![Antonio Quartulli](/assets/img/avatar_default.png)
batadv_send_skb_prepare_unicast(_4addr) might reallocate the skb's data. If it does then our ethhdr pointer is not valid anymore in batadv_send_skb_unicast(), resulting in a kernel paging error. Fixing this by refetching the ethhdr pointer after the potential reallocation. Signed-off-by: Linus Lüssing <linus.luessing@web.de> Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
645 lines
20 KiB
C
645 lines
20 KiB
C
/* Copyright (C) 2007-2014 B.A.T.M.A.N. contributors:
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*
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* Marek Lindner, Simon Wunderlich
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "main.h"
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#include "distributed-arp-table.h"
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#include "send.h"
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#include "routing.h"
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#include "translation-table.h"
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#include "soft-interface.h"
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#include "hard-interface.h"
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#include "gateway_common.h"
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#include "gateway_client.h"
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#include "originator.h"
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#include "network-coding.h"
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#include "fragmentation.h"
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static void batadv_send_outstanding_bcast_packet(struct work_struct *work);
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/* send out an already prepared packet to the given address via the
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* specified batman interface
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*/
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int batadv_send_skb_packet(struct sk_buff *skb,
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struct batadv_hard_iface *hard_iface,
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const uint8_t *dst_addr)
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{
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struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
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struct ethhdr *ethhdr;
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if (hard_iface->if_status != BATADV_IF_ACTIVE)
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goto send_skb_err;
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if (unlikely(!hard_iface->net_dev))
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goto send_skb_err;
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if (!(hard_iface->net_dev->flags & IFF_UP)) {
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pr_warn("Interface %s is not up - can't send packet via that interface!\n",
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hard_iface->net_dev->name);
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goto send_skb_err;
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}
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/* push to the ethernet header. */
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if (batadv_skb_head_push(skb, ETH_HLEN) < 0)
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goto send_skb_err;
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skb_reset_mac_header(skb);
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ethhdr = eth_hdr(skb);
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memcpy(ethhdr->h_source, hard_iface->net_dev->dev_addr, ETH_ALEN);
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memcpy(ethhdr->h_dest, dst_addr, ETH_ALEN);
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ethhdr->h_proto = htons(ETH_P_BATMAN);
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skb_set_network_header(skb, ETH_HLEN);
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skb->protocol = htons(ETH_P_BATMAN);
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skb->dev = hard_iface->net_dev;
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/* Save a clone of the skb to use when decoding coded packets */
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batadv_nc_skb_store_for_decoding(bat_priv, skb);
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/* dev_queue_xmit() returns a negative result on error. However on
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* congestion and traffic shaping, it drops and returns NET_XMIT_DROP
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* (which is > 0). This will not be treated as an error.
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*/
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return dev_queue_xmit(skb);
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send_skb_err:
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kfree_skb(skb);
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return NET_XMIT_DROP;
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}
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/**
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* batadv_send_skb_to_orig - Lookup next-hop and transmit skb.
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* @skb: Packet to be transmitted.
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* @orig_node: Final destination of the packet.
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* @recv_if: Interface used when receiving the packet (can be NULL).
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*
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* Looks up the best next-hop towards the passed originator and passes the
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* skb on for preparation of MAC header. If the packet originated from this
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* host, NULL can be passed as recv_if and no interface alternating is
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* attempted.
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*
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* Returns NET_XMIT_SUCCESS on success, NET_XMIT_DROP on failure, or
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* NET_XMIT_POLICED if the skb is buffered for later transmit.
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*/
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int batadv_send_skb_to_orig(struct sk_buff *skb,
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struct batadv_orig_node *orig_node,
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struct batadv_hard_iface *recv_if)
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{
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struct batadv_priv *bat_priv = orig_node->bat_priv;
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struct batadv_neigh_node *neigh_node;
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int ret = NET_XMIT_DROP;
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/* batadv_find_router() increases neigh_nodes refcount if found. */
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neigh_node = batadv_find_router(bat_priv, orig_node, recv_if);
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if (!neigh_node)
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goto out;
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/* Check if the skb is too large to send in one piece and fragment
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* it if needed.
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*/
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if (atomic_read(&bat_priv->fragmentation) &&
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skb->len > neigh_node->if_incoming->net_dev->mtu) {
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/* Fragment and send packet. */
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if (batadv_frag_send_packet(skb, orig_node, neigh_node))
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ret = NET_XMIT_SUCCESS;
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goto out;
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}
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/* try to network code the packet, if it is received on an interface
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* (i.e. being forwarded). If the packet originates from this node or if
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* network coding fails, then send the packet as usual.
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*/
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if (recv_if && batadv_nc_skb_forward(skb, neigh_node)) {
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ret = NET_XMIT_POLICED;
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} else {
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batadv_send_skb_packet(skb, neigh_node->if_incoming,
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neigh_node->addr);
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ret = NET_XMIT_SUCCESS;
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}
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out:
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if (neigh_node)
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batadv_neigh_node_free_ref(neigh_node);
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return ret;
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}
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/**
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* batadv_send_skb_push_fill_unicast - extend the buffer and initialize the
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* common fields for unicast packets
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* @skb: the skb carrying the unicast header to initialize
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* @hdr_size: amount of bytes to push at the beginning of the skb
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* @orig_node: the destination node
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*
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* Returns false if the buffer extension was not possible or true otherwise.
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*/
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static bool
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batadv_send_skb_push_fill_unicast(struct sk_buff *skb, int hdr_size,
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struct batadv_orig_node *orig_node)
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{
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struct batadv_unicast_packet *unicast_packet;
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uint8_t ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn);
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if (batadv_skb_head_push(skb, hdr_size) < 0)
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return false;
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unicast_packet = (struct batadv_unicast_packet *)skb->data;
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unicast_packet->version = BATADV_COMPAT_VERSION;
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/* batman packet type: unicast */
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unicast_packet->packet_type = BATADV_UNICAST;
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/* set unicast ttl */
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unicast_packet->ttl = BATADV_TTL;
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/* copy the destination for faster routing */
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memcpy(unicast_packet->dest, orig_node->orig, ETH_ALEN);
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/* set the destination tt version number */
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unicast_packet->ttvn = ttvn;
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return true;
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}
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/**
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* batadv_send_skb_prepare_unicast - encapsulate an skb with a unicast header
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* @skb: the skb containing the payload to encapsulate
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* @orig_node: the destination node
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*
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* Returns false if the payload could not be encapsulated or true otherwise.
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*/
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static bool batadv_send_skb_prepare_unicast(struct sk_buff *skb,
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struct batadv_orig_node *orig_node)
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{
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size_t uni_size = sizeof(struct batadv_unicast_packet);
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return batadv_send_skb_push_fill_unicast(skb, uni_size, orig_node);
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}
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/**
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* batadv_send_skb_prepare_unicast_4addr - encapsulate an skb with a
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* unicast 4addr header
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* @bat_priv: the bat priv with all the soft interface information
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* @skb: the skb containing the payload to encapsulate
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* @orig_node: the destination node
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* @packet_subtype: the unicast 4addr packet subtype to use
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*
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* Returns false if the payload could not be encapsulated or true otherwise.
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*/
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bool batadv_send_skb_prepare_unicast_4addr(struct batadv_priv *bat_priv,
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struct sk_buff *skb,
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struct batadv_orig_node *orig,
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int packet_subtype)
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{
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struct batadv_hard_iface *primary_if;
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struct batadv_unicast_4addr_packet *uc_4addr_packet;
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bool ret = false;
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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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/* Pull the header space and fill the unicast_packet substructure.
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* We can do that because the first member of the uc_4addr_packet
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* is of type struct unicast_packet
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*/
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if (!batadv_send_skb_push_fill_unicast(skb, sizeof(*uc_4addr_packet),
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orig))
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goto out;
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uc_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data;
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uc_4addr_packet->u.packet_type = BATADV_UNICAST_4ADDR;
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memcpy(uc_4addr_packet->src, primary_if->net_dev->dev_addr, ETH_ALEN);
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uc_4addr_packet->subtype = packet_subtype;
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uc_4addr_packet->reserved = 0;
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ret = true;
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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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return ret;
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}
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/**
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* batadv_send_skb_unicast - encapsulate and send an skb via unicast
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* @bat_priv: the bat priv with all the soft interface information
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* @skb: payload to send
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* @packet_type: the batman unicast packet type to use
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* @packet_subtype: the unicast 4addr packet subtype (only relevant for unicast
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* 4addr packets)
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* @orig_node: the originator to send the packet to
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* @vid: the vid to be used to search the translation table
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*
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* Wrap the given skb into a batman-adv unicast or unicast-4addr header
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* depending on whether BATADV_UNICAST or BATADV_UNICAST_4ADDR was supplied
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* as packet_type. Then send this frame to the given orig_node and release a
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* reference to this orig_node.
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*
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* Returns NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise.
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*/
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static int batadv_send_skb_unicast(struct batadv_priv *bat_priv,
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struct sk_buff *skb, int packet_type,
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int packet_subtype,
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struct batadv_orig_node *orig_node,
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unsigned short vid)
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{
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struct ethhdr *ethhdr;
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struct batadv_unicast_packet *unicast_packet;
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int ret = NET_XMIT_DROP, hdr_size;
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if (!orig_node)
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goto out;
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switch (packet_type) {
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case BATADV_UNICAST:
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if (!batadv_send_skb_prepare_unicast(skb, orig_node))
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goto out;
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hdr_size = sizeof(*unicast_packet);
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break;
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case BATADV_UNICAST_4ADDR:
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if (!batadv_send_skb_prepare_unicast_4addr(bat_priv, skb,
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orig_node,
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packet_subtype))
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goto out;
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hdr_size = sizeof(struct batadv_unicast_4addr_packet);
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break;
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default:
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/* this function supports UNICAST and UNICAST_4ADDR only. It
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* should never be invoked with any other packet type
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*/
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goto out;
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}
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ethhdr = (struct ethhdr *)(skb->data + hdr_size);
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unicast_packet = (struct batadv_unicast_packet *)skb->data;
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/* inform the destination node that we are still missing a correct route
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* for this client. The destination will receive this packet and will
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* try to reroute it because the ttvn contained in the header is less
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* than the current one
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*/
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if (batadv_tt_global_client_is_roaming(bat_priv, ethhdr->h_dest, vid))
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unicast_packet->ttvn = unicast_packet->ttvn - 1;
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if (batadv_send_skb_to_orig(skb, orig_node, NULL) != NET_XMIT_DROP)
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ret = NET_XMIT_SUCCESS;
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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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if (ret == NET_XMIT_DROP)
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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_send_skb_via_tt_generic - send an skb via TT lookup
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* @bat_priv: the bat priv with all the soft interface information
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* @skb: payload to send
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* @packet_type: the batman unicast packet type to use
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* @packet_subtype: the unicast 4addr packet subtype (only relevant for unicast
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* 4addr packets)
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* @vid: the vid to be used to search the translation table
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*
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* Look up the recipient node for the destination address in the ethernet
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* header via the translation table. Wrap the given skb into a batman-adv
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* unicast or unicast-4addr header depending on whether BATADV_UNICAST or
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* BATADV_UNICAST_4ADDR was supplied as packet_type. Then send this frame
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* to the according destination node.
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*
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* Returns NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise.
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*/
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int batadv_send_skb_via_tt_generic(struct batadv_priv *bat_priv,
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struct sk_buff *skb, int packet_type,
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int packet_subtype, uint8_t *dst_hint,
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unsigned short vid)
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{
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struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
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struct batadv_orig_node *orig_node;
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uint8_t *src, *dst;
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src = ethhdr->h_source;
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dst = ethhdr->h_dest;
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/* if we got an hint! let's send the packet to this client (if any) */
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if (dst_hint) {
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src = NULL;
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dst = dst_hint;
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}
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orig_node = batadv_transtable_search(bat_priv, src, dst, vid);
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return batadv_send_skb_unicast(bat_priv, skb, packet_type,
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packet_subtype, orig_node, vid);
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}
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/**
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* batadv_send_skb_via_gw - send an skb via gateway lookup
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* @bat_priv: the bat priv with all the soft interface information
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* @skb: payload to send
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* @vid: the vid to be used to search the translation table
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*
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* Look up the currently selected gateway. Wrap the given skb into a batman-adv
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* unicast header and send this frame to this gateway node.
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*
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* Returns NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise.
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*/
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int batadv_send_skb_via_gw(struct batadv_priv *bat_priv, struct sk_buff *skb,
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unsigned short vid)
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{
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struct batadv_orig_node *orig_node;
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orig_node = batadv_gw_get_selected_orig(bat_priv);
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return batadv_send_skb_unicast(bat_priv, skb, BATADV_UNICAST, 0,
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orig_node, vid);
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}
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void batadv_schedule_bat_ogm(struct batadv_hard_iface *hard_iface)
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{
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struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
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if ((hard_iface->if_status == BATADV_IF_NOT_IN_USE) ||
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(hard_iface->if_status == BATADV_IF_TO_BE_REMOVED))
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return;
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/* the interface gets activated here to avoid race conditions between
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* the moment of activating the interface in
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* hardif_activate_interface() where the originator mac is set and
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* outdated packets (especially uninitialized mac addresses) in the
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* packet queue
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*/
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if (hard_iface->if_status == BATADV_IF_TO_BE_ACTIVATED)
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hard_iface->if_status = BATADV_IF_ACTIVE;
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bat_priv->bat_algo_ops->bat_ogm_schedule(hard_iface);
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}
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static void batadv_forw_packet_free(struct batadv_forw_packet *forw_packet)
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{
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if (forw_packet->skb)
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kfree_skb(forw_packet->skb);
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if (forw_packet->if_incoming)
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batadv_hardif_free_ref(forw_packet->if_incoming);
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if (forw_packet->if_outgoing)
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batadv_hardif_free_ref(forw_packet->if_outgoing);
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kfree(forw_packet);
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}
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static void
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_batadv_add_bcast_packet_to_list(struct batadv_priv *bat_priv,
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struct batadv_forw_packet *forw_packet,
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unsigned long send_time)
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{
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/* add new packet to packet list */
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spin_lock_bh(&bat_priv->forw_bcast_list_lock);
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hlist_add_head(&forw_packet->list, &bat_priv->forw_bcast_list);
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spin_unlock_bh(&bat_priv->forw_bcast_list_lock);
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/* start timer for this packet */
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queue_delayed_work(batadv_event_workqueue, &forw_packet->delayed_work,
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send_time);
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}
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/* add a broadcast packet to the queue and setup timers. broadcast packets
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* are sent multiple times to increase probability for being received.
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*
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* This function returns NETDEV_TX_OK on success and NETDEV_TX_BUSY on
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* errors.
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*
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* The skb is not consumed, so the caller should make sure that the
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* skb is freed.
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*/
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int batadv_add_bcast_packet_to_list(struct batadv_priv *bat_priv,
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const struct sk_buff *skb,
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unsigned long delay)
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{
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struct batadv_hard_iface *primary_if = NULL;
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struct batadv_forw_packet *forw_packet;
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struct batadv_bcast_packet *bcast_packet;
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struct sk_buff *newskb;
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if (!batadv_atomic_dec_not_zero(&bat_priv->bcast_queue_left)) {
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batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
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"bcast packet queue full\n");
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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_and_inc;
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forw_packet = kmalloc(sizeof(*forw_packet), GFP_ATOMIC);
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if (!forw_packet)
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goto out_and_inc;
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newskb = skb_copy(skb, GFP_ATOMIC);
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if (!newskb)
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goto packet_free;
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/* as we have a copy now, it is safe to decrease the TTL */
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bcast_packet = (struct batadv_bcast_packet *)newskb->data;
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bcast_packet->ttl--;
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skb_reset_mac_header(newskb);
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forw_packet->skb = newskb;
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forw_packet->if_incoming = primary_if;
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forw_packet->if_outgoing = NULL;
|
|
|
|
/* how often did we send the bcast packet ? */
|
|
forw_packet->num_packets = 0;
|
|
|
|
INIT_DELAYED_WORK(&forw_packet->delayed_work,
|
|
batadv_send_outstanding_bcast_packet);
|
|
|
|
_batadv_add_bcast_packet_to_list(bat_priv, forw_packet, delay);
|
|
return NETDEV_TX_OK;
|
|
|
|
packet_free:
|
|
kfree(forw_packet);
|
|
out_and_inc:
|
|
atomic_inc(&bat_priv->bcast_queue_left);
|
|
out:
|
|
if (primary_if)
|
|
batadv_hardif_free_ref(primary_if);
|
|
return NETDEV_TX_BUSY;
|
|
}
|
|
|
|
static void batadv_send_outstanding_bcast_packet(struct work_struct *work)
|
|
{
|
|
struct batadv_hard_iface *hard_iface;
|
|
struct delayed_work *delayed_work;
|
|
struct batadv_forw_packet *forw_packet;
|
|
struct sk_buff *skb1;
|
|
struct net_device *soft_iface;
|
|
struct batadv_priv *bat_priv;
|
|
|
|
delayed_work = container_of(work, struct delayed_work, work);
|
|
forw_packet = container_of(delayed_work, struct batadv_forw_packet,
|
|
delayed_work);
|
|
soft_iface = forw_packet->if_incoming->soft_iface;
|
|
bat_priv = netdev_priv(soft_iface);
|
|
|
|
spin_lock_bh(&bat_priv->forw_bcast_list_lock);
|
|
hlist_del(&forw_packet->list);
|
|
spin_unlock_bh(&bat_priv->forw_bcast_list_lock);
|
|
|
|
if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING)
|
|
goto out;
|
|
|
|
if (batadv_dat_drop_broadcast_packet(bat_priv, forw_packet))
|
|
goto out;
|
|
|
|
/* rebroadcast packet */
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
|
|
if (hard_iface->soft_iface != soft_iface)
|
|
continue;
|
|
|
|
if (forw_packet->num_packets >= hard_iface->num_bcasts)
|
|
continue;
|
|
|
|
/* send a copy of the saved skb */
|
|
skb1 = skb_clone(forw_packet->skb, GFP_ATOMIC);
|
|
if (skb1)
|
|
batadv_send_skb_packet(skb1, hard_iface,
|
|
batadv_broadcast_addr);
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
forw_packet->num_packets++;
|
|
|
|
/* if we still have some more bcasts to send */
|
|
if (forw_packet->num_packets < BATADV_NUM_BCASTS_MAX) {
|
|
_batadv_add_bcast_packet_to_list(bat_priv, forw_packet,
|
|
msecs_to_jiffies(5));
|
|
return;
|
|
}
|
|
|
|
out:
|
|
batadv_forw_packet_free(forw_packet);
|
|
atomic_inc(&bat_priv->bcast_queue_left);
|
|
}
|
|
|
|
void batadv_send_outstanding_bat_ogm_packet(struct work_struct *work)
|
|
{
|
|
struct delayed_work *delayed_work;
|
|
struct batadv_forw_packet *forw_packet;
|
|
struct batadv_priv *bat_priv;
|
|
|
|
delayed_work = container_of(work, struct delayed_work, work);
|
|
forw_packet = container_of(delayed_work, struct batadv_forw_packet,
|
|
delayed_work);
|
|
bat_priv = netdev_priv(forw_packet->if_incoming->soft_iface);
|
|
spin_lock_bh(&bat_priv->forw_bat_list_lock);
|
|
hlist_del(&forw_packet->list);
|
|
spin_unlock_bh(&bat_priv->forw_bat_list_lock);
|
|
|
|
if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING)
|
|
goto out;
|
|
|
|
bat_priv->bat_algo_ops->bat_ogm_emit(forw_packet);
|
|
|
|
/* we have to have at least one packet in the queue to determine the
|
|
* queues wake up time unless we are shutting down.
|
|
*
|
|
* only re-schedule if this is the "original" copy, e.g. the OGM of the
|
|
* primary interface should only be rescheduled once per period, but
|
|
* this function will be called for the forw_packet instances of the
|
|
* other secondary interfaces as well.
|
|
*/
|
|
if (forw_packet->own &&
|
|
forw_packet->if_incoming == forw_packet->if_outgoing)
|
|
batadv_schedule_bat_ogm(forw_packet->if_incoming);
|
|
|
|
out:
|
|
/* don't count own packet */
|
|
if (!forw_packet->own)
|
|
atomic_inc(&bat_priv->batman_queue_left);
|
|
|
|
batadv_forw_packet_free(forw_packet);
|
|
}
|
|
|
|
void
|
|
batadv_purge_outstanding_packets(struct batadv_priv *bat_priv,
|
|
const struct batadv_hard_iface *hard_iface)
|
|
{
|
|
struct batadv_forw_packet *forw_packet;
|
|
struct hlist_node *safe_tmp_node;
|
|
bool pending;
|
|
|
|
if (hard_iface)
|
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
|
|
"purge_outstanding_packets(): %s\n",
|
|
hard_iface->net_dev->name);
|
|
else
|
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
|
|
"purge_outstanding_packets()\n");
|
|
|
|
/* free bcast list */
|
|
spin_lock_bh(&bat_priv->forw_bcast_list_lock);
|
|
hlist_for_each_entry_safe(forw_packet, safe_tmp_node,
|
|
&bat_priv->forw_bcast_list, list) {
|
|
/* if purge_outstanding_packets() was called with an argument
|
|
* we delete only packets belonging to the given interface
|
|
*/
|
|
if ((hard_iface) &&
|
|
(forw_packet->if_incoming != hard_iface))
|
|
continue;
|
|
|
|
spin_unlock_bh(&bat_priv->forw_bcast_list_lock);
|
|
|
|
/* batadv_send_outstanding_bcast_packet() will lock the list to
|
|
* delete the item from the list
|
|
*/
|
|
pending = cancel_delayed_work_sync(&forw_packet->delayed_work);
|
|
spin_lock_bh(&bat_priv->forw_bcast_list_lock);
|
|
|
|
if (pending) {
|
|
hlist_del(&forw_packet->list);
|
|
batadv_forw_packet_free(forw_packet);
|
|
}
|
|
}
|
|
spin_unlock_bh(&bat_priv->forw_bcast_list_lock);
|
|
|
|
/* free batman packet list */
|
|
spin_lock_bh(&bat_priv->forw_bat_list_lock);
|
|
hlist_for_each_entry_safe(forw_packet, safe_tmp_node,
|
|
&bat_priv->forw_bat_list, list) {
|
|
/* if purge_outstanding_packets() was called with an argument
|
|
* we delete only packets belonging to the given interface
|
|
*/
|
|
if ((hard_iface) &&
|
|
(forw_packet->if_incoming != hard_iface) &&
|
|
(forw_packet->if_outgoing != hard_iface))
|
|
continue;
|
|
|
|
spin_unlock_bh(&bat_priv->forw_bat_list_lock);
|
|
|
|
/* send_outstanding_bat_packet() will lock the list to
|
|
* delete the item from the list
|
|
*/
|
|
pending = cancel_delayed_work_sync(&forw_packet->delayed_work);
|
|
spin_lock_bh(&bat_priv->forw_bat_list_lock);
|
|
|
|
if (pending) {
|
|
hlist_del(&forw_packet->list);
|
|
batadv_forw_packet_free(forw_packet);
|
|
}
|
|
}
|
|
spin_unlock_bh(&bat_priv->forw_bat_list_lock);
|
|
}
|