blob: 071f288b77a86c8c88b6eadd9634a24cdb209e81 [file] [log] [blame]
Antonio Quartulli0b873932013-01-04 03:05:31 +01001/* Copyright (C) 2007-2013 B.A.T.M.A.N. contributors:
Marek Lindnerfc957272011-07-30 12:04:12 +02002 *
3 * Marek Lindner, Simon Wunderlich
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
Marek Lindnerfc957272011-07-30 12:04:12 +020018 */
19
20#include "main.h"
Marek Lindnerfc957272011-07-30 12:04:12 +020021#include "translation-table.h"
22#include "ring_buffer.h"
23#include "originator.h"
24#include "routing.h"
25#include "gateway_common.h"
26#include "gateway_client.h"
27#include "hard-interface.h"
28#include "send.h"
Marek Lindner1c280472011-11-28 17:40:17 +080029#include "bat_algo.h"
Martin Hundebølld56b1702013-01-25 11:12:39 +010030#include "network-coding.h"
Marek Lindnerfc957272011-07-30 12:04:12 +020031
Sven Eckelmann56303d32012-06-05 22:31:31 +020032static struct batadv_neigh_node *
33batadv_iv_ogm_neigh_new(struct batadv_hard_iface *hard_iface,
34 const uint8_t *neigh_addr,
35 struct batadv_orig_node *orig_node,
36 struct batadv_orig_node *orig_neigh, __be32 seqno)
Marek Lindner7ae8b282012-03-01 15:35:21 +080037{
Sven Eckelmann56303d32012-06-05 22:31:31 +020038 struct batadv_neigh_node *neigh_node;
Marek Lindner7ae8b282012-03-01 15:35:21 +080039
Al Viroe0f52112012-04-22 07:46:29 +010040 neigh_node = batadv_neigh_node_new(hard_iface, neigh_addr,
41 ntohl(seqno));
Marek Lindner7ae8b282012-03-01 15:35:21 +080042 if (!neigh_node)
43 goto out;
44
45 INIT_LIST_HEAD(&neigh_node->bonding_list);
Marek Lindner7ae8b282012-03-01 15:35:21 +080046
47 neigh_node->orig_node = orig_neigh;
48 neigh_node->if_incoming = hard_iface;
49
50 spin_lock_bh(&orig_node->neigh_list_lock);
51 hlist_add_head_rcu(&neigh_node->list, &orig_node->neigh_list);
52 spin_unlock_bh(&orig_node->neigh_list_lock);
53
54out:
55 return neigh_node;
56}
57
Sven Eckelmann56303d32012-06-05 22:31:31 +020058static int batadv_iv_ogm_iface_enable(struct batadv_hard_iface *hard_iface)
Marek Lindnerd0b9fd82011-07-30 12:33:33 +020059{
Sven Eckelmann96412692012-06-05 22:31:30 +020060 struct batadv_ogm_packet *batadv_ogm_packet;
Marek Lindner14511512012-08-02 17:20:26 +020061 unsigned char *ogm_buff;
Marek Lindnerd7d32ec2012-02-07 17:20:46 +080062 uint32_t random_seqno;
Sven Eckelmann5346c352012-05-05 13:27:28 +020063 int res = -ENOMEM;
Marek Lindnerd7d32ec2012-02-07 17:20:46 +080064
65 /* randomize initial seqno to avoid collision */
66 get_random_bytes(&random_seqno, sizeof(random_seqno));
Marek Lindner14511512012-08-02 17:20:26 +020067 atomic_set(&hard_iface->bat_iv.ogm_seqno, random_seqno);
Marek Lindnerd0b9fd82011-07-30 12:33:33 +020068
Marek Lindner14511512012-08-02 17:20:26 +020069 hard_iface->bat_iv.ogm_buff_len = BATADV_OGM_HLEN;
70 ogm_buff = kmalloc(hard_iface->bat_iv.ogm_buff_len, GFP_ATOMIC);
71 if (!ogm_buff)
Marek Lindner77af7572012-02-07 17:20:48 +080072 goto out;
73
Marek Lindner14511512012-08-02 17:20:26 +020074 hard_iface->bat_iv.ogm_buff = ogm_buff;
75
76 batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
Sven Eckelmann96412692012-06-05 22:31:30 +020077 batadv_ogm_packet->header.packet_type = BATADV_IV_OGM;
78 batadv_ogm_packet->header.version = BATADV_COMPAT_VERSION;
79 batadv_ogm_packet->header.ttl = 2;
80 batadv_ogm_packet->flags = BATADV_NO_FLAGS;
81 batadv_ogm_packet->tq = BATADV_TQ_MAX_VALUE;
82 batadv_ogm_packet->tt_num_changes = 0;
83 batadv_ogm_packet->ttvn = 0;
Marek Lindner77af7572012-02-07 17:20:48 +080084
85 res = 0;
86
87out:
88 return res;
Marek Lindnerd0b9fd82011-07-30 12:33:33 +020089}
90
Sven Eckelmann56303d32012-06-05 22:31:31 +020091static void batadv_iv_ogm_iface_disable(struct batadv_hard_iface *hard_iface)
Marek Lindner00a50072012-02-07 17:20:47 +080092{
Marek Lindner14511512012-08-02 17:20:26 +020093 kfree(hard_iface->bat_iv.ogm_buff);
94 hard_iface->bat_iv.ogm_buff = NULL;
Marek Lindner00a50072012-02-07 17:20:47 +080095}
96
Sven Eckelmann56303d32012-06-05 22:31:31 +020097static void batadv_iv_ogm_iface_update_mac(struct batadv_hard_iface *hard_iface)
Marek Lindnerd0b9fd82011-07-30 12:33:33 +020098{
Sven Eckelmann96412692012-06-05 22:31:30 +020099 struct batadv_ogm_packet *batadv_ogm_packet;
Marek Lindner14511512012-08-02 17:20:26 +0200100 unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff;
Marek Lindnerd0b9fd82011-07-30 12:33:33 +0200101
Marek Lindner14511512012-08-02 17:20:26 +0200102 batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
Sven Eckelmann96412692012-06-05 22:31:30 +0200103 memcpy(batadv_ogm_packet->orig,
Marek Lindnerd0b9fd82011-07-30 12:33:33 +0200104 hard_iface->net_dev->dev_addr, ETH_ALEN);
Sven Eckelmann96412692012-06-05 22:31:30 +0200105 memcpy(batadv_ogm_packet->prev_sender,
Marek Lindnerd0b9fd82011-07-30 12:33:33 +0200106 hard_iface->net_dev->dev_addr, ETH_ALEN);
107}
108
Sven Eckelmann56303d32012-06-05 22:31:31 +0200109static void
110batadv_iv_ogm_primary_iface_set(struct batadv_hard_iface *hard_iface)
Marek Lindnerc3229392012-03-11 06:17:50 +0800111{
Sven Eckelmann96412692012-06-05 22:31:30 +0200112 struct batadv_ogm_packet *batadv_ogm_packet;
Marek Lindner14511512012-08-02 17:20:26 +0200113 unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff;
Marek Lindnerc3229392012-03-11 06:17:50 +0800114
Marek Lindner14511512012-08-02 17:20:26 +0200115 batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
Sven Eckelmann96412692012-06-05 22:31:30 +0200116 batadv_ogm_packet->flags = BATADV_PRIMARIES_FIRST_HOP;
117 batadv_ogm_packet->header.ttl = BATADV_TTL;
Marek Lindnerc3229392012-03-11 06:17:50 +0800118}
119
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200120/* when do we schedule our own ogm to be sent */
Sven Eckelmannfe8bc392012-05-12 18:33:51 +0200121static unsigned long
Sven Eckelmann56303d32012-06-05 22:31:31 +0200122batadv_iv_ogm_emit_send_time(const struct batadv_priv *bat_priv)
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200123{
Sven Eckelmann42d0b042012-06-03 22:19:17 +0200124 unsigned int msecs;
125
126 msecs = atomic_read(&bat_priv->orig_interval) - BATADV_JITTER;
Akinobu Mitae76e4322012-12-24 11:14:07 +0900127 msecs += prandom_u32() % (2 * BATADV_JITTER);
Sven Eckelmann42d0b042012-06-03 22:19:17 +0200128
129 return jiffies + msecs_to_jiffies(msecs);
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200130}
131
132/* when do we schedule a ogm packet to be sent */
Sven Eckelmannfe8bc392012-05-12 18:33:51 +0200133static unsigned long batadv_iv_ogm_fwd_send_time(void)
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200134{
Akinobu Mitae76e4322012-12-24 11:14:07 +0900135 return jiffies + msecs_to_jiffies(prandom_u32() % (BATADV_JITTER / 2));
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200136}
137
138/* apply hop penalty for a normal link */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200139static uint8_t batadv_hop_penalty(uint8_t tq,
140 const struct batadv_priv *bat_priv)
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200141{
142 int hop_penalty = atomic_read(&bat_priv->hop_penalty);
Sven Eckelmann42d0b042012-06-03 22:19:17 +0200143 int new_tq;
144
145 new_tq = tq * (BATADV_TQ_MAX_VALUE - hop_penalty);
146 new_tq /= BATADV_TQ_MAX_VALUE;
147
148 return new_tq;
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200149}
150
Marek Lindnerfc957272011-07-30 12:04:12 +0200151/* is there another aggregated packet here? */
Sven Eckelmannfe8bc392012-05-12 18:33:51 +0200152static int batadv_iv_ogm_aggr_packet(int buff_pos, int packet_len,
153 int tt_num_changes)
Marek Lindnerfc957272011-07-30 12:04:12 +0200154{
Sven Eckelmann08c36d32012-05-12 02:09:39 +0200155 int next_buff_pos = 0;
156
Sven Eckelmann7e071c72012-06-03 22:19:13 +0200157 next_buff_pos += buff_pos + BATADV_OGM_HLEN;
Sven Eckelmann08c36d32012-05-12 02:09:39 +0200158 next_buff_pos += batadv_tt_len(tt_num_changes);
Marek Lindnerfc957272011-07-30 12:04:12 +0200159
160 return (next_buff_pos <= packet_len) &&
Sven Eckelmann42d0b042012-06-03 22:19:17 +0200161 (next_buff_pos <= BATADV_MAX_AGGREGATION_BYTES);
Marek Lindnerfc957272011-07-30 12:04:12 +0200162}
163
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200164/* send a batman ogm to a given interface */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200165static void batadv_iv_ogm_send_to_if(struct batadv_forw_packet *forw_packet,
166 struct batadv_hard_iface *hard_iface)
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200167{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200168 struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200169 char *fwd_str;
170 uint8_t packet_num;
171 int16_t buff_pos;
Sven Eckelmann96412692012-06-05 22:31:30 +0200172 struct batadv_ogm_packet *batadv_ogm_packet;
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200173 struct sk_buff *skb;
Sven Eckelmannc67893d2012-07-08 18:33:51 +0200174 uint8_t *packet_pos;
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200175
Sven Eckelmanne9a4f292012-06-03 22:19:19 +0200176 if (hard_iface->if_status != BATADV_IF_ACTIVE)
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200177 return;
178
179 packet_num = 0;
180 buff_pos = 0;
Sven Eckelmannc67893d2012-07-08 18:33:51 +0200181 packet_pos = forw_packet->skb->data;
182 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200183
184 /* adjust all flags and log packets */
Sven Eckelmannfe8bc392012-05-12 18:33:51 +0200185 while (batadv_iv_ogm_aggr_packet(buff_pos, forw_packet->packet_len,
Sven Eckelmann96412692012-06-05 22:31:30 +0200186 batadv_ogm_packet->tt_num_changes)) {
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200187 /* we might have aggregated direct link packets with an
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200188 * ordinary base packet
189 */
Sven Eckelmann8de47de2012-07-08 16:32:09 +0200190 if (forw_packet->direct_link_flags & BIT(packet_num) &&
191 forw_packet->if_incoming == hard_iface)
Sven Eckelmann96412692012-06-05 22:31:30 +0200192 batadv_ogm_packet->flags |= BATADV_DIRECTLINK;
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200193 else
Sven Eckelmann96412692012-06-05 22:31:30 +0200194 batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK;
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200195
Sven Eckelmannc67893d2012-07-08 18:33:51 +0200196 if (packet_num > 0 || !forw_packet->own)
197 fwd_str = "Forwarding";
198 else
199 fwd_str = "Sending own";
200
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200201 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200202 "%s %spacket (originator %pM, seqno %u, TQ %d, TTL %d, IDF %s, ttvn %d) on interface %s [%pM]\n",
203 fwd_str, (packet_num > 0 ? "aggregated " : ""),
Sven Eckelmann96412692012-06-05 22:31:30 +0200204 batadv_ogm_packet->orig,
205 ntohl(batadv_ogm_packet->seqno),
206 batadv_ogm_packet->tq, batadv_ogm_packet->header.ttl,
207 (batadv_ogm_packet->flags & BATADV_DIRECTLINK ?
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200208 "on" : "off"),
Sven Eckelmann96412692012-06-05 22:31:30 +0200209 batadv_ogm_packet->ttvn, hard_iface->net_dev->name,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200210 hard_iface->net_dev->dev_addr);
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200211
Sven Eckelmann7e071c72012-06-03 22:19:13 +0200212 buff_pos += BATADV_OGM_HLEN;
Sven Eckelmann96412692012-06-05 22:31:30 +0200213 buff_pos += batadv_tt_len(batadv_ogm_packet->tt_num_changes);
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200214 packet_num++;
Sven Eckelmannc67893d2012-07-08 18:33:51 +0200215 packet_pos = forw_packet->skb->data + buff_pos;
216 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200217 }
218
219 /* create clone because function is called more than once */
220 skb = skb_clone(forw_packet->skb, GFP_ATOMIC);
Martin Hundebøllf8214862012-04-20 17:02:45 +0200221 if (skb) {
Sven Eckelmannd69909d2012-06-03 22:19:20 +0200222 batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_TX);
223 batadv_add_counter(bat_priv, BATADV_CNT_MGMT_TX_BYTES,
Martin Hundebøllf8214862012-04-20 17:02:45 +0200224 skb->len + ETH_HLEN);
Sven Eckelmann3193e8f2012-05-12 02:09:42 +0200225 batadv_send_skb_packet(skb, hard_iface, batadv_broadcast_addr);
Martin Hundebøllf8214862012-04-20 17:02:45 +0200226 }
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200227}
228
229/* send a batman ogm packet */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200230static void batadv_iv_ogm_emit(struct batadv_forw_packet *forw_packet)
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200231{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200232 struct batadv_hard_iface *hard_iface;
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200233 struct net_device *soft_iface;
Sven Eckelmann56303d32012-06-05 22:31:31 +0200234 struct batadv_priv *bat_priv;
235 struct batadv_hard_iface *primary_if = NULL;
Sven Eckelmann96412692012-06-05 22:31:30 +0200236 struct batadv_ogm_packet *batadv_ogm_packet;
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200237 unsigned char directlink;
Sven Eckelmannc67893d2012-07-08 18:33:51 +0200238 uint8_t *packet_pos;
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200239
Sven Eckelmannc67893d2012-07-08 18:33:51 +0200240 packet_pos = forw_packet->skb->data;
241 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
Sven Eckelmann96412692012-06-05 22:31:30 +0200242 directlink = (batadv_ogm_packet->flags & BATADV_DIRECTLINK ? 1 : 0);
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200243
244 if (!forw_packet->if_incoming) {
Sven Eckelmann86ceb362012-03-07 09:07:45 +0100245 pr_err("Error - can't forward packet: incoming iface not specified\n");
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200246 goto out;
247 }
248
249 soft_iface = forw_packet->if_incoming->soft_iface;
250 bat_priv = netdev_priv(soft_iface);
251
Sven Eckelmanne9a4f292012-06-03 22:19:19 +0200252 if (forw_packet->if_incoming->if_status != BATADV_IF_ACTIVE)
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200253 goto out;
254
Sven Eckelmanne5d89252012-05-12 13:48:54 +0200255 primary_if = batadv_primary_if_get_selected(bat_priv);
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200256 if (!primary_if)
257 goto out;
258
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200259 /* multihomed peer assumed
260 * non-primary OGMs are only broadcasted on their interface
261 */
Sven Eckelmann96412692012-06-05 22:31:30 +0200262 if ((directlink && (batadv_ogm_packet->header.ttl == 1)) ||
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200263 (forw_packet->own && (forw_packet->if_incoming != primary_if))) {
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200264 /* FIXME: what about aggregated packets ? */
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200265 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200266 "%s packet (originator %pM, seqno %u, TTL %d) on interface %s [%pM]\n",
267 (forw_packet->own ? "Sending own" : "Forwarding"),
Sven Eckelmann96412692012-06-05 22:31:30 +0200268 batadv_ogm_packet->orig,
269 ntohl(batadv_ogm_packet->seqno),
270 batadv_ogm_packet->header.ttl,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200271 forw_packet->if_incoming->net_dev->name,
272 forw_packet->if_incoming->net_dev->dev_addr);
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200273
274 /* skb is only used once and than forw_packet is free'd */
Sven Eckelmann9455e342012-05-12 02:09:37 +0200275 batadv_send_skb_packet(forw_packet->skb,
276 forw_packet->if_incoming,
Sven Eckelmann3193e8f2012-05-12 02:09:42 +0200277 batadv_broadcast_addr);
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200278 forw_packet->skb = NULL;
279
280 goto out;
281 }
282
283 /* broadcast on every interface */
284 rcu_read_lock();
Sven Eckelmann3193e8f2012-05-12 02:09:42 +0200285 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200286 if (hard_iface->soft_iface != soft_iface)
287 continue;
288
Sven Eckelmannfe8bc392012-05-12 18:33:51 +0200289 batadv_iv_ogm_send_to_if(forw_packet, hard_iface);
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200290 }
291 rcu_read_unlock();
292
293out:
294 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +0200295 batadv_hardif_free_ref(primary_if);
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200296}
297
298/* return true if new_packet can be aggregated with forw_packet */
Sven Eckelmannfe8bc392012-05-12 18:33:51 +0200299static bool
Sven Eckelmann96412692012-06-05 22:31:30 +0200300batadv_iv_ogm_can_aggregate(const struct batadv_ogm_packet *new_bat_ogm_packet,
Sven Eckelmann56303d32012-06-05 22:31:31 +0200301 struct batadv_priv *bat_priv,
Sven Eckelmannfe8bc392012-05-12 18:33:51 +0200302 int packet_len, unsigned long send_time,
303 bool directlink,
Sven Eckelmann56303d32012-06-05 22:31:31 +0200304 const struct batadv_hard_iface *if_incoming,
305 const struct batadv_forw_packet *forw_packet)
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200306{
Sven Eckelmann96412692012-06-05 22:31:30 +0200307 struct batadv_ogm_packet *batadv_ogm_packet;
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200308 int aggregated_bytes = forw_packet->packet_len + packet_len;
Sven Eckelmann56303d32012-06-05 22:31:31 +0200309 struct batadv_hard_iface *primary_if = NULL;
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200310 bool res = false;
Sven Eckelmann42d0b042012-06-03 22:19:17 +0200311 unsigned long aggregation_end_time;
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200312
Sven Eckelmann96412692012-06-05 22:31:30 +0200313 batadv_ogm_packet = (struct batadv_ogm_packet *)forw_packet->skb->data;
Sven Eckelmann42d0b042012-06-03 22:19:17 +0200314 aggregation_end_time = send_time;
315 aggregation_end_time += msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS);
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200316
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200317 /* we can aggregate the current packet to this aggregated packet
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200318 * if:
319 *
320 * - the send time is within our MAX_AGGREGATION_MS time
321 * - the resulting packet wont be bigger than
322 * MAX_AGGREGATION_BYTES
323 */
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200324 if (time_before(send_time, forw_packet->send_time) &&
Sven Eckelmann42d0b042012-06-03 22:19:17 +0200325 time_after_eq(aggregation_end_time, forw_packet->send_time) &&
326 (aggregated_bytes <= BATADV_MAX_AGGREGATION_BYTES)) {
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200327 /* check aggregation compatibility
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200328 * -> direct link packets are broadcasted on
329 * their interface only
330 * -> aggregate packet if the current packet is
331 * a "global" packet as well as the base
332 * packet
333 */
Sven Eckelmanne5d89252012-05-12 13:48:54 +0200334 primary_if = batadv_primary_if_get_selected(bat_priv);
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200335 if (!primary_if)
336 goto out;
337
338 /* packets without direct link flag and high TTL
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200339 * are flooded through the net
340 */
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200341 if ((!directlink) &&
Sven Eckelmann96412692012-06-05 22:31:30 +0200342 (!(batadv_ogm_packet->flags & BATADV_DIRECTLINK)) &&
343 (batadv_ogm_packet->header.ttl != 1) &&
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200344
345 /* own packets originating non-primary
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200346 * interfaces leave only that interface
347 */
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200348 ((!forw_packet->own) ||
349 (forw_packet->if_incoming == primary_if))) {
350 res = true;
351 goto out;
352 }
353
354 /* if the incoming packet is sent via this one
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200355 * interface only - we still can aggregate
356 */
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200357 if ((directlink) &&
Sven Eckelmannfe8bc392012-05-12 18:33:51 +0200358 (new_bat_ogm_packet->header.ttl == 1) &&
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200359 (forw_packet->if_incoming == if_incoming) &&
360
361 /* packets from direct neighbors or
362 * own secondary interface packets
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200363 * (= secondary interface packets in general)
364 */
Sven Eckelmann96412692012-06-05 22:31:30 +0200365 (batadv_ogm_packet->flags & BATADV_DIRECTLINK ||
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200366 (forw_packet->own &&
367 forw_packet->if_incoming != primary_if))) {
368 res = true;
369 goto out;
370 }
371 }
372
373out:
374 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +0200375 batadv_hardif_free_ref(primary_if);
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200376 return res;
377}
378
379/* create a new aggregated packet and add this packet to it */
Sven Eckelmannfe8bc392012-05-12 18:33:51 +0200380static void batadv_iv_ogm_aggregate_new(const unsigned char *packet_buff,
381 int packet_len, unsigned long send_time,
382 bool direct_link,
Sven Eckelmann56303d32012-06-05 22:31:31 +0200383 struct batadv_hard_iface *if_incoming,
Sven Eckelmannfe8bc392012-05-12 18:33:51 +0200384 int own_packet)
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200385{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200386 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
387 struct batadv_forw_packet *forw_packet_aggr;
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200388 unsigned char *skb_buff;
Sven Eckelmann42d0b042012-06-03 22:19:17 +0200389 unsigned int skb_size;
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200390
391 if (!atomic_inc_not_zero(&if_incoming->refcount))
392 return;
393
394 /* own packet should always be scheduled */
395 if (!own_packet) {
Sven Eckelmann3e348192012-05-16 20:23:22 +0200396 if (!batadv_atomic_dec_not_zero(&bat_priv->batman_queue_left)) {
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200397 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200398 "batman packet queue full\n");
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200399 goto out;
400 }
401 }
402
403 forw_packet_aggr = kmalloc(sizeof(*forw_packet_aggr), GFP_ATOMIC);
404 if (!forw_packet_aggr) {
405 if (!own_packet)
406 atomic_inc(&bat_priv->batman_queue_left);
407 goto out;
408 }
409
410 if ((atomic_read(&bat_priv->aggregated_ogms)) &&
Sven Eckelmann42d0b042012-06-03 22:19:17 +0200411 (packet_len < BATADV_MAX_AGGREGATION_BYTES))
Sven Eckelmann5b246572012-11-04 17:11:45 +0100412 skb_size = BATADV_MAX_AGGREGATION_BYTES;
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200413 else
Sven Eckelmann5b246572012-11-04 17:11:45 +0100414 skb_size = packet_len;
415
416 skb_size += ETH_HLEN + NET_IP_ALIGN;
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200417
Sven Eckelmann42d0b042012-06-03 22:19:17 +0200418 forw_packet_aggr->skb = dev_alloc_skb(skb_size);
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200419 if (!forw_packet_aggr->skb) {
420 if (!own_packet)
421 atomic_inc(&bat_priv->batman_queue_left);
422 kfree(forw_packet_aggr);
423 goto out;
424 }
Sven Eckelmann5b246572012-11-04 17:11:45 +0100425 skb_reserve(forw_packet_aggr->skb, ETH_HLEN + NET_IP_ALIGN);
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200426
427 INIT_HLIST_NODE(&forw_packet_aggr->list);
428
429 skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
430 forw_packet_aggr->packet_len = packet_len;
431 memcpy(skb_buff, packet_buff, packet_len);
432
433 forw_packet_aggr->own = own_packet;
434 forw_packet_aggr->if_incoming = if_incoming;
435 forw_packet_aggr->num_packets = 0;
Sven Eckelmann42d0b042012-06-03 22:19:17 +0200436 forw_packet_aggr->direct_link_flags = BATADV_NO_FLAGS;
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200437 forw_packet_aggr->send_time = send_time;
438
439 /* save packet direct link flag status */
440 if (direct_link)
441 forw_packet_aggr->direct_link_flags |= 1;
442
443 /* add new packet to packet list */
444 spin_lock_bh(&bat_priv->forw_bat_list_lock);
445 hlist_add_head(&forw_packet_aggr->list, &bat_priv->forw_bat_list);
446 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
447
448 /* start timer for this packet */
449 INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work,
Sven Eckelmann9455e342012-05-12 02:09:37 +0200450 batadv_send_outstanding_bat_ogm_packet);
Sven Eckelmann3193e8f2012-05-12 02:09:42 +0200451 queue_delayed_work(batadv_event_workqueue,
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200452 &forw_packet_aggr->delayed_work,
453 send_time - jiffies);
454
455 return;
456out:
Sven Eckelmanne5d89252012-05-12 13:48:54 +0200457 batadv_hardif_free_ref(if_incoming);
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200458}
459
460/* aggregate a new packet into the existing ogm packet */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200461static void batadv_iv_ogm_aggregate(struct batadv_forw_packet *forw_packet_aggr,
Sven Eckelmannfe8bc392012-05-12 18:33:51 +0200462 const unsigned char *packet_buff,
463 int packet_len, bool direct_link)
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200464{
465 unsigned char *skb_buff;
Sven Eckelmann8de47de2012-07-08 16:32:09 +0200466 unsigned long new_direct_link_flag;
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200467
468 skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
469 memcpy(skb_buff, packet_buff, packet_len);
470 forw_packet_aggr->packet_len += packet_len;
471 forw_packet_aggr->num_packets++;
472
473 /* save packet direct link flag status */
Sven Eckelmann8de47de2012-07-08 16:32:09 +0200474 if (direct_link) {
475 new_direct_link_flag = BIT(forw_packet_aggr->num_packets);
476 forw_packet_aggr->direct_link_flags |= new_direct_link_flag;
477 }
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200478}
479
Sven Eckelmann56303d32012-06-05 22:31:31 +0200480static void batadv_iv_ogm_queue_add(struct batadv_priv *bat_priv,
Sven Eckelmannfe8bc392012-05-12 18:33:51 +0200481 unsigned char *packet_buff,
482 int packet_len,
Sven Eckelmann56303d32012-06-05 22:31:31 +0200483 struct batadv_hard_iface *if_incoming,
Sven Eckelmannfe8bc392012-05-12 18:33:51 +0200484 int own_packet, unsigned long send_time)
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200485{
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200486 /* _aggr -> pointer to the packet we want to aggregate with
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200487 * _pos -> pointer to the position in the queue
488 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200489 struct batadv_forw_packet *forw_packet_aggr = NULL;
490 struct batadv_forw_packet *forw_packet_pos = NULL;
Sven Eckelmann96412692012-06-05 22:31:30 +0200491 struct batadv_ogm_packet *batadv_ogm_packet;
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200492 bool direct_link;
Sven Eckelmann42d0b042012-06-03 22:19:17 +0200493 unsigned long max_aggregation_jiffies;
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200494
Sven Eckelmann96412692012-06-05 22:31:30 +0200495 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff;
496 direct_link = batadv_ogm_packet->flags & BATADV_DIRECTLINK ? 1 : 0;
Sven Eckelmann42d0b042012-06-03 22:19:17 +0200497 max_aggregation_jiffies = msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS);
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200498
499 /* find position for the packet in the forward queue */
500 spin_lock_bh(&bat_priv->forw_bat_list_lock);
501 /* own packets are not to be aggregated */
502 if ((atomic_read(&bat_priv->aggregated_ogms)) && (!own_packet)) {
Sasha Levinb67bfe02013-02-27 17:06:00 -0800503 hlist_for_each_entry(forw_packet_pos,
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200504 &bat_priv->forw_bat_list, list) {
Sven Eckelmann96412692012-06-05 22:31:30 +0200505 if (batadv_iv_ogm_can_aggregate(batadv_ogm_packet,
Sven Eckelmannfe8bc392012-05-12 18:33:51 +0200506 bat_priv, packet_len,
507 send_time, direct_link,
508 if_incoming,
509 forw_packet_pos)) {
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200510 forw_packet_aggr = forw_packet_pos;
511 break;
512 }
513 }
514 }
515
516 /* nothing to aggregate with - either aggregation disabled or no
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200517 * suitable aggregation packet found
518 */
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200519 if (!forw_packet_aggr) {
520 /* the following section can run without the lock */
521 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
522
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200523 /* if we could not aggregate this packet with one of the others
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200524 * we hold it back for a while, so that it might be aggregated
525 * later on
526 */
Sven Eckelmann42d0b042012-06-03 22:19:17 +0200527 if (!own_packet && atomic_read(&bat_priv->aggregated_ogms))
528 send_time += max_aggregation_jiffies;
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200529
Sven Eckelmannfe8bc392012-05-12 18:33:51 +0200530 batadv_iv_ogm_aggregate_new(packet_buff, packet_len,
531 send_time, direct_link,
532 if_incoming, own_packet);
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200533 } else {
Sven Eckelmannfe8bc392012-05-12 18:33:51 +0200534 batadv_iv_ogm_aggregate(forw_packet_aggr, packet_buff,
535 packet_len, direct_link);
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200536 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
537 }
538}
539
Sven Eckelmann56303d32012-06-05 22:31:31 +0200540static void batadv_iv_ogm_forward(struct batadv_orig_node *orig_node,
Sven Eckelmannfe8bc392012-05-12 18:33:51 +0200541 const struct ethhdr *ethhdr,
Sven Eckelmann96412692012-06-05 22:31:30 +0200542 struct batadv_ogm_packet *batadv_ogm_packet,
Sven Eckelmannfe8bc392012-05-12 18:33:51 +0200543 bool is_single_hop_neigh,
544 bool is_from_best_next_hop,
Sven Eckelmann56303d32012-06-05 22:31:31 +0200545 struct batadv_hard_iface *if_incoming)
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200546{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200547 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200548 uint8_t tt_num_changes;
549
Sven Eckelmann96412692012-06-05 22:31:30 +0200550 if (batadv_ogm_packet->header.ttl <= 1) {
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200551 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "ttl exceeded\n");
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200552 return;
553 }
554
Marek Lindner13b25412012-03-11 06:17:53 +0800555 if (!is_from_best_next_hop) {
556 /* Mark the forwarded packet when it is not coming from our
557 * best next hop. We still need to forward the packet for our
558 * neighbor link quality detection to work in case the packet
559 * originated from a single hop neighbor. Otherwise we can
560 * simply drop the ogm.
561 */
562 if (is_single_hop_neigh)
Sven Eckelmann96412692012-06-05 22:31:30 +0200563 batadv_ogm_packet->flags |= BATADV_NOT_BEST_NEXT_HOP;
Marek Lindner13b25412012-03-11 06:17:53 +0800564 else
565 return;
566 }
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200567
Sven Eckelmann96412692012-06-05 22:31:30 +0200568 tt_num_changes = batadv_ogm_packet->tt_num_changes;
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200569
Sven Eckelmann96412692012-06-05 22:31:30 +0200570 batadv_ogm_packet->header.ttl--;
571 memcpy(batadv_ogm_packet->prev_sender, ethhdr->h_source, ETH_ALEN);
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200572
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200573 /* apply hop penalty */
Sven Eckelmann96412692012-06-05 22:31:30 +0200574 batadv_ogm_packet->tq = batadv_hop_penalty(batadv_ogm_packet->tq,
Sven Eckelmannfe8bc392012-05-12 18:33:51 +0200575 bat_priv);
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200576
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200577 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200578 "Forwarding packet: tq: %i, ttl: %i\n",
Sven Eckelmann96412692012-06-05 22:31:30 +0200579 batadv_ogm_packet->tq, batadv_ogm_packet->header.ttl);
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200580
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200581 /* switch of primaries first hop flag when forwarding */
Sven Eckelmann96412692012-06-05 22:31:30 +0200582 batadv_ogm_packet->flags &= ~BATADV_PRIMARIES_FIRST_HOP;
Marek Lindner75cd33f2012-03-01 15:35:16 +0800583 if (is_single_hop_neigh)
Sven Eckelmann96412692012-06-05 22:31:30 +0200584 batadv_ogm_packet->flags |= BATADV_DIRECTLINK;
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200585 else
Sven Eckelmann96412692012-06-05 22:31:30 +0200586 batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK;
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200587
Sven Eckelmann96412692012-06-05 22:31:30 +0200588 batadv_iv_ogm_queue_add(bat_priv, (unsigned char *)batadv_ogm_packet,
Sven Eckelmann7e071c72012-06-03 22:19:13 +0200589 BATADV_OGM_HLEN + batadv_tt_len(tt_num_changes),
Sven Eckelmannfe8bc392012-05-12 18:33:51 +0200590 if_incoming, 0, batadv_iv_ogm_fwd_send_time());
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200591}
592
Sven Eckelmann56303d32012-06-05 22:31:31 +0200593static void batadv_iv_ogm_schedule(struct batadv_hard_iface *hard_iface)
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200594{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200595 struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
Marek Lindner14511512012-08-02 17:20:26 +0200596 unsigned char **ogm_buff = &hard_iface->bat_iv.ogm_buff;
Sven Eckelmann96412692012-06-05 22:31:30 +0200597 struct batadv_ogm_packet *batadv_ogm_packet;
Sven Eckelmann56303d32012-06-05 22:31:31 +0200598 struct batadv_hard_iface *primary_if;
Marek Lindner14511512012-08-02 17:20:26 +0200599 int *ogm_buff_len = &hard_iface->bat_iv.ogm_buff_len;
Marek Lindnerbe9aa4c2012-05-07 04:22:05 +0800600 int vis_server, tt_num_changes = 0;
Sven Eckelmannbbb1f902012-07-08 17:13:15 +0200601 uint32_t seqno;
602 uint8_t bandwidth;
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200603
604 vis_server = atomic_read(&bat_priv->vis_mode);
Sven Eckelmanne5d89252012-05-12 13:48:54 +0200605 primary_if = batadv_primary_if_get_selected(bat_priv);
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200606
Marek Lindnerbe9aa4c2012-05-07 04:22:05 +0800607 if (hard_iface == primary_if)
Marek Lindner14511512012-08-02 17:20:26 +0200608 tt_num_changes = batadv_tt_append_diff(bat_priv, ogm_buff,
609 ogm_buff_len,
Sven Eckelmann7e071c72012-06-03 22:19:13 +0200610 BATADV_OGM_HLEN);
Marek Lindnerbe9aa4c2012-05-07 04:22:05 +0800611
Marek Lindner14511512012-08-02 17:20:26 +0200612 batadv_ogm_packet = (struct batadv_ogm_packet *)(*ogm_buff);
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200613
614 /* change sequence number to network order */
Marek Lindner14511512012-08-02 17:20:26 +0200615 seqno = (uint32_t)atomic_read(&hard_iface->bat_iv.ogm_seqno);
Sven Eckelmannbbb1f902012-07-08 17:13:15 +0200616 batadv_ogm_packet->seqno = htonl(seqno);
Marek Lindner14511512012-08-02 17:20:26 +0200617 atomic_inc(&hard_iface->bat_iv.ogm_seqno);
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200618
Sven Eckelmann807736f2012-07-15 22:26:51 +0200619 batadv_ogm_packet->ttvn = atomic_read(&bat_priv->tt.vn);
620 batadv_ogm_packet->tt_crc = htons(bat_priv->tt.local_crc);
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200621 if (tt_num_changes >= 0)
Sven Eckelmann96412692012-06-05 22:31:30 +0200622 batadv_ogm_packet->tt_num_changes = tt_num_changes;
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200623
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200624 if (vis_server == BATADV_VIS_TYPE_SERVER_SYNC)
Sven Eckelmann96412692012-06-05 22:31:30 +0200625 batadv_ogm_packet->flags |= BATADV_VIS_SERVER;
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200626 else
Sven Eckelmann96412692012-06-05 22:31:30 +0200627 batadv_ogm_packet->flags &= ~BATADV_VIS_SERVER;
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200628
Sven Eckelmannbbb1f902012-07-08 17:13:15 +0200629 if (hard_iface == primary_if &&
630 atomic_read(&bat_priv->gw_mode) == BATADV_GW_MODE_SERVER) {
631 bandwidth = (uint8_t)atomic_read(&bat_priv->gw_bandwidth);
632 batadv_ogm_packet->gw_flags = bandwidth;
633 } else {
Sven Eckelmann96412692012-06-05 22:31:30 +0200634 batadv_ogm_packet->gw_flags = BATADV_NO_FLAGS;
Sven Eckelmannbbb1f902012-07-08 17:13:15 +0200635 }
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200636
Sven Eckelmann30d3c512012-05-12 02:09:36 +0200637 batadv_slide_own_bcast_window(hard_iface);
Marek Lindner14511512012-08-02 17:20:26 +0200638 batadv_iv_ogm_queue_add(bat_priv, hard_iface->bat_iv.ogm_buff,
639 hard_iface->bat_iv.ogm_buff_len, hard_iface, 1,
Sven Eckelmannfe8bc392012-05-12 18:33:51 +0200640 batadv_iv_ogm_emit_send_time(bat_priv));
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200641
642 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +0200643 batadv_hardif_free_ref(primary_if);
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200644}
645
Sven Eckelmannfe8bc392012-05-12 18:33:51 +0200646static void
Sven Eckelmann56303d32012-06-05 22:31:31 +0200647batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv,
648 struct batadv_orig_node *orig_node,
Sven Eckelmannfe8bc392012-05-12 18:33:51 +0200649 const struct ethhdr *ethhdr,
Sven Eckelmann96412692012-06-05 22:31:30 +0200650 const struct batadv_ogm_packet *batadv_ogm_packet,
Sven Eckelmann56303d32012-06-05 22:31:31 +0200651 struct batadv_hard_iface *if_incoming,
Sven Eckelmannfe8bc392012-05-12 18:33:51 +0200652 const unsigned char *tt_buff,
653 int is_duplicate)
Marek Lindnerfc957272011-07-30 12:04:12 +0200654{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200655 struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;
656 struct batadv_neigh_node *router = NULL;
657 struct batadv_orig_node *orig_node_tmp;
Linus LĂĽssing7caf69f2012-09-18 03:01:08 +0200658 int if_num;
Sven Eckelmannbbb1f902012-07-08 17:13:15 +0200659 uint8_t sum_orig, sum_neigh;
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200660 uint8_t *neigh_addr;
Sven Eckelmannbbb1f902012-07-08 17:13:15 +0200661 uint8_t tq_avg;
Marek Lindnerfc957272011-07-30 12:04:12 +0200662
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200663 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200664 "update_originator(): Searching and updating originator entry of received packet\n");
Marek Lindnerfc957272011-07-30 12:04:12 +0200665
666 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -0800667 hlist_for_each_entry_rcu(tmp_neigh_node,
Marek Lindnerfc957272011-07-30 12:04:12 +0200668 &orig_node->neigh_list, list) {
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200669 neigh_addr = tmp_neigh_node->addr;
670 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
671 tmp_neigh_node->if_incoming == if_incoming &&
672 atomic_inc_not_zero(&tmp_neigh_node->refcount)) {
Marek Lindnerfc957272011-07-30 12:04:12 +0200673 if (neigh_node)
Sven Eckelmann7d211ef2012-05-12 02:09:34 +0200674 batadv_neigh_node_free_ref(neigh_node);
Marek Lindnerfc957272011-07-30 12:04:12 +0200675 neigh_node = tmp_neigh_node;
676 continue;
677 }
678
679 if (is_duplicate)
680 continue;
681
Marek Lindnere3b0d0d2012-03-17 15:28:32 +0800682 spin_lock_bh(&tmp_neigh_node->lq_update_lock);
Sven Eckelmann925a6672012-05-12 02:09:35 +0200683 batadv_ring_buffer_set(tmp_neigh_node->tq_recv,
684 &tmp_neigh_node->tq_index, 0);
Sven Eckelmannbbb1f902012-07-08 17:13:15 +0200685 tq_avg = batadv_ring_buffer_avg(tmp_neigh_node->tq_recv);
686 tmp_neigh_node->tq_avg = tq_avg;
Marek Lindnere3b0d0d2012-03-17 15:28:32 +0800687 spin_unlock_bh(&tmp_neigh_node->lq_update_lock);
Marek Lindnerfc957272011-07-30 12:04:12 +0200688 }
689
690 if (!neigh_node) {
Sven Eckelmann56303d32012-06-05 22:31:31 +0200691 struct batadv_orig_node *orig_tmp;
Marek Lindnerfc957272011-07-30 12:04:12 +0200692
Sven Eckelmann7d211ef2012-05-12 02:09:34 +0200693 orig_tmp = batadv_get_orig_node(bat_priv, ethhdr->h_source);
Marek Lindnerfc957272011-07-30 12:04:12 +0200694 if (!orig_tmp)
695 goto unlock;
696
Sven Eckelmannfe8bc392012-05-12 18:33:51 +0200697 neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
698 ethhdr->h_source,
699 orig_node, orig_tmp,
Sven Eckelmann96412692012-06-05 22:31:30 +0200700 batadv_ogm_packet->seqno);
Marek Lindnerfc957272011-07-30 12:04:12 +0200701
Sven Eckelmann7d211ef2012-05-12 02:09:34 +0200702 batadv_orig_node_free_ref(orig_tmp);
Marek Lindnerfc957272011-07-30 12:04:12 +0200703 if (!neigh_node)
704 goto unlock;
705 } else
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200706 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200707 "Updating existing last-hop neighbor of originator\n");
Marek Lindnerfc957272011-07-30 12:04:12 +0200708
709 rcu_read_unlock();
710
Sven Eckelmann96412692012-06-05 22:31:30 +0200711 orig_node->flags = batadv_ogm_packet->flags;
Marek Lindnerd7b2a972012-03-01 15:35:19 +0800712 neigh_node->last_seen = jiffies;
Marek Lindnerfc957272011-07-30 12:04:12 +0200713
Marek Lindnere3b0d0d2012-03-17 15:28:32 +0800714 spin_lock_bh(&neigh_node->lq_update_lock);
Sven Eckelmann925a6672012-05-12 02:09:35 +0200715 batadv_ring_buffer_set(neigh_node->tq_recv,
716 &neigh_node->tq_index,
Sven Eckelmann96412692012-06-05 22:31:30 +0200717 batadv_ogm_packet->tq);
Sven Eckelmann925a6672012-05-12 02:09:35 +0200718 neigh_node->tq_avg = batadv_ring_buffer_avg(neigh_node->tq_recv);
Marek Lindnere3b0d0d2012-03-17 15:28:32 +0800719 spin_unlock_bh(&neigh_node->lq_update_lock);
Marek Lindnerfc957272011-07-30 12:04:12 +0200720
721 if (!is_duplicate) {
Sven Eckelmann96412692012-06-05 22:31:30 +0200722 orig_node->last_ttl = batadv_ogm_packet->header.ttl;
723 neigh_node->last_ttl = batadv_ogm_packet->header.ttl;
Marek Lindnerfc957272011-07-30 12:04:12 +0200724 }
725
Sven Eckelmann30d3c512012-05-12 02:09:36 +0200726 batadv_bonding_candidate_add(orig_node, neigh_node);
Marek Lindnerfc957272011-07-30 12:04:12 +0200727
728 /* if this neighbor already is our next hop there is nothing
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200729 * to change
730 */
Sven Eckelmann7d211ef2012-05-12 02:09:34 +0200731 router = batadv_orig_node_get_router(orig_node);
Marek Lindnerfc957272011-07-30 12:04:12 +0200732 if (router == neigh_node)
733 goto update_tt;
734
735 /* if this neighbor does not offer a better TQ we won't consider it */
736 if (router && (router->tq_avg > neigh_node->tq_avg))
737 goto update_tt;
738
739 /* if the TQ is the same and the link not more symmetric we
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200740 * won't consider it either
741 */
Marek Lindnerfc957272011-07-30 12:04:12 +0200742 if (router && (neigh_node->tq_avg == router->tq_avg)) {
743 orig_node_tmp = router->orig_node;
744 spin_lock_bh(&orig_node_tmp->ogm_cnt_lock);
Linus LĂĽssing7caf69f2012-09-18 03:01:08 +0200745 if_num = router->if_incoming->if_num;
746 sum_orig = orig_node_tmp->bcast_own_sum[if_num];
Marek Lindnerfc957272011-07-30 12:04:12 +0200747 spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock);
748
749 orig_node_tmp = neigh_node->orig_node;
750 spin_lock_bh(&orig_node_tmp->ogm_cnt_lock);
Linus LĂĽssing7caf69f2012-09-18 03:01:08 +0200751 if_num = neigh_node->if_incoming->if_num;
752 sum_neigh = orig_node_tmp->bcast_own_sum[if_num];
Marek Lindnerfc957272011-07-30 12:04:12 +0200753 spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock);
754
Sven Eckelmannbbb1f902012-07-08 17:13:15 +0200755 if (sum_orig >= sum_neigh)
Marek Lindnerfc957272011-07-30 12:04:12 +0200756 goto update_tt;
757 }
758
Sven Eckelmann30d3c512012-05-12 02:09:36 +0200759 batadv_update_route(bat_priv, orig_node, neigh_node);
Marek Lindnerfc957272011-07-30 12:04:12 +0200760
761update_tt:
762 /* I have to check for transtable changes only if the OGM has been
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200763 * sent through a primary interface
764 */
Sven Eckelmann96412692012-06-05 22:31:30 +0200765 if (((batadv_ogm_packet->orig != ethhdr->h_source) &&
766 (batadv_ogm_packet->header.ttl > 2)) ||
767 (batadv_ogm_packet->flags & BATADV_PRIMARIES_FIRST_HOP))
Sven Eckelmann08c36d32012-05-12 02:09:39 +0200768 batadv_tt_update_orig(bat_priv, orig_node, tt_buff,
Sven Eckelmann96412692012-06-05 22:31:30 +0200769 batadv_ogm_packet->tt_num_changes,
770 batadv_ogm_packet->ttvn,
771 ntohs(batadv_ogm_packet->tt_crc));
Marek Lindnerfc957272011-07-30 12:04:12 +0200772
Sven Eckelmann96412692012-06-05 22:31:30 +0200773 if (orig_node->gw_flags != batadv_ogm_packet->gw_flags)
Sven Eckelmann7cf06bc2012-05-12 02:09:29 +0200774 batadv_gw_node_update(bat_priv, orig_node,
Sven Eckelmann96412692012-06-05 22:31:30 +0200775 batadv_ogm_packet->gw_flags);
Marek Lindnerfc957272011-07-30 12:04:12 +0200776
Sven Eckelmann96412692012-06-05 22:31:30 +0200777 orig_node->gw_flags = batadv_ogm_packet->gw_flags;
Marek Lindnerfc957272011-07-30 12:04:12 +0200778
779 /* restart gateway selection if fast or late switching was enabled */
780 if ((orig_node->gw_flags) &&
Sven Eckelmanncd646ab2012-06-03 22:19:18 +0200781 (atomic_read(&bat_priv->gw_mode) == BATADV_GW_MODE_CLIENT) &&
Marek Lindnerfc957272011-07-30 12:04:12 +0200782 (atomic_read(&bat_priv->gw_sel_class) > 2))
Sven Eckelmann7cf06bc2012-05-12 02:09:29 +0200783 batadv_gw_check_election(bat_priv, orig_node);
Marek Lindnerfc957272011-07-30 12:04:12 +0200784
785 goto out;
786
787unlock:
788 rcu_read_unlock();
789out:
790 if (neigh_node)
Sven Eckelmann7d211ef2012-05-12 02:09:34 +0200791 batadv_neigh_node_free_ref(neigh_node);
Marek Lindnerfc957272011-07-30 12:04:12 +0200792 if (router)
Sven Eckelmann7d211ef2012-05-12 02:09:34 +0200793 batadv_neigh_node_free_ref(router);
Marek Lindnerfc957272011-07-30 12:04:12 +0200794}
795
Sven Eckelmann56303d32012-06-05 22:31:31 +0200796static int batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node,
797 struct batadv_orig_node *orig_neigh_node,
Sven Eckelmann96412692012-06-05 22:31:30 +0200798 struct batadv_ogm_packet *batadv_ogm_packet,
Sven Eckelmann56303d32012-06-05 22:31:31 +0200799 struct batadv_hard_iface *if_incoming)
Marek Lindnerfc957272011-07-30 12:04:12 +0200800{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200801 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
802 struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node;
Marek Lindnerfc957272011-07-30 12:04:12 +0200803 uint8_t total_count;
Sven Eckelmann42d0b042012-06-03 22:19:17 +0200804 uint8_t orig_eq_count, neigh_rq_count, neigh_rq_inv, tq_own;
805 unsigned int neigh_rq_inv_cube, neigh_rq_max_cube;
806 int tq_asym_penalty, inv_asym_penalty, ret = 0;
807 unsigned int combined_tq;
Marek Lindnerfc957272011-07-30 12:04:12 +0200808
809 /* find corresponding one hop neighbor */
810 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -0800811 hlist_for_each_entry_rcu(tmp_neigh_node,
Marek Lindnerfc957272011-07-30 12:04:12 +0200812 &orig_neigh_node->neigh_list, list) {
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200813 if (!batadv_compare_eth(tmp_neigh_node->addr,
814 orig_neigh_node->orig))
Marek Lindnerfc957272011-07-30 12:04:12 +0200815 continue;
816
817 if (tmp_neigh_node->if_incoming != if_incoming)
818 continue;
819
820 if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
821 continue;
822
823 neigh_node = tmp_neigh_node;
824 break;
825 }
826 rcu_read_unlock();
827
828 if (!neigh_node)
Sven Eckelmannfe8bc392012-05-12 18:33:51 +0200829 neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
830 orig_neigh_node->orig,
831 orig_neigh_node,
832 orig_neigh_node,
Sven Eckelmann96412692012-06-05 22:31:30 +0200833 batadv_ogm_packet->seqno);
Marek Lindnerfc957272011-07-30 12:04:12 +0200834
835 if (!neigh_node)
836 goto out;
837
Marek Lindnerd7b2a972012-03-01 15:35:19 +0800838 /* if orig_node is direct neighbor update neigh_node last_seen */
Marek Lindnerfc957272011-07-30 12:04:12 +0200839 if (orig_node == orig_neigh_node)
Marek Lindnerd7b2a972012-03-01 15:35:19 +0800840 neigh_node->last_seen = jiffies;
Marek Lindnerfc957272011-07-30 12:04:12 +0200841
Marek Lindnerd7b2a972012-03-01 15:35:19 +0800842 orig_node->last_seen = jiffies;
Marek Lindnerfc957272011-07-30 12:04:12 +0200843
844 /* find packet count of corresponding one hop neighbor */
845 spin_lock_bh(&orig_node->ogm_cnt_lock);
846 orig_eq_count = orig_neigh_node->bcast_own_sum[if_incoming->if_num];
847 neigh_rq_count = neigh_node->real_packet_count;
848 spin_unlock_bh(&orig_node->ogm_cnt_lock);
849
850 /* pay attention to not get a value bigger than 100 % */
Sven Eckelmannc67893d2012-07-08 18:33:51 +0200851 if (orig_eq_count > neigh_rq_count)
852 total_count = neigh_rq_count;
853 else
854 total_count = orig_eq_count;
Marek Lindnerfc957272011-07-30 12:04:12 +0200855
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200856 /* if we have too few packets (too less data) we set tq_own to zero
857 * if we receive too few packets it is not considered bidirectional
858 */
Sven Eckelmann42d0b042012-06-03 22:19:17 +0200859 if (total_count < BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM ||
860 neigh_rq_count < BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM)
Marek Lindnerfc957272011-07-30 12:04:12 +0200861 tq_own = 0;
862 else
863 /* neigh_node->real_packet_count is never zero as we
864 * only purge old information when getting new
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200865 * information
866 */
Sven Eckelmann42d0b042012-06-03 22:19:17 +0200867 tq_own = (BATADV_TQ_MAX_VALUE * total_count) / neigh_rq_count;
Marek Lindnerfc957272011-07-30 12:04:12 +0200868
Sven Eckelmann21a12362012-03-07 09:07:46 +0100869 /* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does
Marek Lindnerfc957272011-07-30 12:04:12 +0200870 * affect the nearly-symmetric links only a little, but
871 * punishes asymmetric links more. This will give a value
872 * between 0 and TQ_MAX_VALUE
873 */
Sven Eckelmann42d0b042012-06-03 22:19:17 +0200874 neigh_rq_inv = BATADV_TQ_LOCAL_WINDOW_SIZE - neigh_rq_count;
875 neigh_rq_inv_cube = neigh_rq_inv * neigh_rq_inv * neigh_rq_inv;
876 neigh_rq_max_cube = BATADV_TQ_LOCAL_WINDOW_SIZE *
877 BATADV_TQ_LOCAL_WINDOW_SIZE *
878 BATADV_TQ_LOCAL_WINDOW_SIZE;
879 inv_asym_penalty = BATADV_TQ_MAX_VALUE * neigh_rq_inv_cube;
880 inv_asym_penalty /= neigh_rq_max_cube;
881 tq_asym_penalty = BATADV_TQ_MAX_VALUE - inv_asym_penalty;
Marek Lindnerfc957272011-07-30 12:04:12 +0200882
Sven Eckelmann96412692012-06-05 22:31:30 +0200883 combined_tq = batadv_ogm_packet->tq * tq_own * tq_asym_penalty;
Sven Eckelmann42d0b042012-06-03 22:19:17 +0200884 combined_tq /= BATADV_TQ_MAX_VALUE * BATADV_TQ_MAX_VALUE;
Sven Eckelmann96412692012-06-05 22:31:30 +0200885 batadv_ogm_packet->tq = combined_tq;
Marek Lindnerfc957272011-07-30 12:04:12 +0200886
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200887 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200888 "bidirectional: orig = %-15pM neigh = %-15pM => own_bcast = %2i, real recv = %2i, local tq: %3i, asym_penalty: %3i, total tq: %3i\n",
889 orig_node->orig, orig_neigh_node->orig, total_count,
890 neigh_rq_count, tq_own,
Sven Eckelmann96412692012-06-05 22:31:30 +0200891 tq_asym_penalty, batadv_ogm_packet->tq);
Marek Lindnerfc957272011-07-30 12:04:12 +0200892
893 /* if link has the minimum required transmission quality
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200894 * consider it bidirectional
895 */
Sven Eckelmann96412692012-06-05 22:31:30 +0200896 if (batadv_ogm_packet->tq >= BATADV_TQ_TOTAL_BIDRECT_LIMIT)
Marek Lindnerfc957272011-07-30 12:04:12 +0200897 ret = 1;
898
899out:
900 if (neigh_node)
Sven Eckelmann7d211ef2012-05-12 02:09:34 +0200901 batadv_neigh_node_free_ref(neigh_node);
Marek Lindnerfc957272011-07-30 12:04:12 +0200902 return ret;
903}
904
905/* processes a batman packet for all interfaces, adjusts the sequence number and
906 * finds out whether it is a duplicate.
907 * returns:
908 * 1 the packet is a duplicate
909 * 0 the packet has not yet been received
910 * -1 the packet is old and has been received while the seqno window
911 * was protected. Caller should drop it.
912 */
Sven Eckelmannfe8bc392012-05-12 18:33:51 +0200913static int
914batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr,
Sven Eckelmann96412692012-06-05 22:31:30 +0200915 const struct batadv_ogm_packet *batadv_ogm_packet,
Sven Eckelmann56303d32012-06-05 22:31:31 +0200916 const struct batadv_hard_iface *if_incoming)
Marek Lindnerfc957272011-07-30 12:04:12 +0200917{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200918 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
919 struct batadv_orig_node *orig_node;
920 struct batadv_neigh_node *tmp_neigh_node;
Marek Lindnerfc957272011-07-30 12:04:12 +0200921 int is_duplicate = 0;
922 int32_t seq_diff;
923 int need_update = 0;
924 int set_mark, ret = -1;
Sven Eckelmann96412692012-06-05 22:31:30 +0200925 uint32_t seqno = ntohl(batadv_ogm_packet->seqno);
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200926 uint8_t *neigh_addr;
Sven Eckelmannbbb1f902012-07-08 17:13:15 +0200927 uint8_t packet_count;
Marek Lindnerfc957272011-07-30 12:04:12 +0200928
Sven Eckelmann96412692012-06-05 22:31:30 +0200929 orig_node = batadv_get_orig_node(bat_priv, batadv_ogm_packet->orig);
Marek Lindnerfc957272011-07-30 12:04:12 +0200930 if (!orig_node)
931 return 0;
932
933 spin_lock_bh(&orig_node->ogm_cnt_lock);
Al Viroe0f52112012-04-22 07:46:29 +0100934 seq_diff = seqno - orig_node->last_real_seqno;
Marek Lindnerfc957272011-07-30 12:04:12 +0200935
936 /* signalize caller that the packet is to be dropped. */
Antonio Quartulli1e5cc262012-02-26 15:39:42 +0100937 if (!hlist_empty(&orig_node->neigh_list) &&
Sven Eckelmann30d3c512012-05-12 02:09:36 +0200938 batadv_window_protected(bat_priv, seq_diff,
939 &orig_node->batman_seqno_reset))
Marek Lindnerfc957272011-07-30 12:04:12 +0200940 goto out;
941
942 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -0800943 hlist_for_each_entry_rcu(tmp_neigh_node,
Marek Lindnerfc957272011-07-30 12:04:12 +0200944 &orig_node->neigh_list, list) {
Sven Eckelmann9b4a1152012-05-12 13:48:53 +0200945 is_duplicate |= batadv_test_bit(tmp_neigh_node->real_bits,
946 orig_node->last_real_seqno,
947 seqno);
Marek Lindnerfc957272011-07-30 12:04:12 +0200948
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200949 neigh_addr = tmp_neigh_node->addr;
950 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
951 tmp_neigh_node->if_incoming == if_incoming)
Marek Lindnerfc957272011-07-30 12:04:12 +0200952 set_mark = 1;
953 else
954 set_mark = 0;
955
956 /* if the window moved, set the update flag. */
Sven Eckelmann0f5f93222012-05-12 02:09:25 +0200957 need_update |= batadv_bit_get_packet(bat_priv,
958 tmp_neigh_node->real_bits,
959 seq_diff, set_mark);
Marek Lindnerfc957272011-07-30 12:04:12 +0200960
Sven Eckelmannbbb1f902012-07-08 17:13:15 +0200961 packet_count = bitmap_weight(tmp_neigh_node->real_bits,
962 BATADV_TQ_LOCAL_WINDOW_SIZE);
963 tmp_neigh_node->real_packet_count = packet_count;
Marek Lindnerfc957272011-07-30 12:04:12 +0200964 }
965 rcu_read_unlock();
966
967 if (need_update) {
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200968 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200969 "updating last_seqno: old %u, new %u\n",
970 orig_node->last_real_seqno, seqno);
Al Viroe0f52112012-04-22 07:46:29 +0100971 orig_node->last_real_seqno = seqno;
Marek Lindnerfc957272011-07-30 12:04:12 +0200972 }
973
974 ret = is_duplicate;
975
976out:
977 spin_unlock_bh(&orig_node->ogm_cnt_lock);
Sven Eckelmann7d211ef2012-05-12 02:09:34 +0200978 batadv_orig_node_free_ref(orig_node);
Marek Lindnerfc957272011-07-30 12:04:12 +0200979 return ret;
980}
981
Sven Eckelmannfe8bc392012-05-12 18:33:51 +0200982static void batadv_iv_ogm_process(const struct ethhdr *ethhdr,
Sven Eckelmann96412692012-06-05 22:31:30 +0200983 struct batadv_ogm_packet *batadv_ogm_packet,
Sven Eckelmannfe8bc392012-05-12 18:33:51 +0200984 const unsigned char *tt_buff,
Sven Eckelmann56303d32012-06-05 22:31:31 +0200985 struct batadv_hard_iface *if_incoming)
Marek Lindnerfc957272011-07-30 12:04:12 +0200986{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200987 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
988 struct batadv_hard_iface *hard_iface;
989 struct batadv_orig_node *orig_neigh_node, *orig_node;
990 struct batadv_neigh_node *router = NULL, *router_router = NULL;
991 struct batadv_neigh_node *orig_neigh_router = NULL;
Marek Lindnerfc957272011-07-30 12:04:12 +0200992 int has_directlink_flag;
993 int is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0;
Sven Eckelmannfe8bc392012-05-12 18:33:51 +0200994 int is_broadcast = 0, is_bidirect;
Marek Lindner75cd33f2012-03-01 15:35:16 +0800995 bool is_single_hop_neigh = false;
Marek Lindner13b25412012-03-11 06:17:53 +0800996 bool is_from_best_next_hop = false;
Sven Eckelmannfe8bc392012-05-12 18:33:51 +0200997 int is_duplicate, sameseq, simlar_ttl;
Marek Lindnerfc957272011-07-30 12:04:12 +0200998 uint32_t if_incoming_seqno;
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200999 uint8_t *prev_sender;
Marek Lindnerfc957272011-07-30 12:04:12 +02001000
1001 /* Silently drop when the batman packet is actually not a
1002 * correct packet.
1003 *
1004 * This might happen if a packet is padded (e.g. Ethernet has a
1005 * minimum frame length of 64 byte) and the aggregation interprets
1006 * it as an additional length.
1007 *
1008 * TODO: A more sane solution would be to have a bit in the
Sven Eckelmann96412692012-06-05 22:31:30 +02001009 * batadv_ogm_packet to detect whether the packet is the last
Marek Lindnerfc957272011-07-30 12:04:12 +02001010 * packet in an aggregation. Here we expect that the padding
1011 * is always zero (or not 0x01)
1012 */
Sven Eckelmann96412692012-06-05 22:31:30 +02001013 if (batadv_ogm_packet->header.packet_type != BATADV_IV_OGM)
Marek Lindnerfc957272011-07-30 12:04:12 +02001014 return;
1015
1016 /* could be changed by schedule_own_packet() */
Marek Lindner14511512012-08-02 17:20:26 +02001017 if_incoming_seqno = atomic_read(&if_incoming->bat_iv.ogm_seqno);
Marek Lindnerfc957272011-07-30 12:04:12 +02001018
Sven Eckelmann96412692012-06-05 22:31:30 +02001019 if (batadv_ogm_packet->flags & BATADV_DIRECTLINK)
Sven Eckelmannacd34af2012-06-03 22:19:21 +02001020 has_directlink_flag = 1;
1021 else
1022 has_directlink_flag = 0;
Marek Lindnerfc957272011-07-30 12:04:12 +02001023
Sven Eckelmann96412692012-06-05 22:31:30 +02001024 if (batadv_compare_eth(ethhdr->h_source, batadv_ogm_packet->orig))
Marek Lindner75cd33f2012-03-01 15:35:16 +08001025 is_single_hop_neigh = true;
Marek Lindnerfc957272011-07-30 12:04:12 +02001026
Sven Eckelmann39c75a52012-06-03 22:19:22 +02001027 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
Antonio Quartullic0275e22012-12-11 20:29:22 +01001028 "Received BATMAN packet via NB: %pM, IF: %s [%pM] (from OG: %pM, via prev OG: %pM, seqno %u, ttvn %u, crc %#.4x, changes %u, tq %d, TTL %d, V %d, IDF %d)\n",
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001029 ethhdr->h_source, if_incoming->net_dev->name,
Sven Eckelmann96412692012-06-05 22:31:30 +02001030 if_incoming->net_dev->dev_addr, batadv_ogm_packet->orig,
1031 batadv_ogm_packet->prev_sender,
1032 ntohl(batadv_ogm_packet->seqno), batadv_ogm_packet->ttvn,
1033 ntohs(batadv_ogm_packet->tt_crc),
1034 batadv_ogm_packet->tt_num_changes, batadv_ogm_packet->tq,
1035 batadv_ogm_packet->header.ttl,
1036 batadv_ogm_packet->header.version, has_directlink_flag);
Marek Lindnerfc957272011-07-30 12:04:12 +02001037
1038 rcu_read_lock();
Sven Eckelmann3193e8f2012-05-12 02:09:42 +02001039 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
Sven Eckelmanne9a4f292012-06-03 22:19:19 +02001040 if (hard_iface->if_status != BATADV_IF_ACTIVE)
Marek Lindnerfc957272011-07-30 12:04:12 +02001041 continue;
1042
1043 if (hard_iface->soft_iface != if_incoming->soft_iface)
1044 continue;
1045
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001046 if (batadv_compare_eth(ethhdr->h_source,
1047 hard_iface->net_dev->dev_addr))
Marek Lindnerfc957272011-07-30 12:04:12 +02001048 is_my_addr = 1;
1049
Sven Eckelmann96412692012-06-05 22:31:30 +02001050 if (batadv_compare_eth(batadv_ogm_packet->orig,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001051 hard_iface->net_dev->dev_addr))
Marek Lindnerfc957272011-07-30 12:04:12 +02001052 is_my_orig = 1;
1053
Sven Eckelmann96412692012-06-05 22:31:30 +02001054 if (batadv_compare_eth(batadv_ogm_packet->prev_sender,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001055 hard_iface->net_dev->dev_addr))
Marek Lindnerfc957272011-07-30 12:04:12 +02001056 is_my_oldorig = 1;
1057
1058 if (is_broadcast_ether_addr(ethhdr->h_source))
1059 is_broadcast = 1;
1060 }
1061 rcu_read_unlock();
1062
Sven Eckelmann96412692012-06-05 22:31:30 +02001063 if (batadv_ogm_packet->header.version != BATADV_COMPAT_VERSION) {
Sven Eckelmann39c75a52012-06-03 22:19:22 +02001064 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001065 "Drop packet: incompatible batman version (%i)\n",
Sven Eckelmann96412692012-06-05 22:31:30 +02001066 batadv_ogm_packet->header.version);
Marek Lindnerfc957272011-07-30 12:04:12 +02001067 return;
1068 }
1069
1070 if (is_my_addr) {
Sven Eckelmann39c75a52012-06-03 22:19:22 +02001071 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001072 "Drop packet: received my own broadcast (sender: %pM)\n",
1073 ethhdr->h_source);
Marek Lindnerfc957272011-07-30 12:04:12 +02001074 return;
1075 }
1076
1077 if (is_broadcast) {
Sven Eckelmann39c75a52012-06-03 22:19:22 +02001078 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001079 "Drop packet: ignoring all packets with broadcast source addr (sender: %pM)\n",
1080 ethhdr->h_source);
Marek Lindnerfc957272011-07-30 12:04:12 +02001081 return;
1082 }
1083
1084 if (is_my_orig) {
1085 unsigned long *word;
1086 int offset;
Sven Eckelmann9b4a1152012-05-12 13:48:53 +02001087 int32_t bit_pos;
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001088 int16_t if_num;
1089 uint8_t *weight;
Marek Lindnerfc957272011-07-30 12:04:12 +02001090
Sven Eckelmann7d211ef2012-05-12 02:09:34 +02001091 orig_neigh_node = batadv_get_orig_node(bat_priv,
1092 ethhdr->h_source);
Marek Lindnerfc957272011-07-30 12:04:12 +02001093 if (!orig_neigh_node)
1094 return;
1095
1096 /* neighbor has to indicate direct link and it has to
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +02001097 * come via the corresponding interface
1098 * save packet seqno for bidirectional check
1099 */
Marek Lindnerfc957272011-07-30 12:04:12 +02001100 if (has_directlink_flag &&
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001101 batadv_compare_eth(if_incoming->net_dev->dev_addr,
Sven Eckelmann96412692012-06-05 22:31:30 +02001102 batadv_ogm_packet->orig)) {
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001103 if_num = if_incoming->if_num;
1104 offset = if_num * BATADV_NUM_WORDS;
Marek Lindnerfc957272011-07-30 12:04:12 +02001105
1106 spin_lock_bh(&orig_neigh_node->ogm_cnt_lock);
1107 word = &(orig_neigh_node->bcast_own[offset]);
Sven Eckelmann9b4a1152012-05-12 13:48:53 +02001108 bit_pos = if_incoming_seqno - 2;
Sven Eckelmann96412692012-06-05 22:31:30 +02001109 bit_pos -= ntohl(batadv_ogm_packet->seqno);
Sven Eckelmann9b4a1152012-05-12 13:48:53 +02001110 batadv_set_bit(word, bit_pos);
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001111 weight = &orig_neigh_node->bcast_own_sum[if_num];
1112 *weight = bitmap_weight(word,
1113 BATADV_TQ_LOCAL_WINDOW_SIZE);
Marek Lindnerfc957272011-07-30 12:04:12 +02001114 spin_unlock_bh(&orig_neigh_node->ogm_cnt_lock);
1115 }
1116
Sven Eckelmann39c75a52012-06-03 22:19:22 +02001117 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001118 "Drop packet: originator packet from myself (via neighbor)\n");
Sven Eckelmann7d211ef2012-05-12 02:09:34 +02001119 batadv_orig_node_free_ref(orig_neigh_node);
Marek Lindnerfc957272011-07-30 12:04:12 +02001120 return;
1121 }
1122
1123 if (is_my_oldorig) {
Sven Eckelmann39c75a52012-06-03 22:19:22 +02001124 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001125 "Drop packet: ignoring all rebroadcast echos (sender: %pM)\n",
1126 ethhdr->h_source);
Marek Lindnerfc957272011-07-30 12:04:12 +02001127 return;
1128 }
1129
Sven Eckelmann96412692012-06-05 22:31:30 +02001130 if (batadv_ogm_packet->flags & BATADV_NOT_BEST_NEXT_HOP) {
Sven Eckelmann39c75a52012-06-03 22:19:22 +02001131 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001132 "Drop packet: ignoring all packets not forwarded from the best next hop (sender: %pM)\n",
1133 ethhdr->h_source);
Marek Lindner13b25412012-03-11 06:17:53 +08001134 return;
1135 }
1136
Sven Eckelmann96412692012-06-05 22:31:30 +02001137 orig_node = batadv_get_orig_node(bat_priv, batadv_ogm_packet->orig);
Marek Lindnerfc957272011-07-30 12:04:12 +02001138 if (!orig_node)
1139 return;
1140
Sven Eckelmann96412692012-06-05 22:31:30 +02001141 is_duplicate = batadv_iv_ogm_update_seqnos(ethhdr, batadv_ogm_packet,
Sven Eckelmannfe8bc392012-05-12 18:33:51 +02001142 if_incoming);
Marek Lindnerfc957272011-07-30 12:04:12 +02001143
1144 if (is_duplicate == -1) {
Sven Eckelmann39c75a52012-06-03 22:19:22 +02001145 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001146 "Drop packet: packet within seqno protection time (sender: %pM)\n",
1147 ethhdr->h_source);
Marek Lindnerfc957272011-07-30 12:04:12 +02001148 goto out;
1149 }
1150
Sven Eckelmann96412692012-06-05 22:31:30 +02001151 if (batadv_ogm_packet->tq == 0) {
Sven Eckelmann39c75a52012-06-03 22:19:22 +02001152 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001153 "Drop packet: originator packet with tq equal 0\n");
Marek Lindnerfc957272011-07-30 12:04:12 +02001154 goto out;
1155 }
1156
Sven Eckelmann7d211ef2012-05-12 02:09:34 +02001157 router = batadv_orig_node_get_router(orig_node);
Marek Lindnerfc957272011-07-30 12:04:12 +02001158 if (router)
Sven Eckelmann7d211ef2012-05-12 02:09:34 +02001159 router_router = batadv_orig_node_get_router(router->orig_node);
Marek Lindnerfc957272011-07-30 12:04:12 +02001160
Marek Lindner13b25412012-03-11 06:17:53 +08001161 if ((router && router->tq_avg != 0) &&
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001162 (batadv_compare_eth(router->addr, ethhdr->h_source)))
Marek Lindner13b25412012-03-11 06:17:53 +08001163 is_from_best_next_hop = true;
1164
Sven Eckelmann96412692012-06-05 22:31:30 +02001165 prev_sender = batadv_ogm_packet->prev_sender;
Marek Lindnerfc957272011-07-30 12:04:12 +02001166 /* avoid temporary routing loops */
1167 if (router && router_router &&
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001168 (batadv_compare_eth(router->addr, prev_sender)) &&
Sven Eckelmann96412692012-06-05 22:31:30 +02001169 !(batadv_compare_eth(batadv_ogm_packet->orig, prev_sender)) &&
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001170 (batadv_compare_eth(router->addr, router_router->addr))) {
Sven Eckelmann39c75a52012-06-03 22:19:22 +02001171 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001172 "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n",
1173 ethhdr->h_source);
Marek Lindnerfc957272011-07-30 12:04:12 +02001174 goto out;
1175 }
1176
1177 /* if sender is a direct neighbor the sender mac equals
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +02001178 * originator mac
1179 */
Sven Eckelmannc67893d2012-07-08 18:33:51 +02001180 if (is_single_hop_neigh)
1181 orig_neigh_node = orig_node;
1182 else
1183 orig_neigh_node = batadv_get_orig_node(bat_priv,
1184 ethhdr->h_source);
1185
Marek Lindnerfc957272011-07-30 12:04:12 +02001186 if (!orig_neigh_node)
1187 goto out;
1188
Martin Hundebølld56b1702013-01-25 11:12:39 +01001189 /* Update nc_nodes of the originator */
1190 batadv_nc_update_nc_node(bat_priv, orig_node, orig_neigh_node,
1191 batadv_ogm_packet, is_single_hop_neigh);
1192
Sven Eckelmann7d211ef2012-05-12 02:09:34 +02001193 orig_neigh_router = batadv_orig_node_get_router(orig_neigh_node);
Marek Lindnerfc957272011-07-30 12:04:12 +02001194
1195 /* drop packet if sender is not a direct neighbor and if we
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +02001196 * don't route towards it
1197 */
Marek Lindnerfc957272011-07-30 12:04:12 +02001198 if (!is_single_hop_neigh && (!orig_neigh_router)) {
Sven Eckelmann39c75a52012-06-03 22:19:22 +02001199 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001200 "Drop packet: OGM via unknown neighbor!\n");
Marek Lindnerfc957272011-07-30 12:04:12 +02001201 goto out_neigh;
1202 }
1203
Sven Eckelmannfe8bc392012-05-12 18:33:51 +02001204 is_bidirect = batadv_iv_ogm_calc_tq(orig_node, orig_neigh_node,
Sven Eckelmann96412692012-06-05 22:31:30 +02001205 batadv_ogm_packet, if_incoming);
Marek Lindnerfc957272011-07-30 12:04:12 +02001206
Sven Eckelmann30d3c512012-05-12 02:09:36 +02001207 batadv_bonding_save_primary(orig_node, orig_neigh_node,
Sven Eckelmann96412692012-06-05 22:31:30 +02001208 batadv_ogm_packet);
Marek Lindnerfc957272011-07-30 12:04:12 +02001209
1210 /* update ranking if it is not a duplicate or has the same
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +02001211 * seqno and similar ttl as the non-duplicate
1212 */
Sven Eckelmann96412692012-06-05 22:31:30 +02001213 sameseq = orig_node->last_real_seqno == ntohl(batadv_ogm_packet->seqno);
1214 simlar_ttl = orig_node->last_ttl - 3 <= batadv_ogm_packet->header.ttl;
Sven Eckelmannfe8bc392012-05-12 18:33:51 +02001215 if (is_bidirect && (!is_duplicate || (sameseq && simlar_ttl)))
1216 batadv_iv_ogm_orig_update(bat_priv, orig_node, ethhdr,
Sven Eckelmann96412692012-06-05 22:31:30 +02001217 batadv_ogm_packet, if_incoming,
Sven Eckelmannfe8bc392012-05-12 18:33:51 +02001218 tt_buff, is_duplicate);
Marek Lindnerfc957272011-07-30 12:04:12 +02001219
1220 /* is single hop (direct) neighbor */
1221 if (is_single_hop_neigh) {
Marek Lindnerfc957272011-07-30 12:04:12 +02001222 /* mark direct link on incoming interface */
Sven Eckelmann96412692012-06-05 22:31:30 +02001223 batadv_iv_ogm_forward(orig_node, ethhdr, batadv_ogm_packet,
Sven Eckelmannfe8bc392012-05-12 18:33:51 +02001224 is_single_hop_neigh,
1225 is_from_best_next_hop, if_incoming);
Marek Lindnerfc957272011-07-30 12:04:12 +02001226
Sven Eckelmann39c75a52012-06-03 22:19:22 +02001227 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001228 "Forwarding packet: rebroadcast neighbor packet with direct link flag\n");
Marek Lindnerfc957272011-07-30 12:04:12 +02001229 goto out_neigh;
1230 }
1231
1232 /* multihop originator */
Sven Eckelmannfe8bc392012-05-12 18:33:51 +02001233 if (!is_bidirect) {
Sven Eckelmann39c75a52012-06-03 22:19:22 +02001234 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001235 "Drop packet: not received via bidirectional link\n");
Marek Lindnerfc957272011-07-30 12:04:12 +02001236 goto out_neigh;
1237 }
1238
1239 if (is_duplicate) {
Sven Eckelmann39c75a52012-06-03 22:19:22 +02001240 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001241 "Drop packet: duplicate packet received\n");
Marek Lindnerfc957272011-07-30 12:04:12 +02001242 goto out_neigh;
1243 }
1244
Sven Eckelmann39c75a52012-06-03 22:19:22 +02001245 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001246 "Forwarding packet: rebroadcast originator packet\n");
Sven Eckelmann96412692012-06-05 22:31:30 +02001247 batadv_iv_ogm_forward(orig_node, ethhdr, batadv_ogm_packet,
Sven Eckelmannfe8bc392012-05-12 18:33:51 +02001248 is_single_hop_neigh, is_from_best_next_hop,
1249 if_incoming);
Marek Lindnerfc957272011-07-30 12:04:12 +02001250
1251out_neigh:
1252 if ((orig_neigh_node) && (!is_single_hop_neigh))
Sven Eckelmann7d211ef2012-05-12 02:09:34 +02001253 batadv_orig_node_free_ref(orig_neigh_node);
Marek Lindnerfc957272011-07-30 12:04:12 +02001254out:
1255 if (router)
Sven Eckelmann7d211ef2012-05-12 02:09:34 +02001256 batadv_neigh_node_free_ref(router);
Marek Lindnerfc957272011-07-30 12:04:12 +02001257 if (router_router)
Sven Eckelmann7d211ef2012-05-12 02:09:34 +02001258 batadv_neigh_node_free_ref(router_router);
Marek Lindnerfc957272011-07-30 12:04:12 +02001259 if (orig_neigh_router)
Sven Eckelmann7d211ef2012-05-12 02:09:34 +02001260 batadv_neigh_node_free_ref(orig_neigh_router);
Marek Lindnerfc957272011-07-30 12:04:12 +02001261
Sven Eckelmann7d211ef2012-05-12 02:09:34 +02001262 batadv_orig_node_free_ref(orig_node);
Marek Lindnerfc957272011-07-30 12:04:12 +02001263}
1264
Sven Eckelmannfe8bc392012-05-12 18:33:51 +02001265static int batadv_iv_ogm_receive(struct sk_buff *skb,
Sven Eckelmann56303d32012-06-05 22:31:31 +02001266 struct batadv_hard_iface *if_incoming)
Marek Lindnerfc957272011-07-30 12:04:12 +02001267{
Sven Eckelmann56303d32012-06-05 22:31:31 +02001268 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
Sven Eckelmann96412692012-06-05 22:31:30 +02001269 struct batadv_ogm_packet *batadv_ogm_packet;
Marek Lindner8780dad2011-12-05 04:01:51 +08001270 struct ethhdr *ethhdr;
1271 int buff_pos = 0, packet_len;
1272 unsigned char *tt_buff, *packet_buff;
Marek Lindnerc3e29312012-03-04 16:56:25 +08001273 bool ret;
Sven Eckelmannc67893d2012-07-08 18:33:51 +02001274 uint8_t *packet_pos;
Marek Lindnerc3e29312012-03-04 16:56:25 +08001275
Sven Eckelmann7e071c72012-06-03 22:19:13 +02001276 ret = batadv_check_management_packet(skb, if_incoming, BATADV_OGM_HLEN);
Marek Lindnerc3e29312012-03-04 16:56:25 +08001277 if (!ret)
1278 return NET_RX_DROP;
Marek Lindnerfc957272011-07-30 12:04:12 +02001279
Marek Lindneredbf12b2012-03-11 06:17:49 +08001280 /* did we receive a B.A.T.M.A.N. IV OGM packet on an interface
1281 * that does not have B.A.T.M.A.N. IV enabled ?
1282 */
Sven Eckelmannfe8bc392012-05-12 18:33:51 +02001283 if (bat_priv->bat_algo_ops->bat_ogm_emit != batadv_iv_ogm_emit)
Marek Lindneredbf12b2012-03-11 06:17:49 +08001284 return NET_RX_DROP;
1285
Sven Eckelmannd69909d2012-06-03 22:19:20 +02001286 batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX);
1287 batadv_add_counter(bat_priv, BATADV_CNT_MGMT_RX_BYTES,
Martin Hundebøllf8214862012-04-20 17:02:45 +02001288 skb->len + ETH_HLEN);
1289
Marek Lindner8780dad2011-12-05 04:01:51 +08001290 packet_len = skb_headlen(skb);
1291 ethhdr = (struct ethhdr *)skb_mac_header(skb);
1292 packet_buff = skb->data;
Sven Eckelmann96412692012-06-05 22:31:30 +02001293 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff;
Marek Lindnerfc957272011-07-30 12:04:12 +02001294
1295 /* unpack the aggregated packets and process them one by one */
Marek Lindnerb47506d2013-03-04 10:39:49 +08001296 while (batadv_iv_ogm_aggr_packet(buff_pos, packet_len,
1297 batadv_ogm_packet->tt_num_changes)) {
Sven Eckelmann7e071c72012-06-03 22:19:13 +02001298 tt_buff = packet_buff + buff_pos + BATADV_OGM_HLEN;
Marek Lindnerfc957272011-07-30 12:04:12 +02001299
Sven Eckelmann96412692012-06-05 22:31:30 +02001300 batadv_iv_ogm_process(ethhdr, batadv_ogm_packet, tt_buff,
Sven Eckelmannfe8bc392012-05-12 18:33:51 +02001301 if_incoming);
Marek Lindnerfc957272011-07-30 12:04:12 +02001302
Sven Eckelmann7e071c72012-06-03 22:19:13 +02001303 buff_pos += BATADV_OGM_HLEN;
Sven Eckelmann96412692012-06-05 22:31:30 +02001304 buff_pos += batadv_tt_len(batadv_ogm_packet->tt_num_changes);
Marek Lindnerfc957272011-07-30 12:04:12 +02001305
Sven Eckelmannc67893d2012-07-08 18:33:51 +02001306 packet_pos = packet_buff + buff_pos;
1307 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
Marek Lindnerb47506d2013-03-04 10:39:49 +08001308 }
Marek Lindnerc3e29312012-03-04 16:56:25 +08001309
1310 kfree_skb(skb);
1311 return NET_RX_SUCCESS;
Marek Lindnerfc957272011-07-30 12:04:12 +02001312}
Marek Lindner1c280472011-11-28 17:40:17 +08001313
Sven Eckelmann56303d32012-06-05 22:31:31 +02001314static struct batadv_algo_ops batadv_batman_iv __read_mostly = {
Marek Lindner519d3492012-04-18 17:15:57 +08001315 .name = "BATMAN_IV",
Sven Eckelmannfe8bc392012-05-12 18:33:51 +02001316 .bat_iface_enable = batadv_iv_ogm_iface_enable,
1317 .bat_iface_disable = batadv_iv_ogm_iface_disable,
1318 .bat_iface_update_mac = batadv_iv_ogm_iface_update_mac,
1319 .bat_primary_iface_set = batadv_iv_ogm_primary_iface_set,
1320 .bat_ogm_schedule = batadv_iv_ogm_schedule,
1321 .bat_ogm_emit = batadv_iv_ogm_emit,
Marek Lindner1c280472011-11-28 17:40:17 +08001322};
1323
Sven Eckelmann81c524f2012-05-12 02:09:22 +02001324int __init batadv_iv_init(void)
Marek Lindner1c280472011-11-28 17:40:17 +08001325{
Marek Lindnerc3e29312012-03-04 16:56:25 +08001326 int ret;
1327
1328 /* batman originator packet */
Sven Eckelmannacd34af2012-06-03 22:19:21 +02001329 ret = batadv_recv_handler_register(BATADV_IV_OGM,
1330 batadv_iv_ogm_receive);
Marek Lindnerc3e29312012-03-04 16:56:25 +08001331 if (ret < 0)
1332 goto out;
1333
Sven Eckelmannfe8bc392012-05-12 18:33:51 +02001334 ret = batadv_algo_register(&batadv_batman_iv);
Marek Lindnerc3e29312012-03-04 16:56:25 +08001335 if (ret < 0)
1336 goto handler_unregister;
1337
1338 goto out;
1339
1340handler_unregister:
Sven Eckelmannacd34af2012-06-03 22:19:21 +02001341 batadv_recv_handler_unregister(BATADV_IV_OGM);
Marek Lindnerc3e29312012-03-04 16:56:25 +08001342out:
1343 return ret;
Marek Lindner1c280472011-11-28 17:40:17 +08001344}