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![Sven Eckelmann](/assets/img/avatar_default.png)
The debug messages of _batadv_update_route were printed before the actual route change is done. At this point it is not really known which curr_router will be replaced. Thus the messages could print the wrong operation. Printing the debug messages after the operation was done avoids this problem. Signed-off-by: Sven Eckelmann <sven@narfation.org> Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch> Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
1173 lines
34 KiB
C
1173 lines
34 KiB
C
/* Copyright (C) 2007-2016 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 "routing.h"
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#include "main.h"
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#include <linux/atomic.h>
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#include <linux/byteorder/generic.h>
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#include <linux/compiler.h>
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#include <linux/errno.h>
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#include <linux/etherdevice.h>
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#include <linux/if_ether.h>
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#include <linux/jiffies.h>
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#include <linux/kref.h>
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#include <linux/netdevice.h>
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#include <linux/printk.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/spinlock.h>
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#include <linux/stddef.h>
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#include "bitarray.h"
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#include "bridge_loop_avoidance.h"
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#include "distributed-arp-table.h"
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#include "fragmentation.h"
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#include "hard-interface.h"
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#include "icmp_socket.h"
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#include "log.h"
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#include "network-coding.h"
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#include "originator.h"
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#include "packet.h"
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#include "send.h"
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#include "soft-interface.h"
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#include "tp_meter.h"
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#include "translation-table.h"
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#include "tvlv.h"
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static int batadv_route_unicast_packet(struct sk_buff *skb,
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struct batadv_hard_iface *recv_if);
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/**
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* _batadv_update_route - set the router for this originator
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* @bat_priv: the bat priv with all the soft interface information
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* @orig_node: orig node which is to be configured
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* @recv_if: the receive interface for which this route is set
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* @neigh_node: neighbor which should be the next router
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*
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* This function does not perform any error checks
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*/
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static void _batadv_update_route(struct batadv_priv *bat_priv,
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struct batadv_orig_node *orig_node,
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struct batadv_hard_iface *recv_if,
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struct batadv_neigh_node *neigh_node)
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{
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struct batadv_orig_ifinfo *orig_ifinfo;
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struct batadv_neigh_node *curr_router;
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orig_ifinfo = batadv_orig_ifinfo_get(orig_node, recv_if);
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if (!orig_ifinfo)
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return;
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spin_lock_bh(&orig_node->neigh_list_lock);
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/* curr_router used earlier may not be the current orig_ifinfo->router
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* anymore because it was dereferenced outside of the neigh_list_lock
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* protected region. After the new best neighbor has replace the current
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* best neighbor the reference counter needs to decrease. Consequently,
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* the code needs to ensure the curr_router variable contains a pointer
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* to the replaced best neighbor.
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*/
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curr_router = rcu_dereference_protected(orig_ifinfo->router, true);
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/* increase refcount of new best neighbor */
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if (neigh_node)
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kref_get(&neigh_node->refcount);
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rcu_assign_pointer(orig_ifinfo->router, neigh_node);
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spin_unlock_bh(&orig_node->neigh_list_lock);
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batadv_orig_ifinfo_put(orig_ifinfo);
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/* route deleted */
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if ((curr_router) && (!neigh_node)) {
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batadv_dbg(BATADV_DBG_ROUTES, bat_priv,
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"Deleting route towards: %pM\n", orig_node->orig);
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batadv_tt_global_del_orig(bat_priv, orig_node, -1,
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"Deleted route towards originator");
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/* route added */
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} else if ((!curr_router) && (neigh_node)) {
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batadv_dbg(BATADV_DBG_ROUTES, bat_priv,
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"Adding route towards: %pM (via %pM)\n",
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orig_node->orig, neigh_node->addr);
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/* route changed */
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} else if (neigh_node && curr_router) {
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batadv_dbg(BATADV_DBG_ROUTES, bat_priv,
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"Changing route towards: %pM (now via %pM - was via %pM)\n",
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orig_node->orig, neigh_node->addr,
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curr_router->addr);
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}
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/* decrease refcount of previous best neighbor */
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if (curr_router)
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batadv_neigh_node_put(curr_router);
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}
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/**
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* batadv_update_route - set the router for this originator
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* @bat_priv: the bat priv with all the soft interface information
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* @orig_node: orig node which is to be configured
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* @recv_if: the receive interface for which this route is set
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* @neigh_node: neighbor which should be the next router
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*/
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void batadv_update_route(struct batadv_priv *bat_priv,
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struct batadv_orig_node *orig_node,
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struct batadv_hard_iface *recv_if,
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struct batadv_neigh_node *neigh_node)
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{
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struct batadv_neigh_node *router = NULL;
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if (!orig_node)
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goto out;
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router = batadv_orig_router_get(orig_node, recv_if);
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if (router != neigh_node)
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_batadv_update_route(bat_priv, orig_node, recv_if, neigh_node);
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out:
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if (router)
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batadv_neigh_node_put(router);
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}
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/**
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* batadv_window_protected - checks whether the host restarted and is in the
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* protection time.
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* @bat_priv: the bat priv with all the soft interface information
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* @seq_num_diff: difference between the current/received sequence number and
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* the last sequence number
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* @seq_old_max_diff: maximum age of sequence number not considered as restart
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* @last_reset: jiffies timestamp of the last reset, will be updated when reset
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* is detected
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* @protection_started: is set to true if the protection window was started,
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* doesn't change otherwise.
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*
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* Return:
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* false if the packet is to be accepted.
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* true if the packet is to be ignored.
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*/
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bool batadv_window_protected(struct batadv_priv *bat_priv, s32 seq_num_diff,
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s32 seq_old_max_diff, unsigned long *last_reset,
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bool *protection_started)
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{
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if (seq_num_diff <= -seq_old_max_diff ||
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seq_num_diff >= BATADV_EXPECTED_SEQNO_RANGE) {
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if (!batadv_has_timed_out(*last_reset,
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BATADV_RESET_PROTECTION_MS))
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return true;
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*last_reset = jiffies;
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if (protection_started)
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*protection_started = true;
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batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
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"old packet received, start protection\n");
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}
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return false;
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}
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bool batadv_check_management_packet(struct sk_buff *skb,
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struct batadv_hard_iface *hard_iface,
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int header_len)
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{
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struct ethhdr *ethhdr;
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/* drop packet if it has not necessary minimum size */
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if (unlikely(!pskb_may_pull(skb, header_len)))
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return false;
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ethhdr = eth_hdr(skb);
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/* packet with broadcast indication but unicast recipient */
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if (!is_broadcast_ether_addr(ethhdr->h_dest))
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return false;
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/* packet with broadcast sender address */
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if (is_broadcast_ether_addr(ethhdr->h_source))
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return false;
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/* create a copy of the skb, if needed, to modify it. */
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if (skb_cow(skb, 0) < 0)
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return false;
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/* keep skb linear */
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if (skb_linearize(skb) < 0)
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return false;
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return true;
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}
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/**
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* batadv_recv_my_icmp_packet - receive an icmp packet locally
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* @bat_priv: the bat priv with all the soft interface information
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* @skb: icmp packet to process
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*
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* Return: NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP
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* otherwise.
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*/
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static int batadv_recv_my_icmp_packet(struct batadv_priv *bat_priv,
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struct sk_buff *skb)
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{
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struct batadv_hard_iface *primary_if = NULL;
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struct batadv_orig_node *orig_node = NULL;
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struct batadv_icmp_header *icmph;
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int res, ret = NET_RX_DROP;
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icmph = (struct batadv_icmp_header *)skb->data;
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switch (icmph->msg_type) {
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case BATADV_ECHO_REPLY:
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case BATADV_DESTINATION_UNREACHABLE:
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case BATADV_TTL_EXCEEDED:
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/* receive the packet */
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if (skb_linearize(skb) < 0)
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break;
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batadv_socket_receive_packet(icmph, skb->len);
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break;
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case BATADV_ECHO_REQUEST:
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/* answer echo request (ping) */
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primary_if = batadv_primary_if_get_selected(bat_priv);
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if (!primary_if)
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goto out;
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/* get routing information */
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orig_node = batadv_orig_hash_find(bat_priv, icmph->orig);
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if (!orig_node)
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goto out;
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/* create a copy of the skb, if needed, to modify it. */
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if (skb_cow(skb, ETH_HLEN) < 0)
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goto out;
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icmph = (struct batadv_icmp_header *)skb->data;
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ether_addr_copy(icmph->dst, icmph->orig);
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ether_addr_copy(icmph->orig, primary_if->net_dev->dev_addr);
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icmph->msg_type = BATADV_ECHO_REPLY;
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icmph->ttl = BATADV_TTL;
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res = batadv_send_skb_to_orig(skb, orig_node, NULL);
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if (res == -1)
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goto out;
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ret = NET_RX_SUCCESS;
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break;
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case BATADV_TP:
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if (!pskb_may_pull(skb, sizeof(struct batadv_icmp_tp_packet)))
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goto out;
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batadv_tp_meter_recv(bat_priv, skb);
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ret = NET_RX_SUCCESS;
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goto out;
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default:
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/* drop unknown type */
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goto out;
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}
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out:
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if (primary_if)
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batadv_hardif_put(primary_if);
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if (orig_node)
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batadv_orig_node_put(orig_node);
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return ret;
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}
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static int batadv_recv_icmp_ttl_exceeded(struct batadv_priv *bat_priv,
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struct sk_buff *skb)
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{
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struct batadv_hard_iface *primary_if = NULL;
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struct batadv_orig_node *orig_node = NULL;
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struct batadv_icmp_packet *icmp_packet;
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int res, ret = NET_RX_DROP;
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icmp_packet = (struct batadv_icmp_packet *)skb->data;
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/* send TTL exceeded if packet is an echo request (traceroute) */
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if (icmp_packet->msg_type != BATADV_ECHO_REQUEST) {
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pr_debug("Warning - can't forward icmp packet from %pM to %pM: ttl exceeded\n",
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icmp_packet->orig, icmp_packet->dst);
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goto out;
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}
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primary_if = batadv_primary_if_get_selected(bat_priv);
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if (!primary_if)
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goto out;
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/* get routing information */
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orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->orig);
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if (!orig_node)
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goto out;
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/* create a copy of the skb, if needed, to modify it. */
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if (skb_cow(skb, ETH_HLEN) < 0)
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goto out;
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icmp_packet = (struct batadv_icmp_packet *)skb->data;
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ether_addr_copy(icmp_packet->dst, icmp_packet->orig);
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ether_addr_copy(icmp_packet->orig, primary_if->net_dev->dev_addr);
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icmp_packet->msg_type = BATADV_TTL_EXCEEDED;
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icmp_packet->ttl = BATADV_TTL;
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res = batadv_send_skb_to_orig(skb, orig_node, NULL);
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if (res != -1)
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ret = NET_RX_SUCCESS;
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out:
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if (primary_if)
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batadv_hardif_put(primary_if);
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if (orig_node)
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batadv_orig_node_put(orig_node);
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return ret;
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}
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int batadv_recv_icmp_packet(struct sk_buff *skb,
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struct batadv_hard_iface *recv_if)
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{
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struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
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struct batadv_icmp_header *icmph;
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struct batadv_icmp_packet_rr *icmp_packet_rr;
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struct ethhdr *ethhdr;
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struct batadv_orig_node *orig_node = NULL;
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int hdr_size = sizeof(struct batadv_icmp_header);
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int res, ret = NET_RX_DROP;
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/* drop packet if it has not necessary minimum size */
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if (unlikely(!pskb_may_pull(skb, hdr_size)))
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goto out;
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ethhdr = eth_hdr(skb);
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/* packet with unicast indication but broadcast recipient */
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if (is_broadcast_ether_addr(ethhdr->h_dest))
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goto out;
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/* packet with broadcast sender address */
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if (is_broadcast_ether_addr(ethhdr->h_source))
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goto out;
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/* not for me */
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if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest))
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goto out;
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icmph = (struct batadv_icmp_header *)skb->data;
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/* add record route information if not full */
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if ((icmph->msg_type == BATADV_ECHO_REPLY ||
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icmph->msg_type == BATADV_ECHO_REQUEST) &&
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(skb->len >= sizeof(struct batadv_icmp_packet_rr))) {
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if (skb_linearize(skb) < 0)
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goto out;
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/* create a copy of the skb, if needed, to modify it. */
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if (skb_cow(skb, ETH_HLEN) < 0)
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goto out;
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ethhdr = eth_hdr(skb);
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icmph = (struct batadv_icmp_header *)skb->data;
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icmp_packet_rr = (struct batadv_icmp_packet_rr *)icmph;
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if (icmp_packet_rr->rr_cur >= BATADV_RR_LEN)
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goto out;
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ether_addr_copy(icmp_packet_rr->rr[icmp_packet_rr->rr_cur],
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ethhdr->h_dest);
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icmp_packet_rr->rr_cur++;
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}
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/* packet for me */
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if (batadv_is_my_mac(bat_priv, icmph->dst))
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return batadv_recv_my_icmp_packet(bat_priv, skb);
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/* TTL exceeded */
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if (icmph->ttl < 2)
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return batadv_recv_icmp_ttl_exceeded(bat_priv, skb);
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/* get routing information */
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orig_node = batadv_orig_hash_find(bat_priv, icmph->dst);
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if (!orig_node)
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goto out;
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/* create a copy of the skb, if needed, to modify it. */
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if (skb_cow(skb, ETH_HLEN) < 0)
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goto out;
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icmph = (struct batadv_icmp_header *)skb->data;
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/* decrement ttl */
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icmph->ttl--;
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/* route it */
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res = batadv_send_skb_to_orig(skb, orig_node, recv_if);
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if (res != -1)
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ret = NET_RX_SUCCESS;
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out:
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if (orig_node)
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batadv_orig_node_put(orig_node);
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return ret;
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}
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|
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/**
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* batadv_check_unicast_packet - Check for malformed unicast packets
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* @bat_priv: the bat priv with all the soft interface information
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* @skb: packet to check
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* @hdr_size: size of header to pull
|
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*
|
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* Check for short header and bad addresses in given packet.
|
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*
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* Return: negative value when check fails and 0 otherwise. The negative value
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* depends on the reason: -ENODATA for bad header, -EBADR for broadcast
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* destination or source, and -EREMOTE for non-local (other host) destination.
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*/
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static int batadv_check_unicast_packet(struct batadv_priv *bat_priv,
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struct sk_buff *skb, int hdr_size)
|
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{
|
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struct ethhdr *ethhdr;
|
|
|
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/* drop packet if it has not necessary minimum size */
|
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if (unlikely(!pskb_may_pull(skb, hdr_size)))
|
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return -ENODATA;
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|
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ethhdr = eth_hdr(skb);
|
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|
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/* packet with unicast indication but broadcast recipient */
|
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if (is_broadcast_ether_addr(ethhdr->h_dest))
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return -EBADR;
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|
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/* packet with broadcast sender address */
|
|
if (is_broadcast_ether_addr(ethhdr->h_source))
|
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return -EBADR;
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|
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/* not for me */
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if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest))
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return -EREMOTE;
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|
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return 0;
|
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}
|
|
|
|
/**
|
|
* batadv_last_bonding_replace - Replace last_bonding_candidate of orig_node
|
|
* @orig_node: originator node whose bonding candidates should be replaced
|
|
* @new_candidate: new bonding candidate or NULL
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|
*/
|
|
static void
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|
batadv_last_bonding_replace(struct batadv_orig_node *orig_node,
|
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struct batadv_orig_ifinfo *new_candidate)
|
|
{
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struct batadv_orig_ifinfo *old_candidate;
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|
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spin_lock_bh(&orig_node->neigh_list_lock);
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|
old_candidate = orig_node->last_bonding_candidate;
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|
|
|
if (new_candidate)
|
|
kref_get(&new_candidate->refcount);
|
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orig_node->last_bonding_candidate = new_candidate;
|
|
spin_unlock_bh(&orig_node->neigh_list_lock);
|
|
|
|
if (old_candidate)
|
|
batadv_orig_ifinfo_put(old_candidate);
|
|
}
|
|
|
|
/**
|
|
* batadv_find_router - find a suitable router for this originator
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @orig_node: the destination node
|
|
* @recv_if: pointer to interface this packet was received on
|
|
*
|
|
* Return: the router which should be used for this orig_node on
|
|
* this interface, or NULL if not available.
|
|
*/
|
|
struct batadv_neigh_node *
|
|
batadv_find_router(struct batadv_priv *bat_priv,
|
|
struct batadv_orig_node *orig_node,
|
|
struct batadv_hard_iface *recv_if)
|
|
{
|
|
struct batadv_algo_ops *bao = bat_priv->algo_ops;
|
|
struct batadv_neigh_node *first_candidate_router = NULL;
|
|
struct batadv_neigh_node *next_candidate_router = NULL;
|
|
struct batadv_neigh_node *router, *cand_router = NULL;
|
|
struct batadv_neigh_node *last_cand_router = NULL;
|
|
struct batadv_orig_ifinfo *cand, *first_candidate = NULL;
|
|
struct batadv_orig_ifinfo *next_candidate = NULL;
|
|
struct batadv_orig_ifinfo *last_candidate;
|
|
bool last_candidate_found = false;
|
|
|
|
if (!orig_node)
|
|
return NULL;
|
|
|
|
router = batadv_orig_router_get(orig_node, recv_if);
|
|
|
|
if (!router)
|
|
return router;
|
|
|
|
/* only consider bonding for recv_if == BATADV_IF_DEFAULT (first hop)
|
|
* and if activated.
|
|
*/
|
|
if (!(recv_if == BATADV_IF_DEFAULT && atomic_read(&bat_priv->bonding)))
|
|
return router;
|
|
|
|
/* bonding: loop through the list of possible routers found
|
|
* for the various outgoing interfaces and find a candidate after
|
|
* the last chosen bonding candidate (next_candidate). If no such
|
|
* router is found, use the first candidate found (the previously
|
|
* chosen bonding candidate might have been the last one in the list).
|
|
* If this can't be found either, return the previously chosen
|
|
* router - obviously there are no other candidates.
|
|
*/
|
|
rcu_read_lock();
|
|
last_candidate = orig_node->last_bonding_candidate;
|
|
if (last_candidate)
|
|
last_cand_router = rcu_dereference(last_candidate->router);
|
|
|
|
hlist_for_each_entry_rcu(cand, &orig_node->ifinfo_list, list) {
|
|
/* acquire some structures and references ... */
|
|
if (!kref_get_unless_zero(&cand->refcount))
|
|
continue;
|
|
|
|
cand_router = rcu_dereference(cand->router);
|
|
if (!cand_router)
|
|
goto next;
|
|
|
|
if (!kref_get_unless_zero(&cand_router->refcount)) {
|
|
cand_router = NULL;
|
|
goto next;
|
|
}
|
|
|
|
/* alternative candidate should be good enough to be
|
|
* considered
|
|
*/
|
|
if (!bao->neigh.is_similar_or_better(cand_router,
|
|
cand->if_outgoing, router,
|
|
recv_if))
|
|
goto next;
|
|
|
|
/* don't use the same router twice */
|
|
if (last_cand_router == cand_router)
|
|
goto next;
|
|
|
|
/* mark the first possible candidate */
|
|
if (!first_candidate) {
|
|
kref_get(&cand_router->refcount);
|
|
kref_get(&cand->refcount);
|
|
first_candidate = cand;
|
|
first_candidate_router = cand_router;
|
|
}
|
|
|
|
/* check if the loop has already passed the previously selected
|
|
* candidate ... this function should select the next candidate
|
|
* AFTER the previously used bonding candidate.
|
|
*/
|
|
if (!last_candidate || last_candidate_found) {
|
|
next_candidate = cand;
|
|
next_candidate_router = cand_router;
|
|
break;
|
|
}
|
|
|
|
if (last_candidate == cand)
|
|
last_candidate_found = true;
|
|
next:
|
|
/* free references */
|
|
if (cand_router) {
|
|
batadv_neigh_node_put(cand_router);
|
|
cand_router = NULL;
|
|
}
|
|
batadv_orig_ifinfo_put(cand);
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
/* After finding candidates, handle the three cases:
|
|
* 1) there is a next candidate, use that
|
|
* 2) there is no next candidate, use the first of the list
|
|
* 3) there is no candidate at all, return the default router
|
|
*/
|
|
if (next_candidate) {
|
|
batadv_neigh_node_put(router);
|
|
|
|
kref_get(&next_candidate_router->refcount);
|
|
router = next_candidate_router;
|
|
batadv_last_bonding_replace(orig_node, next_candidate);
|
|
} else if (first_candidate) {
|
|
batadv_neigh_node_put(router);
|
|
|
|
kref_get(&first_candidate_router->refcount);
|
|
router = first_candidate_router;
|
|
batadv_last_bonding_replace(orig_node, first_candidate);
|
|
} else {
|
|
batadv_last_bonding_replace(orig_node, NULL);
|
|
}
|
|
|
|
/* cleanup of candidates */
|
|
if (first_candidate) {
|
|
batadv_neigh_node_put(first_candidate_router);
|
|
batadv_orig_ifinfo_put(first_candidate);
|
|
}
|
|
|
|
if (next_candidate) {
|
|
batadv_neigh_node_put(next_candidate_router);
|
|
batadv_orig_ifinfo_put(next_candidate);
|
|
}
|
|
|
|
return router;
|
|
}
|
|
|
|
static int batadv_route_unicast_packet(struct sk_buff *skb,
|
|
struct batadv_hard_iface *recv_if)
|
|
{
|
|
struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
|
|
struct batadv_orig_node *orig_node = NULL;
|
|
struct batadv_unicast_packet *unicast_packet;
|
|
struct ethhdr *ethhdr = eth_hdr(skb);
|
|
int res, hdr_len, ret = NET_RX_DROP;
|
|
unsigned int len;
|
|
|
|
unicast_packet = (struct batadv_unicast_packet *)skb->data;
|
|
|
|
/* TTL exceeded */
|
|
if (unicast_packet->ttl < 2) {
|
|
pr_debug("Warning - can't forward unicast packet from %pM to %pM: ttl exceeded\n",
|
|
ethhdr->h_source, unicast_packet->dest);
|
|
goto out;
|
|
}
|
|
|
|
/* get routing information */
|
|
orig_node = batadv_orig_hash_find(bat_priv, unicast_packet->dest);
|
|
|
|
if (!orig_node)
|
|
goto out;
|
|
|
|
/* create a copy of the skb, if needed, to modify it. */
|
|
if (skb_cow(skb, ETH_HLEN) < 0)
|
|
goto out;
|
|
|
|
/* decrement ttl */
|
|
unicast_packet = (struct batadv_unicast_packet *)skb->data;
|
|
unicast_packet->ttl--;
|
|
|
|
switch (unicast_packet->packet_type) {
|
|
case BATADV_UNICAST_4ADDR:
|
|
hdr_len = sizeof(struct batadv_unicast_4addr_packet);
|
|
break;
|
|
case BATADV_UNICAST:
|
|
hdr_len = sizeof(struct batadv_unicast_packet);
|
|
break;
|
|
default:
|
|
/* other packet types not supported - yet */
|
|
hdr_len = -1;
|
|
break;
|
|
}
|
|
|
|
if (hdr_len > 0)
|
|
batadv_skb_set_priority(skb, hdr_len);
|
|
|
|
len = skb->len;
|
|
res = batadv_send_skb_to_orig(skb, orig_node, recv_if);
|
|
if (res == -1)
|
|
goto out;
|
|
|
|
/* translate transmit result into receive result */
|
|
if (res == NET_XMIT_SUCCESS) {
|
|
/* skb was transmitted and consumed */
|
|
batadv_inc_counter(bat_priv, BATADV_CNT_FORWARD);
|
|
batadv_add_counter(bat_priv, BATADV_CNT_FORWARD_BYTES,
|
|
len + ETH_HLEN);
|
|
}
|
|
|
|
ret = NET_RX_SUCCESS;
|
|
|
|
out:
|
|
if (orig_node)
|
|
batadv_orig_node_put(orig_node);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* batadv_reroute_unicast_packet - update the unicast header for re-routing
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @unicast_packet: the unicast header to be updated
|
|
* @dst_addr: the payload destination
|
|
* @vid: VLAN identifier
|
|
*
|
|
* Search the translation table for dst_addr and update the unicast header with
|
|
* the new corresponding information (originator address where the destination
|
|
* client currently is and its known TTVN)
|
|
*
|
|
* Return: true if the packet header has been updated, false otherwise
|
|
*/
|
|
static bool
|
|
batadv_reroute_unicast_packet(struct batadv_priv *bat_priv,
|
|
struct batadv_unicast_packet *unicast_packet,
|
|
u8 *dst_addr, unsigned short vid)
|
|
{
|
|
struct batadv_orig_node *orig_node = NULL;
|
|
struct batadv_hard_iface *primary_if = NULL;
|
|
bool ret = false;
|
|
u8 *orig_addr, orig_ttvn;
|
|
|
|
if (batadv_is_my_client(bat_priv, dst_addr, vid)) {
|
|
primary_if = batadv_primary_if_get_selected(bat_priv);
|
|
if (!primary_if)
|
|
goto out;
|
|
orig_addr = primary_if->net_dev->dev_addr;
|
|
orig_ttvn = (u8)atomic_read(&bat_priv->tt.vn);
|
|
} else {
|
|
orig_node = batadv_transtable_search(bat_priv, NULL, dst_addr,
|
|
vid);
|
|
if (!orig_node)
|
|
goto out;
|
|
|
|
if (batadv_compare_eth(orig_node->orig, unicast_packet->dest))
|
|
goto out;
|
|
|
|
orig_addr = orig_node->orig;
|
|
orig_ttvn = (u8)atomic_read(&orig_node->last_ttvn);
|
|
}
|
|
|
|
/* update the packet header */
|
|
ether_addr_copy(unicast_packet->dest, orig_addr);
|
|
unicast_packet->ttvn = orig_ttvn;
|
|
|
|
ret = true;
|
|
out:
|
|
if (primary_if)
|
|
batadv_hardif_put(primary_if);
|
|
if (orig_node)
|
|
batadv_orig_node_put(orig_node);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static bool batadv_check_unicast_ttvn(struct batadv_priv *bat_priv,
|
|
struct sk_buff *skb, int hdr_len)
|
|
{
|
|
struct batadv_unicast_packet *unicast_packet;
|
|
struct batadv_hard_iface *primary_if;
|
|
struct batadv_orig_node *orig_node;
|
|
u8 curr_ttvn, old_ttvn;
|
|
struct ethhdr *ethhdr;
|
|
unsigned short vid;
|
|
int is_old_ttvn;
|
|
|
|
/* check if there is enough data before accessing it */
|
|
if (!pskb_may_pull(skb, hdr_len + ETH_HLEN))
|
|
return false;
|
|
|
|
/* create a copy of the skb (in case of for re-routing) to modify it. */
|
|
if (skb_cow(skb, sizeof(*unicast_packet)) < 0)
|
|
return false;
|
|
|
|
unicast_packet = (struct batadv_unicast_packet *)skb->data;
|
|
vid = batadv_get_vid(skb, hdr_len);
|
|
ethhdr = (struct ethhdr *)(skb->data + hdr_len);
|
|
|
|
/* check if the destination client was served by this node and it is now
|
|
* roaming. In this case, it means that the node has got a ROAM_ADV
|
|
* message and that it knows the new destination in the mesh to re-route
|
|
* the packet to
|
|
*/
|
|
if (batadv_tt_local_client_is_roaming(bat_priv, ethhdr->h_dest, vid)) {
|
|
if (batadv_reroute_unicast_packet(bat_priv, unicast_packet,
|
|
ethhdr->h_dest, vid))
|
|
batadv_dbg_ratelimited(BATADV_DBG_TT,
|
|
bat_priv,
|
|
"Rerouting unicast packet to %pM (dst=%pM): Local Roaming\n",
|
|
unicast_packet->dest,
|
|
ethhdr->h_dest);
|
|
/* at this point the mesh destination should have been
|
|
* substituted with the originator address found in the global
|
|
* table. If not, let the packet go untouched anyway because
|
|
* there is nothing the node can do
|
|
*/
|
|
return true;
|
|
}
|
|
|
|
/* retrieve the TTVN known by this node for the packet destination. This
|
|
* value is used later to check if the node which sent (or re-routed
|
|
* last time) the packet had an updated information or not
|
|
*/
|
|
curr_ttvn = (u8)atomic_read(&bat_priv->tt.vn);
|
|
if (!batadv_is_my_mac(bat_priv, unicast_packet->dest)) {
|
|
orig_node = batadv_orig_hash_find(bat_priv,
|
|
unicast_packet->dest);
|
|
/* if it is not possible to find the orig_node representing the
|
|
* destination, the packet can immediately be dropped as it will
|
|
* not be possible to deliver it
|
|
*/
|
|
if (!orig_node)
|
|
return false;
|
|
|
|
curr_ttvn = (u8)atomic_read(&orig_node->last_ttvn);
|
|
batadv_orig_node_put(orig_node);
|
|
}
|
|
|
|
/* check if the TTVN contained in the packet is fresher than what the
|
|
* node knows
|
|
*/
|
|
is_old_ttvn = batadv_seq_before(unicast_packet->ttvn, curr_ttvn);
|
|
if (!is_old_ttvn)
|
|
return true;
|
|
|
|
old_ttvn = unicast_packet->ttvn;
|
|
/* the packet was forged based on outdated network information. Its
|
|
* destination can possibly be updated and forwarded towards the new
|
|
* target host
|
|
*/
|
|
if (batadv_reroute_unicast_packet(bat_priv, unicast_packet,
|
|
ethhdr->h_dest, vid)) {
|
|
batadv_dbg_ratelimited(BATADV_DBG_TT, bat_priv,
|
|
"Rerouting unicast packet to %pM (dst=%pM): TTVN mismatch old_ttvn=%u new_ttvn=%u\n",
|
|
unicast_packet->dest, ethhdr->h_dest,
|
|
old_ttvn, curr_ttvn);
|
|
return true;
|
|
}
|
|
|
|
/* the packet has not been re-routed: either the destination is
|
|
* currently served by this node or there is no destination at all and
|
|
* it is possible to drop the packet
|
|
*/
|
|
if (!batadv_is_my_client(bat_priv, ethhdr->h_dest, vid))
|
|
return false;
|
|
|
|
/* update the header in order to let the packet be delivered to this
|
|
* node's soft interface
|
|
*/
|
|
primary_if = batadv_primary_if_get_selected(bat_priv);
|
|
if (!primary_if)
|
|
return false;
|
|
|
|
ether_addr_copy(unicast_packet->dest, primary_if->net_dev->dev_addr);
|
|
|
|
batadv_hardif_put(primary_if);
|
|
|
|
unicast_packet->ttvn = curr_ttvn;
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* batadv_recv_unhandled_unicast_packet - receive and process packets which
|
|
* are in the unicast number space but not yet known to the implementation
|
|
* @skb: unicast tvlv packet to process
|
|
* @recv_if: pointer to interface this packet was received on
|
|
*
|
|
* Return: NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP
|
|
* otherwise.
|
|
*/
|
|
int batadv_recv_unhandled_unicast_packet(struct sk_buff *skb,
|
|
struct batadv_hard_iface *recv_if)
|
|
{
|
|
struct batadv_unicast_packet *unicast_packet;
|
|
struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
|
|
int check, hdr_size = sizeof(*unicast_packet);
|
|
|
|
check = batadv_check_unicast_packet(bat_priv, skb, hdr_size);
|
|
if (check < 0)
|
|
return NET_RX_DROP;
|
|
|
|
/* we don't know about this type, drop it. */
|
|
unicast_packet = (struct batadv_unicast_packet *)skb->data;
|
|
if (batadv_is_my_mac(bat_priv, unicast_packet->dest))
|
|
return NET_RX_DROP;
|
|
|
|
return batadv_route_unicast_packet(skb, recv_if);
|
|
}
|
|
|
|
int batadv_recv_unicast_packet(struct sk_buff *skb,
|
|
struct batadv_hard_iface *recv_if)
|
|
{
|
|
struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
|
|
struct batadv_unicast_packet *unicast_packet;
|
|
struct batadv_unicast_4addr_packet *unicast_4addr_packet;
|
|
u8 *orig_addr;
|
|
struct batadv_orig_node *orig_node = NULL;
|
|
int check, hdr_size = sizeof(*unicast_packet);
|
|
enum batadv_subtype subtype;
|
|
bool is4addr;
|
|
|
|
unicast_packet = (struct batadv_unicast_packet *)skb->data;
|
|
unicast_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data;
|
|
|
|
is4addr = unicast_packet->packet_type == BATADV_UNICAST_4ADDR;
|
|
/* the caller function should have already pulled 2 bytes */
|
|
if (is4addr)
|
|
hdr_size = sizeof(*unicast_4addr_packet);
|
|
|
|
/* function returns -EREMOTE for promiscuous packets */
|
|
check = batadv_check_unicast_packet(bat_priv, skb, hdr_size);
|
|
|
|
/* Even though the packet is not for us, we might save it to use for
|
|
* decoding a later received coded packet
|
|
*/
|
|
if (check == -EREMOTE)
|
|
batadv_nc_skb_store_sniffed_unicast(bat_priv, skb);
|
|
|
|
if (check < 0)
|
|
return NET_RX_DROP;
|
|
if (!batadv_check_unicast_ttvn(bat_priv, skb, hdr_size))
|
|
return NET_RX_DROP;
|
|
|
|
/* packet for me */
|
|
if (batadv_is_my_mac(bat_priv, unicast_packet->dest)) {
|
|
if (is4addr) {
|
|
subtype = unicast_4addr_packet->subtype;
|
|
batadv_dat_inc_counter(bat_priv, subtype);
|
|
|
|
/* Only payload data should be considered for speedy
|
|
* join. For example, DAT also uses unicast 4addr
|
|
* types, but those packets should not be considered
|
|
* for speedy join, since the clients do not actually
|
|
* reside at the sending originator.
|
|
*/
|
|
if (subtype == BATADV_P_DATA) {
|
|
orig_addr = unicast_4addr_packet->src;
|
|
orig_node = batadv_orig_hash_find(bat_priv,
|
|
orig_addr);
|
|
}
|
|
}
|
|
|
|
if (batadv_dat_snoop_incoming_arp_request(bat_priv, skb,
|
|
hdr_size))
|
|
goto rx_success;
|
|
if (batadv_dat_snoop_incoming_arp_reply(bat_priv, skb,
|
|
hdr_size))
|
|
goto rx_success;
|
|
|
|
batadv_interface_rx(recv_if->soft_iface, skb, hdr_size,
|
|
orig_node);
|
|
|
|
rx_success:
|
|
if (orig_node)
|
|
batadv_orig_node_put(orig_node);
|
|
|
|
return NET_RX_SUCCESS;
|
|
}
|
|
|
|
return batadv_route_unicast_packet(skb, recv_if);
|
|
}
|
|
|
|
/**
|
|
* batadv_recv_unicast_tvlv - receive and process unicast tvlv packets
|
|
* @skb: unicast tvlv packet to process
|
|
* @recv_if: pointer to interface this packet was received on
|
|
*
|
|
* Return: NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP
|
|
* otherwise.
|
|
*/
|
|
int batadv_recv_unicast_tvlv(struct sk_buff *skb,
|
|
struct batadv_hard_iface *recv_if)
|
|
{
|
|
struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
|
|
struct batadv_unicast_tvlv_packet *unicast_tvlv_packet;
|
|
unsigned char *tvlv_buff;
|
|
u16 tvlv_buff_len;
|
|
int hdr_size = sizeof(*unicast_tvlv_packet);
|
|
int ret = NET_RX_DROP;
|
|
|
|
if (batadv_check_unicast_packet(bat_priv, skb, hdr_size) < 0)
|
|
return NET_RX_DROP;
|
|
|
|
/* the header is likely to be modified while forwarding */
|
|
if (skb_cow(skb, hdr_size) < 0)
|
|
return NET_RX_DROP;
|
|
|
|
/* packet needs to be linearized to access the tvlv content */
|
|
if (skb_linearize(skb) < 0)
|
|
return NET_RX_DROP;
|
|
|
|
unicast_tvlv_packet = (struct batadv_unicast_tvlv_packet *)skb->data;
|
|
|
|
tvlv_buff = (unsigned char *)(skb->data + hdr_size);
|
|
tvlv_buff_len = ntohs(unicast_tvlv_packet->tvlv_len);
|
|
|
|
if (tvlv_buff_len > skb->len - hdr_size)
|
|
return NET_RX_DROP;
|
|
|
|
ret = batadv_tvlv_containers_process(bat_priv, false, NULL,
|
|
unicast_tvlv_packet->src,
|
|
unicast_tvlv_packet->dst,
|
|
tvlv_buff, tvlv_buff_len);
|
|
|
|
if (ret != NET_RX_SUCCESS)
|
|
ret = batadv_route_unicast_packet(skb, recv_if);
|
|
else
|
|
consume_skb(skb);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* batadv_recv_frag_packet - process received fragment
|
|
* @skb: the received fragment
|
|
* @recv_if: interface that the skb is received on
|
|
*
|
|
* This function does one of the three following things: 1) Forward fragment, if
|
|
* the assembled packet will exceed our MTU; 2) Buffer fragment, if we till
|
|
* lack further fragments; 3) Merge fragments, if we have all needed parts.
|
|
*
|
|
* Return: NET_RX_DROP if the skb is not consumed, NET_RX_SUCCESS otherwise.
|
|
*/
|
|
int batadv_recv_frag_packet(struct sk_buff *skb,
|
|
struct batadv_hard_iface *recv_if)
|
|
{
|
|
struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
|
|
struct batadv_orig_node *orig_node_src = NULL;
|
|
struct batadv_frag_packet *frag_packet;
|
|
int ret = NET_RX_DROP;
|
|
|
|
if (batadv_check_unicast_packet(bat_priv, skb,
|
|
sizeof(*frag_packet)) < 0)
|
|
goto out;
|
|
|
|
frag_packet = (struct batadv_frag_packet *)skb->data;
|
|
orig_node_src = batadv_orig_hash_find(bat_priv, frag_packet->orig);
|
|
if (!orig_node_src)
|
|
goto out;
|
|
|
|
skb->priority = frag_packet->priority + 256;
|
|
|
|
/* Route the fragment if it is not for us and too big to be merged. */
|
|
if (!batadv_is_my_mac(bat_priv, frag_packet->dest) &&
|
|
batadv_frag_skb_fwd(skb, recv_if, orig_node_src)) {
|
|
ret = NET_RX_SUCCESS;
|
|
goto out;
|
|
}
|
|
|
|
batadv_inc_counter(bat_priv, BATADV_CNT_FRAG_RX);
|
|
batadv_add_counter(bat_priv, BATADV_CNT_FRAG_RX_BYTES, skb->len);
|
|
|
|
/* Add fragment to buffer and merge if possible. */
|
|
if (!batadv_frag_skb_buffer(&skb, orig_node_src))
|
|
goto out;
|
|
|
|
/* Deliver merged packet to the appropriate handler, if it was
|
|
* merged
|
|
*/
|
|
if (skb)
|
|
batadv_batman_skb_recv(skb, recv_if->net_dev,
|
|
&recv_if->batman_adv_ptype, NULL);
|
|
|
|
ret = NET_RX_SUCCESS;
|
|
|
|
out:
|
|
if (orig_node_src)
|
|
batadv_orig_node_put(orig_node_src);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int batadv_recv_bcast_packet(struct sk_buff *skb,
|
|
struct batadv_hard_iface *recv_if)
|
|
{
|
|
struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
|
|
struct batadv_orig_node *orig_node = NULL;
|
|
struct batadv_bcast_packet *bcast_packet;
|
|
struct ethhdr *ethhdr;
|
|
int hdr_size = sizeof(*bcast_packet);
|
|
int ret = NET_RX_DROP;
|
|
s32 seq_diff;
|
|
u32 seqno;
|
|
|
|
/* drop packet if it has not necessary minimum size */
|
|
if (unlikely(!pskb_may_pull(skb, hdr_size)))
|
|
goto out;
|
|
|
|
ethhdr = eth_hdr(skb);
|
|
|
|
/* packet with broadcast indication but unicast recipient */
|
|
if (!is_broadcast_ether_addr(ethhdr->h_dest))
|
|
goto out;
|
|
|
|
/* packet with broadcast sender address */
|
|
if (is_broadcast_ether_addr(ethhdr->h_source))
|
|
goto out;
|
|
|
|
/* ignore broadcasts sent by myself */
|
|
if (batadv_is_my_mac(bat_priv, ethhdr->h_source))
|
|
goto out;
|
|
|
|
bcast_packet = (struct batadv_bcast_packet *)skb->data;
|
|
|
|
/* ignore broadcasts originated by myself */
|
|
if (batadv_is_my_mac(bat_priv, bcast_packet->orig))
|
|
goto out;
|
|
|
|
if (bcast_packet->ttl < 2)
|
|
goto out;
|
|
|
|
orig_node = batadv_orig_hash_find(bat_priv, bcast_packet->orig);
|
|
|
|
if (!orig_node)
|
|
goto out;
|
|
|
|
spin_lock_bh(&orig_node->bcast_seqno_lock);
|
|
|
|
seqno = ntohl(bcast_packet->seqno);
|
|
/* check whether the packet is a duplicate */
|
|
if (batadv_test_bit(orig_node->bcast_bits, orig_node->last_bcast_seqno,
|
|
seqno))
|
|
goto spin_unlock;
|
|
|
|
seq_diff = seqno - orig_node->last_bcast_seqno;
|
|
|
|
/* check whether the packet is old and the host just restarted. */
|
|
if (batadv_window_protected(bat_priv, seq_diff,
|
|
BATADV_BCAST_MAX_AGE,
|
|
&orig_node->bcast_seqno_reset, NULL))
|
|
goto spin_unlock;
|
|
|
|
/* mark broadcast in flood history, update window position
|
|
* if required.
|
|
*/
|
|
if (batadv_bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1))
|
|
orig_node->last_bcast_seqno = seqno;
|
|
|
|
spin_unlock_bh(&orig_node->bcast_seqno_lock);
|
|
|
|
/* check whether this has been sent by another originator before */
|
|
if (batadv_bla_check_bcast_duplist(bat_priv, skb))
|
|
goto out;
|
|
|
|
batadv_skb_set_priority(skb, sizeof(struct batadv_bcast_packet));
|
|
|
|
/* rebroadcast packet */
|
|
batadv_add_bcast_packet_to_list(bat_priv, skb, 1);
|
|
|
|
/* don't hand the broadcast up if it is from an originator
|
|
* from the same backbone.
|
|
*/
|
|
if (batadv_bla_is_backbone_gw(skb, orig_node, hdr_size))
|
|
goto out;
|
|
|
|
if (batadv_dat_snoop_incoming_arp_request(bat_priv, skb, hdr_size))
|
|
goto rx_success;
|
|
if (batadv_dat_snoop_incoming_arp_reply(bat_priv, skb, hdr_size))
|
|
goto rx_success;
|
|
|
|
/* broadcast for me */
|
|
batadv_interface_rx(recv_if->soft_iface, skb, hdr_size, orig_node);
|
|
|
|
rx_success:
|
|
ret = NET_RX_SUCCESS;
|
|
goto out;
|
|
|
|
spin_unlock:
|
|
spin_unlock_bh(&orig_node->bcast_seqno_lock);
|
|
out:
|
|
if (orig_node)
|
|
batadv_orig_node_put(orig_node);
|
|
return ret;
|
|
}
|