ae16189efb
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>
98 lines
2.4 KiB
C
98 lines
2.4 KiB
C
/* Copyright (c) 2017 Facebook
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of version 2 of the GNU General Public
|
|
* License as published by the Free Software Foundation.
|
|
*/
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <linux/bpf.h>
|
|
#include "libbpf.h"
|
|
#include "bpf_load.h"
|
|
#include <unistd.h>
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <linux/unistd.h>
|
|
|
|
static void usage(char *pname)
|
|
{
|
|
printf("USAGE:\n %s [-l] <cg-path> <prog filename>\n", pname);
|
|
printf("\tLoad and attach a sock_ops program to the specified "
|
|
"cgroup\n");
|
|
printf("\tIf \"-l\" is used, the program will continue to run\n");
|
|
printf("\tprinting the BPF log buffer\n");
|
|
printf("\tIf the specified filename does not end in \".o\", it\n");
|
|
printf("\tappends \"_kern.o\" to the name\n");
|
|
printf("\n");
|
|
printf(" %s -r <cg-path>\n", pname);
|
|
printf("\tDetaches the currently attached sock_ops program\n");
|
|
printf("\tfrom the specified cgroup\n");
|
|
printf("\n");
|
|
exit(1);
|
|
}
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
int logFlag = 0;
|
|
int error = 0;
|
|
char *cg_path;
|
|
char fn[500];
|
|
char *prog;
|
|
int cg_fd;
|
|
|
|
if (argc < 3)
|
|
usage(argv[0]);
|
|
|
|
if (!strcmp(argv[1], "-r")) {
|
|
cg_path = argv[2];
|
|
cg_fd = open(cg_path, O_DIRECTORY, O_RDONLY);
|
|
error = bpf_prog_detach(cg_fd, BPF_CGROUP_SOCK_OPS);
|
|
if (error) {
|
|
printf("ERROR: bpf_prog_detach: %d (%s)\n",
|
|
error, strerror(errno));
|
|
return 2;
|
|
}
|
|
return 0;
|
|
} else if (!strcmp(argv[1], "-h")) {
|
|
usage(argv[0]);
|
|
} else if (!strcmp(argv[1], "-l")) {
|
|
logFlag = 1;
|
|
if (argc < 4)
|
|
usage(argv[0]);
|
|
}
|
|
|
|
prog = argv[argc - 1];
|
|
cg_path = argv[argc - 2];
|
|
if (strlen(prog) > 480) {
|
|
fprintf(stderr, "ERROR: program name too long (> 480 chars)\n");
|
|
return 3;
|
|
}
|
|
cg_fd = open(cg_path, O_DIRECTORY, O_RDONLY);
|
|
|
|
if (!strcmp(prog + strlen(prog)-2, ".o"))
|
|
strcpy(fn, prog);
|
|
else
|
|
sprintf(fn, "%s_kern.o", prog);
|
|
if (logFlag)
|
|
printf("loading bpf file:%s\n", fn);
|
|
if (load_bpf_file(fn)) {
|
|
printf("ERROR: load_bpf_file failed for: %s\n", fn);
|
|
printf("%s", bpf_log_buf);
|
|
return 4;
|
|
}
|
|
if (logFlag)
|
|
printf("TCP BPF Loaded %s\n", fn);
|
|
|
|
error = bpf_prog_attach(prog_fd[0], cg_fd, BPF_CGROUP_SOCK_OPS, 0);
|
|
if (error) {
|
|
printf("ERROR: bpf_prog_attach: %d (%s)\n",
|
|
error, strerror(errno));
|
|
return 5;
|
|
} else if (logFlag) {
|
|
read_trace_pipe();
|
|
}
|
|
|
|
return error;
|
|
}
|