362 lines
8.9 KiB
C
362 lines
8.9 KiB
C
/*
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* Copyright (C) 2007-2010 B.A.T.M.A.N. contributors:
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*
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* Marek Lindner, Simon Wunderlich
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA
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*
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*/
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#include "main.h"
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#include "soft-interface.h"
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#include "hard-interface.h"
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#include "routing.h"
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#include "send.h"
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#include "translation-table.h"
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#include "types.h"
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#include "hash.h"
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#include <linux/slab.h>
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#include <linux/ethtool.h>
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#include <linux/etherdevice.h>
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static uint32_t bcast_seqno = 1; /* give own bcast messages seq numbers to avoid
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* broadcast storms */
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static int32_t skb_packets;
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static int32_t skb_bad_packets;
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unsigned char main_if_addr[ETH_ALEN];
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static int bat_get_settings(struct net_device *dev, struct ethtool_cmd *cmd);
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static void bat_get_drvinfo(struct net_device *dev,
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struct ethtool_drvinfo *info);
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static u32 bat_get_msglevel(struct net_device *dev);
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static void bat_set_msglevel(struct net_device *dev, u32 value);
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static u32 bat_get_link(struct net_device *dev);
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static u32 bat_get_rx_csum(struct net_device *dev);
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static int bat_set_rx_csum(struct net_device *dev, u32 data);
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static const struct ethtool_ops bat_ethtool_ops = {
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.get_settings = bat_get_settings,
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.get_drvinfo = bat_get_drvinfo,
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.get_msglevel = bat_get_msglevel,
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.set_msglevel = bat_set_msglevel,
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.get_link = bat_get_link,
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.get_rx_csum = bat_get_rx_csum,
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.set_rx_csum = bat_set_rx_csum
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};
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void set_main_if_addr(uint8_t *addr)
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{
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memcpy(main_if_addr, addr, ETH_ALEN);
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}
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int my_skb_push(struct sk_buff *skb, unsigned int len)
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{
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int result = 0;
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skb_packets++;
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if (skb_headroom(skb) < len) {
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skb_bad_packets++;
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result = pskb_expand_head(skb, len, 0, GFP_ATOMIC);
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if (result < 0)
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return result;
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}
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skb_push(skb, len);
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return 0;
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}
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static int interface_open(struct net_device *dev)
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{
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netif_start_queue(dev);
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return 0;
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}
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static int interface_release(struct net_device *dev)
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{
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netif_stop_queue(dev);
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return 0;
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}
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static struct net_device_stats *interface_stats(struct net_device *dev)
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{
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struct bat_priv *priv = netdev_priv(dev);
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return &priv->stats;
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}
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static int interface_set_mac_addr(struct net_device *dev, void *p)
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{
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struct sockaddr *addr = p;
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if (!is_valid_ether_addr(addr->sa_data))
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return -EADDRNOTAVAIL;
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/* only modify hna-table if it has been initialised before */
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if (atomic_read(&module_state) == MODULE_ACTIVE) {
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hna_local_remove(dev->dev_addr, "mac address changed");
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hna_local_add(addr->sa_data);
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}
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memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
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return 0;
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}
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static int interface_change_mtu(struct net_device *dev, int new_mtu)
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{
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/* check ranges */
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if ((new_mtu < 68) || (new_mtu > hardif_min_mtu()))
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return -EINVAL;
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dev->mtu = new_mtu;
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return 0;
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}
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int interface_tx(struct sk_buff *skb, struct net_device *dev)
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{
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struct unicast_packet *unicast_packet;
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struct bcast_packet *bcast_packet;
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struct orig_node *orig_node;
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struct neigh_node *router;
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struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
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struct bat_priv *priv = netdev_priv(dev);
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struct batman_if *batman_if;
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struct bat_priv *bat_priv;
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uint8_t dstaddr[6];
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int data_len = skb->len;
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unsigned long flags;
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if (atomic_read(&module_state) != MODULE_ACTIVE)
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goto dropped;
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/* FIXME: each batman_if will be attached to a softif */
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bat_priv = netdev_priv(soft_device);
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dev->trans_start = jiffies;
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/* TODO: check this for locks */
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hna_local_add(ethhdr->h_source);
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/* ethernet packet should be broadcasted */
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if (is_bcast(ethhdr->h_dest) || is_mcast(ethhdr->h_dest)) {
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if (my_skb_push(skb, sizeof(struct bcast_packet)) < 0)
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goto dropped;
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bcast_packet = (struct bcast_packet *)skb->data;
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bcast_packet->version = COMPAT_VERSION;
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bcast_packet->ttl = TTL;
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/* batman packet type: broadcast */
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bcast_packet->packet_type = BAT_BCAST;
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/* hw address of first interface is the orig mac because only
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* this mac is known throughout the mesh */
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memcpy(bcast_packet->orig, main_if_addr, ETH_ALEN);
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/* set broadcast sequence number */
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bcast_packet->seqno = htonl(bcast_seqno);
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/* broadcast packet. on success, increase seqno. */
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if (add_bcast_packet_to_list(skb) == NETDEV_TX_OK)
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bcast_seqno++;
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/* a copy is stored in the bcast list, therefore removing
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* the original skb. */
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kfree_skb(skb);
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/* unicast packet */
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} else {
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spin_lock_irqsave(&orig_hash_lock, flags);
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/* get routing information */
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orig_node = ((struct orig_node *)hash_find(orig_hash,
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ethhdr->h_dest));
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/* check for hna host */
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if (!orig_node)
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orig_node = transtable_search(ethhdr->h_dest);
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router = find_router(orig_node, NULL);
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if (!router)
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goto unlock;
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/* don't lock while sending the packets ... we therefore
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* copy the required data before sending */
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batman_if = router->if_incoming;
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memcpy(dstaddr, router->addr, ETH_ALEN);
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spin_unlock_irqrestore(&orig_hash_lock, flags);
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if (batman_if->if_status != IF_ACTIVE)
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goto dropped;
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if (my_skb_push(skb, sizeof(struct unicast_packet)) < 0)
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goto dropped;
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unicast_packet = (struct unicast_packet *)skb->data;
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unicast_packet->version = COMPAT_VERSION;
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/* batman packet type: unicast */
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unicast_packet->packet_type = BAT_UNICAST;
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/* set unicast ttl */
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unicast_packet->ttl = TTL;
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/* copy the destination for faster routing */
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memcpy(unicast_packet->dest, orig_node->orig, ETH_ALEN);
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send_skb_packet(skb, batman_if, dstaddr);
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}
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priv->stats.tx_packets++;
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priv->stats.tx_bytes += data_len;
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goto end;
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unlock:
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spin_unlock_irqrestore(&orig_hash_lock, flags);
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dropped:
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priv->stats.tx_dropped++;
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kfree_skb(skb);
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end:
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return NETDEV_TX_OK;
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}
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void interface_rx(struct sk_buff *skb, int hdr_size)
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{
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struct net_device *dev = soft_device;
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struct bat_priv *priv = netdev_priv(dev);
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/* check if enough space is available for pulling, and pull */
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if (!pskb_may_pull(skb, hdr_size)) {
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kfree_skb(skb);
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return;
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}
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skb_pull_rcsum(skb, hdr_size);
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/* skb_set_mac_header(skb, -sizeof(struct ethhdr));*/
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skb->dev = dev;
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skb->protocol = eth_type_trans(skb, dev);
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/* should not be neccesary anymore as we use skb_pull_rcsum()
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* TODO: please verify this and remove this TODO
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* -- Dec 21st 2009, Simon Wunderlich */
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/* skb->ip_summed = CHECKSUM_UNNECESSARY;*/
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/* TODO: set skb->pkt_type to PACKET_BROADCAST, PACKET_MULTICAST,
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* PACKET_OTHERHOST or PACKET_HOST */
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priv->stats.rx_packets++;
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priv->stats.rx_bytes += skb->len;
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dev->last_rx = jiffies;
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netif_rx(skb);
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}
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#ifdef HAVE_NET_DEVICE_OPS
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static const struct net_device_ops bat_netdev_ops = {
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.ndo_open = interface_open,
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.ndo_stop = interface_release,
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.ndo_get_stats = interface_stats,
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.ndo_set_mac_address = interface_set_mac_addr,
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.ndo_change_mtu = interface_change_mtu,
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.ndo_start_xmit = interface_tx,
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.ndo_validate_addr = eth_validate_addr
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};
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#endif
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void interface_setup(struct net_device *dev)
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{
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struct bat_priv *priv = netdev_priv(dev);
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char dev_addr[ETH_ALEN];
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ether_setup(dev);
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#ifdef HAVE_NET_DEVICE_OPS
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dev->netdev_ops = &bat_netdev_ops;
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#else
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dev->open = interface_open;
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dev->stop = interface_release;
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dev->get_stats = interface_stats;
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dev->set_mac_address = interface_set_mac_addr;
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dev->change_mtu = interface_change_mtu;
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dev->hard_start_xmit = interface_tx;
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#endif
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dev->destructor = free_netdev;
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dev->mtu = hardif_min_mtu();
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dev->hard_header_len = BAT_HEADER_LEN; /* reserve more space in the
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* skbuff for our header */
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/* generate random address */
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random_ether_addr(dev_addr);
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memcpy(dev->dev_addr, dev_addr, ETH_ALEN);
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SET_ETHTOOL_OPS(dev, &bat_ethtool_ops);
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memset(priv, 0, sizeof(struct bat_priv));
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}
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/* ethtool */
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static int bat_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
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{
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cmd->supported = 0;
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cmd->advertising = 0;
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cmd->speed = SPEED_10;
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cmd->duplex = DUPLEX_FULL;
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cmd->port = PORT_TP;
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cmd->phy_address = 0;
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cmd->transceiver = XCVR_INTERNAL;
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cmd->autoneg = AUTONEG_DISABLE;
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cmd->maxtxpkt = 0;
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cmd->maxrxpkt = 0;
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return 0;
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}
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static void bat_get_drvinfo(struct net_device *dev,
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struct ethtool_drvinfo *info)
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{
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strcpy(info->driver, "B.A.T.M.A.N. advanced");
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strcpy(info->version, SOURCE_VERSION);
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strcpy(info->fw_version, "N/A");
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strcpy(info->bus_info, "batman");
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}
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static u32 bat_get_msglevel(struct net_device *dev)
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{
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return -EOPNOTSUPP;
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}
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static void bat_set_msglevel(struct net_device *dev, u32 value)
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{
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}
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static u32 bat_get_link(struct net_device *dev)
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{
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return 1;
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}
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static u32 bat_get_rx_csum(struct net_device *dev)
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{
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return 0;
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}
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static int bat_set_rx_csum(struct net_device *dev, u32 data)
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{
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return -EOPNOTSUPP;
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}
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