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authorFlorin Coras <fcoras@cisco.com>2021-05-07 19:39:43 -0700
committerFlorin Coras <florin.coras@gmail.com>2021-05-10 20:53:32 +0000
commitea72764204dac0a1ab6412bc27b758faead2ca10 (patch)
treed22e849e0e0a84b11c42373c1b97fb6b715d3098 /src/vnet/session/session.c
parente2272ac27c31b8cf7ecf0ff8d4244f90034a09f4 (diff)
session: use half-open sessions for vc establishment
Use half-open sessions to track virtual circuit connection establishment. These sesssions can only be allocated and freed by the thread that allocates half-open connections (main). Consequently, they can only be freed on half-open cleanup notifications from transports. Goal is to simplify state tracking within the session layer but it's also a first step towards allowing builtin apps to track and cleanup outstanding connects. Type: improvement Signed-off-by: Florin Coras <fcoras@cisco.com> Change-Id: I8a535906d13eb7f8966deb82333839de80f8049f
Diffstat (limited to 'src/vnet/session/session.c')
-rw-r--r--src/vnet/session/session.c96
1 files changed, 48 insertions, 48 deletions
diff --git a/src/vnet/session/session.c b/src/vnet/session/session.c
index 7fe35c233c8..1fac5ed2bb9 100644
--- a/src/vnet/session/session.c
+++ b/src/vnet/session/session.c
@@ -251,6 +251,10 @@ session_is_valid (u32 si, u8 thread_index)
|| s->session_state <= SESSION_STATE_LISTENING)
return 1;
+ if (s->session_state == SESSION_STATE_CONNECTING &&
+ (s->flags & SESSION_F_HALF_OPEN))
+ return 1;
+
tc = session_get_transport (s);
if (s->connection_index != tc->c_index
|| s->thread_index != tc->thread_index || tc->s_index != si)
@@ -296,17 +300,23 @@ session_delete (session_t * s)
}
void
-session_cleanup_half_open (transport_proto_t tp, session_handle_t ho_handle)
+session_cleanup_half_open (session_handle_t ho_handle)
{
- transport_cleanup_half_open (tp, session_handle_index (ho_handle));
+ session_t *s = session_get_from_handle (ho_handle);
+ transport_cleanup_half_open (session_get_transport_proto (s),
+ s->connection_index);
}
void
-session_half_open_delete_notify (transport_proto_t tp,
- session_handle_t ho_handle)
+session_half_open_delete_notify (transport_connection_t *tc)
{
- app_worker_t *app_wrk = app_worker_get (session_handle_data (ho_handle));
- app_worker_del_half_open (app_wrk, tp, ho_handle);
+ app_worker_t *app_wrk;
+ session_t *s;
+
+ s = session_get (tc->s_index, tc->thread_index);
+ app_wrk = app_worker_get (s->app_wrk_index);
+ app_worker_del_half_open (app_wrk, s->ho_index);
+ session_free (s);
}
session_t *
@@ -328,6 +338,18 @@ session_alloc_for_connection (transport_connection_t * tc)
return s;
}
+static session_t *
+session_alloc_for_half_open (transport_connection_t *tc)
+{
+ session_t *s;
+
+ s = ho_session_alloc ();
+ s->session_type = session_type_from_proto_and_ip (tc->proto, tc->is_ip4);
+ s->connection_index = tc->c_index;
+ tc->s_index = s->session_index;
+ return s;
+}
+
/**
* Discards bytes from buffer chain
*
@@ -797,39 +819,21 @@ int
session_stream_connect_notify (transport_connection_t * tc,
session_error_t err)
{
- session_handle_t ho_handle, wrk_handle;
u32 opaque = 0, new_ti, new_si;
app_worker_t *app_wrk;
- session_t *s = 0;
+ session_t *s = 0, *ho;
/*
- * Find connection handle and cleanup half-open table
+ * Cleanup half-open table
*/
- ho_handle = session_lookup_half_open_handle (tc);
- if (ho_handle == HALF_OPEN_LOOKUP_INVALID_VALUE)
- {
- SESSION_DBG ("half-open was removed!");
- return -1;
- }
session_lookup_del_half_open (tc);
- /* Get the app's index from the handle we stored when opening connection
- * and the opaque (api_context for external apps) from transport session
- * index */
- app_wrk = app_worker_get_if_valid (session_handle_data (ho_handle));
+ ho = ho_session_get (tc->s_index);
+ opaque = ho->opaque;
+ app_wrk = app_worker_get_if_valid (ho->app_wrk_index);
if (!app_wrk)
return -1;
- wrk_handle = app_worker_lookup_half_open (app_wrk, tc->proto, ho_handle);
- if (wrk_handle == SESSION_INVALID_HANDLE)
- return -1;
-
- /* Make sure this is the same half-open index */
- if (session_handle_index (wrk_handle) != session_handle_index (ho_handle))
- return -1;
-
- opaque = session_handle_data (wrk_handle);
-
if (err)
return app_worker_connect_notify (app_wrk, s, err, opaque);
@@ -1258,7 +1262,8 @@ session_open_vc (u32 app_wrk_index, session_endpoint_t * rmt, u32 opaque)
{
transport_connection_t *tc;
transport_endpoint_cfg_t *tep;
- u64 handle, wrk_handle;
+ app_worker_t *app_wrk;
+ session_t *s;
int rv;
tep = session_endpoint_to_transport_cfg (rmt);
@@ -1271,27 +1276,22 @@ session_open_vc (u32 app_wrk_index, session_endpoint_t * rmt, u32 opaque)
tc = transport_get_half_open (rmt->transport_proto, (u32) rv);
- /* If transport offers a stream service, only allocate session once the
- * connection has been established.
- * Add connection to half-open table and 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 = session_make_handle (tc->c_index, app_wrk_index);
- session_lookup_add_half_open (tc, handle);
+ app_wrk = app_worker_get (app_wrk_index);
- /* Store the half-open handle in the connection. Transport will use it
- * when cleaning up @ref session_half_open_delete_notify
+ /* If transport offers a vc service, only allocate established
+ * session once the connection has been established.
+ * In the meantime allocate half-open session for tracking purposes
+ * associate half-open connection to it and add session to app-worker
+ * half-open table. These are needed to allocate the established
+ * session on transport notification, and to cleanup the half-open
+ * session if the app detaches before connection establishment.
*/
- tc->s_ho_handle = handle;
+ s = session_alloc_for_half_open (tc);
+ s->app_wrk_index = app_wrk->wrk_index;
+ s->ho_index = app_worker_add_half_open (app_wrk, session_handle (s));
+ s->opaque = opaque;
- /* Track the half-open connections in case we want to forcefully
- * clean them up @ref session_cleanup_half_open
- */
- wrk_handle = session_make_handle (tc->c_index, opaque);
- app_worker_add_half_open (app_worker_get (app_wrk_index),
- rmt->transport_proto, handle, wrk_handle);
+ session_lookup_add_half_open (tc, tc->c_index);
return 0;
}