static ssize_t store_mesh_iface(struct kobject *kobj, struct attribute *attr,
char *buff, size_t count)
{
struct net_device *net_dev = kobj_to_netdev(kobj);
struct hard_iface *hard_iface = hardif_get_by_netdev(net_dev);
int status_tmp = -1;
int ret = count;
if (!hard_iface)
return count;
if (buff[count - 1] == '\n')
buff[count - 1] = '\0';
if (strlen(buff) >= IFNAMSIZ) {
pr_err("Invalid parameter for 'mesh_iface' setting received: "
"interface name too long '%s'\n", buff);
hardif_free_ref(hard_iface);
return -EINVAL;
}
if (strncmp(buff, "none", 4) == 0)
status_tmp = IF_NOT_IN_USE;
else
status_tmp = IF_I_WANT_YOU;
if (hard_iface->if_status == status_tmp)
goto out;
if ((hard_iface->soft_iface) &&
(strncmp(hard_iface->soft_iface->name, buff, IFNAMSIZ) == 0))
goto out;
if (!rtnl_trylock()) {
ret = -ERESTARTSYS;
goto out;
}
if (status_tmp == IF_NOT_IN_USE) {
hardif_disable_interface(hard_iface);
goto unlock;
}
/* if the interface already is in use */
if (hard_iface->if_status != IF_NOT_IN_USE)
hardif_disable_interface(hard_iface);
ret = hardif_enable_interface(hard_iface, buff);
unlock:
rtnl_unlock();
out:
hardif_free_ref(hard_iface);
return ret;
}
static ssize_t show_iface_status(struct kobject *kobj, struct attribute *attr,
char *buff)
{
struct net_device *net_dev = kobj_to_netdev(kobj);
struct hard_iface *hard_iface = hardif_get_by_netdev(net_dev);
ssize_t length;
if (!hard_iface)
return 0;
switch (hard_iface->if_status) {
case IF_TO_BE_REMOVED:
length = sprintf(buff, "disabling\n");
break;
case IF_INACTIVE:
length = sprintf(buff, "inactive\n");
break;
case IF_ACTIVE:
length = sprintf(buff, "active\n");
break;
case IF_TO_BE_ACTIVATED:
length = sprintf(buff, "enabling\n");
break;
case IF_NOT_IN_USE:
default:
length = sprintf(buff, "not in use\n");
break;
}
hardif_free_ref(hard_iface);
return length;
}
int throw_uevent(struct bat_priv *bat_priv, enum uev_type type,
enum uev_action action, const char *data)
{
int ret = -1;
struct hard_iface *primary_if = NULL;
struct kobject *bat_kobj;
char *uevent_env[4] = { NULL, NULL, NULL, NULL };
primary_if = primary_if_get_selected(bat_priv);
if (!primary_if)
goto out;
bat_kobj = &primary_if->soft_iface->dev.kobj;
uevent_env[0] = kmalloc(strlen(UEV_TYPE_VAR) +
strlen(uev_type_str[type]) + 1,
GFP_ATOMIC);
if (!uevent_env[0])
goto out;
sprintf(uevent_env[0], "%s%s", UEV_TYPE_VAR, uev_type_str[type]);
uevent_env[1] = kmalloc(strlen(UEV_ACTION_VAR) +
strlen(uev_action_str[action]) + 1,
GFP_ATOMIC);
if (!uevent_env[1])
goto out;
sprintf(uevent_env[1], "%s%s", UEV_ACTION_VAR, uev_action_str[action]);
/* If the event is DEL, ignore the data field */
if (action != UEV_DEL) {
uevent_env[2] = kmalloc(strlen(UEV_DATA_VAR) +
strlen(data) + 1, GFP_ATOMIC);
if (!uevent_env[2])
goto out;
sprintf(uevent_env[2], "%s%s", UEV_DATA_VAR, data);
}
ret = kobject_uevent_env(bat_kobj, KOBJ_CHANGE, uevent_env);
out:
kfree(uevent_env[0]);
kfree(uevent_env[1]);
kfree(uevent_env[2]);
if (primary_if)
hardif_free_ref(primary_if);
if (ret)
bat_dbg(DBG_BATMAN, bat_priv, "Impossible to send "
"uevent for (%s,%s,%s) event (err: %d)\n",
uev_type_str[type], uev_action_str[action],
(action == UEV_DEL ? "NULL" : data), ret);
return ret;
}
static ssize_t show_mesh_iface(struct kobject *kobj, struct attribute *attr,
char *buff)
{
struct net_device *net_dev = kobj_to_netdev(kobj);
struct hard_iface *hard_iface = hardif_get_by_netdev(net_dev);
ssize_t length;
if (!hard_iface)
return 0;
length = sprintf(buff, "%s\n", hard_iface->if_status == IF_NOT_IN_USE ?
"none" : hard_iface->soft_iface->name);
hardif_free_ref(hard_iface);
return length;
}
static int interface_tx(struct sk_buff *skb, struct net_device *soft_iface)
{
struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
struct bat_priv *bat_priv = netdev_priv(soft_iface);
struct hard_iface *primary_if = NULL;
struct bcast_packet *bcast_packet;
struct vlan_ethhdr *vhdr;
static const uint8_t stp_addr[ETH_ALEN] = {0x01, 0x80, 0xC2, 0x00, 0x00,
0x00};
unsigned int header_len = 0;
int data_len = skb->len, ret;
short vid __maybe_unused = -1;
bool do_bcast = false;
if (atomic_read(&bat_priv->mesh_state) != MESH_ACTIVE)
goto dropped;
soft_iface->trans_start = jiffies;
switch (ntohs(ethhdr->h_proto)) {
case ETH_P_8021Q:
vhdr = (struct vlan_ethhdr *)skb->data;
vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;
if (ntohs(vhdr->h_vlan_encapsulated_proto) != ETH_P_BATMAN)
break;
/* fall through */
case ETH_P_BATMAN:
goto dropped;
}
if (bla_tx(bat_priv, skb, vid))
goto dropped;
/* Register the client MAC in the transtable */
tt_local_add(soft_iface, ethhdr->h_source, skb->skb_iif);
/* don't accept stp packets. STP does not help in meshes.
* better use the bridge loop avoidance ...
*/
if (compare_eth(ethhdr->h_dest, stp_addr))
goto dropped;
if (is_multicast_ether_addr(ethhdr->h_dest)) {
do_bcast = true;
switch (atomic_read(&bat_priv->gw_mode)) {
case GW_MODE_SERVER:
/* gateway servers should not send dhcp
* requests into the mesh */
ret = gw_is_dhcp_target(skb, &header_len);
if (ret)
goto dropped;
break;
case GW_MODE_CLIENT:
/* gateway clients should send dhcp requests
* via unicast to their gateway */
ret = gw_is_dhcp_target(skb, &header_len);
if (ret)
do_bcast = false;
break;
case GW_MODE_OFF:
default:
break;
}
}
/* ethernet packet should be broadcasted */
if (do_bcast) {
primary_if = primary_if_get_selected(bat_priv);
if (!primary_if)
goto dropped;
if (my_skb_head_push(skb, sizeof(*bcast_packet)) < 0)
goto dropped;
bcast_packet = (struct bcast_packet *)skb->data;
bcast_packet->header.version = COMPAT_VERSION;
bcast_packet->header.ttl = TTL;
/* batman packet type: broadcast */
bcast_packet->header.packet_type = BAT_BCAST;
/* hw address of first interface is the orig mac because only
* this mac is known throughout the mesh */
memcpy(bcast_packet->orig,
primary_if->net_dev->dev_addr, ETH_ALEN);
/* set broadcast sequence number */
bcast_packet->seqno =
htonl(atomic_inc_return(&bat_priv->bcast_seqno));
add_bcast_packet_to_list(bat_priv, skb, 1);
/* a copy is stored in the bcast list, therefore removing
* the original skb. */
kfree_skb(skb);
/* unicast packet */
} else {
if (atomic_read(&bat_priv->gw_mode) != GW_MODE_OFF) {
ret = gw_out_of_range(bat_priv, skb, ethhdr);
if (ret)
goto dropped;
}
ret = unicast_send_skb(skb, bat_priv);
if (ret != 0)
goto dropped_freed;
}
bat_priv->stats.tx_packets++;
bat_priv->stats.tx_bytes += data_len;
goto end;
dropped:
kfree_skb(skb);
dropped_freed:
bat_priv->stats.tx_dropped++;
end:
if (primary_if)
hardif_free_ref(primary_if);
return NETDEV_TX_OK;
}
