Commit | Line | Data |
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9cfc7bd6 | 1 | /* Copyright (C) 2007-2012 B.A.T.M.A.N. contributors: |
fc957275 ML |
2 | * |
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 | |
fc957275 ML |
18 | */ |
19 | ||
20 | #include "main.h" | |
fc957275 ML |
21 | #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" | |
1c280471 | 29 | #include "bat_algo.h" |
fc957275 | 30 | |
56303d34 SE |
31 | static struct batadv_neigh_node * |
32 | batadv_iv_ogm_neigh_new(struct batadv_hard_iface *hard_iface, | |
33 | const uint8_t *neigh_addr, | |
34 | struct batadv_orig_node *orig_node, | |
35 | struct batadv_orig_node *orig_neigh, __be32 seqno) | |
7ae8b285 | 36 | { |
56303d34 | 37 | struct batadv_neigh_node *neigh_node; |
7ae8b285 | 38 | |
e0f5211f AV |
39 | neigh_node = batadv_neigh_node_new(hard_iface, neigh_addr, |
40 | ntohl(seqno)); | |
7ae8b285 ML |
41 | if (!neigh_node) |
42 | goto out; | |
43 | ||
44 | INIT_LIST_HEAD(&neigh_node->bonding_list); | |
7ae8b285 ML |
45 | |
46 | neigh_node->orig_node = orig_neigh; | |
47 | neigh_node->if_incoming = hard_iface; | |
48 | ||
49 | spin_lock_bh(&orig_node->neigh_list_lock); | |
50 | hlist_add_head_rcu(&neigh_node->list, &orig_node->neigh_list); | |
51 | spin_unlock_bh(&orig_node->neigh_list_lock); | |
52 | ||
53 | out: | |
54 | return neigh_node; | |
55 | } | |
56 | ||
56303d34 | 57 | static int batadv_iv_ogm_iface_enable(struct batadv_hard_iface *hard_iface) |
d0b9fd89 | 58 | { |
96412690 | 59 | struct batadv_ogm_packet *batadv_ogm_packet; |
14511519 | 60 | unsigned char *ogm_buff; |
d7d32ec0 | 61 | uint32_t random_seqno; |
5346c35e | 62 | int res = -ENOMEM; |
d7d32ec0 ML |
63 | |
64 | /* randomize initial seqno to avoid collision */ | |
65 | get_random_bytes(&random_seqno, sizeof(random_seqno)); | |
14511519 | 66 | atomic_set(&hard_iface->bat_iv.ogm_seqno, random_seqno); |
d0b9fd89 | 67 | |
14511519 ML |
68 | hard_iface->bat_iv.ogm_buff_len = BATADV_OGM_HLEN; |
69 | ogm_buff = kmalloc(hard_iface->bat_iv.ogm_buff_len, GFP_ATOMIC); | |
70 | if (!ogm_buff) | |
77af7575 ML |
71 | goto out; |
72 | ||
14511519 ML |
73 | hard_iface->bat_iv.ogm_buff = ogm_buff; |
74 | ||
75 | batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff; | |
96412690 SE |
76 | batadv_ogm_packet->header.packet_type = BATADV_IV_OGM; |
77 | batadv_ogm_packet->header.version = BATADV_COMPAT_VERSION; | |
78 | batadv_ogm_packet->header.ttl = 2; | |
79 | batadv_ogm_packet->flags = BATADV_NO_FLAGS; | |
80 | batadv_ogm_packet->tq = BATADV_TQ_MAX_VALUE; | |
81 | batadv_ogm_packet->tt_num_changes = 0; | |
82 | batadv_ogm_packet->ttvn = 0; | |
77af7575 ML |
83 | |
84 | res = 0; | |
85 | ||
86 | out: | |
87 | return res; | |
d0b9fd89 ML |
88 | } |
89 | ||
56303d34 | 90 | static void batadv_iv_ogm_iface_disable(struct batadv_hard_iface *hard_iface) |
00a50076 | 91 | { |
14511519 ML |
92 | kfree(hard_iface->bat_iv.ogm_buff); |
93 | hard_iface->bat_iv.ogm_buff = NULL; | |
00a50076 ML |
94 | } |
95 | ||
56303d34 | 96 | static void batadv_iv_ogm_iface_update_mac(struct batadv_hard_iface *hard_iface) |
d0b9fd89 | 97 | { |
96412690 | 98 | struct batadv_ogm_packet *batadv_ogm_packet; |
14511519 | 99 | unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff; |
d0b9fd89 | 100 | |
14511519 | 101 | batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff; |
96412690 | 102 | memcpy(batadv_ogm_packet->orig, |
c3229398 | 103 | hard_iface->net_dev->dev_addr, ETH_ALEN); |
96412690 | 104 | memcpy(batadv_ogm_packet->prev_sender, |
c3229398 | 105 | hard_iface->net_dev->dev_addr, ETH_ALEN); |
d0b9fd89 ML |
106 | } |
107 | ||
56303d34 SE |
108 | static void |
109 | batadv_iv_ogm_primary_iface_set(struct batadv_hard_iface *hard_iface) | |
d0b9fd89 | 110 | { |
96412690 | 111 | struct batadv_ogm_packet *batadv_ogm_packet; |
14511519 | 112 | unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff; |
d0b9fd89 | 113 | |
14511519 | 114 | batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff; |
96412690 SE |
115 | batadv_ogm_packet->flags = BATADV_PRIMARIES_FIRST_HOP; |
116 | batadv_ogm_packet->header.ttl = BATADV_TTL; | |
d0b9fd89 ML |
117 | } |
118 | ||
b9dacc52 | 119 | /* when do we schedule our own ogm to be sent */ |
fe8bc396 | 120 | static unsigned long |
56303d34 | 121 | batadv_iv_ogm_emit_send_time(const struct batadv_priv *bat_priv) |
b9dacc52 | 122 | { |
42d0b044 SE |
123 | unsigned int msecs; |
124 | ||
125 | msecs = atomic_read(&bat_priv->orig_interval) - BATADV_JITTER; | |
143cdd8f | 126 | msecs += random32() % (2 * BATADV_JITTER); |
42d0b044 SE |
127 | |
128 | return jiffies + msecs_to_jiffies(msecs); | |
b9dacc52 ML |
129 | } |
130 | ||
131 | /* when do we schedule a ogm packet to be sent */ | |
fe8bc396 | 132 | static unsigned long batadv_iv_ogm_fwd_send_time(void) |
b9dacc52 | 133 | { |
42d0b044 | 134 | return jiffies + msecs_to_jiffies(random32() % (BATADV_JITTER / 2)); |
b9dacc52 ML |
135 | } |
136 | ||
137 | /* apply hop penalty for a normal link */ | |
56303d34 SE |
138 | static uint8_t batadv_hop_penalty(uint8_t tq, |
139 | const struct batadv_priv *bat_priv) | |
b9dacc52 ML |
140 | { |
141 | int hop_penalty = atomic_read(&bat_priv->hop_penalty); | |
42d0b044 SE |
142 | int new_tq; |
143 | ||
144 | new_tq = tq * (BATADV_TQ_MAX_VALUE - hop_penalty); | |
145 | new_tq /= BATADV_TQ_MAX_VALUE; | |
146 | ||
147 | return new_tq; | |
b9dacc52 ML |
148 | } |
149 | ||
fc957275 | 150 | /* is there another aggregated packet here? */ |
fe8bc396 SE |
151 | static int batadv_iv_ogm_aggr_packet(int buff_pos, int packet_len, |
152 | int tt_num_changes) | |
fc957275 | 153 | { |
08c36d3e SE |
154 | int next_buff_pos = 0; |
155 | ||
7e071c79 | 156 | next_buff_pos += buff_pos + BATADV_OGM_HLEN; |
08c36d3e | 157 | next_buff_pos += batadv_tt_len(tt_num_changes); |
fc957275 ML |
158 | |
159 | return (next_buff_pos <= packet_len) && | |
42d0b044 | 160 | (next_buff_pos <= BATADV_MAX_AGGREGATION_BYTES); |
fc957275 ML |
161 | } |
162 | ||
b9dacc52 | 163 | /* send a batman ogm to a given interface */ |
56303d34 SE |
164 | static void batadv_iv_ogm_send_to_if(struct batadv_forw_packet *forw_packet, |
165 | struct batadv_hard_iface *hard_iface) | |
b9dacc52 | 166 | { |
56303d34 | 167 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
b9dacc52 ML |
168 | char *fwd_str; |
169 | uint8_t packet_num; | |
170 | int16_t buff_pos; | |
96412690 | 171 | struct batadv_ogm_packet *batadv_ogm_packet; |
b9dacc52 | 172 | struct sk_buff *skb; |
c67893d1 | 173 | uint8_t *packet_pos; |
b9dacc52 | 174 | |
e9a4f295 | 175 | if (hard_iface->if_status != BATADV_IF_ACTIVE) |
b9dacc52 ML |
176 | return; |
177 | ||
178 | packet_num = 0; | |
179 | buff_pos = 0; | |
c67893d1 SE |
180 | packet_pos = forw_packet->skb->data; |
181 | batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos; | |
b9dacc52 ML |
182 | |
183 | /* adjust all flags and log packets */ | |
fe8bc396 | 184 | while (batadv_iv_ogm_aggr_packet(buff_pos, forw_packet->packet_len, |
96412690 | 185 | batadv_ogm_packet->tt_num_changes)) { |
b9dacc52 ML |
186 | |
187 | /* we might have aggregated direct link packets with an | |
9cfc7bd6 SE |
188 | * ordinary base packet |
189 | */ | |
8de47de5 SE |
190 | if (forw_packet->direct_link_flags & BIT(packet_num) && |
191 | forw_packet->if_incoming == hard_iface) | |
96412690 | 192 | batadv_ogm_packet->flags |= BATADV_DIRECTLINK; |
b9dacc52 | 193 | else |
96412690 | 194 | batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK; |
b9dacc52 | 195 | |
c67893d1 SE |
196 | if (packet_num > 0 || !forw_packet->own) |
197 | fwd_str = "Forwarding"; | |
198 | else | |
199 | fwd_str = "Sending own"; | |
200 | ||
39c75a51 | 201 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
202 | "%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 " : ""), | |
96412690 SE |
204 | 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 ? | |
1eda58bf | 208 | "on" : "off"), |
96412690 | 209 | batadv_ogm_packet->ttvn, hard_iface->net_dev->name, |
1eda58bf | 210 | hard_iface->net_dev->dev_addr); |
b9dacc52 | 211 | |
7e071c79 | 212 | buff_pos += BATADV_OGM_HLEN; |
96412690 | 213 | buff_pos += batadv_tt_len(batadv_ogm_packet->tt_num_changes); |
b9dacc52 | 214 | packet_num++; |
c67893d1 SE |
215 | packet_pos = forw_packet->skb->data + buff_pos; |
216 | batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos; | |
b9dacc52 ML |
217 | } |
218 | ||
219 | /* create clone because function is called more than once */ | |
220 | skb = skb_clone(forw_packet->skb, GFP_ATOMIC); | |
f8214865 | 221 | if (skb) { |
d69909d2 SE |
222 | batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_TX); |
223 | batadv_add_counter(bat_priv, BATADV_CNT_MGMT_TX_BYTES, | |
f8214865 | 224 | skb->len + ETH_HLEN); |
3193e8fd | 225 | batadv_send_skb_packet(skb, hard_iface, batadv_broadcast_addr); |
f8214865 | 226 | } |
b9dacc52 ML |
227 | } |
228 | ||
229 | /* send a batman ogm packet */ | |
56303d34 | 230 | static void batadv_iv_ogm_emit(struct batadv_forw_packet *forw_packet) |
b9dacc52 | 231 | { |
56303d34 | 232 | struct batadv_hard_iface *hard_iface; |
b9dacc52 | 233 | struct net_device *soft_iface; |
56303d34 SE |
234 | struct batadv_priv *bat_priv; |
235 | struct batadv_hard_iface *primary_if = NULL; | |
96412690 | 236 | struct batadv_ogm_packet *batadv_ogm_packet; |
b9dacc52 | 237 | unsigned char directlink; |
c67893d1 | 238 | uint8_t *packet_pos; |
b9dacc52 | 239 | |
c67893d1 SE |
240 | packet_pos = forw_packet->skb->data; |
241 | batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos; | |
96412690 | 242 | directlink = (batadv_ogm_packet->flags & BATADV_DIRECTLINK ? 1 : 0); |
b9dacc52 ML |
243 | |
244 | if (!forw_packet->if_incoming) { | |
86ceb360 | 245 | pr_err("Error - can't forward packet: incoming iface not specified\n"); |
b9dacc52 ML |
246 | goto out; |
247 | } | |
248 | ||
249 | soft_iface = forw_packet->if_incoming->soft_iface; | |
250 | bat_priv = netdev_priv(soft_iface); | |
251 | ||
e9a4f295 | 252 | if (forw_packet->if_incoming->if_status != BATADV_IF_ACTIVE) |
b9dacc52 ML |
253 | goto out; |
254 | ||
e5d89254 | 255 | primary_if = batadv_primary_if_get_selected(bat_priv); |
b9dacc52 ML |
256 | if (!primary_if) |
257 | goto out; | |
258 | ||
9cfc7bd6 SE |
259 | /* multihomed peer assumed |
260 | * non-primary OGMs are only broadcasted on their interface | |
261 | */ | |
96412690 | 262 | if ((directlink && (batadv_ogm_packet->header.ttl == 1)) || |
b9dacc52 ML |
263 | (forw_packet->own && (forw_packet->if_incoming != primary_if))) { |
264 | ||
265 | /* FIXME: what about aggregated packets ? */ | |
39c75a51 | 266 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
267 | "%s packet (originator %pM, seqno %u, TTL %d) on interface %s [%pM]\n", |
268 | (forw_packet->own ? "Sending own" : "Forwarding"), | |
96412690 SE |
269 | batadv_ogm_packet->orig, |
270 | ntohl(batadv_ogm_packet->seqno), | |
271 | batadv_ogm_packet->header.ttl, | |
1eda58bf SE |
272 | forw_packet->if_incoming->net_dev->name, |
273 | forw_packet->if_incoming->net_dev->dev_addr); | |
b9dacc52 ML |
274 | |
275 | /* skb is only used once and than forw_packet is free'd */ | |
9455e34c SE |
276 | batadv_send_skb_packet(forw_packet->skb, |
277 | forw_packet->if_incoming, | |
3193e8fd | 278 | batadv_broadcast_addr); |
b9dacc52 ML |
279 | forw_packet->skb = NULL; |
280 | ||
281 | goto out; | |
282 | } | |
283 | ||
284 | /* broadcast on every interface */ | |
285 | rcu_read_lock(); | |
3193e8fd | 286 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
b9dacc52 ML |
287 | if (hard_iface->soft_iface != soft_iface) |
288 | continue; | |
289 | ||
fe8bc396 | 290 | batadv_iv_ogm_send_to_if(forw_packet, hard_iface); |
b9dacc52 ML |
291 | } |
292 | rcu_read_unlock(); | |
293 | ||
294 | out: | |
295 | if (primary_if) | |
e5d89254 | 296 | batadv_hardif_free_ref(primary_if); |
b9dacc52 ML |
297 | } |
298 | ||
299 | /* return true if new_packet can be aggregated with forw_packet */ | |
fe8bc396 | 300 | static bool |
96412690 | 301 | batadv_iv_ogm_can_aggregate(const struct batadv_ogm_packet *new_bat_ogm_packet, |
56303d34 | 302 | struct batadv_priv *bat_priv, |
fe8bc396 SE |
303 | int packet_len, unsigned long send_time, |
304 | bool directlink, | |
56303d34 SE |
305 | const struct batadv_hard_iface *if_incoming, |
306 | const struct batadv_forw_packet *forw_packet) | |
b9dacc52 | 307 | { |
96412690 | 308 | struct batadv_ogm_packet *batadv_ogm_packet; |
b9dacc52 | 309 | int aggregated_bytes = forw_packet->packet_len + packet_len; |
56303d34 | 310 | struct batadv_hard_iface *primary_if = NULL; |
b9dacc52 | 311 | bool res = false; |
42d0b044 | 312 | unsigned long aggregation_end_time; |
b9dacc52 | 313 | |
96412690 | 314 | batadv_ogm_packet = (struct batadv_ogm_packet *)forw_packet->skb->data; |
42d0b044 SE |
315 | aggregation_end_time = send_time; |
316 | aggregation_end_time += msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS); | |
b9dacc52 | 317 | |
9cfc7bd6 | 318 | /* we can aggregate the current packet to this aggregated packet |
b9dacc52 ML |
319 | * if: |
320 | * | |
321 | * - the send time is within our MAX_AGGREGATION_MS time | |
322 | * - the resulting packet wont be bigger than | |
323 | * MAX_AGGREGATION_BYTES | |
324 | */ | |
b9dacc52 | 325 | if (time_before(send_time, forw_packet->send_time) && |
42d0b044 SE |
326 | time_after_eq(aggregation_end_time, forw_packet->send_time) && |
327 | (aggregated_bytes <= BATADV_MAX_AGGREGATION_BYTES)) { | |
b9dacc52 | 328 | |
9cfc7bd6 | 329 | /* check aggregation compatibility |
b9dacc52 ML |
330 | * -> direct link packets are broadcasted on |
331 | * their interface only | |
332 | * -> aggregate packet if the current packet is | |
333 | * a "global" packet as well as the base | |
334 | * packet | |
335 | */ | |
e5d89254 | 336 | primary_if = batadv_primary_if_get_selected(bat_priv); |
b9dacc52 ML |
337 | if (!primary_if) |
338 | goto out; | |
339 | ||
340 | /* packets without direct link flag and high TTL | |
9cfc7bd6 SE |
341 | * are flooded through the net |
342 | */ | |
b9dacc52 | 343 | if ((!directlink) && |
96412690 SE |
344 | (!(batadv_ogm_packet->flags & BATADV_DIRECTLINK)) && |
345 | (batadv_ogm_packet->header.ttl != 1) && | |
b9dacc52 ML |
346 | |
347 | /* own packets originating non-primary | |
9cfc7bd6 SE |
348 | * interfaces leave only that interface |
349 | */ | |
b9dacc52 ML |
350 | ((!forw_packet->own) || |
351 | (forw_packet->if_incoming == primary_if))) { | |
352 | res = true; | |
353 | goto out; | |
354 | } | |
355 | ||
356 | /* if the incoming packet is sent via this one | |
9cfc7bd6 SE |
357 | * interface only - we still can aggregate |
358 | */ | |
b9dacc52 | 359 | if ((directlink) && |
fe8bc396 | 360 | (new_bat_ogm_packet->header.ttl == 1) && |
b9dacc52 ML |
361 | (forw_packet->if_incoming == if_incoming) && |
362 | ||
363 | /* packets from direct neighbors or | |
364 | * own secondary interface packets | |
9cfc7bd6 SE |
365 | * (= secondary interface packets in general) |
366 | */ | |
96412690 | 367 | (batadv_ogm_packet->flags & BATADV_DIRECTLINK || |
b9dacc52 ML |
368 | (forw_packet->own && |
369 | forw_packet->if_incoming != primary_if))) { | |
370 | res = true; | |
371 | goto out; | |
372 | } | |
373 | } | |
374 | ||
375 | out: | |
376 | if (primary_if) | |
e5d89254 | 377 | batadv_hardif_free_ref(primary_if); |
b9dacc52 ML |
378 | return res; |
379 | } | |
380 | ||
381 | /* create a new aggregated packet and add this packet to it */ | |
fe8bc396 SE |
382 | static void batadv_iv_ogm_aggregate_new(const unsigned char *packet_buff, |
383 | int packet_len, unsigned long send_time, | |
384 | bool direct_link, | |
56303d34 | 385 | struct batadv_hard_iface *if_incoming, |
fe8bc396 | 386 | int own_packet) |
b9dacc52 | 387 | { |
56303d34 SE |
388 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
389 | struct batadv_forw_packet *forw_packet_aggr; | |
b9dacc52 | 390 | unsigned char *skb_buff; |
42d0b044 | 391 | unsigned int skb_size; |
b9dacc52 ML |
392 | |
393 | if (!atomic_inc_not_zero(&if_incoming->refcount)) | |
394 | return; | |
395 | ||
396 | /* own packet should always be scheduled */ | |
397 | if (!own_packet) { | |
3e34819e | 398 | if (!batadv_atomic_dec_not_zero(&bat_priv->batman_queue_left)) { |
39c75a51 | 399 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 400 | "batman packet queue full\n"); |
b9dacc52 ML |
401 | goto out; |
402 | } | |
403 | } | |
404 | ||
405 | forw_packet_aggr = kmalloc(sizeof(*forw_packet_aggr), GFP_ATOMIC); | |
406 | if (!forw_packet_aggr) { | |
407 | if (!own_packet) | |
408 | atomic_inc(&bat_priv->batman_queue_left); | |
409 | goto out; | |
410 | } | |
411 | ||
412 | if ((atomic_read(&bat_priv->aggregated_ogms)) && | |
42d0b044 | 413 | (packet_len < BATADV_MAX_AGGREGATION_BYTES)) |
5b246574 | 414 | skb_size = BATADV_MAX_AGGREGATION_BYTES; |
b9dacc52 | 415 | else |
5b246574 SE |
416 | skb_size = packet_len; |
417 | ||
418 | skb_size += ETH_HLEN + NET_IP_ALIGN; | |
b9dacc52 | 419 | |
42d0b044 | 420 | forw_packet_aggr->skb = dev_alloc_skb(skb_size); |
b9dacc52 ML |
421 | if (!forw_packet_aggr->skb) { |
422 | if (!own_packet) | |
423 | atomic_inc(&bat_priv->batman_queue_left); | |
424 | kfree(forw_packet_aggr); | |
425 | goto out; | |
426 | } | |
5b246574 | 427 | skb_reserve(forw_packet_aggr->skb, ETH_HLEN + NET_IP_ALIGN); |
b9dacc52 ML |
428 | |
429 | INIT_HLIST_NODE(&forw_packet_aggr->list); | |
430 | ||
431 | skb_buff = skb_put(forw_packet_aggr->skb, packet_len); | |
432 | forw_packet_aggr->packet_len = packet_len; | |
433 | memcpy(skb_buff, packet_buff, packet_len); | |
434 | ||
435 | forw_packet_aggr->own = own_packet; | |
436 | forw_packet_aggr->if_incoming = if_incoming; | |
437 | forw_packet_aggr->num_packets = 0; | |
42d0b044 | 438 | forw_packet_aggr->direct_link_flags = BATADV_NO_FLAGS; |
b9dacc52 ML |
439 | forw_packet_aggr->send_time = send_time; |
440 | ||
441 | /* save packet direct link flag status */ | |
442 | if (direct_link) | |
443 | forw_packet_aggr->direct_link_flags |= 1; | |
444 | ||
445 | /* add new packet to packet list */ | |
446 | spin_lock_bh(&bat_priv->forw_bat_list_lock); | |
447 | hlist_add_head(&forw_packet_aggr->list, &bat_priv->forw_bat_list); | |
448 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); | |
449 | ||
450 | /* start timer for this packet */ | |
451 | INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work, | |
9455e34c | 452 | batadv_send_outstanding_bat_ogm_packet); |
3193e8fd | 453 | queue_delayed_work(batadv_event_workqueue, |
b9dacc52 ML |
454 | &forw_packet_aggr->delayed_work, |
455 | send_time - jiffies); | |
456 | ||
457 | return; | |
458 | out: | |
e5d89254 | 459 | batadv_hardif_free_ref(if_incoming); |
b9dacc52 ML |
460 | } |
461 | ||
462 | /* aggregate a new packet into the existing ogm packet */ | |
56303d34 | 463 | static void batadv_iv_ogm_aggregate(struct batadv_forw_packet *forw_packet_aggr, |
fe8bc396 SE |
464 | const unsigned char *packet_buff, |
465 | int packet_len, bool direct_link) | |
b9dacc52 ML |
466 | { |
467 | unsigned char *skb_buff; | |
8de47de5 | 468 | unsigned long new_direct_link_flag; |
b9dacc52 ML |
469 | |
470 | skb_buff = skb_put(forw_packet_aggr->skb, packet_len); | |
471 | memcpy(skb_buff, packet_buff, packet_len); | |
472 | forw_packet_aggr->packet_len += packet_len; | |
473 | forw_packet_aggr->num_packets++; | |
474 | ||
475 | /* save packet direct link flag status */ | |
8de47de5 SE |
476 | if (direct_link) { |
477 | new_direct_link_flag = BIT(forw_packet_aggr->num_packets); | |
478 | forw_packet_aggr->direct_link_flags |= new_direct_link_flag; | |
479 | } | |
b9dacc52 ML |
480 | } |
481 | ||
56303d34 | 482 | static void batadv_iv_ogm_queue_add(struct batadv_priv *bat_priv, |
fe8bc396 SE |
483 | unsigned char *packet_buff, |
484 | int packet_len, | |
56303d34 | 485 | struct batadv_hard_iface *if_incoming, |
fe8bc396 | 486 | int own_packet, unsigned long send_time) |
b9dacc52 | 487 | { |
9cfc7bd6 | 488 | /* _aggr -> pointer to the packet we want to aggregate with |
b9dacc52 ML |
489 | * _pos -> pointer to the position in the queue |
490 | */ | |
56303d34 SE |
491 | struct batadv_forw_packet *forw_packet_aggr = NULL; |
492 | struct batadv_forw_packet *forw_packet_pos = NULL; | |
b9dacc52 | 493 | struct hlist_node *tmp_node; |
96412690 | 494 | struct batadv_ogm_packet *batadv_ogm_packet; |
b9dacc52 | 495 | bool direct_link; |
42d0b044 | 496 | unsigned long max_aggregation_jiffies; |
b9dacc52 | 497 | |
96412690 SE |
498 | batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff; |
499 | direct_link = batadv_ogm_packet->flags & BATADV_DIRECTLINK ? 1 : 0; | |
42d0b044 | 500 | max_aggregation_jiffies = msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS); |
b9dacc52 ML |
501 | |
502 | /* find position for the packet in the forward queue */ | |
503 | spin_lock_bh(&bat_priv->forw_bat_list_lock); | |
504 | /* own packets are not to be aggregated */ | |
505 | if ((atomic_read(&bat_priv->aggregated_ogms)) && (!own_packet)) { | |
506 | hlist_for_each_entry(forw_packet_pos, tmp_node, | |
507 | &bat_priv->forw_bat_list, list) { | |
96412690 | 508 | if (batadv_iv_ogm_can_aggregate(batadv_ogm_packet, |
fe8bc396 SE |
509 | bat_priv, packet_len, |
510 | send_time, direct_link, | |
511 | if_incoming, | |
512 | forw_packet_pos)) { | |
b9dacc52 ML |
513 | forw_packet_aggr = forw_packet_pos; |
514 | break; | |
515 | } | |
516 | } | |
517 | } | |
518 | ||
519 | /* nothing to aggregate with - either aggregation disabled or no | |
9cfc7bd6 SE |
520 | * suitable aggregation packet found |
521 | */ | |
b9dacc52 ML |
522 | if (!forw_packet_aggr) { |
523 | /* the following section can run without the lock */ | |
524 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); | |
525 | ||
9cfc7bd6 | 526 | /* if we could not aggregate this packet with one of the others |
b9dacc52 ML |
527 | * we hold it back for a while, so that it might be aggregated |
528 | * later on | |
529 | */ | |
42d0b044 SE |
530 | if (!own_packet && atomic_read(&bat_priv->aggregated_ogms)) |
531 | send_time += max_aggregation_jiffies; | |
b9dacc52 | 532 | |
fe8bc396 SE |
533 | batadv_iv_ogm_aggregate_new(packet_buff, packet_len, |
534 | send_time, direct_link, | |
535 | if_incoming, own_packet); | |
b9dacc52 | 536 | } else { |
fe8bc396 SE |
537 | batadv_iv_ogm_aggregate(forw_packet_aggr, packet_buff, |
538 | packet_len, direct_link); | |
b9dacc52 ML |
539 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); |
540 | } | |
541 | } | |
542 | ||
56303d34 | 543 | static void batadv_iv_ogm_forward(struct batadv_orig_node *orig_node, |
fe8bc396 | 544 | const struct ethhdr *ethhdr, |
96412690 | 545 | struct batadv_ogm_packet *batadv_ogm_packet, |
fe8bc396 SE |
546 | bool is_single_hop_neigh, |
547 | bool is_from_best_next_hop, | |
56303d34 | 548 | struct batadv_hard_iface *if_incoming) |
b9dacc52 | 549 | { |
56303d34 | 550 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
b9dacc52 ML |
551 | uint8_t tt_num_changes; |
552 | ||
96412690 | 553 | if (batadv_ogm_packet->header.ttl <= 1) { |
39c75a51 | 554 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "ttl exceeded\n"); |
b9dacc52 ML |
555 | return; |
556 | } | |
557 | ||
13b2541b ML |
558 | if (!is_from_best_next_hop) { |
559 | /* Mark the forwarded packet when it is not coming from our | |
560 | * best next hop. We still need to forward the packet for our | |
561 | * neighbor link quality detection to work in case the packet | |
562 | * originated from a single hop neighbor. Otherwise we can | |
563 | * simply drop the ogm. | |
564 | */ | |
565 | if (is_single_hop_neigh) | |
96412690 | 566 | batadv_ogm_packet->flags |= BATADV_NOT_BEST_NEXT_HOP; |
13b2541b ML |
567 | else |
568 | return; | |
569 | } | |
b9dacc52 | 570 | |
96412690 | 571 | tt_num_changes = batadv_ogm_packet->tt_num_changes; |
b9dacc52 | 572 | |
96412690 SE |
573 | batadv_ogm_packet->header.ttl--; |
574 | memcpy(batadv_ogm_packet->prev_sender, ethhdr->h_source, ETH_ALEN); | |
b9dacc52 | 575 | |
b9dacc52 | 576 | /* apply hop penalty */ |
96412690 | 577 | batadv_ogm_packet->tq = batadv_hop_penalty(batadv_ogm_packet->tq, |
fe8bc396 | 578 | bat_priv); |
b9dacc52 | 579 | |
39c75a51 | 580 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 581 | "Forwarding packet: tq: %i, ttl: %i\n", |
96412690 | 582 | batadv_ogm_packet->tq, batadv_ogm_packet->header.ttl); |
b9dacc52 | 583 | |
b9dacc52 | 584 | /* switch of primaries first hop flag when forwarding */ |
96412690 | 585 | batadv_ogm_packet->flags &= ~BATADV_PRIMARIES_FIRST_HOP; |
75cd33f8 | 586 | if (is_single_hop_neigh) |
96412690 | 587 | batadv_ogm_packet->flags |= BATADV_DIRECTLINK; |
b9dacc52 | 588 | else |
96412690 | 589 | batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK; |
b9dacc52 | 590 | |
96412690 | 591 | batadv_iv_ogm_queue_add(bat_priv, (unsigned char *)batadv_ogm_packet, |
7e071c79 | 592 | BATADV_OGM_HLEN + batadv_tt_len(tt_num_changes), |
fe8bc396 | 593 | if_incoming, 0, batadv_iv_ogm_fwd_send_time()); |
b9dacc52 ML |
594 | } |
595 | ||
56303d34 | 596 | static void batadv_iv_ogm_schedule(struct batadv_hard_iface *hard_iface) |
b9dacc52 | 597 | { |
56303d34 | 598 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
14511519 | 599 | unsigned char **ogm_buff = &hard_iface->bat_iv.ogm_buff; |
96412690 | 600 | struct batadv_ogm_packet *batadv_ogm_packet; |
56303d34 | 601 | struct batadv_hard_iface *primary_if; |
14511519 | 602 | int *ogm_buff_len = &hard_iface->bat_iv.ogm_buff_len; |
be9aa4c1 | 603 | int vis_server, tt_num_changes = 0; |
bbb1f90e SE |
604 | uint32_t seqno; |
605 | uint8_t bandwidth; | |
b9dacc52 ML |
606 | |
607 | vis_server = atomic_read(&bat_priv->vis_mode); | |
e5d89254 | 608 | primary_if = batadv_primary_if_get_selected(bat_priv); |
b9dacc52 | 609 | |
be9aa4c1 | 610 | if (hard_iface == primary_if) |
14511519 ML |
611 | tt_num_changes = batadv_tt_append_diff(bat_priv, ogm_buff, |
612 | ogm_buff_len, | |
7e071c79 | 613 | BATADV_OGM_HLEN); |
be9aa4c1 | 614 | |
14511519 | 615 | batadv_ogm_packet = (struct batadv_ogm_packet *)(*ogm_buff); |
b9dacc52 ML |
616 | |
617 | /* change sequence number to network order */ | |
14511519 | 618 | seqno = (uint32_t)atomic_read(&hard_iface->bat_iv.ogm_seqno); |
bbb1f90e | 619 | batadv_ogm_packet->seqno = htonl(seqno); |
14511519 | 620 | atomic_inc(&hard_iface->bat_iv.ogm_seqno); |
b9dacc52 | 621 | |
807736f6 SE |
622 | batadv_ogm_packet->ttvn = atomic_read(&bat_priv->tt.vn); |
623 | batadv_ogm_packet->tt_crc = htons(bat_priv->tt.local_crc); | |
b9dacc52 | 624 | if (tt_num_changes >= 0) |
96412690 | 625 | batadv_ogm_packet->tt_num_changes = tt_num_changes; |
b9dacc52 | 626 | |
acd34afa | 627 | if (vis_server == BATADV_VIS_TYPE_SERVER_SYNC) |
96412690 | 628 | batadv_ogm_packet->flags |= BATADV_VIS_SERVER; |
b9dacc52 | 629 | else |
96412690 | 630 | batadv_ogm_packet->flags &= ~BATADV_VIS_SERVER; |
b9dacc52 | 631 | |
bbb1f90e SE |
632 | if (hard_iface == primary_if && |
633 | atomic_read(&bat_priv->gw_mode) == BATADV_GW_MODE_SERVER) { | |
634 | bandwidth = (uint8_t)atomic_read(&bat_priv->gw_bandwidth); | |
635 | batadv_ogm_packet->gw_flags = bandwidth; | |
636 | } else { | |
96412690 | 637 | batadv_ogm_packet->gw_flags = BATADV_NO_FLAGS; |
bbb1f90e | 638 | } |
b9dacc52 | 639 | |
30d3c511 | 640 | batadv_slide_own_bcast_window(hard_iface); |
14511519 ML |
641 | batadv_iv_ogm_queue_add(bat_priv, hard_iface->bat_iv.ogm_buff, |
642 | hard_iface->bat_iv.ogm_buff_len, hard_iface, 1, | |
fe8bc396 | 643 | batadv_iv_ogm_emit_send_time(bat_priv)); |
b9dacc52 ML |
644 | |
645 | if (primary_if) | |
e5d89254 | 646 | batadv_hardif_free_ref(primary_if); |
b9dacc52 ML |
647 | } |
648 | ||
fe8bc396 | 649 | static void |
56303d34 SE |
650 | batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv, |
651 | struct batadv_orig_node *orig_node, | |
fe8bc396 | 652 | const struct ethhdr *ethhdr, |
96412690 | 653 | const struct batadv_ogm_packet *batadv_ogm_packet, |
56303d34 | 654 | struct batadv_hard_iface *if_incoming, |
fe8bc396 SE |
655 | const unsigned char *tt_buff, |
656 | int is_duplicate) | |
fc957275 | 657 | { |
56303d34 SE |
658 | struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL; |
659 | struct batadv_neigh_node *router = NULL; | |
660 | struct batadv_orig_node *orig_node_tmp; | |
fc957275 | 661 | struct hlist_node *node; |
7caf69fb | 662 | int if_num; |
bbb1f90e | 663 | uint8_t sum_orig, sum_neigh; |
1eda58bf | 664 | uint8_t *neigh_addr; |
bbb1f90e | 665 | uint8_t tq_avg; |
fc957275 | 666 | |
39c75a51 | 667 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 668 | "update_originator(): Searching and updating originator entry of received packet\n"); |
fc957275 ML |
669 | |
670 | rcu_read_lock(); | |
671 | hlist_for_each_entry_rcu(tmp_neigh_node, node, | |
672 | &orig_node->neigh_list, list) { | |
1eda58bf SE |
673 | neigh_addr = tmp_neigh_node->addr; |
674 | if (batadv_compare_eth(neigh_addr, ethhdr->h_source) && | |
675 | tmp_neigh_node->if_incoming == if_incoming && | |
676 | atomic_inc_not_zero(&tmp_neigh_node->refcount)) { | |
fc957275 | 677 | if (neigh_node) |
7d211efc | 678 | batadv_neigh_node_free_ref(neigh_node); |
fc957275 ML |
679 | neigh_node = tmp_neigh_node; |
680 | continue; | |
681 | } | |
682 | ||
683 | if (is_duplicate) | |
684 | continue; | |
685 | ||
e3b0d0de | 686 | spin_lock_bh(&tmp_neigh_node->lq_update_lock); |
925a6672 SE |
687 | batadv_ring_buffer_set(tmp_neigh_node->tq_recv, |
688 | &tmp_neigh_node->tq_index, 0); | |
bbb1f90e SE |
689 | tq_avg = batadv_ring_buffer_avg(tmp_neigh_node->tq_recv); |
690 | tmp_neigh_node->tq_avg = tq_avg; | |
e3b0d0de | 691 | spin_unlock_bh(&tmp_neigh_node->lq_update_lock); |
fc957275 ML |
692 | } |
693 | ||
694 | if (!neigh_node) { | |
56303d34 | 695 | struct batadv_orig_node *orig_tmp; |
fc957275 | 696 | |
7d211efc | 697 | orig_tmp = batadv_get_orig_node(bat_priv, ethhdr->h_source); |
fc957275 ML |
698 | if (!orig_tmp) |
699 | goto unlock; | |
700 | ||
fe8bc396 SE |
701 | neigh_node = batadv_iv_ogm_neigh_new(if_incoming, |
702 | ethhdr->h_source, | |
703 | orig_node, orig_tmp, | |
96412690 | 704 | batadv_ogm_packet->seqno); |
fc957275 | 705 | |
7d211efc | 706 | batadv_orig_node_free_ref(orig_tmp); |
fc957275 ML |
707 | if (!neigh_node) |
708 | goto unlock; | |
709 | } else | |
39c75a51 | 710 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 711 | "Updating existing last-hop neighbor of originator\n"); |
fc957275 ML |
712 | |
713 | rcu_read_unlock(); | |
714 | ||
96412690 | 715 | orig_node->flags = batadv_ogm_packet->flags; |
d7b2a97e | 716 | neigh_node->last_seen = jiffies; |
fc957275 | 717 | |
e3b0d0de | 718 | spin_lock_bh(&neigh_node->lq_update_lock); |
925a6672 SE |
719 | batadv_ring_buffer_set(neigh_node->tq_recv, |
720 | &neigh_node->tq_index, | |
96412690 | 721 | batadv_ogm_packet->tq); |
925a6672 | 722 | neigh_node->tq_avg = batadv_ring_buffer_avg(neigh_node->tq_recv); |
e3b0d0de | 723 | spin_unlock_bh(&neigh_node->lq_update_lock); |
fc957275 ML |
724 | |
725 | if (!is_duplicate) { | |
96412690 SE |
726 | orig_node->last_ttl = batadv_ogm_packet->header.ttl; |
727 | neigh_node->last_ttl = batadv_ogm_packet->header.ttl; | |
fc957275 ML |
728 | } |
729 | ||
30d3c511 | 730 | batadv_bonding_candidate_add(orig_node, neigh_node); |
fc957275 ML |
731 | |
732 | /* if this neighbor already is our next hop there is nothing | |
9cfc7bd6 SE |
733 | * to change |
734 | */ | |
7d211efc | 735 | router = batadv_orig_node_get_router(orig_node); |
fc957275 ML |
736 | if (router == neigh_node) |
737 | goto update_tt; | |
738 | ||
739 | /* if this neighbor does not offer a better TQ we won't consider it */ | |
740 | if (router && (router->tq_avg > neigh_node->tq_avg)) | |
741 | goto update_tt; | |
742 | ||
743 | /* if the TQ is the same and the link not more symmetric we | |
9cfc7bd6 SE |
744 | * won't consider it either |
745 | */ | |
fc957275 ML |
746 | if (router && (neigh_node->tq_avg == router->tq_avg)) { |
747 | orig_node_tmp = router->orig_node; | |
748 | spin_lock_bh(&orig_node_tmp->ogm_cnt_lock); | |
7caf69fb LL |
749 | if_num = router->if_incoming->if_num; |
750 | sum_orig = orig_node_tmp->bcast_own_sum[if_num]; | |
fc957275 ML |
751 | spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock); |
752 | ||
753 | orig_node_tmp = neigh_node->orig_node; | |
754 | spin_lock_bh(&orig_node_tmp->ogm_cnt_lock); | |
7caf69fb LL |
755 | if_num = neigh_node->if_incoming->if_num; |
756 | sum_neigh = orig_node_tmp->bcast_own_sum[if_num]; | |
fc957275 ML |
757 | spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock); |
758 | ||
bbb1f90e | 759 | if (sum_orig >= sum_neigh) |
fc957275 ML |
760 | goto update_tt; |
761 | } | |
762 | ||
30d3c511 | 763 | batadv_update_route(bat_priv, orig_node, neigh_node); |
fc957275 ML |
764 | |
765 | update_tt: | |
766 | /* I have to check for transtable changes only if the OGM has been | |
9cfc7bd6 SE |
767 | * sent through a primary interface |
768 | */ | |
96412690 SE |
769 | if (((batadv_ogm_packet->orig != ethhdr->h_source) && |
770 | (batadv_ogm_packet->header.ttl > 2)) || | |
771 | (batadv_ogm_packet->flags & BATADV_PRIMARIES_FIRST_HOP)) | |
08c36d3e | 772 | batadv_tt_update_orig(bat_priv, orig_node, tt_buff, |
96412690 SE |
773 | batadv_ogm_packet->tt_num_changes, |
774 | batadv_ogm_packet->ttvn, | |
775 | ntohs(batadv_ogm_packet->tt_crc)); | |
fc957275 | 776 | |
96412690 | 777 | if (orig_node->gw_flags != batadv_ogm_packet->gw_flags) |
7cf06bc6 | 778 | batadv_gw_node_update(bat_priv, orig_node, |
96412690 | 779 | batadv_ogm_packet->gw_flags); |
fc957275 | 780 | |
96412690 | 781 | orig_node->gw_flags = batadv_ogm_packet->gw_flags; |
fc957275 ML |
782 | |
783 | /* restart gateway selection if fast or late switching was enabled */ | |
784 | if ((orig_node->gw_flags) && | |
cd646ab1 | 785 | (atomic_read(&bat_priv->gw_mode) == BATADV_GW_MODE_CLIENT) && |
fc957275 | 786 | (atomic_read(&bat_priv->gw_sel_class) > 2)) |
7cf06bc6 | 787 | batadv_gw_check_election(bat_priv, orig_node); |
fc957275 ML |
788 | |
789 | goto out; | |
790 | ||
791 | unlock: | |
792 | rcu_read_unlock(); | |
793 | out: | |
794 | if (neigh_node) | |
7d211efc | 795 | batadv_neigh_node_free_ref(neigh_node); |
fc957275 | 796 | if (router) |
7d211efc | 797 | batadv_neigh_node_free_ref(router); |
fc957275 ML |
798 | } |
799 | ||
56303d34 SE |
800 | static int batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node, |
801 | struct batadv_orig_node *orig_neigh_node, | |
96412690 | 802 | struct batadv_ogm_packet *batadv_ogm_packet, |
56303d34 | 803 | struct batadv_hard_iface *if_incoming) |
fc957275 | 804 | { |
56303d34 SE |
805 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
806 | struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node; | |
fc957275 ML |
807 | struct hlist_node *node; |
808 | uint8_t total_count; | |
42d0b044 SE |
809 | uint8_t orig_eq_count, neigh_rq_count, neigh_rq_inv, tq_own; |
810 | unsigned int neigh_rq_inv_cube, neigh_rq_max_cube; | |
811 | int tq_asym_penalty, inv_asym_penalty, ret = 0; | |
812 | unsigned int combined_tq; | |
fc957275 ML |
813 | |
814 | /* find corresponding one hop neighbor */ | |
815 | rcu_read_lock(); | |
816 | hlist_for_each_entry_rcu(tmp_neigh_node, node, | |
817 | &orig_neigh_node->neigh_list, list) { | |
818 | ||
1eda58bf SE |
819 | if (!batadv_compare_eth(tmp_neigh_node->addr, |
820 | orig_neigh_node->orig)) | |
fc957275 ML |
821 | continue; |
822 | ||
823 | if (tmp_neigh_node->if_incoming != if_incoming) | |
824 | continue; | |
825 | ||
826 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) | |
827 | continue; | |
828 | ||
829 | neigh_node = tmp_neigh_node; | |
830 | break; | |
831 | } | |
832 | rcu_read_unlock(); | |
833 | ||
834 | if (!neigh_node) | |
fe8bc396 SE |
835 | neigh_node = batadv_iv_ogm_neigh_new(if_incoming, |
836 | orig_neigh_node->orig, | |
837 | orig_neigh_node, | |
838 | orig_neigh_node, | |
96412690 | 839 | batadv_ogm_packet->seqno); |
fc957275 ML |
840 | |
841 | if (!neigh_node) | |
842 | goto out; | |
843 | ||
d7b2a97e | 844 | /* if orig_node is direct neighbor update neigh_node last_seen */ |
fc957275 | 845 | if (orig_node == orig_neigh_node) |
d7b2a97e | 846 | neigh_node->last_seen = jiffies; |
fc957275 | 847 | |
d7b2a97e | 848 | orig_node->last_seen = jiffies; |
fc957275 ML |
849 | |
850 | /* find packet count of corresponding one hop neighbor */ | |
851 | spin_lock_bh(&orig_node->ogm_cnt_lock); | |
852 | orig_eq_count = orig_neigh_node->bcast_own_sum[if_incoming->if_num]; | |
853 | neigh_rq_count = neigh_node->real_packet_count; | |
854 | spin_unlock_bh(&orig_node->ogm_cnt_lock); | |
855 | ||
856 | /* pay attention to not get a value bigger than 100 % */ | |
c67893d1 SE |
857 | if (orig_eq_count > neigh_rq_count) |
858 | total_count = neigh_rq_count; | |
859 | else | |
860 | total_count = orig_eq_count; | |
fc957275 | 861 | |
9cfc7bd6 SE |
862 | /* if we have too few packets (too less data) we set tq_own to zero |
863 | * if we receive too few packets it is not considered bidirectional | |
864 | */ | |
42d0b044 SE |
865 | if (total_count < BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM || |
866 | neigh_rq_count < BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM) | |
fc957275 ML |
867 | tq_own = 0; |
868 | else | |
869 | /* neigh_node->real_packet_count is never zero as we | |
870 | * only purge old information when getting new | |
9cfc7bd6 SE |
871 | * information |
872 | */ | |
42d0b044 | 873 | tq_own = (BATADV_TQ_MAX_VALUE * total_count) / neigh_rq_count; |
fc957275 | 874 | |
21a1236b | 875 | /* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does |
fc957275 ML |
876 | * affect the nearly-symmetric links only a little, but |
877 | * punishes asymmetric links more. This will give a value | |
878 | * between 0 and TQ_MAX_VALUE | |
879 | */ | |
42d0b044 SE |
880 | neigh_rq_inv = BATADV_TQ_LOCAL_WINDOW_SIZE - neigh_rq_count; |
881 | neigh_rq_inv_cube = neigh_rq_inv * neigh_rq_inv * neigh_rq_inv; | |
882 | neigh_rq_max_cube = BATADV_TQ_LOCAL_WINDOW_SIZE * | |
883 | BATADV_TQ_LOCAL_WINDOW_SIZE * | |
884 | BATADV_TQ_LOCAL_WINDOW_SIZE; | |
885 | inv_asym_penalty = BATADV_TQ_MAX_VALUE * neigh_rq_inv_cube; | |
886 | inv_asym_penalty /= neigh_rq_max_cube; | |
887 | tq_asym_penalty = BATADV_TQ_MAX_VALUE - inv_asym_penalty; | |
888 | ||
96412690 | 889 | combined_tq = batadv_ogm_packet->tq * tq_own * tq_asym_penalty; |
42d0b044 | 890 | combined_tq /= BATADV_TQ_MAX_VALUE * BATADV_TQ_MAX_VALUE; |
96412690 | 891 | batadv_ogm_packet->tq = combined_tq; |
fc957275 | 892 | |
39c75a51 | 893 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
894 | "bidirectional: orig = %-15pM neigh = %-15pM => own_bcast = %2i, real recv = %2i, local tq: %3i, asym_penalty: %3i, total tq: %3i\n", |
895 | orig_node->orig, orig_neigh_node->orig, total_count, | |
896 | neigh_rq_count, tq_own, | |
96412690 | 897 | tq_asym_penalty, batadv_ogm_packet->tq); |
fc957275 ML |
898 | |
899 | /* if link has the minimum required transmission quality | |
9cfc7bd6 SE |
900 | * consider it bidirectional |
901 | */ | |
96412690 | 902 | if (batadv_ogm_packet->tq >= BATADV_TQ_TOTAL_BIDRECT_LIMIT) |
fc957275 ML |
903 | ret = 1; |
904 | ||
905 | out: | |
906 | if (neigh_node) | |
7d211efc | 907 | batadv_neigh_node_free_ref(neigh_node); |
fc957275 ML |
908 | return ret; |
909 | } | |
910 | ||
911 | /* processes a batman packet for all interfaces, adjusts the sequence number and | |
912 | * finds out whether it is a duplicate. | |
913 | * returns: | |
914 | * 1 the packet is a duplicate | |
915 | * 0 the packet has not yet been received | |
916 | * -1 the packet is old and has been received while the seqno window | |
917 | * was protected. Caller should drop it. | |
918 | */ | |
fe8bc396 SE |
919 | static int |
920 | batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr, | |
96412690 | 921 | const struct batadv_ogm_packet *batadv_ogm_packet, |
56303d34 | 922 | const struct batadv_hard_iface *if_incoming) |
fc957275 | 923 | { |
56303d34 SE |
924 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
925 | struct batadv_orig_node *orig_node; | |
926 | struct batadv_neigh_node *tmp_neigh_node; | |
fc957275 ML |
927 | struct hlist_node *node; |
928 | int is_duplicate = 0; | |
929 | int32_t seq_diff; | |
930 | int need_update = 0; | |
931 | int set_mark, ret = -1; | |
96412690 | 932 | uint32_t seqno = ntohl(batadv_ogm_packet->seqno); |
1eda58bf | 933 | uint8_t *neigh_addr; |
bbb1f90e | 934 | uint8_t packet_count; |
fc957275 | 935 | |
96412690 | 936 | orig_node = batadv_get_orig_node(bat_priv, batadv_ogm_packet->orig); |
fc957275 ML |
937 | if (!orig_node) |
938 | return 0; | |
939 | ||
940 | spin_lock_bh(&orig_node->ogm_cnt_lock); | |
e0f5211f | 941 | seq_diff = seqno - orig_node->last_real_seqno; |
fc957275 ML |
942 | |
943 | /* signalize caller that the packet is to be dropped. */ | |
1e5cc266 | 944 | if (!hlist_empty(&orig_node->neigh_list) && |
30d3c511 SE |
945 | batadv_window_protected(bat_priv, seq_diff, |
946 | &orig_node->batman_seqno_reset)) | |
fc957275 ML |
947 | goto out; |
948 | ||
949 | rcu_read_lock(); | |
950 | hlist_for_each_entry_rcu(tmp_neigh_node, node, | |
951 | &orig_node->neigh_list, list) { | |
952 | ||
9b4a1159 SE |
953 | is_duplicate |= batadv_test_bit(tmp_neigh_node->real_bits, |
954 | orig_node->last_real_seqno, | |
955 | seqno); | |
fc957275 | 956 | |
1eda58bf SE |
957 | neigh_addr = tmp_neigh_node->addr; |
958 | if (batadv_compare_eth(neigh_addr, ethhdr->h_source) && | |
959 | tmp_neigh_node->if_incoming == if_incoming) | |
fc957275 ML |
960 | set_mark = 1; |
961 | else | |
962 | set_mark = 0; | |
963 | ||
964 | /* if the window moved, set the update flag. */ | |
0f5f9322 SE |
965 | need_update |= batadv_bit_get_packet(bat_priv, |
966 | tmp_neigh_node->real_bits, | |
967 | seq_diff, set_mark); | |
fc957275 | 968 | |
bbb1f90e SE |
969 | packet_count = bitmap_weight(tmp_neigh_node->real_bits, |
970 | BATADV_TQ_LOCAL_WINDOW_SIZE); | |
971 | tmp_neigh_node->real_packet_count = packet_count; | |
fc957275 ML |
972 | } |
973 | rcu_read_unlock(); | |
974 | ||
975 | if (need_update) { | |
39c75a51 | 976 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
977 | "updating last_seqno: old %u, new %u\n", |
978 | orig_node->last_real_seqno, seqno); | |
e0f5211f | 979 | orig_node->last_real_seqno = seqno; |
fc957275 ML |
980 | } |
981 | ||
982 | ret = is_duplicate; | |
983 | ||
984 | out: | |
985 | spin_unlock_bh(&orig_node->ogm_cnt_lock); | |
7d211efc | 986 | batadv_orig_node_free_ref(orig_node); |
fc957275 ML |
987 | return ret; |
988 | } | |
989 | ||
fe8bc396 | 990 | static void batadv_iv_ogm_process(const struct ethhdr *ethhdr, |
96412690 | 991 | struct batadv_ogm_packet *batadv_ogm_packet, |
fe8bc396 | 992 | const unsigned char *tt_buff, |
56303d34 | 993 | struct batadv_hard_iface *if_incoming) |
fc957275 | 994 | { |
56303d34 SE |
995 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
996 | struct batadv_hard_iface *hard_iface; | |
997 | struct batadv_orig_node *orig_neigh_node, *orig_node; | |
998 | struct batadv_neigh_node *router = NULL, *router_router = NULL; | |
999 | struct batadv_neigh_node *orig_neigh_router = NULL; | |
fc957275 ML |
1000 | int has_directlink_flag; |
1001 | int is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0; | |
fe8bc396 | 1002 | int is_broadcast = 0, is_bidirect; |
75cd33f8 | 1003 | bool is_single_hop_neigh = false; |
13b2541b | 1004 | bool is_from_best_next_hop = false; |
fe8bc396 | 1005 | int is_duplicate, sameseq, simlar_ttl; |
fc957275 | 1006 | uint32_t if_incoming_seqno; |
1eda58bf | 1007 | uint8_t *prev_sender; |
fc957275 ML |
1008 | |
1009 | /* Silently drop when the batman packet is actually not a | |
1010 | * correct packet. | |
1011 | * | |
1012 | * This might happen if a packet is padded (e.g. Ethernet has a | |
1013 | * minimum frame length of 64 byte) and the aggregation interprets | |
1014 | * it as an additional length. | |
1015 | * | |
1016 | * TODO: A more sane solution would be to have a bit in the | |
96412690 | 1017 | * batadv_ogm_packet to detect whether the packet is the last |
fc957275 ML |
1018 | * packet in an aggregation. Here we expect that the padding |
1019 | * is always zero (or not 0x01) | |
1020 | */ | |
96412690 | 1021 | if (batadv_ogm_packet->header.packet_type != BATADV_IV_OGM) |
fc957275 ML |
1022 | return; |
1023 | ||
1024 | /* could be changed by schedule_own_packet() */ | |
14511519 | 1025 | if_incoming_seqno = atomic_read(&if_incoming->bat_iv.ogm_seqno); |
fc957275 | 1026 | |
96412690 | 1027 | if (batadv_ogm_packet->flags & BATADV_DIRECTLINK) |
acd34afa SE |
1028 | has_directlink_flag = 1; |
1029 | else | |
1030 | has_directlink_flag = 0; | |
fc957275 | 1031 | |
96412690 | 1032 | if (batadv_compare_eth(ethhdr->h_source, batadv_ogm_packet->orig)) |
75cd33f8 | 1033 | is_single_hop_neigh = true; |
fc957275 | 1034 | |
39c75a51 | 1035 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
1036 | "Received BATMAN packet via NB: %pM, IF: %s [%pM] (from OG: %pM, via prev OG: %pM, seqno %u, ttvn %u, crc %u, changes %u, td %d, TTL %d, V %d, IDF %d)\n", |
1037 | ethhdr->h_source, if_incoming->net_dev->name, | |
96412690 SE |
1038 | if_incoming->net_dev->dev_addr, batadv_ogm_packet->orig, |
1039 | batadv_ogm_packet->prev_sender, | |
1040 | ntohl(batadv_ogm_packet->seqno), batadv_ogm_packet->ttvn, | |
1041 | ntohs(batadv_ogm_packet->tt_crc), | |
1042 | batadv_ogm_packet->tt_num_changes, batadv_ogm_packet->tq, | |
1043 | batadv_ogm_packet->header.ttl, | |
1044 | batadv_ogm_packet->header.version, has_directlink_flag); | |
fc957275 ML |
1045 | |
1046 | rcu_read_lock(); | |
3193e8fd | 1047 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e9a4f295 | 1048 | if (hard_iface->if_status != BATADV_IF_ACTIVE) |
fc957275 ML |
1049 | continue; |
1050 | ||
1051 | if (hard_iface->soft_iface != if_incoming->soft_iface) | |
1052 | continue; | |
1053 | ||
1eda58bf SE |
1054 | if (batadv_compare_eth(ethhdr->h_source, |
1055 | hard_iface->net_dev->dev_addr)) | |
fc957275 ML |
1056 | is_my_addr = 1; |
1057 | ||
96412690 | 1058 | if (batadv_compare_eth(batadv_ogm_packet->orig, |
1eda58bf | 1059 | hard_iface->net_dev->dev_addr)) |
fc957275 ML |
1060 | is_my_orig = 1; |
1061 | ||
96412690 | 1062 | if (batadv_compare_eth(batadv_ogm_packet->prev_sender, |
1eda58bf | 1063 | hard_iface->net_dev->dev_addr)) |
fc957275 ML |
1064 | is_my_oldorig = 1; |
1065 | ||
1066 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
1067 | is_broadcast = 1; | |
1068 | } | |
1069 | rcu_read_unlock(); | |
1070 | ||
96412690 | 1071 | if (batadv_ogm_packet->header.version != BATADV_COMPAT_VERSION) { |
39c75a51 | 1072 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1073 | "Drop packet: incompatible batman version (%i)\n", |
96412690 | 1074 | batadv_ogm_packet->header.version); |
fc957275 ML |
1075 | return; |
1076 | } | |
1077 | ||
1078 | if (is_my_addr) { | |
39c75a51 | 1079 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
1080 | "Drop packet: received my own broadcast (sender: %pM)\n", |
1081 | ethhdr->h_source); | |
fc957275 ML |
1082 | return; |
1083 | } | |
1084 | ||
1085 | if (is_broadcast) { | |
39c75a51 | 1086 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
1087 | "Drop packet: ignoring all packets with broadcast source addr (sender: %pM)\n", |
1088 | ethhdr->h_source); | |
fc957275 ML |
1089 | return; |
1090 | } | |
1091 | ||
1092 | if (is_my_orig) { | |
1093 | unsigned long *word; | |
1094 | int offset; | |
9b4a1159 | 1095 | int32_t bit_pos; |
42d0b044 SE |
1096 | int16_t if_num; |
1097 | uint8_t *weight; | |
fc957275 | 1098 | |
7d211efc SE |
1099 | orig_neigh_node = batadv_get_orig_node(bat_priv, |
1100 | ethhdr->h_source); | |
fc957275 ML |
1101 | if (!orig_neigh_node) |
1102 | return; | |
1103 | ||
1104 | /* neighbor has to indicate direct link and it has to | |
9cfc7bd6 SE |
1105 | * come via the corresponding interface |
1106 | * save packet seqno for bidirectional check | |
1107 | */ | |
fc957275 | 1108 | if (has_directlink_flag && |
1eda58bf | 1109 | batadv_compare_eth(if_incoming->net_dev->dev_addr, |
96412690 | 1110 | batadv_ogm_packet->orig)) { |
42d0b044 SE |
1111 | if_num = if_incoming->if_num; |
1112 | offset = if_num * BATADV_NUM_WORDS; | |
fc957275 ML |
1113 | |
1114 | spin_lock_bh(&orig_neigh_node->ogm_cnt_lock); | |
1115 | word = &(orig_neigh_node->bcast_own[offset]); | |
9b4a1159 | 1116 | bit_pos = if_incoming_seqno - 2; |
96412690 | 1117 | bit_pos -= ntohl(batadv_ogm_packet->seqno); |
9b4a1159 | 1118 | batadv_set_bit(word, bit_pos); |
42d0b044 SE |
1119 | weight = &orig_neigh_node->bcast_own_sum[if_num]; |
1120 | *weight = bitmap_weight(word, | |
1121 | BATADV_TQ_LOCAL_WINDOW_SIZE); | |
fc957275 ML |
1122 | spin_unlock_bh(&orig_neigh_node->ogm_cnt_lock); |
1123 | } | |
1124 | ||
39c75a51 | 1125 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1126 | "Drop packet: originator packet from myself (via neighbor)\n"); |
7d211efc | 1127 | batadv_orig_node_free_ref(orig_neigh_node); |
fc957275 ML |
1128 | return; |
1129 | } | |
1130 | ||
1131 | if (is_my_oldorig) { | |
39c75a51 | 1132 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
1133 | "Drop packet: ignoring all rebroadcast echos (sender: %pM)\n", |
1134 | ethhdr->h_source); | |
fc957275 ML |
1135 | return; |
1136 | } | |
1137 | ||
96412690 | 1138 | if (batadv_ogm_packet->flags & BATADV_NOT_BEST_NEXT_HOP) { |
39c75a51 | 1139 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
1140 | "Drop packet: ignoring all packets not forwarded from the best next hop (sender: %pM)\n", |
1141 | ethhdr->h_source); | |
13b2541b ML |
1142 | return; |
1143 | } | |
1144 | ||
96412690 | 1145 | orig_node = batadv_get_orig_node(bat_priv, batadv_ogm_packet->orig); |
fc957275 ML |
1146 | if (!orig_node) |
1147 | return; | |
1148 | ||
96412690 | 1149 | is_duplicate = batadv_iv_ogm_update_seqnos(ethhdr, batadv_ogm_packet, |
fe8bc396 | 1150 | if_incoming); |
fc957275 ML |
1151 | |
1152 | if (is_duplicate == -1) { | |
39c75a51 | 1153 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
1154 | "Drop packet: packet within seqno protection time (sender: %pM)\n", |
1155 | ethhdr->h_source); | |
fc957275 ML |
1156 | goto out; |
1157 | } | |
1158 | ||
96412690 | 1159 | if (batadv_ogm_packet->tq == 0) { |
39c75a51 | 1160 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1161 | "Drop packet: originator packet with tq equal 0\n"); |
fc957275 ML |
1162 | goto out; |
1163 | } | |
1164 | ||
7d211efc | 1165 | router = batadv_orig_node_get_router(orig_node); |
fc957275 | 1166 | if (router) |
7d211efc | 1167 | router_router = batadv_orig_node_get_router(router->orig_node); |
fc957275 | 1168 | |
13b2541b | 1169 | if ((router && router->tq_avg != 0) && |
1eda58bf | 1170 | (batadv_compare_eth(router->addr, ethhdr->h_source))) |
13b2541b ML |
1171 | is_from_best_next_hop = true; |
1172 | ||
96412690 | 1173 | prev_sender = batadv_ogm_packet->prev_sender; |
fc957275 ML |
1174 | /* avoid temporary routing loops */ |
1175 | if (router && router_router && | |
1eda58bf | 1176 | (batadv_compare_eth(router->addr, prev_sender)) && |
96412690 | 1177 | !(batadv_compare_eth(batadv_ogm_packet->orig, prev_sender)) && |
1eda58bf | 1178 | (batadv_compare_eth(router->addr, router_router->addr))) { |
39c75a51 | 1179 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
1180 | "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n", |
1181 | ethhdr->h_source); | |
fc957275 ML |
1182 | goto out; |
1183 | } | |
1184 | ||
1185 | /* if sender is a direct neighbor the sender mac equals | |
9cfc7bd6 SE |
1186 | * originator mac |
1187 | */ | |
c67893d1 SE |
1188 | if (is_single_hop_neigh) |
1189 | orig_neigh_node = orig_node; | |
1190 | else | |
1191 | orig_neigh_node = batadv_get_orig_node(bat_priv, | |
1192 | ethhdr->h_source); | |
1193 | ||
fc957275 ML |
1194 | if (!orig_neigh_node) |
1195 | goto out; | |
1196 | ||
7d211efc | 1197 | orig_neigh_router = batadv_orig_node_get_router(orig_neigh_node); |
fc957275 ML |
1198 | |
1199 | /* drop packet if sender is not a direct neighbor and if we | |
9cfc7bd6 SE |
1200 | * don't route towards it |
1201 | */ | |
fc957275 | 1202 | if (!is_single_hop_neigh && (!orig_neigh_router)) { |
39c75a51 | 1203 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1204 | "Drop packet: OGM via unknown neighbor!\n"); |
fc957275 ML |
1205 | goto out_neigh; |
1206 | } | |
1207 | ||
fe8bc396 | 1208 | is_bidirect = batadv_iv_ogm_calc_tq(orig_node, orig_neigh_node, |
96412690 | 1209 | batadv_ogm_packet, if_incoming); |
fc957275 | 1210 | |
30d3c511 | 1211 | batadv_bonding_save_primary(orig_node, orig_neigh_node, |
96412690 | 1212 | batadv_ogm_packet); |
fc957275 ML |
1213 | |
1214 | /* update ranking if it is not a duplicate or has the same | |
9cfc7bd6 SE |
1215 | * seqno and similar ttl as the non-duplicate |
1216 | */ | |
96412690 SE |
1217 | sameseq = orig_node->last_real_seqno == ntohl(batadv_ogm_packet->seqno); |
1218 | simlar_ttl = orig_node->last_ttl - 3 <= batadv_ogm_packet->header.ttl; | |
fe8bc396 SE |
1219 | if (is_bidirect && (!is_duplicate || (sameseq && simlar_ttl))) |
1220 | batadv_iv_ogm_orig_update(bat_priv, orig_node, ethhdr, | |
96412690 | 1221 | batadv_ogm_packet, if_incoming, |
fe8bc396 | 1222 | tt_buff, is_duplicate); |
fc957275 ML |
1223 | |
1224 | /* is single hop (direct) neighbor */ | |
1225 | if (is_single_hop_neigh) { | |
1226 | ||
1227 | /* mark direct link on incoming interface */ | |
96412690 | 1228 | batadv_iv_ogm_forward(orig_node, ethhdr, batadv_ogm_packet, |
fe8bc396 SE |
1229 | is_single_hop_neigh, |
1230 | is_from_best_next_hop, if_incoming); | |
fc957275 | 1231 | |
39c75a51 | 1232 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1233 | "Forwarding packet: rebroadcast neighbor packet with direct link flag\n"); |
fc957275 ML |
1234 | goto out_neigh; |
1235 | } | |
1236 | ||
1237 | /* multihop originator */ | |
fe8bc396 | 1238 | if (!is_bidirect) { |
39c75a51 | 1239 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1240 | "Drop packet: not received via bidirectional link\n"); |
fc957275 ML |
1241 | goto out_neigh; |
1242 | } | |
1243 | ||
1244 | if (is_duplicate) { | |
39c75a51 | 1245 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1246 | "Drop packet: duplicate packet received\n"); |
fc957275 ML |
1247 | goto out_neigh; |
1248 | } | |
1249 | ||
39c75a51 | 1250 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1251 | "Forwarding packet: rebroadcast originator packet\n"); |
96412690 | 1252 | batadv_iv_ogm_forward(orig_node, ethhdr, batadv_ogm_packet, |
fe8bc396 SE |
1253 | is_single_hop_neigh, is_from_best_next_hop, |
1254 | if_incoming); | |
fc957275 ML |
1255 | |
1256 | out_neigh: | |
1257 | if ((orig_neigh_node) && (!is_single_hop_neigh)) | |
7d211efc | 1258 | batadv_orig_node_free_ref(orig_neigh_node); |
fc957275 ML |
1259 | out: |
1260 | if (router) | |
7d211efc | 1261 | batadv_neigh_node_free_ref(router); |
fc957275 | 1262 | if (router_router) |
7d211efc | 1263 | batadv_neigh_node_free_ref(router_router); |
fc957275 | 1264 | if (orig_neigh_router) |
7d211efc | 1265 | batadv_neigh_node_free_ref(orig_neigh_router); |
fc957275 | 1266 | |
7d211efc | 1267 | batadv_orig_node_free_ref(orig_node); |
fc957275 ML |
1268 | } |
1269 | ||
fe8bc396 | 1270 | static int batadv_iv_ogm_receive(struct sk_buff *skb, |
56303d34 | 1271 | struct batadv_hard_iface *if_incoming) |
fc957275 | 1272 | { |
56303d34 | 1273 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
96412690 | 1274 | struct batadv_ogm_packet *batadv_ogm_packet; |
8780dad9 ML |
1275 | struct ethhdr *ethhdr; |
1276 | int buff_pos = 0, packet_len; | |
1277 | unsigned char *tt_buff, *packet_buff; | |
c3e29312 | 1278 | bool ret; |
c67893d1 | 1279 | uint8_t *packet_pos; |
c3e29312 | 1280 | |
7e071c79 | 1281 | ret = batadv_check_management_packet(skb, if_incoming, BATADV_OGM_HLEN); |
c3e29312 ML |
1282 | if (!ret) |
1283 | return NET_RX_DROP; | |
fc957275 | 1284 | |
edbf12ba ML |
1285 | /* did we receive a B.A.T.M.A.N. IV OGM packet on an interface |
1286 | * that does not have B.A.T.M.A.N. IV enabled ? | |
1287 | */ | |
fe8bc396 | 1288 | if (bat_priv->bat_algo_ops->bat_ogm_emit != batadv_iv_ogm_emit) |
edbf12ba ML |
1289 | return NET_RX_DROP; |
1290 | ||
d69909d2 SE |
1291 | batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX); |
1292 | batadv_add_counter(bat_priv, BATADV_CNT_MGMT_RX_BYTES, | |
f8214865 MH |
1293 | skb->len + ETH_HLEN); |
1294 | ||
8780dad9 ML |
1295 | packet_len = skb_headlen(skb); |
1296 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
1297 | packet_buff = skb->data; | |
96412690 | 1298 | batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff; |
fc957275 ML |
1299 | |
1300 | /* unpack the aggregated packets and process them one by one */ | |
1301 | do { | |
7e071c79 | 1302 | tt_buff = packet_buff + buff_pos + BATADV_OGM_HLEN; |
fc957275 | 1303 | |
96412690 | 1304 | batadv_iv_ogm_process(ethhdr, batadv_ogm_packet, tt_buff, |
fe8bc396 | 1305 | if_incoming); |
fc957275 | 1306 | |
7e071c79 | 1307 | buff_pos += BATADV_OGM_HLEN; |
96412690 | 1308 | buff_pos += batadv_tt_len(batadv_ogm_packet->tt_num_changes); |
fc957275 | 1309 | |
c67893d1 SE |
1310 | packet_pos = packet_buff + buff_pos; |
1311 | batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos; | |
fe8bc396 | 1312 | } while (batadv_iv_ogm_aggr_packet(buff_pos, packet_len, |
96412690 | 1313 | batadv_ogm_packet->tt_num_changes)); |
c3e29312 ML |
1314 | |
1315 | kfree_skb(skb); | |
1316 | return NET_RX_SUCCESS; | |
fc957275 | 1317 | } |
1c280471 | 1318 | |
56303d34 | 1319 | static struct batadv_algo_ops batadv_batman_iv __read_mostly = { |
519d3497 | 1320 | .name = "BATMAN_IV", |
fe8bc396 SE |
1321 | .bat_iface_enable = batadv_iv_ogm_iface_enable, |
1322 | .bat_iface_disable = batadv_iv_ogm_iface_disable, | |
1323 | .bat_iface_update_mac = batadv_iv_ogm_iface_update_mac, | |
1324 | .bat_primary_iface_set = batadv_iv_ogm_primary_iface_set, | |
1325 | .bat_ogm_schedule = batadv_iv_ogm_schedule, | |
1326 | .bat_ogm_emit = batadv_iv_ogm_emit, | |
1c280471 ML |
1327 | }; |
1328 | ||
81c524f7 | 1329 | int __init batadv_iv_init(void) |
1c280471 | 1330 | { |
c3e29312 ML |
1331 | int ret; |
1332 | ||
1333 | /* batman originator packet */ | |
acd34afa SE |
1334 | ret = batadv_recv_handler_register(BATADV_IV_OGM, |
1335 | batadv_iv_ogm_receive); | |
c3e29312 ML |
1336 | if (ret < 0) |
1337 | goto out; | |
1338 | ||
fe8bc396 | 1339 | ret = batadv_algo_register(&batadv_batman_iv); |
c3e29312 ML |
1340 | if (ret < 0) |
1341 | goto handler_unregister; | |
1342 | ||
1343 | goto out; | |
1344 | ||
1345 | handler_unregister: | |
acd34afa | 1346 | batadv_recv_handler_unregister(BATADV_IV_OGM); |
c3e29312 ML |
1347 | out: |
1348 | return ret; | |
1c280471 | 1349 | } |