| /* |
| * 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. |
| */ |
| |
| #include <vnet/tcp/tcp.h> |
| #include <vnet/session/session.h> |
| #include <vnet/fib/fib.h> |
| #include <vnet/dpo/load_balance.h> |
| #include <math.h> |
| |
| tcp_main_t tcp_main; |
| |
| static u32 |
| tcp_connection_bind (u32 session_index, ip46_address_t * ip, |
| u16 port_host_byte_order, u8 is_ip4) |
| { |
| tcp_main_t *tm = &tcp_main; |
| tcp_connection_t *listener; |
| |
| pool_get (tm->listener_pool, listener); |
| memset (listener, 0, sizeof (*listener)); |
| |
| listener->c_c_index = listener - tm->listener_pool; |
| listener->c_lcl_port = clib_host_to_net_u16 (port_host_byte_order); |
| |
| if (is_ip4) |
| { |
| listener->c_lcl_ip4.as_u32 = ip->ip4.as_u32; |
| listener->c_is_ip4 = 1; |
| listener->c_proto = SESSION_TYPE_IP4_TCP; |
| } |
| else |
| { |
| clib_memcpy (&listener->c_lcl_ip6, &ip->ip6, sizeof (ip6_address_t)); |
| listener->c_proto = SESSION_TYPE_IP6_TCP; |
| } |
| |
| listener->c_s_index = session_index; |
| listener->state = TCP_STATE_LISTEN; |
| |
| tcp_connection_timers_init (listener); |
| |
| TCP_EVT_DBG (TCP_EVT_BIND, listener); |
| |
| return listener->c_c_index; |
| } |
| |
| u32 |
| tcp_session_bind_ip4 (u32 session_index, ip46_address_t * ip, |
| u16 port_host_byte_order) |
| { |
| return tcp_connection_bind (session_index, ip, port_host_byte_order, 1); |
| } |
| |
| u32 |
| tcp_session_bind_ip6 (u32 session_index, ip46_address_t * ip, |
| u16 port_host_byte_order) |
| { |
| return tcp_connection_bind (session_index, ip, port_host_byte_order, 0); |
| } |
| |
| static void |
| tcp_connection_unbind (u32 listener_index) |
| { |
| tcp_main_t *tm = vnet_get_tcp_main (); |
| tcp_connection_t *tc; |
| |
| tc = pool_elt_at_index (tm->listener_pool, listener_index); |
| |
| TCP_EVT_DBG (TCP_EVT_UNBIND, tc); |
| |
| /* Poison the entry */ |
| if (CLIB_DEBUG > 0) |
| memset (tc, 0xFA, sizeof (*tc)); |
| |
| pool_put_index (tm->listener_pool, listener_index); |
| } |
| |
| u32 |
| tcp_session_unbind (u32 listener_index) |
| { |
| tcp_connection_unbind (listener_index); |
| return 0; |
| } |
| |
| transport_connection_t * |
| tcp_session_get_listener (u32 listener_index) |
| { |
| tcp_main_t *tm = vnet_get_tcp_main (); |
| tcp_connection_t *tc; |
| tc = pool_elt_at_index (tm->listener_pool, listener_index); |
| return &tc->connection; |
| } |
| |
| /** |
| * Cleans up connection state. |
| * |
| * No notifications. |
| */ |
| void |
| tcp_connection_cleanup (tcp_connection_t * tc) |
| { |
| tcp_main_t *tm = &tcp_main; |
| u32 tepi; |
| transport_endpoint_t *tep; |
| |
| /* Cleanup local endpoint if this was an active connect */ |
| tepi = transport_endpoint_lookup (&tm->local_endpoints_table, &tc->c_lcl_ip, |
| tc->c_lcl_port); |
| |
| /*XXX lock */ |
| if (tepi != TRANSPORT_ENDPOINT_INVALID_INDEX) |
| { |
| tep = pool_elt_at_index (tm->local_endpoints, tepi); |
| transport_endpoint_table_del (&tm->local_endpoints_table, tep); |
| pool_put (tm->local_endpoints, tep); |
| } |
| |
| /* Make sure all timers are cleared */ |
| tcp_connection_timers_reset (tc); |
| |
| /* Check if half-open */ |
| if (tc->state == TCP_STATE_SYN_SENT) |
| { |
| /* Poison the entry */ |
| if (CLIB_DEBUG > 0) |
| memset (tc, 0xFA, sizeof (*tc)); |
| pool_put (tm->half_open_connections, tc); |
| } |
| else |
| { |
| int thread_index = tc->c_thread_index; |
| /* Poison the entry */ |
| if (CLIB_DEBUG > 0) |
| memset (tc, 0xFA, sizeof (*tc)); |
| pool_put (tm->connections[thread_index], tc); |
| } |
| } |
| |
| /** |
| * Connection removal. |
| * |
| * This should be called only once connection enters CLOSED state. Note |
| * that it notifies the session of the removal event, so if the goal is to |
| * just remove the connection, call tcp_connection_cleanup instead. |
| */ |
| void |
| tcp_connection_del (tcp_connection_t * tc) |
| { |
| TCP_EVT_DBG (TCP_EVT_DELETE, tc); |
| stream_session_delete_notify (&tc->connection); |
| tcp_connection_cleanup (tc); |
| } |
| |
| /** Notify session that connection has been reset. |
| * |
| * Switch state to closed and wait for session to call cleanup. |
| */ |
| void |
| tcp_connection_reset (tcp_connection_t * tc) |
| { |
| switch (tc->state) |
| { |
| case TCP_STATE_SYN_RCVD: |
| /* Cleanup everything. App wasn't notified yet */ |
| stream_session_delete_notify (&tc->connection); |
| tcp_connection_cleanup (tc); |
| break; |
| case TCP_STATE_SYN_SENT: |
| case TCP_STATE_ESTABLISHED: |
| case TCP_STATE_CLOSE_WAIT: |
| case TCP_STATE_FIN_WAIT_1: |
| case TCP_STATE_FIN_WAIT_2: |
| case TCP_STATE_CLOSING: |
| tc->state = TCP_STATE_CLOSED; |
| |
| /* Make sure all timers are cleared */ |
| tcp_connection_timers_reset (tc); |
| stream_session_reset_notify (&tc->connection); |
| |
| /* Wait for cleanup from session layer but not forever */ |
| tcp_timer_set (tc, TCP_TIMER_WAITCLOSE, TCP_CLEANUP_TIME); |
| break; |
| case TCP_STATE_CLOSED: |
| return; |
| } |
| } |
| |
| /** |
| * Begin connection closing procedure. |
| * |
| * If at the end the connection is not in CLOSED state, it is not removed. |
| * Instead, we rely on on TCP to advance through state machine to either |
| * 1) LAST_ACK (passive close) whereby when the last ACK is received |
| * tcp_connection_del is called. This notifies session of the delete and |
| * calls cleanup. |
| * 2) TIME_WAIT (active close) whereby after 2MSL the 2MSL timer triggers |
| * and cleanup is called. |
| * |
| * N.B. Half-close connections are not supported |
| */ |
| void |
| tcp_connection_close (tcp_connection_t * tc) |
| { |
| TCP_EVT_DBG (TCP_EVT_CLOSE, tc); |
| |
| /* Send FIN if needed */ |
| if (tc->state == TCP_STATE_ESTABLISHED |
| || tc->state == TCP_STATE_SYN_RCVD || tc->state == TCP_STATE_CLOSE_WAIT) |
| tcp_send_fin (tc); |
| |
| /* Switch state */ |
| if (tc->state == TCP_STATE_ESTABLISHED || tc->state == TCP_STATE_SYN_RCVD) |
| tc->state = TCP_STATE_FIN_WAIT_1; |
| else if (tc->state == TCP_STATE_SYN_SENT) |
| tc->state = TCP_STATE_CLOSED; |
| else if (tc->state == TCP_STATE_CLOSE_WAIT) |
| tc->state = TCP_STATE_LAST_ACK; |
| |
| /* If in CLOSED and WAITCLOSE timer is not set, delete connection now */ |
| if (tc->timers[TCP_TIMER_WAITCLOSE] == TCP_TIMER_HANDLE_INVALID |
| && tc->state == TCP_STATE_CLOSED) |
| tcp_connection_del (tc); |
| } |
| |
| void |
| tcp_session_close (u32 conn_index, u32 thread_index) |
| { |
| tcp_connection_t *tc; |
| tc = tcp_connection_get (conn_index, thread_index); |
| tcp_connection_close (tc); |
| } |
| |
| void |
| tcp_session_cleanup (u32 conn_index, u32 thread_index) |
| { |
| tcp_connection_t *tc; |
| tc = tcp_connection_get (conn_index, thread_index); |
| |
| /* Wait for the session tx events to clear */ |
| tc->state = TCP_STATE_CLOSED; |
| tcp_timer_update (tc, TCP_TIMER_WAITCLOSE, TCP_CLEANUP_TIME); |
| } |
| |
| void * |
| ip_interface_get_first_ip (u32 sw_if_index, u8 is_ip4) |
| { |
| ip_lookup_main_t *lm4 = &ip4_main.lookup_main; |
| ip_lookup_main_t *lm6 = &ip6_main.lookup_main; |
| ip_interface_address_t *ia = 0; |
| |
| if (is_ip4) |
| { |
| /* *INDENT-OFF* */ |
| foreach_ip_interface_address (lm4, ia, sw_if_index, 1 /* unnumbered */ , |
| ({ |
| return ip_interface_address_get_address (lm4, ia); |
| })); |
| /* *INDENT-ON* */ |
| } |
| else |
| { |
| /* *INDENT-OFF* */ |
| foreach_ip_interface_address (lm6, ia, sw_if_index, 1 /* unnumbered */ , |
| ({ |
| return ip_interface_address_get_address (lm6, ia); |
| })); |
| /* *INDENT-ON* */ |
| } |
| |
| return 0; |
| } |
| |
| #define PORT_MASK ((1 << 16)- 1) |
| /** |
| * Allocate local port and add if successful add entry to local endpoint |
| * table to mark the pair as used. |
| */ |
| u16 |
| tcp_allocate_local_port (tcp_main_t * tm, ip46_address_t * ip) |
| { |
| transport_endpoint_t *tep; |
| u32 time_now, tei; |
| u16 min = 1024, max = 65535; /* XXX configurable ? */ |
| int tries; |
| |
| tries = max - min; |
| time_now = tcp_time_now (); |
| |
| /* Only support active opens from thread 0 */ |
| ASSERT (vlib_get_thread_index () == 0); |
| |
| /* Start at random point or max */ |
| pool_get (tm->local_endpoints, tep); |
| clib_memcpy (&tep->ip, ip, sizeof (*ip)); |
| |
| /* Search for first free slot */ |
| for (; tries >= 0; tries--) |
| { |
| u16 port = 0; |
| |
| /* Find a port in the specified range */ |
| while (1) |
| { |
| port = random_u32 (&time_now) & PORT_MASK; |
| if (PREDICT_TRUE (port >= min && port < max)) |
| break; |
| } |
| |
| tep->port = port; |
| |
| /* Look it up */ |
| tei = transport_endpoint_lookup (&tm->local_endpoints_table, &tep->ip, |
| tep->port); |
| /* If not found, we're done */ |
| if (tei == TRANSPORT_ENDPOINT_INVALID_INDEX) |
| { |
| transport_endpoint_table_add (&tm->local_endpoints_table, tep, |
| tep - tm->local_endpoints); |
| return tep->port; |
| } |
| } |
| /* No free ports */ |
| pool_put (tm->local_endpoints, tep); |
| return -1; |
| } |
| |
| /** |
| * Initialize all connection timers as invalid |
| */ |
| void |
| tcp_connection_timers_init (tcp_connection_t * tc) |
| { |
| int i; |
| |
| /* Set all to invalid */ |
| for (i = 0; i < TCP_N_TIMERS; i++) |
| { |
| tc->timers[i] = TCP_TIMER_HANDLE_INVALID; |
| } |
| |
| tc->rto = TCP_RTO_INIT; |
| } |
| |
| /** |
| * Stop all connection timers |
| */ |
| void |
| tcp_connection_timers_reset (tcp_connection_t * tc) |
| { |
| int i; |
| for (i = 0; i < TCP_N_TIMERS; i++) |
| { |
| tcp_timer_reset (tc, i); |
| } |
| } |
| |
| #if 0 |
| typedef struct ip4_tcp_hdr |
| { |
| ip4_header_t ip; |
| tcp_header_t tcp; |
| } ip4_tcp_hdr_t; |
| |
| typedef struct ip6_tcp_hdr |
| { |
| ip6_header_t ip; |
| tcp_header_t tcp; |
| } ip6_tcp_hdr_t; |
| |
| static void |
| tcp_connection_select_lb_bucket (tcp_connection_t * tc, const dpo_id_t * dpo, |
| dpo_id_t * result) |
| { |
| const dpo_id_t *choice; |
| load_balance_t *lb; |
| int hash; |
| |
| lb = load_balance_get (dpo->dpoi_index); |
| if (tc->c_is_ip4) |
| { |
| ip4_tcp_hdr_t hdr; |
| memset (&hdr, 0, sizeof (hdr)); |
| hdr.ip.protocol = IP_PROTOCOL_TCP; |
| hdr.ip.address_pair.src.as_u32 = tc->c_lcl_ip.ip4.as_u32; |
| hdr.ip.address_pair.dst.as_u32 = tc->c_rmt_ip.ip4.as_u32; |
| hdr.tcp.src_port = tc->c_lcl_port; |
| hdr.tcp.dst_port = tc->c_rmt_port; |
| hash = ip4_compute_flow_hash (&hdr.ip, lb->lb_hash_config); |
| } |
| else |
| { |
| ip6_tcp_hdr_t hdr; |
| memset (&hdr, 0, sizeof (hdr)); |
| hdr.ip.protocol = IP_PROTOCOL_TCP; |
| clib_memcpy (&hdr.ip.src_address, &tc->c_lcl_ip.ip6, |
| sizeof (ip6_address_t)); |
| clib_memcpy (&hdr.ip.dst_address, &tc->c_rmt_ip.ip6, |
| sizeof (ip6_address_t)); |
| hdr.tcp.src_port = tc->c_lcl_port; |
| hdr.tcp.dst_port = tc->c_rmt_port; |
| hash = ip6_compute_flow_hash (&hdr.ip, lb->lb_hash_config); |
| } |
| choice = load_balance_get_bucket_i (lb, hash & lb->lb_n_buckets_minus_1); |
| dpo_copy (result, choice); |
| } |
| |
| fib_node_index_t |
| tcp_lookup_rmt_in_fib (tcp_connection_t * tc) |
| { |
| fib_prefix_t prefix; |
| |
| clib_memcpy (&prefix.fp_addr, &tc->c_rmt_ip, sizeof (prefix.fp_addr)); |
| prefix.fp_proto = tc->c_is_ip4 ? FIB_PROTOCOL_IP4 : FIB_PROTOCOL_IP6; |
| prefix.fp_len = tc->c_is_ip4 ? 32 : 128; |
| return fib_table_lookup (0, &prefix); |
| } |
| |
| static int |
| tcp_connection_stack_on_fib_entry (tcp_connection_t * tc) |
| { |
| dpo_id_t choice = DPO_INVALID; |
| u32 output_node_index; |
| fib_entry_t *fe; |
| |
| fe = fib_entry_get (tc->c_rmt_fei); |
| if (fe->fe_lb.dpoi_type != DPO_LOAD_BALANCE) |
| return -1; |
| |
| tcp_connection_select_lb_bucket (tc, &fe->fe_lb, &choice); |
| |
| output_node_index = |
| tc->c_is_ip4 ? tcp4_output_node.index : tcp6_output_node.index; |
| dpo_stack_from_node (output_node_index, &tc->c_rmt_dpo, &choice); |
| return 0; |
| } |
| |
| /** Stack tcp connection on peer's fib entry. |
| * |
| * This ultimately populates the dpo the connection will use to send packets. |
| */ |
| static void |
| tcp_connection_fib_attach (tcp_connection_t * tc) |
| { |
| tc->c_rmt_fei = tcp_lookup_rmt_in_fib (tc); |
| |
| ASSERT (tc->c_rmt_fei != FIB_NODE_INDEX_INVALID); |
| |
| tcp_connection_stack_on_fib_entry (tc); |
| } |
| #endif /* 0 */ |
| |
| /** Initialize tcp connection variables |
| * |
| * Should be called after having received a msg from the peer, i.e., a SYN or |
| * a SYNACK, such that connection options have already been exchanged. */ |
| void |
| tcp_connection_init_vars (tcp_connection_t * tc) |
| { |
| tcp_connection_timers_init (tc); |
| tcp_init_mss (tc); |
| scoreboard_init (&tc->sack_sb); |
| tcp_cc_init (tc); |
| // tcp_connection_fib_attach (tc); |
| } |
| |
| int |
| tcp_connection_open (ip46_address_t * rmt_addr, u16 rmt_port, u8 is_ip4) |
| { |
| tcp_main_t *tm = vnet_get_tcp_main (); |
| tcp_connection_t *tc; |
| fib_prefix_t prefix; |
| fib_node_index_t fei; |
| u32 sw_if_index; |
| ip46_address_t lcl_addr; |
| u16 lcl_port; |
| |
| /* |
| * Find the local address and allocate port |
| */ |
| memset (&lcl_addr, 0, sizeof (lcl_addr)); |
| |
| /* Find a FIB path to the destination */ |
| clib_memcpy (&prefix.fp_addr, rmt_addr, sizeof (*rmt_addr)); |
| prefix.fp_proto = is_ip4 ? FIB_PROTOCOL_IP4 : FIB_PROTOCOL_IP6; |
| prefix.fp_len = is_ip4 ? 32 : 128; |
| |
| fei = fib_table_lookup (0, &prefix); |
| |
| /* Couldn't find route to destination. Bail out. */ |
| if (fei == FIB_NODE_INDEX_INVALID) |
| return -1; |
| |
| sw_if_index = fib_entry_get_resolving_interface (fei); |
| |
| if (sw_if_index == (u32) ~ 0) |
| return -1; |
| |
| if (is_ip4) |
| { |
| ip4_address_t *ip4; |
| int index; |
| if (vec_len (tm->ip4_src_addresses)) |
| { |
| index = tm->last_v4_address_rotor++; |
| if (tm->last_v4_address_rotor >= vec_len (tm->ip4_src_addresses)) |
| tm->last_v4_address_rotor = 0; |
| lcl_addr.ip4.as_u32 = tm->ip4_src_addresses[index].as_u32; |
| } |
| else |
| { |
| ip4 = ip_interface_get_first_ip (sw_if_index, 1); |
| lcl_addr.ip4.as_u32 = ip4->as_u32; |
| } |
| } |
| else |
| { |
| ip6_address_t *ip6; |
| int index; |
| |
| if (vec_len (tm->ip6_src_addresses)) |
| { |
| index = tm->last_v6_address_rotor++; |
| if (tm->last_v6_address_rotor >= vec_len (tm->ip6_src_addresses)) |
| tm->last_v6_address_rotor = 0; |
| clib_memcpy (&lcl_addr.ip6, &tm->ip6_src_addresses[index], |
| sizeof (*ip6)); |
| } |
| else |
| { |
| ip6 = ip_interface_get_first_ip (sw_if_index, 0); |
| clib_memcpy (&lcl_addr.ip6, ip6, sizeof (*ip6)); |
| } |
| } |
| |
| /* Allocate source port */ |
| lcl_port = tcp_allocate_local_port (tm, &lcl_addr); |
| if (lcl_port < 1) |
| { |
| clib_warning ("Failed to allocate src port"); |
| return -1; |
| } |
| |
| /* |
| * Create connection and send SYN |
| */ |
| |
| pool_get (tm->half_open_connections, tc); |
| memset (tc, 0, sizeof (*tc)); |
| |
| clib_memcpy (&tc->c_rmt_ip, rmt_addr, sizeof (ip46_address_t)); |
| clib_memcpy (&tc->c_lcl_ip, &lcl_addr, sizeof (ip46_address_t)); |
| tc->c_rmt_port = clib_host_to_net_u16 (rmt_port); |
| tc->c_lcl_port = clib_host_to_net_u16 (lcl_port); |
| tc->c_c_index = tc - tm->half_open_connections; |
| tc->c_is_ip4 = is_ip4; |
| tc->c_proto = is_ip4 ? SESSION_TYPE_IP4_TCP : SESSION_TYPE_IP6_TCP; |
| |
| /* The other connection vars will be initialized after SYN ACK */ |
| tcp_connection_timers_init (tc); |
| |
| tcp_send_syn (tc); |
| |
| tc->state = TCP_STATE_SYN_SENT; |
| |
| TCP_EVT_DBG (TCP_EVT_OPEN, tc); |
| |
| return tc->c_c_index; |
| } |
| |
| int |
| tcp_session_open_ip4 (ip46_address_t * addr, u16 port) |
| { |
| return tcp_connection_open (addr, port, 1); |
| } |
| |
| int |
| tcp_session_open_ip6 (ip46_address_t * addr, u16 port) |
| { |
| return tcp_connection_open (addr, port, 0); |
| } |
| |
| const char *tcp_dbg_evt_str[] = { |
| #define _(sym, str) str, |
| foreach_tcp_dbg_evt |
| #undef _ |
| }; |
| |
| const char *tcp_fsm_states[] = { |
| #define _(sym, str) str, |
| foreach_tcp_fsm_state |
| #undef _ |
| }; |
| |
| u8 * |
| format_tcp_state (u8 * s, va_list * args) |
| { |
| u32 state = va_arg (*args, u32); |
| |
| if (state < TCP_N_STATES) |
| s = format (s, "%s", tcp_fsm_states[state]); |
| else |
| s = format (s, "UNKNOWN (%d (0x%x))", state, state); |
| return s; |
| } |
| |
| const char *tcp_conn_timers[] = { |
| #define _(sym, str) str, |
| foreach_tcp_timer |
| #undef _ |
| }; |
| |
| u8 * |
| format_tcp_timers (u8 * s, va_list * args) |
| { |
| tcp_connection_t *tc = va_arg (*args, tcp_connection_t *); |
| int i, last = -1; |
| |
| for (i = 0; i < TCP_N_TIMERS; i++) |
| if (tc->timers[i] != TCP_TIMER_HANDLE_INVALID) |
| last = i; |
| |
| s = format (s, "["); |
| for (i = 0; i < last; i++) |
| { |
| if (tc->timers[i] != TCP_TIMER_HANDLE_INVALID) |
| s = format (s, "%s,", tcp_conn_timers[i]); |
| } |
| |
| if (last >= 0) |
| s = format (s, "%s]", tcp_conn_timers[i]); |
| else |
| s = format (s, "]"); |
| |
| return s; |
| } |
| |
| u8 * |
| format_tcp_congestion_status (u8 * s, va_list * args) |
| { |
| tcp_connection_t *tc = va_arg (*args, tcp_connection_t *); |
| if (tcp_in_recovery (tc)) |
| s = format (s, "recovery"); |
| else if (tcp_in_fastrecovery (tc)) |
| s = format (s, "fastrecovery"); |
| else |
| s = format (s, "none"); |
| return s; |
| } |
| |
| u8 * |
| format_tcp_vars (u8 * s, va_list * args) |
| { |
| tcp_connection_t *tc = va_arg (*args, tcp_connection_t *); |
| s = format (s, " snd_una %u snd_nxt %u snd_una_max %u", |
| tc->snd_una - tc->iss, tc->snd_nxt - tc->iss, |
| tc->snd_una_max - tc->iss); |
| s = format (s, " rcv_nxt %u rcv_las %u\n", |
| tc->rcv_nxt - tc->irs, tc->rcv_las - tc->irs); |
| s = format (s, " snd_wnd %u rcv_wnd %u snd_wl1 %u snd_wl2 %u\n", |
| tc->snd_wnd, tc->rcv_wnd, tc->snd_wl1 - tc->irs, |
| tc->snd_wl2 - tc->iss); |
| s = format (s, " flight size %u send space %u rcv_wnd_av %d\n", |
| tcp_flight_size (tc), tcp_available_snd_space (tc), |
| tcp_rcv_wnd_available (tc)); |
| s = format (s, " cong %U ", format_tcp_congestion_status, tc); |
| s = format (s, "cwnd %u ssthresh %u rtx_bytes %u bytes_acked %u\n", |
| tc->cwnd, tc->ssthresh, tc->snd_rxt_bytes, tc->bytes_acked); |
| s = format (s, " prev_ssthresh %u snd_congestion %u dupack %u", |
| tc->prev_ssthresh, tc->snd_congestion - tc->iss, |
| tc->rcv_dupacks); |
| s = format (s, " limited_transmit %u\n", tc->limited_transmit - tc->iss); |
| s = format (s, " tsecr %u tsecr_last_ack %u\n", tc->rcv_opts.tsecr, |
| tc->tsecr_last_ack); |
| s = format (s, " rto %u rto_boff %u srtt %u rttvar %u rtt_ts %u ", tc->rto, |
| tc->rto_boff, tc->srtt, tc->rttvar, tc->rtt_ts); |
| s = format (s, "rtt_seq %u\n", tc->rtt_seq); |
| s = format (s, " tsval_recent %u tsval_recent_age %u\n", tc->tsval_recent, |
| tcp_time_now () - tc->tsval_recent_age); |
| s = format (s, " scoreboard: %U\n", format_tcp_scoreboard, &tc->sack_sb); |
| if (vec_len (tc->snd_sacks)) |
| s = format (s, " sacks tx: %U\n", format_tcp_sacks, tc); |
| |
| return s; |
| } |
| |
| u8 * |
| format_tcp_connection_id (u8 * s, va_list * args) |
| { |
| tcp_connection_t *tc = va_arg (*args, tcp_connection_t *); |
| if (!tc) |
| return s; |
| if (tc->c_is_ip4) |
| { |
| s = format (s, "[#%d][%s] %U:%d->%U:%d", tc->c_thread_index, "T", |
| format_ip4_address, &tc->c_lcl_ip4, |
| clib_net_to_host_u16 (tc->c_lcl_port), format_ip4_address, |
| &tc->c_rmt_ip4, clib_net_to_host_u16 (tc->c_rmt_port)); |
| } |
| else |
| { |
| s = format (s, "[#%d][%s] %U:%d->%U:%d", tc->c_thread_index, "T", |
| format_ip6_address, &tc->c_lcl_ip6, |
| clib_net_to_host_u16 (tc->c_lcl_port), format_ip6_address, |
| &tc->c_rmt_ip6, clib_net_to_host_u16 (tc->c_rmt_port)); |
| } |
| |
| return s; |
| } |
| |
| u8 * |
| format_tcp_connection (u8 * s, va_list * args) |
| { |
| tcp_connection_t *tc = va_arg (*args, tcp_connection_t *); |
| u32 verbose = va_arg (*args, u32); |
| |
| s = format (s, "%-50U", format_tcp_connection_id, tc); |
| if (verbose) |
| { |
| s = format (s, "%-15U", format_tcp_state, tc->state); |
| if (verbose > 1) |
| s = format (s, " %U\n%U", format_tcp_timers, tc, format_tcp_vars, tc); |
| } |
| return s; |
| } |
| |
| u8 * |
| format_tcp_session (u8 * s, va_list * args) |
| { |
| u32 tci = va_arg (*args, u32); |
| u32 thread_index = va_arg (*args, u32); |
| u32 verbose = va_arg (*args, u32); |
| tcp_connection_t *tc; |
| |
| tc = tcp_connection_get (tci, thread_index); |
| if (tc) |
| s = format (s, "%U", format_tcp_connection, tc, verbose); |
| else |
| s = format (s, "empty"); |
| return s; |
| } |
| |
| u8 * |
| format_tcp_listener_session (u8 * s, va_list * args) |
| { |
| u32 tci = va_arg (*args, u32); |
| tcp_connection_t *tc = tcp_listener_get (tci); |
| return format (s, "%U", format_tcp_connection_id, tc); |
| } |
| |
| u8 * |
| format_tcp_half_open_session (u8 * s, va_list * args) |
| { |
| u32 tci = va_arg (*args, u32); |
| tcp_connection_t *tc = tcp_half_open_connection_get (tci); |
| return format (s, "%U", format_tcp_connection_id, tc); |
| } |
| |
| u8 * |
| format_tcp_sacks (u8 * s, va_list * args) |
| { |
| tcp_connection_t *tc = va_arg (*args, tcp_connection_t *); |
| sack_block_t *sacks = tc->snd_sacks; |
| sack_block_t *block; |
| int i, len = 0; |
| |
| len = vec_len (sacks); |
| for (i = 0; i < len - 1; i++) |
| { |
| block = &sacks[i]; |
| s = format (s, " start %u end %u\n", block->start - tc->irs, |
| block->end - tc->irs); |
| } |
| if (len) |
| { |
| block = &sacks[len - 1]; |
| s = format (s, " start %u end %u", block->start - tc->irs, |
| block->end - tc->irs); |
| } |
| return s; |
| } |
| |
| u8 * |
| format_tcp_sack_hole (u8 * s, va_list * args) |
| { |
| sack_scoreboard_hole_t *hole = va_arg (*args, sack_scoreboard_hole_t *); |
| s = format (s, "[%u, %u]", hole->start, hole->end); |
| return s; |
| } |
| |
| u8 * |
| format_tcp_scoreboard (u8 * s, va_list * args) |
| { |
| sack_scoreboard_t *sb = va_arg (*args, sack_scoreboard_t *); |
| sack_scoreboard_hole_t *hole; |
| s = format (s, "sacked_bytes %u last_sacked_bytes %u lost_bytes %u\n", |
| sb->sacked_bytes, sb->last_sacked_bytes, sb->lost_bytes); |
| s = format (s, " last_bytes_delivered %u high_sacked %u snd_una_adv %u\n", |
| sb->last_bytes_delivered, sb->high_sacked, sb->snd_una_adv); |
| s = format (s, " cur_rxt_hole %u high_rxt %u rescue_rxt %u", |
| sb->cur_rxt_hole, sb->high_rxt, sb->rescue_rxt); |
| |
| hole = scoreboard_first_hole (sb); |
| if (hole) |
| s = format (s, "\n head %u tail %u holes:\n", sb->head, sb->tail); |
| |
| while (hole) |
| { |
| s = format (s, "%U", format_tcp_sack_hole, hole); |
| hole = scoreboard_next_hole (sb, hole); |
| } |
| return s; |
| } |
| |
| transport_connection_t * |
| tcp_session_get_transport (u32 conn_index, u32 thread_index) |
| { |
| tcp_connection_t *tc = tcp_connection_get (conn_index, thread_index); |
| return &tc->connection; |
| } |
| |
| transport_connection_t * |
| tcp_half_open_session_get_transport (u32 conn_index) |
| { |
| tcp_connection_t *tc = tcp_half_open_connection_get (conn_index); |
| return &tc->connection; |
| } |
| |
| /** |
| * Compute maximum segment size for session layer. |
| * |
| * Since the result needs to be the actual data length, it first computes |
| * the tcp options to be used in the next burst and subtracts their |
| * length from the connection's snd_mss. |
| */ |
| u16 |
| tcp_session_send_mss (transport_connection_t * trans_conn) |
| { |
| tcp_connection_t *tc = (tcp_connection_t *) trans_conn; |
| |
| /* Ensure snd_mss does accurately reflect the amount of data we can push |
| * in a segment. This also makes sure that options are updated according to |
| * the current state of the connection. */ |
| tcp_update_snd_mss (tc); |
| |
| return tc->snd_mss; |
| } |
| |
| always_inline u32 |
| tcp_round_snd_space (tcp_connection_t * tc, u32 snd_space) |
| { |
| if (PREDICT_FALSE (tc->snd_wnd < tc->snd_mss)) |
| { |
| return tc->snd_wnd <= snd_space ? tc->snd_wnd : 0; |
| } |
| |
| /* If we can't write at least a segment, don't try at all */ |
| if (PREDICT_FALSE (snd_space < tc->snd_mss)) |
| { |
| if (snd_space > clib_min (tc->mss, tc->rcv_opts.mss) - TCP_HDR_LEN_MAX) |
| return snd_space; |
| return 0; |
| } |
| |
| /* round down to mss multiple */ |
| return snd_space - (snd_space % tc->snd_mss); |
| } |
| |
| /** |
| * Compute tx window session is allowed to fill. |
| * |
| * Takes into account available send space, snd_mss and the congestion |
| * state of the connection. If possible, the value returned is a multiple |
| * of snd_mss. |
| * |
| * @param tc tcp connection |
| * @return number of bytes session is allowed to write |
| */ |
| u32 |
| tcp_snd_space (tcp_connection_t * tc) |
| { |
| int snd_space, snt_limited; |
| |
| if (PREDICT_TRUE (tcp_in_cong_recovery (tc) == 0)) |
| { |
| snd_space = tcp_available_snd_space (tc); |
| |
| /* If we haven't gotten dupacks or if we did and have gotten sacked |
| * bytes then we can still send as per Limited Transmit (RFC3042) */ |
| if (PREDICT_FALSE (tc->rcv_dupacks != 0 |
| && (tcp_opts_sack_permitted (tc) |
| && tc->sack_sb.last_sacked_bytes == 0))) |
| { |
| if (tc->rcv_dupacks == 1 && tc->limited_transmit != tc->snd_nxt) |
| tc->limited_transmit = tc->snd_nxt; |
| ASSERT (seq_leq (tc->limited_transmit, tc->snd_nxt)); |
| |
| snt_limited = tc->snd_nxt - tc->limited_transmit; |
| snd_space = clib_max (2 * tc->snd_mss - snt_limited, 0); |
| } |
| return tcp_round_snd_space (tc, snd_space); |
| } |
| |
| if (tcp_in_recovery (tc)) |
| { |
| tc->snd_nxt = tc->snd_una_max; |
| snd_space = tcp_available_wnd (tc) - tc->snd_rxt_bytes |
| - (tc->snd_una_max - tc->snd_congestion); |
| if (snd_space <= 0 || (tc->snd_una_max - tc->snd_una) >= tc->snd_wnd) |
| return 0; |
| return tcp_round_snd_space (tc, snd_space); |
| } |
| |
| /* If in fast recovery, send 1 SMSS if wnd allows */ |
| if (tcp_in_fastrecovery (tc) |
| && tcp_available_snd_space (tc) && !tcp_fastrecovery_sent_1_smss (tc)) |
| { |
| tcp_fastrecovery_1_smss_on (tc); |
| return tc->snd_mss; |
| } |
| |
| return 0; |
| } |
| |
| u32 |
| tcp_session_send_space (transport_connection_t * trans_conn) |
| { |
| tcp_connection_t *tc = (tcp_connection_t *) trans_conn; |
| return tcp_snd_space (tc); |
| } |
| |
| i32 |
| tcp_rcv_wnd_available (tcp_connection_t * tc) |
| { |
| return (i32) tc->rcv_wnd - (tc->rcv_nxt - tc->rcv_las); |
| } |
| |
| u32 |
| tcp_session_tx_fifo_offset (transport_connection_t * trans_conn) |
| { |
| tcp_connection_t *tc = (tcp_connection_t *) trans_conn; |
| |
| ASSERT (seq_geq (tc->snd_nxt, tc->snd_una)); |
| |
| /* This still works if fast retransmit is on */ |
| return (tc->snd_nxt - tc->snd_una); |
| } |
| |
| /* *INDENT-OFF* */ |
| const static transport_proto_vft_t tcp4_proto = { |
| .bind = tcp_session_bind_ip4, |
| .unbind = tcp_session_unbind, |
| .push_header = tcp_push_header, |
| .get_connection = tcp_session_get_transport, |
| .get_listener = tcp_session_get_listener, |
| .get_half_open = tcp_half_open_session_get_transport, |
| .open = tcp_session_open_ip4, |
| .close = tcp_session_close, |
| .cleanup = tcp_session_cleanup, |
| .send_mss = tcp_session_send_mss, |
| .send_space = tcp_session_send_space, |
| .tx_fifo_offset = tcp_session_tx_fifo_offset, |
| .format_connection = format_tcp_session, |
| .format_listener = format_tcp_listener_session, |
| .format_half_open = format_tcp_half_open_session, |
| }; |
| |
| const static transport_proto_vft_t tcp6_proto = { |
| .bind = tcp_session_bind_ip6, |
| .unbind = tcp_session_unbind, |
| .push_header = tcp_push_header, |
| .get_connection = tcp_session_get_transport, |
| .get_listener = tcp_session_get_listener, |
| .get_half_open = tcp_half_open_session_get_transport, |
| .open = tcp_session_open_ip6, |
| .close = tcp_session_close, |
| .cleanup = tcp_session_cleanup, |
| .send_mss = tcp_session_send_mss, |
| .send_space = tcp_session_send_space, |
| .tx_fifo_offset = tcp_session_tx_fifo_offset, |
| .format_connection = format_tcp_session, |
| .format_listener = format_tcp_listener_session, |
| .format_half_open = format_tcp_half_open_session, |
| }; |
| /* *INDENT-ON* */ |
| |
| void |
| tcp_timer_keep_handler (u32 conn_index) |
| { |
| u32 thread_index = vlib_get_thread_index (); |
| tcp_connection_t *tc; |
| |
| tc = tcp_connection_get (conn_index, thread_index); |
| tc->timers[TCP_TIMER_KEEP] = TCP_TIMER_HANDLE_INVALID; |
| |
| tcp_connection_close (tc); |
| } |
| |
| void |
| tcp_timer_establish_handler (u32 conn_index) |
| { |
| tcp_connection_t *tc; |
| u8 sst; |
| |
| tc = tcp_half_open_connection_get (conn_index); |
| tc->timers[TCP_TIMER_ESTABLISH] = TCP_TIMER_HANDLE_INVALID; |
| |
| ASSERT (tc->state == TCP_STATE_SYN_SENT); |
| |
| sst = tc->c_is_ip4 ? SESSION_TYPE_IP4_TCP : SESSION_TYPE_IP6_TCP; |
| stream_session_connect_notify (&tc->connection, sst, 1 /* fail */ ); |
| |
| tcp_connection_cleanup (tc); |
| } |
| |
| void |
| tcp_timer_waitclose_handler (u32 conn_index) |
| { |
| u32 thread_index = vlib_get_thread_index (); |
| tcp_connection_t *tc; |
| |
| tc = tcp_connection_get (conn_index, thread_index); |
| tc->timers[TCP_TIMER_WAITCLOSE] = TCP_TIMER_HANDLE_INVALID; |
| |
| /* Session didn't come back with a close(). Send FIN either way |
| * and switch to LAST_ACK. */ |
| if (tc->state == TCP_STATE_CLOSE_WAIT) |
| { |
| if (tc->flags & TCP_CONN_FINSNT) |
| { |
| clib_warning ("FIN was sent and still in CLOSE WAIT. Weird!"); |
| } |
| |
| tcp_send_fin (tc); |
| tc->state = TCP_STATE_LAST_ACK; |
| |
| /* Make sure we don't wait in LAST ACK forever */ |
| tcp_timer_set (tc, TCP_TIMER_WAITCLOSE, TCP_2MSL_TIME); |
| |
| /* Don't delete the connection yet */ |
| return; |
| } |
| |
| tcp_connection_del (tc); |
| } |
| |
| /* *INDENT-OFF* */ |
| static timer_expiration_handler *timer_expiration_handlers[TCP_N_TIMERS] = |
| { |
| tcp_timer_retransmit_handler, |
| tcp_timer_delack_handler, |
| tcp_timer_persist_handler, |
| tcp_timer_keep_handler, |
| tcp_timer_waitclose_handler, |
| tcp_timer_retransmit_syn_handler, |
| tcp_timer_establish_handler |
| }; |
| /* *INDENT-ON* */ |
| |
| static void |
| tcp_expired_timers_dispatch (u32 * expired_timers) |
| { |
| int i; |
| u32 connection_index, timer_id; |
| |
| for (i = 0; i < vec_len (expired_timers); i++) |
| { |
| /* Get session index and timer id */ |
| connection_index = expired_timers[i] & 0x0FFFFFFF; |
| timer_id = expired_timers[i] >> 28; |
| |
| TCP_EVT_DBG (TCP_EVT_TIMER_POP, connection_index, timer_id); |
| |
| /* Handle expiration */ |
| (*timer_expiration_handlers[timer_id]) (connection_index); |
| } |
| } |
| |
| void |
| tcp_initialize_timer_wheels (tcp_main_t * tm) |
| { |
| tw_timer_wheel_16t_2w_512sl_t *tw; |
| /* *INDENT-OFF* */ |
| foreach_vlib_main (({ |
| tw = &tm->timer_wheels[ii]; |
| tw_timer_wheel_init_16t_2w_512sl (tw, tcp_expired_timers_dispatch, |
| 100e-3 /* timer period 100ms */ , ~0); |
| tw->last_run_time = vlib_time_now (this_vlib_main); |
| })); |
| /* *INDENT-ON* */ |
| } |
| |
| clib_error_t * |
| tcp_main_enable (vlib_main_t * vm) |
| { |
| tcp_main_t *tm = vnet_get_tcp_main (); |
| ip_protocol_info_t *pi; |
| ip_main_t *im = &ip_main; |
| vlib_thread_main_t *vtm = vlib_get_thread_main (); |
| clib_error_t *error = 0; |
| u32 num_threads; |
| int thread, i; |
| tcp_connection_t *tc __attribute__ ((unused)); |
| |
| if ((error = vlib_call_init_function (vm, ip_main_init))) |
| return error; |
| if ((error = vlib_call_init_function (vm, ip4_lookup_init))) |
| return error; |
| if ((error = vlib_call_init_function (vm, ip6_lookup_init))) |
| return error; |
| |
| /* |
| * Registrations |
| */ |
| |
| /* Register with IP */ |
| pi = ip_get_protocol_info (im, IP_PROTOCOL_TCP); |
| if (pi == 0) |
| return clib_error_return (0, "TCP protocol info AWOL"); |
| pi->format_header = format_tcp_header; |
| pi->unformat_pg_edit = unformat_pg_tcp_header; |
| |
| ip4_register_protocol (IP_PROTOCOL_TCP, tcp4_input_node.index); |
| |
| /* Register as transport with URI */ |
| session_register_transport (SESSION_TYPE_IP4_TCP, &tcp4_proto); |
| session_register_transport (SESSION_TYPE_IP6_TCP, &tcp6_proto); |
| |
| /* |
| * Initialize data structures |
| */ |
| |
| num_threads = 1 /* main thread */ + vtm->n_threads; |
| vec_validate (tm->connections, num_threads - 1); |
| |
| /* |
| * Preallocate connections |
| */ |
| for (thread = 0; thread < num_threads; thread++) |
| { |
| for (i = 0; i < tm->preallocated_connections; i++) |
| pool_get (tm->connections[thread], tc); |
| |
| for (i = 0; i < tm->preallocated_connections; i++) |
| pool_put_index (tm->connections[thread], i); |
| } |
| |
| /* |
| * Preallocate half-open connections |
| */ |
| for (i = 0; i < tm->preallocated_half_open_connections; i++) |
| pool_get (tm->half_open_connections, tc); |
| |
| for (i = 0; i < tm->preallocated_half_open_connections; i++) |
| pool_put_index (tm->half_open_connections, i); |
| |
| /* Initialize per worker thread tx buffers (used for control messages) */ |
| vec_validate (tm->tx_buffers, num_threads - 1); |
| |
| /* Initialize timer wheels */ |
| vec_validate (tm->timer_wheels, num_threads - 1); |
| tcp_initialize_timer_wheels (tm); |
| |
| /* Initialize clocks per tick for TCP timestamp. Used to compute |
| * monotonically increasing timestamps. */ |
| tm->tstamp_ticks_per_clock = vm->clib_time.seconds_per_clock |
| / TCP_TSTAMP_RESOLUTION; |
| |
| clib_bihash_init_24_8 (&tm->local_endpoints_table, "local endpoint table", |
| 200000 /* $$$$ config parameter nbuckets */ , |
| (64 << 20) /*$$$ config parameter table size */ ); |
| |
| return error; |
| } |
| |
| clib_error_t * |
| vnet_tcp_enable_disable (vlib_main_t * vm, u8 is_en) |
| { |
| if (is_en) |
| { |
| if (tcp_main.is_enabled) |
| return 0; |
| |
| return tcp_main_enable (vm); |
| } |
| else |
| { |
| tcp_main.is_enabled = 0; |
| } |
| |
| return 0; |
| } |
| |
| clib_error_t * |
| tcp_init (vlib_main_t * vm) |
| { |
| tcp_main_t *tm = vnet_get_tcp_main (); |
| |
| tm->vnet_main = vnet_get_main (); |
| tm->is_enabled = 0; |
| |
| return 0; |
| } |
| |
| VLIB_INIT_FUNCTION (tcp_init); |
| |
| |
| static clib_error_t * |
| tcp_config_fn (vlib_main_t * vm, unformat_input_t * input) |
| { |
| tcp_main_t *tm = vnet_get_tcp_main (); |
| |
| while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) |
| { |
| if (unformat |
| (input, "preallocated-connections %d", |
| &tm->preallocated_connections)) |
| ; |
| else if (unformat (input, "preallocated-half-open-connections %d", |
| &tm->preallocated_half_open_connections)) |
| ; |
| else |
| return clib_error_return (0, "unknown input `%U'", |
| format_unformat_error, input); |
| } |
| return 0; |
| } |
| |
| VLIB_CONFIG_FUNCTION (tcp_config_fn, "tcp"); |
| |
| static clib_error_t * |
| tcp_src_address (vlib_main_t * vm, |
| unformat_input_t * input, vlib_cli_command_t * cmd_arg) |
| { |
| tcp_main_t *tm = vnet_get_tcp_main (); |
| ip4_address_t v4start, v4end; |
| ip6_address_t v6start, v6end; |
| int v4set = 0; |
| int v6set = 0; |
| |
| while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) |
| { |
| if (unformat (input, "%U - %U", unformat_ip4_address, &v4start, |
| unformat_ip4_address, &v4end)) |
| v4set = 1; |
| else if (unformat (input, "%U", unformat_ip4_address, &v4start)) |
| { |
| memcpy (&v4end, &v4start, sizeof (v4start)); |
| v4set = 1; |
| } |
| else if (unformat (input, "%U - %U", unformat_ip6_address, &v6start, |
| unformat_ip4_address, &v6end)) |
| v6set = 1; |
| else if (unformat (input, "%U", unformat_ip6_address, &v6start)) |
| { |
| memcpy (&v6end, &v6start, sizeof (v4start)); |
| v6set = 1; |
| } |
| else |
| break; |
| } |
| |
| if (!v4set && !v6set) |
| return clib_error_return (0, "at least one v4 or v6 address required"); |
| |
| if (v4set) |
| { |
| u32 tmp; |
| |
| do |
| { |
| vec_add1 (tm->ip4_src_addresses, v4start); |
| tmp = clib_net_to_host_u32 (v4start.as_u32); |
| tmp++; |
| v4start.as_u32 = clib_host_to_net_u32 (tmp); |
| } |
| while (clib_host_to_net_u32 (v4start.as_u32) <= |
| clib_host_to_net_u32 (v4end.as_u32)); |
| } |
| if (v6set) |
| { |
| clib_warning ("v6 src address list unimplemented..."); |
| } |
| return 0; |
| } |
| |
| /* *INDENT-OFF* */ |
| VLIB_CLI_COMMAND (tcp_src_address_command, static) = |
| { |
| .path = "tcp src-address", |
| .short_help = "tcp src-address <ip-addr> [- <ip-addr>] add src address range", |
| .function = tcp_src_address, |
| }; |
| /* *INDENT-ON* */ |
| |
| |
| |
| /* |
| * fd.io coding-style-patch-verification: ON |
| * |
| * Local Variables: |
| * eval: (c-set-style "gnu") |
| * End: |
| */ |