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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /samples/bpf/test_cgrp2_sock2.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'samples/bpf/test_cgrp2_sock2.c')
-rw-r--r--samples/bpf/test_cgrp2_sock2.c95
1 files changed, 95 insertions, 0 deletions
diff --git a/samples/bpf/test_cgrp2_sock2.c b/samples/bpf/test_cgrp2_sock2.c
new file mode 100644
index 000000000..e7060aaa2
--- /dev/null
+++ b/samples/bpf/test_cgrp2_sock2.c
@@ -0,0 +1,95 @@
+// SPDX-License-Identifier: GPL-2.0
+/* eBPF example program:
+ *
+ * - Loads eBPF program
+ *
+ * The eBPF program loads a filter from file and attaches the
+ * program to a cgroup using BPF_PROG_ATTACH
+ */
+
+#define _GNU_SOURCE
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stddef.h>
+#include <string.h>
+#include <unistd.h>
+#include <assert.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <net/if.h>
+#include <linux/bpf.h>
+#include <bpf/bpf.h>
+#include <bpf/libbpf.h>
+
+#include "bpf_insn.h"
+
+static int usage(const char *argv0)
+{
+ printf("Usage: %s cg-path filter-path [filter-id]\n", argv0);
+ return EXIT_FAILURE;
+}
+
+int main(int argc, char **argv)
+{
+ int cg_fd, err, ret = EXIT_FAILURE, filter_id = 0, prog_cnt = 0;
+ const char *link_pin_path = "/sys/fs/bpf/test_cgrp2_sock2";
+ struct bpf_link *link = NULL;
+ struct bpf_program *progs[2];
+ struct bpf_program *prog;
+ struct bpf_object *obj;
+
+ if (argc < 3)
+ return usage(argv[0]);
+
+ if (argc > 3)
+ filter_id = atoi(argv[3]);
+
+ cg_fd = open(argv[1], O_DIRECTORY | O_RDONLY);
+ if (cg_fd < 0) {
+ printf("Failed to open cgroup path: '%s'\n", strerror(errno));
+ return ret;
+ }
+
+ obj = bpf_object__open_file(argv[2], NULL);
+ if (libbpf_get_error(obj)) {
+ printf("ERROR: opening BPF object file failed\n");
+ return ret;
+ }
+
+ bpf_object__for_each_program(prog, obj) {
+ progs[prog_cnt] = prog;
+ prog_cnt++;
+ }
+
+ if (filter_id >= prog_cnt) {
+ printf("Invalid program id; program not found in file\n");
+ goto cleanup;
+ }
+
+ /* load BPF program */
+ if (bpf_object__load(obj)) {
+ printf("ERROR: loading BPF object file failed\n");
+ goto cleanup;
+ }
+
+ link = bpf_program__attach_cgroup(progs[filter_id], cg_fd);
+ if (libbpf_get_error(link)) {
+ printf("ERROR: bpf_program__attach failed\n");
+ link = NULL;
+ goto cleanup;
+ }
+
+ err = bpf_link__pin(link, link_pin_path);
+ if (err < 0) {
+ printf("ERROR: bpf_link__pin failed: %d\n", err);
+ goto cleanup;
+ }
+
+ ret = EXIT_SUCCESS;
+
+cleanup:
+ bpf_link__destroy(link);
+ bpf_object__close(obj);
+ return ret;
+}