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_sk(sk)->is_icsk) { 106 if (opt && 107 !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) && 108 inet_sk(sk)->inet_daddr != LOOPBACK4_IPV6) { 109 struct inet_connection_sock *icsk = inet_csk(sk); 110 icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen; 111 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie); 112 } 113 } 114 opt = xchg((__force struct ipv6_txoptions **)&inet6_sk(sk)->opt, 115 opt); 116 sk_dst_reset(sk); 117 118 return opt; 119 } 120 121 static bool setsockopt_needs_rtnl(int optname) 122 { 123 switch (optname) { 124 case IPV6_ADDRFORM: 125 case IPV6_ADD_MEMBERSHIP: 126 case IPV6_DROP_MEMBERSHIP: 127 case IPV6_JOIN_ANYCAST: 128 case IPV6_LEAVE_ANYCAST: 129 case MCAST_JOIN_GROUP: 130 case MCAST_LEAVE_GROUP: 131 case MCAST_JOIN_SOURCE_GROUP: 132 case MCAST_LEAVE_SOURCE_GROUP: 133 case MCAST_BLOCK_SOURCE: 134 case MCAST_UNBLOCK_SOURCE: 135 case MCAST_MSFILTER: 136 return true; 137 } 138 return false; 139 } 140 141 static int copy_group_source_from_sockptr(struct group_source_req *greqs, 142 sockptr_t optval, int optlen) 143 { 144 if (in_compat_syscall()) { 145 struct compat_group_source_req gr32; 146 147 if (optlen < sizeof(gr32)) 148 return -EINVAL; 149 if (copy_from_sockptr(&gr32, optval, sizeof(gr32))) 150 return -EFAULT; 151 greqs->gsr_interface = gr32.gsr_interface; 152 greqs->gsr_group = gr32.gsr_group; 153 greqs->gsr_source = gr32.gsr_source; 154 } else { 155 if (optlen < sizeof(*greqs)) 156 return -EINVAL; 157 if (copy_from_sockptr(greqs, optval, sizeof(*greqs))) 158 return -EFAULT; 159 } 160 161 return 0; 162 } 163 164 static int do_ipv6_mcast_group_source(struct sock *sk, int optname, 165 sockptr_t optval, int optlen) 166 { 167 struct group_source_req greqs; 168 int omode, add; 169 int ret; 170 171 ret = copy_group_source_from_sockptr(&greqs, optval, optlen); 172 if (ret) 173 return ret; 174 175 if (greqs.gsr_group.ss_family != AF_INET6 || 176 greqs.gsr_source.ss_family != AF_INET6) 177 return -EADDRNOTAVAIL; 178 179 if (optname == MCAST_BLOCK_SOURCE) { 180 omode = MCAST_EXCLUDE; 181 add = 1; 182 } else if (optname == MCAST_UNBLOCK_SOURCE) { 183 omode = MCAST_EXCLUDE; 184 add = 0; 185 } else if (optname == MCAST_JOIN_SOURCE_GROUP) { 186 struct sockaddr_in6 *psin6; 187 int retv; 188 189 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group; 190 retv = ipv6_sock_mc_join_ssm(sk, greqs.gsr_interface, 191 &psin6->sin6_addr, 192 MCAST_INCLUDE); 193 /* prior join w/ different source is ok */ 194 if (retv && retv != -EADDRINUSE) 195 return retv; 196 omode = MCAST_INCLUDE; 197 add = 1; 198 } else /* MCAST_LEAVE_SOURCE_GROUP */ { 199 omode = MCAST_INCLUDE; 200 add = 0; 201 } 202 return ip6_mc_source(add, omode, sk, &greqs); 203 } 204 205 static int ipv6_set_mcast_msfilter(struct sock *sk, sockptr_t optval, 206 int optlen) 207 { 208 struct group_filter *gsf; 209 int ret; 210 211 if (optlen < GROUP_FILTER_SIZE(0)) 212 return -EINVAL; 213 if (optlen > sysctl_optmem_max) 214 return -ENOBUFS; 215 216 gsf = memdup_sockptr(optval, optlen); 217 if (IS_ERR(gsf)) 218 return PTR_ERR(gsf); 219 220 /* numsrc >= (4G-140)/128 overflow in 32 bits */ 221 ret = -ENOBUFS; 222 if (gsf->gf_numsrc >= 0x1ffffffU || 223 gsf->gf_numsrc > sysctl_mld_max_msf) 224 goto out_free_gsf; 225 226 ret = -EINVAL; 227 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) 228 goto out_free_gsf; 229 230 ret = ip6_mc_msfilter(sk, gsf, gsf->gf_slist_flex); 231 out_free_gsf: 232 kfree(gsf); 233 return ret; 234 } 235 236 static int compat_ipv6_set_mcast_msfilter(struct sock *sk, sockptr_t optval, 237 int optlen) 238 { 239 const int size0 = offsetof(struct compat_group_filter, gf_slist_flex); 240 struct compat_group_filter *gf32; 241 void *p; 242 int ret; 243 int n; 244 245 if (optlen < size0) 246 return -EINVAL; 247 if (optlen > sysctl_optmem_max - 4) 248 return -ENOBUFS; 249 250 p = kmalloc(optlen + 4, GFP_KERNEL); 251 if (!p) 252 return -ENOMEM; 253 254 gf32 = p + 4; /* we want ->gf_group and ->gf_slist_flex aligned */ 255 ret = -EFAULT; 256 if (copy_from_sockptr(gf32, optval, optlen)) 257 goto out_free_p; 258 259 /* numsrc >= (4G-140)/128 overflow in 32 bits */ 260 ret = -ENOBUFS; 261 n = gf32->gf_numsrc; 262 if (n >= 0x1ffffffU || n > sysctl_mld_max_msf) 263 goto out_free_p; 264 265 ret = -EINVAL; 266 if (offsetof(struct compat_group_filter, gf_slist_flex[n]) > optlen) 267 goto out_free_p; 268 269 ret = ip6_mc_msfilter(sk, &(struct group_filter){ 270 .gf_interface = gf32->gf_interface, 271 .gf_group = gf32->gf_group, 272 .gf_fmode = gf32->gf_fmode, 273 .gf_numsrc = gf32->gf_numsrc}, gf32->gf_slist_flex); 274 275 out_free_p: 276 kfree(p); 277 return ret; 278 } 279 280 static int ipv6_mcast_join_leave(struct sock *sk, int optname, 281 sockptr_t optval, int optlen) 282 { 283 struct sockaddr_in6 *psin6; 284 struct group_req greq; 285 286 if (optlen < sizeof(greq)) 287 return -EINVAL; 288 if (copy_from_sockptr(&greq, optval, sizeof(greq))) 289 return -EFAULT; 290 291 if (greq.gr_group.ss_family != AF_INET6) 292 return -EADDRNOTAVAIL; 293 psin6 = (struct sockaddr_in6 *)&greq.gr_group; 294 if (optname == MCAST_JOIN_GROUP) 295 return ipv6_sock_mc_join(sk, greq.gr_interface, 296 &psin6->sin6_addr); 297 return ipv6_sock_mc_drop(sk, greq.gr_interface, &psin6->sin6_addr); 298 } 299 300 static int compat_ipv6_mcast_join_leave(struct sock *sk, int optname, 301 sockptr_t optval, int optlen) 302 { 303 struct compat_group_req gr32; 304 struct sockaddr_in6 *psin6; 305 306 if (optlen < sizeof(gr32)) 307 return -EINVAL; 308 if (copy_from_sockptr(&gr32, optval, sizeof(gr32))) 309 return -EFAULT; 310 311 if (gr32.gr_group.ss_family != AF_INET6) 312 return -EADDRNOTAVAIL; 313 psin6 = (struct sockaddr_in6 *)&gr32.gr_group; 314 if (optname == MCAST_JOIN_GROUP) 315 return ipv6_sock_mc_join(sk, gr32.gr_interface, 316 &psin6->sin6_addr); 317 return ipv6_sock_mc_drop(sk, gr32.gr_interface, &psin6->sin6_addr); 318 } 319 320 static int ipv6_set_opt_hdr(struct sock *sk, int optname, sockptr_t optval, 321 int optlen) 322 { 323 struct ipv6_pinfo *np = inet6_sk(sk); 324 struct ipv6_opt_hdr *new = NULL; 325 struct net *net = sock_net(sk); 326 struct ipv6_txoptions *opt; 327 int err; 328 329 /* hop-by-hop / destination options are privileged option */ 330 if (optname != IPV6_RTHDR && !sockopt_ns_capable(net->user_ns, CAP_NET_RAW)) 331 return -EPERM; 332 333 /* remove any sticky options header with a zero option 334 * length, per RFC3542. 335 */ 336 if (optlen > 0) { 337 if (sockptr_is_null(optval)) 338 return -EINVAL; 339 if (optlen < sizeof(struct ipv6_opt_hdr) || 340 optlen & 0x7 || 341 optlen > 8 * 255) 342 return -EINVAL; 343 344 new = memdup_sockptr(optval, optlen); 345 if (IS_ERR(new)) 346 return PTR_ERR(new); 347 if (unlikely(ipv6_optlen(new) > optlen)) { 348 kfree(new); 349 return -EINVAL; 350 } 351 } 352 353 opt = rcu_dereference_protected(np->opt, lockdep_sock_is_held(sk)); 354 opt = ipv6_renew_options(sk, opt, optname, new); 355 kfree(new); 356 if (IS_ERR(opt)) 357 return PTR_ERR(opt); 358 359 /* routing header option needs extra check */ 360 err = -EINVAL; 361 if (optname == IPV6_RTHDR && opt && opt->srcrt) { 362 struct ipv6_rt_hdr *rthdr = opt->srcrt; 363 switch (rthdr->type) { 364 #if IS_ENABLED(CONFIG_IPV6_MIP6) 365 case IPV6_SRCRT_TYPE_2: 366 if (rthdr->hdrlen != 2 || rthdr->segments_left != 1) 367 goto sticky_done; 368 break; 369 #endif 370 case IPV6_SRCRT_TYPE_4: 371 { 372 struct ipv6_sr_hdr *srh = 373 (struct ipv6_sr_hdr *)opt->srcrt; 374 375 if (!seg6_validate_srh(srh, optlen, false)) 376 goto sticky_done; 377 break; 378 } 379 default: 380 goto sticky_done; 381 } 382 } 383 384 err = 0; 385 opt = ipv6_update_options(sk, opt); 386 sticky_done: 387 if (opt) { 388 atomic_sub(opt->tot_len, &sk->sk_omem_alloc); 389 txopt_put(opt); 390 } 391 return err; 392 } 393 394 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname, 395 sockptr_t optval, unsigned int optlen) 396 { 397 struct ipv6_pinfo *np = inet6_sk(sk); 398 struct net *net = sock_net(sk); 399 int val, valbool; 400 int retv = -ENOPROTOOPT; 401 bool needs_rtnl = setsockopt_needs_rtnl(optname); 402 403 if (sockptr_is_null(optval)) 404 val = 0; 405 else { 406 if (optlen >= sizeof(int)) { 407 if (copy_from_sockptr(&val, optval, sizeof(val))) 408 return -EFAULT; 409 } else 410 val = 0; 411 } 412 413 valbool = (val != 0); 414 415 if (ip6_mroute_opt(optname)) 416 return ip6_mroute_setsockopt(sk, optname, optval, optlen); 417 418 if (needs_rtnl) 419 rtnl_lock(); 420 sockopt_lock_sock(sk); 421 422 switch (optname) { 423 424 case IPV6_ADDRFORM: 425 if (optlen < sizeof(int)) 426 goto e_inval; 427 if (val == PF_INET) { 428 struct ipv6_txoptions *opt; 429 struct sk_buff *pktopt; 430 431 if (sk->sk_type == SOCK_RAW) 432 break; 433 434 if (sk->sk_protocol == IPPROTO_UDP || 435 sk->sk_protocol == IPPROTO_UDPLITE) { 436 struct udp_sock *up = udp_sk(sk); 437 if (up->pending == AF_INET6) { 438 retv = -EBUSY; 439 break; 440 } 441 } else if (sk->sk_protocol == IPPROTO_TCP) { 442 if (sk->sk_prot != &tcpv6_prot) { 443 retv = -EBUSY; 444 break; 445 } 446 } else { 447 break; 448 } 449 450 if (sk->sk_state != TCP_ESTABLISHED) { 451 retv = -ENOTCONN; 452 break; 453 } 454 455 if (ipv6_only_sock(sk) || 456 !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) { 457 retv = -EADDRNOTAVAIL; 458 break; 459 } 460 461 fl6_free_socklist(sk); 462 __ipv6_sock_mc_close(sk); 463 __ipv6_sock_ac_close(sk); 464 465 /* 466 * Sock is moving from IPv6 to IPv4 (sk_prot), so 467 * remove it from the refcnt debug socks count in the 468 * original family... 469 */ 470 sk_refcnt_debug_dec(sk); 471 472 if (sk->sk_protocol == IPPROTO_TCP) { 473 struct inet_connection_sock *icsk = inet_csk(sk); 474 475 sock_prot_inuse_add(net, sk->sk_prot, -1); 476 sock_prot_inuse_add(net, &tcp_prot, 1); 477 478 /* Paired with READ_ONCE(sk->sk_prot) in net/ipv6/af_inet6.c */ 479 WRITE_ONCE(sk->sk_prot, &tcp_prot); 480 icsk->icsk_af_ops = &ipv4_specific; 481 sk->sk_socket->ops = &inet_stream_ops; 482 sk->sk_family = PF_INET; 483 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie); 484 } else { 485 struct proto *prot = &udp_prot; 486 487 if (sk->sk_protocol == IPPROTO_UDPLITE) 488 prot = &udplite_prot; 489 490 sock_prot_inuse_add(net, sk->sk_prot, -1); 491 sock_prot_inuse_add(net, prot, 1); 492 493 /* Paired with READ_ONCE(sk->sk_prot) in net/ipv6/af_inet6.c */ 494 WRITE_ONCE(sk->sk_prot, prot); 495 sk->sk_socket->ops = &inet_dgram_ops; 496 sk->sk_family = PF_INET; 497 } 498 opt = xchg((__force struct ipv6_txoptions **)&np->opt, 499 NULL); 500 if (opt) { 501 atomic_sub(opt->tot_len, &sk->sk_omem_alloc); 502 txopt_put(opt); 503 } 504 pktopt = xchg(&np->pktoptions, NULL); 505 kfree_skb(pktopt); 506 507 /* 508 * ... and add it to the refcnt debug socks count 509 * in the new family. -acme 510 */ 511 sk_refcnt_debug_inc(sk); 512 module_put(THIS_MODULE); 513 retv = 0; 514 break; 515 } 516 goto e_inval; 517 518 case IPV6_V6ONLY: 519 if (optlen < sizeof(int) || 520 inet_sk(sk)->inet_num) 521 goto e_inval; 522 sk->sk_ipv6only = valbool; 523 retv = 0; 524 break; 525 526 case IPV6_RECVPKTINFO: 527 if (optlen < sizeof(int)) 528 goto e_inval; 529 np->rxopt.bits.rxinfo = valbool; 530 retv = 0; 531 break; 532 533 case IPV6_2292PKTINFO: 534 if (optlen < sizeof(int)) 535 goto e_inval; 536 np->rxopt.bits.rxoinfo = valbool; 537 retv = 0; 538 break; 539 540 case IPV6_RECVHOPLIMIT: 541 if (optlen < sizeof(int)) 542 goto e_inval; 543 np->rxopt.bits.rxhlim = valbool; 544 retv = 0; 545 break; 546 547 case IPV6_2292HOPLIMIT: 548 if (optlen < sizeof(int)) 549 goto e_inval; 550 np->rxopt.bits.rxohlim = valbool; 551 retv = 0; 552 break; 553 554 case IPV6_RECVRTHDR: 555 if (optlen < sizeof(int)) 556 goto e_inval; 557 np->rxopt.bits.srcrt = valbool; 558 retv = 0; 559 break; 560 561 case IPV6_2292RTHDR: 562 if (optlen < sizeof(int)) 563 goto e_inval; 564 np->rxopt.bits.osrcrt = valbool; 565 retv = 0; 566 break; 567 568 case IPV6_RECVHOPOPTS: 569 if (optlen < sizeof(int)) 570 goto e_inval; 571 np->rxopt.bits.hopopts = valbool; 572 retv = 0; 573 break; 574 575 case IPV6_2292HOPOPTS: 576 if (optlen < sizeof(int)) 577 goto e_inval; 578 np->rxopt.bits.ohopopts = valbool; 579 retv = 0; 580 break; 581 582 case IPV6_RECVDSTOPTS: 583 if (optlen < sizeof(int)) 584 goto e_inval; 585 np->rxopt.bits.dstopts = valbool; 586 retv = 0; 587 break; 588 589 case IPV6_2292DSTOPTS: 590 if (optlen < sizeof(int)) 591 goto e_inval; 592 np->rxopt.bits.odstopts = valbool; 593 retv = 0; 594 break; 595 596 case IPV6_TCLASS: 597 if (optlen < sizeof(int)) 598 goto e_inval; 599 if (val < -1 || val > 0xff) 600 goto e_inval; 601 /* RFC 3542, 6.5: default traffic class of 0x0 */ 602 if (val == -1) 603 val = 0; 604 if (sk->sk_type == SOCK_STREAM) { 605 val &= ~INET_ECN_MASK; 606 val |= np->tclass & INET_ECN_MASK; 607 } 608 if (np->tclass != val) { 609 np->tclass = val; 610 sk_dst_reset(sk); 611 } 612 retv = 0; 613 break; 614 615 case IPV6_RECVTCLASS: 616 if (optlen < sizeof(int)) 617 goto e_inval; 618 np->rxopt.bits.rxtclass = valbool; 619 retv = 0; 620 break; 621 622 case IPV6_FLOWINFO: 623 if (optlen < sizeof(int)) 624 goto e_inval; 625 np->rxopt.bits.rxflow = valbool; 626 retv = 0; 627 break; 628 629 case IPV6_RECVPATHMTU: 630 if (optlen < sizeof(int)) 631 goto e_inval; 632 np->rxopt.bits.rxpmtu = valbool; 633 retv = 0; 634 break; 635 636 case IPV6_TRANSPARENT: 637 if (valbool && !sockopt_ns_capable(net->user_ns, CAP_NET_RAW) && 638 !sockopt_ns_capable(net->user_ns, CAP_NET_ADMIN)) { 639 retv = -EPERM; 640 break; 641 } 642 if (optlen < sizeof(int)) 643 goto e_inval; 644 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */ 645 inet_sk(sk)->transparent = valbool; 646 retv = 0; 647 break; 648 649 case IPV6_FREEBIND: 650 if (optlen < sizeof(int)) 651 goto e_inval; 652 /* we also don't have a separate freebind bit for IPV6 */ 653 inet_sk(sk)->freebind = valbool; 654 retv = 0; 655 break; 656 657 case IPV6_RECVORIGDSTADDR: 658 if (optlen < sizeof(int)) 659 goto e_inval; 660 np->rxopt.bits.rxorigdstaddr = valbool; 661 retv = 0; 662 break; 663 664 case IPV6_HOPOPTS: 665 case IPV6_RTHDRDSTOPTS: 666 case IPV6_RTHDR: 667 case IPV6_DSTOPTS: 668 retv = ipv6_set_opt_hdr(sk, optname, optval, optlen); 669 break; 670 671 case IPV6_PKTINFO: 672 { 673 struct in6_pktinfo pkt; 674 675 if (optlen == 0) 676 goto e_inval; 677 else if (optlen < sizeof(struct in6_pktinfo) || 678 sockptr_is_null(optval)) 679 goto e_inval; 680 681 if (copy_from_sockptr(&pkt, optval, sizeof(pkt))) { 682 retv = -EFAULT; 683 break; 684 } 685 if (!sk_dev_equal_l3scope(sk, pkt.ipi6_ifindex)) 686 goto e_inval; 687 688 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex; 689 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr; 690 retv = 0; 691 break; 692 } 693 694 case IPV6_2292PKTOPTIONS: 695 { 696 struct ipv6_txoptions *opt = NULL; 697 struct msghdr msg; 698 struct flowi6 fl6; 699 struct ipcm6_cookie ipc6; 700 701 memset(&fl6, 0, sizeof(fl6)); 702 fl6.flowi6_oif = sk->sk_bound_dev_if; 703 fl6.flowi6_mark = sk->sk_mark; 704 705 if (optlen == 0) 706 goto update; 707 708 /* 1K is probably excessive 709 * 1K is surely not enough, 2K per standard header is 16K. 710 */ 711 retv = -EINVAL; 712 if (optlen > 64*1024) 713 break; 714 715 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL); 716 retv = -ENOBUFS; 717 if (!opt) 718 break; 719 720 memset(opt, 0, sizeof(*opt)); 721 refcount_set(&opt->refcnt, 1); 722 opt->tot_len = sizeof(*opt) + optlen; 723 retv = -EFAULT; 724 if (copy_from_sockptr(opt + 1, optval, optlen)) 725 goto done; 726 727 msg.msg_controllen = optlen; 728 msg.msg_control = (void *)(opt+1); 729 ipc6.opt = opt; 730 731 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6); 732 if (retv) 733 goto done; 734 update: 735 retv = 0; 736 opt = ipv6_update_options(sk, opt); 737 done: 738 if (opt) { 739 atomic_sub(opt->tot_len, &sk->sk_omem_alloc); 740 txopt_put(opt); 741 } 742 break; 743 } 744 case IPV6_UNICAST_HOPS: 745 if (optlen < sizeof(int)) 746 goto e_inval; 747 if (val > 255 || val < -1) 748 goto e_inval; 749 np->hop_limit = val; 750 retv = 0; 751 break; 752 753 case IPV6_MULTICAST_HOPS: 754 if (sk->sk_type == SOCK_STREAM) 755 break; 756 if (optlen < sizeof(int)) 757 goto e_inval; 758 if (val > 255 || val < -1) 759 goto e_inval; 760 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val); 761 retv = 0; 762 break; 763 764 case IPV6_MULTICAST_LOOP: 765 if (optlen < sizeof(int)) 766 goto e_inval; 767 if (val != valbool) 768 goto e_inval; 769 np->mc_loop = valbool; 770 retv = 0; 771 break; 772 773 case IPV6_UNICAST_IF: 774 { 775 struct net_device *dev = NULL; 776 int ifindex; 777 778 if (optlen != sizeof(int)) 779 goto e_inval; 780 781 ifindex = (__force int)ntohl((__force __be32)val); 782 if (ifindex == 0) { 783 np->ucast_oif = 0; 784 retv = 0; 785 break; 786 } 787 788 dev = dev_get_by_index(net, ifindex); 789 retv = -EADDRNOTAVAIL; 790 if (!dev) 791 break; 792 dev_put(dev); 793 794 retv = -EINVAL; 795 if (sk->sk_bound_dev_if) 796 break; 797 798 np->ucast_oif = ifindex; 799 retv = 0; 800 break; 801 } 802 803 case IPV6_MULTICAST_IF: 804 if (sk->sk_type == SOCK_STREAM) 805 break; 806 if (optlen < sizeof(int)) 807 goto e_inval; 808 809 if (val) { 810 struct net_device *dev; 811 int midx; 812 813 rcu_read_lock(); 814 815 dev = dev_get_by_index_rcu(net, val); 816 if (!dev) { 817 rcu_read_unlock(); 818 retv = -ENODEV; 819 break; 820 } 821 midx = l3mdev_master_ifindex_rcu(dev); 822 823 rcu_read_unlock(); 824 825 if (sk->sk_bound_dev_if && 826 sk->sk_bound_dev_if != val && 827 (!midx || midx != sk->sk_bound_dev_if)) 828 goto e_inval; 829 } 830 np->mcast_oif = val; 831 retv = 0; 832 break; 833 case IPV6_ADD_MEMBERSHIP: 834 case IPV6_DROP_MEMBERSHIP: 835 { 836 struct ipv6_mreq mreq; 837 838 if (optlen < sizeof(struct ipv6_mreq)) 839 goto e_inval; 840 841 retv = -EPROTO; 842 if (inet_sk(sk)->is_icsk) 843 break; 844 845 retv = -EFAULT; 846 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq))) 847 break; 848 849 if (optname == IPV6_ADD_MEMBERSHIP) 850 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr); 851 else 852 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr); 853 break; 854 } 855 case IPV6_JOIN_ANYCAST: 856 case IPV6_LEAVE_ANYCAST: 857 { 858 struct ipv6_mreq mreq; 859 860 if (optlen < sizeof(struct ipv6_mreq)) 861 goto e_inval; 862 863 retv = -EFAULT; 864 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq))) 865 break; 866 867 if (optname == IPV6_JOIN_ANYCAST) 868 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr); 869 else 870 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr); 871 break; 872 } 873 case IPV6_MULTICAST_ALL: 874 if (optlen < sizeof(int)) 875 goto e_inval; 876 np->mc_all = valbool; 877 retv = 0; 878 break; 879 880 case MCAST_JOIN_GROUP: 881 case MCAST_LEAVE_GROUP: 882 if (in_compat_syscall()) 883 retv = compat_ipv6_mcast_join_leave(sk, optname, optval, 884 optlen); 885 else 886 retv = ipv6_mcast_join_leave(sk, optname, optval, 887 optlen); 888 break; 889 case MCAST_JOIN_SOURCE_GROUP: 890 case MCAST_LEAVE_SOURCE_GROUP: 891 case MCAST_BLOCK_SOURCE: 892 case MCAST_UNBLOCK_SOURCE: 893 retv = do_ipv6_mcast_group_source(sk, optname, optval, optlen); 894 break; 895 case MCAST_MSFILTER: 896 if (in_compat_syscall()) 897 retv = compat_ipv6_set_mcast_msfilter(sk, optval, 898 optlen); 899 else 900 retv = ipv6_set_mcast_msfilter(sk, optval, optlen); 901 break; 902 case IPV6_ROUTER_ALERT: 903 if (optlen < sizeof(int)) 904 goto e_inval; 905 retv = ip6_ra_control(sk, val); 906 break; 907 case IPV6_ROUTER_ALERT_ISOLATE: 908 if (optlen < sizeof(int)) 909 goto e_inval; 910 np->rtalert_isolate = valbool; 911 retv = 0; 912 break; 913 case IPV6_MTU_DISCOVER: 914 if (optlen < sizeof(int)) 915 goto e_inval; 916 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT) 917 goto e_inval; 918 np->pmtudisc = val; 919 retv = 0; 920 break; 921 case IPV6_MTU: 922 if (optlen < sizeof(int)) 923 goto e_inval; 924 if (val && val < IPV6_MIN_MTU) 925 goto e_inval; 926 np->frag_size = val; 927 retv = 0; 928 break; 929 case IPV6_RECVERR: 930 if (optlen < sizeof(int)) 931 goto e_inval; 932 np->recverr = valbool; 933 if (!val) 934 skb_queue_purge(&sk->sk_error_queue); 935 retv = 0; 936 break; 937 case IPV6_FLOWINFO_SEND: 938 if (optlen < sizeof(int)) 939 goto e_inval; 940 np->sndflow = valbool; 941 retv = 0; 942 break; 943 case IPV6_FLOWLABEL_MGR: 944 retv = ipv6_flowlabel_opt(sk, optval, optlen); 945 break; 946 case IPV6_IPSEC_POLICY: 947 case IPV6_XFRM_POLICY: 948 retv = -EPERM; 949 if (!sockopt_ns_capable(net->user_ns, CAP_NET_ADMIN)) 950 break; 951 retv = xfrm_user_policy(sk, optname, optval, optlen); 952 break; 953 954 case IPV6_ADDR_PREFERENCES: 955 if (optlen < sizeof(int)) 956 goto e_inval; 957 retv = __ip6_sock_set_addr_preferences(sk, val); 958 break; 959 case IPV6_MINHOPCOUNT: 960 if (optlen < sizeof(int)) 961 goto e_inval; 962 if (val < 0 || val > 255) 963 goto e_inval; 964 965 if (val) 966 static_branch_enable(&ip6_min_hopcount); 967 968 /* tcp_v6_err() and tcp_v6_rcv() might read min_hopcount 969 * while we are changing it. 970 */ 971 WRITE_ONCE(np->min_hopcount, val); 972 retv = 0; 973 break; 974 case IPV6_DONTFRAG: 975 np->dontfrag = valbool; 976 retv = 0; 977 break; 978 case IPV6_AUTOFLOWLABEL: 979 np->autoflowlabel = valbool; 980 np->autoflowlabel_set = 1; 981 retv = 0; 982 break; 983 case IPV6_RECVFRAGSIZE: 984 np->rxopt.bits.recvfragsize = valbool; 985 retv = 0; 986 break; 987 case IPV6_RECVERR_RFC4884: 988 if (optlen < sizeof(int)) 989 goto e_inval; 990 if (val < 0 || val > 1) 991 goto e_inval; 992 np->recverr_rfc4884 = valbool; 993 retv = 0; 994 break; 995 } 996 997 sockopt_release_sock(sk); 998 if (needs_rtnl) 999 rtnl_unlock(); 1000 1001 return retv; 1002 1003 e_inval: 1004 sockopt_release_sock(sk); 1005 if (needs_rtnl) 1006 rtnl_unlock(); 1007 return -EINVAL; 1008 } 1009 1010 int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, 1011 unsigned int optlen) 1012 { 1013 int err; 1014 1015 if (level == SOL_IP && sk->sk_type != SOCK_RAW) 1016 return udp_prot.setsockopt(sk, level, optname, optval, optlen); 1017 1018 if (level != SOL_IPV6) 1019 return -ENOPROTOOPT; 1020 1021 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen); 1022 #ifdef CONFIG_NETFILTER 1023 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1024 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY && 1025 optname != IPV6_XFRM_POLICY) 1026 err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen); 1027 #endif 1028 return err; 1029 } 1030 EXPORT_SYMBOL(ipv6_setsockopt); 1031 1032 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt, 1033 int optname, char __user *optval, int len) 1034 { 1035 struct ipv6_opt_hdr *hdr; 1036 1037 if (!opt) 1038 return 0; 1039 1040 switch (optname) { 1041 case IPV6_HOPOPTS: 1042 hdr = opt->hopopt; 1043 break; 1044 case IPV6_RTHDRDSTOPTS: 1045 hdr = opt->dst0opt; 1046 break; 1047 case IPV6_RTHDR: 1048 hdr = (struct ipv6_opt_hdr *)opt->srcrt; 1049 break; 1050 case IPV6_DSTOPTS: 1051 hdr = opt->dst1opt; 1052 break; 1053 default: 1054 return -EINVAL; /* should not happen */ 1055 } 1056 1057 if (!hdr) 1058 return 0; 1059 1060 len = min_t(unsigned int, len, ipv6_optlen(hdr)); 1061 if (copy_to_user(optval, hdr, len)) 1062 return -EFAULT; 1063 return len; 1064 } 1065 1066 static int ipv6_get_msfilter(struct sock *sk, void __user *optval, 1067 int __user *optlen, int len) 1068 { 1069 const int size0 = offsetof(struct group_filter, gf_slist_flex); 1070 struct group_filter __user *p = optval; 1071 struct group_filter gsf; 1072 int num; 1073 int err; 1074 1075 if (len < size0) 1076 return -EINVAL; 1077 if (copy_from_user(&gsf, p, size0)) 1078 return -EFAULT; 1079 if (gsf.gf_group.ss_family != AF_INET6) 1080 return -EADDRNOTAVAIL; 1081 num = gsf.gf_numsrc; 1082 lock_sock(sk); 1083 err = ip6_mc_msfget(sk, &gsf, p->gf_slist_flex); 1084 if (!err) { 1085 if (num > gsf.gf_numsrc) 1086 num = gsf.gf_numsrc; 1087 if (put_user(GROUP_FILTER_SIZE(num), optlen) || 1088 copy_to_user(p, &gsf, size0)) 1089 err = -EFAULT; 1090 } 1091 release_sock(sk); 1092 return err; 1093 } 1094 1095 static int compat_ipv6_get_msfilter(struct sock *sk, void __user *optval, 1096 int __user *optlen) 1097 { 1098 const int size0 = offsetof(struct compat_group_filter, gf_slist_flex); 1099 struct compat_group_filter __user *p = optval; 1100 struct compat_group_filter gf32; 1101 struct group_filter gf; 1102 int len, err; 1103 int num; 1104 1105 if (get_user(len, optlen)) 1106 return -EFAULT; 1107 if (len < size0) 1108 return -EINVAL; 1109 1110 if (copy_from_user(&gf32, p, size0)) 1111 return -EFAULT; 1112 gf.gf_interface = gf32.gf_interface; 1113 gf.gf_fmode = gf32.gf_fmode; 1114 num = gf.gf_numsrc = gf32.gf_numsrc; 1115 gf.gf_group = gf32.gf_group; 1116 1117 if (gf.gf_group.ss_family != AF_INET6) 1118 return -EADDRNOTAVAIL; 1119 1120 lock_sock(sk); 1121 err = ip6_mc_msfget(sk, &gf, p->gf_slist_flex); 1122 release_sock(sk); 1123 if (err) 1124 return err; 1125 if (num > gf.gf_numsrc) 1126 num = gf.gf_numsrc; 1127 len = GROUP_FILTER_SIZE(num) - (sizeof(gf)-sizeof(gf32)); 1128 if (put_user(len, optlen) || 1129 put_user(gf.gf_fmode, &p->gf_fmode) || 1130 put_user(gf.gf_numsrc, &p->gf_numsrc)) 1131 return -EFAULT; 1132 return 0; 1133 } 1134 1135 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname, 1136 char __user *optval, int __user *optlen, unsigned int flags) 1137 { 1138 struct ipv6_pinfo *np = inet6_sk(sk); 1139 int len; 1140 int val; 1141 1142 if (ip6_mroute_opt(optname)) 1143 return ip6_mroute_getsockopt(sk, optname, optval, optlen); 1144 1145 if (get_user(len, optlen)) 1146 return -EFAULT; 1147 switch (optname) { 1148 case IPV6_ADDRFORM: 1149 if (sk->sk_protocol != IPPROTO_UDP && 1150 sk->sk_protocol != IPPROTO_UDPLITE && 1151 sk->sk_protocol != IPPROTO_TCP) 1152 return -ENOPROTOOPT; 1153 if (sk->sk_state != TCP_ESTABLISHED) 1154 return -ENOTCONN; 1155 val = sk->sk_family; 1156 break; 1157 case MCAST_MSFILTER: 1158 if (in_compat_syscall()) 1159 return compat_ipv6_get_msfilter(sk, optval, optlen); 1160 return ipv6_get_msfilter(sk, optval, optlen, len); 1161 case IPV6_2292PKTOPTIONS: 1162 { 1163 struct msghdr msg; 1164 struct sk_buff *skb; 1165 1166 if (sk->sk_type != SOCK_STREAM) 1167 return -ENOPROTOOPT; 1168 1169 msg.msg_control_user = optval; 1170 msg.msg_controllen = len; 1171 msg.msg_flags = flags; 1172 msg.msg_control_is_user = true; 1173 1174 lock_sock(sk); 1175 skb = np->pktoptions; 1176 if (skb) 1177 ip6_datagram_recv_ctl(sk, &msg, skb); 1178 release_sock(sk); 1179 if (!skb) { 1180 if (np->rxopt.bits.rxinfo) { 1181 struct in6_pktinfo src_info; 1182 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif : 1183 np->sticky_pktinfo.ipi6_ifindex; 1184 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr; 1185 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info); 1186 } 1187 if (np->rxopt.bits.rxhlim) { 1188 int hlim = np->mcast_hops; 1189 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); 1190 } 1191 if (np->rxopt.bits.rxtclass) { 1192 int tclass = (int)ip6_tclass(np->rcv_flowinfo); 1193 1194 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass); 1195 } 1196 if (np->rxopt.bits.rxoinfo) { 1197 struct in6_pktinfo src_info; 1198 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif : 1199 np->sticky_pktinfo.ipi6_ifindex; 1200 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : 1201 np->sticky_pktinfo.ipi6_addr; 1202 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); 1203 } 1204 if (np->rxopt.bits.rxohlim) { 1205 int hlim = np->mcast_hops; 1206 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); 1207 } 1208 if (np->rxopt.bits.rxflow) { 1209 __be32 flowinfo = np->rcv_flowinfo; 1210 1211 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo); 1212 } 1213 } 1214 len -= msg.msg_controllen; 1215 return put_user(len, optlen); 1216 } 1217 case IPV6_MTU: 1218 { 1219 struct dst_entry *dst; 1220 1221 val = 0; 1222 rcu_read_lock(); 1223 dst = __sk_dst_get(sk); 1224 if (dst) 1225 val = dst_mtu(dst); 1226 rcu_read_unlock(); 1227 if (!val) 1228 return -ENOTCONN; 1229 break; 1230 } 1231 1232 case IPV6_V6ONLY: 1233 val = sk->sk_ipv6only; 1234 break; 1235 1236 case IPV6_RECVPKTINFO: 1237 val = np->rxopt.bits.rxinfo; 1238 break; 1239 1240 case IPV6_2292PKTINFO: 1241 val = np->rxopt.bits.rxoinfo; 1242 break; 1243 1244 case IPV6_RECVHOPLIMIT: 1245 val = np->rxopt.bits.rxhlim; 1246 break; 1247 1248 case IPV6_2292HOPLIMIT: 1249 val = np->rxopt.bits.rxohlim; 1250 break; 1251 1252 case IPV6_RECVRTHDR: 1253 val = np->rxopt.bits.srcrt; 1254 break; 1255 1256 case IPV6_2292RTHDR: 1257 val = np->rxopt.bits.osrcrt; 1258 break; 1259 1260 case IPV6_HOPOPTS: 1261 case IPV6_RTHDRDSTOPTS: 1262 case IPV6_RTHDR: 1263 case IPV6_DSTOPTS: 1264 { 1265 struct ipv6_txoptions *opt; 1266 1267 lock_sock(sk); 1268 opt = rcu_dereference_protected(np->opt, 1269 lockdep_sock_is_held(sk)); 1270 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len); 1271 release_sock(sk); 1272 /* check if ipv6_getsockopt_sticky() returns err code */ 1273 if (len < 0) 1274 return len; 1275 return put_user(len, optlen); 1276 } 1277 1278 case IPV6_RECVHOPOPTS: 1279 val = np->rxopt.bits.hopopts; 1280 break; 1281 1282 case IPV6_2292HOPOPTS: 1283 val = np->rxopt.bits.ohopopts; 1284 break; 1285 1286 case IPV6_RECVDSTOPTS: 1287 val = np->rxopt.bits.dstopts; 1288 break; 1289 1290 case IPV6_2292DSTOPTS: 1291 val = np->rxopt.bits.odstopts; 1292 break; 1293 1294 case IPV6_TCLASS: 1295 val = np->tclass; 1296 break; 1297 1298 case IPV6_RECVTCLASS: 1299 val = np->rxopt.bits.rxtclass; 1300 break; 1301 1302 case IPV6_FLOWINFO: 1303 val = np->rxopt.bits.rxflow; 1304 break; 1305 1306 case IPV6_RECVPATHMTU: 1307 val = np->rxopt.bits.rxpmtu; 1308 break; 1309 1310 case IPV6_PATHMTU: 1311 { 1312 struct dst_entry *dst; 1313 struct ip6_mtuinfo mtuinfo; 1314 1315 if (len < sizeof(mtuinfo)) 1316 return -EINVAL; 1317 1318 len = sizeof(mtuinfo); 1319 memset(&mtuinfo, 0, sizeof(mtuinfo)); 1320 1321 rcu_read_lock(); 1322 dst = __sk_dst_get(sk); 1323 if (dst) 1324 mtuinfo.ip6m_mtu = dst_mtu(dst); 1325 rcu_read_unlock(); 1326 if (!mtuinfo.ip6m_mtu) 1327 return -ENOTCONN; 1328 1329 if (put_user(len, optlen)) 1330 return -EFAULT; 1331 if (copy_to_user(optval, &mtuinfo, len)) 1332 return -EFAULT; 1333 1334 return 0; 1335 } 1336 1337 case IPV6_TRANSPARENT: 1338 val = inet_sk(sk)->transparent; 1339 break; 1340 1341 case IPV6_FREEBIND: 1342 val = inet_sk(sk)->freebind; 1343 break; 1344 1345 case IPV6_RECVORIGDSTADDR: 1346 val = np->rxopt.bits.rxorigdstaddr; 1347 break; 1348 1349 case IPV6_UNICAST_HOPS: 1350 case IPV6_MULTICAST_HOPS: 1351 { 1352 struct dst_entry *dst; 1353 1354 if (optname == IPV6_UNICAST_HOPS) 1355 val = np->hop_limit; 1356 else 1357 val = np->mcast_hops; 1358 1359 if (val < 0) { 1360 rcu_read_lock(); 1361 dst = __sk_dst_get(sk); 1362 if (dst) 1363 val = ip6_dst_hoplimit(dst); 1364 rcu_read_unlock(); 1365 } 1366 1367 if (val < 0) 1368 val = sock_net(sk)->ipv6.devconf_all->hop_limit; 1369 break; 1370 } 1371 1372 case IPV6_MULTICAST_LOOP: 1373 val = np->mc_loop; 1374 break; 1375 1376 case IPV6_MULTICAST_IF: 1377 val = np->mcast_oif; 1378 break; 1379 1380 case IPV6_MULTICAST_ALL: 1381 val = np->mc_all; 1382 break; 1383 1384 case IPV6_UNICAST_IF: 1385 val = (__force int)htonl((__u32) np->ucast_oif); 1386 break; 1387 1388 case IPV6_MTU_DISCOVER: 1389 val = np->pmtudisc; 1390 break; 1391 1392 case IPV6_RECVERR: 1393 val = np->recverr; 1394 break; 1395 1396 case IPV6_FLOWINFO_SEND: 1397 val = np->sndflow; 1398 break; 1399 1400 case IPV6_FLOWLABEL_MGR: 1401 { 1402 struct in6_flowlabel_req freq; 1403 int flags; 1404 1405 if (len < sizeof(freq)) 1406 return -EINVAL; 1407 1408 if (copy_from_user(&freq, optval, sizeof(freq))) 1409 return -EFAULT; 1410 1411 if (freq.flr_action != IPV6_FL_A_GET) 1412 return -EINVAL; 1413 1414 len = sizeof(freq); 1415 flags = freq.flr_flags; 1416 1417 memset(&freq, 0, sizeof(freq)); 1418 1419 val = ipv6_flowlabel_opt_get(sk, &freq, flags); 1420 if (val < 0) 1421 return val; 1422 1423 if (put_user(len, optlen)) 1424 return -EFAULT; 1425 if (copy_to_user(optval, &freq, len)) 1426 return -EFAULT; 1427 1428 return 0; 1429 } 1430 1431 case IPV6_ADDR_PREFERENCES: 1432 val = 0; 1433 1434 if (np->srcprefs & IPV6_PREFER_SRC_TMP) 1435 val |= IPV6_PREFER_SRC_TMP; 1436 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC) 1437 val |= IPV6_PREFER_SRC_PUBLIC; 1438 else { 1439 /* XXX: should we return system default? */ 1440 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT; 1441 } 1442 1443 if (np->srcprefs & IPV6_PREFER_SRC_COA) 1444 val |= IPV6_PREFER_SRC_COA; 1445 else 1446 val |= IPV6_PREFER_SRC_HOME; 1447 break; 1448 1449 case IPV6_MINHOPCOUNT: 1450 val = np->min_hopcount; 1451 break; 1452 1453 case IPV6_DONTFRAG: 1454 val = np->dontfrag; 1455 break; 1456 1457 case IPV6_AUTOFLOWLABEL: 1458 val = ip6_autoflowlabel(sock_net(sk), np); 1459 break; 1460 1461 case IPV6_RECVFRAGSIZE: 1462 val = np->rxopt.bits.recvfragsize; 1463 break; 1464 1465 case IPV6_ROUTER_ALERT_ISOLATE: 1466 val = np->rtalert_isolate; 1467 break; 1468 1469 case IPV6_RECVERR_RFC4884: 1470 val = np->recverr_rfc4884; 1471 break; 1472 1473 default: 1474 return -ENOPROTOOPT; 1475 } 1476 len = min_t(unsigned int, sizeof(int), len); 1477 if (put_user(len, optlen)) 1478 return -EFAULT; 1479 if (copy_to_user(optval, &val, len)) 1480 return -EFAULT; 1481 return 0; 1482 } 1483 1484 int ipv6_getsockopt(struct sock *sk, int level, int optname, 1485 char __user *optval, int __user *optlen) 1486 { 1487 int err; 1488 1489 if (level == SOL_IP && sk->sk_type != SOCK_RAW) 1490 return udp_prot.getsockopt(sk, level, optname, optval, optlen); 1491 1492 if (level != SOL_IPV6) 1493 return -ENOPROTOOPT; 1494 1495 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0); 1496 #ifdef CONFIG_NETFILTER 1497 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1498 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) { 1499 int len; 1500 1501 if (get_user(len, optlen)) 1502 return -EFAULT; 1503 1504 err = nf_getsockopt(sk, PF_INET6, optname, optval, &len); 1505 if (err >= 0) 1506 err = put_user(len, optlen); 1507 } 1508 #endif 1509 return err; 1510 } 1511 EXPORT_SYMBOL(ipv6_getsockopt); 1512