[12/*] [IPSEC] Handle local_df in IPv4

[Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>]

Hi Dave:

When cleaning up the remaining users of dst_pmtu I noticed that
local_df wasn't being treated correctly in IPsec.  In fact, if
you socket's dst went over IPsec, local_df is essentailly ignored.

This patch fixes that.

Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>

I was going to do the same thing to IPv6.  Unfortunately it seems
that we don't have any local_df support over there.  That is, we
always fragment outbound UDP/raw packets.  Did I miss something?

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@xxxxxxxxxxxxxxxxxxx>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt

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