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0b873931 | 1 | /* Copyright (C) 2007-2013 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 | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
17 | * 02110-1301, USA | |
c6c8fea2 SE |
18 | */ |
19 | ||
95a066d8 SE |
20 | #include <linux/crc32c.h> |
21 | #include <linux/highmem.h> | |
c54f38c9 SW |
22 | #include <linux/if_vlan.h> |
23 | #include <net/ip.h> | |
24 | #include <net/ipv6.h> | |
25 | #include <net/dsfield.h> | |
c6c8fea2 | 26 | #include "main.h" |
b706b13b SE |
27 | #include "sysfs.h" |
28 | #include "debugfs.h" | |
c6c8fea2 SE |
29 | #include "routing.h" |
30 | #include "send.h" | |
31 | #include "originator.h" | |
32 | #include "soft-interface.h" | |
33 | #include "icmp_socket.h" | |
34 | #include "translation-table.h" | |
35 | #include "hard-interface.h" | |
36 | #include "gateway_client.h" | |
23721387 | 37 | #include "bridge_loop_avoidance.h" |
2f1dfbe1 | 38 | #include "distributed-arp-table.h" |
414254e3 | 39 | #include "gateway_common.h" |
c6c8fea2 | 40 | #include "hash.h" |
1c280471 | 41 | #include "bat_algo.h" |
d353d8d4 | 42 | #include "network-coding.h" |
610bfc6b | 43 | #include "fragmentation.h" |
c6c8fea2 | 44 | |
c3caf519 SE |
45 | |
46 | /* List manipulations on hardif_list have to be rtnl_lock()'ed, | |
9cfc7bd6 SE |
47 | * list traversals just rcu-locked |
48 | */ | |
3193e8fd | 49 | struct list_head batadv_hardif_list; |
ee11ad61 | 50 | static int (*batadv_rx_handler[256])(struct sk_buff *, |
56303d34 | 51 | struct batadv_hard_iface *); |
3193e8fd | 52 | char batadv_routing_algo[20] = "BATMAN_IV"; |
ee11ad61 | 53 | static struct hlist_head batadv_algo_list; |
c6c8fea2 | 54 | |
3193e8fd | 55 | unsigned char batadv_broadcast_addr[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; |
c6c8fea2 | 56 | |
3193e8fd | 57 | struct workqueue_struct *batadv_event_workqueue; |
c6c8fea2 | 58 | |
ee11ad61 | 59 | static void batadv_recv_handler_init(void); |
ffa995e0 | 60 | |
ee11ad61 | 61 | static int __init batadv_init(void) |
c6c8fea2 | 62 | { |
3193e8fd | 63 | INIT_LIST_HEAD(&batadv_hardif_list); |
ee11ad61 | 64 | INIT_HLIST_HEAD(&batadv_algo_list); |
1c280471 | 65 | |
ee11ad61 | 66 | batadv_recv_handler_init(); |
ffa995e0 | 67 | |
81c524f7 | 68 | batadv_iv_init(); |
6c519bad | 69 | batadv_nc_init(); |
c6c8fea2 | 70 | |
3193e8fd | 71 | batadv_event_workqueue = create_singlethread_workqueue("bat_events"); |
c6c8fea2 | 72 | |
3193e8fd | 73 | if (!batadv_event_workqueue) |
c6c8fea2 SE |
74 | return -ENOMEM; |
75 | ||
9039dc7e | 76 | batadv_socket_init(); |
40a072d7 | 77 | batadv_debugfs_init(); |
c6c8fea2 | 78 | |
9563877e | 79 | register_netdevice_notifier(&batadv_hard_if_notifier); |
a4ac28c0 | 80 | rtnl_link_register(&batadv_link_ops); |
c6c8fea2 | 81 | |
86ceb360 | 82 | pr_info("B.A.T.M.A.N. advanced %s (compatibility version %i) loaded\n", |
42d0b044 | 83 | BATADV_SOURCE_VERSION, BATADV_COMPAT_VERSION); |
c6c8fea2 SE |
84 | |
85 | return 0; | |
86 | } | |
87 | ||
ee11ad61 | 88 | static void __exit batadv_exit(void) |
c6c8fea2 | 89 | { |
40a072d7 | 90 | batadv_debugfs_destroy(); |
a4ac28c0 | 91 | rtnl_link_unregister(&batadv_link_ops); |
9563877e SE |
92 | unregister_netdevice_notifier(&batadv_hard_if_notifier); |
93 | batadv_hardif_remove_interfaces(); | |
c6c8fea2 | 94 | |
3193e8fd SE |
95 | flush_workqueue(batadv_event_workqueue); |
96 | destroy_workqueue(batadv_event_workqueue); | |
97 | batadv_event_workqueue = NULL; | |
c6c8fea2 SE |
98 | |
99 | rcu_barrier(); | |
100 | } | |
101 | ||
3193e8fd | 102 | int batadv_mesh_init(struct net_device *soft_iface) |
c6c8fea2 | 103 | { |
56303d34 | 104 | struct batadv_priv *bat_priv = netdev_priv(soft_iface); |
5346c35e | 105 | int ret; |
c6c8fea2 | 106 | |
c6c8fea2 SE |
107 | spin_lock_init(&bat_priv->forw_bat_list_lock); |
108 | spin_lock_init(&bat_priv->forw_bcast_list_lock); | |
807736f6 SE |
109 | spin_lock_init(&bat_priv->tt.changes_list_lock); |
110 | spin_lock_init(&bat_priv->tt.req_list_lock); | |
111 | spin_lock_init(&bat_priv->tt.roam_list_lock); | |
112 | spin_lock_init(&bat_priv->tt.last_changeset_lock); | |
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); | |
c6c8fea2 SE |
116 | |
117 | INIT_HLIST_HEAD(&bat_priv->forw_bat_list); | |
118 | INIT_HLIST_HEAD(&bat_priv->forw_bcast_list); | |
807736f6 SE |
119 | INIT_HLIST_HEAD(&bat_priv->gw.list); |
120 | INIT_LIST_HEAD(&bat_priv->tt.changes_list); | |
121 | INIT_LIST_HEAD(&bat_priv->tt.req_list); | |
122 | INIT_LIST_HEAD(&bat_priv->tt.roam_list); | |
ef261577 ML |
123 | INIT_HLIST_HEAD(&bat_priv->tvlv.container_list); |
124 | INIT_HLIST_HEAD(&bat_priv->tvlv.handler_list); | |
c6c8fea2 | 125 | |
7d211efc | 126 | ret = batadv_originator_init(bat_priv); |
5346c35e | 127 | if (ret < 0) |
c6c8fea2 SE |
128 | goto err; |
129 | ||
08c36d3e | 130 | ret = batadv_tt_init(bat_priv); |
5346c35e | 131 | if (ret < 0) |
c6c8fea2 SE |
132 | goto err; |
133 | ||
42d0b044 | 134 | batadv_tt_local_add(soft_iface, soft_iface->dev_addr, |
c018ad3d | 135 | BATADV_NO_FLAGS, BATADV_NULL_IFINDEX); |
c6c8fea2 | 136 | |
08adf151 | 137 | ret = batadv_bla_init(bat_priv); |
5346c35e | 138 | if (ret < 0) |
23721387 SW |
139 | goto err; |
140 | ||
2f1dfbe1 AQ |
141 | ret = batadv_dat_init(bat_priv); |
142 | if (ret < 0) | |
143 | goto err; | |
144 | ||
6c519bad | 145 | ret = batadv_nc_mesh_init(bat_priv); |
d353d8d4 MH |
146 | if (ret < 0) |
147 | goto err; | |
148 | ||
414254e3 ML |
149 | batadv_gw_init(bat_priv); |
150 | ||
807736f6 | 151 | atomic_set(&bat_priv->gw.reselect, 0); |
39c75a51 | 152 | atomic_set(&bat_priv->mesh_state, BATADV_MESH_ACTIVE); |
5346c35e SE |
153 | |
154 | return 0; | |
c6c8fea2 SE |
155 | |
156 | err: | |
3193e8fd | 157 | batadv_mesh_free(soft_iface); |
5346c35e | 158 | return ret; |
c6c8fea2 SE |
159 | } |
160 | ||
3193e8fd | 161 | void batadv_mesh_free(struct net_device *soft_iface) |
c6c8fea2 | 162 | { |
56303d34 | 163 | struct batadv_priv *bat_priv = netdev_priv(soft_iface); |
c6c8fea2 | 164 | |
39c75a51 | 165 | atomic_set(&bat_priv->mesh_state, BATADV_MESH_DEACTIVATING); |
c6c8fea2 | 166 | |
9455e34c | 167 | batadv_purge_outstanding_packets(bat_priv, NULL); |
c6c8fea2 | 168 | |
7cf06bc6 | 169 | batadv_gw_node_purge(bat_priv); |
6c519bad | 170 | batadv_nc_mesh_free(bat_priv); |
a4361860 AQ |
171 | batadv_dat_free(bat_priv); |
172 | batadv_bla_free(bat_priv); | |
c6c8fea2 | 173 | |
a4361860 AQ |
174 | /* Free the TT and the originator tables only after having terminated |
175 | * all the other depending components which may use these structures for | |
176 | * their purposes. | |
177 | */ | |
08c36d3e | 178 | batadv_tt_free(bat_priv); |
c6c8fea2 | 179 | |
a4361860 AQ |
180 | /* Since the originator table clean up routine is accessing the TT |
181 | * tables as well, it has to be invoked after the TT tables have been | |
182 | * freed and marked as empty. This ensures that no cleanup RCU callbacks | |
183 | * accessing the TT data are scheduled for later execution. | |
184 | */ | |
185 | batadv_originator_free(bat_priv); | |
2f1dfbe1 | 186 | |
414254e3 ML |
187 | batadv_gw_free(bat_priv); |
188 | ||
f8214865 | 189 | free_percpu(bat_priv->bat_counters); |
f69ae770 | 190 | bat_priv->bat_counters = NULL; |
f8214865 | 191 | |
39c75a51 | 192 | atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE); |
c6c8fea2 SE |
193 | } |
194 | ||
6e0895c2 DM |
195 | /** |
196 | * batadv_is_my_mac - check if the given mac address belongs to any of the real | |
197 | * interfaces in the current mesh | |
198 | * @bat_priv: the bat priv with all the soft interface information | |
199 | * @addr: the address to check | |
200 | */ | |
fe8a93b9 | 201 | int batadv_is_my_mac(struct batadv_priv *bat_priv, const uint8_t *addr) |
c6c8fea2 | 202 | { |
56303d34 | 203 | const struct batadv_hard_iface *hard_iface; |
c6c8fea2 SE |
204 | |
205 | rcu_read_lock(); | |
3193e8fd | 206 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e9a4f295 | 207 | if (hard_iface->if_status != BATADV_IF_ACTIVE) |
c6c8fea2 SE |
208 | continue; |
209 | ||
fe8a93b9 AQ |
210 | if (hard_iface->soft_iface != bat_priv->soft_iface) |
211 | continue; | |
212 | ||
1eda58bf | 213 | if (batadv_compare_eth(hard_iface->net_dev->dev_addr, addr)) { |
c6c8fea2 SE |
214 | rcu_read_unlock(); |
215 | return 1; | |
216 | } | |
217 | } | |
218 | rcu_read_unlock(); | |
219 | return 0; | |
c6c8fea2 SE |
220 | } |
221 | ||
30da63a6 ML |
222 | /** |
223 | * batadv_seq_print_text_primary_if_get - called from debugfs table printing | |
224 | * function that requires the primary interface | |
225 | * @seq: debugfs table seq_file struct | |
226 | * | |
227 | * Returns primary interface if found or NULL otherwise. | |
228 | */ | |
229 | struct batadv_hard_iface * | |
230 | batadv_seq_print_text_primary_if_get(struct seq_file *seq) | |
231 | { | |
232 | struct net_device *net_dev = (struct net_device *)seq->private; | |
233 | struct batadv_priv *bat_priv = netdev_priv(net_dev); | |
234 | struct batadv_hard_iface *primary_if; | |
235 | ||
236 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
237 | ||
238 | if (!primary_if) { | |
239 | seq_printf(seq, | |
240 | "BATMAN mesh %s disabled - please specify interfaces to enable it\n", | |
241 | net_dev->name); | |
242 | goto out; | |
243 | } | |
244 | ||
245 | if (primary_if->if_status == BATADV_IF_ACTIVE) | |
246 | goto out; | |
247 | ||
248 | seq_printf(seq, | |
249 | "BATMAN mesh %s disabled - primary interface not active\n", | |
250 | net_dev->name); | |
251 | batadv_hardif_free_ref(primary_if); | |
252 | primary_if = NULL; | |
253 | ||
254 | out: | |
255 | return primary_if; | |
256 | } | |
257 | ||
411d6ed9 ML |
258 | /** |
259 | * batadv_max_header_len - calculate maximum encapsulation overhead for a | |
260 | * payload packet | |
261 | * | |
262 | * Return the maximum encapsulation overhead in bytes. | |
263 | */ | |
264 | int batadv_max_header_len(void) | |
265 | { | |
266 | int header_len = 0; | |
267 | ||
268 | header_len = max_t(int, header_len, | |
269 | sizeof(struct batadv_unicast_packet)); | |
270 | header_len = max_t(int, header_len, | |
271 | sizeof(struct batadv_unicast_4addr_packet)); | |
272 | header_len = max_t(int, header_len, | |
273 | sizeof(struct batadv_bcast_packet)); | |
274 | ||
275 | #ifdef CONFIG_BATMAN_ADV_NC | |
276 | header_len = max_t(int, header_len, | |
277 | sizeof(struct batadv_coded_packet)); | |
278 | #endif | |
279 | ||
280 | return header_len; | |
281 | } | |
282 | ||
c54f38c9 SW |
283 | /** |
284 | * batadv_skb_set_priority - sets skb priority according to packet content | |
285 | * @skb: the packet to be sent | |
286 | * @offset: offset to the packet content | |
287 | * | |
288 | * This function sets a value between 256 and 263 (802.1d priority), which | |
289 | * can be interpreted by the cfg80211 or other drivers. | |
290 | */ | |
291 | void batadv_skb_set_priority(struct sk_buff *skb, int offset) | |
292 | { | |
293 | struct iphdr ip_hdr_tmp, *ip_hdr; | |
294 | struct ipv6hdr ip6_hdr_tmp, *ip6_hdr; | |
295 | struct ethhdr ethhdr_tmp, *ethhdr; | |
296 | struct vlan_ethhdr *vhdr, vhdr_tmp; | |
297 | u32 prio; | |
298 | ||
299 | /* already set, do nothing */ | |
300 | if (skb->priority >= 256 && skb->priority <= 263) | |
301 | return; | |
302 | ||
303 | ethhdr = skb_header_pointer(skb, offset, sizeof(*ethhdr), ðhdr_tmp); | |
304 | if (!ethhdr) | |
305 | return; | |
306 | ||
307 | switch (ethhdr->h_proto) { | |
308 | case htons(ETH_P_8021Q): | |
309 | vhdr = skb_header_pointer(skb, offset + sizeof(*vhdr), | |
310 | sizeof(*vhdr), &vhdr_tmp); | |
311 | if (!vhdr) | |
312 | return; | |
313 | prio = ntohs(vhdr->h_vlan_TCI) & VLAN_PRIO_MASK; | |
314 | prio = prio >> VLAN_PRIO_SHIFT; | |
315 | break; | |
316 | case htons(ETH_P_IP): | |
317 | ip_hdr = skb_header_pointer(skb, offset + sizeof(*ethhdr), | |
318 | sizeof(*ip_hdr), &ip_hdr_tmp); | |
319 | if (!ip_hdr) | |
320 | return; | |
321 | prio = (ipv4_get_dsfield(ip_hdr) & 0xfc) >> 5; | |
322 | break; | |
323 | case htons(ETH_P_IPV6): | |
324 | ip6_hdr = skb_header_pointer(skb, offset + sizeof(*ethhdr), | |
325 | sizeof(*ip6_hdr), &ip6_hdr_tmp); | |
326 | if (!ip6_hdr) | |
327 | return; | |
328 | prio = (ipv6_get_dsfield(ip6_hdr) & 0xfc) >> 5; | |
329 | break; | |
330 | default: | |
331 | return; | |
332 | } | |
333 | ||
334 | skb->priority = prio + 256; | |
335 | } | |
336 | ||
ee11ad61 | 337 | static int batadv_recv_unhandled_packet(struct sk_buff *skb, |
56303d34 | 338 | struct batadv_hard_iface *recv_if) |
ffa995e0 ML |
339 | { |
340 | return NET_RX_DROP; | |
341 | } | |
342 | ||
343 | /* incoming packets with the batman ethertype received on any active hard | |
344 | * interface | |
345 | */ | |
3193e8fd SE |
346 | int batadv_batman_skb_recv(struct sk_buff *skb, struct net_device *dev, |
347 | struct packet_type *ptype, | |
348 | struct net_device *orig_dev) | |
ffa995e0 | 349 | { |
56303d34 | 350 | struct batadv_priv *bat_priv; |
96412690 | 351 | struct batadv_ogm_packet *batadv_ogm_packet; |
56303d34 | 352 | struct batadv_hard_iface *hard_iface; |
ffa995e0 ML |
353 | uint8_t idx; |
354 | int ret; | |
355 | ||
56303d34 SE |
356 | hard_iface = container_of(ptype, struct batadv_hard_iface, |
357 | batman_adv_ptype); | |
ffa995e0 ML |
358 | skb = skb_share_check(skb, GFP_ATOMIC); |
359 | ||
360 | /* skb was released by skb_share_check() */ | |
361 | if (!skb) | |
362 | goto err_out; | |
363 | ||
364 | /* packet should hold at least type and version */ | |
365 | if (unlikely(!pskb_may_pull(skb, 2))) | |
366 | goto err_free; | |
367 | ||
368 | /* expect a valid ethernet header here. */ | |
369 | if (unlikely(skb->mac_len != ETH_HLEN || !skb_mac_header(skb))) | |
370 | goto err_free; | |
371 | ||
372 | if (!hard_iface->soft_iface) | |
373 | goto err_free; | |
374 | ||
375 | bat_priv = netdev_priv(hard_iface->soft_iface); | |
376 | ||
39c75a51 | 377 | if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) |
ffa995e0 ML |
378 | goto err_free; |
379 | ||
380 | /* discard frames on not active interfaces */ | |
e9a4f295 | 381 | if (hard_iface->if_status != BATADV_IF_ACTIVE) |
ffa995e0 ML |
382 | goto err_free; |
383 | ||
96412690 | 384 | batadv_ogm_packet = (struct batadv_ogm_packet *)skb->data; |
ffa995e0 | 385 | |
96412690 | 386 | if (batadv_ogm_packet->header.version != BATADV_COMPAT_VERSION) { |
39c75a51 | 387 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 388 | "Drop packet: incompatible batman version (%i)\n", |
96412690 | 389 | batadv_ogm_packet->header.version); |
ffa995e0 ML |
390 | goto err_free; |
391 | } | |
392 | ||
393 | /* all receive handlers return whether they received or reused | |
394 | * the supplied skb. if not, we have to free the skb. | |
395 | */ | |
96412690 | 396 | idx = batadv_ogm_packet->header.packet_type; |
ee11ad61 | 397 | ret = (*batadv_rx_handler[idx])(skb, hard_iface); |
ffa995e0 ML |
398 | |
399 | if (ret == NET_RX_DROP) | |
400 | kfree_skb(skb); | |
401 | ||
402 | /* return NET_RX_SUCCESS in any case as we | |
403 | * most probably dropped the packet for | |
404 | * routing-logical reasons. | |
405 | */ | |
406 | return NET_RX_SUCCESS; | |
407 | ||
408 | err_free: | |
409 | kfree_skb(skb); | |
410 | err_out: | |
411 | return NET_RX_DROP; | |
412 | } | |
413 | ||
ee11ad61 | 414 | static void batadv_recv_handler_init(void) |
ffa995e0 ML |
415 | { |
416 | int i; | |
417 | ||
ee11ad61 SE |
418 | for (i = 0; i < ARRAY_SIZE(batadv_rx_handler); i++) |
419 | batadv_rx_handler[i] = batadv_recv_unhandled_packet; | |
ffa995e0 | 420 | |
a1f1ac5c SW |
421 | for (i = BATADV_UNICAST_MIN; i <= BATADV_UNICAST_MAX; i++) |
422 | batadv_rx_handler[i] = batadv_recv_unhandled_unicast_packet; | |
423 | ||
80067c83 SW |
424 | /* compile time checks for struct member offsets */ |
425 | BUILD_BUG_ON(offsetof(struct batadv_unicast_4addr_packet, src) != 10); | |
426 | BUILD_BUG_ON(offsetof(struct batadv_unicast_packet, dest) != 4); | |
80067c83 | 427 | BUILD_BUG_ON(offsetof(struct batadv_unicast_tvlv_packet, dst) != 4); |
610bfc6b | 428 | BUILD_BUG_ON(offsetof(struct batadv_frag_packet, dest) != 4); |
0bf84c16 AQ |
429 | BUILD_BUG_ON(offsetof(struct batadv_icmp_packet, icmph.dst) != 4); |
430 | BUILD_BUG_ON(offsetof(struct batadv_icmp_packet_rr, icmph.dst) != 4); | |
80067c83 | 431 | |
a1f1ac5c SW |
432 | /* broadcast packet */ |
433 | batadv_rx_handler[BATADV_BCAST] = batadv_recv_bcast_packet; | |
434 | ||
435 | /* unicast packets ... */ | |
7cdcf6dd AQ |
436 | /* unicast with 4 addresses packet */ |
437 | batadv_rx_handler[BATADV_UNICAST_4ADDR] = batadv_recv_unicast_packet; | |
ffa995e0 | 438 | /* unicast packet */ |
acd34afa | 439 | batadv_rx_handler[BATADV_UNICAST] = batadv_recv_unicast_packet; |
ef261577 ML |
440 | /* unicast tvlv packet */ |
441 | batadv_rx_handler[BATADV_UNICAST_TVLV] = batadv_recv_unicast_tvlv; | |
a1f1ac5c SW |
442 | /* batman icmp packet */ |
443 | batadv_rx_handler[BATADV_ICMP] = batadv_recv_icmp_packet; | |
610bfc6b MH |
444 | /* Fragmented packets */ |
445 | batadv_rx_handler[BATADV_UNICAST_FRAG] = batadv_recv_frag_packet; | |
ffa995e0 ML |
446 | } |
447 | ||
56303d34 SE |
448 | int |
449 | batadv_recv_handler_register(uint8_t packet_type, | |
450 | int (*recv_handler)(struct sk_buff *, | |
451 | struct batadv_hard_iface *)) | |
ffa995e0 | 452 | { |
a1f1ac5c SW |
453 | int (*curr)(struct sk_buff *, |
454 | struct batadv_hard_iface *); | |
455 | curr = batadv_rx_handler[packet_type]; | |
456 | ||
457 | if ((curr != batadv_recv_unhandled_packet) && | |
458 | (curr != batadv_recv_unhandled_unicast_packet)) | |
ffa995e0 ML |
459 | return -EBUSY; |
460 | ||
ee11ad61 | 461 | batadv_rx_handler[packet_type] = recv_handler; |
ffa995e0 ML |
462 | return 0; |
463 | } | |
464 | ||
3193e8fd | 465 | void batadv_recv_handler_unregister(uint8_t packet_type) |
ffa995e0 | 466 | { |
ee11ad61 | 467 | batadv_rx_handler[packet_type] = batadv_recv_unhandled_packet; |
ffa995e0 ML |
468 | } |
469 | ||
56303d34 | 470 | static struct batadv_algo_ops *batadv_algo_get(char *name) |
1c280471 | 471 | { |
56303d34 | 472 | struct batadv_algo_ops *bat_algo_ops = NULL, *bat_algo_ops_tmp; |
1c280471 | 473 | |
b67bfe0d | 474 | hlist_for_each_entry(bat_algo_ops_tmp, &batadv_algo_list, list) { |
1c280471 ML |
475 | if (strcmp(bat_algo_ops_tmp->name, name) != 0) |
476 | continue; | |
477 | ||
478 | bat_algo_ops = bat_algo_ops_tmp; | |
479 | break; | |
480 | } | |
481 | ||
482 | return bat_algo_ops; | |
483 | } | |
484 | ||
56303d34 | 485 | int batadv_algo_register(struct batadv_algo_ops *bat_algo_ops) |
1c280471 | 486 | { |
56303d34 | 487 | struct batadv_algo_ops *bat_algo_ops_tmp; |
5346c35e | 488 | int ret; |
1c280471 | 489 | |
ee11ad61 | 490 | bat_algo_ops_tmp = batadv_algo_get(bat_algo_ops->name); |
1c280471 | 491 | if (bat_algo_ops_tmp) { |
86ceb360 SE |
492 | pr_info("Trying to register already registered routing algorithm: %s\n", |
493 | bat_algo_ops->name); | |
5346c35e | 494 | ret = -EEXIST; |
1c280471 ML |
495 | goto out; |
496 | } | |
497 | ||
01c4224b | 498 | /* all algorithms must implement all ops (for now) */ |
c2aca022 | 499 | if (!bat_algo_ops->bat_iface_enable || |
00a50076 | 500 | !bat_algo_ops->bat_iface_disable || |
c3229398 | 501 | !bat_algo_ops->bat_iface_update_mac || |
cd8b78e7 | 502 | !bat_algo_ops->bat_primary_iface_set || |
01c4224b | 503 | !bat_algo_ops->bat_ogm_schedule || |
c3e29312 | 504 | !bat_algo_ops->bat_ogm_emit) { |
01c4224b ML |
505 | pr_info("Routing algo '%s' does not implement required ops\n", |
506 | bat_algo_ops->name); | |
5346c35e | 507 | ret = -EINVAL; |
01c4224b ML |
508 | goto out; |
509 | } | |
510 | ||
1c280471 | 511 | INIT_HLIST_NODE(&bat_algo_ops->list); |
ee11ad61 | 512 | hlist_add_head(&bat_algo_ops->list, &batadv_algo_list); |
1c280471 ML |
513 | ret = 0; |
514 | ||
515 | out: | |
516 | return ret; | |
517 | } | |
518 | ||
56303d34 | 519 | int batadv_algo_select(struct batadv_priv *bat_priv, char *name) |
1c280471 | 520 | { |
56303d34 | 521 | struct batadv_algo_ops *bat_algo_ops; |
5346c35e | 522 | int ret = -EINVAL; |
1c280471 | 523 | |
ee11ad61 | 524 | bat_algo_ops = batadv_algo_get(name); |
1c280471 ML |
525 | if (!bat_algo_ops) |
526 | goto out; | |
527 | ||
528 | bat_priv->bat_algo_ops = bat_algo_ops; | |
529 | ret = 0; | |
530 | ||
531 | out: | |
532 | return ret; | |
533 | } | |
534 | ||
3193e8fd | 535 | int batadv_algo_seq_print_text(struct seq_file *seq, void *offset) |
1c280471 | 536 | { |
56303d34 | 537 | struct batadv_algo_ops *bat_algo_ops; |
1c280471 | 538 | |
0c814653 | 539 | seq_puts(seq, "Available routing algorithms:\n"); |
1c280471 | 540 | |
b67bfe0d | 541 | hlist_for_each_entry(bat_algo_ops, &batadv_algo_list, list) { |
1c280471 ML |
542 | seq_printf(seq, "%s\n", bat_algo_ops->name); |
543 | } | |
544 | ||
545 | return 0; | |
546 | } | |
547 | ||
95a066d8 SE |
548 | /** |
549 | * batadv_skb_crc32 - calculate CRC32 of the whole packet and skip bytes in | |
550 | * the header | |
551 | * @skb: skb pointing to fragmented socket buffers | |
552 | * @payload_ptr: Pointer to position inside the head buffer of the skb | |
553 | * marking the start of the data to be CRC'ed | |
554 | * | |
555 | * payload_ptr must always point to an address in the skb head buffer and not to | |
556 | * a fragment. | |
557 | */ | |
558 | __be32 batadv_skb_crc32(struct sk_buff *skb, u8 *payload_ptr) | |
559 | { | |
560 | u32 crc = 0; | |
561 | unsigned int from; | |
562 | unsigned int to = skb->len; | |
563 | struct skb_seq_state st; | |
564 | const u8 *data; | |
565 | unsigned int len; | |
566 | unsigned int consumed = 0; | |
567 | ||
568 | from = (unsigned int)(payload_ptr - skb->data); | |
569 | ||
570 | skb_prepare_seq_read(skb, from, to, &st); | |
571 | while ((len = skb_seq_read(consumed, &data, &st)) != 0) { | |
572 | crc = crc32c(crc, data, len); | |
573 | consumed += len; | |
574 | } | |
95a066d8 SE |
575 | |
576 | return htonl(crc); | |
577 | } | |
578 | ||
ef261577 ML |
579 | /** |
580 | * batadv_tvlv_handler_free_ref - decrement the tvlv handler refcounter and | |
581 | * possibly free it | |
582 | * @tvlv_handler: the tvlv handler to free | |
583 | */ | |
584 | static void | |
585 | batadv_tvlv_handler_free_ref(struct batadv_tvlv_handler *tvlv_handler) | |
586 | { | |
587 | if (atomic_dec_and_test(&tvlv_handler->refcount)) | |
588 | kfree_rcu(tvlv_handler, rcu); | |
589 | } | |
590 | ||
591 | /** | |
592 | * batadv_tvlv_handler_get - retrieve tvlv handler from the tvlv handler list | |
593 | * based on the provided type and version (both need to match) | |
594 | * @bat_priv: the bat priv with all the soft interface information | |
595 | * @type: tvlv handler type to look for | |
596 | * @version: tvlv handler version to look for | |
597 | * | |
598 | * Returns tvlv handler if found or NULL otherwise. | |
599 | */ | |
600 | static struct batadv_tvlv_handler | |
601 | *batadv_tvlv_handler_get(struct batadv_priv *bat_priv, | |
602 | uint8_t type, uint8_t version) | |
603 | { | |
604 | struct batadv_tvlv_handler *tvlv_handler_tmp, *tvlv_handler = NULL; | |
605 | ||
606 | rcu_read_lock(); | |
607 | hlist_for_each_entry_rcu(tvlv_handler_tmp, | |
608 | &bat_priv->tvlv.handler_list, list) { | |
609 | if (tvlv_handler_tmp->type != type) | |
610 | continue; | |
611 | ||
612 | if (tvlv_handler_tmp->version != version) | |
613 | continue; | |
614 | ||
615 | if (!atomic_inc_not_zero(&tvlv_handler_tmp->refcount)) | |
616 | continue; | |
617 | ||
618 | tvlv_handler = tvlv_handler_tmp; | |
619 | break; | |
620 | } | |
621 | rcu_read_unlock(); | |
622 | ||
623 | return tvlv_handler; | |
624 | } | |
625 | ||
626 | /** | |
627 | * batadv_tvlv_container_free_ref - decrement the tvlv container refcounter and | |
628 | * possibly free it | |
629 | * @tvlv_handler: the tvlv container to free | |
630 | */ | |
631 | static void batadv_tvlv_container_free_ref(struct batadv_tvlv_container *tvlv) | |
632 | { | |
633 | if (atomic_dec_and_test(&tvlv->refcount)) | |
634 | kfree(tvlv); | |
635 | } | |
636 | ||
637 | /** | |
638 | * batadv_tvlv_container_get - retrieve tvlv container from the tvlv container | |
639 | * list based on the provided type and version (both need to match) | |
640 | * @bat_priv: the bat priv with all the soft interface information | |
641 | * @type: tvlv container type to look for | |
642 | * @version: tvlv container version to look for | |
643 | * | |
644 | * Has to be called with the appropriate locks being acquired | |
645 | * (tvlv.container_list_lock). | |
646 | * | |
647 | * Returns tvlv container if found or NULL otherwise. | |
648 | */ | |
649 | static struct batadv_tvlv_container | |
650 | *batadv_tvlv_container_get(struct batadv_priv *bat_priv, | |
651 | uint8_t type, uint8_t version) | |
652 | { | |
653 | struct batadv_tvlv_container *tvlv_tmp, *tvlv = NULL; | |
654 | ||
655 | hlist_for_each_entry(tvlv_tmp, &bat_priv->tvlv.container_list, list) { | |
656 | if (tvlv_tmp->tvlv_hdr.type != type) | |
657 | continue; | |
658 | ||
659 | if (tvlv_tmp->tvlv_hdr.version != version) | |
660 | continue; | |
661 | ||
662 | if (!atomic_inc_not_zero(&tvlv_tmp->refcount)) | |
663 | continue; | |
664 | ||
665 | tvlv = tvlv_tmp; | |
666 | break; | |
667 | } | |
668 | ||
669 | return tvlv; | |
670 | } | |
671 | ||
672 | /** | |
673 | * batadv_tvlv_container_list_size - calculate the size of the tvlv container | |
674 | * list entries | |
675 | * @bat_priv: the bat priv with all the soft interface information | |
676 | * | |
677 | * Has to be called with the appropriate locks being acquired | |
678 | * (tvlv.container_list_lock). | |
679 | * | |
680 | * Returns size of all currently registered tvlv containers in bytes. | |
681 | */ | |
682 | static uint16_t batadv_tvlv_container_list_size(struct batadv_priv *bat_priv) | |
683 | { | |
684 | struct batadv_tvlv_container *tvlv; | |
685 | uint16_t tvlv_len = 0; | |
686 | ||
687 | hlist_for_each_entry(tvlv, &bat_priv->tvlv.container_list, list) { | |
688 | tvlv_len += sizeof(struct batadv_tvlv_hdr); | |
689 | tvlv_len += ntohs(tvlv->tvlv_hdr.len); | |
690 | } | |
691 | ||
692 | return tvlv_len; | |
693 | } | |
694 | ||
695 | /** | |
696 | * batadv_tvlv_container_remove - remove tvlv container from the tvlv container | |
697 | * list | |
698 | * @tvlv: the to be removed tvlv container | |
699 | * | |
700 | * Has to be called with the appropriate locks being acquired | |
701 | * (tvlv.container_list_lock). | |
702 | */ | |
703 | static void batadv_tvlv_container_remove(struct batadv_tvlv_container *tvlv) | |
704 | { | |
705 | if (!tvlv) | |
706 | return; | |
707 | ||
708 | hlist_del(&tvlv->list); | |
709 | ||
710 | /* first call to decrement the counter, second call to free */ | |
711 | batadv_tvlv_container_free_ref(tvlv); | |
712 | batadv_tvlv_container_free_ref(tvlv); | |
713 | } | |
714 | ||
715 | /** | |
716 | * batadv_tvlv_container_unregister - unregister tvlv container based on the | |
717 | * provided type and version (both need to match) | |
718 | * @bat_priv: the bat priv with all the soft interface information | |
719 | * @type: tvlv container type to unregister | |
720 | * @version: tvlv container type to unregister | |
721 | */ | |
722 | void batadv_tvlv_container_unregister(struct batadv_priv *bat_priv, | |
723 | uint8_t type, uint8_t version) | |
724 | { | |
725 | struct batadv_tvlv_container *tvlv; | |
726 | ||
727 | spin_lock_bh(&bat_priv->tvlv.container_list_lock); | |
728 | tvlv = batadv_tvlv_container_get(bat_priv, type, version); | |
729 | batadv_tvlv_container_remove(tvlv); | |
730 | spin_unlock_bh(&bat_priv->tvlv.container_list_lock); | |
731 | } | |
732 | ||
733 | /** | |
734 | * batadv_tvlv_container_register - register tvlv type, version and content | |
735 | * to be propagated with each (primary interface) OGM | |
736 | * @bat_priv: the bat priv with all the soft interface information | |
737 | * @type: tvlv container type | |
738 | * @version: tvlv container version | |
739 | * @tvlv_value: tvlv container content | |
740 | * @tvlv_value_len: tvlv container content length | |
741 | * | |
742 | * If a container of the same type and version was already registered the new | |
743 | * content is going to replace the old one. | |
744 | */ | |
745 | void batadv_tvlv_container_register(struct batadv_priv *bat_priv, | |
746 | uint8_t type, uint8_t version, | |
747 | void *tvlv_value, uint16_t tvlv_value_len) | |
748 | { | |
749 | struct batadv_tvlv_container *tvlv_old, *tvlv_new; | |
750 | ||
751 | if (!tvlv_value) | |
752 | tvlv_value_len = 0; | |
753 | ||
754 | tvlv_new = kzalloc(sizeof(*tvlv_new) + tvlv_value_len, GFP_ATOMIC); | |
755 | if (!tvlv_new) | |
756 | return; | |
757 | ||
758 | tvlv_new->tvlv_hdr.version = version; | |
759 | tvlv_new->tvlv_hdr.type = type; | |
760 | tvlv_new->tvlv_hdr.len = htons(tvlv_value_len); | |
761 | ||
762 | memcpy(tvlv_new + 1, tvlv_value, ntohs(tvlv_new->tvlv_hdr.len)); | |
763 | INIT_HLIST_NODE(&tvlv_new->list); | |
764 | atomic_set(&tvlv_new->refcount, 1); | |
765 | ||
766 | spin_lock_bh(&bat_priv->tvlv.container_list_lock); | |
767 | tvlv_old = batadv_tvlv_container_get(bat_priv, type, version); | |
768 | batadv_tvlv_container_remove(tvlv_old); | |
769 | hlist_add_head(&tvlv_new->list, &bat_priv->tvlv.container_list); | |
770 | spin_unlock_bh(&bat_priv->tvlv.container_list_lock); | |
771 | } | |
772 | ||
773 | /** | |
774 | * batadv_tvlv_realloc_packet_buff - reallocate packet buffer to accomodate | |
775 | * requested packet size | |
776 | * @packet_buff: packet buffer | |
777 | * @packet_buff_len: packet buffer size | |
778 | * @packet_min_len: requested packet minimum size | |
779 | * @additional_packet_len: requested additional packet size on top of minimum | |
780 | * size | |
781 | * | |
782 | * Returns true of the packet buffer could be changed to the requested size, | |
783 | * false otherwise. | |
784 | */ | |
785 | static bool batadv_tvlv_realloc_packet_buff(unsigned char **packet_buff, | |
786 | int *packet_buff_len, | |
787 | int min_packet_len, | |
788 | int additional_packet_len) | |
789 | { | |
790 | unsigned char *new_buff; | |
791 | ||
792 | new_buff = kmalloc(min_packet_len + additional_packet_len, GFP_ATOMIC); | |
793 | ||
794 | /* keep old buffer if kmalloc should fail */ | |
795 | if (new_buff) { | |
796 | memcpy(new_buff, *packet_buff, min_packet_len); | |
797 | kfree(*packet_buff); | |
798 | *packet_buff = new_buff; | |
799 | *packet_buff_len = min_packet_len + additional_packet_len; | |
800 | return true; | |
801 | } | |
802 | ||
803 | return false; | |
804 | } | |
805 | ||
806 | /** | |
807 | * batadv_tvlv_container_ogm_append - append tvlv container content to given | |
808 | * OGM packet buffer | |
809 | * @bat_priv: the bat priv with all the soft interface information | |
810 | * @packet_buff: ogm packet buffer | |
811 | * @packet_buff_len: ogm packet buffer size including ogm header and tvlv | |
812 | * content | |
813 | * @packet_min_len: ogm header size to be preserved for the OGM itself | |
814 | * | |
815 | * The ogm packet might be enlarged or shrunk depending on the current size | |
816 | * and the size of the to-be-appended tvlv containers. | |
817 | * | |
818 | * Returns size of all appended tvlv containers in bytes. | |
819 | */ | |
820 | uint16_t batadv_tvlv_container_ogm_append(struct batadv_priv *bat_priv, | |
821 | unsigned char **packet_buff, | |
822 | int *packet_buff_len, | |
823 | int packet_min_len) | |
824 | { | |
825 | struct batadv_tvlv_container *tvlv; | |
826 | struct batadv_tvlv_hdr *tvlv_hdr; | |
827 | uint16_t tvlv_value_len; | |
828 | void *tvlv_value; | |
829 | bool ret; | |
830 | ||
831 | spin_lock_bh(&bat_priv->tvlv.container_list_lock); | |
832 | tvlv_value_len = batadv_tvlv_container_list_size(bat_priv); | |
833 | ||
834 | ret = batadv_tvlv_realloc_packet_buff(packet_buff, packet_buff_len, | |
835 | packet_min_len, tvlv_value_len); | |
836 | ||
837 | if (!ret) | |
838 | goto end; | |
839 | ||
840 | if (!tvlv_value_len) | |
841 | goto end; | |
842 | ||
843 | tvlv_value = (*packet_buff) + packet_min_len; | |
844 | ||
845 | hlist_for_each_entry(tvlv, &bat_priv->tvlv.container_list, list) { | |
846 | tvlv_hdr = tvlv_value; | |
847 | tvlv_hdr->type = tvlv->tvlv_hdr.type; | |
848 | tvlv_hdr->version = tvlv->tvlv_hdr.version; | |
849 | tvlv_hdr->len = tvlv->tvlv_hdr.len; | |
850 | tvlv_value = tvlv_hdr + 1; | |
851 | memcpy(tvlv_value, tvlv + 1, ntohs(tvlv->tvlv_hdr.len)); | |
852 | tvlv_value = (uint8_t *)tvlv_value + ntohs(tvlv->tvlv_hdr.len); | |
853 | } | |
854 | ||
855 | end: | |
856 | spin_unlock_bh(&bat_priv->tvlv.container_list_lock); | |
857 | return tvlv_value_len; | |
858 | } | |
859 | ||
860 | /** | |
861 | * batadv_tvlv_call_handler - parse the given tvlv buffer to call the | |
862 | * appropriate handlers | |
863 | * @bat_priv: the bat priv with all the soft interface information | |
864 | * @tvlv_handler: tvlv callback function handling the tvlv content | |
865 | * @ogm_source: flag indicating wether the tvlv is an ogm or a unicast packet | |
866 | * @orig_node: orig node emitting the ogm packet | |
867 | * @src: source mac address of the unicast packet | |
868 | * @dst: destination mac address of the unicast packet | |
869 | * @tvlv_value: tvlv content | |
870 | * @tvlv_value_len: tvlv content length | |
871 | * | |
872 | * Returns success if handler was not found or the return value of the handler | |
873 | * callback. | |
874 | */ | |
875 | static int batadv_tvlv_call_handler(struct batadv_priv *bat_priv, | |
876 | struct batadv_tvlv_handler *tvlv_handler, | |
877 | bool ogm_source, | |
878 | struct batadv_orig_node *orig_node, | |
879 | uint8_t *src, uint8_t *dst, | |
880 | void *tvlv_value, uint16_t tvlv_value_len) | |
881 | { | |
882 | if (!tvlv_handler) | |
883 | return NET_RX_SUCCESS; | |
884 | ||
885 | if (ogm_source) { | |
886 | if (!tvlv_handler->ogm_handler) | |
887 | return NET_RX_SUCCESS; | |
888 | ||
889 | if (!orig_node) | |
890 | return NET_RX_SUCCESS; | |
891 | ||
892 | tvlv_handler->ogm_handler(bat_priv, orig_node, | |
893 | BATADV_NO_FLAGS, | |
894 | tvlv_value, tvlv_value_len); | |
895 | tvlv_handler->flags |= BATADV_TVLV_HANDLER_OGM_CALLED; | |
896 | } else { | |
897 | if (!src) | |
898 | return NET_RX_SUCCESS; | |
899 | ||
900 | if (!dst) | |
901 | return NET_RX_SUCCESS; | |
902 | ||
903 | if (!tvlv_handler->unicast_handler) | |
904 | return NET_RX_SUCCESS; | |
905 | ||
906 | return tvlv_handler->unicast_handler(bat_priv, src, | |
907 | dst, tvlv_value, | |
908 | tvlv_value_len); | |
909 | } | |
910 | ||
911 | return NET_RX_SUCCESS; | |
912 | } | |
913 | ||
914 | /** | |
915 | * batadv_tvlv_containers_process - parse the given tvlv buffer to call the | |
916 | * appropriate handlers | |
917 | * @bat_priv: the bat priv with all the soft interface information | |
918 | * @ogm_source: flag indicating wether the tvlv is an ogm or a unicast packet | |
919 | * @orig_node: orig node emitting the ogm packet | |
920 | * @src: source mac address of the unicast packet | |
921 | * @dst: destination mac address of the unicast packet | |
922 | * @tvlv_value: tvlv content | |
923 | * @tvlv_value_len: tvlv content length | |
924 | * | |
925 | * Returns success when processing an OGM or the return value of all called | |
926 | * handler callbacks. | |
927 | */ | |
928 | int batadv_tvlv_containers_process(struct batadv_priv *bat_priv, | |
929 | bool ogm_source, | |
930 | struct batadv_orig_node *orig_node, | |
931 | uint8_t *src, uint8_t *dst, | |
932 | void *tvlv_value, uint16_t tvlv_value_len) | |
933 | { | |
934 | struct batadv_tvlv_handler *tvlv_handler; | |
935 | struct batadv_tvlv_hdr *tvlv_hdr; | |
936 | uint16_t tvlv_value_cont_len; | |
937 | uint8_t cifnotfound = BATADV_TVLV_HANDLER_OGM_CIFNOTFND; | |
938 | int ret = NET_RX_SUCCESS; | |
939 | ||
940 | while (tvlv_value_len >= sizeof(*tvlv_hdr)) { | |
941 | tvlv_hdr = tvlv_value; | |
942 | tvlv_value_cont_len = ntohs(tvlv_hdr->len); | |
943 | tvlv_value = tvlv_hdr + 1; | |
944 | tvlv_value_len -= sizeof(*tvlv_hdr); | |
945 | ||
946 | if (tvlv_value_cont_len > tvlv_value_len) | |
947 | break; | |
948 | ||
949 | tvlv_handler = batadv_tvlv_handler_get(bat_priv, | |
950 | tvlv_hdr->type, | |
951 | tvlv_hdr->version); | |
952 | ||
953 | ret |= batadv_tvlv_call_handler(bat_priv, tvlv_handler, | |
954 | ogm_source, orig_node, | |
955 | src, dst, tvlv_value, | |
956 | tvlv_value_cont_len); | |
957 | if (tvlv_handler) | |
958 | batadv_tvlv_handler_free_ref(tvlv_handler); | |
959 | tvlv_value = (uint8_t *)tvlv_value + tvlv_value_cont_len; | |
960 | tvlv_value_len -= tvlv_value_cont_len; | |
961 | } | |
962 | ||
963 | if (!ogm_source) | |
964 | return ret; | |
965 | ||
966 | rcu_read_lock(); | |
967 | hlist_for_each_entry_rcu(tvlv_handler, | |
968 | &bat_priv->tvlv.handler_list, list) { | |
969 | if ((tvlv_handler->flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND) && | |
970 | !(tvlv_handler->flags & BATADV_TVLV_HANDLER_OGM_CALLED)) | |
971 | tvlv_handler->ogm_handler(bat_priv, orig_node, | |
972 | cifnotfound, NULL, 0); | |
973 | ||
974 | tvlv_handler->flags &= ~BATADV_TVLV_HANDLER_OGM_CALLED; | |
975 | } | |
976 | rcu_read_unlock(); | |
977 | ||
978 | return NET_RX_SUCCESS; | |
979 | } | |
980 | ||
981 | /** | |
982 | * batadv_tvlv_ogm_receive - process an incoming ogm and call the appropriate | |
983 | * handlers | |
984 | * @bat_priv: the bat priv with all the soft interface information | |
985 | * @batadv_ogm_packet: ogm packet containing the tvlv containers | |
986 | * @orig_node: orig node emitting the ogm packet | |
987 | */ | |
988 | void batadv_tvlv_ogm_receive(struct batadv_priv *bat_priv, | |
989 | struct batadv_ogm_packet *batadv_ogm_packet, | |
990 | struct batadv_orig_node *orig_node) | |
991 | { | |
992 | void *tvlv_value; | |
993 | uint16_t tvlv_value_len; | |
994 | ||
995 | if (!batadv_ogm_packet) | |
996 | return; | |
997 | ||
998 | tvlv_value_len = ntohs(batadv_ogm_packet->tvlv_len); | |
999 | if (!tvlv_value_len) | |
1000 | return; | |
1001 | ||
1002 | tvlv_value = batadv_ogm_packet + 1; | |
1003 | ||
1004 | batadv_tvlv_containers_process(bat_priv, true, orig_node, NULL, NULL, | |
1005 | tvlv_value, tvlv_value_len); | |
1006 | } | |
1007 | ||
1008 | /** | |
1009 | * batadv_tvlv_handler_register - register tvlv handler based on the provided | |
1010 | * type and version (both need to match) for ogm tvlv payload and/or unicast | |
1011 | * payload | |
1012 | * @bat_priv: the bat priv with all the soft interface information | |
1013 | * @optr: ogm tvlv handler callback function. This function receives the orig | |
1014 | * node, flags and the tvlv content as argument to process. | |
1015 | * @uptr: unicast tvlv handler callback function. This function receives the | |
1016 | * source & destination of the unicast packet as well as the tvlv content | |
1017 | * to process. | |
1018 | * @type: tvlv handler type to be registered | |
1019 | * @version: tvlv handler version to be registered | |
1020 | * @flags: flags to enable or disable TVLV API behavior | |
1021 | */ | |
1022 | void batadv_tvlv_handler_register(struct batadv_priv *bat_priv, | |
1023 | void (*optr)(struct batadv_priv *bat_priv, | |
1024 | struct batadv_orig_node *orig, | |
1025 | uint8_t flags, | |
1026 | void *tvlv_value, | |
1027 | uint16_t tvlv_value_len), | |
1028 | int (*uptr)(struct batadv_priv *bat_priv, | |
1029 | uint8_t *src, uint8_t *dst, | |
1030 | void *tvlv_value, | |
1031 | uint16_t tvlv_value_len), | |
1032 | uint8_t type, uint8_t version, uint8_t flags) | |
1033 | { | |
1034 | struct batadv_tvlv_handler *tvlv_handler; | |
1035 | ||
1036 | tvlv_handler = batadv_tvlv_handler_get(bat_priv, type, version); | |
1037 | if (tvlv_handler) { | |
1038 | batadv_tvlv_handler_free_ref(tvlv_handler); | |
1039 | return; | |
1040 | } | |
1041 | ||
1042 | tvlv_handler = kzalloc(sizeof(*tvlv_handler), GFP_ATOMIC); | |
1043 | if (!tvlv_handler) | |
1044 | return; | |
1045 | ||
1046 | tvlv_handler->ogm_handler = optr; | |
1047 | tvlv_handler->unicast_handler = uptr; | |
1048 | tvlv_handler->type = type; | |
1049 | tvlv_handler->version = version; | |
1050 | tvlv_handler->flags = flags; | |
1051 | atomic_set(&tvlv_handler->refcount, 1); | |
1052 | INIT_HLIST_NODE(&tvlv_handler->list); | |
1053 | ||
1054 | spin_lock_bh(&bat_priv->tvlv.handler_list_lock); | |
1055 | hlist_add_head_rcu(&tvlv_handler->list, &bat_priv->tvlv.handler_list); | |
1056 | spin_unlock_bh(&bat_priv->tvlv.handler_list_lock); | |
1057 | } | |
1058 | ||
1059 | /** | |
1060 | * batadv_tvlv_handler_unregister - unregister tvlv handler based on the | |
1061 | * provided type and version (both need to match) | |
1062 | * @bat_priv: the bat priv with all the soft interface information | |
1063 | * @type: tvlv handler type to be unregistered | |
1064 | * @version: tvlv handler version to be unregistered | |
1065 | */ | |
1066 | void batadv_tvlv_handler_unregister(struct batadv_priv *bat_priv, | |
1067 | uint8_t type, uint8_t version) | |
1068 | { | |
1069 | struct batadv_tvlv_handler *tvlv_handler; | |
1070 | ||
1071 | tvlv_handler = batadv_tvlv_handler_get(bat_priv, type, version); | |
1072 | if (!tvlv_handler) | |
1073 | return; | |
1074 | ||
1075 | batadv_tvlv_handler_free_ref(tvlv_handler); | |
1076 | spin_lock_bh(&bat_priv->tvlv.handler_list_lock); | |
1077 | hlist_del_rcu(&tvlv_handler->list); | |
1078 | spin_unlock_bh(&bat_priv->tvlv.handler_list_lock); | |
1079 | batadv_tvlv_handler_free_ref(tvlv_handler); | |
1080 | } | |
1081 | ||
1082 | /** | |
1083 | * batadv_tvlv_unicast_send - send a unicast packet with tvlv payload to the | |
1084 | * specified host | |
1085 | * @bat_priv: the bat priv with all the soft interface information | |
1086 | * @src: source mac address of the unicast packet | |
1087 | * @dst: destination mac address of the unicast packet | |
1088 | * @type: tvlv type | |
1089 | * @version: tvlv version | |
1090 | * @tvlv_value: tvlv content | |
1091 | * @tvlv_value_len: tvlv content length | |
1092 | */ | |
1093 | void batadv_tvlv_unicast_send(struct batadv_priv *bat_priv, uint8_t *src, | |
1094 | uint8_t *dst, uint8_t type, uint8_t version, | |
1095 | void *tvlv_value, uint16_t tvlv_value_len) | |
1096 | { | |
1097 | struct batadv_unicast_tvlv_packet *unicast_tvlv_packet; | |
1098 | struct batadv_tvlv_hdr *tvlv_hdr; | |
1099 | struct batadv_orig_node *orig_node; | |
1100 | struct sk_buff *skb = NULL; | |
1101 | unsigned char *tvlv_buff; | |
1102 | unsigned int tvlv_len; | |
1103 | ssize_t hdr_len = sizeof(*unicast_tvlv_packet); | |
1104 | bool ret = false; | |
1105 | ||
1106 | orig_node = batadv_orig_hash_find(bat_priv, dst); | |
1107 | if (!orig_node) | |
1108 | goto out; | |
1109 | ||
1110 | tvlv_len = sizeof(*tvlv_hdr) + tvlv_value_len; | |
1111 | ||
1112 | skb = netdev_alloc_skb_ip_align(NULL, ETH_HLEN + hdr_len + tvlv_len); | |
1113 | if (!skb) | |
1114 | goto out; | |
1115 | ||
1116 | skb->priority = TC_PRIO_CONTROL; | |
1117 | skb_reserve(skb, ETH_HLEN); | |
1118 | tvlv_buff = skb_put(skb, sizeof(*unicast_tvlv_packet) + tvlv_len); | |
1119 | unicast_tvlv_packet = (struct batadv_unicast_tvlv_packet *)tvlv_buff; | |
1120 | unicast_tvlv_packet->header.packet_type = BATADV_UNICAST_TVLV; | |
1121 | unicast_tvlv_packet->header.version = BATADV_COMPAT_VERSION; | |
1122 | unicast_tvlv_packet->header.ttl = BATADV_TTL; | |
1123 | unicast_tvlv_packet->reserved = 0; | |
1124 | unicast_tvlv_packet->tvlv_len = htons(tvlv_len); | |
1125 | unicast_tvlv_packet->align = 0; | |
1126 | memcpy(unicast_tvlv_packet->src, src, ETH_ALEN); | |
1127 | memcpy(unicast_tvlv_packet->dst, dst, ETH_ALEN); | |
1128 | ||
1129 | tvlv_buff = (unsigned char *)(unicast_tvlv_packet + 1); | |
1130 | tvlv_hdr = (struct batadv_tvlv_hdr *)tvlv_buff; | |
1131 | tvlv_hdr->version = version; | |
1132 | tvlv_hdr->type = type; | |
1133 | tvlv_hdr->len = htons(tvlv_value_len); | |
1134 | tvlv_buff += sizeof(*tvlv_hdr); | |
1135 | memcpy(tvlv_buff, tvlv_value, tvlv_value_len); | |
1136 | ||
1137 | if (batadv_send_skb_to_orig(skb, orig_node, NULL) != NET_XMIT_DROP) | |
1138 | ret = true; | |
1139 | ||
1140 | out: | |
1141 | if (skb && !ret) | |
1142 | kfree_skb(skb); | |
1143 | if (orig_node) | |
1144 | batadv_orig_node_free_ref(orig_node); | |
1145 | } | |
1146 | ||
c018ad3d AQ |
1147 | /** |
1148 | * batadv_get_vid - extract the VLAN identifier from skb if any | |
1149 | * @skb: the buffer containing the packet | |
1150 | * @header_len: length of the batman header preceding the ethernet header | |
1151 | * | |
1152 | * If the packet embedded in the skb is vlan tagged this function returns the | |
1153 | * VID with the BATADV_VLAN_HAS_TAG flag. Otherwise BATADV_NO_FLAGS is returned. | |
1154 | */ | |
1155 | unsigned short batadv_get_vid(struct sk_buff *skb, size_t header_len) | |
1156 | { | |
1157 | struct ethhdr *ethhdr = (struct ethhdr *)(skb->data + header_len); | |
1158 | struct vlan_ethhdr *vhdr; | |
1159 | unsigned short vid; | |
1160 | ||
1161 | if (ethhdr->h_proto != htons(ETH_P_8021Q)) | |
1162 | return BATADV_NO_FLAGS; | |
1163 | ||
1164 | if (!pskb_may_pull(skb, header_len + VLAN_ETH_HLEN)) | |
1165 | return BATADV_NO_FLAGS; | |
1166 | ||
1167 | vhdr = (struct vlan_ethhdr *)(skb->data + header_len); | |
1168 | vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK; | |
1169 | vid |= BATADV_VLAN_HAS_TAG; | |
1170 | ||
1171 | return vid; | |
1172 | } | |
1173 | ||
ee11ad61 | 1174 | static int batadv_param_set_ra(const char *val, const struct kernel_param *kp) |
d419be1f | 1175 | { |
56303d34 | 1176 | struct batadv_algo_ops *bat_algo_ops; |
d8cb5486 ML |
1177 | char *algo_name = (char *)val; |
1178 | size_t name_len = strlen(algo_name); | |
d419be1f | 1179 | |
293c9c1c | 1180 | if (name_len > 0 && algo_name[name_len - 1] == '\n') |
d8cb5486 ML |
1181 | algo_name[name_len - 1] = '\0'; |
1182 | ||
ee11ad61 | 1183 | bat_algo_ops = batadv_algo_get(algo_name); |
d419be1f | 1184 | if (!bat_algo_ops) { |
d8cb5486 | 1185 | pr_err("Routing algorithm '%s' is not supported\n", algo_name); |
d419be1f ML |
1186 | return -EINVAL; |
1187 | } | |
1188 | ||
d8cb5486 | 1189 | return param_set_copystring(algo_name, kp); |
d419be1f ML |
1190 | } |
1191 | ||
ee11ad61 SE |
1192 | static const struct kernel_param_ops batadv_param_ops_ra = { |
1193 | .set = batadv_param_set_ra, | |
d419be1f ML |
1194 | .get = param_get_string, |
1195 | }; | |
1196 | ||
ee11ad61 | 1197 | static struct kparam_string batadv_param_string_ra = { |
3193e8fd SE |
1198 | .maxlen = sizeof(batadv_routing_algo), |
1199 | .string = batadv_routing_algo, | |
d419be1f ML |
1200 | }; |
1201 | ||
ee11ad61 SE |
1202 | module_param_cb(routing_algo, &batadv_param_ops_ra, &batadv_param_string_ra, |
1203 | 0644); | |
1204 | module_init(batadv_init); | |
1205 | module_exit(batadv_exit); | |
c6c8fea2 SE |
1206 | |
1207 | MODULE_LICENSE("GPL"); | |
1208 | ||
42d0b044 SE |
1209 | MODULE_AUTHOR(BATADV_DRIVER_AUTHOR); |
1210 | MODULE_DESCRIPTION(BATADV_DRIVER_DESC); | |
1211 | MODULE_SUPPORTED_DEVICE(BATADV_DRIVER_DEVICE); | |
1212 | MODULE_VERSION(BATADV_SOURCE_VERSION); |