linux/net/batman-adv/soft-interface.c
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   1/* Copyright (C) 2007-2012 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, write to the Free Software
  16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  17 * 02110-1301, USA
  18 */
  19
  20#include "main.h"
  21#include "soft-interface.h"
  22#include "hard-interface.h"
  23#include "routing.h"
  24#include "send.h"
  25#include "debugfs.h"
  26#include "translation-table.h"
  27#include "hash.h"
  28#include "gateway_common.h"
  29#include "gateway_client.h"
  30#include "sysfs.h"
  31#include "originator.h"
  32#include <linux/slab.h>
  33#include <linux/ethtool.h>
  34#include <linux/etherdevice.h>
  35#include <linux/if_vlan.h>
  36#include "unicast.h"
  37#include "bridge_loop_avoidance.h"
  38
  39
  40static int batadv_get_settings(struct net_device *dev, struct ethtool_cmd *cmd);
  41static void batadv_get_drvinfo(struct net_device *dev,
  42                               struct ethtool_drvinfo *info);
  43static u32 batadv_get_msglevel(struct net_device *dev);
  44static void batadv_set_msglevel(struct net_device *dev, u32 value);
  45static u32 batadv_get_link(struct net_device *dev);
  46static void batadv_get_strings(struct net_device *dev, u32 stringset, u8 *data);
  47static void batadv_get_ethtool_stats(struct net_device *dev,
  48                                     struct ethtool_stats *stats, u64 *data);
  49static int batadv_get_sset_count(struct net_device *dev, int stringset);
  50
  51static const struct ethtool_ops batadv_ethtool_ops = {
  52        .get_settings = batadv_get_settings,
  53        .get_drvinfo = batadv_get_drvinfo,
  54        .get_msglevel = batadv_get_msglevel,
  55        .set_msglevel = batadv_set_msglevel,
  56        .get_link = batadv_get_link,
  57        .get_strings = batadv_get_strings,
  58        .get_ethtool_stats = batadv_get_ethtool_stats,
  59        .get_sset_count = batadv_get_sset_count,
  60};
  61
  62int batadv_skb_head_push(struct sk_buff *skb, unsigned int len)
  63{
  64        int result;
  65
  66        /* TODO: We must check if we can release all references to non-payload
  67         * data using skb_header_release in our skbs to allow skb_cow_header to
  68         * work optimally. This means that those skbs are not allowed to read
  69         * or write any data which is before the current position of skb->data
  70         * after that call and thus allow other skbs with the same data buffer
  71         * to write freely in that area.
  72         */
  73        result = skb_cow_head(skb, len);
  74        if (result < 0)
  75                return result;
  76
  77        skb_push(skb, len);
  78        return 0;
  79}
  80
  81static int batadv_interface_open(struct net_device *dev)
  82{
  83        netif_start_queue(dev);
  84        return 0;
  85}
  86
  87static int batadv_interface_release(struct net_device *dev)
  88{
  89        netif_stop_queue(dev);
  90        return 0;
  91}
  92
  93static struct net_device_stats *batadv_interface_stats(struct net_device *dev)
  94{
  95        struct batadv_priv *bat_priv = netdev_priv(dev);
  96        struct net_device_stats *stats = &bat_priv->stats;
  97
  98        stats->tx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_TX);
  99        stats->tx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_TX_BYTES);
 100        stats->tx_dropped = batadv_sum_counter(bat_priv, BATADV_CNT_TX_DROPPED);
 101        stats->rx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_RX);
 102        stats->rx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_RX_BYTES);
 103        return stats;
 104}
 105
 106static int batadv_interface_set_mac_addr(struct net_device *dev, void *p)
 107{
 108        struct batadv_priv *bat_priv = netdev_priv(dev);
 109        struct sockaddr *addr = p;
 110        uint8_t old_addr[ETH_ALEN];
 111
 112        if (!is_valid_ether_addr(addr->sa_data))
 113                return -EADDRNOTAVAIL;
 114
 115        memcpy(old_addr, dev->dev_addr, ETH_ALEN);
 116        memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
 117
 118        /* only modify transtable if it has been initialized before */
 119        if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_ACTIVE) {
 120                batadv_tt_local_remove(bat_priv, old_addr,
 121                                       "mac address changed", false);
 122                batadv_tt_local_add(dev, addr->sa_data, BATADV_NULL_IFINDEX);
 123        }
 124
 125        dev->addr_assign_type &= ~NET_ADDR_RANDOM;
 126        return 0;
 127}
 128
 129static int batadv_interface_change_mtu(struct net_device *dev, int new_mtu)
 130{
 131        /* check ranges */
 132        if ((new_mtu < 68) || (new_mtu > batadv_hardif_min_mtu(dev)))
 133                return -EINVAL;
 134
 135        dev->mtu = new_mtu;
 136
 137        return 0;
 138}
 139
 140static int batadv_interface_tx(struct sk_buff *skb,
 141                               struct net_device *soft_iface)
 142{
 143        struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
 144        struct batadv_priv *bat_priv = netdev_priv(soft_iface);
 145        struct batadv_hard_iface *primary_if = NULL;
 146        struct batadv_bcast_packet *bcast_packet;
 147        struct vlan_ethhdr *vhdr;
 148        __be16 ethertype = __constant_htons(BATADV_ETH_P_BATMAN);
 149        static const uint8_t stp_addr[ETH_ALEN] = {0x01, 0x80, 0xC2, 0x00, 0x00,
 150                                                   0x00};
 151        unsigned int header_len = 0;
 152        int data_len = skb->len, ret;
 153        short vid __maybe_unused = -1;
 154        bool do_bcast = false;
 155        uint32_t seqno;
 156
 157        if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
 158                goto dropped;
 159
 160        soft_iface->trans_start = jiffies;
 161
 162        switch (ntohs(ethhdr->h_proto)) {
 163        case ETH_P_8021Q:
 164                vhdr = (struct vlan_ethhdr *)skb->data;
 165                vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;
 166
 167                if (vhdr->h_vlan_encapsulated_proto != ethertype)
 168                        break;
 169
 170                /* fall through */
 171        case BATADV_ETH_P_BATMAN:
 172                goto dropped;
 173        }
 174
 175        if (batadv_bla_tx(bat_priv, skb, vid))
 176                goto dropped;
 177
 178        /* Register the client MAC in the transtable */
 179        batadv_tt_local_add(soft_iface, ethhdr->h_source, skb->skb_iif);
 180
 181        /* don't accept stp packets. STP does not help in meshes.
 182         * better use the bridge loop avoidance ...
 183         */
 184        if (batadv_compare_eth(ethhdr->h_dest, stp_addr))
 185                goto dropped;
 186
 187        if (is_multicast_ether_addr(ethhdr->h_dest)) {
 188                do_bcast = true;
 189
 190                switch (atomic_read(&bat_priv->gw_mode)) {
 191                case BATADV_GW_MODE_SERVER:
 192                        /* gateway servers should not send dhcp
 193                         * requests into the mesh
 194                         */
 195                        ret = batadv_gw_is_dhcp_target(skb, &header_len);
 196                        if (ret)
 197                                goto dropped;
 198                        break;
 199                case BATADV_GW_MODE_CLIENT:
 200                        /* gateway clients should send dhcp requests
 201                         * via unicast to their gateway
 202                         */
 203                        ret = batadv_gw_is_dhcp_target(skb, &header_len);
 204                        if (ret)
 205                                do_bcast = false;
 206                        break;
 207                case BATADV_GW_MODE_OFF:
 208                default:
 209                        break;
 210                }
 211        }
 212
 213        /* ethernet packet should be broadcasted */
 214        if (do_bcast) {
 215                primary_if = batadv_primary_if_get_selected(bat_priv);
 216                if (!primary_if)
 217                        goto dropped;
 218
 219                if (batadv_skb_head_push(skb, sizeof(*bcast_packet)) < 0)
 220                        goto dropped;
 221
 222                bcast_packet = (struct batadv_bcast_packet *)skb->data;
 223                bcast_packet->header.version = BATADV_COMPAT_VERSION;
 224                bcast_packet->header.ttl = BATADV_TTL;
 225
 226                /* batman packet type: broadcast */
 227                bcast_packet->header.packet_type = BATADV_BCAST;
 228                bcast_packet->reserved = 0;
 229
 230                /* hw address of first interface is the orig mac because only
 231                 * this mac is known throughout the mesh
 232                 */
 233                memcpy(bcast_packet->orig,
 234                       primary_if->net_dev->dev_addr, ETH_ALEN);
 235
 236                /* set broadcast sequence number */
 237                seqno = atomic_inc_return(&bat_priv->bcast_seqno);
 238                bcast_packet->seqno = htonl(seqno);
 239
 240                batadv_add_bcast_packet_to_list(bat_priv, skb, 1);
 241
 242                /* a copy is stored in the bcast list, therefore removing
 243                 * the original skb.
 244                 */
 245                kfree_skb(skb);
 246
 247        /* unicast packet */
 248        } else {
 249                if (atomic_read(&bat_priv->gw_mode) != BATADV_GW_MODE_OFF) {
 250                        ret = batadv_gw_out_of_range(bat_priv, skb, ethhdr);
 251                        if (ret)
 252                                goto dropped;
 253                }
 254
 255                ret = batadv_unicast_send_skb(skb, bat_priv);
 256                if (ret != 0)
 257                        goto dropped_freed;
 258        }
 259
 260        batadv_inc_counter(bat_priv, BATADV_CNT_TX);
 261        batadv_add_counter(bat_priv, BATADV_CNT_TX_BYTES, data_len);
 262        goto end;
 263
 264dropped:
 265        kfree_skb(skb);
 266dropped_freed:
 267        batadv_inc_counter(bat_priv, BATADV_CNT_TX_DROPPED);
 268end:
 269        if (primary_if)
 270                batadv_hardif_free_ref(primary_if);
 271        return NETDEV_TX_OK;
 272}
 273
 274void batadv_interface_rx(struct net_device *soft_iface,
 275                         struct sk_buff *skb, struct batadv_hard_iface *recv_if,
 276                         int hdr_size, struct batadv_orig_node *orig_node)
 277{
 278        struct batadv_priv *bat_priv = netdev_priv(soft_iface);
 279        struct ethhdr *ethhdr;
 280        struct vlan_ethhdr *vhdr;
 281        struct batadv_header *batadv_header = (struct batadv_header *)skb->data;
 282        short vid __maybe_unused = -1;
 283        __be16 ethertype = __constant_htons(BATADV_ETH_P_BATMAN);
 284        bool is_bcast;
 285
 286        is_bcast = (batadv_header->packet_type == BATADV_BCAST);
 287
 288        /* check if enough space is available for pulling, and pull */
 289        if (!pskb_may_pull(skb, hdr_size))
 290                goto dropped;
 291
 292        skb_pull_rcsum(skb, hdr_size);
 293        skb_reset_mac_header(skb);
 294
 295        ethhdr = (struct ethhdr *)skb_mac_header(skb);
 296
 297        switch (ntohs(ethhdr->h_proto)) {
 298        case ETH_P_8021Q:
 299                vhdr = (struct vlan_ethhdr *)skb->data;
 300                vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;
 301
 302                if (vhdr->h_vlan_encapsulated_proto != ethertype)
 303                        break;
 304
 305                /* fall through */
 306        case BATADV_ETH_P_BATMAN:
 307                goto dropped;
 308        }
 309
 310        /* skb->dev & skb->pkt_type are set here */
 311        if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
 312                goto dropped;
 313        skb->protocol = eth_type_trans(skb, soft_iface);
 314
 315        /* should not be necessary anymore as we use skb_pull_rcsum()
 316         * TODO: please verify this and remove this TODO
 317         * -- Dec 21st 2009, Simon Wunderlich
 318         */
 319
 320        /* skb->ip_summed = CHECKSUM_UNNECESSARY; */
 321
 322        batadv_inc_counter(bat_priv, BATADV_CNT_RX);
 323        batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES,
 324                           skb->len + ETH_HLEN);
 325
 326        soft_iface->last_rx = jiffies;
 327
 328        /* Let the bridge loop avoidance check the packet. If will
 329         * not handle it, we can safely push it up.
 330         */
 331        if (batadv_bla_rx(bat_priv, skb, vid, is_bcast))
 332                goto out;
 333
 334        if (orig_node)
 335                batadv_tt_add_temporary_global_entry(bat_priv, orig_node,
 336                                                     ethhdr->h_source);
 337
 338        if (batadv_is_ap_isolated(bat_priv, ethhdr->h_source, ethhdr->h_dest))
 339                goto dropped;
 340
 341        netif_rx(skb);
 342        goto out;
 343
 344dropped:
 345        kfree_skb(skb);
 346out:
 347        return;
 348}
 349
 350static const struct net_device_ops batadv_netdev_ops = {
 351        .ndo_open = batadv_interface_open,
 352        .ndo_stop = batadv_interface_release,
 353        .ndo_get_stats = batadv_interface_stats,
 354        .ndo_set_mac_address = batadv_interface_set_mac_addr,
 355        .ndo_change_mtu = batadv_interface_change_mtu,
 356        .ndo_start_xmit = batadv_interface_tx,
 357        .ndo_validate_addr = eth_validate_addr
 358};
 359
 360static void batadv_interface_setup(struct net_device *dev)
 361{
 362        struct batadv_priv *priv = netdev_priv(dev);
 363
 364        ether_setup(dev);
 365
 366        dev->netdev_ops = &batadv_netdev_ops;
 367        dev->destructor = free_netdev;
 368        dev->tx_queue_len = 0;
 369
 370        /* can't call min_mtu, because the needed variables
 371         * have not been initialized yet
 372         */
 373        dev->mtu = ETH_DATA_LEN;
 374        /* reserve more space in the skbuff for our header */
 375        dev->hard_header_len = BATADV_HEADER_LEN;
 376
 377        /* generate random address */
 378        eth_hw_addr_random(dev);
 379
 380        SET_ETHTOOL_OPS(dev, &batadv_ethtool_ops);
 381
 382        memset(priv, 0, sizeof(*priv));
 383}
 384
 385struct net_device *batadv_softif_create(const char *name)
 386{
 387        struct net_device *soft_iface;
 388        struct batadv_priv *bat_priv;
 389        int ret;
 390        size_t cnt_len = sizeof(uint64_t) * BATADV_CNT_NUM;
 391
 392        soft_iface = alloc_netdev(sizeof(*bat_priv), name,
 393                                  batadv_interface_setup);
 394
 395        if (!soft_iface)
 396                goto out;
 397
 398        bat_priv = netdev_priv(soft_iface);
 399
 400        /* batadv_interface_stats() needs to be available as soon as
 401         * register_netdevice() has been called
 402         */
 403        bat_priv->bat_counters = __alloc_percpu(cnt_len, __alignof__(uint64_t));
 404        if (!bat_priv->bat_counters)
 405                goto free_soft_iface;
 406
 407        ret = register_netdevice(soft_iface);
 408        if (ret < 0) {
 409                pr_err("Unable to register the batman interface '%s': %i\n",
 410                       name, ret);
 411                goto free_bat_counters;
 412        }
 413
 414        atomic_set(&bat_priv->aggregated_ogms, 1);
 415        atomic_set(&bat_priv->bonding, 0);
 416        atomic_set(&bat_priv->bridge_loop_avoidance, 0);
 417        atomic_set(&bat_priv->ap_isolation, 0);
 418        atomic_set(&bat_priv->vis_mode, BATADV_VIS_TYPE_CLIENT_UPDATE);
 419        atomic_set(&bat_priv->gw_mode, BATADV_GW_MODE_OFF);
 420        atomic_set(&bat_priv->gw_sel_class, 20);
 421        atomic_set(&bat_priv->gw_bandwidth, 41);
 422        atomic_set(&bat_priv->orig_interval, 1000);
 423        atomic_set(&bat_priv->hop_penalty, 30);
 424        atomic_set(&bat_priv->log_level, 0);
 425        atomic_set(&bat_priv->fragmentation, 1);
 426        atomic_set(&bat_priv->bcast_queue_left, BATADV_BCAST_QUEUE_LEN);
 427        atomic_set(&bat_priv->batman_queue_left, BATADV_BATMAN_QUEUE_LEN);
 428
 429        atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE);
 430        atomic_set(&bat_priv->bcast_seqno, 1);
 431        atomic_set(&bat_priv->tt.vn, 0);
 432        atomic_set(&bat_priv->tt.local_changes, 0);
 433        atomic_set(&bat_priv->tt.ogm_append_cnt, 0);
 434#ifdef CONFIG_BATMAN_ADV_BLA
 435        atomic_set(&bat_priv->bla.num_requests, 0);
 436#endif
 437        bat_priv->tt.last_changeset = NULL;
 438        bat_priv->tt.last_changeset_len = 0;
 439        bat_priv->tt.poss_change = false;
 440
 441        bat_priv->primary_if = NULL;
 442        bat_priv->num_ifaces = 0;
 443
 444        ret = batadv_algo_select(bat_priv, batadv_routing_algo);
 445        if (ret < 0)
 446                goto unreg_soft_iface;
 447
 448        ret = batadv_sysfs_add_meshif(soft_iface);
 449        if (ret < 0)
 450                goto unreg_soft_iface;
 451
 452        ret = batadv_debugfs_add_meshif(soft_iface);
 453        if (ret < 0)
 454                goto unreg_sysfs;
 455
 456        ret = batadv_mesh_init(soft_iface);
 457        if (ret < 0)
 458                goto unreg_debugfs;
 459
 460        return soft_iface;
 461
 462unreg_debugfs:
 463        batadv_debugfs_del_meshif(soft_iface);
 464unreg_sysfs:
 465        batadv_sysfs_del_meshif(soft_iface);
 466unreg_soft_iface:
 467        free_percpu(bat_priv->bat_counters);
 468        unregister_netdevice(soft_iface);
 469        return NULL;
 470
 471free_bat_counters:
 472        free_percpu(bat_priv->bat_counters);
 473free_soft_iface:
 474        free_netdev(soft_iface);
 475out:
 476        return NULL;
 477}
 478
 479void batadv_softif_destroy(struct net_device *soft_iface)
 480{
 481        batadv_debugfs_del_meshif(soft_iface);
 482        batadv_sysfs_del_meshif(soft_iface);
 483        batadv_mesh_free(soft_iface);
 484        unregister_netdevice(soft_iface);
 485}
 486
 487int batadv_softif_is_valid(const struct net_device *net_dev)
 488{
 489        if (net_dev->netdev_ops->ndo_start_xmit == batadv_interface_tx)
 490                return 1;
 491
 492        return 0;
 493}
 494
 495/* ethtool */
 496static int batadv_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 497{
 498        cmd->supported = 0;
 499        cmd->advertising = 0;
 500        ethtool_cmd_speed_set(cmd, SPEED_10);
 501        cmd->duplex = DUPLEX_FULL;
 502        cmd->port = PORT_TP;
 503        cmd->phy_address = 0;
 504        cmd->transceiver = XCVR_INTERNAL;
 505        cmd->autoneg = AUTONEG_DISABLE;
 506        cmd->maxtxpkt = 0;
 507        cmd->maxrxpkt = 0;
 508
 509        return 0;
 510}
 511
 512static void batadv_get_drvinfo(struct net_device *dev,
 513                               struct ethtool_drvinfo *info)
 514{
 515        strcpy(info->driver, "B.A.T.M.A.N. advanced");
 516        strcpy(info->version, BATADV_SOURCE_VERSION);
 517        strcpy(info->fw_version, "N/A");
 518        strcpy(info->bus_info, "batman");
 519}
 520
 521static u32 batadv_get_msglevel(struct net_device *dev)
 522{
 523        return -EOPNOTSUPP;
 524}
 525
 526static void batadv_set_msglevel(struct net_device *dev, u32 value)
 527{
 528}
 529
 530static u32 batadv_get_link(struct net_device *dev)
 531{
 532        return 1;
 533}
 534
 535/* Inspired by drivers/net/ethernet/dlink/sundance.c:1702
 536 * Declare each description string in struct.name[] to get fixed sized buffer
 537 * and compile time checking for strings longer than ETH_GSTRING_LEN.
 538 */
 539static const struct {
 540        const char name[ETH_GSTRING_LEN];
 541} batadv_counters_strings[] = {
 542        { "tx" },
 543        { "tx_bytes" },
 544        { "tx_dropped" },
 545        { "rx" },
 546        { "rx_bytes" },
 547        { "forward" },
 548        { "forward_bytes" },
 549        { "mgmt_tx" },
 550        { "mgmt_tx_bytes" },
 551        { "mgmt_rx" },
 552        { "mgmt_rx_bytes" },
 553        { "tt_request_tx" },
 554        { "tt_request_rx" },
 555        { "tt_response_tx" },
 556        { "tt_response_rx" },
 557        { "tt_roam_adv_tx" },
 558        { "tt_roam_adv_rx" },
 559};
 560
 561static void batadv_get_strings(struct net_device *dev, uint32_t stringset,
 562                               uint8_t *data)
 563{
 564        if (stringset == ETH_SS_STATS)
 565                memcpy(data, batadv_counters_strings,
 566                       sizeof(batadv_counters_strings));
 567}
 568
 569static void batadv_get_ethtool_stats(struct net_device *dev,
 570                                     struct ethtool_stats *stats,
 571                                     uint64_t *data)
 572{
 573        struct batadv_priv *bat_priv = netdev_priv(dev);
 574        int i;
 575
 576        for (i = 0; i < BATADV_CNT_NUM; i++)
 577                data[i] = batadv_sum_counter(bat_priv, i);
 578}
 579
 580static int batadv_get_sset_count(struct net_device *dev, int stringset)
 581{
 582        if (stringset == ETH_SS_STATS)
 583                return BATADV_CNT_NUM;
 584
 585        return -EOPNOTSUPP;
 586}
 587
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