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 "routing.h"
  26 #include "send.h"
  27 #include "translation-table.h"
  28 #include "types.h"
  29 #include "hash.h"
  30 #include <linux/slab.h>
  31 #include <linux/ethtool.h>
  32 #include <linux/etherdevice.h>
  33
  34 static uint32_t bcast_seqno = 1; /* give own bcast messages seq numbers to avoid
  35                                   * broadcast storms */
  36 static int32_t skb_packets;
  37 static int32_t skb_bad_packets;
  38
  39 unsigned char main_if_addr[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(main_if_addr, addr, ETH_ALEN);
  62 }
  63
  64 int my_skb_push(struct sk_buff *skb, unsigned int len)
  65 {
  66         int result = 0;
  67
  68         skb_packets++;
  69         if (skb_headroom(skb) < len) {
  70                 skb_bad_packets++;
  71                 result = pskb_expand_head(skb, len, 0, GFP_ATOMIC);
  72
  73                 if (result < 0)
  74                         return result;
  75         }
  76
  77         skb_push(skb, len);
  78         return 0;
  79 }
  80
  81 static int interface_open(struct net_device *dev)
  82 {
  83         netif_start_queue(dev);
  84         return 0;
  85 }
  86
  87 static int interface_release(struct net_device *dev)
  88 {
  89         netif_stop_queue(dev);
  90         return 0;
  91 }
  92
  93 static struct net_device_stats *interface_stats(struct net_device *dev)
  94 {
  95         struct bat_priv *priv = netdev_priv(dev);
  96         return &priv->stats;
  97 }
  98
  99 static int interface_set_mac_addr(struct net_device *dev, void *p)
 100 {
 101         struct sockaddr *addr = p;
 102
 103         if (!is_valid_ether_addr(addr->sa_data))
 104                 return -EADDRNOTAVAIL;
 105
 106         /* only modify hna-table if it has been initialised before */
 107         if (atomic_read(&module_state) == MODULE_ACTIVE) {
 108                 hna_local_remove(dev->dev_addr, "mac address changed");
 109                 hna_local_add(addr->sa_data);
 110         }
 111
 112         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
 113
 114         return 0;
 115 }
 116
 117 static int interface_change_mtu(struct net_device *dev, int new_mtu)
 118 {
 119         /* check ranges */
 120         if ((new_mtu < 68) || (new_mtu > hardif_min_mtu()))
 121                 return -EINVAL;
 122
 123         dev->mtu = new_mtu;
 124
 125         return 0;
 126 }
 127
 128 int interface_tx(struct sk_buff *skb, struct net_device *dev)
 129 {
 130         struct unicast_packet *unicast_packet;
 131         struct bcast_packet *bcast_packet;
 132         struct orig_node *orig_node;
 133         struct neigh_node *router;
 134         struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
 135         struct bat_priv *priv = netdev_priv(dev);
 136         struct batman_if *batman_if;
 137         struct bat_priv *bat_priv;
 138         uint8_t dstaddr[6];
 139         int data_len = skb->len;
 140         unsigned long flags;
 141
 142         if (atomic_read(&module_state) != MODULE_ACTIVE)
 143                 goto dropped;
 144
 145         /* FIXME: each batman_if will be attached to a softif */
 146         bat_priv = netdev_priv(soft_device);
 147
 148         dev->trans_start = jiffies;
 149         /* TODO: check this for locks */
 150         hna_local_add(ethhdr->h_source);
 151
 152         /* ethernet packet should be broadcasted */
 153         if (is_bcast(ethhdr->h_dest) || is_mcast(ethhdr->h_dest)) {
 154
 155                 if (my_skb_push(skb, sizeof(struct bcast_packet)) < 0)
 156                         goto dropped;
 157
 158                 bcast_packet = (struct bcast_packet *)skb->data;
 159                 bcast_packet->version = COMPAT_VERSION;
 160                 bcast_packet->ttl = TTL;
 161
 162                 /* batman packet type: broadcast */
 163                 bcast_packet->packet_type = BAT_BCAST;
 164
 165                 /* hw address of first interface is the orig mac because only
 166                  * this mac is known throughout the mesh */
 167                 memcpy(bcast_packet->orig, main_if_addr, ETH_ALEN);
 168
 169                 /* set broadcast sequence number */
 170                 bcast_packet->seqno = htonl(bcast_seqno);
 171
 172                 /* broadcast packet. on success, increase seqno. */
 173                 if (add_bcast_packet_to_list(skb) == NETDEV_TX_OK)
 174                         bcast_seqno++;
 175
 176                 /* a copy is stored in the bcast list, therefore removing
 177                  * the original skb. */
 178                 kfree_skb(skb);
 179
 180         /* unicast packet */
 181         } else {
 182                 spin_lock_irqsave(&orig_hash_lock, flags);
 183                 /* get routing information */
 184                 orig_node = ((struct orig_node *)hash_find(orig_hash,
 185                                                            ethhdr->h_dest));
 186
 187                 /* check for hna host */
 188                 if (!orig_node)
 189                         orig_node = transtable_search(ethhdr->h_dest);
 190
 191                 router = find_router(orig_node, NULL);
 192
 193                 if (!router)
 194                         goto unlock;
 195
 196                 /* don't lock while sending the packets ... we therefore
 197                  * copy the required data before sending */
 198
 199                 batman_if = router->if_incoming;
 200                 memcpy(dstaddr, router->addr, ETH_ALEN);
 201
 202                 spin_unlock_irqrestore(&orig_hash_lock, flags);
 203
 204                 if (batman_if->if_status != IF_ACTIVE)
 205                         goto dropped;
 206
 207                 if (my_skb_push(skb, sizeof(struct unicast_packet)) < 0)
 208                         goto dropped;
 209
 210                 unicast_packet = (struct unicast_packet *)skb->data;
 211
 212                 unicast_packet->version = COMPAT_VERSION;
 213                 /* batman packet type: unicast */
 214                 unicast_packet->packet_type = BAT_UNICAST;
 215                 /* set unicast ttl */
 216                 unicast_packet->ttl = TTL;
 217                 /* copy the destination for faster routing */
 218                 memcpy(unicast_packet->dest, orig_node->orig, ETH_ALEN);
 219
 220                 send_skb_packet(skb, batman_if, dstaddr);
 221         }
 222
 223         priv->stats.tx_packets++;
 224         priv->stats.tx_bytes += data_len;
 225         goto end;
 226
 227 unlock:
 228         spin_unlock_irqrestore(&orig_hash_lock, flags);
 229 dropped:
 230         priv->stats.tx_dropped++;
 231         kfree_skb(skb);
 232 end:
 233         return NETDEV_TX_OK;
 234 }
 235
 236 void interface_rx(struct sk_buff *skb, int hdr_size)
 237 {
 238         struct net_device *dev = soft_device;
 239         struct bat_priv *priv = netdev_priv(dev);
 240
 241         /* check if enough space is available for pulling, and pull */
 242         if (!pskb_may_pull(skb, hdr_size)) {
 243                 kfree_skb(skb);
 244                 return;
 245         }
 246         skb_pull_rcsum(skb, hdr_size);
 247 /*      skb_set_mac_header(skb, -sizeof(struct ethhdr));*/
 248
 249         skb->dev = dev;
 250         skb->protocol = eth_type_trans(skb, dev);
 251
 252         /* should not be neccesary anymore as we use skb_pull_rcsum()
 253          * TODO: please verify this and remove this TODO
 254          * -- Dec 21st 2009, Simon Wunderlich */
 255
 256 /*      skb->ip_summed = CHECKSUM_UNNECESSARY;*/
 257
 258         /* TODO: set skb->pkt_type to PACKET_BROADCAST, PACKET_MULTICAST,
 259          * PACKET_OTHERHOST or PACKET_HOST */
 260
 261         priv->stats.rx_packets++;
 262         priv->stats.rx_bytes += skb->len;
 263
 264         dev->last_rx = jiffies;
 265
 266         netif_rx(skb);
 267 }
 268
 269 #ifdef HAVE_NET_DEVICE_OPS
 270 static const struct net_device_ops bat_netdev_ops = {
 271         .ndo_open = interface_open,
 272         .ndo_stop = interface_release,
 273         .ndo_get_stats = interface_stats,
 274         .ndo_set_mac_address = interface_set_mac_addr,
 275         .ndo_change_mtu = interface_change_mtu,
 276         .ndo_start_xmit = interface_tx,
 277         .ndo_validate_addr = eth_validate_addr
 278 };
 279 #endif
 280
 281 void interface_setup(struct net_device *dev)
 282 {
 283         struct bat_priv *priv = netdev_priv(dev);
 284         char dev_addr[ETH_ALEN];
 285
 286         ether_setup(dev);
 287
 288 #ifdef HAVE_NET_DEVICE_OPS
 289         dev->netdev_ops = &bat_netdev_ops;
 290 #else
 291         dev->open = interface_open;
 292         dev->stop = interface_release;
 293         dev->get_stats = interface_stats;
 294         dev->set_mac_address = interface_set_mac_addr;
 295         dev->change_mtu = interface_change_mtu;
 296         dev->hard_start_xmit = interface_tx;
 297 #endif
 298         dev->destructor = free_netdev;
 299
 300         dev->mtu = hardif_min_mtu();
 301         dev->hard_header_len = BAT_HEADER_LEN; /* reserve more space in the
 302                                                 * skbuff for our header */
 303
 304         /* generate random address */
 305         random_ether_addr(dev_addr);
 306         memcpy(dev->dev_addr, dev_addr, ETH_ALEN);
 307
 308         SET_ETHTOOL_OPS(dev, &bat_ethtool_ops);
 309
 310         memset(priv, 0, sizeof(struct bat_priv));
 311 }
 312
 313 /* ethtool */
 314 static int bat_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 315 {
 316         cmd->supported = 0;
 317         cmd->advertising = 0;
 318         cmd->speed = SPEED_10;
 319         cmd->duplex = DUPLEX_FULL;
 320         cmd->port = PORT_TP;
 321         cmd->phy_address = 0;
 322         cmd->transceiver = XCVR_INTERNAL;
 323         cmd->autoneg = AUTONEG_DISABLE;
 324         cmd->maxtxpkt = 0;
 325         cmd->maxrxpkt = 0;
 326
 327         return 0;
 328 }
 329
 330 static void bat_get_drvinfo(struct net_device *dev,
 331                             struct ethtool_drvinfo *info)
 332 {
 333         strcpy(info->driver, "B.A.T.M.A.N. advanced");
 334         strcpy(info->version, SOURCE_VERSION);
 335         strcpy(info->fw_version, "N/A");
 336         strcpy(info->bus_info, "batman");
 337 }
 338
 339 static u32 bat_get_msglevel(struct net_device *dev)
 340 {
 341         return -EOPNOTSUPP;
 342 }
 343
 344 static void bat_set_msglevel(struct net_device *dev, u32 value)
 345 {
 346 }
 347
 348 static u32 bat_get_link(struct net_device *dev)
 349 {
 350         return 1;
 351 }
 352
 353 static u32 bat_get_rx_csum(struct net_device *dev)
 354 {
 355         return 0;
 356 }
 357
 358 static int bat_set_rx_csum(struct net_device *dev, u32 data)
 359 {
 360         return -EOPNOTSUPP;
 361 }