diff options
Diffstat (limited to 'drivers/staging/batman-adv/soft-interface.c')
-rw-r--r-- | drivers/staging/batman-adv/soft-interface.c | 349 |
1 files changed, 349 insertions, 0 deletions
diff --git a/drivers/staging/batman-adv/soft-interface.c b/drivers/staging/batman-adv/soft-interface.c new file mode 100644 index 0000000..d543f50 --- /dev/null +++ b/drivers/staging/batman-adv/soft-interface.c @@ -0,0 +1,349 @@ +/* + * Copyright (C) 2007-2009 B.A.T.M.A.N. contributors: + * + * Marek Lindner, Simon Wunderlich + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public + * License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA + * + */ + +#include "main.h" +#include "soft-interface.h" +#include "hard-interface.h" +#include "send.h" +#include "translation-table.h" +#include "log.h" +#include "types.h" +#include "hash.h" +#include <linux/ethtool.h> +#include <linux/etherdevice.h> +#include "compat.h" + +static uint16_t bcast_seqno = 1; /* give own bcast messages seq numbers to avoid + * broadcast storms */ +static int32_t skb_packets; +static int32_t skb_bad_packets; +static int32_t lock_dropped; + +unsigned char mainIfAddr[ETH_ALEN]; +static unsigned char mainIfAddr_default[ETH_ALEN]; +static int bat_get_settings(struct net_device *dev, struct ethtool_cmd *cmd); +static void bat_get_drvinfo(struct net_device *dev, + struct ethtool_drvinfo *info); +static u32 bat_get_msglevel(struct net_device *dev); +static void bat_set_msglevel(struct net_device *dev, u32 value); +static u32 bat_get_link(struct net_device *dev); +static u32 bat_get_rx_csum(struct net_device *dev); +static int bat_set_rx_csum(struct net_device *dev, u32 data); + +static const struct ethtool_ops bat_ethtool_ops = { + .get_settings = bat_get_settings, + .get_drvinfo = bat_get_drvinfo, + .get_msglevel = bat_get_msglevel, + .set_msglevel = bat_set_msglevel, + .get_link = bat_get_link, + .get_rx_csum = bat_get_rx_csum, + .set_rx_csum = bat_set_rx_csum +}; + +void set_main_if_addr(uint8_t *addr) +{ + memcpy(mainIfAddr, addr, ETH_ALEN); +} + +int main_if_was_up(void) +{ + return (memcmp(mainIfAddr, mainIfAddr_default, ETH_ALEN) != 0 ? 1 : 0); +} + +static int my_skb_push(struct sk_buff *skb, unsigned int len) +{ + int result = 0; + + skb_packets++; + if (skb->data - len < skb->head) { + skb_bad_packets++; + result = pskb_expand_head(skb, len, 0, GFP_ATOMIC); + + if (result < 0) + return result; + } + + skb_push(skb, len); + return 0; +} + +#ifdef HAVE_NET_DEVICE_OPS +static const struct net_device_ops bat_netdev_ops = { + .ndo_open = interface_open, + .ndo_stop = interface_release, + .ndo_get_stats = interface_stats, + .ndo_set_mac_address = interface_set_mac_addr, + .ndo_change_mtu = interface_change_mtu, + .ndo_start_xmit = interface_tx, + .ndo_validate_addr = eth_validate_addr +}; +#endif + +void interface_setup(struct net_device *dev) +{ + struct bat_priv *priv = netdev_priv(dev); + char dev_addr[ETH_ALEN]; + + ether_setup(dev); + +#ifdef HAVE_NET_DEVICE_OPS + dev->netdev_ops = &bat_netdev_ops; +#else + dev->open = interface_open; + dev->stop = interface_release; + dev->get_stats = interface_stats; + dev->set_mac_address = interface_set_mac_addr; + dev->change_mtu = interface_change_mtu; + dev->hard_start_xmit = interface_tx; +#endif + dev->destructor = free_netdev; + + dev->mtu = hardif_min_mtu(); + dev->hard_header_len = BAT_HEADER_LEN; /* reserve more space in the + * skbuff for our header */ + + /* generate random address */ + random_ether_addr(dev_addr); + memcpy(dev->dev_addr, dev_addr, sizeof(dev->dev_addr)); + + SET_ETHTOOL_OPS(dev, &bat_ethtool_ops); + + memset(priv, 0, sizeof(struct bat_priv)); +} + +int interface_open(struct net_device *dev) +{ + netif_start_queue(dev); + return 0; +} + +int interface_release(struct net_device *dev) +{ + netif_stop_queue(dev); + return 0; +} + +struct net_device_stats *interface_stats(struct net_device *dev) +{ + struct bat_priv *priv = netdev_priv(dev); + return &priv->stats; +} + +int interface_set_mac_addr(struct net_device *dev, void *addr) +{ + return -EBUSY; +} + +int interface_change_mtu(struct net_device *dev, int new_mtu) +{ + /* check ranges */ + if ((new_mtu < 68) || (new_mtu > hardif_min_mtu())) + return -EINVAL; + + dev->mtu = new_mtu; + + return 0; +} + +int interface_tx(struct sk_buff *skb, struct net_device *dev) +{ + struct unicast_packet *unicast_packet; + struct bcast_packet *bcast_packet; + struct orig_node *orig_node; + struct ethhdr *ethhdr = (struct ethhdr *)skb->data; + struct bat_priv *priv = netdev_priv(dev); + int data_len = skb->len; + + if (atomic_read(&module_state) != MODULE_ACTIVE) + goto dropped; + + dev->trans_start = jiffies; + /* TODO: check this for locks */ + hna_local_add(ethhdr->h_source); + + /* ethernet packet should be broadcasted */ + if (is_bcast(ethhdr->h_dest) || is_mcast(ethhdr->h_dest)) { + + if (my_skb_push(skb, sizeof(struct bcast_packet)) < 0) + goto dropped; + + bcast_packet = (struct bcast_packet *)skb->data; + + bcast_packet->version = COMPAT_VERSION; + + /* batman packet type: broadcast */ + bcast_packet->packet_type = BAT_BCAST; + + /* hw address of first interface is the orig mac because only + * this mac is known throughout the mesh */ + memcpy(bcast_packet->orig, mainIfAddr, ETH_ALEN); + /* set broadcast sequence number */ + bcast_packet->seqno = htons(bcast_seqno); + + bcast_seqno++; + + /* broadcast packet */ + add_bcast_packet_to_list(skb->data, skb->len); + + /* unicast packet */ + } else { + + /* simply spin_lock()ing can deadlock when the lock is already + * hold. */ + /* TODO: defer the work in a working queue instead of + * dropping */ + if (!spin_trylock(&orig_hash_lock)) { + lock_dropped++; + debug_log(LOG_TYPE_NOTICE, "%d packets dropped because lock was hold\n", lock_dropped); + goto dropped; + } + + /* get routing information */ + orig_node = ((struct orig_node *)hash_find(orig_hash, + ethhdr->h_dest)); + + /* check for hna host */ + if (!orig_node) + orig_node = transtable_search(ethhdr->h_dest); + + if ((orig_node) && + (orig_node->batman_if) && + (orig_node->router)) { + if (my_skb_push(skb, sizeof(struct unicast_packet)) < 0) + goto unlock; + + unicast_packet = (struct unicast_packet *)skb->data; + + unicast_packet->version = COMPAT_VERSION; + /* batman packet type: unicast */ + unicast_packet->packet_type = BAT_UNICAST; + /* set unicast ttl */ + unicast_packet->ttl = TTL; + /* copy the destination for faster routing */ + memcpy(unicast_packet->dest, orig_node->orig, ETH_ALEN); + + /* net_dev won't be available when not active */ + if (orig_node->batman_if->if_active != IF_ACTIVE) + goto unlock; + + send_raw_packet(skb->data, skb->len, + orig_node->batman_if, + orig_node->router->addr); + } else { + goto unlock; + } + + spin_unlock(&orig_hash_lock); + } + + priv->stats.tx_packets++; + priv->stats.tx_bytes += data_len; + goto end; + +unlock: + spin_unlock(&orig_hash_lock); +dropped: + priv->stats.tx_dropped++; +end: + kfree_skb(skb); + return 0; +} + +void interface_rx(struct net_device *dev, void *packet, int packet_len) +{ + struct sk_buff *skb; + struct bat_priv *priv = netdev_priv(dev); + + skb = dev_alloc_skb(packet_len); + + if (!skb) { + priv->stats.rx_dropped++; + goto out; + } + + memcpy(skb_put(skb, packet_len), packet, packet_len); + + /* Write metadata, and then pass to the receive level */ + skb->dev = dev; + skb->protocol = eth_type_trans(skb, dev); + skb->ip_summed = CHECKSUM_UNNECESSARY; + + priv->stats.rx_packets++; + priv->stats.rx_bytes += packet_len; + + dev->last_rx = jiffies; + + netif_rx(skb); + +out: + return; +} + +/* ethtool */ +static int bat_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) +{ + cmd->supported = 0; + cmd->advertising = 0; + cmd->speed = SPEED_10; + cmd->duplex = DUPLEX_FULL; + cmd->port = PORT_TP; + cmd->phy_address = 0; + cmd->transceiver = XCVR_INTERNAL; + cmd->autoneg = AUTONEG_DISABLE; + cmd->maxtxpkt = 0; + cmd->maxrxpkt = 0; + + return 0; +} + +static void bat_get_drvinfo(struct net_device *dev, + struct ethtool_drvinfo *info) +{ + strcpy(info->driver, "B.A.T.M.A.N. advanced"); + strcpy(info->version, SOURCE_VERSION); + strcpy(info->fw_version, "N/A"); + strcpy(info->bus_info, "batman"); +} + +static u32 bat_get_msglevel(struct net_device *dev) +{ + return -EOPNOTSUPP; +} + +static void bat_set_msglevel(struct net_device *dev, u32 value) +{ + return; +} + +static u32 bat_get_link(struct net_device *dev) +{ + return 1; +} + +static u32 bat_get_rx_csum(struct net_device *dev) +{ + return 0; +} + +static int bat_set_rx_csum(struct net_device *dev, u32 data) +{ + return -EOPNOTSUPP; +} |