From patchwork Sat Sep 4 23:58:26 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sven Eckelmann X-Patchwork-Id: 362 Return-Path: Received: from mail.gmx.net (mailout-de.gmx.net [213.165.64.23]) by open-mesh.net (Postfix) with SMTP id 40475154584 for ; Sun, 5 Sep 2010 01:58:55 +0200 (CEST) Received: (qmail invoked by alias); 04 Sep 2010 23:58:54 -0000 Received: from i59F6A2A6.versanet.de (EHLO sven-desktop.lazhur.ath.cx) [89.246.162.166] by mail.gmx.net (mp007) with SMTP; 05 Sep 2010 01:58:54 +0200 X-Authenticated: #15668376 X-Provags-ID: V01U2FsdGVkX19KcV9xtRxK4XpnOp/OD8CBcyIC91sG0HAAiA9KOo rbvWxjNz/+7kfJ From: Sven Eckelmann To: greg@kroah.com Date: Sun, 5 Sep 2010 01:58:26 +0200 Message-Id: <1283644718-653-10-git-send-email-sven.eckelmann@gmx.de> X-Mailer: git-send-email 1.7.1 In-Reply-To: <1283644718-653-1-git-send-email-sven.eckelmann@gmx.de> References: <1283644718-653-1-git-send-email-sven.eckelmann@gmx.de> X-Y-GMX-Trusted: 0 Cc: b.a.t.m.a.n@lists.open-mesh.net Subject: [B.A.T.M.A.N.] [PATCH 09/21] Staging: batman-adv: Directly prepare icmp packets in socket buffer X-BeenThere: b.a.t.m.a.n@lists.open-mesh.org X-Mailman-Version: 2.1.11 Precedence: list Reply-To: The list for a Better Approach To Mobile Ad-hoc Networking List-Id: The list for a Better Approach To Mobile Ad-hoc Networking List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 04 Sep 2010 23:58:57 -0000 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 --- drivers/staging/batman-adv/icmp_socket.c | 60 +++++++++++++++++++----------- 1 files changed, 38 insertions(+), 22 deletions(-) diff --git a/drivers/staging/batman-adv/icmp_socket.c b/drivers/staging/batman-adv/icmp_socket.c index 3ae7dd2..8e986a1 100644 --- a/drivers/staging/batman-adv/icmp_socket.c +++ b/drivers/staging/batman-adv/icmp_socket.c @@ -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; }