diff mbox series

[net-next,01/16] ipv6: introduce a new function fib6_update_sernum()

Message ID 20171006190611.110633-2-tracywwnj@gmail.com
State Accepted, archived
Delegated to: David Miller
Headers show
Series ipv6: replace rwlock with rcu and spinlock in fib6 table | expand

Commit Message

Wei Wang Oct. 6, 2017, 7:05 p.m. UTC 
From: Wei Wang <weiwan@google.com>

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>
---
 include/net/ip6_fib.h |  2 ++
 net/ipv6/ip6_fib.c    | 14 ++++++++++++++
 2 files changed, 16 insertions(+)
diff mbox series

Patch

diff --git a/include/net/ip6_fib.h b/include/net/ip6_fib.h
index d060d711a624..152b7b14a5a5 100644
--- a/include/net/ip6_fib.h
+++ b/include/net/ip6_fib.h
@@ -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);
diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c
index e5308d7cbd75..0ba4fbb2f855 100644
--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c
@@ -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.
  *