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