ipv6_sockglue.c 29.5 KB
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/*
 *	IPv6 BSD socket options interface
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 *	Linux INET6 implementation
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 *
 *	Authors:
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 *	Pedro Roque		<roque@di.fc.ul.pt>
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 *
 *	Based on linux/net/ipv4/ip_sockglue.c
 *
 *	This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      as published by the Free Software Foundation; either version
 *      2 of the License, or (at your option) any later version.
 *
 *	FIXME: Make the setsockopt code POSIX compliant: That is
 *
 *	o	Truncate getsockopt returns
 *	o	Return an optlen of the truncated length if need be
 *
 *	Changes:
 *	David L Stevens <dlstevens@us.ibm.com>:
 *		- added multicast source filtering API for MLDv2
 */

#include <linux/module.h>
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#include <linux/capability.h>
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#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <linux/in6.h>
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#include <linux/mroute6.h>
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#include <linux/netdevice.h>
#include <linux/if_arp.h>
#include <linux/init.h>
#include <linux/sysctl.h>
#include <linux/netfilter.h>
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#include <linux/slab.h>
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#include <net/sock.h>
#include <net/snmp.h>
#include <net/ipv6.h>
#include <net/ndisc.h>
#include <net/protocol.h>
#include <net/transp_v6.h>
#include <net/ip6_route.h>
#include <net/addrconf.h>
#include <net/inet_common.h>
#include <net/tcp.h>
#include <net/udp.h>
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#include <net/udplite.h>
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#include <net/xfrm.h>
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#include <net/compat.h>
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#include <asm/uaccess.h>

struct ip6_ra_chain *ip6_ra_chain;
DEFINE_RWLOCK(ip6_ra_lock);

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int ip6_ra_control(struct sock *sk, int sel)
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{
	struct ip6_ra_chain *ra, *new_ra, **rap;

	/* RA packet may be delivered ONLY to IPPROTO_RAW socket */
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	if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num != IPPROTO_RAW)
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		return -ENOPROTOOPT;
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	new_ra = (sel >= 0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
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	write_lock_bh(&ip6_ra_lock);
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	for (rap = &ip6_ra_chain; (ra = *rap) != NULL; rap = &ra->next) {
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		if (ra->sk == sk) {
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			if (sel >= 0) {
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				write_unlock_bh(&ip6_ra_lock);
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				kfree(new_ra);
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				return -EADDRINUSE;
			}

			*rap = ra->next;
			write_unlock_bh(&ip6_ra_lock);

			sock_put(sk);
			kfree(ra);
			return 0;
		}
	}
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	if (!new_ra) {
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		write_unlock_bh(&ip6_ra_lock);
		return -ENOBUFS;
	}
	new_ra->sk = sk;
	new_ra->sel = sel;
	new_ra->next = ra;
	*rap = new_ra;
	sock_hold(sk);
	write_unlock_bh(&ip6_ra_lock);
	return 0;
}

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static
struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
					   struct ipv6_txoptions *opt)
{
	if (inet_sk(sk)->is_icsk) {
		if (opt &&
		    !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
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		    inet_sk(sk)->inet_daddr != LOOPBACK4_IPV6) {
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			struct inet_connection_sock *icsk = inet_csk(sk);
			icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
			icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
		}
	}
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	opt = xchg((__force struct ipv6_txoptions **)&inet6_sk(sk)->opt,
		   opt);
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	sk_dst_reset(sk);

	return opt;
}

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static bool setsockopt_needs_rtnl(int optname)
{
	switch (optname) {
	case IPV6_ADD_MEMBERSHIP:
	case IPV6_DROP_MEMBERSHIP:
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	case IPV6_JOIN_ANYCAST:
	case IPV6_LEAVE_ANYCAST:
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	case MCAST_JOIN_GROUP:
	case MCAST_LEAVE_GROUP:
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	case MCAST_JOIN_SOURCE_GROUP:
	case MCAST_LEAVE_SOURCE_GROUP:
	case MCAST_BLOCK_SOURCE:
	case MCAST_UNBLOCK_SOURCE:
	case MCAST_MSFILTER:
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		return true;
	}
	return false;
}

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static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
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		    char __user *optval, unsigned int optlen)
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{
	struct ipv6_pinfo *np = inet6_sk(sk);
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	struct net *net = sock_net(sk);
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	int val, valbool;
	int retv = -ENOPROTOOPT;
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	bool needs_rtnl = setsockopt_needs_rtnl(optname);
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	if (!optval)
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		val = 0;
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	else {
		if (optlen >= sizeof(int)) {
			if (get_user(val, (int __user *) optval))
				return -EFAULT;
		} else
			val = 0;
	}
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	valbool = (val != 0);
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	if (ip6_mroute_opt(optname))
		return ip6_mroute_setsockopt(sk, optname, optval, optlen);

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	if (needs_rtnl)
		rtnl_lock();
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	lock_sock(sk);

	switch (optname) {

	case IPV6_ADDRFORM:
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		if (optlen < sizeof(int))
			goto e_inval;
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		if (val == PF_INET) {
			struct ipv6_txoptions *opt;
			struct sk_buff *pktopt;

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			if (sk->sk_type == SOCK_RAW)
				break;

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			if (sk->sk_protocol == IPPROTO_UDP ||
			    sk->sk_protocol == IPPROTO_UDPLITE) {
				struct udp_sock *up = udp_sk(sk);
				if (up->pending == AF_INET6) {
					retv = -EBUSY;
					break;
				}
			} else if (sk->sk_protocol != IPPROTO_TCP)
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				break;

			if (sk->sk_state != TCP_ESTABLISHED) {
				retv = -ENOTCONN;
				break;
			}

			if (ipv6_only_sock(sk) ||
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			    !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) {
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				retv = -EADDRNOTAVAIL;
				break;
			}

			fl6_free_socklist(sk);
			ipv6_sock_mc_close(sk);

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			/*
			 * Sock is moving from IPv6 to IPv4 (sk_prot), so
			 * remove it from the refcnt debug socks count in the
			 * original family...
			 */
			sk_refcnt_debug_dec(sk);

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			if (sk->sk_protocol == IPPROTO_TCP) {
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				struct inet_connection_sock *icsk = inet_csk(sk);
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				local_bh_disable();
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				sock_prot_inuse_add(net, sk->sk_prot, -1);
				sock_prot_inuse_add(net, &tcp_prot, 1);
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				local_bh_enable();
				sk->sk_prot = &tcp_prot;
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				icsk->icsk_af_ops = &ipv4_specific;
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				sk->sk_socket->ops = &inet_stream_ops;
				sk->sk_family = PF_INET;
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				tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
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			} else {
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				struct proto *prot = &udp_prot;

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				if (sk->sk_protocol == IPPROTO_UDPLITE)
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					prot = &udplite_prot;
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				local_bh_disable();
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				sock_prot_inuse_add(net, sk->sk_prot, -1);
				sock_prot_inuse_add(net, prot, 1);
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				local_bh_enable();
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				sk->sk_prot = prot;
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				sk->sk_socket->ops = &inet_dgram_ops;
				sk->sk_family = PF_INET;
			}
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			opt = xchg((__force struct ipv6_txoptions **)&np->opt,
				   NULL);
			if (opt) {
				atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
				txopt_put(opt);
			}
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			pktopt = xchg(&np->pktoptions, NULL);
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			kfree_skb(pktopt);
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			sk->sk_destruct = inet_sock_destruct;
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			/*
			 * ... and add it to the refcnt debug socks count
			 * in the new family. -acme
			 */
			sk_refcnt_debug_inc(sk);
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			module_put(THIS_MODULE);
			retv = 0;
			break;
		}
		goto e_inval;

	case IPV6_V6ONLY:
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		if (optlen < sizeof(int) ||
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		    inet_sk(sk)->inet_num)
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			goto e_inval;
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		sk->sk_ipv6only = valbool;
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		retv = 0;
		break;

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	case IPV6_RECVPKTINFO:
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		if (optlen < sizeof(int))
			goto e_inval;
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		np->rxopt.bits.rxinfo = valbool;
		retv = 0;
		break;
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	case IPV6_2292PKTINFO:
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		if (optlen < sizeof(int))
			goto e_inval;
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		np->rxopt.bits.rxoinfo = valbool;
		retv = 0;
		break;
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	case IPV6_RECVHOPLIMIT:
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		if (optlen < sizeof(int))
			goto e_inval;
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		np->rxopt.bits.rxhlim = valbool;
		retv = 0;
		break;

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	case IPV6_2292HOPLIMIT:
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		if (optlen < sizeof(int))
			goto e_inval;
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		np->rxopt.bits.rxohlim = valbool;
		retv = 0;
		break;

	case IPV6_RECVRTHDR:
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		if (optlen < sizeof(int))
			goto e_inval;
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		np->rxopt.bits.srcrt = valbool;
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		retv = 0;
		break;

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	case IPV6_2292RTHDR:
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		if (optlen < sizeof(int))
			goto e_inval;
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		np->rxopt.bits.osrcrt = valbool;
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		retv = 0;
		break;

	case IPV6_RECVHOPOPTS:
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		if (optlen < sizeof(int))
			goto e_inval;
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		np->rxopt.bits.hopopts = valbool;
		retv = 0;
		break;

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	case IPV6_2292HOPOPTS:
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		if (optlen < sizeof(int))
			goto e_inval;
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		np->rxopt.bits.ohopopts = valbool;
		retv = 0;
		break;

	case IPV6_RECVDSTOPTS:
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		if (optlen < sizeof(int))
			goto e_inval;
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		np->rxopt.bits.dstopts = valbool;
		retv = 0;
		break;

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	case IPV6_2292DSTOPTS:
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		if (optlen < sizeof(int))
			goto e_inval;
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		np->rxopt.bits.odstopts = valbool;
		retv = 0;
		break;

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	case IPV6_TCLASS:
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		if (optlen < sizeof(int))
			goto e_inval;
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		if (val < -1 || val > 0xff)
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			goto e_inval;
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		/* RFC 3542, 6.5: default traffic class of 0x0 */
		if (val == -1)
			val = 0;
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		np->tclass = val;
		retv = 0;
		break;
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	case IPV6_RECVTCLASS:
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		if (optlen < sizeof(int))
			goto e_inval;
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		np->rxopt.bits.rxtclass = valbool;
		retv = 0;
		break;

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	case IPV6_FLOWINFO:
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		if (optlen < sizeof(int))
			goto e_inval;
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		np->rxopt.bits.rxflow = valbool;
		retv = 0;
		break;

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	case IPV6_RECVPATHMTU:
		if (optlen < sizeof(int))
			goto e_inval;
		np->rxopt.bits.rxpmtu = valbool;
		retv = 0;
		break;

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	case IPV6_TRANSPARENT:
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		if (valbool && !ns_capable(net->user_ns, CAP_NET_ADMIN) &&
		    !ns_capable(net->user_ns, CAP_NET_RAW)) {
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			retv = -EPERM;
			break;
		}
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		if (optlen < sizeof(int))
			goto e_inval;
		/* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */
		inet_sk(sk)->transparent = valbool;
		retv = 0;
		break;

	case IPV6_RECVORIGDSTADDR:
		if (optlen < sizeof(int))
			goto e_inval;
		np->rxopt.bits.rxorigdstaddr = valbool;
		retv = 0;
		break;

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	case IPV6_HOPOPTS:
	case IPV6_RTHDRDSTOPTS:
	case IPV6_RTHDR:
	case IPV6_DSTOPTS:
	{
		struct ipv6_txoptions *opt;
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		/* remove any sticky options header with a zero option
		 * length, per RFC3542.
		 */
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		if (optlen == 0)
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			optval = NULL;
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		else if (!optval)
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			goto e_inval;
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		else if (optlen < sizeof(struct ipv6_opt_hdr) ||
			 optlen & 0x7 || optlen > 8 * 255)
			goto e_inval;
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		/* hop-by-hop / destination options are privileged option */
		retv = -EPERM;
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		if (optname != IPV6_RTHDR && !ns_capable(net->user_ns, CAP_NET_RAW))
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			break;

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		opt = rcu_dereference_protected(np->opt,
						lockdep_sock_is_held(sk));
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		opt = ipv6_renew_options(sk, opt, optname,
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					 (struct ipv6_opt_hdr __user *)optval,
					 optlen);
		if (IS_ERR(opt)) {
			retv = PTR_ERR(opt);
			break;
		}

		/* routing header option needs extra check */
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		retv = -EINVAL;
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		if (optname == IPV6_RTHDR && opt && opt->srcrt) {
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			struct ipv6_rt_hdr *rthdr = opt->srcrt;
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			switch (rthdr->type) {
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#if IS_ENABLED(CONFIG_IPV6_MIP6)
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			case IPV6_SRCRT_TYPE_2:
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				if (rthdr->hdrlen != 2 ||
				    rthdr->segments_left != 1)
					goto sticky_done;

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				break;
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#endif
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			default:
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				goto sticky_done;
435
			}
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		}

		retv = 0;
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		opt = ipv6_update_options(sk, opt);
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sticky_done:
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		if (opt) {
			atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
			txopt_put(opt);
		}
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		break;
	}

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	case IPV6_PKTINFO:
	{
		struct in6_pktinfo pkt;

		if (optlen == 0)
			goto e_inval;
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		else if (optlen < sizeof(struct in6_pktinfo) || !optval)
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			goto e_inval;

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		if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
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				retv = -EFAULT;
				break;
		}
		if (sk->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if)
			goto e_inval;

		np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
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		np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
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		retv = 0;
		break;
	}

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	case IPV6_2292PKTOPTIONS:
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	{
		struct ipv6_txoptions *opt = NULL;
		struct msghdr msg;
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		struct flowi6 fl6;
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		struct sockcm_cookie sockc_junk;
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		struct ipcm6_cookie ipc6;
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		memset(&fl6, 0, sizeof(fl6));
		fl6.flowi6_oif = sk->sk_bound_dev_if;
		fl6.flowi6_mark = sk->sk_mark;
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		if (optlen == 0)
			goto update;

		/* 1K is probably excessive
		 * 1K is surely not enough, 2K per standard header is 16K.
		 */
		retv = -EINVAL;
		if (optlen > 64*1024)
			break;

		opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
		retv = -ENOBUFS;
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		if (!opt)
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			break;

		memset(opt, 0, sizeof(*opt));
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		atomic_set(&opt->refcnt, 1);
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		opt->tot_len = sizeof(*opt) + optlen;
		retv = -EFAULT;
		if (copy_from_user(opt+1, optval, optlen))
			goto done;

		msg.msg_controllen = optlen;
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		msg.msg_control = (void *)(opt+1);
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		ipc6.opt = opt;
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		retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6, &sockc_junk);
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		if (retv)
			goto done;
update:
		retv = 0;
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		opt = ipv6_update_options(sk, opt);
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done:
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		if (opt) {
			atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
			txopt_put(opt);
		}
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		break;
	}
	case IPV6_UNICAST_HOPS:
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		if (optlen < sizeof(int))
			goto e_inval;
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		if (val > 255 || val < -1)
			goto e_inval;
		np->hop_limit = val;
		retv = 0;
		break;

	case IPV6_MULTICAST_HOPS:
		if (sk->sk_type == SOCK_STREAM)
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			break;
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		if (optlen < sizeof(int))
			goto e_inval;
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		if (val > 255 || val < -1)
			goto e_inval;
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		np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
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		retv = 0;
		break;

	case IPV6_MULTICAST_LOOP:
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		if (optlen < sizeof(int))
			goto e_inval;
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		if (val != valbool)
			goto e_inval;
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		np->mc_loop = valbool;
		retv = 0;
		break;

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	case IPV6_UNICAST_IF:
	{
		struct net_device *dev = NULL;
		int ifindex;

		if (optlen != sizeof(int))
			goto e_inval;

		ifindex = (__force int)ntohl((__force __be32)val);
		if (ifindex == 0) {
			np->ucast_oif = 0;
			retv = 0;
			break;
		}

		dev = dev_get_by_index(net, ifindex);
		retv = -EADDRNOTAVAIL;
		if (!dev)
			break;
		dev_put(dev);

		retv = -EINVAL;
		if (sk->sk_bound_dev_if)
			break;

		np->ucast_oif = ifindex;
		retv = 0;
		break;
	}

L
Linus Torvalds 已提交
580 581
	case IPV6_MULTICAST_IF:
		if (sk->sk_type == SOCK_STREAM)
582
			break;
583 584
		if (optlen < sizeof(int))
			goto e_inval;
L
Linus Torvalds 已提交
585

586
		if (val) {
E
Eric Dumazet 已提交
587 588
			struct net_device *dev;

589 590 591
			if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
				goto e_inval;

E
Eric Dumazet 已提交
592 593
			dev = dev_get_by_index(net, val);
			if (!dev) {
594 595 596
				retv = -ENODEV;
				break;
			}
E
Eric Dumazet 已提交
597
			dev_put(dev);
L
Linus Torvalds 已提交
598 599 600 601 602 603 604 605 606
		}
		np->mcast_oif = val;
		retv = 0;
		break;
	case IPV6_ADD_MEMBERSHIP:
	case IPV6_DROP_MEMBERSHIP:
	{
		struct ipv6_mreq mreq;

607 608 609
		if (optlen < sizeof(struct ipv6_mreq))
			goto e_inval;

610 611 612 613
		retv = -EPROTO;
		if (inet_sk(sk)->is_icsk)
			break;

L
Linus Torvalds 已提交
614 615 616 617 618
		retv = -EFAULT;
		if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
			break;

		if (optname == IPV6_ADD_MEMBERSHIP)
619
			retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
L
Linus Torvalds 已提交
620
		else
621
			retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
L
Linus Torvalds 已提交
622 623 624 625 626 627 628
		break;
	}
	case IPV6_JOIN_ANYCAST:
	case IPV6_LEAVE_ANYCAST:
	{
		struct ipv6_mreq mreq;

629
		if (optlen < sizeof(struct ipv6_mreq))
L
Linus Torvalds 已提交
630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647
			goto e_inval;

		retv = -EFAULT;
		if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
			break;

		if (optname == IPV6_JOIN_ANYCAST)
			retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
		else
			retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
		break;
	}
	case MCAST_JOIN_GROUP:
	case MCAST_LEAVE_GROUP:
	{
		struct group_req greq;
		struct sockaddr_in6 *psin6;

648 649 650
		if (optlen < sizeof(struct group_req))
			goto e_inval;

L
Linus Torvalds 已提交
651 652 653 654 655 656 657 658 659
		retv = -EFAULT;
		if (copy_from_user(&greq, optval, sizeof(struct group_req)))
			break;
		if (greq.gr_group.ss_family != AF_INET6) {
			retv = -EADDRNOTAVAIL;
			break;
		}
		psin6 = (struct sockaddr_in6 *)&greq.gr_group;
		if (optname == MCAST_JOIN_GROUP)
660 661
			retv = ipv6_sock_mc_join(sk, greq.gr_interface,
						 &psin6->sin6_addr);
L
Linus Torvalds 已提交
662
		else
663 664
			retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
						 &psin6->sin6_addr);
L
Linus Torvalds 已提交
665 666 667 668 669 670 671 672 673 674
		break;
	}
	case MCAST_JOIN_SOURCE_GROUP:
	case MCAST_LEAVE_SOURCE_GROUP:
	case MCAST_BLOCK_SOURCE:
	case MCAST_UNBLOCK_SOURCE:
	{
		struct group_source_req greqs;
		int omode, add;

675
		if (optlen < sizeof(struct group_source_req))
L
Linus Torvalds 已提交
676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695
			goto e_inval;
		if (copy_from_user(&greqs, optval, sizeof(greqs))) {
			retv = -EFAULT;
			break;
		}
		if (greqs.gsr_group.ss_family != AF_INET6 ||
		    greqs.gsr_source.ss_family != AF_INET6) {
			retv = -EADDRNOTAVAIL;
			break;
		}
		if (optname == MCAST_BLOCK_SOURCE) {
			omode = MCAST_EXCLUDE;
			add = 1;
		} else if (optname == MCAST_UNBLOCK_SOURCE) {
			omode = MCAST_EXCLUDE;
			add = 0;
		} else if (optname == MCAST_JOIN_SOURCE_GROUP) {
			struct sockaddr_in6 *psin6;

			psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
696 697
			retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
						 &psin6->sin6_addr);
698 699
			/* prior join w/ different source is ok */
			if (retv && retv != -EADDRINUSE)
L
Linus Torvalds 已提交
700 701 702
				break;
			omode = MCAST_INCLUDE;
			add = 1;
703
		} else /* MCAST_LEAVE_SOURCE_GROUP */ {
L
Linus Torvalds 已提交
704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719
			omode = MCAST_INCLUDE;
			add = 0;
		}
		retv = ip6_mc_source(add, omode, sk, &greqs);
		break;
	}
	case MCAST_MSFILTER:
	{
		struct group_filter *gsf;

		if (optlen < GROUP_FILTER_SIZE(0))
			goto e_inval;
		if (optlen > sysctl_optmem_max) {
			retv = -ENOBUFS;
			break;
		}
720
		gsf = kmalloc(optlen, GFP_KERNEL);
S
Stephen Hemminger 已提交
721
		if (!gsf) {
L
Linus Torvalds 已提交
722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747
			retv = -ENOBUFS;
			break;
		}
		retv = -EFAULT;
		if (copy_from_user(gsf, optval, optlen)) {
			kfree(gsf);
			break;
		}
		/* numsrc >= (4G-140)/128 overflow in 32 bits */
		if (gsf->gf_numsrc >= 0x1ffffffU ||
		    gsf->gf_numsrc > sysctl_mld_max_msf) {
			kfree(gsf);
			retv = -ENOBUFS;
			break;
		}
		if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
			kfree(gsf);
			retv = -EINVAL;
			break;
		}
		retv = ip6_mc_msfilter(sk, gsf);
		kfree(gsf);

		break;
	}
	case IPV6_ROUTER_ALERT:
748 749
		if (optlen < sizeof(int))
			goto e_inval;
750
		retv = ip6_ra_control(sk, val);
L
Linus Torvalds 已提交
751 752
		break;
	case IPV6_MTU_DISCOVER:
753 754
		if (optlen < sizeof(int))
			goto e_inval;
755
		if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
L
Linus Torvalds 已提交
756 757 758 759 760
			goto e_inval;
		np->pmtudisc = val;
		retv = 0;
		break;
	case IPV6_MTU:
761 762
		if (optlen < sizeof(int))
			goto e_inval;
L
Linus Torvalds 已提交
763 764 765 766 767 768
		if (val && val < IPV6_MIN_MTU)
			goto e_inval;
		np->frag_size = val;
		retv = 0;
		break;
	case IPV6_RECVERR:
769 770
		if (optlen < sizeof(int))
			goto e_inval;
L
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771 772 773 774 775 776
		np->recverr = valbool;
		if (!val)
			skb_queue_purge(&sk->sk_error_queue);
		retv = 0;
		break;
	case IPV6_FLOWINFO_SEND:
777 778
		if (optlen < sizeof(int))
			goto e_inval;
L
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779 780 781 782 783 784 785 786
		np->sndflow = valbool;
		retv = 0;
		break;
	case IPV6_FLOWLABEL_MGR:
		retv = ipv6_flowlabel_opt(sk, optval, optlen);
		break;
	case IPV6_IPSEC_POLICY:
	case IPV6_XFRM_POLICY:
787
		retv = -EPERM;
788
		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
789
			break;
L
Linus Torvalds 已提交
790 791 792
		retv = xfrm_user_policy(sk, optname, optval, optlen);
		break;

793 794 795 796 797
	case IPV6_ADDR_PREFERENCES:
	    {
		unsigned int pref = 0;
		unsigned int prefmask = ~0;

798 799 800
		if (optlen < sizeof(int))
			goto e_inval;

801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854
		retv = -EINVAL;

		/* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
		switch (val & (IPV6_PREFER_SRC_PUBLIC|
			       IPV6_PREFER_SRC_TMP|
			       IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
		case IPV6_PREFER_SRC_PUBLIC:
			pref |= IPV6_PREFER_SRC_PUBLIC;
			break;
		case IPV6_PREFER_SRC_TMP:
			pref |= IPV6_PREFER_SRC_TMP;
			break;
		case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
			break;
		case 0:
			goto pref_skip_pubtmp;
		default:
			goto e_inval;
		}

		prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
			      IPV6_PREFER_SRC_TMP);
pref_skip_pubtmp:

		/* check HOME/COA conflicts */
		switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
		case IPV6_PREFER_SRC_HOME:
			break;
		case IPV6_PREFER_SRC_COA:
			pref |= IPV6_PREFER_SRC_COA;
		case 0:
			goto pref_skip_coa;
		default:
			goto e_inval;
		}

		prefmask &= ~IPV6_PREFER_SRC_COA;
pref_skip_coa:

		/* check CGA/NONCGA conflicts */
		switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
		case IPV6_PREFER_SRC_CGA:
		case IPV6_PREFER_SRC_NONCGA:
		case 0:
			break;
		default:
			goto e_inval;
		}

		np->srcprefs = (np->srcprefs & prefmask) | pref;
		retv = 0;

		break;
	    }
855 856 857 858 859 860
	case IPV6_MINHOPCOUNT:
		if (optlen < sizeof(int))
			goto e_inval;
		if (val < 0 || val > 255)
			goto e_inval;
		np->min_hopcount = val;
861
		retv = 0;
862 863 864
		break;
	case IPV6_DONTFRAG:
		np->dontfrag = valbool;
865 866
		retv = 0;
		break;
867 868 869 870
	case IPV6_AUTOFLOWLABEL:
		np->autoflowlabel = valbool;
		retv = 0;
		break;
L
Linus Torvalds 已提交
871
	}
872

L
Linus Torvalds 已提交
873
	release_sock(sk);
874 875
	if (needs_rtnl)
		rtnl_unlock();
L
Linus Torvalds 已提交
876 877 878 879 880

	return retv;

e_inval:
	release_sock(sk);
881 882
	if (needs_rtnl)
		rtnl_unlock();
L
Linus Torvalds 已提交
883 884 885
	return -EINVAL;
}

886
int ipv6_setsockopt(struct sock *sk, int level, int optname,
887
		    char __user *optval, unsigned int optlen)
888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909
{
	int err;

	if (level == SOL_IP && sk->sk_type != SOCK_RAW)
		return udp_prot.setsockopt(sk, level, optname, optval, optlen);

	if (level != SOL_IPV6)
		return -ENOPROTOOPT;

	err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
#ifdef CONFIG_NETFILTER
	/* we need to exclude all possible ENOPROTOOPTs except default case */
	if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
			optname != IPV6_XFRM_POLICY) {
		lock_sock(sk);
		err = nf_setsockopt(sk, PF_INET6, optname, optval,
				optlen);
		release_sock(sk);
	}
#endif
	return err;
}
910
EXPORT_SYMBOL(ipv6_setsockopt);
911 912 913

#ifdef CONFIG_COMPAT
int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
914
			   char __user *optval, unsigned int optlen)
915 916 917 918
{
	int err;

	if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
919 920 921 922
		if (udp_prot.compat_setsockopt != NULL)
			return udp_prot.compat_setsockopt(sk, level, optname,
							  optval, optlen);
		return udp_prot.setsockopt(sk, level, optname, optval, optlen);
923 924 925 926 927
	}

	if (level != SOL_IPV6)
		return -ENOPROTOOPT;

928 929 930 931
	if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
		return compat_mc_setsockopt(sk, level, optname, optval, optlen,
			ipv6_setsockopt);

932 933 934 935
	err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
#ifdef CONFIG_NETFILTER
	/* we need to exclude all possible ENOPROTOOPTs except default case */
	if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
936
	    optname != IPV6_XFRM_POLICY) {
937
		lock_sock(sk);
938 939
		err = compat_nf_setsockopt(sk, PF_INET6, optname,
					   optval, optlen);
940 941 942 943 944
		release_sock(sk);
	}
#endif
	return err;
}
945
EXPORT_SYMBOL(compat_ipv6_setsockopt);
946 947
#endif

948
static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
949
				  int optname, char __user *optval, int len)
950
{
951 952
	struct ipv6_opt_hdr *hdr;

953 954 955
	if (!opt)
		return 0;

956
	switch (optname) {
957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973
	case IPV6_HOPOPTS:
		hdr = opt->hopopt;
		break;
	case IPV6_RTHDRDSTOPTS:
		hdr = opt->dst0opt;
		break;
	case IPV6_RTHDR:
		hdr = (struct ipv6_opt_hdr *)opt->srcrt;
		break;
	case IPV6_DSTOPTS:
		hdr = opt->dst1opt;
		break;
	default:
		return -EINVAL;	/* should not happen */
	}

	if (!hdr)
974
		return 0;
975

976
	len = min_t(unsigned int, len, ipv6_optlen(hdr));
977
	if (copy_to_user(optval, hdr, len))
978
		return -EFAULT;
979
	return len;
980 981
}

982
static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
983
		    char __user *optval, int __user *optlen, unsigned int flags)
L
Linus Torvalds 已提交
984 985 986 987 988
{
	struct ipv6_pinfo *np = inet6_sk(sk);
	int len;
	int val;

989 990 991
	if (ip6_mroute_opt(optname))
		return ip6_mroute_getsockopt(sk, optname, optval, optlen);

L
Linus Torvalds 已提交
992 993 994 995 996
	if (get_user(len, optlen))
		return -EFAULT;
	switch (optname) {
	case IPV6_ADDRFORM:
		if (sk->sk_protocol != IPPROTO_UDP &&
997
		    sk->sk_protocol != IPPROTO_UDPLITE &&
L
Linus Torvalds 已提交
998
		    sk->sk_protocol != IPPROTO_TCP)
999
			return -ENOPROTOOPT;
L
Linus Torvalds 已提交
1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012
		if (sk->sk_state != TCP_ESTABLISHED)
			return -ENOTCONN;
		val = sk->sk_family;
		break;
	case MCAST_MSFILTER:
	{
		struct group_filter gsf;
		int err;

		if (len < GROUP_FILTER_SIZE(0))
			return -EINVAL;
		if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
			return -EFAULT;
1013 1014
		if (gsf.gf_group.ss_family != AF_INET6)
			return -EADDRNOTAVAIL;
L
Linus Torvalds 已提交
1015 1016 1017 1018 1019 1020 1021
		lock_sock(sk);
		err = ip6_mc_msfget(sk, &gsf,
			(struct group_filter __user *)optval, optlen);
		release_sock(sk);
		return err;
	}

1022
	case IPV6_2292PKTOPTIONS:
L
Linus Torvalds 已提交
1023 1024 1025 1026 1027 1028 1029 1030 1031
	{
		struct msghdr msg;
		struct sk_buff *skb;

		if (sk->sk_type != SOCK_STREAM)
			return -ENOPROTOOPT;

		msg.msg_control = optval;
		msg.msg_controllen = len;
1032
		msg.msg_flags = flags;
L
Linus Torvalds 已提交
1033 1034 1035 1036

		lock_sock(sk);
		skb = np->pktoptions;
		if (skb)
1037
			ip6_datagram_recv_ctl(sk, &msg, skb);
1038 1039
		release_sock(sk);
		if (!skb) {
L
Linus Torvalds 已提交
1040 1041
			if (np->rxopt.bits.rxinfo) {
				struct in6_pktinfo src_info;
1042 1043
				src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
					np->sticky_pktinfo.ipi6_ifindex;
1044
				src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr;
L
Linus Torvalds 已提交
1045 1046 1047 1048 1049 1050
				put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
			}
			if (np->rxopt.bits.rxhlim) {
				int hlim = np->mcast_hops;
				put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
			}
1051
			if (np->rxopt.bits.rxtclass) {
1052 1053
				int tclass = (int)ip6_tclass(np->rcv_flowinfo);

1054 1055
				put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
			}
1056 1057
			if (np->rxopt.bits.rxoinfo) {
				struct in6_pktinfo src_info;
1058 1059
				src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
					np->sticky_pktinfo.ipi6_ifindex;
1060 1061
				src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr :
								     np->sticky_pktinfo.ipi6_addr;
1062 1063 1064 1065 1066 1067
				put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
			}
			if (np->rxopt.bits.rxohlim) {
				int hlim = np->mcast_hops;
				put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
			}
1068
			if (np->rxopt.bits.rxflow) {
1069 1070
				__be32 flowinfo = np->rcv_flowinfo;

1071 1072
				put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
			}
L
Linus Torvalds 已提交
1073 1074 1075 1076 1077 1078 1079
		}
		len -= msg.msg_controllen;
		return put_user(len, optlen);
	}
	case IPV6_MTU:
	{
		struct dst_entry *dst;
E
Eric Dumazet 已提交
1080

1081
		val = 0;
E
Eric Dumazet 已提交
1082 1083 1084
		rcu_read_lock();
		dst = __sk_dst_get(sk);
		if (dst)
L
Linus Torvalds 已提交
1085
			val = dst_mtu(dst);
E
Eric Dumazet 已提交
1086
		rcu_read_unlock();
L
Linus Torvalds 已提交
1087 1088 1089 1090 1091 1092
		if (!val)
			return -ENOTCONN;
		break;
	}

	case IPV6_V6ONLY:
1093
		val = sk->sk_ipv6only;
L
Linus Torvalds 已提交
1094 1095
		break;

1096
	case IPV6_RECVPKTINFO:
L
Linus Torvalds 已提交
1097 1098 1099
		val = np->rxopt.bits.rxinfo;
		break;

1100 1101 1102 1103 1104
	case IPV6_2292PKTINFO:
		val = np->rxopt.bits.rxoinfo;
		break;

	case IPV6_RECVHOPLIMIT:
L
Linus Torvalds 已提交
1105 1106 1107
		val = np->rxopt.bits.rxhlim;
		break;

1108 1109 1110 1111 1112
	case IPV6_2292HOPLIMIT:
		val = np->rxopt.bits.rxohlim;
		break;

	case IPV6_RECVRTHDR:
L
Linus Torvalds 已提交
1113 1114 1115
		val = np->rxopt.bits.srcrt;
		break;

1116 1117 1118 1119
	case IPV6_2292RTHDR:
		val = np->rxopt.bits.osrcrt;
		break;

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	case IPV6_HOPOPTS:
1121 1122 1123 1124
	case IPV6_RTHDRDSTOPTS:
	case IPV6_RTHDR:
	case IPV6_DSTOPTS:
	{
1125
		struct ipv6_txoptions *opt;
1126 1127

		lock_sock(sk);
1128 1129
		opt = rcu_dereference_protected(np->opt,
						lockdep_sock_is_held(sk));
1130
		len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len);
1131
		release_sock(sk);
1132 1133 1134
		/* check if ipv6_getsockopt_sticky() returns err code */
		if (len < 0)
			return len;
1135 1136 1137 1138
		return put_user(len, optlen);
	}

	case IPV6_RECVHOPOPTS:
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		val = np->rxopt.bits.hopopts;
		break;

1142 1143 1144 1145 1146
	case IPV6_2292HOPOPTS:
		val = np->rxopt.bits.ohopopts;
		break;

	case IPV6_RECVDSTOPTS:
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		val = np->rxopt.bits.dstopts;
		break;

1150 1151 1152 1153
	case IPV6_2292DSTOPTS:
		val = np->rxopt.bits.odstopts;
		break;

1154 1155 1156 1157 1158 1159 1160 1161
	case IPV6_TCLASS:
		val = np->tclass;
		break;

	case IPV6_RECVTCLASS:
		val = np->rxopt.bits.rxtclass;
		break;

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	case IPV6_FLOWINFO:
		val = np->rxopt.bits.rxflow;
		break;

1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196
	case IPV6_RECVPATHMTU:
		val = np->rxopt.bits.rxpmtu;
		break;

	case IPV6_PATHMTU:
	{
		struct dst_entry *dst;
		struct ip6_mtuinfo mtuinfo;

		if (len < sizeof(mtuinfo))
			return -EINVAL;

		len = sizeof(mtuinfo);
		memset(&mtuinfo, 0, sizeof(mtuinfo));

		rcu_read_lock();
		dst = __sk_dst_get(sk);
		if (dst)
			mtuinfo.ip6m_mtu = dst_mtu(dst);
		rcu_read_unlock();
		if (!mtuinfo.ip6m_mtu)
			return -ENOTCONN;

		if (put_user(len, optlen))
			return -EFAULT;
		if (copy_to_user(optval, &mtuinfo, len))
			return -EFAULT;

		return 0;
	}

1197 1198 1199 1200 1201 1202 1203 1204
	case IPV6_TRANSPARENT:
		val = inet_sk(sk)->transparent;
		break;

	case IPV6_RECVORIGDSTADDR:
		val = np->rxopt.bits.rxorigdstaddr;
		break;

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	case IPV6_UNICAST_HOPS:
	case IPV6_MULTICAST_HOPS:
1207 1208 1209 1210 1211 1212 1213 1214
	{
		struct dst_entry *dst;

		if (optname == IPV6_UNICAST_HOPS)
			val = np->hop_limit;
		else
			val = np->mcast_hops;

E
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		if (val < 0) {
			rcu_read_lock();
			dst = __sk_dst_get(sk);
			if (dst)
1219
				val = ip6_dst_hoplimit(dst);
E
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			rcu_read_unlock();
1221
		}
E
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1223
		if (val < 0)
1224
			val = sock_net(sk)->ipv6.devconf_all->hop_limit;
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1225
		break;
1226
	}
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	case IPV6_MULTICAST_LOOP:
		val = np->mc_loop;
		break;

	case IPV6_MULTICAST_IF:
		val = np->mcast_oif;
		break;

1236 1237 1238 1239
	case IPV6_UNICAST_IF:
		val = (__force int)htonl((__u32) np->ucast_oif);
		break;

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1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251
	case IPV6_MTU_DISCOVER:
		val = np->pmtudisc;
		break;

	case IPV6_RECVERR:
		val = np->recverr;
		break;

	case IPV6_FLOWINFO_SEND:
		val = np->sndflow;
		break;

1252 1253 1254
	case IPV6_FLOWLABEL_MGR:
	{
		struct in6_flowlabel_req freq;
1255
		int flags;
1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266

		if (len < sizeof(freq))
			return -EINVAL;

		if (copy_from_user(&freq, optval, sizeof(freq)))
			return -EFAULT;

		if (freq.flr_action != IPV6_FL_A_GET)
			return -EINVAL;

		len = sizeof(freq);
1267 1268
		flags = freq.flr_flags;

1269 1270
		memset(&freq, 0, sizeof(freq));

1271
		val = ipv6_flowlabel_opt_get(sk, &freq, flags);
1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282
		if (val < 0)
			return val;

		if (put_user(len, optlen))
			return -EFAULT;
		if (copy_to_user(optval, &freq, len))
			return -EFAULT;

		return 0;
	}

1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299
	case IPV6_ADDR_PREFERENCES:
		val = 0;

		if (np->srcprefs & IPV6_PREFER_SRC_TMP)
			val |= IPV6_PREFER_SRC_TMP;
		else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
			val |= IPV6_PREFER_SRC_PUBLIC;
		else {
			/* XXX: should we return system default? */
			val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
		}

		if (np->srcprefs & IPV6_PREFER_SRC_COA)
			val |= IPV6_PREFER_SRC_COA;
		else
			val |= IPV6_PREFER_SRC_HOME;
		break;
1300 1301 1302 1303

	case IPV6_MINHOPCOUNT:
		val = np->min_hopcount;
		break;
1304 1305 1306 1307

	case IPV6_DONTFRAG:
		val = np->dontfrag;
		break;
1308

1309 1310 1311 1312
	case IPV6_AUTOFLOWLABEL:
		val = np->autoflowlabel;
		break;

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1313
	default:
1314
		return -ENOPROTOOPT;
L
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1315 1316
	}
	len = min_t(unsigned int, sizeof(int), len);
1317
	if (put_user(len, optlen))
L
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1318
		return -EFAULT;
1319
	if (copy_to_user(optval, &val, len))
L
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1320 1321 1322 1323
		return -EFAULT;
	return 0;
}

1324 1325 1326 1327 1328 1329 1330 1331
int ipv6_getsockopt(struct sock *sk, int level, int optname,
		    char __user *optval, int __user *optlen)
{
	int err;

	if (level == SOL_IP && sk->sk_type != SOCK_RAW)
		return udp_prot.getsockopt(sk, level, optname, optval, optlen);

1332
	if (level != SOL_IPV6)
1333 1334
		return -ENOPROTOOPT;

1335
	err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0);
1336
#ifdef CONFIG_NETFILTER
1337 1338
	/* we need to exclude all possible ENOPROTOOPTs except default case */
	if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353
		int len;

		if (get_user(len, optlen))
			return -EFAULT;

		lock_sock(sk);
		err = nf_getsockopt(sk, PF_INET6, optname, optval,
				&len);
		release_sock(sk);
		if (err >= 0)
			err = put_user(len, optlen);
	}
#endif
	return err;
}
1354 1355
EXPORT_SYMBOL(ipv6_getsockopt);

1356 1357
#ifdef CONFIG_COMPAT
int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1358
			   char __user *optval, int __user *optlen)
1359 1360 1361 1362
{
	int err;

	if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1363 1364 1365 1366
		if (udp_prot.compat_getsockopt != NULL)
			return udp_prot.compat_getsockopt(sk, level, optname,
							  optval, optlen);
		return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1367 1368
	}

1369
	if (level != SOL_IPV6)
1370 1371
		return -ENOPROTOOPT;

1372 1373 1374 1375
	if (optname == MCAST_MSFILTER)
		return compat_mc_getsockopt(sk, level, optname, optval, optlen,
			ipv6_getsockopt);

1376 1377
	err = do_ipv6_getsockopt(sk, level, optname, optval, optlen,
				 MSG_CMSG_COMPAT);
1378
#ifdef CONFIG_NETFILTER
1379 1380
	/* we need to exclude all possible ENOPROTOOPTs except default case */
	if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1381 1382 1383 1384 1385 1386
		int len;

		if (get_user(len, optlen))
			return -EFAULT;

		lock_sock(sk);
1387 1388
		err = compat_nf_getsockopt(sk, PF_INET6,
					   optname, optval, &len);
1389 1390 1391 1392 1393 1394 1395
		release_sock(sk);
		if (err >= 0)
			err = put_user(len, optlen);
	}
#endif
	return err;
}
1396
EXPORT_SYMBOL(compat_ipv6_getsockopt);
1397 1398
#endif