Move helper.h prototype for tail call into 4.2 section

With #115, bpf_tail_call was incorrectly disabled in 4.2 builds.
Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

Add INSTALL.md instructions for using Ubuntu binary build

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

Flags for 4.3 were accidentally committed, revert

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

release IPDB in host ns early

We need it for setting vxlan flow based flags currently. Release
it once the interfaces are set up. This does not help Ctrl-C on
main.py though.
Signed-off-by: Wei-Chun Chao <weichunc@plumgrid.com>

Suggest Release and add X86 target in readme

The default CMAKE_BUILD_TYPE is Debug when cloning from git, suggest
Release instead.

Also, there are some worrisome warnings during cmake when X86 target is
omitted. Additionally, I may want X86 target support for a future
feature, so lets suggest it here.
Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

llvm 3.7+ deb is broken

https://llvm.org/bugs/show_bug.cgi?id=24154

Build from source until it's resolved. Another plan is to provide
binary package.
Signed-off-by: Wei-Chun Chao <weichunc@plumgrid.com>

better clean up of created namespace/interfaces if ctrl-c is pressed

fix tunnel_mesh.py

The IP assignment was wrong.
Signed-off-by: Wei-Chun Chao <weichunc@plumgrid.com>

  o There are still some cases when ctrl-c is pressed, the program does not exit
    gracefully, with a however lower probability. In my random manual experiments,
    one in ten cases it still hangs and needs further ctrl-z.
Signed-off-by: Yonghong Song <yhs@plumgrid.com>

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>