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ipv6: introduce a new function fib6_update_sernum()

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This function takes a route as input and tries to update the sernum in
the fib6_node this route is associated with. It will be used in later
commit when adding a cached route into the exception table under that
route.

Signed-off-by: Wei Wang <weiwan@google.com>
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Wei Wang 2017-10-06 12:05:56 -07:00 committed by David S. Miller
parent 0d7b70e836
commit 180ca444b9
2 changed files with 16 additions and 0 deletions
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2
include/net/ip6_fib.h
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@ -358,6 +358,8 @@ void __net_exit fib6_notifier_exit(struct net *net);
unsigned int fib6_tables_seq_read(struct net *net);
int fib6_tables_dump(struct net *net, struct notifier_block *nb);
void fib6_update_sernum(struct rt6_info *rt);
#ifdef CONFIG_IPV6_MULTIPLE_TABLES
int fib6_rules_init(void);
void fib6_rules_cleanup(void);

14
net/ipv6/ip6_fib.c
View File

@ -110,6 +110,20 @@ enum {
FIB6_NO_SERNUM_CHANGE = 0,
};
void fib6_update_sernum(struct rt6_info *rt)
{
struct fib6_table *table = rt->rt6i_table;
struct net *net = dev_net(rt->dst.dev);
struct fib6_node *fn;
write_lock_bh(&table->tb6_lock);
fn = rcu_dereference_protected(rt->rt6i_node,
lockdep_is_held(&table->tb6_lock));
if (fn)
fn->fn_sernum = fib6_new_sernum(net);
write_unlock_bh(&table->tb6_lock);
}
/*
* Auxiliary address test functions for the radix tree.
*