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The program load_sock_ops can be used to load sock_ops bpf programs and
to attach it to an existing (v2) cgroup. It can also be used to detach
sock_ops programs.
Examples:
load_sock_ops [-l] <cg-path> <prog filename>
Load and attaches a sock_ops program at the specified cgroup.
If "-l" is used, the program will continue to run to output the
BPF log buffer.
If the specified filename does not end in ".o", it appends
"_kern.o" to the name.
load_sock_ops -r <cg-path>
Detaches the currently attached sock_ops program from the
specified cgroup.
Signed-off-by: Lawrence Brakmo <brakmo@fb.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
97 lines
2.4 KiB
C
97 lines
2.4 KiB
C
/* Copyright (c) 2017 Facebook
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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 version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*/
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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 <linux/bpf.h>
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#include "libbpf.h"
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#include "bpf_load.h"
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#include <unistd.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <linux/unistd.h>
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static void usage(char *pname)
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{
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printf("USAGE:\n %s [-l] <cg-path> <prog filename>\n", pname);
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printf("\tLoad and attach a sock_ops program to the specified "
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"cgroup\n");
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printf("\tIf \"-l\" is used, the program will continue to run\n");
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printf("\tprinting the BPF log buffer\n");
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printf("\tIf the specified filename does not end in \".o\", it\n");
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printf("\tappends \"_kern.o\" to the name\n");
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printf("\n");
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printf(" %s -r <cg-path>\n", pname);
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printf("\tDetaches the currently attached sock_ops program\n");
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printf("\tfrom the specified cgroup\n");
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printf("\n");
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exit(1);
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}
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int main(int argc, char **argv)
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{
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int logFlag = 0;
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int error = 0;
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char *cg_path;
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char fn[500];
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char *prog;
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int cg_fd;
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if (argc < 3)
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usage(argv[0]);
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if (!strcmp(argv[1], "-r")) {
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cg_path = argv[2];
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cg_fd = open(cg_path, O_DIRECTORY, O_RDONLY);
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error = bpf_prog_detach(cg_fd, BPF_CGROUP_SOCK_OPS);
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if (error) {
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printf("ERROR: bpf_prog_detach: %d (%s)\n",
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error, strerror(errno));
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return 2;
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}
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return 0;
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} else if (!strcmp(argv[1], "-h")) {
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usage(argv[0]);
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} else if (!strcmp(argv[1], "-l")) {
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logFlag = 1;
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if (argc < 4)
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usage(argv[0]);
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}
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prog = argv[argc - 1];
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cg_path = argv[argc - 2];
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if (strlen(prog) > 480) {
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fprintf(stderr, "ERROR: program name too long (> 480 chars)\n");
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return 3;
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}
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cg_fd = open(cg_path, O_DIRECTORY, O_RDONLY);
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if (!strcmp(prog + strlen(prog)-2, ".o"))
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strcpy(fn, prog);
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else
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sprintf(fn, "%s_kern.o", prog);
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if (logFlag)
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printf("loading bpf file:%s\n", fn);
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if (load_bpf_file(fn)) {
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printf("ERROR: load_bpf_file failed for: %s\n", fn);
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printf("%s", bpf_log_buf);
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return 4;
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}
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if (logFlag)
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printf("TCP BPF Loaded %s\n", fn);
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error = bpf_prog_attach(prog_fd[0], cg_fd, BPF_CGROUP_SOCK_OPS, 0);
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if (error) {
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printf("ERROR: bpf_prog_attach: %d (%s)\n",
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error, strerror(errno));
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return 5;
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} else if (logFlag) {
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read_trace_pipe();
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}
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return error;
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}
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