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