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 > READ_ONCE(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 > READ_ONCE(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 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 /* Another thread has converted the socket into IPv4 with 423 * IPV6_ADDRFORM concurrently. 424 */ 425 if (unlikely(sk->sk_family != AF_INET6)) 426 goto unlock; 427 428 switch (optname) { 429 430 case IPV6_ADDRFORM: 431 if (optlen < sizeof(int)) 432 goto e_inval; 433 if (val == PF_INET) { 434 struct ipv6_txoptions *opt; 435 struct sk_buff *pktopt; 436 437 if (sk->sk_type == SOCK_RAW) 438 break; 439 440 if (sk->sk_protocol == IPPROTO_UDP || 441 sk->sk_protocol == IPPROTO_UDPLITE) { 442 struct udp_sock *up = udp_sk(sk); 443 if (up->pending == AF_INET6) { 444 retv = -EBUSY; 445 break; 446 } 447 } else if (sk->sk_protocol == IPPROTO_TCP) { 448 if (sk->sk_prot != &tcpv6_prot) { 449 retv = -EBUSY; 450 break; 451 } 452 } else { 453 break; 454 } 455 456 if (sk->sk_state != TCP_ESTABLISHED) { 457 retv = -ENOTCONN; 458 break; 459 } 460 461 if (ipv6_only_sock(sk) || 462 !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) { 463 retv = -EADDRNOTAVAIL; 464 break; 465 } 466 467 fl6_free_socklist(sk); 468 __ipv6_sock_mc_close(sk); 469 __ipv6_sock_ac_close(sk); 470 471 /* 472 * Sock is moving from IPv6 to IPv4 (sk_prot), so 473 * remove it from the refcnt debug socks count in the 474 * original family... 475 */ 476 sk_refcnt_debug_dec(sk); 477 478 if (sk->sk_protocol == IPPROTO_TCP) { 479 struct inet_connection_sock *icsk = inet_csk(sk); 480 481 sock_prot_inuse_add(net, sk->sk_prot, -1); 482 sock_prot_inuse_add(net, &tcp_prot, 1); 483 484 /* Paired with READ_ONCE(sk->sk_prot) in net/ipv6/af_inet6.c */ 485 WRITE_ONCE(sk->sk_prot, &tcp_prot); 486 icsk->icsk_af_ops = &ipv4_specific; 487 sk->sk_socket->ops = &inet_stream_ops; 488 sk->sk_family = PF_INET; 489 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie); 490 } else { 491 struct proto *prot = &udp_prot; 492 493 if (sk->sk_protocol == IPPROTO_UDPLITE) 494 prot = &udplite_prot; 495 496 sock_prot_inuse_add(net, sk->sk_prot, -1); 497 sock_prot_inuse_add(net, prot, 1); 498 499 /* Paired with READ_ONCE(sk->sk_prot) in net/ipv6/af_inet6.c */ 500 WRITE_ONCE(sk->sk_prot, prot); 501 sk->sk_socket->ops = &inet_dgram_ops; 502 sk->sk_family = PF_INET; 503 } 504 opt = xchg((__force struct ipv6_txoptions **)&np->opt, 505 NULL); 506 if (opt) { 507 atomic_sub(opt->tot_len, &sk->sk_omem_alloc); 508 txopt_put(opt); 509 } 510 pktopt = xchg(&np->pktoptions, NULL); 511 kfree_skb(pktopt); 512 513 /* 514 * ... and add it to the refcnt debug socks count 515 * in the new family. -acme 516 */ 517 sk_refcnt_debug_inc(sk); 518 module_put(THIS_MODULE); 519 retv = 0; 520 break; 521 } 522 goto e_inval; 523 524 case IPV6_V6ONLY: 525 if (optlen < sizeof(int) || 526 inet_sk(sk)->inet_num) 527 goto e_inval; 528 sk->sk_ipv6only = valbool; 529 retv = 0; 530 break; 531 532 case IPV6_RECVPKTINFO: 533 if (optlen < sizeof(int)) 534 goto e_inval; 535 np->rxopt.bits.rxinfo = valbool; 536 retv = 0; 537 break; 538 539 case IPV6_2292PKTINFO: 540 if (optlen < sizeof(int)) 541 goto e_inval; 542 np->rxopt.bits.rxoinfo = valbool; 543 retv = 0; 544 break; 545 546 case IPV6_RECVHOPLIMIT: 547 if (optlen < sizeof(int)) 548 goto e_inval; 549 np->rxopt.bits.rxhlim = valbool; 550 retv = 0; 551 break; 552 553 case IPV6_2292HOPLIMIT: 554 if (optlen < sizeof(int)) 555 goto e_inval; 556 np->rxopt.bits.rxohlim = valbool; 557 retv = 0; 558 break; 559 560 case IPV6_RECVRTHDR: 561 if (optlen < sizeof(int)) 562 goto e_inval; 563 np->rxopt.bits.srcrt = valbool; 564 retv = 0; 565 break; 566 567 case IPV6_2292RTHDR: 568 if (optlen < sizeof(int)) 569 goto e_inval; 570 np->rxopt.bits.osrcrt = valbool; 571 retv = 0; 572 break; 573 574 case IPV6_RECVHOPOPTS: 575 if (optlen < sizeof(int)) 576 goto e_inval; 577 np->rxopt.bits.hopopts = valbool; 578 retv = 0; 579 break; 580 581 case IPV6_2292HOPOPTS: 582 if (optlen < sizeof(int)) 583 goto e_inval; 584 np->rxopt.bits.ohopopts = valbool; 585 retv = 0; 586 break; 587 588 case IPV6_RECVDSTOPTS: 589 if (optlen < sizeof(int)) 590 goto e_inval; 591 np->rxopt.bits.dstopts = valbool; 592 retv = 0; 593 break; 594 595 case IPV6_2292DSTOPTS: 596 if (optlen < sizeof(int)) 597 goto e_inval; 598 np->rxopt.bits.odstopts = valbool; 599 retv = 0; 600 break; 601 602 case IPV6_TCLASS: 603 if (optlen < sizeof(int)) 604 goto e_inval; 605 if (val < -1 || val > 0xff) 606 goto e_inval; 607 /* RFC 3542, 6.5: default traffic class of 0x0 */ 608 if (val == -1) 609 val = 0; 610 if (sk->sk_type == SOCK_STREAM) { 611 val &= ~INET_ECN_MASK; 612 val |= np->tclass & INET_ECN_MASK; 613 } 614 if (np->tclass != val) { 615 np->tclass = val; 616 sk_dst_reset(sk); 617 } 618 retv = 0; 619 break; 620 621 case IPV6_RECVTCLASS: 622 if (optlen < sizeof(int)) 623 goto e_inval; 624 np->rxopt.bits.rxtclass = valbool; 625 retv = 0; 626 break; 627 628 case IPV6_FLOWINFO: 629 if (optlen < sizeof(int)) 630 goto e_inval; 631 np->rxopt.bits.rxflow = valbool; 632 retv = 0; 633 break; 634 635 case IPV6_RECVPATHMTU: 636 if (optlen < sizeof(int)) 637 goto e_inval; 638 np->rxopt.bits.rxpmtu = valbool; 639 retv = 0; 640 break; 641 642 case IPV6_TRANSPARENT: 643 if (valbool && !sockopt_ns_capable(net->user_ns, CAP_NET_RAW) && 644 !sockopt_ns_capable(net->user_ns, CAP_NET_ADMIN)) { 645 retv = -EPERM; 646 break; 647 } 648 if (optlen < sizeof(int)) 649 goto e_inval; 650 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */ 651 inet_sk(sk)->transparent = valbool; 652 retv = 0; 653 break; 654 655 case IPV6_FREEBIND: 656 if (optlen < sizeof(int)) 657 goto e_inval; 658 /* we also don't have a separate freebind bit for IPV6 */ 659 inet_sk(sk)->freebind = valbool; 660 retv = 0; 661 break; 662 663 case IPV6_RECVORIGDSTADDR: 664 if (optlen < sizeof(int)) 665 goto e_inval; 666 np->rxopt.bits.rxorigdstaddr = valbool; 667 retv = 0; 668 break; 669 670 case IPV6_HOPOPTS: 671 case IPV6_RTHDRDSTOPTS: 672 case IPV6_RTHDR: 673 case IPV6_DSTOPTS: 674 retv = ipv6_set_opt_hdr(sk, optname, optval, optlen); 675 break; 676 677 case IPV6_PKTINFO: 678 { 679 struct in6_pktinfo pkt; 680 681 if (optlen == 0) 682 goto e_inval; 683 else if (optlen < sizeof(struct in6_pktinfo) || 684 sockptr_is_null(optval)) 685 goto e_inval; 686 687 if (copy_from_sockptr(&pkt, optval, sizeof(pkt))) { 688 retv = -EFAULT; 689 break; 690 } 691 if (!sk_dev_equal_l3scope(sk, pkt.ipi6_ifindex)) 692 goto e_inval; 693 694 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex; 695 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr; 696 retv = 0; 697 break; 698 } 699 700 case IPV6_2292PKTOPTIONS: 701 { 702 struct ipv6_txoptions *opt = NULL; 703 struct msghdr msg; 704 struct flowi6 fl6; 705 struct ipcm6_cookie ipc6; 706 707 memset(&fl6, 0, sizeof(fl6)); 708 fl6.flowi6_oif = sk->sk_bound_dev_if; 709 fl6.flowi6_mark = sk->sk_mark; 710 711 if (optlen == 0) 712 goto update; 713 714 /* 1K is probably excessive 715 * 1K is surely not enough, 2K per standard header is 16K. 716 */ 717 retv = -EINVAL; 718 if (optlen > 64*1024) 719 break; 720 721 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL); 722 retv = -ENOBUFS; 723 if (!opt) 724 break; 725 726 memset(opt, 0, sizeof(*opt)); 727 refcount_set(&opt->refcnt, 1); 728 opt->tot_len = sizeof(*opt) + optlen; 729 retv = -EFAULT; 730 if (copy_from_sockptr(opt + 1, optval, optlen)) 731 goto done; 732 733 msg.msg_controllen = optlen; 734 msg.msg_control = (void *)(opt+1); 735 ipc6.opt = opt; 736 737 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6); 738 if (retv) 739 goto done; 740 update: 741 retv = 0; 742 opt = ipv6_update_options(sk, opt); 743 done: 744 if (opt) { 745 atomic_sub(opt->tot_len, &sk->sk_omem_alloc); 746 txopt_put(opt); 747 } 748 break; 749 } 750 case IPV6_UNICAST_HOPS: 751 if (optlen < sizeof(int)) 752 goto e_inval; 753 if (val > 255 || val < -1) 754 goto e_inval; 755 np->hop_limit = val; 756 retv = 0; 757 break; 758 759 case IPV6_MULTICAST_HOPS: 760 if (sk->sk_type == SOCK_STREAM) 761 break; 762 if (optlen < sizeof(int)) 763 goto e_inval; 764 if (val > 255 || val < -1) 765 goto e_inval; 766 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val); 767 retv = 0; 768 break; 769 770 case IPV6_MULTICAST_LOOP: 771 if (optlen < sizeof(int)) 772 goto e_inval; 773 if (val != valbool) 774 goto e_inval; 775 np->mc_loop = valbool; 776 retv = 0; 777 break; 778 779 case IPV6_UNICAST_IF: 780 { 781 struct net_device *dev = NULL; 782 int ifindex; 783 784 if (optlen != sizeof(int)) 785 goto e_inval; 786 787 ifindex = (__force int)ntohl((__force __be32)val); 788 if (ifindex == 0) { 789 np->ucast_oif = 0; 790 retv = 0; 791 break; 792 } 793 794 dev = dev_get_by_index(net, ifindex); 795 retv = -EADDRNOTAVAIL; 796 if (!dev) 797 break; 798 dev_put(dev); 799 800 retv = -EINVAL; 801 if (sk->sk_bound_dev_if) 802 break; 803 804 np->ucast_oif = ifindex; 805 retv = 0; 806 break; 807 } 808 809 case IPV6_MULTICAST_IF: 810 if (sk->sk_type == SOCK_STREAM) 811 break; 812 if (optlen < sizeof(int)) 813 goto e_inval; 814 815 if (val) { 816 struct net_device *dev; 817 int midx; 818 819 rcu_read_lock(); 820 821 dev = dev_get_by_index_rcu(net, val); 822 if (!dev) { 823 rcu_read_unlock(); 824 retv = -ENODEV; 825 break; 826 } 827 midx = l3mdev_master_ifindex_rcu(dev); 828 829 rcu_read_unlock(); 830 831 if (sk->sk_bound_dev_if && 832 sk->sk_bound_dev_if != val && 833 (!midx || midx != sk->sk_bound_dev_if)) 834 goto e_inval; 835 } 836 np->mcast_oif = val; 837 retv = 0; 838 break; 839 case IPV6_ADD_MEMBERSHIP: 840 case IPV6_DROP_MEMBERSHIP: 841 { 842 struct ipv6_mreq mreq; 843 844 if (optlen < sizeof(struct ipv6_mreq)) 845 goto e_inval; 846 847 retv = -EPROTO; 848 if (inet_sk(sk)->is_icsk) 849 break; 850 851 retv = -EFAULT; 852 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq))) 853 break; 854 855 if (optname == IPV6_ADD_MEMBERSHIP) 856 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr); 857 else 858 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr); 859 break; 860 } 861 case IPV6_JOIN_ANYCAST: 862 case IPV6_LEAVE_ANYCAST: 863 { 864 struct ipv6_mreq mreq; 865 866 if (optlen < sizeof(struct ipv6_mreq)) 867 goto e_inval; 868 869 retv = -EFAULT; 870 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq))) 871 break; 872 873 if (optname == IPV6_JOIN_ANYCAST) 874 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr); 875 else 876 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr); 877 break; 878 } 879 case IPV6_MULTICAST_ALL: 880 if (optlen < sizeof(int)) 881 goto e_inval; 882 np->mc_all = valbool; 883 retv = 0; 884 break; 885 886 case MCAST_JOIN_GROUP: 887 case MCAST_LEAVE_GROUP: 888 if (in_compat_syscall()) 889 retv = compat_ipv6_mcast_join_leave(sk, optname, optval, 890 optlen); 891 else 892 retv = ipv6_mcast_join_leave(sk, optname, optval, 893 optlen); 894 break; 895 case MCAST_JOIN_SOURCE_GROUP: 896 case MCAST_LEAVE_SOURCE_GROUP: 897 case MCAST_BLOCK_SOURCE: 898 case MCAST_UNBLOCK_SOURCE: 899 retv = do_ipv6_mcast_group_source(sk, optname, optval, optlen); 900 break; 901 case MCAST_MSFILTER: 902 if (in_compat_syscall()) 903 retv = compat_ipv6_set_mcast_msfilter(sk, optval, 904 optlen); 905 else 906 retv = ipv6_set_mcast_msfilter(sk, optval, optlen); 907 break; 908 case IPV6_ROUTER_ALERT: 909 if (optlen < sizeof(int)) 910 goto e_inval; 911 retv = ip6_ra_control(sk, val); 912 break; 913 case IPV6_ROUTER_ALERT_ISOLATE: 914 if (optlen < sizeof(int)) 915 goto e_inval; 916 np->rtalert_isolate = valbool; 917 retv = 0; 918 break; 919 case IPV6_MTU_DISCOVER: 920 if (optlen < sizeof(int)) 921 goto e_inval; 922 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT) 923 goto e_inval; 924 np->pmtudisc = val; 925 retv = 0; 926 break; 927 case IPV6_MTU: 928 if (optlen < sizeof(int)) 929 goto e_inval; 930 if (val && val < IPV6_MIN_MTU) 931 goto e_inval; 932 np->frag_size = val; 933 retv = 0; 934 break; 935 case IPV6_RECVERR: 936 if (optlen < sizeof(int)) 937 goto e_inval; 938 np->recverr = valbool; 939 if (!val) 940 skb_queue_purge(&sk->sk_error_queue); 941 retv = 0; 942 break; 943 case IPV6_FLOWINFO_SEND: 944 if (optlen < sizeof(int)) 945 goto e_inval; 946 np->sndflow = valbool; 947 retv = 0; 948 break; 949 case IPV6_FLOWLABEL_MGR: 950 retv = ipv6_flowlabel_opt(sk, optval, optlen); 951 break; 952 case IPV6_IPSEC_POLICY: 953 case IPV6_XFRM_POLICY: 954 retv = -EPERM; 955 if (!sockopt_ns_capable(net->user_ns, CAP_NET_ADMIN)) 956 break; 957 retv = xfrm_user_policy(sk, optname, optval, optlen); 958 break; 959 960 case IPV6_ADDR_PREFERENCES: 961 if (optlen < sizeof(int)) 962 goto e_inval; 963 retv = __ip6_sock_set_addr_preferences(sk, val); 964 break; 965 case IPV6_MINHOPCOUNT: 966 if (optlen < sizeof(int)) 967 goto e_inval; 968 if (val < 0 || val > 255) 969 goto e_inval; 970 971 if (val) 972 static_branch_enable(&ip6_min_hopcount); 973 974 /* tcp_v6_err() and tcp_v6_rcv() might read min_hopcount 975 * while we are changing it. 976 */ 977 WRITE_ONCE(np->min_hopcount, val); 978 retv = 0; 979 break; 980 case IPV6_DONTFRAG: 981 np->dontfrag = valbool; 982 retv = 0; 983 break; 984 case IPV6_AUTOFLOWLABEL: 985 np->autoflowlabel = valbool; 986 np->autoflowlabel_set = 1; 987 retv = 0; 988 break; 989 case IPV6_RECVFRAGSIZE: 990 np->rxopt.bits.recvfragsize = valbool; 991 retv = 0; 992 break; 993 case IPV6_RECVERR_RFC4884: 994 if (optlen < sizeof(int)) 995 goto e_inval; 996 if (val < 0 || val > 1) 997 goto e_inval; 998 np->recverr_rfc4884 = valbool; 999 retv = 0; 1000 break; 1001 } 1002 1003 unlock: 1004 sockopt_release_sock(sk); 1005 if (needs_rtnl) 1006 rtnl_unlock(); 1007 1008 return retv; 1009 1010 e_inval: 1011 sockopt_release_sock(sk); 1012 if (needs_rtnl) 1013 rtnl_unlock(); 1014 return -EINVAL; 1015 } 1016 1017 int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, 1018 unsigned int optlen) 1019 { 1020 int err; 1021 1022 if (level == SOL_IP && sk->sk_type != SOCK_RAW) 1023 return udp_prot.setsockopt(sk, level, optname, optval, optlen); 1024 1025 if (level != SOL_IPV6) 1026 return -ENOPROTOOPT; 1027 1028 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen); 1029 #ifdef CONFIG_NETFILTER 1030 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1031 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY && 1032 optname != IPV6_XFRM_POLICY) 1033 err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen); 1034 #endif 1035 return err; 1036 } 1037 EXPORT_SYMBOL(ipv6_setsockopt); 1038 1039 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt, 1040 int optname, sockptr_t optval, int len) 1041 { 1042 struct ipv6_opt_hdr *hdr; 1043 1044 if (!opt) 1045 return 0; 1046 1047 switch (optname) { 1048 case IPV6_HOPOPTS: 1049 hdr = opt->hopopt; 1050 break; 1051 case IPV6_RTHDRDSTOPTS: 1052 hdr = opt->dst0opt; 1053 break; 1054 case IPV6_RTHDR: 1055 hdr = (struct ipv6_opt_hdr *)opt->srcrt; 1056 break; 1057 case IPV6_DSTOPTS: 1058 hdr = opt->dst1opt; 1059 break; 1060 default: 1061 return -EINVAL; /* should not happen */ 1062 } 1063 1064 if (!hdr) 1065 return 0; 1066 1067 len = min_t(unsigned int, len, ipv6_optlen(hdr)); 1068 if (copy_to_sockptr(optval, hdr, len)) 1069 return -EFAULT; 1070 return len; 1071 } 1072 1073 static int ipv6_get_msfilter(struct sock *sk, sockptr_t optval, 1074 sockptr_t optlen, int len) 1075 { 1076 const int size0 = offsetof(struct group_filter, gf_slist_flex); 1077 struct group_filter gsf; 1078 int num; 1079 int err; 1080 1081 if (len < size0) 1082 return -EINVAL; 1083 if (copy_from_sockptr(&gsf, optval, size0)) 1084 return -EFAULT; 1085 if (gsf.gf_group.ss_family != AF_INET6) 1086 return -EADDRNOTAVAIL; 1087 num = gsf.gf_numsrc; 1088 sockopt_lock_sock(sk); 1089 err = ip6_mc_msfget(sk, &gsf, optval, size0); 1090 if (!err) { 1091 if (num > gsf.gf_numsrc) 1092 num = gsf.gf_numsrc; 1093 len = GROUP_FILTER_SIZE(num); 1094 if (copy_to_sockptr(optlen, &len, sizeof(int)) || 1095 copy_to_sockptr(optval, &gsf, size0)) 1096 err = -EFAULT; 1097 } 1098 sockopt_release_sock(sk); 1099 return err; 1100 } 1101 1102 static int compat_ipv6_get_msfilter(struct sock *sk, sockptr_t optval, 1103 sockptr_t optlen, int len) 1104 { 1105 const int size0 = offsetof(struct compat_group_filter, gf_slist_flex); 1106 struct compat_group_filter gf32; 1107 struct group_filter gf; 1108 int err; 1109 int num; 1110 1111 if (len < size0) 1112 return -EINVAL; 1113 1114 if (copy_from_sockptr(&gf32, optval, size0)) 1115 return -EFAULT; 1116 gf.gf_interface = gf32.gf_interface; 1117 gf.gf_fmode = gf32.gf_fmode; 1118 num = gf.gf_numsrc = gf32.gf_numsrc; 1119 gf.gf_group = gf32.gf_group; 1120 1121 if (gf.gf_group.ss_family != AF_INET6) 1122 return -EADDRNOTAVAIL; 1123 1124 sockopt_lock_sock(sk); 1125 err = ip6_mc_msfget(sk, &gf, optval, size0); 1126 sockopt_release_sock(sk); 1127 if (err) 1128 return err; 1129 if (num > gf.gf_numsrc) 1130 num = gf.gf_numsrc; 1131 len = GROUP_FILTER_SIZE(num) - (sizeof(gf)-sizeof(gf32)); 1132 if (copy_to_sockptr(optlen, &len, sizeof(int)) || 1133 copy_to_sockptr_offset(optval, offsetof(struct compat_group_filter, gf_fmode), 1134 &gf.gf_fmode, sizeof(gf32.gf_fmode)) || 1135 copy_to_sockptr_offset(optval, offsetof(struct compat_group_filter, gf_numsrc), 1136 &gf.gf_numsrc, sizeof(gf32.gf_numsrc))) 1137 return -EFAULT; 1138 return 0; 1139 } 1140 1141 int do_ipv6_getsockopt(struct sock *sk, int level, int optname, 1142 sockptr_t optval, sockptr_t optlen) 1143 { 1144 struct ipv6_pinfo *np = inet6_sk(sk); 1145 int len; 1146 int val; 1147 1148 if (ip6_mroute_opt(optname)) 1149 return ip6_mroute_getsockopt(sk, optname, optval, optlen); 1150 1151 if (copy_from_sockptr(&len, optlen, sizeof(int))) 1152 return -EFAULT; 1153 switch (optname) { 1154 case IPV6_ADDRFORM: 1155 if (sk->sk_protocol != IPPROTO_UDP && 1156 sk->sk_protocol != IPPROTO_UDPLITE && 1157 sk->sk_protocol != IPPROTO_TCP) 1158 return -ENOPROTOOPT; 1159 if (sk->sk_state != TCP_ESTABLISHED) 1160 return -ENOTCONN; 1161 val = sk->sk_family; 1162 break; 1163 case MCAST_MSFILTER: 1164 if (in_compat_syscall()) 1165 return compat_ipv6_get_msfilter(sk, optval, optlen, len); 1166 return ipv6_get_msfilter(sk, optval, optlen, len); 1167 case IPV6_2292PKTOPTIONS: 1168 { 1169 struct msghdr msg; 1170 struct sk_buff *skb; 1171 1172 if (sk->sk_type != SOCK_STREAM) 1173 return -ENOPROTOOPT; 1174 1175 if (optval.is_kernel) { 1176 msg.msg_control_is_user = false; 1177 msg.msg_control = optval.kernel; 1178 } else { 1179 msg.msg_control_is_user = true; 1180 msg.msg_control_user = optval.user; 1181 } 1182 msg.msg_controllen = len; 1183 msg.msg_flags = 0; 1184 1185 sockopt_lock_sock(sk); 1186 skb = np->pktoptions; 1187 if (skb) 1188 ip6_datagram_recv_ctl(sk, &msg, skb); 1189 sockopt_release_sock(sk); 1190 if (!skb) { 1191 if (np->rxopt.bits.rxinfo) { 1192 struct in6_pktinfo src_info; 1193 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif : 1194 np->sticky_pktinfo.ipi6_ifindex; 1195 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr; 1196 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info); 1197 } 1198 if (np->rxopt.bits.rxhlim) { 1199 int hlim = np->mcast_hops; 1200 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); 1201 } 1202 if (np->rxopt.bits.rxtclass) { 1203 int tclass = (int)ip6_tclass(np->rcv_flowinfo); 1204 1205 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass); 1206 } 1207 if (np->rxopt.bits.rxoinfo) { 1208 struct in6_pktinfo src_info; 1209 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif : 1210 np->sticky_pktinfo.ipi6_ifindex; 1211 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : 1212 np->sticky_pktinfo.ipi6_addr; 1213 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); 1214 } 1215 if (np->rxopt.bits.rxohlim) { 1216 int hlim = np->mcast_hops; 1217 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); 1218 } 1219 if (np->rxopt.bits.rxflow) { 1220 __be32 flowinfo = np->rcv_flowinfo; 1221 1222 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo); 1223 } 1224 } 1225 len -= msg.msg_controllen; 1226 return copy_to_sockptr(optlen, &len, sizeof(int)); 1227 } 1228 case IPV6_MTU: 1229 { 1230 struct dst_entry *dst; 1231 1232 val = 0; 1233 rcu_read_lock(); 1234 dst = __sk_dst_get(sk); 1235 if (dst) 1236 val = dst_mtu(dst); 1237 rcu_read_unlock(); 1238 if (!val) 1239 return -ENOTCONN; 1240 break; 1241 } 1242 1243 case IPV6_V6ONLY: 1244 val = sk->sk_ipv6only; 1245 break; 1246 1247 case IPV6_RECVPKTINFO: 1248 val = np->rxopt.bits.rxinfo; 1249 break; 1250 1251 case IPV6_2292PKTINFO: 1252 val = np->rxopt.bits.rxoinfo; 1253 break; 1254 1255 case IPV6_RECVHOPLIMIT: 1256 val = np->rxopt.bits.rxhlim; 1257 break; 1258 1259 case IPV6_2292HOPLIMIT: 1260 val = np->rxopt.bits.rxohlim; 1261 break; 1262 1263 case IPV6_RECVRTHDR: 1264 val = np->rxopt.bits.srcrt; 1265 break; 1266 1267 case IPV6_2292RTHDR: 1268 val = np->rxopt.bits.osrcrt; 1269 break; 1270 1271 case IPV6_HOPOPTS: 1272 case IPV6_RTHDRDSTOPTS: 1273 case IPV6_RTHDR: 1274 case IPV6_DSTOPTS: 1275 { 1276 struct ipv6_txoptions *opt; 1277 1278 sockopt_lock_sock(sk); 1279 opt = rcu_dereference_protected(np->opt, 1280 lockdep_sock_is_held(sk)); 1281 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len); 1282 sockopt_release_sock(sk); 1283 /* check if ipv6_getsockopt_sticky() returns err code */ 1284 if (len < 0) 1285 return len; 1286 return copy_to_sockptr(optlen, &len, sizeof(int)); 1287 } 1288 1289 case IPV6_RECVHOPOPTS: 1290 val = np->rxopt.bits.hopopts; 1291 break; 1292 1293 case IPV6_2292HOPOPTS: 1294 val = np->rxopt.bits.ohopopts; 1295 break; 1296 1297 case IPV6_RECVDSTOPTS: 1298 val = np->rxopt.bits.dstopts; 1299 break; 1300 1301 case IPV6_2292DSTOPTS: 1302 val = np->rxopt.bits.odstopts; 1303 break; 1304 1305 case IPV6_TCLASS: 1306 val = np->tclass; 1307 break; 1308 1309 case IPV6_RECVTCLASS: 1310 val = np->rxopt.bits.rxtclass; 1311 break; 1312 1313 case IPV6_FLOWINFO: 1314 val = np->rxopt.bits.rxflow; 1315 break; 1316 1317 case IPV6_RECVPATHMTU: 1318 val = np->rxopt.bits.rxpmtu; 1319 break; 1320 1321 case IPV6_PATHMTU: 1322 { 1323 struct dst_entry *dst; 1324 struct ip6_mtuinfo mtuinfo; 1325 1326 if (len < sizeof(mtuinfo)) 1327 return -EINVAL; 1328 1329 len = sizeof(mtuinfo); 1330 memset(&mtuinfo, 0, sizeof(mtuinfo)); 1331 1332 rcu_read_lock(); 1333 dst = __sk_dst_get(sk); 1334 if (dst) 1335 mtuinfo.ip6m_mtu = dst_mtu(dst); 1336 rcu_read_unlock(); 1337 if (!mtuinfo.ip6m_mtu) 1338 return -ENOTCONN; 1339 1340 if (copy_to_sockptr(optlen, &len, sizeof(int))) 1341 return -EFAULT; 1342 if (copy_to_sockptr(optval, &mtuinfo, len)) 1343 return -EFAULT; 1344 1345 return 0; 1346 } 1347 1348 case IPV6_TRANSPARENT: 1349 val = inet_sk(sk)->transparent; 1350 break; 1351 1352 case IPV6_FREEBIND: 1353 val = inet_sk(sk)->freebind; 1354 break; 1355 1356 case IPV6_RECVORIGDSTADDR: 1357 val = np->rxopt.bits.rxorigdstaddr; 1358 break; 1359 1360 case IPV6_UNICAST_HOPS: 1361 case IPV6_MULTICAST_HOPS: 1362 { 1363 struct dst_entry *dst; 1364 1365 if (optname == IPV6_UNICAST_HOPS) 1366 val = np->hop_limit; 1367 else 1368 val = np->mcast_hops; 1369 1370 if (val < 0) { 1371 rcu_read_lock(); 1372 dst = __sk_dst_get(sk); 1373 if (dst) 1374 val = ip6_dst_hoplimit(dst); 1375 rcu_read_unlock(); 1376 } 1377 1378 if (val < 0) 1379 val = sock_net(sk)->ipv6.devconf_all->hop_limit; 1380 break; 1381 } 1382 1383 case IPV6_MULTICAST_LOOP: 1384 val = np->mc_loop; 1385 break; 1386 1387 case IPV6_MULTICAST_IF: 1388 val = np->mcast_oif; 1389 break; 1390 1391 case IPV6_MULTICAST_ALL: 1392 val = np->mc_all; 1393 break; 1394 1395 case IPV6_UNICAST_IF: 1396 val = (__force int)htonl((__u32) np->ucast_oif); 1397 break; 1398 1399 case IPV6_MTU_DISCOVER: 1400 val = np->pmtudisc; 1401 break; 1402 1403 case IPV6_RECVERR: 1404 val = np->recverr; 1405 break; 1406 1407 case IPV6_FLOWINFO_SEND: 1408 val = np->sndflow; 1409 break; 1410 1411 case IPV6_FLOWLABEL_MGR: 1412 { 1413 struct in6_flowlabel_req freq; 1414 int flags; 1415 1416 if (len < sizeof(freq)) 1417 return -EINVAL; 1418 1419 if (copy_from_sockptr(&freq, optval, sizeof(freq))) 1420 return -EFAULT; 1421 1422 if (freq.flr_action != IPV6_FL_A_GET) 1423 return -EINVAL; 1424 1425 len = sizeof(freq); 1426 flags = freq.flr_flags; 1427 1428 memset(&freq, 0, sizeof(freq)); 1429 1430 val = ipv6_flowlabel_opt_get(sk, &freq, flags); 1431 if (val < 0) 1432 return val; 1433 1434 if (copy_to_sockptr(optlen, &len, sizeof(int))) 1435 return -EFAULT; 1436 if (copy_to_sockptr(optval, &freq, len)) 1437 return -EFAULT; 1438 1439 return 0; 1440 } 1441 1442 case IPV6_ADDR_PREFERENCES: 1443 val = 0; 1444 1445 if (np->srcprefs & IPV6_PREFER_SRC_TMP) 1446 val |= IPV6_PREFER_SRC_TMP; 1447 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC) 1448 val |= IPV6_PREFER_SRC_PUBLIC; 1449 else { 1450 /* XXX: should we return system default? */ 1451 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT; 1452 } 1453 1454 if (np->srcprefs & IPV6_PREFER_SRC_COA) 1455 val |= IPV6_PREFER_SRC_COA; 1456 else 1457 val |= IPV6_PREFER_SRC_HOME; 1458 break; 1459 1460 case IPV6_MINHOPCOUNT: 1461 val = np->min_hopcount; 1462 break; 1463 1464 case IPV6_DONTFRAG: 1465 val = np->dontfrag; 1466 break; 1467 1468 case IPV6_AUTOFLOWLABEL: 1469 val = ip6_autoflowlabel(sock_net(sk), np); 1470 break; 1471 1472 case IPV6_RECVFRAGSIZE: 1473 val = np->rxopt.bits.recvfragsize; 1474 break; 1475 1476 case IPV6_ROUTER_ALERT_ISOLATE: 1477 val = np->rtalert_isolate; 1478 break; 1479 1480 case IPV6_RECVERR_RFC4884: 1481 val = np->recverr_rfc4884; 1482 break; 1483 1484 default: 1485 return -ENOPROTOOPT; 1486 } 1487 len = min_t(unsigned int, sizeof(int), len); 1488 if (copy_to_sockptr(optlen, &len, sizeof(int))) 1489 return -EFAULT; 1490 if (copy_to_sockptr(optval, &val, len)) 1491 return -EFAULT; 1492 return 0; 1493 } 1494 1495 int ipv6_getsockopt(struct sock *sk, int level, int optname, 1496 char __user *optval, int __user *optlen) 1497 { 1498 int err; 1499 1500 if (level == SOL_IP && sk->sk_type != SOCK_RAW) 1501 return udp_prot.getsockopt(sk, level, optname, optval, optlen); 1502 1503 if (level != SOL_IPV6) 1504 return -ENOPROTOOPT; 1505 1506 err = do_ipv6_getsockopt(sk, level, optname, 1507 USER_SOCKPTR(optval), USER_SOCKPTR(optlen)); 1508 #ifdef CONFIG_NETFILTER 1509 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1510 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) { 1511 int len; 1512 1513 if (get_user(len, optlen)) 1514 return -EFAULT; 1515 1516 err = nf_getsockopt(sk, PF_INET6, optname, optval, &len); 1517 if (err >= 0) 1518 err = put_user(len, optlen); 1519 } 1520 #endif 1521 return err; 1522 } 1523 EXPORT_SYMBOL(ipv6_getsockopt); 1524