2 * Copyright (C) 2010 B.A.T.M.A.N. contributors:
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.
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.
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
25 #include "soft-interface.h"
27 #include "translation-table.h"
29 #include "hard-interface.h"
32 struct sk_buff *merge_frag_packet(struct list_head *head,
33 struct frag_packet_list_entry *tfp,
36 struct unicast_frag_packet *up =
37 (struct unicast_frag_packet *)skb->data;
38 struct sk_buff *tmp_skb;
40 /* set skb to the first part and tmp_skb to the second part */
41 if (up->flags & UNI_FRAG_HEAD) {
48 skb_pull(tmp_skb, sizeof(struct unicast_frag_packet));
49 if (pskb_expand_head(skb, 0, tmp_skb->len, GFP_ATOMIC) < 0) {
50 /* free buffered skb, skb will be freed later */
55 /* move free entry to end */
58 list_move_tail(&tfp->list, head);
60 memcpy(skb_put(skb, tmp_skb->len), tmp_skb->data, tmp_skb->len);
65 void create_frag_entry(struct list_head *head, struct sk_buff *skb)
67 struct frag_packet_list_entry *tfp;
68 struct unicast_frag_packet *up =
69 (struct unicast_frag_packet *)skb->data;
71 /* free and oldest packets stand at the end */
72 tfp = list_entry((head)->prev, typeof(*tfp), list);
75 tfp->seqno = ntohs(up->seqno);
77 list_move(&tfp->list, head);
81 int create_frag_buffer(struct list_head *head)
84 struct frag_packet_list_entry *tfp;
86 for (i = 0; i < FRAG_BUFFER_SIZE; i++) {
87 tfp = kmalloc(sizeof(struct frag_packet_list_entry),
95 INIT_LIST_HEAD(&tfp->list);
96 list_add(&tfp->list, head);
102 struct frag_packet_list_entry *search_frag_packet(struct list_head *head,
103 struct unicast_frag_packet *up)
105 struct frag_packet_list_entry *tfp;
106 struct unicast_frag_packet *tmp_up = NULL;
107 uint16_t search_seqno;
109 if (up->flags & UNI_FRAG_HEAD)
110 search_seqno = ntohs(up->seqno)+1;
112 search_seqno = ntohs(up->seqno)-1;
114 list_for_each_entry(tfp, head, list) {
119 if (tfp->seqno == ntohs(up->seqno))
122 tmp_up = (struct unicast_frag_packet *)tfp->skb->data;
124 if (tfp->seqno == search_seqno) {
126 if ((tmp_up->flags & UNI_FRAG_HEAD) !=
127 (up->flags & UNI_FRAG_HEAD))
136 list_move_tail(&tfp->list, head);
140 void frag_list_free(struct list_head *head)
142 struct frag_packet_list_entry *pf, *tmp_pf;
144 if (!list_empty(head)) {
146 list_for_each_entry_safe(pf, tmp_pf, head, list) {
155 static int unicast_send_frag_skb(struct sk_buff *skb, struct bat_priv *bat_priv,
156 struct batman_if *batman_if, uint8_t dstaddr[],
157 struct orig_node *orig_node)
159 struct unicast_frag_packet *ucast_frag1, *ucast_frag2;
160 int hdr_len = sizeof(struct unicast_frag_packet);
161 struct sk_buff *frag_skb;
162 int data_len = skb->len;
164 if (!bat_priv->primary_if)
167 frag_skb = dev_alloc_skb(data_len - (data_len / 2) + hdr_len);
168 skb_split(skb, frag_skb, data_len / 2);
170 if (my_skb_head_push(frag_skb, hdr_len) < 0 ||
171 my_skb_head_push(skb, hdr_len) < 0)
174 ucast_frag1 = (struct unicast_frag_packet *)skb->data;
175 ucast_frag2 = (struct unicast_frag_packet *)frag_skb->data;
177 ucast_frag1->version = COMPAT_VERSION;
178 ucast_frag1->packet_type = BAT_UNICAST_FRAG;
179 ucast_frag1->ttl = TTL;
180 memcpy(ucast_frag1->orig,
181 bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
182 memcpy(ucast_frag1->dest, orig_node->orig, ETH_ALEN);
184 memcpy(ucast_frag2, ucast_frag1, sizeof(struct unicast_frag_packet));
186 ucast_frag1->flags |= UNI_FRAG_HEAD;
187 ucast_frag2->flags &= ~UNI_FRAG_HEAD;
189 ucast_frag1->seqno = htons((uint16_t)atomic_inc_return(
190 &batman_if->frag_seqno));
192 ucast_frag2->seqno = htons((uint16_t)atomic_inc_return(
193 &batman_if->frag_seqno));
195 send_skb_packet(skb, batman_if, dstaddr);
196 send_skb_packet(frag_skb, batman_if, dstaddr);
206 int unicast_send_skb(struct sk_buff *skb, struct bat_priv *bat_priv)
208 struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
209 struct unicast_packet *unicast_packet;
210 struct orig_node *orig_node;
211 struct batman_if *batman_if;
212 struct neigh_node *router;
213 int data_len = skb->len;
217 spin_lock_irqsave(&bat_priv->orig_hash_lock, flags);
219 /* get routing information */
220 orig_node = ((struct orig_node *)hash_find(bat_priv->orig_hash,
223 /* check for hna host */
225 orig_node = transtable_search(bat_priv, ethhdr->h_dest);
227 router = find_router(bat_priv, orig_node, NULL);
232 /* don't lock while sending the packets ... we therefore
233 * copy the required data before sending */
235 batman_if = router->if_incoming;
236 memcpy(dstaddr, router->addr, ETH_ALEN);
238 spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
240 if (batman_if->if_status != IF_ACTIVE)
243 if (atomic_read(&bat_priv->frag_enabled) &&
244 data_len + sizeof(struct unicast_packet) > batman_if->net_dev->mtu)
245 return unicast_send_frag_skb(skb, bat_priv, batman_if,
248 if (my_skb_head_push(skb, sizeof(struct unicast_packet)) < 0)
251 unicast_packet = (struct unicast_packet *)skb->data;
253 unicast_packet->version = COMPAT_VERSION;
254 /* batman packet type: unicast */
255 unicast_packet->packet_type = BAT_UNICAST;
256 /* set unicast ttl */
257 unicast_packet->ttl = TTL;
258 /* copy the destination for faster routing */
259 memcpy(unicast_packet->dest, orig_node->orig, ETH_ALEN);
261 send_skb_packet(skb, batman_if, dstaddr);
265 spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);