blob: 0cc7d72c600a66f8315ef037dd148bf9b0ce0ad3 [file] [log] [blame]
/*
* 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
*/
#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_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 (clocks / bm->cpu_cps) * USEC_PER_SECOND;
}
static vlib_node_registration_t bfd_process_node;
u8 *
format_bfd_auth_key (u8 * s, va_list * args)
{
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
* 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->remote_discr = 0;
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
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);
}
}
const char *
bfd_poll_state_string (bfd_poll_state_e state)
{
switch (state)
{
#define F(x) \
case BFD_POLL_##x: \
return "BFD_POLL_" #x;
foreach_bfd_poll_state (F)
#undef F
}
return "UNKNOWN";
}
static void
bfd_set_poll_state (bfd_session_t * bs, bfd_poll_state_e state)
{
if (bs->poll_state != state)
{
BFD_DBG ("Setting poll state=%s, bs_idx=%u",
bfd_poll_state_string (state), bs->bs_idx);
bs->poll_state = state;
}
}
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_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)
{
/*
* 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
{
/* 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)
{
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_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_state == BFD_STATE_init || bs->local_state == BFD_STATE_up)
{
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);
}
}
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;
u64 tx_timeout = 0;
if (BFD_STATE_up == bs->local_state)
{
rx_timeout = bs->last_rx_clocks + bs->detection_time_clocks;
}
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 (tx_timeout, rx_timeout);
}
else if (tx_timeout)
{
next = tx_timeout;
}
else if (rx_timeout)
{
next = rx_timeout;
}
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);",
&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);
bfd_lock (bm);
timing_wheel_insert (&bm->wheel, bs->wheel_time_clocks, bs->bs_idx);
if (!handling_wakeup)
{
/* 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_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);
}
static void
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);
}
static void
bfd_set_remote_required_min_rx (bfd_main_t * bm, bfd_session_t * bs,
u64 now, u32 remote_required_min_rx_usec)
{
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);
}
}
static void
bfd_notify_listeners (bfd_main_t * bm,
bfd_listen_event_e event, const bfd_session_t * bs)
{
bfd_notify_fn_t *fn;
vec_foreach (fn, bm->listeners)
{
(*fn) (event, bs);
}
}
void
bfd_session_start (bfd_main_t * bm, bfd_session_t * bs)
{
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);
}
void
bfd_session_set_flags (bfd_session_t * bs, u8 admin_up_down)
{
bfd_main_t *bm = &bfd_main;
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_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);
}
}
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",
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",
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 ("\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:
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:
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:
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_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, u32 bi, bfd_session_t * bs)
{
switch (bs->transport)
{
case BFD_TRANSPORT_UDP4:
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 udp6, bs_idx=%u", bs->bs_idx);
bfd_add_udp6_transport (vm, bi, bs, 0 /* is_echo */ );
break;
}
}
static int
bfd_transport_control_frame (vlib_main_t * vm, u32 bi, bfd_session_t * bs)
{
switch (bs->transport)
{
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;
}
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;
}
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;
}
#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
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
}
}
}
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 (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);
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);
pkt->head.detect_mult = bs->local_detect_mult;
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->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_echo (vlib_main_t * vm, vlib_node_runtime_t * rt,
bfd_main_t * bm, bfd_session_t * bs, u64 now)
{
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)
{
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_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
{
BFD_DBG
("No need to send control frame now, now is %lu, tx_timeout is %lu",
now, bs->tx_timeout_clocks);
}
}
void
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 (bm, bs, b);
bfd_pkt_set_final (vlib_buffer_get_current (b));
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
*/
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);
/*
* 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);
}
}
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_send_periodic (vm, rt, bm, bs, now);
break;
case BFD_STATE_down:
bfd_send_periodic (vm, rt, bm, bs, now);
break;
case BFD_STATE_init:
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);
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;
}
}
/*
* 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 ();
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");
(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 ();
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:
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:
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;
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);
bfd_set_timer (bm, bs, now, 1);
}
}
bfd_unlock (bm);
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 = 0,
.next_nodes = {},
};
/* *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);
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 ();
clib_memset (&bm->wheel, 0, sizeof (bm->wheel));
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_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_e t)
{
bfd_session_t *result;
bfd_lock (bm);
pool_get (bm->sessions, result);
clib_memset (result, 0, sizeof (*result));
result->bs_idx = result - bm->sessions;
result->transport = t;
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);
}
return NULL;
}
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)
{
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_common_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;
}
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
*
* @param pkt
*
* @return 1 if bfd packet is valid
*/
int
bfd_verify_pkt_auth (const bfd_pkt_t * pkt, u16 pkt_size, bfd_session_t * bs)
{
if (bfd_pkt_get_auth_present (pkt))
{
/* authentication present in packet */
if (!bs->auth.curr_key)
{
/* 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
{
/* authentication in packet not present */
if (pkt_size > sizeof (*pkt))
{
BFD_ERR ("BFD verification failed - unexpected packet size '%d' "
"(auth not present)", pkt_size);
return 0;
}
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 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 || (pkt->your_disc && pkt->your_disc != bs->local_discr))
{
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);
bs->remote_diag = bfd_pkt_get_diag_code (pkt);
u64 now = clib_cpu_time_now ();
bs->last_rx_clocks = now;
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));
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)
{
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);
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_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);
}
}
else if (BFD_STATE_init == bs->local_state)
{
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);
}
}
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);
}
}
}
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 *);
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;
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/