Antonio Quartulli | 0da0035 | 2016-01-16 16:40:12 +0800 | [diff] [blame] | 1 | /* Copyright (C) 2013-2016 B.A.T.M.A.N. contributors: |
| 2 | * |
| 3 | * Antonio Quartulli |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or |
| 6 | * modify it under the terms of version 2 of the GNU General Public |
| 7 | * License as published by the Free Software Foundation. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, but |
| 10 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 12 | * General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
| 16 | */ |
| 17 | |
| 18 | #include "bat_v_ogm.h" |
| 19 | #include "main.h" |
| 20 | |
| 21 | #include <linux/atomic.h> |
| 22 | #include <linux/byteorder/generic.h> |
| 23 | #include <linux/errno.h> |
| 24 | #include <linux/etherdevice.h> |
| 25 | #include <linux/fs.h> |
| 26 | #include <linux/if_ether.h> |
| 27 | #include <linux/jiffies.h> |
| 28 | #include <linux/kernel.h> |
Sven Eckelmann | 2735344 | 2016-03-05 16:09:16 +0100 | [diff] [blame] | 29 | #include <linux/kref.h> |
Antonio Quartulli | 9323158 | 2016-01-16 16:40:13 +0800 | [diff] [blame] | 30 | #include <linux/list.h> |
Sven Eckelmann | 5841c1b | 2020-03-16 23:31:03 +0100 | [diff] [blame] | 31 | #include <linux/lockdep.h> |
| 32 | #include <linux/mutex.h> |
Antonio Quartulli | 0da0035 | 2016-01-16 16:40:12 +0800 | [diff] [blame] | 33 | #include <linux/netdevice.h> |
| 34 | #include <linux/random.h> |
| 35 | #include <linux/rculist.h> |
| 36 | #include <linux/rcupdate.h> |
| 37 | #include <linux/skbuff.h> |
| 38 | #include <linux/slab.h> |
| 39 | #include <linux/stddef.h> |
| 40 | #include <linux/string.h> |
| 41 | #include <linux/types.h> |
| 42 | #include <linux/workqueue.h> |
| 43 | |
Sven Eckelmann | 01d350d | 2016-05-15 11:07:44 +0200 | [diff] [blame] | 44 | #include "bat_algo.h" |
Antonio Quartulli | 0da0035 | 2016-01-16 16:40:12 +0800 | [diff] [blame] | 45 | #include "hard-interface.h" |
Antonio Quartulli | 9323158 | 2016-01-16 16:40:13 +0800 | [diff] [blame] | 46 | #include "hash.h" |
Sven Eckelmann | ba41208 | 2016-05-15 23:48:31 +0200 | [diff] [blame] | 47 | #include "log.h" |
Antonio Quartulli | 9323158 | 2016-01-16 16:40:13 +0800 | [diff] [blame] | 48 | #include "originator.h" |
Antonio Quartulli | 0da0035 | 2016-01-16 16:40:12 +0800 | [diff] [blame] | 49 | #include "packet.h" |
| 50 | #include "routing.h" |
| 51 | #include "send.h" |
| 52 | #include "translation-table.h" |
Markus Pargmann | 1f8dce4 | 2016-05-15 11:07:43 +0200 | [diff] [blame] | 53 | #include "tvlv.h" |
Antonio Quartulli | 0da0035 | 2016-01-16 16:40:12 +0800 | [diff] [blame] | 54 | |
| 55 | /** |
Antonio Quartulli | 9323158 | 2016-01-16 16:40:13 +0800 | [diff] [blame] | 56 | * batadv_v_ogm_orig_get - retrieve and possibly create an originator node |
| 57 | * @bat_priv: the bat priv with all the soft interface information |
| 58 | * @addr: the address of the originator |
| 59 | * |
| 60 | * Return: the orig_node corresponding to the specified address. If such object |
| 61 | * does not exist it is allocated here. In case of allocation failure returns |
| 62 | * NULL. |
| 63 | */ |
| 64 | struct batadv_orig_node *batadv_v_ogm_orig_get(struct batadv_priv *bat_priv, |
| 65 | const u8 *addr) |
| 66 | { |
| 67 | struct batadv_orig_node *orig_node; |
| 68 | int hash_added; |
| 69 | |
| 70 | orig_node = batadv_orig_hash_find(bat_priv, addr); |
| 71 | if (orig_node) |
| 72 | return orig_node; |
| 73 | |
| 74 | orig_node = batadv_orig_node_new(bat_priv, addr); |
| 75 | if (!orig_node) |
| 76 | return NULL; |
| 77 | |
Sven Eckelmann | 55db2d5 | 2016-07-15 17:39:21 +0200 | [diff] [blame] | 78 | kref_get(&orig_node->refcount); |
Antonio Quartulli | 9323158 | 2016-01-16 16:40:13 +0800 | [diff] [blame] | 79 | hash_added = batadv_hash_add(bat_priv->orig_hash, batadv_compare_orig, |
| 80 | batadv_choose_orig, orig_node, |
| 81 | &orig_node->hash_entry); |
| 82 | if (hash_added != 0) { |
Sven Eckelmann | 55db2d5 | 2016-07-15 17:39:21 +0200 | [diff] [blame] | 83 | /* remove refcnt for newly created orig_node and hash entry */ |
Antonio Quartulli | 9323158 | 2016-01-16 16:40:13 +0800 | [diff] [blame] | 84 | batadv_orig_node_put(orig_node); |
| 85 | batadv_orig_node_put(orig_node); |
| 86 | orig_node = NULL; |
| 87 | } |
| 88 | |
| 89 | return orig_node; |
| 90 | } |
| 91 | |
| 92 | /** |
Antonio Quartulli | 0da0035 | 2016-01-16 16:40:12 +0800 | [diff] [blame] | 93 | * batadv_v_ogm_start_timer - restart the OGM sending timer |
| 94 | * @bat_priv: the bat priv with all the soft interface information |
| 95 | */ |
| 96 | static void batadv_v_ogm_start_timer(struct batadv_priv *bat_priv) |
| 97 | { |
| 98 | unsigned long msecs; |
| 99 | /* this function may be invoked in different contexts (ogm rescheduling |
| 100 | * or hard_iface activation), but the work timer should not be reset |
| 101 | */ |
| 102 | if (delayed_work_pending(&bat_priv->bat_v.ogm_wq)) |
| 103 | return; |
| 104 | |
| 105 | msecs = atomic_read(&bat_priv->orig_interval) - BATADV_JITTER; |
| 106 | msecs += prandom_u32() % (2 * BATADV_JITTER); |
| 107 | queue_delayed_work(batadv_event_workqueue, &bat_priv->bat_v.ogm_wq, |
| 108 | msecs_to_jiffies(msecs)); |
| 109 | } |
| 110 | |
| 111 | /** |
| 112 | * batadv_v_ogm_send_to_if - send a batman ogm using a given interface |
| 113 | * @skb: the OGM to send |
| 114 | * @hard_iface: the interface to use to send the OGM |
| 115 | */ |
| 116 | static void batadv_v_ogm_send_to_if(struct sk_buff *skb, |
| 117 | struct batadv_hard_iface *hard_iface) |
| 118 | { |
| 119 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
| 120 | |
| 121 | if (hard_iface->if_status != BATADV_IF_ACTIVE) |
| 122 | return; |
| 123 | |
| 124 | batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_TX); |
| 125 | batadv_add_counter(bat_priv, BATADV_CNT_MGMT_TX_BYTES, |
| 126 | skb->len + ETH_HLEN); |
| 127 | |
Antonio Quartulli | 95d3927 | 2016-01-16 16:40:15 +0800 | [diff] [blame] | 128 | batadv_send_broadcast_skb(skb, hard_iface); |
Antonio Quartulli | 0da0035 | 2016-01-16 16:40:12 +0800 | [diff] [blame] | 129 | } |
| 130 | |
| 131 | /** |
Sven Eckelmann | 5841c1b | 2020-03-16 23:31:03 +0100 | [diff] [blame] | 132 | * batadv_v_ogm_send_softif() - periodic worker broadcasting the own OGM |
| 133 | * @bat_priv: the bat priv with all the soft interface information |
Antonio Quartulli | 0da0035 | 2016-01-16 16:40:12 +0800 | [diff] [blame] | 134 | */ |
Sven Eckelmann | 5841c1b | 2020-03-16 23:31:03 +0100 | [diff] [blame] | 135 | static void batadv_v_ogm_send_softif(struct batadv_priv *bat_priv) |
Antonio Quartulli | 0da0035 | 2016-01-16 16:40:12 +0800 | [diff] [blame] | 136 | { |
| 137 | struct batadv_hard_iface *hard_iface; |
Antonio Quartulli | 0da0035 | 2016-01-16 16:40:12 +0800 | [diff] [blame] | 138 | struct batadv_ogm2_packet *ogm_packet; |
| 139 | struct sk_buff *skb, *skb_tmp; |
| 140 | unsigned char *ogm_buff, *pkt_buff; |
| 141 | int ogm_buff_len; |
| 142 | u16 tvlv_len = 0; |
| 143 | |
Sven Eckelmann | 5841c1b | 2020-03-16 23:31:03 +0100 | [diff] [blame] | 144 | lockdep_assert_held(&bat_priv->bat_v.ogm_buff_mutex); |
Antonio Quartulli | 0da0035 | 2016-01-16 16:40:12 +0800 | [diff] [blame] | 145 | |
| 146 | if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING) |
| 147 | goto out; |
| 148 | |
| 149 | ogm_buff = bat_priv->bat_v.ogm_buff; |
| 150 | ogm_buff_len = bat_priv->bat_v.ogm_buff_len; |
| 151 | /* tt changes have to be committed before the tvlv data is |
| 152 | * appended as it may alter the tt tvlv container |
| 153 | */ |
| 154 | batadv_tt_local_commit_changes(bat_priv); |
| 155 | tvlv_len = batadv_tvlv_container_ogm_append(bat_priv, &ogm_buff, |
| 156 | &ogm_buff_len, |
| 157 | BATADV_OGM2_HLEN); |
| 158 | |
| 159 | bat_priv->bat_v.ogm_buff = ogm_buff; |
| 160 | bat_priv->bat_v.ogm_buff_len = ogm_buff_len; |
| 161 | |
| 162 | skb = netdev_alloc_skb_ip_align(NULL, ETH_HLEN + ogm_buff_len); |
| 163 | if (!skb) |
| 164 | goto reschedule; |
| 165 | |
| 166 | skb_reserve(skb, ETH_HLEN); |
| 167 | pkt_buff = skb_put(skb, ogm_buff_len); |
| 168 | memcpy(pkt_buff, ogm_buff, ogm_buff_len); |
| 169 | |
| 170 | ogm_packet = (struct batadv_ogm2_packet *)skb->data; |
| 171 | ogm_packet->seqno = htonl(atomic_read(&bat_priv->bat_v.ogm_seqno)); |
| 172 | atomic_inc(&bat_priv->bat_v.ogm_seqno); |
| 173 | ogm_packet->tvlv_len = htons(tvlv_len); |
| 174 | |
| 175 | /* broadcast on every interface */ |
| 176 | rcu_read_lock(); |
| 177 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
| 178 | if (hard_iface->soft_iface != bat_priv->soft_iface) |
| 179 | continue; |
| 180 | |
Sven Eckelmann | 2735344 | 2016-03-05 16:09:16 +0100 | [diff] [blame] | 181 | if (!kref_get_unless_zero(&hard_iface->refcount)) |
| 182 | continue; |
| 183 | |
Antonio Quartulli | 0da0035 | 2016-01-16 16:40:12 +0800 | [diff] [blame] | 184 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| 185 | "Sending own OGM2 packet (originator %pM, seqno %u, throughput %u, TTL %d) on interface %s [%pM]\n", |
| 186 | ogm_packet->orig, ntohl(ogm_packet->seqno), |
| 187 | ntohl(ogm_packet->throughput), ogm_packet->ttl, |
| 188 | hard_iface->net_dev->name, |
| 189 | hard_iface->net_dev->dev_addr); |
| 190 | |
| 191 | /* this skb gets consumed by batadv_v_ogm_send_to_if() */ |
| 192 | skb_tmp = skb_clone(skb, GFP_ATOMIC); |
Sven Eckelmann | 2735344 | 2016-03-05 16:09:16 +0100 | [diff] [blame] | 193 | if (!skb_tmp) { |
| 194 | batadv_hardif_put(hard_iface); |
Antonio Quartulli | 0da0035 | 2016-01-16 16:40:12 +0800 | [diff] [blame] | 195 | break; |
Sven Eckelmann | 2735344 | 2016-03-05 16:09:16 +0100 | [diff] [blame] | 196 | } |
Antonio Quartulli | 0da0035 | 2016-01-16 16:40:12 +0800 | [diff] [blame] | 197 | |
| 198 | batadv_v_ogm_send_to_if(skb_tmp, hard_iface); |
Sven Eckelmann | 2735344 | 2016-03-05 16:09:16 +0100 | [diff] [blame] | 199 | batadv_hardif_put(hard_iface); |
Antonio Quartulli | 0da0035 | 2016-01-16 16:40:12 +0800 | [diff] [blame] | 200 | } |
| 201 | rcu_read_unlock(); |
| 202 | |
| 203 | consume_skb(skb); |
| 204 | |
| 205 | reschedule: |
| 206 | batadv_v_ogm_start_timer(bat_priv); |
| 207 | out: |
| 208 | return; |
| 209 | } |
| 210 | |
| 211 | /** |
Sven Eckelmann | 5841c1b | 2020-03-16 23:31:03 +0100 | [diff] [blame] | 212 | * batadv_v_ogm_send() - periodic worker broadcasting the own OGM |
| 213 | * @work: work queue item |
| 214 | */ |
| 215 | static void batadv_v_ogm_send(struct work_struct *work) |
| 216 | { |
| 217 | struct batadv_priv_bat_v *bat_v; |
| 218 | struct batadv_priv *bat_priv; |
| 219 | |
| 220 | bat_v = container_of(work, struct batadv_priv_bat_v, ogm_wq.work); |
| 221 | bat_priv = container_of(bat_v, struct batadv_priv, bat_v); |
| 222 | |
| 223 | mutex_lock(&bat_priv->bat_v.ogm_buff_mutex); |
| 224 | batadv_v_ogm_send_softif(bat_priv); |
| 225 | mutex_unlock(&bat_priv->bat_v.ogm_buff_mutex); |
| 226 | } |
| 227 | |
| 228 | /** |
Antonio Quartulli | 0da0035 | 2016-01-16 16:40:12 +0800 | [diff] [blame] | 229 | * batadv_v_ogm_iface_enable - prepare an interface for B.A.T.M.A.N. V |
| 230 | * @hard_iface: the interface to prepare |
| 231 | * |
| 232 | * Takes care of scheduling own OGM sending routine for this interface. |
| 233 | * |
| 234 | * Return: 0 on success or a negative error code otherwise |
| 235 | */ |
| 236 | int batadv_v_ogm_iface_enable(struct batadv_hard_iface *hard_iface) |
| 237 | { |
| 238 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
| 239 | |
| 240 | batadv_v_ogm_start_timer(bat_priv); |
| 241 | |
| 242 | return 0; |
| 243 | } |
| 244 | |
| 245 | /** |
| 246 | * batadv_v_ogm_primary_iface_set - set a new primary interface |
| 247 | * @primary_iface: the new primary interface |
| 248 | */ |
| 249 | void batadv_v_ogm_primary_iface_set(struct batadv_hard_iface *primary_iface) |
| 250 | { |
| 251 | struct batadv_priv *bat_priv = netdev_priv(primary_iface->soft_iface); |
| 252 | struct batadv_ogm2_packet *ogm_packet; |
| 253 | |
Sven Eckelmann | 5841c1b | 2020-03-16 23:31:03 +0100 | [diff] [blame] | 254 | mutex_lock(&bat_priv->bat_v.ogm_buff_mutex); |
Antonio Quartulli | 0da0035 | 2016-01-16 16:40:12 +0800 | [diff] [blame] | 255 | if (!bat_priv->bat_v.ogm_buff) |
Sven Eckelmann | 5841c1b | 2020-03-16 23:31:03 +0100 | [diff] [blame] | 256 | goto unlock; |
Antonio Quartulli | 0da0035 | 2016-01-16 16:40:12 +0800 | [diff] [blame] | 257 | |
| 258 | ogm_packet = (struct batadv_ogm2_packet *)bat_priv->bat_v.ogm_buff; |
| 259 | ether_addr_copy(ogm_packet->orig, primary_iface->net_dev->dev_addr); |
Sven Eckelmann | 5841c1b | 2020-03-16 23:31:03 +0100 | [diff] [blame] | 260 | |
| 261 | unlock: |
| 262 | mutex_unlock(&bat_priv->bat_v.ogm_buff_mutex); |
Antonio Quartulli | 0da0035 | 2016-01-16 16:40:12 +0800 | [diff] [blame] | 263 | } |
| 264 | |
| 265 | /** |
Antonio Quartulli | 9323158 | 2016-01-16 16:40:13 +0800 | [diff] [blame] | 266 | * batadv_v_forward_penalty - apply a penalty to the throughput metric forwarded |
| 267 | * with B.A.T.M.A.N. V OGMs |
| 268 | * @bat_priv: the bat priv with all the soft interface information |
| 269 | * @if_incoming: the interface where the OGM has been received |
| 270 | * @if_outgoing: the interface where the OGM has to be forwarded to |
| 271 | * @throughput: the current throughput |
| 272 | * |
| 273 | * Apply a penalty on the current throughput metric value based on the |
| 274 | * characteristic of the interface where the OGM has been received. The return |
| 275 | * value is computed as follows: |
| 276 | * - throughput * 50% if the incoming and outgoing interface are the |
| 277 | * same WiFi interface and the throughput is above |
| 278 | * 1MBit/s |
| 279 | * - throughput if the outgoing interface is the default |
| 280 | * interface (i.e. this OGM is processed for the |
| 281 | * internal table and not forwarded) |
| 282 | * - throughput * hop penalty otherwise |
| 283 | * |
| 284 | * Return: the penalised throughput metric. |
| 285 | */ |
| 286 | static u32 batadv_v_forward_penalty(struct batadv_priv *bat_priv, |
| 287 | struct batadv_hard_iface *if_incoming, |
| 288 | struct batadv_hard_iface *if_outgoing, |
| 289 | u32 throughput) |
| 290 | { |
| 291 | int hop_penalty = atomic_read(&bat_priv->hop_penalty); |
| 292 | int hop_penalty_max = BATADV_TQ_MAX_VALUE; |
| 293 | |
| 294 | /* Don't apply hop penalty in default originator table. */ |
| 295 | if (if_outgoing == BATADV_IF_DEFAULT) |
| 296 | return throughput; |
| 297 | |
| 298 | /* Forwarding on the same WiFi interface cuts the throughput in half |
| 299 | * due to the store & forward characteristics of WIFI. |
| 300 | * Very low throughput values are the exception. |
| 301 | */ |
| 302 | if ((throughput > 10) && |
| 303 | (if_incoming == if_outgoing) && |
Antonio Quartulli | c833484 | 2015-11-10 18:50:51 +0100 | [diff] [blame] | 304 | !(if_incoming->bat_v.flags & BATADV_FULL_DUPLEX)) |
Antonio Quartulli | 9323158 | 2016-01-16 16:40:13 +0800 | [diff] [blame] | 305 | return throughput / 2; |
| 306 | |
| 307 | /* hop penalty of 255 equals 100% */ |
| 308 | return throughput * (hop_penalty_max - hop_penalty) / hop_penalty_max; |
| 309 | } |
| 310 | |
| 311 | /** |
Simon Wunderlich | efcc9d3 | 2016-02-01 15:21:37 +0100 | [diff] [blame] | 312 | * batadv_v_ogm_forward - check conditions and forward an OGM to the given |
| 313 | * outgoing interface |
Antonio Quartulli | 9323158 | 2016-01-16 16:40:13 +0800 | [diff] [blame] | 314 | * @bat_priv: the bat priv with all the soft interface information |
| 315 | * @ogm_received: previously received OGM to be forwarded |
Simon Wunderlich | efcc9d3 | 2016-02-01 15:21:37 +0100 | [diff] [blame] | 316 | * @orig_node: the originator which has been updated |
| 317 | * @neigh_node: the neigh_node through with the OGM has been received |
Antonio Quartulli | 9323158 | 2016-01-16 16:40:13 +0800 | [diff] [blame] | 318 | * @if_incoming: the interface on which this OGM was received on |
| 319 | * @if_outgoing: the interface to which the OGM has to be forwarded to |
| 320 | * |
| 321 | * Forward an OGM to an interface after having altered the throughput metric and |
| 322 | * the TTL value contained in it. The original OGM isn't modified. |
| 323 | */ |
| 324 | static void batadv_v_ogm_forward(struct batadv_priv *bat_priv, |
| 325 | const struct batadv_ogm2_packet *ogm_received, |
Simon Wunderlich | efcc9d3 | 2016-02-01 15:21:37 +0100 | [diff] [blame] | 326 | struct batadv_orig_node *orig_node, |
| 327 | struct batadv_neigh_node *neigh_node, |
Antonio Quartulli | 9323158 | 2016-01-16 16:40:13 +0800 | [diff] [blame] | 328 | struct batadv_hard_iface *if_incoming, |
| 329 | struct batadv_hard_iface *if_outgoing) |
| 330 | { |
Simon Wunderlich | efcc9d3 | 2016-02-01 15:21:37 +0100 | [diff] [blame] | 331 | struct batadv_neigh_ifinfo *neigh_ifinfo = NULL; |
| 332 | struct batadv_orig_ifinfo *orig_ifinfo = NULL; |
| 333 | struct batadv_neigh_node *router = NULL; |
Antonio Quartulli | 9323158 | 2016-01-16 16:40:13 +0800 | [diff] [blame] | 334 | struct batadv_ogm2_packet *ogm_forward; |
| 335 | unsigned char *skb_buff; |
| 336 | struct sk_buff *skb; |
| 337 | size_t packet_len; |
| 338 | u16 tvlv_len; |
| 339 | |
Simon Wunderlich | efcc9d3 | 2016-02-01 15:21:37 +0100 | [diff] [blame] | 340 | /* only forward for specific interfaces, not for the default one. */ |
| 341 | if (if_outgoing == BATADV_IF_DEFAULT) |
| 342 | goto out; |
| 343 | |
| 344 | orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing); |
| 345 | if (!orig_ifinfo) |
| 346 | goto out; |
| 347 | |
| 348 | /* acquire possibly updated router */ |
| 349 | router = batadv_orig_router_get(orig_node, if_outgoing); |
| 350 | |
| 351 | /* strict rule: forward packets coming from the best next hop only */ |
| 352 | if (neigh_node != router) |
| 353 | goto out; |
| 354 | |
| 355 | /* don't forward the same seqno twice on one interface */ |
| 356 | if (orig_ifinfo->last_seqno_forwarded == ntohl(ogm_received->seqno)) |
| 357 | goto out; |
| 358 | |
| 359 | orig_ifinfo->last_seqno_forwarded = ntohl(ogm_received->seqno); |
| 360 | |
Antonio Quartulli | 9323158 | 2016-01-16 16:40:13 +0800 | [diff] [blame] | 361 | if (ogm_received->ttl <= 1) { |
| 362 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "ttl exceeded\n"); |
Simon Wunderlich | efcc9d3 | 2016-02-01 15:21:37 +0100 | [diff] [blame] | 363 | goto out; |
Antonio Quartulli | 9323158 | 2016-01-16 16:40:13 +0800 | [diff] [blame] | 364 | } |
| 365 | |
Simon Wunderlich | efcc9d3 | 2016-02-01 15:21:37 +0100 | [diff] [blame] | 366 | neigh_ifinfo = batadv_neigh_ifinfo_get(neigh_node, if_outgoing); |
| 367 | if (!neigh_ifinfo) |
| 368 | goto out; |
| 369 | |
Antonio Quartulli | 9323158 | 2016-01-16 16:40:13 +0800 | [diff] [blame] | 370 | tvlv_len = ntohs(ogm_received->tvlv_len); |
| 371 | |
| 372 | packet_len = BATADV_OGM2_HLEN + tvlv_len; |
| 373 | skb = netdev_alloc_skb_ip_align(if_outgoing->net_dev, |
| 374 | ETH_HLEN + packet_len); |
| 375 | if (!skb) |
Simon Wunderlich | efcc9d3 | 2016-02-01 15:21:37 +0100 | [diff] [blame] | 376 | goto out; |
Antonio Quartulli | 9323158 | 2016-01-16 16:40:13 +0800 | [diff] [blame] | 377 | |
| 378 | skb_reserve(skb, ETH_HLEN); |
| 379 | skb_buff = skb_put(skb, packet_len); |
| 380 | memcpy(skb_buff, ogm_received, packet_len); |
| 381 | |
| 382 | /* apply forward penalty */ |
| 383 | ogm_forward = (struct batadv_ogm2_packet *)skb_buff; |
Simon Wunderlich | efcc9d3 | 2016-02-01 15:21:37 +0100 | [diff] [blame] | 384 | ogm_forward->throughput = htonl(neigh_ifinfo->bat_v.throughput); |
Antonio Quartulli | 9323158 | 2016-01-16 16:40:13 +0800 | [diff] [blame] | 385 | ogm_forward->ttl--; |
| 386 | |
| 387 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| 388 | "Forwarding OGM2 packet on %s: throughput %u, ttl %u, received via %s\n", |
Simon Wunderlich | efcc9d3 | 2016-02-01 15:21:37 +0100 | [diff] [blame] | 389 | if_outgoing->net_dev->name, ntohl(ogm_forward->throughput), |
| 390 | ogm_forward->ttl, if_incoming->net_dev->name); |
Antonio Quartulli | 9323158 | 2016-01-16 16:40:13 +0800 | [diff] [blame] | 391 | |
| 392 | batadv_v_ogm_send_to_if(skb, if_outgoing); |
Simon Wunderlich | efcc9d3 | 2016-02-01 15:21:37 +0100 | [diff] [blame] | 393 | |
| 394 | out: |
| 395 | if (orig_ifinfo) |
| 396 | batadv_orig_ifinfo_put(orig_ifinfo); |
| 397 | if (router) |
| 398 | batadv_neigh_node_put(router); |
| 399 | if (neigh_ifinfo) |
| 400 | batadv_neigh_ifinfo_put(neigh_ifinfo); |
Antonio Quartulli | 9323158 | 2016-01-16 16:40:13 +0800 | [diff] [blame] | 401 | } |
| 402 | |
| 403 | /** |
| 404 | * batadv_v_ogm_metric_update - update route metric based on OGM |
| 405 | * @bat_priv: the bat priv with all the soft interface information |
| 406 | * @ogm2: OGM2 structure |
| 407 | * @orig_node: Originator structure for which the OGM has been received |
| 408 | * @neigh_node: the neigh_node through with the OGM has been received |
| 409 | * @if_incoming: the interface where this packet was received |
| 410 | * @if_outgoing: the interface for which the packet should be considered |
| 411 | * |
| 412 | * Return: |
| 413 | * 1 if the OGM is new, |
| 414 | * 0 if it is not new but valid, |
| 415 | * <0 on error (e.g. old OGM) |
| 416 | */ |
| 417 | static int batadv_v_ogm_metric_update(struct batadv_priv *bat_priv, |
| 418 | const struct batadv_ogm2_packet *ogm2, |
| 419 | struct batadv_orig_node *orig_node, |
| 420 | struct batadv_neigh_node *neigh_node, |
| 421 | struct batadv_hard_iface *if_incoming, |
| 422 | struct batadv_hard_iface *if_outgoing) |
| 423 | { |
| 424 | struct batadv_orig_ifinfo *orig_ifinfo = NULL; |
| 425 | struct batadv_neigh_ifinfo *neigh_ifinfo = NULL; |
| 426 | bool protection_started = false; |
| 427 | int ret = -EINVAL; |
| 428 | u32 path_throughput; |
| 429 | s32 seq_diff; |
| 430 | |
| 431 | orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing); |
| 432 | if (!orig_ifinfo) |
| 433 | goto out; |
| 434 | |
| 435 | seq_diff = ntohl(ogm2->seqno) - orig_ifinfo->last_real_seqno; |
| 436 | |
| 437 | if (!hlist_empty(&orig_node->neigh_list) && |
| 438 | batadv_window_protected(bat_priv, seq_diff, |
| 439 | BATADV_OGM_MAX_AGE, |
| 440 | &orig_ifinfo->batman_seqno_reset, |
| 441 | &protection_started)) { |
| 442 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| 443 | "Drop packet: packet within window protection time from %pM\n", |
| 444 | ogm2->orig); |
| 445 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| 446 | "Last reset: %ld, %ld\n", |
| 447 | orig_ifinfo->batman_seqno_reset, jiffies); |
| 448 | goto out; |
| 449 | } |
| 450 | |
| 451 | /* drop packets with old seqnos, however accept the first packet after |
| 452 | * a host has been rebooted. |
| 453 | */ |
| 454 | if ((seq_diff < 0) && !protection_started) |
| 455 | goto out; |
| 456 | |
| 457 | neigh_node->last_seen = jiffies; |
| 458 | |
| 459 | orig_node->last_seen = jiffies; |
| 460 | |
| 461 | orig_ifinfo->last_real_seqno = ntohl(ogm2->seqno); |
| 462 | orig_ifinfo->last_ttl = ogm2->ttl; |
| 463 | |
| 464 | neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing); |
| 465 | if (!neigh_ifinfo) |
| 466 | goto out; |
| 467 | |
| 468 | path_throughput = batadv_v_forward_penalty(bat_priv, if_incoming, |
| 469 | if_outgoing, |
| 470 | ntohl(ogm2->throughput)); |
| 471 | neigh_ifinfo->bat_v.throughput = path_throughput; |
| 472 | neigh_ifinfo->bat_v.last_seqno = ntohl(ogm2->seqno); |
| 473 | neigh_ifinfo->last_ttl = ogm2->ttl; |
| 474 | |
| 475 | if (seq_diff > 0 || protection_started) |
| 476 | ret = 1; |
| 477 | else |
| 478 | ret = 0; |
| 479 | out: |
| 480 | if (orig_ifinfo) |
| 481 | batadv_orig_ifinfo_put(orig_ifinfo); |
| 482 | if (neigh_ifinfo) |
| 483 | batadv_neigh_ifinfo_put(neigh_ifinfo); |
| 484 | |
| 485 | return ret; |
| 486 | } |
| 487 | |
| 488 | /** |
| 489 | * batadv_v_ogm_route_update - update routes based on OGM |
| 490 | * @bat_priv: the bat priv with all the soft interface information |
| 491 | * @ethhdr: the Ethernet header of the OGM2 |
| 492 | * @ogm2: OGM2 structure |
| 493 | * @orig_node: Originator structure for which the OGM has been received |
| 494 | * @neigh_node: the neigh_node through with the OGM has been received |
| 495 | * @if_incoming: the interface where this packet was received |
| 496 | * @if_outgoing: the interface for which the packet should be considered |
Simon Wunderlich | efcc9d3 | 2016-02-01 15:21:37 +0100 | [diff] [blame] | 497 | * |
| 498 | * Return: true if the packet should be forwarded, false otherwise |
Antonio Quartulli | 9323158 | 2016-01-16 16:40:13 +0800 | [diff] [blame] | 499 | */ |
Simon Wunderlich | efcc9d3 | 2016-02-01 15:21:37 +0100 | [diff] [blame] | 500 | static bool batadv_v_ogm_route_update(struct batadv_priv *bat_priv, |
Antonio Quartulli | 9323158 | 2016-01-16 16:40:13 +0800 | [diff] [blame] | 501 | const struct ethhdr *ethhdr, |
| 502 | const struct batadv_ogm2_packet *ogm2, |
| 503 | struct batadv_orig_node *orig_node, |
| 504 | struct batadv_neigh_node *neigh_node, |
| 505 | struct batadv_hard_iface *if_incoming, |
| 506 | struct batadv_hard_iface *if_outgoing) |
| 507 | { |
| 508 | struct batadv_neigh_node *router = NULL; |
Antonio Quartulli | 9323158 | 2016-01-16 16:40:13 +0800 | [diff] [blame] | 509 | struct batadv_orig_node *orig_neigh_node = NULL; |
Antonio Quartulli | 9323158 | 2016-01-16 16:40:13 +0800 | [diff] [blame] | 510 | struct batadv_neigh_node *orig_neigh_router = NULL; |
Simon Wunderlich | 86de37c | 2016-02-01 15:21:38 +0100 | [diff] [blame] | 511 | struct batadv_neigh_ifinfo *router_ifinfo = NULL, *neigh_ifinfo = NULL; |
| 512 | u32 router_throughput, neigh_throughput; |
| 513 | u32 router_last_seqno; |
| 514 | u32 neigh_last_seqno; |
| 515 | s32 neigh_seq_diff; |
Simon Wunderlich | efcc9d3 | 2016-02-01 15:21:37 +0100 | [diff] [blame] | 516 | bool forward = false; |
Antonio Quartulli | 9323158 | 2016-01-16 16:40:13 +0800 | [diff] [blame] | 517 | |
| 518 | orig_neigh_node = batadv_v_ogm_orig_get(bat_priv, ethhdr->h_source); |
| 519 | if (!orig_neigh_node) |
| 520 | goto out; |
| 521 | |
| 522 | orig_neigh_router = batadv_orig_router_get(orig_neigh_node, |
| 523 | if_outgoing); |
| 524 | |
| 525 | /* drop packet if sender is not a direct neighbor and if we |
| 526 | * don't route towards it |
| 527 | */ |
| 528 | router = batadv_orig_router_get(orig_node, if_outgoing); |
| 529 | if (router && router->orig_node != orig_node && !orig_neigh_router) { |
| 530 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| 531 | "Drop packet: OGM via unknown neighbor!\n"); |
| 532 | goto out; |
| 533 | } |
| 534 | |
Simon Wunderlich | 86de37c | 2016-02-01 15:21:38 +0100 | [diff] [blame] | 535 | /* Mark the OGM to be considered for forwarding, and update routes |
| 536 | * if needed. |
| 537 | */ |
Simon Wunderlich | efcc9d3 | 2016-02-01 15:21:37 +0100 | [diff] [blame] | 538 | forward = true; |
Simon Wunderlich | 86de37c | 2016-02-01 15:21:38 +0100 | [diff] [blame] | 539 | |
| 540 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| 541 | "Searching and updating originator entry of received packet\n"); |
| 542 | |
| 543 | /* if this neighbor already is our next hop there is nothing |
| 544 | * to change |
| 545 | */ |
| 546 | if (router == neigh_node) |
| 547 | goto out; |
| 548 | |
| 549 | /* don't consider neighbours with worse throughput. |
| 550 | * also switch route if this seqno is BATADV_V_MAX_ORIGDIFF newer than |
| 551 | * the last received seqno from our best next hop. |
| 552 | */ |
| 553 | if (router) { |
| 554 | router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing); |
| 555 | neigh_ifinfo = batadv_neigh_ifinfo_get(neigh_node, if_outgoing); |
| 556 | |
| 557 | /* if these are not allocated, something is wrong. */ |
| 558 | if (!router_ifinfo || !neigh_ifinfo) |
| 559 | goto out; |
| 560 | |
| 561 | neigh_last_seqno = neigh_ifinfo->bat_v.last_seqno; |
| 562 | router_last_seqno = router_ifinfo->bat_v.last_seqno; |
| 563 | neigh_seq_diff = neigh_last_seqno - router_last_seqno; |
| 564 | router_throughput = router_ifinfo->bat_v.throughput; |
| 565 | neigh_throughput = neigh_ifinfo->bat_v.throughput; |
| 566 | |
| 567 | if ((neigh_seq_diff < BATADV_OGM_MAX_ORIGDIFF) && |
| 568 | (router_throughput >= neigh_throughput)) |
| 569 | goto out; |
| 570 | } |
| 571 | |
| 572 | batadv_update_route(bat_priv, orig_node, if_outgoing, neigh_node); |
Antonio Quartulli | 9323158 | 2016-01-16 16:40:13 +0800 | [diff] [blame] | 573 | out: |
Antonio Quartulli | 9323158 | 2016-01-16 16:40:13 +0800 | [diff] [blame] | 574 | if (router) |
| 575 | batadv_neigh_node_put(router); |
| 576 | if (orig_neigh_router) |
| 577 | batadv_neigh_node_put(orig_neigh_router); |
| 578 | if (orig_neigh_node) |
| 579 | batadv_orig_node_put(orig_neigh_node); |
Simon Wunderlich | 86de37c | 2016-02-01 15:21:38 +0100 | [diff] [blame] | 580 | if (router_ifinfo) |
| 581 | batadv_neigh_ifinfo_put(router_ifinfo); |
| 582 | if (neigh_ifinfo) |
| 583 | batadv_neigh_ifinfo_put(neigh_ifinfo); |
Simon Wunderlich | efcc9d3 | 2016-02-01 15:21:37 +0100 | [diff] [blame] | 584 | |
| 585 | return forward; |
Antonio Quartulli | 9323158 | 2016-01-16 16:40:13 +0800 | [diff] [blame] | 586 | } |
| 587 | |
| 588 | /** |
| 589 | * batadv_v_ogm_process_per_outif - process a batman v OGM for an outgoing if |
| 590 | * @bat_priv: the bat priv with all the soft interface information |
| 591 | * @ethhdr: the Ethernet header of the OGM2 |
| 592 | * @ogm2: OGM2 structure |
| 593 | * @orig_node: Originator structure for which the OGM has been received |
| 594 | * @neigh_node: the neigh_node through with the OGM has been received |
| 595 | * @if_incoming: the interface where this packet was received |
| 596 | * @if_outgoing: the interface for which the packet should be considered |
| 597 | */ |
| 598 | static void |
| 599 | batadv_v_ogm_process_per_outif(struct batadv_priv *bat_priv, |
| 600 | const struct ethhdr *ethhdr, |
| 601 | const struct batadv_ogm2_packet *ogm2, |
| 602 | struct batadv_orig_node *orig_node, |
| 603 | struct batadv_neigh_node *neigh_node, |
| 604 | struct batadv_hard_iface *if_incoming, |
| 605 | struct batadv_hard_iface *if_outgoing) |
| 606 | { |
| 607 | int seqno_age; |
Simon Wunderlich | efcc9d3 | 2016-02-01 15:21:37 +0100 | [diff] [blame] | 608 | bool forward; |
Antonio Quartulli | 9323158 | 2016-01-16 16:40:13 +0800 | [diff] [blame] | 609 | |
| 610 | /* first, update the metric with according sanity checks */ |
| 611 | seqno_age = batadv_v_ogm_metric_update(bat_priv, ogm2, orig_node, |
| 612 | neigh_node, if_incoming, |
| 613 | if_outgoing); |
| 614 | |
| 615 | /* outdated sequence numbers are to be discarded */ |
| 616 | if (seqno_age < 0) |
| 617 | return; |
| 618 | |
| 619 | /* only unknown & newer OGMs contain TVLVs we are interested in */ |
| 620 | if ((seqno_age > 0) && (if_outgoing == BATADV_IF_DEFAULT)) |
| 621 | batadv_tvlv_containers_process(bat_priv, true, orig_node, |
| 622 | NULL, NULL, |
| 623 | (unsigned char *)(ogm2 + 1), |
| 624 | ntohs(ogm2->tvlv_len)); |
| 625 | |
| 626 | /* if the metric update went through, update routes if needed */ |
Simon Wunderlich | efcc9d3 | 2016-02-01 15:21:37 +0100 | [diff] [blame] | 627 | forward = batadv_v_ogm_route_update(bat_priv, ethhdr, ogm2, orig_node, |
| 628 | neigh_node, if_incoming, |
| 629 | if_outgoing); |
| 630 | |
| 631 | /* if the routes have been processed correctly, check and forward */ |
| 632 | if (forward) |
| 633 | batadv_v_ogm_forward(bat_priv, ogm2, orig_node, neigh_node, |
| 634 | if_incoming, if_outgoing); |
Antonio Quartulli | 9323158 | 2016-01-16 16:40:13 +0800 | [diff] [blame] | 635 | } |
| 636 | |
| 637 | /** |
| 638 | * batadv_v_ogm_aggr_packet - checks if there is another OGM aggregated |
| 639 | * @buff_pos: current position in the skb |
| 640 | * @packet_len: total length of the skb |
Sven Eckelmann | a1653da | 2019-08-22 08:55:36 +0200 | [diff] [blame] | 641 | * @ogm2_packet: potential OGM2 in buffer |
Antonio Quartulli | 9323158 | 2016-01-16 16:40:13 +0800 | [diff] [blame] | 642 | * |
| 643 | * Return: true if there is enough space for another OGM, false otherwise. |
| 644 | */ |
Sven Eckelmann | a1653da | 2019-08-22 08:55:36 +0200 | [diff] [blame] | 645 | static bool |
| 646 | batadv_v_ogm_aggr_packet(int buff_pos, int packet_len, |
| 647 | const struct batadv_ogm2_packet *ogm2_packet) |
Antonio Quartulli | 9323158 | 2016-01-16 16:40:13 +0800 | [diff] [blame] | 648 | { |
| 649 | int next_buff_pos = 0; |
| 650 | |
Sven Eckelmann | a1653da | 2019-08-22 08:55:36 +0200 | [diff] [blame] | 651 | /* check if there is enough space for the header */ |
| 652 | next_buff_pos += buff_pos + sizeof(*ogm2_packet); |
| 653 | if (next_buff_pos > packet_len) |
| 654 | return false; |
| 655 | |
| 656 | /* check if there is enough space for the optional TVLV */ |
| 657 | next_buff_pos += ntohs(ogm2_packet->tvlv_len); |
Antonio Quartulli | 9323158 | 2016-01-16 16:40:13 +0800 | [diff] [blame] | 658 | |
| 659 | return (next_buff_pos <= packet_len) && |
| 660 | (next_buff_pos <= BATADV_MAX_AGGREGATION_BYTES); |
| 661 | } |
| 662 | |
| 663 | /** |
| 664 | * batadv_v_ogm_process - process an incoming batman v OGM |
| 665 | * @skb: the skb containing the OGM |
| 666 | * @ogm_offset: offset to the OGM which should be processed (for aggregates) |
| 667 | * @if_incoming: the interface where this packet was receved |
| 668 | */ |
| 669 | static void batadv_v_ogm_process(const struct sk_buff *skb, int ogm_offset, |
| 670 | struct batadv_hard_iface *if_incoming) |
| 671 | { |
| 672 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
| 673 | struct ethhdr *ethhdr; |
| 674 | struct batadv_orig_node *orig_node = NULL; |
| 675 | struct batadv_hardif_neigh_node *hardif_neigh = NULL; |
| 676 | struct batadv_neigh_node *neigh_node = NULL; |
| 677 | struct batadv_hard_iface *hard_iface; |
| 678 | struct batadv_ogm2_packet *ogm_packet; |
| 679 | u32 ogm_throughput, link_throughput, path_throughput; |
| 680 | |
| 681 | ethhdr = eth_hdr(skb); |
| 682 | ogm_packet = (struct batadv_ogm2_packet *)(skb->data + ogm_offset); |
| 683 | |
| 684 | ogm_throughput = ntohl(ogm_packet->throughput); |
| 685 | |
| 686 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| 687 | "Received OGM2 packet via NB: %pM, IF: %s [%pM] (from OG: %pM, seqno %u, troughput %u, TTL %u, V %u, tvlv_len %u)\n", |
| 688 | ethhdr->h_source, if_incoming->net_dev->name, |
| 689 | if_incoming->net_dev->dev_addr, ogm_packet->orig, |
| 690 | ntohl(ogm_packet->seqno), ogm_throughput, ogm_packet->ttl, |
| 691 | ogm_packet->version, ntohs(ogm_packet->tvlv_len)); |
| 692 | |
| 693 | /* If the troughput metric is 0, immediately drop the packet. No need to |
| 694 | * create orig_node / neigh_node for an unusable route. |
| 695 | */ |
| 696 | if (ogm_throughput == 0) { |
| 697 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| 698 | "Drop packet: originator packet with troughput metric of 0\n"); |
| 699 | return; |
| 700 | } |
| 701 | |
| 702 | /* require ELP packets be to received from this neighbor first */ |
| 703 | hardif_neigh = batadv_hardif_neigh_get(if_incoming, ethhdr->h_source); |
| 704 | if (!hardif_neigh) { |
| 705 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| 706 | "Drop packet: OGM via unknown neighbor!\n"); |
| 707 | goto out; |
| 708 | } |
| 709 | |
| 710 | orig_node = batadv_v_ogm_orig_get(bat_priv, ogm_packet->orig); |
| 711 | if (!orig_node) |
| 712 | return; |
| 713 | |
Marek Lindner | 6f0a6b5 | 2016-05-03 01:52:08 +0800 | [diff] [blame] | 714 | neigh_node = batadv_neigh_node_get_or_create(orig_node, if_incoming, |
| 715 | ethhdr->h_source); |
Antonio Quartulli | 9323158 | 2016-01-16 16:40:13 +0800 | [diff] [blame] | 716 | if (!neigh_node) |
| 717 | goto out; |
| 718 | |
| 719 | /* Update the received throughput metric to match the link |
| 720 | * characteristic: |
| 721 | * - If this OGM traveled one hop so far (emitted by single hop |
| 722 | * neighbor) the path throughput metric equals the link throughput. |
| 723 | * - For OGMs traversing more than hop the path throughput metric is |
| 724 | * the smaller of the path throughput and the link throughput. |
| 725 | */ |
| 726 | link_throughput = ewma_throughput_read(&hardif_neigh->bat_v.throughput); |
| 727 | path_throughput = min_t(u32, link_throughput, ogm_throughput); |
| 728 | ogm_packet->throughput = htonl(path_throughput); |
| 729 | |
| 730 | batadv_v_ogm_process_per_outif(bat_priv, ethhdr, ogm_packet, orig_node, |
| 731 | neigh_node, if_incoming, |
| 732 | BATADV_IF_DEFAULT); |
| 733 | |
| 734 | rcu_read_lock(); |
| 735 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
| 736 | if (hard_iface->if_status != BATADV_IF_ACTIVE) |
| 737 | continue; |
| 738 | |
| 739 | if (hard_iface->soft_iface != bat_priv->soft_iface) |
| 740 | continue; |
| 741 | |
Sven Eckelmann | 2735344 | 2016-03-05 16:09:16 +0100 | [diff] [blame] | 742 | if (!kref_get_unless_zero(&hard_iface->refcount)) |
| 743 | continue; |
| 744 | |
Antonio Quartulli | 9323158 | 2016-01-16 16:40:13 +0800 | [diff] [blame] | 745 | batadv_v_ogm_process_per_outif(bat_priv, ethhdr, ogm_packet, |
| 746 | orig_node, neigh_node, |
| 747 | if_incoming, hard_iface); |
Sven Eckelmann | 2735344 | 2016-03-05 16:09:16 +0100 | [diff] [blame] | 748 | |
| 749 | batadv_hardif_put(hard_iface); |
Antonio Quartulli | 9323158 | 2016-01-16 16:40:13 +0800 | [diff] [blame] | 750 | } |
| 751 | rcu_read_unlock(); |
| 752 | out: |
| 753 | if (orig_node) |
| 754 | batadv_orig_node_put(orig_node); |
| 755 | if (neigh_node) |
| 756 | batadv_neigh_node_put(neigh_node); |
| 757 | if (hardif_neigh) |
| 758 | batadv_hardif_neigh_put(hardif_neigh); |
| 759 | } |
| 760 | |
| 761 | /** |
Antonio Quartulli | 0da0035 | 2016-01-16 16:40:12 +0800 | [diff] [blame] | 762 | * batadv_v_ogm_packet_recv - OGM2 receiving handler |
| 763 | * @skb: the received OGM |
| 764 | * @if_incoming: the interface where this OGM has been received |
| 765 | * |
| 766 | * Return: NET_RX_SUCCESS and consume the skb on success or returns NET_RX_DROP |
| 767 | * (without freeing the skb) on failure |
| 768 | */ |
| 769 | int batadv_v_ogm_packet_recv(struct sk_buff *skb, |
| 770 | struct batadv_hard_iface *if_incoming) |
| 771 | { |
| 772 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
| 773 | struct batadv_ogm2_packet *ogm_packet; |
| 774 | struct ethhdr *ethhdr = eth_hdr(skb); |
Antonio Quartulli | 9323158 | 2016-01-16 16:40:13 +0800 | [diff] [blame] | 775 | int ogm_offset; |
| 776 | u8 *packet_pos; |
| 777 | int ret = NET_RX_DROP; |
Antonio Quartulli | 0da0035 | 2016-01-16 16:40:12 +0800 | [diff] [blame] | 778 | |
| 779 | /* did we receive a OGM2 packet on an interface that does not have |
| 780 | * B.A.T.M.A.N. V enabled ? |
| 781 | */ |
Antonio Quartulli | 29824a5 | 2016-05-25 23:27:31 +0800 | [diff] [blame] | 782 | if (strcmp(bat_priv->algo_ops->name, "BATMAN_V") != 0) |
Antonio Quartulli | 0da0035 | 2016-01-16 16:40:12 +0800 | [diff] [blame] | 783 | return NET_RX_DROP; |
| 784 | |
| 785 | if (!batadv_check_management_packet(skb, if_incoming, BATADV_OGM2_HLEN)) |
| 786 | return NET_RX_DROP; |
| 787 | |
| 788 | if (batadv_is_my_mac(bat_priv, ethhdr->h_source)) |
| 789 | return NET_RX_DROP; |
| 790 | |
| 791 | ogm_packet = (struct batadv_ogm2_packet *)skb->data; |
| 792 | |
| 793 | if (batadv_is_my_mac(bat_priv, ogm_packet->orig)) |
| 794 | return NET_RX_DROP; |
| 795 | |
| 796 | batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX); |
| 797 | batadv_add_counter(bat_priv, BATADV_CNT_MGMT_RX_BYTES, |
| 798 | skb->len + ETH_HLEN); |
| 799 | |
Antonio Quartulli | 9323158 | 2016-01-16 16:40:13 +0800 | [diff] [blame] | 800 | ogm_offset = 0; |
| 801 | ogm_packet = (struct batadv_ogm2_packet *)skb->data; |
| 802 | |
| 803 | while (batadv_v_ogm_aggr_packet(ogm_offset, skb_headlen(skb), |
Sven Eckelmann | a1653da | 2019-08-22 08:55:36 +0200 | [diff] [blame] | 804 | ogm_packet)) { |
Antonio Quartulli | 9323158 | 2016-01-16 16:40:13 +0800 | [diff] [blame] | 805 | batadv_v_ogm_process(skb, ogm_offset, if_incoming); |
| 806 | |
| 807 | ogm_offset += BATADV_OGM2_HLEN; |
| 808 | ogm_offset += ntohs(ogm_packet->tvlv_len); |
| 809 | |
| 810 | packet_pos = skb->data + ogm_offset; |
| 811 | ogm_packet = (struct batadv_ogm2_packet *)packet_pos; |
| 812 | } |
| 813 | |
| 814 | ret = NET_RX_SUCCESS; |
Antonio Quartulli | 0da0035 | 2016-01-16 16:40:12 +0800 | [diff] [blame] | 815 | consume_skb(skb); |
Antonio Quartulli | 9323158 | 2016-01-16 16:40:13 +0800 | [diff] [blame] | 816 | |
| 817 | return ret; |
Antonio Quartulli | 0da0035 | 2016-01-16 16:40:12 +0800 | [diff] [blame] | 818 | } |
| 819 | |
| 820 | /** |
| 821 | * batadv_v_ogm_init - initialise the OGM2 engine |
| 822 | * @bat_priv: the bat priv with all the soft interface information |
| 823 | * |
| 824 | * Return: 0 on success or a negative error code in case of failure |
| 825 | */ |
| 826 | int batadv_v_ogm_init(struct batadv_priv *bat_priv) |
| 827 | { |
| 828 | struct batadv_ogm2_packet *ogm_packet; |
| 829 | unsigned char *ogm_buff; |
| 830 | u32 random_seqno; |
| 831 | |
| 832 | bat_priv->bat_v.ogm_buff_len = BATADV_OGM2_HLEN; |
| 833 | ogm_buff = kzalloc(bat_priv->bat_v.ogm_buff_len, GFP_ATOMIC); |
| 834 | if (!ogm_buff) |
| 835 | return -ENOMEM; |
| 836 | |
| 837 | bat_priv->bat_v.ogm_buff = ogm_buff; |
| 838 | ogm_packet = (struct batadv_ogm2_packet *)ogm_buff; |
| 839 | ogm_packet->packet_type = BATADV_OGM2; |
| 840 | ogm_packet->version = BATADV_COMPAT_VERSION; |
| 841 | ogm_packet->ttl = BATADV_TTL; |
| 842 | ogm_packet->flags = BATADV_NO_FLAGS; |
| 843 | ogm_packet->throughput = htonl(BATADV_THROUGHPUT_MAX_VALUE); |
| 844 | |
| 845 | /* randomize initial seqno to avoid collision */ |
| 846 | get_random_bytes(&random_seqno, sizeof(random_seqno)); |
| 847 | atomic_set(&bat_priv->bat_v.ogm_seqno, random_seqno); |
| 848 | INIT_DELAYED_WORK(&bat_priv->bat_v.ogm_wq, batadv_v_ogm_send); |
| 849 | |
Sven Eckelmann | 5841c1b | 2020-03-16 23:31:03 +0100 | [diff] [blame] | 850 | mutex_init(&bat_priv->bat_v.ogm_buff_mutex); |
| 851 | |
Antonio Quartulli | 0da0035 | 2016-01-16 16:40:12 +0800 | [diff] [blame] | 852 | return 0; |
| 853 | } |
| 854 | |
| 855 | /** |
| 856 | * batadv_v_ogm_free - free OGM private resources |
| 857 | * @bat_priv: the bat priv with all the soft interface information |
| 858 | */ |
| 859 | void batadv_v_ogm_free(struct batadv_priv *bat_priv) |
| 860 | { |
| 861 | cancel_delayed_work_sync(&bat_priv->bat_v.ogm_wq); |
| 862 | |
Sven Eckelmann | 5841c1b | 2020-03-16 23:31:03 +0100 | [diff] [blame] | 863 | mutex_lock(&bat_priv->bat_v.ogm_buff_mutex); |
| 864 | |
Antonio Quartulli | 0da0035 | 2016-01-16 16:40:12 +0800 | [diff] [blame] | 865 | kfree(bat_priv->bat_v.ogm_buff); |
| 866 | bat_priv->bat_v.ogm_buff = NULL; |
| 867 | bat_priv->bat_v.ogm_buff_len = 0; |
Sven Eckelmann | 5841c1b | 2020-03-16 23:31:03 +0100 | [diff] [blame] | 868 | |
| 869 | mutex_unlock(&bat_priv->bat_v.ogm_buff_mutex); |
Antonio Quartulli | 0da0035 | 2016-01-16 16:40:12 +0800 | [diff] [blame] | 870 | } |