net/batman-adv/bat_v.c

   1 /* Copyright (C) 2013-2016 B.A.T.M.A.N. contributors:
   2  *
   3  * Linus Lüssing, Marek Lindner
   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 "bat_algo.h"
  19 #include "main.h"
  20
  21 #include <linux/atomic.h>
  22 #include <linux/bug.h>
  23 #include <linux/cache.h>
  24 #include <linux/init.h>
  25 #include <linux/jiffies.h>
  26 #include <linux/netdevice.h>
  27 #include <linux/rculist.h>
  28 #include <linux/rcupdate.h>
  29 #include <linux/seq_file.h>
  30 #include <linux/stddef.h>
  31 #include <linux/types.h>
  32 #include <linux/workqueue.h>
  33
  34 #include "bat_v_elp.h"
  35 #include "bat_v_ogm.h"
  36 #include "hard-interface.h"
  37 #include "hash.h"
  38 #include "originator.h"
  39 #include "packet.h"
  40
  41 static void batadv_v_iface_activate(struct batadv_hard_iface *hard_iface)
  42 {
  43         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
  44         struct batadv_hard_iface *primary_if;
  45
  46         primary_if = batadv_primary_if_get_selected(bat_priv);
  47
  48         if (primary_if) {
  49                 batadv_v_elp_iface_activate(primary_if, hard_iface);
  50                 batadv_hardif_put(primary_if);
  51         }
  52
  53         /* B.A.T.M.A.N. V does not use any queuing mechanism, therefore it can
  54          * set the interface as ACTIVE right away, without any risk of race
  55          * condition
  56          */
  57         if (hard_iface->if_status == BATADV_IF_TO_BE_ACTIVATED)
  58                 hard_iface->if_status = BATADV_IF_ACTIVE;
  59 }
  60
  61 static int batadv_v_iface_enable(struct batadv_hard_iface *hard_iface)
  62 {
  63         int ret;
  64
  65         ret = batadv_v_elp_iface_enable(hard_iface);
  66         if (ret < 0)
  67                 return ret;
  68
  69         ret = batadv_v_ogm_iface_enable(hard_iface);
  70         if (ret < 0)
  71                 batadv_v_elp_iface_disable(hard_iface);
  72
  73         /* enable link throughput auto-detection by setting the throughput
  74          * override to zero
  75          */
  76         atomic_set(&hard_iface->bat_v.throughput_override, 0);
  77
  78         return ret;
  79 }
  80
  81 static void batadv_v_iface_disable(struct batadv_hard_iface *hard_iface)
  82 {
  83         batadv_v_elp_iface_disable(hard_iface);
  84 }
  85
  86 static void batadv_v_primary_iface_set(struct batadv_hard_iface *hard_iface)
  87 {
  88         batadv_v_elp_primary_iface_set(hard_iface);
  89         batadv_v_ogm_primary_iface_set(hard_iface);
  90 }
  91
  92 /**
  93  * batadv_v_iface_update_mac - react to hard-interface MAC address change
  94  * @hard_iface: the modified interface
  95  *
  96  * If the modified interface is the primary one, update the originator
  97  * address in the ELP and OGM messages to reflect the new MAC address.
  98  */
  99 static void batadv_v_iface_update_mac(struct batadv_hard_iface *hard_iface)
 100 {
 101         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 102         struct batadv_hard_iface *primary_if;
 103
 104         primary_if = batadv_primary_if_get_selected(bat_priv);
 105         if (primary_if != hard_iface)
 106                 goto out;
 107
 108         batadv_v_primary_iface_set(hard_iface);
 109 out:
 110         if (primary_if)
 111                 batadv_hardif_put(primary_if);
 112 }
 113
 114 static void
 115 batadv_v_hardif_neigh_init(struct batadv_hardif_neigh_node *hardif_neigh)
 116 {
 117         ewma_throughput_init(&hardif_neigh->bat_v.throughput);
 118         INIT_WORK(&hardif_neigh->bat_v.metric_work,
 119                   batadv_v_elp_throughput_metric_update);
 120 }
 121
 122 static void batadv_v_ogm_schedule(struct batadv_hard_iface *hard_iface)
 123 {
 124 }
 125
 126 static void batadv_v_ogm_emit(struct batadv_forw_packet *forw_packet)
 127 {
 128 }
 129
 130 /**
 131  * batadv_v_orig_print_neigh - print neighbors for the originator table
 132  * @orig_node: the orig_node for which the neighbors are printed
 133  * @if_outgoing: outgoing interface for these entries
 134  * @seq: debugfs table seq_file struct
 135  *
 136  * Must be called while holding an rcu lock.
 137  */
 138 static void
 139 batadv_v_orig_print_neigh(struct batadv_orig_node *orig_node,
 140                           struct batadv_hard_iface *if_outgoing,
 141                           struct seq_file *seq)
 142 {
 143         struct batadv_neigh_node *neigh_node;
 144         struct batadv_neigh_ifinfo *n_ifinfo;
 145
 146         hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) {
 147                 n_ifinfo = batadv_neigh_ifinfo_get(neigh_node, if_outgoing);
 148                 if (!n_ifinfo)
 149                         continue;
 150
 151                 seq_printf(seq, " %pM (%9u.%1u)",
 152                            neigh_node->addr,
 153                            n_ifinfo->bat_v.throughput / 10,
 154                            n_ifinfo->bat_v.throughput % 10);
 155
 156                 batadv_neigh_ifinfo_put(n_ifinfo);
 157         }
 158 }
 159
 160 /**
 161  * batadv_v_hardif_neigh_print - print a single ELP neighbour node
 162  * @seq: neighbour table seq_file struct
 163  * @hardif_neigh: hardif neighbour information
 164  */
 165 static void
 166 batadv_v_hardif_neigh_print(struct seq_file *seq,
 167                             struct batadv_hardif_neigh_node *hardif_neigh)
 168 {
 169         int last_secs, last_msecs;
 170         u32 throughput;
 171
 172         last_secs = jiffies_to_msecs(jiffies - hardif_neigh->last_seen) / 1000;
 173         last_msecs = jiffies_to_msecs(jiffies - hardif_neigh->last_seen) % 1000;
 174         throughput = ewma_throughput_read(&hardif_neigh->bat_v.throughput);
 175
 176         seq_printf(seq, "%pM %4i.%03is (%9u.%1u) [%10s]\n",
 177                    hardif_neigh->addr, last_secs, last_msecs, throughput / 10,
 178                    throughput % 10, hardif_neigh->if_incoming->net_dev->name);
 179 }
 180
 181 /**
 182  * batadv_v_neigh_print - print the single hop neighbour list
 183  * @bat_priv: the bat priv with all the soft interface information
 184  * @seq: neighbour table seq_file struct
 185  */
 186 static void batadv_v_neigh_print(struct batadv_priv *bat_priv,
 187                                  struct seq_file *seq)
 188 {
 189         struct net_device *net_dev = (struct net_device *)seq->private;
 190         struct batadv_hardif_neigh_node *hardif_neigh;
 191         struct batadv_hard_iface *hard_iface;
 192         int batman_count = 0;
 193
 194         seq_puts(seq,
 195                  "  Neighbor        last-seen ( throughput) [        IF]\n");
 196
 197         rcu_read_lock();
 198         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
 199                 if (hard_iface->soft_iface != net_dev)
 200                         continue;
 201
 202                 hlist_for_each_entry_rcu(hardif_neigh,
 203                                          &hard_iface->neigh_list, list) {
 204                         batadv_v_hardif_neigh_print(seq, hardif_neigh);
 205                         batman_count++;
 206                 }
 207         }
 208         rcu_read_unlock();
 209
 210         if (batman_count == 0)
 211                 seq_puts(seq, "No batman nodes in range ...\n");
 212 }
 213
 214 /**
 215  * batadv_v_orig_print - print the originator table
 216  * @bat_priv: the bat priv with all the soft interface information
 217  * @seq: debugfs table seq_file struct
 218  * @if_outgoing: the outgoing interface for which this should be printed
 219  */
 220 static void batadv_v_orig_print(struct batadv_priv *bat_priv,
 221                                 struct seq_file *seq,
 222                                 struct batadv_hard_iface *if_outgoing)
 223 {
 224         struct batadv_neigh_node *neigh_node;
 225         struct batadv_hashtable *hash = bat_priv->orig_hash;
 226         int last_seen_msecs, last_seen_secs;
 227         struct batadv_orig_node *orig_node;
 228         struct batadv_neigh_ifinfo *n_ifinfo;
 229         unsigned long last_seen_jiffies;
 230         struct hlist_head *head;
 231         int batman_count = 0;
 232         u32 i;
 233
 234         seq_puts(seq,
 235                  "  Originator      last-seen ( throughput)           Nexthop [outgoingIF]:   Potential nexthops ...\n");
 236
 237         for (i = 0; i < hash->size; i++) {
 238                 head = &hash->table[i];
 239
 240                 rcu_read_lock();
 241                 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
 242                         neigh_node = batadv_orig_router_get(orig_node,
 243                                                             if_outgoing);
 244                         if (!neigh_node)
 245                                 continue;
 246
 247                         n_ifinfo = batadv_neigh_ifinfo_get(neigh_node,
 248                                                            if_outgoing);
 249                         if (!n_ifinfo)
 250                                 goto next;
 251
 252                         last_seen_jiffies = jiffies - orig_node->last_seen;
 253                         last_seen_msecs = jiffies_to_msecs(last_seen_jiffies);
 254                         last_seen_secs = last_seen_msecs / 1000;
 255                         last_seen_msecs = last_seen_msecs % 1000;
 256
 257                         seq_printf(seq, "%pM %4i.%03is (%9u.%1u) %pM [%10s]:",
 258                                    orig_node->orig, last_seen_secs,
 259                                    last_seen_msecs,
 260                                    n_ifinfo->bat_v.throughput / 10,
 261                                    n_ifinfo->bat_v.throughput % 10,
 262                                    neigh_node->addr,
 263                                    neigh_node->if_incoming->net_dev->name);
 264
 265                         batadv_v_orig_print_neigh(orig_node, if_outgoing, seq);
 266                         seq_puts(seq, "\n");
 267                         batman_count++;
 268
 269 next:
 270                         batadv_neigh_node_put(neigh_node);
 271                         if (n_ifinfo)
 272                                 batadv_neigh_ifinfo_put(n_ifinfo);
 273                 }
 274                 rcu_read_unlock();
 275         }
 276
 277         if (batman_count == 0)
 278                 seq_puts(seq, "No batman nodes in range ...\n");
 279 }
 280
 281 static int batadv_v_neigh_cmp(struct batadv_neigh_node *neigh1,
 282                               struct batadv_hard_iface *if_outgoing1,
 283                               struct batadv_neigh_node *neigh2,
 284                               struct batadv_hard_iface *if_outgoing2)
 285 {
 286         struct batadv_neigh_ifinfo *ifinfo1, *ifinfo2;
 287         int ret = 0;
 288
 289         ifinfo1 = batadv_neigh_ifinfo_get(neigh1, if_outgoing1);
 290         if (WARN_ON(!ifinfo1))
 291                 goto err_ifinfo1;
 292
 293         ifinfo2 = batadv_neigh_ifinfo_get(neigh2, if_outgoing2);
 294         if (WARN_ON(!ifinfo2))
 295                 goto err_ifinfo2;
 296
 297         ret = ifinfo1->bat_v.throughput - ifinfo2->bat_v.throughput;
 298
 299         batadv_neigh_ifinfo_put(ifinfo2);
 300 err_ifinfo2:
 301         batadv_neigh_ifinfo_put(ifinfo1);
 302 err_ifinfo1:
 303         return ret;
 304 }
 305
 306 static bool batadv_v_neigh_is_sob(struct batadv_neigh_node *neigh1,
 307                                   struct batadv_hard_iface *if_outgoing1,
 308                                   struct batadv_neigh_node *neigh2,
 309                                   struct batadv_hard_iface *if_outgoing2)
 310 {
 311         struct batadv_neigh_ifinfo *ifinfo1, *ifinfo2;
 312         u32 threshold;
 313         bool ret = false;
 314
 315         ifinfo1 = batadv_neigh_ifinfo_get(neigh1, if_outgoing1);
 316         if (WARN_ON(!ifinfo1))
 317                 goto err_ifinfo1;
 318
 319         ifinfo2 = batadv_neigh_ifinfo_get(neigh2, if_outgoing2);
 320         if (WARN_ON(!ifinfo2))
 321                 goto err_ifinfo2;
 322
 323         threshold = ifinfo1->bat_v.throughput / 4;
 324         threshold = ifinfo1->bat_v.throughput - threshold;
 325
 326         ret = ifinfo2->bat_v.throughput > threshold;
 327
 328         batadv_neigh_ifinfo_put(ifinfo2);
 329 err_ifinfo2:
 330         batadv_neigh_ifinfo_put(ifinfo1);
 331 err_ifinfo1:
 332         return ret;
 333 }
 334
 335 static struct batadv_algo_ops batadv_batman_v __read_mostly = {
 336         .name = "BATMAN_V",
 337         .bat_iface_activate = batadv_v_iface_activate,
 338         .bat_iface_enable = batadv_v_iface_enable,
 339         .bat_iface_disable = batadv_v_iface_disable,
 340         .bat_iface_update_mac = batadv_v_iface_update_mac,
 341         .bat_primary_iface_set = batadv_v_primary_iface_set,
 342         .bat_hardif_neigh_init = batadv_v_hardif_neigh_init,
 343         .bat_ogm_emit = batadv_v_ogm_emit,
 344         .bat_ogm_schedule = batadv_v_ogm_schedule,
 345         .bat_orig_print = batadv_v_orig_print,
 346         .bat_neigh_cmp = batadv_v_neigh_cmp,
 347         .bat_neigh_is_similar_or_better = batadv_v_neigh_is_sob,
 348         .bat_neigh_print = batadv_v_neigh_print,
 349 };
 350
 351 /**
 352  * batadv_v_mesh_init - initialize the B.A.T.M.A.N. V private resources for a
 353  *  mesh
 354  * @bat_priv: the object representing the mesh interface to initialise
 355  *
 356  * Return: 0 on success or a negative error code otherwise
 357  */
 358 int batadv_v_mesh_init(struct batadv_priv *bat_priv)
 359 {
 360         return batadv_v_ogm_init(bat_priv);
 361 }
 362
 363 /**
 364  * batadv_v_mesh_free - free the B.A.T.M.A.N. V private resources for a mesh
 365  * @bat_priv: the object representing the mesh interface to free
 366  */
 367 void batadv_v_mesh_free(struct batadv_priv *bat_priv)
 368 {
 369         batadv_v_ogm_free(bat_priv);
 370 }
 371
 372 /**
 373  * batadv_v_init - B.A.T.M.A.N. V initialization function
 374  *
 375  * Description: Takes care of initializing all the subcomponents.
 376  * It is invoked upon module load only.
 377  *
 378  * Return: 0 on success or a negative error code otherwise
 379  */
 380 int __init batadv_v_init(void)
 381 {
 382         int ret;
 383
 384         /* B.A.T.M.A.N. V echo location protocol packet  */
 385         ret = batadv_recv_handler_register(BATADV_ELP,
 386                                            batadv_v_elp_packet_recv);
 387         if (ret < 0)
 388                 return ret;
 389
 390         ret = batadv_recv_handler_register(BATADV_OGM2,
 391                                            batadv_v_ogm_packet_recv);
 392         if (ret < 0)
 393                 goto elp_unregister;
 394
 395         ret = batadv_algo_register(&batadv_batman_v);
 396         if (ret < 0)
 397                 goto ogm_unregister;
 398
 399         return ret;
 400
 401 ogm_unregister:
 402         batadv_recv_handler_unregister(BATADV_OGM2);
 403
 404 elp_unregister:
 405         batadv_recv_handler_unregister(BATADV_ELP);
 406
 407         return ret;
 408 }