| // SPDX-License-Identifier: GPL-2.0 |
| /* Copyright (C) 2011-2020 B.A.T.M.A.N. contributors: |
| * |
| * Simon Wunderlich |
| */ |
| |
| #include "bridge_loop_avoidance.h" |
| #include "main.h" |
| |
| #include <linux/atomic.h> |
| #include <linux/byteorder/generic.h> |
| #include <linux/compiler.h> |
| #include <linux/crc16.h> |
| #include <linux/errno.h> |
| #include <linux/etherdevice.h> |
| #include <linux/gfp.h> |
| #include <linux/if_arp.h> |
| #include <linux/if_ether.h> |
| #include <linux/if_vlan.h> |
| #include <linux/jhash.h> |
| #include <linux/jiffies.h> |
| #include <linux/kernel.h> |
| #include <linux/kref.h> |
| #include <linux/list.h> |
| #include <linux/lockdep.h> |
| #include <linux/netdevice.h> |
| #include <linux/netlink.h> |
| #include <linux/rculist.h> |
| #include <linux/rcupdate.h> |
| #include <linux/seq_file.h> |
| #include <linux/skbuff.h> |
| #include <linux/slab.h> |
| #include <linux/spinlock.h> |
| #include <linux/stddef.h> |
| #include <linux/string.h> |
| #include <linux/workqueue.h> |
| #include <net/arp.h> |
| #include <net/genetlink.h> |
| #include <net/netlink.h> |
| #include <net/sock.h> |
| #include <uapi/linux/batadv_packet.h> |
| #include <uapi/linux/batman_adv.h> |
| |
| #include "hard-interface.h" |
| #include "hash.h" |
| #include "log.h" |
| #include "netlink.h" |
| #include "originator.h" |
| #include "soft-interface.h" |
| #include "translation-table.h" |
| |
| static const u8 batadv_announce_mac[4] = {0x43, 0x05, 0x43, 0x05}; |
| |
| static void batadv_bla_periodic_work(struct work_struct *work); |
| static void |
| batadv_bla_send_announce(struct batadv_priv *bat_priv, |
| struct batadv_bla_backbone_gw *backbone_gw); |
| |
| /** |
| * batadv_choose_claim() - choose the right bucket for a claim. |
| * @data: data to hash |
| * @size: size of the hash table |
| * |
| * Return: the hash index of the claim |
| */ |
| static inline u32 batadv_choose_claim(const void *data, u32 size) |
| { |
| struct batadv_bla_claim *claim = (struct batadv_bla_claim *)data; |
| u32 hash = 0; |
| |
| hash = jhash(&claim->addr, sizeof(claim->addr), hash); |
| hash = jhash(&claim->vid, sizeof(claim->vid), hash); |
| |
| return hash % size; |
| } |
| |
| /** |
| * batadv_choose_backbone_gw() - choose the right bucket for a backbone gateway. |
| * @data: data to hash |
| * @size: size of the hash table |
| * |
| * Return: the hash index of the backbone gateway |
| */ |
| static inline u32 batadv_choose_backbone_gw(const void *data, u32 size) |
| { |
| const struct batadv_bla_claim *claim = (struct batadv_bla_claim *)data; |
| u32 hash = 0; |
| |
| hash = jhash(&claim->addr, sizeof(claim->addr), hash); |
| hash = jhash(&claim->vid, sizeof(claim->vid), hash); |
| |
| return hash % size; |
| } |
| |
| /** |
| * batadv_compare_backbone_gw() - compare address and vid of two backbone gws |
| * @node: list node of the first entry to compare |
| * @data2: pointer to the second backbone gateway |
| * |
| * Return: true if the backbones have the same data, false otherwise |
| */ |
| static bool batadv_compare_backbone_gw(const struct hlist_node *node, |
| const void *data2) |
| { |
| const void *data1 = container_of(node, struct batadv_bla_backbone_gw, |
| hash_entry); |
| const struct batadv_bla_backbone_gw *gw1 = data1; |
| const struct batadv_bla_backbone_gw *gw2 = data2; |
| |
| if (!batadv_compare_eth(gw1->orig, gw2->orig)) |
| return false; |
| |
| if (gw1->vid != gw2->vid) |
| return false; |
| |
| return true; |
| } |
| |
| /** |
| * batadv_compare_claim() - compare address and vid of two claims |
| * @node: list node of the first entry to compare |
| * @data2: pointer to the second claims |
| * |
| * Return: true if the claim have the same data, 0 otherwise |
| */ |
| static bool batadv_compare_claim(const struct hlist_node *node, |
| const void *data2) |
| { |
| const void *data1 = container_of(node, struct batadv_bla_claim, |
| hash_entry); |
| const struct batadv_bla_claim *cl1 = data1; |
| const struct batadv_bla_claim *cl2 = data2; |
| |
| if (!batadv_compare_eth(cl1->addr, cl2->addr)) |
| return false; |
| |
| if (cl1->vid != cl2->vid) |
| return false; |
| |
| return true; |
| } |
| |
| /** |
| * batadv_backbone_gw_release() - release backbone gw from lists and queue for |
| * free after rcu grace period |
| * @ref: kref pointer of the backbone gw |
| */ |
| static void batadv_backbone_gw_release(struct kref *ref) |
| { |
| struct batadv_bla_backbone_gw *backbone_gw; |
| |
| backbone_gw = container_of(ref, struct batadv_bla_backbone_gw, |
| refcount); |
| |
| kfree_rcu(backbone_gw, rcu); |
| } |
| |
| /** |
| * batadv_backbone_gw_put() - decrement the backbone gw refcounter and possibly |
| * release it |
| * @backbone_gw: backbone gateway to be free'd |
| */ |
| static void batadv_backbone_gw_put(struct batadv_bla_backbone_gw *backbone_gw) |
| { |
| kref_put(&backbone_gw->refcount, batadv_backbone_gw_release); |
| } |
| |
| /** |
| * batadv_claim_release() - release claim from lists and queue for free after |
| * rcu grace period |
| * @ref: kref pointer of the claim |
| */ |
| static void batadv_claim_release(struct kref *ref) |
| { |
| struct batadv_bla_claim *claim; |
| struct batadv_bla_backbone_gw *old_backbone_gw; |
| |
| claim = container_of(ref, struct batadv_bla_claim, refcount); |
| |
| spin_lock_bh(&claim->backbone_lock); |
| old_backbone_gw = claim->backbone_gw; |
| claim->backbone_gw = NULL; |
| spin_unlock_bh(&claim->backbone_lock); |
| |
| 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); |
| |
| kfree_rcu(claim, rcu); |
| } |
| |
| /** |
| * batadv_claim_put() - decrement the claim refcounter and possibly release it |
| * @claim: claim to be free'd |
| */ |
| static void batadv_claim_put(struct batadv_bla_claim *claim) |
| { |
| kref_put(&claim->refcount, batadv_claim_release); |
| } |
| |
| /** |
| * batadv_claim_hash_find() - looks for a claim in the claim hash |
| * @bat_priv: the bat priv with all the soft interface information |
| * @data: search data (may be local/static data) |
| * |
| * Return: claim if found or NULL otherwise. |
| */ |
| static struct batadv_bla_claim * |
| batadv_claim_hash_find(struct batadv_priv *bat_priv, |
| struct batadv_bla_claim *data) |
| { |
| struct batadv_hashtable *hash = bat_priv->bla.claim_hash; |
| struct hlist_head *head; |
| struct batadv_bla_claim *claim; |
| struct batadv_bla_claim *claim_tmp = NULL; |
| int index; |
| |
| if (!hash) |
| return NULL; |
| |
| index = batadv_choose_claim(data, hash->size); |
| head = &hash->table[index]; |
| |
| rcu_read_lock(); |
| hlist_for_each_entry_rcu(claim, head, hash_entry) { |
| if (!batadv_compare_claim(&claim->hash_entry, data)) |
| continue; |
| |
| if (!kref_get_unless_zero(&claim->refcount)) |
| continue; |
| |
| claim_tmp = claim; |
| break; |
| } |
| rcu_read_unlock(); |
| |
| return claim_tmp; |
| } |
| |
| /** |
| * batadv_backbone_hash_find() - looks for a backbone gateway in the hash |
| * @bat_priv: the bat priv with all the soft interface information |
| * @addr: the address of the originator |
| * @vid: the VLAN ID |
| * |
| * Return: backbone gateway if found or NULL otherwise |
| */ |
| static struct batadv_bla_backbone_gw * |
| batadv_backbone_hash_find(struct batadv_priv *bat_priv, u8 *addr, |
| unsigned short vid) |
| { |
| struct batadv_hashtable *hash = bat_priv->bla.backbone_hash; |
| struct hlist_head *head; |
| struct batadv_bla_backbone_gw search_entry, *backbone_gw; |
| struct batadv_bla_backbone_gw *backbone_gw_tmp = NULL; |
| int index; |
| |
| if (!hash) |
| return NULL; |
| |
| ether_addr_copy(search_entry.orig, addr); |
| search_entry.vid = vid; |
| |
| index = batadv_choose_backbone_gw(&search_entry, hash->size); |
| head = &hash->table[index]; |
| |
| rcu_read_lock(); |
| hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
| if (!batadv_compare_backbone_gw(&backbone_gw->hash_entry, |
| &search_entry)) |
| continue; |
| |
| if (!kref_get_unless_zero(&backbone_gw->refcount)) |
| continue; |
| |
| backbone_gw_tmp = backbone_gw; |
| break; |
| } |
| rcu_read_unlock(); |
| |
| return backbone_gw_tmp; |
| } |
| |
| /** |
| * batadv_bla_del_backbone_claims() - delete all claims for a backbone |
| * @backbone_gw: backbone gateway where the claims should be removed |
| */ |
| static void |
| batadv_bla_del_backbone_claims(struct batadv_bla_backbone_gw *backbone_gw) |
| { |
| struct batadv_hashtable *hash; |
| struct hlist_node *node_tmp; |
| struct hlist_head *head; |
| struct batadv_bla_claim *claim; |
| int i; |
| spinlock_t *list_lock; /* protects write access to the hash lists */ |
| |
| hash = backbone_gw->bat_priv->bla.claim_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(claim, node_tmp, |
| head, hash_entry) { |
| if (claim->backbone_gw != backbone_gw) |
| continue; |
| |
| batadv_claim_put(claim); |
| hlist_del_rcu(&claim->hash_entry); |
| } |
| spin_unlock_bh(list_lock); |
| } |
| |
| /* all claims gone, initialize CRC */ |
| spin_lock_bh(&backbone_gw->crc_lock); |
| backbone_gw->crc = BATADV_BLA_CRC_INIT; |
| spin_unlock_bh(&backbone_gw->crc_lock); |
| } |
| |
| /** |
| * batadv_bla_send_claim() - sends a claim frame according to the provided info |
| * @bat_priv: the bat priv with all the soft interface information |
| * @mac: the mac address to be announced within the claim |
| * @vid: the VLAN ID |
| * @claimtype: the type of the claim (CLAIM, UNCLAIM, ANNOUNCE, ...) |
| */ |
| static void batadv_bla_send_claim(struct batadv_priv *bat_priv, u8 *mac, |
| unsigned short vid, int claimtype) |
| { |
| struct sk_buff *skb; |
| struct ethhdr *ethhdr; |
| struct batadv_hard_iface *primary_if; |
| struct net_device *soft_iface; |
| u8 *hw_src; |
| struct batadv_bla_claim_dst local_claim_dest; |
| __be32 zeroip = 0; |
| |
| primary_if = batadv_primary_if_get_selected(bat_priv); |
| if (!primary_if) |
| return; |
| |
| memcpy(&local_claim_dest, &bat_priv->bla.claim_dest, |
| sizeof(local_claim_dest)); |
| local_claim_dest.type = claimtype; |
| |
| soft_iface = primary_if->soft_iface; |
| |
| skb = arp_create(ARPOP_REPLY, ETH_P_ARP, |
| /* IP DST: 0.0.0.0 */ |
| zeroip, |
| primary_if->soft_iface, |
| /* IP SRC: 0.0.0.0 */ |
| zeroip, |
| /* Ethernet DST: Broadcast */ |
| NULL, |
| /* Ethernet SRC/HW SRC: originator mac */ |
| primary_if->net_dev->dev_addr, |
| /* HW DST: FF:43:05:XX:YY:YY |
| * with XX = claim type |
| * and YY:YY = group id |
| */ |
| (u8 *)&local_claim_dest); |
| |
| if (!skb) |
| goto out; |
| |
| ethhdr = (struct ethhdr *)skb->data; |
| hw_src = (u8 *)ethhdr + ETH_HLEN + sizeof(struct arphdr); |
| |
| /* now we pretend that the client would have sent this ... */ |
| switch (claimtype) { |
| case BATADV_CLAIM_TYPE_CLAIM: |
| /* normal claim frame |
| * set Ethernet SRC to the clients mac |
| */ |
| ether_addr_copy(ethhdr->h_source, mac); |
| batadv_dbg(BATADV_DBG_BLA, bat_priv, |
| "%s(): CLAIM %pM on vid %d\n", __func__, mac, |
| batadv_print_vid(vid)); |
| break; |
| case BATADV_CLAIM_TYPE_UNCLAIM: |
| /* unclaim frame |
| * set HW SRC to the clients mac |
| */ |
| ether_addr_copy(hw_src, mac); |
| batadv_dbg(BATADV_DBG_BLA, bat_priv, |
| "%s(): UNCLAIM %pM on vid %d\n", __func__, mac, |
| batadv_print_vid(vid)); |
| break; |
| case BATADV_CLAIM_TYPE_ANNOUNCE: |
| /* announcement frame |
| * set HW SRC to the special mac containg the crc |
| */ |
| ether_addr_copy(hw_src, mac); |
| batadv_dbg(BATADV_DBG_BLA, bat_priv, |
| "%s(): ANNOUNCE of %pM on vid %d\n", __func__, |
| ethhdr->h_source, batadv_print_vid(vid)); |
| break; |
| case BATADV_CLAIM_TYPE_REQUEST: |
| /* request frame |
| * set HW SRC and header destination to the receiving backbone |
| * gws mac |
| */ |
| ether_addr_copy(hw_src, mac); |
| ether_addr_copy(ethhdr->h_dest, mac); |
| batadv_dbg(BATADV_DBG_BLA, bat_priv, |
| "%s(): REQUEST of %pM to %pM on vid %d\n", __func__, |
| ethhdr->h_source, ethhdr->h_dest, |
| batadv_print_vid(vid)); |
| break; |
| case BATADV_CLAIM_TYPE_LOOPDETECT: |
| ether_addr_copy(ethhdr->h_source, mac); |
| batadv_dbg(BATADV_DBG_BLA, bat_priv, |
| "%s(): LOOPDETECT of %pM to %pM on vid %d\n", |
| __func__, ethhdr->h_source, ethhdr->h_dest, |
| batadv_print_vid(vid)); |
| |
| break; |
| } |
| |
| if (vid & BATADV_VLAN_HAS_TAG) { |
| skb = vlan_insert_tag(skb, htons(ETH_P_8021Q), |
| vid & VLAN_VID_MASK); |
| if (!skb) |
| goto out; |
| } |
| |
| skb_reset_mac_header(skb); |
| skb->protocol = eth_type_trans(skb, soft_iface); |
| batadv_inc_counter(bat_priv, BATADV_CNT_RX); |
| batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES, |
| skb->len + ETH_HLEN); |
| |
| netif_rx(skb); |
| out: |
| if (primary_if) |
| batadv_hardif_put(primary_if); |
| } |
| |
| /** |
| * batadv_bla_loopdetect_report() - worker for reporting the loop |
| * @work: work queue item |
| * |
| * Throws an uevent, as the loopdetect check function can't do that itself |
| * since the kernel may sleep while throwing uevents. |
| */ |
| static void batadv_bla_loopdetect_report(struct work_struct *work) |
| { |
| struct batadv_bla_backbone_gw *backbone_gw; |
| struct batadv_priv *bat_priv; |
| char vid_str[6] = { '\0' }; |
| |
| backbone_gw = container_of(work, struct batadv_bla_backbone_gw, |
| report_work); |
| bat_priv = backbone_gw->bat_priv; |
| |
| batadv_info(bat_priv->soft_iface, |
| "Possible loop on VLAN %d detected which can't be handled by BLA - please check your network setup!\n", |
| batadv_print_vid(backbone_gw->vid)); |
| snprintf(vid_str, sizeof(vid_str), "%d", |
| batadv_print_vid(backbone_gw->vid)); |
| vid_str[sizeof(vid_str) - 1] = 0; |
| |
| batadv_throw_uevent(bat_priv, BATADV_UEV_BLA, BATADV_UEV_LOOPDETECT, |
| vid_str); |
| |
| batadv_backbone_gw_put(backbone_gw); |
| } |
| |
| /** |
| * batadv_bla_get_backbone_gw() - finds or creates a backbone gateway |
| * @bat_priv: the bat priv with all the soft interface information |
| * @orig: the mac address of the originator |
| * @vid: the VLAN ID |
| * @own_backbone: set if the requested backbone is local |
| * |
| * Return: the (possibly created) backbone gateway or NULL on error |
| */ |
| static struct batadv_bla_backbone_gw * |
| batadv_bla_get_backbone_gw(struct batadv_priv *bat_priv, u8 *orig, |
| unsigned short vid, bool own_backbone) |
| { |
| struct batadv_bla_backbone_gw *entry; |
| struct batadv_orig_node *orig_node; |
| int hash_added; |
| |
| entry = batadv_backbone_hash_find(bat_priv, orig, vid); |
| |
| if (entry) |
| return entry; |
| |
| batadv_dbg(BATADV_DBG_BLA, bat_priv, |
| "%s(): not found (%pM, %d), creating new entry\n", __func__, |
| orig, batadv_print_vid(vid)); |
| |
| entry = kzalloc(sizeof(*entry), GFP_ATOMIC); |
| if (!entry) |
| return NULL; |
| |
| entry->vid = vid; |
| entry->lasttime = jiffies; |
| entry->crc = BATADV_BLA_CRC_INIT; |
| entry->bat_priv = bat_priv; |
| spin_lock_init(&entry->crc_lock); |
| atomic_set(&entry->request_sent, 0); |
| atomic_set(&entry->wait_periods, 0); |
| ether_addr_copy(entry->orig, orig); |
| INIT_WORK(&entry->report_work, batadv_bla_loopdetect_report); |
| kref_init(&entry->refcount); |
| |
| kref_get(&entry->refcount); |
| hash_added = batadv_hash_add(bat_priv->bla.backbone_hash, |
| batadv_compare_backbone_gw, |
| batadv_choose_backbone_gw, entry, |
| &entry->hash_entry); |
| |
| if (unlikely(hash_added != 0)) { |
| /* hash failed, free the structure */ |
| kfree(entry); |
| return NULL; |
| } |
| |
| /* this is a gateway now, remove any TT entry on this VLAN */ |
| orig_node = batadv_orig_hash_find(bat_priv, orig); |
| if (orig_node) { |
| batadv_tt_global_del_orig(bat_priv, orig_node, vid, |
| "became a backbone gateway"); |
| batadv_orig_node_put(orig_node); |
| } |
| |
| if (own_backbone) { |
| batadv_bla_send_announce(bat_priv, entry); |
| |
| /* this will be decreased in the worker thread */ |
| atomic_inc(&entry->request_sent); |
| 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 its 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_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. |
| * |
| * 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. |
| */ |
| bool batadv_bla_check_bcast_duplist(struct batadv_priv *bat_priv, |
| struct sk_buff *skb) |
| { |
| int i, curr; |
| __be32 crc; |
| struct batadv_bcast_packet *bcast_packet; |
| struct batadv_bcast_duplist_entry *entry; |
| bool ret = false; |
| |
| bcast_packet = (struct batadv_bcast_packet *)skb->data; |
| |
| /* calculate the crc ... */ |
| crc = batadv_skb_crc32(skb, (u8 *)(bcast_packet + 1)); |
| |
| 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; |
| |
| if (batadv_compare_eth(entry->orig, bcast_packet->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; |
| ether_addr_copy(entry->orig, bcast_packet->orig); |
| bat_priv->bla.bcast_duplist_curr = curr; |
| |
| out: |
| spin_unlock_bh(&bat_priv->bla.bcast_duplist_lock); |
| |
| return ret; |
| } |
| |
| /** |
| * 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, |
| * throw an uevent and log the event if that is the case. |
| * |
| * Return: true if it is a loop detect frame which is to be dropped, false |
| * otherwise. |
| */ |
| static bool |
| batadv_bla_loopdetect_check(struct batadv_priv *bat_priv, struct sk_buff *skb, |
| struct batadv_hard_iface *primary_if, |
| unsigned short vid) |
| { |
| struct batadv_bla_backbone_gw *backbone_gw; |
| struct ethhdr *ethhdr; |
| 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 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 |
| * @is_bcast: the packet came in a broadcast packet type. |
| * |
| * 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, bool is_bcast) |
| { |
| 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 broadcasts while requests are in flight */ |
| if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast) |
| 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 broadcast ... */ |
| if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast) { |
| /* ... drop it. the responsible gateway is in charge. |
| * |
| * We need to check is_bcast because with the gateway |
| * feature, broadcasts (like DHCP requests) may be sent |
| * using a unicast packet type. |
| */ |
| 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; |
| } |
| |
| #ifdef CONFIG_BATMAN_ADV_DEBUGFS |
| /** |
| * batadv_bla_claim_table_seq_print_text() - print the claim table in a seq file |
| * @seq: seq file to print on |
| * @offset: not used |
| * |
| * Return: always 0 |
| */ |
| int batadv_bla_claim_table_seq_print_text(struct seq_file *seq, void *offset) |
| { |
| struct net_device *net_dev = (struct net_device *)seq->private; |
| struct batadv_priv *bat_priv = netdev_priv(net_dev); |
| struct batadv_hashtable *hash = bat_priv->bla.claim_hash; |
| struct batadv_bla_backbone_gw *backbone_gw; |
| struct batadv_bla_claim *claim; |
| struct batadv_hard_iface *primary_if; |
| struct hlist_head *head; |
| u16 backbone_crc; |
| u32 i; |
| bool is_own; |
| u8 *primary_addr; |
| |
| primary_if = batadv_seq_print_text_primary_if_get(seq); |
| if (!primary_if) |
| goto out; |
| |
| primary_addr = primary_if->net_dev->dev_addr; |
| seq_printf(seq, |
| "Claims announced for the mesh %s (orig %pM, group id %#.4x)\n", |
| net_dev->name, primary_addr, |
| ntohs(bat_priv->bla.claim_dest.group)); |
| seq_puts(seq, |
| " Client VID Originator [o] (CRC )\n"); |
| 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); |
| |
| 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); |
| seq_printf(seq, " * %pM on %5d by %pM [%c] (%#.4x)\n", |
| claim->addr, batadv_print_vid(claim->vid), |
| backbone_gw->orig, |
| (is_own ? 'x' : ' '), |
| backbone_crc); |
| |
| batadv_backbone_gw_put(backbone_gw); |
| } |
| rcu_read_unlock(); |
| } |
| out: |
| if (primary_if) |
| batadv_hardif_put(primary_if); |
| return 0; |
| } |
| #endif |
| |
| /** |
| * 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; |
| } |
| |
| #ifdef CONFIG_BATMAN_ADV_DEBUGFS |
| /** |
| * batadv_bla_backbone_table_seq_print_text() - print the backbone table in a |
| * seq file |
| * @seq: seq file to print on |
| * @offset: not used |
| * |
| * Return: always 0 |
| */ |
| int batadv_bla_backbone_table_seq_print_text(struct seq_file *seq, void *offset) |
| { |
| struct net_device *net_dev = (struct net_device *)seq->private; |
| struct batadv_priv *bat_priv = netdev_priv(net_dev); |
| struct batadv_hashtable *hash = bat_priv->bla.backbone_hash; |
| struct batadv_bla_backbone_gw *backbone_gw; |
| struct batadv_hard_iface *primary_if; |
| struct hlist_head *head; |
| int secs, msecs; |
| u16 backbone_crc; |
| u32 i; |
| bool is_own; |
| u8 *primary_addr; |
| |
| primary_if = batadv_seq_print_text_primary_if_get(seq); |
| if (!primary_if) |
| goto out; |
| |
| primary_addr = primary_if->net_dev->dev_addr; |
| seq_printf(seq, |
| "Backbones announced for the mesh %s (orig %pM, group id %#.4x)\n", |
| net_dev->name, primary_addr, |
| ntohs(bat_priv->bla.claim_dest.group)); |
| seq_puts(seq, " Originator VID last seen (CRC )\n"); |
| for (i = 0; i < hash->size; i++) { |
| head = &hash->table[i]; |
| |
| rcu_read_lock(); |
| hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
| msecs = jiffies_to_msecs(jiffies - |
| backbone_gw->lasttime); |
| secs = msecs / 1000; |
| msecs = msecs % 1000; |
| |
| is_own = batadv_compare_eth(backbone_gw->orig, |
| primary_addr); |
| if (is_own) |
| continue; |
| |
| spin_lock_bh(&backbone_gw->crc_lock); |
| backbone_crc = backbone_gw->crc; |
| spin_unlock_bh(&backbone_gw->crc_lock); |
| |
| seq_printf(seq, " * %pM on %5d %4i.%03is (%#.4x)\n", |
| backbone_gw->orig, |
| batadv_print_vid(backbone_gw->vid), secs, |
| msecs, backbone_crc); |
| } |
| rcu_read_unlock(); |
| } |
| out: |
| if (primary_if) |
| batadv_hardif_put(primary_if); |
| return 0; |
| } |
| #endif |
| |
| /** |
| * 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 |