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"
26 #include "translation-table.h"
28 #include "gateway_common.h"
29 #include "gateway_client.h"
31 #include "originator.h"
32 #include <linux/slab.h>
33 #include <linux/ethtool.h>
34 #include <linux/etherdevice.h>
35 #include <linux/if_vlan.h>
37 #include "bridge_loop_avoidance.h"
40 static int batadv_get_settings(struct net_device *dev, struct ethtool_cmd *cmd);
41 static void batadv_get_drvinfo(struct net_device *dev,
42 struct ethtool_drvinfo *info);
43 static u32 batadv_get_msglevel(struct net_device *dev);
44 static void batadv_set_msglevel(struct net_device *dev, u32 value);
45 static u32 batadv_get_link(struct net_device *dev);
46 static void batadv_get_strings(struct net_device *dev, u32 stringset, u8 *data);
47 static void batadv_get_ethtool_stats(struct net_device *dev,
48 struct ethtool_stats *stats, u64 *data);
49 static int batadv_get_sset_count(struct net_device *dev, int stringset);
51 static const struct ethtool_ops batadv_ethtool_ops = {
52 .get_settings = batadv_get_settings,
53 .get_drvinfo = batadv_get_drvinfo,
54 .get_msglevel = batadv_get_msglevel,
55 .set_msglevel = batadv_set_msglevel,
56 .get_link = batadv_get_link,
57 .get_strings = batadv_get_strings,
58 .get_ethtool_stats = batadv_get_ethtool_stats,
59 .get_sset_count = batadv_get_sset_count,
62 int batadv_skb_head_push(struct sk_buff *skb, unsigned int len)
66 /* TODO: We must check if we can release all references to non-payload
67 * data using skb_header_release in our skbs to allow skb_cow_header to
68 * work optimally. This means that those skbs are not allowed to read
69 * or write any data which is before the current position of skb->data
70 * after that call and thus allow other skbs with the same data buffer
71 * to write freely in that area.
73 result = skb_cow_head(skb, len);
81 static int batadv_interface_open(struct net_device *dev)
83 netif_start_queue(dev);
87 static int batadv_interface_release(struct net_device *dev)
89 netif_stop_queue(dev);
93 static struct net_device_stats *batadv_interface_stats(struct net_device *dev)
95 struct batadv_priv *bat_priv = netdev_priv(dev);
96 struct net_device_stats *stats = &bat_priv->stats;
98 stats->tx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_TX);
99 stats->tx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_TX_BYTES);
100 stats->tx_dropped = batadv_sum_counter(bat_priv, BATADV_CNT_TX_DROPPED);
101 stats->rx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_RX);
102 stats->rx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_RX_BYTES);
106 static int batadv_interface_set_mac_addr(struct net_device *dev, void *p)
108 struct batadv_priv *bat_priv = netdev_priv(dev);
109 struct sockaddr *addr = p;
110 uint8_t old_addr[ETH_ALEN];
112 if (!is_valid_ether_addr(addr->sa_data))
113 return -EADDRNOTAVAIL;
115 memcpy(old_addr, dev->dev_addr, ETH_ALEN);
116 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
118 /* only modify transtable if it has been initialized before */
119 if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_ACTIVE) {
120 batadv_tt_local_remove(bat_priv, old_addr,
121 "mac address changed", false);
122 batadv_tt_local_add(dev, addr->sa_data, BATADV_NULL_IFINDEX);
125 dev->addr_assign_type &= ~NET_ADDR_RANDOM;
129 static int batadv_interface_change_mtu(struct net_device *dev, int new_mtu)
132 if ((new_mtu < 68) || (new_mtu > batadv_hardif_min_mtu(dev)))
140 static int batadv_interface_tx(struct sk_buff *skb,
141 struct net_device *soft_iface)
143 struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
144 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
145 struct batadv_hard_iface *primary_if = NULL;
146 struct batadv_bcast_packet *bcast_packet;
147 struct vlan_ethhdr *vhdr;
148 __be16 ethertype = __constant_htons(BATADV_ETH_P_BATMAN);
149 static const uint8_t stp_addr[ETH_ALEN] = {0x01, 0x80, 0xC2, 0x00,
151 static const uint8_t ectp_addr[ETH_ALEN] = {0xCF, 0x00, 0x00, 0x00,
153 unsigned int header_len = 0;
154 int data_len = skb->len, ret;
155 short vid __maybe_unused = -1;
156 bool do_bcast = false;
159 if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
162 soft_iface->trans_start = jiffies;
164 switch (ntohs(ethhdr->h_proto)) {
166 vhdr = (struct vlan_ethhdr *)skb->data;
167 vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;
169 if (vhdr->h_vlan_encapsulated_proto != ethertype)
173 case BATADV_ETH_P_BATMAN:
177 if (batadv_bla_tx(bat_priv, skb, vid))
180 /* Register the client MAC in the transtable */
181 batadv_tt_local_add(soft_iface, ethhdr->h_source, skb->skb_iif);
183 /* don't accept stp packets. STP does not help in meshes.
184 * better use the bridge loop avoidance ...
186 * The same goes for ECTP sent at least by some Cisco Switches,
187 * it might confuse the mesh when used with bridge loop avoidance.
189 if (batadv_compare_eth(ethhdr->h_dest, stp_addr))
192 if (batadv_compare_eth(ethhdr->h_dest, ectp_addr))
195 if (is_multicast_ether_addr(ethhdr->h_dest)) {
198 switch (atomic_read(&bat_priv->gw_mode)) {
199 case BATADV_GW_MODE_SERVER:
200 /* gateway servers should not send dhcp
201 * requests into the mesh
203 ret = batadv_gw_is_dhcp_target(skb, &header_len);
207 case BATADV_GW_MODE_CLIENT:
208 /* gateway clients should send dhcp requests
209 * via unicast to their gateway
211 ret = batadv_gw_is_dhcp_target(skb, &header_len);
215 case BATADV_GW_MODE_OFF:
221 /* ethernet packet should be broadcasted */
223 primary_if = batadv_primary_if_get_selected(bat_priv);
227 if (batadv_skb_head_push(skb, sizeof(*bcast_packet)) < 0)
230 bcast_packet = (struct batadv_bcast_packet *)skb->data;
231 bcast_packet->header.version = BATADV_COMPAT_VERSION;
232 bcast_packet->header.ttl = BATADV_TTL;
234 /* batman packet type: broadcast */
235 bcast_packet->header.packet_type = BATADV_BCAST;
236 bcast_packet->reserved = 0;
238 /* hw address of first interface is the orig mac because only
239 * this mac is known throughout the mesh
241 memcpy(bcast_packet->orig,
242 primary_if->net_dev->dev_addr, ETH_ALEN);
244 /* set broadcast sequence number */
245 seqno = atomic_inc_return(&bat_priv->bcast_seqno);
246 bcast_packet->seqno = htonl(seqno);
248 batadv_add_bcast_packet_to_list(bat_priv, skb, 1);
250 /* a copy is stored in the bcast list, therefore removing
257 if (atomic_read(&bat_priv->gw_mode) != BATADV_GW_MODE_OFF) {
258 ret = batadv_gw_out_of_range(bat_priv, skb, ethhdr);
263 ret = batadv_unicast_send_skb(skb, bat_priv);
268 batadv_inc_counter(bat_priv, BATADV_CNT_TX);
269 batadv_add_counter(bat_priv, BATADV_CNT_TX_BYTES, data_len);
275 batadv_inc_counter(bat_priv, BATADV_CNT_TX_DROPPED);
278 batadv_hardif_free_ref(primary_if);
282 void batadv_interface_rx(struct net_device *soft_iface,
283 struct sk_buff *skb, struct batadv_hard_iface *recv_if,
284 int hdr_size, struct batadv_orig_node *orig_node)
286 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
287 struct ethhdr *ethhdr;
288 struct vlan_ethhdr *vhdr;
289 struct batadv_header *batadv_header = (struct batadv_header *)skb->data;
290 short vid __maybe_unused = -1;
291 __be16 ethertype = __constant_htons(BATADV_ETH_P_BATMAN);
294 is_bcast = (batadv_header->packet_type == BATADV_BCAST);
296 /* check if enough space is available for pulling, and pull */
297 if (!pskb_may_pull(skb, hdr_size))
300 skb_pull_rcsum(skb, hdr_size);
301 skb_reset_mac_header(skb);
303 ethhdr = (struct ethhdr *)skb_mac_header(skb);
305 switch (ntohs(ethhdr->h_proto)) {
307 vhdr = (struct vlan_ethhdr *)skb->data;
308 vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;
310 if (vhdr->h_vlan_encapsulated_proto != ethertype)
314 case BATADV_ETH_P_BATMAN:
318 /* skb->dev & skb->pkt_type are set here */
319 if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
321 skb->protocol = eth_type_trans(skb, soft_iface);
323 /* should not be necessary anymore as we use skb_pull_rcsum()
324 * TODO: please verify this and remove this TODO
325 * -- Dec 21st 2009, Simon Wunderlich
328 /* skb->ip_summed = CHECKSUM_UNNECESSARY; */
330 batadv_inc_counter(bat_priv, BATADV_CNT_RX);
331 batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES,
332 skb->len + ETH_HLEN);
334 soft_iface->last_rx = jiffies;
337 batadv_tt_add_temporary_global_entry(bat_priv, orig_node,
340 if (batadv_is_ap_isolated(bat_priv, ethhdr->h_source, ethhdr->h_dest))
343 /* Let the bridge loop avoidance check the packet. If will
344 * not handle it, we can safely push it up.
346 if (batadv_bla_rx(bat_priv, skb, vid, is_bcast))
358 /* batman-adv network devices have devices nesting below it and are a special
359 * "super class" of normal network devices; split their locks off into a
360 * separate class since they always nest.
362 static struct lock_class_key batadv_netdev_xmit_lock_key;
363 static struct lock_class_key batadv_netdev_addr_lock_key;
366 * batadv_set_lockdep_class_one - Set lockdep class for a single tx queue
367 * @dev: device which owns the tx queue
368 * @txq: tx queue to modify
369 * @_unused: always NULL
371 static void batadv_set_lockdep_class_one(struct net_device *dev,
372 struct netdev_queue *txq,
375 lockdep_set_class(&txq->_xmit_lock, &batadv_netdev_xmit_lock_key);
379 * batadv_set_lockdep_class - Set txq and addr_list lockdep class
380 * @dev: network device to modify
382 static void batadv_set_lockdep_class(struct net_device *dev)
384 lockdep_set_class(&dev->addr_list_lock, &batadv_netdev_addr_lock_key);
385 netdev_for_each_tx_queue(dev, batadv_set_lockdep_class_one, NULL);
389 * batadv_softif_init - Late stage initialization of soft interface
390 * @dev: registered network device to modify
392 * Returns error code on failures
394 static int batadv_softif_init(struct net_device *dev)
396 batadv_set_lockdep_class(dev);
401 static const struct net_device_ops batadv_netdev_ops = {
402 .ndo_init = batadv_softif_init,
403 .ndo_open = batadv_interface_open,
404 .ndo_stop = batadv_interface_release,
405 .ndo_get_stats = batadv_interface_stats,
406 .ndo_set_mac_address = batadv_interface_set_mac_addr,
407 .ndo_change_mtu = batadv_interface_change_mtu,
408 .ndo_start_xmit = batadv_interface_tx,
409 .ndo_validate_addr = eth_validate_addr
412 static void batadv_interface_setup(struct net_device *dev)
414 struct batadv_priv *priv = netdev_priv(dev);
418 dev->netdev_ops = &batadv_netdev_ops;
419 dev->destructor = free_netdev;
420 dev->tx_queue_len = 0;
422 /* can't call min_mtu, because the needed variables
423 * have not been initialized yet
425 dev->mtu = ETH_DATA_LEN;
426 /* reserve more space in the skbuff for our header */
427 dev->hard_header_len = BATADV_HEADER_LEN;
429 /* generate random address */
430 eth_hw_addr_random(dev);
432 SET_ETHTOOL_OPS(dev, &batadv_ethtool_ops);
434 memset(priv, 0, sizeof(*priv));
437 struct net_device *batadv_softif_create(const char *name)
439 struct net_device *soft_iface;
440 struct batadv_priv *bat_priv;
442 size_t cnt_len = sizeof(uint64_t) * BATADV_CNT_NUM;
444 soft_iface = alloc_netdev(sizeof(*bat_priv), name,
445 batadv_interface_setup);
450 bat_priv = netdev_priv(soft_iface);
452 /* batadv_interface_stats() needs to be available as soon as
453 * register_netdevice() has been called
455 bat_priv->bat_counters = __alloc_percpu(cnt_len, __alignof__(uint64_t));
456 if (!bat_priv->bat_counters)
457 goto free_soft_iface;
459 ret = register_netdevice(soft_iface);
461 pr_err("Unable to register the batman interface '%s': %i\n",
463 goto free_bat_counters;
466 atomic_set(&bat_priv->aggregated_ogms, 1);
467 atomic_set(&bat_priv->bonding, 0);
468 atomic_set(&bat_priv->bridge_loop_avoidance, 0);
469 atomic_set(&bat_priv->ap_isolation, 0);
470 atomic_set(&bat_priv->vis_mode, BATADV_VIS_TYPE_CLIENT_UPDATE);
471 atomic_set(&bat_priv->gw_mode, BATADV_GW_MODE_OFF);
472 atomic_set(&bat_priv->gw_sel_class, 20);
473 atomic_set(&bat_priv->gw_bandwidth, 41);
474 atomic_set(&bat_priv->orig_interval, 1000);
475 atomic_set(&bat_priv->hop_penalty, 30);
476 atomic_set(&bat_priv->log_level, 0);
477 atomic_set(&bat_priv->fragmentation, 1);
478 atomic_set(&bat_priv->bcast_queue_left, BATADV_BCAST_QUEUE_LEN);
479 atomic_set(&bat_priv->batman_queue_left, BATADV_BATMAN_QUEUE_LEN);
481 atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE);
482 atomic_set(&bat_priv->bcast_seqno, 1);
483 atomic_set(&bat_priv->tt.vn, 0);
484 atomic_set(&bat_priv->tt.local_changes, 0);
485 atomic_set(&bat_priv->tt.ogm_append_cnt, 0);
486 #ifdef CONFIG_BATMAN_ADV_BLA
487 atomic_set(&bat_priv->bla.num_requests, 0);
489 bat_priv->tt.last_changeset = NULL;
490 bat_priv->tt.last_changeset_len = 0;
491 bat_priv->tt.poss_change = false;
493 bat_priv->primary_if = NULL;
494 bat_priv->num_ifaces = 0;
496 ret = batadv_algo_select(bat_priv, batadv_routing_algo);
498 goto unreg_soft_iface;
500 ret = batadv_sysfs_add_meshif(soft_iface);
502 goto unreg_soft_iface;
504 ret = batadv_debugfs_add_meshif(soft_iface);
508 ret = batadv_mesh_init(soft_iface);
515 batadv_debugfs_del_meshif(soft_iface);
517 batadv_sysfs_del_meshif(soft_iface);
519 free_percpu(bat_priv->bat_counters);
520 unregister_netdevice(soft_iface);
524 free_percpu(bat_priv->bat_counters);
526 free_netdev(soft_iface);
531 void batadv_softif_destroy(struct net_device *soft_iface)
533 batadv_debugfs_del_meshif(soft_iface);
534 batadv_sysfs_del_meshif(soft_iface);
535 batadv_mesh_free(soft_iface);
536 unregister_netdevice(soft_iface);
539 int batadv_softif_is_valid(const struct net_device *net_dev)
541 if (net_dev->netdev_ops->ndo_start_xmit == batadv_interface_tx)
548 static int batadv_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
551 cmd->advertising = 0;
552 ethtool_cmd_speed_set(cmd, SPEED_10);
553 cmd->duplex = DUPLEX_FULL;
555 cmd->phy_address = 0;
556 cmd->transceiver = XCVR_INTERNAL;
557 cmd->autoneg = AUTONEG_DISABLE;
564 static void batadv_get_drvinfo(struct net_device *dev,
565 struct ethtool_drvinfo *info)
567 strcpy(info->driver, "B.A.T.M.A.N. advanced");
568 strcpy(info->version, BATADV_SOURCE_VERSION);
569 strcpy(info->fw_version, "N/A");
570 strcpy(info->bus_info, "batman");
573 static u32 batadv_get_msglevel(struct net_device *dev)
578 static void batadv_set_msglevel(struct net_device *dev, u32 value)
582 static u32 batadv_get_link(struct net_device *dev)
587 /* Inspired by drivers/net/ethernet/dlink/sundance.c:1702
588 * Declare each description string in struct.name[] to get fixed sized buffer
589 * and compile time checking for strings longer than ETH_GSTRING_LEN.
591 static const struct {
592 const char name[ETH_GSTRING_LEN];
593 } batadv_counters_strings[] = {
607 { "tt_response_tx" },
608 { "tt_response_rx" },
609 { "tt_roam_adv_tx" },
610 { "tt_roam_adv_rx" },
613 static void batadv_get_strings(struct net_device *dev, uint32_t stringset,
616 if (stringset == ETH_SS_STATS)
617 memcpy(data, batadv_counters_strings,
618 sizeof(batadv_counters_strings));
621 static void batadv_get_ethtool_stats(struct net_device *dev,
622 struct ethtool_stats *stats,
625 struct batadv_priv *bat_priv = netdev_priv(dev);
628 for (i = 0; i < BATADV_CNT_NUM; i++)
629 data[i] = batadv_sum_counter(bat_priv, i);
632 static int batadv_get_sset_count(struct net_device *dev, int stringset)
634 if (stringset == ETH_SS_STATS)
635 return BATADV_CNT_NUM;