Commit | Line | Data |
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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 SE |
33 | #include <linux/list.h> |
34 | #include <linux/module.h> | |
1e2c2a4f | 35 | #include <linux/netdevice.h> |
ba412080 | 36 | #include <linux/printk.h> |
1e2c2a4f SE |
37 | #include <linux/rculist.h> |
38 | #include <linux/rcupdate.h> | |
39 | #include <linux/seq_file.h> | |
40 | #include <linux/skbuff.h> | |
1e2c2a4f SE |
41 | #include <linux/spinlock.h> |
42 | #include <linux/stddef.h> | |
43 | #include <linux/string.h> | |
44 | #include <linux/workqueue.h> | |
c54f38c9 | 45 | #include <net/dsfield.h> |
1e2c2a4f SE |
46 | #include <net/rtnetlink.h> |
47 | ||
48 | #include "bat_algo.h" | |
a2d08166 SE |
49 | #include "bat_iv_ogm.h" |
50 | #include "bat_v.h" | |
1e2c2a4f | 51 | #include "bridge_loop_avoidance.h" |
b706b13b | 52 | #include "debugfs.h" |
1e2c2a4f SE |
53 | #include "distributed-arp-table.h" |
54 | #include "gateway_client.h" | |
55 | #include "gateway_common.h" | |
56 | #include "hard-interface.h" | |
57 | #include "icmp_socket.h" | |
ba412080 | 58 | #include "log.h" |
1e2c2a4f | 59 | #include "multicast.h" |
09748a22 | 60 | #include "netlink.h" |
1e2c2a4f SE |
61 | #include "network-coding.h" |
62 | #include "originator.h" | |
63 | #include "packet.h" | |
c6c8fea2 SE |
64 | #include "routing.h" |
65 | #include "send.h" | |
c6c8fea2 | 66 | #include "soft-interface.h" |
33a3bb4a | 67 | #include "tp_meter.h" |
c6c8fea2 | 68 | #include "translation-table.h" |
c6c8fea2 | 69 | |
c3caf519 | 70 | /* List manipulations on hardif_list have to be rtnl_lock()'ed, |
9cfc7bd6 SE |
71 | * list traversals just rcu-locked |
72 | */ | |
3193e8fd | 73 | struct list_head batadv_hardif_list; |
ee11ad61 | 74 | static int (*batadv_rx_handler[256])(struct sk_buff *, |
56303d34 | 75 | struct batadv_hard_iface *); |
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 | { |
86452f81 SE |
85 | int ret; |
86 | ||
87 | ret = batadv_tt_cache_init(); | |
88 | if (ret < 0) | |
89 | return ret; | |
90 | ||
3193e8fd | 91 | INIT_LIST_HEAD(&batadv_hardif_list); |
01d350d1 | 92 | batadv_algo_init(); |
1c280471 | 93 | |
ee11ad61 | 94 | batadv_recv_handler_init(); |
ffa995e0 | 95 | |
d6f94d91 | 96 | batadv_v_init(); |
81c524f7 | 97 | batadv_iv_init(); |
6c519bad | 98 | batadv_nc_init(); |
33a3bb4a | 99 | batadv_tp_meter_init(); |
c6c8fea2 | 100 | |
3193e8fd | 101 | batadv_event_workqueue = create_singlethread_workqueue("bat_events"); |
3193e8fd | 102 | if (!batadv_event_workqueue) |
86452f81 | 103 | goto err_create_wq; |
c6c8fea2 | 104 | |
9039dc7e | 105 | batadv_socket_init(); |
40a072d7 | 106 | batadv_debugfs_init(); |
c6c8fea2 | 107 | |
9563877e | 108 | register_netdevice_notifier(&batadv_hard_if_notifier); |
a4ac28c0 | 109 | rtnl_link_register(&batadv_link_ops); |
09748a22 | 110 | batadv_netlink_register(); |
c6c8fea2 | 111 | |
86ceb360 | 112 | pr_info("B.A.T.M.A.N. advanced %s (compatibility version %i) loaded\n", |
42d0b044 | 113 | BATADV_SOURCE_VERSION, BATADV_COMPAT_VERSION); |
c6c8fea2 SE |
114 | |
115 | return 0; | |
86452f81 SE |
116 | |
117 | err_create_wq: | |
118 | batadv_tt_cache_destroy(); | |
119 | ||
120 | return -ENOMEM; | |
c6c8fea2 SE |
121 | } |
122 | ||
ee11ad61 | 123 | static void __exit batadv_exit(void) |
c6c8fea2 | 124 | { |
40a072d7 | 125 | batadv_debugfs_destroy(); |
09748a22 | 126 | batadv_netlink_unregister(); |
a4ac28c0 | 127 | rtnl_link_unregister(&batadv_link_ops); |
9563877e SE |
128 | unregister_netdevice_notifier(&batadv_hard_if_notifier); |
129 | batadv_hardif_remove_interfaces(); | |
c6c8fea2 | 130 | |
3193e8fd SE |
131 | flush_workqueue(batadv_event_workqueue); |
132 | destroy_workqueue(batadv_event_workqueue); | |
133 | batadv_event_workqueue = NULL; | |
c6c8fea2 SE |
134 | |
135 | rcu_barrier(); | |
86452f81 SE |
136 | |
137 | batadv_tt_cache_destroy(); | |
c6c8fea2 SE |
138 | } |
139 | ||
3193e8fd | 140 | int batadv_mesh_init(struct net_device *soft_iface) |
c6c8fea2 | 141 | { |
56303d34 | 142 | struct batadv_priv *bat_priv = netdev_priv(soft_iface); |
5346c35e | 143 | int ret; |
c6c8fea2 | 144 | |
c6c8fea2 SE |
145 | spin_lock_init(&bat_priv->forw_bat_list_lock); |
146 | spin_lock_init(&bat_priv->forw_bcast_list_lock); | |
807736f6 SE |
147 | spin_lock_init(&bat_priv->tt.changes_list_lock); |
148 | spin_lock_init(&bat_priv->tt.req_list_lock); | |
149 | spin_lock_init(&bat_priv->tt.roam_list_lock); | |
150 | spin_lock_init(&bat_priv->tt.last_changeset_lock); | |
a70a9aa9 | 151 | spin_lock_init(&bat_priv->tt.commit_lock); |
807736f6 | 152 | spin_lock_init(&bat_priv->gw.list_lock); |
ab49886e LL |
153 | #ifdef CONFIG_BATMAN_ADV_MCAST |
154 | spin_lock_init(&bat_priv->mcast.want_lists_lock); | |
155 | #endif | |
ef261577 ML |
156 | spin_lock_init(&bat_priv->tvlv.container_list_lock); |
157 | spin_lock_init(&bat_priv->tvlv.handler_list_lock); | |
5d2c05b2 | 158 | spin_lock_init(&bat_priv->softif_vlan_list_lock); |
33a3bb4a | 159 | spin_lock_init(&bat_priv->tp_list_lock); |
c6c8fea2 SE |
160 | |
161 | INIT_HLIST_HEAD(&bat_priv->forw_bat_list); | |
162 | INIT_HLIST_HEAD(&bat_priv->forw_bcast_list); | |
807736f6 | 163 | INIT_HLIST_HEAD(&bat_priv->gw.list); |
ab49886e LL |
164 | #ifdef CONFIG_BATMAN_ADV_MCAST |
165 | INIT_HLIST_HEAD(&bat_priv->mcast.want_all_unsnoopables_list); | |
4c8755d6 LL |
166 | INIT_HLIST_HEAD(&bat_priv->mcast.want_all_ipv4_list); |
167 | INIT_HLIST_HEAD(&bat_priv->mcast.want_all_ipv6_list); | |
ab49886e | 168 | #endif |
807736f6 | 169 | INIT_LIST_HEAD(&bat_priv->tt.changes_list); |
7c26a53b | 170 | INIT_HLIST_HEAD(&bat_priv->tt.req_list); |
807736f6 | 171 | INIT_LIST_HEAD(&bat_priv->tt.roam_list); |
c5caf4ef LL |
172 | #ifdef CONFIG_BATMAN_ADV_MCAST |
173 | INIT_HLIST_HEAD(&bat_priv->mcast.mla_list); | |
174 | #endif | |
ef261577 ML |
175 | INIT_HLIST_HEAD(&bat_priv->tvlv.container_list); |
176 | INIT_HLIST_HEAD(&bat_priv->tvlv.handler_list); | |
5d2c05b2 | 177 | INIT_HLIST_HEAD(&bat_priv->softif_vlan_list); |
33a3bb4a | 178 | INIT_HLIST_HEAD(&bat_priv->tp_list); |
c6c8fea2 | 179 | |
0da00359 AQ |
180 | ret = batadv_v_mesh_init(bat_priv); |
181 | if (ret < 0) | |
182 | goto err; | |
183 | ||
7d211efc | 184 | ret = batadv_originator_init(bat_priv); |
5346c35e | 185 | if (ret < 0) |
c6c8fea2 SE |
186 | goto err; |
187 | ||
08c36d3e | 188 | ret = batadv_tt_init(bat_priv); |
5346c35e | 189 | if (ret < 0) |
c6c8fea2 SE |
190 | goto err; |
191 | ||
08adf151 | 192 | ret = batadv_bla_init(bat_priv); |
5346c35e | 193 | if (ret < 0) |
23721387 SW |
194 | goto err; |
195 | ||
2f1dfbe1 AQ |
196 | ret = batadv_dat_init(bat_priv); |
197 | if (ret < 0) | |
198 | goto err; | |
199 | ||
6c519bad | 200 | ret = batadv_nc_mesh_init(bat_priv); |
d353d8d4 MH |
201 | if (ret < 0) |
202 | goto err; | |
203 | ||
414254e3 | 204 | batadv_gw_init(bat_priv); |
60432d75 | 205 | batadv_mcast_init(bat_priv); |
414254e3 | 206 | |
807736f6 | 207 | atomic_set(&bat_priv->gw.reselect, 0); |
39c75a51 | 208 | atomic_set(&bat_priv->mesh_state, BATADV_MESH_ACTIVE); |
5346c35e SE |
209 | |
210 | return 0; | |
c6c8fea2 SE |
211 | |
212 | err: | |
3193e8fd | 213 | batadv_mesh_free(soft_iface); |
5346c35e | 214 | return ret; |
c6c8fea2 SE |
215 | } |
216 | ||
3193e8fd | 217 | void batadv_mesh_free(struct net_device *soft_iface) |
c6c8fea2 | 218 | { |
56303d34 | 219 | struct batadv_priv *bat_priv = netdev_priv(soft_iface); |
c6c8fea2 | 220 | |
39c75a51 | 221 | atomic_set(&bat_priv->mesh_state, BATADV_MESH_DEACTIVATING); |
c6c8fea2 | 222 | |
9455e34c | 223 | batadv_purge_outstanding_packets(bat_priv, NULL); |
c6c8fea2 | 224 | |
bd3524c1 | 225 | batadv_gw_node_free(bat_priv); |
0da00359 AQ |
226 | |
227 | batadv_v_mesh_free(bat_priv); | |
6c519bad | 228 | batadv_nc_mesh_free(bat_priv); |
a4361860 AQ |
229 | batadv_dat_free(bat_priv); |
230 | batadv_bla_free(bat_priv); | |
c6c8fea2 | 231 | |
c5caf4ef LL |
232 | batadv_mcast_free(bat_priv); |
233 | ||
a4361860 AQ |
234 | /* Free the TT and the originator tables only after having terminated |
235 | * all the other depending components which may use these structures for | |
236 | * their purposes. | |
237 | */ | |
08c36d3e | 238 | batadv_tt_free(bat_priv); |
c6c8fea2 | 239 | |
a4361860 AQ |
240 | /* Since the originator table clean up routine is accessing the TT |
241 | * tables as well, it has to be invoked after the TT tables have been | |
242 | * freed and marked as empty. This ensures that no cleanup RCU callbacks | |
243 | * accessing the TT data are scheduled for later execution. | |
244 | */ | |
245 | batadv_originator_free(bat_priv); | |
2f1dfbe1 | 246 | |
414254e3 ML |
247 | batadv_gw_free(bat_priv); |
248 | ||
f8214865 | 249 | free_percpu(bat_priv->bat_counters); |
f69ae770 | 250 | bat_priv->bat_counters = NULL; |
f8214865 | 251 | |
39c75a51 | 252 | atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE); |
c6c8fea2 SE |
253 | } |
254 | ||
6e0895c2 DM |
255 | /** |
256 | * batadv_is_my_mac - check if the given mac address belongs to any of the real | |
257 | * interfaces in the current mesh | |
258 | * @bat_priv: the bat priv with all the soft interface information | |
259 | * @addr: the address to check | |
e8ad3b1a | 260 | * |
62fe710f | 261 | * Return: 'true' if the mac address was found, false otherwise. |
6e0895c2 | 262 | */ |
6b5e971a | 263 | bool batadv_is_my_mac(struct batadv_priv *bat_priv, const u8 *addr) |
c6c8fea2 | 264 | { |
56303d34 | 265 | const struct batadv_hard_iface *hard_iface; |
e8ad3b1a | 266 | bool is_my_mac = false; |
c6c8fea2 SE |
267 | |
268 | rcu_read_lock(); | |
3193e8fd | 269 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e9a4f295 | 270 | if (hard_iface->if_status != BATADV_IF_ACTIVE) |
c6c8fea2 SE |
271 | continue; |
272 | ||
fe8a93b9 AQ |
273 | if (hard_iface->soft_iface != bat_priv->soft_iface) |
274 | continue; | |
275 | ||
1eda58bf | 276 | if (batadv_compare_eth(hard_iface->net_dev->dev_addr, addr)) { |
e8ad3b1a MP |
277 | is_my_mac = true; |
278 | break; | |
c6c8fea2 SE |
279 | } |
280 | } | |
281 | rcu_read_unlock(); | |
e8ad3b1a | 282 | return is_my_mac; |
c6c8fea2 SE |
283 | } |
284 | ||
dc1cbd14 | 285 | #ifdef CONFIG_BATMAN_ADV_DEBUGFS |
30da63a6 ML |
286 | /** |
287 | * batadv_seq_print_text_primary_if_get - called from debugfs table printing | |
288 | * function that requires the primary interface | |
289 | * @seq: debugfs table seq_file struct | |
290 | * | |
62fe710f | 291 | * Return: primary interface if found or NULL otherwise. |
30da63a6 ML |
292 | */ |
293 | struct batadv_hard_iface * | |
294 | batadv_seq_print_text_primary_if_get(struct seq_file *seq) | |
295 | { | |
296 | struct net_device *net_dev = (struct net_device *)seq->private; | |
297 | struct batadv_priv *bat_priv = netdev_priv(net_dev); | |
298 | struct batadv_hard_iface *primary_if; | |
299 | ||
300 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
301 | ||
302 | if (!primary_if) { | |
303 | seq_printf(seq, | |
304 | "BATMAN mesh %s disabled - please specify interfaces to enable it\n", | |
305 | net_dev->name); | |
306 | goto out; | |
307 | } | |
308 | ||
309 | if (primary_if->if_status == BATADV_IF_ACTIVE) | |
310 | goto out; | |
311 | ||
312 | seq_printf(seq, | |
313 | "BATMAN mesh %s disabled - primary interface not active\n", | |
314 | net_dev->name); | |
82047ad7 | 315 | batadv_hardif_put(primary_if); |
30da63a6 ML |
316 | primary_if = NULL; |
317 | ||
318 | out: | |
319 | return primary_if; | |
320 | } | |
dc1cbd14 | 321 | #endif |
30da63a6 | 322 | |
411d6ed9 ML |
323 | /** |
324 | * batadv_max_header_len - calculate maximum encapsulation overhead for a | |
325 | * payload packet | |
326 | * | |
62fe710f | 327 | * Return: the maximum encapsulation overhead in bytes. |
411d6ed9 ML |
328 | */ |
329 | int batadv_max_header_len(void) | |
330 | { | |
331 | int header_len = 0; | |
332 | ||
333 | header_len = max_t(int, header_len, | |
334 | sizeof(struct batadv_unicast_packet)); | |
335 | header_len = max_t(int, header_len, | |
336 | sizeof(struct batadv_unicast_4addr_packet)); | |
337 | header_len = max_t(int, header_len, | |
338 | sizeof(struct batadv_bcast_packet)); | |
339 | ||
340 | #ifdef CONFIG_BATMAN_ADV_NC | |
341 | header_len = max_t(int, header_len, | |
342 | sizeof(struct batadv_coded_packet)); | |
343 | #endif | |
344 | ||
1df0cbd5 | 345 | return header_len + ETH_HLEN; |
411d6ed9 ML |
346 | } |
347 | ||
c54f38c9 SW |
348 | /** |
349 | * batadv_skb_set_priority - sets skb priority according to packet content | |
350 | * @skb: the packet to be sent | |
351 | * @offset: offset to the packet content | |
352 | * | |
353 | * This function sets a value between 256 and 263 (802.1d priority), which | |
354 | * can be interpreted by the cfg80211 or other drivers. | |
355 | */ | |
356 | void batadv_skb_set_priority(struct sk_buff *skb, int offset) | |
357 | { | |
358 | struct iphdr ip_hdr_tmp, *ip_hdr; | |
359 | struct ipv6hdr ip6_hdr_tmp, *ip6_hdr; | |
360 | struct ethhdr ethhdr_tmp, *ethhdr; | |
361 | struct vlan_ethhdr *vhdr, vhdr_tmp; | |
362 | u32 prio; | |
363 | ||
364 | /* already set, do nothing */ | |
365 | if (skb->priority >= 256 && skb->priority <= 263) | |
366 | return; | |
367 | ||
368 | ethhdr = skb_header_pointer(skb, offset, sizeof(*ethhdr), ðhdr_tmp); | |
369 | if (!ethhdr) | |
370 | return; | |
371 | ||
372 | switch (ethhdr->h_proto) { | |
373 | case htons(ETH_P_8021Q): | |
374 | vhdr = skb_header_pointer(skb, offset + sizeof(*vhdr), | |
375 | sizeof(*vhdr), &vhdr_tmp); | |
376 | if (!vhdr) | |
377 | return; | |
378 | prio = ntohs(vhdr->h_vlan_TCI) & VLAN_PRIO_MASK; | |
379 | prio = prio >> VLAN_PRIO_SHIFT; | |
380 | break; | |
381 | case htons(ETH_P_IP): | |
382 | ip_hdr = skb_header_pointer(skb, offset + sizeof(*ethhdr), | |
383 | sizeof(*ip_hdr), &ip_hdr_tmp); | |
384 | if (!ip_hdr) | |
385 | return; | |
386 | prio = (ipv4_get_dsfield(ip_hdr) & 0xfc) >> 5; | |
387 | break; | |
388 | case htons(ETH_P_IPV6): | |
389 | ip6_hdr = skb_header_pointer(skb, offset + sizeof(*ethhdr), | |
390 | sizeof(*ip6_hdr), &ip6_hdr_tmp); | |
391 | if (!ip6_hdr) | |
392 | return; | |
393 | prio = (ipv6_get_dsfield(ip6_hdr) & 0xfc) >> 5; | |
394 | break; | |
395 | default: | |
396 | return; | |
397 | } | |
398 | ||
399 | skb->priority = prio + 256; | |
400 | } | |
401 | ||
ee11ad61 | 402 | static int batadv_recv_unhandled_packet(struct sk_buff *skb, |
56303d34 | 403 | struct batadv_hard_iface *recv_if) |
ffa995e0 ML |
404 | { |
405 | return NET_RX_DROP; | |
406 | } | |
407 | ||
408 | /* incoming packets with the batman ethertype received on any active hard | |
409 | * interface | |
410 | */ | |
3193e8fd SE |
411 | int batadv_batman_skb_recv(struct sk_buff *skb, struct net_device *dev, |
412 | struct packet_type *ptype, | |
413 | struct net_device *orig_dev) | |
ffa995e0 | 414 | { |
56303d34 | 415 | struct batadv_priv *bat_priv; |
96412690 | 416 | struct batadv_ogm_packet *batadv_ogm_packet; |
56303d34 | 417 | struct batadv_hard_iface *hard_iface; |
6b5e971a | 418 | u8 idx; |
ffa995e0 ML |
419 | int ret; |
420 | ||
56303d34 SE |
421 | hard_iface = container_of(ptype, struct batadv_hard_iface, |
422 | batman_adv_ptype); | |
4fe56e60 SE |
423 | |
424 | /* Prevent processing a packet received on an interface which is getting | |
425 | * shut down otherwise the packet may trigger de-reference errors | |
426 | * further down in the receive path. | |
427 | */ | |
428 | if (!kref_get_unless_zero(&hard_iface->refcount)) | |
429 | goto err_out; | |
430 | ||
ffa995e0 ML |
431 | skb = skb_share_check(skb, GFP_ATOMIC); |
432 | ||
433 | /* skb was released by skb_share_check() */ | |
434 | if (!skb) | |
4fe56e60 | 435 | goto err_put; |
ffa995e0 ML |
436 | |
437 | /* packet should hold at least type and version */ | |
438 | if (unlikely(!pskb_may_pull(skb, 2))) | |
439 | goto err_free; | |
440 | ||
441 | /* expect a valid ethernet header here. */ | |
442 | if (unlikely(skb->mac_len != ETH_HLEN || !skb_mac_header(skb))) | |
443 | goto err_free; | |
444 | ||
445 | if (!hard_iface->soft_iface) | |
446 | goto err_free; | |
447 | ||
448 | bat_priv = netdev_priv(hard_iface->soft_iface); | |
449 | ||
39c75a51 | 450 | if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) |
ffa995e0 ML |
451 | goto err_free; |
452 | ||
453 | /* discard frames on not active interfaces */ | |
e9a4f295 | 454 | if (hard_iface->if_status != BATADV_IF_ACTIVE) |
ffa995e0 ML |
455 | goto err_free; |
456 | ||
96412690 | 457 | batadv_ogm_packet = (struct batadv_ogm_packet *)skb->data; |
ffa995e0 | 458 | |
a40d9b07 | 459 | if (batadv_ogm_packet->version != BATADV_COMPAT_VERSION) { |
39c75a51 | 460 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 461 | "Drop packet: incompatible batman version (%i)\n", |
a40d9b07 | 462 | batadv_ogm_packet->version); |
ffa995e0 ML |
463 | goto err_free; |
464 | } | |
465 | ||
e0d9677e MH |
466 | /* reset control block to avoid left overs from previous users */ |
467 | memset(skb->cb, 0, sizeof(struct batadv_skb_cb)); | |
468 | ||
ffa995e0 ML |
469 | /* all receive handlers return whether they received or reused |
470 | * the supplied skb. if not, we have to free the skb. | |
471 | */ | |
a40d9b07 | 472 | idx = batadv_ogm_packet->packet_type; |
ee11ad61 | 473 | ret = (*batadv_rx_handler[idx])(skb, hard_iface); |
ffa995e0 ML |
474 | |
475 | if (ret == NET_RX_DROP) | |
476 | kfree_skb(skb); | |
477 | ||
4fe56e60 SE |
478 | batadv_hardif_put(hard_iface); |
479 | ||
ffa995e0 ML |
480 | /* return NET_RX_SUCCESS in any case as we |
481 | * most probably dropped the packet for | |
482 | * routing-logical reasons. | |
483 | */ | |
484 | return NET_RX_SUCCESS; | |
485 | ||
486 | err_free: | |
487 | kfree_skb(skb); | |
4fe56e60 SE |
488 | err_put: |
489 | batadv_hardif_put(hard_iface); | |
ffa995e0 ML |
490 | err_out: |
491 | return NET_RX_DROP; | |
492 | } | |
493 | ||
ee11ad61 | 494 | static void batadv_recv_handler_init(void) |
ffa995e0 ML |
495 | { |
496 | int i; | |
497 | ||
ee11ad61 SE |
498 | for (i = 0; i < ARRAY_SIZE(batadv_rx_handler); i++) |
499 | batadv_rx_handler[i] = batadv_recv_unhandled_packet; | |
ffa995e0 | 500 | |
a1f1ac5c SW |
501 | for (i = BATADV_UNICAST_MIN; i <= BATADV_UNICAST_MAX; i++) |
502 | batadv_rx_handler[i] = batadv_recv_unhandled_unicast_packet; | |
503 | ||
031ace8d SW |
504 | /* compile time checks for sizes */ |
505 | BUILD_BUG_ON(sizeof(struct batadv_bla_claim_dst) != 6); | |
506 | BUILD_BUG_ON(sizeof(struct batadv_ogm_packet) != 24); | |
507 | BUILD_BUG_ON(sizeof(struct batadv_icmp_header) != 20); | |
508 | BUILD_BUG_ON(sizeof(struct batadv_icmp_packet) != 20); | |
509 | BUILD_BUG_ON(sizeof(struct batadv_icmp_packet_rr) != 116); | |
510 | BUILD_BUG_ON(sizeof(struct batadv_unicast_packet) != 10); | |
511 | BUILD_BUG_ON(sizeof(struct batadv_unicast_4addr_packet) != 18); | |
512 | BUILD_BUG_ON(sizeof(struct batadv_frag_packet) != 20); | |
513 | BUILD_BUG_ON(sizeof(struct batadv_bcast_packet) != 14); | |
514 | BUILD_BUG_ON(sizeof(struct batadv_coded_packet) != 46); | |
515 | BUILD_BUG_ON(sizeof(struct batadv_unicast_tvlv_packet) != 20); | |
516 | BUILD_BUG_ON(sizeof(struct batadv_tvlv_hdr) != 4); | |
517 | BUILD_BUG_ON(sizeof(struct batadv_tvlv_gateway_data) != 8); | |
518 | BUILD_BUG_ON(sizeof(struct batadv_tvlv_tt_vlan_data) != 8); | |
519 | BUILD_BUG_ON(sizeof(struct batadv_tvlv_tt_change) != 12); | |
520 | BUILD_BUG_ON(sizeof(struct batadv_tvlv_roam_adv) != 8); | |
80067c83 | 521 | |
a1f1ac5c SW |
522 | /* broadcast packet */ |
523 | batadv_rx_handler[BATADV_BCAST] = batadv_recv_bcast_packet; | |
524 | ||
525 | /* unicast packets ... */ | |
7cdcf6dd AQ |
526 | /* unicast with 4 addresses packet */ |
527 | batadv_rx_handler[BATADV_UNICAST_4ADDR] = batadv_recv_unicast_packet; | |
ffa995e0 | 528 | /* unicast packet */ |
acd34afa | 529 | batadv_rx_handler[BATADV_UNICAST] = batadv_recv_unicast_packet; |
ef261577 ML |
530 | /* unicast tvlv packet */ |
531 | batadv_rx_handler[BATADV_UNICAST_TVLV] = batadv_recv_unicast_tvlv; | |
a1f1ac5c SW |
532 | /* batman icmp packet */ |
533 | batadv_rx_handler[BATADV_ICMP] = batadv_recv_icmp_packet; | |
610bfc6b MH |
534 | /* Fragmented packets */ |
535 | batadv_rx_handler[BATADV_UNICAST_FRAG] = batadv_recv_frag_packet; | |
ffa995e0 ML |
536 | } |
537 | ||
56303d34 | 538 | int |
6b5e971a | 539 | batadv_recv_handler_register(u8 packet_type, |
56303d34 SE |
540 | int (*recv_handler)(struct sk_buff *, |
541 | struct batadv_hard_iface *)) | |
ffa995e0 | 542 | { |
a1f1ac5c SW |
543 | int (*curr)(struct sk_buff *, |
544 | struct batadv_hard_iface *); | |
545 | curr = batadv_rx_handler[packet_type]; | |
546 | ||
547 | if ((curr != batadv_recv_unhandled_packet) && | |
548 | (curr != batadv_recv_unhandled_unicast_packet)) | |
ffa995e0 ML |
549 | return -EBUSY; |
550 | ||
ee11ad61 | 551 | batadv_rx_handler[packet_type] = recv_handler; |
ffa995e0 ML |
552 | return 0; |
553 | } | |
554 | ||
6b5e971a | 555 | void batadv_recv_handler_unregister(u8 packet_type) |
ffa995e0 | 556 | { |
ee11ad61 | 557 | batadv_rx_handler[packet_type] = batadv_recv_unhandled_packet; |
ffa995e0 ML |
558 | } |
559 | ||
95a066d8 SE |
560 | /** |
561 | * batadv_skb_crc32 - calculate CRC32 of the whole packet and skip bytes in | |
562 | * the header | |
563 | * @skb: skb pointing to fragmented socket buffers | |
564 | * @payload_ptr: Pointer to position inside the head buffer of the skb | |
565 | * marking the start of the data to be CRC'ed | |
566 | * | |
567 | * payload_ptr must always point to an address in the skb head buffer and not to | |
568 | * a fragment. | |
7afcbbef SE |
569 | * |
570 | * Return: big endian crc32c of the checksummed data | |
95a066d8 SE |
571 | */ |
572 | __be32 batadv_skb_crc32(struct sk_buff *skb, u8 *payload_ptr) | |
573 | { | |
574 | u32 crc = 0; | |
575 | unsigned int from; | |
576 | unsigned int to = skb->len; | |
577 | struct skb_seq_state st; | |
578 | const u8 *data; | |
579 | unsigned int len; | |
580 | unsigned int consumed = 0; | |
581 | ||
582 | from = (unsigned int)(payload_ptr - skb->data); | |
583 | ||
584 | skb_prepare_seq_read(skb, from, to, &st); | |
585 | while ((len = skb_seq_read(consumed, &data, &st)) != 0) { | |
586 | crc = crc32c(crc, data, len); | |
587 | consumed += len; | |
588 | } | |
95a066d8 SE |
589 | |
590 | return htonl(crc); | |
591 | } | |
592 | ||
c018ad3d AQ |
593 | /** |
594 | * batadv_get_vid - extract the VLAN identifier from skb if any | |
595 | * @skb: the buffer containing the packet | |
596 | * @header_len: length of the batman header preceding the ethernet header | |
597 | * | |
62fe710f SE |
598 | * Return: VID with the BATADV_VLAN_HAS_TAG flag when the packet embedded in the |
599 | * skb is vlan tagged. Otherwise BATADV_NO_FLAGS. | |
c018ad3d AQ |
600 | */ |
601 | unsigned short batadv_get_vid(struct sk_buff *skb, size_t header_len) | |
602 | { | |
603 | struct ethhdr *ethhdr = (struct ethhdr *)(skb->data + header_len); | |
604 | struct vlan_ethhdr *vhdr; | |
605 | unsigned short vid; | |
606 | ||
607 | if (ethhdr->h_proto != htons(ETH_P_8021Q)) | |
608 | return BATADV_NO_FLAGS; | |
609 | ||
610 | if (!pskb_may_pull(skb, header_len + VLAN_ETH_HLEN)) | |
611 | return BATADV_NO_FLAGS; | |
612 | ||
613 | vhdr = (struct vlan_ethhdr *)(skb->data + header_len); | |
614 | vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK; | |
615 | vid |= BATADV_VLAN_HAS_TAG; | |
616 | ||
617 | return vid; | |
618 | } | |
619 | ||
eceb22ae AQ |
620 | /** |
621 | * batadv_vlan_ap_isola_get - return the AP isolation status for the given vlan | |
622 | * @bat_priv: the bat priv with all the soft interface information | |
623 | * @vid: the VLAN identifier for which the AP isolation attributed as to be | |
624 | * looked up | |
625 | * | |
62fe710f | 626 | * Return: true if AP isolation is on for the VLAN idenfied by vid, false |
eceb22ae AQ |
627 | * otherwise |
628 | */ | |
629 | bool batadv_vlan_ap_isola_get(struct batadv_priv *bat_priv, unsigned short vid) | |
630 | { | |
631 | bool ap_isolation_enabled = false; | |
632 | struct batadv_softif_vlan *vlan; | |
633 | ||
634 | /* if the AP isolation is requested on a VLAN, then check for its | |
635 | * setting in the proper VLAN private data structure | |
636 | */ | |
637 | vlan = batadv_softif_vlan_get(bat_priv, vid); | |
638 | if (vlan) { | |
639 | ap_isolation_enabled = atomic_read(&vlan->ap_isolation); | |
9c3bf081 | 640 | batadv_softif_vlan_put(vlan); |
eceb22ae AQ |
641 | } |
642 | ||
643 | return ap_isolation_enabled; | |
644 | } | |
645 | ||
ee11ad61 SE |
646 | module_init(batadv_init); |
647 | module_exit(batadv_exit); | |
c6c8fea2 SE |
648 | |
649 | MODULE_LICENSE("GPL"); | |
650 | ||
42d0b044 SE |
651 | MODULE_AUTHOR(BATADV_DRIVER_AUTHOR); |
652 | MODULE_DESCRIPTION(BATADV_DRIVER_DESC); | |
653 | MODULE_SUPPORTED_DEVICE(BATADV_DRIVER_DEVICE); | |
654 | MODULE_VERSION(BATADV_SOURCE_VERSION); | |
9791860c | 655 | MODULE_ALIAS_RTNL_LINK("batadv"); |