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

   1 /*
   2  * Copyright (C) 2007-2010 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/slab.h>
  30 #include <linux/ethtool.h>
  31 #include <linux/etherdevice.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 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 my_skb_push(struct sk_buff *skb, unsigned int len)
  64 {
  65         int result = 0;
  66
  67         skb_packets++;
  68         if (skb_headroom(skb) < len) {
  69                 skb_bad_packets++;
  70                 result = pskb_expand_head(skb, len, 0, GFP_ATOMIC);
  71
  72                 if (result < 0)
  73                         return result;
  74         }
  75
  76         skb_push(skb, len);
  77         return 0;
  78 }
  79
  80 static int interface_open(struct net_device *dev)
  81 {
  82         netif_start_queue(dev);
  83         return 0;
  84 }
  85
  86 static int interface_release(struct net_device *dev)
  87 {
  88         netif_stop_queue(dev);
  89         return 0;
  90 }
  91
  92 static struct net_device_stats *interface_stats(struct net_device *dev)
  93 {
  94         struct bat_priv *priv = netdev_priv(dev);
  95         return &priv->stats;
  96 }
  97
  98 static int interface_set_mac_addr(struct net_device *dev, void *p)
  99 {
 100         struct sockaddr *addr = p;
 101
 102         if (!is_valid_ether_addr(addr->sa_data))
 103                 return -EADDRNOTAVAIL;
 104
 105         /* only modify hna-table if it has been initialised before */
 106         if (atomic_read(&module_state) == MODULE_ACTIVE) {
 107                 hna_local_remove(dev->dev_addr, "mac address changed");
 108                 hna_local_add(addr->sa_data);
 109         }
 110
 111         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
 112
 113         return 0;
 114 }
 115
 116 static int interface_change_mtu(struct net_device *dev, int new_mtu)
 117 {
 118         /* check ranges */
 119         if ((new_mtu < 68) || (new_mtu > hardif_min_mtu()))
 120                 return -EINVAL;
 121
 122         dev->mtu = new_mtu;
 123
 124         return 0;
 125 }
 126
 127 int interface_tx(struct sk_buff *skb, struct net_device *dev)
 128 {
 129         struct unicast_packet *unicast_packet;
 130         struct bcast_packet *bcast_packet;
 131         struct orig_node *orig_node;
 132         struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
 133         struct bat_priv *priv = netdev_priv(dev);
 134         struct batman_if *batman_if;
 135         struct bat_priv *bat_priv;
 136         uint8_t dstaddr[6];
 137         int data_len = skb->len;
 138         unsigned long flags;
 139
 140         if (atomic_read(&module_state) != MODULE_ACTIVE)
 141                 goto dropped;
 142
 143         /* FIXME: each batman_if will be attached to a softif */
 144         bat_priv = netdev_priv(soft_device);
 145
 146         dev->trans_start = jiffies;
 147         /* TODO: check this for locks */
 148         hna_local_add(ethhdr->h_source);
 149
 150         /* ethernet packet should be broadcasted */
 151         if (is_bcast(ethhdr->h_dest) || is_mcast(ethhdr->h_dest)) {
 152
 153                 if (my_skb_push(skb, sizeof(struct bcast_packet)) < 0)
 154                         goto dropped;
 155
 156                 bcast_packet = (struct bcast_packet *)skb->data;
 157                 bcast_packet->version = COMPAT_VERSION;
 158
 159                 /* batman packet type: broadcast */
 160                 bcast_packet->packet_type = BAT_BCAST;
 161
 162                 /* hw address of first interface is the orig mac because only
 163                  * this mac is known throughout the mesh */
 164                 memcpy(bcast_packet->orig, mainIfAddr, ETH_ALEN);
 165
 166                 /* set broadcast sequence number */
 167                 bcast_packet->seqno = htons(bcast_seqno);
 168
 169                 /* broadcast packet. on success, increase seqno. */
 170                 if (add_bcast_packet_to_list(skb) == NETDEV_TX_OK)
 171                         bcast_seqno++;
 172
 173                 /* a copy is stored in the bcast list, therefore removing
 174                  * the original skb. */
 175                 kfree_skb(skb);
 176
 177         /* unicast packet */
 178         } else {
 179                 spin_lock_irqsave(&orig_hash_lock, flags);
 180                 /* get routing information */
 181                 orig_node = ((struct orig_node *)hash_find(orig_hash,
 182                                                            ethhdr->h_dest));
 183
 184                 /* check for hna host */
 185                 if (!orig_node)
 186                         orig_node = transtable_search(ethhdr->h_dest);
 187
 188                 if ((orig_node) &&
 189                     (orig_node->router)) {
 190                         struct neigh_node *router = orig_node->router;
 191
 192                         if (my_skb_push(skb, sizeof(struct unicast_packet)) < 0)
 193                                 goto unlock;
 194
 195                         unicast_packet = (struct unicast_packet *)skb->data;
 196
 197                         unicast_packet->version = COMPAT_VERSION;
 198                         /* batman packet type: unicast */
 199                         unicast_packet->packet_type = BAT_UNICAST;
 200                         /* set unicast ttl */
 201                         unicast_packet->ttl = TTL;
 202                         /* copy the destination for faster routing */
 203                         memcpy(unicast_packet->dest, orig_node->orig, ETH_ALEN);
 204
 205                         /* net_dev won't be available when not active */
 206                         if (router->if_incoming->if_status != IF_ACTIVE)
 207                                 goto unlock;
 208
 209                         /* don't lock while sending the packets ... we therefore
 210                          * copy the required data before sending */
 211
 212                         batman_if = router->if_incoming;
 213                         memcpy(dstaddr, router->addr, ETH_ALEN);
 214                         spin_unlock_irqrestore(&orig_hash_lock, flags);
 215
 216                         send_skb_packet(skb, batman_if, dstaddr);
 217                 } else {
 218                         goto unlock;
 219                 }
 220         }
 221
 222         priv->stats.tx_packets++;
 223         priv->stats.tx_bytes += data_len;
 224         goto end;
 225
 226 unlock:
 227         spin_unlock_irqrestore(&orig_hash_lock, flags);
 228 dropped:
 229         priv->stats.tx_dropped++;
 230         kfree_skb(skb);
 231 end:
 232         return NETDEV_TX_OK;
 233 }
 234
 235 void interface_rx(struct sk_buff *skb, int hdr_size)
 236 {
 237         struct net_device *dev = soft_device;
 238         struct bat_priv *priv = netdev_priv(dev);
 239
 240         /* check if enough space is available for pulling, and pull */
 241         if (!pskb_may_pull(skb, hdr_size)) {
 242                 kfree_skb(skb);
 243                 return;
 244         }
 245         skb_pull_rcsum(skb, hdr_size);
 246 /*      skb_set_mac_header(skb, -sizeof(struct ethhdr));*/
 247
 248         skb->dev = dev;
 249         skb->protocol = eth_type_trans(skb, dev);
 250
 251         /* should not be neccesary anymore as we use skb_pull_rcsum()
 252          * TODO: please verify this and remove this TODO
 253          * -- Dec 21st 2009, Simon Wunderlich */
 254
 255 /*      skb->ip_summed = CHECKSUM_UNNECESSARY;*/
 256
 257         /* TODO: set skb->pkt_type to PACKET_BROADCAST, PACKET_MULTICAST,
 258          * PACKET_OTHERHOST or PACKET_HOST */
 259
 260         priv->stats.rx_packets++;
 261         priv->stats.rx_bytes += skb->len;
 262
 263         dev->last_rx = jiffies;
 264
 265         netif_rx(skb);
 266 }
 267
 268 #ifdef HAVE_NET_DEVICE_OPS
 269 static const struct net_device_ops bat_netdev_ops = {
 270         .ndo_open = interface_open,
 271         .ndo_stop = interface_release,
 272         .ndo_get_stats = interface_stats,
 273         .ndo_set_mac_address = interface_set_mac_addr,
 274         .ndo_change_mtu = interface_change_mtu,
 275         .ndo_start_xmit = interface_tx,
 276         .ndo_validate_addr = eth_validate_addr
 277 };
 278 #endif
 279
 280 void interface_setup(struct net_device *dev)
 281 {
 282         struct bat_priv *priv = netdev_priv(dev);
 283         char dev_addr[ETH_ALEN];
 284
 285         ether_setup(dev);
 286
 287 #ifdef HAVE_NET_DEVICE_OPS
 288         dev->netdev_ops = &bat_netdev_ops;
 289 #else
 290         dev->open = interface_open;
 291         dev->stop = interface_release;
 292         dev->get_stats = interface_stats;
 293         dev->set_mac_address = interface_set_mac_addr;
 294         dev->change_mtu = interface_change_mtu;
 295         dev->hard_start_xmit = interface_tx;
 296 #endif
 297         dev->destructor = free_netdev;
 298
 299         dev->mtu = hardif_min_mtu();
 300         dev->hard_header_len = BAT_HEADER_LEN; /* reserve more space in the
 301                                                 * skbuff for our header */
 302
 303         /* generate random address */
 304         random_ether_addr(dev_addr);
 305         memcpy(dev->dev_addr, dev_addr, ETH_ALEN);
 306
 307         SET_ETHTOOL_OPS(dev, &bat_ethtool_ops);
 308
 309         memset(priv, 0, sizeof(struct bat_priv));
 310 }
 311
 312 /* ethtool */
 313 static int bat_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 314 {
 315         cmd->supported = 0;
 316         cmd->advertising = 0;
 317         cmd->speed = SPEED_10;
 318         cmd->duplex = DUPLEX_FULL;
 319         cmd->port = PORT_TP;
 320         cmd->phy_address = 0;
 321         cmd->transceiver = XCVR_INTERNAL;
 322         cmd->autoneg = AUTONEG_DISABLE;
 323         cmd->maxtxpkt = 0;
 324         cmd->maxrxpkt = 0;
 325
 326         return 0;
 327 }
 328
 329 static void bat_get_drvinfo(struct net_device *dev,
 330                             struct ethtool_drvinfo *info)
 331 {
 332         strcpy(info->driver, "B.A.T.M.A.N. advanced");
 333         strcpy(info->version, SOURCE_VERSION);
 334         strcpy(info->fw_version, "N/A");
 335         strcpy(info->bus_info, "batman");
 336 }
 337
 338 static u32 bat_get_msglevel(struct net_device *dev)
 339 {
 340         return -EOPNOTSUPP;
 341 }
 342
 343 static void bat_set_msglevel(struct net_device *dev, u32 value)
 344 {
 345 }
 346
 347 static u32 bat_get_link(struct net_device *dev)
 348 {
 349         return 1;
 350 }
 351
 352 static u32 bat_get_rx_csum(struct net_device *dev)
 353 {
 354         return 0;
 355 }
 356
 357 static int bat_set_rx_csum(struct net_device *dev, u32 data)
 358 {
 359         return -EOPNOTSUPP;
 360 }