diff options
| -rw-r--r-- | net/batman-adv/Makefile | 1 | ||||
| -rw-r--r-- | net/batman-adv/bat_iv_ogm.c | 1 | ||||
| -rw-r--r-- | net/batman-adv/bat_v_ogm.c | 1 | ||||
| -rw-r--r-- | net/batman-adv/distributed-arp-table.c | 1 | ||||
| -rw-r--r-- | net/batman-adv/gateway_common.c | 1 | ||||
| -rw-r--r-- | net/batman-adv/main.c | 591 | ||||
| -rw-r--r-- | net/batman-adv/main.h | 34 | ||||
| -rw-r--r-- | net/batman-adv/multicast.c | 1 | ||||
| -rw-r--r-- | net/batman-adv/network-coding.c | 1 | ||||
| -rw-r--r-- | net/batman-adv/routing.c | 1 | ||||
| -rw-r--r-- | net/batman-adv/translation-table.c | 1 | ||||
| -rw-r--r-- | net/batman-adv/tvlv.c | 630 | ||||
| -rw-r--r-- | net/batman-adv/tvlv.h | 61 |
13 files changed, 700 insertions, 625 deletions
diff --git a/net/batman-adv/Makefile b/net/batman-adv/Makefile index 797cf2fc88c1..5c6ece0cfc17 100644 --- a/net/batman-adv/Makefile +++ b/net/batman-adv/Makefile @@ -40,3 +40,4 @@ batman-adv-y += send.o batman-adv-y += soft-interface.o batman-adv-y += sysfs.o batman-adv-y += translation-table.o +batman-adv-y += tvlv.o diff --git a/net/batman-adv/bat_iv_ogm.c b/net/batman-adv/bat_iv_ogm.c index 6dc89b0eb01a..948a5b45474d 100644 --- a/net/batman-adv/bat_iv_ogm.c +++ b/net/batman-adv/bat_iv_ogm.c @@ -58,6 +58,7 @@ #include "routing.h" #include "send.h" #include "translation-table.h" +#include "tvlv.h" static void batadv_iv_send_outstanding_bat_ogm_packet(struct work_struct *work); diff --git a/net/batman-adv/bat_v_ogm.c b/net/batman-adv/bat_v_ogm.c index 23ea9bfb9f67..ca5a679d112f 100644 --- a/net/batman-adv/bat_v_ogm.c +++ b/net/batman-adv/bat_v_ogm.c @@ -46,6 +46,7 @@ #include "routing.h" #include "send.h" #include "translation-table.h" +#include "tvlv.h" /** * batadv_v_ogm_orig_get - retrieve and possibly create an originator node diff --git a/net/batman-adv/distributed-arp-table.c b/net/batman-adv/distributed-arp-table.c index 278800a99c69..584b82744699 100644 --- a/net/batman-adv/distributed-arp-table.c +++ b/net/batman-adv/distributed-arp-table.c @@ -48,6 +48,7 @@ #include "originator.h" #include "send.h" #include "translation-table.h" +#include "tvlv.h" static void batadv_dat_purge(struct work_struct *work); diff --git a/net/batman-adv/gateway_common.c b/net/batman-adv/gateway_common.c index 7754435611eb..6a6f2d4987e5 100644 --- a/net/batman-adv/gateway_common.c +++ b/net/batman-adv/gateway_common.c @@ -29,6 +29,7 @@ #include "gateway_client.h" #include "packet.h" +#include "tvlv.h" /** * batadv_parse_throughput - parse supplied string buffer to extract throughput diff --git a/net/batman-adv/main.c b/net/batman-adv/main.c index 627d14ececaf..225d63e0c711 100644 --- a/net/batman-adv/main.c +++ b/net/batman-adv/main.c @@ -31,16 +31,13 @@ #include <linux/kernel.h> #include <linux/kref.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> @@ -642,594 +639,6 @@ __be32 batadv_skb_crc32(struct sk_buff *skb, u8 *payload_ptr) } /** - * batadv_tvlv_handler_release - release tvlv handler from lists and queue for - * free after rcu grace period - * @ref: kref pointer of the tvlv - */ -static void batadv_tvlv_handler_release(struct kref *ref) -{ - struct batadv_tvlv_handler *tvlv_handler; - - tvlv_handler = container_of(ref, struct batadv_tvlv_handler, refcount); - kfree_rcu(tvlv_handler, rcu); -} - -/** - * batadv_tvlv_handler_put - decrement the tvlv container refcounter and - * possibly release it - * @tvlv_handler: the tvlv handler to free - */ -static void batadv_tvlv_handler_put(struct batadv_tvlv_handler *tvlv_handler) -{ - kref_put(&tvlv_handler->refcount, batadv_tvlv_handler_release); -} - -/** - * 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 - * - * Return: 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 (!kref_get_unless_zero(&tvlv_handler_tmp->refcount)) - continue; - - tvlv_handler = tvlv_handler_tmp; - break; - } - rcu_read_unlock(); - - return tvlv_handler; -} - -/** - * batadv_tvlv_container_release - release tvlv from lists and free - * @ref: kref pointer of the tvlv - */ -static void batadv_tvlv_container_release(struct kref *ref) -{ - struct batadv_tvlv_container *tvlv; - - tvlv = container_of(ref, struct batadv_tvlv_container, refcount); - kfree(tvlv); -} - -/** - * batadv_tvlv_container_put - decrement the tvlv container refcounter and - * possibly release it - * @tvlv: the tvlv container to free - */ -static void batadv_tvlv_container_put(struct batadv_tvlv_container *tvlv) -{ - kref_put(&tvlv->refcount, batadv_tvlv_container_release); -} - -/** - * 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). - * - * Return: 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; - - lockdep_assert_held(&bat_priv->tvlv.container_list_lock); - - 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; - - kref_get(&tvlv_tmp->refcount); - 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). - * - * Return: 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; - - lockdep_assert_held(&bat_priv->tvlv.container_list_lock); - - 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_put(tvlv); - batadv_tvlv_container_put(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); - kref_init(&tvlv_new->refcount); - - 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 - * - * Return: 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. - * - * Return: 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 - * - * Return: 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 - * - * Return: 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_put(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_put(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; - kref_init(&tvlv_handler->refcount); - 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_put(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_put(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_put(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 diff --git a/net/batman-adv/main.h b/net/batman-adv/main.h index 38f9e5523190..3af6582aab8b 100644 --- a/net/batman-adv/main.h +++ b/net/batman-adv/main.h @@ -190,7 +190,6 @@ enum batadv_uev_type { #include "types.h" -struct batadv_ogm_packet; struct seq_file; struct sk_buff; @@ -372,39 +371,6 @@ static inline u64 batadv_sum_counter(struct batadv_priv *bat_priv, size_t idx) */ #define BATADV_SKB_CB(__skb) ((struct batadv_skb_cb *)&((__skb)->cb[0])) -void batadv_tvlv_container_register(struct batadv_priv *bat_priv, - u8 type, u8 version, - void *tvlv_value, u16 tvlv_value_len); -u16 batadv_tvlv_container_ogm_append(struct batadv_priv *bat_priv, - unsigned char **packet_buff, - int *packet_buff_len, int packet_min_len); -void batadv_tvlv_ogm_receive(struct batadv_priv *bat_priv, - struct batadv_ogm_packet *batadv_ogm_packet, - struct batadv_orig_node *orig_node); -void batadv_tvlv_container_unregister(struct batadv_priv *bat_priv, - u8 type, u8 version); - -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); -void batadv_tvlv_handler_unregister(struct batadv_priv *bat_priv, - u8 type, u8 version); -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_buff, u16 tvlv_buff_len); -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); unsigned short batadv_get_vid(struct sk_buff *skb, size_t header_len); bool batadv_vlan_ap_isola_get(struct batadv_priv *bat_priv, unsigned short vid); diff --git a/net/batman-adv/multicast.c b/net/batman-adv/multicast.c index d3222db60fd0..0e7d78f4f1b8 100644 --- a/net/batman-adv/multicast.c +++ b/net/batman-adv/multicast.c @@ -57,6 +57,7 @@ #include "hash.h" #include "packet.h" #include "translation-table.h" +#include "tvlv.h" /** * batadv_mcast_get_bridge - get the bridge on top of the softif if it exists diff --git a/net/batman-adv/network-coding.c b/net/batman-adv/network-coding.c index 678f06865312..d0383dea6440 100644 --- a/net/batman-adv/network-coding.c +++ b/net/batman-adv/network-coding.c @@ -55,6 +55,7 @@ #include "packet.h" #include "routing.h" #include "send.h" +#include "tvlv.h" static struct lock_class_key batadv_nc_coding_hash_lock_class_key; static struct lock_class_key batadv_nc_decoding_hash_lock_class_key; diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c index 24fc75335b31..8cb459a57219 100644 --- a/net/batman-adv/routing.c +++ b/net/batman-adv/routing.c @@ -46,6 +46,7 @@ #include "send.h" #include "soft-interface.h" #include "translation-table.h" +#include "tvlv.h" static int batadv_route_unicast_packet(struct sk_buff *skb, struct batadv_hard_iface *recv_if); diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c index 87bb2030186d..6c8d624e4581 100644 --- a/net/batman-adv/translation-table.c +++ b/net/batman-adv/translation-table.c @@ -51,6 +51,7 @@ #include "originator.h" #include "packet.h" #include "soft-interface.h" +#include "tvlv.h" /* hash class keys */ static struct lock_class_key batadv_tt_local_hash_lock_class_key; diff --git a/net/batman-adv/tvlv.c b/net/batman-adv/tvlv.c new file mode 100644 index 000000000000..2fd542e0d6a8 --- /dev/null +++ b/net/batman-adv/tvlv.c @@ -0,0 +1,630 @@ +/* Copyright (C) 2007-2016 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/byteorder/generic.h> +#include <linux/etherdevice.h> +#include <linux/fs.h> +#include <linux/if_ether.h> +#include <linux/kernel.h> +#include <linux/kref.h> +#include <linux/list.h> +#include <linux/lockdep.h> +#include <linux/netdevice.h> +#include <linux/pkt_sched.h> +#include <linux/rculist.h> +#include <linux/rcupdate.h> +#include <linux/skbuff.h> +#include <linux/slab.h> +#include <linux/spinlock.h> +#include <linux/stddef.h> +#include <linux/string.h> +#include <linux/types.h> + +#include "originator.h" +#include "packet.h" +#include "send.h" +#include "tvlv.h" + +/** + * batadv_tvlv_handler_release - release tvlv handler from lists and queue for + * free after rcu grace period + * @ref: kref pointer of the tvlv + */ +static void batadv_tvlv_handler_release(struct kref *ref) +{ + struct batadv_tvlv_handler *tvlv_handler; + + tvlv_handler = container_of(ref, struct batadv_tvlv_handler, refcount); + kfree_rcu(tvlv_handler, rcu); +} + +/** + * batadv_tvlv_handler_put - decrement the tvlv container refcounter and + * possibly release it + * @tvlv_handler: the tvlv handler to free + */ +static void batadv_tvlv_handler_put(struct batadv_tvlv_handler *tvlv_handler) +{ + kref_put(&tvlv_handler->refcount, batadv_tvlv_handler_release); +} + +/** + * 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 + * + * Return: 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 (!kref_get_unless_zero(&tvlv_handler_tmp->refcount)) + continue; + + tvlv_handler = tvlv_handler_tmp; + break; + } + rcu_read_unlock(); + + return tvlv_handler; +} + +/** + * batadv_tvlv_container_release - release tvlv from lists and free + * @ref: kref pointer of the tvlv + */ +static void batadv_tvlv_container_release(struct kref *ref) +{ + struct batadv_tvlv_container *tvlv; + + tvlv = container_of(ref, struct batadv_tvlv_container, refcount); + kfree(tvlv); +} + +/** + * batadv_tvlv_container_put - decrement the tvlv container refcounter and + * possibly release it + * @tvlv: the tvlv container to free + */ +static void batadv_tvlv_container_put(struct batadv_tvlv_container *tvlv) +{ + kref_put(&tvlv->refcount, batadv_tvlv_container_release); +} + +/** + * 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). + * + * Return: 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; + + lockdep_assert_held(&bat_priv->tvlv.container_list_lock); + + 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; + + kref_get(&tvlv_tmp->refcount); + 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). + * + * Return: 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; + + lockdep_assert_held(&bat_priv->tvlv.container_list_lock); + + 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_put(tvlv); + batadv_tvlv_container_put(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); + kref_init(&tvlv_new->refcount); + + 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 + * + * Return: 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. + * + * Return: 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 + * + * Return: 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 + * + * Return: 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_put(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_put(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; + kref_init(&tvlv_handler->refcount); + 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_put(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_put(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_put(orig_node); +} diff --git a/net/batman-adv/tvlv.h b/net/batman-adv/tvlv.h new file mode 100644 index 000000000000..e4369b547b43 --- /dev/null +++ b/net/batman-adv/tvlv.h @@ -0,0 +1,61 @@ +/* Copyright (C) 2007-2016 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/>. + */ + +#ifndef _NET_BATMAN_ADV_TVLV_H_ +#define _NET_BATMAN_ADV_TVLV_H_ + +#include "main.h" + +#include <linux/types.h> + +struct batadv_ogm_packet; + +void batadv_tvlv_container_register(struct batadv_priv *bat_priv, + u8 type, u8 version, + void *tvlv_value, u16 tvlv_value_len); +u16 batadv_tvlv_container_ogm_append(struct batadv_priv *bat_priv, + unsigned char **packet_buff, + int *packet_buff_len, int packet_min_len); +void batadv_tvlv_ogm_receive(struct batadv_priv *bat_priv, + struct batadv_ogm_packet *batadv_ogm_packet, + struct batadv_orig_node *orig_node); +void batadv_tvlv_container_unregister(struct batadv_priv *bat_priv, + u8 type, u8 version); + +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); +void batadv_tvlv_handler_unregister(struct batadv_priv *bat_priv, + u8 type, u8 version); +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_buff, u16 tvlv_buff_len); +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); + +#endif /* _NET_BATMAN_ADV_TVLV_H_ */ |