* @brief BFD nodes implementation
*/
+#if WITH_LIBSSL > 0
+#include <openssl/sha.h>
+#endif
+
+#if __SSE4_2__
+#include <x86intrin.h>
+#endif
+
+#include <vlibmemory/api.h>
#include <vppinfra/random.h>
#include <vppinfra/error.h>
#include <vppinfra/hash.h>
+#include <vppinfra/xxhash.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>
+#include <vlib/log.h>
+
+static u64
+bfd_calc_echo_checksum (u32 discriminator, u64 expire_time, u32 secret)
+{
+ u64 checksum = 0;
+#if defined(clib_crc32c_uses_intrinsics) && !defined (__i386__)
+ checksum = crc32_u64 (0, discriminator);
+ checksum = crc32_u64 (checksum, expire_time);
+ checksum = crc32_u64 (checksum, secret);
+#else
+ checksum = clib_xxhash (discriminator ^ expire_time ^ secret);
+#endif
+ return checksum;
+}
static u64
-bfd_us_to_clocks (bfd_main_t * bm, u64 us)
+bfd_usec_to_clocks (const bfd_main_t * bm, u64 us)
{
return bm->cpu_cps * ((f64) us / USEC_PER_SECOND);
}
+u32
+bfd_clocks_to_usec (const bfd_main_t * bm, u64 clocks)
+{
+ return ((f64) clocks / bm->cpu_cps) * USEC_PER_SECOND;
+}
+
static vlib_node_registration_t bfd_process_node;
-typedef enum
+u8 *
+format_bfd_auth_key (u8 * s, va_list * args)
{
-#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
-};
+ const bfd_auth_key_t *key = va_arg (*args, bfd_auth_key_t *);
+ if (key)
+ {
+ s = format (s, "{auth-type=%u:%s, conf-key-id=%u, use-count=%u}, ",
+ key->auth_type, bfd_auth_type_str (key->auth_type),
+ key->conf_key_id, key->use_count);
+ }
+ else
+ {
+ s = format (s, "{none}");
+ }
+ return s;
+}
/*
* We actually send all bfd pkts to the "error" node after scanning
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->hop_type = BFD_HOP_TYPE_SINGLE;
+ bs->config_desired_min_tx_usec = BFD_DEFAULT_DESIRED_MIN_TX_USEC;
+ bs->config_desired_min_tx_clocks = bm->default_desired_min_tx_clocks;
+ bs->effective_desired_min_tx_clocks = bm->default_desired_min_tx_clocks;
+ bs->remote_min_rx_usec = 1;
+ bs->remote_min_rx_clocks = bfd_usec_to_clocks (bm, bs->remote_min_rx_usec);
+ bs->remote_min_echo_rx_usec = 0;
+ bs->remote_min_echo_rx_clocks = 0;
bs->remote_demand = 0;
+ bs->auth.remote_seq_number = 0;
+ bs->auth.remote_seq_number_known = 0;
+ bs->auth.local_seq_number = random_u32 (&bm->random_seed);
+ bs->echo_secret = random_u32 (&bm->random_seed);
}
static void
}
}
-static void
-bfd_recalc_tx_interval (bfd_main_t * bm, bfd_session_t * bs)
+const char *
+bfd_poll_state_string (bfd_poll_state_e state)
{
- if (!bs->local_demand)
+ switch (state)
{
- bs->transmit_interval_clocks =
- clib_max (bs->desired_min_tx_clocks, bs->remote_min_rx_clocks);
+#define F(x) \
+ case BFD_POLL_##x: \
+ return "BFD_POLL_" #x;
+ foreach_bfd_poll_state (F)
+#undef F
}
- else
+ return "UNKNOWN";
+}
+
+static void
+bfd_set_poll_state (bfd_session_t * bs, bfd_poll_state_e state)
+{
+ if (bs->poll_state != state)
{
- /* TODO */
+ BFD_DBG ("Setting poll state=%s, bs_idx=%u",
+ bfd_poll_state_string (state), bs->bs_idx);
+ bs->poll_state = state;
}
- BFD_DBG ("Recalculated transmit interval %lu clocks/%.2fs",
- bs->transmit_interval_clocks,
- bs->transmit_interval_clocks / bm->cpu_cps);
+}
+
+static void
+bfd_recalc_tx_interval (bfd_main_t * bm, bfd_session_t * bs)
+{
+ bs->transmit_interval_clocks =
+ clib_max (bs->effective_desired_min_tx_clocks, bs->remote_min_rx_clocks);
+ BFD_DBG ("Recalculated transmit interval " BFD_CLK_FMT,
+ BFD_CLK_PRN (bs->transmit_interval_clocks));
+}
+
+static void
+bfd_recalc_echo_tx_interval (bfd_main_t * bm, bfd_session_t * bs)
+{
+ bs->echo_transmit_interval_clocks =
+ clib_max (bs->effective_desired_min_tx_clocks,
+ bs->remote_min_echo_rx_clocks);
+ BFD_DBG ("Recalculated echo transmit interval " BFD_CLK_FMT,
+ BFD_CLK_PRN (bs->echo_transmit_interval_clocks));
}
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)
{
- if (bs->local_detect_mult > 1)
- {
- /* common case - 75-100% of transmit interval */
- bs->tx_timeout_clocks = bs->last_tx_clocks +
- (1 - .25 * (random_f64 (&bm->random_seed))) *
- bs->transmit_interval_clocks;
- if (bs->tx_timeout_clocks < now)
- {
- /* huh, we've missed it already, transmit now */
- BFD_DBG ("Missed %lu transmit events (now is %lu, calc "
- "tx_timeout is %lu)",
- (now - bs->tx_timeout_clocks) /
- bs->transmit_interval_clocks,
- now, bs->tx_timeout_clocks);
- bs->tx_timeout_clocks = now;
- }
- }
- else
+ /* common case - 75-100% of transmit interval */
+ bs->tx_timeout_clocks = bs->last_tx_clocks +
+ (1 - .25 * (random_f64 (&bm->random_seed))) *
+ bs->transmit_interval_clocks;
+ if (bs->tx_timeout_clocks < now)
{
- /* special case - 75-90% of transmit interval */
- bs->tx_timeout_clocks =
- bs->last_tx_clocks +
- (.9 - .15 * (random_f64 (&bm->random_seed))) *
- bs->transmit_interval_clocks;
- if (bs->tx_timeout_clocks < now)
- {
- /* huh, we've missed it already, transmit now */
- BFD_DBG ("Missed %lu transmit events (now is %lu, calc "
- "tx_timeout is %lu)",
- (now - bs->tx_timeout_clocks) /
- bs->transmit_interval_clocks,
- now, bs->tx_timeout_clocks);
- bs->tx_timeout_clocks = now;
- }
+ /*
+ * the timeout is in the past, which means that either remote
+ * demand mode was set or performance/clock issues ...
+ */
+ BFD_DBG ("Missed %lu transmit events (now is %lu, calc "
+ "tx_timeout is %lu)",
+ (now - bs->tx_timeout_clocks) /
+ bs->transmit_interval_clocks, now, bs->tx_timeout_clocks);
+ bs->tx_timeout_clocks = now;
}
}
else
{
- /* TODO */
+ /* special case - 75-90% of transmit interval */
+ bs->tx_timeout_clocks = bs->last_tx_clocks +
+ (.9 - .15 * (random_f64 (&bm->random_seed))) *
+ bs->transmit_interval_clocks;
+ if (bs->tx_timeout_clocks < now)
+ {
+ /*
+ * the timeout is in the past, which means that either remote
+ * demand mode was set or performance/clock issues ...
+ */
+ BFD_DBG ("Missed %lu transmit events (now is %lu, calc "
+ "tx_timeout is %lu)",
+ (now - bs->tx_timeout_clocks) /
+ bs->transmit_interval_clocks, now, bs->tx_timeout_clocks);
+ bs->tx_timeout_clocks = now;
+ }
}
if (bs->tx_timeout_clocks)
{
}
static void
-bfd_recalc_detection_time (bfd_main_t * bm, bfd_session_t * bs)
+bfd_calc_next_echo_tx (bfd_main_t * bm, bfd_session_t * bs, u64 now)
{
- if (!bs->local_demand)
+ bs->echo_tx_timeout_clocks =
+ bs->echo_last_tx_clocks + bs->echo_transmit_interval_clocks;
+ if (bs->echo_tx_timeout_clocks < now)
{
- 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));
+ /* huh, we've missed it already, transmit now */
+ BFD_DBG ("Missed %lu echo transmit events (now is %lu, calc tx_timeout "
+ "is %lu)",
+ (now - bs->echo_tx_timeout_clocks) /
+ bs->echo_transmit_interval_clocks,
+ now, bs->echo_tx_timeout_clocks);
+ bs->echo_tx_timeout_clocks = now;
}
- else
+ BFD_DBG ("Next echo transmit in %lu clocks/%.02fs@%lu",
+ bs->echo_tx_timeout_clocks - now,
+ (bs->echo_tx_timeout_clocks - now) / bm->cpu_cps,
+ bs->echo_tx_timeout_clocks);
+}
+
+static void
+bfd_recalc_detection_time (bfd_main_t * bm, bfd_session_t * bs)
+{
+ if (bs->local_state == BFD_STATE_init || bs->local_state == BFD_STATE_up)
{
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));
+ bs->remote_detect_mult *
+ clib_max (bs->effective_required_min_rx_clocks,
+ bs->remote_desired_min_tx_clocks);
+ BFD_DBG ("Recalculated detection time %lu clocks/%.2fs",
+ bs->detection_time_clocks,
+ bs->detection_time_clocks / bm->cpu_cps);
}
- BFD_DBG ("Recalculated detection time %lu clocks/%.2fs",
- bs->detection_time_clocks,
- bs->detection_time_clocks / bm->cpu_cps);
}
static void
{
u64 next = 0;
u64 rx_timeout = 0;
+ u64 tx_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)
+ if (BFD_STATE_up != bs->local_state ||
+ (!bs->remote_demand && bs->remote_min_rx_usec) ||
+ BFD_POLL_NOT_NEEDED != bs->poll_state)
+ {
+ tx_timeout = bs->tx_timeout_clocks;
+ }
+ if (tx_timeout && rx_timeout)
{
- next = clib_min (bs->tx_timeout_clocks, rx_timeout);
+ next = clib_min (tx_timeout, rx_timeout);
}
- else if (bs->tx_timeout_clocks)
+ else if (tx_timeout)
{
- next = bs->tx_timeout_clocks;
+ next = tx_timeout;
}
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");
+ if (bs->echo && next > bs->echo_tx_timeout_clocks)
+ {
+ next = bs->echo_tx_timeout_clocks;
+ }
+ BFD_DBG ("bs_idx=%u, tx_timeout=%lu, echo_tx_timeout=%lu, rx_timeout=%lu, "
+ "next=%s",
+ bs->bs_idx, tx_timeout, bs->echo_tx_timeout_clocks, rx_timeout,
+ next == tx_timeout
+ ? "tx" : (next == bs->echo_tx_timeout_clocks ? "echo 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))
{
+ int send_signal = 0;
bs->wheel_time_clocks = next;
BFD_DBG ("timing_wheel_insert(%p, %lu (%ld clocks/%.2fs in the "
"future), %u);",
(i64) bs->wheel_time_clocks - clib_cpu_time_now (),
(i64) (bs->wheel_time_clocks - clib_cpu_time_now ()) /
bm->cpu_cps, bs->bs_idx);
+ bfd_lock (bm);
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);
+
+ /* Send only if it is earlier than current awaited wakeup time */
+ send_signal =
+ (bs->wheel_time_clocks < bm->bfd_process_next_wakeup_clocks) &&
+ /*
+ * If the wake-up time is within 2x the delay of the event propagation delay,
+ * avoid the expense of sending the event. The 2x multiplier is to workaround the race whereby
+ * simultaneous event + expired timer create one recurring bogus wakeup/suspend instance,
+ * due to double scheduling of the node on the pending list.
+ */
+ (bm->bfd_process_next_wakeup_clocks - bs->wheel_time_clocks >
+ 2 * bm->bfd_process_wakeup_event_delay_clocks) &&
+ /* Must be no events in flight to send an event */
+ (!bm->bfd_process_wakeup_events_in_flight);
+
+ /* If we do send the signal, note this down along with the start timestamp */
+ if (send_signal)
+ {
+ bm->bfd_process_wakeup_events_in_flight++;
+ bm->bfd_process_wakeup_event_start_clocks = now;
+ }
+ }
+ bfd_unlock (bm);
+
+ /* Use the multithreaded event sending so the workers can send events too */
+ if (send_signal)
+ {
+ vlib_process_signal_event_mt (bm->vlib_main,
+ bm->bfd_process_node_index,
+ BFD_EVENT_RESCHEDULE, ~0);
}
}
}
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_set_effective_desired_min_tx (bfd_main_t * bm,
+ bfd_session_t * bs, u64 now,
+ u64 desired_min_tx_clocks)
+{
+ bs->effective_desired_min_tx_clocks = desired_min_tx_clocks;
+ BFD_DBG ("Set effective desired min tx to " BFD_CLK_FMT,
+ BFD_CLK_PRN (bs->effective_desired_min_tx_clocks));
bfd_recalc_detection_time (bm, bs);
bfd_recalc_tx_interval (bm, bs);
+ bfd_recalc_echo_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_set_effective_required_min_rx (bfd_main_t * bm,
+ bfd_session_t * bs,
+ u64 required_min_rx_clocks)
+{
+ bs->effective_required_min_rx_clocks = required_min_rx_clocks;
+ BFD_DBG ("Set effective required min rx to " BFD_CLK_FMT,
+ BFD_CLK_PRN (bs->effective_required_min_rx_clocks));
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)
+static void
+bfd_set_remote_required_min_rx (bfd_main_t * bm, bfd_session_t * bs,
+ u64 now, u32 remote_required_min_rx_usec)
{
- 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);
+ if (bs->remote_min_rx_usec != remote_required_min_rx_usec)
+ {
+ bs->remote_min_rx_usec = remote_required_min_rx_usec;
+ bs->remote_min_rx_clocks =
+ bfd_usec_to_clocks (bm, remote_required_min_rx_usec);
+ BFD_DBG ("Set remote min rx to " BFD_CLK_FMT,
+ BFD_CLK_PRN (bs->remote_min_rx_clocks));
+ bfd_recalc_detection_time (bm, bs);
+ bfd_recalc_tx_interval (bm, bs);
+ }
}
-vnet_api_error_t
-bfd_del_session (uword bs_idx)
+static void
+bfd_set_remote_required_min_echo_rx (bfd_main_t * bm, bfd_session_t * bs,
+ u64 now,
+ u32 remote_required_min_echo_rx_usec)
{
- 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
+ if (bs->remote_min_echo_rx_usec != remote_required_min_echo_rx_usec)
{
- BFD_ERR ("no such session");
- return VNET_API_ERROR_BFD_NOENT;
+ bs->remote_min_echo_rx_usec = remote_required_min_echo_rx_usec;
+ bs->remote_min_echo_rx_clocks =
+ bfd_usec_to_clocks (bm, bs->remote_min_echo_rx_usec);
+ BFD_DBG ("Set remote min echo rx to " BFD_CLK_FMT,
+ BFD_CLK_PRN (bs->remote_min_echo_rx_clocks));
+ bfd_recalc_echo_tx_interval (bm, bs);
}
- return 0;
}
-const char *
-bfd_diag_code_string (bfd_diag_code_e diag)
+static void
+bfd_notify_listeners (bfd_main_t * bm,
+ bfd_listen_event_e event, const bfd_session_t * bs)
{
-#define F(n, t, s) \
- case BFD_DIAG_CODE_NAME (t): \
- return s;
- switch (diag)
- {
- foreach_bfd_diag_code (F)}
- return "UNKNOWN";
-#undef F
+ bfd_notify_fn_t *fn;
+ vec_foreach (fn, bm->listeners)
+ {
+ (*fn) (event, bs);
+ }
}
-const char *
-bfd_state_string (bfd_state_e state)
+void
+bfd_session_start (bfd_main_t * bm, bfd_session_t * bs)
{
-#define F(n, t, s) \
- case BFD_STATE_NAME (t): \
- return s;
- switch (state)
- {
- foreach_bfd_state (F)}
- return "UNKNOWN";
-#undef F
+ BFD_DBG ("\nStarting session: %U", format_bfd_session, bs);
+ vlib_log_info (bm->log_class, "start BFD session: %U",
+ format_bfd_session_brief, bs);
+ bfd_set_effective_required_min_rx (bm, bs,
+ bs->config_required_min_rx_clocks);
+ 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);
+ bfd_notify_listeners (bm, BFD_LISTEN_EVENT_CREATE, bs);
}
-vnet_api_error_t
-bfd_session_set_flags (u32 bs_idx, u8 admin_up_down)
+void
+bfd_session_set_flags (bfd_session_t * bs, 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);
+ u64 now = clib_cpu_time_now ();
if (admin_up_down)
{
+ BFD_DBG ("Session set admin-up, bs-idx=%u", bs->bs_idx);
+ vlib_log_info (bm->log_class, "set session admin-up: %U",
+ format_bfd_session_brief, bs);
bfd_set_state (bm, bs, BFD_STATE_down, 0);
+ bfd_set_diag (bs, BFD_DIAG_CODE_no_diag);
+ bfd_calc_next_tx (bm, bs, now);
+ bfd_set_timer (bm, bs, now, 0);
}
else
{
- bfd_set_diag (bs, BFD_DIAG_CODE_neighbor_sig_down);
+ BFD_DBG ("Session set admin-down, bs-idx=%u", bs->bs_idx);
+ vlib_log_info (bm->log_class, "set session admin-down: %U",
+ format_bfd_session_brief, bs);
+ bfd_set_diag (bs, BFD_DIAG_CODE_admin_down);
bfd_set_state (bm, bs, BFD_STATE_admin_down, 0);
+ bfd_calc_next_tx (bm, bs, now);
+ bfd_set_timer (bm, bs, now, 0);
}
- return 0;
}
u8 *
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",
+ " 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_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))
+ 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, " my discriminator: %u\n",
+ clib_net_to_host_u32 (pkt->my_disc));
+ s = format (s, " your discriminator: %u\n",
+ clib_net_to_host_u32 (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",
+ s = format (s, " required min echo rx interval: %u",
clib_net_to_host_u32 (pkt->req_min_echo_rx));
}
+ if (t->len >= sizeof (bfd_pkt_with_common_auth_t) &&
+ pkt->head.length >= sizeof (bfd_pkt_with_common_auth_t) &&
+ bfd_pkt_get_auth_present (pkt))
+ {
+ const bfd_pkt_with_common_auth_t *with_auth = (void *) pkt;
+ const bfd_auth_common_t *common = &with_auth->common_auth;
+ s = format (s, "\n auth len: %u\n", common->len);
+ s = format (s, " auth type: %u:%s\n", common->type,
+ bfd_auth_type_str (common->type));
+ if (t->len >= sizeof (bfd_pkt_with_sha1_auth_t) &&
+ pkt->head.length >= sizeof (bfd_pkt_with_sha1_auth_t) &&
+ (BFD_AUTH_TYPE_keyed_sha1 == common->type ||
+ BFD_AUTH_TYPE_meticulous_keyed_sha1 == common->type))
+ {
+ const bfd_pkt_with_sha1_auth_t *with_sha1 = (void *) pkt;
+ const bfd_auth_sha1_t *sha1 = &with_sha1->sha1_auth;
+ s = format (s, " seq num: %u\n",
+ clib_net_to_host_u32 (sha1->seq_num));
+ s = format (s, " key id: %u\n", sha1->key_id);
+ s = format (s, " hash: %U", format_hex_bytes, sha1->hash,
+ sizeof (sha1->hash));
+ }
+ }
+ else
+ {
+ s = format (s, "\n");
+ }
}
return s;
}
+typedef struct
+{
+ u32 bs_idx;
+} bfd_rpc_event_t;
+
+static void
+bfd_rpc_event_cb (const bfd_rpc_event_t * a)
+{
+ bfd_main_t *bm = &bfd_main;
+ u32 bs_idx = a->bs_idx;
+ u32 valid_bs = 0;
+ bfd_session_t session_data;
+
+ bfd_lock (bm);
+ if (!pool_is_free_index (bm->sessions, bs_idx))
+ {
+ bfd_session_t *bs = pool_elt_at_index (bm->sessions, bs_idx);
+ clib_memcpy (&session_data, bs, sizeof (bfd_session_t));
+ valid_bs = 1;
+ }
+ else
+ {
+ BFD_DBG ("Ignoring event RPC for non-existent session index %u",
+ bs_idx);
+ }
+ bfd_unlock (bm);
+
+ if (valid_bs)
+ bfd_event (bm, &session_data);
+}
+
+static void
+bfd_event_rpc (u32 bs_idx)
+{
+ const u32 data_size = sizeof (bfd_rpc_event_t);
+ u8 data[data_size];
+ bfd_rpc_event_t *event = (bfd_rpc_event_t *) data;
+
+ event->bs_idx = bs_idx;
+ vl_api_rpc_call_main_thread (bfd_rpc_event_cb, data, data_size);
+}
+
+typedef struct
+{
+ u32 bs_idx;
+} bfd_rpc_notify_listeners_t;
+
+static void
+bfd_rpc_notify_listeners_cb (const bfd_rpc_notify_listeners_t * a)
+{
+ bfd_main_t *bm = &bfd_main;
+ u32 bs_idx = a->bs_idx;
+ bfd_lock (bm);
+ if (!pool_is_free_index (bm->sessions, bs_idx))
+ {
+ bfd_session_t *bs = pool_elt_at_index (bm->sessions, bs_idx);
+ bfd_notify_listeners (bm, BFD_LISTEN_EVENT_UPDATE, bs);
+ }
+ else
+ {
+ BFD_DBG ("Ignoring notify RPC for non-existent session index %u",
+ bs_idx);
+ }
+ bfd_unlock (bm);
+}
+
+static void
+bfd_notify_listeners_rpc (u32 bs_idx)
+{
+ const u32 data_size = sizeof (bfd_rpc_notify_listeners_t);
+ u8 data[data_size];
+ bfd_rpc_notify_listeners_t *notify = (bfd_rpc_notify_listeners_t *) data;
+ notify->bs_idx = bs_idx;
+ vl_api_rpc_call_main_thread (bfd_rpc_notify_listeners_cb, data, data_size);
+}
+
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);
+ BFD_DBG ("\nState changed: %U", format_bfd_session, bs);
+
+ if (vlib_get_thread_index () == 0)
+ {
+ bfd_event (bm, bs);
+ }
+ else
+ {
+ /* without RPC - a REGRESSION: BFD event are not propagated */
+ bfd_event_rpc (bs->bs_idx);
+ }
+
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);
+ bs->echo = 0;
+ bfd_set_effective_desired_min_tx (bm, bs, now,
+ clib_max
+ (bs->config_desired_min_tx_clocks,
+ bm->default_desired_min_tx_clocks));
+ bfd_set_effective_required_min_rx (bm, bs,
+ bs->config_required_min_rx_clocks);
+ bfd_set_timer (bm, bs, now, 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);
+ bs->echo = 0;
+ bfd_set_effective_desired_min_tx (bm, bs, now,
+ clib_max
+ (bs->config_desired_min_tx_clocks,
+ bm->default_desired_min_tx_clocks));
+ bfd_set_effective_required_min_rx (bm, bs,
+ bs->config_required_min_rx_clocks);
+ bfd_set_timer (bm, bs, now, 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);
+ bs->echo = 0;
+ bfd_set_effective_desired_min_tx (bm, bs, now,
+ bs->config_desired_min_tx_clocks);
+ bfd_set_timer (bm, bs, now, handling_wakeup);
break;
case BFD_STATE_up:
- bfd_set_desired_min_tx (bm, bs, now, bs->config_desired_min_tx_us,
- handling_wakeup);
+ bfd_set_effective_desired_min_tx (bm, bs, now,
+ bs->config_desired_min_tx_clocks);
+ if (BFD_POLL_NOT_NEEDED == bs->poll_state)
+ {
+ bfd_set_effective_required_min_rx (bm, bs,
+ bs->config_required_min_rx_clocks);
+ }
+ bfd_set_timer (bm, bs, now, handling_wakeup);
break;
}
+ if (vlib_get_thread_index () == 0)
+ {
+ bfd_notify_listeners (bm, BFD_LISTEN_EVENT_UPDATE, bs);
+ }
+ else
+ {
+ /* without RPC - a REGRESSION: state changes are not propagated */
+ bfd_notify_listeners_rpc (bs->bs_idx);
+ }
+}
+
+static void
+bfd_on_config_change (vlib_main_t * vm, vlib_node_runtime_t * rt,
+ bfd_main_t * bm, bfd_session_t * bs, u64 now)
+{
+ /*
+ * if remote demand mode is set and we need to do a poll, set the next
+ * timeout so that the session wakes up immediately
+ */
+ if (bs->remote_demand && BFD_POLL_NEEDED == bs->poll_state &&
+ bs->poll_state_start_or_timeout_clocks < now)
+ {
+ bs->tx_timeout_clocks = now;
+ }
+ bfd_recalc_detection_time (bm, bs);
+ bfd_set_timer (bm, bs, now, 0);
}
static void
-bfd_add_transport_layer (vlib_main_t * vm, vlib_buffer_t * b,
- bfd_session_t * bs)
+bfd_add_transport_layer (vlib_main_t * vm, u32 bi, bfd_session_t * bs)
{
switch (bs->transport)
{
case BFD_TRANSPORT_UDP4:
- /* fallthrough */
+ BFD_DBG ("Transport bfd via udp4, bs_idx=%u", bs->bs_idx);
+ bfd_add_udp4_transport (vm, bi, bs, 0 /* is_echo */ );
+ break;
case BFD_TRANSPORT_UDP6:
- BFD_DBG ("Transport bfd via udp, bs_idx=%u", bs->bs_idx);
- bfd_add_udp_transport (vm, b, &bs->udp);
+ BFD_DBG ("Transport bfd via udp6, bs_idx=%u", bs->bs_idx);
+ bfd_add_udp6_transport (vm, bi, bs, 0 /* is_echo */ );
break;
}
}
-static vlib_buffer_t *
-bfd_create_frame (vlib_main_t * vm, vlib_node_runtime_t * rt,
- bfd_session_t * bs)
+static int
+bfd_transport_control_frame (vlib_main_t * vm, u32 bi, bfd_session_t * bs)
{
- u32 bi;
- if (vlib_buffer_alloc (vm, &bi, 1) != 1)
+ switch (bs->transport)
{
- clib_warning ("buffer allocation failure");
- return NULL;
+ case BFD_TRANSPORT_UDP4:
+ BFD_DBG ("Transport bfd via udp4, bs_idx=%u", bs->bs_idx);
+ return bfd_transport_udp4 (vm, bi, bs);
+ break;
+ case BFD_TRANSPORT_UDP6:
+ BFD_DBG ("Transport bfd via udp6, bs_idx=%u", bs->bs_idx);
+ return bfd_transport_udp6 (vm, bi, bs);
+ break;
}
+ return 0;
+}
- vlib_buffer_t *b = vlib_get_buffer (vm, bi);
- ASSERT (b->current_data == 0);
+static int
+bfd_echo_add_transport_layer (vlib_main_t * vm, u32 bi, bfd_session_t * bs)
+{
+ switch (bs->transport)
+ {
+ case BFD_TRANSPORT_UDP4:
+ BFD_DBG ("Transport bfd echo via udp4, bs_idx=%u", bs->bs_idx);
+ return bfd_add_udp4_transport (vm, bi, bs, 1 /* is_echo */ );
+ break;
+ case BFD_TRANSPORT_UDP6:
+ BFD_DBG ("Transport bfd echo via udp6, bs_idx=%u", bs->bs_idx);
+ return bfd_add_udp6_transport (vm, bi, bs, 1 /* is_echo */ );
+ break;
+ }
+ return 0;
+}
- u32 *to_next;
- u32 n_left_to_next;
+static int
+bfd_transport_echo (vlib_main_t * vm, u32 bi, bfd_session_t * bs)
+{
+ switch (bs->transport)
+ {
+ case BFD_TRANSPORT_UDP4:
+ BFD_DBG ("Transport bfd echo via udp4, bs_idx=%u", bs->bs_idx);
+ return bfd_transport_udp4 (vm, bi, bs);
+ break;
+ case BFD_TRANSPORT_UDP6:
+ BFD_DBG ("Transport bfd echo via udp6, bs_idx=%u", bs->bs_idx);
+ return bfd_transport_udp6 (vm, bi, bs);
+ break;
+ }
+ return 0;
+}
- vlib_get_next_frame (vm, rt, bfd_next_index_by_transport[bs->transport],
- to_next, n_left_to_next);
+#if WITH_LIBSSL > 0
+static void
+bfd_add_sha1_auth_section (vlib_buffer_t * b, bfd_session_t * bs)
+{
+ bfd_pkt_with_sha1_auth_t *pkt = vlib_buffer_get_current (b);
+ bfd_auth_sha1_t *auth = &pkt->sha1_auth;
+ b->current_length += sizeof (*auth);
+ pkt->pkt.head.length += sizeof (*auth);
+ bfd_pkt_set_auth_present (&pkt->pkt);
+ clib_memset (auth, 0, sizeof (*auth));
+ auth->type_len.type = bs->auth.curr_key->auth_type;
+ /*
+ * only meticulous authentication types require incrementing seq number
+ * for every message, but doing so doesn't violate the RFC
+ */
+ ++bs->auth.local_seq_number;
+ auth->type_len.len = sizeof (bfd_auth_sha1_t);
+ auth->key_id = bs->auth.curr_bfd_key_id;
+ auth->seq_num = clib_host_to_net_u32 (bs->auth.local_seq_number);
+ /*
+ * first copy the password into the packet, then calculate the hash
+ * and finally replace the password with the calculated hash
+ */
+ clib_memcpy (auth->hash, bs->auth.curr_key->key,
+ sizeof (bs->auth.curr_key->key));
+ unsigned char hash[sizeof (auth->hash)];
+ SHA1 ((unsigned char *) pkt, sizeof (*pkt), hash);
+ BFD_DBG ("hashing: %U", format_hex_bytes, pkt, sizeof (*pkt));
+ clib_memcpy (auth->hash, hash, sizeof (hash));
+}
+#endif
- to_next[0] = bi;
- n_left_to_next -= 1;
+static void
+bfd_add_auth_section (vlib_buffer_t * b, bfd_session_t * bs)
+{
+ bfd_main_t *bm = &bfd_main;
+ if (bs->auth.curr_key)
+ {
+ const bfd_auth_type_e auth_type = bs->auth.curr_key->auth_type;
+ switch (auth_type)
+ {
+ case BFD_AUTH_TYPE_reserved:
+ /* fallthrough */
+ case BFD_AUTH_TYPE_simple_password:
+ /* fallthrough */
+ case BFD_AUTH_TYPE_keyed_md5:
+ /* fallthrough */
+ case BFD_AUTH_TYPE_meticulous_keyed_md5:
+ vlib_log_crit (bm->log_class,
+ "internal error, unexpected BFD auth type '%d'",
+ auth_type);
+ break;
+#if WITH_LIBSSL > 0
+ case BFD_AUTH_TYPE_keyed_sha1:
+ /* fallthrough */
+ case BFD_AUTH_TYPE_meticulous_keyed_sha1:
+ bfd_add_sha1_auth_section (b, bs);
+ break;
+#else
+ case BFD_AUTH_TYPE_keyed_sha1:
+ /* fallthrough */
+ case BFD_AUTH_TYPE_meticulous_keyed_sha1:
+ vlib_log_crit (bm->log_class,
+ "internal error, unexpected BFD auth type '%d'",
+ auth_type);
+ break;
+#endif
+ }
+ }
+}
- vlib_put_next_frame (vm, rt, bfd_next_index_by_transport[bs->transport],
- n_left_to_next);
- return b;
+static int
+bfd_is_echo_possible (bfd_session_t * bs)
+{
+ if (BFD_STATE_up == bs->local_state && BFD_STATE_up == bs->remote_state &&
+ bs->remote_min_echo_rx_usec > 0)
+ {
+ switch (bs->transport)
+ {
+ case BFD_TRANSPORT_UDP4:
+ return bfd_udp_is_echo_available (BFD_TRANSPORT_UDP4);
+ case BFD_TRANSPORT_UDP6:
+ return bfd_udp_is_echo_available (BFD_TRANSPORT_UDP6);
+ }
+ }
+ return 0;
}
static void
-bfd_init_control_frame (vlib_buffer_t * b, bfd_session_t * bs)
+bfd_init_control_frame (bfd_main_t * bm, bfd_session_t * bs,
+ vlib_buffer_t * b)
{
bfd_pkt_t *pkt = vlib_buffer_get_current (b);
- const u32 bfd_length = 24;
- memset (pkt, 0, sizeof (*pkt));
-
+ u32 bfd_length = 0;
+ bfd_length = sizeof (bfd_pkt_t);
+ clib_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->head.length = 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 (bs->required_min_echo_rx_us);
+ pkt->des_min_tx = clib_host_to_net_u32 (bs->config_desired_min_tx_usec);
+ if (bs->echo)
+ {
+ pkt->req_min_rx =
+ clib_host_to_net_u32 (bfd_clocks_to_usec
+ (bm, bs->effective_required_min_rx_clocks));
+ }
+ else
+ {
+ pkt->req_min_rx =
+ clib_host_to_net_u32 (bs->config_required_min_rx_usec);
+ }
+ pkt->req_min_echo_rx = clib_host_to_net_u32 (1);
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)
+bfd_send_echo (vlib_main_t * vm, vlib_node_runtime_t * rt,
+ bfd_main_t * bm, bfd_session_t * bs, u64 now)
{
- if (!bs->remote_min_rx_us)
+ if (!bfd_is_echo_possible (bs))
{
- BFD_DBG
- ("bfd.RemoteMinRxInterval is zero, not sending periodic control "
- "frame");
+ BFD_DBG ("\nSwitching off echo function: %U", format_bfd_session, bs);
+ bs->echo = 0;
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
+ /* sometimes the wheel expires an event a bit sooner than requested,
+ account
for that here */
- if (now + bm->wheel_inaccuracy >= bs->tx_timeout_clocks)
+ if (now + bm->wheel_inaccuracy >= bs->echo_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)
+ BFD_DBG ("\nSending echo packet: %U", format_bfd_session, bs);
+ u32 bi;
+ if (vlib_buffer_alloc (vm, &bi, 1) != 1)
{
+ vlib_log_crit (bm->log_class, "buffer allocation failure");
return;
}
- bfd_init_control_frame (b, bs);
- bfd_add_transport_layer (vm, b, bs);
- bs->last_tx_clocks = now;
- bfd_calc_next_tx (bm, bs, now);
+ vlib_buffer_t *b = vlib_get_buffer (vm, bi);
+ ASSERT (b->current_data == 0);
+ VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b);
+ bfd_echo_pkt_t *pkt = vlib_buffer_get_current (b);
+ clib_memset (pkt, 0, sizeof (*pkt));
+ pkt->discriminator = bs->local_discr;
+ pkt->expire_time_clocks =
+ now + bs->echo_transmit_interval_clocks * bs->local_detect_mult;
+ pkt->checksum =
+ bfd_calc_echo_checksum (bs->local_discr, pkt->expire_time_clocks,
+ bs->echo_secret);
+ b->current_length = sizeof (*pkt);
+ if (!bfd_echo_add_transport_layer (vm, bi, bs))
+ {
+ BFD_ERR ("cannot send echo packet out, turning echo off");
+ bs->echo = 0;
+ vlib_buffer_free_one (vm, bi);
+ return;
+ }
+ if (!bfd_transport_echo (vm, bi, bs))
+ {
+ BFD_ERR ("cannot send echo packet out, turning echo off");
+ bs->echo = 0;
+ vlib_buffer_free_one (vm, bi);
+ return;
+ }
+ bs->echo_last_tx_clocks = now;
+ bfd_calc_next_echo_tx (bm, bs, now);
+ }
+ else
+ {
+ BFD_DBG
+ ("No need to send echo packet now, now is %lu, tx_timeout is %lu",
+ now, bs->echo_tx_timeout_clocks);
+ }
+}
+
+static void
+bfd_send_periodic (vlib_main_t * vm, vlib_node_runtime_t * rt,
+ bfd_main_t * bm, bfd_session_t * bs, u64 now)
+{
+ if (!bs->remote_min_rx_usec && BFD_POLL_NOT_NEEDED == bs->poll_state)
+ {
+ BFD_DBG ("Remote min rx interval is zero, not sending periodic control "
+ "frame");
+ return;
+ }
+ if (BFD_POLL_NOT_NEEDED == bs->poll_state && bs->remote_demand &&
+ BFD_STATE_up == bs->local_state && BFD_STATE_up == bs->remote_state)
+ {
+ /*
+ * 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.
+ */
+ BFD_DBG ("Remote demand is set, not sending periodic control frame");
+ return;
+ }
+ /*
+ * 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 ("\nSending periodic control frame: %U", format_bfd_session,
+ bs);
+ u32 bi;
+ if (vlib_buffer_alloc (vm, &bi, 1) != 1)
+ {
+ vlib_log_crit (bm->log_class, "buffer allocation failure");
+ return;
+ }
+ vlib_buffer_t *b = vlib_get_buffer (vm, bi);
+ ASSERT (b->current_data == 0);
+ VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b);
+ bfd_init_control_frame (bm, bs, b);
+ switch (bs->poll_state)
+ {
+ case BFD_POLL_NEEDED:
+ if (now < bs->poll_state_start_or_timeout_clocks)
+ {
+ BFD_DBG ("Cannot start a poll sequence yet, need to wait "
+ "for " BFD_CLK_FMT,
+ BFD_CLK_PRN (bs->poll_state_start_or_timeout_clocks -
+ now));
+ break;
+ }
+ bs->poll_state_start_or_timeout_clocks = now;
+ bfd_set_poll_state (bs, BFD_POLL_IN_PROGRESS);
+ /* fallthrough */
+ case BFD_POLL_IN_PROGRESS:
+ case BFD_POLL_IN_PROGRESS_AND_QUEUED:
+ bfd_pkt_set_poll (vlib_buffer_get_current (b));
+ BFD_DBG ("Setting poll bit in packet, bs_idx=%u", bs->bs_idx);
+ break;
+ case BFD_POLL_NOT_NEEDED:
+ /* fallthrough */
+ break;
+ }
+ bfd_add_auth_section (b, bs);
+ bfd_add_transport_layer (vm, bi, bs);
+ if (!bfd_transport_control_frame (vm, bi, bs))
+ {
+ vlib_buffer_free_one (vm, bi);
+ }
+ bs->last_tx_clocks = now;
+ bfd_calc_next_tx (bm, bs, now);
}
else
{
("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_init_final_control_frame (vlib_main_t * vm, vlib_buffer_t * b,
+ bfd_main_t * bm, bfd_session_t * bs,
+ int is_local)
{
BFD_DBG ("Send final control frame for bs_idx=%lu", bs->bs_idx);
- bfd_init_control_frame (b, bs);
+ bfd_init_control_frame (bm, bs, b);
bfd_pkt_set_final (vlib_buffer_get_current (b));
- bfd_add_transport_layer (vm, b, bs);
+ bfd_add_auth_section (b, bs);
+ u32 bi = vlib_get_buffer_index (vm, b);
+ bfd_add_transport_layer (vm, bi, bs);
bs->last_tx_clocks = clib_cpu_time_now ();
+ /*
+ * RFC allows to include changes in final frame, so if there were any
+ * pending, we already did that, thus we can clear any pending poll needs
+ */
+ bfd_set_poll_state (bs, BFD_POLL_NOT_NEEDED);
}
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 */
+ /*
+ * 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");
+ /*
+ * RFC 5880 6.8.1. State Variables
+
+ * bfd.RemoteDiscr
+
+ * The remote discriminator for this BFD session. This is the
+ * discriminator chosen by the remote system, and is totally opaque
+ * to the local system. This MUST be initialized to zero. If a
+ * period of a Detection Time passes without the receipt of a valid,
+ * authenticated BFD packet from the remote system, this variable
+ * MUST be set to zero.
+ */
+ bs->remote_discr = 0;
bfd_set_diag (bs, BFD_DIAG_CODE_det_time_exp);
bfd_set_state (bm, bs, BFD_STATE_down, handling_wakeup);
+ /*
+ * If the remote system does not receive any
+ * BFD Control packets for a Detection Time, it SHOULD reset
+ * bfd.RemoteMinRxInterval to its initial value of 1 (per section 6.8.1,
+ * since it is no longer required to maintain previous session state)
+ * and then can transmit at its own rate.
+ */
+ bfd_set_remote_required_min_rx (bm, bs, now, 1);
+ }
+ else if (bs->echo &&
+ bs->echo_last_rx_clocks +
+ bs->echo_transmit_interval_clocks * bs->local_detect_mult <=
+ now + bm->wheel_inaccuracy)
+ {
+ BFD_DBG ("Echo rx timeout, session goes down");
+ bfd_set_diag (bs, BFD_DIAG_CODE_echo_failed);
+ bfd_set_state (bm, bs, BFD_STATE_down, handling_wakeup);
}
}
switch (bs->local_state)
{
case BFD_STATE_admin_down:
- BFD_ERR ("Unexpected timeout when in %s state",
- bfd_state_string (bs->local_state));
- abort ();
+ bfd_send_periodic (vm, rt, bm, bs, now);
break;
case BFD_STATE_down:
- bfd_send_periodic (vm, rt, bm, bs, now, 1);
+ bfd_send_periodic (vm, rt, bm, bs, now);
break;
case BFD_STATE_init:
- BFD_ERR ("Unexpected timeout when in %s state",
- bfd_state_string (bs->local_state));
- abort ();
+ bfd_check_rx_timeout (bm, bs, now, 1);
+ bfd_send_periodic (vm, rt, bm, bs, now);
break;
case BFD_STATE_up:
bfd_check_rx_timeout (bm, bs, now, 1);
- bfd_send_periodic (vm, rt, bm, bs, now, 1);
+ if (BFD_POLL_NOT_NEEDED == bs->poll_state && !bs->echo &&
+ bfd_is_echo_possible (bs))
+ {
+ /* switch on echo function as main detection method now */
+ BFD_DBG ("Switching on echo function, bs_idx=%u", bs->bs_idx);
+ bs->echo = 1;
+ bs->echo_last_rx_clocks = now;
+ bs->echo_tx_timeout_clocks = now;
+ bfd_set_effective_required_min_rx (bm, bs,
+ clib_max
+ (bm->min_required_min_rx_while_echo_clocks,
+ bs->config_required_min_rx_clocks));
+ bfd_set_poll_state (bs, BFD_POLL_NEEDED);
+ }
+ bfd_send_periodic (vm, rt, bm, bs, now);
+ if (bs->echo)
+ {
+ bfd_send_echo (vm, rt, bm, bs, now);
+ }
break;
}
}
while (1)
{
u64 now = clib_cpu_time_now ();
+ bfd_lock (bm);
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);
+ bm->bfd_process_next_wakeup_clocks =
+ (i64) next_expire >= 0 ? next_expire : ~0;
+ bfd_unlock (bm);
if ((i64) next_expire < 0)
{
BFD_DBG ("wait for event without timeout");
}
}
now = clib_cpu_time_now ();
+ uword *session_index;
switch (event_type)
{
case ~0: /* no events => timeout */
/* nothing to do here */
break;
case BFD_EVENT_RESCHEDULE:
+ bfd_lock (bm);
+ bm->bfd_process_wakeup_event_delay_clocks =
+ now - bm->bfd_process_wakeup_event_start_clocks;
+ bm->bfd_process_wakeup_events_in_flight--;
+ bfd_unlock (bm);
/* 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);
+ vec_foreach (session_index, event_data)
+ {
+ bfd_lock (bm);
+ if (!pool_is_free_index (bm->sessions, *session_index))
+ {
+ bfd_session_t *bs =
+ pool_elt_at_index (bm->sessions, *session_index);
+ bfd_send_periodic (vm, rt, bm, bs, now);
+ bfd_set_timer (bm, bs, now, 1);
+ }
+ else
+ {
+ BFD_DBG ("Ignoring event for non-existent session index %u",
+ (u32) * session_index);
+ }
+ bfd_unlock (bm);
+ }
+ break;
+ case BFD_EVENT_CONFIG_CHANGED:
+ vec_foreach (session_index, event_data)
+ {
+ bfd_lock (bm);
+ if (!pool_is_free_index (bm->sessions, *session_index))
+ {
+ bfd_session_t *bs =
+ pool_elt_at_index (bm->sessions, *session_index);
+ bfd_on_config_change (vm, rt, bm, bs, now);
+ }
+ else
+ {
+ BFD_DBG ("Ignoring event for non-existent session index %u",
+ (u32) * session_index);
+ }
+ bfd_unlock (bm);
+ }
break;
default:
- clib_warning ("BUG: event type 0x%wx", event_type);
+ vlib_log_err (bm->log_class, "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);
+ bfd_lock (bm);
expired = timing_wheel_advance (&bm->wheel, now, expired, 0);
BFD_DBG ("Expired %d elements", vec_len (expired));
u32 *p = NULL;
{
bfd_session_t *bs = pool_elt_at_index (bm->sessions, bs_idx);
bfd_on_timeout (vm, rt, bm, bs, now);
+ bfd_set_timer (bm, bs, now, 1);
}
}
+ bfd_unlock (bm);
if (expired)
{
_vec_len (expired) = 0;
.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
- },
+ .n_next_nodes = 0,
+ .next_nodes = {},
};
/* *INDENT-ON* */
VNET_HW_INTERFACE_LINK_UP_DOWN_FUNCTION (bfd_hw_interface_up_down);
+void
+bfd_register_listener (bfd_notify_fn_t fn)
+{
+ bfd_main_t *bm = &bfd_main;
+
+ vec_add1 (bm->listeners, fn);
+}
+
/*
* setup function
*/
static clib_error_t *
bfd_main_init (vlib_main_t * vm)
{
+ vlib_thread_main_t *tm = &vlib_thread_main;
+ u32 n_vlib_mains = tm->n_vlib_mains;
+#if BFD_DEBUG
+ setbuf (stdout, NULL);
+#endif
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;
+ clib_memset (&bm->wheel, 0, sizeof (bm->wheel));
+ bm->cpu_cps = (u64) vm->clib_time.clocks_per_second;
BFD_DBG ("cps is %.2f", bm->cpu_cps);
+ bm->default_desired_min_tx_clocks =
+ bfd_usec_to_clocks (bm, BFD_DEFAULT_DESIRED_MIN_TX_USEC);
+ bm->min_required_min_rx_while_echo_clocks =
+ bfd_usec_to_clocks (bm, BFD_REQUIRED_MIN_RX_USEC_WHILE_ECHO);
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;
-
+ bm->log_class = vlib_log_register_class ("bfd", 0);
+ vlib_log_debug (bm->log_class, "initialized");
+ bm->owner_thread_index = ~0;
+ if (n_vlib_mains > 1)
+ clib_spinlock_init (&bm->lock);
return 0;
}
VLIB_INIT_FUNCTION (bfd_main_init);
bfd_session_t *
-bfd_get_session (bfd_main_t * bm, bfd_transport_t t)
+bfd_get_session (bfd_main_t * bm, bfd_transport_e t)
{
bfd_session_t *result;
+
+ bfd_lock (bm);
+
pool_get (bm->sessions, result);
- memset (result, 0, sizeof (*result));
+ clib_memset (result, 0, sizeof (*result));
result->bs_idx = result - bm->sessions;
result->transport = t;
- result->local_discr = random_u32 (&bm->random_seed);
+ const unsigned limit = 1000;
+ unsigned counter = 0;
+ do
+ {
+ result->local_discr = random_u32 (&bm->random_seed);
+ if (counter > limit)
+ {
+ vlib_log_crit (bm->log_class,
+ "couldn't allocate unused session discriminator even "
+ "after %u tries!", limit);
+ pool_put (bm->sessions, result);
+ bfd_unlock (bm);
+ return NULL;
+ }
+ ++counter;
+ }
+ while (hash_get (bm->session_by_disc, result->local_discr));
bfd_set_defaults (bm, result);
hash_set (bm->session_by_disc, result->local_discr, result->bs_idx);
+ bfd_unlock (bm);
return result;
}
void
bfd_put_session (bfd_main_t * bm, bfd_session_t * bs)
{
+ bfd_lock (bm);
+
+ vlib_log_info (bm->log_class, "delete session: %U",
+ format_bfd_session_brief, bs);
+ bfd_notify_listeners (bm, BFD_LISTEN_EVENT_DELETE, bs);
+ if (bs->auth.curr_key)
+ {
+ --bs->auth.curr_key->use_count;
+ }
+ if (bs->auth.next_key)
+ {
+ --bs->auth.next_key->use_count;
+ }
hash_unset (bm->session_by_disc, bs->local_discr);
pool_put (bm->sessions, bs);
+ bfd_unlock (bm);
}
bfd_session_t *
bfd_find_session_by_idx (bfd_main_t * bm, uword bs_idx)
{
+ bfd_lock_check (bm);
if (!pool_is_free_index (bm->sessions, bs_idx))
{
return pool_elt_at_index (bm->sessions, bs_idx);
bfd_session_t *
bfd_find_session_by_disc (bfd_main_t * bm, u32 disc)
{
+ bfd_lock_check (bm);
uword *p = hash_get (bfd_main.session_by_disc, disc);
if (p)
{
}
if (pkt->head.length < sizeof (bfd_pkt_t) ||
(bfd_pkt_get_auth_present (pkt) &&
- pkt->head.length < sizeof (bfd_pkt_with_auth_t)))
+ pkt->head.length < sizeof (bfd_pkt_with_common_auth_t)))
{
BFD_ERR ("BFD verification failed - unexpected length: '%d' (auth "
"present: %d)",
return 1;
}
+static void
+bfd_session_switch_auth_to_next (bfd_session_t * bs)
+{
+ BFD_DBG ("Switching authentication key from %U to %U for bs_idx=%u",
+ format_bfd_auth_key, bs->auth.curr_key, format_bfd_auth_key,
+ bs->auth.next_key, bs->bs_idx);
+ bs->auth.is_delayed = 0;
+ if (bs->auth.curr_key)
+ {
+ --bs->auth.curr_key->use_count;
+ }
+ bs->auth.curr_key = bs->auth.next_key;
+ bs->auth.next_key = NULL;
+ bs->auth.curr_bfd_key_id = bs->auth.next_bfd_key_id;
+}
+
+static int
+bfd_auth_type_is_meticulous (bfd_auth_type_e auth_type)
+{
+ if (BFD_AUTH_TYPE_meticulous_keyed_md5 == auth_type ||
+ BFD_AUTH_TYPE_meticulous_keyed_sha1 == auth_type)
+ {
+ return 1;
+ }
+ return 0;
+}
+
+static int
+bfd_verify_pkt_auth_seq_num (bfd_session_t * bs,
+ u32 received_seq_num, int is_meticulous)
+{
+ /*
+ * RFC 5880 6.8.1:
+ *
+ * This variable MUST be set to zero after no packets have been
+ * received on this session for at least twice the Detection Time.
+ */
+ u64 now = clib_cpu_time_now ();
+ if (now - bs->last_rx_clocks > bs->detection_time_clocks * 2)
+ {
+ BFD_DBG ("BFD peer unresponsive for %lu clocks, which is > 2 * "
+ "detection_time=%u clocks, resetting remote_seq_number_known "
+ "flag",
+ now - bs->last_rx_clocks, bs->detection_time_clocks * 2);
+ bs->auth.remote_seq_number_known = 0;
+ }
+ if (bs->auth.remote_seq_number_known)
+ {
+ /* remote sequence number is known, verify its validity */
+ const u32 max_u32 = 0xffffffff;
+ /* the calculation might wrap, account for the special case... */
+ if (bs->auth.remote_seq_number > max_u32 - 3 * bs->local_detect_mult)
+ {
+ /*
+ * special case
+ *
+ * x y z
+ * |----------+----------------------------+-----------|
+ * 0 ^ ^ 0xffffffff
+ * | remote_seq_num------+
+ * |
+ * +-----(remote_seq_num + 3*detect_mult) % * 0xffffffff
+ *
+ * x + y + z = 0xffffffff
+ * x + z = 3 * detect_mult
+ */
+ const u32 z = max_u32 - bs->auth.remote_seq_number;
+ const u32 x = 3 * bs->local_detect_mult - z;
+ if (received_seq_num > x &&
+ received_seq_num < bs->auth.remote_seq_number + is_meticulous)
+ {
+ BFD_ERR
+ ("Recvd sequence number=%u out of ranges <0, %u>, <%u, %u>",
+ received_seq_num, x,
+ bs->auth.remote_seq_number + is_meticulous, max_u32);
+ return 0;
+ }
+ }
+ else
+ {
+ /* regular case */
+ const u32 min = bs->auth.remote_seq_number + is_meticulous;
+ const u32 max =
+ bs->auth.remote_seq_number + 3 * bs->local_detect_mult;
+ if (received_seq_num < min || received_seq_num > max)
+ {
+ BFD_ERR ("Recvd sequence number=%u out of range <%u, %u>",
+ received_seq_num, min, max);
+ return 0;
+ }
+ }
+ }
+ return 1;
+}
+
+static int
+bfd_verify_pkt_auth_key_sha1 (const bfd_pkt_t * pkt, u32 pkt_size,
+ bfd_session_t * bs, u8 bfd_key_id,
+ bfd_auth_key_t * auth_key)
+{
+ ASSERT (auth_key->auth_type == BFD_AUTH_TYPE_keyed_sha1 ||
+ auth_key->auth_type == BFD_AUTH_TYPE_meticulous_keyed_sha1);
+
+ u8 result[SHA_DIGEST_LENGTH];
+ bfd_pkt_with_common_auth_t *with_common = (void *) pkt;
+ if (pkt_size < sizeof (*with_common))
+ {
+ BFD_ERR ("Packet size too small to hold authentication common header");
+ return 0;
+ }
+ if (with_common->common_auth.type != auth_key->auth_type)
+ {
+ BFD_ERR ("BFD auth type mismatch, packet auth=%d:%s doesn't match "
+ "in-use auth=%d:%s",
+ with_common->common_auth.type,
+ bfd_auth_type_str (with_common->common_auth.type),
+ auth_key->auth_type, bfd_auth_type_str (auth_key->auth_type));
+ return 0;
+ }
+ bfd_pkt_with_sha1_auth_t *with_sha1 = (void *) pkt;
+ if (pkt_size < sizeof (*with_sha1) ||
+ with_sha1->sha1_auth.type_len.len < sizeof (with_sha1->sha1_auth))
+ {
+ BFD_ERR
+ ("BFD size mismatch, payload size=%u, expected=%u, auth_len=%u, "
+ "expected=%u", pkt_size, sizeof (*with_sha1),
+ with_sha1->sha1_auth.type_len.len, sizeof (with_sha1->sha1_auth));
+ return 0;
+ }
+ if (with_sha1->sha1_auth.key_id != bfd_key_id)
+ {
+ BFD_ERR
+ ("BFD key ID mismatch, packet key ID=%u doesn't match key ID=%u%s",
+ with_sha1->sha1_auth.key_id, bfd_key_id,
+ bs->
+ auth.is_delayed ? " (but a delayed auth change is scheduled)" : "");
+ return 0;
+ }
+ SHA_CTX ctx;
+ if (!SHA1_Init (&ctx))
+ {
+ BFD_ERR ("SHA1_Init failed");
+ return 0;
+ }
+ /* ignore last 20 bytes - use the actual key data instead pkt data */
+ if (!SHA1_Update (&ctx, with_sha1,
+ sizeof (*with_sha1) - sizeof (with_sha1->sha1_auth.hash)))
+ {
+ BFD_ERR ("SHA1_Update failed");
+ return 0;
+ }
+ if (!SHA1_Update (&ctx, auth_key->key, sizeof (auth_key->key)))
+ {
+ BFD_ERR ("SHA1_Update failed");
+ return 0;
+ }
+ if (!SHA1_Final (result, &ctx))
+ {
+ BFD_ERR ("SHA1_Final failed");
+ return 0;
+ }
+ if (0 == memcmp (result, with_sha1->sha1_auth.hash, SHA_DIGEST_LENGTH))
+ {
+ return 1;
+ }
+ BFD_ERR ("SHA1 hash: %U doesn't match the expected value: %U",
+ format_hex_bytes, with_sha1->sha1_auth.hash, SHA_DIGEST_LENGTH,
+ format_hex_bytes, result, SHA_DIGEST_LENGTH);
+ return 0;
+}
+
+static int
+bfd_verify_pkt_auth_key (const bfd_pkt_t * pkt, u32 pkt_size,
+ bfd_session_t * bs, u8 bfd_key_id,
+ bfd_auth_key_t * auth_key)
+{
+ bfd_main_t *bm = &bfd_main;
+ switch (auth_key->auth_type)
+ {
+ case BFD_AUTH_TYPE_reserved:
+ vlib_log_err (bm->log_class,
+ "internal error, unexpected auth_type=%d:%s",
+ auth_key->auth_type,
+ bfd_auth_type_str (auth_key->auth_type));
+ return 0;
+ case BFD_AUTH_TYPE_simple_password:
+ vlib_log_err (bm->log_class,
+ "internal error, not implemented, unexpected auth_type=%d:%s",
+ auth_key->auth_type,
+ bfd_auth_type_str (auth_key->auth_type));
+ return 0;
+ case BFD_AUTH_TYPE_keyed_md5:
+ /* fallthrough */
+ case BFD_AUTH_TYPE_meticulous_keyed_md5:
+ vlib_log_err
+ (bm->log_class,
+ "internal error, not implemented, unexpected auth_type=%d:%s",
+ auth_key->auth_type, bfd_auth_type_str (auth_key->auth_type));
+ return 0;
+ case BFD_AUTH_TYPE_keyed_sha1:
+ /* fallthrough */
+ case BFD_AUTH_TYPE_meticulous_keyed_sha1:
+#if WITH_LIBSSL > 0
+ do
+ {
+ const u32 seq_num = clib_net_to_host_u32 (((bfd_pkt_with_sha1_auth_t
+ *) pkt)->
+ sha1_auth.seq_num);
+ return bfd_verify_pkt_auth_seq_num (bs, seq_num,
+ bfd_auth_type_is_meticulous
+ (auth_key->auth_type))
+ && bfd_verify_pkt_auth_key_sha1 (pkt, pkt_size, bs, bfd_key_id,
+ auth_key);
+ }
+ while (0);
+#else
+ vlib_log_err
+ (bm->log_class,
+ "internal error, attempt to use SHA1 without SSL support");
+ return 0;
+#endif
+ }
+ return 0;
+}
+
/**
* @brief verify bfd packet - authentication
*
* @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)
+bfd_verify_pkt_auth (const bfd_pkt_t * pkt, u16 pkt_size, 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 (bfd_pkt_get_auth_present (pkt))
{
- if (pkt_size > sizeof (*pkt))
+ /* authentication present in packet */
+ if (!bs->auth.curr_key)
{
- BFD_ERR ("BFD verification failed - unexpected packet size '%d' "
- "(auth not present)", pkt_size);
- return 0;
+ /* currently not using authentication - can we turn it on? */
+ if (bs->auth.is_delayed && bs->auth.next_key)
+ {
+ /* yes, switch is scheduled - make sure the auth is valid */
+ if (bfd_verify_pkt_auth_key (pkt, pkt_size, bs,
+ bs->auth.next_bfd_key_id,
+ bs->auth.next_key))
+ {
+ /* auth matches next key, do the switch, packet is valid */
+ bfd_session_switch_auth_to_next (bs);
+ return 1;
+ }
+ }
+ }
+ else
+ {
+ /* yes, using authentication, verify the key */
+ if (bfd_verify_pkt_auth_key (pkt, pkt_size, bs,
+ bs->auth.curr_bfd_key_id,
+ bs->auth.curr_key))
+ {
+ /* verification passed, packet is valid */
+ return 1;
+ }
+ else
+ {
+ /* verification failed - but maybe we need to switch key */
+ if (bs->auth.is_delayed && bs->auth.next_key)
+ {
+ /* delayed switch present, verify if that key works */
+ if (bfd_verify_pkt_auth_key (pkt, pkt_size, bs,
+ bs->auth.next_bfd_key_id,
+ bs->auth.next_key))
+ {
+ /* auth matches next key, switch key, packet is valid */
+ bfd_session_switch_auth_to_next (bs);
+ return 1;
+ }
+ }
+ }
}
}
else
{
- if (!with_auth->auth.type)
+ /* authentication in packet not present */
+ if (pkt_size > sizeof (*pkt))
{
- BFD_ERR ("BFD verification failed - unexpected auth type: '%d'",
- with_auth->auth.type);
+ BFD_ERR ("BFD verification failed - unexpected packet size '%d' "
+ "(auth not present)", pkt_size);
return 0;
}
- /* TODO FIXME - implement the actual verification */
+ if (bs->auth.curr_key)
+ {
+ /* currently authenticating - could we turn it off? */
+ if (bs->auth.is_delayed && !bs->auth.next_key)
+ {
+ /* yes, delayed switch to NULL key is scheduled */
+ bfd_session_switch_auth_to_next (bs);
+ return 1;
+ }
+ }
+ else
+ {
+ /* no auth in packet, no auth in use - packet is valid */
+ return 1;
+ }
}
- return 1;
+ return 0;
}
void
bfd_consume_pkt (bfd_main_t * bm, const bfd_pkt_t * pkt, u32 bs_idx)
{
+ bfd_lock_check (bm);
+
bfd_session_t *bs = bfd_find_session_by_idx (bm, bs_idx);
- if (!bs)
+ if (!bs || (pkt->your_disc && pkt->your_disc != bs->local_discr))
{
return;
}
bs->remote_discr = pkt->my_disc;
bs->remote_state = bfd_pkt_get_state (pkt);
bs->remote_demand = bfd_pkt_get_demand (pkt);
+ bs->remote_diag = bfd_pkt_get_diag_code (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);
+ if (bfd_pkt_get_auth_present (pkt))
+ {
+ bfd_auth_type_e auth_type =
+ ((bfd_pkt_with_common_auth_t *) (pkt))->common_auth.type;
+ switch (auth_type)
+ {
+ case BFD_AUTH_TYPE_reserved:
+ /* fallthrough */
+ case BFD_AUTH_TYPE_simple_password:
+ /* fallthrough */
+ case BFD_AUTH_TYPE_keyed_md5:
+ /* fallthrough */
+ case BFD_AUTH_TYPE_meticulous_keyed_md5:
+ vlib_log_crit (bm->log_class,
+ "internal error, unexpected auth_type=%d:%s",
+ auth_type, bfd_auth_type_str (auth_type));
+ break;
+ case BFD_AUTH_TYPE_keyed_sha1:
+ /* fallthrough */
+ case BFD_AUTH_TYPE_meticulous_keyed_sha1:
+ do
+ {
+ bfd_pkt_with_sha1_auth_t *with_sha1 =
+ (bfd_pkt_with_sha1_auth_t *) pkt;
+ bs->auth.remote_seq_number =
+ clib_net_to_host_u32 (with_sha1->sha1_auth.seq_num);
+ bs->auth.remote_seq_number_known = 1;
+ BFD_DBG ("Received sequence number %u",
+ bs->auth.remote_seq_number);
+ }
+ while (0);
+ }
+ }
+ bs->remote_desired_min_tx_clocks =
+ bfd_usec_to_clocks (bm, 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 */
+ clib_net_to_host_u32 (pkt->req_min_rx));
+ bfd_set_remote_required_min_echo_rx (bm, bs, now,
+ clib_net_to_host_u32
+ (pkt->req_min_echo_rx));
+ if (bfd_pkt_get_final (pkt))
+ {
+ if (BFD_POLL_IN_PROGRESS == bs->poll_state)
+ {
+ BFD_DBG ("Poll sequence terminated, bs_idx=%u", bs->bs_idx);
+ bfd_set_poll_state (bs, BFD_POLL_NOT_NEEDED);
+ if (BFD_STATE_up == bs->local_state)
+ {
+ bfd_set_effective_required_min_rx (bm, bs,
+ clib_max (bs->echo *
+ bm->min_required_min_rx_while_echo_clocks,
+ bs->config_required_min_rx_clocks));
+ }
+ }
+ else if (BFD_POLL_IN_PROGRESS_AND_QUEUED == bs->poll_state)
+ {
+ /*
+ * next poll sequence must be delayed by at least the round trip
+ * time, so calculate that here
+ */
+ BFD_DBG ("Next poll sequence can commence in " BFD_CLK_FMT,
+ BFD_CLK_PRN (now -
+ bs->poll_state_start_or_timeout_clocks));
+ bs->poll_state_start_or_timeout_clocks =
+ now + (now - bs->poll_state_start_or_timeout_clocks);
+ BFD_DBG
+ ("Poll sequence terminated, but another is needed, bs_idx=%u",
+ bs->bs_idx);
+ bfd_set_poll_state (bs, BFD_POLL_NEEDED);
+ }
+ }
+ bfd_calc_next_tx (bm, bs, now);
+ bfd_set_timer (bm, bs, now, 0);
if (BFD_STATE_admin_down == bs->local_state)
- return;
+ {
+ BFD_DBG ("Session is admin-down, ignoring packet, bs_idx=%u",
+ bs->bs_idx);
+ return;
+ }
if (BFD_STATE_admin_down == bs->remote_state)
{
bfd_set_diag (bs, BFD_DIAG_CODE_neighbor_sig_down);
{
if (BFD_STATE_down == bs->remote_state)
{
+ bfd_set_diag (bs, BFD_DIAG_CODE_no_diag);
bfd_set_state (bm, bs, BFD_STATE_init, 0);
}
else if (BFD_STATE_init == bs->remote_state)
{
+ bfd_set_diag (bs, BFD_DIAG_CODE_no_diag);
bfd_set_state (bm, bs, BFD_STATE_up, 0);
}
}
if (BFD_STATE_up == bs->remote_state ||
BFD_STATE_init == bs->remote_state)
{
+ bfd_set_diag (bs, BFD_DIAG_CODE_no_diag);
bfd_set_state (bm, bs, BFD_STATE_up, 0);
}
}
}
}
+int
+bfd_consume_echo_pkt (bfd_main_t * bm, vlib_buffer_t * b)
+{
+ bfd_echo_pkt_t *pkt = NULL;
+ if (b->current_length != sizeof (*pkt))
+ {
+ return 0;
+ }
+ pkt = vlib_buffer_get_current (b);
+ bfd_session_t *bs = bfd_find_session_by_disc (bm, pkt->discriminator);
+ if (!bs)
+ {
+ return 0;
+ }
+ BFD_DBG ("Scanning bfd echo packet, bs_idx=%d", bs->bs_idx);
+ u64 checksum =
+ bfd_calc_echo_checksum (bs->local_discr, pkt->expire_time_clocks,
+ bs->echo_secret);
+ if (checksum != pkt->checksum)
+ {
+ BFD_DBG ("Invalid echo packet, checksum mismatch");
+ return 1;
+ }
+ u64 now = clib_cpu_time_now ();
+ if (pkt->expire_time_clocks < now)
+ {
+ BFD_DBG ("Stale packet received, expire time %lu < now %lu",
+ pkt->expire_time_clocks, now);
+ }
+ else
+ {
+ bs->echo_last_rx_clocks = now;
+ }
+ return 1;
+}
+
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.RequiredMinEchoRxInterval=%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->required_min_echo_rx_us, bs->remote_min_rx_us,
- (bs->local_demand ? "yes" : "no"),
- (bs->remote_demand ? "yes" : "no"), bs->local_detect_mult);
+ u32 indent = format_get_indent (s) + vlib_log_get_indent ();
+ s = format (s, "bs_idx=%u local-state=%s remote-state=%s\n"
+ "%Ulocal-discriminator=%u remote-discriminator=%u\n"
+ "%Ulocal-diag=%s echo-active=%s\n"
+ "%Udesired-min-tx=%u required-min-rx=%u\n"
+ "%Urequired-min-echo-rx=%u detect-mult=%u\n"
+ "%Uremote-min-rx=%u remote-min-echo-rx=%u\n"
+ "%Uremote-demand=%s poll-state=%s\n"
+ "%Uauth: local-seq-num=%u remote-seq-num=%u\n"
+ "%U is-delayed=%s\n"
+ "%U curr-key=%U\n"
+ "%U next-key=%U",
+ bs->bs_idx, bfd_state_string (bs->local_state),
+ bfd_state_string (bs->remote_state), format_white_space, indent,
+ bs->local_discr, bs->remote_discr, format_white_space, indent,
+ bfd_diag_code_string (bs->local_diag),
+ (bs->echo ? "yes" : "no"), format_white_space, indent,
+ bs->config_desired_min_tx_usec, bs->config_required_min_rx_usec,
+ format_white_space, indent, 1, bs->local_detect_mult,
+ format_white_space, indent, bs->remote_min_rx_usec,
+ bs->remote_min_echo_rx_usec, format_white_space, indent,
+ (bs->remote_demand ? "yes" : "no"),
+ bfd_poll_state_string (bs->poll_state), format_white_space,
+ indent, bs->auth.local_seq_number, bs->auth.remote_seq_number,
+ format_white_space, indent,
+ (bs->auth.is_delayed ? "yes" : "no"), format_white_space,
+ indent, format_bfd_auth_key, bs->auth.curr_key,
+ format_white_space, indent, format_bfd_auth_key,
+ bs->auth.next_key);
+ return s;
+}
+
+u8 *
+format_bfd_session_brief (u8 * s, va_list * args)
+{
+ const bfd_session_t *bs = va_arg (*args, bfd_session_t *);
+ s =
+ format (s, "bs_idx=%u local-state=%s remote-state=%s", bs->bs_idx,
+ bfd_state_string (bs->local_state),
+ bfd_state_string (bs->remote_state));
+ return s;
+}
+
+unsigned
+bfd_auth_type_supported (bfd_auth_type_e auth_type)
+{
+ if (auth_type == BFD_AUTH_TYPE_keyed_sha1 ||
+ auth_type == BFD_AUTH_TYPE_meticulous_keyed_sha1)
+ {
+ return 1;
+ }
+ return 0;
+}
+
+vnet_api_error_t
+bfd_auth_activate (bfd_session_t * bs, u32 conf_key_id,
+ u8 bfd_key_id, u8 is_delayed)
+{
+ bfd_main_t *bm = &bfd_main;
+ const uword *key_idx_p =
+ hash_get (bm->auth_key_by_conf_key_id, conf_key_id);
+ if (!key_idx_p)
+ {
+ vlib_log_err (bm->log_class,
+ "authentication key with config ID %u doesn't exist)",
+ conf_key_id);
+ return VNET_API_ERROR_BFD_ENOENT;
+ }
+ const uword key_idx = *key_idx_p;
+ bfd_auth_key_t *key = pool_elt_at_index (bm->auth_keys, key_idx);
+ if (is_delayed)
+ {
+ if (bs->auth.next_key == key)
+ {
+ /* already using this key, no changes required */
+ return 0;
+ }
+ bs->auth.next_key = key;
+ bs->auth.next_bfd_key_id = bfd_key_id;
+ bs->auth.is_delayed = 1;
+ }
+ else
+ {
+ if (bs->auth.curr_key == key)
+ {
+ /* already using this key, no changes required */
+ return 0;
+ }
+ if (bs->auth.curr_key)
+ {
+ --bs->auth.curr_key->use_count;
+ }
+ bs->auth.curr_key = key;
+ bs->auth.curr_bfd_key_id = bfd_key_id;
+ bs->auth.is_delayed = 0;
+ }
+ ++key->use_count;
+ BFD_DBG ("\nSession auth modified: %U", format_bfd_session, bs);
+ vlib_log_info (bm->log_class, "session auth modified: %U",
+ format_bfd_session_brief, bs);
+ return 0;
+}
+
+vnet_api_error_t
+bfd_auth_deactivate (bfd_session_t * bs, u8 is_delayed)
+{
+ bfd_main_t *bm = &bfd_main;
+#if WITH_LIBSSL > 0
+ if (!is_delayed)
+ {
+ /* not delayed - deactivate the current key right now */
+ if (bs->auth.curr_key)
+ {
+ --bs->auth.curr_key->use_count;
+ bs->auth.curr_key = NULL;
+ }
+ bs->auth.is_delayed = 0;
+ }
+ else
+ {
+ /* delayed - mark as so */
+ bs->auth.is_delayed = 1;
+ }
+ /*
+ * clear the next key unconditionally - either the auth change is not delayed
+ * in which case the caller expects the session to not use authentication
+ * from this point forward, or it is delayed, in which case the next_key
+ * needs to be set to NULL to make it so in the future
+ */
+ if (bs->auth.next_key)
+ {
+ --bs->auth.next_key->use_count;
+ bs->auth.next_key = NULL;
+ }
+ BFD_DBG ("\nSession auth modified: %U", format_bfd_session, bs);
+ vlib_log_info (bm->log_class, "session auth modified: %U",
+ format_bfd_session_brief, bs);
+ return 0;
+#else
+ vlib_log_err (bm->log_class,
+ "SSL missing, cannot deactivate BFD authentication");
+ return VNET_API_ERROR_BFD_NOTSUPP;
+#endif
+}
+
+vnet_api_error_t
+bfd_session_set_params (bfd_main_t * bm, bfd_session_t * bs,
+ u32 desired_min_tx_usec,
+ u32 required_min_rx_usec, u8 detect_mult)
+{
+ if (bs->local_detect_mult != detect_mult ||
+ bs->config_desired_min_tx_usec != desired_min_tx_usec ||
+ bs->config_required_min_rx_usec != required_min_rx_usec)
+ {
+ BFD_DBG ("\nChanging session params: %U", format_bfd_session, bs);
+ switch (bs->poll_state)
+ {
+ case BFD_POLL_NOT_NEEDED:
+ if (BFD_STATE_up == bs->local_state ||
+ BFD_STATE_init == bs->local_state)
+ {
+ /* poll sequence is not needed for detect multiplier change */
+ if (bs->config_desired_min_tx_usec != desired_min_tx_usec ||
+ bs->config_required_min_rx_usec != required_min_rx_usec)
+ {
+ bfd_set_poll_state (bs, BFD_POLL_NEEDED);
+ }
+ }
+ break;
+ case BFD_POLL_NEEDED:
+ case BFD_POLL_IN_PROGRESS_AND_QUEUED:
+ /*
+ * nothing to do - will be handled in the future poll which is
+ * already scheduled for execution
+ */
+ break;
+ case BFD_POLL_IN_PROGRESS:
+ /* poll sequence is not needed for detect multiplier change */
+ if (bs->config_desired_min_tx_usec != desired_min_tx_usec ||
+ bs->config_required_min_rx_usec != required_min_rx_usec)
+ {
+ BFD_DBG ("Poll in progress, queueing extra poll, bs_idx=%u",
+ bs->bs_idx);
+ bfd_set_poll_state (bs, BFD_POLL_IN_PROGRESS_AND_QUEUED);
+ }
+ }
+
+ bs->local_detect_mult = detect_mult;
+ bs->config_desired_min_tx_usec = desired_min_tx_usec;
+ bs->config_desired_min_tx_clocks =
+ bfd_usec_to_clocks (bm, desired_min_tx_usec);
+ bs->config_required_min_rx_usec = required_min_rx_usec;
+ bs->config_required_min_rx_clocks =
+ bfd_usec_to_clocks (bm, required_min_rx_usec);
+ BFD_DBG ("\nChanged session params: %U", format_bfd_session, bs);
+
+ vlib_log_info (bm->log_class, "changed session params: %U",
+ format_bfd_session_brief, bs);
+ vlib_process_signal_event (bm->vlib_main, bm->bfd_process_node_index,
+ BFD_EVENT_CONFIG_CHANGED, bs->bs_idx);
+ }
+ else
+ {
+ BFD_DBG ("Ignore parameter change - no change, bs_idx=%u", bs->bs_idx);
+ }
+ return 0;
+}
+
+vnet_api_error_t
+bfd_auth_set_key (u32 conf_key_id, u8 auth_type, u8 key_len,
+ const u8 * key_data)
+{
+ bfd_main_t *bm = &bfd_main;
+#if WITH_LIBSSL > 0
+ bfd_auth_key_t *auth_key = NULL;
+ if (!key_len || key_len > bfd_max_key_len_for_auth_type (auth_type))
+ {
+ vlib_log_err (bm->log_class,
+ "invalid authentication key length for auth_type=%d:%s "
+ "(key_len=%u, must be non-zero, expected max=%u)",
+ auth_type, bfd_auth_type_str (auth_type), key_len,
+ (u32) bfd_max_key_len_for_auth_type (auth_type));
+ return VNET_API_ERROR_INVALID_VALUE;
+ }
+ if (!bfd_auth_type_supported (auth_type))
+ {
+ vlib_log_err (bm->log_class, "unsupported auth type=%d:%s", auth_type,
+ bfd_auth_type_str (auth_type));
+ return VNET_API_ERROR_BFD_NOTSUPP;
+ }
+ uword *key_idx_p = hash_get (bm->auth_key_by_conf_key_id, conf_key_id);
+ if (key_idx_p)
+ {
+ /* modifying existing key - must not be used */
+ const uword key_idx = *key_idx_p;
+ auth_key = pool_elt_at_index (bm->auth_keys, key_idx);
+ if (auth_key->use_count > 0)
+ {
+ vlib_log_err (bm->log_class,
+ "authentication key with conf ID %u in use by %u BFD "
+ "session(s) - cannot modify", conf_key_id,
+ auth_key->use_count);
+ return VNET_API_ERROR_BFD_EINUSE;
+ }
+ }
+ else
+ {
+ /* adding new key */
+ pool_get (bm->auth_keys, auth_key);
+ auth_key->conf_key_id = conf_key_id;
+ hash_set (bm->auth_key_by_conf_key_id, conf_key_id,
+ auth_key - bm->auth_keys);
+ }
+ auth_key->auth_type = auth_type;
+ clib_memset (auth_key->key, 0, sizeof (auth_key->key));
+ clib_memcpy (auth_key->key, key_data, key_len);
+ return 0;
+#else
+ vlib_log_err (bm->log_class,
+ "SSL missing, cannot manipulate authentication keys");
+ return VNET_API_ERROR_BFD_NOTSUPP;
+#endif
+}
+
+vnet_api_error_t
+bfd_auth_del_key (u32 conf_key_id)
+{
+#if WITH_LIBSSL > 0
+ bfd_auth_key_t *auth_key = NULL;
+ bfd_main_t *bm = &bfd_main;
+ uword *key_idx_p = hash_get (bm->auth_key_by_conf_key_id, conf_key_id);
+ if (key_idx_p)
+ {
+ /* deleting existing key - must not be used */
+ const uword key_idx = *key_idx_p;
+ auth_key = pool_elt_at_index (bm->auth_keys, key_idx);
+ if (auth_key->use_count > 0)
+ {
+ vlib_log_err (bm->log_class,
+ "authentication key with conf ID %u in use by %u BFD "
+ "session(s) - cannot delete", conf_key_id,
+ auth_key->use_count);
+ return VNET_API_ERROR_BFD_EINUSE;
+ }
+ hash_unset (bm->auth_key_by_conf_key_id, conf_key_id);
+ clib_memset (auth_key, 0, sizeof (*auth_key));
+ pool_put (bm->auth_keys, auth_key);
+ }
+ else
+ {
+ /* no such key */
+ vlib_log_err (bm->log_class,
+ "authentication key with conf ID %u does not exist",
+ conf_key_id);
+ return VNET_API_ERROR_BFD_ENOENT;
+ }
+ return 0;
+#else
+ vlib_log_err (bm->log_class,
+ "SSL missing, cannot manipulate authentication keys");
+ return VNET_API_ERROR_BFD_NOTSUPP;
+#endif
}
bfd_main_t bfd_main;
Code Review / vpp.git / blobdiff