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For many reasons, it's handy to assign a contiguous range of integers to known net_addr values. This is a data structure keeping this mapping.
56 lines
2.0 KiB
C
56 lines
2.0 KiB
C
/*
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* BIRD Internet Routing Daemon -- Semi-global index of nets
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*
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* (c) 2023 Maria Matejka <mq@jmq.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_LIB_NETINDEX_H_
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#define _BIRD_LIB_NETINDEX_H_
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#include "lib/bitmap.h"
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#include "lib/hash.h"
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#include "lib/lockfree.h"
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#include "lib/net.h"
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#include "lib/resource.h"
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/* Index object */
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struct netindex {
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struct netindex *next; /* Next in hash chain */
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u32 hash; /* Cached hash value */
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u32 index; /* Assigned index */
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struct lfuc uc; /* Atomic usecount */
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net_addr addr[0]; /* The net itself (one) */
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};
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/* Index hash: data structure completely opaque, use handlers */
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typedef union netindex_hash netindex_hash;
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/* Initialization */
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netindex_hash *netindex_hash_new(pool *);
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/* Find/get/resolve index and allocate its usecount to the given pool */
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struct netindex *net_find_index_persistent(netindex_hash *, const net_addr *, pool *);
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struct netindex *net_get_index_persistent(netindex_hash *, const net_addr *, pool *);
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struct netindex *net_resolve_index_persistent(netindex_hash *, u8, u32, pool *);
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/* Find/get/resolve index; pointer valid until end of task */
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static inline struct netindex *net_find_index(netindex_hash *h, const net_addr *n)
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{ return net_find_index_persistent(h, n, tmp_res.pool); }
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static inline struct netindex *net_get_index(netindex_hash *h, const net_addr *n)
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{ return net_get_index_persistent(h, n, tmp_res.pool); }
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static inline struct netindex *net_resolve_index(netindex_hash *h, u8 net_type, u32 index)
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{ return net_resolve_index_persistent(h, net_type, index, tmp_res.pool); }
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/* Update use-count without allocating a handle. Take same care
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* to ensure that your locks and unlocks are always balanced. */
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void net_lock_index(netindex_hash *h, struct netindex *i);
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void net_unlock_index(netindex_hash *h, struct netindex *i);
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/* Retrieve the index from its addr pointer */
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#define NET_TO_INDEX(a) \
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SKIP_BACK(struct netindex, addr, TYPE_CAST(net_addr *, net_addr (*)[0], a))
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#endif //_BIRD_LIB_NETINDEX_H_
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