/* * Copyright (c) 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. */ #include <vnet/adj/adj.h> #include <vnet/adj/adj_internal.h> #include <vnet/fib/fib_walk.h> /* * The 'DB' of all glean adjs. * There is only one glean per-interface per-protocol, so this is a per-interface * vector */ static adj_index_t *adj_gleans[FIB_PROTOCOL_MAX]; static inline u32 adj_get_glean_node (fib_protocol_t proto) { switch (proto) { case FIB_PROTOCOL_IP4: return (ip4_glean_node.index); case FIB_PROTOCOL_IP6: return (ip6_glean_node.index); case FIB_PROTOCOL_MPLS: break; } ASSERT(0); return (~0); } /* * adj_glean_add_or_lock * * The next_hop address here is used for source address selection in the DP. * The glean adj is added to an interface's connected prefix, the next-hop * passed here is the local prefix on the same interface. */ adj_index_t adj_glean_add_or_lock (fib_protocol_t proto, vnet_link_t linkt, u32 sw_if_index, const ip46_address_t *nh_addr) { ip_adjacency_t * adj; vec_validate_init_empty(adj_gleans[proto], sw_if_index, ADJ_INDEX_INVALID); if (ADJ_INDEX_INVALID == adj_gleans[proto][sw_if_index]) { adj = adj_alloc(proto); adj->lookup_next_index = IP_LOOKUP_NEXT_GLEAN; adj->ia_nh_proto = proto; adj->ia_link = linkt; adj->ia_node_index = adj_get_glean_node(proto); adj_gleans[proto][sw_if_index] = adj_get_index(adj); if (NULL != nh_addr) { adj->sub_type.glean.receive_addr = *nh_addr; } else { adj->sub_type.glean.receive_addr = zero_addr; } adj->rewrite_header.sw_if_index = sw_if_index; adj->rewrite_header.data_bytes = 0; adj->rewrite_header.max_l3_packet_bytes = vnet_sw_interface_get_mtu(vnet_get_main(), sw_if_index, vnet_link_to_mtu(linkt)); adj_lock(adj_get_index(adj)); vnet_update_adjacency_for_sw_interface(vnet_get_main(), sw_if_index, adj_get_index(adj)); } else { adj = adj_get(adj_gleans[proto][sw_if_index]); adj_lock(adj_get_index(adj)); } adj_delegate_adj_created(adj); return (adj_get_index(adj)); } /** * adj_glean_update_rewrite */ void adj_glean_update_rewrite (adj_index_t adj_index) { ip_adjacency_t *adj; ASSERT(ADJ_INDEX_INVALID != adj_index); adj = adj_get(adj_index); vnet_rewrite_for_sw_interface(vnet_get_main(), adj_fib_proto_2_nd(adj->ia_nh_proto), adj->rewrite_header.sw_if_index, adj->ia_node_index, VNET_REWRITE_FOR_SW_INTERFACE_ADDRESS_BROADCAST, &adj->rewrite_header, sizeof (adj->rewrite_data)); } adj_index_t adj_glean_get (fib_protocol_t proto, u32 sw_if_index) { if (sw_if_index < vec_len(adj_gleans[proto])) { return (adj_gleans[proto][sw_if_index]); } return (ADJ_INDEX_INVALID); } void adj_glean_remove (fib_protocol_t proto, u32 sw_if_index) { ASSERT(sw_if_index < vec_len(adj_gleans[proto])); adj_gleans[proto][sw_if_index] = ADJ_INDEX_INVALID; } static clib_error_t * adj_glean_interface_state_change (vnet_main_t * vnm, u32 sw_if_index, u32 flags) { /* * for each glean on the interface trigger a walk back to the children */ fib_protocol_t proto; ip_adjacency_t *adj; FOR_EACH_FIB_IP_PROTOCOL(proto) { if (sw_if_index >= vec_len(adj_gleans[proto]) || ADJ_INDEX_INVALID == adj_gleans[proto][sw_if_index]) continue; adj = adj_get(adj_gleans[proto][sw_if_index]); fib_node_back_walk_ctx_t bw_ctx = { .fnbw_reason = (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP ? FIB_NODE_BW_REASON_FLAG_INTERFACE_UP : FIB_NODE_BW_REASON_FLAG_INTERFACE_DOWN), }; fib_walk_sync(FIB_NODE_TYPE_ADJ, adj_get_index(adj), &bw_ctx); } return (NULL); } VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION(adj_glean_interface_state_change); /** * @brief Invoked on each SW interface of a HW interface when the * HW interface state changes */ static walk_rc_t adj_nbr_hw_sw_interface_state_change (vnet_main_t * vnm, u32 sw_if_index, void *arg) { adj_glean_interface_state_change(vnm, sw_if_index, (uword) arg); return (WALK_CONTINUE); } /** * @brief Registered callback for HW interface state changes */ static clib_error_t * adj_glean_hw_interface_state_change (vnet_main_t * vnm, u32 hw_if_index, u32 flags) { /* * walk SW interfaces on the HW */ uword sw_flags; sw_flags = ((flags & VNET_HW_INTERFACE_FLAG_LINK_UP) ? VNET_SW_INTERFACE_FLAG_ADMIN_UP : 0); vnet_hw_interface_walk_sw(vnm, hw_if_index, adj_nbr_hw_sw_interface_state_change, (void*) sw_flags); return (NULL); } VNET_HW_INTERFACE_LINK_UP_DOWN_FUNCTION( adj_glean_hw_interface_state_change); static clib_error_t * adj_glean_interface_delete (vnet_main_t * vnm, u32 sw_if_index, u32 is_add) { /* * for each glean on the interface trigger a walk back to the children */ fib_protocol_t proto; ip_adjacency_t *adj; if (is_add) { /* * not interested in interface additions. we will not back walk * to resolve paths through newly added interfaces. Why? The control * plane should have the brains to add interfaces first, then routes. * So the case where there are paths with a interface that matches * one just created is the case where the path resolved through an * interface that was deleted, and still has not been removed. The * new interface added, is NO GUARANTEE that the interface being * added now, even though it may have the same sw_if_index, is the * same interface that the path needs. So tough! * If the control plane wants these routes to resolve it needs to * remove and add them again. */ return (NULL); } FOR_EACH_FIB_IP_PROTOCOL(proto) { if (sw_if_index >= vec_len(adj_gleans[proto]) || ADJ_INDEX_INVALID == adj_gleans[proto][sw_if_index]) continue; adj = adj_get(adj_gleans[proto][sw_if_index]); fib_node_back_walk_ctx_t bw_ctx = { .fnbw_reason = FIB_NODE_BW_REASON_FLAG_INTERFACE_DELETE, }; fib_walk_sync(FIB_NODE_TYPE_ADJ, adj_get_index(adj), &bw_ctx); } return (NULL); } VNET_SW_INTERFACE_ADD_DEL_FUNCTION(adj_glean_interface_delete); u8* format_adj_glean (u8* s, va_list *ap) { index_t index = va_arg(*ap, index_t); CLIB_UNUSED(u32 indent) = va_arg(*ap, u32); ip_adjacency_t * adj = adj_get(index); s = format(s, "%U-glean: %U", format_fib_protocol, adj->ia_nh_proto, format_vnet_rewrite, &adj->rewrite_header, sizeof (adj->rewrite_data), 0); return (s); } static void adj_dpo_lock (dpo_id_t *dpo) { adj_lock(dpo->dpoi_index); } static void adj_dpo_unlock (dpo_id_t *dpo) { adj_unlock(dpo->dpoi_index); } const static dpo_vft_t adj_glean_dpo_vft = { .dv_lock = adj_dpo_lock, .dv_unlock = adj_dpo_unlock, .dv_format = format_adj_glean, .dv_get_urpf = adj_dpo_get_urpf, }; /** * @brief The per-protocol VLIB graph nodes that are assigned to a glean * object. * * this means that these graph nodes are ones from which a glean is the * parent object in the DPO-graph. */ const static char* const glean_ip4_nodes[] = { "ip4-glean", NULL, }; const static char* const glean_ip6_nodes[] = { "ip6-glean", NULL, }; const static char* const * const glean_nodes[DPO_PROTO_NUM] = { [DPO_PROTO_IP4] = glean_ip4_nodes, [DPO_PROTO_IP6] = glean_ip6_nodes, [DPO_PROTO_MPLS] = NULL, }; void adj_glean_module_init (void) { dpo_register(DPO_ADJACENCY_GLEAN, &adj_glean_dpo_vft, glean_nodes); }