| /* |
| * 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. |
| */ |
| |
| /** |
| * @file |
| * @brief TCP host stack utilities |
| */ |
| |
| #include <vnet/tcp/tcp.h> |
| #include <vnet/session/session.h> |
| #include <vnet/fib/fib.h> |
| #include <vnet/dpo/load_balance.h> |
| #include <vnet/dpo/receive_dpo.h> |
| #include <vnet/ip/ip6_neighbor.h> |
| #include <math.h> |
| |
| tcp_main_t tcp_main; |
| |
| typedef struct |
| { |
| fib_protocol_t nh_proto; |
| vnet_link_t link_type; |
| ip46_address_t ip; |
| u32 sw_if_index; |
| u8 is_add; |
| } tcp_add_del_adj_args_t; |
| |
| static void |
| tcp_add_del_adj_cb (tcp_add_del_adj_args_t * args) |
| { |
| u32 ai; |
| if (args->is_add) |
| { |
| adj_nbr_add_or_lock (args->nh_proto, args->link_type, &args->ip, |
| args->sw_if_index); |
| } |
| else |
| { |
| ai = adj_nbr_find (FIB_PROTOCOL_IP6, VNET_LINK_IP6, &args->ip, |
| args->sw_if_index); |
| if (ai != ADJ_INDEX_INVALID) |
| adj_unlock (ai); |
| } |
| } |
| |
| static void |
| tcp_add_del_adjacency (tcp_connection_t * tc, u8 is_add) |
| { |
| tcp_add_del_adj_args_t args = { |
| .nh_proto = FIB_PROTOCOL_IP6, |
| .link_type = VNET_LINK_IP6, |
| .ip = tc->c_rmt_ip, |
| .sw_if_index = tc->sw_if_index, |
| .is_add = is_add |
| }; |
| vlib_rpc_call_main_thread (tcp_add_del_adj_cb, (u8 *) & args, |
| sizeof (args)); |
| } |
| |
| static u32 |
| tcp_connection_bind (u32 session_index, transport_endpoint_t * lcl) |
| { |
| tcp_main_t *tm = &tcp_main; |
| tcp_connection_t *listener; |
| void *iface_ip; |
| |
| pool_get (tm->listener_pool, listener); |
| memset (listener, 0, sizeof (*listener)); |
| |
| listener->c_c_index = listener - tm->listener_pool; |
| listener->c_lcl_port = lcl->port; |
| |
| /* If we are provided a sw_if_index, bind using one of its ips */ |
| if (ip_is_zero (&lcl->ip, 1) && lcl->sw_if_index != ENDPOINT_INVALID_INDEX) |
| { |
| if ((iface_ip = ip_interface_get_first_ip (lcl->sw_if_index, |
| lcl->is_ip4))) |
| ip_set (&lcl->ip, iface_ip, lcl->is_ip4); |
| } |
| ip_copy (&listener->c_lcl_ip, &lcl->ip, lcl->is_ip4); |
| listener->c_is_ip4 = lcl->is_ip4; |
| listener->c_proto = TRANSPORT_PROTO_TCP; |
| listener->c_s_index = session_index; |
| listener->c_fib_index = lcl->fib_index; |
| listener->state = TCP_STATE_LISTEN; |
| |
| tcp_connection_timers_init (listener); |
| |
| TCP_EVT_DBG (TCP_EVT_BIND, listener); |
| |
| return listener->c_c_index; |
| } |
| |
| static u32 |
| tcp_session_bind (u32 session_index, transport_endpoint_t * tep) |
| { |
| return tcp_connection_bind (session_index, tep); |
| } |
| |
| 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); |
| } |
| |
| static u32 |
| tcp_session_unbind (u32 listener_index) |
| { |
| tcp_connection_unbind (listener_index); |
| return 0; |
| } |
| |
| static 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; |
| } |
| |
| /** |
| * Cleanup half-open connection |
| * |
| */ |
| static void |
| tcp_half_open_connection_del (tcp_connection_t * tc) |
| { |
| tcp_main_t *tm = vnet_get_tcp_main (); |
| clib_spinlock_lock_if_init (&tm->half_open_lock); |
| pool_put_index (tm->half_open_connections, tc->c_c_index); |
| if (CLIB_DEBUG) |
| memset (tc, 0xFA, sizeof (*tc)); |
| clib_spinlock_unlock_if_init (&tm->half_open_lock); |
| } |
| |
| /** |
| * Try to cleanup half-open connection |
| * |
| * If called from a thread that doesn't own tc, the call won't have any |
| * effect. |
| * |
| * @param tc - connection to be cleaned up |
| * @return non-zero if cleanup failed. |
| */ |
| int |
| tcp_half_open_connection_cleanup (tcp_connection_t * tc) |
| { |
| /* Make sure this is the owning thread */ |
| if (tc->c_thread_index != vlib_get_thread_index ()) |
| return 1; |
| tcp_timer_reset (tc, TCP_TIMER_ESTABLISH); |
| tcp_timer_reset (tc, TCP_TIMER_RETRANSMIT_SYN); |
| tcp_half_open_connection_del (tc); |
| return 0; |
| } |
| |
| static tcp_connection_t * |
| tcp_half_open_connection_new (void) |
| { |
| tcp_main_t *tm = vnet_get_tcp_main (); |
| tcp_connection_t *tc = 0; |
| ASSERT (vlib_get_thread_index () == 0); |
| pool_get (tm->half_open_connections, tc); |
| memset (tc, 0, sizeof (*tc)); |
| tc->c_c_index = tc - tm->half_open_connections; |
| return tc; |
| } |
| |
| /** |
| * Cleans up connection state. |
| * |
| * No notifications. |
| */ |
| void |
| tcp_connection_cleanup (tcp_connection_t * tc) |
| { |
| tcp_main_t *tm = &tcp_main; |
| |
| /* Cleanup local endpoint if this was an active connect */ |
| transport_endpoint_cleanup (TRANSPORT_PROTO_TCP, &tc->c_lcl_ip, |
| tc->c_lcl_port); |
| |
| /* Check if connection is not yet fully established */ |
| if (tc->state == TCP_STATE_SYN_SENT) |
| { |
| /* Try to remove the half-open connection. If this is not the owning |
| * thread, tc won't be removed. Retransmit or establish timers will |
| * eventually expire and call again cleanup on the right thread. */ |
| if (tcp_half_open_connection_cleanup (tc)) |
| tc->flags |= TCP_CONN_HALF_OPEN_DONE; |
| } |
| else |
| { |
| int thread_index = tc->c_thread_index; |
| |
| /* Make sure all timers are cleared */ |
| tcp_connection_timers_reset (tc); |
| |
| if (!tc->c_is_ip4 && ip6_address_is_link_local_unicast (&tc->c_rmt_ip6)) |
| tcp_add_del_adjacency (tc, 0); |
| |
| /* 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); |
| } |
| |
| tcp_connection_t * |
| tcp_connection_new (u8 thread_index) |
| { |
| tcp_main_t *tm = vnet_get_tcp_main (); |
| tcp_connection_t *tc; |
| |
| pool_get (tm->connections[thread_index], tc); |
| memset (tc, 0, sizeof (*tc)); |
| tc->c_c_index = tc - tm->connections[thread_index]; |
| tc->c_thread_index = thread_index; |
| return 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) |
| { |
| TCP_EVT_DBG (TCP_EVT_RST_RCVD, 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: |
| session_stream_connect_notify (&tc->connection, 1 /* fail */ ); |
| tcp_connection_cleanup (tc); |
| break; |
| case TCP_STATE_ESTABLISHED: |
| tcp_connection_timers_reset (tc); |
| /* Set the cleanup timer, in case the session layer/app don't |
| * cleanly close the connection */ |
| tcp_timer_update (tc, TCP_TIMER_WAITCLOSE, TCP_CLEANUP_TIME); |
| stream_session_reset_notify (&tc->connection); |
| break; |
| 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; |
| TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc); |
| tcp_connection_timers_reset (tc); |
| tcp_timer_update (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/Program FIN if needed and switch state */ |
| switch (tc->state) |
| { |
| case TCP_STATE_SYN_SENT: |
| tc->state = TCP_STATE_CLOSED; |
| break; |
| case TCP_STATE_SYN_RCVD: |
| tcp_connection_timers_reset (tc); |
| tcp_send_fin (tc); |
| tc->state = TCP_STATE_FIN_WAIT_1; |
| tcp_timer_update (tc, TCP_TIMER_WAITCLOSE, TCP_CLEANUP_TIME); |
| break; |
| case TCP_STATE_ESTABLISHED: |
| if (!session_tx_fifo_max_dequeue (&tc->connection)) |
| tcp_send_fin (tc); |
| else |
| tc->flags |= TCP_CONN_FINPNDG; |
| tc->state = TCP_STATE_FIN_WAIT_1; |
| break; |
| case TCP_STATE_CLOSE_WAIT: |
| if (!session_tx_fifo_max_dequeue (&tc->connection)) |
| { |
| tcp_send_fin (tc); |
| tcp_connection_timers_reset (tc); |
| tc->state = TCP_STATE_LAST_ACK; |
| tcp_timer_update (tc, TCP_TIMER_WAITCLOSE, TCP_2MSL_TIME); |
| } |
| else |
| tc->flags |= TCP_CONN_FINPNDG; |
| break; |
| case TCP_STATE_FIN_WAIT_1: |
| tcp_timer_update (tc, TCP_TIMER_WAITCLOSE, TCP_2MSL_TIME); |
| break; |
| default: |
| TCP_DBG ("state: %u", tc->state); |
| } |
| |
| TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc); |
| |
| /* If in CLOSED and WAITCLOSE timer is not set, delete connection now */ |
| if (!tcp_timer_is_active (tc, TCP_TIMER_WAITCLOSE) |
| && tc->state == TCP_STATE_CLOSED) |
| tcp_connection_del (tc); |
| } |
| |
| static 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); |
| } |
| |
| static void |
| tcp_session_cleanup (u32 conn_index, u32 thread_index) |
| { |
| tcp_connection_t *tc; |
| tc = tcp_connection_get (conn_index, thread_index); |
| tcp_connection_timers_reset (tc); |
| tc->state = TCP_STATE_CLOSED; |
| TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc); |
| tcp_connection_cleanup (tc); |
| } |
| |
| /** |
| * 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; |
| u32 fib_index; |
| |
| 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; |
| fib_index = fib_table_find (prefix.fp_proto, tc->c_fib_index); |
| return fib_table_lookup (fib_index, &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 */ |
| |
| static void |
| tcp_cc_init (tcp_connection_t * tc) |
| { |
| tc->cc_algo = tcp_cc_algo_get (TCP_CC_NEWRENO); |
| tc->cc_algo->init (tc); |
| } |
| |
| 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; |
| } |
| |
| 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]; |
| } |
| |
| |
| /** |
| * Initialize connection send variables. |
| */ |
| void |
| tcp_init_snd_vars (tcp_connection_t * tc) |
| { |
| u32 time_now; |
| |
| /* |
| * We use the time to randomize iss and for setting up the initial |
| * timestamp. Make sure it's updated otherwise syn and ack in the |
| * handshake may make it look as if time has flown in the opposite |
| * direction for us. |
| */ |
| tcp_set_time_now (vlib_get_thread_index ()); |
| time_now = tcp_time_now (); |
| |
| tc->iss = random_u32 (&time_now); |
| tc->snd_una = tc->iss; |
| tc->snd_nxt = tc->iss + 1; |
| tc->snd_una_max = tc->snd_nxt; |
| } |
| |
| /** 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); |
| if (tc->state == TCP_STATE_SYN_RCVD) |
| tcp_init_snd_vars (tc); |
| |
| if (!tc->c_is_ip4 && ip6_address_is_link_local_unicast (&tc->c_rmt_ip6)) |
| tcp_add_del_adjacency (tc, 1); |
| |
| // tcp_connection_fib_attach (tc); |
| } |
| |
| static int |
| tcp_alloc_custom_local_endpoint (tcp_main_t * tm, ip46_address_t * lcl_addr, |
| u16 * lcl_port, u8 is_ip4) |
| { |
| int index, port; |
| if (is_ip4) |
| { |
| 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 |
| { |
| 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_address_t)); |
| } |
| port = transport_alloc_local_port (TRANSPORT_PROTO_TCP, lcl_addr); |
| if (port < 1) |
| { |
| clib_warning ("Failed to allocate src port"); |
| return -1; |
| } |
| *lcl_port = port; |
| return 0; |
| } |
| |
| static int |
| tcp_connection_open (transport_endpoint_t * rmt) |
| { |
| tcp_main_t *tm = vnet_get_tcp_main (); |
| tcp_connection_t *tc; |
| ip46_address_t lcl_addr; |
| u16 lcl_port; |
| int rv; |
| |
| /* |
| * Allocate local endpoint |
| */ |
| if ((rmt->is_ip4 && vec_len (tm->ip4_src_addresses)) |
| || (!rmt->is_ip4 && vec_len (tm->ip6_src_addresses))) |
| rv = tcp_alloc_custom_local_endpoint (tm, &lcl_addr, &lcl_port, |
| rmt->is_ip4); |
| else |
| rv = transport_alloc_local_endpoint (TRANSPORT_PROTO_TCP, |
| rmt, &lcl_addr, &lcl_port); |
| |
| if (rv) |
| return -1; |
| |
| /* |
| * Create connection and send SYN |
| */ |
| clib_spinlock_lock_if_init (&tm->half_open_lock); |
| tc = tcp_half_open_connection_new (); |
| ip_copy (&tc->c_rmt_ip, &rmt->ip, rmt->is_ip4); |
| ip_copy (&tc->c_lcl_ip, &lcl_addr, rmt->is_ip4); |
| tc->c_rmt_port = rmt->port; |
| tc->c_lcl_port = clib_host_to_net_u16 (lcl_port); |
| tc->c_is_ip4 = rmt->is_ip4; |
| tc->c_proto = TRANSPORT_PROTO_TCP; |
| tc->c_fib_index = rmt->fib_index; |
| /* The other connection vars will be initialized after SYN ACK */ |
| tcp_connection_timers_init (tc); |
| |
| TCP_EVT_DBG (TCP_EVT_OPEN, tc); |
| tc->state = TCP_STATE_SYN_SENT; |
| tcp_init_snd_vars (tc); |
| tcp_send_syn (tc); |
| clib_spinlock_unlock_if_init (&tm->half_open_lock); |
| |
| return tc->c_c_index; |
| } |
| |
| static int |
| tcp_session_open (transport_endpoint_t * tep) |
| { |
| return tcp_connection_open (tep); |
| } |
| |
| 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_connection_flags_str[] = { |
| #define _(sym, str) str, |
| foreach_tcp_connection_flag |
| #undef _ |
| }; |
| |
| static u8 * |
| format_tcp_connection_flags (u8 * s, va_list * args) |
| { |
| tcp_connection_t *tc = va_arg (*args, tcp_connection_t *); |
| int i, last = -1; |
| |
| for (i = 0; i < TCP_CONN_N_FLAG_BITS; i++) |
| if (tc->flags & (1 << i)) |
| last = i; |
| for (i = 0; i < last; i++) |
| { |
| if (tc->flags & (1 << i)) |
| s = format (s, "%s, ", tcp_connection_flags_str[i]); |
| } |
| if (last >= 0) |
| s = format (s, "%s", tcp_connection_flags_str[last]); |
| return s; |
| } |
| |
| const char *tcp_conn_timers[] = { |
| #define _(sym, str) str, |
| foreach_tcp_timer |
| #undef _ |
| }; |
| |
| static 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; |
| } |
| |
| static 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; |
| } |
| |
| static i32 |
| tcp_rcv_wnd_available (tcp_connection_t * tc) |
| { |
| return (i32) tc->rcv_wnd - (tc->rcv_nxt - tc->rcv_las); |
| } |
| |
| static u8 * |
| format_tcp_vars (u8 * s, va_list * args) |
| { |
| tcp_connection_t *tc = va_arg (*args, tcp_connection_t *); |
| s = format (s, " flags: %U timers: %U\n", format_tcp_connection_flags, tc, |
| format_tcp_timers, tc); |
| 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 rcv_wscale %u ", |
| tc->snd_wnd, tc->rcv_wnd, tc->rcv_wscale); |
| s = format (s, "snd_wl1 %u snd_wl2 %u\n", tc->snd_wl1 - tc->irs, |
| tc->snd_wl2 - tc->iss); |
| s = format (s, " flight size %u out space %u cc space %u rcv_wnd_av %u\n", |
| tcp_flight_size (tc), tcp_available_output_snd_space (tc), |
| tcp_available_cc_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); |
| if (tc->state >= TCP_STATE_ESTABLISHED) |
| s = format (s, " scoreboard: %U\n", format_tcp_scoreboard, &tc->sack_sb, |
| tc); |
| if (vec_len (tc->snd_sacks)) |
| s = format (s, " sacks tx: %U\n", format_tcp_sacks, tc); |
| |
| return s; |
| } |
| |
| static 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); |
| |
| if (!tc) |
| return s; |
| 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, "\n%U", format_tcp_vars, tc); |
| } |
| |
| return s; |
| } |
| |
| static 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\n"); |
| return s; |
| } |
| |
| static 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); |
| } |
| |
| static 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_rcv_sacks (u8 * s, va_list * args) |
| { |
| tcp_connection_t *tc = va_arg (*args, tcp_connection_t *); |
| sack_block_t *sacks = tc->rcv_opts.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->iss, |
| block->end - tc->iss); |
| } |
| if (len) |
| { |
| block = &sacks[len - 1]; |
| s = format (s, " start %u end %u", block->start - tc->iss, |
| block->end - tc->iss); |
| } |
| return s; |
| } |
| |
| static u8 * |
| format_tcp_sack_hole (u8 * s, va_list * args) |
| { |
| sack_scoreboard_hole_t *hole = va_arg (*args, sack_scoreboard_hole_t *); |
| tcp_connection_t *tc = va_arg (*args, tcp_connection_t *); |
| if (tc) |
| s = format (s, " [%u, %u]", hole->start - tc->iss, hole->end - tc->iss); |
| else |
| 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 *); |
| tcp_connection_t *tc = va_arg (*args, tcp_connection_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 - tc->iss, |
| sb->snd_una_adv); |
| s = format (s, " cur_rxt_hole %u high_rxt %u rescue_rxt %u", |
| sb->cur_rxt_hole, sb->high_rxt - tc->iss, |
| sb->rescue_rxt - tc->iss); |
| |
| 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, tc); |
| hole = scoreboard_next_hole (sb, hole); |
| } |
| |
| return s; |
| } |
| |
| static 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; |
| } |
| |
| static 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. |
| */ |
| static 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_burst_snd_vars (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 not snd_wnd constrained and we can't write at least a segment, |
| * don't try at all */ |
| if (PREDICT_FALSE (snd_space < tc->snd_mss)) |
| return snd_space < tc->cwnd ? 0 : snd_space; |
| |
| /* 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 |
| */ |
| static inline u32 |
| tcp_snd_space_inline (tcp_connection_t * tc) |
| { |
| int snd_space, snt_limited; |
| |
| if (PREDICT_TRUE (tcp_in_cong_recovery (tc) == 0)) |
| { |
| snd_space = tcp_available_output_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_snd_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); |
| } |
| |
| /* RFC 5681: When previously unsent data is available and the new value of |
| * cwnd and the receiver's advertised window allow, a TCP SHOULD send 1*SMSS |
| * bytes of previously unsent data. */ |
| if (tcp_in_fastrecovery (tc) && !tcp_fastrecovery_sent_1_smss (tc)) |
| { |
| if (tcp_available_cc_snd_space (tc) < tc->snd_mss) |
| return 0; |
| tcp_fastrecovery_1_smss_on (tc); |
| return tc->snd_mss; |
| } |
| |
| return 0; |
| } |
| |
| u32 |
| tcp_snd_space (tcp_connection_t * tc) |
| { |
| return tcp_snd_space_inline (tc); |
| } |
| |
| static u32 |
| tcp_session_send_space (transport_connection_t * trans_conn) |
| { |
| tcp_connection_t *tc = (tcp_connection_t *) trans_conn; |
| return clib_min (tcp_snd_space_inline (tc), |
| tc->snd_wnd - (tc->snd_nxt - tc->snd_una)); |
| } |
| |
| static 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); |
| } |
| |
| static void |
| tcp_update_time (f64 now, u8 thread_index) |
| { |
| tcp_set_time_now (thread_index); |
| tw_timer_expire_timers_16t_2w_512sl (&tcp_main. |
| wrk_ctx[thread_index].timer_wheel, |
| now); |
| tcp_flush_frames_to_output (thread_index); |
| } |
| |
| static u32 |
| tcp_session_push_header (transport_connection_t * tconn, vlib_buffer_t * b) |
| { |
| tcp_connection_t *tc = (tcp_connection_t *) tconn; |
| return tcp_push_header (tc, b); |
| } |
| |
| /* *INDENT-OFF* */ |
| const static transport_proto_vft_t tcp_proto = { |
| .enable = vnet_tcp_enable_disable, |
| .bind = tcp_session_bind, |
| .unbind = tcp_session_unbind, |
| .push_header = tcp_session_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, |
| .close = tcp_session_close, |
| .cleanup = tcp_session_cleanup, |
| .send_mss = tcp_session_send_mss, |
| .send_space = tcp_session_send_space, |
| .update_time = tcp_update_time, |
| .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, |
| .tx_type = TRANSPORT_TX_PEEK, |
| .service_type = TRANSPORT_SERVICE_VC, |
| }; |
| /* *INDENT-ON* */ |
| |
| static 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); |
| } |
| |
| static void |
| tcp_timer_establish_handler (u32 conn_index) |
| { |
| tcp_connection_t *tc; |
| |
| tc = tcp_half_open_connection_get (conn_index); |
| if (tc) |
| { |
| ASSERT (tc->state == TCP_STATE_SYN_SENT); |
| session_stream_connect_notify (&tc->connection, 1 /* fail */ ); |
| TCP_DBG ("establish pop: %U", format_tcp_connection, tc, 2); |
| } |
| else |
| { |
| tc = tcp_connection_get (conn_index, vlib_get_thread_index ()); |
| /* note: the connection may have already disappeared */ |
| if (PREDICT_FALSE (tc == 0)) |
| return; |
| TCP_DBG ("establish pop: %U", format_tcp_connection, tc, 2); |
| ASSERT (tc->state == TCP_STATE_SYN_RCVD); |
| /* Start cleanup. App wasn't notified yet so use delete notify as |
| * opposed to delete to cleanup session layer state. */ |
| stream_session_delete_notify (&tc->connection); |
| } |
| tc->timers[TCP_TIMER_ESTABLISH] = TCP_TIMER_HANDLE_INVALID; |
| tcp_connection_cleanup (tc); |
| } |
| |
| static 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); |
| if (!tc) |
| return; |
| 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!"); |
| } |
| |
| /* Make sure we don't try to send unsent data */ |
| tcp_connection_timers_reset (tc); |
| tcp_cong_recovery_off (tc); |
| tc->snd_una_max = tc->snd_nxt = tc->snd_una; |
| 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); |
| } |
| } |
| |
| static void |
| tcp_initialize_timer_wheels (tcp_main_t * tm) |
| { |
| tw_timer_wheel_16t_2w_512sl_t *tw; |
| /* *INDENT-OFF* */ |
| foreach_vlib_main (({ |
| tw = &tm->wrk_ctx[ii].timer_wheel; |
| 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* */ |
| } |
| |
| static clib_error_t * |
| tcp_main_enable (vlib_main_t * vm) |
| { |
| tcp_main_t *tm = vnet_get_tcp_main (); |
| vlib_thread_main_t *vtm = vlib_get_thread_main (); |
| clib_error_t *error = 0; |
| u32 num_threads; |
| int thread; |
| tcp_connection_t *tc __attribute__ ((unused)); |
| u32 preallocated_connections_per_thread; |
| |
| 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 |
| */ |
| |
| ip4_register_protocol (IP_PROTOCOL_TCP, tcp4_input_node.index); |
| ip6_register_protocol (IP_PROTOCOL_TCP, tcp6_input_node.index); |
| |
| /* |
| * Initialize data structures |
| */ |
| |
| num_threads = 1 /* main thread */ + vtm->n_threads; |
| vec_validate (tm->connections, num_threads - 1); |
| |
| /* |
| * Preallocate connections. Assume that thread 0 won't |
| * use preallocated threads when running multi-core |
| */ |
| if (num_threads == 1) |
| { |
| thread = 0; |
| preallocated_connections_per_thread = tm->preallocated_connections; |
| } |
| else |
| { |
| thread = 1; |
| preallocated_connections_per_thread = |
| tm->preallocated_connections / (num_threads - 1); |
| } |
| for (; thread < num_threads; thread++) |
| { |
| if (preallocated_connections_per_thread) |
| pool_init_fixed (tm->connections[thread], |
| preallocated_connections_per_thread); |
| } |
| |
| /* |
| * Use a preallocated half-open connection pool? |
| */ |
| if (tm->preallocated_half_open_connections) |
| pool_init_fixed (tm->half_open_connections, |
| tm->preallocated_half_open_connections); |
| |
| /* 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; |
| |
| if (num_threads > 1) |
| { |
| clib_spinlock_init (&tm->half_open_lock); |
| } |
| |
| vec_validate (tm->wrk_ctx, num_threads - 1); |
| tcp_initialize_timer_wheels (tm); |
| |
| tm->bytes_per_buffer = vlib_buffer_free_list_buffer_size |
| (vm, VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX); |
| |
| 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; |
| } |
| |
| void |
| tcp_punt_unknown (vlib_main_t * vm, u8 is_ip4, u8 is_add) |
| { |
| tcp_main_t *tm = &tcp_main; |
| if (is_ip4) |
| tm->punt_unknown4 = is_add; |
| else |
| tm->punt_unknown6 = is_add; |
| } |
| |
| static clib_error_t * |
| tcp_init (vlib_main_t * vm) |
| { |
| tcp_main_t *tm = vnet_get_tcp_main (); |
| ip_main_t *im = &ip_main; |
| ip_protocol_info_t *pi; |
| |
| /* Session layer, and by implication tcp, are disabled by default */ |
| tm->is_enabled = 0; |
| |
| /* Register with IP for header parsing */ |
| 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; |
| |
| /* Register as transport with session layer */ |
| transport_register_protocol (TRANSPORT_PROTO_TCP, &tcp_proto, |
| FIB_PROTOCOL_IP4, tcp4_output_node.index); |
| transport_register_protocol (TRANSPORT_PROTO_TCP, &tcp_proto, |
| FIB_PROTOCOL_IP6, tcp6_output_node.index); |
| |
| tcp_api_reference (); |
| 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 if (unformat (input, "buffer-fail-fraction %f", |
| &tm->buffer_fail_fraction)) |
| ; |
| else if (unformat (input, "max-rx-fifo %U", unformat_memory_size, |
| &tm->max_rx_fifo)) |
| ; |
| else |
| return clib_error_return (0, "unknown input `%U'", |
| format_unformat_error, input); |
| } |
| return 0; |
| } |
| |
| VLIB_CONFIG_FUNCTION (tcp_config_fn, "tcp"); |
| |
| |
| /** |
| * \brief Configure an ipv4 source address range |
| * @param vm vlib_main_t pointer |
| * @param start first ipv4 address in the source address range |
| * @param end last ipv4 address in the source address range |
| * @param table_id VRF / table ID, 0 for the default FIB |
| * @return 0 if all OK, else an error indication from api_errno.h |
| */ |
| |
| int |
| tcp_configure_v4_source_address_range (vlib_main_t * vm, |
| ip4_address_t * start, |
| ip4_address_t * end, u32 table_id) |
| { |
| tcp_main_t *tm = vnet_get_tcp_main (); |
| vnet_main_t *vnm = vnet_get_main (); |
| u32 start_host_byte_order, end_host_byte_order; |
| fib_prefix_t prefix; |
| vnet_sw_interface_t *si; |
| fib_node_index_t fei; |
| u32 fib_index = 0; |
| u32 sw_if_index; |
| int rv; |
| int vnet_proxy_arp_add_del (ip4_address_t * lo_addr, |
| ip4_address_t * hi_addr, u32 fib_index, |
| int is_del); |
| |
| memset (&prefix, 0, sizeof (prefix)); |
| |
| fib_index = fib_table_find (FIB_PROTOCOL_IP4, table_id); |
| |
| if (fib_index == ~0) |
| return VNET_API_ERROR_NO_SUCH_FIB; |
| |
| start_host_byte_order = clib_net_to_host_u32 (start->as_u32); |
| end_host_byte_order = clib_net_to_host_u32 (end->as_u32); |
| |
| /* sanity check for reversed args or some such */ |
| if ((end_host_byte_order - start_host_byte_order) > (10 << 10)) |
| return VNET_API_ERROR_INVALID_ARGUMENT; |
| |
| /* Lookup the last address, to identify the interface involved */ |
| prefix.fp_len = 32; |
| prefix.fp_proto = FIB_PROTOCOL_IP4; |
| memcpy (&prefix.fp_addr.ip4, end, sizeof (ip4_address_t)); |
| |
| fei = fib_table_lookup (fib_index, &prefix); |
| |
| /* Couldn't find route to destination. Bail out. */ |
| if (fei == FIB_NODE_INDEX_INVALID) |
| return VNET_API_ERROR_NEXT_HOP_NOT_IN_FIB; |
| |
| sw_if_index = fib_entry_get_resolving_interface (fei); |
| |
| /* Enable proxy arp on the interface */ |
| si = vnet_get_sw_interface (vnm, sw_if_index); |
| si->flags |= VNET_SW_INTERFACE_FLAG_PROXY_ARP; |
| |
| /* Configure proxy arp across the range */ |
| rv = vnet_proxy_arp_add_del (start, end, fib_index, 0 /* is_del */ ); |
| |
| if (rv) |
| return rv; |
| |
| do |
| { |
| dpo_id_t dpo = DPO_INVALID; |
| |
| vec_add1 (tm->ip4_src_addresses, start[0]); |
| |
| /* Add local adjacencies for the range */ |
| |
| receive_dpo_add_or_lock (DPO_PROTO_IP4, ~0 /* sw_if_index */ , |
| NULL, &dpo); |
| prefix.fp_len = 32; |
| prefix.fp_proto = FIB_PROTOCOL_IP4; |
| prefix.fp_addr.ip4.as_u32 = start->as_u32; |
| |
| fib_table_entry_special_dpo_update (fib_index, |
| &prefix, |
| FIB_SOURCE_API, |
| FIB_ENTRY_FLAG_EXCLUSIVE, &dpo); |
| dpo_reset (&dpo); |
| |
| start_host_byte_order++; |
| start->as_u32 = clib_host_to_net_u32 (start_host_byte_order); |
| } |
| while (start_host_byte_order <= end_host_byte_order); |
| |
| return 0; |
| } |
| |
| /** |
| * \brief Configure an ipv6 source address range |
| * @param vm vlib_main_t pointer |
| * @param start first ipv6 address in the source address range |
| * @param end last ipv6 address in the source address range |
| * @param table_id VRF / table ID, 0 for the default FIB |
| * @return 0 if all OK, else an error indication from api_errno.h |
| */ |
| |
| int |
| tcp_configure_v6_source_address_range (vlib_main_t * vm, |
| ip6_address_t * start, |
| ip6_address_t * end, u32 table_id) |
| { |
| tcp_main_t *tm = vnet_get_tcp_main (); |
| fib_prefix_t prefix; |
| u32 fib_index = 0; |
| fib_node_index_t fei; |
| u32 sw_if_index; |
| |
| memset (&prefix, 0, sizeof (prefix)); |
| |
| fib_index = fib_table_find (FIB_PROTOCOL_IP6, table_id); |
| |
| if (fib_index == ~0) |
| return VNET_API_ERROR_NO_SUCH_FIB; |
| |
| while (1) |
| { |
| int i; |
| ip6_address_t tmp; |
| dpo_id_t dpo = DPO_INVALID; |
| |
| /* Remember this address */ |
| vec_add1 (tm->ip6_src_addresses, start[0]); |
| |
| /* Lookup the prefix, to identify the interface involved */ |
| prefix.fp_len = 128; |
| prefix.fp_proto = FIB_PROTOCOL_IP6; |
| memcpy (&prefix.fp_addr.ip6, start, sizeof (ip6_address_t)); |
| |
| fei = fib_table_lookup (fib_index, &prefix); |
| |
| /* Couldn't find route to destination. Bail out. */ |
| if (fei == FIB_NODE_INDEX_INVALID) |
| return VNET_API_ERROR_NEXT_HOP_NOT_IN_FIB; |
| |
| sw_if_index = fib_entry_get_resolving_interface (fei); |
| |
| if (sw_if_index == (u32) ~ 0) |
| return VNET_API_ERROR_NO_MATCHING_INTERFACE; |
| |
| /* Add a proxy neighbor discovery entry for this address */ |
| ip6_neighbor_proxy_add_del (sw_if_index, start, 0 /* is_del */ ); |
| |
| /* Add a receive adjacency for this address */ |
| receive_dpo_add_or_lock (DPO_PROTO_IP6, ~0 /* sw_if_index */ , |
| NULL, &dpo); |
| |
| fib_table_entry_special_dpo_update (fib_index, |
| &prefix, |
| FIB_SOURCE_API, |
| FIB_ENTRY_FLAG_EXCLUSIVE, &dpo); |
| dpo_reset (&dpo); |
| |
| /* Done with the entire range? */ |
| if (!memcmp (start, end, sizeof (start[0]))) |
| break; |
| |
| /* Increment the address. DGMS. */ |
| tmp = start[0]; |
| for (i = 15; i >= 0; i--) |
| { |
| tmp.as_u8[i] += 1; |
| if (tmp.as_u8[i] != 0) |
| break; |
| } |
| start[0] = tmp; |
| } |
| return 0; |
| } |
| |
| static clib_error_t * |
| tcp_src_address (vlib_main_t * vm, |
| unformat_input_t * input, vlib_cli_command_t * cmd_arg) |
| { |
| ip4_address_t v4start, v4end; |
| ip6_address_t v6start, v6end; |
| u32 table_id = 0; |
| int v4set = 0; |
| int v6set = 0; |
| int rv; |
| |
| 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_ip6_address, &v6end)) |
| v6set = 1; |
| else if (unformat (input, "%U", unformat_ip6_address, &v6start)) |
| { |
| memcpy (&v6end, &v6start, sizeof (v6start)); |
| v6set = 1; |
| } |
| else if (unformat (input, "fib-table %d", &table_id)) |
| ; |
| else |
| break; |
| } |
| |
| if (!v4set && !v6set) |
| return clib_error_return (0, "at least one v4 or v6 address required"); |
| |
| if (v4set) |
| { |
| rv = tcp_configure_v4_source_address_range (vm, &v4start, &v4end, |
| table_id); |
| switch (rv) |
| { |
| case 0: |
| break; |
| |
| case VNET_API_ERROR_NO_SUCH_FIB: |
| return clib_error_return (0, "Invalid table-id %d", table_id); |
| |
| case VNET_API_ERROR_INVALID_ARGUMENT: |
| return clib_error_return (0, "Invalid address range %U - %U", |
| format_ip4_address, &v4start, |
| format_ip4_address, &v4end); |
| default: |
| return clib_error_return (0, "error %d", rv); |
| break; |
| } |
| } |
| if (v6set) |
| { |
| rv = tcp_configure_v6_source_address_range (vm, &v6start, &v6end, |
| table_id); |
| switch (rv) |
| { |
| case 0: |
| break; |
| |
| case VNET_API_ERROR_NO_SUCH_FIB: |
| return clib_error_return (0, "Invalid table-id %d", table_id); |
| |
| default: |
| return clib_error_return (0, "error %d", rv); |
| break; |
| } |
| } |
| 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* */ |
| |
| static u8 * |
| tcp_scoreboard_dump_trace (u8 * s, sack_scoreboard_t * sb) |
| { |
| #if TCP_SCOREBOARD_TRACE |
| |
| scoreboard_trace_elt_t *block; |
| int i = 0; |
| |
| if (!sb->trace) |
| return s; |
| |
| s = format (s, "scoreboard trace:"); |
| vec_foreach (block, sb->trace) |
| { |
| s = format (s, "{%u, %u, %u, %u, %u}, ", block->start, block->end, |
| block->ack, block->snd_una_max, block->group); |
| if ((++i % 3) == 0) |
| s = format (s, "\n"); |
| } |
| return s; |
| #else |
| return 0; |
| #endif |
| } |
| |
| static clib_error_t * |
| tcp_show_scoreboard_trace_fn (vlib_main_t * vm, unformat_input_t * input, |
| vlib_cli_command_t * cmd_arg) |
| { |
| transport_connection_t *tconn = 0; |
| tcp_connection_t *tc; |
| u8 *s = 0; |
| while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) |
| { |
| if (unformat (input, "%U", unformat_transport_connection, &tconn, |
| TRANSPORT_PROTO_TCP)) |
| ; |
| else |
| return clib_error_return (0, "unknown input `%U'", |
| format_unformat_error, input); |
| } |
| |
| if (!TCP_SCOREBOARD_TRACE) |
| { |
| vlib_cli_output (vm, "scoreboard tracing not enabled"); |
| return 0; |
| } |
| |
| tc = tcp_get_connection_from_transport (tconn); |
| s = tcp_scoreboard_dump_trace (s, &tc->sack_sb); |
| vlib_cli_output (vm, "%v", s); |
| return 0; |
| } |
| |
| /* *INDENT-OFF* */ |
| VLIB_CLI_COMMAND (tcp_show_scoreboard_trace_command, static) = |
| { |
| .path = "show tcp scoreboard trace", |
| .short_help = "show tcp scoreboard trace <connection>", |
| .function = tcp_show_scoreboard_trace_fn, |
| }; |
| /* *INDENT-ON* */ |
| |
| u8 * |
| tcp_scoreboard_replay (u8 * s, tcp_connection_t * tc, u8 verbose) |
| { |
| int i, trace_len; |
| scoreboard_trace_elt_t *trace; |
| u32 next_ack, left, group, has_new_ack = 0; |
| tcp_connection_t _dummy_tc, *dummy_tc = &_dummy_tc; |
| sack_block_t *block; |
| |
| if (!tc) |
| return s; |
| |
| memset (dummy_tc, 0, sizeof (*dummy_tc)); |
| tcp_connection_timers_init (dummy_tc); |
| scoreboard_init (&dummy_tc->sack_sb); |
| dummy_tc->rcv_opts.flags |= TCP_OPTS_FLAG_SACK; |
| |
| #if TCP_SCOREBOARD_TRACE |
| trace = tc->sack_sb.trace; |
| trace_len = vec_len (tc->sack_sb.trace); |
| #else |
| trace = 0; |
| trace_len = 0; |
| #endif |
| |
| for (i = 0; i < trace_len; i++) |
| { |
| if (trace[i].ack != 0) |
| { |
| dummy_tc->snd_una = trace[i].ack - 1448; |
| dummy_tc->snd_una_max = trace[i].ack; |
| } |
| } |
| |
| left = 0; |
| while (left < trace_len) |
| { |
| group = trace[left].group; |
| vec_reset_length (dummy_tc->rcv_opts.sacks); |
| has_new_ack = 0; |
| while (trace[left].group == group) |
| { |
| if (trace[left].ack != 0) |
| { |
| if (verbose) |
| s = format (s, "Adding ack %u, snd_una_max %u, segs: ", |
| trace[left].ack, trace[left].snd_una_max); |
| dummy_tc->snd_una_max = trace[left].snd_una_max; |
| next_ack = trace[left].ack; |
| has_new_ack = 1; |
| } |
| else |
| { |
| if (verbose) |
| s = format (s, "[%u, %u], ", trace[left].start, |
| trace[left].end); |
| vec_add2 (dummy_tc->rcv_opts.sacks, block, 1); |
| block->start = trace[left].start; |
| block->end = trace[left].end; |
| } |
| left++; |
| } |
| |
| /* Push segments */ |
| tcp_rcv_sacks (dummy_tc, next_ack); |
| if (has_new_ack) |
| dummy_tc->snd_una = next_ack + dummy_tc->sack_sb.snd_una_adv; |
| |
| if (verbose) |
| s = format (s, "result: %U", format_tcp_scoreboard, |
| &dummy_tc->sack_sb); |
| |
| } |
| s = format (s, "result: %U", format_tcp_scoreboard, &dummy_tc->sack_sb); |
| |
| return s; |
| } |
| |
| static clib_error_t * |
| tcp_scoreboard_trace_fn (vlib_main_t * vm, unformat_input_t * input, |
| vlib_cli_command_t * cmd_arg) |
| { |
| transport_connection_t *tconn = 0; |
| tcp_connection_t *tc = 0; |
| u8 *str = 0; |
| while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) |
| { |
| if (unformat (input, "%U", unformat_transport_connection, &tconn, |
| TRANSPORT_PROTO_TCP)) |
| ; |
| else |
| return clib_error_return (0, "unknown input `%U'", |
| format_unformat_error, input); |
| } |
| |
| if (!TCP_SCOREBOARD_TRACE) |
| { |
| vlib_cli_output (vm, "scoreboard tracing not enabled"); |
| return 0; |
| } |
| |
| tc = tcp_get_connection_from_transport (tconn); |
| if (!tc) |
| { |
| vlib_cli_output (vm, "connection not found"); |
| return 0; |
| } |
| str = tcp_scoreboard_replay (str, tc, 1); |
| vlib_cli_output (vm, "%v", str); |
| return 0; |
| } |
| |
| /* *INDENT-OFF* */ |
| VLIB_CLI_COMMAND (tcp_replay_scoreboard_command, static) = |
| { |
| .path = "tcp replay scoreboard", |
| .short_help = "tcp replay scoreboard <connection>", |
| .function = tcp_scoreboard_trace_fn, |
| }; |
| /* *INDENT-ON* */ |
| |
| static clib_error_t * |
| show_tcp_punt_fn (vlib_main_t * vm, unformat_input_t * input, |
| vlib_cli_command_t * cmd_arg) |
| { |
| tcp_main_t *tm = vnet_get_tcp_main (); |
| if (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) |
| return clib_error_return (0, "unknown input `%U'", format_unformat_error, |
| input); |
| vlib_cli_output (vm, "IPv4 TCP punt: %s", |
| tm->punt_unknown4 ? "enabled" : "disabled"); |
| vlib_cli_output (vm, "IPv6 TCP punt: %s", |
| tm->punt_unknown6 ? "enabled" : "disabled"); |
| return 0; |
| } |
| /* *INDENT-OFF* */ |
| VLIB_CLI_COMMAND (show_tcp_punt_command, static) = |
| { |
| .path = "show tcp punt", |
| .short_help = "show tcp punt", |
| .function = show_tcp_punt_fn, |
| }; |
| /* *INDENT-ON* */ |
| |
| /* |
| * fd.io coding-style-patch-verification: ON |
| * |
| * Local Variables: |
| * eval: (c-set-style "gnu") |
| * End: |
| */ |