Reorganize bpf_module into multiple frontend implementations

Add project logo and source files

Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

The logo contains elements which are in public domain. The gear
has been modified from illustration submitted by 'hank0071' on
OpenClipart and the font used is Open Sans. There seems to be no
restriction on commercial use.
Signed-off-by: Suchakra Sharma <suchakrapani.sharma@polymtl.ca>

Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

Other commits to follow with cleanup of the code itself.
Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

Enable memory cleanup in Clang, otherwise 500KB lost per compile

Since it is meant for the command line, clang ships with no memory
cleanup. We intend to run as a long-lived process, so enable that
cleanup. Valgrind now reports only trivial (and non-increasing over
time) memory leaks.
Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

Add version check for functions only in >= 4.3 kernel

Add pkg-config support and include compat/linux* in packaging

Different kernel header versions has been a continuing source of pain.
Though I don't prefer this approach, it seems the most reliable way to
get a build (for the time being) is to bundle the linux/bpf*.h in a
compat directory in the target install location.

To get visibility into that compat directory from another library, one
will need to rely on pkg-config --cflags argument to pull in that compat
directory.

Future work will be to avoid bundling the compat directory if the
version of linux-libc-dev is high enough, or if the presence of the
result of 'make headers_install' from the running kernel can be
detected.
Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

Addresses issue #100

Note to developers working off of net-next: you will need to locally
disable this patch to make use of the new features.
Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

Assign ip address to br

Signed-off-by: Wei-Chun Chao <weichunc@plumgrid.com>

fix incorrect DataLayout

Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>

update tunnel_key prototypes

Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>

Add option for custom log string to bpf_prog_load

bpf_prog_load was unconditionally printing the error from the kernel to
stderr. If libbpf is used in a library, that library may want to collect
the error to a custom location (a logfile). So, provide an option to
store the string elsewhere than stderr.
Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

import "input" from "builtins" for python v2/v3 compatibility

Signed-off-by: Yonghong Song <yhs@plumgrid.com>

full mesh vxlan example without multicast

Run 'sudo python ./main.py mesh'
Signed-off-by: Wei-Chun Chao <weichunc@plumgrid.com>

Dist bridge

Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

* Update compat.h
* Move bpf_clone_redirect to signed int, matching the implementation.
  This allows error codes to be compared to < 0.
Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

Add index-based function references to c api

Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

* Add the index based API so that an external api (bcc-fuse) can iterate
  through the maps and functions that were compiled in this program.
* Add a more unique section prefix to disambiguate exportable functions.
Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

Include bcc headers in /usr/include

Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

* Add wrapper bcc.h to include dependencies
* Add text bpf_module_create_* to list of exports
Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

simply vlan_learning example with newer vlan_push/pop helpers

Signed-off-by: Yonghong Song <yhs@plumgrid.com>

Signed-off-by: Yonghong Song <yhs@plumgrid.com>

Cache function handles in BPF class

* This means repeated calls to get_func() are now allowed
Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

use running linux version number for feature availability checking