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0046b040 | 1 | /* Copyright (C) 2007-2016 B.A.T.M.A.N. contributors: |
c6c8fea2 SE |
2 | * |
3 | * Marek Lindner, Simon Wunderlich | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or | |
6 | * modify it under the terms of version 2 of the GNU General Public | |
7 | * License as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but | |
10 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | * General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
ebf38fb7 | 15 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
c6c8fea2 SE |
16 | */ |
17 | ||
1e2c2a4f SE |
18 | #include "main.h" |
19 | ||
20 | #include <linux/atomic.h> | |
21 | #include <linux/bug.h> | |
22 | #include <linux/byteorder/generic.h> | |
95a066d8 | 23 | #include <linux/crc32c.h> |
1e2c2a4f SE |
24 | #include <linux/errno.h> |
25 | #include <linux/fs.h> | |
26 | #include <linux/if_ether.h> | |
c54f38c9 | 27 | #include <linux/if_vlan.h> |
1e2c2a4f SE |
28 | #include <linux/init.h> |
29 | #include <linux/ip.h> | |
30 | #include <linux/ipv6.h> | |
31 | #include <linux/kernel.h> | |
f7157dd1 | 32 | #include <linux/kref.h> |
1e2c2a4f | 33 | #include <linux/list.h> |
2c72d655 | 34 | #include <linux/lockdep.h> |
1e2c2a4f SE |
35 | #include <linux/module.h> |
36 | #include <linux/moduleparam.h> | |
37 | #include <linux/netdevice.h> | |
38 | #include <linux/pkt_sched.h> | |
39 | #include <linux/rculist.h> | |
40 | #include <linux/rcupdate.h> | |
41 | #include <linux/seq_file.h> | |
42 | #include <linux/skbuff.h> | |
43 | #include <linux/slab.h> | |
44 | #include <linux/spinlock.h> | |
45 | #include <linux/stddef.h> | |
46 | #include <linux/string.h> | |
47 | #include <linux/workqueue.h> | |
c54f38c9 | 48 | #include <net/dsfield.h> |
1e2c2a4f SE |
49 | #include <net/rtnetlink.h> |
50 | ||
51 | #include "bat_algo.h" | |
52 | #include "bridge_loop_avoidance.h" | |
b706b13b | 53 | #include "debugfs.h" |
1e2c2a4f SE |
54 | #include "distributed-arp-table.h" |
55 | #include "gateway_client.h" | |
56 | #include "gateway_common.h" | |
57 | #include "hard-interface.h" | |
58 | #include "icmp_socket.h" | |
59 | #include "multicast.h" | |
60 | #include "network-coding.h" | |
61 | #include "originator.h" | |
62 | #include "packet.h" | |
c6c8fea2 SE |
63 | #include "routing.h" |
64 | #include "send.h" | |
c6c8fea2 | 65 | #include "soft-interface.h" |
c6c8fea2 | 66 | #include "translation-table.h" |
c6c8fea2 | 67 | |
c3caf519 | 68 | /* List manipulations on hardif_list have to be rtnl_lock()'ed, |
9cfc7bd6 SE |
69 | * list traversals just rcu-locked |
70 | */ | |
3193e8fd | 71 | struct list_head batadv_hardif_list; |
ee11ad61 | 72 | static int (*batadv_rx_handler[256])(struct sk_buff *, |
56303d34 | 73 | struct batadv_hard_iface *); |
3193e8fd | 74 | char batadv_routing_algo[20] = "BATMAN_IV"; |
ee11ad61 | 75 | static struct hlist_head batadv_algo_list; |
c6c8fea2 | 76 | |
3193e8fd | 77 | unsigned char batadv_broadcast_addr[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; |
c6c8fea2 | 78 | |
3193e8fd | 79 | struct workqueue_struct *batadv_event_workqueue; |
c6c8fea2 | 80 | |
ee11ad61 | 81 | static void batadv_recv_handler_init(void); |
ffa995e0 | 82 | |
ee11ad61 | 83 | static int __init batadv_init(void) |
c6c8fea2 | 84 | { |
3193e8fd | 85 | INIT_LIST_HEAD(&batadv_hardif_list); |
ee11ad61 | 86 | INIT_HLIST_HEAD(&batadv_algo_list); |
1c280471 | 87 | |
ee11ad61 | 88 | batadv_recv_handler_init(); |
ffa995e0 | 89 | |
d6f94d91 | 90 | batadv_v_init(); |
81c524f7 | 91 | batadv_iv_init(); |
6c519bad | 92 | batadv_nc_init(); |
c6c8fea2 | 93 | |
3193e8fd | 94 | batadv_event_workqueue = create_singlethread_workqueue("bat_events"); |
c6c8fea2 | 95 | |
3193e8fd | 96 | if (!batadv_event_workqueue) |
c6c8fea2 SE |
97 | return -ENOMEM; |
98 | ||
9039dc7e | 99 | batadv_socket_init(); |
40a072d7 | 100 | batadv_debugfs_init(); |
c6c8fea2 | 101 | |
9563877e | 102 | register_netdevice_notifier(&batadv_hard_if_notifier); |
a4ac28c0 | 103 | rtnl_link_register(&batadv_link_ops); |
c6c8fea2 | 104 | |
86ceb360 | 105 | pr_info("B.A.T.M.A.N. advanced %s (compatibility version %i) loaded\n", |
42d0b044 | 106 | BATADV_SOURCE_VERSION, BATADV_COMPAT_VERSION); |
c6c8fea2 SE |
107 | |
108 | return 0; | |
109 | } | |
110 | ||
ee11ad61 | 111 | static void __exit batadv_exit(void) |
c6c8fea2 | 112 | { |
40a072d7 | 113 | batadv_debugfs_destroy(); |
a4ac28c0 | 114 | rtnl_link_unregister(&batadv_link_ops); |
9563877e SE |
115 | unregister_netdevice_notifier(&batadv_hard_if_notifier); |
116 | batadv_hardif_remove_interfaces(); | |
c6c8fea2 | 117 | |
3193e8fd SE |
118 | flush_workqueue(batadv_event_workqueue); |
119 | destroy_workqueue(batadv_event_workqueue); | |
120 | batadv_event_workqueue = NULL; | |
c6c8fea2 SE |
121 | |
122 | rcu_barrier(); | |
123 | } | |
124 | ||
3193e8fd | 125 | int batadv_mesh_init(struct net_device *soft_iface) |
c6c8fea2 | 126 | { |
56303d34 | 127 | struct batadv_priv *bat_priv = netdev_priv(soft_iface); |
5346c35e | 128 | int ret; |
c6c8fea2 | 129 | |
c6c8fea2 SE |
130 | spin_lock_init(&bat_priv->forw_bat_list_lock); |
131 | spin_lock_init(&bat_priv->forw_bcast_list_lock); | |
807736f6 SE |
132 | spin_lock_init(&bat_priv->tt.changes_list_lock); |
133 | spin_lock_init(&bat_priv->tt.req_list_lock); | |
134 | spin_lock_init(&bat_priv->tt.roam_list_lock); | |
135 | spin_lock_init(&bat_priv->tt.last_changeset_lock); | |
a70a9aa9 | 136 | spin_lock_init(&bat_priv->tt.commit_lock); |
807736f6 | 137 | spin_lock_init(&bat_priv->gw.list_lock); |
ab49886e LL |
138 | #ifdef CONFIG_BATMAN_ADV_MCAST |
139 | spin_lock_init(&bat_priv->mcast.want_lists_lock); | |
140 | #endif | |
ef261577 ML |
141 | spin_lock_init(&bat_priv->tvlv.container_list_lock); |
142 | spin_lock_init(&bat_priv->tvlv.handler_list_lock); | |
5d2c05b2 | 143 | spin_lock_init(&bat_priv->softif_vlan_list_lock); |
c6c8fea2 SE |
144 | |
145 | INIT_HLIST_HEAD(&bat_priv->forw_bat_list); | |
146 | INIT_HLIST_HEAD(&bat_priv->forw_bcast_list); | |
807736f6 | 147 | INIT_HLIST_HEAD(&bat_priv->gw.list); |
ab49886e LL |
148 | #ifdef CONFIG_BATMAN_ADV_MCAST |
149 | INIT_HLIST_HEAD(&bat_priv->mcast.want_all_unsnoopables_list); | |
4c8755d6 LL |
150 | INIT_HLIST_HEAD(&bat_priv->mcast.want_all_ipv4_list); |
151 | INIT_HLIST_HEAD(&bat_priv->mcast.want_all_ipv6_list); | |
ab49886e | 152 | #endif |
807736f6 | 153 | INIT_LIST_HEAD(&bat_priv->tt.changes_list); |
7c26a53b | 154 | INIT_HLIST_HEAD(&bat_priv->tt.req_list); |
807736f6 | 155 | INIT_LIST_HEAD(&bat_priv->tt.roam_list); |
c5caf4ef LL |
156 | #ifdef CONFIG_BATMAN_ADV_MCAST |
157 | INIT_HLIST_HEAD(&bat_priv->mcast.mla_list); | |
158 | #endif | |
ef261577 ML |
159 | INIT_HLIST_HEAD(&bat_priv->tvlv.container_list); |
160 | INIT_HLIST_HEAD(&bat_priv->tvlv.handler_list); | |
5d2c05b2 | 161 | INIT_HLIST_HEAD(&bat_priv->softif_vlan_list); |
c6c8fea2 | 162 | |
0da00359 AQ |
163 | ret = batadv_v_mesh_init(bat_priv); |
164 | if (ret < 0) | |
165 | goto err; | |
166 | ||
7d211efc | 167 | ret = batadv_originator_init(bat_priv); |
5346c35e | 168 | if (ret < 0) |
c6c8fea2 SE |
169 | goto err; |
170 | ||
08c36d3e | 171 | ret = batadv_tt_init(bat_priv); |
5346c35e | 172 | if (ret < 0) |
c6c8fea2 SE |
173 | goto err; |
174 | ||
08adf151 | 175 | ret = batadv_bla_init(bat_priv); |
5346c35e | 176 | if (ret < 0) |
23721387 SW |
177 | goto err; |
178 | ||
2f1dfbe1 AQ |
179 | ret = batadv_dat_init(bat_priv); |
180 | if (ret < 0) | |
181 | goto err; | |
182 | ||
6c519bad | 183 | ret = batadv_nc_mesh_init(bat_priv); |
d353d8d4 MH |
184 | if (ret < 0) |
185 | goto err; | |
186 | ||
414254e3 | 187 | batadv_gw_init(bat_priv); |
60432d75 | 188 | batadv_mcast_init(bat_priv); |
414254e3 | 189 | |
807736f6 | 190 | atomic_set(&bat_priv->gw.reselect, 0); |
39c75a51 | 191 | atomic_set(&bat_priv->mesh_state, BATADV_MESH_ACTIVE); |
5346c35e SE |
192 | |
193 | return 0; | |
c6c8fea2 SE |
194 | |
195 | err: | |
3193e8fd | 196 | batadv_mesh_free(soft_iface); |
5346c35e | 197 | return ret; |
c6c8fea2 SE |
198 | } |
199 | ||
3193e8fd | 200 | void batadv_mesh_free(struct net_device *soft_iface) |
c6c8fea2 | 201 | { |
56303d34 | 202 | struct batadv_priv *bat_priv = netdev_priv(soft_iface); |
c6c8fea2 | 203 | |
39c75a51 | 204 | atomic_set(&bat_priv->mesh_state, BATADV_MESH_DEACTIVATING); |
c6c8fea2 | 205 | |
9455e34c | 206 | batadv_purge_outstanding_packets(bat_priv, NULL); |
c6c8fea2 | 207 | |
bd3524c1 | 208 | batadv_gw_node_free(bat_priv); |
0da00359 AQ |
209 | |
210 | batadv_v_mesh_free(bat_priv); | |
6c519bad | 211 | batadv_nc_mesh_free(bat_priv); |
a4361860 AQ |
212 | batadv_dat_free(bat_priv); |
213 | batadv_bla_free(bat_priv); | |
c6c8fea2 | 214 | |
c5caf4ef LL |
215 | batadv_mcast_free(bat_priv); |
216 | ||
a4361860 AQ |
217 | /* Free the TT and the originator tables only after having terminated |
218 | * all the other depending components which may use these structures for | |
219 | * their purposes. | |
220 | */ | |
08c36d3e | 221 | batadv_tt_free(bat_priv); |
c6c8fea2 | 222 | |
a4361860 AQ |
223 | /* Since the originator table clean up routine is accessing the TT |
224 | * tables as well, it has to be invoked after the TT tables have been | |
225 | * freed and marked as empty. This ensures that no cleanup RCU callbacks | |
226 | * accessing the TT data are scheduled for later execution. | |
227 | */ | |
228 | batadv_originator_free(bat_priv); | |
2f1dfbe1 | 229 | |
414254e3 ML |
230 | batadv_gw_free(bat_priv); |
231 | ||
f8214865 | 232 | free_percpu(bat_priv->bat_counters); |
f69ae770 | 233 | bat_priv->bat_counters = NULL; |
f8214865 | 234 | |
39c75a51 | 235 | atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE); |
c6c8fea2 SE |
236 | } |
237 | ||
6e0895c2 DM |
238 | /** |
239 | * batadv_is_my_mac - check if the given mac address belongs to any of the real | |
240 | * interfaces in the current mesh | |
241 | * @bat_priv: the bat priv with all the soft interface information | |
242 | * @addr: the address to check | |
e8ad3b1a | 243 | * |
62fe710f | 244 | * Return: 'true' if the mac address was found, false otherwise. |
6e0895c2 | 245 | */ |
6b5e971a | 246 | bool batadv_is_my_mac(struct batadv_priv *bat_priv, const u8 *addr) |
c6c8fea2 | 247 | { |
56303d34 | 248 | const struct batadv_hard_iface *hard_iface; |
e8ad3b1a | 249 | bool is_my_mac = false; |
c6c8fea2 SE |
250 | |
251 | rcu_read_lock(); | |
3193e8fd | 252 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e9a4f295 | 253 | if (hard_iface->if_status != BATADV_IF_ACTIVE) |
c6c8fea2 SE |
254 | continue; |
255 | ||
fe8a93b9 AQ |
256 | if (hard_iface->soft_iface != bat_priv->soft_iface) |
257 | continue; | |
258 | ||
1eda58bf | 259 | if (batadv_compare_eth(hard_iface->net_dev->dev_addr, addr)) { |
e8ad3b1a MP |
260 | is_my_mac = true; |
261 | break; | |
c6c8fea2 SE |
262 | } |
263 | } | |
264 | rcu_read_unlock(); | |
e8ad3b1a | 265 | return is_my_mac; |
c6c8fea2 SE |
266 | } |
267 | ||
30da63a6 ML |
268 | /** |
269 | * batadv_seq_print_text_primary_if_get - called from debugfs table printing | |
270 | * function that requires the primary interface | |
271 | * @seq: debugfs table seq_file struct | |
272 | * | |
62fe710f | 273 | * Return: primary interface if found or NULL otherwise. |
30da63a6 ML |
274 | */ |
275 | struct batadv_hard_iface * | |
276 | batadv_seq_print_text_primary_if_get(struct seq_file *seq) | |
277 | { | |
278 | struct net_device *net_dev = (struct net_device *)seq->private; | |
279 | struct batadv_priv *bat_priv = netdev_priv(net_dev); | |
280 | struct batadv_hard_iface *primary_if; | |
281 | ||
282 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
283 | ||
284 | if (!primary_if) { | |
285 | seq_printf(seq, | |
286 | "BATMAN mesh %s disabled - please specify interfaces to enable it\n", | |
287 | net_dev->name); | |
288 | goto out; | |
289 | } | |
290 | ||
291 | if (primary_if->if_status == BATADV_IF_ACTIVE) | |
292 | goto out; | |
293 | ||
294 | seq_printf(seq, | |
295 | "BATMAN mesh %s disabled - primary interface not active\n", | |
296 | net_dev->name); | |
82047ad7 | 297 | batadv_hardif_put(primary_if); |
30da63a6 ML |
298 | primary_if = NULL; |
299 | ||
300 | out: | |
301 | return primary_if; | |
302 | } | |
303 | ||
411d6ed9 ML |
304 | /** |
305 | * batadv_max_header_len - calculate maximum encapsulation overhead for a | |
306 | * payload packet | |
307 | * | |
62fe710f | 308 | * Return: the maximum encapsulation overhead in bytes. |
411d6ed9 ML |
309 | */ |
310 | int batadv_max_header_len(void) | |
311 | { | |
312 | int header_len = 0; | |
313 | ||
314 | header_len = max_t(int, header_len, | |
315 | sizeof(struct batadv_unicast_packet)); | |
316 | header_len = max_t(int, header_len, | |
317 | sizeof(struct batadv_unicast_4addr_packet)); | |
318 | header_len = max_t(int, header_len, | |
319 | sizeof(struct batadv_bcast_packet)); | |
320 | ||
321 | #ifdef CONFIG_BATMAN_ADV_NC | |
322 | header_len = max_t(int, header_len, | |
323 | sizeof(struct batadv_coded_packet)); | |
324 | #endif | |
325 | ||
1df0cbd5 | 326 | return header_len + ETH_HLEN; |
411d6ed9 ML |
327 | } |
328 | ||
c54f38c9 SW |
329 | /** |
330 | * batadv_skb_set_priority - sets skb priority according to packet content | |
331 | * @skb: the packet to be sent | |
332 | * @offset: offset to the packet content | |
333 | * | |
334 | * This function sets a value between 256 and 263 (802.1d priority), which | |
335 | * can be interpreted by the cfg80211 or other drivers. | |
336 | */ | |
337 | void batadv_skb_set_priority(struct sk_buff *skb, int offset) | |
338 | { | |
339 | struct iphdr ip_hdr_tmp, *ip_hdr; | |
340 | struct ipv6hdr ip6_hdr_tmp, *ip6_hdr; | |
341 | struct ethhdr ethhdr_tmp, *ethhdr; | |
342 | struct vlan_ethhdr *vhdr, vhdr_tmp; | |
343 | u32 prio; | |
344 | ||
345 | /* already set, do nothing */ | |
346 | if (skb->priority >= 256 && skb->priority <= 263) | |
347 | return; | |
348 | ||
349 | ethhdr = skb_header_pointer(skb, offset, sizeof(*ethhdr), ðhdr_tmp); | |
350 | if (!ethhdr) | |
351 | return; | |
352 | ||
353 | switch (ethhdr->h_proto) { | |
354 | case htons(ETH_P_8021Q): | |
355 | vhdr = skb_header_pointer(skb, offset + sizeof(*vhdr), | |
356 | sizeof(*vhdr), &vhdr_tmp); | |
357 | if (!vhdr) | |
358 | return; | |
359 | prio = ntohs(vhdr->h_vlan_TCI) & VLAN_PRIO_MASK; | |
360 | prio = prio >> VLAN_PRIO_SHIFT; | |
361 | break; | |
362 | case htons(ETH_P_IP): | |
363 | ip_hdr = skb_header_pointer(skb, offset + sizeof(*ethhdr), | |
364 | sizeof(*ip_hdr), &ip_hdr_tmp); | |
365 | if (!ip_hdr) | |
366 | return; | |
367 | prio = (ipv4_get_dsfield(ip_hdr) & 0xfc) >> 5; | |
368 | break; | |
369 | case htons(ETH_P_IPV6): | |
370 | ip6_hdr = skb_header_pointer(skb, offset + sizeof(*ethhdr), | |
371 | sizeof(*ip6_hdr), &ip6_hdr_tmp); | |
372 | if (!ip6_hdr) | |
373 | return; | |
374 | prio = (ipv6_get_dsfield(ip6_hdr) & 0xfc) >> 5; | |
375 | break; | |
376 | default: | |
377 | return; | |
378 | } | |
379 | ||
380 | skb->priority = prio + 256; | |
381 | } | |
382 | ||
ee11ad61 | 383 | static int batadv_recv_unhandled_packet(struct sk_buff *skb, |
56303d34 | 384 | struct batadv_hard_iface *recv_if) |
ffa995e0 ML |
385 | { |
386 | return NET_RX_DROP; | |
387 | } | |
388 | ||
389 | /* incoming packets with the batman ethertype received on any active hard | |
390 | * interface | |
391 | */ | |
3193e8fd SE |
392 | int batadv_batman_skb_recv(struct sk_buff *skb, struct net_device *dev, |
393 | struct packet_type *ptype, | |
394 | struct net_device *orig_dev) | |
ffa995e0 | 395 | { |
56303d34 | 396 | struct batadv_priv *bat_priv; |
96412690 | 397 | struct batadv_ogm_packet *batadv_ogm_packet; |
56303d34 | 398 | struct batadv_hard_iface *hard_iface; |
6b5e971a | 399 | u8 idx; |
ffa995e0 ML |
400 | int ret; |
401 | ||
56303d34 SE |
402 | hard_iface = container_of(ptype, struct batadv_hard_iface, |
403 | batman_adv_ptype); | |
ffa995e0 ML |
404 | skb = skb_share_check(skb, GFP_ATOMIC); |
405 | ||
406 | /* skb was released by skb_share_check() */ | |
407 | if (!skb) | |
408 | goto err_out; | |
409 | ||
410 | /* packet should hold at least type and version */ | |
411 | if (unlikely(!pskb_may_pull(skb, 2))) | |
412 | goto err_free; | |
413 | ||
414 | /* expect a valid ethernet header here. */ | |
415 | if (unlikely(skb->mac_len != ETH_HLEN || !skb_mac_header(skb))) | |
416 | goto err_free; | |
417 | ||
418 | if (!hard_iface->soft_iface) | |
419 | goto err_free; | |
420 | ||
421 | bat_priv = netdev_priv(hard_iface->soft_iface); | |
422 | ||
39c75a51 | 423 | if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) |
ffa995e0 ML |
424 | goto err_free; |
425 | ||
426 | /* discard frames on not active interfaces */ | |
e9a4f295 | 427 | if (hard_iface->if_status != BATADV_IF_ACTIVE) |
ffa995e0 ML |
428 | goto err_free; |
429 | ||
96412690 | 430 | batadv_ogm_packet = (struct batadv_ogm_packet *)skb->data; |
ffa995e0 | 431 | |
a40d9b07 | 432 | if (batadv_ogm_packet->version != BATADV_COMPAT_VERSION) { |
39c75a51 | 433 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 434 | "Drop packet: incompatible batman version (%i)\n", |
a40d9b07 | 435 | batadv_ogm_packet->version); |
ffa995e0 ML |
436 | goto err_free; |
437 | } | |
438 | ||
e0d9677e MH |
439 | /* reset control block to avoid left overs from previous users */ |
440 | memset(skb->cb, 0, sizeof(struct batadv_skb_cb)); | |
441 | ||
ffa995e0 ML |
442 | /* all receive handlers return whether they received or reused |
443 | * the supplied skb. if not, we have to free the skb. | |
444 | */ | |
a40d9b07 | 445 | idx = batadv_ogm_packet->packet_type; |
ee11ad61 | 446 | ret = (*batadv_rx_handler[idx])(skb, hard_iface); |
ffa995e0 ML |
447 | |
448 | if (ret == NET_RX_DROP) | |
449 | kfree_skb(skb); | |
450 | ||
451 | /* return NET_RX_SUCCESS in any case as we | |
452 | * most probably dropped the packet for | |
453 | * routing-logical reasons. | |
454 | */ | |
455 | return NET_RX_SUCCESS; | |
456 | ||
457 | err_free: | |
458 | kfree_skb(skb); | |
459 | err_out: | |
460 | return NET_RX_DROP; | |
461 | } | |
462 | ||
ee11ad61 | 463 | static void batadv_recv_handler_init(void) |
ffa995e0 ML |
464 | { |
465 | int i; | |
466 | ||
ee11ad61 SE |
467 | for (i = 0; i < ARRAY_SIZE(batadv_rx_handler); i++) |
468 | batadv_rx_handler[i] = batadv_recv_unhandled_packet; | |
ffa995e0 | 469 | |
a1f1ac5c SW |
470 | for (i = BATADV_UNICAST_MIN; i <= BATADV_UNICAST_MAX; i++) |
471 | batadv_rx_handler[i] = batadv_recv_unhandled_unicast_packet; | |
472 | ||
031ace8d SW |
473 | /* compile time checks for sizes */ |
474 | BUILD_BUG_ON(sizeof(struct batadv_bla_claim_dst) != 6); | |
475 | BUILD_BUG_ON(sizeof(struct batadv_ogm_packet) != 24); | |
476 | BUILD_BUG_ON(sizeof(struct batadv_icmp_header) != 20); | |
477 | BUILD_BUG_ON(sizeof(struct batadv_icmp_packet) != 20); | |
478 | BUILD_BUG_ON(sizeof(struct batadv_icmp_packet_rr) != 116); | |
479 | BUILD_BUG_ON(sizeof(struct batadv_unicast_packet) != 10); | |
480 | BUILD_BUG_ON(sizeof(struct batadv_unicast_4addr_packet) != 18); | |
481 | BUILD_BUG_ON(sizeof(struct batadv_frag_packet) != 20); | |
482 | BUILD_BUG_ON(sizeof(struct batadv_bcast_packet) != 14); | |
483 | BUILD_BUG_ON(sizeof(struct batadv_coded_packet) != 46); | |
484 | BUILD_BUG_ON(sizeof(struct batadv_unicast_tvlv_packet) != 20); | |
485 | BUILD_BUG_ON(sizeof(struct batadv_tvlv_hdr) != 4); | |
486 | BUILD_BUG_ON(sizeof(struct batadv_tvlv_gateway_data) != 8); | |
487 | BUILD_BUG_ON(sizeof(struct batadv_tvlv_tt_vlan_data) != 8); | |
488 | BUILD_BUG_ON(sizeof(struct batadv_tvlv_tt_change) != 12); | |
489 | BUILD_BUG_ON(sizeof(struct batadv_tvlv_roam_adv) != 8); | |
80067c83 | 490 | |
a1f1ac5c SW |
491 | /* broadcast packet */ |
492 | batadv_rx_handler[BATADV_BCAST] = batadv_recv_bcast_packet; | |
493 | ||
494 | /* unicast packets ... */ | |
7cdcf6dd AQ |
495 | /* unicast with 4 addresses packet */ |
496 | batadv_rx_handler[BATADV_UNICAST_4ADDR] = batadv_recv_unicast_packet; | |
ffa995e0 | 497 | /* unicast packet */ |
acd34afa | 498 | batadv_rx_handler[BATADV_UNICAST] = batadv_recv_unicast_packet; |
ef261577 ML |
499 | /* unicast tvlv packet */ |
500 | batadv_rx_handler[BATADV_UNICAST_TVLV] = batadv_recv_unicast_tvlv; | |
a1f1ac5c SW |
501 | /* batman icmp packet */ |
502 | batadv_rx_handler[BATADV_ICMP] = batadv_recv_icmp_packet; | |
610bfc6b MH |
503 | /* Fragmented packets */ |
504 | batadv_rx_handler[BATADV_UNICAST_FRAG] = batadv_recv_frag_packet; | |
ffa995e0 ML |
505 | } |
506 | ||
56303d34 | 507 | int |
6b5e971a | 508 | batadv_recv_handler_register(u8 packet_type, |
56303d34 SE |
509 | int (*recv_handler)(struct sk_buff *, |
510 | struct batadv_hard_iface *)) | |
ffa995e0 | 511 | { |
a1f1ac5c SW |
512 | int (*curr)(struct sk_buff *, |
513 | struct batadv_hard_iface *); | |
514 | curr = batadv_rx_handler[packet_type]; | |
515 | ||
516 | if ((curr != batadv_recv_unhandled_packet) && | |
517 | (curr != batadv_recv_unhandled_unicast_packet)) | |
ffa995e0 ML |
518 | return -EBUSY; |
519 | ||
ee11ad61 | 520 | batadv_rx_handler[packet_type] = recv_handler; |
ffa995e0 ML |
521 | return 0; |
522 | } | |
523 | ||
6b5e971a | 524 | void batadv_recv_handler_unregister(u8 packet_type) |
ffa995e0 | 525 | { |
ee11ad61 | 526 | batadv_rx_handler[packet_type] = batadv_recv_unhandled_packet; |
ffa995e0 ML |
527 | } |
528 | ||
56303d34 | 529 | static struct batadv_algo_ops *batadv_algo_get(char *name) |
1c280471 | 530 | { |
56303d34 | 531 | struct batadv_algo_ops *bat_algo_ops = NULL, *bat_algo_ops_tmp; |
1c280471 | 532 | |
b67bfe0d | 533 | hlist_for_each_entry(bat_algo_ops_tmp, &batadv_algo_list, list) { |
1c280471 ML |
534 | if (strcmp(bat_algo_ops_tmp->name, name) != 0) |
535 | continue; | |
536 | ||
537 | bat_algo_ops = bat_algo_ops_tmp; | |
538 | break; | |
539 | } | |
540 | ||
541 | return bat_algo_ops; | |
542 | } | |
543 | ||
56303d34 | 544 | int batadv_algo_register(struct batadv_algo_ops *bat_algo_ops) |
1c280471 | 545 | { |
56303d34 | 546 | struct batadv_algo_ops *bat_algo_ops_tmp; |
1c280471 | 547 | |
ee11ad61 | 548 | bat_algo_ops_tmp = batadv_algo_get(bat_algo_ops->name); |
1c280471 | 549 | if (bat_algo_ops_tmp) { |
86ceb360 SE |
550 | pr_info("Trying to register already registered routing algorithm: %s\n", |
551 | bat_algo_ops->name); | |
9fb6c651 | 552 | return -EEXIST; |
1c280471 ML |
553 | } |
554 | ||
01c4224b | 555 | /* all algorithms must implement all ops (for now) */ |
c2aca022 | 556 | if (!bat_algo_ops->bat_iface_enable || |
00a50076 | 557 | !bat_algo_ops->bat_iface_disable || |
c3229398 | 558 | !bat_algo_ops->bat_iface_update_mac || |
cd8b78e7 | 559 | !bat_algo_ops->bat_primary_iface_set || |
01c4224b | 560 | !bat_algo_ops->bat_ogm_schedule || |
a3285a8f | 561 | !bat_algo_ops->bat_ogm_emit || |
c43c981e | 562 | !bat_algo_ops->bat_neigh_cmp || |
18165f6f | 563 | !bat_algo_ops->bat_neigh_is_similar_or_better) { |
01c4224b ML |
564 | pr_info("Routing algo '%s' does not implement required ops\n", |
565 | bat_algo_ops->name); | |
9fb6c651 | 566 | return -EINVAL; |
01c4224b ML |
567 | } |
568 | ||
1c280471 | 569 | INIT_HLIST_NODE(&bat_algo_ops->list); |
ee11ad61 | 570 | hlist_add_head(&bat_algo_ops->list, &batadv_algo_list); |
1c280471 | 571 | |
9fb6c651 | 572 | return 0; |
1c280471 ML |
573 | } |
574 | ||
56303d34 | 575 | int batadv_algo_select(struct batadv_priv *bat_priv, char *name) |
1c280471 | 576 | { |
56303d34 | 577 | struct batadv_algo_ops *bat_algo_ops; |
1c280471 | 578 | |
ee11ad61 | 579 | bat_algo_ops = batadv_algo_get(name); |
1c280471 | 580 | if (!bat_algo_ops) |
f372d090 | 581 | return -EINVAL; |
1c280471 ML |
582 | |
583 | bat_priv->bat_algo_ops = bat_algo_ops; | |
1c280471 | 584 | |
f372d090 | 585 | return 0; |
1c280471 ML |
586 | } |
587 | ||
3193e8fd | 588 | int batadv_algo_seq_print_text(struct seq_file *seq, void *offset) |
1c280471 | 589 | { |
56303d34 | 590 | struct batadv_algo_ops *bat_algo_ops; |
1c280471 | 591 | |
0c814653 | 592 | seq_puts(seq, "Available routing algorithms:\n"); |
1c280471 | 593 | |
b67bfe0d | 594 | hlist_for_each_entry(bat_algo_ops, &batadv_algo_list, list) { |
854d2a63 | 595 | seq_printf(seq, " * %s\n", bat_algo_ops->name); |
1c280471 ML |
596 | } |
597 | ||
598 | return 0; | |
599 | } | |
600 | ||
95a066d8 SE |
601 | /** |
602 | * batadv_skb_crc32 - calculate CRC32 of the whole packet and skip bytes in | |
603 | * the header | |
604 | * @skb: skb pointing to fragmented socket buffers | |
605 | * @payload_ptr: Pointer to position inside the head buffer of the skb | |
606 | * marking the start of the data to be CRC'ed | |
607 | * | |
608 | * payload_ptr must always point to an address in the skb head buffer and not to | |
609 | * a fragment. | |
7afcbbef SE |
610 | * |
611 | * Return: big endian crc32c of the checksummed data | |
95a066d8 SE |
612 | */ |
613 | __be32 batadv_skb_crc32(struct sk_buff *skb, u8 *payload_ptr) | |
614 | { | |
615 | u32 crc = 0; | |
616 | unsigned int from; | |
617 | unsigned int to = skb->len; | |
618 | struct skb_seq_state st; | |
619 | const u8 *data; | |
620 | unsigned int len; | |
621 | unsigned int consumed = 0; | |
622 | ||
623 | from = (unsigned int)(payload_ptr - skb->data); | |
624 | ||
625 | skb_prepare_seq_read(skb, from, to, &st); | |
626 | while ((len = skb_seq_read(consumed, &data, &st)) != 0) { | |
627 | crc = crc32c(crc, data, len); | |
628 | consumed += len; | |
629 | } | |
95a066d8 SE |
630 | |
631 | return htonl(crc); | |
632 | } | |
633 | ||
ef261577 | 634 | /** |
32836f56 SE |
635 | * batadv_tvlv_handler_release - release tvlv handler from lists and queue for |
636 | * free after rcu grace period | |
637 | * @ref: kref pointer of the tvlv | |
638 | */ | |
639 | static void batadv_tvlv_handler_release(struct kref *ref) | |
640 | { | |
641 | struct batadv_tvlv_handler *tvlv_handler; | |
642 | ||
643 | tvlv_handler = container_of(ref, struct batadv_tvlv_handler, refcount); | |
644 | kfree_rcu(tvlv_handler, rcu); | |
645 | } | |
646 | ||
647 | /** | |
ba610043 | 648 | * batadv_tvlv_handler_put - decrement the tvlv container refcounter and |
32836f56 | 649 | * possibly release it |
ef261577 ML |
650 | * @tvlv_handler: the tvlv handler to free |
651 | */ | |
ba610043 | 652 | static void batadv_tvlv_handler_put(struct batadv_tvlv_handler *tvlv_handler) |
ef261577 | 653 | { |
32836f56 | 654 | kref_put(&tvlv_handler->refcount, batadv_tvlv_handler_release); |
ef261577 ML |
655 | } |
656 | ||
657 | /** | |
658 | * batadv_tvlv_handler_get - retrieve tvlv handler from the tvlv handler list | |
659 | * based on the provided type and version (both need to match) | |
660 | * @bat_priv: the bat priv with all the soft interface information | |
661 | * @type: tvlv handler type to look for | |
662 | * @version: tvlv handler version to look for | |
663 | * | |
62fe710f | 664 | * Return: tvlv handler if found or NULL otherwise. |
ef261577 | 665 | */ |
6fc77a54 SE |
666 | static struct batadv_tvlv_handler * |
667 | batadv_tvlv_handler_get(struct batadv_priv *bat_priv, u8 type, u8 version) | |
ef261577 ML |
668 | { |
669 | struct batadv_tvlv_handler *tvlv_handler_tmp, *tvlv_handler = NULL; | |
670 | ||
671 | rcu_read_lock(); | |
672 | hlist_for_each_entry_rcu(tvlv_handler_tmp, | |
673 | &bat_priv->tvlv.handler_list, list) { | |
674 | if (tvlv_handler_tmp->type != type) | |
675 | continue; | |
676 | ||
677 | if (tvlv_handler_tmp->version != version) | |
678 | continue; | |
679 | ||
32836f56 | 680 | if (!kref_get_unless_zero(&tvlv_handler_tmp->refcount)) |
ef261577 ML |
681 | continue; |
682 | ||
683 | tvlv_handler = tvlv_handler_tmp; | |
684 | break; | |
685 | } | |
686 | rcu_read_unlock(); | |
687 | ||
688 | return tvlv_handler; | |
689 | } | |
690 | ||
f7157dd1 SE |
691 | /** |
692 | * batadv_tvlv_container_release - release tvlv from lists and free | |
693 | * @ref: kref pointer of the tvlv | |
694 | */ | |
695 | static void batadv_tvlv_container_release(struct kref *ref) | |
696 | { | |
697 | struct batadv_tvlv_container *tvlv; | |
698 | ||
699 | tvlv = container_of(ref, struct batadv_tvlv_container, refcount); | |
700 | kfree(tvlv); | |
701 | } | |
702 | ||
ef261577 | 703 | /** |
4a13147c | 704 | * batadv_tvlv_container_put - decrement the tvlv container refcounter and |
f7157dd1 | 705 | * possibly release it |
a0e28775 | 706 | * @tvlv: the tvlv container to free |
ef261577 | 707 | */ |
4a13147c | 708 | static void batadv_tvlv_container_put(struct batadv_tvlv_container *tvlv) |
ef261577 | 709 | { |
f7157dd1 | 710 | kref_put(&tvlv->refcount, batadv_tvlv_container_release); |
ef261577 ML |
711 | } |
712 | ||
713 | /** | |
714 | * batadv_tvlv_container_get - retrieve tvlv container from the tvlv container | |
715 | * list based on the provided type and version (both need to match) | |
716 | * @bat_priv: the bat priv with all the soft interface information | |
717 | * @type: tvlv container type to look for | |
718 | * @version: tvlv container version to look for | |
719 | * | |
720 | * Has to be called with the appropriate locks being acquired | |
721 | * (tvlv.container_list_lock). | |
722 | * | |
62fe710f | 723 | * Return: tvlv container if found or NULL otherwise. |
ef261577 | 724 | */ |
6fc77a54 SE |
725 | static struct batadv_tvlv_container * |
726 | batadv_tvlv_container_get(struct batadv_priv *bat_priv, u8 type, u8 version) | |
ef261577 ML |
727 | { |
728 | struct batadv_tvlv_container *tvlv_tmp, *tvlv = NULL; | |
729 | ||
dded0692 SE |
730 | lockdep_assert_held(&bat_priv->tvlv.container_list_lock); |
731 | ||
ef261577 ML |
732 | hlist_for_each_entry(tvlv_tmp, &bat_priv->tvlv.container_list, list) { |
733 | if (tvlv_tmp->tvlv_hdr.type != type) | |
734 | continue; | |
735 | ||
736 | if (tvlv_tmp->tvlv_hdr.version != version) | |
737 | continue; | |
738 | ||
f7157dd1 | 739 | if (!kref_get_unless_zero(&tvlv_tmp->refcount)) |
ef261577 ML |
740 | continue; |
741 | ||
742 | tvlv = tvlv_tmp; | |
743 | break; | |
744 | } | |
745 | ||
746 | return tvlv; | |
747 | } | |
748 | ||
749 | /** | |
750 | * batadv_tvlv_container_list_size - calculate the size of the tvlv container | |
751 | * list entries | |
752 | * @bat_priv: the bat priv with all the soft interface information | |
753 | * | |
754 | * Has to be called with the appropriate locks being acquired | |
755 | * (tvlv.container_list_lock). | |
756 | * | |
62fe710f | 757 | * Return: size of all currently registered tvlv containers in bytes. |
ef261577 | 758 | */ |
6b5e971a | 759 | static u16 batadv_tvlv_container_list_size(struct batadv_priv *bat_priv) |
ef261577 ML |
760 | { |
761 | struct batadv_tvlv_container *tvlv; | |
6b5e971a | 762 | u16 tvlv_len = 0; |
ef261577 | 763 | |
dded0692 SE |
764 | lockdep_assert_held(&bat_priv->tvlv.container_list_lock); |
765 | ||
ef261577 ML |
766 | hlist_for_each_entry(tvlv, &bat_priv->tvlv.container_list, list) { |
767 | tvlv_len += sizeof(struct batadv_tvlv_hdr); | |
768 | tvlv_len += ntohs(tvlv->tvlv_hdr.len); | |
769 | } | |
770 | ||
771 | return tvlv_len; | |
772 | } | |
773 | ||
774 | /** | |
775 | * batadv_tvlv_container_remove - remove tvlv container from the tvlv container | |
776 | * list | |
2c72d655 | 777 | * @bat_priv: the bat priv with all the soft interface information |
ef261577 ML |
778 | * @tvlv: the to be removed tvlv container |
779 | * | |
780 | * Has to be called with the appropriate locks being acquired | |
781 | * (tvlv.container_list_lock). | |
782 | */ | |
2c72d655 SE |
783 | static void batadv_tvlv_container_remove(struct batadv_priv *bat_priv, |
784 | struct batadv_tvlv_container *tvlv) | |
ef261577 | 785 | { |
008a3744 | 786 | lockdep_assert_held(&bat_priv->tvlv.container_list_lock); |
2c72d655 | 787 | |
ef261577 ML |
788 | if (!tvlv) |
789 | return; | |
790 | ||
791 | hlist_del(&tvlv->list); | |
792 | ||
793 | /* first call to decrement the counter, second call to free */ | |
4a13147c SE |
794 | batadv_tvlv_container_put(tvlv); |
795 | batadv_tvlv_container_put(tvlv); | |
ef261577 ML |
796 | } |
797 | ||
798 | /** | |
799 | * batadv_tvlv_container_unregister - unregister tvlv container based on the | |
800 | * provided type and version (both need to match) | |
801 | * @bat_priv: the bat priv with all the soft interface information | |
802 | * @type: tvlv container type to unregister | |
803 | * @version: tvlv container type to unregister | |
804 | */ | |
805 | void batadv_tvlv_container_unregister(struct batadv_priv *bat_priv, | |
6b5e971a | 806 | u8 type, u8 version) |
ef261577 ML |
807 | { |
808 | struct batadv_tvlv_container *tvlv; | |
809 | ||
810 | spin_lock_bh(&bat_priv->tvlv.container_list_lock); | |
811 | tvlv = batadv_tvlv_container_get(bat_priv, type, version); | |
2c72d655 | 812 | batadv_tvlv_container_remove(bat_priv, tvlv); |
ef261577 ML |
813 | spin_unlock_bh(&bat_priv->tvlv.container_list_lock); |
814 | } | |
815 | ||
816 | /** | |
817 | * batadv_tvlv_container_register - register tvlv type, version and content | |
818 | * to be propagated with each (primary interface) OGM | |
819 | * @bat_priv: the bat priv with all the soft interface information | |
820 | * @type: tvlv container type | |
821 | * @version: tvlv container version | |
822 | * @tvlv_value: tvlv container content | |
823 | * @tvlv_value_len: tvlv container content length | |
824 | * | |
825 | * If a container of the same type and version was already registered the new | |
826 | * content is going to replace the old one. | |
827 | */ | |
828 | void batadv_tvlv_container_register(struct batadv_priv *bat_priv, | |
6b5e971a SE |
829 | u8 type, u8 version, |
830 | void *tvlv_value, u16 tvlv_value_len) | |
ef261577 ML |
831 | { |
832 | struct batadv_tvlv_container *tvlv_old, *tvlv_new; | |
833 | ||
834 | if (!tvlv_value) | |
835 | tvlv_value_len = 0; | |
836 | ||
837 | tvlv_new = kzalloc(sizeof(*tvlv_new) + tvlv_value_len, GFP_ATOMIC); | |
838 | if (!tvlv_new) | |
839 | return; | |
840 | ||
841 | tvlv_new->tvlv_hdr.version = version; | |
842 | tvlv_new->tvlv_hdr.type = type; | |
843 | tvlv_new->tvlv_hdr.len = htons(tvlv_value_len); | |
844 | ||
845 | memcpy(tvlv_new + 1, tvlv_value, ntohs(tvlv_new->tvlv_hdr.len)); | |
846 | INIT_HLIST_NODE(&tvlv_new->list); | |
f7157dd1 | 847 | kref_init(&tvlv_new->refcount); |
ef261577 ML |
848 | |
849 | spin_lock_bh(&bat_priv->tvlv.container_list_lock); | |
850 | tvlv_old = batadv_tvlv_container_get(bat_priv, type, version); | |
2c72d655 | 851 | batadv_tvlv_container_remove(bat_priv, tvlv_old); |
ef261577 ML |
852 | hlist_add_head(&tvlv_new->list, &bat_priv->tvlv.container_list); |
853 | spin_unlock_bh(&bat_priv->tvlv.container_list_lock); | |
854 | } | |
855 | ||
856 | /** | |
3f68785e | 857 | * batadv_tvlv_realloc_packet_buff - reallocate packet buffer to accommodate |
ef261577 ML |
858 | * requested packet size |
859 | * @packet_buff: packet buffer | |
860 | * @packet_buff_len: packet buffer size | |
a0e28775 | 861 | * @min_packet_len: requested packet minimum size |
ef261577 ML |
862 | * @additional_packet_len: requested additional packet size on top of minimum |
863 | * size | |
864 | * | |
62fe710f | 865 | * Return: true of the packet buffer could be changed to the requested size, |
ef261577 ML |
866 | * false otherwise. |
867 | */ | |
868 | static bool batadv_tvlv_realloc_packet_buff(unsigned char **packet_buff, | |
869 | int *packet_buff_len, | |
870 | int min_packet_len, | |
871 | int additional_packet_len) | |
872 | { | |
873 | unsigned char *new_buff; | |
874 | ||
875 | new_buff = kmalloc(min_packet_len + additional_packet_len, GFP_ATOMIC); | |
876 | ||
877 | /* keep old buffer if kmalloc should fail */ | |
16b9ce83 MP |
878 | if (!new_buff) |
879 | return false; | |
880 | ||
881 | memcpy(new_buff, *packet_buff, min_packet_len); | |
882 | kfree(*packet_buff); | |
883 | *packet_buff = new_buff; | |
884 | *packet_buff_len = min_packet_len + additional_packet_len; | |
ef261577 | 885 | |
16b9ce83 | 886 | return true; |
ef261577 ML |
887 | } |
888 | ||
889 | /** | |
890 | * batadv_tvlv_container_ogm_append - append tvlv container content to given | |
891 | * OGM packet buffer | |
892 | * @bat_priv: the bat priv with all the soft interface information | |
893 | * @packet_buff: ogm packet buffer | |
894 | * @packet_buff_len: ogm packet buffer size including ogm header and tvlv | |
895 | * content | |
896 | * @packet_min_len: ogm header size to be preserved for the OGM itself | |
897 | * | |
898 | * The ogm packet might be enlarged or shrunk depending on the current size | |
899 | * and the size of the to-be-appended tvlv containers. | |
900 | * | |
62fe710f | 901 | * Return: size of all appended tvlv containers in bytes. |
ef261577 | 902 | */ |
6b5e971a SE |
903 | u16 batadv_tvlv_container_ogm_append(struct batadv_priv *bat_priv, |
904 | unsigned char **packet_buff, | |
905 | int *packet_buff_len, int packet_min_len) | |
ef261577 ML |
906 | { |
907 | struct batadv_tvlv_container *tvlv; | |
908 | struct batadv_tvlv_hdr *tvlv_hdr; | |
6b5e971a | 909 | u16 tvlv_value_len; |
ef261577 ML |
910 | void *tvlv_value; |
911 | bool ret; | |
912 | ||
913 | spin_lock_bh(&bat_priv->tvlv.container_list_lock); | |
914 | tvlv_value_len = batadv_tvlv_container_list_size(bat_priv); | |
915 | ||
916 | ret = batadv_tvlv_realloc_packet_buff(packet_buff, packet_buff_len, | |
917 | packet_min_len, tvlv_value_len); | |
918 | ||
919 | if (!ret) | |
920 | goto end; | |
921 | ||
922 | if (!tvlv_value_len) | |
923 | goto end; | |
924 | ||
925 | tvlv_value = (*packet_buff) + packet_min_len; | |
926 | ||
927 | hlist_for_each_entry(tvlv, &bat_priv->tvlv.container_list, list) { | |
928 | tvlv_hdr = tvlv_value; | |
929 | tvlv_hdr->type = tvlv->tvlv_hdr.type; | |
930 | tvlv_hdr->version = tvlv->tvlv_hdr.version; | |
931 | tvlv_hdr->len = tvlv->tvlv_hdr.len; | |
932 | tvlv_value = tvlv_hdr + 1; | |
933 | memcpy(tvlv_value, tvlv + 1, ntohs(tvlv->tvlv_hdr.len)); | |
6b5e971a | 934 | tvlv_value = (u8 *)tvlv_value + ntohs(tvlv->tvlv_hdr.len); |
ef261577 ML |
935 | } |
936 | ||
937 | end: | |
938 | spin_unlock_bh(&bat_priv->tvlv.container_list_lock); | |
939 | return tvlv_value_len; | |
940 | } | |
941 | ||
942 | /** | |
943 | * batadv_tvlv_call_handler - parse the given tvlv buffer to call the | |
944 | * appropriate handlers | |
945 | * @bat_priv: the bat priv with all the soft interface information | |
946 | * @tvlv_handler: tvlv callback function handling the tvlv content | |
c05a57f6 | 947 | * @ogm_source: flag indicating whether the tvlv is an ogm or a unicast packet |
ef261577 ML |
948 | * @orig_node: orig node emitting the ogm packet |
949 | * @src: source mac address of the unicast packet | |
950 | * @dst: destination mac address of the unicast packet | |
951 | * @tvlv_value: tvlv content | |
952 | * @tvlv_value_len: tvlv content length | |
953 | * | |
62fe710f | 954 | * Return: success if handler was not found or the return value of the handler |
ef261577 ML |
955 | * callback. |
956 | */ | |
957 | static int batadv_tvlv_call_handler(struct batadv_priv *bat_priv, | |
958 | struct batadv_tvlv_handler *tvlv_handler, | |
959 | bool ogm_source, | |
960 | struct batadv_orig_node *orig_node, | |
6b5e971a SE |
961 | u8 *src, u8 *dst, |
962 | void *tvlv_value, u16 tvlv_value_len) | |
ef261577 ML |
963 | { |
964 | if (!tvlv_handler) | |
965 | return NET_RX_SUCCESS; | |
966 | ||
967 | if (ogm_source) { | |
968 | if (!tvlv_handler->ogm_handler) | |
969 | return NET_RX_SUCCESS; | |
970 | ||
971 | if (!orig_node) | |
972 | return NET_RX_SUCCESS; | |
973 | ||
974 | tvlv_handler->ogm_handler(bat_priv, orig_node, | |
975 | BATADV_NO_FLAGS, | |
976 | tvlv_value, tvlv_value_len); | |
977 | tvlv_handler->flags |= BATADV_TVLV_HANDLER_OGM_CALLED; | |
978 | } else { | |
979 | if (!src) | |
980 | return NET_RX_SUCCESS; | |
981 | ||
982 | if (!dst) | |
983 | return NET_RX_SUCCESS; | |
984 | ||
985 | if (!tvlv_handler->unicast_handler) | |
986 | return NET_RX_SUCCESS; | |
987 | ||
988 | return tvlv_handler->unicast_handler(bat_priv, src, | |
989 | dst, tvlv_value, | |
990 | tvlv_value_len); | |
991 | } | |
992 | ||
993 | return NET_RX_SUCCESS; | |
994 | } | |
995 | ||
996 | /** | |
997 | * batadv_tvlv_containers_process - parse the given tvlv buffer to call the | |
998 | * appropriate handlers | |
999 | * @bat_priv: the bat priv with all the soft interface information | |
c05a57f6 | 1000 | * @ogm_source: flag indicating whether the tvlv is an ogm or a unicast packet |
ef261577 ML |
1001 | * @orig_node: orig node emitting the ogm packet |
1002 | * @src: source mac address of the unicast packet | |
1003 | * @dst: destination mac address of the unicast packet | |
1004 | * @tvlv_value: tvlv content | |
1005 | * @tvlv_value_len: tvlv content length | |
1006 | * | |
62fe710f | 1007 | * Return: success when processing an OGM or the return value of all called |
ef261577 ML |
1008 | * handler callbacks. |
1009 | */ | |
1010 | int batadv_tvlv_containers_process(struct batadv_priv *bat_priv, | |
1011 | bool ogm_source, | |
1012 | struct batadv_orig_node *orig_node, | |
6b5e971a SE |
1013 | u8 *src, u8 *dst, |
1014 | void *tvlv_value, u16 tvlv_value_len) | |
ef261577 ML |
1015 | { |
1016 | struct batadv_tvlv_handler *tvlv_handler; | |
1017 | struct batadv_tvlv_hdr *tvlv_hdr; | |
6b5e971a SE |
1018 | u16 tvlv_value_cont_len; |
1019 | u8 cifnotfound = BATADV_TVLV_HANDLER_OGM_CIFNOTFND; | |
ef261577 ML |
1020 | int ret = NET_RX_SUCCESS; |
1021 | ||
1022 | while (tvlv_value_len >= sizeof(*tvlv_hdr)) { | |
1023 | tvlv_hdr = tvlv_value; | |
1024 | tvlv_value_cont_len = ntohs(tvlv_hdr->len); | |
1025 | tvlv_value = tvlv_hdr + 1; | |
1026 | tvlv_value_len -= sizeof(*tvlv_hdr); | |
1027 | ||
1028 | if (tvlv_value_cont_len > tvlv_value_len) | |
1029 | break; | |
1030 | ||
1031 | tvlv_handler = batadv_tvlv_handler_get(bat_priv, | |
1032 | tvlv_hdr->type, | |
1033 | tvlv_hdr->version); | |
1034 | ||
1035 | ret |= batadv_tvlv_call_handler(bat_priv, tvlv_handler, | |
1036 | ogm_source, orig_node, | |
1037 | src, dst, tvlv_value, | |
1038 | tvlv_value_cont_len); | |
1039 | if (tvlv_handler) | |
ba610043 | 1040 | batadv_tvlv_handler_put(tvlv_handler); |
6b5e971a | 1041 | tvlv_value = (u8 *)tvlv_value + tvlv_value_cont_len; |
ef261577 ML |
1042 | tvlv_value_len -= tvlv_value_cont_len; |
1043 | } | |
1044 | ||
1045 | if (!ogm_source) | |
1046 | return ret; | |
1047 | ||
1048 | rcu_read_lock(); | |
1049 | hlist_for_each_entry_rcu(tvlv_handler, | |
1050 | &bat_priv->tvlv.handler_list, list) { | |
1051 | if ((tvlv_handler->flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND) && | |
1052 | !(tvlv_handler->flags & BATADV_TVLV_HANDLER_OGM_CALLED)) | |
1053 | tvlv_handler->ogm_handler(bat_priv, orig_node, | |
1054 | cifnotfound, NULL, 0); | |
1055 | ||
1056 | tvlv_handler->flags &= ~BATADV_TVLV_HANDLER_OGM_CALLED; | |
1057 | } | |
1058 | rcu_read_unlock(); | |
1059 | ||
1060 | return NET_RX_SUCCESS; | |
1061 | } | |
1062 | ||
1063 | /** | |
1064 | * batadv_tvlv_ogm_receive - process an incoming ogm and call the appropriate | |
1065 | * handlers | |
1066 | * @bat_priv: the bat priv with all the soft interface information | |
1067 | * @batadv_ogm_packet: ogm packet containing the tvlv containers | |
1068 | * @orig_node: orig node emitting the ogm packet | |
1069 | */ | |
1070 | void batadv_tvlv_ogm_receive(struct batadv_priv *bat_priv, | |
1071 | struct batadv_ogm_packet *batadv_ogm_packet, | |
1072 | struct batadv_orig_node *orig_node) | |
1073 | { | |
1074 | void *tvlv_value; | |
6b5e971a | 1075 | u16 tvlv_value_len; |
ef261577 ML |
1076 | |
1077 | if (!batadv_ogm_packet) | |
1078 | return; | |
1079 | ||
1080 | tvlv_value_len = ntohs(batadv_ogm_packet->tvlv_len); | |
1081 | if (!tvlv_value_len) | |
1082 | return; | |
1083 | ||
1084 | tvlv_value = batadv_ogm_packet + 1; | |
1085 | ||
1086 | batadv_tvlv_containers_process(bat_priv, true, orig_node, NULL, NULL, | |
1087 | tvlv_value, tvlv_value_len); | |
1088 | } | |
1089 | ||
1090 | /** | |
1091 | * batadv_tvlv_handler_register - register tvlv handler based on the provided | |
1092 | * type and version (both need to match) for ogm tvlv payload and/or unicast | |
1093 | * payload | |
1094 | * @bat_priv: the bat priv with all the soft interface information | |
1095 | * @optr: ogm tvlv handler callback function. This function receives the orig | |
1096 | * node, flags and the tvlv content as argument to process. | |
1097 | * @uptr: unicast tvlv handler callback function. This function receives the | |
1098 | * source & destination of the unicast packet as well as the tvlv content | |
1099 | * to process. | |
1100 | * @type: tvlv handler type to be registered | |
1101 | * @version: tvlv handler version to be registered | |
1102 | * @flags: flags to enable or disable TVLV API behavior | |
1103 | */ | |
1104 | void batadv_tvlv_handler_register(struct batadv_priv *bat_priv, | |
1105 | void (*optr)(struct batadv_priv *bat_priv, | |
1106 | struct batadv_orig_node *orig, | |
6b5e971a | 1107 | u8 flags, |
ef261577 | 1108 | void *tvlv_value, |
6b5e971a | 1109 | u16 tvlv_value_len), |
ef261577 | 1110 | int (*uptr)(struct batadv_priv *bat_priv, |
6b5e971a | 1111 | u8 *src, u8 *dst, |
ef261577 | 1112 | void *tvlv_value, |
6b5e971a SE |
1113 | u16 tvlv_value_len), |
1114 | u8 type, u8 version, u8 flags) | |
ef261577 ML |
1115 | { |
1116 | struct batadv_tvlv_handler *tvlv_handler; | |
1117 | ||
1118 | tvlv_handler = batadv_tvlv_handler_get(bat_priv, type, version); | |
1119 | if (tvlv_handler) { | |
ba610043 | 1120 | batadv_tvlv_handler_put(tvlv_handler); |
ef261577 ML |
1121 | return; |
1122 | } | |
1123 | ||
1124 | tvlv_handler = kzalloc(sizeof(*tvlv_handler), GFP_ATOMIC); | |
1125 | if (!tvlv_handler) | |
1126 | return; | |
1127 | ||
1128 | tvlv_handler->ogm_handler = optr; | |
1129 | tvlv_handler->unicast_handler = uptr; | |
1130 | tvlv_handler->type = type; | |
1131 | tvlv_handler->version = version; | |
1132 | tvlv_handler->flags = flags; | |
32836f56 | 1133 | kref_init(&tvlv_handler->refcount); |
ef261577 ML |
1134 | INIT_HLIST_NODE(&tvlv_handler->list); |
1135 | ||
1136 | spin_lock_bh(&bat_priv->tvlv.handler_list_lock); | |
1137 | hlist_add_head_rcu(&tvlv_handler->list, &bat_priv->tvlv.handler_list); | |
1138 | spin_unlock_bh(&bat_priv->tvlv.handler_list_lock); | |
1139 | } | |
1140 | ||
1141 | /** | |
1142 | * batadv_tvlv_handler_unregister - unregister tvlv handler based on the | |
1143 | * provided type and version (both need to match) | |
1144 | * @bat_priv: the bat priv with all the soft interface information | |
1145 | * @type: tvlv handler type to be unregistered | |
1146 | * @version: tvlv handler version to be unregistered | |
1147 | */ | |
1148 | void batadv_tvlv_handler_unregister(struct batadv_priv *bat_priv, | |
6b5e971a | 1149 | u8 type, u8 version) |
ef261577 ML |
1150 | { |
1151 | struct batadv_tvlv_handler *tvlv_handler; | |
1152 | ||
1153 | tvlv_handler = batadv_tvlv_handler_get(bat_priv, type, version); | |
1154 | if (!tvlv_handler) | |
1155 | return; | |
1156 | ||
ba610043 | 1157 | batadv_tvlv_handler_put(tvlv_handler); |
ef261577 ML |
1158 | spin_lock_bh(&bat_priv->tvlv.handler_list_lock); |
1159 | hlist_del_rcu(&tvlv_handler->list); | |
1160 | spin_unlock_bh(&bat_priv->tvlv.handler_list_lock); | |
ba610043 | 1161 | batadv_tvlv_handler_put(tvlv_handler); |
ef261577 ML |
1162 | } |
1163 | ||
1164 | /** | |
1165 | * batadv_tvlv_unicast_send - send a unicast packet with tvlv payload to the | |
1166 | * specified host | |
1167 | * @bat_priv: the bat priv with all the soft interface information | |
1168 | * @src: source mac address of the unicast packet | |
1169 | * @dst: destination mac address of the unicast packet | |
1170 | * @type: tvlv type | |
1171 | * @version: tvlv version | |
1172 | * @tvlv_value: tvlv content | |
1173 | * @tvlv_value_len: tvlv content length | |
1174 | */ | |
6b5e971a SE |
1175 | void batadv_tvlv_unicast_send(struct batadv_priv *bat_priv, u8 *src, |
1176 | u8 *dst, u8 type, u8 version, | |
1177 | void *tvlv_value, u16 tvlv_value_len) | |
ef261577 ML |
1178 | { |
1179 | struct batadv_unicast_tvlv_packet *unicast_tvlv_packet; | |
1180 | struct batadv_tvlv_hdr *tvlv_hdr; | |
1181 | struct batadv_orig_node *orig_node; | |
8bbb7cb2 | 1182 | struct sk_buff *skb; |
ef261577 ML |
1183 | unsigned char *tvlv_buff; |
1184 | unsigned int tvlv_len; | |
1185 | ssize_t hdr_len = sizeof(*unicast_tvlv_packet); | |
ef261577 ML |
1186 | |
1187 | orig_node = batadv_orig_hash_find(bat_priv, dst); | |
1188 | if (!orig_node) | |
8bbb7cb2 | 1189 | return; |
ef261577 ML |
1190 | |
1191 | tvlv_len = sizeof(*tvlv_hdr) + tvlv_value_len; | |
1192 | ||
1193 | skb = netdev_alloc_skb_ip_align(NULL, ETH_HLEN + hdr_len + tvlv_len); | |
1194 | if (!skb) | |
1195 | goto out; | |
1196 | ||
1197 | skb->priority = TC_PRIO_CONTROL; | |
1198 | skb_reserve(skb, ETH_HLEN); | |
1199 | tvlv_buff = skb_put(skb, sizeof(*unicast_tvlv_packet) + tvlv_len); | |
1200 | unicast_tvlv_packet = (struct batadv_unicast_tvlv_packet *)tvlv_buff; | |
a40d9b07 SW |
1201 | unicast_tvlv_packet->packet_type = BATADV_UNICAST_TVLV; |
1202 | unicast_tvlv_packet->version = BATADV_COMPAT_VERSION; | |
1203 | unicast_tvlv_packet->ttl = BATADV_TTL; | |
ef261577 ML |
1204 | unicast_tvlv_packet->reserved = 0; |
1205 | unicast_tvlv_packet->tvlv_len = htons(tvlv_len); | |
1206 | unicast_tvlv_packet->align = 0; | |
8fdd0153 AQ |
1207 | ether_addr_copy(unicast_tvlv_packet->src, src); |
1208 | ether_addr_copy(unicast_tvlv_packet->dst, dst); | |
ef261577 ML |
1209 | |
1210 | tvlv_buff = (unsigned char *)(unicast_tvlv_packet + 1); | |
1211 | tvlv_hdr = (struct batadv_tvlv_hdr *)tvlv_buff; | |
1212 | tvlv_hdr->version = version; | |
1213 | tvlv_hdr->type = type; | |
1214 | tvlv_hdr->len = htons(tvlv_value_len); | |
1215 | tvlv_buff += sizeof(*tvlv_hdr); | |
1216 | memcpy(tvlv_buff, tvlv_value, tvlv_value_len); | |
1217 | ||
8bbb7cb2 | 1218 | if (batadv_send_skb_to_orig(skb, orig_node, NULL) == NET_XMIT_DROP) |
ef261577 | 1219 | kfree_skb(skb); |
8bbb7cb2 | 1220 | out: |
5d967310 | 1221 | batadv_orig_node_put(orig_node); |
ef261577 ML |
1222 | } |
1223 | ||
c018ad3d AQ |
1224 | /** |
1225 | * batadv_get_vid - extract the VLAN identifier from skb if any | |
1226 | * @skb: the buffer containing the packet | |
1227 | * @header_len: length of the batman header preceding the ethernet header | |
1228 | * | |
62fe710f SE |
1229 | * Return: VID with the BATADV_VLAN_HAS_TAG flag when the packet embedded in the |
1230 | * skb is vlan tagged. Otherwise BATADV_NO_FLAGS. | |
c018ad3d AQ |
1231 | */ |
1232 | unsigned short batadv_get_vid(struct sk_buff *skb, size_t header_len) | |
1233 | { | |
1234 | struct ethhdr *ethhdr = (struct ethhdr *)(skb->data + header_len); | |
1235 | struct vlan_ethhdr *vhdr; | |
1236 | unsigned short vid; | |
1237 | ||
1238 | if (ethhdr->h_proto != htons(ETH_P_8021Q)) | |
1239 | return BATADV_NO_FLAGS; | |
1240 | ||
1241 | if (!pskb_may_pull(skb, header_len + VLAN_ETH_HLEN)) | |
1242 | return BATADV_NO_FLAGS; | |
1243 | ||
1244 | vhdr = (struct vlan_ethhdr *)(skb->data + header_len); | |
1245 | vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK; | |
1246 | vid |= BATADV_VLAN_HAS_TAG; | |
1247 | ||
1248 | return vid; | |
1249 | } | |
1250 | ||
eceb22ae AQ |
1251 | /** |
1252 | * batadv_vlan_ap_isola_get - return the AP isolation status for the given vlan | |
1253 | * @bat_priv: the bat priv with all the soft interface information | |
1254 | * @vid: the VLAN identifier for which the AP isolation attributed as to be | |
1255 | * looked up | |
1256 | * | |
62fe710f | 1257 | * Return: true if AP isolation is on for the VLAN idenfied by vid, false |
eceb22ae AQ |
1258 | * otherwise |
1259 | */ | |
1260 | bool batadv_vlan_ap_isola_get(struct batadv_priv *bat_priv, unsigned short vid) | |
1261 | { | |
1262 | bool ap_isolation_enabled = false; | |
1263 | struct batadv_softif_vlan *vlan; | |
1264 | ||
1265 | /* if the AP isolation is requested on a VLAN, then check for its | |
1266 | * setting in the proper VLAN private data structure | |
1267 | */ | |
1268 | vlan = batadv_softif_vlan_get(bat_priv, vid); | |
1269 | if (vlan) { | |
1270 | ap_isolation_enabled = atomic_read(&vlan->ap_isolation); | |
9c3bf081 | 1271 | batadv_softif_vlan_put(vlan); |
eceb22ae AQ |
1272 | } |
1273 | ||
1274 | return ap_isolation_enabled; | |
1275 | } | |
1276 | ||
ee11ad61 | 1277 | static int batadv_param_set_ra(const char *val, const struct kernel_param *kp) |
d419be1f | 1278 | { |
56303d34 | 1279 | struct batadv_algo_ops *bat_algo_ops; |
d8cb5486 ML |
1280 | char *algo_name = (char *)val; |
1281 | size_t name_len = strlen(algo_name); | |
d419be1f | 1282 | |
293c9c1c | 1283 | if (name_len > 0 && algo_name[name_len - 1] == '\n') |
d8cb5486 ML |
1284 | algo_name[name_len - 1] = '\0'; |
1285 | ||
ee11ad61 | 1286 | bat_algo_ops = batadv_algo_get(algo_name); |
d419be1f | 1287 | if (!bat_algo_ops) { |
d8cb5486 | 1288 | pr_err("Routing algorithm '%s' is not supported\n", algo_name); |
d419be1f ML |
1289 | return -EINVAL; |
1290 | } | |
1291 | ||
d8cb5486 | 1292 | return param_set_copystring(algo_name, kp); |
d419be1f ML |
1293 | } |
1294 | ||
ee11ad61 SE |
1295 | static const struct kernel_param_ops batadv_param_ops_ra = { |
1296 | .set = batadv_param_set_ra, | |
d419be1f ML |
1297 | .get = param_get_string, |
1298 | }; | |
1299 | ||
ee11ad61 | 1300 | static struct kparam_string batadv_param_string_ra = { |
3193e8fd SE |
1301 | .maxlen = sizeof(batadv_routing_algo), |
1302 | .string = batadv_routing_algo, | |
d419be1f ML |
1303 | }; |
1304 | ||
ee11ad61 SE |
1305 | module_param_cb(routing_algo, &batadv_param_ops_ra, &batadv_param_string_ra, |
1306 | 0644); | |
1307 | module_init(batadv_init); | |
1308 | module_exit(batadv_exit); | |
c6c8fea2 SE |
1309 | |
1310 | MODULE_LICENSE("GPL"); | |
1311 | ||
42d0b044 SE |
1312 | MODULE_AUTHOR(BATADV_DRIVER_AUTHOR); |
1313 | MODULE_DESCRIPTION(BATADV_DRIVER_DESC); | |
1314 | MODULE_SUPPORTED_DEVICE(BATADV_DRIVER_DEVICE); | |
1315 | MODULE_VERSION(BATADV_SOURCE_VERSION); |