ipv6: defrag: drop non-last frags smaller than min mtu
authorFlorian Westphal <fw@strlen.de>
Fri, 3 Aug 2018 00:22:20 +0000 (02:22 +0200)
committerDavid S. Miller <davem@davemloft.net>
Mon, 6 Aug 2018 00:21:14 +0000 (17:21 -0700)
commit0ed4229b08c13c84a3c301a08defdc9e7f4467e6
tree25ed6930db15e9d4150afaaf7ad46467c496feb1
parentc30f1fc041b74ecdb072dd44f858750414b8b19f
ipv6: defrag: drop non-last frags smaller than min mtu

don't bother with pathological cases, they only waste cycles.
IPv6 requires a minimum MTU of 1280 so we should never see fragments
smaller than this (except last frag).

v3: don't use awkward "-offset + len"
v2: drop IPv4 part, which added same check w. IPV4_MIN_MTU (68).
    There were concerns that there could be even smaller frags
    generated by intermediate nodes, e.g. on radio networks.

Cc: Peter Oskolkov <posk@google.com>
Cc: Eric Dumazet <edumazet@google.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/ipv6/netfilter/nf_conntrack_reasm.c
net/ipv6/reassembly.c