/*
- * Copyright (c) 2016 Cisco and/or its affiliates.
+ * Copyright (c) 2016-2019 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:
* limitations under the License.
*/
+/**
+ * @file
+ * @brief TCP host stack utilities
+ */
+
#include <vnet/tcp/tcp.h>
+#include <vnet/tcp/tcp_inlines.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;
+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 void
+tcp_cc_init (tcp_connection_t * tc)
+{
+ tc->cc_algo->init (tc);
+}
+
+static void
+tcp_cc_cleanup (tcp_connection_t * tc)
+{
+ if (tc->cc_algo->cleanup)
+ tc->cc_algo->cleanup (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;
+ hash_set_mem (tm->cc_algo_by_name, vft->name, type);
+}
+
+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];
+}
+
+tcp_cc_algorithm_type_e
+tcp_cc_algo_new_type (const tcp_cc_algorithm_t * vft)
+{
+ tcp_main_t *tm = vnet_get_tcp_main ();
+ tcp_cc_algo_register (++tm->cc_last_type, vft);
+ return tm->cc_last_type;
+}
+
static u32
-tcp_connection_bind (u32 session_index, ip46_address_t * ip,
- u16 port_host_byte_order, u8 is_ip4)
+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));
+ clib_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;
- else
- clib_memcpy (&listener->c_lcl_ip6, &ip->ip6, sizeof (ip6_address_t));
+ 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_proto = SESSION_TYPE_IP4_TCP;
+ listener->c_fib_index = lcl->fib_index;
listener->state = TCP_STATE_LISTEN;
- listener->c_is_ip4 = 1;
+ listener->cc_algo = tcp_cc_algo_get (tcp_cfg.cc_algo);
tcp_connection_timers_init (listener);
- TCP_EVT_DBG (TCP_EVT_BIND, listener);
+ TCP_EVT (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)
+static u32
+tcp_session_bind (u32 session_index, transport_endpoint_t * tep)
{
- return tcp_connection_bind (session_index, ip, port_host_byte_order, 0);
-
+ return tcp_connection_bind (session_index, tep);
}
static void
tcp_connection_unbind (u32 listener_index)
{
tcp_main_t *tm = vnet_get_tcp_main ();
- TCP_EVT_DBG (TCP_EVT_UNBIND,
- pool_elt_at_index (tm->listener_pool, listener_index));
+ tcp_connection_t *tc;
+
+ tc = pool_elt_at_index (tm->listener_pool, listener_index);
+
+ TCP_EVT (TCP_EVT_UNBIND, tc);
+
+ /* Poison the entry */
+ if (CLIB_DEBUG > 0)
+ clib_memset (tc, 0xFA, sizeof (*tc));
+
pool_put_index (tm->listener_pool, listener_index);
}
-u32
+static u32
tcp_session_unbind (u32 listener_index)
{
tcp_connection_unbind (listener_index);
return 0;
}
-transport_connection_t *
+static transport_connection_t *
tcp_session_get_listener (u32 listener_index)
{
tcp_main_t *tm = vnet_get_tcp_main ();
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);
+ if (CLIB_DEBUG)
+ clib_memset (tc, 0xFA, sizeof (*tc));
+ pool_put (tm->half_open_connections, 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)
+{
+ tcp_worker_ctx_t *wrk;
+
+ /* Make sure this is the owning thread */
+ if (tc->c_thread_index != vlib_get_thread_index ())
+ return 1;
+
+ wrk = tcp_get_worker (tc->c_thread_index);
+ tcp_timer_reset (&wrk->timer_wheel, 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);
+ clib_memset (tc, 0, sizeof (*tc));
+ tc->c_c_index = tc - tm->half_open_connections;
+ return tc;
+}
+
/**
* Cleans up connection state.
*
void
tcp_connection_cleanup (tcp_connection_t * tc)
{
- tcp_main_t *tm = &tcp_main;
- u32 tepi;
- transport_endpoint_t *tep;
+ TCP_EVT (TCP_EVT_DELETE, tc);
/* 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);
+ if (!(tc->cfg_flags & TCP_CFG_F_NO_ENDPOINT))
+ transport_endpoint_cleanup (TRANSPORT_PROTO_TCP, &tc->c_lcl_ip,
+ tc->c_lcl_port);
- /*XXX lock */
- if (tepi != TRANSPORT_ENDPOINT_INVALID_INDEX)
+ /* Check if connection is not yet fully established */
+ if (tc->state == TCP_STATE_SYN_SENT)
{
- tep = pool_elt_at_index (tm->local_endpoints, tepi);
- transport_endpoint_table_del (&tm->local_endpoints_table, tep);
- pool_put (tm->local_endpoints, tep);
+ /* 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
+ {
+ /* Make sure all timers are cleared */
+ tcp_connection_timers_reset (tc);
- /* 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);
- /* Check if half-open */
- if (tc->state == TCP_STATE_SYN_SENT)
- pool_put (tm->half_open_connections, tc);
- else
- pool_put (tm->connections[tc->c_thread_index], tc);
+ tcp_cc_cleanup (tc);
+ vec_free (tc->snd_sacks);
+ vec_free (tc->snd_sacks_fl);
+ vec_free (tc->rcv_opts.sacks);
+ pool_free (tc->sack_sb.holes);
+
+ if (tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE)
+ tcp_bt_cleanup (tc);
+
+ tcp_connection_free (tc);
+ }
}
/**
void
tcp_connection_del (tcp_connection_t * tc)
{
- TCP_EVT_DBG (TCP_EVT_DELETE, tc);
- stream_session_delete_notify (&tc->connection);
+ session_transport_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.
- */
+tcp_connection_t *
+tcp_connection_alloc (u8 thread_index)
+{
+ tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
+ tcp_connection_t *tc;
+
+ pool_get (wrk->connections, tc);
+ clib_memset (tc, 0, sizeof (*tc));
+ tc->c_c_index = tc - wrk->connections;
+ tc->c_thread_index = thread_index;
+ return tc;
+}
+
+tcp_connection_t *
+tcp_connection_alloc_w_base (u8 thread_index, tcp_connection_t * base)
+{
+ tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
+ tcp_connection_t *tc;
+
+ pool_get (wrk->connections, tc);
+ clib_memcpy_fast (tc, base, sizeof (*tc));
+ tc->c_c_index = tc - wrk->connections;
+ tc->c_thread_index = thread_index;
+ return tc;
+}
+
void
-tcp_connection_reset (tcp_connection_t * tc)
+tcp_connection_free (tcp_connection_t * tc)
{
- if (tc->state == TCP_STATE_CLOSED)
- return;
+ tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
+ if (CLIB_DEBUG)
+ {
+ clib_memset (tc, 0xFA, sizeof (*tc));
+ pool_put (wrk->connections, tc);
+ return;
+ }
+ pool_put (wrk->connections, tc);
+}
- tc->state = TCP_STATE_CLOSED;
- stream_session_reset_notify (&tc->connection);
+void
+tcp_program_cleanup (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
+{
+ tcp_cleanup_req_t *req;
+ clib_time_type_t now;
+
+ now = transport_time_now (tc->c_thread_index);
+ clib_fifo_add2 (wrk->pending_cleanups, req);
+ req->connection_index = tc->c_c_index;
+ req->free_time = now + tcp_cfg.cleanup_time;
}
/**
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);
+ tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
- /* 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;
+ TCP_EVT (TCP_EVT_CLOSE, tc);
- /* 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);
+ /* Send/Program FIN if needed and switch state */
+ switch (tc->state)
+ {
+ case TCP_STATE_SYN_SENT:
+ /* Try to cleanup. If not on the right thread, mark as half-open done.
+ * Connection will be cleaned up when establish timer pops */
+ tcp_connection_cleanup (tc);
+ break;
+ case TCP_STATE_SYN_RCVD:
+ tcp_connection_timers_reset (tc);
+ tcp_send_fin (tc);
+ tcp_connection_set_state (tc, TCP_STATE_FIN_WAIT_1);
+ tcp_timer_update (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE,
+ tcp_cfg.finwait1_time);
+ break;
+ case TCP_STATE_ESTABLISHED:
+ /* If closing with unread data, reset the connection */
+ if (transport_max_rx_dequeue (&tc->connection))
+ {
+ tcp_send_reset (tc);
+ tcp_connection_timers_reset (tc);
+ tcp_connection_set_state (tc, TCP_STATE_CLOSED);
+ session_transport_closed_notify (&tc->connection);
+ tcp_program_cleanup (tcp_get_worker (tc->c_thread_index), tc);
+ tcp_worker_stats_inc (wrk, rst_unread, 1);
+ break;
+ }
+ if (!transport_max_tx_dequeue (&tc->connection))
+ tcp_send_fin (tc);
+ else
+ tc->flags |= TCP_CONN_FINPNDG;
+ tcp_connection_set_state (tc, TCP_STATE_FIN_WAIT_1);
+ /* Set a timer in case the peer stops responding. Otherwise the
+ * connection will be stuck here forever. */
+ ASSERT (tc->timers[TCP_TIMER_WAITCLOSE] == TCP_TIMER_HANDLE_INVALID);
+ tcp_timer_set (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE,
+ tcp_cfg.finwait1_time);
+ break;
+ case TCP_STATE_CLOSE_WAIT:
+ if (!transport_max_tx_dequeue (&tc->connection))
+ {
+ tcp_send_fin (tc);
+ tcp_connection_timers_reset (tc);
+ tcp_connection_set_state (tc, TCP_STATE_LAST_ACK);
+ tcp_timer_update (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE,
+ tcp_cfg.lastack_time);
+ }
+ else
+ tc->flags |= TCP_CONN_FINPNDG;
+ break;
+ case TCP_STATE_FIN_WAIT_1:
+ tcp_timer_update (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE,
+ tcp_cfg.finwait1_time);
+ break;
+ case TCP_STATE_CLOSED:
+ /* Cleanup should've been programmed already */
+ break;
+ default:
+ TCP_DBG ("state: %u", tc->state);
+ }
}
-void
+static void
tcp_session_close (u32 conn_index, u32 thread_index)
{
tcp_connection_t *tc;
tcp_connection_close (tc);
}
-void
+static 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;
+ if (!tc)
+ return;
+ tcp_connection_set_state (tc, TCP_STATE_CLOSED);
+ tcp_connection_cleanup (tc);
}
-#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)
+static void
+tcp_session_reset (u32 conn_index, u32 thread_index)
{
- 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 ();
-
- /* 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;
+ tcp_connection_t *tc;
+ tc = tcp_connection_get (conn_index, thread_index);
+ tcp_send_reset (tc);
+ tcp_connection_timers_reset (tc);
+ tcp_cong_recovery_off (tc);
+ tcp_connection_set_state (tc, TCP_STATE_CLOSED);
+ session_transport_closed_notify (&tc->connection);
+ tcp_program_cleanup (tcp_get_worker (thread_index), tc);
}
/**
void
tcp_connection_timers_reset (tcp_connection_t * tc)
{
+ tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
int i;
+
for (i = 0; i < TCP_N_TIMERS; i++)
- {
- tcp_timer_reset (tc, i);
- }
+ tcp_timer_reset (&wrk->timer_wheel, tc, i);
}
-/** 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)
+#if 0
+typedef struct ip4_tcp_hdr
{
- tcp_connection_timers_init (tc);
- tcp_set_snd_mss (tc);
- scoreboard_init (&tc->sack_sb);
- tcp_cc_init (tc);
-}
+ ip4_header_t ip;
+ tcp_header_t tcp;
+} ip4_tcp_hdr_t;
-int
-tcp_connection_open (ip46_address_t * rmt_addr, u16 rmt_port, u8 is_ip4)
+typedef struct ip6_tcp_hdr
{
- tcp_main_t *tm = vnet_get_tcp_main ();
- tcp_connection_t *tc;
- fib_prefix_t prefix;
- u32 fei, 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;
+ ip6_header_t ip;
+ tcp_header_t tcp;
+} ip6_tcp_hdr_t;
- 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;
+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;
- if (is_ip4)
+ lb = load_balance_get (dpo->dpoi_index);
+ if (tc->c_is_ip4)
{
- ip4_address_t *ip4;
- ip4 = ip_interface_get_first_ip (sw_if_index, 1);
- lcl_addr.ip4.as_u32 = ip4->as_u32;
+ ip4_tcp_hdr_t hdr;
+ clib_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_address_t *ip6;
- ip6 = ip_interface_get_first_ip (sw_if_index, 0);
- clib_memcpy (&lcl_addr.ip6, ip6, sizeof (*ip6));
+ ip6_tcp_hdr_t hdr;
+ clib_memset (&hdr, 0, sizeof (hdr));
+ hdr.ip.protocol = IP_PROTOCOL_TCP;
+ clib_memcpy_fast (&hdr.ip.src_address, &tc->c_lcl_ip.ip6,
+ sizeof (ip6_address_t));
+ clib_memcpy_fast (&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);
+}
- /* 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;
- }
+fib_node_index_t
+tcp_lookup_rmt_in_fib (tcp_connection_t * tc)
+{
+ fib_prefix_t prefix;
+ u32 fib_index;
- /*
- * Create connection and send SYN
- */
+ clib_memcpy_fast (&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);
+}
- pool_get (tm->half_open_connections, tc);
- memset (tc, 0, sizeof (*tc));
+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;
- 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;
+ fe = fib_entry_get (tc->c_rmt_fei);
+ if (fe->fe_lb.dpoi_type != DPO_LOAD_BALANCE)
+ return -1;
- /* The other connection vars will be initialized after SYN ACK */
- tcp_connection_timers_init (tc);
+ tcp_connection_select_lb_bucket (tc, &fe->fe_lb, &choice);
- tcp_send_syn (tc);
+ 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;
+}
- tc->state = TCP_STATE_SYN_SENT;
+/** 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);
- TCP_EVT_DBG (TCP_EVT_OPEN, tc);
+ ASSERT (tc->c_rmt_fei != FIB_NODE_INDEX_INVALID);
- return tc->c_c_index;
+ tcp_connection_stack_on_fib_entry (tc);
}
+#endif /* 0 */
-int
-tcp_session_open_ip4 (ip46_address_t * addr, u16 port)
+/**
+ * Generate random iss as per rfc6528
+ */
+static u32
+tcp_generate_random_iss (tcp_connection_t * tc)
{
- return tcp_connection_open (addr, port, 1);
+ tcp_main_t *tm = &tcp_main;
+ u64 tmp;
+
+ if (tc->c_is_ip4)
+ tmp = (u64) tc->c_lcl_ip.ip4.as_u32 << 32 | (u64) tc->c_rmt_ip.ip4.as_u32;
+ else
+ tmp = tc->c_lcl_ip.ip6.as_u64[0] ^ tc->c_lcl_ip.ip6.as_u64[1]
+ ^ tc->c_rmt_ip.ip6.as_u64[0] ^ tc->c_rmt_ip.ip6.as_u64[1];
+
+ tmp ^= tm->iss_seed.first | ((u64) tc->c_lcl_port << 16 | tc->c_rmt_port);
+ tmp ^= tm->iss_seed.second;
+ tmp = clib_xxhash (tmp) + clib_cpu_time_now ();
+ return ((tmp >> 32) ^ (tmp & 0xffffffff));
}
-int
-tcp_session_open_ip6 (ip46_address_t * addr, u16 port)
+/**
+ * Initialize max segment size we're able to process.
+ *
+ * The value is constrained by the output interface's MTU and by the size
+ * of the IP and TCP headers (see RFC6691). It is also what we advertise
+ * to our peer.
+ */
+static void
+tcp_init_rcv_mss (tcp_connection_t * tc)
{
- return tcp_connection_open (addr, port, 0);
+ u8 ip_hdr_len;
+
+ /* Already provided at connection init time */
+ if (tc->mss)
+ return;
+
+ ip_hdr_len = tc->c_is_ip4 ? sizeof (ip4_header_t) : sizeof (ip6_header_t);
+ tc->mss = tcp_cfg.default_mtu - sizeof (tcp_header_t) - ip_hdr_len;
}
-const char *tcp_dbg_evt_str[] = {
-#define _(sym, str) str,
- foreach_tcp_dbg_evt
-#undef _
-};
+static void
+tcp_init_mss (tcp_connection_t * tc)
+{
+ u16 default_min_mss = 536;
-const char *tcp_fsm_states[] = {
-#define _(sym, str) str,
- foreach_tcp_fsm_state
-#undef _
-};
+ tcp_init_rcv_mss (tc);
+
+ /* TODO consider PMTU discovery */
+ tc->snd_mss = clib_min (tc->rcv_opts.mss, tc->mss);
-u8 *
-format_tcp_state (u8 * s, va_list * args)
+ if (tc->snd_mss < 45)
+ {
+ /* Assume that at least the min default mss works */
+ tc->snd_mss = default_min_mss;
+ tc->rcv_opts.mss = default_min_mss;
+ }
+
+ /* We should have enough space for 40 bytes of options */
+ ASSERT (tc->snd_mss > 45);
+
+ /* If we use timestamp option, account for it */
+ if (tcp_opts_tstamp (&tc->rcv_opts))
+ tc->snd_mss -= TCP_OPTION_LEN_TIMESTAMP;
+}
+
+/**
+ * Initialize connection send variables.
+ */
+void
+tcp_init_snd_vars (tcp_connection_t * tc)
{
- tcp_state_t *state = va_arg (*args, tcp_state_t *);
+ /*
+ * 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 (tcp_get_worker (vlib_get_thread_index ()));
- if (*state < TCP_N_STATES)
- s = format (s, "%s", tcp_fsm_states[*state]);
- else
- s = format (s, "UNKNOWN");
+ tcp_init_rcv_mss (tc);
+ tc->iss = tcp_generate_random_iss (tc);
+ tc->snd_una = tc->iss;
+ tc->snd_nxt = tc->iss + 1;
+ tc->snd_una_max = tc->snd_nxt;
+ tc->srtt = 100; /* 100 ms */
- return s;
+ if (!tcp_cfg.csum_offload)
+ tc->cfg_flags |= TCP_CFG_F_NO_CSUM_OFFLOAD;
}
-const char *tcp_conn_timers[] = {
-#define _(sym, str) str,
- foreach_tcp_timer
-#undef _
-};
+void
+tcp_enable_pacing (tcp_connection_t * tc)
+{
+ u32 byte_rate;
+ byte_rate = tc->cwnd / (tc->srtt * TCP_TICK);
+ transport_connection_tx_pacer_init (&tc->connection, byte_rate, tc->cwnd);
+ tc->mrtt_us = (u32) ~ 0;
+}
-u8 *
-format_tcp_timers (u8 * s, va_list * args)
+/** 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_t *tc = va_arg (*args, tcp_connection_t *);
- int i, last = 0;
+ tcp_connection_timers_init (tc);
+ tcp_init_mss (tc);
+ scoreboard_init (&tc->sack_sb);
+ if (tc->state == TCP_STATE_SYN_RCVD)
+ tcp_init_snd_vars (tc);
- for (i = 0; i < TCP_N_TIMERS; i++)
- if (tc->timers[i] != TCP_TIMER_HANDLE_INVALID)
- last = i;
+ tcp_cc_init (tc);
- 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 (!tc->c_is_ip4 && ip6_address_is_link_local_unicast (&tc->c_rmt_ip6))
+ tcp_add_del_adjacency (tc, 1);
- if (last > 0)
- s = format (s, "%s]", tcp_conn_timers[i]);
- else
- s = format (s, "]");
+ /* tcp_connection_fib_attach (tc); */
- return s;
+ if (transport_connection_is_tx_paced (&tc->connection)
+ || tcp_cfg.enable_tx_pacing)
+ tcp_enable_pacing (tc);
+
+ if (tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE)
+ tcp_bt_init (tc);
+
+ if (!tcp_cfg.allow_tso)
+ tc->cfg_flags |= TCP_CFG_F_NO_TSO;
+
+ tc->start_ts = tcp_time_now_us (tc->c_thread_index);
}
-u8 *
-format_tcp_connection (u8 * s, va_list * args)
+static int
+tcp_alloc_custom_local_endpoint (tcp_main_t * tm, ip46_address_t * lcl_addr,
+ u16 * lcl_port, u8 is_ip4)
{
- tcp_connection_t *tc = va_arg (*args, tcp_connection_t *);
-
- if (tc->c_is_ip4)
+ int index, port;
+ if (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));
+ index = tm->last_v4_addr_rotor++;
+ if (tm->last_v4_addr_rotor >= vec_len (tcp_cfg.ip4_src_addrs))
+ tm->last_v4_addr_rotor = 0;
+ lcl_addr->ip4.as_u32 = tcp_cfg.ip4_src_addrs[index].as_u32;
}
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));
+ index = tm->last_v6_addr_rotor++;
+ if (tm->last_v6_addr_rotor >= vec_len (tcp_cfg.ip6_src_addrs))
+ tm->last_v6_addr_rotor = 0;
+ clib_memcpy_fast (&lcl_addr->ip6, &tcp_cfg.ip6_src_addrs[index],
+ sizeof (ip6_address_t));
}
-
- return s;
+ port = transport_alloc_local_port (TRANSPORT_PROTO_TCP, lcl_addr);
+ if (port < 1)
+ return SESSION_E_NOPORT;
+ *lcl_port = port;
+ return 0;
}
-u8 *
-format_tcp_connection_verbose (u8 * s, va_list * args)
+static int
+tcp_session_open (transport_endpoint_cfg_t * rmt)
{
- tcp_connection_t *tc = va_arg (*args, tcp_connection_t *);
- s = format (s, "%U %U %U", format_tcp_connection, tc, format_tcp_state,
- &tc->state, format_tcp_timers, tc);
- return s;
+ 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 (tcp_cfg.ip4_src_addrs))
+ || (!rmt->is_ip4 && vec_len (tcp_cfg.ip6_src_addrs)))
+ 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)
+ {
+ if (rv != SESSION_E_PORTINUSE)
+ return rv;
+
+ if (session_lookup_connection (rmt->fib_index, &lcl_addr, &rmt->ip,
+ lcl_port, rmt->port, TRANSPORT_PROTO_UDP,
+ rmt->is_ip4))
+ return SESSION_E_PORTINUSE;
+
+ /* 5-tuple is available so increase lcl endpoint refcount and proceed
+ * with connection allocation */
+ transport_share_local_endpoint (TRANSPORT_PROTO_UDP, &lcl_addr,
+ lcl_port);
+ }
+
+ /*
+ * 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;
+ tc->cc_algo = tcp_cc_algo_get (tcp_cfg.cc_algo);
+ /* The other connection vars will be initialized after SYN ACK */
+ tcp_connection_timers_init (tc);
+ tc->mss = rmt->mss;
+
+ TCP_EVT (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;
}
-u8 *
+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);
- return format (s, "%U", format_tcp_connection, tc);
+ if (tc)
+ s = format (s, "%U", format_tcp_connection, tc, verbose);
+ else
+ s = format (s, "empty\n");
+ return s;
}
-u8 *
+static u8 *
format_tcp_listener_session (u8 * s, va_list * args)
{
u32 tci = va_arg (*args, u32);
+ u32 __clib_unused thread_index = va_arg (*args, u32);
+ u32 verbose = va_arg (*args, u32);
tcp_connection_t *tc = tcp_listener_get (tci);
- return format (s, "%U", format_tcp_connection, tc);
+ s = format (s, "%-50U", format_tcp_connection_id, tc);
+ if (verbose)
+ s = format (s, "%-15U", format_tcp_state, tc->state);
+ return s;
}
-u8 *
+static u8 *
format_tcp_half_open_session (u8 * s, va_list * args)
{
u32 tci = va_arg (*args, u32);
+ u32 __clib_unused thread_index = va_arg (*args, u32);
tcp_connection_t *tc = tcp_half_open_connection_get (tci);
- return format (s, "%U", format_tcp_connection, tc);
+ return format (s, "%U", format_tcp_connection_id, tc);
}
-transport_connection_t *
+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);
+ if (PREDICT_FALSE (!tc))
+ return 0;
return &tc->connection;
}
-transport_connection_t *
+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;
}
-u16
-tcp_session_send_mss (transport_connection_t * trans_conn)
+static u16
+tcp_session_cal_goal_size (tcp_connection_t * tc)
{
- tcp_connection_t *tc = (tcp_connection_t *) trans_conn;
- return tc->snd_mss;
+ u16 goal_size = tc->snd_mss;
+
+ goal_size = TCP_MAX_GSO_SZ - tc->snd_mss % TCP_MAX_GSO_SZ;
+ goal_size = clib_min (goal_size, tc->snd_wnd / 2);
+
+ return goal_size > tc->snd_mss ? goal_size : 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
*/
-u32
-tcp_session_send_space (transport_connection_t * trans_conn)
+static inline u32
+tcp_snd_space_inline (tcp_connection_t * tc)
{
- u32 snd_space;
- tcp_connection_t *tc = (tcp_connection_t *) trans_conn;
-
- /* If we haven't gotten dupacks or if we did and have gotten sacked bytes
- * then we can still send */
- if (PREDICT_TRUE (tcp_in_fastrecovery (tc) == 0
- && (tc->rcv_dupacks == 0
- || tc->sack_sb.last_sacked_bytes)))
- {
- snd_space = tcp_available_snd_space (tc);
+ int snd_space;
- /* If we can't write at least a segment, don't try at all */
- if (snd_space < tc->snd_mss)
- return 0;
+ if (PREDICT_FALSE (tcp_in_fastrecovery (tc)
+ || tc->state == TCP_STATE_CLOSED))
+ return 0;
- /* round down to mss multiple */
- return snd_space - (snd_space % tc->snd_mss);
- }
+ snd_space = tcp_available_output_snd_space (tc);
- /* 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))
+ /* If we got dupacks or sacked bytes but we're not yet in recovery, try
+ * to force the peer to send enough dupacks to start retransmitting as
+ * per Limited Transmit (RFC3042)
+ */
+ if (PREDICT_FALSE (tc->rcv_dupacks != 0 || tc->sack_sb.sacked_bytes))
{
- tcp_fastrecovery_1_smss_on (tc);
- return tc->snd_mss;
- }
+ if (tc->limited_transmit != tc->snd_nxt
+ && (seq_lt (tc->limited_transmit, tc->snd_nxt - 2 * tc->snd_mss)
+ || seq_gt (tc->limited_transmit, tc->snd_nxt)))
+ tc->limited_transmit = tc->snd_nxt;
- return 0;
+ ASSERT (seq_leq (tc->limited_transmit, tc->snd_nxt));
+
+ int snt_limited = tc->snd_nxt - tc->limited_transmit;
+ snd_space = clib_max ((int) 2 * tc->snd_mss - snt_limited, 0);
+ }
+ return tcp_round_snd_space (tc, snd_space);
}
u32
-tcp_session_tx_fifo_offset (transport_connection_t * trans_conn)
+tcp_snd_space (tcp_connection_t * tc)
{
- 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);
+ return tcp_snd_space_inline (tc);
}
-/* *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)
+static int
+tcp_session_send_params (transport_connection_t * trans_conn,
+ transport_send_params_t * sp)
{
- 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_t *tc = (tcp_connection_t *) trans_conn;
- tcp_connection_close (tc);
-}
+ /* 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);
-void
-tcp_timer_establish_handler (u32 conn_index)
-{
- tcp_connection_t *tc;
- u8 sst;
+ if (PREDICT_FALSE (tc->cfg_flags & TCP_CFG_F_TSO))
+ sp->snd_mss = tcp_session_cal_goal_size (tc);
+ else
+ sp->snd_mss = tc->snd_mss;
- tc = tcp_half_open_connection_get (conn_index);
- tc->timers[TCP_TIMER_ESTABLISH] = TCP_TIMER_HANDLE_INVALID;
+ sp->snd_space = clib_min (tcp_snd_space_inline (tc),
+ tc->snd_wnd - (tc->snd_nxt - tc->snd_una));
- ASSERT (tc->state == TCP_STATE_SYN_SENT);
+ ASSERT (seq_geq (tc->snd_nxt, tc->snd_una));
+ /* This still works if fast retransmit is on */
+ sp->tx_offset = tc->snd_nxt - tc->snd_una;
- sst = tc->c_is_ip4 ? SESSION_TYPE_IP4_TCP : SESSION_TYPE_IP6_TCP;
- stream_session_connect_notify (&tc->connection, sst, 1 /* fail */ );
+ sp->flags = sp->snd_space ? 0 : TRANSPORT_SND_F_DESCHED;
- tcp_connection_cleanup (tc);
+ return 0;
}
-void
-tcp_timer_waitclose_handler (u32 conn_index)
+static void
+tcp_timer_waitclose_handler (tcp_connection_t * tc)
{
- u32 thread_index = vlib_get_thread_index ();
- tcp_connection_t *tc;
+ tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
- 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)
+ switch (tc->state)
{
- if (tc->flags & TCP_CONN_FINSNT)
+ case TCP_STATE_CLOSE_WAIT:
+ tcp_connection_timers_reset (tc);
+ /* App never returned with a close */
+ if (!(tc->flags & TCP_CONN_FINPNDG))
{
- clib_warning ("FIN was sent and still in CLOSE WAIT. Weird!");
+ tcp_connection_set_state (tc, TCP_STATE_CLOSED);
+ session_transport_closed_notify (&tc->connection);
+ tcp_program_cleanup (wrk, tc);
+ tcp_worker_stats_inc (wrk, to_closewait, 1);
+ break;
}
+ /* Send FIN either way and switch to LAST_ACK. */
+ tcp_cong_recovery_off (tc);
+ /* Make sure we don't try to send unsent data */
+ tc->snd_nxt = tc->snd_una;
tcp_send_fin (tc);
- tc->state = TCP_STATE_LAST_ACK;
+ tcp_connection_set_state (tc, TCP_STATE_LAST_ACK);
+ session_transport_closed_notify (&tc->connection);
/* Make sure we don't wait in LAST ACK forever */
- tcp_timer_set (tc, TCP_TIMER_WAITCLOSE, TCP_2MSL_TIME);
+ tcp_timer_set (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE,
+ tcp_cfg.lastack_time);
+ tcp_worker_stats_inc (wrk, to_closewait2, 1);
/* Don't delete the connection yet */
- return;
+ break;
+ case TCP_STATE_FIN_WAIT_1:
+ tcp_connection_timers_reset (tc);
+ if (tc->flags & TCP_CONN_FINPNDG)
+ {
+ /* If FIN pending, we haven't sent everything, but we did try.
+ * Notify session layer that transport is closed. */
+ tcp_connection_set_state (tc, TCP_STATE_CLOSED);
+ tcp_send_reset (tc);
+ tcp_program_cleanup (wrk, tc);
+ }
+ else
+ {
+ /* We've sent the fin but no progress. Close the connection and
+ * to make sure everything is flushed, setup a cleanup timer */
+ tcp_connection_set_state (tc, TCP_STATE_CLOSED);
+ tcp_program_cleanup (wrk, tc);
+ }
+ session_transport_closed_notify (&tc->connection);
+ tcp_worker_stats_inc (wrk, to_finwait1, 1);
+ break;
+ case TCP_STATE_LAST_ACK:
+ tcp_connection_timers_reset (tc);
+ tcp_connection_set_state (tc, TCP_STATE_CLOSED);
+ session_transport_closed_notify (&tc->connection);
+ tcp_program_cleanup (wrk, tc);
+ tcp_worker_stats_inc (wrk, to_lastack, 1);
+ break;
+ case TCP_STATE_CLOSING:
+ tcp_connection_timers_reset (tc);
+ tcp_connection_set_state (tc, TCP_STATE_CLOSED);
+ session_transport_closed_notify (&tc->connection);
+ tcp_program_cleanup (wrk, tc);
+ tcp_worker_stats_inc (wrk, to_closing, 1);
+ break;
+ case TCP_STATE_FIN_WAIT_2:
+ tcp_send_reset (tc);
+ tcp_connection_timers_reset (tc);
+ tcp_connection_set_state (tc, TCP_STATE_CLOSED);
+ session_transport_closed_notify (&tc->connection);
+ tcp_program_cleanup (wrk, tc);
+ tcp_worker_stats_inc (wrk, to_finwait2, 1);
+ break;
+ case TCP_STATE_TIME_WAIT:
+ tcp_connection_set_state (tc, TCP_STATE_CLOSED);
+ tcp_program_cleanup (wrk, tc);
+ break;
+ default:
+ clib_warning ("waitclose in state: %U", format_tcp_state, tc->state);
+ break;
}
-
- tcp_connection_del (tc);
}
/* *INDENT-OFF* */
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_dispatch_pending_timers (tcp_worker_ctx_t * wrk)
+{
+ u32 n_timers, connection_index, timer_id, thread_index, timer_handle;
+ tcp_connection_t *tc;
+ int i;
+
+ if (!(n_timers = clib_fifo_elts (wrk->pending_timers)))
+ return;
+
+ thread_index = wrk->vm->thread_index;
+ for (i = 0; i < clib_min (n_timers, wrk->max_timers_per_loop); i++)
+ {
+ clib_fifo_sub1 (wrk->pending_timers, timer_handle);
+ connection_index = timer_handle & 0x0FFFFFFF;
+ timer_id = timer_handle >> 28;
+
+ if (PREDICT_TRUE (timer_id != TCP_TIMER_RETRANSMIT_SYN))
+ tc = tcp_connection_get (connection_index, thread_index);
+ else
+ tc = tcp_half_open_connection_get (connection_index);
+
+ if (PREDICT_FALSE (!tc))
+ continue;
+
+ /* Skip timer if it was rearmed while pending dispatch */
+ if (PREDICT_FALSE (tc->timers[timer_id] != TCP_TIMER_HANDLE_INVALID))
+ continue;
+
+ (*timer_expiration_handlers[timer_id]) (tc);
+ }
+
+ if (thread_index == 0 && clib_fifo_elts (wrk->pending_timers))
+ session_queue_run_on_main_thread (wrk->vm);
+}
+
+static void
+tcp_handle_cleanups (tcp_worker_ctx_t * wrk, clib_time_type_t now)
+{
+ u32 thread_index = wrk->vm->thread_index;
+ tcp_cleanup_req_t *req;
+ tcp_connection_t *tc;
+
+ while (clib_fifo_elts (wrk->pending_cleanups))
+ {
+ req = clib_fifo_head (wrk->pending_cleanups);
+ if (req->free_time > now)
+ break;
+ clib_fifo_sub2 (wrk->pending_cleanups, req);
+ tc = tcp_connection_get (req->connection_index, thread_index);
+ if (PREDICT_FALSE (!tc))
+ continue;
+ session_transport_delete_notify (&tc->connection);
+ tcp_connection_cleanup (tc);
+ }
+}
+
+static void
+tcp_update_time (f64 now, u8 thread_index)
+{
+ tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
+
+ tcp_set_time_now (wrk);
+ tcp_handle_cleanups (wrk, now);
+ tw_timer_expire_timers_16t_2w_512sl (&wrk->timer_wheel, now);
+ tcp_dispatch_pending_timers (wrk);
+}
+
+static void
+tcp_session_flush_data (transport_connection_t * tconn)
+{
+ tcp_connection_t *tc = (tcp_connection_t *) tconn;
+ if (tc->flags & TCP_CONN_PSH_PENDING)
+ return;
+ tc->flags |= TCP_CONN_PSH_PENDING;
+ tc->psh_seq = tc->snd_una + transport_max_tx_dequeue (tconn) - 1;
+}
+
+/* *INDENT-OFF* */
+const static transport_proto_vft_t tcp_proto = {
+ .enable = vnet_tcp_enable_disable,
+ .start_listen = tcp_session_bind,
+ .stop_listen = 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,
+ .connect = tcp_session_open,
+ .close = tcp_session_close,
+ .cleanup = tcp_session_cleanup,
+ .reset = tcp_session_reset,
+ .send_params = tcp_session_send_params,
+ .update_time = tcp_update_time,
+ .flush_data = tcp_session_flush_data,
+ .custom_tx = tcp_session_custom_tx,
+ .format_connection = format_tcp_session,
+ .format_listener = format_tcp_listener_session,
+ .format_half_open = format_tcp_half_open_session,
+ .transport_options = {
+ .name = "tcp",
+ .short_name = "T",
+ .tx_type = TRANSPORT_TX_PEEK,
+ .service_type = TRANSPORT_SERVICE_VC,
+ },
+};
+/* *INDENT-ON* */
+
+void
+tcp_connection_tx_pacer_update (tcp_connection_t * tc)
+{
+ if (!transport_connection_is_tx_paced (&tc->connection))
+ return;
+
+ f64 srtt = clib_min ((f64) tc->srtt * TCP_TICK, tc->mrtt_us);
+
+ transport_connection_tx_pacer_update (&tc->connection,
+ tcp_cc_get_pacing_rate (tc),
+ srtt * CLIB_US_TIME_FREQ);
+}
+
+void
+tcp_connection_tx_pacer_reset (tcp_connection_t * tc, u32 window,
+ u32 start_bucket)
+{
+ f64 srtt = clib_min ((f64) tc->srtt * TCP_TICK, tc->mrtt_us);
+ transport_connection_tx_pacer_reset (&tc->connection,
+ tcp_cc_get_pacing_rate (tc),
+ start_bucket,
+ srtt * CLIB_US_TIME_FREQ);
+}
+
+void
+tcp_reschedule (tcp_connection_t * tc)
+{
+ if (tcp_in_cong_recovery (tc) || tcp_snd_space_inline (tc))
+ transport_connection_reschedule (&tc->connection);
+}
+
static void
tcp_expired_timers_dispatch (u32 * expired_timers)
{
+ u32 thread_index = vlib_get_thread_index (), n_left, max_per_loop;
+ u32 connection_index, timer_id, n_expired, max_loops;
+ tcp_worker_ctx_t *wrk;
+ tcp_connection_t *tc;
int i;
- u32 connection_index, timer_id;
- for (i = 0; i < vec_len (expired_timers); i++)
+ wrk = tcp_get_worker (thread_index);
+ n_expired = vec_len (expired_timers);
+ tcp_worker_stats_inc (wrk, timer_expirations, n_expired);
+ n_left = clib_fifo_elts (wrk->pending_timers);
+
+ /*
+ * Invalidate all timer handles before dispatching. This avoids dangling
+ * index references to timer wheel pool entries that have been freed.
+ */
+ for (i = 0; i < n_expired; 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);
+ if (timer_id != TCP_TIMER_RETRANSMIT_SYN)
+ tc = tcp_connection_get (connection_index, thread_index);
+ else
+ tc = tcp_half_open_connection_get (connection_index);
- /* Handle expiration */
- (*timer_expiration_handlers[timer_id]) (connection_index);
+ TCP_EVT (TCP_EVT_TIMER_POP, connection_index, timer_id);
+
+ tc->timers[timer_id] = TCP_TIMER_HANDLE_INVALID;
}
+
+ clib_fifo_add (wrk->pending_timers, expired_timers, n_expired);
+
+ max_loops = clib_max (1, 0.5 * TCP_TIMER_TICK * wrk->vm->loops_per_second);
+ max_per_loop = clib_max ((n_left + n_expired) / max_loops, 10);
+ max_per_loop = clib_min (max_per_loop, VLIB_FRAME_SIZE);
+ wrk->max_timers_per_loop = clib_max (n_left ? wrk->max_timers_per_loop : 0,
+ max_per_loop);
+
+ if (thread_index == 0)
+ session_queue_run_on_main_thread (wrk->vm);
}
-void
+static void
tcp_initialize_timer_wheels (tcp_main_t * tm)
{
tw_timer_wheel_16t_2w_512sl_t *tw;
- vec_foreach (tw, tm->timer_wheels)
- {
+ /* *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 (tm->vlib_main);
- }
+ TCP_TIMER_TICK, ~0);
+ tw->last_run_time = vlib_time_now (this_vlib_main);
+ }));
+ /* *INDENT-ON* */
}
-clib_error_t *
+static void
+tcp_initialize_iss_seed (tcp_main_t * tm)
+{
+ u32 default_seed = random_default_seed ();
+ u64 time_now = clib_cpu_time_now ();
+
+ tm->iss_seed.first = (u64) random_u32 (&default_seed) << 32;
+ tm->iss_seed.second = random_u64 (&time_now);
+}
+
+static 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 ();
+ u32 num_threads, n_workers, prealloc_conn_per_wrk;
+ tcp_connection_t *tc __attribute__ ((unused));
+ tcp_main_t *tm = vnet_get_tcp_main ();
+ tcp_worker_ctx_t *wrk;
clib_error_t *error = 0;
- u32 num_threads;
+ int thread;
if ((error = vlib_call_init_function (vm, ip_main_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);
+ 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);
+ vec_validate (tm->wrk_ctx, num_threads - 1);
+ n_workers = num_threads == 1 ? 1 : vtm->n_threads;
+ prealloc_conn_per_wrk = tcp_cfg.preallocated_connections / n_workers;
- /* Initialize per worker thread tx buffers (used for control messages) */
- vec_validate (tm->tx_buffers, num_threads - 1);
+ wrk = &tm->wrk_ctx[0];
+ wrk->tco_next_node[0] = vlib_node_get_next (vm, session_queue_node.index,
+ tcp4_output_node.index);
+ wrk->tco_next_node[1] = vlib_node_get_next (vm, session_queue_node.index,
+ tcp6_output_node.index);
- /* Initialize timer wheels */
- vec_validate (tm->timer_wheels, num_threads - 1);
- tcp_initialize_timer_wheels (tm);
+ for (thread = 0; thread < num_threads; thread++)
+ {
+ wrk = &tm->wrk_ctx[thread];
+
+ vec_validate (wrk->pending_deq_acked, 255);
+ vec_validate (wrk->pending_disconnects, 255);
+ vec_validate (wrk->pending_resets, 255);
+ vec_reset_length (wrk->pending_deq_acked);
+ vec_reset_length (wrk->pending_disconnects);
+ vec_reset_length (wrk->pending_resets);
+ wrk->vm = vlib_mains[thread];
+ wrk->max_timers_per_loop = 10;
+
+ if (thread > 0)
+ {
+ wrk->tco_next_node[0] = tm->wrk_ctx[0].tco_next_node[0];
+ wrk->tco_next_node[1] = tm->wrk_ctx[0].tco_next_node[1];
+ }
-// vec_validate (tm->delack_connections, num_threads - 1);
+ /*
+ * Preallocate connections. Assume that thread 0 won't
+ * use preallocated threads when running multi-core
+ */
+ if ((thread > 0 || num_threads == 1) && prealloc_conn_per_wrk)
+ pool_init_fixed (wrk->connections, prealloc_conn_per_wrk);
+ }
+
+ /*
+ * Use a preallocated half-open connection pool?
+ */
+ if (tcp_cfg.preallocated_half_open_connections)
+ pool_init_fixed (tm->half_open_connections,
+ tcp_cfg.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;
- clib_bihash_init_24_8 (&tm->local_endpoints_table, "local endpoint table",
- 200000 /* $$$$ config parameter nbuckets */ ,
- (64 << 20) /*$$$ config parameter table size */ );
+ if (num_threads > 1)
+ {
+ clib_spinlock_init (&tm->half_open_lock);
+ }
+
+ tcp_initialize_timer_wheels (tm);
+ tcp_initialize_iss_seed (tm);
+
+ tm->bytes_per_buffer = vlib_buffer_get_default_data_size (vm);
+ tm->cc_last_type = TCP_CC_LAST;
+ tm->ipl_next_node[0] = vlib_node_get_next (vm, session_queue_node.index,
+ ip4_lookup_node.index);
+ tm->ipl_next_node[1] = vlib_node_get_next (vm, session_queue_node.index,
+ ip6_lookup_node.index);
return error;
}
return 0;
}
-clib_error_t *
+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;
+}
+
+/**
+ * Initialize default values for tcp parameters
+ */
+static void
+tcp_configuration_init (void)
+{
+ /* Initial wnd for SYN. Fifos are not allocated at that point so use some
+ * predefined value. For SYN-ACK we still want the scale to be computed in
+ * the same way */
+ tcp_cfg.max_rx_fifo = 32 << 20;
+ tcp_cfg.min_rx_fifo = 4 << 10;
+
+ tcp_cfg.default_mtu = 1500;
+ tcp_cfg.initial_cwnd_multiplier = 0;
+ tcp_cfg.enable_tx_pacing = 1;
+ tcp_cfg.allow_tso = 0;
+ tcp_cfg.csum_offload = 1;
+ tcp_cfg.cc_algo = TCP_CC_NEWRENO;
+ tcp_cfg.rwnd_min_update_ack = 1;
+
+ /* Time constants defined as timer tick (100ms) multiples */
+ tcp_cfg.delack_time = 1; /* 0.1s */
+ tcp_cfg.closewait_time = 20; /* 2s */
+ tcp_cfg.timewait_time = 100; /* 10s */
+ tcp_cfg.finwait1_time = 600; /* 60s */
+ tcp_cfg.lastack_time = 300; /* 30s */
+ tcp_cfg.finwait2_time = 300; /* 30s */
+ tcp_cfg.closing_time = 300; /* 30s */
+ tcp_cfg.cleanup_time = 0.1; /* 100ms */
+}
+
+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;
- tm->vlib_main = vm;
- tm->vnet_main = vnet_get_main ();
+ /* 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_configuration_init ();
+
+ tm->cc_algo_by_name = hash_create_string (0, sizeof (uword));
+
return 0;
}
Code Review / vpp.git / blobdiff