udp: track connection port sharing
Type: feature
Signed-off-by: Florin Coras <fcoras@cisco.com>
Change-Id: I822ed0596944a554595eb62a45841d216d1ab611
diff --git a/src/vnet/udp/udp.c b/src/vnet/udp/udp.c
index b069e72..3f36ce7 100644
--- a/src/vnet/udp/udp.c
+++ b/src/vnet/udp/udp.c
@@ -21,9 +21,77 @@
#include <vnet/session/session.h>
#include <vnet/dpo/load_balance.h>
#include <vnet/fib/ip4_fib.h>
+#include <vppinfra/sparse_vec.h>
udp_main_t udp_main;
+static void
+udp_connection_register_port (vlib_main_t * vm, u16 lcl_port, u8 is_ip4)
+{
+ udp_main_t *um = &udp_main;
+ udp_dst_port_info_t *pi;
+ u16 *n;
+
+ pi = udp_get_dst_port_info (um, lcl_port, is_ip4);
+ if (!pi)
+ {
+ udp_add_dst_port (um, lcl_port, 0, is_ip4);
+ pi = udp_get_dst_port_info (um, lcl_port, is_ip4);
+ pi->n_connections = 1;
+ }
+ else
+ {
+ pi->n_connections += 1;
+ /* Do not return. The fact that the pi is valid does not mean
+ * it's up to date */
+ }
+
+ pi->node_index = is_ip4 ? udp4_input_node.index : udp6_input_node.index;
+ pi->next_index = um->local_to_input_edge[is_ip4];
+
+ /* Setup udp protocol -> next index sparse vector mapping. */
+ if (is_ip4)
+ n = sparse_vec_validate (um->next_by_dst_port4,
+ clib_host_to_net_u16 (lcl_port));
+ else
+ n = sparse_vec_validate (um->next_by_dst_port6,
+ clib_host_to_net_u16 (lcl_port));
+
+ n[0] = pi->next_index;
+}
+
+static void
+udp_connection_unregister_port (u16 lcl_port, u8 is_ip4)
+{
+ udp_main_t *um = &udp_main;
+ udp_dst_port_info_t *pi;
+
+ pi = udp_get_dst_port_info (um, lcl_port, is_ip4);
+ if (!pi)
+ return;
+
+ if (!pi->n_connections)
+ {
+ clib_warning ("no connections using port %u", lcl_port);
+ return;
+ }
+
+ if (!clib_atomic_sub_fetch (&pi->n_connections, 1))
+ udp_unregister_dst_port (0, lcl_port, is_ip4);
+}
+
+void
+udp_connection_share_port (u16 lcl_port, u8 is_ip4)
+{
+ udp_main_t *um = &udp_main;
+ udp_dst_port_info_t *pi;
+
+ /* Done without a lock but the operation is atomic. Writers to pi hash
+ * table and vector should be guarded by a barrier sync */
+ pi = udp_get_dst_port_info (um, lcl_port, is_ip4);
+ clib_atomic_fetch_add_rel (&pi->n_connections, 1);
+}
+
udp_connection_t *
udp_connection_alloc (u32 thread_index)
{
@@ -67,11 +135,8 @@
void
udp_connection_delete (udp_connection_t * uc)
{
- if ((uc->flags & UDP_CONN_F_OWNS_PORT)
- || !(uc->flags & UDP_CONN_F_CONNECTED))
- udp_unregister_dst_port (vlib_get_main (),
- clib_net_to_host_u16 (uc->c_lcl_port),
- uc->c_is_ip4);
+ udp_connection_unregister_port (clib_net_to_host_u16 (uc->c_lcl_port),
+ uc->c_is_ip4);
session_transport_delete_notify (&uc->connection);
udp_connection_free (uc);
}
@@ -84,13 +149,16 @@
transport_endpoint_cfg_t *lcl_ext;
udp_connection_t *listener;
udp_dst_port_info_t *pi;
- u32 node_index;
void *iface_ip;
pi = udp_get_dst_port_info (um, clib_net_to_host_u16 (lcl->port),
lcl->is_ip4);
- if (pi)
- return -1;
+
+ if (pi && !pi->n_connections)
+ {
+ clib_warning ("port already used");
+ return -1;
+ }
pool_get (um->listener_pool, listener);
clib_memset (listener, 0, sizeof (udp_connection_t));
@@ -118,21 +186,21 @@
listener->c_flags |= TRANSPORT_CONNECTION_F_CLESS;
clib_spinlock_init (&listener->rx_lock);
- node_index = lcl->is_ip4 ? udp4_input_node.index : udp6_input_node.index;
- udp_register_dst_port (vm, clib_net_to_host_u16 (lcl->port), node_index,
- lcl->is_ip4);
+ udp_connection_register_port (vm, clib_net_to_host_u16 (lcl->port),
+ lcl->is_ip4);
return listener->c_c_index;
}
u32
udp_session_unbind (u32 listener_index)
{
- vlib_main_t *vm = vlib_get_main ();
-
+ udp_main_t *um = &udp_main;
udp_connection_t *listener;
+
listener = udp_listener_get (listener_index);
- udp_unregister_dst_port (vm, clib_net_to_host_u16 (listener->c_lcl_port),
- listener->c_is_ip4);
+ udp_connection_unregister_port (clib_net_to_host_u16 (listener->c_lcl_port),
+ listener->c_is_ip4);
+ pool_put (um->listener_pool, listener);
return 0;
}
@@ -295,30 +363,36 @@
int
udp_open_connection (transport_endpoint_cfg_t * rmt)
{
- udp_main_t *um = vnet_get_udp_main ();
vlib_main_t *vm = vlib_get_main ();
u32 thread_index = vm->thread_index;
udp_connection_t *uc;
ip46_address_t lcl_addr;
- u32 node_index;
u16 lcl_port;
if (transport_alloc_local_endpoint (TRANSPORT_PROTO_UDP, rmt, &lcl_addr,
&lcl_port))
return -1;
- while (udp_get_dst_port_info (um, lcl_port, rmt->is_ip4))
+ if (udp_is_valid_dst_port (lcl_port, rmt->is_ip4))
{
- lcl_port = transport_alloc_local_port (TRANSPORT_PROTO_UDP, &lcl_addr);
- if (lcl_port < 1)
+ /* If specific source port was requested abort */
+ if (rmt->peer.port)
+ return -1;
+
+ /* Try to find a port that's not used */
+ while (udp_is_valid_dst_port (lcl_port, rmt->is_ip4))
{
- clib_warning ("Failed to allocate src port");
- return -1;
+ lcl_port = transport_alloc_local_port (TRANSPORT_PROTO_UDP,
+ &lcl_addr);
+ if (lcl_port < 1)
+ {
+ clib_warning ("Failed to allocate src port");
+ return -1;
+ }
}
}
- node_index = rmt->is_ip4 ? udp4_input_node.index : udp6_input_node.index;
- udp_register_dst_port (vm, lcl_port, node_index, 1 /* is_ipv4 */ );
+ udp_connection_register_port (vm, lcl_port, rmt->is_ip4);
/* We don't poll main thread if we have workers */
if (vlib_num_workers ())
@@ -483,6 +557,11 @@
clib_spinlock_init (&um->peekers_readers_locks[i]);
clib_spinlock_init (&um->peekers_write_locks[i]);
}
+
+ um->local_to_input_edge[UDP_IP4] =
+ vlib_node_add_next (vm, udp4_local_node.index, udp4_input_node.index);
+ um->local_to_input_edge[UDP_IP6] =
+ vlib_node_add_next (vm, udp6_local_node.index, udp6_input_node.index);
return 0;
}
diff --git a/src/vnet/udp/udp.h b/src/vnet/udp/udp.h
index 5ff613b..32e660b 100644
--- a/src/vnet/udp/udp.h
+++ b/src/vnet/udp/udp.h
@@ -106,7 +106,7 @@
/* Name (a c string). */
char *name;
- /* GRE protocol type in host byte order. */
+ /* Port number in host byte order. */
udp_dst_port_t dst_port;
/* Node which handles this type. */
@@ -115,6 +115,9 @@
/* Next index for this type. */
u32 next_index;
+ /* UDP sessions refcount (not tunnels) */
+ u32 n_connections;
+
/* Parser for packet generator edits for this protocol */
unformat_function_t *unformat_pg_edit;
} udp_dst_port_info_t;
@@ -141,6 +144,9 @@
u8 punt_unknown4;
u8 punt_unknown6;
+ /* Udp local to input arc index */
+ u32 local_to_input_edge[N_UDP_AF];
+
/*
* Per-worker thread udp connection pools used with session layer
*/
@@ -257,6 +263,8 @@
format_function_t format_udp_rx_trace;
unformat_function_t unformat_udp_header;
+void udp_add_dst_port (udp_main_t * um, udp_dst_port_t dst_port,
+ char *dst_port_name, u8 is_ip4);
void udp_register_dst_port (vlib_main_t * vm,
udp_dst_port_t dst_port,
u32 node_index, u8 is_ip4);
@@ -264,6 +272,8 @@
udp_dst_port_t dst_port, u8 is_ip4);
bool udp_is_valid_dst_port (udp_dst_port_t dst_port, u8 is_ip4);
+void udp_connection_share_port (u16 lcl_port, u8 is_ip4);
+
void udp_punt_unknown (vlib_main_t * vm, u8 is_ip4, u8 is_add);
always_inline void *
diff --git a/src/vnet/udp/udp_input.c b/src/vnet/udp/udp_input.c
index 453e123..4b22cbe 100644
--- a/src/vnet/udp/udp_input.c
+++ b/src/vnet/udp/udp_input.c
@@ -220,6 +220,8 @@
s0->session_state = SESSION_STATE_READY;
tc0 = &child0->connection;
uc0 = udp_get_connection_from_transport (tc0);
+ udp_connection_share_port (clib_net_to_host_u16
+ (uc0->c_lcl_port), uc0->c_is_ip4);
error0 = UDP_ERROR_LISTENER;
}
}
diff --git a/src/vnet/udp/udp_local.c b/src/vnet/udp/udp_local.c
index af54b73..748ad73 100644
--- a/src/vnet/udp/udp_local.c
+++ b/src/vnet/udp/udp_local.c
@@ -447,9 +447,9 @@
/* *INDENT-ON* */
#ifndef CLIB_MARCH_VARIANT
-static void
-add_dst_port (udp_main_t * um,
- udp_dst_port_t dst_port, char *dst_port_name, u8 is_ip4)
+void
+udp_add_dst_port (udp_main_t * um, udp_dst_port_t dst_port,
+ char *dst_port_name, u8 is_ip4)
{
udp_dst_port_info_t *pi;
u32 i;
@@ -484,7 +484,7 @@
pi = udp_get_dst_port_info (um, dst_port, is_ip4);
if (!pi)
{
- add_dst_port (um, dst_port, 0, is_ip4);
+ udp_add_dst_port (um, dst_port, 0, is_ip4);
pi = udp_get_dst_port_info (um, dst_port, is_ip4);
ASSERT (pi);
}
@@ -633,10 +633,10 @@
( /* elt bytes */ sizeof (um->next_by_dst_port6[0]),
/* bits in index */ BITS (((udp_header_t *) 0)->dst_port));
-#define _(n,s) add_dst_port (um, UDP_DST_PORT_##s, #s, 1 /* is_ip4 */);
+#define _(n,s) udp_add_dst_port (um, UDP_DST_PORT_##s, #s, 1 /* is_ip4 */);
foreach_udp4_dst_port
#undef _
-#define _(n,s) add_dst_port (um, UDP_DST_PORT_##s, #s, 0 /* is_ip4 */);
+#define _(n,s) udp_add_dst_port (um, UDP_DST_PORT_##s, #s, 0 /* is_ip4 */);
foreach_udp6_dst_port
#undef _
ip4_register_protocol (IP_PROTOCOL_UDP, udp4_local_node.index);