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

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

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

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

Change to simulator arguments for readability

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

* Let one argument be optional
* Disable ipv6 for whole namespace once
* Python 2/3 compatibility fix
Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>