drivers/staging/batman-adv/soft-interface.c - kernel/skids - Git at Google

 /*
  * 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 "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 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;

 	/* 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;
 }

 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;
 	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;

 		/* 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);

 		/* 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);

 		if ((orig_node) &&
 		    (orig_node->router)) {
 			struct neigh_node *router = 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 (router->if_incoming->if_status != IF_ACTIVE)
 				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);

 			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++;
 	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));*/

 	if (unlikely(!pskb_may_pull(skb, ETH_HLEN))) {
 		kfree_skb(skb);
 		return;
 	}
 	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;
 }
	/*
	* 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 "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 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;

	/* 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;
	}

	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;
	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;

	/* 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);

	/* 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);

	if ((orig_node) &&
	(orig_node->router)) {
	struct neigh_node *router = 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 (router->if_incoming->if_status != IF_ACTIVE)
	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);

	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++;
	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));*/

	if (unlikely(!pskb_may_pull(skb, ETH_HLEN))) {
	kfree_skb(skb);
	return;
	}
	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;
	}