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