diff options
Diffstat (limited to 'src/vnet/bfd/bfd_main.c')
| -rw-r--r-- | src/vnet/bfd/bfd_main.c | 969 |
1 files changed, 969 insertions, 0 deletions
diff --git a/src/vnet/bfd/bfd_main.c b/src/vnet/bfd/bfd_main.c new file mode 100644 index 00000000000..e25eadfc510 --- /dev/null +++ b/src/vnet/bfd/bfd_main.c @@ -0,0 +1,969 @@ +/* + * Copyright (c) 2011-2016 Cisco and/or its affiliates. + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at: + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +/** + * @file + * @brief BFD nodes implementation + */ + +#include <vppinfra/random.h> +#include <vppinfra/error.h> +#include <vppinfra/hash.h> +#include <vnet/ethernet/ethernet.h> +#include <vnet/ethernet/packet.h> +#include <vnet/bfd/bfd_debug.h> +#include <vnet/bfd/bfd_protocol.h> +#include <vnet/bfd/bfd_main.h> + +static u64 +bfd_us_to_clocks (bfd_main_t * bm, u64 us) +{ + return bm->cpu_cps * ((f64) us / USEC_PER_SECOND); +} + +static vlib_node_registration_t bfd_process_node; + +typedef enum +{ +#define F(t, n) BFD_OUTPUT_##t, + foreach_bfd_transport (F) +#undef F + BFD_OUTPUT_N_NEXT, +} bfd_output_next_t; + +static u32 bfd_next_index_by_transport[] = { +#define F(t, n) [BFD_TRANSPORT_##t] = BFD_OUTPUT_##t, + foreach_bfd_transport (F) +#undef F +}; + +/* + * We actually send all bfd pkts to the "error" node after scanning + * them, so the graph node has only one next-index. The "error-drop" + * node automatically bumps our per-node packet counters for us. + */ +typedef enum +{ + BFD_INPUT_NEXT_NORMAL, + BFD_INPUT_N_NEXT, +} bfd_input_next_t; + +static void bfd_on_state_change (bfd_main_t * bm, bfd_session_t * bs, u64 now, + int handling_wakeup); + +static void +bfd_set_defaults (bfd_main_t * bm, bfd_session_t * bs) +{ + bs->local_state = BFD_STATE_down; + bs->local_diag = BFD_DIAG_CODE_no_diag; + bs->remote_state = BFD_STATE_down; + bs->local_demand = 0; + bs->remote_discr = 0; + bs->desired_min_tx_us = BFD_DEFAULT_DESIRED_MIN_TX_US; + bs->desired_min_tx_clocks = bfd_us_to_clocks (bm, bs->desired_min_tx_us); + bs->remote_min_rx_us = 1; + bs->remote_demand = 0; +} + +static void +bfd_set_diag (bfd_session_t * bs, bfd_diag_code_e code) +{ + if (bs->local_diag != code) + { + BFD_DBG ("set local_diag, bs_idx=%d: '%d:%s'", bs->bs_idx, code, + bfd_diag_code_string (code)); + bs->local_diag = code; + } +} + +static void +bfd_set_state (bfd_main_t * bm, bfd_session_t * bs, + bfd_state_e new_state, int handling_wakeup) +{ + if (bs->local_state != new_state) + { + BFD_DBG ("Change state, bs_idx=%d: %s->%s", bs->bs_idx, + bfd_state_string (bs->local_state), + bfd_state_string (new_state)); + bs->local_state = new_state; + bfd_on_state_change (bm, bs, clib_cpu_time_now (), handling_wakeup); + } +} + +static void +bfd_recalc_tx_interval (bfd_main_t * bm, bfd_session_t * bs) +{ + if (!bs->local_demand) + { + bs->transmit_interval_clocks = + clib_max (bs->desired_min_tx_clocks, bs->remote_min_rx_clocks); + } + else + { + /* TODO */ + } + BFD_DBG ("Recalculated transmit interval %lu clocks/%.2fs", + bs->transmit_interval_clocks, + bs->transmit_interval_clocks / bm->cpu_cps); +} + +static void +bfd_calc_next_tx (bfd_main_t * bm, bfd_session_t * bs, u64 now) +{ + if (!bs->local_demand) + { + if (bs->local_detect_mult > 1) + { + /* common case - 75-100% of transmit interval */ + bs->tx_timeout_clocks = now + + (1 - .25 * (random_f64 (&bm->random_seed))) * + bs->transmit_interval_clocks; + if (bs->tx_timeout_clocks < now) + { + /* huh, we've missed it already, skip the missed events */ + const u64 missed = + (now - bs->tx_timeout_clocks) / bs->transmit_interval_clocks; + BFD_ERR ("Missed %lu transmit events (now is %lu, calc " + "tx_timeout is %lu)!", + missed, now, bs->tx_timeout_clocks); + bs->tx_timeout_clocks += + (missed + 1) * bs->transmit_interval_clocks; + } + } + else + { + /* special case - 75-90% of transmit interval */ + bs->tx_timeout_clocks = + now + + (.9 - .15 * (random_f64 (&bm->random_seed))) * + bs->transmit_interval_clocks; + if (bs->tx_timeout_clocks < now) + { + /* huh, we've missed it already, skip the missed events */ + const u64 missed = + (now - bs->tx_timeout_clocks) / bs->transmit_interval_clocks; + BFD_ERR ("Missed %lu transmit events (now is %lu, calc " + "tx_timeout is %lu)!", + missed, now, bs->tx_timeout_clocks); + bs->tx_timeout_clocks += + (missed + 1) * bs->transmit_interval_clocks; + } + } + } + else + { + /* TODO */ + } + if (bs->tx_timeout_clocks) + { + BFD_DBG ("Next transmit in %lu clocks/%.02fs@%lu", + bs->tx_timeout_clocks - now, + (bs->tx_timeout_clocks - now) / bm->cpu_cps, + bs->tx_timeout_clocks); + } +} + +static void +bfd_recalc_detection_time (bfd_main_t * bm, bfd_session_t * bs) +{ + if (!bs->local_demand) + { + bs->detection_time_clocks = + bs->remote_detect_mult * + bfd_us_to_clocks (bm, clib_max (bs->required_min_rx_us, + bs->remote_desired_min_tx_us)); + } + else + { + bs->detection_time_clocks = + bs->local_detect_mult * + bfd_us_to_clocks (bm, + clib_max (bs->desired_min_tx_us, + bs->remote_min_rx_us)); + } + BFD_DBG ("Recalculated detection time %lu clocks/%.2fs", + bs->detection_time_clocks, + bs->detection_time_clocks / bm->cpu_cps); +} + +static void +bfd_set_timer (bfd_main_t * bm, bfd_session_t * bs, u64 now, + int handling_wakeup) +{ + u64 next = 0; + u64 rx_timeout = 0; + if (BFD_STATE_up == bs->local_state) + { + rx_timeout = bs->last_rx_clocks + bs->detection_time_clocks; + } + if (bs->tx_timeout_clocks && rx_timeout) + { + next = clib_min (bs->tx_timeout_clocks, rx_timeout); + } + else if (bs->tx_timeout_clocks) + { + next = bs->tx_timeout_clocks; + } + else if (rx_timeout) + { + next = rx_timeout; + } + BFD_DBG ("bs_idx=%u, tx_timeout=%lu, rx_timeout=%lu, next=%s", bs->bs_idx, + bs->tx_timeout_clocks, rx_timeout, + next == bs->tx_timeout_clocks ? "tx" : "rx"); + /* sometimes the wheel expires an event a bit sooner than requested, account + for that here */ + if (next && (now + bm->wheel_inaccuracy > bs->wheel_time_clocks || + next < bs->wheel_time_clocks || !bs->wheel_time_clocks)) + { + bs->wheel_time_clocks = next; + BFD_DBG ("timing_wheel_insert(%p, %lu (%ld clocks/%.2fs in the " + "future), %u);", + &bm->wheel, bs->wheel_time_clocks, + (i64) bs->wheel_time_clocks - clib_cpu_time_now (), + (i64) (bs->wheel_time_clocks - clib_cpu_time_now ()) / + bm->cpu_cps, bs->bs_idx); + timing_wheel_insert (&bm->wheel, bs->wheel_time_clocks, bs->bs_idx); + if (!handling_wakeup) + { + vlib_process_signal_event (bm->vlib_main, + bm->bfd_process_node_index, + BFD_EVENT_RESCHEDULE, bs->bs_idx); + } + } +} + +static void +bfd_set_desired_min_tx (bfd_main_t * bm, bfd_session_t * bs, u64 now, + u32 desired_min_tx_us, int handling_wakeup) +{ + bs->desired_min_tx_us = desired_min_tx_us; + bs->desired_min_tx_clocks = bfd_us_to_clocks (bm, bs->desired_min_tx_us); + BFD_DBG ("Set desired min tx to %uus/%lu clocks/%.2fs", + bs->desired_min_tx_us, bs->desired_min_tx_clocks, + bs->desired_min_tx_clocks / bm->cpu_cps); + bfd_recalc_detection_time (bm, bs); + bfd_recalc_tx_interval (bm, bs); + bfd_calc_next_tx (bm, bs, now); + bfd_set_timer (bm, bs, now, handling_wakeup); +} + +static void +bfd_set_remote_required_min_rx (bfd_main_t * bm, bfd_session_t * bs, + u64 now, + u32 remote_required_min_rx_us, + int handling_wakeup) +{ + bs->remote_min_rx_us = remote_required_min_rx_us; + bs->remote_min_rx_clocks = bfd_us_to_clocks (bm, bs->remote_min_rx_us); + BFD_DBG ("Set remote min rx to %uus/%lu clocks/%.2fs", bs->remote_min_rx_us, + bs->remote_min_rx_clocks, bs->remote_min_rx_clocks / bm->cpu_cps); + bfd_recalc_detection_time (bm, bs); + bfd_recalc_tx_interval (bm, bs); + bfd_calc_next_tx (bm, bs, now); + bfd_set_timer (bm, bs, now, handling_wakeup); +} + +void +bfd_session_start (bfd_main_t * bm, bfd_session_t * bs) +{ + BFD_DBG ("%U", format_bfd_session, bs); + bfd_recalc_tx_interval (bm, bs); + vlib_process_signal_event (bm->vlib_main, bm->bfd_process_node_index, + BFD_EVENT_NEW_SESSION, bs->bs_idx); +} + +vnet_api_error_t +bfd_del_session (uword bs_idx) +{ + const bfd_main_t *bm = &bfd_main; + if (!pool_is_free_index (bm->sessions, bs_idx)) + { + bfd_session_t *bs = pool_elt_at_index (bm->sessions, bs_idx); + pool_put (bm->sessions, bs); + return 0; + } + else + { + BFD_ERR ("no such session"); + return VNET_API_ERROR_BFD_NOENT; + } + return 0; +} + +const char * +bfd_diag_code_string (bfd_diag_code_e diag) +{ +#define F(n, t, s) \ + case BFD_DIAG_CODE_NAME (t): \ + return s; + switch (diag) + { + foreach_bfd_diag_code (F)} + return "UNKNOWN"; +#undef F +} + +const char * +bfd_state_string (bfd_state_e state) +{ +#define F(n, t, s) \ + case BFD_STATE_NAME (t): \ + return s; + switch (state) + { + foreach_bfd_state (F)} + return "UNKNOWN"; +#undef F +} + +vnet_api_error_t +bfd_session_set_flags (u32 bs_idx, u8 admin_up_down) +{ + bfd_main_t *bm = &bfd_main; + if (pool_is_free_index (bm->sessions, bs_idx)) + { + BFD_ERR ("invalid bs_idx=%u", bs_idx); + return VNET_API_ERROR_BFD_NOENT; + } + bfd_session_t *bs = pool_elt_at_index (bm->sessions, bs_idx); + if (admin_up_down) + { + bfd_set_state (bm, bs, BFD_STATE_down, 0); + } + else + { + bfd_set_diag (bs, BFD_DIAG_CODE_neighbor_sig_down); + bfd_set_state (bm, bs, BFD_STATE_admin_down, 0); + } + return 0; +} + +u8 * +bfd_input_format_trace (u8 * s, va_list * args) +{ + CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *); + CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *); + const bfd_input_trace_t *t = va_arg (*args, bfd_input_trace_t *); + const bfd_pkt_t *pkt = (bfd_pkt_t *) t->data; + if (t->len > STRUCT_SIZE_OF (bfd_pkt_t, head)) + { + s = format (s, "BFD v%u, diag=%u(%s), state=%u(%s),\n" + " flags=(P:%u, F:%u, C:%u, A:%u, D:%u, M:%u), detect_mult=%u, " + "length=%u\n", + bfd_pkt_get_version (pkt), bfd_pkt_get_diag_code (pkt), + bfd_diag_code_string (bfd_pkt_get_diag_code (pkt)), + bfd_pkt_get_state (pkt), + bfd_state_string (bfd_pkt_get_state (pkt)), + bfd_pkt_get_poll (pkt), bfd_pkt_get_final (pkt), + bfd_pkt_get_control_plane_independent (pkt), + bfd_pkt_get_auth_present (pkt), bfd_pkt_get_demand (pkt), + bfd_pkt_get_multipoint (pkt), pkt->head.detect_mult, + pkt->head.length); + if (t->len >= sizeof (bfd_pkt_t) + && pkt->head.length >= sizeof (bfd_pkt_t)) + { + s = format (s, " my discriminator: %u\n", pkt->my_disc); + s = format (s, " your discriminator: %u\n", pkt->your_disc); + s = format (s, " desired min tx interval: %u\n", + clib_net_to_host_u32 (pkt->des_min_tx)); + s = format (s, " required min rx interval: %u\n", + clib_net_to_host_u32 (pkt->req_min_rx)); + s = format (s, " required min echo rx interval: %u\n", + clib_net_to_host_u32 (pkt->req_min_echo_rx)); + } + } + + return s; +} + +static void +bfd_on_state_change (bfd_main_t * bm, bfd_session_t * bs, u64 now, + int handling_wakeup) +{ + BFD_DBG ("State changed: %U", format_bfd_session, bs); + bfd_event (bm, bs); + switch (bs->local_state) + { + case BFD_STATE_admin_down: + bfd_set_desired_min_tx (bm, bs, now, + clib_max (bs->config_desired_min_tx_us, + BFD_DEFAULT_DESIRED_MIN_TX_US), + handling_wakeup); + break; + case BFD_STATE_down: + bfd_set_desired_min_tx (bm, bs, now, + clib_max (bs->config_desired_min_tx_us, + BFD_DEFAULT_DESIRED_MIN_TX_US), + handling_wakeup); + break; + case BFD_STATE_init: + bfd_set_desired_min_tx (bm, bs, now, + clib_max (bs->config_desired_min_tx_us, + BFD_DEFAULT_DESIRED_MIN_TX_US), + handling_wakeup); + break; + case BFD_STATE_up: + bfd_set_desired_min_tx (bm, bs, now, bs->config_desired_min_tx_us, + handling_wakeup); + break; + } +} + +static void +bfd_add_transport_layer (vlib_main_t * vm, vlib_buffer_t * b, + bfd_session_t * bs) +{ + switch (bs->transport) + { + case BFD_TRANSPORT_UDP4: + /* fallthrough */ + case BFD_TRANSPORT_UDP6: + BFD_DBG ("Transport bfd via udp, bs_idx=%u", bs->bs_idx); + bfd_add_udp_transport (vm, b, &bs->udp); + break; + } +} + +static vlib_buffer_t * +bfd_create_frame (vlib_main_t * vm, vlib_node_runtime_t * rt, + bfd_session_t * bs) +{ + u32 bi; + if (vlib_buffer_alloc (vm, &bi, 1) != 1) + { + clib_warning ("buffer allocation failure"); + return NULL; + } + + vlib_buffer_t *b = vlib_get_buffer (vm, bi); + ASSERT (b->current_data == 0); + + u32 *to_next; + u32 n_left_to_next; + + vlib_get_next_frame (vm, rt, bfd_next_index_by_transport[bs->transport], + to_next, n_left_to_next); + + to_next[0] = bi; + n_left_to_next -= 1; + + vlib_put_next_frame (vm, rt, bfd_next_index_by_transport[bs->transport], + n_left_to_next); + return b; +} + +static void +bfd_init_control_frame (vlib_buffer_t * b, bfd_session_t * bs) +{ + bfd_pkt_t *pkt = vlib_buffer_get_current (b); + const u32 bfd_length = 24; + memset (pkt, 0, sizeof (*pkt)); + + bfd_pkt_set_version (pkt, 1); + bfd_pkt_set_diag_code (pkt, bs->local_diag); + bfd_pkt_set_state (pkt, bs->local_state); + if (bs->local_demand && BFD_STATE_up == bs->local_state && + BFD_STATE_up == bs->remote_state) + { + bfd_pkt_set_demand (pkt); + } + pkt->head.detect_mult = bs->local_detect_mult; + pkt->head.length = clib_host_to_net_u32 (bfd_length); + pkt->my_disc = bs->local_discr; + pkt->your_disc = bs->remote_discr; + pkt->des_min_tx = clib_host_to_net_u32 (bs->desired_min_tx_us); + pkt->req_min_rx = clib_host_to_net_u32 (bs->required_min_rx_us); + pkt->req_min_echo_rx = clib_host_to_net_u32 (0); /* FIXME */ + b->current_length = bfd_length; +} + +static void +bfd_send_periodic (vlib_main_t * vm, vlib_node_runtime_t * rt, + bfd_main_t * bm, bfd_session_t * bs, u64 now, + int handling_wakeup) +{ + if (!bs->remote_min_rx_us) + { + BFD_DBG + ("bfd.RemoteMinRxInterval is zero, not sending periodic control " + "frame"); + return; + } + /* FIXME + A system MUST NOT periodically transmit BFD Control packets if Demand + mode is active on the remote system (bfd.RemoteDemandMode is 1, + bfd.SessionState is Up, and bfd.RemoteSessionState is Up) and a Poll + Sequence is not being transmitted. + */ + /* sometimes the wheel expires an event a bit sooner than requested, account + for that here */ + if (now + bm->wheel_inaccuracy >= bs->tx_timeout_clocks) + { + BFD_DBG ("Send periodic control frame for bs_idx=%lu", bs->bs_idx); + vlib_buffer_t *b = bfd_create_frame (vm, rt, bs); + if (!b) + { + return; + } + bfd_init_control_frame (b, bs); + bfd_add_transport_layer (vm, b, bs); + bfd_calc_next_tx (bm, bs, now); + } + else + { + BFD_DBG + ("No need to send control frame now, now is %lu, tx_timeout is %lu", + now, bs->tx_timeout_clocks); + } + bfd_set_timer (bm, bs, now, handling_wakeup); +} + +void +bfd_send_final (vlib_main_t * vm, vlib_buffer_t * b, bfd_session_t * bs) +{ + BFD_DBG ("Send final control frame for bs_idx=%lu", bs->bs_idx); + bfd_init_control_frame (b, bs); + bfd_pkt_set_final (vlib_buffer_get_current (b)); + bfd_add_transport_layer (vm, b, bs); +} + +static void +bfd_check_rx_timeout (bfd_main_t * bm, bfd_session_t * bs, u64 now, + int handling_wakeup) +{ + /* sometimes the wheel expires an event a bit sooner than requested, account + for that here */ + if (bs->last_rx_clocks + bs->detection_time_clocks <= + now + bm->wheel_inaccuracy) + { + BFD_DBG ("Rx timeout, session goes down"); + bfd_set_diag (bs, BFD_DIAG_CODE_det_time_exp); + bfd_set_state (bm, bs, BFD_STATE_down, handling_wakeup); + } +} + +void +bfd_on_timeout (vlib_main_t * vm, vlib_node_runtime_t * rt, bfd_main_t * bm, + bfd_session_t * bs, u64 now) +{ + BFD_DBG ("Timeout for bs_idx=%lu", bs->bs_idx); + switch (bs->local_state) + { + case BFD_STATE_admin_down: + BFD_ERR ("Unexpected timeout when in %s state", + bfd_state_string (bs->local_state)); + abort (); + break; + case BFD_STATE_down: + bfd_send_periodic (vm, rt, bm, bs, now, 1); + break; + case BFD_STATE_init: + BFD_ERR ("Unexpected timeout when in %s state", + bfd_state_string (bs->local_state)); + abort (); + break; + case BFD_STATE_up: + bfd_check_rx_timeout (bm, bs, now, 1); + bfd_send_periodic (vm, rt, bm, bs, now, 1); + break; + } +} + +/* + * bfd process node function + */ +static uword +bfd_process (vlib_main_t * vm, vlib_node_runtime_t * rt, vlib_frame_t * f) +{ + bfd_main_t *bm = &bfd_main; + u32 *expired = 0; + uword event_type, *event_data = 0; + + /* So we can send events to the bfd process */ + bm->bfd_process_node_index = bfd_process_node.index; + + while (1) + { + u64 now = clib_cpu_time_now (); + u64 next_expire = timing_wheel_next_expiring_elt_time (&bm->wheel); + BFD_DBG ("timing_wheel_next_expiring_elt_time(%p) returns %lu", + &bm->wheel, next_expire); + if ((i64) next_expire < 0) + { + BFD_DBG ("wait for event without timeout"); + (void) vlib_process_wait_for_event (vm); + event_type = vlib_process_get_events (vm, &event_data); + } + else + { + f64 timeout = ((i64) next_expire - (i64) now) / bm->cpu_cps; + BFD_DBG ("wait for event with timeout %.02f", timeout); + if (timeout < 0) + { + BFD_DBG ("negative timeout, already expired, skipping wait"); + event_type = ~0; + } + else + { + (void) vlib_process_wait_for_event_or_clock (vm, timeout); + event_type = vlib_process_get_events (vm, &event_data); + } + } + now = clib_cpu_time_now (); + switch (event_type) + { + case ~0: /* no events => timeout */ + /* nothing to do here */ + break; + case BFD_EVENT_RESCHEDULE: + /* nothing to do here - reschedule is done automatically after + * each event or timeout */ + break; + case BFD_EVENT_NEW_SESSION: + do + { + bfd_session_t *bs = + pool_elt_at_index (bm->sessions, *event_data); + bfd_send_periodic (vm, rt, bm, bs, now, 1); + } + while (0); + break; + default: + clib_warning ("BUG: event type 0x%wx", event_type); + break; + } + BFD_DBG ("advancing wheel, now is %lu", now); + BFD_DBG ("timing_wheel_advance (%p, %lu, %p, 0);", &bm->wheel, now, + expired); + expired = timing_wheel_advance (&bm->wheel, now, expired, 0); + BFD_DBG ("Expired %d elements", vec_len (expired)); + u32 *p = NULL; + vec_foreach (p, expired) + { + const u32 bs_idx = *p; + if (!pool_is_free_index (bm->sessions, bs_idx)) + { + bfd_session_t *bs = pool_elt_at_index (bm->sessions, bs_idx); + bfd_on_timeout (vm, rt, bm, bs, now); + } + } + if (expired) + { + _vec_len (expired) = 0; + } + if (event_data) + { + _vec_len (event_data) = 0; + } + } + + return 0; +} + +/* + * bfd process node declaration + */ +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (bfd_process_node, static) = { + .function = bfd_process, + .type = VLIB_NODE_TYPE_PROCESS, + .name = "bfd-process", + .n_next_nodes = BFD_OUTPUT_N_NEXT, + .next_nodes = + { +#define F(t, n) [BFD_OUTPUT_##t] = n, + foreach_bfd_transport (F) +#undef F + }, +}; +/* *INDENT-ON* */ + +static clib_error_t * +bfd_sw_interface_up_down (vnet_main_t * vnm, u32 sw_if_index, u32 flags) +{ + // bfd_main_t *bm = &bfd_main; + // vnet_hw_interface_t *hi = vnet_get_sup_hw_interface (vnm, sw_if_index); + if (!(flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)) + { + /* TODO */ + } + return 0; +} + +VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION (bfd_sw_interface_up_down); + +static clib_error_t * +bfd_hw_interface_up_down (vnet_main_t * vnm, u32 hw_if_index, u32 flags) +{ + // bfd_main_t *bm = &bfd_main; + if (flags & VNET_HW_INTERFACE_FLAG_LINK_UP) + { + /* TODO */ + } + return 0; +} + +VNET_HW_INTERFACE_LINK_UP_DOWN_FUNCTION (bfd_hw_interface_up_down); + +/* + * setup function + */ +static clib_error_t * +bfd_main_init (vlib_main_t * vm) +{ + bfd_main_t *bm = &bfd_main; + bm->random_seed = random_default_seed (); + bm->vlib_main = vm; + bm->vnet_main = vnet_get_main (); + memset (&bm->wheel, 0, sizeof (bm->wheel)); + bm->cpu_cps = 2590000000; // vm->clib_time.clocks_per_second; + BFD_DBG ("cps is %.2f", bm->cpu_cps); + const u64 now = clib_cpu_time_now (); + timing_wheel_init (&bm->wheel, now, bm->cpu_cps); + bm->wheel_inaccuracy = 2 << bm->wheel.log2_clocks_per_bin; + + return 0; +} + +VLIB_INIT_FUNCTION (bfd_main_init); + +bfd_session_t * +bfd_get_session (bfd_main_t * bm, bfd_transport_t t) +{ + bfd_session_t *result; + pool_get (bm->sessions, result); + memset (result, 0, sizeof (*result)); + result->bs_idx = result - bm->sessions; + result->transport = t; + result->local_discr = random_u32 (&bm->random_seed); + bfd_set_defaults (bm, result); + hash_set (bm->session_by_disc, result->local_discr, result->bs_idx); + return result; +} + +void +bfd_put_session (bfd_main_t * bm, bfd_session_t * bs) +{ + hash_unset (bm->session_by_disc, bs->local_discr); + pool_put (bm->sessions, bs); +} + +bfd_session_t * +bfd_find_session_by_idx (bfd_main_t * bm, uword bs_idx) +{ + if (!pool_is_free_index (bm->sessions, bs_idx)) + { + return pool_elt_at_index (bm->sessions, bs_idx); + } + return NULL; +} + +bfd_session_t * +bfd_find_session_by_disc (bfd_main_t * bm, u32 disc) +{ + uword *p = hash_get (bfd_main.session_by_disc, disc); + if (p) + { + return pool_elt_at_index (bfd_main.sessions, *p); + } + return NULL; +} + +/** + * @brief verify bfd packet - common checks + * + * @param pkt + * + * @return 1 if bfd packet is valid + */ +int +bfd_verify_pkt_common (const bfd_pkt_t * pkt) +{ + if (1 != bfd_pkt_get_version (pkt)) + { + BFD_ERR ("BFD verification failed - unexpected version: '%d'", + bfd_pkt_get_version (pkt)); + return 0; + } + if (pkt->head.length < sizeof (bfd_pkt_t) || + (bfd_pkt_get_auth_present (pkt) && + pkt->head.length < sizeof (bfd_pkt_with_auth_t))) + { + BFD_ERR ("BFD verification failed - unexpected length: '%d' (auth " + "present: %d)", + pkt->head.length, bfd_pkt_get_auth_present (pkt)); + return 0; + } + if (!pkt->head.detect_mult) + { + BFD_ERR ("BFD verification failed - unexpected detect-mult: '%d'", + pkt->head.detect_mult); + return 0; + } + if (bfd_pkt_get_multipoint (pkt)) + { + BFD_ERR ("BFD verification failed - unexpected multipoint: '%d'", + bfd_pkt_get_multipoint (pkt)); + return 0; + } + if (!pkt->my_disc) + { + BFD_ERR ("BFD verification failed - unexpected my-disc: '%d'", + pkt->my_disc); + return 0; + } + if (!pkt->your_disc) + { + const u8 pkt_state = bfd_pkt_get_state (pkt); + if (pkt_state != BFD_STATE_down && pkt_state != BFD_STATE_admin_down) + { + BFD_ERR ("BFD verification failed - unexpected state: '%s' " + "(your-disc is zero)", bfd_state_string (pkt_state)); + return 0; + } + } + return 1; +} + +/** + * @brief verify bfd packet - authentication + * + * @param pkt + * + * @return 1 if bfd packet is valid + */ +int +bfd_verify_pkt_session (const bfd_pkt_t * pkt, u16 pkt_size, + const bfd_session_t * bs) +{ + const bfd_pkt_with_auth_t *with_auth = (bfd_pkt_with_auth_t *) pkt; + if (!bfd_pkt_get_auth_present (pkt)) + { + if (pkt_size > sizeof (*pkt)) + { + BFD_ERR ("BFD verification failed - unexpected packet size '%d' " + "(auth not present)", pkt_size); + return 0; + } + } + else + { + if (!with_auth->auth.type) + { + BFD_ERR ("BFD verification failed - unexpected auth type: '%d'", + with_auth->auth.type); + return 0; + } + /* TODO FIXME - implement the actual verification */ + } + return 1; +} + +void +bfd_consume_pkt (bfd_main_t * bm, const bfd_pkt_t * pkt, u32 bs_idx) +{ + bfd_session_t *bs = bfd_find_session_by_idx (bm, bs_idx); + if (!bs) + { + return; + } + BFD_DBG ("Scanning bfd packet, bs_idx=%d", bs->bs_idx); + bs->remote_discr = pkt->my_disc; + bs->remote_state = bfd_pkt_get_state (pkt); + bs->remote_demand = bfd_pkt_get_demand (pkt); + u64 now = clib_cpu_time_now (); + bs->last_rx_clocks = now; + bs->remote_desired_min_tx_us = clib_net_to_host_u32 (pkt->des_min_tx); + bs->remote_detect_mult = pkt->head.detect_mult; + bfd_set_remote_required_min_rx (bm, bs, now, + clib_net_to_host_u32 (pkt->req_min_rx), 0); + /* FIXME + If the Required Min Echo RX Interval field is zero, the + transmission of Echo packets, if any, MUST cease. + + If a Poll Sequence is being transmitted by the local system and + the Final (F) bit in the received packet is set, the Poll Sequence + MUST be terminated. + */ + /* FIXME 6.8.2 */ + /* FIXME 6.8.4 */ + if (BFD_STATE_admin_down == bs->local_state) + return; + if (BFD_STATE_admin_down == bs->remote_state) + { + bfd_set_diag (bs, BFD_DIAG_CODE_neighbor_sig_down); + bfd_set_state (bm, bs, BFD_STATE_down, 0); + } + else if (BFD_STATE_down == bs->local_state) + { + if (BFD_STATE_down == bs->remote_state) + { + bfd_set_state (bm, bs, BFD_STATE_init, 0); + } + else if (BFD_STATE_init == bs->remote_state) + { + bfd_set_state (bm, bs, BFD_STATE_up, 0); + } + } + else if (BFD_STATE_init == bs->local_state) + { + if (BFD_STATE_up == bs->remote_state || + BFD_STATE_init == bs->remote_state) + { + bfd_set_state (bm, bs, BFD_STATE_up, 0); + } + } + else /* BFD_STATE_up == bs->local_state */ + { + if (BFD_STATE_down == bs->remote_state) + { + bfd_set_diag (bs, BFD_DIAG_CODE_neighbor_sig_down); + bfd_set_state (bm, bs, BFD_STATE_down, 0); + } + } +} + +u8 * +format_bfd_session (u8 * s, va_list * args) +{ + const bfd_session_t *bs = va_arg (*args, bfd_session_t *); + return format (s, "BFD(%u): bfd.SessionState=%s, " + "bfd.RemoteSessionState=%s, " + "bfd.LocalDiscr=%u, " + "bfd.RemoteDiscr=%u, " + "bfd.LocalDiag=%s, " + "bfd.DesiredMinTxInterval=%u, " + "bfd.RequiredMinRxInterval=%u, " + "bfd.RemoteMinRxInterval=%u, " + "bfd.DemandMode=%s, " + "bfd.RemoteDemandMode=%s, " + "bfd.DetectMult=%u, ", + bs->bs_idx, bfd_state_string (bs->local_state), + bfd_state_string (bs->remote_state), bs->local_discr, + bs->remote_discr, bfd_diag_code_string (bs->local_diag), + bs->desired_min_tx_us, bs->required_min_rx_us, + bs->remote_min_rx_us, (bs->local_demand ? "yes" : "no"), + (bs->remote_demand ? "yes" : "no"), bs->local_detect_mult); +} + +bfd_main_t bfd_main; + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ |