[IPV6]: MTU discovery check in ip6_fragment()
Adds a check in ip6_fragment() mirroring ip_fragment() for packets that we can't fragment, and sends an ICMP Packet Too Big message in response. Signed-off-by: NJohn Heffner <jheffner@psc.edu> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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