bat_auth.c
#include "main.h"
#include <linux/debugfs.h>
#include <linux/slab.h>
#include "bat_auth.h"
#include "send.h"
#include "types.h"
#include "hash.h"
#include "hard-interface.h"

#include "compat.h"

static int bat_auth_open(struct inode *inode, struct file *file)
{

    return 0;
}

static int bat_auth_release(struct inode *inode, struct file *file)
{
    kfree(bat_socket_packet);
    return 0;
}

static ssize_t bat_auth_read(struct file *file, char __user *buf,
                   size_t count, loff_t *ppos)
{
    struct bat_socket_packet *bat_socket_packet;
    size_t packet_len;
    int error;

    if ((!buf) || (count < sizeof(struct bat_auth_packet)))
        return -EINVAL;

    if (!access_ok(VERIFY_WRITE, buf, count))
        return -EFAULT;

    if (nounce_received)
    {
        error = __copy_to_user(buf, &ogm_packet->batman_packet,
                   ogm_packet->ogm_len);
        bat_dbg(DBG_BATMAN, bat_priv,
            "batman packet sent to user\n");
    }

    error = __copy_to_user(buf, &bat_socket_packet->auth_packet,
                   bat_socket_packet->auth_len);
    bat_dbg(DBG_BATMAN, bat_priv,
            "batman authentication sent to user\n");

    packet_len = bat_socket_packet->auth_len;
    kfree(bat_socket_packet);

    if (error)
        return -EFAULT;

    return packet_len;
}

static ssize_t bat_auth_write(struct file *file, const char __user *buff,
                size_t len, loff_t *off)
{

    struct bat_priv *bat_priv;
    struct bat_auth_packet auth_packet;
    struct orig_node *orig_node;
    struct batman_if *batman_if;
    size_t packet_len = sizeof(struct bat_auth_packet);
    uint8_t dstaddr[ETH_ALEN];
    unsigned long flags;

    if (len < sizeof(struct bat_auth_packet)) {
        bat_dbg(DBG_BATMAN, bat_priv,
            "Error - can't send packet from char device: "
            "invalid packet size\n");
        return -EINVAL;
    }

    if (!bat_priv->primary_if)
        return -EFAULT;

    if (len >= sizeof(struct bat_auth_packet))
        packet_len = sizeof(struct bat_auth_packet);

    if (!access_ok(VERIFY_READ, buff, packet_len))
        return -EFAULT;

    if (__copy_from_user(&auth_packet, buff, packet_len))
        return -EFAULT;

    if (bat_auth_packet.packet_type != BAT_AUTH) {
        bat_dbg(DBG_BATMAN, bat_priv,
            "Error - can't send packet from char device: "
            "got bogus packet type (expected: BAT_AUTH)\n");
        return -EINVAL;
    }

    if (bat_auth_packet.version != COMPAT_VERSION) {
        bat_auth_packet.ttl = COMPAT_VERSION;
        goto out;
    }

    if (atomic_read(&module_state) != MODULE_ACTIVE)
        goto dst_unreach;

    spin_lock_irqsave(&orig_hash_lock, flags);
    orig_node = ((struct orig_node *)hash_find(orig_hash, bat_auth_packet.dst));

    if (!orig_node)
        goto unlock;

    if (!orig_node->router)
        goto unlock;

    batman_if = orig_node->router->if_incoming;
    memcpy(dstaddr, orig_node->router->addr, ETH_ALEN);

    spin_unlock_irqrestore(&orig_hash_lock, flags);

    if (!batman_if)
        goto dst_unreach;

    if (batman_if->if_status != IF_ACTIVE)
        goto dst_unreach;

    memcpy(bat_auth_packet.orig,
           bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);

    if (packet_len == sizeof(struct bat_auth_packet))
        memcpy(bat_auth_packet, batman_if->net_dev->dev_addr, ETH_ALEN);

    send_raw_packet((unsigned char *)&bat_auth_packet,
            packet_len, batman_if, dstaddr);

    goto out;

unlock:
    spin_unlock_irqrestore(&orig_hash_lock, flags);
dst_unreach:
    bat_dbg(DBG_BATMAN, bat_priv,
            "Error - destination unreachable: \n");
out:
    return len;
}


static const struct file_operations auth_fops = {
    .owner = THIS_MODULE,
    .open = bat_auth_open,
    .release = bat_auth_release,
    .read = bat_auth_read,
    .write = bat_auth_write,

};

int bat_auth_setup(struct bat_priv *bat_priv)
{
    struct dentry *d;

    if (!bat_priv->debug_dir)
        goto err;

    d = debugfs_create_file(BATMAN_AUTH, S_IFREG | S_IWUSR | S_IRUSR,
                bat_priv->debug_dir, bat_priv, &auth_fops);
    if (d)
        goto err;

    return 0;

err:
    return 1;
}

types.h

/*
 * 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
 *
 */



#ifndef _NET_BATMAN_ADV_TYPES_H_
#define _NET_BATMAN_ADV_TYPES_H_

#include "packet.h"
#include "bitarray.h"

#define BAT_HEADER_LEN (sizeof(struct ethhdr) + \
    ((sizeof(struct unicast_packet) > sizeof(struct bcast_packet) ? \
     sizeof(struct unicast_packet) : \
     sizeof(struct bcast_packet))))

static bool nounce_received;


struct batman_if {
    struct list_head list;
    int16_t if_num;
    char *dev;
    char if_status;
    char addr_str[ETH_STR_LEN];
    struct net_device *net_dev;
    atomic_t seqno;
    unsigned char *packet_buff;
    int packet_len;
    struct kobject *hardif_obj;
    struct rcu_head rcu;

};

/**
  * orig_node - structure for orig_list maintaining nodes of mesh
  * @primary_addr: hosts primary interface address
  * @last_valid: when last packet from this node was received
  * @bcast_seqno_reset: time when the broadcast seqno window was reset
  * @batman_seqno_reset: time when the batman seqno window was reset
  * @flags: for now only VIS_SERVER flag
  * @last_real_seqno: last and best known squence number
  * @last_ttl: ttl of last received packet
  * @last_bcast_seqno: last broadcast sequence number received by this host
  *
  * @candidates: how many candidates are available
  * @selected: next bonding candidate
 */
struct orig_node {
    uint8_t orig[ETH_ALEN];
    uint8_t primary_addr[ETH_ALEN];
    struct neigh_node *router;
    TYPE_OF_WORD *bcast_own;
    uint8_t *bcast_own_sum;
    uint8_t tq_own;
    int tq_asym_penalty;
    unsigned long last_valid;
    unsigned long bcast_seqno_reset;
    unsigned long batman_seqno_reset;
    uint8_t  flags;
    unsigned char *hna_buff;
    int16_t hna_buff_len;
    uint32_t last_real_seqno;
    uint8_t last_ttl;
    TYPE_OF_WORD bcast_bits[NUM_WORDS];
    uint32_t last_bcast_seqno;
    struct list_head neigh_list;
    struct {
        uint8_t candidates;
        struct neigh_node *selected;
    } bond;
};

/**
  * neigh_node
  * @last_valid: when last packet via this neighbor was received
 */
struct neigh_node {
    struct list_head list;
    uint8_t addr[ETH_ALEN];
    uint8_t real_packet_count;
    uint8_t tq_recv[TQ_GLOBAL_WINDOW_SIZE];
    uint8_t tq_index;
    uint8_t tq_avg;
    uint8_t last_ttl;
    struct neigh_node *next_bond_candidate;
    unsigned long last_valid;
    TYPE_OF_WORD real_bits[NUM_WORDS];
    struct orig_node *orig_node;
    struct batman_if *if_incoming;
};

struct bat_priv {
    struct net_device_stats stats;
    atomic_t aggregation_enabled;
    atomic_t bonding_enabled;
    atomic_t vis_mode;
    atomic_t orig_interval;
    atomic_t log_level;
    char num_ifaces;
    struct debug_log *debug_log;
    struct batman_if *primary_if;
    struct kobject *mesh_obj;
    struct dentry *debug_dir;
};

struct socket_client {
    struct list_head queue_list;
    unsigned int queue_len;
    unsigned char index;
    spinlock_t lock;
    wait_queue_head_t queue_wait;
    struct bat_priv *bat_priv;
};

struct socket_packet {
    struct list_head list;
    size_t icmp_len;
    struct icmp_packet_rr icmp_packet;
};

/*Batman authentication packet*/

struct bat_socket_packet {
    struct list_head list;
    size_t auth_len;
    struct bat_auth_packet auth_packet;
};

struct hna_local_entry {
    uint8_t addr[ETH_ALEN];
    unsigned long last_seen;
    char never_purge;
};

struct hna_global_entry {
    uint8_t addr[ETH_ALEN];
    struct orig_node *orig_node;
};

/**
  * forw_packet - structure for forw_list maintaining packets to be
  *               send/forwarded
 */
struct forw_packet {
    struct hlist_node list;
    unsigned long send_time;
    uint8_t own;
    struct sk_buff *skb;
    unsigned char *packet_buff;
    uint16_t packet_len;
    uint32_t direct_link_flags;
    uint8_t num_packets;
    struct delayed_work delayed_work;
    struct batman_if *if_incoming;
};

/* While scanning for vis-entries of a particular vis-originator
 * this list collects its interfaces to create a subgraph/cluster
 * out of them later
 */
struct if_list_entry {
    uint8_t addr[ETH_ALEN];
    bool primary;
    struct hlist_node list;
};

struct debug_log {
    char log_buff[LOG_BUF_LEN];
    unsigned long log_start;
    unsigned long log_end;
    spinlock_t lock;
    wait_queue_head_t queue_wait;
};

struct ogm_packet {
    struct list_head list;
    size_t ogm_len;
    struct batman_packet batman_packet;
};
#endif /* _NET_BATMAN_ADV_TYPES_H_ */


compilation error
/home/priya/batman-adv-2010.1.0/bat_auth.c: In function 'bat_auth_release':
/home/priya/batman-adv-2010.1.0/bat_auth.c:20: error: 'bat_socket_packet' undeclared (first use in this function)
/home/priya/batman-adv-2010.1.0/bat_auth.c:20: error: (Each undeclared identifier is reported only once
/home/priya/batman-adv-2010.1.0/bat_auth.c:20: error: for each function it appears in.)
/home/priya/batman-adv-2010.1.0/bat_auth.c: In function 'bat_auth_read':
/home/priya/batman-adv-2010.1.0/bat_auth.c:39: error: 'ogm_packet' undeclared (first use in this function)
/home/priya/batman-adv-2010.1.0/bat_auth.c:41: error: 'bat_priv' undeclared (first use in this function)
/home/priya/batman-adv-2010.1.0/bat_auth.c: In function 'bat_auth_write':
/home/priya/batman-adv-2010.1.0/bat_auth.c:67: error: invalid application of 'sizeof' to incomplete type 'struct auth_packet'
/home/priya/batman-adv-2010.1.0/bat_auth.c:90: error: 'bat_auth_packet' undeclared (first use in this function)