Annotation of embedaddon/quagga/bgpd/bgp_attr.h, revision 1.1
1.1 ! misho 1: /* BGP attributes.
! 2: Copyright (C) 1996, 97, 98 Kunihiro Ishiguro
! 3:
! 4: This file is part of GNU Zebra.
! 5:
! 6: GNU Zebra is free software; you can redistribute it and/or modify it
! 7: under the terms of the GNU General Public License as published by the
! 8: Free Software Foundation; either version 2, or (at your option) any
! 9: later version.
! 10:
! 11: GNU Zebra is distributed in the hope that it will be useful, but
! 12: WITHOUT ANY WARRANTY; without even the implied warranty of
! 13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
! 14: General Public License for more details.
! 15:
! 16: You should have received a copy of the GNU General Public License
! 17: along with GNU Zebra; see the file COPYING. If not, write to the Free
! 18: Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
! 19: 02111-1307, USA. */
! 20:
! 21: #ifndef _QUAGGA_BGP_ATTR_H
! 22: #define _QUAGGA_BGP_ATTR_H
! 23:
! 24: /* Simple bit mapping. */
! 25: #define BITMAP_NBBY 8
! 26:
! 27: #define SET_BITMAP(MAP, NUM) \
! 28: SET_FLAG (MAP[(NUM) / BITMAP_NBBY], 1 << ((NUM) % BITMAP_NBBY))
! 29:
! 30: #define CHECK_BITMAP(MAP, NUM) \
! 31: CHECK_FLAG (MAP[(NUM) / BITMAP_NBBY], 1 << ((NUM) % BITMAP_NBBY))
! 32:
! 33: #define BGP_MED_MAX UINT32_MAX
! 34:
! 35:
! 36: /* BGP Attribute type range. */
! 37: #define BGP_ATTR_TYPE_RANGE 256
! 38: #define BGP_ATTR_BITMAP_SIZE (BGP_ATTR_TYPE_RANGE / BITMAP_NBBY)
! 39:
! 40: /* BGP Attribute flags. */
! 41: #define BGP_ATTR_FLAG_OPTIONAL 0x80 /* Attribute is optional. */
! 42: #define BGP_ATTR_FLAG_TRANS 0x40 /* Attribute is transitive. */
! 43: #define BGP_ATTR_FLAG_PARTIAL 0x20 /* Attribute is partial. */
! 44: #define BGP_ATTR_FLAG_EXTLEN 0x10 /* Extended length flag. */
! 45:
! 46: /* BGP attribute header must bigger than 2. */
! 47: #define BGP_ATTR_MIN_LEN 3 /* Attribute flag, type length. */
! 48: #define BGP_ATTR_DEFAULT_WEIGHT 32768
! 49:
! 50: /* Additional/uncommon BGP attributes.
! 51: * lazily allocated as and when a struct attr
! 52: * requires it.
! 53: */
! 54: struct attr_extra
! 55: {
! 56: /* Multi-Protocol Nexthop, AFI IPv6 */
! 57: #ifdef HAVE_IPV6
! 58: struct in6_addr mp_nexthop_global;
! 59: struct in6_addr mp_nexthop_local;
! 60: #endif /* HAVE_IPV6 */
! 61:
! 62: /* Extended Communities attribute. */
! 63: struct ecommunity *ecommunity;
! 64:
! 65: /* Route-Reflector Cluster attribute */
! 66: struct cluster_list *cluster;
! 67:
! 68: /* Unknown transitive attribute. */
! 69: struct transit *transit;
! 70:
! 71: struct in_addr mp_nexthop_global_in;
! 72: struct in_addr mp_nexthop_local_in;
! 73:
! 74: /* Aggregator Router ID attribute */
! 75: struct in_addr aggregator_addr;
! 76:
! 77: /* Route Reflector Originator attribute */
! 78: struct in_addr originator_id;
! 79:
! 80: /* Local weight, not actually an attribute */
! 81: u_int32_t weight;
! 82:
! 83: /* Aggregator ASN */
! 84: as_t aggregator_as;
! 85:
! 86: /* MP Nexthop length */
! 87: u_char mp_nexthop_len;
! 88: };
! 89:
! 90: /* BGP core attribute structure. */
! 91: struct attr
! 92: {
! 93: /* AS Path structure */
! 94: struct aspath *aspath;
! 95:
! 96: /* Community structure */
! 97: struct community *community;
! 98:
! 99: /* Lazily allocated pointer to extra attributes */
! 100: struct attr_extra *extra;
! 101:
! 102: /* Reference count of this attribute. */
! 103: unsigned long refcnt;
! 104:
! 105: /* Flag of attribute is set or not. */
! 106: u_int32_t flag;
! 107:
! 108: /* Apart from in6_addr, the remaining static attributes */
! 109: struct in_addr nexthop;
! 110: u_int32_t med;
! 111: u_int32_t local_pref;
! 112:
! 113: /* Path origin attribute */
! 114: u_char origin;
! 115: };
! 116:
! 117: /* Router Reflector related structure. */
! 118: struct cluster_list
! 119: {
! 120: unsigned long refcnt;
! 121: int length;
! 122: struct in_addr *list;
! 123: };
! 124:
! 125: /* Unknown transit attribute. */
! 126: struct transit
! 127: {
! 128: unsigned long refcnt;
! 129: int length;
! 130: u_char *val;
! 131: };
! 132:
! 133: #define ATTR_FLAG_BIT(X) (1 << ((X) - 1))
! 134:
! 135: typedef enum {
! 136: BGP_ATTR_PARSE_PROCEED = 0,
! 137: BGP_ATTR_PARSE_ERROR = -1,
! 138: BGP_ATTR_PARSE_WITHDRAW = -2,
! 139: } bgp_attr_parse_ret_t;
! 140:
! 141: /* Prototypes. */
! 142: extern void bgp_attr_init (void);
! 143: extern void bgp_attr_finish (void);
! 144: extern bgp_attr_parse_ret_t bgp_attr_parse (struct peer *, struct attr *,
! 145: bgp_size_t, struct bgp_nlri *,
! 146: struct bgp_nlri *);
! 147: extern int bgp_attr_check (struct peer *, struct attr *);
! 148: extern struct attr_extra *bgp_attr_extra_get (struct attr *);
! 149: extern void bgp_attr_extra_free (struct attr *);
! 150: extern void bgp_attr_dup (struct attr *, struct attr *);
! 151: extern struct attr *bgp_attr_intern (struct attr *attr);
! 152: extern void bgp_attr_unintern_sub (struct attr *);
! 153: extern void bgp_attr_unintern (struct attr **);
! 154: extern void bgp_attr_flush (struct attr *);
! 155: extern struct attr *bgp_attr_default_set (struct attr *attr, u_char);
! 156: extern struct attr *bgp_attr_default_intern (u_char);
! 157: extern struct attr *bgp_attr_aggregate_intern (struct bgp *, u_char,
! 158: struct aspath *,
! 159: struct community *, int as_set);
! 160: extern bgp_size_t bgp_packet_attribute (struct bgp *bgp, struct peer *,
! 161: struct stream *, struct attr *,
! 162: struct prefix *, afi_t, safi_t,
! 163: struct peer *, struct prefix_rd *, u_char *);
! 164: extern bgp_size_t bgp_packet_withdraw (struct peer *peer, struct stream *s,
! 165: struct prefix *p, afi_t, safi_t,
! 166: struct prefix_rd *, u_char *);
! 167: extern void bgp_dump_routes_attr (struct stream *, struct attr *,
! 168: struct prefix *);
! 169: extern int attrhash_cmp (const void *, const void *);
! 170: extern unsigned int attrhash_key_make (void *);
! 171: extern void attr_show_all (struct vty *);
! 172: extern unsigned long int attr_count (void);
! 173: extern unsigned long int attr_unknown_count (void);
! 174:
! 175: /* Cluster list prototypes. */
! 176: extern int cluster_loop_check (struct cluster_list *, struct in_addr);
! 177: extern void cluster_unintern (struct cluster_list *);
! 178:
! 179: /* Transit attribute prototypes. */
! 180: void transit_unintern (struct transit *);
! 181:
! 182: /* Exported for unit-test purposes only */
! 183: extern int bgp_mp_reach_parse (struct peer *, bgp_size_t, struct attr *,
! 184: struct bgp_nlri *);
! 185: extern int bgp_mp_unreach_parse (struct peer *, bgp_size_t, struct bgp_nlri *);
! 186:
! 187: #endif /* _QUAGGA_BGP_ATTR_H */
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