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7db7d9f3 | 1 | // SPDX-License-Identifier: GPL-2.0 |
cfa55c6d | 2 | /* Copyright (C) B.A.T.M.A.N. contributors: |
c6c8fea2 SE |
3 | * |
4 | * Marek Lindner, Simon Wunderlich | |
c6c8fea2 SE |
5 | */ |
6 | ||
1e2c2a4f SE |
7 | #include "main.h" |
8 | ||
9 | #include <linux/atomic.h> | |
ecc36f5e | 10 | #include <linux/build_bug.h> |
1e2c2a4f | 11 | #include <linux/byteorder/generic.h> |
eb7da4f1 | 12 | #include <linux/container_of.h> |
95a066d8 | 13 | #include <linux/crc32c.h> |
0fa4c30d | 14 | #include <linux/device.h> |
1e2c2a4f | 15 | #include <linux/errno.h> |
2c0c06ff | 16 | #include <linux/genetlink.h> |
b92b94ac | 17 | #include <linux/gfp.h> |
1e2c2a4f | 18 | #include <linux/if_ether.h> |
c54f38c9 | 19 | #include <linux/if_vlan.h> |
1e2c2a4f SE |
20 | #include <linux/init.h> |
21 | #include <linux/ip.h> | |
22 | #include <linux/ipv6.h> | |
23 | #include <linux/kernel.h> | |
0fa4c30d | 24 | #include <linux/kobject.h> |
f7157dd1 | 25 | #include <linux/kref.h> |
1e2c2a4f | 26 | #include <linux/list.h> |
fcd193e1 | 27 | #include <linux/minmax.h> |
1e2c2a4f | 28 | #include <linux/module.h> |
1e2c2a4f | 29 | #include <linux/netdevice.h> |
ba412080 | 30 | #include <linux/printk.h> |
1e2c2a4f SE |
31 | #include <linux/rculist.h> |
32 | #include <linux/rcupdate.h> | |
1e2c2a4f | 33 | #include <linux/skbuff.h> |
0fa4c30d | 34 | #include <linux/slab.h> |
1e2c2a4f SE |
35 | #include <linux/spinlock.h> |
36 | #include <linux/stddef.h> | |
37 | #include <linux/string.h> | |
38 | #include <linux/workqueue.h> | |
c54f38c9 | 39 | #include <net/dsfield.h> |
1e2c2a4f | 40 | #include <net/rtnetlink.h> |
fec149f5 | 41 | #include <uapi/linux/batadv_packet.h> |
2c0c06ff | 42 | #include <uapi/linux/batman_adv.h> |
1e2c2a4f SE |
43 | |
44 | #include "bat_algo.h" | |
a2d08166 SE |
45 | #include "bat_iv_ogm.h" |
46 | #include "bat_v.h" | |
1e2c2a4f | 47 | #include "bridge_loop_avoidance.h" |
1e2c2a4f SE |
48 | #include "distributed-arp-table.h" |
49 | #include "gateway_client.h" | |
50 | #include "gateway_common.h" | |
51 | #include "hard-interface.h" | |
ba412080 | 52 | #include "log.h" |
1e2c2a4f | 53 | #include "multicast.h" |
09748a22 | 54 | #include "netlink.h" |
1e2c2a4f SE |
55 | #include "network-coding.h" |
56 | #include "originator.h" | |
c6c8fea2 SE |
57 | #include "routing.h" |
58 | #include "send.h" | |
c6c8fea2 | 59 | #include "soft-interface.h" |
33a3bb4a | 60 | #include "tp_meter.h" |
c6c8fea2 | 61 | #include "translation-table.h" |
c6c8fea2 | 62 | |
c3caf519 | 63 | /* List manipulations on hardif_list have to be rtnl_lock()'ed, |
9cfc7bd6 SE |
64 | * list traversals just rcu-locked |
65 | */ | |
3193e8fd | 66 | struct list_head batadv_hardif_list; |
fb69be69 | 67 | unsigned int batadv_hardif_generation; |
706cc9f5 SE |
68 | static int (*batadv_rx_handler[256])(struct sk_buff *skb, |
69 | struct batadv_hard_iface *recv_if); | |
c6c8fea2 | 70 | |
3193e8fd | 71 | unsigned char batadv_broadcast_addr[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; |
c6c8fea2 | 72 | |
3193e8fd | 73 | struct workqueue_struct *batadv_event_workqueue; |
c6c8fea2 | 74 | |
ee11ad61 | 75 | static void batadv_recv_handler_init(void); |
ffa995e0 | 76 | |
0fa4c30d SE |
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 | ||
ee11ad61 | 93 | static int __init batadv_init(void) |
c6c8fea2 | 94 | { |
86452f81 SE |
95 | int ret; |
96 | ||
97 | ret = batadv_tt_cache_init(); | |
98 | if (ret < 0) | |
99 | return ret; | |
100 | ||
3193e8fd | 101 | INIT_LIST_HEAD(&batadv_hardif_list); |
01d350d1 | 102 | batadv_algo_init(); |
1c280471 | 103 | |
ee11ad61 | 104 | batadv_recv_handler_init(); |
ffa995e0 | 105 | |
d6f94d91 | 106 | batadv_v_init(); |
81c524f7 | 107 | batadv_iv_init(); |
6c519bad | 108 | batadv_nc_init(); |
33a3bb4a | 109 | batadv_tp_meter_init(); |
c6c8fea2 | 110 | |
3193e8fd | 111 | batadv_event_workqueue = create_singlethread_workqueue("bat_events"); |
3193e8fd | 112 | if (!batadv_event_workqueue) |
86452f81 | 113 | goto err_create_wq; |
c6c8fea2 | 114 | |
9563877e | 115 | register_netdevice_notifier(&batadv_hard_if_notifier); |
a4ac28c0 | 116 | rtnl_link_register(&batadv_link_ops); |
09748a22 | 117 | batadv_netlink_register(); |
c6c8fea2 | 118 | |
86ceb360 | 119 | pr_info("B.A.T.M.A.N. advanced %s (compatibility version %i) loaded\n", |
42d0b044 | 120 | BATADV_SOURCE_VERSION, BATADV_COMPAT_VERSION); |
c6c8fea2 SE |
121 | |
122 | return 0; | |
86452f81 SE |
123 | |
124 | err_create_wq: | |
125 | batadv_tt_cache_destroy(); | |
126 | ||
127 | return -ENOMEM; | |
c6c8fea2 SE |
128 | } |
129 | ||
ee11ad61 | 130 | static void __exit batadv_exit(void) |
c6c8fea2 | 131 | { |
09748a22 | 132 | batadv_netlink_unregister(); |
a4ac28c0 | 133 | rtnl_link_unregister(&batadv_link_ops); |
9563877e | 134 | unregister_netdevice_notifier(&batadv_hard_if_notifier); |
c6c8fea2 | 135 | |
3193e8fd SE |
136 | destroy_workqueue(batadv_event_workqueue); |
137 | batadv_event_workqueue = NULL; | |
c6c8fea2 SE |
138 | |
139 | rcu_barrier(); | |
86452f81 SE |
140 | |
141 | batadv_tt_cache_destroy(); | |
c6c8fea2 SE |
142 | } |
143 | ||
ff15c27c SE |
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 | */ | |
3193e8fd | 150 | int batadv_mesh_init(struct net_device *soft_iface) |
c6c8fea2 | 151 | { |
56303d34 | 152 | struct batadv_priv *bat_priv = netdev_priv(soft_iface); |
5346c35e | 153 | int ret; |
c6c8fea2 | 154 | |
c6c8fea2 SE |
155 | spin_lock_init(&bat_priv->forw_bat_list_lock); |
156 | spin_lock_init(&bat_priv->forw_bcast_list_lock); | |
807736f6 SE |
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); | |
a70a9aa9 | 161 | spin_lock_init(&bat_priv->tt.commit_lock); |
807736f6 | 162 | spin_lock_init(&bat_priv->gw.list_lock); |
ab49886e | 163 | #ifdef CONFIG_BATMAN_ADV_MCAST |
a3c7cd0c | 164 | spin_lock_init(&bat_priv->mcast.mla_lock); |
ab49886e LL |
165 | spin_lock_init(&bat_priv->mcast.want_lists_lock); |
166 | #endif | |
ef261577 ML |
167 | spin_lock_init(&bat_priv->tvlv.container_list_lock); |
168 | spin_lock_init(&bat_priv->tvlv.handler_list_lock); | |
5d2c05b2 | 169 | spin_lock_init(&bat_priv->softif_vlan_list_lock); |
33a3bb4a | 170 | spin_lock_init(&bat_priv->tp_list_lock); |
c6c8fea2 SE |
171 | |
172 | INIT_HLIST_HEAD(&bat_priv->forw_bat_list); | |
173 | INIT_HLIST_HEAD(&bat_priv->forw_bcast_list); | |
70ea5cee | 174 | INIT_HLIST_HEAD(&bat_priv->gw.gateway_list); |
ab49886e LL |
175 | #ifdef CONFIG_BATMAN_ADV_MCAST |
176 | INIT_HLIST_HEAD(&bat_priv->mcast.want_all_unsnoopables_list); | |
4c8755d6 LL |
177 | INIT_HLIST_HEAD(&bat_priv->mcast.want_all_ipv4_list); |
178 | INIT_HLIST_HEAD(&bat_priv->mcast.want_all_ipv6_list); | |
ab49886e | 179 | #endif |
807736f6 | 180 | INIT_LIST_HEAD(&bat_priv->tt.changes_list); |
7c26a53b | 181 | INIT_HLIST_HEAD(&bat_priv->tt.req_list); |
807736f6 | 182 | INIT_LIST_HEAD(&bat_priv->tt.roam_list); |
c5caf4ef LL |
183 | #ifdef CONFIG_BATMAN_ADV_MCAST |
184 | INIT_HLIST_HEAD(&bat_priv->mcast.mla_list); | |
185 | #endif | |
ef261577 ML |
186 | INIT_HLIST_HEAD(&bat_priv->tvlv.container_list); |
187 | INIT_HLIST_HEAD(&bat_priv->tvlv.handler_list); | |
5d2c05b2 | 188 | INIT_HLIST_HEAD(&bat_priv->softif_vlan_list); |
33a3bb4a | 189 | INIT_HLIST_HEAD(&bat_priv->tp_list); |
c6c8fea2 | 190 | |
9264c85c SE |
191 | bat_priv->gw.generation = 0; |
192 | ||
7d211efc | 193 | ret = batadv_originator_init(bat_priv); |
6f68cd63 PS |
194 | if (ret < 0) { |
195 | atomic_set(&bat_priv->mesh_state, BATADV_MESH_DEACTIVATING); | |
196 | goto err_orig; | |
197 | } | |
c6c8fea2 | 198 | |
08c36d3e | 199 | ret = batadv_tt_init(bat_priv); |
6f68cd63 PS |
200 | if (ret < 0) { |
201 | atomic_set(&bat_priv->mesh_state, BATADV_MESH_DEACTIVATING); | |
202 | goto err_tt; | |
203 | } | |
204 | ||
205 | ret = batadv_v_mesh_init(bat_priv); | |
206 | if (ret < 0) { | |
207 | atomic_set(&bat_priv->mesh_state, BATADV_MESH_DEACTIVATING); | |
208 | goto err_v; | |
209 | } | |
c6c8fea2 | 210 | |
08adf151 | 211 | ret = batadv_bla_init(bat_priv); |
6f68cd63 PS |
212 | if (ret < 0) { |
213 | atomic_set(&bat_priv->mesh_state, BATADV_MESH_DEACTIVATING); | |
214 | goto err_bla; | |
215 | } | |
23721387 | 216 | |
2f1dfbe1 | 217 | ret = batadv_dat_init(bat_priv); |
6f68cd63 PS |
218 | if (ret < 0) { |
219 | atomic_set(&bat_priv->mesh_state, BATADV_MESH_DEACTIVATING); | |
220 | goto err_dat; | |
221 | } | |
2f1dfbe1 | 222 | |
6c519bad | 223 | ret = batadv_nc_mesh_init(bat_priv); |
6f68cd63 PS |
224 | if (ret < 0) { |
225 | atomic_set(&bat_priv->mesh_state, BATADV_MESH_DEACTIVATING); | |
226 | goto err_nc; | |
227 | } | |
d353d8d4 | 228 | |
414254e3 | 229 | batadv_gw_init(bat_priv); |
60432d75 | 230 | batadv_mcast_init(bat_priv); |
414254e3 | 231 | |
807736f6 | 232 | atomic_set(&bat_priv->gw.reselect, 0); |
39c75a51 | 233 | atomic_set(&bat_priv->mesh_state, BATADV_MESH_ACTIVE); |
5346c35e SE |
234 | |
235 | return 0; | |
c6c8fea2 | 236 | |
6f68cd63 PS |
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(&bat_priv->mesh_state, BATADV_MESH_INACTIVE); | |
250 | ||
5346c35e | 251 | return ret; |
c6c8fea2 SE |
252 | } |
253 | ||
ff15c27c SE |
254 | /** |
255 | * batadv_mesh_free() - Deinitialize soft interface | |
256 | * @soft_iface: netdev struct of the soft interface | |
257 | */ | |
3193e8fd | 258 | void batadv_mesh_free(struct net_device *soft_iface) |
c6c8fea2 | 259 | { |
56303d34 | 260 | struct batadv_priv *bat_priv = netdev_priv(soft_iface); |
c6c8fea2 | 261 | |
39c75a51 | 262 | atomic_set(&bat_priv->mesh_state, BATADV_MESH_DEACTIVATING); |
c6c8fea2 | 263 | |
9455e34c | 264 | batadv_purge_outstanding_packets(bat_priv, NULL); |
c6c8fea2 | 265 | |
bd3524c1 | 266 | batadv_gw_node_free(bat_priv); |
0da00359 AQ |
267 | |
268 | batadv_v_mesh_free(bat_priv); | |
6c519bad | 269 | batadv_nc_mesh_free(bat_priv); |
a4361860 AQ |
270 | batadv_dat_free(bat_priv); |
271 | batadv_bla_free(bat_priv); | |
c6c8fea2 | 272 | |
c5caf4ef LL |
273 | batadv_mcast_free(bat_priv); |
274 | ||
a4361860 AQ |
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 | */ | |
08c36d3e | 279 | batadv_tt_free(bat_priv); |
c6c8fea2 | 280 | |
a4361860 AQ |
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); | |
2f1dfbe1 | 287 | |
414254e3 ML |
288 | batadv_gw_free(bat_priv); |
289 | ||
f8214865 | 290 | free_percpu(bat_priv->bat_counters); |
f69ae770 | 291 | bat_priv->bat_counters = NULL; |
f8214865 | 292 | |
39c75a51 | 293 | atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE); |
c6c8fea2 SE |
294 | } |
295 | ||
6e0895c2 | 296 | /** |
7e9a8c2c SE |
297 | * batadv_is_my_mac() - check if the given mac address belongs to any of the |
298 | * real interfaces in the current mesh | |
6e0895c2 DM |
299 | * @bat_priv: the bat priv with all the soft interface information |
300 | * @addr: the address to check | |
e8ad3b1a | 301 | * |
62fe710f | 302 | * Return: 'true' if the mac address was found, false otherwise. |
6e0895c2 | 303 | */ |
6b5e971a | 304 | bool batadv_is_my_mac(struct batadv_priv *bat_priv, const u8 *addr) |
c6c8fea2 | 305 | { |
56303d34 | 306 | const struct batadv_hard_iface *hard_iface; |
e8ad3b1a | 307 | bool is_my_mac = false; |
c6c8fea2 SE |
308 | |
309 | rcu_read_lock(); | |
3193e8fd | 310 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e9a4f295 | 311 | if (hard_iface->if_status != BATADV_IF_ACTIVE) |
c6c8fea2 SE |
312 | continue; |
313 | ||
fe8a93b9 AQ |
314 | if (hard_iface->soft_iface != bat_priv->soft_iface) |
315 | continue; | |
316 | ||
1eda58bf | 317 | if (batadv_compare_eth(hard_iface->net_dev->dev_addr, addr)) { |
e8ad3b1a MP |
318 | is_my_mac = true; |
319 | break; | |
c6c8fea2 SE |
320 | } |
321 | } | |
322 | rcu_read_unlock(); | |
e8ad3b1a | 323 | return is_my_mac; |
c6c8fea2 SE |
324 | } |
325 | ||
411d6ed9 | 326 | /** |
7e9a8c2c | 327 | * batadv_max_header_len() - calculate maximum encapsulation overhead for a |
411d6ed9 ML |
328 | * payload packet |
329 | * | |
62fe710f | 330 | * Return: the maximum encapsulation overhead in bytes. |
411d6ed9 ML |
331 | */ |
332 | int batadv_max_header_len(void) | |
333 | { | |
334 | int header_len = 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 | ||
1df0cbd5 | 348 | return header_len + ETH_HLEN; |
411d6ed9 ML |
349 | } |
350 | ||
c54f38c9 | 351 | /** |
7e9a8c2c | 352 | * batadv_skb_set_priority() - sets skb priority according to packet content |
c54f38c9 SW |
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, sizeof(*ethhdr), 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 + sizeof(*vhdr), | |
378 | sizeof(*vhdr), &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 + sizeof(*ethhdr), | |
386 | sizeof(*ip_hdr), &ip_hdr_tmp); | |
387 | if (!ip_hdr) | |
388 | return; | |
389 | prio = (ipv4_get_dsfield(ip_hdr) & 0xfc) >> 5; | |
390 | break; | |
391 | case htons(ETH_P_IPV6): | |
392 | ip6_hdr = skb_header_pointer(skb, offset + sizeof(*ethhdr), | |
393 | sizeof(*ip6_hdr), &ip6_hdr_tmp); | |
394 | if (!ip6_hdr) | |
395 | return; | |
396 | prio = (ipv6_get_dsfield(ip6_hdr) & 0xfc) >> 5; | |
397 | break; | |
398 | default: | |
399 | return; | |
400 | } | |
401 | ||
402 | skb->priority = prio + 256; | |
403 | } | |
404 | ||
ee11ad61 | 405 | static int batadv_recv_unhandled_packet(struct sk_buff *skb, |
56303d34 | 406 | struct batadv_hard_iface *recv_if) |
ffa995e0 | 407 | { |
b91a2543 SE |
408 | kfree_skb(skb); |
409 | ||
ffa995e0 ML |
410 | return NET_RX_DROP; |
411 | } | |
412 | ||
413 | /* incoming packets with the batman ethertype received on any active hard | |
414 | * interface | |
415 | */ | |
ff15c27c SE |
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 | */ | |
3193e8fd SE |
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) | |
ffa995e0 | 429 | { |
56303d34 | 430 | struct batadv_priv *bat_priv; |
96412690 | 431 | struct batadv_ogm_packet *batadv_ogm_packet; |
56303d34 | 432 | struct batadv_hard_iface *hard_iface; |
6b5e971a | 433 | u8 idx; |
ffa995e0 | 434 | |
56303d34 SE |
435 | hard_iface = container_of(ptype, struct batadv_hard_iface, |
436 | batman_adv_ptype); | |
4fe56e60 SE |
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(&hard_iface->refcount)) | |
443 | goto err_out; | |
444 | ||
ffa995e0 ML |
445 | skb = skb_share_check(skb, GFP_ATOMIC); |
446 | ||
447 | /* skb was released by skb_share_check() */ | |
448 | if (!skb) | |
4fe56e60 | 449 | goto err_put; |
ffa995e0 ML |
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(hard_iface->soft_iface); | |
463 | ||
39c75a51 | 464 | if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) |
ffa995e0 ML |
465 | goto err_free; |
466 | ||
467 | /* discard frames on not active interfaces */ | |
e9a4f295 | 468 | if (hard_iface->if_status != BATADV_IF_ACTIVE) |
ffa995e0 ML |
469 | goto err_free; |
470 | ||
96412690 | 471 | batadv_ogm_packet = (struct batadv_ogm_packet *)skb->data; |
ffa995e0 | 472 | |
a40d9b07 | 473 | if (batadv_ogm_packet->version != BATADV_COMPAT_VERSION) { |
39c75a51 | 474 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 475 | "Drop packet: incompatible batman version (%i)\n", |
a40d9b07 | 476 | batadv_ogm_packet->version); |
ffa995e0 ML |
477 | goto err_free; |
478 | } | |
479 | ||
e0d9677e MH |
480 | /* reset control block to avoid left overs from previous users */ |
481 | memset(skb->cb, 0, sizeof(struct batadv_skb_cb)); | |
482 | ||
a40d9b07 | 483 | idx = batadv_ogm_packet->packet_type; |
b91a2543 | 484 | (*batadv_rx_handler[idx])(skb, hard_iface); |
ffa995e0 | 485 | |
4fe56e60 SE |
486 | batadv_hardif_put(hard_iface); |
487 | ||
ffa995e0 ML |
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); | |
4fe56e60 SE |
496 | err_put: |
497 | batadv_hardif_put(hard_iface); | |
ffa995e0 ML |
498 | err_out: |
499 | return NET_RX_DROP; | |
500 | } | |
501 | ||
ee11ad61 | 502 | static void batadv_recv_handler_init(void) |
ffa995e0 ML |
503 | { |
504 | int i; | |
505 | ||
ee11ad61 SE |
506 | for (i = 0; i < ARRAY_SIZE(batadv_rx_handler); i++) |
507 | batadv_rx_handler[i] = batadv_recv_unhandled_packet; | |
ffa995e0 | 508 | |
a1f1ac5c SW |
509 | for (i = BATADV_UNICAST_MIN; i <= BATADV_UNICAST_MAX; i++) |
510 | batadv_rx_handler[i] = batadv_recv_unhandled_unicast_packet; | |
511 | ||
031ace8d SW |
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); | |
80067c83 | 529 | |
c593642c | 530 | i = sizeof_field(struct sk_buff, cb); |
e2d9ba43 LL |
531 | BUILD_BUG_ON(sizeof(struct batadv_skb_cb) > i); |
532 | ||
a1f1ac5c SW |
533 | /* broadcast packet */ |
534 | batadv_rx_handler[BATADV_BCAST] = batadv_recv_bcast_packet; | |
535 | ||
536 | /* unicast packets ... */ | |
7cdcf6dd AQ |
537 | /* unicast with 4 addresses packet */ |
538 | batadv_rx_handler[BATADV_UNICAST_4ADDR] = batadv_recv_unicast_packet; | |
ffa995e0 | 539 | /* unicast packet */ |
acd34afa | 540 | batadv_rx_handler[BATADV_UNICAST] = batadv_recv_unicast_packet; |
ef261577 ML |
541 | /* unicast tvlv packet */ |
542 | batadv_rx_handler[BATADV_UNICAST_TVLV] = batadv_recv_unicast_tvlv; | |
a1f1ac5c SW |
543 | /* batman icmp packet */ |
544 | batadv_rx_handler[BATADV_ICMP] = batadv_recv_icmp_packet; | |
610bfc6b MH |
545 | /* Fragmented packets */ |
546 | batadv_rx_handler[BATADV_UNICAST_FRAG] = batadv_recv_frag_packet; | |
ffa995e0 ML |
547 | } |
548 | ||
ff15c27c SE |
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 | */ | |
56303d34 | 556 | int |
6b5e971a | 557 | batadv_recv_handler_register(u8 packet_type, |
56303d34 SE |
558 | int (*recv_handler)(struct sk_buff *, |
559 | struct batadv_hard_iface *)) | |
ffa995e0 | 560 | { |
706cc9f5 SE |
561 | int (*curr)(struct sk_buff *skb, |
562 | struct batadv_hard_iface *recv_if); | |
a1f1ac5c SW |
563 | curr = batadv_rx_handler[packet_type]; |
564 | ||
825ffe1f SE |
565 | if (curr != batadv_recv_unhandled_packet && |
566 | curr != batadv_recv_unhandled_unicast_packet) | |
ffa995e0 ML |
567 | return -EBUSY; |
568 | ||
ee11ad61 | 569 | batadv_rx_handler[packet_type] = recv_handler; |
ffa995e0 ML |
570 | return 0; |
571 | } | |
572 | ||
ff15c27c SE |
573 | /** |
574 | * batadv_recv_handler_unregister() - Unregister handler for packet type | |
575 | * @packet_type: batadv_packettype which should no longer be handled | |
576 | */ | |
6b5e971a | 577 | void batadv_recv_handler_unregister(u8 packet_type) |
ffa995e0 | 578 | { |
ee11ad61 | 579 | batadv_rx_handler[packet_type] = batadv_recv_unhandled_packet; |
ffa995e0 ML |
580 | } |
581 | ||
95a066d8 | 582 | /** |
7e9a8c2c | 583 | * batadv_skb_crc32() - calculate CRC32 of the whole packet and skip bytes in |
95a066d8 SE |
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. | |
7afcbbef SE |
591 | * |
592 | * Return: big endian crc32c of the checksummed data | |
95a066d8 SE |
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); | |
607 | while ((len = skb_seq_read(consumed, &data, &st)) != 0) { | |
608 | crc = crc32c(crc, data, len); | |
609 | consumed += len; | |
610 | } | |
95a066d8 SE |
611 | |
612 | return htonl(crc); | |
613 | } | |
614 | ||
c018ad3d | 615 | /** |
7e9a8c2c | 616 | * batadv_get_vid() - extract the VLAN identifier from skb if any |
c018ad3d AQ |
617 | * @skb: the buffer containing the packet |
618 | * @header_len: length of the batman header preceding the ethernet header | |
619 | * | |
62fe710f SE |
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. | |
c018ad3d AQ |
622 | */ |
623 | unsigned short batadv_get_vid(struct sk_buff *skb, size_t header_len) | |
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, 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 | ||
eceb22ae | 642 | /** |
7e9a8c2c | 643 | * batadv_vlan_ap_isola_get() - return AP isolation status for the given vlan |
eceb22ae AQ |
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 | * | |
bccb48c8 | 648 | * Return: true if AP isolation is on for the VLAN identified by vid, false |
eceb22ae AQ |
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(&vlan->ap_isolation); | |
9c3bf081 | 662 | batadv_softif_vlan_put(vlan); |
eceb22ae AQ |
663 | } |
664 | ||
665 | return ap_isolation_enabled; | |
666 | } | |
667 | ||
0fa4c30d SE |
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 | "%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 | "%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 | "%s%s", BATADV_UEV_DATA_VAR, data); | |
703 | if (!uevent_env[2]) | |
704 | goto out; | |
705 | } | |
706 | ||
707 | ret = kobject_uevent_env(bat_kobj, KOBJ_CHANGE, uevent_env); | |
708 | out: | |
709 | kfree(uevent_env[0]); | |
710 | kfree(uevent_env[1]); | |
711 | kfree(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 | ||
ee11ad61 SE |
722 | module_init(batadv_init); |
723 | module_exit(batadv_exit); | |
c6c8fea2 SE |
724 | |
725 | MODULE_LICENSE("GPL"); | |
726 | ||
42d0b044 SE |
727 | MODULE_AUTHOR(BATADV_DRIVER_AUTHOR); |
728 | MODULE_DESCRIPTION(BATADV_DRIVER_DESC); | |
42d0b044 | 729 | MODULE_VERSION(BATADV_SOURCE_VERSION); |
9791860c | 730 | MODULE_ALIAS_RTNL_LINK("batadv"); |
2c0c06ff | 731 | MODULE_ALIAS_GENL_FAMILY(BATADV_NL_NAME); |