1 files changed, 220 insertions, 0 deletions
diff --git a/src/vnet/bfd/bfd_main.h b/src/vnet/bfd/bfd_main.h
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+++ b/src/vnet/bfd/bfd_main.h
@@ -0,0 +1,220 @@
+/*
+ * Copyright (c) 2011-2016 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.
+ */
+/**
+ * @file
+ * @brief BFD global declarations
+ */
+#ifndef __included_bfd_main_h__
+#define __included_bfd_main_h__
+
+#include <vppinfra/timing_wheel.h>
+#include <vnet/vnet.h>
+#include <vnet/bfd/bfd_protocol.h>
+#include <vnet/bfd/bfd_udp.h>
+
+#define foreach_bfd_transport(F) \
+  F (UDP4, "ip4-rewrite")  \
+  F (UDP6, "ip6-rewrite")
+
+typedef enum
+{
+#define F(t, n) BFD_TRANSPORT_##t,
+  foreach_bfd_transport (F)
+#undef F
+} bfd_transport_t;
+
+#define foreach_bfd_mode(F) \
+  F (asynchronous)          \
+  F (demand)
+
+typedef enum
+{
+#define F(x) BFD_MODE_##x,
+  foreach_bfd_mode (F)
+#undef F
+} bfd_mode_e;
+
+typedef struct
+{
+  /* index in bfd_main.sessions pool */
+  u32 bs_idx;
+
+  /* session state */
+  bfd_state_e local_state;
+
+  /* local diagnostics */
+  bfd_diag_code_e local_diag;
+
+  /* remote session state */
+  bfd_state_e remote_state;
+
+  /* local discriminator */
+  u32 local_discr;
+
+  /* remote discriminator */
+  u32 remote_discr;
+
+  /* configured desired min tx interval (microseconds) */
+  u32 config_desired_min_tx_us;
+
+  /* desired min tx interval (microseconds) */
+  u32 desired_min_tx_us;
+
+  /* desired min tx interval (clocks) */
+  u64 desired_min_tx_clocks;
+
+  /* required min rx interval */
+  u32 required_min_rx_us;
+
+  /* remote min rx interval (microseconds) */
+  u32 remote_min_rx_us;
+
+  /* remote min rx interval (clocks) */
+  u64 remote_min_rx_clocks;
+
+  /* remote desired min tx interval */
+  u32 remote_desired_min_tx_us;
+
+  /* 1 if in demand mode, 0 otherwise */
+  u8 local_demand;
+
+  /* 1 if remote system sets demand mode, 0 otherwise */
+  u8 remote_demand;
+
+  /* local detect multiplier */
+  u8 local_detect_mult;
+
+  /* remote detect multiplier */
+  u8 remote_detect_mult;
+
+  /* set to value of timer in timing wheel, 0 if never set */
+  u64 wheel_time_clocks;
+
+  /* transmit interval */
+  u64 transmit_interval_clocks;
+
+  /* next time at which to transmit a packet */
+  u64 tx_timeout_clocks;
+
+  /* timestamp of last packet received */
+  u64 last_rx_clocks;
+
+  /* detection time */
+  u64 detection_time_clocks;
+
+  /* transport type for this session */
+  bfd_transport_t transport;
+
+  union
+  {
+    bfd_udp_session_t udp;
+  };
+} bfd_session_t;
+
+typedef struct
+{
+  u32 client_index;
+  u32 client_pid;
+} event_subscriber_t;
+
+typedef struct
+{
+  /* pool of bfd sessions context data */
+  bfd_session_t *sessions;
+
+  /* timing wheel for scheduling timeouts */
+  timing_wheel_t wheel;
+
+  /* timing wheel inaccuracy, in clocks */
+  u64 wheel_inaccuracy;
+
+  /* hashmap - bfd session by discriminator */
+  u32 *session_by_disc;
+
+  /* background process node index */
+  u32 bfd_process_node_index;
+
+  /* convenience variables */
+  vlib_main_t *vlib_main;
+  vnet_main_t *vnet_main;
+
+  /* cpu clocks per second */
+  f64 cpu_cps;
+
+  /* for generating random numbers */
+  u32 random_seed;
+
+} bfd_main_t;
+
+extern bfd_main_t bfd_main;
+
+/* Packet counters */
+#define foreach_bfd_error(F)               \
+  F (NONE, "good bfd packets (processed)") \
+  F (BAD, "invalid bfd packets")           \
+  F (DISABLED, "bfd packets received on disabled interfaces")
+
+typedef enum
+{
+#define F(sym, str) BFD_ERROR_##sym,
+  foreach_bfd_error (F)
+#undef F
+    BFD_N_ERROR,
+} bfd_error_t;
+
+/* bfd packet trace capture */
+typedef struct
+{
+  u32 len;
+  u8 data[400];
+} bfd_input_trace_t;
+
+enum
+{
+  BFD_EVENT_RESCHEDULE = 1,
+  BFD_EVENT_NEW_SESSION,
+} bfd_process_event_e;
+
+u8 *bfd_input_format_trace (u8 * s, va_list * args);
+
+bfd_session_t *bfd_get_session (bfd_main_t * bm, bfd_transport_t t);
+void bfd_put_session (bfd_main_t * bm, bfd_session_t * bs);
+bfd_session_t *bfd_find_session_by_idx (bfd_main_t * bm, uword bs_idx);
+bfd_session_t *bfd_find_session_by_disc (bfd_main_t * bm, u32 disc);
+void bfd_session_start (bfd_main_t * bm, bfd_session_t * bs);
+void bfd_consume_pkt (bfd_main_t * bm, const bfd_pkt_t * bfd, u32 bs_idx);
+int bfd_verify_pkt_common (const bfd_pkt_t * pkt);
+int bfd_verify_pkt_session (const bfd_pkt_t * pkt, u16 pkt_size,
+			    const bfd_session_t * bs);
+void bfd_event (bfd_main_t * bm, bfd_session_t * bs);
+void bfd_send_final (vlib_main_t * vm, vlib_buffer_t * b, bfd_session_t * bs);
+u8 *format_bfd_session (u8 * s, va_list * args);
+
+
+#define USEC_PER_MS 1000LL
+#define USEC_PER_SECOND (1000 * USEC_PER_MS)
+
+/* default, slow transmission interval for BFD packets, per spec at least 1s */
+#define BFD_DEFAULT_DESIRED_MIN_TX_US USEC_PER_SECOND
+
+#endif /* __included_bfd_main_h__ */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */