net/batman-adv/bat_algo.c

   1 /* Copyright (C) 2007-2016  B.A.T.M.A.N. contributors:
   2  *
   3  * Marek Lindner, Simon Wunderlich
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of version 2 of the GNU General Public
   7  * License as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include "main.h"
  19
  20 #include <linux/errno.h>
  21 #include <linux/list.h>
  22 #include <linux/moduleparam.h>
  23 #include <linux/printk.h>
  24 #include <linux/seq_file.h>
  25 #include <linux/stddef.h>
  26 #include <linux/string.h>
  27
  28 #include "bat_algo.h"
  29
  30 char batadv_routing_algo[20] = "BATMAN_IV";
  31 static struct hlist_head batadv_algo_list;
  32
  33 /**
  34  * batadv_algo_init - Initialize batman-adv algorithm management data structures
  35  */
  36 void batadv_algo_init(void)
  37 {
  38         INIT_HLIST_HEAD(&batadv_algo_list);
  39 }
  40
  41 static struct batadv_algo_ops *batadv_algo_get(char *name)
  42 {
  43         struct batadv_algo_ops *bat_algo_ops = NULL, *bat_algo_ops_tmp;
  44
  45         hlist_for_each_entry(bat_algo_ops_tmp, &batadv_algo_list, list) {
  46                 if (strcmp(bat_algo_ops_tmp->name, name) != 0)
  47                         continue;
  48
  49                 bat_algo_ops = bat_algo_ops_tmp;
  50                 break;
  51         }
  52
  53         return bat_algo_ops;
  54 }
  55
  56 int batadv_algo_register(struct batadv_algo_ops *bat_algo_ops)
  57 {
  58         struct batadv_algo_ops *bat_algo_ops_tmp;
  59
  60         bat_algo_ops_tmp = batadv_algo_get(bat_algo_ops->name);
  61         if (bat_algo_ops_tmp) {
  62                 pr_info("Trying to register already registered routing algorithm: %s\n",
  63                         bat_algo_ops->name);
  64                 return -EEXIST;
  65         }
  66
  67         /* all algorithms must implement all ops (for now) */
  68         if (!bat_algo_ops->iface.enable ||
  69             !bat_algo_ops->iface.disable ||
  70             !bat_algo_ops->iface.update_mac ||
  71             !bat_algo_ops->iface.primary_set ||
  72             !bat_algo_ops->neigh.cmp ||
  73             !bat_algo_ops->neigh.is_similar_or_better) {
  74                 pr_info("Routing algo '%s' does not implement required ops\n",
  75                         bat_algo_ops->name);
  76                 return -EINVAL;
  77         }
  78
  79         INIT_HLIST_NODE(&bat_algo_ops->list);
  80         hlist_add_head(&bat_algo_ops->list, &batadv_algo_list);
  81
  82         return 0;
  83 }
  84
  85 int batadv_algo_select(struct batadv_priv *bat_priv, char *name)
  86 {
  87         struct batadv_algo_ops *bat_algo_ops;
  88
  89         bat_algo_ops = batadv_algo_get(name);
  90         if (!bat_algo_ops)
  91                 return -EINVAL;
  92
  93         bat_priv->algo_ops = bat_algo_ops;
  94
  95         return 0;
  96 }
  97
  98 int batadv_algo_seq_print_text(struct seq_file *seq, void *offset)
  99 {
 100         struct batadv_algo_ops *bat_algo_ops;
 101
 102         seq_puts(seq, "Available routing algorithms:\n");
 103
 104         hlist_for_each_entry(bat_algo_ops, &batadv_algo_list, list) {
 105                 seq_printf(seq, " * %s\n", bat_algo_ops->name);
 106         }
 107
 108         return 0;
 109 }
 110
 111 static int batadv_param_set_ra(const char *val, const struct kernel_param *kp)
 112 {
 113         struct batadv_algo_ops *bat_algo_ops;
 114         char *algo_name = (char *)val;
 115         size_t name_len = strlen(algo_name);
 116
 117         if (name_len > 0 && algo_name[name_len - 1] == '\n')
 118                 algo_name[name_len - 1] = '\0';
 119
 120         bat_algo_ops = batadv_algo_get(algo_name);
 121         if (!bat_algo_ops) {
 122                 pr_err("Routing algorithm '%s' is not supported\n", algo_name);
 123                 return -EINVAL;
 124         }
 125
 126         return param_set_copystring(algo_name, kp);
 127 }
 128
 129 static const struct kernel_param_ops batadv_param_ops_ra = {
 130         .set = batadv_param_set_ra,
 131         .get = param_get_string,
 132 };
 133
 134 static struct kparam_string batadv_param_string_ra = {
 135         .maxlen = sizeof(batadv_routing_algo),
 136         .string = batadv_routing_algo,
 137 };
 138
 139 module_param_cb(routing_algo, &batadv_param_ops_ra, &batadv_param_string_ra,
 140                 0644);