forked from Minki/linux
7a79d717e0
Signed-off-by: Sven Eckelmann <sven@narfation.org> Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
644 lines
19 KiB
C
644 lines
19 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (C) 2007-2019 B.A.T.M.A.N. contributors:
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*
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* Marek Lindner, Simon Wunderlich
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "main.h"
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#include <linux/byteorder/generic.h>
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#include <linux/etherdevice.h>
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#include <linux/gfp.h>
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#include <linux/if_ether.h>
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#include <linux/kernel.h>
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#include <linux/kref.h>
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#include <linux/list.h>
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#include <linux/lockdep.h>
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#include <linux/netdevice.h>
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#include <linux/pkt_sched.h>
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#include <linux/rculist.h>
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#include <linux/rcupdate.h>
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#include <linux/skbuff.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/stddef.h>
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#include <linux/string.h>
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#include <linux/types.h>
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#include <uapi/linux/batadv_packet.h>
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#include "originator.h"
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#include "send.h"
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#include "tvlv.h"
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/**
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* batadv_tvlv_handler_release() - release tvlv handler from lists and queue for
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* free after rcu grace period
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* @ref: kref pointer of the tvlv
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*/
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static void batadv_tvlv_handler_release(struct kref *ref)
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{
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struct batadv_tvlv_handler *tvlv_handler;
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tvlv_handler = container_of(ref, struct batadv_tvlv_handler, refcount);
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kfree_rcu(tvlv_handler, rcu);
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}
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/**
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* batadv_tvlv_handler_put() - decrement the tvlv container refcounter and
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* possibly release it
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* @tvlv_handler: the tvlv handler to free
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*/
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static void batadv_tvlv_handler_put(struct batadv_tvlv_handler *tvlv_handler)
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{
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kref_put(&tvlv_handler->refcount, batadv_tvlv_handler_release);
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}
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/**
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* batadv_tvlv_handler_get() - retrieve tvlv handler from the tvlv handler list
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* based on the provided type and version (both need to match)
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* @bat_priv: the bat priv with all the soft interface information
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* @type: tvlv handler type to look for
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* @version: tvlv handler version to look for
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*
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* Return: tvlv handler if found or NULL otherwise.
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*/
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static struct batadv_tvlv_handler *
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batadv_tvlv_handler_get(struct batadv_priv *bat_priv, u8 type, u8 version)
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{
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struct batadv_tvlv_handler *tvlv_handler_tmp, *tvlv_handler = NULL;
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rcu_read_lock();
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hlist_for_each_entry_rcu(tvlv_handler_tmp,
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&bat_priv->tvlv.handler_list, list) {
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if (tvlv_handler_tmp->type != type)
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continue;
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if (tvlv_handler_tmp->version != version)
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continue;
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if (!kref_get_unless_zero(&tvlv_handler_tmp->refcount))
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continue;
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tvlv_handler = tvlv_handler_tmp;
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break;
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}
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rcu_read_unlock();
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return tvlv_handler;
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}
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/**
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* batadv_tvlv_container_release() - release tvlv from lists and free
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* @ref: kref pointer of the tvlv
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*/
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static void batadv_tvlv_container_release(struct kref *ref)
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{
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struct batadv_tvlv_container *tvlv;
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tvlv = container_of(ref, struct batadv_tvlv_container, refcount);
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kfree(tvlv);
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}
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/**
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* batadv_tvlv_container_put() - decrement the tvlv container refcounter and
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* possibly release it
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* @tvlv: the tvlv container to free
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*/
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static void batadv_tvlv_container_put(struct batadv_tvlv_container *tvlv)
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{
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kref_put(&tvlv->refcount, batadv_tvlv_container_release);
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}
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/**
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* batadv_tvlv_container_get() - retrieve tvlv container from the tvlv container
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* list based on the provided type and version (both need to match)
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* @bat_priv: the bat priv with all the soft interface information
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* @type: tvlv container type to look for
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* @version: tvlv container version to look for
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*
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* Has to be called with the appropriate locks being acquired
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* (tvlv.container_list_lock).
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*
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* Return: tvlv container if found or NULL otherwise.
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*/
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static struct batadv_tvlv_container *
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batadv_tvlv_container_get(struct batadv_priv *bat_priv, u8 type, u8 version)
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{
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struct batadv_tvlv_container *tvlv_tmp, *tvlv = NULL;
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lockdep_assert_held(&bat_priv->tvlv.container_list_lock);
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hlist_for_each_entry(tvlv_tmp, &bat_priv->tvlv.container_list, list) {
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if (tvlv_tmp->tvlv_hdr.type != type)
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continue;
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if (tvlv_tmp->tvlv_hdr.version != version)
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continue;
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kref_get(&tvlv_tmp->refcount);
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tvlv = tvlv_tmp;
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break;
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}
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return tvlv;
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}
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/**
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* batadv_tvlv_container_list_size() - calculate the size of the tvlv container
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* list entries
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* @bat_priv: the bat priv with all the soft interface information
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*
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* Has to be called with the appropriate locks being acquired
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* (tvlv.container_list_lock).
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*
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* Return: size of all currently registered tvlv containers in bytes.
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*/
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static u16 batadv_tvlv_container_list_size(struct batadv_priv *bat_priv)
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{
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struct batadv_tvlv_container *tvlv;
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u16 tvlv_len = 0;
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lockdep_assert_held(&bat_priv->tvlv.container_list_lock);
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hlist_for_each_entry(tvlv, &bat_priv->tvlv.container_list, list) {
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tvlv_len += sizeof(struct batadv_tvlv_hdr);
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tvlv_len += ntohs(tvlv->tvlv_hdr.len);
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}
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return tvlv_len;
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}
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/**
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* batadv_tvlv_container_remove() - remove tvlv container from the tvlv
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* container list
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* @bat_priv: the bat priv with all the soft interface information
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* @tvlv: the to be removed tvlv container
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*
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* Has to be called with the appropriate locks being acquired
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* (tvlv.container_list_lock).
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*/
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static void batadv_tvlv_container_remove(struct batadv_priv *bat_priv,
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struct batadv_tvlv_container *tvlv)
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{
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lockdep_assert_held(&bat_priv->tvlv.container_list_lock);
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if (!tvlv)
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return;
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hlist_del(&tvlv->list);
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/* first call to decrement the counter, second call to free */
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batadv_tvlv_container_put(tvlv);
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batadv_tvlv_container_put(tvlv);
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}
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/**
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* batadv_tvlv_container_unregister() - unregister tvlv container based on the
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* provided type and version (both need to match)
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* @bat_priv: the bat priv with all the soft interface information
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* @type: tvlv container type to unregister
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* @version: tvlv container type to unregister
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*/
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void batadv_tvlv_container_unregister(struct batadv_priv *bat_priv,
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u8 type, u8 version)
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{
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struct batadv_tvlv_container *tvlv;
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spin_lock_bh(&bat_priv->tvlv.container_list_lock);
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tvlv = batadv_tvlv_container_get(bat_priv, type, version);
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batadv_tvlv_container_remove(bat_priv, tvlv);
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spin_unlock_bh(&bat_priv->tvlv.container_list_lock);
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}
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/**
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* batadv_tvlv_container_register() - register tvlv type, version and content
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* to be propagated with each (primary interface) OGM
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* @bat_priv: the bat priv with all the soft interface information
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* @type: tvlv container type
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* @version: tvlv container version
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* @tvlv_value: tvlv container content
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* @tvlv_value_len: tvlv container content length
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*
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* If a container of the same type and version was already registered the new
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* content is going to replace the old one.
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*/
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void batadv_tvlv_container_register(struct batadv_priv *bat_priv,
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u8 type, u8 version,
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void *tvlv_value, u16 tvlv_value_len)
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{
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struct batadv_tvlv_container *tvlv_old, *tvlv_new;
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if (!tvlv_value)
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tvlv_value_len = 0;
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tvlv_new = kzalloc(sizeof(*tvlv_new) + tvlv_value_len, GFP_ATOMIC);
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if (!tvlv_new)
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return;
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tvlv_new->tvlv_hdr.version = version;
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tvlv_new->tvlv_hdr.type = type;
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tvlv_new->tvlv_hdr.len = htons(tvlv_value_len);
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memcpy(tvlv_new + 1, tvlv_value, ntohs(tvlv_new->tvlv_hdr.len));
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INIT_HLIST_NODE(&tvlv_new->list);
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kref_init(&tvlv_new->refcount);
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spin_lock_bh(&bat_priv->tvlv.container_list_lock);
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tvlv_old = batadv_tvlv_container_get(bat_priv, type, version);
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batadv_tvlv_container_remove(bat_priv, tvlv_old);
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kref_get(&tvlv_new->refcount);
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hlist_add_head(&tvlv_new->list, &bat_priv->tvlv.container_list);
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spin_unlock_bh(&bat_priv->tvlv.container_list_lock);
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/* don't return reference to new tvlv_container */
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batadv_tvlv_container_put(tvlv_new);
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}
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/**
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* batadv_tvlv_realloc_packet_buff() - reallocate packet buffer to accommodate
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* requested packet size
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* @packet_buff: packet buffer
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* @packet_buff_len: packet buffer size
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* @min_packet_len: requested packet minimum size
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* @additional_packet_len: requested additional packet size on top of minimum
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* size
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*
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* Return: true of the packet buffer could be changed to the requested size,
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* false otherwise.
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*/
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static bool batadv_tvlv_realloc_packet_buff(unsigned char **packet_buff,
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int *packet_buff_len,
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int min_packet_len,
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int additional_packet_len)
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{
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unsigned char *new_buff;
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new_buff = kmalloc(min_packet_len + additional_packet_len, GFP_ATOMIC);
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/* keep old buffer if kmalloc should fail */
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if (!new_buff)
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return false;
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memcpy(new_buff, *packet_buff, min_packet_len);
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kfree(*packet_buff);
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*packet_buff = new_buff;
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*packet_buff_len = min_packet_len + additional_packet_len;
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return true;
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}
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/**
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* batadv_tvlv_container_ogm_append() - append tvlv container content to given
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* OGM packet buffer
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* @bat_priv: the bat priv with all the soft interface information
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* @packet_buff: ogm packet buffer
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* @packet_buff_len: ogm packet buffer size including ogm header and tvlv
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* content
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* @packet_min_len: ogm header size to be preserved for the OGM itself
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*
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* The ogm packet might be enlarged or shrunk depending on the current size
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* and the size of the to-be-appended tvlv containers.
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*
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* Return: size of all appended tvlv containers in bytes.
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*/
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u16 batadv_tvlv_container_ogm_append(struct batadv_priv *bat_priv,
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unsigned char **packet_buff,
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int *packet_buff_len, int packet_min_len)
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{
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struct batadv_tvlv_container *tvlv;
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struct batadv_tvlv_hdr *tvlv_hdr;
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u16 tvlv_value_len;
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void *tvlv_value;
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bool ret;
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spin_lock_bh(&bat_priv->tvlv.container_list_lock);
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tvlv_value_len = batadv_tvlv_container_list_size(bat_priv);
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ret = batadv_tvlv_realloc_packet_buff(packet_buff, packet_buff_len,
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packet_min_len, tvlv_value_len);
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if (!ret)
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goto end;
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if (!tvlv_value_len)
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goto end;
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tvlv_value = (*packet_buff) + packet_min_len;
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hlist_for_each_entry(tvlv, &bat_priv->tvlv.container_list, list) {
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tvlv_hdr = tvlv_value;
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tvlv_hdr->type = tvlv->tvlv_hdr.type;
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tvlv_hdr->version = tvlv->tvlv_hdr.version;
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tvlv_hdr->len = tvlv->tvlv_hdr.len;
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tvlv_value = tvlv_hdr + 1;
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memcpy(tvlv_value, tvlv + 1, ntohs(tvlv->tvlv_hdr.len));
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tvlv_value = (u8 *)tvlv_value + ntohs(tvlv->tvlv_hdr.len);
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}
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end:
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spin_unlock_bh(&bat_priv->tvlv.container_list_lock);
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return tvlv_value_len;
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}
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/**
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* batadv_tvlv_call_handler() - parse the given tvlv buffer to call the
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* appropriate handlers
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* @bat_priv: the bat priv with all the soft interface information
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* @tvlv_handler: tvlv callback function handling the tvlv content
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* @ogm_source: flag indicating whether the tvlv is an ogm or a unicast packet
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* @orig_node: orig node emitting the ogm packet
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* @src: source mac address of the unicast packet
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* @dst: destination mac address of the unicast packet
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* @tvlv_value: tvlv content
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* @tvlv_value_len: tvlv content length
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*
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* Return: success if handler was not found or the return value of the handler
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* callback.
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*/
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static int batadv_tvlv_call_handler(struct batadv_priv *bat_priv,
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struct batadv_tvlv_handler *tvlv_handler,
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bool ogm_source,
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struct batadv_orig_node *orig_node,
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u8 *src, u8 *dst,
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void *tvlv_value, u16 tvlv_value_len)
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{
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if (!tvlv_handler)
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return NET_RX_SUCCESS;
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if (ogm_source) {
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if (!tvlv_handler->ogm_handler)
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return NET_RX_SUCCESS;
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if (!orig_node)
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return NET_RX_SUCCESS;
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tvlv_handler->ogm_handler(bat_priv, orig_node,
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BATADV_NO_FLAGS,
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tvlv_value, tvlv_value_len);
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tvlv_handler->flags |= BATADV_TVLV_HANDLER_OGM_CALLED;
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} else {
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if (!src)
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return NET_RX_SUCCESS;
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if (!dst)
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return NET_RX_SUCCESS;
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if (!tvlv_handler->unicast_handler)
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return NET_RX_SUCCESS;
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return tvlv_handler->unicast_handler(bat_priv, src,
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dst, tvlv_value,
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tvlv_value_len);
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}
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return NET_RX_SUCCESS;
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}
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/**
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* batadv_tvlv_containers_process() - parse the given tvlv buffer to call the
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* appropriate handlers
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* @bat_priv: the bat priv with all the soft interface information
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* @ogm_source: flag indicating whether the tvlv is an ogm or a unicast packet
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* @orig_node: orig node emitting the ogm packet
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* @src: source mac address of the unicast packet
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* @dst: destination mac address of the unicast packet
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* @tvlv_value: tvlv content
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* @tvlv_value_len: tvlv content length
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*
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* Return: success when processing an OGM or the return value of all called
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* handler callbacks.
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*/
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int batadv_tvlv_containers_process(struct batadv_priv *bat_priv,
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bool ogm_source,
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struct batadv_orig_node *orig_node,
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u8 *src, u8 *dst,
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void *tvlv_value, u16 tvlv_value_len)
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{
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struct batadv_tvlv_handler *tvlv_handler;
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struct batadv_tvlv_hdr *tvlv_hdr;
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u16 tvlv_value_cont_len;
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u8 cifnotfound = BATADV_TVLV_HANDLER_OGM_CIFNOTFND;
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int ret = NET_RX_SUCCESS;
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while (tvlv_value_len >= sizeof(*tvlv_hdr)) {
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tvlv_hdr = tvlv_value;
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tvlv_value_cont_len = ntohs(tvlv_hdr->len);
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tvlv_value = tvlv_hdr + 1;
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tvlv_value_len -= sizeof(*tvlv_hdr);
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if (tvlv_value_cont_len > tvlv_value_len)
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break;
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tvlv_handler = batadv_tvlv_handler_get(bat_priv,
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tvlv_hdr->type,
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tvlv_hdr->version);
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ret |= batadv_tvlv_call_handler(bat_priv, tvlv_handler,
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ogm_source, orig_node,
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src, dst, tvlv_value,
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tvlv_value_cont_len);
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if (tvlv_handler)
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batadv_tvlv_handler_put(tvlv_handler);
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tvlv_value = (u8 *)tvlv_value + tvlv_value_cont_len;
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tvlv_value_len -= tvlv_value_cont_len;
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}
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if (!ogm_source)
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return ret;
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rcu_read_lock();
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hlist_for_each_entry_rcu(tvlv_handler,
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&bat_priv->tvlv.handler_list, list) {
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if ((tvlv_handler->flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND) &&
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!(tvlv_handler->flags & BATADV_TVLV_HANDLER_OGM_CALLED))
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tvlv_handler->ogm_handler(bat_priv, orig_node,
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cifnotfound, NULL, 0);
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tvlv_handler->flags &= ~BATADV_TVLV_HANDLER_OGM_CALLED;
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}
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rcu_read_unlock();
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return NET_RX_SUCCESS;
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}
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/**
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* batadv_tvlv_ogm_receive() - process an incoming ogm and call the appropriate
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* handlers
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* @bat_priv: the bat priv with all the soft interface information
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* @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;
|
|
|
|
spin_lock_bh(&bat_priv->tvlv.handler_list_lock);
|
|
|
|
tvlv_handler = batadv_tvlv_handler_get(bat_priv, type, version);
|
|
if (tvlv_handler) {
|
|
spin_unlock_bh(&bat_priv->tvlv.handler_list_lock);
|
|
batadv_tvlv_handler_put(tvlv_handler);
|
|
return;
|
|
}
|
|
|
|
tvlv_handler = kzalloc(sizeof(*tvlv_handler), GFP_ATOMIC);
|
|
if (!tvlv_handler) {
|
|
spin_unlock_bh(&bat_priv->tvlv.handler_list_lock);
|
|
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);
|
|
|
|
kref_get(&tvlv_handler->refcount);
|
|
hlist_add_head_rcu(&tvlv_handler->list, &bat_priv->tvlv.handler_list);
|
|
spin_unlock_bh(&bat_priv->tvlv.handler_list_lock);
|
|
|
|
/* don't return reference to new tvlv_handler */
|
|
batadv_tvlv_handler_put(tvlv_handler);
|
|
}
|
|
|
|
/**
|
|
* 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);
|
|
|
|
batadv_send_skb_to_orig(skb, orig_node, NULL);
|
|
out:
|
|
batadv_orig_node_put(orig_node);
|
|
}
|