route.h

/*
Copyright (c) 2007 by Juliusz Chroboczek

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/

struct route {
    struct source *src;
    unsigned short metric;
    unsigned short refmetric;
    unsigned short seqno;
    struct neighbour *neigh;
    unsigned char nexthop[16];
    int time;
    int origtime;
    int installed;
};

extern struct route routes[MAXROUTES];
extern int numroutes;
extern int kernel_metric;
extern int route_timeout_delay;
extern int route_gc_delay;

struct route *find_route(const unsigned char *prefix, unsigned char plen,
                         struct neighbour *neigh, const unsigned char *nexthop);
struct route *find_installed_route(const unsigned char *prefix,
                                   unsigned char plen);
void flush_route(struct route *route);
void flush_neighbour_routes(struct neighbour *neigh);
void flush_network_routes(struct network *net);
unsigned int metric_to_kernel(int metric);
void install_route(struct route *route);
void uninstall_route(struct route *route);
void change_route(struct route *old, struct route *new);
void change_route_metric(struct route *route, int newmetric);
int route_feasible(struct route *route);
int update_feasible(const unsigned char *a,
                    const unsigned char *p, unsigned char plen,
                    unsigned short seqno, unsigned short refmetric);
struct route *find_best_route(const unsigned char *prefix, unsigned char plen);
struct route *install_best_route(const unsigned char prefix[16],
                                 unsigned char plen);
void update_neighbour_metric(struct neighbour *neigh);
void update_route_metric(struct route *route);
struct route *update_route(const unsigned char *a,
                           const unsigned char *p, unsigned char plen,
                           unsigned short seqno, unsigned short refmetric,
                           struct neighbour *neigh,
                           const unsigned char *nexthop);
void consider_route(struct route *route);
void send_triggered_update(struct route *route,
                           struct source *oldsrc, int oldmetric);
void trigger_route_change(struct route *route,
                          struct source *oldsrc, unsigned short oldmetric);
void route_lost(struct source *src, int oldmetric);
void expire_routes(void);