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/*
* Copyright (c) 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.
*/
#include <vnet/session/application_local.h>
#include <vnet/session/session.h>
static ct_connection_t *connections;
static void
ct_enable_disable_main_pre_input_node (u8 is_add)
{
u32 n_conns;
if (!vlib_num_workers ())
return;
n_conns = pool_elts (connections);
if (n_conns > 2)
return;
if (n_conns > 0 && is_add)
vlib_node_set_state (vlib_get_main (),
session_queue_pre_input_node.index,
VLIB_NODE_STATE_POLLING);
else if (n_conns == 0)
vlib_node_set_state (vlib_get_main (),
session_queue_pre_input_node.index,
VLIB_NODE_STATE_DISABLED);
}
static ct_connection_t *
ct_connection_alloc (void)
{
ct_connection_t *ct;
pool_get_zero (connections, ct);
ct->c_c_index = ct - connections;
ct->c_thread_index = 0;
ct->client_wrk = ~0;
ct->server_wrk = ~0;
return ct;
}
static ct_connection_t *
ct_connection_get (u32 ct_index)
{
if (pool_is_free_index (connections, ct_index))
return 0;
return pool_elt_at_index (connections, ct_index);
}
static void
ct_connection_free (ct_connection_t * ct)
{
if (CLIB_DEBUG)
memset (ct, 0xfc, sizeof (*ct));
pool_put (connections, ct);
}
session_t *
ct_session_get_peer (session_t * s)
{
ct_connection_t *ct, *peer_ct;
ct = ct_connection_get (s->connection_index);
peer_ct = ct_connection_get (ct->peer_index);
return session_get (peer_ct->c_s_index, 0);
}
void
ct_session_endpoint (session_t * ll, session_endpoint_t * sep)
{
ct_connection_t *ct;
ct = (ct_connection_t *) session_get_transport (ll);
sep->transport_proto = ct->actual_tp;
sep->port = ct->c_lcl_port;
sep->is_ip4 = ct->c_is_ip4;
ip_copy (&sep->ip, &ct->c_lcl_ip, ct->c_is_ip4);
}
int
ct_session_connect_notify (session_t * ss)
{
ct_connection_t *sct, *cct;
app_worker_t *client_wrk;
segment_manager_t *sm;
u32 ss_index, opaque;
fifo_segment_t *seg;
u64 segment_handle;
int err = 0;
session_t *cs;
ss_index = ss->session_index;
sct = (ct_connection_t *) session_get_transport (ss);
client_wrk = app_worker_get (sct->client_wrk);
opaque = sct->client_opaque;
sm = segment_manager_get (ss->rx_fifo->segment_manager);
seg = segment_manager_get_segment_w_lock (sm, ss->rx_fifo->segment_index);
segment_handle = segment_manager_segment_handle (sm, seg);
if ((err = app_worker_add_segment_notify (client_wrk, segment_handle)))
{
clib_warning ("failed to notify client %u of new segment",
sct->client_wrk);
segment_manager_segment_reader_unlock (sm);
session_close (ss);
goto error;
}
else
{
segment_manager_segment_reader_unlock (sm);
}
/* Alloc client session */
cct = ct_connection_get (sct->peer_index);
cs = session_alloc (0);
ss = session_get (ss_index, 0);
cs->session_type = ss->session_type;
cs->connection_index = sct->c_c_index;
cs->listener_handle = SESSION_INVALID_HANDLE;
cs->session_state = SESSION_STATE_CONNECTING;
cs->app_wrk_index = client_wrk->wrk_index;
cs->connection_index = cct->c_c_index;
cct->c_s_index = cs->session_index;
cct->client_rx_fifo = ss->tx_fifo;
cct->client_tx_fifo = ss->rx_fifo;
cct->client_rx_fifo->refcnt++;
cct->client_tx_fifo->refcnt++;
/* This will allocate fifos for the session. They won't be used for
* exchanging data but they will be used to close the connection if
* the segment manager/worker is freed */
if ((err = app_worker_init_connected (client_wrk, cs)))
{
session_close (ss);
session_free (cs);
goto error;
}
cs->session_state = SESSION_STATE_CONNECTING;
if (app_worker_connect_notify (client_wrk, cs, err, opaque))
{
session_close (ss);
segment_manager_dealloc_fifos (cs->rx_fifo, cs->tx_fifo);
session_free (cs);
return -1;
}
cs = session_get (cct->c_s_index, 0);
cs->session_state = SESSION_STATE_READY;
return 0;
error:
app_worker_connect_notify (client_wrk, 0, err, opaque);
return -1;
}
static int
ct_init_local_session (app_worker_t * client_wrk, app_worker_t * server_wrk,
ct_connection_t * ct, session_t * ls, session_t * ll)
{
u32 round_rx_fifo_sz, round_tx_fifo_sz, sm_index, seg_size;
segment_manager_props_t *props;
application_t *server;
segment_manager_t *sm;
u32 margin = 16 << 10;
fifo_segment_t *seg;
u64 segment_handle;
int seg_index, rv;
server = application_get (server_wrk->app_index);
props = application_segment_manager_properties (server);
round_rx_fifo_sz = 1 << max_log2 (props->rx_fifo_size);
round_tx_fifo_sz = 1 << max_log2 (props->tx_fifo_size);
/* Increase size because of inefficient chunk allocations. Depending on
* how data is consumed, it may happen that more chunks than needed are
* allocated.
* TODO should remove once allocations are done more efficiently */
seg_size = 4 * (round_rx_fifo_sz + round_tx_fifo_sz + margin);
sm = app_worker_get_listen_segment_manager (server_wrk, ll);
seg_index = segment_manager_add_segment (sm, seg_size);
if (seg_index < 0)
{
clib_warning ("failed to add new cut-through segment");
return seg_index;
}
seg = segment_manager_get_segment_w_lock (sm, seg_index);
rv = segment_manager_try_alloc_fifos (seg, ls->thread_index,
props->rx_fifo_size,
props->tx_fifo_size, &ls->rx_fifo,
&ls->tx_fifo);
if (rv)
{
clib_warning ("failed to add fifos in cut-through segment");
segment_manager_segment_reader_unlock (sm);
goto failed;
}
sm_index = segment_manager_index (sm);
ls->rx_fifo->master_session_index = ls->session_index;
ls->tx_fifo->master_session_index = ls->session_index;
ls->rx_fifo->segment_manager = sm_index;
ls->tx_fifo->segment_manager = sm_index;
ls->rx_fifo->segment_index = seg_index;
ls->tx_fifo->segment_index = seg_index;
segment_handle = segment_manager_segment_handle (sm, seg);
if ((rv = app_worker_add_segment_notify (server_wrk, segment_handle)))
{
clib_warning ("failed to notify server of new segment");
segment_manager_segment_reader_unlock (sm);
goto failed;
}
segment_manager_segment_reader_unlock (sm);
ct->segment_handle = segment_handle;
return 0;
failed:
segment_manager_del_segment (sm, seg);
return rv;
}
static int
ct_connect (app_worker_t * client_wrk, session_t * ll,
session_endpoint_cfg_t * sep)
{
u32 cct_index, ll_index, ll_ct_index;
ct_connection_t *sct, *cct, *ll_ct;
app_worker_t *server_wrk;
session_t *ss;
ll_index = ll->session_index;
ll_ct_index = ll->connection_index;
cct = ct_connection_alloc ();
cct_index = cct->c_c_index;
sct = ct_connection_alloc ();
ll_ct = ct_connection_get (ll_ct_index);
/*
* Alloc and init client transport
*/
cct = ct_connection_get (cct_index);
cct->c_thread_index = 0;
cct->c_rmt_port = sep->port;
cct->c_lcl_port = 0;
cct->c_is_ip4 = sep->is_ip4;
clib_memcpy (&cct->c_rmt_ip, &sep->ip, sizeof (sep->ip));
cct->actual_tp = ll_ct->actual_tp;
cct->is_client = 1;
/*
* Init server transport
*/
sct->c_thread_index = 0;
sct->c_rmt_port = 0;
sct->c_lcl_port = ll_ct->c_lcl_port;
sct->c_is_ip4 = sep->is_ip4;
clib_memcpy (&sct->c_lcl_ip, &ll_ct->c_lcl_ip, sizeof (ll_ct->c_lcl_ip));
sct->client_wrk = client_wrk->wrk_index;
sct->c_proto = TRANSPORT_PROTO_NONE;
sct->client_opaque = sep->opaque;
sct->actual_tp = ll_ct->actual_tp;
sct->peer_index = cct->c_c_index;
cct->peer_index = sct->c_c_index;
/*
* Accept server session. Client session is created only after
* server confirms accept.
*/
ss = session_alloc (0);
ll = listen_session_get (ll_index);
ss->session_type = session_type_from_proto_and_ip (TRANSPORT_PROTO_NONE,
sct->c_is_ip4);
ss->connection_index = sct->c_c_index;
ss->listener_handle = listen_session_get_handle (ll);
ss->session_state = SESSION_STATE_CREATED;
server_wrk = application_listener_select_worker (ll);
ss->app_wrk_index = server_wrk->wrk_index;
sct->c_s_index = ss->session_index;
sct->server_wrk = ss->app_wrk_index;
if (ct_init_local_session (client_wrk, server_wrk, sct, ss, ll))
{
ct_connection_free (sct);
session_free (ss);
return -1;
}
ss->session_state = SESSION_STATE_ACCEPTING;
if (app_worker_accept_notify (server_wrk, ss))
{
ct_connection_free (sct);
segment_manager_dealloc_fifos (ss->rx_fifo, ss->tx_fifo);
session_free (ss);
return -1;
}
cct->segment_handle = sct->segment_handle;
ct_enable_disable_main_pre_input_node (1 /* is_add */ );
return 0;
}
static u32
ct_start_listen (u32 app_listener_index, transport_endpoint_t * tep)
{
session_endpoint_cfg_t *sep;
ct_connection_t *ct;
sep = (session_endpoint_cfg_t *) tep;
ct = ct_connection_alloc ();
ct->server_wrk = sep->app_wrk_index;
ct->c_is_ip4 = sep->is_ip4;
clib_memcpy (&ct->c_lcl_ip, &sep->ip, sizeof (sep->ip));
ct->c_lcl_port = sep->port;
ct->actual_tp = sep->transport_proto;
ct_enable_disable_main_pre_input_node (1 /* is_add */ );
return ct->c_c_index;
}
static u32
ct_stop_listen (u32 ct_index)
{
ct_connection_t *ct;
ct = ct_connection_get (ct_index);
ct_connection_free (ct);
ct_enable_disable_main_pre_input_node (0 /* is_add */ );
return 0;
}
static transport_connection_t *
ct_listener_get (u32 ct_index)
{
return (transport_connection_t *) ct_connection_get (ct_index);
}
static int
ct_session_connect (transport_endpoint_cfg_t * tep)
{
session_endpoint_cfg_t *sep_ext;
session_endpoint_t *sep;
app_worker_t *app_wrk;
session_handle_t lh;
application_t *app;
app_listener_t *al;
u32 table_index;
session_t *ll;
u8 fib_proto;
sep_ext = (session_endpoint_cfg_t *) tep;
sep = (session_endpoint_t *) tep;
app_wrk = app_worker_get (sep_ext->app_wrk_index);
app = application_get (app_wrk->app_index);
sep->transport_proto = sep_ext->original_tp;
table_index = application_local_session_table (app);
lh = session_lookup_local_endpoint (table_index, sep);
if (lh == SESSION_DROP_HANDLE)
return SESSION_E_FILTERED;
if (lh == SESSION_INVALID_HANDLE)
goto global_scope;
ll = listen_session_get_from_handle (lh);
al = app_listener_get_w_session (ll);
/*
* Break loop if rule in local table points to connecting app. This
* can happen if client is a generic proxy. Route connect through
* global table instead.
*/
if (al->app_index == app->app_index)
goto global_scope;
return ct_connect (app_wrk, ll, sep_ext);
/*
* If nothing found, check the global scope for locally attached
* destinations. Make sure first that we're allowed to.
*/
global_scope:
if (session_endpoint_is_local (sep))
return SESSION_E_NOROUTE;
if (!application_has_global_scope (app))
return SESSION_E_SCOPE;
fib_proto = session_endpoint_fib_proto (sep);
table_index = session_lookup_get_index_for_fib (fib_proto, sep->fib_index);
ll = session_lookup_listener_wildcard (table_index, sep);
if (ll)
return ct_connect (app_wrk, ll, sep_ext);
/* Failed to connect but no error */
return 1;
}
static void
ct_session_close (u32 ct_index, u32 thread_index)
{
ct_connection_t *ct, *peer_ct;
app_worker_t *app_wrk;
session_t *s;
ct = ct_connection_get (ct_index);
peer_ct = ct_connection_get (ct->peer_index);
if (peer_ct)
{
peer_ct->peer_index = ~0;
session_transport_closing_notify (&peer_ct->connection);
}
s = session_get (ct->c_s_index, 0);
app_wrk = app_worker_get_if_valid (s->app_wrk_index);
if (app_wrk)
app_worker_del_segment_notify (app_wrk, ct->segment_handle);
session_free_w_fifos (s);
if (ct->is_client)
segment_manager_dealloc_fifos (ct->client_rx_fifo, ct->client_tx_fifo);
ct_connection_free (ct);
ct_enable_disable_main_pre_input_node (0 /* is_add */ );
}
static transport_connection_t *
ct_session_get (u32 ct_index, u32 thread_index)
{
return (transport_connection_t *) ct_connection_get (ct_index);
}
static u8 *
format_ct_connection_id (u8 * s, va_list * args)
{
ct_connection_t *ct = va_arg (*args, ct_connection_t *);
if (!ct)
return s;
if (ct->c_is_ip4)
{
s = format (s, "[%d:%d][CT:%U] %U:%d->%U:%d", ct->c_thread_index,
ct->c_s_index, format_transport_proto_short, ct->actual_tp,
format_ip4_address, &ct->c_lcl_ip4,
clib_net_to_host_u16 (ct->c_lcl_port), format_ip4_address,
&ct->c_rmt_ip4, clib_net_to_host_u16 (ct->c_rmt_port));
}
else
{
s = format (s, "[%d:%d][CT:%U] %U:%d->%U:%d", ct->c_thread_index,
ct->c_s_index, format_transport_proto_short, ct->actual_tp,
format_ip6_address, &ct->c_lcl_ip6,
clib_net_to_host_u16 (ct->c_lcl_port), format_ip6_address,
&ct->c_rmt_ip6, clib_net_to_host_u16 (ct->c_rmt_port));
}
return s;
}
static int
ct_custom_tx (void *session, transport_send_params_t * sp)
{
session_t *s = (session_t *) session;
if (session_has_transport (s))
return 0;
/* As all other sessions, cut-throughs are scheduled by vpp for tx so let
* the scheduler's custom tx logic decide when to deschedule, i.e., after
* fifo is emptied. */
return ct_session_tx (s);
}
static int
ct_app_rx_evt (transport_connection_t * tc)
{
ct_connection_t *ct = (ct_connection_t *) tc, *peer_ct;
session_t *ps;
peer_ct = ct_connection_get (ct->peer_index);
if (!peer_ct)
return -1;
ps = session_get (peer_ct->c_s_index, peer_ct->c_thread_index);
return session_dequeue_notify (ps);
}
static u8 *
format_ct_listener (u8 * s, va_list * args)
{
u32 tc_index = va_arg (*args, u32);
u32 __clib_unused thread_index = va_arg (*args, u32);
u32 __clib_unused verbose = va_arg (*args, u32);
ct_connection_t *ct = ct_connection_get (tc_index);
s = format (s, "%-50U", format_ct_connection_id, ct);
if (verbose)
s = format (s, "%-15s", "LISTEN");
return s;
}
static u8 *
format_ct_connection (u8 * s, va_list * args)
{
ct_connection_t *ct = va_arg (*args, ct_connection_t *);
u32 verbose = va_arg (*args, u32);
if (!ct)
return s;
s = format (s, "%-50U", format_ct_connection_id, ct);
if (verbose)
{
s = format (s, "%-15s", "ESTABLISHED");
if (verbose > 1)
{
s = format (s, "\n");
}
}
return s;
}
static u8 *
format_ct_session (u8 * s, va_list * args)
{
u32 ct_index = va_arg (*args, u32);
u32 __clib_unused thread_index = va_arg (*args, u32);
u32 verbose = va_arg (*args, u32);
ct_connection_t *ct;
ct = ct_connection_get (ct_index);
if (!ct)
{
s = format (s, "empty\n");
return s;
}
s = format (s, "%U", format_ct_connection, ct, verbose);
return s;
}
/* *INDENT-OFF* */
static const transport_proto_vft_t cut_thru_proto = {
.start_listen = ct_start_listen,
.stop_listen = ct_stop_listen,
.get_listener = ct_listener_get,
.connect = ct_session_connect,
.close = ct_session_close,
.get_connection = ct_session_get,
.custom_tx = ct_custom_tx,
.app_rx_evt = ct_app_rx_evt,
.format_listener = format_ct_listener,
.format_connection = format_ct_session,
.transport_options = {
.name = "ct",
.short_name = "C",
.tx_type = TRANSPORT_TX_INTERNAL,
.service_type = TRANSPORT_SERVICE_APP,
},
};
/* *INDENT-ON* */
int
ct_session_tx (session_t * s)
{
ct_connection_t *ct, *peer_ct;
session_t *peer_s;
ct = (ct_connection_t *) session_get_transport (s);
peer_ct = ct_connection_get (ct->peer_index);
if (!peer_ct)
return 0;
peer_s = session_get (peer_ct->c_s_index, 0);
if (peer_s->session_state >= SESSION_STATE_TRANSPORT_CLOSING)
return 0;
session_enqueue_notify (peer_s);
/* The scheduler uses packet count as a means of upper bounding the amount
* of work done per dispatch. So make it look like we have sent something */
return 1;
}
static clib_error_t *
ct_transport_init (vlib_main_t * vm)
{
transport_register_protocol (TRANSPORT_PROTO_NONE, &cut_thru_proto,
FIB_PROTOCOL_IP4, ~0);
transport_register_protocol (TRANSPORT_PROTO_NONE, &cut_thru_proto,
FIB_PROTOCOL_IP6, ~0);
return 0;
}
VLIB_INIT_FUNCTION (ct_transport_init);
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/