bpftool: implement cgroup bpf operations
This patch adds basic cgroup bpf operations to bpftool: cgroup list, attach and detach commands. Usage is described in the corresponding man pages, and examples are provided. Syntax: $ bpftool cgroup list CGROUP $ bpftool cgroup attach CGROUP ATTACH_TYPE PROG [ATTACH_FLAGS] $ bpftool cgroup detach CGROUP ATTACH_TYPE PROG Signed-off-by: Roman Gushchin <guro@fb.com> Cc: Alexei Starovoitov <ast@kernel.org> Cc: Daniel Borkmann <daniel@iogearbox.net> Cc: Jakub Kicinski <jakub.kicinski@netronome.com> Cc: Martin KaFai Lau <kafai@fb.com> Cc: Quentin Monnet <quentin.monnet@netronome.com> Reviewed-by: David Ahern <dsahern@gmail.com> Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Roman Gushchin
committed by
Daniel Borkmann
Daniel Borkmann
parent
49a086c201
commit
5ccda64d38
307
tools/bpf/bpftool/cgroup.c
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307
tools/bpf/bpftool/cgroup.c
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@@ -0,0 +1,307 @@
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// SPDX-License-Identifier: GPL-2.0+
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// Copyright (C) 2017 Facebook
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// Author: Roman Gushchin <guro@fb.com>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <bpf.h>
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#include "main.h"
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#define HELP_SPEC_ATTACH_FLAGS \
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"ATTACH_FLAGS := { multi | override }"
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#define HELP_SPEC_ATTACH_TYPES \
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"ATTACH_TYPE := { ingress | egress | sock_create | sock_ops | device }"
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static const char * const attach_type_strings[] = {
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[BPF_CGROUP_INET_INGRESS] = "ingress",
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[BPF_CGROUP_INET_EGRESS] = "egress",
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[BPF_CGROUP_INET_SOCK_CREATE] = "sock_create",
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[BPF_CGROUP_SOCK_OPS] = "sock_ops",
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[BPF_CGROUP_DEVICE] = "device",
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[__MAX_BPF_ATTACH_TYPE] = NULL,
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};
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static enum bpf_attach_type parse_attach_type(const char *str)
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{
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enum bpf_attach_type type;
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for (type = 0; type < __MAX_BPF_ATTACH_TYPE; type++) {
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if (attach_type_strings[type] &&
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is_prefix(str, attach_type_strings[type]))
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return type;
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}
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return __MAX_BPF_ATTACH_TYPE;
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}
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static int list_bpf_prog(int id, const char *attach_type_str,
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const char *attach_flags_str)
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{
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struct bpf_prog_info info = {};
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__u32 info_len = sizeof(info);
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int prog_fd;
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prog_fd = bpf_prog_get_fd_by_id(id);
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if (prog_fd < 0)
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return -1;
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if (bpf_obj_get_info_by_fd(prog_fd, &info, &info_len)) {
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close(prog_fd);
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return -1;
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}
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if (json_output) {
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jsonw_start_object(json_wtr);
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jsonw_uint_field(json_wtr, "id", info.id);
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jsonw_string_field(json_wtr, "attach_type",
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attach_type_str);
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jsonw_string_field(json_wtr, "attach_flags",
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attach_flags_str);
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jsonw_string_field(json_wtr, "name", info.name);
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jsonw_end_object(json_wtr);
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} else {
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printf("%-8u %-15s %-15s %-15s\n", info.id,
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attach_type_str,
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attach_flags_str,
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info.name);
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}
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close(prog_fd);
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return 0;
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}
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static int list_attached_bpf_progs(int cgroup_fd, enum bpf_attach_type type)
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{
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__u32 prog_ids[1024] = {0};
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char *attach_flags_str;
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__u32 prog_cnt, iter;
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__u32 attach_flags;
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char buf[32];
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int ret;
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prog_cnt = ARRAY_SIZE(prog_ids);
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ret = bpf_prog_query(cgroup_fd, type, 0, &attach_flags, prog_ids,
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&prog_cnt);
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if (ret)
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return ret;
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if (prog_cnt == 0)
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return 0;
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switch (attach_flags) {
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case BPF_F_ALLOW_MULTI:
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attach_flags_str = "multi";
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break;
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case BPF_F_ALLOW_OVERRIDE:
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attach_flags_str = "override";
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break;
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case 0:
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attach_flags_str = "";
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break;
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default:
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snprintf(buf, sizeof(buf), "unknown(%x)", attach_flags);
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attach_flags_str = buf;
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}
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for (iter = 0; iter < prog_cnt; iter++)
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list_bpf_prog(prog_ids[iter], attach_type_strings[type],
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attach_flags_str);
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return 0;
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}
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static int do_list(int argc, char **argv)
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{
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enum bpf_attach_type type;
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int cgroup_fd;
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int ret = -1;
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if (argc < 1) {
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p_err("too few parameters for cgroup list\n");
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goto exit;
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} else if (argc > 1) {
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p_err("too many parameters for cgroup list\n");
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goto exit;
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}
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cgroup_fd = open(argv[0], O_RDONLY);
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if (cgroup_fd < 0) {
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p_err("can't open cgroup %s\n", argv[1]);
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goto exit;
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}
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if (json_output)
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jsonw_start_array(json_wtr);
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else
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printf("%-8s %-15s %-15s %-15s\n", "ID", "AttachType",
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"AttachFlags", "Name");
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for (type = 0; type < __MAX_BPF_ATTACH_TYPE; type++) {
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/*
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* Not all attach types may be supported, so it's expected,
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* that some requests will fail.
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* If we were able to get the list for at least one
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* attach type, let's return 0.
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*/
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if (list_attached_bpf_progs(cgroup_fd, type) == 0)
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ret = 0;
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}
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if (json_output)
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jsonw_end_array(json_wtr);
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close(cgroup_fd);
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exit:
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return ret;
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}
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static int do_attach(int argc, char **argv)
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{
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enum bpf_attach_type attach_type;
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int cgroup_fd, prog_fd;
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int attach_flags = 0;
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int ret = -1;
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int i;
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if (argc < 4) {
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p_err("too few parameters for cgroup attach\n");
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goto exit;
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}
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cgroup_fd = open(argv[0], O_RDONLY);
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if (cgroup_fd < 0) {
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p_err("can't open cgroup %s\n", argv[1]);
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goto exit;
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}
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attach_type = parse_attach_type(argv[1]);
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if (attach_type == __MAX_BPF_ATTACH_TYPE) {
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p_err("invalid attach type\n");
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goto exit_cgroup;
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}
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argc -= 2;
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argv = &argv[2];
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prog_fd = prog_parse_fd(&argc, &argv);
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if (prog_fd < 0)
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goto exit_cgroup;
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for (i = 0; i < argc; i++) {
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if (is_prefix(argv[i], "multi")) {
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attach_flags |= BPF_F_ALLOW_MULTI;
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} else if (is_prefix(argv[i], "override")) {
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attach_flags |= BPF_F_ALLOW_OVERRIDE;
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} else {
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p_err("unknown option: %s\n", argv[i]);
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goto exit_cgroup;
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}
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}
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if (bpf_prog_attach(prog_fd, cgroup_fd, attach_type, attach_flags)) {
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p_err("failed to attach program");
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goto exit_prog;
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}
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if (json_output)
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jsonw_null(json_wtr);
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ret = 0;
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exit_prog:
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close(prog_fd);
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exit_cgroup:
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close(cgroup_fd);
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exit:
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return ret;
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}
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static int do_detach(int argc, char **argv)
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{
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enum bpf_attach_type attach_type;
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int prog_fd, cgroup_fd;
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int ret = -1;
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if (argc < 4) {
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p_err("too few parameters for cgroup detach\n");
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goto exit;
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}
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cgroup_fd = open(argv[0], O_RDONLY);
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if (cgroup_fd < 0) {
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p_err("can't open cgroup %s\n", argv[1]);
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goto exit;
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}
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attach_type = parse_attach_type(argv[1]);
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if (attach_type == __MAX_BPF_ATTACH_TYPE) {
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p_err("invalid attach type");
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goto exit_cgroup;
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}
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argc -= 2;
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argv = &argv[2];
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prog_fd = prog_parse_fd(&argc, &argv);
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if (prog_fd < 0)
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goto exit_cgroup;
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if (bpf_prog_detach2(prog_fd, cgroup_fd, attach_type)) {
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p_err("failed to detach program");
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goto exit_prog;
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}
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if (json_output)
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jsonw_null(json_wtr);
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ret = 0;
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exit_prog:
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close(prog_fd);
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exit_cgroup:
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close(cgroup_fd);
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exit:
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return ret;
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}
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static int do_help(int argc, char **argv)
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{
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if (json_output) {
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jsonw_null(json_wtr);
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return 0;
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}
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fprintf(stderr,
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"Usage: %s %s list CGROUP\n"
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" %s %s attach CGROUP ATTACH_TYPE PROG [ATTACH_FLAGS]\n"
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" %s %s detach CGROUP ATTACH_TYPE PROG\n"
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" %s %s help\n"
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"\n"
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" " HELP_SPEC_ATTACH_TYPES "\n"
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" " HELP_SPEC_ATTACH_FLAGS "\n"
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" " HELP_SPEC_PROGRAM "\n"
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" " HELP_SPEC_OPTIONS "\n"
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"",
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bin_name, argv[-2], bin_name, argv[-2],
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bin_name, argv[-2], bin_name, argv[-2]);
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return 0;
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}
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static const struct cmd cmds[] = {
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{ "list", do_list },
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{ "attach", do_attach },
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{ "detach", do_detach },
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{ "help", do_help },
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{ 0 }
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};
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int do_cgroup(int argc, char **argv)
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{
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return cmd_select(cmds, argc, argv, do_help);
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}
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