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Commit d14730b8 authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller
Browse files

ipv6: use RCU in inet6_csk_xmit() 



Use RCU to avoid changing dst_entry refcount in fast path.

Signed-off-by: default avatarEric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent cfdf7647

net/ipv6/inet6_connection_sock.c

+6 −3
Original line number Diff line number Diff line
@@ -211,6 +211,7 @@ int inet6_csk_xmit(struct sk_buff *skb, struct flowi *fl_unused) 
	struct flowi6 fl6;

	struct dst_entry *dst;

	struct in6_addr *final_p, final;

	int res;



	memset(&fl6, 0, sizeof(fl6));

	fl6.flowi6_proto = sk->sk_protocol;
@@ -241,12 +242,14 @@ int inet6_csk_xmit(struct sk_buff *skb, struct flowi *fl_unused) 
		__inet6_csk_dst_store(sk, dst, NULL, NULL);

	}



	skb_dst_set(skb, dst_clone(dst));

	rcu_read_lock();

	skb_dst_set_noref(skb, dst);



	/* Restore final destination back after routing done */

	ipv6_addr_copy(&fl6.daddr, &np->daddr);



	return ip6_xmit(sk, skb, &fl6, np->opt);

	res = ip6_xmit(sk, skb, &fl6, np->opt);

	rcu_read_unlock();

	return res;

}



EXPORT_SYMBOL_GPL(inet6_csk_xmit);