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authorDavid S. Miller <davem@davemloft.net>2010-12-13 23:52:14 +0300
committerDavid S. Miller <davem@davemloft.net>2010-12-13 23:52:14 +0300
commit0dbaee3b37e118a96bb7b8eb0d9bbaeeb46264be (patch)
tree37000c5d7e663e4ae9800a7bcde9934984b8bae9 /include/net/dst_ops.h
parentcc6f02dd490dac4ad821d5077b934c9b37037cd0 (diff)
downloadlinux-0dbaee3b37e118a96bb7b8eb0d9bbaeeb46264be.tar.xz
net: Abstract default ADVMSS behind an accessor.
Make all RTAX_ADVMSS metric accesses go through a new helper function, dst_metric_advmss(). Leave the actual default metric as "zero" in the real metric slot, and compute the actual default value dynamically via a new dst_ops AF specific callback. For stacked IPSEC routes, we use the advmss of the path which preserves existing behavior. Unlike ipv4/ipv6, DecNET ties the advmss to the mtu and thus updates advmss on pmtu updates. This inconsistency in advmss handling results in more raw metric accesses than I wish we ended up with. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/dst_ops.h')
-rw-r--r--include/net/dst_ops.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/net/dst_ops.h b/include/net/dst_ops.h
index 51665b3461b8..15fb7af08c42 100644
--- a/include/net/dst_ops.h
+++ b/include/net/dst_ops.h
@@ -16,6 +16,7 @@ struct dst_ops {
int (*gc)(struct dst_ops *ops);
struct dst_entry * (*check)(struct dst_entry *, __u32 cookie);
+ unsigned int (*default_advmss)(const struct dst_entry *);
void (*destroy)(struct dst_entry *);
void (*ifdown)(struct dst_entry *,
struct net_device *dev, int how);