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-rw-r--r--src/vnet/bfd/bfd_main.c969
1 files changed, 969 insertions, 0 deletions
diff --git a/src/vnet/bfd/bfd_main.c b/src/vnet/bfd/bfd_main.c
new file mode 100644
index 00000000..e25eadfc
--- /dev/null
+++ b/src/vnet/bfd/bfd_main.c
@@ -0,0 +1,969 @@
+/*
+ * 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 nodes implementation
+ */
+
+#include <vppinfra/random.h>
+#include <vppinfra/error.h>
+#include <vppinfra/hash.h>
+#include <vnet/ethernet/ethernet.h>
+#include <vnet/ethernet/packet.h>
+#include <vnet/bfd/bfd_debug.h>
+#include <vnet/bfd/bfd_protocol.h>
+#include <vnet/bfd/bfd_main.h>
+
+static u64
+bfd_us_to_clocks (bfd_main_t * bm, u64 us)
+{
+ return bm->cpu_cps * ((f64) us / USEC_PER_SECOND);
+}
+
+static vlib_node_registration_t bfd_process_node;
+
+typedef enum
+{
+#define F(t, n) BFD_OUTPUT_##t,
+ foreach_bfd_transport (F)
+#undef F
+ BFD_OUTPUT_N_NEXT,
+} bfd_output_next_t;
+
+static u32 bfd_next_index_by_transport[] = {
+#define F(t, n) [BFD_TRANSPORT_##t] = BFD_OUTPUT_##t,
+ foreach_bfd_transport (F)
+#undef F
+};
+
+/*
+ * We actually send all bfd pkts to the "error" node after scanning
+ * them, so the graph node has only one next-index. The "error-drop"
+ * node automatically bumps our per-node packet counters for us.
+ */
+typedef enum
+{
+ BFD_INPUT_NEXT_NORMAL,
+ BFD_INPUT_N_NEXT,
+} bfd_input_next_t;
+
+static void bfd_on_state_change (bfd_main_t * bm, bfd_session_t * bs, u64 now,
+ int handling_wakeup);
+
+static void
+bfd_set_defaults (bfd_main_t * bm, bfd_session_t * bs)
+{
+ bs->local_state = BFD_STATE_down;
+ bs->local_diag = BFD_DIAG_CODE_no_diag;
+ bs->remote_state = BFD_STATE_down;
+ bs->local_demand = 0;
+ bs->remote_discr = 0;
+ bs->desired_min_tx_us = BFD_DEFAULT_DESIRED_MIN_TX_US;
+ bs->desired_min_tx_clocks = bfd_us_to_clocks (bm, bs->desired_min_tx_us);
+ bs->remote_min_rx_us = 1;
+ bs->remote_demand = 0;
+}
+
+static void
+bfd_set_diag (bfd_session_t * bs, bfd_diag_code_e code)
+{
+ if (bs->local_diag != code)
+ {
+ BFD_DBG ("set local_diag, bs_idx=%d: '%d:%s'", bs->bs_idx, code,
+ bfd_diag_code_string (code));
+ bs->local_diag = code;
+ }
+}
+
+static void
+bfd_set_state (bfd_main_t * bm, bfd_session_t * bs,
+ bfd_state_e new_state, int handling_wakeup)
+{
+ if (bs->local_state != new_state)
+ {
+ BFD_DBG ("Change state, bs_idx=%d: %s->%s", bs->bs_idx,
+ bfd_state_string (bs->local_state),
+ bfd_state_string (new_state));
+ bs->local_state = new_state;
+ bfd_on_state_change (bm, bs, clib_cpu_time_now (), handling_wakeup);
+ }
+}
+
+static void
+bfd_recalc_tx_interval (bfd_main_t * bm, bfd_session_t * bs)
+{
+ if (!bs->local_demand)
+ {
+ bs->transmit_interval_clocks =
+ clib_max (bs->desired_min_tx_clocks, bs->remote_min_rx_clocks);
+ }
+ else
+ {
+ /* TODO */
+ }
+ BFD_DBG ("Recalculated transmit interval %lu clocks/%.2fs",
+ bs->transmit_interval_clocks,
+ bs->transmit_interval_clocks / bm->cpu_cps);
+}
+
+static void
+bfd_calc_next_tx (bfd_main_t * bm, bfd_session_t * bs, u64 now)
+{
+ if (!bs->local_demand)
+ {
+ if (bs->local_detect_mult > 1)
+ {
+ /* common case - 75-100% of transmit interval */
+ bs->tx_timeout_clocks = now +
+ (1 - .25 * (random_f64 (&bm->random_seed))) *
+ bs->transmit_interval_clocks;
+ if (bs->tx_timeout_clocks < now)
+ {
+ /* huh, we've missed it already, skip the missed events */
+ const u64 missed =
+ (now - bs->tx_timeout_clocks) / bs->transmit_interval_clocks;
+ BFD_ERR ("Missed %lu transmit events (now is %lu, calc "
+ "tx_timeout is %lu)!",
+ missed, now, bs->tx_timeout_clocks);
+ bs->tx_timeout_clocks +=
+ (missed + 1) * bs->transmit_interval_clocks;
+ }
+ }
+ else
+ {
+ /* special case - 75-90% of transmit interval */
+ bs->tx_timeout_clocks =
+ now +
+ (.9 - .15 * (random_f64 (&bm->random_seed))) *
+ bs->transmit_interval_clocks;
+ if (bs->tx_timeout_clocks < now)
+ {
+ /* huh, we've missed it already, skip the missed events */
+ const u64 missed =
+ (now - bs->tx_timeout_clocks) / bs->transmit_interval_clocks;
+ BFD_ERR ("Missed %lu transmit events (now is %lu, calc "
+ "tx_timeout is %lu)!",
+ missed, now, bs->tx_timeout_clocks);
+ bs->tx_timeout_clocks +=
+ (missed + 1) * bs->transmit_interval_clocks;
+ }
+ }
+ }
+ else
+ {
+ /* TODO */
+ }
+ if (bs->tx_timeout_clocks)
+ {
+ BFD_DBG ("Next transmit in %lu clocks/%.02fs@%lu",
+ bs->tx_timeout_clocks - now,
+ (bs->tx_timeout_clocks - now) / bm->cpu_cps,
+ bs->tx_timeout_clocks);
+ }
+}
+
+static void
+bfd_recalc_detection_time (bfd_main_t * bm, bfd_session_t * bs)
+{
+ if (!bs->local_demand)
+ {
+ bs->detection_time_clocks =
+ bs->remote_detect_mult *
+ bfd_us_to_clocks (bm, clib_max (bs->required_min_rx_us,
+ bs->remote_desired_min_tx_us));
+ }
+ else
+ {
+ bs->detection_time_clocks =
+ bs->local_detect_mult *
+ bfd_us_to_clocks (bm,
+ clib_max (bs->desired_min_tx_us,
+ bs->remote_min_rx_us));
+ }
+ BFD_DBG ("Recalculated detection time %lu clocks/%.2fs",
+ bs->detection_time_clocks,
+ bs->detection_time_clocks / bm->cpu_cps);
+}
+
+static void
+bfd_set_timer (bfd_main_t * bm, bfd_session_t * bs, u64 now,
+ int handling_wakeup)
+{
+ u64 next = 0;
+ u64 rx_timeout = 0;
+ if (BFD_STATE_up == bs->local_state)
+ {
+ rx_timeout = bs->last_rx_clocks + bs->detection_time_clocks;
+ }
+ if (bs->tx_timeout_clocks && rx_timeout)
+ {
+ next = clib_min (bs->tx_timeout_clocks, rx_timeout);
+ }
+ else if (bs->tx_timeout_clocks)
+ {
+ next = bs->tx_timeout_clocks;
+ }
+ else if (rx_timeout)
+ {
+ next = rx_timeout;
+ }
+ BFD_DBG ("bs_idx=%u, tx_timeout=%lu, rx_timeout=%lu, next=%s", bs->bs_idx,
+ bs->tx_timeout_clocks, rx_timeout,
+ next == bs->tx_timeout_clocks ? "tx" : "rx");
+ /* sometimes the wheel expires an event a bit sooner than requested, account
+ for that here */
+ if (next && (now + bm->wheel_inaccuracy > bs->wheel_time_clocks ||
+ next < bs->wheel_time_clocks || !bs->wheel_time_clocks))
+ {
+ bs->wheel_time_clocks = next;
+ BFD_DBG ("timing_wheel_insert(%p, %lu (%ld clocks/%.2fs in the "
+ "future), %u);",
+ &bm->wheel, bs->wheel_time_clocks,
+ (i64) bs->wheel_time_clocks - clib_cpu_time_now (),
+ (i64) (bs->wheel_time_clocks - clib_cpu_time_now ()) /
+ bm->cpu_cps, bs->bs_idx);
+ timing_wheel_insert (&bm->wheel, bs->wheel_time_clocks, bs->bs_idx);
+ if (!handling_wakeup)
+ {
+ vlib_process_signal_event (bm->vlib_main,
+ bm->bfd_process_node_index,
+ BFD_EVENT_RESCHEDULE, bs->bs_idx);
+ }
+ }
+}
+
+static void
+bfd_set_desired_min_tx (bfd_main_t * bm, bfd_session_t * bs, u64 now,
+ u32 desired_min_tx_us, int handling_wakeup)
+{
+ bs->desired_min_tx_us = desired_min_tx_us;
+ bs->desired_min_tx_clocks = bfd_us_to_clocks (bm, bs->desired_min_tx_us);
+ BFD_DBG ("Set desired min tx to %uus/%lu clocks/%.2fs",
+ bs->desired_min_tx_us, bs->desired_min_tx_clocks,
+ bs->desired_min_tx_clocks / bm->cpu_cps);
+ bfd_recalc_detection_time (bm, bs);
+ bfd_recalc_tx_interval (bm, bs);
+ bfd_calc_next_tx (bm, bs, now);
+ bfd_set_timer (bm, bs, now, handling_wakeup);
+}
+
+static void
+bfd_set_remote_required_min_rx (bfd_main_t * bm, bfd_session_t * bs,
+ u64 now,
+ u32 remote_required_min_rx_us,
+ int handling_wakeup)
+{
+ bs->remote_min_rx_us = remote_required_min_rx_us;
+ bs->remote_min_rx_clocks = bfd_us_to_clocks (bm, bs->remote_min_rx_us);
+ BFD_DBG ("Set remote min rx to %uus/%lu clocks/%.2fs", bs->remote_min_rx_us,
+ bs->remote_min_rx_clocks, bs->remote_min_rx_clocks / bm->cpu_cps);
+ bfd_recalc_detection_time (bm, bs);
+ bfd_recalc_tx_interval (bm, bs);
+ bfd_calc_next_tx (bm, bs, now);
+ bfd_set_timer (bm, bs, now, handling_wakeup);
+}
+
+void
+bfd_session_start (bfd_main_t * bm, bfd_session_t * bs)
+{
+ BFD_DBG ("%U", format_bfd_session, bs);
+ bfd_recalc_tx_interval (bm, bs);
+ vlib_process_signal_event (bm->vlib_main, bm->bfd_process_node_index,
+ BFD_EVENT_NEW_SESSION, bs->bs_idx);
+}
+
+vnet_api_error_t
+bfd_del_session (uword bs_idx)
+{
+ const bfd_main_t *bm = &bfd_main;
+ if (!pool_is_free_index (bm->sessions, bs_idx))
+ {
+ bfd_session_t *bs = pool_elt_at_index (bm->sessions, bs_idx);
+ pool_put (bm->sessions, bs);
+ return 0;
+ }
+ else
+ {
+ BFD_ERR ("no such session");
+ return VNET_API_ERROR_BFD_NOENT;
+ }
+ return 0;
+}
+
+const char *
+bfd_diag_code_string (bfd_diag_code_e diag)
+{
+#define F(n, t, s) \
+ case BFD_DIAG_CODE_NAME (t): \
+ return s;
+ switch (diag)
+ {
+ foreach_bfd_diag_code (F)}
+ return "UNKNOWN";
+#undef F
+}
+
+const char *
+bfd_state_string (bfd_state_e state)
+{
+#define F(n, t, s) \
+ case BFD_STATE_NAME (t): \
+ return s;
+ switch (state)
+ {
+ foreach_bfd_state (F)}
+ return "UNKNOWN";
+#undef F
+}
+
+vnet_api_error_t
+bfd_session_set_flags (u32 bs_idx, u8 admin_up_down)
+{
+ bfd_main_t *bm = &bfd_main;
+ if (pool_is_free_index (bm->sessions, bs_idx))
+ {
+ BFD_ERR ("invalid bs_idx=%u", bs_idx);
+ return VNET_API_ERROR_BFD_NOENT;
+ }
+ bfd_session_t *bs = pool_elt_at_index (bm->sessions, bs_idx);
+ if (admin_up_down)
+ {
+ bfd_set_state (bm, bs, BFD_STATE_down, 0);
+ }
+ else
+ {
+ bfd_set_diag (bs, BFD_DIAG_CODE_neighbor_sig_down);
+ bfd_set_state (bm, bs, BFD_STATE_admin_down, 0);
+ }
+ return 0;
+}
+
+u8 *
+bfd_input_format_trace (u8 * s, va_list * args)
+{
+ CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
+ CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
+ const bfd_input_trace_t *t = va_arg (*args, bfd_input_trace_t *);
+ const bfd_pkt_t *pkt = (bfd_pkt_t *) t->data;
+ if (t->len > STRUCT_SIZE_OF (bfd_pkt_t, head))
+ {
+ s = format (s, "BFD v%u, diag=%u(%s), state=%u(%s),\n"
+ " flags=(P:%u, F:%u, C:%u, A:%u, D:%u, M:%u), detect_mult=%u, "
+ "length=%u\n",
+ bfd_pkt_get_version (pkt), bfd_pkt_get_diag_code (pkt),
+ bfd_diag_code_string (bfd_pkt_get_diag_code (pkt)),
+ bfd_pkt_get_state (pkt),
+ bfd_state_string (bfd_pkt_get_state (pkt)),
+ bfd_pkt_get_poll (pkt), bfd_pkt_get_final (pkt),
+ bfd_pkt_get_control_plane_independent (pkt),
+ bfd_pkt_get_auth_present (pkt), bfd_pkt_get_demand (pkt),
+ bfd_pkt_get_multipoint (pkt), pkt->head.detect_mult,
+ pkt->head.length);
+ if (t->len >= sizeof (bfd_pkt_t)
+ && pkt->head.length >= sizeof (bfd_pkt_t))
+ {
+ s = format (s, " my discriminator: %u\n", pkt->my_disc);
+ s = format (s, " your discriminator: %u\n", pkt->your_disc);
+ s = format (s, " desired min tx interval: %u\n",
+ clib_net_to_host_u32 (pkt->des_min_tx));
+ s = format (s, " required min rx interval: %u\n",
+ clib_net_to_host_u32 (pkt->req_min_rx));
+ s = format (s, " required min echo rx interval: %u\n",
+ clib_net_to_host_u32 (pkt->req_min_echo_rx));
+ }
+ }
+
+ return s;
+}
+
+static void
+bfd_on_state_change (bfd_main_t * bm, bfd_session_t * bs, u64 now,
+ int handling_wakeup)
+{
+ BFD_DBG ("State changed: %U", format_bfd_session, bs);
+ bfd_event (bm, bs);
+ switch (bs->local_state)
+ {
+ case BFD_STATE_admin_down:
+ bfd_set_desired_min_tx (bm, bs, now,
+ clib_max (bs->config_desired_min_tx_us,
+ BFD_DEFAULT_DESIRED_MIN_TX_US),
+ handling_wakeup);
+ break;
+ case BFD_STATE_down:
+ bfd_set_desired_min_tx (bm, bs, now,
+ clib_max (bs->config_desired_min_tx_us,
+ BFD_DEFAULT_DESIRED_MIN_TX_US),
+ handling_wakeup);
+ break;
+ case BFD_STATE_init:
+ bfd_set_desired_min_tx (bm, bs, now,
+ clib_max (bs->config_desired_min_tx_us,
+ BFD_DEFAULT_DESIRED_MIN_TX_US),
+ handling_wakeup);
+ break;
+ case BFD_STATE_up:
+ bfd_set_desired_min_tx (bm, bs, now, bs->config_desired_min_tx_us,
+ handling_wakeup);
+ break;
+ }
+}
+
+static void
+bfd_add_transport_layer (vlib_main_t * vm, vlib_buffer_t * b,
+ bfd_session_t * bs)
+{
+ switch (bs->transport)
+ {
+ case BFD_TRANSPORT_UDP4:
+ /* fallthrough */
+ case BFD_TRANSPORT_UDP6:
+ BFD_DBG ("Transport bfd via udp, bs_idx=%u", bs->bs_idx);
+ bfd_add_udp_transport (vm, b, &bs->udp);
+ break;
+ }
+}
+
+static vlib_buffer_t *
+bfd_create_frame (vlib_main_t * vm, vlib_node_runtime_t * rt,
+ bfd_session_t * bs)
+{
+ u32 bi;
+ if (vlib_buffer_alloc (vm, &bi, 1) != 1)
+ {
+ clib_warning ("buffer allocation failure");
+ return NULL;
+ }
+
+ vlib_buffer_t *b = vlib_get_buffer (vm, bi);
+ ASSERT (b->current_data == 0);
+
+ u32 *to_next;
+ u32 n_left_to_next;
+
+ vlib_get_next_frame (vm, rt, bfd_next_index_by_transport[bs->transport],
+ to_next, n_left_to_next);
+
+ to_next[0] = bi;
+ n_left_to_next -= 1;
+
+ vlib_put_next_frame (vm, rt, bfd_next_index_by_transport[bs->transport],
+ n_left_to_next);
+ return b;
+}
+
+static void
+bfd_init_control_frame (vlib_buffer_t * b, bfd_session_t * bs)
+{
+ bfd_pkt_t *pkt = vlib_buffer_get_current (b);
+ const u32 bfd_length = 24;
+ memset (pkt, 0, sizeof (*pkt));
+
+ bfd_pkt_set_version (pkt, 1);
+ bfd_pkt_set_diag_code (pkt, bs->local_diag);
+ bfd_pkt_set_state (pkt, bs->local_state);
+ if (bs->local_demand && BFD_STATE_up == bs->local_state &&
+ BFD_STATE_up == bs->remote_state)
+ {
+ bfd_pkt_set_demand (pkt);
+ }
+ pkt->head.detect_mult = bs->local_detect_mult;
+ pkt->head.length = clib_host_to_net_u32 (bfd_length);
+ pkt->my_disc = bs->local_discr;
+ pkt->your_disc = bs->remote_discr;
+ pkt->des_min_tx = clib_host_to_net_u32 (bs->desired_min_tx_us);
+ pkt->req_min_rx = clib_host_to_net_u32 (bs->required_min_rx_us);
+ pkt->req_min_echo_rx = clib_host_to_net_u32 (0); /* FIXME */
+ b->current_length = bfd_length;
+}
+
+static void
+bfd_send_periodic (vlib_main_t * vm, vlib_node_runtime_t * rt,
+ bfd_main_t * bm, bfd_session_t * bs, u64 now,
+ int handling_wakeup)
+{
+ if (!bs->remote_min_rx_us)
+ {
+ BFD_DBG
+ ("bfd.RemoteMinRxInterval is zero, not sending periodic control "
+ "frame");
+ return;
+ }
+ /* FIXME
+ A system MUST NOT periodically transmit BFD Control packets if Demand
+ mode is active on the remote system (bfd.RemoteDemandMode is 1,
+ bfd.SessionState is Up, and bfd.RemoteSessionState is Up) and a Poll
+ Sequence is not being transmitted.
+ */
+ /* sometimes the wheel expires an event a bit sooner than requested, account
+ for that here */
+ if (now + bm->wheel_inaccuracy >= bs->tx_timeout_clocks)
+ {
+ BFD_DBG ("Send periodic control frame for bs_idx=%lu", bs->bs_idx);
+ vlib_buffer_t *b = bfd_create_frame (vm, rt, bs);
+ if (!b)
+ {
+ return;
+ }
+ bfd_init_control_frame (b, bs);
+ bfd_add_transport_layer (vm, b, bs);
+ bfd_calc_next_tx (bm, bs, now);
+ }
+ else
+ {
+ BFD_DBG
+ ("No need to send control frame now, now is %lu, tx_timeout is %lu",
+ now, bs->tx_timeout_clocks);
+ }
+ bfd_set_timer (bm, bs, now, handling_wakeup);
+}
+
+void
+bfd_send_final (vlib_main_t * vm, vlib_buffer_t * b, bfd_session_t * bs)
+{
+ BFD_DBG ("Send final control frame for bs_idx=%lu", bs->bs_idx);
+ bfd_init_control_frame (b, bs);
+ bfd_pkt_set_final (vlib_buffer_get_current (b));
+ bfd_add_transport_layer (vm, b, bs);
+}
+
+static void
+bfd_check_rx_timeout (bfd_main_t * bm, bfd_session_t * bs, u64 now,
+ int handling_wakeup)
+{
+ /* sometimes the wheel expires an event a bit sooner than requested, account
+ for that here */
+ if (bs->last_rx_clocks + bs->detection_time_clocks <=
+ now + bm->wheel_inaccuracy)
+ {
+ BFD_DBG ("Rx timeout, session goes down");
+ bfd_set_diag (bs, BFD_DIAG_CODE_det_time_exp);
+ bfd_set_state (bm, bs, BFD_STATE_down, handling_wakeup);
+ }
+}
+
+void
+bfd_on_timeout (vlib_main_t * vm, vlib_node_runtime_t * rt, bfd_main_t * bm,
+ bfd_session_t * bs, u64 now)
+{
+ BFD_DBG ("Timeout for bs_idx=%lu", bs->bs_idx);
+ switch (bs->local_state)
+ {
+ case BFD_STATE_admin_down:
+ BFD_ERR ("Unexpected timeout when in %s state",
+ bfd_state_string (bs->local_state));
+ abort ();
+ break;
+ case BFD_STATE_down:
+ bfd_send_periodic (vm, rt, bm, bs, now, 1);
+ break;
+ case BFD_STATE_init:
+ BFD_ERR ("Unexpected timeout when in %s state",
+ bfd_state_string (bs->local_state));
+ abort ();
+ break;
+ case BFD_STATE_up:
+ bfd_check_rx_timeout (bm, bs, now, 1);
+ bfd_send_periodic (vm, rt, bm, bs, now, 1);
+ break;
+ }
+}
+
+/*
+ * bfd process node function
+ */
+static uword
+bfd_process (vlib_main_t * vm, vlib_node_runtime_t * rt, vlib_frame_t * f)
+{
+ bfd_main_t *bm = &bfd_main;
+ u32 *expired = 0;
+ uword event_type, *event_data = 0;
+
+ /* So we can send events to the bfd process */
+ bm->bfd_process_node_index = bfd_process_node.index;
+
+ while (1)
+ {
+ u64 now = clib_cpu_time_now ();
+ u64 next_expire = timing_wheel_next_expiring_elt_time (&bm->wheel);
+ BFD_DBG ("timing_wheel_next_expiring_elt_time(%p) returns %lu",
+ &bm->wheel, next_expire);
+ if ((i64) next_expire < 0)
+ {
+ BFD_DBG ("wait for event without timeout");
+ (void) vlib_process_wait_for_event (vm);
+ event_type = vlib_process_get_events (vm, &event_data);
+ }
+ else
+ {
+ f64 timeout = ((i64) next_expire - (i64) now) / bm->cpu_cps;
+ BFD_DBG ("wait for event with timeout %.02f", timeout);
+ if (timeout < 0)
+ {
+ BFD_DBG ("negative timeout, already expired, skipping wait");
+ event_type = ~0;
+ }
+ else
+ {
+ (void) vlib_process_wait_for_event_or_clock (vm, timeout);
+ event_type = vlib_process_get_events (vm, &event_data);
+ }
+ }
+ now = clib_cpu_time_now ();
+ switch (event_type)
+ {
+ case ~0: /* no events => timeout */
+ /* nothing to do here */
+ break;
+ case BFD_EVENT_RESCHEDULE:
+ /* nothing to do here - reschedule is done automatically after
+ * each event or timeout */
+ break;
+ case BFD_EVENT_NEW_SESSION:
+ do
+ {
+ bfd_session_t *bs =
+ pool_elt_at_index (bm->sessions, *event_data);
+ bfd_send_periodic (vm, rt, bm, bs, now, 1);
+ }
+ while (0);
+ break;
+ default:
+ clib_warning ("BUG: event type 0x%wx", event_type);
+ break;
+ }
+ BFD_DBG ("advancing wheel, now is %lu", now);
+ BFD_DBG ("timing_wheel_advance (%p, %lu, %p, 0);", &bm->wheel, now,
+ expired);
+ expired = timing_wheel_advance (&bm->wheel, now, expired, 0);
+ BFD_DBG ("Expired %d elements", vec_len (expired));
+ u32 *p = NULL;
+ vec_foreach (p, expired)
+ {
+ const u32 bs_idx = *p;
+ if (!pool_is_free_index (bm->sessions, bs_idx))
+ {
+ bfd_session_t *bs = pool_elt_at_index (bm->sessions, bs_idx);
+ bfd_on_timeout (vm, rt, bm, bs, now);
+ }
+ }
+ if (expired)
+ {
+ _vec_len (expired) = 0;
+ }
+ if (event_data)
+ {
+ _vec_len (event_data) = 0;
+ }
+ }
+
+ return 0;
+}
+
+/*
+ * bfd process node declaration
+ */
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (bfd_process_node, static) = {
+ .function = bfd_process,
+ .type = VLIB_NODE_TYPE_PROCESS,
+ .name = "bfd-process",
+ .n_next_nodes = BFD_OUTPUT_N_NEXT,
+ .next_nodes =
+ {
+#define F(t, n) [BFD_OUTPUT_##t] = n,
+ foreach_bfd_transport (F)
+#undef F
+ },
+};
+/* *INDENT-ON* */
+
+static clib_error_t *
+bfd_sw_interface_up_down (vnet_main_t * vnm, u32 sw_if_index, u32 flags)
+{
+ // bfd_main_t *bm = &bfd_main;
+ // vnet_hw_interface_t *hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
+ if (!(flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP))
+ {
+ /* TODO */
+ }
+ return 0;
+}
+
+VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION (bfd_sw_interface_up_down);
+
+static clib_error_t *
+bfd_hw_interface_up_down (vnet_main_t * vnm, u32 hw_if_index, u32 flags)
+{
+ // bfd_main_t *bm = &bfd_main;
+ if (flags & VNET_HW_INTERFACE_FLAG_LINK_UP)
+ {
+ /* TODO */
+ }
+ return 0;
+}
+
+VNET_HW_INTERFACE_LINK_UP_DOWN_FUNCTION (bfd_hw_interface_up_down);
+
+/*
+ * setup function
+ */
+static clib_error_t *
+bfd_main_init (vlib_main_t * vm)
+{
+ bfd_main_t *bm = &bfd_main;
+ bm->random_seed = random_default_seed ();
+ bm->vlib_main = vm;
+ bm->vnet_main = vnet_get_main ();
+ memset (&bm->wheel, 0, sizeof (bm->wheel));
+ bm->cpu_cps = 2590000000; // vm->clib_time.clocks_per_second;
+ BFD_DBG ("cps is %.2f", bm->cpu_cps);
+ const u64 now = clib_cpu_time_now ();
+ timing_wheel_init (&bm->wheel, now, bm->cpu_cps);
+ bm->wheel_inaccuracy = 2 << bm->wheel.log2_clocks_per_bin;
+
+ return 0;
+}
+
+VLIB_INIT_FUNCTION (bfd_main_init);
+
+bfd_session_t *
+bfd_get_session (bfd_main_t * bm, bfd_transport_t t)
+{
+ bfd_session_t *result;
+ pool_get (bm->sessions, result);
+ memset (result, 0, sizeof (*result));
+ result->bs_idx = result - bm->sessions;
+ result->transport = t;
+ result->local_discr = random_u32 (&bm->random_seed);
+ bfd_set_defaults (bm, result);
+ hash_set (bm->session_by_disc, result->local_discr, result->bs_idx);
+ return result;
+}
+
+void
+bfd_put_session (bfd_main_t * bm, bfd_session_t * bs)
+{
+ hash_unset (bm->session_by_disc, bs->local_discr);
+ pool_put (bm->sessions, bs);
+}
+
+bfd_session_t *
+bfd_find_session_by_idx (bfd_main_t * bm, uword bs_idx)
+{
+ if (!pool_is_free_index (bm->sessions, bs_idx))
+ {
+ return pool_elt_at_index (bm->sessions, bs_idx);
+ }
+ return NULL;
+}
+
+bfd_session_t *
+bfd_find_session_by_disc (bfd_main_t * bm, u32 disc)
+{
+ uword *p = hash_get (bfd_main.session_by_disc, disc);
+ if (p)
+ {
+ return pool_elt_at_index (bfd_main.sessions, *p);
+ }
+ return NULL;
+}
+
+/**
+ * @brief verify bfd packet - common checks
+ *
+ * @param pkt
+ *
+ * @return 1 if bfd packet is valid
+ */
+int
+bfd_verify_pkt_common (const bfd_pkt_t * pkt)
+{
+ if (1 != bfd_pkt_get_version (pkt))
+ {
+ BFD_ERR ("BFD verification failed - unexpected version: '%d'",
+ bfd_pkt_get_version (pkt));
+ return 0;
+ }
+ if (pkt->head.length < sizeof (bfd_pkt_t) ||
+ (bfd_pkt_get_auth_present (pkt) &&
+ pkt->head.length < sizeof (bfd_pkt_with_auth_t)))
+ {
+ BFD_ERR ("BFD verification failed - unexpected length: '%d' (auth "
+ "present: %d)",
+ pkt->head.length, bfd_pkt_get_auth_present (pkt));
+ return 0;
+ }
+ if (!pkt->head.detect_mult)
+ {
+ BFD_ERR ("BFD verification failed - unexpected detect-mult: '%d'",
+ pkt->head.detect_mult);
+ return 0;
+ }
+ if (bfd_pkt_get_multipoint (pkt))
+ {
+ BFD_ERR ("BFD verification failed - unexpected multipoint: '%d'",
+ bfd_pkt_get_multipoint (pkt));
+ return 0;
+ }
+ if (!pkt->my_disc)
+ {
+ BFD_ERR ("BFD verification failed - unexpected my-disc: '%d'",
+ pkt->my_disc);
+ return 0;
+ }
+ if (!pkt->your_disc)
+ {
+ const u8 pkt_state = bfd_pkt_get_state (pkt);
+ if (pkt_state != BFD_STATE_down && pkt_state != BFD_STATE_admin_down)
+ {
+ BFD_ERR ("BFD verification failed - unexpected state: '%s' "
+ "(your-disc is zero)", bfd_state_string (pkt_state));
+ return 0;
+ }
+ }
+ return 1;
+}
+
+/**
+ * @brief verify bfd packet - authentication
+ *
+ * @param pkt
+ *
+ * @return 1 if bfd packet is valid
+ */
+int
+bfd_verify_pkt_session (const bfd_pkt_t * pkt, u16 pkt_size,
+ const bfd_session_t * bs)
+{
+ const bfd_pkt_with_auth_t *with_auth = (bfd_pkt_with_auth_t *) pkt;
+ if (!bfd_pkt_get_auth_present (pkt))
+ {
+ if (pkt_size > sizeof (*pkt))
+ {
+ BFD_ERR ("BFD verification failed - unexpected packet size '%d' "
+ "(auth not present)", pkt_size);
+ return 0;
+ }
+ }
+ else
+ {
+ if (!with_auth->auth.type)
+ {
+ BFD_ERR ("BFD verification failed - unexpected auth type: '%d'",
+ with_auth->auth.type);
+ return 0;
+ }
+ /* TODO FIXME - implement the actual verification */
+ }
+ return 1;
+}
+
+void
+bfd_consume_pkt (bfd_main_t * bm, const bfd_pkt_t * pkt, u32 bs_idx)
+{
+ bfd_session_t *bs = bfd_find_session_by_idx (bm, bs_idx);
+ if (!bs)
+ {
+ return;
+ }
+ BFD_DBG ("Scanning bfd packet, bs_idx=%d", bs->bs_idx);
+ bs->remote_discr = pkt->my_disc;
+ bs->remote_state = bfd_pkt_get_state (pkt);
+ bs->remote_demand = bfd_pkt_get_demand (pkt);
+ u64 now = clib_cpu_time_now ();
+ bs->last_rx_clocks = now;
+ bs->remote_desired_min_tx_us = clib_net_to_host_u32 (pkt->des_min_tx);
+ bs->remote_detect_mult = pkt->head.detect_mult;
+ bfd_set_remote_required_min_rx (bm, bs, now,
+ clib_net_to_host_u32 (pkt->req_min_rx), 0);
+ /* FIXME
+ If the Required Min Echo RX Interval field is zero, the
+ transmission of Echo packets, if any, MUST cease.
+
+ If a Poll Sequence is being transmitted by the local system and
+ the Final (F) bit in the received packet is set, the Poll Sequence
+ MUST be terminated.
+ */
+ /* FIXME 6.8.2 */
+ /* FIXME 6.8.4 */
+ if (BFD_STATE_admin_down == bs->local_state)
+ return;
+ if (BFD_STATE_admin_down == bs->remote_state)
+ {
+ bfd_set_diag (bs, BFD_DIAG_CODE_neighbor_sig_down);
+ bfd_set_state (bm, bs, BFD_STATE_down, 0);
+ }
+ else if (BFD_STATE_down == bs->local_state)
+ {
+ if (BFD_STATE_down == bs->remote_state)
+ {
+ bfd_set_state (bm, bs, BFD_STATE_init, 0);
+ }
+ else if (BFD_STATE_init == bs->remote_state)
+ {
+ bfd_set_state (bm, bs, BFD_STATE_up, 0);
+ }
+ }
+ else if (BFD_STATE_init == bs->local_state)
+ {
+ if (BFD_STATE_up == bs->remote_state ||
+ BFD_STATE_init == bs->remote_state)
+ {
+ bfd_set_state (bm, bs, BFD_STATE_up, 0);
+ }
+ }
+ else /* BFD_STATE_up == bs->local_state */
+ {
+ if (BFD_STATE_down == bs->remote_state)
+ {
+ bfd_set_diag (bs, BFD_DIAG_CODE_neighbor_sig_down);
+ bfd_set_state (bm, bs, BFD_STATE_down, 0);
+ }
+ }
+}
+
+u8 *
+format_bfd_session (u8 * s, va_list * args)
+{
+ const bfd_session_t *bs = va_arg (*args, bfd_session_t *);
+ return format (s, "BFD(%u): bfd.SessionState=%s, "
+ "bfd.RemoteSessionState=%s, "
+ "bfd.LocalDiscr=%u, "
+ "bfd.RemoteDiscr=%u, "
+ "bfd.LocalDiag=%s, "
+ "bfd.DesiredMinTxInterval=%u, "
+ "bfd.RequiredMinRxInterval=%u, "
+ "bfd.RemoteMinRxInterval=%u, "
+ "bfd.DemandMode=%s, "
+ "bfd.RemoteDemandMode=%s, "
+ "bfd.DetectMult=%u, ",
+ bs->bs_idx, bfd_state_string (bs->local_state),
+ bfd_state_string (bs->remote_state), bs->local_discr,
+ bs->remote_discr, bfd_diag_code_string (bs->local_diag),
+ bs->desired_min_tx_us, bs->required_min_rx_us,
+ bs->remote_min_rx_us, (bs->local_demand ? "yes" : "no"),
+ (bs->remote_demand ? "yes" : "no"), bs->local_detect_mult);
+}
+
+bfd_main_t bfd_main;
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */