linux_dsm_epyc7002/samples/bpf
Alexei Starovoitov 7f67763337 bpf: introduce BPF_F_ALLOW_OVERRIDE flag
If BPF_F_ALLOW_OVERRIDE flag is used in BPF_PROG_ATTACH command
to the given cgroup the descendent cgroup will be able to override
effective bpf program that was inherited from this cgroup.
By default it's not passed, therefore override is disallowed.

Examples:
1.
prog X attached to /A with default
prog Y fails to attach to /A/B and /A/B/C
Everything under /A runs prog X

2.
prog X attached to /A with allow_override.
prog Y fails to attach to /A/B with default (non-override)
prog M attached to /A/B with allow_override.
Everything under /A/B runs prog M only.

3.
prog X attached to /A with allow_override.
prog Y fails to attach to /A with default.
The user has to detach first to switch the mode.

In the future this behavior may be extended with a chain of
non-overridable programs.

Also fix the bug where detach from cgroup where nothing is attached
was not throwing error. Return ENOENT in such case.

Add several testcases and adjust libbpf.

Fixes: 3007098494 ("cgroup: add support for eBPF programs")
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Tejun Heo <tj@kernel.org>
Acked-by: Daniel Mack <daniel@zonque.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2017-02-12 21:52:19 -05:00
..
bpf_helpers.h bpf: xdp: Add XDP example for head adjustment 2016-12-08 14:25:13 -05:00
bpf_load.c samples/bpf: Remove perf_event_open() declaration 2016-12-20 12:00:40 -03:00
bpf_load.h samples/bpf: Make samples more libbpf-centric 2016-12-15 16:25:47 -03:00
cgroup_helpers.c samples, bpf: Refactor test_current_task_under_cgroup - separate out helpers 2016-12-03 16:07:11 -05:00
cgroup_helpers.h samples, bpf: Refactor test_current_task_under_cgroup - separate out helpers 2016-12-03 16:07:11 -05:00
fds_example.c samples/bpf: Move open_raw_sock to separate header 2016-12-20 12:00:40 -03:00
lathist_kern.c bpf: BPF based latency tracing 2015-06-23 06:09:58 -07:00
lathist_user.c samples/bpf: Make samples more libbpf-centric 2016-12-15 16:25:47 -03:00
libbpf.h samples/bpf: Move open_raw_sock to separate header 2016-12-20 12:00:40 -03:00
lwt_len_hist_kern.c bpf: Add tests and samples for LWT-BPF 2016-12-02 10:52:00 -05:00
lwt_len_hist_user.c samples/bpf: Make samples more libbpf-centric 2016-12-15 16:25:47 -03:00
lwt_len_hist.sh bpf: Add tests and samples for LWT-BPF 2016-12-02 10:52:00 -05:00
Makefile Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-12-23 16:49:12 -08:00
map_perf_test_kern.c bpf: Add tests for the LRU bpf_htab 2016-11-15 11:50:43 -05:00
map_perf_test_user.c bpf: Add tests for the LRU bpf_htab 2016-11-15 11:50:43 -05:00
offwaketime_kern.c bpf, samples: don't zero data when not needed 2016-04-14 21:40:42 -04:00
offwaketime_user.c samples/bpf: Make samples more libbpf-centric 2016-12-15 16:25:47 -03:00
parse_ldabs.c bpf: fix samples to add fake KBUILD_MODNAME 2016-10-29 14:46:12 -04:00
parse_simple.c bpf: fix samples to add fake KBUILD_MODNAME 2016-10-29 14:46:12 -04:00
parse_varlen.c bpf: fix samples to add fake KBUILD_MODNAME 2016-10-29 14:46:12 -04:00
README.rst samples/bpf: Switch over to libbpf 2016-12-20 12:00:38 -03:00
sampleip_kern.c bpf/samples: Fix PT_REGS_IP on s390x and use it 2016-11-28 16:26:46 -05:00
sampleip_user.c samples/bpf: Remove perf_event_open() declaration 2016-12-20 12:00:40 -03:00
sock_example.c samples/bpf: Move open_raw_sock to separate header 2016-12-20 12:00:40 -03:00
sock_example.h samples/bpf sock_example: Avoid getting ethhdr from two includes 2016-12-27 21:49:17 -03:00
sock_flags_kern.c samples/bpf: add userspace example for prohibiting sockets 2016-12-02 13:46:09 -05:00
sockex1_kern.c samples: bpf: add skb->field examples and tests 2015-03-15 22:02:28 -04:00
sockex1_user.c samples/bpf: Move open_raw_sock to separate header 2016-12-20 12:00:40 -03:00
sockex2_kern.c samples/bpf: fix sockex2 example 2016-11-24 16:04:52 -05:00
sockex2_user.c samples/bpf: Move open_raw_sock to separate header 2016-12-20 12:00:40 -03:00
sockex3_kern.c bpf samples: fix compiler errors with sockex2 and sockex3 2016-09-27 03:48:58 -04:00
sockex3_user.c samples/bpf: Move open_raw_sock to separate header 2016-12-20 12:00:40 -03:00
spintest_kern.c samples/bpf: Enable powerpc support 2016-04-06 16:01:29 -04:00
spintest_user.c samples/bpf: Make samples more libbpf-centric 2016-12-15 16:25:47 -03:00
tc_l2_redirect_kern.c bpf: fix samples xdp_tx_iptunnel and tc_l2_redirect with fake KBUILD_MODNAME 2017-01-20 12:04:07 -05:00
tc_l2_redirect_user.c samples/bpf: Make samples more libbpf-centric 2016-12-15 16:25:47 -03:00
tc_l2_redirect.sh bpf: Add test for bpf_redirect to ipip/ip6tnl 2016-11-12 23:38:07 -05:00
tcbpf1_kern.c bpf: fix samples to add fake KBUILD_MODNAME 2016-10-29 14:46:12 -04:00
tcbpf2_kern.c bpf: fix samples to add fake KBUILD_MODNAME 2016-10-29 14:46:12 -04:00
test_cgrp2_array_pin.c samples/bpf: Make samples more libbpf-centric 2016-12-15 16:25:47 -03:00
test_cgrp2_attach2.c bpf: introduce BPF_F_ALLOW_OVERRIDE flag 2017-02-12 21:52:19 -05:00
test_cgrp2_attach.c bpf: introduce BPF_F_ALLOW_OVERRIDE flag 2017-02-12 21:52:19 -05:00
test_cgrp2_sock2.c bpf: introduce BPF_F_ALLOW_OVERRIDE flag 2017-02-12 21:52:19 -05:00
test_cgrp2_sock2.sh samples/bpf: add userspace example for prohibiting sockets 2016-12-02 13:46:09 -05:00
test_cgrp2_sock.c bpf: introduce BPF_F_ALLOW_OVERRIDE flag 2017-02-12 21:52:19 -05:00
test_cgrp2_sock.sh samples: bpf: add userspace example for modifying sk_bound_dev_if 2016-12-02 13:46:08 -05:00
test_cgrp2_tc_kern.c bpf: fix samples to add fake KBUILD_MODNAME 2016-10-29 14:46:12 -04:00
test_cgrp2_tc.sh cgroup: bpf: Add an example to do cgroup checking in BPF 2016-07-01 16:32:13 -04:00
test_cls_bpf.sh samples/bpf: add 'pointer to packet' tests 2016-05-06 16:01:54 -04:00
test_current_task_under_cgroup_kern.c samples/bpf: Add test_current_task_under_cgroup test 2016-08-12 21:49:42 -07:00
test_current_task_under_cgroup_user.c samples/bpf: Make samples more libbpf-centric 2016-12-15 16:25:47 -03:00
test_ipip.sh samples/bpf: add comprehensive ipip, ipip6, ip6ip6 test 2016-09-17 10:13:07 -04:00
test_lru_dist.c samples/bpf: Make samples more libbpf-centric 2016-12-15 16:25:47 -03:00
test_lwt_bpf.c bpf: Add tests and samples for LWT-BPF 2016-12-02 10:52:00 -05:00
test_lwt_bpf.sh bpf: Add tests and samples for LWT-BPF 2016-12-02 10:52:00 -05:00
test_overhead_kprobe_kern.c samples/bpf: add tracepoint vs kprobe performance tests 2016-04-07 21:04:27 -04:00
test_overhead_tp_kern.c samples/bpf: add tracepoint vs kprobe performance tests 2016-04-07 21:04:27 -04:00
test_overhead_user.c samples/bpf: add tracepoint vs kprobe performance tests 2016-04-07 21:04:27 -04:00
test_probe_write_user_kern.c samples/bpf: Add test/example of using bpf_probe_write_user bpf helper 2016-07-25 18:07:48 -07:00
test_probe_write_user_user.c samples/bpf: Make samples more libbpf-centric 2016-12-15 16:25:47 -03:00
test_tunnel_bpf.sh samples/bpf: extend test_tunnel_bpf.sh with IPIP test 2016-09-17 10:13:07 -04:00
trace_event_kern.c bpf/samples: Fix PT_REGS_IP on s390x and use it 2016-11-28 16:26:46 -05:00
trace_event_user.c samples/bpf: Remove perf_event_open() declaration 2016-12-20 12:00:40 -03:00
trace_output_kern.c samples/bpf: fix trace_output example 2016-04-28 17:29:45 -04:00
trace_output_user.c samples/bpf trace_output_user: Remove duplicate sys/ioctl.h include 2016-12-28 10:47:13 -03:00
tracex1_kern.c bpf, samples: don't zero data when not needed 2016-04-14 21:40:42 -04:00
tracex1_user.c samples/bpf: Add simple non-portable kprobe filter example 2015-04-02 13:25:50 +02:00
tracex2_kern.c bpf, samples: don't zero data when not needed 2016-04-14 21:40:42 -04:00
tracex2_user.c samples/bpf: Make samples more libbpf-centric 2016-12-15 16:25:47 -03:00
tracex3_kern.c samples/bpf: update tracex[23] examples to use per-cpu maps 2016-02-06 03:34:36 -05:00
tracex3_user.c samples/bpf: Make samples more libbpf-centric 2016-12-15 16:25:47 -03:00
tracex4_kern.c samples/bpf: Enable powerpc support 2016-04-06 16:01:29 -04:00
tracex4_user.c samples/bpf: Make samples more libbpf-centric 2016-12-15 16:25:47 -03:00
tracex5_kern.c bpf samples: update tracex5 sample to use __seccomp_filter 2016-09-27 03:48:58 -04:00
tracex5_user.c bpf samples: update tracex5 sample to use __seccomp_filter 2016-09-27 03:48:58 -04:00
tracex6_kern.c bpf: fix build warnings and add function read_trace_pipe() 2015-08-12 16:39:12 -07:00
tracex6_user.c samples/bpf: Remove perf_event_open() declaration 2016-12-20 12:00:40 -03:00
xdp1_kern.c bpf: make xdp sample variable names more meaningful 2016-07-20 22:07:24 -07:00
xdp1_user.c samples/bpf: Make samples more libbpf-centric 2016-12-15 16:25:47 -03:00
xdp2_kern.c bpf: make xdp sample variable names more meaningful 2016-07-20 22:07:24 -07:00
xdp_tx_iptunnel_common.h bpf: xdp: Add XDP example for head adjustment 2016-12-08 14:25:13 -05:00
xdp_tx_iptunnel_kern.c bpf: fix samples xdp_tx_iptunnel and tc_l2_redirect with fake KBUILD_MODNAME 2017-01-20 12:04:07 -05:00
xdp_tx_iptunnel_user.c samples/bpf: Make samples more libbpf-centric 2016-12-15 16:25:47 -03:00

eBPF sample programs
====================

This directory contains a test stubs, verifier test-suite and examples
for using eBPF. The examples use libbpf from tools/lib/bpf.

Build dependencies
==================

Compiling requires having installed:
 * clang >= version 3.4.0
 * llvm >= version 3.7.1

Note that LLVM's tool 'llc' must support target 'bpf', list version
and supported targets with command: ``llc --version``

Kernel headers
--------------

There are usually dependencies to header files of the current kernel.
To avoid installing devel kernel headers system wide, as a normal
user, simply call::

 make headers_install

This will creates a local "usr/include" directory in the git/build top
level directory, that the make system automatically pickup first.

Compiling
=========

For building the BPF samples, issue the below command from the kernel
top level directory::

 make samples/bpf/

Do notice the "/" slash after the directory name.

It is also possible to call make from this directory.  This will just
hide the the invocation of make as above with the appended "/".

Manually compiling LLVM with 'bpf' support
------------------------------------------

Since version 3.7.0, LLVM adds a proper LLVM backend target for the
BPF bytecode architecture.

By default llvm will build all non-experimental backends including bpf.
To generate a smaller llc binary one can use::

 -DLLVM_TARGETS_TO_BUILD="BPF"

Quick sniplet for manually compiling LLVM and clang
(build dependencies are cmake and gcc-c++)::

 $ git clone http://llvm.org/git/llvm.git
 $ cd llvm/tools
 $ git clone --depth 1 http://llvm.org/git/clang.git
 $ cd ..; mkdir build; cd build
 $ cmake .. -DLLVM_TARGETS_TO_BUILD="BPF;X86"
 $ make -j $(getconf _NPROCESSORS_ONLN)

It is also possible to point make to the newly compiled 'llc' or
'clang' command via redefining LLC or CLANG on the make command line::

 make samples/bpf/ LLC=~/git/llvm/build/bin/llc CLANG=~/git/llvm/build/bin/clang