Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1 | /* |
Sven Eckelmann | 64afe35 | 2011-01-27 10:38:15 +0100 | [diff] [blame] | 2 | * Copyright (C) 2007-2011 B.A.T.M.A.N. contributors: |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 3 | * |
| 4 | * Marek Lindner, Simon Wunderlich |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of version 2 of the GNU General Public |
| 8 | * License as published by the Free Software Foundation. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, but |
| 11 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | * General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write to the Free Software |
| 17 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 18 | * 02110-1301, USA |
| 19 | * |
| 20 | */ |
| 21 | |
| 22 | #include "main.h" |
| 23 | #include "send.h" |
| 24 | #include "routing.h" |
| 25 | #include "translation-table.h" |
| 26 | #include "soft-interface.h" |
| 27 | #include "hard-interface.h" |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 28 | #include "vis.h" |
| 29 | #include "aggregation.h" |
| 30 | #include "gateway_common.h" |
| 31 | #include "originator.h" |
| 32 | |
| 33 | static void send_outstanding_bcast_packet(struct work_struct *work); |
| 34 | |
| 35 | /* apply hop penalty for a normal link */ |
| 36 | static uint8_t hop_penalty(const uint8_t tq, struct bat_priv *bat_priv) |
| 37 | { |
| 38 | int hop_penalty = atomic_read(&bat_priv->hop_penalty); |
| 39 | return (tq * (TQ_MAX_VALUE - hop_penalty)) / (TQ_MAX_VALUE); |
| 40 | } |
| 41 | |
| 42 | /* when do we schedule our own packet to be sent */ |
| 43 | static unsigned long own_send_time(struct bat_priv *bat_priv) |
| 44 | { |
| 45 | return jiffies + msecs_to_jiffies( |
| 46 | atomic_read(&bat_priv->orig_interval) - |
| 47 | JITTER + (random32() % 2*JITTER)); |
| 48 | } |
| 49 | |
| 50 | /* when do we schedule a forwarded packet to be sent */ |
Simon Wunderlich | 74ef115 | 2010-12-29 16:15:19 +0000 | [diff] [blame] | 51 | static unsigned long forward_send_time(void) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 52 | { |
| 53 | return jiffies + msecs_to_jiffies(random32() % (JITTER/2)); |
| 54 | } |
| 55 | |
| 56 | /* send out an already prepared packet to the given address via the |
| 57 | * specified batman interface */ |
| 58 | int send_skb_packet(struct sk_buff *skb, |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 59 | struct hard_iface *hard_iface, |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 60 | uint8_t *dst_addr) |
| 61 | { |
| 62 | struct ethhdr *ethhdr; |
| 63 | |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 64 | if (hard_iface->if_status != IF_ACTIVE) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 65 | goto send_skb_err; |
| 66 | |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 67 | if (unlikely(!hard_iface->net_dev)) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 68 | goto send_skb_err; |
| 69 | |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 70 | if (!(hard_iface->net_dev->flags & IFF_UP)) { |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 71 | pr_warning("Interface %s is not up - can't send packet via " |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 72 | "that interface!\n", hard_iface->net_dev->name); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 73 | goto send_skb_err; |
| 74 | } |
| 75 | |
| 76 | /* push to the ethernet header. */ |
| 77 | if (my_skb_head_push(skb, sizeof(struct ethhdr)) < 0) |
| 78 | goto send_skb_err; |
| 79 | |
| 80 | skb_reset_mac_header(skb); |
| 81 | |
| 82 | ethhdr = (struct ethhdr *) skb_mac_header(skb); |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 83 | memcpy(ethhdr->h_source, hard_iface->net_dev->dev_addr, ETH_ALEN); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 84 | memcpy(ethhdr->h_dest, dst_addr, ETH_ALEN); |
| 85 | ethhdr->h_proto = __constant_htons(ETH_P_BATMAN); |
| 86 | |
| 87 | skb_set_network_header(skb, ETH_HLEN); |
| 88 | skb->priority = TC_PRIO_CONTROL; |
| 89 | skb->protocol = __constant_htons(ETH_P_BATMAN); |
| 90 | |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 91 | skb->dev = hard_iface->net_dev; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 92 | |
| 93 | /* dev_queue_xmit() returns a negative result on error. However on |
| 94 | * congestion and traffic shaping, it drops and returns NET_XMIT_DROP |
| 95 | * (which is > 0). This will not be treated as an error. */ |
| 96 | |
| 97 | return dev_queue_xmit(skb); |
| 98 | send_skb_err: |
| 99 | kfree_skb(skb); |
| 100 | return NET_XMIT_DROP; |
| 101 | } |
| 102 | |
| 103 | /* Send a packet to a given interface */ |
| 104 | static void send_packet_to_if(struct forw_packet *forw_packet, |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 105 | struct hard_iface *hard_iface) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 106 | { |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 107 | struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 108 | char *fwd_str; |
| 109 | uint8_t packet_num; |
| 110 | int16_t buff_pos; |
| 111 | struct batman_packet *batman_packet; |
| 112 | struct sk_buff *skb; |
| 113 | |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 114 | if (hard_iface->if_status != IF_ACTIVE) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 115 | return; |
| 116 | |
| 117 | packet_num = 0; |
| 118 | buff_pos = 0; |
| 119 | batman_packet = (struct batman_packet *)forw_packet->skb->data; |
| 120 | |
| 121 | /* adjust all flags and log packets */ |
| 122 | while (aggregated_packet(buff_pos, |
| 123 | forw_packet->packet_len, |
Antonio Quartulli | 2dafb49 | 2011-05-05 08:42:45 +0200 | [diff] [blame] | 124 | batman_packet->num_tt)) { |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 125 | |
| 126 | /* we might have aggregated direct link packets with an |
| 127 | * ordinary base packet */ |
| 128 | if ((forw_packet->direct_link_flags & (1 << packet_num)) && |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 129 | (forw_packet->if_incoming == hard_iface)) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 130 | batman_packet->flags |= DIRECTLINK; |
| 131 | else |
| 132 | batman_packet->flags &= ~DIRECTLINK; |
| 133 | |
| 134 | fwd_str = (packet_num > 0 ? "Forwarding" : (forw_packet->own ? |
| 135 | "Sending own" : |
| 136 | "Forwarding")); |
| 137 | bat_dbg(DBG_BATMAN, bat_priv, |
| 138 | "%s %spacket (originator %pM, seqno %d, TQ %d, TTL %d," |
| 139 | " IDF %s) on interface %s [%pM]\n", |
| 140 | fwd_str, (packet_num > 0 ? "aggregated " : ""), |
| 141 | batman_packet->orig, ntohl(batman_packet->seqno), |
| 142 | batman_packet->tq, batman_packet->ttl, |
| 143 | (batman_packet->flags & DIRECTLINK ? |
| 144 | "on" : "off"), |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 145 | hard_iface->net_dev->name, |
| 146 | hard_iface->net_dev->dev_addr); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 147 | |
| 148 | buff_pos += sizeof(struct batman_packet) + |
Antonio Quartulli | 2dafb49 | 2011-05-05 08:42:45 +0200 | [diff] [blame] | 149 | (batman_packet->num_tt * ETH_ALEN); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 150 | packet_num++; |
| 151 | batman_packet = (struct batman_packet *) |
| 152 | (forw_packet->skb->data + buff_pos); |
| 153 | } |
| 154 | |
| 155 | /* create clone because function is called more than once */ |
| 156 | skb = skb_clone(forw_packet->skb, GFP_ATOMIC); |
| 157 | if (skb) |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 158 | send_skb_packet(skb, hard_iface, broadcast_addr); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 159 | } |
| 160 | |
| 161 | /* send a batman packet */ |
| 162 | static void send_packet(struct forw_packet *forw_packet) |
| 163 | { |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 164 | struct hard_iface *hard_iface; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 165 | struct net_device *soft_iface; |
| 166 | struct bat_priv *bat_priv; |
| 167 | struct batman_packet *batman_packet = |
| 168 | (struct batman_packet *)(forw_packet->skb->data); |
| 169 | unsigned char directlink = (batman_packet->flags & DIRECTLINK ? 1 : 0); |
| 170 | |
| 171 | if (!forw_packet->if_incoming) { |
| 172 | pr_err("Error - can't forward packet: incoming iface not " |
| 173 | "specified\n"); |
| 174 | return; |
| 175 | } |
| 176 | |
| 177 | soft_iface = forw_packet->if_incoming->soft_iface; |
| 178 | bat_priv = netdev_priv(soft_iface); |
| 179 | |
| 180 | if (forw_packet->if_incoming->if_status != IF_ACTIVE) |
| 181 | return; |
| 182 | |
| 183 | /* multihomed peer assumed */ |
| 184 | /* non-primary OGMs are only broadcasted on their interface */ |
| 185 | if ((directlink && (batman_packet->ttl == 1)) || |
| 186 | (forw_packet->own && (forw_packet->if_incoming->if_num > 0))) { |
| 187 | |
| 188 | /* FIXME: what about aggregated packets ? */ |
| 189 | bat_dbg(DBG_BATMAN, bat_priv, |
| 190 | "%s packet (originator %pM, seqno %d, TTL %d) " |
| 191 | "on interface %s [%pM]\n", |
| 192 | (forw_packet->own ? "Sending own" : "Forwarding"), |
| 193 | batman_packet->orig, ntohl(batman_packet->seqno), |
| 194 | batman_packet->ttl, |
| 195 | forw_packet->if_incoming->net_dev->name, |
| 196 | forw_packet->if_incoming->net_dev->dev_addr); |
| 197 | |
| 198 | /* skb is only used once and than forw_packet is free'd */ |
| 199 | send_skb_packet(forw_packet->skb, forw_packet->if_incoming, |
| 200 | broadcast_addr); |
| 201 | forw_packet->skb = NULL; |
| 202 | |
| 203 | return; |
| 204 | } |
| 205 | |
| 206 | /* broadcast on every interface */ |
| 207 | rcu_read_lock(); |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 208 | list_for_each_entry_rcu(hard_iface, &hardif_list, list) { |
| 209 | if (hard_iface->soft_iface != soft_iface) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 210 | continue; |
| 211 | |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 212 | send_packet_to_if(forw_packet, hard_iface); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 213 | } |
| 214 | rcu_read_unlock(); |
| 215 | } |
| 216 | |
| 217 | static void rebuild_batman_packet(struct bat_priv *bat_priv, |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 218 | struct hard_iface *hard_iface) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 219 | { |
| 220 | int new_len; |
| 221 | unsigned char *new_buff; |
| 222 | struct batman_packet *batman_packet; |
| 223 | |
| 224 | new_len = sizeof(struct batman_packet) + |
Antonio Quartulli | 2dafb49 | 2011-05-05 08:42:45 +0200 | [diff] [blame] | 225 | (bat_priv->num_local_tt * ETH_ALEN); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 226 | new_buff = kmalloc(new_len, GFP_ATOMIC); |
| 227 | |
| 228 | /* keep old buffer if kmalloc should fail */ |
| 229 | if (new_buff) { |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 230 | memcpy(new_buff, hard_iface->packet_buff, |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 231 | sizeof(struct batman_packet)); |
| 232 | batman_packet = (struct batman_packet *)new_buff; |
| 233 | |
Antonio Quartulli | 2dafb49 | 2011-05-05 08:42:45 +0200 | [diff] [blame] | 234 | batman_packet->num_tt = tt_local_fill_buffer(bat_priv, |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 235 | new_buff + sizeof(struct batman_packet), |
| 236 | new_len - sizeof(struct batman_packet)); |
| 237 | |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 238 | kfree(hard_iface->packet_buff); |
| 239 | hard_iface->packet_buff = new_buff; |
| 240 | hard_iface->packet_len = new_len; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 241 | } |
| 242 | } |
| 243 | |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 244 | void schedule_own_packet(struct hard_iface *hard_iface) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 245 | { |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 246 | struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
Marek Lindner | 32ae9b2 | 2011-04-20 15:40:58 +0200 | [diff] [blame] | 247 | struct hard_iface *primary_if; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 248 | unsigned long send_time; |
| 249 | struct batman_packet *batman_packet; |
| 250 | int vis_server; |
| 251 | |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 252 | if ((hard_iface->if_status == IF_NOT_IN_USE) || |
| 253 | (hard_iface->if_status == IF_TO_BE_REMOVED)) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 254 | return; |
| 255 | |
| 256 | vis_server = atomic_read(&bat_priv->vis_mode); |
Marek Lindner | 32ae9b2 | 2011-04-20 15:40:58 +0200 | [diff] [blame] | 257 | primary_if = primary_if_get_selected(bat_priv); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 258 | |
| 259 | /** |
| 260 | * the interface gets activated here to avoid race conditions between |
| 261 | * the moment of activating the interface in |
| 262 | * hardif_activate_interface() where the originator mac is set and |
| 263 | * outdated packets (especially uninitialized mac addresses) in the |
| 264 | * packet queue |
| 265 | */ |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 266 | if (hard_iface->if_status == IF_TO_BE_ACTIVATED) |
| 267 | hard_iface->if_status = IF_ACTIVE; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 268 | |
Antonio Quartulli | 2dafb49 | 2011-05-05 08:42:45 +0200 | [diff] [blame] | 269 | /* if local tt has changed and interface is a primary interface */ |
| 270 | if ((atomic_read(&bat_priv->tt_local_changed)) && |
Marek Lindner | 32ae9b2 | 2011-04-20 15:40:58 +0200 | [diff] [blame] | 271 | (hard_iface == primary_if)) |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 272 | rebuild_batman_packet(bat_priv, hard_iface); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 273 | |
| 274 | /** |
| 275 | * NOTE: packet_buff might just have been re-allocated in |
| 276 | * rebuild_batman_packet() |
| 277 | */ |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 278 | batman_packet = (struct batman_packet *)hard_iface->packet_buff; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 279 | |
| 280 | /* change sequence number to network order */ |
| 281 | batman_packet->seqno = |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 282 | htonl((uint32_t)atomic_read(&hard_iface->seqno)); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 283 | |
| 284 | if (vis_server == VIS_TYPE_SERVER_SYNC) |
| 285 | batman_packet->flags |= VIS_SERVER; |
| 286 | else |
| 287 | batman_packet->flags &= ~VIS_SERVER; |
| 288 | |
Marek Lindner | 32ae9b2 | 2011-04-20 15:40:58 +0200 | [diff] [blame] | 289 | if ((hard_iface == primary_if) && |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 290 | (atomic_read(&bat_priv->gw_mode) == GW_MODE_SERVER)) |
| 291 | batman_packet->gw_flags = |
| 292 | (uint8_t)atomic_read(&bat_priv->gw_bandwidth); |
| 293 | else |
| 294 | batman_packet->gw_flags = 0; |
| 295 | |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 296 | atomic_inc(&hard_iface->seqno); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 297 | |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 298 | slide_own_bcast_window(hard_iface); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 299 | send_time = own_send_time(bat_priv); |
| 300 | add_bat_packet_to_list(bat_priv, |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 301 | hard_iface->packet_buff, |
| 302 | hard_iface->packet_len, |
| 303 | hard_iface, 1, send_time); |
Marek Lindner | 32ae9b2 | 2011-04-20 15:40:58 +0200 | [diff] [blame] | 304 | |
| 305 | if (primary_if) |
| 306 | hardif_free_ref(primary_if); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 307 | } |
| 308 | |
| 309 | void schedule_forward_packet(struct orig_node *orig_node, |
| 310 | struct ethhdr *ethhdr, |
| 311 | struct batman_packet *batman_packet, |
Antonio Quartulli | 2dafb49 | 2011-05-05 08:42:45 +0200 | [diff] [blame] | 312 | uint8_t directlink, int tt_buff_len, |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 313 | struct hard_iface *if_incoming) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 314 | { |
| 315 | struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
Linus Lüssing | e1a5382 | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 316 | struct neigh_node *router; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 317 | unsigned char in_tq, in_ttl, tq_avg = 0; |
| 318 | unsigned long send_time; |
| 319 | |
| 320 | if (batman_packet->ttl <= 1) { |
| 321 | bat_dbg(DBG_BATMAN, bat_priv, "ttl exceeded\n"); |
| 322 | return; |
| 323 | } |
| 324 | |
Linus Lüssing | e1a5382 | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 325 | router = orig_node_get_router(orig_node); |
| 326 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 327 | in_tq = batman_packet->tq; |
| 328 | in_ttl = batman_packet->ttl; |
| 329 | |
| 330 | batman_packet->ttl--; |
| 331 | memcpy(batman_packet->prev_sender, ethhdr->h_source, ETH_ALEN); |
| 332 | |
| 333 | /* rebroadcast tq of our best ranking neighbor to ensure the rebroadcast |
| 334 | * of our best tq value */ |
Linus Lüssing | e1a5382 | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 335 | if (router && router->tq_avg != 0) { |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 336 | |
| 337 | /* rebroadcast ogm of best ranking neighbor as is */ |
Linus Lüssing | e1a5382 | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 338 | if (!compare_eth(router->addr, ethhdr->h_source)) { |
| 339 | batman_packet->tq = router->tq_avg; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 340 | |
Linus Lüssing | e1a5382 | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 341 | if (router->last_ttl) |
| 342 | batman_packet->ttl = router->last_ttl - 1; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 343 | } |
| 344 | |
Linus Lüssing | e1a5382 | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 345 | tq_avg = router->tq_avg; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 346 | } |
| 347 | |
Linus Lüssing | e1a5382 | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 348 | if (router) |
| 349 | neigh_node_free_ref(router); |
| 350 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 351 | /* apply hop penalty */ |
| 352 | batman_packet->tq = hop_penalty(batman_packet->tq, bat_priv); |
| 353 | |
| 354 | bat_dbg(DBG_BATMAN, bat_priv, |
| 355 | "Forwarding packet: tq_orig: %i, tq_avg: %i, " |
| 356 | "tq_forw: %i, ttl_orig: %i, ttl_forw: %i\n", |
| 357 | in_tq, tq_avg, batman_packet->tq, in_ttl - 1, |
| 358 | batman_packet->ttl); |
| 359 | |
| 360 | batman_packet->seqno = htonl(batman_packet->seqno); |
| 361 | |
| 362 | /* switch of primaries first hop flag when forwarding */ |
| 363 | batman_packet->flags &= ~PRIMARIES_FIRST_HOP; |
| 364 | if (directlink) |
| 365 | batman_packet->flags |= DIRECTLINK; |
| 366 | else |
| 367 | batman_packet->flags &= ~DIRECTLINK; |
| 368 | |
Simon Wunderlich | 74ef115 | 2010-12-29 16:15:19 +0000 | [diff] [blame] | 369 | send_time = forward_send_time(); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 370 | add_bat_packet_to_list(bat_priv, |
| 371 | (unsigned char *)batman_packet, |
Antonio Quartulli | 2dafb49 | 2011-05-05 08:42:45 +0200 | [diff] [blame] | 372 | sizeof(struct batman_packet) + tt_buff_len, |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 373 | if_incoming, 0, send_time); |
| 374 | } |
| 375 | |
| 376 | static void forw_packet_free(struct forw_packet *forw_packet) |
| 377 | { |
| 378 | if (forw_packet->skb) |
| 379 | kfree_skb(forw_packet->skb); |
Sven Eckelmann | 6d5808d | 2011-05-11 20:59:06 +0200 | [diff] [blame] | 380 | if (forw_packet->if_incoming) |
| 381 | hardif_free_ref(forw_packet->if_incoming); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 382 | kfree(forw_packet); |
| 383 | } |
| 384 | |
| 385 | static void _add_bcast_packet_to_list(struct bat_priv *bat_priv, |
| 386 | struct forw_packet *forw_packet, |
| 387 | unsigned long send_time) |
| 388 | { |
| 389 | INIT_HLIST_NODE(&forw_packet->list); |
| 390 | |
| 391 | /* add new packet to packet list */ |
| 392 | spin_lock_bh(&bat_priv->forw_bcast_list_lock); |
| 393 | hlist_add_head(&forw_packet->list, &bat_priv->forw_bcast_list); |
| 394 | spin_unlock_bh(&bat_priv->forw_bcast_list_lock); |
| 395 | |
| 396 | /* start timer for this packet */ |
| 397 | INIT_DELAYED_WORK(&forw_packet->delayed_work, |
| 398 | send_outstanding_bcast_packet); |
| 399 | queue_delayed_work(bat_event_workqueue, &forw_packet->delayed_work, |
| 400 | send_time); |
| 401 | } |
| 402 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 403 | /* add a broadcast packet to the queue and setup timers. broadcast packets |
| 404 | * are sent multiple times to increase probability for beeing received. |
| 405 | * |
| 406 | * This function returns NETDEV_TX_OK on success and NETDEV_TX_BUSY on |
| 407 | * errors. |
| 408 | * |
| 409 | * The skb is not consumed, so the caller should make sure that the |
| 410 | * skb is freed. */ |
| 411 | int add_bcast_packet_to_list(struct bat_priv *bat_priv, struct sk_buff *skb) |
| 412 | { |
Marek Lindner | 32ae9b2 | 2011-04-20 15:40:58 +0200 | [diff] [blame] | 413 | struct hard_iface *primary_if = NULL; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 414 | struct forw_packet *forw_packet; |
| 415 | struct bcast_packet *bcast_packet; |
| 416 | |
| 417 | if (!atomic_dec_not_zero(&bat_priv->bcast_queue_left)) { |
| 418 | bat_dbg(DBG_BATMAN, bat_priv, "bcast packet queue full\n"); |
| 419 | goto out; |
| 420 | } |
| 421 | |
Marek Lindner | 32ae9b2 | 2011-04-20 15:40:58 +0200 | [diff] [blame] | 422 | primary_if = primary_if_get_selected(bat_priv); |
| 423 | if (!primary_if) |
Marek Lindner | ca06c6e | 2011-05-14 20:01:22 +0200 | [diff] [blame] | 424 | goto out_and_inc; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 425 | |
| 426 | forw_packet = kmalloc(sizeof(struct forw_packet), GFP_ATOMIC); |
| 427 | |
| 428 | if (!forw_packet) |
| 429 | goto out_and_inc; |
| 430 | |
| 431 | skb = skb_copy(skb, GFP_ATOMIC); |
| 432 | if (!skb) |
| 433 | goto packet_free; |
| 434 | |
| 435 | /* as we have a copy now, it is safe to decrease the TTL */ |
| 436 | bcast_packet = (struct bcast_packet *)skb->data; |
| 437 | bcast_packet->ttl--; |
| 438 | |
| 439 | skb_reset_mac_header(skb); |
| 440 | |
| 441 | forw_packet->skb = skb; |
Marek Lindner | 32ae9b2 | 2011-04-20 15:40:58 +0200 | [diff] [blame] | 442 | forw_packet->if_incoming = primary_if; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 443 | |
| 444 | /* how often did we send the bcast packet ? */ |
| 445 | forw_packet->num_packets = 0; |
| 446 | |
| 447 | _add_bcast_packet_to_list(bat_priv, forw_packet, 1); |
| 448 | return NETDEV_TX_OK; |
| 449 | |
| 450 | packet_free: |
| 451 | kfree(forw_packet); |
| 452 | out_and_inc: |
| 453 | atomic_inc(&bat_priv->bcast_queue_left); |
| 454 | out: |
Marek Lindner | 32ae9b2 | 2011-04-20 15:40:58 +0200 | [diff] [blame] | 455 | if (primary_if) |
| 456 | hardif_free_ref(primary_if); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 457 | return NETDEV_TX_BUSY; |
| 458 | } |
| 459 | |
| 460 | static void send_outstanding_bcast_packet(struct work_struct *work) |
| 461 | { |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 462 | struct hard_iface *hard_iface; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 463 | struct delayed_work *delayed_work = |
| 464 | container_of(work, struct delayed_work, work); |
| 465 | struct forw_packet *forw_packet = |
| 466 | container_of(delayed_work, struct forw_packet, delayed_work); |
| 467 | struct sk_buff *skb1; |
| 468 | struct net_device *soft_iface = forw_packet->if_incoming->soft_iface; |
| 469 | struct bat_priv *bat_priv = netdev_priv(soft_iface); |
| 470 | |
| 471 | spin_lock_bh(&bat_priv->forw_bcast_list_lock); |
| 472 | hlist_del(&forw_packet->list); |
| 473 | spin_unlock_bh(&bat_priv->forw_bcast_list_lock); |
| 474 | |
| 475 | if (atomic_read(&bat_priv->mesh_state) == MESH_DEACTIVATING) |
| 476 | goto out; |
| 477 | |
| 478 | /* rebroadcast packet */ |
| 479 | rcu_read_lock(); |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 480 | list_for_each_entry_rcu(hard_iface, &hardif_list, list) { |
| 481 | if (hard_iface->soft_iface != soft_iface) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 482 | continue; |
| 483 | |
| 484 | /* send a copy of the saved skb */ |
| 485 | skb1 = skb_clone(forw_packet->skb, GFP_ATOMIC); |
| 486 | if (skb1) |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 487 | send_skb_packet(skb1, hard_iface, broadcast_addr); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 488 | } |
| 489 | rcu_read_unlock(); |
| 490 | |
| 491 | forw_packet->num_packets++; |
| 492 | |
| 493 | /* if we still have some more bcasts to send */ |
| 494 | if (forw_packet->num_packets < 3) { |
| 495 | _add_bcast_packet_to_list(bat_priv, forw_packet, |
| 496 | ((5 * HZ) / 1000)); |
| 497 | return; |
| 498 | } |
| 499 | |
| 500 | out: |
| 501 | forw_packet_free(forw_packet); |
| 502 | atomic_inc(&bat_priv->bcast_queue_left); |
| 503 | } |
| 504 | |
| 505 | void send_outstanding_bat_packet(struct work_struct *work) |
| 506 | { |
| 507 | struct delayed_work *delayed_work = |
| 508 | container_of(work, struct delayed_work, work); |
| 509 | struct forw_packet *forw_packet = |
| 510 | container_of(delayed_work, struct forw_packet, delayed_work); |
| 511 | struct bat_priv *bat_priv; |
| 512 | |
| 513 | bat_priv = netdev_priv(forw_packet->if_incoming->soft_iface); |
| 514 | spin_lock_bh(&bat_priv->forw_bat_list_lock); |
| 515 | hlist_del(&forw_packet->list); |
| 516 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); |
| 517 | |
| 518 | if (atomic_read(&bat_priv->mesh_state) == MESH_DEACTIVATING) |
| 519 | goto out; |
| 520 | |
| 521 | send_packet(forw_packet); |
| 522 | |
| 523 | /** |
| 524 | * we have to have at least one packet in the queue |
| 525 | * to determine the queues wake up time unless we are |
| 526 | * shutting down |
| 527 | */ |
| 528 | if (forw_packet->own) |
| 529 | schedule_own_packet(forw_packet->if_incoming); |
| 530 | |
| 531 | out: |
| 532 | /* don't count own packet */ |
| 533 | if (!forw_packet->own) |
| 534 | atomic_inc(&bat_priv->batman_queue_left); |
| 535 | |
| 536 | forw_packet_free(forw_packet); |
| 537 | } |
| 538 | |
| 539 | void purge_outstanding_packets(struct bat_priv *bat_priv, |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 540 | struct hard_iface *hard_iface) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 541 | { |
| 542 | struct forw_packet *forw_packet; |
| 543 | struct hlist_node *tmp_node, *safe_tmp_node; |
Sven Eckelmann | 6d5808d | 2011-05-11 20:59:06 +0200 | [diff] [blame] | 544 | bool pending; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 545 | |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 546 | if (hard_iface) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 547 | bat_dbg(DBG_BATMAN, bat_priv, |
| 548 | "purge_outstanding_packets(): %s\n", |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 549 | hard_iface->net_dev->name); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 550 | else |
| 551 | bat_dbg(DBG_BATMAN, bat_priv, |
| 552 | "purge_outstanding_packets()\n"); |
| 553 | |
| 554 | /* free bcast list */ |
| 555 | spin_lock_bh(&bat_priv->forw_bcast_list_lock); |
| 556 | hlist_for_each_entry_safe(forw_packet, tmp_node, safe_tmp_node, |
| 557 | &bat_priv->forw_bcast_list, list) { |
| 558 | |
| 559 | /** |
| 560 | * if purge_outstanding_packets() was called with an argmument |
| 561 | * we delete only packets belonging to the given interface |
| 562 | */ |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 563 | if ((hard_iface) && |
| 564 | (forw_packet->if_incoming != hard_iface)) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 565 | continue; |
| 566 | |
| 567 | spin_unlock_bh(&bat_priv->forw_bcast_list_lock); |
| 568 | |
| 569 | /** |
| 570 | * send_outstanding_bcast_packet() will lock the list to |
| 571 | * delete the item from the list |
| 572 | */ |
Sven Eckelmann | 6d5808d | 2011-05-11 20:59:06 +0200 | [diff] [blame] | 573 | pending = cancel_delayed_work_sync(&forw_packet->delayed_work); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 574 | spin_lock_bh(&bat_priv->forw_bcast_list_lock); |
Sven Eckelmann | 6d5808d | 2011-05-11 20:59:06 +0200 | [diff] [blame] | 575 | |
| 576 | if (pending) { |
| 577 | hlist_del(&forw_packet->list); |
| 578 | forw_packet_free(forw_packet); |
| 579 | } |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 580 | } |
| 581 | spin_unlock_bh(&bat_priv->forw_bcast_list_lock); |
| 582 | |
| 583 | /* free batman packet list */ |
| 584 | spin_lock_bh(&bat_priv->forw_bat_list_lock); |
| 585 | hlist_for_each_entry_safe(forw_packet, tmp_node, safe_tmp_node, |
| 586 | &bat_priv->forw_bat_list, list) { |
| 587 | |
| 588 | /** |
| 589 | * if purge_outstanding_packets() was called with an argmument |
| 590 | * we delete only packets belonging to the given interface |
| 591 | */ |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 592 | if ((hard_iface) && |
| 593 | (forw_packet->if_incoming != hard_iface)) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 594 | continue; |
| 595 | |
| 596 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); |
| 597 | |
| 598 | /** |
| 599 | * send_outstanding_bat_packet() will lock the list to |
| 600 | * delete the item from the list |
| 601 | */ |
Sven Eckelmann | 6d5808d | 2011-05-11 20:59:06 +0200 | [diff] [blame] | 602 | pending = cancel_delayed_work_sync(&forw_packet->delayed_work); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 603 | spin_lock_bh(&bat_priv->forw_bat_list_lock); |
Sven Eckelmann | 6d5808d | 2011-05-11 20:59:06 +0200 | [diff] [blame] | 604 | |
| 605 | if (pending) { |
| 606 | hlist_del(&forw_packet->list); |
| 607 | forw_packet_free(forw_packet); |
| 608 | } |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 609 | } |
| 610 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); |
| 611 | } |