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Commit 982f56f3 authored by YOSHIFUJI Hideaki's avatar YOSHIFUJI Hideaki Committed by David S. Miller
Browse files

[IPV6] ROUTE: Search subtree when backtracking. 



Based on MIPL2 kernel patch.

Signed-off-by: default avatarYOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: default avatarVille Nuorvala <vnuorval@tcs.hut.fi>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 7fc33165

net/ipv6/route.c

+18 −12
Original line number Diff line number Diff line
@@ -481,17 +481,23 @@ int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, 
}

#endif



#define BACKTRACK() \

if (rt == &ip6_null_entry && flags & RT6_F_STRICT) { \

	while ((fn = fn->parent) != NULL) { \

		if (fn->fn_flags & RTN_TL_ROOT) { \

			dst_hold(&rt->u.dst); \

#define BACKTRACK(saddr) \

do { \

	if (rt == &ip6_null_entry) { \

		struct fib6_node *pn; \

		while (fn) { \

			if (fn->fn_flags & RTN_TL_ROOT) \

				goto out; \

		} \

			pn = fn->parent; \

			if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \

				fn = fib6_lookup(pn->subtree, NULL, saddr); \

			else \

				fn = pn; \

			if (fn->fn_flags & RTN_RTINFO) \

				goto restart; \

		} \

}

	} \

} while(0)



static struct rt6_info *ip6_pol_route_lookup(struct fib6_table *table,

					     struct flowi *fl, int flags)
@@ -504,7 +510,7 @@ static struct rt6_info *ip6_pol_route_lookup(struct fib6_table *table, 
restart:

	rt = fn->leaf;

	rt = rt6_device_match(rt, fl->oif, flags & RT6_F_STRICT);

	BACKTRACK();

	BACKTRACK(&fl->fl6_src);

	dst_hold(&rt->u.dst);

out:

	read_unlock_bh(&table->tb6_lock);
@@ -638,7 +644,7 @@ static struct rt6_info *ip6_pol_route_input(struct fib6_table *table, 


restart:

	rt = rt6_select(&fn->leaf, fl->iif, strict | reachable);

	BACKTRACK();

	BACKTRACK(&fl->fl6_src);

	if (rt == &ip6_null_entry ||

	    rt->rt6i_flags & RTF_CACHE)

		goto out;
@@ -733,7 +739,7 @@ static struct rt6_info *ip6_pol_route_output(struct fib6_table *table, 


restart:

	rt = rt6_select(&fn->leaf, fl->oif, strict | reachable);

	BACKTRACK();

	BACKTRACK(&fl->fl6_src);

	if (rt == &ip6_null_entry ||

	    rt->rt6i_flags & RTF_CACHE)

		goto out;