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authorDavid S. Miller <davem@davemloft.net>2012-06-28 03:59:11 -0700
committerDavid S. Miller <davem@davemloft.net>2012-06-28 03:59:11 -0700
commit35ebf65e851c6d9731abc6362b189858eb59f4d3 (patch)
tree2e78c2c81bc72aeeb172484996cdff268f0111a2 /include/net/ip_fib.h
parent70e7341673a47fb1525cfc7d6651cc98b5348928 (diff)
ipv4: Create and use fib_compute_spec_dst() helper.
The specific destination is the host we direct unicast replies to. Usually this is the original packet source address, but if we are responding to a multicast or broadcast packet we have to use something different. Specifically we must use the source address we would use if we were to send a packet to the unicast source of the original packet. The routing cache precomputes this value, but we want to remove that precomputation because it creates a hard dependency on the expensive rpfilter source address validation which we'd like to make cheaper. There are only three places where this matters: 1) ICMP replies. 2) pktinfo CMSG 3) IP options Now there will be no real users of rt->rt_spec_dst and we can simply remove it altogether. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/ip_fib.h')
-rw-r--r--include/net/ip_fib.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/net/ip_fib.h b/include/net/ip_fib.h
index 4b347c0ca094..1687b3de54ff 100644
--- a/include/net/ip_fib.h
+++ b/include/net/ip_fib.h
@@ -230,6 +230,7 @@ extern struct fib_table *fib_get_table(struct net *net, u32 id);
/* Exported by fib_frontend.c */
extern const struct nla_policy rtm_ipv4_policy[];
extern void ip_fib_init(void);
+extern __be32 fib_compute_spec_dst(struct sk_buff *skb);
extern int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
u8 tos, int oif, struct net_device *dev,
__be32 *spec_dst, u32 *itag);