diff options
| author |   Matus Fabian <matfabia@cisco.com> | 2018-05-04 03:57:42 -0700 |
|---|---|---|
| committer |   Damjan Marion <dmarion.lists@gmail.com> | 2018-05-08 16:03:30 +0000 |
| commit | ebdf190a9c4a514329de7e5e9b9178c3af055122 (patch) | |
| tree | 3b6d8fdd1e4cf2c3fc8d1bb0202308334d1223ee /src/plugins/nat/nat.h | |
| parent | 7220f42cbed7ccde0738e74fd498db1770b24cb7 (diff) | |
NAT44: TCP connection close detection (VPP-1266)
Change-Id: Iba1cc1179ee80478e29888790a6476571d1904dc
Signed-off-by: Matus Fabian <matfabia@cisco.com>
Diffstat (limited to 'src/plugins/nat/nat.h')
| -rw-r--r-- | src/plugins/nat/nat.h | 30 |
1 files changed, 28 insertions, 2 deletions
diff --git a/src/plugins/nat/nat.h b/src/plugins/nat/nat.h index 775376fcbab..61d26b2076c 100644 --- a/src/plugins/nat/nat.h +++ b/src/plugins/nat/nat.h @@ -115,8 +115,10 @@ typedef enum { _(3, TCP_ESTABLISHED, "tcp-established") \ _(4, TCP_FIN_WAIT, "tcp-fin-wait") \ _(5, TCP_CLOSE_WAIT, "tcp-close-wait") \ - _(6, TCP_LAST_ACK, "tcp-last-ack") \ - _(7, ICMP_ACTIVE, "icmp-active") + _(6, TCP_CLOSING, "tcp-closing") \ + _(7, TCP_LAST_ACK, "tcp-last-ack") \ + _(8, TCP_CLOSED, "tcp-closed") \ + _(9, ICMP_ACTIVE, "icmp-active") typedef enum { #define _(v, N, s) SNAT_SESSION_##N = v, @@ -164,6 +166,9 @@ typedef CLIB_PACKED(struct { /* External hos address and port after translation */ ip4_address_t ext_host_nat_addr; /* 74-77 */ u16 ext_host_nat_port; /* 78-79 */ + + /* TCP session state */ + u8 state; }) snat_session_t; @@ -681,4 +686,25 @@ user_session_increment(snat_main_t *sm, snat_user_t *u, u8 is_static) } } +always_inline void +nat44_set_tcp_session_state(snat_main_t * sm, snat_session_t * ses, + tcp_header_t * tcp, u32 thread_index) +{ + if (tcp->flags & TCP_FLAG_FIN && ses->state == SNAT_SESSION_UNKNOWN) + ses->state = SNAT_SESSION_TCP_FIN_WAIT; + else if (tcp->flags & TCP_FLAG_FIN && ses->state == SNAT_SESSION_TCP_FIN_WAIT) + ses->state = SNAT_SESSION_TCP_CLOSING; + else if (tcp->flags & TCP_FLAG_ACK && ses->state == SNAT_SESSION_TCP_FIN_WAIT) + ses->state = SNAT_SESSION_TCP_CLOSE_WAIT; + else if (tcp->flags & TCP_FLAG_FIN && ses->state == SNAT_SESSION_TCP_CLOSE_WAIT) + ses->state = SNAT_SESSION_TCP_LAST_ACK; + else if (tcp->flags & TCP_FLAG_ACK && ses->state == SNAT_SESSION_TCP_CLOSING) + ses->state = SNAT_SESSION_TCP_LAST_ACK; + else if (tcp->flags & TCP_FLAG_ACK && ses->state == SNAT_SESSION_TCP_LAST_ACK) + { + nat_free_session_data (sm, ses, thread_index); + ses->state = SNAT_SESSION_TCP_CLOSED; + } +} + #endif /* __included_snat_h__ */ |