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linux-sg2042/net/batman-adv/main.c

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/* Copyright (C) 2007-2015 B.A.T.M.A.N. contributors:
*
* Marek Lindner, Simon Wunderlich
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of version 2 of the GNU General Public
* License as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "main.h"
#include <linux/atomic.h>
#include <linux/bug.h>
#include <linux/byteorder/generic.h>
#include <linux/crc32c.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/if_ether.h>
#include <linux/if_vlan.h>
#include <linux/init.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/lockdep.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/netdevice.h>
#include <linux/pkt_sched.h>
#include <linux/rculist.h>
#include <linux/rcupdate.h>
#include <linux/seq_file.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/stddef.h>
#include <linux/string.h>
#include <linux/workqueue.h>
#include <net/dsfield.h>
#include <net/rtnetlink.h>
#include "bat_algo.h"
#include "bridge_loop_avoidance.h"
#include "debugfs.h"
#include "distributed-arp-table.h"
#include "gateway_client.h"
#include "gateway_common.h"
#include "hard-interface.h"
#include "icmp_socket.h"
#include "multicast.h"
#include "network-coding.h"
#include "originator.h"
#include "packet.h"
#include "routing.h"
#include "send.h"
#include "soft-interface.h"
#include "translation-table.h"
/* List manipulations on hardif_list have to be rtnl_lock()'ed,
* list traversals just rcu-locked
*/
struct list_head batadv_hardif_list;
static int (*batadv_rx_handler[256])(struct sk_buff *,
struct batadv_hard_iface *);
char batadv_routing_algo[20] = "BATMAN_IV";
static struct hlist_head batadv_algo_list;
unsigned char batadv_broadcast_addr[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
struct workqueue_struct *batadv_event_workqueue;
static void batadv_recv_handler_init(void);
static int __init batadv_init(void)
{
INIT_LIST_HEAD(&batadv_hardif_list);
INIT_HLIST_HEAD(&batadv_algo_list);
batadv_recv_handler_init();
batadv_iv_init();
batadv_nc_init();
batadv_event_workqueue = create_singlethread_workqueue("bat_events");
if (!batadv_event_workqueue)
return -ENOMEM;
batadv_socket_init();
batadv_debugfs_init();
register_netdevice_notifier(&batadv_hard_if_notifier);
rtnl_link_register(&batadv_link_ops);
pr_info("B.A.T.M.A.N. advanced %s (compatibility version %i) loaded\n",
BATADV_SOURCE_VERSION, BATADV_COMPAT_VERSION);
return 0;
}
static void __exit batadv_exit(void)
{
batadv_debugfs_destroy();
rtnl_link_unregister(&batadv_link_ops);
unregister_netdevice_notifier(&batadv_hard_if_notifier);
batadv_hardif_remove_interfaces();
flush_workqueue(batadv_event_workqueue);
destroy_workqueue(batadv_event_workqueue);
batadv_event_workqueue = NULL;
rcu_barrier();
}
int batadv_mesh_init(struct net_device *soft_iface)
{
struct batadv_priv *bat_priv = netdev_priv(soft_iface);
int ret;
spin_lock_init(&bat_priv->forw_bat_list_lock);
spin_lock_init(&bat_priv->forw_bcast_list_lock);
spin_lock_init(&bat_priv->tt.changes_list_lock);
spin_lock_init(&bat_priv->tt.req_list_lock);
spin_lock_init(&bat_priv->tt.roam_list_lock);
spin_lock_init(&bat_priv->tt.last_changeset_lock);
spin_lock_init(&bat_priv->tt.commit_lock);
spin_lock_init(&bat_priv->gw.list_lock);
#ifdef CONFIG_BATMAN_ADV_MCAST
spin_lock_init(&bat_priv->mcast.want_lists_lock);
#endif
spin_lock_init(&bat_priv->tvlv.container_list_lock);
spin_lock_init(&bat_priv->tvlv.handler_list_lock);
spin_lock_init(&bat_priv->softif_vlan_list_lock);
INIT_HLIST_HEAD(&bat_priv->forw_bat_list);
INIT_HLIST_HEAD(&bat_priv->forw_bcast_list);
INIT_HLIST_HEAD(&bat_priv->gw.list);
#ifdef CONFIG_BATMAN_ADV_MCAST
INIT_HLIST_HEAD(&bat_priv->mcast.want_all_unsnoopables_list);
INIT_HLIST_HEAD(&bat_priv->mcast.want_all_ipv4_list);
INIT_HLIST_HEAD(&bat_priv->mcast.want_all_ipv6_list);
#endif
INIT_LIST_HEAD(&bat_priv->tt.changes_list);
INIT_HLIST_HEAD(&bat_priv->tt.req_list);
INIT_LIST_HEAD(&bat_priv->tt.roam_list);
#ifdef CONFIG_BATMAN_ADV_MCAST
INIT_HLIST_HEAD(&bat_priv->mcast.mla_list);
#endif
INIT_HLIST_HEAD(&bat_priv->tvlv.container_list);
INIT_HLIST_HEAD(&bat_priv->tvlv.handler_list);
INIT_HLIST_HEAD(&bat_priv->softif_vlan_list);
ret = batadv_originator_init(bat_priv);
if (ret < 0)
goto err;
ret = batadv_tt_init(bat_priv);
if (ret < 0)
goto err;
ret = batadv_bla_init(bat_priv);
if (ret < 0)
goto err;
ret = batadv_dat_init(bat_priv);
if (ret < 0)
goto err;
ret = batadv_nc_mesh_init(bat_priv);
if (ret < 0)
goto err;
batadv_gw_init(bat_priv);
batadv_mcast_init(bat_priv);
atomic_set(&bat_priv->gw.reselect, 0);
atomic_set(&bat_priv->mesh_state, BATADV_MESH_ACTIVE);
return 0;
err:
batadv_mesh_free(soft_iface);
return ret;
}
void batadv_mesh_free(struct net_device *soft_iface)
{
struct batadv_priv *bat_priv = netdev_priv(soft_iface);
atomic_set(&bat_priv->mesh_state, BATADV_MESH_DEACTIVATING);
batadv_purge_outstanding_packets(bat_priv, NULL);
batadv_gw_node_free(bat_priv);
batadv_nc_mesh_free(bat_priv);
batadv_dat_free(bat_priv);
batadv_bla_free(bat_priv);
batadv_mcast_free(bat_priv);
/* Free the TT and the originator tables only after having terminated
* all the other depending components which may use these structures for
* their purposes.
*/
batadv_tt_free(bat_priv);
/* Since the originator table clean up routine is accessing the TT
* tables as well, it has to be invoked after the TT tables have been
* freed and marked as empty. This ensures that no cleanup RCU callbacks
* accessing the TT data are scheduled for later execution.
*/
batadv_originator_free(bat_priv);
batadv_gw_free(bat_priv);
free_percpu(bat_priv->bat_counters);
bat_priv->bat_counters = NULL;
atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE);
}
/**
* batadv_is_my_mac - check if the given mac address belongs to any of the real
* interfaces in the current mesh
* @bat_priv: the bat priv with all the soft interface information
* @addr: the address to check
*
* Returns 'true' if the mac address was found, false otherwise.
*/
bool batadv_is_my_mac(struct batadv_priv *bat_priv, const u8 *addr)
{
const struct batadv_hard_iface *hard_iface;
bool is_my_mac = false;
rcu_read_lock();
list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
if (hard_iface->if_status != BATADV_IF_ACTIVE)
continue;
if (hard_iface->soft_iface != bat_priv->soft_iface)
continue;
if (batadv_compare_eth(hard_iface->net_dev->dev_addr, addr)) {
is_my_mac = true;
break;
}
}
rcu_read_unlock();
return is_my_mac;
}
/**
* batadv_seq_print_text_primary_if_get - called from debugfs table printing
* function that requires the primary interface
* @seq: debugfs table seq_file struct
*
* Returns primary interface if found or NULL otherwise.
*/
struct batadv_hard_iface *
batadv_seq_print_text_primary_if_get(struct seq_file *seq)
{
struct net_device *net_dev = (struct net_device *)seq->private;
struct batadv_priv *bat_priv = netdev_priv(net_dev);
struct batadv_hard_iface *primary_if;
primary_if = batadv_primary_if_get_selected(bat_priv);
if (!primary_if) {
seq_printf(seq,
"BATMAN mesh %s disabled - please specify interfaces to enable it\n",
net_dev->name);
goto out;
}
if (primary_if->if_status == BATADV_IF_ACTIVE)
goto out;
seq_printf(seq,
"BATMAN mesh %s disabled - primary interface not active\n",
net_dev->name);
batadv_hardif_free_ref(primary_if);
primary_if = NULL;
out:
return primary_if;
}
/**
* batadv_max_header_len - calculate maximum encapsulation overhead for a
* payload packet
*
* Return the maximum encapsulation overhead in bytes.
*/
int batadv_max_header_len(void)
{
int header_len = 0;
header_len = max_t(int, header_len,
sizeof(struct batadv_unicast_packet));
header_len = max_t(int, header_len,
sizeof(struct batadv_unicast_4addr_packet));
header_len = max_t(int, header_len,
sizeof(struct batadv_bcast_packet));
#ifdef CONFIG_BATMAN_ADV_NC
header_len = max_t(int, header_len,
sizeof(struct batadv_coded_packet));
#endif
return header_len + ETH_HLEN;
}
/**
* batadv_skb_set_priority - sets skb priority according to packet content
* @skb: the packet to be sent
* @offset: offset to the packet content
*
* This function sets a value between 256 and 263 (802.1d priority), which
* can be interpreted by the cfg80211 or other drivers.
*/
void batadv_skb_set_priority(struct sk_buff *skb, int offset)
{
struct iphdr ip_hdr_tmp, *ip_hdr;
struct ipv6hdr ip6_hdr_tmp, *ip6_hdr;
struct ethhdr ethhdr_tmp, *ethhdr;
struct vlan_ethhdr *vhdr, vhdr_tmp;
u32 prio;
/* already set, do nothing */
if (skb->priority >= 256 && skb->priority <= 263)
return;
ethhdr = skb_header_pointer(skb, offset, sizeof(*ethhdr), &ethhdr_tmp);
if (!ethhdr)
return;
switch (ethhdr->h_proto) {
case htons(ETH_P_8021Q):
vhdr = skb_header_pointer(skb, offset + sizeof(*vhdr),
sizeof(*vhdr), &vhdr_tmp);
if (!vhdr)
return;
prio = ntohs(vhdr->h_vlan_TCI) & VLAN_PRIO_MASK;
prio = prio >> VLAN_PRIO_SHIFT;
break;
case htons(ETH_P_IP):
ip_hdr = skb_header_pointer(skb, offset + sizeof(*ethhdr),
sizeof(*ip_hdr), &ip_hdr_tmp);
if (!ip_hdr)
return;
prio = (ipv4_get_dsfield(ip_hdr) & 0xfc) >> 5;
break;
case htons(ETH_P_IPV6):
ip6_hdr = skb_header_pointer(skb, offset + sizeof(*ethhdr),
sizeof(*ip6_hdr), &ip6_hdr_tmp);
if (!ip6_hdr)
return;
prio = (ipv6_get_dsfield(ip6_hdr) & 0xfc) >> 5;
break;
default:
return;
}
skb->priority = prio + 256;
}
static int batadv_recv_unhandled_packet(struct sk_buff *skb,
struct batadv_hard_iface *recv_if)
{
return NET_RX_DROP;
}
/* incoming packets with the batman ethertype received on any active hard
* interface
*/
int batadv_batman_skb_recv(struct sk_buff *skb, struct net_device *dev,
struct packet_type *ptype,
struct net_device *orig_dev)
{
struct batadv_priv *bat_priv;
struct batadv_ogm_packet *batadv_ogm_packet;
struct batadv_hard_iface *hard_iface;
u8 idx;
int ret;
hard_iface = container_of(ptype, struct batadv_hard_iface,
batman_adv_ptype);
skb = skb_share_check(skb, GFP_ATOMIC);
/* skb was released by skb_share_check() */
if (!skb)
goto err_out;
/* packet should hold at least type and version */
if (unlikely(!pskb_may_pull(skb, 2)))
goto err_free;
/* expect a valid ethernet header here. */
if (unlikely(skb->mac_len != ETH_HLEN || !skb_mac_header(skb)))
goto err_free;
if (!hard_iface->soft_iface)
goto err_free;
bat_priv = netdev_priv(hard_iface->soft_iface);
if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
goto err_free;
/* discard frames on not active interfaces */
if (hard_iface->if_status != BATADV_IF_ACTIVE)
goto err_free;
batadv_ogm_packet = (struct batadv_ogm_packet *)skb->data;
if (batadv_ogm_packet->version != BATADV_COMPAT_VERSION) {
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
"Drop packet: incompatible batman version (%i)\n",
batadv_ogm_packet->version);
goto err_free;
}
/* reset control block to avoid left overs from previous users */
memset(skb->cb, 0, sizeof(struct batadv_skb_cb));
/* all receive handlers return whether they received or reused
* the supplied skb. if not, we have to free the skb.
*/
idx = batadv_ogm_packet->packet_type;
ret = (*batadv_rx_handler[idx])(skb, hard_iface);
if (ret == NET_RX_DROP)
kfree_skb(skb);
/* return NET_RX_SUCCESS in any case as we
* most probably dropped the packet for
* routing-logical reasons.
*/
return NET_RX_SUCCESS;
err_free:
kfree_skb(skb);
err_out:
return NET_RX_DROP;
}
static void batadv_recv_handler_init(void)
{
int i;
for (i = 0; i < ARRAY_SIZE(batadv_rx_handler); i++)
batadv_rx_handler[i] = batadv_recv_unhandled_packet;
for (i = BATADV_UNICAST_MIN; i <= BATADV_UNICAST_MAX; i++)
batadv_rx_handler[i] = batadv_recv_unhandled_unicast_packet;
/* compile time checks for sizes */
BUILD_BUG_ON(sizeof(struct batadv_bla_claim_dst) != 6);
BUILD_BUG_ON(sizeof(struct batadv_ogm_packet) != 24);
BUILD_BUG_ON(sizeof(struct batadv_icmp_header) != 20);
BUILD_BUG_ON(sizeof(struct batadv_icmp_packet) != 20);
BUILD_BUG_ON(sizeof(struct batadv_icmp_packet_rr) != 116);
BUILD_BUG_ON(sizeof(struct batadv_unicast_packet) != 10);
BUILD_BUG_ON(sizeof(struct batadv_unicast_4addr_packet) != 18);
BUILD_BUG_ON(sizeof(struct batadv_frag_packet) != 20);
BUILD_BUG_ON(sizeof(struct batadv_bcast_packet) != 14);
BUILD_BUG_ON(sizeof(struct batadv_coded_packet) != 46);
BUILD_BUG_ON(sizeof(struct batadv_unicast_tvlv_packet) != 20);
BUILD_BUG_ON(sizeof(struct batadv_tvlv_hdr) != 4);
BUILD_BUG_ON(sizeof(struct batadv_tvlv_gateway_data) != 8);
BUILD_BUG_ON(sizeof(struct batadv_tvlv_tt_vlan_data) != 8);
BUILD_BUG_ON(sizeof(struct batadv_tvlv_tt_change) != 12);
BUILD_BUG_ON(sizeof(struct batadv_tvlv_roam_adv) != 8);
/* broadcast packet */
batadv_rx_handler[BATADV_BCAST] = batadv_recv_bcast_packet;
/* unicast packets ... */
/* unicast with 4 addresses packet */
batadv_rx_handler[BATADV_UNICAST_4ADDR] = batadv_recv_unicast_packet;
/* unicast packet */
batadv_rx_handler[BATADV_UNICAST] = batadv_recv_unicast_packet;
/* unicast tvlv packet */
batadv_rx_handler[BATADV_UNICAST_TVLV] = batadv_recv_unicast_tvlv;
/* batman icmp packet */
batadv_rx_handler[BATADV_ICMP] = batadv_recv_icmp_packet;
/* Fragmented packets */
batadv_rx_handler[BATADV_UNICAST_FRAG] = batadv_recv_frag_packet;
}
int
batadv_recv_handler_register(u8 packet_type,
int (*recv_handler)(struct sk_buff *,
struct batadv_hard_iface *))
{
int (*curr)(struct sk_buff *,
struct batadv_hard_iface *);
curr = batadv_rx_handler[packet_type];
if ((curr != batadv_recv_unhandled_packet) &&
(curr != batadv_recv_unhandled_unicast_packet))
return -EBUSY;
batadv_rx_handler[packet_type] = recv_handler;
return 0;
}
void batadv_recv_handler_unregister(u8 packet_type)
{
batadv_rx_handler[packet_type] = batadv_recv_unhandled_packet;
}
static struct batadv_algo_ops *batadv_algo_get(char *name)
{
struct batadv_algo_ops *bat_algo_ops = NULL, *bat_algo_ops_tmp;
hlist_for_each_entry(bat_algo_ops_tmp, &batadv_algo_list, list) {
if (strcmp(bat_algo_ops_tmp->name, name) != 0)
continue;
bat_algo_ops = bat_algo_ops_tmp;
break;
}
return bat_algo_ops;
}
int batadv_algo_register(struct batadv_algo_ops *bat_algo_ops)
{
struct batadv_algo_ops *bat_algo_ops_tmp;
bat_algo_ops_tmp = batadv_algo_get(bat_algo_ops->name);
if (bat_algo_ops_tmp) {
pr_info("Trying to register already registered routing algorithm: %s\n",
bat_algo_ops->name);
return -EEXIST;
}
/* all algorithms must implement all ops (for now) */
if (!bat_algo_ops->bat_iface_enable ||
!bat_algo_ops->bat_iface_disable ||
!bat_algo_ops->bat_iface_update_mac ||
!bat_algo_ops->bat_primary_iface_set ||
!bat_algo_ops->bat_ogm_schedule ||
!bat_algo_ops->bat_ogm_emit ||
!bat_algo_ops->bat_neigh_cmp ||
!bat_algo_ops->bat_neigh_is_similar_or_better) {
pr_info("Routing algo '%s' does not implement required ops\n",
bat_algo_ops->name);
return -EINVAL;
}
INIT_HLIST_NODE(&bat_algo_ops->list);
hlist_add_head(&bat_algo_ops->list, &batadv_algo_list);
return 0;
}
int batadv_algo_select(struct batadv_priv *bat_priv, char *name)
{
struct batadv_algo_ops *bat_algo_ops;
bat_algo_ops = batadv_algo_get(name);
if (!bat_algo_ops)
return -EINVAL;
bat_priv->bat_algo_ops = bat_algo_ops;
return 0;
}
int batadv_algo_seq_print_text(struct seq_file *seq, void *offset)
{
struct batadv_algo_ops *bat_algo_ops;
seq_puts(seq, "Available routing algorithms:\n");
hlist_for_each_entry(bat_algo_ops, &batadv_algo_list, list) {
seq_printf(seq, " * %s\n", bat_algo_ops->name);
}
return 0;
}
/**
* batadv_skb_crc32 - calculate CRC32 of the whole packet and skip bytes in
* the header
* @skb: skb pointing to fragmented socket buffers
* @payload_ptr: Pointer to position inside the head buffer of the skb
* marking the start of the data to be CRC'ed
*
* payload_ptr must always point to an address in the skb head buffer and not to
* a fragment.
*/
__be32 batadv_skb_crc32(struct sk_buff *skb, u8 *payload_ptr)
{
u32 crc = 0;
unsigned int from;
unsigned int to = skb->len;
struct skb_seq_state st;
const u8 *data;
unsigned int len;
unsigned int consumed = 0;
from = (unsigned int)(payload_ptr - skb->data);
skb_prepare_seq_read(skb, from, to, &st);
while ((len = skb_seq_read(consumed, &data, &st)) != 0) {
crc = crc32c(crc, data, len);
consumed += len;
}
return htonl(crc);
}
/**
* batadv_tvlv_handler_free_ref - decrement the tvlv handler refcounter and
* possibly free it
* @tvlv_handler: the tvlv handler to free
*/
static void
batadv_tvlv_handler_free_ref(struct batadv_tvlv_handler *tvlv_handler)
{
if (atomic_dec_and_test(&tvlv_handler->refcount))
kfree_rcu(tvlv_handler, rcu);
}
/**
* batadv_tvlv_handler_get - retrieve tvlv handler from the tvlv handler list
* based on the provided type and version (both need to match)
* @bat_priv: the bat priv with all the soft interface information
* @type: tvlv handler type to look for
* @version: tvlv handler version to look for
*
* Returns tvlv handler if found or NULL otherwise.
*/
static struct batadv_tvlv_handler
*batadv_tvlv_handler_get(struct batadv_priv *bat_priv, u8 type, u8 version)
{
struct batadv_tvlv_handler *tvlv_handler_tmp, *tvlv_handler = NULL;
rcu_read_lock();
hlist_for_each_entry_rcu(tvlv_handler_tmp,
&bat_priv->tvlv.handler_list, list) {
if (tvlv_handler_tmp->type != type)
continue;
if (tvlv_handler_tmp->version != version)
continue;
if (!atomic_inc_not_zero(&tvlv_handler_tmp->refcount))
continue;
tvlv_handler = tvlv_handler_tmp;
break;
}
rcu_read_unlock();
return tvlv_handler;
}
/**
* batadv_tvlv_container_free_ref - decrement the tvlv container refcounter and
* possibly free it
* @tvlv: the tvlv container to free
*/
static void batadv_tvlv_container_free_ref(struct batadv_tvlv_container *tvlv)
{
if (atomic_dec_and_test(&tvlv->refcount))
kfree(tvlv);
}
/**
* batadv_tvlv_container_get - retrieve tvlv container from the tvlv container
* list based on the provided type and version (both need to match)
* @bat_priv: the bat priv with all the soft interface information
* @type: tvlv container type to look for
* @version: tvlv container version to look for
*
* Has to be called with the appropriate locks being acquired
* (tvlv.container_list_lock).
*
* Returns tvlv container if found or NULL otherwise.
*/
static struct batadv_tvlv_container
*batadv_tvlv_container_get(struct batadv_priv *bat_priv, u8 type, u8 version)
{
struct batadv_tvlv_container *tvlv_tmp, *tvlv = NULL;
hlist_for_each_entry(tvlv_tmp, &bat_priv->tvlv.container_list, list) {
if (tvlv_tmp->tvlv_hdr.type != type)
continue;
if (tvlv_tmp->tvlv_hdr.version != version)
continue;
if (!atomic_inc_not_zero(&tvlv_tmp->refcount))
continue;
tvlv = tvlv_tmp;
break;
}
return tvlv;
}
/**
* batadv_tvlv_container_list_size - calculate the size of the tvlv container
* list entries
* @bat_priv: the bat priv with all the soft interface information
*
* Has to be called with the appropriate locks being acquired
* (tvlv.container_list_lock).
*
* Returns size of all currently registered tvlv containers in bytes.
*/
static u16 batadv_tvlv_container_list_size(struct batadv_priv *bat_priv)
{
struct batadv_tvlv_container *tvlv;
u16 tvlv_len = 0;
hlist_for_each_entry(tvlv, &bat_priv->tvlv.container_list, list) {
tvlv_len += sizeof(struct batadv_tvlv_hdr);
tvlv_len += ntohs(tvlv->tvlv_hdr.len);
}
return tvlv_len;
}
/**
* batadv_tvlv_container_remove - remove tvlv container from the tvlv container
* list
* @bat_priv: the bat priv with all the soft interface information
* @tvlv: the to be removed tvlv container
*
* Has to be called with the appropriate locks being acquired
* (tvlv.container_list_lock).
*/
static void batadv_tvlv_container_remove(struct batadv_priv *bat_priv,
struct batadv_tvlv_container *tvlv)
{
lockdep_assert_held(&bat_priv->tvlv.container_list_lock);
if (!tvlv)
return;
hlist_del(&tvlv->list);
/* first call to decrement the counter, second call to free */
batadv_tvlv_container_free_ref(tvlv);
batadv_tvlv_container_free_ref(tvlv);
}
/**
* batadv_tvlv_container_unregister - unregister tvlv container based on the
* provided type and version (both need to match)
* @bat_priv: the bat priv with all the soft interface information
* @type: tvlv container type to unregister
* @version: tvlv container type to unregister
*/
void batadv_tvlv_container_unregister(struct batadv_priv *bat_priv,
u8 type, u8 version)
{
struct batadv_tvlv_container *tvlv;
spin_lock_bh(&bat_priv->tvlv.container_list_lock);
tvlv = batadv_tvlv_container_get(bat_priv, type, version);
batadv_tvlv_container_remove(bat_priv, tvlv);
spin_unlock_bh(&bat_priv->tvlv.container_list_lock);
}
/**
* batadv_tvlv_container_register - register tvlv type, version and content
* to be propagated with each (primary interface) OGM
* @bat_priv: the bat priv with all the soft interface information
* @type: tvlv container type
* @version: tvlv container version
* @tvlv_value: tvlv container content
* @tvlv_value_len: tvlv container content length
*
* If a container of the same type and version was already registered the new
* content is going to replace the old one.
*/
void batadv_tvlv_container_register(struct batadv_priv *bat_priv,
u8 type, u8 version,
void *tvlv_value, u16 tvlv_value_len)
{
struct batadv_tvlv_container *tvlv_old, *tvlv_new;
if (!tvlv_value)
tvlv_value_len = 0;
tvlv_new = kzalloc(sizeof(*tvlv_new) + tvlv_value_len, GFP_ATOMIC);
if (!tvlv_new)
return;
tvlv_new->tvlv_hdr.version = version;
tvlv_new->tvlv_hdr.type = type;
tvlv_new->tvlv_hdr.len = htons(tvlv_value_len);
memcpy(tvlv_new + 1, tvlv_value, ntohs(tvlv_new->tvlv_hdr.len));
INIT_HLIST_NODE(&tvlv_new->list);
atomic_set(&tvlv_new->refcount, 1);
spin_lock_bh(&bat_priv->tvlv.container_list_lock);
tvlv_old = batadv_tvlv_container_get(bat_priv, type, version);
batadv_tvlv_container_remove(bat_priv, tvlv_old);
hlist_add_head(&tvlv_new->list, &bat_priv->tvlv.container_list);
spin_unlock_bh(&bat_priv->tvlv.container_list_lock);
}
/**
* batadv_tvlv_realloc_packet_buff - reallocate packet buffer to accommodate
* requested packet size
* @packet_buff: packet buffer
* @packet_buff_len: packet buffer size
* @min_packet_len: requested packet minimum size
* @additional_packet_len: requested additional packet size on top of minimum
* size
*
* Returns true of the packet buffer could be changed to the requested size,
* false otherwise.
*/
static bool batadv_tvlv_realloc_packet_buff(unsigned char **packet_buff,
int *packet_buff_len,
int min_packet_len,
int additional_packet_len)
{
unsigned char *new_buff;
new_buff = kmalloc(min_packet_len + additional_packet_len, GFP_ATOMIC);
/* keep old buffer if kmalloc should fail */
if (!new_buff)
return false;
memcpy(new_buff, *packet_buff, min_packet_len);
kfree(*packet_buff);
*packet_buff = new_buff;
*packet_buff_len = min_packet_len + additional_packet_len;
return true;
}
/**
* batadv_tvlv_container_ogm_append - append tvlv container content to given
* OGM packet buffer
* @bat_priv: the bat priv with all the soft interface information
* @packet_buff: ogm packet buffer
* @packet_buff_len: ogm packet buffer size including ogm header and tvlv
* content
* @packet_min_len: ogm header size to be preserved for the OGM itself
*
* The ogm packet might be enlarged or shrunk depending on the current size
* and the size of the to-be-appended tvlv containers.
*
* Returns size of all appended tvlv containers in bytes.
*/
u16 batadv_tvlv_container_ogm_append(struct batadv_priv *bat_priv,
unsigned char **packet_buff,
int *packet_buff_len, int packet_min_len)
{
struct batadv_tvlv_container *tvlv;
struct batadv_tvlv_hdr *tvlv_hdr;
u16 tvlv_value_len;
void *tvlv_value;
bool ret;
spin_lock_bh(&bat_priv->tvlv.container_list_lock);
tvlv_value_len = batadv_tvlv_container_list_size(bat_priv);
ret = batadv_tvlv_realloc_packet_buff(packet_buff, packet_buff_len,
packet_min_len, tvlv_value_len);
if (!ret)
goto end;
if (!tvlv_value_len)
goto end;
tvlv_value = (*packet_buff) + packet_min_len;
hlist_for_each_entry(tvlv, &bat_priv->tvlv.container_list, list) {
tvlv_hdr = tvlv_value;
tvlv_hdr->type = tvlv->tvlv_hdr.type;
tvlv_hdr->version = tvlv->tvlv_hdr.version;
tvlv_hdr->len = tvlv->tvlv_hdr.len;
tvlv_value = tvlv_hdr + 1;
memcpy(tvlv_value, tvlv + 1, ntohs(tvlv->tvlv_hdr.len));
tvlv_value = (u8 *)tvlv_value + ntohs(tvlv->tvlv_hdr.len);
}
end:
spin_unlock_bh(&bat_priv->tvlv.container_list_lock);
return tvlv_value_len;
}
/**
* batadv_tvlv_call_handler - parse the given tvlv buffer to call the
* appropriate handlers
* @bat_priv: the bat priv with all the soft interface information
* @tvlv_handler: tvlv callback function handling the tvlv content
* @ogm_source: flag indicating whether the tvlv is an ogm or a unicast packet
* @orig_node: orig node emitting the ogm packet
* @src: source mac address of the unicast packet
* @dst: destination mac address of the unicast packet
* @tvlv_value: tvlv content
* @tvlv_value_len: tvlv content length
*
* Returns success if handler was not found or the return value of the handler
* callback.
*/
static int batadv_tvlv_call_handler(struct batadv_priv *bat_priv,
struct batadv_tvlv_handler *tvlv_handler,
bool ogm_source,
struct batadv_orig_node *orig_node,
u8 *src, u8 *dst,
void *tvlv_value, u16 tvlv_value_len)
{
if (!tvlv_handler)
return NET_RX_SUCCESS;
if (ogm_source) {
if (!tvlv_handler->ogm_handler)
return NET_RX_SUCCESS;
if (!orig_node)
return NET_RX_SUCCESS;
tvlv_handler->ogm_handler(bat_priv, orig_node,
BATADV_NO_FLAGS,
tvlv_value, tvlv_value_len);
tvlv_handler->flags |= BATADV_TVLV_HANDLER_OGM_CALLED;
} else {
if (!src)
return NET_RX_SUCCESS;
if (!dst)
return NET_RX_SUCCESS;
if (!tvlv_handler->unicast_handler)
return NET_RX_SUCCESS;
return tvlv_handler->unicast_handler(bat_priv, src,
dst, tvlv_value,
tvlv_value_len);
}
return NET_RX_SUCCESS;
}
/**
* batadv_tvlv_containers_process - parse the given tvlv buffer to call the
* appropriate handlers
* @bat_priv: the bat priv with all the soft interface information
* @ogm_source: flag indicating whether the tvlv is an ogm or a unicast packet
* @orig_node: orig node emitting the ogm packet
* @src: source mac address of the unicast packet
* @dst: destination mac address of the unicast packet
* @tvlv_value: tvlv content
* @tvlv_value_len: tvlv content length
*
* Returns success when processing an OGM or the return value of all called
* handler callbacks.
*/
int batadv_tvlv_containers_process(struct batadv_priv *bat_priv,
bool ogm_source,
struct batadv_orig_node *orig_node,
u8 *src, u8 *dst,
void *tvlv_value, u16 tvlv_value_len)
{
struct batadv_tvlv_handler *tvlv_handler;
struct batadv_tvlv_hdr *tvlv_hdr;
u16 tvlv_value_cont_len;
u8 cifnotfound = BATADV_TVLV_HANDLER_OGM_CIFNOTFND;
int ret = NET_RX_SUCCESS;
while (tvlv_value_len >= sizeof(*tvlv_hdr)) {
tvlv_hdr = tvlv_value;
tvlv_value_cont_len = ntohs(tvlv_hdr->len);
tvlv_value = tvlv_hdr + 1;
tvlv_value_len -= sizeof(*tvlv_hdr);
if (tvlv_value_cont_len > tvlv_value_len)
break;
tvlv_handler = batadv_tvlv_handler_get(bat_priv,
tvlv_hdr->type,
tvlv_hdr->version);
ret |= batadv_tvlv_call_handler(bat_priv, tvlv_handler,
ogm_source, orig_node,
src, dst, tvlv_value,
tvlv_value_cont_len);
if (tvlv_handler)
batadv_tvlv_handler_free_ref(tvlv_handler);
tvlv_value = (u8 *)tvlv_value + tvlv_value_cont_len;
tvlv_value_len -= tvlv_value_cont_len;
}
if (!ogm_source)
return ret;
rcu_read_lock();
hlist_for_each_entry_rcu(tvlv_handler,
&bat_priv->tvlv.handler_list, list) {
if ((tvlv_handler->flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND) &&
!(tvlv_handler->flags & BATADV_TVLV_HANDLER_OGM_CALLED))
tvlv_handler->ogm_handler(bat_priv, orig_node,
cifnotfound, NULL, 0);
tvlv_handler->flags &= ~BATADV_TVLV_HANDLER_OGM_CALLED;
}
rcu_read_unlock();
return NET_RX_SUCCESS;
}
/**
* batadv_tvlv_ogm_receive - process an incoming ogm and call the appropriate
* handlers
* @bat_priv: the bat priv with all the soft interface information
* @batadv_ogm_packet: ogm packet containing the tvlv containers
* @orig_node: orig node emitting the ogm packet
*/
void batadv_tvlv_ogm_receive(struct batadv_priv *bat_priv,
struct batadv_ogm_packet *batadv_ogm_packet,
struct batadv_orig_node *orig_node)
{
void *tvlv_value;
u16 tvlv_value_len;
if (!batadv_ogm_packet)
return;
tvlv_value_len = ntohs(batadv_ogm_packet->tvlv_len);
if (!tvlv_value_len)
return;
tvlv_value = batadv_ogm_packet + 1;
batadv_tvlv_containers_process(bat_priv, true, orig_node, NULL, NULL,
tvlv_value, tvlv_value_len);
}
/**
* batadv_tvlv_handler_register - register tvlv handler based on the provided
* type and version (both need to match) for ogm tvlv payload and/or unicast
* payload
* @bat_priv: the bat priv with all the soft interface information
* @optr: ogm tvlv handler callback function. This function receives the orig
* node, flags and the tvlv content as argument to process.
* @uptr: unicast tvlv handler callback function. This function receives the
* source & destination of the unicast packet as well as the tvlv content
* to process.
* @type: tvlv handler type to be registered
* @version: tvlv handler version to be registered
* @flags: flags to enable or disable TVLV API behavior
*/
void batadv_tvlv_handler_register(struct batadv_priv *bat_priv,
void (*optr)(struct batadv_priv *bat_priv,
struct batadv_orig_node *orig,
u8 flags,
void *tvlv_value,
u16 tvlv_value_len),
int (*uptr)(struct batadv_priv *bat_priv,
u8 *src, u8 *dst,
void *tvlv_value,
u16 tvlv_value_len),
u8 type, u8 version, u8 flags)
{
struct batadv_tvlv_handler *tvlv_handler;
tvlv_handler = batadv_tvlv_handler_get(bat_priv, type, version);
if (tvlv_handler) {
batadv_tvlv_handler_free_ref(tvlv_handler);
return;
}
tvlv_handler = kzalloc(sizeof(*tvlv_handler), GFP_ATOMIC);
if (!tvlv_handler)
return;
tvlv_handler->ogm_handler = optr;
tvlv_handler->unicast_handler = uptr;
tvlv_handler->type = type;
tvlv_handler->version = version;
tvlv_handler->flags = flags;
atomic_set(&tvlv_handler->refcount, 1);
INIT_HLIST_NODE(&tvlv_handler->list);
spin_lock_bh(&bat_priv->tvlv.handler_list_lock);
hlist_add_head_rcu(&tvlv_handler->list, &bat_priv->tvlv.handler_list);
spin_unlock_bh(&bat_priv->tvlv.handler_list_lock);
}
/**
* batadv_tvlv_handler_unregister - unregister tvlv handler based on the
* provided type and version (both need to match)
* @bat_priv: the bat priv with all the soft interface information
* @type: tvlv handler type to be unregistered
* @version: tvlv handler version to be unregistered
*/
void batadv_tvlv_handler_unregister(struct batadv_priv *bat_priv,
u8 type, u8 version)
{
struct batadv_tvlv_handler *tvlv_handler;
tvlv_handler = batadv_tvlv_handler_get(bat_priv, type, version);
if (!tvlv_handler)
return;
batadv_tvlv_handler_free_ref(tvlv_handler);
spin_lock_bh(&bat_priv->tvlv.handler_list_lock);
hlist_del_rcu(&tvlv_handler->list);
spin_unlock_bh(&bat_priv->tvlv.handler_list_lock);
batadv_tvlv_handler_free_ref(tvlv_handler);
}
/**
* batadv_tvlv_unicast_send - send a unicast packet with tvlv payload to the
* specified host
* @bat_priv: the bat priv with all the soft interface information
* @src: source mac address of the unicast packet
* @dst: destination mac address of the unicast packet
* @type: tvlv type
* @version: tvlv version
* @tvlv_value: tvlv content
* @tvlv_value_len: tvlv content length
*/
void batadv_tvlv_unicast_send(struct batadv_priv *bat_priv, u8 *src,
u8 *dst, u8 type, u8 version,
void *tvlv_value, u16 tvlv_value_len)
{
struct batadv_unicast_tvlv_packet *unicast_tvlv_packet;
struct batadv_tvlv_hdr *tvlv_hdr;
struct batadv_orig_node *orig_node;
struct sk_buff *skb;
unsigned char *tvlv_buff;
unsigned int tvlv_len;
ssize_t hdr_len = sizeof(*unicast_tvlv_packet);
orig_node = batadv_orig_hash_find(bat_priv, dst);
if (!orig_node)
return;
tvlv_len = sizeof(*tvlv_hdr) + tvlv_value_len;
skb = netdev_alloc_skb_ip_align(NULL, ETH_HLEN + hdr_len + tvlv_len);
if (!skb)
goto out;
skb->priority = TC_PRIO_CONTROL;
skb_reserve(skb, ETH_HLEN);
tvlv_buff = skb_put(skb, sizeof(*unicast_tvlv_packet) + tvlv_len);
unicast_tvlv_packet = (struct batadv_unicast_tvlv_packet *)tvlv_buff;
unicast_tvlv_packet->packet_type = BATADV_UNICAST_TVLV;
unicast_tvlv_packet->version = BATADV_COMPAT_VERSION;
unicast_tvlv_packet->ttl = BATADV_TTL;
unicast_tvlv_packet->reserved = 0;
unicast_tvlv_packet->tvlv_len = htons(tvlv_len);
unicast_tvlv_packet->align = 0;
ether_addr_copy(unicast_tvlv_packet->src, src);
ether_addr_copy(unicast_tvlv_packet->dst, dst);
tvlv_buff = (unsigned char *)(unicast_tvlv_packet + 1);
tvlv_hdr = (struct batadv_tvlv_hdr *)tvlv_buff;
tvlv_hdr->version = version;
tvlv_hdr->type = type;
tvlv_hdr->len = htons(tvlv_value_len);
tvlv_buff += sizeof(*tvlv_hdr);
memcpy(tvlv_buff, tvlv_value, tvlv_value_len);
if (batadv_send_skb_to_orig(skb, orig_node, NULL) == NET_XMIT_DROP)
kfree_skb(skb);
out:
batadv_orig_node_free_ref(orig_node);
}
/**
* batadv_get_vid - extract the VLAN identifier from skb if any
* @skb: the buffer containing the packet
* @header_len: length of the batman header preceding the ethernet header
*
* If the packet embedded in the skb is vlan tagged this function returns the
* VID with the BATADV_VLAN_HAS_TAG flag. Otherwise BATADV_NO_FLAGS is returned.
*/
unsigned short batadv_get_vid(struct sk_buff *skb, size_t header_len)
{
struct ethhdr *ethhdr = (struct ethhdr *)(skb->data + header_len);
struct vlan_ethhdr *vhdr;
unsigned short vid;
if (ethhdr->h_proto != htons(ETH_P_8021Q))
return BATADV_NO_FLAGS;
if (!pskb_may_pull(skb, header_len + VLAN_ETH_HLEN))
return BATADV_NO_FLAGS;
vhdr = (struct vlan_ethhdr *)(skb->data + header_len);
vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;
vid |= BATADV_VLAN_HAS_TAG;
return vid;
}
/**
* batadv_vlan_ap_isola_get - return the AP isolation status for the given vlan
* @bat_priv: the bat priv with all the soft interface information
* @vid: the VLAN identifier for which the AP isolation attributed as to be
* looked up
*
* Returns true if AP isolation is on for the VLAN idenfied by vid, false
* otherwise
*/
bool batadv_vlan_ap_isola_get(struct batadv_priv *bat_priv, unsigned short vid)
{
bool ap_isolation_enabled = false;
struct batadv_softif_vlan *vlan;
/* if the AP isolation is requested on a VLAN, then check for its
* setting in the proper VLAN private data structure
*/
vlan = batadv_softif_vlan_get(bat_priv, vid);
if (vlan) {
ap_isolation_enabled = atomic_read(&vlan->ap_isolation);
batadv_softif_vlan_free_ref(vlan);
}
return ap_isolation_enabled;
}
static int batadv_param_set_ra(const char *val, const struct kernel_param *kp)
{
struct batadv_algo_ops *bat_algo_ops;
char *algo_name = (char *)val;
size_t name_len = strlen(algo_name);
if (name_len > 0 && algo_name[name_len - 1] == '\n')
algo_name[name_len - 1] = '\0';
bat_algo_ops = batadv_algo_get(algo_name);
if (!bat_algo_ops) {
pr_err("Routing algorithm '%s' is not supported\n", algo_name);
return -EINVAL;
}
return param_set_copystring(algo_name, kp);
}
static const struct kernel_param_ops batadv_param_ops_ra = {
.set = batadv_param_set_ra,
.get = param_get_string,
};
static struct kparam_string batadv_param_string_ra = {
.maxlen = sizeof(batadv_routing_algo),
.string = batadv_routing_algo,
};
module_param_cb(routing_algo, &batadv_param_ops_ra, &batadv_param_string_ra,
0644);
module_init(batadv_init);
module_exit(batadv_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR(BATADV_DRIVER_AUTHOR);
MODULE_DESCRIPTION(BATADV_DRIVER_DESC);
MODULE_SUPPORTED_DEVICE(BATADV_DRIVER_DEVICE);
MODULE_VERSION(BATADV_SOURCE_VERSION);
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