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c1f93067ed4b9954bbba82e2c9c104b22e2f7f33
vpp/src/vnet/tcp/tcp.c
Florin Coras 6416e6274d tcp: do not delete session on establish pop 
Also:
- force reset if wait close pops in fin-wait-1 with unsent data
- adds more event logging.

Change-Id: I4ddada046214fa71e17514cdec57b3026f84a283
Signed-off-by: Florin Coras <fcoras@cisco.com>
2019-04-05 07:51:41 +00:00

2118 lines
57 KiB
C
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/*
* 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:
*
* 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);
clib_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)
clib_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)
clib_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_AO);
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);
clib_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;
TCP_EVT_DBG (TCP_EVT_DELETE, tc);
/* 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);
vec_free (tc->snd_sacks);
vec_free (tc->snd_sacks_fl);
/* Poison the entry */
if (CLIB_DEBUG > 0)
clib_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)
{
session_transport_delete_notify (&tc->connection);
tcp_connection_cleanup (tc);
}
tcp_connection_t *
tcp_connection_alloc (u8 thread_index)
{
tcp_main_t *tm = vnet_get_tcp_main ();
tcp_connection_t *tc;
pool_get (tm->connections[thread_index], tc);
clib_memset (tc, 0, sizeof (*tc));
tc->c_c_index = tc - tm->connections[thread_index];
tc->c_thread_index = thread_index;
return tc;
}
void
tcp_connection_free (tcp_connection_t * tc)
{
tcp_main_t *tm = &tcp_main;
if (CLIB_DEBUG)
{
u8 thread_index = tc->c_thread_index;
clib_memset (tc, 0xFA, sizeof (*tc));
pool_put (tm->connections[thread_index], tc);
return;
}
pool_put (tm->connections[tc->c_thread_index], 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 */
session_transport_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_set (tc, TCP_TIMER_WAITCLOSE, TCP_CLOSEWAIT_TIME);
session_transport_reset_notify (&tc->connection);
tcp_connection_set_state (tc, TCP_STATE_CLOSED);
break;
case TCP_STATE_CLOSE_WAIT:
case TCP_STATE_FIN_WAIT_1:
case TCP_STATE_FIN_WAIT_2:
case TCP_STATE_CLOSING:
case TCP_STATE_LAST_ACK:
tcp_connection_timers_reset (tc);
tcp_timer_set (tc, TCP_TIMER_WAITCLOSE, TCP_CLOSEWAIT_TIME);
/* Make sure we mark the session as closed. In some states we may
* be still trying to send data */
session_transport_closed_notify (&tc->connection);
tcp_connection_set_state (tc, TCP_STATE_CLOSED);
break;
case TCP_STATE_CLOSED:
case TCP_STATE_TIME_WAIT:
break;
default:
TCP_DBG ("reset state: %u", tc->state);
}
}
/**
* 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:
/* 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 (tc, TCP_TIMER_WAITCLOSE, TCP_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);
tcp_timer_set (tc, TCP_TIMER_WAITCLOSE, TCP_CLOSEWAIT_TIME);
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 (tc, TCP_TIMER_WAITCLOSE, TCP_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 (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;
case TCP_STATE_CLOSED:
tcp_connection_timers_reset (tc);
/* Delete connection but instead of doing it now wait until next
* dispatch cycle to give the session layer a chance to clear
* unhandled events */
tcp_timer_update (tc, TCP_TIMER_WAITCLOSE, TCP_CLEANUP_TIME);
break;
default:
TCP_DBG ("state: %u", tc->state);
}
}
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_set_state (tc, TCP_STATE_CLOSED);
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;
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_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);
}
fib_node_index_t
tcp_lookup_rmt_in_fib (tcp_connection_t * tc)
{
fib_prefix_t prefix;
u32 fib_index;
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);
}
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_main.cc_algo);
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;
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];
}
/**
* Generate random iss as per rfc6528
*/
static u32
tcp_generate_random_iss (tcp_connection_t * tc)
{
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));
}
/**
* Initialize connection send variables.
*/
void
tcp_init_snd_vars (tcp_connection_t * tc)
{
/*
* 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 ()));
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 = 0;
}
void
tcp_enable_pacing (tcp_connection_t * tc)
{
u32 initial_bucket, byte_rate;
initial_bucket = 16 * tc->snd_mss;
byte_rate = 2 << 16;
transport_connection_tx_pacer_init (&tc->connection, byte_rate,
initial_bucket);
tc->mrtt_us = (u32) ~ 0;
}
/** Initialize tcp connection variables
*
* Should be called after having received a msg from the peer, i.e., a SYN or
* a SYNACK, such that connection options have already been exchanged. */
void
tcp_connection_init_vars (tcp_connection_t * tc)
{
tcp_connection_timers_init (tc);
tcp_init_mss (tc);
scoreboard_init (&tc->sack_sb);
tcp_cc_init (tc);
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); */
if (transport_connection_is_tx_paced (&tc->connection)
|| tcp_main.tx_pacing)
tcp_enable_pacing (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_fast (&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_session_open (transport_endpoint_cfg_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;
}
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;
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]);
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_congestion (u8 * s, va_list * args)
{
tcp_connection_t *tc = va_arg (*args, tcp_connection_t *);
u32 indent = format_get_indent (s);
s = format (s, "%U ", format_tcp_congestion_status, tc);
s = format (s, "algo %s cwnd %u ssthresh %u bytes_acked %u\n",
tc->cc_algo->name, tc->cwnd, tc->ssthresh, tc->bytes_acked);
s = format (s, "%Ucc space %u prev_cwnd %u prev_ssthresh %u rtx_bytes %u\n",
format_white_space, indent, tcp_available_cc_snd_space (tc),
tc->prev_cwnd, tc->prev_ssthresh, tc->snd_rxt_bytes);
s = format (s, "%Usnd_congestion %u dupack %u limited_transmit %u\n",
format_white_space, indent, tc->snd_congestion - tc->iss,
tc->rcv_dupacks, tc->limited_transmit - tc->iss);
return s;
}
static u8 *
format_tcp_vars (u8 * s, va_list * args)
{
tcp_connection_t *tc = va_arg (*args, tcp_connection_t *);
s = format (s, " index: %u flags: %U timers: %U\n", tc->c_c_index,
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 rcv_wnd_av %u",
tcp_flight_size (tc), tcp_available_output_snd_space (tc),
tcp_rcv_wnd_available (tc));
s = format (s, " tsval_recent %u\n", tc->tsval_recent);
s = format (s, " tsecr %u tsecr_last_ack %u tsval_recent_age %u",
tc->rcv_opts.tsecr, tc->tsecr_last_ack,
tcp_time_now () - tc->tsval_recent_age);
s = format (s, " snd_mss %u\n", tc->snd_mss);
s = format (s, " rto %u rto_boff %u srtt %u us %.3f rttvar %u rtt_ts %.4f",
tc->rto, tc->rto_boff, tc->srtt, tc->mrtt_us * 1000, tc->rttvar,
tc->rtt_ts);
s = format (s, " rtt_seq %u\n", tc->rtt_seq - tc->iss);
s = format (s, " cong: %U", format_tcp_congestion, tc);
if (tc->state >= TCP_STATE_ESTABLISHED)
{
s = format (s, " sboard: %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:%d][%s] %U:%d->%U:%d", tc->c_thread_index,
tc->c_s_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:%d][%s] %U:%d->%U:%d", tc->c_thread_index,
tc->c_s_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);
u32 verbose = va_arg (*args, u32);
tcp_connection_t *tc = tcp_listener_get (tci);
s = format (s, "%-50U", format_tcp_connection_id, tc);
if (verbose)
s = format (s, "%-15U", format_tcp_state, tc->state);
return s;
}
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;
u32 indent = format_get_indent (s);
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, "%Ulast_bytes_delivered %u high_sacked %u snd_una_adv %u\n",
format_white_space, indent, sb->last_bytes_delivered,
sb->high_sacked - tc->iss, sb->snd_una_adv);
s = format (s, "%Ucur_rxt_hole %u high_rxt %u rescue_rxt %u",
format_white_space, indent, 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%Uhead %u tail %u %u holes:\n%U", format_white_space,
indent, sb->head, sb->tail, pool_elts (sb->holes),
format_white_space, indent);
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_FALSE (tcp_in_fastrecovery (tc)
|| tc->state == TCP_STATE_CLOSED))
return 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);
}
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_worker_ctx_t *wrk = tcp_get_worker (thread_index);
tcp_set_time_now (wrk);
tw_timer_expire_timers_16t_2w_512sl (&wrk->timer_wheel, now);
tcp_do_fastretransmits (wrk);
tcp_send_acks (wrk);
tcp_flush_frames_to_output (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,
.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,
.flush_data = tcp_session_flush_data,
.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* */
void
tcp_connection_tx_pacer_update (tcp_connection_t * tc)
{
f64 srtt;
u64 rate;
if (!transport_connection_is_tx_paced (&tc->connection))
return;
srtt = clib_min ((f64) tc->srtt * TCP_TICK, tc->mrtt_us);
/* TODO should constrain to interface's max throughput but
* we don't have link speeds for sw ifs ..*/
rate = tc->cwnd / srtt;
transport_connection_tx_pacer_update (&tc->connection, rate);
}
void
tcp_connection_tx_pacer_reset (tcp_connection_t * tc, u32 window,
u32 start_bucket)
{
tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
u32 byte_rate = window / ((f64) TCP_TICK * tc->srtt);
u64 last_time = wrk->vm->clib_time.last_cpu_time;
transport_connection_tx_pacer_reset (&tc->connection, byte_rate,
start_bucket, last_time);
}
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_connection_get (conn_index, vlib_get_thread_index ());
/* note: the connection may have already disappeared */
if (PREDICT_FALSE (tc == 0))
return;
ASSERT (tc->state == TCP_STATE_SYN_RCVD);
tc->timers[TCP_TIMER_ESTABLISH] = TCP_TIMER_HANDLE_INVALID;
tcp_connection_set_state (tc, TCP_STATE_CLOSED);
tcp_connection_timers_reset (tc);
/* Start cleanup. Do NOT delete the session until we do the connection
* cleanup. Otherwise, we end up with a dangling session index in the
* tcp connection. */
tcp_timer_update (tc, TCP_TIMER_WAITCLOSE, TCP_CLEANUP_TIME);
}
static void
tcp_timer_establish_ao_handler (u32 conn_index)
{
tcp_connection_t *tc;
tc = tcp_half_open_connection_get (conn_index);
if (!tc)
return;
ASSERT (tc->state == TCP_STATE_SYN_SENT);
/* Notify app if we haven't tried to clean this up already */
if (!(tc->flags & TCP_CONN_HALF_OPEN_DONE))
session_stream_connect_notify (&tc->connection, 1 /* fail */ );
tc->timers[TCP_TIMER_ESTABLISH_AO] = 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;
switch (tc->state)
{
case TCP_STATE_CLOSE_WAIT:
tcp_connection_timers_reset (tc);
session_transport_closed_notify (&tc->connection);
if (!(tc->flags & TCP_CONN_FINPNDG))
{
tcp_connection_set_state (tc, TCP_STATE_CLOSED);
tcp_timer_set (tc, TCP_TIMER_WAITCLOSE, TCP_CLEANUP_TIME);
break;
}
/* Session didn't come back with a close. 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);
tcp_connection_set_state (tc, 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 */
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);
session_transport_closed_notify (&tc->connection);
tcp_send_reset (tc);
tcp_timer_set (tc, TCP_TIMER_WAITCLOSE, TCP_CLEANUP_TIME);
}
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_timer_set (tc, TCP_TIMER_WAITCLOSE, TCP_CLEANUP_TIME);
}
break;
case TCP_STATE_LAST_ACK:
case TCP_STATE_CLOSING:
tcp_connection_timers_reset (tc);
tcp_connection_set_state (tc, TCP_STATE_CLOSED);
tcp_timer_set (tc, TCP_TIMER_WAITCLOSE, TCP_CLEANUP_TIME);
session_transport_closed_notify (&tc->connection);
break;
default:
tcp_connection_del (tc);
break;
}
}
/* *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,
tcp_timer_establish_ao_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 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)
{
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 ();
clib_error_t *error = 0;
int 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);
vec_validate (tm->wrk_ctx, num_threads - 1);
n_workers = num_threads == 1 ? 1 : vtm->n_threads;
prealloc_conn_per_wrk = tm->preallocated_connections / n_workers;
for (thread = 0; thread < num_threads; thread++)
{
vec_validate (tm->wrk_ctx[thread].pending_fast_rxt, 255);
vec_validate (tm->wrk_ctx[thread].ongoing_fast_rxt, 255);
vec_validate (tm->wrk_ctx[thread].postponed_fast_rxt, 255);
vec_validate (tm->wrk_ctx[thread].pending_deq_acked, 255);
vec_validate (tm->wrk_ctx[thread].pending_acks, 255);
vec_validate (tm->wrk_ctx[thread].pending_disconnects, 255);
vec_reset_length (tm->wrk_ctx[thread].pending_fast_rxt);
vec_reset_length (tm->wrk_ctx[thread].ongoing_fast_rxt);
vec_reset_length (tm->wrk_ctx[thread].postponed_fast_rxt);
vec_reset_length (tm->wrk_ctx[thread].pending_deq_acked);
vec_reset_length (tm->wrk_ctx[thread].pending_acks);
vec_reset_length (tm->wrk_ctx[thread].pending_disconnects);
tm->wrk_ctx[thread].vm = vlib_mains[thread];
/*
* 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 (tm->connections[thread], prealloc_conn_per_wrk);
}
/*
* 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);
}
tcp_initialize_timer_wheels (tm);
tcp_initialize_iss_seed (tm);
tm->bytes_per_buffer = vlib_buffer_get_default_data_size (vm);
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 ();
tm->cc_algo_by_name = hash_create_string (0, sizeof (uword));
tm->tx_pacing = 1;
tm->cc_algo = TCP_CC_NEWRENO;
tm->default_mtu = 1460;
return 0;
}
VLIB_INIT_FUNCTION (tcp_init);
uword
unformat_tcp_cc_algo (unformat_input_t * input, va_list * va)
{
uword *result = va_arg (*va, uword *);
tcp_main_t *tm = &tcp_main;
char *cc_algo_name;
u8 found = 0;
uword *p;
if (unformat (input, "%s", &cc_algo_name)
&& ((p = hash_get_mem (tm->cc_algo_by_name, cc_algo_name))))
{
*result = *p;
found = 1;
}
vec_free (cc_algo_name);
return found;
}
uword
unformat_tcp_cc_algo_cfg (unformat_input_t * input, va_list * va)
{
tcp_main_t *tm = vnet_get_tcp_main ();
tcp_cc_algorithm_t *cc_alg;
unformat_input_t sub_input;
int found = 0;
vec_foreach (cc_alg, tm->cc_algos)
{
if (!unformat (input, cc_alg->name))
continue;
if (cc_alg->unformat_cfg
&& unformat (input, "%U", unformat_vlib_cli_sub_input, &sub_input))
{
if (cc_alg->unformat_cfg (&sub_input))
found = 1;
}
}
return found;
}
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 if (unformat (input, "mtu %d", &tm->default_mtu))
;
else if (unformat (input, "no-tx-pacing"))
tm->tx_pacing = 0;
else if (unformat (input, "cc-algo %U", unformat_tcp_cc_algo,
&tm->cc_algo))
;
else if (unformat (input, "%U", unformat_tcp_cc_algo_cfg))
;
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);
clib_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;
clib_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 (!TCP_SCOREBOARD_TRACE)
{
s = format (s, "scoreboard tracing not enabled");
return s;
}
if (!tc)
return s;
clib_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);
#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:
*/
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