Eric Dumazet aee636c480 bpf: do not use reciprocal divide ...

At first Jakub Zawadzki noticed that some divisions by reciprocal_divide
were not correct. (off by one in some cases)
http://www.wireshark.org/~darkjames/reciprocal-buggy.c

He could also show this with BPF:
http://www.wireshark.org/~darkjames/set-and-dump-filter-k-bug.c

The reciprocal divide in linux kernel is not generic enough,
lets remove its use in BPF, as it is not worth the pain with
current cpus.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Jakub Zawadzki <darkjames-ws@darkjames.pl>
Cc: Mircea Gherzan <mgherzan@gmail.com>
Cc: Daniel Borkmann <dxchgb@gmail.com>
Cc: Hannes Frederic Sowa <hannes@stressinduktion.org>
Cc: Matt Evans <matt@ozlabs.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

2014-01-15 17:02:08 -08:00

..

datagram.c

net, datagram: fix the incorrect comment in zerocopy_sg_from_iovec()

2013-10-29 00:19:04 -04:00

dev_addr_lists.c

net, mc: fix the incorrect comments in two mc-related functions

2013-10-29 00:19:05 -04:00

dev_ioctl.c

…

dev.c

net: core: explicitly select a txq before doing l2 forwarding

2014-01-10 13:23:08 -05:00

drop_monitor.c

net: drop_monitor: fix the value of maxattr

2013-12-09 21:10:38 -05:00

dst.c

…

ethtool.c

net: Add layer 2 hardware acceleration operations for macvlan devices

2013-11-07 19:11:41 -05:00

fib_rules.c

net: Fix "ip rule delete table 256"

2013-11-08 14:53:10 -05:00

filter.c

bpf: do not use reciprocal divide

2014-01-15 17:02:08 -08:00

flow_dissector.c

net: core: explicitly select a txq before doing l2 forwarding

2014-01-10 13:23:08 -05:00

flow.c

…

gen_estimator.c

…

gen_stats.c

…

iovec.c

net: rework recvmsg handler msg_name and msg_namelen logic

2013-11-20 21:52:30 -05:00

link_watch.c

…

Makefile

…

neighbour.c

vlan: Fix header ops passthru when doing TX VLAN offload.

2013-12-31 16:23:35 -05:00

net_namespace.c

userns: Kill nsown_capable it makes the wrong thing easy

2013-08-30 23:44:11 -07:00

net-procfs.c

…

net-sysfs.c

Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next

2013-11-13 17:40:34 +09:00

net-sysfs.h

…

net-traces.c

…

netevent.c

…

netpoll.c

net: core: explicitly select a txq before doing l2 forwarding

2014-01-10 13:23:08 -05:00

netprio_cgroup.c

cgroup: netprio: remove unnecessary task_netprioidx

2013-10-08 16:27:34 -04:00

pktgen.c

{pktgen, xfrm} Update IPv4 header total len and checksum after tranformation

2013-12-01 20:33:52 -05:00

request_sock.c

…

rtnetlink.c

net: fix rtnl notification in atomic context

2013-10-25 19:03:45 -04:00

scm.c

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace

2013-09-07 14:35:32 -07:00

secure_seq.c

Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net

2013-10-23 16:49:34 -04:00

skbuff.c

net: clear local_df when passing skb between namespaces

2013-12-05 23:42:38 -05:00

sock_diag.c

…

sock.c

net: unix: allow set_peek_off to fail

2013-12-10 21:45:15 -05:00

stream.c

…

sysctl_net_core.c

…

timestamping.c

…

user_dma.c

…

utils.c

net: make net_get_random_once irq safe

2013-10-25 19:03:39 -04:00