#include "hash.h"
#include "originator.h"
#include "packet.h"
+#include "sysfs.h"
#include "translation-table.h"
static const u8 batadv_announce_mac[4] = {0x43, 0x05, 0x43, 0x05};
ethhdr->h_source, ethhdr->h_dest,
BATADV_PRINT_VID(vid));
break;
+ case BATADV_CLAIM_TYPE_LOOPDETECT:
+ ether_addr_copy(ethhdr->h_source, mac);
+ batadv_dbg(BATADV_DBG_BLA, bat_priv,
+ "bla_send_claim(): LOOPDETECT of %pM to %pM on vid %d\n",
+ ethhdr->h_source, ethhdr->h_dest,
+ BATADV_PRINT_VID(vid));
+
+ break;
}
if (vid & BATADV_VLAN_HAS_TAG)
batadv_hardif_put(primary_if);
}
+/**
+ * batadv_bla_loopdetect_report - worker for reporting the loop
+ * @work: work queue item
+ *
+ * Throws an uevent, as the loopdetect check function can't do that itself
+ * since the kernel may sleep while throwing uevents.
+ */
+static void batadv_bla_loopdetect_report(struct work_struct *work)
+{
+ struct batadv_bla_backbone_gw *backbone_gw;
+ struct batadv_priv *bat_priv;
+ char vid_str[6] = { '\0' };
+
+ backbone_gw = container_of(work, struct batadv_bla_backbone_gw,
+ report_work);
+ bat_priv = backbone_gw->bat_priv;
+
+ batadv_info(bat_priv->soft_iface,
+ "Possible loop on VLAN %d detected which can't be handled by BLA - please check your network setup!\n",
+ BATADV_PRINT_VID(backbone_gw->vid));
+ snprintf(vid_str, sizeof(vid_str), "%d",
+ BATADV_PRINT_VID(backbone_gw->vid));
+ vid_str[sizeof(vid_str) - 1] = 0;
+
+ batadv_throw_uevent(bat_priv, BATADV_UEV_BLA, BATADV_UEV_LOOPDETECT,
+ vid_str);
+
+ batadv_backbone_gw_put(backbone_gw);
+}
+
/**
* batadv_bla_get_backbone_gw - finds or creates a backbone gateway
* @bat_priv: the bat priv with all the soft interface information
atomic_set(&entry->request_sent, 0);
atomic_set(&entry->wait_periods, 0);
ether_addr_copy(entry->orig, orig);
+ INIT_WORK(&entry->report_work, batadv_bla_loopdetect_report);
/* one for the hash, one for returning */
kref_init(&entry->refcount);
if (vlan_depth > 1)
return 1;
+ /* Let the loopdetect frames on the mesh in any case. */
+ if (bla_dst->type == BATADV_CLAIM_TYPE_LOOPDETECT)
+ return 0;
+
/* check if it is a claim frame. */
ret = batadv_check_claim_group(bat_priv, primary_if, hw_src, hw_dst,
ethhdr);
}
}
+/**
+ * batadv_bla_send_loopdetect - send a loopdetect frame
+ * @bat_priv: the bat priv with all the soft interface information
+ * @backbone_gw: the backbone gateway for which a loop should be detected
+ *
+ * To detect loops that the bridge loop avoidance can't handle, send a loop
+ * detection packet on the backbone. Unlike other BLA frames, this frame will
+ * be allowed on the mesh by other nodes. If it is received on the mesh, this
+ * indicates that there is a loop.
+ */
+static void
+batadv_bla_send_loopdetect(struct batadv_priv *bat_priv,
+ struct batadv_bla_backbone_gw *backbone_gw)
+{
+ batadv_dbg(BATADV_DBG_BLA, bat_priv, "Send loopdetect frame for vid %d\n",
+ backbone_gw->vid);
+ batadv_bla_send_claim(bat_priv, bat_priv->bla.loopdetect_addr,
+ backbone_gw->vid, BATADV_CLAIM_TYPE_LOOPDETECT);
+}
+
/**
* batadv_bla_status_update - purge bla interfaces if necessary
* @net_dev: the soft interface net device
struct batadv_bla_backbone_gw *backbone_gw;
struct batadv_hashtable *hash;
struct batadv_hard_iface *primary_if;
+ bool send_loopdetect = false;
int i;
delayed_work = to_delayed_work(work);
if (!atomic_read(&bat_priv->bridge_loop_avoidance))
goto out;
+ if (atomic_dec_and_test(&bat_priv->bla.loopdetect_next)) {
+ /* set a new random mac address for the next bridge loop
+ * detection frames. Set the locally administered bit to avoid
+ * collisions with users mac addresses.
+ */
+ random_ether_addr(bat_priv->bla.loopdetect_addr);
+ bat_priv->bla.loopdetect_addr[0] = 0xba;
+ bat_priv->bla.loopdetect_addr[1] = 0xbe;
+ bat_priv->bla.loopdetect_lasttime = jiffies;
+ atomic_set(&bat_priv->bla.loopdetect_next,
+ BATADV_BLA_LOOPDETECT_PERIODS);
+
+ /* mark for sending loop detect on all VLANs */
+ send_loopdetect = true;
+ }
+
hash = bat_priv->bla.backbone_hash;
if (!hash)
goto out;
backbone_gw->lasttime = jiffies;
batadv_bla_send_announce(bat_priv, backbone_gw);
+ if (send_loopdetect)
+ batadv_bla_send_loopdetect(bat_priv,
+ backbone_gw);
/* request_sent is only set after creation to avoid
* problems when we are not yet known as backbone gw
bat_priv->bla.bcast_duplist[i].entrytime = entrytime;
bat_priv->bla.bcast_duplist_curr = 0;
+ atomic_set(&bat_priv->bla.loopdetect_next,
+ BATADV_BLA_LOOPDETECT_PERIODS);
+
if (bat_priv->bla.claim_hash)
return 0;
batadv_hardif_put(primary_if);
}
+/**
+ * batadv_bla_loopdetect_check - check and handle a detected loop
+ * @bat_priv: the bat priv with all the soft interface information
+ * @skb: the packet to check
+ * @primary_if: interface where the request came on
+ * @vid: the VLAN ID of the frame
+ *
+ * Checks if this packet is a loop detect frame which has been sent by us,
+ * throw an uevent and log the event if that is the case.
+ *
+ * Return: true if it is a loop detect frame which is to be dropped, false
+ * otherwise.
+ */
+static bool
+batadv_bla_loopdetect_check(struct batadv_priv *bat_priv, struct sk_buff *skb,
+ struct batadv_hard_iface *primary_if,
+ unsigned short vid)
+{
+ struct batadv_bla_backbone_gw *backbone_gw;
+ struct ethhdr *ethhdr;
+
+ ethhdr = eth_hdr(skb);
+
+ /* Only check for the MAC address and skip more checks here for
+ * performance reasons - this function is on the hotpath, after all.
+ */
+ if (!batadv_compare_eth(ethhdr->h_source,
+ bat_priv->bla.loopdetect_addr))
+ return false;
+
+ /* If the packet came too late, don't forward it on the mesh
+ * but don't consider that as loop. It might be a coincidence.
+ */
+ if (batadv_has_timed_out(bat_priv->bla.loopdetect_lasttime,
+ BATADV_BLA_LOOPDETECT_TIMEOUT))
+ return true;
+
+ backbone_gw = batadv_bla_get_backbone_gw(bat_priv,
+ primary_if->net_dev->dev_addr,
+ vid, true);
+ if (unlikely(!backbone_gw))
+ return true;
+
+ queue_work(batadv_event_workqueue, &backbone_gw->report_work);
+ /* backbone_gw is unreferenced in the report work function function */
+
+ return true;
+}
+
/**
* batadv_bla_rx - check packets coming from the mesh.
* @bat_priv: the bat priv with all the soft interface information
if (!atomic_read(&bat_priv->bridge_loop_avoidance))
goto allow;
+ if (batadv_bla_loopdetect_check(bat_priv, skb, primary_if, vid))
+ goto handled;
+
if (unlikely(atomic_read(&bat_priv->bla.num_requests)))
/* don't allow broadcasts while requests are in flight */
if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast)
projects / openwrt / staging / blogic.git / commitdiff