diff options
| author |   Florin Coras <fcoras@cisco.com> | 2017-05-09 00:52:37 -0700 |
|---|---|---|
| committer |   Dave Barach <openvpp@barachs.net> | 2017-05-10 12:44:08 +0000 |
| commit | dc629cd95fde7601679354de4a1668070c2ac486 (patch) | |
| tree | 2ec9b665f69d540420fb189cba3b5b7519610cd3 /src/vnet/tcp/tcp_input.c | |
| parent | 4aa586fb94a3500b82b40be10ebb558e17232254 (diff) | |
Ignore data in RST segments, VPP-723
Change-Id: I01650b3b10b79ec549be0d5eceb0e318c06fcb50
Signed-off-by: Florin Coras <fcoras@cisco.com>
Diffstat (limited to 'src/vnet/tcp/tcp_input.c')
| -rw-r--r-- | src/vnet/tcp/tcp_input.c | 38 |
1 files changed, 23 insertions, 15 deletions
diff --git a/src/vnet/tcp/tcp_input.c b/src/vnet/tcp/tcp_input.c index ceb00fc3..82e676d4 100644 --- a/src/vnet/tcp/tcp_input.c +++ b/src/vnet/tcp/tcp_input.c @@ -2106,16 +2106,16 @@ tcp46_listen_inline (vlib_main_t * vm, vlib_node_runtime_t * node, /* Create child session. For syn-flood protection use filter */ - /* 1. first check for an RST */ - if (tcp_rst (th0)) - goto drop; + /* 1. first check for an RST: handled in dispatch */ + /* if (tcp_rst (th0)) + goto drop; */ - /* 2. second check for an ACK */ - if (tcp_ack (th0)) - { - tcp_send_reset (b0, is_ip4); - goto drop; - } + /* 2. second check for an ACK: handled in dispatch */ + /* if (tcp_ack (th0)) + { + tcp_send_reset (b0, is_ip4); + goto drop; + } */ /* 3. check for a SYN (did that already) */ @@ -2401,14 +2401,17 @@ tcp46_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node, next0 = tm->dispatch_table[tc0->state][flags0].next; error0 = tm->dispatch_table[tc0->state][flags0].error; - if (PREDICT_FALSE (error0 == TCP_ERROR_DISPATCH)) + if (PREDICT_FALSE (error0 == TCP_ERROR_DISPATCH + || next0 == TCP_INPUT_NEXT_RESET)) { - tcp_state_t state0 = tc0->state; /* Overload tcp flags to store state */ + tcp_state_t state0 = tc0->state; vnet_buffer (b0)->tcp.flags = tc0->state; - clib_warning ("disp error state %U flags %U", - format_tcp_state, &state0, - format_tcp_flags, (int) flags0); + + if (error0 == TCP_ERROR_DISPATCH) + clib_warning ("disp error state %U flags %U", + format_tcp_state, &state0, format_tcp_flags, + (int) flags0); } } else @@ -2517,6 +2520,8 @@ do { \ /* SYNs for new connections -> tcp-listen. */ _(LISTEN, TCP_FLAG_SYN, TCP_INPUT_NEXT_LISTEN, TCP_ERROR_NONE); + _(LISTEN, TCP_FLAG_ACK, TCP_INPUT_NEXT_RESET, TCP_ERROR_NONE); + _(LISTEN, TCP_FLAG_RST, TCP_INPUT_NEXT_DROP, TCP_ERROR_NONE); /* ACK for for a SYN-ACK -> tcp-rcv-process. */ _(SYN_RCVD, TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); _(SYN_RCVD, TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); @@ -2534,6 +2539,8 @@ do { \ _(ESTABLISHED, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE); _(ESTABLISHED, TCP_FLAG_RST, TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE); + _(ESTABLISHED, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_ESTABLISHED, + TCP_ERROR_NONE); /* ACK or FIN-ACK to our FIN */ _(FIN_WAIT_1, TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); _(FIN_WAIT_1, TCP_FLAG_ACK | TCP_FLAG_FIN, TCP_INPUT_NEXT_RCV_PROCESS, @@ -2546,7 +2553,8 @@ do { \ _(FIN_WAIT_2, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); _(LAST_ACK, TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); - _(CLOSED, TCP_FLAG_ACK, TCP_INPUT_NEXT_DROP, TCP_ERROR_CONNECTION_CLOSED); + _(CLOSED, TCP_FLAG_ACK, TCP_INPUT_NEXT_RESET, TCP_ERROR_CONNECTION_CLOSED); + _(CLOSED, TCP_FLAG_RST, TCP_INPUT_NEXT_DROP, TCP_ERROR_CONNECTION_CLOSED); #undef _ } |