forked from Minki/linux
7f67763337
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>
50 lines
1.7 KiB
C
50 lines
1.7 KiB
C
/*
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* common eBPF ELF operations.
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*
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* Copyright (C) 2013-2015 Alexei Starovoitov <ast@kernel.org>
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* Copyright (C) 2015 Wang Nan <wangnan0@huawei.com>
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* Copyright (C) 2015 Huawei Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation;
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* version 2.1 of the License (not later!)
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this program; if not, see <http://www.gnu.org/licenses>
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*/
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#ifndef __BPF_BPF_H
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#define __BPF_BPF_H
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#include <linux/bpf.h>
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int bpf_create_map(enum bpf_map_type map_type, int key_size, int value_size,
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int max_entries, __u32 map_flags);
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/* Recommend log buffer size */
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#define BPF_LOG_BUF_SIZE 65536
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int bpf_load_program(enum bpf_prog_type type, struct bpf_insn *insns,
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size_t insns_cnt, char *license,
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__u32 kern_version, char *log_buf,
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size_t log_buf_sz);
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int bpf_map_update_elem(int fd, void *key, void *value,
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__u64 flags);
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int bpf_map_lookup_elem(int fd, void *key, void *value);
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int bpf_map_delete_elem(int fd, void *key);
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int bpf_map_get_next_key(int fd, void *key, void *next_key);
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int bpf_obj_pin(int fd, const char *pathname);
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int bpf_obj_get(const char *pathname);
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int bpf_prog_attach(int prog_fd, int attachable_fd, enum bpf_attach_type type,
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unsigned int flags);
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int bpf_prog_detach(int attachable_fd, enum bpf_attach_type type);
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#endif
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