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// SPDX-License-Identifier: GPL-2.0-only
/* Copyright (c) 2018-2021, The Linux Foundation. All rights reserved. */
#include <net/genetlink.h>
#ifdef CONFIG_CNSS_OUT_OF_TREE
#include "cnss_nl.h"
#else
#include <net/cnss_nl.h>
#endif
#include <linux/module.h>
#include <linux/of.h>
#define CLD80211_GENL_NAME "cld80211"
#define CLD80211_MULTICAST_GROUP_SVC_MSGS "svc_msgs"
#define CLD80211_MULTICAST_GROUP_HOST_LOGS "host_logs"
#define CLD80211_MULTICAST_GROUP_FW_LOGS "fw_logs"
#define CLD80211_MULTICAST_GROUP_PER_PKT_STATS "per_pkt_stats"
#define CLD80211_MULTICAST_GROUP_DIAG_EVENTS "diag_events"
#define CLD80211_MULTICAST_GROUP_FATAL_EVENTS "fatal_events"
#define CLD80211_MULTICAST_GROUP_OEM_MSGS "oem_msgs"
static const struct genl_multicast_group nl_mcgrps[] = {
[CLD80211_MCGRP_SVC_MSGS] = { .name =
CLD80211_MULTICAST_GROUP_SVC_MSGS},
[CLD80211_MCGRP_HOST_LOGS] = { .name =
CLD80211_MULTICAST_GROUP_HOST_LOGS},
[CLD80211_MCGRP_FW_LOGS] = { .name =
CLD80211_MULTICAST_GROUP_FW_LOGS},
[CLD80211_MCGRP_PER_PKT_STATS] = { .name =
CLD80211_MULTICAST_GROUP_PER_PKT_STATS},
[CLD80211_MCGRP_DIAG_EVENTS] = { .name =
CLD80211_MULTICAST_GROUP_DIAG_EVENTS},
[CLD80211_MCGRP_FATAL_EVENTS] = { .name =
CLD80211_MULTICAST_GROUP_FATAL_EVENTS},
[CLD80211_MCGRP_OEM_MSGS] = { .name =
CLD80211_MULTICAST_GROUP_OEM_MSGS},
};
struct cld_ops {
cld80211_cb cb;
void *cb_ctx;
};
struct cld80211_nl_data {
struct cld_ops cld_ops[CLD80211_MAX_COMMANDS];
};
static struct cld80211_nl_data nl_data;
static inline struct cld80211_nl_data *get_local_ctx(void)
{
return &nl_data;
}
static struct genl_ops nl_ops[CLD80211_MAX_COMMANDS];
/* policy for the attributes */
static const struct nla_policy cld80211_policy[CLD80211_ATTR_MAX + 1] = {
[CLD80211_ATTR_VENDOR_DATA] = { .type = NLA_NESTED },
[CLD80211_ATTR_DATA] = { .type = NLA_BINARY,
.len = CLD80211_MAX_NL_DATA },
[CLD80211_ATTR_META_DATA] = { .type = NLA_BINARY,
.len = CLD80211_MAX_NL_DATA },
[CLD80211_ATTR_CMD] = { .type = NLA_U32 },
[CLD80211_ATTR_CMD_TAG_DATA] = { .type = NLA_NESTED },
};
static int cld80211_pre_doit(const struct genl_ops *ops, struct sk_buff *skb,
struct genl_info *info)
{
u8 cmd_id = ops->cmd;
struct cld80211_nl_data *nl = get_local_ctx();
if (cmd_id < 1 || cmd_id > CLD80211_MAX_COMMANDS) {
pr_err("CLD80211: Command Not supported: %u\n", cmd_id);
return -EOPNOTSUPP;
}
info->user_ptr[0] = nl->cld_ops[cmd_id - 1].cb;
info->user_ptr[1] = nl->cld_ops[cmd_id - 1].cb_ctx;
return 0;
}
/* The netlink family */
static struct genl_family cld80211_fam __ro_after_init = {
.name = CLD80211_GENL_NAME,
.hdrsize = 0, /* no private header */
.version = 1, /* no particular meaning now */
.maxattr = CLD80211_ATTR_MAX,
.policy = cld80211_policy,
.netnsok = true,
.pre_doit = cld80211_pre_doit,
.post_doit = NULL,
.module = THIS_MODULE,
.ops = nl_ops,
.n_ops = ARRAY_SIZE(nl_ops),
.mcgrps = nl_mcgrps,
.n_mcgrps = ARRAY_SIZE(nl_mcgrps),
};
int register_cld_cmd_cb(u8 cmd_id, cld80211_cb func, void *cb_ctx)
{
struct cld80211_nl_data *nl = get_local_ctx();
pr_debug("CLD80211: Registering command: %d\n", cmd_id);
if (!cmd_id || cmd_id > CLD80211_MAX_COMMANDS) {
pr_debug("CLD80211: invalid command: %d\n", cmd_id);
return -EINVAL;
}
nl->cld_ops[cmd_id - 1].cb = func;
nl->cld_ops[cmd_id - 1].cb_ctx = cb_ctx;
return 0;
}
EXPORT_SYMBOL(register_cld_cmd_cb);
int deregister_cld_cmd_cb(u8 cmd_id)
{
struct cld80211_nl_data *nl = get_local_ctx();
pr_debug("CLD80211: De-registering command: %d\n", cmd_id);
if (!cmd_id || cmd_id > CLD80211_MAX_COMMANDS) {
pr_debug("CLD80211: invalid command: %d\n", cmd_id);
return -EINVAL;
}
nl->cld_ops[cmd_id - 1].cb = NULL;
nl->cld_ops[cmd_id - 1].cb_ctx = NULL;
return 0;
}
EXPORT_SYMBOL(deregister_cld_cmd_cb);
struct genl_family *cld80211_get_genl_family(void)
{
return &cld80211_fam;
}
EXPORT_SYMBOL(cld80211_get_genl_family);
static int cld80211_doit(struct sk_buff *skb, struct genl_info *info)
{
cld80211_cb cld_cb;
void *cld_ctx;
cld_cb = info->user_ptr[0];
if (!cld_cb) {
pr_err("CLD80211: Not supported\n");
return -EOPNOTSUPP;
}
cld_ctx = info->user_ptr[1];
if (info->attrs[CLD80211_ATTR_VENDOR_DATA]) {
cld_cb(nla_data(info->attrs[CLD80211_ATTR_VENDOR_DATA]),
nla_len(info->attrs[CLD80211_ATTR_VENDOR_DATA]),
cld_ctx, info->snd_portid);
} else {
pr_err("CLD80211: No CLD80211_ATTR_VENDOR_DATA\n");
return -EINVAL;
}
return 0;
}
static int __cld80211_init(void)
{
int err, i;
memset(&nl_ops[0], 0, sizeof(nl_ops));
pr_info("CLD80211: Initializing\n");
for (i = 0; i < CLD80211_MAX_COMMANDS; i++) {
nl_ops[i].cmd = i + 1;
nl_ops[i].doit = cld80211_doit;
nl_ops[i].flags = GENL_ADMIN_PERM;
}
err = genl_register_family(&cld80211_fam);
if (err) {
pr_err("CLD80211: Failed to register cld80211 family: %d\n",
err);
}
return err;
}
static void __cld80211_exit(void)
{
genl_unregister_family(&cld80211_fam);
}
/**
* cld80211_is_valid_dt_node_found - Check if valid device tree node present
*
* Valid device tree node means a node with "qcom,wlan" property present and
* "status" property not disabled.
*
* Return: true if valid device tree node found, false if not found
*/
static bool cld80211_is_valid_dt_node_found(void)
{
struct device_node *dn = NULL;
for_each_node_with_property(dn, "qcom,wlan") {
if (of_device_is_available(dn))
break;
}
if (dn)
return true;
return false;
}
static int __init cld80211_init(void)
{
if (!cld80211_is_valid_dt_node_found())
return -ENODEV;
return __cld80211_init();
}
static void __exit cld80211_exit(void)
{
__cld80211_exit();
}
module_init(cld80211_init);
module_exit(cld80211_exit);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("CNSS generic netlink module");
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