diff options
Diffstat (limited to 'drivers/staging/batman-adv/send.c')
| -rw-r--r-- | drivers/staging/batman-adv/send.c | 580 |
1 files changed, 0 insertions, 580 deletions
diff --git a/drivers/staging/batman-adv/send.c b/drivers/staging/batman-adv/send.c deleted file mode 100644 index 7adf76ddd0b..00000000000 --- a/drivers/staging/batman-adv/send.c +++ /dev/null @@ -1,580 +0,0 @@ -/* - * 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" - - -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) -{ - return (tq * (TQ_MAX_VALUE - TQ_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; - - 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_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) -{ - unsigned long flags; - INIT_HLIST_NODE(&forw_packet->list); - - /* add new packet to packet list */ - spin_lock_irqsave(&bat_priv->forw_bcast_list_lock, flags); - hlist_add_head(&forw_packet->list, &bat_priv->forw_bcast_list); - spin_unlock_irqrestore(&bat_priv->forw_bcast_list_lock, flags); - - /* 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); - unsigned long flags; - 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_irqsave(&bat_priv->forw_bcast_list_lock, flags); - hlist_del(&forw_packet->list); - spin_unlock_irqrestore(&bat_priv->forw_bcast_list_lock, flags); - - 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); - unsigned long flags; - struct bat_priv *bat_priv; - - bat_priv = netdev_priv(forw_packet->if_incoming->soft_iface); - spin_lock_irqsave(&bat_priv->forw_bat_list_lock, flags); - hlist_del(&forw_packet->list); - spin_unlock_irqrestore(&bat_priv->forw_bat_list_lock, flags); - - 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; - unsigned long flags; - - 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_irqsave(&bat_priv->forw_bcast_list_lock, flags); - 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_irqrestore(&bat_priv->forw_bcast_list_lock, flags); - - /** - * 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_irqsave(&bat_priv->forw_bcast_list_lock, flags); - } - spin_unlock_irqrestore(&bat_priv->forw_bcast_list_lock, flags); - - /* free batman packet list */ - spin_lock_irqsave(&bat_priv->forw_bat_list_lock, flags); - 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_irqrestore(&bat_priv->forw_bat_list_lock, flags); - - /** - * 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_irqsave(&bat_priv->forw_bat_list_lock, flags); - } - spin_unlock_irqrestore(&bat_priv->forw_bat_list_lock, flags); -} |