nest/attrs.h

   1 /*
   2  *      BIRD Internet Routing Daemon -- Attribute Operations
   3  *
   4  *      (c) 2000 Martin Mares <mj@ucw.cz>
   5  *
   6  *      Can be freely distributed and used under the terms of the GNU GPL.
   7  */
   8
   9 #ifndef _BIRD_ATTRS_H_
  10 #define _BIRD_ATTRS_H_
  11
  12 #include <stdint.h>
  13
  14 /* a-path.c */
  15
  16 #define AS_PATH_SET             1       /* Types of path segments */
  17 #define AS_PATH_SEQUENCE        2
  18 #define AS_PATH_CONFED_SEQUENCE 3
  19 #define AS_PATH_CONFED_SET      4
  20
  21 #define AS_PATH_MAXLEN          10000
  22
  23 #define AS_TRANS                23456
  24 /* AS_TRANS is used when we need to store 32bit ASN larger than 0xFFFF
  25  * to 16bit slot (like in 16bit AS_PATH). See RFC 4893 for details
  26  */
  27
  28 struct adata *as_path_prepend(struct linpool *pool, struct adata *olda, u32 as);
  29 int as_path_convert_to_old(struct adata *path, byte *dst, int *new_used);
  30 int as_path_convert_to_new(struct adata *path, byte *dst, int req_as);
  31 void as_path_format(struct adata *path, byte *buf, unsigned int size);
  32 int as_path_getlen(struct adata *path);
  33 int as_path_getlen_int(struct adata *path, int bs);
  34 int as_path_get_first(struct adata *path, u32 *orig_as);
  35 int as_path_get_last(struct adata *path, u32 *last_as);
  36 int as_path_is_member(struct adata *path, u32 as);
  37
  38 #define PM_ASN          0
  39 #define PM_QUESTION     1
  40 #define PM_ASTERISK     2
  41 #define PM_ASN_EXPR     3
  42
  43 struct f_path_mask {
  44   struct f_path_mask *next;
  45   int kind;
  46   uintptr_t val;
  47 };
  48
  49 int as_path_match(struct adata *path, struct f_path_mask *mask);
  50
  51 /* a-set.c */
  52
  53
  54 /* Extended Community subtypes (kinds) */
  55 #define EC_RT 0x0002
  56 #define EC_RO 0x0003
  57
  58 #define EC_GENERIC 0xFFFF
  59
  60 /* Transitive bit (for first u32 half of EC) */
  61 #define EC_TBIT 0x40000000
  62
  63
  64 static inline int int_set_get_size(struct adata *list)
  65 { return list->length / 4; }
  66
  67 static inline u32 *int_set_get_data(struct adata *list)
  68 { return (u32 *) list->data; }
  69
  70 static inline u32 ec_hi(u64 ec) { return ec >> 32; }
  71 static inline u32 ec_lo(u64 ec) { return ec; }
  72 static inline u64 ec_get(const u32 *l, int i)
  73 { return (((u64) l[i]) << 32) | l[i+1]; }
  74
  75 /* RFC 4360 3.1.  Two-Octet AS Specific Extended Community */
  76 static inline u64 ec_as2(u64 kind, u64 key, u64 val)
  77 { return ((kind | 0x0000) << 48) | (key << 32) | val; }
  78
  79 /* RFC 5668  4-Octet AS Specific BGP Extended Community */
  80 static inline u64 ec_as4(u64 kind, u64 key, u64 val)
  81 { return ((kind | 0x0200) << 48) | (key << 16) | val; }
  82
  83 /* RFC 4360 3.2.  IPv4 Address Specific Extended Community */
  84 static inline u64 ec_ip4(u64 kind, u64 key, u64 val)
  85 { return ((kind | 0x0100) << 48) | (key << 16) | val; }
  86
  87 static inline u64 ec_generic(u64 key, u64 val)
  88 { return (key << 32) | val; }
  89
  90 int int_set_format(struct adata *set, int way, int from, byte *buf, unsigned int size);
  91 int ec_format(byte *buf, u64 ec);
  92 int ec_set_format(struct adata *set, int from, byte *buf, unsigned int size);
  93 int int_set_contains(struct adata *list, u32 val);
  94 int ec_set_contains(struct adata *list, u64 val);
  95 struct adata *int_set_add(struct linpool *pool, struct adata *list, u32 val);
  96 struct adata *ec_set_add(struct linpool *pool, struct adata *list, u64 val);
  97 struct adata *int_set_del(struct linpool *pool, struct adata *list, u32 val);
  98 struct adata *ec_set_del(struct linpool *pool, struct adata *list, u64 val);
  99 struct adata *int_set_union(struct linpool *pool, struct adata *l1, struct adata *l2);
 100 struct adata *ec_set_union(struct linpool *pool, struct adata *l1, struct adata *l2);
 101
 102
 103 #endif