@@ -130,7 +130,7 @@ struct inet_timewait_sock {
/* And these are ours. */
__u8 tw_ipv6only:1,
tw_transparent:1;
- /* 15 bits hole, try to pack */
+ /* 14 bits hole, try to pack */
__u16 tw_ipv6_offset;
unsigned long tw_ttd;
struct inet_bind_bucket *tw_tb;
@@ -8,12 +8,16 @@
#include <net/inet_sock.h>
#include <net/tcp.h>
+#define NFT_LOOKUP_ANY 0
+#define NFT_LOOKUP_LISTENER 1
+#define NFT_LOOKUP_ESTABLISHED 2
+
/* look up and get a reference to a matching socket */
extern struct sock *
nf_tproxy_get_sock_v4(struct net *net, const u8 protocol,
const __be32 saddr, const __be32 daddr,
const __be16 sport, const __be16 dport,
- const struct net_device *in, bool listening);
+ const struct net_device *in, int lookup_type);
static inline void
nf_tproxy_put_sock(struct sock *sk)
@@ -22,21 +22,34 @@ struct sock *
nf_tproxy_get_sock_v4(struct net *net, const u8 protocol,
const __be32 saddr, const __be32 daddr,
const __be16 sport, const __be16 dport,
- const struct net_device *in, bool listening_only)
+ const struct net_device *in, int lookup_type)
{
struct sock *sk;
/* look up socket */
switch (protocol) {
case IPPROTO_TCP:
- if (listening_only)
- sk = __inet_lookup_listener(net, &tcp_hashinfo,
- daddr, ntohs(dport),
- in->ifindex);
- else
+ switch (lookup_type) {
+ case NFT_LOOKUP_ANY:
sk = __inet_lookup(net, &tcp_hashinfo,
saddr, sport, daddr, dport,
in->ifindex);
+ break;
+ case NFT_LOOKUP_LISTENER:
+ sk = inet_lookup_listener(net, &tcp_hashinfo,
+ daddr, dport,
+ in->ifindex);
+ break;
+ case NFT_LOOKUP_ESTABLISHED:
+ sk = inet_lookup_established(net, &tcp_hashinfo,
+ saddr, sport, daddr, dport,
+ in->ifindex);
+ break;
+ default:
+ WARN_ON(1);
+ sk = NULL;
+ break;
+ }
break;
case IPPROTO_UDP:
sk = udp4_lib_lookup(net, saddr, sport, daddr, dport,
@@ -47,8 +60,8 @@ nf_tproxy_get_sock_v4(struct net *net, const u8 protocol,
sk = NULL;
}
- pr_debug("tproxy socket lookup: proto %u %08x:%u -> %08x:%u, listener only: %d, sock %p\n",
- protocol, ntohl(saddr), ntohs(sport), ntohl(daddr), ntohs(dport), listening_only, sk);
+ pr_debug("tproxy socket lookup: proto %u %08x:%u -> %08x:%u, lookup type: %d, sock %p\n",
+ protocol, ntohl(saddr), ntohs(sport), ntohl(daddr), ntohs(dport), lookup_type, sk);
return sk;
}
@@ -29,7 +29,7 @@ tproxy_tg(struct sk_buff *skb, const struct xt_target_param *par)
{
const struct iphdr *iph = ip_hdr(skb);
const struct xt_tproxy_target_info *tgi = par->targinfo;
- struct udphdr _hdr, *hp;
+ struct tcphdr _hdr, *hp;
struct sock *sk;
hp = skb_header_pointer(skb, ip_hdrlen(skb), sizeof(_hdr), &_hdr);
@@ -37,10 +37,29 @@ tproxy_tg(struct sk_buff *skb, const struct xt_target_param *par)
return NF_DROP;
sk = nf_tproxy_get_sock_v4(dev_net(skb->dev), iph->protocol,
- iph->saddr, tgi->laddr ? tgi->laddr : iph->daddr,
- hp->source, tgi->lport ? tgi->lport : hp->dest,
- par->in, true);
-
+ iph->saddr, iph->daddr,
+ hp->source, hp->dest,
+ par->in, NFT_LOOKUP_ESTABLISHED);
+
+ if (sk->sk_state == TCP_TIME_WAIT && hp->syn && !hp->rst && !hp->ack && !hp->fin) {
+ struct sock *sk2;
+
+ sk2 = nf_tproxy_get_sock_v4(dev_net(skb->dev), iph->protocol,
+ iph->saddr, tgi->laddr ? tgi->laddr : iph->daddr,
+ hp->source, tgi->lport ? tgi->lport : hp->dest,
+ par->in, NFT_LOOKUP_LISTENER);
+ if (sk2) {
+ inet_twsk_deschedule(inet_twsk(sk), &tcp_death_row);
+ inet_twsk_put(inet_twsk(sk));
+ sk = sk2;
+ }
+ }
+ else if (!sk) {
+ sk = nf_tproxy_get_sock_v4(dev_net(skb->dev), iph->protocol,
+ iph->saddr, tgi->laddr ? tgi->laddr : iph->daddr,
+ hp->source, tgi->lport ? tgi->lport : hp->dest,
+ par->in, NFT_LOOKUP_LISTENER);
+ }
/* NOTE: assign_sock consumes our sk reference */
if (sk && nf_tproxy_assign_sock(skb, sk)) {
/* This should be in a separate target, but we don't do multiple
@@ -142,7 +142,7 @@ socket_mt(const struct sk_buff *skb, const struct xt_match_param *par)
#endif
sk = nf_tproxy_get_sock_v4(dev_net(skb->dev), protocol,
- saddr, daddr, sport, dport, par->in, false);
+ saddr, daddr, sport, dport, par->in, NFT_LOOKUP_ANY);
if (sk != NULL) {
bool wildcard = (sk->sk_state != TCP_TIME_WAIT && inet_sk(sk)->rcv_saddr == 0);