diff options
Diffstat (limited to 'src/vnet/tcp/tcp_input.c')
| -rw-r--r-- | src/vnet/tcp/tcp_input.c | 27 |
1 files changed, 18 insertions, 9 deletions
diff --git a/src/vnet/tcp/tcp_input.c b/src/vnet/tcp/tcp_input.c index 4614772d008..d1736e9fb4e 100644 --- a/src/vnet/tcp/tcp_input.c +++ b/src/vnet/tcp/tcp_input.c @@ -121,10 +121,11 @@ tcp_segment_in_rcv_wnd (tcp_connection_t * tc, u32 seq, u32 end_seq) * * @param th TCP header * @param to TCP options data structure to be populated + * @param is_syn set if packet is syn * @return -1 if parsing failed */ -static int -tcp_options_parse (tcp_header_t * th, tcp_options_t * to) +static inline int +tcp_options_parse (tcp_header_t * th, tcp_options_t * to, u8 is_syn) { const u8 *data; u8 opt_len, opts_len, kind; @@ -136,7 +137,7 @@ tcp_options_parse (tcp_header_t * th, tcp_options_t * to) /* Zero out all flags but those set in SYN */ to->flags &= (TCP_OPTS_FLAG_SACK_PERMITTED | TCP_OPTS_FLAG_WSCALE - | TCP_OPTS_FLAG_SACK); + | TCP_OPTS_FLAG_TSTAMP | TCP_OPTION_MSS); for (; opts_len > 0; opts_len -= opt_len, data += opt_len) { @@ -166,6 +167,8 @@ tcp_options_parse (tcp_header_t * th, tcp_options_t * to) switch (kind) { case TCP_OPTION_MSS: + if (!is_syn) + break; if ((opt_len == TCP_OPTION_LEN_MSS) && tcp_syn (th)) { to->flags |= TCP_OPTS_FLAG_MSS; @@ -173,6 +176,8 @@ tcp_options_parse (tcp_header_t * th, tcp_options_t * to) } break; case TCP_OPTION_WINDOW_SCALE: + if (!is_syn) + break; if ((opt_len == TCP_OPTION_LEN_WINDOW_SCALE) && tcp_syn (th)) { to->flags |= TCP_OPTS_FLAG_WSCALE; @@ -186,14 +191,18 @@ tcp_options_parse (tcp_header_t * th, tcp_options_t * to) } break; case TCP_OPTION_TIMESTAMP: - if (opt_len == TCP_OPTION_LEN_TIMESTAMP) + if (is_syn) + to->flags |= TCP_OPTS_FLAG_TSTAMP; + if ((to->flags & TCP_OPTS_FLAG_TSTAMP) + && opt_len == TCP_OPTION_LEN_TIMESTAMP) { - to->flags |= TCP_OPTS_FLAG_TSTAMP; to->tsval = clib_net_to_host_u32 (*(u32 *) (data + 2)); to->tsecr = clib_net_to_host_u32 (*(u32 *) (data + 6)); } break; case TCP_OPTION_SACK_PERMITTED: + if (!is_syn) + break; if (opt_len == TCP_OPTION_LEN_SACK_PERMITTED && tcp_syn (th)) to->flags |= TCP_OPTS_FLAG_SACK_PERMITTED; break; @@ -289,9 +298,8 @@ tcp_segment_validate (tcp_worker_ctx_t * wrk, tcp_connection_t * tc0, goto error; } - if (PREDICT_FALSE (tcp_options_parse (th0, &tc0->rcv_opts))) + if (PREDICT_FALSE (tcp_options_parse (th0, &tc0->rcv_opts, 0))) { - clib_warning ("options parse error"); *error0 = TCP_ERROR_OPTIONS; goto error; } @@ -361,6 +369,7 @@ tcp_segment_validate (tcp_worker_ctx_t * wrk, tcp_connection_t * tc0, /* TODO implement RFC 5961 */ if (tc0->state == TCP_STATE_SYN_RCVD) { + tcp_options_parse (th0, &tc0->rcv_opts, 1); tcp_send_synack (tc0); TCP_EVT_DBG (TCP_EVT_SYN_RCVD, tc0, 0); } @@ -2434,7 +2443,7 @@ tcp46_syn_sent_inline (vlib_main_t * vm, vlib_node_runtime_t * node, } /* Parse options */ - if (tcp_options_parse (tcp0, &tc0->rcv_opts)) + if (tcp_options_parse (tcp0, &tc0->rcv_opts, 1)) { clib_warning ("options parse fail"); error0 = TCP_ERROR_OPTIONS; @@ -3093,7 +3102,7 @@ tcp46_listen_inline (vlib_main_t * vm, vlib_node_runtime_t * node, sizeof (ip6_address_t)); } - if (tcp_options_parse (th0, &child0->rcv_opts)) + if (tcp_options_parse (th0, &child0->rcv_opts, 1)) { clib_warning ("options parse fail"); goto drop; |