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Fixes generated by 'codespell' and manually reviewed. Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
687 lines
17 KiB
C
687 lines
17 KiB
C
/*
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* Copyright (C) 2007-2011 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 "bat_debugfs.h"
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#include "translation-table.h"
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#include "hash.h"
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#include "gateway_common.h"
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#include "gateway_client.h"
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#include "bat_sysfs.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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#include <linux/if_vlan.h>
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#include "unicast.h"
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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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int my_skb_head_push(struct sk_buff *skb, unsigned int len)
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{
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int result;
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/**
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* TODO: We must check if we can release all references to non-payload
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* data using skb_header_release in our skbs to allow skb_cow_header to
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* work optimally. This means that those skbs are not allowed to read
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* or write any data which is before the current position of skb->data
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* after that call and thus allow other skbs with the same data buffer
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* to write freely in that area.
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*/
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result = skb_cow_head(skb, len);
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if (result < 0)
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return result;
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skb_push(skb, len);
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return 0;
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}
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static void softif_neigh_free_rcu(struct rcu_head *rcu)
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{
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struct softif_neigh *softif_neigh;
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softif_neigh = container_of(rcu, struct softif_neigh, rcu);
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kfree(softif_neigh);
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}
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static void softif_neigh_free_ref(struct softif_neigh *softif_neigh)
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{
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if (atomic_dec_and_test(&softif_neigh->refcount))
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call_rcu(&softif_neigh->rcu, softif_neigh_free_rcu);
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}
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void softif_neigh_purge(struct bat_priv *bat_priv)
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{
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struct softif_neigh *softif_neigh, *softif_neigh_tmp;
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struct hlist_node *node, *node_tmp;
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spin_lock_bh(&bat_priv->softif_neigh_lock);
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hlist_for_each_entry_safe(softif_neigh, node, node_tmp,
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&bat_priv->softif_neigh_list, list) {
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if ((!time_after(jiffies, softif_neigh->last_seen +
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msecs_to_jiffies(SOFTIF_NEIGH_TIMEOUT))) &&
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(atomic_read(&bat_priv->mesh_state) == MESH_ACTIVE))
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continue;
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hlist_del_rcu(&softif_neigh->list);
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if (bat_priv->softif_neigh == softif_neigh) {
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bat_dbg(DBG_ROUTES, bat_priv,
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"Current mesh exit point '%pM' vanished "
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"(vid: %d).\n",
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softif_neigh->addr, softif_neigh->vid);
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softif_neigh_tmp = bat_priv->softif_neigh;
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bat_priv->softif_neigh = NULL;
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softif_neigh_free_ref(softif_neigh_tmp);
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}
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softif_neigh_free_ref(softif_neigh);
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}
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spin_unlock_bh(&bat_priv->softif_neigh_lock);
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}
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static struct softif_neigh *softif_neigh_get(struct bat_priv *bat_priv,
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uint8_t *addr, short vid)
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{
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struct softif_neigh *softif_neigh;
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struct hlist_node *node;
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rcu_read_lock();
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hlist_for_each_entry_rcu(softif_neigh, node,
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&bat_priv->softif_neigh_list, list) {
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if (!compare_eth(softif_neigh->addr, addr))
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continue;
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if (softif_neigh->vid != vid)
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continue;
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if (!atomic_inc_not_zero(&softif_neigh->refcount))
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continue;
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softif_neigh->last_seen = jiffies;
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goto out;
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}
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softif_neigh = kzalloc(sizeof(struct softif_neigh), GFP_ATOMIC);
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if (!softif_neigh)
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goto out;
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memcpy(softif_neigh->addr, addr, ETH_ALEN);
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softif_neigh->vid = vid;
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softif_neigh->last_seen = jiffies;
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/* initialize with 2 - caller decrements counter by one */
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atomic_set(&softif_neigh->refcount, 2);
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INIT_HLIST_NODE(&softif_neigh->list);
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spin_lock_bh(&bat_priv->softif_neigh_lock);
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hlist_add_head_rcu(&softif_neigh->list, &bat_priv->softif_neigh_list);
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spin_unlock_bh(&bat_priv->softif_neigh_lock);
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out:
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rcu_read_unlock();
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return softif_neigh;
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}
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int softif_neigh_seq_print_text(struct seq_file *seq, void *offset)
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{
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struct net_device *net_dev = (struct net_device *)seq->private;
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struct bat_priv *bat_priv = netdev_priv(net_dev);
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struct softif_neigh *softif_neigh;
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struct hlist_node *node;
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if (!bat_priv->primary_if) {
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return seq_printf(seq, "BATMAN mesh %s disabled - "
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"please specify interfaces to enable it\n",
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net_dev->name);
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}
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seq_printf(seq, "Softif neighbor list (%s)\n", net_dev->name);
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rcu_read_lock();
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hlist_for_each_entry_rcu(softif_neigh, node,
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&bat_priv->softif_neigh_list, list)
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seq_printf(seq, "%s %pM (vid: %d)\n",
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bat_priv->softif_neigh == softif_neigh
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? "=>" : " ", softif_neigh->addr,
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softif_neigh->vid);
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rcu_read_unlock();
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return 0;
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}
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static void softif_batman_recv(struct sk_buff *skb, struct net_device *dev,
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short vid)
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{
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struct bat_priv *bat_priv = netdev_priv(dev);
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struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
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struct batman_packet *batman_packet;
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struct softif_neigh *softif_neigh, *softif_neigh_tmp;
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if (ntohs(ethhdr->h_proto) == ETH_P_8021Q)
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batman_packet = (struct batman_packet *)
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(skb->data + ETH_HLEN + VLAN_HLEN);
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else
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batman_packet = (struct batman_packet *)(skb->data + ETH_HLEN);
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if (batman_packet->version != COMPAT_VERSION)
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goto err;
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if (batman_packet->packet_type != BAT_PACKET)
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goto err;
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if (!(batman_packet->flags & PRIMARIES_FIRST_HOP))
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goto err;
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if (is_my_mac(batman_packet->orig))
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goto err;
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softif_neigh = softif_neigh_get(bat_priv, batman_packet->orig, vid);
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if (!softif_neigh)
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goto err;
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if (bat_priv->softif_neigh == softif_neigh)
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goto out;
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/* we got a neighbor but its mac is 'bigger' than ours */
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if (memcmp(bat_priv->primary_if->net_dev->dev_addr,
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softif_neigh->addr, ETH_ALEN) < 0)
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goto out;
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/* switch to new 'smallest neighbor' */
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if ((bat_priv->softif_neigh) &&
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(memcmp(softif_neigh->addr, bat_priv->softif_neigh->addr,
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ETH_ALEN) < 0)) {
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bat_dbg(DBG_ROUTES, bat_priv,
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"Changing mesh exit point from %pM (vid: %d) "
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"to %pM (vid: %d).\n",
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bat_priv->softif_neigh->addr,
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bat_priv->softif_neigh->vid,
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softif_neigh->addr, softif_neigh->vid);
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softif_neigh_tmp = bat_priv->softif_neigh;
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bat_priv->softif_neigh = softif_neigh;
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softif_neigh_free_ref(softif_neigh_tmp);
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/* we need to hold the additional reference */
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goto err;
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}
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/* close own batX device and use softif_neigh as exit node */
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if ((!bat_priv->softif_neigh) &&
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(memcmp(softif_neigh->addr,
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bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN) < 0)) {
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bat_dbg(DBG_ROUTES, bat_priv,
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"Setting mesh exit point to %pM (vid: %d).\n",
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softif_neigh->addr, softif_neigh->vid);
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bat_priv->softif_neigh = softif_neigh;
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/* we need to hold the additional reference */
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goto err;
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}
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out:
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softif_neigh_free_ref(softif_neigh);
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err:
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kfree_skb(skb);
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return;
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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 *bat_priv = netdev_priv(dev);
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return &bat_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 bat_priv *bat_priv = netdev_priv(dev);
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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(&bat_priv->mesh_state) == MESH_ACTIVE) {
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hna_local_remove(bat_priv, dev->dev_addr,
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"mac address changed");
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hna_local_add(dev, 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(dev)))
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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 *soft_iface)
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{
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struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
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struct bat_priv *bat_priv = netdev_priv(soft_iface);
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struct bcast_packet *bcast_packet;
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struct vlan_ethhdr *vhdr;
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int data_len = skb->len, ret;
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short vid = -1;
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bool do_bcast = false;
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if (atomic_read(&bat_priv->mesh_state) != MESH_ACTIVE)
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goto dropped;
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soft_iface->trans_start = jiffies;
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switch (ntohs(ethhdr->h_proto)) {
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case ETH_P_8021Q:
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vhdr = (struct vlan_ethhdr *)skb->data;
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vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;
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if (ntohs(vhdr->h_vlan_encapsulated_proto) != ETH_P_BATMAN)
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break;
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/* fall through */
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case ETH_P_BATMAN:
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softif_batman_recv(skb, soft_iface, vid);
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goto end;
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}
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/**
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* if we have a another chosen mesh exit node in range
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* it will transport the packets to the mesh
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*/
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if ((bat_priv->softif_neigh) && (bat_priv->softif_neigh->vid == vid))
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goto dropped;
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/* TODO: check this for locks */
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hna_local_add(soft_iface, ethhdr->h_source);
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if (is_multicast_ether_addr(ethhdr->h_dest)) {
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ret = gw_is_target(bat_priv, skb);
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if (ret < 0)
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goto dropped;
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if (ret == 0)
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do_bcast = true;
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}
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/* ethernet packet should be broadcasted */
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if (do_bcast) {
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if (!bat_priv->primary_if)
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goto dropped;
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if (my_skb_head_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,
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bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
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/* set broadcast sequence number */
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bcast_packet->seqno =
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htonl(atomic_inc_return(&bat_priv->bcast_seqno));
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add_bcast_packet_to_list(bat_priv, skb);
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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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ret = unicast_send_skb(skb, bat_priv);
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if (ret != 0)
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goto dropped_freed;
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}
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bat_priv->stats.tx_packets++;
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bat_priv->stats.tx_bytes += data_len;
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goto end;
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dropped:
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kfree_skb(skb);
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dropped_freed:
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bat_priv->stats.tx_dropped++;
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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 net_device *soft_iface,
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struct sk_buff *skb, struct hard_iface *recv_if,
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int hdr_size)
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{
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struct bat_priv *bat_priv = netdev_priv(soft_iface);
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struct unicast_packet *unicast_packet;
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struct ethhdr *ethhdr;
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struct vlan_ethhdr *vhdr;
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short vid = -1;
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int ret;
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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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goto dropped;
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skb_pull_rcsum(skb, hdr_size);
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skb_reset_mac_header(skb);
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ethhdr = (struct ethhdr *)skb_mac_header(skb);
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switch (ntohs(ethhdr->h_proto)) {
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case ETH_P_8021Q:
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vhdr = (struct vlan_ethhdr *)skb->data;
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vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;
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if (ntohs(vhdr->h_vlan_encapsulated_proto) != ETH_P_BATMAN)
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break;
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/* fall through */
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case ETH_P_BATMAN:
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goto dropped;
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}
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/**
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* if we have a another chosen mesh exit node in range
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* it will transport the packets to the non-mesh network
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*/
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if ((bat_priv->softif_neigh) && (bat_priv->softif_neigh->vid == vid)) {
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skb_push(skb, hdr_size);
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unicast_packet = (struct unicast_packet *)skb->data;
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if ((unicast_packet->packet_type != BAT_UNICAST) &&
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(unicast_packet->packet_type != BAT_UNICAST_FRAG))
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goto dropped;
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skb_reset_mac_header(skb);
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memcpy(unicast_packet->dest,
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bat_priv->softif_neigh->addr, ETH_ALEN);
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ret = route_unicast_packet(skb, recv_if);
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if (ret == NET_RX_DROP)
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goto dropped;
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goto out;
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}
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/* skb->dev & skb->pkt_type are set here */
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if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
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goto dropped;
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skb->protocol = eth_type_trans(skb, soft_iface);
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/* should not be necessary 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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bat_priv->stats.rx_packets++;
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bat_priv->stats.rx_bytes += skb->len + sizeof(struct ethhdr);
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soft_iface->last_rx = jiffies;
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netif_rx(skb);
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return;
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dropped:
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|
kfree_skb(skb);
|
|
out:
|
|
return;
|
|
}
|
|
|
|
#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
|
|
|
|
static 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;
|
|
|
|
/**
|
|
* can't call min_mtu, because the needed variables
|
|
* have not been initialized yet
|
|
*/
|
|
dev->mtu = ETH_DATA_LEN;
|
|
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));
|
|
}
|
|
|
|
struct net_device *softif_create(char *name)
|
|
{
|
|
struct net_device *soft_iface;
|
|
struct bat_priv *bat_priv;
|
|
int ret;
|
|
|
|
soft_iface = alloc_netdev(sizeof(struct bat_priv) , name,
|
|
interface_setup);
|
|
|
|
if (!soft_iface) {
|
|
pr_err("Unable to allocate the batman interface: %s\n", name);
|
|
goto out;
|
|
}
|
|
|
|
ret = register_netdev(soft_iface);
|
|
if (ret < 0) {
|
|
pr_err("Unable to register the batman interface '%s': %i\n",
|
|
name, ret);
|
|
goto free_soft_iface;
|
|
}
|
|
|
|
bat_priv = netdev_priv(soft_iface);
|
|
|
|
atomic_set(&bat_priv->aggregated_ogms, 1);
|
|
atomic_set(&bat_priv->bonding, 0);
|
|
atomic_set(&bat_priv->vis_mode, VIS_TYPE_CLIENT_UPDATE);
|
|
atomic_set(&bat_priv->gw_mode, GW_MODE_OFF);
|
|
atomic_set(&bat_priv->gw_sel_class, 20);
|
|
atomic_set(&bat_priv->gw_bandwidth, 41);
|
|
atomic_set(&bat_priv->orig_interval, 1000);
|
|
atomic_set(&bat_priv->hop_penalty, 10);
|
|
atomic_set(&bat_priv->log_level, 0);
|
|
atomic_set(&bat_priv->fragmentation, 1);
|
|
atomic_set(&bat_priv->bcast_queue_left, BCAST_QUEUE_LEN);
|
|
atomic_set(&bat_priv->batman_queue_left, BATMAN_QUEUE_LEN);
|
|
|
|
atomic_set(&bat_priv->mesh_state, MESH_INACTIVE);
|
|
atomic_set(&bat_priv->bcast_seqno, 1);
|
|
atomic_set(&bat_priv->hna_local_changed, 0);
|
|
|
|
bat_priv->primary_if = NULL;
|
|
bat_priv->num_ifaces = 0;
|
|
bat_priv->softif_neigh = NULL;
|
|
|
|
ret = sysfs_add_meshif(soft_iface);
|
|
if (ret < 0)
|
|
goto unreg_soft_iface;
|
|
|
|
ret = debugfs_add_meshif(soft_iface);
|
|
if (ret < 0)
|
|
goto unreg_sysfs;
|
|
|
|
ret = mesh_init(soft_iface);
|
|
if (ret < 0)
|
|
goto unreg_debugfs;
|
|
|
|
return soft_iface;
|
|
|
|
unreg_debugfs:
|
|
debugfs_del_meshif(soft_iface);
|
|
unreg_sysfs:
|
|
sysfs_del_meshif(soft_iface);
|
|
unreg_soft_iface:
|
|
unregister_netdev(soft_iface);
|
|
return NULL;
|
|
|
|
free_soft_iface:
|
|
free_netdev(soft_iface);
|
|
out:
|
|
return NULL;
|
|
}
|
|
|
|
void softif_destroy(struct net_device *soft_iface)
|
|
{
|
|
debugfs_del_meshif(soft_iface);
|
|
sysfs_del_meshif(soft_iface);
|
|
mesh_free(soft_iface);
|
|
unregister_netdevice(soft_iface);
|
|
}
|
|
|
|
int softif_is_valid(struct net_device *net_dev)
|
|
{
|
|
#ifdef HAVE_NET_DEVICE_OPS
|
|
if (net_dev->netdev_ops->ndo_start_xmit == interface_tx)
|
|
return 1;
|
|
#else
|
|
if (net_dev->hard_start_xmit == interface_tx)
|
|
return 1;
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* 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;
|
|
}
|