1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* Copyright (C) B.A.T.M.A.N. contributors: |
3 | * |
4 | * Marek Lindner, Simon Wunderlich |
5 | */ |
6 | |
7 | #include "main.h" |
8 | |
9 | #include <linux/array_size.h> |
10 | #include <linux/atomic.h> |
11 | #include <linux/build_bug.h> |
12 | #include <linux/byteorder/generic.h> |
13 | #include <linux/container_of.h> |
14 | #include <linux/crc32c.h> |
15 | #include <linux/device.h> |
16 | #include <linux/errno.h> |
17 | #include <linux/genetlink.h> |
18 | #include <linux/gfp.h> |
19 | #include <linux/if_ether.h> |
20 | #include <linux/if_vlan.h> |
21 | #include <linux/init.h> |
22 | #include <linux/ip.h> |
23 | #include <linux/ipv6.h> |
24 | #include <linux/kobject.h> |
25 | #include <linux/kref.h> |
26 | #include <linux/list.h> |
27 | #include <linux/minmax.h> |
28 | #include <linux/module.h> |
29 | #include <linux/netdevice.h> |
30 | #include <linux/printk.h> |
31 | #include <linux/rculist.h> |
32 | #include <linux/rcupdate.h> |
33 | #include <linux/skbuff.h> |
34 | #include <linux/slab.h> |
35 | #include <linux/spinlock.h> |
36 | #include <linux/sprintf.h> |
37 | #include <linux/stddef.h> |
38 | #include <linux/string.h> |
39 | #include <linux/workqueue.h> |
40 | #include <net/dsfield.h> |
41 | #include <net/rtnetlink.h> |
42 | #include <uapi/linux/batadv_packet.h> |
43 | #include <uapi/linux/batman_adv.h> |
44 | |
45 | #include "bat_algo.h" |
46 | #include "bat_iv_ogm.h" |
47 | #include "bat_v.h" |
48 | #include "bridge_loop_avoidance.h" |
49 | #include "distributed-arp-table.h" |
50 | #include "gateway_client.h" |
51 | #include "gateway_common.h" |
52 | #include "hard-interface.h" |
53 | #include "log.h" |
54 | #include "multicast.h" |
55 | #include "netlink.h" |
56 | #include "network-coding.h" |
57 | #include "originator.h" |
58 | #include "routing.h" |
59 | #include "send.h" |
60 | #include "soft-interface.h" |
61 | #include "tp_meter.h" |
62 | #include "translation-table.h" |
63 | |
64 | /* List manipulations on hardif_list have to be rtnl_lock()'ed, |
65 | * list traversals just rcu-locked |
66 | */ |
67 | struct list_head batadv_hardif_list; |
68 | unsigned int batadv_hardif_generation; |
69 | static int (*batadv_rx_handler[256])(struct sk_buff *skb, |
70 | struct batadv_hard_iface *recv_if); |
71 | |
72 | unsigned char batadv_broadcast_addr[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; |
73 | |
74 | struct workqueue_struct *batadv_event_workqueue; |
75 | |
76 | static void batadv_recv_handler_init(void); |
77 | |
78 | #define BATADV_UEV_TYPE_VAR "BATTYPE=" |
79 | #define BATADV_UEV_ACTION_VAR "BATACTION=" |
80 | #define BATADV_UEV_DATA_VAR "BATDATA=" |
81 | |
82 | static char *batadv_uev_action_str[] = { |
83 | "add" , |
84 | "del" , |
85 | "change" , |
86 | "loopdetect" , |
87 | }; |
88 | |
89 | static char *batadv_uev_type_str[] = { |
90 | "gw" , |
91 | "bla" , |
92 | }; |
93 | |
94 | static int __init batadv_init(void) |
95 | { |
96 | int ret; |
97 | |
98 | ret = batadv_tt_cache_init(); |
99 | if (ret < 0) |
100 | return ret; |
101 | |
102 | INIT_LIST_HEAD(list: &batadv_hardif_list); |
103 | batadv_algo_init(); |
104 | |
105 | batadv_recv_handler_init(); |
106 | |
107 | batadv_v_init(); |
108 | batadv_iv_init(); |
109 | batadv_nc_init(); |
110 | batadv_tp_meter_init(); |
111 | |
112 | batadv_event_workqueue = create_singlethread_workqueue("bat_events" ); |
113 | if (!batadv_event_workqueue) |
114 | goto err_create_wq; |
115 | |
116 | register_netdevice_notifier(nb: &batadv_hard_if_notifier); |
117 | rtnl_link_register(ops: &batadv_link_ops); |
118 | batadv_netlink_register(); |
119 | |
120 | pr_info("B.A.T.M.A.N. advanced %s (compatibility version %i) loaded\n" , |
121 | BATADV_SOURCE_VERSION, BATADV_COMPAT_VERSION); |
122 | |
123 | return 0; |
124 | |
125 | err_create_wq: |
126 | batadv_tt_cache_destroy(); |
127 | |
128 | return -ENOMEM; |
129 | } |
130 | |
131 | static void __exit batadv_exit(void) |
132 | { |
133 | batadv_netlink_unregister(); |
134 | rtnl_link_unregister(ops: &batadv_link_ops); |
135 | unregister_netdevice_notifier(nb: &batadv_hard_if_notifier); |
136 | |
137 | destroy_workqueue(wq: batadv_event_workqueue); |
138 | batadv_event_workqueue = NULL; |
139 | |
140 | rcu_barrier(); |
141 | |
142 | batadv_tt_cache_destroy(); |
143 | } |
144 | |
145 | /** |
146 | * batadv_mesh_init() - Initialize soft interface |
147 | * @soft_iface: netdev struct of the soft interface |
148 | * |
149 | * Return: 0 on success or negative error number in case of failure |
150 | */ |
151 | int batadv_mesh_init(struct net_device *soft_iface) |
152 | { |
153 | struct batadv_priv *bat_priv = netdev_priv(dev: soft_iface); |
154 | int ret; |
155 | |
156 | spin_lock_init(&bat_priv->forw_bat_list_lock); |
157 | spin_lock_init(&bat_priv->forw_bcast_list_lock); |
158 | spin_lock_init(&bat_priv->tt.changes_list_lock); |
159 | spin_lock_init(&bat_priv->tt.req_list_lock); |
160 | spin_lock_init(&bat_priv->tt.roam_list_lock); |
161 | spin_lock_init(&bat_priv->tt.last_changeset_lock); |
162 | spin_lock_init(&bat_priv->tt.commit_lock); |
163 | spin_lock_init(&bat_priv->gw.list_lock); |
164 | #ifdef CONFIG_BATMAN_ADV_MCAST |
165 | spin_lock_init(&bat_priv->mcast.mla_lock); |
166 | spin_lock_init(&bat_priv->mcast.want_lists_lock); |
167 | #endif |
168 | spin_lock_init(&bat_priv->tvlv.container_list_lock); |
169 | spin_lock_init(&bat_priv->tvlv.handler_list_lock); |
170 | spin_lock_init(&bat_priv->softif_vlan_list_lock); |
171 | spin_lock_init(&bat_priv->tp_list_lock); |
172 | |
173 | INIT_HLIST_HEAD(&bat_priv->forw_bat_list); |
174 | INIT_HLIST_HEAD(&bat_priv->forw_bcast_list); |
175 | INIT_HLIST_HEAD(&bat_priv->gw.gateway_list); |
176 | #ifdef CONFIG_BATMAN_ADV_MCAST |
177 | INIT_HLIST_HEAD(&bat_priv->mcast.want_all_unsnoopables_list); |
178 | INIT_HLIST_HEAD(&bat_priv->mcast.want_all_ipv4_list); |
179 | INIT_HLIST_HEAD(&bat_priv->mcast.want_all_ipv6_list); |
180 | #endif |
181 | INIT_LIST_HEAD(list: &bat_priv->tt.changes_list); |
182 | INIT_HLIST_HEAD(&bat_priv->tt.req_list); |
183 | INIT_LIST_HEAD(list: &bat_priv->tt.roam_list); |
184 | #ifdef CONFIG_BATMAN_ADV_MCAST |
185 | INIT_HLIST_HEAD(&bat_priv->mcast.mla_list); |
186 | #endif |
187 | INIT_HLIST_HEAD(&bat_priv->tvlv.container_list); |
188 | INIT_HLIST_HEAD(&bat_priv->tvlv.handler_list); |
189 | INIT_HLIST_HEAD(&bat_priv->softif_vlan_list); |
190 | INIT_HLIST_HEAD(&bat_priv->tp_list); |
191 | |
192 | bat_priv->gw.generation = 0; |
193 | |
194 | ret = batadv_originator_init(bat_priv); |
195 | if (ret < 0) { |
196 | atomic_set(v: &bat_priv->mesh_state, i: BATADV_MESH_DEACTIVATING); |
197 | goto err_orig; |
198 | } |
199 | |
200 | ret = batadv_tt_init(bat_priv); |
201 | if (ret < 0) { |
202 | atomic_set(v: &bat_priv->mesh_state, i: BATADV_MESH_DEACTIVATING); |
203 | goto err_tt; |
204 | } |
205 | |
206 | ret = batadv_v_mesh_init(bat_priv); |
207 | if (ret < 0) { |
208 | atomic_set(v: &bat_priv->mesh_state, i: BATADV_MESH_DEACTIVATING); |
209 | goto err_v; |
210 | } |
211 | |
212 | ret = batadv_bla_init(bat_priv); |
213 | if (ret < 0) { |
214 | atomic_set(v: &bat_priv->mesh_state, i: BATADV_MESH_DEACTIVATING); |
215 | goto err_bla; |
216 | } |
217 | |
218 | ret = batadv_dat_init(bat_priv); |
219 | if (ret < 0) { |
220 | atomic_set(v: &bat_priv->mesh_state, i: BATADV_MESH_DEACTIVATING); |
221 | goto err_dat; |
222 | } |
223 | |
224 | ret = batadv_nc_mesh_init(bat_priv); |
225 | if (ret < 0) { |
226 | atomic_set(v: &bat_priv->mesh_state, i: BATADV_MESH_DEACTIVATING); |
227 | goto err_nc; |
228 | } |
229 | |
230 | batadv_gw_init(bat_priv); |
231 | batadv_mcast_init(bat_priv); |
232 | |
233 | atomic_set(v: &bat_priv->gw.reselect, i: 0); |
234 | atomic_set(v: &bat_priv->mesh_state, i: BATADV_MESH_ACTIVE); |
235 | |
236 | return 0; |
237 | |
238 | err_nc: |
239 | batadv_dat_free(bat_priv); |
240 | err_dat: |
241 | batadv_bla_free(bat_priv); |
242 | err_bla: |
243 | batadv_v_mesh_free(bat_priv); |
244 | err_v: |
245 | batadv_tt_free(bat_priv); |
246 | err_tt: |
247 | batadv_originator_free(bat_priv); |
248 | err_orig: |
249 | batadv_purge_outstanding_packets(bat_priv, NULL); |
250 | atomic_set(v: &bat_priv->mesh_state, i: BATADV_MESH_INACTIVE); |
251 | |
252 | return ret; |
253 | } |
254 | |
255 | /** |
256 | * batadv_mesh_free() - Deinitialize soft interface |
257 | * @soft_iface: netdev struct of the soft interface |
258 | */ |
259 | void batadv_mesh_free(struct net_device *soft_iface) |
260 | { |
261 | struct batadv_priv *bat_priv = netdev_priv(dev: soft_iface); |
262 | |
263 | atomic_set(v: &bat_priv->mesh_state, i: BATADV_MESH_DEACTIVATING); |
264 | |
265 | batadv_purge_outstanding_packets(bat_priv, NULL); |
266 | |
267 | batadv_gw_node_free(bat_priv); |
268 | |
269 | batadv_v_mesh_free(bat_priv); |
270 | batadv_nc_mesh_free(bat_priv); |
271 | batadv_dat_free(bat_priv); |
272 | batadv_bla_free(bat_priv); |
273 | |
274 | batadv_mcast_free(bat_priv); |
275 | |
276 | /* Free the TT and the originator tables only after having terminated |
277 | * all the other depending components which may use these structures for |
278 | * their purposes. |
279 | */ |
280 | batadv_tt_free(bat_priv); |
281 | |
282 | /* Since the originator table clean up routine is accessing the TT |
283 | * tables as well, it has to be invoked after the TT tables have been |
284 | * freed and marked as empty. This ensures that no cleanup RCU callbacks |
285 | * accessing the TT data are scheduled for later execution. |
286 | */ |
287 | batadv_originator_free(bat_priv); |
288 | |
289 | batadv_gw_free(bat_priv); |
290 | |
291 | free_percpu(pdata: bat_priv->bat_counters); |
292 | bat_priv->bat_counters = NULL; |
293 | |
294 | atomic_set(v: &bat_priv->mesh_state, i: BATADV_MESH_INACTIVE); |
295 | } |
296 | |
297 | /** |
298 | * batadv_is_my_mac() - check if the given mac address belongs to any of the |
299 | * real interfaces in the current mesh |
300 | * @bat_priv: the bat priv with all the soft interface information |
301 | * @addr: the address to check |
302 | * |
303 | * Return: 'true' if the mac address was found, false otherwise. |
304 | */ |
305 | bool batadv_is_my_mac(struct batadv_priv *bat_priv, const u8 *addr) |
306 | { |
307 | const struct batadv_hard_iface *hard_iface; |
308 | bool is_my_mac = false; |
309 | |
310 | rcu_read_lock(); |
311 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
312 | if (hard_iface->if_status != BATADV_IF_ACTIVE) |
313 | continue; |
314 | |
315 | if (hard_iface->soft_iface != bat_priv->soft_iface) |
316 | continue; |
317 | |
318 | if (batadv_compare_eth(data1: hard_iface->net_dev->dev_addr, data2: addr)) { |
319 | is_my_mac = true; |
320 | break; |
321 | } |
322 | } |
323 | rcu_read_unlock(); |
324 | return is_my_mac; |
325 | } |
326 | |
327 | /** |
328 | * batadv_max_header_len() - calculate maximum encapsulation overhead for a |
329 | * payload packet |
330 | * |
331 | * Return: the maximum encapsulation overhead in bytes. |
332 | */ |
333 | int (void) |
334 | { |
335 | int = 0; |
336 | |
337 | header_len = max_t(int, header_len, |
338 | sizeof(struct batadv_unicast_packet)); |
339 | header_len = max_t(int, header_len, |
340 | sizeof(struct batadv_unicast_4addr_packet)); |
341 | header_len = max_t(int, header_len, |
342 | sizeof(struct batadv_bcast_packet)); |
343 | |
344 | #ifdef CONFIG_BATMAN_ADV_NC |
345 | header_len = max_t(int, header_len, |
346 | sizeof(struct batadv_coded_packet)); |
347 | #endif |
348 | |
349 | return header_len + ETH_HLEN; |
350 | } |
351 | |
352 | /** |
353 | * batadv_skb_set_priority() - sets skb priority according to packet content |
354 | * @skb: the packet to be sent |
355 | * @offset: offset to the packet content |
356 | * |
357 | * This function sets a value between 256 and 263 (802.1d priority), which |
358 | * can be interpreted by the cfg80211 or other drivers. |
359 | */ |
360 | void batadv_skb_set_priority(struct sk_buff *skb, int offset) |
361 | { |
362 | struct iphdr ip_hdr_tmp, *ip_hdr; |
363 | struct ipv6hdr ip6_hdr_tmp, *ip6_hdr; |
364 | struct ethhdr ethhdr_tmp, *ethhdr; |
365 | struct vlan_ethhdr *vhdr, vhdr_tmp; |
366 | u32 prio; |
367 | |
368 | /* already set, do nothing */ |
369 | if (skb->priority >= 256 && skb->priority <= 263) |
370 | return; |
371 | |
372 | ethhdr = skb_header_pointer(skb, offset, len: sizeof(*ethhdr), buffer: ðhdr_tmp); |
373 | if (!ethhdr) |
374 | return; |
375 | |
376 | switch (ethhdr->h_proto) { |
377 | case htons(ETH_P_8021Q): |
378 | vhdr = skb_header_pointer(skb, offset: offset + sizeof(*vhdr), |
379 | len: sizeof(*vhdr), buffer: &vhdr_tmp); |
380 | if (!vhdr) |
381 | return; |
382 | prio = ntohs(vhdr->h_vlan_TCI) & VLAN_PRIO_MASK; |
383 | prio = prio >> VLAN_PRIO_SHIFT; |
384 | break; |
385 | case htons(ETH_P_IP): |
386 | ip_hdr = skb_header_pointer(skb, offset: offset + sizeof(*ethhdr), |
387 | len: sizeof(*ip_hdr), buffer: &ip_hdr_tmp); |
388 | if (!ip_hdr) |
389 | return; |
390 | prio = (ipv4_get_dsfield(iph: ip_hdr) & 0xfc) >> 5; |
391 | break; |
392 | case htons(ETH_P_IPV6): |
393 | ip6_hdr = skb_header_pointer(skb, offset: offset + sizeof(*ethhdr), |
394 | len: sizeof(*ip6_hdr), buffer: &ip6_hdr_tmp); |
395 | if (!ip6_hdr) |
396 | return; |
397 | prio = (ipv6_get_dsfield(ipv6h: ip6_hdr) & 0xfc) >> 5; |
398 | break; |
399 | default: |
400 | return; |
401 | } |
402 | |
403 | skb->priority = prio + 256; |
404 | } |
405 | |
406 | static int batadv_recv_unhandled_packet(struct sk_buff *skb, |
407 | struct batadv_hard_iface *recv_if) |
408 | { |
409 | kfree_skb(skb); |
410 | |
411 | return NET_RX_DROP; |
412 | } |
413 | |
414 | /* incoming packets with the batman ethertype received on any active hard |
415 | * interface |
416 | */ |
417 | |
418 | /** |
419 | * batadv_batman_skb_recv() - Handle incoming message from an hard interface |
420 | * @skb: the received packet |
421 | * @dev: the net device that the packet was received on |
422 | * @ptype: packet type of incoming packet (ETH_P_BATMAN) |
423 | * @orig_dev: the original receive net device (e.g. bonded device) |
424 | * |
425 | * Return: NET_RX_SUCCESS on success or NET_RX_DROP in case of failure |
426 | */ |
427 | int batadv_batman_skb_recv(struct sk_buff *skb, struct net_device *dev, |
428 | struct packet_type *ptype, |
429 | struct net_device *orig_dev) |
430 | { |
431 | struct batadv_priv *bat_priv; |
432 | struct batadv_ogm_packet *batadv_ogm_packet; |
433 | struct batadv_hard_iface *hard_iface; |
434 | u8 idx; |
435 | |
436 | hard_iface = container_of(ptype, struct batadv_hard_iface, |
437 | batman_adv_ptype); |
438 | |
439 | /* Prevent processing a packet received on an interface which is getting |
440 | * shut down otherwise the packet may trigger de-reference errors |
441 | * further down in the receive path. |
442 | */ |
443 | if (!kref_get_unless_zero(kref: &hard_iface->refcount)) |
444 | goto err_out; |
445 | |
446 | skb = skb_share_check(skb, GFP_ATOMIC); |
447 | |
448 | /* skb was released by skb_share_check() */ |
449 | if (!skb) |
450 | goto err_put; |
451 | |
452 | /* packet should hold at least type and version */ |
453 | if (unlikely(!pskb_may_pull(skb, 2))) |
454 | goto err_free; |
455 | |
456 | /* expect a valid ethernet header here. */ |
457 | if (unlikely(skb->mac_len != ETH_HLEN || !skb_mac_header(skb))) |
458 | goto err_free; |
459 | |
460 | if (!hard_iface->soft_iface) |
461 | goto err_free; |
462 | |
463 | bat_priv = netdev_priv(dev: hard_iface->soft_iface); |
464 | |
465 | if (atomic_read(v: &bat_priv->mesh_state) != BATADV_MESH_ACTIVE) |
466 | goto err_free; |
467 | |
468 | /* discard frames on not active interfaces */ |
469 | if (hard_iface->if_status != BATADV_IF_ACTIVE) |
470 | goto err_free; |
471 | |
472 | batadv_ogm_packet = (struct batadv_ogm_packet *)skb->data; |
473 | |
474 | if (batadv_ogm_packet->version != BATADV_COMPAT_VERSION) { |
475 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
476 | "Drop packet: incompatible batman version (%i)\n" , |
477 | batadv_ogm_packet->version); |
478 | goto err_free; |
479 | } |
480 | |
481 | /* reset control block to avoid left overs from previous users */ |
482 | memset(skb->cb, 0, sizeof(struct batadv_skb_cb)); |
483 | |
484 | idx = batadv_ogm_packet->packet_type; |
485 | (*batadv_rx_handler[idx])(skb, hard_iface); |
486 | |
487 | batadv_hardif_put(hard_iface); |
488 | |
489 | /* return NET_RX_SUCCESS in any case as we |
490 | * most probably dropped the packet for |
491 | * routing-logical reasons. |
492 | */ |
493 | return NET_RX_SUCCESS; |
494 | |
495 | err_free: |
496 | kfree_skb(skb); |
497 | err_put: |
498 | batadv_hardif_put(hard_iface); |
499 | err_out: |
500 | return NET_RX_DROP; |
501 | } |
502 | |
503 | static void batadv_recv_handler_init(void) |
504 | { |
505 | int i; |
506 | |
507 | for (i = 0; i < ARRAY_SIZE(batadv_rx_handler); i++) |
508 | batadv_rx_handler[i] = batadv_recv_unhandled_packet; |
509 | |
510 | for (i = BATADV_UNICAST_MIN; i <= BATADV_UNICAST_MAX; i++) |
511 | batadv_rx_handler[i] = batadv_recv_unhandled_unicast_packet; |
512 | |
513 | /* compile time checks for sizes */ |
514 | BUILD_BUG_ON(sizeof(struct batadv_bla_claim_dst) != 6); |
515 | BUILD_BUG_ON(sizeof(struct batadv_ogm_packet) != 24); |
516 | BUILD_BUG_ON(sizeof(struct batadv_icmp_header) != 20); |
517 | BUILD_BUG_ON(sizeof(struct batadv_icmp_packet) != 20); |
518 | BUILD_BUG_ON(sizeof(struct batadv_icmp_packet_rr) != 116); |
519 | BUILD_BUG_ON(sizeof(struct batadv_unicast_packet) != 10); |
520 | BUILD_BUG_ON(sizeof(struct batadv_unicast_4addr_packet) != 18); |
521 | BUILD_BUG_ON(sizeof(struct batadv_frag_packet) != 20); |
522 | BUILD_BUG_ON(sizeof(struct batadv_bcast_packet) != 14); |
523 | BUILD_BUG_ON(sizeof(struct batadv_coded_packet) != 46); |
524 | BUILD_BUG_ON(sizeof(struct batadv_unicast_tvlv_packet) != 20); |
525 | BUILD_BUG_ON(sizeof(struct batadv_tvlv_hdr) != 4); |
526 | BUILD_BUG_ON(sizeof(struct batadv_tvlv_gateway_data) != 8); |
527 | BUILD_BUG_ON(sizeof(struct batadv_tvlv_tt_vlan_data) != 8); |
528 | BUILD_BUG_ON(sizeof(struct batadv_tvlv_tt_change) != 12); |
529 | BUILD_BUG_ON(sizeof(struct batadv_tvlv_roam_adv) != 8); |
530 | |
531 | i = sizeof_field(struct sk_buff, cb); |
532 | BUILD_BUG_ON(sizeof(struct batadv_skb_cb) > i); |
533 | |
534 | /* broadcast packet */ |
535 | batadv_rx_handler[BATADV_BCAST] = batadv_recv_bcast_packet; |
536 | /* multicast packet */ |
537 | batadv_rx_handler[BATADV_MCAST] = batadv_recv_mcast_packet; |
538 | |
539 | /* unicast packets ... */ |
540 | /* unicast with 4 addresses packet */ |
541 | batadv_rx_handler[BATADV_UNICAST_4ADDR] = batadv_recv_unicast_packet; |
542 | /* unicast packet */ |
543 | batadv_rx_handler[BATADV_UNICAST] = batadv_recv_unicast_packet; |
544 | /* unicast tvlv packet */ |
545 | batadv_rx_handler[BATADV_UNICAST_TVLV] = batadv_recv_unicast_tvlv; |
546 | /* batman icmp packet */ |
547 | batadv_rx_handler[BATADV_ICMP] = batadv_recv_icmp_packet; |
548 | /* Fragmented packets */ |
549 | batadv_rx_handler[BATADV_UNICAST_FRAG] = batadv_recv_frag_packet; |
550 | } |
551 | |
552 | /** |
553 | * batadv_recv_handler_register() - Register handler for batman-adv packet type |
554 | * @packet_type: batadv_packettype which should be handled |
555 | * @recv_handler: receive handler for the packet type |
556 | * |
557 | * Return: 0 on success or negative error number in case of failure |
558 | */ |
559 | int |
560 | batadv_recv_handler_register(u8 packet_type, |
561 | int (*recv_handler)(struct sk_buff *, |
562 | struct batadv_hard_iface *)) |
563 | { |
564 | int (*curr)(struct sk_buff *skb, |
565 | struct batadv_hard_iface *recv_if); |
566 | curr = batadv_rx_handler[packet_type]; |
567 | |
568 | if (curr != batadv_recv_unhandled_packet && |
569 | curr != batadv_recv_unhandled_unicast_packet) |
570 | return -EBUSY; |
571 | |
572 | batadv_rx_handler[packet_type] = recv_handler; |
573 | return 0; |
574 | } |
575 | |
576 | /** |
577 | * batadv_recv_handler_unregister() - Unregister handler for packet type |
578 | * @packet_type: batadv_packettype which should no longer be handled |
579 | */ |
580 | void batadv_recv_handler_unregister(u8 packet_type) |
581 | { |
582 | batadv_rx_handler[packet_type] = batadv_recv_unhandled_packet; |
583 | } |
584 | |
585 | /** |
586 | * batadv_skb_crc32() - calculate CRC32 of the whole packet and skip bytes in |
587 | * the header |
588 | * @skb: skb pointing to fragmented socket buffers |
589 | * @payload_ptr: Pointer to position inside the head buffer of the skb |
590 | * marking the start of the data to be CRC'ed |
591 | * |
592 | * payload_ptr must always point to an address in the skb head buffer and not to |
593 | * a fragment. |
594 | * |
595 | * Return: big endian crc32c of the checksummed data |
596 | */ |
597 | __be32 batadv_skb_crc32(struct sk_buff *skb, u8 *payload_ptr) |
598 | { |
599 | u32 crc = 0; |
600 | unsigned int from; |
601 | unsigned int to = skb->len; |
602 | struct skb_seq_state st; |
603 | const u8 *data; |
604 | unsigned int len; |
605 | unsigned int consumed = 0; |
606 | |
607 | from = (unsigned int)(payload_ptr - skb->data); |
608 | |
609 | skb_prepare_seq_read(skb, from, to, st: &st); |
610 | while ((len = skb_seq_read(consumed, data: &data, st: &st)) != 0) { |
611 | crc = crc32c(crc, address: data, length: len); |
612 | consumed += len; |
613 | } |
614 | |
615 | return htonl(crc); |
616 | } |
617 | |
618 | /** |
619 | * batadv_get_vid() - extract the VLAN identifier from skb if any |
620 | * @skb: the buffer containing the packet |
621 | * @header_len: length of the batman header preceding the ethernet header |
622 | * |
623 | * Return: VID with the BATADV_VLAN_HAS_TAG flag when the packet embedded in the |
624 | * skb is vlan tagged. Otherwise BATADV_NO_FLAGS. |
625 | */ |
626 | unsigned short batadv_get_vid(struct sk_buff *skb, size_t ) |
627 | { |
628 | struct ethhdr *ethhdr = (struct ethhdr *)(skb->data + header_len); |
629 | struct vlan_ethhdr *vhdr; |
630 | unsigned short vid; |
631 | |
632 | if (ethhdr->h_proto != htons(ETH_P_8021Q)) |
633 | return BATADV_NO_FLAGS; |
634 | |
635 | if (!pskb_may_pull(skb, len: header_len + VLAN_ETH_HLEN)) |
636 | return BATADV_NO_FLAGS; |
637 | |
638 | vhdr = (struct vlan_ethhdr *)(skb->data + header_len); |
639 | vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK; |
640 | vid |= BATADV_VLAN_HAS_TAG; |
641 | |
642 | return vid; |
643 | } |
644 | |
645 | /** |
646 | * batadv_vlan_ap_isola_get() - return AP isolation status for the given vlan |
647 | * @bat_priv: the bat priv with all the soft interface information |
648 | * @vid: the VLAN identifier for which the AP isolation attributed as to be |
649 | * looked up |
650 | * |
651 | * Return: true if AP isolation is on for the VLAN identified by vid, false |
652 | * otherwise |
653 | */ |
654 | bool batadv_vlan_ap_isola_get(struct batadv_priv *bat_priv, unsigned short vid) |
655 | { |
656 | bool ap_isolation_enabled = false; |
657 | struct batadv_softif_vlan *vlan; |
658 | |
659 | /* if the AP isolation is requested on a VLAN, then check for its |
660 | * setting in the proper VLAN private data structure |
661 | */ |
662 | vlan = batadv_softif_vlan_get(bat_priv, vid); |
663 | if (vlan) { |
664 | ap_isolation_enabled = atomic_read(v: &vlan->ap_isolation); |
665 | batadv_softif_vlan_put(vlan); |
666 | } |
667 | |
668 | return ap_isolation_enabled; |
669 | } |
670 | |
671 | /** |
672 | * batadv_throw_uevent() - Send an uevent with batman-adv specific env data |
673 | * @bat_priv: the bat priv with all the soft interface information |
674 | * @type: subsystem type of event. Stored in uevent's BATTYPE |
675 | * @action: action type of event. Stored in uevent's BATACTION |
676 | * @data: string with additional information to the event (ignored for |
677 | * BATADV_UEV_DEL). Stored in uevent's BATDATA |
678 | * |
679 | * Return: 0 on success or negative error number in case of failure |
680 | */ |
681 | int batadv_throw_uevent(struct batadv_priv *bat_priv, enum batadv_uev_type type, |
682 | enum batadv_uev_action action, const char *data) |
683 | { |
684 | int ret = -ENOMEM; |
685 | struct kobject *bat_kobj; |
686 | char *uevent_env[4] = { NULL, NULL, NULL, NULL }; |
687 | |
688 | bat_kobj = &bat_priv->soft_iface->dev.kobj; |
689 | |
690 | uevent_env[0] = kasprintf(GFP_ATOMIC, |
691 | fmt: "%s%s" , BATADV_UEV_TYPE_VAR, |
692 | batadv_uev_type_str[type]); |
693 | if (!uevent_env[0]) |
694 | goto report_error; |
695 | |
696 | uevent_env[1] = kasprintf(GFP_ATOMIC, |
697 | fmt: "%s%s" , BATADV_UEV_ACTION_VAR, |
698 | batadv_uev_action_str[action]); |
699 | if (!uevent_env[1]) |
700 | goto free_first_env; |
701 | |
702 | /* If the event is DEL, ignore the data field */ |
703 | if (action != BATADV_UEV_DEL) { |
704 | uevent_env[2] = kasprintf(GFP_ATOMIC, |
705 | fmt: "%s%s" , BATADV_UEV_DATA_VAR, data); |
706 | if (!uevent_env[2]) |
707 | goto free_second_env; |
708 | } |
709 | |
710 | ret = kobject_uevent_env(kobj: bat_kobj, action: KOBJ_CHANGE, envp: uevent_env); |
711 | kfree(objp: uevent_env[2]); |
712 | free_second_env: |
713 | kfree(objp: uevent_env[1]); |
714 | free_first_env: |
715 | kfree(objp: uevent_env[0]); |
716 | |
717 | if (ret) |
718 | report_error: |
719 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
720 | "Impossible to send uevent for (%s,%s,%s) event (err: %d)\n" , |
721 | batadv_uev_type_str[type], |
722 | batadv_uev_action_str[action], |
723 | (action == BATADV_UEV_DEL ? "NULL" : data), ret); |
724 | return ret; |
725 | } |
726 | |
727 | module_init(batadv_init); |
728 | module_exit(batadv_exit); |
729 | |
730 | MODULE_LICENSE("GPL" ); |
731 | |
732 | MODULE_AUTHOR(BATADV_DRIVER_AUTHOR); |
733 | MODULE_DESCRIPTION(BATADV_DRIVER_DESC); |
734 | MODULE_VERSION(BATADV_SOURCE_VERSION); |
735 | MODULE_ALIAS_RTNL_LINK("batadv" ); |
736 | MODULE_ALIAS_GENL_FAMILY(BATADV_NL_NAME); |
737 | |