Annotation of embedaddon/bird2/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: #include "lib/ip.h"
! 14:
! 15: extern list iface_list;
! 16:
! 17: struct proto;
! 18: struct pool;
! 19:
! 20: struct ifa { /* Interface address */
! 21: node n;
! 22: struct iface *iface; /* Interface this address belongs to */
! 23: net_addr prefix; /* Network prefix */
! 24: ip_addr ip; /* IP address of this host */
! 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: unsigned master_index; /* Interface index of master iface */
! 38: struct iface *master; /* Master iface (e.g. for VRF) */
! 39: list addrs; /* Addresses assigned to this interface */
! 40: struct ifa *addr4; /* Primary address for IPv4 */
! 41: struct ifa *addr6; /* Primary address for IPv6 */
! 42: struct ifa *llv6; /* Primary link-local address for IPv6 */
! 43: ip4_addr sysdep; /* Arbitrary IPv4 address for internal sysdep use */
! 44: list neighbors; /* All neighbors on this interface */
! 45: };
! 46:
! 47: #define IF_UP 1 /* Currently just IF_ADMIN_UP */
! 48: #define IF_MULTIACCESS 2
! 49: #define IF_BROADCAST 4
! 50: #define IF_MULTICAST 8
! 51: #define IF_SHUTDOWN 0x10 /* Interface disappeared */
! 52: #define IF_LOOPBACK 0x20
! 53: #define IF_IGNORE 0x40 /* Not to be used by routing protocols (loopbacks etc.) */
! 54: #define IF_ADMIN_UP 0x80 /* Administrative up (e.g. IFF_UP in Linux) */
! 55: #define IF_LINK_UP 0x100 /* Link available (e.g. IFF_LOWER_UP in Linux) */
! 56:
! 57: #define IA_PRIMARY 0x10000 /* This address is primary */
! 58: #define IA_SECONDARY 0x20000 /* This address has been reported as secondary by the kernel */
! 59: #define IA_PEER 0x40000 /* A peer/ptp address */
! 60: #define IA_HOST 0x80000 /* A host/loopback address */
! 61: #define IA_FLAGS 0xff0000
! 62:
! 63: /*
! 64: * There are three kinds of addresses in BIRD:
! 65: * - Standard (prefix-based) addresses, these may define ifa.opposite (for /30 or /31).
! 66: * - Peer/ptp addresses, without common prefix for ifa.ip and ifa.opposite.
! 67: * ifa.opposite is defined and ifa.prefix/pxlen == ifa.opposite/32 (for simplicity).
! 68: * - Host addresses, with ifa.prefix/pxlen == ifa.ip/32 (or /128).
! 69: * May be considered a special case of standard addresses.
! 70: *
! 71: * Peer addresses (AFAIK) do not exist in IPv6. Linux also supports generalized peer
! 72: * addresses (with pxlen < 32 and ifa.ip outside prefix), we do not support that.
! 73: */
! 74:
! 75:
! 76: #define IF_JUST_CREATED 0x10000000 /* Send creation event as soon as possible */
! 77: #define IF_TMP_DOWN 0x20000000 /* Temporary shutdown due to interface reconfiguration */
! 78: #define IF_UPDATED 0x40000000 /* Iface touched in last scan */
! 79: #define IF_NEEDS_RECALC 0x80000000 /* Preferred address recalculation is needed */
! 80: #define IF_LOST_ADDR4 0x01000000 /* Preferred address was deleted, notification needed */
! 81: #define IF_LOST_ADDR6 0x02000000
! 82: #define IF_LOST_LLV6 0x04000000
! 83:
! 84: #define IA_UPDATED IF_UPDATED /* Address touched in last scan */
! 85:
! 86: /* Interface change events */
! 87:
! 88: #define IF_CHANGE_UP 1
! 89: #define IF_CHANGE_DOWN 2
! 90: #define IF_CHANGE_MTU 4
! 91: #define IF_CHANGE_CREATE 8 /* Seen this interface for the first time */
! 92: #define IF_CHANGE_LINK 0x10
! 93: #define IF_CHANGE_ADDR4 0x100 /* Change of iface->addr4 */
! 94: #define IF_CHANGE_ADDR6 0x200 /* ... */
! 95: #define IF_CHANGE_LLV6 0x400
! 96: #define IF_CHANGE_SYSDEP 0x800
! 97: #define IF_CHANGE_TOO_MUCH 0x40000000 /* Used internally */
! 98:
! 99: #define IF_CHANGE_UPDOWN (IF_CHANGE_UP | IF_CHANGE_DOWN)
! 100: #define IF_CHANGE_PREFERRED (IF_CHANGE_ADDR4 | IF_CHANGE_ADDR6 | IF_CHANGE_LLV6)
! 101:
! 102: void if_init(void);
! 103: void if_dump(struct iface *);
! 104: void if_dump_all(void);
! 105: void ifa_dump(struct ifa *);
! 106: void if_show(void);
! 107: void if_show_summary(void);
! 108: struct iface *if_update(struct iface *);
! 109: void if_delete(struct iface *old);
! 110: struct ifa *ifa_update(struct ifa *);
! 111: void ifa_delete(struct ifa *);
! 112: void if_start_update(void);
! 113: void if_end_partial_update(struct iface *);
! 114: void if_end_update(void);
! 115: void if_flush_ifaces(struct proto *p);
! 116: void if_feed_baby(struct proto *);
! 117: struct iface *if_find_by_index(unsigned);
! 118: struct iface *if_find_by_name(char *);
! 119: struct iface *if_get_by_name(char *);
! 120: void if_recalc_all_preferred_addresses(void);
! 121:
! 122:
! 123: /* The Neighbor Cache */
! 124:
! 125: typedef struct neighbor {
! 126: node n; /* Node in global neighbor list */
! 127: node if_n; /* Node in per-interface neighbor list */
! 128: ip_addr addr; /* Address of the neighbor */
! 129: struct ifa *ifa; /* Ifa on related iface */
! 130: struct iface *iface; /* Interface it's connected to */
! 131: struct iface *ifreq; /* Requested iface, NULL for any */
! 132: struct proto *proto; /* Protocol this belongs to */
! 133: void *data; /* Protocol-specific data */
! 134: uint aux; /* Protocol-specific data */
! 135: u16 flags; /* NEF_* flags */
! 136: s16 scope; /* Address scope, -1 for unreachable neighbors,
! 137: SCOPE_HOST when it's our own address */
! 138: } neighbor;
! 139:
! 140: #define NEF_STICKY 1
! 141: #define NEF_ONLINK 2
! 142: #define NEF_IFACE 4 /* Entry for whole iface */
! 143:
! 144:
! 145: neighbor *neigh_find(struct proto *p, ip_addr a, struct iface *ifa, uint flags);
! 146:
! 147: void neigh_dump(neighbor *);
! 148: void neigh_dump_all(void);
! 149: void neigh_prune(void);
! 150: void neigh_if_up(struct iface *);
! 151: void neigh_if_down(struct iface *);
! 152: void neigh_if_link(struct iface *);
! 153: void neigh_ifa_update(struct ifa *);
! 154: void neigh_init(struct pool *);
! 155:
! 156: /*
! 157: * Interface Pattern Lists
! 158: */
! 159:
! 160: struct iface_patt_node {
! 161: node n;
! 162: int positive;
! 163: byte *pattern;
! 164: net_addr prefix;
! 165: };
! 166:
! 167: struct iface_patt {
! 168: node n;
! 169: list ipn_list; /* A list of struct iface_patt_node */
! 170:
! 171: /* Protocol-specific data follow after this structure */
! 172: };
! 173:
! 174: int iface_patt_match(struct iface_patt *ifp, struct iface *i, struct ifa *a);
! 175: struct iface_patt *iface_patt_find(list *l, struct iface *i, struct ifa *a);
! 176: int iface_patts_equal(list *, list *, int (*)(struct iface_patt *, struct iface_patt *));
! 177:
! 178:
! 179: u32 if_choose_router_id(struct iface_patt *mask, u32 old_id);
! 180:
! 181: #endif
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