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-rw-r--r--samples/bpf/test_cgrp2_sock.c50
1 files changed, 35 insertions, 15 deletions
diff --git a/samples/bpf/test_cgrp2_sock.c b/samples/bpf/test_cgrp2_sock.c
index 681abbe6c85e..15396761c5cc 100644
--- a/samples/bpf/test_cgrp2_sock.c
+++ b/samples/bpf/test_cgrp2_sock.c
@@ -114,7 +114,12 @@ static int prog_load(__u32 idx, __u32 mark, __u32 prio)
static int usage(const char *argv0)
{
- printf("Usage: %s -b bind-to-dev -m mark -p prio cg-path\n", argv0);
+ printf("Usage:\n");
+ printf(" Attach a program\n");
+ printf(" %s -b bind-to-dev -m mark -p prio cg-path\n", argv0);
+ printf("\n");
+ printf(" Detach a program\n");
+ printf(" %s -d cg-path\n", argv0);
return EXIT_FAILURE;
}
@@ -123,10 +128,14 @@ int main(int argc, char **argv)
__u32 idx = 0, mark = 0, prio = 0;
const char *cgrp_path = NULL;
int cg_fd, prog_fd, ret;
+ int do_attach = 1;
int rc;
- while ((rc = getopt(argc, argv, "b:m:p:")) != -1) {
+ while ((rc = getopt(argc, argv, "db:m:p:")) != -1) {
switch (rc) {
+ case 'd':
+ do_attach = 0;
+ break;
case 'b':
idx = if_nametoindex(optarg);
if (!idx) {
@@ -157,7 +166,7 @@ int main(int argc, char **argv)
return EXIT_FAILURE;
}
- if (!idx && !mark && !prio) {
+ if (do_attach && !idx && !mark && !prio) {
fprintf(stderr,
"One of device, mark or priority must be given\n");
return EXIT_FAILURE;
@@ -169,20 +178,31 @@ int main(int argc, char **argv)
return EXIT_FAILURE;
}
- prog_fd = prog_load(idx, mark, prio);
- if (prog_fd < 0) {
- printf("Failed to load prog: '%s'\n", strerror(errno));
- printf("Output from kernel verifier:\n%s\n-------\n",
- bpf_log_buf);
- return EXIT_FAILURE;
- }
+ if (do_attach) {
+ prog_fd = prog_load(idx, mark, prio);
+ if (prog_fd < 0) {
+ printf("Failed to load prog: '%s'\n", strerror(errno));
+ printf("Output from kernel verifier:\n%s\n-------\n",
+ bpf_log_buf);
+ return EXIT_FAILURE;
+ }
- ret = bpf_prog_attach(prog_fd, cg_fd, BPF_CGROUP_INET_SOCK_CREATE, 0);
- if (ret < 0) {
- printf("Failed to attach prog to cgroup: '%s'\n",
- strerror(errno));
- return EXIT_FAILURE;
+ ret = bpf_prog_attach(prog_fd, cg_fd,
+ BPF_CGROUP_INET_SOCK_CREATE, 0);
+ if (ret < 0) {
+ printf("Failed to attach prog to cgroup: '%s'\n",
+ strerror(errno));
+ return EXIT_FAILURE;
+ }
+ } else {
+ ret = bpf_prog_detach(cg_fd, BPF_CGROUP_INET_SOCK_CREATE);
+ if (ret < 0) {
+ printf("Failed to detach prog from cgroup: '%s'\n",
+ strerror(errno));
+ return EXIT_FAILURE;
+ }
}
+ close(cg_fd);
return EXIT_SUCCESS;
}