Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) 2007-2020  B.A.T.M.A.N. contributors:
 *
 * Marek Lindner, Simon Wunderlich
 */
 
#include "main.h"
 
#include <linux/errno.h>
#include <linux/list.h>
#include <linux/moduleparam.h>
#include <linux/netlink.h>
#include <linux/printk.h>
#include <linux/seq_file.h>
#include <linux/skbuff.h>
#include <linux/stddef.h>
#include <linux/string.h>
#include <net/genetlink.h>
#include <net/netlink.h>
#include <uapi/linux/batman_adv.h>
 
#include "bat_algo.h"
#include "netlink.h"
 
char batadv_routing_algo[20] = "BATMAN_IV";
static struct hlist_head batadv_algo_list;
 
/**
 * batadv_algo_init() - Initialize batman-adv algorithm management data
 *  structures
 */
void batadv_algo_init(void)
{
<------>INIT_HLIST_HEAD(&batadv_algo_list);
}
 
static struct batadv_algo_ops *batadv_algo_get(char *name)
{
<------>struct batadv_algo_ops *bat_algo_ops = NULL, *bat_algo_ops_tmp;
 
<------>hlist_for_each_entry(bat_algo_ops_tmp, &batadv_algo_list, list) {
<------><------>if (strcmp(bat_algo_ops_tmp->name, name) != 0)
<------><------><------>continue;
 
<------><------>bat_algo_ops = bat_algo_ops_tmp;
<------><------>break;
<------>}
 
<------>return bat_algo_ops;
}
 
/**
 * batadv_algo_register() - Register callbacks for a mesh algorithm
 * @bat_algo_ops: mesh algorithm callbacks to add
 *
 * Return: 0 on success or negative error number in case of failure
 */
int batadv_algo_register(struct batadv_algo_ops *bat_algo_ops)
{
<------>struct batadv_algo_ops *bat_algo_ops_tmp;
 
<------>bat_algo_ops_tmp = batadv_algo_get(bat_algo_ops->name);
<------>if (bat_algo_ops_tmp) {
<------><------>pr_info("Trying to register already registered routing algorithm: %s\n",
<------><------><------>bat_algo_ops->name);
<------><------>return -EEXIST;
<------>}
 
<------>/* all algorithms must implement all ops (for now) */
<------>if (!bat_algo_ops->iface.enable ||
<------>    !bat_algo_ops->iface.disable ||
<------>    !bat_algo_ops->iface.update_mac ||
<------>    !bat_algo_ops->iface.primary_set ||
<------>    !bat_algo_ops->neigh.cmp ||
<------>    !bat_algo_ops->neigh.is_similar_or_better) {
<------><------>pr_info("Routing algo '%s' does not implement required ops\n",
<------><------><------>bat_algo_ops->name);
<------><------>return -EINVAL;
<------>}
 
<------>INIT_HLIST_NODE(&bat_algo_ops->list);
<------>hlist_add_head(&bat_algo_ops->list, &batadv_algo_list);
 
<------>return 0;
}
 
/**
 * batadv_algo_select() - Select algorithm of soft interface
 * @bat_priv: the bat priv with all the soft interface information
 * @name: name of the algorithm to select
 *
 * The algorithm callbacks for the soft interface will be set when the algorithm
 * with the correct name was found. Any previous selected algorithm will not be
 * deinitialized and the new selected algorithm will also not be initialized.
 * It is therefore not allowed to call batadv_algo_select outside the creation
 * function of the soft interface.
 *
 * Return: 0 on success or negative error number in case of failure
 */
int batadv_algo_select(struct batadv_priv *bat_priv, char *name)
{
<------>struct batadv_algo_ops *bat_algo_ops;
 
<------>bat_algo_ops = batadv_algo_get(name);
<------>if (!bat_algo_ops)
<------><------>return -EINVAL;
 
<------>bat_priv->algo_ops = bat_algo_ops;
 
<------>return 0;
}
 
#ifdef CONFIG_BATMAN_ADV_DEBUGFS
 
/**
 * batadv_algo_seq_print_text() - Print the supported algorithms in a seq file
 * @seq: seq file to print on
 * @offset: not used
 *
 * Return: always 0
 */
int batadv_algo_seq_print_text(struct seq_file *seq, void *offset)
{
<------>struct batadv_algo_ops *bat_algo_ops;
 
<------>seq_puts(seq, "Available routing algorithms:\n");
 
<------>hlist_for_each_entry(bat_algo_ops, &batadv_algo_list, list) {
<------><------>seq_printf(seq, " * %s\n", bat_algo_ops->name);
<------>}
 
<------>return 0;
}
#endif
 
static int batadv_param_set_ra(const char *val, const struct kernel_param *kp)
{
<------>struct batadv_algo_ops *bat_algo_ops;
<------>char *algo_name = (char *)val;
<------>size_t name_len = strlen(algo_name);
 
<------>if (name_len > 0 && algo_name[name_len - 1] == '\n')
<------><------>algo_name[name_len - 1] = '\0';
 
<------>bat_algo_ops = batadv_algo_get(algo_name);
<------>if (!bat_algo_ops) {
<------><------>pr_err("Routing algorithm '%s' is not supported\n", algo_name);
<------><------>return -EINVAL;
<------>}
 
<------>return param_set_copystring(algo_name, kp);
}
 
static const struct kernel_param_ops batadv_param_ops_ra = {
<------>.set = batadv_param_set_ra,
<------>.get = param_get_string,
};
 
static struct kparam_string batadv_param_string_ra = {
<------>.maxlen = sizeof(batadv_routing_algo),
<------>.string = batadv_routing_algo,
};
 
module_param_cb(routing_algo, &batadv_param_ops_ra, &batadv_param_string_ra,
<------><------>0644);
 
/**
 * batadv_algo_dump_entry() - fill in information about one supported routing
 *  algorithm
 * @msg: netlink message to be sent back
 * @portid: Port to reply to
 * @seq: Sequence number of message
 * @bat_algo_ops: Algorithm to be dumped
 *
 * Return: Error number, or 0 on success
 */
static int batadv_algo_dump_entry(struct sk_buff *msg, u32 portid, u32 seq,
<------><------><------><------>  struct batadv_algo_ops *bat_algo_ops)
{
<------>void *hdr;
 
<------>hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family,
<------><------><------>  NLM_F_MULTI, BATADV_CMD_GET_ROUTING_ALGOS);
<------>if (!hdr)
<------><------>return -EMSGSIZE;
 
<------>if (nla_put_string(msg, BATADV_ATTR_ALGO_NAME, bat_algo_ops->name))
<------><------>goto nla_put_failure;
 
<------>genlmsg_end(msg, hdr);
<------>return 0;
 
 nla_put_failure:
<------>genlmsg_cancel(msg, hdr);
<------>return -EMSGSIZE;
}
 
/**
 * batadv_algo_dump() - fill in information about supported routing
 *  algorithms
 * @msg: netlink message to be sent back
 * @cb: Parameters to the netlink request
 *
 * Return: Length of reply message.
 */
int batadv_algo_dump(struct sk_buff *msg, struct netlink_callback *cb)
{
<------>int portid = NETLINK_CB(cb->skb).portid;
<------>struct batadv_algo_ops *bat_algo_ops;
<------>int skip = cb->args[0];
<------>int i = 0;
 
<------>hlist_for_each_entry(bat_algo_ops, &batadv_algo_list, list) {
<------><------>if (i++ < skip)
<------><------><------>continue;
 
<------><------>if (batadv_algo_dump_entry(msg, portid, cb->nlh->nlmsg_seq,
<------><------><------><------><------>   bat_algo_ops)) {
<------><------><------>i--;
<------><------><------>break;
<------><------>}
<------>}
 
<------>cb->args[0] = i;
 
<------>return msg->len;
}