Commit | Line | Data |
---|---|---|
c6c8fea2 | 1 | /* |
567db7b0 | 2 | * Copyright (C) 2007-2012 B.A.T.M.A.N. contributors: |
c6c8fea2 SE |
3 | * |
4 | * Marek Lindner, Simon Wunderlich | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of version 2 of the GNU General Public | |
8 | * License as published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, but | |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | * General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
18 | * 02110-1301, USA | |
19 | * | |
20 | */ | |
21 | ||
22 | #include "main.h" | |
23 | #include "routing.h" | |
24 | #include "send.h" | |
c6c8fea2 SE |
25 | #include "soft-interface.h" |
26 | #include "hard-interface.h" | |
27 | #include "icmp_socket.h" | |
28 | #include "translation-table.h" | |
29 | #include "originator.h" | |
c6c8fea2 | 30 | #include "vis.h" |
c6c8fea2 | 31 | #include "unicast.h" |
23721387 | 32 | #include "bridge_loop_avoidance.h" |
c6c8fea2 | 33 | |
a7f6ee94 SW |
34 | static int route_unicast_packet(struct sk_buff *skb, |
35 | struct hard_iface *recv_if); | |
36 | ||
e6c10f43 | 37 | void slide_own_bcast_window(struct hard_iface *hard_iface) |
c6c8fea2 | 38 | { |
e6c10f43 | 39 | struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
c6c8fea2 | 40 | struct hashtable_t *hash = bat_priv->orig_hash; |
7aadf889 | 41 | struct hlist_node *node; |
c6c8fea2 | 42 | struct hlist_head *head; |
c6c8fea2 SE |
43 | struct orig_node *orig_node; |
44 | unsigned long *word; | |
c90681b8 | 45 | uint32_t i; |
c6c8fea2 SE |
46 | size_t word_index; |
47 | ||
c6c8fea2 SE |
48 | for (i = 0; i < hash->size; i++) { |
49 | head = &hash->table[i]; | |
50 | ||
fb778ea1 | 51 | rcu_read_lock(); |
7aadf889 | 52 | hlist_for_each_entry_rcu(orig_node, node, head, hash_entry) { |
2ae2daf6 | 53 | spin_lock_bh(&orig_node->ogm_cnt_lock); |
e6c10f43 | 54 | word_index = hard_iface->if_num * NUM_WORDS; |
c6c8fea2 SE |
55 | word = &(orig_node->bcast_own[word_index]); |
56 | ||
57 | bit_get_packet(bat_priv, word, 1, 0); | |
e6c10f43 | 58 | orig_node->bcast_own_sum[hard_iface->if_num] = |
0079d2ce | 59 | bitmap_weight(word, TQ_LOCAL_WINDOW_SIZE); |
2ae2daf6 | 60 | spin_unlock_bh(&orig_node->ogm_cnt_lock); |
c6c8fea2 | 61 | } |
fb778ea1 | 62 | rcu_read_unlock(); |
c6c8fea2 | 63 | } |
c6c8fea2 SE |
64 | } |
65 | ||
fc957275 ML |
66 | static void _update_route(struct bat_priv *bat_priv, |
67 | struct orig_node *orig_node, | |
68 | struct neigh_node *neigh_node) | |
c6c8fea2 | 69 | { |
e1a5382f LL |
70 | struct neigh_node *curr_router; |
71 | ||
72 | curr_router = orig_node_get_router(orig_node); | |
a8e7f4bc | 73 | |
c6c8fea2 | 74 | /* route deleted */ |
e1a5382f | 75 | if ((curr_router) && (!neigh_node)) { |
c6c8fea2 SE |
76 | bat_dbg(DBG_ROUTES, bat_priv, "Deleting route towards: %pM\n", |
77 | orig_node->orig); | |
2dafb49d | 78 | tt_global_del_orig(bat_priv, orig_node, |
7c64fd98 | 79 | "Deleted route towards originator"); |
c6c8fea2 | 80 | |
e1a5382f LL |
81 | /* route added */ |
82 | } else if ((!curr_router) && (neigh_node)) { | |
c6c8fea2 SE |
83 | |
84 | bat_dbg(DBG_ROUTES, bat_priv, | |
85 | "Adding route towards: %pM (via %pM)\n", | |
86 | orig_node->orig, neigh_node->addr); | |
e1a5382f | 87 | /* route changed */ |
bb899b89 | 88 | } else if (neigh_node && curr_router) { |
c6c8fea2 | 89 | bat_dbg(DBG_ROUTES, bat_priv, |
86ceb360 | 90 | "Changing route towards: %pM (now via %pM - was via %pM)\n", |
c6c8fea2 | 91 | orig_node->orig, neigh_node->addr, |
e1a5382f | 92 | curr_router->addr); |
c6c8fea2 SE |
93 | } |
94 | ||
e1a5382f LL |
95 | if (curr_router) |
96 | neigh_node_free_ref(curr_router); | |
97 | ||
98 | /* increase refcount of new best neighbor */ | |
44524fcd ML |
99 | if (neigh_node && !atomic_inc_not_zero(&neigh_node->refcount)) |
100 | neigh_node = NULL; | |
e1a5382f LL |
101 | |
102 | spin_lock_bh(&orig_node->neigh_list_lock); | |
103 | rcu_assign_pointer(orig_node->router, neigh_node); | |
104 | spin_unlock_bh(&orig_node->neigh_list_lock); | |
105 | ||
106 | /* decrease refcount of previous best neighbor */ | |
107 | if (curr_router) | |
108 | neigh_node_free_ref(curr_router); | |
c6c8fea2 SE |
109 | } |
110 | ||
fc957275 ML |
111 | void update_route(struct bat_priv *bat_priv, struct orig_node *orig_node, |
112 | struct neigh_node *neigh_node) | |
c6c8fea2 | 113 | { |
e1a5382f | 114 | struct neigh_node *router = NULL; |
c6c8fea2 SE |
115 | |
116 | if (!orig_node) | |
e1a5382f LL |
117 | goto out; |
118 | ||
119 | router = orig_node_get_router(orig_node); | |
c6c8fea2 | 120 | |
e1a5382f | 121 | if (router != neigh_node) |
fc957275 | 122 | _update_route(bat_priv, orig_node, neigh_node); |
e1a5382f LL |
123 | |
124 | out: | |
125 | if (router) | |
126 | neigh_node_free_ref(router); | |
c6c8fea2 SE |
127 | } |
128 | ||
a4c135c5 SW |
129 | /* caller must hold the neigh_list_lock */ |
130 | void bonding_candidate_del(struct orig_node *orig_node, | |
131 | struct neigh_node *neigh_node) | |
132 | { | |
133 | /* this neighbor is not part of our candidate list */ | |
134 | if (list_empty(&neigh_node->bonding_list)) | |
135 | goto out; | |
136 | ||
137 | list_del_rcu(&neigh_node->bonding_list); | |
a4c135c5 | 138 | INIT_LIST_HEAD(&neigh_node->bonding_list); |
44524fcd | 139 | neigh_node_free_ref(neigh_node); |
a4c135c5 SW |
140 | atomic_dec(&orig_node->bond_candidates); |
141 | ||
142 | out: | |
143 | return; | |
144 | } | |
145 | ||
fc957275 ML |
146 | void bonding_candidate_add(struct orig_node *orig_node, |
147 | struct neigh_node *neigh_node) | |
a4c135c5 SW |
148 | { |
149 | struct hlist_node *node; | |
e1a5382f LL |
150 | struct neigh_node *tmp_neigh_node, *router = NULL; |
151 | uint8_t interference_candidate = 0; | |
a4c135c5 SW |
152 | |
153 | spin_lock_bh(&orig_node->neigh_list_lock); | |
154 | ||
155 | /* only consider if it has the same primary address ... */ | |
39901e71 ML |
156 | if (!compare_eth(orig_node->orig, |
157 | neigh_node->orig_node->primary_addr)) | |
a4c135c5 SW |
158 | goto candidate_del; |
159 | ||
e1a5382f LL |
160 | router = orig_node_get_router(orig_node); |
161 | if (!router) | |
a4c135c5 SW |
162 | goto candidate_del; |
163 | ||
a4c135c5 | 164 | /* ... and is good enough to be considered */ |
e1a5382f | 165 | if (neigh_node->tq_avg < router->tq_avg - BONDING_TQ_THRESHOLD) |
a4c135c5 SW |
166 | goto candidate_del; |
167 | ||
168 | /** | |
169 | * check if we have another candidate with the same mac address or | |
170 | * interface. If we do, we won't select this candidate because of | |
171 | * possible interference. | |
172 | */ | |
173 | hlist_for_each_entry_rcu(tmp_neigh_node, node, | |
174 | &orig_node->neigh_list, list) { | |
175 | ||
176 | if (tmp_neigh_node == neigh_node) | |
177 | continue; | |
178 | ||
179 | /* we only care if the other candidate is even | |
180 | * considered as candidate. */ | |
181 | if (list_empty(&tmp_neigh_node->bonding_list)) | |
182 | continue; | |
183 | ||
184 | if ((neigh_node->if_incoming == tmp_neigh_node->if_incoming) || | |
39901e71 | 185 | (compare_eth(neigh_node->addr, tmp_neigh_node->addr))) { |
a4c135c5 SW |
186 | interference_candidate = 1; |
187 | break; | |
188 | } | |
189 | } | |
190 | ||
191 | /* don't care further if it is an interference candidate */ | |
192 | if (interference_candidate) | |
193 | goto candidate_del; | |
194 | ||
195 | /* this neighbor already is part of our candidate list */ | |
196 | if (!list_empty(&neigh_node->bonding_list)) | |
197 | goto out; | |
198 | ||
44524fcd ML |
199 | if (!atomic_inc_not_zero(&neigh_node->refcount)) |
200 | goto out; | |
201 | ||
a4c135c5 | 202 | list_add_rcu(&neigh_node->bonding_list, &orig_node->bond_list); |
a4c135c5 SW |
203 | atomic_inc(&orig_node->bond_candidates); |
204 | goto out; | |
205 | ||
206 | candidate_del: | |
207 | bonding_candidate_del(orig_node, neigh_node); | |
208 | ||
209 | out: | |
210 | spin_unlock_bh(&orig_node->neigh_list_lock); | |
e1a5382f LL |
211 | |
212 | if (router) | |
213 | neigh_node_free_ref(router); | |
a4c135c5 SW |
214 | } |
215 | ||
216 | /* copy primary address for bonding */ | |
fc957275 ML |
217 | void bonding_save_primary(const struct orig_node *orig_node, |
218 | struct orig_node *orig_neigh_node, | |
219 | const struct batman_ogm_packet *batman_ogm_packet) | |
a4c135c5 | 220 | { |
b6da4bf5 | 221 | if (!(batman_ogm_packet->flags & PRIMARIES_FIRST_HOP)) |
a4c135c5 SW |
222 | return; |
223 | ||
224 | memcpy(orig_neigh_node->primary_addr, orig_node->orig, ETH_ALEN); | |
225 | } | |
226 | ||
c6c8fea2 SE |
227 | /* checks whether the host restarted and is in the protection time. |
228 | * returns: | |
229 | * 0 if the packet is to be accepted | |
230 | * 1 if the packet is to be ignored. | |
231 | */ | |
fc957275 ML |
232 | int window_protected(struct bat_priv *bat_priv, int32_t seq_num_diff, |
233 | unsigned long *last_reset) | |
c6c8fea2 | 234 | { |
7c64fd98 SE |
235 | if ((seq_num_diff <= -TQ_LOCAL_WINDOW_SIZE) || |
236 | (seq_num_diff >= EXPECTED_SEQNO_RANGE)) { | |
032b7969 | 237 | if (has_timed_out(*last_reset, RESET_PROTECTION_MS)) { |
c6c8fea2 SE |
238 | |
239 | *last_reset = jiffies; | |
240 | bat_dbg(DBG_BATMAN, bat_priv, | |
241 | "old packet received, start protection\n"); | |
242 | ||
243 | return 0; | |
96741ade | 244 | } else { |
c6c8fea2 | 245 | return 1; |
96741ade | 246 | } |
c6c8fea2 SE |
247 | } |
248 | return 0; | |
249 | } | |
250 | ||
c3e29312 ML |
251 | bool check_management_packet(struct sk_buff *skb, |
252 | struct hard_iface *hard_iface, | |
253 | int header_len) | |
c6c8fea2 | 254 | { |
c6c8fea2 SE |
255 | struct ethhdr *ethhdr; |
256 | ||
257 | /* drop packet if it has not necessary minimum size */ | |
c3e29312 ML |
258 | if (unlikely(!pskb_may_pull(skb, header_len))) |
259 | return false; | |
c6c8fea2 SE |
260 | |
261 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
262 | ||
263 | /* packet with broadcast indication but unicast recipient */ | |
264 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) | |
c3e29312 | 265 | return false; |
c6c8fea2 SE |
266 | |
267 | /* packet with broadcast sender address */ | |
268 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
c3e29312 | 269 | return false; |
c6c8fea2 SE |
270 | |
271 | /* create a copy of the skb, if needed, to modify it. */ | |
272 | if (skb_cow(skb, 0) < 0) | |
c3e29312 | 273 | return false; |
c6c8fea2 SE |
274 | |
275 | /* keep skb linear */ | |
276 | if (skb_linearize(skb) < 0) | |
c3e29312 | 277 | return false; |
c6c8fea2 | 278 | |
c3e29312 | 279 | return true; |
c6c8fea2 SE |
280 | } |
281 | ||
282 | static int recv_my_icmp_packet(struct bat_priv *bat_priv, | |
283 | struct sk_buff *skb, size_t icmp_len) | |
284 | { | |
32ae9b22 | 285 | struct hard_iface *primary_if = NULL; |
44524fcd | 286 | struct orig_node *orig_node = NULL; |
e1a5382f | 287 | struct neigh_node *router = NULL; |
c6c8fea2 | 288 | struct icmp_packet_rr *icmp_packet; |
44524fcd | 289 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
290 | |
291 | icmp_packet = (struct icmp_packet_rr *)skb->data; | |
c6c8fea2 SE |
292 | |
293 | /* add data to device queue */ | |
294 | if (icmp_packet->msg_type != ECHO_REQUEST) { | |
295 | bat_socket_receive_packet(icmp_packet, icmp_len); | |
44524fcd | 296 | goto out; |
c6c8fea2 SE |
297 | } |
298 | ||
32ae9b22 ML |
299 | primary_if = primary_if_get_selected(bat_priv); |
300 | if (!primary_if) | |
44524fcd | 301 | goto out; |
c6c8fea2 SE |
302 | |
303 | /* answer echo request (ping) */ | |
304 | /* get routing information */ | |
7aadf889 | 305 | orig_node = orig_hash_find(bat_priv, icmp_packet->orig); |
44524fcd | 306 | if (!orig_node) |
e1a5382f | 307 | goto out; |
c6c8fea2 | 308 | |
e1a5382f LL |
309 | router = orig_node_get_router(orig_node); |
310 | if (!router) | |
311 | goto out; | |
c6c8fea2 | 312 | |
44524fcd | 313 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 314 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd ML |
315 | goto out; |
316 | ||
317 | icmp_packet = (struct icmp_packet_rr *)skb->data; | |
318 | ||
319 | memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN); | |
32ae9b22 | 320 | memcpy(icmp_packet->orig, primary_if->net_dev->dev_addr, ETH_ALEN); |
44524fcd | 321 | icmp_packet->msg_type = ECHO_REPLY; |
76543d14 | 322 | icmp_packet->header.ttl = TTL; |
44524fcd | 323 | |
e1a5382f | 324 | send_skb_packet(skb, router->if_incoming, router->addr); |
44524fcd | 325 | ret = NET_RX_SUCCESS; |
c6c8fea2 | 326 | |
44524fcd | 327 | out: |
32ae9b22 ML |
328 | if (primary_if) |
329 | hardif_free_ref(primary_if); | |
e1a5382f LL |
330 | if (router) |
331 | neigh_node_free_ref(router); | |
44524fcd | 332 | if (orig_node) |
7b36e8ee | 333 | orig_node_free_ref(orig_node); |
c6c8fea2 SE |
334 | return ret; |
335 | } | |
336 | ||
337 | static int recv_icmp_ttl_exceeded(struct bat_priv *bat_priv, | |
74ef1153 | 338 | struct sk_buff *skb) |
c6c8fea2 | 339 | { |
32ae9b22 | 340 | struct hard_iface *primary_if = NULL; |
44524fcd | 341 | struct orig_node *orig_node = NULL; |
e1a5382f | 342 | struct neigh_node *router = NULL; |
c6c8fea2 | 343 | struct icmp_packet *icmp_packet; |
44524fcd | 344 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
345 | |
346 | icmp_packet = (struct icmp_packet *)skb->data; | |
c6c8fea2 SE |
347 | |
348 | /* send TTL exceeded if packet is an echo request (traceroute) */ | |
349 | if (icmp_packet->msg_type != ECHO_REQUEST) { | |
86ceb360 SE |
350 | pr_debug("Warning - can't forward icmp packet from %pM to %pM: ttl exceeded\n", |
351 | icmp_packet->orig, icmp_packet->dst); | |
44524fcd | 352 | goto out; |
c6c8fea2 SE |
353 | } |
354 | ||
32ae9b22 ML |
355 | primary_if = primary_if_get_selected(bat_priv); |
356 | if (!primary_if) | |
44524fcd | 357 | goto out; |
c6c8fea2 SE |
358 | |
359 | /* get routing information */ | |
7aadf889 | 360 | orig_node = orig_hash_find(bat_priv, icmp_packet->orig); |
44524fcd | 361 | if (!orig_node) |
e1a5382f | 362 | goto out; |
c6c8fea2 | 363 | |
e1a5382f LL |
364 | router = orig_node_get_router(orig_node); |
365 | if (!router) | |
366 | goto out; | |
c6c8fea2 | 367 | |
44524fcd | 368 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 369 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd | 370 | goto out; |
c6c8fea2 | 371 | |
44524fcd | 372 | icmp_packet = (struct icmp_packet *)skb->data; |
c6c8fea2 | 373 | |
44524fcd | 374 | memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN); |
32ae9b22 | 375 | memcpy(icmp_packet->orig, primary_if->net_dev->dev_addr, ETH_ALEN); |
44524fcd | 376 | icmp_packet->msg_type = TTL_EXCEEDED; |
76543d14 | 377 | icmp_packet->header.ttl = TTL; |
44524fcd | 378 | |
e1a5382f | 379 | send_skb_packet(skb, router->if_incoming, router->addr); |
44524fcd | 380 | ret = NET_RX_SUCCESS; |
c6c8fea2 | 381 | |
44524fcd | 382 | out: |
32ae9b22 ML |
383 | if (primary_if) |
384 | hardif_free_ref(primary_if); | |
e1a5382f LL |
385 | if (router) |
386 | neigh_node_free_ref(router); | |
44524fcd | 387 | if (orig_node) |
7b36e8ee | 388 | orig_node_free_ref(orig_node); |
c6c8fea2 SE |
389 | return ret; |
390 | } | |
391 | ||
392 | ||
e6c10f43 | 393 | int recv_icmp_packet(struct sk_buff *skb, struct hard_iface *recv_if) |
c6c8fea2 SE |
394 | { |
395 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
396 | struct icmp_packet_rr *icmp_packet; | |
397 | struct ethhdr *ethhdr; | |
44524fcd | 398 | struct orig_node *orig_node = NULL; |
e1a5382f | 399 | struct neigh_node *router = NULL; |
c6c8fea2 | 400 | int hdr_size = sizeof(struct icmp_packet); |
44524fcd | 401 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
402 | |
403 | /** | |
404 | * we truncate all incoming icmp packets if they don't match our size | |
405 | */ | |
406 | if (skb->len >= sizeof(struct icmp_packet_rr)) | |
407 | hdr_size = sizeof(struct icmp_packet_rr); | |
408 | ||
409 | /* drop packet if it has not necessary minimum size */ | |
410 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
44524fcd | 411 | goto out; |
c6c8fea2 SE |
412 | |
413 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
414 | ||
415 | /* packet with unicast indication but broadcast recipient */ | |
416 | if (is_broadcast_ether_addr(ethhdr->h_dest)) | |
44524fcd | 417 | goto out; |
c6c8fea2 SE |
418 | |
419 | /* packet with broadcast sender address */ | |
420 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
44524fcd | 421 | goto out; |
c6c8fea2 SE |
422 | |
423 | /* not for me */ | |
424 | if (!is_my_mac(ethhdr->h_dest)) | |
44524fcd | 425 | goto out; |
c6c8fea2 SE |
426 | |
427 | icmp_packet = (struct icmp_packet_rr *)skb->data; | |
428 | ||
429 | /* add record route information if not full */ | |
430 | if ((hdr_size == sizeof(struct icmp_packet_rr)) && | |
431 | (icmp_packet->rr_cur < BAT_RR_LEN)) { | |
432 | memcpy(&(icmp_packet->rr[icmp_packet->rr_cur]), | |
7c64fd98 | 433 | ethhdr->h_dest, ETH_ALEN); |
c6c8fea2 SE |
434 | icmp_packet->rr_cur++; |
435 | } | |
436 | ||
437 | /* packet for me */ | |
438 | if (is_my_mac(icmp_packet->dst)) | |
439 | return recv_my_icmp_packet(bat_priv, skb, hdr_size); | |
440 | ||
441 | /* TTL exceeded */ | |
76543d14 | 442 | if (icmp_packet->header.ttl < 2) |
74ef1153 | 443 | return recv_icmp_ttl_exceeded(bat_priv, skb); |
c6c8fea2 | 444 | |
c6c8fea2 | 445 | /* get routing information */ |
7aadf889 | 446 | orig_node = orig_hash_find(bat_priv, icmp_packet->dst); |
44524fcd | 447 | if (!orig_node) |
e1a5382f | 448 | goto out; |
c6c8fea2 | 449 | |
e1a5382f LL |
450 | router = orig_node_get_router(orig_node); |
451 | if (!router) | |
452 | goto out; | |
c6c8fea2 | 453 | |
44524fcd | 454 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 455 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd | 456 | goto out; |
c6c8fea2 | 457 | |
44524fcd | 458 | icmp_packet = (struct icmp_packet_rr *)skb->data; |
c6c8fea2 | 459 | |
44524fcd | 460 | /* decrement ttl */ |
76543d14 | 461 | icmp_packet->header.ttl--; |
44524fcd ML |
462 | |
463 | /* route it */ | |
e1a5382f | 464 | send_skb_packet(skb, router->if_incoming, router->addr); |
44524fcd | 465 | ret = NET_RX_SUCCESS; |
c6c8fea2 | 466 | |
44524fcd | 467 | out: |
e1a5382f LL |
468 | if (router) |
469 | neigh_node_free_ref(router); | |
44524fcd | 470 | if (orig_node) |
7b36e8ee | 471 | orig_node_free_ref(orig_node); |
c6c8fea2 SE |
472 | return ret; |
473 | } | |
474 | ||
55158629 LL |
475 | /* In the bonding case, send the packets in a round |
476 | * robin fashion over the remaining interfaces. | |
477 | * | |
478 | * This method rotates the bonding list and increases the | |
479 | * returned router's refcount. */ | |
480 | static struct neigh_node *find_bond_router(struct orig_node *primary_orig, | |
747e4221 | 481 | const struct hard_iface *recv_if) |
55158629 LL |
482 | { |
483 | struct neigh_node *tmp_neigh_node; | |
484 | struct neigh_node *router = NULL, *first_candidate = NULL; | |
485 | ||
486 | rcu_read_lock(); | |
487 | list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list, | |
488 | bonding_list) { | |
489 | if (!first_candidate) | |
490 | first_candidate = tmp_neigh_node; | |
491 | ||
492 | /* recv_if == NULL on the first node. */ | |
493 | if (tmp_neigh_node->if_incoming == recv_if) | |
494 | continue; | |
495 | ||
496 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) | |
497 | continue; | |
498 | ||
499 | router = tmp_neigh_node; | |
500 | break; | |
501 | } | |
502 | ||
503 | /* use the first candidate if nothing was found. */ | |
504 | if (!router && first_candidate && | |
505 | atomic_inc_not_zero(&first_candidate->refcount)) | |
506 | router = first_candidate; | |
507 | ||
508 | if (!router) | |
509 | goto out; | |
510 | ||
511 | /* selected should point to the next element | |
512 | * after the current router */ | |
513 | spin_lock_bh(&primary_orig->neigh_list_lock); | |
514 | /* this is a list_move(), which unfortunately | |
515 | * does not exist as rcu version */ | |
516 | list_del_rcu(&primary_orig->bond_list); | |
517 | list_add_rcu(&primary_orig->bond_list, | |
518 | &router->bonding_list); | |
519 | spin_unlock_bh(&primary_orig->neigh_list_lock); | |
520 | ||
521 | out: | |
522 | rcu_read_unlock(); | |
523 | return router; | |
524 | } | |
525 | ||
526 | /* Interface Alternating: Use the best of the | |
527 | * remaining candidates which are not using | |
528 | * this interface. | |
529 | * | |
530 | * Increases the returned router's refcount */ | |
531 | static struct neigh_node *find_ifalter_router(struct orig_node *primary_orig, | |
747e4221 | 532 | const struct hard_iface *recv_if) |
55158629 LL |
533 | { |
534 | struct neigh_node *tmp_neigh_node; | |
535 | struct neigh_node *router = NULL, *first_candidate = NULL; | |
536 | ||
537 | rcu_read_lock(); | |
538 | list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list, | |
539 | bonding_list) { | |
540 | if (!first_candidate) | |
541 | first_candidate = tmp_neigh_node; | |
542 | ||
543 | /* recv_if == NULL on the first node. */ | |
544 | if (tmp_neigh_node->if_incoming == recv_if) | |
545 | continue; | |
546 | ||
547 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) | |
548 | continue; | |
549 | ||
550 | /* if we don't have a router yet | |
551 | * or this one is better, choose it. */ | |
552 | if ((!router) || | |
553 | (tmp_neigh_node->tq_avg > router->tq_avg)) { | |
554 | /* decrement refcount of | |
555 | * previously selected router */ | |
556 | if (router) | |
557 | neigh_node_free_ref(router); | |
558 | ||
559 | router = tmp_neigh_node; | |
560 | atomic_inc_not_zero(&router->refcount); | |
561 | } | |
562 | ||
563 | neigh_node_free_ref(tmp_neigh_node); | |
564 | } | |
565 | ||
566 | /* use the first candidate if nothing was found. */ | |
567 | if (!router && first_candidate && | |
568 | atomic_inc_not_zero(&first_candidate->refcount)) | |
569 | router = first_candidate; | |
570 | ||
571 | rcu_read_unlock(); | |
572 | return router; | |
573 | } | |
574 | ||
a73105b8 AQ |
575 | int recv_tt_query(struct sk_buff *skb, struct hard_iface *recv_if) |
576 | { | |
577 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
578 | struct tt_query_packet *tt_query; | |
8b7342d6 | 579 | uint16_t tt_len; |
a73105b8 AQ |
580 | struct ethhdr *ethhdr; |
581 | ||
582 | /* drop packet if it has not necessary minimum size */ | |
583 | if (unlikely(!pskb_may_pull(skb, sizeof(struct tt_query_packet)))) | |
584 | goto out; | |
585 | ||
586 | /* I could need to modify it */ | |
587 | if (skb_cow(skb, sizeof(struct tt_query_packet)) < 0) | |
588 | goto out; | |
589 | ||
590 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
591 | ||
592 | /* packet with unicast indication but broadcast recipient */ | |
593 | if (is_broadcast_ether_addr(ethhdr->h_dest)) | |
594 | goto out; | |
595 | ||
596 | /* packet with broadcast sender address */ | |
597 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
598 | goto out; | |
599 | ||
600 | tt_query = (struct tt_query_packet *)skb->data; | |
601 | ||
602 | tt_query->tt_data = ntohs(tt_query->tt_data); | |
603 | ||
604 | switch (tt_query->flags & TT_QUERY_TYPE_MASK) { | |
605 | case TT_REQUEST: | |
606 | /* If we cannot provide an answer the tt_request is | |
607 | * forwarded */ | |
608 | if (!send_tt_response(bat_priv, tt_query)) { | |
609 | bat_dbg(DBG_TT, bat_priv, | |
610 | "Routing TT_REQUEST to %pM [%c]\n", | |
611 | tt_query->dst, | |
612 | (tt_query->flags & TT_FULL_TABLE ? 'F' : '.')); | |
613 | tt_query->tt_data = htons(tt_query->tt_data); | |
614 | return route_unicast_packet(skb, recv_if); | |
615 | } | |
616 | break; | |
617 | case TT_RESPONSE: | |
dc58fe32 AQ |
618 | if (is_my_mac(tt_query->dst)) { |
619 | /* packet needs to be linearized to access the TT | |
620 | * changes */ | |
621 | if (skb_linearize(skb) < 0) | |
622 | goto out; | |
a73105b8 | 623 | |
8b7342d6 AQ |
624 | tt_len = tt_query->tt_data * sizeof(struct tt_change); |
625 | ||
626 | /* Ensure we have all the claimed data */ | |
627 | if (unlikely(skb_headlen(skb) < | |
69497c17 | 628 | sizeof(struct tt_query_packet) + tt_len)) |
8b7342d6 AQ |
629 | goto out; |
630 | ||
a73105b8 | 631 | handle_tt_response(bat_priv, tt_query); |
dc58fe32 | 632 | } else { |
a73105b8 AQ |
633 | bat_dbg(DBG_TT, bat_priv, |
634 | "Routing TT_RESPONSE to %pM [%c]\n", | |
635 | tt_query->dst, | |
636 | (tt_query->flags & TT_FULL_TABLE ? 'F' : '.')); | |
637 | tt_query->tt_data = htons(tt_query->tt_data); | |
638 | return route_unicast_packet(skb, recv_if); | |
639 | } | |
640 | break; | |
641 | } | |
642 | ||
643 | out: | |
644 | /* returning NET_RX_DROP will make the caller function kfree the skb */ | |
645 | return NET_RX_DROP; | |
646 | } | |
647 | ||
cc47f66e AQ |
648 | int recv_roam_adv(struct sk_buff *skb, struct hard_iface *recv_if) |
649 | { | |
650 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
651 | struct roam_adv_packet *roam_adv_packet; | |
652 | struct orig_node *orig_node; | |
653 | struct ethhdr *ethhdr; | |
654 | ||
655 | /* drop packet if it has not necessary minimum size */ | |
656 | if (unlikely(!pskb_may_pull(skb, sizeof(struct roam_adv_packet)))) | |
657 | goto out; | |
658 | ||
659 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
660 | ||
661 | /* packet with unicast indication but broadcast recipient */ | |
662 | if (is_broadcast_ether_addr(ethhdr->h_dest)) | |
663 | goto out; | |
664 | ||
665 | /* packet with broadcast sender address */ | |
666 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
667 | goto out; | |
668 | ||
669 | roam_adv_packet = (struct roam_adv_packet *)skb->data; | |
670 | ||
671 | if (!is_my_mac(roam_adv_packet->dst)) | |
672 | return route_unicast_packet(skb, recv_if); | |
673 | ||
20ff9d59 SW |
674 | /* check if it is a backbone gateway. we don't accept |
675 | * roaming advertisement from it, as it has the same | |
676 | * entries as we have. | |
677 | */ | |
678 | if (bla_is_backbone_gw_orig(bat_priv, roam_adv_packet->src)) | |
679 | goto out; | |
680 | ||
cc47f66e AQ |
681 | orig_node = orig_hash_find(bat_priv, roam_adv_packet->src); |
682 | if (!orig_node) | |
683 | goto out; | |
684 | ||
86ceb360 SE |
685 | bat_dbg(DBG_TT, bat_priv, |
686 | "Received ROAMING_ADV from %pM (client %pM)\n", | |
687 | roam_adv_packet->src, roam_adv_packet->client); | |
cc47f66e AQ |
688 | |
689 | tt_global_add(bat_priv, orig_node, roam_adv_packet->client, | |
bc279080 | 690 | atomic_read(&orig_node->last_ttvn) + 1, true, false); |
cc47f66e AQ |
691 | |
692 | /* Roaming phase starts: I have new information but the ttvn has not | |
693 | * been incremented yet. This flag will make me check all the incoming | |
694 | * packets for the correct destination. */ | |
695 | bat_priv->tt_poss_change = true; | |
696 | ||
697 | orig_node_free_ref(orig_node); | |
698 | out: | |
699 | /* returning NET_RX_DROP will make the caller function kfree the skb */ | |
700 | return NET_RX_DROP; | |
701 | } | |
702 | ||
c6c8fea2 | 703 | /* find a suitable router for this originator, and use |
a4c135c5 SW |
704 | * bonding if possible. increases the found neighbors |
705 | * refcount.*/ | |
c6c8fea2 SE |
706 | struct neigh_node *find_router(struct bat_priv *bat_priv, |
707 | struct orig_node *orig_node, | |
747e4221 | 708 | const struct hard_iface *recv_if) |
c6c8fea2 SE |
709 | { |
710 | struct orig_node *primary_orig_node; | |
711 | struct orig_node *router_orig; | |
55158629 | 712 | struct neigh_node *router; |
c6c8fea2 SE |
713 | static uint8_t zero_mac[ETH_ALEN] = {0, 0, 0, 0, 0, 0}; |
714 | int bonding_enabled; | |
715 | ||
716 | if (!orig_node) | |
717 | return NULL; | |
718 | ||
e1a5382f LL |
719 | router = orig_node_get_router(orig_node); |
720 | if (!router) | |
01df2b65 | 721 | goto err; |
c6c8fea2 SE |
722 | |
723 | /* without bonding, the first node should | |
724 | * always choose the default router. */ | |
c6c8fea2 SE |
725 | bonding_enabled = atomic_read(&bat_priv->bonding); |
726 | ||
a4c135c5 SW |
727 | rcu_read_lock(); |
728 | /* select default router to output */ | |
e1a5382f | 729 | router_orig = router->orig_node; |
01df2b65 ML |
730 | if (!router_orig) |
731 | goto err_unlock; | |
a4c135c5 | 732 | |
a4c135c5 SW |
733 | if ((!recv_if) && (!bonding_enabled)) |
734 | goto return_router; | |
c6c8fea2 SE |
735 | |
736 | /* if we have something in the primary_addr, we can search | |
737 | * for a potential bonding candidate. */ | |
39901e71 | 738 | if (compare_eth(router_orig->primary_addr, zero_mac)) |
a4c135c5 | 739 | goto return_router; |
c6c8fea2 SE |
740 | |
741 | /* find the orig_node which has the primary interface. might | |
742 | * even be the same as our router_orig in many cases */ | |
743 | ||
39901e71 | 744 | if (compare_eth(router_orig->primary_addr, router_orig->orig)) { |
c6c8fea2 SE |
745 | primary_orig_node = router_orig; |
746 | } else { | |
7aadf889 ML |
747 | primary_orig_node = orig_hash_find(bat_priv, |
748 | router_orig->primary_addr); | |
c6c8fea2 | 749 | if (!primary_orig_node) |
a4c135c5 | 750 | goto return_router; |
7aadf889 | 751 | |
7b36e8ee | 752 | orig_node_free_ref(primary_orig_node); |
c6c8fea2 SE |
753 | } |
754 | ||
755 | /* with less than 2 candidates, we can't do any | |
756 | * bonding and prefer the original router. */ | |
a4c135c5 SW |
757 | if (atomic_read(&primary_orig_node->bond_candidates) < 2) |
758 | goto return_router; | |
c6c8fea2 | 759 | |
c6c8fea2 SE |
760 | /* all nodes between should choose a candidate which |
761 | * is is not on the interface where the packet came | |
762 | * in. */ | |
a4c135c5 | 763 | |
44524fcd | 764 | neigh_node_free_ref(router); |
c6c8fea2 | 765 | |
55158629 LL |
766 | if (bonding_enabled) |
767 | router = find_bond_router(primary_orig_node, recv_if); | |
768 | else | |
769 | router = find_ifalter_router(primary_orig_node, recv_if); | |
c6c8fea2 | 770 | |
a4c135c5 | 771 | return_router: |
e2cbc11c AQ |
772 | if (router && router->if_incoming->if_status != IF_ACTIVE) |
773 | goto err_unlock; | |
774 | ||
a4c135c5 | 775 | rcu_read_unlock(); |
c6c8fea2 | 776 | return router; |
01df2b65 ML |
777 | err_unlock: |
778 | rcu_read_unlock(); | |
779 | err: | |
780 | if (router) | |
781 | neigh_node_free_ref(router); | |
782 | return NULL; | |
c6c8fea2 SE |
783 | } |
784 | ||
785 | static int check_unicast_packet(struct sk_buff *skb, int hdr_size) | |
786 | { | |
787 | struct ethhdr *ethhdr; | |
788 | ||
789 | /* drop packet if it has not necessary minimum size */ | |
790 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
791 | return -1; | |
792 | ||
793 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
794 | ||
795 | /* packet with unicast indication but broadcast recipient */ | |
796 | if (is_broadcast_ether_addr(ethhdr->h_dest)) | |
797 | return -1; | |
798 | ||
799 | /* packet with broadcast sender address */ | |
800 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
801 | return -1; | |
802 | ||
803 | /* not for me */ | |
804 | if (!is_my_mac(ethhdr->h_dest)) | |
805 | return -1; | |
806 | ||
807 | return 0; | |
808 | } | |
809 | ||
a7f6ee94 | 810 | static int route_unicast_packet(struct sk_buff *skb, struct hard_iface *recv_if) |
c6c8fea2 SE |
811 | { |
812 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
44524fcd ML |
813 | struct orig_node *orig_node = NULL; |
814 | struct neigh_node *neigh_node = NULL; | |
c6c8fea2 SE |
815 | struct unicast_packet *unicast_packet; |
816 | struct ethhdr *ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
44524fcd | 817 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
818 | struct sk_buff *new_skb; |
819 | ||
820 | unicast_packet = (struct unicast_packet *)skb->data; | |
821 | ||
822 | /* TTL exceeded */ | |
76543d14 | 823 | if (unicast_packet->header.ttl < 2) { |
86ceb360 SE |
824 | pr_debug("Warning - can't forward unicast packet from %pM to %pM: ttl exceeded\n", |
825 | ethhdr->h_source, unicast_packet->dest); | |
44524fcd | 826 | goto out; |
c6c8fea2 SE |
827 | } |
828 | ||
829 | /* get routing information */ | |
7aadf889 ML |
830 | orig_node = orig_hash_find(bat_priv, unicast_packet->dest); |
831 | ||
44524fcd | 832 | if (!orig_node) |
b5a6f69c | 833 | goto out; |
c6c8fea2 | 834 | |
a4c135c5 | 835 | /* find_router() increases neigh_nodes refcount if found. */ |
44524fcd | 836 | neigh_node = find_router(bat_priv, orig_node, recv_if); |
c6c8fea2 | 837 | |
d0072609 | 838 | if (!neigh_node) |
44524fcd | 839 | goto out; |
c6c8fea2 SE |
840 | |
841 | /* create a copy of the skb, if needed, to modify it. */ | |
0d125074 | 842 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd | 843 | goto out; |
c6c8fea2 SE |
844 | |
845 | unicast_packet = (struct unicast_packet *)skb->data; | |
846 | ||
76543d14 | 847 | if (unicast_packet->header.packet_type == BAT_UNICAST && |
c6c8fea2 | 848 | atomic_read(&bat_priv->fragmentation) && |
d0072609 ML |
849 | skb->len > neigh_node->if_incoming->net_dev->mtu) { |
850 | ret = frag_send_skb(skb, bat_priv, | |
851 | neigh_node->if_incoming, neigh_node->addr); | |
852 | goto out; | |
853 | } | |
c6c8fea2 | 854 | |
76543d14 | 855 | if (unicast_packet->header.packet_type == BAT_UNICAST_FRAG && |
d0072609 | 856 | frag_can_reassemble(skb, neigh_node->if_incoming->net_dev->mtu)) { |
c6c8fea2 SE |
857 | |
858 | ret = frag_reassemble_skb(skb, bat_priv, &new_skb); | |
859 | ||
860 | if (ret == NET_RX_DROP) | |
44524fcd | 861 | goto out; |
c6c8fea2 SE |
862 | |
863 | /* packet was buffered for late merge */ | |
44524fcd ML |
864 | if (!new_skb) { |
865 | ret = NET_RX_SUCCESS; | |
866 | goto out; | |
867 | } | |
c6c8fea2 SE |
868 | |
869 | skb = new_skb; | |
870 | unicast_packet = (struct unicast_packet *)skb->data; | |
871 | } | |
872 | ||
873 | /* decrement ttl */ | |
76543d14 | 874 | unicast_packet->header.ttl--; |
c6c8fea2 SE |
875 | |
876 | /* route it */ | |
d0072609 | 877 | send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); |
44524fcd | 878 | ret = NET_RX_SUCCESS; |
c6c8fea2 | 879 | |
44524fcd ML |
880 | out: |
881 | if (neigh_node) | |
882 | neigh_node_free_ref(neigh_node); | |
883 | if (orig_node) | |
7b36e8ee | 884 | orig_node_free_ref(orig_node); |
44524fcd | 885 | return ret; |
c6c8fea2 SE |
886 | } |
887 | ||
a73105b8 AQ |
888 | static int check_unicast_ttvn(struct bat_priv *bat_priv, |
889 | struct sk_buff *skb) { | |
890 | uint8_t curr_ttvn; | |
891 | struct orig_node *orig_node; | |
892 | struct ethhdr *ethhdr; | |
893 | struct hard_iface *primary_if; | |
894 | struct unicast_packet *unicast_packet; | |
cc47f66e | 895 | bool tt_poss_change; |
a73105b8 AQ |
896 | |
897 | /* I could need to modify it */ | |
898 | if (skb_cow(skb, sizeof(struct unicast_packet)) < 0) | |
899 | return 0; | |
900 | ||
901 | unicast_packet = (struct unicast_packet *)skb->data; | |
902 | ||
cc47f66e AQ |
903 | if (is_my_mac(unicast_packet->dest)) { |
904 | tt_poss_change = bat_priv->tt_poss_change; | |
a73105b8 | 905 | curr_ttvn = (uint8_t)atomic_read(&bat_priv->ttvn); |
cc47f66e | 906 | } else { |
a73105b8 AQ |
907 | orig_node = orig_hash_find(bat_priv, unicast_packet->dest); |
908 | ||
909 | if (!orig_node) | |
910 | return 0; | |
911 | ||
912 | curr_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn); | |
cc47f66e | 913 | tt_poss_change = orig_node->tt_poss_change; |
a73105b8 AQ |
914 | orig_node_free_ref(orig_node); |
915 | } | |
916 | ||
917 | /* Check whether I have to reroute the packet */ | |
cc47f66e | 918 | if (seq_before(unicast_packet->ttvn, curr_ttvn) || tt_poss_change) { |
8710e261 AQ |
919 | /* check if there is enough data before accessing it */ |
920 | if (pskb_may_pull(skb, sizeof(struct unicast_packet) + | |
921 | ETH_HLEN) < 0) | |
a73105b8 AQ |
922 | return 0; |
923 | ||
924 | ethhdr = (struct ethhdr *)(skb->data + | |
925 | sizeof(struct unicast_packet)); | |
3d393e47 | 926 | orig_node = transtable_search(bat_priv, NULL, ethhdr->h_dest); |
a73105b8 AQ |
927 | |
928 | if (!orig_node) { | |
929 | if (!is_my_client(bat_priv, ethhdr->h_dest)) | |
930 | return 0; | |
931 | primary_if = primary_if_get_selected(bat_priv); | |
932 | if (!primary_if) | |
933 | return 0; | |
934 | memcpy(unicast_packet->dest, | |
935 | primary_if->net_dev->dev_addr, ETH_ALEN); | |
936 | hardif_free_ref(primary_if); | |
937 | } else { | |
938 | memcpy(unicast_packet->dest, orig_node->orig, | |
939 | ETH_ALEN); | |
940 | curr_ttvn = (uint8_t) | |
941 | atomic_read(&orig_node->last_ttvn); | |
942 | orig_node_free_ref(orig_node); | |
943 | } | |
944 | ||
86ceb360 SE |
945 | bat_dbg(DBG_ROUTES, bat_priv, |
946 | "TTVN mismatch (old_ttvn %u new_ttvn %u)! Rerouting unicast packet (for %pM) to %pM\n", | |
947 | unicast_packet->ttvn, curr_ttvn, ethhdr->h_dest, | |
948 | unicast_packet->dest); | |
a73105b8 AQ |
949 | |
950 | unicast_packet->ttvn = curr_ttvn; | |
951 | } | |
952 | return 1; | |
953 | } | |
954 | ||
e6c10f43 | 955 | int recv_unicast_packet(struct sk_buff *skb, struct hard_iface *recv_if) |
c6c8fea2 | 956 | { |
a73105b8 | 957 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
c6c8fea2 | 958 | struct unicast_packet *unicast_packet; |
704509b8 | 959 | int hdr_size = sizeof(*unicast_packet); |
c6c8fea2 SE |
960 | |
961 | if (check_unicast_packet(skb, hdr_size) < 0) | |
962 | return NET_RX_DROP; | |
963 | ||
a73105b8 AQ |
964 | if (!check_unicast_ttvn(bat_priv, skb)) |
965 | return NET_RX_DROP; | |
966 | ||
c6c8fea2 SE |
967 | unicast_packet = (struct unicast_packet *)skb->data; |
968 | ||
969 | /* packet for me */ | |
970 | if (is_my_mac(unicast_packet->dest)) { | |
971 | interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size); | |
972 | return NET_RX_SUCCESS; | |
973 | } | |
974 | ||
7cefb149 | 975 | return route_unicast_packet(skb, recv_if); |
c6c8fea2 SE |
976 | } |
977 | ||
e6c10f43 | 978 | int recv_ucast_frag_packet(struct sk_buff *skb, struct hard_iface *recv_if) |
c6c8fea2 SE |
979 | { |
980 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
981 | struct unicast_frag_packet *unicast_packet; | |
704509b8 | 982 | int hdr_size = sizeof(*unicast_packet); |
c6c8fea2 SE |
983 | struct sk_buff *new_skb = NULL; |
984 | int ret; | |
985 | ||
986 | if (check_unicast_packet(skb, hdr_size) < 0) | |
987 | return NET_RX_DROP; | |
988 | ||
a73105b8 AQ |
989 | if (!check_unicast_ttvn(bat_priv, skb)) |
990 | return NET_RX_DROP; | |
991 | ||
c6c8fea2 SE |
992 | unicast_packet = (struct unicast_frag_packet *)skb->data; |
993 | ||
994 | /* packet for me */ | |
995 | if (is_my_mac(unicast_packet->dest)) { | |
996 | ||
997 | ret = frag_reassemble_skb(skb, bat_priv, &new_skb); | |
998 | ||
999 | if (ret == NET_RX_DROP) | |
1000 | return NET_RX_DROP; | |
1001 | ||
1002 | /* packet was buffered for late merge */ | |
1003 | if (!new_skb) | |
1004 | return NET_RX_SUCCESS; | |
1005 | ||
1006 | interface_rx(recv_if->soft_iface, new_skb, recv_if, | |
1007 | sizeof(struct unicast_packet)); | |
1008 | return NET_RX_SUCCESS; | |
1009 | } | |
1010 | ||
7cefb149 | 1011 | return route_unicast_packet(skb, recv_if); |
c6c8fea2 SE |
1012 | } |
1013 | ||
1014 | ||
e6c10f43 | 1015 | int recv_bcast_packet(struct sk_buff *skb, struct hard_iface *recv_if) |
c6c8fea2 SE |
1016 | { |
1017 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
f3e0008f | 1018 | struct orig_node *orig_node = NULL; |
c6c8fea2 SE |
1019 | struct bcast_packet *bcast_packet; |
1020 | struct ethhdr *ethhdr; | |
704509b8 | 1021 | int hdr_size = sizeof(*bcast_packet); |
f3e0008f | 1022 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
1023 | int32_t seq_diff; |
1024 | ||
1025 | /* drop packet if it has not necessary minimum size */ | |
1026 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
f3e0008f | 1027 | goto out; |
c6c8fea2 SE |
1028 | |
1029 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
1030 | ||
1031 | /* packet with broadcast indication but unicast recipient */ | |
1032 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) | |
f3e0008f | 1033 | goto out; |
c6c8fea2 SE |
1034 | |
1035 | /* packet with broadcast sender address */ | |
1036 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
f3e0008f | 1037 | goto out; |
c6c8fea2 SE |
1038 | |
1039 | /* ignore broadcasts sent by myself */ | |
1040 | if (is_my_mac(ethhdr->h_source)) | |
f3e0008f | 1041 | goto out; |
c6c8fea2 SE |
1042 | |
1043 | bcast_packet = (struct bcast_packet *)skb->data; | |
1044 | ||
1045 | /* ignore broadcasts originated by myself */ | |
1046 | if (is_my_mac(bcast_packet->orig)) | |
f3e0008f | 1047 | goto out; |
c6c8fea2 | 1048 | |
76543d14 | 1049 | if (bcast_packet->header.ttl < 2) |
f3e0008f | 1050 | goto out; |
c6c8fea2 | 1051 | |
7aadf889 | 1052 | orig_node = orig_hash_find(bat_priv, bcast_packet->orig); |
f3e0008f ML |
1053 | |
1054 | if (!orig_node) | |
b5a6f69c | 1055 | goto out; |
c6c8fea2 | 1056 | |
f3e0008f | 1057 | spin_lock_bh(&orig_node->bcast_seqno_lock); |
c6c8fea2 SE |
1058 | |
1059 | /* check whether the packet is a duplicate */ | |
0079d2ce SE |
1060 | if (bat_test_bit(orig_node->bcast_bits, orig_node->last_bcast_seqno, |
1061 | ntohl(bcast_packet->seqno))) | |
f3e0008f | 1062 | goto spin_unlock; |
c6c8fea2 SE |
1063 | |
1064 | seq_diff = ntohl(bcast_packet->seqno) - orig_node->last_bcast_seqno; | |
1065 | ||
1066 | /* check whether the packet is old and the host just restarted. */ | |
1067 | if (window_protected(bat_priv, seq_diff, | |
f3e0008f ML |
1068 | &orig_node->bcast_seqno_reset)) |
1069 | goto spin_unlock; | |
c6c8fea2 SE |
1070 | |
1071 | /* mark broadcast in flood history, update window position | |
1072 | * if required. */ | |
1073 | if (bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1)) | |
1074 | orig_node->last_bcast_seqno = ntohl(bcast_packet->seqno); | |
1075 | ||
f3e0008f | 1076 | spin_unlock_bh(&orig_node->bcast_seqno_lock); |
f3e0008f | 1077 | |
fe2da6ff SW |
1078 | /* check whether this has been sent by another originator before */ |
1079 | if (bla_check_bcast_duplist(bat_priv, bcast_packet, hdr_size)) | |
1080 | goto out; | |
1081 | ||
c6c8fea2 | 1082 | /* rebroadcast packet */ |
8698529d | 1083 | add_bcast_packet_to_list(bat_priv, skb, 1); |
c6c8fea2 | 1084 | |
23721387 SW |
1085 | /* don't hand the broadcast up if it is from an originator |
1086 | * from the same backbone. | |
1087 | */ | |
1088 | if (bla_is_backbone_gw(skb, orig_node, hdr_size)) | |
1089 | goto out; | |
1090 | ||
c6c8fea2 SE |
1091 | /* broadcast for me */ |
1092 | interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size); | |
f3e0008f ML |
1093 | ret = NET_RX_SUCCESS; |
1094 | goto out; | |
c6c8fea2 | 1095 | |
f3e0008f ML |
1096 | spin_unlock: |
1097 | spin_unlock_bh(&orig_node->bcast_seqno_lock); | |
f3e0008f ML |
1098 | out: |
1099 | if (orig_node) | |
7b36e8ee | 1100 | orig_node_free_ref(orig_node); |
f3e0008f | 1101 | return ret; |
c6c8fea2 SE |
1102 | } |
1103 | ||
e6c10f43 | 1104 | int recv_vis_packet(struct sk_buff *skb, struct hard_iface *recv_if) |
c6c8fea2 SE |
1105 | { |
1106 | struct vis_packet *vis_packet; | |
1107 | struct ethhdr *ethhdr; | |
1108 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
704509b8 | 1109 | int hdr_size = sizeof(*vis_packet); |
c6c8fea2 SE |
1110 | |
1111 | /* keep skb linear */ | |
1112 | if (skb_linearize(skb) < 0) | |
1113 | return NET_RX_DROP; | |
1114 | ||
1115 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
1116 | return NET_RX_DROP; | |
1117 | ||
1118 | vis_packet = (struct vis_packet *)skb->data; | |
1119 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
1120 | ||
1121 | /* not for me */ | |
1122 | if (!is_my_mac(ethhdr->h_dest)) | |
1123 | return NET_RX_DROP; | |
1124 | ||
1125 | /* ignore own packets */ | |
1126 | if (is_my_mac(vis_packet->vis_orig)) | |
1127 | return NET_RX_DROP; | |
1128 | ||
1129 | if (is_my_mac(vis_packet->sender_orig)) | |
1130 | return NET_RX_DROP; | |
1131 | ||
1132 | switch (vis_packet->vis_type) { | |
1133 | case VIS_TYPE_SERVER_SYNC: | |
1134 | receive_server_sync_packet(bat_priv, vis_packet, | |
1135 | skb_headlen(skb)); | |
1136 | break; | |
1137 | ||
1138 | case VIS_TYPE_CLIENT_UPDATE: | |
1139 | receive_client_update_packet(bat_priv, vis_packet, | |
1140 | skb_headlen(skb)); | |
1141 | break; | |
1142 | ||
1143 | default: /* ignore unknown packet */ | |
1144 | break; | |
1145 | } | |
1146 | ||
1147 | /* We take a copy of the data in the packet, so we should | |
1148 | always free the skbuf. */ | |
1149 | return NET_RX_DROP; | |
1150 | } |