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This patch allows bpf programs to be passed to the C preprocessor
before handing over to bpfc. Example:
#define ETH_P_IP 0x800
ldh [12]
jne #ETH_P_IP, drop
ldb [23]
jneq #6, drop
ldh [20]
jset #0x1fff, drop
ldxb 4 * ([14] & 0xf)
ldh [x + 14]
jeq #0x16, pass
ldh [x + 16]
jne #0x16, drop
pass: ret #-1
drop: ret #0
Compile with: bpfc -i foo -p
Suggested-by: John Lange <JLange@trendium.com>
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
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In preparation for [1], add the #poff operation, so that users can
dynamically truncate packets on the payload start offset. This is
useful for several reasons: privacy, speed, ...
Example for bpfc:
ld #poff
ret a
[1] http://thread.gmane.org/gmane.linux.network/262512
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
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Add different bpf opcode pretty printer to support a variety of
output formats for netsniff-ng, xt_bpf, tcpdump, C-like and make
future integration of formats easier.
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
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We decided to get rid of the old Git history and start a new one for
several reasons:
*) Allow / enforce only high-quality commits (which was not the case
for many commits in the history), have a policy that is more close
to the one from the Linux kernel. With high quality commits, we
mean code that is logically split into commits and commit messages
that are signed-off and have a proper subject and message body.
We do not allow automatic Github merges anymore, since they are
total bullshit. However, we will either cherry-pick your patches
or pull them manually.
*) The old archive was about ~27MB for no particular good reason.
This basically derived from the bad decision that also some PDF
files where stored there. From this moment onwards, no binary
objects are allowed to be stored in this repository anymore.
The old archive is not wiped away from the Internet. You will still
be able to find it, e.g. on git.cryptoism.org etc.
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
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