Commit | Line | Data |
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e19f9759 | 1 | /* Copyright (C) 2007-2014 B.A.T.M.A.N. contributors: |
c6c8fea2 SE |
2 | * |
3 | * Marek Lindner, Simon Wunderlich | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or | |
6 | * modify it under the terms of version 2 of the GNU General Public | |
7 | * License as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but | |
10 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | * General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
ebf38fb7 | 15 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
c6c8fea2 SE |
16 | */ |
17 | ||
95a066d8 SE |
18 | #include <linux/crc32c.h> |
19 | #include <linux/highmem.h> | |
c54f38c9 SW |
20 | #include <linux/if_vlan.h> |
21 | #include <net/ip.h> | |
22 | #include <net/ipv6.h> | |
23 | #include <net/dsfield.h> | |
c6c8fea2 | 24 | #include "main.h" |
b706b13b SE |
25 | #include "sysfs.h" |
26 | #include "debugfs.h" | |
c6c8fea2 SE |
27 | #include "routing.h" |
28 | #include "send.h" | |
29 | #include "originator.h" | |
30 | #include "soft-interface.h" | |
31 | #include "icmp_socket.h" | |
32 | #include "translation-table.h" | |
33 | #include "hard-interface.h" | |
34 | #include "gateway_client.h" | |
23721387 | 35 | #include "bridge_loop_avoidance.h" |
2f1dfbe1 | 36 | #include "distributed-arp-table.h" |
c5caf4ef | 37 | #include "multicast.h" |
414254e3 | 38 | #include "gateway_common.h" |
c6c8fea2 | 39 | #include "hash.h" |
1c280471 | 40 | #include "bat_algo.h" |
d353d8d4 | 41 | #include "network-coding.h" |
610bfc6b | 42 | #include "fragmentation.h" |
c6c8fea2 | 43 | |
c3caf519 SE |
44 | |
45 | /* List manipulations on hardif_list have to be rtnl_lock()'ed, | |
9cfc7bd6 SE |
46 | * list traversals just rcu-locked |
47 | */ | |
3193e8fd | 48 | struct list_head batadv_hardif_list; |
ee11ad61 | 49 | static int (*batadv_rx_handler[256])(struct sk_buff *, |
56303d34 | 50 | struct batadv_hard_iface *); |
3193e8fd | 51 | char batadv_routing_algo[20] = "BATMAN_IV"; |
ee11ad61 | 52 | static struct hlist_head batadv_algo_list; |
c6c8fea2 | 53 | |
3193e8fd | 54 | unsigned char batadv_broadcast_addr[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; |
c6c8fea2 | 55 | |
3193e8fd | 56 | struct workqueue_struct *batadv_event_workqueue; |
c6c8fea2 | 57 | |
ee11ad61 | 58 | static void batadv_recv_handler_init(void); |
ffa995e0 | 59 | |
ee11ad61 | 60 | static int __init batadv_init(void) |
c6c8fea2 | 61 | { |
3193e8fd | 62 | INIT_LIST_HEAD(&batadv_hardif_list); |
ee11ad61 | 63 | INIT_HLIST_HEAD(&batadv_algo_list); |
1c280471 | 64 | |
ee11ad61 | 65 | batadv_recv_handler_init(); |
ffa995e0 | 66 | |
81c524f7 | 67 | batadv_iv_init(); |
6c519bad | 68 | batadv_nc_init(); |
c6c8fea2 | 69 | |
3193e8fd | 70 | batadv_event_workqueue = create_singlethread_workqueue("bat_events"); |
c6c8fea2 | 71 | |
3193e8fd | 72 | if (!batadv_event_workqueue) |
c6c8fea2 SE |
73 | return -ENOMEM; |
74 | ||
9039dc7e | 75 | batadv_socket_init(); |
40a072d7 | 76 | batadv_debugfs_init(); |
c6c8fea2 | 77 | |
9563877e | 78 | register_netdevice_notifier(&batadv_hard_if_notifier); |
a4ac28c0 | 79 | rtnl_link_register(&batadv_link_ops); |
c6c8fea2 | 80 | |
86ceb360 | 81 | pr_info("B.A.T.M.A.N. advanced %s (compatibility version %i) loaded\n", |
42d0b044 | 82 | BATADV_SOURCE_VERSION, BATADV_COMPAT_VERSION); |
c6c8fea2 SE |
83 | |
84 | return 0; | |
85 | } | |
86 | ||
ee11ad61 | 87 | static void __exit batadv_exit(void) |
c6c8fea2 | 88 | { |
40a072d7 | 89 | batadv_debugfs_destroy(); |
a4ac28c0 | 90 | rtnl_link_unregister(&batadv_link_ops); |
9563877e SE |
91 | unregister_netdevice_notifier(&batadv_hard_if_notifier); |
92 | batadv_hardif_remove_interfaces(); | |
c6c8fea2 | 93 | |
3193e8fd SE |
94 | flush_workqueue(batadv_event_workqueue); |
95 | destroy_workqueue(batadv_event_workqueue); | |
96 | batadv_event_workqueue = NULL; | |
c6c8fea2 SE |
97 | |
98 | rcu_barrier(); | |
99 | } | |
100 | ||
3193e8fd | 101 | int batadv_mesh_init(struct net_device *soft_iface) |
c6c8fea2 | 102 | { |
56303d34 | 103 | struct batadv_priv *bat_priv = netdev_priv(soft_iface); |
5346c35e | 104 | int ret; |
c6c8fea2 | 105 | |
c6c8fea2 SE |
106 | spin_lock_init(&bat_priv->forw_bat_list_lock); |
107 | spin_lock_init(&bat_priv->forw_bcast_list_lock); | |
807736f6 SE |
108 | spin_lock_init(&bat_priv->tt.changes_list_lock); |
109 | spin_lock_init(&bat_priv->tt.req_list_lock); | |
110 | spin_lock_init(&bat_priv->tt.roam_list_lock); | |
111 | spin_lock_init(&bat_priv->tt.last_changeset_lock); | |
a70a9aa9 | 112 | spin_lock_init(&bat_priv->tt.commit_lock); |
807736f6 | 113 | spin_lock_init(&bat_priv->gw.list_lock); |
ef261577 ML |
114 | spin_lock_init(&bat_priv->tvlv.container_list_lock); |
115 | spin_lock_init(&bat_priv->tvlv.handler_list_lock); | |
5d2c05b2 | 116 | spin_lock_init(&bat_priv->softif_vlan_list_lock); |
c6c8fea2 SE |
117 | |
118 | INIT_HLIST_HEAD(&bat_priv->forw_bat_list); | |
119 | INIT_HLIST_HEAD(&bat_priv->forw_bcast_list); | |
807736f6 SE |
120 | INIT_HLIST_HEAD(&bat_priv->gw.list); |
121 | INIT_LIST_HEAD(&bat_priv->tt.changes_list); | |
122 | INIT_LIST_HEAD(&bat_priv->tt.req_list); | |
123 | INIT_LIST_HEAD(&bat_priv->tt.roam_list); | |
c5caf4ef LL |
124 | #ifdef CONFIG_BATMAN_ADV_MCAST |
125 | INIT_HLIST_HEAD(&bat_priv->mcast.mla_list); | |
126 | #endif | |
ef261577 ML |
127 | INIT_HLIST_HEAD(&bat_priv->tvlv.container_list); |
128 | INIT_HLIST_HEAD(&bat_priv->tvlv.handler_list); | |
5d2c05b2 | 129 | INIT_HLIST_HEAD(&bat_priv->softif_vlan_list); |
c6c8fea2 | 130 | |
7d211efc | 131 | ret = batadv_originator_init(bat_priv); |
5346c35e | 132 | if (ret < 0) |
c6c8fea2 SE |
133 | goto err; |
134 | ||
08c36d3e | 135 | ret = batadv_tt_init(bat_priv); |
5346c35e | 136 | if (ret < 0) |
c6c8fea2 SE |
137 | goto err; |
138 | ||
08adf151 | 139 | ret = batadv_bla_init(bat_priv); |
5346c35e | 140 | if (ret < 0) |
23721387 SW |
141 | goto err; |
142 | ||
2f1dfbe1 AQ |
143 | ret = batadv_dat_init(bat_priv); |
144 | if (ret < 0) | |
145 | goto err; | |
146 | ||
6c519bad | 147 | ret = batadv_nc_mesh_init(bat_priv); |
d353d8d4 MH |
148 | if (ret < 0) |
149 | goto err; | |
150 | ||
414254e3 | 151 | batadv_gw_init(bat_priv); |
60432d75 | 152 | batadv_mcast_init(bat_priv); |
414254e3 | 153 | |
807736f6 | 154 | atomic_set(&bat_priv->gw.reselect, 0); |
39c75a51 | 155 | atomic_set(&bat_priv->mesh_state, BATADV_MESH_ACTIVE); |
5346c35e SE |
156 | |
157 | return 0; | |
c6c8fea2 SE |
158 | |
159 | err: | |
3193e8fd | 160 | batadv_mesh_free(soft_iface); |
5346c35e | 161 | return ret; |
c6c8fea2 SE |
162 | } |
163 | ||
3193e8fd | 164 | void batadv_mesh_free(struct net_device *soft_iface) |
c6c8fea2 | 165 | { |
56303d34 | 166 | struct batadv_priv *bat_priv = netdev_priv(soft_iface); |
c6c8fea2 | 167 | |
39c75a51 | 168 | atomic_set(&bat_priv->mesh_state, BATADV_MESH_DEACTIVATING); |
c6c8fea2 | 169 | |
9455e34c | 170 | batadv_purge_outstanding_packets(bat_priv, NULL); |
c6c8fea2 | 171 | |
7cf06bc6 | 172 | batadv_gw_node_purge(bat_priv); |
6c519bad | 173 | batadv_nc_mesh_free(bat_priv); |
a4361860 AQ |
174 | batadv_dat_free(bat_priv); |
175 | batadv_bla_free(bat_priv); | |
c6c8fea2 | 176 | |
c5caf4ef LL |
177 | batadv_mcast_free(bat_priv); |
178 | ||
a4361860 AQ |
179 | /* Free the TT and the originator tables only after having terminated |
180 | * all the other depending components which may use these structures for | |
181 | * their purposes. | |
182 | */ | |
08c36d3e | 183 | batadv_tt_free(bat_priv); |
c6c8fea2 | 184 | |
a4361860 AQ |
185 | /* Since the originator table clean up routine is accessing the TT |
186 | * tables as well, it has to be invoked after the TT tables have been | |
187 | * freed and marked as empty. This ensures that no cleanup RCU callbacks | |
188 | * accessing the TT data are scheduled for later execution. | |
189 | */ | |
190 | batadv_originator_free(bat_priv); | |
2f1dfbe1 | 191 | |
414254e3 ML |
192 | batadv_gw_free(bat_priv); |
193 | ||
f8214865 | 194 | free_percpu(bat_priv->bat_counters); |
f69ae770 | 195 | bat_priv->bat_counters = NULL; |
f8214865 | 196 | |
39c75a51 | 197 | atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE); |
c6c8fea2 SE |
198 | } |
199 | ||
6e0895c2 DM |
200 | /** |
201 | * batadv_is_my_mac - check if the given mac address belongs to any of the real | |
202 | * interfaces in the current mesh | |
203 | * @bat_priv: the bat priv with all the soft interface information | |
204 | * @addr: the address to check | |
205 | */ | |
fe8a93b9 | 206 | int batadv_is_my_mac(struct batadv_priv *bat_priv, const uint8_t *addr) |
c6c8fea2 | 207 | { |
56303d34 | 208 | const struct batadv_hard_iface *hard_iface; |
c6c8fea2 SE |
209 | |
210 | rcu_read_lock(); | |
3193e8fd | 211 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e9a4f295 | 212 | if (hard_iface->if_status != BATADV_IF_ACTIVE) |
c6c8fea2 SE |
213 | continue; |
214 | ||
fe8a93b9 AQ |
215 | if (hard_iface->soft_iface != bat_priv->soft_iface) |
216 | continue; | |
217 | ||
1eda58bf | 218 | if (batadv_compare_eth(hard_iface->net_dev->dev_addr, addr)) { |
c6c8fea2 SE |
219 | rcu_read_unlock(); |
220 | return 1; | |
221 | } | |
222 | } | |
223 | rcu_read_unlock(); | |
224 | return 0; | |
c6c8fea2 SE |
225 | } |
226 | ||
30da63a6 ML |
227 | /** |
228 | * batadv_seq_print_text_primary_if_get - called from debugfs table printing | |
229 | * function that requires the primary interface | |
230 | * @seq: debugfs table seq_file struct | |
231 | * | |
232 | * Returns primary interface if found or NULL otherwise. | |
233 | */ | |
234 | struct batadv_hard_iface * | |
235 | batadv_seq_print_text_primary_if_get(struct seq_file *seq) | |
236 | { | |
237 | struct net_device *net_dev = (struct net_device *)seq->private; | |
238 | struct batadv_priv *bat_priv = netdev_priv(net_dev); | |
239 | struct batadv_hard_iface *primary_if; | |
240 | ||
241 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
242 | ||
243 | if (!primary_if) { | |
244 | seq_printf(seq, | |
245 | "BATMAN mesh %s disabled - please specify interfaces to enable it\n", | |
246 | net_dev->name); | |
247 | goto out; | |
248 | } | |
249 | ||
250 | if (primary_if->if_status == BATADV_IF_ACTIVE) | |
251 | goto out; | |
252 | ||
253 | seq_printf(seq, | |
254 | "BATMAN mesh %s disabled - primary interface not active\n", | |
255 | net_dev->name); | |
256 | batadv_hardif_free_ref(primary_if); | |
257 | primary_if = NULL; | |
258 | ||
259 | out: | |
260 | return primary_if; | |
261 | } | |
262 | ||
411d6ed9 ML |
263 | /** |
264 | * batadv_max_header_len - calculate maximum encapsulation overhead for a | |
265 | * payload packet | |
266 | * | |
267 | * Return the maximum encapsulation overhead in bytes. | |
268 | */ | |
269 | int batadv_max_header_len(void) | |
270 | { | |
271 | int header_len = 0; | |
272 | ||
273 | header_len = max_t(int, header_len, | |
274 | sizeof(struct batadv_unicast_packet)); | |
275 | header_len = max_t(int, header_len, | |
276 | sizeof(struct batadv_unicast_4addr_packet)); | |
277 | header_len = max_t(int, header_len, | |
278 | sizeof(struct batadv_bcast_packet)); | |
279 | ||
280 | #ifdef CONFIG_BATMAN_ADV_NC | |
281 | header_len = max_t(int, header_len, | |
282 | sizeof(struct batadv_coded_packet)); | |
283 | #endif | |
284 | ||
1df0cbd5 | 285 | return header_len + ETH_HLEN; |
411d6ed9 ML |
286 | } |
287 | ||
c54f38c9 SW |
288 | /** |
289 | * batadv_skb_set_priority - sets skb priority according to packet content | |
290 | * @skb: the packet to be sent | |
291 | * @offset: offset to the packet content | |
292 | * | |
293 | * This function sets a value between 256 and 263 (802.1d priority), which | |
294 | * can be interpreted by the cfg80211 or other drivers. | |
295 | */ | |
296 | void batadv_skb_set_priority(struct sk_buff *skb, int offset) | |
297 | { | |
298 | struct iphdr ip_hdr_tmp, *ip_hdr; | |
299 | struct ipv6hdr ip6_hdr_tmp, *ip6_hdr; | |
300 | struct ethhdr ethhdr_tmp, *ethhdr; | |
301 | struct vlan_ethhdr *vhdr, vhdr_tmp; | |
302 | u32 prio; | |
303 | ||
304 | /* already set, do nothing */ | |
305 | if (skb->priority >= 256 && skb->priority <= 263) | |
306 | return; | |
307 | ||
308 | ethhdr = skb_header_pointer(skb, offset, sizeof(*ethhdr), ðhdr_tmp); | |
309 | if (!ethhdr) | |
310 | return; | |
311 | ||
312 | switch (ethhdr->h_proto) { | |
313 | case htons(ETH_P_8021Q): | |
314 | vhdr = skb_header_pointer(skb, offset + sizeof(*vhdr), | |
315 | sizeof(*vhdr), &vhdr_tmp); | |
316 | if (!vhdr) | |
317 | return; | |
318 | prio = ntohs(vhdr->h_vlan_TCI) & VLAN_PRIO_MASK; | |
319 | prio = prio >> VLAN_PRIO_SHIFT; | |
320 | break; | |
321 | case htons(ETH_P_IP): | |
322 | ip_hdr = skb_header_pointer(skb, offset + sizeof(*ethhdr), | |
323 | sizeof(*ip_hdr), &ip_hdr_tmp); | |
324 | if (!ip_hdr) | |
325 | return; | |
326 | prio = (ipv4_get_dsfield(ip_hdr) & 0xfc) >> 5; | |
327 | break; | |
328 | case htons(ETH_P_IPV6): | |
329 | ip6_hdr = skb_header_pointer(skb, offset + sizeof(*ethhdr), | |
330 | sizeof(*ip6_hdr), &ip6_hdr_tmp); | |
331 | if (!ip6_hdr) | |
332 | return; | |
333 | prio = (ipv6_get_dsfield(ip6_hdr) & 0xfc) >> 5; | |
334 | break; | |
335 | default: | |
336 | return; | |
337 | } | |
338 | ||
339 | skb->priority = prio + 256; | |
340 | } | |
341 | ||
ee11ad61 | 342 | static int batadv_recv_unhandled_packet(struct sk_buff *skb, |
56303d34 | 343 | struct batadv_hard_iface *recv_if) |
ffa995e0 ML |
344 | { |
345 | return NET_RX_DROP; | |
346 | } | |
347 | ||
348 | /* incoming packets with the batman ethertype received on any active hard | |
349 | * interface | |
350 | */ | |
3193e8fd SE |
351 | int batadv_batman_skb_recv(struct sk_buff *skb, struct net_device *dev, |
352 | struct packet_type *ptype, | |
353 | struct net_device *orig_dev) | |
ffa995e0 | 354 | { |
56303d34 | 355 | struct batadv_priv *bat_priv; |
96412690 | 356 | struct batadv_ogm_packet *batadv_ogm_packet; |
56303d34 | 357 | struct batadv_hard_iface *hard_iface; |
ffa995e0 ML |
358 | uint8_t idx; |
359 | int ret; | |
360 | ||
56303d34 SE |
361 | hard_iface = container_of(ptype, struct batadv_hard_iface, |
362 | batman_adv_ptype); | |
ffa995e0 ML |
363 | skb = skb_share_check(skb, GFP_ATOMIC); |
364 | ||
365 | /* skb was released by skb_share_check() */ | |
366 | if (!skb) | |
367 | goto err_out; | |
368 | ||
369 | /* packet should hold at least type and version */ | |
370 | if (unlikely(!pskb_may_pull(skb, 2))) | |
371 | goto err_free; | |
372 | ||
373 | /* expect a valid ethernet header here. */ | |
374 | if (unlikely(skb->mac_len != ETH_HLEN || !skb_mac_header(skb))) | |
375 | goto err_free; | |
376 | ||
377 | if (!hard_iface->soft_iface) | |
378 | goto err_free; | |
379 | ||
380 | bat_priv = netdev_priv(hard_iface->soft_iface); | |
381 | ||
39c75a51 | 382 | if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) |
ffa995e0 ML |
383 | goto err_free; |
384 | ||
385 | /* discard frames on not active interfaces */ | |
e9a4f295 | 386 | if (hard_iface->if_status != BATADV_IF_ACTIVE) |
ffa995e0 ML |
387 | goto err_free; |
388 | ||
96412690 | 389 | batadv_ogm_packet = (struct batadv_ogm_packet *)skb->data; |
ffa995e0 | 390 | |
a40d9b07 | 391 | if (batadv_ogm_packet->version != BATADV_COMPAT_VERSION) { |
39c75a51 | 392 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 393 | "Drop packet: incompatible batman version (%i)\n", |
a40d9b07 | 394 | batadv_ogm_packet->version); |
ffa995e0 ML |
395 | goto err_free; |
396 | } | |
397 | ||
398 | /* all receive handlers return whether they received or reused | |
399 | * the supplied skb. if not, we have to free the skb. | |
400 | */ | |
a40d9b07 | 401 | idx = batadv_ogm_packet->packet_type; |
ee11ad61 | 402 | ret = (*batadv_rx_handler[idx])(skb, hard_iface); |
ffa995e0 ML |
403 | |
404 | if (ret == NET_RX_DROP) | |
405 | kfree_skb(skb); | |
406 | ||
407 | /* return NET_RX_SUCCESS in any case as we | |
408 | * most probably dropped the packet for | |
409 | * routing-logical reasons. | |
410 | */ | |
411 | return NET_RX_SUCCESS; | |
412 | ||
413 | err_free: | |
414 | kfree_skb(skb); | |
415 | err_out: | |
416 | return NET_RX_DROP; | |
417 | } | |
418 | ||
ee11ad61 | 419 | static void batadv_recv_handler_init(void) |
ffa995e0 ML |
420 | { |
421 | int i; | |
422 | ||
ee11ad61 SE |
423 | for (i = 0; i < ARRAY_SIZE(batadv_rx_handler); i++) |
424 | batadv_rx_handler[i] = batadv_recv_unhandled_packet; | |
ffa995e0 | 425 | |
a1f1ac5c SW |
426 | for (i = BATADV_UNICAST_MIN; i <= BATADV_UNICAST_MAX; i++) |
427 | batadv_rx_handler[i] = batadv_recv_unhandled_unicast_packet; | |
428 | ||
031ace8d SW |
429 | /* compile time checks for sizes */ |
430 | BUILD_BUG_ON(sizeof(struct batadv_bla_claim_dst) != 6); | |
431 | BUILD_BUG_ON(sizeof(struct batadv_ogm_packet) != 24); | |
432 | BUILD_BUG_ON(sizeof(struct batadv_icmp_header) != 20); | |
433 | BUILD_BUG_ON(sizeof(struct batadv_icmp_packet) != 20); | |
434 | BUILD_BUG_ON(sizeof(struct batadv_icmp_packet_rr) != 116); | |
435 | BUILD_BUG_ON(sizeof(struct batadv_unicast_packet) != 10); | |
436 | BUILD_BUG_ON(sizeof(struct batadv_unicast_4addr_packet) != 18); | |
437 | BUILD_BUG_ON(sizeof(struct batadv_frag_packet) != 20); | |
438 | BUILD_BUG_ON(sizeof(struct batadv_bcast_packet) != 14); | |
439 | BUILD_BUG_ON(sizeof(struct batadv_coded_packet) != 46); | |
440 | BUILD_BUG_ON(sizeof(struct batadv_unicast_tvlv_packet) != 20); | |
441 | BUILD_BUG_ON(sizeof(struct batadv_tvlv_hdr) != 4); | |
442 | BUILD_BUG_ON(sizeof(struct batadv_tvlv_gateway_data) != 8); | |
443 | BUILD_BUG_ON(sizeof(struct batadv_tvlv_tt_vlan_data) != 8); | |
444 | BUILD_BUG_ON(sizeof(struct batadv_tvlv_tt_change) != 12); | |
445 | BUILD_BUG_ON(sizeof(struct batadv_tvlv_roam_adv) != 8); | |
80067c83 | 446 | |
a1f1ac5c SW |
447 | /* broadcast packet */ |
448 | batadv_rx_handler[BATADV_BCAST] = batadv_recv_bcast_packet; | |
449 | ||
450 | /* unicast packets ... */ | |
7cdcf6dd AQ |
451 | /* unicast with 4 addresses packet */ |
452 | batadv_rx_handler[BATADV_UNICAST_4ADDR] = batadv_recv_unicast_packet; | |
ffa995e0 | 453 | /* unicast packet */ |
acd34afa | 454 | batadv_rx_handler[BATADV_UNICAST] = batadv_recv_unicast_packet; |
ef261577 ML |
455 | /* unicast tvlv packet */ |
456 | batadv_rx_handler[BATADV_UNICAST_TVLV] = batadv_recv_unicast_tvlv; | |
a1f1ac5c SW |
457 | /* batman icmp packet */ |
458 | batadv_rx_handler[BATADV_ICMP] = batadv_recv_icmp_packet; | |
610bfc6b MH |
459 | /* Fragmented packets */ |
460 | batadv_rx_handler[BATADV_UNICAST_FRAG] = batadv_recv_frag_packet; | |
ffa995e0 ML |
461 | } |
462 | ||
56303d34 SE |
463 | int |
464 | batadv_recv_handler_register(uint8_t packet_type, | |
465 | int (*recv_handler)(struct sk_buff *, | |
466 | struct batadv_hard_iface *)) | |
ffa995e0 | 467 | { |
a1f1ac5c SW |
468 | int (*curr)(struct sk_buff *, |
469 | struct batadv_hard_iface *); | |
470 | curr = batadv_rx_handler[packet_type]; | |
471 | ||
472 | if ((curr != batadv_recv_unhandled_packet) && | |
473 | (curr != batadv_recv_unhandled_unicast_packet)) | |
ffa995e0 ML |
474 | return -EBUSY; |
475 | ||
ee11ad61 | 476 | batadv_rx_handler[packet_type] = recv_handler; |
ffa995e0 ML |
477 | return 0; |
478 | } | |
479 | ||
3193e8fd | 480 | void batadv_recv_handler_unregister(uint8_t packet_type) |
ffa995e0 | 481 | { |
ee11ad61 | 482 | batadv_rx_handler[packet_type] = batadv_recv_unhandled_packet; |
ffa995e0 ML |
483 | } |
484 | ||
56303d34 | 485 | static struct batadv_algo_ops *batadv_algo_get(char *name) |
1c280471 | 486 | { |
56303d34 | 487 | struct batadv_algo_ops *bat_algo_ops = NULL, *bat_algo_ops_tmp; |
1c280471 | 488 | |
b67bfe0d | 489 | hlist_for_each_entry(bat_algo_ops_tmp, &batadv_algo_list, list) { |
1c280471 ML |
490 | if (strcmp(bat_algo_ops_tmp->name, name) != 0) |
491 | continue; | |
492 | ||
493 | bat_algo_ops = bat_algo_ops_tmp; | |
494 | break; | |
495 | } | |
496 | ||
497 | return bat_algo_ops; | |
498 | } | |
499 | ||
56303d34 | 500 | int batadv_algo_register(struct batadv_algo_ops *bat_algo_ops) |
1c280471 | 501 | { |
56303d34 | 502 | struct batadv_algo_ops *bat_algo_ops_tmp; |
5346c35e | 503 | int ret; |
1c280471 | 504 | |
ee11ad61 | 505 | bat_algo_ops_tmp = batadv_algo_get(bat_algo_ops->name); |
1c280471 | 506 | if (bat_algo_ops_tmp) { |
86ceb360 SE |
507 | pr_info("Trying to register already registered routing algorithm: %s\n", |
508 | bat_algo_ops->name); | |
5346c35e | 509 | ret = -EEXIST; |
1c280471 ML |
510 | goto out; |
511 | } | |
512 | ||
01c4224b | 513 | /* all algorithms must implement all ops (for now) */ |
c2aca022 | 514 | if (!bat_algo_ops->bat_iface_enable || |
00a50076 | 515 | !bat_algo_ops->bat_iface_disable || |
c3229398 | 516 | !bat_algo_ops->bat_iface_update_mac || |
cd8b78e7 | 517 | !bat_algo_ops->bat_primary_iface_set || |
01c4224b | 518 | !bat_algo_ops->bat_ogm_schedule || |
a3285a8f | 519 | !bat_algo_ops->bat_ogm_emit || |
c43c981e AQ |
520 | !bat_algo_ops->bat_neigh_cmp || |
521 | !bat_algo_ops->bat_neigh_is_equiv_or_better) { | |
01c4224b ML |
522 | pr_info("Routing algo '%s' does not implement required ops\n", |
523 | bat_algo_ops->name); | |
5346c35e | 524 | ret = -EINVAL; |
01c4224b ML |
525 | goto out; |
526 | } | |
527 | ||
1c280471 | 528 | INIT_HLIST_NODE(&bat_algo_ops->list); |
ee11ad61 | 529 | hlist_add_head(&bat_algo_ops->list, &batadv_algo_list); |
1c280471 ML |
530 | ret = 0; |
531 | ||
532 | out: | |
533 | return ret; | |
534 | } | |
535 | ||
56303d34 | 536 | int batadv_algo_select(struct batadv_priv *bat_priv, char *name) |
1c280471 | 537 | { |
56303d34 | 538 | struct batadv_algo_ops *bat_algo_ops; |
5346c35e | 539 | int ret = -EINVAL; |
1c280471 | 540 | |
ee11ad61 | 541 | bat_algo_ops = batadv_algo_get(name); |
1c280471 ML |
542 | if (!bat_algo_ops) |
543 | goto out; | |
544 | ||
545 | bat_priv->bat_algo_ops = bat_algo_ops; | |
546 | ret = 0; | |
547 | ||
548 | out: | |
549 | return ret; | |
550 | } | |
551 | ||
3193e8fd | 552 | int batadv_algo_seq_print_text(struct seq_file *seq, void *offset) |
1c280471 | 553 | { |
56303d34 | 554 | struct batadv_algo_ops *bat_algo_ops; |
1c280471 | 555 | |
0c814653 | 556 | seq_puts(seq, "Available routing algorithms:\n"); |
1c280471 | 557 | |
b67bfe0d | 558 | hlist_for_each_entry(bat_algo_ops, &batadv_algo_list, list) { |
1c280471 ML |
559 | seq_printf(seq, "%s\n", bat_algo_ops->name); |
560 | } | |
561 | ||
562 | return 0; | |
563 | } | |
564 | ||
95a066d8 SE |
565 | /** |
566 | * batadv_skb_crc32 - calculate CRC32 of the whole packet and skip bytes in | |
567 | * the header | |
568 | * @skb: skb pointing to fragmented socket buffers | |
569 | * @payload_ptr: Pointer to position inside the head buffer of the skb | |
570 | * marking the start of the data to be CRC'ed | |
571 | * | |
572 | * payload_ptr must always point to an address in the skb head buffer and not to | |
573 | * a fragment. | |
574 | */ | |
575 | __be32 batadv_skb_crc32(struct sk_buff *skb, u8 *payload_ptr) | |
576 | { | |
577 | u32 crc = 0; | |
578 | unsigned int from; | |
579 | unsigned int to = skb->len; | |
580 | struct skb_seq_state st; | |
581 | const u8 *data; | |
582 | unsigned int len; | |
583 | unsigned int consumed = 0; | |
584 | ||
585 | from = (unsigned int)(payload_ptr - skb->data); | |
586 | ||
587 | skb_prepare_seq_read(skb, from, to, &st); | |
588 | while ((len = skb_seq_read(consumed, &data, &st)) != 0) { | |
589 | crc = crc32c(crc, data, len); | |
590 | consumed += len; | |
591 | } | |
95a066d8 SE |
592 | |
593 | return htonl(crc); | |
594 | } | |
595 | ||
ef261577 ML |
596 | /** |
597 | * batadv_tvlv_handler_free_ref - decrement the tvlv handler refcounter and | |
598 | * possibly free it | |
599 | * @tvlv_handler: the tvlv handler to free | |
600 | */ | |
601 | static void | |
602 | batadv_tvlv_handler_free_ref(struct batadv_tvlv_handler *tvlv_handler) | |
603 | { | |
604 | if (atomic_dec_and_test(&tvlv_handler->refcount)) | |
605 | kfree_rcu(tvlv_handler, rcu); | |
606 | } | |
607 | ||
608 | /** | |
609 | * batadv_tvlv_handler_get - retrieve tvlv handler from the tvlv handler list | |
610 | * based on the provided type and version (both need to match) | |
611 | * @bat_priv: the bat priv with all the soft interface information | |
612 | * @type: tvlv handler type to look for | |
613 | * @version: tvlv handler version to look for | |
614 | * | |
615 | * Returns tvlv handler if found or NULL otherwise. | |
616 | */ | |
617 | static struct batadv_tvlv_handler | |
618 | *batadv_tvlv_handler_get(struct batadv_priv *bat_priv, | |
619 | uint8_t type, uint8_t version) | |
620 | { | |
621 | struct batadv_tvlv_handler *tvlv_handler_tmp, *tvlv_handler = NULL; | |
622 | ||
623 | rcu_read_lock(); | |
624 | hlist_for_each_entry_rcu(tvlv_handler_tmp, | |
625 | &bat_priv->tvlv.handler_list, list) { | |
626 | if (tvlv_handler_tmp->type != type) | |
627 | continue; | |
628 | ||
629 | if (tvlv_handler_tmp->version != version) | |
630 | continue; | |
631 | ||
632 | if (!atomic_inc_not_zero(&tvlv_handler_tmp->refcount)) | |
633 | continue; | |
634 | ||
635 | tvlv_handler = tvlv_handler_tmp; | |
636 | break; | |
637 | } | |
638 | rcu_read_unlock(); | |
639 | ||
640 | return tvlv_handler; | |
641 | } | |
642 | ||
643 | /** | |
644 | * batadv_tvlv_container_free_ref - decrement the tvlv container refcounter and | |
645 | * possibly free it | |
646 | * @tvlv_handler: the tvlv container to free | |
647 | */ | |
648 | static void batadv_tvlv_container_free_ref(struct batadv_tvlv_container *tvlv) | |
649 | { | |
650 | if (atomic_dec_and_test(&tvlv->refcount)) | |
651 | kfree(tvlv); | |
652 | } | |
653 | ||
654 | /** | |
655 | * batadv_tvlv_container_get - retrieve tvlv container from the tvlv container | |
656 | * list based on the provided type and version (both need to match) | |
657 | * @bat_priv: the bat priv with all the soft interface information | |
658 | * @type: tvlv container type to look for | |
659 | * @version: tvlv container version to look for | |
660 | * | |
661 | * Has to be called with the appropriate locks being acquired | |
662 | * (tvlv.container_list_lock). | |
663 | * | |
664 | * Returns tvlv container if found or NULL otherwise. | |
665 | */ | |
666 | static struct batadv_tvlv_container | |
667 | *batadv_tvlv_container_get(struct batadv_priv *bat_priv, | |
668 | uint8_t type, uint8_t version) | |
669 | { | |
670 | struct batadv_tvlv_container *tvlv_tmp, *tvlv = NULL; | |
671 | ||
672 | hlist_for_each_entry(tvlv_tmp, &bat_priv->tvlv.container_list, list) { | |
673 | if (tvlv_tmp->tvlv_hdr.type != type) | |
674 | continue; | |
675 | ||
676 | if (tvlv_tmp->tvlv_hdr.version != version) | |
677 | continue; | |
678 | ||
679 | if (!atomic_inc_not_zero(&tvlv_tmp->refcount)) | |
680 | continue; | |
681 | ||
682 | tvlv = tvlv_tmp; | |
683 | break; | |
684 | } | |
685 | ||
686 | return tvlv; | |
687 | } | |
688 | ||
689 | /** | |
690 | * batadv_tvlv_container_list_size - calculate the size of the tvlv container | |
691 | * list entries | |
692 | * @bat_priv: the bat priv with all the soft interface information | |
693 | * | |
694 | * Has to be called with the appropriate locks being acquired | |
695 | * (tvlv.container_list_lock). | |
696 | * | |
697 | * Returns size of all currently registered tvlv containers in bytes. | |
698 | */ | |
699 | static uint16_t batadv_tvlv_container_list_size(struct batadv_priv *bat_priv) | |
700 | { | |
701 | struct batadv_tvlv_container *tvlv; | |
702 | uint16_t tvlv_len = 0; | |
703 | ||
704 | hlist_for_each_entry(tvlv, &bat_priv->tvlv.container_list, list) { | |
705 | tvlv_len += sizeof(struct batadv_tvlv_hdr); | |
706 | tvlv_len += ntohs(tvlv->tvlv_hdr.len); | |
707 | } | |
708 | ||
709 | return tvlv_len; | |
710 | } | |
711 | ||
712 | /** | |
713 | * batadv_tvlv_container_remove - remove tvlv container from the tvlv container | |
714 | * list | |
715 | * @tvlv: the to be removed tvlv container | |
716 | * | |
717 | * Has to be called with the appropriate locks being acquired | |
718 | * (tvlv.container_list_lock). | |
719 | */ | |
720 | static void batadv_tvlv_container_remove(struct batadv_tvlv_container *tvlv) | |
721 | { | |
722 | if (!tvlv) | |
723 | return; | |
724 | ||
725 | hlist_del(&tvlv->list); | |
726 | ||
727 | /* first call to decrement the counter, second call to free */ | |
728 | batadv_tvlv_container_free_ref(tvlv); | |
729 | batadv_tvlv_container_free_ref(tvlv); | |
730 | } | |
731 | ||
732 | /** | |
733 | * batadv_tvlv_container_unregister - unregister tvlv container based on the | |
734 | * provided type and version (both need to match) | |
735 | * @bat_priv: the bat priv with all the soft interface information | |
736 | * @type: tvlv container type to unregister | |
737 | * @version: tvlv container type to unregister | |
738 | */ | |
739 | void batadv_tvlv_container_unregister(struct batadv_priv *bat_priv, | |
740 | uint8_t type, uint8_t version) | |
741 | { | |
742 | struct batadv_tvlv_container *tvlv; | |
743 | ||
744 | spin_lock_bh(&bat_priv->tvlv.container_list_lock); | |
745 | tvlv = batadv_tvlv_container_get(bat_priv, type, version); | |
746 | batadv_tvlv_container_remove(tvlv); | |
747 | spin_unlock_bh(&bat_priv->tvlv.container_list_lock); | |
748 | } | |
749 | ||
750 | /** | |
751 | * batadv_tvlv_container_register - register tvlv type, version and content | |
752 | * to be propagated with each (primary interface) OGM | |
753 | * @bat_priv: the bat priv with all the soft interface information | |
754 | * @type: tvlv container type | |
755 | * @version: tvlv container version | |
756 | * @tvlv_value: tvlv container content | |
757 | * @tvlv_value_len: tvlv container content length | |
758 | * | |
759 | * If a container of the same type and version was already registered the new | |
760 | * content is going to replace the old one. | |
761 | */ | |
762 | void batadv_tvlv_container_register(struct batadv_priv *bat_priv, | |
763 | uint8_t type, uint8_t version, | |
764 | void *tvlv_value, uint16_t tvlv_value_len) | |
765 | { | |
766 | struct batadv_tvlv_container *tvlv_old, *tvlv_new; | |
767 | ||
768 | if (!tvlv_value) | |
769 | tvlv_value_len = 0; | |
770 | ||
771 | tvlv_new = kzalloc(sizeof(*tvlv_new) + tvlv_value_len, GFP_ATOMIC); | |
772 | if (!tvlv_new) | |
773 | return; | |
774 | ||
775 | tvlv_new->tvlv_hdr.version = version; | |
776 | tvlv_new->tvlv_hdr.type = type; | |
777 | tvlv_new->tvlv_hdr.len = htons(tvlv_value_len); | |
778 | ||
779 | memcpy(tvlv_new + 1, tvlv_value, ntohs(tvlv_new->tvlv_hdr.len)); | |
780 | INIT_HLIST_NODE(&tvlv_new->list); | |
781 | atomic_set(&tvlv_new->refcount, 1); | |
782 | ||
783 | spin_lock_bh(&bat_priv->tvlv.container_list_lock); | |
784 | tvlv_old = batadv_tvlv_container_get(bat_priv, type, version); | |
785 | batadv_tvlv_container_remove(tvlv_old); | |
786 | hlist_add_head(&tvlv_new->list, &bat_priv->tvlv.container_list); | |
787 | spin_unlock_bh(&bat_priv->tvlv.container_list_lock); | |
788 | } | |
789 | ||
790 | /** | |
791 | * batadv_tvlv_realloc_packet_buff - reallocate packet buffer to accomodate | |
792 | * requested packet size | |
793 | * @packet_buff: packet buffer | |
794 | * @packet_buff_len: packet buffer size | |
795 | * @packet_min_len: requested packet minimum size | |
796 | * @additional_packet_len: requested additional packet size on top of minimum | |
797 | * size | |
798 | * | |
799 | * Returns true of the packet buffer could be changed to the requested size, | |
800 | * false otherwise. | |
801 | */ | |
802 | static bool batadv_tvlv_realloc_packet_buff(unsigned char **packet_buff, | |
803 | int *packet_buff_len, | |
804 | int min_packet_len, | |
805 | int additional_packet_len) | |
806 | { | |
807 | unsigned char *new_buff; | |
808 | ||
809 | new_buff = kmalloc(min_packet_len + additional_packet_len, GFP_ATOMIC); | |
810 | ||
811 | /* keep old buffer if kmalloc should fail */ | |
812 | if (new_buff) { | |
813 | memcpy(new_buff, *packet_buff, min_packet_len); | |
814 | kfree(*packet_buff); | |
815 | *packet_buff = new_buff; | |
816 | *packet_buff_len = min_packet_len + additional_packet_len; | |
817 | return true; | |
818 | } | |
819 | ||
820 | return false; | |
821 | } | |
822 | ||
823 | /** | |
824 | * batadv_tvlv_container_ogm_append - append tvlv container content to given | |
825 | * OGM packet buffer | |
826 | * @bat_priv: the bat priv with all the soft interface information | |
827 | * @packet_buff: ogm packet buffer | |
828 | * @packet_buff_len: ogm packet buffer size including ogm header and tvlv | |
829 | * content | |
830 | * @packet_min_len: ogm header size to be preserved for the OGM itself | |
831 | * | |
832 | * The ogm packet might be enlarged or shrunk depending on the current size | |
833 | * and the size of the to-be-appended tvlv containers. | |
834 | * | |
835 | * Returns size of all appended tvlv containers in bytes. | |
836 | */ | |
837 | uint16_t batadv_tvlv_container_ogm_append(struct batadv_priv *bat_priv, | |
838 | unsigned char **packet_buff, | |
839 | int *packet_buff_len, | |
840 | int packet_min_len) | |
841 | { | |
842 | struct batadv_tvlv_container *tvlv; | |
843 | struct batadv_tvlv_hdr *tvlv_hdr; | |
844 | uint16_t tvlv_value_len; | |
845 | void *tvlv_value; | |
846 | bool ret; | |
847 | ||
848 | spin_lock_bh(&bat_priv->tvlv.container_list_lock); | |
849 | tvlv_value_len = batadv_tvlv_container_list_size(bat_priv); | |
850 | ||
851 | ret = batadv_tvlv_realloc_packet_buff(packet_buff, packet_buff_len, | |
852 | packet_min_len, tvlv_value_len); | |
853 | ||
854 | if (!ret) | |
855 | goto end; | |
856 | ||
857 | if (!tvlv_value_len) | |
858 | goto end; | |
859 | ||
860 | tvlv_value = (*packet_buff) + packet_min_len; | |
861 | ||
862 | hlist_for_each_entry(tvlv, &bat_priv->tvlv.container_list, list) { | |
863 | tvlv_hdr = tvlv_value; | |
864 | tvlv_hdr->type = tvlv->tvlv_hdr.type; | |
865 | tvlv_hdr->version = tvlv->tvlv_hdr.version; | |
866 | tvlv_hdr->len = tvlv->tvlv_hdr.len; | |
867 | tvlv_value = tvlv_hdr + 1; | |
868 | memcpy(tvlv_value, tvlv + 1, ntohs(tvlv->tvlv_hdr.len)); | |
869 | tvlv_value = (uint8_t *)tvlv_value + ntohs(tvlv->tvlv_hdr.len); | |
870 | } | |
871 | ||
872 | end: | |
873 | spin_unlock_bh(&bat_priv->tvlv.container_list_lock); | |
874 | return tvlv_value_len; | |
875 | } | |
876 | ||
877 | /** | |
878 | * batadv_tvlv_call_handler - parse the given tvlv buffer to call the | |
879 | * appropriate handlers | |
880 | * @bat_priv: the bat priv with all the soft interface information | |
881 | * @tvlv_handler: tvlv callback function handling the tvlv content | |
882 | * @ogm_source: flag indicating wether the tvlv is an ogm or a unicast packet | |
883 | * @orig_node: orig node emitting the ogm packet | |
884 | * @src: source mac address of the unicast packet | |
885 | * @dst: destination mac address of the unicast packet | |
886 | * @tvlv_value: tvlv content | |
887 | * @tvlv_value_len: tvlv content length | |
888 | * | |
889 | * Returns success if handler was not found or the return value of the handler | |
890 | * callback. | |
891 | */ | |
892 | static int batadv_tvlv_call_handler(struct batadv_priv *bat_priv, | |
893 | struct batadv_tvlv_handler *tvlv_handler, | |
894 | bool ogm_source, | |
895 | struct batadv_orig_node *orig_node, | |
896 | uint8_t *src, uint8_t *dst, | |
897 | void *tvlv_value, uint16_t tvlv_value_len) | |
898 | { | |
899 | if (!tvlv_handler) | |
900 | return NET_RX_SUCCESS; | |
901 | ||
902 | if (ogm_source) { | |
903 | if (!tvlv_handler->ogm_handler) | |
904 | return NET_RX_SUCCESS; | |
905 | ||
906 | if (!orig_node) | |
907 | return NET_RX_SUCCESS; | |
908 | ||
909 | tvlv_handler->ogm_handler(bat_priv, orig_node, | |
910 | BATADV_NO_FLAGS, | |
911 | tvlv_value, tvlv_value_len); | |
912 | tvlv_handler->flags |= BATADV_TVLV_HANDLER_OGM_CALLED; | |
913 | } else { | |
914 | if (!src) | |
915 | return NET_RX_SUCCESS; | |
916 | ||
917 | if (!dst) | |
918 | return NET_RX_SUCCESS; | |
919 | ||
920 | if (!tvlv_handler->unicast_handler) | |
921 | return NET_RX_SUCCESS; | |
922 | ||
923 | return tvlv_handler->unicast_handler(bat_priv, src, | |
924 | dst, tvlv_value, | |
925 | tvlv_value_len); | |
926 | } | |
927 | ||
928 | return NET_RX_SUCCESS; | |
929 | } | |
930 | ||
931 | /** | |
932 | * batadv_tvlv_containers_process - parse the given tvlv buffer to call the | |
933 | * appropriate handlers | |
934 | * @bat_priv: the bat priv with all the soft interface information | |
935 | * @ogm_source: flag indicating wether the tvlv is an ogm or a unicast packet | |
936 | * @orig_node: orig node emitting the ogm packet | |
937 | * @src: source mac address of the unicast packet | |
938 | * @dst: destination mac address of the unicast packet | |
939 | * @tvlv_value: tvlv content | |
940 | * @tvlv_value_len: tvlv content length | |
941 | * | |
942 | * Returns success when processing an OGM or the return value of all called | |
943 | * handler callbacks. | |
944 | */ | |
945 | int batadv_tvlv_containers_process(struct batadv_priv *bat_priv, | |
946 | bool ogm_source, | |
947 | struct batadv_orig_node *orig_node, | |
948 | uint8_t *src, uint8_t *dst, | |
949 | void *tvlv_value, uint16_t tvlv_value_len) | |
950 | { | |
951 | struct batadv_tvlv_handler *tvlv_handler; | |
952 | struct batadv_tvlv_hdr *tvlv_hdr; | |
953 | uint16_t tvlv_value_cont_len; | |
954 | uint8_t cifnotfound = BATADV_TVLV_HANDLER_OGM_CIFNOTFND; | |
955 | int ret = NET_RX_SUCCESS; | |
956 | ||
957 | while (tvlv_value_len >= sizeof(*tvlv_hdr)) { | |
958 | tvlv_hdr = tvlv_value; | |
959 | tvlv_value_cont_len = ntohs(tvlv_hdr->len); | |
960 | tvlv_value = tvlv_hdr + 1; | |
961 | tvlv_value_len -= sizeof(*tvlv_hdr); | |
962 | ||
963 | if (tvlv_value_cont_len > tvlv_value_len) | |
964 | break; | |
965 | ||
966 | tvlv_handler = batadv_tvlv_handler_get(bat_priv, | |
967 | tvlv_hdr->type, | |
968 | tvlv_hdr->version); | |
969 | ||
970 | ret |= batadv_tvlv_call_handler(bat_priv, tvlv_handler, | |
971 | ogm_source, orig_node, | |
972 | src, dst, tvlv_value, | |
973 | tvlv_value_cont_len); | |
974 | if (tvlv_handler) | |
975 | batadv_tvlv_handler_free_ref(tvlv_handler); | |
976 | tvlv_value = (uint8_t *)tvlv_value + tvlv_value_cont_len; | |
977 | tvlv_value_len -= tvlv_value_cont_len; | |
978 | } | |
979 | ||
980 | if (!ogm_source) | |
981 | return ret; | |
982 | ||
983 | rcu_read_lock(); | |
984 | hlist_for_each_entry_rcu(tvlv_handler, | |
985 | &bat_priv->tvlv.handler_list, list) { | |
986 | if ((tvlv_handler->flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND) && | |
987 | !(tvlv_handler->flags & BATADV_TVLV_HANDLER_OGM_CALLED)) | |
988 | tvlv_handler->ogm_handler(bat_priv, orig_node, | |
989 | cifnotfound, NULL, 0); | |
990 | ||
991 | tvlv_handler->flags &= ~BATADV_TVLV_HANDLER_OGM_CALLED; | |
992 | } | |
993 | rcu_read_unlock(); | |
994 | ||
995 | return NET_RX_SUCCESS; | |
996 | } | |
997 | ||
998 | /** | |
999 | * batadv_tvlv_ogm_receive - process an incoming ogm and call the appropriate | |
1000 | * handlers | |
1001 | * @bat_priv: the bat priv with all the soft interface information | |
1002 | * @batadv_ogm_packet: ogm packet containing the tvlv containers | |
1003 | * @orig_node: orig node emitting the ogm packet | |
1004 | */ | |
1005 | void batadv_tvlv_ogm_receive(struct batadv_priv *bat_priv, | |
1006 | struct batadv_ogm_packet *batadv_ogm_packet, | |
1007 | struct batadv_orig_node *orig_node) | |
1008 | { | |
1009 | void *tvlv_value; | |
1010 | uint16_t tvlv_value_len; | |
1011 | ||
1012 | if (!batadv_ogm_packet) | |
1013 | return; | |
1014 | ||
1015 | tvlv_value_len = ntohs(batadv_ogm_packet->tvlv_len); | |
1016 | if (!tvlv_value_len) | |
1017 | return; | |
1018 | ||
1019 | tvlv_value = batadv_ogm_packet + 1; | |
1020 | ||
1021 | batadv_tvlv_containers_process(bat_priv, true, orig_node, NULL, NULL, | |
1022 | tvlv_value, tvlv_value_len); | |
1023 | } | |
1024 | ||
1025 | /** | |
1026 | * batadv_tvlv_handler_register - register tvlv handler based on the provided | |
1027 | * type and version (both need to match) for ogm tvlv payload and/or unicast | |
1028 | * payload | |
1029 | * @bat_priv: the bat priv with all the soft interface information | |
1030 | * @optr: ogm tvlv handler callback function. This function receives the orig | |
1031 | * node, flags and the tvlv content as argument to process. | |
1032 | * @uptr: unicast tvlv handler callback function. This function receives the | |
1033 | * source & destination of the unicast packet as well as the tvlv content | |
1034 | * to process. | |
1035 | * @type: tvlv handler type to be registered | |
1036 | * @version: tvlv handler version to be registered | |
1037 | * @flags: flags to enable or disable TVLV API behavior | |
1038 | */ | |
1039 | void batadv_tvlv_handler_register(struct batadv_priv *bat_priv, | |
1040 | void (*optr)(struct batadv_priv *bat_priv, | |
1041 | struct batadv_orig_node *orig, | |
1042 | uint8_t flags, | |
1043 | void *tvlv_value, | |
1044 | uint16_t tvlv_value_len), | |
1045 | int (*uptr)(struct batadv_priv *bat_priv, | |
1046 | uint8_t *src, uint8_t *dst, | |
1047 | void *tvlv_value, | |
1048 | uint16_t tvlv_value_len), | |
1049 | uint8_t type, uint8_t version, uint8_t flags) | |
1050 | { | |
1051 | struct batadv_tvlv_handler *tvlv_handler; | |
1052 | ||
1053 | tvlv_handler = batadv_tvlv_handler_get(bat_priv, type, version); | |
1054 | if (tvlv_handler) { | |
1055 | batadv_tvlv_handler_free_ref(tvlv_handler); | |
1056 | return; | |
1057 | } | |
1058 | ||
1059 | tvlv_handler = kzalloc(sizeof(*tvlv_handler), GFP_ATOMIC); | |
1060 | if (!tvlv_handler) | |
1061 | return; | |
1062 | ||
1063 | tvlv_handler->ogm_handler = optr; | |
1064 | tvlv_handler->unicast_handler = uptr; | |
1065 | tvlv_handler->type = type; | |
1066 | tvlv_handler->version = version; | |
1067 | tvlv_handler->flags = flags; | |
1068 | atomic_set(&tvlv_handler->refcount, 1); | |
1069 | INIT_HLIST_NODE(&tvlv_handler->list); | |
1070 | ||
1071 | spin_lock_bh(&bat_priv->tvlv.handler_list_lock); | |
1072 | hlist_add_head_rcu(&tvlv_handler->list, &bat_priv->tvlv.handler_list); | |
1073 | spin_unlock_bh(&bat_priv->tvlv.handler_list_lock); | |
1074 | } | |
1075 | ||
1076 | /** | |
1077 | * batadv_tvlv_handler_unregister - unregister tvlv handler based on the | |
1078 | * provided type and version (both need to match) | |
1079 | * @bat_priv: the bat priv with all the soft interface information | |
1080 | * @type: tvlv handler type to be unregistered | |
1081 | * @version: tvlv handler version to be unregistered | |
1082 | */ | |
1083 | void batadv_tvlv_handler_unregister(struct batadv_priv *bat_priv, | |
1084 | uint8_t type, uint8_t version) | |
1085 | { | |
1086 | struct batadv_tvlv_handler *tvlv_handler; | |
1087 | ||
1088 | tvlv_handler = batadv_tvlv_handler_get(bat_priv, type, version); | |
1089 | if (!tvlv_handler) | |
1090 | return; | |
1091 | ||
1092 | batadv_tvlv_handler_free_ref(tvlv_handler); | |
1093 | spin_lock_bh(&bat_priv->tvlv.handler_list_lock); | |
1094 | hlist_del_rcu(&tvlv_handler->list); | |
1095 | spin_unlock_bh(&bat_priv->tvlv.handler_list_lock); | |
1096 | batadv_tvlv_handler_free_ref(tvlv_handler); | |
1097 | } | |
1098 | ||
1099 | /** | |
1100 | * batadv_tvlv_unicast_send - send a unicast packet with tvlv payload to the | |
1101 | * specified host | |
1102 | * @bat_priv: the bat priv with all the soft interface information | |
1103 | * @src: source mac address of the unicast packet | |
1104 | * @dst: destination mac address of the unicast packet | |
1105 | * @type: tvlv type | |
1106 | * @version: tvlv version | |
1107 | * @tvlv_value: tvlv content | |
1108 | * @tvlv_value_len: tvlv content length | |
1109 | */ | |
1110 | void batadv_tvlv_unicast_send(struct batadv_priv *bat_priv, uint8_t *src, | |
1111 | uint8_t *dst, uint8_t type, uint8_t version, | |
1112 | void *tvlv_value, uint16_t tvlv_value_len) | |
1113 | { | |
1114 | struct batadv_unicast_tvlv_packet *unicast_tvlv_packet; | |
1115 | struct batadv_tvlv_hdr *tvlv_hdr; | |
1116 | struct batadv_orig_node *orig_node; | |
1117 | struct sk_buff *skb = NULL; | |
1118 | unsigned char *tvlv_buff; | |
1119 | unsigned int tvlv_len; | |
1120 | ssize_t hdr_len = sizeof(*unicast_tvlv_packet); | |
1121 | bool ret = false; | |
1122 | ||
1123 | orig_node = batadv_orig_hash_find(bat_priv, dst); | |
1124 | if (!orig_node) | |
1125 | goto out; | |
1126 | ||
1127 | tvlv_len = sizeof(*tvlv_hdr) + tvlv_value_len; | |
1128 | ||
1129 | skb = netdev_alloc_skb_ip_align(NULL, ETH_HLEN + hdr_len + tvlv_len); | |
1130 | if (!skb) | |
1131 | goto out; | |
1132 | ||
1133 | skb->priority = TC_PRIO_CONTROL; | |
1134 | skb_reserve(skb, ETH_HLEN); | |
1135 | tvlv_buff = skb_put(skb, sizeof(*unicast_tvlv_packet) + tvlv_len); | |
1136 | unicast_tvlv_packet = (struct batadv_unicast_tvlv_packet *)tvlv_buff; | |
a40d9b07 SW |
1137 | unicast_tvlv_packet->packet_type = BATADV_UNICAST_TVLV; |
1138 | unicast_tvlv_packet->version = BATADV_COMPAT_VERSION; | |
1139 | unicast_tvlv_packet->ttl = BATADV_TTL; | |
ef261577 ML |
1140 | unicast_tvlv_packet->reserved = 0; |
1141 | unicast_tvlv_packet->tvlv_len = htons(tvlv_len); | |
1142 | unicast_tvlv_packet->align = 0; | |
8fdd0153 AQ |
1143 | ether_addr_copy(unicast_tvlv_packet->src, src); |
1144 | ether_addr_copy(unicast_tvlv_packet->dst, dst); | |
ef261577 ML |
1145 | |
1146 | tvlv_buff = (unsigned char *)(unicast_tvlv_packet + 1); | |
1147 | tvlv_hdr = (struct batadv_tvlv_hdr *)tvlv_buff; | |
1148 | tvlv_hdr->version = version; | |
1149 | tvlv_hdr->type = type; | |
1150 | tvlv_hdr->len = htons(tvlv_value_len); | |
1151 | tvlv_buff += sizeof(*tvlv_hdr); | |
1152 | memcpy(tvlv_buff, tvlv_value, tvlv_value_len); | |
1153 | ||
1154 | if (batadv_send_skb_to_orig(skb, orig_node, NULL) != NET_XMIT_DROP) | |
1155 | ret = true; | |
1156 | ||
1157 | out: | |
1158 | if (skb && !ret) | |
1159 | kfree_skb(skb); | |
1160 | if (orig_node) | |
1161 | batadv_orig_node_free_ref(orig_node); | |
1162 | } | |
1163 | ||
c018ad3d AQ |
1164 | /** |
1165 | * batadv_get_vid - extract the VLAN identifier from skb if any | |
1166 | * @skb: the buffer containing the packet | |
1167 | * @header_len: length of the batman header preceding the ethernet header | |
1168 | * | |
1169 | * If the packet embedded in the skb is vlan tagged this function returns the | |
1170 | * VID with the BATADV_VLAN_HAS_TAG flag. Otherwise BATADV_NO_FLAGS is returned. | |
1171 | */ | |
1172 | unsigned short batadv_get_vid(struct sk_buff *skb, size_t header_len) | |
1173 | { | |
1174 | struct ethhdr *ethhdr = (struct ethhdr *)(skb->data + header_len); | |
1175 | struct vlan_ethhdr *vhdr; | |
1176 | unsigned short vid; | |
1177 | ||
1178 | if (ethhdr->h_proto != htons(ETH_P_8021Q)) | |
1179 | return BATADV_NO_FLAGS; | |
1180 | ||
1181 | if (!pskb_may_pull(skb, header_len + VLAN_ETH_HLEN)) | |
1182 | return BATADV_NO_FLAGS; | |
1183 | ||
1184 | vhdr = (struct vlan_ethhdr *)(skb->data + header_len); | |
1185 | vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK; | |
1186 | vid |= BATADV_VLAN_HAS_TAG; | |
1187 | ||
1188 | return vid; | |
1189 | } | |
1190 | ||
eceb22ae AQ |
1191 | /** |
1192 | * batadv_vlan_ap_isola_get - return the AP isolation status for the given vlan | |
1193 | * @bat_priv: the bat priv with all the soft interface information | |
1194 | * @vid: the VLAN identifier for which the AP isolation attributed as to be | |
1195 | * looked up | |
1196 | * | |
1197 | * Returns true if AP isolation is on for the VLAN idenfied by vid, false | |
1198 | * otherwise | |
1199 | */ | |
1200 | bool batadv_vlan_ap_isola_get(struct batadv_priv *bat_priv, unsigned short vid) | |
1201 | { | |
1202 | bool ap_isolation_enabled = false; | |
1203 | struct batadv_softif_vlan *vlan; | |
1204 | ||
1205 | /* if the AP isolation is requested on a VLAN, then check for its | |
1206 | * setting in the proper VLAN private data structure | |
1207 | */ | |
1208 | vlan = batadv_softif_vlan_get(bat_priv, vid); | |
1209 | if (vlan) { | |
1210 | ap_isolation_enabled = atomic_read(&vlan->ap_isolation); | |
1211 | batadv_softif_vlan_free_ref(vlan); | |
1212 | } | |
1213 | ||
1214 | return ap_isolation_enabled; | |
1215 | } | |
1216 | ||
ee11ad61 | 1217 | static int batadv_param_set_ra(const char *val, const struct kernel_param *kp) |
d419be1f | 1218 | { |
56303d34 | 1219 | struct batadv_algo_ops *bat_algo_ops; |
d8cb5486 ML |
1220 | char *algo_name = (char *)val; |
1221 | size_t name_len = strlen(algo_name); | |
d419be1f | 1222 | |
293c9c1c | 1223 | if (name_len > 0 && algo_name[name_len - 1] == '\n') |
d8cb5486 ML |
1224 | algo_name[name_len - 1] = '\0'; |
1225 | ||
ee11ad61 | 1226 | bat_algo_ops = batadv_algo_get(algo_name); |
d419be1f | 1227 | if (!bat_algo_ops) { |
d8cb5486 | 1228 | pr_err("Routing algorithm '%s' is not supported\n", algo_name); |
d419be1f ML |
1229 | return -EINVAL; |
1230 | } | |
1231 | ||
d8cb5486 | 1232 | return param_set_copystring(algo_name, kp); |
d419be1f ML |
1233 | } |
1234 | ||
ee11ad61 SE |
1235 | static const struct kernel_param_ops batadv_param_ops_ra = { |
1236 | .set = batadv_param_set_ra, | |
d419be1f ML |
1237 | .get = param_get_string, |
1238 | }; | |
1239 | ||
ee11ad61 | 1240 | static struct kparam_string batadv_param_string_ra = { |
3193e8fd SE |
1241 | .maxlen = sizeof(batadv_routing_algo), |
1242 | .string = batadv_routing_algo, | |
d419be1f ML |
1243 | }; |
1244 | ||
ee11ad61 SE |
1245 | module_param_cb(routing_algo, &batadv_param_ops_ra, &batadv_param_string_ra, |
1246 | 0644); | |
1247 | module_init(batadv_init); | |
1248 | module_exit(batadv_exit); | |
c6c8fea2 SE |
1249 | |
1250 | MODULE_LICENSE("GPL"); | |
1251 | ||
42d0b044 SE |
1252 | MODULE_AUTHOR(BATADV_DRIVER_AUTHOR); |
1253 | MODULE_DESCRIPTION(BATADV_DRIVER_DESC); | |
1254 | MODULE_SUPPORTED_DEVICE(BATADV_DRIVER_DEVICE); | |
1255 | MODULE_VERSION(BATADV_SOURCE_VERSION); |