@@ -1204,10 +1204,9 @@ int recv_ucast_frag_packet(struct sk_buff *skb, struct batman_if *recv_if)
{
struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
struct unicast_frag_packet *unicast_packet;
- struct orig_node *orig_node;
- struct frag_packet_list_entry *tmp_frag_entry;
int hdr_size = sizeof(struct unicast_frag_packet);
- unsigned long flags;
+ struct sk_buff *new_skb = NULL;
+ int ret;
if (check_unicast_packet(skb, hdr_size) < 0)
return NET_RX_DROP;
@@ -1217,44 +1216,16 @@ int recv_ucast_frag_packet(struct sk_buff *skb, struct batman_if *recv_if)
/* packet for me */
if (is_my_mac(unicast_packet->dest)) {
- spin_lock_irqsave(&bat_priv->orig_hash_lock, flags);
- orig_node = ((struct orig_node *)
- hash_find(bat_priv->orig_hash, unicast_packet->orig));
+ ret = frag_reassemble_skb(skb, bat_priv, &new_skb);
- if (!orig_node) {
- pr_debug("couldn't find orig node for fragmentation\n");
- spin_unlock_irqrestore(&bat_priv->orig_hash_lock,
- flags);
+ if (ret == NET_RX_DROP)
return NET_RX_DROP;
- }
- orig_node->last_frag_packet = jiffies;
-
- if (list_empty(&orig_node->frag_list) &&
- frag_create_buffer(&orig_node->frag_list)) {
- spin_unlock_irqrestore(&bat_priv->orig_hash_lock,
- flags);
- return NET_RX_DROP;
- }
-
- tmp_frag_entry =
- frag_search_packet(&orig_node->frag_list,
- unicast_packet);
-
- if (!tmp_frag_entry) {
- frag_create_entry(&orig_node->frag_list, skb);
- spin_unlock_irqrestore(&bat_priv->orig_hash_lock,
- flags);
+ /* packet was buffered for late merge */
+ if (!new_skb)
return NET_RX_SUCCESS;
- }
- skb = frag_merge_packet(&orig_node->frag_list,
- tmp_frag_entry, skb);
- spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
- if (!skb)
- return NET_RX_DROP;
-
- interface_rx(recv_if->soft_iface, skb, hdr_size);
+ interface_rx(recv_if->soft_iface, new_skb, hdr_size);
return NET_RX_SUCCESS;
}
@@ -29,9 +29,9 @@
#include "hard-interface.h"
-struct sk_buff *frag_merge_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;
@@ -62,7 +62,7 @@ struct sk_buff *frag_merge_packet(struct list_head *head,
return skb;
}
-void frag_create_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 +78,7 @@ void frag_create_entry(struct list_head *head, struct sk_buff *skb)
return;
}
-int frag_create_buffer(struct list_head *head)
+static int frag_create_buffer(struct list_head *head)
{
int i;
struct frag_packet_list_entry *tfp;
@@ -99,7 +99,7 @@ int frag_create_buffer(struct list_head *head)
return 0;
}
-struct frag_packet_list_entry *frag_search_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;
@@ -152,6 +152,60 @@ void frag_list_free(struct list_head *head)
return;
}
+/* 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)
+{
+ 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;
+}
+
static int frag_send_skb(struct sk_buff *skb, struct bat_priv *bat_priv,
struct batman_if *batman_if, uint8_t dstaddr[])
{
@@ -25,14 +25,8 @@
#define FRAG_TIMEOUT 10000 /* purge frag list entrys after time in ms */
#define FRAG_BUFFER_SIZE 6 /* number of list elements in buffer */
-struct sk_buff *frag_merge_packet(struct list_head *head,
- struct frag_packet_list_entry *tfp,
- struct sk_buff *skb);
-
-void frag_create_entry(struct list_head *head, struct sk_buff *skb);
-int frag_create_buffer(struct list_head *head);
-struct frag_packet_list_entry *frag_search_packet(struct list_head *head,
- struct unicast_frag_packet *up);
+int frag_reassemble_skb(struct sk_buff *skb, struct bat_priv *bat_priv,
+ struct sk_buff **new_skb);
void frag_list_free(struct list_head *head);
int unicast_send_skb(struct sk_buff *skb, struct bat_priv *bat_priv);