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![Sven Eckelmann](/assets/img/avatar_default.png)
The batman-adv source code was using the year of publication (to net-next) as "last" year for the copyright statement. The whole source code mentioned in the MAINTAINERS "BATMAN ADVANCED" section was handled as a single entity regarding the publishing year. This avoided having outdated (in sense of year information - not copyright holder) publishing information inside several files. But since the simple "update copyright year" commit (without other changes) in the file was not well received in the upstream kernel, the option to not have a copyright year (for initial and last publication) in the files are chosen instead. More detailed information about the years can still be retrieved from the SCM system. Signed-off-by: Sven Eckelmann <sven@narfation.org> Acked-by: Marek Lindner <mareklindner@neomailbox.ch> Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
209 lines
5.2 KiB
C
209 lines
5.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (C) 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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#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/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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/**
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* batadv_algo_get() - Search for algorithm with specific name
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* @name: algorithm name to find
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*
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* Return: Pointer to batadv_algo_ops on success, NULL otherwise
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*/
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struct batadv_algo_ops *batadv_algo_get(const 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, const 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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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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