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
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.gitignore	tools lib bpf: Change FEATURE-DUMP to FEATURE-DUMP.libbpf	2015-11-05 12:47:51 -03:00
bpf.c	bpf: introduce BPF_F_ALLOW_OVERRIDE flag	2017-02-12 21:52:19 -05:00
bpf.h	bpf: introduce BPF_F_ALLOW_OVERRIDE flag	2017-02-12 21:52:19 -05:00
Build	bpf tools: Add bpf.c/h for common bpf operations	2015-08-07 10:16:58 -03:00
libbpf.c	tools lib bpf: Add flags to bpf_create_map()	2016-12-15 16:25:47 -03:00
libbpf.h	tools lib bpf: Retrive bpf_map through offset of bpf_map_def	2016-11-29 12:10:19 -03:00
Makefile	make use of make variable CURDIR instead of calling pwd	2016-12-11 12:12:56 +01:00