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Diffstat (limited to 'src/vnet/fib/fib_entry.h')
| -rw-r--r-- | src/vnet/fib/fib_entry.h | 530 |
1 files changed, 530 insertions, 0 deletions
diff --git a/src/vnet/fib/fib_entry.h b/src/vnet/fib/fib_entry.h new file mode 100644 index 00000000000..44a5f2e6d7f --- /dev/null +++ b/src/vnet/fib/fib_entry.h @@ -0,0 +1,530 @@ +/* + * 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 <vnet/fib/fib_node.h> +#include <vnet/fib/fib_entry_delegate.h> +#include <vnet/adj/adj.h> +#include <vnet/ip/ip.h> +#include <vnet/dpo/dpo.h> + +/** + * 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, + /** + * 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, + /** + * A high priority source a plugin can use + */ + FIB_SOURCE_PLUGIN_HI, + /** + * From the control plane API + */ + FIB_SOURCE_API, + /** + * From the CLI. + */ + FIB_SOURCE_CLI, + /** + * LISP + */ + FIB_SOURCE_LISP, + /** + * SRv6 + */ + FIB_SOURCE_SR, + /** + * IPv[46] Mapping + */ + FIB_SOURCE_MAP, + /** + * SIXRD + */ + FIB_SOURCE_SIXRD, + /** + * DHCP + */ + FIB_SOURCE_DHCP, + /** + * 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_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_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, + /** + * Marker. add new entries before this one. + */ + FIB_ENTRY_ATTRIBUTE_LAST = FIB_ENTRY_ATTRIBUTE_LOCAL, +} fib_entry_attribute_t; + +/** + * The maximum number of sources + */ +#define FIB_ENTRY_ATTRIBUTE_MAX (FIB_ENTRY_ATTRIBUTE_LAST+1) + +#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", \ +} + +#define FOR_EACH_FIB_ATTRIBUTE(_item) \ + for (_item = FIB_ENTRY_ATTRIBUTE_FIRST; \ + _item < FIB_ENTRY_ATTRIBUTE_MAX; \ + _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_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, + /** + * Marker. add new entries before this one. + */ + FIB_ENTRY_SRC_ATTRIBUTE_LAST = FIB_ENTRY_SRC_ATTRIBUTE_ACTIVE, +} 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", \ +} + +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), +} __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 + */ + struct fib_path_ext_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; // [FIB_FORW_CHAIN_MPLS_NUM]; + /** + * 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 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 fib_entry_src_flag_t fib_entry_delete(fib_node_index_t fib_entry_index, + fib_source_t source); + +extern void fib_entry_contribute_urpf(fib_node_index_t path_index, + index_t urpf); +extern void fib_entry_contribute_forwarding( + fib_node_index_t fib_entry_index, + fib_forward_chain_type_t type, + dpo_id_t *dpo); +extern const dpo_id_t * fib_entry_contribute_ip_forwarding( + fib_node_index_t fib_entry_index); +extern adj_index_t fib_entry_get_adj_for_source( + fib_node_index_t fib_entry_index, + fib_source_t source); +extern const int fib_entry_get_dpo_for_source ( + fib_node_index_t fib_entry_index, + fib_source_t source, + dpo_id_t *dpo); + +extern adj_index_t fib_entry_get_adj(fib_node_index_t fib_entry_index); + +extern int fib_entry_cmp_for_sort(void *i1, void *i2); + +extern void fib_entry_cover_changed(fib_node_index_t fib_entry); +extern void fib_entry_cover_updated(fib_node_index_t fib_entry); +extern int fib_entry_recursive_loop_detect(fib_node_index_t entry_index, + fib_node_index_t **entry_indicies); + +extern void fib_entry_lock(fib_node_index_t fib_entry_index); +extern void fib_entry_unlock(fib_node_index_t fib_entry_index); + +extern u32 fib_entry_child_add(fib_node_index_t fib_entry_index, + fib_node_type_t type, + fib_node_index_t child_index); +extern void fib_entry_child_remove(fib_node_index_t fib_entry_index, + u32 sibling_index); +extern u32 fib_entry_get_resolving_interface(fib_node_index_t fib_entry_index); +extern u32 fib_entry_get_resolving_interface_for_source( + fib_node_index_t fib_entry_index, + fib_source_t source); + +extern void fib_entry_encode(fib_node_index_t fib_entry_index, + fib_route_path_encode_t **api_rpaths); +extern void fib_entry_get_prefix(fib_node_index_t fib_entry_index, + fib_prefix_t *pfx); +extern u32 fib_entry_get_fib_index(fib_node_index_t fib_entry_index); +extern void fib_entry_set_source_data(fib_node_index_t fib_entry_index, + fib_source_t source, + const void *data); +extern const void* fib_entry_get_source_data(fib_node_index_t fib_entry_index, + fib_source_t source); + +extern fib_entry_flag_t fib_entry_get_flags(fib_node_index_t fib_entry_index); +extern fib_entry_flag_t fib_entry_get_flags_for_source( + fib_node_index_t fib_entry_index, + fib_source_t source); +extern fib_source_t fib_entry_get_best_source(fib_node_index_t fib_entry_index); +extern int fib_entry_is_sourced(fib_node_index_t fib_entry_index, + fib_source_t source); + +extern fib_node_index_t fib_entry_get_path_list(fib_node_index_t fib_entry_index); + +extern void fib_entry_module_init(void); + +/* + * unsafe... beware the raw pointer. + */ +extern fib_node_index_t fib_entry_get_index(const fib_entry_t * fib_entry); +extern fib_entry_t * fib_entry_get(fib_node_index_t fib_entry_index); + +/* + * for testing purposes. + */ +extern u32 fib_entry_pool_size(void); + +#endif |