| /* |
| * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors: |
| * |
| * Marek Lindner, Simon Wunderlich |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of version 2 of the GNU General Public |
| * License as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, but |
| * WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| * 02110-1301, USA |
| * |
| */ |
| |
| #include "main.h" |
| #include "soft-interface.h" |
| #include "hard-interface.h" |
| #include "send.h" |
| #include "translation-table.h" |
| #include "types.h" |
| #include "hash.h" |
| #include <linux/slab.h> |
| #include <linux/ethtool.h> |
| #include <linux/etherdevice.h> |
| |
| static uint16_t bcast_seqno = 1; /* give own bcast messages seq numbers to avoid |
| * broadcast storms */ |
| static int32_t skb_packets; |
| static int32_t skb_bad_packets; |
| |
| unsigned char mainIfAddr[ETH_ALEN]; |
| static unsigned char mainIfAddr_default[ETH_ALEN]; |
| static int bat_get_settings(struct net_device *dev, struct ethtool_cmd *cmd); |
| static void bat_get_drvinfo(struct net_device *dev, |
| struct ethtool_drvinfo *info); |
| static u32 bat_get_msglevel(struct net_device *dev); |
| static void bat_set_msglevel(struct net_device *dev, u32 value); |
| static u32 bat_get_link(struct net_device *dev); |
| static u32 bat_get_rx_csum(struct net_device *dev); |
| static int bat_set_rx_csum(struct net_device *dev, u32 data); |
| |
| static const struct ethtool_ops bat_ethtool_ops = { |
| .get_settings = bat_get_settings, |
| .get_drvinfo = bat_get_drvinfo, |
| .get_msglevel = bat_get_msglevel, |
| .set_msglevel = bat_set_msglevel, |
| .get_link = bat_get_link, |
| .get_rx_csum = bat_get_rx_csum, |
| .set_rx_csum = bat_set_rx_csum |
| }; |
| |
| void set_main_if_addr(uint8_t *addr) |
| { |
| memcpy(mainIfAddr, addr, ETH_ALEN); |
| } |
| |
| int main_if_was_up(void) |
| { |
| return (memcmp(mainIfAddr, mainIfAddr_default, ETH_ALEN) != 0 ? 1 : 0); |
| } |
| |
| int my_skb_push(struct sk_buff *skb, unsigned int len) |
| { |
| int result = 0; |
| |
| skb_packets++; |
| if (skb_headroom(skb) < len) { |
| skb_bad_packets++; |
| result = pskb_expand_head(skb, len, 0, GFP_ATOMIC); |
| |
| if (result < 0) |
| return result; |
| } |
| |
| skb_push(skb, len); |
| return 0; |
| } |
| |
| #ifdef HAVE_NET_DEVICE_OPS |
| static const struct net_device_ops bat_netdev_ops = { |
| .ndo_open = interface_open, |
| .ndo_stop = interface_release, |
| .ndo_get_stats = interface_stats, |
| .ndo_set_mac_address = interface_set_mac_addr, |
| .ndo_change_mtu = interface_change_mtu, |
| .ndo_start_xmit = interface_tx, |
| .ndo_validate_addr = eth_validate_addr |
| }; |
| #endif |
| |
| void interface_setup(struct net_device *dev) |
| { |
| struct bat_priv *priv = netdev_priv(dev); |
| char dev_addr[ETH_ALEN]; |
| |
| ether_setup(dev); |
| |
| #ifdef HAVE_NET_DEVICE_OPS |
| dev->netdev_ops = &bat_netdev_ops; |
| #else |
| dev->open = interface_open; |
| dev->stop = interface_release; |
| dev->get_stats = interface_stats; |
| dev->set_mac_address = interface_set_mac_addr; |
| dev->change_mtu = interface_change_mtu; |
| dev->hard_start_xmit = interface_tx; |
| #endif |
| dev->destructor = free_netdev; |
| |
| dev->mtu = hardif_min_mtu(); |
| dev->hard_header_len = BAT_HEADER_LEN; /* reserve more space in the |
| * skbuff for our header */ |
| |
| /* generate random address */ |
| random_ether_addr(dev_addr); |
| memcpy(dev->dev_addr, dev_addr, ETH_ALEN); |
| |
| SET_ETHTOOL_OPS(dev, &bat_ethtool_ops); |
| |
| memset(priv, 0, sizeof(struct bat_priv)); |
| } |
| |
| int interface_open(struct net_device *dev) |
| { |
| netif_start_queue(dev); |
| return 0; |
| } |
| |
| int interface_release(struct net_device *dev) |
| { |
| netif_stop_queue(dev); |
| return 0; |
| } |
| |
| struct net_device_stats *interface_stats(struct net_device *dev) |
| { |
| struct bat_priv *priv = netdev_priv(dev); |
| return &priv->stats; |
| } |
| |
| int interface_set_mac_addr(struct net_device *dev, void *p) |
| { |
| struct sockaddr *addr = p; |
| |
| if (!is_valid_ether_addr(addr->sa_data)) |
| return -EADDRNOTAVAIL; |
| |
| /* only modify hna-table if it has been initialised before */ |
| if (atomic_read(&module_state) == MODULE_ACTIVE) { |
| hna_local_remove(dev->dev_addr, "mac address changed"); |
| hna_local_add(addr->sa_data); |
| } |
| |
| memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN); |
| |
| return 0; |
| } |
| |
| int interface_change_mtu(struct net_device *dev, int new_mtu) |
| { |
| /* check ranges */ |
| if ((new_mtu < 68) || (new_mtu > hardif_min_mtu())) |
| return -EINVAL; |
| |
| dev->mtu = new_mtu; |
| |
| return 0; |
| } |
| |
| int interface_tx(struct sk_buff *skb, struct net_device *dev) |
| { |
| struct unicast_packet *unicast_packet; |
| struct bcast_packet *bcast_packet; |
| struct orig_node *orig_node; |
| struct ethhdr *ethhdr = (struct ethhdr *)skb->data; |
| struct bat_priv *priv = netdev_priv(dev); |
| struct batman_if *batman_if; |
| struct bat_priv *bat_priv; |
| uint8_t dstaddr[6]; |
| int data_len = skb->len; |
| unsigned long flags; |
| |
| if (atomic_read(&module_state) != MODULE_ACTIVE) |
| goto dropped; |
| |
| /* FIXME: each batman_if will be attached to a softif */ |
| bat_priv = netdev_priv(soft_device); |
| |
| dev->trans_start = jiffies; |
| /* TODO: check this for locks */ |
| hna_local_add(ethhdr->h_source); |
| |
| /* ethernet packet should be broadcasted */ |
| if (is_bcast(ethhdr->h_dest) || is_mcast(ethhdr->h_dest)) { |
| |
| if (my_skb_push(skb, sizeof(struct bcast_packet)) < 0) |
| goto dropped; |
| |
| bcast_packet = (struct bcast_packet *)skb->data; |
| bcast_packet->version = COMPAT_VERSION; |
| |
| /* batman packet type: broadcast */ |
| bcast_packet->packet_type = BAT_BCAST; |
| |
| /* hw address of first interface is the orig mac because only |
| * this mac is known throughout the mesh */ |
| memcpy(bcast_packet->orig, mainIfAddr, ETH_ALEN); |
| |
| /* set broadcast sequence number */ |
| bcast_packet->seqno = htons(bcast_seqno); |
| |
| /* broadcast packet. on success, increase seqno. */ |
| if (add_bcast_packet_to_list(skb) == NETDEV_TX_OK) |
| bcast_seqno++; |
| |
| /* a copy is stored in the bcast list, therefore removing |
| * the original skb. */ |
| kfree_skb(skb); |
| |
| /* unicast packet */ |
| } else { |
| spin_lock_irqsave(&orig_hash_lock, flags); |
| /* get routing information */ |
| orig_node = ((struct orig_node *)hash_find(orig_hash, |
| ethhdr->h_dest)); |
| |
| /* check for hna host */ |
| if (!orig_node) |
| orig_node = transtable_search(ethhdr->h_dest); |
| |
| if ((orig_node) && |
| (orig_node->router)) { |
| struct neigh_node *router = orig_node->router; |
| |
| if (my_skb_push(skb, sizeof(struct unicast_packet)) < 0) |
| goto unlock; |
| |
| unicast_packet = (struct unicast_packet *)skb->data; |
| |
| unicast_packet->version = COMPAT_VERSION; |
| /* batman packet type: unicast */ |
| unicast_packet->packet_type = BAT_UNICAST; |
| /* set unicast ttl */ |
| unicast_packet->ttl = TTL; |
| /* copy the destination for faster routing */ |
| memcpy(unicast_packet->dest, orig_node->orig, ETH_ALEN); |
| |
| /* net_dev won't be available when not active */ |
| if (router->if_incoming->if_status != IF_ACTIVE) |
| goto unlock; |
| |
| /* don't lock while sending the packets ... we therefore |
| * copy the required data before sending */ |
| |
| batman_if = router->if_incoming; |
| memcpy(dstaddr, router->addr, ETH_ALEN); |
| spin_unlock_irqrestore(&orig_hash_lock, flags); |
| |
| send_skb_packet(skb, batman_if, dstaddr); |
| } else { |
| goto unlock; |
| } |
| } |
| |
| priv->stats.tx_packets++; |
| priv->stats.tx_bytes += data_len; |
| goto end; |
| |
| unlock: |
| spin_unlock_irqrestore(&orig_hash_lock, flags); |
| dropped: |
| priv->stats.tx_dropped++; |
| kfree_skb(skb); |
| end: |
| return NETDEV_TX_OK; |
| } |
| |
| void interface_rx(struct sk_buff *skb, int hdr_size) |
| { |
| struct net_device *dev = soft_device; |
| struct bat_priv *priv = netdev_priv(dev); |
| |
| /* check if enough space is available for pulling, and pull */ |
| if (!pskb_may_pull(skb, hdr_size)) { |
| kfree_skb(skb); |
| return; |
| } |
| skb_pull_rcsum(skb, hdr_size); |
| /* skb_set_mac_header(skb, -sizeof(struct ethhdr));*/ |
| |
| if (unlikely(!pskb_may_pull(skb, ETH_HLEN))) { |
| kfree_skb(skb); |
| return; |
| } |
| skb->dev = dev; |
| skb->protocol = eth_type_trans(skb, dev); |
| |
| /* should not be neccesary anymore as we use skb_pull_rcsum() |
| * TODO: please verify this and remove this TODO |
| * -- Dec 21st 2009, Simon Wunderlich */ |
| |
| /* skb->ip_summed = CHECKSUM_UNNECESSARY;*/ |
| |
| /* TODO: set skb->pkt_type to PACKET_BROADCAST, PACKET_MULTICAST, |
| * PACKET_OTHERHOST or PACKET_HOST */ |
| |
| priv->stats.rx_packets++; |
| priv->stats.rx_bytes += skb->len; |
| |
| dev->last_rx = jiffies; |
| |
| netif_rx(skb); |
| } |
| |
| /* ethtool */ |
| static int bat_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) |
| { |
| cmd->supported = 0; |
| cmd->advertising = 0; |
| cmd->speed = SPEED_10; |
| cmd->duplex = DUPLEX_FULL; |
| cmd->port = PORT_TP; |
| cmd->phy_address = 0; |
| cmd->transceiver = XCVR_INTERNAL; |
| cmd->autoneg = AUTONEG_DISABLE; |
| cmd->maxtxpkt = 0; |
| cmd->maxrxpkt = 0; |
| |
| return 0; |
| } |
| |
| static void bat_get_drvinfo(struct net_device *dev, |
| struct ethtool_drvinfo *info) |
| { |
| strcpy(info->driver, "B.A.T.M.A.N. advanced"); |
| strcpy(info->version, SOURCE_VERSION); |
| strcpy(info->fw_version, "N/A"); |
| strcpy(info->bus_info, "batman"); |
| } |
| |
| static u32 bat_get_msglevel(struct net_device *dev) |
| { |
| return -EOPNOTSUPP; |
| } |
| |
| static void bat_set_msglevel(struct net_device *dev, u32 value) |
| { |
| } |
| |
| static u32 bat_get_link(struct net_device *dev) |
| { |
| return 1; |
| } |
| |
| static u32 bat_get_rx_csum(struct net_device *dev) |
| { |
| return 0; |
| } |
| |
| static int bat_set_rx_csum(struct net_device *dev, u32 data) |
| { |
| return -EOPNOTSUPP; |
| } |