ipv6_sockglue.c 24.9 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
 *
 *	$Id: ipv6_sockglue.c,v 1.41 2002/02/01 22:01:04 davem Exp $
 *
 *	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>

#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>

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DEFINE_SNMP_STAT(struct ipstats_mib, ipv6_statistics) __read_mostly;
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struct ip6_ra_chain *ip6_ra_chain;
DEFINE_RWLOCK(ip6_ra_lock);

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

	/* RA packet may be delivered ONLY to IPPROTO_RAW socket */
	if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num != IPPROTO_RAW)
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		return -ENOPROTOOPT;
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	new_ra = (sel>=0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;

	write_lock_bh(&ip6_ra_lock);
	for (rap = &ip6_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
		if (ra->sk == sk) {
			if (sel>=0) {
				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);

			if (ra->destructor)
				ra->destructor(sk);
			sock_put(sk);
			kfree(ra);
			return 0;
		}
	}
	if (new_ra == NULL) {
		write_unlock_bh(&ip6_ra_lock);
		return -ENOBUFS;
	}
	new_ra->sk = sk;
	new_ra->sel = sel;
	new_ra->destructor = destructor;
	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)) &&
		    inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
			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);
		}
		opt = xchg(&inet6_sk(sk)->opt, opt);
	} else {
		write_lock(&sk->sk_dst_lock);
		opt = xchg(&inet6_sk(sk)->opt, opt);
		write_unlock(&sk->sk_dst_lock);
	}
	sk_dst_reset(sk);

	return opt;
}

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static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
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		    char __user *optval, int optlen)
{
	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;

	if (optval == NULL)
		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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	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(&np->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;
			}
			opt = xchg(&np->opt, NULL);
			if (opt)
				sock_kfree_s(sk, opt, opt->tot_len);
			pktopt = xchg(&np->pktoptions, NULL);
			if (pktopt)
				kfree_skb(pktopt);

			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) ||
		    inet_sk(sk)->num)
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			goto e_inval;
		np->ipv6only = valbool;
		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;
		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_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 (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;
		if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
			break;

		opt = ipv6_renew_options(sk, np->opt, optname,
					 (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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		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 defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
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			case IPV6_SRCRT_TYPE_2:
				break;
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#endif
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			default:
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				goto sticky_done;
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			}

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			if ((rthdr->hdrlen & 1) ||
			    (rthdr->hdrlen >> 1) != rthdr->segments_left)
				goto sticky_done;
		}

		retv = 0;
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		opt = ipv6_update_options(sk, opt);
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sticky_done:
		if (opt)
			sock_kfree_s(sk, opt, opt->tot_len);
		break;
	}

	case IPV6_2292PKTOPTIONS:
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	{
		struct ipv6_txoptions *opt = NULL;
		struct msghdr msg;
		struct flowi fl;
		int junk;

		fl.fl6_flowlabel = 0;
		fl.oif = sk->sk_bound_dev_if;

		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;
		if (opt == NULL)
			break;

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

		msg.msg_controllen = optlen;
		msg.msg_control = (void*)(opt+1);

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		retv = datagram_send_ctl(net, &msg, &fl, opt, &junk, &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:
		if (opt)
			sock_kfree_s(sk, opt, opt->tot_len);
		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;
		np->mcast_hops = val;
		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;

	case IPV6_MULTICAST_IF:
		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) {
			if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
				goto e_inval;

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			if (__dev_get_by_index(net, val) == NULL) {
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				retv = -ENODEV;
				break;
			}
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		}
		np->mcast_oif = val;
		retv = 0;
		break;
	case IPV6_ADD_MEMBERSHIP:
	case IPV6_DROP_MEMBERSHIP:
	{
		struct ipv6_mreq mreq;

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		if (optlen < sizeof(struct ipv6_mreq))
			goto e_inval;

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		retv = -EPROTO;
		if (inet_sk(sk)->is_icsk)
			break;

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

		if (optname == IPV6_ADD_MEMBERSHIP)
			retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
		else
			retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
		break;
	}
	case IPV6_JOIN_ANYCAST:
	case IPV6_LEAVE_ANYCAST:
	{
		struct ipv6_mreq mreq;

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		if (optlen < sizeof(struct ipv6_mreq))
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			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;

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		if (optlen < sizeof(struct group_req))
			goto e_inval;

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		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)
			retv = ipv6_sock_mc_join(sk, greq.gr_interface,
				&psin6->sin6_addr);
		else
			retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
				&psin6->sin6_addr);
		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;

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		if (optlen < sizeof(struct group_source_req))
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			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;
			retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
				&psin6->sin6_addr);
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			/* prior join w/ different source is ok */
			if (retv && retv != -EADDRINUSE)
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				break;
			omode = MCAST_INCLUDE;
			add = 1;
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		} else /* MCAST_LEAVE_SOURCE_GROUP */ {
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590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606
			omode = MCAST_INCLUDE;
			add = 0;
		}
		retv = ip6_mc_source(add, omode, sk, &greqs);
		break;
	}
	case MCAST_MSFILTER:
	{
		extern int sysctl_mld_max_msf;
		struct group_filter *gsf;

		if (optlen < GROUP_FILTER_SIZE(0))
			goto e_inval;
		if (optlen > sysctl_optmem_max) {
			retv = -ENOBUFS;
			break;
		}
607
		gsf = kmalloc(optlen,GFP_KERNEL);
S
Stephen Hemminger 已提交
608
		if (!gsf) {
L
Linus Torvalds 已提交
609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634
			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:
635 636
		if (optlen < sizeof(int))
			goto e_inval;
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637 638 639
		retv = ip6_ra_control(sk, val, NULL);
		break;
	case IPV6_MTU_DISCOVER:
640 641
		if (optlen < sizeof(int))
			goto e_inval;
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John Heffner 已提交
642
		if (val<0 || val>3)
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643 644 645 646 647
			goto e_inval;
		np->pmtudisc = val;
		retv = 0;
		break;
	case IPV6_MTU:
648 649
		if (optlen < sizeof(int))
			goto e_inval;
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650 651 652 653 654 655
		if (val && val < IPV6_MIN_MTU)
			goto e_inval;
		np->frag_size = val;
		retv = 0;
		break;
	case IPV6_RECVERR:
656 657
		if (optlen < sizeof(int))
			goto e_inval;
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		np->recverr = valbool;
		if (!val)
			skb_queue_purge(&sk->sk_error_queue);
		retv = 0;
		break;
	case IPV6_FLOWINFO_SEND:
664 665
		if (optlen < sizeof(int))
			goto e_inval;
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		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:
674 675 676
		retv = -EPERM;
		if (!capable(CAP_NET_ADMIN))
			break;
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		retv = xfrm_user_policy(sk, optname, optval, optlen);
		break;

680 681 682 683 684
	case IPV6_ADDR_PREFERENCES:
	    {
		unsigned int pref = 0;
		unsigned int prefmask = ~0;

685 686 687
		if (optlen < sizeof(int))
			goto e_inval;

688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741
		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;
	    }
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	}
743

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	release_sock(sk);

	return retv;

e_inval:
	release_sock(sk);
	return -EINVAL;
}

753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777
int ipv6_setsockopt(struct sock *sk, int level, int optname,
		    char __user *optval, int optlen)
{
	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;
}

778
EXPORT_SYMBOL(ipv6_setsockopt);
779 780 781

#ifdef CONFIG_COMPAT
int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
782
			   char __user *optval, int optlen)
783 784 785 786
{
	int err;

	if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
787 788 789 790
		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);
791 792 793 794 795
	}

	if (level != SOL_IPV6)
		return -ENOPROTOOPT;

796 797 798 799
	if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
		return compat_mc_setsockopt(sk, level, optname, optval, optlen,
			ipv6_setsockopt);

800 801 802 803
	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 &&
804
	    optname != IPV6_XFRM_POLICY) {
805
		lock_sock(sk);
806 807
		err = compat_nf_setsockopt(sk, PF_INET6, optname,
					   optval, optlen);
808 809 810 811 812
		release_sock(sk);
	}
#endif
	return err;
}
813 814

EXPORT_SYMBOL(compat_ipv6_setsockopt);
815 816
#endif

817
static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
818
				  int optname, char __user *optval, int len)
819
{
820 821
	struct ipv6_opt_hdr *hdr;

822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842
	if (!opt)
		return 0;

	switch(optname) {
	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)
843
		return 0;
844

845
	len = min_t(unsigned int, len, ipv6_optlen(hdr));
846
	if (copy_to_user(optval, hdr, len))
847
		return -EFAULT;
848
	return len;
849 850
}

851
static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
L
Linus Torvalds 已提交
852 853 854 855 856 857
		    char __user *optval, int __user *optlen)
{
	struct ipv6_pinfo *np = inet6_sk(sk);
	int len;
	int val;

858 859 860
	if (ip6_mroute_opt(optname))
		return ip6_mroute_getsockopt(sk, optname, optval, optlen);

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861 862 863 864 865
	if (get_user(len, optlen))
		return -EFAULT;
	switch (optname) {
	case IPV6_ADDRFORM:
		if (sk->sk_protocol != IPPROTO_UDP &&
866
		    sk->sk_protocol != IPPROTO_UDPLITE &&
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Linus Torvalds 已提交
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		    sk->sk_protocol != IPPROTO_TCP)
868
			return -ENOPROTOOPT;
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		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;
882 883
		if (gsf.gf_group.ss_family != AF_INET6)
			return -EADDRNOTAVAIL;
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		lock_sock(sk);
		err = ip6_mc_msfget(sk, &gsf,
			(struct group_filter __user *)optval, optlen);
		release_sock(sk);
		return err;
	}

891
	case IPV6_2292PKTOPTIONS:
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	{
		struct msghdr msg;
		struct sk_buff *skb;

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

		msg.msg_control = optval;
		msg.msg_controllen = len;
		msg.msg_flags = 0;

		lock_sock(sk);
		skb = np->pktoptions;
		if (skb)
			atomic_inc(&skb->users);
		release_sock(sk);

		if (skb) {
			int err = datagram_recv_ctl(sk, &msg, skb);
			kfree_skb(skb);
			if (err)
				return err;
		} else {
			if (np->rxopt.bits.rxinfo) {
				struct in6_pktinfo src_info;
				src_info.ipi6_ifindex = np->mcast_oif;
				ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
				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);
			}
925 926 927 928 929 930 931 932 933 934
			if (np->rxopt.bits.rxoinfo) {
				struct in6_pktinfo src_info;
				src_info.ipi6_ifindex = np->mcast_oif;
				ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
				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);
			}
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		}
		len -= msg.msg_controllen;
		return put_user(len, optlen);
	}
	case IPV6_MTU:
	{
		struct dst_entry *dst;
942
		val = 0;
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Linus Torvalds 已提交
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		lock_sock(sk);
		dst = sk_dst_get(sk);
		if (dst) {
			val = dst_mtu(dst);
			dst_release(dst);
		}
		release_sock(sk);
		if (!val)
			return -ENOTCONN;
		break;
	}

	case IPV6_V6ONLY:
		val = np->ipv6only;
		break;

959
	case IPV6_RECVPKTINFO:
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Linus Torvalds 已提交
960 961 962
		val = np->rxopt.bits.rxinfo;
		break;

963 964 965 966 967
	case IPV6_2292PKTINFO:
		val = np->rxopt.bits.rxoinfo;
		break;

	case IPV6_RECVHOPLIMIT:
L
Linus Torvalds 已提交
968 969 970
		val = np->rxopt.bits.rxhlim;
		break;

971 972 973 974 975
	case IPV6_2292HOPLIMIT:
		val = np->rxopt.bits.rxohlim;
		break;

	case IPV6_RECVRTHDR:
L
Linus Torvalds 已提交
976 977 978
		val = np->rxopt.bits.srcrt;
		break;

979 980 981 982
	case IPV6_2292RTHDR:
		val = np->rxopt.bits.osrcrt;
		break;

L
Linus Torvalds 已提交
983
	case IPV6_HOPOPTS:
984 985 986 987 988 989
	case IPV6_RTHDRDSTOPTS:
	case IPV6_RTHDR:
	case IPV6_DSTOPTS:
	{

		lock_sock(sk);
990
		len = ipv6_getsockopt_sticky(sk, np->opt,
991
					     optname, optval, len);
992
		release_sock(sk);
993 994 995
		/* check if ipv6_getsockopt_sticky() returns err code */
		if (len < 0)
			return len;
996 997 998 999
		return put_user(len, optlen);
	}

	case IPV6_RECVHOPOPTS:
L
Linus Torvalds 已提交
1000 1001 1002
		val = np->rxopt.bits.hopopts;
		break;

1003 1004 1005 1006 1007
	case IPV6_2292HOPOPTS:
		val = np->rxopt.bits.ohopopts;
		break;

	case IPV6_RECVDSTOPTS:
L
Linus Torvalds 已提交
1008 1009 1010
		val = np->rxopt.bits.dstopts;
		break;

1011 1012 1013 1014
	case IPV6_2292DSTOPTS:
		val = np->rxopt.bits.odstopts;
		break;

1015 1016
	case IPV6_TCLASS:
		val = np->tclass;
1017 1018
		if (val < 0)
			val = 0;
1019 1020 1021 1022 1023 1024
		break;

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

L
Linus Torvalds 已提交
1025 1026 1027 1028 1029 1030
	case IPV6_FLOWINFO:
		val = np->rxopt.bits.rxflow;
		break;

	case IPV6_UNICAST_HOPS:
	case IPV6_MULTICAST_HOPS:
1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041
	{
		struct dst_entry *dst;

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

		dst = sk_dst_get(sk);
		if (dst) {
			if (val < 0)
1042
				val = ip6_dst_hoplimit(dst);
1043 1044 1045 1046
			dst_release(dst);
		}
		if (val < 0)
			val = ipv6_devconf.hop_limit;
L
Linus Torvalds 已提交
1047
		break;
1048
	}
L
Linus Torvalds 已提交
1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069

	case IPV6_MULTICAST_LOOP:
		val = np->mc_loop;
		break;

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

	case IPV6_MTU_DISCOVER:
		val = np->pmtudisc;
		break;

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

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

1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087
	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;

L
Linus Torvalds 已提交
1088
	default:
1089
		return -ENOPROTOOPT;
L
Linus Torvalds 已提交
1090 1091 1092 1093 1094 1095 1096 1097 1098
	}
	len = min_t(unsigned int, sizeof(int), len);
	if(put_user(len, optlen))
		return -EFAULT;
	if(copy_to_user(optval,&val,len))
		return -EFAULT;
	return 0;
}

1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111
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);

	if(level != SOL_IPV6)
		return -ENOPROTOOPT;

	err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
#ifdef CONFIG_NETFILTER
1112 1113
	/* we need to exclude all possible ENOPROTOOPTs except default case */
	if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129
		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;
}

1130 1131
EXPORT_SYMBOL(ipv6_getsockopt);

1132 1133
#ifdef CONFIG_COMPAT
int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1134
			   char __user *optval, int __user *optlen)
1135 1136 1137 1138
{
	int err;

	if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1139 1140 1141 1142
		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);
1143 1144
	}

1145
	if (level != SOL_IPV6)
1146 1147
		return -ENOPROTOOPT;

1148 1149 1150 1151
	if (optname == MCAST_MSFILTER)
		return compat_mc_getsockopt(sk, level, optname, optval, optlen,
			ipv6_getsockopt);

1152 1153
	err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
#ifdef CONFIG_NETFILTER
1154 1155
	/* we need to exclude all possible ENOPROTOOPTs except default case */
	if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1156 1157 1158 1159 1160 1161
		int len;

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

		lock_sock(sk);
1162 1163
		err = compat_nf_getsockopt(sk, PF_INET6,
					   optname, optval, &len);
1164 1165 1166 1167 1168 1169 1170
		release_sock(sk);
		if (err >= 0)
			err = put_user(len, optlen);
	}
#endif
	return err;
}
1171 1172

EXPORT_SYMBOL(compat_ipv6_getsockopt);
1173 1174
#endif