3fba7325bb
If possible, operations like ntohs/ntohl should not be performed too often. Use a variable to locally store the converted value and then use it. Signed-off-by: Antonio Quartulli <antonio@open-mesh.com> Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch> Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
1229 lines
34 KiB
C
1229 lines
34 KiB
C
/* Copyright (C) 2007-2013 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, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA
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*/
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#include "main.h"
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#include "routing.h"
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#include "send.h"
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#include "soft-interface.h"
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#include "hard-interface.h"
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#include "icmp_socket.h"
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#include "translation-table.h"
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#include "originator.h"
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#include "bridge_loop_avoidance.h"
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#include "distributed-arp-table.h"
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#include "network-coding.h"
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#include "fragmentation.h"
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#include <linux/if_vlan.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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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_neigh_node *neigh_node)
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{
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struct batadv_neigh_node *curr_router;
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curr_router = batadv_orig_node_get_router(orig_node);
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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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if (curr_router)
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batadv_neigh_node_free_ref(curr_router);
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/* increase refcount of new best neighbor */
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if (neigh_node && !atomic_inc_not_zero(&neigh_node->refcount))
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neigh_node = NULL;
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spin_lock_bh(&orig_node->neigh_list_lock);
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rcu_assign_pointer(orig_node->router, neigh_node);
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spin_unlock_bh(&orig_node->neigh_list_lock);
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/* decrease refcount of previous best neighbor */
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if (curr_router)
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batadv_neigh_node_free_ref(curr_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_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_node_get_router(orig_node);
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if (router != neigh_node)
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_batadv_update_route(bat_priv, orig_node, neigh_node);
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out:
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if (router)
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batadv_neigh_node_free_ref(router);
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}
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/* caller must hold the neigh_list_lock */
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void batadv_bonding_candidate_del(struct batadv_orig_node *orig_node,
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struct batadv_neigh_node *neigh_node)
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{
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/* this neighbor is not part of our candidate list */
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if (list_empty(&neigh_node->bonding_list))
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goto out;
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list_del_rcu(&neigh_node->bonding_list);
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INIT_LIST_HEAD(&neigh_node->bonding_list);
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batadv_neigh_node_free_ref(neigh_node);
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atomic_dec(&orig_node->bond_candidates);
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out:
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return;
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}
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/**
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* batadv_bonding_candidate_add - consider a new link for bonding mode towards
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* the given originator
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* @bat_priv: the bat priv with all the soft interface information
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* @orig_node: the target node
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* @neigh_node: the neighbor representing the new link to consider for bonding
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* mode
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*/
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void batadv_bonding_candidate_add(struct batadv_priv *bat_priv,
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struct batadv_orig_node *orig_node,
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struct batadv_neigh_node *neigh_node)
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{
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struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
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struct batadv_neigh_node *tmp_neigh_node, *router = NULL;
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uint8_t interference_candidate = 0;
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spin_lock_bh(&orig_node->neigh_list_lock);
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/* only consider if it has the same primary address ... */
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if (!batadv_compare_eth(orig_node->orig,
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neigh_node->orig_node->primary_addr))
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goto candidate_del;
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router = batadv_orig_node_get_router(orig_node);
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if (!router)
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goto candidate_del;
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/* ... and is good enough to be considered */
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if (bao->bat_neigh_is_equiv_or_better(neigh_node, router))
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goto candidate_del;
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/* check if we have another candidate with the same mac address or
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* interface. If we do, we won't select this candidate because of
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* possible interference.
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*/
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hlist_for_each_entry_rcu(tmp_neigh_node,
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&orig_node->neigh_list, list) {
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if (tmp_neigh_node == neigh_node)
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continue;
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/* we only care if the other candidate is even
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* considered as candidate.
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*/
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if (list_empty(&tmp_neigh_node->bonding_list))
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continue;
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if ((neigh_node->if_incoming == tmp_neigh_node->if_incoming) ||
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(batadv_compare_eth(neigh_node->addr,
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tmp_neigh_node->addr))) {
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interference_candidate = 1;
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break;
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}
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}
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/* don't care further if it is an interference candidate */
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if (interference_candidate)
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goto candidate_del;
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/* this neighbor already is part of our candidate list */
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if (!list_empty(&neigh_node->bonding_list))
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goto out;
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if (!atomic_inc_not_zero(&neigh_node->refcount))
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goto out;
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list_add_rcu(&neigh_node->bonding_list, &orig_node->bond_list);
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atomic_inc(&orig_node->bond_candidates);
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goto out;
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candidate_del:
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batadv_bonding_candidate_del(orig_node, neigh_node);
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out:
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spin_unlock_bh(&orig_node->neigh_list_lock);
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if (router)
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batadv_neigh_node_free_ref(router);
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}
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/* copy primary address for bonding */
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void
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batadv_bonding_save_primary(const struct batadv_orig_node *orig_node,
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struct batadv_orig_node *orig_neigh_node,
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const struct batadv_ogm_packet *batman_ogm_packet)
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{
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if (!(batman_ogm_packet->flags & BATADV_PRIMARIES_FIRST_HOP))
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return;
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memcpy(orig_neigh_node->primary_addr, orig_node->orig, ETH_ALEN);
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}
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/* checks whether the host restarted and is in the protection time.
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* returns:
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* 0 if the packet is to be accepted
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* 1 if the packet is to be ignored.
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*/
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int batadv_window_protected(struct batadv_priv *bat_priv, int32_t seq_num_diff,
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unsigned long *last_reset)
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{
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if (seq_num_diff <= -BATADV_TQ_LOCAL_WINDOW_SIZE ||
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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 1;
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*last_reset = jiffies;
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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 0;
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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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* Returns 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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memcpy(icmph->dst, icmph->orig, ETH_ALEN);
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memcpy(icmph->orig, primary_if->net_dev->dev_addr, ETH_ALEN);
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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 != NET_XMIT_DROP)
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ret = NET_RX_SUCCESS;
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break;
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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_free_ref(primary_if);
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if (orig_node)
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batadv_orig_node_free_ref(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 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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memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN);
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memcpy(icmp_packet->orig, primary_if->net_dev->dev_addr,
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ETH_ALEN);
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icmp_packet->msg_type = BATADV_TTL_EXCEEDED;
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icmp_packet->ttl = BATADV_TTL;
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if (batadv_send_skb_to_orig(skb, orig_node, NULL) != NET_XMIT_DROP)
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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_free_ref(primary_if);
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if (orig_node)
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batadv_orig_node_free_ref(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 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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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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memcpy(&(icmp_packet_rr->rr[icmp_packet_rr->rr_cur]),
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ethhdr->h_dest, ETH_ALEN);
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icmp_packet_rr->rr_cur++;
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}
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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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|
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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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|
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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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|
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/* decrement ttl */
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icmph->ttl--;
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|
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/* route it */
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if (batadv_send_skb_to_orig(skb, orig_node, recv_if) != NET_XMIT_DROP)
|
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ret = NET_RX_SUCCESS;
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|
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out:
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if (orig_node)
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batadv_orig_node_free_ref(orig_node);
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return ret;
|
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}
|
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|
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/* In the bonding case, send the packets in a round
|
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* robin fashion over the remaining interfaces.
|
|
*
|
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* This method rotates the bonding list and increases the
|
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* returned router's refcount.
|
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*/
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static struct batadv_neigh_node *
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batadv_find_bond_router(struct batadv_orig_node *primary_orig,
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const struct batadv_hard_iface *recv_if)
|
|
{
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struct batadv_neigh_node *tmp_neigh_node;
|
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struct batadv_neigh_node *router = NULL, *first_candidate = NULL;
|
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|
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rcu_read_lock();
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list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list,
|
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bonding_list) {
|
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if (!first_candidate)
|
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first_candidate = tmp_neigh_node;
|
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|
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/* recv_if == NULL on the first node. */
|
|
if (tmp_neigh_node->if_incoming == recv_if)
|
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continue;
|
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|
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if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
|
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continue;
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|
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router = tmp_neigh_node;
|
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break;
|
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}
|
|
|
|
/* use the first candidate if nothing was found. */
|
|
if (!router && first_candidate &&
|
|
atomic_inc_not_zero(&first_candidate->refcount))
|
|
router = first_candidate;
|
|
|
|
if (!router)
|
|
goto out;
|
|
|
|
/* selected should point to the next element
|
|
* after the current router
|
|
*/
|
|
spin_lock_bh(&primary_orig->neigh_list_lock);
|
|
/* this is a list_move(), which unfortunately
|
|
* does not exist as rcu version
|
|
*/
|
|
list_del_rcu(&primary_orig->bond_list);
|
|
list_add_rcu(&primary_orig->bond_list,
|
|
&router->bonding_list);
|
|
spin_unlock_bh(&primary_orig->neigh_list_lock);
|
|
|
|
out:
|
|
rcu_read_unlock();
|
|
return router;
|
|
}
|
|
|
|
/**
|
|
* batadv_find_ifalter_router - find the best of the remaining candidates which
|
|
* are not using this interface
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @primary_orig: the destination
|
|
* @recv_if: the interface that the router returned by this function has to not
|
|
* use
|
|
*
|
|
* Returns the best candidate towards primary_orig that is not using recv_if.
|
|
* Increases the returned neighbor's refcount
|
|
*/
|
|
static struct batadv_neigh_node *
|
|
batadv_find_ifalter_router(struct batadv_priv *bat_priv,
|
|
struct batadv_orig_node *primary_orig,
|
|
const struct batadv_hard_iface *recv_if)
|
|
{
|
|
struct batadv_neigh_node *router = NULL, *first_candidate = NULL;
|
|
struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
|
|
struct batadv_neigh_node *tmp_neigh_node;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list,
|
|
bonding_list) {
|
|
if (!first_candidate)
|
|
first_candidate = tmp_neigh_node;
|
|
|
|
/* recv_if == NULL on the first node. */
|
|
if (tmp_neigh_node->if_incoming == recv_if)
|
|
continue;
|
|
|
|
if (router && bao->bat_neigh_cmp(tmp_neigh_node, router))
|
|
continue;
|
|
|
|
if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
|
|
continue;
|
|
|
|
/* decrement refcount of previously selected router */
|
|
if (router)
|
|
batadv_neigh_node_free_ref(router);
|
|
|
|
/* we found a better router (or at least one valid router) */
|
|
router = tmp_neigh_node;
|
|
}
|
|
|
|
/* use the first candidate if nothing was found. */
|
|
if (!router && first_candidate &&
|
|
atomic_inc_not_zero(&first_candidate->refcount))
|
|
router = first_candidate;
|
|
|
|
rcu_read_unlock();
|
|
return router;
|
|
}
|
|
|
|
/**
|
|
* batadv_check_unicast_packet - Check for malformed unicast packets
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @skb: packet to check
|
|
* @hdr_size: size of header to pull
|
|
*
|
|
* Check for short header and bad addresses in given packet. Returns negative
|
|
* value when check fails and 0 otherwise. The negative value depends on the
|
|
* reason: -ENODATA for bad header, -EBADR for broadcast destination or source,
|
|
* and -EREMOTE for non-local (other host) destination.
|
|
*/
|
|
static int batadv_check_unicast_packet(struct batadv_priv *bat_priv,
|
|
struct sk_buff *skb, int hdr_size)
|
|
{
|
|
struct ethhdr *ethhdr;
|
|
|
|
/* drop packet if it has not necessary minimum size */
|
|
if (unlikely(!pskb_may_pull(skb, hdr_size)))
|
|
return -ENODATA;
|
|
|
|
ethhdr = eth_hdr(skb);
|
|
|
|
/* packet with unicast indication but broadcast recipient */
|
|
if (is_broadcast_ether_addr(ethhdr->h_dest))
|
|
return -EBADR;
|
|
|
|
/* packet with broadcast sender address */
|
|
if (is_broadcast_ether_addr(ethhdr->h_source))
|
|
return -EBADR;
|
|
|
|
/* not for me */
|
|
if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest))
|
|
return -EREMOTE;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* find a suitable router for this originator, and use
|
|
* bonding if possible. increases the found neighbors
|
|
* refcount.
|
|
*/
|
|
struct batadv_neigh_node *
|
|
batadv_find_router(struct batadv_priv *bat_priv,
|
|
struct batadv_orig_node *orig_node,
|
|
const struct batadv_hard_iface *recv_if)
|
|
{
|
|
struct batadv_orig_node *primary_orig_node;
|
|
struct batadv_orig_node *router_orig;
|
|
struct batadv_neigh_node *router;
|
|
static uint8_t zero_mac[ETH_ALEN] = {0, 0, 0, 0, 0, 0};
|
|
int bonding_enabled;
|
|
uint8_t *primary_addr;
|
|
|
|
if (!orig_node)
|
|
return NULL;
|
|
|
|
router = batadv_orig_node_get_router(orig_node);
|
|
if (!router)
|
|
goto err;
|
|
|
|
/* without bonding, the first node should
|
|
* always choose the default router.
|
|
*/
|
|
bonding_enabled = atomic_read(&bat_priv->bonding);
|
|
|
|
rcu_read_lock();
|
|
/* select default router to output */
|
|
router_orig = router->orig_node;
|
|
if (!router_orig)
|
|
goto err_unlock;
|
|
|
|
if ((!recv_if) && (!bonding_enabled))
|
|
goto return_router;
|
|
|
|
primary_addr = router_orig->primary_addr;
|
|
|
|
/* if we have something in the primary_addr, we can search
|
|
* for a potential bonding candidate.
|
|
*/
|
|
if (batadv_compare_eth(primary_addr, zero_mac))
|
|
goto return_router;
|
|
|
|
/* find the orig_node which has the primary interface. might
|
|
* even be the same as our router_orig in many cases
|
|
*/
|
|
if (batadv_compare_eth(primary_addr, router_orig->orig)) {
|
|
primary_orig_node = router_orig;
|
|
} else {
|
|
primary_orig_node = batadv_orig_hash_find(bat_priv,
|
|
primary_addr);
|
|
if (!primary_orig_node)
|
|
goto return_router;
|
|
|
|
batadv_orig_node_free_ref(primary_orig_node);
|
|
}
|
|
|
|
/* with less than 2 candidates, we can't do any
|
|
* bonding and prefer the original router.
|
|
*/
|
|
if (atomic_read(&primary_orig_node->bond_candidates) < 2)
|
|
goto return_router;
|
|
|
|
/* all nodes between should choose a candidate which
|
|
* is is not on the interface where the packet came
|
|
* in.
|
|
*/
|
|
batadv_neigh_node_free_ref(router);
|
|
|
|
if (bonding_enabled)
|
|
router = batadv_find_bond_router(primary_orig_node, recv_if);
|
|
else
|
|
router = batadv_find_ifalter_router(bat_priv, primary_orig_node,
|
|
recv_if);
|
|
|
|
return_router:
|
|
if (router && router->if_incoming->if_status != BATADV_IF_ACTIVE)
|
|
goto err_unlock;
|
|
|
|
rcu_read_unlock();
|
|
return router;
|
|
err_unlock:
|
|
rcu_read_unlock();
|
|
err:
|
|
if (router)
|
|
batadv_neigh_node_free_ref(router);
|
|
return NULL;
|
|
}
|
|
|
|
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;
|
|
|
|
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);
|
|
|
|
res = batadv_send_skb_to_orig(skb, orig_node, recv_if);
|
|
|
|
/* 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,
|
|
skb->len + ETH_HLEN);
|
|
|
|
ret = NET_RX_SUCCESS;
|
|
} else if (res == NET_XMIT_POLICED) {
|
|
/* skb was buffered and consumed */
|
|
ret = NET_RX_SUCCESS;
|
|
}
|
|
|
|
out:
|
|
if (orig_node)
|
|
batadv_orig_node_free_ref(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)
|
|
*
|
|
* Returns 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,
|
|
uint8_t *dst_addr, unsigned short vid)
|
|
{
|
|
struct batadv_orig_node *orig_node = NULL;
|
|
struct batadv_hard_iface *primary_if = NULL;
|
|
bool ret = false;
|
|
uint8_t *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 = (uint8_t)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 = (uint8_t)atomic_read(&orig_node->last_ttvn);
|
|
}
|
|
|
|
/* update the packet header */
|
|
memcpy(unicast_packet->dest, orig_addr, ETH_ALEN);
|
|
unicast_packet->ttvn = orig_ttvn;
|
|
|
|
ret = true;
|
|
out:
|
|
if (primary_if)
|
|
batadv_hardif_free_ref(primary_if);
|
|
if (orig_node)
|
|
batadv_orig_node_free_ref(orig_node);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int 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;
|
|
uint8_t 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) < 0)
|
|
return 0;
|
|
|
|
/* create a copy of the skb (in case of for re-routing) to modify it. */
|
|
if (skb_cow(skb, sizeof(*unicast_packet)) < 0)
|
|
return 0;
|
|
|
|
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))
|
|
net_ratelimited_function(batadv_dbg, 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 1;
|
|
}
|
|
|
|
/* 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 = (uint8_t)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 0;
|
|
|
|
curr_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn);
|
|
batadv_orig_node_free_ref(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 1;
|
|
|
|
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)) {
|
|
net_ratelimited_function(batadv_dbg, 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 1;
|
|
}
|
|
|
|
/* 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 0;
|
|
|
|
/* 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 0;
|
|
|
|
memcpy(unicast_packet->dest, primary_if->net_dev->dev_addr, ETH_ALEN);
|
|
|
|
batadv_hardif_free_ref(primary_if);
|
|
|
|
unicast_packet->ttvn = curr_ttvn;
|
|
|
|
return 1;
|
|
}
|
|
|
|
/**
|
|
* 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
|
|
*
|
|
* Returns 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;
|
|
uint8_t *orig_addr;
|
|
struct batadv_orig_node *orig_node = NULL;
|
|
int check, hdr_size = sizeof(*unicast_packet);
|
|
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) {
|
|
batadv_dat_inc_counter(bat_priv,
|
|
unicast_4addr_packet->subtype);
|
|
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, recv_if, hdr_size,
|
|
orig_node);
|
|
|
|
rx_success:
|
|
if (orig_node)
|
|
batadv_orig_node_free_ref(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
|
|
* @dst_addr: the payload destination
|
|
*
|
|
* Returns 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;
|
|
uint16_t 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);
|
|
|
|
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;
|
|
|
|
/* 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_free_ref(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;
|
|
int32_t seq_diff;
|
|
uint32_t 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,
|
|
&orig_node->bcast_seqno_reset))
|
|
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, recv_if, 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_free_ref(orig_node);
|
|
return ret;
|
|
}
|