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net/batman-adv/routing.c
31.3 KB
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/* Copyright (C) 2007-2014 B.A.T.M.A.N. contributors: |
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* * Marek Lindner, Simon Wunderlich * * This program is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public * License as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License |
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* along with this program; if not, see <http://www.gnu.org/licenses/>. |
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*/ #include "main.h" #include "routing.h" #include "send.h" |
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#include "soft-interface.h" #include "hard-interface.h" #include "icmp_socket.h" #include "translation-table.h" #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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/** * _batadv_update_route - set the router for this originator * @bat_priv: the bat priv with all the soft interface information * @orig_node: orig node which is to be configured * @recv_if: the receive interface for which this route is set * @neigh_node: neighbor which should be the next router * * This function does not perform any error checks */ |
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static void _batadv_update_route(struct batadv_priv *bat_priv, 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); if (!orig_ifinfo) return; rcu_read_lock(); curr_router = rcu_dereference(orig_ifinfo->router); if (curr_router && !atomic_inc_not_zero(&curr_router->refcount)) curr_router = NULL; rcu_read_unlock(); |
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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, "Deleting route towards: %pM ", 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 */ } 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) ", 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) ", orig_node->orig, neigh_node->addr, 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)) neigh_node = NULL; |
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spin_lock_bh(&orig_node->neigh_list_lock); |
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rcu_assign_pointer(orig_ifinfo->router, neigh_node); |
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spin_unlock_bh(&orig_node->neigh_list_lock); |
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batadv_orig_ifinfo_free_ref(orig_ifinfo); |
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/* decrease refcount of previous best neighbor */ if (curr_router) |
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batadv_neigh_node_free_ref(curr_router); |
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} |
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/** * batadv_update_route - set the router for this originator * @bat_priv: the bat priv with all the soft interface information * @orig_node: orig node which is to be configured * @recv_if: the receive interface for which this route is set * @neigh_node: neighbor which should be the next router */ |
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void batadv_update_route(struct batadv_priv *bat_priv, struct batadv_orig_node *orig_node, |
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struct batadv_hard_iface *recv_if, |
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struct batadv_neigh_node *neigh_node) |
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{ |
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struct batadv_neigh_node *router = NULL; |
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if (!orig_node) |
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goto out; |
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router = batadv_orig_router_get(orig_node, recv_if); |
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|
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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: if (router) |
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batadv_neigh_node_free_ref(router); |
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} |
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/* checks whether the host restarted and is in the protection time. * returns: * 0 if the packet is to be accepted * 1 if the packet is to be ignored. */ |
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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 || seq_num_diff >= BATADV_EXPECTED_SEQNO_RANGE) { if (!batadv_has_timed_out(*last_reset, 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 "); |
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} |
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return 0; } |
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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; /* drop packet if it has not necessary minimum size */ |
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if (unlikely(!pskb_may_pull(skb, header_len))) return false; |
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ethhdr = eth_hdr(skb); |
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/* packet with broadcast indication but unicast recipient */ if (!is_broadcast_ether_addr(ethhdr->h_dest)) |
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return false; |
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/* packet with broadcast sender address */ 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. */ if (skb_cow(skb, 0) < 0) |
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return false; |
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/* keep skb linear */ 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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/** * batadv_recv_my_icmp_packet - receive an icmp packet locally * @bat_priv: the bat priv with all the soft interface information * @skb: icmp packet to process * * Returns NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP * otherwise. */ |
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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; struct batadv_orig_node *orig_node = NULL; |
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struct batadv_icmp_header *icmph; 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) { case BATADV_ECHO_REPLY: case BATADV_DESTINATION_UNREACHABLE: case BATADV_TTL_EXCEEDED: /* receive the packet */ if (skb_linearize(skb) < 0) break; |
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batadv_socket_receive_packet(icmph, skb->len); break; case BATADV_ECHO_REQUEST: /* answer echo request (ping) */ primary_if = batadv_primary_if_get_selected(bat_priv); if (!primary_if) goto out; /* get routing information */ orig_node = batadv_orig_hash_find(bat_priv, icmph->orig); 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; icmph = (struct batadv_icmp_header *)skb->data; |
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ether_addr_copy(icmph->dst, icmph->orig); 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); if (res != NET_XMIT_DROP) ret = NET_RX_SUCCESS; break; default: /* 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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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; 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 ", |
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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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|
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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); ether_addr_copy(icmp_packet->orig, primary_if->net_dev->dev_addr); |
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icmp_packet->msg_type = BATADV_TTL_EXCEEDED; 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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int batadv_recv_icmp_packet(struct sk_buff *skb, 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; 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 */ if (unlikely(!pskb_may_pull(skb, hdr_size))) |
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goto out; |
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|
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ethhdr = eth_hdr(skb); |
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/* packet with unicast indication but broadcast recipient */ if (is_broadcast_ether_addr(ethhdr->h_dest)) |
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goto out; |
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/* packet with broadcast sender address */ 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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|
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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 || icmph->msg_type == BATADV_ECHO_REQUEST) && (skb->len >= sizeof(struct batadv_icmp_packet_rr))) { if (skb_linearize(skb) < 0) goto out; /* create a copy of the skb, if needed, to modify it. */ if (skb_cow(skb, ETH_HLEN) < 0) goto out; icmph = (struct batadv_icmp_header *)skb->data; icmp_packet_rr = (struct batadv_icmp_packet_rr *)icmph; if (icmp_packet_rr->rr_cur >= BATADV_RR_LEN) goto out; |
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ether_addr_copy(icmp_packet_rr->rr[icmp_packet_rr->rr_cur], ethhdr->h_dest); |
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icmp_packet_rr->rr_cur++; |
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} /* packet for me */ |
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if (batadv_is_my_mac(bat_priv, icmph->dst)) return batadv_recv_my_icmp_packet(bat_priv, skb); |
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/* TTL exceeded */ |
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if (icmph->ttl < 2) |
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return batadv_recv_icmp_ttl_exceeded(bat_priv, skb); |
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/* get routing information */ |
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orig_node = batadv_orig_hash_find(bat_priv, icmph->dst); |
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if (!orig_node) |
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goto out; |
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|
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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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|
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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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/* 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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/** * 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 * @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. */ |
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static int batadv_check_unicast_packet(struct batadv_priv *bat_priv, struct sk_buff *skb, int hdr_size) |
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{ struct ethhdr *ethhdr; /* drop packet if it has not necessary minimum size */ if (unlikely(!pskb_may_pull(skb, hdr_size))) |
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return -ENODATA; |
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|
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ethhdr = eth_hdr(skb); |
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/* packet with unicast indication but broadcast recipient */ if (is_broadcast_ether_addr(ethhdr->h_dest)) |
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return -EBADR; |
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/* packet with broadcast sender address */ if (is_broadcast_ether_addr(ethhdr->h_source)) |
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return -EBADR; |
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/* 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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/** * batadv_find_router - find a suitable router for this originator * @bat_priv: the bat priv with all the soft interface information * @orig_node: the destination node * @recv_if: pointer to interface this packet was received on * * Returns the router which should be used for this orig_node on * this interface, or NULL if not available. |
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*/ |
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|
416 417 418 |
struct batadv_neigh_node * batadv_find_router(struct batadv_priv *bat_priv, struct batadv_orig_node *orig_node, |
f3b3d9018
|
419 |
struct batadv_hard_iface *recv_if) |
c6c8fea29
|
420 |
{ |
f3b3d9018
|
421 422 423 424 425 426 427 428 429 |
struct batadv_algo_ops *bao = bat_priv->bat_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; |
c6c8fea29
|
430 431 432 |
if (!orig_node) return NULL; |
7351a4822
|
433 |
router = batadv_orig_router_get(orig_node, recv_if); |
c6c8fea29
|
434 |
|
f3b3d9018
|
435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 |
/* 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) || !router) 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 choosen * router - obviously there are no other candidates. */ rcu_read_lock(); last_candidate = orig_node->last_bonding_candidate; if (last_candidate) last_cand_router = rcu_dereference(last_candidate->router); hlist_for_each_entry_rcu(cand, &orig_node->ifinfo_list, list) { /* acquire some structures and references ... */ if (!atomic_inc_not_zero(&cand->refcount)) continue; cand_router = rcu_dereference(cand->router); if (!cand_router) goto next; if (!atomic_inc_not_zero(&cand_router->refcount)) { cand_router = NULL; goto next; } /* alternative candidate should be good enough to be * considered */ if (!bao->bat_neigh_is_equiv_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) { atomic_inc(&cand_router->refcount); atomic_inc(&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_free_ref(cand_router); cand_router = NULL; } batadv_orig_ifinfo_free_ref(cand); } rcu_read_unlock(); /* last_bonding_candidate is reset below, remove the old reference. */ if (orig_node->last_bonding_candidate) batadv_orig_ifinfo_free_ref(orig_node->last_bonding_candidate); /* 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_free_ref(router); /* remove references to first candidate, we don't need it. */ if (first_candidate) { batadv_neigh_node_free_ref(first_candidate_router); batadv_orig_ifinfo_free_ref(first_candidate); } router = next_candidate_router; orig_node->last_bonding_candidate = next_candidate; } else if (first_candidate) { batadv_neigh_node_free_ref(router); /* refcounting has already been done in the loop above. */ router = first_candidate_router; orig_node->last_bonding_candidate = first_candidate; } else { orig_node->last_bonding_candidate = NULL; } |
f6c8b7117
|
539 |
|
c6c8fea29
|
540 541 |
return router; } |
63b010371
|
542 |
static int batadv_route_unicast_packet(struct sk_buff *skb, |
56303d34a
|
543 |
struct batadv_hard_iface *recv_if) |
c6c8fea29
|
544 |
{ |
56303d34a
|
545 546 |
struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); struct batadv_orig_node *orig_node = NULL; |
964126901
|
547 |
struct batadv_unicast_packet *unicast_packet; |
7ed4be952
|
548 |
struct ethhdr *ethhdr = eth_hdr(skb); |
c54f38c9a
|
549 |
int res, hdr_len, ret = NET_RX_DROP; |
c6c8fea29
|
550 |
|
964126901
|
551 |
unicast_packet = (struct batadv_unicast_packet *)skb->data; |
c6c8fea29
|
552 553 |
/* TTL exceeded */ |
a40d9b075
|
554 |
if (unicast_packet->ttl < 2) { |
86ceb3605
|
555 556 557 |
pr_debug("Warning - can't forward unicast packet from %pM to %pM: ttl exceeded ", ethhdr->h_source, unicast_packet->dest); |
44524fcdf
|
558 |
goto out; |
c6c8fea29
|
559 560 561 |
} /* get routing information */ |
da641193d
|
562 |
orig_node = batadv_orig_hash_find(bat_priv, unicast_packet->dest); |
7aadf889e
|
563 |
|
44524fcdf
|
564 |
if (!orig_node) |
b5a6f69c5
|
565 |
goto out; |
c6c8fea29
|
566 |
|
c6c8fea29
|
567 |
/* create a copy of the skb, if needed, to modify it. */ |
0d125074e
|
568 |
if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcdf
|
569 |
goto out; |
c6c8fea29
|
570 |
|
c6c8fea29
|
571 |
/* decrement ttl */ |
f097e25db
|
572 |
unicast_packet = (struct batadv_unicast_packet *)skb->data; |
a40d9b075
|
573 |
unicast_packet->ttl--; |
c6c8fea29
|
574 |
|
a40d9b075
|
575 |
switch (unicast_packet->packet_type) { |
c54f38c9a
|
576 577 578 579 580 581 582 583 584 585 586 587 588 589 |
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); |
e91ecfc64
|
590 |
res = batadv_send_skb_to_orig(skb, orig_node, recv_if); |
953324776
|
591 |
|
e91ecfc64
|
592 593 594 |
/* translate transmit result into receive result */ if (res == NET_XMIT_SUCCESS) { /* skb was transmitted and consumed */ |
953324776
|
595 596 597 |
batadv_inc_counter(bat_priv, BATADV_CNT_FORWARD); batadv_add_counter(bat_priv, BATADV_CNT_FORWARD_BYTES, skb->len + ETH_HLEN); |
e91ecfc64
|
598 599 600 601 602 |
ret = NET_RX_SUCCESS; } else if (res == NET_XMIT_POLICED) { /* skb was buffered and consumed */ ret = NET_RX_SUCCESS; |
953324776
|
603 |
} |
c6c8fea29
|
604 |
|
44524fcdf
|
605 |
out: |
44524fcdf
|
606 |
if (orig_node) |
7d211efc5
|
607 |
batadv_orig_node_free_ref(orig_node); |
44524fcdf
|
608 |
return ret; |
c6c8fea29
|
609 |
} |
7c1fd91da
|
610 611 612 613 614 |
/** * 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 |
c018ad3de
|
615 |
* @vid: VLAN identifier |
7c1fd91da
|
616 617 618 619 620 621 622 623 624 625 |
* * 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, |
c018ad3de
|
626 |
uint8_t *dst_addr, unsigned short vid) |
7c1fd91da
|
627 628 629 630 631 |
{ struct batadv_orig_node *orig_node = NULL; struct batadv_hard_iface *primary_if = NULL; bool ret = false; uint8_t *orig_addr, orig_ttvn; |
c018ad3de
|
632 |
if (batadv_is_my_client(bat_priv, dst_addr, vid)) { |
7c1fd91da
|
633 634 635 636 637 638 |
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 { |
c018ad3de
|
639 640 |
orig_node = batadv_transtable_search(bat_priv, NULL, dst_addr, vid); |
7c1fd91da
|
641 642 643 644 645 646 647 648 649 650 651 |
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 */ |
8fdd01530
|
652 |
ether_addr_copy(unicast_packet->dest, orig_addr); |
7c1fd91da
|
653 654 655 656 657 658 659 660 661 662 663 |
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; } |
56303d34a
|
664 |
static int batadv_check_unicast_ttvn(struct batadv_priv *bat_priv, |
dd981ab09
|
665 |
struct sk_buff *skb, int hdr_len) { |
c018ad3de
|
666 667 |
struct batadv_unicast_packet *unicast_packet; struct batadv_hard_iface *primary_if; |
56303d34a
|
668 |
struct batadv_orig_node *orig_node; |
c018ad3de
|
669 |
uint8_t curr_ttvn, old_ttvn; |
a73105b8d
|
670 |
struct ethhdr *ethhdr; |
c018ad3de
|
671 |
unsigned short vid; |
3e34819e0
|
672 |
int is_old_ttvn; |
a73105b8d
|
673 |
|
b8fcfa42e
|
674 |
/* check if there is enough data before accessing it */ |
f1791425c
|
675 |
if (!pskb_may_pull(skb, hdr_len + ETH_HLEN)) |
b8fcfa42e
|
676 677 678 679 |
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) |
a73105b8d
|
680 |
return 0; |
964126901
|
681 |
unicast_packet = (struct batadv_unicast_packet *)skb->data; |
c018ad3de
|
682 |
vid = batadv_get_vid(skb, hdr_len); |
dd981ab09
|
683 |
ethhdr = (struct ethhdr *)(skb->data + hdr_len); |
a73105b8d
|
684 |
|
7c1fd91da
|
685 686 687 688 689 |
/* 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 */ |
c018ad3de
|
690 |
if (batadv_tt_local_client_is_roaming(bat_priv, ethhdr->h_dest, vid)) { |
7c1fd91da
|
691 |
if (batadv_reroute_unicast_packet(bat_priv, unicast_packet, |
c018ad3de
|
692 |
ethhdr->h_dest, vid)) |
7c1fd91da
|
693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 |
net_ratelimited_function(batadv_dbg, BATADV_DBG_TT, bat_priv, "Rerouting unicast packet to %pM (dst=%pM): Local Roaming ", 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); |
fe8a93b95
|
712 |
if (!batadv_is_my_mac(bat_priv, unicast_packet->dest)) { |
da641193d
|
713 714 |
orig_node = batadv_orig_hash_find(bat_priv, unicast_packet->dest); |
7c1fd91da
|
715 716 717 718 |
/* 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 */ |
a73105b8d
|
719 720 721 722 |
if (!orig_node) return 0; curr_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn); |
7d211efc5
|
723 |
batadv_orig_node_free_ref(orig_node); |
a73105b8d
|
724 |
} |
7c1fd91da
|
725 726 727 |
/* check if the TTVN contained in the packet is fresher than what the * node knows */ |
3e34819e0
|
728 |
is_old_ttvn = batadv_seq_before(unicast_packet->ttvn, curr_ttvn); |
7c1fd91da
|
729 730 |
if (!is_old_ttvn) return 1; |
a73105b8d
|
731 |
|
7c1fd91da
|
732 733 734 735 736 737 |
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, |
c018ad3de
|
738 |
ethhdr->h_dest, vid)) { |
7c1fd91da
|
739 740 741 742 743 744 745 |
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 ", unicast_packet->dest, ethhdr->h_dest, old_ttvn, curr_ttvn); return 1; } |
3275e7cc8
|
746 |
|
7c1fd91da
|
747 748 749 750 |
/* 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 */ |
c018ad3de
|
751 |
if (!batadv_is_my_client(bat_priv, ethhdr->h_dest, vid)) |
7c1fd91da
|
752 |
return 0; |
3275e7cc8
|
753 |
|
7c1fd91da
|
754 755 756 757 758 759 |
/* 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; |
a73105b8d
|
760 |
|
8fdd01530
|
761 |
ether_addr_copy(unicast_packet->dest, primary_if->net_dev->dev_addr); |
7c1fd91da
|
762 763 764 765 |
batadv_hardif_free_ref(primary_if); unicast_packet->ttvn = curr_ttvn; |
a73105b8d
|
766 |
|
a73105b8d
|
767 768 |
return 1; } |
a1f1ac5c4
|
769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 |
/** * 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); } |
56303d34a
|
796 797 |
int batadv_recv_unicast_packet(struct sk_buff *skb, struct batadv_hard_iface *recv_if) |
c6c8fea29
|
798 |
{ |
56303d34a
|
799 |
struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
964126901
|
800 |
struct batadv_unicast_packet *unicast_packet; |
4046b24af
|
801 |
struct batadv_unicast_4addr_packet *unicast_4addr_packet; |
9affec6be
|
802 803 |
uint8_t *orig_addr; struct batadv_orig_node *orig_node = NULL; |
612d2b4fe
|
804 |
int check, hdr_size = sizeof(*unicast_packet); |
c384ea3ec
|
805 |
bool is4addr; |
c6c8fea29
|
806 |
|
7cdcf6ddd
|
807 |
unicast_packet = (struct batadv_unicast_packet *)skb->data; |
4046b24af
|
808 |
unicast_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data; |
7cdcf6ddd
|
809 |
|
a40d9b075
|
810 |
is4addr = unicast_packet->packet_type == BATADV_UNICAST_4ADDR; |
7cdcf6ddd
|
811 |
/* the caller function should have already pulled 2 bytes */ |
c384ea3ec
|
812 |
if (is4addr) |
4046b24af
|
813 |
hdr_size = sizeof(*unicast_4addr_packet); |
7cdcf6ddd
|
814 |
|
612d2b4fe
|
815 |
/* function returns -EREMOTE for promiscuous packets */ |
6e0895c2e
|
816 |
check = batadv_check_unicast_packet(bat_priv, skb, hdr_size); |
612d2b4fe
|
817 818 819 820 821 822 823 824 |
/* 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) |
c6c8fea29
|
825 |
return NET_RX_DROP; |
dd981ab09
|
826 |
if (!batadv_check_unicast_ttvn(bat_priv, skb, hdr_size)) |
a73105b8d
|
827 |
return NET_RX_DROP; |
c6c8fea29
|
828 |
/* packet for me */ |
fe8a93b95
|
829 |
if (batadv_is_my_mac(bat_priv, unicast_packet->dest)) { |
9affec6be
|
830 |
if (is4addr) { |
4046b24af
|
831 832 |
batadv_dat_inc_counter(bat_priv, unicast_4addr_packet->subtype); |
9affec6be
|
833 834 835 |
orig_addr = unicast_4addr_packet->src; orig_node = batadv_orig_hash_find(bat_priv, orig_addr); } |
4046b24af
|
836 |
|
c384ea3ec
|
837 838 839 840 841 842 |
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; |
371351731
|
843 |
batadv_interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size, |
9affec6be
|
844 |
orig_node); |
371351731
|
845 |
|
c384ea3ec
|
846 |
rx_success: |
9affec6be
|
847 848 |
if (orig_node) batadv_orig_node_free_ref(orig_node); |
c6c8fea29
|
849 850 |
return NET_RX_SUCCESS; } |
63b010371
|
851 |
return batadv_route_unicast_packet(skb, recv_if); |
c6c8fea29
|
852 |
} |
ef2615774
|
853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 |
/** * 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); |
05c3c8a63
|
898 899 |
else consume_skb(skb); |
ef2615774
|
900 901 902 |
return ret; } |
c6c8fea29
|
903 |
|
610bfc6bc
|
904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 |
/** * 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; } |
56303d34a
|
961 962 |
int batadv_recv_bcast_packet(struct sk_buff *skb, struct batadv_hard_iface *recv_if) |
c6c8fea29
|
963 |
{ |
56303d34a
|
964 965 |
struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); struct batadv_orig_node *orig_node = NULL; |
964126901
|
966 |
struct batadv_bcast_packet *bcast_packet; |
c6c8fea29
|
967 |
struct ethhdr *ethhdr; |
704509b8d
|
968 |
int hdr_size = sizeof(*bcast_packet); |
f3e0008f0
|
969 |
int ret = NET_RX_DROP; |
c6c8fea29
|
970 |
int32_t seq_diff; |
3fba7325b
|
971 |
uint32_t seqno; |
c6c8fea29
|
972 973 974 |
/* drop packet if it has not necessary minimum size */ if (unlikely(!pskb_may_pull(skb, hdr_size))) |
f3e0008f0
|
975 |
goto out; |
c6c8fea29
|
976 |
|
7ed4be952
|
977 |
ethhdr = eth_hdr(skb); |
c6c8fea29
|
978 979 980 |
/* packet with broadcast indication but unicast recipient */ if (!is_broadcast_ether_addr(ethhdr->h_dest)) |
f3e0008f0
|
981 |
goto out; |
c6c8fea29
|
982 983 984 |
/* packet with broadcast sender address */ if (is_broadcast_ether_addr(ethhdr->h_source)) |
f3e0008f0
|
985 |
goto out; |
c6c8fea29
|
986 987 |
/* ignore broadcasts sent by myself */ |
fe8a93b95
|
988 |
if (batadv_is_my_mac(bat_priv, ethhdr->h_source)) |
f3e0008f0
|
989 |
goto out; |
c6c8fea29
|
990 |
|
964126901
|
991 |
bcast_packet = (struct batadv_bcast_packet *)skb->data; |
c6c8fea29
|
992 993 |
/* ignore broadcasts originated by myself */ |
fe8a93b95
|
994 |
if (batadv_is_my_mac(bat_priv, bcast_packet->orig)) |
f3e0008f0
|
995 |
goto out; |
c6c8fea29
|
996 |
|
a40d9b075
|
997 |
if (bcast_packet->ttl < 2) |
f3e0008f0
|
998 |
goto out; |
c6c8fea29
|
999 |
|
da641193d
|
1000 |
orig_node = batadv_orig_hash_find(bat_priv, bcast_packet->orig); |
f3e0008f0
|
1001 1002 |
if (!orig_node) |
b5a6f69c5
|
1003 |
goto out; |
c6c8fea29
|
1004 |
|
f3e0008f0
|
1005 |
spin_lock_bh(&orig_node->bcast_seqno_lock); |
c6c8fea29
|
1006 |
|
3fba7325b
|
1007 |
seqno = ntohl(bcast_packet->seqno); |
c6c8fea29
|
1008 |
/* check whether the packet is a duplicate */ |
9b4a1159d
|
1009 |
if (batadv_test_bit(orig_node->bcast_bits, orig_node->last_bcast_seqno, |
3fba7325b
|
1010 |
seqno)) |
f3e0008f0
|
1011 |
goto spin_unlock; |
c6c8fea29
|
1012 |
|
3fba7325b
|
1013 |
seq_diff = seqno - orig_node->last_bcast_seqno; |
c6c8fea29
|
1014 1015 |
/* check whether the packet is old and the host just restarted. */ |
30d3c5113
|
1016 1017 |
if (batadv_window_protected(bat_priv, seq_diff, &orig_node->bcast_seqno_reset)) |
f3e0008f0
|
1018 |
goto spin_unlock; |
c6c8fea29
|
1019 1020 |
/* mark broadcast in flood history, update window position |
9cfc7bd60
|
1021 1022 |
* if required. */ |
0f5f93226
|
1023 |
if (batadv_bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1)) |
3fba7325b
|
1024 |
orig_node->last_bcast_seqno = seqno; |
c6c8fea29
|
1025 |
|
f3e0008f0
|
1026 |
spin_unlock_bh(&orig_node->bcast_seqno_lock); |
f3e0008f0
|
1027 |
|
fe2da6ff2
|
1028 |
/* check whether this has been sent by another originator before */ |
004e86fc5
|
1029 |
if (batadv_bla_check_bcast_duplist(bat_priv, skb)) |
fe2da6ff2
|
1030 |
goto out; |
c54f38c9a
|
1031 |
batadv_skb_set_priority(skb, sizeof(struct batadv_bcast_packet)); |
c6c8fea29
|
1032 |
/* rebroadcast packet */ |
9455e34cb
|
1033 |
batadv_add_bcast_packet_to_list(bat_priv, skb, 1); |
c6c8fea29
|
1034 |
|
23721387c
|
1035 1036 1037 |
/* don't hand the broadcast up if it is from an originator * from the same backbone. */ |
08adf1512
|
1038 |
if (batadv_bla_is_backbone_gw(skb, orig_node, hdr_size)) |
23721387c
|
1039 |
goto out; |
c384ea3ec
|
1040 1041 1042 1043 |
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; |
c6c8fea29
|
1044 |
/* broadcast for me */ |
371351731
|
1045 1046 |
batadv_interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size, orig_node); |
c384ea3ec
|
1047 1048 |
rx_success: |
f3e0008f0
|
1049 1050 |
ret = NET_RX_SUCCESS; goto out; |
c6c8fea29
|
1051 |
|
f3e0008f0
|
1052 1053 |
spin_unlock: spin_unlock_bh(&orig_node->bcast_seqno_lock); |
f3e0008f0
|
1054 1055 |
out: if (orig_node) |
7d211efc5
|
1056 |
batadv_orig_node_free_ref(orig_node); |
f3e0008f0
|
1057 |
return ret; |
c6c8fea29
|
1058 |
} |