Annotation of embedaddon/bird/nest/iface.h, revision 1.1
1.1 ! misho 1: /*
! 2: * BIRD Internet Routing Daemon -- Network Interfaces
! 3: *
! 4: * (c) 1998--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_IFACE_H_
! 10: #define _BIRD_IFACE_H_
! 11:
! 12: #include "lib/lists.h"
! 13:
! 14: extern list iface_list;
! 15:
! 16: struct proto;
! 17: struct pool;
! 18:
! 19: struct ifa { /* Interface address */
! 20: node n;
! 21: struct iface *iface; /* Interface this address belongs to */
! 22: ip_addr ip; /* IP address of this host */
! 23: ip_addr prefix; /* Network prefix */
! 24: unsigned pxlen; /* Prefix length */
! 25: ip_addr brd; /* Broadcast address */
! 26: ip_addr opposite; /* Opposite end of a point-to-point link */
! 27: unsigned scope; /* Interface address scope */
! 28: unsigned flags; /* Analogous to iface->flags */
! 29: };
! 30:
! 31: struct iface {
! 32: node n;
! 33: char name[16];
! 34: unsigned flags;
! 35: unsigned mtu;
! 36: unsigned index; /* OS-dependent interface index */
! 37: list addrs; /* Addresses assigned to this interface */
! 38: struct ifa *addr; /* Primary address */
! 39: list neighbors; /* All neighbors on this interface */
! 40: };
! 41:
! 42: #define IF_UP 1 /* IF_ADMIN_UP and IP address known */
! 43: #define IF_MULTIACCESS 2
! 44: #define IF_BROADCAST 4
! 45: #define IF_MULTICAST 8
! 46: #define IF_SHUTDOWN 0x10 /* Interface disappeared */
! 47: #define IF_LOOPBACK 0x20
! 48: #define IF_IGNORE 0x40 /* Not to be used by routing protocols (loopbacks etc.) */
! 49: #define IF_ADMIN_UP 0x80 /* Administrative up (e.g. IFF_UP in Linux) */
! 50: #define IF_LINK_UP 0x100 /* Link available (e.g. IFF_LOWER_UP in Linux) */
! 51:
! 52: #define IA_PRIMARY 0x10000 /* This address is primary */
! 53: #define IA_SECONDARY 0x20000 /* This address has been reported as secondary by the kernel */
! 54: #define IA_PEER 0x40000 /* A peer/ptp address */
! 55: #define IA_HOST 0x80000 /* A host/loopback address */
! 56: #define IA_FLAGS 0xff0000
! 57:
! 58: /*
! 59: * There are three kinds of addresses in BIRD:
! 60: * - Standard (prefix-based) addresses, these may define ifa.opposite (for /30 or /31).
! 61: * - Peer/ptp addresses, without common prefix for ifa.ip and ifa.opposite.
! 62: * ifa.opposite is defined and ifa.prefix/pxlen == ifa.opposite/32 (for simplicity).
! 63: * - Host addresses, with ifa.prefix/pxlen == ifa.ip/32 (or /128).
! 64: * May be considered a special case of standard addresses.
! 65: *
! 66: * Peer addresses (AFAIK) do not exist in IPv6. Linux also supports generalized peer
! 67: * addresses (with pxlen < 32 and ifa.ip outside prefix), we do not support that.
! 68: */
! 69:
! 70:
! 71: #define IF_JUST_CREATED 0x10000000 /* Send creation event as soon as possible */
! 72: #define IF_TMP_DOWN 0x20000000 /* Temporary shutdown due to interface reconfiguration */
! 73: #define IF_UPDATED 0x40000000 /* Touched in last scan */
! 74:
! 75: /* Interface change events */
! 76:
! 77: #define IF_CHANGE_UP 1
! 78: #define IF_CHANGE_DOWN 2
! 79: #define IF_CHANGE_MTU 4
! 80: #define IF_CHANGE_CREATE 8 /* Seen this interface for the first time */
! 81: #define IF_CHANGE_LINK 0x10
! 82: #define IF_CHANGE_TOO_MUCH 0x40000000 /* Used internally */
! 83:
! 84: void if_init(void);
! 85: void if_dump(struct iface *);
! 86: void if_dump_all(void);
! 87: void ifa_dump(struct ifa *);
! 88: void if_show(void);
! 89: void if_show_summary(void);
! 90: struct iface *if_update(struct iface *);
! 91: void if_delete(struct iface *old);
! 92: struct ifa *ifa_update(struct ifa *);
! 93: void ifa_delete(struct ifa *);
! 94: void if_start_update(void);
! 95: void if_end_partial_update(struct iface *);
! 96: void if_end_update(void);
! 97: void if_flush_ifaces(struct proto *p);
! 98: void if_feed_baby(struct proto *);
! 99: struct iface *if_find_by_index(unsigned);
! 100: struct iface *if_find_by_name(char *);
! 101: struct iface *if_get_by_name(char *);
! 102: void ifa_recalc_all_primary_addresses(void);
! 103:
! 104:
! 105: /* The Neighbor Cache */
! 106:
! 107: typedef struct neighbor {
! 108: node n; /* Node in global neighbor list */
! 109: node if_n; /* Node in per-interface neighbor list */
! 110: ip_addr addr; /* Address of the neighbor */
! 111: struct ifa *ifa; /* Ifa on related iface */
! 112: struct iface *iface; /* Interface it's connected to */
! 113: struct proto *proto; /* Protocol this belongs to */
! 114: void *data; /* Protocol-specific data */
! 115: unsigned aux; /* Protocol-specific data */
! 116: unsigned flags;
! 117: int scope; /* Address scope, -1 for unreachable sticky neighbors,
! 118: SCOPE_HOST when it's our own address */
! 119: } neighbor;
! 120:
! 121: #define NEF_STICKY 1
! 122: #define NEF_ONLINK 2
! 123: #define NEF_BIND 4 /* Used internally for neighbors bound to an iface */
! 124:
! 125: neighbor *neigh_find(struct proto *, ip_addr *, unsigned flags);
! 126: neighbor *neigh_find2(struct proto *p, ip_addr *a, struct iface *ifa, unsigned flags);
! 127:
! 128: static inline int neigh_connected_to(struct proto *p, ip_addr *a, struct iface *i)
! 129: {
! 130: neighbor *n = neigh_find(p, a, 0);
! 131: return n && n->iface == i;
! 132: }
! 133:
! 134: void neigh_dump(neighbor *);
! 135: void neigh_dump_all(void);
! 136: void neigh_prune(void);
! 137: void neigh_if_up(struct iface *);
! 138: void neigh_if_down(struct iface *);
! 139: void neigh_if_link(struct iface *);
! 140: void neigh_ifa_update(struct ifa *);
! 141: void neigh_init(struct pool *);
! 142:
! 143: /*
! 144: * Interface Pattern Lists
! 145: */
! 146:
! 147: struct iface_patt_node {
! 148: node n;
! 149: int positive;
! 150: byte *pattern;
! 151: ip_addr prefix;
! 152: int pxlen;
! 153: };
! 154:
! 155: struct iface_patt {
! 156: node n;
! 157: list ipn_list; /* A list of struct iface_patt_node */
! 158:
! 159: /* Protocol-specific data follow after this structure */
! 160: };
! 161:
! 162: int iface_patt_match(struct iface_patt *ifp, struct iface *i, struct ifa *a);
! 163: struct iface_patt *iface_patt_find(list *l, struct iface *i, struct ifa *a);
! 164: int iface_patts_equal(list *, list *, int (*)(struct iface_patt *, struct iface_patt *));
! 165:
! 166:
! 167: u32 if_choose_router_id(struct iface_patt *mask, u32 old_id);
! 168:
! 169: #endif
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