linux/net/batman-adv/soft-interface.c
<<
>>
Prefs
   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        return &bat_priv->stats;
  97}
  98
  99static int batadv_interface_set_mac_addr(struct net_device *dev, void *p)
 100{
 101        struct batadv_priv *bat_priv = netdev_priv(dev);
 102        struct sockaddr *addr = p;
 103        uint8_t old_addr[ETH_ALEN];
 104
 105        if (!is_valid_ether_addr(addr->sa_data))
 106                return -EADDRNOTAVAIL;
 107
 108        memcpy(old_addr, dev->dev_addr, ETH_ALEN);
 109        memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
 110
 111        /* only modify transtable if it has been initialized before */
 112        if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_ACTIVE) {
 113                batadv_tt_local_remove(bat_priv, old_addr,
 114                                       "mac address changed", false);
 115                batadv_tt_local_add(dev, addr->sa_data, BATADV_NULL_IFINDEX);
 116        }
 117
 118        dev->addr_assign_type &= ~NET_ADDR_RANDOM;
 119        return 0;
 120}
 121
 122static int batadv_interface_change_mtu(struct net_device *dev, int new_mtu)
 123{
 124        /* check ranges */
 125        if ((new_mtu < 68) || (new_mtu > batadv_hardif_min_mtu(dev)))
 126                return -EINVAL;
 127
 128        dev->mtu = new_mtu;
 129
 130        return 0;
 131}
 132
 133static int batadv_interface_tx(struct sk_buff *skb,
 134                               struct net_device *soft_iface)
 135{
 136        struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
 137        struct batadv_priv *bat_priv = netdev_priv(soft_iface);
 138        struct batadv_hard_iface *primary_if = NULL;
 139        struct batadv_bcast_packet *bcast_packet;
 140        struct vlan_ethhdr *vhdr;
 141        __be16 ethertype = __constant_htons(BATADV_ETH_P_BATMAN);
 142        static const uint8_t stp_addr[ETH_ALEN] = {0x01, 0x80, 0xC2, 0x00, 0x00,
 143                                                   0x00};
 144        unsigned int header_len = 0;
 145        int data_len = skb->len, ret;
 146        short vid __maybe_unused = -1;
 147        bool do_bcast = false;
 148
 149        if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
 150                goto dropped;
 151
 152        soft_iface->trans_start = jiffies;
 153
 154        switch (ntohs(ethhdr->h_proto)) {
 155        case ETH_P_8021Q:
 156                vhdr = (struct vlan_ethhdr *)skb->data;
 157                vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;
 158
 159                if (vhdr->h_vlan_encapsulated_proto != ethertype)
 160                        break;
 161
 162                /* fall through */
 163        case BATADV_ETH_P_BATMAN:
 164                goto dropped;
 165        }
 166
 167        if (batadv_bla_tx(bat_priv, skb, vid))
 168                goto dropped;
 169
 170        /* Register the client MAC in the transtable */
 171        batadv_tt_local_add(soft_iface, ethhdr->h_source, skb->skb_iif);
 172
 173        /* don't accept stp packets. STP does not help in meshes.
 174         * better use the bridge loop avoidance ...
 175         */
 176        if (batadv_compare_eth(ethhdr->h_dest, stp_addr))
 177                goto dropped;
 178
 179        if (is_multicast_ether_addr(ethhdr->h_dest)) {
 180                do_bcast = true;
 181
 182                switch (atomic_read(&bat_priv->gw_mode)) {
 183                case BATADV_GW_MODE_SERVER:
 184                        /* gateway servers should not send dhcp
 185                         * requests into the mesh
 186                         */
 187                        ret = batadv_gw_is_dhcp_target(skb, &header_len);
 188                        if (ret)
 189                                goto dropped;
 190                        break;
 191                case BATADV_GW_MODE_CLIENT:
 192                        /* gateway clients should send dhcp requests
 193                         * via unicast to their gateway
 194                         */
 195                        ret = batadv_gw_is_dhcp_target(skb, &header_len);
 196                        if (ret)
 197                                do_bcast = false;
 198                        break;
 199                case BATADV_GW_MODE_OFF:
 200                default:
 201                        break;
 202                }
 203        }
 204
 205        /* ethernet packet should be broadcasted */
 206        if (do_bcast) {
 207                primary_if = batadv_primary_if_get_selected(bat_priv);
 208                if (!primary_if)
 209                        goto dropped;
 210
 211                if (batadv_skb_head_push(skb, sizeof(*bcast_packet)) < 0)
 212                        goto dropped;
 213
 214                bcast_packet = (struct batadv_bcast_packet *)skb->data;
 215                bcast_packet->header.version = BATADV_COMPAT_VERSION;
 216                bcast_packet->header.ttl = BATADV_TTL;
 217
 218                /* batman packet type: broadcast */
 219                bcast_packet->header.packet_type = BATADV_BCAST;
 220                bcast_packet->reserved = 0;
 221
 222                /* hw address of first interface is the orig mac because only
 223                 * this mac is known throughout the mesh
 224                 */
 225                memcpy(bcast_packet->orig,
 226                       primary_if->net_dev->dev_addr, ETH_ALEN);
 227
 228                /* set broadcast sequence number */
 229                bcast_packet->seqno =
 230                        htonl(atomic_inc_return(&bat_priv->bcast_seqno));
 231
 232                batadv_add_bcast_packet_to_list(bat_priv, skb, 1);
 233
 234                /* a copy is stored in the bcast list, therefore removing
 235                 * the original skb.
 236                 */
 237                kfree_skb(skb);
 238
 239        /* unicast packet */
 240        } else {
 241                if (atomic_read(&bat_priv->gw_mode) != BATADV_GW_MODE_OFF) {
 242                        ret = batadv_gw_out_of_range(bat_priv, skb, ethhdr);
 243                        if (ret)
 244                                goto dropped;
 245                }
 246
 247                ret = batadv_unicast_send_skb(skb, bat_priv);
 248                if (ret != 0)
 249                        goto dropped_freed;
 250        }
 251
 252        bat_priv->stats.tx_packets++;
 253        bat_priv->stats.tx_bytes += data_len;
 254        goto end;
 255
 256dropped:
 257        kfree_skb(skb);
 258dropped_freed:
 259        bat_priv->stats.tx_dropped++;
 260end:
 261        if (primary_if)
 262                batadv_hardif_free_ref(primary_if);
 263        return NETDEV_TX_OK;
 264}
 265
 266void batadv_interface_rx(struct net_device *soft_iface,
 267                         struct sk_buff *skb, struct batadv_hard_iface *recv_if,
 268                         int hdr_size)
 269{
 270        struct batadv_priv *bat_priv = netdev_priv(soft_iface);
 271        struct ethhdr *ethhdr;
 272        struct vlan_ethhdr *vhdr;
 273        struct batadv_header *batadv_header = (struct batadv_header *)skb->data;
 274        short vid __maybe_unused = -1;
 275        __be16 ethertype = __constant_htons(BATADV_ETH_P_BATMAN);
 276        bool is_bcast;
 277
 278        is_bcast = (batadv_header->packet_type == BATADV_BCAST);
 279
 280        /* check if enough space is available for pulling, and pull */
 281        if (!pskb_may_pull(skb, hdr_size))
 282                goto dropped;
 283
 284        skb_pull_rcsum(skb, hdr_size);
 285        skb_reset_mac_header(skb);
 286
 287        ethhdr = (struct ethhdr *)skb_mac_header(skb);
 288
 289        switch (ntohs(ethhdr->h_proto)) {
 290        case ETH_P_8021Q:
 291                vhdr = (struct vlan_ethhdr *)skb->data;
 292                vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;
 293
 294                if (vhdr->h_vlan_encapsulated_proto != ethertype)
 295                        break;
 296
 297                /* fall through */
 298        case BATADV_ETH_P_BATMAN:
 299                goto dropped;
 300        }
 301
 302        /* skb->dev & skb->pkt_type are set here */
 303        if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
 304                goto dropped;
 305        skb->protocol = eth_type_trans(skb, soft_iface);
 306
 307        /* should not be necessary anymore as we use skb_pull_rcsum()
 308         * TODO: please verify this and remove this TODO
 309         * -- Dec 21st 2009, Simon Wunderlich
 310         */
 311
 312        /* skb->ip_summed = CHECKSUM_UNNECESSARY; */
 313
 314        bat_priv->stats.rx_packets++;
 315        bat_priv->stats.rx_bytes += skb->len + ETH_HLEN;
 316
 317        soft_iface->last_rx = jiffies;
 318
 319        if (batadv_is_ap_isolated(bat_priv, ethhdr->h_source, ethhdr->h_dest))
 320                goto dropped;
 321
 322        /* Let the bridge loop avoidance check the packet. If will
 323         * not handle it, we can safely push it up.
 324         */
 325        if (batadv_bla_rx(bat_priv, skb, vid, is_bcast))
 326                goto out;
 327
 328        netif_rx(skb);
 329        goto out;
 330
 331dropped:
 332        kfree_skb(skb);
 333out:
 334        return;
 335}
 336
 337static const struct net_device_ops batadv_netdev_ops = {
 338        .ndo_open = batadv_interface_open,
 339        .ndo_stop = batadv_interface_release,
 340        .ndo_get_stats = batadv_interface_stats,
 341        .ndo_set_mac_address = batadv_interface_set_mac_addr,
 342        .ndo_change_mtu = batadv_interface_change_mtu,
 343        .ndo_start_xmit = batadv_interface_tx,
 344        .ndo_validate_addr = eth_validate_addr
 345};
 346
 347static void batadv_interface_setup(struct net_device *dev)
 348{
 349        struct batadv_priv *priv = netdev_priv(dev);
 350
 351        ether_setup(dev);
 352
 353        dev->netdev_ops = &batadv_netdev_ops;
 354        dev->destructor = free_netdev;
 355        dev->tx_queue_len = 0;
 356
 357        /* can't call min_mtu, because the needed variables
 358         * have not been initialized yet
 359         */
 360        dev->mtu = ETH_DATA_LEN;
 361        /* reserve more space in the skbuff for our header */
 362        dev->hard_header_len = BATADV_HEADER_LEN;
 363
 364        /* generate random address */
 365        eth_hw_addr_random(dev);
 366
 367        SET_ETHTOOL_OPS(dev, &batadv_ethtool_ops);
 368
 369        memset(priv, 0, sizeof(*priv));
 370}
 371
 372struct net_device *batadv_softif_create(const char *name)
 373{
 374        struct net_device *soft_iface;
 375        struct batadv_priv *bat_priv;
 376        int ret;
 377        size_t cnt_len = sizeof(uint64_t) * BATADV_CNT_NUM;
 378
 379        soft_iface = alloc_netdev(sizeof(*bat_priv), name,
 380                                  batadv_interface_setup);
 381
 382        if (!soft_iface)
 383                goto out;
 384
 385        ret = register_netdevice(soft_iface);
 386        if (ret < 0) {
 387                pr_err("Unable to register the batman interface '%s': %i\n",
 388                       name, ret);
 389                goto free_soft_iface;
 390        }
 391
 392        bat_priv = netdev_priv(soft_iface);
 393
 394        atomic_set(&bat_priv->aggregated_ogms, 1);
 395        atomic_set(&bat_priv->bonding, 0);
 396        atomic_set(&bat_priv->bridge_loop_avoidance, 0);
 397        atomic_set(&bat_priv->ap_isolation, 0);
 398        atomic_set(&bat_priv->vis_mode, BATADV_VIS_TYPE_CLIENT_UPDATE);
 399        atomic_set(&bat_priv->gw_mode, BATADV_GW_MODE_OFF);
 400        atomic_set(&bat_priv->gw_sel_class, 20);
 401        atomic_set(&bat_priv->gw_bandwidth, 41);
 402        atomic_set(&bat_priv->orig_interval, 1000);
 403        atomic_set(&bat_priv->hop_penalty, 30);
 404        atomic_set(&bat_priv->log_level, 0);
 405        atomic_set(&bat_priv->fragmentation, 1);
 406        atomic_set(&bat_priv->bcast_queue_left, BATADV_BCAST_QUEUE_LEN);
 407        atomic_set(&bat_priv->batman_queue_left, BATADV_BATMAN_QUEUE_LEN);
 408
 409        atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE);
 410        atomic_set(&bat_priv->bcast_seqno, 1);
 411        atomic_set(&bat_priv->ttvn, 0);
 412        atomic_set(&bat_priv->tt_local_changes, 0);
 413        atomic_set(&bat_priv->tt_ogm_append_cnt, 0);
 414        atomic_set(&bat_priv->bla_num_requests, 0);
 415
 416        bat_priv->tt_buff = NULL;
 417        bat_priv->tt_buff_len = 0;
 418        bat_priv->tt_poss_change = false;
 419
 420        bat_priv->primary_if = NULL;
 421        bat_priv->num_ifaces = 0;
 422
 423        bat_priv->bat_counters = __alloc_percpu(cnt_len, __alignof__(uint64_t));
 424        if (!bat_priv->bat_counters)
 425                goto unreg_soft_iface;
 426
 427        ret = batadv_algo_select(bat_priv, batadv_routing_algo);
 428        if (ret < 0)
 429                goto free_bat_counters;
 430
 431        ret = batadv_sysfs_add_meshif(soft_iface);
 432        if (ret < 0)
 433                goto free_bat_counters;
 434
 435        ret = batadv_debugfs_add_meshif(soft_iface);
 436        if (ret < 0)
 437                goto unreg_sysfs;
 438
 439        ret = batadv_mesh_init(soft_iface);
 440        if (ret < 0)
 441                goto unreg_debugfs;
 442
 443        return soft_iface;
 444
 445unreg_debugfs:
 446        batadv_debugfs_del_meshif(soft_iface);
 447unreg_sysfs:
 448        batadv_sysfs_del_meshif(soft_iface);
 449free_bat_counters:
 450        free_percpu(bat_priv->bat_counters);
 451unreg_soft_iface:
 452        unregister_netdevice(soft_iface);
 453        return NULL;
 454
 455free_soft_iface:
 456        free_netdev(soft_iface);
 457out:
 458        return NULL;
 459}
 460
 461void batadv_softif_destroy(struct net_device *soft_iface)
 462{
 463        batadv_debugfs_del_meshif(soft_iface);
 464        batadv_sysfs_del_meshif(soft_iface);
 465        batadv_mesh_free(soft_iface);
 466        unregister_netdevice(soft_iface);
 467}
 468
 469int batadv_softif_is_valid(const struct net_device *net_dev)
 470{
 471        if (net_dev->netdev_ops->ndo_start_xmit == batadv_interface_tx)
 472                return 1;
 473
 474        return 0;
 475}
 476
 477/* ethtool */
 478static int batadv_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 479{
 480        cmd->supported = 0;
 481        cmd->advertising = 0;
 482        ethtool_cmd_speed_set(cmd, SPEED_10);
 483        cmd->duplex = DUPLEX_FULL;
 484        cmd->port = PORT_TP;
 485        cmd->phy_address = 0;
 486        cmd->transceiver = XCVR_INTERNAL;
 487        cmd->autoneg = AUTONEG_DISABLE;
 488        cmd->maxtxpkt = 0;
 489        cmd->maxrxpkt = 0;
 490
 491        return 0;
 492}
 493
 494static void batadv_get_drvinfo(struct net_device *dev,
 495                               struct ethtool_drvinfo *info)
 496{
 497        strcpy(info->driver, "B.A.T.M.A.N. advanced");
 498        strcpy(info->version, BATADV_SOURCE_VERSION);
 499        strcpy(info->fw_version, "N/A");
 500        strcpy(info->bus_info, "batman");
 501}
 502
 503static u32 batadv_get_msglevel(struct net_device *dev)
 504{
 505        return -EOPNOTSUPP;
 506}
 507
 508static void batadv_set_msglevel(struct net_device *dev, u32 value)
 509{
 510}
 511
 512static u32 batadv_get_link(struct net_device *dev)
 513{
 514        return 1;
 515}
 516
 517/* Inspired by drivers/net/ethernet/dlink/sundance.c:1702
 518 * Declare each description string in struct.name[] to get fixed sized buffer
 519 * and compile time checking for strings longer than ETH_GSTRING_LEN.
 520 */
 521static const struct {
 522        const char name[ETH_GSTRING_LEN];
 523} batadv_counters_strings[] = {
 524        { "forward" },
 525        { "forward_bytes" },
 526        { "mgmt_tx" },
 527        { "mgmt_tx_bytes" },
 528        { "mgmt_rx" },
 529        { "mgmt_rx_bytes" },
 530        { "tt_request_tx" },
 531        { "tt_request_rx" },
 532        { "tt_response_tx" },
 533        { "tt_response_rx" },
 534        { "tt_roam_adv_tx" },
 535        { "tt_roam_adv_rx" },
 536};
 537
 538static void batadv_get_strings(struct net_device *dev, uint32_t stringset,
 539                               uint8_t *data)
 540{
 541        if (stringset == ETH_SS_STATS)
 542                memcpy(data, batadv_counters_strings,
 543                       sizeof(batadv_counters_strings));
 544}
 545
 546static void batadv_get_ethtool_stats(struct net_device *dev,
 547                                     struct ethtool_stats *stats,
 548                                     uint64_t *data)
 549{
 550        struct batadv_priv *bat_priv = netdev_priv(dev);
 551        int i;
 552
 553        for (i = 0; i < BATADV_CNT_NUM; i++)
 554                data[i] = batadv_sum_counter(bat_priv, i);
 555}
 556
 557static int batadv_get_sset_count(struct net_device *dev, int stringset)
 558{
 559        if (stringset == ETH_SS_STATS)
 560                return BATADV_CNT_NUM;
 561
 562        return -EOPNOTSUPP;
 563}
 564
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.