mirror of https://gitee.com/openkylin/linux.git
1003 lines
30 KiB
C
1003 lines
30 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (C) 2007-2019 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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#include "send.h"
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#include "main.h"
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#include <linux/atomic.h>
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#include <linux/bug.h>
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#include <linux/byteorder/generic.h>
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#include <linux/errno.h>
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#include <linux/etherdevice.h>
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#include <linux/gfp.h>
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#include <linux/if.h>
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#include <linux/if_ether.h>
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#include <linux/jiffies.h>
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#include <linux/kernel.h>
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#include <linux/kref.h>
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#include <linux/list.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/slab.h>
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#include <linux/spinlock.h>
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#include <linux/stddef.h>
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#include <linux/workqueue.h>
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#include "distributed-arp-table.h"
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#include "fragmentation.h"
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#include "gateway_client.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 "routing.h"
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#include "soft-interface.h"
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#include "translation-table.h"
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static void batadv_send_outstanding_bcast_packet(struct work_struct *work);
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/**
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* batadv_send_skb_packet() - send an already prepared packet
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* @skb: the packet to send
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* @hard_iface: the interface to use to send the broadcast packet
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* @dst_addr: the payload destination
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*
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* Send out an already prepared packet to the given neighbor or broadcast it
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* using the specified interface. Either hard_iface or neigh_node must be not
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* NULL.
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* If neigh_node is NULL, then the packet is broadcasted using hard_iface,
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* otherwise it is sent as unicast to the given neighbor.
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*
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* Regardless of the return value, the skb is consumed.
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*
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* Return: A negative errno code is returned on a failure. A success does not
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* guarantee the frame will be transmitted as it may be dropped due
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* to congestion or traffic shaping.
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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 u8 *dst_addr)
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{
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struct batadv_priv *bat_priv;
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struct ethhdr *ethhdr;
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int ret;
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bat_priv = netdev_priv(hard_iface->soft_iface);
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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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ether_addr_copy(ethhdr->h_source, hard_iface->net_dev->dev_addr);
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ether_addr_copy(ethhdr->h_dest, dst_addr);
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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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ret = dev_queue_xmit(skb);
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return net_xmit_eval(ret);
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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_broadcast_skb() - Send broadcast packet via hard interface
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* @skb: packet to be transmitted (with batadv header and no outer eth header)
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* @hard_iface: outgoing interface
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*
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* Return: A negative errno code is returned on a failure. A success does not
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* guarantee the frame will be transmitted as it may be dropped due
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* to congestion or traffic shaping.
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*/
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int batadv_send_broadcast_skb(struct sk_buff *skb,
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struct batadv_hard_iface *hard_iface)
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{
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return batadv_send_skb_packet(skb, hard_iface, batadv_broadcast_addr);
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}
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/**
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* batadv_send_unicast_skb() - Send unicast packet to neighbor
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* @skb: packet to be transmitted (with batadv header and no outer eth header)
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* @neigh: neighbor which is used as next hop to destination
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*
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* Return: A negative errno code is returned on a failure. A success does not
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* guarantee the frame will be transmitted as it may be dropped due
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* to congestion or traffic shaping.
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*/
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int batadv_send_unicast_skb(struct sk_buff *skb,
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struct batadv_neigh_node *neigh)
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{
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#ifdef CONFIG_BATMAN_ADV_BATMAN_V
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struct batadv_hardif_neigh_node *hardif_neigh;
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#endif
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int ret;
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ret = batadv_send_skb_packet(skb, neigh->if_incoming, neigh->addr);
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#ifdef CONFIG_BATMAN_ADV_BATMAN_V
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hardif_neigh = batadv_hardif_neigh_get(neigh->if_incoming, neigh->addr);
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if (hardif_neigh && ret != NET_XMIT_DROP)
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hardif_neigh->bat_v.last_unicast_tx = jiffies;
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if (hardif_neigh)
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batadv_hardif_neigh_put(hardif_neigh);
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#endif
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return ret;
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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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* Return: negative errno code on a failure, -EINPROGRESS if the skb is
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* buffered for later transmit or the NET_XMIT status returned by the
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* lower routine if the packet has been passed down.
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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;
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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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ret = -EINVAL;
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goto free_skb;
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}
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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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ret = batadv_frag_send_packet(skb, orig_node, neigh_node);
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/* skb was consumed */
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skb = NULL;
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goto put_neigh_node;
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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 = -EINPROGRESS;
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else
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ret = batadv_send_unicast_skb(skb, neigh_node);
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/* skb was consumed */
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skb = NULL;
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put_neigh_node:
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batadv_neigh_node_put(neigh_node);
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free_skb:
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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_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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* Return: 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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u8 ttvn = (u8)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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ether_addr_copy(unicast_packet->dest, orig_node->orig);
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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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* Return: 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: the destination node
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* @packet_subtype: the unicast 4addr packet subtype to use
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*
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* Return: 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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ether_addr_copy(uc_4addr_packet->src, primary_if->net_dev->dev_addr);
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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_put(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.
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*
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* Return: NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise.
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*/
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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 batadv_unicast_packet *unicast_packet;
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struct ethhdr *ethhdr;
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int ret = NET_XMIT_DROP;
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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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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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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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/* skb->data might have been reallocated by
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* batadv_send_skb_prepare_unicast{,_4addr}()
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*/
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ethhdr = eth_hdr(skb);
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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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ret = batadv_send_skb_to_orig(skb, orig_node, NULL);
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/* skb was consumed */
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skb = NULL;
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out:
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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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* @dst_hint: can be used to override the destination contained in the skb
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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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* Return: 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, u8 *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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u8 *src, *dst;
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int ret;
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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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ret = batadv_send_skb_unicast(bat_priv, skb, packet_type,
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packet_subtype, orig_node, vid);
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if (orig_node)
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batadv_orig_node_put(orig_node);
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return ret;
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}
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|
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/**
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* batadv_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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* Return: 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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int ret;
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orig_node = batadv_gw_get_selected_orig(bat_priv);
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ret = batadv_send_skb_unicast(bat_priv, skb, BATADV_UNICAST_4ADDR,
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BATADV_P_DATA, orig_node, vid);
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if (orig_node)
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batadv_orig_node_put(orig_node);
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return ret;
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}
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/**
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* batadv_forw_packet_free() - free a forwarding packet
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* @forw_packet: The packet to free
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* @dropped: whether the packet is freed because is is dropped
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*
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* This frees a forwarding packet and releases any resources it might
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* have claimed.
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*/
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void batadv_forw_packet_free(struct batadv_forw_packet *forw_packet,
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bool dropped)
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{
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if (dropped)
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kfree_skb(forw_packet->skb);
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else
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consume_skb(forw_packet->skb);
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if (forw_packet->if_incoming)
|
|
batadv_hardif_put(forw_packet->if_incoming);
|
|
if (forw_packet->if_outgoing)
|
|
batadv_hardif_put(forw_packet->if_outgoing);
|
|
if (forw_packet->queue_left)
|
|
atomic_inc(forw_packet->queue_left);
|
|
kfree(forw_packet);
|
|
}
|
|
|
|
/**
|
|
* batadv_forw_packet_alloc() - allocate a forwarding packet
|
|
* @if_incoming: The (optional) if_incoming to be grabbed
|
|
* @if_outgoing: The (optional) if_outgoing to be grabbed
|
|
* @queue_left: The (optional) queue counter to decrease
|
|
* @bat_priv: The bat_priv for the mesh of this forw_packet
|
|
* @skb: The raw packet this forwarding packet shall contain
|
|
*
|
|
* Allocates a forwarding packet and tries to get a reference to the
|
|
* (optional) if_incoming, if_outgoing and queue_left. If queue_left
|
|
* is NULL then bat_priv is optional, too.
|
|
*
|
|
* Return: An allocated forwarding packet on success, NULL otherwise.
|
|
*/
|
|
struct batadv_forw_packet *
|
|
batadv_forw_packet_alloc(struct batadv_hard_iface *if_incoming,
|
|
struct batadv_hard_iface *if_outgoing,
|
|
atomic_t *queue_left,
|
|
struct batadv_priv *bat_priv,
|
|
struct sk_buff *skb)
|
|
{
|
|
struct batadv_forw_packet *forw_packet;
|
|
const char *qname;
|
|
|
|
if (queue_left && !batadv_atomic_dec_not_zero(queue_left)) {
|
|
qname = "unknown";
|
|
|
|
if (queue_left == &bat_priv->bcast_queue_left)
|
|
qname = "bcast";
|
|
|
|
if (queue_left == &bat_priv->batman_queue_left)
|
|
qname = "batman";
|
|
|
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
|
|
"%s queue is full\n", qname);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
forw_packet = kmalloc(sizeof(*forw_packet), GFP_ATOMIC);
|
|
if (!forw_packet)
|
|
goto err;
|
|
|
|
if (if_incoming)
|
|
kref_get(&if_incoming->refcount);
|
|
|
|
if (if_outgoing)
|
|
kref_get(&if_outgoing->refcount);
|
|
|
|
INIT_HLIST_NODE(&forw_packet->list);
|
|
INIT_HLIST_NODE(&forw_packet->cleanup_list);
|
|
forw_packet->skb = skb;
|
|
forw_packet->queue_left = queue_left;
|
|
forw_packet->if_incoming = if_incoming;
|
|
forw_packet->if_outgoing = if_outgoing;
|
|
forw_packet->num_packets = 0;
|
|
|
|
return forw_packet;
|
|
|
|
err:
|
|
if (queue_left)
|
|
atomic_inc(queue_left);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* batadv_forw_packet_was_stolen() - check whether someone stole this packet
|
|
* @forw_packet: the forwarding packet to check
|
|
*
|
|
* This function checks whether the given forwarding packet was claimed by
|
|
* someone else for free().
|
|
*
|
|
* Return: True if someone stole it, false otherwise.
|
|
*/
|
|
static bool
|
|
batadv_forw_packet_was_stolen(struct batadv_forw_packet *forw_packet)
|
|
{
|
|
return !hlist_unhashed(&forw_packet->cleanup_list);
|
|
}
|
|
|
|
/**
|
|
* batadv_forw_packet_steal() - claim a forw_packet for free()
|
|
* @forw_packet: the forwarding packet to steal
|
|
* @lock: a key to the store to steal from (e.g. forw_{bat,bcast}_list_lock)
|
|
*
|
|
* This function tries to steal a specific forw_packet from global
|
|
* visibility for the purpose of getting it for free(). That means
|
|
* the caller is *not* allowed to requeue it afterwards.
|
|
*
|
|
* Return: True if stealing was successful. False if someone else stole it
|
|
* before us.
|
|
*/
|
|
bool batadv_forw_packet_steal(struct batadv_forw_packet *forw_packet,
|
|
spinlock_t *lock)
|
|
{
|
|
/* did purging routine steal it earlier? */
|
|
spin_lock_bh(lock);
|
|
if (batadv_forw_packet_was_stolen(forw_packet)) {
|
|
spin_unlock_bh(lock);
|
|
return false;
|
|
}
|
|
|
|
hlist_del_init(&forw_packet->list);
|
|
|
|
/* Just to spot misuse of this function */
|
|
hlist_add_fake(&forw_packet->cleanup_list);
|
|
|
|
spin_unlock_bh(lock);
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* batadv_forw_packet_list_steal() - claim a list of forward packets for free()
|
|
* @forw_list: the to be stolen forward packets
|
|
* @cleanup_list: a backup pointer, to be able to dispose the packet later
|
|
* @hard_iface: the interface to steal forward packets from
|
|
*
|
|
* This function claims responsibility to free any forw_packet queued on the
|
|
* given hard_iface. If hard_iface is NULL forwarding packets on all hard
|
|
* interfaces will be claimed.
|
|
*
|
|
* The packets are being moved from the forw_list to the cleanup_list and
|
|
* by that allows already running threads to notice the claiming.
|
|
*/
|
|
static void
|
|
batadv_forw_packet_list_steal(struct hlist_head *forw_list,
|
|
struct hlist_head *cleanup_list,
|
|
const struct batadv_hard_iface *hard_iface)
|
|
{
|
|
struct batadv_forw_packet *forw_packet;
|
|
struct hlist_node *safe_tmp_node;
|
|
|
|
hlist_for_each_entry_safe(forw_packet, safe_tmp_node,
|
|
forw_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;
|
|
|
|
hlist_del(&forw_packet->list);
|
|
hlist_add_head(&forw_packet->cleanup_list, cleanup_list);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* batadv_forw_packet_list_free() - free a list of forward packets
|
|
* @head: a list of to be freed forw_packets
|
|
*
|
|
* This function cancels the scheduling of any packet in the provided list,
|
|
* waits for any possibly running packet forwarding thread to finish and
|
|
* finally, safely frees this forward packet.
|
|
*
|
|
* This function might sleep.
|
|
*/
|
|
static void batadv_forw_packet_list_free(struct hlist_head *head)
|
|
{
|
|
struct batadv_forw_packet *forw_packet;
|
|
struct hlist_node *safe_tmp_node;
|
|
|
|
hlist_for_each_entry_safe(forw_packet, safe_tmp_node, head,
|
|
cleanup_list) {
|
|
cancel_delayed_work_sync(&forw_packet->delayed_work);
|
|
|
|
hlist_del(&forw_packet->cleanup_list);
|
|
batadv_forw_packet_free(forw_packet, true);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* batadv_forw_packet_queue() - try to queue a forwarding packet
|
|
* @forw_packet: the forwarding packet to queue
|
|
* @lock: a key to the store (e.g. forw_{bat,bcast}_list_lock)
|
|
* @head: the shelve to queue it on (e.g. forw_{bat,bcast}_list)
|
|
* @send_time: timestamp (jiffies) when the packet is to be sent
|
|
*
|
|
* This function tries to (re)queue a forwarding packet. Requeuing
|
|
* is prevented if the according interface is shutting down
|
|
* (e.g. if batadv_forw_packet_list_steal() was called for this
|
|
* packet earlier).
|
|
*
|
|
* Calling batadv_forw_packet_queue() after a call to
|
|
* batadv_forw_packet_steal() is forbidden!
|
|
*
|
|
* Caller needs to ensure that forw_packet->delayed_work was initialized.
|
|
*/
|
|
static void batadv_forw_packet_queue(struct batadv_forw_packet *forw_packet,
|
|
spinlock_t *lock, struct hlist_head *head,
|
|
unsigned long send_time)
|
|
{
|
|
spin_lock_bh(lock);
|
|
|
|
/* did purging routine steal it from us? */
|
|
if (batadv_forw_packet_was_stolen(forw_packet)) {
|
|
/* If you got it for free() without trouble, then
|
|
* don't get back into the queue after stealing...
|
|
*/
|
|
WARN_ONCE(hlist_fake(&forw_packet->cleanup_list),
|
|
"Requeuing after batadv_forw_packet_steal() not allowed!\n");
|
|
|
|
spin_unlock_bh(lock);
|
|
return;
|
|
}
|
|
|
|
hlist_del_init(&forw_packet->list);
|
|
hlist_add_head(&forw_packet->list, head);
|
|
|
|
queue_delayed_work(batadv_event_workqueue,
|
|
&forw_packet->delayed_work,
|
|
send_time - jiffies);
|
|
spin_unlock_bh(lock);
|
|
}
|
|
|
|
/**
|
|
* batadv_forw_packet_bcast_queue() - try to queue a broadcast packet
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @forw_packet: the forwarding packet to queue
|
|
* @send_time: timestamp (jiffies) when the packet is to be sent
|
|
*
|
|
* This function tries to (re)queue a broadcast packet.
|
|
*
|
|
* Caller needs to ensure that forw_packet->delayed_work was initialized.
|
|
*/
|
|
static void
|
|
batadv_forw_packet_bcast_queue(struct batadv_priv *bat_priv,
|
|
struct batadv_forw_packet *forw_packet,
|
|
unsigned long send_time)
|
|
{
|
|
batadv_forw_packet_queue(forw_packet, &bat_priv->forw_bcast_list_lock,
|
|
&bat_priv->forw_bcast_list, send_time);
|
|
}
|
|
|
|
/**
|
|
* batadv_forw_packet_ogmv1_queue() - try to queue an OGMv1 packet
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @forw_packet: the forwarding packet to queue
|
|
* @send_time: timestamp (jiffies) when the packet is to be sent
|
|
*
|
|
* This function tries to (re)queue an OGMv1 packet.
|
|
*
|
|
* Caller needs to ensure that forw_packet->delayed_work was initialized.
|
|
*/
|
|
void batadv_forw_packet_ogmv1_queue(struct batadv_priv *bat_priv,
|
|
struct batadv_forw_packet *forw_packet,
|
|
unsigned long send_time)
|
|
{
|
|
batadv_forw_packet_queue(forw_packet, &bat_priv->forw_bat_list_lock,
|
|
&bat_priv->forw_bat_list, send_time);
|
|
}
|
|
|
|
/**
|
|
* batadv_add_bcast_packet_to_list() - queue broadcast packet for multiple sends
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @skb: broadcast packet to add
|
|
* @delay: number of jiffies to wait before sending
|
|
* @own_packet: true if it is a self-generated broadcast packet
|
|
*
|
|
* add a broadcast packet to the queue and setup timers. broadcast packets
|
|
* are sent multiple times to increase probability for being received.
|
|
*
|
|
* The skb is not consumed, so the caller should make sure that the
|
|
* skb is freed.
|
|
*
|
|
* Return: NETDEV_TX_OK on success and NETDEV_TX_BUSY on errors.
|
|
*/
|
|
int batadv_add_bcast_packet_to_list(struct batadv_priv *bat_priv,
|
|
const struct sk_buff *skb,
|
|
unsigned long delay,
|
|
bool own_packet)
|
|
{
|
|
struct batadv_hard_iface *primary_if;
|
|
struct batadv_forw_packet *forw_packet;
|
|
struct batadv_bcast_packet *bcast_packet;
|
|
struct sk_buff *newskb;
|
|
|
|
primary_if = batadv_primary_if_get_selected(bat_priv);
|
|
if (!primary_if)
|
|
goto err;
|
|
|
|
newskb = skb_copy(skb, GFP_ATOMIC);
|
|
if (!newskb) {
|
|
batadv_hardif_put(primary_if);
|
|
goto err;
|
|
}
|
|
|
|
forw_packet = batadv_forw_packet_alloc(primary_if, NULL,
|
|
&bat_priv->bcast_queue_left,
|
|
bat_priv, newskb);
|
|
batadv_hardif_put(primary_if);
|
|
if (!forw_packet)
|
|
goto err_packet_free;
|
|
|
|
/* as we have a copy now, it is safe to decrease the TTL */
|
|
bcast_packet = (struct batadv_bcast_packet *)newskb->data;
|
|
bcast_packet->ttl--;
|
|
|
|
forw_packet->own = own_packet;
|
|
|
|
INIT_DELAYED_WORK(&forw_packet->delayed_work,
|
|
batadv_send_outstanding_bcast_packet);
|
|
|
|
batadv_forw_packet_bcast_queue(bat_priv, forw_packet, jiffies + delay);
|
|
return NETDEV_TX_OK;
|
|
|
|
err_packet_free:
|
|
kfree_skb(newskb);
|
|
err:
|
|
return NETDEV_TX_BUSY;
|
|
}
|
|
|
|
/**
|
|
* batadv_forw_packet_bcasts_left() - check if a retransmission is necessary
|
|
* @forw_packet: the forwarding packet to check
|
|
* @hard_iface: the interface to check on
|
|
*
|
|
* Checks whether a given packet has any (re)transmissions left on the provided
|
|
* interface.
|
|
*
|
|
* hard_iface may be NULL: In that case the number of transmissions this skb had
|
|
* so far is compared with the maximum amount of retransmissions independent of
|
|
* any interface instead.
|
|
*
|
|
* Return: True if (re)transmissions are left, false otherwise.
|
|
*/
|
|
static bool
|
|
batadv_forw_packet_bcasts_left(struct batadv_forw_packet *forw_packet,
|
|
struct batadv_hard_iface *hard_iface)
|
|
{
|
|
unsigned int max;
|
|
|
|
if (hard_iface)
|
|
max = hard_iface->num_bcasts;
|
|
else
|
|
max = BATADV_NUM_BCASTS_MAX;
|
|
|
|
return BATADV_SKB_CB(forw_packet->skb)->num_bcasts < max;
|
|
}
|
|
|
|
/**
|
|
* batadv_forw_packet_bcasts_inc() - increment retransmission counter of a
|
|
* packet
|
|
* @forw_packet: the packet to increase the counter for
|
|
*/
|
|
static void
|
|
batadv_forw_packet_bcasts_inc(struct batadv_forw_packet *forw_packet)
|
|
{
|
|
BATADV_SKB_CB(forw_packet->skb)->num_bcasts++;
|
|
}
|
|
|
|
/**
|
|
* batadv_forw_packet_is_rebroadcast() - check packet for previous transmissions
|
|
* @forw_packet: the packet to check
|
|
*
|
|
* Return: True if this packet was transmitted before, false otherwise.
|
|
*/
|
|
bool batadv_forw_packet_is_rebroadcast(struct batadv_forw_packet *forw_packet)
|
|
{
|
|
return BATADV_SKB_CB(forw_packet->skb)->num_bcasts > 0;
|
|
}
|
|
|
|
static void batadv_send_outstanding_bcast_packet(struct work_struct *work)
|
|
{
|
|
struct batadv_hard_iface *hard_iface;
|
|
struct batadv_hardif_neigh_node *neigh_node;
|
|
struct delayed_work *delayed_work;
|
|
struct batadv_forw_packet *forw_packet;
|
|
struct batadv_bcast_packet *bcast_packet;
|
|
struct sk_buff *skb1;
|
|
struct net_device *soft_iface;
|
|
struct batadv_priv *bat_priv;
|
|
unsigned long send_time = jiffies + msecs_to_jiffies(5);
|
|
bool dropped = false;
|
|
u8 *neigh_addr;
|
|
u8 *orig_neigh;
|
|
int ret = 0;
|
|
|
|
delayed_work = to_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);
|
|
|
|
if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING) {
|
|
dropped = true;
|
|
goto out;
|
|
}
|
|
|
|
if (batadv_dat_drop_broadcast_packet(bat_priv, forw_packet)) {
|
|
dropped = true;
|
|
goto out;
|
|
}
|
|
|
|
bcast_packet = (struct batadv_bcast_packet *)forw_packet->skb->data;
|
|
|
|
/* 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 (!batadv_forw_packet_bcasts_left(forw_packet, hard_iface))
|
|
continue;
|
|
|
|
if (forw_packet->own) {
|
|
neigh_node = NULL;
|
|
} else {
|
|
neigh_addr = eth_hdr(forw_packet->skb)->h_source;
|
|
neigh_node = batadv_hardif_neigh_get(hard_iface,
|
|
neigh_addr);
|
|
}
|
|
|
|
orig_neigh = neigh_node ? neigh_node->orig : NULL;
|
|
|
|
ret = batadv_hardif_no_broadcast(hard_iface, bcast_packet->orig,
|
|
orig_neigh);
|
|
|
|
if (ret) {
|
|
char *type;
|
|
|
|
switch (ret) {
|
|
case BATADV_HARDIF_BCAST_NORECIPIENT:
|
|
type = "no neighbor";
|
|
break;
|
|
case BATADV_HARDIF_BCAST_DUPFWD:
|
|
type = "single neighbor is source";
|
|
break;
|
|
case BATADV_HARDIF_BCAST_DUPORIG:
|
|
type = "single neighbor is originator";
|
|
break;
|
|
default:
|
|
type = "unknown";
|
|
}
|
|
|
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "BCAST packet from orig %pM on %s suppressed: %s\n",
|
|
bcast_packet->orig,
|
|
hard_iface->net_dev->name, type);
|
|
|
|
if (neigh_node)
|
|
batadv_hardif_neigh_put(neigh_node);
|
|
|
|
continue;
|
|
}
|
|
|
|
if (neigh_node)
|
|
batadv_hardif_neigh_put(neigh_node);
|
|
|
|
if (!kref_get_unless_zero(&hard_iface->refcount))
|
|
continue;
|
|
|
|
/* send a copy of the saved skb */
|
|
skb1 = skb_clone(forw_packet->skb, GFP_ATOMIC);
|
|
if (skb1)
|
|
batadv_send_broadcast_skb(skb1, hard_iface);
|
|
|
|
batadv_hardif_put(hard_iface);
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
batadv_forw_packet_bcasts_inc(forw_packet);
|
|
|
|
/* if we still have some more bcasts to send */
|
|
if (batadv_forw_packet_bcasts_left(forw_packet, NULL)) {
|
|
batadv_forw_packet_bcast_queue(bat_priv, forw_packet,
|
|
send_time);
|
|
return;
|
|
}
|
|
|
|
out:
|
|
/* do we get something for free()? */
|
|
if (batadv_forw_packet_steal(forw_packet,
|
|
&bat_priv->forw_bcast_list_lock))
|
|
batadv_forw_packet_free(forw_packet, dropped);
|
|
}
|
|
|
|
/**
|
|
* batadv_purge_outstanding_packets() - stop/purge scheduled bcast/OGMv1 packets
|
|
* @bat_priv: the bat priv with all the soft interface information
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* @hard_iface: the hard interface to cancel and purge bcast/ogm packets on
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*
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* This method cancels and purges any broadcast and OGMv1 packet on the given
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* hard_iface. If hard_iface is NULL, broadcast and OGMv1 packets on all hard
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* interfaces will be canceled and purged.
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*
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* This function might sleep.
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*/
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void
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batadv_purge_outstanding_packets(struct batadv_priv *bat_priv,
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const struct batadv_hard_iface *hard_iface)
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{
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struct hlist_head head = HLIST_HEAD_INIT;
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if (hard_iface)
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batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
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"%s(): %s\n",
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__func__, hard_iface->net_dev->name);
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else
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batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
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"%s()\n", __func__);
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|
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/* claim bcast list for free() */
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spin_lock_bh(&bat_priv->forw_bcast_list_lock);
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batadv_forw_packet_list_steal(&bat_priv->forw_bcast_list, &head,
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hard_iface);
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spin_unlock_bh(&bat_priv->forw_bcast_list_lock);
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|
|
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/* claim batman packet list for free() */
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|
spin_lock_bh(&bat_priv->forw_bat_list_lock);
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batadv_forw_packet_list_steal(&bat_priv->forw_bat_list, &head,
|
|
hard_iface);
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spin_unlock_bh(&bat_priv->forw_bat_list_lock);
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|
|
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/* then cancel or wait for packet workers to finish and free */
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|
batadv_forw_packet_list_free(&head);
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}
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