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Message-Id: <20250912195339.20635-8-yana2bsh@gmail.com>
Date: Fri, 12 Sep 2025 22:53:30 +0300
From: Yana Bashlykova <yana2bsh@...il.com>
To: "David S. Miller" <davem@...emloft.net>
Cc: Yana Bashlykova <yana2bsh@...il.com>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
linux-kernel@...r.kernel.org,
netdev@...r.kernel.org,
lvc-project@...uxtesting.org
Subject: [PATCH 6.1 07/15] genetlink: add THIRD_GENL family
- New family with echo command
- Supports string and flag attributes
- Sysfs interface at /sys/kernel/third_genl/message
Signed-off-by: Yana Bashlykova <yana2bsh@...il.com>
---
.../net-pf-16-proto-16-family-PARALLEL_GENL.c | 103 ++++++++++++++++++
1 file changed, 103 insertions(+)
diff --git a/drivers/net/genetlink/net-pf-16-proto-16-family-PARALLEL_GENL.c b/drivers/net/genetlink/net-pf-16-proto-16-family-PARALLEL_GENL.c
index cdedd77b2a1b..f651159a311c 100644
--- a/drivers/net/genetlink/net-pf-16-proto-16-family-PARALLEL_GENL.c
+++ b/drivers/net/genetlink/net-pf-16-proto-16-family-PARALLEL_GENL.c
@@ -152,10 +152,13 @@ static DEFINE_MUTEX(genl_mutex);
#define PARALLEL_GENL_FAMILY_NAME "PARALLEL_GENL"
+#define THIRD_GENL_FAMILY_NAME "THIRD_GENL"
+
#define PATH_GENL_TEST_NUM "/sys/kernel/genl_test/value"
#define PATH_GENL_TEST_MES "/sys/kernel/genl_test/message"
#define PATH_GENL_TEST_DEV "/sys/kernel/genl_test/some_info"
#define PATH_PARALLEL_GENL_MES "/sys/kernel/parallel_genl/message"
+#define PATH_THIRD_GENL_MES "/sys/kernel/third_genl/message"
// TEST_GENL
enum {
@@ -205,6 +208,8 @@ static struct genl_family my_genl_family;
static struct genl_family my_genl_family_parallel;
+static struct genl_family third_genl_family;
+
enum my_multicast_groups {
MY_MCGRP_GENL,
};
@@ -1077,6 +1082,94 @@ static struct genl_family my_genl_family_parallel = {
.n_mcgrps = ARRAY_SIZE(genl_many_mcgrps_two),
};
+// THIRD_GENL
+enum {
+ THIRD_GENL_ATTR_UNSPEC,
+ THIRD_GENL_ATTR_DATA,
+ THIRD_GENL_ATTR_FLAG,
+ __THIRD_GENL_ATTR_MAX,
+};
+
+#define THIRD_GENL_ATTR_MAX (__THIRD_GENL_ATTR_MAX - 1)
+
+enum {
+ THIRD_GENL_CMD_UNSPEC,
+ THIRD_GENL_CMD_ECHO,
+ __THIRD_GENL_CMD_MAX,
+};
+
+#define THIRD_GENL_CMD_MAX (__THIRD_GENL_CMD_MAX - 1)
+
+static const struct nla_policy third_genl_policy[THIRD_GENL_ATTR_MAX + 1] = {
+ [THIRD_GENL_ATTR_UNSPEC] = { .type = NLA_UNSPEC },
+ [THIRD_GENL_ATTR_DATA] = { .type = NLA_STRING },
+ [THIRD_GENL_ATTR_FLAG] = { .type = NLA_FLAG },
+};
+
+// Functions for THIRD_GENL family
+static int third_genl_echo(struct sk_buff *skb, struct genl_info *info)
+{
+ struct sk_buff *msg;
+ void *data;
+ int ret;
+ char *str;
+
+ if (info->nlhdr->nlmsg_flags & NLM_F_ECHO) {
+ msg = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
+ if (!msg)
+ return -ENOMEM;
+
+ data = genlmsg_put_reply(msg, info, &my_genl_family, 0,
+ THIRD_GENL_CMD_ECHO);
+ if (!data)
+ goto error;
+
+ str = "Hello from THIRD_GENL!";
+ strcpy(sysfs_data.third_genl_message, str);
+
+ ret = nla_put_string(msg, THIRD_GENL_ATTR_DATA, str);
+ if (ret < 0)
+ goto error;
+
+ ret = nla_put_flag(msg, THIRD_GENL_ATTR_FLAG);
+ if (ret < 0)
+ goto error;
+
+ genlmsg_end(msg, data);
+
+ genlmsg_reply(msg, info);
+ }
+
+ return 0;
+
+error:
+ nlmsg_free(msg);
+ return -EMSGSIZE;
+}
+
+// Generic Netlink operations for THIRD_GENL family
+static const struct genl_ops third_genl_ops[] = {
+ {
+ .cmd = THIRD_GENL_CMD_ECHO,
+ .flags = 0,
+ .policy = third_genl_policy,
+ .doit = third_genl_echo,
+ .dumpit = NULL,
+ },
+};
+
+// genl_family struct for THIRD_GENL family
+static struct genl_family third_genl_family = {
+ .hdrsize = 0,
+ .name = THIRD_GENL_FAMILY_NAME,
+ .version = 1,
+ .maxattr = THIRD_GENL_ATTR_MAX,
+ .netnsok = true,
+ .ops = third_genl_ops,
+ .n_ops = ARRAY_SIZE(third_genl_ops),
+ .policy = third_genl_policy,
+};
+
// genl_family struct with incorrect name
static struct genl_family incorrect_genl_family = {
.hdrsize = 0,
@@ -1144,8 +1237,16 @@ static int __init init_netlink(void)
goto failure_2;
}
+ rc = genl_register_family(&third_genl_family);
+ if (rc) {
+ pr_err("%s: Failed to register Generic Netlink family\n", __func__);
+ goto failure_3;
+ }
+
return 0;
+failure_3:
+ genl_unregister_family(&my_genl_family_parallel);
failure_2:
genl_unregister_family(&my_genl_family);
failure_1:
@@ -1311,6 +1412,7 @@ static int __init module_netlink_init(void)
err_family:
genl_unregister_family(&my_genl_family);
genl_unregister_family(&my_genl_family_parallel);
+ genl_unregister_family(&third_genl_family);
err_sysfs:
sysfs_remove_file(kobj_genl_test, &my_attr_u32_genl_test.attr);
sysfs_remove_file(kobj_genl_test, &my_attr_str_genl_test.attr);
@@ -1330,6 +1432,7 @@ static void __exit module_netlink_exit(void)
netlink_unregister_notifier(&genl_notifier);
genl_unregister_family(&my_genl_family);
genl_unregister_family(&my_genl_family_parallel);
+ genl_unregister_family(&third_genl_family);
sysfs_remove_file(kobj_genl_test, &my_attr_u32_genl_test.attr);
sysfs_remove_file(kobj_genl_test, &my_attr_str_genl_test.attr);
--
2.34.1
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