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
  32 static uint16_t bcast_seqno = 1; /* give own bcast messages seq numbers to avoid
  33                                   * broadcast storms */
  34 static int32_t skb_packets;
  35 static int32_t skb_bad_packets;
  36
  37 unsigned char mainIfAddr[ETH_ALEN];
  38 static unsigned char mainIfAddr_default[ETH_ALEN];
  39 static int bat_get_settings(struct net_device *dev, struct ethtool_cmd *cmd);
  40 static void bat_get_drvinfo(struct net_device *dev,
  41                             struct ethtool_drvinfo *info);
  42 static u32 bat_get_msglevel(struct net_device *dev);
  43 static void bat_set_msglevel(struct net_device *dev, u32 value);
  44 static u32 bat_get_link(struct net_device *dev);
  45 static u32 bat_get_rx_csum(struct net_device *dev);
  46 static int bat_set_rx_csum(struct net_device *dev, u32 data);
  47
  48 static const struct ethtool_ops bat_ethtool_ops = {
  49         .get_settings = bat_get_settings,
  50         .get_drvinfo = bat_get_drvinfo,
  51         .get_msglevel = bat_get_msglevel,
  52         .set_msglevel = bat_set_msglevel,
  53         .get_link = bat_get_link,
  54         .get_rx_csum = bat_get_rx_csum,
  55         .set_rx_csum = bat_set_rx_csum
  56 };
  57
  58 void set_main_if_addr(uint8_t *addr)
  59 {
  60         memcpy(mainIfAddr, addr, ETH_ALEN);
  61 }
  62
  63 int main_if_was_up(void)
  64 {
  65         return (memcmp(mainIfAddr, mainIfAddr_default, ETH_ALEN) != 0 ? 1 : 0);
  66 }
  67
  68 int my_skb_push(struct sk_buff *skb, unsigned int len)
  69 {
  70         int result = 0;
  71
  72         skb_packets++;
  73         if (skb_headroom(skb) < len) {
  74                 skb_bad_packets++;
  75                 result = pskb_expand_head(skb, len, 0, GFP_ATOMIC);
  76
  77                 if (result < 0)
  78                         return result;
  79         }
  80
  81         skb_push(skb, len);
  82         return 0;
  83 }
  84
  85 #ifdef HAVE_NET_DEVICE_OPS
  86 static const struct net_device_ops bat_netdev_ops = {
  87         .ndo_open = interface_open,
  88         .ndo_stop = interface_release,
  89         .ndo_get_stats = interface_stats,
  90         .ndo_set_mac_address = interface_set_mac_addr,
  91         .ndo_change_mtu = interface_change_mtu,
  92         .ndo_start_xmit = interface_tx,
  93         .ndo_validate_addr = eth_validate_addr
  94 };
  95 #endif
  96
  97 void interface_setup(struct net_device *dev)
  98 {
  99         struct bat_priv *priv = netdev_priv(dev);
 100         char dev_addr[ETH_ALEN];
 101
 102         ether_setup(dev);
 103
 104 #ifdef HAVE_NET_DEVICE_OPS
 105         dev->netdev_ops = &bat_netdev_ops;
 106 #else
 107         dev->open = interface_open;
 108         dev->stop = interface_release;
 109         dev->get_stats = interface_stats;
 110         dev->set_mac_address = interface_set_mac_addr;
 111         dev->change_mtu = interface_change_mtu;
 112         dev->hard_start_xmit = interface_tx;
 113 #endif
 114         dev->destructor = free_netdev;
 115
 116         dev->mtu = hardif_min_mtu();
 117         dev->hard_header_len = BAT_HEADER_LEN; /* reserve more space in the
 118                                                 * skbuff for our header */
 119
 120         /* generate random address */
 121         random_ether_addr(dev_addr);
 122         memcpy(dev->dev_addr, dev_addr, ETH_ALEN);
 123
 124         SET_ETHTOOL_OPS(dev, &bat_ethtool_ops);
 125
 126         memset(priv, 0, sizeof(struct bat_priv));
 127 }
 128
 129 int interface_open(struct net_device *dev)
 130 {
 131         netif_start_queue(dev);
 132         return 0;
 133 }
 134
 135 int interface_release(struct net_device *dev)
 136 {
 137         netif_stop_queue(dev);
 138         return 0;
 139 }
 140
 141 struct net_device_stats *interface_stats(struct net_device *dev)
 142 {
 143         struct bat_priv *priv = netdev_priv(dev);
 144         return &priv->stats;
 145 }
 146
 147 int interface_set_mac_addr(struct net_device *dev, void *p)
 148 {
 149         struct sockaddr *addr = p;
 150
 151         if (!is_valid_ether_addr(addr->sa_data))
 152                 return -EADDRNOTAVAIL;
 153
 154         hna_local_remove(dev->dev_addr, "mac address changed");
 155         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
 156         hna_local_add(dev->dev_addr);
 157
 158         return 0;
 159 }
 160
 161 int interface_change_mtu(struct net_device *dev, int new_mtu)
 162 {
 163         /* check ranges */
 164         if ((new_mtu < 68) || (new_mtu > hardif_min_mtu()))
 165                 return -EINVAL;
 166
 167         dev->mtu = new_mtu;
 168
 169         return 0;
 170 }
 171
 172 int interface_tx(struct sk_buff *skb, struct net_device *dev)
 173 {
 174         struct unicast_packet *unicast_packet;
 175         struct bcast_packet *bcast_packet;
 176         struct orig_node *orig_node;
 177         struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
 178         struct bat_priv *priv = netdev_priv(dev);
 179         struct batman_if *batman_if;
 180         uint8_t dstaddr[6];
 181         int data_len = skb->len;
 182         unsigned long flags;
 183
 184         if (atomic_read(&module_state) != MODULE_ACTIVE)
 185                 goto dropped;
 186
 187         dev->trans_start = jiffies;
 188         /* TODO: check this for locks */
 189         hna_local_add(ethhdr->h_source);
 190
 191         /* ethernet packet should be broadcasted */
 192         if (is_bcast(ethhdr->h_dest) || is_mcast(ethhdr->h_dest)) {
 193
 194                 if (my_skb_push(skb, sizeof(struct bcast_packet)) < 0)
 195                         goto dropped;
 196
 197                 bcast_packet = (struct bcast_packet *)skb->data;
 198                 bcast_packet->version = COMPAT_VERSION;
 199
 200                 /* batman packet type: broadcast */
 201                 bcast_packet->packet_type = BAT_BCAST;
 202
 203                 /* hw address of first interface is the orig mac because only
 204                  * this mac is known throughout the mesh */
 205                 memcpy(bcast_packet->orig, mainIfAddr, ETH_ALEN);
 206
 207                 /* set broadcast sequence number */
 208                 bcast_packet->seqno = htons(bcast_seqno);
 209
 210                 bcast_seqno++;
 211
 212                 /* broadcast packet */
 213                 add_bcast_packet_to_list(skb);
 214                 /* a copy is stored in the bcast list, therefore removing
 215                  * the original skb. */
 216                 kfree_skb(skb);
 217
 218         /* unicast packet */
 219         } else {
 220                 spin_lock_irqsave(&orig_hash_lock, flags);
 221                 /* get routing information */
 222                 orig_node = ((struct orig_node *)hash_find(orig_hash,
 223                                                            ethhdr->h_dest));
 224
 225                 /* check for hna host */
 226                 if (!orig_node)
 227                         orig_node = transtable_search(ethhdr->h_dest);
 228
 229                 if ((orig_node) &&
 230                     (orig_node->batman_if) &&
 231                     (orig_node->router)) {
 232                         if (my_skb_push(skb, sizeof(struct unicast_packet)) < 0)
 233                                 goto unlock;
 234
 235                         unicast_packet = (struct unicast_packet *)skb->data;
 236
 237                         unicast_packet->version = COMPAT_VERSION;
 238                         /* batman packet type: unicast */
 239                         unicast_packet->packet_type = BAT_UNICAST;
 240                         /* set unicast ttl */
 241                         unicast_packet->ttl = TTL;
 242                         /* copy the destination for faster routing */
 243                         memcpy(unicast_packet->dest, orig_node->orig, ETH_ALEN);
 244
 245                         /* net_dev won't be available when not active */
 246                         if (orig_node->batman_if->if_active != IF_ACTIVE)
 247                                 goto unlock;
 248
 249                         /* don't lock while sending the packets ... we therefore
 250                          * copy the required data before sending */
 251
 252                         batman_if = orig_node->batman_if;
 253                         memcpy(dstaddr, orig_node->router->addr, ETH_ALEN);
 254                         spin_unlock_irqrestore(&orig_hash_lock, flags);
 255
 256                         send_skb_packet(skb, batman_if, dstaddr);
 257                 } else {
 258                         goto unlock;
 259                 }
 260         }
 261
 262         priv->stats.tx_packets++;
 263         priv->stats.tx_bytes += data_len;
 264         goto end;
 265
 266 unlock:
 267         spin_unlock_irqrestore(&orig_hash_lock, flags);
 268 dropped:
 269         priv->stats.tx_dropped++;
 270 end:
 271         return NETDEV_TX_OK;
 272 }
 273
 274 void interface_rx(struct sk_buff *skb, int hdr_size)
 275 {
 276         struct net_device *dev = soft_device;
 277         struct bat_priv *priv = netdev_priv(dev);
 278
 279         /* check if enough space is available for pulling, and pull */
 280         if (!pskb_may_pull(skb, hdr_size)) {
 281                 kfree_skb(skb);
 282                 return;
 283         }
 284         skb_pull_rcsum(skb, hdr_size);
 285 /*      skb_set_mac_header(skb, -sizeof(struct ethhdr));*/
 286
 287         skb->dev = dev;
 288         skb->protocol = eth_type_trans(skb, dev);
 289
 290         /* should not be neccesary anymore as we use skb_pull_rcsum()
 291          * TODO: please verify this and remove this TODO
 292          * -- Dec 21st 2009, Simon Wunderlich */
 293
 294 /*      skb->ip_summed = CHECKSUM_UNNECESSARY;*/
 295
 296         /* TODO: set skb->pkt_type to PACKET_BROADCAST, PACKET_MULTICAST,
 297          * PACKET_OTHERHOST or PACKET_HOST */
 298
 299         priv->stats.rx_packets++;
 300         priv->stats.rx_bytes += skb->len;
 301
 302         dev->last_rx = jiffies;
 303
 304         netif_rx(skb);
 305 }
 306
 307 /* ethtool */
 308 static int bat_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 309 {
 310         cmd->supported = 0;
 311         cmd->advertising = 0;
 312         cmd->speed = SPEED_10;
 313         cmd->duplex = DUPLEX_FULL;
 314         cmd->port = PORT_TP;
 315         cmd->phy_address = 0;
 316         cmd->transceiver = XCVR_INTERNAL;
 317         cmd->autoneg = AUTONEG_DISABLE;
 318         cmd->maxtxpkt = 0;
 319         cmd->maxrxpkt = 0;
 320
 321         return 0;
 322 }
 323
 324 static void bat_get_drvinfo(struct net_device *dev,
 325                             struct ethtool_drvinfo *info)
 326 {
 327         strcpy(info->driver, "B.A.T.M.A.N. advanced");
 328         strcpy(info->version, SOURCE_VERSION);
 329         strcpy(info->fw_version, "N/A");
 330         strcpy(info->bus_info, "batman");
 331 }
 332
 333 static u32 bat_get_msglevel(struct net_device *dev)
 334 {
 335         return -EOPNOTSUPP;
 336 }
 337
 338 static void bat_set_msglevel(struct net_device *dev, u32 value)
 339 {
 340 }
 341
 342 static u32 bat_get_link(struct net_device *dev)
 343 {
 344         return 1;
 345 }
 346
 347 static u32 bat_get_rx_csum(struct net_device *dev)
 348 {
 349         return 0;
 350 }
 351
 352 static int bat_set_rx_csum(struct net_device *dev, u32 data)
 353 {
 354         return -EOPNOTSUPP;
 355 }