Commit | Line | Data |
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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" |
c6c8fea2 | 43 | |
c3caf519 SE |
44 | |
45 | /* List manipulations on hardif_list have to be rtnl_lock()'ed, | |
9cfc7bd6 SE |
46 | * list traversals just rcu-locked |
47 | */ | |
3193e8fd | 48 | struct list_head batadv_hardif_list; |
ee11ad61 | 49 | static int (*batadv_rx_handler[256])(struct sk_buff *, |
56303d34 | 50 | struct batadv_hard_iface *); |
3193e8fd | 51 | char batadv_routing_algo[20] = "BATMAN_IV"; |
ee11ad61 | 52 | static struct hlist_head batadv_algo_list; |
c6c8fea2 | 53 | |
3193e8fd | 54 | unsigned char batadv_broadcast_addr[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; |
c6c8fea2 | 55 | |
3193e8fd | 56 | struct workqueue_struct *batadv_event_workqueue; |
c6c8fea2 | 57 | |
ee11ad61 | 58 | static void batadv_recv_handler_init(void); |
ffa995e0 | 59 | |
ee11ad61 | 60 | static int __init batadv_init(void) |
c6c8fea2 | 61 | { |
3193e8fd | 62 | INIT_LIST_HEAD(&batadv_hardif_list); |
ee11ad61 | 63 | INIT_HLIST_HEAD(&batadv_algo_list); |
1c280471 | 64 | |
ee11ad61 | 65 | batadv_recv_handler_init(); |
ffa995e0 | 66 | |
81c524f7 | 67 | batadv_iv_init(); |
6c519bad | 68 | batadv_nc_init(); |
c6c8fea2 | 69 | |
3193e8fd | 70 | batadv_event_workqueue = create_singlethread_workqueue("bat_events"); |
c6c8fea2 | 71 | |
3193e8fd | 72 | if (!batadv_event_workqueue) |
c6c8fea2 SE |
73 | return -ENOMEM; |
74 | ||
9039dc7e | 75 | batadv_socket_init(); |
40a072d7 | 76 | batadv_debugfs_init(); |
c6c8fea2 | 77 | |
9563877e | 78 | register_netdevice_notifier(&batadv_hard_if_notifier); |
a4ac28c0 | 79 | rtnl_link_register(&batadv_link_ops); |
c6c8fea2 | 80 | |
86ceb360 | 81 | pr_info("B.A.T.M.A.N. advanced %s (compatibility version %i) loaded\n", |
42d0b044 | 82 | BATADV_SOURCE_VERSION, BATADV_COMPAT_VERSION); |
c6c8fea2 SE |
83 | |
84 | return 0; | |
85 | } | |
86 | ||
ee11ad61 | 87 | static void __exit batadv_exit(void) |
c6c8fea2 | 88 | { |
40a072d7 | 89 | batadv_debugfs_destroy(); |
a4ac28c0 | 90 | rtnl_link_unregister(&batadv_link_ops); |
9563877e SE |
91 | unregister_netdevice_notifier(&batadv_hard_if_notifier); |
92 | batadv_hardif_remove_interfaces(); | |
c6c8fea2 | 93 | |
3193e8fd SE |
94 | flush_workqueue(batadv_event_workqueue); |
95 | destroy_workqueue(batadv_event_workqueue); | |
96 | batadv_event_workqueue = NULL; | |
c6c8fea2 SE |
97 | |
98 | rcu_barrier(); | |
99 | } | |
100 | ||
3193e8fd | 101 | int batadv_mesh_init(struct net_device *soft_iface) |
c6c8fea2 | 102 | { |
56303d34 | 103 | struct batadv_priv *bat_priv = netdev_priv(soft_iface); |
5346c35e | 104 | int ret; |
c6c8fea2 | 105 | |
c6c8fea2 SE |
106 | spin_lock_init(&bat_priv->forw_bat_list_lock); |
107 | spin_lock_init(&bat_priv->forw_bcast_list_lock); | |
807736f6 SE |
108 | spin_lock_init(&bat_priv->tt.changes_list_lock); |
109 | spin_lock_init(&bat_priv->tt.req_list_lock); | |
110 | spin_lock_init(&bat_priv->tt.roam_list_lock); | |
111 | spin_lock_init(&bat_priv->tt.last_changeset_lock); | |
112 | spin_lock_init(&bat_priv->gw.list_lock); | |
ef261577 ML |
113 | spin_lock_init(&bat_priv->tvlv.container_list_lock); |
114 | spin_lock_init(&bat_priv->tvlv.handler_list_lock); | |
c6c8fea2 SE |
115 | |
116 | INIT_HLIST_HEAD(&bat_priv->forw_bat_list); | |
117 | INIT_HLIST_HEAD(&bat_priv->forw_bcast_list); | |
807736f6 SE |
118 | INIT_HLIST_HEAD(&bat_priv->gw.list); |
119 | INIT_LIST_HEAD(&bat_priv->tt.changes_list); | |
120 | INIT_LIST_HEAD(&bat_priv->tt.req_list); | |
121 | INIT_LIST_HEAD(&bat_priv->tt.roam_list); | |
ef261577 ML |
122 | INIT_HLIST_HEAD(&bat_priv->tvlv.container_list); |
123 | INIT_HLIST_HEAD(&bat_priv->tvlv.handler_list); | |
c6c8fea2 | 124 | |
7d211efc | 125 | ret = batadv_originator_init(bat_priv); |
5346c35e | 126 | if (ret < 0) |
c6c8fea2 SE |
127 | goto err; |
128 | ||
08c36d3e | 129 | ret = batadv_tt_init(bat_priv); |
5346c35e | 130 | if (ret < 0) |
c6c8fea2 SE |
131 | goto err; |
132 | ||
42d0b044 SE |
133 | batadv_tt_local_add(soft_iface, soft_iface->dev_addr, |
134 | BATADV_NULL_IFINDEX); | |
c6c8fea2 | 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 | ||
c54f38c9 SW |
257 | /** |
258 | * batadv_skb_set_priority - sets skb priority according to packet content | |
259 | * @skb: the packet to be sent | |
260 | * @offset: offset to the packet content | |
261 | * | |
262 | * This function sets a value between 256 and 263 (802.1d priority), which | |
263 | * can be interpreted by the cfg80211 or other drivers. | |
264 | */ | |
265 | void batadv_skb_set_priority(struct sk_buff *skb, int offset) | |
266 | { | |
267 | struct iphdr ip_hdr_tmp, *ip_hdr; | |
268 | struct ipv6hdr ip6_hdr_tmp, *ip6_hdr; | |
269 | struct ethhdr ethhdr_tmp, *ethhdr; | |
270 | struct vlan_ethhdr *vhdr, vhdr_tmp; | |
271 | u32 prio; | |
272 | ||
273 | /* already set, do nothing */ | |
274 | if (skb->priority >= 256 && skb->priority <= 263) | |
275 | return; | |
276 | ||
277 | ethhdr = skb_header_pointer(skb, offset, sizeof(*ethhdr), ðhdr_tmp); | |
278 | if (!ethhdr) | |
279 | return; | |
280 | ||
281 | switch (ethhdr->h_proto) { | |
282 | case htons(ETH_P_8021Q): | |
283 | vhdr = skb_header_pointer(skb, offset + sizeof(*vhdr), | |
284 | sizeof(*vhdr), &vhdr_tmp); | |
285 | if (!vhdr) | |
286 | return; | |
287 | prio = ntohs(vhdr->h_vlan_TCI) & VLAN_PRIO_MASK; | |
288 | prio = prio >> VLAN_PRIO_SHIFT; | |
289 | break; | |
290 | case htons(ETH_P_IP): | |
291 | ip_hdr = skb_header_pointer(skb, offset + sizeof(*ethhdr), | |
292 | sizeof(*ip_hdr), &ip_hdr_tmp); | |
293 | if (!ip_hdr) | |
294 | return; | |
295 | prio = (ipv4_get_dsfield(ip_hdr) & 0xfc) >> 5; | |
296 | break; | |
297 | case htons(ETH_P_IPV6): | |
298 | ip6_hdr = skb_header_pointer(skb, offset + sizeof(*ethhdr), | |
299 | sizeof(*ip6_hdr), &ip6_hdr_tmp); | |
300 | if (!ip6_hdr) | |
301 | return; | |
302 | prio = (ipv6_get_dsfield(ip6_hdr) & 0xfc) >> 5; | |
303 | break; | |
304 | default: | |
305 | return; | |
306 | } | |
307 | ||
308 | skb->priority = prio + 256; | |
309 | } | |
310 | ||
ee11ad61 | 311 | static int batadv_recv_unhandled_packet(struct sk_buff *skb, |
56303d34 | 312 | struct batadv_hard_iface *recv_if) |
ffa995e0 ML |
313 | { |
314 | return NET_RX_DROP; | |
315 | } | |
316 | ||
317 | /* incoming packets with the batman ethertype received on any active hard | |
318 | * interface | |
319 | */ | |
3193e8fd SE |
320 | int batadv_batman_skb_recv(struct sk_buff *skb, struct net_device *dev, |
321 | struct packet_type *ptype, | |
322 | struct net_device *orig_dev) | |
ffa995e0 | 323 | { |
56303d34 | 324 | struct batadv_priv *bat_priv; |
96412690 | 325 | struct batadv_ogm_packet *batadv_ogm_packet; |
56303d34 | 326 | struct batadv_hard_iface *hard_iface; |
ffa995e0 ML |
327 | uint8_t idx; |
328 | int ret; | |
329 | ||
56303d34 SE |
330 | hard_iface = container_of(ptype, struct batadv_hard_iface, |
331 | batman_adv_ptype); | |
ffa995e0 ML |
332 | skb = skb_share_check(skb, GFP_ATOMIC); |
333 | ||
334 | /* skb was released by skb_share_check() */ | |
335 | if (!skb) | |
336 | goto err_out; | |
337 | ||
338 | /* packet should hold at least type and version */ | |
339 | if (unlikely(!pskb_may_pull(skb, 2))) | |
340 | goto err_free; | |
341 | ||
342 | /* expect a valid ethernet header here. */ | |
343 | if (unlikely(skb->mac_len != ETH_HLEN || !skb_mac_header(skb))) | |
344 | goto err_free; | |
345 | ||
346 | if (!hard_iface->soft_iface) | |
347 | goto err_free; | |
348 | ||
349 | bat_priv = netdev_priv(hard_iface->soft_iface); | |
350 | ||
39c75a51 | 351 | if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) |
ffa995e0 ML |
352 | goto err_free; |
353 | ||
354 | /* discard frames on not active interfaces */ | |
e9a4f295 | 355 | if (hard_iface->if_status != BATADV_IF_ACTIVE) |
ffa995e0 ML |
356 | goto err_free; |
357 | ||
96412690 | 358 | batadv_ogm_packet = (struct batadv_ogm_packet *)skb->data; |
ffa995e0 | 359 | |
96412690 | 360 | if (batadv_ogm_packet->header.version != BATADV_COMPAT_VERSION) { |
39c75a51 | 361 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 362 | "Drop packet: incompatible batman version (%i)\n", |
96412690 | 363 | batadv_ogm_packet->header.version); |
ffa995e0 ML |
364 | goto err_free; |
365 | } | |
366 | ||
367 | /* all receive handlers return whether they received or reused | |
368 | * the supplied skb. if not, we have to free the skb. | |
369 | */ | |
96412690 | 370 | idx = batadv_ogm_packet->header.packet_type; |
ee11ad61 | 371 | ret = (*batadv_rx_handler[idx])(skb, hard_iface); |
ffa995e0 ML |
372 | |
373 | if (ret == NET_RX_DROP) | |
374 | kfree_skb(skb); | |
375 | ||
376 | /* return NET_RX_SUCCESS in any case as we | |
377 | * most probably dropped the packet for | |
378 | * routing-logical reasons. | |
379 | */ | |
380 | return NET_RX_SUCCESS; | |
381 | ||
382 | err_free: | |
383 | kfree_skb(skb); | |
384 | err_out: | |
385 | return NET_RX_DROP; | |
386 | } | |
387 | ||
ee11ad61 | 388 | static void batadv_recv_handler_init(void) |
ffa995e0 ML |
389 | { |
390 | int i; | |
391 | ||
ee11ad61 SE |
392 | for (i = 0; i < ARRAY_SIZE(batadv_rx_handler); i++) |
393 | batadv_rx_handler[i] = batadv_recv_unhandled_packet; | |
ffa995e0 | 394 | |
a1f1ac5c SW |
395 | for (i = BATADV_UNICAST_MIN; i <= BATADV_UNICAST_MAX; i++) |
396 | batadv_rx_handler[i] = batadv_recv_unhandled_unicast_packet; | |
397 | ||
80067c83 SW |
398 | /* compile time checks for struct member offsets */ |
399 | BUILD_BUG_ON(offsetof(struct batadv_unicast_4addr_packet, src) != 10); | |
400 | BUILD_BUG_ON(offsetof(struct batadv_unicast_packet, dest) != 4); | |
80067c83 SW |
401 | BUILD_BUG_ON(offsetof(struct batadv_unicast_tvlv_packet, dst) != 4); |
402 | BUILD_BUG_ON(offsetof(struct batadv_icmp_packet, dst) != 4); | |
403 | BUILD_BUG_ON(offsetof(struct batadv_icmp_packet_rr, dst) != 4); | |
404 | ||
a1f1ac5c SW |
405 | /* broadcast packet */ |
406 | batadv_rx_handler[BATADV_BCAST] = batadv_recv_bcast_packet; | |
407 | ||
408 | /* unicast packets ... */ | |
7cdcf6dd AQ |
409 | /* unicast with 4 addresses packet */ |
410 | batadv_rx_handler[BATADV_UNICAST_4ADDR] = batadv_recv_unicast_packet; | |
ffa995e0 | 411 | /* unicast packet */ |
acd34afa | 412 | batadv_rx_handler[BATADV_UNICAST] = batadv_recv_unicast_packet; |
ef261577 ML |
413 | /* unicast tvlv packet */ |
414 | batadv_rx_handler[BATADV_UNICAST_TVLV] = batadv_recv_unicast_tvlv; | |
a1f1ac5c SW |
415 | /* batman icmp packet */ |
416 | batadv_rx_handler[BATADV_ICMP] = batadv_recv_icmp_packet; | |
ffa995e0 ML |
417 | } |
418 | ||
56303d34 SE |
419 | int |
420 | batadv_recv_handler_register(uint8_t packet_type, | |
421 | int (*recv_handler)(struct sk_buff *, | |
422 | struct batadv_hard_iface *)) | |
ffa995e0 | 423 | { |
a1f1ac5c SW |
424 | int (*curr)(struct sk_buff *, |
425 | struct batadv_hard_iface *); | |
426 | curr = batadv_rx_handler[packet_type]; | |
427 | ||
428 | if ((curr != batadv_recv_unhandled_packet) && | |
429 | (curr != batadv_recv_unhandled_unicast_packet)) | |
ffa995e0 ML |
430 | return -EBUSY; |
431 | ||
ee11ad61 | 432 | batadv_rx_handler[packet_type] = recv_handler; |
ffa995e0 ML |
433 | return 0; |
434 | } | |
435 | ||
3193e8fd | 436 | void batadv_recv_handler_unregister(uint8_t packet_type) |
ffa995e0 | 437 | { |
ee11ad61 | 438 | batadv_rx_handler[packet_type] = batadv_recv_unhandled_packet; |
ffa995e0 ML |
439 | } |
440 | ||
56303d34 | 441 | static struct batadv_algo_ops *batadv_algo_get(char *name) |
1c280471 | 442 | { |
56303d34 | 443 | struct batadv_algo_ops *bat_algo_ops = NULL, *bat_algo_ops_tmp; |
1c280471 | 444 | |
b67bfe0d | 445 | hlist_for_each_entry(bat_algo_ops_tmp, &batadv_algo_list, list) { |
1c280471 ML |
446 | if (strcmp(bat_algo_ops_tmp->name, name) != 0) |
447 | continue; | |
448 | ||
449 | bat_algo_ops = bat_algo_ops_tmp; | |
450 | break; | |
451 | } | |
452 | ||
453 | return bat_algo_ops; | |
454 | } | |
455 | ||
56303d34 | 456 | int batadv_algo_register(struct batadv_algo_ops *bat_algo_ops) |
1c280471 | 457 | { |
56303d34 | 458 | struct batadv_algo_ops *bat_algo_ops_tmp; |
5346c35e | 459 | int ret; |
1c280471 | 460 | |
ee11ad61 | 461 | bat_algo_ops_tmp = batadv_algo_get(bat_algo_ops->name); |
1c280471 | 462 | if (bat_algo_ops_tmp) { |
86ceb360 SE |
463 | pr_info("Trying to register already registered routing algorithm: %s\n", |
464 | bat_algo_ops->name); | |
5346c35e | 465 | ret = -EEXIST; |
1c280471 ML |
466 | goto out; |
467 | } | |
468 | ||
01c4224b | 469 | /* all algorithms must implement all ops (for now) */ |
c2aca022 | 470 | if (!bat_algo_ops->bat_iface_enable || |
00a50076 | 471 | !bat_algo_ops->bat_iface_disable || |
c3229398 | 472 | !bat_algo_ops->bat_iface_update_mac || |
cd8b78e7 | 473 | !bat_algo_ops->bat_primary_iface_set || |
01c4224b | 474 | !bat_algo_ops->bat_ogm_schedule || |
c3e29312 | 475 | !bat_algo_ops->bat_ogm_emit) { |
01c4224b ML |
476 | pr_info("Routing algo '%s' does not implement required ops\n", |
477 | bat_algo_ops->name); | |
5346c35e | 478 | ret = -EINVAL; |
01c4224b ML |
479 | goto out; |
480 | } | |
481 | ||
1c280471 | 482 | INIT_HLIST_NODE(&bat_algo_ops->list); |
ee11ad61 | 483 | hlist_add_head(&bat_algo_ops->list, &batadv_algo_list); |
1c280471 ML |
484 | ret = 0; |
485 | ||
486 | out: | |
487 | return ret; | |
488 | } | |
489 | ||
56303d34 | 490 | int batadv_algo_select(struct batadv_priv *bat_priv, char *name) |
1c280471 | 491 | { |
56303d34 | 492 | struct batadv_algo_ops *bat_algo_ops; |
5346c35e | 493 | int ret = -EINVAL; |
1c280471 | 494 | |
ee11ad61 | 495 | bat_algo_ops = batadv_algo_get(name); |
1c280471 ML |
496 | if (!bat_algo_ops) |
497 | goto out; | |
498 | ||
499 | bat_priv->bat_algo_ops = bat_algo_ops; | |
500 | ret = 0; | |
501 | ||
502 | out: | |
503 | return ret; | |
504 | } | |
505 | ||
3193e8fd | 506 | int batadv_algo_seq_print_text(struct seq_file *seq, void *offset) |
1c280471 | 507 | { |
56303d34 | 508 | struct batadv_algo_ops *bat_algo_ops; |
1c280471 | 509 | |
0c814653 | 510 | seq_puts(seq, "Available routing algorithms:\n"); |
1c280471 | 511 | |
b67bfe0d | 512 | hlist_for_each_entry(bat_algo_ops, &batadv_algo_list, list) { |
1c280471 ML |
513 | seq_printf(seq, "%s\n", bat_algo_ops->name); |
514 | } | |
515 | ||
516 | return 0; | |
517 | } | |
518 | ||
95a066d8 SE |
519 | /** |
520 | * batadv_skb_crc32 - calculate CRC32 of the whole packet and skip bytes in | |
521 | * the header | |
522 | * @skb: skb pointing to fragmented socket buffers | |
523 | * @payload_ptr: Pointer to position inside the head buffer of the skb | |
524 | * marking the start of the data to be CRC'ed | |
525 | * | |
526 | * payload_ptr must always point to an address in the skb head buffer and not to | |
527 | * a fragment. | |
528 | */ | |
529 | __be32 batadv_skb_crc32(struct sk_buff *skb, u8 *payload_ptr) | |
530 | { | |
531 | u32 crc = 0; | |
532 | unsigned int from; | |
533 | unsigned int to = skb->len; | |
534 | struct skb_seq_state st; | |
535 | const u8 *data; | |
536 | unsigned int len; | |
537 | unsigned int consumed = 0; | |
538 | ||
539 | from = (unsigned int)(payload_ptr - skb->data); | |
540 | ||
541 | skb_prepare_seq_read(skb, from, to, &st); | |
542 | while ((len = skb_seq_read(consumed, &data, &st)) != 0) { | |
543 | crc = crc32c(crc, data, len); | |
544 | consumed += len; | |
545 | } | |
95a066d8 SE |
546 | |
547 | return htonl(crc); | |
548 | } | |
549 | ||
ef261577 ML |
550 | /** |
551 | * batadv_tvlv_handler_free_ref - decrement the tvlv handler refcounter and | |
552 | * possibly free it | |
553 | * @tvlv_handler: the tvlv handler to free | |
554 | */ | |
555 | static void | |
556 | batadv_tvlv_handler_free_ref(struct batadv_tvlv_handler *tvlv_handler) | |
557 | { | |
558 | if (atomic_dec_and_test(&tvlv_handler->refcount)) | |
559 | kfree_rcu(tvlv_handler, rcu); | |
560 | } | |
561 | ||
562 | /** | |
563 | * batadv_tvlv_handler_get - retrieve tvlv handler from the tvlv handler list | |
564 | * based on the provided type and version (both need to match) | |
565 | * @bat_priv: the bat priv with all the soft interface information | |
566 | * @type: tvlv handler type to look for | |
567 | * @version: tvlv handler version to look for | |
568 | * | |
569 | * Returns tvlv handler if found or NULL otherwise. | |
570 | */ | |
571 | static struct batadv_tvlv_handler | |
572 | *batadv_tvlv_handler_get(struct batadv_priv *bat_priv, | |
573 | uint8_t type, uint8_t version) | |
574 | { | |
575 | struct batadv_tvlv_handler *tvlv_handler_tmp, *tvlv_handler = NULL; | |
576 | ||
577 | rcu_read_lock(); | |
578 | hlist_for_each_entry_rcu(tvlv_handler_tmp, | |
579 | &bat_priv->tvlv.handler_list, list) { | |
580 | if (tvlv_handler_tmp->type != type) | |
581 | continue; | |
582 | ||
583 | if (tvlv_handler_tmp->version != version) | |
584 | continue; | |
585 | ||
586 | if (!atomic_inc_not_zero(&tvlv_handler_tmp->refcount)) | |
587 | continue; | |
588 | ||
589 | tvlv_handler = tvlv_handler_tmp; | |
590 | break; | |
591 | } | |
592 | rcu_read_unlock(); | |
593 | ||
594 | return tvlv_handler; | |
595 | } | |
596 | ||
597 | /** | |
598 | * batadv_tvlv_container_free_ref - decrement the tvlv container refcounter and | |
599 | * possibly free it | |
600 | * @tvlv_handler: the tvlv container to free | |
601 | */ | |
602 | static void batadv_tvlv_container_free_ref(struct batadv_tvlv_container *tvlv) | |
603 | { | |
604 | if (atomic_dec_and_test(&tvlv->refcount)) | |
605 | kfree(tvlv); | |
606 | } | |
607 | ||
608 | /** | |
609 | * batadv_tvlv_container_get - retrieve tvlv container from the tvlv container | |
610 | * list based on the provided type and version (both need to match) | |
611 | * @bat_priv: the bat priv with all the soft interface information | |
612 | * @type: tvlv container type to look for | |
613 | * @version: tvlv container version to look for | |
614 | * | |
615 | * Has to be called with the appropriate locks being acquired | |
616 | * (tvlv.container_list_lock). | |
617 | * | |
618 | * Returns tvlv container if found or NULL otherwise. | |
619 | */ | |
620 | static struct batadv_tvlv_container | |
621 | *batadv_tvlv_container_get(struct batadv_priv *bat_priv, | |
622 | uint8_t type, uint8_t version) | |
623 | { | |
624 | struct batadv_tvlv_container *tvlv_tmp, *tvlv = NULL; | |
625 | ||
626 | hlist_for_each_entry(tvlv_tmp, &bat_priv->tvlv.container_list, list) { | |
627 | if (tvlv_tmp->tvlv_hdr.type != type) | |
628 | continue; | |
629 | ||
630 | if (tvlv_tmp->tvlv_hdr.version != version) | |
631 | continue; | |
632 | ||
633 | if (!atomic_inc_not_zero(&tvlv_tmp->refcount)) | |
634 | continue; | |
635 | ||
636 | tvlv = tvlv_tmp; | |
637 | break; | |
638 | } | |
639 | ||
640 | return tvlv; | |
641 | } | |
642 | ||
643 | /** | |
644 | * batadv_tvlv_container_list_size - calculate the size of the tvlv container | |
645 | * list entries | |
646 | * @bat_priv: the bat priv with all the soft interface information | |
647 | * | |
648 | * Has to be called with the appropriate locks being acquired | |
649 | * (tvlv.container_list_lock). | |
650 | * | |
651 | * Returns size of all currently registered tvlv containers in bytes. | |
652 | */ | |
653 | static uint16_t batadv_tvlv_container_list_size(struct batadv_priv *bat_priv) | |
654 | { | |
655 | struct batadv_tvlv_container *tvlv; | |
656 | uint16_t tvlv_len = 0; | |
657 | ||
658 | hlist_for_each_entry(tvlv, &bat_priv->tvlv.container_list, list) { | |
659 | tvlv_len += sizeof(struct batadv_tvlv_hdr); | |
660 | tvlv_len += ntohs(tvlv->tvlv_hdr.len); | |
661 | } | |
662 | ||
663 | return tvlv_len; | |
664 | } | |
665 | ||
666 | /** | |
667 | * batadv_tvlv_container_remove - remove tvlv container from the tvlv container | |
668 | * list | |
669 | * @tvlv: the to be removed tvlv container | |
670 | * | |
671 | * Has to be called with the appropriate locks being acquired | |
672 | * (tvlv.container_list_lock). | |
673 | */ | |
674 | static void batadv_tvlv_container_remove(struct batadv_tvlv_container *tvlv) | |
675 | { | |
676 | if (!tvlv) | |
677 | return; | |
678 | ||
679 | hlist_del(&tvlv->list); | |
680 | ||
681 | /* first call to decrement the counter, second call to free */ | |
682 | batadv_tvlv_container_free_ref(tvlv); | |
683 | batadv_tvlv_container_free_ref(tvlv); | |
684 | } | |
685 | ||
686 | /** | |
687 | * batadv_tvlv_container_unregister - unregister tvlv container based on the | |
688 | * provided type and version (both need to match) | |
689 | * @bat_priv: the bat priv with all the soft interface information | |
690 | * @type: tvlv container type to unregister | |
691 | * @version: tvlv container type to unregister | |
692 | */ | |
693 | void batadv_tvlv_container_unregister(struct batadv_priv *bat_priv, | |
694 | uint8_t type, uint8_t version) | |
695 | { | |
696 | struct batadv_tvlv_container *tvlv; | |
697 | ||
698 | spin_lock_bh(&bat_priv->tvlv.container_list_lock); | |
699 | tvlv = batadv_tvlv_container_get(bat_priv, type, version); | |
700 | batadv_tvlv_container_remove(tvlv); | |
701 | spin_unlock_bh(&bat_priv->tvlv.container_list_lock); | |
702 | } | |
703 | ||
704 | /** | |
705 | * batadv_tvlv_container_register - register tvlv type, version and content | |
706 | * to be propagated with each (primary interface) OGM | |
707 | * @bat_priv: the bat priv with all the soft interface information | |
708 | * @type: tvlv container type | |
709 | * @version: tvlv container version | |
710 | * @tvlv_value: tvlv container content | |
711 | * @tvlv_value_len: tvlv container content length | |
712 | * | |
713 | * If a container of the same type and version was already registered the new | |
714 | * content is going to replace the old one. | |
715 | */ | |
716 | void batadv_tvlv_container_register(struct batadv_priv *bat_priv, | |
717 | uint8_t type, uint8_t version, | |
718 | void *tvlv_value, uint16_t tvlv_value_len) | |
719 | { | |
720 | struct batadv_tvlv_container *tvlv_old, *tvlv_new; | |
721 | ||
722 | if (!tvlv_value) | |
723 | tvlv_value_len = 0; | |
724 | ||
725 | tvlv_new = kzalloc(sizeof(*tvlv_new) + tvlv_value_len, GFP_ATOMIC); | |
726 | if (!tvlv_new) | |
727 | return; | |
728 | ||
729 | tvlv_new->tvlv_hdr.version = version; | |
730 | tvlv_new->tvlv_hdr.type = type; | |
731 | tvlv_new->tvlv_hdr.len = htons(tvlv_value_len); | |
732 | ||
733 | memcpy(tvlv_new + 1, tvlv_value, ntohs(tvlv_new->tvlv_hdr.len)); | |
734 | INIT_HLIST_NODE(&tvlv_new->list); | |
735 | atomic_set(&tvlv_new->refcount, 1); | |
736 | ||
737 | spin_lock_bh(&bat_priv->tvlv.container_list_lock); | |
738 | tvlv_old = batadv_tvlv_container_get(bat_priv, type, version); | |
739 | batadv_tvlv_container_remove(tvlv_old); | |
740 | hlist_add_head(&tvlv_new->list, &bat_priv->tvlv.container_list); | |
741 | spin_unlock_bh(&bat_priv->tvlv.container_list_lock); | |
742 | } | |
743 | ||
744 | /** | |
745 | * batadv_tvlv_realloc_packet_buff - reallocate packet buffer to accomodate | |
746 | * requested packet size | |
747 | * @packet_buff: packet buffer | |
748 | * @packet_buff_len: packet buffer size | |
749 | * @packet_min_len: requested packet minimum size | |
750 | * @additional_packet_len: requested additional packet size on top of minimum | |
751 | * size | |
752 | * | |
753 | * Returns true of the packet buffer could be changed to the requested size, | |
754 | * false otherwise. | |
755 | */ | |
756 | static bool batadv_tvlv_realloc_packet_buff(unsigned char **packet_buff, | |
757 | int *packet_buff_len, | |
758 | int min_packet_len, | |
759 | int additional_packet_len) | |
760 | { | |
761 | unsigned char *new_buff; | |
762 | ||
763 | new_buff = kmalloc(min_packet_len + additional_packet_len, GFP_ATOMIC); | |
764 | ||
765 | /* keep old buffer if kmalloc should fail */ | |
766 | if (new_buff) { | |
767 | memcpy(new_buff, *packet_buff, min_packet_len); | |
768 | kfree(*packet_buff); | |
769 | *packet_buff = new_buff; | |
770 | *packet_buff_len = min_packet_len + additional_packet_len; | |
771 | return true; | |
772 | } | |
773 | ||
774 | return false; | |
775 | } | |
776 | ||
777 | /** | |
778 | * batadv_tvlv_container_ogm_append - append tvlv container content to given | |
779 | * OGM packet buffer | |
780 | * @bat_priv: the bat priv with all the soft interface information | |
781 | * @packet_buff: ogm packet buffer | |
782 | * @packet_buff_len: ogm packet buffer size including ogm header and tvlv | |
783 | * content | |
784 | * @packet_min_len: ogm header size to be preserved for the OGM itself | |
785 | * | |
786 | * The ogm packet might be enlarged or shrunk depending on the current size | |
787 | * and the size of the to-be-appended tvlv containers. | |
788 | * | |
789 | * Returns size of all appended tvlv containers in bytes. | |
790 | */ | |
791 | uint16_t batadv_tvlv_container_ogm_append(struct batadv_priv *bat_priv, | |
792 | unsigned char **packet_buff, | |
793 | int *packet_buff_len, | |
794 | int packet_min_len) | |
795 | { | |
796 | struct batadv_tvlv_container *tvlv; | |
797 | struct batadv_tvlv_hdr *tvlv_hdr; | |
798 | uint16_t tvlv_value_len; | |
799 | void *tvlv_value; | |
800 | bool ret; | |
801 | ||
802 | spin_lock_bh(&bat_priv->tvlv.container_list_lock); | |
803 | tvlv_value_len = batadv_tvlv_container_list_size(bat_priv); | |
804 | ||
805 | ret = batadv_tvlv_realloc_packet_buff(packet_buff, packet_buff_len, | |
806 | packet_min_len, tvlv_value_len); | |
807 | ||
808 | if (!ret) | |
809 | goto end; | |
810 | ||
811 | if (!tvlv_value_len) | |
812 | goto end; | |
813 | ||
814 | tvlv_value = (*packet_buff) + packet_min_len; | |
815 | ||
816 | hlist_for_each_entry(tvlv, &bat_priv->tvlv.container_list, list) { | |
817 | tvlv_hdr = tvlv_value; | |
818 | tvlv_hdr->type = tvlv->tvlv_hdr.type; | |
819 | tvlv_hdr->version = tvlv->tvlv_hdr.version; | |
820 | tvlv_hdr->len = tvlv->tvlv_hdr.len; | |
821 | tvlv_value = tvlv_hdr + 1; | |
822 | memcpy(tvlv_value, tvlv + 1, ntohs(tvlv->tvlv_hdr.len)); | |
823 | tvlv_value = (uint8_t *)tvlv_value + ntohs(tvlv->tvlv_hdr.len); | |
824 | } | |
825 | ||
826 | end: | |
827 | spin_unlock_bh(&bat_priv->tvlv.container_list_lock); | |
828 | return tvlv_value_len; | |
829 | } | |
830 | ||
831 | /** | |
832 | * batadv_tvlv_call_handler - parse the given tvlv buffer to call the | |
833 | * appropriate handlers | |
834 | * @bat_priv: the bat priv with all the soft interface information | |
835 | * @tvlv_handler: tvlv callback function handling the tvlv content | |
836 | * @ogm_source: flag indicating wether the tvlv is an ogm or a unicast packet | |
837 | * @orig_node: orig node emitting the ogm packet | |
838 | * @src: source mac address of the unicast packet | |
839 | * @dst: destination mac address of the unicast packet | |
840 | * @tvlv_value: tvlv content | |
841 | * @tvlv_value_len: tvlv content length | |
842 | * | |
843 | * Returns success if handler was not found or the return value of the handler | |
844 | * callback. | |
845 | */ | |
846 | static int batadv_tvlv_call_handler(struct batadv_priv *bat_priv, | |
847 | struct batadv_tvlv_handler *tvlv_handler, | |
848 | bool ogm_source, | |
849 | struct batadv_orig_node *orig_node, | |
850 | uint8_t *src, uint8_t *dst, | |
851 | void *tvlv_value, uint16_t tvlv_value_len) | |
852 | { | |
853 | if (!tvlv_handler) | |
854 | return NET_RX_SUCCESS; | |
855 | ||
856 | if (ogm_source) { | |
857 | if (!tvlv_handler->ogm_handler) | |
858 | return NET_RX_SUCCESS; | |
859 | ||
860 | if (!orig_node) | |
861 | return NET_RX_SUCCESS; | |
862 | ||
863 | tvlv_handler->ogm_handler(bat_priv, orig_node, | |
864 | BATADV_NO_FLAGS, | |
865 | tvlv_value, tvlv_value_len); | |
866 | tvlv_handler->flags |= BATADV_TVLV_HANDLER_OGM_CALLED; | |
867 | } else { | |
868 | if (!src) | |
869 | return NET_RX_SUCCESS; | |
870 | ||
871 | if (!dst) | |
872 | return NET_RX_SUCCESS; | |
873 | ||
874 | if (!tvlv_handler->unicast_handler) | |
875 | return NET_RX_SUCCESS; | |
876 | ||
877 | return tvlv_handler->unicast_handler(bat_priv, src, | |
878 | dst, tvlv_value, | |
879 | tvlv_value_len); | |
880 | } | |
881 | ||
882 | return NET_RX_SUCCESS; | |
883 | } | |
884 | ||
885 | /** | |
886 | * batadv_tvlv_containers_process - parse the given tvlv buffer to call the | |
887 | * appropriate handlers | |
888 | * @bat_priv: the bat priv with all the soft interface information | |
889 | * @ogm_source: flag indicating wether the tvlv is an ogm or a unicast packet | |
890 | * @orig_node: orig node emitting the ogm packet | |
891 | * @src: source mac address of the unicast packet | |
892 | * @dst: destination mac address of the unicast packet | |
893 | * @tvlv_value: tvlv content | |
894 | * @tvlv_value_len: tvlv content length | |
895 | * | |
896 | * Returns success when processing an OGM or the return value of all called | |
897 | * handler callbacks. | |
898 | */ | |
899 | int batadv_tvlv_containers_process(struct batadv_priv *bat_priv, | |
900 | bool ogm_source, | |
901 | struct batadv_orig_node *orig_node, | |
902 | uint8_t *src, uint8_t *dst, | |
903 | void *tvlv_value, uint16_t tvlv_value_len) | |
904 | { | |
905 | struct batadv_tvlv_handler *tvlv_handler; | |
906 | struct batadv_tvlv_hdr *tvlv_hdr; | |
907 | uint16_t tvlv_value_cont_len; | |
908 | uint8_t cifnotfound = BATADV_TVLV_HANDLER_OGM_CIFNOTFND; | |
909 | int ret = NET_RX_SUCCESS; | |
910 | ||
911 | while (tvlv_value_len >= sizeof(*tvlv_hdr)) { | |
912 | tvlv_hdr = tvlv_value; | |
913 | tvlv_value_cont_len = ntohs(tvlv_hdr->len); | |
914 | tvlv_value = tvlv_hdr + 1; | |
915 | tvlv_value_len -= sizeof(*tvlv_hdr); | |
916 | ||
917 | if (tvlv_value_cont_len > tvlv_value_len) | |
918 | break; | |
919 | ||
920 | tvlv_handler = batadv_tvlv_handler_get(bat_priv, | |
921 | tvlv_hdr->type, | |
922 | tvlv_hdr->version); | |
923 | ||
924 | ret |= batadv_tvlv_call_handler(bat_priv, tvlv_handler, | |
925 | ogm_source, orig_node, | |
926 | src, dst, tvlv_value, | |
927 | tvlv_value_cont_len); | |
928 | if (tvlv_handler) | |
929 | batadv_tvlv_handler_free_ref(tvlv_handler); | |
930 | tvlv_value = (uint8_t *)tvlv_value + tvlv_value_cont_len; | |
931 | tvlv_value_len -= tvlv_value_cont_len; | |
932 | } | |
933 | ||
934 | if (!ogm_source) | |
935 | return ret; | |
936 | ||
937 | rcu_read_lock(); | |
938 | hlist_for_each_entry_rcu(tvlv_handler, | |
939 | &bat_priv->tvlv.handler_list, list) { | |
940 | if ((tvlv_handler->flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND) && | |
941 | !(tvlv_handler->flags & BATADV_TVLV_HANDLER_OGM_CALLED)) | |
942 | tvlv_handler->ogm_handler(bat_priv, orig_node, | |
943 | cifnotfound, NULL, 0); | |
944 | ||
945 | tvlv_handler->flags &= ~BATADV_TVLV_HANDLER_OGM_CALLED; | |
946 | } | |
947 | rcu_read_unlock(); | |
948 | ||
949 | return NET_RX_SUCCESS; | |
950 | } | |
951 | ||
952 | /** | |
953 | * batadv_tvlv_ogm_receive - process an incoming ogm and call the appropriate | |
954 | * handlers | |
955 | * @bat_priv: the bat priv with all the soft interface information | |
956 | * @batadv_ogm_packet: ogm packet containing the tvlv containers | |
957 | * @orig_node: orig node emitting the ogm packet | |
958 | */ | |
959 | void batadv_tvlv_ogm_receive(struct batadv_priv *bat_priv, | |
960 | struct batadv_ogm_packet *batadv_ogm_packet, | |
961 | struct batadv_orig_node *orig_node) | |
962 | { | |
963 | void *tvlv_value; | |
964 | uint16_t tvlv_value_len; | |
965 | ||
966 | if (!batadv_ogm_packet) | |
967 | return; | |
968 | ||
969 | tvlv_value_len = ntohs(batadv_ogm_packet->tvlv_len); | |
970 | if (!tvlv_value_len) | |
971 | return; | |
972 | ||
973 | tvlv_value = batadv_ogm_packet + 1; | |
974 | ||
975 | batadv_tvlv_containers_process(bat_priv, true, orig_node, NULL, NULL, | |
976 | tvlv_value, tvlv_value_len); | |
977 | } | |
978 | ||
979 | /** | |
980 | * batadv_tvlv_handler_register - register tvlv handler based on the provided | |
981 | * type and version (both need to match) for ogm tvlv payload and/or unicast | |
982 | * payload | |
983 | * @bat_priv: the bat priv with all the soft interface information | |
984 | * @optr: ogm tvlv handler callback function. This function receives the orig | |
985 | * node, flags and the tvlv content as argument to process. | |
986 | * @uptr: unicast tvlv handler callback function. This function receives the | |
987 | * source & destination of the unicast packet as well as the tvlv content | |
988 | * to process. | |
989 | * @type: tvlv handler type to be registered | |
990 | * @version: tvlv handler version to be registered | |
991 | * @flags: flags to enable or disable TVLV API behavior | |
992 | */ | |
993 | void batadv_tvlv_handler_register(struct batadv_priv *bat_priv, | |
994 | void (*optr)(struct batadv_priv *bat_priv, | |
995 | struct batadv_orig_node *orig, | |
996 | uint8_t flags, | |
997 | void *tvlv_value, | |
998 | uint16_t tvlv_value_len), | |
999 | int (*uptr)(struct batadv_priv *bat_priv, | |
1000 | uint8_t *src, uint8_t *dst, | |
1001 | void *tvlv_value, | |
1002 | uint16_t tvlv_value_len), | |
1003 | uint8_t type, uint8_t version, uint8_t flags) | |
1004 | { | |
1005 | struct batadv_tvlv_handler *tvlv_handler; | |
1006 | ||
1007 | tvlv_handler = batadv_tvlv_handler_get(bat_priv, type, version); | |
1008 | if (tvlv_handler) { | |
1009 | batadv_tvlv_handler_free_ref(tvlv_handler); | |
1010 | return; | |
1011 | } | |
1012 | ||
1013 | tvlv_handler = kzalloc(sizeof(*tvlv_handler), GFP_ATOMIC); | |
1014 | if (!tvlv_handler) | |
1015 | return; | |
1016 | ||
1017 | tvlv_handler->ogm_handler = optr; | |
1018 | tvlv_handler->unicast_handler = uptr; | |
1019 | tvlv_handler->type = type; | |
1020 | tvlv_handler->version = version; | |
1021 | tvlv_handler->flags = flags; | |
1022 | atomic_set(&tvlv_handler->refcount, 1); | |
1023 | INIT_HLIST_NODE(&tvlv_handler->list); | |
1024 | ||
1025 | spin_lock_bh(&bat_priv->tvlv.handler_list_lock); | |
1026 | hlist_add_head_rcu(&tvlv_handler->list, &bat_priv->tvlv.handler_list); | |
1027 | spin_unlock_bh(&bat_priv->tvlv.handler_list_lock); | |
1028 | } | |
1029 | ||
1030 | /** | |
1031 | * batadv_tvlv_handler_unregister - unregister tvlv handler based on the | |
1032 | * provided type and version (both need to match) | |
1033 | * @bat_priv: the bat priv with all the soft interface information | |
1034 | * @type: tvlv handler type to be unregistered | |
1035 | * @version: tvlv handler version to be unregistered | |
1036 | */ | |
1037 | void batadv_tvlv_handler_unregister(struct batadv_priv *bat_priv, | |
1038 | uint8_t type, uint8_t version) | |
1039 | { | |
1040 | struct batadv_tvlv_handler *tvlv_handler; | |
1041 | ||
1042 | tvlv_handler = batadv_tvlv_handler_get(bat_priv, type, version); | |
1043 | if (!tvlv_handler) | |
1044 | return; | |
1045 | ||
1046 | batadv_tvlv_handler_free_ref(tvlv_handler); | |
1047 | spin_lock_bh(&bat_priv->tvlv.handler_list_lock); | |
1048 | hlist_del_rcu(&tvlv_handler->list); | |
1049 | spin_unlock_bh(&bat_priv->tvlv.handler_list_lock); | |
1050 | batadv_tvlv_handler_free_ref(tvlv_handler); | |
1051 | } | |
1052 | ||
1053 | /** | |
1054 | * batadv_tvlv_unicast_send - send a unicast packet with tvlv payload to the | |
1055 | * specified host | |
1056 | * @bat_priv: the bat priv with all the soft interface information | |
1057 | * @src: source mac address of the unicast packet | |
1058 | * @dst: destination mac address of the unicast packet | |
1059 | * @type: tvlv type | |
1060 | * @version: tvlv version | |
1061 | * @tvlv_value: tvlv content | |
1062 | * @tvlv_value_len: tvlv content length | |
1063 | */ | |
1064 | void batadv_tvlv_unicast_send(struct batadv_priv *bat_priv, uint8_t *src, | |
1065 | uint8_t *dst, uint8_t type, uint8_t version, | |
1066 | void *tvlv_value, uint16_t tvlv_value_len) | |
1067 | { | |
1068 | struct batadv_unicast_tvlv_packet *unicast_tvlv_packet; | |
1069 | struct batadv_tvlv_hdr *tvlv_hdr; | |
1070 | struct batadv_orig_node *orig_node; | |
1071 | struct sk_buff *skb = NULL; | |
1072 | unsigned char *tvlv_buff; | |
1073 | unsigned int tvlv_len; | |
1074 | ssize_t hdr_len = sizeof(*unicast_tvlv_packet); | |
1075 | bool ret = false; | |
1076 | ||
1077 | orig_node = batadv_orig_hash_find(bat_priv, dst); | |
1078 | if (!orig_node) | |
1079 | goto out; | |
1080 | ||
1081 | tvlv_len = sizeof(*tvlv_hdr) + tvlv_value_len; | |
1082 | ||
1083 | skb = netdev_alloc_skb_ip_align(NULL, ETH_HLEN + hdr_len + tvlv_len); | |
1084 | if (!skb) | |
1085 | goto out; | |
1086 | ||
1087 | skb->priority = TC_PRIO_CONTROL; | |
1088 | skb_reserve(skb, ETH_HLEN); | |
1089 | tvlv_buff = skb_put(skb, sizeof(*unicast_tvlv_packet) + tvlv_len); | |
1090 | unicast_tvlv_packet = (struct batadv_unicast_tvlv_packet *)tvlv_buff; | |
1091 | unicast_tvlv_packet->header.packet_type = BATADV_UNICAST_TVLV; | |
1092 | unicast_tvlv_packet->header.version = BATADV_COMPAT_VERSION; | |
1093 | unicast_tvlv_packet->header.ttl = BATADV_TTL; | |
1094 | unicast_tvlv_packet->reserved = 0; | |
1095 | unicast_tvlv_packet->tvlv_len = htons(tvlv_len); | |
1096 | unicast_tvlv_packet->align = 0; | |
1097 | memcpy(unicast_tvlv_packet->src, src, ETH_ALEN); | |
1098 | memcpy(unicast_tvlv_packet->dst, dst, ETH_ALEN); | |
1099 | ||
1100 | tvlv_buff = (unsigned char *)(unicast_tvlv_packet + 1); | |
1101 | tvlv_hdr = (struct batadv_tvlv_hdr *)tvlv_buff; | |
1102 | tvlv_hdr->version = version; | |
1103 | tvlv_hdr->type = type; | |
1104 | tvlv_hdr->len = htons(tvlv_value_len); | |
1105 | tvlv_buff += sizeof(*tvlv_hdr); | |
1106 | memcpy(tvlv_buff, tvlv_value, tvlv_value_len); | |
1107 | ||
1108 | if (batadv_send_skb_to_orig(skb, orig_node, NULL) != NET_XMIT_DROP) | |
1109 | ret = true; | |
1110 | ||
1111 | out: | |
1112 | if (skb && !ret) | |
1113 | kfree_skb(skb); | |
1114 | if (orig_node) | |
1115 | batadv_orig_node_free_ref(orig_node); | |
1116 | } | |
1117 | ||
ee11ad61 | 1118 | static int batadv_param_set_ra(const char *val, const struct kernel_param *kp) |
d419be1f | 1119 | { |
56303d34 | 1120 | struct batadv_algo_ops *bat_algo_ops; |
d8cb5486 ML |
1121 | char *algo_name = (char *)val; |
1122 | size_t name_len = strlen(algo_name); | |
d419be1f | 1123 | |
293c9c1c | 1124 | if (name_len > 0 && algo_name[name_len - 1] == '\n') |
d8cb5486 ML |
1125 | algo_name[name_len - 1] = '\0'; |
1126 | ||
ee11ad61 | 1127 | bat_algo_ops = batadv_algo_get(algo_name); |
d419be1f | 1128 | if (!bat_algo_ops) { |
d8cb5486 | 1129 | pr_err("Routing algorithm '%s' is not supported\n", algo_name); |
d419be1f ML |
1130 | return -EINVAL; |
1131 | } | |
1132 | ||
d8cb5486 | 1133 | return param_set_copystring(algo_name, kp); |
d419be1f ML |
1134 | } |
1135 | ||
ee11ad61 SE |
1136 | static const struct kernel_param_ops batadv_param_ops_ra = { |
1137 | .set = batadv_param_set_ra, | |
d419be1f ML |
1138 | .get = param_get_string, |
1139 | }; | |
1140 | ||
ee11ad61 | 1141 | static struct kparam_string batadv_param_string_ra = { |
3193e8fd SE |
1142 | .maxlen = sizeof(batadv_routing_algo), |
1143 | .string = batadv_routing_algo, | |
d419be1f ML |
1144 | }; |
1145 | ||
ee11ad61 SE |
1146 | module_param_cb(routing_algo, &batadv_param_ops_ra, &batadv_param_string_ra, |
1147 | 0644); | |
1148 | module_init(batadv_init); | |
1149 | module_exit(batadv_exit); | |
c6c8fea2 SE |
1150 | |
1151 | MODULE_LICENSE("GPL"); | |
1152 | ||
42d0b044 SE |
1153 | MODULE_AUTHOR(BATADV_DRIVER_AUTHOR); |
1154 | MODULE_DESCRIPTION(BATADV_DRIVER_DESC); | |
1155 | MODULE_SUPPORTED_DEVICE(BATADV_DRIVER_DEVICE); | |
1156 | MODULE_VERSION(BATADV_SOURCE_VERSION); |