[deliverable/linux.git] / net / batman-adv / unicast.c

/*
 * Copyright (C) 2010-2011 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 "gateway_client.h"
#include "originator.h"
#include "hash.h"
#include "translation-table.h"
#include "routing.h"
#include "hard-interface.h"


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(*unicast_packet);
	int uni_diff = sizeof(*up) - hdr_len;

	/* 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;
	}

	if (skb_linearize(skb) < 0 || skb_linearize(tmp_skb) < 0)
		goto err;

	skb_pull(tmp_skb, sizeof(*up));
	if (pskb_expand_head(skb, 0, tmp_skb->len, GFP_ATOMIC) < 0)
		goto err;

	/* 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);

	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;

err:
	/* free buffered skb, skb will be freed later */
	kfree_skb(tfp->skb);
	return NULL;
}

static void frag_create_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;
}

static int frag_create_buffer(struct list_head *head)
{
	int i;
	struct frag_packet_list_entry *tfp;

	for (i = 0; i < FRAG_BUFFER_SIZE; i++) {
		tfp = kmalloc(sizeof(*tfp), 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;
}

static struct frag_packet_list_entry *frag_search_packet(struct list_head *head,
					   const 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;
}

/* 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 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;

	orig_node = orig_hash_find(bat_priv, unicast_packet->orig);
	if (!orig_node)
		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:
	if (orig_node)
		orig_node_free_ref(orig_node);
	return ret;
}

int frag_send_skb(struct sk_buff *skb, struct bat_priv *bat_priv,
		  struct hard_iface *hard_iface, const uint8_t dstaddr[])
{
	struct unicast_packet tmp_uc, *unicast_packet;
	struct hard_iface *primary_if;
	struct sk_buff *frag_skb;
	struct unicast_frag_packet *frag1, *frag2;
	int uc_hdr_len = sizeof(*unicast_packet);
	int ucf_hdr_len = sizeof(*frag1);
	int data_len = skb->len - uc_hdr_len;
	int large_tail = 0, ret = NET_RX_DROP;
	uint16_t seqno;

	primary_if = primary_if_get_selected(bat_priv);
	if (!primary_if)
		goto dropped;

	frag_skb = dev_alloc_skb(data_len - (data_len / 2) + ucf_hdr_len);
	if (!frag_skb)
		goto dropped;
	skb_reserve(frag_skb, ucf_hdr_len);

	unicast_packet = (struct unicast_packet *) skb->data;
	memcpy(&tmp_uc, unicast_packet, uc_hdr_len);
	skb_split(skb, frag_skb, data_len / 2 + uc_hdr_len);

	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;

	frag1 = (struct unicast_frag_packet *)skb->data;
	frag2 = (struct unicast_frag_packet *)frag_skb->data;

	memcpy(frag1, &tmp_uc, sizeof(tmp_uc));

	frag1->ttl--;
	frag1->version = COMPAT_VERSION;
	frag1->packet_type = BAT_UNICAST_FRAG;

	memcpy(frag1->orig, primary_if->net_dev->dev_addr, ETH_ALEN);
	memcpy(frag2, frag1, sizeof(*frag2));

	if (data_len & 1)
		large_tail = UNI_FRAG_LARGETAIL;

	frag1->flags = UNI_FRAG_HEAD | large_tail;
	frag2->flags = large_tail;

	seqno = atomic_add_return(2, &hard_iface->frag_seqno);
	frag1->seqno = htons(seqno - 1);
	frag2->seqno = htons(seqno);

	send_skb_packet(skb, hard_iface, dstaddr);
	send_skb_packet(frag_skb, hard_iface, dstaddr);
	ret = NET_RX_SUCCESS;
	goto out;

drop_frag:
	kfree_skb(frag_skb);
dropped:
	kfree_skb(skb);
out:
	if (primary_if)
		hardif_free_ref(primary_if);
	return ret;
}

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 neigh_node *neigh_node;
	int data_len = skb->len;
	int ret = 1;

	/* get routing information */
	if (is_multicast_ether_addr(ethhdr->h_dest)) {
		orig_node = gw_get_selected_orig(bat_priv);
		if (orig_node)
			goto find_router;
	}

	/* check for tt host - increases orig_node refcount.
	 * returns NULL in case of AP isolation */
	orig_node = transtable_search(bat_priv, ethhdr->h_source,
				      ethhdr->h_dest);

find_router:
	/**
	 * find_router():
	 *  - if orig_node is NULL it returns NULL
	 *  - increases neigh_nodes refcount if found.
	 */
	neigh_node = find_router(bat_priv, orig_node, NULL);

	if (!neigh_node)
		goto out;

	if (my_skb_head_push(skb, sizeof(*unicast_packet)) < 0)
		goto out;

	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);
	/* set the destination tt version number */
	unicast_packet->ttvn =
		(uint8_t)atomic_read(&orig_node->last_ttvn);

	if (atomic_read(&bat_priv->fragmentation) &&
	    data_len + sizeof(*unicast_packet) >
				neigh_node->if_incoming->net_dev->mtu) {
		/* send frag skb decreases ttl */
		unicast_packet->ttl++;
		ret = frag_send_skb(skb, bat_priv,
				    neigh_node->if_incoming, neigh_node->addr);
		goto out;
	}

	send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
	ret = 0;
	goto out;

out:
	if (neigh_node)
		neigh_node_free_ref(neigh_node);
	if (orig_node)
		orig_node_free_ref(orig_node);
	if (ret == 1)
		kfree_skb(skb);
	return ret;
}
Commit	Line	Data
c6c8fea2	1	/*
64afe353	2	* Copyright (C) 2010-2011 B.A.T.M.A.N. contributors:
c6c8fea2 SE	3	*
	4	* Andreas Langer
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of version 2 of the GNU General Public
	8	* License as published by the Free Software Foundation.
	9	*
	10	* This program is distributed in the hope that it will be useful, but
	11	* WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	13	* General Public License for more details.
	14	*
	15	* You should have received a copy of the GNU General Public License
	16	* along with this program; if not, write to the Free Software
	17	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
	18	* 02110-1301, USA
	19	*
	20	*/
	21
	22	#include "main.h"
	23	#include "unicast.h"
	24	#include "send.h"
	25	#include "soft-interface.h"
	26	#include "gateway_client.h"
	27	#include "originator.h"
	28	#include "hash.h"
	29	#include "translation-table.h"
	30	#include "routing.h"
	31	#include "hard-interface.h"
	32
	33
	34	static struct sk_buff frag_merge_packet(struct list_head head,
	35	struct frag_packet_list_entry *tfp,
	36	struct sk_buff *skb)
	37	{
	38	struct unicast_frag_packet *up =
	39	(struct unicast_frag_packet *)skb->data;
	40	struct sk_buff *tmp_skb;
	41	struct unicast_packet *unicast_packet;
704509b8 SE	42	int hdr_len = sizeof(*unicast_packet);
704509b8 SE	43	int uni_diff = sizeof(*up) - hdr_len;
c6c8fea2 SE	44
	45	/* set skb to the first part and tmp_skb to the second part */
	46	if (up->flags & UNI_FRAG_HEAD) {
	47	tmp_skb = tfp->skb;
	48	} else {
	49	tmp_skb = skb;
	50	skb = tfp->skb;
	51	}
	52
531c9da8 SE	53	if (skb_linearize(skb) < 0 \|\| skb_linearize(tmp_skb) < 0)
	54	goto err;
	55
704509b8	56	skb_pull(tmp_skb, sizeof(*up));
531c9da8 SE	57	if (pskb_expand_head(skb, 0, tmp_skb->len, GFP_ATOMIC) < 0)
531c9da8 SE	58	goto err;
c6c8fea2 SE	59
	60	/* move free entry to end */
	61	tfp->skb = NULL;
	62	tfp->seqno = 0;
	63	list_move_tail(&tfp->list, head);
	64
	65	memcpy(skb_put(skb, tmp_skb->len), tmp_skb->data, tmp_skb->len);
	66	kfree_skb(tmp_skb);
	67
	68	memmove(skb->data + uni_diff, skb->data, hdr_len);
	69	unicast_packet = (struct unicast_packet *) skb_pull(skb, uni_diff);
	70	unicast_packet->packet_type = BAT_UNICAST;
	71
	72	return skb;
531c9da8 SE	73
	74	err:
	75	/* free buffered skb, skb will be freed later */
	76	kfree_skb(tfp->skb);
	77	return NULL;
c6c8fea2 SE	78	}
	79
	80	static void frag_create_entry(struct list_head head, struct sk_buff skb)
	81	{
	82	struct frag_packet_list_entry *tfp;
	83	struct unicast_frag_packet *up =
	84	(struct unicast_frag_packet *)skb->data;
	85
	86	/* free and oldest packets stand at the end */
	87	tfp = list_entry((head)->prev, typeof(*tfp), list);
	88	kfree_skb(tfp->skb);
	89
	90	tfp->seqno = ntohs(up->seqno);
	91	tfp->skb = skb;
	92	list_move(&tfp->list, head);
	93	return;
	94	}
	95
	96	static int frag_create_buffer(struct list_head *head)
	97	{
	98	int i;
	99	struct frag_packet_list_entry *tfp;
	100
	101	for (i = 0; i < FRAG_BUFFER_SIZE; i++) {
704509b8	102	tfp = kmalloc(sizeof(*tfp), GFP_ATOMIC);
c6c8fea2 SE	103	if (!tfp) {
	104	frag_list_free(head);
	105	return -ENOMEM;
	106	}
	107	tfp->skb = NULL;
	108	tfp->seqno = 0;
	109	INIT_LIST_HEAD(&tfp->list);
	110	list_add(&tfp->list, head);
	111	}
	112
	113	return 0;
	114	}
	115
	116	static struct frag_packet_list_entry frag_search_packet(struct list_head head,
747e4221	117	const struct unicast_frag_packet *up)
c6c8fea2 SE	118	{
	119	struct frag_packet_list_entry *tfp;
	120	struct unicast_frag_packet *tmp_up = NULL;
	121	uint16_t search_seqno;
	122
	123	if (up->flags & UNI_FRAG_HEAD)
	124	search_seqno = ntohs(up->seqno)+1;
	125	else
	126	search_seqno = ntohs(up->seqno)-1;
	127
	128	list_for_each_entry(tfp, head, list) {
	129
	130	if (!tfp->skb)
	131	continue;
	132
	133	if (tfp->seqno == ntohs(up->seqno))
	134	goto mov_tail;
	135
	136	tmp_up = (struct unicast_frag_packet *)tfp->skb->data;
	137
	138	if (tfp->seqno == search_seqno) {
	139
	140	if ((tmp_up->flags & UNI_FRAG_HEAD) !=
	141	(up->flags & UNI_FRAG_HEAD))
	142	return tfp;
	143	else
	144	goto mov_tail;
	145	}
	146	}
	147	return NULL;
	148
	149	mov_tail:
	150	list_move_tail(&tfp->list, head);
	151	return NULL;
	152	}
	153
	154	void frag_list_free(struct list_head *head)
	155	{
	156	struct frag_packet_list_entry pf, tmp_pf;
	157
	158	if (!list_empty(head)) {
	159
	160	list_for_each_entry_safe(pf, tmp_pf, head, list) {
	161	kfree_skb(pf->skb);
	162	list_del(&pf->list);
	163	kfree(pf);
	164	}
	165	}
	166	return;
	167	}
	168
	169	/* frag_reassemble_skb():
	170	* returns NET_RX_DROP if the operation failed - skb is left intact
	171	* returns NET_RX_SUCCESS if the fragment was buffered (skb_new will be NULL)
	172	* or the skb could be reassembled (skb_new will point to the new packet and
	173	* skb was freed)
	174	*/
	175	int frag_reassemble_skb(struct sk_buff skb, struct bat_priv bat_priv,
	176	struct sk_buff **new_skb)
	177	{
	178	struct orig_node *orig_node;
	179	struct frag_packet_list_entry *tmp_frag_entry;
	180	int ret = NET_RX_DROP;
	181	struct unicast_frag_packet *unicast_packet =
182	(struct unicast_frag_packet *)skb->data;
183
184	*new_skb = NULL;
c6c8fea2	185
7aadf889 ML	186	orig_node = orig_hash_find(bat_priv, unicast_packet->orig);
7aadf889 ML	187	if (!orig_node)
c6c8fea2	188	goto out;
c6c8fea2 SE	189
	190	orig_node->last_frag_packet = jiffies;
	191
	192	if (list_empty(&orig_node->frag_list) &&
	193	frag_create_buffer(&orig_node->frag_list)) {
	194	pr_debug("couldn't create frag buffer\n");
	195	goto out;
	196	}
	197
	198	tmp_frag_entry = frag_search_packet(&orig_node->frag_list,
	199	unicast_packet);
	200
	201	if (!tmp_frag_entry) {
	202	frag_create_entry(&orig_node->frag_list, skb);
	203	ret = NET_RX_SUCCESS;
	204	goto out;
	205	}
	206
	207	*new_skb = frag_merge_packet(&orig_node->frag_list, tmp_frag_entry,
	208	skb);
	209	/* if not, merge failed */
	210	if (*new_skb)
	211	ret = NET_RX_SUCCESS;
c6c8fea2	212
7aadf889 ML	213	out:
7aadf889 ML	214	if (orig_node)
7b36e8ee	215	orig_node_free_ref(orig_node);
c6c8fea2 SE	216	return ret;
	217	}
	218
	219	int frag_send_skb(struct sk_buff skb, struct bat_priv bat_priv,
747e4221	220	struct hard_iface *hard_iface, const uint8_t dstaddr[])
c6c8fea2 SE	221	{
c6c8fea2 SE	222	struct unicast_packet tmp_uc, *unicast_packet;
32ae9b22	223	struct hard_iface *primary_if;
c6c8fea2 SE	224	struct sk_buff *frag_skb;
c6c8fea2 SE	225	struct unicast_frag_packet frag1, frag2;
704509b8 SE	226	int uc_hdr_len = sizeof(*unicast_packet);
704509b8 SE	227	int ucf_hdr_len = sizeof(*frag1);
5c77d8bb	228	int data_len = skb->len - uc_hdr_len;
32ae9b22	229	int large_tail = 0, ret = NET_RX_DROP;
c2f7f0e7	230	uint16_t seqno;
c6c8fea2	231
32ae9b22 ML	232	primary_if = primary_if_get_selected(bat_priv);
32ae9b22 ML	233	if (!primary_if)
c6c8fea2 SE	234	goto dropped;
c6c8fea2 SE	235
ed7809d9 JJ	236	frag_skb = dev_alloc_skb(data_len - (data_len / 2) + ucf_hdr_len);
	237	if (!frag_skb)
	238	goto dropped;
5c77d8bb	239	skb_reserve(frag_skb, ucf_hdr_len);
c6c8fea2	240
ed7809d9	241	unicast_packet = (struct unicast_packet *) skb->data;
c6c8fea2	242	memcpy(&tmp_uc, unicast_packet, uc_hdr_len);
5c77d8bb	243	skb_split(skb, frag_skb, data_len / 2 + uc_hdr_len);
c6c8fea2 SE	244
	245	if (my_skb_head_push(skb, ucf_hdr_len - uc_hdr_len) < 0 \|\|
	246	my_skb_head_push(frag_skb, ucf_hdr_len) < 0)
	247	goto drop_frag;
	248
	249	frag1 = (struct unicast_frag_packet *)skb->data;
	250	frag2 = (struct unicast_frag_packet *)frag_skb->data;
	251
704509b8	252	memcpy(frag1, &tmp_uc, sizeof(tmp_uc));
c6c8fea2 SE	253
	254	frag1->ttl--;
	255	frag1->version = COMPAT_VERSION;
	256	frag1->packet_type = BAT_UNICAST_FRAG;
	257
32ae9b22	258	memcpy(frag1->orig, primary_if->net_dev->dev_addr, ETH_ALEN);
704509b8	259	memcpy(frag2, frag1, sizeof(*frag2));
c6c8fea2	260
ae361ce1 SE	261	if (data_len & 1)
	262	large_tail = UNI_FRAG_LARGETAIL;
	263
	264	frag1->flags = UNI_FRAG_HEAD \| large_tail;
	265	frag2->flags = large_tail;
c6c8fea2	266
e6c10f43	267	seqno = atomic_add_return(2, &hard_iface->frag_seqno);
c2f7f0e7 SE	268	frag1->seqno = htons(seqno - 1);
c2f7f0e7 SE	269	frag2->seqno = htons(seqno);
c6c8fea2	270
e6c10f43 ML	271	send_skb_packet(skb, hard_iface, dstaddr);
e6c10f43 ML	272	send_skb_packet(frag_skb, hard_iface, dstaddr);
32ae9b22 ML	273	ret = NET_RX_SUCCESS;
32ae9b22 ML	274	goto out;
c6c8fea2 SE	275
	276	drop_frag:
	277	kfree_skb(frag_skb);
	278	dropped:
	279	kfree_skb(skb);
32ae9b22 ML	280	out:
	281	if (primary_if)
	282	hardif_free_ref(primary_if);
	283	return ret;
c6c8fea2 SE	284	}
	285
	286	int unicast_send_skb(struct sk_buff skb, struct bat_priv bat_priv)
	287	{
	288	struct ethhdr ethhdr = (struct ethhdr )skb->data;
	289	struct unicast_packet *unicast_packet;
7b36e8ee	290	struct orig_node *orig_node;
44524fcd	291	struct neigh_node *neigh_node;
c6c8fea2	292	int data_len = skb->len;
44524fcd	293	int ret = 1;
c6c8fea2 SE	294
c6c8fea2 SE	295	/* get routing information */
43c70ad5	296	if (is_multicast_ether_addr(ethhdr->h_dest)) {
958ca598	297	orig_node = gw_get_selected_orig(bat_priv);
43c70ad5	298	if (orig_node)
44524fcd ML	299	goto find_router;
44524fcd ML	300	}
c6c8fea2	301
3d393e47 AQ	302	/* check for tt host - increases orig_node refcount.
	303	* returns NULL in case of AP isolation */
	304	orig_node = transtable_search(bat_priv, ethhdr->h_source,
	305	ethhdr->h_dest);
c6c8fea2	306
44524fcd	307	find_router:
d0072609 ML	308	/**
	309	* find_router():
	310	* - if orig_node is NULL it returns NULL
	311	* - increases neigh_nodes refcount if found.
	312	*/
44524fcd	313	neigh_node = find_router(bat_priv, orig_node, NULL);
c6c8fea2	314
44524fcd	315	if (!neigh_node)
d0072609	316	goto out;
c6c8fea2	317
704509b8	318	if (my_skb_head_push(skb, sizeof(*unicast_packet)) < 0)
d0072609	319	goto out;
c6c8fea2 SE	320
	321	unicast_packet = (struct unicast_packet *)skb->data;
	322
	323	unicast_packet->version = COMPAT_VERSION;
	324	/* batman packet type: unicast */
	325	unicast_packet->packet_type = BAT_UNICAST;
	326	/* set unicast ttl */
	327	unicast_packet->ttl = TTL;
	328	/* copy the destination for faster routing */
	329	memcpy(unicast_packet->dest, orig_node->orig, ETH_ALEN);
a73105b8 AQ	330	/* set the destination tt version number */
	331	unicast_packet->ttvn =
	332	(uint8_t)atomic_read(&orig_node->last_ttvn);
c6c8fea2 SE	333
c6c8fea2 SE	334	if (atomic_read(&bat_priv->fragmentation) &&
704509b8	335	data_len + sizeof(*unicast_packet) >
d0072609	336	neigh_node->if_incoming->net_dev->mtu) {
c6c8fea2 SE	337	/* send frag skb decreases ttl */
c6c8fea2 SE	338	unicast_packet->ttl++;
d0072609 ML	339	ret = frag_send_skb(skb, bat_priv,
d0072609 ML	340	neigh_node->if_incoming, neigh_node->addr);
44524fcd	341	goto out;
c6c8fea2	342	}
c6c8fea2	343
d0072609	344	send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
44524fcd ML	345	ret = 0;
44524fcd ML	346	goto out;
c6c8fea2	347
44524fcd ML	348	out:
	349	if (neigh_node)
	350	neigh_node_free_ref(neigh_node);
	351	if (orig_node)
7b36e8ee	352	orig_node_free_ref(orig_node);
44524fcd ML	353	if (ret == 1)
	354	kfree_skb(skb);
	355	return ret;
c6c8fea2	356	}