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iof-bird-daemon / nest / attrs.h @ d47c3d64

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/*
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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_tree;
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int as_path_valid(byte *data, uint len, int bs, char *err, uint elen);
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int as_path_16to32(byte *dst, byte *src, uint len);
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int as_path_32to16(byte *dst, 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, int strip);
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struct adata *as_path_to_old(struct linpool *pool, const struct adata *path);
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void as_path_cut(struct adata *path, uint num);
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struct adata *as_path_merge(struct linpool *pool, struct adata *p1, 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_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, struct f_tree *set);
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struct adata *as_path_filter(struct linpool *pool, struct adata *path, struct f_tree *set, u32 key, int pos);
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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, 0); }
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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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struct f_path_mask {
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  struct f_path_mask *next;
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  int kind;
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  uintptr_t val;
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  uintptr_t val2;
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};
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int as_path_match(const struct adata *path, 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, 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, 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(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, 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, 0xFFFF);
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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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#define EC_RT 0x0002
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#define EC_RO 0x0003
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#define EC_GENERIC 0xFFFF
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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(struct adata *list)
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{ return list->length / 4; }
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static inline int ec_set_get_size(struct adata *list)
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{ return list->length / 8; }
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static inline int lc_set_get_size(struct adata *list)
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{ return list->length / 12; }
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static inline u32 *int_set_get_data(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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/* RFC 4360 3.1.  Two-Octet AS Specific Extended Community */
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static inline u64 ec_as2(u64 kind, u64 key, u64 val)
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{ return ((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(u64 kind, u64 key, u64 val)
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{ return ((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(u64 kind, u64 key, u64 val)
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{ return ((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(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(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(struct adata *set, int from, byte *buf, uint size);
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int int_set_contains(struct adata *list, u32 val);
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int ec_set_contains(struct adata *list, u64 val);
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int lc_set_contains(struct adata *list, lcomm val);
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struct adata *int_set_add(struct linpool *pool, struct adata *list, u32 val);
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struct adata *ec_set_add(struct linpool *pool, struct adata *list, u64 val);
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struct adata *lc_set_add(struct linpool *pool, struct adata *list, lcomm val);
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struct adata *int_set_del(struct linpool *pool, struct adata *list, u32 val);
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struct adata *ec_set_del(struct linpool *pool, struct adata *list, u64 val);
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struct adata *lc_set_del(struct linpool *pool, struct adata *list, lcomm val);
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struct adata *int_set_union(struct linpool *pool, struct adata *l1, struct adata *l2);
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struct adata *ec_set_union(struct linpool *pool, struct adata *l1, struct adata *l2);
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struct adata *lc_set_union(struct linpool *pool, struct adata *l1, struct adata *l2);
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struct adata *ec_set_del_nontrans(struct linpool *pool, struct adata *set);
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struct adata *int_set_sort(struct linpool *pool, struct adata *src);
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struct adata *ec_set_sort(struct linpool *pool, struct adata *src);
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struct adata *lc_set_sort(struct linpool *pool, struct adata *src);
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#endif