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e19f9759 | 1 | /* Copyright (C) 2007-2014 B.A.T.M.A.N. contributors: |
c6c8fea2 SE |
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 | |
ebf38fb7 | 15 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
c6c8fea2 SE |
16 | */ |
17 | ||
95a066d8 SE |
18 | #include <linux/crc32c.h> |
19 | #include <linux/highmem.h> | |
c54f38c9 SW |
20 | #include <linux/if_vlan.h> |
21 | #include <net/ip.h> | |
22 | #include <net/ipv6.h> | |
23 | #include <net/dsfield.h> | |
c6c8fea2 | 24 | #include "main.h" |
b706b13b SE |
25 | #include "sysfs.h" |
26 | #include "debugfs.h" | |
c6c8fea2 SE |
27 | #include "routing.h" |
28 | #include "send.h" | |
29 | #include "originator.h" | |
30 | #include "soft-interface.h" | |
31 | #include "icmp_socket.h" | |
32 | #include "translation-table.h" | |
33 | #include "hard-interface.h" | |
34 | #include "gateway_client.h" | |
23721387 | 35 | #include "bridge_loop_avoidance.h" |
2f1dfbe1 | 36 | #include "distributed-arp-table.h" |
c5caf4ef | 37 | #include "multicast.h" |
414254e3 | 38 | #include "gateway_common.h" |
c6c8fea2 | 39 | #include "hash.h" |
1c280471 | 40 | #include "bat_algo.h" |
d353d8d4 | 41 | #include "network-coding.h" |
610bfc6b | 42 | #include "fragmentation.h" |
c6c8fea2 | 43 | |
c3caf519 SE |
44 | |
45 | /* List manipulations on hardif_list have to be rtnl_lock()'ed, | |
9cfc7bd6 SE |
46 | * list traversals just rcu-locked |
47 | */ | |
3193e8fd | 48 | struct list_head batadv_hardif_list; |
ee11ad61 | 49 | static int (*batadv_rx_handler[256])(struct sk_buff *, |
56303d34 | 50 | struct batadv_hard_iface *); |
3193e8fd | 51 | char batadv_routing_algo[20] = "BATMAN_IV"; |
ee11ad61 | 52 | static struct hlist_head batadv_algo_list; |
c6c8fea2 | 53 | |
3193e8fd | 54 | unsigned char batadv_broadcast_addr[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; |
c6c8fea2 | 55 | |
3193e8fd | 56 | struct workqueue_struct *batadv_event_workqueue; |
c6c8fea2 | 57 | |
ee11ad61 | 58 | static void batadv_recv_handler_init(void); |
ffa995e0 | 59 | |
ee11ad61 | 60 | static int __init batadv_init(void) |
c6c8fea2 | 61 | { |
3193e8fd | 62 | INIT_LIST_HEAD(&batadv_hardif_list); |
ee11ad61 | 63 | INIT_HLIST_HEAD(&batadv_algo_list); |
1c280471 | 64 | |
ee11ad61 | 65 | batadv_recv_handler_init(); |
ffa995e0 | 66 | |
81c524f7 | 67 | batadv_iv_init(); |
6c519bad | 68 | batadv_nc_init(); |
c6c8fea2 | 69 | |
3193e8fd | 70 | batadv_event_workqueue = create_singlethread_workqueue("bat_events"); |
c6c8fea2 | 71 | |
3193e8fd | 72 | if (!batadv_event_workqueue) |
c6c8fea2 SE |
73 | return -ENOMEM; |
74 | ||
9039dc7e | 75 | batadv_socket_init(); |
40a072d7 | 76 | batadv_debugfs_init(); |
c6c8fea2 | 77 | |
9563877e | 78 | register_netdevice_notifier(&batadv_hard_if_notifier); |
a4ac28c0 | 79 | rtnl_link_register(&batadv_link_ops); |
c6c8fea2 | 80 | |
86ceb360 | 81 | pr_info("B.A.T.M.A.N. advanced %s (compatibility version %i) loaded\n", |
42d0b044 | 82 | BATADV_SOURCE_VERSION, BATADV_COMPAT_VERSION); |
c6c8fea2 SE |
83 | |
84 | return 0; | |
85 | } | |
86 | ||
ee11ad61 | 87 | static void __exit batadv_exit(void) |
c6c8fea2 | 88 | { |
40a072d7 | 89 | batadv_debugfs_destroy(); |
a4ac28c0 | 90 | rtnl_link_unregister(&batadv_link_ops); |
9563877e SE |
91 | unregister_netdevice_notifier(&batadv_hard_if_notifier); |
92 | batadv_hardif_remove_interfaces(); | |
c6c8fea2 | 93 | |
3193e8fd SE |
94 | flush_workqueue(batadv_event_workqueue); |
95 | destroy_workqueue(batadv_event_workqueue); | |
96 | batadv_event_workqueue = NULL; | |
c6c8fea2 SE |
97 | |
98 | rcu_barrier(); | |
99 | } | |
100 | ||
3193e8fd | 101 | int batadv_mesh_init(struct net_device *soft_iface) |
c6c8fea2 | 102 | { |
56303d34 | 103 | struct batadv_priv *bat_priv = netdev_priv(soft_iface); |
5346c35e | 104 | int ret; |
c6c8fea2 | 105 | |
c6c8fea2 SE |
106 | spin_lock_init(&bat_priv->forw_bat_list_lock); |
107 | spin_lock_init(&bat_priv->forw_bcast_list_lock); | |
807736f6 SE |
108 | spin_lock_init(&bat_priv->tt.changes_list_lock); |
109 | spin_lock_init(&bat_priv->tt.req_list_lock); | |
110 | spin_lock_init(&bat_priv->tt.roam_list_lock); | |
111 | spin_lock_init(&bat_priv->tt.last_changeset_lock); | |
a70a9aa9 | 112 | spin_lock_init(&bat_priv->tt.commit_lock); |
807736f6 | 113 | spin_lock_init(&bat_priv->gw.list_lock); |
ef261577 ML |
114 | spin_lock_init(&bat_priv->tvlv.container_list_lock); |
115 | spin_lock_init(&bat_priv->tvlv.handler_list_lock); | |
5d2c05b2 | 116 | spin_lock_init(&bat_priv->softif_vlan_list_lock); |
c6c8fea2 SE |
117 | |
118 | INIT_HLIST_HEAD(&bat_priv->forw_bat_list); | |
119 | INIT_HLIST_HEAD(&bat_priv->forw_bcast_list); | |
807736f6 SE |
120 | INIT_HLIST_HEAD(&bat_priv->gw.list); |
121 | INIT_LIST_HEAD(&bat_priv->tt.changes_list); | |
122 | INIT_LIST_HEAD(&bat_priv->tt.req_list); | |
123 | INIT_LIST_HEAD(&bat_priv->tt.roam_list); | |
c5caf4ef LL |
124 | #ifdef CONFIG_BATMAN_ADV_MCAST |
125 | INIT_HLIST_HEAD(&bat_priv->mcast.mla_list); | |
126 | #endif | |
ef261577 ML |
127 | INIT_HLIST_HEAD(&bat_priv->tvlv.container_list); |
128 | INIT_HLIST_HEAD(&bat_priv->tvlv.handler_list); | |
5d2c05b2 | 129 | INIT_HLIST_HEAD(&bat_priv->softif_vlan_list); |
c6c8fea2 | 130 | |
7d211efc | 131 | ret = batadv_originator_init(bat_priv); |
5346c35e | 132 | if (ret < 0) |
c6c8fea2 SE |
133 | goto err; |
134 | ||
08c36d3e | 135 | ret = batadv_tt_init(bat_priv); |
5346c35e | 136 | if (ret < 0) |
c6c8fea2 SE |
137 | goto err; |
138 | ||
08adf151 | 139 | ret = batadv_bla_init(bat_priv); |
5346c35e | 140 | if (ret < 0) |
23721387 SW |
141 | goto err; |
142 | ||
2f1dfbe1 AQ |
143 | ret = batadv_dat_init(bat_priv); |
144 | if (ret < 0) | |
145 | goto err; | |
146 | ||
6c519bad | 147 | ret = batadv_nc_mesh_init(bat_priv); |
d353d8d4 MH |
148 | if (ret < 0) |
149 | goto err; | |
150 | ||
414254e3 ML |
151 | batadv_gw_init(bat_priv); |
152 | ||
807736f6 | 153 | atomic_set(&bat_priv->gw.reselect, 0); |
39c75a51 | 154 | atomic_set(&bat_priv->mesh_state, BATADV_MESH_ACTIVE); |
5346c35e SE |
155 | |
156 | return 0; | |
c6c8fea2 SE |
157 | |
158 | err: | |
3193e8fd | 159 | batadv_mesh_free(soft_iface); |
5346c35e | 160 | return ret; |
c6c8fea2 SE |
161 | } |
162 | ||
3193e8fd | 163 | void batadv_mesh_free(struct net_device *soft_iface) |
c6c8fea2 | 164 | { |
56303d34 | 165 | struct batadv_priv *bat_priv = netdev_priv(soft_iface); |
c6c8fea2 | 166 | |
39c75a51 | 167 | atomic_set(&bat_priv->mesh_state, BATADV_MESH_DEACTIVATING); |
c6c8fea2 | 168 | |
9455e34c | 169 | batadv_purge_outstanding_packets(bat_priv, NULL); |
c6c8fea2 | 170 | |
7cf06bc6 | 171 | batadv_gw_node_purge(bat_priv); |
6c519bad | 172 | batadv_nc_mesh_free(bat_priv); |
a4361860 AQ |
173 | batadv_dat_free(bat_priv); |
174 | batadv_bla_free(bat_priv); | |
c6c8fea2 | 175 | |
c5caf4ef LL |
176 | batadv_mcast_free(bat_priv); |
177 | ||
a4361860 AQ |
178 | /* Free the TT and the originator tables only after having terminated |
179 | * all the other depending components which may use these structures for | |
180 | * their purposes. | |
181 | */ | |
08c36d3e | 182 | batadv_tt_free(bat_priv); |
c6c8fea2 | 183 | |
a4361860 AQ |
184 | /* Since the originator table clean up routine is accessing the TT |
185 | * tables as well, it has to be invoked after the TT tables have been | |
186 | * freed and marked as empty. This ensures that no cleanup RCU callbacks | |
187 | * accessing the TT data are scheduled for later execution. | |
188 | */ | |
189 | batadv_originator_free(bat_priv); | |
2f1dfbe1 | 190 | |
414254e3 ML |
191 | batadv_gw_free(bat_priv); |
192 | ||
f8214865 | 193 | free_percpu(bat_priv->bat_counters); |
f69ae770 | 194 | bat_priv->bat_counters = NULL; |
f8214865 | 195 | |
39c75a51 | 196 | atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE); |
c6c8fea2 SE |
197 | } |
198 | ||
6e0895c2 DM |
199 | /** |
200 | * batadv_is_my_mac - check if the given mac address belongs to any of the real | |
201 | * interfaces in the current mesh | |
202 | * @bat_priv: the bat priv with all the soft interface information | |
203 | * @addr: the address to check | |
204 | */ | |
fe8a93b9 | 205 | int batadv_is_my_mac(struct batadv_priv *bat_priv, const uint8_t *addr) |
c6c8fea2 | 206 | { |
56303d34 | 207 | const struct batadv_hard_iface *hard_iface; |
c6c8fea2 SE |
208 | |
209 | rcu_read_lock(); | |
3193e8fd | 210 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e9a4f295 | 211 | if (hard_iface->if_status != BATADV_IF_ACTIVE) |
c6c8fea2 SE |
212 | continue; |
213 | ||
fe8a93b9 AQ |
214 | if (hard_iface->soft_iface != bat_priv->soft_iface) |
215 | continue; | |
216 | ||
1eda58bf | 217 | if (batadv_compare_eth(hard_iface->net_dev->dev_addr, addr)) { |
c6c8fea2 SE |
218 | rcu_read_unlock(); |
219 | return 1; | |
220 | } | |
221 | } | |
222 | rcu_read_unlock(); | |
223 | return 0; | |
c6c8fea2 SE |
224 | } |
225 | ||
30da63a6 ML |
226 | /** |
227 | * batadv_seq_print_text_primary_if_get - called from debugfs table printing | |
228 | * function that requires the primary interface | |
229 | * @seq: debugfs table seq_file struct | |
230 | * | |
231 | * Returns primary interface if found or NULL otherwise. | |
232 | */ | |
233 | struct batadv_hard_iface * | |
234 | batadv_seq_print_text_primary_if_get(struct seq_file *seq) | |
235 | { | |
236 | struct net_device *net_dev = (struct net_device *)seq->private; | |
237 | struct batadv_priv *bat_priv = netdev_priv(net_dev); | |
238 | struct batadv_hard_iface *primary_if; | |
239 | ||
240 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
241 | ||
242 | if (!primary_if) { | |
243 | seq_printf(seq, | |
244 | "BATMAN mesh %s disabled - please specify interfaces to enable it\n", | |
245 | net_dev->name); | |
246 | goto out; | |
247 | } | |
248 | ||
249 | if (primary_if->if_status == BATADV_IF_ACTIVE) | |
250 | goto out; | |
251 | ||
252 | seq_printf(seq, | |
253 | "BATMAN mesh %s disabled - primary interface not active\n", | |
254 | net_dev->name); | |
255 | batadv_hardif_free_ref(primary_if); | |
256 | primary_if = NULL; | |
257 | ||
258 | out: | |
259 | return primary_if; | |
260 | } | |
261 | ||
411d6ed9 ML |
262 | /** |
263 | * batadv_max_header_len - calculate maximum encapsulation overhead for a | |
264 | * payload packet | |
265 | * | |
266 | * Return the maximum encapsulation overhead in bytes. | |
267 | */ | |
268 | int batadv_max_header_len(void) | |
269 | { | |
270 | int header_len = 0; | |
271 | ||
272 | header_len = max_t(int, header_len, | |
273 | sizeof(struct batadv_unicast_packet)); | |
274 | header_len = max_t(int, header_len, | |
275 | sizeof(struct batadv_unicast_4addr_packet)); | |
276 | header_len = max_t(int, header_len, | |
277 | sizeof(struct batadv_bcast_packet)); | |
278 | ||
279 | #ifdef CONFIG_BATMAN_ADV_NC | |
280 | header_len = max_t(int, header_len, | |
281 | sizeof(struct batadv_coded_packet)); | |
282 | #endif | |
283 | ||
1df0cbd5 | 284 | return header_len + ETH_HLEN; |
411d6ed9 ML |
285 | } |
286 | ||
c54f38c9 SW |
287 | /** |
288 | * batadv_skb_set_priority - sets skb priority according to packet content | |
289 | * @skb: the packet to be sent | |
290 | * @offset: offset to the packet content | |
291 | * | |
292 | * This function sets a value between 256 and 263 (802.1d priority), which | |
293 | * can be interpreted by the cfg80211 or other drivers. | |
294 | */ | |
295 | void batadv_skb_set_priority(struct sk_buff *skb, int offset) | |
296 | { | |
297 | struct iphdr ip_hdr_tmp, *ip_hdr; | |
298 | struct ipv6hdr ip6_hdr_tmp, *ip6_hdr; | |
299 | struct ethhdr ethhdr_tmp, *ethhdr; | |
300 | struct vlan_ethhdr *vhdr, vhdr_tmp; | |
301 | u32 prio; | |
302 | ||
303 | /* already set, do nothing */ | |
304 | if (skb->priority >= 256 && skb->priority <= 263) | |
305 | return; | |
306 | ||
307 | ethhdr = skb_header_pointer(skb, offset, sizeof(*ethhdr), ðhdr_tmp); | |
308 | if (!ethhdr) | |
309 | return; | |
310 | ||
311 | switch (ethhdr->h_proto) { | |
312 | case htons(ETH_P_8021Q): | |
313 | vhdr = skb_header_pointer(skb, offset + sizeof(*vhdr), | |
314 | sizeof(*vhdr), &vhdr_tmp); | |
315 | if (!vhdr) | |
316 | return; | |
317 | prio = ntohs(vhdr->h_vlan_TCI) & VLAN_PRIO_MASK; | |
318 | prio = prio >> VLAN_PRIO_SHIFT; | |
319 | break; | |
320 | case htons(ETH_P_IP): | |
321 | ip_hdr = skb_header_pointer(skb, offset + sizeof(*ethhdr), | |
322 | sizeof(*ip_hdr), &ip_hdr_tmp); | |
323 | if (!ip_hdr) | |
324 | return; | |
325 | prio = (ipv4_get_dsfield(ip_hdr) & 0xfc) >> 5; | |
326 | break; | |
327 | case htons(ETH_P_IPV6): | |
328 | ip6_hdr = skb_header_pointer(skb, offset + sizeof(*ethhdr), | |
329 | sizeof(*ip6_hdr), &ip6_hdr_tmp); | |
330 | if (!ip6_hdr) | |
331 | return; | |
332 | prio = (ipv6_get_dsfield(ip6_hdr) & 0xfc) >> 5; | |
333 | break; | |
334 | default: | |
335 | return; | |
336 | } | |
337 | ||
338 | skb->priority = prio + 256; | |
339 | } | |
340 | ||
ee11ad61 | 341 | static int batadv_recv_unhandled_packet(struct sk_buff *skb, |
56303d34 | 342 | struct batadv_hard_iface *recv_if) |
ffa995e0 ML |
343 | { |
344 | return NET_RX_DROP; | |
345 | } | |
346 | ||
347 | /* incoming packets with the batman ethertype received on any active hard | |
348 | * interface | |
349 | */ | |
3193e8fd SE |
350 | int batadv_batman_skb_recv(struct sk_buff *skb, struct net_device *dev, |
351 | struct packet_type *ptype, | |
352 | struct net_device *orig_dev) | |
ffa995e0 | 353 | { |
56303d34 | 354 | struct batadv_priv *bat_priv; |
96412690 | 355 | struct batadv_ogm_packet *batadv_ogm_packet; |
56303d34 | 356 | struct batadv_hard_iface *hard_iface; |
ffa995e0 ML |
357 | uint8_t idx; |
358 | int ret; | |
359 | ||
56303d34 SE |
360 | hard_iface = container_of(ptype, struct batadv_hard_iface, |
361 | batman_adv_ptype); | |
ffa995e0 ML |
362 | skb = skb_share_check(skb, GFP_ATOMIC); |
363 | ||
364 | /* skb was released by skb_share_check() */ | |
365 | if (!skb) | |
366 | goto err_out; | |
367 | ||
368 | /* packet should hold at least type and version */ | |
369 | if (unlikely(!pskb_may_pull(skb, 2))) | |
370 | goto err_free; | |
371 | ||
372 | /* expect a valid ethernet header here. */ | |
373 | if (unlikely(skb->mac_len != ETH_HLEN || !skb_mac_header(skb))) | |
374 | goto err_free; | |
375 | ||
376 | if (!hard_iface->soft_iface) | |
377 | goto err_free; | |
378 | ||
379 | bat_priv = netdev_priv(hard_iface->soft_iface); | |
380 | ||
39c75a51 | 381 | if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) |
ffa995e0 ML |
382 | goto err_free; |
383 | ||
384 | /* discard frames on not active interfaces */ | |
e9a4f295 | 385 | if (hard_iface->if_status != BATADV_IF_ACTIVE) |
ffa995e0 ML |
386 | goto err_free; |
387 | ||
96412690 | 388 | batadv_ogm_packet = (struct batadv_ogm_packet *)skb->data; |
ffa995e0 | 389 | |
a40d9b07 | 390 | if (batadv_ogm_packet->version != BATADV_COMPAT_VERSION) { |
39c75a51 | 391 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 392 | "Drop packet: incompatible batman version (%i)\n", |
a40d9b07 | 393 | batadv_ogm_packet->version); |
ffa995e0 ML |
394 | goto err_free; |
395 | } | |
396 | ||
397 | /* all receive handlers return whether they received or reused | |
398 | * the supplied skb. if not, we have to free the skb. | |
399 | */ | |
a40d9b07 | 400 | idx = batadv_ogm_packet->packet_type; |
ee11ad61 | 401 | ret = (*batadv_rx_handler[idx])(skb, hard_iface); |
ffa995e0 ML |
402 | |
403 | if (ret == NET_RX_DROP) | |
404 | kfree_skb(skb); | |
405 | ||
406 | /* return NET_RX_SUCCESS in any case as we | |
407 | * most probably dropped the packet for | |
408 | * routing-logical reasons. | |
409 | */ | |
410 | return NET_RX_SUCCESS; | |
411 | ||
412 | err_free: | |
413 | kfree_skb(skb); | |
414 | err_out: | |
415 | return NET_RX_DROP; | |
416 | } | |
417 | ||
ee11ad61 | 418 | static void batadv_recv_handler_init(void) |
ffa995e0 ML |
419 | { |
420 | int i; | |
421 | ||
ee11ad61 SE |
422 | for (i = 0; i < ARRAY_SIZE(batadv_rx_handler); i++) |
423 | batadv_rx_handler[i] = batadv_recv_unhandled_packet; | |
ffa995e0 | 424 | |
a1f1ac5c SW |
425 | for (i = BATADV_UNICAST_MIN; i <= BATADV_UNICAST_MAX; i++) |
426 | batadv_rx_handler[i] = batadv_recv_unhandled_unicast_packet; | |
427 | ||
031ace8d SW |
428 | /* compile time checks for sizes */ |
429 | BUILD_BUG_ON(sizeof(struct batadv_bla_claim_dst) != 6); | |
430 | BUILD_BUG_ON(sizeof(struct batadv_ogm_packet) != 24); | |
431 | BUILD_BUG_ON(sizeof(struct batadv_icmp_header) != 20); | |
432 | BUILD_BUG_ON(sizeof(struct batadv_icmp_packet) != 20); | |
433 | BUILD_BUG_ON(sizeof(struct batadv_icmp_packet_rr) != 116); | |
434 | BUILD_BUG_ON(sizeof(struct batadv_unicast_packet) != 10); | |
435 | BUILD_BUG_ON(sizeof(struct batadv_unicast_4addr_packet) != 18); | |
436 | BUILD_BUG_ON(sizeof(struct batadv_frag_packet) != 20); | |
437 | BUILD_BUG_ON(sizeof(struct batadv_bcast_packet) != 14); | |
438 | BUILD_BUG_ON(sizeof(struct batadv_coded_packet) != 46); | |
439 | BUILD_BUG_ON(sizeof(struct batadv_unicast_tvlv_packet) != 20); | |
440 | BUILD_BUG_ON(sizeof(struct batadv_tvlv_hdr) != 4); | |
441 | BUILD_BUG_ON(sizeof(struct batadv_tvlv_gateway_data) != 8); | |
442 | BUILD_BUG_ON(sizeof(struct batadv_tvlv_tt_vlan_data) != 8); | |
443 | BUILD_BUG_ON(sizeof(struct batadv_tvlv_tt_change) != 12); | |
444 | BUILD_BUG_ON(sizeof(struct batadv_tvlv_roam_adv) != 8); | |
80067c83 | 445 | |
a1f1ac5c SW |
446 | /* broadcast packet */ |
447 | batadv_rx_handler[BATADV_BCAST] = batadv_recv_bcast_packet; | |
448 | ||
449 | /* unicast packets ... */ | |
7cdcf6dd AQ |
450 | /* unicast with 4 addresses packet */ |
451 | batadv_rx_handler[BATADV_UNICAST_4ADDR] = batadv_recv_unicast_packet; | |
ffa995e0 | 452 | /* unicast packet */ |
acd34afa | 453 | batadv_rx_handler[BATADV_UNICAST] = batadv_recv_unicast_packet; |
ef261577 ML |
454 | /* unicast tvlv packet */ |
455 | batadv_rx_handler[BATADV_UNICAST_TVLV] = batadv_recv_unicast_tvlv; | |
a1f1ac5c SW |
456 | /* batman icmp packet */ |
457 | batadv_rx_handler[BATADV_ICMP] = batadv_recv_icmp_packet; | |
610bfc6b MH |
458 | /* Fragmented packets */ |
459 | batadv_rx_handler[BATADV_UNICAST_FRAG] = batadv_recv_frag_packet; | |
ffa995e0 ML |
460 | } |
461 | ||
56303d34 SE |
462 | int |
463 | batadv_recv_handler_register(uint8_t packet_type, | |
464 | int (*recv_handler)(struct sk_buff *, | |
465 | struct batadv_hard_iface *)) | |
ffa995e0 | 466 | { |
a1f1ac5c SW |
467 | int (*curr)(struct sk_buff *, |
468 | struct batadv_hard_iface *); | |
469 | curr = batadv_rx_handler[packet_type]; | |
470 | ||
471 | if ((curr != batadv_recv_unhandled_packet) && | |
472 | (curr != batadv_recv_unhandled_unicast_packet)) | |
ffa995e0 ML |
473 | return -EBUSY; |
474 | ||
ee11ad61 | 475 | batadv_rx_handler[packet_type] = recv_handler; |
ffa995e0 ML |
476 | return 0; |
477 | } | |
478 | ||
3193e8fd | 479 | void batadv_recv_handler_unregister(uint8_t packet_type) |
ffa995e0 | 480 | { |
ee11ad61 | 481 | batadv_rx_handler[packet_type] = batadv_recv_unhandled_packet; |
ffa995e0 ML |
482 | } |
483 | ||
56303d34 | 484 | static struct batadv_algo_ops *batadv_algo_get(char *name) |
1c280471 | 485 | { |
56303d34 | 486 | struct batadv_algo_ops *bat_algo_ops = NULL, *bat_algo_ops_tmp; |
1c280471 | 487 | |
b67bfe0d | 488 | hlist_for_each_entry(bat_algo_ops_tmp, &batadv_algo_list, list) { |
1c280471 ML |
489 | if (strcmp(bat_algo_ops_tmp->name, name) != 0) |
490 | continue; | |
491 | ||
492 | bat_algo_ops = bat_algo_ops_tmp; | |
493 | break; | |
494 | } | |
495 | ||
496 | return bat_algo_ops; | |
497 | } | |
498 | ||
56303d34 | 499 | int batadv_algo_register(struct batadv_algo_ops *bat_algo_ops) |
1c280471 | 500 | { |
56303d34 | 501 | struct batadv_algo_ops *bat_algo_ops_tmp; |
5346c35e | 502 | int ret; |
1c280471 | 503 | |
ee11ad61 | 504 | bat_algo_ops_tmp = batadv_algo_get(bat_algo_ops->name); |
1c280471 | 505 | if (bat_algo_ops_tmp) { |
86ceb360 SE |
506 | pr_info("Trying to register already registered routing algorithm: %s\n", |
507 | bat_algo_ops->name); | |
5346c35e | 508 | ret = -EEXIST; |
1c280471 ML |
509 | goto out; |
510 | } | |
511 | ||
01c4224b | 512 | /* all algorithms must implement all ops (for now) */ |
c2aca022 | 513 | if (!bat_algo_ops->bat_iface_enable || |
00a50076 | 514 | !bat_algo_ops->bat_iface_disable || |
c3229398 | 515 | !bat_algo_ops->bat_iface_update_mac || |
cd8b78e7 | 516 | !bat_algo_ops->bat_primary_iface_set || |
01c4224b | 517 | !bat_algo_ops->bat_ogm_schedule || |
a3285a8f | 518 | !bat_algo_ops->bat_ogm_emit || |
c43c981e AQ |
519 | !bat_algo_ops->bat_neigh_cmp || |
520 | !bat_algo_ops->bat_neigh_is_equiv_or_better) { | |
01c4224b ML |
521 | pr_info("Routing algo '%s' does not implement required ops\n", |
522 | bat_algo_ops->name); | |
5346c35e | 523 | ret = -EINVAL; |
01c4224b ML |
524 | goto out; |
525 | } | |
526 | ||
1c280471 | 527 | INIT_HLIST_NODE(&bat_algo_ops->list); |
ee11ad61 | 528 | hlist_add_head(&bat_algo_ops->list, &batadv_algo_list); |
1c280471 ML |
529 | ret = 0; |
530 | ||
531 | out: | |
532 | return ret; | |
533 | } | |
534 | ||
56303d34 | 535 | int batadv_algo_select(struct batadv_priv *bat_priv, char *name) |
1c280471 | 536 | { |
56303d34 | 537 | struct batadv_algo_ops *bat_algo_ops; |
5346c35e | 538 | int ret = -EINVAL; |
1c280471 | 539 | |
ee11ad61 | 540 | bat_algo_ops = batadv_algo_get(name); |
1c280471 ML |
541 | if (!bat_algo_ops) |
542 | goto out; | |
543 | ||
544 | bat_priv->bat_algo_ops = bat_algo_ops; | |
545 | ret = 0; | |
546 | ||
547 | out: | |
548 | return ret; | |
549 | } | |
550 | ||
3193e8fd | 551 | int batadv_algo_seq_print_text(struct seq_file *seq, void *offset) |
1c280471 | 552 | { |
56303d34 | 553 | struct batadv_algo_ops *bat_algo_ops; |
1c280471 | 554 | |
0c814653 | 555 | seq_puts(seq, "Available routing algorithms:\n"); |
1c280471 | 556 | |
b67bfe0d | 557 | hlist_for_each_entry(bat_algo_ops, &batadv_algo_list, list) { |
1c280471 ML |
558 | seq_printf(seq, "%s\n", bat_algo_ops->name); |
559 | } | |
560 | ||
561 | return 0; | |
562 | } | |
563 | ||
95a066d8 SE |
564 | /** |
565 | * batadv_skb_crc32 - calculate CRC32 of the whole packet and skip bytes in | |
566 | * the header | |
567 | * @skb: skb pointing to fragmented socket buffers | |
568 | * @payload_ptr: Pointer to position inside the head buffer of the skb | |
569 | * marking the start of the data to be CRC'ed | |
570 | * | |
571 | * payload_ptr must always point to an address in the skb head buffer and not to | |
572 | * a fragment. | |
573 | */ | |
574 | __be32 batadv_skb_crc32(struct sk_buff *skb, u8 *payload_ptr) | |
575 | { | |
576 | u32 crc = 0; | |
577 | unsigned int from; | |
578 | unsigned int to = skb->len; | |
579 | struct skb_seq_state st; | |
580 | const u8 *data; | |
581 | unsigned int len; | |
582 | unsigned int consumed = 0; | |
583 | ||
584 | from = (unsigned int)(payload_ptr - skb->data); | |
585 | ||
586 | skb_prepare_seq_read(skb, from, to, &st); | |
587 | while ((len = skb_seq_read(consumed, &data, &st)) != 0) { | |
588 | crc = crc32c(crc, data, len); | |
589 | consumed += len; | |
590 | } | |
95a066d8 SE |
591 | |
592 | return htonl(crc); | |
593 | } | |
594 | ||
ef261577 ML |
595 | /** |
596 | * batadv_tvlv_handler_free_ref - decrement the tvlv handler refcounter and | |
597 | * possibly free it | |
598 | * @tvlv_handler: the tvlv handler to free | |
599 | */ | |
600 | static void | |
601 | batadv_tvlv_handler_free_ref(struct batadv_tvlv_handler *tvlv_handler) | |
602 | { | |
603 | if (atomic_dec_and_test(&tvlv_handler->refcount)) | |
604 | kfree_rcu(tvlv_handler, rcu); | |
605 | } | |
606 | ||
607 | /** | |
608 | * batadv_tvlv_handler_get - retrieve tvlv handler from the tvlv handler list | |
609 | * based on the provided type and version (both need to match) | |
610 | * @bat_priv: the bat priv with all the soft interface information | |
611 | * @type: tvlv handler type to look for | |
612 | * @version: tvlv handler version to look for | |
613 | * | |
614 | * Returns tvlv handler if found or NULL otherwise. | |
615 | */ | |
616 | static struct batadv_tvlv_handler | |
617 | *batadv_tvlv_handler_get(struct batadv_priv *bat_priv, | |
618 | uint8_t type, uint8_t version) | |
619 | { | |
620 | struct batadv_tvlv_handler *tvlv_handler_tmp, *tvlv_handler = NULL; | |
621 | ||
622 | rcu_read_lock(); | |
623 | hlist_for_each_entry_rcu(tvlv_handler_tmp, | |
624 | &bat_priv->tvlv.handler_list, list) { | |
625 | if (tvlv_handler_tmp->type != type) | |
626 | continue; | |
627 | ||
628 | if (tvlv_handler_tmp->version != version) | |
629 | continue; | |
630 | ||
631 | if (!atomic_inc_not_zero(&tvlv_handler_tmp->refcount)) | |
632 | continue; | |
633 | ||
634 | tvlv_handler = tvlv_handler_tmp; | |
635 | break; | |
636 | } | |
637 | rcu_read_unlock(); | |
638 | ||
639 | return tvlv_handler; | |
640 | } | |
641 | ||
642 | /** | |
643 | * batadv_tvlv_container_free_ref - decrement the tvlv container refcounter and | |
644 | * possibly free it | |
645 | * @tvlv_handler: the tvlv container to free | |
646 | */ | |
647 | static void batadv_tvlv_container_free_ref(struct batadv_tvlv_container *tvlv) | |
648 | { | |
649 | if (atomic_dec_and_test(&tvlv->refcount)) | |
650 | kfree(tvlv); | |
651 | } | |
652 | ||
653 | /** | |
654 | * batadv_tvlv_container_get - retrieve tvlv container from the tvlv container | |
655 | * list based on the provided type and version (both need to match) | |
656 | * @bat_priv: the bat priv with all the soft interface information | |
657 | * @type: tvlv container type to look for | |
658 | * @version: tvlv container version to look for | |
659 | * | |
660 | * Has to be called with the appropriate locks being acquired | |
661 | * (tvlv.container_list_lock). | |
662 | * | |
663 | * Returns tvlv container if found or NULL otherwise. | |
664 | */ | |
665 | static struct batadv_tvlv_container | |
666 | *batadv_tvlv_container_get(struct batadv_priv *bat_priv, | |
667 | uint8_t type, uint8_t version) | |
668 | { | |
669 | struct batadv_tvlv_container *tvlv_tmp, *tvlv = NULL; | |
670 | ||
671 | hlist_for_each_entry(tvlv_tmp, &bat_priv->tvlv.container_list, list) { | |
672 | if (tvlv_tmp->tvlv_hdr.type != type) | |
673 | continue; | |
674 | ||
675 | if (tvlv_tmp->tvlv_hdr.version != version) | |
676 | continue; | |
677 | ||
678 | if (!atomic_inc_not_zero(&tvlv_tmp->refcount)) | |
679 | continue; | |
680 | ||
681 | tvlv = tvlv_tmp; | |
682 | break; | |
683 | } | |
684 | ||
685 | return tvlv; | |
686 | } | |
687 | ||
688 | /** | |
689 | * batadv_tvlv_container_list_size - calculate the size of the tvlv container | |
690 | * list entries | |
691 | * @bat_priv: the bat priv with all the soft interface information | |
692 | * | |
693 | * Has to be called with the appropriate locks being acquired | |
694 | * (tvlv.container_list_lock). | |
695 | * | |
696 | * Returns size of all currently registered tvlv containers in bytes. | |
697 | */ | |
698 | static uint16_t batadv_tvlv_container_list_size(struct batadv_priv *bat_priv) | |
699 | { | |
700 | struct batadv_tvlv_container *tvlv; | |
701 | uint16_t tvlv_len = 0; | |
702 | ||
703 | hlist_for_each_entry(tvlv, &bat_priv->tvlv.container_list, list) { | |
704 | tvlv_len += sizeof(struct batadv_tvlv_hdr); | |
705 | tvlv_len += ntohs(tvlv->tvlv_hdr.len); | |
706 | } | |
707 | ||
708 | return tvlv_len; | |
709 | } | |
710 | ||
711 | /** | |
712 | * batadv_tvlv_container_remove - remove tvlv container from the tvlv container | |
713 | * list | |
714 | * @tvlv: the to be removed tvlv container | |
715 | * | |
716 | * Has to be called with the appropriate locks being acquired | |
717 | * (tvlv.container_list_lock). | |
718 | */ | |
719 | static void batadv_tvlv_container_remove(struct batadv_tvlv_container *tvlv) | |
720 | { | |
721 | if (!tvlv) | |
722 | return; | |
723 | ||
724 | hlist_del(&tvlv->list); | |
725 | ||
726 | /* first call to decrement the counter, second call to free */ | |
727 | batadv_tvlv_container_free_ref(tvlv); | |
728 | batadv_tvlv_container_free_ref(tvlv); | |
729 | } | |
730 | ||
731 | /** | |
732 | * batadv_tvlv_container_unregister - unregister tvlv container based on the | |
733 | * provided type and version (both need to match) | |
734 | * @bat_priv: the bat priv with all the soft interface information | |
735 | * @type: tvlv container type to unregister | |
736 | * @version: tvlv container type to unregister | |
737 | */ | |
738 | void batadv_tvlv_container_unregister(struct batadv_priv *bat_priv, | |
739 | uint8_t type, uint8_t version) | |
740 | { | |
741 | struct batadv_tvlv_container *tvlv; | |
742 | ||
743 | spin_lock_bh(&bat_priv->tvlv.container_list_lock); | |
744 | tvlv = batadv_tvlv_container_get(bat_priv, type, version); | |
745 | batadv_tvlv_container_remove(tvlv); | |
746 | spin_unlock_bh(&bat_priv->tvlv.container_list_lock); | |
747 | } | |
748 | ||
749 | /** | |
750 | * batadv_tvlv_container_register - register tvlv type, version and content | |
751 | * to be propagated with each (primary interface) OGM | |
752 | * @bat_priv: the bat priv with all the soft interface information | |
753 | * @type: tvlv container type | |
754 | * @version: tvlv container version | |
755 | * @tvlv_value: tvlv container content | |
756 | * @tvlv_value_len: tvlv container content length | |
757 | * | |
758 | * If a container of the same type and version was already registered the new | |
759 | * content is going to replace the old one. | |
760 | */ | |
761 | void batadv_tvlv_container_register(struct batadv_priv *bat_priv, | |
762 | uint8_t type, uint8_t version, | |
763 | void *tvlv_value, uint16_t tvlv_value_len) | |
764 | { | |
765 | struct batadv_tvlv_container *tvlv_old, *tvlv_new; | |
766 | ||
767 | if (!tvlv_value) | |
768 | tvlv_value_len = 0; | |
769 | ||
770 | tvlv_new = kzalloc(sizeof(*tvlv_new) + tvlv_value_len, GFP_ATOMIC); | |
771 | if (!tvlv_new) | |
772 | return; | |
773 | ||
774 | tvlv_new->tvlv_hdr.version = version; | |
775 | tvlv_new->tvlv_hdr.type = type; | |
776 | tvlv_new->tvlv_hdr.len = htons(tvlv_value_len); | |
777 | ||
778 | memcpy(tvlv_new + 1, tvlv_value, ntohs(tvlv_new->tvlv_hdr.len)); | |
779 | INIT_HLIST_NODE(&tvlv_new->list); | |
780 | atomic_set(&tvlv_new->refcount, 1); | |
781 | ||
782 | spin_lock_bh(&bat_priv->tvlv.container_list_lock); | |
783 | tvlv_old = batadv_tvlv_container_get(bat_priv, type, version); | |
784 | batadv_tvlv_container_remove(tvlv_old); | |
785 | hlist_add_head(&tvlv_new->list, &bat_priv->tvlv.container_list); | |
786 | spin_unlock_bh(&bat_priv->tvlv.container_list_lock); | |
787 | } | |
788 | ||
789 | /** | |
790 | * batadv_tvlv_realloc_packet_buff - reallocate packet buffer to accomodate | |
791 | * requested packet size | |
792 | * @packet_buff: packet buffer | |
793 | * @packet_buff_len: packet buffer size | |
794 | * @packet_min_len: requested packet minimum size | |
795 | * @additional_packet_len: requested additional packet size on top of minimum | |
796 | * size | |
797 | * | |
798 | * Returns true of the packet buffer could be changed to the requested size, | |
799 | * false otherwise. | |
800 | */ | |
801 | static bool batadv_tvlv_realloc_packet_buff(unsigned char **packet_buff, | |
802 | int *packet_buff_len, | |
803 | int min_packet_len, | |
804 | int additional_packet_len) | |
805 | { | |
806 | unsigned char *new_buff; | |
807 | ||
808 | new_buff = kmalloc(min_packet_len + additional_packet_len, GFP_ATOMIC); | |
809 | ||
810 | /* keep old buffer if kmalloc should fail */ | |
811 | if (new_buff) { | |
812 | memcpy(new_buff, *packet_buff, min_packet_len); | |
813 | kfree(*packet_buff); | |
814 | *packet_buff = new_buff; | |
815 | *packet_buff_len = min_packet_len + additional_packet_len; | |
816 | return true; | |
817 | } | |
818 | ||
819 | return false; | |
820 | } | |
821 | ||
822 | /** | |
823 | * batadv_tvlv_container_ogm_append - append tvlv container content to given | |
824 | * OGM packet buffer | |
825 | * @bat_priv: the bat priv with all the soft interface information | |
826 | * @packet_buff: ogm packet buffer | |
827 | * @packet_buff_len: ogm packet buffer size including ogm header and tvlv | |
828 | * content | |
829 | * @packet_min_len: ogm header size to be preserved for the OGM itself | |
830 | * | |
831 | * The ogm packet might be enlarged or shrunk depending on the current size | |
832 | * and the size of the to-be-appended tvlv containers. | |
833 | * | |
834 | * Returns size of all appended tvlv containers in bytes. | |
835 | */ | |
836 | uint16_t batadv_tvlv_container_ogm_append(struct batadv_priv *bat_priv, | |
837 | unsigned char **packet_buff, | |
838 | int *packet_buff_len, | |
839 | int packet_min_len) | |
840 | { | |
841 | struct batadv_tvlv_container *tvlv; | |
842 | struct batadv_tvlv_hdr *tvlv_hdr; | |
843 | uint16_t tvlv_value_len; | |
844 | void *tvlv_value; | |
845 | bool ret; | |
846 | ||
847 | spin_lock_bh(&bat_priv->tvlv.container_list_lock); | |
848 | tvlv_value_len = batadv_tvlv_container_list_size(bat_priv); | |
849 | ||
850 | ret = batadv_tvlv_realloc_packet_buff(packet_buff, packet_buff_len, | |
851 | packet_min_len, tvlv_value_len); | |
852 | ||
853 | if (!ret) | |
854 | goto end; | |
855 | ||
856 | if (!tvlv_value_len) | |
857 | goto end; | |
858 | ||
859 | tvlv_value = (*packet_buff) + packet_min_len; | |
860 | ||
861 | hlist_for_each_entry(tvlv, &bat_priv->tvlv.container_list, list) { | |
862 | tvlv_hdr = tvlv_value; | |
863 | tvlv_hdr->type = tvlv->tvlv_hdr.type; | |
864 | tvlv_hdr->version = tvlv->tvlv_hdr.version; | |
865 | tvlv_hdr->len = tvlv->tvlv_hdr.len; | |
866 | tvlv_value = tvlv_hdr + 1; | |
867 | memcpy(tvlv_value, tvlv + 1, ntohs(tvlv->tvlv_hdr.len)); | |
868 | tvlv_value = (uint8_t *)tvlv_value + ntohs(tvlv->tvlv_hdr.len); | |
869 | } | |
870 | ||
871 | end: | |
872 | spin_unlock_bh(&bat_priv->tvlv.container_list_lock); | |
873 | return tvlv_value_len; | |
874 | } | |
875 | ||
876 | /** | |
877 | * batadv_tvlv_call_handler - parse the given tvlv buffer to call the | |
878 | * appropriate handlers | |
879 | * @bat_priv: the bat priv with all the soft interface information | |
880 | * @tvlv_handler: tvlv callback function handling the tvlv content | |
881 | * @ogm_source: flag indicating wether the tvlv is an ogm or a unicast packet | |
882 | * @orig_node: orig node emitting the ogm packet | |
883 | * @src: source mac address of the unicast packet | |
884 | * @dst: destination mac address of the unicast packet | |
885 | * @tvlv_value: tvlv content | |
886 | * @tvlv_value_len: tvlv content length | |
887 | * | |
888 | * Returns success if handler was not found or the return value of the handler | |
889 | * callback. | |
890 | */ | |
891 | static int batadv_tvlv_call_handler(struct batadv_priv *bat_priv, | |
892 | struct batadv_tvlv_handler *tvlv_handler, | |
893 | bool ogm_source, | |
894 | struct batadv_orig_node *orig_node, | |
895 | uint8_t *src, uint8_t *dst, | |
896 | void *tvlv_value, uint16_t tvlv_value_len) | |
897 | { | |
898 | if (!tvlv_handler) | |
899 | return NET_RX_SUCCESS; | |
900 | ||
901 | if (ogm_source) { | |
902 | if (!tvlv_handler->ogm_handler) | |
903 | return NET_RX_SUCCESS; | |
904 | ||
905 | if (!orig_node) | |
906 | return NET_RX_SUCCESS; | |
907 | ||
908 | tvlv_handler->ogm_handler(bat_priv, orig_node, | |
909 | BATADV_NO_FLAGS, | |
910 | tvlv_value, tvlv_value_len); | |
911 | tvlv_handler->flags |= BATADV_TVLV_HANDLER_OGM_CALLED; | |
912 | } else { | |
913 | if (!src) | |
914 | return NET_RX_SUCCESS; | |
915 | ||
916 | if (!dst) | |
917 | return NET_RX_SUCCESS; | |
918 | ||
919 | if (!tvlv_handler->unicast_handler) | |
920 | return NET_RX_SUCCESS; | |
921 | ||
922 | return tvlv_handler->unicast_handler(bat_priv, src, | |
923 | dst, tvlv_value, | |
924 | tvlv_value_len); | |
925 | } | |
926 | ||
927 | return NET_RX_SUCCESS; | |
928 | } | |
929 | ||
930 | /** | |
931 | * batadv_tvlv_containers_process - parse the given tvlv buffer to call the | |
932 | * appropriate handlers | |
933 | * @bat_priv: the bat priv with all the soft interface information | |
934 | * @ogm_source: flag indicating wether the tvlv is an ogm or a unicast packet | |
935 | * @orig_node: orig node emitting the ogm packet | |
936 | * @src: source mac address of the unicast packet | |
937 | * @dst: destination mac address of the unicast packet | |
938 | * @tvlv_value: tvlv content | |
939 | * @tvlv_value_len: tvlv content length | |
940 | * | |
941 | * Returns success when processing an OGM or the return value of all called | |
942 | * handler callbacks. | |
943 | */ | |
944 | int batadv_tvlv_containers_process(struct batadv_priv *bat_priv, | |
945 | bool ogm_source, | |
946 | struct batadv_orig_node *orig_node, | |
947 | uint8_t *src, uint8_t *dst, | |
948 | void *tvlv_value, uint16_t tvlv_value_len) | |
949 | { | |
950 | struct batadv_tvlv_handler *tvlv_handler; | |
951 | struct batadv_tvlv_hdr *tvlv_hdr; | |
952 | uint16_t tvlv_value_cont_len; | |
953 | uint8_t cifnotfound = BATADV_TVLV_HANDLER_OGM_CIFNOTFND; | |
954 | int ret = NET_RX_SUCCESS; | |
955 | ||
956 | while (tvlv_value_len >= sizeof(*tvlv_hdr)) { | |
957 | tvlv_hdr = tvlv_value; | |
958 | tvlv_value_cont_len = ntohs(tvlv_hdr->len); | |
959 | tvlv_value = tvlv_hdr + 1; | |
960 | tvlv_value_len -= sizeof(*tvlv_hdr); | |
961 | ||
962 | if (tvlv_value_cont_len > tvlv_value_len) | |
963 | break; | |
964 | ||
965 | tvlv_handler = batadv_tvlv_handler_get(bat_priv, | |
966 | tvlv_hdr->type, | |
967 | tvlv_hdr->version); | |
968 | ||
969 | ret |= batadv_tvlv_call_handler(bat_priv, tvlv_handler, | |
970 | ogm_source, orig_node, | |
971 | src, dst, tvlv_value, | |
972 | tvlv_value_cont_len); | |
973 | if (tvlv_handler) | |
974 | batadv_tvlv_handler_free_ref(tvlv_handler); | |
975 | tvlv_value = (uint8_t *)tvlv_value + tvlv_value_cont_len; | |
976 | tvlv_value_len -= tvlv_value_cont_len; | |
977 | } | |
978 | ||
979 | if (!ogm_source) | |
980 | return ret; | |
981 | ||
982 | rcu_read_lock(); | |
983 | hlist_for_each_entry_rcu(tvlv_handler, | |
984 | &bat_priv->tvlv.handler_list, list) { | |
985 | if ((tvlv_handler->flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND) && | |
986 | !(tvlv_handler->flags & BATADV_TVLV_HANDLER_OGM_CALLED)) | |
987 | tvlv_handler->ogm_handler(bat_priv, orig_node, | |
988 | cifnotfound, NULL, 0); | |
989 | ||
990 | tvlv_handler->flags &= ~BATADV_TVLV_HANDLER_OGM_CALLED; | |
991 | } | |
992 | rcu_read_unlock(); | |
993 | ||
994 | return NET_RX_SUCCESS; | |
995 | } | |
996 | ||
997 | /** | |
998 | * batadv_tvlv_ogm_receive - process an incoming ogm and call the appropriate | |
999 | * handlers | |
1000 | * @bat_priv: the bat priv with all the soft interface information | |
1001 | * @batadv_ogm_packet: ogm packet containing the tvlv containers | |
1002 | * @orig_node: orig node emitting the ogm packet | |
1003 | */ | |
1004 | void batadv_tvlv_ogm_receive(struct batadv_priv *bat_priv, | |
1005 | struct batadv_ogm_packet *batadv_ogm_packet, | |
1006 | struct batadv_orig_node *orig_node) | |
1007 | { | |
1008 | void *tvlv_value; | |
1009 | uint16_t tvlv_value_len; | |
1010 | ||
1011 | if (!batadv_ogm_packet) | |
1012 | return; | |
1013 | ||
1014 | tvlv_value_len = ntohs(batadv_ogm_packet->tvlv_len); | |
1015 | if (!tvlv_value_len) | |
1016 | return; | |
1017 | ||
1018 | tvlv_value = batadv_ogm_packet + 1; | |
1019 | ||
1020 | batadv_tvlv_containers_process(bat_priv, true, orig_node, NULL, NULL, | |
1021 | tvlv_value, tvlv_value_len); | |
1022 | } | |
1023 | ||
1024 | /** | |
1025 | * batadv_tvlv_handler_register - register tvlv handler based on the provided | |
1026 | * type and version (both need to match) for ogm tvlv payload and/or unicast | |
1027 | * payload | |
1028 | * @bat_priv: the bat priv with all the soft interface information | |
1029 | * @optr: ogm tvlv handler callback function. This function receives the orig | |
1030 | * node, flags and the tvlv content as argument to process. | |
1031 | * @uptr: unicast tvlv handler callback function. This function receives the | |
1032 | * source & destination of the unicast packet as well as the tvlv content | |
1033 | * to process. | |
1034 | * @type: tvlv handler type to be registered | |
1035 | * @version: tvlv handler version to be registered | |
1036 | * @flags: flags to enable or disable TVLV API behavior | |
1037 | */ | |
1038 | void batadv_tvlv_handler_register(struct batadv_priv *bat_priv, | |
1039 | void (*optr)(struct batadv_priv *bat_priv, | |
1040 | struct batadv_orig_node *orig, | |
1041 | uint8_t flags, | |
1042 | void *tvlv_value, | |
1043 | uint16_t tvlv_value_len), | |
1044 | int (*uptr)(struct batadv_priv *bat_priv, | |
1045 | uint8_t *src, uint8_t *dst, | |
1046 | void *tvlv_value, | |
1047 | uint16_t tvlv_value_len), | |
1048 | uint8_t type, uint8_t version, uint8_t flags) | |
1049 | { | |
1050 | struct batadv_tvlv_handler *tvlv_handler; | |
1051 | ||
1052 | tvlv_handler = batadv_tvlv_handler_get(bat_priv, type, version); | |
1053 | if (tvlv_handler) { | |
1054 | batadv_tvlv_handler_free_ref(tvlv_handler); | |
1055 | return; | |
1056 | } | |
1057 | ||
1058 | tvlv_handler = kzalloc(sizeof(*tvlv_handler), GFP_ATOMIC); | |
1059 | if (!tvlv_handler) | |
1060 | return; | |
1061 | ||
1062 | tvlv_handler->ogm_handler = optr; | |
1063 | tvlv_handler->unicast_handler = uptr; | |
1064 | tvlv_handler->type = type; | |
1065 | tvlv_handler->version = version; | |
1066 | tvlv_handler->flags = flags; | |
1067 | atomic_set(&tvlv_handler->refcount, 1); | |
1068 | INIT_HLIST_NODE(&tvlv_handler->list); | |
1069 | ||
1070 | spin_lock_bh(&bat_priv->tvlv.handler_list_lock); | |
1071 | hlist_add_head_rcu(&tvlv_handler->list, &bat_priv->tvlv.handler_list); | |
1072 | spin_unlock_bh(&bat_priv->tvlv.handler_list_lock); | |
1073 | } | |
1074 | ||
1075 | /** | |
1076 | * batadv_tvlv_handler_unregister - unregister tvlv handler based on the | |
1077 | * provided type and version (both need to match) | |
1078 | * @bat_priv: the bat priv with all the soft interface information | |
1079 | * @type: tvlv handler type to be unregistered | |
1080 | * @version: tvlv handler version to be unregistered | |
1081 | */ | |
1082 | void batadv_tvlv_handler_unregister(struct batadv_priv *bat_priv, | |
1083 | uint8_t type, uint8_t version) | |
1084 | { | |
1085 | struct batadv_tvlv_handler *tvlv_handler; | |
1086 | ||
1087 | tvlv_handler = batadv_tvlv_handler_get(bat_priv, type, version); | |
1088 | if (!tvlv_handler) | |
1089 | return; | |
1090 | ||
1091 | batadv_tvlv_handler_free_ref(tvlv_handler); | |
1092 | spin_lock_bh(&bat_priv->tvlv.handler_list_lock); | |
1093 | hlist_del_rcu(&tvlv_handler->list); | |
1094 | spin_unlock_bh(&bat_priv->tvlv.handler_list_lock); | |
1095 | batadv_tvlv_handler_free_ref(tvlv_handler); | |
1096 | } | |
1097 | ||
1098 | /** | |
1099 | * batadv_tvlv_unicast_send - send a unicast packet with tvlv payload to the | |
1100 | * specified host | |
1101 | * @bat_priv: the bat priv with all the soft interface information | |
1102 | * @src: source mac address of the unicast packet | |
1103 | * @dst: destination mac address of the unicast packet | |
1104 | * @type: tvlv type | |
1105 | * @version: tvlv version | |
1106 | * @tvlv_value: tvlv content | |
1107 | * @tvlv_value_len: tvlv content length | |
1108 | */ | |
1109 | void batadv_tvlv_unicast_send(struct batadv_priv *bat_priv, uint8_t *src, | |
1110 | uint8_t *dst, uint8_t type, uint8_t version, | |
1111 | void *tvlv_value, uint16_t tvlv_value_len) | |
1112 | { | |
1113 | struct batadv_unicast_tvlv_packet *unicast_tvlv_packet; | |
1114 | struct batadv_tvlv_hdr *tvlv_hdr; | |
1115 | struct batadv_orig_node *orig_node; | |
1116 | struct sk_buff *skb = NULL; | |
1117 | unsigned char *tvlv_buff; | |
1118 | unsigned int tvlv_len; | |
1119 | ssize_t hdr_len = sizeof(*unicast_tvlv_packet); | |
1120 | bool ret = false; | |
1121 | ||
1122 | orig_node = batadv_orig_hash_find(bat_priv, dst); | |
1123 | if (!orig_node) | |
1124 | goto out; | |
1125 | ||
1126 | tvlv_len = sizeof(*tvlv_hdr) + tvlv_value_len; | |
1127 | ||
1128 | skb = netdev_alloc_skb_ip_align(NULL, ETH_HLEN + hdr_len + tvlv_len); | |
1129 | if (!skb) | |
1130 | goto out; | |
1131 | ||
1132 | skb->priority = TC_PRIO_CONTROL; | |
1133 | skb_reserve(skb, ETH_HLEN); | |
1134 | tvlv_buff = skb_put(skb, sizeof(*unicast_tvlv_packet) + tvlv_len); | |
1135 | unicast_tvlv_packet = (struct batadv_unicast_tvlv_packet *)tvlv_buff; | |
a40d9b07 SW |
1136 | unicast_tvlv_packet->packet_type = BATADV_UNICAST_TVLV; |
1137 | unicast_tvlv_packet->version = BATADV_COMPAT_VERSION; | |
1138 | unicast_tvlv_packet->ttl = BATADV_TTL; | |
ef261577 ML |
1139 | unicast_tvlv_packet->reserved = 0; |
1140 | unicast_tvlv_packet->tvlv_len = htons(tvlv_len); | |
1141 | unicast_tvlv_packet->align = 0; | |
8fdd0153 AQ |
1142 | ether_addr_copy(unicast_tvlv_packet->src, src); |
1143 | ether_addr_copy(unicast_tvlv_packet->dst, dst); | |
ef261577 ML |
1144 | |
1145 | tvlv_buff = (unsigned char *)(unicast_tvlv_packet + 1); | |
1146 | tvlv_hdr = (struct batadv_tvlv_hdr *)tvlv_buff; | |
1147 | tvlv_hdr->version = version; | |
1148 | tvlv_hdr->type = type; | |
1149 | tvlv_hdr->len = htons(tvlv_value_len); | |
1150 | tvlv_buff += sizeof(*tvlv_hdr); | |
1151 | memcpy(tvlv_buff, tvlv_value, tvlv_value_len); | |
1152 | ||
1153 | if (batadv_send_skb_to_orig(skb, orig_node, NULL) != NET_XMIT_DROP) | |
1154 | ret = true; | |
1155 | ||
1156 | out: | |
1157 | if (skb && !ret) | |
1158 | kfree_skb(skb); | |
1159 | if (orig_node) | |
1160 | batadv_orig_node_free_ref(orig_node); | |
1161 | } | |
1162 | ||
c018ad3d AQ |
1163 | /** |
1164 | * batadv_get_vid - extract the VLAN identifier from skb if any | |
1165 | * @skb: the buffer containing the packet | |
1166 | * @header_len: length of the batman header preceding the ethernet header | |
1167 | * | |
1168 | * If the packet embedded in the skb is vlan tagged this function returns the | |
1169 | * VID with the BATADV_VLAN_HAS_TAG flag. Otherwise BATADV_NO_FLAGS is returned. | |
1170 | */ | |
1171 | unsigned short batadv_get_vid(struct sk_buff *skb, size_t header_len) | |
1172 | { | |
1173 | struct ethhdr *ethhdr = (struct ethhdr *)(skb->data + header_len); | |
1174 | struct vlan_ethhdr *vhdr; | |
1175 | unsigned short vid; | |
1176 | ||
1177 | if (ethhdr->h_proto != htons(ETH_P_8021Q)) | |
1178 | return BATADV_NO_FLAGS; | |
1179 | ||
1180 | if (!pskb_may_pull(skb, header_len + VLAN_ETH_HLEN)) | |
1181 | return BATADV_NO_FLAGS; | |
1182 | ||
1183 | vhdr = (struct vlan_ethhdr *)(skb->data + header_len); | |
1184 | vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK; | |
1185 | vid |= BATADV_VLAN_HAS_TAG; | |
1186 | ||
1187 | return vid; | |
1188 | } | |
1189 | ||
eceb22ae AQ |
1190 | /** |
1191 | * batadv_vlan_ap_isola_get - return the AP isolation status for the given vlan | |
1192 | * @bat_priv: the bat priv with all the soft interface information | |
1193 | * @vid: the VLAN identifier for which the AP isolation attributed as to be | |
1194 | * looked up | |
1195 | * | |
1196 | * Returns true if AP isolation is on for the VLAN idenfied by vid, false | |
1197 | * otherwise | |
1198 | */ | |
1199 | bool batadv_vlan_ap_isola_get(struct batadv_priv *bat_priv, unsigned short vid) | |
1200 | { | |
1201 | bool ap_isolation_enabled = false; | |
1202 | struct batadv_softif_vlan *vlan; | |
1203 | ||
1204 | /* if the AP isolation is requested on a VLAN, then check for its | |
1205 | * setting in the proper VLAN private data structure | |
1206 | */ | |
1207 | vlan = batadv_softif_vlan_get(bat_priv, vid); | |
1208 | if (vlan) { | |
1209 | ap_isolation_enabled = atomic_read(&vlan->ap_isolation); | |
1210 | batadv_softif_vlan_free_ref(vlan); | |
1211 | } | |
1212 | ||
1213 | return ap_isolation_enabled; | |
1214 | } | |
1215 | ||
ee11ad61 | 1216 | static int batadv_param_set_ra(const char *val, const struct kernel_param *kp) |
d419be1f | 1217 | { |
56303d34 | 1218 | struct batadv_algo_ops *bat_algo_ops; |
d8cb5486 ML |
1219 | char *algo_name = (char *)val; |
1220 | size_t name_len = strlen(algo_name); | |
d419be1f | 1221 | |
293c9c1c | 1222 | if (name_len > 0 && algo_name[name_len - 1] == '\n') |
d8cb5486 ML |
1223 | algo_name[name_len - 1] = '\0'; |
1224 | ||
ee11ad61 | 1225 | bat_algo_ops = batadv_algo_get(algo_name); |
d419be1f | 1226 | if (!bat_algo_ops) { |
d8cb5486 | 1227 | pr_err("Routing algorithm '%s' is not supported\n", algo_name); |
d419be1f ML |
1228 | return -EINVAL; |
1229 | } | |
1230 | ||
d8cb5486 | 1231 | return param_set_copystring(algo_name, kp); |
d419be1f ML |
1232 | } |
1233 | ||
ee11ad61 SE |
1234 | static const struct kernel_param_ops batadv_param_ops_ra = { |
1235 | .set = batadv_param_set_ra, | |
d419be1f ML |
1236 | .get = param_get_string, |
1237 | }; | |
1238 | ||
ee11ad61 | 1239 | static struct kparam_string batadv_param_string_ra = { |
3193e8fd SE |
1240 | .maxlen = sizeof(batadv_routing_algo), |
1241 | .string = batadv_routing_algo, | |
d419be1f ML |
1242 | }; |
1243 | ||
ee11ad61 SE |
1244 | module_param_cb(routing_algo, &batadv_param_ops_ra, &batadv_param_string_ra, |
1245 | 0644); | |
1246 | module_init(batadv_init); | |
1247 | module_exit(batadv_exit); | |
c6c8fea2 SE |
1248 | |
1249 | MODULE_LICENSE("GPL"); | |
1250 | ||
42d0b044 SE |
1251 | MODULE_AUTHOR(BATADV_DRIVER_AUTHOR); |
1252 | MODULE_DESCRIPTION(BATADV_DRIVER_DESC); | |
1253 | MODULE_SUPPORTED_DEVICE(BATADV_DRIVER_DEVICE); | |
1254 | MODULE_VERSION(BATADV_SOURCE_VERSION); |