// SPDX-License-Identifier: GPL-2.0-only/* Copyright (c) 2017 Facebook */#include <stdio.h>#include <unistd.h>#include <fcntl.h>#include <stdlib.h>#include <string.h>#include <linux/perf_event.h>#include <errno.h>#include <sys/resource.h>#include <bpf/libbpf.h>#include <bpf/bpf.h> /* This program verifies bpf attachment to tracepoint sys_enter_* and sys_exit_*. * This requires kernel CONFIG_FTRACE_SYSCALLS to be set. */ static void usage(const char *cmd){ printf("USAGE: %s [-i num_progs] [-h]\n", cmd); printf(" -i num_progs # number of progs of the test\n"); printf(" -h # help\n");} static void verify_map(int map_id){ __u32 key = 0; __u32 val; if (bpf_map_lookup_elem(map_id, &key, &val) != 0) { fprintf(stderr, "map_lookup failed: %s\n", strerror(errno)); return; } if (val == 0) { fprintf(stderr, "failed: map #%d returns value 0\n", map_id); return; } val = 0; if (bpf_map_update_elem(map_id, &key, &val, BPF_ANY) != 0) { fprintf(stderr, "map_update failed: %s\n", strerror(errno)); return; }} static int test(char *filename, int num_progs){ int map0_fds[num_progs], map1_fds[num_progs], fd, i, j = 0; struct bpf_link *links[num_progs * 4]; struct bpf_object *objs[num_progs]; struct bpf_program *prog; for (i = 0; i < num_progs; i++) { objs[i] = bpf_object__open_file(filename, NULL); if (libbpf_get_error(objs[i])) { fprintf(stderr, "opening BPF object file failed\n"); objs[i] = NULL; goto cleanup; } /* load BPF program */ if (bpf_object__load(objs[i])) { fprintf(stderr, "loading BPF object file failed\n"); goto cleanup; } map0_fds[i] = bpf_object__find_map_fd_by_name(objs[i], "enter_open_map"); map1_fds[i] = bpf_object__find_map_fd_by_name(objs[i], "exit_open_map"); if (map0_fds[i] < 0 || map1_fds[i] < 0) { fprintf(stderr, "finding a map in obj file failed\n"); goto cleanup; } bpf_object__for_each_program(prog, objs[i]) { links[j] = bpf_program__attach(prog); if (libbpf_get_error(links[j])) { fprintf(stderr, "bpf_program__attach failed\n"); links[j] = NULL; goto cleanup; } j++; } printf("prog #%d: map ids %d %d\n", i, map0_fds[i], map1_fds[i]); } /* current load_bpf_file has perf_event_open default pid = -1 * and cpu = 0, which permits attached bpf execution on * all cpus for all pid's. bpf program execution ignores * cpu affinity. */ /* trigger some "open" operations */ fd = open(filename, O_RDONLY); if (fd < 0) { fprintf(stderr, "open failed: %s\n", strerror(errno)); return 1; } close(fd); /* verify the map */ for (i = 0; i < num_progs; i++) { verify_map(map0_fds[i]); verify_map(map1_fds[i]); } cleanup: for (j--; j >= 0; j--) bpf_link__destroy(links[j]); for (i--; i >= 0; i--) bpf_object__close(objs[i]); return 0;} int main(int argc, char **argv){ int opt, num_progs = 1; char filename[256]; while ((opt = getopt(argc, argv, "i:h")) != -1) { switch (opt) { case 'i': num_progs = atoi(optarg); break; case 'h': default: usage(argv[0]); return 0; } } snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]); return test(filename, num_progs);}
// SPDX-License-Identifier: GPL-2.0-only
/* Copyright (c) 2017 Facebook
*/
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <linux/perf_event.h>
#include <errno.h>
#include <sys/resource.h>
#include <bpf/libbpf.h>
#include <bpf/bpf.h>
/* This program verifies bpf attachment to tracepoint sys_enter_* and sys_exit_*.
* This requires kernel CONFIG_FTRACE_SYSCALLS to be set.
*/
static void usage(const char *cmd)
{
printf("USAGE: %s [-i num_progs] [-h]\n", cmd);
printf(" -i num_progs # number of progs of the test\n");
printf(" -h # help\n");
}
static void verify_map(int map_id)
{
__u32 key = 0;
__u32 val;
if (bpf_map_lookup_elem(map_id, &key, &val) != 0) {
fprintf(stderr, "map_lookup failed: %s\n", strerror(errno));
return;
}
if (val == 0) {
fprintf(stderr, "failed: map #%d returns value 0\n", map_id);
return;
}
val = 0;
if (bpf_map_update_elem(map_id, &key, &val, BPF_ANY) != 0) {
fprintf(stderr, "map_update failed: %s\n", strerror(errno));
return;
}
}
static int test(char *filename, int num_progs)
{
int map0_fds[num_progs], map1_fds[num_progs], fd, i, j = 0;
struct bpf_link *links[num_progs * 4];
struct bpf_object *objs[num_progs];
struct bpf_program *prog;
for (i = 0; i < num_progs; i++) {
objs[i] = bpf_object__open_file(filename, NULL);
if (libbpf_get_error(objs[i])) {
fprintf(stderr, "opening BPF object file failed\n");
objs[i] = NULL;
goto cleanup;
}
/* load BPF program */
if (bpf_object__load(objs[i])) {
fprintf(stderr, "loading BPF object file failed\n");
goto cleanup;
}
map0_fds[i] = bpf_object__find_map_fd_by_name(objs[i],
"enter_open_map");
map1_fds[i] = bpf_object__find_map_fd_by_name(objs[i],
"exit_open_map");
if (map0_fds[i] < 0 || map1_fds[i] < 0) {
fprintf(stderr, "finding a map in obj file failed\n");
goto cleanup;
}
bpf_object__for_each_program(prog, objs[i]) {
links[j] = bpf_program__attach(prog);
if (libbpf_get_error(links[j])) {
fprintf(stderr, "bpf_program__attach failed\n");
links[j] = NULL;
goto cleanup;
}
j++;
}
printf("prog #%d: map ids %d %d\n", i, map0_fds[i], map1_fds[i]);
}
/* current load_bpf_file has perf_event_open default pid = -1
* and cpu = 0, which permits attached bpf execution on
* all cpus for all pid's. bpf program execution ignores
* cpu affinity.
*/
/* trigger some "open" operations */
fd = open(filename, O_RDONLY);
if (fd < 0) {
fprintf(stderr, "open failed: %s\n", strerror(errno));
return 1;
}
close(fd);
/* verify the map */
for (i = 0; i < num_progs; i++) {
verify_map(map0_fds[i]);
verify_map(map1_fds[i]);
}
cleanup:
for (j--; j >= 0; j--)
bpf_link__destroy(links[j]);
for (i--; i >= 0; i--)
bpf_object__close(objs[i]);
return 0;
}
int main(int argc, char **argv)
{
int opt, num_progs = 1;
char filename[256];
while ((opt = getopt(argc, argv, "i:h")) != -1) {
switch (opt) {
case 'i':
num_progs = atoi(optarg);
break;
case 'h':
default:
usage(argv[0]);
return 0;
}
}
snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
return test(filename, num_progs);
}