Commit df77fe4d authored by Ido Schimmel's avatar Ido Schimmel Committed by David S. Miller
Browse files

ipv6: fib: Add in-kernel notifications for route add / delete 



As with IPv4, allow listeners of the FIB notification chain to receive
notifications whenever a route is added, replaced or deleted. This is
done by placing calls to the FIB notification chain in the two lowest
level functions that end up performing these operations - namely,
fib6_add_rt2node() and fib6_del_route().

Unlike IPv4, APPEND notifications aren't sent as the kernel doesn't
distinguish between "append" (NLM_F_CREATE|NLM_F_APPEND) and "prepend"
(NLM_F_CREATE). If NLM_F_EXCL isn't set, duplicate routes are always
added after the existing duplicate routes.

Signed-off-by: default avatarIdo Schimmel <idosch@mellanox.com>
Signed-off-by: default avatarJiri Pirko <jiri@mellanox.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 16ab6d7d

include/net/ip6_fib.h

+5 −0
Original line number Diff line number Diff line
@@ -258,6 +258,11 @@ typedef struct rt6_info *(*pol_lookup_t)(struct net *, 
					 struct fib6_table *,

					 struct flowi6 *, int);



struct fib6_entry_notifier_info {

	struct fib_notifier_info info; /* must be first */

	struct rt6_info *rt;

};



/*

 *	exported functions

 */

net/ipv6/ip6_fib.c

+17 −0
Original line number Diff line number Diff line
@@ -33,6 +33,7 @@ 
#include <net/ndisc.h>

#include <net/addrconf.h>

#include <net/lwtunnel.h>

#include <net/fib_notifier.h>



#include <net/ip6_fib.h>

#include <net/ip6_route.h>
@@ -302,6 +303,17 @@ static void __net_init fib6_tables_init(struct net *net) 


#endif



static int call_fib6_entry_notifiers(struct net *net,

				     enum fib_event_type event_type,

				     struct rt6_info *rt)

{

	struct fib6_entry_notifier_info info = {

		.rt = rt,

	};



	return call_fib6_notifiers(net, event_type, &info.info);

}



static int fib6_dump_node(struct fib6_walker *w)

{

	int res;
@@ -879,6 +891,8 @@ add: 
		*ins = rt;

		rt->rt6i_node = fn;

		atomic_inc(&rt->rt6i_ref);

		call_fib6_entry_notifiers(info->nl_net, FIB_EVENT_ENTRY_ADD,

					  rt);

		if (!info->skip_notify)

			inet6_rt_notify(RTM_NEWROUTE, rt, info, nlflags);

		info->nl_net->ipv6.rt6_stats->fib_rt_entries++;
@@ -906,6 +920,8 @@ add: 
		rt->rt6i_node = fn;

		rt->dst.rt6_next = iter->dst.rt6_next;

		atomic_inc(&rt->rt6i_ref);

		call_fib6_entry_notifiers(info->nl_net, FIB_EVENT_ENTRY_REPLACE,

					  rt);

		if (!info->skip_notify)

			inet6_rt_notify(RTM_NEWROUTE, rt, info, NLM_F_REPLACE);

		if (!(fn->fn_flags & RTN_RTINFO)) {
@@ -1459,6 +1475,7 @@ static void fib6_del_route(struct fib6_node *fn, struct rt6_info **rtp, 


	fib6_purge_rt(rt, fn, net);



	call_fib6_entry_notifiers(net, FIB_EVENT_ENTRY_DEL, rt);

	if (!info->skip_notify)

		inet6_rt_notify(RTM_DELROUTE, rt, info, 0);

	rt6_release(rt);

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