/net/ipv6/ipv6_sockglue.c

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 *	IPv6 BSD socket options interface
   4 *	Linux INET6 implementation
   5 *
   6 *	Authors:
   7 *	Pedro Roque		<roque@di.fc.ul.pt>
   8 *
   9 *	Based on linux/net/ipv4/ip_sockglue.c
  10 *
  11 *	FIXME: Make the setsockopt code POSIX compliant: That is
  12 *
  13 *	o	Truncate getsockopt returns
  14 *	o	Return an optlen of the truncated length if need be
  15 *
  16 *	Changes:
  17 *	David L Stevens <dlstevens@us.ibm.com>:
  18 *		- added multicast source filtering API for MLDv2
  19 */
  20
  21#include <linux/module.h>
  22#include <linux/capability.h>
  23#include <linux/errno.h>
  24#include <linux/types.h>
  25#include <linux/socket.h>
  26#include <linux/sockios.h>
  27#include <linux/net.h>
  28#include <linux/in6.h>
  29#include <linux/mroute6.h>
  30#include <linux/netdevice.h>
  31#include <linux/if_arp.h>
  32#include <linux/init.h>
  33#include <linux/sysctl.h>
  34#include <linux/netfilter.h>
  35#include <linux/slab.h>
  36
  37#include <net/sock.h>
  38#include <net/snmp.h>
  39#include <net/ipv6.h>
  40#include <net/ndisc.h>
  41#include <net/protocol.h>
  42#include <net/transp_v6.h>
  43#include <net/ip6_route.h>
  44#include <net/addrconf.h>
  45#include <net/inet_common.h>
  46#include <net/tcp.h>
  47#include <net/udp.h>
  48#include <net/udplite.h>
  49#include <net/xfrm.h>
  50#include <net/compat.h>
  51#include <net/seg6.h>
  52
  53#include <linux/uaccess.h>
  54
  55struct ip6_ra_chain *ip6_ra_chain;
  56DEFINE_RWLOCK(ip6_ra_lock);
  57
  58int ip6_ra_control(struct sock *sk, int sel)
  59{
  60	struct ip6_ra_chain *ra, *new_ra, **rap;
  61
  62	/* RA packet may be delivered ONLY to IPPROTO_RAW socket */
  63	if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num != IPPROTO_RAW)
  64		return -ENOPROTOOPT;
  65
  66	new_ra = (sel >= 0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
  67	if (sel >= 0 && !new_ra)
  68		return -ENOMEM;
  69
  70	write_lock_bh(&ip6_ra_lock);
  71	for (rap = &ip6_ra_chain; (ra = *rap) != NULL; rap = &ra->next) {
  72		if (ra->sk == sk) {
  73			if (sel >= 0) {
  74				write_unlock_bh(&ip6_ra_lock);
  75				kfree(new_ra);
  76				return -EADDRINUSE;
  77			}
  78
  79			*rap = ra->next;
  80			write_unlock_bh(&ip6_ra_lock);
  81
  82			sock_put(sk);
  83			kfree(ra);
  84			return 0;
  85		}
  86	}
  87	if (!new_ra) {
  88		write_unlock_bh(&ip6_ra_lock);
  89		return -ENOBUFS;
  90	}
  91	new_ra->sk = sk;
  92	new_ra->sel = sel;
  93	new_ra->next = ra;
  94	*rap = new_ra;
  95	sock_hold(sk);
  96	write_unlock_bh(&ip6_ra_lock);
  97	return 0;
  98}
  99
 100struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
 101					   struct ipv6_txoptions *opt)
 102{
 103	if (inet_sk(sk)->is_icsk) {
 104		if (opt &&
 105		    !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
 106		    inet_sk(sk)->inet_daddr != LOOPBACK4_IPV6) {
 107			struct inet_connection_sock *icsk = inet_csk(sk);
 108			icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
 109			icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
 110		}
 111	}
 112	opt = xchg((__force struct ipv6_txoptions **)&inet6_sk(sk)->opt,
 113		   opt);
 114	sk_dst_reset(sk);
 115
 116	return opt;
 117}
 118
 119static bool setsockopt_needs_rtnl(int optname)
 120{
 121	switch (optname) {
 122	case IPV6_ADDRFORM:
 123	case IPV6_ADD_MEMBERSHIP:
 124	case IPV6_DROP_MEMBERSHIP:
 125	case IPV6_JOIN_ANYCAST:
 126	case IPV6_LEAVE_ANYCAST:
 127	case MCAST_JOIN_GROUP:
 128	case MCAST_LEAVE_GROUP:
 129	case MCAST_JOIN_SOURCE_GROUP:
 130	case MCAST_LEAVE_SOURCE_GROUP:
 131	case MCAST_BLOCK_SOURCE:
 132	case MCAST_UNBLOCK_SOURCE:
 133	case MCAST_MSFILTER:
 134		return true;
 135	}
 136	return false;
 137}
 138
 139static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
 140		    char __user *optval, unsigned int optlen)
 141{
 142	struct ipv6_pinfo *np = inet6_sk(sk);
 143	struct net *net = sock_net(sk);
 144	int val, valbool;
 145	int retv = -ENOPROTOOPT;
 146	bool needs_rtnl = setsockopt_needs_rtnl(optname);
 147
 148	if (!optval)
 149		val = 0;
 150	else {
 151		if (optlen >= sizeof(int)) {
 152			if (get_user(val, (int __user *) optval))
 153				return -EFAULT;
 154		} else
 155			val = 0;
 156	}
 157
 158	valbool = (val != 0);
 159
 160	if (ip6_mroute_opt(optname))
 161		return ip6_mroute_setsockopt(sk, optname, optval, optlen);
 162
 163	if (needs_rtnl)
 164		rtnl_lock();
 165	lock_sock(sk);
 166
 167	switch (optname) {
 168
 169	case IPV6_ADDRFORM:
 170		if (optlen < sizeof(int))
 171			goto e_inval;
 172		if (val == PF_INET) {
 173			struct ipv6_txoptions *opt;
 174			struct sk_buff *pktopt;
 175
 176			if (sk->sk_type == SOCK_RAW)
 177				break;
 178
 179			if (sk->sk_protocol == IPPROTO_UDP ||
 180			    sk->sk_protocol == IPPROTO_UDPLITE) {
 181				struct udp_sock *up = udp_sk(sk);
 182				if (up->pending == AF_INET6) {
 183					retv = -EBUSY;
 184					break;
 185				}
 186			}
 187			if (sk->sk_protocol == IPPROTO_TCP &&
 188			    sk->sk_prot != &tcpv6_prot) {
 189				retv = -EBUSY;
 190				break;
 191			}
 192			if (sk->sk_protocol != IPPROTO_TCP)
 193				break;
 194			if (sk->sk_state != TCP_ESTABLISHED) {
 195				retv = -ENOTCONN;
 196				break;
 197			}
 198
 199			if (ipv6_only_sock(sk) ||
 200			    !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) {
 201				retv = -EADDRNOTAVAIL;
 202				break;
 203			}
 204
 205			fl6_free_socklist(sk);
 206			__ipv6_sock_mc_close(sk);
 207
 208			/*
 209			 * Sock is moving from IPv6 to IPv4 (sk_prot), so
 210			 * remove it from the refcnt debug socks count in the
 211			 * original family...
 212			 */
 213			sk_refcnt_debug_dec(sk);
 214
 215			if (sk->sk_protocol == IPPROTO_TCP) {
 216				struct inet_connection_sock *icsk = inet_csk(sk);
 217				local_bh_disable();
 218				sock_prot_inuse_add(net, sk->sk_prot, -1);
 219				sock_prot_inuse_add(net, &tcp_prot, 1);
 220				local_bh_enable();
 221				sk->sk_prot = &tcp_prot;
 222				icsk->icsk_af_ops = &ipv4_specific;
 223				sk->sk_socket->ops = &inet_stream_ops;
 224				sk->sk_family = PF_INET;
 225				tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
 226			} else {
 227				struct proto *prot = &udp_prot;
 228
 229				if (sk->sk_protocol == IPPROTO_UDPLITE)
 230					prot = &udplite_prot;
 231				local_bh_disable();
 232				sock_prot_inuse_add(net, sk->sk_prot, -1);
 233				sock_prot_inuse_add(net, prot, 1);
 234				local_bh_enable();
 235				sk->sk_prot = prot;
 236				sk->sk_socket->ops = &inet_dgram_ops;
 237				sk->sk_family = PF_INET;
 238			}
 239			opt = xchg((__force struct ipv6_txoptions **)&np->opt,
 240				   NULL);
 241			if (opt) {
 242				atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
 243				txopt_put(opt);
 244			}
 245			pktopt = xchg(&np->pktoptions, NULL);
 246			kfree_skb(pktopt);
 247
 248			/*
 249			 * ... and add it to the refcnt debug socks count
 250			 * in the new family. -acme
 251			 */
 252			sk_refcnt_debug_inc(sk);
 253			module_put(THIS_MODULE);
 254			retv = 0;
 255			break;
 256		}
 257		goto e_inval;
 258
 259	case IPV6_V6ONLY:
 260		if (optlen < sizeof(int) ||
 261		    inet_sk(sk)->inet_num)
 262			goto e_inval;
 263		sk->sk_ipv6only = valbool;
 264		retv = 0;
 265		break;
 266
 267	case IPV6_RECVPKTINFO:
 268		if (optlen < sizeof(int))
 269			goto e_inval;
 270		np->rxopt.bits.rxinfo = valbool;
 271		retv = 0;
 272		break;
 273
 274	case IPV6_2292PKTINFO:
 275		if (optlen < sizeof(int))
 276			goto e_inval;
 277		np->rxopt.bits.rxoinfo = valbool;
 278		retv = 0;
 279		break;
 280
 281	case IPV6_RECVHOPLIMIT:
 282		if (optlen < sizeof(int))
 283			goto e_inval;
 284		np->rxopt.bits.rxhlim = valbool;
 285		retv = 0;
 286		break;
 287
 288	case IPV6_2292HOPLIMIT:
 289		if (optlen < sizeof(int))
 290			goto e_inval;
 291		np->rxopt.bits.rxohlim = valbool;
 292		retv = 0;
 293		break;
 294
 295	case IPV6_RECVRTHDR:
 296		if (optlen < sizeof(int))
 297			goto e_inval;
 298		np->rxopt.bits.srcrt = valbool;
 299		retv = 0;
 300		break;
 301
 302	case IPV6_2292RTHDR:
 303		if (optlen < sizeof(int))
 304			goto e_inval;
 305		np->rxopt.bits.osrcrt = valbool;
 306		retv = 0;
 307		break;
 308
 309	case IPV6_RECVHOPOPTS:
 310		if (optlen < sizeof(int))
 311			goto e_inval;
 312		np->rxopt.bits.hopopts = valbool;
 313		retv = 0;
 314		break;
 315
 316	case IPV6_2292HOPOPTS:
 317		if (optlen < sizeof(int))
 318			goto e_inval;
 319		np->rxopt.bits.ohopopts = valbool;
 320		retv = 0;
 321		break;
 322
 323	case IPV6_RECVDSTOPTS:
 324		if (optlen < sizeof(int))
 325			goto e_inval;
 326		np->rxopt.bits.dstopts = valbool;
 327		retv = 0;
 328		break;
 329
 330	case IPV6_2292DSTOPTS:
 331		if (optlen < sizeof(int))
 332			goto e_inval;
 333		np->rxopt.bits.odstopts = valbool;
 334		retv = 0;
 335		break;
 336
 337	case IPV6_TCLASS:
 338		if (optlen < sizeof(int))
 339			goto e_inval;
 340		if (val < -1 || val > 0xff)
 341			goto e_inval;
 342		/* RFC 3542, 6.5: default traffic class of 0x0 */
 343		if (val == -1)
 344			val = 0;
 345		np->tclass = val;
 346		retv = 0;
 347		break;
 348
 349	case IPV6_RECVTCLASS:
 350		if (optlen < sizeof(int))
 351			goto e_inval;
 352		np->rxopt.bits.rxtclass = valbool;
 353		retv = 0;
 354		break;
 355
 356	case IPV6_FLOWINFO:
 357		if (optlen < sizeof(int))
 358			goto e_inval;
 359		np->rxopt.bits.rxflow = valbool;
 360		retv = 0;
 361		break;
 362
 363	case IPV6_RECVPATHMTU:
 364		if (optlen < sizeof(int))
 365			goto e_inval;
 366		np->rxopt.bits.rxpmtu = valbool;
 367		retv = 0;
 368		break;
 369
 370	case IPV6_TRANSPARENT:
 371		if (valbool && !ns_capable(net->user_ns, CAP_NET_RAW) &&
 372		    !ns_capable(net->user_ns, CAP_NET_ADMIN)) {
 373			retv = -EPERM;
 374			break;
 375		}
 376		if (optlen < sizeof(int))
 377			goto e_inval;
 378		/* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */
 379		inet_sk(sk)->transparent = valbool;
 380		retv = 0;
 381		break;
 382
 383	case IPV6_FREEBIND:
 384		if (optlen < sizeof(int))
 385			goto e_inval;
 386		/* we also don't have a separate freebind bit for IPV6 */
 387		inet_sk(sk)->freebind = valbool;
 388		retv = 0;
 389		break;
 390
 391	case IPV6_RECVORIGDSTADDR:
 392		if (optlen < sizeof(int))
 393			goto e_inval;
 394		np->rxopt.bits.rxorigdstaddr = valbool;
 395		retv = 0;
 396		break;
 397
 398	case IPV6_HOPOPTS:
 399	case IPV6_RTHDRDSTOPTS:
 400	case IPV6_RTHDR:
 401	case IPV6_DSTOPTS:
 402	{
 403		struct ipv6_txoptions *opt;
 404		struct ipv6_opt_hdr *new = NULL;
 405
 406		/* hop-by-hop / destination options are privileged option */
 407		retv = -EPERM;
 408		if (optname != IPV6_RTHDR && !ns_capable(net->user_ns, CAP_NET_RAW))
 409			break;
 410
 411		/* remove any sticky options header with a zero option
 412		 * length, per RFC3542.
 413		 */
 414		if (optlen == 0)
 415			optval = NULL;
 416		else if (!optval)
 417			goto e_inval;
 418		else if (optlen < sizeof(struct ipv6_opt_hdr) ||
 419			 optlen & 0x7 || optlen > 8 * 255)
 420			goto e_inval;
 421		else {
 422			new = memdup_user(optval, optlen);
 423			if (IS_ERR(new)) {
 424				retv = PTR_ERR(new);
 425				break;
 426			}
 427			if (unlikely(ipv6_optlen(new) > optlen)) {
 428				kfree(new);
 429				goto e_inval;
 430			}
 431		}
 432
 433		opt = rcu_dereference_protected(np->opt,
 434						lockdep_sock_is_held(sk));
 435		opt = ipv6_renew_options(sk, opt, optname, new);
 436		kfree(new);
 437		if (IS_ERR(opt)) {
 438			retv = PTR_ERR(opt);
 439			break;
 440		}
 441
 442		/* routing header option needs extra check */
 443		retv = -EINVAL;
 444		if (optname == IPV6_RTHDR && opt && opt->srcrt) {
 445			struct ipv6_rt_hdr *rthdr = opt->srcrt;
 446			switch (rthdr->type) {
 447#if IS_ENABLED(CONFIG_IPV6_MIP6)
 448			case IPV6_SRCRT_TYPE_2:
 449				if (rthdr->hdrlen != 2 ||
 450				    rthdr->segments_left != 1)
 451					goto sticky_done;
 452
 453				break;
 454#endif
 455			case IPV6_SRCRT_TYPE_4:
 456			{
 457				struct ipv6_sr_hdr *srh = (struct ipv6_sr_hdr *)
 458							  opt->srcrt;
 459
 460				if (!seg6_validate_srh(srh, optlen))
 461					goto sticky_done;
 462				break;
 463			}
 464			default:
 465				goto sticky_done;
 466			}
 467		}
 468
 469		retv = 0;
 470		opt = ipv6_update_options(sk, opt);
 471sticky_done:
 472		if (opt) {
 473			atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
 474			txopt_put(opt);
 475		}
 476		break;
 477	}
 478
 479	case IPV6_PKTINFO:
 480	{
 481		struct in6_pktinfo pkt;
 482
 483		if (optlen == 0)
 484			goto e_inval;
 485		else if (optlen < sizeof(struct in6_pktinfo) || !optval)
 486			goto e_inval;
 487
 488		if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
 489				retv = -EFAULT;
 490				break;
 491		}
 492		if (!sk_dev_equal_l3scope(sk, pkt.ipi6_ifindex))
 493			goto e_inval;
 494
 495		np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
 496		np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
 497		retv = 0;
 498		break;
 499	}
 500
 501	case IPV6_2292PKTOPTIONS:
 502	{
 503		struct ipv6_txoptions *opt = NULL;
 504		struct msghdr msg;
 505		struct flowi6 fl6;
 506		struct ipcm6_cookie ipc6;
 507
 508		memset(&fl6, 0, sizeof(fl6));
 509		fl6.flowi6_oif = sk->sk_bound_dev_if;
 510		fl6.flowi6_mark = sk->sk_mark;
 511
 512		if (optlen == 0)
 513			goto update;
 514
 515		/* 1K is probably excessive
 516		 * 1K is surely not enough, 2K per standard header is 16K.
 517		 */
 518		retv = -EINVAL;
 519		if (optlen > 64*1024)
 520			break;
 521
 522		opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
 523		retv = -ENOBUFS;
 524		if (!opt)
 525			break;
 526
 527		memset(opt, 0, sizeof(*opt));
 528		refcount_set(&opt->refcnt, 1);
 529		opt->tot_len = sizeof(*opt) + optlen;
 530		retv = -EFAULT;
 531		if (copy_from_user(opt+1, optval, optlen))
 532			goto done;
 533
 534		msg.msg_controllen = optlen;
 535		msg.msg_control = (void *)(opt+1);
 536		ipc6.opt = opt;
 537
 538		retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6);
 539		if (retv)
 540			goto done;
 541update:
 542		retv = 0;
 543		opt = ipv6_update_options(sk, opt);
 544done:
 545		if (opt) {
 546			atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
 547			txopt_put(opt);
 548		}
 549		break;
 550	}
 551	case IPV6_UNICAST_HOPS:
 552		if (optlen < sizeof(int))
 553			goto e_inval;
 554		if (val > 255 || val < -1)
 555			goto e_inval;
 556		np->hop_limit = val;
 557		retv = 0;
 558		break;
 559
 560	case IPV6_MULTICAST_HOPS:
 561		if (sk->sk_type == SOCK_STREAM)
 562			break;
 563		if (optlen < sizeof(int))
 564			goto e_inval;
 565		if (val > 255 || val < -1)
 566			goto e_inval;
 567		np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
 568		retv = 0;
 569		break;
 570
 571	case IPV6_MULTICAST_LOOP:
 572		if (optlen < sizeof(int))
 573			goto e_inval;
 574		if (val != valbool)
 575			goto e_inval;
 576		np->mc_loop = valbool;
 577		retv = 0;
 578		break;
 579
 580	case IPV6_UNICAST_IF:
 581	{
 582		struct net_device *dev = NULL;
 583		int ifindex;
 584
 585		if (optlen != sizeof(int))
 586			goto e_inval;
 587
 588		ifindex = (__force int)ntohl((__force __be32)val);
 589		if (ifindex == 0) {
 590			np->ucast_oif = 0;
 591			retv = 0;
 592			break;
 593		}
 594
 595		dev = dev_get_by_index(net, ifindex);
 596		retv = -EADDRNOTAVAIL;
 597		if (!dev)
 598			break;
 599		dev_put(dev);
 600
 601		retv = -EINVAL;
 602		if (sk->sk_bound_dev_if)
 603			break;
 604
 605		np->ucast_oif = ifindex;
 606		retv = 0;
 607		break;
 608	}
 609
 610	case IPV6_MULTICAST_IF:
 611		if (sk->sk_type == SOCK_STREAM)
 612			break;
 613		if (optlen < sizeof(int))
 614			goto e_inval;
 615
 616		if (val) {
 617			struct net_device *dev;
 618			int midx;
 619
 620			rcu_read_lock();
 621
 622			dev = dev_get_by_index_rcu(net, val);
 623			if (!dev) {
 624				rcu_read_unlock();
 625				retv = -ENODEV;
 626				break;
 627			}
 628			midx = l3mdev_master_ifindex_rcu(dev);
 629
 630			rcu_read_unlock();
 631
 632			if (sk->sk_bound_dev_if &&
 633			    sk->sk_bound_dev_if != val &&
 634			    (!midx || midx != sk->sk_bound_dev_if))
 635				goto e_inval;
 636		}
 637		np->mcast_oif = val;
 638		retv = 0;
 639		break;
 640	case IPV6_ADD_MEMBERSHIP:
 641	case IPV6_DROP_MEMBERSHIP:
 642	{
 643		struct ipv6_mreq mreq;
 644
 645		if (optlen < sizeof(struct ipv6_mreq))
 646			goto e_inval;
 647
 648		retv = -EPROTO;
 649		if (inet_sk(sk)->is_icsk)
 650			break;
 651
 652		retv = -EFAULT;
 653		if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 654			break;
 655
 656		if (optname == IPV6_ADD_MEMBERSHIP)
 657			retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 658		else
 659			retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 660		break;
 661	}
 662	case IPV6_JOIN_ANYCAST:
 663	case IPV6_LEAVE_ANYCAST:
 664	{
 665		struct ipv6_mreq mreq;
 666
 667		if (optlen < sizeof(struct ipv6_mreq))
 668			goto e_inval;
 669
 670		retv = -EFAULT;
 671		if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 672			break;
 673
 674		if (optname == IPV6_JOIN_ANYCAST)
 675			retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 676		else
 677			retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 678		break;
 679	}
 680	case IPV6_MULTICAST_ALL:
 681		if (optlen < sizeof(int))
 682			goto e_inval;
 683		np->mc_all = valbool;
 684		retv = 0;
 685		break;
 686
 687	case MCAST_JOIN_GROUP:
 688	case MCAST_LEAVE_GROUP:
 689	{
 690		struct group_req greq;
 691		struct sockaddr_in6 *psin6;
 692
 693		if (optlen < sizeof(struct group_req))
 694			goto e_inval;
 695
 696		retv = -EFAULT;
 697		if (copy_from_user(&greq, optval, sizeof(struct group_req)))
 698			break;
 699		if (greq.gr_group.ss_family != AF_INET6) {
 700			retv = -EADDRNOTAVAIL;
 701			break;
 702		}
 703		psin6 = (struct sockaddr_in6 *)&greq.gr_group;
 704		if (optname == MCAST_JOIN_GROUP)
 705			retv = ipv6_sock_mc_join(sk, greq.gr_interface,
 706						 &psin6->sin6_addr);
 707		else
 708			retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
 709						 &psin6->sin6_addr);
 710		break;
 711	}
 712	case MCAST_JOIN_SOURCE_GROUP:
 713	case MCAST_LEAVE_SOURCE_GROUP:
 714	case MCAST_BLOCK_SOURCE:
 715	case MCAST_UNBLOCK_SOURCE:
 716	{
 717		struct group_source_req greqs;
 718		int omode, add;
 719
 720		if (optlen < sizeof(struct group_source_req))
 721			goto e_inval;
 722		if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 723			retv = -EFAULT;
 724			break;
 725		}
 726		if (greqs.gsr_group.ss_family != AF_INET6 ||
 727		    greqs.gsr_source.ss_family != AF_INET6) {
 728			retv = -EADDRNOTAVAIL;
 729			break;
 730		}
 731		if (optname == MCAST_BLOCK_SOURCE) {
 732			omode = MCAST_EXCLUDE;
 733			add = 1;
 734		} else if (optname == MCAST_UNBLOCK_SOURCE) {
 735			omode = MCAST_EXCLUDE;
 736			add = 0;
 737		} else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 738			struct sockaddr_in6 *psin6;
 739
 740			psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
 741			retv = ipv6_sock_mc_join_ssm(sk, greqs.gsr_interface,
 742						     &psin6->sin6_addr,
 743						     MCAST_INCLUDE);
 744			/* prior join w/ different source is ok */
 745			if (retv && retv != -EADDRINUSE)
 746				break;
 747			omode = MCAST_INCLUDE;
 748			add = 1;
 749		} else /* MCAST_LEAVE_SOURCE_GROUP */ {
 750			omode = MCAST_INCLUDE;
 751			add = 0;
 752		}
 753		retv = ip6_mc_source(add, omode, sk, &greqs);
 754		break;
 755	}
 756	case MCAST_MSFILTER:
 757	{
 758		struct group_filter *gsf;
 759
 760		if (optlen < GROUP_FILTER_SIZE(0))
 761			goto e_inval;
 762		if (optlen > sysctl_optmem_max) {
 763			retv = -ENOBUFS;
 764			break;
 765		}
 766		gsf = memdup_user(optval, optlen);
 767		if (IS_ERR(gsf)) {
 768			retv = PTR_ERR(gsf);
 769			break;
 770		}
 771		/* numsrc >= (4G-140)/128 overflow in 32 bits */
 772		if (gsf->gf_numsrc >= 0x1ffffffU ||
 773		    gsf->gf_numsrc > sysctl_mld_max_msf) {
 774			kfree(gsf);
 775			retv = -ENOBUFS;
 776			break;
 777		}
 778		if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 779			kfree(gsf);
 780			retv = -EINVAL;
 781			break;
 782		}
 783		retv = ip6_mc_msfilter(sk, gsf);
 784		kfree(gsf);
 785
 786		break;
 787	}
 788	case IPV6_ROUTER_ALERT:
 789		if (optlen < sizeof(int))
 790			goto e_inval;
 791		retv = ip6_ra_control(sk, val);
 792		break;
 793	case IPV6_ROUTER_ALERT_ISOLATE:
 794		if (optlen < sizeof(int))
 795			goto e_inval;
 796		np->rtalert_isolate = valbool;
 797		retv = 0;
 798		break;
 799	case IPV6_MTU_DISCOVER:
 800		if (optlen < sizeof(int))
 801			goto e_inval;
 802		if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
 803			goto e_inval;
 804		np->pmtudisc = val;
 805		retv = 0;
 806		break;
 807	case IPV6_MTU:
 808		if (optlen < sizeof(int))
 809			goto e_inval;
 810		if (val && val < IPV6_MIN_MTU)
 811			goto e_inval;
 812		np->frag_size = val;
 813		retv = 0;
 814		break;
 815	case IPV6_RECVERR:
 816		if (optlen < sizeof(int))
 817			goto e_inval;
 818		np->recverr = valbool;
 819		if (!val)
 820			skb_queue_purge(&sk->sk_error_queue);
 821		retv = 0;
 822		break;
 823	case IPV6_FLOWINFO_SEND:
 824		if (optlen < sizeof(int))
 825			goto e_inval;
 826		np->sndflow = valbool;
 827		retv = 0;
 828		break;
 829	case IPV6_FLOWLABEL_MGR:
 830		retv = ipv6_flowlabel_opt(sk, optval, optlen);
 831		break;
 832	case IPV6_IPSEC_POLICY:
 833	case IPV6_XFRM_POLICY:
 834		retv = -EPERM;
 835		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 836			break;
 837		retv = xfrm_user_policy(sk, optname, optval, optlen);
 838		break;
 839
 840	case IPV6_ADDR_PREFERENCES:
 841	    {
 842		unsigned int pref = 0;
 843		unsigned int prefmask = ~0;
 844
 845		if (optlen < sizeof(int))
 846			goto e_inval;
 847
 848		retv = -EINVAL;
 849
 850		/* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
 851		switch (val & (IPV6_PREFER_SRC_PUBLIC|
 852			       IPV6_PREFER_SRC_TMP|
 853			       IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
 854		case IPV6_PREFER_SRC_PUBLIC:
 855			pref |= IPV6_PREFER_SRC_PUBLIC;
 856			break;
 857		case IPV6_PREFER_SRC_TMP:
 858			pref |= IPV6_PREFER_SRC_TMP;
 859			break;
 860		case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
 861			break;
 862		case 0:
 863			goto pref_skip_pubtmp;
 864		default:
 865			goto e_inval;
 866		}
 867
 868		prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
 869			      IPV6_PREFER_SRC_TMP);
 870pref_skip_pubtmp:
 871
 872		/* check HOME/COA conflicts */
 873		switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
 874		case IPV6_PREFER_SRC_HOME:
 875			break;
 876		case IPV6_PREFER_SRC_COA:
 877			pref |= IPV6_PREFER_SRC_COA;
 878		case 0:
 879			goto pref_skip_coa;
 880		default:
 881			goto e_inval;
 882		}
 883
 884		prefmask &= ~IPV6_PREFER_SRC_COA;
 885pref_skip_coa:
 886
 887		/* check CGA/NONCGA conflicts */
 888		switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
 889		case IPV6_PREFER_SRC_CGA:
 890		case IPV6_PREFER_SRC_NONCGA:
 891		case 0:
 892			break;
 893		default:
 894			goto e_inval;
 895		}
 896
 897		np->srcprefs = (np->srcprefs & prefmask) | pref;
 898		retv = 0;
 899
 900		break;
 901	    }
 902	case IPV6_MINHOPCOUNT:
 903		if (optlen < sizeof(int))
 904			goto e_inval;
 905		if (val < 0 || val > 255)
 906			goto e_inval;
 907		np->min_hopcount = val;
 908		retv = 0;
 909		break;
 910	case IPV6_DONTFRAG:
 911		np->dontfrag = valbool;
 912		retv = 0;
 913		break;
 914	case IPV6_AUTOFLOWLABEL:
 915		np->autoflowlabel = valbool;
 916		np->autoflowlabel_set = 1;
 917		retv = 0;
 918		break;
 919	case IPV6_RECVFRAGSIZE:
 920		np->rxopt.bits.recvfragsize = valbool;
 921		retv = 0;
 922		break;
 923	}
 924
 925	release_sock(sk);
 926	if (needs_rtnl)
 927		rtnl_unlock();
 928
 929	return retv;
 930
 931e_inval:
 932	release_sock(sk);
 933	if (needs_rtnl)
 934		rtnl_unlock();
 935	return -EINVAL;
 936}
 937
 938int ipv6_setsockopt(struct sock *sk, int level, int optname,
 939		    char __user *optval, unsigned int optlen)
 940{
 941	int err;
 942
 943	if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 944		return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 945
 946	if (level != SOL_IPV6)
 947		return -ENOPROTOOPT;
 948
 949	err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 950#ifdef CONFIG_NETFILTER
 951	/* we need to exclude all possible ENOPROTOOPTs except default case */
 952	if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 953			optname != IPV6_XFRM_POLICY)
 954		err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen);
 955#endif
 956	return err;
 957}
 958EXPORT_SYMBOL(ipv6_setsockopt);
 959
 960#ifdef CONFIG_COMPAT
 961int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
 962			   char __user *optval, unsigned int optlen)
 963{
 964	int err;
 965
 966	if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
 967		if (udp_prot.compat_setsockopt != NULL)
 968			return udp_prot.compat_setsockopt(sk, level, optname,
 969							  optval, optlen);
 970		return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 971	}
 972
 973	if (level != SOL_IPV6)
 974		return -ENOPROTOOPT;
 975
 976	if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
 977		return compat_mc_setsockopt(sk, level, optname, optval, optlen,
 978			ipv6_setsockopt);
 979
 980	err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 981#ifdef CONFIG_NETFILTER
 982	/* we need to exclude all possible ENOPROTOOPTs except default case */
 983	if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 984	    optname != IPV6_XFRM_POLICY)
 985		err = compat_nf_setsockopt(sk, PF_INET6, optname, optval,
 986					   optlen);
 987#endif
 988	return err;
 989}
 990EXPORT_SYMBOL(compat_ipv6_setsockopt);
 991#endif
 992
 993static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
 994				  int optname, char __user *optval, int len)
 995{
 996	struct ipv6_opt_hdr *hdr;
 997
 998	if (!opt)
 999		return 0;
1000
1001	switch (optname) {
1002	case IPV6_HOPOPTS:
1003		hdr = opt->hopopt;
1004		break;
1005	case IPV6_RTHDRDSTOPTS:
1006		hdr = opt->dst0opt;
1007		break;
1008	case IPV6_RTHDR:
1009		hdr = (struct ipv6_opt_hdr *)opt->srcrt;
1010		break;
1011	case IPV6_DSTOPTS:
1012		hdr = opt->dst1opt;
1013		break;
1014	default:
1015		return -EINVAL;	/* should not happen */
1016	}
1017
1018	if (!hdr)
1019		return 0;
1020
1021	len = min_t(unsigned int, len, ipv6_optlen(hdr));
1022	if (copy_to_user(optval, hdr, len))
1023		return -EFAULT;
1024	return len;
1025}
1026
1027static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
1028		    char __user *optval, int __user *optlen, unsigned int flags)
1029{
1030	struct ipv6_pinfo *np = inet6_sk(sk);
1031	int len;
1032	int val;
1033
1034	if (ip6_mroute_opt(optname))
1035		return ip6_mroute_getsockopt(sk, optname, optval, optlen);
1036
1037	if (get_user(len, optlen))
1038		return -EFAULT;
1039	switch (optname) {
1040	case IPV6_ADDRFORM:
1041		if (sk->sk_protocol != IPPROTO_UDP &&
1042		    sk->sk_protocol != IPPROTO_UDPLITE &&
1043		    sk->sk_protocol != IPPROTO_TCP)
1044			return -ENOPROTOOPT;
1045		if (sk->sk_state != TCP_ESTABLISHED)
1046			return -ENOTCONN;
1047		val = sk->sk_family;
1048		break;
1049	case MCAST_MSFILTER:
1050	{
1051		struct group_filter gsf;
1052		int err;
1053
1054		if (len < GROUP_FILTER_SIZE(0))
1055			return -EINVAL;
1056		if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
1057			return -EFAULT;
1058		if (gsf.gf_group.ss_family != AF_INET6)
1059			return -EADDRNOTAVAIL;
1060		lock_sock(sk);
1061		err = ip6_mc_msfget(sk, &gsf,
1062			(struct group_filter __user *)optval, optlen);
1063		release_sock(sk);
1064		return err;
1065	}
1066
1067	case IPV6_2292PKTOPTIONS:
1068	{
1069		struct msghdr msg;
1070		struct sk_buff *skb;
1071
1072		if (sk->sk_type != SOCK_STREAM)
1073			return -ENOPROTOOPT;
1074
1075		msg.msg_control = optval;
1076		msg.msg_controllen = len;
1077		msg.msg_flags = flags;
1078
1079		lock_sock(sk);
1080		skb = np->pktoptions;
1081		if (skb)
1082			ip6_datagram_recv_ctl(sk, &msg, skb);
1083		release_sock(sk);
1084		if (!skb) {
1085			if (np->rxopt.bits.rxinfo) {
1086				struct in6_pktinfo src_info;
1087				src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1088					np->sticky_pktinfo.ipi6_ifindex;
1089				src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr;
1090				put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
1091			}
1092			if (np->rxopt.bits.rxhlim) {
1093				int hlim = np->mcast_hops;
1094				put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
1095			}
1096			if (np->rxopt.bits.rxtclass) {
1097				int tclass = (int)ip6_tclass(np->rcv_flowinfo);
1098
1099				put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
1100			}
1101			if (np->rxopt.bits.rxoinfo) {
1102				struct in6_pktinfo src_info;
1103				src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1104					np->sticky_pktinfo.ipi6_ifindex;
1105				src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr :
1106								     np->sticky_pktinfo.ipi6_addr;
1107				put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
1108			}
1109			if (np->rxopt.bits.rxohlim) {
1110				int hlim = np->mcast_hops;
1111				put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1112			}
1113			if (np->rxopt.bits.rxflow) {
1114				__be32 flowinfo = np->rcv_flowinfo;
1115
1116				put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
1117			}
1118		}
1119		len -= msg.msg_controllen;
1120		return put_user(len, optlen);
1121	}
1122	case IPV6_MTU:
1123	{
1124		struct dst_entry *dst;
1125
1126		val = 0;
1127		rcu_read_lock();
1128		dst = __sk_dst_get(sk);
1129		if (dst)
1130			val = dst_mtu(dst);
1131		rcu_read_unlock();
1132		if (!val)
1133			return -ENOTCONN;
1134		break;
1135	}
1136
1137	case IPV6_V6ONLY:
1138		val = sk->sk_ipv6only;
1139		break;
1140
1141	case IPV6_RECVPKTINFO:
1142		val = np->rxopt.bits.rxinfo;
1143		break;
1144
1145	case IPV6_2292PKTINFO:
1146		val = np->rxopt.bits.rxoinfo;
1147		break;
1148
1149	case IPV6_RECVHOPLIMIT:
1150		val = np->rxopt.bits.rxhlim;
1151		break;
1152
1153	case IPV6_2292HOPLIMIT:
1154		val = np->rxopt.bits.rxohlim;
1155		break;
1156
1157	case IPV6_RECVRTHDR:
1158		val = np->rxopt.bits.srcrt;
1159		break;
1160
1161	case IPV6_2292RTHDR:
1162		val = np->rxopt.bits.osrcrt;
1163		break;
1164
1165	case IPV6_HOPOPTS:
1166	case IPV6_RTHDRDSTOPTS:
1167	case IPV6_RTHDR:
1168	case IPV6_DSTOPTS:
1169	{
1170		struct ipv6_txoptions *opt;
1171
1172		lock_sock(sk);
1173		opt = rcu_dereference_protected(np->opt,
1174						lockdep_sock_is_held(sk));
1175		len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len);
1176		release_sock(sk);
1177		/* check if ipv6_getsockopt_sticky() returns err code */
1178		if (len < 0)
1179			return len;
1180		return put_user(len, optlen);
1181	}
1182
1183	case IPV6_RECVHOPOPTS:
1184		val = np->rxopt.bits.hopopts;
1185		break;
1186
1187	case IPV6_2292HOPOPTS:
1188		val = np->rxopt.bits.ohopopts;
1189		break;
1190
1191	case IPV6_RECVDSTOPTS:
1192		val = np->rxopt.bits.dstopts;
1193		break;
1194
1195	case IPV6_2292DSTOPTS:
1196		val = np->rxopt.bits.odstopts;
1197		break;
1198
1199	case IPV6_TCLASS:
1200		val = np->tclass;
1201		break;
1202
1203	case IPV6_RECVTCLASS:
1204		val = np->rxopt.bits.rxtclass;
1205		break;
1206
1207	case IPV6_FLOWINFO:
1208		val = np->rxopt.bits.rxflow;
1209		break;
1210
1211	case IPV6_RECVPATHMTU:
1212		val = np->rxopt.bits.rxpmtu;
1213		break;
1214
1215	case IPV6_PATHMTU:
1216	{
1217		struct dst_entry *dst;
1218		struct ip6_mtuinfo mtuinfo;
1219
1220		if (len < sizeof(mtuinfo))
1221			return -EINVAL;
1222
1223		len = sizeof(mtuinfo);
1224		memset(&mtuinfo, 0, sizeof(mtuinfo));
1225
1226		rcu_read_lock();
1227		dst = __sk_dst_get(sk);
1228		if (dst)
1229			mtuinfo.ip6m_mtu = dst_mtu(dst);
1230		rcu_read_unlock();
1231		if (!mtuinfo.ip6m_mtu)
1232			return -ENOTCONN;
1233
1234		if (put_user(len, optlen))
1235			return -EFAULT;
1236		if (copy_to_user(optval, &mtuinfo, len))
1237			return -EFAULT;
1238
1239		return 0;
1240	}
1241
1242	case IPV6_TRANSPARENT:
1243		val = inet_sk(sk)->transparent;
1244		break;
1245
1246	case IPV6_FREEBIND:
1247		val = inet_sk(sk)->freebind;
1248		break;
1249
1250	case IPV6_RECVORIGDSTADDR:
1251		val = np->rxopt.bits.rxorigdstaddr;
1252		break;
1253
1254	case IPV6_UNICAST_HOPS:
1255	case IPV6_MULTICAST_HOPS:
1256	{
1257		struct dst_entry *dst;
1258
1259		if (optname == IPV6_UNICAST_HOPS)
1260			val = np->hop_limit;
1261		else
1262			val = np->mcast_hops;
1263
1264		if (val < 0) {
1265			rcu_read_lock();
1266			dst = __sk_dst_get(sk);
1267			if (dst)
1268				val = ip6_dst_hoplimit(dst);
1269			rcu_read_unlock();
1270		}
1271
1272		if (val < 0)
1273			val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1274		break;
1275	}
1276
1277	case IPV6_MULTICAST_LOOP:
1278		val = np->mc_loop;
1279		break;
1280
1281	case IPV6_MULTICAST_IF:
1282		val = np->mcast_oif;
1283		break;
1284
1285	case IPV6_MULTICAST_ALL:
1286		val = np->mc_all;
1287		break;
1288
1289	case IPV6_UNICAST_IF:
1290		val = (__force int)htonl((__u32) np->ucast_oif);
1291		break;
1292
1293	case IPV6_MTU_DISCOVER:
1294		val = np->pmtudisc;
1295		break;
1296
1297	case IPV6_RECVERR:
1298		val = np->recverr;
1299		break;
1300
1301	case IPV6_FLOWINFO_SEND:
1302		val = np->sndflow;
1303		break;
1304
1305	case IPV6_FLOWLABEL_MGR:
1306	{
1307		struct in6_flowlabel_req freq;
1308		int flags;
1309
1310		if (len < sizeof(freq))
1311			return -EINVAL;
1312
1313		if (copy_from_user(&freq, optval, sizeof(freq)))
1314			return -EFAULT;
1315
1316		if (freq.flr_action != IPV6_FL_A_GET)
1317			return -EINVAL;
1318
1319		len = sizeof(freq);
1320		flags = freq.flr_flags;
1321
1322		memset(&freq, 0, sizeof(freq));
1323
1324		val = ipv6_flowlabel_opt_get(sk, &freq, flags);
1325		if (val < 0)
1326			return val;
1327
1328		if (put_user(len, optlen))
1329			return -EFAULT;
1330		if (copy_to_user(optval, &freq, len))
1331			return -EFAULT;
1332
1333		return 0;
1334	}
1335
1336	case IPV6_ADDR_PREFERENCES:
1337		val = 0;
1338
1339		if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1340			val |= IPV6_PREFER_SRC_TMP;
1341		else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1342			val |= IPV6_PREFER_SRC_PUBLIC;
1343		else {
1344			/* XXX: should we return system default? */
1345			val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1346		}
1347
1348		if (np->srcprefs & IPV6_PREFER_SRC_COA)
1349			val |= IPV6_PREFER_SRC_COA;
1350		else
1351			val |= IPV6_PREFER_SRC_HOME;
1352		break;
1353
1354	case IPV6_MINHOPCOUNT:
1355		val = np->min_hopcount;
1356		break;
1357
1358	case IPV6_DONTFRAG:
1359		val = np->dontfrag;
1360		break;
1361
1362	case IPV6_AUTOFLOWLABEL:
1363		val = ip6_autoflowlabel(sock_net(sk), np);
1364		break;
1365
1366	case IPV6_RECVFRAGSIZE:
1367		val = np->rxopt.bits.recvfragsize;
1368		break;
1369
1370	case IPV6_ROUTER_ALERT_ISOLATE:
1371		val = np->rtalert_isolate;
1372		break;
1373
1374	default:
1375		return -ENOPROTOOPT;
1376	}
1377	len = min_t(unsigned int, sizeof(int), len);
1378	if (put_user(len, optlen))
1379		return -EFAULT;
1380	if (copy_to_user(optval, &val, len))
1381		return -EFAULT;
1382	return 0;
1383}
1384
1385int ipv6_getsockopt(struct sock *sk, int level, int optname,
1386		    char __user *optval, int __user *optlen)
1387{
1388	int err;
1389
1390	if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1391		return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1392
1393	if (level != SOL_IPV6)
1394		return -ENOPROTOOPT;
1395
1396	err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0);
1397#ifdef CONFIG_NETFILTER
1398	/* we need to exclude all possible ENOPROTOOPTs except default case */
1399	if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1400		int len;
1401
1402		if (get_user(len, optlen))
1403			return -EFAULT;
1404
1405		err = nf_getsockopt(sk, PF_INET6, optname, optval, &len);
1406		if (err >= 0)
1407			err = put_user(len, optlen);
1408	}
1409#endif
1410	return err;
1411}
1412EXPORT_SYMBOL(ipv6_getsockopt);
1413
1414#ifdef CONFIG_COMPAT
1415int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1416			   char __user *optval, int __user *optlen)
1417{
1418	int err;
1419
1420	if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1421		if (udp_prot.compat_getsockopt != NULL)
1422			return udp_prot.compat_getsockopt(sk, level, optname,
1423							  optval, optlen);
1424		return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1425	}
1426
1427	if (level != SOL_IPV6)
1428		return -ENOPROTOOPT;
1429
1430	if (optname == MCAST_MSFILTER)
1431		return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1432			ipv6_getsockopt);
1433
1434	err = do_ipv6_getsockopt(sk, level, optname, optval, optlen,
1435				 MSG_CMSG_COMPAT);
1436#ifdef CONFIG_NETFILTER
1437	/* we need to exclude all possible ENOPROTOOPTs except default case */
1438	if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1439		int len;
1440
1441		if (get_user(len, optlen))
1442			return -EFAULT;
1443
1444		err = compat_nf_getsockopt(sk, PF_INET6, optname, optval, &len);
1445		if (err >= 0)
1446			err = put_user(len, optlen);
1447	}
1448#endif
1449	return err;
1450}
1451EXPORT_SYMBOL(compat_ipv6_getsockopt);
1452#endif