VPP-598: tcp stack initial commit

Change-Id: I49e5ce0aae6e4ff634024387ceaf7dbc432a0351
Signed-off-by: Dave Barach <dave@barachs.net>
Signed-off-by: Florin Coras <fcoras@cisco.com>

1 files changed, 250 insertions, 0 deletions

diff --git a/src/vnet/session/transport.h b/src/vnet/session/transport.h
new file mode 100644
index 00000000000..2d4415ba6a3
--- /dev/null
+++ b/src/vnet/session/transport.h
@@ -0,0 +1,250 @@
+/*
+ * 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.
+ */
+
+#ifndef VNET_VNET_URI_TRANSPORT_H_
+#define VNET_VNET_URI_TRANSPORT_H_
+
+#include <vnet/vnet.h>
+#include <vnet/ip/ip.h>
+#include <vppinfra/bihash_16_8.h>
+#include <vppinfra/bihash_48_8.h>
+
+/*
+ * Protocol independent transport properties associated to a session
+ */
+typedef struct _transport_connection
+{
+  ip46_address_t rmt_ip;	/**< Remote IP */
+  ip46_address_t lcl_ip;	/**< Local IP */
+  u16 lcl_port;			/**< Local port */
+  u16 rmt_port;			/**< Remote port */
+  u8 proto;			/**< Transport protocol id */
+
+  u32 s_index;			/**< Parent session index */
+  u32 c_index;			/**< Connection index in transport pool */
+  u8 is_ip4;			/**< Flag if IP4 connection */
+  u32 thread_index;		/**< Worker-thread index */
+
+  /** Macros for 'derived classes' where base is named "connection" */
+#define c_lcl_ip connection.lcl_ip
+#define c_rmt_ip connection.rmt_ip
+#define c_lcl_ip4 connection.lcl_ip.ip4
+#define c_rmt_ip4 connection.rmt_ip.ip4
+#define c_lcl_ip6 connection.lcl_ip.ip6
+#define c_rmt_ip6 connection.rmt_ip.ip6
+#define c_lcl_port connection.lcl_port
+#define c_rmt_port connection.rmt_port
+#define c_proto connection.proto
+#define c_state connection.state
+#define c_s_index connection.s_index
+#define c_c_index connection.c_index
+#define c_is_ip4 connection.is_ip4
+#define c_thread_index connection.thread_index
+} transport_connection_t;
+
+/*
+ * Transport protocol virtual function table
+ */
+typedef struct _transport_proto_vft
+{
+  /*
+   * Setup
+   */
+  u32 (*bind) (vlib_main_t *, u32, ip46_address_t *, u16);
+  u32 (*unbind) (vlib_main_t *, u32);
+  int (*open) (ip46_address_t * addr, u16 port_host_byte_order);
+  void (*close) (u32 conn_index, u32 thread_index);
+  void (*cleanup) (u32 conn_index, u32 thread_index);
+
+  /*
+   * Transmission
+   */
+    u32 (*push_header) (transport_connection_t * tconn, vlib_buffer_t * b);
+    u16 (*send_mss) (transport_connection_t * tc);
+    u32 (*send_space) (transport_connection_t * tc);
+    u32 (*rx_fifo_offset) (transport_connection_t * tc);
+
+  /*
+   * Connection retrieval
+   */
+  transport_connection_t *(*get_connection) (u32 conn_idx, u32 thread_idx);
+  transport_connection_t *(*get_listener) (u32 conn_index);
+  transport_connection_t *(*get_half_open) (u32 conn_index);
+
+  /*
+   * Format
+   */
+  u8 *(*format_connection) (u8 * s, va_list * args);
+  u8 *(*format_listener) (u8 * s, va_list * args);
+  u8 *(*format_half_open) (u8 * s, va_list * args);
+
+} transport_proto_vft_t;
+
+/* 16 octets */
+typedef CLIB_PACKED (struct
+		     {
+		     union
+		     {
+		     struct
+		     {
+		     ip4_address_t src; ip4_address_t dst;
+		     u16 src_port;
+		     u16 dst_port;
+		     /* align by making this 4 octets even though its a 1-bit field
+		      * NOTE: avoid key overlap with other transports that use 5 tuples for
+		      * session identification.
+		      */
+		     u32 proto;
+		     };
+		     u64 as_u64[2];
+		     };
+		     }) v4_connection_key_t;
+
+typedef CLIB_PACKED (struct
+		     {
+		     union
+		     {
+		     struct
+		     {
+		     /* 48 octets */
+		     ip6_address_t src; ip6_address_t dst;
+		     u16 src_port;
+		     u16 dst_port; u32 proto; u8 unused_for_now[8];
+		     }; u64 as_u64[6];
+		     };
+		     }) v6_connection_key_t;
+
+typedef clib_bihash_kv_16_8_t session_kv4_t;
+typedef clib_bihash_kv_48_8_t session_kv6_t;
+
+always_inline void
+make_v4_ss_kv (session_kv4_t * kv, ip4_address_t * lcl, ip4_address_t * rmt,
+	       u16 lcl_port, u16 rmt_port, u8 proto)
+{
+  v4_connection_key_t key;
+  memset (&key, 0, sizeof (v4_connection_key_t));
+
+  key.src.as_u32 = lcl->as_u32;
+  key.dst.as_u32 = rmt->as_u32;
+  key.src_port = lcl_port;
+  key.dst_port = rmt_port;
+  key.proto = proto;
+
+  kv->key[0] = key.as_u64[0];
+  kv->key[1] = key.as_u64[1];
+  kv->value = ~0ULL;
+}
+
+always_inline void
+make_v4_listener_kv (session_kv4_t * kv, ip4_address_t * lcl, u16 lcl_port,
+		     u8 proto)
+{
+  v4_connection_key_t key;
+  memset (&key, 0, sizeof (v4_connection_key_t));
+
+  key.src.as_u32 = lcl->as_u32;
+  key.dst.as_u32 = 0;
+  key.src_port = lcl_port;
+  key.dst_port = 0;
+  key.proto = proto;
+
+  kv->key[0] = key.as_u64[0];
+  kv->key[1] = key.as_u64[1];
+  kv->value = ~0ULL;
+}
+
+always_inline void
+make_v4_ss_kv_from_tc (session_kv4_t * kv, transport_connection_t * t)
+{
+  return make_v4_ss_kv (kv, &t->lcl_ip.ip4, &t->rmt_ip.ip4, t->lcl_port,
+			t->rmt_port, t->proto);
+}
+
+always_inline void
+make_v6_ss_kv (session_kv6_t * kv, ip6_address_t * lcl, ip6_address_t * rmt,
+	       u16 lcl_port, u16 rmt_port, u8 proto)
+{
+  v6_connection_key_t key;
+  memset (&key, 0, sizeof (v6_connection_key_t));
+
+  key.src.as_u64[0] = lcl->as_u64[0];
+  key.src.as_u64[1] = lcl->as_u64[1];
+  key.dst.as_u64[0] = rmt->as_u64[0];
+  key.dst.as_u64[1] = rmt->as_u64[1];
+  key.src_port = lcl_port;
+  key.dst_port = rmt_port;
+  key.proto = proto;
+
+  kv->key[0] = key.as_u64[0];
+  kv->key[1] = key.as_u64[1];
+  kv->value = ~0ULL;
+}
+
+always_inline void
+make_v6_listener_kv (session_kv6_t * kv, ip6_address_t * lcl, u16 lcl_port,
+		     u8 proto)
+{
+  v6_connection_key_t key;
+  memset (&key, 0, sizeof (v6_connection_key_t));
+
+  key.src.as_u64[0] = lcl->as_u64[0];
+  key.src.as_u64[1] = lcl->as_u64[1];
+  key.dst.as_u64[0] = 0;
+  key.dst.as_u64[1] = 0;
+  key.src_port = lcl_port;
+  key.dst_port = 0;
+  key.proto = proto;
+
+  kv->key[0] = key.as_u64[0];
+  kv->key[1] = key.as_u64[1];
+  kv->value = ~0ULL;
+}
+
+always_inline void
+make_v6_ss_kv_from_tc (session_kv6_t * kv, transport_connection_t * t)
+{
+  make_v6_ss_kv (kv, &t->lcl_ip.ip6, &t->rmt_ip.ip6, t->lcl_port,
+		 t->rmt_port, t->proto);
+}
+
+typedef struct _transport_endpoint
+{
+  ip46_address_t ip;
+  u16 port;
+  u8 is_ip4;
+  u32 vrf;
+} transport_endpoint_t;
+
+typedef clib_bihash_24_8_t transport_endpoint_table_t;
+
+#define TRANSPORT_ENDPOINT_INVALID_INDEX ((u32)~0)
+
+u32
+transport_endpoint_lookup (transport_endpoint_table_t * ht,
+			   ip46_address_t * ip, u16 port);
+void transport_endpoint_table_add (transport_endpoint_table_t * ht,
+				   transport_endpoint_t * te, u32 value);
+void transport_endpoint_table_del (transport_endpoint_table_t * ht,
+				   transport_endpoint_t * te);
+
+#endif /* VNET_VNET_URI_TRANSPORT_H_ */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */