Staging: batman-adv: reassemble fragmented skb if mtu allows it

Signed-off-by: Andreas Langer <an.langer@gmx.de>
Signed-off-by: Sven Eckelmann <sven.eckelmann@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/batman-adv/routing.c

@@ -1128,6 +1128,8 @@ static int route_unicast_packet(struct sk_buff *skb,
 	unsigned long flags;
 	struct unicast_packet *unicast_packet;
 	struct ethhdr *ethhdr = (struct ethhdr *)skb_mac_header(skb);
+	int ret;
+	struct sk_buff *new_skb;
 
 	unicast_packet = (struct unicast_packet *)skb->data;
 
@@ -1171,6 +1173,22 @@ static int route_unicast_packet(struct sk_buff *skb,
 		return frag_send_skb(skb, bat_priv, batman_if,
 				     dstaddr);
 
+	if (unicast_packet->packet_type == BAT_UNICAST_FRAG &&
+	    2 * skb->len - hdr_size <= batman_if->net_dev->mtu) {
+
+		ret = frag_reassemble_skb(skb, bat_priv, &new_skb);
+
+		if (ret == NET_RX_DROP)
+			return NET_RX_DROP;
+
+		/* packet was buffered for late merge */
+		if (!new_skb)
+			return NET_RX_SUCCESS;
+
+		skb = new_skb;
+		unicast_packet = (struct unicast_packet *) skb->data;
+	}
+
 	/* decrement ttl */
 	unicast_packet->ttl--;
 
@@ -1224,7 +1242,8 @@ int recv_ucast_frag_packet(struct sk_buff *skb, struct batman_if *recv_if)
 		if (!new_skb)
 			return NET_RX_SUCCESS;
 
-		interface_rx(recv_if->soft_iface, new_skb, hdr_size);
+		interface_rx(recv_if->soft_iface, new_skb,
+			     sizeof(struct unicast_packet));
 		return NET_RX_SUCCESS;
 	}
 

drivers/staging/batman-adv/unicast.c

@@ -36,6 +36,9 @@ static struct sk_buff *frag_merge_packet(struct list_head *head,
 	struct unicast_frag_packet *up =
 		(struct unicast_frag_packet *)skb->data;
 	struct sk_buff *tmp_skb;
+	struct unicast_packet *unicast_packet;
+	int hdr_len = sizeof(struct unicast_packet),
+	    uni_diff = sizeof(struct unicast_frag_packet) - hdr_len;
 
 	/* set skb to the first part and tmp_skb to the second part */
 	if (up->flags & UNI_FRAG_HEAD) {
@@ -59,6 +62,11 @@ static struct sk_buff *frag_merge_packet(struct list_head *head,
 
 	memcpy(skb_put(skb, tmp_skb->len), tmp_skb->data, tmp_skb->len);
 	kfree_skb(tmp_skb);
+
+	memmove(skb->data + uni_diff, skb->data, hdr_len);
+	unicast_packet = (struct unicast_packet *) skb_pull(skb, uni_diff);
+	unicast_packet->packet_type = BAT_UNICAST;
+
 	return skb;
 }