1 files changed, 10 insertions, 295 deletions

diff --git a/net/netfilter/xt_socket.c b/net/netfilter/xt_socket.c
index b10ade272b50..2198914707f5 100644
--- a/net/netfilter/xt_socket.c
+++ b/net/netfilter/xt_socket.c
@@ -22,76 +22,14 @@
 #include <net/netfilter/ipv4/nf_defrag_ipv4.h>
 
 #if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
-#define XT_SOCKET_HAVE_IPV6 1
 #include <linux/netfilter_ipv6/ip6_tables.h>
 #include <net/inet6_hashtables.h>
 #include <net/netfilter/ipv6/nf_defrag_ipv6.h>
 #endif
 
+#include <net/netfilter/nf_socket.h>
 #include <linux/netfilter/xt_socket.h>
 
-#if IS_ENABLED(CONFIG_NF_CONNTRACK)
-#define XT_SOCKET_HAVE_CONNTRACK 1
-#include <net/netfilter/nf_conntrack.h>
-#endif
-
-static int
-extract_icmp4_fields(const struct sk_buff *skb,
-		    u8 *protocol,
-		    __be32 *raddr,
-		    __be32 *laddr,
-		    __be16 *rport,
-		    __be16 *lport)
-{
-	unsigned int outside_hdrlen = ip_hdrlen(skb);
-	struct iphdr *inside_iph, _inside_iph;
-	struct icmphdr *icmph, _icmph;
-	__be16 *ports, _ports[2];
-
-	icmph = skb_header_pointer(skb, outside_hdrlen,
-				   sizeof(_icmph), &_icmph);
-	if (icmph == NULL)
-		return 1;
-
-	switch (icmph->type) {
-	case ICMP_DEST_UNREACH:
-	case ICMP_SOURCE_QUENCH:
-	case ICMP_REDIRECT:
-	case ICMP_TIME_EXCEEDED:
-	case ICMP_PARAMETERPROB:
-		break;
-	default:
-		return 1;
-	}
-
-	inside_iph = skb_header_pointer(skb, outside_hdrlen +
-					sizeof(struct icmphdr),
-					sizeof(_inside_iph), &_inside_iph);
-	if (inside_iph == NULL)
-		return 1;
-
-	if (inside_iph->protocol != IPPROTO_TCP &&
-	    inside_iph->protocol != IPPROTO_UDP)
-		return 1;
-
-	ports = skb_header_pointer(skb, outside_hdrlen +
-				   sizeof(struct icmphdr) +
-				   (inside_iph->ihl << 2),
-				   sizeof(_ports), &_ports);
-	if (ports == NULL)
-		return 1;
-
-	/* the inside IP packet is the one quoted from our side, thus
-	 * its saddr is the local address */
-	*protocol = inside_iph->protocol;
-	*laddr = inside_iph->saddr;
-	*lport = ports[0];
-	*raddr = inside_iph->daddr;
-	*rport = ports[1];
-
-	return 0;
-}
-
 /* "socket" match based redirection (no specific rule)
  * ===================================================
  *
@@ -111,104 +49,6 @@ extract_icmp4_fields(const struct sk_buff *skb,
  *     then local services could intercept traffic going through the
  *     box.
  */
-static struct sock *
-xt_socket_get_sock_v4(struct net *net, struct sk_buff *skb, const int doff,
-		      const u8 protocol,
-		      const __be32 saddr, const __be32 daddr,
-		      const __be16 sport, const __be16 dport,
-		      const struct net_device *in)
-{
-	switch (protocol) {
-	case IPPROTO_TCP:
-		return inet_lookup(net, &tcp_hashinfo, skb, doff,
-				   saddr, sport, daddr, dport,
-				   in->ifindex);
-	case IPPROTO_UDP:
-		return udp4_lib_lookup(net, saddr, sport, daddr, dport,
-				       in->ifindex);
-	}
-	return NULL;
-}
-
-static bool xt_socket_sk_is_transparent(struct sock *sk)
-{
-	switch (sk->sk_state) {
-	case TCP_TIME_WAIT:
-		return inet_twsk(sk)->tw_transparent;
-
-	case TCP_NEW_SYN_RECV:
-		return inet_rsk(inet_reqsk(sk))->no_srccheck;
-
-	default:
-		return inet_sk(sk)->transparent;
-	}
-}
-
-static struct sock *xt_socket_lookup_slow_v4(struct net *net,
-					     const struct sk_buff *skb,
-					     const struct net_device *indev)
-{
-	const struct iphdr *iph = ip_hdr(skb);
-	struct sk_buff *data_skb = NULL;
-	int doff = 0;
-	__be32 uninitialized_var(daddr), uninitialized_var(saddr);
-	__be16 uninitialized_var(dport), uninitialized_var(sport);
-	u8 uninitialized_var(protocol);
-#ifdef XT_SOCKET_HAVE_CONNTRACK
-	struct nf_conn const *ct;
-	enum ip_conntrack_info ctinfo;
-#endif
-
-	if (iph->protocol == IPPROTO_UDP || iph->protocol == IPPROTO_TCP) {
-		struct udphdr _hdr, *hp;
-
-		hp = skb_header_pointer(skb, ip_hdrlen(skb),
-					sizeof(_hdr), &_hdr);
-		if (hp == NULL)
-			return NULL;
-
-		protocol = iph->protocol;
-		saddr = iph->saddr;
-		sport = hp->source;
-		daddr = iph->daddr;
-		dport = hp->dest;
-		data_skb = (struct sk_buff *)skb;
-		doff = iph->protocol == IPPROTO_TCP ?
-			ip_hdrlen(skb) + __tcp_hdrlen((struct tcphdr *)hp) :
-			ip_hdrlen(skb) + sizeof(*hp);
-
-	} else if (iph->protocol == IPPROTO_ICMP) {
-		if (extract_icmp4_fields(skb, &protocol, &saddr, &daddr,
-					 &sport, &dport))
-			return NULL;
-	} else {
-		return NULL;
-	}
-
-#ifdef XT_SOCKET_HAVE_CONNTRACK
-	/* Do the lookup with the original socket address in
-	 * case this is a reply packet of an established
-	 * SNAT-ted connection.
-	 */
-	ct = nf_ct_get(skb, &ctinfo);
-	if (ct && !nf_ct_is_untracked(ct) &&
-	    ((iph->protocol != IPPROTO_ICMP &&
-	      ctinfo == IP_CT_ESTABLISHED_REPLY) ||
-	     (iph->protocol == IPPROTO_ICMP &&
-	      ctinfo == IP_CT_RELATED_REPLY)) &&
-	    (ct->status & IPS_SRC_NAT_DONE)) {
-
-		daddr = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u3.ip;
-		dport = (iph->protocol == IPPROTO_TCP) ?
-			ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u.tcp.port :
-			ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u.udp.port;
-	}
-#endif
-
-	return xt_socket_get_sock_v4(net, data_skb, doff, protocol, saddr,
-				     daddr, sport, dport, indev);
-}
-
 static bool
 socket_match(const struct sk_buff *skb, struct xt_action_param *par,
 	     const struct xt_socket_mtinfo1 *info)
@@ -217,7 +57,7 @@ socket_match(const struct sk_buff *skb, struct xt_action_param *par,
 	struct sock *sk = skb->sk;
 
 	if (!sk)
-		sk = xt_socket_lookup_slow_v4(par->net, skb, par->in);
+		sk = nf_sk_lookup_slow_v4(xt_net(par), skb, xt_in(par));
 	if (sk) {
 		bool wildcard;
 		bool transparent = true;
@@ -233,7 +73,7 @@ socket_match(const struct sk_buff *skb, struct xt_action_param *par,
 		 * if XT_SOCKET_TRANSPARENT is used
 		 */
 		if (info->flags & XT_SOCKET_TRANSPARENT)
-			transparent = xt_socket_sk_is_transparent(sk);
+			transparent = nf_sk_is_transparent(sk);
 
 		if (info->flags & XT_SOCKET_RESTORESKMARK && !wildcard &&
 		    transparent)
@@ -265,132 +105,7 @@ socket_mt4_v1_v2_v3(const struct sk_buff *skb, struct xt_action_param *par)
 	return socket_match(skb, par, par->matchinfo);
 }
 
-#ifdef XT_SOCKET_HAVE_IPV6
-
-static int
-extract_icmp6_fields(const struct sk_buff *skb,
-		     unsigned int outside_hdrlen,
-		     int *protocol,
-		     const struct in6_addr **raddr,
-		     const struct in6_addr **laddr,
-		     __be16 *rport,
-		     __be16 *lport,
-		     struct ipv6hdr *ipv6_var)
-{
-	const struct ipv6hdr *inside_iph;
-	struct icmp6hdr *icmph, _icmph;
-	__be16 *ports, _ports[2];
-	u8 inside_nexthdr;
-	__be16 inside_fragoff;
-	int inside_hdrlen;
-
-	icmph = skb_header_pointer(skb, outside_hdrlen,
-				   sizeof(_icmph), &_icmph);
-	if (icmph == NULL)
-		return 1;
-
-	if (icmph->icmp6_type & ICMPV6_INFOMSG_MASK)
-		return 1;
-
-	inside_iph = skb_header_pointer(skb, outside_hdrlen + sizeof(_icmph),
-					sizeof(*ipv6_var), ipv6_var);
-	if (inside_iph == NULL)
-		return 1;
-	inside_nexthdr = inside_iph->nexthdr;
-
-	inside_hdrlen = ipv6_skip_exthdr(skb, outside_hdrlen + sizeof(_icmph) +
-					      sizeof(*ipv6_var),
-					 &inside_nexthdr, &inside_fragoff);
-	if (inside_hdrlen < 0)
-		return 1; /* hjm: Packet has no/incomplete transport layer headers. */
-
-	if (inside_nexthdr != IPPROTO_TCP &&
-	    inside_nexthdr != IPPROTO_UDP)
-		return 1;
-
-	ports = skb_header_pointer(skb, inside_hdrlen,
-				   sizeof(_ports), &_ports);
-	if (ports == NULL)
-		return 1;
-
-	/* the inside IP packet is the one quoted from our side, thus
-	 * its saddr is the local address */
-	*protocol = inside_nexthdr;
-	*laddr = &inside_iph->saddr;
-	*lport = ports[0];
-	*raddr = &inside_iph->daddr;
-	*rport = ports[1];
-
-	return 0;
-}
-
-static struct sock *
-xt_socket_get_sock_v6(struct net *net, struct sk_buff *skb, int doff,
-		      const u8 protocol,
-		      const struct in6_addr *saddr, const struct in6_addr *daddr,
-		      const __be16 sport, const __be16 dport,
-		      const struct net_device *in)
-{
-	switch (protocol) {
-	case IPPROTO_TCP:
-		return inet6_lookup(net, &tcp_hashinfo, skb, doff,
-				    saddr, sport, daddr, dport,
-				    in->ifindex);
-	case IPPROTO_UDP:
-		return udp6_lib_lookup(net, saddr, sport, daddr, dport,
-				       in->ifindex);
-	}
-
-	return NULL;
-}
-
-static struct sock *xt_socket_lookup_slow_v6(struct net *net,
-					     const struct sk_buff *skb,
-					     const struct net_device *indev)
-{
-	__be16 uninitialized_var(dport), uninitialized_var(sport);
-	const struct in6_addr *daddr = NULL, *saddr = NULL;
-	struct ipv6hdr *iph = ipv6_hdr(skb);
-	struct sk_buff *data_skb = NULL;
-	int doff = 0;
-	int thoff = 0, tproto;
-
-	tproto = ipv6_find_hdr(skb, &thoff, -1, NULL, NULL);
-	if (tproto < 0) {
-		pr_debug("unable to find transport header in IPv6 packet, dropping\n");
-		return NULL;
-	}
-
-	if (tproto == IPPROTO_UDP || tproto == IPPROTO_TCP) {
-		struct udphdr _hdr, *hp;
-
-		hp = skb_header_pointer(skb, thoff, sizeof(_hdr), &_hdr);
-		if (hp == NULL)
-			return NULL;
-
-		saddr = &iph->saddr;
-		sport = hp->source;
-		daddr = &iph->daddr;
-		dport = hp->dest;
-		data_skb = (struct sk_buff *)skb;
-		doff = tproto == IPPROTO_TCP ?
-			thoff + __tcp_hdrlen((struct tcphdr *)hp) :
-			thoff + sizeof(*hp);
-
-	} else if (tproto == IPPROTO_ICMPV6) {
-		struct ipv6hdr ipv6_var;
-
-		if (extract_icmp6_fields(skb, thoff, &tproto, &saddr, &daddr,
-					 &sport, &dport, &ipv6_var))
-			return NULL;
-	} else {
-		return NULL;
-	}
-
-	return xt_socket_get_sock_v6(net, data_skb, doff, tproto, saddr, daddr,
-				     sport, dport, indev);
-}
-
+#if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
 static bool
 socket_mt6_v1_v2_v3(const struct sk_buff *skb, struct xt_action_param *par)
 {
@@ -399,7 +114,7 @@ socket_mt6_v1_v2_v3(const struct sk_buff *skb, struct xt_action_param *par)
 	struct sock *sk = skb->sk;
 
 	if (!sk)
-		sk = xt_socket_lookup_slow_v6(par->net, skb, par->in);
+		sk = nf_sk_lookup_slow_v6(xt_net(par), skb, xt_in(par));
 	if (sk) {
 		bool wildcard;
 		bool transparent = true;
@@ -415,7 +130,7 @@ socket_mt6_v1_v2_v3(const struct sk_buff *skb, struct xt_action_param *par)
 		 * if XT_SOCKET_TRANSPARENT is used
 		 */
 		if (info->flags & XT_SOCKET_TRANSPARENT)
-			transparent = xt_socket_sk_is_transparent(sk);
+			transparent = nf_sk_is_transparent(sk);
 
 		if (info->flags & XT_SOCKET_RESTORESKMARK && !wildcard &&
 		    transparent)
@@ -488,7 +203,7 @@ static struct xt_match socket_mt_reg[] __read_mostly = {
 				  (1 << NF_INET_LOCAL_IN),
 		.me		= THIS_MODULE,
 	},
-#ifdef XT_SOCKET_HAVE_IPV6
+#if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
 	{
 		.name		= "socket",
 		.revision	= 1,
@@ -512,7 +227,7 @@ static struct xt_match socket_mt_reg[] __read_mostly = {
 				  (1 << NF_INET_LOCAL_IN),
 		.me		= THIS_MODULE,
 	},
-#ifdef XT_SOCKET_HAVE_IPV6
+#if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
 	{
 		.name		= "socket",
 		.revision	= 2,
@@ -536,7 +251,7 @@ static struct xt_match socket_mt_reg[] __read_mostly = {
 				  (1 << NF_INET_LOCAL_IN),
 		.me		= THIS_MODULE,
 	},
-#ifdef XT_SOCKET_HAVE_IPV6
+#if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
 	{
 		.name		= "socket",
 		.revision	= 3,
@@ -554,7 +269,7 @@ static struct xt_match socket_mt_reg[] __read_mostly = {
 static int __init socket_mt_init(void)
 {
 	nf_defrag_ipv4_enable();
-#ifdef XT_SOCKET_HAVE_IPV6
+#if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
 	nf_defrag_ipv6_enable();
 #endif