| /* |
| * Copyright (c) 2016 Cisco and/or its affiliates. |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at: |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #ifndef _vnet_tcp_h_ |
| #define _vnet_tcp_h_ |
| |
| #include <vnet/vnet.h> |
| #include <vnet/ip/ip.h> |
| #include <vnet/tcp/tcp_packet.h> |
| #include <vnet/tcp/tcp_timer.h> |
| #include <vnet/session/transport.h> |
| #include <vnet/session/session.h> |
| |
| #define TCP_TICK 10e-3 /**< TCP tick period (s) */ |
| #define THZ 1/TCP_TICK /**< TCP tick frequency */ |
| #define TCP_TSTAMP_RESOLUTION TCP_TICK /**< Time stamp resolution */ |
| #define TCP_PAWS_IDLE 24 * 24 * 60 * 60 * THZ /**< 24 days */ |
| #define TCP_MAX_OPTION_SPACE 40 |
| |
| #define TCP_DUPACK_THRESHOLD 3 |
| #define TCP_MAX_RX_FIFO_SIZE 2 << 20 |
| #define TCP_IW_N_SEGMENTS 10 |
| |
| /** TCP FSM state definitions as per RFC793. */ |
| #define foreach_tcp_fsm_state \ |
| _(CLOSED, "CLOSED") \ |
| _(LISTEN, "LISTEN") \ |
| _(SYN_SENT, "SYN_SENT") \ |
| _(SYN_RCVD, "SYN_RCVD") \ |
| _(ESTABLISHED, "ESTABLISHED") \ |
| _(CLOSE_WAIT, "CLOSE_WAIT") \ |
| _(FIN_WAIT_1, "FIN_WAIT_1") \ |
| _(LAST_ACK, "LAST_ACK") \ |
| _(CLOSING, "CLOSING") \ |
| _(FIN_WAIT_2, "FIN_WAIT_2") \ |
| _(TIME_WAIT, "TIME_WAIT") |
| |
| typedef enum _tcp_state |
| { |
| #define _(sym, str) TCP_STATE_##sym, |
| foreach_tcp_fsm_state |
| #undef _ |
| TCP_N_STATES |
| } tcp_state_t; |
| |
| format_function_t format_tcp_state; |
| |
| /** TCP timers */ |
| #define foreach_tcp_timer \ |
| _(RETRANSMIT, "RETRANSMIT") \ |
| _(DELACK, "DELAYED ACK") \ |
| _(PERSIST, "PERSIST") \ |
| _(KEEP, "KEEP") \ |
| _(2MSL, "2MSL") \ |
| _(RETRANSMIT_SYN, "RETRANSMIT_SYN") \ |
| _(ESTABLISH, "ESTABLISH") |
| |
| typedef enum _tcp_timers |
| { |
| #define _(sym, str) TCP_TIMER_##sym, |
| foreach_tcp_timer |
| #undef _ |
| TCP_N_TIMERS |
| } tcp_timers_e; |
| |
| typedef void (timer_expiration_handler) (u32 index); |
| |
| extern timer_expiration_handler tcp_timer_delack_handler; |
| extern timer_expiration_handler tcp_timer_retransmit_handler; |
| extern timer_expiration_handler tcp_timer_retransmit_syn_handler; |
| |
| #define TCP_TIMER_HANDLE_INVALID ((u32) ~0) |
| |
| /* Timer delays as multiples of 100ms */ |
| #define TCP_TO_TIMER_TICK TCP_TICK*10 /* Period for converting from TCP |
| * ticks to timer units */ |
| #define TCP_DELACK_TIME 1 /* 0.1s */ |
| #define TCP_ESTABLISH_TIME 750 /* 75s */ |
| #define TCP_2MSL_TIME 300 /* 30s */ |
| |
| #define TCP_RTO_MAX 60 * THZ /* Min max RTO (60s) as per RFC6298 */ |
| #define TCP_RTT_MAX 30 * THZ /* 30s (probably too much) */ |
| #define TCP_RTO_SYN_RETRIES 3 /* SYN retries without doubling RTO */ |
| #define TCP_RTO_INIT 1 * THZ /* Initial retransmit timer */ |
| |
| void tcp_update_time (f64 now, u32 thread_index); |
| |
| /** TCP connection flags */ |
| #define foreach_tcp_connection_flag \ |
| _(DELACK, "Delay ACK") \ |
| _(SNDACK, "Send ACK") \ |
| _(BURSTACK, "Burst ACK set") \ |
| _(SENT_RCV_WND0, "Sent 0 receive window") \ |
| _(RECOVERY, "Recovery on") \ |
| _(FAST_RECOVERY, "Fast Recovery on") |
| |
| typedef enum _tcp_connection_flag_bits |
| { |
| #define _(sym, str) TCP_CONN_##sym##_BIT, |
| foreach_tcp_connection_flag |
| #undef _ |
| TCP_CONN_N_FLAG_BITS |
| } tcp_connection_flag_bits_e; |
| |
| typedef enum _tcp_connection_flag |
| { |
| #define _(sym, str) TCP_CONN_##sym = 1 << TCP_CONN_##sym##_BIT, |
| foreach_tcp_connection_flag |
| #undef _ |
| TCP_CONN_N_FLAGS |
| } tcp_connection_flags_e; |
| |
| /** TCP buffer flags */ |
| #define foreach_tcp_buf_flag \ |
| _ (ACK) /**< Sending ACK. */ \ |
| _ (DUPACK) /**< Sending DUPACK. */ \ |
| |
| enum |
| { |
| #define _(f) TCP_BUF_BIT_##f, |
| foreach_tcp_buf_flag |
| #undef _ |
| TCP_N_BUF_BITS, |
| }; |
| |
| enum |
| { |
| #define _(f) TCP_BUF_FLAG_##f = 1 << TCP_BUF_BIT_##f, |
| foreach_tcp_buf_flag |
| #undef _ |
| }; |
| |
| #define TCP_MAX_SACK_BLOCKS 5 /**< Max number of SACK blocks stored */ |
| #define TCP_INVALID_SACK_HOLE_INDEX ((u32)~0) |
| |
| typedef struct _sack_scoreboard_hole |
| { |
| u32 next; /**< Index for next entry in linked list */ |
| u32 prev; /**< Index for previous entry in linked list */ |
| u32 start; /**< Start sequence number */ |
| u32 end; /**< End sequence number */ |
| } sack_scoreboard_hole_t; |
| |
| typedef struct _sack_scoreboard |
| { |
| sack_scoreboard_hole_t *holes; /**< Pool of holes */ |
| u32 head; /**< Index to first entry */ |
| u32 sacked_bytes; /**< Number of bytes sacked in sb */ |
| } sack_scoreboard_t; |
| |
| typedef enum _tcp_cc_algorithm_type |
| { |
| TCP_CC_NEWRENO, |
| } tcp_cc_algorithm_type_e; |
| |
| typedef struct _tcp_cc_algorithm tcp_cc_algorithm_t; |
| |
| typedef enum _tcp_cc_ack_t |
| { |
| TCP_CC_ACK, |
| TCP_CC_DUPACK, |
| TCP_CC_PARTIALACK |
| } tcp_cc_ack_t; |
| |
| typedef struct _tcp_connection |
| { |
| transport_connection_t connection; /**< Common transport data. First! */ |
| |
| u8 state; /**< TCP state as per tcp_state_t */ |
| u16 flags; /**< Connection flags (see tcp_conn_flags_e) */ |
| u32 timers[TCP_N_TIMERS]; /**< Timer handles into timer wheel */ |
| |
| /* TODO RFC4898 */ |
| |
| /** Send sequence variables RFC793 */ |
| u32 snd_una; /**< oldest unacknowledged sequence number */ |
| u32 snd_una_max; /**< newest unacknowledged sequence number + 1*/ |
| u32 snd_wnd; /**< send window */ |
| u32 snd_wl1; /**< seq number used for last snd.wnd update */ |
| u32 snd_wl2; /**< ack number used for last snd.wnd update */ |
| u32 snd_nxt; /**< next seq number to be sent */ |
| |
| /** Receive sequence variables RFC793 */ |
| u32 rcv_nxt; /**< next sequence number expected */ |
| u32 rcv_wnd; /**< receive window we expect */ |
| |
| u32 rcv_las; /**< rcv_nxt at last ack sent/rcv_wnd update */ |
| u32 iss; /**< initial sent sequence */ |
| u32 irs; /**< initial remote sequence */ |
| |
| /* Options */ |
| tcp_options_t opt; /**< TCP connection options parsed */ |
| u8 rcv_wscale; /**< Window scale to advertise to peer */ |
| u8 snd_wscale; /**< Window scale to use when sending */ |
| u32 tsval_recent; /**< Last timestamp received */ |
| u32 tsval_recent_age; /**< When last updated tstamp_recent*/ |
| |
| sack_block_t *snd_sacks; /**< Vector of SACKs to send. XXX Fixed size? */ |
| sack_scoreboard_t sack_sb; /**< SACK "scoreboard" that tracks holes */ |
| |
| u8 rcv_dupacks; /**< Number of DUPACKs received */ |
| u8 snt_dupacks; /**< Number of DUPACKs sent in a burst */ |
| |
| /* Congestion control */ |
| u32 cwnd; /**< Congestion window */ |
| u32 ssthresh; /**< Slow-start threshold */ |
| u32 prev_ssthresh; /**< ssthresh before congestion */ |
| u32 bytes_acked; /**< Bytes acknowledged by current segment */ |
| u32 rtx_bytes; /**< Retransmitted bytes */ |
| u32 tsecr_last_ack; /**< Timestamp echoed to us in last health ACK */ |
| tcp_cc_algorithm_t *cc_algo; /**< Congestion control algorithm */ |
| |
| /* RTT and RTO */ |
| u32 rto; /**< Retransmission timeout */ |
| u32 rto_boff; /**< Index for RTO backoff */ |
| u32 srtt; /**< Smoothed RTT */ |
| u32 rttvar; /**< Smoothed mean RTT difference. Approximates variance */ |
| u32 rtt_ts; /**< Timestamp for tracked ACK */ |
| u32 rtt_seq; /**< Sequence number for tracked ACK */ |
| |
| u16 snd_mss; /**< Send MSS */ |
| } tcp_connection_t; |
| |
| struct _tcp_cc_algorithm |
| { |
| void (*rcv_ack) (tcp_connection_t * tc); |
| void (*rcv_cong_ack) (tcp_connection_t * tc, tcp_cc_ack_t ack); |
| void (*congestion) (tcp_connection_t * tc); |
| void (*recovered) (tcp_connection_t * tc); |
| void (*init) (tcp_connection_t * tc); |
| }; |
| |
| #define tcp_fastrecovery_on(tc) (tc)->flags |= TCP_CONN_FAST_RECOVERY |
| #define tcp_fastrecovery_off(tc) (tc)->flags &= ~TCP_CONN_FAST_RECOVERY |
| #define tcp_in_fastrecovery(tc) ((tc)->flags & TCP_CONN_FAST_RECOVERY) |
| #define tcp_in_recovery(tc) ((tc)->flags & (TCP_CONN_FAST_RECOVERY | TCP_CONN_RECOVERY)) |
| #define tcp_recovery_off(tc) ((tc)->flags &= ~(TCP_CONN_FAST_RECOVERY | TCP_CONN_RECOVERY)) |
| #define tcp_in_slowstart(tc) (tc->cwnd < tc->ssthresh) |
| |
| typedef enum |
| { |
| TCP_IP4, |
| TCP_IP6, |
| TCP_N_AF, |
| } tcp_af_t; |
| |
| typedef enum _tcp_error |
| { |
| #define tcp_error(n,s) TCP_ERROR_##n, |
| #include <vnet/tcp/tcp_error.def> |
| #undef tcp_error |
| TCP_N_ERROR, |
| } tcp_error_t; |
| |
| typedef struct _tcp_lookup_dispatch |
| { |
| u8 next, error; |
| } tcp_lookup_dispatch_t; |
| |
| typedef struct _tcp_main |
| { |
| /* Per-worker thread tcp connection pools */ |
| tcp_connection_t **connections; |
| |
| /* Pool of listeners. */ |
| tcp_connection_t *listener_pool; |
| |
| /** Dispatch table by state and flags */ |
| tcp_lookup_dispatch_t dispatch_table[TCP_N_STATES][64]; |
| |
| u8 log2_tstamp_clocks_per_tick; |
| f64 tstamp_ticks_per_clock; |
| |
| /** per-worker tx buffer free lists */ |
| u32 **tx_buffers; |
| |
| /* Per worker-thread timer wheel for connections timers */ |
| tw_timer_wheel_16t_2w_512sl_t *timer_wheels; |
| |
| /* Convenience per worker-thread vector of connections to DELACK */ |
| u32 **delack_connections; |
| |
| /* Pool of half-open connections on which we've sent a SYN */ |
| tcp_connection_t *half_open_connections; |
| |
| /* Pool of local TCP endpoints */ |
| transport_endpoint_t *local_endpoints; |
| |
| /* Local endpoints lookup table */ |
| transport_endpoint_table_t local_endpoints_table; |
| |
| /* Congestion control algorithms registered */ |
| tcp_cc_algorithm_t *cc_algos; |
| |
| /* convenience */ |
| vlib_main_t *vlib_main; |
| vnet_main_t *vnet_main; |
| ip4_main_t *ip4_main; |
| ip6_main_t *ip6_main; |
| } tcp_main_t; |
| |
| extern tcp_main_t tcp_main; |
| extern vlib_node_registration_t tcp4_input_node; |
| extern vlib_node_registration_t tcp6_input_node; |
| extern vlib_node_registration_t tcp4_output_node; |
| extern vlib_node_registration_t tcp6_output_node; |
| |
| always_inline tcp_main_t * |
| vnet_get_tcp_main () |
| { |
| return &tcp_main; |
| } |
| |
| always_inline tcp_connection_t * |
| tcp_connection_get (u32 conn_index, u32 thread_index) |
| { |
| return pool_elt_at_index (tcp_main.connections[thread_index], conn_index); |
| } |
| |
| always_inline tcp_connection_t * |
| tcp_connection_get_if_valid (u32 conn_index, u32 thread_index) |
| { |
| if (tcp_main.connections[thread_index] == 0) |
| return 0; |
| if (pool_is_free_index (tcp_main.connections[thread_index], conn_index)) |
| return 0; |
| return pool_elt_at_index (tcp_main.connections[thread_index], conn_index); |
| } |
| |
| void tcp_connection_close (tcp_connection_t * tc); |
| void tcp_connection_cleanup (tcp_connection_t * tc); |
| void tcp_connection_del (tcp_connection_t * tc); |
| |
| always_inline tcp_connection_t * |
| tcp_listener_get (u32 tli) |
| { |
| return pool_elt_at_index (tcp_main.listener_pool, tli); |
| } |
| |
| always_inline tcp_connection_t * |
| tcp_half_open_connection_get (u32 conn_index) |
| { |
| return pool_elt_at_index (tcp_main.half_open_connections, conn_index); |
| } |
| |
| void tcp_make_ack (tcp_connection_t * ts, vlib_buffer_t * b); |
| void tcp_make_finack (tcp_connection_t * tc, vlib_buffer_t * b); |
| void tcp_make_synack (tcp_connection_t * ts, vlib_buffer_t * b); |
| void tcp_send_reset (vlib_buffer_t * pkt, u8 is_ip4); |
| void tcp_send_syn (tcp_connection_t * tc); |
| void tcp_send_fin (tcp_connection_t * tc); |
| void tcp_set_snd_mss (tcp_connection_t * tc); |
| |
| always_inline u32 |
| tcp_end_seq (tcp_header_t * th, u32 len) |
| { |
| return th->seq_number + tcp_is_syn (th) + tcp_is_fin (th) + len; |
| } |
| |
| /* Modulo arithmetic for TCP sequence numbers */ |
| #define seq_lt(_s1, _s2) ((i32)((_s1)-(_s2)) < 0) |
| #define seq_leq(_s1, _s2) ((i32)((_s1)-(_s2)) <= 0) |
| #define seq_gt(_s1, _s2) ((i32)((_s1)-(_s2)) > 0) |
| #define seq_geq(_s1, _s2) ((i32)((_s1)-(_s2)) >= 0) |
| |
| /* Modulo arithmetic for timestamps */ |
| #define timestamp_lt(_t1, _t2) ((i32)((_t1)-(_t2)) < 0) |
| #define timestamp_leq(_t1, _t2) ((i32)((_t1)-(_t2)) <= 0) |
| |
| always_inline u32 |
| tcp_flight_size (const tcp_connection_t * tc) |
| { |
| return tc->snd_una_max - tc->snd_una - tc->sack_sb.sacked_bytes |
| + tc->rtx_bytes; |
| } |
| |
| /** |
| * Initial cwnd as per RFC5681 |
| */ |
| always_inline u32 |
| tcp_initial_cwnd (const tcp_connection_t * tc) |
| { |
| if (tc->snd_mss > 2190) |
| return 2 * tc->snd_mss; |
| else if (tc->snd_mss > 1095) |
| return 3 * tc->snd_mss; |
| else |
| return 4 * tc->snd_mss; |
| } |
| |
| always_inline u32 |
| tcp_loss_wnd (const tcp_connection_t * tc) |
| { |
| return tc->snd_mss; |
| } |
| |
| always_inline u32 |
| tcp_available_wnd (const tcp_connection_t * tc) |
| { |
| return clib_min (tc->cwnd, tc->snd_wnd); |
| } |
| |
| always_inline u32 |
| tcp_available_snd_space (const tcp_connection_t * tc) |
| { |
| u32 available_wnd = tcp_available_wnd (tc); |
| u32 flight_size = tcp_flight_size (tc); |
| |
| if (available_wnd <= flight_size) |
| return 0; |
| |
| return available_wnd - flight_size; |
| } |
| |
| void tcp_retransmit_first_unacked (tcp_connection_t * tc); |
| |
| void tcp_fast_retransmit (tcp_connection_t * tc); |
| |
| always_inline u32 |
| tcp_time_now (void) |
| { |
| return clib_cpu_time_now () * tcp_main.tstamp_ticks_per_clock; |
| } |
| |
| u32 tcp_push_header (transport_connection_t * tconn, vlib_buffer_t * b); |
| |
| u32 |
| tcp_prepare_retransmit_segment (tcp_connection_t * tc, vlib_buffer_t * b, |
| u32 max_bytes); |
| |
| void tcp_connection_timers_init (tcp_connection_t * tc); |
| void tcp_connection_timers_reset (tcp_connection_t * tc); |
| |
| void tcp_connection_init_vars (tcp_connection_t * tc); |
| |
| always_inline void |
| tcp_connection_force_ack (tcp_connection_t * tc, vlib_buffer_t * b) |
| { |
| /* Reset flags, make sure ack is sent */ |
| tc->flags = TCP_CONN_SNDACK; |
| vnet_buffer (b)->tcp.flags &= ~TCP_BUF_FLAG_DUPACK; |
| } |
| |
| always_inline void |
| tcp_timer_set (tcp_connection_t * tc, u8 timer_id, u32 interval) |
| { |
| tc->timers[timer_id] |
| = tw_timer_start_16t_2w_512sl (&tcp_main.timer_wheels[tc->c_thread_index], |
| tc->c_c_index, timer_id, interval); |
| } |
| |
| always_inline void |
| tcp_retransmit_timer_set (tcp_main_t * tm, tcp_connection_t * tc) |
| { |
| /* XXX Switch to faster TW */ |
| tcp_timer_set (tc, TCP_TIMER_RETRANSMIT, |
| clib_max (tc->rto * TCP_TO_TIMER_TICK, 1)); |
| } |
| |
| always_inline void |
| tcp_timer_reset (tcp_connection_t * tc, u8 timer_id) |
| { |
| if (tc->timers[timer_id] == TCP_TIMER_HANDLE_INVALID) |
| return; |
| |
| tw_timer_stop_16t_2w_512sl (&tcp_main.timer_wheels[tc->c_thread_index], |
| tc->timers[timer_id]); |
| tc->timers[timer_id] = TCP_TIMER_HANDLE_INVALID; |
| } |
| |
| always_inline void |
| tcp_timer_update (tcp_connection_t * tc, u8 timer_id, u32 interval) |
| { |
| if (tc->timers[timer_id] != TCP_TIMER_HANDLE_INVALID) |
| tw_timer_stop_16t_2w_512sl (&tcp_main.timer_wheels[tc->c_thread_index], |
| tc->timers[timer_id]); |
| tc->timers[timer_id] = |
| tw_timer_start_16t_2w_512sl (&tcp_main.timer_wheels[tc->c_thread_index], |
| tc->c_c_index, timer_id, interval); |
| } |
| |
| always_inline u8 |
| tcp_timer_is_active (tcp_connection_t * tc, tcp_timers_e timer) |
| { |
| return tc->timers[timer] != TCP_TIMER_HANDLE_INVALID; |
| } |
| |
| void |
| scoreboard_remove_hole (sack_scoreboard_t * sb, |
| sack_scoreboard_hole_t * hole); |
| |
| always_inline sack_scoreboard_hole_t * |
| scoreboard_next_hole (sack_scoreboard_t * sb, sack_scoreboard_hole_t * hole) |
| { |
| if (hole->next != TCP_INVALID_SACK_HOLE_INDEX) |
| return pool_elt_at_index (sb->holes, hole->next); |
| return 0; |
| } |
| |
| always_inline sack_scoreboard_hole_t * |
| scoreboard_first_hole (sack_scoreboard_t * sb) |
| { |
| if (sb->head != TCP_INVALID_SACK_HOLE_INDEX) |
| return pool_elt_at_index (sb->holes, sb->head); |
| return 0; |
| } |
| |
| always_inline void |
| scoreboard_clear (sack_scoreboard_t * sb) |
| { |
| sack_scoreboard_hole_t *hole = scoreboard_first_hole (sb); |
| while ((hole = scoreboard_first_hole (sb))) |
| { |
| scoreboard_remove_hole (sb, hole); |
| } |
| } |
| |
| always_inline u32 |
| scoreboard_hole_bytes (sack_scoreboard_hole_t * hole) |
| { |
| return hole->end - hole->start; |
| } |
| |
| always_inline void |
| tcp_cc_algo_register (tcp_cc_algorithm_type_e type, |
| const tcp_cc_algorithm_t * vft) |
| { |
| tcp_main_t *tm = vnet_get_tcp_main (); |
| vec_validate (tm->cc_algos, type); |
| |
| tm->cc_algos[type] = *vft; |
| } |
| |
| always_inline tcp_cc_algorithm_t * |
| tcp_cc_algo_get (tcp_cc_algorithm_type_e type) |
| { |
| tcp_main_t *tm = vnet_get_tcp_main (); |
| return &tm->cc_algos[type]; |
| } |
| |
| void tcp_cc_init (tcp_connection_t * tc); |
| |
| /** |
| * Push TCP header to buffer |
| * |
| * @param vm - vlib_main |
| * @param b - buffer to write the header to |
| * @param sp_net - source port net order |
| * @param dp_net - destination port net order |
| * @param seq - sequence number net order |
| * @param ack - ack number net order |
| * @param tcp_hdr_opts_len - header and options length in bytes |
| * @param flags - header flags |
| * @param wnd - window size |
| * |
| * @return - pointer to start of TCP header |
| */ |
| always_inline void * |
| vlib_buffer_push_tcp_net_order (vlib_buffer_t * b, u16 sp, u16 dp, u32 seq, |
| u32 ack, u8 tcp_hdr_opts_len, u8 flags, |
| u16 wnd) |
| { |
| tcp_header_t *th; |
| |
| th = vlib_buffer_push_uninit (b, tcp_hdr_opts_len); |
| |
| th->src_port = sp; |
| th->dst_port = dp; |
| th->seq_number = seq; |
| th->ack_number = ack; |
| th->data_offset_and_reserved = (tcp_hdr_opts_len >> 2) << 4; |
| th->flags = flags; |
| th->window = wnd; |
| th->checksum = 0; |
| th->urgent_pointer = 0; |
| return th; |
| } |
| |
| /** |
| * Push TCP header to buffer |
| * |
| * @param b - buffer to write the header to |
| * @param sp_net - source port net order |
| * @param dp_net - destination port net order |
| * @param seq - sequence number host order |
| * @param ack - ack number host order |
| * @param tcp_hdr_opts_len - header and options length in bytes |
| * @param flags - header flags |
| * @param wnd - window size |
| * |
| * @return - pointer to start of TCP header |
| */ |
| always_inline void * |
| vlib_buffer_push_tcp (vlib_buffer_t * b, u16 sp_net, u16 dp_net, u32 seq, |
| u32 ack, u8 tcp_hdr_opts_len, u8 flags, u16 wnd) |
| { |
| return vlib_buffer_push_tcp_net_order (b, sp_net, dp_net, |
| clib_host_to_net_u32 (seq), |
| clib_host_to_net_u32 (ack), |
| tcp_hdr_opts_len, flags, |
| clib_host_to_net_u16 (wnd)); |
| } |
| |
| #endif /* _vnet_tcp_h_ */ |
| |
| /* |
| * fd.io coding-style-patch-verification: ON |
| * |
| * Local Variables: |
| * eval: (c-set-style "gnu") |
| * End: |
| */ |