#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) {
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 =
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;
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;
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)
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;
/* 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;
projects / firefly-linux-kernel-4.4.55.git / blobdiff