SCTP: API to add a sub-connection

This patch adds an API to add a sub-connection following a SRC/DST IP
mapping as required by the RFC4960.
At the same time, it changes the way the next available sub-connection
is being calculated: rather than having an index in the parent
connection which is prone to many issues at run-time, the next available
sub-connection is being calculated by looking at the state of the set
sub-connections and if marked as DOWN it means that is an available slot
to be used.

Change-Id: I662be6a247bfbbe8bf9aaf3f485183c07ef862fe
Signed-off-by: Marco Varlese <marco.varlese@suse.com>

1 files changed, 114 insertions, 0 deletions

diff --git a/src/vnet/sctp/sctp_api.c b/src/vnet/sctp/sctp_api.c
new file mode 100644
index 00000000000..2c1b072228f
--- /dev/null
+++ b/src/vnet/sctp/sctp_api.c
@@ -0,0 +1,114 @@
+/*
+ *------------------------------------------------------------------
+ * sctp_api.c - vnet sctp-layer API
+ *
+ * Copyright (c) 2018 SUSE LLC.
+ * 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/vnet.h>
+#include <vlibmemory/api.h>
+
+#include <vnet/sctp/sctp.h>
+
+#include <vnet/vnet_msg_enum.h>
+
+#define vl_typedefs		/* define message structures */
+#include <vnet/vnet_all_api_h.h>
+#undef vl_typedefs
+
+#define vl_endianfun		/* define message structures */
+#include <vnet/vnet_all_api_h.h>
+#undef vl_endianfun
+
+/* instantiate all the print functions we know about */
+#define vl_print(handle, ...) vlib_cli_output (handle, __VA_ARGS__)
+#define vl_printfun
+#include <vnet/vnet_all_api_h.h>
+#undef vl_printfun
+
+#include <vlibapi/api_helper_macros.h>
+
+#define foreach_sctp_api_msg                                     \
+_(SCTP_ADD_SRC_DST_CONNECTION, sctp_add_src_dst_connection)
+
+static void
+  vl_api_sctp_add_src_dst_connection_t_handler
+  (vl_api_sctp_add_src_dst_connection_t * mp)
+{
+  vlib_main_t *vm = vlib_get_main ();
+  vl_api_sctp_add_src_dst_connection_reply_t *rmp;
+  int rv;
+
+  if (mp->is_ipv6)
+    rv = sctp_sub_connection_add_ip6
+      (vm,
+       (ip6_address_t *) mp->src_address, (ip6_address_t *) mp->dst_address);
+  else
+    rv = sctp_sub_connection_add_ip4
+      (vm,
+       (ip4_address_t *) mp->src_address, (ip4_address_t *) mp->dst_address);
+
+  REPLY_MACRO (VL_API_SCTP_ADD_SRC_DST_CONNECTION_REPLY);
+}
+
+#define vl_msg_name_crc_list
+#include <vnet/sctp/sctp.api.h>
+#undef vl_msg_name_crc_list
+
+static void
+setup_message_id_table (api_main_t * am)
+{
+#define _(id,n,crc) vl_msg_api_add_msg_name_crc (am, #n "_" #crc, id);
+  foreach_vl_msg_name_crc_sctp;
+#undef _
+}
+
+static clib_error_t *
+sctp_api_hookup (vlib_main_t * vm)
+{
+  api_main_t *am = &api_main;
+
+#define _(N,n)                                                  \
+    vl_msg_api_set_handlers(VL_API_##N, #n,                     \
+                           vl_api_##n##_t_handler,              \
+                           vl_noop_handler,                     \
+                           vl_api_##n##_t_endian,               \
+                           vl_api_##n##_t_print,                \
+                           sizeof(vl_api_##n##_t), 1);
+  foreach_sctp_api_msg;
+#undef _
+
+  /*
+   * Set up the (msg_name, crc, message-id) table
+   */
+  setup_message_id_table (am);
+
+  return 0;
+}
+
+VLIB_API_INIT_FUNCTION (sctp_api_hookup);
+
+void
+sctp_api_reference (void)
+{
+}
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */