blob: 10aff49fcf25adb106cefb020309e456d8f04a2f [file] [log] [blame]
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +02001/* Copyright (C) 2010-2012 B.A.T.M.A.N. contributors:
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +00002 *
3 * Andreas Langer
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of version 2 of the GNU General Public
7 * License as published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
17 * 02110-1301, USA
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000018 */
19
20#include "main.h"
21#include "unicast.h"
22#include "send.h"
23#include "soft-interface.h"
24#include "gateway_client.h"
25#include "originator.h"
26#include "hash.h"
27#include "translation-table.h"
28#include "routing.h"
29#include "hard-interface.h"
30
31
Sven Eckelmann03544402012-05-16 20:23:17 +020032static struct sk_buff *
33batadv_frag_merge_packet(struct list_head *head,
Sven Eckelmann56303d32012-06-05 22:31:31 +020034 struct batadv_frag_packet_list_entry *tfp,
Sven Eckelmann03544402012-05-16 20:23:17 +020035 struct sk_buff *skb)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000036{
Sven Eckelmann96412692012-06-05 22:31:30 +020037 struct batadv_unicast_frag_packet *up;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000038 struct sk_buff *tmp_skb;
Sven Eckelmann96412692012-06-05 22:31:30 +020039 struct batadv_unicast_packet *unicast_packet;
Sven Eckelmann704509b2011-05-14 23:14:54 +020040 int hdr_len = sizeof(*unicast_packet);
41 int uni_diff = sizeof(*up) - hdr_len;
Sven Eckelmannc67893d2012-07-08 18:33:51 +020042 uint8_t *packet_pos;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000043
Sven Eckelmann96412692012-06-05 22:31:30 +020044 up = (struct batadv_unicast_frag_packet *)skb->data;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000045 /* set skb to the first part and tmp_skb to the second part */
Sven Eckelmannacd34af2012-06-03 22:19:21 +020046 if (up->flags & BATADV_UNI_FRAG_HEAD) {
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000047 tmp_skb = tfp->skb;
48 } else {
49 tmp_skb = skb;
50 skb = tfp->skb;
51 }
52
Sven Eckelmann531c9da2011-02-06 23:26:43 +000053 if (skb_linearize(skb) < 0 || skb_linearize(tmp_skb) < 0)
54 goto err;
55
Sven Eckelmann704509b2011-05-14 23:14:54 +020056 skb_pull(tmp_skb, sizeof(*up));
Sven Eckelmann531c9da2011-02-06 23:26:43 +000057 if (pskb_expand_head(skb, 0, tmp_skb->len, GFP_ATOMIC) < 0)
58 goto err;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000059
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);
Sven Eckelmannc67893d2012-07-08 18:33:51 +020069 packet_pos = skb_pull(skb, uni_diff);
70 unicast_packet = (struct batadv_unicast_packet *)packet_pos;
Sven Eckelmannacd34af2012-06-03 22:19:21 +020071 unicast_packet->header.packet_type = BATADV_UNICAST;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000072
73 return skb;
Sven Eckelmann531c9da2011-02-06 23:26:43 +000074
75err:
76 /* free buffered skb, skb will be freed later */
77 kfree_skb(tfp->skb);
78 return NULL;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000079}
80
Sven Eckelmann03544402012-05-16 20:23:17 +020081static void batadv_frag_create_entry(struct list_head *head,
82 struct sk_buff *skb)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000083{
Sven Eckelmann56303d32012-06-05 22:31:31 +020084 struct batadv_frag_packet_list_entry *tfp;
Sven Eckelmann96412692012-06-05 22:31:30 +020085 struct batadv_unicast_frag_packet *up;
86
87 up = (struct batadv_unicast_frag_packet *)skb->data;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000088
89 /* free and oldest packets stand at the end */
90 tfp = list_entry((head)->prev, typeof(*tfp), list);
91 kfree_skb(tfp->skb);
92
93 tfp->seqno = ntohs(up->seqno);
94 tfp->skb = skb;
95 list_move(&tfp->list, head);
96 return;
97}
98
Sven Eckelmann03544402012-05-16 20:23:17 +020099static int batadv_frag_create_buffer(struct list_head *head)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000100{
101 int i;
Sven Eckelmann56303d32012-06-05 22:31:31 +0200102 struct batadv_frag_packet_list_entry *tfp;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000103
Sven Eckelmann4d5d2db82012-06-03 22:19:15 +0200104 for (i = 0; i < BATADV_FRAG_BUFFER_SIZE; i++) {
Sven Eckelmann704509b2011-05-14 23:14:54 +0200105 tfp = kmalloc(sizeof(*tfp), GFP_ATOMIC);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000106 if (!tfp) {
Sven Eckelmann88ed1e772012-05-12 02:09:40 +0200107 batadv_frag_list_free(head);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000108 return -ENOMEM;
109 }
110 tfp->skb = NULL;
111 tfp->seqno = 0;
112 INIT_LIST_HEAD(&tfp->list);
113 list_add(&tfp->list, head);
114 }
115
116 return 0;
117}
118
Sven Eckelmann56303d32012-06-05 22:31:31 +0200119static struct batadv_frag_packet_list_entry *
Sven Eckelmann03544402012-05-16 20:23:17 +0200120batadv_frag_search_packet(struct list_head *head,
Sven Eckelmann96412692012-06-05 22:31:30 +0200121 const struct batadv_unicast_frag_packet *up)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000122{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200123 struct batadv_frag_packet_list_entry *tfp;
Sven Eckelmann96412692012-06-05 22:31:30 +0200124 struct batadv_unicast_frag_packet *tmp_up = NULL;
Sven Eckelmannbbb1f902012-07-08 17:13:15 +0200125 int is_head_tmp, is_head;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000126 uint16_t search_seqno;
127
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200128 if (up->flags & BATADV_UNI_FRAG_HEAD)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000129 search_seqno = ntohs(up->seqno)+1;
130 else
131 search_seqno = ntohs(up->seqno)-1;
132
Sven Eckelmannbbb1f902012-07-08 17:13:15 +0200133 is_head = !!(up->flags & BATADV_UNI_FRAG_HEAD);
134
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000135 list_for_each_entry(tfp, head, list) {
136
137 if (!tfp->skb)
138 continue;
139
140 if (tfp->seqno == ntohs(up->seqno))
141 goto mov_tail;
142
Sven Eckelmann96412692012-06-05 22:31:30 +0200143 tmp_up = (struct batadv_unicast_frag_packet *)tfp->skb->data;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000144
145 if (tfp->seqno == search_seqno) {
Sven Eckelmannbbb1f902012-07-08 17:13:15 +0200146 is_head_tmp = !!(tmp_up->flags & BATADV_UNI_FRAG_HEAD);
147 if (is_head_tmp != is_head)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000148 return tfp;
149 else
150 goto mov_tail;
151 }
152 }
153 return NULL;
154
155mov_tail:
156 list_move_tail(&tfp->list, head);
157 return NULL;
158}
159
Sven Eckelmann88ed1e772012-05-12 02:09:40 +0200160void batadv_frag_list_free(struct list_head *head)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000161{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200162 struct batadv_frag_packet_list_entry *pf, *tmp_pf;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000163
164 if (!list_empty(head)) {
165
166 list_for_each_entry_safe(pf, tmp_pf, head, list) {
167 kfree_skb(pf->skb);
168 list_del(&pf->list);
169 kfree(pf);
170 }
171 }
172 return;
173}
174
175/* frag_reassemble_skb():
176 * returns NET_RX_DROP if the operation failed - skb is left intact
177 * returns NET_RX_SUCCESS if the fragment was buffered (skb_new will be NULL)
178 * or the skb could be reassembled (skb_new will point to the new packet and
179 * skb was freed)
180 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200181int batadv_frag_reassemble_skb(struct sk_buff *skb,
182 struct batadv_priv *bat_priv,
Sven Eckelmann88ed1e772012-05-12 02:09:40 +0200183 struct sk_buff **new_skb)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000184{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200185 struct batadv_orig_node *orig_node;
186 struct batadv_frag_packet_list_entry *tmp_frag_entry;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000187 int ret = NET_RX_DROP;
Sven Eckelmann96412692012-06-05 22:31:30 +0200188 struct batadv_unicast_frag_packet *unicast_packet;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000189
Sven Eckelmann96412692012-06-05 22:31:30 +0200190 unicast_packet = (struct batadv_unicast_frag_packet *)skb->data;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000191 *new_skb = NULL;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000192
Sven Eckelmannda641192012-05-12 13:48:56 +0200193 orig_node = batadv_orig_hash_find(bat_priv, unicast_packet->orig);
Marek Lindner7aadf882011-02-18 12:28:09 +0000194 if (!orig_node)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000195 goto out;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000196
197 orig_node->last_frag_packet = jiffies;
198
199 if (list_empty(&orig_node->frag_list) &&
Sven Eckelmann03544402012-05-16 20:23:17 +0200200 batadv_frag_create_buffer(&orig_node->frag_list)) {
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000201 pr_debug("couldn't create frag buffer\n");
202 goto out;
203 }
204
Sven Eckelmann03544402012-05-16 20:23:17 +0200205 tmp_frag_entry = batadv_frag_search_packet(&orig_node->frag_list,
206 unicast_packet);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000207
208 if (!tmp_frag_entry) {
Sven Eckelmann03544402012-05-16 20:23:17 +0200209 batadv_frag_create_entry(&orig_node->frag_list, skb);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000210 ret = NET_RX_SUCCESS;
211 goto out;
212 }
213
Sven Eckelmann03544402012-05-16 20:23:17 +0200214 *new_skb = batadv_frag_merge_packet(&orig_node->frag_list,
215 tmp_frag_entry, skb);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000216 /* if not, merge failed */
217 if (*new_skb)
218 ret = NET_RX_SUCCESS;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000219
Marek Lindner7aadf882011-02-18 12:28:09 +0000220out:
221 if (orig_node)
Sven Eckelmann7d211ef2012-05-12 02:09:34 +0200222 batadv_orig_node_free_ref(orig_node);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000223 return ret;
224}
225
Sven Eckelmann56303d32012-06-05 22:31:31 +0200226int batadv_frag_send_skb(struct sk_buff *skb, struct batadv_priv *bat_priv,
227 struct batadv_hard_iface *hard_iface,
228 const uint8_t dstaddr[])
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000229{
Sven Eckelmann96412692012-06-05 22:31:30 +0200230 struct batadv_unicast_packet tmp_uc, *unicast_packet;
Sven Eckelmann56303d32012-06-05 22:31:31 +0200231 struct batadv_hard_iface *primary_if;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000232 struct sk_buff *frag_skb;
Sven Eckelmann96412692012-06-05 22:31:30 +0200233 struct batadv_unicast_frag_packet *frag1, *frag2;
Sven Eckelmann704509b2011-05-14 23:14:54 +0200234 int uc_hdr_len = sizeof(*unicast_packet);
235 int ucf_hdr_len = sizeof(*frag1);
Sven Eckelmann5c77d8b2011-01-25 21:59:26 +0000236 int data_len = skb->len - uc_hdr_len;
Marek Lindner32ae9b22011-04-20 15:40:58 +0200237 int large_tail = 0, ret = NET_RX_DROP;
Sven Eckelmannc2f7f0e2011-02-10 14:33:56 +0000238 uint16_t seqno;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000239
Sven Eckelmanne5d89252012-05-12 13:48:54 +0200240 primary_if = batadv_primary_if_get_selected(bat_priv);
Marek Lindner32ae9b22011-04-20 15:40:58 +0200241 if (!primary_if)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000242 goto dropped;
243
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000244 frag_skb = dev_alloc_skb(data_len - (data_len / 2) + ucf_hdr_len);
Jesper Juhled7809d2011-01-13 21:53:38 +0100245 if (!frag_skb)
246 goto dropped;
Sven Eckelmann5c77d8b2011-01-25 21:59:26 +0000247 skb_reserve(frag_skb, ucf_hdr_len);
Jesper Juhled7809d2011-01-13 21:53:38 +0100248
Sven Eckelmann96412692012-06-05 22:31:30 +0200249 unicast_packet = (struct batadv_unicast_packet *)skb->data;
Jesper Juhled7809d2011-01-13 21:53:38 +0100250 memcpy(&tmp_uc, unicast_packet, uc_hdr_len);
Sven Eckelmann5c77d8b2011-01-25 21:59:26 +0000251 skb_split(skb, frag_skb, data_len / 2 + uc_hdr_len);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000252
Sven Eckelmann04b482a2012-05-12 02:09:38 +0200253 if (batadv_skb_head_push(skb, ucf_hdr_len - uc_hdr_len) < 0 ||
254 batadv_skb_head_push(frag_skb, ucf_hdr_len) < 0)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000255 goto drop_frag;
256
Sven Eckelmann96412692012-06-05 22:31:30 +0200257 frag1 = (struct batadv_unicast_frag_packet *)skb->data;
258 frag2 = (struct batadv_unicast_frag_packet *)frag_skb->data;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000259
Sven Eckelmann704509b2011-05-14 23:14:54 +0200260 memcpy(frag1, &tmp_uc, sizeof(tmp_uc));
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000261
Sven Eckelmann76543d12011-11-20 15:47:38 +0100262 frag1->header.ttl--;
Sven Eckelmann7e071c72012-06-03 22:19:13 +0200263 frag1->header.version = BATADV_COMPAT_VERSION;
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200264 frag1->header.packet_type = BATADV_UNICAST_FRAG;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000265
Marek Lindner32ae9b22011-04-20 15:40:58 +0200266 memcpy(frag1->orig, primary_if->net_dev->dev_addr, ETH_ALEN);
Sven Eckelmann704509b2011-05-14 23:14:54 +0200267 memcpy(frag2, frag1, sizeof(*frag2));
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000268
Sven Eckelmannae361ce2011-01-25 22:02:31 +0000269 if (data_len & 1)
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200270 large_tail = BATADV_UNI_FRAG_LARGETAIL;
Sven Eckelmannae361ce2011-01-25 22:02:31 +0000271
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200272 frag1->flags = BATADV_UNI_FRAG_HEAD | large_tail;
Sven Eckelmannae361ce2011-01-25 22:02:31 +0000273 frag2->flags = large_tail;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000274
Marek Lindnere6c10f42011-02-18 12:33:20 +0000275 seqno = atomic_add_return(2, &hard_iface->frag_seqno);
Sven Eckelmannc2f7f0e2011-02-10 14:33:56 +0000276 frag1->seqno = htons(seqno - 1);
277 frag2->seqno = htons(seqno);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000278
Sven Eckelmann9455e342012-05-12 02:09:37 +0200279 batadv_send_skb_packet(skb, hard_iface, dstaddr);
280 batadv_send_skb_packet(frag_skb, hard_iface, dstaddr);
Marek Lindner32ae9b22011-04-20 15:40:58 +0200281 ret = NET_RX_SUCCESS;
282 goto out;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000283
284drop_frag:
285 kfree_skb(frag_skb);
286dropped:
287 kfree_skb(skb);
Marek Lindner32ae9b22011-04-20 15:40:58 +0200288out:
289 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +0200290 batadv_hardif_free_ref(primary_if);
Marek Lindner32ae9b22011-04-20 15:40:58 +0200291 return ret;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000292}
293
Antonio Quartulli7cdcf6d2012-10-01 09:57:35 +0200294/**
295 * batadv_unicast_push_and_fill_skb - extends the buffer and initializes the
296 * common fields for unicast packets
297 * @skb: packet
298 * @hdr_size: amount of bytes to push at the beginning of the skb
299 * @orig_node: the destination node
300 *
301 * Returns false if the buffer extension was not possible or true otherwise
302 */
303static bool batadv_unicast_push_and_fill_skb(struct sk_buff *skb, int hdr_size,
304 struct batadv_orig_node *orig_node)
305{
306 struct batadv_unicast_packet *unicast_packet;
307 uint8_t ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn);
308
309 if (batadv_skb_head_push(skb, hdr_size) < 0)
310 return false;
311
312 unicast_packet = (struct batadv_unicast_packet *)skb->data;
313 unicast_packet->header.version = BATADV_COMPAT_VERSION;
314 /* batman packet type: unicast */
315 unicast_packet->header.packet_type = BATADV_UNICAST;
316 /* set unicast ttl */
317 unicast_packet->header.ttl = BATADV_TTL;
318 /* copy the destination for faster routing */
319 memcpy(unicast_packet->dest, orig_node->orig, ETH_ALEN);
320 /* set the destination tt version number */
321 unicast_packet->ttvn = ttvn;
322
323 return true;
324}
325
326/**
327 * batadv_unicast_prepare_skb - encapsulate an skb with a unicast header
328 * @skb: the skb containing the payload to encapsulate
329 * @orig_node: the destination node
330 *
331 * Returns false if the payload could not be encapsulated or true otherwise
332 */
333static bool batadv_unicast_prepare_skb(struct sk_buff *skb,
334 struct batadv_orig_node *orig_node)
335{
336 size_t uni_size = sizeof(struct batadv_unicast_packet);
337 return batadv_unicast_push_and_fill_skb(skb, uni_size, orig_node);
338}
339
340/**
341 * batadv_unicast_4addr_prepare_skb - encapsulate an skb with a unicast4addr
342 * header
343 * @bat_priv: the bat priv with all the soft interface information
344 * @skb: the skb containing the payload to encapsulate
345 * @orig_node: the destination node
346 * @packet_subtype: the batman 4addr packet subtype to use
347 *
348 * Returns false if the payload could not be encapsulated or true otherwise
349 */
Antonio Quartulli785ea112011-11-23 11:35:44 +0100350bool batadv_unicast_4addr_prepare_skb(struct batadv_priv *bat_priv,
351 struct sk_buff *skb,
352 struct batadv_orig_node *orig,
353 int packet_subtype)
Antonio Quartulli7cdcf6d2012-10-01 09:57:35 +0200354{
355 struct batadv_hard_iface *primary_if;
356 struct batadv_unicast_4addr_packet *unicast_4addr_packet;
357 bool ret = false;
358
359 primary_if = batadv_primary_if_get_selected(bat_priv);
360 if (!primary_if)
361 goto out;
362
363 /* pull the header space and fill the unicast_packet substructure.
364 * We can do that because the first member of the unicast_4addr_packet
365 * is of type struct unicast_packet
366 */
367 if (!batadv_unicast_push_and_fill_skb(skb,
368 sizeof(*unicast_4addr_packet),
369 orig))
370 goto out;
371
372 unicast_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data;
373 unicast_4addr_packet->u.header.packet_type = BATADV_UNICAST_4ADDR;
374 memcpy(unicast_4addr_packet->src, primary_if->net_dev->dev_addr,
375 ETH_ALEN);
376 unicast_4addr_packet->subtype = packet_subtype;
377 unicast_4addr_packet->reserved = 0;
378
379 ret = true;
380out:
381 if (primary_if)
382 batadv_hardif_free_ref(primary_if);
383 return ret;
384}
385
386/**
387 * batadv_unicast_generic_send_skb - send an skb as unicast
388 * @bat_priv: the bat priv with all the soft interface information
389 * @skb: payload to send
390 * @packet_type: the batman unicast packet type to use
391 * @packet_subtype: the batman packet subtype. It is ignored if packet_type is
392 * not BATADV_UNICAT_4ADDR
393 *
394 * Returns 1 in case of error or 0 otherwise
395 */
396int batadv_unicast_generic_send_skb(struct batadv_priv *bat_priv,
397 struct sk_buff *skb, int packet_type,
398 int packet_subtype)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000399{
400 struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
Sven Eckelmann96412692012-06-05 22:31:30 +0200401 struct batadv_unicast_packet *unicast_packet;
Sven Eckelmann56303d32012-06-05 22:31:31 +0200402 struct batadv_orig_node *orig_node;
403 struct batadv_neigh_node *neigh_node;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000404 int data_len = skb->len;
Martin Hundebøllbb351ba2012-10-16 16:13:48 +0200405 int ret = NET_RX_DROP;
Sven Eckelmann0aca2362012-06-19 20:26:30 +0200406 unsigned int dev_mtu;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000407
408 /* get routing information */
Linus Lüssing43c70ad2011-02-13 21:13:04 +0000409 if (is_multicast_ether_addr(ethhdr->h_dest)) {
Sven Eckelmann7cf06bc2012-05-12 02:09:29 +0200410 orig_node = batadv_gw_get_selected_orig(bat_priv);
Linus Lüssing43c70ad2011-02-13 21:13:04 +0000411 if (orig_node)
Marek Lindner44524fc2011-02-10 14:33:53 +0000412 goto find_router;
413 }
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000414
Antonio Quartulli3d393e42011-07-07 15:35:37 +0200415 /* check for tt host - increases orig_node refcount.
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200416 * returns NULL in case of AP isolation
417 */
Sven Eckelmann08c36d32012-05-12 02:09:39 +0200418 orig_node = batadv_transtable_search(bat_priv, ethhdr->h_source,
419 ethhdr->h_dest);
Sven Eckelmann56303d32012-06-05 22:31:31 +0200420
Marek Lindner44524fc2011-02-10 14:33:53 +0000421find_router:
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200422 /* find_router():
Marek Lindnerd0072602011-01-19 20:01:44 +0000423 * - if orig_node is NULL it returns NULL
424 * - increases neigh_nodes refcount if found.
425 */
Sven Eckelmann30d3c512012-05-12 02:09:36 +0200426 neigh_node = batadv_find_router(bat_priv, orig_node, NULL);
Sven Eckelmann56303d32012-06-05 22:31:31 +0200427
Marek Lindner44524fc2011-02-10 14:33:53 +0000428 if (!neigh_node)
Marek Lindnerd0072602011-01-19 20:01:44 +0000429 goto out;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000430
Antonio Quartulli7cdcf6d2012-10-01 09:57:35 +0200431 switch (packet_type) {
432 case BATADV_UNICAST:
433 batadv_unicast_prepare_skb(skb, orig_node);
434 break;
435 case BATADV_UNICAST_4ADDR:
436 batadv_unicast_4addr_prepare_skb(bat_priv, skb, orig_node,
437 packet_subtype);
438 break;
439 default:
440 /* this function supports UNICAST and UNICAST_4ADDR only. It
441 * should never be invoked with any other packet type
442 */
Marek Lindnerd0072602011-01-19 20:01:44 +0000443 goto out;
Antonio Quartulli7cdcf6d2012-10-01 09:57:35 +0200444 }
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000445
Sven Eckelmann96412692012-06-05 22:31:30 +0200446 unicast_packet = (struct batadv_unicast_packet *)skb->data;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000447
Antonio Quartulli3275e7c2012-03-16 18:03:28 +0100448 /* inform the destination node that we are still missing a correct route
449 * for this client. The destination will receive this packet and will
450 * try to reroute it because the ttvn contained in the header is less
451 * than the current one
452 */
Sven Eckelmann08c36d32012-05-12 02:09:39 +0200453 if (batadv_tt_global_client_is_roaming(bat_priv, ethhdr->h_dest))
Antonio Quartulli3275e7c2012-03-16 18:03:28 +0100454 unicast_packet->ttvn = unicast_packet->ttvn - 1;
455
Sven Eckelmann0aca2362012-06-19 20:26:30 +0200456 dev_mtu = neigh_node->if_incoming->net_dev->mtu;
Antonio Quartulli7cdcf6d2012-10-01 09:57:35 +0200457 /* fragmentation mechanism only works for UNICAST (now) */
458 if (packet_type == BATADV_UNICAST &&
459 atomic_read(&bat_priv->fragmentation) &&
Sven Eckelmann0aca2362012-06-19 20:26:30 +0200460 data_len + sizeof(*unicast_packet) > dev_mtu) {
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000461 /* send frag skb decreases ttl */
Sven Eckelmann76543d12011-11-20 15:47:38 +0100462 unicast_packet->header.ttl++;
Sven Eckelmann88ed1e772012-05-12 02:09:40 +0200463 ret = batadv_frag_send_skb(skb, bat_priv,
464 neigh_node->if_incoming,
465 neigh_node->addr);
Marek Lindner44524fc2011-02-10 14:33:53 +0000466 goto out;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000467 }
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000468
Martin Hundebøllbb351ba2012-10-16 16:13:48 +0200469 if (batadv_send_skb_to_orig(skb, orig_node, NULL))
470 ret = 0;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000471
Marek Lindner44524fc2011-02-10 14:33:53 +0000472out:
473 if (neigh_node)
Sven Eckelmann7d211ef2012-05-12 02:09:34 +0200474 batadv_neigh_node_free_ref(neigh_node);
Marek Lindner44524fc2011-02-10 14:33:53 +0000475 if (orig_node)
Sven Eckelmann7d211ef2012-05-12 02:09:34 +0200476 batadv_orig_node_free_ref(orig_node);
Martin Hundebøllbb351ba2012-10-16 16:13:48 +0200477 if (ret == NET_RX_DROP)
Marek Lindner44524fc2011-02-10 14:33:53 +0000478 kfree_skb(skb);
479 return ret;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000480}