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 000000000000..d543f50b647f
--- /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;
+}