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/*
* 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_SOURCE_H__
#define __FIB_SOURCE_H__
#include <vnet/vnet.h>
/**
* The different sources that can create a route.
*
* A source is a combination of two concepts; priority and behaviour.
* Priority determines whether the source is contributing forwarding.
* Behaviour determines how FIB entries with this source interact with
* other elements of FIB.
*/
typedef enum fib_source_t_ {
/**
* An invalid source
* This is not a real source, so don't use it to source a prefix.
* It exists here to provide a value for inexistant/uninitialized source
*/
FIB_SOURCE_INVALID = 0,
/**
* 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,
/**
* From the BIER subsystem
*/
FIB_SOURCE_BIER,
/**
* From 6RD.
*/
FIB_SOURCE_6RD,
/**
* From the control plane API
*/
FIB_SOURCE_API,
/**
* From the CLI.
*/
FIB_SOURCE_CLI,
/**
* LISP
*/
FIB_SOURCE_LISP,
/**
* IPv[46] Mapping
*/
FIB_SOURCE_MAP,
/**
* DHCP
*/
FIB_SOURCE_DHCP,
/**
* IPv6 Proxy ND
*/
FIB_SOURCE_IP6_ND_PROXY,
/**
* IPv6 ND (seen in the link-local tables)
*/
FIB_SOURCE_IP6_ND,
/**
* 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,
/**
* The interpose source.
* This is not a real source, so don't use it to source a prefix.
* It exists here to provide a value against which to register to the
* VFT for providing the interpose actions to a real source.
*/
FIB_SOURCE_INTERPOSE,
/**
* Marker. add new entries before this one.
*/
FIB_SOURCE_LAST = FIB_SOURCE_INTERPOSE,
} __attribute__ ((packed)) fib_source_t;
STATIC_ASSERT (sizeof(fib_source_t) == 1,
"FIB too many sources");
#define FIB_SOURCES { \
[FIB_SOURCE_INVALID] = "invalid", \
[FIB_SOURCE_SPECIAL] = "special", \
[FIB_SOURCE_INTERFACE] = "interface", \
[FIB_SOURCE_PROXY] = "proxy", \
[FIB_SOURCE_BIER] = "BIER", \
[FIB_SOURCE_6RD] = "6RD", \
[FIB_SOURCE_API] = "API", \
[FIB_SOURCE_CLI] = "CLI", \
[FIB_SOURCE_ADJ] = "adjacency", \
[FIB_SOURCE_MAP] = "MAP", \
[FIB_SOURCE_SR] = "SR", \
[FIB_SOURCE_LISP] = "LISP", \
[FIB_SOURCE_CLASSIFY] = "classify", \
[FIB_SOURCE_DHCP] = "DHCP", \
[FIB_SOURCE_IP6_ND_PROXY] = "IPv6-proxy-nd", \
[FIB_SOURCE_IP6_ND] = "IPv6-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", \
[FIB_SOURCE_INTERPOSE] = "interpose", \
}
/**
* Each source is assigned a priority. lower priority is better.
* the source with the best source with have its contribution added
* to forwarding. the lesser sources will be 'remembered' by FIB and
* added to forwarding should the best source be removed.
*/
typedef u8 fib_source_priority_t;
/**
* source comparison
*/
typedef enum fib_source_priority_cmp_t_
{
FIB_SOURCE_CMP_BETTER,
FIB_SOURCE_CMP_WORSE,
FIB_SOURCE_CMP_EQUAL,
} fib_source_priority_cmp_t;
/**
* Each source has a defined behaviour that controls how entries
* behave that have that source.
* Sources with non-default behaviour may have a private data area
* in the fib_entry_src_t union.
*/
typedef enum fib_source_behaviour_t_
{
/**
* If you're adding a new source from a plugin pick one of these
*/
/** Default behaviour - always install a drop */
FIB_SOURCE_BH_DROP,
/** add paths with [mpls] path extensions */
FIB_SOURCE_BH_API,
/** add paths without path extensions */
FIB_SOURCE_BH_SIMPLE,
/**
* If your adding a new source from a plugin
* these are probably not the behaviour you're lokking for.
*/
/** recursive resolution w/ cover tracking*/
FIB_SOURCE_BH_RR,
/** associated label stored in private data */
FIB_SOURCE_BH_MPLS,
/** cover tracking w/ glean management */
FIB_SOURCE_BH_INTERFACE,
/** interpose */
FIB_SOURCE_BH_INTERPOSE,
/**
* simple behaviour, plus the source specific data stores the
* FIB index that is used for subsequent lookups using the
* packet's source address.
* This doesn't need to be a LISP specific source, it's just
* 'simple' behaviour with a u32 stored in the source specific data.
*/
FIB_SOURCE_BH_LISP,
/** adj w/ cover tracking + refinement */
FIB_SOURCE_BH_ADJ,
} fib_source_behaviour_t;
#define FIB_SOURCE_BH_MAX (FIB_SOURCE_BH_ADJ+1)
#define FIB_SOURCE_BEHAVIOURS { \
[FIB_SOURCE_BH_DROP] = "drop", \
[FIB_SOURCE_BH_RR] = "rr", \
[FIB_SOURCE_BH_MPLS] = "mpls", \
[FIB_SOURCE_BH_INTERFACE] = "interface", \
[FIB_SOURCE_BH_INTERPOSE] = "interpose", \
[FIB_SOURCE_BH_LISP] = "lisp", \
[FIB_SOURCE_BH_ADJ] = "adjacency", \
[FIB_SOURCE_BH_API] = "api", \
[FIB_SOURCE_BH_SIMPLE] = "simple", \
}
/**
* The fixed source to priority mappings.
* Declared here so those adding new sources can better determine their respective
* priority values.
*/
#define foreach_fib_source \
/** you can't do better then the special source */ \
_(FIB_SOURCE_SPECIAL, 0x00, FIB_SOURCE_BH_SIMPLE) \
_(FIB_SOURCE_CLASSIFY, 0x01, FIB_SOURCE_BH_SIMPLE) \
_(FIB_SOURCE_PROXY, 0x02, FIB_SOURCE_BH_SIMPLE) \
_(FIB_SOURCE_INTERFACE, 0x03, FIB_SOURCE_BH_INTERFACE) \
_(FIB_SOURCE_SR, 0x10, FIB_SOURCE_BH_API) \
_(FIB_SOURCE_BIER, 0x20, FIB_SOURCE_BH_SIMPLE) \
_(FIB_SOURCE_6RD, 0x30, FIB_SOURCE_BH_API) \
_(FIB_SOURCE_API, 0x80, FIB_SOURCE_BH_API) \
_(FIB_SOURCE_CLI, 0x81, FIB_SOURCE_BH_API) \
_(FIB_SOURCE_LISP, 0x90, FIB_SOURCE_BH_LISP) \
_(FIB_SOURCE_MAP, 0xa0, FIB_SOURCE_BH_SIMPLE) \
_(FIB_SOURCE_DHCP, 0xb0, FIB_SOURCE_BH_API) \
_(FIB_SOURCE_IP6_ND_PROXY, 0xc0, FIB_SOURCE_BH_API) \
_(FIB_SOURCE_IP6_ND, 0xc1, FIB_SOURCE_BH_API) \
_(FIB_SOURCE_ADJ, 0xd0, FIB_SOURCE_BH_ADJ) \
_(FIB_SOURCE_MPLS, 0xe0, FIB_SOURCE_BH_MPLS) \
_(FIB_SOURCE_AE, 0xf0, FIB_SOURCE_BH_SIMPLE) \
_(FIB_SOURCE_RR, 0xfb, FIB_SOURCE_BH_RR) \
_(FIB_SOURCE_URPF_EXEMPT, 0xfc, FIB_SOURCE_BH_RR) \
_(FIB_SOURCE_DEFAULT_ROUTE, 0xfd, FIB_SOURCE_BH_DROP) \
_(FIB_SOURCE_INTERPOSE, 0xfe, FIB_SOURCE_BH_INTERPOSE) \
_(FIB_SOURCE_INVALID, 0xff, FIB_SOURCE_BH_DROP)
/**
* Some priority values that plugins might use when they are not to concerned
* where in the list they'll go.
*/
#define FIB_SOURCE_PRIORITY_HI 0x10
#define FIB_SOURCE_PRIORITY_LOW 0xd0
extern u16 fib_source_get_prio(fib_source_t src);
extern fib_source_behaviour_t fib_source_get_behaviour(fib_source_t src);
extern fib_source_priority_cmp_t fib_source_cmp(fib_source_t s1,
fib_source_t s2);
extern u8 *format_fib_source(u8 *s, va_list *a);
extern fib_source_t fib_source_allocate(const char *name,
fib_source_priority_t prio,
fib_source_behaviour_t bh);
extern void fib_source_register(fib_source_t src,
fib_source_priority_t prio,
fib_source_behaviour_t bh);
typedef walk_rc_t (*fib_source_walk_t)(fib_source_t id,
const char *name,
fib_source_priority_t prio,
fib_source_behaviour_t bh,
void *ctx);
extern void fib_source_walk(fib_source_walk_t fn,
void *ctx);
extern void fib_source_module_init(void);
#endif
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