1 files changed, 356 insertions, 0 deletions

diff --git a/net/batman-adv/icmp_socket.c b/net/batman-adv/icmp_socket.c
new file mode 100644
index 000000000000..ecf6d7ffab2e
--- /dev/null
+++ b/net/batman-adv/icmp_socket.c
@@ -0,0 +1,356 @@
+/*
+ * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors:
+ *
+ * Marek Lindner
+ *
+ * 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 <linux/debugfs.h>
+#include <linux/slab.h>
+#include "icmp_socket.h"
+#include "send.h"
+#include "types.h"
+#include "hash.h"
+#include "originator.h"
+#include "hard-interface.h"
+
+static struct socket_client *socket_client_hash[256];
+
+static void bat_socket_add_packet(struct socket_client *socket_client,
+                                  struct icmp_packet_rr *icmp_packet,
+                                  size_t icmp_len);
+
+void bat_socket_init(void)
+{
+        memset(socket_client_hash, 0, sizeof(socket_client_hash));
+}
+
+static int bat_socket_open(struct inode *inode, struct file *file)
+{
+        unsigned int i;
+        struct socket_client *socket_client;
+
+        nonseekable_open(inode, file);
+
+        socket_client = kmalloc(sizeof(struct socket_client), GFP_KERNEL);
+
+        if (!socket_client)
+                return -ENOMEM;
+
+        for (i = 0; i < ARRAY_SIZE(socket_client_hash); i++) {
+                if (!socket_client_hash[i]) {
+                        socket_client_hash[i] = socket_client;
+                        break;
+                }
+        }
+
+        if (i == ARRAY_SIZE(socket_client_hash)) {
+                pr_err("Error - can't add another packet client: "
+                       "maximum number of clients reached\n");
+                kfree(socket_client);
+                return -EXFULL;
+        }
+
+        INIT_LIST_HEAD(&socket_client->queue_list);
+        socket_client->queue_len = 0;
+        socket_client->index = i;
+        socket_client->bat_priv = inode->i_private;
+        spin_lock_init(&socket_client->lock);
+        init_waitqueue_head(&socket_client->queue_wait);
+
+        file->private_data = socket_client;
+
+        inc_module_count();
+        return 0;
+}
+
+static int bat_socket_release(struct inode *inode, struct file *file)
+{
+        struct socket_client *socket_client = file->private_data;
+        struct socket_packet *socket_packet;
+        struct list_head *list_pos, *list_pos_tmp;
+
+        spin_lock_bh(&socket_client->lock);
+
+        /* for all packets in the queue ... */
+        list_for_each_safe(list_pos, list_pos_tmp, &socket_client->queue_list) {
+                socket_packet = list_entry(list_pos,
+                                           struct socket_packet, list);
+
+                list_del(list_pos);
+                kfree(socket_packet);
+        }
+
+        socket_client_hash[socket_client->index] = NULL;
+        spin_unlock_bh(&socket_client->lock);
+
+        kfree(socket_client);
+        dec_module_count();
+
+        return 0;
+}
+
+static ssize_t bat_socket_read(struct file *file, char __user *buf,
+                               size_t count, loff_t *ppos)
+{
+        struct socket_client *socket_client = file->private_data;
+        struct socket_packet *socket_packet;
+        size_t packet_len;
+        int error;
+
+        if ((file->f_flags & O_NONBLOCK) && (socket_client->queue_len == 0))
+                return -EAGAIN;
+
+        if ((!buf) || (count < sizeof(struct icmp_packet)))
+                return -EINVAL;
+
+        if (!access_ok(VERIFY_WRITE, buf, count))
+                return -EFAULT;
+
+        error = wait_event_interruptible(socket_client->queue_wait,
+                                         socket_client->queue_len);
+
+        if (error)
+                return error;
+
+        spin_lock_bh(&socket_client->lock);
+
+        socket_packet = list_first_entry(&socket_client->queue_list,
+                                         struct socket_packet, list);
+        list_del(&socket_packet->list);
+        socket_client->queue_len--;
+
+        spin_unlock_bh(&socket_client->lock);
+
+        error = __copy_to_user(buf, &socket_packet->icmp_packet,
+                               socket_packet->icmp_len);
+
+        packet_len = socket_packet->icmp_len;
+        kfree(socket_packet);
+
+        if (error)
+                return -EFAULT;
+
+        return packet_len;
+}
+
+static ssize_t bat_socket_write(struct file *file, const char __user *buff,
+                                size_t len, loff_t *off)
+{
+        struct socket_client *socket_client = file->private_data;
+        struct bat_priv *bat_priv = socket_client->bat_priv;
+        struct sk_buff *skb;
+        struct icmp_packet_rr *icmp_packet;
+
+        struct orig_node *orig_node;
+        struct batman_if *batman_if;
+        size_t packet_len = sizeof(struct icmp_packet);
+        uint8_t dstaddr[ETH_ALEN];
+
+        if (len < sizeof(struct icmp_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 icmp_packet_rr))
+                packet_len = sizeof(struct icmp_packet_rr);
+
+        skb = dev_alloc_skb(packet_len + sizeof(struct ethhdr));
+        if (!skb)
+                return -ENOMEM;
+
+        skb_reserve(skb, sizeof(struct ethhdr));
+        icmp_packet = (struct icmp_packet_rr *)skb_put(skb, packet_len);
+
+        if (!access_ok(VERIFY_READ, buff, packet_len)) {
+                len = -EFAULT;
+                goto free_skb;
+        }
+
+        if (__copy_from_user(icmp_packet, buff, packet_len)) {
+                len = -EFAULT;
+                goto free_skb;
+        }
+
+        if (icmp_packet->packet_type != BAT_ICMP) {
+                bat_dbg(DBG_BATMAN, bat_priv,
+                        "Error - can't send packet from char device: "
+                        "got bogus packet type (expected: BAT_ICMP)\n");
+                len = -EINVAL;
+                goto free_skb;
+        }
+
+        if (icmp_packet->msg_type != ECHO_REQUEST) {
+                bat_dbg(DBG_BATMAN, bat_priv,
+                        "Error - can't send packet from char device: "
+                        "got bogus message type (expected: ECHO_REQUEST)\n");
+                len = -EINVAL;
+                goto free_skb;
+        }
+
+        icmp_packet->uid = socket_client->index;
+
+        if (icmp_packet->version != COMPAT_VERSION) {
+                icmp_packet->msg_type = PARAMETER_PROBLEM;
+                icmp_packet->ttl = COMPAT_VERSION;
+                bat_socket_add_packet(socket_client, icmp_packet, packet_len);
+                goto free_skb;
+        }
+
+        if (atomic_read(&bat_priv->mesh_state) != MESH_ACTIVE)
+                goto dst_unreach;
+
+        spin_lock_bh(&bat_priv->orig_hash_lock);
+        orig_node = ((struct orig_node *)hash_find(bat_priv->orig_hash,
+                                                   compare_orig, choose_orig,
+                                                   icmp_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_bh(&bat_priv->orig_hash_lock);
+
+        if (!batman_if)
+                goto dst_unreach;
+
+        if (batman_if->if_status != IF_ACTIVE)
+                goto dst_unreach;
+
+        memcpy(icmp_packet->orig,
+               bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
+
+        if (packet_len == sizeof(struct icmp_packet_rr))
+                memcpy(icmp_packet->rr, batman_if->net_dev->dev_addr, ETH_ALEN);
+
+
+        send_skb_packet(skb, batman_if, dstaddr);
+
+        goto out;
+
+unlock:
+        spin_unlock_bh(&bat_priv->orig_hash_lock);
+dst_unreach:
+        icmp_packet->msg_type = DESTINATION_UNREACHABLE;
+        bat_socket_add_packet(socket_client, icmp_packet, packet_len);
+free_skb:
+        kfree_skb(skb);
+out:
+        return len;
+}
+
+static unsigned int bat_socket_poll(struct file *file, poll_table *wait)
+{
+        struct socket_client *socket_client = file->private_data;
+
+        poll_wait(file, &socket_client->queue_wait, wait);
+
+        if (socket_client->queue_len > 0)
+                return POLLIN | POLLRDNORM;
+
+        return 0;
+}
+
+static const struct file_operations fops = {
+        .owner = THIS_MODULE,
+        .open = bat_socket_open,
+        .release = bat_socket_release,
+        .read = bat_socket_read,
+        .write = bat_socket_write,
+        .poll = bat_socket_poll,
+        .llseek = no_llseek,
+};
+
+int bat_socket_setup(struct bat_priv *bat_priv)
+{
+        struct dentry *d;
+
+        if (!bat_priv->debug_dir)
+                goto err;
+
+        d = debugfs_create_file(ICMP_SOCKET, S_IFREG | S_IWUSR | S_IRUSR,
+                                bat_priv->debug_dir, bat_priv, &fops);
+        if (d)
+                goto err;
+
+        return 0;
+
+err:
+        return 1;
+}
+
+static void bat_socket_add_packet(struct socket_client *socket_client,
+                                  struct icmp_packet_rr *icmp_packet,
+                                  size_t icmp_len)
+{
+        struct socket_packet *socket_packet;
+
+        socket_packet = kmalloc(sizeof(struct socket_packet), GFP_ATOMIC);
+
+        if (!socket_packet)
+                return;
+
+        INIT_LIST_HEAD(&socket_packet->list);
+        memcpy(&socket_packet->icmp_packet, icmp_packet, icmp_len);
+        socket_packet->icmp_len = icmp_len;
+
+        spin_lock_bh(&socket_client->lock);
+
+        /* while waiting for the lock the socket_client could have been
+         * deleted */
+        if (!socket_client_hash[icmp_packet->uid]) {
+                spin_unlock_bh(&socket_client->lock);
+                kfree(socket_packet);
+                return;
+        }
+
+        list_add_tail(&socket_packet->list, &socket_client->queue_list);
+        socket_client->queue_len++;
+
+        if (socket_client->queue_len > 100) {
+                socket_packet = list_first_entry(&socket_client->queue_list,
+                                                 struct socket_packet, list);
+
+                list_del(&socket_packet->list);
+                kfree(socket_packet);
+                socket_client->queue_len--;
+        }
+
+        spin_unlock_bh(&socket_client->lock);
+
+        wake_up(&socket_client->queue_wait);
+}
+
+void bat_socket_receive_packet(struct icmp_packet_rr *icmp_packet,
+                               size_t icmp_len)
+{
+        struct socket_client *hash = socket_client_hash[icmp_packet->uid];
+
+        if (hash)
+                bat_socket_add_packet(hash, icmp_packet, icmp_len);
+}