X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=drivers%2Fstaging%2Fbatman-adv%2Funicast.c;h=5ae959327b489dd597143b9985f14728b3ed061d;hb=641ee3f8f4375bde4e216aacd26d286a34efed61;hp=0dac50d69c03c13b0dec25f95c93dae2f93ddd45;hpb=d8d048f69a618c531575cb1f398a7186f0532ef2;p=firefly-linux-kernel-4.4.55.git

diff --git a/drivers/staging/batman-adv/unicast.c b/drivers/staging/batman-adv/unicast.c
index 0dac50d69c03..5ae959327b48 100644
--- a/drivers/staging/batman-adv/unicast.c
+++ b/drivers/staging/batman-adv/unicast.c
@@ -29,13 +29,16 @@
 #include "hard-interface.h"
 
 
-struct sk_buff *merge_frag_packet(struct list_head *head,
-				  struct frag_packet_list_entry *tfp,
-				  struct sk_buff *skb)
+static struct sk_buff *frag_merge_packet(struct list_head *head,
+					 struct frag_packet_list_entry *tfp,
+					 struct sk_buff *skb)
 {
 	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) {
@@ -59,10 +62,15 @@ struct sk_buff *merge_frag_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;
 }
 
-void create_frag_entry(struct list_head *head, struct sk_buff *skb)
+static void frag_create_entry(struct list_head *head, struct sk_buff *skb)
 {
 	struct frag_packet_list_entry *tfp;
 	struct unicast_frag_packet *up =
@@ -78,7 +86,7 @@ void create_frag_entry(struct list_head *head, struct sk_buff *skb)
 	return;
 }
 
-int create_frag_buffer(struct list_head *head)
+static int frag_create_buffer(struct list_head *head)
 {
 	int i;
 	struct frag_packet_list_entry *tfp;
@@ -99,7 +107,7 @@ int create_frag_buffer(struct list_head *head)
 	return 0;
 }
 
-struct frag_packet_list_entry *search_frag_packet(struct list_head *head,
+static struct frag_packet_list_entry *frag_search_packet(struct list_head *head,
 						 struct unicast_frag_packet *up)
 {
 	struct frag_packet_list_entry *tfp;
@@ -152,55 +160,112 @@ void frag_list_free(struct list_head *head)
 	return;
 }
 
-static int unicast_send_frag_skb(struct sk_buff *skb, struct bat_priv *bat_priv,
-			  struct batman_if *batman_if, uint8_t dstaddr[],
-			  struct orig_node *orig_node)
+/* frag_reassemble_skb():
+ * returns NET_RX_DROP if the operation failed - skb is left intact
+ * returns NET_RX_SUCCESS if the fragment was buffered (skb_new will be NULL)
+ * or the skb could be reassembled (skb_new will point to the new packet and
+ * skb was freed)
+ */
+int frag_reassemble_skb(struct sk_buff *skb, struct bat_priv *bat_priv,
+			struct sk_buff **new_skb)
 {
-	struct unicast_frag_packet *ucast_frag1, *ucast_frag2;
-	int hdr_len = sizeof(struct unicast_frag_packet);
+	unsigned long flags;
+	struct orig_node *orig_node;
+	struct frag_packet_list_entry *tmp_frag_entry;
+	int ret = NET_RX_DROP;
+	struct unicast_frag_packet *unicast_packet =
+		(struct unicast_frag_packet *)skb->data;
+
+	*new_skb = NULL;
+	spin_lock_irqsave(&bat_priv->orig_hash_lock, flags);
+	orig_node = ((struct orig_node *)
+		    hash_find(bat_priv->orig_hash, unicast_packet->orig));
+
+	if (!orig_node) {
+		pr_debug("couldn't find originator in orig_hash\n");
+		goto out;
+	}
+
+	orig_node->last_frag_packet = jiffies;
+
+	if (list_empty(&orig_node->frag_list) &&
+	    frag_create_buffer(&orig_node->frag_list)) {
+		pr_debug("couldn't create frag buffer\n");
+		goto out;
+	}
+
+	tmp_frag_entry = frag_search_packet(&orig_node->frag_list,
+					    unicast_packet);
+
+	if (!tmp_frag_entry) {
+		frag_create_entry(&orig_node->frag_list, skb);
+		ret = NET_RX_SUCCESS;
+		goto out;
+	}
+
+	*new_skb = frag_merge_packet(&orig_node->frag_list, tmp_frag_entry,
+				     skb);
+	/* if not, merge failed */
+	if (*new_skb)
+		ret = NET_RX_SUCCESS;
+out:
+	spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
+
+	return ret;
+}
+
+int frag_send_skb(struct sk_buff *skb, struct bat_priv *bat_priv,
+		  struct batman_if *batman_if, uint8_t dstaddr[])
+{
+	struct unicast_packet tmp_uc, *unicast_packet;
 	struct sk_buff *frag_skb;
+	struct unicast_frag_packet *frag1, *frag2;
+	int uc_hdr_len = sizeof(struct unicast_packet);
+	int ucf_hdr_len = sizeof(struct unicast_frag_packet);
 	int data_len = skb->len;
 
 	if (!bat_priv->primary_if)
 		goto dropped;
 
-	frag_skb = dev_alloc_skb(data_len - (data_len / 2) + hdr_len);
+	unicast_packet = (struct unicast_packet *) skb->data;
+
+	memcpy(&tmp_uc, unicast_packet, uc_hdr_len);
+	frag_skb = dev_alloc_skb(data_len - (data_len / 2) + ucf_hdr_len);
 	skb_split(skb, frag_skb, data_len / 2);
 
-	if (my_skb_head_push(frag_skb, hdr_len) < 0 ||
-	    my_skb_head_push(skb, hdr_len) < 0)
+	if (my_skb_head_push(skb, ucf_hdr_len - uc_hdr_len) < 0 ||
+	    my_skb_head_push(frag_skb, ucf_hdr_len) < 0)
 		goto drop_frag;
 
-	ucast_frag1 = (struct unicast_frag_packet *)skb->data;
-	ucast_frag2 = (struct unicast_frag_packet *)frag_skb->data;
+	frag1 = (struct unicast_frag_packet *)skb->data;
+	frag2 = (struct unicast_frag_packet *)frag_skb->data;
 
-	ucast_frag1->version = COMPAT_VERSION;
-	ucast_frag1->packet_type = BAT_UNICAST_FRAG;
-	ucast_frag1->ttl = TTL;
-	memcpy(ucast_frag1->orig,
-	       bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
-	memcpy(ucast_frag1->dest, orig_node->orig, ETH_ALEN);
+	memcpy(frag1, &tmp_uc, sizeof(struct unicast_packet));
 
-	memcpy(ucast_frag2, ucast_frag1, sizeof(struct unicast_frag_packet));
+	frag1->ttl--;
+	frag1->version = COMPAT_VERSION;
+	frag1->packet_type = BAT_UNICAST_FRAG;
 
-	ucast_frag1->flags |= UNI_FRAG_HEAD;
-	ucast_frag2->flags &= ~UNI_FRAG_HEAD;
+	memcpy(frag1->orig, bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
+	memcpy(frag2, frag1, sizeof(struct unicast_frag_packet));
 
-	ucast_frag1->seqno = htons((uint16_t)atomic_inc_return(
-						&batman_if->frag_seqno));
+	frag1->flags |= UNI_FRAG_HEAD;
+	frag2->flags &= ~UNI_FRAG_HEAD;
 
-	ucast_frag2->seqno = htons((uint16_t)atomic_inc_return(
-						&batman_if->frag_seqno));
+	frag1->seqno = htons((uint16_t)atomic_inc_return(
+			     &batman_if->frag_seqno));
+	frag2->seqno = htons((uint16_t)atomic_inc_return(
+			     &batman_if->frag_seqno));
 
 	send_skb_packet(skb, batman_if, dstaddr);
 	send_skb_packet(frag_skb, batman_if, dstaddr);
-	return 0;
+	return NET_RX_SUCCESS;
 
 drop_frag:
 	kfree_skb(frag_skb);
 dropped:
 	kfree_skb(skb);
-	return 1;
+	return NET_RX_DROP;
 }
 
 int unicast_send_skb(struct sk_buff *skb, struct bat_priv *bat_priv)
@@ -224,7 +289,7 @@ int unicast_send_skb(struct sk_buff *skb, struct bat_priv *bat_priv)
 	if (!orig_node)
 		orig_node = transtable_search(bat_priv, ethhdr->h_dest);
 
-	router = find_router(orig_node, NULL);
+	router = find_router(bat_priv, orig_node, NULL);
 
 	if (!router)
 		goto unlock;
@@ -240,11 +305,6 @@ int unicast_send_skb(struct sk_buff *skb, struct bat_priv *bat_priv)
 	if (batman_if->if_status != IF_ACTIVE)
 		goto dropped;
 
-	if (atomic_read(&bat_priv->frag_enabled) &&
-	    data_len + sizeof(struct unicast_packet) > batman_if->net_dev->mtu)
-		return unicast_send_frag_skb(skb, bat_priv, batman_if,
-					     dstaddr, orig_node);
-
 	if (my_skb_head_push(skb, sizeof(struct unicast_packet)) < 0)
 		goto dropped;
 
@@ -258,6 +318,14 @@ int unicast_send_skb(struct sk_buff *skb, struct bat_priv *bat_priv)
 	/* copy the destination for faster routing */
 	memcpy(unicast_packet->dest, orig_node->orig, ETH_ALEN);
 
+	if (atomic_read(&bat_priv->fragmentation) &&
+	    data_len + sizeof(struct unicast_packet) >
+	    batman_if->net_dev->mtu) {
+		/* send frag skb decreases ttl */
+		unicast_packet->ttl++;
+		return frag_send_skb(skb, bat_priv, batman_if,
+				     dstaddr);
+	}
 	send_skb_packet(skb, batman_if, dstaddr);
 	return 0;