| /* |
| * 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 one glean per-{interface, protocol, connected prefix} |
| */ |
| static uword **adj_gleans[FIB_PROTOCOL_IP_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); |
| } |
| |
| static adj_index_t |
| adj_glean_db_lookup (fib_protocol_t proto, |
| u32 sw_if_index, |
| const ip46_address_t *nh_addr) |
| { |
| uword *p; |
| |
| if (vec_len(adj_gleans[proto]) <= sw_if_index) |
| return (ADJ_INDEX_INVALID); |
| |
| p = hash_get_mem (adj_gleans[proto][sw_if_index], nh_addr); |
| |
| if (p) |
| return (p[0]); |
| |
| return (ADJ_INDEX_INVALID); |
| } |
| |
| static void |
| adj_glean_db_insert (fib_protocol_t proto, |
| u32 sw_if_index, |
| const ip46_address_t *nh_addr, |
| adj_index_t ai) |
| { |
| vlib_main_t *vm = vlib_get_main(); |
| |
| vlib_worker_thread_barrier_sync(vm); |
| |
| vec_validate(adj_gleans[proto], sw_if_index); |
| |
| if (NULL == adj_gleans[proto][sw_if_index]) |
| { |
| adj_gleans[proto][sw_if_index] = |
| hash_create_mem (0, sizeof(ip46_address_t), sizeof(adj_index_t)); |
| } |
| |
| hash_set_mem_alloc (&adj_gleans[proto][sw_if_index], |
| nh_addr, ai); |
| |
| vlib_worker_thread_barrier_release(vm); |
| } |
| |
| static void |
| adj_glean_db_remove (fib_protocol_t proto, |
| u32 sw_if_index, |
| const ip46_address_t *nh_addr) |
| { |
| vlib_main_t *vm = vlib_get_main(); |
| |
| vlib_worker_thread_barrier_sync(vm); |
| |
| ASSERT(ADJ_INDEX_INVALID != adj_glean_db_lookup(proto, sw_if_index, nh_addr)); |
| hash_unset_mem_free (&adj_gleans[proto][sw_if_index], |
| nh_addr); |
| |
| if (0 == hash_elts(adj_gleans[proto][sw_if_index])) |
| { |
| hash_free(adj_gleans[proto][sw_if_index]); |
| adj_gleans[proto][sw_if_index] = NULL; |
| } |
| vlib_worker_thread_barrier_release(vm); |
| } |
| |
| /* |
| * 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 fib_prefix_t *conn) |
| { |
| ip_adjacency_t * adj; |
| adj_index_t ai; |
| |
| ai = adj_glean_db_lookup(proto, sw_if_index, &conn->fp_addr); |
| |
| if (ADJ_INDEX_INVALID == ai) |
| { |
| 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); |
| ai = adj_get_index(adj); |
| adj_lock(ai); |
| |
| ASSERT(conn); |
| fib_prefix_normalize(conn, &adj->sub_type.glean.rx_pfx); |
| 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)); |
| |
| vnet_update_adjacency_for_sw_interface(vnet_get_main(), |
| sw_if_index, |
| ai); |
| |
| adj_glean_db_insert(proto, sw_if_index, |
| &adj->sub_type.glean.rx_pfx.fp_addr, ai); |
| } |
| else |
| { |
| adj = adj_get(ai); |
| adj_lock(ai); |
| } |
| |
| adj_delegate_adj_created(adj); |
| |
| return (ai); |
| } |
| |
| /** |
| * 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)); |
| } |
| |
| static adj_walk_rc_t |
| adj_glean_update_rewrite_walk (adj_index_t ai, |
| void *data) |
| { |
| adj_glean_update_rewrite(ai); |
| |
| return (ADJ_WALK_RC_CONTINUE); |
| } |
| |
| void |
| adj_glean_walk (u32 sw_if_index, |
| adj_walk_cb_t cb, |
| void *data) |
| { |
| fib_protocol_t proto; |
| |
| FOR_EACH_FIB_IP_PROTOCOL(proto) |
| { |
| adj_index_t ai, *aip, *ais = NULL; |
| ip46_address_t *conn; |
| |
| if (vec_len(adj_gleans[proto]) <= sw_if_index || |
| NULL == adj_gleans[proto][sw_if_index]) |
| continue; |
| |
| /* |
| * Walk first to collect the indices |
| * then walk the collection. This is safe |
| * to modifications of the hash table |
| */ |
| hash_foreach_mem(conn, ai, adj_gleans[proto][sw_if_index], |
| ({ |
| vec_add1(ais, ai); |
| })); |
| |
| vec_foreach(aip, ais) |
| { |
| if (ADJ_WALK_RC_STOP == cb(*aip, data)) |
| break; |
| } |
| vec_free(ais); |
| } |
| } |
| |
| adj_index_t |
| adj_glean_get (fib_protocol_t proto, |
| u32 sw_if_index, |
| const ip46_address_t *nh) |
| { |
| if (NULL != nh) |
| { |
| return adj_glean_db_lookup(proto, sw_if_index, nh); |
| } |
| else |
| { |
| ip46_address_t *conn; |
| adj_index_t ai; |
| |
| if (vec_len(adj_gleans[proto]) <= sw_if_index || |
| NULL == adj_gleans[proto][sw_if_index]) |
| return (ADJ_INDEX_INVALID); |
| |
| hash_foreach_mem(conn, ai, adj_gleans[proto][sw_if_index], |
| ({ |
| return (ai); |
| })); |
| } |
| return (ADJ_INDEX_INVALID); |
| } |
| |
| const ip46_address_t * |
| adj_glean_get_src (fib_protocol_t proto, |
| u32 sw_if_index, |
| const ip46_address_t *nh) |
| { |
| const ip46_address_t *conn, *source; |
| const ip_adjacency_t *adj; |
| adj_index_t ai; |
| |
| if (vec_len(adj_gleans[proto]) <= sw_if_index || |
| NULL == adj_gleans[proto][sw_if_index]) |
| return (NULL); |
| |
| fib_prefix_t pfx = { |
| .fp_len = fib_prefix_get_host_length(proto), |
| .fp_proto = proto, |
| }; |
| |
| if (nh) |
| pfx.fp_addr = *nh; |
| |
| /* |
| * An interface can have more than one glean address. Where |
| * possible we want to return a source address from the same |
| * subnet as the destination. If this is not possible then any address |
| * will do. |
| */ |
| source = NULL; |
| |
| hash_foreach_mem(conn, ai, adj_gleans[proto][sw_if_index], |
| ({ |
| adj = adj_get(ai); |
| |
| if (adj->sub_type.glean.rx_pfx.fp_len > 0) |
| { |
| source = &adj->sub_type.glean.rx_pfx.fp_addr; |
| |
| /* if no destination is specified use the just glean */ |
| if (NULL == nh) |
| return (source); |
| |
| /* check the clean covers the desintation */ |
| if (fib_prefix_is_cover(&adj->sub_type.glean.rx_pfx, &pfx)) |
| return (source); |
| } |
| })); |
| |
| return (source); |
| } |
| |
| void |
| adj_glean_remove (ip_adjacency_t *adj) |
| { |
| fib_prefix_t norm; |
| |
| fib_prefix_normalize(&adj->sub_type.glean.rx_pfx, |
| &norm); |
| adj_glean_db_remove(adj->ia_nh_proto, |
| adj->rewrite_header.sw_if_index, |
| &norm.fp_addr); |
| } |
| |
| static adj_walk_rc_t |
| adj_glean_start_backwalk (adj_index_t ai, |
| void *data) |
| { |
| fib_node_back_walk_ctx_t bw_ctx = *(fib_node_back_walk_ctx_t*) data; |
| |
| fib_walk_sync(FIB_NODE_TYPE_ADJ, ai, &bw_ctx); |
| |
| return (ADJ_WALK_RC_CONTINUE); |
| } |
| |
| 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_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), |
| }; |
| |
| adj_glean_walk (sw_if_index, adj_glean_start_backwalk, &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) |
| { |
| 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 glean on the interface trigger a walk back to the children |
| */ |
| fib_node_back_walk_ctx_t bw_ctx = { |
| .fnbw_reason = FIB_NODE_BW_REASON_FLAG_INTERFACE_DELETE, |
| }; |
| |
| adj_glean_walk (sw_if_index, adj_glean_start_backwalk, &bw_ctx); |
| |
| return (NULL); |
| } |
| |
| VNET_SW_INTERFACE_ADD_DEL_FUNCTION(adj_glean_interface_delete); |
| |
| /** |
| * Callback function invoked when an interface's MAC Address changes |
| */ |
| static void |
| adj_glean_ethernet_change_mac (ethernet_main_t * em, |
| u32 sw_if_index, |
| uword opaque) |
| { |
| adj_glean_walk (sw_if_index, adj_glean_update_rewrite_walk, NULL); |
| } |
| |
| static void |
| adj_glean_table_bind (fib_protocol_t fproto, |
| u32 sw_if_index, |
| u32 itf_fib_index) |
| { |
| /* |
| * for each glean on the interface trigger a walk back to the children |
| */ |
| fib_node_back_walk_ctx_t bw_ctx = { |
| .fnbw_reason = FIB_NODE_BW_REASON_FLAG_INTERFACE_BIND, |
| .interface_bind = { |
| .fnbw_to_fib_index = itf_fib_index, |
| }, |
| }; |
| |
| adj_glean_walk (sw_if_index, adj_glean_start_backwalk, &bw_ctx); |
| } |
| |
| |
| /** |
| * Callback function invoked when an interface's IPv6 Table |
| * binding changes |
| */ |
| static void |
| adj_glean_ip6_table_bind (ip6_main_t * im, |
| uword opaque, |
| u32 sw_if_index, |
| u32 new_fib_index, |
| u32 old_fib_index) |
| { |
| adj_glean_table_bind (FIB_PROTOCOL_IP6, sw_if_index, new_fib_index); |
| } |
| |
| /** |
| * Callback function invoked when an interface's IPv4 Table |
| * binding changes |
| */ |
| static void |
| adj_glean_ip4_table_bind (ip4_main_t * im, |
| uword opaque, |
| u32 sw_if_index, |
| u32 new_fib_index, |
| u32 old_fib_index) |
| { |
| adj_glean_table_bind (FIB_PROTOCOL_IP4, sw_if_index, new_fib_index); |
| } |
| |
| 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: [src:%U] %U", |
| format_fib_protocol, adj->ia_nh_proto, |
| format_fib_prefix, &adj->sub_type.glean.rx_pfx, |
| format_vnet_rewrite, |
| &adj->rewrite_header, sizeof (adj->rewrite_data), 0); |
| |
| return (s); |
| } |
| |
| u32 |
| adj_glean_db_size (void) |
| { |
| fib_protocol_t proto; |
| u32 sw_if_index = 0; |
| u64 count = 0; |
| |
| FOR_EACH_FIB_IP_PROTOCOL(proto) |
| { |
| vec_foreach_index(sw_if_index, adj_gleans[proto]) |
| { |
| if (NULL != adj_gleans[proto][sw_if_index]) |
| { |
| count += hash_elts(adj_gleans[proto][sw_if_index]); |
| } |
| } |
| } |
| return (count); |
| } |
| |
| 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, |
| .dv_get_mtu = adj_dpo_get_mtu, |
| }; |
| |
| /** |
| * @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); |
| |
| ethernet_address_change_ctx_t ctx = { |
| .function = adj_glean_ethernet_change_mac, |
| .function_opaque = 0, |
| }; |
| vec_add1 (ethernet_main.address_change_callbacks, ctx); |
| |
| ip6_table_bind_callback_t cbt6 = { |
| .function = adj_glean_ip6_table_bind, |
| }; |
| vec_add1 (ip6_main.table_bind_callbacks, cbt6); |
| |
| ip4_table_bind_callback_t cbt4 = { |
| .function = adj_glean_ip4_table_bind, |
| }; |
| vec_add1 (ip4_main.table_bind_callbacks, cbt4); |
| } |