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Implements hostcache and recursive next hops.

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Hostcache is a structure for monitoring changes in a routing table that
is used for routes with dynamic/recursive next hops. This is needed for
proper iBGP next hop handling.
This commit is contained in:
Ondrej Zajicek
2010-07-05 17:50:19 +02:00
parent 824de84d48
commit cfe34a316e
14 changed files with 512 additions and 82 deletions
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45
nest/route.h
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@@ -129,14 +129,19 @@ typedef struct rtable {
list hooks; /* List of announcement hooks */
int pipe_busy; /* Pipe loop detection */
int use_count; /* Number of protocols using this table */
struct hostcache *hostcache;
struct rtable_config *config; /* Configuration of this table */
struct config *deleted; /* Table doesn't exist in current configuration,
* delete as soon as use_count becomes 0 and remove
* obstacle from this routing table.
*/
struct event *gc_event; /* Garbage collector event */
struct event *rt_event; /* Routing table event */
int gc_counter; /* Number of operations since last GC */
bird_clock_t gc_time; /* Time of last GC */
byte gc_scheduled; /* GC is scheduled */
byte hcu_scheduled; /* Hostcache update is scheduled */
byte nhu_state; /* Next Hop Update state */
struct fib_iterator nhu_fit; /* Next Hop Update FIB iterator */
} rtable;
typedef struct network {
@@ -144,6 +149,23 @@ typedef struct network {
struct rte *routes; /* Available routes for this network */
} net;
struct hostcache {
struct fib htable;
list hostentries;
byte update_hostcache;
};
struct hostentry {
struct fib_node fn;
node ln;
unsigned uc; /* Use count */
struct iface *iface; /* Chosen outgoing interface */
ip_addr gw; /* Chosen next hop */
byte dest; /* Chosen route destination type (RTD_...) */
byte pxlen; /* Pxlen from net that matches route */
struct rtable *tab;
};
typedef struct rte {
struct rte *next;
net *net; /* Network this RTE belongs to */
@@ -207,7 +229,6 @@ void rt_dump(rtable *);
void rt_dump_all(void);
int rt_feed_baby(struct proto *p);
void rt_feed_baby_abort(struct proto *p);
void rt_prune(rtable *tab);
void rt_prune_all(void);
struct rtable_config *rt_new_table(struct symbol *s);
@@ -248,6 +269,7 @@ typedef struct rta {
u16 hash_key; /* Hash over important fields */
ip_addr gw; /* Next hop */
ip_addr from; /* Advertising router */
struct hostentry *hostentry; /* Hostentry for recursive next-hops */
struct iface *iface; /* Outgoing interface */
struct ea_list *eattrs; /* Extended Attribute chain */
} rta;
@@ -357,6 +379,25 @@ static inline void rta_free(rta *r) { if (r && !--r->uc) rta__free(r); }
void rta_dump(rta *);
void rta_dump_all(void);
void rta_show(struct cli *, rta *, ea_list *);
void rta_set_recursive_next_hop(rtable *dep, rta *a, rtable *tab, ip_addr *gw);
/*
* rta_set_recursive_next_hop() acquires hostentry from hostcache and
* fills rta->hostentry field. New hostentry has zero use
* count. Cached rta locks its hostentry (increases its use count),
* uncached rta does not lock it. Hostentry with zero use count is
* removed asynchronously during host cache update, therefore it is
* safe to hold such hostentry temorarily. There is no need to hold
* a lock for hostentry->dep table, because that table contains routes
* responsible for that hostentry, and therefore is non-empty if given
* hostentry has non-zero use count. The protocol responsible for routes
* with recursive next hops should also hold a lock for a table governing
* that routes (argument tab to rta_set_recursive_next_hop()).
*/
static inline void rt_lock_hostentry(struct hostentry *he) { if (he) he->uc++; }
static inline void rt_unlock_hostentry(struct hostentry *he) { if (he) he->uc--; }
extern struct protocol *attr_class_to_protocol[EAP_MAX];