| /* |
| * 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" |
| |
| /* 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 + |
| (((atomic_read(&bat_priv->orig_interval) - JITTER + |
| (random32() % 2*JITTER)) * HZ) / 1000); |
| } |
| |
| /* when do we schedule a forwarded packet to be sent */ |
| static unsigned long forward_send_time(struct bat_priv *bat_priv) |
| { |
| return jiffies + (((random32() % (JITTER/2)) * HZ) / 1000); |
| } |
| |
| /* 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)) { |
| printk(KERN_WARNING |
| "batman-adv:Interface %s " |
| "is not up - can't send packet via that interface!\n", |
| batman_if->dev); |
| goto send_skb_err; |
| } |
| |
| /* push to the ethernet header. */ |
| if (my_skb_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; |
| } |
| |
| /* sends a raw packet. */ |
| void send_raw_packet(unsigned char *pack_buff, int pack_buff_len, |
| struct batman_if *batman_if, uint8_t *dst_addr) |
| { |
| struct sk_buff *skb; |
| char *data; |
| |
| skb = dev_alloc_skb(pack_buff_len + sizeof(struct ethhdr)); |
| if (!skb) |
| return; |
| data = skb_put(skb, pack_buff_len + sizeof(struct ethhdr)); |
| memcpy(data + sizeof(struct ethhdr), pack_buff, pack_buff_len); |
| /* pull back to the batman "network header" */ |
| skb_pull(skb, sizeof(struct ethhdr)); |
| send_skb_packet(skb, batman_if, dst_addr); |
| } |
| |
| /* Send a packet to a given interface */ |
| static void send_packet_to_if(struct forw_packet *forw_packet, |
| struct batman_if *batman_if) |
| { |
| char *fwd_str; |
| uint8_t packet_num; |
| int16_t buff_pos; |
| struct batman_packet *batman_packet; |
| |
| if (batman_if->if_status != IF_ACTIVE) |
| return; |
| |
| packet_num = 0; |
| buff_pos = 0; |
| batman_packet = (struct batman_packet *) |
| (forw_packet->packet_buff); |
| |
| /* 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, |
| "%s %spacket (originator %pM, seqno %d, TQ %d, TTL %d," |
| " IDF %s) on interface %s [%s]\n", |
| fwd_str, (packet_num > 0 ? "aggregated " : ""), |
| batman_packet->orig, ntohs(batman_packet->seqno), |
| batman_packet->tq, batman_packet->ttl, |
| (batman_packet->flags & DIRECTLINK ? |
| "on" : "off"), |
| batman_if->dev, batman_if->addr_str); |
| |
| buff_pos += sizeof(struct batman_packet) + |
| (batman_packet->num_hna * ETH_ALEN); |
| packet_num++; |
| batman_packet = (struct batman_packet *) |
| (forw_packet->packet_buff + buff_pos); |
| } |
| |
| send_raw_packet(forw_packet->packet_buff, |
| forw_packet->packet_len, |
| batman_if, broadcastAddr); |
| } |
| |
| /* send a batman packet */ |
| static void send_packet(struct forw_packet *forw_packet) |
| { |
| struct batman_if *batman_if; |
| struct batman_packet *batman_packet = |
| (struct batman_packet *)(forw_packet->packet_buff); |
| unsigned char directlink = (batman_packet->flags & DIRECTLINK ? 1 : 0); |
| |
| if (!forw_packet->if_incoming) { |
| printk(KERN_ERR "batman-adv: Error - can't forward packet: " |
| "incoming iface not specified\n"); |
| return; |
| } |
| |
| 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, |
| "%s packet (originator %pM, seqno %d, TTL %d) " |
| "on interface %s [%s]\n", |
| (forw_packet->own ? "Sending own" : "Forwarding"), |
| batman_packet->orig, ntohs(batman_packet->seqno), |
| batman_packet->ttl, forw_packet->if_incoming->dev, |
| forw_packet->if_incoming->addr_str); |
| |
| send_raw_packet(forw_packet->packet_buff, |
| forw_packet->packet_len, |
| forw_packet->if_incoming, |
| broadcastAddr); |
| return; |
| } |
| |
| /* broadcast on every interface */ |
| rcu_read_lock(); |
| list_for_each_entry_rcu(batman_if, &if_list, list) |
| send_packet_to_if(forw_packet, batman_if); |
| rcu_read_unlock(); |
| } |
| |
| static void rebuild_batman_packet(struct batman_if *batman_if) |
| { |
| int new_len; |
| unsigned char *new_buff; |
| struct batman_packet *batman_packet; |
| |
| new_len = sizeof(struct batman_packet) + (num_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( |
| 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) |
| { |
| /* FIXME: each batman_if will be attached to a softif */ |
| struct bat_priv *bat_priv = netdev_priv(soft_device); |
| 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(&hna_local_changed)) && |
| (batman_if == bat_priv->primary_if)) |
| rebuild_batman_packet(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 = htons((uint16_t)atomic_read(&batman_if->seqno)); |
| |
| if (vis_server == VIS_TYPE_SERVER_SYNC) |
| batman_packet->flags = VIS_SERVER; |
| else |
| batman_packet->flags &= ~VIS_SERVER; |
| |
| /* could be read by receive_bat_packet() */ |
| 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) |
| { |
| /* FIXME: each batman_if will be attached to a softif */ |
| struct bat_priv *bat_priv = netdev_priv(soft_device); |
| unsigned char in_tq, in_ttl, tq_avg = 0; |
| unsigned long send_time; |
| |
| if (batman_packet->ttl <= 1) { |
| bat_dbg(DBG_BATMAN, "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, "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 = htons(batman_packet->seqno); |
| |
| 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->packet_buff); |
| kfree(forw_packet); |
| } |
| |
| static void _add_bcast_packet_to_list(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(&forw_bcast_list_lock, flags); |
| hlist_add_head(&forw_packet->list, &forw_bcast_list); |
| spin_unlock_irqrestore(&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 sk_buff *skb) |
| { |
| struct forw_packet *forw_packet; |
| |
| if (!atomic_dec_not_zero(&bcast_queue_left)) { |
| bat_dbg(DBG_BATMAN, "bcast packet queue full\n"); |
| 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; |
| |
| skb_reset_mac_header(skb); |
| |
| forw_packet->skb = skb; |
| forw_packet->packet_buff = NULL; |
| |
| /* how often did we send the bcast packet ? */ |
| forw_packet->num_packets = 0; |
| |
| _add_bcast_packet_to_list(forw_packet, 1); |
| return NETDEV_TX_OK; |
| |
| packet_free: |
| kfree(forw_packet); |
| out_and_inc: |
| atomic_inc(&bcast_queue_left); |
| out: |
| return NETDEV_TX_BUSY; |
| } |
| |
| 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; |
| |
| spin_lock_irqsave(&forw_bcast_list_lock, flags); |
| hlist_del(&forw_packet->list); |
| spin_unlock_irqrestore(&forw_bcast_list_lock, flags); |
| |
| if (atomic_read(&module_state) == MODULE_DEACTIVATING) |
| goto out; |
| |
| /* rebroadcast packet */ |
| rcu_read_lock(); |
| list_for_each_entry_rcu(batman_if, &if_list, list) { |
| /* send a copy of the saved skb */ |
| skb1 = skb_copy(forw_packet->skb, GFP_ATOMIC); |
| if (skb1) |
| send_skb_packet(skb1, |
| batman_if, broadcastAddr); |
| } |
| 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(forw_packet, ((5 * HZ) / 1000)); |
| return; |
| } |
| |
| out: |
| forw_packet_free(forw_packet); |
| atomic_inc(&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; |
| |
| spin_lock_irqsave(&forw_bat_list_lock, flags); |
| hlist_del(&forw_packet->list); |
| spin_unlock_irqrestore(&forw_bat_list_lock, flags); |
| |
| if (atomic_read(&module_state) == MODULE_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(&batman_queue_left); |
| |
| forw_packet_free(forw_packet); |
| } |
| |
| void purge_outstanding_packets(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, "purge_outstanding_packets(): %s\n", |
| batman_if->dev); |
| else |
| bat_dbg(DBG_BATMAN, "purge_outstanding_packets()\n"); |
| |
| /* free bcast list */ |
| spin_lock_irqsave(&forw_bcast_list_lock, flags); |
| hlist_for_each_entry_safe(forw_packet, tmp_node, safe_tmp_node, |
| &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(&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(&forw_bcast_list_lock, flags); |
| } |
| spin_unlock_irqrestore(&forw_bcast_list_lock, flags); |
| |
| /* free batman packet list */ |
| spin_lock_irqsave(&forw_bat_list_lock, flags); |
| hlist_for_each_entry_safe(forw_packet, tmp_node, safe_tmp_node, |
| &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(&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(&forw_bat_list_lock, flags); |
| } |
| spin_unlock_irqrestore(&forw_bat_list_lock, flags); |
| } |