X-Git-Url: http://git.cascardo.info/?a=blobdiff_plain;f=net%2Fbatman-adv%2Ftranslation-table.c;h=4add57d4857f11e5ea9edfa13aae1f46dab3e4f9;hb=869526b958f59592c46086c11f638824b08d164a;hp=58794c4cea91dbfbf3bface9ad6f62a5c9697907;hpb=b8cbd81d0944cd2dc097b2b4ae8adaf639c5b4df;p=cascardo%2Flinux.git diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c index 58794c4cea91..4add57d4857f 100644 --- a/net/batman-adv/translation-table.c +++ b/net/batman-adv/translation-table.c @@ -208,13 +208,107 @@ static void batadv_tt_orig_list_entry_free_rcu(struct rcu_head *rcu) kfree(orig_entry); } +/** + * batadv_tt_local_size_mod - change the size by v of the local table identified + * by vid + * @bat_priv: the bat priv with all the soft interface information + * @vid: the VLAN identifier of the sub-table to change + * @v: the amount to sum to the local table size + */ +static void batadv_tt_local_size_mod(struct batadv_priv *bat_priv, + unsigned short vid, int v) +{ + struct batadv_softif_vlan *vlan; + + vlan = batadv_softif_vlan_get(bat_priv, vid); + if (!vlan) + return; + + atomic_add(v, &vlan->tt.num_entries); + + batadv_softif_vlan_free_ref(vlan); +} + +/** + * batadv_tt_local_size_inc - increase by one the local table size for the given + * vid + * @bat_priv: the bat priv with all the soft interface information + * @vid: the VLAN identifier + */ +static void batadv_tt_local_size_inc(struct batadv_priv *bat_priv, + unsigned short vid) +{ + batadv_tt_local_size_mod(bat_priv, vid, 1); +} + +/** + * batadv_tt_local_size_dec - decrease by one the local table size for the given + * vid + * @bat_priv: the bat priv with all the soft interface information + * @vid: the VLAN identifier + */ +static void batadv_tt_local_size_dec(struct batadv_priv *bat_priv, + unsigned short vid) +{ + batadv_tt_local_size_mod(bat_priv, vid, -1); +} + +/** + * batadv_tt_global_size_mod - change the size by v of the local table + * identified by vid + * @bat_priv: the bat priv with all the soft interface information + * @vid: the VLAN identifier + * @v: the amount to sum to the global table size + */ +static void batadv_tt_global_size_mod(struct batadv_orig_node *orig_node, + unsigned short vid, int v) +{ + struct batadv_orig_node_vlan *vlan; + + vlan = batadv_orig_node_vlan_new(orig_node, vid); + if (!vlan) + return; + + if (atomic_add_return(v, &vlan->tt.num_entries) == 0) { + spin_lock_bh(&orig_node->vlan_list_lock); + list_del_rcu(&vlan->list); + spin_unlock_bh(&orig_node->vlan_list_lock); + batadv_orig_node_vlan_free_ref(vlan); + } + + batadv_orig_node_vlan_free_ref(vlan); +} + +/** + * batadv_tt_global_size_inc - increase by one the global table size for the + * given vid + * @orig_node: the originator which global table size has to be decreased + * @vid: the vlan identifier + */ +static void batadv_tt_global_size_inc(struct batadv_orig_node *orig_node, + unsigned short vid) +{ + batadv_tt_global_size_mod(orig_node, vid, 1); +} + +/** + * batadv_tt_global_size_dec - decrease by one the global table size for the + * given vid + * @orig_node: the originator which global table size has to be decreased + * @vid: the vlan identifier + */ +static void batadv_tt_global_size_dec(struct batadv_orig_node *orig_node, + unsigned short vid) +{ + batadv_tt_global_size_mod(orig_node, vid, -1); +} + static void batadv_tt_orig_list_entry_free_ref(struct batadv_tt_orig_list_entry *orig_entry) { if (!atomic_dec_and_test(&orig_entry->refcount)) return; - /* to avoid race conditions, immediately decrease the tt counter */ - atomic_dec(&orig_entry->orig_node->tt_size); + call_rcu(&orig_entry->rcu, batadv_tt_orig_list_entry_free_rcu); } @@ -264,6 +358,13 @@ static void batadv_tt_local_event(struct batadv_priv *bat_priv, goto del; if (del_op_requested && !del_op_entry) goto del; + + /* this is a second add in the same originator interval. It + * means that flags have been changed: update them! + */ + if (!del_op_requested && !del_op_entry) + entry->change.flags = flags; + continue; del: list_del(&entry->list); @@ -307,6 +408,35 @@ static uint16_t batadv_tt_entries(uint16_t tt_len) return tt_len / batadv_tt_len(1); } +/** + * batadv_tt_local_table_transmit_size - calculates the local translation table + * size when transmitted over the air + * @bat_priv: the bat priv with all the soft interface information + * + * Returns local translation table size in bytes. + */ +static int batadv_tt_local_table_transmit_size(struct batadv_priv *bat_priv) +{ + uint16_t num_vlan = 0, tt_local_entries = 0; + struct batadv_softif_vlan *vlan; + int hdr_size; + + rcu_read_lock(); + hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) { + num_vlan++; + tt_local_entries += atomic_read(&vlan->tt.num_entries); + } + rcu_read_unlock(); + + /* header size of tvlv encapsulated tt response payload */ + hdr_size = sizeof(struct batadv_unicast_tvlv_packet); + hdr_size += sizeof(struct batadv_tvlv_hdr); + hdr_size += sizeof(struct batadv_tvlv_tt_data); + hdr_size += num_vlan * sizeof(struct batadv_tvlv_tt_vlan_data); + + return hdr_size + batadv_tt_len(tt_local_entries); +} + static int batadv_tt_local_init(struct batadv_priv *bat_priv) { if (bat_priv->tt.local_hash) @@ -345,17 +475,24 @@ static void batadv_tt_global_free(struct batadv_priv *bat_priv, * @vid: VLAN identifier * @ifindex: index of the interface where the client is connected to (useful to * identify wireless clients) + * + * Returns true if the client was successfully added, false otherwise. */ -void batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr, +bool batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr, unsigned short vid, int ifindex) { struct batadv_priv *bat_priv = netdev_priv(soft_iface); struct batadv_tt_local_entry *tt_local; struct batadv_tt_global_entry *tt_global; + struct net_device *in_dev = NULL; struct hlist_head *head; struct batadv_tt_orig_list_entry *orig_entry; - int hash_added; - bool roamed_back = false; + int hash_added, table_size, packet_size_max; + bool ret = false, roamed_back = false; + uint8_t remote_flags; + + if (ifindex != BATADV_NULL_IFINDEX) + in_dev = dev_get_by_index(&init_net, ifindex); tt_local = batadv_tt_local_hash_find(bat_priv, addr, vid); tt_global = batadv_tt_global_hash_find(bat_priv, addr, vid); @@ -390,6 +527,17 @@ void batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr, goto check_roaming; } + /* Ignore the client if we cannot send it in a full table response. */ + table_size = batadv_tt_local_table_transmit_size(bat_priv); + table_size += batadv_tt_len(1); + packet_size_max = atomic_read(&bat_priv->packet_size_max); + if (table_size > packet_size_max) { + net_ratelimited_function(batadv_info, soft_iface, + "Local translation table size (%i) exceeds maximum packet size (%i); Ignoring new local tt entry: %pM\n", + table_size, packet_size_max, addr); + goto out; + } + tt_local = kmalloc(sizeof(*tt_local), GFP_ATOMIC); if (!tt_local) goto out; @@ -406,7 +554,7 @@ void batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr, */ tt_local->common.flags = BATADV_TT_CLIENT_NEW; tt_local->common.vid = vid; - if (batadv_is_wifi_iface(ifindex)) + if (batadv_is_wifi_netdev(in_dev)) tt_local->common.flags |= BATADV_TT_CLIENT_WIFI; atomic_set(&tt_local->common.refcount, 2); tt_local->last_seen = jiffies; @@ -456,11 +604,174 @@ check_roaming: } } + /* store the current remote flags before altering them. This helps + * understanding is flags are changing or not + */ + remote_flags = tt_local->common.flags & BATADV_TT_REMOTE_MASK; + + if (batadv_is_wifi_netdev(in_dev)) + tt_local->common.flags |= BATADV_TT_CLIENT_WIFI; + else + tt_local->common.flags &= ~BATADV_TT_CLIENT_WIFI; + + /* if any "dynamic" flag has been modified, resend an ADD event for this + * entry so that all the nodes can get the new flags + */ + if (remote_flags ^ (tt_local->common.flags & BATADV_TT_REMOTE_MASK)) + batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS); + + ret = true; out: + if (in_dev) + dev_put(in_dev); if (tt_local) batadv_tt_local_entry_free_ref(tt_local); if (tt_global) batadv_tt_global_entry_free_ref(tt_global); + return ret; +} + +/** + * batadv_tt_prepare_tvlv_global_data - prepare the TVLV TT header to send + * within a TT Response directed to another node + * @orig_node: originator for which the TT data has to be prepared + * @tt_data: uninitialised pointer to the address of the TVLV buffer + * @tt_change: uninitialised pointer to the address of the area where the TT + * changed can be stored + * @tt_len: pointer to the length to reserve to the tt_change. if -1 this + * function reserves the amount of space needed to send the entire global TT + * table. In case of success the value is updated with the real amount of + * reserved bytes + + * Allocate the needed amount of memory for the entire TT TVLV and write its + * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data + * objects, one per active VLAN served by the originator node. + * + * Return the size of the allocated buffer or 0 in case of failure. + */ +static uint16_t +batadv_tt_prepare_tvlv_global_data(struct batadv_orig_node *orig_node, + struct batadv_tvlv_tt_data **tt_data, + struct batadv_tvlv_tt_change **tt_change, + int32_t *tt_len) +{ + uint16_t num_vlan = 0, num_entries = 0, change_offset, tvlv_len; + struct batadv_tvlv_tt_vlan_data *tt_vlan; + struct batadv_orig_node_vlan *vlan; + uint8_t *tt_change_ptr; + + rcu_read_lock(); + list_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) { + num_vlan++; + num_entries += atomic_read(&vlan->tt.num_entries); + } + + change_offset = sizeof(**tt_data); + change_offset += num_vlan * sizeof(*tt_vlan); + + /* if tt_len is negative, allocate the space needed by the full table */ + if (*tt_len < 0) + *tt_len = batadv_tt_len(num_entries); + + tvlv_len = *tt_len; + tvlv_len += change_offset; + + *tt_data = kmalloc(tvlv_len, GFP_ATOMIC); + if (!*tt_data) { + *tt_len = 0; + goto out; + } + + (*tt_data)->flags = BATADV_NO_FLAGS; + (*tt_data)->ttvn = atomic_read(&orig_node->last_ttvn); + (*tt_data)->num_vlan = htons(num_vlan); + + tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1); + list_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) { + tt_vlan->vid = htons(vlan->vid); + tt_vlan->crc = htonl(vlan->tt.crc); + + tt_vlan++; + } + + tt_change_ptr = (uint8_t *)*tt_data + change_offset; + *tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr; + +out: + rcu_read_unlock(); + return tvlv_len; +} + +/** + * batadv_tt_prepare_tvlv_local_data - allocate and prepare the TT TVLV for this + * node + * @bat_priv: the bat priv with all the soft interface information + * @tt_data: uninitialised pointer to the address of the TVLV buffer + * @tt_change: uninitialised pointer to the address of the area where the TT + * changes can be stored + * @tt_len: pointer to the length to reserve to the tt_change. if -1 this + * function reserves the amount of space needed to send the entire local TT + * table. In case of success the value is updated with the real amount of + * reserved bytes + * + * Allocate the needed amount of memory for the entire TT TVLV and write its + * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data + * objects, one per active VLAN. + * + * Return the size of the allocated buffer or 0 in case of failure. + */ +static uint16_t +batadv_tt_prepare_tvlv_local_data(struct batadv_priv *bat_priv, + struct batadv_tvlv_tt_data **tt_data, + struct batadv_tvlv_tt_change **tt_change, + int32_t *tt_len) +{ + struct batadv_tvlv_tt_vlan_data *tt_vlan; + struct batadv_softif_vlan *vlan; + uint16_t num_vlan = 0, num_entries = 0, tvlv_len; + uint8_t *tt_change_ptr; + int change_offset; + + rcu_read_lock(); + hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) { + num_vlan++; + num_entries += atomic_read(&vlan->tt.num_entries); + } + + change_offset = sizeof(**tt_data); + change_offset += num_vlan * sizeof(*tt_vlan); + + /* if tt_len is negative, allocate the space needed by the full table */ + if (*tt_len < 0) + *tt_len = batadv_tt_len(num_entries); + + tvlv_len = *tt_len; + tvlv_len += change_offset; + + *tt_data = kmalloc(tvlv_len, GFP_ATOMIC); + if (!*tt_data) { + tvlv_len = 0; + goto out; + } + + (*tt_data)->flags = BATADV_NO_FLAGS; + (*tt_data)->ttvn = atomic_read(&bat_priv->tt.vn); + (*tt_data)->num_vlan = htons(num_vlan); + + tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1); + hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) { + tt_vlan->vid = htons(vlan->vid); + tt_vlan->crc = htonl(vlan->tt.crc); + + tt_vlan++; + } + + tt_change_ptr = (uint8_t *)*tt_data + change_offset; + *tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr; + +out: + rcu_read_unlock(); + return tvlv_len; } /** @@ -473,10 +784,12 @@ static void batadv_tt_tvlv_container_update(struct batadv_priv *bat_priv) struct batadv_tt_change_node *entry, *safe; struct batadv_tvlv_tt_data *tt_data; struct batadv_tvlv_tt_change *tt_change; - int tt_diff_len = 0, tt_change_len = 0; + int tt_diff_len, tt_change_len = 0; int tt_diff_entries_num = 0, tt_diff_entries_count = 0; + uint16_t tvlv_len; - tt_diff_len += batadv_tt_len(atomic_read(&bat_priv->tt.local_changes)); + tt_diff_entries_num = atomic_read(&bat_priv->tt.local_changes); + tt_diff_len = batadv_tt_len(tt_diff_entries_num); /* if we have too many changes for one packet don't send any * and wait for the tt table request which will be fragmented @@ -484,24 +797,19 @@ static void batadv_tt_tvlv_container_update(struct batadv_priv *bat_priv) if (tt_diff_len > bat_priv->soft_iface->mtu) tt_diff_len = 0; - tt_data = kzalloc(sizeof(*tt_data) + tt_diff_len, GFP_ATOMIC); - if (!tt_data) + tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv, &tt_data, + &tt_change, &tt_diff_len); + if (!tvlv_len) return; tt_data->flags = BATADV_TT_OGM_DIFF; - tt_data->ttvn = atomic_read(&bat_priv->tt.vn); - tt_data->crc = htonl(bat_priv->tt.local_crc); if (tt_diff_len == 0) goto container_register; - tt_diff_entries_num = batadv_tt_entries(tt_diff_len); - spin_lock_bh(&bat_priv->tt.changes_list_lock); atomic_set(&bat_priv->tt.local_changes, 0); - tt_change = (struct batadv_tvlv_tt_change *)(tt_data + 1); - list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list, list) { if (tt_diff_entries_count < tt_diff_entries_num) { @@ -537,7 +845,7 @@ static void batadv_tt_tvlv_container_update(struct batadv_priv *bat_priv) container_register: batadv_tvlv_container_register(bat_priv, BATADV_TVLV_TT, 1, tt_data, - sizeof(*tt_data) + tt_change_len); + tvlv_len); kfree(tt_data); } @@ -549,7 +857,9 @@ int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset) struct batadv_tt_common_entry *tt_common_entry; struct batadv_tt_local_entry *tt_local; struct batadv_hard_iface *primary_if; + struct batadv_softif_vlan *vlan; struct hlist_head *head; + unsigned short vid; uint32_t i; int last_seen_secs; int last_seen_msecs; @@ -562,11 +872,10 @@ int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset) goto out; seq_printf(seq, - "Locally retrieved addresses (from %s) announced via TT (TTVN: %u CRC: %#.8x):\n", - net_dev->name, (uint8_t)atomic_read(&bat_priv->tt.vn), - bat_priv->tt.local_crc); - seq_printf(seq, " %-13s %s %-7s %-10s\n", "Client", "VID", - "Flags", "Last seen"); + "Locally retrieved addresses (from %s) announced via TT (TTVN: %u):\n", + net_dev->name, (uint8_t)atomic_read(&bat_priv->tt.vn)); + seq_printf(seq, " %-13s %s %-7s %-9s (%-10s)\n", "Client", "VID", + "Flags", "Last seen", "CRC"); for (i = 0; i < hash->size; i++) { head = &hash->table[i]; @@ -577,6 +886,7 @@ int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset) tt_local = container_of(tt_common_entry, struct batadv_tt_local_entry, common); + vid = tt_common_entry->vid; last_seen_jiffies = jiffies - tt_local->last_seen; last_seen_msecs = jiffies_to_msecs(last_seen_jiffies); last_seen_secs = last_seen_msecs / 1000; @@ -584,7 +894,15 @@ int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset) no_purge = tt_common_entry->flags & np_flag; - seq_printf(seq, " * %pM %4i [%c%c%c%c%c] %3u.%03u\n", + vlan = batadv_softif_vlan_get(bat_priv, vid); + if (!vlan) { + seq_printf(seq, "Cannot retrieve VLAN %d\n", + BATADV_PRINT_VID(vid)); + continue; + } + + seq_printf(seq, + " * %pM %4i [%c%c%c%c%c] %3u.%03u (%#.8x)\n", tt_common_entry->addr, BATADV_PRINT_VID(tt_common_entry->vid), (tt_common_entry->flags & @@ -597,7 +915,10 @@ int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset) (tt_common_entry->flags & BATADV_TT_CLIENT_WIFI ? 'W' : '.'), no_purge ? 0 : last_seen_secs, - no_purge ? 0 : last_seen_msecs); + no_purge ? 0 : last_seen_msecs, + vlan->tt.crc); + + batadv_softif_vlan_free_ref(vlan); } rcu_read_unlock(); } @@ -679,8 +1000,16 @@ out: return curr_flags; } +/** + * batadv_tt_local_purge_list - purge inactive tt local entries + * @bat_priv: the bat priv with all the soft interface information + * @head: pointer to the list containing the local tt entries + * @timeout: parameter deciding whether a given tt local entry is considered + * inactive or not + */ static void batadv_tt_local_purge_list(struct batadv_priv *bat_priv, - struct hlist_head *head) + struct hlist_head *head, + int timeout) { struct batadv_tt_local_entry *tt_local_entry; struct batadv_tt_common_entry *tt_common_entry; @@ -698,8 +1027,7 @@ static void batadv_tt_local_purge_list(struct batadv_priv *bat_priv, if (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING) continue; - if (!batadv_has_timed_out(tt_local_entry->last_seen, - BATADV_TT_LOCAL_TIMEOUT)) + if (!batadv_has_timed_out(tt_local_entry->last_seen, timeout)) continue; batadv_tt_local_set_pending(bat_priv, tt_local_entry, @@ -707,7 +1035,14 @@ static void batadv_tt_local_purge_list(struct batadv_priv *bat_priv, } } -static void batadv_tt_local_purge(struct batadv_priv *bat_priv) +/** + * batadv_tt_local_purge - purge inactive tt local entries + * @bat_priv: the bat priv with all the soft interface information + * @timeout: parameter deciding whether a given tt local entry is considered + * inactive or not + */ +static void batadv_tt_local_purge(struct batadv_priv *bat_priv, + int timeout) { struct batadv_hashtable *hash = bat_priv->tt.local_hash; struct hlist_head *head; @@ -719,7 +1054,7 @@ static void batadv_tt_local_purge(struct batadv_priv *bat_priv) list_lock = &hash->list_locks[i]; spin_lock_bh(list_lock); - batadv_tt_local_purge_list(bat_priv, head); + batadv_tt_local_purge_list(bat_priv, head, timeout); spin_unlock_bh(list_lock); } } @@ -860,7 +1195,7 @@ batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry *tt_global, INIT_HLIST_NODE(&orig_entry->list); atomic_inc(&orig_node->refcount); - atomic_inc(&orig_node->tt_size); + batadv_tt_global_size_inc(orig_node, tt_global->common.vid); orig_entry->orig_node = orig_node; orig_entry->ttvn = ttvn; atomic_set(&orig_entry->refcount, 2); @@ -906,6 +1241,10 @@ static bool batadv_tt_global_add(struct batadv_priv *bat_priv, struct batadv_tt_common_entry *common; uint16_t local_flags; + /* ignore global entries from backbone nodes */ + if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig, vid)) + return true; + tt_global_entry = batadv_tt_global_hash_find(bat_priv, tt_addr, vid); tt_local_entry = batadv_tt_local_hash_find(bat_priv, tt_addr, vid); @@ -1029,18 +1368,20 @@ out: } /* batadv_transtable_best_orig - Get best originator list entry from tt entry + * @bat_priv: the bat priv with all the soft interface information * @tt_global_entry: global translation table entry to be analyzed * * This functon assumes the caller holds rcu_read_lock(). * Returns best originator list entry or NULL on errors. */ static struct batadv_tt_orig_list_entry * -batadv_transtable_best_orig(struct batadv_tt_global_entry *tt_global_entry) +batadv_transtable_best_orig(struct batadv_priv *bat_priv, + struct batadv_tt_global_entry *tt_global_entry) { - struct batadv_neigh_node *router = NULL; + struct batadv_neigh_node *router, *best_router = NULL; + struct batadv_algo_ops *bao = bat_priv->bat_algo_ops; struct hlist_head *head; struct batadv_tt_orig_list_entry *orig_entry, *best_entry = NULL; - int best_tq = 0; head = &tt_global_entry->orig_list; hlist_for_each_entry_rcu(orig_entry, head, list) { @@ -1048,67 +1389,104 @@ batadv_transtable_best_orig(struct batadv_tt_global_entry *tt_global_entry) if (!router) continue; - if (router->tq_avg > best_tq) { - best_entry = orig_entry; - best_tq = router->tq_avg; + if (best_router && + bao->bat_neigh_cmp(router, best_router) <= 0) { + batadv_neigh_node_free_ref(router); + continue; } - batadv_neigh_node_free_ref(router); + /* release the refcount for the "old" best */ + if (best_router) + batadv_neigh_node_free_ref(best_router); + + best_entry = orig_entry; + best_router = router; } + if (best_router) + batadv_neigh_node_free_ref(best_router); + return best_entry; } /* batadv_tt_global_print_entry - print all orig nodes who announce the address * for this global entry + * @bat_priv: the bat priv with all the soft interface information * @tt_global_entry: global translation table entry to be printed * @seq: debugfs table seq_file struct * * This functon assumes the caller holds rcu_read_lock(). */ static void -batadv_tt_global_print_entry(struct batadv_tt_global_entry *tt_global_entry, +batadv_tt_global_print_entry(struct batadv_priv *bat_priv, + struct batadv_tt_global_entry *tt_global_entry, struct seq_file *seq) { - struct hlist_head *head; struct batadv_tt_orig_list_entry *orig_entry, *best_entry; struct batadv_tt_common_entry *tt_common_entry; - uint16_t flags; + struct batadv_orig_node_vlan *vlan; + struct hlist_head *head; uint8_t last_ttvn; + uint16_t flags; tt_common_entry = &tt_global_entry->common; flags = tt_common_entry->flags; - best_entry = batadv_transtable_best_orig(tt_global_entry); + best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry); if (best_entry) { + vlan = batadv_orig_node_vlan_get(best_entry->orig_node, + tt_common_entry->vid); + if (!vlan) { + seq_printf(seq, + " * Cannot retrieve VLAN %d for originator %pM\n", + BATADV_PRINT_VID(tt_common_entry->vid), + best_entry->orig_node->orig); + goto print_list; + } + last_ttvn = atomic_read(&best_entry->orig_node->last_ttvn); seq_printf(seq, " %c %pM %4i (%3u) via %pM (%3u) (%#.8x) [%c%c%c]\n", '*', tt_global_entry->common.addr, BATADV_PRINT_VID(tt_global_entry->common.vid), best_entry->ttvn, best_entry->orig_node->orig, - last_ttvn, best_entry->orig_node->tt_crc, + last_ttvn, vlan->tt.crc, (flags & BATADV_TT_CLIENT_ROAM ? 'R' : '.'), (flags & BATADV_TT_CLIENT_WIFI ? 'W' : '.'), (flags & BATADV_TT_CLIENT_TEMP ? 'T' : '.')); + + batadv_orig_node_vlan_free_ref(vlan); } +print_list: head = &tt_global_entry->orig_list; hlist_for_each_entry_rcu(orig_entry, head, list) { if (best_entry == orig_entry) continue; + vlan = batadv_orig_node_vlan_get(orig_entry->orig_node, + tt_common_entry->vid); + if (!vlan) { + seq_printf(seq, + " + Cannot retrieve VLAN %d for originator %pM\n", + BATADV_PRINT_VID(tt_common_entry->vid), + orig_entry->orig_node->orig); + continue; + } + last_ttvn = atomic_read(&orig_entry->orig_node->last_ttvn); seq_printf(seq, - " %c %pM %4d (%3u) via %pM (%3u) [%c%c%c]\n", + " %c %pM %4d (%3u) via %pM (%3u) (%#.8x) [%c%c%c]\n", '+', tt_global_entry->common.addr, BATADV_PRINT_VID(tt_global_entry->common.vid), orig_entry->ttvn, orig_entry->orig_node->orig, - last_ttvn, + last_ttvn, vlan->tt.crc, (flags & BATADV_TT_CLIENT_ROAM ? 'R' : '.'), (flags & BATADV_TT_CLIENT_WIFI ? 'W' : '.'), (flags & BATADV_TT_CLIENT_TEMP ? 'T' : '.')); + + batadv_orig_node_vlan_free_ref(vlan); } } @@ -1143,7 +1521,7 @@ int batadv_tt_global_seq_print_text(struct seq_file *seq, void *offset) tt_global = container_of(tt_common_entry, struct batadv_tt_global_entry, common); - batadv_tt_global_print_entry(tt_global, seq); + batadv_tt_global_print_entry(bat_priv, tt_global, seq); } rcu_read_unlock(); } @@ -1165,6 +1543,8 @@ batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry) head = &tt_global_entry->orig_list; hlist_for_each_entry_safe(orig_entry, safe, head, list) { hlist_del_rcu(&orig_entry->list); + batadv_tt_global_size_dec(orig_entry->orig_node, + tt_global_entry->common.vid); batadv_tt_orig_list_entry_free_ref(orig_entry); } spin_unlock_bh(&tt_global_entry->list_lock); @@ -1192,6 +1572,8 @@ batadv_tt_global_del_orig_entry(struct batadv_priv *bat_priv, tt_global_entry->common.addr, BATADV_PRINT_VID(vid), message); hlist_del_rcu(&orig_entry->list); + batadv_tt_global_size_dec(orig_node, + tt_global_entry->common.vid); batadv_tt_orig_list_entry_free_ref(orig_entry); } } @@ -1304,8 +1686,18 @@ out: batadv_tt_local_entry_free_ref(local_entry); } +/** + * batadv_tt_global_del_orig - remove all the TT global entries belonging to the + * given originator matching the provided vid + * @bat_priv: the bat priv with all the soft interface information + * @orig_node: the originator owning the entries to remove + * @match_vid: the VLAN identifier to match. If negative all the entries will be + * removed + * @message: debug message to print as "reason" + */ void batadv_tt_global_del_orig(struct batadv_priv *bat_priv, struct batadv_orig_node *orig_node, + int32_t match_vid, const char *message) { struct batadv_tt_global_entry *tt_global; @@ -1327,6 +1719,10 @@ void batadv_tt_global_del_orig(struct batadv_priv *bat_priv, spin_lock_bh(list_lock); hlist_for_each_entry_safe(tt_common_entry, safe, head, hash_entry) { + /* remove only matching entries */ + if (match_vid >= 0 && tt_common_entry->vid != match_vid) + continue; + tt_global = container_of(tt_common_entry, struct batadv_tt_global_entry, common); @@ -1513,7 +1909,7 @@ struct batadv_orig_node *batadv_transtable_search(struct batadv_priv *bat_priv, goto out; rcu_read_lock(); - best_entry = batadv_transtable_best_orig(tt_global_entry); + best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry); /* found anything? */ if (best_entry) orig_node = best_entry->orig_node; @@ -1535,6 +1931,7 @@ out: * to the given orig_node * @bat_priv: the bat priv with all the soft interface information * @orig_node: originator for which the CRC should be computed + * @vid: VLAN identifier for which the CRC32 has to be computed * * This function computes the checksum for the global table corresponding to a * specific originator. In particular, the checksum is computed as follows: For @@ -1554,13 +1951,15 @@ out: * Returns the checksum of the global table of a given originator. */ static uint32_t batadv_tt_global_crc(struct batadv_priv *bat_priv, - struct batadv_orig_node *orig_node) + struct batadv_orig_node *orig_node, + unsigned short vid) { struct batadv_hashtable *hash = bat_priv->tt.global_hash; struct batadv_tt_common_entry *tt_common; struct batadv_tt_global_entry *tt_global; struct hlist_head *head; uint32_t i, crc_tmp, crc = 0; + uint8_t flags; for (i = 0; i < hash->size; i++) { head = &hash->table[i]; @@ -1570,6 +1969,12 @@ static uint32_t batadv_tt_global_crc(struct batadv_priv *bat_priv, tt_global = container_of(tt_common, struct batadv_tt_global_entry, common); + /* compute the CRC only for entries belonging to the + * VLAN identified by the vid passed as parameter + */ + if (tt_common->vid != vid) + continue; + /* Roaming clients are in the global table for * consistency only. They don't have to be * taken into account while computing the @@ -1593,6 +1998,13 @@ static uint32_t batadv_tt_global_crc(struct batadv_priv *bat_priv, crc_tmp = crc32c(0, &tt_common->vid, sizeof(tt_common->vid)); + + /* compute the CRC on flags that have to be kept in sync + * among nodes + */ + flags = tt_common->flags & BATADV_TT_SYNC_MASK; + crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags)); + crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN); } rcu_read_unlock(); @@ -1604,24 +2016,33 @@ static uint32_t batadv_tt_global_crc(struct batadv_priv *bat_priv, /** * batadv_tt_local_crc - calculates the checksum of the local table * @bat_priv: the bat priv with all the soft interface information + * @vid: VLAN identifier for which the CRC32 has to be computed * * For details about the computation, please refer to the documentation for * batadv_tt_global_crc(). * * Returns the checksum of the local table */ -static uint32_t batadv_tt_local_crc(struct batadv_priv *bat_priv) +static uint32_t batadv_tt_local_crc(struct batadv_priv *bat_priv, + unsigned short vid) { struct batadv_hashtable *hash = bat_priv->tt.local_hash; struct batadv_tt_common_entry *tt_common; struct hlist_head *head; uint32_t i, crc_tmp, crc = 0; + uint8_t flags; for (i = 0; i < hash->size; i++) { head = &hash->table[i]; rcu_read_lock(); hlist_for_each_entry_rcu(tt_common, head, hash_entry) { + /* compute the CRC only for entries belonging to the + * VLAN identified by vid + */ + if (tt_common->vid != vid) + continue; + /* not yet committed clients have not to be taken into * account while computing the CRC */ @@ -1630,6 +2051,13 @@ static uint32_t batadv_tt_local_crc(struct batadv_priv *bat_priv) crc_tmp = crc32c(0, &tt_common->vid, sizeof(tt_common->vid)); + + /* compute the CRC on flags that have to be kept in sync + * among nodes + */ + flags = tt_common->flags & BATADV_TT_SYNC_MASK; + crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags)); + crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN); } rcu_read_unlock(); @@ -1753,44 +2181,29 @@ static int batadv_tt_global_valid(const void *entry_ptr, } /** - * batadv_tt_tvlv_generate - creates tvlv tt data buffer to fill it with the - * tt entries from the specified tt hash + * batadv_tt_tvlv_generate - fill the tvlv buff with the tt entries from the + * specified tt hash * @bat_priv: the bat priv with all the soft interface information * @hash: hash table containing the tt entries * @tt_len: expected tvlv tt data buffer length in number of bytes + * @tvlv_buff: pointer to the buffer to fill with the TT data * @valid_cb: function to filter tt change entries * @cb_data: data passed to the filter function as argument - * - * Returns pointer to allocated tvlv tt data buffer if operation was - * successful or NULL otherwise. */ -static struct batadv_tvlv_tt_data * -batadv_tt_tvlv_generate(struct batadv_priv *bat_priv, - struct batadv_hashtable *hash, uint16_t tt_len, - int (*valid_cb)(const void *, const void *), - void *cb_data) +static void batadv_tt_tvlv_generate(struct batadv_priv *bat_priv, + struct batadv_hashtable *hash, + void *tvlv_buff, uint16_t tt_len, + int (*valid_cb)(const void *, const void *), + void *cb_data) { struct batadv_tt_common_entry *tt_common_entry; - struct batadv_tvlv_tt_data *tvlv_tt_data = NULL; struct batadv_tvlv_tt_change *tt_change; struct hlist_head *head; uint16_t tt_tot, tt_num_entries = 0; - ssize_t tvlv_tt_size = sizeof(struct batadv_tvlv_tt_data); uint32_t i; - if (tvlv_tt_size + tt_len > bat_priv->soft_iface->mtu) { - tt_len = bat_priv->soft_iface->mtu - tvlv_tt_size; - tt_len -= tt_len % sizeof(struct batadv_tvlv_tt_change); - } - tt_tot = batadv_tt_entries(tt_len); - - tvlv_tt_data = kzalloc(sizeof(*tvlv_tt_data) + tt_len, - GFP_ATOMIC); - if (!tvlv_tt_data) - goto out; - - tt_change = (struct batadv_tvlv_tt_change *)(tvlv_tt_data + 1); + tt_change = (struct batadv_tvlv_tt_change *)tvlv_buff; rcu_read_lock(); for (i = 0; i < hash->size; i++) { @@ -1815,9 +2228,91 @@ batadv_tt_tvlv_generate(struct batadv_priv *bat_priv, } } rcu_read_unlock(); +} -out: - return tvlv_tt_data; +/** + * batadv_tt_global_check_crc - check if all the CRCs are correct + * @orig_node: originator for which the CRCs have to be checked + * @tt_vlan: pointer to the first tvlv VLAN entry + * @num_vlan: number of tvlv VLAN entries + * @create: if true, create VLAN objects if not found + * + * Return true if all the received CRCs match the locally stored ones, false + * otherwise + */ +static bool batadv_tt_global_check_crc(struct batadv_orig_node *orig_node, + struct batadv_tvlv_tt_vlan_data *tt_vlan, + uint16_t num_vlan) +{ + struct batadv_tvlv_tt_vlan_data *tt_vlan_tmp; + struct batadv_orig_node_vlan *vlan; + int i; + + /* check if each received CRC matches the locally stored one */ + for (i = 0; i < num_vlan; i++) { + tt_vlan_tmp = tt_vlan + i; + + /* if orig_node is a backbone node for this VLAN, don't check + * the CRC as we ignore all the global entries over it + */ + if (batadv_bla_is_backbone_gw_orig(orig_node->bat_priv, + orig_node->orig, + ntohs(tt_vlan_tmp->vid))) + continue; + + vlan = batadv_orig_node_vlan_get(orig_node, + ntohs(tt_vlan_tmp->vid)); + if (!vlan) + return false; + + if (vlan->tt.crc != ntohl(tt_vlan_tmp->crc)) + return false; + } + + return true; +} + +/** + * batadv_tt_local_update_crc - update all the local CRCs + * @bat_priv: the bat priv with all the soft interface information + */ +static void batadv_tt_local_update_crc(struct batadv_priv *bat_priv) +{ + struct batadv_softif_vlan *vlan; + + /* recompute the global CRC for each VLAN */ + rcu_read_lock(); + hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) { + vlan->tt.crc = batadv_tt_local_crc(bat_priv, vlan->vid); + } + rcu_read_unlock(); +} + +/** + * batadv_tt_global_update_crc - update all the global CRCs for this orig_node + * @bat_priv: the bat priv with all the soft interface information + * @orig_node: the orig_node for which the CRCs have to be updated + */ +static void batadv_tt_global_update_crc(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig_node) +{ + struct batadv_orig_node_vlan *vlan; + uint32_t crc; + + /* recompute the global CRC for each VLAN */ + rcu_read_lock(); + list_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) { + /* if orig_node is a backbone node for this VLAN, don't compute + * the CRC as we ignore all the global entries over it + */ + if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig, + vlan->vid)) + continue; + + crc = batadv_tt_global_crc(bat_priv, orig_node, vlan->vid); + vlan->tt.crc = crc; + } + rcu_read_unlock(); } /** @@ -1825,19 +2320,23 @@ out: * @bat_priv: the bat priv with all the soft interface information * @dst_orig_node: the destination of the message * @ttvn: the version number that the source of the message is looking for - * @tt_crc: the CRC associated with the version number + * @tt_vlan: pointer to the first tvlv VLAN object to request + * @num_vlan: number of tvlv VLAN entries * @full_table: ask for the entire translation table if true, while only for the * last TT diff otherwise */ static int batadv_send_tt_request(struct batadv_priv *bat_priv, struct batadv_orig_node *dst_orig_node, - uint8_t ttvn, uint32_t tt_crc, - bool full_table) + uint8_t ttvn, + struct batadv_tvlv_tt_vlan_data *tt_vlan, + uint16_t num_vlan, bool full_table) { struct batadv_tvlv_tt_data *tvlv_tt_data = NULL; - struct batadv_hard_iface *primary_if; struct batadv_tt_req_node *tt_req_node = NULL; + struct batadv_tvlv_tt_vlan_data *tt_vlan_req; + struct batadv_hard_iface *primary_if; bool ret = false; + int i, size; primary_if = batadv_primary_if_get_selected(bat_priv); if (!primary_if) @@ -1850,13 +2349,26 @@ static int batadv_send_tt_request(struct batadv_priv *bat_priv, if (!tt_req_node) goto out; - tvlv_tt_data = kzalloc(sizeof(*tvlv_tt_data), GFP_ATOMIC); + size = sizeof(*tvlv_tt_data) + sizeof(*tt_vlan_req) * num_vlan; + tvlv_tt_data = kzalloc(size, GFP_ATOMIC); if (!tvlv_tt_data) goto out; tvlv_tt_data->flags = BATADV_TT_REQUEST; tvlv_tt_data->ttvn = ttvn; - tvlv_tt_data->crc = htonl(tt_crc); + tvlv_tt_data->num_vlan = htons(num_vlan); + + /* send all the CRCs within the request. This is needed by intermediate + * nodes to ensure they have the correct table before replying + */ + tt_vlan_req = (struct batadv_tvlv_tt_vlan_data *)(tvlv_tt_data + 1); + for (i = 0; i < num_vlan; i++) { + tt_vlan_req->vid = tt_vlan->vid; + tt_vlan_req->crc = tt_vlan->crc; + + tt_vlan_req++; + tt_vlan++; + } if (full_table) tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE; @@ -1867,7 +2379,7 @@ static int batadv_send_tt_request(struct batadv_priv *bat_priv, batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_TX); batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr, dst_orig_node->orig, BATADV_TVLV_TT, 1, - tvlv_tt_data, sizeof(*tvlv_tt_data)); + tvlv_tt_data, size); ret = true; out: @@ -1899,10 +2411,13 @@ static bool batadv_send_other_tt_response(struct batadv_priv *bat_priv, { struct batadv_orig_node *req_dst_orig_node; struct batadv_orig_node *res_dst_orig_node = NULL; + struct batadv_tvlv_tt_change *tt_change; struct batadv_tvlv_tt_data *tvlv_tt_data = NULL; - uint8_t orig_ttvn, req_ttvn; - uint16_t tt_len; + struct batadv_tvlv_tt_vlan_data *tt_vlan; bool ret = false, full_table; + uint8_t orig_ttvn, req_ttvn; + uint16_t tvlv_len; + int32_t tt_len; batadv_dbg(BATADV_DBG_TT, bat_priv, "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n", @@ -1921,9 +2436,11 @@ static bool batadv_send_other_tt_response(struct batadv_priv *bat_priv, orig_ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn); req_ttvn = tt_data->ttvn; + tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1); /* this node doesn't have the requested data */ if (orig_ttvn != req_ttvn || - tt_data->crc != htonl(req_dst_orig_node->tt_crc)) + !batadv_tt_global_check_crc(req_dst_orig_node, tt_vlan, + ntohs(tt_data->num_vlan))) goto out; /* If the full table has been explicitly requested */ @@ -1940,26 +2457,43 @@ static bool batadv_send_other_tt_response(struct batadv_priv *bat_priv, spin_lock_bh(&req_dst_orig_node->tt_buff_lock); tt_len = req_dst_orig_node->tt_buff_len; - tvlv_tt_data = kzalloc(sizeof(*tvlv_tt_data) + tt_len, - GFP_ATOMIC); - if (!tvlv_tt_data) + tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node, + &tvlv_tt_data, + &tt_change, + &tt_len); + if (!tt_len) goto unlock; /* Copy the last orig_node's OGM buffer */ - memcpy(tvlv_tt_data + 1, req_dst_orig_node->tt_buff, + memcpy(tt_change, req_dst_orig_node->tt_buff, req_dst_orig_node->tt_buff_len); spin_unlock_bh(&req_dst_orig_node->tt_buff_lock); } else { - tt_len = (uint16_t)atomic_read(&req_dst_orig_node->tt_size); - tt_len = batadv_tt_len(tt_len); - - tvlv_tt_data = batadv_tt_tvlv_generate(bat_priv, - bat_priv->tt.global_hash, - tt_len, - batadv_tt_global_valid, - req_dst_orig_node); - if (!tvlv_tt_data) + /* allocate the tvlv, put the tt_data and all the tt_vlan_data + * in the initial part + */ + tt_len = -1; + tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node, + &tvlv_tt_data, + &tt_change, + &tt_len); + if (!tt_len) goto out; + + /* fill the rest of the tvlv with the real TT entries */ + batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.global_hash, + tt_change, tt_len, + batadv_tt_global_valid, + req_dst_orig_node); + } + + /* Don't send the response, if larger than fragmented packet. */ + tt_len = sizeof(struct batadv_unicast_tvlv_packet) + tvlv_len; + if (tt_len > atomic_read(&bat_priv->packet_size_max)) { + net_ratelimited_function(batadv_info, bat_priv->soft_iface, + "Ignoring TT_REQUEST from %pM; Response size exceeds max packet size.\n", + res_dst_orig_node->orig); + goto out; } tvlv_tt_data->flags = BATADV_TT_RESPONSE; @@ -1976,8 +2510,8 @@ static bool batadv_send_other_tt_response(struct batadv_priv *bat_priv, batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX); batadv_tvlv_unicast_send(bat_priv, req_dst_orig_node->orig, - req_src, BATADV_TVLV_TT, 1, - tvlv_tt_data, sizeof(*tvlv_tt_data) + tt_len); + req_src, BATADV_TVLV_TT, 1, tvlv_tt_data, + tvlv_len); ret = true; goto out; @@ -2008,17 +2542,20 @@ static bool batadv_send_my_tt_response(struct batadv_priv *bat_priv, uint8_t *req_src) { struct batadv_tvlv_tt_data *tvlv_tt_data = NULL; - struct batadv_orig_node *orig_node; struct batadv_hard_iface *primary_if = NULL; + struct batadv_tvlv_tt_change *tt_change; + struct batadv_orig_node *orig_node; uint8_t my_ttvn, req_ttvn; + uint16_t tvlv_len; bool full_table; - uint16_t tt_len; + int32_t tt_len; batadv_dbg(BATADV_DBG_TT, bat_priv, "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n", req_src, tt_data->ttvn, (tt_data->flags & BATADV_TT_FULL_TABLE ? 'F' : '.')); + spin_lock_bh(&bat_priv->tt.commit_lock); my_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn); req_ttvn = tt_data->ttvn; @@ -2045,29 +2582,37 @@ static bool batadv_send_my_tt_response(struct batadv_priv *bat_priv, */ if (!full_table) { spin_lock_bh(&bat_priv->tt.last_changeset_lock); - tt_len = bat_priv->tt.last_changeset_len; - tvlv_tt_data = kzalloc(sizeof(*tvlv_tt_data) + tt_len, - GFP_ATOMIC); - if (!tvlv_tt_data) + tt_len = bat_priv->tt.last_changeset_len; + tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv, + &tvlv_tt_data, + &tt_change, + &tt_len); + if (!tt_len) goto unlock; /* Copy the last orig_node's OGM buffer */ - memcpy(tvlv_tt_data + 1, bat_priv->tt.last_changeset, + memcpy(tt_change, bat_priv->tt.last_changeset, bat_priv->tt.last_changeset_len); spin_unlock_bh(&bat_priv->tt.last_changeset_lock); } else { - tt_len = (uint16_t)atomic_read(&bat_priv->tt.local_entry_num); - tt_len = batadv_tt_len(tt_len); req_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn); - tvlv_tt_data = batadv_tt_tvlv_generate(bat_priv, - bat_priv->tt.local_hash, - tt_len, - batadv_tt_local_valid, - NULL); - if (!tvlv_tt_data) + /* allocate the tvlv, put the tt_data and all the tt_vlan_data + * in the initial part + */ + tt_len = -1; + tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv, + &tvlv_tt_data, + &tt_change, + &tt_len); + if (!tt_len) goto out; + + /* fill the rest of the tvlv with the real TT entries */ + batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.local_hash, + tt_change, tt_len, + batadv_tt_local_valid, NULL); } tvlv_tt_data->flags = BATADV_TT_RESPONSE; @@ -2083,14 +2628,15 @@ static bool batadv_send_my_tt_response(struct batadv_priv *bat_priv, batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX); batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr, - req_src, BATADV_TVLV_TT, 1, - tvlv_tt_data, sizeof(*tvlv_tt_data) + tt_len); + req_src, BATADV_TVLV_TT, 1, tvlv_tt_data, + tvlv_len); goto out; unlock: spin_unlock_bh(&bat_priv->tt.last_changeset_lock); out: + spin_unlock_bh(&bat_priv->tt.commit_lock); if (orig_node) batadv_orig_node_free_ref(orig_node); if (primary_if) @@ -2113,16 +2659,11 @@ static bool batadv_send_tt_response(struct batadv_priv *bat_priv, struct batadv_tvlv_tt_data *tt_data, uint8_t *req_src, uint8_t *req_dst) { - if (batadv_is_my_mac(bat_priv, req_dst)) { - /* don't answer backbone gws! */ - if (batadv_bla_is_backbone_gw_orig(bat_priv, req_src)) - return true; - + if (batadv_is_my_mac(bat_priv, req_dst)) return batadv_send_my_tt_response(bat_priv, tt_data, req_src); - } else { + else return batadv_send_other_tt_response(bat_priv, tt_data, req_src, req_dst); - } } static void _batadv_tt_update_changes(struct batadv_priv *bat_priv, @@ -2159,8 +2700,9 @@ static void _batadv_tt_update_changes(struct batadv_priv *bat_priv, } static void batadv_tt_fill_gtable(struct batadv_priv *bat_priv, - struct batadv_tvlv_tt_data *tt_data, - uint8_t *resp_src, uint16_t num_entries) + struct batadv_tvlv_tt_change *tt_change, + uint8_t ttvn, uint8_t *resp_src, + uint16_t num_entries) { struct batadv_orig_node *orig_node; @@ -2169,11 +2711,11 @@ static void batadv_tt_fill_gtable(struct batadv_priv *bat_priv, goto out; /* Purge the old table first.. */ - batadv_tt_global_del_orig(bat_priv, orig_node, "Received full table"); + batadv_tt_global_del_orig(bat_priv, orig_node, -1, + "Received full table"); - _batadv_tt_update_changes(bat_priv, orig_node, - (struct batadv_tvlv_tt_change *)(tt_data + 1), - num_entries, tt_data->ttvn); + _batadv_tt_update_changes(bat_priv, orig_node, tt_change, num_entries, + ttvn); spin_lock_bh(&orig_node->tt_buff_lock); kfree(orig_node->tt_buff); @@ -2181,7 +2723,7 @@ static void batadv_tt_fill_gtable(struct batadv_priv *bat_priv, orig_node->tt_buff = NULL; spin_unlock_bh(&orig_node->tt_buff_lock); - atomic_set(&orig_node->last_ttvn, tt_data->ttvn); + atomic_set(&orig_node->last_ttvn, ttvn); out: if (orig_node) @@ -2245,28 +2787,39 @@ static void batadv_handle_tt_response(struct batadv_priv *bat_priv, struct batadv_tt_req_node *node, *safe; struct batadv_orig_node *orig_node = NULL; struct batadv_tvlv_tt_change *tt_change; + uint8_t *tvlv_ptr = (uint8_t *)tt_data; + uint16_t change_offset; batadv_dbg(BATADV_DBG_TT, bat_priv, "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n", resp_src, tt_data->ttvn, num_entries, (tt_data->flags & BATADV_TT_FULL_TABLE ? 'F' : '.')); - /* we should have never asked a backbone gw */ - if (batadv_bla_is_backbone_gw_orig(bat_priv, resp_src)) - goto out; - orig_node = batadv_orig_hash_find(bat_priv, resp_src); if (!orig_node) goto out; + spin_lock_bh(&orig_node->tt_lock); + + change_offset = sizeof(struct batadv_tvlv_tt_vlan_data); + change_offset *= ntohs(tt_data->num_vlan); + change_offset += sizeof(*tt_data); + tvlv_ptr += change_offset; + + tt_change = (struct batadv_tvlv_tt_change *)tvlv_ptr; if (tt_data->flags & BATADV_TT_FULL_TABLE) { - batadv_tt_fill_gtable(bat_priv, tt_data, resp_src, num_entries); + batadv_tt_fill_gtable(bat_priv, tt_change, tt_data->ttvn, + resp_src, num_entries); } else { - tt_change = (struct batadv_tvlv_tt_change *)(tt_data + 1); batadv_tt_update_changes(bat_priv, orig_node, num_entries, tt_data->ttvn, tt_change); } + /* Recalculate the CRC for this orig_node and store it */ + batadv_tt_global_update_crc(bat_priv, orig_node); + + spin_unlock_bh(&orig_node->tt_lock); + /* Delete the tt_req_node from pending tt_requests list */ spin_lock_bh(&bat_priv->tt.req_list_lock); list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) { @@ -2275,10 +2828,8 @@ static void batadv_handle_tt_response(struct batadv_priv *bat_priv, list_del(&node->list); kfree(node); } - spin_unlock_bh(&bat_priv->tt.req_list_lock); - /* Recalculate the CRC for this orig_node and store it */ - orig_node->tt_crc = batadv_tt_global_crc(bat_priv, orig_node); + spin_unlock_bh(&bat_priv->tt.req_list_lock); out: if (orig_node) batadv_orig_node_free_ref(orig_node); @@ -2421,7 +2972,7 @@ static void batadv_tt_purge(struct work_struct *work) priv_tt = container_of(delayed_work, struct batadv_priv_tt, work); bat_priv = container_of(priv_tt, struct batadv_priv, tt); - batadv_tt_local_purge(bat_priv); + batadv_tt_local_purge(bat_priv, BATADV_TT_LOCAL_TIMEOUT); batadv_tt_global_purge(bat_priv); batadv_tt_req_purge(bat_priv); batadv_tt_roam_purge(bat_priv); @@ -2446,19 +2997,25 @@ void batadv_tt_free(struct batadv_priv *bat_priv) kfree(bat_priv->tt.last_changeset); } -/* This function will enable or disable the specified flags for all the entries - * in the given hash table and returns the number of modified entries +/** + * batadv_tt_local_set_flags - set or unset the specified flags on the local + * table and possibly count them in the TT size + * @bat_priv: the bat priv with all the soft interface information + * @flags: the flag to switch + * @enable: whether to set or unset the flag + * @count: whether to increase the TT size by the number of changed entries */ -static uint16_t batadv_tt_set_flags(struct batadv_hashtable *hash, - uint16_t flags, bool enable) +static void batadv_tt_local_set_flags(struct batadv_priv *bat_priv, + uint16_t flags, bool enable, bool count) { - uint32_t i; + struct batadv_hashtable *hash = bat_priv->tt.local_hash; + struct batadv_tt_common_entry *tt_common_entry; uint16_t changed_num = 0; struct hlist_head *head; - struct batadv_tt_common_entry *tt_common_entry; + uint32_t i; if (!hash) - goto out; + return; for (i = 0; i < hash->size; i++) { head = &hash->table[i]; @@ -2476,11 +3033,15 @@ static uint16_t batadv_tt_set_flags(struct batadv_hashtable *hash, tt_common_entry->flags &= ~flags; } changed_num++; + + if (!count) + continue; + + batadv_tt_local_size_inc(bat_priv, + tt_common_entry->vid); } rcu_read_unlock(); } -out: - return changed_num; } /* Purge out all the tt local entries marked with BATADV_TT_CLIENT_PENDING */ @@ -2512,7 +3073,7 @@ static void batadv_tt_local_purge_pending_clients(struct batadv_priv *bat_priv) tt_common->addr, BATADV_PRINT_VID(tt_common->vid)); - atomic_dec(&bat_priv->tt.local_entry_num); + batadv_tt_local_size_dec(bat_priv, tt_common->vid); hlist_del_rcu(&tt_common->hash_entry); tt_local = container_of(tt_common, struct batadv_tt_local_entry, @@ -2524,27 +3085,24 @@ static void batadv_tt_local_purge_pending_clients(struct batadv_priv *bat_priv) } /** - * batadv_tt_local_commit_changes - commit all pending local tt changes which - * have been queued in the time since the last commit + * batadv_tt_local_commit_changes_nolock - commit all pending local tt changes + * which have been queued in the time since the last commit * @bat_priv: the bat priv with all the soft interface information + * + * Caller must hold tt->commit_lock. */ -void batadv_tt_local_commit_changes(struct batadv_priv *bat_priv) +static void batadv_tt_local_commit_changes_nolock(struct batadv_priv *bat_priv) { - uint16_t changed_num = 0; - if (atomic_read(&bat_priv->tt.local_changes) < 1) { if (!batadv_atomic_dec_not_zero(&bat_priv->tt.ogm_append_cnt)) batadv_tt_tvlv_container_update(bat_priv); return; } - changed_num = batadv_tt_set_flags(bat_priv->tt.local_hash, - BATADV_TT_CLIENT_NEW, false); + batadv_tt_local_set_flags(bat_priv, BATADV_TT_CLIENT_NEW, false, true); - /* all reset entries have to be counted as local entries */ - atomic_add(changed_num, &bat_priv->tt.local_entry_num); batadv_tt_local_purge_pending_clients(bat_priv); - bat_priv->tt.local_crc = batadv_tt_local_crc(bat_priv); + batadv_tt_local_update_crc(bat_priv); /* Increment the TTVN only once per OGM interval */ atomic_inc(&bat_priv->tt.vn); @@ -2557,6 +3115,18 @@ void batadv_tt_local_commit_changes(struct batadv_priv *bat_priv) batadv_tt_tvlv_container_update(bat_priv); } +/** + * batadv_tt_local_commit_changes - commit all pending local tt changes which + * have been queued in the time since the last commit + * @bat_priv: the bat priv with all the soft interface information + */ +void batadv_tt_local_commit_changes(struct batadv_priv *bat_priv) +{ + spin_lock_bh(&bat_priv->tt.commit_lock); + batadv_tt_local_commit_changes_nolock(bat_priv); + spin_unlock_bh(&bat_priv->tt.commit_lock); +} + bool batadv_is_ap_isolated(struct batadv_priv *bat_priv, uint8_t *src, uint8_t *dst, unsigned short vid) { @@ -2597,25 +3167,24 @@ out: * information received via ogms * @bat_priv: the bat priv with all the soft interface information * @orig: the orig_node of the ogm - * @tt_buff: buffer holding the tt information + * @tt_vlan: pointer to the first tvlv VLAN entry + * @tt_num_vlan: number of tvlv VLAN entries + * @tt_change: pointer to the first entry in the TT buffer * @tt_num_changes: number of tt changes inside the tt buffer * @ttvn: translation table version number of this changeset * @tt_crc: crc32 checksum of orig node's translation table */ static void batadv_tt_update_orig(struct batadv_priv *bat_priv, struct batadv_orig_node *orig_node, - const unsigned char *tt_buff, - uint16_t tt_num_changes, uint8_t ttvn, - uint32_t tt_crc) + const void *tt_buff, uint16_t tt_num_vlan, + struct batadv_tvlv_tt_change *tt_change, + uint16_t tt_num_changes, uint8_t ttvn) { uint8_t orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn); + struct batadv_tvlv_tt_vlan_data *tt_vlan; bool full_table = true; - struct batadv_tvlv_tt_change *tt_change; - - /* don't care about a backbone gateways updates. */ - if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig)) - return; + tt_vlan = (struct batadv_tvlv_tt_vlan_data *)tt_buff; /* orig table not initialised AND first diff is in the OGM OR the ttvn * increased by one -> we can apply the attached changes */ @@ -2631,6 +3200,8 @@ static void batadv_tt_update_orig(struct batadv_priv *bat_priv, goto request_table; } + spin_lock_bh(&orig_node->tt_lock); + tt_change = (struct batadv_tvlv_tt_change *)tt_buff; batadv_tt_update_changes(bat_priv, orig_node, tt_num_changes, ttvn, tt_change); @@ -2639,7 +3210,9 @@ static void batadv_tt_update_orig(struct batadv_priv *bat_priv, * prefer to recompute it to spot any possible inconsistency * in the global table */ - orig_node->tt_crc = batadv_tt_global_crc(bat_priv, orig_node); + batadv_tt_global_update_crc(bat_priv, orig_node); + + spin_unlock_bh(&orig_node->tt_lock); /* The ttvn alone is not enough to guarantee consistency * because a single value could represent different states @@ -2650,21 +3223,24 @@ static void batadv_tt_update_orig(struct batadv_priv *bat_priv, * checking the CRC value is mandatory to detect the * inconsistency */ - if (orig_node->tt_crc != tt_crc) + if (!batadv_tt_global_check_crc(orig_node, tt_vlan, + tt_num_vlan)) goto request_table; } else { /* if we missed more than one change or our tables are not * in sync anymore -> request fresh tt data */ if (!orig_node->tt_initialised || ttvn != orig_ttvn || - orig_node->tt_crc != tt_crc) { + !batadv_tt_global_check_crc(orig_node, tt_vlan, + tt_num_vlan)) { request_table: batadv_dbg(BATADV_DBG_TT, bat_priv, - "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u crc: %#.8x last_crc: %#.8x num_changes: %u)\n", - orig_node->orig, ttvn, orig_ttvn, tt_crc, - orig_node->tt_crc, tt_num_changes); + "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u num_changes: %u)\n", + orig_node->orig, ttvn, orig_ttvn, + tt_num_changes); batadv_send_tt_request(bat_priv, orig_node, ttvn, - tt_crc, full_table); + tt_vlan, tt_num_vlan, + full_table); return; } } @@ -2729,13 +3305,6 @@ bool batadv_tt_add_temporary_global_entry(struct batadv_priv *bat_priv, { bool ret = false; - /* if the originator is a backbone node (meaning it belongs to the same - * LAN of this node) the temporary client must not be added because to - * reach such destination the node must use the LAN instead of the mesh - */ - if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig)) - goto out; - if (!batadv_tt_global_add(bat_priv, orig_node, addr, vid, BATADV_TT_CLIENT_TEMP, atomic_read(&orig_node->last_ttvn))) @@ -2749,6 +3318,47 @@ out: return ret; } +/** + * batadv_tt_local_resize_to_mtu - resize the local translation table fit the + * maximum packet size that can be transported through the mesh + * @soft_iface: netdev struct of the mesh interface + * + * Remove entries older than 'timeout' and half timeout if more entries need + * to be removed. + */ +void batadv_tt_local_resize_to_mtu(struct net_device *soft_iface) +{ + struct batadv_priv *bat_priv = netdev_priv(soft_iface); + int packet_size_max = atomic_read(&bat_priv->packet_size_max); + int table_size, timeout = BATADV_TT_LOCAL_TIMEOUT / 2; + bool reduced = false; + + spin_lock_bh(&bat_priv->tt.commit_lock); + + while (true) { + table_size = batadv_tt_local_table_transmit_size(bat_priv); + if (packet_size_max >= table_size) + break; + + batadv_tt_local_purge(bat_priv, timeout); + batadv_tt_local_purge_pending_clients(bat_priv); + + timeout /= 2; + reduced = true; + net_ratelimited_function(batadv_info, soft_iface, + "Forced to purge local tt entries to fit new maximum fragment MTU (%i)\n", + packet_size_max); + } + + /* commit these changes immediately, to avoid synchronization problem + * with the TTVN + */ + if (reduced) + batadv_tt_local_commit_changes_nolock(bat_priv); + + spin_unlock_bh(&bat_priv->tt.commit_lock); +} + /** * batadv_tt_tvlv_ogm_handler_v1 - process incoming tt tvlv container * @bat_priv: the bat priv with all the soft interface information @@ -2759,12 +3369,13 @@ out: */ static void batadv_tt_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv, struct batadv_orig_node *orig, - uint8_t flags, - void *tvlv_value, + uint8_t flags, void *tvlv_value, uint16_t tvlv_value_len) { + struct batadv_tvlv_tt_vlan_data *tt_vlan; + struct batadv_tvlv_tt_change *tt_change; struct batadv_tvlv_tt_data *tt_data; - uint16_t num_entries; + uint16_t num_entries, num_vlan; if (tvlv_value_len < sizeof(*tt_data)) return; @@ -2772,11 +3383,19 @@ static void batadv_tt_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv, tt_data = (struct batadv_tvlv_tt_data *)tvlv_value; tvlv_value_len -= sizeof(*tt_data); + num_vlan = ntohs(tt_data->num_vlan); + + if (tvlv_value_len < sizeof(*tt_vlan) * num_vlan) + return; + + tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1); + tt_change = (struct batadv_tvlv_tt_change *)(tt_vlan + num_vlan); + tvlv_value_len -= sizeof(*tt_vlan) * num_vlan; + num_entries = batadv_tt_entries(tvlv_value_len); - batadv_tt_update_orig(bat_priv, orig, - (unsigned char *)(tt_data + 1), - num_entries, tt_data->ttvn, ntohl(tt_data->crc)); + batadv_tt_update_orig(bat_priv, orig, tt_vlan, num_vlan, tt_change, + num_entries, tt_data->ttvn); } /** @@ -2797,7 +3416,7 @@ static int batadv_tt_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv, uint16_t tvlv_value_len) { struct batadv_tvlv_tt_data *tt_data; - uint16_t num_entries; + uint16_t tt_vlan_len, tt_num_entries; char tt_flag; bool ret; @@ -2807,7 +3426,14 @@ static int batadv_tt_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv, tt_data = (struct batadv_tvlv_tt_data *)tvlv_value; tvlv_value_len -= sizeof(*tt_data); - num_entries = batadv_tt_entries(tvlv_value_len); + tt_vlan_len = sizeof(struct batadv_tvlv_tt_vlan_data); + tt_vlan_len *= ntohs(tt_data->num_vlan); + + if (tvlv_value_len < tt_vlan_len) + return NET_RX_SUCCESS; + + tvlv_value_len -= tt_vlan_len; + tt_num_entries = batadv_tt_entries(tvlv_value_len); switch (tt_data->flags & BATADV_TT_DATA_TYPE_MASK) { case BATADV_TT_REQUEST: @@ -2835,7 +3461,7 @@ static int batadv_tt_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv, if (batadv_is_my_mac(bat_priv, dst)) { batadv_handle_tt_response(bat_priv, tt_data, - src, num_entries); + src, tt_num_entries); return NET_RX_SUCCESS; } @@ -2880,13 +3506,6 @@ static int batadv_roam_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv, if (!batadv_is_my_mac(bat_priv, dst)) return NET_RX_DROP; - /* check if it is a backbone gateway. we don't accept - * roaming advertisement from it, as it has the same - * entries as we have. - */ - if (batadv_bla_is_backbone_gw_orig(bat_priv, src)) - goto out; - if (tvlv_value_len < sizeof(*roaming_adv)) goto out; @@ -2921,6 +3540,9 @@ int batadv_tt_init(struct batadv_priv *bat_priv) { int ret; + /* synchronized flags must be remote */ + BUILD_BUG_ON(!(BATADV_TT_SYNC_MASK & BATADV_TT_REMOTE_MASK)); + ret = batadv_tt_local_init(bat_priv); if (ret < 0) return ret;