diff options
Diffstat (limited to 'bgpd/bgp_community.h')
| -rw-r--r-- | bgpd/bgp_community.h | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/bgpd/bgp_community.h b/bgpd/bgp_community.h new file mode 100644 index 0000000..7c7e7af --- /dev/null +++ b/bgpd/bgp_community.h @@ -0,0 +1,123 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* Community attribute related functions. + * Copyright (C) 1998 Kunihiro Ishiguro + */ + +#ifndef _QUAGGA_BGP_COMMUNITY_H +#define _QUAGGA_BGP_COMMUNITY_H + +#include "lib/json.h" +#include "bgpd/bgp_route.h" +#include "bgpd/bgp_attr.h" + +/* Communities attribute. */ +struct community { + /* Reference count of communities value. */ + unsigned long refcnt; + + /* Communities value size. */ + int size; + + /* Communities value. */ + uint32_t *val; + + /* Communities as a json object */ + json_object *json; + + /* String of community attribute. This sring is used by vty output + and expanded community-list for regular expression match. */ + char *str; +}; + +/* Well-known communities value. */ +#define COMMUNITY_GSHUT 0xFFFF0000 +#define COMMUNITY_ACCEPT_OWN 0xFFFF0001 +#define COMMUNITY_ROUTE_FILTER_TRANSLATED_v4 0xFFFF0002 +#define COMMUNITY_ROUTE_FILTER_v4 0xFFFF0003 +#define COMMUNITY_ROUTE_FILTER_TRANSLATED_v6 0xFFFF0004 +#define COMMUNITY_ROUTE_FILTER_v6 0xFFFF0005 +#define COMMUNITY_LLGR_STALE 0xFFFF0006 +#define COMMUNITY_NO_LLGR 0xFFFF0007 +#define COMMUNITY_ACCEPT_OWN_NEXTHOP 0xFFFF0008 +#define COMMUNITY_BLACKHOLE 0xFFFF029A +#define COMMUNITY_NO_EXPORT 0xFFFFFF01 +#define COMMUNITY_NO_ADVERTISE 0xFFFFFF02 +#define COMMUNITY_NO_EXPORT_SUBCONFED 0xFFFFFF03 +#define COMMUNITY_LOCAL_AS 0xFFFFFF03 +#define COMMUNITY_NO_PEER 0xFFFFFF04 + +#define COMMUNITY_SIZE 4 + +/* Macros of community attribute. */ +#define com_length(X) ((X)->size * COMMUNITY_SIZE) +#define com_lastval(X) ((X)->val + (X)->size - 1) +#define com_nthval(X,n) ((X)->val + (n)) + +/* Prototypes of communities attribute functions. */ +extern void community_init(void); +extern void community_finish(void); +extern void community_free(struct community **comm); +extern struct community *community_uniq_sort(struct community *com); +extern struct community *community_parse(uint32_t *pnt, unsigned short length); +extern struct community *community_intern(struct community *com); +extern void community_unintern(struct community **com); +extern char *community_str(struct community *com, bool make_json, + bool translate_alias); +extern unsigned int community_hash_make(const struct community *com); +extern struct community *community_str2com(const char *str); +extern bool community_match(const struct community *com1, + const struct community *com2); +extern bool community_cmp(const struct community *c1, + const struct community *c2); +extern struct community *community_merge(struct community *com1, + struct community *com2); +extern struct community *community_delete(struct community *com1, + struct community *com2); +extern struct community *community_dup(struct community *com); +extern bool community_include(struct community *com, uint32_t val); +extern void community_add_val(struct community *com, uint32_t val); +extern void community_del_val(struct community *com, uint32_t *val); +extern unsigned long community_count(void); +extern struct hash *community_hash(void); +extern uint32_t community_val_get(struct community *com, int i); +extern void bgp_compute_aggregate_community(struct bgp_aggregate *aggregate, + struct community *community); + +extern void bgp_compute_aggregate_community_val( + struct bgp_aggregate *aggregate); +extern void bgp_compute_aggregate_community_hash( + struct bgp_aggregate *aggregate, + struct community *community); +extern void bgp_remove_community_from_aggregate(struct bgp_aggregate *aggregate, + struct community *community); +extern void bgp_remove_comm_from_aggregate_hash(struct bgp_aggregate *aggregate, + struct community *community); +extern void bgp_aggr_community_remove(void *arg); + +/* This implies that when propagating routes into a VRF, the ACCEPT_OWN + * community SHOULD NOT be propagated. + */ +static inline void community_strip_accept_own(struct attr *attr) +{ + struct community *old_com = bgp_attr_get_community(attr); + struct community *new_com = NULL; + uint32_t val = COMMUNITY_ACCEPT_OWN; + + if (old_com && community_include(old_com, val)) { + new_com = community_dup(old_com); + val = htonl(val); + community_del_val(new_com, &val); + + if (!old_com->refcnt) + community_free(&old_com); + + if (!new_com->size) { + community_free(&new_com); + bgp_attr_set_community(attr, NULL); + } else { + bgp_attr_set_community(attr, new_com); + } + } +} + +#endif /* _QUAGGA_BGP_COMMUNITY_H */ |