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Hannes Frederic Sowa 1280938465 inet: limit length of fragment queue hash table bucket lists 
[ Upstream commit 5a3da1fe95 ]

This patch introduces a constant limit of the fragment queue hash
table bucket list lengths. Currently the limit 128 is choosen somewhat
arbitrary and just ensures that we can fill up the fragment cache with
empty packets up to the default ip_frag_high_thresh limits. It should
just protect from list iteration eating considerable amounts of cpu.

If we reach the maximum length in one hash bucket a warning is printed.
This is implemented on the caller side of inet_frag_find to distinguish
between the different users of inet_fragment.c.

I dropped the out of memory warning in the ipv4 fragment lookup path,
because we already get a warning by the slab allocator.

Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Jesper Dangaard Brouer <jbrouer@redhat.com>
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-03-28 12:11:54 -07:00
..
acpi Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux 2012-05-05 10:06:06 -07:00
asm-generic mm: limit mmu_gather batching to fix soft lockups on !CONFIG_PREEMPT 2013-01-11 09:07:18 -08:00
crypto
drm drm/radeon: add new SI pci id 2012-12-03 11:47:01 -08:00
keys
linux tcp: fix skb_availroom() 2013-03-28 12:11:53 -07:00
math-emu
media Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media 2012-05-14 11:23:37 -07:00
misc
mtd
net inet: limit length of fragment queue hash table bucket lists 2013-03-28 12:11:54 -07:00
pcmcia
rdma infiniband: pass rdma_cm module to netlink_dump_start 2012-10-28 10:14:15 -07:00
rxrpc
scsi SCSI: libsas: fix taskfile corruption in sas_ata_qc_fill_rtf 2012-07-16 09:04:37 -07:00
sound ALSA: Add a reference counter to card instance 2012-11-17 13:16:13 -08:00
target target: Add link_magic for fabric allow_link destination target_items 2013-01-21 11:45:24 -08:00
trace xen/mmu: Use Xen specific TLB flush instead of the generic one. 2012-11-17 13:15:54 -08:00
video atmel_lcdfb: fix 16-bpp modes on older SOCs 2013-03-20 13:05:00 -07:00
xen xen/m2p: do not reuse kmap_op->dev_bus_addr 2012-10-02 10:30:06 -07:00
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