ipv4: properly refresh rtable entries on pmtu/redirect events
This reverts commit 05ab86c5 (xfrm4: Invalidate all ipv4 routes on IPsec pmtu events). Flushing all cached entries is not needed. Instead, invalidate only the related next hop dsts to recheck for the added next hop exception where needed. This also fixes a subtle race due to bumping generation id's before updating the pmtu. Cc: Steffen Klassert <steffen.klassert@secunet.com> Signed-off-by:Timo Teräs <timo.teras@iki.fi> Signed-off-by:
David S. Miller <davem@davemloft.net>
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