blob: 0459413ff67ff73a06f822038385d1005dee11b5 [file] [log] [blame]
/*
* Copyright (C) 2010 B.A.T.M.A.N. contributors:
*
* Andreas Langer
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of version 2 of the GNU General Public
* License as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA
*
*/
#include "main.h"
#include "unicast.h"
#include "send.h"
#include "soft-interface.h"
#include "hash.h"
#include "translation-table.h"
#include "routing.h"
#include "hard-interface.h"
struct sk_buff *merge_frag_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;
/* set skb to the first part and tmp_skb to the second part */
if (up->flags & UNI_FRAG_HEAD) {
tmp_skb = tfp->skb;
} else {
tmp_skb = skb;
skb = tfp->skb;
}
skb_pull(tmp_skb, sizeof(struct unicast_frag_packet));
if (pskb_expand_head(skb, 0, tmp_skb->len, GFP_ATOMIC) < 0) {
/* free buffered skb, skb will be freed later */
kfree_skb(tfp->skb);
return NULL;
}
/* move free entry to end */
tfp->skb = NULL;
tfp->seqno = 0;
list_move_tail(&tfp->list, head);
memcpy(skb_put(skb, tmp_skb->len), tmp_skb->data, tmp_skb->len);
kfree_skb(tmp_skb);
return skb;
}
void create_frag_entry(struct list_head *head, struct sk_buff *skb)
{
struct frag_packet_list_entry *tfp;
struct unicast_frag_packet *up =
(struct unicast_frag_packet *)skb->data;
/* free and oldest packets stand at the end */
tfp = list_entry((head)->prev, typeof(*tfp), list);
kfree_skb(tfp->skb);
tfp->seqno = ntohs(up->seqno);
tfp->skb = skb;
list_move(&tfp->list, head);
return;
}
int create_frag_buffer(struct list_head *head)
{
int i;
struct frag_packet_list_entry *tfp;
for (i = 0; i < FRAG_BUFFER_SIZE; i++) {
tfp = kmalloc(sizeof(struct frag_packet_list_entry),
GFP_ATOMIC);
if (!tfp) {
frag_list_free(head);
return -ENOMEM;
}
tfp->skb = NULL;
tfp->seqno = 0;
INIT_LIST_HEAD(&tfp->list);
list_add(&tfp->list, head);
}
return 0;
}
struct frag_packet_list_entry *search_frag_packet(struct list_head *head,
struct unicast_frag_packet *up)
{
struct frag_packet_list_entry *tfp;
struct unicast_frag_packet *tmp_up = NULL;
uint16_t search_seqno;
if (up->flags & UNI_FRAG_HEAD)
search_seqno = ntohs(up->seqno)+1;
else
search_seqno = ntohs(up->seqno)-1;
list_for_each_entry(tfp, head, list) {
if (!tfp->skb)
continue;
if (tfp->seqno == ntohs(up->seqno))
goto mov_tail;
tmp_up = (struct unicast_frag_packet *)tfp->skb->data;
if (tfp->seqno == search_seqno) {
if ((tmp_up->flags & UNI_FRAG_HEAD) !=
(up->flags & UNI_FRAG_HEAD))
return tfp;
else
goto mov_tail;
}
}
return NULL;
mov_tail:
list_move_tail(&tfp->list, head);
return NULL;
}
void frag_list_free(struct list_head *head)
{
struct frag_packet_list_entry *pf, *tmp_pf;
if (!list_empty(head)) {
list_for_each_entry_safe(pf, tmp_pf, head, list) {
kfree_skb(pf->skb);
list_del(&pf->list);
kfree(pf);
}
}
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)
{
struct unicast_frag_packet *ucast_frag1, *ucast_frag2;
int hdr_len = sizeof(struct unicast_frag_packet);
struct sk_buff *frag_skb;
int data_len = skb->len;
if (!bat_priv->primary_if)
goto dropped;
frag_skb = dev_alloc_skb(data_len - (data_len / 2) + 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)
goto drop_frag;
ucast_frag1 = (struct unicast_frag_packet *)skb->data;
ucast_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(ucast_frag2, ucast_frag1, sizeof(struct unicast_frag_packet));
ucast_frag1->flags |= UNI_FRAG_HEAD;
ucast_frag2->flags &= ~UNI_FRAG_HEAD;
ucast_frag1->seqno = htons((uint16_t)atomic_inc_return(
&batman_if->frag_seqno));
ucast_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;
drop_frag:
kfree_skb(frag_skb);
dropped:
kfree_skb(skb);
return 1;
}
int unicast_send_skb(struct sk_buff *skb, struct bat_priv *bat_priv)
{
struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
struct unicast_packet *unicast_packet;
struct orig_node *orig_node;
struct batman_if *batman_if;
struct neigh_node *router;
int data_len = skb->len;
uint8_t dstaddr[6];
unsigned long flags;
spin_lock_irqsave(&bat_priv->orig_hash_lock, flags);
/* get routing information */
orig_node = ((struct orig_node *)hash_find(bat_priv->orig_hash,
ethhdr->h_dest));
/* check for hna host */
if (!orig_node)
orig_node = transtable_search(bat_priv, ethhdr->h_dest);
router = find_router(bat_priv, orig_node, NULL);
if (!router)
goto unlock;
/* don't lock while sending the packets ... we therefore
* copy the required data before sending */
batman_if = router->if_incoming;
memcpy(dstaddr, router->addr, ETH_ALEN);
spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
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;
unicast_packet = (struct unicast_packet *)skb->data;
unicast_packet->version = COMPAT_VERSION;
/* batman packet type: unicast */
unicast_packet->packet_type = BAT_UNICAST;
/* set unicast ttl */
unicast_packet->ttl = TTL;
/* copy the destination for faster routing */
memcpy(unicast_packet->dest, orig_node->orig, ETH_ALEN);
send_skb_packet(skb, batman_if, dstaddr);
return 0;
unlock:
spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
dropped:
kfree_skb(skb);
return 1;
}