srv6-mobile: Implement SRv6 mobile API funcs

This merge request adds the feature to manipulate localsids and policies for SRv6 mobile via API.

Type: feature
Signed-off-by: Takeru Hayasaka <hayatake396@gmail.com>
Change-Id: Ibb46bf71ae1d9d4591ce2c8ccf66f520887dad70

1 files changed, 339 insertions, 0 deletions

diff --git a/src/plugins/srv6-mobile/sr_mobile_api.c b/src/plugins/srv6-mobile/sr_mobile_api.c
new file mode 100644
index 00000000000..51199317a3b
--- /dev/null
+++ b/src/plugins/srv6-mobile/sr_mobile_api.c
@@ -0,0 +1,339 @@
+/*
+ *------------------------------------------------------------------
+ * sr_mobile_api.c - ipv6 segment routing for mobile u-plane api
+ *
+ * Copyright (c) 2022 BBSakura Networks Inc 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 <stdint.h>
+#include <vnet/vnet.h>
+#include <vnet/srv6/sr.h>
+#include <vlibmemory/api.h>
+
+#include <vnet/interface.h>
+#include <vnet/api_errno.h>
+#include <vnet/feature/feature.h>
+#include <vnet/fib/fib_table.h>
+#include <vnet/ip/ip_types_api.h>
+
+#include <vnet/format_fns.h>
+#include <vnet/srv6/sr.api_enum.h>
+#include <vnet/srv6/sr.api_types.h>
+
+#include <srv6-mobile/mobile.h>
+#include <srv6-mobile/sr_mobile.api_types.h>
+#include <srv6-mobile/sr_mobile_types.api_types.h>
+#include <srv6-mobile/sr_mobile.api_enum.h>
+
+#include <srv6-mobile/sr_mobile_api.h>
+
+u16 msg_id_base;
+#define REPLY_MSG_ID_BASE msg_id_base
+#include <vlibapi/api_helper_macros.h>
+
+static inline uint16_t
+sr_plugin_localsid_fn_num_find_by (ip6_sr_main_t *sm, const char *keyword_str,
+				   size_t keyword_len)
+{
+  sr_localsid_fn_registration_t *plugin = 0, **vec_plugins = 0;
+  sr_localsid_fn_registration_t **plugin_it = 0;
+  pool_foreach (plugin, sm->plugin_functions)
+    {
+      vec_add1 (vec_plugins, plugin);
+    }
+
+  vec_foreach (plugin_it, vec_plugins)
+    {
+      if (!srv6_mobile_strcmp_with_size (keyword_str, keyword_len,
+					 (char *) (*plugin_it)->keyword_str))
+	{
+	  return (*plugin_it)->sr_localsid_function_number;
+	}
+    }
+  return UINT16_MAX;
+}
+
+static inline uint16_t
+sr_plugin_policy_fn_num_find_by (ip6_sr_main_t *sm, const char *keyword_str,
+				 size_t keyword_len)
+{
+  sr_policy_fn_registration_t *plugin = 0, **vec_plugins = 0;
+  sr_policy_fn_registration_t **plugin_it = 0;
+  pool_foreach (plugin, sm->policy_plugin_functions)
+    {
+      vec_add1 (vec_plugins, plugin);
+    }
+
+  vec_foreach (plugin_it, vec_plugins)
+    {
+      if (!srv6_mobile_strcmp_with_size (keyword_str, keyword_len,
+					 (char *) (*plugin_it)->keyword_str))
+	{
+	  return (*plugin_it)->sr_policy_function_number;
+	}
+    }
+  return UINT16_MAX;
+}
+
+static void
+vl_api_sr_mobile_localsid_add_del_t_handler (
+  vl_api_sr_mobile_localsid_add_del_t *mp)
+{
+  ip6_sr_main_t *sm = &sr_main;
+  vl_api_sr_mobile_localsid_add_del_reply_t *rmp;
+  int rv = 0;
+  ip6_address_t localsid;
+  u16 localsid_prefix_len = 128;
+  void *ls_plugin_mem = 0;
+  u16 behavior = 0;
+  u32 dt_type;
+  size_t behavior_size = 0;
+  mobile_localsid_function_list_t kind_fn =
+    SRV6_MOBILE_LOCALSID_UNKNOWN_FUNCTION;
+
+  mp->behavior[sizeof (mp->behavior) - 1] = '\0';
+  behavior_size = sizeof (mp->behavior);
+  // search behavior index
+  if (mp->behavior[0])
+    {
+      if (!srv6_mobile_strcmp_with_size ((char *) mp->behavior, behavior_size,
+					 "end.m.gtp4.e"))
+	{
+	  kind_fn = SRV6_MOBILE_LOCALSID_END_M_GTP4_E;
+	}
+      else if (!srv6_mobile_strcmp_with_size ((char *) mp->behavior,
+					      behavior_size, "end.m.gtp6.e"))
+	{
+	  kind_fn = SRV6_MOBILE_LOCALSID_END_M_GTP6_E;
+	}
+      else if (!srv6_mobile_strcmp_with_size ((char *) mp->behavior,
+					      behavior_size, "end.m.gtp6.d"))
+	{
+	  kind_fn = SRV6_MOBILE_LOCALSID_END_M_GTP6_D;
+	}
+      else if (!srv6_mobile_strcmp_with_size (
+		 (char *) mp->behavior, behavior_size, "end.m.gtp6.d.di"))
+	{
+	  kind_fn = SRV6_MOBILE_LOCALSID_END_M_GTP6_D_DI;
+	}
+      else if (!srv6_mobile_strcmp_with_size (
+		 (char *) mp->behavior, behavior_size, "end.m.gtp6.d.dt4"))
+	{
+	  kind_fn = SRV6_MOBILE_LOCALSID_END_M_GTP6_D_DT4;
+	  dt_type = SRV6_GTP6_DT4;
+	}
+      else if (!srv6_mobile_strcmp_with_size (
+		 (char *) mp->behavior, behavior_size, "end.m.gtp6.d.dt6"))
+	{
+	  kind_fn = SRV6_MOBILE_LOCALSID_END_M_GTP6_D_DT6;
+	  dt_type = SRV6_GTP6_DT6;
+	}
+      else if (!srv6_mobile_strcmp_with_size (
+		 (char *) mp->behavior, behavior_size, "end.m.gtp6.d.dt46"))
+	{
+	  kind_fn = SRV6_MOBILE_LOCALSID_END_M_GTP6_D_DT46;
+	  dt_type = SRV6_GTP6_DT46;
+	}
+      else
+	{
+	  return;
+	}
+      switch (kind_fn)
+	{
+	case SRV6_MOBILE_LOCALSID_END_M_GTP4_E:
+	  alloc_param_srv6_end_m_gtp4_e (&ls_plugin_mem, &mp->v4src_addr,
+					 ntohl (mp->v4src_position),
+					 ntohl (mp->fib_table));
+	  break;
+	case SRV6_MOBILE_LOCALSID_END_M_GTP6_E:
+	  alloc_param_srv6_end_m_gtp6_e (&ls_plugin_mem,
+					 ntohl (mp->fib_table));
+	  break;
+	case SRV6_MOBILE_LOCALSID_END_M_GTP6_D:
+	  alloc_param_srv6_end_m_gtp6_d (
+	    &ls_plugin_mem, &mp->sr_prefix.address, mp->sr_prefix.len,
+	    (u8) ntohl (mp->nhtype), mp->drop_in, ntohl (mp->fib_table));
+	  break;
+	case SRV6_MOBILE_LOCALSID_END_M_GTP6_D_DI:
+	  alloc_param_srv6_end_m_gtp6_di (
+	    &ls_plugin_mem, &mp->sr_prefix.address, mp->sr_prefix.len,
+	    (u8) ntohl (mp->nhtype));
+	  break;
+	case SRV6_MOBILE_LOCALSID_END_M_GTP6_D_DT4:
+	case SRV6_MOBILE_LOCALSID_END_M_GTP6_D_DT6:
+	case SRV6_MOBILE_LOCALSID_END_M_GTP6_D_DT46:
+	  alloc_param_srv6_end_m_gtp6_dt (
+	    &ls_plugin_mem, ntohl (mp->fib_table), ntohl (mp->local_fib_table),
+	    dt_type);
+	  break;
+	case SRV6_MOBILE_LOCALSID_UNKNOWN_FUNCTION:
+	default:
+	  return; // error
+	}
+      behavior = sr_plugin_localsid_fn_num_find_by (sm, (char *) mp->behavior,
+						    behavior_size);
+      if (behavior == UINT16_MAX)
+	return;
+    }
+  else
+    {
+      return;
+    }
+  ip6_address_decode (mp->localsid_prefix.address, &localsid);
+  localsid_prefix_len = mp->localsid_prefix.len;
+
+  rv = sr_cli_localsid (mp->is_del, &localsid, localsid_prefix_len,
+			0, // ignore end_psp
+			behavior,
+			0, // ignore sw_if_index
+			0, // ignore vlan_index
+			ntohl (mp->fib_table),
+			NULL, // ignore nh_addr
+			0,    // ignore usid_len
+			ls_plugin_mem);
+
+  REPLY_MACRO (VL_API_SR_MOBILE_LOCALSID_ADD_DEL_REPLY);
+}
+
+static void
+vl_api_sr_mobile_policy_add_t_handler (vl_api_sr_mobile_policy_add_t *mp)
+{
+  ip6_sr_main_t *sm = &sr_main;
+  vl_api_sr_mobile_policy_add_reply_t *rmp;
+  ip6_address_t bsid_addr;
+  ip6_address_t encap_src;
+  void *ls_plugin_mem = 0;
+  u16 behavior = 0;
+  size_t behavior_size = 0;
+
+  u32 dt_type;
+  mobile_policy_function_list_t kind_fn = SRV6_MOBILE_POLICY_UNKNOWN_FUNCTION;
+
+  ip6_address_decode (mp->bsid_addr, &bsid_addr);
+  ip6_address_decode (mp->encap_src, &encap_src);
+  if (ip6_address_is_zero (&encap_src))
+    {
+      encap_src = *sr_get_encaps_source ();
+    }
+  mp->behavior[sizeof (mp->behavior) - 1] = '\0';
+  behavior_size = sizeof (mp->behavior);
+
+  // search behavior index
+  if (mp->behavior[0])
+    {
+      if (!srv6_mobile_strcmp_with_size ((char *) mp->behavior, behavior_size,
+					 "t.m.gtp4.d"))
+	{
+	  kind_fn = SRV6_MOBILE_POLICY_T_M_GTP4_D;
+	}
+      else if (!srv6_mobile_strcmp_with_size ((char *) mp->behavior,
+					      behavior_size, "t.m.gtp4.dt4"))
+	{
+	  kind_fn = SRV6_MOBILE_POLICY_T_M_GTP4_DT4;
+	  dt_type = SRV6_GTP4_DT4;
+	}
+      else if (!srv6_mobile_strcmp_with_size ((char *) mp->behavior,
+					      behavior_size, "t.m.gtp4.dt6"))
+	{
+	  kind_fn = SRV6_MOBILE_POLICY_T_M_GTP4_DT6;
+	  dt_type = SRV6_GTP4_DT6;
+	}
+      else if (!srv6_mobile_strcmp_with_size ((char *) mp->behavior,
+					      behavior_size, "t.m.gtp4.dt46"))
+	{
+	  kind_fn = SRV6_MOBILE_POLICY_T_M_GTP4_DT46;
+	  dt_type = SRV6_GTP4_DT46;
+	}
+      else if (!srv6_mobile_strcmp_with_size ((char *) mp->behavior,
+					      behavior_size, "end.m.gtp6.d"))
+	{
+	  kind_fn = SRV6_MOBILE_POLICY_END_M_GTP6_D;
+	}
+      else
+	{
+	  return;
+	}
+
+      switch (kind_fn)
+	{
+	case SRV6_MOBILE_POLICY_T_M_GTP4_D:
+	  alloc_param_srv6_t_m_gtp4_d (
+	    &ls_plugin_mem, &mp->v6src_prefix.address, mp->v6src_prefix.len,
+	    &mp->sr_prefix.address, mp->sr_prefix.len, ntohl (mp->fib_table),
+	    mp->nhtype, mp->drop_in);
+	  break;
+	case SRV6_MOBILE_POLICY_END_M_GTP6_D:
+	  alloc_param_srv6_end_m_gtp6_d (
+	    &ls_plugin_mem, &mp->sr_prefix.address, mp->sr_prefix.len,
+	    mp->nhtype, mp->drop_in, ntohl (mp->fib_table));
+	  break;
+	case SRV6_MOBILE_POLICY_T_M_GTP4_DT4:
+	case SRV6_MOBILE_POLICY_T_M_GTP4_DT6:
+	case SRV6_MOBILE_POLICY_T_M_GTP4_DT46:
+	  alloc_param_srv6_t_m_gtp4_dt (&ls_plugin_mem, ntohl (mp->fib_table),
+					ntohl (mp->local_fib_table), dt_type);
+	  break;
+	case SRV6_MOBILE_POLICY_UNKNOWN_FUNCTION:
+	default:
+	  return; // error
+	}
+
+      behavior = sr_plugin_policy_fn_num_find_by (sm, (char *) mp->behavior,
+						  behavior_size);
+      if (behavior == UINT16_MAX)
+	return;
+    }
+  else
+    {
+      return;
+    }
+
+  int rv = 0;
+  ip6_address_t *segments = 0, *this_seg;
+  vec_add2 (segments, this_seg, 1);
+  clib_memset (this_seg, 0, sizeof (*this_seg));
+
+  rv = sr_policy_add (&bsid_addr,
+		      segments, // ignore segments
+		      &encap_src,
+		      (u32) ~0,		      // ignore weight
+		      SR_POLICY_TYPE_DEFAULT, // ignore type
+		      (u32) ~0,		      // ignore fib_table
+		      1,		      // ignore is_encap,
+		      behavior, ls_plugin_mem);
+  vec_free (segments);
+  REPLY_MACRO (VL_API_SR_MOBILE_POLICY_ADD_REPLY);
+}
+
+#include <srv6-mobile/sr_mobile.api.c>
+static clib_error_t *
+sr_mobile_api_hookup (vlib_main_t *vm)
+{
+  /*
+   * Set up the (msg_name, crc, message-id) table
+   */
+  REPLY_MSG_ID_BASE = setup_message_id_table ();
+
+  return 0;
+}
+
+VLIB_API_INIT_FUNCTION (sr_mobile_api_hookup);
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */