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Setting a value bigger than 255 resulted in using only the lower eight
bits of that value as it is assigned to the u8 header field. To avoid
this unexpected result, reject such values.
Setting a value of zero is technically possible, but hosts receiving
such a packet have to treat it like hop_limit was set to one, according
to RFC2460. Therefore I don't see a use-case for that.
Setting a route's hop_limit to zero in iproute2 means to use the sysctl
default, which is not the case here: Setting e.g.
net.conf.eth0.hop_limit=0 will not make the kernel use
net.conf.all.hop_limit for outgoing packets on eth0. To avoid these
kinds of confusion, reject zero.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: David S. Miller <davem@davemloft.net>
d6df198d92