Initial GENEVE TUNNEL implementation and tests.

Notes on this first implementation:
* First version of the implementation does NOT support GENEVE OPTIONS
HEADER: it isn't well understood what the purpose of the OPTIONS will be and/or
what content would be placed in the variable option data;

Once the IETF work will evolve and further information will be available
it could be possible to modify the frame rewrite to contemplate the
actual GENEVE OPTIONS.

Change-Id: Iddfe6f408cc45bb0800f00ce6a3e302e48a4ed52
Signed-off-by: Marco Varlese <marco.varlese@suse.com>

1 files changed, 213 insertions, 0 deletions

diff --git a/src/vnet/geneve/geneve.h b/src/vnet/geneve/geneve.h
new file mode 100644
index 00000000000..2976043ed0f
--- /dev/null
+++ b/src/vnet/geneve/geneve.h
@@ -0,0 +1,213 @@
+/*
+ * Copyright (c) 2017 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.
+ */
+#ifndef included_vnet_geneve_h
+#define included_vnet_geneve_h
+
+#include <vppinfra/error.h>
+#include <vppinfra/hash.h>
+#include <vnet/vnet.h>
+#include <vnet/ip/ip.h>
+#include <vnet/l2/l2_input.h>
+#include <vnet/l2/l2_output.h>
+#include <vnet/l2/l2_bd.h>
+#include <vnet/ethernet/ethernet.h>
+#include <vnet/geneve/geneve_packet.h>
+#include <vnet/ip/ip4_packet.h>
+#include <vnet/ip/ip6_packet.h>
+#include <vnet/udp/udp.h>
+#include <vnet/dpo/dpo.h>
+#include <vnet/adj/adj_types.h>
+
+#define SUPPORT_OPTIONS_HEADER 0
+
+typedef CLIB_PACKED (struct
+		     {
+		     ip4_header_t ip4;	/* 20 bytes */
+		     udp_header_t udp;	/* 8 bytes */
+		     geneve_header_t geneve;	/* Min 8 bytes, Max 260 bytes */
+		     }) ip4_geneve_header_t;
+
+typedef CLIB_PACKED (struct
+		     {
+		     ip6_header_t ip6;	/* 40 bytes */
+		     udp_header_t udp;	/* 8 bytes */
+		     geneve_header_t geneve;	/* Min 8 bytes, Max 260 bytes */
+		     }) ip6_geneve_header_t;
+
+typedef CLIB_PACKED (struct
+		     {
+		     /*
+		      * Key fields: ip source and geneve vni on incoming GENEVE packet
+		      * all fields in NET byte order
+		      */
+		     union
+		     {
+		     struct
+		     {
+		     u32 remote;
+		     u32 vni;	/* shifted left 8 bits */
+		     };
+		     u64 as_u64;
+		     };
+		     }) geneve4_tunnel_key_t;
+
+typedef CLIB_PACKED (struct
+		     {
+		     /*
+		      * Key fields: ip source and geneve vni on incoming GENEVE packet
+		      * all fields in NET byte order
+		      */
+		     ip6_address_t remote;
+		     u32 vni;	/* shifted left 8 bits */
+		     }) geneve6_tunnel_key_t;
+
+typedef struct
+{
+  /* Rewrite string. $$$$ embed vnet_rewrite header */
+  u8 *rewrite;
+
+  /* FIB DPO for IP forwarding of GENEVE encap packet */
+  dpo_id_t next_dpo;
+
+  /* geneve VNI in HOST byte order */
+  u32 vni;
+
+  /* geneve OPTIONS LEN in HOST byte order */
+#if SUPPORT_OPTIONS_HEADER==1
+  u8 options_len;
+#endif
+
+  /* tunnel local and remote addresses */
+  ip46_address_t local;
+  ip46_address_t remote;
+
+  /* mcast packet output intfc index (used only if remote is mcast) */
+  u32 mcast_sw_if_index;
+
+  /* decap next index */
+  u32 decap_next_index;
+
+  /* The FIB index for local/remote addresses */
+  u32 encap_fib_index;
+
+  /* vnet intfc index */
+  u32 sw_if_index;
+  u32 hw_if_index;
+
+  /**
+   * Linkage into the FIB object graph
+   */
+  fib_node_t node;
+
+  /*
+   * The FIB entry for (depending on GENEVE tunnel is unicast or mcast)
+   * sending unicast GENEVE encap packets or receiving mcast GENEVE packets
+   */
+  fib_node_index_t fib_entry_index;
+  adj_index_t mcast_adj_index;
+
+  /**
+   * The tunnel is a child of the FIB entry for its desintion. This is
+   * so it receives updates when the forwarding information for that entry
+   * changes.
+   * The tunnels sibling index on the FIB entry's dependency list.
+   */
+  u32 sibling_index;
+} geneve_tunnel_t;
+
+#define foreach_geneve_input_next        \
+_(DROP, "error-drop")                   \
+_(L2_INPUT, "l2-input")
+
+typedef enum
+{
+#define _(s,n) GENEVE_INPUT_NEXT_##s,
+  foreach_geneve_input_next
+#undef _
+    GENEVE_INPUT_N_NEXT,
+} geneve_input_next_t;
+
+typedef enum
+{
+#define geneve_error(n,s) GENEVE_ERROR_##n,
+#include <vnet/geneve/geneve_error.def>
+#undef geneve_error
+  GENEVE_N_ERROR,
+} geneve_input_error_t;
+
+typedef struct
+{
+  /* vector of encap tunnel instances */
+  geneve_tunnel_t *tunnels;
+
+  /* lookup tunnel by key */
+  uword *geneve4_tunnel_by_key;	/* keyed on ipv4.remote + vni */
+  uword *geneve6_tunnel_by_key;	/* keyed on ipv6.remote + vni */
+
+  /* local VTEP IPs ref count used by geneve-bypass node to check if
+     received GENEVE packet DIP matches any local VTEP address */
+  uword *vtep4;			/* local ip4 VTEPs keyed on their ip4 addr */
+  uword *vtep6;			/* local ip6 VTEPs keyed on their ip6 addr */
+
+  /* mcast shared info */
+  uword *mcast_shared;		/* keyed on mcast ip46 addr */
+
+  /* Free vlib hw_if_indices */
+  u32 *free_geneve_tunnel_hw_if_indices;
+
+  /* Mapping from sw_if_index to tunnel index */
+  u32 *tunnel_index_by_sw_if_index;
+
+  /* convenience */
+  vlib_main_t *vlib_main;
+  vnet_main_t *vnet_main;
+} geneve_main_t;
+
+geneve_main_t geneve_main;
+
+extern vlib_node_registration_t geneve4_input_node;
+extern vlib_node_registration_t geneve6_input_node;
+extern vlib_node_registration_t geneve4_encap_node;
+extern vlib_node_registration_t geneve6_encap_node;
+
+u8 *format_geneve_encap_trace (u8 * s, va_list * args);
+
+typedef struct
+{
+  u8 is_add;
+
+  /* we normally use is_ip4, but since this adds to the
+   * structure, this seems less of abreaking change */
+  u8 is_ip6;
+  ip46_address_t local, remote;
+  u32 mcast_sw_if_index;
+  u32 encap_fib_index;
+  u32 decap_next_index;
+  u32 vni;
+} vnet_geneve_add_del_tunnel_args_t;
+
+int vnet_geneve_add_del_tunnel
+  (vnet_geneve_add_del_tunnel_args_t * a, u32 * sw_if_indexp);
+
+void vnet_int_geneve_bypass_mode (u32 sw_if_index, u8 is_ip6, u8 is_enable);
+#endif /* included_vnet_geneve_h */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */