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-rw-r--r--net/batman-adv/send.c585
1 files changed, 585 insertions, 0 deletions
diff --git a/net/batman-adv/send.c b/net/batman-adv/send.c
new file mode 100644
index 00000000000..b89b9f7709a
--- /dev/null
+++ b/net/batman-adv/send.c
@@ -0,0 +1,585 @@
+/*
+ * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors:
+ *
+ * Marek Lindner, Simon Wunderlich
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+#include "main.h"
+#include "send.h"
+#include "routing.h"
+#include "translation-table.h"
+#include "soft-interface.h"
+#include "hard-interface.h"
+#include "types.h"
+#include "vis.h"
+#include "aggregation.h"
+#include "gateway_common.h"
+#include "originator.h"
+
+static void send_outstanding_bcast_packet(struct work_struct *work);
+
+/* apply hop penalty for a normal link */
+static uint8_t hop_penalty(const uint8_t tq, struct bat_priv *bat_priv)
+{
+ int hop_penalty = atomic_read(&bat_priv->hop_penalty);
+ return (tq * (TQ_MAX_VALUE - hop_penalty)) / (TQ_MAX_VALUE);
+}
+
+/* when do we schedule our own packet to be sent */
+static unsigned long own_send_time(struct bat_priv *bat_priv)
+{
+ return jiffies + msecs_to_jiffies(
+ atomic_read(&bat_priv->orig_interval) -
+ JITTER + (random32() % 2*JITTER));
+}
+
+/* when do we schedule a forwarded packet to be sent */
+static unsigned long forward_send_time(struct bat_priv *bat_priv)
+{
+ return jiffies + msecs_to_jiffies(random32() % (JITTER/2));
+}
+
+/* send out an already prepared packet to the given address via the
+ * specified batman interface */
+int send_skb_packet(struct sk_buff *skb,
+ struct batman_if *batman_if,
+ uint8_t *dst_addr)
+{
+ struct ethhdr *ethhdr;
+
+ if (batman_if->if_status != IF_ACTIVE)
+ goto send_skb_err;
+
+ if (unlikely(!batman_if->net_dev))
+ goto send_skb_err;
+
+ if (!(batman_if->net_dev->flags & IFF_UP)) {
+ pr_warning("Interface %s is not up - can't send packet via "
+ "that interface!\n", batman_if->net_dev->name);
+ goto send_skb_err;
+ }
+
+ /* push to the ethernet header. */
+ if (my_skb_head_push(skb, sizeof(struct ethhdr)) < 0)
+ goto send_skb_err;
+
+ skb_reset_mac_header(skb);
+
+ ethhdr = (struct ethhdr *) skb_mac_header(skb);
+ memcpy(ethhdr->h_source, batman_if->net_dev->dev_addr, ETH_ALEN);
+ memcpy(ethhdr->h_dest, dst_addr, ETH_ALEN);
+ ethhdr->h_proto = __constant_htons(ETH_P_BATMAN);
+
+ skb_set_network_header(skb, ETH_HLEN);
+ skb->priority = TC_PRIO_CONTROL;
+ skb->protocol = __constant_htons(ETH_P_BATMAN);
+
+ skb->dev = batman_if->net_dev;
+
+ /* dev_queue_xmit() returns a negative result on error. However on
+ * congestion and traffic shaping, it drops and returns NET_XMIT_DROP
+ * (which is > 0). This will not be treated as an error. */
+
+ return dev_queue_xmit(skb);
+send_skb_err:
+ kfree_skb(skb);
+ return NET_XMIT_DROP;
+}
+
+/* Send a packet to a given interface */
+static void send_packet_to_if(struct forw_packet *forw_packet,
+ struct batman_if *batman_if)
+{
+ struct bat_priv *bat_priv = netdev_priv(batman_if->soft_iface);
+ char *fwd_str;
+ uint8_t packet_num;
+ int16_t buff_pos;
+ struct batman_packet *batman_packet;
+ struct sk_buff *skb;
+
+ if (batman_if->if_status != IF_ACTIVE)
+ return;
+
+ packet_num = 0;
+ buff_pos = 0;
+ batman_packet = (struct batman_packet *)forw_packet->skb->data;
+
+ /* adjust all flags and log packets */
+ while (aggregated_packet(buff_pos,
+ forw_packet->packet_len,
+ batman_packet->num_hna)) {
+
+ /* we might have aggregated direct link packets with an
+ * ordinary base packet */
+ if ((forw_packet->direct_link_flags & (1 << packet_num)) &&
+ (forw_packet->if_incoming == batman_if))
+ batman_packet->flags |= DIRECTLINK;
+ else
+ batman_packet->flags &= ~DIRECTLINK;
+
+ fwd_str = (packet_num > 0 ? "Forwarding" : (forw_packet->own ?
+ "Sending own" :
+ "Forwarding"));
+ bat_dbg(DBG_BATMAN, bat_priv,
+ "%s %spacket (originator %pM, seqno %d, TQ %d, TTL %d,"
+ " IDF %s) on interface %s [%pM]\n",
+ fwd_str, (packet_num > 0 ? "aggregated " : ""),
+ batman_packet->orig, ntohl(batman_packet->seqno),
+ batman_packet->tq, batman_packet->ttl,
+ (batman_packet->flags & DIRECTLINK ?
+ "on" : "off"),
+ batman_if->net_dev->name, batman_if->net_dev->dev_addr);
+
+ buff_pos += sizeof(struct batman_packet) +
+ (batman_packet->num_hna * ETH_ALEN);
+ packet_num++;
+ batman_packet = (struct batman_packet *)
+ (forw_packet->skb->data + buff_pos);
+ }
+
+ /* create clone because function is called more than once */
+ skb = skb_clone(forw_packet->skb, GFP_ATOMIC);
+ if (skb)
+ send_skb_packet(skb, batman_if, broadcast_addr);
+}
+
+/* send a batman packet */
+static void send_packet(struct forw_packet *forw_packet)
+{
+ struct batman_if *batman_if;
+ struct net_device *soft_iface;
+ struct bat_priv *bat_priv;
+ struct batman_packet *batman_packet =
+ (struct batman_packet *)(forw_packet->skb->data);
+ unsigned char directlink = (batman_packet->flags & DIRECTLINK ? 1 : 0);
+
+ if (!forw_packet->if_incoming) {
+ pr_err("Error - can't forward packet: incoming iface not "
+ "specified\n");
+ return;
+ }
+
+ soft_iface = forw_packet->if_incoming->soft_iface;
+ bat_priv = netdev_priv(soft_iface);
+
+ if (forw_packet->if_incoming->if_status != IF_ACTIVE)
+ return;
+
+ /* multihomed peer assumed */
+ /* non-primary OGMs are only broadcasted on their interface */
+ if ((directlink && (batman_packet->ttl == 1)) ||
+ (forw_packet->own && (forw_packet->if_incoming->if_num > 0))) {
+
+ /* FIXME: what about aggregated packets ? */
+ bat_dbg(DBG_BATMAN, bat_priv,
+ "%s packet (originator %pM, seqno %d, TTL %d) "
+ "on interface %s [%pM]\n",
+ (forw_packet->own ? "Sending own" : "Forwarding"),
+ batman_packet->orig, ntohl(batman_packet->seqno),
+ batman_packet->ttl,
+ forw_packet->if_incoming->net_dev->name,
+ forw_packet->if_incoming->net_dev->dev_addr);
+
+ /* skb is only used once and than forw_packet is free'd */
+ send_skb_packet(forw_packet->skb, forw_packet->if_incoming,
+ broadcast_addr);
+ forw_packet->skb = NULL;
+
+ return;
+ }
+
+ /* broadcast on every interface */
+ rcu_read_lock();
+ list_for_each_entry_rcu(batman_if, &if_list, list) {
+ if (batman_if->soft_iface != soft_iface)
+ continue;
+
+ send_packet_to_if(forw_packet, batman_if);
+ }
+ rcu_read_unlock();
+}
+
+static void rebuild_batman_packet(struct bat_priv *bat_priv,
+ struct batman_if *batman_if)
+{
+ int new_len;
+ unsigned char *new_buff;
+ struct batman_packet *batman_packet;
+
+ new_len = sizeof(struct batman_packet) +
+ (bat_priv->num_local_hna * ETH_ALEN);
+ new_buff = kmalloc(new_len, GFP_ATOMIC);
+
+ /* keep old buffer if kmalloc should fail */
+ if (new_buff) {
+ memcpy(new_buff, batman_if->packet_buff,
+ sizeof(struct batman_packet));
+ batman_packet = (struct batman_packet *)new_buff;
+
+ batman_packet->num_hna = hna_local_fill_buffer(bat_priv,
+ new_buff + sizeof(struct batman_packet),
+ new_len - sizeof(struct batman_packet));
+
+ kfree(batman_if->packet_buff);
+ batman_if->packet_buff = new_buff;
+ batman_if->packet_len = new_len;
+ }
+}
+
+void schedule_own_packet(struct batman_if *batman_if)
+{
+ struct bat_priv *bat_priv = netdev_priv(batman_if->soft_iface);
+ unsigned long send_time;
+ struct batman_packet *batman_packet;
+ int vis_server;
+
+ if ((batman_if->if_status == IF_NOT_IN_USE) ||
+ (batman_if->if_status == IF_TO_BE_REMOVED))
+ return;
+
+ vis_server = atomic_read(&bat_priv->vis_mode);
+
+ /**
+ * the interface gets activated here to avoid race conditions between
+ * the moment of activating the interface in
+ * hardif_activate_interface() where the originator mac is set and
+ * outdated packets (especially uninitialized mac addresses) in the
+ * packet queue
+ */
+ if (batman_if->if_status == IF_TO_BE_ACTIVATED)
+ batman_if->if_status = IF_ACTIVE;
+
+ /* if local hna has changed and interface is a primary interface */
+ if ((atomic_read(&bat_priv->hna_local_changed)) &&
+ (batman_if == bat_priv->primary_if))
+ rebuild_batman_packet(bat_priv, batman_if);
+
+ /**
+ * NOTE: packet_buff might just have been re-allocated in
+ * rebuild_batman_packet()
+ */
+ batman_packet = (struct batman_packet *)batman_if->packet_buff;
+
+ /* change sequence number to network order */
+ batman_packet->seqno =
+ htonl((uint32_t)atomic_read(&batman_if->seqno));
+
+ if (vis_server == VIS_TYPE_SERVER_SYNC)
+ batman_packet->flags |= VIS_SERVER;
+ else
+ batman_packet->flags &= ~VIS_SERVER;
+
+ if ((batman_if == bat_priv->primary_if) &&
+ (atomic_read(&bat_priv->gw_mode) == GW_MODE_SERVER))
+ batman_packet->gw_flags =
+ (uint8_t)atomic_read(&bat_priv->gw_bandwidth);
+ else
+ batman_packet->gw_flags = 0;
+
+ atomic_inc(&batman_if->seqno);
+
+ slide_own_bcast_window(batman_if);
+ send_time = own_send_time(bat_priv);
+ add_bat_packet_to_list(bat_priv,
+ batman_if->packet_buff,
+ batman_if->packet_len,
+ batman_if, 1, send_time);
+}
+
+void schedule_forward_packet(struct orig_node *orig_node,
+ struct ethhdr *ethhdr,
+ struct batman_packet *batman_packet,
+ uint8_t directlink, int hna_buff_len,
+ struct batman_if *if_incoming)
+{
+ struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
+ unsigned char in_tq, in_ttl, tq_avg = 0;
+ unsigned long send_time;
+
+ if (batman_packet->ttl <= 1) {
+ bat_dbg(DBG_BATMAN, bat_priv, "ttl exceeded\n");
+ return;
+ }
+
+ in_tq = batman_packet->tq;
+ in_ttl = batman_packet->ttl;
+
+ batman_packet->ttl--;
+ memcpy(batman_packet->prev_sender, ethhdr->h_source, ETH_ALEN);
+
+ /* rebroadcast tq of our best ranking neighbor to ensure the rebroadcast
+ * of our best tq value */
+ if ((orig_node->router) && (orig_node->router->tq_avg != 0)) {
+
+ /* rebroadcast ogm of best ranking neighbor as is */
+ if (!compare_orig(orig_node->router->addr, ethhdr->h_source)) {
+ batman_packet->tq = orig_node->router->tq_avg;
+
+ if (orig_node->router->last_ttl)
+ batman_packet->ttl = orig_node->router->last_ttl
+ - 1;
+ }
+
+ tq_avg = orig_node->router->tq_avg;
+ }
+
+ /* apply hop penalty */
+ batman_packet->tq = hop_penalty(batman_packet->tq, bat_priv);
+
+ bat_dbg(DBG_BATMAN, bat_priv,
+ "Forwarding packet: tq_orig: %i, tq_avg: %i, "
+ "tq_forw: %i, ttl_orig: %i, ttl_forw: %i\n",
+ in_tq, tq_avg, batman_packet->tq, in_ttl - 1,
+ batman_packet->ttl);
+
+ batman_packet->seqno = htonl(batman_packet->seqno);
+
+ /* switch of primaries first hop flag when forwarding */
+ batman_packet->flags &= ~PRIMARIES_FIRST_HOP;
+ if (directlink)
+ batman_packet->flags |= DIRECTLINK;
+ else
+ batman_packet->flags &= ~DIRECTLINK;
+
+ send_time = forward_send_time(bat_priv);
+ add_bat_packet_to_list(bat_priv,
+ (unsigned char *)batman_packet,
+ sizeof(struct batman_packet) + hna_buff_len,
+ if_incoming, 0, send_time);
+}
+
+static void forw_packet_free(struct forw_packet *forw_packet)
+{
+ if (forw_packet->skb)
+ kfree_skb(forw_packet->skb);
+ kfree(forw_packet);
+}
+
+static void _add_bcast_packet_to_list(struct bat_priv *bat_priv,
+ struct forw_packet *forw_packet,
+ unsigned long send_time)
+{
+ INIT_HLIST_NODE(&forw_packet->list);
+
+ /* add new packet to packet list */
+ spin_lock_bh(&bat_priv->forw_bcast_list_lock);
+ hlist_add_head(&forw_packet->list, &bat_priv->forw_bcast_list);
+ spin_unlock_bh(&bat_priv->forw_bcast_list_lock);
+
+ /* start timer for this packet */
+ INIT_DELAYED_WORK(&forw_packet->delayed_work,
+ send_outstanding_bcast_packet);
+ queue_delayed_work(bat_event_workqueue, &forw_packet->delayed_work,
+ send_time);
+}
+
+#define atomic_dec_not_zero(v) atomic_add_unless((v), -1, 0)
+/* add a broadcast packet to the queue and setup timers. broadcast packets
+ * are sent multiple times to increase probability for beeing received.
+ *
+ * This function returns NETDEV_TX_OK on success and NETDEV_TX_BUSY on
+ * errors.
+ *
+ * The skb is not consumed, so the caller should make sure that the
+ * skb is freed. */
+int add_bcast_packet_to_list(struct bat_priv *bat_priv, struct sk_buff *skb)
+{
+ struct forw_packet *forw_packet;
+ struct bcast_packet *bcast_packet;
+
+ if (!atomic_dec_not_zero(&bat_priv->bcast_queue_left)) {
+ bat_dbg(DBG_BATMAN, bat_priv, "bcast packet queue full\n");
+ goto out;
+ }
+
+ if (!bat_priv->primary_if)
+ goto out;
+
+ forw_packet = kmalloc(sizeof(struct forw_packet), GFP_ATOMIC);
+
+ if (!forw_packet)
+ goto out_and_inc;
+
+ skb = skb_copy(skb, GFP_ATOMIC);
+ if (!skb)
+ goto packet_free;
+
+ /* as we have a copy now, it is safe to decrease the TTL */
+ bcast_packet = (struct bcast_packet *)skb->data;
+ bcast_packet->ttl--;
+
+ skb_reset_mac_header(skb);
+
+ forw_packet->skb = skb;
+ forw_packet->if_incoming = bat_priv->primary_if;
+
+ /* how often did we send the bcast packet ? */
+ forw_packet->num_packets = 0;
+
+ _add_bcast_packet_to_list(bat_priv, forw_packet, 1);
+ return NETDEV_TX_OK;
+
+packet_free:
+ kfree(forw_packet);
+out_and_inc:
+ atomic_inc(&bat_priv->bcast_queue_left);
+out:
+ return NETDEV_TX_BUSY;
+}
+
+static void send_outstanding_bcast_packet(struct work_struct *work)
+{
+ struct batman_if *batman_if;
+ 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 sk_buff *skb1;
+ struct net_device *soft_iface = forw_packet->if_incoming->soft_iface;
+ struct bat_priv *bat_priv = netdev_priv(soft_iface);
+
+ spin_lock_bh(&bat_priv->forw_bcast_list_lock);
+ hlist_del(&forw_packet->list);
+ spin_unlock_bh(&bat_priv->forw_bcast_list_lock);
+
+ if (atomic_read(&bat_priv->mesh_state) == MESH_DEACTIVATING)
+ goto out;
+
+ /* rebroadcast packet */
+ rcu_read_lock();
+ list_for_each_entry_rcu(batman_if, &if_list, list) {
+ if (batman_if->soft_iface != soft_iface)
+ continue;
+
+ /* send a copy of the saved skb */
+ skb1 = skb_clone(forw_packet->skb, GFP_ATOMIC);
+ if (skb1)
+ send_skb_packet(skb1, batman_if, broadcast_addr);
+ }
+ rcu_read_unlock();
+
+ forw_packet->num_packets++;
+
+ /* 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);
+}