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9f6446c7 | 1 | /* Copyright (C) 2007-2015 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 | ||
1e2c2a4f SE |
18 | #include "main.h" |
19 | ||
20 | #include <linux/atomic.h> | |
21 | #include <linux/bug.h> | |
22 | #include <linux/byteorder/generic.h> | |
95a066d8 | 23 | #include <linux/crc32c.h> |
1e2c2a4f SE |
24 | #include <linux/errno.h> |
25 | #include <linux/fs.h> | |
26 | #include <linux/if_ether.h> | |
c54f38c9 | 27 | #include <linux/if_vlan.h> |
1e2c2a4f SE |
28 | #include <linux/init.h> |
29 | #include <linux/ip.h> | |
30 | #include <linux/ipv6.h> | |
31 | #include <linux/kernel.h> | |
32 | #include <linux/list.h> | |
33 | #include <linux/module.h> | |
34 | #include <linux/moduleparam.h> | |
35 | #include <linux/netdevice.h> | |
36 | #include <linux/pkt_sched.h> | |
37 | #include <linux/rculist.h> | |
38 | #include <linux/rcupdate.h> | |
39 | #include <linux/seq_file.h> | |
40 | #include <linux/skbuff.h> | |
41 | #include <linux/slab.h> | |
42 | #include <linux/spinlock.h> | |
43 | #include <linux/stddef.h> | |
44 | #include <linux/string.h> | |
45 | #include <linux/workqueue.h> | |
c54f38c9 | 46 | #include <net/dsfield.h> |
1e2c2a4f SE |
47 | #include <net/rtnetlink.h> |
48 | ||
49 | #include "bat_algo.h" | |
50 | #include "bridge_loop_avoidance.h" | |
b706b13b | 51 | #include "debugfs.h" |
1e2c2a4f SE |
52 | #include "distributed-arp-table.h" |
53 | #include "gateway_client.h" | |
54 | #include "gateway_common.h" | |
55 | #include "hard-interface.h" | |
56 | #include "icmp_socket.h" | |
57 | #include "multicast.h" | |
58 | #include "network-coding.h" | |
59 | #include "originator.h" | |
60 | #include "packet.h" | |
c6c8fea2 SE |
61 | #include "routing.h" |
62 | #include "send.h" | |
c6c8fea2 | 63 | #include "soft-interface.h" |
c6c8fea2 | 64 | #include "translation-table.h" |
c6c8fea2 | 65 | |
c3caf519 | 66 | /* List manipulations on hardif_list have to be rtnl_lock()'ed, |
9cfc7bd6 SE |
67 | * list traversals just rcu-locked |
68 | */ | |
3193e8fd | 69 | struct list_head batadv_hardif_list; |
ee11ad61 | 70 | static int (*batadv_rx_handler[256])(struct sk_buff *, |
56303d34 | 71 | struct batadv_hard_iface *); |
3193e8fd | 72 | char batadv_routing_algo[20] = "BATMAN_IV"; |
ee11ad61 | 73 | static struct hlist_head batadv_algo_list; |
c6c8fea2 | 74 | |
3193e8fd | 75 | unsigned char batadv_broadcast_addr[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; |
c6c8fea2 | 76 | |
3193e8fd | 77 | struct workqueue_struct *batadv_event_workqueue; |
c6c8fea2 | 78 | |
ee11ad61 | 79 | static void batadv_recv_handler_init(void); |
ffa995e0 | 80 | |
ee11ad61 | 81 | static int __init batadv_init(void) |
c6c8fea2 | 82 | { |
3193e8fd | 83 | INIT_LIST_HEAD(&batadv_hardif_list); |
ee11ad61 | 84 | INIT_HLIST_HEAD(&batadv_algo_list); |
1c280471 | 85 | |
ee11ad61 | 86 | batadv_recv_handler_init(); |
ffa995e0 | 87 | |
81c524f7 | 88 | batadv_iv_init(); |
6c519bad | 89 | batadv_nc_init(); |
c6c8fea2 | 90 | |
3193e8fd | 91 | batadv_event_workqueue = create_singlethread_workqueue("bat_events"); |
c6c8fea2 | 92 | |
3193e8fd | 93 | if (!batadv_event_workqueue) |
c6c8fea2 SE |
94 | return -ENOMEM; |
95 | ||
9039dc7e | 96 | batadv_socket_init(); |
40a072d7 | 97 | batadv_debugfs_init(); |
c6c8fea2 | 98 | |
9563877e | 99 | register_netdevice_notifier(&batadv_hard_if_notifier); |
a4ac28c0 | 100 | rtnl_link_register(&batadv_link_ops); |
c6c8fea2 | 101 | |
86ceb360 | 102 | pr_info("B.A.T.M.A.N. advanced %s (compatibility version %i) loaded\n", |
42d0b044 | 103 | BATADV_SOURCE_VERSION, BATADV_COMPAT_VERSION); |
c6c8fea2 SE |
104 | |
105 | return 0; | |
106 | } | |
107 | ||
ee11ad61 | 108 | static void __exit batadv_exit(void) |
c6c8fea2 | 109 | { |
40a072d7 | 110 | batadv_debugfs_destroy(); |
a4ac28c0 | 111 | rtnl_link_unregister(&batadv_link_ops); |
9563877e SE |
112 | unregister_netdevice_notifier(&batadv_hard_if_notifier); |
113 | batadv_hardif_remove_interfaces(); | |
c6c8fea2 | 114 | |
3193e8fd SE |
115 | flush_workqueue(batadv_event_workqueue); |
116 | destroy_workqueue(batadv_event_workqueue); | |
117 | batadv_event_workqueue = NULL; | |
c6c8fea2 SE |
118 | |
119 | rcu_barrier(); | |
120 | } | |
121 | ||
3193e8fd | 122 | int batadv_mesh_init(struct net_device *soft_iface) |
c6c8fea2 | 123 | { |
56303d34 | 124 | struct batadv_priv *bat_priv = netdev_priv(soft_iface); |
5346c35e | 125 | int ret; |
c6c8fea2 | 126 | |
c6c8fea2 SE |
127 | spin_lock_init(&bat_priv->forw_bat_list_lock); |
128 | spin_lock_init(&bat_priv->forw_bcast_list_lock); | |
807736f6 SE |
129 | spin_lock_init(&bat_priv->tt.changes_list_lock); |
130 | spin_lock_init(&bat_priv->tt.req_list_lock); | |
131 | spin_lock_init(&bat_priv->tt.roam_list_lock); | |
132 | spin_lock_init(&bat_priv->tt.last_changeset_lock); | |
a70a9aa9 | 133 | spin_lock_init(&bat_priv->tt.commit_lock); |
807736f6 | 134 | spin_lock_init(&bat_priv->gw.list_lock); |
ab49886e LL |
135 | #ifdef CONFIG_BATMAN_ADV_MCAST |
136 | spin_lock_init(&bat_priv->mcast.want_lists_lock); | |
137 | #endif | |
ef261577 ML |
138 | spin_lock_init(&bat_priv->tvlv.container_list_lock); |
139 | spin_lock_init(&bat_priv->tvlv.handler_list_lock); | |
5d2c05b2 | 140 | spin_lock_init(&bat_priv->softif_vlan_list_lock); |
c6c8fea2 SE |
141 | |
142 | INIT_HLIST_HEAD(&bat_priv->forw_bat_list); | |
143 | INIT_HLIST_HEAD(&bat_priv->forw_bcast_list); | |
807736f6 | 144 | INIT_HLIST_HEAD(&bat_priv->gw.list); |
ab49886e LL |
145 | #ifdef CONFIG_BATMAN_ADV_MCAST |
146 | INIT_HLIST_HEAD(&bat_priv->mcast.want_all_unsnoopables_list); | |
4c8755d6 LL |
147 | INIT_HLIST_HEAD(&bat_priv->mcast.want_all_ipv4_list); |
148 | INIT_HLIST_HEAD(&bat_priv->mcast.want_all_ipv6_list); | |
ab49886e | 149 | #endif |
807736f6 SE |
150 | INIT_LIST_HEAD(&bat_priv->tt.changes_list); |
151 | INIT_LIST_HEAD(&bat_priv->tt.req_list); | |
152 | INIT_LIST_HEAD(&bat_priv->tt.roam_list); | |
c5caf4ef LL |
153 | #ifdef CONFIG_BATMAN_ADV_MCAST |
154 | INIT_HLIST_HEAD(&bat_priv->mcast.mla_list); | |
155 | #endif | |
ef261577 ML |
156 | INIT_HLIST_HEAD(&bat_priv->tvlv.container_list); |
157 | INIT_HLIST_HEAD(&bat_priv->tvlv.handler_list); | |
5d2c05b2 | 158 | INIT_HLIST_HEAD(&bat_priv->softif_vlan_list); |
c6c8fea2 | 159 | |
7d211efc | 160 | ret = batadv_originator_init(bat_priv); |
5346c35e | 161 | if (ret < 0) |
c6c8fea2 SE |
162 | goto err; |
163 | ||
08c36d3e | 164 | ret = batadv_tt_init(bat_priv); |
5346c35e | 165 | if (ret < 0) |
c6c8fea2 SE |
166 | goto err; |
167 | ||
08adf151 | 168 | ret = batadv_bla_init(bat_priv); |
5346c35e | 169 | if (ret < 0) |
23721387 SW |
170 | goto err; |
171 | ||
2f1dfbe1 AQ |
172 | ret = batadv_dat_init(bat_priv); |
173 | if (ret < 0) | |
174 | goto err; | |
175 | ||
6c519bad | 176 | ret = batadv_nc_mesh_init(bat_priv); |
d353d8d4 MH |
177 | if (ret < 0) |
178 | goto err; | |
179 | ||
414254e3 | 180 | batadv_gw_init(bat_priv); |
60432d75 | 181 | batadv_mcast_init(bat_priv); |
414254e3 | 182 | |
807736f6 | 183 | atomic_set(&bat_priv->gw.reselect, 0); |
39c75a51 | 184 | atomic_set(&bat_priv->mesh_state, BATADV_MESH_ACTIVE); |
5346c35e SE |
185 | |
186 | return 0; | |
c6c8fea2 SE |
187 | |
188 | err: | |
3193e8fd | 189 | batadv_mesh_free(soft_iface); |
5346c35e | 190 | return ret; |
c6c8fea2 SE |
191 | } |
192 | ||
3193e8fd | 193 | void batadv_mesh_free(struct net_device *soft_iface) |
c6c8fea2 | 194 | { |
56303d34 | 195 | struct batadv_priv *bat_priv = netdev_priv(soft_iface); |
c6c8fea2 | 196 | |
39c75a51 | 197 | atomic_set(&bat_priv->mesh_state, BATADV_MESH_DEACTIVATING); |
c6c8fea2 | 198 | |
9455e34c | 199 | batadv_purge_outstanding_packets(bat_priv, NULL); |
c6c8fea2 | 200 | |
7cf06bc6 | 201 | batadv_gw_node_purge(bat_priv); |
6c519bad | 202 | batadv_nc_mesh_free(bat_priv); |
a4361860 AQ |
203 | batadv_dat_free(bat_priv); |
204 | batadv_bla_free(bat_priv); | |
c6c8fea2 | 205 | |
c5caf4ef LL |
206 | batadv_mcast_free(bat_priv); |
207 | ||
a4361860 AQ |
208 | /* Free the TT and the originator tables only after having terminated |
209 | * all the other depending components which may use these structures for | |
210 | * their purposes. | |
211 | */ | |
08c36d3e | 212 | batadv_tt_free(bat_priv); |
c6c8fea2 | 213 | |
a4361860 AQ |
214 | /* Since the originator table clean up routine is accessing the TT |
215 | * tables as well, it has to be invoked after the TT tables have been | |
216 | * freed and marked as empty. This ensures that no cleanup RCU callbacks | |
217 | * accessing the TT data are scheduled for later execution. | |
218 | */ | |
219 | batadv_originator_free(bat_priv); | |
2f1dfbe1 | 220 | |
414254e3 ML |
221 | batadv_gw_free(bat_priv); |
222 | ||
f8214865 | 223 | free_percpu(bat_priv->bat_counters); |
f69ae770 | 224 | bat_priv->bat_counters = NULL; |
f8214865 | 225 | |
39c75a51 | 226 | atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE); |
c6c8fea2 SE |
227 | } |
228 | ||
6e0895c2 DM |
229 | /** |
230 | * batadv_is_my_mac - check if the given mac address belongs to any of the real | |
231 | * interfaces in the current mesh | |
232 | * @bat_priv: the bat priv with all the soft interface information | |
233 | * @addr: the address to check | |
e8ad3b1a MP |
234 | * |
235 | * Returns 'true' if the mac address was found, false otherwise. | |
6e0895c2 | 236 | */ |
e8ad3b1a | 237 | bool batadv_is_my_mac(struct batadv_priv *bat_priv, const uint8_t *addr) |
c6c8fea2 | 238 | { |
56303d34 | 239 | const struct batadv_hard_iface *hard_iface; |
e8ad3b1a | 240 | bool is_my_mac = false; |
c6c8fea2 SE |
241 | |
242 | rcu_read_lock(); | |
3193e8fd | 243 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e9a4f295 | 244 | if (hard_iface->if_status != BATADV_IF_ACTIVE) |
c6c8fea2 SE |
245 | continue; |
246 | ||
fe8a93b9 AQ |
247 | if (hard_iface->soft_iface != bat_priv->soft_iface) |
248 | continue; | |
249 | ||
1eda58bf | 250 | if (batadv_compare_eth(hard_iface->net_dev->dev_addr, addr)) { |
e8ad3b1a MP |
251 | is_my_mac = true; |
252 | break; | |
c6c8fea2 SE |
253 | } |
254 | } | |
255 | rcu_read_unlock(); | |
e8ad3b1a | 256 | return is_my_mac; |
c6c8fea2 SE |
257 | } |
258 | ||
30da63a6 ML |
259 | /** |
260 | * batadv_seq_print_text_primary_if_get - called from debugfs table printing | |
261 | * function that requires the primary interface | |
262 | * @seq: debugfs table seq_file struct | |
263 | * | |
264 | * Returns primary interface if found or NULL otherwise. | |
265 | */ | |
266 | struct batadv_hard_iface * | |
267 | batadv_seq_print_text_primary_if_get(struct seq_file *seq) | |
268 | { | |
269 | struct net_device *net_dev = (struct net_device *)seq->private; | |
270 | struct batadv_priv *bat_priv = netdev_priv(net_dev); | |
271 | struct batadv_hard_iface *primary_if; | |
272 | ||
273 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
274 | ||
275 | if (!primary_if) { | |
276 | seq_printf(seq, | |
277 | "BATMAN mesh %s disabled - please specify interfaces to enable it\n", | |
278 | net_dev->name); | |
279 | goto out; | |
280 | } | |
281 | ||
282 | if (primary_if->if_status == BATADV_IF_ACTIVE) | |
283 | goto out; | |
284 | ||
285 | seq_printf(seq, | |
286 | "BATMAN mesh %s disabled - primary interface not active\n", | |
287 | net_dev->name); | |
288 | batadv_hardif_free_ref(primary_if); | |
289 | primary_if = NULL; | |
290 | ||
291 | out: | |
292 | return primary_if; | |
293 | } | |
294 | ||
411d6ed9 ML |
295 | /** |
296 | * batadv_max_header_len - calculate maximum encapsulation overhead for a | |
297 | * payload packet | |
298 | * | |
299 | * Return the maximum encapsulation overhead in bytes. | |
300 | */ | |
301 | int batadv_max_header_len(void) | |
302 | { | |
303 | int header_len = 0; | |
304 | ||
305 | header_len = max_t(int, header_len, | |
306 | sizeof(struct batadv_unicast_packet)); | |
307 | header_len = max_t(int, header_len, | |
308 | sizeof(struct batadv_unicast_4addr_packet)); | |
309 | header_len = max_t(int, header_len, | |
310 | sizeof(struct batadv_bcast_packet)); | |
311 | ||
312 | #ifdef CONFIG_BATMAN_ADV_NC | |
313 | header_len = max_t(int, header_len, | |
314 | sizeof(struct batadv_coded_packet)); | |
315 | #endif | |
316 | ||
1df0cbd5 | 317 | return header_len + ETH_HLEN; |
411d6ed9 ML |
318 | } |
319 | ||
c54f38c9 SW |
320 | /** |
321 | * batadv_skb_set_priority - sets skb priority according to packet content | |
322 | * @skb: the packet to be sent | |
323 | * @offset: offset to the packet content | |
324 | * | |
325 | * This function sets a value between 256 and 263 (802.1d priority), which | |
326 | * can be interpreted by the cfg80211 or other drivers. | |
327 | */ | |
328 | void batadv_skb_set_priority(struct sk_buff *skb, int offset) | |
329 | { | |
330 | struct iphdr ip_hdr_tmp, *ip_hdr; | |
331 | struct ipv6hdr ip6_hdr_tmp, *ip6_hdr; | |
332 | struct ethhdr ethhdr_tmp, *ethhdr; | |
333 | struct vlan_ethhdr *vhdr, vhdr_tmp; | |
334 | u32 prio; | |
335 | ||
336 | /* already set, do nothing */ | |
337 | if (skb->priority >= 256 && skb->priority <= 263) | |
338 | return; | |
339 | ||
340 | ethhdr = skb_header_pointer(skb, offset, sizeof(*ethhdr), ðhdr_tmp); | |
341 | if (!ethhdr) | |
342 | return; | |
343 | ||
344 | switch (ethhdr->h_proto) { | |
345 | case htons(ETH_P_8021Q): | |
346 | vhdr = skb_header_pointer(skb, offset + sizeof(*vhdr), | |
347 | sizeof(*vhdr), &vhdr_tmp); | |
348 | if (!vhdr) | |
349 | return; | |
350 | prio = ntohs(vhdr->h_vlan_TCI) & VLAN_PRIO_MASK; | |
351 | prio = prio >> VLAN_PRIO_SHIFT; | |
352 | break; | |
353 | case htons(ETH_P_IP): | |
354 | ip_hdr = skb_header_pointer(skb, offset + sizeof(*ethhdr), | |
355 | sizeof(*ip_hdr), &ip_hdr_tmp); | |
356 | if (!ip_hdr) | |
357 | return; | |
358 | prio = (ipv4_get_dsfield(ip_hdr) & 0xfc) >> 5; | |
359 | break; | |
360 | case htons(ETH_P_IPV6): | |
361 | ip6_hdr = skb_header_pointer(skb, offset + sizeof(*ethhdr), | |
362 | sizeof(*ip6_hdr), &ip6_hdr_tmp); | |
363 | if (!ip6_hdr) | |
364 | return; | |
365 | prio = (ipv6_get_dsfield(ip6_hdr) & 0xfc) >> 5; | |
366 | break; | |
367 | default: | |
368 | return; | |
369 | } | |
370 | ||
371 | skb->priority = prio + 256; | |
372 | } | |
373 | ||
ee11ad61 | 374 | static int batadv_recv_unhandled_packet(struct sk_buff *skb, |
56303d34 | 375 | struct batadv_hard_iface *recv_if) |
ffa995e0 ML |
376 | { |
377 | return NET_RX_DROP; | |
378 | } | |
379 | ||
380 | /* incoming packets with the batman ethertype received on any active hard | |
381 | * interface | |
382 | */ | |
3193e8fd SE |
383 | int batadv_batman_skb_recv(struct sk_buff *skb, struct net_device *dev, |
384 | struct packet_type *ptype, | |
385 | struct net_device *orig_dev) | |
ffa995e0 | 386 | { |
56303d34 | 387 | struct batadv_priv *bat_priv; |
96412690 | 388 | struct batadv_ogm_packet *batadv_ogm_packet; |
56303d34 | 389 | struct batadv_hard_iface *hard_iface; |
ffa995e0 ML |
390 | uint8_t idx; |
391 | int ret; | |
392 | ||
56303d34 SE |
393 | hard_iface = container_of(ptype, struct batadv_hard_iface, |
394 | batman_adv_ptype); | |
ffa995e0 ML |
395 | skb = skb_share_check(skb, GFP_ATOMIC); |
396 | ||
397 | /* skb was released by skb_share_check() */ | |
398 | if (!skb) | |
399 | goto err_out; | |
400 | ||
401 | /* packet should hold at least type and version */ | |
402 | if (unlikely(!pskb_may_pull(skb, 2))) | |
403 | goto err_free; | |
404 | ||
405 | /* expect a valid ethernet header here. */ | |
406 | if (unlikely(skb->mac_len != ETH_HLEN || !skb_mac_header(skb))) | |
407 | goto err_free; | |
408 | ||
409 | if (!hard_iface->soft_iface) | |
410 | goto err_free; | |
411 | ||
412 | bat_priv = netdev_priv(hard_iface->soft_iface); | |
413 | ||
39c75a51 | 414 | if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) |
ffa995e0 ML |
415 | goto err_free; |
416 | ||
417 | /* discard frames on not active interfaces */ | |
e9a4f295 | 418 | if (hard_iface->if_status != BATADV_IF_ACTIVE) |
ffa995e0 ML |
419 | goto err_free; |
420 | ||
96412690 | 421 | batadv_ogm_packet = (struct batadv_ogm_packet *)skb->data; |
ffa995e0 | 422 | |
a40d9b07 | 423 | if (batadv_ogm_packet->version != BATADV_COMPAT_VERSION) { |
39c75a51 | 424 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 425 | "Drop packet: incompatible batman version (%i)\n", |
a40d9b07 | 426 | batadv_ogm_packet->version); |
ffa995e0 ML |
427 | goto err_free; |
428 | } | |
429 | ||
e0d9677e MH |
430 | /* reset control block to avoid left overs from previous users */ |
431 | memset(skb->cb, 0, sizeof(struct batadv_skb_cb)); | |
432 | ||
ffa995e0 ML |
433 | /* all receive handlers return whether they received or reused |
434 | * the supplied skb. if not, we have to free the skb. | |
435 | */ | |
a40d9b07 | 436 | idx = batadv_ogm_packet->packet_type; |
ee11ad61 | 437 | ret = (*batadv_rx_handler[idx])(skb, hard_iface); |
ffa995e0 ML |
438 | |
439 | if (ret == NET_RX_DROP) | |
440 | kfree_skb(skb); | |
441 | ||
442 | /* return NET_RX_SUCCESS in any case as we | |
443 | * most probably dropped the packet for | |
444 | * routing-logical reasons. | |
445 | */ | |
446 | return NET_RX_SUCCESS; | |
447 | ||
448 | err_free: | |
449 | kfree_skb(skb); | |
450 | err_out: | |
451 | return NET_RX_DROP; | |
452 | } | |
453 | ||
ee11ad61 | 454 | static void batadv_recv_handler_init(void) |
ffa995e0 ML |
455 | { |
456 | int i; | |
457 | ||
ee11ad61 SE |
458 | for (i = 0; i < ARRAY_SIZE(batadv_rx_handler); i++) |
459 | batadv_rx_handler[i] = batadv_recv_unhandled_packet; | |
ffa995e0 | 460 | |
a1f1ac5c SW |
461 | for (i = BATADV_UNICAST_MIN; i <= BATADV_UNICAST_MAX; i++) |
462 | batadv_rx_handler[i] = batadv_recv_unhandled_unicast_packet; | |
463 | ||
031ace8d SW |
464 | /* compile time checks for sizes */ |
465 | BUILD_BUG_ON(sizeof(struct batadv_bla_claim_dst) != 6); | |
466 | BUILD_BUG_ON(sizeof(struct batadv_ogm_packet) != 24); | |
467 | BUILD_BUG_ON(sizeof(struct batadv_icmp_header) != 20); | |
468 | BUILD_BUG_ON(sizeof(struct batadv_icmp_packet) != 20); | |
469 | BUILD_BUG_ON(sizeof(struct batadv_icmp_packet_rr) != 116); | |
470 | BUILD_BUG_ON(sizeof(struct batadv_unicast_packet) != 10); | |
471 | BUILD_BUG_ON(sizeof(struct batadv_unicast_4addr_packet) != 18); | |
472 | BUILD_BUG_ON(sizeof(struct batadv_frag_packet) != 20); | |
473 | BUILD_BUG_ON(sizeof(struct batadv_bcast_packet) != 14); | |
474 | BUILD_BUG_ON(sizeof(struct batadv_coded_packet) != 46); | |
475 | BUILD_BUG_ON(sizeof(struct batadv_unicast_tvlv_packet) != 20); | |
476 | BUILD_BUG_ON(sizeof(struct batadv_tvlv_hdr) != 4); | |
477 | BUILD_BUG_ON(sizeof(struct batadv_tvlv_gateway_data) != 8); | |
478 | BUILD_BUG_ON(sizeof(struct batadv_tvlv_tt_vlan_data) != 8); | |
479 | BUILD_BUG_ON(sizeof(struct batadv_tvlv_tt_change) != 12); | |
480 | BUILD_BUG_ON(sizeof(struct batadv_tvlv_roam_adv) != 8); | |
80067c83 | 481 | |
a1f1ac5c SW |
482 | /* broadcast packet */ |
483 | batadv_rx_handler[BATADV_BCAST] = batadv_recv_bcast_packet; | |
484 | ||
485 | /* unicast packets ... */ | |
7cdcf6dd AQ |
486 | /* unicast with 4 addresses packet */ |
487 | batadv_rx_handler[BATADV_UNICAST_4ADDR] = batadv_recv_unicast_packet; | |
ffa995e0 | 488 | /* unicast packet */ |
acd34afa | 489 | batadv_rx_handler[BATADV_UNICAST] = batadv_recv_unicast_packet; |
ef261577 ML |
490 | /* unicast tvlv packet */ |
491 | batadv_rx_handler[BATADV_UNICAST_TVLV] = batadv_recv_unicast_tvlv; | |
a1f1ac5c SW |
492 | /* batman icmp packet */ |
493 | batadv_rx_handler[BATADV_ICMP] = batadv_recv_icmp_packet; | |
610bfc6b MH |
494 | /* Fragmented packets */ |
495 | batadv_rx_handler[BATADV_UNICAST_FRAG] = batadv_recv_frag_packet; | |
ffa995e0 ML |
496 | } |
497 | ||
56303d34 SE |
498 | int |
499 | batadv_recv_handler_register(uint8_t packet_type, | |
500 | int (*recv_handler)(struct sk_buff *, | |
501 | struct batadv_hard_iface *)) | |
ffa995e0 | 502 | { |
a1f1ac5c SW |
503 | int (*curr)(struct sk_buff *, |
504 | struct batadv_hard_iface *); | |
505 | curr = batadv_rx_handler[packet_type]; | |
506 | ||
507 | if ((curr != batadv_recv_unhandled_packet) && | |
508 | (curr != batadv_recv_unhandled_unicast_packet)) | |
ffa995e0 ML |
509 | return -EBUSY; |
510 | ||
ee11ad61 | 511 | batadv_rx_handler[packet_type] = recv_handler; |
ffa995e0 ML |
512 | return 0; |
513 | } | |
514 | ||
3193e8fd | 515 | void batadv_recv_handler_unregister(uint8_t packet_type) |
ffa995e0 | 516 | { |
ee11ad61 | 517 | batadv_rx_handler[packet_type] = batadv_recv_unhandled_packet; |
ffa995e0 ML |
518 | } |
519 | ||
56303d34 | 520 | static struct batadv_algo_ops *batadv_algo_get(char *name) |
1c280471 | 521 | { |
56303d34 | 522 | struct batadv_algo_ops *bat_algo_ops = NULL, *bat_algo_ops_tmp; |
1c280471 | 523 | |
b67bfe0d | 524 | hlist_for_each_entry(bat_algo_ops_tmp, &batadv_algo_list, list) { |
1c280471 ML |
525 | if (strcmp(bat_algo_ops_tmp->name, name) != 0) |
526 | continue; | |
527 | ||
528 | bat_algo_ops = bat_algo_ops_tmp; | |
529 | break; | |
530 | } | |
531 | ||
532 | return bat_algo_ops; | |
533 | } | |
534 | ||
56303d34 | 535 | int batadv_algo_register(struct batadv_algo_ops *bat_algo_ops) |
1c280471 | 536 | { |
56303d34 | 537 | struct batadv_algo_ops *bat_algo_ops_tmp; |
1c280471 | 538 | |
ee11ad61 | 539 | bat_algo_ops_tmp = batadv_algo_get(bat_algo_ops->name); |
1c280471 | 540 | if (bat_algo_ops_tmp) { |
86ceb360 SE |
541 | pr_info("Trying to register already registered routing algorithm: %s\n", |
542 | bat_algo_ops->name); | |
9fb6c651 | 543 | return -EEXIST; |
1c280471 ML |
544 | } |
545 | ||
01c4224b | 546 | /* all algorithms must implement all ops (for now) */ |
c2aca022 | 547 | if (!bat_algo_ops->bat_iface_enable || |
00a50076 | 548 | !bat_algo_ops->bat_iface_disable || |
c3229398 | 549 | !bat_algo_ops->bat_iface_update_mac || |
cd8b78e7 | 550 | !bat_algo_ops->bat_primary_iface_set || |
01c4224b | 551 | !bat_algo_ops->bat_ogm_schedule || |
a3285a8f | 552 | !bat_algo_ops->bat_ogm_emit || |
c43c981e AQ |
553 | !bat_algo_ops->bat_neigh_cmp || |
554 | !bat_algo_ops->bat_neigh_is_equiv_or_better) { | |
01c4224b ML |
555 | pr_info("Routing algo '%s' does not implement required ops\n", |
556 | bat_algo_ops->name); | |
9fb6c651 | 557 | return -EINVAL; |
01c4224b ML |
558 | } |
559 | ||
1c280471 | 560 | INIT_HLIST_NODE(&bat_algo_ops->list); |
ee11ad61 | 561 | hlist_add_head(&bat_algo_ops->list, &batadv_algo_list); |
1c280471 | 562 | |
9fb6c651 | 563 | return 0; |
1c280471 ML |
564 | } |
565 | ||
56303d34 | 566 | int batadv_algo_select(struct batadv_priv *bat_priv, char *name) |
1c280471 | 567 | { |
56303d34 | 568 | struct batadv_algo_ops *bat_algo_ops; |
1c280471 | 569 | |
ee11ad61 | 570 | bat_algo_ops = batadv_algo_get(name); |
1c280471 | 571 | if (!bat_algo_ops) |
f372d090 | 572 | return -EINVAL; |
1c280471 ML |
573 | |
574 | bat_priv->bat_algo_ops = bat_algo_ops; | |
1c280471 | 575 | |
f372d090 | 576 | return 0; |
1c280471 ML |
577 | } |
578 | ||
3193e8fd | 579 | int batadv_algo_seq_print_text(struct seq_file *seq, void *offset) |
1c280471 | 580 | { |
56303d34 | 581 | struct batadv_algo_ops *bat_algo_ops; |
1c280471 | 582 | |
0c814653 | 583 | seq_puts(seq, "Available routing algorithms:\n"); |
1c280471 | 584 | |
b67bfe0d | 585 | hlist_for_each_entry(bat_algo_ops, &batadv_algo_list, list) { |
1c280471 ML |
586 | seq_printf(seq, "%s\n", bat_algo_ops->name); |
587 | } | |
588 | ||
589 | return 0; | |
590 | } | |
591 | ||
95a066d8 SE |
592 | /** |
593 | * batadv_skb_crc32 - calculate CRC32 of the whole packet and skip bytes in | |
594 | * the header | |
595 | * @skb: skb pointing to fragmented socket buffers | |
596 | * @payload_ptr: Pointer to position inside the head buffer of the skb | |
597 | * marking the start of the data to be CRC'ed | |
598 | * | |
599 | * payload_ptr must always point to an address in the skb head buffer and not to | |
600 | * a fragment. | |
601 | */ | |
602 | __be32 batadv_skb_crc32(struct sk_buff *skb, u8 *payload_ptr) | |
603 | { | |
604 | u32 crc = 0; | |
605 | unsigned int from; | |
606 | unsigned int to = skb->len; | |
607 | struct skb_seq_state st; | |
608 | const u8 *data; | |
609 | unsigned int len; | |
610 | unsigned int consumed = 0; | |
611 | ||
612 | from = (unsigned int)(payload_ptr - skb->data); | |
613 | ||
614 | skb_prepare_seq_read(skb, from, to, &st); | |
615 | while ((len = skb_seq_read(consumed, &data, &st)) != 0) { | |
616 | crc = crc32c(crc, data, len); | |
617 | consumed += len; | |
618 | } | |
95a066d8 SE |
619 | |
620 | return htonl(crc); | |
621 | } | |
622 | ||
ef261577 ML |
623 | /** |
624 | * batadv_tvlv_handler_free_ref - decrement the tvlv handler refcounter and | |
625 | * possibly free it | |
626 | * @tvlv_handler: the tvlv handler to free | |
627 | */ | |
628 | static void | |
629 | batadv_tvlv_handler_free_ref(struct batadv_tvlv_handler *tvlv_handler) | |
630 | { | |
631 | if (atomic_dec_and_test(&tvlv_handler->refcount)) | |
632 | kfree_rcu(tvlv_handler, rcu); | |
633 | } | |
634 | ||
635 | /** | |
636 | * batadv_tvlv_handler_get - retrieve tvlv handler from the tvlv handler list | |
637 | * based on the provided type and version (both need to match) | |
638 | * @bat_priv: the bat priv with all the soft interface information | |
639 | * @type: tvlv handler type to look for | |
640 | * @version: tvlv handler version to look for | |
641 | * | |
642 | * Returns tvlv handler if found or NULL otherwise. | |
643 | */ | |
644 | static struct batadv_tvlv_handler | |
645 | *batadv_tvlv_handler_get(struct batadv_priv *bat_priv, | |
646 | uint8_t type, uint8_t version) | |
647 | { | |
648 | struct batadv_tvlv_handler *tvlv_handler_tmp, *tvlv_handler = NULL; | |
649 | ||
650 | rcu_read_lock(); | |
651 | hlist_for_each_entry_rcu(tvlv_handler_tmp, | |
652 | &bat_priv->tvlv.handler_list, list) { | |
653 | if (tvlv_handler_tmp->type != type) | |
654 | continue; | |
655 | ||
656 | if (tvlv_handler_tmp->version != version) | |
657 | continue; | |
658 | ||
659 | if (!atomic_inc_not_zero(&tvlv_handler_tmp->refcount)) | |
660 | continue; | |
661 | ||
662 | tvlv_handler = tvlv_handler_tmp; | |
663 | break; | |
664 | } | |
665 | rcu_read_unlock(); | |
666 | ||
667 | return tvlv_handler; | |
668 | } | |
669 | ||
670 | /** | |
671 | * batadv_tvlv_container_free_ref - decrement the tvlv container refcounter and | |
672 | * possibly free it | |
a0e28775 | 673 | * @tvlv: the tvlv container to free |
ef261577 ML |
674 | */ |
675 | static void batadv_tvlv_container_free_ref(struct batadv_tvlv_container *tvlv) | |
676 | { | |
677 | if (atomic_dec_and_test(&tvlv->refcount)) | |
678 | kfree(tvlv); | |
679 | } | |
680 | ||
681 | /** | |
682 | * batadv_tvlv_container_get - retrieve tvlv container from the tvlv container | |
683 | * list based on the provided type and version (both need to match) | |
684 | * @bat_priv: the bat priv with all the soft interface information | |
685 | * @type: tvlv container type to look for | |
686 | * @version: tvlv container version to look for | |
687 | * | |
688 | * Has to be called with the appropriate locks being acquired | |
689 | * (tvlv.container_list_lock). | |
690 | * | |
691 | * Returns tvlv container if found or NULL otherwise. | |
692 | */ | |
693 | static struct batadv_tvlv_container | |
694 | *batadv_tvlv_container_get(struct batadv_priv *bat_priv, | |
695 | uint8_t type, uint8_t version) | |
696 | { | |
697 | struct batadv_tvlv_container *tvlv_tmp, *tvlv = NULL; | |
698 | ||
699 | hlist_for_each_entry(tvlv_tmp, &bat_priv->tvlv.container_list, list) { | |
700 | if (tvlv_tmp->tvlv_hdr.type != type) | |
701 | continue; | |
702 | ||
703 | if (tvlv_tmp->tvlv_hdr.version != version) | |
704 | continue; | |
705 | ||
706 | if (!atomic_inc_not_zero(&tvlv_tmp->refcount)) | |
707 | continue; | |
708 | ||
709 | tvlv = tvlv_tmp; | |
710 | break; | |
711 | } | |
712 | ||
713 | return tvlv; | |
714 | } | |
715 | ||
716 | /** | |
717 | * batadv_tvlv_container_list_size - calculate the size of the tvlv container | |
718 | * list entries | |
719 | * @bat_priv: the bat priv with all the soft interface information | |
720 | * | |
721 | * Has to be called with the appropriate locks being acquired | |
722 | * (tvlv.container_list_lock). | |
723 | * | |
724 | * Returns size of all currently registered tvlv containers in bytes. | |
725 | */ | |
726 | static uint16_t batadv_tvlv_container_list_size(struct batadv_priv *bat_priv) | |
727 | { | |
728 | struct batadv_tvlv_container *tvlv; | |
729 | uint16_t tvlv_len = 0; | |
730 | ||
731 | hlist_for_each_entry(tvlv, &bat_priv->tvlv.container_list, list) { | |
732 | tvlv_len += sizeof(struct batadv_tvlv_hdr); | |
733 | tvlv_len += ntohs(tvlv->tvlv_hdr.len); | |
734 | } | |
735 | ||
736 | return tvlv_len; | |
737 | } | |
738 | ||
739 | /** | |
740 | * batadv_tvlv_container_remove - remove tvlv container from the tvlv container | |
741 | * list | |
742 | * @tvlv: the to be removed tvlv container | |
743 | * | |
744 | * Has to be called with the appropriate locks being acquired | |
745 | * (tvlv.container_list_lock). | |
746 | */ | |
747 | static void batadv_tvlv_container_remove(struct batadv_tvlv_container *tvlv) | |
748 | { | |
749 | if (!tvlv) | |
750 | return; | |
751 | ||
752 | hlist_del(&tvlv->list); | |
753 | ||
754 | /* first call to decrement the counter, second call to free */ | |
755 | batadv_tvlv_container_free_ref(tvlv); | |
756 | batadv_tvlv_container_free_ref(tvlv); | |
757 | } | |
758 | ||
759 | /** | |
760 | * batadv_tvlv_container_unregister - unregister tvlv container based on the | |
761 | * provided type and version (both need to match) | |
762 | * @bat_priv: the bat priv with all the soft interface information | |
763 | * @type: tvlv container type to unregister | |
764 | * @version: tvlv container type to unregister | |
765 | */ | |
766 | void batadv_tvlv_container_unregister(struct batadv_priv *bat_priv, | |
767 | uint8_t type, uint8_t version) | |
768 | { | |
769 | struct batadv_tvlv_container *tvlv; | |
770 | ||
771 | spin_lock_bh(&bat_priv->tvlv.container_list_lock); | |
772 | tvlv = batadv_tvlv_container_get(bat_priv, type, version); | |
773 | batadv_tvlv_container_remove(tvlv); | |
774 | spin_unlock_bh(&bat_priv->tvlv.container_list_lock); | |
775 | } | |
776 | ||
777 | /** | |
778 | * batadv_tvlv_container_register - register tvlv type, version and content | |
779 | * to be propagated with each (primary interface) OGM | |
780 | * @bat_priv: the bat priv with all the soft interface information | |
781 | * @type: tvlv container type | |
782 | * @version: tvlv container version | |
783 | * @tvlv_value: tvlv container content | |
784 | * @tvlv_value_len: tvlv container content length | |
785 | * | |
786 | * If a container of the same type and version was already registered the new | |
787 | * content is going to replace the old one. | |
788 | */ | |
789 | void batadv_tvlv_container_register(struct batadv_priv *bat_priv, | |
790 | uint8_t type, uint8_t version, | |
791 | void *tvlv_value, uint16_t tvlv_value_len) | |
792 | { | |
793 | struct batadv_tvlv_container *tvlv_old, *tvlv_new; | |
794 | ||
795 | if (!tvlv_value) | |
796 | tvlv_value_len = 0; | |
797 | ||
798 | tvlv_new = kzalloc(sizeof(*tvlv_new) + tvlv_value_len, GFP_ATOMIC); | |
799 | if (!tvlv_new) | |
800 | return; | |
801 | ||
802 | tvlv_new->tvlv_hdr.version = version; | |
803 | tvlv_new->tvlv_hdr.type = type; | |
804 | tvlv_new->tvlv_hdr.len = htons(tvlv_value_len); | |
805 | ||
806 | memcpy(tvlv_new + 1, tvlv_value, ntohs(tvlv_new->tvlv_hdr.len)); | |
807 | INIT_HLIST_NODE(&tvlv_new->list); | |
808 | atomic_set(&tvlv_new->refcount, 1); | |
809 | ||
810 | spin_lock_bh(&bat_priv->tvlv.container_list_lock); | |
811 | tvlv_old = batadv_tvlv_container_get(bat_priv, type, version); | |
812 | batadv_tvlv_container_remove(tvlv_old); | |
813 | hlist_add_head(&tvlv_new->list, &bat_priv->tvlv.container_list); | |
814 | spin_unlock_bh(&bat_priv->tvlv.container_list_lock); | |
815 | } | |
816 | ||
817 | /** | |
3f68785e | 818 | * batadv_tvlv_realloc_packet_buff - reallocate packet buffer to accommodate |
ef261577 ML |
819 | * requested packet size |
820 | * @packet_buff: packet buffer | |
821 | * @packet_buff_len: packet buffer size | |
a0e28775 | 822 | * @min_packet_len: requested packet minimum size |
ef261577 ML |
823 | * @additional_packet_len: requested additional packet size on top of minimum |
824 | * size | |
825 | * | |
826 | * Returns true of the packet buffer could be changed to the requested size, | |
827 | * false otherwise. | |
828 | */ | |
829 | static bool batadv_tvlv_realloc_packet_buff(unsigned char **packet_buff, | |
830 | int *packet_buff_len, | |
831 | int min_packet_len, | |
832 | int additional_packet_len) | |
833 | { | |
834 | unsigned char *new_buff; | |
835 | ||
836 | new_buff = kmalloc(min_packet_len + additional_packet_len, GFP_ATOMIC); | |
837 | ||
838 | /* keep old buffer if kmalloc should fail */ | |
16b9ce83 MP |
839 | if (!new_buff) |
840 | return false; | |
841 | ||
842 | memcpy(new_buff, *packet_buff, min_packet_len); | |
843 | kfree(*packet_buff); | |
844 | *packet_buff = new_buff; | |
845 | *packet_buff_len = min_packet_len + additional_packet_len; | |
ef261577 | 846 | |
16b9ce83 | 847 | return true; |
ef261577 ML |
848 | } |
849 | ||
850 | /** | |
851 | * batadv_tvlv_container_ogm_append - append tvlv container content to given | |
852 | * OGM packet buffer | |
853 | * @bat_priv: the bat priv with all the soft interface information | |
854 | * @packet_buff: ogm packet buffer | |
855 | * @packet_buff_len: ogm packet buffer size including ogm header and tvlv | |
856 | * content | |
857 | * @packet_min_len: ogm header size to be preserved for the OGM itself | |
858 | * | |
859 | * The ogm packet might be enlarged or shrunk depending on the current size | |
860 | * and the size of the to-be-appended tvlv containers. | |
861 | * | |
862 | * Returns size of all appended tvlv containers in bytes. | |
863 | */ | |
864 | uint16_t batadv_tvlv_container_ogm_append(struct batadv_priv *bat_priv, | |
865 | unsigned char **packet_buff, | |
866 | int *packet_buff_len, | |
867 | int packet_min_len) | |
868 | { | |
869 | struct batadv_tvlv_container *tvlv; | |
870 | struct batadv_tvlv_hdr *tvlv_hdr; | |
871 | uint16_t tvlv_value_len; | |
872 | void *tvlv_value; | |
873 | bool ret; | |
874 | ||
875 | spin_lock_bh(&bat_priv->tvlv.container_list_lock); | |
876 | tvlv_value_len = batadv_tvlv_container_list_size(bat_priv); | |
877 | ||
878 | ret = batadv_tvlv_realloc_packet_buff(packet_buff, packet_buff_len, | |
879 | packet_min_len, tvlv_value_len); | |
880 | ||
881 | if (!ret) | |
882 | goto end; | |
883 | ||
884 | if (!tvlv_value_len) | |
885 | goto end; | |
886 | ||
887 | tvlv_value = (*packet_buff) + packet_min_len; | |
888 | ||
889 | hlist_for_each_entry(tvlv, &bat_priv->tvlv.container_list, list) { | |
890 | tvlv_hdr = tvlv_value; | |
891 | tvlv_hdr->type = tvlv->tvlv_hdr.type; | |
892 | tvlv_hdr->version = tvlv->tvlv_hdr.version; | |
893 | tvlv_hdr->len = tvlv->tvlv_hdr.len; | |
894 | tvlv_value = tvlv_hdr + 1; | |
895 | memcpy(tvlv_value, tvlv + 1, ntohs(tvlv->tvlv_hdr.len)); | |
896 | tvlv_value = (uint8_t *)tvlv_value + ntohs(tvlv->tvlv_hdr.len); | |
897 | } | |
898 | ||
899 | end: | |
900 | spin_unlock_bh(&bat_priv->tvlv.container_list_lock); | |
901 | return tvlv_value_len; | |
902 | } | |
903 | ||
904 | /** | |
905 | * batadv_tvlv_call_handler - parse the given tvlv buffer to call the | |
906 | * appropriate handlers | |
907 | * @bat_priv: the bat priv with all the soft interface information | |
908 | * @tvlv_handler: tvlv callback function handling the tvlv content | |
909 | * @ogm_source: flag indicating wether the tvlv is an ogm or a unicast packet | |
910 | * @orig_node: orig node emitting the ogm packet | |
911 | * @src: source mac address of the unicast packet | |
912 | * @dst: destination mac address of the unicast packet | |
913 | * @tvlv_value: tvlv content | |
914 | * @tvlv_value_len: tvlv content length | |
915 | * | |
916 | * Returns success if handler was not found or the return value of the handler | |
917 | * callback. | |
918 | */ | |
919 | static int batadv_tvlv_call_handler(struct batadv_priv *bat_priv, | |
920 | struct batadv_tvlv_handler *tvlv_handler, | |
921 | bool ogm_source, | |
922 | struct batadv_orig_node *orig_node, | |
923 | uint8_t *src, uint8_t *dst, | |
924 | void *tvlv_value, uint16_t tvlv_value_len) | |
925 | { | |
926 | if (!tvlv_handler) | |
927 | return NET_RX_SUCCESS; | |
928 | ||
929 | if (ogm_source) { | |
930 | if (!tvlv_handler->ogm_handler) | |
931 | return NET_RX_SUCCESS; | |
932 | ||
933 | if (!orig_node) | |
934 | return NET_RX_SUCCESS; | |
935 | ||
936 | tvlv_handler->ogm_handler(bat_priv, orig_node, | |
937 | BATADV_NO_FLAGS, | |
938 | tvlv_value, tvlv_value_len); | |
939 | tvlv_handler->flags |= BATADV_TVLV_HANDLER_OGM_CALLED; | |
940 | } else { | |
941 | if (!src) | |
942 | return NET_RX_SUCCESS; | |
943 | ||
944 | if (!dst) | |
945 | return NET_RX_SUCCESS; | |
946 | ||
947 | if (!tvlv_handler->unicast_handler) | |
948 | return NET_RX_SUCCESS; | |
949 | ||
950 | return tvlv_handler->unicast_handler(bat_priv, src, | |
951 | dst, tvlv_value, | |
952 | tvlv_value_len); | |
953 | } | |
954 | ||
955 | return NET_RX_SUCCESS; | |
956 | } | |
957 | ||
958 | /** | |
959 | * batadv_tvlv_containers_process - parse the given tvlv buffer to call the | |
960 | * appropriate handlers | |
961 | * @bat_priv: the bat priv with all the soft interface information | |
962 | * @ogm_source: flag indicating wether the tvlv is an ogm or a unicast packet | |
963 | * @orig_node: orig node emitting the ogm packet | |
964 | * @src: source mac address of the unicast packet | |
965 | * @dst: destination mac address of the unicast packet | |
966 | * @tvlv_value: tvlv content | |
967 | * @tvlv_value_len: tvlv content length | |
968 | * | |
969 | * Returns success when processing an OGM or the return value of all called | |
970 | * handler callbacks. | |
971 | */ | |
972 | int batadv_tvlv_containers_process(struct batadv_priv *bat_priv, | |
973 | bool ogm_source, | |
974 | struct batadv_orig_node *orig_node, | |
975 | uint8_t *src, uint8_t *dst, | |
976 | void *tvlv_value, uint16_t tvlv_value_len) | |
977 | { | |
978 | struct batadv_tvlv_handler *tvlv_handler; | |
979 | struct batadv_tvlv_hdr *tvlv_hdr; | |
980 | uint16_t tvlv_value_cont_len; | |
981 | uint8_t cifnotfound = BATADV_TVLV_HANDLER_OGM_CIFNOTFND; | |
982 | int ret = NET_RX_SUCCESS; | |
983 | ||
984 | while (tvlv_value_len >= sizeof(*tvlv_hdr)) { | |
985 | tvlv_hdr = tvlv_value; | |
986 | tvlv_value_cont_len = ntohs(tvlv_hdr->len); | |
987 | tvlv_value = tvlv_hdr + 1; | |
988 | tvlv_value_len -= sizeof(*tvlv_hdr); | |
989 | ||
990 | if (tvlv_value_cont_len > tvlv_value_len) | |
991 | break; | |
992 | ||
993 | tvlv_handler = batadv_tvlv_handler_get(bat_priv, | |
994 | tvlv_hdr->type, | |
995 | tvlv_hdr->version); | |
996 | ||
997 | ret |= batadv_tvlv_call_handler(bat_priv, tvlv_handler, | |
998 | ogm_source, orig_node, | |
999 | src, dst, tvlv_value, | |
1000 | tvlv_value_cont_len); | |
1001 | if (tvlv_handler) | |
1002 | batadv_tvlv_handler_free_ref(tvlv_handler); | |
1003 | tvlv_value = (uint8_t *)tvlv_value + tvlv_value_cont_len; | |
1004 | tvlv_value_len -= tvlv_value_cont_len; | |
1005 | } | |
1006 | ||
1007 | if (!ogm_source) | |
1008 | return ret; | |
1009 | ||
1010 | rcu_read_lock(); | |
1011 | hlist_for_each_entry_rcu(tvlv_handler, | |
1012 | &bat_priv->tvlv.handler_list, list) { | |
1013 | if ((tvlv_handler->flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND) && | |
1014 | !(tvlv_handler->flags & BATADV_TVLV_HANDLER_OGM_CALLED)) | |
1015 | tvlv_handler->ogm_handler(bat_priv, orig_node, | |
1016 | cifnotfound, NULL, 0); | |
1017 | ||
1018 | tvlv_handler->flags &= ~BATADV_TVLV_HANDLER_OGM_CALLED; | |
1019 | } | |
1020 | rcu_read_unlock(); | |
1021 | ||
1022 | return NET_RX_SUCCESS; | |
1023 | } | |
1024 | ||
1025 | /** | |
1026 | * batadv_tvlv_ogm_receive - process an incoming ogm and call the appropriate | |
1027 | * handlers | |
1028 | * @bat_priv: the bat priv with all the soft interface information | |
1029 | * @batadv_ogm_packet: ogm packet containing the tvlv containers | |
1030 | * @orig_node: orig node emitting the ogm packet | |
1031 | */ | |
1032 | void batadv_tvlv_ogm_receive(struct batadv_priv *bat_priv, | |
1033 | struct batadv_ogm_packet *batadv_ogm_packet, | |
1034 | struct batadv_orig_node *orig_node) | |
1035 | { | |
1036 | void *tvlv_value; | |
1037 | uint16_t tvlv_value_len; | |
1038 | ||
1039 | if (!batadv_ogm_packet) | |
1040 | return; | |
1041 | ||
1042 | tvlv_value_len = ntohs(batadv_ogm_packet->tvlv_len); | |
1043 | if (!tvlv_value_len) | |
1044 | return; | |
1045 | ||
1046 | tvlv_value = batadv_ogm_packet + 1; | |
1047 | ||
1048 | batadv_tvlv_containers_process(bat_priv, true, orig_node, NULL, NULL, | |
1049 | tvlv_value, tvlv_value_len); | |
1050 | } | |
1051 | ||
1052 | /** | |
1053 | * batadv_tvlv_handler_register - register tvlv handler based on the provided | |
1054 | * type and version (both need to match) for ogm tvlv payload and/or unicast | |
1055 | * payload | |
1056 | * @bat_priv: the bat priv with all the soft interface information | |
1057 | * @optr: ogm tvlv handler callback function. This function receives the orig | |
1058 | * node, flags and the tvlv content as argument to process. | |
1059 | * @uptr: unicast tvlv handler callback function. This function receives the | |
1060 | * source & destination of the unicast packet as well as the tvlv content | |
1061 | * to process. | |
1062 | * @type: tvlv handler type to be registered | |
1063 | * @version: tvlv handler version to be registered | |
1064 | * @flags: flags to enable or disable TVLV API behavior | |
1065 | */ | |
1066 | void batadv_tvlv_handler_register(struct batadv_priv *bat_priv, | |
1067 | void (*optr)(struct batadv_priv *bat_priv, | |
1068 | struct batadv_orig_node *orig, | |
1069 | uint8_t flags, | |
1070 | void *tvlv_value, | |
1071 | uint16_t tvlv_value_len), | |
1072 | int (*uptr)(struct batadv_priv *bat_priv, | |
1073 | uint8_t *src, uint8_t *dst, | |
1074 | void *tvlv_value, | |
1075 | uint16_t tvlv_value_len), | |
1076 | uint8_t type, uint8_t version, uint8_t flags) | |
1077 | { | |
1078 | struct batadv_tvlv_handler *tvlv_handler; | |
1079 | ||
1080 | tvlv_handler = batadv_tvlv_handler_get(bat_priv, type, version); | |
1081 | if (tvlv_handler) { | |
1082 | batadv_tvlv_handler_free_ref(tvlv_handler); | |
1083 | return; | |
1084 | } | |
1085 | ||
1086 | tvlv_handler = kzalloc(sizeof(*tvlv_handler), GFP_ATOMIC); | |
1087 | if (!tvlv_handler) | |
1088 | return; | |
1089 | ||
1090 | tvlv_handler->ogm_handler = optr; | |
1091 | tvlv_handler->unicast_handler = uptr; | |
1092 | tvlv_handler->type = type; | |
1093 | tvlv_handler->version = version; | |
1094 | tvlv_handler->flags = flags; | |
1095 | atomic_set(&tvlv_handler->refcount, 1); | |
1096 | INIT_HLIST_NODE(&tvlv_handler->list); | |
1097 | ||
1098 | spin_lock_bh(&bat_priv->tvlv.handler_list_lock); | |
1099 | hlist_add_head_rcu(&tvlv_handler->list, &bat_priv->tvlv.handler_list); | |
1100 | spin_unlock_bh(&bat_priv->tvlv.handler_list_lock); | |
1101 | } | |
1102 | ||
1103 | /** | |
1104 | * batadv_tvlv_handler_unregister - unregister tvlv handler based on the | |
1105 | * provided type and version (both need to match) | |
1106 | * @bat_priv: the bat priv with all the soft interface information | |
1107 | * @type: tvlv handler type to be unregistered | |
1108 | * @version: tvlv handler version to be unregistered | |
1109 | */ | |
1110 | void batadv_tvlv_handler_unregister(struct batadv_priv *bat_priv, | |
1111 | uint8_t type, uint8_t version) | |
1112 | { | |
1113 | struct batadv_tvlv_handler *tvlv_handler; | |
1114 | ||
1115 | tvlv_handler = batadv_tvlv_handler_get(bat_priv, type, version); | |
1116 | if (!tvlv_handler) | |
1117 | return; | |
1118 | ||
1119 | batadv_tvlv_handler_free_ref(tvlv_handler); | |
1120 | spin_lock_bh(&bat_priv->tvlv.handler_list_lock); | |
1121 | hlist_del_rcu(&tvlv_handler->list); | |
1122 | spin_unlock_bh(&bat_priv->tvlv.handler_list_lock); | |
1123 | batadv_tvlv_handler_free_ref(tvlv_handler); | |
1124 | } | |
1125 | ||
1126 | /** | |
1127 | * batadv_tvlv_unicast_send - send a unicast packet with tvlv payload to the | |
1128 | * specified host | |
1129 | * @bat_priv: the bat priv with all the soft interface information | |
1130 | * @src: source mac address of the unicast packet | |
1131 | * @dst: destination mac address of the unicast packet | |
1132 | * @type: tvlv type | |
1133 | * @version: tvlv version | |
1134 | * @tvlv_value: tvlv content | |
1135 | * @tvlv_value_len: tvlv content length | |
1136 | */ | |
1137 | void batadv_tvlv_unicast_send(struct batadv_priv *bat_priv, uint8_t *src, | |
1138 | uint8_t *dst, uint8_t type, uint8_t version, | |
1139 | void *tvlv_value, uint16_t tvlv_value_len) | |
1140 | { | |
1141 | struct batadv_unicast_tvlv_packet *unicast_tvlv_packet; | |
1142 | struct batadv_tvlv_hdr *tvlv_hdr; | |
1143 | struct batadv_orig_node *orig_node; | |
1144 | struct sk_buff *skb = NULL; | |
1145 | unsigned char *tvlv_buff; | |
1146 | unsigned int tvlv_len; | |
1147 | ssize_t hdr_len = sizeof(*unicast_tvlv_packet); | |
1148 | bool ret = false; | |
1149 | ||
1150 | orig_node = batadv_orig_hash_find(bat_priv, dst); | |
1151 | if (!orig_node) | |
1152 | goto out; | |
1153 | ||
1154 | tvlv_len = sizeof(*tvlv_hdr) + tvlv_value_len; | |
1155 | ||
1156 | skb = netdev_alloc_skb_ip_align(NULL, ETH_HLEN + hdr_len + tvlv_len); | |
1157 | if (!skb) | |
1158 | goto out; | |
1159 | ||
1160 | skb->priority = TC_PRIO_CONTROL; | |
1161 | skb_reserve(skb, ETH_HLEN); | |
1162 | tvlv_buff = skb_put(skb, sizeof(*unicast_tvlv_packet) + tvlv_len); | |
1163 | unicast_tvlv_packet = (struct batadv_unicast_tvlv_packet *)tvlv_buff; | |
a40d9b07 SW |
1164 | unicast_tvlv_packet->packet_type = BATADV_UNICAST_TVLV; |
1165 | unicast_tvlv_packet->version = BATADV_COMPAT_VERSION; | |
1166 | unicast_tvlv_packet->ttl = BATADV_TTL; | |
ef261577 ML |
1167 | unicast_tvlv_packet->reserved = 0; |
1168 | unicast_tvlv_packet->tvlv_len = htons(tvlv_len); | |
1169 | unicast_tvlv_packet->align = 0; | |
8fdd0153 AQ |
1170 | ether_addr_copy(unicast_tvlv_packet->src, src); |
1171 | ether_addr_copy(unicast_tvlv_packet->dst, dst); | |
ef261577 ML |
1172 | |
1173 | tvlv_buff = (unsigned char *)(unicast_tvlv_packet + 1); | |
1174 | tvlv_hdr = (struct batadv_tvlv_hdr *)tvlv_buff; | |
1175 | tvlv_hdr->version = version; | |
1176 | tvlv_hdr->type = type; | |
1177 | tvlv_hdr->len = htons(tvlv_value_len); | |
1178 | tvlv_buff += sizeof(*tvlv_hdr); | |
1179 | memcpy(tvlv_buff, tvlv_value, tvlv_value_len); | |
1180 | ||
1181 | if (batadv_send_skb_to_orig(skb, orig_node, NULL) != NET_XMIT_DROP) | |
1182 | ret = true; | |
1183 | ||
1184 | out: | |
1185 | if (skb && !ret) | |
1186 | kfree_skb(skb); | |
1187 | if (orig_node) | |
1188 | batadv_orig_node_free_ref(orig_node); | |
1189 | } | |
1190 | ||
c018ad3d AQ |
1191 | /** |
1192 | * batadv_get_vid - extract the VLAN identifier from skb if any | |
1193 | * @skb: the buffer containing the packet | |
1194 | * @header_len: length of the batman header preceding the ethernet header | |
1195 | * | |
1196 | * If the packet embedded in the skb is vlan tagged this function returns the | |
1197 | * VID with the BATADV_VLAN_HAS_TAG flag. Otherwise BATADV_NO_FLAGS is returned. | |
1198 | */ | |
1199 | unsigned short batadv_get_vid(struct sk_buff *skb, size_t header_len) | |
1200 | { | |
1201 | struct ethhdr *ethhdr = (struct ethhdr *)(skb->data + header_len); | |
1202 | struct vlan_ethhdr *vhdr; | |
1203 | unsigned short vid; | |
1204 | ||
1205 | if (ethhdr->h_proto != htons(ETH_P_8021Q)) | |
1206 | return BATADV_NO_FLAGS; | |
1207 | ||
1208 | if (!pskb_may_pull(skb, header_len + VLAN_ETH_HLEN)) | |
1209 | return BATADV_NO_FLAGS; | |
1210 | ||
1211 | vhdr = (struct vlan_ethhdr *)(skb->data + header_len); | |
1212 | vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK; | |
1213 | vid |= BATADV_VLAN_HAS_TAG; | |
1214 | ||
1215 | return vid; | |
1216 | } | |
1217 | ||
eceb22ae AQ |
1218 | /** |
1219 | * batadv_vlan_ap_isola_get - return the AP isolation status for the given vlan | |
1220 | * @bat_priv: the bat priv with all the soft interface information | |
1221 | * @vid: the VLAN identifier for which the AP isolation attributed as to be | |
1222 | * looked up | |
1223 | * | |
1224 | * Returns true if AP isolation is on for the VLAN idenfied by vid, false | |
1225 | * otherwise | |
1226 | */ | |
1227 | bool batadv_vlan_ap_isola_get(struct batadv_priv *bat_priv, unsigned short vid) | |
1228 | { | |
1229 | bool ap_isolation_enabled = false; | |
1230 | struct batadv_softif_vlan *vlan; | |
1231 | ||
1232 | /* if the AP isolation is requested on a VLAN, then check for its | |
1233 | * setting in the proper VLAN private data structure | |
1234 | */ | |
1235 | vlan = batadv_softif_vlan_get(bat_priv, vid); | |
1236 | if (vlan) { | |
1237 | ap_isolation_enabled = atomic_read(&vlan->ap_isolation); | |
1238 | batadv_softif_vlan_free_ref(vlan); | |
1239 | } | |
1240 | ||
1241 | return ap_isolation_enabled; | |
1242 | } | |
1243 | ||
ee11ad61 | 1244 | static int batadv_param_set_ra(const char *val, const struct kernel_param *kp) |
d419be1f | 1245 | { |
56303d34 | 1246 | struct batadv_algo_ops *bat_algo_ops; |
d8cb5486 ML |
1247 | char *algo_name = (char *)val; |
1248 | size_t name_len = strlen(algo_name); | |
d419be1f | 1249 | |
293c9c1c | 1250 | if (name_len > 0 && algo_name[name_len - 1] == '\n') |
d8cb5486 ML |
1251 | algo_name[name_len - 1] = '\0'; |
1252 | ||
ee11ad61 | 1253 | bat_algo_ops = batadv_algo_get(algo_name); |
d419be1f | 1254 | if (!bat_algo_ops) { |
d8cb5486 | 1255 | pr_err("Routing algorithm '%s' is not supported\n", algo_name); |
d419be1f ML |
1256 | return -EINVAL; |
1257 | } | |
1258 | ||
d8cb5486 | 1259 | return param_set_copystring(algo_name, kp); |
d419be1f ML |
1260 | } |
1261 | ||
ee11ad61 SE |
1262 | static const struct kernel_param_ops batadv_param_ops_ra = { |
1263 | .set = batadv_param_set_ra, | |
d419be1f ML |
1264 | .get = param_get_string, |
1265 | }; | |
1266 | ||
ee11ad61 | 1267 | static struct kparam_string batadv_param_string_ra = { |
3193e8fd SE |
1268 | .maxlen = sizeof(batadv_routing_algo), |
1269 | .string = batadv_routing_algo, | |
d419be1f ML |
1270 | }; |
1271 | ||
ee11ad61 SE |
1272 | module_param_cb(routing_algo, &batadv_param_ops_ra, &batadv_param_string_ra, |
1273 | 0644); | |
1274 | module_init(batadv_init); | |
1275 | module_exit(batadv_exit); | |
c6c8fea2 SE |
1276 | |
1277 | MODULE_LICENSE("GPL"); | |
1278 | ||
42d0b044 SE |
1279 | MODULE_AUTHOR(BATADV_DRIVER_AUTHOR); |
1280 | MODULE_DESCRIPTION(BATADV_DRIVER_DESC); | |
1281 | MODULE_SUPPORTED_DEVICE(BATADV_DRIVER_DEVICE); | |
1282 | MODULE_VERSION(BATADV_SOURCE_VERSION); |