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samples/bpf: Add detach option to test_cgrp2_sock 

Add option to detach programs from a cgroup.

Signed-off-by: David Ahern <dsahern@gmail.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Ahern 2017-08-31 15:05:47 -07:00 committed by David S. Miller
parent fa38aa17bc
commit 609b1c3275
1 changed files with 36 additions and 16 deletions
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52
samples/bpf/test_cgrp2_sock.c
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@ -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;
}
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;
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;
}
} 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;
}