lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

Staging: batman-adv: Directly prepare icmp packets in socket buffer

Browse Source 
It is unnecessary to generate an icmp packet in an extra memory region
and than copying it to a new allocated skb.

This also resolved the problem that we do inform the user that we
couldn't send the packet because we couldn't allocate the socket buffer.

Signed-off-by: Sven Eckelmann <sven.eckelmann@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Sven Eckelmann
2010-09-05 01:58:26 +02:00
committed by Greg Kroah-Hartman
parent e63760e595
commit d52e90aeaf
1 changed files with 38 additions and 22 deletions
Download Patch File Download Diff File Expand all files Collapse all files

60
drivers/staging/batman-adv/icmp_socket.c
View File

@ -154,7 +154,8 @@ static ssize_t bat_socket_write(struct file *file, const char __user *buff,
{
struct socket_client *socket_client = file->private_data;
struct bat_priv *bat_priv = socket_client->bat_priv;
struct icmp_packet_rr icmp_packet;
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);
@ -174,40 +175,53 @@ static ssize_t bat_socket_write(struct file *file, const char __user *buff,
if (len >= sizeof(struct icmp_packet_rr))
packet_len = sizeof(struct icmp_packet_rr);
if (!access_ok(VERIFY_READ, buff, packet_len))
return -EFAULT;
skb = dev_alloc_skb(packet_len + sizeof(struct ethhdr));
if (!skb)
return -ENOMEM;
if (__copy_from_user(&icmp_packet, buff, packet_len))
return -EFAULT;
skb_reserve(skb, sizeof(struct ethhdr));
icmp_packet = (struct icmp_packet_rr *)skb_put(skb, packet_len);
if (icmp_packet.packet_type != BAT_ICMP) {
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");
return -EINVAL;
len = -EINVAL;
goto free_skb;
}
if (icmp_packet.msg_type != ECHO_REQUEST) {
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");
return -EINVAL;
len = -EINVAL;
goto free_skb;
}
icmp_packet.uid = socket_client->index;
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 out;
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(&module_state) != MODULE_ACTIVE)
goto dst_unreach;
spin_lock_irqsave(&orig_hash_lock, flags);
orig_node = ((struct orig_node *)hash_find(orig_hash, icmp_packet.dst));
orig_node = (struct orig_node *)hash_find(orig_hash, icmp_packet->dst);
if (!orig_node)
goto unlock;
@ -226,22 +240,24 @@ static ssize_t bat_socket_write(struct file *file, const char __user *buff,
if (batman_if->if_status != IF_ACTIVE)
goto dst_unreach;
memcpy(icmp_packet.orig,
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);
memcpy(icmp_packet->rr, batman_if->net_dev->dev_addr, ETH_ALEN);
send_raw_packet((unsigned char *)&icmp_packet,
packet_len, batman_if, dstaddr);
send_skb_packet(skb, batman_if, dstaddr);
goto out;
unlock:
spin_unlock_irqrestore(&orig_hash_lock, flags);
dst_unreach:
icmp_packet.msg_type = DESTINATION_UNREACHABLE;
bat_socket_add_packet(socket_client, &icmp_packet, packet_len);
icmp_packet->msg_type = DESTINATION_UNREACHABLE;
bat_socket_add_packet(socket_client, icmp_packet, packet_len);
free_skb:
kfree_skb(skb);
out:
return len;
}