Commit | Line | Data |
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7db7d9f3 | 1 | // SPDX-License-Identifier: GPL-2.0 |
68e039f9 | 2 | /* Copyright (C) 2007-2020 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> |
95a066d8 | 12 | #include <linux/crc32c.h> |
0fa4c30d | 13 | #include <linux/device.h> |
1e2c2a4f | 14 | #include <linux/errno.h> |
2c0c06ff | 15 | #include <linux/genetlink.h> |
b92b94ac | 16 | #include <linux/gfp.h> |
1e2c2a4f | 17 | #include <linux/if_ether.h> |
c54f38c9 | 18 | #include <linux/if_vlan.h> |
1e2c2a4f SE |
19 | #include <linux/init.h> |
20 | #include <linux/ip.h> | |
21 | #include <linux/ipv6.h> | |
22 | #include <linux/kernel.h> | |
0fa4c30d | 23 | #include <linux/kobject.h> |
f7157dd1 | 24 | #include <linux/kref.h> |
1e2c2a4f SE |
25 | #include <linux/list.h> |
26 | #include <linux/module.h> | |
1e2c2a4f | 27 | #include <linux/netdevice.h> |
ba412080 | 28 | #include <linux/printk.h> |
1e2c2a4f SE |
29 | #include <linux/rculist.h> |
30 | #include <linux/rcupdate.h> | |
31 | #include <linux/seq_file.h> | |
32 | #include <linux/skbuff.h> | |
0fa4c30d | 33 | #include <linux/slab.h> |
1e2c2a4f SE |
34 | #include <linux/spinlock.h> |
35 | #include <linux/stddef.h> | |
36 | #include <linux/string.h> | |
37 | #include <linux/workqueue.h> | |
c54f38c9 | 38 | #include <net/dsfield.h> |
1e2c2a4f | 39 | #include <net/rtnetlink.h> |
fec149f5 | 40 | #include <uapi/linux/batadv_packet.h> |
2c0c06ff | 41 | #include <uapi/linux/batman_adv.h> |
1e2c2a4f SE |
42 | |
43 | #include "bat_algo.h" | |
a2d08166 SE |
44 | #include "bat_iv_ogm.h" |
45 | #include "bat_v.h" | |
1e2c2a4f | 46 | #include "bridge_loop_avoidance.h" |
b706b13b | 47 | #include "debugfs.h" |
1e2c2a4f SE |
48 | #include "distributed-arp-table.h" |
49 | #include "gateway_client.h" | |
50 | #include "gateway_common.h" | |
51 | #include "hard-interface.h" | |
52 | #include "icmp_socket.h" | |
ba412080 | 53 | #include "log.h" |
1e2c2a4f | 54 | #include "multicast.h" |
09748a22 | 55 | #include "netlink.h" |
1e2c2a4f SE |
56 | #include "network-coding.h" |
57 | #include "originator.h" | |
c6c8fea2 SE |
58 | #include "routing.h" |
59 | #include "send.h" | |
c6c8fea2 | 60 | #include "soft-interface.h" |
33a3bb4a | 61 | #include "tp_meter.h" |
c6c8fea2 | 62 | #include "translation-table.h" |
c6c8fea2 | 63 | |
c3caf519 | 64 | /* List manipulations on hardif_list have to be rtnl_lock()'ed, |
9cfc7bd6 SE |
65 | * list traversals just rcu-locked |
66 | */ | |
3193e8fd | 67 | struct list_head batadv_hardif_list; |
fb69be69 | 68 | unsigned int batadv_hardif_generation; |
706cc9f5 SE |
69 | static int (*batadv_rx_handler[256])(struct sk_buff *skb, |
70 | struct batadv_hard_iface *recv_if); | |
c6c8fea2 | 71 | |
3193e8fd | 72 | unsigned char batadv_broadcast_addr[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; |
c6c8fea2 | 73 | |
3193e8fd | 74 | struct workqueue_struct *batadv_event_workqueue; |
c6c8fea2 | 75 | |
ee11ad61 | 76 | static void batadv_recv_handler_init(void); |
ffa995e0 | 77 | |
0fa4c30d SE |
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 | ||
ee11ad61 | 94 | static int __init batadv_init(void) |
c6c8fea2 | 95 | { |
86452f81 SE |
96 | int ret; |
97 | ||
98 | ret = batadv_tt_cache_init(); | |
99 | if (ret < 0) | |
100 | return ret; | |
101 | ||
3193e8fd | 102 | INIT_LIST_HEAD(&batadv_hardif_list); |
01d350d1 | 103 | batadv_algo_init(); |
1c280471 | 104 | |
ee11ad61 | 105 | batadv_recv_handler_init(); |
ffa995e0 | 106 | |
d6f94d91 | 107 | batadv_v_init(); |
81c524f7 | 108 | batadv_iv_init(); |
6c519bad | 109 | batadv_nc_init(); |
33a3bb4a | 110 | batadv_tp_meter_init(); |
c6c8fea2 | 111 | |
3193e8fd | 112 | batadv_event_workqueue = create_singlethread_workqueue("bat_events"); |
3193e8fd | 113 | if (!batadv_event_workqueue) |
86452f81 | 114 | goto err_create_wq; |
c6c8fea2 | 115 | |
9039dc7e | 116 | batadv_socket_init(); |
40a072d7 | 117 | batadv_debugfs_init(); |
c6c8fea2 | 118 | |
9563877e | 119 | register_netdevice_notifier(&batadv_hard_if_notifier); |
a4ac28c0 | 120 | rtnl_link_register(&batadv_link_ops); |
09748a22 | 121 | batadv_netlink_register(); |
c6c8fea2 | 122 | |
86ceb360 | 123 | pr_info("B.A.T.M.A.N. advanced %s (compatibility version %i) loaded\n", |
42d0b044 | 124 | BATADV_SOURCE_VERSION, BATADV_COMPAT_VERSION); |
c6c8fea2 SE |
125 | |
126 | return 0; | |
86452f81 SE |
127 | |
128 | err_create_wq: | |
129 | batadv_tt_cache_destroy(); | |
130 | ||
131 | return -ENOMEM; | |
c6c8fea2 SE |
132 | } |
133 | ||
ee11ad61 | 134 | static void __exit batadv_exit(void) |
c6c8fea2 | 135 | { |
40a072d7 | 136 | batadv_debugfs_destroy(); |
09748a22 | 137 | batadv_netlink_unregister(); |
a4ac28c0 | 138 | rtnl_link_unregister(&batadv_link_ops); |
9563877e SE |
139 | unregister_netdevice_notifier(&batadv_hard_if_notifier); |
140 | batadv_hardif_remove_interfaces(); | |
c6c8fea2 | 141 | |
3193e8fd SE |
142 | flush_workqueue(batadv_event_workqueue); |
143 | destroy_workqueue(batadv_event_workqueue); | |
144 | batadv_event_workqueue = NULL; | |
c6c8fea2 SE |
145 | |
146 | rcu_barrier(); | |
86452f81 SE |
147 | |
148 | batadv_tt_cache_destroy(); | |
c6c8fea2 SE |
149 | } |
150 | ||
ff15c27c SE |
151 | /** |
152 | * batadv_mesh_init() - Initialize soft interface | |
153 | * @soft_iface: netdev struct of the soft interface | |
154 | * | |
155 | * Return: 0 on success or negative error number in case of failure | |
156 | */ | |
3193e8fd | 157 | int batadv_mesh_init(struct net_device *soft_iface) |
c6c8fea2 | 158 | { |
56303d34 | 159 | struct batadv_priv *bat_priv = netdev_priv(soft_iface); |
5346c35e | 160 | int ret; |
c6c8fea2 | 161 | |
c6c8fea2 SE |
162 | spin_lock_init(&bat_priv->forw_bat_list_lock); |
163 | spin_lock_init(&bat_priv->forw_bcast_list_lock); | |
807736f6 SE |
164 | spin_lock_init(&bat_priv->tt.changes_list_lock); |
165 | spin_lock_init(&bat_priv->tt.req_list_lock); | |
166 | spin_lock_init(&bat_priv->tt.roam_list_lock); | |
167 | spin_lock_init(&bat_priv->tt.last_changeset_lock); | |
a70a9aa9 | 168 | spin_lock_init(&bat_priv->tt.commit_lock); |
807736f6 | 169 | spin_lock_init(&bat_priv->gw.list_lock); |
ab49886e | 170 | #ifdef CONFIG_BATMAN_ADV_MCAST |
a3c7cd0c | 171 | spin_lock_init(&bat_priv->mcast.mla_lock); |
ab49886e LL |
172 | spin_lock_init(&bat_priv->mcast.want_lists_lock); |
173 | #endif | |
ef261577 ML |
174 | spin_lock_init(&bat_priv->tvlv.container_list_lock); |
175 | spin_lock_init(&bat_priv->tvlv.handler_list_lock); | |
5d2c05b2 | 176 | spin_lock_init(&bat_priv->softif_vlan_list_lock); |
33a3bb4a | 177 | spin_lock_init(&bat_priv->tp_list_lock); |
c6c8fea2 SE |
178 | |
179 | INIT_HLIST_HEAD(&bat_priv->forw_bat_list); | |
180 | INIT_HLIST_HEAD(&bat_priv->forw_bcast_list); | |
70ea5cee | 181 | INIT_HLIST_HEAD(&bat_priv->gw.gateway_list); |
ab49886e LL |
182 | #ifdef CONFIG_BATMAN_ADV_MCAST |
183 | INIT_HLIST_HEAD(&bat_priv->mcast.want_all_unsnoopables_list); | |
4c8755d6 LL |
184 | INIT_HLIST_HEAD(&bat_priv->mcast.want_all_ipv4_list); |
185 | INIT_HLIST_HEAD(&bat_priv->mcast.want_all_ipv6_list); | |
ab49886e | 186 | #endif |
807736f6 | 187 | INIT_LIST_HEAD(&bat_priv->tt.changes_list); |
7c26a53b | 188 | INIT_HLIST_HEAD(&bat_priv->tt.req_list); |
807736f6 | 189 | INIT_LIST_HEAD(&bat_priv->tt.roam_list); |
c5caf4ef LL |
190 | #ifdef CONFIG_BATMAN_ADV_MCAST |
191 | INIT_HLIST_HEAD(&bat_priv->mcast.mla_list); | |
192 | #endif | |
ef261577 ML |
193 | INIT_HLIST_HEAD(&bat_priv->tvlv.container_list); |
194 | INIT_HLIST_HEAD(&bat_priv->tvlv.handler_list); | |
5d2c05b2 | 195 | INIT_HLIST_HEAD(&bat_priv->softif_vlan_list); |
33a3bb4a | 196 | INIT_HLIST_HEAD(&bat_priv->tp_list); |
c6c8fea2 | 197 | |
9264c85c SE |
198 | bat_priv->gw.generation = 0; |
199 | ||
0da00359 AQ |
200 | ret = batadv_v_mesh_init(bat_priv); |
201 | if (ret < 0) | |
202 | goto err; | |
203 | ||
7d211efc | 204 | ret = batadv_originator_init(bat_priv); |
5346c35e | 205 | if (ret < 0) |
c6c8fea2 SE |
206 | goto err; |
207 | ||
08c36d3e | 208 | ret = batadv_tt_init(bat_priv); |
5346c35e | 209 | if (ret < 0) |
c6c8fea2 SE |
210 | goto err; |
211 | ||
08adf151 | 212 | ret = batadv_bla_init(bat_priv); |
5346c35e | 213 | if (ret < 0) |
23721387 SW |
214 | goto err; |
215 | ||
2f1dfbe1 AQ |
216 | ret = batadv_dat_init(bat_priv); |
217 | if (ret < 0) | |
218 | goto err; | |
219 | ||
6c519bad | 220 | ret = batadv_nc_mesh_init(bat_priv); |
d353d8d4 MH |
221 | if (ret < 0) |
222 | goto err; | |
223 | ||
414254e3 | 224 | batadv_gw_init(bat_priv); |
60432d75 | 225 | batadv_mcast_init(bat_priv); |
414254e3 | 226 | |
807736f6 | 227 | atomic_set(&bat_priv->gw.reselect, 0); |
39c75a51 | 228 | atomic_set(&bat_priv->mesh_state, BATADV_MESH_ACTIVE); |
5346c35e SE |
229 | |
230 | return 0; | |
c6c8fea2 SE |
231 | |
232 | err: | |
3193e8fd | 233 | batadv_mesh_free(soft_iface); |
5346c35e | 234 | return ret; |
c6c8fea2 SE |
235 | } |
236 | ||
ff15c27c SE |
237 | /** |
238 | * batadv_mesh_free() - Deinitialize soft interface | |
239 | * @soft_iface: netdev struct of the soft interface | |
240 | */ | |
3193e8fd | 241 | void batadv_mesh_free(struct net_device *soft_iface) |
c6c8fea2 | 242 | { |
56303d34 | 243 | struct batadv_priv *bat_priv = netdev_priv(soft_iface); |
c6c8fea2 | 244 | |
39c75a51 | 245 | atomic_set(&bat_priv->mesh_state, BATADV_MESH_DEACTIVATING); |
c6c8fea2 | 246 | |
9455e34c | 247 | batadv_purge_outstanding_packets(bat_priv, NULL); |
c6c8fea2 | 248 | |
bd3524c1 | 249 | batadv_gw_node_free(bat_priv); |
0da00359 AQ |
250 | |
251 | batadv_v_mesh_free(bat_priv); | |
6c519bad | 252 | batadv_nc_mesh_free(bat_priv); |
a4361860 AQ |
253 | batadv_dat_free(bat_priv); |
254 | batadv_bla_free(bat_priv); | |
c6c8fea2 | 255 | |
c5caf4ef LL |
256 | batadv_mcast_free(bat_priv); |
257 | ||
a4361860 AQ |
258 | /* Free the TT and the originator tables only after having terminated |
259 | * all the other depending components which may use these structures for | |
260 | * their purposes. | |
261 | */ | |
08c36d3e | 262 | batadv_tt_free(bat_priv); |
c6c8fea2 | 263 | |
a4361860 AQ |
264 | /* Since the originator table clean up routine is accessing the TT |
265 | * tables as well, it has to be invoked after the TT tables have been | |
266 | * freed and marked as empty. This ensures that no cleanup RCU callbacks | |
267 | * accessing the TT data are scheduled for later execution. | |
268 | */ | |
269 | batadv_originator_free(bat_priv); | |
2f1dfbe1 | 270 | |
414254e3 ML |
271 | batadv_gw_free(bat_priv); |
272 | ||
f8214865 | 273 | free_percpu(bat_priv->bat_counters); |
f69ae770 | 274 | bat_priv->bat_counters = NULL; |
f8214865 | 275 | |
39c75a51 | 276 | atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE); |
c6c8fea2 SE |
277 | } |
278 | ||
6e0895c2 | 279 | /** |
7e9a8c2c SE |
280 | * batadv_is_my_mac() - check if the given mac address belongs to any of the |
281 | * real interfaces in the current mesh | |
6e0895c2 DM |
282 | * @bat_priv: the bat priv with all the soft interface information |
283 | * @addr: the address to check | |
e8ad3b1a | 284 | * |
62fe710f | 285 | * Return: 'true' if the mac address was found, false otherwise. |
6e0895c2 | 286 | */ |
6b5e971a | 287 | bool batadv_is_my_mac(struct batadv_priv *bat_priv, const u8 *addr) |
c6c8fea2 | 288 | { |
56303d34 | 289 | const struct batadv_hard_iface *hard_iface; |
e8ad3b1a | 290 | bool is_my_mac = false; |
c6c8fea2 SE |
291 | |
292 | rcu_read_lock(); | |
3193e8fd | 293 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e9a4f295 | 294 | if (hard_iface->if_status != BATADV_IF_ACTIVE) |
c6c8fea2 SE |
295 | continue; |
296 | ||
fe8a93b9 AQ |
297 | if (hard_iface->soft_iface != bat_priv->soft_iface) |
298 | continue; | |
299 | ||
1eda58bf | 300 | if (batadv_compare_eth(hard_iface->net_dev->dev_addr, addr)) { |
e8ad3b1a MP |
301 | is_my_mac = true; |
302 | break; | |
c6c8fea2 SE |
303 | } |
304 | } | |
305 | rcu_read_unlock(); | |
e8ad3b1a | 306 | return is_my_mac; |
c6c8fea2 SE |
307 | } |
308 | ||
dc1cbd14 | 309 | #ifdef CONFIG_BATMAN_ADV_DEBUGFS |
30da63a6 | 310 | /** |
7e9a8c2c | 311 | * batadv_seq_print_text_primary_if_get() - called from debugfs table printing |
30da63a6 ML |
312 | * function that requires the primary interface |
313 | * @seq: debugfs table seq_file struct | |
314 | * | |
62fe710f | 315 | * Return: primary interface if found or NULL otherwise. |
30da63a6 ML |
316 | */ |
317 | struct batadv_hard_iface * | |
318 | batadv_seq_print_text_primary_if_get(struct seq_file *seq) | |
319 | { | |
320 | struct net_device *net_dev = (struct net_device *)seq->private; | |
321 | struct batadv_priv *bat_priv = netdev_priv(net_dev); | |
322 | struct batadv_hard_iface *primary_if; | |
323 | ||
324 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
325 | ||
326 | if (!primary_if) { | |
327 | seq_printf(seq, | |
328 | "BATMAN mesh %s disabled - please specify interfaces to enable it\n", | |
329 | net_dev->name); | |
330 | goto out; | |
331 | } | |
332 | ||
333 | if (primary_if->if_status == BATADV_IF_ACTIVE) | |
334 | goto out; | |
335 | ||
336 | seq_printf(seq, | |
337 | "BATMAN mesh %s disabled - primary interface not active\n", | |
338 | net_dev->name); | |
82047ad7 | 339 | batadv_hardif_put(primary_if); |
30da63a6 ML |
340 | primary_if = NULL; |
341 | ||
342 | out: | |
343 | return primary_if; | |
344 | } | |
dc1cbd14 | 345 | #endif |
30da63a6 | 346 | |
411d6ed9 | 347 | /** |
7e9a8c2c | 348 | * batadv_max_header_len() - calculate maximum encapsulation overhead for a |
411d6ed9 ML |
349 | * payload packet |
350 | * | |
62fe710f | 351 | * Return: the maximum encapsulation overhead in bytes. |
411d6ed9 ML |
352 | */ |
353 | int batadv_max_header_len(void) | |
354 | { | |
355 | int header_len = 0; | |
356 | ||
357 | header_len = max_t(int, header_len, | |
358 | sizeof(struct batadv_unicast_packet)); | |
359 | header_len = max_t(int, header_len, | |
360 | sizeof(struct batadv_unicast_4addr_packet)); | |
361 | header_len = max_t(int, header_len, | |
362 | sizeof(struct batadv_bcast_packet)); | |
363 | ||
364 | #ifdef CONFIG_BATMAN_ADV_NC | |
365 | header_len = max_t(int, header_len, | |
366 | sizeof(struct batadv_coded_packet)); | |
367 | #endif | |
368 | ||
1df0cbd5 | 369 | return header_len + ETH_HLEN; |
411d6ed9 ML |
370 | } |
371 | ||
c54f38c9 | 372 | /** |
7e9a8c2c | 373 | * batadv_skb_set_priority() - sets skb priority according to packet content |
c54f38c9 SW |
374 | * @skb: the packet to be sent |
375 | * @offset: offset to the packet content | |
376 | * | |
377 | * This function sets a value between 256 and 263 (802.1d priority), which | |
378 | * can be interpreted by the cfg80211 or other drivers. | |
379 | */ | |
380 | void batadv_skb_set_priority(struct sk_buff *skb, int offset) | |
381 | { | |
382 | struct iphdr ip_hdr_tmp, *ip_hdr; | |
383 | struct ipv6hdr ip6_hdr_tmp, *ip6_hdr; | |
384 | struct ethhdr ethhdr_tmp, *ethhdr; | |
385 | struct vlan_ethhdr *vhdr, vhdr_tmp; | |
386 | u32 prio; | |
387 | ||
388 | /* already set, do nothing */ | |
389 | if (skb->priority >= 256 && skb->priority <= 263) | |
390 | return; | |
391 | ||
392 | ethhdr = skb_header_pointer(skb, offset, sizeof(*ethhdr), ðhdr_tmp); | |
393 | if (!ethhdr) | |
394 | return; | |
395 | ||
396 | switch (ethhdr->h_proto) { | |
397 | case htons(ETH_P_8021Q): | |
398 | vhdr = skb_header_pointer(skb, offset + sizeof(*vhdr), | |
399 | sizeof(*vhdr), &vhdr_tmp); | |
400 | if (!vhdr) | |
401 | return; | |
402 | prio = ntohs(vhdr->h_vlan_TCI) & VLAN_PRIO_MASK; | |
403 | prio = prio >> VLAN_PRIO_SHIFT; | |
404 | break; | |
405 | case htons(ETH_P_IP): | |
406 | ip_hdr = skb_header_pointer(skb, offset + sizeof(*ethhdr), | |
407 | sizeof(*ip_hdr), &ip_hdr_tmp); | |
408 | if (!ip_hdr) | |
409 | return; | |
410 | prio = (ipv4_get_dsfield(ip_hdr) & 0xfc) >> 5; | |
411 | break; | |
412 | case htons(ETH_P_IPV6): | |
413 | ip6_hdr = skb_header_pointer(skb, offset + sizeof(*ethhdr), | |
414 | sizeof(*ip6_hdr), &ip6_hdr_tmp); | |
415 | if (!ip6_hdr) | |
416 | return; | |
417 | prio = (ipv6_get_dsfield(ip6_hdr) & 0xfc) >> 5; | |
418 | break; | |
419 | default: | |
420 | return; | |
421 | } | |
422 | ||
423 | skb->priority = prio + 256; | |
424 | } | |
425 | ||
ee11ad61 | 426 | static int batadv_recv_unhandled_packet(struct sk_buff *skb, |
56303d34 | 427 | struct batadv_hard_iface *recv_if) |
ffa995e0 | 428 | { |
b91a2543 SE |
429 | kfree_skb(skb); |
430 | ||
ffa995e0 ML |
431 | return NET_RX_DROP; |
432 | } | |
433 | ||
434 | /* incoming packets with the batman ethertype received on any active hard | |
435 | * interface | |
436 | */ | |
ff15c27c SE |
437 | |
438 | /** | |
439 | * batadv_batman_skb_recv() - Handle incoming message from an hard interface | |
440 | * @skb: the received packet | |
441 | * @dev: the net device that the packet was received on | |
442 | * @ptype: packet type of incoming packet (ETH_P_BATMAN) | |
443 | * @orig_dev: the original receive net device (e.g. bonded device) | |
444 | * | |
445 | * Return: NET_RX_SUCCESS on success or NET_RX_DROP in case of failure | |
446 | */ | |
3193e8fd SE |
447 | int batadv_batman_skb_recv(struct sk_buff *skb, struct net_device *dev, |
448 | struct packet_type *ptype, | |
449 | struct net_device *orig_dev) | |
ffa995e0 | 450 | { |
56303d34 | 451 | struct batadv_priv *bat_priv; |
96412690 | 452 | struct batadv_ogm_packet *batadv_ogm_packet; |
56303d34 | 453 | struct batadv_hard_iface *hard_iface; |
6b5e971a | 454 | u8 idx; |
ffa995e0 | 455 | |
56303d34 SE |
456 | hard_iface = container_of(ptype, struct batadv_hard_iface, |
457 | batman_adv_ptype); | |
4fe56e60 SE |
458 | |
459 | /* Prevent processing a packet received on an interface which is getting | |
460 | * shut down otherwise the packet may trigger de-reference errors | |
461 | * further down in the receive path. | |
462 | */ | |
463 | if (!kref_get_unless_zero(&hard_iface->refcount)) | |
464 | goto err_out; | |
465 | ||
ffa995e0 ML |
466 | skb = skb_share_check(skb, GFP_ATOMIC); |
467 | ||
468 | /* skb was released by skb_share_check() */ | |
469 | if (!skb) | |
4fe56e60 | 470 | goto err_put; |
ffa995e0 ML |
471 | |
472 | /* packet should hold at least type and version */ | |
473 | if (unlikely(!pskb_may_pull(skb, 2))) | |
474 | goto err_free; | |
475 | ||
476 | /* expect a valid ethernet header here. */ | |
477 | if (unlikely(skb->mac_len != ETH_HLEN || !skb_mac_header(skb))) | |
478 | goto err_free; | |
479 | ||
480 | if (!hard_iface->soft_iface) | |
481 | goto err_free; | |
482 | ||
483 | bat_priv = netdev_priv(hard_iface->soft_iface); | |
484 | ||
39c75a51 | 485 | if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) |
ffa995e0 ML |
486 | goto err_free; |
487 | ||
488 | /* discard frames on not active interfaces */ | |
e9a4f295 | 489 | if (hard_iface->if_status != BATADV_IF_ACTIVE) |
ffa995e0 ML |
490 | goto err_free; |
491 | ||
96412690 | 492 | batadv_ogm_packet = (struct batadv_ogm_packet *)skb->data; |
ffa995e0 | 493 | |
a40d9b07 | 494 | if (batadv_ogm_packet->version != BATADV_COMPAT_VERSION) { |
39c75a51 | 495 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 496 | "Drop packet: incompatible batman version (%i)\n", |
a40d9b07 | 497 | batadv_ogm_packet->version); |
ffa995e0 ML |
498 | goto err_free; |
499 | } | |
500 | ||
e0d9677e MH |
501 | /* reset control block to avoid left overs from previous users */ |
502 | memset(skb->cb, 0, sizeof(struct batadv_skb_cb)); | |
503 | ||
a40d9b07 | 504 | idx = batadv_ogm_packet->packet_type; |
b91a2543 | 505 | (*batadv_rx_handler[idx])(skb, hard_iface); |
ffa995e0 | 506 | |
4fe56e60 SE |
507 | batadv_hardif_put(hard_iface); |
508 | ||
ffa995e0 ML |
509 | /* return NET_RX_SUCCESS in any case as we |
510 | * most probably dropped the packet for | |
511 | * routing-logical reasons. | |
512 | */ | |
513 | return NET_RX_SUCCESS; | |
514 | ||
515 | err_free: | |
516 | kfree_skb(skb); | |
4fe56e60 SE |
517 | err_put: |
518 | batadv_hardif_put(hard_iface); | |
ffa995e0 ML |
519 | err_out: |
520 | return NET_RX_DROP; | |
521 | } | |
522 | ||
ee11ad61 | 523 | static void batadv_recv_handler_init(void) |
ffa995e0 ML |
524 | { |
525 | int i; | |
526 | ||
ee11ad61 SE |
527 | for (i = 0; i < ARRAY_SIZE(batadv_rx_handler); i++) |
528 | batadv_rx_handler[i] = batadv_recv_unhandled_packet; | |
ffa995e0 | 529 | |
a1f1ac5c SW |
530 | for (i = BATADV_UNICAST_MIN; i <= BATADV_UNICAST_MAX; i++) |
531 | batadv_rx_handler[i] = batadv_recv_unhandled_unicast_packet; | |
532 | ||
031ace8d SW |
533 | /* compile time checks for sizes */ |
534 | BUILD_BUG_ON(sizeof(struct batadv_bla_claim_dst) != 6); | |
535 | BUILD_BUG_ON(sizeof(struct batadv_ogm_packet) != 24); | |
536 | BUILD_BUG_ON(sizeof(struct batadv_icmp_header) != 20); | |
537 | BUILD_BUG_ON(sizeof(struct batadv_icmp_packet) != 20); | |
538 | BUILD_BUG_ON(sizeof(struct batadv_icmp_packet_rr) != 116); | |
539 | BUILD_BUG_ON(sizeof(struct batadv_unicast_packet) != 10); | |
540 | BUILD_BUG_ON(sizeof(struct batadv_unicast_4addr_packet) != 18); | |
541 | BUILD_BUG_ON(sizeof(struct batadv_frag_packet) != 20); | |
542 | BUILD_BUG_ON(sizeof(struct batadv_bcast_packet) != 14); | |
543 | BUILD_BUG_ON(sizeof(struct batadv_coded_packet) != 46); | |
544 | BUILD_BUG_ON(sizeof(struct batadv_unicast_tvlv_packet) != 20); | |
545 | BUILD_BUG_ON(sizeof(struct batadv_tvlv_hdr) != 4); | |
546 | BUILD_BUG_ON(sizeof(struct batadv_tvlv_gateway_data) != 8); | |
547 | BUILD_BUG_ON(sizeof(struct batadv_tvlv_tt_vlan_data) != 8); | |
548 | BUILD_BUG_ON(sizeof(struct batadv_tvlv_tt_change) != 12); | |
549 | BUILD_BUG_ON(sizeof(struct batadv_tvlv_roam_adv) != 8); | |
80067c83 | 550 | |
c593642c | 551 | i = sizeof_field(struct sk_buff, cb); |
e2d9ba43 LL |
552 | BUILD_BUG_ON(sizeof(struct batadv_skb_cb) > i); |
553 | ||
a1f1ac5c SW |
554 | /* broadcast packet */ |
555 | batadv_rx_handler[BATADV_BCAST] = batadv_recv_bcast_packet; | |
556 | ||
557 | /* unicast packets ... */ | |
7cdcf6dd AQ |
558 | /* unicast with 4 addresses packet */ |
559 | batadv_rx_handler[BATADV_UNICAST_4ADDR] = batadv_recv_unicast_packet; | |
ffa995e0 | 560 | /* unicast packet */ |
acd34afa | 561 | batadv_rx_handler[BATADV_UNICAST] = batadv_recv_unicast_packet; |
ef261577 ML |
562 | /* unicast tvlv packet */ |
563 | batadv_rx_handler[BATADV_UNICAST_TVLV] = batadv_recv_unicast_tvlv; | |
a1f1ac5c SW |
564 | /* batman icmp packet */ |
565 | batadv_rx_handler[BATADV_ICMP] = batadv_recv_icmp_packet; | |
610bfc6b MH |
566 | /* Fragmented packets */ |
567 | batadv_rx_handler[BATADV_UNICAST_FRAG] = batadv_recv_frag_packet; | |
ffa995e0 ML |
568 | } |
569 | ||
ff15c27c SE |
570 | /** |
571 | * batadv_recv_handler_register() - Register handler for batman-adv packet type | |
572 | * @packet_type: batadv_packettype which should be handled | |
573 | * @recv_handler: receive handler for the packet type | |
574 | * | |
575 | * Return: 0 on success or negative error number in case of failure | |
576 | */ | |
56303d34 | 577 | int |
6b5e971a | 578 | batadv_recv_handler_register(u8 packet_type, |
56303d34 SE |
579 | int (*recv_handler)(struct sk_buff *, |
580 | struct batadv_hard_iface *)) | |
ffa995e0 | 581 | { |
706cc9f5 SE |
582 | int (*curr)(struct sk_buff *skb, |
583 | struct batadv_hard_iface *recv_if); | |
a1f1ac5c SW |
584 | curr = batadv_rx_handler[packet_type]; |
585 | ||
825ffe1f SE |
586 | if (curr != batadv_recv_unhandled_packet && |
587 | curr != batadv_recv_unhandled_unicast_packet) | |
ffa995e0 ML |
588 | return -EBUSY; |
589 | ||
ee11ad61 | 590 | batadv_rx_handler[packet_type] = recv_handler; |
ffa995e0 ML |
591 | return 0; |
592 | } | |
593 | ||
ff15c27c SE |
594 | /** |
595 | * batadv_recv_handler_unregister() - Unregister handler for packet type | |
596 | * @packet_type: batadv_packettype which should no longer be handled | |
597 | */ | |
6b5e971a | 598 | void batadv_recv_handler_unregister(u8 packet_type) |
ffa995e0 | 599 | { |
ee11ad61 | 600 | batadv_rx_handler[packet_type] = batadv_recv_unhandled_packet; |
ffa995e0 ML |
601 | } |
602 | ||
95a066d8 | 603 | /** |
7e9a8c2c | 604 | * batadv_skb_crc32() - calculate CRC32 of the whole packet and skip bytes in |
95a066d8 SE |
605 | * the header |
606 | * @skb: skb pointing to fragmented socket buffers | |
607 | * @payload_ptr: Pointer to position inside the head buffer of the skb | |
608 | * marking the start of the data to be CRC'ed | |
609 | * | |
610 | * payload_ptr must always point to an address in the skb head buffer and not to | |
611 | * a fragment. | |
7afcbbef SE |
612 | * |
613 | * Return: big endian crc32c of the checksummed data | |
95a066d8 SE |
614 | */ |
615 | __be32 batadv_skb_crc32(struct sk_buff *skb, u8 *payload_ptr) | |
616 | { | |
617 | u32 crc = 0; | |
618 | unsigned int from; | |
619 | unsigned int to = skb->len; | |
620 | struct skb_seq_state st; | |
621 | const u8 *data; | |
622 | unsigned int len; | |
623 | unsigned int consumed = 0; | |
624 | ||
625 | from = (unsigned int)(payload_ptr - skb->data); | |
626 | ||
627 | skb_prepare_seq_read(skb, from, to, &st); | |
628 | while ((len = skb_seq_read(consumed, &data, &st)) != 0) { | |
629 | crc = crc32c(crc, data, len); | |
630 | consumed += len; | |
631 | } | |
95a066d8 SE |
632 | |
633 | return htonl(crc); | |
634 | } | |
635 | ||
c018ad3d | 636 | /** |
7e9a8c2c | 637 | * batadv_get_vid() - extract the VLAN identifier from skb if any |
c018ad3d AQ |
638 | * @skb: the buffer containing the packet |
639 | * @header_len: length of the batman header preceding the ethernet header | |
640 | * | |
62fe710f SE |
641 | * Return: VID with the BATADV_VLAN_HAS_TAG flag when the packet embedded in the |
642 | * skb is vlan tagged. Otherwise BATADV_NO_FLAGS. | |
c018ad3d AQ |
643 | */ |
644 | unsigned short batadv_get_vid(struct sk_buff *skb, size_t header_len) | |
645 | { | |
646 | struct ethhdr *ethhdr = (struct ethhdr *)(skb->data + header_len); | |
647 | struct vlan_ethhdr *vhdr; | |
648 | unsigned short vid; | |
649 | ||
650 | if (ethhdr->h_proto != htons(ETH_P_8021Q)) | |
651 | return BATADV_NO_FLAGS; | |
652 | ||
653 | if (!pskb_may_pull(skb, header_len + VLAN_ETH_HLEN)) | |
654 | return BATADV_NO_FLAGS; | |
655 | ||
656 | vhdr = (struct vlan_ethhdr *)(skb->data + header_len); | |
657 | vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK; | |
658 | vid |= BATADV_VLAN_HAS_TAG; | |
659 | ||
660 | return vid; | |
661 | } | |
662 | ||
eceb22ae | 663 | /** |
7e9a8c2c | 664 | * batadv_vlan_ap_isola_get() - return AP isolation status for the given vlan |
eceb22ae AQ |
665 | * @bat_priv: the bat priv with all the soft interface information |
666 | * @vid: the VLAN identifier for which the AP isolation attributed as to be | |
667 | * looked up | |
668 | * | |
62fe710f | 669 | * Return: true if AP isolation is on for the VLAN idenfied by vid, false |
eceb22ae AQ |
670 | * otherwise |
671 | */ | |
672 | bool batadv_vlan_ap_isola_get(struct batadv_priv *bat_priv, unsigned short vid) | |
673 | { | |
674 | bool ap_isolation_enabled = false; | |
675 | struct batadv_softif_vlan *vlan; | |
676 | ||
677 | /* if the AP isolation is requested on a VLAN, then check for its | |
678 | * setting in the proper VLAN private data structure | |
679 | */ | |
680 | vlan = batadv_softif_vlan_get(bat_priv, vid); | |
681 | if (vlan) { | |
682 | ap_isolation_enabled = atomic_read(&vlan->ap_isolation); | |
9c3bf081 | 683 | batadv_softif_vlan_put(vlan); |
eceb22ae AQ |
684 | } |
685 | ||
686 | return ap_isolation_enabled; | |
687 | } | |
688 | ||
0fa4c30d SE |
689 | /** |
690 | * batadv_throw_uevent() - Send an uevent with batman-adv specific env data | |
691 | * @bat_priv: the bat priv with all the soft interface information | |
692 | * @type: subsystem type of event. Stored in uevent's BATTYPE | |
693 | * @action: action type of event. Stored in uevent's BATACTION | |
694 | * @data: string with additional information to the event (ignored for | |
695 | * BATADV_UEV_DEL). Stored in uevent's BATDATA | |
696 | * | |
697 | * Return: 0 on success or negative error number in case of failure | |
698 | */ | |
699 | int batadv_throw_uevent(struct batadv_priv *bat_priv, enum batadv_uev_type type, | |
700 | enum batadv_uev_action action, const char *data) | |
701 | { | |
702 | int ret = -ENOMEM; | |
703 | struct kobject *bat_kobj; | |
704 | char *uevent_env[4] = { NULL, NULL, NULL, NULL }; | |
705 | ||
706 | bat_kobj = &bat_priv->soft_iface->dev.kobj; | |
707 | ||
708 | uevent_env[0] = kasprintf(GFP_ATOMIC, | |
709 | "%s%s", BATADV_UEV_TYPE_VAR, | |
710 | batadv_uev_type_str[type]); | |
711 | if (!uevent_env[0]) | |
712 | goto out; | |
713 | ||
714 | uevent_env[1] = kasprintf(GFP_ATOMIC, | |
715 | "%s%s", BATADV_UEV_ACTION_VAR, | |
716 | batadv_uev_action_str[action]); | |
717 | if (!uevent_env[1]) | |
718 | goto out; | |
719 | ||
720 | /* If the event is DEL, ignore the data field */ | |
721 | if (action != BATADV_UEV_DEL) { | |
722 | uevent_env[2] = kasprintf(GFP_ATOMIC, | |
723 | "%s%s", BATADV_UEV_DATA_VAR, data); | |
724 | if (!uevent_env[2]) | |
725 | goto out; | |
726 | } | |
727 | ||
728 | ret = kobject_uevent_env(bat_kobj, KOBJ_CHANGE, uevent_env); | |
729 | out: | |
730 | kfree(uevent_env[0]); | |
731 | kfree(uevent_env[1]); | |
732 | kfree(uevent_env[2]); | |
733 | ||
734 | if (ret) | |
735 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
736 | "Impossible to send uevent for (%s,%s,%s) event (err: %d)\n", | |
737 | batadv_uev_type_str[type], | |
738 | batadv_uev_action_str[action], | |
739 | (action == BATADV_UEV_DEL ? "NULL" : data), ret); | |
740 | return ret; | |
741 | } | |
742 | ||
ee11ad61 SE |
743 | module_init(batadv_init); |
744 | module_exit(batadv_exit); | |
c6c8fea2 SE |
745 | |
746 | MODULE_LICENSE("GPL"); | |
747 | ||
42d0b044 SE |
748 | MODULE_AUTHOR(BATADV_DRIVER_AUTHOR); |
749 | MODULE_DESCRIPTION(BATADV_DRIVER_DESC); | |
750 | MODULE_SUPPORTED_DEVICE(BATADV_DRIVER_DEVICE); | |
751 | MODULE_VERSION(BATADV_SOURCE_VERSION); | |
9791860c | 752 | MODULE_ALIAS_RTNL_LINK("batadv"); |
2c0c06ff | 753 | MODULE_ALIAS_GENL_FAMILY(BATADV_NL_NAME); |