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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> |
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 | 25 | #include <linux/list.h> |
fcd193e1 | 26 | #include <linux/minmax.h> |
1e2c2a4f | 27 | #include <linux/module.h> |
1e2c2a4f | 28 | #include <linux/netdevice.h> |
ba412080 | 29 | #include <linux/printk.h> |
1e2c2a4f SE |
30 | #include <linux/rculist.h> |
31 | #include <linux/rcupdate.h> | |
1e2c2a4f | 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" |
1e2c2a4f SE |
47 | #include "distributed-arp-table.h" |
48 | #include "gateway_client.h" | |
49 | #include "gateway_common.h" | |
50 | #include "hard-interface.h" | |
ba412080 | 51 | #include "log.h" |
1e2c2a4f | 52 | #include "multicast.h" |
09748a22 | 53 | #include "netlink.h" |
1e2c2a4f SE |
54 | #include "network-coding.h" |
55 | #include "originator.h" | |
c6c8fea2 SE |
56 | #include "routing.h" |
57 | #include "send.h" | |
c6c8fea2 | 58 | #include "soft-interface.h" |
33a3bb4a | 59 | #include "tp_meter.h" |
c6c8fea2 | 60 | #include "translation-table.h" |
c6c8fea2 | 61 | |
c3caf519 | 62 | /* List manipulations on hardif_list have to be rtnl_lock()'ed, |
9cfc7bd6 SE |
63 | * list traversals just rcu-locked |
64 | */ | |
3193e8fd | 65 | struct list_head batadv_hardif_list; |
fb69be69 | 66 | unsigned int batadv_hardif_generation; |
706cc9f5 SE |
67 | static int (*batadv_rx_handler[256])(struct sk_buff *skb, |
68 | struct batadv_hard_iface *recv_if); | |
c6c8fea2 | 69 | |
3193e8fd | 70 | unsigned char batadv_broadcast_addr[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; |
c6c8fea2 | 71 | |
3193e8fd | 72 | struct workqueue_struct *batadv_event_workqueue; |
c6c8fea2 | 73 | |
ee11ad61 | 74 | static void batadv_recv_handler_init(void); |
ffa995e0 | 75 | |
0fa4c30d SE |
76 | #define BATADV_UEV_TYPE_VAR "BATTYPE=" |
77 | #define BATADV_UEV_ACTION_VAR "BATACTION=" | |
78 | #define BATADV_UEV_DATA_VAR "BATDATA=" | |
79 | ||
80 | static char *batadv_uev_action_str[] = { | |
81 | "add", | |
82 | "del", | |
83 | "change", | |
84 | "loopdetect", | |
85 | }; | |
86 | ||
87 | static char *batadv_uev_type_str[] = { | |
88 | "gw", | |
89 | "bla", | |
90 | }; | |
91 | ||
ee11ad61 | 92 | static int __init batadv_init(void) |
c6c8fea2 | 93 | { |
86452f81 SE |
94 | int ret; |
95 | ||
96 | ret = batadv_tt_cache_init(); | |
97 | if (ret < 0) | |
98 | return ret; | |
99 | ||
3193e8fd | 100 | INIT_LIST_HEAD(&batadv_hardif_list); |
01d350d1 | 101 | batadv_algo_init(); |
1c280471 | 102 | |
ee11ad61 | 103 | batadv_recv_handler_init(); |
ffa995e0 | 104 | |
d6f94d91 | 105 | batadv_v_init(); |
81c524f7 | 106 | batadv_iv_init(); |
6c519bad | 107 | batadv_nc_init(); |
33a3bb4a | 108 | batadv_tp_meter_init(); |
c6c8fea2 | 109 | |
3193e8fd | 110 | batadv_event_workqueue = create_singlethread_workqueue("bat_events"); |
3193e8fd | 111 | if (!batadv_event_workqueue) |
86452f81 | 112 | goto err_create_wq; |
c6c8fea2 | 113 | |
9563877e | 114 | register_netdevice_notifier(&batadv_hard_if_notifier); |
a4ac28c0 | 115 | rtnl_link_register(&batadv_link_ops); |
09748a22 | 116 | batadv_netlink_register(); |
c6c8fea2 | 117 | |
86ceb360 | 118 | pr_info("B.A.T.M.A.N. advanced %s (compatibility version %i) loaded\n", |
42d0b044 | 119 | BATADV_SOURCE_VERSION, BATADV_COMPAT_VERSION); |
c6c8fea2 SE |
120 | |
121 | return 0; | |
86452f81 SE |
122 | |
123 | err_create_wq: | |
124 | batadv_tt_cache_destroy(); | |
125 | ||
126 | return -ENOMEM; | |
c6c8fea2 SE |
127 | } |
128 | ||
ee11ad61 | 129 | static void __exit batadv_exit(void) |
c6c8fea2 | 130 | { |
09748a22 | 131 | batadv_netlink_unregister(); |
a4ac28c0 | 132 | rtnl_link_unregister(&batadv_link_ops); |
9563877e | 133 | unregister_netdevice_notifier(&batadv_hard_if_notifier); |
c6c8fea2 | 134 | |
3193e8fd SE |
135 | flush_workqueue(batadv_event_workqueue); |
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 | ||
0da00359 AQ |
193 | ret = batadv_v_mesh_init(bat_priv); |
194 | if (ret < 0) | |
195 | goto err; | |
196 | ||
7d211efc | 197 | ret = batadv_originator_init(bat_priv); |
5346c35e | 198 | if (ret < 0) |
c6c8fea2 SE |
199 | goto err; |
200 | ||
08c36d3e | 201 | ret = batadv_tt_init(bat_priv); |
5346c35e | 202 | if (ret < 0) |
c6c8fea2 SE |
203 | goto err; |
204 | ||
08adf151 | 205 | ret = batadv_bla_init(bat_priv); |
5346c35e | 206 | if (ret < 0) |
23721387 SW |
207 | goto err; |
208 | ||
2f1dfbe1 AQ |
209 | ret = batadv_dat_init(bat_priv); |
210 | if (ret < 0) | |
211 | goto err; | |
212 | ||
6c519bad | 213 | ret = batadv_nc_mesh_init(bat_priv); |
d353d8d4 MH |
214 | if (ret < 0) |
215 | goto err; | |
216 | ||
414254e3 | 217 | batadv_gw_init(bat_priv); |
60432d75 | 218 | batadv_mcast_init(bat_priv); |
414254e3 | 219 | |
807736f6 | 220 | atomic_set(&bat_priv->gw.reselect, 0); |
39c75a51 | 221 | atomic_set(&bat_priv->mesh_state, BATADV_MESH_ACTIVE); |
5346c35e SE |
222 | |
223 | return 0; | |
c6c8fea2 SE |
224 | |
225 | err: | |
3193e8fd | 226 | batadv_mesh_free(soft_iface); |
5346c35e | 227 | return ret; |
c6c8fea2 SE |
228 | } |
229 | ||
ff15c27c SE |
230 | /** |
231 | * batadv_mesh_free() - Deinitialize soft interface | |
232 | * @soft_iface: netdev struct of the soft interface | |
233 | */ | |
3193e8fd | 234 | void batadv_mesh_free(struct net_device *soft_iface) |
c6c8fea2 | 235 | { |
56303d34 | 236 | struct batadv_priv *bat_priv = netdev_priv(soft_iface); |
c6c8fea2 | 237 | |
39c75a51 | 238 | atomic_set(&bat_priv->mesh_state, BATADV_MESH_DEACTIVATING); |
c6c8fea2 | 239 | |
9455e34c | 240 | batadv_purge_outstanding_packets(bat_priv, NULL); |
c6c8fea2 | 241 | |
bd3524c1 | 242 | batadv_gw_node_free(bat_priv); |
0da00359 AQ |
243 | |
244 | batadv_v_mesh_free(bat_priv); | |
6c519bad | 245 | batadv_nc_mesh_free(bat_priv); |
a4361860 AQ |
246 | batadv_dat_free(bat_priv); |
247 | batadv_bla_free(bat_priv); | |
c6c8fea2 | 248 | |
c5caf4ef LL |
249 | batadv_mcast_free(bat_priv); |
250 | ||
a4361860 AQ |
251 | /* Free the TT and the originator tables only after having terminated |
252 | * all the other depending components which may use these structures for | |
253 | * their purposes. | |
254 | */ | |
08c36d3e | 255 | batadv_tt_free(bat_priv); |
c6c8fea2 | 256 | |
a4361860 AQ |
257 | /* Since the originator table clean up routine is accessing the TT |
258 | * tables as well, it has to be invoked after the TT tables have been | |
259 | * freed and marked as empty. This ensures that no cleanup RCU callbacks | |
260 | * accessing the TT data are scheduled for later execution. | |
261 | */ | |
262 | batadv_originator_free(bat_priv); | |
2f1dfbe1 | 263 | |
414254e3 ML |
264 | batadv_gw_free(bat_priv); |
265 | ||
f8214865 | 266 | free_percpu(bat_priv->bat_counters); |
f69ae770 | 267 | bat_priv->bat_counters = NULL; |
f8214865 | 268 | |
39c75a51 | 269 | atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE); |
c6c8fea2 SE |
270 | } |
271 | ||
6e0895c2 | 272 | /** |
7e9a8c2c SE |
273 | * batadv_is_my_mac() - check if the given mac address belongs to any of the |
274 | * real interfaces in the current mesh | |
6e0895c2 DM |
275 | * @bat_priv: the bat priv with all the soft interface information |
276 | * @addr: the address to check | |
e8ad3b1a | 277 | * |
62fe710f | 278 | * Return: 'true' if the mac address was found, false otherwise. |
6e0895c2 | 279 | */ |
6b5e971a | 280 | bool batadv_is_my_mac(struct batadv_priv *bat_priv, const u8 *addr) |
c6c8fea2 | 281 | { |
56303d34 | 282 | const struct batadv_hard_iface *hard_iface; |
e8ad3b1a | 283 | bool is_my_mac = false; |
c6c8fea2 SE |
284 | |
285 | rcu_read_lock(); | |
3193e8fd | 286 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e9a4f295 | 287 | if (hard_iface->if_status != BATADV_IF_ACTIVE) |
c6c8fea2 SE |
288 | continue; |
289 | ||
fe8a93b9 AQ |
290 | if (hard_iface->soft_iface != bat_priv->soft_iface) |
291 | continue; | |
292 | ||
1eda58bf | 293 | if (batadv_compare_eth(hard_iface->net_dev->dev_addr, addr)) { |
e8ad3b1a MP |
294 | is_my_mac = true; |
295 | break; | |
c6c8fea2 SE |
296 | } |
297 | } | |
298 | rcu_read_unlock(); | |
e8ad3b1a | 299 | return is_my_mac; |
c6c8fea2 SE |
300 | } |
301 | ||
411d6ed9 | 302 | /** |
7e9a8c2c | 303 | * batadv_max_header_len() - calculate maximum encapsulation overhead for a |
411d6ed9 ML |
304 | * payload packet |
305 | * | |
62fe710f | 306 | * Return: the maximum encapsulation overhead in bytes. |
411d6ed9 ML |
307 | */ |
308 | int batadv_max_header_len(void) | |
309 | { | |
310 | int header_len = 0; | |
311 | ||
312 | header_len = max_t(int, header_len, | |
313 | sizeof(struct batadv_unicast_packet)); | |
314 | header_len = max_t(int, header_len, | |
315 | sizeof(struct batadv_unicast_4addr_packet)); | |
316 | header_len = max_t(int, header_len, | |
317 | sizeof(struct batadv_bcast_packet)); | |
318 | ||
319 | #ifdef CONFIG_BATMAN_ADV_NC | |
320 | header_len = max_t(int, header_len, | |
321 | sizeof(struct batadv_coded_packet)); | |
322 | #endif | |
323 | ||
1df0cbd5 | 324 | return header_len + ETH_HLEN; |
411d6ed9 ML |
325 | } |
326 | ||
c54f38c9 | 327 | /** |
7e9a8c2c | 328 | * batadv_skb_set_priority() - sets skb priority according to packet content |
c54f38c9 SW |
329 | * @skb: the packet to be sent |
330 | * @offset: offset to the packet content | |
331 | * | |
332 | * This function sets a value between 256 and 263 (802.1d priority), which | |
333 | * can be interpreted by the cfg80211 or other drivers. | |
334 | */ | |
335 | void batadv_skb_set_priority(struct sk_buff *skb, int offset) | |
336 | { | |
337 | struct iphdr ip_hdr_tmp, *ip_hdr; | |
338 | struct ipv6hdr ip6_hdr_tmp, *ip6_hdr; | |
339 | struct ethhdr ethhdr_tmp, *ethhdr; | |
340 | struct vlan_ethhdr *vhdr, vhdr_tmp; | |
341 | u32 prio; | |
342 | ||
343 | /* already set, do nothing */ | |
344 | if (skb->priority >= 256 && skb->priority <= 263) | |
345 | return; | |
346 | ||
347 | ethhdr = skb_header_pointer(skb, offset, sizeof(*ethhdr), ðhdr_tmp); | |
348 | if (!ethhdr) | |
349 | return; | |
350 | ||
351 | switch (ethhdr->h_proto) { | |
352 | case htons(ETH_P_8021Q): | |
353 | vhdr = skb_header_pointer(skb, offset + sizeof(*vhdr), | |
354 | sizeof(*vhdr), &vhdr_tmp); | |
355 | if (!vhdr) | |
356 | return; | |
357 | prio = ntohs(vhdr->h_vlan_TCI) & VLAN_PRIO_MASK; | |
358 | prio = prio >> VLAN_PRIO_SHIFT; | |
359 | break; | |
360 | case htons(ETH_P_IP): | |
361 | ip_hdr = skb_header_pointer(skb, offset + sizeof(*ethhdr), | |
362 | sizeof(*ip_hdr), &ip_hdr_tmp); | |
363 | if (!ip_hdr) | |
364 | return; | |
365 | prio = (ipv4_get_dsfield(ip_hdr) & 0xfc) >> 5; | |
366 | break; | |
367 | case htons(ETH_P_IPV6): | |
368 | ip6_hdr = skb_header_pointer(skb, offset + sizeof(*ethhdr), | |
369 | sizeof(*ip6_hdr), &ip6_hdr_tmp); | |
370 | if (!ip6_hdr) | |
371 | return; | |
372 | prio = (ipv6_get_dsfield(ip6_hdr) & 0xfc) >> 5; | |
373 | break; | |
374 | default: | |
375 | return; | |
376 | } | |
377 | ||
378 | skb->priority = prio + 256; | |
379 | } | |
380 | ||
ee11ad61 | 381 | static int batadv_recv_unhandled_packet(struct sk_buff *skb, |
56303d34 | 382 | struct batadv_hard_iface *recv_if) |
ffa995e0 | 383 | { |
b91a2543 SE |
384 | kfree_skb(skb); |
385 | ||
ffa995e0 ML |
386 | return NET_RX_DROP; |
387 | } | |
388 | ||
389 | /* incoming packets with the batman ethertype received on any active hard | |
390 | * interface | |
391 | */ | |
ff15c27c SE |
392 | |
393 | /** | |
394 | * batadv_batman_skb_recv() - Handle incoming message from an hard interface | |
395 | * @skb: the received packet | |
396 | * @dev: the net device that the packet was received on | |
397 | * @ptype: packet type of incoming packet (ETH_P_BATMAN) | |
398 | * @orig_dev: the original receive net device (e.g. bonded device) | |
399 | * | |
400 | * Return: NET_RX_SUCCESS on success or NET_RX_DROP in case of failure | |
401 | */ | |
3193e8fd SE |
402 | int batadv_batman_skb_recv(struct sk_buff *skb, struct net_device *dev, |
403 | struct packet_type *ptype, | |
404 | struct net_device *orig_dev) | |
ffa995e0 | 405 | { |
56303d34 | 406 | struct batadv_priv *bat_priv; |
96412690 | 407 | struct batadv_ogm_packet *batadv_ogm_packet; |
56303d34 | 408 | struct batadv_hard_iface *hard_iface; |
6b5e971a | 409 | u8 idx; |
ffa995e0 | 410 | |
56303d34 SE |
411 | hard_iface = container_of(ptype, struct batadv_hard_iface, |
412 | batman_adv_ptype); | |
4fe56e60 SE |
413 | |
414 | /* Prevent processing a packet received on an interface which is getting | |
415 | * shut down otherwise the packet may trigger de-reference errors | |
416 | * further down in the receive path. | |
417 | */ | |
418 | if (!kref_get_unless_zero(&hard_iface->refcount)) | |
419 | goto err_out; | |
420 | ||
ffa995e0 ML |
421 | skb = skb_share_check(skb, GFP_ATOMIC); |
422 | ||
423 | /* skb was released by skb_share_check() */ | |
424 | if (!skb) | |
4fe56e60 | 425 | goto err_put; |
ffa995e0 ML |
426 | |
427 | /* packet should hold at least type and version */ | |
428 | if (unlikely(!pskb_may_pull(skb, 2))) | |
429 | goto err_free; | |
430 | ||
431 | /* expect a valid ethernet header here. */ | |
432 | if (unlikely(skb->mac_len != ETH_HLEN || !skb_mac_header(skb))) | |
433 | goto err_free; | |
434 | ||
435 | if (!hard_iface->soft_iface) | |
436 | goto err_free; | |
437 | ||
438 | bat_priv = netdev_priv(hard_iface->soft_iface); | |
439 | ||
39c75a51 | 440 | if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) |
ffa995e0 ML |
441 | goto err_free; |
442 | ||
443 | /* discard frames on not active interfaces */ | |
e9a4f295 | 444 | if (hard_iface->if_status != BATADV_IF_ACTIVE) |
ffa995e0 ML |
445 | goto err_free; |
446 | ||
96412690 | 447 | batadv_ogm_packet = (struct batadv_ogm_packet *)skb->data; |
ffa995e0 | 448 | |
a40d9b07 | 449 | if (batadv_ogm_packet->version != BATADV_COMPAT_VERSION) { |
39c75a51 | 450 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 451 | "Drop packet: incompatible batman version (%i)\n", |
a40d9b07 | 452 | batadv_ogm_packet->version); |
ffa995e0 ML |
453 | goto err_free; |
454 | } | |
455 | ||
e0d9677e MH |
456 | /* reset control block to avoid left overs from previous users */ |
457 | memset(skb->cb, 0, sizeof(struct batadv_skb_cb)); | |
458 | ||
a40d9b07 | 459 | idx = batadv_ogm_packet->packet_type; |
b91a2543 | 460 | (*batadv_rx_handler[idx])(skb, hard_iface); |
ffa995e0 | 461 | |
4fe56e60 SE |
462 | batadv_hardif_put(hard_iface); |
463 | ||
ffa995e0 ML |
464 | /* return NET_RX_SUCCESS in any case as we |
465 | * most probably dropped the packet for | |
466 | * routing-logical reasons. | |
467 | */ | |
468 | return NET_RX_SUCCESS; | |
469 | ||
470 | err_free: | |
471 | kfree_skb(skb); | |
4fe56e60 SE |
472 | err_put: |
473 | batadv_hardif_put(hard_iface); | |
ffa995e0 ML |
474 | err_out: |
475 | return NET_RX_DROP; | |
476 | } | |
477 | ||
ee11ad61 | 478 | static void batadv_recv_handler_init(void) |
ffa995e0 ML |
479 | { |
480 | int i; | |
481 | ||
ee11ad61 SE |
482 | for (i = 0; i < ARRAY_SIZE(batadv_rx_handler); i++) |
483 | batadv_rx_handler[i] = batadv_recv_unhandled_packet; | |
ffa995e0 | 484 | |
a1f1ac5c SW |
485 | for (i = BATADV_UNICAST_MIN; i <= BATADV_UNICAST_MAX; i++) |
486 | batadv_rx_handler[i] = batadv_recv_unhandled_unicast_packet; | |
487 | ||
031ace8d SW |
488 | /* compile time checks for sizes */ |
489 | BUILD_BUG_ON(sizeof(struct batadv_bla_claim_dst) != 6); | |
490 | BUILD_BUG_ON(sizeof(struct batadv_ogm_packet) != 24); | |
491 | BUILD_BUG_ON(sizeof(struct batadv_icmp_header) != 20); | |
492 | BUILD_BUG_ON(sizeof(struct batadv_icmp_packet) != 20); | |
493 | BUILD_BUG_ON(sizeof(struct batadv_icmp_packet_rr) != 116); | |
494 | BUILD_BUG_ON(sizeof(struct batadv_unicast_packet) != 10); | |
495 | BUILD_BUG_ON(sizeof(struct batadv_unicast_4addr_packet) != 18); | |
496 | BUILD_BUG_ON(sizeof(struct batadv_frag_packet) != 20); | |
497 | BUILD_BUG_ON(sizeof(struct batadv_bcast_packet) != 14); | |
498 | BUILD_BUG_ON(sizeof(struct batadv_coded_packet) != 46); | |
499 | BUILD_BUG_ON(sizeof(struct batadv_unicast_tvlv_packet) != 20); | |
500 | BUILD_BUG_ON(sizeof(struct batadv_tvlv_hdr) != 4); | |
501 | BUILD_BUG_ON(sizeof(struct batadv_tvlv_gateway_data) != 8); | |
502 | BUILD_BUG_ON(sizeof(struct batadv_tvlv_tt_vlan_data) != 8); | |
503 | BUILD_BUG_ON(sizeof(struct batadv_tvlv_tt_change) != 12); | |
504 | BUILD_BUG_ON(sizeof(struct batadv_tvlv_roam_adv) != 8); | |
80067c83 | 505 | |
c593642c | 506 | i = sizeof_field(struct sk_buff, cb); |
e2d9ba43 LL |
507 | BUILD_BUG_ON(sizeof(struct batadv_skb_cb) > i); |
508 | ||
a1f1ac5c SW |
509 | /* broadcast packet */ |
510 | batadv_rx_handler[BATADV_BCAST] = batadv_recv_bcast_packet; | |
511 | ||
512 | /* unicast packets ... */ | |
7cdcf6dd AQ |
513 | /* unicast with 4 addresses packet */ |
514 | batadv_rx_handler[BATADV_UNICAST_4ADDR] = batadv_recv_unicast_packet; | |
ffa995e0 | 515 | /* unicast packet */ |
acd34afa | 516 | batadv_rx_handler[BATADV_UNICAST] = batadv_recv_unicast_packet; |
ef261577 ML |
517 | /* unicast tvlv packet */ |
518 | batadv_rx_handler[BATADV_UNICAST_TVLV] = batadv_recv_unicast_tvlv; | |
a1f1ac5c SW |
519 | /* batman icmp packet */ |
520 | batadv_rx_handler[BATADV_ICMP] = batadv_recv_icmp_packet; | |
610bfc6b MH |
521 | /* Fragmented packets */ |
522 | batadv_rx_handler[BATADV_UNICAST_FRAG] = batadv_recv_frag_packet; | |
ffa995e0 ML |
523 | } |
524 | ||
ff15c27c SE |
525 | /** |
526 | * batadv_recv_handler_register() - Register handler for batman-adv packet type | |
527 | * @packet_type: batadv_packettype which should be handled | |
528 | * @recv_handler: receive handler for the packet type | |
529 | * | |
530 | * Return: 0 on success or negative error number in case of failure | |
531 | */ | |
56303d34 | 532 | int |
6b5e971a | 533 | batadv_recv_handler_register(u8 packet_type, |
56303d34 SE |
534 | int (*recv_handler)(struct sk_buff *, |
535 | struct batadv_hard_iface *)) | |
ffa995e0 | 536 | { |
706cc9f5 SE |
537 | int (*curr)(struct sk_buff *skb, |
538 | struct batadv_hard_iface *recv_if); | |
a1f1ac5c SW |
539 | curr = batadv_rx_handler[packet_type]; |
540 | ||
825ffe1f SE |
541 | if (curr != batadv_recv_unhandled_packet && |
542 | curr != batadv_recv_unhandled_unicast_packet) | |
ffa995e0 ML |
543 | return -EBUSY; |
544 | ||
ee11ad61 | 545 | batadv_rx_handler[packet_type] = recv_handler; |
ffa995e0 ML |
546 | return 0; |
547 | } | |
548 | ||
ff15c27c SE |
549 | /** |
550 | * batadv_recv_handler_unregister() - Unregister handler for packet type | |
551 | * @packet_type: batadv_packettype which should no longer be handled | |
552 | */ | |
6b5e971a | 553 | void batadv_recv_handler_unregister(u8 packet_type) |
ffa995e0 | 554 | { |
ee11ad61 | 555 | batadv_rx_handler[packet_type] = batadv_recv_unhandled_packet; |
ffa995e0 ML |
556 | } |
557 | ||
95a066d8 | 558 | /** |
7e9a8c2c | 559 | * batadv_skb_crc32() - calculate CRC32 of the whole packet and skip bytes in |
95a066d8 SE |
560 | * the header |
561 | * @skb: skb pointing to fragmented socket buffers | |
562 | * @payload_ptr: Pointer to position inside the head buffer of the skb | |
563 | * marking the start of the data to be CRC'ed | |
564 | * | |
565 | * payload_ptr must always point to an address in the skb head buffer and not to | |
566 | * a fragment. | |
7afcbbef SE |
567 | * |
568 | * Return: big endian crc32c of the checksummed data | |
95a066d8 SE |
569 | */ |
570 | __be32 batadv_skb_crc32(struct sk_buff *skb, u8 *payload_ptr) | |
571 | { | |
572 | u32 crc = 0; | |
573 | unsigned int from; | |
574 | unsigned int to = skb->len; | |
575 | struct skb_seq_state st; | |
576 | const u8 *data; | |
577 | unsigned int len; | |
578 | unsigned int consumed = 0; | |
579 | ||
580 | from = (unsigned int)(payload_ptr - skb->data); | |
581 | ||
582 | skb_prepare_seq_read(skb, from, to, &st); | |
583 | while ((len = skb_seq_read(consumed, &data, &st)) != 0) { | |
584 | crc = crc32c(crc, data, len); | |
585 | consumed += len; | |
586 | } | |
95a066d8 SE |
587 | |
588 | return htonl(crc); | |
589 | } | |
590 | ||
c018ad3d | 591 | /** |
7e9a8c2c | 592 | * batadv_get_vid() - extract the VLAN identifier from skb if any |
c018ad3d AQ |
593 | * @skb: the buffer containing the packet |
594 | * @header_len: length of the batman header preceding the ethernet header | |
595 | * | |
62fe710f SE |
596 | * Return: VID with the BATADV_VLAN_HAS_TAG flag when the packet embedded in the |
597 | * skb is vlan tagged. Otherwise BATADV_NO_FLAGS. | |
c018ad3d AQ |
598 | */ |
599 | unsigned short batadv_get_vid(struct sk_buff *skb, size_t header_len) | |
600 | { | |
601 | struct ethhdr *ethhdr = (struct ethhdr *)(skb->data + header_len); | |
602 | struct vlan_ethhdr *vhdr; | |
603 | unsigned short vid; | |
604 | ||
605 | if (ethhdr->h_proto != htons(ETH_P_8021Q)) | |
606 | return BATADV_NO_FLAGS; | |
607 | ||
608 | if (!pskb_may_pull(skb, header_len + VLAN_ETH_HLEN)) | |
609 | return BATADV_NO_FLAGS; | |
610 | ||
611 | vhdr = (struct vlan_ethhdr *)(skb->data + header_len); | |
612 | vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK; | |
613 | vid |= BATADV_VLAN_HAS_TAG; | |
614 | ||
615 | return vid; | |
616 | } | |
617 | ||
eceb22ae | 618 | /** |
7e9a8c2c | 619 | * batadv_vlan_ap_isola_get() - return AP isolation status for the given vlan |
eceb22ae AQ |
620 | * @bat_priv: the bat priv with all the soft interface information |
621 | * @vid: the VLAN identifier for which the AP isolation attributed as to be | |
622 | * looked up | |
623 | * | |
bccb48c8 | 624 | * Return: true if AP isolation is on for the VLAN identified by vid, false |
eceb22ae AQ |
625 | * otherwise |
626 | */ | |
627 | bool batadv_vlan_ap_isola_get(struct batadv_priv *bat_priv, unsigned short vid) | |
628 | { | |
629 | bool ap_isolation_enabled = false; | |
630 | struct batadv_softif_vlan *vlan; | |
631 | ||
632 | /* if the AP isolation is requested on a VLAN, then check for its | |
633 | * setting in the proper VLAN private data structure | |
634 | */ | |
635 | vlan = batadv_softif_vlan_get(bat_priv, vid); | |
636 | if (vlan) { | |
637 | ap_isolation_enabled = atomic_read(&vlan->ap_isolation); | |
9c3bf081 | 638 | batadv_softif_vlan_put(vlan); |
eceb22ae AQ |
639 | } |
640 | ||
641 | return ap_isolation_enabled; | |
642 | } | |
643 | ||
0fa4c30d SE |
644 | /** |
645 | * batadv_throw_uevent() - Send an uevent with batman-adv specific env data | |
646 | * @bat_priv: the bat priv with all the soft interface information | |
647 | * @type: subsystem type of event. Stored in uevent's BATTYPE | |
648 | * @action: action type of event. Stored in uevent's BATACTION | |
649 | * @data: string with additional information to the event (ignored for | |
650 | * BATADV_UEV_DEL). Stored in uevent's BATDATA | |
651 | * | |
652 | * Return: 0 on success or negative error number in case of failure | |
653 | */ | |
654 | int batadv_throw_uevent(struct batadv_priv *bat_priv, enum batadv_uev_type type, | |
655 | enum batadv_uev_action action, const char *data) | |
656 | { | |
657 | int ret = -ENOMEM; | |
658 | struct kobject *bat_kobj; | |
659 | char *uevent_env[4] = { NULL, NULL, NULL, NULL }; | |
660 | ||
661 | bat_kobj = &bat_priv->soft_iface->dev.kobj; | |
662 | ||
663 | uevent_env[0] = kasprintf(GFP_ATOMIC, | |
664 | "%s%s", BATADV_UEV_TYPE_VAR, | |
665 | batadv_uev_type_str[type]); | |
666 | if (!uevent_env[0]) | |
667 | goto out; | |
668 | ||
669 | uevent_env[1] = kasprintf(GFP_ATOMIC, | |
670 | "%s%s", BATADV_UEV_ACTION_VAR, | |
671 | batadv_uev_action_str[action]); | |
672 | if (!uevent_env[1]) | |
673 | goto out; | |
674 | ||
675 | /* If the event is DEL, ignore the data field */ | |
676 | if (action != BATADV_UEV_DEL) { | |
677 | uevent_env[2] = kasprintf(GFP_ATOMIC, | |
678 | "%s%s", BATADV_UEV_DATA_VAR, data); | |
679 | if (!uevent_env[2]) | |
680 | goto out; | |
681 | } | |
682 | ||
683 | ret = kobject_uevent_env(bat_kobj, KOBJ_CHANGE, uevent_env); | |
684 | out: | |
685 | kfree(uevent_env[0]); | |
686 | kfree(uevent_env[1]); | |
687 | kfree(uevent_env[2]); | |
688 | ||
689 | if (ret) | |
690 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
691 | "Impossible to send uevent for (%s,%s,%s) event (err: %d)\n", | |
692 | batadv_uev_type_str[type], | |
693 | batadv_uev_action_str[action], | |
694 | (action == BATADV_UEV_DEL ? "NULL" : data), ret); | |
695 | return ret; | |
696 | } | |
697 | ||
ee11ad61 SE |
698 | module_init(batadv_init); |
699 | module_exit(batadv_exit); | |
c6c8fea2 SE |
700 | |
701 | MODULE_LICENSE("GPL"); | |
702 | ||
42d0b044 SE |
703 | MODULE_AUTHOR(BATADV_DRIVER_AUTHOR); |
704 | MODULE_DESCRIPTION(BATADV_DRIVER_DESC); | |
42d0b044 | 705 | MODULE_VERSION(BATADV_SOURCE_VERSION); |
9791860c | 706 | MODULE_ALIAS_RTNL_LINK("batadv"); |
2c0c06ff | 707 | MODULE_ALIAS_GENL_FAMILY(BATADV_NL_NAME); |