diff options
author | 2017-04-04 16:19:48 +0200 | |
---|---|---|
committer | 2017-04-05 20:10:40 +0000 | |
commit | e50e8568c160f51cc2a268b59e209d13cb7344be (patch) | |
tree | 173ca3677f9765fbba640c666065bd3d8c30c692 /src/vnet/bfd/bfd_main.c | |
parent | cbbd08e1d41deae5745a83d1f941d4133e110826 (diff) |
BFD: add ARP-awareness, fix bugs
Make BFD ARP-aware when sending out packets.
Fix a few one-liner bugs discovered while integrating with cisco
nexus. Enhance CLI view to better observe session state.
Change-Id: I266c29492f351207b84328ab665d9d697969da9c
Signed-off-by: Klement Sekera <ksekera@cisco.com>
Diffstat (limited to 'src/vnet/bfd/bfd_main.c')
-rw-r--r-- | src/vnet/bfd/bfd_main.c | 136 |
1 files changed, 81 insertions, 55 deletions
diff --git a/src/vnet/bfd/bfd_main.c b/src/vnet/bfd/bfd_main.c index ea6db1f9..2b70a20c 100644 --- a/src/vnet/bfd/bfd_main.c +++ b/src/vnet/bfd/bfd_main.c @@ -63,13 +63,6 @@ bfd_clocks_to_usec (const bfd_main_t * bm, u64 clocks) static vlib_node_registration_t bfd_process_node; -/* set to 0 here, real values filled at startup */ -static u32 bfd_node_index_by_transport[] = { -#define F(t, n) [BFD_TRANSPORT_##t] = 0, - foreach_bfd_transport (F) -#undef F -}; - u8 * format_bfd_auth_key (u8 * s, va_list * args) { @@ -560,51 +553,70 @@ bfd_on_config_change (vlib_main_t * vm, vlib_node_runtime_t * rt, } static void -bfd_add_transport_layer (vlib_main_t * vm, vlib_buffer_t * b, - bfd_session_t * bs) +bfd_add_transport_layer (vlib_main_t * vm, u32 bi, bfd_session_t * bs) +{ + switch (bs->transport) + { + case BFD_TRANSPORT_UDP4: + 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); - bfd_add_udp4_transport (vm, b, bs, 0 /* is_echo */ ); + return bfd_transport_udp4 (vm, bi, bs); break; case BFD_TRANSPORT_UDP6: BFD_DBG ("Transport bfd via udp6, bs_idx=%u", bs->bs_idx); - bfd_add_udp6_transport (vm, b, bs, 0 /* is_echo */ ); + return bfd_transport_udp6 (vm, bi, bs); break; } + return 0; } static int -bfd_echo_add_transport_layer (vlib_main_t * vm, vlib_buffer_t * b, - bfd_session_t * bs) +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, b, bs, 1 /* is_echo */ ); + 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, b, bs, 1 /* is_echo */ ); + return bfd_add_udp6_transport (vm, bi, bs, 1 /* is_echo */ ); break; } return 0; } -static void -bfd_create_frame_to_next_node (vlib_main_t * vm, bfd_session_t * bs, u32 bi) +static int +bfd_transport_echo (vlib_main_t * vm, u32 bi, bfd_session_t * bs) { - - vlib_frame_t *f = - vlib_get_frame_to_node (vm, bfd_node_index_by_transport[bs->transport]); - - 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); + 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 @@ -704,7 +716,7 @@ bfd_init_control_frame (bfd_main_t * bm, bfd_session_t * bs, 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 = clib_host_to_net_u32 (bfd_length); + pkt->head.length = bfd_length; pkt->my_disc = bs->local_discr; pkt->your_disc = bs->remote_discr; pkt->des_min_tx = clib_host_to_net_u32 (bs->config_desired_min_tx_usec); @@ -725,8 +737,7 @@ bfd_init_control_frame (bfd_main_t * bm, bfd_session_t * bs, 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) + bfd_main_t * bm, bfd_session_t * bs, u64 now) { if (!bfd_is_echo_possible (bs)) { @@ -734,7 +745,8 @@ bfd_send_echo (vlib_main_t * vm, vlib_node_runtime_t * rt, bs->echo = 0; return; } - /* sometimes the wheel expires an event a bit sooner than requested, account + /* sometimes the wheel expires an event a bit sooner than requested, + account for that here */ if (now + bm->wheel_inaccuracy >= bs->echo_tx_timeout_clocks) { @@ -747,6 +759,8 @@ bfd_send_echo (vlib_main_t * vm, vlib_node_runtime_t * rt, } vlib_buffer_t *b = vlib_get_buffer (vm, bi); ASSERT (b->current_data == 0); + memset (vnet_buffer (b), 0, sizeof (*vnet_buffer (b))); + VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b); bfd_echo_pkt_t *pkt = vlib_buffer_get_current (b); memset (pkt, 0, sizeof (*pkt)); pkt->discriminator = bs->local_discr; @@ -756,7 +770,14 @@ bfd_send_echo (vlib_main_t * vm, vlib_node_runtime_t * rt, 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)) + 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; @@ -765,7 +786,6 @@ bfd_send_echo (vlib_main_t * vm, vlib_node_runtime_t * rt, } bs->echo_last_tx_clocks = now; bfd_calc_next_echo_tx (bm, bs, now); - bfd_create_frame_to_next_node (vm, bs, bi); } else { @@ -777,8 +797,7 @@ bfd_send_echo (vlib_main_t * vm, vlib_node_runtime_t * rt, static void bfd_send_periodic (vlib_main_t * vm, vlib_node_runtime_t * rt, - bfd_main_t * bm, bfd_session_t * bs, u64 now, - int handling_wakeup) + bfd_main_t * bm, bfd_session_t * bs, u64 now) { if (!bs->remote_min_rx_usec && BFD_POLL_NOT_NEEDED == bs->poll_state) { @@ -798,8 +817,10 @@ bfd_send_periodic (vlib_main_t * vm, vlib_node_runtime_t * rt, 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 */ + /* + * 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, @@ -812,6 +833,8 @@ bfd_send_periodic (vlib_main_t * vm, vlib_node_runtime_t * rt, } vlib_buffer_t *b = vlib_get_buffer (vm, bi); ASSERT (b->current_data == 0); + memset (vnet_buffer (b), 0, sizeof (*vnet_buffer (b))); + VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b); bfd_init_control_frame (bm, bs, b); switch (bs->poll_state) { @@ -837,10 +860,13 @@ bfd_send_periodic (vlib_main_t * vm, vlib_node_runtime_t * rt, break; } bfd_add_auth_section (b, bs); - bfd_add_transport_layer (vm, 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); - bfd_create_frame_to_next_node (vm, bs, bi); } else { @@ -852,13 +878,15 @@ bfd_send_periodic (vlib_main_t * vm, vlib_node_runtime_t * rt, void bfd_init_final_control_frame (vlib_main_t * vm, vlib_buffer_t * b, - bfd_main_t * bm, bfd_session_t * bs) + 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); - bfd_add_transport_layer (vm, 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 @@ -871,8 +899,10 @@ static void bfd_check_rx_timeout (bfd_main_t * bm, bfd_session_t * bs, u64 now, int handling_wakeup) { - /* sometimes the wheel expires an event a bit sooner than requested, account - for that here */ + /* + * sometimes the wheel expires an event a bit sooner than requested, account + * for that here + */ if (bs->last_rx_clocks + bs->detection_time_clocks <= now + bm->wheel_inaccuracy) { @@ -907,14 +937,14 @@ bfd_on_timeout (vlib_main_t * vm, vlib_node_runtime_t * rt, bfd_main_t * bm, switch (bs->local_state) { case BFD_STATE_admin_down: - bfd_send_periodic (vm, rt, bm, bs, now, 1); + bfd_send_periodic (vm, rt, bm, bs, now); break; case BFD_STATE_down: - bfd_send_periodic (vm, rt, bm, bs, now, 1); + bfd_send_periodic (vm, rt, bm, bs, now); break; case BFD_STATE_init: bfd_check_rx_timeout (bm, bs, now, 1); - bfd_send_periodic (vm, rt, 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); @@ -932,10 +962,10 @@ bfd_on_timeout (vlib_main_t * vm, vlib_node_runtime_t * rt, bfd_main_t * bm, bs->config_required_min_rx_clocks)); bfd_set_poll_state (bs, BFD_POLL_NEEDED); } - bfd_send_periodic (vm, rt, bm, bs, now, 1); + bfd_send_periodic (vm, rt, bm, bs, now); if (bs->echo) { - bfd_send_echo (vm, rt, bm, bs, now, 1); + bfd_send_echo (vm, rt, bm, bs, now); } break; } @@ -996,7 +1026,8 @@ 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, *event_data); - bfd_send_periodic (vm, rt, bm, bs, now, 1); + bfd_send_periodic (vm, rt, bm, bs, now); + bfd_set_timer (bm, bs, now, 1); } else { @@ -1113,14 +1144,6 @@ bfd_main_init (vlib_main_t * vm) 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; - - vlib_node_t *node = NULL; -#define F(t, n) \ - node = vlib_get_node_by_name (vm, (u8 *)n); \ - bfd_node_index_by_transport[BFD_TRANSPORT_##t] = node->index; \ - BFD_DBG ("node '%s' has index %u", n, node->index); - foreach_bfd_transport (F); -#undef F return 0; } @@ -1654,10 +1677,12 @@ bfd_consume_pkt (bfd_main_t * bm, const bfd_pkt_t * pkt, u32 bs_idx) { 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); } } @@ -1666,6 +1691,7 @@ bfd_consume_pkt (bfd_main_t * bm, const bfd_pkt_t * pkt, u32 bs_idx) 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); } } |