ip: add VNET_IP_TABLE_ADD_DEL_FUNCTION
vrf table may be dynamically added or deleted. When the table is deleted,
clients who use the corresponding vrf table may need a callback to
do the clean up. The mechanism added here is cloned from
VNET_SW_INTERFACE_ADD_DEL_FUNCTION.
Type: improvement
Signed-off-by: Steven Luong <sluong@cisco.com>
Change-Id: I08635c715cd7361a6c359b90890dd3545b0da94c
diff --git a/src/vnet/CMakeLists.txt b/src/vnet/CMakeLists.txt
index e418218..7757301 100644
--- a/src/vnet/CMakeLists.txt
+++ b/src/vnet/CMakeLists.txt
@@ -489,6 +489,7 @@
ip/ip6_hop_by_hop_packet.h
ip/ip6_packet.h
ip/ip.h
+ ip/ip_table.h
ip/ip_interface.h
ip/ip_packet.h
ip/ip_source_and_port_range_check.h
diff --git a/src/vnet/ip/ip_api.c b/src/vnet/ip/ip_api.c
index b976eae..d264806 100644
--- a/src/vnet/ip/ip_api.c
+++ b/src/vnet/ip/ip_api.c
@@ -46,6 +46,7 @@
#include <vnet/ip/reass/ip4_full_reass.h>
#include <vnet/ip/reass/ip6_sv_reass.h>
#include <vnet/ip/reass/ip6_full_reass.h>
+#include <vnet/ip/ip_table.h>
#include <vnet/vnet_msg_enum.h>
@@ -452,10 +453,37 @@
REPLY_MACRO (VL_API_IP_PUNT_REDIRECT_REPLY);
}
+static clib_error_t *
+call_elf_section_ip_table_callbacks (vnet_main_t * vnm, u32 table_id,
+ u32 flags,
+ _vnet_ip_table_function_list_elt_t **
+ elts)
+{
+ _vnet_ip_table_function_list_elt_t *elt;
+ vnet_ip_table_function_priority_t prio;
+ clib_error_t *error = 0;
+
+ for (prio = VNET_IP_TABLE_FUNC_PRIORITY_LOW;
+ prio <= VNET_IP_TABLE_FUNC_PRIORITY_HIGH; prio++)
+ {
+ elt = elts[prio];
+
+ while (elt)
+ {
+ error = elt->fp (vnm, table_id, flags);
+ if (error)
+ return error;
+ elt = elt->next_ip_table_function;
+ }
+ }
+ return error;
+}
+
void
ip_table_delete (fib_protocol_t fproto, u32 table_id, u8 is_api)
{
u32 fib_index, mfib_index;
+ vnet_main_t *vnm = vnet_get_main ();
/*
* ignore action on the default table - this is always present
@@ -474,6 +502,10 @@
fib_index = fib_table_find (fproto, table_id);
mfib_index = mfib_table_find (fproto, table_id);
+ if ((~0 != fib_index) || (~0 != mfib_index))
+ call_elf_section_ip_table_callbacks (vnm, table_id, 0 /* is_add */ ,
+ vnm->ip_table_add_del_functions);
+
if (~0 != fib_index)
{
fib_table_unlock (fib_index, fproto,
@@ -635,6 +667,7 @@
u32 table_id, u8 is_api, const u8 * name)
{
u32 fib_index, mfib_index;
+ vnet_main_t *vnm = vnet_get_main ();
/*
* ignore action on the default table - this is always present
@@ -667,6 +700,10 @@
MFIB_SOURCE_API :
MFIB_SOURCE_CLI), name);
}
+
+ if ((~0 == fib_index) || (~0 == mfib_index))
+ call_elf_section_ip_table_callbacks (vnm, table_id, 1 /* is_add */ ,
+ vnm->ip_table_add_del_functions);
}
}
diff --git a/src/vnet/ip/ip_table.h b/src/vnet/ip/ip_table.h
new file mode 100644
index 0000000..1f75c15
--- /dev/null
+++ b/src/vnet/ip/ip_table.h
@@ -0,0 +1,95 @@
+/*
+ * Copyright (c) 2020 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.
+ */
+
+#ifndef included_ip_table_h
+#define included_ip_table_h
+
+#include <vlib/vlib.h>
+
+/* ip table add delete callback */
+typedef struct _vnet_ip_table_function_list_elt
+{
+ struct _vnet_ip_table_function_list_elt *next_ip_table_function;
+ clib_error_t *(*fp) (struct vnet_main_t * vnm, u32 table_id, u32 flags);
+} _vnet_ip_table_function_list_elt_t;
+
+typedef enum vnet_ip_table_function_priority_t_
+{
+ VNET_IP_TABLE_FUNC_PRIORITY_LOW,
+ VNET_IP_TABLE_FUNC_PRIORITY_HIGH,
+} vnet_ip_table_function_priority_t;
+#define VNET_IP_TABLE_FUNC_N_PRIO ((vnet_ip_table_function_priority_t)VNET_IP_TABLE_FUNC_PRIORITY_HIGH+1)
+
+#ifndef CLIB_MARCH_VARIANT
+#define _VNET_IP_TABLE_FUNCTION_DECL_PRIO(f,tag,p) \
+ \
+static void __vnet_ip_table_function_init_##tag##_##f (void) \
+ __attribute__((__constructor__)) ; \
+ \
+static void __vnet_ip_table_function_init_##tag##_##f (void) \
+{ \
+ vnet_main_t * vnm = vnet_get_main(); \
+ static _vnet_ip_table_function_list_elt_t init_function; \
+ init_function.next_ip_table_function = vnm->tag##_functions[p]; \
+ vnm->tag##_functions[p] = &init_function; \
+ init_function.fp = (void *) &f; \
+} \
+static void __vnet_ip_table_function_deinit_##tag##_##f (void) \
+ __attribute__((__destructor__)) ; \
+ \
+static void __vnet_ip_table_function_deinit_##tag##_##f (void) \
+{ \
+ vnet_main_t * vnm = vnet_get_main(); \
+ _vnet_ip_table_function_list_elt_t *next; \
+ if (vnm->tag##_functions[p]->fp == f) \
+ { \
+ vnm->tag##_functions[p] = \
+ vnm->tag##_functions[p]->next_ip_table_function; \
+ return; \
+ } \
+ next = vnm->tag##_functions[p]; \
+ while (next->next_ip_table_function) \
+ { \
+ if (next->next_ip_table_function->fp == f) \
+ { \
+ next->next_ip_table_function = \
+ next->next_ip_table_function->next_ip_table_function; \
+ return; \
+ } \
+ next = next->next_ip_table_function; \
+ } \
+}
+#else
+/* create unused pointer to silence compiler warnings and get whole
+ function optimized out */
+#define _VNET_IP_TABLE_FUNCTION_DECL_PRIO(f,tag,p) \
+static __clib_unused void * __clib_unused_##f = f;
+#endif
+
+#define _VNET_IP_TABLE_FUNCTION_DECL(f,tag) \
+ _VNET_IP_TABLE_FUNCTION_DECL_PRIO(f,tag,VNET_ITF_FUNC_PRIORITY_LOW)
+
+#define VNET_IP_TABLE_ADD_DEL_FUNCTION(f) \
+ _VNET_IP_TABLE_FUNCTION_DECL(f,ip_table_add_del)
+
+#endif /* included_ip_table_h */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
diff --git a/src/vnet/vnet.h b/src/vnet/vnet.h
index 3b20f71..42f7333 100644
--- a/src/vnet/vnet.h
+++ b/src/vnet/vnet.h
@@ -47,6 +47,7 @@
#include <vnet/config.h>
#include <vnet/interface.h>
#include <vnet/api_errno.h>
+#include <vnet/ip/ip_table.h>
typedef struct vnet_main_t
{
@@ -71,6 +72,9 @@
uword *interface_tag_by_sw_if_index;
+ _vnet_ip_table_function_list_elt_t
+ * ip_table_add_del_functions[VNET_ITF_FUNC_N_PRIO];
+
/*
* Last "api" error, preserved so we can issue reasonable diagnostics
* at or near the top of the food chain