245 lines
8.1 KiB
C
245 lines
8.1 KiB
C
/*
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* BIRD Internet Routing Daemon -- Attribute Operations
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*
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* (c) 2000 Martin Mares <mj@ucw.cz>
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*
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* Can be freely distributed and used under the terms of the GNU GPL.
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*/
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#ifndef _BIRD_ATTRS_H_
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#define _BIRD_ATTRS_H_
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#include <stdint.h>
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#include "lib/unaligned.h"
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#include "nest/route.h"
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/* a-path.c */
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#define AS_PATH_SET 1 /* Types of path segments */
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#define AS_PATH_SEQUENCE 2
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#define AS_PATH_CONFED_SEQUENCE 3
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#define AS_PATH_CONFED_SET 4
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#define AS_PATH_MAXLEN 10000
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#define AS_TRANS 23456
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/* AS_TRANS is used when we need to store 32bit ASN larger than 0xFFFF
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* to 16bit slot (like in 16bit AS_PATH). See RFC 4893 for details
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*/
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struct f_val;
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struct f_tree;
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int as_path_valid(byte *data, uint len, int bs, int sets, int confed, char *err, uint elen);
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int as_path_16to32(byte *dst, const byte *src, uint len);
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int as_path_32to16(byte *dst, const byte *src, uint len);
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int as_path_contains_as4(const struct adata *path);
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int as_path_contains_confed(const struct adata *path);
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struct adata *as_path_strip_confed(struct linpool *pool, const struct adata *op);
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struct adata *as_path_prepend2(struct linpool *pool, const struct adata *op, int seq, u32 as);
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struct adata *as_path_to_old(struct linpool *pool, const struct adata *path);
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struct adata *as_path_cut(struct linpool *pool, const struct adata *path, uint num);
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const struct adata *as_path_merge(struct linpool *pool, const struct adata *p1, const struct adata *p2);
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void as_path_format(const struct adata *path, byte *buf, uint size);
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int as_path_getlen(const struct adata *path);
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int as_path_getlen_int(const struct adata *path, int bs);
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int as_path_get_first(const struct adata *path, u32 *orig_as);
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int as_path_get_first_regular(const struct adata *path, u32 *last_as);
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int as_path_get_last(const struct adata *path, u32 *last_as);
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u32 as_path_get_last_nonaggregated(const struct adata *path);
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int as_path_contains(const struct adata *path, u32 as, int min);
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int as_path_match_set(const struct adata *path, const struct f_tree *set);
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const struct adata *as_path_filter(struct linpool *pool, const struct adata *path, const struct f_val *set, int pos);
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int as_path_walk(const struct adata *path, uint *pos, uint *val);
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static inline struct adata *as_path_prepend(struct linpool *pool, const struct adata *path, u32 as)
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{ return as_path_prepend2(pool, path, AS_PATH_SEQUENCE, as); }
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#define PM_ASN 0
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#define PM_QUESTION 1
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#define PM_ASTERISK 2
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#define PM_ASN_EXPR 3
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#define PM_ASN_RANGE 4
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#define PM_ASN_SET 5
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#define PM_LOOP 6
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struct f_path_mask_item {
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union {
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u32 asn; /* PM_ASN */
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const struct f_line *expr; /* PM_ASN_EXPR */
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const struct f_tree *set; /* PM_ASN_SET */
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struct { /* PM_ASN_RANGE */
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u32 from;
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u32 to;
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};
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};
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int kind;
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};
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struct f_path_mask {
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uint len;
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struct f_path_mask_item item[0];
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};
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int as_path_match(const struct adata *path, const struct f_path_mask *mask);
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/* Counterparts to appropriate as_path_* functions */
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static inline int
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aggregator_16to32(byte *dst, const byte *src)
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{
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put_u32(dst, get_u16(src));
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memcpy(dst+4, src+2, 4);
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return 8;
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}
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static inline int
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aggregator_32to16(byte *dst, const byte *src)
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{
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put_u16(dst, get_u32(src));
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memcpy(dst+2, src+4, 4);
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return 6;
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}
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static inline int
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aggregator_contains_as4(const struct adata *a)
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{
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return get_u32(a->data) > 0xFFFF;
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}
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static inline struct adata *
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aggregator_to_old(struct linpool *pool, const struct adata *a)
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{
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struct adata *d = lp_alloc_adata(pool, 8);
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put_u32(d->data, AS_TRANS);
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memcpy(d->data + 4, a->data + 4, 4);
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return d;
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}
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/* a-set.c */
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/* Extended Community subtypes (kinds) */
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enum ec_subtype {
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EC_RT = 0x0002,
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EC_RO = 0x0003,
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EC_GENERIC = 0xFFFF,
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};
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static inline const char *ec_subtype_str(const enum ec_subtype ecs) {
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switch (ecs) {
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case EC_RT: return "rt";
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case EC_RO: return "ro";
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default: return NULL;
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}
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}
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/* Check for EC_RT subtype within different types (0-2) */
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static inline int ec_type_is_rt(uint type)
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{ return (type == EC_RT) || (type == (0x0100 | EC_RT)) || (type == (0x0200 | EC_RT)); }
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/* Transitive bit (for first u32 half of EC) */
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#define EC_TBIT 0x40000000
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#define ECOMM_LENGTH 8
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static inline int int_set_get_size(const struct adata *list)
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{ return list->length / 4; }
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static inline int ec_set_get_size(const struct adata *list)
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{ return list->length / 8; }
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static inline int lc_set_get_size(const struct adata *list)
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{ return list->length / 12; }
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static inline u32 *int_set_get_data(const struct adata *list)
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{ return (u32 *) list->data; }
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static inline u32 ec_hi(u64 ec) { return ec >> 32; }
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static inline u32 ec_lo(u64 ec) { return ec; }
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static inline u64 ec_get(const u32 *l, int i)
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{ return (((u64) l[i]) << 32) | l[i+1]; }
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static inline void ec_put(u32 *l, int i, u64 val)
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{ l[i] = ec_hi(val); l[i+1] = ec_lo(val); }
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/* RFC 4360 3.1. Two-Octet AS Specific Extended Community */
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static inline u64 ec_as2(enum ec_subtype kind, u64 key, u64 val)
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{ return (((u64) kind | 0x0000) << 48) | (key << 32) | val; }
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/* RFC 5668 4-Octet AS Specific BGP Extended Community */
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static inline u64 ec_as4(enum ec_subtype kind, u64 key, u64 val)
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{ return (((u64) kind | 0x0200) << 48) | (key << 16) | val; }
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/* RFC 4360 3.2. IPv4 Address Specific Extended Community */
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static inline u64 ec_ip4(enum ec_subtype kind, u64 key, u64 val)
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{ return (((u64) kind | 0x0100) << 48) | (key << 16) | val; }
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static inline u64 ec_generic(u64 key, u64 val)
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{ return (key << 32) | val; }
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/* Large community value */
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typedef struct lcomm {
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u32 asn;
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u32 ldp1;
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u32 ldp2;
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} lcomm;
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#define LCOMM_LENGTH 12
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static inline lcomm lc_get(const u32 *l, int i)
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{ return (lcomm) { l[i], l[i+1], l[i+2] }; }
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static inline void lc_put(u32 *l, lcomm v)
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{ l[0] = v.asn; l[1] = v.ldp1; l[2] = v.ldp2; }
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static inline int lc_match(const u32 *l, int i, lcomm v)
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{ return (l[i] == v.asn && l[i+1] == v.ldp1 && l[i+2] == v.ldp2); }
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static inline u32 *lc_copy(u32 *dst, const u32 *src)
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{ memcpy(dst, src, LCOMM_LENGTH); return dst + 3; }
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int int_set_format(const struct adata *set, int way, int from, byte *buf, uint size);
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int ec_format(byte *buf, u64 ec);
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int ec_set_format(const struct adata *set, int from, byte *buf, uint size);
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int lc_format(byte *buf, lcomm lc);
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int lc_set_format(const struct adata *set, int from, byte *buf, uint size);
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int int_set_contains(const struct adata *list, u32 val);
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int ec_set_contains(const struct adata *list, u64 val);
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int lc_set_contains(const struct adata *list, lcomm val);
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const struct adata *int_set_prepend(struct linpool *pool, const struct adata *list, u32 val);
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const struct adata *int_set_add(struct linpool *pool, const struct adata *list, u32 val);
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const struct adata *ec_set_add(struct linpool *pool, const struct adata *list, u64 val);
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const struct adata *lc_set_add(struct linpool *pool, const struct adata *list, lcomm val);
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const struct adata *int_set_del(struct linpool *pool, const struct adata *list, u32 val);
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const struct adata *ec_set_del(struct linpool *pool, const struct adata *list, u64 val);
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const struct adata *lc_set_del(struct linpool *pool, const struct adata *list, lcomm val);
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const struct adata *int_set_union(struct linpool *pool, const struct adata *l1, const struct adata *l2);
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const struct adata *ec_set_union(struct linpool *pool, const struct adata *l1, const struct adata *l2);
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const struct adata *lc_set_union(struct linpool *pool, const struct adata *l1, const struct adata *l2);
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struct adata *ec_set_del_nontrans(struct linpool *pool, const struct adata *set);
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struct adata *int_set_sort(struct linpool *pool, const struct adata *src);
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struct adata *ec_set_sort(struct linpool *pool, const struct adata *src);
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struct adata *lc_set_sort(struct linpool *pool, const struct adata *src);
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int int_set_min(const struct adata *list, u32 *val);
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int ec_set_min(const struct adata *list, u64 *val);
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int lc_set_min(const struct adata *list, lcomm *val);
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int int_set_max(const struct adata *list, u32 *val);
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int ec_set_max(const struct adata *list, u64 *val);
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int lc_set_max(const struct adata *list, lcomm *val);
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int int_set_walk(const struct adata *list, uint *pos, u32 *val);
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int ec_set_walk(const struct adata *list, uint *pos, u64 *val);
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int lc_set_walk(const struct adata *list, uint *pos, lcomm *val);
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void ec_set_sort_x(struct adata *set); /* Sort in place */
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#endif
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