netdev - [PATCH v2 net-next 5/8] samples/bpf: Add detach option to test_cgrp2

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Message-Id: <1503687941-626-6-git-send-email-dsahern@gmail.com>
Date:   Fri, 25 Aug 2017 12:05:38 -0700
From:   David Ahern <dsahern@...il.com>
To:     netdev@...r.kernel.org, daniel@...earbox.net, ast@...nel.org,
        tj@...nel.org, davem@...emloft.net
Cc:     David Ahern <dsahern@...il.com>
Subject: [PATCH v2 net-next 5/8] samples/bpf: Add detach option to test_cgrp2_sock

Add option to detach programs from a cgroup.

Signed-off-by: David Ahern <dsahern@...il.com>
---
 samples/bpf/test_cgrp2_sock.c | 50 ++++++++++++++++++++++++++++++-------------
 1 file changed, 35 insertions(+), 15 deletions(-)

diff --git a/samples/bpf/test_cgrp2_sock.c b/samples/bpf/test_cgrp2_sock.c
index b018bf948933..a1ef7b8bd3f9 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 -r cg-path\n", argv0);
+	printf("Usage:\n");
+	printf("  Attach a program\n");
+	printf("  %s -b bind-to-dev -m mark -p prio -r cg-path\n", argv0);
+	printf("\n");
+	printf("  Detach a program\n");
+	printf("  %s -d cg-path\n", argv0);
 	return EXIT_FAILURE;
 }
 
@@ -124,10 +129,14 @@ 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:r")) != -1) {
+	while ((rc = getopt(argc, argv, "db:m:p:r")) != -1) {
 		switch (rc) {
+		case 'd':
+			do_attach = 0;
+			break;
 		case 'b':
 			idx = if_nametoindex(optarg);
 			if (!idx) {
@@ -161,7 +170,7 @@ 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;
 	}
@@ -172,20 +181,31 @@ 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,
-			      attach_flags);
-	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,
+				      attach_flags);
+		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;
 }
-- 
2.1.4