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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); | |
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); | |
ef261577 ML |
124 | INIT_HLIST_HEAD(&bat_priv->tvlv.container_list); |
125 | INIT_HLIST_HEAD(&bat_priv->tvlv.handler_list); | |
5d2c05b2 | 126 | INIT_HLIST_HEAD(&bat_priv->softif_vlan_list); |
c6c8fea2 | 127 | |
7d211efc | 128 | ret = batadv_originator_init(bat_priv); |
5346c35e | 129 | if (ret < 0) |
c6c8fea2 SE |
130 | goto err; |
131 | ||
08c36d3e | 132 | ret = batadv_tt_init(bat_priv); |
5346c35e | 133 | if (ret < 0) |
c6c8fea2 SE |
134 | goto err; |
135 | ||
08adf151 | 136 | ret = batadv_bla_init(bat_priv); |
5346c35e | 137 | if (ret < 0) |
23721387 SW |
138 | goto err; |
139 | ||
2f1dfbe1 AQ |
140 | ret = batadv_dat_init(bat_priv); |
141 | if (ret < 0) | |
142 | goto err; | |
143 | ||
6c519bad | 144 | ret = batadv_nc_mesh_init(bat_priv); |
d353d8d4 MH |
145 | if (ret < 0) |
146 | goto err; | |
147 | ||
414254e3 ML |
148 | batadv_gw_init(bat_priv); |
149 | ||
807736f6 | 150 | atomic_set(&bat_priv->gw.reselect, 0); |
39c75a51 | 151 | atomic_set(&bat_priv->mesh_state, BATADV_MESH_ACTIVE); |
5346c35e SE |
152 | |
153 | return 0; | |
c6c8fea2 SE |
154 | |
155 | err: | |
3193e8fd | 156 | batadv_mesh_free(soft_iface); |
5346c35e | 157 | return ret; |
c6c8fea2 SE |
158 | } |
159 | ||
3193e8fd | 160 | void batadv_mesh_free(struct net_device *soft_iface) |
c6c8fea2 | 161 | { |
56303d34 | 162 | struct batadv_priv *bat_priv = netdev_priv(soft_iface); |
c6c8fea2 | 163 | |
39c75a51 | 164 | atomic_set(&bat_priv->mesh_state, BATADV_MESH_DEACTIVATING); |
c6c8fea2 | 165 | |
9455e34c | 166 | batadv_purge_outstanding_packets(bat_priv, NULL); |
c6c8fea2 | 167 | |
7cf06bc6 | 168 | batadv_gw_node_purge(bat_priv); |
6c519bad | 169 | batadv_nc_mesh_free(bat_priv); |
a4361860 AQ |
170 | batadv_dat_free(bat_priv); |
171 | batadv_bla_free(bat_priv); | |
c6c8fea2 | 172 | |
a4361860 AQ |
173 | /* Free the TT and the originator tables only after having terminated |
174 | * all the other depending components which may use these structures for | |
175 | * their purposes. | |
176 | */ | |
08c36d3e | 177 | batadv_tt_free(bat_priv); |
c6c8fea2 | 178 | |
a4361860 AQ |
179 | /* Since the originator table clean up routine is accessing the TT |
180 | * tables as well, it has to be invoked after the TT tables have been | |
181 | * freed and marked as empty. This ensures that no cleanup RCU callbacks | |
182 | * accessing the TT data are scheduled for later execution. | |
183 | */ | |
184 | batadv_originator_free(bat_priv); | |
2f1dfbe1 | 185 | |
414254e3 ML |
186 | batadv_gw_free(bat_priv); |
187 | ||
f8214865 | 188 | free_percpu(bat_priv->bat_counters); |
f69ae770 | 189 | bat_priv->bat_counters = NULL; |
f8214865 | 190 | |
39c75a51 | 191 | atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE); |
c6c8fea2 SE |
192 | } |
193 | ||
6e0895c2 DM |
194 | /** |
195 | * batadv_is_my_mac - check if the given mac address belongs to any of the real | |
196 | * interfaces in the current mesh | |
197 | * @bat_priv: the bat priv with all the soft interface information | |
198 | * @addr: the address to check | |
199 | */ | |
fe8a93b9 | 200 | int batadv_is_my_mac(struct batadv_priv *bat_priv, const uint8_t *addr) |
c6c8fea2 | 201 | { |
56303d34 | 202 | const struct batadv_hard_iface *hard_iface; |
c6c8fea2 SE |
203 | |
204 | rcu_read_lock(); | |
3193e8fd | 205 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e9a4f295 | 206 | if (hard_iface->if_status != BATADV_IF_ACTIVE) |
c6c8fea2 SE |
207 | continue; |
208 | ||
fe8a93b9 AQ |
209 | if (hard_iface->soft_iface != bat_priv->soft_iface) |
210 | continue; | |
211 | ||
1eda58bf | 212 | if (batadv_compare_eth(hard_iface->net_dev->dev_addr, addr)) { |
c6c8fea2 SE |
213 | rcu_read_unlock(); |
214 | return 1; | |
215 | } | |
216 | } | |
217 | rcu_read_unlock(); | |
218 | return 0; | |
c6c8fea2 SE |
219 | } |
220 | ||
30da63a6 ML |
221 | /** |
222 | * batadv_seq_print_text_primary_if_get - called from debugfs table printing | |
223 | * function that requires the primary interface | |
224 | * @seq: debugfs table seq_file struct | |
225 | * | |
226 | * Returns primary interface if found or NULL otherwise. | |
227 | */ | |
228 | struct batadv_hard_iface * | |
229 | batadv_seq_print_text_primary_if_get(struct seq_file *seq) | |
230 | { | |
231 | struct net_device *net_dev = (struct net_device *)seq->private; | |
232 | struct batadv_priv *bat_priv = netdev_priv(net_dev); | |
233 | struct batadv_hard_iface *primary_if; | |
234 | ||
235 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
236 | ||
237 | if (!primary_if) { | |
238 | seq_printf(seq, | |
239 | "BATMAN mesh %s disabled - please specify interfaces to enable it\n", | |
240 | net_dev->name); | |
241 | goto out; | |
242 | } | |
243 | ||
244 | if (primary_if->if_status == BATADV_IF_ACTIVE) | |
245 | goto out; | |
246 | ||
247 | seq_printf(seq, | |
248 | "BATMAN mesh %s disabled - primary interface not active\n", | |
249 | net_dev->name); | |
250 | batadv_hardif_free_ref(primary_if); | |
251 | primary_if = NULL; | |
252 | ||
253 | out: | |
254 | return primary_if; | |
255 | } | |
256 | ||
411d6ed9 ML |
257 | /** |
258 | * batadv_max_header_len - calculate maximum encapsulation overhead for a | |
259 | * payload packet | |
260 | * | |
261 | * Return the maximum encapsulation overhead in bytes. | |
262 | */ | |
263 | int batadv_max_header_len(void) | |
264 | { | |
265 | int header_len = 0; | |
266 | ||
267 | header_len = max_t(int, header_len, | |
268 | sizeof(struct batadv_unicast_packet)); | |
269 | header_len = max_t(int, header_len, | |
270 | sizeof(struct batadv_unicast_4addr_packet)); | |
271 | header_len = max_t(int, header_len, | |
272 | sizeof(struct batadv_bcast_packet)); | |
273 | ||
274 | #ifdef CONFIG_BATMAN_ADV_NC | |
275 | header_len = max_t(int, header_len, | |
276 | sizeof(struct batadv_coded_packet)); | |
277 | #endif | |
278 | ||
279 | return header_len; | |
280 | } | |
281 | ||
c54f38c9 SW |
282 | /** |
283 | * batadv_skb_set_priority - sets skb priority according to packet content | |
284 | * @skb: the packet to be sent | |
285 | * @offset: offset to the packet content | |
286 | * | |
287 | * This function sets a value between 256 and 263 (802.1d priority), which | |
288 | * can be interpreted by the cfg80211 or other drivers. | |
289 | */ | |
290 | void batadv_skb_set_priority(struct sk_buff *skb, int offset) | |
291 | { | |
292 | struct iphdr ip_hdr_tmp, *ip_hdr; | |
293 | struct ipv6hdr ip6_hdr_tmp, *ip6_hdr; | |
294 | struct ethhdr ethhdr_tmp, *ethhdr; | |
295 | struct vlan_ethhdr *vhdr, vhdr_tmp; | |
296 | u32 prio; | |
297 | ||
298 | /* already set, do nothing */ | |
299 | if (skb->priority >= 256 && skb->priority <= 263) | |
300 | return; | |
301 | ||
302 | ethhdr = skb_header_pointer(skb, offset, sizeof(*ethhdr), ðhdr_tmp); | |
303 | if (!ethhdr) | |
304 | return; | |
305 | ||
306 | switch (ethhdr->h_proto) { | |
307 | case htons(ETH_P_8021Q): | |
308 | vhdr = skb_header_pointer(skb, offset + sizeof(*vhdr), | |
309 | sizeof(*vhdr), &vhdr_tmp); | |
310 | if (!vhdr) | |
311 | return; | |
312 | prio = ntohs(vhdr->h_vlan_TCI) & VLAN_PRIO_MASK; | |
313 | prio = prio >> VLAN_PRIO_SHIFT; | |
314 | break; | |
315 | case htons(ETH_P_IP): | |
316 | ip_hdr = skb_header_pointer(skb, offset + sizeof(*ethhdr), | |
317 | sizeof(*ip_hdr), &ip_hdr_tmp); | |
318 | if (!ip_hdr) | |
319 | return; | |
320 | prio = (ipv4_get_dsfield(ip_hdr) & 0xfc) >> 5; | |
321 | break; | |
322 | case htons(ETH_P_IPV6): | |
323 | ip6_hdr = skb_header_pointer(skb, offset + sizeof(*ethhdr), | |
324 | sizeof(*ip6_hdr), &ip6_hdr_tmp); | |
325 | if (!ip6_hdr) | |
326 | return; | |
327 | prio = (ipv6_get_dsfield(ip6_hdr) & 0xfc) >> 5; | |
328 | break; | |
329 | default: | |
330 | return; | |
331 | } | |
332 | ||
333 | skb->priority = prio + 256; | |
334 | } | |
335 | ||
ee11ad61 | 336 | static int batadv_recv_unhandled_packet(struct sk_buff *skb, |
56303d34 | 337 | struct batadv_hard_iface *recv_if) |
ffa995e0 ML |
338 | { |
339 | return NET_RX_DROP; | |
340 | } | |
341 | ||
342 | /* incoming packets with the batman ethertype received on any active hard | |
343 | * interface | |
344 | */ | |
3193e8fd SE |
345 | int batadv_batman_skb_recv(struct sk_buff *skb, struct net_device *dev, |
346 | struct packet_type *ptype, | |
347 | struct net_device *orig_dev) | |
ffa995e0 | 348 | { |
56303d34 | 349 | struct batadv_priv *bat_priv; |
96412690 | 350 | struct batadv_ogm_packet *batadv_ogm_packet; |
56303d34 | 351 | struct batadv_hard_iface *hard_iface; |
ffa995e0 ML |
352 | uint8_t idx; |
353 | int ret; | |
354 | ||
56303d34 SE |
355 | hard_iface = container_of(ptype, struct batadv_hard_iface, |
356 | batman_adv_ptype); | |
ffa995e0 ML |
357 | skb = skb_share_check(skb, GFP_ATOMIC); |
358 | ||
359 | /* skb was released by skb_share_check() */ | |
360 | if (!skb) | |
361 | goto err_out; | |
362 | ||
363 | /* packet should hold at least type and version */ | |
364 | if (unlikely(!pskb_may_pull(skb, 2))) | |
365 | goto err_free; | |
366 | ||
367 | /* expect a valid ethernet header here. */ | |
368 | if (unlikely(skb->mac_len != ETH_HLEN || !skb_mac_header(skb))) | |
369 | goto err_free; | |
370 | ||
371 | if (!hard_iface->soft_iface) | |
372 | goto err_free; | |
373 | ||
374 | bat_priv = netdev_priv(hard_iface->soft_iface); | |
375 | ||
39c75a51 | 376 | if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) |
ffa995e0 ML |
377 | goto err_free; |
378 | ||
379 | /* discard frames on not active interfaces */ | |
e9a4f295 | 380 | if (hard_iface->if_status != BATADV_IF_ACTIVE) |
ffa995e0 ML |
381 | goto err_free; |
382 | ||
96412690 | 383 | batadv_ogm_packet = (struct batadv_ogm_packet *)skb->data; |
ffa995e0 | 384 | |
96412690 | 385 | if (batadv_ogm_packet->header.version != BATADV_COMPAT_VERSION) { |
39c75a51 | 386 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 387 | "Drop packet: incompatible batman version (%i)\n", |
96412690 | 388 | batadv_ogm_packet->header.version); |
ffa995e0 ML |
389 | goto err_free; |
390 | } | |
391 | ||
392 | /* all receive handlers return whether they received or reused | |
393 | * the supplied skb. if not, we have to free the skb. | |
394 | */ | |
96412690 | 395 | idx = batadv_ogm_packet->header.packet_type; |
ee11ad61 | 396 | ret = (*batadv_rx_handler[idx])(skb, hard_iface); |
ffa995e0 ML |
397 | |
398 | if (ret == NET_RX_DROP) | |
399 | kfree_skb(skb); | |
400 | ||
401 | /* return NET_RX_SUCCESS in any case as we | |
402 | * most probably dropped the packet for | |
403 | * routing-logical reasons. | |
404 | */ | |
405 | return NET_RX_SUCCESS; | |
406 | ||
407 | err_free: | |
408 | kfree_skb(skb); | |
409 | err_out: | |
410 | return NET_RX_DROP; | |
411 | } | |
412 | ||
ee11ad61 | 413 | static void batadv_recv_handler_init(void) |
ffa995e0 ML |
414 | { |
415 | int i; | |
416 | ||
ee11ad61 SE |
417 | for (i = 0; i < ARRAY_SIZE(batadv_rx_handler); i++) |
418 | batadv_rx_handler[i] = batadv_recv_unhandled_packet; | |
ffa995e0 | 419 | |
a1f1ac5c SW |
420 | for (i = BATADV_UNICAST_MIN; i <= BATADV_UNICAST_MAX; i++) |
421 | batadv_rx_handler[i] = batadv_recv_unhandled_unicast_packet; | |
422 | ||
80067c83 SW |
423 | /* compile time checks for struct member offsets */ |
424 | BUILD_BUG_ON(offsetof(struct batadv_unicast_4addr_packet, src) != 10); | |
425 | BUILD_BUG_ON(offsetof(struct batadv_unicast_packet, dest) != 4); | |
80067c83 | 426 | BUILD_BUG_ON(offsetof(struct batadv_unicast_tvlv_packet, dst) != 4); |
610bfc6b | 427 | BUILD_BUG_ON(offsetof(struct batadv_frag_packet, dest) != 4); |
0bf84c16 AQ |
428 | BUILD_BUG_ON(offsetof(struct batadv_icmp_packet, icmph.dst) != 4); |
429 | BUILD_BUG_ON(offsetof(struct batadv_icmp_packet_rr, icmph.dst) != 4); | |
80067c83 | 430 | |
a1f1ac5c SW |
431 | /* broadcast packet */ |
432 | batadv_rx_handler[BATADV_BCAST] = batadv_recv_bcast_packet; | |
433 | ||
434 | /* unicast packets ... */ | |
7cdcf6dd AQ |
435 | /* unicast with 4 addresses packet */ |
436 | batadv_rx_handler[BATADV_UNICAST_4ADDR] = batadv_recv_unicast_packet; | |
ffa995e0 | 437 | /* unicast packet */ |
acd34afa | 438 | batadv_rx_handler[BATADV_UNICAST] = batadv_recv_unicast_packet; |
ef261577 ML |
439 | /* unicast tvlv packet */ |
440 | batadv_rx_handler[BATADV_UNICAST_TVLV] = batadv_recv_unicast_tvlv; | |
a1f1ac5c SW |
441 | /* batman icmp packet */ |
442 | batadv_rx_handler[BATADV_ICMP] = batadv_recv_icmp_packet; | |
610bfc6b MH |
443 | /* Fragmented packets */ |
444 | batadv_rx_handler[BATADV_UNICAST_FRAG] = batadv_recv_frag_packet; | |
ffa995e0 ML |
445 | } |
446 | ||
56303d34 SE |
447 | int |
448 | batadv_recv_handler_register(uint8_t packet_type, | |
449 | int (*recv_handler)(struct sk_buff *, | |
450 | struct batadv_hard_iface *)) | |
ffa995e0 | 451 | { |
a1f1ac5c SW |
452 | int (*curr)(struct sk_buff *, |
453 | struct batadv_hard_iface *); | |
454 | curr = batadv_rx_handler[packet_type]; | |
455 | ||
456 | if ((curr != batadv_recv_unhandled_packet) && | |
457 | (curr != batadv_recv_unhandled_unicast_packet)) | |
ffa995e0 ML |
458 | return -EBUSY; |
459 | ||
ee11ad61 | 460 | batadv_rx_handler[packet_type] = recv_handler; |
ffa995e0 ML |
461 | return 0; |
462 | } | |
463 | ||
3193e8fd | 464 | void batadv_recv_handler_unregister(uint8_t packet_type) |
ffa995e0 | 465 | { |
ee11ad61 | 466 | batadv_rx_handler[packet_type] = batadv_recv_unhandled_packet; |
ffa995e0 ML |
467 | } |
468 | ||
56303d34 | 469 | static struct batadv_algo_ops *batadv_algo_get(char *name) |
1c280471 | 470 | { |
56303d34 | 471 | struct batadv_algo_ops *bat_algo_ops = NULL, *bat_algo_ops_tmp; |
1c280471 | 472 | |
b67bfe0d | 473 | hlist_for_each_entry(bat_algo_ops_tmp, &batadv_algo_list, list) { |
1c280471 ML |
474 | if (strcmp(bat_algo_ops_tmp->name, name) != 0) |
475 | continue; | |
476 | ||
477 | bat_algo_ops = bat_algo_ops_tmp; | |
478 | break; | |
479 | } | |
480 | ||
481 | return bat_algo_ops; | |
482 | } | |
483 | ||
56303d34 | 484 | int batadv_algo_register(struct batadv_algo_ops *bat_algo_ops) |
1c280471 | 485 | { |
56303d34 | 486 | struct batadv_algo_ops *bat_algo_ops_tmp; |
5346c35e | 487 | int ret; |
1c280471 | 488 | |
ee11ad61 | 489 | bat_algo_ops_tmp = batadv_algo_get(bat_algo_ops->name); |
1c280471 | 490 | if (bat_algo_ops_tmp) { |
86ceb360 SE |
491 | pr_info("Trying to register already registered routing algorithm: %s\n", |
492 | bat_algo_ops->name); | |
5346c35e | 493 | ret = -EEXIST; |
1c280471 ML |
494 | goto out; |
495 | } | |
496 | ||
01c4224b | 497 | /* all algorithms must implement all ops (for now) */ |
c2aca022 | 498 | if (!bat_algo_ops->bat_iface_enable || |
00a50076 | 499 | !bat_algo_ops->bat_iface_disable || |
c3229398 | 500 | !bat_algo_ops->bat_iface_update_mac || |
cd8b78e7 | 501 | !bat_algo_ops->bat_primary_iface_set || |
01c4224b | 502 | !bat_algo_ops->bat_ogm_schedule || |
c3e29312 | 503 | !bat_algo_ops->bat_ogm_emit) { |
01c4224b ML |
504 | pr_info("Routing algo '%s' does not implement required ops\n", |
505 | bat_algo_ops->name); | |
5346c35e | 506 | ret = -EINVAL; |
01c4224b ML |
507 | goto out; |
508 | } | |
509 | ||
1c280471 | 510 | INIT_HLIST_NODE(&bat_algo_ops->list); |
ee11ad61 | 511 | hlist_add_head(&bat_algo_ops->list, &batadv_algo_list); |
1c280471 ML |
512 | ret = 0; |
513 | ||
514 | out: | |
515 | return ret; | |
516 | } | |
517 | ||
56303d34 | 518 | int batadv_algo_select(struct batadv_priv *bat_priv, char *name) |
1c280471 | 519 | { |
56303d34 | 520 | struct batadv_algo_ops *bat_algo_ops; |
5346c35e | 521 | int ret = -EINVAL; |
1c280471 | 522 | |
ee11ad61 | 523 | bat_algo_ops = batadv_algo_get(name); |
1c280471 ML |
524 | if (!bat_algo_ops) |
525 | goto out; | |
526 | ||
527 | bat_priv->bat_algo_ops = bat_algo_ops; | |
528 | ret = 0; | |
529 | ||
530 | out: | |
531 | return ret; | |
532 | } | |
533 | ||
3193e8fd | 534 | int batadv_algo_seq_print_text(struct seq_file *seq, void *offset) |
1c280471 | 535 | { |
56303d34 | 536 | struct batadv_algo_ops *bat_algo_ops; |
1c280471 | 537 | |
0c814653 | 538 | seq_puts(seq, "Available routing algorithms:\n"); |
1c280471 | 539 | |
b67bfe0d | 540 | hlist_for_each_entry(bat_algo_ops, &batadv_algo_list, list) { |
1c280471 ML |
541 | seq_printf(seq, "%s\n", bat_algo_ops->name); |
542 | } | |
543 | ||
544 | return 0; | |
545 | } | |
546 | ||
95a066d8 SE |
547 | /** |
548 | * batadv_skb_crc32 - calculate CRC32 of the whole packet and skip bytes in | |
549 | * the header | |
550 | * @skb: skb pointing to fragmented socket buffers | |
551 | * @payload_ptr: Pointer to position inside the head buffer of the skb | |
552 | * marking the start of the data to be CRC'ed | |
553 | * | |
554 | * payload_ptr must always point to an address in the skb head buffer and not to | |
555 | * a fragment. | |
556 | */ | |
557 | __be32 batadv_skb_crc32(struct sk_buff *skb, u8 *payload_ptr) | |
558 | { | |
559 | u32 crc = 0; | |
560 | unsigned int from; | |
561 | unsigned int to = skb->len; | |
562 | struct skb_seq_state st; | |
563 | const u8 *data; | |
564 | unsigned int len; | |
565 | unsigned int consumed = 0; | |
566 | ||
567 | from = (unsigned int)(payload_ptr - skb->data); | |
568 | ||
569 | skb_prepare_seq_read(skb, from, to, &st); | |
570 | while ((len = skb_seq_read(consumed, &data, &st)) != 0) { | |
571 | crc = crc32c(crc, data, len); | |
572 | consumed += len; | |
573 | } | |
95a066d8 SE |
574 | |
575 | return htonl(crc); | |
576 | } | |
577 | ||
ef261577 ML |
578 | /** |
579 | * batadv_tvlv_handler_free_ref - decrement the tvlv handler refcounter and | |
580 | * possibly free it | |
581 | * @tvlv_handler: the tvlv handler to free | |
582 | */ | |
583 | static void | |
584 | batadv_tvlv_handler_free_ref(struct batadv_tvlv_handler *tvlv_handler) | |
585 | { | |
586 | if (atomic_dec_and_test(&tvlv_handler->refcount)) | |
587 | kfree_rcu(tvlv_handler, rcu); | |
588 | } | |
589 | ||
590 | /** | |
591 | * batadv_tvlv_handler_get - retrieve tvlv handler from the tvlv handler list | |
592 | * based on the provided type and version (both need to match) | |
593 | * @bat_priv: the bat priv with all the soft interface information | |
594 | * @type: tvlv handler type to look for | |
595 | * @version: tvlv handler version to look for | |
596 | * | |
597 | * Returns tvlv handler if found or NULL otherwise. | |
598 | */ | |
599 | static struct batadv_tvlv_handler | |
600 | *batadv_tvlv_handler_get(struct batadv_priv *bat_priv, | |
601 | uint8_t type, uint8_t version) | |
602 | { | |
603 | struct batadv_tvlv_handler *tvlv_handler_tmp, *tvlv_handler = NULL; | |
604 | ||
605 | rcu_read_lock(); | |
606 | hlist_for_each_entry_rcu(tvlv_handler_tmp, | |
607 | &bat_priv->tvlv.handler_list, list) { | |
608 | if (tvlv_handler_tmp->type != type) | |
609 | continue; | |
610 | ||
611 | if (tvlv_handler_tmp->version != version) | |
612 | continue; | |
613 | ||
614 | if (!atomic_inc_not_zero(&tvlv_handler_tmp->refcount)) | |
615 | continue; | |
616 | ||
617 | tvlv_handler = tvlv_handler_tmp; | |
618 | break; | |
619 | } | |
620 | rcu_read_unlock(); | |
621 | ||
622 | return tvlv_handler; | |
623 | } | |
624 | ||
625 | /** | |
626 | * batadv_tvlv_container_free_ref - decrement the tvlv container refcounter and | |
627 | * possibly free it | |
628 | * @tvlv_handler: the tvlv container to free | |
629 | */ | |
630 | static void batadv_tvlv_container_free_ref(struct batadv_tvlv_container *tvlv) | |
631 | { | |
632 | if (atomic_dec_and_test(&tvlv->refcount)) | |
633 | kfree(tvlv); | |
634 | } | |
635 | ||
636 | /** | |
637 | * batadv_tvlv_container_get - retrieve tvlv container from the tvlv container | |
638 | * list based on the provided type and version (both need to match) | |
639 | * @bat_priv: the bat priv with all the soft interface information | |
640 | * @type: tvlv container type to look for | |
641 | * @version: tvlv container version to look for | |
642 | * | |
643 | * Has to be called with the appropriate locks being acquired | |
644 | * (tvlv.container_list_lock). | |
645 | * | |
646 | * Returns tvlv container if found or NULL otherwise. | |
647 | */ | |
648 | static struct batadv_tvlv_container | |
649 | *batadv_tvlv_container_get(struct batadv_priv *bat_priv, | |
650 | uint8_t type, uint8_t version) | |
651 | { | |
652 | struct batadv_tvlv_container *tvlv_tmp, *tvlv = NULL; | |
653 | ||
654 | hlist_for_each_entry(tvlv_tmp, &bat_priv->tvlv.container_list, list) { | |
655 | if (tvlv_tmp->tvlv_hdr.type != type) | |
656 | continue; | |
657 | ||
658 | if (tvlv_tmp->tvlv_hdr.version != version) | |
659 | continue; | |
660 | ||
661 | if (!atomic_inc_not_zero(&tvlv_tmp->refcount)) | |
662 | continue; | |
663 | ||
664 | tvlv = tvlv_tmp; | |
665 | break; | |
666 | } | |
667 | ||
668 | return tvlv; | |
669 | } | |
670 | ||
671 | /** | |
672 | * batadv_tvlv_container_list_size - calculate the size of the tvlv container | |
673 | * list entries | |
674 | * @bat_priv: the bat priv with all the soft interface information | |
675 | * | |
676 | * Has to be called with the appropriate locks being acquired | |
677 | * (tvlv.container_list_lock). | |
678 | * | |
679 | * Returns size of all currently registered tvlv containers in bytes. | |
680 | */ | |
681 | static uint16_t batadv_tvlv_container_list_size(struct batadv_priv *bat_priv) | |
682 | { | |
683 | struct batadv_tvlv_container *tvlv; | |
684 | uint16_t tvlv_len = 0; | |
685 | ||
686 | hlist_for_each_entry(tvlv, &bat_priv->tvlv.container_list, list) { | |
687 | tvlv_len += sizeof(struct batadv_tvlv_hdr); | |
688 | tvlv_len += ntohs(tvlv->tvlv_hdr.len); | |
689 | } | |
690 | ||
691 | return tvlv_len; | |
692 | } | |
693 | ||
694 | /** | |
695 | * batadv_tvlv_container_remove - remove tvlv container from the tvlv container | |
696 | * list | |
697 | * @tvlv: the to be removed tvlv container | |
698 | * | |
699 | * Has to be called with the appropriate locks being acquired | |
700 | * (tvlv.container_list_lock). | |
701 | */ | |
702 | static void batadv_tvlv_container_remove(struct batadv_tvlv_container *tvlv) | |
703 | { | |
704 | if (!tvlv) | |
705 | return; | |
706 | ||
707 | hlist_del(&tvlv->list); | |
708 | ||
709 | /* first call to decrement the counter, second call to free */ | |
710 | batadv_tvlv_container_free_ref(tvlv); | |
711 | batadv_tvlv_container_free_ref(tvlv); | |
712 | } | |
713 | ||
714 | /** | |
715 | * batadv_tvlv_container_unregister - unregister tvlv container based on the | |
716 | * provided type and version (both need to match) | |
717 | * @bat_priv: the bat priv with all the soft interface information | |
718 | * @type: tvlv container type to unregister | |
719 | * @version: tvlv container type to unregister | |
720 | */ | |
721 | void batadv_tvlv_container_unregister(struct batadv_priv *bat_priv, | |
722 | uint8_t type, uint8_t version) | |
723 | { | |
724 | struct batadv_tvlv_container *tvlv; | |
725 | ||
726 | spin_lock_bh(&bat_priv->tvlv.container_list_lock); | |
727 | tvlv = batadv_tvlv_container_get(bat_priv, type, version); | |
728 | batadv_tvlv_container_remove(tvlv); | |
729 | spin_unlock_bh(&bat_priv->tvlv.container_list_lock); | |
730 | } | |
731 | ||
732 | /** | |
733 | * batadv_tvlv_container_register - register tvlv type, version and content | |
734 | * to be propagated with each (primary interface) OGM | |
735 | * @bat_priv: the bat priv with all the soft interface information | |
736 | * @type: tvlv container type | |
737 | * @version: tvlv container version | |
738 | * @tvlv_value: tvlv container content | |
739 | * @tvlv_value_len: tvlv container content length | |
740 | * | |
741 | * If a container of the same type and version was already registered the new | |
742 | * content is going to replace the old one. | |
743 | */ | |
744 | void batadv_tvlv_container_register(struct batadv_priv *bat_priv, | |
745 | uint8_t type, uint8_t version, | |
746 | void *tvlv_value, uint16_t tvlv_value_len) | |
747 | { | |
748 | struct batadv_tvlv_container *tvlv_old, *tvlv_new; | |
749 | ||
750 | if (!tvlv_value) | |
751 | tvlv_value_len = 0; | |
752 | ||
753 | tvlv_new = kzalloc(sizeof(*tvlv_new) + tvlv_value_len, GFP_ATOMIC); | |
754 | if (!tvlv_new) | |
755 | return; | |
756 | ||
757 | tvlv_new->tvlv_hdr.version = version; | |
758 | tvlv_new->tvlv_hdr.type = type; | |
759 | tvlv_new->tvlv_hdr.len = htons(tvlv_value_len); | |
760 | ||
761 | memcpy(tvlv_new + 1, tvlv_value, ntohs(tvlv_new->tvlv_hdr.len)); | |
762 | INIT_HLIST_NODE(&tvlv_new->list); | |
763 | atomic_set(&tvlv_new->refcount, 1); | |
764 | ||
765 | spin_lock_bh(&bat_priv->tvlv.container_list_lock); | |
766 | tvlv_old = batadv_tvlv_container_get(bat_priv, type, version); | |
767 | batadv_tvlv_container_remove(tvlv_old); | |
768 | hlist_add_head(&tvlv_new->list, &bat_priv->tvlv.container_list); | |
769 | spin_unlock_bh(&bat_priv->tvlv.container_list_lock); | |
770 | } | |
771 | ||
772 | /** | |
773 | * batadv_tvlv_realloc_packet_buff - reallocate packet buffer to accomodate | |
774 | * requested packet size | |
775 | * @packet_buff: packet buffer | |
776 | * @packet_buff_len: packet buffer size | |
777 | * @packet_min_len: requested packet minimum size | |
778 | * @additional_packet_len: requested additional packet size on top of minimum | |
779 | * size | |
780 | * | |
781 | * Returns true of the packet buffer could be changed to the requested size, | |
782 | * false otherwise. | |
783 | */ | |
784 | static bool batadv_tvlv_realloc_packet_buff(unsigned char **packet_buff, | |
785 | int *packet_buff_len, | |
786 | int min_packet_len, | |
787 | int additional_packet_len) | |
788 | { | |
789 | unsigned char *new_buff; | |
790 | ||
791 | new_buff = kmalloc(min_packet_len + additional_packet_len, GFP_ATOMIC); | |
792 | ||
793 | /* keep old buffer if kmalloc should fail */ | |
794 | if (new_buff) { | |
795 | memcpy(new_buff, *packet_buff, min_packet_len); | |
796 | kfree(*packet_buff); | |
797 | *packet_buff = new_buff; | |
798 | *packet_buff_len = min_packet_len + additional_packet_len; | |
799 | return true; | |
800 | } | |
801 | ||
802 | return false; | |
803 | } | |
804 | ||
805 | /** | |
806 | * batadv_tvlv_container_ogm_append - append tvlv container content to given | |
807 | * OGM packet buffer | |
808 | * @bat_priv: the bat priv with all the soft interface information | |
809 | * @packet_buff: ogm packet buffer | |
810 | * @packet_buff_len: ogm packet buffer size including ogm header and tvlv | |
811 | * content | |
812 | * @packet_min_len: ogm header size to be preserved for the OGM itself | |
813 | * | |
814 | * The ogm packet might be enlarged or shrunk depending on the current size | |
815 | * and the size of the to-be-appended tvlv containers. | |
816 | * | |
817 | * Returns size of all appended tvlv containers in bytes. | |
818 | */ | |
819 | uint16_t batadv_tvlv_container_ogm_append(struct batadv_priv *bat_priv, | |
820 | unsigned char **packet_buff, | |
821 | int *packet_buff_len, | |
822 | int packet_min_len) | |
823 | { | |
824 | struct batadv_tvlv_container *tvlv; | |
825 | struct batadv_tvlv_hdr *tvlv_hdr; | |
826 | uint16_t tvlv_value_len; | |
827 | void *tvlv_value; | |
828 | bool ret; | |
829 | ||
830 | spin_lock_bh(&bat_priv->tvlv.container_list_lock); | |
831 | tvlv_value_len = batadv_tvlv_container_list_size(bat_priv); | |
832 | ||
833 | ret = batadv_tvlv_realloc_packet_buff(packet_buff, packet_buff_len, | |
834 | packet_min_len, tvlv_value_len); | |
835 | ||
836 | if (!ret) | |
837 | goto end; | |
838 | ||
839 | if (!tvlv_value_len) | |
840 | goto end; | |
841 | ||
842 | tvlv_value = (*packet_buff) + packet_min_len; | |
843 | ||
844 | hlist_for_each_entry(tvlv, &bat_priv->tvlv.container_list, list) { | |
845 | tvlv_hdr = tvlv_value; | |
846 | tvlv_hdr->type = tvlv->tvlv_hdr.type; | |
847 | tvlv_hdr->version = tvlv->tvlv_hdr.version; | |
848 | tvlv_hdr->len = tvlv->tvlv_hdr.len; | |
849 | tvlv_value = tvlv_hdr + 1; | |
850 | memcpy(tvlv_value, tvlv + 1, ntohs(tvlv->tvlv_hdr.len)); | |
851 | tvlv_value = (uint8_t *)tvlv_value + ntohs(tvlv->tvlv_hdr.len); | |
852 | } | |
853 | ||
854 | end: | |
855 | spin_unlock_bh(&bat_priv->tvlv.container_list_lock); | |
856 | return tvlv_value_len; | |
857 | } | |
858 | ||
859 | /** | |
860 | * batadv_tvlv_call_handler - parse the given tvlv buffer to call the | |
861 | * appropriate handlers | |
862 | * @bat_priv: the bat priv with all the soft interface information | |
863 | * @tvlv_handler: tvlv callback function handling the tvlv content | |
864 | * @ogm_source: flag indicating wether the tvlv is an ogm or a unicast packet | |
865 | * @orig_node: orig node emitting the ogm packet | |
866 | * @src: source mac address of the unicast packet | |
867 | * @dst: destination mac address of the unicast packet | |
868 | * @tvlv_value: tvlv content | |
869 | * @tvlv_value_len: tvlv content length | |
870 | * | |
871 | * Returns success if handler was not found or the return value of the handler | |
872 | * callback. | |
873 | */ | |
874 | static int batadv_tvlv_call_handler(struct batadv_priv *bat_priv, | |
875 | struct batadv_tvlv_handler *tvlv_handler, | |
876 | bool ogm_source, | |
877 | struct batadv_orig_node *orig_node, | |
878 | uint8_t *src, uint8_t *dst, | |
879 | void *tvlv_value, uint16_t tvlv_value_len) | |
880 | { | |
881 | if (!tvlv_handler) | |
882 | return NET_RX_SUCCESS; | |
883 | ||
884 | if (ogm_source) { | |
885 | if (!tvlv_handler->ogm_handler) | |
886 | return NET_RX_SUCCESS; | |
887 | ||
888 | if (!orig_node) | |
889 | return NET_RX_SUCCESS; | |
890 | ||
891 | tvlv_handler->ogm_handler(bat_priv, orig_node, | |
892 | BATADV_NO_FLAGS, | |
893 | tvlv_value, tvlv_value_len); | |
894 | tvlv_handler->flags |= BATADV_TVLV_HANDLER_OGM_CALLED; | |
895 | } else { | |
896 | if (!src) | |
897 | return NET_RX_SUCCESS; | |
898 | ||
899 | if (!dst) | |
900 | return NET_RX_SUCCESS; | |
901 | ||
902 | if (!tvlv_handler->unicast_handler) | |
903 | return NET_RX_SUCCESS; | |
904 | ||
905 | return tvlv_handler->unicast_handler(bat_priv, src, | |
906 | dst, tvlv_value, | |
907 | tvlv_value_len); | |
908 | } | |
909 | ||
910 | return NET_RX_SUCCESS; | |
911 | } | |
912 | ||
913 | /** | |
914 | * batadv_tvlv_containers_process - parse the given tvlv buffer to call the | |
915 | * appropriate handlers | |
916 | * @bat_priv: the bat priv with all the soft interface information | |
917 | * @ogm_source: flag indicating wether the tvlv is an ogm or a unicast packet | |
918 | * @orig_node: orig node emitting the ogm packet | |
919 | * @src: source mac address of the unicast packet | |
920 | * @dst: destination mac address of the unicast packet | |
921 | * @tvlv_value: tvlv content | |
922 | * @tvlv_value_len: tvlv content length | |
923 | * | |
924 | * Returns success when processing an OGM or the return value of all called | |
925 | * handler callbacks. | |
926 | */ | |
927 | int batadv_tvlv_containers_process(struct batadv_priv *bat_priv, | |
928 | bool ogm_source, | |
929 | struct batadv_orig_node *orig_node, | |
930 | uint8_t *src, uint8_t *dst, | |
931 | void *tvlv_value, uint16_t tvlv_value_len) | |
932 | { | |
933 | struct batadv_tvlv_handler *tvlv_handler; | |
934 | struct batadv_tvlv_hdr *tvlv_hdr; | |
935 | uint16_t tvlv_value_cont_len; | |
936 | uint8_t cifnotfound = BATADV_TVLV_HANDLER_OGM_CIFNOTFND; | |
937 | int ret = NET_RX_SUCCESS; | |
938 | ||
939 | while (tvlv_value_len >= sizeof(*tvlv_hdr)) { | |
940 | tvlv_hdr = tvlv_value; | |
941 | tvlv_value_cont_len = ntohs(tvlv_hdr->len); | |
942 | tvlv_value = tvlv_hdr + 1; | |
943 | tvlv_value_len -= sizeof(*tvlv_hdr); | |
944 | ||
945 | if (tvlv_value_cont_len > tvlv_value_len) | |
946 | break; | |
947 | ||
948 | tvlv_handler = batadv_tvlv_handler_get(bat_priv, | |
949 | tvlv_hdr->type, | |
950 | tvlv_hdr->version); | |
951 | ||
952 | ret |= batadv_tvlv_call_handler(bat_priv, tvlv_handler, | |
953 | ogm_source, orig_node, | |
954 | src, dst, tvlv_value, | |
955 | tvlv_value_cont_len); | |
956 | if (tvlv_handler) | |
957 | batadv_tvlv_handler_free_ref(tvlv_handler); | |
958 | tvlv_value = (uint8_t *)tvlv_value + tvlv_value_cont_len; | |
959 | tvlv_value_len -= tvlv_value_cont_len; | |
960 | } | |
961 | ||
962 | if (!ogm_source) | |
963 | return ret; | |
964 | ||
965 | rcu_read_lock(); | |
966 | hlist_for_each_entry_rcu(tvlv_handler, | |
967 | &bat_priv->tvlv.handler_list, list) { | |
968 | if ((tvlv_handler->flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND) && | |
969 | !(tvlv_handler->flags & BATADV_TVLV_HANDLER_OGM_CALLED)) | |
970 | tvlv_handler->ogm_handler(bat_priv, orig_node, | |
971 | cifnotfound, NULL, 0); | |
972 | ||
973 | tvlv_handler->flags &= ~BATADV_TVLV_HANDLER_OGM_CALLED; | |
974 | } | |
975 | rcu_read_unlock(); | |
976 | ||
977 | return NET_RX_SUCCESS; | |
978 | } | |
979 | ||
980 | /** | |
981 | * batadv_tvlv_ogm_receive - process an incoming ogm and call the appropriate | |
982 | * handlers | |
983 | * @bat_priv: the bat priv with all the soft interface information | |
984 | * @batadv_ogm_packet: ogm packet containing the tvlv containers | |
985 | * @orig_node: orig node emitting the ogm packet | |
986 | */ | |
987 | void batadv_tvlv_ogm_receive(struct batadv_priv *bat_priv, | |
988 | struct batadv_ogm_packet *batadv_ogm_packet, | |
989 | struct batadv_orig_node *orig_node) | |
990 | { | |
991 | void *tvlv_value; | |
992 | uint16_t tvlv_value_len; | |
993 | ||
994 | if (!batadv_ogm_packet) | |
995 | return; | |
996 | ||
997 | tvlv_value_len = ntohs(batadv_ogm_packet->tvlv_len); | |
998 | if (!tvlv_value_len) | |
999 | return; | |
1000 | ||
1001 | tvlv_value = batadv_ogm_packet + 1; | |
1002 | ||
1003 | batadv_tvlv_containers_process(bat_priv, true, orig_node, NULL, NULL, | |
1004 | tvlv_value, tvlv_value_len); | |
1005 | } | |
1006 | ||
1007 | /** | |
1008 | * batadv_tvlv_handler_register - register tvlv handler based on the provided | |
1009 | * type and version (both need to match) for ogm tvlv payload and/or unicast | |
1010 | * payload | |
1011 | * @bat_priv: the bat priv with all the soft interface information | |
1012 | * @optr: ogm tvlv handler callback function. This function receives the orig | |
1013 | * node, flags and the tvlv content as argument to process. | |
1014 | * @uptr: unicast tvlv handler callback function. This function receives the | |
1015 | * source & destination of the unicast packet as well as the tvlv content | |
1016 | * to process. | |
1017 | * @type: tvlv handler type to be registered | |
1018 | * @version: tvlv handler version to be registered | |
1019 | * @flags: flags to enable or disable TVLV API behavior | |
1020 | */ | |
1021 | void batadv_tvlv_handler_register(struct batadv_priv *bat_priv, | |
1022 | void (*optr)(struct batadv_priv *bat_priv, | |
1023 | struct batadv_orig_node *orig, | |
1024 | uint8_t flags, | |
1025 | void *tvlv_value, | |
1026 | uint16_t tvlv_value_len), | |
1027 | int (*uptr)(struct batadv_priv *bat_priv, | |
1028 | uint8_t *src, uint8_t *dst, | |
1029 | void *tvlv_value, | |
1030 | uint16_t tvlv_value_len), | |
1031 | uint8_t type, uint8_t version, uint8_t flags) | |
1032 | { | |
1033 | struct batadv_tvlv_handler *tvlv_handler; | |
1034 | ||
1035 | tvlv_handler = batadv_tvlv_handler_get(bat_priv, type, version); | |
1036 | if (tvlv_handler) { | |
1037 | batadv_tvlv_handler_free_ref(tvlv_handler); | |
1038 | return; | |
1039 | } | |
1040 | ||
1041 | tvlv_handler = kzalloc(sizeof(*tvlv_handler), GFP_ATOMIC); | |
1042 | if (!tvlv_handler) | |
1043 | return; | |
1044 | ||
1045 | tvlv_handler->ogm_handler = optr; | |
1046 | tvlv_handler->unicast_handler = uptr; | |
1047 | tvlv_handler->type = type; | |
1048 | tvlv_handler->version = version; | |
1049 | tvlv_handler->flags = flags; | |
1050 | atomic_set(&tvlv_handler->refcount, 1); | |
1051 | INIT_HLIST_NODE(&tvlv_handler->list); | |
1052 | ||
1053 | spin_lock_bh(&bat_priv->tvlv.handler_list_lock); | |
1054 | hlist_add_head_rcu(&tvlv_handler->list, &bat_priv->tvlv.handler_list); | |
1055 | spin_unlock_bh(&bat_priv->tvlv.handler_list_lock); | |
1056 | } | |
1057 | ||
1058 | /** | |
1059 | * batadv_tvlv_handler_unregister - unregister tvlv handler based on the | |
1060 | * provided type and version (both need to match) | |
1061 | * @bat_priv: the bat priv with all the soft interface information | |
1062 | * @type: tvlv handler type to be unregistered | |
1063 | * @version: tvlv handler version to be unregistered | |
1064 | */ | |
1065 | void batadv_tvlv_handler_unregister(struct batadv_priv *bat_priv, | |
1066 | uint8_t type, uint8_t version) | |
1067 | { | |
1068 | struct batadv_tvlv_handler *tvlv_handler; | |
1069 | ||
1070 | tvlv_handler = batadv_tvlv_handler_get(bat_priv, type, version); | |
1071 | if (!tvlv_handler) | |
1072 | return; | |
1073 | ||
1074 | batadv_tvlv_handler_free_ref(tvlv_handler); | |
1075 | spin_lock_bh(&bat_priv->tvlv.handler_list_lock); | |
1076 | hlist_del_rcu(&tvlv_handler->list); | |
1077 | spin_unlock_bh(&bat_priv->tvlv.handler_list_lock); | |
1078 | batadv_tvlv_handler_free_ref(tvlv_handler); | |
1079 | } | |
1080 | ||
1081 | /** | |
1082 | * batadv_tvlv_unicast_send - send a unicast packet with tvlv payload to the | |
1083 | * specified host | |
1084 | * @bat_priv: the bat priv with all the soft interface information | |
1085 | * @src: source mac address of the unicast packet | |
1086 | * @dst: destination mac address of the unicast packet | |
1087 | * @type: tvlv type | |
1088 | * @version: tvlv version | |
1089 | * @tvlv_value: tvlv content | |
1090 | * @tvlv_value_len: tvlv content length | |
1091 | */ | |
1092 | void batadv_tvlv_unicast_send(struct batadv_priv *bat_priv, uint8_t *src, | |
1093 | uint8_t *dst, uint8_t type, uint8_t version, | |
1094 | void *tvlv_value, uint16_t tvlv_value_len) | |
1095 | { | |
1096 | struct batadv_unicast_tvlv_packet *unicast_tvlv_packet; | |
1097 | struct batadv_tvlv_hdr *tvlv_hdr; | |
1098 | struct batadv_orig_node *orig_node; | |
1099 | struct sk_buff *skb = NULL; | |
1100 | unsigned char *tvlv_buff; | |
1101 | unsigned int tvlv_len; | |
1102 | ssize_t hdr_len = sizeof(*unicast_tvlv_packet); | |
1103 | bool ret = false; | |
1104 | ||
1105 | orig_node = batadv_orig_hash_find(bat_priv, dst); | |
1106 | if (!orig_node) | |
1107 | goto out; | |
1108 | ||
1109 | tvlv_len = sizeof(*tvlv_hdr) + tvlv_value_len; | |
1110 | ||
1111 | skb = netdev_alloc_skb_ip_align(NULL, ETH_HLEN + hdr_len + tvlv_len); | |
1112 | if (!skb) | |
1113 | goto out; | |
1114 | ||
1115 | skb->priority = TC_PRIO_CONTROL; | |
1116 | skb_reserve(skb, ETH_HLEN); | |
1117 | tvlv_buff = skb_put(skb, sizeof(*unicast_tvlv_packet) + tvlv_len); | |
1118 | unicast_tvlv_packet = (struct batadv_unicast_tvlv_packet *)tvlv_buff; | |
1119 | unicast_tvlv_packet->header.packet_type = BATADV_UNICAST_TVLV; | |
1120 | unicast_tvlv_packet->header.version = BATADV_COMPAT_VERSION; | |
1121 | unicast_tvlv_packet->header.ttl = BATADV_TTL; | |
1122 | unicast_tvlv_packet->reserved = 0; | |
1123 | unicast_tvlv_packet->tvlv_len = htons(tvlv_len); | |
1124 | unicast_tvlv_packet->align = 0; | |
1125 | memcpy(unicast_tvlv_packet->src, src, ETH_ALEN); | |
1126 | memcpy(unicast_tvlv_packet->dst, dst, ETH_ALEN); | |
1127 | ||
1128 | tvlv_buff = (unsigned char *)(unicast_tvlv_packet + 1); | |
1129 | tvlv_hdr = (struct batadv_tvlv_hdr *)tvlv_buff; | |
1130 | tvlv_hdr->version = version; | |
1131 | tvlv_hdr->type = type; | |
1132 | tvlv_hdr->len = htons(tvlv_value_len); | |
1133 | tvlv_buff += sizeof(*tvlv_hdr); | |
1134 | memcpy(tvlv_buff, tvlv_value, tvlv_value_len); | |
1135 | ||
1136 | if (batadv_send_skb_to_orig(skb, orig_node, NULL) != NET_XMIT_DROP) | |
1137 | ret = true; | |
1138 | ||
1139 | out: | |
1140 | if (skb && !ret) | |
1141 | kfree_skb(skb); | |
1142 | if (orig_node) | |
1143 | batadv_orig_node_free_ref(orig_node); | |
1144 | } | |
1145 | ||
c018ad3d AQ |
1146 | /** |
1147 | * batadv_get_vid - extract the VLAN identifier from skb if any | |
1148 | * @skb: the buffer containing the packet | |
1149 | * @header_len: length of the batman header preceding the ethernet header | |
1150 | * | |
1151 | * If the packet embedded in the skb is vlan tagged this function returns the | |
1152 | * VID with the BATADV_VLAN_HAS_TAG flag. Otherwise BATADV_NO_FLAGS is returned. | |
1153 | */ | |
1154 | unsigned short batadv_get_vid(struct sk_buff *skb, size_t header_len) | |
1155 | { | |
1156 | struct ethhdr *ethhdr = (struct ethhdr *)(skb->data + header_len); | |
1157 | struct vlan_ethhdr *vhdr; | |
1158 | unsigned short vid; | |
1159 | ||
1160 | if (ethhdr->h_proto != htons(ETH_P_8021Q)) | |
1161 | return BATADV_NO_FLAGS; | |
1162 | ||
1163 | if (!pskb_may_pull(skb, header_len + VLAN_ETH_HLEN)) | |
1164 | return BATADV_NO_FLAGS; | |
1165 | ||
1166 | vhdr = (struct vlan_ethhdr *)(skb->data + header_len); | |
1167 | vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK; | |
1168 | vid |= BATADV_VLAN_HAS_TAG; | |
1169 | ||
1170 | return vid; | |
1171 | } | |
1172 | ||
ee11ad61 | 1173 | static int batadv_param_set_ra(const char *val, const struct kernel_param *kp) |
d419be1f | 1174 | { |
56303d34 | 1175 | struct batadv_algo_ops *bat_algo_ops; |
d8cb5486 ML |
1176 | char *algo_name = (char *)val; |
1177 | size_t name_len = strlen(algo_name); | |
d419be1f | 1178 | |
293c9c1c | 1179 | if (name_len > 0 && algo_name[name_len - 1] == '\n') |
d8cb5486 ML |
1180 | algo_name[name_len - 1] = '\0'; |
1181 | ||
ee11ad61 | 1182 | bat_algo_ops = batadv_algo_get(algo_name); |
d419be1f | 1183 | if (!bat_algo_ops) { |
d8cb5486 | 1184 | pr_err("Routing algorithm '%s' is not supported\n", algo_name); |
d419be1f ML |
1185 | return -EINVAL; |
1186 | } | |
1187 | ||
d8cb5486 | 1188 | return param_set_copystring(algo_name, kp); |
d419be1f ML |
1189 | } |
1190 | ||
ee11ad61 SE |
1191 | static const struct kernel_param_ops batadv_param_ops_ra = { |
1192 | .set = batadv_param_set_ra, | |
d419be1f ML |
1193 | .get = param_get_string, |
1194 | }; | |
1195 | ||
ee11ad61 | 1196 | static struct kparam_string batadv_param_string_ra = { |
3193e8fd SE |
1197 | .maxlen = sizeof(batadv_routing_algo), |
1198 | .string = batadv_routing_algo, | |
d419be1f ML |
1199 | }; |
1200 | ||
ee11ad61 SE |
1201 | module_param_cb(routing_algo, &batadv_param_ops_ra, &batadv_param_string_ra, |
1202 | 0644); | |
1203 | module_init(batadv_init); | |
1204 | module_exit(batadv_exit); | |
c6c8fea2 SE |
1205 | |
1206 | MODULE_LICENSE("GPL"); | |
1207 | ||
42d0b044 SE |
1208 | MODULE_AUTHOR(BATADV_DRIVER_AUTHOR); |
1209 | MODULE_DESCRIPTION(BATADV_DRIVER_DESC); | |
1210 | MODULE_SUPPORTED_DEVICE(BATADV_DRIVER_DEVICE); | |
1211 | MODULE_VERSION(BATADV_SOURCE_VERSION); |