diff options
Diffstat (limited to 'include/linux/netfilter/nf_conntrack_tcp.h')
-rw-r--r-- | include/linux/netfilter/nf_conntrack_tcp.h | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/include/linux/netfilter/nf_conntrack_tcp.h b/include/linux/netfilter/nf_conntrack_tcp.h new file mode 100644 index 0000000..b2feeff --- /dev/null +++ b/include/linux/netfilter/nf_conntrack_tcp.h @@ -0,0 +1,56 @@ +#ifndef _NF_CONNTRACK_TCP_H +#define _NF_CONNTRACK_TCP_H +/* TCP tracking. */ + +/* This is exposed to userspace (ctnetlink) */ +enum tcp_conntrack { + TCP_CONNTRACK_NONE, + TCP_CONNTRACK_SYN_SENT, + TCP_CONNTRACK_SYN_RECV, + TCP_CONNTRACK_ESTABLISHED, + TCP_CONNTRACK_FIN_WAIT, + TCP_CONNTRACK_CLOSE_WAIT, + TCP_CONNTRACK_LAST_ACK, + TCP_CONNTRACK_TIME_WAIT, + TCP_CONNTRACK_CLOSE, + TCP_CONNTRACK_LISTEN, + TCP_CONNTRACK_MAX, + TCP_CONNTRACK_IGNORE +}; + +/* Window scaling is advertised by the sender */ +#define IP_CT_TCP_FLAG_WINDOW_SCALE 0x01 + +/* SACK is permitted by the sender */ +#define IP_CT_TCP_FLAG_SACK_PERM 0x02 + +/* This sender sent FIN first */ +#define IP_CT_TCP_FLAG_CLOSE_INIT 0x03 + +#ifdef __KERNEL__ + +struct ip_ct_tcp_state { + u_int32_t td_end; /* max of seq + len */ + u_int32_t td_maxend; /* max of ack + max(win, 1) */ + u_int32_t td_maxwin; /* max(win) */ + u_int8_t td_scale; /* window scale factor */ + u_int8_t loose; /* used when connection picked up from the middle */ + u_int8_t flags; /* per direction options */ +}; + +struct ip_ct_tcp +{ + struct ip_ct_tcp_state seen[2]; /* connection parameters per direction */ + u_int8_t state; /* state of the connection (enum tcp_conntrack) */ + /* For detecting stale connections */ + u_int8_t last_dir; /* Direction of the last packet (enum ip_conntrack_dir) */ + u_int8_t retrans; /* Number of retransmitted packets */ + u_int8_t last_index; /* Index of the last packet */ + u_int32_t last_seq; /* Last sequence number seen in dir */ + u_int32_t last_ack; /* Last sequence number seen in opposite dir */ + u_int32_t last_end; /* Last seq + len */ +}; + +#endif /* __KERNEL__ */ + +#endif /* _NF_CONNTRACK_TCP_H */ |