net/batman-adv/soft-interface.c

   1 /*
   2  * Copyright (C) 2007-2012 B.A.T.M.A.N. contributors:
   3  *
   4  * Marek Lindner, Simon Wunderlich
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of version 2 of the GNU General Public
   8  * License as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  18  * 02110-1301, USA
  19  *
  20  */
  21
  22 #include "main.h"
  23 #include "soft-interface.h"
  24 #include "hard-interface.h"
  25 #include "routing.h"
  26 #include "send.h"
  27 #include "bat_debugfs.h"
  28 #include "translation-table.h"
  29 #include "hash.h"
  30 #include "gateway_common.h"
  31 #include "gateway_client.h"
  32 #include "bat_sysfs.h"
  33 #include "originator.h"
  34 #include <linux/slab.h>
  35 #include <linux/ethtool.h>
  36 #include <linux/etherdevice.h>
  37 #include <linux/if_vlan.h>
  38 #include "unicast.h"
  39 #include "bridge_loop_avoidance.h"
  40
  41
  42 static int bat_get_settings(struct net_device *dev, struct ethtool_cmd *cmd);
  43 static void bat_get_drvinfo(struct net_device *dev,
  44                             struct ethtool_drvinfo *info);
  45 static u32 bat_get_msglevel(struct net_device *dev);
  46 static void bat_set_msglevel(struct net_device *dev, u32 value);
  47 static u32 bat_get_link(struct net_device *dev);
  48 static void batadv_get_strings(struct net_device *dev, u32 stringset, u8 *data);
  49 static void batadv_get_ethtool_stats(struct net_device *dev,
  50                                      struct ethtool_stats *stats, u64 *data);
  51 static int batadv_get_sset_count(struct net_device *dev, int stringset);
  52
  53 static const struct ethtool_ops bat_ethtool_ops = {
  54         .get_settings = bat_get_settings,
  55         .get_drvinfo = bat_get_drvinfo,
  56         .get_msglevel = bat_get_msglevel,
  57         .set_msglevel = bat_set_msglevel,
  58         .get_link = bat_get_link,
  59         .get_strings = batadv_get_strings,
  60         .get_ethtool_stats = batadv_get_ethtool_stats,
  61         .get_sset_count = batadv_get_sset_count,
  62 };
  63
  64 int my_skb_head_push(struct sk_buff *skb, unsigned int len)
  65 {
  66         int result;
  67
  68         /**
  69          * TODO: We must check if we can release all references to non-payload
  70          * data using skb_header_release in our skbs to allow skb_cow_header to
  71          * work optimally. This means that those skbs are not allowed to read
  72          * or write any data which is before the current position of skb->data
  73          * after that call and thus allow other skbs with the same data buffer
  74          * to write freely in that area.
  75          */
  76         result = skb_cow_head(skb, len);
  77         if (result < 0)
  78                 return result;
  79
  80         skb_push(skb, len);
  81         return 0;
  82 }
  83
  84 static int interface_open(struct net_device *dev)
  85 {
  86         netif_start_queue(dev);
  87         return 0;
  88 }
  89
  90 static int interface_release(struct net_device *dev)
  91 {
  92         netif_stop_queue(dev);
  93         return 0;
  94 }
  95
  96 static struct net_device_stats *interface_stats(struct net_device *dev)
  97 {
  98         struct bat_priv *bat_priv = netdev_priv(dev);
  99         return &bat_priv->stats;
 100 }
 101
 102 static int interface_set_mac_addr(struct net_device *dev, void *p)
 103 {
 104         struct bat_priv *bat_priv = netdev_priv(dev);
 105         struct sockaddr *addr = p;
 106
 107         if (!is_valid_ether_addr(addr->sa_data))
 108                 return -EADDRNOTAVAIL;
 109
 110         /* only modify transtable if it has been initialized before */
 111         if (atomic_read(&bat_priv->mesh_state) == MESH_ACTIVE) {
 112                 tt_local_remove(bat_priv, dev->dev_addr,
 113                                 "mac address changed", false);
 114                 tt_local_add(dev, addr->sa_data, NULL_IFINDEX);
 115         }
 116
 117         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
 118         dev->addr_assign_type &= ~NET_ADDR_RANDOM;
 119         return 0;
 120 }
 121
 122 static int interface_change_mtu(struct net_device *dev, int new_mtu)
 123 {
 124         /* check ranges */
 125         if ((new_mtu < 68) || (new_mtu > hardif_min_mtu(dev)))
 126                 return -EINVAL;
 127
 128         dev->mtu = new_mtu;
 129
 130         return 0;
 131 }
 132
 133 static int interface_tx(struct sk_buff *skb, struct net_device *soft_iface)
 134 {
 135         struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
 136         struct bat_priv *bat_priv = netdev_priv(soft_iface);
 137         struct hard_iface *primary_if = NULL;
 138         struct bcast_packet *bcast_packet;
 139         struct vlan_ethhdr *vhdr;
 140         static const uint8_t stp_addr[ETH_ALEN] = {0x01, 0x80, 0xC2, 0x00, 0x00,
 141                                                    0x00};
 142         unsigned int header_len = 0;
 143         int data_len = skb->len, ret;
 144         short vid __maybe_unused = -1;
 145         bool do_bcast = false;
 146
 147         if (atomic_read(&bat_priv->mesh_state) != MESH_ACTIVE)
 148                 goto dropped;
 149
 150         soft_iface->trans_start = jiffies;
 151
 152         switch (ntohs(ethhdr->h_proto)) {
 153         case ETH_P_8021Q:
 154                 vhdr = (struct vlan_ethhdr *)skb->data;
 155                 vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;
 156
 157                 if (ntohs(vhdr->h_vlan_encapsulated_proto) != ETH_P_BATMAN)
 158                         break;
 159
 160                 /* fall through */
 161         case ETH_P_BATMAN:
 162                 goto dropped;
 163         }
 164
 165         if (batadv_bla_tx(bat_priv, skb, vid))
 166                 goto dropped;
 167
 168         /* Register the client MAC in the transtable */
 169         tt_local_add(soft_iface, ethhdr->h_source, skb->skb_iif);
 170
 171         /* don't accept stp packets. STP does not help in meshes.
 172          * better use the bridge loop avoidance ...
 173          */
 174         if (compare_eth(ethhdr->h_dest, stp_addr))
 175                 goto dropped;
 176
 177         if (is_multicast_ether_addr(ethhdr->h_dest)) {
 178                 do_bcast = true;
 179
 180                 switch (atomic_read(&bat_priv->gw_mode)) {
 181                 case GW_MODE_SERVER:
 182                         /* gateway servers should not send dhcp
 183                          * requests into the mesh */
 184                         ret = batadv_gw_is_dhcp_target(skb, &header_len);
 185                         if (ret)
 186                                 goto dropped;
 187                         break;
 188                 case GW_MODE_CLIENT:
 189                         /* gateway clients should send dhcp requests
 190                          * via unicast to their gateway */
 191                         ret = batadv_gw_is_dhcp_target(skb, &header_len);
 192                         if (ret)
 193                                 do_bcast = false;
 194                         break;
 195                 case GW_MODE_OFF:
 196                 default:
 197                         break;
 198                 }
 199         }
 200
 201         /* ethernet packet should be broadcasted */
 202         if (do_bcast) {
 203                 primary_if = primary_if_get_selected(bat_priv);
 204                 if (!primary_if)
 205                         goto dropped;
 206
 207                 if (my_skb_head_push(skb, sizeof(*bcast_packet)) < 0)
 208                         goto dropped;
 209
 210                 bcast_packet = (struct bcast_packet *)skb->data;
 211                 bcast_packet->header.version = COMPAT_VERSION;
 212                 bcast_packet->header.ttl = TTL;
 213
 214                 /* batman packet type: broadcast */
 215                 bcast_packet->header.packet_type = BAT_BCAST;
 216
 217                 /* hw address of first interface is the orig mac because only
 218                  * this mac is known throughout the mesh */
 219                 memcpy(bcast_packet->orig,
 220                        primary_if->net_dev->dev_addr, ETH_ALEN);
 221
 222                 /* set broadcast sequence number */
 223                 bcast_packet->seqno =
 224                         htonl(atomic_inc_return(&bat_priv->bcast_seqno));
 225
 226                 add_bcast_packet_to_list(bat_priv, skb, 1);
 227
 228                 /* a copy is stored in the bcast list, therefore removing
 229                  * the original skb. */
 230                 kfree_skb(skb);
 231
 232         /* unicast packet */
 233         } else {
 234                 if (atomic_read(&bat_priv->gw_mode) != GW_MODE_OFF) {
 235                         ret = batadv_gw_out_of_range(bat_priv, skb, ethhdr);
 236                         if (ret)
 237                                 goto dropped;
 238                 }
 239
 240                 ret = unicast_send_skb(skb, bat_priv);
 241                 if (ret != 0)
 242                         goto dropped_freed;
 243         }
 244
 245         bat_priv->stats.tx_packets++;
 246         bat_priv->stats.tx_bytes += data_len;
 247         goto end;
 248
 249 dropped:
 250         kfree_skb(skb);
 251 dropped_freed:
 252         bat_priv->stats.tx_dropped++;
 253 end:
 254         if (primary_if)
 255                 hardif_free_ref(primary_if);
 256         return NETDEV_TX_OK;
 257 }
 258
 259 void interface_rx(struct net_device *soft_iface,
 260                   struct sk_buff *skb, struct hard_iface *recv_if,
 261                   int hdr_size)
 262 {
 263         struct bat_priv *bat_priv = netdev_priv(soft_iface);
 264         struct ethhdr *ethhdr;
 265         struct vlan_ethhdr *vhdr;
 266         short vid __maybe_unused = -1;
 267
 268         /* check if enough space is available for pulling, and pull */
 269         if (!pskb_may_pull(skb, hdr_size))
 270                 goto dropped;
 271
 272         skb_pull_rcsum(skb, hdr_size);
 273         skb_reset_mac_header(skb);
 274
 275         ethhdr = (struct ethhdr *)skb_mac_header(skb);
 276
 277         switch (ntohs(ethhdr->h_proto)) {
 278         case ETH_P_8021Q:
 279                 vhdr = (struct vlan_ethhdr *)skb->data;
 280                 vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;
 281
 282                 if (ntohs(vhdr->h_vlan_encapsulated_proto) != ETH_P_BATMAN)
 283                         break;
 284
 285                 /* fall through */
 286         case ETH_P_BATMAN:
 287                 goto dropped;
 288         }
 289
 290         /* skb->dev & skb->pkt_type are set here */
 291         if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
 292                 goto dropped;
 293         skb->protocol = eth_type_trans(skb, soft_iface);
 294
 295         /* should not be necessary anymore as we use skb_pull_rcsum()
 296          * TODO: please verify this and remove this TODO
 297          * -- Dec 21st 2009, Simon Wunderlich */
 298
 299 /*      skb->ip_summed = CHECKSUM_UNNECESSARY;*/
 300
 301         bat_priv->stats.rx_packets++;
 302         bat_priv->stats.rx_bytes += skb->len + ETH_HLEN;
 303
 304         soft_iface->last_rx = jiffies;
 305
 306         if (is_ap_isolated(bat_priv, ethhdr->h_source, ethhdr->h_dest))
 307                 goto dropped;
 308
 309         /* Let the bridge loop avoidance check the packet. If will
 310          * not handle it, we can safely push it up.
 311          */
 312         if (batadv_bla_rx(bat_priv, skb, vid))
 313                 goto out;
 314
 315         netif_rx(skb);
 316         goto out;
 317
 318 dropped:
 319         kfree_skb(skb);
 320 out:
 321         return;
 322 }
 323
 324 static const struct net_device_ops bat_netdev_ops = {
 325         .ndo_open = interface_open,
 326         .ndo_stop = interface_release,
 327         .ndo_get_stats = interface_stats,
 328         .ndo_set_mac_address = interface_set_mac_addr,
 329         .ndo_change_mtu = interface_change_mtu,
 330         .ndo_start_xmit = interface_tx,
 331         .ndo_validate_addr = eth_validate_addr
 332 };
 333
 334 static void interface_setup(struct net_device *dev)
 335 {
 336         struct bat_priv *priv = netdev_priv(dev);
 337
 338         ether_setup(dev);
 339
 340         dev->netdev_ops = &bat_netdev_ops;
 341         dev->destructor = free_netdev;
 342         dev->tx_queue_len = 0;
 343
 344         /**
 345          * can't call min_mtu, because the needed variables
 346          * have not been initialized yet
 347          */
 348         dev->mtu = ETH_DATA_LEN;
 349         /* reserve more space in the skbuff for our header */
 350         dev->hard_header_len = BAT_HEADER_LEN;
 351
 352         /* generate random address */
 353         eth_hw_addr_random(dev);
 354
 355         SET_ETHTOOL_OPS(dev, &bat_ethtool_ops);
 356
 357         memset(priv, 0, sizeof(*priv));
 358 }
 359
 360 struct net_device *softif_create(const char *name)
 361 {
 362         struct net_device *soft_iface;
 363         struct bat_priv *bat_priv;
 364         int ret;
 365
 366         soft_iface = alloc_netdev(sizeof(*bat_priv), name, interface_setup);
 367
 368         if (!soft_iface)
 369                 goto out;
 370
 371         ret = register_netdevice(soft_iface);
 372         if (ret < 0) {
 373                 pr_err("Unable to register the batman interface '%s': %i\n",
 374                        name, ret);
 375                 goto free_soft_iface;
 376         }
 377
 378         bat_priv = netdev_priv(soft_iface);
 379
 380         atomic_set(&bat_priv->aggregated_ogms, 1);
 381         atomic_set(&bat_priv->bonding, 0);
 382         atomic_set(&bat_priv->bridge_loop_avoidance, 0);
 383         atomic_set(&bat_priv->ap_isolation, 0);
 384         atomic_set(&bat_priv->vis_mode, VIS_TYPE_CLIENT_UPDATE);
 385         atomic_set(&bat_priv->gw_mode, GW_MODE_OFF);
 386         atomic_set(&bat_priv->gw_sel_class, 20);
 387         atomic_set(&bat_priv->gw_bandwidth, 41);
 388         atomic_set(&bat_priv->orig_interval, 1000);
 389         atomic_set(&bat_priv->hop_penalty, 30);
 390         atomic_set(&bat_priv->log_level, 0);
 391         atomic_set(&bat_priv->fragmentation, 1);
 392         atomic_set(&bat_priv->bcast_queue_left, BCAST_QUEUE_LEN);
 393         atomic_set(&bat_priv->batman_queue_left, BATMAN_QUEUE_LEN);
 394
 395         atomic_set(&bat_priv->mesh_state, MESH_INACTIVE);
 396         atomic_set(&bat_priv->bcast_seqno, 1);
 397         atomic_set(&bat_priv->ttvn, 0);
 398         atomic_set(&bat_priv->tt_local_changes, 0);
 399         atomic_set(&bat_priv->tt_ogm_append_cnt, 0);
 400         atomic_set(&bat_priv->bla_num_requests, 0);
 401
 402         bat_priv->tt_buff = NULL;
 403         bat_priv->tt_buff_len = 0;
 404         bat_priv->tt_poss_change = false;
 405
 406         bat_priv->primary_if = NULL;
 407         bat_priv->num_ifaces = 0;
 408
 409         bat_priv->bat_counters = __alloc_percpu(sizeof(uint64_t) * BAT_CNT_NUM,
 410                                                 __alignof__(uint64_t));
 411         if (!bat_priv->bat_counters)
 412                 goto unreg_soft_iface;
 413
 414         ret = bat_algo_select(bat_priv, bat_routing_algo);
 415         if (ret < 0)
 416                 goto free_bat_counters;
 417
 418         ret = batadv_sysfs_add_meshif(soft_iface);
 419         if (ret < 0)
 420                 goto free_bat_counters;
 421
 422         ret = batadv_debugfs_add_meshif(soft_iface);
 423         if (ret < 0)
 424                 goto unreg_sysfs;
 425
 426         ret = mesh_init(soft_iface);
 427         if (ret < 0)
 428                 goto unreg_debugfs;
 429
 430         return soft_iface;
 431
 432 unreg_debugfs:
 433         batadv_debugfs_del_meshif(soft_iface);
 434 unreg_sysfs:
 435         batadv_sysfs_del_meshif(soft_iface);
 436 free_bat_counters:
 437         free_percpu(bat_priv->bat_counters);
 438 unreg_soft_iface:
 439         unregister_netdevice(soft_iface);
 440         return NULL;
 441
 442 free_soft_iface:
 443         free_netdev(soft_iface);
 444 out:
 445         return NULL;
 446 }
 447
 448 void softif_destroy(struct net_device *soft_iface)
 449 {
 450         batadv_debugfs_del_meshif(soft_iface);
 451         batadv_sysfs_del_meshif(soft_iface);
 452         mesh_free(soft_iface);
 453         unregister_netdevice(soft_iface);
 454 }
 455
 456 int softif_is_valid(const struct net_device *net_dev)
 457 {
 458         if (net_dev->netdev_ops->ndo_start_xmit == interface_tx)
 459                 return 1;
 460
 461         return 0;
 462 }
 463
 464 /* ethtool */
 465 static int bat_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 466 {
 467         cmd->supported = 0;
 468         cmd->advertising = 0;
 469         ethtool_cmd_speed_set(cmd, SPEED_10);
 470         cmd->duplex = DUPLEX_FULL;
 471         cmd->port = PORT_TP;
 472         cmd->phy_address = 0;
 473         cmd->transceiver = XCVR_INTERNAL;
 474         cmd->autoneg = AUTONEG_DISABLE;
 475         cmd->maxtxpkt = 0;
 476         cmd->maxrxpkt = 0;
 477
 478         return 0;
 479 }
 480
 481 static void bat_get_drvinfo(struct net_device *dev,
 482                             struct ethtool_drvinfo *info)
 483 {
 484         strcpy(info->driver, "B.A.T.M.A.N. advanced");
 485         strcpy(info->version, SOURCE_VERSION);
 486         strcpy(info->fw_version, "N/A");
 487         strcpy(info->bus_info, "batman");
 488 }
 489
 490 static u32 bat_get_msglevel(struct net_device *dev)
 491 {
 492         return -EOPNOTSUPP;
 493 }
 494
 495 static void bat_set_msglevel(struct net_device *dev, u32 value)
 496 {
 497 }
 498
 499 static u32 bat_get_link(struct net_device *dev)
 500 {
 501         return 1;
 502 }
 503
 504 /* Inspired by drivers/net/ethernet/dlink/sundance.c:1702
 505  * Declare each description string in struct.name[] to get fixed sized buffer
 506  * and compile time checking for strings longer than ETH_GSTRING_LEN.
 507  */
 508 static const struct {
 509         const char name[ETH_GSTRING_LEN];
 510 } bat_counters_strings[] = {
 511         { "forward" },
 512         { "forward_bytes" },
 513         { "mgmt_tx" },
 514         { "mgmt_tx_bytes" },
 515         { "mgmt_rx" },
 516         { "mgmt_rx_bytes" },
 517         { "tt_request_tx" },
 518         { "tt_request_rx" },
 519         { "tt_response_tx" },
 520         { "tt_response_rx" },
 521         { "tt_roam_adv_tx" },
 522         { "tt_roam_adv_rx" },
 523 };
 524
 525 static void batadv_get_strings(struct net_device *dev, uint32_t stringset,
 526                                uint8_t *data)
 527 {
 528         if (stringset == ETH_SS_STATS)
 529                 memcpy(data, bat_counters_strings,
 530                        sizeof(bat_counters_strings));
 531 }
 532
 533 static void batadv_get_ethtool_stats(struct net_device *dev,
 534                                      struct ethtool_stats *stats,
 535                                      uint64_t *data)
 536 {
 537         struct bat_priv *bat_priv = netdev_priv(dev);
 538         int i;
 539
 540         for (i = 0; i < BAT_CNT_NUM; i++)
 541                 data[i] = batadv_sum_counter(bat_priv, i);
 542 }
 543
 544 static int batadv_get_sset_count(struct net_device *dev, int stringset)
 545 {
 546         if (stringset == ETH_SS_STATS)
 547                 return BAT_CNT_NUM;
 548
 549         return -EOPNOTSUPP;
 550 }