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 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, ETH_ALEN);
 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 *p)
 149 {
 150         struct sockaddr *addr = p;
 151
 152         if (!is_valid_ether_addr(addr->sa_data))
 153                 return -EADDRNOTAVAIL;
 154
 155         /* only modify hna-table if it has been initialised before */
 156         if (atomic_read(&module_state) == MODULE_ACTIVE) {
 157                 hna_local_remove(dev->dev_addr, "mac address changed");
 158                 hna_local_add(addr->sa_data);
 159         }
 160
 161         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
 162
 163         return 0;
 164 }
 165
 166 int interface_change_mtu(struct net_device *dev, int new_mtu)
 167 {
 168         /* check ranges */
 169         if ((new_mtu < 68) || (new_mtu > hardif_min_mtu()))
 170                 return -EINVAL;
 171
 172         dev->mtu = new_mtu;
 173
 174         return 0;
 175 }
 176
 177 int interface_tx(struct sk_buff *skb, struct net_device *dev)
 178 {
 179         struct unicast_packet *unicast_packet;
 180         struct bcast_packet *bcast_packet;
 181         struct orig_node *orig_node;
 182         struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
 183         struct bat_priv *priv = netdev_priv(dev);
 184         struct batman_if *batman_if;
 185         struct bat_priv *bat_priv;
 186         uint8_t dstaddr[6];
 187         int data_len = skb->len;
 188         unsigned long flags;
 189
 190         if (atomic_read(&module_state) != MODULE_ACTIVE)
 191                 goto dropped;
 192
 193         /* FIXME: each batman_if will be attached to a softif */
 194         bat_priv = netdev_priv(soft_device);
 195
 196         dev->trans_start = jiffies;
 197         /* TODO: check this for locks */
 198         hna_local_add(ethhdr->h_source);
 199
 200         /* ethernet packet should be broadcasted */
 201         if (is_bcast(ethhdr->h_dest) || is_mcast(ethhdr->h_dest)) {
 202
 203                 if (my_skb_push(skb, sizeof(struct bcast_packet)) < 0)
 204                         goto dropped;
 205
 206                 bcast_packet = (struct bcast_packet *)skb->data;
 207                 bcast_packet->version = COMPAT_VERSION;
 208
 209                 /* batman packet type: broadcast */
 210                 bcast_packet->packet_type = BAT_BCAST;
 211
 212                 /* hw address of first interface is the orig mac because only
 213                  * this mac is known throughout the mesh */
 214                 memcpy(bcast_packet->orig, mainIfAddr, ETH_ALEN);
 215
 216                 /* set broadcast sequence number */
 217                 bcast_packet->seqno = htons(bcast_seqno);
 218
 219                 /* broadcast packet. on success, increase seqno. */
 220                 if (add_bcast_packet_to_list(skb) == NETDEV_TX_OK)
 221                         bcast_seqno++;
 222
 223                 /* a copy is stored in the bcast list, therefore removing
 224                  * the original skb. */
 225                 kfree_skb(skb);
 226
 227         /* unicast packet */
 228         } else {
 229                 spin_lock_irqsave(&orig_hash_lock, flags);
 230                 /* get routing information */
 231                 orig_node = ((struct orig_node *)hash_find(orig_hash,
 232                                                            ethhdr->h_dest));
 233
 234                 /* check for hna host */
 235                 if (!orig_node)
 236                         orig_node = transtable_search(ethhdr->h_dest);
 237
 238                 if ((orig_node) &&
 239                     (orig_node->router)) {
 240                         struct neigh_node *router = orig_node->router;
 241
 242                         if (my_skb_push(skb, sizeof(struct unicast_packet)) < 0)
 243                                 goto unlock;
 244
 245                         unicast_packet = (struct unicast_packet *)skb->data;
 246
 247                         unicast_packet->version = COMPAT_VERSION;
 248                         /* batman packet type: unicast */
 249                         unicast_packet->packet_type = BAT_UNICAST;
 250                         /* set unicast ttl */
 251                         unicast_packet->ttl = TTL;
 252                         /* copy the destination for faster routing */
 253                         memcpy(unicast_packet->dest, orig_node->orig, ETH_ALEN);
 254
 255                         /* net_dev won't be available when not active */
 256                         if (router->if_incoming->if_status != IF_ACTIVE)
 257                                 goto unlock;
 258
 259                         /* don't lock while sending the packets ... we therefore
 260                          * copy the required data before sending */
 261
 262                         batman_if = router->if_incoming;
 263                         memcpy(dstaddr, router->addr, ETH_ALEN);
 264                         spin_unlock_irqrestore(&orig_hash_lock, flags);
 265
 266                         send_skb_packet(skb, batman_if, dstaddr);
 267                 } else {
 268                         goto unlock;
 269                 }
 270         }
 271
 272         priv->stats.tx_packets++;
 273         priv->stats.tx_bytes += data_len;
 274         goto end;
 275
 276 unlock:
 277         spin_unlock_irqrestore(&orig_hash_lock, flags);
 278 dropped:
 279         priv->stats.tx_dropped++;
 280         kfree_skb(skb);
 281 end:
 282         return NETDEV_TX_OK;
 283 }
 284
 285 void interface_rx(struct sk_buff *skb, int hdr_size)
 286 {
 287         struct net_device *dev = soft_device;
 288         struct bat_priv *priv = netdev_priv(dev);
 289
 290         /* check if enough space is available for pulling, and pull */
 291         if (!pskb_may_pull(skb, hdr_size)) {
 292                 kfree_skb(skb);
 293                 return;
 294         }
 295         skb_pull_rcsum(skb, hdr_size);
 296 /*      skb_set_mac_header(skb, -sizeof(struct ethhdr));*/
 297
 298         skb->dev = dev;
 299         skb->protocol = eth_type_trans(skb, dev);
 300
 301         /* should not be neccesary anymore as we use skb_pull_rcsum()
 302          * TODO: please verify this and remove this TODO
 303          * -- Dec 21st 2009, Simon Wunderlich */
 304
 305 /*      skb->ip_summed = CHECKSUM_UNNECESSARY;*/
 306
 307         /* TODO: set skb->pkt_type to PACKET_BROADCAST, PACKET_MULTICAST,
 308          * PACKET_OTHERHOST or PACKET_HOST */
 309
 310         priv->stats.rx_packets++;
 311         priv->stats.rx_bytes += skb->len;
 312
 313         dev->last_rx = jiffies;
 314
 315         netif_rx(skb);
 316 }
 317
 318 /* ethtool */
 319 static int bat_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 320 {
 321         cmd->supported = 0;
 322         cmd->advertising = 0;
 323         cmd->speed = SPEED_10;
 324         cmd->duplex = DUPLEX_FULL;
 325         cmd->port = PORT_TP;
 326         cmd->phy_address = 0;
 327         cmd->transceiver = XCVR_INTERNAL;
 328         cmd->autoneg = AUTONEG_DISABLE;
 329         cmd->maxtxpkt = 0;
 330         cmd->maxrxpkt = 0;
 331
 332         return 0;
 333 }
 334
 335 static void bat_get_drvinfo(struct net_device *dev,
 336                             struct ethtool_drvinfo *info)
 337 {
 338         strcpy(info->driver, "B.A.T.M.A.N. advanced");
 339         strcpy(info->version, SOURCE_VERSION);
 340         strcpy(info->fw_version, "N/A");
 341         strcpy(info->bus_info, "batman");
 342 }
 343
 344 static u32 bat_get_msglevel(struct net_device *dev)
 345 {
 346         return -EOPNOTSUPP;
 347 }
 348
 349 static void bat_set_msglevel(struct net_device *dev, u32 value)
 350 {
 351 }
 352
 353 static u32 bat_get_link(struct net_device *dev)
 354 {
 355         return 1;
 356 }
 357
 358 static u32 bat_get_rx_csum(struct net_device *dev)
 359 {
 360         return 0;
 361 }
 362
 363 static int bat_set_rx_csum(struct net_device *dev, u32 data)
 364 {
 365         return -EOPNOTSUPP;
 366 }