GBP plugin

Group Base Policy (GBP) defines:
 - endpoints: typically a VM or container that is connected to the
              virtual switch/router (i.e. to VPP)
 - endpoint-group: (EPG) a collection of endpoints
 - policy: rules determining which traffic can pass between EPGs a.k.a
            a 'contract'

Here, policy is implemented via an ACL.
EPG classification for transit packets is determined by:
 - source EPG: from the packet's input interface
 - destination EPG: from the packet's destination IP address.

Change-Id: I7b983844826b5fc3d49e21353ebda9df9b224e25
Signed-off-by: Neale Ranns <neale.ranns@cisco.com>

1 files changed, 294 insertions, 0 deletions

diff --git a/src/plugins/gbp/gbp_api.c b/src/plugins/gbp/gbp_api.c
new file mode 100644
index 00000000000..998d5d9bdbb
--- /dev/null
+++ b/src/plugins/gbp/gbp_api.c
@@ -0,0 +1,294 @@
+/*
+ *------------------------------------------------------------------
+ * gbp_api.c - layer 2 emulation api
+ *
+ * Copyright (c) 2016 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.
+ *------------------------------------------------------------------
+ */
+
+#include <vnet/vnet.h>
+#include <vnet/plugin/plugin.h>
+
+#include <vnet/interface.h>
+#include <vnet/api_errno.h>
+#include <vpp/app/version.h>
+
+#include <gbp/gbp.h>
+
+#include <vlibapi/api.h>
+#include <vlibmemory/api.h>
+
+/* define message IDs */
+#include <gbp/gbp_msg_enum.h>
+
+#define vl_typedefs		/* define message structures */
+#include <gbp/gbp_all_api_h.h>
+#undef vl_typedefs
+
+#define vl_endianfun		/* define message structures */
+#include <gbp/gbp_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 <gbp/gbp_all_api_h.h>
+#undef vl_printfun
+
+/* Get the API version number */
+#define vl_api_version(n,v) static u32 api_version=(v);
+#include <acl/acl_all_api_h.h>
+#undef vl_api_version
+
+#include <vlibapi/api_helper_macros.h>
+
+#define foreach_gbp_api_msg                                 \
+  _(GBP_ENDPOINT_ADD_DEL, gbp_endpoint_add_del)             \
+  _(GBP_ENDPOINT_DUMP, gbp_endpoint_dump)                   \
+  _(GBP_CONTRACT_ADD_DEL, gbp_contract_add_del)             \
+  _(GBP_CONTRACT_DUMP, gbp_contract_dump)
+
+/**
+ * L2 Emulation Main
+ */
+typedef struct gbp_main_t_
+{
+  u16 msg_id_base;
+} gbp_main_t;
+
+static gbp_main_t gbp_main;
+
+#define GBP_MSG_BASE gbp_main.msg_id_base
+
+static void
+vl_api_gbp_endpoint_add_del_t_handler (vl_api_gbp_endpoint_add_del_t * mp)
+{
+  vl_api_gbp_endpoint_add_del_reply_t *rmp;
+  ip46_address_t ip = { };
+  u32 sw_if_index;
+  int rv = 0;
+
+  sw_if_index = ntohl (mp->endpoint.sw_if_index);
+  if (!vnet_sw_if_index_is_api_valid (sw_if_index))
+    goto bad_sw_if_index;
+
+  if (mp->endpoint.is_ip6)
+    {
+      clib_memcpy (&ip.ip6, mp->endpoint.address, sizeof (ip.ip6));
+    }
+  else
+    {
+      clib_memcpy (&ip.ip4, mp->endpoint.address, sizeof (ip.ip4));
+    }
+
+  if (mp->is_add)
+    {
+      gbp_endpoint_update (sw_if_index, &ip, ntohl (mp->endpoint.epg_id));
+    }
+  else
+    {
+      gbp_endpoint_delete (sw_if_index, &ip);
+    }
+
+  BAD_SW_IF_INDEX_LABEL;
+
+  REPLY_MACRO (VL_API_GBP_ENDPOINT_ADD_DEL_REPLY + GBP_MSG_BASE);
+}
+
+typedef struct gbp_walk_ctx_t_
+{
+  vl_api_registration_t *reg;
+  u32 context;
+} gbp_walk_ctx_t;
+
+static int
+gbp_endpoint_send_details (gbp_endpoint_t * gbpe, void *args)
+{
+  vl_api_gbp_endpoint_details_t *mp;
+  gbp_walk_ctx_t *ctx;
+
+  ctx = args;
+  mp = vl_msg_api_alloc (sizeof (*mp));
+  if (!mp)
+    return 1;
+
+  memset (mp, 0, sizeof (*mp));
+  mp->_vl_msg_id = ntohs (VL_API_GBP_ENDPOINT_DETAILS + GBP_MSG_BASE);
+  mp->context = ctx->context;
+
+  mp->endpoint.sw_if_index = ntohl (gbpe->ge_key->gek_sw_if_index);
+  mp->endpoint.is_ip6 = !ip46_address_is_ip4 (&gbpe->ge_key->gek_ip);
+  if (mp->endpoint.is_ip6)
+    clib_memcpy (&mp->endpoint.address,
+		 &gbpe->ge_key->gek_ip.ip6,
+		 sizeof (gbpe->ge_key->gek_ip.ip6));
+  else
+    clib_memcpy (&mp->endpoint.address,
+		 &gbpe->ge_key->gek_ip.ip4,
+		 sizeof (gbpe->ge_key->gek_ip.ip4));
+
+  mp->endpoint.epg_id = ntohl (gbpe->ge_epg_id);
+
+  vl_api_send_msg (ctx->reg, (u8 *) mp);
+
+  return (1);
+}
+
+static void
+vl_api_gbp_endpoint_dump_t_handler (vl_api_gbp_endpoint_dump_t * mp)
+{
+  vl_api_registration_t *reg;
+
+  reg = vl_api_client_index_to_registration (mp->client_index);
+  if (!reg)
+    return;
+
+  gbp_walk_ctx_t ctx = {
+    .reg = reg,
+    .context = mp->context,
+  };
+
+  gbp_endpoint_walk (gbp_endpoint_send_details, &ctx);
+}
+
+static void
+vl_api_gbp_contract_add_del_t_handler (vl_api_gbp_contract_add_del_t * mp)
+{
+  vl_api_gbp_contract_add_del_reply_t *rmp;
+  int rv = 0;
+
+  if (mp->is_add)
+    gbp_contract_update (ntohl (mp->contract.src_epg),
+			 ntohl (mp->contract.dst_epg),
+			 ntohl (mp->contract.acl_index));
+  else
+    gbp_contract_delete (ntohl (mp->contract.src_epg),
+			 ntohl (mp->contract.dst_epg));
+
+  REPLY_MACRO (VL_API_GBP_CONTRACT_ADD_DEL_REPLY + GBP_MSG_BASE);
+}
+
+static int
+gbp_contract_send_details (gbp_contract_t * gbpc, void *args)
+{
+  vl_api_gbp_contract_details_t *mp;
+  gbp_walk_ctx_t *ctx;
+
+  ctx = args;
+  mp = vl_msg_api_alloc (sizeof (*mp));
+  if (!mp)
+    return 1;
+
+  memset (mp, 0, sizeof (*mp));
+  mp->_vl_msg_id = ntohs (VL_API_GBP_CONTRACT_DETAILS + GBP_MSG_BASE);
+  mp->context = ctx->context;
+
+  mp->contract.src_epg = ntohl (gbpc->gc_key.gck_src);
+  mp->contract.dst_epg = ntohl (gbpc->gc_key.gck_dst);
+  mp->contract.acl_index = ntohl (gbpc->gc_acl_index);
+
+  vl_api_send_msg (ctx->reg, (u8 *) mp);
+
+  return (1);
+}
+
+static void
+vl_api_gbp_contract_dump_t_handler (vl_api_gbp_contract_dump_t * mp)
+{
+  vl_api_registration_t *reg;
+
+  reg = vl_api_client_index_to_registration (mp->client_index);
+  if (!reg)
+    return;
+
+  gbp_walk_ctx_t ctx = {
+    .reg = reg,
+    .context = mp->context,
+  };
+
+  gbp_contract_walk (gbp_contract_send_details, &ctx);
+}
+
+/*
+ * gbp_api_hookup
+ * Add vpe's API message handlers to the table.
+ * vlib has alread mapped shared memory and
+ * added the client registration handlers.
+ * See .../vlib-api/vlibmemory/memclnt_vlib.c:memclnt_process()
+ */
+#define vl_msg_name_crc_list
+#include <gbp/gbp_all_api_h.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 + GBP_MSG_BASE);
+  foreach_vl_msg_name_crc_gbp;
+#undef _
+}
+
+static void
+gbp_api_hookup (vlib_main_t * vm)
+{
+#define _(N,n)                                                  \
+    vl_msg_api_set_handlers(VL_API_##N + GBP_MSG_BASE,          \
+                            #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_gbp_api_msg;
+#undef _
+}
+
+static clib_error_t *
+gbp_init (vlib_main_t * vm)
+{
+  api_main_t *am = &api_main;
+  gbp_main_t *gbpm = &gbp_main;
+  u8 *name = format (0, "gbp_%08x%c", api_version, 0);
+
+  /* Ask for a correctly-sized block of API message decode slots */
+  gbpm->msg_id_base = vl_msg_api_get_msg_ids ((char *) name,
+					      VL_MSG_FIRST_AVAILABLE);
+
+  gbp_api_hookup (vm);
+
+  /* Add our API messages to the global name_crc hash table */
+  setup_message_id_table (am);
+
+  vec_free (name);
+  return (NULL);
+}
+
+VLIB_API_INIT_FUNCTION (gbp_init);
+
+/* *INDENT-OFF* */
+VLIB_PLUGIN_REGISTER () = {
+    .version = VPP_BUILD_VER,
+    .description = "Group Based Policy",
+};
+/* *INDENT-ON* */
+
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */