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/xfrm.h> 49 #include <net/compat.h> 50 #include <net/seg6.h> 51 #include <net/psp.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_obj(*new_ra) : 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); 110 111 icsk->icsk_ext_hdr_len = 112 psp_sk_overhead(sk) + 113 opt->opt_flen + opt->opt_nflen; 114 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie); 115 } 116 } 117 opt = unrcu_pointer(xchg(&inet6_sk(sk)->opt, RCU_INITIALIZER(opt))); 118 sk_dst_reset(sk); 119 120 return opt; 121 } 122 123 static int copy_group_source_from_sockptr(struct group_source_req *greqs, 124 sockptr_t optval, int optlen) 125 { 126 if (in_compat_syscall()) { 127 struct compat_group_source_req gr32; 128 129 if (optlen < sizeof(gr32)) 130 return -EINVAL; 131 if (copy_from_sockptr(&gr32, optval, sizeof(gr32))) 132 return -EFAULT; 133 greqs->gsr_interface = gr32.gsr_interface; 134 greqs->gsr_group = gr32.gsr_group; 135 greqs->gsr_source = gr32.gsr_source; 136 } else { 137 if (optlen < sizeof(*greqs)) 138 return -EINVAL; 139 if (copy_from_sockptr(greqs, optval, sizeof(*greqs))) 140 return -EFAULT; 141 } 142 143 return 0; 144 } 145 146 static int do_ipv6_mcast_group_source(struct sock *sk, int optname, 147 sockptr_t optval, int optlen) 148 { 149 struct group_source_req greqs; 150 int omode, add; 151 int ret; 152 153 ret = copy_group_source_from_sockptr(&greqs, optval, optlen); 154 if (ret) 155 return ret; 156 157 if (greqs.gsr_group.ss_family != AF_INET6 || 158 greqs.gsr_source.ss_family != AF_INET6) 159 return -EADDRNOTAVAIL; 160 161 if (optname == MCAST_BLOCK_SOURCE) { 162 omode = MCAST_EXCLUDE; 163 add = 1; 164 } else if (optname == MCAST_UNBLOCK_SOURCE) { 165 omode = MCAST_EXCLUDE; 166 add = 0; 167 } else if (optname == MCAST_JOIN_SOURCE_GROUP) { 168 struct sockaddr_in6 *psin6; 169 int retv; 170 171 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group; 172 retv = ipv6_sock_mc_join_ssm(sk, greqs.gsr_interface, 173 &psin6->sin6_addr, 174 MCAST_INCLUDE); 175 /* prior join w/ different source is ok */ 176 if (retv && retv != -EADDRINUSE) 177 return retv; 178 omode = MCAST_INCLUDE; 179 add = 1; 180 } else /* MCAST_LEAVE_SOURCE_GROUP */ { 181 omode = MCAST_INCLUDE; 182 add = 0; 183 } 184 return ip6_mc_source(add, omode, sk, &greqs); 185 } 186 187 static int ipv6_set_mcast_msfilter(struct sock *sk, sockptr_t optval, 188 int optlen) 189 { 190 struct group_filter *gsf; 191 int ret; 192 193 if (optlen < GROUP_FILTER_SIZE(0)) 194 return -EINVAL; 195 if (optlen > READ_ONCE(sock_net(sk)->core.sysctl_optmem_max)) 196 return -ENOBUFS; 197 198 gsf = memdup_sockptr(optval, optlen); 199 if (IS_ERR(gsf)) 200 return PTR_ERR(gsf); 201 202 /* numsrc >= (4G-140)/128 overflow in 32 bits */ 203 ret = -ENOBUFS; 204 if (gsf->gf_numsrc >= 0x1ffffffU || 205 gsf->gf_numsrc > sysctl_mld_max_msf) 206 goto out_free_gsf; 207 208 ret = -EINVAL; 209 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) 210 goto out_free_gsf; 211 212 ret = ip6_mc_msfilter(sk, gsf, gsf->gf_slist_flex); 213 out_free_gsf: 214 kfree(gsf); 215 return ret; 216 } 217 218 static int compat_ipv6_set_mcast_msfilter(struct sock *sk, sockptr_t optval, 219 int optlen) 220 { 221 const int size0 = offsetof(struct compat_group_filter, gf_slist_flex); 222 struct compat_group_filter *gf32; 223 void *p; 224 int ret; 225 int n; 226 227 if (optlen < size0) 228 return -EINVAL; 229 if (optlen > READ_ONCE(sock_net(sk)->core.sysctl_optmem_max) - 4) 230 return -ENOBUFS; 231 232 p = kmalloc(optlen + 4, GFP_KERNEL); 233 if (!p) 234 return -ENOMEM; 235 236 gf32 = p + 4; /* we want ->gf_group and ->gf_slist_flex aligned */ 237 ret = -EFAULT; 238 if (copy_from_sockptr(gf32, optval, optlen)) 239 goto out_free_p; 240 241 /* numsrc >= (4G-140)/128 overflow in 32 bits */ 242 ret = -ENOBUFS; 243 n = gf32->gf_numsrc; 244 if (n >= 0x1ffffffU || n > sysctl_mld_max_msf) 245 goto out_free_p; 246 247 ret = -EINVAL; 248 if (offsetof(struct compat_group_filter, gf_slist_flex[n]) > optlen) 249 goto out_free_p; 250 251 ret = ip6_mc_msfilter(sk, &(struct group_filter){ 252 .gf_interface = gf32->gf_interface, 253 .gf_group = gf32->gf_group, 254 .gf_fmode = gf32->gf_fmode, 255 .gf_numsrc = gf32->gf_numsrc}, gf32->gf_slist_flex); 256 257 out_free_p: 258 kfree(p); 259 return ret; 260 } 261 262 static int ipv6_mcast_join_leave(struct sock *sk, int optname, 263 sockptr_t optval, int optlen) 264 { 265 struct sockaddr_in6 *psin6; 266 struct group_req greq; 267 268 if (optlen < sizeof(greq)) 269 return -EINVAL; 270 if (copy_from_sockptr(&greq, optval, sizeof(greq))) 271 return -EFAULT; 272 273 if (greq.gr_group.ss_family != AF_INET6) 274 return -EADDRNOTAVAIL; 275 psin6 = (struct sockaddr_in6 *)&greq.gr_group; 276 if (optname == MCAST_JOIN_GROUP) 277 return ipv6_sock_mc_join(sk, greq.gr_interface, 278 &psin6->sin6_addr); 279 return ipv6_sock_mc_drop(sk, greq.gr_interface, &psin6->sin6_addr); 280 } 281 282 static int compat_ipv6_mcast_join_leave(struct sock *sk, int optname, 283 sockptr_t optval, int optlen) 284 { 285 struct compat_group_req gr32; 286 struct sockaddr_in6 *psin6; 287 288 if (optlen < sizeof(gr32)) 289 return -EINVAL; 290 if (copy_from_sockptr(&gr32, optval, sizeof(gr32))) 291 return -EFAULT; 292 293 if (gr32.gr_group.ss_family != AF_INET6) 294 return -EADDRNOTAVAIL; 295 psin6 = (struct sockaddr_in6 *)&gr32.gr_group; 296 if (optname == MCAST_JOIN_GROUP) 297 return ipv6_sock_mc_join(sk, gr32.gr_interface, 298 &psin6->sin6_addr); 299 return ipv6_sock_mc_drop(sk, gr32.gr_interface, &psin6->sin6_addr); 300 } 301 302 static int ipv6_set_opt_hdr(struct sock *sk, int optname, sockptr_t optval, 303 int optlen) 304 { 305 struct ipv6_pinfo *np = inet6_sk(sk); 306 struct ipv6_opt_hdr *new = NULL; 307 struct net *net = sock_net(sk); 308 struct ipv6_txoptions *opt; 309 int err; 310 311 /* hop-by-hop / destination options are privileged option */ 312 if (optname != IPV6_RTHDR && !sockopt_ns_capable(net->user_ns, CAP_NET_RAW)) 313 return -EPERM; 314 315 /* remove any sticky options header with a zero option 316 * length, per RFC3542. 317 */ 318 if (optlen > 0) { 319 if (sockptr_is_null(optval)) 320 return -EINVAL; 321 if (optlen < sizeof(struct ipv6_opt_hdr) || 322 optlen & 0x7 || 323 optlen > 8 * 255) 324 return -EINVAL; 325 326 new = memdup_sockptr(optval, optlen); 327 if (IS_ERR(new)) 328 return PTR_ERR(new); 329 if (unlikely(ipv6_optlen(new) > optlen)) { 330 kfree(new); 331 return -EINVAL; 332 } 333 } 334 335 opt = rcu_dereference_protected(np->opt, lockdep_sock_is_held(sk)); 336 opt = ipv6_renew_options(sk, opt, optname, new); 337 kfree(new); 338 if (IS_ERR(opt)) 339 return PTR_ERR(opt); 340 341 /* routing header option needs extra check */ 342 err = -EINVAL; 343 if (optname == IPV6_RTHDR && opt && opt->srcrt) { 344 struct ipv6_rt_hdr *rthdr = opt->srcrt; 345 switch (rthdr->type) { 346 #if IS_ENABLED(CONFIG_IPV6_MIP6) 347 case IPV6_SRCRT_TYPE_2: 348 if (rthdr->hdrlen != 2 || rthdr->segments_left != 1) 349 goto sticky_done; 350 break; 351 #endif 352 case IPV6_SRCRT_TYPE_4: 353 { 354 struct ipv6_sr_hdr *srh = 355 (struct ipv6_sr_hdr *)opt->srcrt; 356 357 if (!seg6_validate_srh(srh, optlen, false)) 358 goto sticky_done; 359 break; 360 } 361 default: 362 goto sticky_done; 363 } 364 } 365 366 err = 0; 367 opt = ipv6_update_options(sk, opt); 368 sticky_done: 369 if (opt) { 370 atomic_sub(opt->tot_len, &sk->sk_omem_alloc); 371 txopt_put(opt); 372 } 373 return err; 374 } 375 376 int do_ipv6_setsockopt(struct sock *sk, int level, int optname, 377 sockptr_t optval, unsigned int optlen) 378 { 379 struct ipv6_pinfo *np = inet6_sk(sk); 380 struct net *net = sock_net(sk); 381 int retv = -ENOPROTOOPT; 382 int val, valbool; 383 384 if (sockptr_is_null(optval)) 385 val = 0; 386 else { 387 if (optlen >= sizeof(int)) { 388 if (copy_from_sockptr(&val, optval, sizeof(val))) 389 return -EFAULT; 390 } else 391 val = 0; 392 } 393 394 valbool = (val != 0); 395 396 if (ip6_mroute_opt(optname)) 397 return ip6_mroute_setsockopt(sk, optname, optval, optlen); 398 399 /* Handle options that can be set without locking the socket. */ 400 switch (optname) { 401 case IPV6_UNICAST_HOPS: 402 if (optlen < sizeof(int)) 403 return -EINVAL; 404 if (val > 255 || val < -1) 405 return -EINVAL; 406 WRITE_ONCE(np->hop_limit, val); 407 return 0; 408 case IPV6_MULTICAST_LOOP: 409 if (optlen < sizeof(int)) 410 return -EINVAL; 411 if (val != valbool) 412 return -EINVAL; 413 inet6_assign_bit(MC6_LOOP, sk, valbool); 414 return 0; 415 case IPV6_MULTICAST_HOPS: 416 if (sk->sk_type == SOCK_STREAM) 417 return retv; 418 if (optlen < sizeof(int)) 419 return -EINVAL; 420 if (val > 255 || val < -1) 421 return -EINVAL; 422 WRITE_ONCE(np->mcast_hops, 423 val == -1 ? IPV6_DEFAULT_MCASTHOPS : val); 424 return 0; 425 case IPV6_MTU: 426 if (optlen < sizeof(int)) 427 return -EINVAL; 428 if (val && val < IPV6_MIN_MTU) 429 return -EINVAL; 430 WRITE_ONCE(np->frag_size, val); 431 return 0; 432 case IPV6_MINHOPCOUNT: 433 if (optlen < sizeof(int)) 434 return -EINVAL; 435 if (val < 0 || val > 255) 436 return -EINVAL; 437 438 if (val) 439 static_branch_enable(&ip6_min_hopcount); 440 441 /* tcp_v6_err() and tcp_v6_rcv() might read min_hopcount 442 * while we are changing it. 443 */ 444 WRITE_ONCE(np->min_hopcount, val); 445 return 0; 446 case IPV6_RECVERR_RFC4884: 447 if (optlen < sizeof(int)) 448 return -EINVAL; 449 if (val < 0 || val > 1) 450 return -EINVAL; 451 inet6_assign_bit(RECVERR6_RFC4884, sk, valbool); 452 return 0; 453 case IPV6_MULTICAST_ALL: 454 if (optlen < sizeof(int)) 455 return -EINVAL; 456 inet6_assign_bit(MC6_ALL, sk, valbool); 457 return 0; 458 case IPV6_AUTOFLOWLABEL: 459 inet6_assign_bit(AUTOFLOWLABEL, sk, valbool); 460 inet6_set_bit(AUTOFLOWLABEL_SET, sk); 461 return 0; 462 case IPV6_DONTFRAG: 463 inet6_assign_bit(DONTFRAG, sk, valbool); 464 return 0; 465 case IPV6_RECVERR: 466 if (optlen < sizeof(int)) 467 return -EINVAL; 468 inet6_assign_bit(RECVERR6, sk, valbool); 469 if (!val) 470 skb_errqueue_purge(&sk->sk_error_queue); 471 return 0; 472 case IPV6_ROUTER_ALERT_ISOLATE: 473 if (optlen < sizeof(int)) 474 return -EINVAL; 475 inet6_assign_bit(RTALERT_ISOLATE, sk, valbool); 476 return 0; 477 case IPV6_MTU_DISCOVER: 478 if (optlen < sizeof(int)) 479 return -EINVAL; 480 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT) 481 return -EINVAL; 482 WRITE_ONCE(np->pmtudisc, val); 483 return 0; 484 case IPV6_FLOWINFO_SEND: 485 if (optlen < sizeof(int)) 486 return -EINVAL; 487 inet6_assign_bit(SNDFLOW, sk, valbool); 488 return 0; 489 case IPV6_ADDR_PREFERENCES: 490 if (optlen < sizeof(int)) 491 return -EINVAL; 492 return ip6_sock_set_addr_preferences(sk, val); 493 case IPV6_MULTICAST_IF: 494 if (sk->sk_type == SOCK_STREAM) 495 return -ENOPROTOOPT; 496 if (optlen < sizeof(int)) 497 return -EINVAL; 498 if (val) { 499 struct net_device *dev; 500 int bound_dev_if, midx; 501 502 rcu_read_lock(); 503 504 dev = dev_get_by_index_rcu(net, val); 505 if (!dev) { 506 rcu_read_unlock(); 507 return -ENODEV; 508 } 509 midx = l3mdev_master_ifindex_rcu(dev); 510 511 rcu_read_unlock(); 512 513 bound_dev_if = READ_ONCE(sk->sk_bound_dev_if); 514 if (bound_dev_if && 515 bound_dev_if != val && 516 (!midx || midx != bound_dev_if)) 517 return -EINVAL; 518 } 519 WRITE_ONCE(np->mcast_oif, val); 520 return 0; 521 case IPV6_UNICAST_IF: 522 { 523 struct net_device *dev; 524 int ifindex; 525 526 if (optlen != sizeof(int)) 527 return -EINVAL; 528 529 ifindex = (__force int)ntohl((__force __be32)val); 530 if (!ifindex) { 531 WRITE_ONCE(np->ucast_oif, 0); 532 return 0; 533 } 534 535 dev = dev_get_by_index(net, ifindex); 536 if (!dev) 537 return -EADDRNOTAVAIL; 538 dev_put(dev); 539 540 if (READ_ONCE(sk->sk_bound_dev_if)) 541 return -EINVAL; 542 543 WRITE_ONCE(np->ucast_oif, ifindex); 544 return 0; 545 } 546 } 547 548 sockopt_lock_sock(sk); 549 550 /* Another thread has converted the socket into IPv4 with 551 * IPV6_ADDRFORM concurrently. 552 */ 553 if (unlikely(sk->sk_family != AF_INET6)) 554 goto unlock; 555 556 switch (optname) { 557 558 case IPV6_ADDRFORM: 559 if (optlen < sizeof(int)) 560 goto e_inval; 561 if (val == PF_INET) { 562 if (sk->sk_type == SOCK_RAW) 563 break; 564 565 if (sk->sk_protocol == IPPROTO_UDP) { 566 if (udp_sk(sk)->pending == AF_INET6) { 567 retv = -EBUSY; 568 break; 569 } 570 } else if (sk->sk_protocol == IPPROTO_TCP) { 571 if (sk->sk_prot != &tcpv6_prot) { 572 retv = -EBUSY; 573 break; 574 } 575 } else { 576 break; 577 } 578 579 if (sk->sk_state != TCP_ESTABLISHED) { 580 retv = -ENOTCONN; 581 break; 582 } 583 584 if (ipv6_only_sock(sk) || 585 !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) { 586 retv = -EADDRNOTAVAIL; 587 break; 588 } 589 590 __ipv6_sock_mc_close(sk); 591 __ipv6_sock_ac_close(sk); 592 593 if (sk->sk_protocol == IPPROTO_TCP) { 594 struct inet_connection_sock *icsk = inet_csk(sk); 595 596 sock_prot_inuse_add(net, sk->sk_prot, -1); 597 sock_prot_inuse_add(net, &tcp_prot, 1); 598 599 /* Paired with READ_ONCE(sk->sk_prot) in inet6_stream_ops */ 600 WRITE_ONCE(sk->sk_prot, &tcp_prot); 601 /* Paired with READ_ONCE() in tcp_(get|set)sockopt() */ 602 WRITE_ONCE(icsk->icsk_af_ops, &ipv4_specific); 603 WRITE_ONCE(sk->sk_socket->ops, &inet_stream_ops); 604 WRITE_ONCE(sk->sk_family, PF_INET); 605 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie); 606 } else { 607 sock_prot_inuse_add(net, sk->sk_prot, -1); 608 sock_prot_inuse_add(net, &udp_prot, 1); 609 610 /* Paired with READ_ONCE(sk->sk_prot) in inet6_dgram_ops */ 611 WRITE_ONCE(sk->sk_prot, &udp_prot); 612 WRITE_ONCE(sk->sk_socket->ops, &inet_dgram_ops); 613 WRITE_ONCE(sk->sk_family, PF_INET); 614 } 615 616 /* Disable all options not to allocate memory anymore, 617 * but there is still a race. See the lockless path 618 * in udpv6_sendmsg() and ipv6_local_rxpmtu(). 619 */ 620 np->rxopt.all = 0; 621 622 inet6_cleanup_sock(sk); 623 624 module_put(THIS_MODULE); 625 retv = 0; 626 break; 627 } 628 goto e_inval; 629 630 case IPV6_V6ONLY: 631 if (optlen < sizeof(int) || 632 inet_sk(sk)->inet_num) 633 goto e_inval; 634 sk->sk_ipv6only = valbool; 635 retv = 0; 636 break; 637 638 case IPV6_RECVPKTINFO: 639 if (optlen < sizeof(int)) 640 goto e_inval; 641 np->rxopt.bits.rxinfo = valbool; 642 retv = 0; 643 break; 644 645 case IPV6_2292PKTINFO: 646 if (optlen < sizeof(int)) 647 goto e_inval; 648 np->rxopt.bits.rxoinfo = valbool; 649 retv = 0; 650 break; 651 652 case IPV6_RECVHOPLIMIT: 653 if (optlen < sizeof(int)) 654 goto e_inval; 655 np->rxopt.bits.rxhlim = valbool; 656 retv = 0; 657 break; 658 659 case IPV6_2292HOPLIMIT: 660 if (optlen < sizeof(int)) 661 goto e_inval; 662 np->rxopt.bits.rxohlim = valbool; 663 retv = 0; 664 break; 665 666 case IPV6_RECVRTHDR: 667 if (optlen < sizeof(int)) 668 goto e_inval; 669 np->rxopt.bits.srcrt = valbool; 670 retv = 0; 671 break; 672 673 case IPV6_2292RTHDR: 674 if (optlen < sizeof(int)) 675 goto e_inval; 676 np->rxopt.bits.osrcrt = valbool; 677 retv = 0; 678 break; 679 680 case IPV6_RECVHOPOPTS: 681 if (optlen < sizeof(int)) 682 goto e_inval; 683 np->rxopt.bits.hopopts = valbool; 684 retv = 0; 685 break; 686 687 case IPV6_2292HOPOPTS: 688 if (optlen < sizeof(int)) 689 goto e_inval; 690 np->rxopt.bits.ohopopts = valbool; 691 retv = 0; 692 break; 693 694 case IPV6_RECVDSTOPTS: 695 if (optlen < sizeof(int)) 696 goto e_inval; 697 np->rxopt.bits.dstopts = valbool; 698 retv = 0; 699 break; 700 701 case IPV6_2292DSTOPTS: 702 if (optlen < sizeof(int)) 703 goto e_inval; 704 np->rxopt.bits.odstopts = valbool; 705 retv = 0; 706 break; 707 708 case IPV6_TCLASS: 709 if (optlen < sizeof(int)) 710 goto e_inval; 711 if (val < -1 || val > 0xff) 712 goto e_inval; 713 /* RFC 3542, 6.5: default traffic class of 0x0 */ 714 if (val == -1) 715 val = 0; 716 if (sk->sk_type == SOCK_STREAM) { 717 val &= ~INET_ECN_MASK; 718 val |= np->tclass & INET_ECN_MASK; 719 } 720 if (np->tclass != val) { 721 np->tclass = val; 722 sk_dst_reset(sk); 723 } 724 retv = 0; 725 break; 726 727 case IPV6_RECVTCLASS: 728 if (optlen < sizeof(int)) 729 goto e_inval; 730 np->rxopt.bits.rxtclass = valbool; 731 retv = 0; 732 break; 733 734 case IPV6_FLOWINFO: 735 if (optlen < sizeof(int)) 736 goto e_inval; 737 np->rxopt.bits.rxflow = valbool; 738 retv = 0; 739 break; 740 741 case IPV6_RECVPATHMTU: 742 if (optlen < sizeof(int)) 743 goto e_inval; 744 np->rxopt.bits.rxpmtu = valbool; 745 retv = 0; 746 break; 747 748 case IPV6_TRANSPARENT: 749 if (valbool && !sockopt_ns_capable(net->user_ns, CAP_NET_RAW) && 750 !sockopt_ns_capable(net->user_ns, CAP_NET_ADMIN)) { 751 retv = -EPERM; 752 break; 753 } 754 if (optlen < sizeof(int)) 755 goto e_inval; 756 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */ 757 inet_assign_bit(TRANSPARENT, sk, valbool); 758 retv = 0; 759 break; 760 761 case IPV6_FREEBIND: 762 if (optlen < sizeof(int)) 763 goto e_inval; 764 /* we also don't have a separate freebind bit for IPV6 */ 765 inet_assign_bit(FREEBIND, sk, valbool); 766 retv = 0; 767 break; 768 769 case IPV6_RECVORIGDSTADDR: 770 if (optlen < sizeof(int)) 771 goto e_inval; 772 np->rxopt.bits.rxorigdstaddr = valbool; 773 retv = 0; 774 break; 775 776 case IPV6_HOPOPTS: 777 case IPV6_RTHDRDSTOPTS: 778 case IPV6_RTHDR: 779 case IPV6_DSTOPTS: 780 retv = ipv6_set_opt_hdr(sk, optname, optval, optlen); 781 break; 782 783 case IPV6_PKTINFO: 784 { 785 struct in6_pktinfo pkt; 786 787 if (optlen == 0) 788 goto e_inval; 789 else if (optlen < sizeof(struct in6_pktinfo) || 790 sockptr_is_null(optval)) 791 goto e_inval; 792 793 if (copy_from_sockptr(&pkt, optval, sizeof(pkt))) { 794 retv = -EFAULT; 795 break; 796 } 797 if (!sk_dev_equal_l3scope(sk, pkt.ipi6_ifindex)) 798 goto e_inval; 799 800 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex; 801 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr; 802 retv = 0; 803 break; 804 } 805 806 case IPV6_2292PKTOPTIONS: 807 { 808 struct ipv6_txoptions *opt = NULL; 809 struct msghdr msg; 810 struct flowi6 fl6; 811 struct ipcm6_cookie ipc6; 812 813 memset(&fl6, 0, sizeof(fl6)); 814 fl6.flowi6_oif = sk->sk_bound_dev_if; 815 fl6.flowi6_mark = sk->sk_mark; 816 817 if (optlen == 0) 818 goto update; 819 820 /* 1K is probably excessive 821 * 1K is surely not enough, 2K per standard header is 16K. 822 */ 823 retv = -EINVAL; 824 if (optlen > 64*1024) 825 break; 826 827 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL); 828 retv = -ENOBUFS; 829 if (!opt) 830 break; 831 832 memset(opt, 0, sizeof(*opt)); 833 refcount_set(&opt->refcnt, 1); 834 opt->tot_len = sizeof(*opt) + optlen; 835 retv = -EFAULT; 836 if (copy_from_sockptr(opt + 1, optval, optlen)) 837 goto done; 838 839 msg.msg_controllen = optlen; 840 msg.msg_control_is_user = false; 841 msg.msg_control = (void *)(opt+1); 842 ipc6.opt = opt; 843 844 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6); 845 if (retv) 846 goto done; 847 update: 848 retv = 0; 849 opt = ipv6_update_options(sk, opt); 850 done: 851 if (opt) { 852 atomic_sub(opt->tot_len, &sk->sk_omem_alloc); 853 txopt_put(opt); 854 } 855 break; 856 } 857 858 case IPV6_ADD_MEMBERSHIP: 859 case IPV6_DROP_MEMBERSHIP: 860 { 861 struct ipv6_mreq mreq; 862 863 if (optlen < sizeof(struct ipv6_mreq)) 864 goto e_inval; 865 866 retv = -EPROTO; 867 if (inet_test_bit(IS_ICSK, sk)) 868 break; 869 870 retv = -EFAULT; 871 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq))) 872 break; 873 874 if (optname == IPV6_ADD_MEMBERSHIP) 875 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr); 876 else 877 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr); 878 break; 879 } 880 case IPV6_JOIN_ANYCAST: 881 case IPV6_LEAVE_ANYCAST: 882 { 883 struct ipv6_mreq mreq; 884 885 if (optlen < sizeof(struct ipv6_mreq)) 886 goto e_inval; 887 888 retv = -EFAULT; 889 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq))) 890 break; 891 892 if (optname == IPV6_JOIN_ANYCAST) 893 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr); 894 else 895 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr); 896 break; 897 } 898 case MCAST_JOIN_GROUP: 899 case MCAST_LEAVE_GROUP: 900 if (in_compat_syscall()) 901 retv = compat_ipv6_mcast_join_leave(sk, optname, optval, 902 optlen); 903 else 904 retv = ipv6_mcast_join_leave(sk, optname, optval, 905 optlen); 906 break; 907 case MCAST_JOIN_SOURCE_GROUP: 908 case MCAST_LEAVE_SOURCE_GROUP: 909 case MCAST_BLOCK_SOURCE: 910 case MCAST_UNBLOCK_SOURCE: 911 retv = do_ipv6_mcast_group_source(sk, optname, optval, optlen); 912 break; 913 case MCAST_MSFILTER: 914 if (in_compat_syscall()) 915 retv = compat_ipv6_set_mcast_msfilter(sk, optval, 916 optlen); 917 else 918 retv = ipv6_set_mcast_msfilter(sk, optval, optlen); 919 break; 920 case IPV6_ROUTER_ALERT: 921 if (optlen < sizeof(int)) 922 goto e_inval; 923 retv = ip6_ra_control(sk, val); 924 if (retv == 0) 925 inet6_assign_bit(RTALERT, sk, valbool); 926 break; 927 case IPV6_FLOWLABEL_MGR: 928 retv = ipv6_flowlabel_opt(sk, optval, optlen); 929 break; 930 case IPV6_IPSEC_POLICY: 931 case IPV6_XFRM_POLICY: 932 retv = -EPERM; 933 if (!sockopt_ns_capable(net->user_ns, CAP_NET_ADMIN)) 934 break; 935 retv = xfrm_user_policy(sk, optname, optval, optlen); 936 break; 937 938 case IPV6_RECVFRAGSIZE: 939 np->rxopt.bits.recvfragsize = valbool; 940 retv = 0; 941 break; 942 } 943 944 unlock: 945 sockopt_release_sock(sk); 946 947 return retv; 948 949 e_inval: 950 retv = -EINVAL; 951 goto unlock; 952 } 953 954 int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, 955 unsigned int optlen) 956 { 957 int err; 958 959 if (level == SOL_IP && sk->sk_type != SOCK_RAW) 960 return ip_setsockopt(sk, level, optname, optval, optlen); 961 962 if (level != SOL_IPV6) 963 return -ENOPROTOOPT; 964 965 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen); 966 #ifdef CONFIG_NETFILTER 967 /* we need to exclude all possible ENOPROTOOPTs except default case */ 968 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY && 969 optname != IPV6_XFRM_POLICY) 970 err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen); 971 #endif 972 return err; 973 } 974 EXPORT_SYMBOL(ipv6_setsockopt); 975 976 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt, 977 int optname, sockptr_t optval, int len) 978 { 979 struct ipv6_opt_hdr *hdr; 980 981 if (!opt) 982 return 0; 983 984 switch (optname) { 985 case IPV6_HOPOPTS: 986 hdr = opt->hopopt; 987 break; 988 case IPV6_RTHDRDSTOPTS: 989 hdr = opt->dst0opt; 990 break; 991 case IPV6_RTHDR: 992 hdr = (struct ipv6_opt_hdr *)opt->srcrt; 993 break; 994 case IPV6_DSTOPTS: 995 hdr = opt->dst1opt; 996 break; 997 default: 998 return -EINVAL; /* should not happen */ 999 } 1000 1001 if (!hdr) 1002 return 0; 1003 1004 len = min_t(unsigned int, len, ipv6_optlen(hdr)); 1005 if (copy_to_sockptr(optval, hdr, len)) 1006 return -EFAULT; 1007 return len; 1008 } 1009 1010 static int ipv6_get_msfilter(struct sock *sk, sockptr_t optval, 1011 sockptr_t optlen, int len) 1012 { 1013 const int size0 = offsetof(struct group_filter, gf_slist_flex); 1014 struct group_filter gsf; 1015 int num; 1016 int err; 1017 1018 if (len < size0) 1019 return -EINVAL; 1020 if (copy_from_sockptr(&gsf, optval, size0)) 1021 return -EFAULT; 1022 if (gsf.gf_group.ss_family != AF_INET6) 1023 return -EADDRNOTAVAIL; 1024 num = gsf.gf_numsrc; 1025 sockopt_lock_sock(sk); 1026 err = ip6_mc_msfget(sk, &gsf, optval, size0); 1027 if (!err) { 1028 if (num > gsf.gf_numsrc) 1029 num = gsf.gf_numsrc; 1030 len = GROUP_FILTER_SIZE(num); 1031 if (copy_to_sockptr(optlen, &len, sizeof(int)) || 1032 copy_to_sockptr(optval, &gsf, size0)) 1033 err = -EFAULT; 1034 } 1035 sockopt_release_sock(sk); 1036 return err; 1037 } 1038 1039 static int compat_ipv6_get_msfilter(struct sock *sk, sockptr_t optval, 1040 sockptr_t optlen, int len) 1041 { 1042 const int size0 = offsetof(struct compat_group_filter, gf_slist_flex); 1043 struct compat_group_filter gf32; 1044 struct group_filter gf; 1045 int err; 1046 int num; 1047 1048 if (len < size0) 1049 return -EINVAL; 1050 1051 if (copy_from_sockptr(&gf32, optval, size0)) 1052 return -EFAULT; 1053 gf.gf_interface = gf32.gf_interface; 1054 gf.gf_fmode = gf32.gf_fmode; 1055 num = gf.gf_numsrc = gf32.gf_numsrc; 1056 gf.gf_group = gf32.gf_group; 1057 1058 if (gf.gf_group.ss_family != AF_INET6) 1059 return -EADDRNOTAVAIL; 1060 1061 sockopt_lock_sock(sk); 1062 err = ip6_mc_msfget(sk, &gf, optval, size0); 1063 sockopt_release_sock(sk); 1064 if (err) 1065 return err; 1066 if (num > gf.gf_numsrc) 1067 num = gf.gf_numsrc; 1068 len = GROUP_FILTER_SIZE(num) - (sizeof(gf)-sizeof(gf32)); 1069 if (copy_to_sockptr(optlen, &len, sizeof(int)) || 1070 copy_to_sockptr_offset(optval, offsetof(struct compat_group_filter, gf_fmode), 1071 &gf.gf_fmode, sizeof(gf32.gf_fmode)) || 1072 copy_to_sockptr_offset(optval, offsetof(struct compat_group_filter, gf_numsrc), 1073 &gf.gf_numsrc, sizeof(gf32.gf_numsrc))) 1074 return -EFAULT; 1075 return 0; 1076 } 1077 1078 int do_ipv6_getsockopt(struct sock *sk, int level, int optname, 1079 sockptr_t optval, sockptr_t optlen) 1080 { 1081 struct ipv6_pinfo *np = inet6_sk(sk); 1082 int len; 1083 int val; 1084 1085 if (ip6_mroute_opt(optname)) 1086 return ip6_mroute_getsockopt(sk, optname, optval, optlen); 1087 1088 if (copy_from_sockptr(&len, optlen, sizeof(int))) 1089 return -EFAULT; 1090 switch (optname) { 1091 case IPV6_ADDRFORM: 1092 if (sk->sk_protocol != IPPROTO_UDP && 1093 sk->sk_protocol != IPPROTO_TCP) 1094 return -ENOPROTOOPT; 1095 if (sk->sk_state != TCP_ESTABLISHED) 1096 return -ENOTCONN; 1097 val = sk->sk_family; 1098 break; 1099 case MCAST_MSFILTER: 1100 if (in_compat_syscall()) 1101 return compat_ipv6_get_msfilter(sk, optval, optlen, len); 1102 return ipv6_get_msfilter(sk, optval, optlen, len); 1103 case IPV6_2292PKTOPTIONS: 1104 { 1105 struct msghdr msg; 1106 struct sk_buff *skb; 1107 1108 if (sk->sk_type != SOCK_STREAM) 1109 return -ENOPROTOOPT; 1110 1111 if (optval.is_kernel) { 1112 msg.msg_control_is_user = false; 1113 msg.msg_control = optval.kernel; 1114 } else { 1115 msg.msg_control_is_user = true; 1116 msg.msg_control_user = optval.user; 1117 } 1118 msg.msg_controllen = len; 1119 msg.msg_flags = 0; 1120 1121 sockopt_lock_sock(sk); 1122 skb = np->pktoptions; 1123 if (skb) 1124 ip6_datagram_recv_ctl(sk, &msg, skb); 1125 sockopt_release_sock(sk); 1126 if (!skb) { 1127 if (np->rxopt.bits.rxinfo) { 1128 int mcast_oif = READ_ONCE(np->mcast_oif); 1129 struct in6_pktinfo src_info; 1130 1131 src_info.ipi6_ifindex = mcast_oif ? : 1132 np->sticky_pktinfo.ipi6_ifindex; 1133 src_info.ipi6_addr = mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr; 1134 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info); 1135 } 1136 if (np->rxopt.bits.rxhlim) { 1137 int hlim = READ_ONCE(np->mcast_hops); 1138 1139 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); 1140 } 1141 if (np->rxopt.bits.rxtclass) { 1142 int tclass = (int)ip6_tclass(np->rcv_flowinfo); 1143 1144 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass); 1145 } 1146 if (np->rxopt.bits.rxoinfo) { 1147 int mcast_oif = READ_ONCE(np->mcast_oif); 1148 struct in6_pktinfo src_info; 1149 1150 src_info.ipi6_ifindex = mcast_oif ? : 1151 np->sticky_pktinfo.ipi6_ifindex; 1152 src_info.ipi6_addr = mcast_oif ? sk->sk_v6_daddr : 1153 np->sticky_pktinfo.ipi6_addr; 1154 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); 1155 } 1156 if (np->rxopt.bits.rxohlim) { 1157 int hlim = READ_ONCE(np->mcast_hops); 1158 1159 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); 1160 } 1161 if (np->rxopt.bits.rxflow) { 1162 __be32 flowinfo = np->rcv_flowinfo; 1163 1164 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo); 1165 } 1166 } 1167 len -= msg.msg_controllen; 1168 return copy_to_sockptr(optlen, &len, sizeof(int)); 1169 } 1170 case IPV6_MTU: 1171 { 1172 struct dst_entry *dst; 1173 1174 val = 0; 1175 rcu_read_lock(); 1176 dst = __sk_dst_get(sk); 1177 if (dst) 1178 val = dst6_mtu(dst); 1179 rcu_read_unlock(); 1180 if (!val) 1181 return -ENOTCONN; 1182 break; 1183 } 1184 1185 case IPV6_V6ONLY: 1186 val = sk->sk_ipv6only; 1187 break; 1188 1189 case IPV6_RECVPKTINFO: 1190 val = np->rxopt.bits.rxinfo; 1191 break; 1192 1193 case IPV6_2292PKTINFO: 1194 val = np->rxopt.bits.rxoinfo; 1195 break; 1196 1197 case IPV6_RECVHOPLIMIT: 1198 val = np->rxopt.bits.rxhlim; 1199 break; 1200 1201 case IPV6_2292HOPLIMIT: 1202 val = np->rxopt.bits.rxohlim; 1203 break; 1204 1205 case IPV6_RECVRTHDR: 1206 val = np->rxopt.bits.srcrt; 1207 break; 1208 1209 case IPV6_2292RTHDR: 1210 val = np->rxopt.bits.osrcrt; 1211 break; 1212 1213 case IPV6_HOPOPTS: 1214 case IPV6_RTHDRDSTOPTS: 1215 case IPV6_RTHDR: 1216 case IPV6_DSTOPTS: 1217 { 1218 struct ipv6_txoptions *opt; 1219 1220 sockopt_lock_sock(sk); 1221 opt = rcu_dereference_protected(np->opt, 1222 lockdep_sock_is_held(sk)); 1223 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len); 1224 sockopt_release_sock(sk); 1225 /* check if ipv6_getsockopt_sticky() returns err code */ 1226 if (len < 0) 1227 return len; 1228 return copy_to_sockptr(optlen, &len, sizeof(int)); 1229 } 1230 1231 case IPV6_RECVHOPOPTS: 1232 val = np->rxopt.bits.hopopts; 1233 break; 1234 1235 case IPV6_2292HOPOPTS: 1236 val = np->rxopt.bits.ohopopts; 1237 break; 1238 1239 case IPV6_RECVDSTOPTS: 1240 val = np->rxopt.bits.dstopts; 1241 break; 1242 1243 case IPV6_2292DSTOPTS: 1244 val = np->rxopt.bits.odstopts; 1245 break; 1246 1247 case IPV6_TCLASS: 1248 val = np->tclass; 1249 break; 1250 1251 case IPV6_RECVTCLASS: 1252 val = np->rxopt.bits.rxtclass; 1253 break; 1254 1255 case IPV6_FLOWINFO: 1256 val = np->rxopt.bits.rxflow; 1257 break; 1258 1259 case IPV6_RECVPATHMTU: 1260 val = np->rxopt.bits.rxpmtu; 1261 break; 1262 1263 case IPV6_PATHMTU: 1264 { 1265 struct dst_entry *dst; 1266 struct ip6_mtuinfo mtuinfo; 1267 1268 if (len < sizeof(mtuinfo)) 1269 return -EINVAL; 1270 1271 len = sizeof(mtuinfo); 1272 memset(&mtuinfo, 0, sizeof(mtuinfo)); 1273 1274 rcu_read_lock(); 1275 dst = __sk_dst_get(sk); 1276 if (dst) 1277 mtuinfo.ip6m_mtu = dst6_mtu(dst); 1278 rcu_read_unlock(); 1279 if (!mtuinfo.ip6m_mtu) 1280 return -ENOTCONN; 1281 1282 if (copy_to_sockptr(optlen, &len, sizeof(int))) 1283 return -EFAULT; 1284 if (copy_to_sockptr(optval, &mtuinfo, len)) 1285 return -EFAULT; 1286 1287 return 0; 1288 } 1289 1290 case IPV6_TRANSPARENT: 1291 val = inet_test_bit(TRANSPARENT, sk); 1292 break; 1293 1294 case IPV6_FREEBIND: 1295 val = inet_test_bit(FREEBIND, sk); 1296 break; 1297 1298 case IPV6_RECVORIGDSTADDR: 1299 val = np->rxopt.bits.rxorigdstaddr; 1300 break; 1301 1302 case IPV6_UNICAST_HOPS: 1303 case IPV6_MULTICAST_HOPS: 1304 { 1305 struct dst_entry *dst; 1306 1307 if (optname == IPV6_UNICAST_HOPS) 1308 val = READ_ONCE(np->hop_limit); 1309 else 1310 val = READ_ONCE(np->mcast_hops); 1311 1312 if (val < 0) { 1313 rcu_read_lock(); 1314 dst = __sk_dst_get(sk); 1315 if (dst) 1316 val = ip6_dst_hoplimit(dst); 1317 rcu_read_unlock(); 1318 } 1319 1320 if (val < 0) 1321 val = READ_ONCE(sock_net(sk)->ipv6.devconf_all->hop_limit); 1322 break; 1323 } 1324 1325 case IPV6_MULTICAST_LOOP: 1326 val = inet6_test_bit(MC6_LOOP, sk); 1327 break; 1328 1329 case IPV6_MULTICAST_IF: 1330 val = READ_ONCE(np->mcast_oif); 1331 break; 1332 1333 case IPV6_MULTICAST_ALL: 1334 val = inet6_test_bit(MC6_ALL, sk); 1335 break; 1336 1337 case IPV6_UNICAST_IF: 1338 val = (__force int)htonl((__u32) READ_ONCE(np->ucast_oif)); 1339 break; 1340 1341 case IPV6_MTU_DISCOVER: 1342 val = READ_ONCE(np->pmtudisc); 1343 break; 1344 1345 case IPV6_RECVERR: 1346 val = inet6_test_bit(RECVERR6, sk); 1347 break; 1348 1349 case IPV6_FLOWINFO_SEND: 1350 val = inet6_test_bit(SNDFLOW, sk); 1351 break; 1352 1353 case IPV6_FLOWLABEL_MGR: 1354 { 1355 struct in6_flowlabel_req freq; 1356 int flags; 1357 1358 if (len < sizeof(freq)) 1359 return -EINVAL; 1360 1361 if (copy_from_sockptr(&freq, optval, sizeof(freq))) 1362 return -EFAULT; 1363 1364 if (freq.flr_action != IPV6_FL_A_GET) 1365 return -EINVAL; 1366 1367 len = sizeof(freq); 1368 flags = freq.flr_flags; 1369 1370 memset(&freq, 0, sizeof(freq)); 1371 1372 val = ipv6_flowlabel_opt_get(sk, &freq, flags); 1373 if (val < 0) 1374 return val; 1375 1376 if (copy_to_sockptr(optlen, &len, sizeof(int))) 1377 return -EFAULT; 1378 if (copy_to_sockptr(optval, &freq, len)) 1379 return -EFAULT; 1380 1381 return 0; 1382 } 1383 1384 case IPV6_ADDR_PREFERENCES: 1385 { 1386 u8 srcprefs = READ_ONCE(np->srcprefs); 1387 val = 0; 1388 1389 if (srcprefs & IPV6_PREFER_SRC_TMP) 1390 val |= IPV6_PREFER_SRC_TMP; 1391 else if (srcprefs & IPV6_PREFER_SRC_PUBLIC) 1392 val |= IPV6_PREFER_SRC_PUBLIC; 1393 else { 1394 /* XXX: should we return system default? */ 1395 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT; 1396 } 1397 1398 if (srcprefs & IPV6_PREFER_SRC_COA) 1399 val |= IPV6_PREFER_SRC_COA; 1400 else 1401 val |= IPV6_PREFER_SRC_HOME; 1402 break; 1403 } 1404 case IPV6_MINHOPCOUNT: 1405 val = READ_ONCE(np->min_hopcount); 1406 break; 1407 1408 case IPV6_DONTFRAG: 1409 val = inet6_test_bit(DONTFRAG, sk); 1410 break; 1411 1412 case IPV6_AUTOFLOWLABEL: 1413 val = ip6_autoflowlabel(sock_net(sk), sk); 1414 break; 1415 1416 case IPV6_RECVFRAGSIZE: 1417 val = np->rxopt.bits.recvfragsize; 1418 break; 1419 1420 case IPV6_ROUTER_ALERT: 1421 val = inet6_test_bit(RTALERT, sk); 1422 break; 1423 1424 case IPV6_ROUTER_ALERT_ISOLATE: 1425 val = inet6_test_bit(RTALERT_ISOLATE, sk); 1426 break; 1427 1428 case IPV6_RECVERR_RFC4884: 1429 val = inet6_test_bit(RECVERR6_RFC4884, sk); 1430 break; 1431 1432 default: 1433 return -ENOPROTOOPT; 1434 } 1435 len = min_t(unsigned int, sizeof(int), len); 1436 if (copy_to_sockptr(optlen, &len, sizeof(int))) 1437 return -EFAULT; 1438 if (copy_to_sockptr(optval, &val, len)) 1439 return -EFAULT; 1440 return 0; 1441 } 1442 1443 int ipv6_getsockopt(struct sock *sk, int level, int optname, 1444 char __user *optval, int __user *optlen) 1445 { 1446 int err; 1447 1448 if (level == SOL_IP && sk->sk_type != SOCK_RAW) 1449 return ip_getsockopt(sk, level, optname, optval, optlen); 1450 1451 if (level != SOL_IPV6) 1452 return -ENOPROTOOPT; 1453 1454 err = do_ipv6_getsockopt(sk, level, optname, 1455 USER_SOCKPTR(optval), USER_SOCKPTR(optlen)); 1456 #ifdef CONFIG_NETFILTER 1457 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1458 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) { 1459 int len; 1460 1461 if (get_user(len, optlen)) 1462 return -EFAULT; 1463 1464 err = nf_getsockopt(sk, PF_INET6, optname, optval, &len); 1465 if (err >= 0) 1466 err = put_user(len, optlen); 1467 } 1468 #endif 1469 return err; 1470 } 1471 EXPORT_SYMBOL(ipv6_getsockopt); 1472