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authorDavid S. Miller <davem@davemloft.net>2012-06-17 19:47:34 -0700
committerDavid S. Miller <davem@davemloft.net>2012-06-17 19:47:34 -0700
commit6fac262526ee91ee66210b8919a4297dcf7d544e (patch)
treeb013fa21c5a0940523c431cf6041b1d7aa509dfe /net/ipv4/fib_semantics.c
parenta7e2eaadd0edf6d71637c0d99aca404b0da8c1be (diff)
ipv4: Cap ADVMSS metric in the FIB rather than the routing cache.
It makes no sense to execute this limit test every time we create a routing cache entry. We can't simply error out on these things since we've silently accepted and truncated them forever. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/fib_semantics.c')
-rw-r--r--net/ipv4/fib_semantics.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c
index e5b7182fa09..415f8230fc8 100644
--- a/net/ipv4/fib_semantics.c
+++ b/net/ipv4/fib_semantics.c
@@ -779,9 +779,14 @@ struct fib_info *fib_create_info(struct fib_config *cfg)
int type = nla_type(nla);
if (type) {
+ u32 val;
+
if (type > RTAX_MAX)
goto err_inval;
- fi->fib_metrics[type - 1] = nla_get_u32(nla);
+ val = nla_get_u32(nla);
+ if (type == RTAX_ADVMSS && val > 65535 - 40)
+ val = 65535 - 40;
+ fi->fib_metrics[type - 1] = val;
}
}
}