mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-11-01 00:48:50 +00:00
d7a18ea7e8
Generalize BPF program attaching and allow libbpf to auto-detect type (and extra parameters, where applicable) and attach supported BPF program types based on program sections. Currently this is supported for: - kprobe/kretprobe; - tracepoint; - raw tracepoint; - tracing programs (typed raw TP/fentry/fexit). More types support can be trivially added within this framework. Signed-off-by: Andrii Nakryiko <andriin@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Martin KaFai Lau <kafai@fb.com> Link: https://lore.kernel.org/bpf/20191214014341.3442258-3-andriin@fb.com
76 lines
2.2 KiB
C
76 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
#include <test_progs.h>
|
|
|
|
void test_probe_user(void)
|
|
{
|
|
const char *prog_name = "kprobe/__sys_connect";
|
|
const char *obj_file = "./test_probe_user.o";
|
|
DECLARE_LIBBPF_OPTS(bpf_object_open_opts, opts, );
|
|
int err, results_map_fd, sock_fd, duration = 0;
|
|
struct sockaddr curr, orig, tmp;
|
|
struct sockaddr_in *in = (struct sockaddr_in *)&curr;
|
|
struct bpf_link *kprobe_link = NULL;
|
|
struct bpf_program *kprobe_prog;
|
|
struct bpf_object *obj;
|
|
static const int zero = 0;
|
|
|
|
obj = bpf_object__open_file(obj_file, &opts);
|
|
if (CHECK(IS_ERR(obj), "obj_open_file", "err %ld\n", PTR_ERR(obj)))
|
|
return;
|
|
|
|
kprobe_prog = bpf_object__find_program_by_title(obj, prog_name);
|
|
if (CHECK(!kprobe_prog, "find_probe",
|
|
"prog '%s' not found\n", prog_name))
|
|
goto cleanup;
|
|
|
|
err = bpf_object__load(obj);
|
|
if (CHECK(err, "obj_load", "err %d\n", err))
|
|
goto cleanup;
|
|
|
|
results_map_fd = bpf_find_map(__func__, obj, "test_pro.bss");
|
|
if (CHECK(results_map_fd < 0, "find_bss_map",
|
|
"err %d\n", results_map_fd))
|
|
goto cleanup;
|
|
|
|
kprobe_link = bpf_program__attach(kprobe_prog);
|
|
if (CHECK(IS_ERR(kprobe_link), "attach_kprobe",
|
|
"err %ld\n", PTR_ERR(kprobe_link))) {
|
|
kprobe_link = NULL;
|
|
goto cleanup;
|
|
}
|
|
|
|
memset(&curr, 0, sizeof(curr));
|
|
in->sin_family = AF_INET;
|
|
in->sin_port = htons(5555);
|
|
in->sin_addr.s_addr = inet_addr("255.255.255.255");
|
|
memcpy(&orig, &curr, sizeof(curr));
|
|
|
|
sock_fd = socket(AF_INET, SOCK_STREAM, 0);
|
|
if (CHECK(sock_fd < 0, "create_sock_fd", "err %d\n", sock_fd))
|
|
goto cleanup;
|
|
|
|
connect(sock_fd, &curr, sizeof(curr));
|
|
close(sock_fd);
|
|
|
|
err = bpf_map_lookup_elem(results_map_fd, &zero, &tmp);
|
|
if (CHECK(err, "get_kprobe_res",
|
|
"failed to get kprobe res: %d\n", err))
|
|
goto cleanup;
|
|
|
|
in = (struct sockaddr_in *)&tmp;
|
|
if (CHECK(memcmp(&tmp, &orig, sizeof(orig)), "check_kprobe_res",
|
|
"wrong kprobe res from probe read: %s:%u\n",
|
|
inet_ntoa(in->sin_addr), ntohs(in->sin_port)))
|
|
goto cleanup;
|
|
|
|
memset(&tmp, 0xab, sizeof(tmp));
|
|
|
|
in = (struct sockaddr_in *)&curr;
|
|
if (CHECK(memcmp(&curr, &tmp, sizeof(tmp)), "check_kprobe_res",
|
|
"wrong kprobe res from probe write: %s:%u\n",
|
|
inet_ntoa(in->sin_addr), ntohs(in->sin_port)))
|
|
goto cleanup;
|
|
cleanup:
|
|
bpf_link__destroy(kprobe_link);
|
|
bpf_object__close(obj);
|
|
}
|