From ae605389253805e07bb293b056e012cdaf5593b2 Mon Sep 17 00:00:00 2001 From: Alexander Chernavin Date: Wed, 17 Aug 2022 08:30:43 +0000 Subject: wireguard: fix fib entry tracking Type: fix After peers roaming support addition, FIB entry tracking stopped working. For example, it can be observed when an adjacency is stacked on a FIB entry by the plugin and the FIB entry hasn't got ARP resolution yet. Once the FIB entry gets ARP resolution, the adjacency is not re-stacked as it used to. This results in endless ARP requests when a traffic is sent via the adjacency. This is broken because the plugin stopped using "midchain delegate" with peers roaming support addition. The reason is that "midchain delegate" didn't support stacking on a different FIB entry which is needed when peer's endpoint changes. Now it is supported there (added in 36892). With this fix, start using "midchane delegate" again and thus, fix FIB entry tracking. Also, cover this in tests. Signed-off-by: Alexander Chernavin Change-Id: Iea91f38739ab129e601fd6567b52565dbd649371 --- src/plugins/wireguard/wireguard_peer.c | 79 +++++++++++++++------------------- 1 file changed, 34 insertions(+), 45 deletions(-) (limited to 'src/plugins/wireguard/wireguard_peer.c') diff --git a/src/plugins/wireguard/wireguard_peer.c b/src/plugins/wireguard/wireguard_peer.c index 922ca8cdae5..b22110af8f6 100644 --- a/src/plugins/wireguard/wireguard_peer.c +++ b/src/plugins/wireguard/wireguard_peer.c @@ -16,7 +16,6 @@ #include #include -#include #include #include #include @@ -64,14 +63,13 @@ wg_peer_clear (vlib_main_t * vm, wg_peer_t * peer) wg_peer_endpoint_reset (&peer->src); wg_peer_endpoint_reset (&peer->dst); - wg_peer_adj_t *peer_adj; - vec_foreach (peer_adj, peer->adjs) + adj_index_t *adj_index; + vec_foreach (adj_index, peer->adj_indices) { - wg_peer_by_adj_index[peer_adj->adj_index] = INDEX_INVALID; - if (FIB_NODE_INDEX_INVALID != peer_adj->fib_entry_index) - fib_entry_untrack (peer_adj->fib_entry_index, peer_adj->sibling_index); - if (adj_is_valid (peer_adj->adj_index)) - adj_nbr_midchain_unstack (peer_adj->adj_index); + wg_peer_by_adj_index[*adj_index] = INDEX_INVALID; + + if (adj_is_valid (*adj_index)) + adj_midchain_delegate_unstack (*adj_index); } peer->input_thread_index = ~0; peer->output_thread_index = ~0; @@ -87,7 +85,7 @@ wg_peer_clear (vlib_main_t * vm, wg_peer_t * peer) peer->timer_need_another_keepalive = false; vec_free (peer->rewrite); vec_free (peer->allowed_ips); - vec_free (peer->adjs); + vec_free (peer->adj_indices); } static void @@ -99,17 +97,17 @@ wg_peer_init (vlib_main_t * vm, wg_peer_t * peer) } static void -wg_peer_adj_stack (wg_peer_t *peer, wg_peer_adj_t *peer_adj) +wg_peer_adj_stack (wg_peer_t *peer, adj_index_t ai) { ip_adjacency_t *adj; u32 sw_if_index; wg_if_t *wgi; fib_protocol_t fib_proto; - if (!adj_is_valid (peer_adj->adj_index)) + if (!adj_is_valid (ai)) return; - adj = adj_get (peer_adj->adj_index); + adj = adj_get (ai); sw_if_index = adj->rewrite_header.sw_if_index; u8 is_ip4 = ip46_address_is_ip4 (&peer->src.addr); fib_proto = is_ip4 ? FIB_PROTOCOL_IP4 : FIB_PROTOCOL_IP6; @@ -122,7 +120,7 @@ wg_peer_adj_stack (wg_peer_t *peer, wg_peer_adj_t *peer_adj) if (!vnet_sw_interface_is_admin_up (vnet_get_main (), wgi->sw_if_index) || !wg_peer_can_send (peer)) { - adj_nbr_midchain_unstack (peer_adj->adj_index); + adj_midchain_delegate_unstack (ai); } else { @@ -136,16 +134,17 @@ wg_peer_adj_stack (wg_peer_t *peer, wg_peer_adj_t *peer_adj) u32 fib_index; fib_index = fib_table_find (fib_proto, peer->table_id); - peer_adj->fib_entry_index = - fib_entry_track (fib_index, &dst, FIB_NODE_TYPE_ADJ, - peer_adj->adj_index, &peer_adj->sibling_index); - adj_nbr_midchain_stack_on_fib_entry ( - peer_adj->adj_index, peer_adj->fib_entry_index, - fib_forw_chain_type_from_fib_proto (dst.fp_proto)); + adj_midchain_delegate_stack (ai, fib_index, &dst); } } +static void +wg_peer_adj_reset_stacking (adj_index_t ai) +{ + adj_midchain_delegate_remove (ai); +} + static void wg_peer_66_fixup (vlib_main_t *vm, const ip_adjacency_t *adj, vlib_buffer_t *b, const void *data) @@ -207,11 +206,11 @@ walk_rc_t wg_peer_if_admin_state_change (index_t peeri, void *data) { wg_peer_t *peer; - wg_peer_adj_t *peer_adj; + adj_index_t *adj_index; peer = wg_peer_get (peeri); - vec_foreach (peer_adj, peer->adjs) + vec_foreach (adj_index, peer->adj_indices) { - wg_peer_adj_stack (peer, peer_adj); + wg_peer_adj_stack (peer, *adj_index); } return (WALK_CONTINUE); } @@ -224,7 +223,6 @@ wg_peer_if_adj_change (index_t peeri, void *data) ip_adjacency_t *adj; wg_peer_t *peer; fib_prefix_t *allowed_ip; - wg_peer_adj_t *peer_adj; adj = adj_get (*adj_index); @@ -234,10 +232,7 @@ wg_peer_if_adj_change (index_t peeri, void *data) if (fib_prefix_is_cover_addr_46 (allowed_ip, &adj->sub_type.nbr.next_hop)) { - vec_add2 (peer->adjs, peer_adj, 1); - peer_adj->adj_index = *adj_index; - peer_adj->fib_entry_index = FIB_NODE_INDEX_INVALID; - peer_adj->sibling_index = ~0; + vec_add1 (peer->adj_indices, *adj_index); vec_validate_init_empty (wg_peer_by_adj_index, *adj_index, INDEX_INVALID); @@ -248,7 +243,7 @@ wg_peer_if_adj_change (index_t peeri, void *data) ADJ_FLAG_MIDCHAIN_IP_STACK, vec_dup (peer->rewrite)); - wg_peer_adj_stack (peer, peer_adj); + wg_peer_adj_stack (peer, *adj_index); return (WALK_STOP); } } @@ -342,25 +337,19 @@ wg_peer_update_endpoint (index_t peeri, const ip46_address_t *addr, u16 port) peer->rewrite = wg_build_rewrite (&peer->src.addr, peer->src.port, &peer->dst.addr, peer->dst.port, is_ip4); - wg_peer_adj_t *peer_adj; - vec_foreach (peer_adj, peer->adjs) + adj_index_t *adj_index; + vec_foreach (adj_index, peer->adj_indices) { - if (FIB_NODE_INDEX_INVALID != peer_adj->fib_entry_index) - { - fib_entry_untrack (peer_adj->fib_entry_index, - peer_adj->sibling_index); - peer_adj->fib_entry_index = FIB_NODE_INDEX_INVALID; - peer_adj->sibling_index = ~0; - } - - if (adj_is_valid (peer_adj->adj_index)) + if (adj_is_valid (*adj_index)) { adj_midchain_fixup_t fixup = - wg_peer_get_fixup (peer, adj_get_link_type (peer_adj->adj_index)); - adj_nbr_midchain_update_rewrite (peer_adj->adj_index, fixup, NULL, + wg_peer_get_fixup (peer, adj_get_link_type (*adj_index)); + adj_nbr_midchain_update_rewrite (*adj_index, fixup, NULL, ADJ_FLAG_MIDCHAIN_IP_STACK, vec_dup (peer->rewrite)); - wg_peer_adj_stack (peer, peer_adj); + + wg_peer_adj_reset_stacking (*adj_index); + wg_peer_adj_stack (peer, *adj_index); } } } @@ -507,9 +496,9 @@ format_wg_peer (u8 * s, va_list * va) { index_t peeri = va_arg (*va, index_t); fib_prefix_t *allowed_ip; + adj_index_t *adj_index; u8 key[NOISE_KEY_LEN_BASE64]; wg_peer_t *peer; - wg_peer_adj_t *peer_adj; peer = wg_peer_get (peeri); key_to_base64 (peer->remote.r_public, NOISE_PUBLIC_KEY_LEN, key); @@ -522,9 +511,9 @@ format_wg_peer (u8 * s, va_list * va) peer->wg_sw_if_index, peer->persistent_keepalive_interval, peer->flags, pool_elts (peer->api_clients)); s = format (s, "\n adj:"); - vec_foreach (peer_adj, peer->adjs) + vec_foreach (adj_index, peer->adj_indices) { - s = format (s, " %d", peer_adj->adj_index); + s = format (s, " %d", *adj_index); } s = format (s, "\n key:%=s %U", key, format_hex_bytes, peer->remote.r_public, NOISE_PUBLIC_KEY_LEN); -- cgit 1.2.3-korg