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1273 lines
36 KiB
1273 lines
36 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* Copyright (C) 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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|
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#include "routing.h" |
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#include "main.h" |
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|
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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 <uapi/linux/batadv_packet.h> |
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|
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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 "log.h" |
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#include "network-coding.h" |
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#include "originator.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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|
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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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/** |
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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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|
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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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curr_router = rcu_replace_pointer(orig_ifinfo->router, neigh_node, |
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true); |
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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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|
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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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|
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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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|
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/* decrease refcount of previous best neighbor */ |
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batadv_neigh_node_put(curr_router); |
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} |
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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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|
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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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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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|
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return false; |
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} |
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/** |
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* batadv_check_management_packet() - Check preconditions for management packets |
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* @skb: incoming packet buffer |
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* @hard_iface: incoming hard interface |
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* @header_len: minimal header length of packet type |
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* |
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* Return: true when management preconditions are met, false otherwise |
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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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|
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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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|
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/* packet with invalid sender address */ |
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if (!is_valid_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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|
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switch (icmph->msg_type) { |
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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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|
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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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|
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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 == NET_XMIT_SUCCESS) |
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ret = NET_RX_SUCCESS; |
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/* skb was consumed */ |
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skb = NULL; |
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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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/* skb was consumed */ |
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skb = NULL; |
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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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batadv_hardif_put(primary_if); |
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batadv_orig_node_put(orig_node); |
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kfree_skb(skb); |
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|
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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 == NET_RX_SUCCESS) |
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ret = NET_XMIT_SUCCESS; |
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/* skb was consumed */ |
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skb = NULL; |
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out: |
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batadv_hardif_put(primary_if); |
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batadv_orig_node_put(orig_node); |
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kfree_skb(skb); |
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return ret; |
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} |
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/** |
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* batadv_recv_icmp_packet() - Process incoming icmp packet |
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* @skb: incoming packet buffer |
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* @recv_if: incoming hard interface |
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* |
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* Return: NET_RX_SUCCESS on success or NET_RX_DROP in case of failure |
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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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|
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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 free_skb; |
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ethhdr = eth_hdr(skb); |
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|
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/* packet with unicast indication but non-unicast recipient */ |
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if (!is_valid_ether_addr(ethhdr->h_dest)) |
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goto free_skb; |
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|
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/* packet with broadcast/multicast sender address */ |
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if (is_multicast_ether_addr(ethhdr->h_source)) |
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goto free_skb; |
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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 free_skb; |
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icmph = (struct batadv_icmp_header *)skb->data; |
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|
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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 free_skb; |
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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 free_skb; |
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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 free_skb; |
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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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|
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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 free_skb; |
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|
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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 put_orig_node; |
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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 == NET_XMIT_SUCCESS) |
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ret = NET_RX_SUCCESS; |
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/* skb was consumed */ |
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skb = NULL; |
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|
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put_orig_node: |
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batadv_orig_node_put(orig_node); |
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free_skb: |
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kfree_skb(skb); |
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|
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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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* Checks for short header and bad addresses in the 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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ethhdr = eth_hdr(skb); |
|
|
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/* packet with unicast indication but non-unicast recipient */ |
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if (!is_valid_ether_addr(ethhdr->h_dest)) |
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return -EBADR; |
|
|
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/* packet with broadcast/multicast sender address */ |
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if (is_multicast_ether_addr(ethhdr->h_source)) |
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return -EBADR; |
|
|
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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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return 0; |
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} |
|
|
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/** |
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* batadv_last_bonding_get() - Get last_bonding_candidate of orig_node |
|
* @orig_node: originator node whose last bonding candidate should be retrieved |
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* |
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* Return: last bonding candidate of router or NULL if not found |
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* |
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* The object is returned with refcounter increased by 1. |
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*/ |
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static struct batadv_orig_ifinfo * |
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batadv_last_bonding_get(struct batadv_orig_node *orig_node) |
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{ |
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struct batadv_orig_ifinfo *last_bonding_candidate; |
|
|
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spin_lock_bh(&orig_node->neigh_list_lock); |
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last_bonding_candidate = orig_node->last_bonding_candidate; |
|
|
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if (last_bonding_candidate) |
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kref_get(&last_bonding_candidate->refcount); |
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spin_unlock_bh(&orig_node->neigh_list_lock); |
|
|
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return last_bonding_candidate; |
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} |
|
|
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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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*/ |
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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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{ |
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struct batadv_orig_ifinfo *old_candidate; |
|
|
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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); |
|
orig_node->last_bonding_candidate = new_candidate; |
|
spin_unlock_bh(&orig_node->neigh_list_lock); |
|
|
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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 |
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* @recv_if: pointer to interface this packet was received on |
|
* |
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* Return: the router which should be used for this orig_node on |
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* this interface, or NULL if not available. |
|
*/ |
|
struct batadv_neigh_node * |
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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 = batadv_last_bonding_get(orig_node); |
|
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); |
|
} |
|
|
|
batadv_orig_ifinfo_put(last_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 free_skb; |
|
} |
|
|
|
/* get routing information */ |
|
orig_node = batadv_orig_hash_find(bat_priv, unicast_packet->dest); |
|
|
|
if (!orig_node) |
|
goto free_skb; |
|
|
|
/* create a copy of the skb, if needed, to modify it. */ |
|
if (skb_cow(skb, ETH_HLEN) < 0) |
|
goto put_orig_node; |
|
|
|
/* 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); |
|
|
|
/* translate transmit result into receive result */ |
|
if (res == NET_XMIT_SUCCESS) { |
|
ret = NET_RX_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); |
|
} |
|
|
|
/* skb was consumed */ |
|
skb = NULL; |
|
|
|
put_orig_node: |
|
batadv_orig_node_put(orig_node); |
|
free_skb: |
|
kfree_skb(skb); |
|
|
|
return ret; |
|
} |
|
|
|
/** |
|
* batadv_reroute_unicast_packet() - update the unicast header for re-routing |
|
* @bat_priv: the bat priv with all the soft interface information |
|
* @skb: unicast packet to process |
|
* @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 sk_buff *skb, |
|
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; |
|
const u8 *orig_addr; |
|
u8 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 */ |
|
skb_postpull_rcsum(skb, unicast_packet, sizeof(*unicast_packet)); |
|
ether_addr_copy(unicast_packet->dest, orig_addr); |
|
unicast_packet->ttvn = orig_ttvn; |
|
skb_postpush_rcsum(skb, unicast_packet, sizeof(*unicast_packet)); |
|
|
|
ret = true; |
|
out: |
|
batadv_hardif_put(primary_if); |
|
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); |
|
|
|
/* do not reroute multicast frames in a unicast header */ |
|
if (is_multicast_ether_addr(ethhdr->h_dest)) |
|
return true; |
|
|
|
/* 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, skb, 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, skb, 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; |
|
|
|
/* update the packet header */ |
|
skb_postpull_rcsum(skb, unicast_packet, sizeof(*unicast_packet)); |
|
ether_addr_copy(unicast_packet->dest, primary_if->net_dev->dev_addr); |
|
unicast_packet->ttvn = curr_ttvn; |
|
skb_postpush_rcsum(skb, unicast_packet, sizeof(*unicast_packet)); |
|
|
|
batadv_hardif_put(primary_if); |
|
|
|
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) |
|
goto free_skb; |
|
|
|
/* 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)) |
|
goto free_skb; |
|
|
|
return batadv_route_unicast_packet(skb, recv_if); |
|
|
|
free_skb: |
|
kfree_skb(skb); |
|
return NET_RX_DROP; |
|
} |
|
|
|
/** |
|
* batadv_recv_unicast_packet() - Process incoming unicast packet |
|
* @skb: incoming packet buffer |
|
* @recv_if: incoming hard interface |
|
* |
|
* Return: NET_RX_SUCCESS on success or NET_RX_DROP in case of failure |
|
*/ |
|
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, *orig_addr_gw; |
|
struct batadv_orig_node *orig_node = NULL, *orig_node_gw = NULL; |
|
int check, hdr_size = sizeof(*unicast_packet); |
|
enum batadv_subtype subtype; |
|
int ret = NET_RX_DROP; |
|
bool is4addr, is_gw; |
|
|
|
unicast_packet = (struct batadv_unicast_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) |
|
goto free_skb; |
|
if (!batadv_check_unicast_ttvn(bat_priv, skb, hdr_size)) |
|
goto free_skb; |
|
|
|
unicast_packet = (struct batadv_unicast_packet *)skb->data; |
|
|
|
/* packet for me */ |
|
if (batadv_is_my_mac(bat_priv, unicast_packet->dest)) { |
|
/* If this is a unicast packet from another backgone gw, |
|
* drop it. |
|
*/ |
|
orig_addr_gw = eth_hdr(skb)->h_source; |
|
orig_node_gw = batadv_orig_hash_find(bat_priv, orig_addr_gw); |
|
if (orig_node_gw) { |
|
is_gw = batadv_bla_is_backbone_gw(skb, orig_node_gw, |
|
hdr_size); |
|
batadv_orig_node_put(orig_node_gw); |
|
if (is_gw) { |
|
batadv_dbg(BATADV_DBG_BLA, bat_priv, |
|
"%s(): Dropped unicast pkt received from another backbone gw %pM.\n", |
|
__func__, orig_addr_gw); |
|
goto free_skb; |
|
} |
|
} |
|
|
|
if (is4addr) { |
|
unicast_4addr_packet = |
|
(struct batadv_unicast_4addr_packet *)skb->data; |
|
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_dat_snoop_incoming_dhcp_ack(bat_priv, skb, hdr_size); |
|
|
|
batadv_interface_rx(recv_if->soft_iface, skb, hdr_size, |
|
orig_node); |
|
|
|
rx_success: |
|
batadv_orig_node_put(orig_node); |
|
|
|
return NET_RX_SUCCESS; |
|
} |
|
|
|
ret = batadv_route_unicast_packet(skb, recv_if); |
|
/* skb was consumed */ |
|
skb = NULL; |
|
|
|
free_skb: |
|
kfree_skb(skb); |
|
|
|
return ret; |
|
} |
|
|
|
/** |
|
* 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) |
|
goto free_skb; |
|
|
|
/* the header is likely to be modified while forwarding */ |
|
if (skb_cow(skb, hdr_size) < 0) |
|
goto free_skb; |
|
|
|
/* packet needs to be linearized to access the tvlv content */ |
|
if (skb_linearize(skb) < 0) |
|
goto free_skb; |
|
|
|
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) |
|
goto free_skb; |
|
|
|
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); |
|
/* skb was consumed */ |
|
skb = NULL; |
|
} |
|
|
|
free_skb: |
|
kfree_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 still |
|
* 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 free_skb; |
|
|
|
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 free_skb; |
|
|
|
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)) { |
|
/* skb was consumed */ |
|
skb = NULL; |
|
ret = NET_RX_SUCCESS; |
|
goto put_orig_node; |
|
} |
|
|
|
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 put_orig_node; |
|
|
|
/* 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); |
|
/* skb was consumed */ |
|
skb = NULL; |
|
} |
|
|
|
ret = NET_RX_SUCCESS; |
|
|
|
put_orig_node: |
|
batadv_orig_node_put(orig_node_src); |
|
free_skb: |
|
kfree_skb(skb); |
|
|
|
return ret; |
|
} |
|
|
|
/** |
|
* batadv_recv_bcast_packet() - Process incoming broadcast packet |
|
* @skb: incoming packet buffer |
|
* @recv_if: incoming hard interface |
|
* |
|
* Return: NET_RX_SUCCESS on success or NET_RX_DROP in case of failure |
|
*/ |
|
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); |
|
s32 seq_diff; |
|
u32 seqno; |
|
int ret; |
|
|
|
/* drop packet if it has not necessary minimum size */ |
|
if (unlikely(!pskb_may_pull(skb, hdr_size))) |
|
goto free_skb; |
|
|
|
ethhdr = eth_hdr(skb); |
|
|
|
/* packet with broadcast indication but unicast recipient */ |
|
if (!is_broadcast_ether_addr(ethhdr->h_dest)) |
|
goto free_skb; |
|
|
|
/* packet with broadcast/multicast sender address */ |
|
if (is_multicast_ether_addr(ethhdr->h_source)) |
|
goto free_skb; |
|
|
|
/* ignore broadcasts sent by myself */ |
|
if (batadv_is_my_mac(bat_priv, ethhdr->h_source)) |
|
goto free_skb; |
|
|
|
bcast_packet = (struct batadv_bcast_packet *)skb->data; |
|
|
|
/* ignore broadcasts originated by myself */ |
|
if (batadv_is_my_mac(bat_priv, bcast_packet->orig)) |
|
goto free_skb; |
|
|
|
if (bcast_packet->ttl-- < 2) |
|
goto free_skb; |
|
|
|
orig_node = batadv_orig_hash_find(bat_priv, bcast_packet->orig); |
|
|
|
if (!orig_node) |
|
goto free_skb; |
|
|
|
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 free_skb; |
|
|
|
batadv_skb_set_priority(skb, sizeof(struct batadv_bcast_packet)); |
|
|
|
/* rebroadcast packet */ |
|
ret = batadv_forw_bcast_packet(bat_priv, skb, 0, false); |
|
if (ret == NETDEV_TX_BUSY) |
|
goto free_skb; |
|
|
|
/* 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 free_skb; |
|
|
|
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_dat_snoop_incoming_dhcp_ack(bat_priv, skb, hdr_size); |
|
|
|
/* 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); |
|
free_skb: |
|
kfree_skb(skb); |
|
ret = NET_RX_DROP; |
|
out: |
|
batadv_orig_node_put(orig_node); |
|
return ret; |
|
}
|
|
|