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 void 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),
91 INIT_LIST_HEAD(&tfp->list);
92 list_add(&tfp->list, head);
98 struct frag_packet_list_entry *search_frag_packet(struct list_head *head,
99 struct unicast_frag_packet *up)
101 struct frag_packet_list_entry *tfp;
102 struct unicast_frag_packet *tmp_up = NULL;
103 uint16_t search_seqno;
105 if (up->flags & UNI_FRAG_HEAD)
106 search_seqno = ntohs(up->seqno)+1;
108 search_seqno = ntohs(up->seqno)-1;
110 list_for_each_entry(tfp, head, list) {
115 if (tfp->seqno == ntohs(up->seqno))
118 tmp_up = (struct unicast_frag_packet *) tfp->skb->data;
120 if (tfp->seqno == search_seqno) {
122 if ((tmp_up->flags & UNI_FRAG_HEAD) !=
123 (up->flags & UNI_FRAG_HEAD))
132 list_move_tail(&tfp->list, head);
136 void frag_list_free(struct list_head *head)
138 struct frag_packet_list_entry *pf, *tmp_pf;
140 if (!list_empty(head)) {
142 list_for_each_entry_safe(pf, tmp_pf, head, list) {
151 static int unicast_send_frag_skb(struct sk_buff *skb, struct bat_priv *bat_priv,
152 struct batman_if *batman_if, uint8_t dstaddr[],
153 struct orig_node *orig_node)
155 struct unicast_frag_packet *ucast_frag1, *ucast_frag2;
156 int hdr_len = sizeof(struct unicast_frag_packet);
157 struct sk_buff *frag_skb;
158 int data_len = skb->len;
160 if (!bat_priv->primary_if)
163 frag_skb = dev_alloc_skb(data_len - (data_len / 2) + hdr_len);
164 skb_split(skb, frag_skb, data_len / 2);
166 if (my_skb_head_push(frag_skb, hdr_len) < 0 ||
167 my_skb_head_push(skb, hdr_len) < 0)
170 ucast_frag1 = (struct unicast_frag_packet *)skb->data;
171 ucast_frag2 = (struct unicast_frag_packet *)frag_skb->data;
173 ucast_frag1->version = COMPAT_VERSION;
174 ucast_frag1->packet_type = BAT_UNICAST_FRAG;
175 ucast_frag1->ttl = TTL;
176 memcpy(ucast_frag1->orig,
177 bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
178 memcpy(ucast_frag1->dest, orig_node->orig, ETH_ALEN);
180 memcpy(ucast_frag2, ucast_frag1, sizeof(struct unicast_frag_packet));
182 ucast_frag1->flags |= UNI_FRAG_HEAD;
183 ucast_frag2->flags &= ~UNI_FRAG_HEAD;
185 ucast_frag1->seqno = htons((uint16_t)atomic_inc_return(
186 &batman_if->frag_seqno));
188 ucast_frag2->seqno = htons((uint16_t)atomic_inc_return(
189 &batman_if->frag_seqno));
191 send_skb_packet(skb, batman_if, dstaddr);
192 send_skb_packet(frag_skb, batman_if, dstaddr);
202 int unicast_send_skb(struct sk_buff *skb, struct bat_priv *bat_priv)
204 struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
205 struct unicast_packet *unicast_packet;
206 struct orig_node *orig_node;
207 struct batman_if *batman_if;
208 struct neigh_node *router;
209 int data_len = skb->len;
213 spin_lock_irqsave(&orig_hash_lock, flags);
215 /* get routing information */
216 orig_node = ((struct orig_node *)hash_find(orig_hash, ethhdr->h_dest));
218 /* check for hna host */
220 orig_node = transtable_search(ethhdr->h_dest);
222 router = find_router(orig_node, NULL);
227 /* don't lock while sending the packets ... we therefore
228 * copy the required data before sending */
230 batman_if = router->if_incoming;
231 memcpy(dstaddr, router->addr, ETH_ALEN);
233 spin_unlock_irqrestore(&orig_hash_lock, flags);
235 if (batman_if->if_status != IF_ACTIVE)
238 if (atomic_read(&bat_priv->frag_enabled) &&
239 data_len + sizeof(struct unicast_packet) > batman_if->net_dev->mtu)
240 return unicast_send_frag_skb(skb, bat_priv, batman_if,
243 if (my_skb_head_push(skb, sizeof(struct unicast_packet)) < 0)
246 unicast_packet = (struct unicast_packet *)skb->data;
248 unicast_packet->version = COMPAT_VERSION;
249 /* batman packet type: unicast */
250 unicast_packet->packet_type = BAT_UNICAST;
251 /* set unicast ttl */
252 unicast_packet->ttl = TTL;
253 /* copy the destination for faster routing */
254 memcpy(unicast_packet->dest, orig_node->orig, ETH_ALEN);
256 send_skb_packet(skb, batman_if, dstaddr);
260 spin_unlock_irqrestore(&orig_hash_lock, flags);