![Antonio Quartulli](/assets/img/avatar_default.png)
Instead of using sizeof(struct ethhdr) it is strongly recommended to use the kernel macro ETH_HLEN. This patch substitute each occurrence of the former expressione with the latter one. Signed-off-by: Antonio Quartulli <ordex@autistici.org>
489 lines
12 KiB
C
489 lines
12 KiB
C
/*
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* Copyright (C) 2007-2012 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 "originator.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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#include "bridge_loop_avoidance.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 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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};
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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 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 transtable if it has been initialized before */
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if (atomic_read(&bat_priv->mesh_state) == MESH_ACTIVE) {
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tt_local_remove(bat_priv, dev->dev_addr,
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"mac address changed", false);
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tt_local_add(dev, addr->sa_data, NULL_IFINDEX);
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}
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memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
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dev->addr_assign_type &= ~NET_ADDR_RANDOM;
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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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static 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 hard_iface *primary_if = NULL;
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struct bcast_packet *bcast_packet;
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struct vlan_ethhdr *vhdr;
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static const uint8_t stp_addr[ETH_ALEN] = {0x01, 0x80, 0xC2, 0x00, 0x00,
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0x00};
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unsigned int header_len = 0;
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int data_len = skb->len, ret;
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short vid __maybe_unused = -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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goto dropped;
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}
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if (bla_tx(bat_priv, skb, vid))
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goto dropped;
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/* Register the client MAC in the transtable */
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tt_local_add(soft_iface, ethhdr->h_source, skb->skb_iif);
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/* don't accept stp packets. STP does not help in meshes.
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* better use the bridge loop avoidance ...
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*/
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if (compare_eth(ethhdr->h_dest, stp_addr))
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goto dropped;
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if (is_multicast_ether_addr(ethhdr->h_dest)) {
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do_bcast = true;
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switch (atomic_read(&bat_priv->gw_mode)) {
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case GW_MODE_SERVER:
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/* gateway servers should not send dhcp
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* requests into the mesh */
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ret = gw_is_dhcp_target(skb, &header_len);
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if (ret)
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goto dropped;
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break;
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case GW_MODE_CLIENT:
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/* gateway clients should send dhcp requests
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* via unicast to their gateway */
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ret = gw_is_dhcp_target(skb, &header_len);
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if (ret)
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do_bcast = false;
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break;
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case GW_MODE_OFF:
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default:
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break;
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}
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}
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/* ethernet packet should be broadcasted */
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if (do_bcast) {
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primary_if = primary_if_get_selected(bat_priv);
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if (!primary_if)
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goto dropped;
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if (my_skb_head_push(skb, sizeof(*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->header.version = COMPAT_VERSION;
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bcast_packet->header.ttl = TTL;
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/* batman packet type: broadcast */
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bcast_packet->header.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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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, 1);
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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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if (atomic_read(&bat_priv->gw_mode) != GW_MODE_OFF) {
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ret = gw_out_of_range(bat_priv, skb, ethhdr);
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if (ret)
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goto dropped;
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}
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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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if (primary_if)
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hardif_free_ref(primary_if);
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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 ethhdr *ethhdr;
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struct vlan_ethhdr *vhdr;
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short vid __maybe_unused = -1;
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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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/* 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 + ETH_HLEN;
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soft_iface->last_rx = jiffies;
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if (is_ap_isolated(bat_priv, ethhdr->h_source, ethhdr->h_dest))
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goto dropped;
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/* Let the bridge loop avoidance check the packet. If will
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* not handle it, we can safely push it up.
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*/
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if (bla_rx(bat_priv, skb, vid))
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goto out;
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netif_rx(skb);
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goto out;
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dropped:
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kfree_skb(skb);
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out:
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return;
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}
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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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static 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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ether_setup(dev);
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dev->netdev_ops = &bat_netdev_ops;
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dev->destructor = free_netdev;
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dev->tx_queue_len = 0;
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/**
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* can't call min_mtu, because the needed variables
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* have not been initialized yet
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*/
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dev->mtu = ETH_DATA_LEN;
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/* reserve more space in the skbuff for our header */
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dev->hard_header_len = BAT_HEADER_LEN;
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/* generate random address */
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eth_hw_addr_random(dev);
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SET_ETHTOOL_OPS(dev, &bat_ethtool_ops);
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memset(priv, 0, sizeof(*priv));
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}
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struct net_device *softif_create(const char *name)
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{
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struct net_device *soft_iface;
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struct bat_priv *bat_priv;
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int ret;
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soft_iface = alloc_netdev(sizeof(*bat_priv), name, interface_setup);
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if (!soft_iface)
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goto out;
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ret = register_netdevice(soft_iface);
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if (ret < 0) {
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pr_err("Unable to register the batman interface '%s': %i\n",
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name, ret);
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goto free_soft_iface;
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}
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bat_priv = netdev_priv(soft_iface);
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atomic_set(&bat_priv->aggregated_ogms, 1);
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atomic_set(&bat_priv->bonding, 0);
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atomic_set(&bat_priv->bridge_loop_avoidance, 0);
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atomic_set(&bat_priv->ap_isolation, 0);
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atomic_set(&bat_priv->vis_mode, VIS_TYPE_CLIENT_UPDATE);
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atomic_set(&bat_priv->gw_mode, GW_MODE_OFF);
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atomic_set(&bat_priv->gw_sel_class, 20);
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atomic_set(&bat_priv->gw_bandwidth, 41);
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atomic_set(&bat_priv->orig_interval, 1000);
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atomic_set(&bat_priv->hop_penalty, 30);
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atomic_set(&bat_priv->log_level, 0);
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atomic_set(&bat_priv->fragmentation, 1);
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atomic_set(&bat_priv->bcast_queue_left, BCAST_QUEUE_LEN);
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atomic_set(&bat_priv->batman_queue_left, BATMAN_QUEUE_LEN);
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atomic_set(&bat_priv->mesh_state, MESH_INACTIVE);
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atomic_set(&bat_priv->bcast_seqno, 1);
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atomic_set(&bat_priv->ttvn, 0);
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atomic_set(&bat_priv->tt_local_changes, 0);
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atomic_set(&bat_priv->tt_ogm_append_cnt, 0);
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atomic_set(&bat_priv->bla_num_requests, 0);
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bat_priv->tt_buff = NULL;
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bat_priv->tt_buff_len = 0;
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bat_priv->tt_poss_change = false;
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bat_priv->primary_if = NULL;
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bat_priv->num_ifaces = 0;
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ret = bat_algo_select(bat_priv, bat_routing_algo);
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if (ret < 0)
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goto unreg_soft_iface;
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ret = sysfs_add_meshif(soft_iface);
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if (ret < 0)
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goto unreg_soft_iface;
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ret = debugfs_add_meshif(soft_iface);
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if (ret < 0)
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goto unreg_sysfs;
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ret = mesh_init(soft_iface);
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if (ret < 0)
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goto unreg_debugfs;
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return soft_iface;
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unreg_debugfs:
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debugfs_del_meshif(soft_iface);
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unreg_sysfs:
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sysfs_del_meshif(soft_iface);
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unreg_soft_iface:
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unregister_netdevice(soft_iface);
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return NULL;
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free_soft_iface:
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free_netdev(soft_iface);
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out:
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return NULL;
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}
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void softif_destroy(struct net_device *soft_iface)
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{
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debugfs_del_meshif(soft_iface);
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sysfs_del_meshif(soft_iface);
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mesh_free(soft_iface);
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unregister_netdevice(soft_iface);
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}
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int softif_is_valid(const struct net_device *net_dev)
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{
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if (net_dev->netdev_ops->ndo_start_xmit == interface_tx)
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return 1;
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return 0;
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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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ethtool_cmd_speed_set(cmd, 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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