root/trunk/batman-adv-kernelland/soft-interface.c @ 1527

/*
 * 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 "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;

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);
}

int my_skb_push(struct sk_buff *skb, unsigned int len)
{
        int result = 0;

        skb_packets++;
        if (skb_headroom(skb) < len) {
                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, ETH_ALEN);

        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 *p)
{
        struct sockaddr *addr = p;

        if (!is_valid_ether_addr(addr->sa_data))
                return -EADDRNOTAVAIL;

        hna_local_remove(dev->dev_addr, "mac address changed");
        memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
        hna_local_add(dev->dev_addr);

        return 0;
}

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);
        struct batman_if *batman_if;
        uint8_t dstaddr[6];
        int data_len = skb->len;
        unsigned long flags;

        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);
                /* a copy is stored in the bcast list, therefore removing
                 * the original skb. */
                kfree_skb(skb);

        /* unicast packet */
        } else {
                spin_lock_irqsave(&orig_hash_lock, flags);
                /* 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;

                        /* don't lock while sending the packets ... we therefore
                         * copy the required data before sending */

                        batman_if = orig_node->batman_if;
                        memcpy(dstaddr, orig_node->router->addr, ETH_ALEN);
                        spin_unlock_irqrestore(&orig_hash_lock, flags);

                        send_skb_packet(skb, batman_if, dstaddr);
                } else {
                        goto unlock;
                }
        }

        priv->stats.tx_packets++;
        priv->stats.tx_bytes += data_len;
        goto end;

unlock:
        spin_unlock_irqrestore(&orig_hash_lock, flags);
dropped:
        priv->stats.tx_dropped++;
end:
        return NETDEV_TX_OK;
}

void interface_rx(struct sk_buff *skb, int hdr_size)
{
        struct net_device *dev = soft_device;
        struct bat_priv *priv = netdev_priv(dev);

        /* check if enough space is available for pulling, and pull */
        if (!pskb_may_pull(skb, hdr_size)) {
                kfree_skb(skb);
                return;
        }
        skb_pull_rcsum(skb, hdr_size);
/*      skb_set_mac_header(skb, -sizeof(struct ethhdr));*/

        skb->dev = dev;
        skb->protocol = eth_type_trans(skb, dev);

        /* should not be neccesary anymore as we use skb_pull_rcsum()
         * TODO: please verify this and remove this TODO
         * -- Dec 21st 2009, Simon Wunderlich */

/*      skb->ip_summed = CHECKSUM_UNNECESSARY;*/

        /* TODO: set skb->pkt_type to PACKET_BROADCAST, PACKET_MULTICAST,
         * PACKET_OTHERHOST or PACKET_HOST */

        priv->stats.rx_packets++;
        priv->stats.rx_bytes += skb->len;

        dev->last_rx = jiffies;

        netif_rx(skb);
}

/* 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)
{
}

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;
}