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ipv6: use RCU in inet6_csk_xmit() 

Use RCU to avoid changing dst_entry refcount in fast path.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2011-07-28 03:43:47 +00:00 committed by David S. Miller
parent cfdf76474e
commit d14730b8e9
1 changed files with 6 additions and 3 deletions
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9
net/ipv6/inet6_connection_sock.c
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@ -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);