Commit | Line | Data |
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0b873931 | 1 | /* Copyright (C) 2007-2013 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 | 21 | #include "translation-table.h" |
fc957275 ML |
22 | #include "originator.h" |
23 | #include "routing.h" | |
24 | #include "gateway_common.h" | |
25 | #include "gateway_client.h" | |
26 | #include "hard-interface.h" | |
27 | #include "send.h" | |
1c280471 | 28 | #include "bat_algo.h" |
d56b1705 | 29 | #include "network-coding.h" |
fc957275 | 30 | |
24a5deeb AQ |
31 | /** |
32 | * batadv_ring_buffer_set - update the ring buffer with the given value | |
33 | * @lq_recv: pointer to the ring buffer | |
34 | * @lq_index: index to store the value at | |
35 | * @value: value to store in the ring buffer | |
36 | */ | |
37 | static void batadv_ring_buffer_set(uint8_t lq_recv[], uint8_t *lq_index, | |
38 | uint8_t value) | |
39 | { | |
40 | lq_recv[*lq_index] = value; | |
41 | *lq_index = (*lq_index + 1) % BATADV_TQ_GLOBAL_WINDOW_SIZE; | |
42 | } | |
43 | ||
44 | /** | |
45 | * batadv_ring_buffer_set - compute the average of all non-zero values stored | |
46 | * in the given ring buffer | |
47 | * @lq_recv: pointer to the ring buffer | |
48 | * | |
49 | * Returns computed average value. | |
50 | */ | |
51 | static uint8_t batadv_ring_buffer_avg(const uint8_t lq_recv[]) | |
52 | { | |
53 | const uint8_t *ptr; | |
54 | uint16_t count = 0, i = 0, sum = 0; | |
55 | ||
56 | ptr = lq_recv; | |
57 | ||
58 | while (i < BATADV_TQ_GLOBAL_WINDOW_SIZE) { | |
59 | if (*ptr != 0) { | |
60 | count++; | |
61 | sum += *ptr; | |
62 | } | |
63 | ||
64 | i++; | |
65 | ptr++; | |
66 | } | |
67 | ||
68 | if (count == 0) | |
69 | return 0; | |
70 | ||
71 | return (uint8_t)(sum / count); | |
72 | } | |
d98cae64 DM |
73 | |
74 | /* | |
7c24bbbe SW |
75 | * batadv_dup_status - duplicate status |
76 | * @BATADV_NO_DUP: the packet is a duplicate | |
77 | * @BATADV_ORIG_DUP: OGM is a duplicate in the originator (but not for the | |
78 | * neighbor) | |
79 | * @BATADV_NEIGH_DUP: OGM is a duplicate for the neighbor | |
80 | * @BATADV_PROTECTED: originator is currently protected (after reboot) | |
81 | */ | |
82 | enum batadv_dup_status { | |
83 | BATADV_NO_DUP = 0, | |
84 | BATADV_ORIG_DUP, | |
85 | BATADV_NEIGH_DUP, | |
86 | BATADV_PROTECTED, | |
87 | }; | |
88 | ||
56303d34 SE |
89 | static struct batadv_neigh_node * |
90 | batadv_iv_ogm_neigh_new(struct batadv_hard_iface *hard_iface, | |
91 | const uint8_t *neigh_addr, | |
92 | struct batadv_orig_node *orig_node, | |
863dd7a8 | 93 | struct batadv_orig_node *orig_neigh) |
7ae8b285 | 94 | { |
56303d34 | 95 | struct batadv_neigh_node *neigh_node; |
7ae8b285 | 96 | |
863dd7a8 | 97 | neigh_node = batadv_neigh_node_new(hard_iface, neigh_addr); |
7ae8b285 ML |
98 | if (!neigh_node) |
99 | goto out; | |
100 | ||
101 | INIT_LIST_HEAD(&neigh_node->bonding_list); | |
7ae8b285 ML |
102 | |
103 | neigh_node->orig_node = orig_neigh; | |
104 | neigh_node->if_incoming = hard_iface; | |
105 | ||
106 | spin_lock_bh(&orig_node->neigh_list_lock); | |
107 | hlist_add_head_rcu(&neigh_node->list, &orig_node->neigh_list); | |
108 | spin_unlock_bh(&orig_node->neigh_list_lock); | |
109 | ||
110 | out: | |
111 | return neigh_node; | |
112 | } | |
113 | ||
56303d34 | 114 | static int batadv_iv_ogm_iface_enable(struct batadv_hard_iface *hard_iface) |
d0b9fd89 | 115 | { |
96412690 | 116 | struct batadv_ogm_packet *batadv_ogm_packet; |
14511519 | 117 | unsigned char *ogm_buff; |
d7d32ec0 | 118 | uint32_t random_seqno; |
5346c35e | 119 | int res = -ENOMEM; |
d7d32ec0 ML |
120 | |
121 | /* randomize initial seqno to avoid collision */ | |
122 | get_random_bytes(&random_seqno, sizeof(random_seqno)); | |
14511519 | 123 | atomic_set(&hard_iface->bat_iv.ogm_seqno, random_seqno); |
d0b9fd89 | 124 | |
14511519 ML |
125 | hard_iface->bat_iv.ogm_buff_len = BATADV_OGM_HLEN; |
126 | ogm_buff = kmalloc(hard_iface->bat_iv.ogm_buff_len, GFP_ATOMIC); | |
127 | if (!ogm_buff) | |
77af7575 ML |
128 | goto out; |
129 | ||
14511519 ML |
130 | hard_iface->bat_iv.ogm_buff = ogm_buff; |
131 | ||
132 | batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff; | |
96412690 SE |
133 | batadv_ogm_packet->header.packet_type = BATADV_IV_OGM; |
134 | batadv_ogm_packet->header.version = BATADV_COMPAT_VERSION; | |
135 | batadv_ogm_packet->header.ttl = 2; | |
136 | batadv_ogm_packet->flags = BATADV_NO_FLAGS; | |
137 | batadv_ogm_packet->tq = BATADV_TQ_MAX_VALUE; | |
138 | batadv_ogm_packet->tt_num_changes = 0; | |
139 | batadv_ogm_packet->ttvn = 0; | |
77af7575 ML |
140 | |
141 | res = 0; | |
142 | ||
143 | out: | |
144 | return res; | |
d0b9fd89 ML |
145 | } |
146 | ||
56303d34 | 147 | static void batadv_iv_ogm_iface_disable(struct batadv_hard_iface *hard_iface) |
00a50076 | 148 | { |
14511519 ML |
149 | kfree(hard_iface->bat_iv.ogm_buff); |
150 | hard_iface->bat_iv.ogm_buff = NULL; | |
00a50076 ML |
151 | } |
152 | ||
56303d34 | 153 | static void batadv_iv_ogm_iface_update_mac(struct batadv_hard_iface *hard_iface) |
d0b9fd89 | 154 | { |
96412690 | 155 | struct batadv_ogm_packet *batadv_ogm_packet; |
14511519 | 156 | unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff; |
d0b9fd89 | 157 | |
14511519 | 158 | batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff; |
96412690 | 159 | memcpy(batadv_ogm_packet->orig, |
c3229398 | 160 | hard_iface->net_dev->dev_addr, ETH_ALEN); |
96412690 | 161 | memcpy(batadv_ogm_packet->prev_sender, |
c3229398 | 162 | hard_iface->net_dev->dev_addr, ETH_ALEN); |
d0b9fd89 ML |
163 | } |
164 | ||
56303d34 SE |
165 | static void |
166 | batadv_iv_ogm_primary_iface_set(struct batadv_hard_iface *hard_iface) | |
d0b9fd89 | 167 | { |
96412690 | 168 | struct batadv_ogm_packet *batadv_ogm_packet; |
14511519 | 169 | unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff; |
d0b9fd89 | 170 | |
14511519 | 171 | batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff; |
96412690 SE |
172 | batadv_ogm_packet->flags = BATADV_PRIMARIES_FIRST_HOP; |
173 | batadv_ogm_packet->header.ttl = BATADV_TTL; | |
d0b9fd89 ML |
174 | } |
175 | ||
b9dacc52 | 176 | /* when do we schedule our own ogm to be sent */ |
fe8bc396 | 177 | static unsigned long |
56303d34 | 178 | batadv_iv_ogm_emit_send_time(const struct batadv_priv *bat_priv) |
b9dacc52 | 179 | { |
42d0b044 SE |
180 | unsigned int msecs; |
181 | ||
182 | msecs = atomic_read(&bat_priv->orig_interval) - BATADV_JITTER; | |
e76e4320 | 183 | msecs += prandom_u32() % (2 * BATADV_JITTER); |
42d0b044 SE |
184 | |
185 | return jiffies + msecs_to_jiffies(msecs); | |
b9dacc52 ML |
186 | } |
187 | ||
188 | /* when do we schedule a ogm packet to be sent */ | |
fe8bc396 | 189 | static unsigned long batadv_iv_ogm_fwd_send_time(void) |
b9dacc52 | 190 | { |
e76e4320 | 191 | return jiffies + msecs_to_jiffies(prandom_u32() % (BATADV_JITTER / 2)); |
b9dacc52 ML |
192 | } |
193 | ||
194 | /* apply hop penalty for a normal link */ | |
56303d34 SE |
195 | static uint8_t batadv_hop_penalty(uint8_t tq, |
196 | const struct batadv_priv *bat_priv) | |
b9dacc52 ML |
197 | { |
198 | int hop_penalty = atomic_read(&bat_priv->hop_penalty); | |
42d0b044 SE |
199 | int new_tq; |
200 | ||
201 | new_tq = tq * (BATADV_TQ_MAX_VALUE - hop_penalty); | |
202 | new_tq /= BATADV_TQ_MAX_VALUE; | |
203 | ||
204 | return new_tq; | |
b9dacc52 ML |
205 | } |
206 | ||
fc957275 | 207 | /* is there another aggregated packet here? */ |
fe8bc396 SE |
208 | static int batadv_iv_ogm_aggr_packet(int buff_pos, int packet_len, |
209 | int tt_num_changes) | |
fc957275 | 210 | { |
08c36d3e SE |
211 | int next_buff_pos = 0; |
212 | ||
7e071c79 | 213 | next_buff_pos += buff_pos + BATADV_OGM_HLEN; |
08c36d3e | 214 | next_buff_pos += batadv_tt_len(tt_num_changes); |
fc957275 ML |
215 | |
216 | return (next_buff_pos <= packet_len) && | |
42d0b044 | 217 | (next_buff_pos <= BATADV_MAX_AGGREGATION_BYTES); |
fc957275 ML |
218 | } |
219 | ||
b9dacc52 | 220 | /* send a batman ogm to a given interface */ |
56303d34 SE |
221 | static void batadv_iv_ogm_send_to_if(struct batadv_forw_packet *forw_packet, |
222 | struct batadv_hard_iface *hard_iface) | |
b9dacc52 | 223 | { |
56303d34 | 224 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
b9dacc52 ML |
225 | char *fwd_str; |
226 | uint8_t packet_num; | |
227 | int16_t buff_pos; | |
96412690 | 228 | struct batadv_ogm_packet *batadv_ogm_packet; |
b9dacc52 | 229 | struct sk_buff *skb; |
c67893d1 | 230 | uint8_t *packet_pos; |
b9dacc52 | 231 | |
e9a4f295 | 232 | if (hard_iface->if_status != BATADV_IF_ACTIVE) |
b9dacc52 ML |
233 | return; |
234 | ||
235 | packet_num = 0; | |
236 | buff_pos = 0; | |
c67893d1 SE |
237 | packet_pos = forw_packet->skb->data; |
238 | batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos; | |
b9dacc52 ML |
239 | |
240 | /* adjust all flags and log packets */ | |
fe8bc396 | 241 | while (batadv_iv_ogm_aggr_packet(buff_pos, forw_packet->packet_len, |
96412690 | 242 | batadv_ogm_packet->tt_num_changes)) { |
b9dacc52 | 243 | /* we might have aggregated direct link packets with an |
9cfc7bd6 SE |
244 | * ordinary base packet |
245 | */ | |
8de47de5 SE |
246 | if (forw_packet->direct_link_flags & BIT(packet_num) && |
247 | forw_packet->if_incoming == hard_iface) | |
96412690 | 248 | batadv_ogm_packet->flags |= BATADV_DIRECTLINK; |
b9dacc52 | 249 | else |
96412690 | 250 | batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK; |
b9dacc52 | 251 | |
c67893d1 SE |
252 | if (packet_num > 0 || !forw_packet->own) |
253 | fwd_str = "Forwarding"; | |
254 | else | |
255 | fwd_str = "Sending own"; | |
256 | ||
39c75a51 | 257 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
258 | "%s %spacket (originator %pM, seqno %u, TQ %d, TTL %d, IDF %s, ttvn %d) on interface %s [%pM]\n", |
259 | fwd_str, (packet_num > 0 ? "aggregated " : ""), | |
96412690 SE |
260 | batadv_ogm_packet->orig, |
261 | ntohl(batadv_ogm_packet->seqno), | |
262 | batadv_ogm_packet->tq, batadv_ogm_packet->header.ttl, | |
263 | (batadv_ogm_packet->flags & BATADV_DIRECTLINK ? | |
1eda58bf | 264 | "on" : "off"), |
96412690 | 265 | batadv_ogm_packet->ttvn, hard_iface->net_dev->name, |
1eda58bf | 266 | hard_iface->net_dev->dev_addr); |
b9dacc52 | 267 | |
7e071c79 | 268 | buff_pos += BATADV_OGM_HLEN; |
96412690 | 269 | buff_pos += batadv_tt_len(batadv_ogm_packet->tt_num_changes); |
b9dacc52 | 270 | packet_num++; |
c67893d1 SE |
271 | packet_pos = forw_packet->skb->data + buff_pos; |
272 | batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos; | |
b9dacc52 ML |
273 | } |
274 | ||
275 | /* create clone because function is called more than once */ | |
276 | skb = skb_clone(forw_packet->skb, GFP_ATOMIC); | |
f8214865 | 277 | if (skb) { |
d69909d2 SE |
278 | batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_TX); |
279 | batadv_add_counter(bat_priv, BATADV_CNT_MGMT_TX_BYTES, | |
f8214865 | 280 | skb->len + ETH_HLEN); |
3193e8fd | 281 | batadv_send_skb_packet(skb, hard_iface, batadv_broadcast_addr); |
f8214865 | 282 | } |
b9dacc52 ML |
283 | } |
284 | ||
285 | /* send a batman ogm packet */ | |
56303d34 | 286 | static void batadv_iv_ogm_emit(struct batadv_forw_packet *forw_packet) |
b9dacc52 | 287 | { |
56303d34 | 288 | struct batadv_hard_iface *hard_iface; |
b9dacc52 | 289 | struct net_device *soft_iface; |
56303d34 SE |
290 | struct batadv_priv *bat_priv; |
291 | struct batadv_hard_iface *primary_if = NULL; | |
96412690 | 292 | struct batadv_ogm_packet *batadv_ogm_packet; |
b9dacc52 | 293 | unsigned char directlink; |
c67893d1 | 294 | uint8_t *packet_pos; |
b9dacc52 | 295 | |
c67893d1 SE |
296 | packet_pos = forw_packet->skb->data; |
297 | batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos; | |
96412690 | 298 | directlink = (batadv_ogm_packet->flags & BATADV_DIRECTLINK ? 1 : 0); |
b9dacc52 ML |
299 | |
300 | if (!forw_packet->if_incoming) { | |
86ceb360 | 301 | pr_err("Error - can't forward packet: incoming iface not specified\n"); |
b9dacc52 ML |
302 | goto out; |
303 | } | |
304 | ||
305 | soft_iface = forw_packet->if_incoming->soft_iface; | |
306 | bat_priv = netdev_priv(soft_iface); | |
307 | ||
e9a4f295 | 308 | if (forw_packet->if_incoming->if_status != BATADV_IF_ACTIVE) |
b9dacc52 ML |
309 | goto out; |
310 | ||
e5d89254 | 311 | primary_if = batadv_primary_if_get_selected(bat_priv); |
b9dacc52 ML |
312 | if (!primary_if) |
313 | goto out; | |
314 | ||
9cfc7bd6 SE |
315 | /* multihomed peer assumed |
316 | * non-primary OGMs are only broadcasted on their interface | |
317 | */ | |
96412690 | 318 | if ((directlink && (batadv_ogm_packet->header.ttl == 1)) || |
b9dacc52 | 319 | (forw_packet->own && (forw_packet->if_incoming != primary_if))) { |
b9dacc52 | 320 | /* FIXME: what about aggregated packets ? */ |
39c75a51 | 321 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
322 | "%s packet (originator %pM, seqno %u, TTL %d) on interface %s [%pM]\n", |
323 | (forw_packet->own ? "Sending own" : "Forwarding"), | |
96412690 SE |
324 | batadv_ogm_packet->orig, |
325 | ntohl(batadv_ogm_packet->seqno), | |
326 | batadv_ogm_packet->header.ttl, | |
1eda58bf SE |
327 | forw_packet->if_incoming->net_dev->name, |
328 | forw_packet->if_incoming->net_dev->dev_addr); | |
b9dacc52 ML |
329 | |
330 | /* skb is only used once and than forw_packet is free'd */ | |
9455e34c SE |
331 | batadv_send_skb_packet(forw_packet->skb, |
332 | forw_packet->if_incoming, | |
3193e8fd | 333 | batadv_broadcast_addr); |
b9dacc52 ML |
334 | forw_packet->skb = NULL; |
335 | ||
336 | goto out; | |
337 | } | |
338 | ||
339 | /* broadcast on every interface */ | |
340 | rcu_read_lock(); | |
3193e8fd | 341 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
b9dacc52 ML |
342 | if (hard_iface->soft_iface != soft_iface) |
343 | continue; | |
344 | ||
fe8bc396 | 345 | batadv_iv_ogm_send_to_if(forw_packet, hard_iface); |
b9dacc52 ML |
346 | } |
347 | rcu_read_unlock(); | |
348 | ||
349 | out: | |
350 | if (primary_if) | |
e5d89254 | 351 | batadv_hardif_free_ref(primary_if); |
b9dacc52 ML |
352 | } |
353 | ||
354 | /* return true if new_packet can be aggregated with forw_packet */ | |
fe8bc396 | 355 | static bool |
96412690 | 356 | batadv_iv_ogm_can_aggregate(const struct batadv_ogm_packet *new_bat_ogm_packet, |
56303d34 | 357 | struct batadv_priv *bat_priv, |
fe8bc396 SE |
358 | int packet_len, unsigned long send_time, |
359 | bool directlink, | |
56303d34 SE |
360 | const struct batadv_hard_iface *if_incoming, |
361 | const struct batadv_forw_packet *forw_packet) | |
b9dacc52 | 362 | { |
96412690 | 363 | struct batadv_ogm_packet *batadv_ogm_packet; |
b9dacc52 | 364 | int aggregated_bytes = forw_packet->packet_len + packet_len; |
56303d34 | 365 | struct batadv_hard_iface *primary_if = NULL; |
b9dacc52 | 366 | bool res = false; |
42d0b044 | 367 | unsigned long aggregation_end_time; |
b9dacc52 | 368 | |
96412690 | 369 | batadv_ogm_packet = (struct batadv_ogm_packet *)forw_packet->skb->data; |
42d0b044 SE |
370 | aggregation_end_time = send_time; |
371 | aggregation_end_time += msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS); | |
b9dacc52 | 372 | |
9cfc7bd6 | 373 | /* we can aggregate the current packet to this aggregated packet |
b9dacc52 ML |
374 | * if: |
375 | * | |
376 | * - the send time is within our MAX_AGGREGATION_MS time | |
377 | * - the resulting packet wont be bigger than | |
378 | * MAX_AGGREGATION_BYTES | |
379 | */ | |
b9dacc52 | 380 | if (time_before(send_time, forw_packet->send_time) && |
42d0b044 SE |
381 | time_after_eq(aggregation_end_time, forw_packet->send_time) && |
382 | (aggregated_bytes <= BATADV_MAX_AGGREGATION_BYTES)) { | |
9cfc7bd6 | 383 | /* check aggregation compatibility |
b9dacc52 ML |
384 | * -> direct link packets are broadcasted on |
385 | * their interface only | |
386 | * -> aggregate packet if the current packet is | |
387 | * a "global" packet as well as the base | |
388 | * packet | |
389 | */ | |
e5d89254 | 390 | primary_if = batadv_primary_if_get_selected(bat_priv); |
b9dacc52 ML |
391 | if (!primary_if) |
392 | goto out; | |
393 | ||
394 | /* packets without direct link flag and high TTL | |
9cfc7bd6 SE |
395 | * are flooded through the net |
396 | */ | |
b9dacc52 | 397 | if ((!directlink) && |
96412690 SE |
398 | (!(batadv_ogm_packet->flags & BATADV_DIRECTLINK)) && |
399 | (batadv_ogm_packet->header.ttl != 1) && | |
b9dacc52 ML |
400 | |
401 | /* own packets originating non-primary | |
9cfc7bd6 SE |
402 | * interfaces leave only that interface |
403 | */ | |
b9dacc52 ML |
404 | ((!forw_packet->own) || |
405 | (forw_packet->if_incoming == primary_if))) { | |
406 | res = true; | |
407 | goto out; | |
408 | } | |
409 | ||
410 | /* if the incoming packet is sent via this one | |
9cfc7bd6 SE |
411 | * interface only - we still can aggregate |
412 | */ | |
b9dacc52 | 413 | if ((directlink) && |
fe8bc396 | 414 | (new_bat_ogm_packet->header.ttl == 1) && |
b9dacc52 ML |
415 | (forw_packet->if_incoming == if_incoming) && |
416 | ||
417 | /* packets from direct neighbors or | |
418 | * own secondary interface packets | |
9cfc7bd6 SE |
419 | * (= secondary interface packets in general) |
420 | */ | |
96412690 | 421 | (batadv_ogm_packet->flags & BATADV_DIRECTLINK || |
b9dacc52 ML |
422 | (forw_packet->own && |
423 | forw_packet->if_incoming != primary_if))) { | |
424 | res = true; | |
425 | goto out; | |
426 | } | |
427 | } | |
428 | ||
429 | out: | |
430 | if (primary_if) | |
e5d89254 | 431 | batadv_hardif_free_ref(primary_if); |
b9dacc52 ML |
432 | return res; |
433 | } | |
434 | ||
435 | /* create a new aggregated packet and add this packet to it */ | |
fe8bc396 SE |
436 | static void batadv_iv_ogm_aggregate_new(const unsigned char *packet_buff, |
437 | int packet_len, unsigned long send_time, | |
438 | bool direct_link, | |
56303d34 | 439 | struct batadv_hard_iface *if_incoming, |
fe8bc396 | 440 | int own_packet) |
b9dacc52 | 441 | { |
56303d34 SE |
442 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
443 | struct batadv_forw_packet *forw_packet_aggr; | |
b9dacc52 | 444 | unsigned char *skb_buff; |
42d0b044 | 445 | unsigned int skb_size; |
b9dacc52 ML |
446 | |
447 | if (!atomic_inc_not_zero(&if_incoming->refcount)) | |
448 | return; | |
449 | ||
450 | /* own packet should always be scheduled */ | |
451 | if (!own_packet) { | |
3e34819e | 452 | if (!batadv_atomic_dec_not_zero(&bat_priv->batman_queue_left)) { |
39c75a51 | 453 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 454 | "batman packet queue full\n"); |
b9dacc52 ML |
455 | goto out; |
456 | } | |
457 | } | |
458 | ||
459 | forw_packet_aggr = kmalloc(sizeof(*forw_packet_aggr), GFP_ATOMIC); | |
460 | if (!forw_packet_aggr) { | |
461 | if (!own_packet) | |
462 | atomic_inc(&bat_priv->batman_queue_left); | |
463 | goto out; | |
464 | } | |
465 | ||
466 | if ((atomic_read(&bat_priv->aggregated_ogms)) && | |
42d0b044 | 467 | (packet_len < BATADV_MAX_AGGREGATION_BYTES)) |
5b246574 | 468 | skb_size = BATADV_MAX_AGGREGATION_BYTES; |
b9dacc52 | 469 | else |
5b246574 SE |
470 | skb_size = packet_len; |
471 | ||
41ab6c48 | 472 | skb_size += ETH_HLEN; |
b9dacc52 | 473 | |
41ab6c48 | 474 | forw_packet_aggr->skb = netdev_alloc_skb_ip_align(NULL, skb_size); |
b9dacc52 ML |
475 | if (!forw_packet_aggr->skb) { |
476 | if (!own_packet) | |
477 | atomic_inc(&bat_priv->batman_queue_left); | |
478 | kfree(forw_packet_aggr); | |
479 | goto out; | |
480 | } | |
41ab6c48 | 481 | skb_reserve(forw_packet_aggr->skb, ETH_HLEN); |
b9dacc52 | 482 | |
b9dacc52 ML |
483 | skb_buff = skb_put(forw_packet_aggr->skb, packet_len); |
484 | forw_packet_aggr->packet_len = packet_len; | |
485 | memcpy(skb_buff, packet_buff, packet_len); | |
486 | ||
487 | forw_packet_aggr->own = own_packet; | |
488 | forw_packet_aggr->if_incoming = if_incoming; | |
489 | forw_packet_aggr->num_packets = 0; | |
42d0b044 | 490 | forw_packet_aggr->direct_link_flags = BATADV_NO_FLAGS; |
b9dacc52 ML |
491 | forw_packet_aggr->send_time = send_time; |
492 | ||
493 | /* save packet direct link flag status */ | |
494 | if (direct_link) | |
495 | forw_packet_aggr->direct_link_flags |= 1; | |
496 | ||
497 | /* add new packet to packet list */ | |
498 | spin_lock_bh(&bat_priv->forw_bat_list_lock); | |
499 | hlist_add_head(&forw_packet_aggr->list, &bat_priv->forw_bat_list); | |
500 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); | |
501 | ||
502 | /* start timer for this packet */ | |
503 | INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work, | |
9455e34c | 504 | batadv_send_outstanding_bat_ogm_packet); |
3193e8fd | 505 | queue_delayed_work(batadv_event_workqueue, |
b9dacc52 ML |
506 | &forw_packet_aggr->delayed_work, |
507 | send_time - jiffies); | |
508 | ||
509 | return; | |
510 | out: | |
e5d89254 | 511 | batadv_hardif_free_ref(if_incoming); |
b9dacc52 ML |
512 | } |
513 | ||
514 | /* aggregate a new packet into the existing ogm packet */ | |
56303d34 | 515 | static void batadv_iv_ogm_aggregate(struct batadv_forw_packet *forw_packet_aggr, |
fe8bc396 SE |
516 | const unsigned char *packet_buff, |
517 | int packet_len, bool direct_link) | |
b9dacc52 ML |
518 | { |
519 | unsigned char *skb_buff; | |
8de47de5 | 520 | unsigned long new_direct_link_flag; |
b9dacc52 ML |
521 | |
522 | skb_buff = skb_put(forw_packet_aggr->skb, packet_len); | |
523 | memcpy(skb_buff, packet_buff, packet_len); | |
524 | forw_packet_aggr->packet_len += packet_len; | |
525 | forw_packet_aggr->num_packets++; | |
526 | ||
527 | /* save packet direct link flag status */ | |
8de47de5 SE |
528 | if (direct_link) { |
529 | new_direct_link_flag = BIT(forw_packet_aggr->num_packets); | |
530 | forw_packet_aggr->direct_link_flags |= new_direct_link_flag; | |
531 | } | |
b9dacc52 ML |
532 | } |
533 | ||
56303d34 | 534 | static void batadv_iv_ogm_queue_add(struct batadv_priv *bat_priv, |
fe8bc396 SE |
535 | unsigned char *packet_buff, |
536 | int packet_len, | |
56303d34 | 537 | struct batadv_hard_iface *if_incoming, |
fe8bc396 | 538 | int own_packet, unsigned long send_time) |
b9dacc52 | 539 | { |
9cfc7bd6 | 540 | /* _aggr -> pointer to the packet we want to aggregate with |
b9dacc52 ML |
541 | * _pos -> pointer to the position in the queue |
542 | */ | |
56303d34 SE |
543 | struct batadv_forw_packet *forw_packet_aggr = NULL; |
544 | struct batadv_forw_packet *forw_packet_pos = NULL; | |
96412690 | 545 | struct batadv_ogm_packet *batadv_ogm_packet; |
b9dacc52 | 546 | bool direct_link; |
42d0b044 | 547 | unsigned long max_aggregation_jiffies; |
b9dacc52 | 548 | |
96412690 SE |
549 | batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff; |
550 | direct_link = batadv_ogm_packet->flags & BATADV_DIRECTLINK ? 1 : 0; | |
42d0b044 | 551 | max_aggregation_jiffies = msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS); |
b9dacc52 ML |
552 | |
553 | /* find position for the packet in the forward queue */ | |
554 | spin_lock_bh(&bat_priv->forw_bat_list_lock); | |
555 | /* own packets are not to be aggregated */ | |
556 | if ((atomic_read(&bat_priv->aggregated_ogms)) && (!own_packet)) { | |
b67bfe0d | 557 | hlist_for_each_entry(forw_packet_pos, |
b9dacc52 | 558 | &bat_priv->forw_bat_list, list) { |
96412690 | 559 | if (batadv_iv_ogm_can_aggregate(batadv_ogm_packet, |
fe8bc396 SE |
560 | bat_priv, packet_len, |
561 | send_time, direct_link, | |
562 | if_incoming, | |
563 | forw_packet_pos)) { | |
b9dacc52 ML |
564 | forw_packet_aggr = forw_packet_pos; |
565 | break; | |
566 | } | |
567 | } | |
568 | } | |
569 | ||
570 | /* nothing to aggregate with - either aggregation disabled or no | |
9cfc7bd6 SE |
571 | * suitable aggregation packet found |
572 | */ | |
b9dacc52 ML |
573 | if (!forw_packet_aggr) { |
574 | /* the following section can run without the lock */ | |
575 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); | |
576 | ||
9cfc7bd6 | 577 | /* if we could not aggregate this packet with one of the others |
b9dacc52 ML |
578 | * we hold it back for a while, so that it might be aggregated |
579 | * later on | |
580 | */ | |
42d0b044 SE |
581 | if (!own_packet && atomic_read(&bat_priv->aggregated_ogms)) |
582 | send_time += max_aggregation_jiffies; | |
b9dacc52 | 583 | |
fe8bc396 SE |
584 | batadv_iv_ogm_aggregate_new(packet_buff, packet_len, |
585 | send_time, direct_link, | |
586 | if_incoming, own_packet); | |
b9dacc52 | 587 | } else { |
fe8bc396 SE |
588 | batadv_iv_ogm_aggregate(forw_packet_aggr, packet_buff, |
589 | packet_len, direct_link); | |
b9dacc52 ML |
590 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); |
591 | } | |
592 | } | |
593 | ||
56303d34 | 594 | static void batadv_iv_ogm_forward(struct batadv_orig_node *orig_node, |
fe8bc396 | 595 | const struct ethhdr *ethhdr, |
96412690 | 596 | struct batadv_ogm_packet *batadv_ogm_packet, |
fe8bc396 SE |
597 | bool is_single_hop_neigh, |
598 | bool is_from_best_next_hop, | |
56303d34 | 599 | struct batadv_hard_iface *if_incoming) |
b9dacc52 | 600 | { |
56303d34 | 601 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
b9dacc52 ML |
602 | uint8_t tt_num_changes; |
603 | ||
96412690 | 604 | if (batadv_ogm_packet->header.ttl <= 1) { |
39c75a51 | 605 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "ttl exceeded\n"); |
b9dacc52 ML |
606 | return; |
607 | } | |
608 | ||
13b2541b ML |
609 | if (!is_from_best_next_hop) { |
610 | /* Mark the forwarded packet when it is not coming from our | |
611 | * best next hop. We still need to forward the packet for our | |
612 | * neighbor link quality detection to work in case the packet | |
613 | * originated from a single hop neighbor. Otherwise we can | |
614 | * simply drop the ogm. | |
615 | */ | |
616 | if (is_single_hop_neigh) | |
96412690 | 617 | batadv_ogm_packet->flags |= BATADV_NOT_BEST_NEXT_HOP; |
13b2541b ML |
618 | else |
619 | return; | |
620 | } | |
b9dacc52 | 621 | |
96412690 | 622 | tt_num_changes = batadv_ogm_packet->tt_num_changes; |
b9dacc52 | 623 | |
96412690 SE |
624 | batadv_ogm_packet->header.ttl--; |
625 | memcpy(batadv_ogm_packet->prev_sender, ethhdr->h_source, ETH_ALEN); | |
b9dacc52 | 626 | |
b9dacc52 | 627 | /* apply hop penalty */ |
96412690 | 628 | batadv_ogm_packet->tq = batadv_hop_penalty(batadv_ogm_packet->tq, |
fe8bc396 | 629 | bat_priv); |
b9dacc52 | 630 | |
39c75a51 | 631 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 632 | "Forwarding packet: tq: %i, ttl: %i\n", |
96412690 | 633 | batadv_ogm_packet->tq, batadv_ogm_packet->header.ttl); |
b9dacc52 | 634 | |
b9dacc52 | 635 | /* switch of primaries first hop flag when forwarding */ |
96412690 | 636 | batadv_ogm_packet->flags &= ~BATADV_PRIMARIES_FIRST_HOP; |
75cd33f8 | 637 | if (is_single_hop_neigh) |
96412690 | 638 | batadv_ogm_packet->flags |= BATADV_DIRECTLINK; |
b9dacc52 | 639 | else |
96412690 | 640 | batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK; |
b9dacc52 | 641 | |
96412690 | 642 | batadv_iv_ogm_queue_add(bat_priv, (unsigned char *)batadv_ogm_packet, |
7e071c79 | 643 | BATADV_OGM_HLEN + batadv_tt_len(tt_num_changes), |
fe8bc396 | 644 | if_incoming, 0, batadv_iv_ogm_fwd_send_time()); |
b9dacc52 ML |
645 | } |
646 | ||
d9896617 AQ |
647 | /** |
648 | * batadv_iv_ogm_slide_own_bcast_window - bitshift own OGM broadcast windows for | |
649 | * the given interface | |
650 | * @hard_iface: the interface for which the windows have to be shifted | |
651 | */ | |
652 | static void | |
653 | batadv_iv_ogm_slide_own_bcast_window(struct batadv_hard_iface *hard_iface) | |
654 | { | |
655 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); | |
656 | struct batadv_hashtable *hash = bat_priv->orig_hash; | |
657 | struct hlist_head *head; | |
658 | struct batadv_orig_node *orig_node; | |
659 | unsigned long *word; | |
660 | uint32_t i; | |
661 | size_t word_index; | |
662 | uint8_t *w; | |
663 | ||
664 | for (i = 0; i < hash->size; i++) { | |
665 | head = &hash->table[i]; | |
666 | ||
667 | rcu_read_lock(); | |
668 | hlist_for_each_entry_rcu(orig_node, head, hash_entry) { | |
669 | spin_lock_bh(&orig_node->ogm_cnt_lock); | |
670 | word_index = hard_iface->if_num * BATADV_NUM_WORDS; | |
671 | word = &(orig_node->bcast_own[word_index]); | |
672 | ||
673 | batadv_bit_get_packet(bat_priv, word, 1, 0); | |
674 | w = &orig_node->bcast_own_sum[hard_iface->if_num]; | |
675 | *w = bitmap_weight(word, BATADV_TQ_LOCAL_WINDOW_SIZE); | |
676 | spin_unlock_bh(&orig_node->ogm_cnt_lock); | |
677 | } | |
678 | rcu_read_unlock(); | |
679 | } | |
680 | } | |
681 | ||
56303d34 | 682 | static void batadv_iv_ogm_schedule(struct batadv_hard_iface *hard_iface) |
b9dacc52 | 683 | { |
56303d34 | 684 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
14511519 | 685 | unsigned char **ogm_buff = &hard_iface->bat_iv.ogm_buff; |
96412690 | 686 | struct batadv_ogm_packet *batadv_ogm_packet; |
56303d34 | 687 | struct batadv_hard_iface *primary_if; |
14511519 | 688 | int *ogm_buff_len = &hard_iface->bat_iv.ogm_buff_len; |
be9aa4c1 | 689 | int vis_server, tt_num_changes = 0; |
bbb1f90e SE |
690 | uint32_t seqno; |
691 | uint8_t bandwidth; | |
b9dacc52 ML |
692 | |
693 | vis_server = atomic_read(&bat_priv->vis_mode); | |
e5d89254 | 694 | primary_if = batadv_primary_if_get_selected(bat_priv); |
b9dacc52 | 695 | |
be9aa4c1 | 696 | if (hard_iface == primary_if) |
14511519 ML |
697 | tt_num_changes = batadv_tt_append_diff(bat_priv, ogm_buff, |
698 | ogm_buff_len, | |
7e071c79 | 699 | BATADV_OGM_HLEN); |
be9aa4c1 | 700 | |
14511519 | 701 | batadv_ogm_packet = (struct batadv_ogm_packet *)(*ogm_buff); |
b9dacc52 ML |
702 | |
703 | /* change sequence number to network order */ | |
14511519 | 704 | seqno = (uint32_t)atomic_read(&hard_iface->bat_iv.ogm_seqno); |
bbb1f90e | 705 | batadv_ogm_packet->seqno = htonl(seqno); |
14511519 | 706 | atomic_inc(&hard_iface->bat_iv.ogm_seqno); |
b9dacc52 | 707 | |
807736f6 SE |
708 | batadv_ogm_packet->ttvn = atomic_read(&bat_priv->tt.vn); |
709 | batadv_ogm_packet->tt_crc = htons(bat_priv->tt.local_crc); | |
b9dacc52 | 710 | if (tt_num_changes >= 0) |
96412690 | 711 | batadv_ogm_packet->tt_num_changes = tt_num_changes; |
b9dacc52 | 712 | |
acd34afa | 713 | if (vis_server == BATADV_VIS_TYPE_SERVER_SYNC) |
96412690 | 714 | batadv_ogm_packet->flags |= BATADV_VIS_SERVER; |
b9dacc52 | 715 | else |
96412690 | 716 | batadv_ogm_packet->flags &= ~BATADV_VIS_SERVER; |
b9dacc52 | 717 | |
bbb1f90e SE |
718 | if (hard_iface == primary_if && |
719 | atomic_read(&bat_priv->gw_mode) == BATADV_GW_MODE_SERVER) { | |
720 | bandwidth = (uint8_t)atomic_read(&bat_priv->gw_bandwidth); | |
721 | batadv_ogm_packet->gw_flags = bandwidth; | |
722 | } else { | |
96412690 | 723 | batadv_ogm_packet->gw_flags = BATADV_NO_FLAGS; |
bbb1f90e | 724 | } |
b9dacc52 | 725 | |
d9896617 | 726 | batadv_iv_ogm_slide_own_bcast_window(hard_iface); |
14511519 ML |
727 | batadv_iv_ogm_queue_add(bat_priv, hard_iface->bat_iv.ogm_buff, |
728 | hard_iface->bat_iv.ogm_buff_len, hard_iface, 1, | |
fe8bc396 | 729 | batadv_iv_ogm_emit_send_time(bat_priv)); |
b9dacc52 ML |
730 | |
731 | if (primary_if) | |
e5d89254 | 732 | batadv_hardif_free_ref(primary_if); |
b9dacc52 ML |
733 | } |
734 | ||
fe8bc396 | 735 | static void |
56303d34 SE |
736 | batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv, |
737 | struct batadv_orig_node *orig_node, | |
fe8bc396 | 738 | const struct ethhdr *ethhdr, |
96412690 | 739 | const struct batadv_ogm_packet *batadv_ogm_packet, |
56303d34 | 740 | struct batadv_hard_iface *if_incoming, |
fe8bc396 | 741 | const unsigned char *tt_buff, |
7c24bbbe | 742 | enum batadv_dup_status dup_status) |
fc957275 | 743 | { |
56303d34 SE |
744 | struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL; |
745 | struct batadv_neigh_node *router = NULL; | |
746 | struct batadv_orig_node *orig_node_tmp; | |
7caf69fb | 747 | int if_num; |
bbb1f90e | 748 | uint8_t sum_orig, sum_neigh; |
1eda58bf | 749 | uint8_t *neigh_addr; |
bbb1f90e | 750 | uint8_t tq_avg; |
fc957275 | 751 | |
39c75a51 | 752 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 753 | "update_originator(): Searching and updating originator entry of received packet\n"); |
fc957275 ML |
754 | |
755 | rcu_read_lock(); | |
b67bfe0d | 756 | hlist_for_each_entry_rcu(tmp_neigh_node, |
fc957275 | 757 | &orig_node->neigh_list, list) { |
1eda58bf SE |
758 | neigh_addr = tmp_neigh_node->addr; |
759 | if (batadv_compare_eth(neigh_addr, ethhdr->h_source) && | |
760 | tmp_neigh_node->if_incoming == if_incoming && | |
761 | atomic_inc_not_zero(&tmp_neigh_node->refcount)) { | |
38dc40ef | 762 | if (WARN(neigh_node, "too many matching neigh_nodes")) |
7d211efc | 763 | batadv_neigh_node_free_ref(neigh_node); |
fc957275 ML |
764 | neigh_node = tmp_neigh_node; |
765 | continue; | |
766 | } | |
767 | ||
7c24bbbe | 768 | if (dup_status != BATADV_NO_DUP) |
fc957275 ML |
769 | continue; |
770 | ||
e3b0d0de | 771 | spin_lock_bh(&tmp_neigh_node->lq_update_lock); |
925a6672 SE |
772 | batadv_ring_buffer_set(tmp_neigh_node->tq_recv, |
773 | &tmp_neigh_node->tq_index, 0); | |
bbb1f90e SE |
774 | tq_avg = batadv_ring_buffer_avg(tmp_neigh_node->tq_recv); |
775 | tmp_neigh_node->tq_avg = tq_avg; | |
e3b0d0de | 776 | spin_unlock_bh(&tmp_neigh_node->lq_update_lock); |
fc957275 ML |
777 | } |
778 | ||
779 | if (!neigh_node) { | |
56303d34 | 780 | struct batadv_orig_node *orig_tmp; |
fc957275 | 781 | |
7d211efc | 782 | orig_tmp = batadv_get_orig_node(bat_priv, ethhdr->h_source); |
fc957275 ML |
783 | if (!orig_tmp) |
784 | goto unlock; | |
785 | ||
fe8bc396 SE |
786 | neigh_node = batadv_iv_ogm_neigh_new(if_incoming, |
787 | ethhdr->h_source, | |
863dd7a8 | 788 | orig_node, orig_tmp); |
fc957275 | 789 | |
7d211efc | 790 | batadv_orig_node_free_ref(orig_tmp); |
fc957275 ML |
791 | if (!neigh_node) |
792 | goto unlock; | |
793 | } else | |
39c75a51 | 794 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 795 | "Updating existing last-hop neighbor of originator\n"); |
fc957275 ML |
796 | |
797 | rcu_read_unlock(); | |
798 | ||
96412690 | 799 | orig_node->flags = batadv_ogm_packet->flags; |
d7b2a97e | 800 | neigh_node->last_seen = jiffies; |
fc957275 | 801 | |
e3b0d0de | 802 | spin_lock_bh(&neigh_node->lq_update_lock); |
925a6672 SE |
803 | batadv_ring_buffer_set(neigh_node->tq_recv, |
804 | &neigh_node->tq_index, | |
96412690 | 805 | batadv_ogm_packet->tq); |
925a6672 | 806 | neigh_node->tq_avg = batadv_ring_buffer_avg(neigh_node->tq_recv); |
e3b0d0de | 807 | spin_unlock_bh(&neigh_node->lq_update_lock); |
fc957275 | 808 | |
7c24bbbe | 809 | if (dup_status == BATADV_NO_DUP) { |
96412690 SE |
810 | orig_node->last_ttl = batadv_ogm_packet->header.ttl; |
811 | neigh_node->last_ttl = batadv_ogm_packet->header.ttl; | |
fc957275 ML |
812 | } |
813 | ||
30d3c511 | 814 | batadv_bonding_candidate_add(orig_node, neigh_node); |
fc957275 ML |
815 | |
816 | /* if this neighbor already is our next hop there is nothing | |
9cfc7bd6 SE |
817 | * to change |
818 | */ | |
7d211efc | 819 | router = batadv_orig_node_get_router(orig_node); |
fc957275 ML |
820 | if (router == neigh_node) |
821 | goto update_tt; | |
822 | ||
823 | /* if this neighbor does not offer a better TQ we won't consider it */ | |
824 | if (router && (router->tq_avg > neigh_node->tq_avg)) | |
825 | goto update_tt; | |
826 | ||
827 | /* if the TQ is the same and the link not more symmetric we | |
9cfc7bd6 SE |
828 | * won't consider it either |
829 | */ | |
fc957275 ML |
830 | if (router && (neigh_node->tq_avg == router->tq_avg)) { |
831 | orig_node_tmp = router->orig_node; | |
832 | spin_lock_bh(&orig_node_tmp->ogm_cnt_lock); | |
7caf69fb LL |
833 | if_num = router->if_incoming->if_num; |
834 | sum_orig = orig_node_tmp->bcast_own_sum[if_num]; | |
fc957275 ML |
835 | spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock); |
836 | ||
837 | orig_node_tmp = neigh_node->orig_node; | |
838 | spin_lock_bh(&orig_node_tmp->ogm_cnt_lock); | |
7caf69fb LL |
839 | if_num = neigh_node->if_incoming->if_num; |
840 | sum_neigh = orig_node_tmp->bcast_own_sum[if_num]; | |
fc957275 ML |
841 | spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock); |
842 | ||
bbb1f90e | 843 | if (sum_orig >= sum_neigh) |
fc957275 ML |
844 | goto update_tt; |
845 | } | |
846 | ||
30d3c511 | 847 | batadv_update_route(bat_priv, orig_node, neigh_node); |
fc957275 ML |
848 | |
849 | update_tt: | |
850 | /* I have to check for transtable changes only if the OGM has been | |
9cfc7bd6 SE |
851 | * sent through a primary interface |
852 | */ | |
96412690 SE |
853 | if (((batadv_ogm_packet->orig != ethhdr->h_source) && |
854 | (batadv_ogm_packet->header.ttl > 2)) || | |
855 | (batadv_ogm_packet->flags & BATADV_PRIMARIES_FIRST_HOP)) | |
08c36d3e | 856 | batadv_tt_update_orig(bat_priv, orig_node, tt_buff, |
96412690 SE |
857 | batadv_ogm_packet->tt_num_changes, |
858 | batadv_ogm_packet->ttvn, | |
859 | ntohs(batadv_ogm_packet->tt_crc)); | |
fc957275 | 860 | |
96412690 | 861 | if (orig_node->gw_flags != batadv_ogm_packet->gw_flags) |
7cf06bc6 | 862 | batadv_gw_node_update(bat_priv, orig_node, |
96412690 | 863 | batadv_ogm_packet->gw_flags); |
fc957275 | 864 | |
96412690 | 865 | orig_node->gw_flags = batadv_ogm_packet->gw_flags; |
fc957275 ML |
866 | |
867 | /* restart gateway selection if fast or late switching was enabled */ | |
868 | if ((orig_node->gw_flags) && | |
cd646ab1 | 869 | (atomic_read(&bat_priv->gw_mode) == BATADV_GW_MODE_CLIENT) && |
fc957275 | 870 | (atomic_read(&bat_priv->gw_sel_class) > 2)) |
7cf06bc6 | 871 | batadv_gw_check_election(bat_priv, orig_node); |
fc957275 ML |
872 | |
873 | goto out; | |
874 | ||
875 | unlock: | |
876 | rcu_read_unlock(); | |
877 | out: | |
878 | if (neigh_node) | |
7d211efc | 879 | batadv_neigh_node_free_ref(neigh_node); |
fc957275 | 880 | if (router) |
7d211efc | 881 | batadv_neigh_node_free_ref(router); |
fc957275 ML |
882 | } |
883 | ||
56303d34 SE |
884 | static int batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node, |
885 | struct batadv_orig_node *orig_neigh_node, | |
96412690 | 886 | struct batadv_ogm_packet *batadv_ogm_packet, |
56303d34 | 887 | struct batadv_hard_iface *if_incoming) |
fc957275 | 888 | { |
56303d34 SE |
889 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
890 | struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node; | |
fc957275 | 891 | uint8_t total_count; |
42d0b044 SE |
892 | uint8_t orig_eq_count, neigh_rq_count, neigh_rq_inv, tq_own; |
893 | unsigned int neigh_rq_inv_cube, neigh_rq_max_cube; | |
894 | int tq_asym_penalty, inv_asym_penalty, ret = 0; | |
895 | unsigned int combined_tq; | |
fc957275 ML |
896 | |
897 | /* find corresponding one hop neighbor */ | |
898 | rcu_read_lock(); | |
b67bfe0d | 899 | hlist_for_each_entry_rcu(tmp_neigh_node, |
fc957275 | 900 | &orig_neigh_node->neigh_list, list) { |
1eda58bf SE |
901 | if (!batadv_compare_eth(tmp_neigh_node->addr, |
902 | orig_neigh_node->orig)) | |
fc957275 ML |
903 | continue; |
904 | ||
905 | if (tmp_neigh_node->if_incoming != if_incoming) | |
906 | continue; | |
907 | ||
908 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) | |
909 | continue; | |
910 | ||
911 | neigh_node = tmp_neigh_node; | |
912 | break; | |
913 | } | |
914 | rcu_read_unlock(); | |
915 | ||
916 | if (!neigh_node) | |
fe8bc396 SE |
917 | neigh_node = batadv_iv_ogm_neigh_new(if_incoming, |
918 | orig_neigh_node->orig, | |
919 | orig_neigh_node, | |
863dd7a8 | 920 | orig_neigh_node); |
fc957275 ML |
921 | |
922 | if (!neigh_node) | |
923 | goto out; | |
924 | ||
d7b2a97e | 925 | /* if orig_node is direct neighbor update neigh_node last_seen */ |
fc957275 | 926 | if (orig_node == orig_neigh_node) |
d7b2a97e | 927 | neigh_node->last_seen = jiffies; |
fc957275 | 928 | |
d7b2a97e | 929 | orig_node->last_seen = jiffies; |
fc957275 ML |
930 | |
931 | /* find packet count of corresponding one hop neighbor */ | |
932 | spin_lock_bh(&orig_node->ogm_cnt_lock); | |
933 | orig_eq_count = orig_neigh_node->bcast_own_sum[if_incoming->if_num]; | |
934 | neigh_rq_count = neigh_node->real_packet_count; | |
935 | spin_unlock_bh(&orig_node->ogm_cnt_lock); | |
936 | ||
937 | /* pay attention to not get a value bigger than 100 % */ | |
c67893d1 SE |
938 | if (orig_eq_count > neigh_rq_count) |
939 | total_count = neigh_rq_count; | |
940 | else | |
941 | total_count = orig_eq_count; | |
fc957275 | 942 | |
9cfc7bd6 SE |
943 | /* if we have too few packets (too less data) we set tq_own to zero |
944 | * if we receive too few packets it is not considered bidirectional | |
945 | */ | |
42d0b044 SE |
946 | if (total_count < BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM || |
947 | neigh_rq_count < BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM) | |
fc957275 ML |
948 | tq_own = 0; |
949 | else | |
950 | /* neigh_node->real_packet_count is never zero as we | |
951 | * only purge old information when getting new | |
9cfc7bd6 SE |
952 | * information |
953 | */ | |
42d0b044 | 954 | tq_own = (BATADV_TQ_MAX_VALUE * total_count) / neigh_rq_count; |
fc957275 | 955 | |
21a1236b | 956 | /* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does |
fc957275 ML |
957 | * affect the nearly-symmetric links only a little, but |
958 | * punishes asymmetric links more. This will give a value | |
959 | * between 0 and TQ_MAX_VALUE | |
960 | */ | |
42d0b044 SE |
961 | neigh_rq_inv = BATADV_TQ_LOCAL_WINDOW_SIZE - neigh_rq_count; |
962 | neigh_rq_inv_cube = neigh_rq_inv * neigh_rq_inv * neigh_rq_inv; | |
963 | neigh_rq_max_cube = BATADV_TQ_LOCAL_WINDOW_SIZE * | |
964 | BATADV_TQ_LOCAL_WINDOW_SIZE * | |
965 | BATADV_TQ_LOCAL_WINDOW_SIZE; | |
966 | inv_asym_penalty = BATADV_TQ_MAX_VALUE * neigh_rq_inv_cube; | |
967 | inv_asym_penalty /= neigh_rq_max_cube; | |
968 | tq_asym_penalty = BATADV_TQ_MAX_VALUE - inv_asym_penalty; | |
969 | ||
96412690 | 970 | combined_tq = batadv_ogm_packet->tq * tq_own * tq_asym_penalty; |
42d0b044 | 971 | combined_tq /= BATADV_TQ_MAX_VALUE * BATADV_TQ_MAX_VALUE; |
96412690 | 972 | batadv_ogm_packet->tq = combined_tq; |
fc957275 | 973 | |
39c75a51 | 974 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
975 | "bidirectional: orig = %-15pM neigh = %-15pM => own_bcast = %2i, real recv = %2i, local tq: %3i, asym_penalty: %3i, total tq: %3i\n", |
976 | orig_node->orig, orig_neigh_node->orig, total_count, | |
977 | neigh_rq_count, tq_own, | |
96412690 | 978 | tq_asym_penalty, batadv_ogm_packet->tq); |
fc957275 ML |
979 | |
980 | /* if link has the minimum required transmission quality | |
9cfc7bd6 SE |
981 | * consider it bidirectional |
982 | */ | |
96412690 | 983 | if (batadv_ogm_packet->tq >= BATADV_TQ_TOTAL_BIDRECT_LIMIT) |
fc957275 ML |
984 | ret = 1; |
985 | ||
986 | out: | |
987 | if (neigh_node) | |
7d211efc | 988 | batadv_neigh_node_free_ref(neigh_node); |
fc957275 ML |
989 | return ret; |
990 | } | |
991 | ||
7c24bbbe SW |
992 | /** |
993 | * batadv_iv_ogm_update_seqnos - process a batman packet for all interfaces, | |
994 | * adjust the sequence number and find out whether it is a duplicate | |
995 | * @ethhdr: ethernet header of the packet | |
996 | * @batadv_ogm_packet: OGM packet to be considered | |
997 | * @if_incoming: interface on which the OGM packet was received | |
998 | * | |
999 | * Returns duplicate status as enum batadv_dup_status | |
fc957275 | 1000 | */ |
7c24bbbe | 1001 | static enum batadv_dup_status |
fe8bc396 | 1002 | batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr, |
96412690 | 1003 | const struct batadv_ogm_packet *batadv_ogm_packet, |
56303d34 | 1004 | const struct batadv_hard_iface *if_incoming) |
fc957275 | 1005 | { |
56303d34 SE |
1006 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
1007 | struct batadv_orig_node *orig_node; | |
1008 | struct batadv_neigh_node *tmp_neigh_node; | |
7c24bbbe | 1009 | int is_dup; |
fc957275 ML |
1010 | int32_t seq_diff; |
1011 | int need_update = 0; | |
7c24bbbe SW |
1012 | int set_mark; |
1013 | enum batadv_dup_status ret = BATADV_NO_DUP; | |
96412690 | 1014 | uint32_t seqno = ntohl(batadv_ogm_packet->seqno); |
1eda58bf | 1015 | uint8_t *neigh_addr; |
bbb1f90e | 1016 | uint8_t packet_count; |
fc957275 | 1017 | |
96412690 | 1018 | orig_node = batadv_get_orig_node(bat_priv, batadv_ogm_packet->orig); |
fc957275 | 1019 | if (!orig_node) |
7c24bbbe | 1020 | return BATADV_NO_DUP; |
fc957275 ML |
1021 | |
1022 | spin_lock_bh(&orig_node->ogm_cnt_lock); | |
e0f5211f | 1023 | seq_diff = seqno - orig_node->last_real_seqno; |
fc957275 ML |
1024 | |
1025 | /* signalize caller that the packet is to be dropped. */ | |
1e5cc266 | 1026 | if (!hlist_empty(&orig_node->neigh_list) && |
30d3c511 | 1027 | batadv_window_protected(bat_priv, seq_diff, |
7c24bbbe SW |
1028 | &orig_node->batman_seqno_reset)) { |
1029 | ret = BATADV_PROTECTED; | |
fc957275 | 1030 | goto out; |
7c24bbbe | 1031 | } |
fc957275 ML |
1032 | |
1033 | rcu_read_lock(); | |
b67bfe0d | 1034 | hlist_for_each_entry_rcu(tmp_neigh_node, |
fc957275 | 1035 | &orig_node->neigh_list, list) { |
1eda58bf | 1036 | neigh_addr = tmp_neigh_node->addr; |
7c24bbbe SW |
1037 | is_dup = batadv_test_bit(tmp_neigh_node->real_bits, |
1038 | orig_node->last_real_seqno, | |
1039 | seqno); | |
1040 | ||
1eda58bf | 1041 | if (batadv_compare_eth(neigh_addr, ethhdr->h_source) && |
7c24bbbe | 1042 | tmp_neigh_node->if_incoming == if_incoming) { |
fc957275 | 1043 | set_mark = 1; |
7c24bbbe SW |
1044 | if (is_dup) |
1045 | ret = BATADV_NEIGH_DUP; | |
1046 | } else { | |
fc957275 | 1047 | set_mark = 0; |
7c24bbbe SW |
1048 | if (is_dup && (ret != BATADV_NEIGH_DUP)) |
1049 | ret = BATADV_ORIG_DUP; | |
1050 | } | |
fc957275 ML |
1051 | |
1052 | /* if the window moved, set the update flag. */ | |
0f5f9322 SE |
1053 | need_update |= batadv_bit_get_packet(bat_priv, |
1054 | tmp_neigh_node->real_bits, | |
1055 | seq_diff, set_mark); | |
fc957275 | 1056 | |
bbb1f90e SE |
1057 | packet_count = bitmap_weight(tmp_neigh_node->real_bits, |
1058 | BATADV_TQ_LOCAL_WINDOW_SIZE); | |
1059 | tmp_neigh_node->real_packet_count = packet_count; | |
fc957275 ML |
1060 | } |
1061 | rcu_read_unlock(); | |
1062 | ||
1063 | if (need_update) { | |
39c75a51 | 1064 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
1065 | "updating last_seqno: old %u, new %u\n", |
1066 | orig_node->last_real_seqno, seqno); | |
e0f5211f | 1067 | orig_node->last_real_seqno = seqno; |
fc957275 ML |
1068 | } |
1069 | ||
fc957275 ML |
1070 | out: |
1071 | spin_unlock_bh(&orig_node->ogm_cnt_lock); | |
7d211efc | 1072 | batadv_orig_node_free_ref(orig_node); |
fc957275 ML |
1073 | return ret; |
1074 | } | |
1075 | ||
fe8bc396 | 1076 | static void batadv_iv_ogm_process(const struct ethhdr *ethhdr, |
96412690 | 1077 | struct batadv_ogm_packet *batadv_ogm_packet, |
fe8bc396 | 1078 | const unsigned char *tt_buff, |
56303d34 | 1079 | struct batadv_hard_iface *if_incoming) |
fc957275 | 1080 | { |
56303d34 SE |
1081 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
1082 | struct batadv_hard_iface *hard_iface; | |
1083 | struct batadv_orig_node *orig_neigh_node, *orig_node; | |
1084 | struct batadv_neigh_node *router = NULL, *router_router = NULL; | |
1085 | struct batadv_neigh_node *orig_neigh_router = NULL; | |
fc957275 ML |
1086 | int has_directlink_flag; |
1087 | int is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0; | |
281581d3 | 1088 | int is_bidirect; |
75cd33f8 | 1089 | bool is_single_hop_neigh = false; |
13b2541b | 1090 | bool is_from_best_next_hop = false; |
7c24bbbe SW |
1091 | int sameseq, similar_ttl; |
1092 | enum batadv_dup_status dup_status; | |
fc957275 | 1093 | uint32_t if_incoming_seqno; |
1eda58bf | 1094 | uint8_t *prev_sender; |
fc957275 ML |
1095 | |
1096 | /* Silently drop when the batman packet is actually not a | |
1097 | * correct packet. | |
1098 | * | |
1099 | * This might happen if a packet is padded (e.g. Ethernet has a | |
1100 | * minimum frame length of 64 byte) and the aggregation interprets | |
1101 | * it as an additional length. | |
1102 | * | |
1103 | * TODO: A more sane solution would be to have a bit in the | |
96412690 | 1104 | * batadv_ogm_packet to detect whether the packet is the last |
fc957275 ML |
1105 | * packet in an aggregation. Here we expect that the padding |
1106 | * is always zero (or not 0x01) | |
1107 | */ | |
96412690 | 1108 | if (batadv_ogm_packet->header.packet_type != BATADV_IV_OGM) |
fc957275 ML |
1109 | return; |
1110 | ||
1111 | /* could be changed by schedule_own_packet() */ | |
14511519 | 1112 | if_incoming_seqno = atomic_read(&if_incoming->bat_iv.ogm_seqno); |
fc957275 | 1113 | |
96412690 | 1114 | if (batadv_ogm_packet->flags & BATADV_DIRECTLINK) |
acd34afa SE |
1115 | has_directlink_flag = 1; |
1116 | else | |
1117 | has_directlink_flag = 0; | |
fc957275 | 1118 | |
96412690 | 1119 | if (batadv_compare_eth(ethhdr->h_source, batadv_ogm_packet->orig)) |
75cd33f8 | 1120 | is_single_hop_neigh = true; |
fc957275 | 1121 | |
39c75a51 | 1122 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
c0275e24 | 1123 | "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", |
1eda58bf | 1124 | ethhdr->h_source, if_incoming->net_dev->name, |
96412690 SE |
1125 | if_incoming->net_dev->dev_addr, batadv_ogm_packet->orig, |
1126 | batadv_ogm_packet->prev_sender, | |
1127 | ntohl(batadv_ogm_packet->seqno), batadv_ogm_packet->ttvn, | |
1128 | ntohs(batadv_ogm_packet->tt_crc), | |
1129 | batadv_ogm_packet->tt_num_changes, batadv_ogm_packet->tq, | |
1130 | batadv_ogm_packet->header.ttl, | |
1131 | batadv_ogm_packet->header.version, has_directlink_flag); | |
fc957275 ML |
1132 | |
1133 | rcu_read_lock(); | |
3193e8fd | 1134 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e9a4f295 | 1135 | if (hard_iface->if_status != BATADV_IF_ACTIVE) |
fc957275 ML |
1136 | continue; |
1137 | ||
1138 | if (hard_iface->soft_iface != if_incoming->soft_iface) | |
1139 | continue; | |
1140 | ||
1eda58bf SE |
1141 | if (batadv_compare_eth(ethhdr->h_source, |
1142 | hard_iface->net_dev->dev_addr)) | |
fc957275 ML |
1143 | is_my_addr = 1; |
1144 | ||
96412690 | 1145 | if (batadv_compare_eth(batadv_ogm_packet->orig, |
1eda58bf | 1146 | hard_iface->net_dev->dev_addr)) |
fc957275 ML |
1147 | is_my_orig = 1; |
1148 | ||
96412690 | 1149 | if (batadv_compare_eth(batadv_ogm_packet->prev_sender, |
1eda58bf | 1150 | hard_iface->net_dev->dev_addr)) |
fc957275 | 1151 | is_my_oldorig = 1; |
fc957275 ML |
1152 | } |
1153 | rcu_read_unlock(); | |
1154 | ||
fc957275 | 1155 | if (is_my_addr) { |
39c75a51 | 1156 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
1157 | "Drop packet: received my own broadcast (sender: %pM)\n", |
1158 | ethhdr->h_source); | |
fc957275 ML |
1159 | return; |
1160 | } | |
1161 | ||
fc957275 ML |
1162 | if (is_my_orig) { |
1163 | unsigned long *word; | |
1164 | int offset; | |
9b4a1159 | 1165 | int32_t bit_pos; |
42d0b044 SE |
1166 | int16_t if_num; |
1167 | uint8_t *weight; | |
fc957275 | 1168 | |
7d211efc SE |
1169 | orig_neigh_node = batadv_get_orig_node(bat_priv, |
1170 | ethhdr->h_source); | |
fc957275 ML |
1171 | if (!orig_neigh_node) |
1172 | return; | |
1173 | ||
1174 | /* neighbor has to indicate direct link and it has to | |
9cfc7bd6 SE |
1175 | * come via the corresponding interface |
1176 | * save packet seqno for bidirectional check | |
1177 | */ | |
fc957275 | 1178 | if (has_directlink_flag && |
1eda58bf | 1179 | batadv_compare_eth(if_incoming->net_dev->dev_addr, |
96412690 | 1180 | batadv_ogm_packet->orig)) { |
42d0b044 SE |
1181 | if_num = if_incoming->if_num; |
1182 | offset = if_num * BATADV_NUM_WORDS; | |
fc957275 ML |
1183 | |
1184 | spin_lock_bh(&orig_neigh_node->ogm_cnt_lock); | |
1185 | word = &(orig_neigh_node->bcast_own[offset]); | |
9b4a1159 | 1186 | bit_pos = if_incoming_seqno - 2; |
96412690 | 1187 | bit_pos -= ntohl(batadv_ogm_packet->seqno); |
9b4a1159 | 1188 | batadv_set_bit(word, bit_pos); |
42d0b044 SE |
1189 | weight = &orig_neigh_node->bcast_own_sum[if_num]; |
1190 | *weight = bitmap_weight(word, | |
1191 | BATADV_TQ_LOCAL_WINDOW_SIZE); | |
fc957275 ML |
1192 | spin_unlock_bh(&orig_neigh_node->ogm_cnt_lock); |
1193 | } | |
1194 | ||
39c75a51 | 1195 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1196 | "Drop packet: originator packet from myself (via neighbor)\n"); |
7d211efc | 1197 | batadv_orig_node_free_ref(orig_neigh_node); |
fc957275 ML |
1198 | return; |
1199 | } | |
1200 | ||
1201 | if (is_my_oldorig) { | |
39c75a51 | 1202 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
1203 | "Drop packet: ignoring all rebroadcast echos (sender: %pM)\n", |
1204 | ethhdr->h_source); | |
fc957275 ML |
1205 | return; |
1206 | } | |
1207 | ||
96412690 | 1208 | if (batadv_ogm_packet->flags & BATADV_NOT_BEST_NEXT_HOP) { |
39c75a51 | 1209 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
1210 | "Drop packet: ignoring all packets not forwarded from the best next hop (sender: %pM)\n", |
1211 | ethhdr->h_source); | |
13b2541b ML |
1212 | return; |
1213 | } | |
1214 | ||
96412690 | 1215 | orig_node = batadv_get_orig_node(bat_priv, batadv_ogm_packet->orig); |
fc957275 ML |
1216 | if (!orig_node) |
1217 | return; | |
1218 | ||
7c24bbbe SW |
1219 | dup_status = batadv_iv_ogm_update_seqnos(ethhdr, batadv_ogm_packet, |
1220 | if_incoming); | |
fc957275 | 1221 | |
7c24bbbe | 1222 | if (dup_status == BATADV_PROTECTED) { |
39c75a51 | 1223 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
1224 | "Drop packet: packet within seqno protection time (sender: %pM)\n", |
1225 | ethhdr->h_source); | |
fc957275 ML |
1226 | goto out; |
1227 | } | |
1228 | ||
96412690 | 1229 | if (batadv_ogm_packet->tq == 0) { |
39c75a51 | 1230 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1231 | "Drop packet: originator packet with tq equal 0\n"); |
fc957275 ML |
1232 | goto out; |
1233 | } | |
1234 | ||
7d211efc | 1235 | router = batadv_orig_node_get_router(orig_node); |
fc957275 | 1236 | if (router) |
7d211efc | 1237 | router_router = batadv_orig_node_get_router(router->orig_node); |
fc957275 | 1238 | |
13b2541b | 1239 | if ((router && router->tq_avg != 0) && |
1eda58bf | 1240 | (batadv_compare_eth(router->addr, ethhdr->h_source))) |
13b2541b ML |
1241 | is_from_best_next_hop = true; |
1242 | ||
96412690 | 1243 | prev_sender = batadv_ogm_packet->prev_sender; |
fc957275 ML |
1244 | /* avoid temporary routing loops */ |
1245 | if (router && router_router && | |
1eda58bf | 1246 | (batadv_compare_eth(router->addr, prev_sender)) && |
96412690 | 1247 | !(batadv_compare_eth(batadv_ogm_packet->orig, prev_sender)) && |
1eda58bf | 1248 | (batadv_compare_eth(router->addr, router_router->addr))) { |
39c75a51 | 1249 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
1250 | "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n", |
1251 | ethhdr->h_source); | |
fc957275 ML |
1252 | goto out; |
1253 | } | |
1254 | ||
1255 | /* if sender is a direct neighbor the sender mac equals | |
9cfc7bd6 SE |
1256 | * originator mac |
1257 | */ | |
c67893d1 SE |
1258 | if (is_single_hop_neigh) |
1259 | orig_neigh_node = orig_node; | |
1260 | else | |
1261 | orig_neigh_node = batadv_get_orig_node(bat_priv, | |
1262 | ethhdr->h_source); | |
1263 | ||
fc957275 ML |
1264 | if (!orig_neigh_node) |
1265 | goto out; | |
1266 | ||
d56b1705 MH |
1267 | /* Update nc_nodes of the originator */ |
1268 | batadv_nc_update_nc_node(bat_priv, orig_node, orig_neigh_node, | |
1269 | batadv_ogm_packet, is_single_hop_neigh); | |
1270 | ||
7d211efc | 1271 | orig_neigh_router = batadv_orig_node_get_router(orig_neigh_node); |
fc957275 ML |
1272 | |
1273 | /* drop packet if sender is not a direct neighbor and if we | |
9cfc7bd6 SE |
1274 | * don't route towards it |
1275 | */ | |
fc957275 | 1276 | if (!is_single_hop_neigh && (!orig_neigh_router)) { |
39c75a51 | 1277 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1278 | "Drop packet: OGM via unknown neighbor!\n"); |
fc957275 ML |
1279 | goto out_neigh; |
1280 | } | |
1281 | ||
fe8bc396 | 1282 | is_bidirect = batadv_iv_ogm_calc_tq(orig_node, orig_neigh_node, |
96412690 | 1283 | batadv_ogm_packet, if_incoming); |
fc957275 | 1284 | |
30d3c511 | 1285 | batadv_bonding_save_primary(orig_node, orig_neigh_node, |
96412690 | 1286 | batadv_ogm_packet); |
fc957275 ML |
1287 | |
1288 | /* update ranking if it is not a duplicate or has the same | |
9cfc7bd6 SE |
1289 | * seqno and similar ttl as the non-duplicate |
1290 | */ | |
96412690 | 1291 | sameseq = orig_node->last_real_seqno == ntohl(batadv_ogm_packet->seqno); |
7c24bbbe SW |
1292 | similar_ttl = orig_node->last_ttl - 3 <= batadv_ogm_packet->header.ttl; |
1293 | if (is_bidirect && ((dup_status == BATADV_NO_DUP) || | |
1294 | (sameseq && similar_ttl))) | |
fe8bc396 | 1295 | batadv_iv_ogm_orig_update(bat_priv, orig_node, ethhdr, |
96412690 | 1296 | batadv_ogm_packet, if_incoming, |
7c24bbbe | 1297 | tt_buff, dup_status); |
fc957275 ML |
1298 | |
1299 | /* is single hop (direct) neighbor */ | |
1300 | if (is_single_hop_neigh) { | |
fc957275 | 1301 | /* mark direct link on incoming interface */ |
96412690 | 1302 | batadv_iv_ogm_forward(orig_node, ethhdr, batadv_ogm_packet, |
fe8bc396 SE |
1303 | is_single_hop_neigh, |
1304 | is_from_best_next_hop, if_incoming); | |
fc957275 | 1305 | |
39c75a51 | 1306 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1307 | "Forwarding packet: rebroadcast neighbor packet with direct link flag\n"); |
fc957275 ML |
1308 | goto out_neigh; |
1309 | } | |
1310 | ||
1311 | /* multihop originator */ | |
fe8bc396 | 1312 | if (!is_bidirect) { |
39c75a51 | 1313 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1314 | "Drop packet: not received via bidirectional link\n"); |
fc957275 ML |
1315 | goto out_neigh; |
1316 | } | |
1317 | ||
7c24bbbe | 1318 | if (dup_status == BATADV_NEIGH_DUP) { |
39c75a51 | 1319 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1320 | "Drop packet: duplicate packet received\n"); |
fc957275 ML |
1321 | goto out_neigh; |
1322 | } | |
1323 | ||
39c75a51 | 1324 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1325 | "Forwarding packet: rebroadcast originator packet\n"); |
96412690 | 1326 | batadv_iv_ogm_forward(orig_node, ethhdr, batadv_ogm_packet, |
fe8bc396 SE |
1327 | is_single_hop_neigh, is_from_best_next_hop, |
1328 | if_incoming); | |
fc957275 ML |
1329 | |
1330 | out_neigh: | |
1331 | if ((orig_neigh_node) && (!is_single_hop_neigh)) | |
7d211efc | 1332 | batadv_orig_node_free_ref(orig_neigh_node); |
fc957275 ML |
1333 | out: |
1334 | if (router) | |
7d211efc | 1335 | batadv_neigh_node_free_ref(router); |
fc957275 | 1336 | if (router_router) |
7d211efc | 1337 | batadv_neigh_node_free_ref(router_router); |
fc957275 | 1338 | if (orig_neigh_router) |
7d211efc | 1339 | batadv_neigh_node_free_ref(orig_neigh_router); |
fc957275 | 1340 | |
7d211efc | 1341 | batadv_orig_node_free_ref(orig_node); |
fc957275 ML |
1342 | } |
1343 | ||
fe8bc396 | 1344 | static int batadv_iv_ogm_receive(struct sk_buff *skb, |
56303d34 | 1345 | struct batadv_hard_iface *if_incoming) |
fc957275 | 1346 | { |
56303d34 | 1347 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
96412690 | 1348 | struct batadv_ogm_packet *batadv_ogm_packet; |
8780dad9 ML |
1349 | struct ethhdr *ethhdr; |
1350 | int buff_pos = 0, packet_len; | |
1351 | unsigned char *tt_buff, *packet_buff; | |
c3e29312 | 1352 | bool ret; |
c67893d1 | 1353 | uint8_t *packet_pos; |
c3e29312 | 1354 | |
7e071c79 | 1355 | ret = batadv_check_management_packet(skb, if_incoming, BATADV_OGM_HLEN); |
c3e29312 ML |
1356 | if (!ret) |
1357 | return NET_RX_DROP; | |
fc957275 | 1358 | |
edbf12ba ML |
1359 | /* did we receive a B.A.T.M.A.N. IV OGM packet on an interface |
1360 | * that does not have B.A.T.M.A.N. IV enabled ? | |
1361 | */ | |
fe8bc396 | 1362 | if (bat_priv->bat_algo_ops->bat_ogm_emit != batadv_iv_ogm_emit) |
edbf12ba ML |
1363 | return NET_RX_DROP; |
1364 | ||
d69909d2 SE |
1365 | batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX); |
1366 | batadv_add_counter(bat_priv, BATADV_CNT_MGMT_RX_BYTES, | |
f8214865 MH |
1367 | skb->len + ETH_HLEN); |
1368 | ||
8780dad9 | 1369 | packet_len = skb_headlen(skb); |
7ed4be95 | 1370 | ethhdr = eth_hdr(skb); |
8780dad9 | 1371 | packet_buff = skb->data; |
96412690 | 1372 | batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff; |
fc957275 ML |
1373 | |
1374 | /* unpack the aggregated packets and process them one by one */ | |
b47506d9 ML |
1375 | while (batadv_iv_ogm_aggr_packet(buff_pos, packet_len, |
1376 | batadv_ogm_packet->tt_num_changes)) { | |
7e071c79 | 1377 | tt_buff = packet_buff + buff_pos + BATADV_OGM_HLEN; |
fc957275 | 1378 | |
96412690 | 1379 | batadv_iv_ogm_process(ethhdr, batadv_ogm_packet, tt_buff, |
fe8bc396 | 1380 | if_incoming); |
fc957275 | 1381 | |
7e071c79 | 1382 | buff_pos += BATADV_OGM_HLEN; |
96412690 | 1383 | buff_pos += batadv_tt_len(batadv_ogm_packet->tt_num_changes); |
fc957275 | 1384 | |
c67893d1 SE |
1385 | packet_pos = packet_buff + buff_pos; |
1386 | batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos; | |
b47506d9 | 1387 | } |
c3e29312 ML |
1388 | |
1389 | kfree_skb(skb); | |
1390 | return NET_RX_SUCCESS; | |
fc957275 | 1391 | } |
1c280471 | 1392 | |
56303d34 | 1393 | static struct batadv_algo_ops batadv_batman_iv __read_mostly = { |
519d3497 | 1394 | .name = "BATMAN_IV", |
fe8bc396 SE |
1395 | .bat_iface_enable = batadv_iv_ogm_iface_enable, |
1396 | .bat_iface_disable = batadv_iv_ogm_iface_disable, | |
1397 | .bat_iface_update_mac = batadv_iv_ogm_iface_update_mac, | |
1398 | .bat_primary_iface_set = batadv_iv_ogm_primary_iface_set, | |
1399 | .bat_ogm_schedule = batadv_iv_ogm_schedule, | |
1400 | .bat_ogm_emit = batadv_iv_ogm_emit, | |
1c280471 ML |
1401 | }; |
1402 | ||
81c524f7 | 1403 | int __init batadv_iv_init(void) |
1c280471 | 1404 | { |
c3e29312 ML |
1405 | int ret; |
1406 | ||
1407 | /* batman originator packet */ | |
acd34afa SE |
1408 | ret = batadv_recv_handler_register(BATADV_IV_OGM, |
1409 | batadv_iv_ogm_receive); | |
c3e29312 ML |
1410 | if (ret < 0) |
1411 | goto out; | |
1412 | ||
fe8bc396 | 1413 | ret = batadv_algo_register(&batadv_batman_iv); |
c3e29312 ML |
1414 | if (ret < 0) |
1415 | goto handler_unregister; | |
1416 | ||
1417 | goto out; | |
1418 | ||
1419 | handler_unregister: | |
acd34afa | 1420 | batadv_recv_handler_unregister(BATADV_IV_OGM); |
c3e29312 ML |
1421 | out: |
1422 | return ret; | |
1c280471 | 1423 | } |