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/*
* Copyright (c) 2017 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 Session and session manager
*/
#include <vnet/session/session.h>
#include <vlibmemory/api.h>
#include <vnet/dpo/load_balance.h>
#include <vnet/fib/ip4_fib.h>
#include <vnet/session/application.h>
#include <vnet/tcp/tcp.h>
#include <vnet/session/session_debug.h>
/**
* Per-type vector of transport protocol virtual function tables
*/
static transport_proto_vft_t *tp_vfts;
session_manager_main_t session_manager_main;
/*
* Session lookup key; (src-ip, dst-ip, src-port, dst-port, session-type)
* Value: (owner thread index << 32 | session_index);
*/
void
stream_session_table_add_for_tc (transport_connection_t * tc, u64 value)
{
session_manager_main_t *smm = &session_manager_main;
session_kv4_t kv4;
session_kv6_t kv6;
switch (tc->proto)
{
case SESSION_TYPE_IP4_UDP:
case SESSION_TYPE_IP4_TCP:
make_v4_ss_kv_from_tc (&kv4, tc);
kv4.value = value;
clib_bihash_add_del_16_8 (&smm->v4_session_hash, &kv4, 1 /* is_add */ );
break;
case SESSION_TYPE_IP6_UDP:
case SESSION_TYPE_IP6_TCP:
make_v6_ss_kv_from_tc (&kv6, tc);
kv6.value = value;
clib_bihash_add_del_48_8 (&smm->v6_session_hash, &kv6, 1 /* is_add */ );
break;
default:
clib_warning ("Session type not supported");
ASSERT (0);
}
}
void
stream_session_table_add (session_manager_main_t * smm, stream_session_t * s,
u64 value)
{
transport_connection_t *tc;
tc = tp_vfts[s->session_type].get_connection (s->connection_index,
s->thread_index);
stream_session_table_add_for_tc (tc, value);
}
static void
stream_session_half_open_table_add (session_type_t sst,
transport_connection_t * tc, u64 value)
{
session_manager_main_t *smm = &session_manager_main;
session_kv4_t kv4;
session_kv6_t kv6;
switch (sst)
{
case SESSION_TYPE_IP4_UDP:
case SESSION_TYPE_IP4_TCP:
make_v4_ss_kv_from_tc (&kv4, tc);
kv4.value = value;
clib_bihash_add_del_16_8 (&smm->v4_half_open_hash, &kv4,
1 /* is_add */ );
break;
case SESSION_TYPE_IP6_UDP:
case SESSION_TYPE_IP6_TCP:
make_v6_ss_kv_from_tc (&kv6, tc);
kv6.value = value;
clib_bihash_add_del_48_8 (&smm->v6_half_open_hash, &kv6,
1 /* is_add */ );
break;
default:
clib_warning ("Session type not supported");
ASSERT (0);
}
}
int
stream_session_table_del_for_tc (transport_connection_t * tc)
{
session_manager_main_t *smm = &session_manager_main;
session_kv4_t kv4;
session_kv6_t kv6;
switch (tc->proto)
{
case SESSION_TYPE_IP4_UDP:
case SESSION_TYPE_IP4_TCP:
make_v4_ss_kv_from_tc (&kv4, tc);
return clib_bihash_add_del_16_8 (&smm->v4_session_hash, &kv4,
0 /* is_add */ );
break;
case SESSION_TYPE_IP6_UDP:
case SESSION_TYPE_IP6_TCP:
make_v6_ss_kv_from_tc (&kv6, tc);
return clib_bihash_add_del_48_8 (&smm->v6_session_hash, &kv6,
0 /* is_add */ );
break;
default:
clib_warning ("Session type not supported");
ASSERT (0);
}
return 0;
}
static int
stream_session_table_del (session_manager_main_t * smm, stream_session_t * s)
{
transport_connection_t *ts;
ts = tp_vfts[s->session_type].get_connection (s->connection_index,
s->thread_index);
return stream_session_table_del_for_tc (ts);
}
static void
stream_session_half_open_table_del (session_manager_main_t * smm, u8 sst,
transport_connection_t * tc)
{
session_kv4_t kv4;
session_kv6_t kv6;
switch (sst)
{
case SESSION_TYPE_IP4_UDP:
case SESSION_TYPE_IP4_TCP:
make_v4_ss_kv_from_tc (&kv4, tc);
clib_bihash_add_del_16_8 (&smm->v4_half_open_hash, &kv4,
0 /* is_add */ );
break;
case SESSION_TYPE_IP6_UDP:
case SESSION_TYPE_IP6_TCP:
make_v6_ss_kv_from_tc (&kv6, tc);
clib_bihash_add_del_48_8 (&smm->v6_half_open_hash, &kv6,
0 /* is_add */ );
break;
default:
clib_warning ("Session type not supported");
ASSERT (0);
}
}
stream_session_t *
stream_session_lookup_listener4 (ip4_address_t * lcl, u16 lcl_port, u8 proto)
{
session_manager_main_t *smm = &session_manager_main;
session_kv4_t kv4;
int rv;
make_v4_listener_kv (&kv4, lcl, lcl_port, proto);
rv = clib_bihash_search_inline_16_8 (&smm->v4_session_hash, &kv4);
if (rv == 0)
return pool_elt_at_index (smm->listen_sessions[proto], (u32) kv4.value);
/* Zero out the lcl ip */
kv4.key[0] = 0;
rv = clib_bihash_search_inline_16_8 (&smm->v4_session_hash, &kv4);
if (rv == 0)
return pool_elt_at_index (smm->listen_sessions[proto], kv4.value);
return 0;
}
/** Looks up a session based on the 5-tuple passed as argument.
*
* First it tries to find an established session, if this fails, it tries
* finding a listener session if this fails, it tries a lookup with a
* wildcarded local source (listener bound to all interfaces)
*/
stream_session_t *
stream_session_lookup4 (ip4_address_t * lcl, ip4_address_t * rmt,
u16 lcl_port, u16 rmt_port, u8 proto,
u32 my_thread_index)
{
session_manager_main_t *smm = &session_manager_main;
session_kv4_t kv4;
int rv;
/* Lookup session amongst established ones */
make_v4_ss_kv (&kv4, lcl, rmt, lcl_port, rmt_port, proto);
rv = clib_bihash_search_inline_16_8 (&smm->v4_session_hash, &kv4);
if (rv == 0)
return stream_session_get_tsi (kv4.value, my_thread_index);
/* If nothing is found, check if any listener is available */
return stream_session_lookup_listener4 (lcl, lcl_port, proto);
}
stream_session_t *
stream_session_lookup_listener6 (ip6_address_t * lcl, u16 lcl_port, u8 proto)
{
session_manager_main_t *smm = &session_manager_main;
session_kv6_t kv6;
int rv;
make_v6_listener_kv (&kv6, lcl, lcl_port, proto);
rv = clib_bihash_search_inline_48_8 (&smm->v6_session_hash, &kv6);
if (rv == 0)
return pool_elt_at_index (smm->listen_sessions[proto], kv6.value);
/* Zero out the lcl ip */
kv6.key[0] = kv6.key[1] = 0;
rv = clib_bihash_search_inline_48_8 (&smm->v6_session_hash, &kv6);
if (rv == 0)
return pool_elt_at_index (smm->listen_sessions[proto], kv6.value);
return 0;
}
/* Looks up a session based on the 5-tuple passed as argument.
* First it tries to find an established session, if this fails, it tries
* finding a listener session if this fails, it tries a lookup with a
* wildcarded local source (listener bound to all interfaces) */
stream_session_t *
stream_session_lookup6 (ip6_address_t * lcl, ip6_address_t * rmt,
u16 lcl_port, u16 rmt_port, u8 proto,
u32 my_thread_index)
{
session_manager_main_t *smm = vnet_get_session_manager_main ();
session_kv6_t kv6;
int rv;
make_v6_ss_kv (&kv6, lcl, rmt, lcl_port, rmt_port, proto);
rv = clib_bihash_search_inline_48_8 (&smm->v6_session_hash, &kv6);
if (rv == 0)
return stream_session_get_tsi (kv6.value, my_thread_index);
/* If nothing is found, check if any listener is available */
return stream_session_lookup_listener6 (lcl, lcl_port, proto);
}
stream_session_t *
stream_session_lookup_listener (ip46_address_t * lcl, u16 lcl_port, u8 proto)
{
switch (proto)
{
case SESSION_TYPE_IP4_UDP:
case SESSION_TYPE_IP4_TCP:
return stream_session_lookup_listener4 (&lcl->ip4, lcl_port, proto);
break;
case SESSION_TYPE_IP6_UDP:
case SESSION_TYPE_IP6_TCP:
return stream_session_lookup_listener6 (&lcl->ip6, lcl_port, proto);
break;
}
return 0;
}
static u64
stream_session_half_open_lookup (session_manager_main_t * smm,
ip46_address_t * lcl, ip46_address_t * rmt,
u16 lcl_port, u16 rmt_port, u8 proto)
{
session_kv4_t kv4;
session_kv6_t kv6;
int rv;
switch (proto)
{
case SESSION_TYPE_IP4_UDP:
case SESSION_TYPE_IP4_TCP:
make_v4_ss_kv (&kv4, &lcl->ip4, &rmt->ip4, lcl_port, rmt_port, proto);
rv = clib_bihash_search_inline_16_8 (&smm->v4_half_open_hash, &kv4);
if (rv == 0)
return kv4.value;
return (u64) ~ 0;
break;
case SESSION_TYPE_IP6_UDP:
case SESSION_TYPE_IP6_TCP:
make_v6_ss_kv (&kv6, &lcl->ip6, &rmt->ip6, lcl_port, rmt_port, proto);
rv = clib_bihash_search_inline_48_8 (&smm->v6_half_open_hash, &kv6);
if (rv == 0)
return kv6.value;
return (u64) ~ 0;
break;
}
return 0;
}
transport_connection_t *
stream_session_lookup_transport4 (ip4_address_t * lcl, ip4_address_t * rmt,
u16 lcl_port, u16 rmt_port, u8 proto,
u32 my_thread_index)
{
session_manager_main_t *smm = &session_manager_main;
session_kv4_t kv4;
stream_session_t *s;
int rv;
/* Lookup session amongst established ones */
make_v4_ss_kv (&kv4, lcl, rmt, lcl_port, rmt_port, proto);
rv = clib_bihash_search_inline_16_8 (&smm->v4_session_hash, &kv4);
if (rv == 0)
{
s = stream_session_get_tsi (kv4.value, my_thread_index);
return tp_vfts[s->session_type].get_connection (s->connection_index,
my_thread_index);
}
/* If nothing is found, check if any listener is available */
s = stream_session_lookup_listener4 (lcl, lcl_port, proto);
if (s)
return tp_vfts[s->session_type].get_listener (s->connection_index);
/* Finally, try half-open connections */
rv = clib_bihash_search_inline_16_8 (&smm->v4_half_open_hash, &kv4);
if (rv == 0)
return tp_vfts[proto].get_half_open (kv4.value & 0xFFFFFFFF);
return 0;
}
transport_connection_t *
stream_session_lookup_transport6 (ip6_address_t * lcl, ip6_address_t * rmt,
u16 lcl_port, u16 rmt_port, u8 proto,
u32 my_thread_index)
{
session_manager_main_t *smm = &session_manager_main;
stream_session_t *s;
session_kv6_t kv6;
int rv;
make_v6_ss_kv (&kv6, lcl, rmt, lcl_port, rmt_port, proto);
rv = clib_bihash_search_inline_48_8 (&smm->v6_session_hash, &kv6);
if (rv == 0)
{
s = stream_session_get_tsi (kv6.value, my_thread_index);
return tp_vfts[s->session_type].get_connection (s->connection_index,
my_thread_index);
}
/* If nothing is found, check if any listener is available */
s = stream_session_lookup_listener6 (lcl, lcl_port, proto);
if (s)
return tp_vfts[s->session_type].get_listener (s->connection_index);
/* Finally, try half-open connections */
rv = clib_bihash_search_inline_48_8 (&smm->v6_half_open_hash, &kv6);
if (rv == 0)
return tp_vfts[proto].get_half_open (kv6.value & 0xFFFFFFFF);
return 0;
}
int
stream_session_create_i (segment_manager_t * sm, transport_connection_t * tc,
stream_session_t ** ret_s)
{
session_manager_main_t *smm = &session_manager_main;
svm_fifo_t *server_rx_fifo = 0, *server_tx_fifo = 0;
u32 fifo_segment_index;
u32 pool_index;
stream_session_t *s;
u64 value;
u32 thread_index = tc->thread_index;
int rv;
if ((rv = segment_manager_alloc_session_fifos (sm, &server_rx_fifo,
&server_tx_fifo,
&fifo_segment_index)))
return rv;
/* Create the session */
pool_get_aligned (smm->sessions[thread_index], s, CLIB_CACHE_LINE_BYTES);
memset (s, 0, sizeof (*s));
/* Initialize backpointers */
pool_index = s - smm->sessions[thread_index];
server_rx_fifo->master_session_index = pool_index;
server_rx_fifo->master_thread_index = thread_index;
server_tx_fifo->master_session_index = pool_index;
server_tx_fifo->master_thread_index = thread_index;
s->server_rx_fifo = server_rx_fifo;
s->server_tx_fifo = server_tx_fifo;
/* Initialize state machine, such as it is... */
s->session_type = tc->proto;
s->session_state = SESSION_STATE_CONNECTING;
s->svm_segment_index = fifo_segment_index;
s->thread_index = thread_index;
s->session_index = pool_index;
/* Attach transport to session */
s->connection_index = tc->c_index;
/* Attach session to transport */
tc->s_index = s->session_index;
/* Add to the main lookup table */
value = (((u64) thread_index) << 32) | (u64) s->session_index;
stream_session_table_add_for_tc (tc, value);
*ret_s = s;
return 0;
}
/** Enqueue buffer chain tail */
always_inline int
session_enqueue_chain_tail (stream_session_t * s, vlib_buffer_t * b,
u32 offset, u8 is_in_order)
{
vlib_buffer_t *chain_b;
u32 chain_bi = b->next_buffer;
vlib_main_t *vm = vlib_get_main ();
u8 *data, len;
u16 written = 0;
int rv = 0;
do
{
chain_b = vlib_get_buffer (vm, chain_bi);
data = vlib_buffer_get_current (chain_b);
len = chain_b->current_length;
if (is_in_order)
{
rv = svm_fifo_enqueue_nowait (s->server_rx_fifo, len, data);
if (rv < len)
{
return (rv > 0) ? (written + rv) : written;
}
written += rv;
}
else
{
rv = svm_fifo_enqueue_with_offset (s->server_rx_fifo, offset, len,
data);
if (rv)
return -1;
offset += len;
}
}
while ((chain_bi = (chain_b->flags & VLIB_BUFFER_NEXT_PRESENT)
? chain_b->next_buffer : 0));
if (is_in_order)
return written;
return 0;
}
/*
* Enqueue data for delivery to session peer. Does not notify peer of enqueue
* event but on request can queue notification events for later delivery by
* calling stream_server_flush_enqueue_events().
*
* @param tc Transport connection which is to be enqueued data
* @param b Buffer to be enqueued
* @param offset Offset at which to start enqueueing if out-of-order
* @param queue_event Flag to indicate if peer is to be notified or if event
* is to be queued. The former is useful when more data is
* enqueued and only one event is to be generated.
* @param is_in_order Flag to indicate if data is in order
* @return Number of bytes enqueued or a negative value if enqueueing failed.
*/
int
stream_session_enqueue_data (transport_connection_t * tc, vlib_buffer_t * b,
u32 offset, u8 queue_event, u8 is_in_order)
{
stream_session_t *s;
int enqueued = 0, rv;
s = stream_session_get (tc->s_index, tc->thread_index);
if (is_in_order)
{
enqueued =
svm_fifo_enqueue_nowait (s->server_rx_fifo, b->current_length,
vlib_buffer_get_current (b));
if (PREDICT_FALSE
((b->flags & VLIB_BUFFER_NEXT_PRESENT) && enqueued > 0))
{
rv = session_enqueue_chain_tail (s, b, 0, 1);
if (rv <= 0)
return enqueued;
enqueued += rv;
}
}
else
{
rv = svm_fifo_enqueue_with_offset (s->server_rx_fifo, offset,
b->current_length,
vlib_buffer_get_current (b));
if (PREDICT_FALSE ((b->flags & VLIB_BUFFER_NEXT_PRESENT) && !rv))
rv = session_enqueue_chain_tail (s, b, offset + b->current_length, 0);
if (rv)
return -1;
}
if (queue_event)
{
/* Queue RX event on this fifo. Eventually these will need to be flushed
* by calling stream_server_flush_enqueue_events () */
session_manager_main_t *smm = vnet_get_session_manager_main ();
u32 thread_index = s->thread_index;
u32 my_enqueue_epoch = smm->current_enqueue_epoch[thread_index];
if (s->enqueue_epoch != my_enqueue_epoch)
{
s->enqueue_epoch = my_enqueue_epoch;
vec_add1 (smm->session_indices_to_enqueue_by_thread[thread_index],
s - smm->sessions[thread_index]);
}
}
if (is_in_order)
return enqueued;
return 0;
}
/** Check if we have space in rx fifo to push more bytes */
u8
stream_session_no_space (transport_connection_t * tc, u32 thread_index,
u16 data_len)
{
stream_session_t *s = stream_session_get (tc->c_index, thread_index);
if (PREDICT_FALSE (s->session_state != SESSION_STATE_READY))
return 1;
if (data_len > svm_fifo_max_enqueue (s->server_rx_fifo))
return 1;
return 0;
}
u32
stream_session_peek_bytes (transport_connection_t * tc, u8 * buffer,
u32 offset, u32 max_bytes)
{
stream_session_t *s = stream_session_get (tc->s_index, tc->thread_index);
return svm_fifo_peek (s->server_tx_fifo, offset, max_bytes, buffer);
}
u32
stream_session_dequeue_drop (transport_connection_t * tc, u32 max_bytes)
{
stream_session_t *s = stream_session_get (tc->s_index, tc->thread_index);
return svm_fifo_dequeue_drop (s->server_tx_fifo, max_bytes);
}
/**
* Notify session peer that new data has been enqueued.
*
* @param s Stream session for which the event is to be generated.
* @param block Flag to indicate if call should block if event queue is full.
*
* @return 0 on succes or negative number if failed to send notification.
*/
static int
stream_session_enqueue_notify (stream_session_t * s, u8 block)
{
application_t *app;
session_fifo_event_t evt;
unix_shared_memory_queue_t *q;
static u32 serial_number;
if (PREDICT_FALSE (s->session_state == SESSION_STATE_CLOSED))
return 0;
/* Get session's server */
app = application_get (s->app_index);
/* Built-in server? Hand event to the callback... */
if (app->cb_fns.builtin_server_rx_callback)
return app->cb_fns.builtin_server_rx_callback (s);
/* If no event, send one */
if (svm_fifo_set_event (s->server_rx_fifo))
{
/* Fabricate event */
evt.fifo = s->server_rx_fifo;
evt.event_type = FIFO_EVENT_APP_RX;
evt.event_id = serial_number++;
/* Add event to server's event queue */
q = app->event_queue;
/* Based on request block (or not) for lack of space */
if (block || PREDICT_TRUE (q->cursize < q->maxsize))
unix_shared_memory_queue_add (app->event_queue, (u8 *) & evt,
0 /* do wait for mutex */ );
else
{
clib_warning ("fifo full");
return -1;
}
}
/* *INDENT-OFF* */
SESSION_EVT_DBG(SESSION_EVT_ENQ, s, ({
ed->data[0] = evt.event_id;
ed->data[1] = svm_fifo_max_dequeue (s->server_rx_fifo);
}));
/* *INDENT-ON* */
return 0;
}
/**
* Flushes queue of sessions that are to be notified of new data
* enqueued events.
*
* @param thread_index Thread index for which the flush is to be performed.
* @return 0 on success or a positive number indicating the number of
* failures due to API queue being full.
*/
int
session_manager_flush_enqueue_events (u32 thread_index)
{
session_manager_main_t *smm = &session_manager_main;
u32 *session_indices_to_enqueue;
int i, errors = 0;
session_indices_to_enqueue =
smm->session_indices_to_enqueue_by_thread[thread_index];
for (i = 0; i < vec_len (session_indices_to_enqueue); i++)
{
stream_session_t *s0;
/* Get session */
s0 = stream_session_get (session_indices_to_enqueue[i], thread_index);
if (stream_session_enqueue_notify (s0, 0 /* don't block */ ))
{
errors++;
}
}
vec_reset_length (session_indices_to_enqueue);
smm->session_indices_to_enqueue_by_thread[thread_index] =
session_indices_to_enqueue;
/* Increment enqueue epoch for next round */
smm->current_enqueue_epoch[thread_index]++;
return errors;
}
/**
* Init fifo tail and head pointers
*
* Useful if transport uses absolute offsets for tracking ooo segments.
*/
void
stream_session_init_fifos_pointers (transport_connection_t * tc,
u32 rx_pointer, u32 tx_pointer)
{
stream_session_t *s;
s = stream_session_get (tc->s_index, tc->thread_index);
svm_fifo_init_pointers (s->server_rx_fifo, rx_pointer);
svm_fifo_init_pointers (s->server_tx_fifo, tx_pointer);
}
void
stream_session_connect_notify (transport_connection_t * tc, u8 sst,
u8 is_fail)
{
session_manager_main_t *smm = &session_manager_main;
application_t *app;
stream_session_t *new_s = 0;
u64 handle;
u32 api_context = 0;
handle = stream_session_half_open_lookup (smm, &tc->lcl_ip, &tc->rmt_ip,
tc->lcl_port, tc->rmt_port,
tc->proto);
if (handle == HALF_OPEN_LOOKUP_INVALID_VALUE)
{
clib_warning ("This can't be good!");
return;
}
/* Get the app's index from the handle we stored when opening connection */
app = application_get (handle >> 32);
api_context = tc->s_index;
if (!is_fail)
{
segment_manager_t *sm;
sm = application_get_connect_segment_manager (app);
/* Create new session (svm segments are allocated if needed) */
if (stream_session_create_i (sm, tc, &new_s))
return;
new_s->app_index = app->index;
}
/* Notify client */
app->cb_fns.session_connected_callback (app->index, api_context, new_s,
is_fail);
/* Cleanup session lookup */
stream_session_half_open_table_del (smm, sst, tc);
}
void
stream_session_accept_notify (transport_connection_t * tc)
{
application_t *server;
stream_session_t *s;
s = stream_session_get (tc->s_index, tc->thread_index);
server = application_get (s->app_index);
server->cb_fns.session_accept_callback (s);
}
/**
* Notification from transport that connection is being closed.
*
* A disconnect is sent to application but state is not removed. Once
* disconnect is acknowledged by application, session disconnect is called.
* Ultimately this leads to close being called on transport (passive close).
*/
void
stream_session_disconnect_notify (transport_connection_t * tc)
{
application_t *server;
stream_session_t *s;
s = stream_session_get (tc->s_index, tc->thread_index);
server = application_get (s->app_index);
server->cb_fns.session_disconnect_callback (s);
}
/**
* Cleans up session and associated app if needed.
*/
void
stream_session_delete (stream_session_t * s)
{
session_manager_main_t *smm = vnet_get_session_manager_main ();
/* Delete from the main lookup table. */
stream_session_table_del (smm, s);
/* Cleanup fifo segments */
segment_manager_dealloc_fifos (s->svm_segment_index, s->server_rx_fifo,
s->server_tx_fifo);
pool_put (smm->sessions[s->thread_index], s);
}
/**
* Notification from transport that connection is being deleted
*
* This should be called only on previously fully established sessions. For
* instance failed connects should call stream_session_connect_notify and
* indicate that the connect has failed.
*/
void
stream_session_delete_notify (transport_connection_t * tc)
{
stream_session_t *s;
/* App might've been removed already */
s = stream_session_get_if_valid (tc->s_index, tc->thread_index);
if (!s)
{
return;
}
stream_session_delete (s);
}
/**
* Notify application that connection has been reset.
*/
void
stream_session_reset_notify (transport_connection_t * tc)
{
stream_session_t *s;
application_t *app;
s = stream_session_get (tc->s_index, tc->thread_index);
app = application_get (s->app_index);
app->cb_fns.session_reset_callback (s);
}
/**
* Accept a stream session. Optionally ping the server by callback.
*/
int
stream_session_accept (transport_connection_t * tc, u32 listener_index,
u8 sst, u8 notify)
{
application_t *server;
stream_session_t *s, *listener;
segment_manager_t *sm;
int rv;
/* Find the server */
listener = listen_session_get (sst, listener_index);
server = application_get (listener->app_index);
sm = application_get_listen_segment_manager (server, listener);
if ((rv = stream_session_create_i (sm, tc, &s)))
return rv;
s->app_index = server->index;
s->listener_index = listener_index;
/* Shoulder-tap the server */
if (notify)
{
server->cb_fns.session_accept_callback (s);
}
return 0;
}
/**
* Ask transport to open connection to remote transport endpoint.
*
* Stores handle for matching request with reply since the call can be
* asynchronous. For instance, for TCP the 3-way handshake must complete
* before reply comes. Session is only created once connection is established.
*
* @param app_index Index of the application requesting the connect
* @param st Session type requested.
* @param tep Remote transport endpoint
* @param res Resulting transport connection .
*/
int
stream_session_open (u32 app_index, session_type_t st,
transport_endpoint_t * tep,
transport_connection_t ** res)
{
transport_connection_t *tc;
int rv;
u64 handle;
rv = tp_vfts[st].open (&tep->ip, tep->port);
if (rv < 0)
{
clib_warning ("Transport failed to open connection.");
return VNET_API_ERROR_SESSION_CONNECT_FAIL;
}
tc = tp_vfts[st].get_half_open ((u32) rv);
/* Save app and tc index. The latter is needed to help establish the
* connection while the former is needed when the connect notify comes
* and we have to notify the external app */
handle = (((u64) app_index) << 32) | (u64) tc->c_index;
/* Add to the half-open lookup table */
stream_session_half_open_table_add (st, tc, handle);
*res = tc;
return 0;
}
/**
* Ask transport to listen on local transport endpoint.
*
* @param s Session for which listen will be called. Note that unlike
* established sessions, listen sessions are not associated to a
* thread.
* @param tep Local endpoint to be listened on.
*/
int
stream_session_listen (stream_session_t * s, transport_endpoint_t * tep)
{
transport_connection_t *tc;
u32 tci;
/* Transport bind/listen */
tci = tp_vfts[s->session_type].bind (s->session_index, &tep->ip, tep->port);
if (tci == (u32) ~ 0)
return -1;
/* Attach transport to session */
s->connection_index = tci;
tc = tp_vfts[s->session_type].get_listener (tci);
/* Weird but handle it ... */
if (tc == 0)
return -1;
/* Add to the main lookup table */
stream_session_table_add_for_tc (tc, s->session_index);
return 0;
}
/**
* Ask transport to stop listening on local transport endpoint.
*
* @param s Session to stop listening on. It must be in state LISTENING.
*/
int
stream_session_stop_listen (stream_session_t * s)
{
transport_connection_t *tc;
if (s->session_state != SESSION_STATE_LISTENING)
{
clib_warning ("not a listening session");
return -1;
}
tc = tp_vfts[s->session_type].get_listener (s->connection_index);
if (!tc)
{
clib_warning ("no transport");
return VNET_API_ERROR_ADDRESS_NOT_IN_USE;
}
stream_session_table_del_for_tc (tc);
tp_vfts[s->session_type].unbind (s->connection_index);
return 0;
}
void
session_send_session_evt_to_thread (u64 session_handle,
fifo_event_type_t evt_type,
u32 thread_index)
{
static u16 serial_number = 0;
session_fifo_event_t evt;
unix_shared_memory_queue_t *q;
/* Fabricate event */
evt.session_handle = session_handle;
evt.event_type = evt_type;
evt.event_id = serial_number++;
q = session_manager_get_vpp_event_queue (thread_index);
/* Based on request block (or not) for lack of space */
if (PREDICT_TRUE (q->cursize < q->maxsize))
unix_shared_memory_queue_add (q, (u8 *) & evt,
0 /* do wait for mutex */ );
else
{
clib_warning ("queue full");
return;
}
}
/**
* Disconnect session and propagate to transport. This should eventually
* result in a delete notification that allows us to cleanup session state.
* Called for both active/passive disconnects.
*
* Should be called from the session's thread.
*/
void
stream_session_disconnect (stream_session_t * s)
{
s->session_state = SESSION_STATE_CLOSED;
tp_vfts[s->session_type].close (s->connection_index, s->thread_index);
}
/**
* Cleanup transport and session state.
*
* Notify transport of the cleanup, wait for a delete notify to actually
* remove the session state.
*/
void
stream_session_cleanup (stream_session_t * s)
{
session_manager_main_t *smm = &session_manager_main;
int rv;
s->session_state = SESSION_STATE_CLOSED;
/* Delete from the main lookup table to avoid more enqueues */
rv = stream_session_table_del (smm, s);
if (rv)
clib_warning ("hash delete error, rv %d", rv);
tp_vfts[s->session_type].cleanup (s->connection_index, s->thread_index);
}
void
session_register_transport (u8 type, const transport_proto_vft_t * vft)
{
session_manager_main_t *smm = vnet_get_session_manager_main ();
vec_validate (tp_vfts, type);
tp_vfts[type] = *vft;
/* If an offset function is provided, then peek instead of dequeue */
smm->session_tx_fns[type] =
(vft->tx_fifo_offset) ? session_tx_fifo_peek_and_snd :
session_tx_fifo_dequeue_and_snd;
}
transport_proto_vft_t *
session_get_transport_vft (u8 type)
{
if (type >= vec_len (tp_vfts))
return 0;
return &tp_vfts[type];
}
/**
* Allocate vpp event queue (once) per worker thread
*/
void
session_vpp_event_queue_allocate (session_manager_main_t * smm,
u32 thread_index)
{
api_main_t *am = &api_main;
void *oldheap;
u32 event_queue_length = 2048;
if (smm->vpp_event_queues[thread_index] == 0)
{
/* Allocate event fifo in the /vpe-api shared-memory segment */
oldheap = svm_push_data_heap (am->vlib_rp);
if (smm->configured_event_queue_length)
event_queue_length = smm->configured_event_queue_length;
smm->vpp_event_queues[thread_index] =
unix_shared_memory_queue_init
(event_queue_length,
sizeof (session_fifo_event_t), 0 /* consumer pid */ ,
0 /* (do not) send signal when queue non-empty */ );
svm_pop_heap (oldheap);
}
}
static clib_error_t *
session_manager_main_enable (vlib_main_t * vm)
{
session_manager_main_t *smm = &session_manager_main;
vlib_thread_main_t *vtm = vlib_get_thread_main ();
u32 num_threads;
int i;
num_threads = 1 /* main thread */ + vtm->n_threads;
if (num_threads < 1)
return clib_error_return (0, "n_thread_stacks not set");
/* $$$ config parameters */
svm_fifo_segment_init (0x200000000ULL /* first segment base VA */ ,
20 /* timeout in seconds */ );
/* configure per-thread ** vectors */
vec_validate (smm->sessions, num_threads - 1);
vec_validate (smm->session_indices_to_enqueue_by_thread, num_threads - 1);
vec_validate (smm->tx_buffers, num_threads - 1);
vec_validate (smm->pending_event_vector, num_threads - 1);
vec_validate (smm->free_event_vector, num_threads - 1);
vec_validate (smm->current_enqueue_epoch, num_threads - 1);
vec_validate (smm->vpp_event_queues, num_threads - 1);
for (i = 0; i < num_threads; i++)
{
vec_validate (smm->free_event_vector[i], 0);
_vec_len (smm->free_event_vector[i]) = 0;
vec_validate (smm->pending_event_vector[i], 0);
_vec_len (smm->pending_event_vector[i]) = 0;
}
#if SESSION_DBG
vec_validate (smm->last_event_poll_by_thread, num_threads - 1);
#endif
/* Allocate vpp event queues */
for (i = 0; i < vec_len (smm->vpp_event_queues); i++)
session_vpp_event_queue_allocate (smm, i);
/* $$$$ preallocate hack config parameter */
for (i = 0; i < 200000; i++)
{
stream_session_t *ss;
pool_get_aligned (smm->sessions[0], ss, CLIB_CACHE_LINE_BYTES);
memset (ss, 0, sizeof (*ss));
}
for (i = 0; i < 200000; i++)
pool_put_index (smm->sessions[0], i);
clib_bihash_init_16_8 (&smm->v4_session_hash, "v4 session table",
200000 /* $$$$ config parameter nbuckets */ ,
(64 << 20) /*$$$ config parameter table size */ );
clib_bihash_init_48_8 (&smm->v6_session_hash, "v6 session table",
200000 /* $$$$ config parameter nbuckets */ ,
(64 << 20) /*$$$ config parameter table size */ );
clib_bihash_init_16_8 (&smm->v4_half_open_hash, "v4 half-open table",
200000 /* $$$$ config parameter nbuckets */ ,
(64 << 20) /*$$$ config parameter table size */ );
clib_bihash_init_48_8 (&smm->v6_half_open_hash, "v6 half-open table",
200000 /* $$$$ config parameter nbuckets */ ,
(64 << 20) /*$$$ config parameter table size */ );
smm->is_enabled = 1;
/* Enable TCP transport */
vnet_tcp_enable_disable (vm, 1);
return 0;
}
void
session_node_enable_disable (u8 is_en)
{
u8 state = is_en ? VLIB_NODE_STATE_POLLING : VLIB_NODE_STATE_DISABLED;
/* *INDENT-OFF* */
foreach_vlib_main (({
vlib_node_set_state (this_vlib_main, session_queue_node.index,
state);
}));
/* *INDENT-ON* */
}
clib_error_t *
vnet_session_enable_disable (vlib_main_t * vm, u8 is_en)
{
if (is_en)
{
if (session_manager_main.is_enabled)
return 0;
session_node_enable_disable (is_en);
return session_manager_main_enable (vm);
}
else
{
session_manager_main.is_enabled = 0;
session_node_enable_disable (is_en);
}
return 0;
}
clib_error_t *
session_manager_main_init (vlib_main_t * vm)
{
session_manager_main_t *smm = &session_manager_main;
smm->vlib_main = vm;
smm->vnet_main = vnet_get_main ();
smm->is_enabled = 0;
return 0;
}
VLIB_INIT_FUNCTION (session_manager_main_init)
static clib_error_t *session_config_fn (vlib_main_t * vm,
unformat_input_t * input)
{
session_manager_main_t *smm = &session_manager_main;
u32 nitems;
while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
{
if (unformat (input, "event-queue-length %d", &nitems))
{
if (nitems >= 2048)
smm->configured_event_queue_length = nitems;
else
clib_warning ("event queue length %d too small, ignored", nitems);
}
else
return clib_error_return (0, "unknown input `%U'",
format_unformat_error, input);
}
return 0;
}
VLIB_CONFIG_FUNCTION (session_config_fn, "session");
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/