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 && !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 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 sk->sk_prot = &tcp_prot; 479 icsk->icsk_af_ops = &ipv4_specific; 480 sk->sk_socket->ops = &inet_stream_ops; 481 sk->sk_family = PF_INET; 482 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie); 483 } else { 484 struct proto *prot = &udp_prot; 485 486 if (sk->sk_protocol == IPPROTO_UDPLITE) 487 prot = &udplite_prot; 488 489 sock_prot_inuse_add(net, sk->sk_prot, -1); 490 sock_prot_inuse_add(net, prot, 1); 491 492 sk->sk_prot = prot; 493 sk->sk_socket->ops = &inet_dgram_ops; 494 sk->sk_family = PF_INET; 495 } 496 opt = xchg((__force struct ipv6_txoptions **)&np->opt, 497 NULL); 498 if (opt) { 499 atomic_sub(opt->tot_len, &sk->sk_omem_alloc); 500 txopt_put(opt); 501 } 502 pktopt = xchg(&np->pktoptions, NULL); 503 kfree_skb(pktopt); 504 505 /* 506 * ... and add it to the refcnt debug socks count 507 * in the new family. -acme 508 */ 509 sk_refcnt_debug_inc(sk); 510 module_put(THIS_MODULE); 511 retv = 0; 512 break; 513 } 514 goto e_inval; 515 516 case IPV6_V6ONLY: 517 if (optlen < sizeof(int) || 518 inet_sk(sk)->inet_num) 519 goto e_inval; 520 sk->sk_ipv6only = valbool; 521 retv = 0; 522 break; 523 524 case IPV6_RECVPKTINFO: 525 if (optlen < sizeof(int)) 526 goto e_inval; 527 np->rxopt.bits.rxinfo = valbool; 528 retv = 0; 529 break; 530 531 case IPV6_2292PKTINFO: 532 if (optlen < sizeof(int)) 533 goto e_inval; 534 np->rxopt.bits.rxoinfo = valbool; 535 retv = 0; 536 break; 537 538 case IPV6_RECVHOPLIMIT: 539 if (optlen < sizeof(int)) 540 goto e_inval; 541 np->rxopt.bits.rxhlim = valbool; 542 retv = 0; 543 break; 544 545 case IPV6_2292HOPLIMIT: 546 if (optlen < sizeof(int)) 547 goto e_inval; 548 np->rxopt.bits.rxohlim = valbool; 549 retv = 0; 550 break; 551 552 case IPV6_RECVRTHDR: 553 if (optlen < sizeof(int)) 554 goto e_inval; 555 np->rxopt.bits.srcrt = valbool; 556 retv = 0; 557 break; 558 559 case IPV6_2292RTHDR: 560 if (optlen < sizeof(int)) 561 goto e_inval; 562 np->rxopt.bits.osrcrt = valbool; 563 retv = 0; 564 break; 565 566 case IPV6_RECVHOPOPTS: 567 if (optlen < sizeof(int)) 568 goto e_inval; 569 np->rxopt.bits.hopopts = valbool; 570 retv = 0; 571 break; 572 573 case IPV6_2292HOPOPTS: 574 if (optlen < sizeof(int)) 575 goto e_inval; 576 np->rxopt.bits.ohopopts = valbool; 577 retv = 0; 578 break; 579 580 case IPV6_RECVDSTOPTS: 581 if (optlen < sizeof(int)) 582 goto e_inval; 583 np->rxopt.bits.dstopts = valbool; 584 retv = 0; 585 break; 586 587 case IPV6_2292DSTOPTS: 588 if (optlen < sizeof(int)) 589 goto e_inval; 590 np->rxopt.bits.odstopts = valbool; 591 retv = 0; 592 break; 593 594 case IPV6_TCLASS: 595 if (optlen < sizeof(int)) 596 goto e_inval; 597 if (val < -1 || val > 0xff) 598 goto e_inval; 599 /* RFC 3542, 6.5: default traffic class of 0x0 */ 600 if (val == -1) 601 val = 0; 602 if (sk->sk_type == SOCK_STREAM) { 603 val &= ~INET_ECN_MASK; 604 val |= np->tclass & INET_ECN_MASK; 605 } 606 if (np->tclass != val) { 607 np->tclass = val; 608 sk_dst_reset(sk); 609 } 610 retv = 0; 611 break; 612 613 case IPV6_RECVTCLASS: 614 if (optlen < sizeof(int)) 615 goto e_inval; 616 np->rxopt.bits.rxtclass = valbool; 617 retv = 0; 618 break; 619 620 case IPV6_FLOWINFO: 621 if (optlen < sizeof(int)) 622 goto e_inval; 623 np->rxopt.bits.rxflow = valbool; 624 retv = 0; 625 break; 626 627 case IPV6_RECVPATHMTU: 628 if (optlen < sizeof(int)) 629 goto e_inval; 630 np->rxopt.bits.rxpmtu = valbool; 631 retv = 0; 632 break; 633 634 case IPV6_TRANSPARENT: 635 if (valbool && !ns_capable(net->user_ns, CAP_NET_RAW) && 636 !ns_capable(net->user_ns, CAP_NET_ADMIN)) { 637 retv = -EPERM; 638 break; 639 } 640 if (optlen < sizeof(int)) 641 goto e_inval; 642 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */ 643 inet_sk(sk)->transparent = valbool; 644 retv = 0; 645 break; 646 647 case IPV6_FREEBIND: 648 if (optlen < sizeof(int)) 649 goto e_inval; 650 /* we also don't have a separate freebind bit for IPV6 */ 651 inet_sk(sk)->freebind = valbool; 652 retv = 0; 653 break; 654 655 case IPV6_RECVORIGDSTADDR: 656 if (optlen < sizeof(int)) 657 goto e_inval; 658 np->rxopt.bits.rxorigdstaddr = valbool; 659 retv = 0; 660 break; 661 662 case IPV6_HOPOPTS: 663 case IPV6_RTHDRDSTOPTS: 664 case IPV6_RTHDR: 665 case IPV6_DSTOPTS: 666 retv = ipv6_set_opt_hdr(sk, optname, optval, optlen); 667 break; 668 669 case IPV6_PKTINFO: 670 { 671 struct in6_pktinfo pkt; 672 673 if (optlen == 0) 674 goto e_inval; 675 else if (optlen < sizeof(struct in6_pktinfo) || 676 sockptr_is_null(optval)) 677 goto e_inval; 678 679 if (copy_from_sockptr(&pkt, optval, sizeof(pkt))) { 680 retv = -EFAULT; 681 break; 682 } 683 if (!sk_dev_equal_l3scope(sk, pkt.ipi6_ifindex)) 684 goto e_inval; 685 686 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex; 687 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr; 688 retv = 0; 689 break; 690 } 691 692 case IPV6_2292PKTOPTIONS: 693 { 694 struct ipv6_txoptions *opt = NULL; 695 struct msghdr msg; 696 struct flowi6 fl6; 697 struct ipcm6_cookie ipc6; 698 699 memset(&fl6, 0, sizeof(fl6)); 700 fl6.flowi6_oif = sk->sk_bound_dev_if; 701 fl6.flowi6_mark = sk->sk_mark; 702 703 if (optlen == 0) 704 goto update; 705 706 /* 1K is probably excessive 707 * 1K is surely not enough, 2K per standard header is 16K. 708 */ 709 retv = -EINVAL; 710 if (optlen > 64*1024) 711 break; 712 713 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL); 714 retv = -ENOBUFS; 715 if (!opt) 716 break; 717 718 memset(opt, 0, sizeof(*opt)); 719 refcount_set(&opt->refcnt, 1); 720 opt->tot_len = sizeof(*opt) + optlen; 721 retv = -EFAULT; 722 if (copy_from_sockptr(opt + 1, optval, optlen)) 723 goto done; 724 725 msg.msg_controllen = optlen; 726 msg.msg_control = (void *)(opt+1); 727 ipc6.opt = opt; 728 729 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6); 730 if (retv) 731 goto done; 732 update: 733 retv = 0; 734 opt = ipv6_update_options(sk, opt); 735 done: 736 if (opt) { 737 atomic_sub(opt->tot_len, &sk->sk_omem_alloc); 738 txopt_put(opt); 739 } 740 break; 741 } 742 case IPV6_UNICAST_HOPS: 743 if (optlen < sizeof(int)) 744 goto e_inval; 745 if (val > 255 || val < -1) 746 goto e_inval; 747 np->hop_limit = val; 748 retv = 0; 749 break; 750 751 case IPV6_MULTICAST_HOPS: 752 if (sk->sk_type == SOCK_STREAM) 753 break; 754 if (optlen < sizeof(int)) 755 goto e_inval; 756 if (val > 255 || val < -1) 757 goto e_inval; 758 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val); 759 retv = 0; 760 break; 761 762 case IPV6_MULTICAST_LOOP: 763 if (optlen < sizeof(int)) 764 goto e_inval; 765 if (val != valbool) 766 goto e_inval; 767 np->mc_loop = valbool; 768 retv = 0; 769 break; 770 771 case IPV6_UNICAST_IF: 772 { 773 struct net_device *dev = NULL; 774 int ifindex; 775 776 if (optlen != sizeof(int)) 777 goto e_inval; 778 779 ifindex = (__force int)ntohl((__force __be32)val); 780 if (ifindex == 0) { 781 np->ucast_oif = 0; 782 retv = 0; 783 break; 784 } 785 786 dev = dev_get_by_index(net, ifindex); 787 retv = -EADDRNOTAVAIL; 788 if (!dev) 789 break; 790 dev_put(dev); 791 792 retv = -EINVAL; 793 if (sk->sk_bound_dev_if) 794 break; 795 796 np->ucast_oif = ifindex; 797 retv = 0; 798 break; 799 } 800 801 case IPV6_MULTICAST_IF: 802 if (sk->sk_type == SOCK_STREAM) 803 break; 804 if (optlen < sizeof(int)) 805 goto e_inval; 806 807 if (val) { 808 struct net_device *dev; 809 int midx; 810 811 rcu_read_lock(); 812 813 dev = dev_get_by_index_rcu(net, val); 814 if (!dev) { 815 rcu_read_unlock(); 816 retv = -ENODEV; 817 break; 818 } 819 midx = l3mdev_master_ifindex_rcu(dev); 820 821 rcu_read_unlock(); 822 823 if (sk->sk_bound_dev_if && 824 sk->sk_bound_dev_if != val && 825 (!midx || midx != sk->sk_bound_dev_if)) 826 goto e_inval; 827 } 828 np->mcast_oif = val; 829 retv = 0; 830 break; 831 case IPV6_ADD_MEMBERSHIP: 832 case IPV6_DROP_MEMBERSHIP: 833 { 834 struct ipv6_mreq mreq; 835 836 if (optlen < sizeof(struct ipv6_mreq)) 837 goto e_inval; 838 839 retv = -EPROTO; 840 if (inet_sk(sk)->is_icsk) 841 break; 842 843 retv = -EFAULT; 844 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq))) 845 break; 846 847 if (optname == IPV6_ADD_MEMBERSHIP) 848 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr); 849 else 850 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr); 851 break; 852 } 853 case IPV6_JOIN_ANYCAST: 854 case IPV6_LEAVE_ANYCAST: 855 { 856 struct ipv6_mreq mreq; 857 858 if (optlen < sizeof(struct ipv6_mreq)) 859 goto e_inval; 860 861 retv = -EFAULT; 862 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq))) 863 break; 864 865 if (optname == IPV6_JOIN_ANYCAST) 866 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr); 867 else 868 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr); 869 break; 870 } 871 case IPV6_MULTICAST_ALL: 872 if (optlen < sizeof(int)) 873 goto e_inval; 874 np->mc_all = valbool; 875 retv = 0; 876 break; 877 878 case MCAST_JOIN_GROUP: 879 case MCAST_LEAVE_GROUP: 880 if (in_compat_syscall()) 881 retv = compat_ipv6_mcast_join_leave(sk, optname, optval, 882 optlen); 883 else 884 retv = ipv6_mcast_join_leave(sk, optname, optval, 885 optlen); 886 break; 887 case MCAST_JOIN_SOURCE_GROUP: 888 case MCAST_LEAVE_SOURCE_GROUP: 889 case MCAST_BLOCK_SOURCE: 890 case MCAST_UNBLOCK_SOURCE: 891 retv = do_ipv6_mcast_group_source(sk, optname, optval, optlen); 892 break; 893 case MCAST_MSFILTER: 894 if (in_compat_syscall()) 895 retv = compat_ipv6_set_mcast_msfilter(sk, optval, 896 optlen); 897 else 898 retv = ipv6_set_mcast_msfilter(sk, optval, optlen); 899 break; 900 case IPV6_ROUTER_ALERT: 901 if (optlen < sizeof(int)) 902 goto e_inval; 903 retv = ip6_ra_control(sk, val); 904 break; 905 case IPV6_ROUTER_ALERT_ISOLATE: 906 if (optlen < sizeof(int)) 907 goto e_inval; 908 np->rtalert_isolate = valbool; 909 retv = 0; 910 break; 911 case IPV6_MTU_DISCOVER: 912 if (optlen < sizeof(int)) 913 goto e_inval; 914 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT) 915 goto e_inval; 916 np->pmtudisc = val; 917 retv = 0; 918 break; 919 case IPV6_MTU: 920 if (optlen < sizeof(int)) 921 goto e_inval; 922 if (val && val < IPV6_MIN_MTU) 923 goto e_inval; 924 np->frag_size = val; 925 retv = 0; 926 break; 927 case IPV6_RECVERR: 928 if (optlen < sizeof(int)) 929 goto e_inval; 930 np->recverr = valbool; 931 if (!val) 932 skb_queue_purge(&sk->sk_error_queue); 933 retv = 0; 934 break; 935 case IPV6_FLOWINFO_SEND: 936 if (optlen < sizeof(int)) 937 goto e_inval; 938 np->sndflow = valbool; 939 retv = 0; 940 break; 941 case IPV6_FLOWLABEL_MGR: 942 retv = ipv6_flowlabel_opt(sk, optval, optlen); 943 break; 944 case IPV6_IPSEC_POLICY: 945 case IPV6_XFRM_POLICY: 946 retv = -EPERM; 947 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 948 break; 949 retv = xfrm_user_policy(sk, optname, optval, optlen); 950 break; 951 952 case IPV6_ADDR_PREFERENCES: 953 if (optlen < sizeof(int)) 954 goto e_inval; 955 retv = __ip6_sock_set_addr_preferences(sk, val); 956 break; 957 case IPV6_MINHOPCOUNT: 958 if (optlen < sizeof(int)) 959 goto e_inval; 960 if (val < 0 || val > 255) 961 goto e_inval; 962 963 if (val) 964 static_branch_enable(&ip6_min_hopcount); 965 966 /* tcp_v6_err() and tcp_v6_rcv() might read min_hopcount 967 * while we are changing it. 968 */ 969 WRITE_ONCE(np->min_hopcount, val); 970 retv = 0; 971 break; 972 case IPV6_DONTFRAG: 973 np->dontfrag = valbool; 974 retv = 0; 975 break; 976 case IPV6_AUTOFLOWLABEL: 977 np->autoflowlabel = valbool; 978 np->autoflowlabel_set = 1; 979 retv = 0; 980 break; 981 case IPV6_RECVFRAGSIZE: 982 np->rxopt.bits.recvfragsize = valbool; 983 retv = 0; 984 break; 985 case IPV6_RECVERR_RFC4884: 986 if (optlen < sizeof(int)) 987 goto e_inval; 988 if (val < 0 || val > 1) 989 goto e_inval; 990 np->recverr_rfc4884 = valbool; 991 retv = 0; 992 break; 993 } 994 995 release_sock(sk); 996 if (needs_rtnl) 997 rtnl_unlock(); 998 999 return retv; 1000 1001 e_inval: 1002 release_sock(sk); 1003 if (needs_rtnl) 1004 rtnl_unlock(); 1005 return -EINVAL; 1006 } 1007 1008 int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, 1009 unsigned int optlen) 1010 { 1011 int err; 1012 1013 if (level == SOL_IP && sk->sk_type != SOCK_RAW) 1014 return udp_prot.setsockopt(sk, level, optname, optval, optlen); 1015 1016 if (level != SOL_IPV6) 1017 return -ENOPROTOOPT; 1018 1019 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen); 1020 #ifdef CONFIG_NETFILTER 1021 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1022 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY && 1023 optname != IPV6_XFRM_POLICY) 1024 err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen); 1025 #endif 1026 return err; 1027 } 1028 EXPORT_SYMBOL(ipv6_setsockopt); 1029 1030 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt, 1031 int optname, char __user *optval, int len) 1032 { 1033 struct ipv6_opt_hdr *hdr; 1034 1035 if (!opt) 1036 return 0; 1037 1038 switch (optname) { 1039 case IPV6_HOPOPTS: 1040 hdr = opt->hopopt; 1041 break; 1042 case IPV6_RTHDRDSTOPTS: 1043 hdr = opt->dst0opt; 1044 break; 1045 case IPV6_RTHDR: 1046 hdr = (struct ipv6_opt_hdr *)opt->srcrt; 1047 break; 1048 case IPV6_DSTOPTS: 1049 hdr = opt->dst1opt; 1050 break; 1051 default: 1052 return -EINVAL; /* should not happen */ 1053 } 1054 1055 if (!hdr) 1056 return 0; 1057 1058 len = min_t(unsigned int, len, ipv6_optlen(hdr)); 1059 if (copy_to_user(optval, hdr, len)) 1060 return -EFAULT; 1061 return len; 1062 } 1063 1064 static int ipv6_get_msfilter(struct sock *sk, void __user *optval, 1065 int __user *optlen, int len) 1066 { 1067 const int size0 = offsetof(struct group_filter, gf_slist_flex); 1068 struct group_filter __user *p = optval; 1069 struct group_filter gsf; 1070 int num; 1071 int err; 1072 1073 if (len < size0) 1074 return -EINVAL; 1075 if (copy_from_user(&gsf, p, size0)) 1076 return -EFAULT; 1077 if (gsf.gf_group.ss_family != AF_INET6) 1078 return -EADDRNOTAVAIL; 1079 num = gsf.gf_numsrc; 1080 lock_sock(sk); 1081 err = ip6_mc_msfget(sk, &gsf, p->gf_slist_flex); 1082 if (!err) { 1083 if (num > gsf.gf_numsrc) 1084 num = gsf.gf_numsrc; 1085 if (put_user(GROUP_FILTER_SIZE(num), optlen) || 1086 copy_to_user(p, &gsf, size0)) 1087 err = -EFAULT; 1088 } 1089 release_sock(sk); 1090 return err; 1091 } 1092 1093 static int compat_ipv6_get_msfilter(struct sock *sk, void __user *optval, 1094 int __user *optlen) 1095 { 1096 const int size0 = offsetof(struct compat_group_filter, gf_slist_flex); 1097 struct compat_group_filter __user *p = optval; 1098 struct compat_group_filter gf32; 1099 struct group_filter gf; 1100 int len, err; 1101 int num; 1102 1103 if (get_user(len, optlen)) 1104 return -EFAULT; 1105 if (len < size0) 1106 return -EINVAL; 1107 1108 if (copy_from_user(&gf32, p, size0)) 1109 return -EFAULT; 1110 gf.gf_interface = gf32.gf_interface; 1111 gf.gf_fmode = gf32.gf_fmode; 1112 num = gf.gf_numsrc = gf32.gf_numsrc; 1113 gf.gf_group = gf32.gf_group; 1114 1115 if (gf.gf_group.ss_family != AF_INET6) 1116 return -EADDRNOTAVAIL; 1117 1118 lock_sock(sk); 1119 err = ip6_mc_msfget(sk, &gf, p->gf_slist_flex); 1120 release_sock(sk); 1121 if (err) 1122 return err; 1123 if (num > gf.gf_numsrc) 1124 num = gf.gf_numsrc; 1125 len = GROUP_FILTER_SIZE(num) - (sizeof(gf)-sizeof(gf32)); 1126 if (put_user(len, optlen) || 1127 put_user(gf.gf_fmode, &p->gf_fmode) || 1128 put_user(gf.gf_numsrc, &p->gf_numsrc)) 1129 return -EFAULT; 1130 return 0; 1131 } 1132 1133 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname, 1134 char __user *optval, int __user *optlen, unsigned int flags) 1135 { 1136 struct ipv6_pinfo *np = inet6_sk(sk); 1137 int len; 1138 int val; 1139 1140 if (ip6_mroute_opt(optname)) 1141 return ip6_mroute_getsockopt(sk, optname, optval, optlen); 1142 1143 if (get_user(len, optlen)) 1144 return -EFAULT; 1145 switch (optname) { 1146 case IPV6_ADDRFORM: 1147 if (sk->sk_protocol != IPPROTO_UDP && 1148 sk->sk_protocol != IPPROTO_UDPLITE && 1149 sk->sk_protocol != IPPROTO_TCP) 1150 return -ENOPROTOOPT; 1151 if (sk->sk_state != TCP_ESTABLISHED) 1152 return -ENOTCONN; 1153 val = sk->sk_family; 1154 break; 1155 case MCAST_MSFILTER: 1156 if (in_compat_syscall()) 1157 return compat_ipv6_get_msfilter(sk, optval, optlen); 1158 return ipv6_get_msfilter(sk, optval, optlen, len); 1159 case IPV6_2292PKTOPTIONS: 1160 { 1161 struct msghdr msg; 1162 struct sk_buff *skb; 1163 1164 if (sk->sk_type != SOCK_STREAM) 1165 return -ENOPROTOOPT; 1166 1167 msg.msg_control_user = optval; 1168 msg.msg_controllen = len; 1169 msg.msg_flags = flags; 1170 msg.msg_control_is_user = true; 1171 1172 lock_sock(sk); 1173 skb = np->pktoptions; 1174 if (skb) 1175 ip6_datagram_recv_ctl(sk, &msg, skb); 1176 release_sock(sk); 1177 if (!skb) { 1178 if (np->rxopt.bits.rxinfo) { 1179 struct in6_pktinfo src_info; 1180 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif : 1181 np->sticky_pktinfo.ipi6_ifindex; 1182 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr; 1183 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info); 1184 } 1185 if (np->rxopt.bits.rxhlim) { 1186 int hlim = np->mcast_hops; 1187 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); 1188 } 1189 if (np->rxopt.bits.rxtclass) { 1190 int tclass = (int)ip6_tclass(np->rcv_flowinfo); 1191 1192 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass); 1193 } 1194 if (np->rxopt.bits.rxoinfo) { 1195 struct in6_pktinfo src_info; 1196 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif : 1197 np->sticky_pktinfo.ipi6_ifindex; 1198 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : 1199 np->sticky_pktinfo.ipi6_addr; 1200 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); 1201 } 1202 if (np->rxopt.bits.rxohlim) { 1203 int hlim = np->mcast_hops; 1204 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); 1205 } 1206 if (np->rxopt.bits.rxflow) { 1207 __be32 flowinfo = np->rcv_flowinfo; 1208 1209 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo); 1210 } 1211 } 1212 len -= msg.msg_controllen; 1213 return put_user(len, optlen); 1214 } 1215 case IPV6_MTU: 1216 { 1217 struct dst_entry *dst; 1218 1219 val = 0; 1220 rcu_read_lock(); 1221 dst = __sk_dst_get(sk); 1222 if (dst) 1223 val = dst_mtu(dst); 1224 rcu_read_unlock(); 1225 if (!val) 1226 return -ENOTCONN; 1227 break; 1228 } 1229 1230 case IPV6_V6ONLY: 1231 val = sk->sk_ipv6only; 1232 break; 1233 1234 case IPV6_RECVPKTINFO: 1235 val = np->rxopt.bits.rxinfo; 1236 break; 1237 1238 case IPV6_2292PKTINFO: 1239 val = np->rxopt.bits.rxoinfo; 1240 break; 1241 1242 case IPV6_RECVHOPLIMIT: 1243 val = np->rxopt.bits.rxhlim; 1244 break; 1245 1246 case IPV6_2292HOPLIMIT: 1247 val = np->rxopt.bits.rxohlim; 1248 break; 1249 1250 case IPV6_RECVRTHDR: 1251 val = np->rxopt.bits.srcrt; 1252 break; 1253 1254 case IPV6_2292RTHDR: 1255 val = np->rxopt.bits.osrcrt; 1256 break; 1257 1258 case IPV6_HOPOPTS: 1259 case IPV6_RTHDRDSTOPTS: 1260 case IPV6_RTHDR: 1261 case IPV6_DSTOPTS: 1262 { 1263 struct ipv6_txoptions *opt; 1264 1265 lock_sock(sk); 1266 opt = rcu_dereference_protected(np->opt, 1267 lockdep_sock_is_held(sk)); 1268 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len); 1269 release_sock(sk); 1270 /* check if ipv6_getsockopt_sticky() returns err code */ 1271 if (len < 0) 1272 return len; 1273 return put_user(len, optlen); 1274 } 1275 1276 case IPV6_RECVHOPOPTS: 1277 val = np->rxopt.bits.hopopts; 1278 break; 1279 1280 case IPV6_2292HOPOPTS: 1281 val = np->rxopt.bits.ohopopts; 1282 break; 1283 1284 case IPV6_RECVDSTOPTS: 1285 val = np->rxopt.bits.dstopts; 1286 break; 1287 1288 case IPV6_2292DSTOPTS: 1289 val = np->rxopt.bits.odstopts; 1290 break; 1291 1292 case IPV6_TCLASS: 1293 val = np->tclass; 1294 break; 1295 1296 case IPV6_RECVTCLASS: 1297 val = np->rxopt.bits.rxtclass; 1298 break; 1299 1300 case IPV6_FLOWINFO: 1301 val = np->rxopt.bits.rxflow; 1302 break; 1303 1304 case IPV6_RECVPATHMTU: 1305 val = np->rxopt.bits.rxpmtu; 1306 break; 1307 1308 case IPV6_PATHMTU: 1309 { 1310 struct dst_entry *dst; 1311 struct ip6_mtuinfo mtuinfo; 1312 1313 if (len < sizeof(mtuinfo)) 1314 return -EINVAL; 1315 1316 len = sizeof(mtuinfo); 1317 memset(&mtuinfo, 0, sizeof(mtuinfo)); 1318 1319 rcu_read_lock(); 1320 dst = __sk_dst_get(sk); 1321 if (dst) 1322 mtuinfo.ip6m_mtu = dst_mtu(dst); 1323 rcu_read_unlock(); 1324 if (!mtuinfo.ip6m_mtu) 1325 return -ENOTCONN; 1326 1327 if (put_user(len, optlen)) 1328 return -EFAULT; 1329 if (copy_to_user(optval, &mtuinfo, len)) 1330 return -EFAULT; 1331 1332 return 0; 1333 } 1334 1335 case IPV6_TRANSPARENT: 1336 val = inet_sk(sk)->transparent; 1337 break; 1338 1339 case IPV6_FREEBIND: 1340 val = inet_sk(sk)->freebind; 1341 break; 1342 1343 case IPV6_RECVORIGDSTADDR: 1344 val = np->rxopt.bits.rxorigdstaddr; 1345 break; 1346 1347 case IPV6_UNICAST_HOPS: 1348 case IPV6_MULTICAST_HOPS: 1349 { 1350 struct dst_entry *dst; 1351 1352 if (optname == IPV6_UNICAST_HOPS) 1353 val = np->hop_limit; 1354 else 1355 val = np->mcast_hops; 1356 1357 if (val < 0) { 1358 rcu_read_lock(); 1359 dst = __sk_dst_get(sk); 1360 if (dst) 1361 val = ip6_dst_hoplimit(dst); 1362 rcu_read_unlock(); 1363 } 1364 1365 if (val < 0) 1366 val = sock_net(sk)->ipv6.devconf_all->hop_limit; 1367 break; 1368 } 1369 1370 case IPV6_MULTICAST_LOOP: 1371 val = np->mc_loop; 1372 break; 1373 1374 case IPV6_MULTICAST_IF: 1375 val = np->mcast_oif; 1376 break; 1377 1378 case IPV6_MULTICAST_ALL: 1379 val = np->mc_all; 1380 break; 1381 1382 case IPV6_UNICAST_IF: 1383 val = (__force int)htonl((__u32) np->ucast_oif); 1384 break; 1385 1386 case IPV6_MTU_DISCOVER: 1387 val = np->pmtudisc; 1388 break; 1389 1390 case IPV6_RECVERR: 1391 val = np->recverr; 1392 break; 1393 1394 case IPV6_FLOWINFO_SEND: 1395 val = np->sndflow; 1396 break; 1397 1398 case IPV6_FLOWLABEL_MGR: 1399 { 1400 struct in6_flowlabel_req freq; 1401 int flags; 1402 1403 if (len < sizeof(freq)) 1404 return -EINVAL; 1405 1406 if (copy_from_user(&freq, optval, sizeof(freq))) 1407 return -EFAULT; 1408 1409 if (freq.flr_action != IPV6_FL_A_GET) 1410 return -EINVAL; 1411 1412 len = sizeof(freq); 1413 flags = freq.flr_flags; 1414 1415 memset(&freq, 0, sizeof(freq)); 1416 1417 val = ipv6_flowlabel_opt_get(sk, &freq, flags); 1418 if (val < 0) 1419 return val; 1420 1421 if (put_user(len, optlen)) 1422 return -EFAULT; 1423 if (copy_to_user(optval, &freq, len)) 1424 return -EFAULT; 1425 1426 return 0; 1427 } 1428 1429 case IPV6_ADDR_PREFERENCES: 1430 val = 0; 1431 1432 if (np->srcprefs & IPV6_PREFER_SRC_TMP) 1433 val |= IPV6_PREFER_SRC_TMP; 1434 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC) 1435 val |= IPV6_PREFER_SRC_PUBLIC; 1436 else { 1437 /* XXX: should we return system default? */ 1438 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT; 1439 } 1440 1441 if (np->srcprefs & IPV6_PREFER_SRC_COA) 1442 val |= IPV6_PREFER_SRC_COA; 1443 else 1444 val |= IPV6_PREFER_SRC_HOME; 1445 break; 1446 1447 case IPV6_MINHOPCOUNT: 1448 val = np->min_hopcount; 1449 break; 1450 1451 case IPV6_DONTFRAG: 1452 val = np->dontfrag; 1453 break; 1454 1455 case IPV6_AUTOFLOWLABEL: 1456 val = ip6_autoflowlabel(sock_net(sk), np); 1457 break; 1458 1459 case IPV6_RECVFRAGSIZE: 1460 val = np->rxopt.bits.recvfragsize; 1461 break; 1462 1463 case IPV6_ROUTER_ALERT_ISOLATE: 1464 val = np->rtalert_isolate; 1465 break; 1466 1467 case IPV6_RECVERR_RFC4884: 1468 val = np->recverr_rfc4884; 1469 break; 1470 1471 default: 1472 return -ENOPROTOOPT; 1473 } 1474 len = min_t(unsigned int, sizeof(int), len); 1475 if (put_user(len, optlen)) 1476 return -EFAULT; 1477 if (copy_to_user(optval, &val, len)) 1478 return -EFAULT; 1479 return 0; 1480 } 1481 1482 int ipv6_getsockopt(struct sock *sk, int level, int optname, 1483 char __user *optval, int __user *optlen) 1484 { 1485 int err; 1486 1487 if (level == SOL_IP && sk->sk_type != SOCK_RAW) 1488 return udp_prot.getsockopt(sk, level, optname, optval, optlen); 1489 1490 if (level != SOL_IPV6) 1491 return -ENOPROTOOPT; 1492 1493 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0); 1494 #ifdef CONFIG_NETFILTER 1495 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1496 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) { 1497 int len; 1498 1499 if (get_user(len, optlen)) 1500 return -EFAULT; 1501 1502 err = nf_getsockopt(sk, PF_INET6, optname, optval, &len); 1503 if (err >= 0) 1504 err = put_user(len, optlen); 1505 } 1506 #endif 1507 return err; 1508 } 1509 EXPORT_SYMBOL(ipv6_getsockopt); 1510