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2506 lines
69 KiB
2506 lines
69 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* Copyright (C) B.A.T.M.A.N. contributors: |
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* |
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* Simon Wunderlich |
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*/ |
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|
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#include "bridge_loop_avoidance.h" |
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#include "main.h" |
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|
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#include <linux/atomic.h> |
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#include <linux/byteorder/generic.h> |
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#include <linux/compiler.h> |
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#include <linux/crc16.h> |
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#include <linux/errno.h> |
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#include <linux/etherdevice.h> |
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#include <linux/gfp.h> |
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#include <linux/if_arp.h> |
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#include <linux/if_ether.h> |
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#include <linux/if_vlan.h> |
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#include <linux/jhash.h> |
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#include <linux/jiffies.h> |
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#include <linux/kernel.h> |
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#include <linux/kref.h> |
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#include <linux/list.h> |
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#include <linux/lockdep.h> |
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#include <linux/netdevice.h> |
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#include <linux/netlink.h> |
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#include <linux/preempt.h> |
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#include <linux/rculist.h> |
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#include <linux/rcupdate.h> |
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#include <linux/skbuff.h> |
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#include <linux/slab.h> |
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#include <linux/spinlock.h> |
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#include <linux/stddef.h> |
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#include <linux/string.h> |
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#include <linux/workqueue.h> |
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#include <net/arp.h> |
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#include <net/genetlink.h> |
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#include <net/netlink.h> |
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#include <net/sock.h> |
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#include <uapi/linux/batadv_packet.h> |
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#include <uapi/linux/batman_adv.h> |
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#include "hard-interface.h" |
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#include "hash.h" |
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#include "log.h" |
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#include "netlink.h" |
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#include "originator.h" |
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#include "soft-interface.h" |
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#include "translation-table.h" |
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static const u8 batadv_announce_mac[4] = {0x43, 0x05, 0x43, 0x05}; |
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|
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static void batadv_bla_periodic_work(struct work_struct *work); |
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static void |
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batadv_bla_send_announce(struct batadv_priv *bat_priv, |
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struct batadv_bla_backbone_gw *backbone_gw); |
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/** |
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* batadv_choose_claim() - choose the right bucket for a claim. |
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* @data: data to hash |
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* @size: size of the hash table |
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* |
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* Return: the hash index of the claim |
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*/ |
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static inline u32 batadv_choose_claim(const void *data, u32 size) |
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{ |
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struct batadv_bla_claim *claim = (struct batadv_bla_claim *)data; |
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u32 hash = 0; |
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hash = jhash(&claim->addr, sizeof(claim->addr), hash); |
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hash = jhash(&claim->vid, sizeof(claim->vid), hash); |
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return hash % size; |
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} |
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/** |
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* batadv_choose_backbone_gw() - choose the right bucket for a backbone gateway. |
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* @data: data to hash |
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* @size: size of the hash table |
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* |
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* Return: the hash index of the backbone gateway |
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*/ |
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static inline u32 batadv_choose_backbone_gw(const void *data, u32 size) |
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{ |
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const struct batadv_bla_backbone_gw *gw; |
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u32 hash = 0; |
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gw = (struct batadv_bla_backbone_gw *)data; |
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hash = jhash(&gw->orig, sizeof(gw->orig), hash); |
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hash = jhash(&gw->vid, sizeof(gw->vid), hash); |
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return hash % size; |
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} |
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/** |
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* batadv_compare_backbone_gw() - compare address and vid of two backbone gws |
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* @node: list node of the first entry to compare |
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* @data2: pointer to the second backbone gateway |
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* |
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* Return: true if the backbones have the same data, false otherwise |
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*/ |
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static bool batadv_compare_backbone_gw(const struct hlist_node *node, |
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const void *data2) |
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{ |
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const void *data1 = container_of(node, struct batadv_bla_backbone_gw, |
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hash_entry); |
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const struct batadv_bla_backbone_gw *gw1 = data1; |
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const struct batadv_bla_backbone_gw *gw2 = data2; |
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if (!batadv_compare_eth(gw1->orig, gw2->orig)) |
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return false; |
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if (gw1->vid != gw2->vid) |
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return false; |
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return true; |
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} |
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/** |
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* batadv_compare_claim() - compare address and vid of two claims |
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* @node: list node of the first entry to compare |
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* @data2: pointer to the second claims |
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* |
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* Return: true if the claim have the same data, 0 otherwise |
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*/ |
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static bool batadv_compare_claim(const struct hlist_node *node, |
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const void *data2) |
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{ |
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const void *data1 = container_of(node, struct batadv_bla_claim, |
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hash_entry); |
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const struct batadv_bla_claim *cl1 = data1; |
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const struct batadv_bla_claim *cl2 = data2; |
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if (!batadv_compare_eth(cl1->addr, cl2->addr)) |
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return false; |
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if (cl1->vid != cl2->vid) |
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return false; |
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return true; |
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} |
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/** |
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* batadv_backbone_gw_release() - release backbone gw from lists and queue for |
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* free after rcu grace period |
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* @ref: kref pointer of the backbone gw |
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*/ |
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static void batadv_backbone_gw_release(struct kref *ref) |
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{ |
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struct batadv_bla_backbone_gw *backbone_gw; |
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backbone_gw = container_of(ref, struct batadv_bla_backbone_gw, |
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refcount); |
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kfree_rcu(backbone_gw, rcu); |
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} |
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/** |
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* batadv_backbone_gw_put() - decrement the backbone gw refcounter and possibly |
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* release it |
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* @backbone_gw: backbone gateway to be free'd |
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*/ |
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static void batadv_backbone_gw_put(struct batadv_bla_backbone_gw *backbone_gw) |
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{ |
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kref_put(&backbone_gw->refcount, batadv_backbone_gw_release); |
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} |
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/** |
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* batadv_claim_release() - release claim from lists and queue for free after |
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* rcu grace period |
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* @ref: kref pointer of the claim |
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*/ |
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static void batadv_claim_release(struct kref *ref) |
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{ |
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struct batadv_bla_claim *claim; |
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struct batadv_bla_backbone_gw *old_backbone_gw; |
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claim = container_of(ref, struct batadv_bla_claim, refcount); |
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spin_lock_bh(&claim->backbone_lock); |
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old_backbone_gw = claim->backbone_gw; |
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claim->backbone_gw = NULL; |
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spin_unlock_bh(&claim->backbone_lock); |
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spin_lock_bh(&old_backbone_gw->crc_lock); |
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old_backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); |
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spin_unlock_bh(&old_backbone_gw->crc_lock); |
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batadv_backbone_gw_put(old_backbone_gw); |
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kfree_rcu(claim, rcu); |
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} |
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/** |
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* batadv_claim_put() - decrement the claim refcounter and possibly release it |
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* @claim: claim to be free'd |
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*/ |
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static void batadv_claim_put(struct batadv_bla_claim *claim) |
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{ |
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kref_put(&claim->refcount, batadv_claim_release); |
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} |
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/** |
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* batadv_claim_hash_find() - looks for a claim in the claim hash |
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* @bat_priv: the bat priv with all the soft interface information |
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* @data: search data (may be local/static data) |
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* |
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* Return: claim if found or NULL otherwise. |
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*/ |
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static struct batadv_bla_claim * |
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batadv_claim_hash_find(struct batadv_priv *bat_priv, |
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struct batadv_bla_claim *data) |
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{ |
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struct batadv_hashtable *hash = bat_priv->bla.claim_hash; |
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struct hlist_head *head; |
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struct batadv_bla_claim *claim; |
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struct batadv_bla_claim *claim_tmp = NULL; |
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int index; |
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if (!hash) |
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return NULL; |
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index = batadv_choose_claim(data, hash->size); |
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head = &hash->table[index]; |
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rcu_read_lock(); |
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hlist_for_each_entry_rcu(claim, head, hash_entry) { |
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if (!batadv_compare_claim(&claim->hash_entry, data)) |
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continue; |
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if (!kref_get_unless_zero(&claim->refcount)) |
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continue; |
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claim_tmp = claim; |
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break; |
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} |
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rcu_read_unlock(); |
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return claim_tmp; |
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} |
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/** |
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* batadv_backbone_hash_find() - looks for a backbone gateway in the hash |
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* @bat_priv: the bat priv with all the soft interface information |
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* @addr: the address of the originator |
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* @vid: the VLAN ID |
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* |
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* Return: backbone gateway if found or NULL otherwise |
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*/ |
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static struct batadv_bla_backbone_gw * |
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batadv_backbone_hash_find(struct batadv_priv *bat_priv, u8 *addr, |
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unsigned short vid) |
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{ |
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struct batadv_hashtable *hash = bat_priv->bla.backbone_hash; |
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struct hlist_head *head; |
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struct batadv_bla_backbone_gw search_entry, *backbone_gw; |
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struct batadv_bla_backbone_gw *backbone_gw_tmp = NULL; |
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int index; |
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if (!hash) |
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return NULL; |
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ether_addr_copy(search_entry.orig, addr); |
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search_entry.vid = vid; |
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index = batadv_choose_backbone_gw(&search_entry, hash->size); |
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head = &hash->table[index]; |
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rcu_read_lock(); |
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hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
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if (!batadv_compare_backbone_gw(&backbone_gw->hash_entry, |
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&search_entry)) |
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continue; |
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if (!kref_get_unless_zero(&backbone_gw->refcount)) |
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continue; |
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backbone_gw_tmp = backbone_gw; |
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break; |
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} |
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rcu_read_unlock(); |
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return backbone_gw_tmp; |
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} |
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/** |
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* batadv_bla_del_backbone_claims() - delete all claims for a backbone |
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* @backbone_gw: backbone gateway where the claims should be removed |
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*/ |
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static void |
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batadv_bla_del_backbone_claims(struct batadv_bla_backbone_gw *backbone_gw) |
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{ |
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struct batadv_hashtable *hash; |
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struct hlist_node *node_tmp; |
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struct hlist_head *head; |
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struct batadv_bla_claim *claim; |
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int i; |
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spinlock_t *list_lock; /* protects write access to the hash lists */ |
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hash = backbone_gw->bat_priv->bla.claim_hash; |
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if (!hash) |
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return; |
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for (i = 0; i < hash->size; i++) { |
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head = &hash->table[i]; |
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list_lock = &hash->list_locks[i]; |
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spin_lock_bh(list_lock); |
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hlist_for_each_entry_safe(claim, node_tmp, |
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head, hash_entry) { |
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if (claim->backbone_gw != backbone_gw) |
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continue; |
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batadv_claim_put(claim); |
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hlist_del_rcu(&claim->hash_entry); |
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} |
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spin_unlock_bh(list_lock); |
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} |
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/* all claims gone, initialize CRC */ |
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spin_lock_bh(&backbone_gw->crc_lock); |
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backbone_gw->crc = BATADV_BLA_CRC_INIT; |
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spin_unlock_bh(&backbone_gw->crc_lock); |
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} |
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/** |
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* batadv_bla_send_claim() - sends a claim frame according to the provided info |
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* @bat_priv: the bat priv with all the soft interface information |
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* @mac: the mac address to be announced within the claim |
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* @vid: the VLAN ID |
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* @claimtype: the type of the claim (CLAIM, UNCLAIM, ANNOUNCE, ...) |
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*/ |
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static void batadv_bla_send_claim(struct batadv_priv *bat_priv, u8 *mac, |
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unsigned short vid, int claimtype) |
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{ |
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struct sk_buff *skb; |
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struct ethhdr *ethhdr; |
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struct batadv_hard_iface *primary_if; |
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struct net_device *soft_iface; |
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u8 *hw_src; |
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struct batadv_bla_claim_dst local_claim_dest; |
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__be32 zeroip = 0; |
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primary_if = batadv_primary_if_get_selected(bat_priv); |
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if (!primary_if) |
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return; |
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memcpy(&local_claim_dest, &bat_priv->bla.claim_dest, |
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sizeof(local_claim_dest)); |
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local_claim_dest.type = claimtype; |
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soft_iface = primary_if->soft_iface; |
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skb = arp_create(ARPOP_REPLY, ETH_P_ARP, |
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/* IP DST: 0.0.0.0 */ |
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zeroip, |
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primary_if->soft_iface, |
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/* IP SRC: 0.0.0.0 */ |
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zeroip, |
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/* Ethernet DST: Broadcast */ |
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NULL, |
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/* Ethernet SRC/HW SRC: originator mac */ |
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primary_if->net_dev->dev_addr, |
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/* HW DST: FF:43:05:XX:YY:YY |
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* with XX = claim type |
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* and YY:YY = group id |
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*/ |
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(u8 *)&local_claim_dest); |
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if (!skb) |
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goto out; |
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ethhdr = (struct ethhdr *)skb->data; |
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hw_src = (u8 *)ethhdr + ETH_HLEN + sizeof(struct arphdr); |
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/* now we pretend that the client would have sent this ... */ |
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switch (claimtype) { |
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case BATADV_CLAIM_TYPE_CLAIM: |
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/* normal claim frame |
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* set Ethernet SRC to the clients mac |
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*/ |
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ether_addr_copy(ethhdr->h_source, mac); |
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batadv_dbg(BATADV_DBG_BLA, bat_priv, |
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"%s(): CLAIM %pM on vid %d\n", __func__, mac, |
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batadv_print_vid(vid)); |
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break; |
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case BATADV_CLAIM_TYPE_UNCLAIM: |
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/* unclaim frame |
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* set HW SRC to the clients mac |
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*/ |
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ether_addr_copy(hw_src, mac); |
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batadv_dbg(BATADV_DBG_BLA, bat_priv, |
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"%s(): UNCLAIM %pM on vid %d\n", __func__, mac, |
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batadv_print_vid(vid)); |
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break; |
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case BATADV_CLAIM_TYPE_ANNOUNCE: |
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/* announcement frame |
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* set HW SRC to the special mac containg the crc |
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*/ |
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ether_addr_copy(hw_src, mac); |
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batadv_dbg(BATADV_DBG_BLA, bat_priv, |
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"%s(): ANNOUNCE of %pM on vid %d\n", __func__, |
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ethhdr->h_source, batadv_print_vid(vid)); |
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break; |
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case BATADV_CLAIM_TYPE_REQUEST: |
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/* request frame |
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* set HW SRC and header destination to the receiving backbone |
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* gws mac |
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*/ |
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ether_addr_copy(hw_src, mac); |
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ether_addr_copy(ethhdr->h_dest, mac); |
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batadv_dbg(BATADV_DBG_BLA, bat_priv, |
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"%s(): REQUEST of %pM to %pM on vid %d\n", __func__, |
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ethhdr->h_source, ethhdr->h_dest, |
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batadv_print_vid(vid)); |
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break; |
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case BATADV_CLAIM_TYPE_LOOPDETECT: |
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ether_addr_copy(ethhdr->h_source, mac); |
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batadv_dbg(BATADV_DBG_BLA, bat_priv, |
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"%s(): LOOPDETECT of %pM to %pM on vid %d\n", |
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__func__, ethhdr->h_source, ethhdr->h_dest, |
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batadv_print_vid(vid)); |
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|
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break; |
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} |
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|
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if (vid & BATADV_VLAN_HAS_TAG) { |
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skb = vlan_insert_tag(skb, htons(ETH_P_8021Q), |
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vid & VLAN_VID_MASK); |
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if (!skb) |
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goto out; |
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} |
|
|
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skb_reset_mac_header(skb); |
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skb->protocol = eth_type_trans(skb, soft_iface); |
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batadv_inc_counter(bat_priv, BATADV_CNT_RX); |
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batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES, |
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skb->len + ETH_HLEN); |
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|
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if (in_interrupt()) |
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netif_rx(skb); |
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else |
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netif_rx_ni(skb); |
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out: |
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if (primary_if) |
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batadv_hardif_put(primary_if); |
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} |
|
|
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/** |
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* batadv_bla_loopdetect_report() - worker for reporting the loop |
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* @work: work queue item |
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* |
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* Throws an uevent, as the loopdetect check function can't do that itself |
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* since the kernel may sleep while throwing uevents. |
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*/ |
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static void batadv_bla_loopdetect_report(struct work_struct *work) |
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{ |
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struct batadv_bla_backbone_gw *backbone_gw; |
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struct batadv_priv *bat_priv; |
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char vid_str[6] = { '\0' }; |
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|
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backbone_gw = container_of(work, struct batadv_bla_backbone_gw, |
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report_work); |
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bat_priv = backbone_gw->bat_priv; |
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|
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batadv_info(bat_priv->soft_iface, |
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"Possible loop on VLAN %d detected which can't be handled by BLA - please check your network setup!\n", |
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batadv_print_vid(backbone_gw->vid)); |
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snprintf(vid_str, sizeof(vid_str), "%d", |
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batadv_print_vid(backbone_gw->vid)); |
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vid_str[sizeof(vid_str) - 1] = 0; |
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|
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batadv_throw_uevent(bat_priv, BATADV_UEV_BLA, BATADV_UEV_LOOPDETECT, |
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vid_str); |
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|
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batadv_backbone_gw_put(backbone_gw); |
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} |
|
|
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/** |
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* batadv_bla_get_backbone_gw() - finds or creates a backbone gateway |
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* @bat_priv: the bat priv with all the soft interface information |
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* @orig: the mac address of the originator |
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* @vid: the VLAN ID |
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* @own_backbone: set if the requested backbone is local |
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* |
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* Return: the (possibly created) backbone gateway or NULL on error |
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*/ |
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static struct batadv_bla_backbone_gw * |
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batadv_bla_get_backbone_gw(struct batadv_priv *bat_priv, u8 *orig, |
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unsigned short vid, bool own_backbone) |
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{ |
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struct batadv_bla_backbone_gw *entry; |
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struct batadv_orig_node *orig_node; |
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int hash_added; |
|
|
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entry = batadv_backbone_hash_find(bat_priv, orig, vid); |
|
|
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if (entry) |
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return entry; |
|
|
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batadv_dbg(BATADV_DBG_BLA, bat_priv, |
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"%s(): not found (%pM, %d), creating new entry\n", __func__, |
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orig, batadv_print_vid(vid)); |
|
|
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entry = kzalloc(sizeof(*entry), GFP_ATOMIC); |
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if (!entry) |
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return NULL; |
|
|
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entry->vid = vid; |
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entry->lasttime = jiffies; |
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entry->crc = BATADV_BLA_CRC_INIT; |
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entry->bat_priv = bat_priv; |
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spin_lock_init(&entry->crc_lock); |
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atomic_set(&entry->request_sent, 0); |
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atomic_set(&entry->wait_periods, 0); |
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ether_addr_copy(entry->orig, orig); |
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INIT_WORK(&entry->report_work, batadv_bla_loopdetect_report); |
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kref_init(&entry->refcount); |
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|
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kref_get(&entry->refcount); |
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hash_added = batadv_hash_add(bat_priv->bla.backbone_hash, |
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batadv_compare_backbone_gw, |
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batadv_choose_backbone_gw, entry, |
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&entry->hash_entry); |
|
|
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if (unlikely(hash_added != 0)) { |
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/* hash failed, free the structure */ |
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kfree(entry); |
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return NULL; |
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} |
|
|
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/* this is a gateway now, remove any TT entry on this VLAN */ |
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orig_node = batadv_orig_hash_find(bat_priv, orig); |
|
if (orig_node) { |
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batadv_tt_global_del_orig(bat_priv, orig_node, vid, |
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"became a backbone gateway"); |
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batadv_orig_node_put(orig_node); |
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} |
|
|
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if (own_backbone) { |
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batadv_bla_send_announce(bat_priv, entry); |
|
|
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/* this will be decreased in the worker thread */ |
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atomic_inc(&entry->request_sent); |
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atomic_set(&entry->wait_periods, BATADV_BLA_WAIT_PERIODS); |
|
atomic_inc(&bat_priv->bla.num_requests); |
|
} |
|
|
|
return entry; |
|
} |
|
|
|
/** |
|
* batadv_bla_update_own_backbone_gw() - updates the own backbone gw for a VLAN |
|
* @bat_priv: the bat priv with all the soft interface information |
|
* @primary_if: the selected primary interface |
|
* @vid: VLAN identifier |
|
* |
|
* update or add the own backbone gw to make sure we announce |
|
* where we receive other backbone gws |
|
*/ |
|
static void |
|
batadv_bla_update_own_backbone_gw(struct batadv_priv *bat_priv, |
|
struct batadv_hard_iface *primary_if, |
|
unsigned short vid) |
|
{ |
|
struct batadv_bla_backbone_gw *backbone_gw; |
|
|
|
backbone_gw = batadv_bla_get_backbone_gw(bat_priv, |
|
primary_if->net_dev->dev_addr, |
|
vid, true); |
|
if (unlikely(!backbone_gw)) |
|
return; |
|
|
|
backbone_gw->lasttime = jiffies; |
|
batadv_backbone_gw_put(backbone_gw); |
|
} |
|
|
|
/** |
|
* batadv_bla_answer_request() - answer a bla request by sending own claims |
|
* @bat_priv: the bat priv with all the soft interface information |
|
* @primary_if: interface where the request came on |
|
* @vid: the vid where the request came on |
|
* |
|
* Repeat all of our own claims, and finally send an ANNOUNCE frame |
|
* to allow the requester another check if the CRC is correct now. |
|
*/ |
|
static void batadv_bla_answer_request(struct batadv_priv *bat_priv, |
|
struct batadv_hard_iface *primary_if, |
|
unsigned short vid) |
|
{ |
|
struct hlist_head *head; |
|
struct batadv_hashtable *hash; |
|
struct batadv_bla_claim *claim; |
|
struct batadv_bla_backbone_gw *backbone_gw; |
|
int i; |
|
|
|
batadv_dbg(BATADV_DBG_BLA, bat_priv, |
|
"%s(): received a claim request, send all of our own claims again\n", |
|
__func__); |
|
|
|
backbone_gw = batadv_backbone_hash_find(bat_priv, |
|
primary_if->net_dev->dev_addr, |
|
vid); |
|
if (!backbone_gw) |
|
return; |
|
|
|
hash = bat_priv->bla.claim_hash; |
|
for (i = 0; i < hash->size; i++) { |
|
head = &hash->table[i]; |
|
|
|
rcu_read_lock(); |
|
hlist_for_each_entry_rcu(claim, head, hash_entry) { |
|
/* only own claims are interesting */ |
|
if (claim->backbone_gw != backbone_gw) |
|
continue; |
|
|
|
batadv_bla_send_claim(bat_priv, claim->addr, claim->vid, |
|
BATADV_CLAIM_TYPE_CLAIM); |
|
} |
|
rcu_read_unlock(); |
|
} |
|
|
|
/* finally, send an announcement frame */ |
|
batadv_bla_send_announce(bat_priv, backbone_gw); |
|
batadv_backbone_gw_put(backbone_gw); |
|
} |
|
|
|
/** |
|
* batadv_bla_send_request() - send a request to repeat claims |
|
* @backbone_gw: the backbone gateway from whom we are out of sync |
|
* |
|
* When the crc is wrong, ask the backbone gateway for a full table update. |
|
* After the request, it will repeat all of his own claims and finally |
|
* send an announcement claim with which we can check again. |
|
*/ |
|
static void batadv_bla_send_request(struct batadv_bla_backbone_gw *backbone_gw) |
|
{ |
|
/* first, remove all old entries */ |
|
batadv_bla_del_backbone_claims(backbone_gw); |
|
|
|
batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
|
"Sending REQUEST to %pM\n", backbone_gw->orig); |
|
|
|
/* send request */ |
|
batadv_bla_send_claim(backbone_gw->bat_priv, backbone_gw->orig, |
|
backbone_gw->vid, BATADV_CLAIM_TYPE_REQUEST); |
|
|
|
/* no local broadcasts should be sent or received, for now. */ |
|
if (!atomic_read(&backbone_gw->request_sent)) { |
|
atomic_inc(&backbone_gw->bat_priv->bla.num_requests); |
|
atomic_set(&backbone_gw->request_sent, 1); |
|
} |
|
} |
|
|
|
/** |
|
* batadv_bla_send_announce() - Send an announcement frame |
|
* @bat_priv: the bat priv with all the soft interface information |
|
* @backbone_gw: our backbone gateway which should be announced |
|
*/ |
|
static void batadv_bla_send_announce(struct batadv_priv *bat_priv, |
|
struct batadv_bla_backbone_gw *backbone_gw) |
|
{ |
|
u8 mac[ETH_ALEN]; |
|
__be16 crc; |
|
|
|
memcpy(mac, batadv_announce_mac, 4); |
|
spin_lock_bh(&backbone_gw->crc_lock); |
|
crc = htons(backbone_gw->crc); |
|
spin_unlock_bh(&backbone_gw->crc_lock); |
|
memcpy(&mac[4], &crc, 2); |
|
|
|
batadv_bla_send_claim(bat_priv, mac, backbone_gw->vid, |
|
BATADV_CLAIM_TYPE_ANNOUNCE); |
|
} |
|
|
|
/** |
|
* batadv_bla_add_claim() - Adds a claim in the claim hash |
|
* @bat_priv: the bat priv with all the soft interface information |
|
* @mac: the mac address of the claim |
|
* @vid: the VLAN ID of the frame |
|
* @backbone_gw: the backbone gateway which claims it |
|
*/ |
|
static void batadv_bla_add_claim(struct batadv_priv *bat_priv, |
|
const u8 *mac, const unsigned short vid, |
|
struct batadv_bla_backbone_gw *backbone_gw) |
|
{ |
|
struct batadv_bla_backbone_gw *old_backbone_gw; |
|
struct batadv_bla_claim *claim; |
|
struct batadv_bla_claim search_claim; |
|
bool remove_crc = false; |
|
int hash_added; |
|
|
|
ether_addr_copy(search_claim.addr, mac); |
|
search_claim.vid = vid; |
|
claim = batadv_claim_hash_find(bat_priv, &search_claim); |
|
|
|
/* create a new claim entry if it does not exist yet. */ |
|
if (!claim) { |
|
claim = kzalloc(sizeof(*claim), GFP_ATOMIC); |
|
if (!claim) |
|
return; |
|
|
|
ether_addr_copy(claim->addr, mac); |
|
spin_lock_init(&claim->backbone_lock); |
|
claim->vid = vid; |
|
claim->lasttime = jiffies; |
|
kref_get(&backbone_gw->refcount); |
|
claim->backbone_gw = backbone_gw; |
|
kref_init(&claim->refcount); |
|
|
|
batadv_dbg(BATADV_DBG_BLA, bat_priv, |
|
"%s(): adding new entry %pM, vid %d to hash ...\n", |
|
__func__, mac, batadv_print_vid(vid)); |
|
|
|
kref_get(&claim->refcount); |
|
hash_added = batadv_hash_add(bat_priv->bla.claim_hash, |
|
batadv_compare_claim, |
|
batadv_choose_claim, claim, |
|
&claim->hash_entry); |
|
|
|
if (unlikely(hash_added != 0)) { |
|
/* only local changes happened. */ |
|
kfree(claim); |
|
return; |
|
} |
|
} else { |
|
claim->lasttime = jiffies; |
|
if (claim->backbone_gw == backbone_gw) |
|
/* no need to register a new backbone */ |
|
goto claim_free_ref; |
|
|
|
batadv_dbg(BATADV_DBG_BLA, bat_priv, |
|
"%s(): changing ownership for %pM, vid %d to gw %pM\n", |
|
__func__, mac, batadv_print_vid(vid), |
|
backbone_gw->orig); |
|
|
|
remove_crc = true; |
|
} |
|
|
|
/* replace backbone_gw atomically and adjust reference counters */ |
|
spin_lock_bh(&claim->backbone_lock); |
|
old_backbone_gw = claim->backbone_gw; |
|
kref_get(&backbone_gw->refcount); |
|
claim->backbone_gw = backbone_gw; |
|
spin_unlock_bh(&claim->backbone_lock); |
|
|
|
if (remove_crc) { |
|
/* remove claim address from old backbone_gw */ |
|
spin_lock_bh(&old_backbone_gw->crc_lock); |
|
old_backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); |
|
spin_unlock_bh(&old_backbone_gw->crc_lock); |
|
} |
|
|
|
batadv_backbone_gw_put(old_backbone_gw); |
|
|
|
/* add claim address to new backbone_gw */ |
|
spin_lock_bh(&backbone_gw->crc_lock); |
|
backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); |
|
spin_unlock_bh(&backbone_gw->crc_lock); |
|
backbone_gw->lasttime = jiffies; |
|
|
|
claim_free_ref: |
|
batadv_claim_put(claim); |
|
} |
|
|
|
/** |
|
* batadv_bla_claim_get_backbone_gw() - Get valid reference for backbone_gw of |
|
* claim |
|
* @claim: claim whose backbone_gw should be returned |
|
* |
|
* Return: valid reference to claim::backbone_gw |
|
*/ |
|
static struct batadv_bla_backbone_gw * |
|
batadv_bla_claim_get_backbone_gw(struct batadv_bla_claim *claim) |
|
{ |
|
struct batadv_bla_backbone_gw *backbone_gw; |
|
|
|
spin_lock_bh(&claim->backbone_lock); |
|
backbone_gw = claim->backbone_gw; |
|
kref_get(&backbone_gw->refcount); |
|
spin_unlock_bh(&claim->backbone_lock); |
|
|
|
return backbone_gw; |
|
} |
|
|
|
/** |
|
* batadv_bla_del_claim() - delete a claim from the claim hash |
|
* @bat_priv: the bat priv with all the soft interface information |
|
* @mac: mac address of the claim to be removed |
|
* @vid: VLAN id for the claim to be removed |
|
*/ |
|
static void batadv_bla_del_claim(struct batadv_priv *bat_priv, |
|
const u8 *mac, const unsigned short vid) |
|
{ |
|
struct batadv_bla_claim search_claim, *claim; |
|
struct batadv_bla_claim *claim_removed_entry; |
|
struct hlist_node *claim_removed_node; |
|
|
|
ether_addr_copy(search_claim.addr, mac); |
|
search_claim.vid = vid; |
|
claim = batadv_claim_hash_find(bat_priv, &search_claim); |
|
if (!claim) |
|
return; |
|
|
|
batadv_dbg(BATADV_DBG_BLA, bat_priv, "%s(): %pM, vid %d\n", __func__, |
|
mac, batadv_print_vid(vid)); |
|
|
|
claim_removed_node = batadv_hash_remove(bat_priv->bla.claim_hash, |
|
batadv_compare_claim, |
|
batadv_choose_claim, claim); |
|
if (!claim_removed_node) |
|
goto free_claim; |
|
|
|
/* reference from the hash is gone */ |
|
claim_removed_entry = hlist_entry(claim_removed_node, |
|
struct batadv_bla_claim, hash_entry); |
|
batadv_claim_put(claim_removed_entry); |
|
|
|
free_claim: |
|
/* don't need the reference from hash_find() anymore */ |
|
batadv_claim_put(claim); |
|
} |
|
|
|
/** |
|
* batadv_handle_announce() - check for ANNOUNCE frame |
|
* @bat_priv: the bat priv with all the soft interface information |
|
* @an_addr: announcement mac address (ARP Sender HW address) |
|
* @backbone_addr: originator address of the sender (Ethernet source MAC) |
|
* @vid: the VLAN ID of the frame |
|
* |
|
* Return: true if handled |
|
*/ |
|
static bool batadv_handle_announce(struct batadv_priv *bat_priv, u8 *an_addr, |
|
u8 *backbone_addr, unsigned short vid) |
|
{ |
|
struct batadv_bla_backbone_gw *backbone_gw; |
|
u16 backbone_crc, crc; |
|
|
|
if (memcmp(an_addr, batadv_announce_mac, 4) != 0) |
|
return false; |
|
|
|
backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid, |
|
false); |
|
|
|
if (unlikely(!backbone_gw)) |
|
return true; |
|
|
|
/* handle as ANNOUNCE frame */ |
|
backbone_gw->lasttime = jiffies; |
|
crc = ntohs(*((__force __be16 *)(&an_addr[4]))); |
|
|
|
batadv_dbg(BATADV_DBG_BLA, bat_priv, |
|
"%s(): ANNOUNCE vid %d (sent by %pM)... CRC = %#.4x\n", |
|
__func__, batadv_print_vid(vid), backbone_gw->orig, crc); |
|
|
|
spin_lock_bh(&backbone_gw->crc_lock); |
|
backbone_crc = backbone_gw->crc; |
|
spin_unlock_bh(&backbone_gw->crc_lock); |
|
|
|
if (backbone_crc != crc) { |
|
batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
|
"%s(): CRC FAILED for %pM/%d (my = %#.4x, sent = %#.4x)\n", |
|
__func__, backbone_gw->orig, |
|
batadv_print_vid(backbone_gw->vid), |
|
backbone_crc, crc); |
|
|
|
batadv_bla_send_request(backbone_gw); |
|
} else { |
|
/* if we have sent a request and the crc was OK, |
|
* we can allow traffic again. |
|
*/ |
|
if (atomic_read(&backbone_gw->request_sent)) { |
|
atomic_dec(&backbone_gw->bat_priv->bla.num_requests); |
|
atomic_set(&backbone_gw->request_sent, 0); |
|
} |
|
} |
|
|
|
batadv_backbone_gw_put(backbone_gw); |
|
return true; |
|
} |
|
|
|
/** |
|
* batadv_handle_request() - check for REQUEST frame |
|
* @bat_priv: the bat priv with all the soft interface information |
|
* @primary_if: the primary hard interface of this batman soft interface |
|
* @backbone_addr: backbone address to be requested (ARP sender HW MAC) |
|
* @ethhdr: ethernet header of a packet |
|
* @vid: the VLAN ID of the frame |
|
* |
|
* Return: true if handled |
|
*/ |
|
static bool batadv_handle_request(struct batadv_priv *bat_priv, |
|
struct batadv_hard_iface *primary_if, |
|
u8 *backbone_addr, struct ethhdr *ethhdr, |
|
unsigned short vid) |
|
{ |
|
/* check for REQUEST frame */ |
|
if (!batadv_compare_eth(backbone_addr, ethhdr->h_dest)) |
|
return false; |
|
|
|
/* sanity check, this should not happen on a normal switch, |
|
* we ignore it in this case. |
|
*/ |
|
if (!batadv_compare_eth(ethhdr->h_dest, primary_if->net_dev->dev_addr)) |
|
return true; |
|
|
|
batadv_dbg(BATADV_DBG_BLA, bat_priv, |
|
"%s(): REQUEST vid %d (sent by %pM)...\n", |
|
__func__, batadv_print_vid(vid), ethhdr->h_source); |
|
|
|
batadv_bla_answer_request(bat_priv, primary_if, vid); |
|
return true; |
|
} |
|
|
|
/** |
|
* batadv_handle_unclaim() - check for UNCLAIM frame |
|
* @bat_priv: the bat priv with all the soft interface information |
|
* @primary_if: the primary hard interface of this batman soft interface |
|
* @backbone_addr: originator address of the backbone (Ethernet source) |
|
* @claim_addr: Client to be unclaimed (ARP sender HW MAC) |
|
* @vid: the VLAN ID of the frame |
|
* |
|
* Return: true if handled |
|
*/ |
|
static bool batadv_handle_unclaim(struct batadv_priv *bat_priv, |
|
struct batadv_hard_iface *primary_if, |
|
u8 *backbone_addr, u8 *claim_addr, |
|
unsigned short vid) |
|
{ |
|
struct batadv_bla_backbone_gw *backbone_gw; |
|
|
|
/* unclaim in any case if it is our own */ |
|
if (primary_if && batadv_compare_eth(backbone_addr, |
|
primary_if->net_dev->dev_addr)) |
|
batadv_bla_send_claim(bat_priv, claim_addr, vid, |
|
BATADV_CLAIM_TYPE_UNCLAIM); |
|
|
|
backbone_gw = batadv_backbone_hash_find(bat_priv, backbone_addr, vid); |
|
|
|
if (!backbone_gw) |
|
return true; |
|
|
|
/* this must be an UNCLAIM frame */ |
|
batadv_dbg(BATADV_DBG_BLA, bat_priv, |
|
"%s(): UNCLAIM %pM on vid %d (sent by %pM)...\n", __func__, |
|
claim_addr, batadv_print_vid(vid), backbone_gw->orig); |
|
|
|
batadv_bla_del_claim(bat_priv, claim_addr, vid); |
|
batadv_backbone_gw_put(backbone_gw); |
|
return true; |
|
} |
|
|
|
/** |
|
* batadv_handle_claim() - check for CLAIM frame |
|
* @bat_priv: the bat priv with all the soft interface information |
|
* @primary_if: the primary hard interface of this batman soft interface |
|
* @backbone_addr: originator address of the backbone (Ethernet Source) |
|
* @claim_addr: client mac address to be claimed (ARP sender HW MAC) |
|
* @vid: the VLAN ID of the frame |
|
* |
|
* Return: true if handled |
|
*/ |
|
static bool batadv_handle_claim(struct batadv_priv *bat_priv, |
|
struct batadv_hard_iface *primary_if, |
|
u8 *backbone_addr, u8 *claim_addr, |
|
unsigned short vid) |
|
{ |
|
struct batadv_bla_backbone_gw *backbone_gw; |
|
|
|
/* register the gateway if not yet available, and add the claim. */ |
|
|
|
backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid, |
|
false); |
|
|
|
if (unlikely(!backbone_gw)) |
|
return true; |
|
|
|
/* this must be a CLAIM frame */ |
|
batadv_bla_add_claim(bat_priv, claim_addr, vid, backbone_gw); |
|
if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr)) |
|
batadv_bla_send_claim(bat_priv, claim_addr, vid, |
|
BATADV_CLAIM_TYPE_CLAIM); |
|
|
|
/* TODO: we could call something like tt_local_del() here. */ |
|
|
|
batadv_backbone_gw_put(backbone_gw); |
|
return true; |
|
} |
|
|
|
/** |
|
* batadv_check_claim_group() - check for claim group membership |
|
* @bat_priv: the bat priv with all the soft interface information |
|
* @primary_if: the primary interface of this batman interface |
|
* @hw_src: the Hardware source in the ARP Header |
|
* @hw_dst: the Hardware destination in the ARP Header |
|
* @ethhdr: pointer to the Ethernet header of the claim frame |
|
* |
|
* checks if it is a claim packet and if it's on the same group. |
|
* This function also applies the group ID of the sender |
|
* if it is in the same mesh. |
|
* |
|
* Return: |
|
* 2 - if it is a claim packet and on the same group |
|
* 1 - if is a claim packet from another group |
|
* 0 - if it is not a claim packet |
|
*/ |
|
static int batadv_check_claim_group(struct batadv_priv *bat_priv, |
|
struct batadv_hard_iface *primary_if, |
|
u8 *hw_src, u8 *hw_dst, |
|
struct ethhdr *ethhdr) |
|
{ |
|
u8 *backbone_addr; |
|
struct batadv_orig_node *orig_node; |
|
struct batadv_bla_claim_dst *bla_dst, *bla_dst_own; |
|
|
|
bla_dst = (struct batadv_bla_claim_dst *)hw_dst; |
|
bla_dst_own = &bat_priv->bla.claim_dest; |
|
|
|
/* if announcement packet, use the source, |
|
* otherwise assume it is in the hw_src |
|
*/ |
|
switch (bla_dst->type) { |
|
case BATADV_CLAIM_TYPE_CLAIM: |
|
backbone_addr = hw_src; |
|
break; |
|
case BATADV_CLAIM_TYPE_REQUEST: |
|
case BATADV_CLAIM_TYPE_ANNOUNCE: |
|
case BATADV_CLAIM_TYPE_UNCLAIM: |
|
backbone_addr = ethhdr->h_source; |
|
break; |
|
default: |
|
return 0; |
|
} |
|
|
|
/* don't accept claim frames from ourselves */ |
|
if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr)) |
|
return 0; |
|
|
|
/* if its already the same group, it is fine. */ |
|
if (bla_dst->group == bla_dst_own->group) |
|
return 2; |
|
|
|
/* lets see if this originator is in our mesh */ |
|
orig_node = batadv_orig_hash_find(bat_priv, backbone_addr); |
|
|
|
/* dont accept claims from gateways which are not in |
|
* the same mesh or group. |
|
*/ |
|
if (!orig_node) |
|
return 1; |
|
|
|
/* if our mesh friends mac is bigger, use it for ourselves. */ |
|
if (ntohs(bla_dst->group) > ntohs(bla_dst_own->group)) { |
|
batadv_dbg(BATADV_DBG_BLA, bat_priv, |
|
"taking other backbones claim group: %#.4x\n", |
|
ntohs(bla_dst->group)); |
|
bla_dst_own->group = bla_dst->group; |
|
} |
|
|
|
batadv_orig_node_put(orig_node); |
|
|
|
return 2; |
|
} |
|
|
|
/** |
|
* batadv_bla_process_claim() - Check if this is a claim frame, and process it |
|
* @bat_priv: the bat priv with all the soft interface information |
|
* @primary_if: the primary hard interface of this batman soft interface |
|
* @skb: the frame to be checked |
|
* |
|
* Return: true if it was a claim frame, otherwise return false to |
|
* tell the callee that it can use the frame on its own. |
|
*/ |
|
static bool batadv_bla_process_claim(struct batadv_priv *bat_priv, |
|
struct batadv_hard_iface *primary_if, |
|
struct sk_buff *skb) |
|
{ |
|
struct batadv_bla_claim_dst *bla_dst, *bla_dst_own; |
|
u8 *hw_src, *hw_dst; |
|
struct vlan_hdr *vhdr, vhdr_buf; |
|
struct ethhdr *ethhdr; |
|
struct arphdr *arphdr; |
|
unsigned short vid; |
|
int vlan_depth = 0; |
|
__be16 proto; |
|
int headlen; |
|
int ret; |
|
|
|
vid = batadv_get_vid(skb, 0); |
|
ethhdr = eth_hdr(skb); |
|
|
|
proto = ethhdr->h_proto; |
|
headlen = ETH_HLEN; |
|
if (vid & BATADV_VLAN_HAS_TAG) { |
|
/* Traverse the VLAN/Ethertypes. |
|
* |
|
* At this point it is known that the first protocol is a VLAN |
|
* header, so start checking at the encapsulated protocol. |
|
* |
|
* The depth of the VLAN headers is recorded to drop BLA claim |
|
* frames encapsulated into multiple VLAN headers (QinQ). |
|
*/ |
|
do { |
|
vhdr = skb_header_pointer(skb, headlen, VLAN_HLEN, |
|
&vhdr_buf); |
|
if (!vhdr) |
|
return false; |
|
|
|
proto = vhdr->h_vlan_encapsulated_proto; |
|
headlen += VLAN_HLEN; |
|
vlan_depth++; |
|
} while (proto == htons(ETH_P_8021Q)); |
|
} |
|
|
|
if (proto != htons(ETH_P_ARP)) |
|
return false; /* not a claim frame */ |
|
|
|
/* this must be a ARP frame. check if it is a claim. */ |
|
|
|
if (unlikely(!pskb_may_pull(skb, headlen + arp_hdr_len(skb->dev)))) |
|
return false; |
|
|
|
/* pskb_may_pull() may have modified the pointers, get ethhdr again */ |
|
ethhdr = eth_hdr(skb); |
|
arphdr = (struct arphdr *)((u8 *)ethhdr + headlen); |
|
|
|
/* Check whether the ARP frame carries a valid |
|
* IP information |
|
*/ |
|
if (arphdr->ar_hrd != htons(ARPHRD_ETHER)) |
|
return false; |
|
if (arphdr->ar_pro != htons(ETH_P_IP)) |
|
return false; |
|
if (arphdr->ar_hln != ETH_ALEN) |
|
return false; |
|
if (arphdr->ar_pln != 4) |
|
return false; |
|
|
|
hw_src = (u8 *)arphdr + sizeof(struct arphdr); |
|
hw_dst = hw_src + ETH_ALEN + 4; |
|
bla_dst = (struct batadv_bla_claim_dst *)hw_dst; |
|
bla_dst_own = &bat_priv->bla.claim_dest; |
|
|
|
/* check if it is a claim frame in general */ |
|
if (memcmp(bla_dst->magic, bla_dst_own->magic, |
|
sizeof(bla_dst->magic)) != 0) |
|
return false; |
|
|
|
/* check if there is a claim frame encapsulated deeper in (QinQ) and |
|
* drop that, as this is not supported by BLA but should also not be |
|
* sent via the mesh. |
|
*/ |
|
if (vlan_depth > 1) |
|
return true; |
|
|
|
/* Let the loopdetect frames on the mesh in any case. */ |
|
if (bla_dst->type == BATADV_CLAIM_TYPE_LOOPDETECT) |
|
return false; |
|
|
|
/* check if it is a claim frame. */ |
|
ret = batadv_check_claim_group(bat_priv, primary_if, hw_src, hw_dst, |
|
ethhdr); |
|
if (ret == 1) |
|
batadv_dbg(BATADV_DBG_BLA, bat_priv, |
|
"%s(): received a claim frame from another group. From: %pM on vid %d ...(hw_src %pM, hw_dst %pM)\n", |
|
__func__, ethhdr->h_source, batadv_print_vid(vid), |
|
hw_src, hw_dst); |
|
|
|
if (ret < 2) |
|
return !!ret; |
|
|
|
/* become a backbone gw ourselves on this vlan if not happened yet */ |
|
batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
|
|
|
/* check for the different types of claim frames ... */ |
|
switch (bla_dst->type) { |
|
case BATADV_CLAIM_TYPE_CLAIM: |
|
if (batadv_handle_claim(bat_priv, primary_if, hw_src, |
|
ethhdr->h_source, vid)) |
|
return true; |
|
break; |
|
case BATADV_CLAIM_TYPE_UNCLAIM: |
|
if (batadv_handle_unclaim(bat_priv, primary_if, |
|
ethhdr->h_source, hw_src, vid)) |
|
return true; |
|
break; |
|
|
|
case BATADV_CLAIM_TYPE_ANNOUNCE: |
|
if (batadv_handle_announce(bat_priv, hw_src, ethhdr->h_source, |
|
vid)) |
|
return true; |
|
break; |
|
case BATADV_CLAIM_TYPE_REQUEST: |
|
if (batadv_handle_request(bat_priv, primary_if, hw_src, ethhdr, |
|
vid)) |
|
return true; |
|
break; |
|
} |
|
|
|
batadv_dbg(BATADV_DBG_BLA, bat_priv, |
|
"%s(): ERROR - this looks like a claim frame, but is useless. eth src %pM on vid %d ...(hw_src %pM, hw_dst %pM)\n", |
|
__func__, ethhdr->h_source, batadv_print_vid(vid), hw_src, |
|
hw_dst); |
|
return true; |
|
} |
|
|
|
/** |
|
* batadv_bla_purge_backbone_gw() - Remove backbone gateways after a timeout or |
|
* immediately |
|
* @bat_priv: the bat priv with all the soft interface information |
|
* @now: whether the whole hash shall be wiped now |
|
* |
|
* Check when we last heard from other nodes, and remove them in case of |
|
* a time out, or clean all backbone gws if now is set. |
|
*/ |
|
static void batadv_bla_purge_backbone_gw(struct batadv_priv *bat_priv, int now) |
|
{ |
|
struct batadv_bla_backbone_gw *backbone_gw; |
|
struct hlist_node *node_tmp; |
|
struct hlist_head *head; |
|
struct batadv_hashtable *hash; |
|
spinlock_t *list_lock; /* protects write access to the hash lists */ |
|
int i; |
|
|
|
hash = bat_priv->bla.backbone_hash; |
|
if (!hash) |
|
return; |
|
|
|
for (i = 0; i < hash->size; i++) { |
|
head = &hash->table[i]; |
|
list_lock = &hash->list_locks[i]; |
|
|
|
spin_lock_bh(list_lock); |
|
hlist_for_each_entry_safe(backbone_gw, node_tmp, |
|
head, hash_entry) { |
|
if (now) |
|
goto purge_now; |
|
if (!batadv_has_timed_out(backbone_gw->lasttime, |
|
BATADV_BLA_BACKBONE_TIMEOUT)) |
|
continue; |
|
|
|
batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
|
"%s(): backbone gw %pM timed out\n", |
|
__func__, backbone_gw->orig); |
|
|
|
purge_now: |
|
/* don't wait for the pending request anymore */ |
|
if (atomic_read(&backbone_gw->request_sent)) |
|
atomic_dec(&bat_priv->bla.num_requests); |
|
|
|
batadv_bla_del_backbone_claims(backbone_gw); |
|
|
|
hlist_del_rcu(&backbone_gw->hash_entry); |
|
batadv_backbone_gw_put(backbone_gw); |
|
} |
|
spin_unlock_bh(list_lock); |
|
} |
|
} |
|
|
|
/** |
|
* batadv_bla_purge_claims() - Remove claims after a timeout or immediately |
|
* @bat_priv: the bat priv with all the soft interface information |
|
* @primary_if: the selected primary interface, may be NULL if now is set |
|
* @now: whether the whole hash shall be wiped now |
|
* |
|
* Check when we heard last time from our own claims, and remove them in case of |
|
* a time out, or clean all claims if now is set |
|
*/ |
|
static void batadv_bla_purge_claims(struct batadv_priv *bat_priv, |
|
struct batadv_hard_iface *primary_if, |
|
int now) |
|
{ |
|
struct batadv_bla_backbone_gw *backbone_gw; |
|
struct batadv_bla_claim *claim; |
|
struct hlist_head *head; |
|
struct batadv_hashtable *hash; |
|
int i; |
|
|
|
hash = bat_priv->bla.claim_hash; |
|
if (!hash) |
|
return; |
|
|
|
for (i = 0; i < hash->size; i++) { |
|
head = &hash->table[i]; |
|
|
|
rcu_read_lock(); |
|
hlist_for_each_entry_rcu(claim, head, hash_entry) { |
|
backbone_gw = batadv_bla_claim_get_backbone_gw(claim); |
|
if (now) |
|
goto purge_now; |
|
|
|
if (!batadv_compare_eth(backbone_gw->orig, |
|
primary_if->net_dev->dev_addr)) |
|
goto skip; |
|
|
|
if (!batadv_has_timed_out(claim->lasttime, |
|
BATADV_BLA_CLAIM_TIMEOUT)) |
|
goto skip; |
|
|
|
batadv_dbg(BATADV_DBG_BLA, bat_priv, |
|
"%s(): timed out.\n", __func__); |
|
|
|
purge_now: |
|
batadv_dbg(BATADV_DBG_BLA, bat_priv, |
|
"%s(): %pM, vid %d\n", __func__, |
|
claim->addr, claim->vid); |
|
|
|
batadv_handle_unclaim(bat_priv, primary_if, |
|
backbone_gw->orig, |
|
claim->addr, claim->vid); |
|
skip: |
|
batadv_backbone_gw_put(backbone_gw); |
|
} |
|
rcu_read_unlock(); |
|
} |
|
} |
|
|
|
/** |
|
* batadv_bla_update_orig_address() - Update the backbone gateways when the own |
|
* originator address changes |
|
* @bat_priv: the bat priv with all the soft interface information |
|
* @primary_if: the new selected primary_if |
|
* @oldif: the old primary interface, may be NULL |
|
*/ |
|
void batadv_bla_update_orig_address(struct batadv_priv *bat_priv, |
|
struct batadv_hard_iface *primary_if, |
|
struct batadv_hard_iface *oldif) |
|
{ |
|
struct batadv_bla_backbone_gw *backbone_gw; |
|
struct hlist_head *head; |
|
struct batadv_hashtable *hash; |
|
__be16 group; |
|
int i; |
|
|
|
/* reset bridge loop avoidance group id */ |
|
group = htons(crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN)); |
|
bat_priv->bla.claim_dest.group = group; |
|
|
|
/* purge everything when bridge loop avoidance is turned off */ |
|
if (!atomic_read(&bat_priv->bridge_loop_avoidance)) |
|
oldif = NULL; |
|
|
|
if (!oldif) { |
|
batadv_bla_purge_claims(bat_priv, NULL, 1); |
|
batadv_bla_purge_backbone_gw(bat_priv, 1); |
|
return; |
|
} |
|
|
|
hash = bat_priv->bla.backbone_hash; |
|
if (!hash) |
|
return; |
|
|
|
for (i = 0; i < hash->size; i++) { |
|
head = &hash->table[i]; |
|
|
|
rcu_read_lock(); |
|
hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
|
/* own orig still holds the old value. */ |
|
if (!batadv_compare_eth(backbone_gw->orig, |
|
oldif->net_dev->dev_addr)) |
|
continue; |
|
|
|
ether_addr_copy(backbone_gw->orig, |
|
primary_if->net_dev->dev_addr); |
|
/* send an announce frame so others will ask for our |
|
* claims and update their tables. |
|
*/ |
|
batadv_bla_send_announce(bat_priv, backbone_gw); |
|
} |
|
rcu_read_unlock(); |
|
} |
|
} |
|
|
|
/** |
|
* 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 |
|
*/ |
|
void batadv_bla_status_update(struct net_device *net_dev) |
|
{ |
|
struct batadv_priv *bat_priv = netdev_priv(net_dev); |
|
struct batadv_hard_iface *primary_if; |
|
|
|
primary_if = batadv_primary_if_get_selected(bat_priv); |
|
if (!primary_if) |
|
return; |
|
|
|
/* this function already purges everything when bla is disabled, |
|
* so just call that one. |
|
*/ |
|
batadv_bla_update_orig_address(bat_priv, primary_if, primary_if); |
|
batadv_hardif_put(primary_if); |
|
} |
|
|
|
/** |
|
* batadv_bla_periodic_work() - performs periodic bla work |
|
* @work: kernel work struct |
|
* |
|
* periodic work to do: |
|
* * purge structures when they are too old |
|
* * send announcements |
|
*/ |
|
static void batadv_bla_periodic_work(struct work_struct *work) |
|
{ |
|
struct delayed_work *delayed_work; |
|
struct batadv_priv *bat_priv; |
|
struct batadv_priv_bla *priv_bla; |
|
struct hlist_head *head; |
|
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); |
|
priv_bla = container_of(delayed_work, struct batadv_priv_bla, work); |
|
bat_priv = container_of(priv_bla, struct batadv_priv, bla); |
|
primary_if = batadv_primary_if_get_selected(bat_priv); |
|
if (!primary_if) |
|
goto out; |
|
|
|
batadv_bla_purge_claims(bat_priv, primary_if, 0); |
|
batadv_bla_purge_backbone_gw(bat_priv, 0); |
|
|
|
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. |
|
*/ |
|
eth_random_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; |
|
|
|
for (i = 0; i < hash->size; i++) { |
|
head = &hash->table[i]; |
|
|
|
rcu_read_lock(); |
|
hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
|
if (!batadv_compare_eth(backbone_gw->orig, |
|
primary_if->net_dev->dev_addr)) |
|
continue; |
|
|
|
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 |
|
* in the backbone. |
|
* |
|
* We can reset this now after we waited some periods |
|
* to give bridge forward delays and bla group forming |
|
* some grace time. |
|
*/ |
|
|
|
if (atomic_read(&backbone_gw->request_sent) == 0) |
|
continue; |
|
|
|
if (!atomic_dec_and_test(&backbone_gw->wait_periods)) |
|
continue; |
|
|
|
atomic_dec(&backbone_gw->bat_priv->bla.num_requests); |
|
atomic_set(&backbone_gw->request_sent, 0); |
|
} |
|
rcu_read_unlock(); |
|
} |
|
out: |
|
if (primary_if) |
|
batadv_hardif_put(primary_if); |
|
|
|
queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work, |
|
msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH)); |
|
} |
|
|
|
/* The hash for claim and backbone hash receive the same key because they |
|
* are getting initialized by hash_new with the same key. Reinitializing |
|
* them with to different keys to allow nested locking without generating |
|
* lockdep warnings |
|
*/ |
|
static struct lock_class_key batadv_claim_hash_lock_class_key; |
|
static struct lock_class_key batadv_backbone_hash_lock_class_key; |
|
|
|
/** |
|
* batadv_bla_init() - initialize all bla structures |
|
* @bat_priv: the bat priv with all the soft interface information |
|
* |
|
* Return: 0 on success, < 0 on error. |
|
*/ |
|
int batadv_bla_init(struct batadv_priv *bat_priv) |
|
{ |
|
int i; |
|
u8 claim_dest[ETH_ALEN] = {0xff, 0x43, 0x05, 0x00, 0x00, 0x00}; |
|
struct batadv_hard_iface *primary_if; |
|
u16 crc; |
|
unsigned long entrytime; |
|
|
|
spin_lock_init(&bat_priv->bla.bcast_duplist_lock); |
|
|
|
batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hash registering\n"); |
|
|
|
/* setting claim destination address */ |
|
memcpy(&bat_priv->bla.claim_dest.magic, claim_dest, 3); |
|
bat_priv->bla.claim_dest.type = 0; |
|
primary_if = batadv_primary_if_get_selected(bat_priv); |
|
if (primary_if) { |
|
crc = crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN); |
|
bat_priv->bla.claim_dest.group = htons(crc); |
|
batadv_hardif_put(primary_if); |
|
} else { |
|
bat_priv->bla.claim_dest.group = 0; /* will be set later */ |
|
} |
|
|
|
/* initialize the duplicate list */ |
|
entrytime = jiffies - msecs_to_jiffies(BATADV_DUPLIST_TIMEOUT); |
|
for (i = 0; i < BATADV_DUPLIST_SIZE; i++) |
|
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; |
|
|
|
bat_priv->bla.claim_hash = batadv_hash_new(128); |
|
bat_priv->bla.backbone_hash = batadv_hash_new(32); |
|
|
|
if (!bat_priv->bla.claim_hash || !bat_priv->bla.backbone_hash) |
|
return -ENOMEM; |
|
|
|
batadv_hash_set_lock_class(bat_priv->bla.claim_hash, |
|
&batadv_claim_hash_lock_class_key); |
|
batadv_hash_set_lock_class(bat_priv->bla.backbone_hash, |
|
&batadv_backbone_hash_lock_class_key); |
|
|
|
batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hashes initialized\n"); |
|
|
|
INIT_DELAYED_WORK(&bat_priv->bla.work, batadv_bla_periodic_work); |
|
|
|
queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work, |
|
msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH)); |
|
return 0; |
|
} |
|
|
|
/** |
|
* batadv_bla_check_duplist() - Check if a frame is in the broadcast dup. |
|
* @bat_priv: the bat priv with all the soft interface information |
|
* @skb: contains the multicast packet to be checked |
|
* @payload_ptr: pointer to position inside the head buffer of the skb |
|
* marking the start of the data to be CRC'ed |
|
* @orig: originator mac address, NULL if unknown |
|
* |
|
* Check if it is on our broadcast list. Another gateway might have sent the |
|
* same packet because it is connected to the same backbone, so we have to |
|
* remove this duplicate. |
|
* |
|
* This is performed by checking the CRC, which will tell us |
|
* with a good chance that it is the same packet. If it is furthermore |
|
* sent by another host, drop it. We allow equal packets from |
|
* the same host however as this might be intended. |
|
* |
|
* Return: true if a packet is in the duplicate list, false otherwise. |
|
*/ |
|
static bool batadv_bla_check_duplist(struct batadv_priv *bat_priv, |
|
struct sk_buff *skb, u8 *payload_ptr, |
|
const u8 *orig) |
|
{ |
|
struct batadv_bcast_duplist_entry *entry; |
|
bool ret = false; |
|
int i, curr; |
|
__be32 crc; |
|
|
|
/* calculate the crc ... */ |
|
crc = batadv_skb_crc32(skb, payload_ptr); |
|
|
|
spin_lock_bh(&bat_priv->bla.bcast_duplist_lock); |
|
|
|
for (i = 0; i < BATADV_DUPLIST_SIZE; i++) { |
|
curr = (bat_priv->bla.bcast_duplist_curr + i); |
|
curr %= BATADV_DUPLIST_SIZE; |
|
entry = &bat_priv->bla.bcast_duplist[curr]; |
|
|
|
/* we can stop searching if the entry is too old ; |
|
* later entries will be even older |
|
*/ |
|
if (batadv_has_timed_out(entry->entrytime, |
|
BATADV_DUPLIST_TIMEOUT)) |
|
break; |
|
|
|
if (entry->crc != crc) |
|
continue; |
|
|
|
/* are the originators both known and not anonymous? */ |
|
if (orig && !is_zero_ether_addr(orig) && |
|
!is_zero_ether_addr(entry->orig)) { |
|
/* If known, check if the new frame came from |
|
* the same originator: |
|
* We are safe to take identical frames from the |
|
* same orig, if known, as multiplications in |
|
* the mesh are detected via the (orig, seqno) pair. |
|
* So we can be a bit more liberal here and allow |
|
* identical frames from the same orig which the source |
|
* host might have sent multiple times on purpose. |
|
*/ |
|
if (batadv_compare_eth(entry->orig, orig)) |
|
continue; |
|
} |
|
|
|
/* this entry seems to match: same crc, not too old, |
|
* and from another gw. therefore return true to forbid it. |
|
*/ |
|
ret = true; |
|
goto out; |
|
} |
|
/* not found, add a new entry (overwrite the oldest entry) |
|
* and allow it, its the first occurrence. |
|
*/ |
|
curr = (bat_priv->bla.bcast_duplist_curr + BATADV_DUPLIST_SIZE - 1); |
|
curr %= BATADV_DUPLIST_SIZE; |
|
entry = &bat_priv->bla.bcast_duplist[curr]; |
|
entry->crc = crc; |
|
entry->entrytime = jiffies; |
|
|
|
/* known originator */ |
|
if (orig) |
|
ether_addr_copy(entry->orig, orig); |
|
/* anonymous originator */ |
|
else |
|
eth_zero_addr(entry->orig); |
|
|
|
bat_priv->bla.bcast_duplist_curr = curr; |
|
|
|
out: |
|
spin_unlock_bh(&bat_priv->bla.bcast_duplist_lock); |
|
|
|
return ret; |
|
} |
|
|
|
/** |
|
* batadv_bla_check_ucast_duplist() - Check if a frame is in the broadcast dup. |
|
* @bat_priv: the bat priv with all the soft interface information |
|
* @skb: contains the multicast packet to be checked, decapsulated from a |
|
* unicast_packet |
|
* |
|
* Check if it is on our broadcast list. Another gateway might have sent the |
|
* same packet because it is connected to the same backbone, so we have to |
|
* remove this duplicate. |
|
* |
|
* Return: true if a packet is in the duplicate list, false otherwise. |
|
*/ |
|
static bool batadv_bla_check_ucast_duplist(struct batadv_priv *bat_priv, |
|
struct sk_buff *skb) |
|
{ |
|
return batadv_bla_check_duplist(bat_priv, skb, (u8 *)skb->data, NULL); |
|
} |
|
|
|
/** |
|
* batadv_bla_check_bcast_duplist() - Check if a frame is in the broadcast dup. |
|
* @bat_priv: the bat priv with all the soft interface information |
|
* @skb: contains the bcast_packet to be checked |
|
* |
|
* Check if it is on our broadcast list. Another gateway might have sent the |
|
* same packet because it is connected to the same backbone, so we have to |
|
* remove this duplicate. |
|
* |
|
* Return: true if a packet is in the duplicate list, false otherwise. |
|
*/ |
|
bool batadv_bla_check_bcast_duplist(struct batadv_priv *bat_priv, |
|
struct sk_buff *skb) |
|
{ |
|
struct batadv_bcast_packet *bcast_packet; |
|
u8 *payload_ptr; |
|
|
|
bcast_packet = (struct batadv_bcast_packet *)skb->data; |
|
payload_ptr = (u8 *)(bcast_packet + 1); |
|
|
|
return batadv_bla_check_duplist(bat_priv, skb, payload_ptr, |
|
bcast_packet->orig); |
|
} |
|
|
|
/** |
|
* batadv_bla_is_backbone_gw_orig() - Check if the originator is a gateway for |
|
* the VLAN identified by vid. |
|
* @bat_priv: the bat priv with all the soft interface information |
|
* @orig: originator mac address |
|
* @vid: VLAN identifier |
|
* |
|
* Return: true if orig is a backbone for this vid, false otherwise. |
|
*/ |
|
bool batadv_bla_is_backbone_gw_orig(struct batadv_priv *bat_priv, u8 *orig, |
|
unsigned short vid) |
|
{ |
|
struct batadv_hashtable *hash = bat_priv->bla.backbone_hash; |
|
struct hlist_head *head; |
|
struct batadv_bla_backbone_gw *backbone_gw; |
|
int i; |
|
|
|
if (!atomic_read(&bat_priv->bridge_loop_avoidance)) |
|
return false; |
|
|
|
if (!hash) |
|
return false; |
|
|
|
for (i = 0; i < hash->size; i++) { |
|
head = &hash->table[i]; |
|
|
|
rcu_read_lock(); |
|
hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
|
if (batadv_compare_eth(backbone_gw->orig, orig) && |
|
backbone_gw->vid == vid) { |
|
rcu_read_unlock(); |
|
return true; |
|
} |
|
} |
|
rcu_read_unlock(); |
|
} |
|
|
|
return false; |
|
} |
|
|
|
/** |
|
* batadv_bla_is_backbone_gw() - check if originator is a backbone gw for a VLAN |
|
* @skb: the frame to be checked |
|
* @orig_node: the orig_node of the frame |
|
* @hdr_size: maximum length of the frame |
|
* |
|
* Return: true if the orig_node is also a gateway on the soft interface, |
|
* otherwise it returns false. |
|
*/ |
|
bool batadv_bla_is_backbone_gw(struct sk_buff *skb, |
|
struct batadv_orig_node *orig_node, int hdr_size) |
|
{ |
|
struct batadv_bla_backbone_gw *backbone_gw; |
|
unsigned short vid; |
|
|
|
if (!atomic_read(&orig_node->bat_priv->bridge_loop_avoidance)) |
|
return false; |
|
|
|
/* first, find out the vid. */ |
|
if (!pskb_may_pull(skb, hdr_size + ETH_HLEN)) |
|
return false; |
|
|
|
vid = batadv_get_vid(skb, hdr_size); |
|
|
|
/* see if this originator is a backbone gw for this VLAN */ |
|
backbone_gw = batadv_backbone_hash_find(orig_node->bat_priv, |
|
orig_node->orig, vid); |
|
if (!backbone_gw) |
|
return false; |
|
|
|
batadv_backbone_gw_put(backbone_gw); |
|
return true; |
|
} |
|
|
|
/** |
|
* batadv_bla_free() - free all bla structures |
|
* @bat_priv: the bat priv with all the soft interface information |
|
* |
|
* for softinterface free or module unload |
|
*/ |
|
void batadv_bla_free(struct batadv_priv *bat_priv) |
|
{ |
|
struct batadv_hard_iface *primary_if; |
|
|
|
cancel_delayed_work_sync(&bat_priv->bla.work); |
|
primary_if = batadv_primary_if_get_selected(bat_priv); |
|
|
|
if (bat_priv->bla.claim_hash) { |
|
batadv_bla_purge_claims(bat_priv, primary_if, 1); |
|
batadv_hash_destroy(bat_priv->bla.claim_hash); |
|
bat_priv->bla.claim_hash = NULL; |
|
} |
|
if (bat_priv->bla.backbone_hash) { |
|
batadv_bla_purge_backbone_gw(bat_priv, 1); |
|
batadv_hash_destroy(bat_priv->bla.backbone_hash); |
|
bat_priv->bla.backbone_hash = NULL; |
|
} |
|
if (primary_if) |
|
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, |
|
* throws an uevent and logs 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; |
|
bool ret; |
|
|
|
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; |
|
|
|
ret = queue_work(batadv_event_workqueue, &backbone_gw->report_work); |
|
|
|
/* backbone_gw is unreferenced in the report work function |
|
* if queue_work() call was successful |
|
*/ |
|
if (!ret) |
|
batadv_backbone_gw_put(backbone_gw); |
|
|
|
return true; |
|
} |
|
|
|
/** |
|
* batadv_bla_rx() - check packets coming from the mesh. |
|
* @bat_priv: the bat priv with all the soft interface information |
|
* @skb: the frame to be checked |
|
* @vid: the VLAN ID of the frame |
|
* @packet_type: the batman packet type this frame came in |
|
* |
|
* batadv_bla_rx avoidance checks if: |
|
* * we have to race for a claim |
|
* * if the frame is allowed on the LAN |
|
* |
|
* In these cases, the skb is further handled by this function |
|
* |
|
* Return: true if handled, otherwise it returns false and the caller shall |
|
* further process the skb. |
|
*/ |
|
bool batadv_bla_rx(struct batadv_priv *bat_priv, struct sk_buff *skb, |
|
unsigned short vid, int packet_type) |
|
{ |
|
struct batadv_bla_backbone_gw *backbone_gw; |
|
struct ethhdr *ethhdr; |
|
struct batadv_bla_claim search_claim, *claim = NULL; |
|
struct batadv_hard_iface *primary_if; |
|
bool own_claim; |
|
bool ret; |
|
|
|
ethhdr = eth_hdr(skb); |
|
|
|
primary_if = batadv_primary_if_get_selected(bat_priv); |
|
if (!primary_if) |
|
goto handled; |
|
|
|
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 multicast packets while requests are in flight */ |
|
if (is_multicast_ether_addr(ethhdr->h_dest)) |
|
/* Both broadcast flooding or multicast-via-unicasts |
|
* delivery might send to multiple backbone gateways |
|
* sharing the same LAN and therefore need to coordinate |
|
* which backbone gateway forwards into the LAN, |
|
* by claiming the payload source address. |
|
* |
|
* Broadcast flooding and multicast-via-unicasts |
|
* delivery use the following two batman packet types. |
|
* Note: explicitly exclude BATADV_UNICAST_4ADDR, |
|
* as the DHCP gateway feature will send explicitly |
|
* to only one BLA gateway, so the claiming process |
|
* should be avoided there. |
|
*/ |
|
if (packet_type == BATADV_BCAST || |
|
packet_type == BATADV_UNICAST) |
|
goto handled; |
|
|
|
/* potential duplicates from foreign BLA backbone gateways via |
|
* multicast-in-unicast packets |
|
*/ |
|
if (is_multicast_ether_addr(ethhdr->h_dest) && |
|
packet_type == BATADV_UNICAST && |
|
batadv_bla_check_ucast_duplist(bat_priv, skb)) |
|
goto handled; |
|
|
|
ether_addr_copy(search_claim.addr, ethhdr->h_source); |
|
search_claim.vid = vid; |
|
claim = batadv_claim_hash_find(bat_priv, &search_claim); |
|
|
|
if (!claim) { |
|
/* possible optimization: race for a claim */ |
|
/* No claim exists yet, claim it for us! |
|
*/ |
|
|
|
batadv_dbg(BATADV_DBG_BLA, bat_priv, |
|
"%s(): Unclaimed MAC %pM found. Claim it. Local: %s\n", |
|
__func__, ethhdr->h_source, |
|
batadv_is_my_client(bat_priv, |
|
ethhdr->h_source, vid) ? |
|
"yes" : "no"); |
|
batadv_handle_claim(bat_priv, primary_if, |
|
primary_if->net_dev->dev_addr, |
|
ethhdr->h_source, vid); |
|
goto allow; |
|
} |
|
|
|
/* if it is our own claim ... */ |
|
backbone_gw = batadv_bla_claim_get_backbone_gw(claim); |
|
own_claim = batadv_compare_eth(backbone_gw->orig, |
|
primary_if->net_dev->dev_addr); |
|
batadv_backbone_gw_put(backbone_gw); |
|
|
|
if (own_claim) { |
|
/* ... allow it in any case */ |
|
claim->lasttime = jiffies; |
|
goto allow; |
|
} |
|
|
|
/* if it is a multicast ... */ |
|
if (is_multicast_ether_addr(ethhdr->h_dest) && |
|
(packet_type == BATADV_BCAST || packet_type == BATADV_UNICAST)) { |
|
/* ... drop it. the responsible gateway is in charge. |
|
* |
|
* We need to check packet type because with the gateway |
|
* feature, broadcasts (like DHCP requests) may be sent |
|
* using a unicast 4 address packet type. See comment above. |
|
*/ |
|
goto handled; |
|
} else { |
|
/* seems the client considers us as its best gateway. |
|
* send a claim and update the claim table |
|
* immediately. |
|
*/ |
|
batadv_handle_claim(bat_priv, primary_if, |
|
primary_if->net_dev->dev_addr, |
|
ethhdr->h_source, vid); |
|
goto allow; |
|
} |
|
allow: |
|
batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
|
ret = false; |
|
goto out; |
|
|
|
handled: |
|
kfree_skb(skb); |
|
ret = true; |
|
|
|
out: |
|
if (primary_if) |
|
batadv_hardif_put(primary_if); |
|
if (claim) |
|
batadv_claim_put(claim); |
|
return ret; |
|
} |
|
|
|
/** |
|
* batadv_bla_tx() - check packets going into the mesh |
|
* @bat_priv: the bat priv with all the soft interface information |
|
* @skb: the frame to be checked |
|
* @vid: the VLAN ID of the frame |
|
* |
|
* batadv_bla_tx checks if: |
|
* * a claim was received which has to be processed |
|
* * the frame is allowed on the mesh |
|
* |
|
* in these cases, the skb is further handled by this function. |
|
* |
|
* This call might reallocate skb data. |
|
* |
|
* Return: true if handled, otherwise it returns false and the caller shall |
|
* further process the skb. |
|
*/ |
|
bool batadv_bla_tx(struct batadv_priv *bat_priv, struct sk_buff *skb, |
|
unsigned short vid) |
|
{ |
|
struct ethhdr *ethhdr; |
|
struct batadv_bla_claim search_claim, *claim = NULL; |
|
struct batadv_bla_backbone_gw *backbone_gw; |
|
struct batadv_hard_iface *primary_if; |
|
bool client_roamed; |
|
bool ret = false; |
|
|
|
primary_if = batadv_primary_if_get_selected(bat_priv); |
|
if (!primary_if) |
|
goto out; |
|
|
|
if (!atomic_read(&bat_priv->bridge_loop_avoidance)) |
|
goto allow; |
|
|
|
if (batadv_bla_process_claim(bat_priv, primary_if, skb)) |
|
goto handled; |
|
|
|
ethhdr = eth_hdr(skb); |
|
|
|
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)) |
|
goto handled; |
|
|
|
ether_addr_copy(search_claim.addr, ethhdr->h_source); |
|
search_claim.vid = vid; |
|
|
|
claim = batadv_claim_hash_find(bat_priv, &search_claim); |
|
|
|
/* if no claim exists, allow it. */ |
|
if (!claim) |
|
goto allow; |
|
|
|
/* check if we are responsible. */ |
|
backbone_gw = batadv_bla_claim_get_backbone_gw(claim); |
|
client_roamed = batadv_compare_eth(backbone_gw->orig, |
|
primary_if->net_dev->dev_addr); |
|
batadv_backbone_gw_put(backbone_gw); |
|
|
|
if (client_roamed) { |
|
/* if yes, the client has roamed and we have |
|
* to unclaim it. |
|
*/ |
|
if (batadv_has_timed_out(claim->lasttime, 100)) { |
|
/* only unclaim if the last claim entry is |
|
* older than 100 ms to make sure we really |
|
* have a roaming client here. |
|
*/ |
|
batadv_dbg(BATADV_DBG_BLA, bat_priv, "%s(): Roaming client %pM detected. Unclaim it.\n", |
|
__func__, ethhdr->h_source); |
|
batadv_handle_unclaim(bat_priv, primary_if, |
|
primary_if->net_dev->dev_addr, |
|
ethhdr->h_source, vid); |
|
goto allow; |
|
} else { |
|
batadv_dbg(BATADV_DBG_BLA, bat_priv, "%s(): Race for claim %pM detected. Drop packet.\n", |
|
__func__, ethhdr->h_source); |
|
goto handled; |
|
} |
|
} |
|
|
|
/* check if it is a multicast/broadcast frame */ |
|
if (is_multicast_ether_addr(ethhdr->h_dest)) { |
|
/* drop it. the responsible gateway has forwarded it into |
|
* the backbone network. |
|
*/ |
|
goto handled; |
|
} else { |
|
/* we must allow it. at least if we are |
|
* responsible for the DESTINATION. |
|
*/ |
|
goto allow; |
|
} |
|
allow: |
|
batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
|
ret = false; |
|
goto out; |
|
handled: |
|
ret = true; |
|
out: |
|
if (primary_if) |
|
batadv_hardif_put(primary_if); |
|
if (claim) |
|
batadv_claim_put(claim); |
|
return ret; |
|
} |
|
|
|
/** |
|
* batadv_bla_claim_dump_entry() - dump one entry of the claim table |
|
* to a netlink socket |
|
* @msg: buffer for the message |
|
* @portid: netlink port |
|
* @cb: Control block containing additional options |
|
* @primary_if: primary interface |
|
* @claim: entry to dump |
|
* |
|
* Return: 0 or error code. |
|
*/ |
|
static int |
|
batadv_bla_claim_dump_entry(struct sk_buff *msg, u32 portid, |
|
struct netlink_callback *cb, |
|
struct batadv_hard_iface *primary_if, |
|
struct batadv_bla_claim *claim) |
|
{ |
|
u8 *primary_addr = primary_if->net_dev->dev_addr; |
|
u16 backbone_crc; |
|
bool is_own; |
|
void *hdr; |
|
int ret = -EINVAL; |
|
|
|
hdr = genlmsg_put(msg, portid, cb->nlh->nlmsg_seq, |
|
&batadv_netlink_family, NLM_F_MULTI, |
|
BATADV_CMD_GET_BLA_CLAIM); |
|
if (!hdr) { |
|
ret = -ENOBUFS; |
|
goto out; |
|
} |
|
|
|
genl_dump_check_consistent(cb, hdr); |
|
|
|
is_own = batadv_compare_eth(claim->backbone_gw->orig, |
|
primary_addr); |
|
|
|
spin_lock_bh(&claim->backbone_gw->crc_lock); |
|
backbone_crc = claim->backbone_gw->crc; |
|
spin_unlock_bh(&claim->backbone_gw->crc_lock); |
|
|
|
if (is_own) |
|
if (nla_put_flag(msg, BATADV_ATTR_BLA_OWN)) { |
|
genlmsg_cancel(msg, hdr); |
|
goto out; |
|
} |
|
|
|
if (nla_put(msg, BATADV_ATTR_BLA_ADDRESS, ETH_ALEN, claim->addr) || |
|
nla_put_u16(msg, BATADV_ATTR_BLA_VID, claim->vid) || |
|
nla_put(msg, BATADV_ATTR_BLA_BACKBONE, ETH_ALEN, |
|
claim->backbone_gw->orig) || |
|
nla_put_u16(msg, BATADV_ATTR_BLA_CRC, |
|
backbone_crc)) { |
|
genlmsg_cancel(msg, hdr); |
|
goto out; |
|
} |
|
|
|
genlmsg_end(msg, hdr); |
|
ret = 0; |
|
|
|
out: |
|
return ret; |
|
} |
|
|
|
/** |
|
* batadv_bla_claim_dump_bucket() - dump one bucket of the claim table |
|
* to a netlink socket |
|
* @msg: buffer for the message |
|
* @portid: netlink port |
|
* @cb: Control block containing additional options |
|
* @primary_if: primary interface |
|
* @hash: hash to dump |
|
* @bucket: bucket index to dump |
|
* @idx_skip: How many entries to skip |
|
* |
|
* Return: always 0. |
|
*/ |
|
static int |
|
batadv_bla_claim_dump_bucket(struct sk_buff *msg, u32 portid, |
|
struct netlink_callback *cb, |
|
struct batadv_hard_iface *primary_if, |
|
struct batadv_hashtable *hash, unsigned int bucket, |
|
int *idx_skip) |
|
{ |
|
struct batadv_bla_claim *claim; |
|
int idx = 0; |
|
int ret = 0; |
|
|
|
spin_lock_bh(&hash->list_locks[bucket]); |
|
cb->seq = atomic_read(&hash->generation) << 1 | 1; |
|
|
|
hlist_for_each_entry(claim, &hash->table[bucket], hash_entry) { |
|
if (idx++ < *idx_skip) |
|
continue; |
|
|
|
ret = batadv_bla_claim_dump_entry(msg, portid, cb, |
|
primary_if, claim); |
|
if (ret) { |
|
*idx_skip = idx - 1; |
|
goto unlock; |
|
} |
|
} |
|
|
|
*idx_skip = 0; |
|
unlock: |
|
spin_unlock_bh(&hash->list_locks[bucket]); |
|
return ret; |
|
} |
|
|
|
/** |
|
* batadv_bla_claim_dump() - dump claim table to a netlink socket |
|
* @msg: buffer for the message |
|
* @cb: callback structure containing arguments |
|
* |
|
* Return: message length. |
|
*/ |
|
int batadv_bla_claim_dump(struct sk_buff *msg, struct netlink_callback *cb) |
|
{ |
|
struct batadv_hard_iface *primary_if = NULL; |
|
int portid = NETLINK_CB(cb->skb).portid; |
|
struct net *net = sock_net(cb->skb->sk); |
|
struct net_device *soft_iface; |
|
struct batadv_hashtable *hash; |
|
struct batadv_priv *bat_priv; |
|
int bucket = cb->args[0]; |
|
int idx = cb->args[1]; |
|
int ifindex; |
|
int ret = 0; |
|
|
|
ifindex = batadv_netlink_get_ifindex(cb->nlh, |
|
BATADV_ATTR_MESH_IFINDEX); |
|
if (!ifindex) |
|
return -EINVAL; |
|
|
|
soft_iface = dev_get_by_index(net, ifindex); |
|
if (!soft_iface || !batadv_softif_is_valid(soft_iface)) { |
|
ret = -ENODEV; |
|
goto out; |
|
} |
|
|
|
bat_priv = netdev_priv(soft_iface); |
|
hash = bat_priv->bla.claim_hash; |
|
|
|
primary_if = batadv_primary_if_get_selected(bat_priv); |
|
if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) { |
|
ret = -ENOENT; |
|
goto out; |
|
} |
|
|
|
while (bucket < hash->size) { |
|
if (batadv_bla_claim_dump_bucket(msg, portid, cb, primary_if, |
|
hash, bucket, &idx)) |
|
break; |
|
bucket++; |
|
} |
|
|
|
cb->args[0] = bucket; |
|
cb->args[1] = idx; |
|
|
|
ret = msg->len; |
|
|
|
out: |
|
if (primary_if) |
|
batadv_hardif_put(primary_if); |
|
|
|
if (soft_iface) |
|
dev_put(soft_iface); |
|
|
|
return ret; |
|
} |
|
|
|
/** |
|
* batadv_bla_backbone_dump_entry() - dump one entry of the backbone table to a |
|
* netlink socket |
|
* @msg: buffer for the message |
|
* @portid: netlink port |
|
* @cb: Control block containing additional options |
|
* @primary_if: primary interface |
|
* @backbone_gw: entry to dump |
|
* |
|
* Return: 0 or error code. |
|
*/ |
|
static int |
|
batadv_bla_backbone_dump_entry(struct sk_buff *msg, u32 portid, |
|
struct netlink_callback *cb, |
|
struct batadv_hard_iface *primary_if, |
|
struct batadv_bla_backbone_gw *backbone_gw) |
|
{ |
|
u8 *primary_addr = primary_if->net_dev->dev_addr; |
|
u16 backbone_crc; |
|
bool is_own; |
|
int msecs; |
|
void *hdr; |
|
int ret = -EINVAL; |
|
|
|
hdr = genlmsg_put(msg, portid, cb->nlh->nlmsg_seq, |
|
&batadv_netlink_family, NLM_F_MULTI, |
|
BATADV_CMD_GET_BLA_BACKBONE); |
|
if (!hdr) { |
|
ret = -ENOBUFS; |
|
goto out; |
|
} |
|
|
|
genl_dump_check_consistent(cb, hdr); |
|
|
|
is_own = batadv_compare_eth(backbone_gw->orig, primary_addr); |
|
|
|
spin_lock_bh(&backbone_gw->crc_lock); |
|
backbone_crc = backbone_gw->crc; |
|
spin_unlock_bh(&backbone_gw->crc_lock); |
|
|
|
msecs = jiffies_to_msecs(jiffies - backbone_gw->lasttime); |
|
|
|
if (is_own) |
|
if (nla_put_flag(msg, BATADV_ATTR_BLA_OWN)) { |
|
genlmsg_cancel(msg, hdr); |
|
goto out; |
|
} |
|
|
|
if (nla_put(msg, BATADV_ATTR_BLA_BACKBONE, ETH_ALEN, |
|
backbone_gw->orig) || |
|
nla_put_u16(msg, BATADV_ATTR_BLA_VID, backbone_gw->vid) || |
|
nla_put_u16(msg, BATADV_ATTR_BLA_CRC, |
|
backbone_crc) || |
|
nla_put_u32(msg, BATADV_ATTR_LAST_SEEN_MSECS, msecs)) { |
|
genlmsg_cancel(msg, hdr); |
|
goto out; |
|
} |
|
|
|
genlmsg_end(msg, hdr); |
|
ret = 0; |
|
|
|
out: |
|
return ret; |
|
} |
|
|
|
/** |
|
* batadv_bla_backbone_dump_bucket() - dump one bucket of the backbone table to |
|
* a netlink socket |
|
* @msg: buffer for the message |
|
* @portid: netlink port |
|
* @cb: Control block containing additional options |
|
* @primary_if: primary interface |
|
* @hash: hash to dump |
|
* @bucket: bucket index to dump |
|
* @idx_skip: How many entries to skip |
|
* |
|
* Return: always 0. |
|
*/ |
|
static int |
|
batadv_bla_backbone_dump_bucket(struct sk_buff *msg, u32 portid, |
|
struct netlink_callback *cb, |
|
struct batadv_hard_iface *primary_if, |
|
struct batadv_hashtable *hash, |
|
unsigned int bucket, int *idx_skip) |
|
{ |
|
struct batadv_bla_backbone_gw *backbone_gw; |
|
int idx = 0; |
|
int ret = 0; |
|
|
|
spin_lock_bh(&hash->list_locks[bucket]); |
|
cb->seq = atomic_read(&hash->generation) << 1 | 1; |
|
|
|
hlist_for_each_entry(backbone_gw, &hash->table[bucket], hash_entry) { |
|
if (idx++ < *idx_skip) |
|
continue; |
|
|
|
ret = batadv_bla_backbone_dump_entry(msg, portid, cb, |
|
primary_if, backbone_gw); |
|
if (ret) { |
|
*idx_skip = idx - 1; |
|
goto unlock; |
|
} |
|
} |
|
|
|
*idx_skip = 0; |
|
unlock: |
|
spin_unlock_bh(&hash->list_locks[bucket]); |
|
return ret; |
|
} |
|
|
|
/** |
|
* batadv_bla_backbone_dump() - dump backbone table to a netlink socket |
|
* @msg: buffer for the message |
|
* @cb: callback structure containing arguments |
|
* |
|
* Return: message length. |
|
*/ |
|
int batadv_bla_backbone_dump(struct sk_buff *msg, struct netlink_callback *cb) |
|
{ |
|
struct batadv_hard_iface *primary_if = NULL; |
|
int portid = NETLINK_CB(cb->skb).portid; |
|
struct net *net = sock_net(cb->skb->sk); |
|
struct net_device *soft_iface; |
|
struct batadv_hashtable *hash; |
|
struct batadv_priv *bat_priv; |
|
int bucket = cb->args[0]; |
|
int idx = cb->args[1]; |
|
int ifindex; |
|
int ret = 0; |
|
|
|
ifindex = batadv_netlink_get_ifindex(cb->nlh, |
|
BATADV_ATTR_MESH_IFINDEX); |
|
if (!ifindex) |
|
return -EINVAL; |
|
|
|
soft_iface = dev_get_by_index(net, ifindex); |
|
if (!soft_iface || !batadv_softif_is_valid(soft_iface)) { |
|
ret = -ENODEV; |
|
goto out; |
|
} |
|
|
|
bat_priv = netdev_priv(soft_iface); |
|
hash = bat_priv->bla.backbone_hash; |
|
|
|
primary_if = batadv_primary_if_get_selected(bat_priv); |
|
if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) { |
|
ret = -ENOENT; |
|
goto out; |
|
} |
|
|
|
while (bucket < hash->size) { |
|
if (batadv_bla_backbone_dump_bucket(msg, portid, cb, primary_if, |
|
hash, bucket, &idx)) |
|
break; |
|
bucket++; |
|
} |
|
|
|
cb->args[0] = bucket; |
|
cb->args[1] = idx; |
|
|
|
ret = msg->len; |
|
|
|
out: |
|
if (primary_if) |
|
batadv_hardif_put(primary_if); |
|
|
|
if (soft_iface) |
|
dev_put(soft_iface); |
|
|
|
return ret; |
|
} |
|
|
|
#ifdef CONFIG_BATMAN_ADV_DAT |
|
/** |
|
* batadv_bla_check_claim() - check if address is claimed |
|
* |
|
* @bat_priv: the bat priv with all the soft interface information |
|
* @addr: mac address of which the claim status is checked |
|
* @vid: the VLAN ID |
|
* |
|
* addr is checked if this address is claimed by the local device itself. |
|
* |
|
* Return: true if bla is disabled or the mac is claimed by the device, |
|
* false if the device addr is already claimed by another gateway |
|
*/ |
|
bool batadv_bla_check_claim(struct batadv_priv *bat_priv, |
|
u8 *addr, unsigned short vid) |
|
{ |
|
struct batadv_bla_claim search_claim; |
|
struct batadv_bla_claim *claim = NULL; |
|
struct batadv_hard_iface *primary_if = NULL; |
|
bool ret = true; |
|
|
|
if (!atomic_read(&bat_priv->bridge_loop_avoidance)) |
|
return ret; |
|
|
|
primary_if = batadv_primary_if_get_selected(bat_priv); |
|
if (!primary_if) |
|
return ret; |
|
|
|
/* First look if the mac address is claimed */ |
|
ether_addr_copy(search_claim.addr, addr); |
|
search_claim.vid = vid; |
|
|
|
claim = batadv_claim_hash_find(bat_priv, &search_claim); |
|
|
|
/* If there is a claim and we are not owner of the claim, |
|
* return false. |
|
*/ |
|
if (claim) { |
|
if (!batadv_compare_eth(claim->backbone_gw->orig, |
|
primary_if->net_dev->dev_addr)) |
|
ret = false; |
|
batadv_claim_put(claim); |
|
} |
|
|
|
batadv_hardif_put(primary_if); |
|
return ret; |
|
} |
|
#endif
|
|
|