Commit | Line | Data |
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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); |
ab49886e LL |
114 | #ifdef CONFIG_BATMAN_ADV_MCAST |
115 | spin_lock_init(&bat_priv->mcast.want_lists_lock); | |
116 | #endif | |
ef261577 ML |
117 | spin_lock_init(&bat_priv->tvlv.container_list_lock); |
118 | spin_lock_init(&bat_priv->tvlv.handler_list_lock); | |
5d2c05b2 | 119 | spin_lock_init(&bat_priv->softif_vlan_list_lock); |
c6c8fea2 SE |
120 | |
121 | INIT_HLIST_HEAD(&bat_priv->forw_bat_list); | |
122 | INIT_HLIST_HEAD(&bat_priv->forw_bcast_list); | |
807736f6 | 123 | INIT_HLIST_HEAD(&bat_priv->gw.list); |
ab49886e LL |
124 | #ifdef CONFIG_BATMAN_ADV_MCAST |
125 | INIT_HLIST_HEAD(&bat_priv->mcast.want_all_unsnoopables_list); | |
126 | #endif | |
807736f6 SE |
127 | INIT_LIST_HEAD(&bat_priv->tt.changes_list); |
128 | INIT_LIST_HEAD(&bat_priv->tt.req_list); | |
129 | INIT_LIST_HEAD(&bat_priv->tt.roam_list); | |
c5caf4ef LL |
130 | #ifdef CONFIG_BATMAN_ADV_MCAST |
131 | INIT_HLIST_HEAD(&bat_priv->mcast.mla_list); | |
132 | #endif | |
ef261577 ML |
133 | INIT_HLIST_HEAD(&bat_priv->tvlv.container_list); |
134 | INIT_HLIST_HEAD(&bat_priv->tvlv.handler_list); | |
5d2c05b2 | 135 | INIT_HLIST_HEAD(&bat_priv->softif_vlan_list); |
c6c8fea2 | 136 | |
7d211efc | 137 | ret = batadv_originator_init(bat_priv); |
5346c35e | 138 | if (ret < 0) |
c6c8fea2 SE |
139 | goto err; |
140 | ||
08c36d3e | 141 | ret = batadv_tt_init(bat_priv); |
5346c35e | 142 | if (ret < 0) |
c6c8fea2 SE |
143 | goto err; |
144 | ||
08adf151 | 145 | ret = batadv_bla_init(bat_priv); |
5346c35e | 146 | if (ret < 0) |
23721387 SW |
147 | goto err; |
148 | ||
2f1dfbe1 AQ |
149 | ret = batadv_dat_init(bat_priv); |
150 | if (ret < 0) | |
151 | goto err; | |
152 | ||
6c519bad | 153 | ret = batadv_nc_mesh_init(bat_priv); |
d353d8d4 MH |
154 | if (ret < 0) |
155 | goto err; | |
156 | ||
414254e3 | 157 | batadv_gw_init(bat_priv); |
60432d75 | 158 | batadv_mcast_init(bat_priv); |
414254e3 | 159 | |
807736f6 | 160 | atomic_set(&bat_priv->gw.reselect, 0); |
39c75a51 | 161 | atomic_set(&bat_priv->mesh_state, BATADV_MESH_ACTIVE); |
5346c35e SE |
162 | |
163 | return 0; | |
c6c8fea2 SE |
164 | |
165 | err: | |
3193e8fd | 166 | batadv_mesh_free(soft_iface); |
5346c35e | 167 | return ret; |
c6c8fea2 SE |
168 | } |
169 | ||
3193e8fd | 170 | void batadv_mesh_free(struct net_device *soft_iface) |
c6c8fea2 | 171 | { |
56303d34 | 172 | struct batadv_priv *bat_priv = netdev_priv(soft_iface); |
c6c8fea2 | 173 | |
39c75a51 | 174 | atomic_set(&bat_priv->mesh_state, BATADV_MESH_DEACTIVATING); |
c6c8fea2 | 175 | |
9455e34c | 176 | batadv_purge_outstanding_packets(bat_priv, NULL); |
c6c8fea2 | 177 | |
7cf06bc6 | 178 | batadv_gw_node_purge(bat_priv); |
6c519bad | 179 | batadv_nc_mesh_free(bat_priv); |
a4361860 AQ |
180 | batadv_dat_free(bat_priv); |
181 | batadv_bla_free(bat_priv); | |
c6c8fea2 | 182 | |
c5caf4ef LL |
183 | batadv_mcast_free(bat_priv); |
184 | ||
a4361860 AQ |
185 | /* Free the TT and the originator tables only after having terminated |
186 | * all the other depending components which may use these structures for | |
187 | * their purposes. | |
188 | */ | |
08c36d3e | 189 | batadv_tt_free(bat_priv); |
c6c8fea2 | 190 | |
a4361860 AQ |
191 | /* Since the originator table clean up routine is accessing the TT |
192 | * tables as well, it has to be invoked after the TT tables have been | |
193 | * freed and marked as empty. This ensures that no cleanup RCU callbacks | |
194 | * accessing the TT data are scheduled for later execution. | |
195 | */ | |
196 | batadv_originator_free(bat_priv); | |
2f1dfbe1 | 197 | |
414254e3 ML |
198 | batadv_gw_free(bat_priv); |
199 | ||
f8214865 | 200 | free_percpu(bat_priv->bat_counters); |
f69ae770 | 201 | bat_priv->bat_counters = NULL; |
f8214865 | 202 | |
39c75a51 | 203 | atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE); |
c6c8fea2 SE |
204 | } |
205 | ||
6e0895c2 DM |
206 | /** |
207 | * batadv_is_my_mac - check if the given mac address belongs to any of the real | |
208 | * interfaces in the current mesh | |
209 | * @bat_priv: the bat priv with all the soft interface information | |
210 | * @addr: the address to check | |
211 | */ | |
fe8a93b9 | 212 | int batadv_is_my_mac(struct batadv_priv *bat_priv, const uint8_t *addr) |
c6c8fea2 | 213 | { |
56303d34 | 214 | const struct batadv_hard_iface *hard_iface; |
c6c8fea2 SE |
215 | |
216 | rcu_read_lock(); | |
3193e8fd | 217 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e9a4f295 | 218 | if (hard_iface->if_status != BATADV_IF_ACTIVE) |
c6c8fea2 SE |
219 | continue; |
220 | ||
fe8a93b9 AQ |
221 | if (hard_iface->soft_iface != bat_priv->soft_iface) |
222 | continue; | |
223 | ||
1eda58bf | 224 | if (batadv_compare_eth(hard_iface->net_dev->dev_addr, addr)) { |
c6c8fea2 SE |
225 | rcu_read_unlock(); |
226 | return 1; | |
227 | } | |
228 | } | |
229 | rcu_read_unlock(); | |
230 | return 0; | |
c6c8fea2 SE |
231 | } |
232 | ||
30da63a6 ML |
233 | /** |
234 | * batadv_seq_print_text_primary_if_get - called from debugfs table printing | |
235 | * function that requires the primary interface | |
236 | * @seq: debugfs table seq_file struct | |
237 | * | |
238 | * Returns primary interface if found or NULL otherwise. | |
239 | */ | |
240 | struct batadv_hard_iface * | |
241 | batadv_seq_print_text_primary_if_get(struct seq_file *seq) | |
242 | { | |
243 | struct net_device *net_dev = (struct net_device *)seq->private; | |
244 | struct batadv_priv *bat_priv = netdev_priv(net_dev); | |
245 | struct batadv_hard_iface *primary_if; | |
246 | ||
247 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
248 | ||
249 | if (!primary_if) { | |
250 | seq_printf(seq, | |
251 | "BATMAN mesh %s disabled - please specify interfaces to enable it\n", | |
252 | net_dev->name); | |
253 | goto out; | |
254 | } | |
255 | ||
256 | if (primary_if->if_status == BATADV_IF_ACTIVE) | |
257 | goto out; | |
258 | ||
259 | seq_printf(seq, | |
260 | "BATMAN mesh %s disabled - primary interface not active\n", | |
261 | net_dev->name); | |
262 | batadv_hardif_free_ref(primary_if); | |
263 | primary_if = NULL; | |
264 | ||
265 | out: | |
266 | return primary_if; | |
267 | } | |
268 | ||
411d6ed9 ML |
269 | /** |
270 | * batadv_max_header_len - calculate maximum encapsulation overhead for a | |
271 | * payload packet | |
272 | * | |
273 | * Return the maximum encapsulation overhead in bytes. | |
274 | */ | |
275 | int batadv_max_header_len(void) | |
276 | { | |
277 | int header_len = 0; | |
278 | ||
279 | header_len = max_t(int, header_len, | |
280 | sizeof(struct batadv_unicast_packet)); | |
281 | header_len = max_t(int, header_len, | |
282 | sizeof(struct batadv_unicast_4addr_packet)); | |
283 | header_len = max_t(int, header_len, | |
284 | sizeof(struct batadv_bcast_packet)); | |
285 | ||
286 | #ifdef CONFIG_BATMAN_ADV_NC | |
287 | header_len = max_t(int, header_len, | |
288 | sizeof(struct batadv_coded_packet)); | |
289 | #endif | |
290 | ||
1df0cbd5 | 291 | return header_len + ETH_HLEN; |
411d6ed9 ML |
292 | } |
293 | ||
c54f38c9 SW |
294 | /** |
295 | * batadv_skb_set_priority - sets skb priority according to packet content | |
296 | * @skb: the packet to be sent | |
297 | * @offset: offset to the packet content | |
298 | * | |
299 | * This function sets a value between 256 and 263 (802.1d priority), which | |
300 | * can be interpreted by the cfg80211 or other drivers. | |
301 | */ | |
302 | void batadv_skb_set_priority(struct sk_buff *skb, int offset) | |
303 | { | |
304 | struct iphdr ip_hdr_tmp, *ip_hdr; | |
305 | struct ipv6hdr ip6_hdr_tmp, *ip6_hdr; | |
306 | struct ethhdr ethhdr_tmp, *ethhdr; | |
307 | struct vlan_ethhdr *vhdr, vhdr_tmp; | |
308 | u32 prio; | |
309 | ||
310 | /* already set, do nothing */ | |
311 | if (skb->priority >= 256 && skb->priority <= 263) | |
312 | return; | |
313 | ||
314 | ethhdr = skb_header_pointer(skb, offset, sizeof(*ethhdr), ðhdr_tmp); | |
315 | if (!ethhdr) | |
316 | return; | |
317 | ||
318 | switch (ethhdr->h_proto) { | |
319 | case htons(ETH_P_8021Q): | |
320 | vhdr = skb_header_pointer(skb, offset + sizeof(*vhdr), | |
321 | sizeof(*vhdr), &vhdr_tmp); | |
322 | if (!vhdr) | |
323 | return; | |
324 | prio = ntohs(vhdr->h_vlan_TCI) & VLAN_PRIO_MASK; | |
325 | prio = prio >> VLAN_PRIO_SHIFT; | |
326 | break; | |
327 | case htons(ETH_P_IP): | |
328 | ip_hdr = skb_header_pointer(skb, offset + sizeof(*ethhdr), | |
329 | sizeof(*ip_hdr), &ip_hdr_tmp); | |
330 | if (!ip_hdr) | |
331 | return; | |
332 | prio = (ipv4_get_dsfield(ip_hdr) & 0xfc) >> 5; | |
333 | break; | |
334 | case htons(ETH_P_IPV6): | |
335 | ip6_hdr = skb_header_pointer(skb, offset + sizeof(*ethhdr), | |
336 | sizeof(*ip6_hdr), &ip6_hdr_tmp); | |
337 | if (!ip6_hdr) | |
338 | return; | |
339 | prio = (ipv6_get_dsfield(ip6_hdr) & 0xfc) >> 5; | |
340 | break; | |
341 | default: | |
342 | return; | |
343 | } | |
344 | ||
345 | skb->priority = prio + 256; | |
346 | } | |
347 | ||
ee11ad61 | 348 | static int batadv_recv_unhandled_packet(struct sk_buff *skb, |
56303d34 | 349 | struct batadv_hard_iface *recv_if) |
ffa995e0 ML |
350 | { |
351 | return NET_RX_DROP; | |
352 | } | |
353 | ||
354 | /* incoming packets with the batman ethertype received on any active hard | |
355 | * interface | |
356 | */ | |
3193e8fd SE |
357 | int batadv_batman_skb_recv(struct sk_buff *skb, struct net_device *dev, |
358 | struct packet_type *ptype, | |
359 | struct net_device *orig_dev) | |
ffa995e0 | 360 | { |
56303d34 | 361 | struct batadv_priv *bat_priv; |
96412690 | 362 | struct batadv_ogm_packet *batadv_ogm_packet; |
56303d34 | 363 | struct batadv_hard_iface *hard_iface; |
ffa995e0 ML |
364 | uint8_t idx; |
365 | int ret; | |
366 | ||
56303d34 SE |
367 | hard_iface = container_of(ptype, struct batadv_hard_iface, |
368 | batman_adv_ptype); | |
ffa995e0 ML |
369 | skb = skb_share_check(skb, GFP_ATOMIC); |
370 | ||
371 | /* skb was released by skb_share_check() */ | |
372 | if (!skb) | |
373 | goto err_out; | |
374 | ||
375 | /* packet should hold at least type and version */ | |
376 | if (unlikely(!pskb_may_pull(skb, 2))) | |
377 | goto err_free; | |
378 | ||
379 | /* expect a valid ethernet header here. */ | |
380 | if (unlikely(skb->mac_len != ETH_HLEN || !skb_mac_header(skb))) | |
381 | goto err_free; | |
382 | ||
383 | if (!hard_iface->soft_iface) | |
384 | goto err_free; | |
385 | ||
386 | bat_priv = netdev_priv(hard_iface->soft_iface); | |
387 | ||
39c75a51 | 388 | if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) |
ffa995e0 ML |
389 | goto err_free; |
390 | ||
391 | /* discard frames on not active interfaces */ | |
e9a4f295 | 392 | if (hard_iface->if_status != BATADV_IF_ACTIVE) |
ffa995e0 ML |
393 | goto err_free; |
394 | ||
96412690 | 395 | batadv_ogm_packet = (struct batadv_ogm_packet *)skb->data; |
ffa995e0 | 396 | |
a40d9b07 | 397 | if (batadv_ogm_packet->version != BATADV_COMPAT_VERSION) { |
39c75a51 | 398 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 399 | "Drop packet: incompatible batman version (%i)\n", |
a40d9b07 | 400 | batadv_ogm_packet->version); |
ffa995e0 ML |
401 | goto err_free; |
402 | } | |
403 | ||
404 | /* all receive handlers return whether they received or reused | |
405 | * the supplied skb. if not, we have to free the skb. | |
406 | */ | |
a40d9b07 | 407 | idx = batadv_ogm_packet->packet_type; |
ee11ad61 | 408 | ret = (*batadv_rx_handler[idx])(skb, hard_iface); |
ffa995e0 ML |
409 | |
410 | if (ret == NET_RX_DROP) | |
411 | kfree_skb(skb); | |
412 | ||
413 | /* return NET_RX_SUCCESS in any case as we | |
414 | * most probably dropped the packet for | |
415 | * routing-logical reasons. | |
416 | */ | |
417 | return NET_RX_SUCCESS; | |
418 | ||
419 | err_free: | |
420 | kfree_skb(skb); | |
421 | err_out: | |
422 | return NET_RX_DROP; | |
423 | } | |
424 | ||
ee11ad61 | 425 | static void batadv_recv_handler_init(void) |
ffa995e0 ML |
426 | { |
427 | int i; | |
428 | ||
ee11ad61 SE |
429 | for (i = 0; i < ARRAY_SIZE(batadv_rx_handler); i++) |
430 | batadv_rx_handler[i] = batadv_recv_unhandled_packet; | |
ffa995e0 | 431 | |
a1f1ac5c SW |
432 | for (i = BATADV_UNICAST_MIN; i <= BATADV_UNICAST_MAX; i++) |
433 | batadv_rx_handler[i] = batadv_recv_unhandled_unicast_packet; | |
434 | ||
031ace8d SW |
435 | /* compile time checks for sizes */ |
436 | BUILD_BUG_ON(sizeof(struct batadv_bla_claim_dst) != 6); | |
437 | BUILD_BUG_ON(sizeof(struct batadv_ogm_packet) != 24); | |
438 | BUILD_BUG_ON(sizeof(struct batadv_icmp_header) != 20); | |
439 | BUILD_BUG_ON(sizeof(struct batadv_icmp_packet) != 20); | |
440 | BUILD_BUG_ON(sizeof(struct batadv_icmp_packet_rr) != 116); | |
441 | BUILD_BUG_ON(sizeof(struct batadv_unicast_packet) != 10); | |
442 | BUILD_BUG_ON(sizeof(struct batadv_unicast_4addr_packet) != 18); | |
443 | BUILD_BUG_ON(sizeof(struct batadv_frag_packet) != 20); | |
444 | BUILD_BUG_ON(sizeof(struct batadv_bcast_packet) != 14); | |
445 | BUILD_BUG_ON(sizeof(struct batadv_coded_packet) != 46); | |
446 | BUILD_BUG_ON(sizeof(struct batadv_unicast_tvlv_packet) != 20); | |
447 | BUILD_BUG_ON(sizeof(struct batadv_tvlv_hdr) != 4); | |
448 | BUILD_BUG_ON(sizeof(struct batadv_tvlv_gateway_data) != 8); | |
449 | BUILD_BUG_ON(sizeof(struct batadv_tvlv_tt_vlan_data) != 8); | |
450 | BUILD_BUG_ON(sizeof(struct batadv_tvlv_tt_change) != 12); | |
451 | BUILD_BUG_ON(sizeof(struct batadv_tvlv_roam_adv) != 8); | |
80067c83 | 452 | |
a1f1ac5c SW |
453 | /* broadcast packet */ |
454 | batadv_rx_handler[BATADV_BCAST] = batadv_recv_bcast_packet; | |
455 | ||
456 | /* unicast packets ... */ | |
7cdcf6dd AQ |
457 | /* unicast with 4 addresses packet */ |
458 | batadv_rx_handler[BATADV_UNICAST_4ADDR] = batadv_recv_unicast_packet; | |
ffa995e0 | 459 | /* unicast packet */ |
acd34afa | 460 | batadv_rx_handler[BATADV_UNICAST] = batadv_recv_unicast_packet; |
ef261577 ML |
461 | /* unicast tvlv packet */ |
462 | batadv_rx_handler[BATADV_UNICAST_TVLV] = batadv_recv_unicast_tvlv; | |
a1f1ac5c SW |
463 | /* batman icmp packet */ |
464 | batadv_rx_handler[BATADV_ICMP] = batadv_recv_icmp_packet; | |
610bfc6b MH |
465 | /* Fragmented packets */ |
466 | batadv_rx_handler[BATADV_UNICAST_FRAG] = batadv_recv_frag_packet; | |
ffa995e0 ML |
467 | } |
468 | ||
56303d34 SE |
469 | int |
470 | batadv_recv_handler_register(uint8_t packet_type, | |
471 | int (*recv_handler)(struct sk_buff *, | |
472 | struct batadv_hard_iface *)) | |
ffa995e0 | 473 | { |
a1f1ac5c SW |
474 | int (*curr)(struct sk_buff *, |
475 | struct batadv_hard_iface *); | |
476 | curr = batadv_rx_handler[packet_type]; | |
477 | ||
478 | if ((curr != batadv_recv_unhandled_packet) && | |
479 | (curr != batadv_recv_unhandled_unicast_packet)) | |
ffa995e0 ML |
480 | return -EBUSY; |
481 | ||
ee11ad61 | 482 | batadv_rx_handler[packet_type] = recv_handler; |
ffa995e0 ML |
483 | return 0; |
484 | } | |
485 | ||
3193e8fd | 486 | void batadv_recv_handler_unregister(uint8_t packet_type) |
ffa995e0 | 487 | { |
ee11ad61 | 488 | batadv_rx_handler[packet_type] = batadv_recv_unhandled_packet; |
ffa995e0 ML |
489 | } |
490 | ||
56303d34 | 491 | static struct batadv_algo_ops *batadv_algo_get(char *name) |
1c280471 | 492 | { |
56303d34 | 493 | struct batadv_algo_ops *bat_algo_ops = NULL, *bat_algo_ops_tmp; |
1c280471 | 494 | |
b67bfe0d | 495 | hlist_for_each_entry(bat_algo_ops_tmp, &batadv_algo_list, list) { |
1c280471 ML |
496 | if (strcmp(bat_algo_ops_tmp->name, name) != 0) |
497 | continue; | |
498 | ||
499 | bat_algo_ops = bat_algo_ops_tmp; | |
500 | break; | |
501 | } | |
502 | ||
503 | return bat_algo_ops; | |
504 | } | |
505 | ||
56303d34 | 506 | int batadv_algo_register(struct batadv_algo_ops *bat_algo_ops) |
1c280471 | 507 | { |
56303d34 | 508 | struct batadv_algo_ops *bat_algo_ops_tmp; |
5346c35e | 509 | int ret; |
1c280471 | 510 | |
ee11ad61 | 511 | bat_algo_ops_tmp = batadv_algo_get(bat_algo_ops->name); |
1c280471 | 512 | if (bat_algo_ops_tmp) { |
86ceb360 SE |
513 | pr_info("Trying to register already registered routing algorithm: %s\n", |
514 | bat_algo_ops->name); | |
5346c35e | 515 | ret = -EEXIST; |
1c280471 ML |
516 | goto out; |
517 | } | |
518 | ||
01c4224b | 519 | /* all algorithms must implement all ops (for now) */ |
c2aca022 | 520 | if (!bat_algo_ops->bat_iface_enable || |
00a50076 | 521 | !bat_algo_ops->bat_iface_disable || |
c3229398 | 522 | !bat_algo_ops->bat_iface_update_mac || |
cd8b78e7 | 523 | !bat_algo_ops->bat_primary_iface_set || |
01c4224b | 524 | !bat_algo_ops->bat_ogm_schedule || |
a3285a8f | 525 | !bat_algo_ops->bat_ogm_emit || |
c43c981e AQ |
526 | !bat_algo_ops->bat_neigh_cmp || |
527 | !bat_algo_ops->bat_neigh_is_equiv_or_better) { | |
01c4224b ML |
528 | pr_info("Routing algo '%s' does not implement required ops\n", |
529 | bat_algo_ops->name); | |
5346c35e | 530 | ret = -EINVAL; |
01c4224b ML |
531 | goto out; |
532 | } | |
533 | ||
1c280471 | 534 | INIT_HLIST_NODE(&bat_algo_ops->list); |
ee11ad61 | 535 | hlist_add_head(&bat_algo_ops->list, &batadv_algo_list); |
1c280471 ML |
536 | ret = 0; |
537 | ||
538 | out: | |
539 | return ret; | |
540 | } | |
541 | ||
56303d34 | 542 | int batadv_algo_select(struct batadv_priv *bat_priv, char *name) |
1c280471 | 543 | { |
56303d34 | 544 | struct batadv_algo_ops *bat_algo_ops; |
5346c35e | 545 | int ret = -EINVAL; |
1c280471 | 546 | |
ee11ad61 | 547 | bat_algo_ops = batadv_algo_get(name); |
1c280471 ML |
548 | if (!bat_algo_ops) |
549 | goto out; | |
550 | ||
551 | bat_priv->bat_algo_ops = bat_algo_ops; | |
552 | ret = 0; | |
553 | ||
554 | out: | |
555 | return ret; | |
556 | } | |
557 | ||
3193e8fd | 558 | int batadv_algo_seq_print_text(struct seq_file *seq, void *offset) |
1c280471 | 559 | { |
56303d34 | 560 | struct batadv_algo_ops *bat_algo_ops; |
1c280471 | 561 | |
0c814653 | 562 | seq_puts(seq, "Available routing algorithms:\n"); |
1c280471 | 563 | |
b67bfe0d | 564 | hlist_for_each_entry(bat_algo_ops, &batadv_algo_list, list) { |
1c280471 ML |
565 | seq_printf(seq, "%s\n", bat_algo_ops->name); |
566 | } | |
567 | ||
568 | return 0; | |
569 | } | |
570 | ||
95a066d8 SE |
571 | /** |
572 | * batadv_skb_crc32 - calculate CRC32 of the whole packet and skip bytes in | |
573 | * the header | |
574 | * @skb: skb pointing to fragmented socket buffers | |
575 | * @payload_ptr: Pointer to position inside the head buffer of the skb | |
576 | * marking the start of the data to be CRC'ed | |
577 | * | |
578 | * payload_ptr must always point to an address in the skb head buffer and not to | |
579 | * a fragment. | |
580 | */ | |
581 | __be32 batadv_skb_crc32(struct sk_buff *skb, u8 *payload_ptr) | |
582 | { | |
583 | u32 crc = 0; | |
584 | unsigned int from; | |
585 | unsigned int to = skb->len; | |
586 | struct skb_seq_state st; | |
587 | const u8 *data; | |
588 | unsigned int len; | |
589 | unsigned int consumed = 0; | |
590 | ||
591 | from = (unsigned int)(payload_ptr - skb->data); | |
592 | ||
593 | skb_prepare_seq_read(skb, from, to, &st); | |
594 | while ((len = skb_seq_read(consumed, &data, &st)) != 0) { | |
595 | crc = crc32c(crc, data, len); | |
596 | consumed += len; | |
597 | } | |
95a066d8 SE |
598 | |
599 | return htonl(crc); | |
600 | } | |
601 | ||
ef261577 ML |
602 | /** |
603 | * batadv_tvlv_handler_free_ref - decrement the tvlv handler refcounter and | |
604 | * possibly free it | |
605 | * @tvlv_handler: the tvlv handler to free | |
606 | */ | |
607 | static void | |
608 | batadv_tvlv_handler_free_ref(struct batadv_tvlv_handler *tvlv_handler) | |
609 | { | |
610 | if (atomic_dec_and_test(&tvlv_handler->refcount)) | |
611 | kfree_rcu(tvlv_handler, rcu); | |
612 | } | |
613 | ||
614 | /** | |
615 | * batadv_tvlv_handler_get - retrieve tvlv handler from the tvlv handler list | |
616 | * based on the provided type and version (both need to match) | |
617 | * @bat_priv: the bat priv with all the soft interface information | |
618 | * @type: tvlv handler type to look for | |
619 | * @version: tvlv handler version to look for | |
620 | * | |
621 | * Returns tvlv handler if found or NULL otherwise. | |
622 | */ | |
623 | static struct batadv_tvlv_handler | |
624 | *batadv_tvlv_handler_get(struct batadv_priv *bat_priv, | |
625 | uint8_t type, uint8_t version) | |
626 | { | |
627 | struct batadv_tvlv_handler *tvlv_handler_tmp, *tvlv_handler = NULL; | |
628 | ||
629 | rcu_read_lock(); | |
630 | hlist_for_each_entry_rcu(tvlv_handler_tmp, | |
631 | &bat_priv->tvlv.handler_list, list) { | |
632 | if (tvlv_handler_tmp->type != type) | |
633 | continue; | |
634 | ||
635 | if (tvlv_handler_tmp->version != version) | |
636 | continue; | |
637 | ||
638 | if (!atomic_inc_not_zero(&tvlv_handler_tmp->refcount)) | |
639 | continue; | |
640 | ||
641 | tvlv_handler = tvlv_handler_tmp; | |
642 | break; | |
643 | } | |
644 | rcu_read_unlock(); | |
645 | ||
646 | return tvlv_handler; | |
647 | } | |
648 | ||
649 | /** | |
650 | * batadv_tvlv_container_free_ref - decrement the tvlv container refcounter and | |
651 | * possibly free it | |
652 | * @tvlv_handler: the tvlv container to free | |
653 | */ | |
654 | static void batadv_tvlv_container_free_ref(struct batadv_tvlv_container *tvlv) | |
655 | { | |
656 | if (atomic_dec_and_test(&tvlv->refcount)) | |
657 | kfree(tvlv); | |
658 | } | |
659 | ||
660 | /** | |
661 | * batadv_tvlv_container_get - retrieve tvlv container from the tvlv container | |
662 | * list based on the provided type and version (both need to match) | |
663 | * @bat_priv: the bat priv with all the soft interface information | |
664 | * @type: tvlv container type to look for | |
665 | * @version: tvlv container version to look for | |
666 | * | |
667 | * Has to be called with the appropriate locks being acquired | |
668 | * (tvlv.container_list_lock). | |
669 | * | |
670 | * Returns tvlv container if found or NULL otherwise. | |
671 | */ | |
672 | static struct batadv_tvlv_container | |
673 | *batadv_tvlv_container_get(struct batadv_priv *bat_priv, | |
674 | uint8_t type, uint8_t version) | |
675 | { | |
676 | struct batadv_tvlv_container *tvlv_tmp, *tvlv = NULL; | |
677 | ||
678 | hlist_for_each_entry(tvlv_tmp, &bat_priv->tvlv.container_list, list) { | |
679 | if (tvlv_tmp->tvlv_hdr.type != type) | |
680 | continue; | |
681 | ||
682 | if (tvlv_tmp->tvlv_hdr.version != version) | |
683 | continue; | |
684 | ||
685 | if (!atomic_inc_not_zero(&tvlv_tmp->refcount)) | |
686 | continue; | |
687 | ||
688 | tvlv = tvlv_tmp; | |
689 | break; | |
690 | } | |
691 | ||
692 | return tvlv; | |
693 | } | |
694 | ||
695 | /** | |
696 | * batadv_tvlv_container_list_size - calculate the size of the tvlv container | |
697 | * list entries | |
698 | * @bat_priv: the bat priv with all the soft interface information | |
699 | * | |
700 | * Has to be called with the appropriate locks being acquired | |
701 | * (tvlv.container_list_lock). | |
702 | * | |
703 | * Returns size of all currently registered tvlv containers in bytes. | |
704 | */ | |
705 | static uint16_t batadv_tvlv_container_list_size(struct batadv_priv *bat_priv) | |
706 | { | |
707 | struct batadv_tvlv_container *tvlv; | |
708 | uint16_t tvlv_len = 0; | |
709 | ||
710 | hlist_for_each_entry(tvlv, &bat_priv->tvlv.container_list, list) { | |
711 | tvlv_len += sizeof(struct batadv_tvlv_hdr); | |
712 | tvlv_len += ntohs(tvlv->tvlv_hdr.len); | |
713 | } | |
714 | ||
715 | return tvlv_len; | |
716 | } | |
717 | ||
718 | /** | |
719 | * batadv_tvlv_container_remove - remove tvlv container from the tvlv container | |
720 | * list | |
721 | * @tvlv: the to be removed tvlv container | |
722 | * | |
723 | * Has to be called with the appropriate locks being acquired | |
724 | * (tvlv.container_list_lock). | |
725 | */ | |
726 | static void batadv_tvlv_container_remove(struct batadv_tvlv_container *tvlv) | |
727 | { | |
728 | if (!tvlv) | |
729 | return; | |
730 | ||
731 | hlist_del(&tvlv->list); | |
732 | ||
733 | /* first call to decrement the counter, second call to free */ | |
734 | batadv_tvlv_container_free_ref(tvlv); | |
735 | batadv_tvlv_container_free_ref(tvlv); | |
736 | } | |
737 | ||
738 | /** | |
739 | * batadv_tvlv_container_unregister - unregister tvlv container based on the | |
740 | * provided type and version (both need to match) | |
741 | * @bat_priv: the bat priv with all the soft interface information | |
742 | * @type: tvlv container type to unregister | |
743 | * @version: tvlv container type to unregister | |
744 | */ | |
745 | void batadv_tvlv_container_unregister(struct batadv_priv *bat_priv, | |
746 | uint8_t type, uint8_t version) | |
747 | { | |
748 | struct batadv_tvlv_container *tvlv; | |
749 | ||
750 | spin_lock_bh(&bat_priv->tvlv.container_list_lock); | |
751 | tvlv = batadv_tvlv_container_get(bat_priv, type, version); | |
752 | batadv_tvlv_container_remove(tvlv); | |
753 | spin_unlock_bh(&bat_priv->tvlv.container_list_lock); | |
754 | } | |
755 | ||
756 | /** | |
757 | * batadv_tvlv_container_register - register tvlv type, version and content | |
758 | * to be propagated with each (primary interface) OGM | |
759 | * @bat_priv: the bat priv with all the soft interface information | |
760 | * @type: tvlv container type | |
761 | * @version: tvlv container version | |
762 | * @tvlv_value: tvlv container content | |
763 | * @tvlv_value_len: tvlv container content length | |
764 | * | |
765 | * If a container of the same type and version was already registered the new | |
766 | * content is going to replace the old one. | |
767 | */ | |
768 | void batadv_tvlv_container_register(struct batadv_priv *bat_priv, | |
769 | uint8_t type, uint8_t version, | |
770 | void *tvlv_value, uint16_t tvlv_value_len) | |
771 | { | |
772 | struct batadv_tvlv_container *tvlv_old, *tvlv_new; | |
773 | ||
774 | if (!tvlv_value) | |
775 | tvlv_value_len = 0; | |
776 | ||
777 | tvlv_new = kzalloc(sizeof(*tvlv_new) + tvlv_value_len, GFP_ATOMIC); | |
778 | if (!tvlv_new) | |
779 | return; | |
780 | ||
781 | tvlv_new->tvlv_hdr.version = version; | |
782 | tvlv_new->tvlv_hdr.type = type; | |
783 | tvlv_new->tvlv_hdr.len = htons(tvlv_value_len); | |
784 | ||
785 | memcpy(tvlv_new + 1, tvlv_value, ntohs(tvlv_new->tvlv_hdr.len)); | |
786 | INIT_HLIST_NODE(&tvlv_new->list); | |
787 | atomic_set(&tvlv_new->refcount, 1); | |
788 | ||
789 | spin_lock_bh(&bat_priv->tvlv.container_list_lock); | |
790 | tvlv_old = batadv_tvlv_container_get(bat_priv, type, version); | |
791 | batadv_tvlv_container_remove(tvlv_old); | |
792 | hlist_add_head(&tvlv_new->list, &bat_priv->tvlv.container_list); | |
793 | spin_unlock_bh(&bat_priv->tvlv.container_list_lock); | |
794 | } | |
795 | ||
796 | /** | |
797 | * batadv_tvlv_realloc_packet_buff - reallocate packet buffer to accomodate | |
798 | * requested packet size | |
799 | * @packet_buff: packet buffer | |
800 | * @packet_buff_len: packet buffer size | |
801 | * @packet_min_len: requested packet minimum size | |
802 | * @additional_packet_len: requested additional packet size on top of minimum | |
803 | * size | |
804 | * | |
805 | * Returns true of the packet buffer could be changed to the requested size, | |
806 | * false otherwise. | |
807 | */ | |
808 | static bool batadv_tvlv_realloc_packet_buff(unsigned char **packet_buff, | |
809 | int *packet_buff_len, | |
810 | int min_packet_len, | |
811 | int additional_packet_len) | |
812 | { | |
813 | unsigned char *new_buff; | |
814 | ||
815 | new_buff = kmalloc(min_packet_len + additional_packet_len, GFP_ATOMIC); | |
816 | ||
817 | /* keep old buffer if kmalloc should fail */ | |
818 | if (new_buff) { | |
819 | memcpy(new_buff, *packet_buff, min_packet_len); | |
820 | kfree(*packet_buff); | |
821 | *packet_buff = new_buff; | |
822 | *packet_buff_len = min_packet_len + additional_packet_len; | |
823 | return true; | |
824 | } | |
825 | ||
826 | return false; | |
827 | } | |
828 | ||
829 | /** | |
830 | * batadv_tvlv_container_ogm_append - append tvlv container content to given | |
831 | * OGM packet buffer | |
832 | * @bat_priv: the bat priv with all the soft interface information | |
833 | * @packet_buff: ogm packet buffer | |
834 | * @packet_buff_len: ogm packet buffer size including ogm header and tvlv | |
835 | * content | |
836 | * @packet_min_len: ogm header size to be preserved for the OGM itself | |
837 | * | |
838 | * The ogm packet might be enlarged or shrunk depending on the current size | |
839 | * and the size of the to-be-appended tvlv containers. | |
840 | * | |
841 | * Returns size of all appended tvlv containers in bytes. | |
842 | */ | |
843 | uint16_t batadv_tvlv_container_ogm_append(struct batadv_priv *bat_priv, | |
844 | unsigned char **packet_buff, | |
845 | int *packet_buff_len, | |
846 | int packet_min_len) | |
847 | { | |
848 | struct batadv_tvlv_container *tvlv; | |
849 | struct batadv_tvlv_hdr *tvlv_hdr; | |
850 | uint16_t tvlv_value_len; | |
851 | void *tvlv_value; | |
852 | bool ret; | |
853 | ||
854 | spin_lock_bh(&bat_priv->tvlv.container_list_lock); | |
855 | tvlv_value_len = batadv_tvlv_container_list_size(bat_priv); | |
856 | ||
857 | ret = batadv_tvlv_realloc_packet_buff(packet_buff, packet_buff_len, | |
858 | packet_min_len, tvlv_value_len); | |
859 | ||
860 | if (!ret) | |
861 | goto end; | |
862 | ||
863 | if (!tvlv_value_len) | |
864 | goto end; | |
865 | ||
866 | tvlv_value = (*packet_buff) + packet_min_len; | |
867 | ||
868 | hlist_for_each_entry(tvlv, &bat_priv->tvlv.container_list, list) { | |
869 | tvlv_hdr = tvlv_value; | |
870 | tvlv_hdr->type = tvlv->tvlv_hdr.type; | |
871 | tvlv_hdr->version = tvlv->tvlv_hdr.version; | |
872 | tvlv_hdr->len = tvlv->tvlv_hdr.len; | |
873 | tvlv_value = tvlv_hdr + 1; | |
874 | memcpy(tvlv_value, tvlv + 1, ntohs(tvlv->tvlv_hdr.len)); | |
875 | tvlv_value = (uint8_t *)tvlv_value + ntohs(tvlv->tvlv_hdr.len); | |
876 | } | |
877 | ||
878 | end: | |
879 | spin_unlock_bh(&bat_priv->tvlv.container_list_lock); | |
880 | return tvlv_value_len; | |
881 | } | |
882 | ||
883 | /** | |
884 | * batadv_tvlv_call_handler - parse the given tvlv buffer to call the | |
885 | * appropriate handlers | |
886 | * @bat_priv: the bat priv with all the soft interface information | |
887 | * @tvlv_handler: tvlv callback function handling the tvlv content | |
888 | * @ogm_source: flag indicating wether the tvlv is an ogm or a unicast packet | |
889 | * @orig_node: orig node emitting the ogm packet | |
890 | * @src: source mac address of the unicast packet | |
891 | * @dst: destination mac address of the unicast packet | |
892 | * @tvlv_value: tvlv content | |
893 | * @tvlv_value_len: tvlv content length | |
894 | * | |
895 | * Returns success if handler was not found or the return value of the handler | |
896 | * callback. | |
897 | */ | |
898 | static int batadv_tvlv_call_handler(struct batadv_priv *bat_priv, | |
899 | struct batadv_tvlv_handler *tvlv_handler, | |
900 | bool ogm_source, | |
901 | struct batadv_orig_node *orig_node, | |
902 | uint8_t *src, uint8_t *dst, | |
903 | void *tvlv_value, uint16_t tvlv_value_len) | |
904 | { | |
905 | if (!tvlv_handler) | |
906 | return NET_RX_SUCCESS; | |
907 | ||
908 | if (ogm_source) { | |
909 | if (!tvlv_handler->ogm_handler) | |
910 | return NET_RX_SUCCESS; | |
911 | ||
912 | if (!orig_node) | |
913 | return NET_RX_SUCCESS; | |
914 | ||
915 | tvlv_handler->ogm_handler(bat_priv, orig_node, | |
916 | BATADV_NO_FLAGS, | |
917 | tvlv_value, tvlv_value_len); | |
918 | tvlv_handler->flags |= BATADV_TVLV_HANDLER_OGM_CALLED; | |
919 | } else { | |
920 | if (!src) | |
921 | return NET_RX_SUCCESS; | |
922 | ||
923 | if (!dst) | |
924 | return NET_RX_SUCCESS; | |
925 | ||
926 | if (!tvlv_handler->unicast_handler) | |
927 | return NET_RX_SUCCESS; | |
928 | ||
929 | return tvlv_handler->unicast_handler(bat_priv, src, | |
930 | dst, tvlv_value, | |
931 | tvlv_value_len); | |
932 | } | |
933 | ||
934 | return NET_RX_SUCCESS; | |
935 | } | |
936 | ||
937 | /** | |
938 | * batadv_tvlv_containers_process - parse the given tvlv buffer to call the | |
939 | * appropriate handlers | |
940 | * @bat_priv: the bat priv with all the soft interface information | |
941 | * @ogm_source: flag indicating wether the tvlv is an ogm or a unicast packet | |
942 | * @orig_node: orig node emitting the ogm packet | |
943 | * @src: source mac address of the unicast packet | |
944 | * @dst: destination mac address of the unicast packet | |
945 | * @tvlv_value: tvlv content | |
946 | * @tvlv_value_len: tvlv content length | |
947 | * | |
948 | * Returns success when processing an OGM or the return value of all called | |
949 | * handler callbacks. | |
950 | */ | |
951 | int batadv_tvlv_containers_process(struct batadv_priv *bat_priv, | |
952 | bool ogm_source, | |
953 | struct batadv_orig_node *orig_node, | |
954 | uint8_t *src, uint8_t *dst, | |
955 | void *tvlv_value, uint16_t tvlv_value_len) | |
956 | { | |
957 | struct batadv_tvlv_handler *tvlv_handler; | |
958 | struct batadv_tvlv_hdr *tvlv_hdr; | |
959 | uint16_t tvlv_value_cont_len; | |
960 | uint8_t cifnotfound = BATADV_TVLV_HANDLER_OGM_CIFNOTFND; | |
961 | int ret = NET_RX_SUCCESS; | |
962 | ||
963 | while (tvlv_value_len >= sizeof(*tvlv_hdr)) { | |
964 | tvlv_hdr = tvlv_value; | |
965 | tvlv_value_cont_len = ntohs(tvlv_hdr->len); | |
966 | tvlv_value = tvlv_hdr + 1; | |
967 | tvlv_value_len -= sizeof(*tvlv_hdr); | |
968 | ||
969 | if (tvlv_value_cont_len > tvlv_value_len) | |
970 | break; | |
971 | ||
972 | tvlv_handler = batadv_tvlv_handler_get(bat_priv, | |
973 | tvlv_hdr->type, | |
974 | tvlv_hdr->version); | |
975 | ||
976 | ret |= batadv_tvlv_call_handler(bat_priv, tvlv_handler, | |
977 | ogm_source, orig_node, | |
978 | src, dst, tvlv_value, | |
979 | tvlv_value_cont_len); | |
980 | if (tvlv_handler) | |
981 | batadv_tvlv_handler_free_ref(tvlv_handler); | |
982 | tvlv_value = (uint8_t *)tvlv_value + tvlv_value_cont_len; | |
983 | tvlv_value_len -= tvlv_value_cont_len; | |
984 | } | |
985 | ||
986 | if (!ogm_source) | |
987 | return ret; | |
988 | ||
989 | rcu_read_lock(); | |
990 | hlist_for_each_entry_rcu(tvlv_handler, | |
991 | &bat_priv->tvlv.handler_list, list) { | |
992 | if ((tvlv_handler->flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND) && | |
993 | !(tvlv_handler->flags & BATADV_TVLV_HANDLER_OGM_CALLED)) | |
994 | tvlv_handler->ogm_handler(bat_priv, orig_node, | |
995 | cifnotfound, NULL, 0); | |
996 | ||
997 | tvlv_handler->flags &= ~BATADV_TVLV_HANDLER_OGM_CALLED; | |
998 | } | |
999 | rcu_read_unlock(); | |
1000 | ||
1001 | return NET_RX_SUCCESS; | |
1002 | } | |
1003 | ||
1004 | /** | |
1005 | * batadv_tvlv_ogm_receive - process an incoming ogm and call the appropriate | |
1006 | * handlers | |
1007 | * @bat_priv: the bat priv with all the soft interface information | |
1008 | * @batadv_ogm_packet: ogm packet containing the tvlv containers | |
1009 | * @orig_node: orig node emitting the ogm packet | |
1010 | */ | |
1011 | void batadv_tvlv_ogm_receive(struct batadv_priv *bat_priv, | |
1012 | struct batadv_ogm_packet *batadv_ogm_packet, | |
1013 | struct batadv_orig_node *orig_node) | |
1014 | { | |
1015 | void *tvlv_value; | |
1016 | uint16_t tvlv_value_len; | |
1017 | ||
1018 | if (!batadv_ogm_packet) | |
1019 | return; | |
1020 | ||
1021 | tvlv_value_len = ntohs(batadv_ogm_packet->tvlv_len); | |
1022 | if (!tvlv_value_len) | |
1023 | return; | |
1024 | ||
1025 | tvlv_value = batadv_ogm_packet + 1; | |
1026 | ||
1027 | batadv_tvlv_containers_process(bat_priv, true, orig_node, NULL, NULL, | |
1028 | tvlv_value, tvlv_value_len); | |
1029 | } | |
1030 | ||
1031 | /** | |
1032 | * batadv_tvlv_handler_register - register tvlv handler based on the provided | |
1033 | * type and version (both need to match) for ogm tvlv payload and/or unicast | |
1034 | * payload | |
1035 | * @bat_priv: the bat priv with all the soft interface information | |
1036 | * @optr: ogm tvlv handler callback function. This function receives the orig | |
1037 | * node, flags and the tvlv content as argument to process. | |
1038 | * @uptr: unicast tvlv handler callback function. This function receives the | |
1039 | * source & destination of the unicast packet as well as the tvlv content | |
1040 | * to process. | |
1041 | * @type: tvlv handler type to be registered | |
1042 | * @version: tvlv handler version to be registered | |
1043 | * @flags: flags to enable or disable TVLV API behavior | |
1044 | */ | |
1045 | void batadv_tvlv_handler_register(struct batadv_priv *bat_priv, | |
1046 | void (*optr)(struct batadv_priv *bat_priv, | |
1047 | struct batadv_orig_node *orig, | |
1048 | uint8_t flags, | |
1049 | void *tvlv_value, | |
1050 | uint16_t tvlv_value_len), | |
1051 | int (*uptr)(struct batadv_priv *bat_priv, | |
1052 | uint8_t *src, uint8_t *dst, | |
1053 | void *tvlv_value, | |
1054 | uint16_t tvlv_value_len), | |
1055 | uint8_t type, uint8_t version, uint8_t flags) | |
1056 | { | |
1057 | struct batadv_tvlv_handler *tvlv_handler; | |
1058 | ||
1059 | tvlv_handler = batadv_tvlv_handler_get(bat_priv, type, version); | |
1060 | if (tvlv_handler) { | |
1061 | batadv_tvlv_handler_free_ref(tvlv_handler); | |
1062 | return; | |
1063 | } | |
1064 | ||
1065 | tvlv_handler = kzalloc(sizeof(*tvlv_handler), GFP_ATOMIC); | |
1066 | if (!tvlv_handler) | |
1067 | return; | |
1068 | ||
1069 | tvlv_handler->ogm_handler = optr; | |
1070 | tvlv_handler->unicast_handler = uptr; | |
1071 | tvlv_handler->type = type; | |
1072 | tvlv_handler->version = version; | |
1073 | tvlv_handler->flags = flags; | |
1074 | atomic_set(&tvlv_handler->refcount, 1); | |
1075 | INIT_HLIST_NODE(&tvlv_handler->list); | |
1076 | ||
1077 | spin_lock_bh(&bat_priv->tvlv.handler_list_lock); | |
1078 | hlist_add_head_rcu(&tvlv_handler->list, &bat_priv->tvlv.handler_list); | |
1079 | spin_unlock_bh(&bat_priv->tvlv.handler_list_lock); | |
1080 | } | |
1081 | ||
1082 | /** | |
1083 | * batadv_tvlv_handler_unregister - unregister tvlv handler based on the | |
1084 | * provided type and version (both need to match) | |
1085 | * @bat_priv: the bat priv with all the soft interface information | |
1086 | * @type: tvlv handler type to be unregistered | |
1087 | * @version: tvlv handler version to be unregistered | |
1088 | */ | |
1089 | void batadv_tvlv_handler_unregister(struct batadv_priv *bat_priv, | |
1090 | uint8_t type, uint8_t version) | |
1091 | { | |
1092 | struct batadv_tvlv_handler *tvlv_handler; | |
1093 | ||
1094 | tvlv_handler = batadv_tvlv_handler_get(bat_priv, type, version); | |
1095 | if (!tvlv_handler) | |
1096 | return; | |
1097 | ||
1098 | batadv_tvlv_handler_free_ref(tvlv_handler); | |
1099 | spin_lock_bh(&bat_priv->tvlv.handler_list_lock); | |
1100 | hlist_del_rcu(&tvlv_handler->list); | |
1101 | spin_unlock_bh(&bat_priv->tvlv.handler_list_lock); | |
1102 | batadv_tvlv_handler_free_ref(tvlv_handler); | |
1103 | } | |
1104 | ||
1105 | /** | |
1106 | * batadv_tvlv_unicast_send - send a unicast packet with tvlv payload to the | |
1107 | * specified host | |
1108 | * @bat_priv: the bat priv with all the soft interface information | |
1109 | * @src: source mac address of the unicast packet | |
1110 | * @dst: destination mac address of the unicast packet | |
1111 | * @type: tvlv type | |
1112 | * @version: tvlv version | |
1113 | * @tvlv_value: tvlv content | |
1114 | * @tvlv_value_len: tvlv content length | |
1115 | */ | |
1116 | void batadv_tvlv_unicast_send(struct batadv_priv *bat_priv, uint8_t *src, | |
1117 | uint8_t *dst, uint8_t type, uint8_t version, | |
1118 | void *tvlv_value, uint16_t tvlv_value_len) | |
1119 | { | |
1120 | struct batadv_unicast_tvlv_packet *unicast_tvlv_packet; | |
1121 | struct batadv_tvlv_hdr *tvlv_hdr; | |
1122 | struct batadv_orig_node *orig_node; | |
1123 | struct sk_buff *skb = NULL; | |
1124 | unsigned char *tvlv_buff; | |
1125 | unsigned int tvlv_len; | |
1126 | ssize_t hdr_len = sizeof(*unicast_tvlv_packet); | |
1127 | bool ret = false; | |
1128 | ||
1129 | orig_node = batadv_orig_hash_find(bat_priv, dst); | |
1130 | if (!orig_node) | |
1131 | goto out; | |
1132 | ||
1133 | tvlv_len = sizeof(*tvlv_hdr) + tvlv_value_len; | |
1134 | ||
1135 | skb = netdev_alloc_skb_ip_align(NULL, ETH_HLEN + hdr_len + tvlv_len); | |
1136 | if (!skb) | |
1137 | goto out; | |
1138 | ||
1139 | skb->priority = TC_PRIO_CONTROL; | |
1140 | skb_reserve(skb, ETH_HLEN); | |
1141 | tvlv_buff = skb_put(skb, sizeof(*unicast_tvlv_packet) + tvlv_len); | |
1142 | unicast_tvlv_packet = (struct batadv_unicast_tvlv_packet *)tvlv_buff; | |
a40d9b07 SW |
1143 | unicast_tvlv_packet->packet_type = BATADV_UNICAST_TVLV; |
1144 | unicast_tvlv_packet->version = BATADV_COMPAT_VERSION; | |
1145 | unicast_tvlv_packet->ttl = BATADV_TTL; | |
ef261577 ML |
1146 | unicast_tvlv_packet->reserved = 0; |
1147 | unicast_tvlv_packet->tvlv_len = htons(tvlv_len); | |
1148 | unicast_tvlv_packet->align = 0; | |
8fdd0153 AQ |
1149 | ether_addr_copy(unicast_tvlv_packet->src, src); |
1150 | ether_addr_copy(unicast_tvlv_packet->dst, dst); | |
ef261577 ML |
1151 | |
1152 | tvlv_buff = (unsigned char *)(unicast_tvlv_packet + 1); | |
1153 | tvlv_hdr = (struct batadv_tvlv_hdr *)tvlv_buff; | |
1154 | tvlv_hdr->version = version; | |
1155 | tvlv_hdr->type = type; | |
1156 | tvlv_hdr->len = htons(tvlv_value_len); | |
1157 | tvlv_buff += sizeof(*tvlv_hdr); | |
1158 | memcpy(tvlv_buff, tvlv_value, tvlv_value_len); | |
1159 | ||
1160 | if (batadv_send_skb_to_orig(skb, orig_node, NULL) != NET_XMIT_DROP) | |
1161 | ret = true; | |
1162 | ||
1163 | out: | |
1164 | if (skb && !ret) | |
1165 | kfree_skb(skb); | |
1166 | if (orig_node) | |
1167 | batadv_orig_node_free_ref(orig_node); | |
1168 | } | |
1169 | ||
c018ad3d AQ |
1170 | /** |
1171 | * batadv_get_vid - extract the VLAN identifier from skb if any | |
1172 | * @skb: the buffer containing the packet | |
1173 | * @header_len: length of the batman header preceding the ethernet header | |
1174 | * | |
1175 | * If the packet embedded in the skb is vlan tagged this function returns the | |
1176 | * VID with the BATADV_VLAN_HAS_TAG flag. Otherwise BATADV_NO_FLAGS is returned. | |
1177 | */ | |
1178 | unsigned short batadv_get_vid(struct sk_buff *skb, size_t header_len) | |
1179 | { | |
1180 | struct ethhdr *ethhdr = (struct ethhdr *)(skb->data + header_len); | |
1181 | struct vlan_ethhdr *vhdr; | |
1182 | unsigned short vid; | |
1183 | ||
1184 | if (ethhdr->h_proto != htons(ETH_P_8021Q)) | |
1185 | return BATADV_NO_FLAGS; | |
1186 | ||
1187 | if (!pskb_may_pull(skb, header_len + VLAN_ETH_HLEN)) | |
1188 | return BATADV_NO_FLAGS; | |
1189 | ||
1190 | vhdr = (struct vlan_ethhdr *)(skb->data + header_len); | |
1191 | vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK; | |
1192 | vid |= BATADV_VLAN_HAS_TAG; | |
1193 | ||
1194 | return vid; | |
1195 | } | |
1196 | ||
eceb22ae AQ |
1197 | /** |
1198 | * batadv_vlan_ap_isola_get - return the AP isolation status for the given vlan | |
1199 | * @bat_priv: the bat priv with all the soft interface information | |
1200 | * @vid: the VLAN identifier for which the AP isolation attributed as to be | |
1201 | * looked up | |
1202 | * | |
1203 | * Returns true if AP isolation is on for the VLAN idenfied by vid, false | |
1204 | * otherwise | |
1205 | */ | |
1206 | bool batadv_vlan_ap_isola_get(struct batadv_priv *bat_priv, unsigned short vid) | |
1207 | { | |
1208 | bool ap_isolation_enabled = false; | |
1209 | struct batadv_softif_vlan *vlan; | |
1210 | ||
1211 | /* if the AP isolation is requested on a VLAN, then check for its | |
1212 | * setting in the proper VLAN private data structure | |
1213 | */ | |
1214 | vlan = batadv_softif_vlan_get(bat_priv, vid); | |
1215 | if (vlan) { | |
1216 | ap_isolation_enabled = atomic_read(&vlan->ap_isolation); | |
1217 | batadv_softif_vlan_free_ref(vlan); | |
1218 | } | |
1219 | ||
1220 | return ap_isolation_enabled; | |
1221 | } | |
1222 | ||
ee11ad61 | 1223 | static int batadv_param_set_ra(const char *val, const struct kernel_param *kp) |
d419be1f | 1224 | { |
56303d34 | 1225 | struct batadv_algo_ops *bat_algo_ops; |
d8cb5486 ML |
1226 | char *algo_name = (char *)val; |
1227 | size_t name_len = strlen(algo_name); | |
d419be1f | 1228 | |
293c9c1c | 1229 | if (name_len > 0 && algo_name[name_len - 1] == '\n') |
d8cb5486 ML |
1230 | algo_name[name_len - 1] = '\0'; |
1231 | ||
ee11ad61 | 1232 | bat_algo_ops = batadv_algo_get(algo_name); |
d419be1f | 1233 | if (!bat_algo_ops) { |
d8cb5486 | 1234 | pr_err("Routing algorithm '%s' is not supported\n", algo_name); |
d419be1f ML |
1235 | return -EINVAL; |
1236 | } | |
1237 | ||
d8cb5486 | 1238 | return param_set_copystring(algo_name, kp); |
d419be1f ML |
1239 | } |
1240 | ||
ee11ad61 SE |
1241 | static const struct kernel_param_ops batadv_param_ops_ra = { |
1242 | .set = batadv_param_set_ra, | |
d419be1f ML |
1243 | .get = param_get_string, |
1244 | }; | |
1245 | ||
ee11ad61 | 1246 | static struct kparam_string batadv_param_string_ra = { |
3193e8fd SE |
1247 | .maxlen = sizeof(batadv_routing_algo), |
1248 | .string = batadv_routing_algo, | |
d419be1f ML |
1249 | }; |
1250 | ||
ee11ad61 SE |
1251 | module_param_cb(routing_algo, &batadv_param_ops_ra, &batadv_param_string_ra, |
1252 | 0644); | |
1253 | module_init(batadv_init); | |
1254 | module_exit(batadv_exit); | |
c6c8fea2 SE |
1255 | |
1256 | MODULE_LICENSE("GPL"); | |
1257 | ||
42d0b044 SE |
1258 | MODULE_AUTHOR(BATADV_DRIVER_AUTHOR); |
1259 | MODULE_DESCRIPTION(BATADV_DRIVER_DESC); | |
1260 | MODULE_SUPPORTED_DEVICE(BATADV_DRIVER_DEVICE); | |
1261 | MODULE_VERSION(BATADV_SOURCE_VERSION); |