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
  38 unsigned char mainIfAddr[ETH_ALEN];
  39 static unsigned char mainIfAddr_default[ETH_ALEN];
  40 static int bat_get_settings(struct net_device *dev, struct ethtool_cmd *cmd);
  41 static void bat_get_drvinfo(struct net_device *dev,
  42                             struct ethtool_drvinfo *info);
  43 static u32 bat_get_msglevel(struct net_device *dev);
  44 static void bat_set_msglevel(struct net_device *dev, u32 value);
  45 static u32 bat_get_link(struct net_device *dev);
  46 static u32 bat_get_rx_csum(struct net_device *dev);
  47 static int bat_set_rx_csum(struct net_device *dev, u32 data);
  48
  49 static const struct ethtool_ops bat_ethtool_ops = {
  50         .get_settings = bat_get_settings,
  51         .get_drvinfo = bat_get_drvinfo,
  52         .get_msglevel = bat_get_msglevel,
  53         .set_msglevel = bat_set_msglevel,
  54         .get_link = bat_get_link,
  55         .get_rx_csum = bat_get_rx_csum,
  56         .set_rx_csum = bat_set_rx_csum
  57 };
  58
  59 void set_main_if_addr(uint8_t *addr)
  60 {
  61         memcpy(mainIfAddr, addr, ETH_ALEN);
  62 }
  63
  64 int main_if_was_up(void)
  65 {
  66         return (memcmp(mainIfAddr, mainIfAddr_default, ETH_ALEN) != 0 ? 1 : 0);
  67 }
  68
  69 int my_skb_push(struct sk_buff *skb, unsigned int len)
  70 {
  71         int result = 0;
  72
  73         skb_packets++;
  74         if (skb_headroom(skb) < len) {
  75                 skb_bad_packets++;
  76                 result = pskb_expand_head(skb, len, 0, GFP_ATOMIC);
  77
  78                 if (result < 0)
  79                         return result;
  80         }
  81
  82         skb_push(skb, len);
  83         return 0;
  84 }
  85
  86 #ifdef HAVE_NET_DEVICE_OPS
  87 static const struct net_device_ops bat_netdev_ops = {
  88         .ndo_open = interface_open,
  89         .ndo_stop = interface_release,
  90         .ndo_get_stats = interface_stats,
  91         .ndo_set_mac_address = interface_set_mac_addr,
  92         .ndo_change_mtu = interface_change_mtu,
  93         .ndo_start_xmit = interface_tx,
  94         .ndo_validate_addr = eth_validate_addr
  95 };
  96 #endif
  97
  98 void interface_setup(struct net_device *dev)
  99 {
 100         struct bat_priv *priv = netdev_priv(dev);
 101         char dev_addr[ETH_ALEN];
 102
 103         ether_setup(dev);
 104
 105 #ifdef HAVE_NET_DEVICE_OPS
 106         dev->netdev_ops = &bat_netdev_ops;
 107 #else
 108         dev->open = interface_open;
 109         dev->stop = interface_release;
 110         dev->get_stats = interface_stats;
 111         dev->set_mac_address = interface_set_mac_addr;
 112         dev->change_mtu = interface_change_mtu;
 113         dev->hard_start_xmit = interface_tx;
 114 #endif
 115         dev->destructor = free_netdev;
 116
 117         dev->mtu = hardif_min_mtu();
 118         dev->hard_header_len = BAT_HEADER_LEN; /* reserve more space in the
 119                                                 * skbuff for our header */
 120
 121         /* generate random address */
 122         random_ether_addr(dev_addr);
 123         memcpy(dev->dev_addr, dev_addr, sizeof(dev->dev_addr));
 124
 125         SET_ETHTOOL_OPS(dev, &bat_ethtool_ops);
 126
 127         memset(priv, 0, sizeof(struct bat_priv));
 128 }
 129
 130 int interface_open(struct net_device *dev)
 131 {
 132         netif_start_queue(dev);
 133         return 0;
 134 }
 135
 136 int interface_release(struct net_device *dev)
 137 {
 138         netif_stop_queue(dev);
 139         return 0;
 140 }
 141
 142 struct net_device_stats *interface_stats(struct net_device *dev)
 143 {
 144         struct bat_priv *priv = netdev_priv(dev);
 145         return &priv->stats;
 146 }
 147
 148 int interface_set_mac_addr(struct net_device *dev, void *addr)
 149 {
 150         return -EBUSY;
 151 }
 152
 153 int interface_change_mtu(struct net_device *dev, int new_mtu)
 154 {
 155         /* check ranges */
 156         if ((new_mtu < 68) || (new_mtu > hardif_min_mtu()))
 157                 return -EINVAL;
 158
 159         dev->mtu = new_mtu;
 160
 161         return 0;
 162 }
 163
 164 int interface_tx(struct sk_buff *skb, struct net_device *dev)
 165 {
 166         struct unicast_packet *unicast_packet;
 167         struct bcast_packet *bcast_packet;
 168         struct orig_node *orig_node;
 169         struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
 170         struct bat_priv *priv = netdev_priv(dev);
 171         struct batman_if *batman_if;
 172         uint8_t dstaddr[6];
 173         int data_len = skb->len;
 174         unsigned long flags;
 175
 176         if (atomic_read(&module_state) != MODULE_ACTIVE)
 177                 goto dropped;
 178
 179         dev->trans_start = jiffies;
 180         /* TODO: check this for locks */
 181         hna_local_add(ethhdr->h_source);
 182
 183         /* ethernet packet should be broadcasted */
 184         if (is_bcast(ethhdr->h_dest) || is_mcast(ethhdr->h_dest)) {
 185
 186                 if (my_skb_push(skb, sizeof(struct bcast_packet)) < 0)
 187                         goto dropped;
 188
 189                 bcast_packet = (struct bcast_packet *)skb->data;
 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
 199                 /* set broadcast sequence number */
 200                 bcast_packet->seqno = htons(bcast_seqno);
 201
 202                 bcast_seqno++;
 203
 204                 /* broadcast packet */
 205                 add_bcast_packet_to_list(skb);
 206                 /* a copy is stored in the bcast list, therefore removing
 207                  * the original skb. */
 208                 kfree_skb(skb);
 209
 210         /* unicast packet */
 211         } else {
 212                 spin_lock_irqsave(&orig_hash_lock, flags);
 213                 /* get routing information */
 214                 orig_node = ((struct orig_node *)hash_find(orig_hash,
 215                                                            ethhdr->h_dest));
 216
 217                 /* check for hna host */
 218                 if (!orig_node)
 219                         orig_node = transtable_search(ethhdr->h_dest);
 220
 221                 if ((orig_node) &&
 222                     (orig_node->batman_if) &&
 223                     (orig_node->router)) {
 224                         if (my_skb_push(skb, sizeof(struct unicast_packet)) < 0)
 225                                 goto unlock;
 226
 227                         unicast_packet = (struct unicast_packet *)skb->data;
 228
 229                         unicast_packet->version = COMPAT_VERSION;
 230                         /* batman packet type: unicast */
 231                         unicast_packet->packet_type = BAT_UNICAST;
 232                         /* set unicast ttl */
 233                         unicast_packet->ttl = TTL;
 234                         /* copy the destination for faster routing */
 235                         memcpy(unicast_packet->dest, orig_node->orig, ETH_ALEN);
 236
 237                         /* net_dev won't be available when not active */
 238                         if (orig_node->batman_if->if_active != IF_ACTIVE)
 239                                 goto unlock;
 240
 241                         /* don't lock while sending the packets ... we therefore
 242                          * copy the required data before sending */
 243
 244                         batman_if = orig_node->batman_if;
 245                         memcpy(dstaddr, orig_node->router->addr, ETH_ALEN);
 246                         spin_unlock_irqrestore(&orig_hash_lock, flags);
 247
 248                         send_skb_packet(skb, batman_if, dstaddr);
 249                 } else {
 250                         goto unlock;
 251                 }
 252         }
 253
 254         priv->stats.tx_packets++;
 255         priv->stats.tx_bytes += data_len;
 256         goto end;
 257
 258 unlock:
 259         spin_unlock_irqrestore(&orig_hash_lock, flags);
 260 dropped:
 261         priv->stats.tx_dropped++;
 262 end:
 263         return 0;
 264 }
 265
 266 void interface_rx(struct sk_buff *skb, int hdr_size)
 267 {
 268         struct net_device *dev = soft_device;
 269         struct bat_priv *priv = netdev_priv(dev);
 270
 271         /* check if enough space is available for pulling, and pull */
 272         if (!pskb_may_pull(skb, hdr_size)) {
 273                 kfree_skb(skb);
 274                 return;
 275         }
 276         skb_pull_rcsum(skb, hdr_size);
 277 /*      skb_set_mac_header(skb, -sizeof(struct ethhdr));*/
 278
 279         skb->dev = dev;
 280         skb->protocol = eth_type_trans(skb, dev);
 281
 282         /* should not be neccesary anymore as we use skb_pull_rcsum()
 283          * TODO: please verify this and remove this TODO
 284          * -- Dec 21st 2009, Simon Wunderlich */
 285
 286 /*      skb->ip_summed = CHECKSUM_UNNECESSARY;*/
 287
 288         /* TODO: set skb->pkt_type to PACKET_BROADCAST, PACKET_MULTICAST,
 289          * PACKET_OTHERHOST or PACKET_HOST */
 290
 291         priv->stats.rx_packets++;
 292         priv->stats.rx_bytes += skb->len;
 293
 294         dev->last_rx = jiffies;
 295
 296         netif_rx(skb);
 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 }