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