Added some new protocol hooks (look at the comments for better explanation):

  unsigned core_state;			/* Core state machine (see below) */

  unsigned core_goal;			/* State we want to reach (see below) */

  /*

   *	General protocol hooks:

   *

   *	   if_notify	Notify protocol about interface state changes.

   *	   rt_notify	Notify protocol about routing table updates.

   *	   neigh_notify	Notify protocol about neighbor cache events.

   *	   make_tmp_attrs  Construct ea_list from private attrs stored in rte.

   *	   store_tmp_attrs Store private attrs back to the rte.

   *	   import_control  Called as the first step of the route importing process.

   *			It can construct a new rte, add private attributes and

   *			decide whether the route shall be imported: 1=yes, -1=no,

   *			0=process it through the import filter set by the user.

   */

  void (*if_notify)(struct proto *, unsigned flags, struct iface *new, struct iface *old);

  void (*rt_notify)(struct proto *, struct network *net, struct rte *new, struct rte *old);

  void (*neigh_notify)(struct neighbor *neigh);

  struct ea_list *(*make_tmp_attrs)(struct rte *rt, struct linpool *pool);

  void (*store_tmp_attrs)(struct rte *rt, struct ea_list *attrs);

  int (*import_control)(struct proto *, struct rte **rt, struct ea_list **attrs, struct linpool *pool);

  /*

   *	Routing entry hooks (called only for rte's belonging to this protocol):

   *

   *	   rte_better	Compare two rte's and decide which one is better (1=first, 0=second).

   *	   rte_insert	Called whenever a rte is inserted to a routing table.

   *	   rte_remove	Called whenever a rte is removed from the routing table.

   */

  int (*rte_better)(struct rte *, struct rte *);

  void (*rte_insert)(struct network *, struct rte *);