drivers/staging/batman-adv/soft-interface.c

   1 /*
   2  * Copyright (C) 2007-2009 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 "send.h"
  26 #include "translation-table.h"
  27 #include "log.h"
  28 #include "types.h"
  29 #include "hash.h"
  30 #include <linux/ethtool.h>
  31 #include <linux/etherdevice.h>
  32 #include "compat.h"
  33
  34 static uint16_t bcast_seqno = 1; /* give own bcast messages seq numbers to avoid
  35                                   * broadcast storms */
  36 static int32_t skb_packets;
  37 static int32_t skb_bad_packets;
  38 static int32_t lock_dropped;
  39
  40 unsigned char mainIfAddr[ETH_ALEN];
  41 static unsigned char mainIfAddr_default[ETH_ALEN];
  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 u32 bat_get_rx_csum(struct net_device *dev);
  49 static int bat_set_rx_csum(struct net_device *dev, u32 data);
  50
  51 static const struct ethtool_ops bat_ethtool_ops = {
  52         .get_settings = bat_get_settings,
  53         .get_drvinfo = bat_get_drvinfo,
  54         .get_msglevel = bat_get_msglevel,
  55         .set_msglevel = bat_set_msglevel,
  56         .get_link = bat_get_link,
  57         .get_rx_csum = bat_get_rx_csum,
  58         .set_rx_csum = bat_set_rx_csum
  59 };
  60
  61 void set_main_if_addr(uint8_t *addr)
  62 {
  63         memcpy(mainIfAddr, addr, ETH_ALEN);
  64 }
  65
  66 int main_if_was_up(void)
  67 {
  68         return (memcmp(mainIfAddr, mainIfAddr_default, ETH_ALEN) != 0 ? 1 : 0);
  69 }
  70
  71 static int my_skb_push(struct sk_buff *skb, unsigned int len)
  72 {
  73         int result = 0;
  74
  75         skb_packets++;
  76         if (skb->data - len < skb->head) {
  77                 skb_bad_packets++;
  78                 result = pskb_expand_head(skb, len, 0, GFP_ATOMIC);
  79
  80                 if (result < 0)
  81                         return result;
  82         }
  83
  84         skb_push(skb, len);
  85         return 0;
  86 }
  87
  88 #ifdef HAVE_NET_DEVICE_OPS
  89 static const struct net_device_ops bat_netdev_ops = {
  90         .ndo_open = interface_open,
  91         .ndo_stop = interface_release,
  92         .ndo_get_stats = interface_stats,
  93         .ndo_set_mac_address = interface_set_mac_addr,
  94         .ndo_change_mtu = interface_change_mtu,
  95         .ndo_start_xmit = interface_tx,
  96         .ndo_validate_addr = eth_validate_addr
  97 };
  98 #endif
  99
 100 void interface_setup(struct net_device *dev)
 101 {
 102         struct bat_priv *priv = netdev_priv(dev);
 103         char dev_addr[ETH_ALEN];
 104
 105         ether_setup(dev);
 106
 107 #ifdef HAVE_NET_DEVICE_OPS
 108         dev->netdev_ops = &bat_netdev_ops;
 109 #else
 110         dev->open = interface_open;
 111         dev->stop = interface_release;
 112         dev->get_stats = interface_stats;
 113         dev->set_mac_address = interface_set_mac_addr;
 114         dev->change_mtu = interface_change_mtu;
 115         dev->hard_start_xmit = interface_tx;
 116 #endif
 117         dev->destructor = free_netdev;
 118
 119         dev->mtu = hardif_min_mtu();
 120         dev->hard_header_len = BAT_HEADER_LEN; /* reserve more space in the
 121                                                 * skbuff for our header */
 122
 123         /* generate random address */
 124         random_ether_addr(dev_addr);
 125         memcpy(dev->dev_addr, dev_addr, sizeof(dev->dev_addr));
 126
 127         SET_ETHTOOL_OPS(dev, &bat_ethtool_ops);
 128
 129         memset(priv, 0, sizeof(struct bat_priv));
 130 }
 131
 132 int interface_open(struct net_device *dev)
 133 {
 134         netif_start_queue(dev);
 135         return 0;
 136 }
 137
 138 int interface_release(struct net_device *dev)
 139 {
 140         netif_stop_queue(dev);
 141         return 0;
 142 }
 143
 144 struct net_device_stats *interface_stats(struct net_device *dev)
 145 {
 146         struct bat_priv *priv = netdev_priv(dev);
 147         return &priv->stats;
 148 }
 149
 150 int interface_set_mac_addr(struct net_device *dev, void *addr)
 151 {
 152         return -EBUSY;
 153 }
 154
 155 int interface_change_mtu(struct net_device *dev, int new_mtu)
 156 {
 157         /* check ranges */
 158         if ((new_mtu < 68) || (new_mtu > hardif_min_mtu()))
 159                 return -EINVAL;
 160
 161         dev->mtu = new_mtu;
 162
 163         return 0;
 164 }
 165
 166 int interface_tx(struct sk_buff *skb, struct net_device *dev)
 167 {
 168         struct unicast_packet *unicast_packet;
 169         struct bcast_packet *bcast_packet;
 170         struct orig_node *orig_node;
 171         struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
 172         struct bat_priv *priv = netdev_priv(dev);
 173         int data_len = skb->len;
 174
 175         if (atomic_read(&module_state) != MODULE_ACTIVE)
 176                 goto dropped;
 177
 178         dev->trans_start = jiffies;
 179         /* TODO: check this for locks */
 180         hna_local_add(ethhdr->h_source);
 181
 182         /* ethernet packet should be broadcasted */
 183         if (is_bcast(ethhdr->h_dest) || is_mcast(ethhdr->h_dest)) {
 184
 185                 if (my_skb_push(skb, sizeof(struct bcast_packet)) < 0)
 186                         goto dropped;
 187
 188                 bcast_packet = (struct bcast_packet *)skb->data;
 189
 190                 bcast_packet->version = COMPAT_VERSION;
 191
 192                 /* batman packet type: broadcast */
 193                 bcast_packet->packet_type = BAT_BCAST;
 194
 195                 /* hw address of first interface is the orig mac because only
 196                  * this mac is known throughout the mesh */
 197                 memcpy(bcast_packet->orig, mainIfAddr, ETH_ALEN);
 198                 /* set broadcast sequence number */
 199                 bcast_packet->seqno = htons(bcast_seqno);
 200
 201                 bcast_seqno++;
 202
 203                 /* broadcast packet */
 204                 add_bcast_packet_to_list(skb->data, skb->len);
 205
 206         /* unicast packet */
 207         } else {
 208
 209                 /* simply spin_lock()ing can deadlock when the lock is already
 210                  * hold. */
 211                 /* TODO: defer the work in a working queue instead of
 212                  * dropping */
 213                 if (!spin_trylock(&orig_hash_lock)) {
 214                         lock_dropped++;
 215                         debug_log(LOG_TYPE_NOTICE, "%d packets dropped because lock was hold\n", lock_dropped);
 216                         goto dropped;
 217                 }
 218
 219                 /* get routing information */
 220                 orig_node = ((struct orig_node *)hash_find(orig_hash,
 221                                                            ethhdr->h_dest));
 222
 223                 /* check for hna host */
 224                 if (!orig_node)
 225                         orig_node = transtable_search(ethhdr->h_dest);
 226
 227                 if ((orig_node) &&
 228                     (orig_node->batman_if) &&
 229                     (orig_node->router)) {
 230                         if (my_skb_push(skb, sizeof(struct unicast_packet)) < 0)
 231                                 goto unlock;
 232
 233                         unicast_packet = (struct unicast_packet *)skb->data;
 234
 235                         unicast_packet->version = COMPAT_VERSION;
 236                         /* batman packet type: unicast */
 237                         unicast_packet->packet_type = BAT_UNICAST;
 238                         /* set unicast ttl */
 239                         unicast_packet->ttl = TTL;
 240                         /* copy the destination for faster routing */
 241                         memcpy(unicast_packet->dest, orig_node->orig, ETH_ALEN);
 242
 243                         /* net_dev won't be available when not active */
 244                         if (orig_node->batman_if->if_active != IF_ACTIVE)
 245                                 goto unlock;
 246
 247                         send_raw_packet(skb->data, skb->len,
 248                                         orig_node->batman_if,
 249                                         orig_node->router->addr);
 250                 } else {
 251                         goto unlock;
 252                 }
 253
 254                 spin_unlock(&orig_hash_lock);
 255         }
 256
 257         priv->stats.tx_packets++;
 258         priv->stats.tx_bytes += data_len;
 259         goto end;
 260
 261 unlock:
 262         spin_unlock(&orig_hash_lock);
 263 dropped:
 264         priv->stats.tx_dropped++;
 265 end:
 266         kfree_skb(skb);
 267         return 0;
 268 }
 269
 270 void interface_rx(struct net_device *dev, void *packet, int packet_len)
 271 {
 272         struct sk_buff *skb;
 273         struct bat_priv *priv = netdev_priv(dev);
 274
 275         skb = dev_alloc_skb(packet_len);
 276
 277         if (!skb) {
 278                 priv->stats.rx_dropped++;
 279                 goto out;
 280         }
 281
 282         memcpy(skb_put(skb, packet_len), packet, packet_len);
 283
 284         /* Write metadata, and then pass to the receive level */
 285         skb->dev = dev;
 286         skb->protocol = eth_type_trans(skb, dev);
 287         skb->ip_summed = CHECKSUM_UNNECESSARY;
 288
 289         priv->stats.rx_packets++;
 290         priv->stats.rx_bytes += packet_len;
 291
 292         dev->last_rx = jiffies;
 293
 294         netif_rx(skb);
 295
 296 out:
 297         return;
 298 }
 299
 300 /* ethtool */
 301 static int bat_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 302 {
 303         cmd->supported = 0;
 304         cmd->advertising = 0;
 305         cmd->speed = SPEED_10;
 306         cmd->duplex = DUPLEX_FULL;
 307         cmd->port = PORT_TP;
 308         cmd->phy_address = 0;
 309         cmd->transceiver = XCVR_INTERNAL;
 310         cmd->autoneg = AUTONEG_DISABLE;
 311         cmd->maxtxpkt = 0;
 312         cmd->maxrxpkt = 0;
 313
 314         return 0;
 315 }
 316
 317 static void bat_get_drvinfo(struct net_device *dev,
 318                             struct ethtool_drvinfo *info)
 319 {
 320         strcpy(info->driver, "B.A.T.M.A.N. advanced");
 321         strcpy(info->version, SOURCE_VERSION);
 322         strcpy(info->fw_version, "N/A");
 323         strcpy(info->bus_info, "batman");
 324 }
 325
 326 static u32 bat_get_msglevel(struct net_device *dev)
 327 {
 328         return -EOPNOTSUPP;
 329 }
 330
 331 static void bat_set_msglevel(struct net_device *dev, u32 value)
 332 {
 333         return;
 334 }
 335
 336 static u32 bat_get_link(struct net_device *dev)
 337 {
 338         return 1;
 339 }
 340
 341 static u32 bat_get_rx_csum(struct net_device *dev)
 342 {
 343         return 0;
 344 }
 345
 346 static int bat_set_rx_csum(struct net_device *dev, u32 data)
 347 {
 348         return -EOPNOTSUPP;
 349 }