1 /* Copyright (C) 2007-2012 B.A.T.M.A.N. contributors:
3 * Marek Lindner, Simon Wunderlich
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of version 2 of the GNU General Public
7 * License as published by the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
21 #include "soft-interface.h"
22 #include "hard-interface.h"
23 #include "distributed-arp-table.h"
27 #include "translation-table.h"
29 #include "gateway_common.h"
30 #include "gateway_client.h"
32 #include "originator.h"
33 #include <linux/slab.h>
34 #include <linux/ethtool.h>
35 #include <linux/etherdevice.h>
36 #include <linux/if_vlan.h>
38 #include "bridge_loop_avoidance.h"
41 static int batadv_get_settings(struct net_device
*dev
, struct ethtool_cmd
*cmd
);
42 static void batadv_get_drvinfo(struct net_device
*dev
,
43 struct ethtool_drvinfo
*info
);
44 static u32
batadv_get_msglevel(struct net_device
*dev
);
45 static void batadv_set_msglevel(struct net_device
*dev
, u32 value
);
46 static u32
batadv_get_link(struct net_device
*dev
);
47 static void batadv_get_strings(struct net_device
*dev
, u32 stringset
, u8
*data
);
48 static void batadv_get_ethtool_stats(struct net_device
*dev
,
49 struct ethtool_stats
*stats
, u64
*data
);
50 static int batadv_get_sset_count(struct net_device
*dev
, int stringset
);
52 static const struct ethtool_ops batadv_ethtool_ops
= {
53 .get_settings
= batadv_get_settings
,
54 .get_drvinfo
= batadv_get_drvinfo
,
55 .get_msglevel
= batadv_get_msglevel
,
56 .set_msglevel
= batadv_set_msglevel
,
57 .get_link
= batadv_get_link
,
58 .get_strings
= batadv_get_strings
,
59 .get_ethtool_stats
= batadv_get_ethtool_stats
,
60 .get_sset_count
= batadv_get_sset_count
,
63 int batadv_skb_head_push(struct sk_buff
*skb
, unsigned int len
)
67 /* TODO: We must check if we can release all references to non-payload
68 * data using skb_header_release in our skbs to allow skb_cow_header to
69 * work optimally. This means that those skbs are not allowed to read
70 * or write any data which is before the current position of skb->data
71 * after that call and thus allow other skbs with the same data buffer
72 * to write freely in that area.
74 result
= skb_cow_head(skb
, len
);
82 static int batadv_interface_open(struct net_device
*dev
)
84 netif_start_queue(dev
);
88 static int batadv_interface_release(struct net_device
*dev
)
90 netif_stop_queue(dev
);
94 static struct net_device_stats
*batadv_interface_stats(struct net_device
*dev
)
96 struct batadv_priv
*bat_priv
= netdev_priv(dev
);
97 struct net_device_stats
*stats
= &bat_priv
->stats
;
99 stats
->tx_packets
= batadv_sum_counter(bat_priv
, BATADV_CNT_TX
);
100 stats
->tx_bytes
= batadv_sum_counter(bat_priv
, BATADV_CNT_TX_BYTES
);
101 stats
->tx_dropped
= batadv_sum_counter(bat_priv
, BATADV_CNT_TX_DROPPED
);
102 stats
->rx_packets
= batadv_sum_counter(bat_priv
, BATADV_CNT_RX
);
103 stats
->rx_bytes
= batadv_sum_counter(bat_priv
, BATADV_CNT_RX_BYTES
);
107 static int batadv_interface_set_mac_addr(struct net_device
*dev
, void *p
)
109 struct batadv_priv
*bat_priv
= netdev_priv(dev
);
110 struct sockaddr
*addr
= p
;
111 uint8_t old_addr
[ETH_ALEN
];
113 if (!is_valid_ether_addr(addr
->sa_data
))
114 return -EADDRNOTAVAIL
;
116 memcpy(old_addr
, dev
->dev_addr
, ETH_ALEN
);
117 memcpy(dev
->dev_addr
, addr
->sa_data
, ETH_ALEN
);
119 /* only modify transtable if it has been initialized before */
120 if (atomic_read(&bat_priv
->mesh_state
) == BATADV_MESH_ACTIVE
) {
121 batadv_tt_local_remove(bat_priv
, old_addr
,
122 "mac address changed", false);
123 batadv_tt_local_add(dev
, addr
->sa_data
, BATADV_NULL_IFINDEX
);
126 dev
->addr_assign_type
&= ~NET_ADDR_RANDOM
;
130 static int batadv_interface_change_mtu(struct net_device
*dev
, int new_mtu
)
133 if ((new_mtu
< 68) || (new_mtu
> batadv_hardif_min_mtu(dev
)))
141 static int batadv_interface_tx(struct sk_buff
*skb
,
142 struct net_device
*soft_iface
)
144 struct ethhdr
*ethhdr
= (struct ethhdr
*)skb
->data
;
145 struct batadv_priv
*bat_priv
= netdev_priv(soft_iface
);
146 struct batadv_hard_iface
*primary_if
= NULL
;
147 struct batadv_bcast_packet
*bcast_packet
;
148 struct vlan_ethhdr
*vhdr
;
149 __be16 ethertype
= __constant_htons(BATADV_ETH_P_BATMAN
);
150 static const uint8_t stp_addr
[ETH_ALEN
] = {0x01, 0x80, 0xC2, 0x00,
152 static const uint8_t ectp_addr
[ETH_ALEN
] = {0xCF, 0x00, 0x00, 0x00,
154 unsigned int header_len
= 0;
155 int data_len
= skb
->len
, ret
;
156 short vid __maybe_unused
= -1;
157 bool do_bcast
= false;
159 unsigned long brd_delay
= 1;
161 if (atomic_read(&bat_priv
->mesh_state
) != BATADV_MESH_ACTIVE
)
164 soft_iface
->trans_start
= jiffies
;
166 switch (ntohs(ethhdr
->h_proto
)) {
168 vhdr
= (struct vlan_ethhdr
*)skb
->data
;
169 vid
= ntohs(vhdr
->h_vlan_TCI
) & VLAN_VID_MASK
;
171 if (vhdr
->h_vlan_encapsulated_proto
!= ethertype
)
175 case BATADV_ETH_P_BATMAN
:
179 if (batadv_bla_tx(bat_priv
, skb
, vid
))
182 /* Register the client MAC in the transtable */
183 batadv_tt_local_add(soft_iface
, ethhdr
->h_source
, skb
->skb_iif
);
185 /* don't accept stp packets. STP does not help in meshes.
186 * better use the bridge loop avoidance ...
188 * The same goes for ECTP sent at least by some Cisco Switches,
189 * it might confuse the mesh when used with bridge loop avoidance.
191 if (batadv_compare_eth(ethhdr
->h_dest
, stp_addr
))
194 if (batadv_compare_eth(ethhdr
->h_dest
, ectp_addr
))
197 if (is_multicast_ether_addr(ethhdr
->h_dest
)) {
200 switch (atomic_read(&bat_priv
->gw_mode
)) {
201 case BATADV_GW_MODE_SERVER
:
202 /* gateway servers should not send dhcp
203 * requests into the mesh
205 ret
= batadv_gw_is_dhcp_target(skb
, &header_len
);
209 case BATADV_GW_MODE_CLIENT
:
210 /* gateway clients should send dhcp requests
211 * via unicast to their gateway
213 ret
= batadv_gw_is_dhcp_target(skb
, &header_len
);
217 case BATADV_GW_MODE_OFF
:
223 /* ethernet packet should be broadcasted */
225 primary_if
= batadv_primary_if_get_selected(bat_priv
);
229 /* in case of ARP request, we do not immediately broadcasti the
230 * packet, instead we first wait for DAT to try to retrieve the
233 if (batadv_dat_snoop_outgoing_arp_request(bat_priv
, skb
))
234 brd_delay
= msecs_to_jiffies(ARP_REQ_DELAY
);
236 if (batadv_skb_head_push(skb
, sizeof(*bcast_packet
)) < 0)
239 bcast_packet
= (struct batadv_bcast_packet
*)skb
->data
;
240 bcast_packet
->header
.version
= BATADV_COMPAT_VERSION
;
241 bcast_packet
->header
.ttl
= BATADV_TTL
;
243 /* batman packet type: broadcast */
244 bcast_packet
->header
.packet_type
= BATADV_BCAST
;
245 bcast_packet
->reserved
= 0;
247 /* hw address of first interface is the orig mac because only
248 * this mac is known throughout the mesh
250 memcpy(bcast_packet
->orig
,
251 primary_if
->net_dev
->dev_addr
, ETH_ALEN
);
253 /* set broadcast sequence number */
254 seqno
= atomic_inc_return(&bat_priv
->bcast_seqno
);
255 bcast_packet
->seqno
= htonl(seqno
);
257 batadv_add_bcast_packet_to_list(bat_priv
, skb
, brd_delay
);
259 /* a copy is stored in the bcast list, therefore removing
266 if (atomic_read(&bat_priv
->gw_mode
) != BATADV_GW_MODE_OFF
) {
267 ret
= batadv_gw_out_of_range(bat_priv
, skb
, ethhdr
);
272 if (batadv_dat_snoop_outgoing_arp_request(bat_priv
, skb
))
275 batadv_dat_snoop_outgoing_arp_reply(bat_priv
, skb
);
277 ret
= batadv_unicast_send_skb(bat_priv
, skb
);
282 batadv_inc_counter(bat_priv
, BATADV_CNT_TX
);
283 batadv_add_counter(bat_priv
, BATADV_CNT_TX_BYTES
, data_len
);
289 batadv_inc_counter(bat_priv
, BATADV_CNT_TX_DROPPED
);
292 batadv_hardif_free_ref(primary_if
);
296 void batadv_interface_rx(struct net_device
*soft_iface
,
297 struct sk_buff
*skb
, struct batadv_hard_iface
*recv_if
,
298 int hdr_size
, struct batadv_orig_node
*orig_node
)
300 struct batadv_priv
*bat_priv
= netdev_priv(soft_iface
);
301 struct ethhdr
*ethhdr
;
302 struct vlan_ethhdr
*vhdr
;
303 struct batadv_header
*batadv_header
= (struct batadv_header
*)skb
->data
;
304 short vid __maybe_unused
= -1;
305 __be16 ethertype
= __constant_htons(BATADV_ETH_P_BATMAN
);
308 is_bcast
= (batadv_header
->packet_type
== BATADV_BCAST
);
310 /* check if enough space is available for pulling, and pull */
311 if (!pskb_may_pull(skb
, hdr_size
))
314 skb_pull_rcsum(skb
, hdr_size
);
315 skb_reset_mac_header(skb
);
317 ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
319 switch (ntohs(ethhdr
->h_proto
)) {
321 vhdr
= (struct vlan_ethhdr
*)skb
->data
;
322 vid
= ntohs(vhdr
->h_vlan_TCI
) & VLAN_VID_MASK
;
324 if (vhdr
->h_vlan_encapsulated_proto
!= ethertype
)
328 case BATADV_ETH_P_BATMAN
:
332 /* skb->dev & skb->pkt_type are set here */
333 if (unlikely(!pskb_may_pull(skb
, ETH_HLEN
)))
335 skb
->protocol
= eth_type_trans(skb
, soft_iface
);
337 /* should not be necessary anymore as we use skb_pull_rcsum()
338 * TODO: please verify this and remove this TODO
339 * -- Dec 21st 2009, Simon Wunderlich
342 /* skb->ip_summed = CHECKSUM_UNNECESSARY; */
344 batadv_inc_counter(bat_priv
, BATADV_CNT_RX
);
345 batadv_add_counter(bat_priv
, BATADV_CNT_RX_BYTES
,
346 skb
->len
+ ETH_HLEN
);
348 soft_iface
->last_rx
= jiffies
;
351 batadv_tt_add_temporary_global_entry(bat_priv
, orig_node
,
354 if (batadv_is_ap_isolated(bat_priv
, ethhdr
->h_source
, ethhdr
->h_dest
))
357 /* Let the bridge loop avoidance check the packet. If will
358 * not handle it, we can safely push it up.
360 if (batadv_bla_rx(bat_priv
, skb
, vid
, is_bcast
))
372 /* batman-adv network devices have devices nesting below it and are a special
373 * "super class" of normal network devices; split their locks off into a
374 * separate class since they always nest.
376 static struct lock_class_key batadv_netdev_xmit_lock_key
;
377 static struct lock_class_key batadv_netdev_addr_lock_key
;
380 * batadv_set_lockdep_class_one - Set lockdep class for a single tx queue
381 * @dev: device which owns the tx queue
382 * @txq: tx queue to modify
383 * @_unused: always NULL
385 static void batadv_set_lockdep_class_one(struct net_device
*dev
,
386 struct netdev_queue
*txq
,
389 lockdep_set_class(&txq
->_xmit_lock
, &batadv_netdev_xmit_lock_key
);
393 * batadv_set_lockdep_class - Set txq and addr_list lockdep class
394 * @dev: network device to modify
396 static void batadv_set_lockdep_class(struct net_device
*dev
)
398 lockdep_set_class(&dev
->addr_list_lock
, &batadv_netdev_addr_lock_key
);
399 netdev_for_each_tx_queue(dev
, batadv_set_lockdep_class_one
, NULL
);
403 * batadv_softif_init - Late stage initialization of soft interface
404 * @dev: registered network device to modify
406 * Returns error code on failures
408 static int batadv_softif_init(struct net_device
*dev
)
410 batadv_set_lockdep_class(dev
);
415 static const struct net_device_ops batadv_netdev_ops
= {
416 .ndo_init
= batadv_softif_init
,
417 .ndo_open
= batadv_interface_open
,
418 .ndo_stop
= batadv_interface_release
,
419 .ndo_get_stats
= batadv_interface_stats
,
420 .ndo_set_mac_address
= batadv_interface_set_mac_addr
,
421 .ndo_change_mtu
= batadv_interface_change_mtu
,
422 .ndo_start_xmit
= batadv_interface_tx
,
423 .ndo_validate_addr
= eth_validate_addr
426 static void batadv_interface_setup(struct net_device
*dev
)
428 struct batadv_priv
*priv
= netdev_priv(dev
);
432 dev
->netdev_ops
= &batadv_netdev_ops
;
433 dev
->destructor
= free_netdev
;
434 dev
->tx_queue_len
= 0;
436 /* can't call min_mtu, because the needed variables
437 * have not been initialized yet
439 dev
->mtu
= ETH_DATA_LEN
;
440 /* reserve more space in the skbuff for our header */
441 dev
->hard_header_len
= BATADV_HEADER_LEN
;
443 /* generate random address */
444 eth_hw_addr_random(dev
);
446 SET_ETHTOOL_OPS(dev
, &batadv_ethtool_ops
);
448 memset(priv
, 0, sizeof(*priv
));
451 struct net_device
*batadv_softif_create(const char *name
)
453 struct net_device
*soft_iface
;
454 struct batadv_priv
*bat_priv
;
456 size_t cnt_len
= sizeof(uint64_t) * BATADV_CNT_NUM
;
458 soft_iface
= alloc_netdev(sizeof(*bat_priv
), name
,
459 batadv_interface_setup
);
464 bat_priv
= netdev_priv(soft_iface
);
466 /* batadv_interface_stats() needs to be available as soon as
467 * register_netdevice() has been called
469 bat_priv
->bat_counters
= __alloc_percpu(cnt_len
, __alignof__(uint64_t));
470 if (!bat_priv
->bat_counters
)
471 goto free_soft_iface
;
473 ret
= register_netdevice(soft_iface
);
475 pr_err("Unable to register the batman interface '%s': %i\n",
477 goto free_bat_counters
;
480 atomic_set(&bat_priv
->aggregated_ogms
, 1);
481 atomic_set(&bat_priv
->bonding
, 0);
482 atomic_set(&bat_priv
->bridge_loop_avoidance
, 0);
483 #ifdef CONFIG_BATMAN_ADV_DAT
484 atomic_set(&bat_priv
->distributed_arp_table
, 1);
486 atomic_set(&bat_priv
->ap_isolation
, 0);
487 atomic_set(&bat_priv
->vis_mode
, BATADV_VIS_TYPE_CLIENT_UPDATE
);
488 atomic_set(&bat_priv
->gw_mode
, BATADV_GW_MODE_OFF
);
489 atomic_set(&bat_priv
->gw_sel_class
, 20);
490 atomic_set(&bat_priv
->gw_bandwidth
, 41);
491 atomic_set(&bat_priv
->orig_interval
, 1000);
492 atomic_set(&bat_priv
->hop_penalty
, 30);
493 atomic_set(&bat_priv
->log_level
, 0);
494 atomic_set(&bat_priv
->fragmentation
, 1);
495 atomic_set(&bat_priv
->bcast_queue_left
, BATADV_BCAST_QUEUE_LEN
);
496 atomic_set(&bat_priv
->batman_queue_left
, BATADV_BATMAN_QUEUE_LEN
);
498 atomic_set(&bat_priv
->mesh_state
, BATADV_MESH_INACTIVE
);
499 atomic_set(&bat_priv
->bcast_seqno
, 1);
500 atomic_set(&bat_priv
->tt
.vn
, 0);
501 atomic_set(&bat_priv
->tt
.local_changes
, 0);
502 atomic_set(&bat_priv
->tt
.ogm_append_cnt
, 0);
503 #ifdef CONFIG_BATMAN_ADV_BLA
504 atomic_set(&bat_priv
->bla
.num_requests
, 0);
506 bat_priv
->tt
.last_changeset
= NULL
;
507 bat_priv
->tt
.last_changeset_len
= 0;
509 bat_priv
->primary_if
= NULL
;
510 bat_priv
->num_ifaces
= 0;
512 ret
= batadv_algo_select(bat_priv
, batadv_routing_algo
);
514 goto unreg_soft_iface
;
516 ret
= batadv_sysfs_add_meshif(soft_iface
);
518 goto unreg_soft_iface
;
520 ret
= batadv_debugfs_add_meshif(soft_iface
);
524 ret
= batadv_mesh_init(soft_iface
);
531 batadv_debugfs_del_meshif(soft_iface
);
533 batadv_sysfs_del_meshif(soft_iface
);
535 free_percpu(bat_priv
->bat_counters
);
536 unregister_netdevice(soft_iface
);
540 free_percpu(bat_priv
->bat_counters
);
542 free_netdev(soft_iface
);
547 void batadv_softif_destroy(struct net_device
*soft_iface
)
549 batadv_debugfs_del_meshif(soft_iface
);
550 batadv_sysfs_del_meshif(soft_iface
);
551 batadv_mesh_free(soft_iface
);
552 unregister_netdevice(soft_iface
);
555 int batadv_softif_is_valid(const struct net_device
*net_dev
)
557 if (net_dev
->netdev_ops
->ndo_start_xmit
== batadv_interface_tx
)
564 static int batadv_get_settings(struct net_device
*dev
, struct ethtool_cmd
*cmd
)
567 cmd
->advertising
= 0;
568 ethtool_cmd_speed_set(cmd
, SPEED_10
);
569 cmd
->duplex
= DUPLEX_FULL
;
571 cmd
->phy_address
= 0;
572 cmd
->transceiver
= XCVR_INTERNAL
;
573 cmd
->autoneg
= AUTONEG_DISABLE
;
580 static void batadv_get_drvinfo(struct net_device
*dev
,
581 struct ethtool_drvinfo
*info
)
583 strcpy(info
->driver
, "B.A.T.M.A.N. advanced");
584 strcpy(info
->version
, BATADV_SOURCE_VERSION
);
585 strcpy(info
->fw_version
, "N/A");
586 strcpy(info
->bus_info
, "batman");
589 static u32
batadv_get_msglevel(struct net_device
*dev
)
594 static void batadv_set_msglevel(struct net_device
*dev
, u32 value
)
598 static u32
batadv_get_link(struct net_device
*dev
)
603 /* Inspired by drivers/net/ethernet/dlink/sundance.c:1702
604 * Declare each description string in struct.name[] to get fixed sized buffer
605 * and compile time checking for strings longer than ETH_GSTRING_LEN.
607 static const struct {
608 const char name
[ETH_GSTRING_LEN
];
609 } batadv_counters_strings
[] = {
623 { "tt_response_tx" },
624 { "tt_response_rx" },
625 { "tt_roam_adv_tx" },
626 { "tt_roam_adv_rx" },
627 #ifdef CONFIG_BATMAN_ADV_DAT
632 { "dat_cached_reply_tx" },
636 static void batadv_get_strings(struct net_device
*dev
, uint32_t stringset
,
639 if (stringset
== ETH_SS_STATS
)
640 memcpy(data
, batadv_counters_strings
,
641 sizeof(batadv_counters_strings
));
644 static void batadv_get_ethtool_stats(struct net_device
*dev
,
645 struct ethtool_stats
*stats
,
648 struct batadv_priv
*bat_priv
= netdev_priv(dev
);
651 for (i
= 0; i
< BATADV_CNT_NUM
; i
++)
652 data
[i
] = batadv_sum_counter(bat_priv
, i
);
655 static int batadv_get_sset_count(struct net_device
*dev
, int stringset
)
657 if (stringset
== ETH_SS_STATS
)
658 return BATADV_CNT_NUM
;