/* * 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. */ #ifndef __FIB_ENTRY_H__ #define __FIB_ENTRY_H__ #include #include #include #include #include /** * The different sources that can create a route. * The sources are defined here the thier relative priority order. * The lower the value the higher the priority */ typedef enum fib_source_t_ { /** * Marker. Add new values after this one. */ FIB_SOURCE_FIRST, /** * Special sources. These are for entries that are added to all * FIBs by default, and should never be over-ridden (hence they * are the highest priority) */ FIB_SOURCE_SPECIAL = FIB_SOURCE_FIRST, /** * Classify. A route that links directly to a classify adj */ FIB_SOURCE_CLASSIFY, /** * A route the is being 'proxied' on behalf of another device */ FIB_SOURCE_PROXY, /** * Route added as a result of interface configuration. * this will also come from the API/CLI, but the distinction is * that is from confiiguration on an interface, not a 'ip route' command */ FIB_SOURCE_INTERFACE, /** * SRv6 and SR-MPLS */ FIB_SOURCE_SR, /** * A high priority source a plugin can use */ FIB_SOURCE_PLUGIN_HI, /** * From the BIER subsystem */ FIB_SOURCE_BIER, /** * From the control plane API */ FIB_SOURCE_API, /** * From the CLI. */ FIB_SOURCE_CLI, /** * LISP */ FIB_SOURCE_LISP, /** * IPv[46] Mapping */ FIB_SOURCE_MAP, /** * SIXRD */ FIB_SOURCE_SIXRD, /** * DHCP */ FIB_SOURCE_DHCP, /** * IPv6 Proxy ND */ FIB_SOURCE_IP6_ND_PROXY, /** * Adjacency source. * routes created as a result of ARP/ND entries. This is lower priority * then the API/CLI. This is on purpose. trust me. */ FIB_SOURCE_ADJ, /** * MPLS label. The prefix has been assigned a local label. This source * never provides forwarding information, instead it acts as a place-holder * so the association of label to prefix can be maintained */ FIB_SOURCE_MPLS, /** * Attached Export source. * routes created as a result of attahced export. routes thus sourced * will be present in the export tables */ FIB_SOURCE_AE, /** * Recursive resolution source. * Used to install an entry that is the resolution traget of another. */ FIB_SOURCE_RR, /** * uRPF bypass/exemption. * Used to install an entry that is exempt from the loose uRPF check */ FIB_SOURCE_URPF_EXEMPT, /** * The default route source. * The default route is always added to the FIB table (like the * special sources) but we need to be able to over-ride it with * 'ip route' sources when provided */ FIB_SOURCE_DEFAULT_ROUTE, /** * Marker. add new entries before this one. */ FIB_SOURCE_LAST = FIB_SOURCE_DEFAULT_ROUTE, } __attribute__ ((packed)) fib_source_t; STATIC_ASSERT (sizeof(fib_source_t) == 1, "FIB too many sources"); /** * The maximum number of sources */ #define FIB_SOURCE_MAX (FIB_SOURCE_LAST+1) #define FIB_SOURCES { \ [FIB_SOURCE_SPECIAL] = "special", \ [FIB_SOURCE_INTERFACE] = "interface", \ [FIB_SOURCE_PROXY] = "proxy", \ [FIB_SOURCE_BIER] = "BIER", \ [FIB_SOURCE_API] = "API", \ [FIB_SOURCE_CLI] = "CLI", \ [FIB_SOURCE_ADJ] = "adjacency", \ [FIB_SOURCE_MAP] = "MAP", \ [FIB_SOURCE_SR] = "SR", \ [FIB_SOURCE_SIXRD] = "SixRD", \ [FIB_SOURCE_LISP] = "LISP", \ [FIB_SOURCE_CLASSIFY] = "classify", \ [FIB_SOURCE_DHCP] = "DHCP", \ [FIB_SOURCE_IP6_ND_PROXY] = "IPv6-proxy-nd", \ [FIB_SOURCE_RR] = "recursive-resolution", \ [FIB_SOURCE_AE] = "attached_export", \ [FIB_SOURCE_MPLS] = "mpls", \ [FIB_SOURCE_URPF_EXEMPT] = "urpf-exempt", \ [FIB_SOURCE_DEFAULT_ROUTE] = "default-route", \ } #define FOR_EACH_FIB_SOURCE(_item) \ for (_item = FIB_SOURCE_FIRST; _item < FIB_SOURCE_MAX; _item++) /** * The different sources that can create a route. * The sources are defined here the thier relative priority order. * The lower the value the higher the priority */ typedef enum fib_entry_attribute_t_ { /** * Marker. Add new values after this one. */ FIB_ENTRY_ATTRIBUTE_FIRST, /** * Connected. The prefix is configured on an interface. */ FIB_ENTRY_ATTRIBUTE_CONNECTED = FIB_ENTRY_ATTRIBUTE_FIRST, /** * Attached. The prefix is attached to an interface. */ FIB_ENTRY_ATTRIBUTE_ATTACHED, /** * The route is an explicit drop. */ FIB_ENTRY_ATTRIBUTE_DROP, /** * The route is exclusive. The client creating the route is * providing an exclusive adjacency. */ FIB_ENTRY_ATTRIBUTE_EXCLUSIVE, /** * The route is attached cross tables and thus imports covered * prefixes from the other table. */ FIB_ENTRY_ATTRIBUTE_IMPORT, /** * The prefix/address is local to this device */ FIB_ENTRY_ATTRIBUTE_LOCAL, /** * The prefix/address is a multicast prefix. * this aplies only to MPLS. IP multicast is handled by mfib */ FIB_ENTRY_ATTRIBUTE_MULTICAST, /** * The prefix/address exempted from loose uRPF check * To be used with caution */ FIB_ENTRY_ATTRIBUTE_URPF_EXEMPT, /** * This FIB entry imposes its source information on all prefixes * that is covers */ FIB_ENTRY_ATTRIBUTE_COVERED_INHERIT, /** * Marker. add new entries before this one. */ FIB_ENTRY_ATTRIBUTE_LAST = FIB_ENTRY_ATTRIBUTE_COVERED_INHERIT, } fib_entry_attribute_t; #define FIB_ENTRY_ATTRIBUTES { \ [FIB_ENTRY_ATTRIBUTE_CONNECTED] = "connected", \ [FIB_ENTRY_ATTRIBUTE_ATTACHED] = "attached", \ [FIB_ENTRY_ATTRIBUTE_IMPORT] = "import", \ [FIB_ENTRY_ATTRIBUTE_DROP] = "drop", \ [FIB_ENTRY_ATTRIBUTE_EXCLUSIVE] = "exclusive", \ [FIB_ENTRY_ATTRIBUTE_LOCAL] = "local", \ [FIB_ENTRY_ATTRIBUTE_URPF_EXEMPT] = "uRPF-exempt", \ [FIB_ENTRY_ATTRIBUTE_MULTICAST] = "multicast", \ [FIB_ENTRY_ATTRIBUTE_COVERED_INHERIT] = "covered-inherit", \ } #define FOR_EACH_FIB_ATTRIBUTE(_item) \ for (_item = FIB_ENTRY_ATTRIBUTE_FIRST; \ _item <= FIB_ENTRY_ATTRIBUTE_LAST; \ _item++) typedef enum fib_entry_flag_t_ { FIB_ENTRY_FLAG_NONE = 0, FIB_ENTRY_FLAG_CONNECTED = (1 << FIB_ENTRY_ATTRIBUTE_CONNECTED), FIB_ENTRY_FLAG_ATTACHED = (1 << FIB_ENTRY_ATTRIBUTE_ATTACHED), FIB_ENTRY_FLAG_DROP = (1 << FIB_ENTRY_ATTRIBUTE_DROP), FIB_ENTRY_FLAG_EXCLUSIVE = (1 << FIB_ENTRY_ATTRIBUTE_EXCLUSIVE), FIB_ENTRY_FLAG_LOCAL = (1 << FIB_ENTRY_ATTRIBUTE_LOCAL), FIB_ENTRY_FLAG_IMPORT = (1 << FIB_ENTRY_ATTRIBUTE_IMPORT), FIB_ENTRY_FLAG_LOOSE_URPF_EXEMPT = (1 << FIB_ENTRY_ATTRIBUTE_URPF_EXEMPT), FIB_ENTRY_FLAG_MULTICAST = (1 << FIB_ENTRY_ATTRIBUTE_MULTICAST), FIB_ENTRY_FLAG_COVERED_INHERIT = (1 << FIB_ENTRY_ATTRIBUTE_COVERED_INHERIT), } __attribute__((packed)) fib_entry_flag_t; /** * Flags for the source data */ typedef enum fib_entry_src_attribute_t_ { /** * Marker. Add new values after this one. */ FIB_ENTRY_SRC_ATTRIBUTE_FIRST, /** * the source has been added to the entry */ FIB_ENTRY_SRC_ATTRIBUTE_ADDED = FIB_ENTRY_SRC_ATTRIBUTE_FIRST, /** * the source is active/best */ FIB_ENTRY_SRC_ATTRIBUTE_ACTIVE, /** * the source is inherited from its cover */ FIB_ENTRY_SRC_ATTRIBUTE_INHERITED, /** * Marker. add new entries before this one. */ FIB_ENTRY_SRC_ATTRIBUTE_LAST = FIB_ENTRY_SRC_ATTRIBUTE_INHERITED, } fib_entry_src_attribute_t; #define FIB_ENTRY_SRC_ATTRIBUTE_MAX (FIB_ENTRY_SRC_ATTRIBUTE_LAST+1) #define FIB_ENTRY_SRC_ATTRIBUTES { \ [FIB_ENTRY_SRC_ATTRIBUTE_ADDED] = "added", \ [FIB_ENTRY_SRC_ATTRIBUTE_ACTIVE] = "active", \ [FIB_ENTRY_SRC_ATTRIBUTE_INHERITED] = "inherited", \ } #define FOR_EACH_FIB_SRC_ATTRIBUTE(_item) \ for (_item = FIB_ENTRY_SRC_ATTRIBUTE_FIRST; \ _item < FIB_ENTRY_SRC_ATTRIBUTE_MAX; \ _item++) typedef enum fib_entry_src_flag_t_ { FIB_ENTRY_SRC_FLAG_NONE = 0, FIB_ENTRY_SRC_FLAG_ADDED = (1 << FIB_ENTRY_SRC_ATTRIBUTE_ADDED), FIB_ENTRY_SRC_FLAG_ACTIVE = (1 << FIB_ENTRY_SRC_ATTRIBUTE_ACTIVE), FIB_ENTRY_SRC_FLAG_INHERITED = (1 << FIB_ENTRY_SRC_ATTRIBUTE_INHERITED), } __attribute__ ((packed)) fib_entry_src_flag_t; /* * Keep the size of the flags field to 2 bytes, so it * can be placed next to the 2 bytes reference count */ STATIC_ASSERT (sizeof(fib_entry_src_flag_t) <= 2, "FIB entry flags field size too big"); /** * Information related to the source of a FIB entry */ typedef struct fib_entry_src_t_ { /** * A vector of path extensions */ fib_path_ext_list_t fes_path_exts; /** * The path-list created by the source */ fib_node_index_t fes_pl; /** * Which source this info block is for */ fib_source_t fes_src; /** * Flags on the source */ fib_entry_src_flag_t fes_flags; /** * 1 bytes ref count. This is not the number of users of the Entry * (which is itself not large, due to path-list sharing), but the number * of times a given source has been added. Which is even fewer */ u8 fes_ref_count; /** * Flags the source contributes to the entry */ fib_entry_flag_t fes_entry_flags; /** * Source specific info */ union { struct { /** * the index of the FIB entry that is the covering entry */ fib_node_index_t fesr_cover; /** * This source's index in the cover's list */ u32 fesr_sibling; } rr; struct { /** * the index of the FIB entry that is the covering entry */ fib_node_index_t fesa_cover; /** * This source's index in the cover's list */ u32 fesa_sibling; } adj; struct { /** * the index of the FIB entry that is the covering entry */ fib_node_index_t fesi_cover; /** * This source's index in the cover's list */ u32 fesi_sibling; } interface; struct { /** * This MPLS local label associated with the prefix. */ mpls_label_t fesm_label; /** * the indicies of the LFIB entries created */ fib_node_index_t fesm_lfes[2]; } mpls; struct { /** * The source FIB index. */ fib_node_index_t fesl_fib_index; } lisp; }; } fib_entry_src_t; /** * An entry in a FIB table. * * This entry represents a route added to the FIB that is stored * in one of the FIB tables. */ typedef struct fib_entry_t_ { /** * Base class. The entry's node representation in the graph. */ fib_node_t fe_node; /** * The prefix of the route. this is const just to be sure. * It is the entry's key/identity and so should never change. */ const fib_prefix_t fe_prefix; /** * The index of the FIB table this entry is in */ u32 fe_fib_index; /** * The load-balance used for forwarding. * * We don't share the EOS and non-EOS even in case when they could be * because: * - complexity & reliability v. memory * determining the conditions where sharing is possible is non-trivial. * - separate LBs means we can get the EOS bit right in the MPLS label DPO * and so save a few clock cycles in the DP imposition node since we can * paint the header straight on without the need to check the packet * type to derive the EOS bit value. */ dpo_id_t fe_lb; /** * Vector of source infos. * Most entries will only have 1 source. So we optimise for memory usage, * which is preferable since we have many entries. */ fib_entry_src_t *fe_srcs; /** * the path-list for which this entry is a child. This is also the path-list * that is contributing forwarding for this entry. */ fib_node_index_t fe_parent; /** * index of this entry in the parent's child list. * This is set when this entry is added as a child, but can also * be changed by the parent as it manages its list. */ u32 fe_sibling; /** * A vector of delegates. */ fib_entry_delegate_t *fe_delegates; } fib_entry_t; #define FOR_EACH_FIB_ENTRY_FLAG(_item) \ for (_item = FIB_ENTRY_FLAG_FIRST; _item < FIB_ENTRY_FLAG_MAX; _item++) #define FIB_ENTRY_FORMAT_BRIEF (0x0) #define FIB_ENTRY_FORMAT_DETAIL (0x1) #define FIB_ENTRY_FORMAT_DETAIL2 (0x2) extern u8 *format_fib_entry (u8 * s, va_list * args); extern u8 *format_fib_source (u8 * s, va_list * args); extern fib_node_index_t fib_entry_create_special(u32 fib_index, const fib_prefix_t *prefix, fib_source_t source, fib_entry_flag_t flags, const dpo_id_t *dpo); extern fib_node_index_t fib_entry_create (u32 fib_index, const fib_prefix_t *prefix, fib_source_t source, fib_entry_flag_t flags, const fib_route_path_t *paths); extern void fib_entry_update (fib_node_index_t fib_entry_index, fib_source_t source, fib_entry_flag_t flags, const fib_route_path_t *paths); extern void fib_entry_path_add(fib_node_index_t fib_entry_index, fib_source_t source, fib_entry_flag_t flags, const fib_route_path_t *rpath); extern void fib_entry_special_add(fib_node_index_t fib_entry_index, fib_source_t source, fib_entry_flag_t flags, const dpo_id_t *dpo); extern void fib_entry_special_update(fib_node_index_t fib_entry_index, fib_source_t source, fib_entry_flag_t flags, const dpo_id_t *dpo); extern fib_entry_src_flag_t fib_entry_special_remove(fib_node_index_t fib_entry_index, fib_source_t source); extern fib_entry_src_flag_t fib_entry_path_remove(fib_node_index_t fib_entry_index, fib_source_t source, const fib_route_path_t *rpath); extern void fib_entry_inherit(fib_node_index_t cover, fib_node_index_t covered); extern fib_entry_src_flag_t fib_e