^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /* Copyright (c) 2017 Facebook
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) #include <stdio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) #include <unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) #include <fcntl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <stdlib.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/perf_event.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <sys/resource.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <bpf/libbpf.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <bpf/bpf.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) /* This program verifies bpf attachment to tracepoint sys_enter_* and sys_exit_*.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) * This requires kernel CONFIG_FTRACE_SYSCALLS to be set.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) static void usage(const char *cmd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) printf("USAGE: %s [-i num_progs] [-h]\n", cmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) printf(" -i num_progs # number of progs of the test\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) printf(" -h # help\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) static void verify_map(int map_id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) __u32 key = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) __u32 val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) if (bpf_map_lookup_elem(map_id, &key, &val) != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) fprintf(stderr, "map_lookup failed: %s\n", strerror(errno));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) if (val == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) fprintf(stderr, "failed: map #%d returns value 0\n", map_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) val = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) if (bpf_map_update_elem(map_id, &key, &val, BPF_ANY) != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) fprintf(stderr, "map_update failed: %s\n", strerror(errno));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) static int test(char *filename, int num_progs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) int map0_fds[num_progs], map1_fds[num_progs], fd, i, j = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) struct bpf_link *links[num_progs * 4];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) struct bpf_object *objs[num_progs];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) struct bpf_program *prog;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) for (i = 0; i < num_progs; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) objs[i] = bpf_object__open_file(filename, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) if (libbpf_get_error(objs[i])) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) fprintf(stderr, "opening BPF object file failed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) objs[i] = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) goto cleanup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) /* load BPF program */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) if (bpf_object__load(objs[i])) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) fprintf(stderr, "loading BPF object file failed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) goto cleanup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) map0_fds[i] = bpf_object__find_map_fd_by_name(objs[i],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) "enter_open_map");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) map1_fds[i] = bpf_object__find_map_fd_by_name(objs[i],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) "exit_open_map");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) if (map0_fds[i] < 0 || map1_fds[i] < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) fprintf(stderr, "finding a map in obj file failed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) goto cleanup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) bpf_object__for_each_program(prog, objs[i]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) links[j] = bpf_program__attach(prog);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) if (libbpf_get_error(links[j])) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) fprintf(stderr, "bpf_program__attach failed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) links[j] = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) goto cleanup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) j++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) printf("prog #%d: map ids %d %d\n", i, map0_fds[i], map1_fds[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) /* current load_bpf_file has perf_event_open default pid = -1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) * and cpu = 0, which permits attached bpf execution on
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) * all cpus for all pid's. bpf program execution ignores
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) * cpu affinity.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) /* trigger some "open" operations */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) fd = open(filename, O_RDONLY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) if (fd < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) fprintf(stderr, "open failed: %s\n", strerror(errno));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) close(fd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) /* verify the map */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) for (i = 0; i < num_progs; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) verify_map(map0_fds[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) verify_map(map1_fds[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) cleanup:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) for (j--; j >= 0; j--)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) bpf_link__destroy(links[j]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) for (i--; i >= 0; i--)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) bpf_object__close(objs[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) int main(int argc, char **argv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) int opt, num_progs = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) char filename[256];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) while ((opt = getopt(argc, argv, "i:h")) != -1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) switch (opt) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) case 'i':
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) num_progs = atoi(optarg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) case 'h':
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) usage(argv[0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) setrlimit(RLIMIT_MEMLOCK, &r);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) return test(filename, num_progs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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