240 строки
6.1 KiB
C
240 строки
6.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (C) 2007-2018 B.A.T.M.A.N. contributors:
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*
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* Marek Lindner, Simon Wunderlich
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "main.h"
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#include <linux/errno.h>
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#include <linux/list.h>
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#include <linux/moduleparam.h>
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#include <linux/netlink.h>
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#include <linux/printk.h>
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#include <linux/seq_file.h>
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#include <linux/skbuff.h>
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#include <linux/stddef.h>
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#include <linux/string.h>
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#include <net/genetlink.h>
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#include <net/netlink.h>
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#include <uapi/linux/batman_adv.h>
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#include "bat_algo.h"
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#include "netlink.h"
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char batadv_routing_algo[20] = "BATMAN_IV";
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static struct hlist_head batadv_algo_list;
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/**
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* batadv_algo_init() - Initialize batman-adv algorithm management data
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* structures
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*/
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void batadv_algo_init(void)
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{
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INIT_HLIST_HEAD(&batadv_algo_list);
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}
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static struct batadv_algo_ops *batadv_algo_get(char *name)
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{
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struct batadv_algo_ops *bat_algo_ops = NULL, *bat_algo_ops_tmp;
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hlist_for_each_entry(bat_algo_ops_tmp, &batadv_algo_list, list) {
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if (strcmp(bat_algo_ops_tmp->name, name) != 0)
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continue;
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bat_algo_ops = bat_algo_ops_tmp;
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break;
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}
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return bat_algo_ops;
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}
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/**
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* batadv_algo_register() - Register callbacks for a mesh algorithm
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* @bat_algo_ops: mesh algorithm callbacks to add
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*
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* Return: 0 on success or negative error number in case of failure
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*/
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int batadv_algo_register(struct batadv_algo_ops *bat_algo_ops)
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{
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struct batadv_algo_ops *bat_algo_ops_tmp;
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bat_algo_ops_tmp = batadv_algo_get(bat_algo_ops->name);
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if (bat_algo_ops_tmp) {
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pr_info("Trying to register already registered routing algorithm: %s\n",
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bat_algo_ops->name);
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return -EEXIST;
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}
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/* all algorithms must implement all ops (for now) */
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if (!bat_algo_ops->iface.enable ||
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!bat_algo_ops->iface.disable ||
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!bat_algo_ops->iface.update_mac ||
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!bat_algo_ops->iface.primary_set ||
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!bat_algo_ops->neigh.cmp ||
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!bat_algo_ops->neigh.is_similar_or_better) {
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pr_info("Routing algo '%s' does not implement required ops\n",
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bat_algo_ops->name);
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return -EINVAL;
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}
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INIT_HLIST_NODE(&bat_algo_ops->list);
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hlist_add_head(&bat_algo_ops->list, &batadv_algo_list);
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return 0;
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}
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/**
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* batadv_algo_select() - Select algorithm of soft interface
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* @bat_priv: the bat priv with all the soft interface information
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* @name: name of the algorithm to select
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*
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* The algorithm callbacks for the soft interface will be set when the algorithm
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* with the correct name was found. Any previous selected algorithm will not be
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* deinitialized and the new selected algorithm will also not be initialized.
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* It is therefore not allowed to call batadv_algo_select outside the creation
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* function of the soft interface.
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*
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* Return: 0 on success or negative error number in case of failure
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*/
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int batadv_algo_select(struct batadv_priv *bat_priv, char *name)
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{
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struct batadv_algo_ops *bat_algo_ops;
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bat_algo_ops = batadv_algo_get(name);
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if (!bat_algo_ops)
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return -EINVAL;
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bat_priv->algo_ops = bat_algo_ops;
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return 0;
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}
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#ifdef CONFIG_BATMAN_ADV_DEBUGFS
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/**
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* batadv_algo_seq_print_text() - Print the supported algorithms in a seq file
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* @seq: seq file to print on
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* @offset: not used
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*
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* Return: always 0
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*/
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int batadv_algo_seq_print_text(struct seq_file *seq, void *offset)
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{
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struct batadv_algo_ops *bat_algo_ops;
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seq_puts(seq, "Available routing algorithms:\n");
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hlist_for_each_entry(bat_algo_ops, &batadv_algo_list, list) {
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seq_printf(seq, " * %s\n", bat_algo_ops->name);
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}
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return 0;
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}
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#endif
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static int batadv_param_set_ra(const char *val, const struct kernel_param *kp)
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{
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struct batadv_algo_ops *bat_algo_ops;
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char *algo_name = (char *)val;
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size_t name_len = strlen(algo_name);
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if (name_len > 0 && algo_name[name_len - 1] == '\n')
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algo_name[name_len - 1] = '\0';
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bat_algo_ops = batadv_algo_get(algo_name);
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if (!bat_algo_ops) {
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pr_err("Routing algorithm '%s' is not supported\n", algo_name);
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return -EINVAL;
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}
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return param_set_copystring(algo_name, kp);
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}
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static const struct kernel_param_ops batadv_param_ops_ra = {
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.set = batadv_param_set_ra,
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.get = param_get_string,
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};
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static struct kparam_string batadv_param_string_ra = {
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.maxlen = sizeof(batadv_routing_algo),
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.string = batadv_routing_algo,
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};
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module_param_cb(routing_algo, &batadv_param_ops_ra, &batadv_param_string_ra,
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0644);
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/**
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* batadv_algo_dump_entry() - fill in information about one supported routing
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* algorithm
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* @msg: netlink message to be sent back
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* @portid: Port to reply to
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* @seq: Sequence number of message
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* @bat_algo_ops: Algorithm to be dumped
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*
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* Return: Error number, or 0 on success
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*/
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static int batadv_algo_dump_entry(struct sk_buff *msg, u32 portid, u32 seq,
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struct batadv_algo_ops *bat_algo_ops)
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{
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void *hdr;
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hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family,
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NLM_F_MULTI, BATADV_CMD_GET_ROUTING_ALGOS);
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if (!hdr)
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return -EMSGSIZE;
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if (nla_put_string(msg, BATADV_ATTR_ALGO_NAME, bat_algo_ops->name))
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goto nla_put_failure;
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genlmsg_end(msg, hdr);
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return 0;
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nla_put_failure:
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genlmsg_cancel(msg, hdr);
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return -EMSGSIZE;
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}
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/**
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* batadv_algo_dump() - fill in information about supported routing
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* algorithms
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* @msg: netlink message to be sent back
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* @cb: Parameters to the netlink request
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*
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* Return: Length of reply message.
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*/
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int batadv_algo_dump(struct sk_buff *msg, struct netlink_callback *cb)
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{
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int portid = NETLINK_CB(cb->skb).portid;
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struct batadv_algo_ops *bat_algo_ops;
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int skip = cb->args[0];
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int i = 0;
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hlist_for_each_entry(bat_algo_ops, &batadv_algo_list, list) {
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if (i++ < skip)
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continue;
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if (batadv_algo_dump_entry(msg, portid, cb->nlh->nlmsg_seq,
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bat_algo_ops)) {
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i--;
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break;
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}
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}
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cb->args[0] = i;
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return msg->len;
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}
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