411 lines
11 KiB
C
411 lines
11 KiB
C
/*
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* Copyright (C) 2007-2012 B.A.T.M.A.N. contributors:
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*
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* Marek Lindner, Simon Wunderlich
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA
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*
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*/
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#include "main.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 "vis.h"
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#include "gateway_common.h"
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#include "originator.h"
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static void 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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int send_skb_packet(struct sk_buff *skb, struct hard_iface *hard_iface,
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const uint8_t *dst_addr)
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{
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struct ethhdr *ethhdr;
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if (hard_iface->if_status != 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 (my_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 = (struct ethhdr *)skb_mac_header(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 = __constant_htons(ETH_P_BATMAN);
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skb_set_network_header(skb, ETH_HLEN);
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skb->priority = TC_PRIO_CONTROL;
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skb->protocol = __constant_htons(ETH_P_BATMAN);
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skb->dev = hard_iface->net_dev;
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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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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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static void realloc_packet_buffer(struct hard_iface *hard_iface,
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int new_len)
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{
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unsigned char *new_buff;
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new_buff = kmalloc(new_len, GFP_ATOMIC);
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/* keep old buffer if kmalloc should fail */
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if (new_buff) {
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memcpy(new_buff, hard_iface->packet_buff,
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BATMAN_OGM_HLEN);
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kfree(hard_iface->packet_buff);
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hard_iface->packet_buff = new_buff;
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hard_iface->packet_len = new_len;
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}
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}
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/* when calling this function (hard_iface == primary_if) has to be true */
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static int prepare_packet_buffer(struct bat_priv *bat_priv,
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struct hard_iface *hard_iface)
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{
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int new_len;
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new_len = BATMAN_OGM_HLEN +
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tt_len((uint8_t)atomic_read(&bat_priv->tt_local_changes));
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/* if we have too many changes for one packet don't send any
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* and wait for the tt table request which will be fragmented */
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if (new_len > hard_iface->soft_iface->mtu)
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new_len = BATMAN_OGM_HLEN;
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realloc_packet_buffer(hard_iface, new_len);
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bat_priv->tt_crc = tt_local_crc(bat_priv);
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/* reset the sending counter */
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atomic_set(&bat_priv->tt_ogm_append_cnt, TT_OGM_APPEND_MAX);
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return tt_changes_fill_buffer(bat_priv,
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hard_iface->packet_buff + BATMAN_OGM_HLEN,
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hard_iface->packet_len - BATMAN_OGM_HLEN);
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}
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static int reset_packet_buffer(struct bat_priv *bat_priv,
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struct hard_iface *hard_iface)
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{
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realloc_packet_buffer(hard_iface, BATMAN_OGM_HLEN);
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return 0;
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}
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void schedule_bat_ogm(struct hard_iface *hard_iface)
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{
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struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
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struct hard_iface *primary_if;
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int tt_num_changes = -1;
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if ((hard_iface->if_status == IF_NOT_IN_USE) ||
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(hard_iface->if_status == IF_TO_BE_REMOVED))
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return;
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/**
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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 == IF_TO_BE_ACTIVATED)
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hard_iface->if_status = IF_ACTIVE;
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primary_if = primary_if_get_selected(bat_priv);
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if (hard_iface == primary_if) {
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/* if at least one change happened */
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if (atomic_read(&bat_priv->tt_local_changes) > 0) {
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tt_commit_changes(bat_priv);
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tt_num_changes = prepare_packet_buffer(bat_priv,
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hard_iface);
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}
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/* if the changes have been sent often enough */
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if (!atomic_dec_not_zero(&bat_priv->tt_ogm_append_cnt))
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tt_num_changes = reset_packet_buffer(bat_priv,
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hard_iface);
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}
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if (primary_if)
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hardif_free_ref(primary_if);
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bat_priv->bat_algo_ops->bat_ogm_schedule(hard_iface, tt_num_changes);
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}
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static void forw_packet_free(struct 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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hardif_free_ref(forw_packet->if_incoming);
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kfree(forw_packet);
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}
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static void _add_bcast_packet_to_list(struct bat_priv *bat_priv,
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struct forw_packet *forw_packet,
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unsigned long send_time)
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{
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INIT_HLIST_NODE(&forw_packet->list);
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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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INIT_DELAYED_WORK(&forw_packet->delayed_work,
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send_outstanding_bcast_packet);
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queue_delayed_work(bat_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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int add_bcast_packet_to_list(struct bat_priv *bat_priv,
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const struct sk_buff *skb, unsigned long delay)
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{
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struct hard_iface *primary_if = NULL;
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struct forw_packet *forw_packet;
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struct bcast_packet *bcast_packet;
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struct sk_buff *newskb;
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if (!atomic_dec_not_zero(&bat_priv->bcast_queue_left)) {
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bat_dbg(DBG_BATMAN, bat_priv, "bcast packet queue full\n");
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goto out;
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}
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primary_if = 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 bcast_packet *)newskb->data;
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bcast_packet->header.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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/* how often did we send the bcast packet ? */
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forw_packet->num_packets = 0;
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_add_bcast_packet_to_list(bat_priv, forw_packet, delay);
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return NETDEV_TX_OK;
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packet_free:
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kfree(forw_packet);
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out_and_inc:
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atomic_inc(&bat_priv->bcast_queue_left);
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out:
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if (primary_if)
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hardif_free_ref(primary_if);
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return NETDEV_TX_BUSY;
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}
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static void send_outstanding_bcast_packet(struct work_struct *work)
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{
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struct hard_iface *hard_iface;
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struct delayed_work *delayed_work =
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container_of(work, struct delayed_work, work);
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struct forw_packet *forw_packet =
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container_of(delayed_work, struct forw_packet, delayed_work);
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struct sk_buff *skb1;
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struct net_device *soft_iface = forw_packet->if_incoming->soft_iface;
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struct bat_priv *bat_priv = netdev_priv(soft_iface);
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spin_lock_bh(&bat_priv->forw_bcast_list_lock);
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hlist_del(&forw_packet->list);
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spin_unlock_bh(&bat_priv->forw_bcast_list_lock);
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if (atomic_read(&bat_priv->mesh_state) == MESH_DEACTIVATING)
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goto out;
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/* rebroadcast packet */
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rcu_read_lock();
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list_for_each_entry_rcu(hard_iface, &hardif_list, list) {
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if (hard_iface->soft_iface != soft_iface)
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continue;
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/* send a copy of the saved skb */
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skb1 = skb_clone(forw_packet->skb, GFP_ATOMIC);
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if (skb1)
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send_skb_packet(skb1, hard_iface, broadcast_addr);
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}
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rcu_read_unlock();
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forw_packet->num_packets++;
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/* if we still have some more bcasts to send */
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if (forw_packet->num_packets < 3) {
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_add_bcast_packet_to_list(bat_priv, forw_packet,
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msecs_to_jiffies(5));
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return;
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}
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out:
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forw_packet_free(forw_packet);
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atomic_inc(&bat_priv->bcast_queue_left);
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}
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void send_outstanding_bat_ogm_packet(struct work_struct *work)
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{
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struct delayed_work *delayed_work =
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container_of(work, struct delayed_work, work);
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struct forw_packet *forw_packet =
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container_of(delayed_work, struct forw_packet, delayed_work);
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struct bat_priv *bat_priv;
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bat_priv = netdev_priv(forw_packet->if_incoming->soft_iface);
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spin_lock_bh(&bat_priv->forw_bat_list_lock);
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hlist_del(&forw_packet->list);
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spin_unlock_bh(&bat_priv->forw_bat_list_lock);
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if (atomic_read(&bat_priv->mesh_state) == MESH_DEACTIVATING)
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goto out;
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bat_priv->bat_algo_ops->bat_ogm_emit(forw_packet);
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/**
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* we have to have at least one packet in the queue
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* to determine the queues wake up time unless we are
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* shutting down
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*/
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if (forw_packet->own)
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schedule_bat_ogm(forw_packet->if_incoming);
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out:
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/* don't count own packet */
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if (!forw_packet->own)
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atomic_inc(&bat_priv->batman_queue_left);
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forw_packet_free(forw_packet);
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}
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void purge_outstanding_packets(struct bat_priv *bat_priv,
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const struct hard_iface *hard_iface)
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{
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struct forw_packet *forw_packet;
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struct hlist_node *tmp_node, *safe_tmp_node;
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bool pending;
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if (hard_iface)
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bat_dbg(DBG_BATMAN, bat_priv,
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"purge_outstanding_packets(): %s\n",
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hard_iface->net_dev->name);
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else
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bat_dbg(DBG_BATMAN, bat_priv,
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"purge_outstanding_packets()\n");
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/* free bcast list */
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spin_lock_bh(&bat_priv->forw_bcast_list_lock);
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hlist_for_each_entry_safe(forw_packet, tmp_node, safe_tmp_node,
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&bat_priv->forw_bcast_list, list) {
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/**
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* if purge_outstanding_packets() was called with an argument
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* we delete only packets belonging to the given interface
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*/
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if ((hard_iface) &&
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(forw_packet->if_incoming != hard_iface))
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continue;
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spin_unlock_bh(&bat_priv->forw_bcast_list_lock);
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/**
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* send_outstanding_bcast_packet() will lock the list to
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* delete the item from the list
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*/
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pending = cancel_delayed_work_sync(&forw_packet->delayed_work);
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spin_lock_bh(&bat_priv->forw_bcast_list_lock);
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if (pending) {
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hlist_del(&forw_packet->list);
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forw_packet_free(forw_packet);
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}
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}
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spin_unlock_bh(&bat_priv->forw_bcast_list_lock);
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/* free batman packet list */
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spin_lock_bh(&bat_priv->forw_bat_list_lock);
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hlist_for_each_entry_safe(forw_packet, tmp_node, safe_tmp_node,
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&bat_priv->forw_bat_list, list) {
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/**
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* if purge_outstanding_packets() was called with an argument
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* we delete only packets belonging to the given interface
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*/
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if ((hard_iface) &&
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(forw_packet->if_incoming != hard_iface))
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continue;
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spin_unlock_bh(&bat_priv->forw_bat_list_lock);
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/**
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* send_outstanding_bat_packet() will lock the list to
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* delete the item from the list
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*/
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pending = cancel_delayed_work_sync(&forw_packet->delayed_work);
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spin_lock_bh(&bat_priv->forw_bat_list_lock);
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if (pending) {
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hlist_del(&forw_packet->list);
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forw_packet_free(forw_packet);
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}
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}
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spin_unlock_bh(&bat_priv->forw_bat_list_lock);
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}
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