2 * Copyright (C) 2007-2011 B.A.T.M.A.N. contributors:
4 * Marek Lindner, Simon Wunderlich
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of version 2 of the GNU General Public
8 * License as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
23 #include "soft-interface.h"
24 #include "hard-interface.h"
27 #include "bat_debugfs.h"
28 #include "translation-table.h"
30 #include "gateway_common.h"
31 #include "gateway_client.h"
32 #include "bat_sysfs.h"
33 #include <linux/slab.h>
34 #include <linux/ethtool.h>
35 #include <linux/etherdevice.h>
36 #include <linux/if_vlan.h>
40 static int bat_get_settings(struct net_device *dev, struct ethtool_cmd *cmd);
41 static void bat_get_drvinfo(struct net_device *dev,
42 struct ethtool_drvinfo *info);
43 static u32 bat_get_msglevel(struct net_device *dev);
44 static void bat_set_msglevel(struct net_device *dev, u32 value);
45 static u32 bat_get_link(struct net_device *dev);
46 static u32 bat_get_rx_csum(struct net_device *dev);
47 static int bat_set_rx_csum(struct net_device *dev, u32 data);
49 static const struct ethtool_ops bat_ethtool_ops = {
50 .get_settings = bat_get_settings,
51 .get_drvinfo = bat_get_drvinfo,
52 .get_msglevel = bat_get_msglevel,
53 .set_msglevel = bat_set_msglevel,
54 .get_link = bat_get_link,
55 .get_rx_csum = bat_get_rx_csum,
56 .set_rx_csum = bat_set_rx_csum
59 int my_skb_head_push(struct sk_buff *skb, unsigned int len)
64 * TODO: We must check if we can release all references to non-payload
65 * data using skb_header_release in our skbs to allow skb_cow_header to
66 * work optimally. This means that those skbs are not allowed to read
67 * or write any data which is before the current position of skb->data
68 * after that call and thus allow other skbs with the same data buffer
69 * to write freely in that area.
71 result = skb_cow_head(skb, len);
79 static void softif_neigh_free_rcu(struct rcu_head *rcu)
81 struct softif_neigh *softif_neigh;
83 softif_neigh = container_of(rcu, struct softif_neigh, rcu);
87 static void softif_neigh_free_ref(struct softif_neigh *softif_neigh)
89 if (atomic_dec_and_test(&softif_neigh->refcount))
90 call_rcu(&softif_neigh->rcu, softif_neigh_free_rcu);
93 static struct softif_neigh *softif_neigh_get_selected(struct bat_priv *bat_priv)
95 struct softif_neigh *neigh;
98 neigh = rcu_dereference(bat_priv->softif_neigh);
100 if (neigh && !atomic_inc_not_zero(&neigh->refcount))
107 static void softif_neigh_select(struct bat_priv *bat_priv,
108 struct softif_neigh *new_neigh)
110 struct softif_neigh *curr_neigh;
112 spin_lock_bh(&bat_priv->softif_neigh_lock);
114 if (new_neigh && !atomic_inc_not_zero(&new_neigh->refcount))
117 curr_neigh = bat_priv->softif_neigh;
118 rcu_assign_pointer(bat_priv->softif_neigh, new_neigh);
121 softif_neigh_free_ref(curr_neigh);
123 spin_unlock_bh(&bat_priv->softif_neigh_lock);
126 static void softif_neigh_deselect(struct bat_priv *bat_priv)
128 softif_neigh_select(bat_priv, NULL);
131 void softif_neigh_purge(struct bat_priv *bat_priv)
133 struct softif_neigh *softif_neigh, *curr_softif_neigh;
134 struct hlist_node *node, *node_tmp;
135 char do_deselect = 0;
137 curr_softif_neigh = softif_neigh_get_selected(bat_priv);
139 spin_lock_bh(&bat_priv->softif_neigh_lock);
141 hlist_for_each_entry_safe(softif_neigh, node, node_tmp,
142 &bat_priv->softif_neigh_list, list) {
144 if ((!time_after(jiffies, softif_neigh->last_seen +
145 msecs_to_jiffies(SOFTIF_NEIGH_TIMEOUT))) &&
146 (atomic_read(&bat_priv->mesh_state) == MESH_ACTIVE))
149 if (curr_softif_neigh == softif_neigh) {
150 bat_dbg(DBG_ROUTES, bat_priv,
151 "Current mesh exit point '%pM' vanished "
153 softif_neigh->addr, softif_neigh->vid);
157 hlist_del_rcu(&softif_neigh->list);
158 softif_neigh_free_ref(softif_neigh);
161 spin_unlock_bh(&bat_priv->softif_neigh_lock);
163 /* soft_neigh_deselect() needs to acquire the softif_neigh_lock */
165 softif_neigh_deselect(bat_priv);
167 if (curr_softif_neigh)
168 softif_neigh_free_ref(curr_softif_neigh);
171 static struct softif_neigh *softif_neigh_get(struct bat_priv *bat_priv,
172 uint8_t *addr, short vid)
174 struct softif_neigh *softif_neigh;
175 struct hlist_node *node;
178 hlist_for_each_entry_rcu(softif_neigh, node,
179 &bat_priv->softif_neigh_list, list) {
180 if (!compare_eth(softif_neigh->addr, addr))
183 if (softif_neigh->vid != vid)
186 if (!atomic_inc_not_zero(&softif_neigh->refcount))
189 softif_neigh->last_seen = jiffies;
193 softif_neigh = kzalloc(sizeof(struct softif_neigh), GFP_ATOMIC);
197 memcpy(softif_neigh->addr, addr, ETH_ALEN);
198 softif_neigh->vid = vid;
199 softif_neigh->last_seen = jiffies;
200 /* initialize with 2 - caller decrements counter by one */
201 atomic_set(&softif_neigh->refcount, 2);
203 INIT_HLIST_NODE(&softif_neigh->list);
204 spin_lock_bh(&bat_priv->softif_neigh_lock);
205 hlist_add_head_rcu(&softif_neigh->list, &bat_priv->softif_neigh_list);
206 spin_unlock_bh(&bat_priv->softif_neigh_lock);
213 int softif_neigh_seq_print_text(struct seq_file *seq, void *offset)
215 struct net_device *net_dev = (struct net_device *)seq->private;
216 struct bat_priv *bat_priv = netdev_priv(net_dev);
217 struct softif_neigh *softif_neigh;
218 struct hlist_node *node;
219 struct softif_neigh *curr_softif_neigh;
221 if (!bat_priv->primary_if) {
222 return seq_printf(seq, "BATMAN mesh %s disabled - "
223 "please specify interfaces to enable it\n",
227 seq_printf(seq, "Softif neighbor list (%s)\n", net_dev->name);
229 curr_softif_neigh = softif_neigh_get_selected(bat_priv);
231 hlist_for_each_entry_rcu(softif_neigh, node,
232 &bat_priv->softif_neigh_list, list)
233 seq_printf(seq, "%s %pM (vid: %d)\n",
234 curr_softif_neigh == softif_neigh
235 ? "=>" : " ", softif_neigh->addr,
238 if (curr_softif_neigh)
239 softif_neigh_free_ref(curr_softif_neigh);
244 static void softif_batman_recv(struct sk_buff *skb, struct net_device *dev,
247 struct bat_priv *bat_priv = netdev_priv(dev);
248 struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
249 struct batman_packet *batman_packet;
250 struct softif_neigh *softif_neigh;
251 struct softif_neigh *curr_softif_neigh = NULL;
253 if (ntohs(ethhdr->h_proto) == ETH_P_8021Q)
254 batman_packet = (struct batman_packet *)
255 (skb->data + ETH_HLEN + VLAN_HLEN);
257 batman_packet = (struct batman_packet *)(skb->data + ETH_HLEN);
259 if (batman_packet->version != COMPAT_VERSION)
262 if (batman_packet->packet_type != BAT_PACKET)
265 if (!(batman_packet->flags & PRIMARIES_FIRST_HOP))
268 if (is_my_mac(batman_packet->orig))
271 softif_neigh = softif_neigh_get(bat_priv, batman_packet->orig, vid);
276 curr_softif_neigh = softif_neigh_get_selected(bat_priv);
277 if (curr_softif_neigh == softif_neigh)
280 /* we got a neighbor but its mac is 'bigger' than ours */
281 if (memcmp(bat_priv->primary_if->net_dev->dev_addr,
282 softif_neigh->addr, ETH_ALEN) < 0)
285 /* switch to new 'smallest neighbor' */
286 if ((curr_softif_neigh) &&
287 (memcmp(softif_neigh->addr, curr_softif_neigh->addr,
289 bat_dbg(DBG_ROUTES, bat_priv,
290 "Changing mesh exit point from %pM (vid: %d) "
291 "to %pM (vid: %d).\n",
292 curr_softif_neigh->addr,
293 curr_softif_neigh->vid,
294 softif_neigh->addr, softif_neigh->vid);
296 softif_neigh_select(bat_priv, softif_neigh);
300 /* close own batX device and use softif_neigh as exit node */
301 if ((!curr_softif_neigh) &&
302 (memcmp(softif_neigh->addr,
303 bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN) < 0)) {
304 bat_dbg(DBG_ROUTES, bat_priv,
305 "Setting mesh exit point to %pM (vid: %d).\n",
306 softif_neigh->addr, softif_neigh->vid);
308 softif_neigh_select(bat_priv, softif_neigh);
313 softif_neigh_free_ref(softif_neigh);
316 if (curr_softif_neigh)
317 softif_neigh_free_ref(curr_softif_neigh);
322 static int interface_open(struct net_device *dev)
324 netif_start_queue(dev);
328 static int interface_release(struct net_device *dev)
330 netif_stop_queue(dev);
334 static struct net_device_stats *interface_stats(struct net_device *dev)
336 struct bat_priv *bat_priv = netdev_priv(dev);
337 return &bat_priv->stats;
340 static int interface_set_mac_addr(struct net_device *dev, void *p)
342 struct bat_priv *bat_priv = netdev_priv(dev);
343 struct sockaddr *addr = p;
345 if (!is_valid_ether_addr(addr->sa_data))
346 return -EADDRNOTAVAIL;
348 /* only modify hna-table if it has been initialised before */
349 if (atomic_read(&bat_priv->mesh_state) == MESH_ACTIVE) {
350 hna_local_remove(bat_priv, dev->dev_addr,
351 "mac address changed");
352 hna_local_add(dev, addr->sa_data);
355 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
359 static int interface_change_mtu(struct net_device *dev, int new_mtu)
362 if ((new_mtu < 68) || (new_mtu > hardif_min_mtu(dev)))
370 int interface_tx(struct sk_buff *skb, struct net_device *soft_iface)
372 struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
373 struct bat_priv *bat_priv = netdev_priv(soft_iface);
374 struct bcast_packet *bcast_packet;
375 struct vlan_ethhdr *vhdr;
376 struct softif_neigh *curr_softif_neigh = NULL;
377 int data_len = skb->len, ret;
379 bool do_bcast = false;
381 if (atomic_read(&bat_priv->mesh_state) != MESH_ACTIVE)
384 soft_iface->trans_start = jiffies;
386 switch (ntohs(ethhdr->h_proto)) {
388 vhdr = (struct vlan_ethhdr *)skb->data;
389 vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;
391 if (ntohs(vhdr->h_vlan_encapsulated_proto) != ETH_P_BATMAN)
396 softif_batman_recv(skb, soft_iface, vid);
401 * if we have a another chosen mesh exit node in range
402 * it will transport the packets to the mesh
404 curr_softif_neigh = softif_neigh_get_selected(bat_priv);
405 if ((curr_softif_neigh) && (curr_softif_neigh->vid == vid))
408 /* TODO: check this for locks */
409 hna_local_add(soft_iface, ethhdr->h_source);
411 if (is_multicast_ether_addr(ethhdr->h_dest)) {
412 ret = gw_is_target(bat_priv, skb);
421 /* ethernet packet should be broadcasted */
423 if (!bat_priv->primary_if)
426 if (my_skb_head_push(skb, sizeof(struct bcast_packet)) < 0)
429 bcast_packet = (struct bcast_packet *)skb->data;
430 bcast_packet->version = COMPAT_VERSION;
431 bcast_packet->ttl = TTL;
433 /* batman packet type: broadcast */
434 bcast_packet->packet_type = BAT_BCAST;
436 /* hw address of first interface is the orig mac because only
437 * this mac is known throughout the mesh */
438 memcpy(bcast_packet->orig,
439 bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
441 /* set broadcast sequence number */
442 bcast_packet->seqno =
443 htonl(atomic_inc_return(&bat_priv->bcast_seqno));
445 add_bcast_packet_to_list(bat_priv, skb);
447 /* a copy is stored in the bcast list, therefore removing
448 * the original skb. */
453 ret = unicast_send_skb(skb, bat_priv);
458 bat_priv->stats.tx_packets++;
459 bat_priv->stats.tx_bytes += data_len;
465 bat_priv->stats.tx_dropped++;
467 if (curr_softif_neigh)
468 softif_neigh_free_ref(curr_softif_neigh);
472 void interface_rx(struct net_device *soft_iface,
473 struct sk_buff *skb, struct hard_iface *recv_if,
476 struct bat_priv *bat_priv = netdev_priv(soft_iface);
477 struct unicast_packet *unicast_packet;
478 struct ethhdr *ethhdr;
479 struct vlan_ethhdr *vhdr;
480 struct softif_neigh *curr_softif_neigh = NULL;
484 /* check if enough space is available for pulling, and pull */
485 if (!pskb_may_pull(skb, hdr_size))
488 skb_pull_rcsum(skb, hdr_size);
489 skb_reset_mac_header(skb);
491 ethhdr = (struct ethhdr *)skb_mac_header(skb);
493 switch (ntohs(ethhdr->h_proto)) {
495 vhdr = (struct vlan_ethhdr *)skb->data;
496 vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;
498 if (ntohs(vhdr->h_vlan_encapsulated_proto) != ETH_P_BATMAN)
507 * if we have a another chosen mesh exit node in range
508 * it will transport the packets to the non-mesh network
510 curr_softif_neigh = softif_neigh_get_selected(bat_priv);
511 if (curr_softif_neigh && (curr_softif_neigh->vid == vid)) {
512 skb_push(skb, hdr_size);
513 unicast_packet = (struct unicast_packet *)skb->data;
515 if ((unicast_packet->packet_type != BAT_UNICAST) &&
516 (unicast_packet->packet_type != BAT_UNICAST_FRAG))
519 skb_reset_mac_header(skb);
521 memcpy(unicast_packet->dest,
522 curr_softif_neigh->addr, ETH_ALEN);
523 ret = route_unicast_packet(skb, recv_if);
524 if (ret == NET_RX_DROP)
530 /* skb->dev & skb->pkt_type are set here */
531 if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
533 skb->protocol = eth_type_trans(skb, soft_iface);
535 /* should not be neccesary anymore as we use skb_pull_rcsum()
536 * TODO: please verify this and remove this TODO
537 * -- Dec 21st 2009, Simon Wunderlich */
539 /* skb->ip_summed = CHECKSUM_UNNECESSARY;*/
541 bat_priv->stats.rx_packets++;
542 bat_priv->stats.rx_bytes += skb->len + sizeof(struct ethhdr);
544 soft_iface->last_rx = jiffies;
552 if (curr_softif_neigh)
553 softif_neigh_free_ref(curr_softif_neigh);
557 #ifdef HAVE_NET_DEVICE_OPS
558 static const struct net_device_ops bat_netdev_ops = {
559 .ndo_open = interface_open,
560 .ndo_stop = interface_release,
561 .ndo_get_stats = interface_stats,
562 .ndo_set_mac_address = interface_set_mac_addr,
563 .ndo_change_mtu = interface_change_mtu,
564 .ndo_start_xmit = interface_tx,
565 .ndo_validate_addr = eth_validate_addr
569 static void interface_setup(struct net_device *dev)
571 struct bat_priv *priv = netdev_priv(dev);
572 char dev_addr[ETH_ALEN];
576 #ifdef HAVE_NET_DEVICE_OPS
577 dev->netdev_ops = &bat_netdev_ops;
579 dev->open = interface_open;
580 dev->stop = interface_release;
581 dev->get_stats = interface_stats;
582 dev->set_mac_address = interface_set_mac_addr;
583 dev->change_mtu = interface_change_mtu;
584 dev->hard_start_xmit = interface_tx;
586 dev->destructor = free_netdev;
587 dev->tx_queue_len = 0;
590 * can't call min_mtu, because the needed variables
591 * have not been initialized yet
593 dev->mtu = ETH_DATA_LEN;
594 dev->hard_header_len = BAT_HEADER_LEN; /* reserve more space in the
595 * skbuff for our header */
597 /* generate random address */
598 random_ether_addr(dev_addr);
599 memcpy(dev->dev_addr, dev_addr, ETH_ALEN);
601 SET_ETHTOOL_OPS(dev, &bat_ethtool_ops);
603 memset(priv, 0, sizeof(struct bat_priv));
606 struct net_device *softif_create(char *name)
608 struct net_device *soft_iface;
609 struct bat_priv *bat_priv;
612 soft_iface = alloc_netdev(sizeof(struct bat_priv) , name,
616 pr_err("Unable to allocate the batman interface: %s\n", name);
620 ret = register_netdev(soft_iface);
622 pr_err("Unable to register the batman interface '%s': %i\n",
624 goto free_soft_iface;
627 bat_priv = netdev_priv(soft_iface);
629 atomic_set(&bat_priv->aggregated_ogms, 1);
630 atomic_set(&bat_priv->bonding, 0);
631 atomic_set(&bat_priv->vis_mode, VIS_TYPE_CLIENT_UPDATE);
632 atomic_set(&bat_priv->gw_mode, GW_MODE_OFF);
633 atomic_set(&bat_priv->gw_sel_class, 20);
634 atomic_set(&bat_priv->gw_bandwidth, 41);
635 atomic_set(&bat_priv->orig_interval, 1000);
636 atomic_set(&bat_priv->hop_penalty, 10);
637 atomic_set(&bat_priv->log_level, 0);
638 atomic_set(&bat_priv->fragmentation, 1);
639 atomic_set(&bat_priv->bcast_queue_left, BCAST_QUEUE_LEN);
640 atomic_set(&bat_priv->batman_queue_left, BATMAN_QUEUE_LEN);
642 atomic_set(&bat_priv->mesh_state, MESH_INACTIVE);
643 atomic_set(&bat_priv->bcast_seqno, 1);
644 atomic_set(&bat_priv->hna_local_changed, 0);
646 bat_priv->primary_if = NULL;
647 bat_priv->num_ifaces = 0;
648 bat_priv->softif_neigh = NULL;
650 ret = sysfs_add_meshif(soft_iface);
652 goto unreg_soft_iface;
654 ret = debugfs_add_meshif(soft_iface);
658 ret = mesh_init(soft_iface);
665 debugfs_del_meshif(soft_iface);
667 sysfs_del_meshif(soft_iface);
669 unregister_netdev(soft_iface);
673 free_netdev(soft_iface);
678 void softif_destroy(struct net_device *soft_iface)
680 debugfs_del_meshif(soft_iface);
681 sysfs_del_meshif(soft_iface);
682 mesh_free(soft_iface);
683 unregister_netdevice(soft_iface);
686 int softif_is_valid(struct net_device *net_dev)
688 #ifdef HAVE_NET_DEVICE_OPS
689 if (net_dev->netdev_ops->ndo_start_xmit == interface_tx)
692 if (net_dev->hard_start_xmit == interface_tx)
700 static int bat_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
703 cmd->advertising = 0;
704 cmd->speed = SPEED_10;
705 cmd->duplex = DUPLEX_FULL;
707 cmd->phy_address = 0;
708 cmd->transceiver = XCVR_INTERNAL;
709 cmd->autoneg = AUTONEG_DISABLE;
716 static void bat_get_drvinfo(struct net_device *dev,
717 struct ethtool_drvinfo *info)
719 strcpy(info->driver, "B.A.T.M.A.N. advanced");
720 strcpy(info->version, SOURCE_VERSION);
721 strcpy(info->fw_version, "N/A");
722 strcpy(info->bus_info, "batman");
725 static u32 bat_get_msglevel(struct net_device *dev)
730 static void bat_set_msglevel(struct net_device *dev, u32 value)
734 static u32 bat_get_link(struct net_device *dev)
739 static u32 bat_get_rx_csum(struct net_device *dev)
744 static int bat_set_rx_csum(struct net_device *dev, u32 data)