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2ff21af396b3f22147f439c62a80a5eaeda6cdf1
vpp/src/vnet/tcp/tcp.c
Florin Coras 2ff21af396 session: improve cli 
Type: feature

Allow session cli filtering based on thread index, transport protocol,
session state and range of session pool indices. For instance

show session thread 1 proto tcp state ready range 0 20 verbose

Shows the session ids for the first 20 tcp sessions in thread 1 that are
in ready state.

To avoid excessive output that could reasult in the worker barrier being
held by the main thread for long periods of time, the session cli will
only output:
- session ids (verbose == 1) for a maximum of 50 sessions / worker
- verbose > 1 details for a maximum of 10 sessions

Change-Id: I2cfb351b548e2e0a1d5b4345810be613e2917d17
Signed-off-by: Florin Coras <fcoras@cisco.com>
(cherry picked from commit 5bb23ecd09)
2019-09-30 00:08:22 +00:00

2233 lines
60 KiB
C
Raw Blame History

/*
* 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>
#include <vnet/ethernet/arp.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, 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;
listener->cc_algo = tcp_cc_algo_get (tcp_cfg.cc_algo);
tcp_connection_timers_init (listener);
TCP_EVT (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 (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_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 (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);
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->flags & TCP_CONN_RATE_SAMPLE)
tcp_bt_cleanup (tc);
/* 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;
}
tcp_connection_t *
tcp_connection_alloc_w_base (u8 thread_index, tcp_connection_t * base)
{
tcp_main_t *tm = vnet_get_tcp_main ();
tcp_connection_t *tc;
pool_get (tm->connections[thread_index], tc);
clib_memcpy_fast (tc, base, 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 (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_cfg.closewait_time);
session_transport_reset_notify (&tc->connection);
tcp_connection_set_state (tc, TCP_STATE_CLOSED);
session_transport_closed_notify (&tc->connection);
break;
case TCP_STATE_CLOSE_WAIT:
case TCP_STATE_FIN_WAIT_1:
case TCP_STATE_FIN_WAIT_2:
case TCP_STATE_CLOSING:
case TCP_STATE_LAST_ACK:
tcp_connection_timers_reset (tc);
tcp_timer_set (tc, TCP_TIMER_WAITCLOSE, tcp_cfg.closewait_time);
/* Make sure we mark the session as closed. In some states we may
* be still trying to send data */
tcp_connection_set_state (tc, TCP_STATE_CLOSED);
session_transport_closed_notify (&tc->connection);
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 (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_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);
tcp_timer_set (tc, TCP_TIMER_WAITCLOSE, tcp_cfg.closewait_time);
session_transport_closed_notify (&tc->connection);
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_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 (tc, TCP_TIMER_WAITCLOSE, tcp_cfg.lastack_time);
}
else
tc->flags |= TCP_CONN_FINPNDG;
break;
case TCP_STATE_FIN_WAIT_1:
tcp_timer_update (tc, TCP_TIMER_WAITCLOSE, tcp_cfg.finwait1_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_cfg.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);
}
static void
tcp_session_reset (u32 conn_index, u32 thread_index)
{
tcp_connection_t *tc;
tc = tcp_connection_get (conn_index, thread_index);
session_transport_closed_notify (&tc->connection);
tcp_send_reset (tc);
tcp_connection_timers_reset (tc);
tcp_connection_set_state (tc, TCP_STATE_CLOSED);
tcp_timer_update (tc, TCP_TIMER_WAITCLOSE, tcp_cfg.cleanup_time);
}
/**
* 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 */
/**
* 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 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)
{
u8 ip_hdr_len;
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;
}
static void
tcp_init_mss (tcp_connection_t * tc)
{
u16 default_min_mss = 536;
tcp_init_rcv_mss (tc);
/* TODO consider PMTU discovery */
tc->snd_mss = clib_min (tc->rcv_opts.mss, tc->mss);
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)
{
/*
* 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 ()));
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 = 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_cfg.enable_tx_pacing)
tcp_enable_pacing (tc);
if (tc->flags & TCP_CONN_RATE_SAMPLE)
tcp_bt_init (tc);
tc->start_ts = tcp_time_now_us (tc->c_thread_index);
}
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_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
{
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));
}
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 (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)
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;
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);
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;
}
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_stats (u8 * s, va_list * args)
{
tcp_connection_t *tc = va_arg (*args, tcp_connection_t *);
u32 indent = format_get_indent (s);
s = format (s, "in segs %lu dsegs %lu bytes %lu dupacks %u\n",
tc->segs_in, tc->data_segs_in, tc->bytes_in, tc->dupacks_in);
s = format (s, "%Uout segs %lu dsegs %lu bytes %lu dupacks %u\n",
format_white_space, indent, tc->segs_out,
tc->data_segs_out, tc->bytes_out, tc->dupacks_out);
s = format (s, "%Ufr %u tr %u rxt segs %lu bytes %lu duration %.3f\n",
format_white_space, indent, tc->fr_occurences,
tc->tr_occurences, tc->segs_retrans, tc->bytes_retrans,
tcp_time_now_us (tc->c_thread_index) - tc->start_ts);
s = format (s, "%Uerr wnd data below %u above %u ack below %u above %u",
format_white_space, indent, tc->errors.below_data_wnd,
tc->errors.above_data_wnd, tc->errors.below_ack_wnd,
tc->errors.above_ack_wnd);
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);
s = format (s, " stats: %U\n", format_tcp_stats, 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 __clib_unused thread_index = 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);
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_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 is_reneging %u\n",
format_white_space, indent, sb->last_bytes_delivered,
sb->high_sacked - tc->iss, sb->is_reneging);
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);
if (PREDICT_FALSE (!tc))
return 0;
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;
}
static u16
tcp_session_cal_goal_size (tcp_connection_t * tc)
{
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;
}
/**
* 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);
if (PREDICT_FALSE (tc->is_tso))
{
return tcp_session_cal_goal_size (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_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,
.reset = tcp_session_reset,
.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,
.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 = {
.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;
transport_connection_tx_pacer_update (&tc->connection,
tcp_cc_get_pacing_rate (tc));
}
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_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_cfg.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_cfg.lastack_time);
/* Don't delete the connection yet */
break;
case TCP_STATE_FIN_WAIT_1:
tcp_connection_timers_reset (tc);
session_transport_closed_notify (&tc->connection);
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_timer_set (tc, TCP_TIMER_WAITCLOSE, tcp_cfg.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_cfg.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_cfg.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_waitclose_handler,
tcp_timer_retransmit_syn_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 (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,
TCP_TIMER_TICK, ~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 = tcp_cfg.preallocated_connections / n_workers;
for (thread = 0; thread < num_threads; thread++)
{
vec_validate (tm->wrk_ctx[thread].pending_deq_acked, 255);
vec_validate (tm->wrk_ctx[thread].pending_disconnects, 255);
vec_reset_length (tm->wrk_ctx[thread].pending_deq_acked);
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 (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;
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;
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;
}
/**
* 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.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 = 1; /* 0.1s */
}
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 ();
tcp_configuration_init ();
tm->cc_algo_by_name = hash_create_string (0, sizeof (uword));
return 0;
}
VLIB_INIT_FUNCTION (tcp_init);
uword
unformat_tcp_cc_algo (unformat_input_t * input, va_list * va)
{
tcp_cc_algorithm_type_e *result = va_arg (*va, tcp_cc_algorithm_type_e *);
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)
{
uword memory_size;
while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
{
if (unformat (input, "preallocated-connections %d",
&tcp_cfg.preallocated_connections))
;
else if (unformat (input, "preallocated-half-open-connections %d",
&tcp_cfg.preallocated_half_open_connections))
;
else if (unformat (input, "buffer-fail-fraction %f",
&tcp_cfg.buffer_fail_fraction))
;
else if (unformat (input, "max-rx-fifo %U", unformat_memory_size,
&memory_size))
tcp_cfg.max_rx_fifo = memory_size;
else if (unformat (input, "min-rx-fifo %U", unformat_memory_size,
&memory_size))
tcp_cfg.min_rx_fifo = memory_size;
else if (unformat (input, "mtu %u", &tcp_cfg.default_mtu))
;
else if (unformat (input, "rwnd-min-update-ack %d",
&tcp_cfg.rwnd_min_update_ack))
;
else if (unformat (input, "initial-cwnd-multiplier %u",
&tcp_cfg.initial_cwnd_multiplier))
;
else if (unformat (input, "no-tx-pacing"))
tcp_cfg.enable_tx_pacing = 0;
else if (unformat (input, "cc-algo %U", unformat_tcp_cc_algo,
&tcp_cfg.cc_algo))
;
else if (unformat (input, "%U", unformat_tcp_cc_algo_cfg))
;
else if (unformat (input, "closewait-time %u", &tcp_cfg.closewait_time))
tcp_cfg.closewait_time /= TCP_TIMER_TICK;
else if (unformat (input, "timewait-time %u", &tcp_cfg.timewait_time))
tcp_cfg.timewait_time /= TCP_TIMER_TICK;
else if (unformat (input, "finwait1-time %u", &tcp_cfg.finwait1_time))
tcp_cfg.finwait1_time /= TCP_TIMER_TICK;
else if (unformat (input, "finwait2-time %u", &tcp_cfg.finwait2_time))
tcp_cfg.finwait2_time /= TCP_TIMER_TICK;
else if (unformat (input, "lastack-time %u", &tcp_cfg.lastack_time))
tcp_cfg.lastack_time /= TCP_TIMER_TICK;
else if (unformat (input, "closing-time %u", &tcp_cfg.closing_time))
tcp_cfg.closing_time /= TCP_TIMER_TICK;
else if (unformat (input, "cleanup-time %u", &tcp_cfg.cleanup_time))
tcp_cfg.cleanup_time /= TCP_TIMER_TICK;
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)
{
vnet_main_t *vnm = vnet_get_main ();
u32 start_host_byte_order, end_host_byte_order;
fib_prefix_t prefix;
fib_node_index_t fei;
u32 fib_index = 0;
u32 sw_if_index;
int rv;
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);
/* Configure proxy arp across the range */
rv = vnet_proxy_arp_add_del (start, end, fib_index, 0 /* is_del */ );
if (rv)
return rv;
rv = vnet_proxy_arp_enable_disable (vnm, sw_if_index, 1);
if (rv)
return rv;
do
{
dpo_id_t dpo = DPO_INVALID;
vec_add1 (tcp_cfg.ip4_src_addrs, 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)
{
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 (tcp_cfg.ip6_src_addrs, 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;
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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