526 lines
11 KiB
C
526 lines
11 KiB
C
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// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
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// Copyright (C) 2017 Facebook
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// Author: Roman Gushchin <guro@fb.com>
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#define _XOPEN_SOURCE 500
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#include <errno.h>
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#include <fcntl.h>
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#include <ftw.h>
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#include <mntent.h>
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#include <stdio.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/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 |\n" \
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" sock_ops | device | bind4 | bind6 |\n" \
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" post_bind4 | post_bind6 | connect4 |\n" \
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" connect6 | getpeername4 | getpeername6 |\n" \
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" getsockname4 | getsockname6 | sendmsg4 |\n" \
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" sendmsg6 | recvmsg4 | recvmsg6 |\n" \
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" sysctl | getsockopt | setsockopt |\n" \
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" sock_release }"
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static unsigned int query_flags;
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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_name[type] &&
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is_prefix(str, attach_type_name[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 show_bpf_prog(int id, enum bpf_attach_type attach_type,
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const char *attach_flags_str,
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int level)
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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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if (attach_type < ARRAY_SIZE(attach_type_name))
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jsonw_string_field(json_wtr, "attach_type",
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attach_type_name[attach_type]);
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else
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jsonw_uint_field(json_wtr, "attach_type", attach_type);
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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("%s%-8u ", level ? " " : "", info.id);
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if (attach_type < ARRAY_SIZE(attach_type_name))
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printf("%-15s", attach_type_name[attach_type]);
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else
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printf("type %-10u", attach_type);
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printf(" %-15s %-15s\n", attach_flags_str, 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 count_attached_bpf_progs(int cgroup_fd, enum bpf_attach_type type)
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{
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__u32 prog_cnt = 0;
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int ret;
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ret = bpf_prog_query(cgroup_fd, type, query_flags, NULL,
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NULL, &prog_cnt);
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if (ret)
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return -1;
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return prog_cnt;
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}
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static int cgroup_has_attached_progs(int cgroup_fd)
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{
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enum bpf_attach_type type;
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bool no_prog = true;
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for (type = 0; type < __MAX_BPF_ATTACH_TYPE; type++) {
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int count = count_attached_bpf_progs(cgroup_fd, type);
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if (count < 0 && errno != EINVAL)
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return -1;
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if (count > 0) {
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no_prog = false;
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break;
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}
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}
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return no_prog ? 0 : 1;
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}
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static int show_attached_bpf_progs(int cgroup_fd, enum bpf_attach_type type,
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int level)
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{
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const char *attach_flags_str;
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__u32 prog_ids[1024] = {0};
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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, query_flags, &attach_flags,
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prog_ids, &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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show_bpf_prog(prog_ids[iter], type,
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attach_flags_str, level);
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return 0;
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}
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static int do_show(int argc, char **argv)
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{
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enum bpf_attach_type type;
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int has_attached_progs;
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const char *path;
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int cgroup_fd;
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int ret = -1;
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query_flags = 0;
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if (!REQ_ARGS(1))
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return -1;
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path = GET_ARG();
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while (argc) {
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if (is_prefix(*argv, "effective")) {
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if (query_flags & BPF_F_QUERY_EFFECTIVE) {
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p_err("duplicated argument: %s", *argv);
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return -1;
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}
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query_flags |= BPF_F_QUERY_EFFECTIVE;
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NEXT_ARG();
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} else {
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p_err("expected no more arguments, 'effective', got: '%s'?",
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*argv);
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return -1;
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}
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}
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cgroup_fd = open(path, O_RDONLY);
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if (cgroup_fd < 0) {
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p_err("can't open cgroup %s", path);
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goto exit;
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}
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has_attached_progs = cgroup_has_attached_progs(cgroup_fd);
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if (has_attached_progs < 0) {
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p_err("can't query bpf programs attached to %s: %s",
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path, strerror(errno));
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goto exit_cgroup;
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} else if (!has_attached_progs) {
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ret = 0;
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goto exit_cgroup;
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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 show for at least one
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* attach type, let's return 0.
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*/
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if (show_attached_bpf_progs(cgroup_fd, type, 0) == 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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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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/*
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* To distinguish nftw() errors and do_show_tree_fn() errors
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* and avoid duplicating error messages, let's return -2
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* from do_show_tree_fn() in case of error.
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*/
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#define NFTW_ERR -1
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#define SHOW_TREE_FN_ERR -2
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static int do_show_tree_fn(const char *fpath, const struct stat *sb,
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int typeflag, struct FTW *ftw)
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{
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enum bpf_attach_type type;
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int has_attached_progs;
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int cgroup_fd;
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if (typeflag != FTW_D)
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return 0;
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cgroup_fd = open(fpath, O_RDONLY);
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if (cgroup_fd < 0) {
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p_err("can't open cgroup %s: %s", fpath, strerror(errno));
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return SHOW_TREE_FN_ERR;
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}
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has_attached_progs = cgroup_has_attached_progs(cgroup_fd);
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if (has_attached_progs < 0) {
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p_err("can't query bpf programs attached to %s: %s",
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fpath, strerror(errno));
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close(cgroup_fd);
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return SHOW_TREE_FN_ERR;
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} else if (!has_attached_progs) {
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close(cgroup_fd);
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return 0;
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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_string_field(json_wtr, "cgroup", fpath);
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jsonw_name(json_wtr, "programs");
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jsonw_start_array(json_wtr);
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} else {
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printf("%s\n", fpath);
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}
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for (type = 0; type < __MAX_BPF_ATTACH_TYPE; type++)
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show_attached_bpf_progs(cgroup_fd, type, ftw->level);
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if (errno == EINVAL)
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/* Last attach type does not support query.
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* Do not report an error for this, especially because batch
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* mode would stop processing commands.
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*/
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errno = 0;
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if (json_output) {
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jsonw_end_array(json_wtr);
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jsonw_end_object(json_wtr);
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}
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close(cgroup_fd);
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return 0;
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}
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static char *find_cgroup_root(void)
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{
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struct mntent *mnt;
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FILE *f;
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f = fopen("/proc/mounts", "r");
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if (f == NULL)
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return NULL;
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while ((mnt = getmntent(f))) {
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if (strcmp(mnt->mnt_type, "cgroup2") == 0) {
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fclose(f);
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return strdup(mnt->mnt_dir);
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}
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}
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fclose(f);
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return NULL;
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}
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static int do_show_tree(int argc, char **argv)
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{
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char *cgroup_root, *cgroup_alloced = NULL;
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int ret;
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query_flags = 0;
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if (!argc) {
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cgroup_alloced = find_cgroup_root();
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if (!cgroup_alloced) {
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p_err("cgroup v2 isn't mounted");
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return -1;
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}
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cgroup_root = cgroup_alloced;
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} else {
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cgroup_root = GET_ARG();
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while (argc) {
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if (is_prefix(*argv, "effective")) {
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if (query_flags & BPF_F_QUERY_EFFECTIVE) {
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p_err("duplicated argument: %s", *argv);
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return -1;
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}
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query_flags |= BPF_F_QUERY_EFFECTIVE;
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NEXT_ARG();
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} else {
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p_err("expected no more arguments, 'effective', got: '%s'?",
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*argv);
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return -1;
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}
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}
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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("%s\n"
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"%-8s %-15s %-15s %-15s\n",
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"CgroupPath",
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"ID", "AttachType", "AttachFlags", "Name");
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switch (nftw(cgroup_root, do_show_tree_fn, 1024, FTW_MOUNT)) {
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case NFTW_ERR:
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p_err("can't iterate over %s: %s", cgroup_root,
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strerror(errno));
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ret = -1;
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break;
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case SHOW_TREE_FN_ERR:
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ret = -1;
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break;
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default:
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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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free(cgroup_alloced);
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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) {
|
||
|
|
p_err("too few parameters for cgroup attach");
|
||
|
|
goto exit;
|
||
|
|
}
|
||
|
|
|
||
|
|
cgroup_fd = open(argv[0], O_RDONLY);
|
||
|
|
if (cgroup_fd < 0) {
|
||
|
|
p_err("can't open cgroup %s", argv[0]);
|
||
|
|
goto exit;
|
||
|
|
}
|
||
|
|
|
||
|
|
attach_type = parse_attach_type(argv[1]);
|
||
|
|
if (attach_type == __MAX_BPF_ATTACH_TYPE) {
|
||
|
|
p_err("invalid attach type");
|
||
|
|
goto exit_cgroup;
|
||
|
|
}
|
||
|
|
|
||
|
|
argc -= 2;
|
||
|
|
argv = &argv[2];
|
||
|
|
prog_fd = prog_parse_fd(&argc, &argv);
|
||
|
|
if (prog_fd < 0)
|
||
|
|
goto exit_cgroup;
|
||
|
|
|
||
|
|
for (i = 0; i < argc; i++) {
|
||
|
|
if (is_prefix(argv[i], "multi")) {
|
||
|
|
attach_flags |= BPF_F_ALLOW_MULTI;
|
||
|
|
} else if (is_prefix(argv[i], "override")) {
|
||
|
|
attach_flags |= BPF_F_ALLOW_OVERRIDE;
|
||
|
|
} else {
|
||
|
|
p_err("unknown option: %s", argv[i]);
|
||
|
|
goto exit_cgroup;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (bpf_prog_attach(prog_fd, cgroup_fd, attach_type, attach_flags)) {
|
||
|
|
p_err("failed to attach program");
|
||
|
|
goto exit_prog;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (json_output)
|
||
|
|
jsonw_null(json_wtr);
|
||
|
|
|
||
|
|
ret = 0;
|
||
|
|
|
||
|
|
exit_prog:
|
||
|
|
close(prog_fd);
|
||
|
|
exit_cgroup:
|
||
|
|
close(cgroup_fd);
|
||
|
|
exit:
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int do_detach(int argc, char **argv)
|
||
|
|
{
|
||
|
|
enum bpf_attach_type attach_type;
|
||
|
|
int prog_fd, cgroup_fd;
|
||
|
|
int ret = -1;
|
||
|
|
|
||
|
|
if (argc < 4) {
|
||
|
|
p_err("too few parameters for cgroup detach");
|
||
|
|
goto exit;
|
||
|
|
}
|
||
|
|
|
||
|
|
cgroup_fd = open(argv[0], O_RDONLY);
|
||
|
|
if (cgroup_fd < 0) {
|
||
|
|
p_err("can't open cgroup %s", argv[0]);
|
||
|
|
goto exit;
|
||
|
|
}
|
||
|
|
|
||
|
|
attach_type = parse_attach_type(argv[1]);
|
||
|
|
if (attach_type == __MAX_BPF_ATTACH_TYPE) {
|
||
|
|
p_err("invalid attach type");
|
||
|
|
goto exit_cgroup;
|
||
|
|
}
|
||
|
|
|
||
|
|
argc -= 2;
|
||
|
|
argv = &argv[2];
|
||
|
|
prog_fd = prog_parse_fd(&argc, &argv);
|
||
|
|
if (prog_fd < 0)
|
||
|
|
goto exit_cgroup;
|
||
|
|
|
||
|
|
if (bpf_prog_detach2(prog_fd, cgroup_fd, attach_type)) {
|
||
|
|
p_err("failed to detach program");
|
||
|
|
goto exit_prog;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (json_output)
|
||
|
|
jsonw_null(json_wtr);
|
||
|
|
|
||
|
|
ret = 0;
|
||
|
|
|
||
|
|
exit_prog:
|
||
|
|
close(prog_fd);
|
||
|
|
exit_cgroup:
|
||
|
|
close(cgroup_fd);
|
||
|
|
exit:
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int do_help(int argc, char **argv)
|
||
|
|
{
|
||
|
|
if (json_output) {
|
||
|
|
jsonw_null(json_wtr);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
fprintf(stderr,
|
||
|
|
"Usage: %1$s %2$s { show | list } CGROUP [**effective**]\n"
|
||
|
|
" %1$s %2$s tree [CGROUP_ROOT] [**effective**]\n"
|
||
|
|
" %1$s %2$s attach CGROUP ATTACH_TYPE PROG [ATTACH_FLAGS]\n"
|
||
|
|
" %1$s %2$s detach CGROUP ATTACH_TYPE PROG\n"
|
||
|
|
" %1$s %2$s help\n"
|
||
|
|
"\n"
|
||
|
|
HELP_SPEC_ATTACH_TYPES "\n"
|
||
|
|
" " HELP_SPEC_ATTACH_FLAGS "\n"
|
||
|
|
" " HELP_SPEC_PROGRAM "\n"
|
||
|
|
" " HELP_SPEC_OPTIONS " |\n"
|
||
|
|
" {-f|--bpffs} }\n"
|
||
|
|
"",
|
||
|
|
bin_name, argv[-2]);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct cmd cmds[] = {
|
||
|
|
{ "show", do_show },
|
||
|
|
{ "list", do_show },
|
||
|
|
{ "tree", do_show_tree },
|
||
|
|
{ "attach", do_attach },
|
||
|
|
{ "detach", do_detach },
|
||
|
|
{ "help", do_help },
|
||
|
|
{ 0 }
|
||
|
|
};
|
||
|
|
|
||
|
|
int do_cgroup(int argc, char **argv)
|
||
|
|
{
|
||
|
|
return cmd_select(cmds, argc, argv, do_help);
|
||
|
|
}
|