585 lines
17 KiB
C
585 lines
17 KiB
C
/*
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* Copyright (C) 2007-2011 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 "types.h"
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#include "vis.h"
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#include "aggregation.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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/* apply hop penalty for a normal link */
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static uint8_t hop_penalty(const uint8_t tq, struct bat_priv *bat_priv)
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{
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int hop_penalty = atomic_read(&bat_priv->hop_penalty);
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return (tq * (TQ_MAX_VALUE - hop_penalty)) / (TQ_MAX_VALUE);
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}
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/* when do we schedule our own packet to be sent */
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static unsigned long own_send_time(struct bat_priv *bat_priv)
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{
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return jiffies + msecs_to_jiffies(
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atomic_read(&bat_priv->orig_interval) -
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JITTER + (random32() % 2*JITTER));
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}
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/* when do we schedule a forwarded packet to be sent */
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static unsigned long forward_send_time(void)
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{
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return jiffies + msecs_to_jiffies(random32() % (JITTER/2));
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}
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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,
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struct batman_if *batman_if,
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uint8_t *dst_addr)
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{
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struct ethhdr *ethhdr;
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if (batman_if->if_status != IF_ACTIVE)
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goto send_skb_err;
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if (unlikely(!batman_if->net_dev))
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goto send_skb_err;
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if (!(batman_if->net_dev->flags & IFF_UP)) {
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pr_warning("Interface %s is not up - can't send packet via "
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"that interface!\n", batman_if->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, sizeof(struct ethhdr)) < 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, batman_if->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 = batman_if->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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/* Send a packet to a given interface */
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static void send_packet_to_if(struct forw_packet *forw_packet,
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struct batman_if *batman_if)
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{
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struct bat_priv *bat_priv = netdev_priv(batman_if->soft_iface);
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char *fwd_str;
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uint8_t packet_num;
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int16_t buff_pos;
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struct batman_packet *batman_packet;
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struct sk_buff *skb;
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if (batman_if->if_status != IF_ACTIVE)
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return;
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packet_num = 0;
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buff_pos = 0;
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batman_packet = (struct batman_packet *)forw_packet->skb->data;
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/* adjust all flags and log packets */
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while (aggregated_packet(buff_pos,
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forw_packet->packet_len,
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batman_packet->num_hna)) {
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/* we might have aggregated direct link packets with an
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* ordinary base packet */
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if ((forw_packet->direct_link_flags & (1 << packet_num)) &&
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(forw_packet->if_incoming == batman_if))
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batman_packet->flags |= DIRECTLINK;
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else
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batman_packet->flags &= ~DIRECTLINK;
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fwd_str = (packet_num > 0 ? "Forwarding" : (forw_packet->own ?
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"Sending own" :
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"Forwarding"));
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bat_dbg(DBG_BATMAN, bat_priv,
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"%s %spacket (originator %pM, seqno %d, TQ %d, TTL %d,"
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" IDF %s) on interface %s [%pM]\n",
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fwd_str, (packet_num > 0 ? "aggregated " : ""),
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batman_packet->orig, ntohl(batman_packet->seqno),
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batman_packet->tq, batman_packet->ttl,
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(batman_packet->flags & DIRECTLINK ?
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"on" : "off"),
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batman_if->net_dev->name, batman_if->net_dev->dev_addr);
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buff_pos += sizeof(struct batman_packet) +
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(batman_packet->num_hna * ETH_ALEN);
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packet_num++;
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batman_packet = (struct batman_packet *)
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(forw_packet->skb->data + buff_pos);
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}
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/* create clone because function is called more than once */
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skb = skb_clone(forw_packet->skb, GFP_ATOMIC);
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if (skb)
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send_skb_packet(skb, batman_if, broadcast_addr);
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}
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/* send a batman packet */
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static void send_packet(struct forw_packet *forw_packet)
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{
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struct batman_if *batman_if;
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struct net_device *soft_iface;
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struct bat_priv *bat_priv;
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struct batman_packet *batman_packet =
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(struct batman_packet *)(forw_packet->skb->data);
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unsigned char directlink = (batman_packet->flags & DIRECTLINK ? 1 : 0);
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if (!forw_packet->if_incoming) {
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pr_err("Error - can't forward packet: incoming iface not "
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"specified\n");
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return;
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}
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soft_iface = forw_packet->if_incoming->soft_iface;
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bat_priv = netdev_priv(soft_iface);
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if (forw_packet->if_incoming->if_status != IF_ACTIVE)
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return;
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/* multihomed peer assumed */
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/* non-primary OGMs are only broadcasted on their interface */
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if ((directlink && (batman_packet->ttl == 1)) ||
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(forw_packet->own && (forw_packet->if_incoming->if_num > 0))) {
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/* FIXME: what about aggregated packets ? */
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bat_dbg(DBG_BATMAN, bat_priv,
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"%s packet (originator %pM, seqno %d, TTL %d) "
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"on interface %s [%pM]\n",
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(forw_packet->own ? "Sending own" : "Forwarding"),
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batman_packet->orig, ntohl(batman_packet->seqno),
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batman_packet->ttl,
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forw_packet->if_incoming->net_dev->name,
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forw_packet->if_incoming->net_dev->dev_addr);
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/* skb is only used once and than forw_packet is free'd */
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send_skb_packet(forw_packet->skb, forw_packet->if_incoming,
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broadcast_addr);
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forw_packet->skb = NULL;
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return;
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}
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/* broadcast on every interface */
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rcu_read_lock();
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list_for_each_entry_rcu(batman_if, &if_list, list) {
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if (batman_if->soft_iface != soft_iface)
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continue;
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send_packet_to_if(forw_packet, batman_if);
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}
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rcu_read_unlock();
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}
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static void rebuild_batman_packet(struct bat_priv *bat_priv,
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struct batman_if *batman_if)
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{
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int new_len;
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unsigned char *new_buff;
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struct batman_packet *batman_packet;
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new_len = sizeof(struct batman_packet) +
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(bat_priv->num_local_hna * ETH_ALEN);
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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, batman_if->packet_buff,
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sizeof(struct batman_packet));
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batman_packet = (struct batman_packet *)new_buff;
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batman_packet->num_hna = hna_local_fill_buffer(bat_priv,
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new_buff + sizeof(struct batman_packet),
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new_len - sizeof(struct batman_packet));
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kfree(batman_if->packet_buff);
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batman_if->packet_buff = new_buff;
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batman_if->packet_len = new_len;
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}
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}
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void schedule_own_packet(struct batman_if *batman_if)
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{
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struct bat_priv *bat_priv = netdev_priv(batman_if->soft_iface);
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unsigned long send_time;
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struct batman_packet *batman_packet;
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int vis_server;
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if ((batman_if->if_status == IF_NOT_IN_USE) ||
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(batman_if->if_status == IF_TO_BE_REMOVED))
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return;
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vis_server = atomic_read(&bat_priv->vis_mode);
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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 (batman_if->if_status == IF_TO_BE_ACTIVATED)
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batman_if->if_status = IF_ACTIVE;
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/* if local hna has changed and interface is a primary interface */
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if ((atomic_read(&bat_priv->hna_local_changed)) &&
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(batman_if == bat_priv->primary_if))
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rebuild_batman_packet(bat_priv, batman_if);
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/**
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* NOTE: packet_buff might just have been re-allocated in
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* rebuild_batman_packet()
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*/
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batman_packet = (struct batman_packet *)batman_if->packet_buff;
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/* change sequence number to network order */
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batman_packet->seqno =
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htonl((uint32_t)atomic_read(&batman_if->seqno));
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if (vis_server == VIS_TYPE_SERVER_SYNC)
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batman_packet->flags |= VIS_SERVER;
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else
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batman_packet->flags &= ~VIS_SERVER;
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if ((batman_if == bat_priv->primary_if) &&
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(atomic_read(&bat_priv->gw_mode) == GW_MODE_SERVER))
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batman_packet->gw_flags =
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(uint8_t)atomic_read(&bat_priv->gw_bandwidth);
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else
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batman_packet->gw_flags = 0;
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atomic_inc(&batman_if->seqno);
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slide_own_bcast_window(batman_if);
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send_time = own_send_time(bat_priv);
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add_bat_packet_to_list(bat_priv,
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batman_if->packet_buff,
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batman_if->packet_len,
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batman_if, 1, send_time);
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}
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void schedule_forward_packet(struct orig_node *orig_node,
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struct ethhdr *ethhdr,
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struct batman_packet *batman_packet,
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uint8_t directlink, int hna_buff_len,
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struct batman_if *if_incoming)
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{
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struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
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unsigned char in_tq, in_ttl, tq_avg = 0;
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unsigned long send_time;
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if (batman_packet->ttl <= 1) {
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bat_dbg(DBG_BATMAN, bat_priv, "ttl exceeded\n");
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return;
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}
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in_tq = batman_packet->tq;
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in_ttl = batman_packet->ttl;
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batman_packet->ttl--;
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memcpy(batman_packet->prev_sender, ethhdr->h_source, ETH_ALEN);
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/* rebroadcast tq of our best ranking neighbor to ensure the rebroadcast
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* of our best tq value */
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if ((orig_node->router) && (orig_node->router->tq_avg != 0)) {
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/* rebroadcast ogm of best ranking neighbor as is */
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if (!compare_orig(orig_node->router->addr, ethhdr->h_source)) {
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batman_packet->tq = orig_node->router->tq_avg;
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if (orig_node->router->last_ttl)
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batman_packet->ttl = orig_node->router->last_ttl
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- 1;
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}
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tq_avg = orig_node->router->tq_avg;
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}
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/* apply hop penalty */
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batman_packet->tq = hop_penalty(batman_packet->tq, bat_priv);
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bat_dbg(DBG_BATMAN, bat_priv,
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"Forwarding packet: tq_orig: %i, tq_avg: %i, "
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"tq_forw: %i, ttl_orig: %i, ttl_forw: %i\n",
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in_tq, tq_avg, batman_packet->tq, in_ttl - 1,
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batman_packet->ttl);
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batman_packet->seqno = htonl(batman_packet->seqno);
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/* switch of primaries first hop flag when forwarding */
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batman_packet->flags &= ~PRIMARIES_FIRST_HOP;
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if (directlink)
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batman_packet->flags |= DIRECTLINK;
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else
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batman_packet->flags &= ~DIRECTLINK;
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send_time = forward_send_time();
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add_bat_packet_to_list(bat_priv,
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(unsigned char *)batman_packet,
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sizeof(struct batman_packet) + hna_buff_len,
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if_incoming, 0, send_time);
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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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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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#define atomic_dec_not_zero(v) atomic_add_unless((v), -1, 0)
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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 beeing 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, struct sk_buff *skb)
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{
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struct forw_packet *forw_packet;
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struct bcast_packet *bcast_packet;
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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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if (!bat_priv->primary_if)
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goto out;
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forw_packet = kmalloc(sizeof(struct forw_packet), GFP_ATOMIC);
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if (!forw_packet)
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goto out_and_inc;
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skb = skb_copy(skb, GFP_ATOMIC);
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if (!skb)
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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 *)skb->data;
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bcast_packet->ttl--;
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skb_reset_mac_header(skb);
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forw_packet->skb = skb;
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forw_packet->if_incoming = bat_priv->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, 1);
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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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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 batman_if *batman_if;
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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(batman_if, &if_list, list) {
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if (batman_if->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, batman_if, 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 */
|
|
if (forw_packet->num_packets < 3) {
|
|
_add_bcast_packet_to_list(bat_priv, forw_packet,
|
|
((5 * HZ) / 1000));
|
|
return;
|
|
}
|
|
|
|
out:
|
|
forw_packet_free(forw_packet);
|
|
atomic_inc(&bat_priv->bcast_queue_left);
|
|
}
|
|
|
|
void send_outstanding_bat_packet(struct work_struct *work)
|
|
{
|
|
struct delayed_work *delayed_work =
|
|
container_of(work, struct delayed_work, work);
|
|
struct forw_packet *forw_packet =
|
|
container_of(delayed_work, struct forw_packet, delayed_work);
|
|
struct bat_priv *bat_priv;
|
|
|
|
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) == MESH_DEACTIVATING)
|
|
goto out;
|
|
|
|
send_packet(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
|
|
*/
|
|
if (forw_packet->own)
|
|
schedule_own_packet(forw_packet->if_incoming);
|
|
|
|
out:
|
|
/* don't count own packet */
|
|
if (!forw_packet->own)
|
|
atomic_inc(&bat_priv->batman_queue_left);
|
|
|
|
forw_packet_free(forw_packet);
|
|
}
|
|
|
|
void purge_outstanding_packets(struct bat_priv *bat_priv,
|
|
struct batman_if *batman_if)
|
|
{
|
|
struct forw_packet *forw_packet;
|
|
struct hlist_node *tmp_node, *safe_tmp_node;
|
|
|
|
if (batman_if)
|
|
bat_dbg(DBG_BATMAN, bat_priv,
|
|
"purge_outstanding_packets(): %s\n",
|
|
batman_if->net_dev->name);
|
|
else
|
|
bat_dbg(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, tmp_node, safe_tmp_node,
|
|
&bat_priv->forw_bcast_list, list) {
|
|
|
|
/**
|
|
* if purge_outstanding_packets() was called with an argmument
|
|
* we delete only packets belonging to the given interface
|
|
*/
|
|
if ((batman_if) &&
|
|
(forw_packet->if_incoming != batman_if))
|
|
continue;
|
|
|
|
spin_unlock_bh(&bat_priv->forw_bcast_list_lock);
|
|
|
|
/**
|
|
* send_outstanding_bcast_packet() will lock the list to
|
|
* delete the item from the list
|
|
*/
|
|
cancel_delayed_work_sync(&forw_packet->delayed_work);
|
|
spin_lock_bh(&bat_priv->forw_bcast_list_lock);
|
|
}
|
|
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, tmp_node, safe_tmp_node,
|
|
&bat_priv->forw_bat_list, list) {
|
|
|
|
/**
|
|
* if purge_outstanding_packets() was called with an argmument
|
|
* we delete only packets belonging to the given interface
|
|
*/
|
|
if ((batman_if) &&
|
|
(forw_packet->if_incoming != batman_if))
|
|
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
|
|
*/
|
|
cancel_delayed_work_sync(&forw_packet->delayed_work);
|
|
spin_lock_bh(&bat_priv->forw_bat_list_lock);
|
|
}
|
|
spin_unlock_bh(&bat_priv->forw_bat_list_lock);
|
|
}
|