net: IP6 defrag: use rbtrees in nf_conntrack_reasm.c

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Currently, IPv6 defragmentation code drops non-last fragments that
are smaller than 1280 bytes: see
commit 0ed4229b08 ("ipv6: defrag: drop non-last frags smaller than min mtu")

This behavior is not specified in IPv6 RFCs and appears to break
compatibility with some IPv6 implemenations, as reported here:
https://www.spinics.net/lists/netdev/msg543846.html

This patch re-uses common IP defragmentation queueing and reassembly
code in IP6 defragmentation in nf_conntrack, removing the 1280 byte
restriction.

Signed-off-by: Peter Oskolkov <posk@google.com>
Reported-by: Tom Herbert <tom@herbertland.com>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

...

This commit is contained in:

Peter Oskolkov 2019-01-22 10:02:52 -08:00 • committed by David S. Miller

parent d4289fcc9b

commit 997dd96471

1 changed files with 71 additions and 189 deletions

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net/ipv6/netfilter/nf_conntrack_reasm.c

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