Merge master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6

[pandora-kernel.git] / net / ipv4 / netfilter / ip_conntrack_proto_tcp.c

diff --git a/net/ipv4/netfilter/ip_conntrack_proto_tcp.c b/net/ipv4/netfilter/ip_conntrack_proto_tcp.c
index 6259816..e0dc370 100644 (file)
--- a/net/ipv4/netfilter/ip_conntrack_proto_tcp.c
+++ b/net/ipv4/netfilter/ip_conntrack_proto_tcp.c
@@ -32,7 +32,6 @@
 
 #include <net/tcp.h>
 
-#include <linux/netfilter.h>
 #include <linux/netfilter_ipv4.h>
 #include <linux/netfilter_ipv4/ip_conntrack.h>
 #include <linux/netfilter_ipv4/ip_conntrack_protocol.h>
@@ -85,21 +84,21 @@ static const char *tcp_conntrack_names[] = {
 #define HOURS * 60 MINS
 #define DAYS * 24 HOURS
 
-unsigned long ip_ct_tcp_timeout_syn_sent =      2 MINS;
-unsigned long ip_ct_tcp_timeout_syn_recv =     60 SECS;
-unsigned long ip_ct_tcp_timeout_established =   5 DAYS;
-unsigned long ip_ct_tcp_timeout_fin_wait =      2 MINS;
-unsigned long ip_ct_tcp_timeout_close_wait =   60 SECS;
-unsigned long ip_ct_tcp_timeout_last_ack =     30 SECS;
-unsigned long ip_ct_tcp_timeout_time_wait =     2 MINS;
-unsigned long ip_ct_tcp_timeout_close =        10 SECS;
+unsigned int ip_ct_tcp_timeout_syn_sent =      2 MINS;
+unsigned int ip_ct_tcp_timeout_syn_recv =     60 SECS;
+unsigned int ip_ct_tcp_timeout_established =   5 DAYS;
+unsigned int ip_ct_tcp_timeout_fin_wait =      2 MINS;
+unsigned int ip_ct_tcp_timeout_close_wait =   60 SECS;
+unsigned int ip_ct_tcp_timeout_last_ack =     30 SECS;
+unsigned int ip_ct_tcp_timeout_time_wait =     2 MINS;
+unsigned int ip_ct_tcp_timeout_close =        10 SECS;
 
 /* RFC1122 says the R2 limit should be at least 100 seconds.
    Linux uses 15 packets as limit, which corresponds 
    to ~13-30min depending on RTO. */
-unsigned long ip_ct_tcp_timeout_max_retrans =     5 MINS;
+unsigned int ip_ct_tcp_timeout_max_retrans =     5 MINS;
  
-static const unsigned long * tcp_timeouts[]
+static const unsigned int * tcp_timeouts[]
 = { NULL,                              /*      TCP_CONNTRACK_NONE */
     &ip_ct_tcp_timeout_syn_sent,       /*      TCP_CONNTRACK_SYN_SENT, */
     &ip_ct_tcp_timeout_syn_recv,       /*      TCP_CONNTRACK_SYN_RECV, */
@@ -272,9 +271,9 @@ static const enum tcp_conntrack tcp_conntracks[2][6][TCP_CONNTRACK_MAX] = {
  *     sCL -> sCL
  */
 /*          sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI   */
-/*ack*/           { sIV, sIV, sSR, sES, sCW, sCW, sTW, sTW, sCL, sIV },
+/*ack*/           { sIV, sIG, sSR, sES, sCW, sCW, sTW, sTW, sCL, sIV },
 /*
- *     sSS -> sIV      Might be a half-open connection.
+ *     sSS -> sIG      Might be a half-open connection.
  *     sSR -> sSR      Might answer late resent SYN.
  *     sES -> sES      :-)
  *     sFW -> sCW      Normal close request answered by ACK.
@@ -341,9 +340,10 @@ static int tcp_print_conntrack(struct seq_file *s,
 static int tcp_to_nfattr(struct sk_buff *skb, struct nfattr *nfa,
                         const struct ip_conntrack *ct)
 {
-       struct nfattr *nest_parms = NFA_NEST(skb, CTA_PROTOINFO_TCP);
+       struct nfattr *nest_parms;
        
        read_lock_bh(&tcp_lock);
+       nest_parms = NFA_NEST(skb, CTA_PROTOINFO_TCP);
        NFA_PUT(skb, CTA_PROTOINFO_TCP_STATE, sizeof(u_int8_t),
                &ct->proto.tcp.state);
        read_unlock_bh(&tcp_lock);
@@ -917,8 +917,12 @@ static int tcp_packet(struct ip_conntrack *conntrack,
 
        switch (new_state) {
        case TCP_CONNTRACK_IGNORE:
-               /* Either SYN in ORIGINAL
-                * or SYN/ACK in REPLY. */
+               /* Ignored packets:
+                * 
+                * a) SYN in ORIGINAL
+                * b) SYN/ACK in REPLY
+                * c) ACK in reply direction after initial SYN in original.
+                */
                if (index == TCP_SYNACK_SET
                    && conntrack->proto.tcp.last_index == TCP_SYN_SET
                    && conntrack->proto.tcp.last_dir != dir
@@ -985,16 +989,23 @@ static int tcp_packet(struct ip_conntrack *conntrack,
                }
        case TCP_CONNTRACK_CLOSE:
                if (index == TCP_RST_SET
-                   && test_bit(IPS_SEEN_REPLY_BIT, &conntrack->status)
-                   && conntrack->proto.tcp.last_index == TCP_SYN_SET
+                   && ((test_bit(IPS_SEEN_REPLY_BIT, &conntrack->status)
+                        && conntrack->proto.tcp.last_index == TCP_SYN_SET)
+                       || (!test_bit(IPS_ASSURED_BIT, &conntrack->status)
+                           && conntrack->proto.tcp.last_index == TCP_ACK_SET))
                    && ntohl(th->ack_seq) == conntrack->proto.tcp.last_end) {
-                       /* RST sent to invalid SYN we had let trough
-                        * SYN was in window then, tear down connection.
+                       /* RST sent to invalid SYN or ACK we had let through
+                        * at a) and c) above:
+                        *
+                        * a) SYN was in window then
+                        * c) we hold a half-open connection.
+                        *
+                        * Delete our connection entry.
                         * We skip window checking, because packet might ACK
-                        * segments we ignored in the SYN. */
+                        * segments we ignored. */
                        goto in_window;
                }
-               /* Just fall trough */
+               /* Just fall through */
        default:
                /* Keep compilers happy. */
                break;