAL; 980 goto unlock; 981} 982 983int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, 984 unsigned int optlen) 985{ 986 int err; 987 988 if (level == SOL_IP && sk->sk_type != SOCK_RAW) 989 return udp_prot.setsockopt(sk, level, optname, optval, optlen); 990 991 if (level != SOL_IPV6) 992 return -ENOPROTOOPT; 993 994 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen); 995#ifdef CONFIG_NETFILTER 996 /* we need to exclude all possible ENOPROTOOPTs except default case */ 997 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY && 998 optname != IPV6_XFRM_POLICY) 999 err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen); 1000#endif 1001 return err; 1002} 1003EXPORT_SYMBOL(ipv6_setsockopt); 1004 1005static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt, 1006 int optname, sockptr_t optval, int len) 1007{ 1008 struct ipv6_opt_hdr *hdr; 1009 1010 if (!opt) 1011 return 0; 1012 1013 switch (optname) { 1014 case IPV6_HOPOPTS: 1015 hdr = opt->hopopt; 1016 break; 1017 case IPV6_RTHDRDSTOPTS: 1018 hdr = opt->dst0opt; 1019 break; 1020 case IPV6_RTHDR: 1021 hdr = (struct ipv6_opt_hdr *)opt->srcrt; 1022 break; 1023 case IPV6_DSTOPTS: 1024 hdr = opt->dst1opt; 1025 break; 1026 default: 1027 return -EINVAL; /* should not happen */ 1028 } 1029 1030 if (!hdr) 1031 return 0; 1032 1033 len = min_t(unsigned int, len, ipv6_optlen(hdr)); 1034 if (copy_to_sockptr(optval, hdr, len)) 1035 return -EFAULT; 1036 return len; 1037} 1038 1039static int ipv6_get_msfilter(struct sock *sk, sockptr_t optval, 1040 sockptr_t optlen, int len) 1041{ 1042 const int size0 = offsetof(struct group_filter, gf_slist_flex); 1043 struct group_filter gsf; 1044 int num; 1045 int err; 1046 1047 if (len < size0) 1048 return -EINVAL; 1049 if (copy_from_sockptr(&gsf, optval, size0)) 1050 return -EFAULT; 1051 if (gsf.gf_group.ss_family != AF_INET6) 1052 return -EADDRNOTAVAIL; 1053 num = gsf.gf_numsrc; 1054 sockopt_lock_sock(sk); 1055 err = ip6_mc_msfget(sk, &gsf, optval, size0); 1056 if (!err) { 1057 if (num > gsf.gf_numsrc) 1058 num = gsf.gf_numsrc; 1059 len = GROUP_FILTER_SIZE(num); 1060 if (copy_to_sockptr(optlen, &len, sizeof(int)) || 1061 copy_to_sockptr(optval, &gsf, size0)) 1062 err = -EFAULT; 1063 } 1064 sockopt_release_sock(sk); 1065 return err; 1066} 1067 1068static int compat_ipv6_get_msfilter(struct sock *sk, sockptr_t optval, 1069 sockptr_t optlen, int len) 1070{ 1071 const int size0 = offsetof(struct compat_group_filter, gf_slist_flex); 1072 struct compat_group_filter gf32; 1073 struct group_filter gf; 1074 int err; 1075 int num; 1076 1077 if (len < size0) 1078 return -EINVAL; 1079 1080 if (copy_from_sockptr(&gf32, optval, size0)) 1081 return -EFAULT; 1082 gf.gf_interface = gf32.gf_interface; 1083 gf.gf_fmode = gf32.gf_fmode; 1084 num = gf.gf_numsrc = gf32.gf_numsrc; 1085 gf.gf_group = gf32.gf_group; 1086 1087 if (gf.gf_group.ss_family != AF_INET6) 1088 return -EADDRNOTAVAIL; 1089 1090 sockopt_lock_sock(sk); 1091 err = ip6_mc_msfget(sk, &gf, optval, size0); 1092 sockopt_release_sock(sk); 1093 if (err) 1094 return err; 1095 if (num > gf.gf_numsrc) 1096 num = gf.gf_numsrc; 1097 len = GROUP_FILTER_SIZE(num) - (sizeof(gf)-sizeof(gf32)); 1098 if (copy_to_sockptr(optlen, &len, sizeof(int)) || 1099 copy_to_sockptr_offset(optval, offsetof(struct compat_group_filter, gf_fmode), 1100 &gf.gf_fmode, sizeof(gf32.gf_fmode)) || 1101 copy_to_sockptr_offset(optval, offsetof(struct compat_group_filter, gf_numsrc), 1102 &gf.gf_numsrc, sizeof(gf32.gf_numsrc))) 1103 return -EFAULT; 1104 return 0; 1105} 1106 1107int do_ipv6_getsockopt(struct sock *sk, int level, int optname, 1108 sockptr_t optval, sockptr_t optlen) 1109{ 1110 struct ipv6_pinfo *np = inet6_sk(sk); 1111 int len; 1112 int val; 1113 1114 if (ip6_mroute_opt(optname)) 1115 return ip6_mroute_getsockopt(sk, optname, optval, optlen); 1116 1117 if (copy_from_sockptr(&len, optlen, sizeof(int))) 1118 return -EFAULT; 1119 switch (optname) { 1120 case IPV6_ADDRFORM: 1121 if (sk->sk_protocol != IPPROTO_UDP && 1122 sk->sk_protocol != IPPROTO_UDPLITE && 1123 sk->sk_protocol != IPPROTO_TCP) 1124 return -ENOPROTOOPT; 1125 if (sk->sk_state != TCP_ESTABLISHED) 1126 return -ENOTCONN; 1127 val = sk->sk_family; 1128 break; 1129 case MCAST_MSFILTER: 1130 if (in_compat_syscall()) 1131 return compat_ipv6_get_msfilter(sk, optval, optlen, len); 1132 return ipv6_get_msfilter(sk, optval, optlen, len); 1133 case IPV6_2292PKTOPTIONS: 1134 { 1135 struct msghdr msg; 1136 struct sk_buff *skb; 1137 1138 if (sk->sk_type != SOCK_STREAM) 1139 return -ENOPROTOOPT; 1140 1141 if (optval.is_kernel) { 1142 msg.msg_control_is_user = false; 1143 msg.msg_control = optval.kernel; 1144 } else { 1145 msg.msg_control_is_user = true; 1146 msg.msg_control_user = optval.user; 1147 } 1148 msg.msg_controllen = len; 1149 msg.msg_flags = 0; 1150 1151 sockopt_lock_sock(sk); 1152 skb = np->pktoptions; 1153 if (skb) 1154 ip6_datagram_recv_ctl(sk, &msg, skb); 1155 sockopt_release_sock(sk); 1156 if (!skb) { 1157 if (np->rxopt.bits.rxinfo) { 1158 int mcast_oif = READ_ONCE(np->mcast_oif); 1159 struct in6_pktinfo src_info; 1160 1161 src_info.ipi6_ifindex = mcast_oif ? : 1162 np->sticky_pktinfo.ipi6_ifindex; 1163 src_info.ipi6_addr = mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr; 1164 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info); 1165 } 1166 if (np->rxopt.bits.rxhlim) { 1167 int hlim = READ_ONCE(np->mcast_hops); 1168 1169 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); 1170 } 1171 if (np->rxopt.bits.rxtclass) { 1172 int tclass = (int)ip6_tclass(np->rcv_flowinfo); 1173 1174 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass); 1175 } 1176 if (np->rxopt.bits.rxoinfo) { 1177 int mcast_oif = READ_ONCE(np->mcast_oif); 1178 struct in6_pktinfo src_info; 1179 1180 src_info.ipi6_ifindex = mcast_oif ? : 1181 np->sticky_pktinfo.ipi6_ifindex; 1182 src_info.ipi6_addr = mcast_oif ? sk->sk_v6_daddr : 1183 np->sticky_pktinfo.ipi6_addr; 1184 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); 1185 } 1186 if (np->rxopt.bits.rxohlim) { 1187 int hlim = READ_ONCE(np->mcast_hops); 1188 1189 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); 1190 } 1191 if (np->rxopt.bits.rxflow) { 1192 __be32 flowinfo = np->rcv_flowinfo; 1193 1194 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo); 1195 } 1196 } 1197 len -= msg.msg_controllen; 1198 return copy_to_sockptr(optlen, &len, sizeof(int)); 1199 } 1200 case IPV6_MTU: 1201 { 1202 struct dst_entry *dst; 1203 1204 val = 0; 1205 rcu_read_lock(); 1206 dst = __sk_dst_get(sk); 1207 if (dst) 1208 val = dst_mtu(dst); 1209 rcu_read_unlock(); 1210 if (!val) 1211 return -ENOTCONN; 1212 break; 1213 } 1214 1215 case IPV6_V6ONLY: 1216 val = sk->sk_ipv6only; 1217 break; 1218 1219 case IPV6_RECVPKTINFO: 1220 val = np->rxopt.bits.rxinfo; 1221 break; 1222 1223 case IPV6_2292PKTINFO: 1224 val = np->rxopt.bits.rxoinfo; 1225 break; 1226 1227 case IPV6_RECVHOPLIMIT: 1228 val = np->rxopt.bits.rxhlim; 1229 break; 1230 1231 case IPV6_2292HOPLIMIT: 1232 val = np->rxopt.bits.rxohlim; 1233 break; 1234 1235 case IPV6_RECVRTHDR: 1236 val = np->rxopt.bits.srcrt; 1237 break; 1238 1239 case IPV6_2292RTHDR: 1240 val = np->rxopt.bits.osrcrt; 1241 break; 1242 1243 case IPV6_HOPOPTS: 1244 case IPV6_RTHDRDSTOPTS: 1245 case IPV6_RTHDR: 1246 case IPV6_DSTOPTS: 1247 { 1248 struct ipv6_txoptions *opt; 1249 1250 sockopt_lock_sock(sk); 1251 opt = rcu_dereference_protected(np->opt, 1252 lockdep_sock_is_held(sk)); 1253 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len); 1254 sockopt_release_sock(sk); 1255 /* check if ipv6_getsockopt_sticky() returns err code */ 1256 if (len < 0) 1257 return len; 1258 return copy_to_sockptr(optlen, &len, sizeof(int)); 1259 } 1260 1261 case IPV6_RECVHOPOPTS: 1262 val = np->rxopt.bits.hopopts; 1263 break; 1264 1265 case IPV6_2292HOPOPTS: 1266 val = np->rxopt.bits.ohopopts; 1267 break; 1268 1269 case IPV6_RECVDSTOPTS: 1270 val = np->rxopt.bits.dstopts; 1271 break; 1272 1273 case IPV6_2292DSTOPTS: 1274 val = np->rxopt.bits.odstopts; 1275 break; 1276 1277 case IPV6_TCLASS: 1278 val = np->tclass; 1279 break; 1280 1281 case IPV6_RECVTCLASS: 1282 val = np->rxopt.bits.rxtclass; 1283 break; 1284 1285 case IPV6_FLOWINFO: 1286 val = np->rxopt.bits.rxflow; 1287 break; 1288 1289 case IPV6_RECVPATHMTU: 1290 val = np->rxopt.bits.rxpmtu; 1291 break; 1292 1293 case IPV6_PATHMTU: 1294 { 1295 struct dst_entry *dst; 1296 struct ip6_mtuinfo mtuinfo; 1297 1298 if (len < sizeof(mtuinfo)) 1299 return -EINVAL; 1300 1301 len = sizeof(mtuinfo); 1302 memset(&mtuinfo, 0, sizeof(mtuinfo)); 1303 1304 rcu_read_lock(); 1305 dst = __sk_dst_get(sk); 1306 if (dst) 1307 mtuinfo.ip6m_mtu = dst_mtu(dst); 1308 rcu_read_unlock(); 1309 if (!mtuinfo.ip6m_mtu) 1310 return -ENOTCONN; 1311 1312 if (copy_to_sockptr(optlen, &len, sizeof(int))) 1313 return -EFAULT; 1314 if (copy_to_sockptr(optval, &mtuinfo, len)) 1315 return -EFAULT; 1316 1317 return 0; 1318 } 1319 1320 case IPV6_TRANSPARENT: 1321 val = inet_test_bit(TRANSPARENT, sk); 1322 break; 1323 1324 case IPV6_FREEBIND: 1325 val = inet_test_bit(FREEBIND, sk); 1326 break; 1327 1328 case IPV6_RECVORIGDSTADDR: 1329 val = np->rxopt.bits.rxorigdstaddr; 1330 break; 1331 1332 case IPV6_UNICAST_HOPS: 1333 case IPV6_MULTICAST_HOPS: 1334 { 1335 struct dst_entry *dst; 1336 1337 if (optname == IPV6_UNICAST_HOPS) 1338 val = READ_ONCE(np->hop_limit); 1339 else 1340 val = READ_ONCE(np->mcast_hops); 1341 1342 if (val < 0) { 1343 rcu_read_lock(); 1344 dst = __sk_dst_get(sk); 1345 if (dst) 1346 val = ip6_dst_hoplimit(dst); 1347 rcu_read_unlock(); 1348 } 1349 1350 if (val < 0) 1351 val = READ_ONCE(sock_net(sk)->ipv6.devconf_all->hop_limit); 1352 break; 1353 } 1354 1355 case IPV6_MULTICAST_LOOP: 1356 val = inet6_test_bit(MC6_LOOP, sk); 1357 break; 1358 1359 case IPV6_MULTICAST_IF: 1360 val = READ_ONCE(np->mcast_oif); 1361 break; 1362 1363 case IPV6_MULTICAST_ALL: 1364 val = inet6_test_bit(MC6_ALL, sk); 1365 break; 1366 1367 case IPV6_UNICAST_IF: 1368 val = (__force int)htonl((__u32) READ_ONCE(np->ucast_oif)); 1369 break; 1370 1371 case IPV6_MTU_DISCOVER: 1372 val = READ_ONCE(np->pmtudisc); 1373 break; 1374 1375 case IPV6_RECVERR: 1376 val = inet6_test_bit(RECVERR6, sk); 1377 break; 1378 1379 case IPV6_FLOWINFO_SEND: 1380 val = inet6_test_bit(SNDFLOW, sk); 1381 break; 1382 1383 case IPV6_FLOWLABEL_MGR: 1384 { 1385 struct in6_flowlabel_req freq; 1386 int flags; 1387 1388 if (len < sizeof(freq)) 1389 return -EINVAL; 1390 1391 if (copy_from_sockptr(&freq, optval, sizeof(freq))) 1392 return -EFAULT; 1393 1394 if (freq.flr_action != IPV6_FL_A_GET) 1395 return -EINVAL; 1396 1397 len = sizeof(freq); 1398 flags = freq.flr_flags; 1399 1400 memset(&freq, 0, sizeof(freq)); 1401 1402 val = ipv6_flowlabel_opt_get(sk, &freq, flags); 1403 if (val < 0) 1404 return val; 1405 1406 if (copy_to_sockptr(optlen, &len, sizeof(int))) 1407 return -EFAULT; 1408 if (copy_to_sockptr(optval, &freq, len)) 1409 return -EFAULT; 1410 1411 return 0; 1412 } 1413 1414 case IPV6_ADDR_PREFERENCES: 1415 { 1416 u8 srcprefs = READ_ONCE(np->srcprefs); 1417 val = 0; 1418 1419 if (srcprefs & IPV6_PREFER_SRC_TMP) 1420 val |= IPV6_PREFER_SRC_TMP; 1421 else if (srcprefs & IPV6_PREFER_SRC_PUBLIC) 1422 val |= IPV6_PREFER_SRC_PUBLIC; 1423 else { 1424 /* XXX: should we return system default? */ 1425 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT; 1426 } 1427 1428 if (srcprefs & IPV6_PREFER_SRC_COA) 1429 val |= IPV6_PREFER_SRC_COA; 1430 else 1431 val |= IPV6_PREFER_SRC_HOME; 1432 break; 1433 } 1434 case IPV6_MINHOPCOUNT: 1435 val = READ_ONCE(np->min_hopcount); 1436 break; 1437 1438 case IPV6_DONTFRAG: 1439 val = inet6_test_bit(DONTFRAG, sk); 1440 break; 1441 1442 case IPV6_AUTOFLOWLABEL: 1443 val = ip6_autoflowlabel(sock_net(sk), sk); 1444 break; 1445 1446 case IPV6_RECVFRAGSIZE: 1447 val = np->rxopt.bits.recvfragsize; 1448 break; 1449 1450 case IPV6_ROUTER_ALERT: 1451 val = inet6_test_bit(RTALERT, sk); 1452 break; 1453 1454 case IPV6_ROUTER_ALERT_ISOLATE: 1455 val = inet6_test_bit(RTALERT_ISOLATE, sk); 1456 break; 1457 1458 case IPV6_RECVERR_RFC4884: 1459 val = inet6_test_bit(RECVERR6_RFC4884, sk); 1460 break; 1461 1462 default: 1463 return -ENOPROTOOPT; 1464 } 1465 len = min_t(unsigned int, sizeof(int), len); 1466 if (copy_to_sockptr(optlen, &len, sizeof(int))) 1467 return -EFAULT; 1468 if (copy_to_sockptr(optval, &val, len)) 1469 return -EFAULT; 1470 return 0; 1471} 1472 1473int ipv6_getsockopt(struct sock *sk, int level, int optname, 1474 char __user *optval, int __user *optlen) 1475{ 1476 int err; 1477 1478 if (level == SOL_IP && sk->sk_type != SOCK_RAW) 1479 return udp_prot.getsockopt(sk, level, optname, optval, optlen); 1480 1481 if (level != SOL_IPV6) 1482 return -ENOPROTOOPT; 1483 1484 err = do_ipv6_getsockopt(sk, level, optname, 1485 USER_SOCKPTR(optval), USER_SOCKPTR(optlen)); 1486#ifdef CONFIG_NETFILTER 1487 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1488 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) { 1489 int len; 1490 1491 if (get_user(len, optlen)) 1492 return -EFAULT; 1493 1494 err = nf_getsockopt(sk, PF_INET6, optname, optval, &len); 1495 if (err >= 0) 1496 err = put_user(len, optlen); 1497 } 1498#endif 1499 return err; 1500} 1501EXPORT_SYMBOL(ipv6_getsockopt); 1502