Add rib_lookup_info() to provide API for retrieving individual route

  entries data in unified format.

There are control plane functions that require information other than
  just next-hop data (e.g. individual rtentry fields like flags or
  prefix/mask). Given that the goal is to avoid rte reference/refcounting,
  re-use rt_addrinfo structure to store most rte fields. If caller wants
  to retrieve key/mask or gateway (which are sockaddrs and are allocated
  separately), it needs to provide sufficient-sized sockaddrs structures
  w/ ther pointers saved in passed rt_addrinfo.

Convert:
  * lltable new records checks (in_lltable_rtcheck(),
    nd6_is_new_addr_neighbor().
  * rtsock pre-add/change route check.
  * IPv6 NS ND-proxy check (RADIX_MPATH code was eliminated because
     1) we don't support RTF_ANNOUNCE ND-proxy for networks and there should
       not be multiple host routes for such hosts 2) if we have multiple
       routes we should inspect them (which is not done). 3) the entire idea
       of abusing KRT as storage for ND proxy seems odd. Userland programs
       should be used for that purpose).

1 files changed, 6 insertions, 0 deletions

diff --git a/sys/net/route.h b/sys/net/route.h
index 847722c..7c69e1c 100644
--- a/sys/net/route.h
+++ b/sys/net/route.h
@@ -197,6 +197,9 @@ struct rtentry {
 #define	NHR_IFAIF		0x01	/* Return ifa_ifp interface */
 #define	NHR_REF			0x02	/* For future use */
 
+/* Control plane route request flags */
+#define	NHR_COPY		0x100	/* Copy rte data */
+
 /* rte<>nhop translation */
 static inline uint16_t
 fib_rte_to_nh_flags(int rt_flags)
@@ -460,6 +463,9 @@ void	 rtredirect_fib(struct sockaddr *, struct sockaddr *,
 int	 rtrequest_fib(int, struct sockaddr *,
 	    struct sockaddr *, struct sockaddr *, int, struct rtentry **, u_int);
 int	 rtrequest1_fib(int, struct rt_addrinfo *, struct rtentry **, u_int);
+int	rib_lookup_info(uint32_t, const struct sockaddr *, uint32_t, uint32_t,
+	    struct rt_addrinfo *);
+void	rib_free_info(struct rt_addrinfo *info);
 
 #include <sys/eventhandler.h>
 typedef void (*rtevent_redirect_fn)(void *, struct rtentry *, struct rtentry *, struct sockaddr *);