mirror of
https://gitlab.nic.cz/labs/bird.git
synced 2024-12-22 09:41:54 +00:00
d15b0b0a1b
Integrated and extensible BGP with generalized AFI handling, support for IPv4+IPv6 AFI and unicast+multicast SAFI.
199 lines
6.2 KiB
C
199 lines
6.2 KiB
C
/*
|
|
* BIRD Internet Routing Daemon -- Attribute Operations
|
|
*
|
|
* (c) 2000 Martin Mares <mj@ucw.cz>
|
|
*
|
|
* Can be freely distributed and used under the terms of the GNU GPL.
|
|
*/
|
|
|
|
#ifndef _BIRD_ATTRS_H_
|
|
#define _BIRD_ATTRS_H_
|
|
|
|
#include <stdint.h>
|
|
#include "lib/unaligned.h"
|
|
#include "nest/route.h"
|
|
|
|
|
|
/* a-path.c */
|
|
|
|
#define AS_PATH_SET 1 /* Types of path segments */
|
|
#define AS_PATH_SEQUENCE 2
|
|
#define AS_PATH_CONFED_SEQUENCE 3
|
|
#define AS_PATH_CONFED_SET 4
|
|
|
|
#define AS_PATH_MAXLEN 10000
|
|
|
|
#define AS_TRANS 23456
|
|
/* AS_TRANS is used when we need to store 32bit ASN larger than 0xFFFF
|
|
* to 16bit slot (like in 16bit AS_PATH). See RFC 4893 for details
|
|
*/
|
|
|
|
struct f_tree;
|
|
|
|
int as_path_valid(byte *data, uint len, int bs, char *err, uint elen);
|
|
int as_path_16to32(byte *dst, byte *src, uint len);
|
|
int as_path_32to16(byte *dst, byte *src, uint len);
|
|
int as_path_contains_as4(const struct adata *path);
|
|
int as_path_contains_confed(const struct adata *path);
|
|
struct adata *as_path_strip_confed(struct linpool *pool, const struct adata *op);
|
|
struct adata *as_path_prepend2(struct linpool *pool, const struct adata *op, int seq, u32 as, int strip);
|
|
struct adata *as_path_to_old(struct linpool *pool, const struct adata *path);
|
|
void as_path_cut(struct adata *path, uint num);
|
|
struct adata *as_path_merge(struct linpool *pool, struct adata *p1, struct adata *p2);
|
|
void as_path_format(const struct adata *path, byte *buf, uint size);
|
|
int as_path_getlen(const struct adata *path);
|
|
int as_path_getlen_int(const struct adata *path, int bs);
|
|
int as_path_get_first(const struct adata *path, u32 *orig_as);
|
|
int as_path_get_last(const struct adata *path, u32 *last_as);
|
|
u32 as_path_get_last_nonaggregated(const struct adata *path);
|
|
int as_path_contains(const struct adata *path, u32 as, int min);
|
|
int as_path_match_set(const struct adata *path, struct f_tree *set);
|
|
struct adata *as_path_filter(struct linpool *pool, struct adata *path, struct f_tree *set, u32 key, int pos);
|
|
|
|
static inline struct adata *as_path_prepend(struct linpool *pool, const struct adata *path, u32 as)
|
|
{ return as_path_prepend2(pool, path, AS_PATH_SEQUENCE, as, 0); }
|
|
|
|
|
|
#define PM_ASN 0
|
|
#define PM_QUESTION 1
|
|
#define PM_ASTERISK 2
|
|
#define PM_ASN_EXPR 3
|
|
#define PM_ASN_RANGE 4
|
|
|
|
struct f_path_mask {
|
|
struct f_path_mask *next;
|
|
int kind;
|
|
uintptr_t val;
|
|
uintptr_t val2;
|
|
};
|
|
|
|
int as_path_match(const struct adata *path, struct f_path_mask *mask);
|
|
|
|
|
|
/* Counterparts to appropriate as_path_* functions */
|
|
|
|
static inline int
|
|
aggregator_16to32(byte *dst, byte *src)
|
|
{
|
|
put_u32(dst, get_u16(src));
|
|
memcpy(dst+4, src+2, 4);
|
|
return 8;
|
|
}
|
|
|
|
static inline int
|
|
aggregator_32to16(byte *dst, byte *src)
|
|
{
|
|
put_u16(dst, get_u32(src));
|
|
memcpy(dst+2, src+4, 4);
|
|
return 6;
|
|
}
|
|
|
|
static inline int
|
|
aggregator_contains_as4(struct adata *a)
|
|
{
|
|
return get_u32(a->data) > 0xFFFF;
|
|
}
|
|
|
|
static inline struct adata *
|
|
aggregator_to_old(struct linpool *pool, struct adata *a)
|
|
{
|
|
struct adata *d = lp_alloc_adata(pool, 8);
|
|
put_u32(d->data, 0xFFFF);
|
|
memcpy(d->data + 4, a->data + 4, 4);
|
|
return d;
|
|
}
|
|
|
|
|
|
/* a-set.c */
|
|
|
|
|
|
/* Extended Community subtypes (kinds) */
|
|
#define EC_RT 0x0002
|
|
#define EC_RO 0x0003
|
|
|
|
#define EC_GENERIC 0xFFFF
|
|
|
|
/* Transitive bit (for first u32 half of EC) */
|
|
#define EC_TBIT 0x40000000
|
|
|
|
#define ECOMM_LENGTH 8
|
|
|
|
static inline int int_set_get_size(struct adata *list)
|
|
{ return list->length / 4; }
|
|
|
|
static inline int ec_set_get_size(struct adata *list)
|
|
{ return list->length / 8; }
|
|
|
|
static inline int lc_set_get_size(struct adata *list)
|
|
{ return list->length / 12; }
|
|
|
|
static inline u32 *int_set_get_data(struct adata *list)
|
|
{ return (u32 *) list->data; }
|
|
|
|
static inline u32 ec_hi(u64 ec) { return ec >> 32; }
|
|
static inline u32 ec_lo(u64 ec) { return ec; }
|
|
static inline u64 ec_get(const u32 *l, int i)
|
|
{ return (((u64) l[i]) << 32) | l[i+1]; }
|
|
|
|
/* RFC 4360 3.1. Two-Octet AS Specific Extended Community */
|
|
static inline u64 ec_as2(u64 kind, u64 key, u64 val)
|
|
{ return ((kind | 0x0000) << 48) | (key << 32) | val; }
|
|
|
|
/* RFC 5668 4-Octet AS Specific BGP Extended Community */
|
|
static inline u64 ec_as4(u64 kind, u64 key, u64 val)
|
|
{ return ((kind | 0x0200) << 48) | (key << 16) | val; }
|
|
|
|
/* RFC 4360 3.2. IPv4 Address Specific Extended Community */
|
|
static inline u64 ec_ip4(u64 kind, u64 key, u64 val)
|
|
{ return ((kind | 0x0100) << 48) | (key << 16) | val; }
|
|
|
|
static inline u64 ec_generic(u64 key, u64 val)
|
|
{ return (key << 32) | val; }
|
|
|
|
/* Large community value */
|
|
typedef struct lcomm {
|
|
u32 asn;
|
|
u32 ldp1;
|
|
u32 ldp2;
|
|
} lcomm;
|
|
|
|
#define LCOMM_LENGTH 12
|
|
|
|
static inline lcomm lc_get(const u32 *l, int i)
|
|
{ return (lcomm) { l[i], l[i+1], l[i+2] }; }
|
|
|
|
static inline void lc_put(u32 *l, lcomm v)
|
|
{ l[0] = v.asn; l[1] = v.ldp1; l[2] = v.ldp2; }
|
|
|
|
static inline int lc_match(const u32 *l, int i, lcomm v)
|
|
{ return (l[i] == v.asn && l[i+1] == v.ldp1 && l[i+2] == v.ldp2); }
|
|
|
|
static inline u32 *lc_copy(u32 *dst, const u32 *src)
|
|
{ memcpy(dst, src, LCOMM_LENGTH); return dst + 3; }
|
|
|
|
|
|
int int_set_format(struct adata *set, int way, int from, byte *buf, uint size);
|
|
int ec_format(byte *buf, u64 ec);
|
|
int ec_set_format(struct adata *set, int from, byte *buf, uint size);
|
|
int lc_format(byte *buf, lcomm lc);
|
|
int lc_set_format(struct adata *set, int from, byte *buf, uint size);
|
|
int int_set_contains(struct adata *list, u32 val);
|
|
int ec_set_contains(struct adata *list, u64 val);
|
|
int lc_set_contains(struct adata *list, lcomm val);
|
|
struct adata *int_set_add(struct linpool *pool, struct adata *list, u32 val);
|
|
struct adata *ec_set_add(struct linpool *pool, struct adata *list, u64 val);
|
|
struct adata *lc_set_add(struct linpool *pool, struct adata *list, lcomm val);
|
|
struct adata *int_set_del(struct linpool *pool, struct adata *list, u32 val);
|
|
struct adata *ec_set_del(struct linpool *pool, struct adata *list, u64 val);
|
|
struct adata *lc_set_del(struct linpool *pool, struct adata *list, lcomm val);
|
|
struct adata *int_set_union(struct linpool *pool, struct adata *l1, struct adata *l2);
|
|
struct adata *ec_set_union(struct linpool *pool, struct adata *l1, struct adata *l2);
|
|
struct adata *lc_set_union(struct linpool *pool, struct adata *l1, struct adata *l2);
|
|
|
|
struct adata *ec_set_del_nontrans(struct linpool *pool, struct adata *set);
|
|
struct adata *int_set_sort(struct linpool *pool, struct adata *src);
|
|
struct adata *ec_set_sort(struct linpool *pool, struct adata *src);
|
|
struct adata *lc_set_sort(struct linpool *pool, struct adata *src);
|
|
|
|
#endif
|