diff options
Diffstat (limited to 'src/vnet/bfd/bfd_main.c')
| -rw-r--r-- | src/vnet/bfd/bfd_main.c | 689 |
1 files changed, 484 insertions, 205 deletions
diff --git a/src/vnet/bfd/bfd_main.c b/src/vnet/bfd/bfd_main.c index c0fd18dfe57..29c40458bf5 100644 --- a/src/vnet/bfd/bfd_main.c +++ b/src/vnet/bfd/bfd_main.c @@ -17,17 +17,37 @@ * @brief BFD nodes implementation */ +#if WITH_LIBSSL > 0 +#include <openssl/sha.h> +#endif + +#if __SSE4_2__ +#include <x86intrin.h> +#endif + #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> -#if WITH_LIBSSL > 0 -#include <openssl/sha.h> + +static u64 +bfd_calc_echo_checksum (u32 discriminator, u64 expire_time, u32 secret) +{ + u64 checksum = 0; +#if __SSE4_2__ + checksum = _mm_crc32_u64 (0, discriminator); + checksum = _mm_crc32_u64 (checksum, expire_time); + checksum = _mm_crc32_u64 (checksum, secret); +#else + checksum = clib_xxhash (discriminator ^ expire_time ^ secret); #endif + return checksum; +} static u64 bfd_usec_to_clocks (const bfd_main_t * bm, u64 us) @@ -35,6 +55,12 @@ bfd_usec_to_clocks (const bfd_main_t * bm, u64 us) return bm->cpu_cps * ((f64) us / USEC_PER_SECOND); } +static u32 +bfd_clocks_to_usec (const bfd_main_t * bm, u64 clocks) +{ + return (clocks / bm->cpu_cps) * USEC_PER_SECOND; +} + static vlib_node_registration_t bfd_process_node; /* set to 0 here, real values filled at startup */ @@ -81,17 +107,19 @@ 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->config_desired_min_tx_usec = BFD_DEFAULT_DESIRED_MIN_TX_US; + 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 @@ -119,68 +147,90 @@ bfd_set_state (bfd_main_t * bm, bfd_session_t * bs, } } -static void -bfd_recalc_tx_interval (bfd_main_t * bm, bfd_session_t * bs) +static const char * +bfd_poll_state_string (bfd_poll_state_e state) { - if (!bs->local_demand) + switch (state) { - bs->transmit_interval_clocks = - clib_max (bs->effective_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) { @@ -192,23 +242,32 @@ bfd_calc_next_tx (bfd_main_t * bm, bfd_session_t * bs, u64 now) } static void +bfd_calc_next_echo_tx (bfd_main_t * bm, bfd_session_t * bs, u64 now) +{ + bs->echo_tx_timeout_clocks = + bs->echo_last_tx_clocks + bs->echo_transmit_interval_clocks; + if (bs->echo_tx_timeout_clocks < now) + { + /* 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; + } + 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_demand) - { - /* asynchronous mode */ - bs->detection_time_clocks = - bs->remote_detect_mult * - clib_max (bs->effective_required_min_rx_clocks, - bs->remote_desired_min_tx_clocks); - } - else - { - /* demand mode */ - bs->detection_time_clocks = - bs->local_detect_mult * clib_max (bs->config_desired_min_tx_clocks, - bs->remote_min_rx_clocks); - } + bs->detection_time_clocks = + 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); @@ -220,25 +279,37 @@ bfd_set_timer (bfd_main_t * bm, bfd_session_t * bs, u64 now, { 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 || + BFD_POLL_NOT_NEEDED != bs->poll_state) { - next = clib_min (bs->tx_timeout_clocks, rx_timeout); + tx_timeout = bs->tx_timeout_clocks; } - else if (bs->tx_timeout_clocks) + if (tx_timeout && rx_timeout) { - next = bs->tx_timeout_clocks; + next = clib_min (tx_timeout, rx_timeout); + } + else if (tx_timeout) + { + 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 || @@ -271,6 +342,7 @@ bfd_set_effective_desired_min_tx (bfd_main_t * bm, 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); } @@ -287,25 +359,40 @@ bfd_set_effective_required_min_rx (bfd_main_t * bm, static void bfd_set_remote_required_min_rx (bfd_main_t * bm, bfd_session_t * bs, - u64 now, - u32 remote_required_min_rx_usec, - int handling_wakeup) + u64 now, u32 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); - bfd_calc_next_tx (bm, bs, now); - bfd_set_timer (bm, bs, now, handling_wakeup); + 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); + } +} + +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) +{ + if (bs->remote_min_echo_rx_usec != remote_required_min_echo_rx_usec) + { + 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); + } } void bfd_session_start (bfd_main_t * bm, bfd_session_t * bs) { - BFD_DBG ("%U", format_bfd_session, bs); + BFD_DBG ("\nStarting session: %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); @@ -418,11 +505,12 @@ 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_DBG ("\nState changed: %U", format_bfd_session, bs); bfd_event (bm, bs); switch (bs->local_state) { case BFD_STATE_admin_down: + bs->echo = 0; bfd_set_effective_desired_min_tx (bm, bs, now, clib_max (bs->config_desired_min_tx_clocks, @@ -432,6 +520,7 @@ bfd_on_state_change (bfd_main_t * bm, bfd_session_t * bs, u64 now, bfd_set_timer (bm, bs, now, handling_wakeup); break; case BFD_STATE_down: + bs->echo = 0; bfd_set_effective_desired_min_tx (bm, bs, now, clib_max (bs->config_desired_min_tx_clocks, @@ -441,6 +530,7 @@ bfd_on_state_change (bfd_main_t * bm, bfd_session_t * bs, u64 now, bfd_set_timer (bm, bs, now, handling_wakeup); break; case BFD_STATE_init: + 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); @@ -448,7 +538,7 @@ bfd_on_state_change (bfd_main_t * bm, bfd_session_t * bs, u64 now, case BFD_STATE_up: bfd_set_effective_desired_min_tx (bm, bs, now, bs->config_desired_min_tx_clocks); - if (POLL_NOT_NEEDED == bs->poll_state) + if (BFD_POLL_NOT_NEEDED == bs->poll_state) { bfd_set_effective_required_min_rx (bm, bs, now, bs->config_required_min_rx_clocks); @@ -462,13 +552,14 @@ 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 (bs->remote_demand) - { - /* TODO - initiate poll sequence here */ - } - else + /* + * 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) { - /* asynchronous - poll is part of periodic - nothing to do here */ + bs->tx_timeout_clocks = now; } bfd_recalc_detection_time (bm, bs); bfd_set_timer (bm, bs, now, 0); @@ -482,27 +573,36 @@ bfd_add_transport_layer (vlib_main_t * vm, vlib_buffer_t * b, { case BFD_TRANSPORT_UDP4: BFD_DBG ("Transport bfd via udp4, bs_idx=%u", bs->bs_idx); - bfd_add_udp4_transport (vm, b, bs); + bfd_add_udp4_transport (vm, b, bs, 0 /* is_echo */ ); break; case BFD_TRANSPORT_UDP6: BFD_DBG ("Transport bfd via udp6, bs_idx=%u", bs->bs_idx); - bfd_add_udp6_transport (vm, b, bs); + bfd_add_udp6_transport (vm, b, bs, 0 /* is_echo */ ); break; } } -static vlib_buffer_t * -bfd_create_frame_to_next_node (vlib_main_t * vm, bfd_session_t * bs) +static int +bfd_echo_add_transport_layer (vlib_main_t * vm, vlib_buffer_t * b, + 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 echo via udp4, bs_idx=%u", bs->bs_idx); + return bfd_add_udp4_transport (vm, b, 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, b, bs, 1 /* is_echo */ ); + break; } + return 0; +} - vlib_buffer_t *b = vlib_get_buffer (vm, bi); - ASSERT (b->current_data == 0); +static void +bfd_create_frame_to_next_node (vlib_main_t * vm, bfd_session_t * bs, u32 bi) +{ vlib_frame_t *f = vlib_get_frame_to_node (vm, bfd_node_index_by_transport[bs->transport]); @@ -510,9 +610,7 @@ bfd_create_frame_to_next_node (vlib_main_t * vm, bfd_session_t * bs) u32 *to_next = vlib_frame_vector_args (f); to_next[0] = bi; f->n_vectors = 1; - vlib_put_frame_to_node (vm, bfd_node_index_by_transport[bs->transport], f); - return b; } #if WITH_LIBSSL > 0 @@ -583,45 +681,118 @@ bfd_add_auth_section (vlib_buffer_t * b, bfd_session_t * bs) } } +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); - u32 bfd_length = 0; bfd_length = sizeof (bfd_pkt_t); 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->config_desired_min_tx_usec); - pkt->req_min_rx = clib_host_to_net_u32 (bs->config_required_min_rx_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_echo (vlib_main_t * vm, vlib_node_runtime_t * rt, + bfd_main_t * bm, bfd_session_t * bs, u64 now, + int handling_wakeup) +{ + if (!bfd_is_echo_possible (bs)) + { + BFD_DBG ("\nSwitching off echo function: %U", format_bfd_session, bs); + bs->echo = 0; + return; + } + /* sometimes the wheel expires an event a bit sooner than requested, account + for that here */ + if (now + bm->wheel_inaccuracy >= bs->echo_tx_timeout_clocks) + { + BFD_DBG ("\nSending echo packet: %U", format_bfd_session, bs); + u32 bi; + if (vlib_buffer_alloc (vm, &bi, 1) != 1) + { + clib_warning ("buffer allocation failure"); + return; + } + vlib_buffer_t *b = vlib_get_buffer (vm, bi); + ASSERT (b->current_data == 0); + bfd_echo_pkt_t *pkt = vlib_buffer_get_current (b); + 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, b, 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); + bfd_create_frame_to_next_node (vm, bs, bi); + } + 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, int handling_wakeup) { - if (!bs->remote_min_rx_usec) + if (!bs->remote_min_rx_usec && BFD_POLL_NOT_NEEDED == bs->poll_state) { - BFD_DBG - ("bfd.RemoteMinRxInterval is zero, not sending periodic control " - "frame"); + BFD_DBG ("Remote min rx interval is zero, not sending periodic control " + "frame"); return; } - if (POLL_NOT_NEEDED == bs->poll_state && bs->remote_demand && + if (BFD_POLL_NOT_NEEDED == bs->poll_state && bs->remote_demand && BFD_STATE_up == bs->local_state && BFD_STATE_up == bs->remote_state) { /* @@ -630,33 +801,52 @@ bfd_send_periodic (vlib_main_t * vm, vlib_node_runtime_t * rt, * bfd.SessionState is Up, and bfd.RemoteSessionState is Up) and a Poll * Sequence is not being transmitted. */ - BFD_DBG ("bfd.RemoteDemand is non-zero, not sending periodic control " - "frame"); + 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 ("Send periodic control frame for bs_idx=%lu: %U", bs->bs_idx, - format_bfd_session, bs); - vlib_buffer_t *b = bfd_create_frame_to_next_node (vm, bs); - if (!b) + BFD_DBG ("\nSending periodic control frame: %U", format_bfd_session, + bs); + u32 bi; + if (vlib_buffer_alloc (vm, &bi, 1) != 1) { + clib_warning ("buffer allocation failure"); return; } - bfd_init_control_frame (b, bs); - if (POLL_NOT_NEEDED != bs->poll_state) + vlib_buffer_t *b = vlib_get_buffer (vm, bi); + ASSERT (b->current_data == 0); + bfd_init_control_frame (bm, bs, b); + switch (bs->poll_state) { - /* here we are either beginning a new poll sequence or retrying .. */ + 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)); - bs->poll_state = POLL_IN_PROGRESS; 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, b, bs); bs->last_tx_clocks = now; bfd_calc_next_tx (bm, bs, now); + bfd_create_frame_to_next_node (vm, bs, bi); } else { @@ -664,15 +854,14 @@ bfd_send_periodic (vlib_main_t * vm, vlib_node_runtime_t * rt, ("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_init_final_control_frame (vlib_main_t * vm, vlib_buffer_t * b, - bfd_session_t * bs) + bfd_main_t * bm, bfd_session_t * bs) { 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_auth_section (b, bs); bfd_add_transport_layer (vm, b, bs); @@ -681,7 +870,7 @@ bfd_init_final_control_frame (vlib_main_t * vm, vlib_buffer_t * b, * 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 */ - bs->poll_state = POLL_NOT_NEEDED; + bfd_set_poll_state (bs, BFD_POLL_NOT_NEEDED); } static void @@ -703,7 +892,16 @@ bfd_check_rx_timeout (bfd_main_t * bm, bfd_session_t * bs, u64 now, * 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, handling_wakeup); + 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); } } @@ -721,10 +919,30 @@ bfd_on_timeout (vlib_main_t * vm, vlib_node_runtime_t * rt, bfd_main_t * bm, bfd_send_periodic (vm, rt, bm, bs, now, 1); break; case BFD_STATE_init: - /* fallthrough */ + bfd_check_rx_timeout (bm, bs, now, 1); + bfd_send_periodic (vm, rt, bm, bs, now, 1); + break; case BFD_STATE_up: bfd_check_rx_timeout (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, now, + 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, 1); + if (bs->echo) + { + bfd_send_echo (vm, rt, bm, bs, now, 1); + } break; } } @@ -822,6 +1040,7 @@ bfd_process (vlib_main_t * vm, vlib_node_runtime_t * rt, vlib_frame_t * f) { 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); } } if (expired) @@ -894,7 +1113,9 @@ bfd_main_init (vlib_main_t * vm) bm->cpu_cps = 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_US); + 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; @@ -912,14 +1133,28 @@ bfd_main_init (vlib_main_t * vm) 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; 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); + const unsigned limit = 1000; + unsigned counter = 0; + do + { + result->local_discr = random_u32 (&bm->random_seed); + if (counter > limit) + { + clib_warning ("Couldn't allocate unused session discriminator even " + "after %u tries!", limit); + pool_put (bm->sessions, result); + 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); return result; @@ -1372,29 +1607,45 @@ bfd_consume_pkt (bfd_main_t * bm, const bfd_pkt_t * pkt, u32 bs_idx) 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. - */ + 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)); /* FIXME 6.8.2 */ /* FIXME 6.8.4 */ - if (bs->poll_state == POLL_IN_PROGRESS && bfd_pkt_get_final (pkt)) + if (bfd_pkt_get_final (pkt)) { - bs->poll_state = POLL_NOT_NEEDED; - BFD_DBG ("Poll sequence terminated, bs_idx=%u", bs->bs_idx); - if (BFD_STATE_up == bs->local_state) + if (BFD_POLL_IN_PROGRESS == bs->poll_state) { - bfd_set_effective_required_min_rx (bm, bs, now, - bs->config_required_min_rx_clocks); - bfd_recalc_detection_time (bm, bs); - bfd_set_timer (bm, bs, now, 0); + 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, now, + 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) { BFD_DBG ("Session is admin-down, ignoring packet, bs_idx=%u", @@ -1435,52 +1686,75 @@ bfd_consume_pkt (bfd_main_t * bm, const bfd_pkt_t * pkt, u32 bs_idx) } } -static const char * -bfd_poll_state_string (bfd_poll_state_e state) +int +bfd_consume_echo_pkt (bfd_main_t * bm, vlib_buffer_t * b) { - switch (state) + bfd_echo_pkt_t *pkt = NULL; + if (b->current_length != sizeof (*pkt)) { -#define F(x) \ - case POLL_##x: \ - return "POLL_" #x; - foreach_bfd_poll_state (F) -#undef F + return 0; } - return "UNKNOWN"; + 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 *); - s = 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, " - "Auth: {local-seq-num=%u, " - "remote-seq-num=%u, " - "is-delayed=%s, " - "curr-key=%U, " - "next-key=%U}," - "poll-state: %s", + uword indent = format_get_indent (s); + 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), bs->local_discr, - bs->remote_discr, bfd_diag_code_string (bs->local_diag), + 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, - 1, bs->remote_min_rx_usec, (bs->local_demand ? "yes" : "no"), - (bs->remote_demand ? "yes" : "no"), bs->local_detect_mult, - bs->auth.local_seq_number, bs->auth.remote_seq_number, - (bs->auth.is_delayed ? "yes" : "no"), format_bfd_auth_key, - bs->auth.curr_key, format_bfd_auth_key, bs->auth.next_key, - bfd_poll_state_string (bs->poll_state)); + 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; } @@ -1537,7 +1811,7 @@ bfd_auth_activate (bfd_session_t * bs, u32 conf_key_id, bs->auth.is_delayed = 0; } ++key->use_count; - BFD_DBG ("Session auth modified: %U", format_bfd_session, bs); + BFD_DBG ("\nSession auth modified: %U", format_bfd_session, bs); return 0; } @@ -1571,7 +1845,7 @@ bfd_auth_deactivate (bfd_session_t * bs, u8 is_delayed) --bs->auth.next_key->use_count; bs->auth.next_key = NULL; } - BFD_DBG ("Session auth modified: %U", format_bfd_session, bs); + BFD_DBG ("\nSession auth modified: %U", format_bfd_session, bs); return 0; #else clib_warning ("SSL missing, cannot deactivate BFD authentication"); @@ -1588,10 +1862,10 @@ bfd_session_set_params (bfd_main_t * bm, bfd_session_t * bs, bs->config_desired_min_tx_usec != desired_min_tx_usec || bs->config_required_min_rx_usec != required_min_rx_usec) { - BFD_DBG ("Changing session params: %U", format_bfd_session, bs); + BFD_DBG ("\nChanging session params: %U", format_bfd_session, bs); switch (bs->poll_state) { - case POLL_NOT_NEEDED: + case BFD_POLL_NOT_NEEDED: if (BFD_STATE_up == bs->local_state || BFD_STATE_init == bs->local_state) { @@ -1599,21 +1873,26 @@ bfd_session_set_params (bfd_main_t * bm, bfd_session_t * bs, if (bs->config_desired_min_tx_usec != desired_min_tx_usec || bs->config_required_min_rx_usec != required_min_rx_usec) { - bs->poll_state = POLL_NEEDED; - BFD_DBG ("Set poll state=%s, bs_idx=%u", - bfd_poll_state_string (bs->poll_state), - bs->bs_idx); + bfd_set_poll_state (bs, BFD_POLL_NEEDED); } } break; - case POLL_NEEDED: - /* nothing to do */ + 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 POLL_IN_PROGRESS: - /* can't change params now ... */ - BFD_ERR ("Poll in progress, cannot change params for session with " - "bs_idx=%u", bs->bs_idx); - return VNET_API_ERROR_BFD_EAGAIN; + 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; @@ -1623,7 +1902,7 @@ bfd_session_set_params (bfd_main_t * bm, bfd_session_t * bs, 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 ("Changed session params: %U", format_bfd_session, bs); + BFD_DBG ("\nChanged session params: %U", format_bfd_session, bs); vlib_process_signal_event (bm->vlib_main, bm->bfd_process_node_index, BFD_EVENT_CONFIG_CHANGED, bs->bs_idx); |