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 --- batman-adv/icmp_socket.c | 58 +++++++++++++++++++++++++++++---------------- 1 files changed, 37 insertions(+), 21 deletions(-)
diff --git a/batman-adv/icmp_socket.c b/batman-adv/icmp_socket.c index 6a014a3..181e7f5 100644 --- a/batman-adv/icmp_socket.c +++ b/batman-adv/icmp_socket.c @@ -156,7 +156,8 @@ static ssize_t bat_socket_write(struct file *file, const char __user *buff, /* FIXME: each orig_node->batman_if will be attached to a softif */ struct bat_priv *bat_priv = netdev_priv(soft_device); struct socket_client *socket_client = file->private_data; - 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); @@ -173,40 +174,53 @@ 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)) + skb = dev_alloc_skb(packet_len + sizeof(struct ethhdr)); + if (!skb) return -EFAULT;
- 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 (!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) { + 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; @@ -225,21 +239,23 @@ 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, batman_if->net_dev->dev_addr, ETH_ALEN); + memcpy(icmp_packet->orig, batman_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; }