blob: 2ea97de435ceab80b9c4838d66474bc064dbcb54 [file] [log] [blame]
/*
* Copyright (C) 2007-2010 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 "routing.h"
#include "send.h"
#include "translation-table.h"
#include "types.h"
#include "hash.h"
#include <linux/slab.h>
#include <linux/ethtool.h>
#include <linux/etherdevice.h>
static uint32_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 main_if_addr[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(main_if_addr, addr, ETH_ALEN);
}
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;
}
static int interface_open(struct net_device *dev)
{
netif_start_queue(dev);
return 0;
}
static int interface_release(struct net_device *dev)
{
netif_stop_queue(dev);
return 0;
}
static struct net_device_stats *interface_stats(struct net_device *dev)
{
struct bat_priv *priv = netdev_priv(dev);
return &priv->stats;
}
static 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;
/* only modify hna-table if it has been initialised before */
if (atomic_read(&module_state) == MODULE_ACTIVE) {
hna_local_remove(dev->dev_addr, "mac address changed");
hna_local_add(addr->sa_data);
}
memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
return 0;
}
static 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 neigh_node *router;
struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
struct bat_priv *priv = netdev_priv(dev);
struct batman_if *batman_if;
struct bat_priv *bat_priv;
uint8_t dstaddr[6];
int data_len = skb->len;
unsigned long flags;
if (atomic_read(&module_state) != MODULE_ACTIVE)
goto dropped;
/* FIXME: each batman_if will be attached to a softif */
bat_priv = netdev_priv(soft_device);
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;
bcast_packet->ttl = TTL;
/* 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, main_if_addr, ETH_ALEN);
/* set broadcast sequence number */
bcast_packet->seqno = htonl(bcast_seqno);
/* broadcast packet. on success, increase seqno. */
if (add_bcast_packet_to_list(skb) == NETDEV_TX_OK)
bcast_seqno++;
/* 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);
router = find_router(orig_node, NULL);
if (!router)
goto unlock;
/* don't lock while sending the packets ... we therefore
* copy the required data before sending */
batman_if = router->if_incoming;
memcpy(dstaddr, router->addr, ETH_ALEN);
spin_unlock_irqrestore(&orig_hash_lock, flags);
if (batman_if->if_status != IF_ACTIVE)
goto dropped;
if (my_skb_push(skb, sizeof(struct unicast_packet)) < 0)
goto dropped;
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);
send_skb_packet(skb, batman_if, dstaddr);
}
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++;
kfree_skb(skb);
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);
}
#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));
}
/* 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;
}