Commit 1d053da9 authored by David Ahern's avatar David Ahern Committed by Daniel Borkmann
Browse files

net/ipv6: Extract table lookup from ip6_pol_route 



ip6_pol_route is used for ingress and egress FIB lookups. Refactor it
moving the table lookup into a separate fib6_table_lookup that can be
invoked separately and export the new function.

ip6_pol_route now calls fib6_table_lookup and uses the result to generate
a dst based rt6_info.

Signed-off-by: default avatarDavid Ahern <dsahern@gmail.com>
Acked-by: default avatarDavid S. Miller <davem@davemloft.net>
Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
parent 3b290a31

include/net/ip6_fib.h

+4 −0
Original line number Diff line number Diff line
@@ -376,6 +376,10 @@ struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi6 *fl6, 
				   const struct sk_buff *skb,

				   int flags, pol_lookup_t lookup);



/* called with rcu lock held; caller needs to select path */

struct fib6_info *fib6_table_lookup(struct net *net, struct fib6_table *table,

				    int oif, struct flowi6 *fl6, int strict);



struct fib6_info *fib6_multipath_select(const struct net *net,

					struct fib6_info *match,

					struct flowi6 *fl6, int oif,

net/ipv6/route.c

+25 −14
Original line number Diff line number Diff line
@@ -1800,21 +1800,12 @@ void rt6_age_exceptions(struct fib6_info *rt, 
	rcu_read_unlock_bh();

}



struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,

			       int oif, struct flowi6 *fl6,

			       const struct sk_buff *skb, int flags)

/* must be called with rcu lock held */

struct fib6_info *fib6_table_lookup(struct net *net, struct fib6_table *table,

				    int oif, struct flowi6 *fl6, int strict)

{

	struct fib6_node *fn, *saved_fn;

	struct fib6_info *f6i;

	struct rt6_info *rt;

	int strict = 0;



	strict |= flags & RT6_LOOKUP_F_IFACE;

	strict |= flags & RT6_LOOKUP_F_IGNORE_LINKSTATE;

	if (net->ipv6.devconf_all->forwarding == 0)

		strict |= RT6_LOOKUP_F_REACHABLE;



	rcu_read_lock();



	fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);

	saved_fn = fn;
@@ -1824,8 +1815,6 @@ struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, 


redo_rt6_select:

	f6i = rt6_select(net, fn, oif, strict);

	if (f6i->fib6_nsiblings)

		f6i = fib6_multipath_select(net, f6i, fl6, oif, skb, strict);

	if (f6i == net->ipv6.fib6_null_entry) {

		fn = fib6_backtrack(fn, &fl6->saddr);

		if (fn)
@@ -1838,6 +1827,28 @@ redo_rt6_select: 
		}

	}



	return f6i;

}



struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,

			       int oif, struct flowi6 *fl6,

			       const struct sk_buff *skb, int flags)

{

	struct fib6_info *f6i;

	struct rt6_info *rt;

	int strict = 0;



	strict |= flags & RT6_LOOKUP_F_IFACE;

	strict |= flags & RT6_LOOKUP_F_IGNORE_LINKSTATE;

	if (net->ipv6.devconf_all->forwarding == 0)

		strict |= RT6_LOOKUP_F_REACHABLE;



	rcu_read_lock();



	f6i = fib6_table_lookup(net, table, oif, fl6, strict);

	if (f6i->fib6_nsiblings)

		f6i = fib6_multipath_select(net, f6i, fl6, oif, skb, strict);



	if (f6i == net->ipv6.fib6_null_entry) {

		rt = net->ipv6.ip6_null_entry;

		rcu_read_unlock();

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