B.A.T.M.A.N April 2014

b.a.t.m.a.n@lists.open-mesh.org

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33 discussions

[B.A.T.M.A.N.] [PATCH 1/2] batman-adv: Fix broadcast+ogm queue purging race condition
by Linus Lüssing 22 Jul '16

22 Jul '16

So far on purging broadcast and ogm queues we temporarily give up the spin lock of these queues to be able to cancel any scheduled forwarding work. However this is unsafe and can lead to a general protection error in batadv_purge_outstanding_packets(). With this patch we split the queue purging into two steps: First removing forward packets from those queues and signaling the cancelation. Secondly, we are actively canceling any scheduled forwarding, wait for any running forwarding to finish and only free a forw_packet afterwards. Signed-off-by: Linus Lüssing <linus.luessing(a)web.de> --- Fixes issue #168 send.c | 117 ++++++++++++++++++++++++++++++++++++++------------------------- types.h | 1 + 2 files changed, 71 insertions(+), 47 deletions(-) diff --git a/send.c b/send.c index 0a0bb45..f93476b 100644 --- a/send.c +++ b/send.c @@ -245,6 +245,10 @@ static void batadv_send_outstanding_bcast_packet(struct work_struct *work) bat_priv = netdev_priv(soft_iface); spin_lock_bh(&bat_priv->forw_bcast_list_lock); + if (hlist_unhashed(&forw_packet->list)) { + spin_unlock_bh(&bat_priv->forw_bcast_list_lock); + return; + } hlist_del(&forw_packet->list); spin_unlock_bh(&bat_priv->forw_bcast_list_lock); @@ -293,6 +297,10 @@ void batadv_send_outstanding_bat_ogm_packet(struct work_struct *work) delayed_work); bat_priv = netdev_priv(forw_packet->if_incoming->soft_iface); spin_lock_bh(&bat_priv->forw_bat_list_lock); + if (hlist_unhashed(&forw_packet->list)) { + spin_unlock_bh(&bat_priv->forw_bat_list_lock); + return; + } hlist_del(&forw_packet->list); spin_unlock_bh(&bat_priv->forw_bat_list_lock); @@ -316,13 +324,68 @@ out: batadv_forw_packet_free(forw_packet); } +/** + * batadv_cancel_packets - Cancels a list of forward packets + * @forw_list: The to be canceled forward packets + * @canceled_list: The backup list. + * + * This canceles any scheduled forwarding packet tasks in the provided + * forw_list. The packets are being moved from the forw_list to the + * canceled_list afterwards to unhash the forward packet list pointer, + * allowing any already running task to notice the cancelation. + */ +static void batadv_cancel_packets(struct hlist_head *forw_list, + struct hlist_head *canceled_list, + const struct batadv_hard_iface *hard_iface) +{ + struct batadv_forw_packet *forw_packet; + struct hlist_node *tmp_node, *safe_tmp_node; + + hlist_for_each_entry_safe(forw_packet, tmp_node, safe_tmp_node, + forw_list, list) { + /* if purge_outstanding_packets() was called with an argument + * we delete only packets belonging to the given interface + */ + if ((hard_iface) && + (forw_packet->if_incoming != hard_iface)) + continue; + + hlist_del_init(&forw_packet->list); + hlist_add_head(&forw_packet->canceled_list, canceled_list); + } +} + +/** + * batadv_canceled_packets_free - Frees canceled forward packets + * @head: A list of to be freed forw_packets + * + * This function canceles the scheduling of any packet in the provided list, + * waits for any possibly running packet forwarding thread to finish and + * finally, safely frees this forward packet. + * + * This function might sleep. + */ +static void batadv_canceled_packets_free(struct hlist_head *head) +{ + struct batadv_forw_packet *forw_packet; + struct hlist_node *tmp_node, *safe_tmp_node; + + hlist_for_each_entry_safe(forw_packet, tmp_node, safe_tmp_node, head, + canceled_list) { + cancel_delayed_work_sync(&forw_packet->delayed_work); + + hlist_del(&forw_packet->canceled_list); + batadv_forw_packet_free(forw_packet); + } +} + void batadv_purge_outstanding_packets(struct batadv_priv *bat_priv, const struct batadv_hard_iface *hard_iface) { - struct batadv_forw_packet *forw_packet; - struct hlist_node *tmp_node, *safe_tmp_node; - bool pending; + struct hlist_head head; + + INIT_HLIST_HEAD(&head); if (hard_iface) batadv_dbg(BATADV_DBG_BATMAN, bat_priv, @@ -334,53 +397,13 @@ batadv_purge_outstanding_packets(struct batadv_priv *bat_priv, /* free bcast list */ spin_lock_bh(&bat_priv->forw_bcast_list_lock); - hlist_for_each_entry_safe(forw_packet, tmp_node, safe_tmp_node, - &bat_priv->forw_bcast_list, list) { - /* if purge_outstanding_packets() was called with an argument - * we delete only packets belonging to the given interface - */ - if ((hard_iface) && - (forw_packet->if_incoming != hard_iface)) - continue; - - spin_unlock_bh(&bat_priv->forw_bcast_list_lock); - - /* batadv_send_outstanding_bcast_packet() will lock the list to - * delete the item from the list - */ - pending = cancel_delayed_work_sync(&forw_packet->delayed_work); - spin_lock_bh(&bat_priv->forw_bcast_list_lock); - - if (pending) { - hlist_del(&forw_packet->list); - batadv_forw_packet_free(forw_packet); - } - } + batadv_cancel_packets(&bat_priv->forw_bcast_list, &head, hard_iface); spin_unlock_bh(&bat_priv->forw_bcast_list_lock); /* free batman packet list */ spin_lock_bh(&bat_priv->forw_bat_list_lock); - hlist_for_each_entry_safe(forw_packet, tmp_node, safe_tmp_node, - &bat_priv->forw_bat_list, list) { - /* if purge_outstanding_packets() was called with an argument - * we delete only packets belonging to the given interface - */ - if ((hard_iface) && - (forw_packet->if_incoming != hard_iface)) - continue; - - spin_unlock_bh(&bat_priv->forw_bat_list_lock); - - /* send_outstanding_bat_packet() will lock the list to - * delete the item from the list - */ - pending = cancel_delayed_work_sync(&forw_packet->delayed_work); - spin_lock_bh(&bat_priv->forw_bat_list_lock); - - if (pending) { - hlist_del(&forw_packet->list); - batadv_forw_packet_free(forw_packet); - } - } + batadv_cancel_packets(&bat_priv->forw_bat_list, &head, hard_iface); spin_unlock_bh(&bat_priv->forw_bat_list_lock); + + batadv_canceled_packets_free(&head); } diff --git a/types.h b/types.h index aba8364..f62a35f 100644 --- a/types.h +++ b/types.h @@ -853,6 +853,7 @@ struct batadv_skb_cb { */ struct batadv_forw_packet { struct hlist_node list; + struct hlist_node canceled_list; unsigned long send_time; uint8_t own; struct sk_buff *skb; -- 1.7.10.4

4 12

[B.A.T.M.A.N.] [PATCH 1/2] batman-adv: Fix broadcast queue limit on a removed interface
by Linus Lüssing 09 Apr '16

09 Apr '16

When removing a single interface while a broadcast or ogm packet is still pending then we will free the forward packet without releasing the queue slots again. This patch is supposed to fix this issue. Signed-off-by: Linus Lüssing <linus.luessing(a)web.de> --- send.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/send.c b/send.c index ed7072a..2d539d6 100644 --- a/send.c +++ b/send.c @@ -356,6 +356,9 @@ batadv_purge_outstanding_packets(struct batadv_priv *bat_priv, if (pending) { hlist_del(&forw_packet->list); + if (!forw_packet->own) + atomic_inc(&bat_priv->bcast_queue_left); + batadv_forw_packet_free(forw_packet); } } @@ -382,6 +385,9 @@ batadv_purge_outstanding_packets(struct batadv_priv *bat_priv, if (pending) { hlist_del(&forw_packet->list); + if (!forw_packet->own) + atomic_inc(&bat_priv->batman_queue_left); + batadv_forw_packet_free(forw_packet); } } -- 1.7.10.4

2 5

[B.A.T.M.A.N.] [RFC 1/6] batman-adv: Generalize DAT in order to support any type of data, not only IPv4
by mihail.costea2005＠gmail.com 20 Mar '16

20 Mar '16

From: Mihail Costea <mihail.costea90(a)gmail.com> Mades DAT support more types by making its data a void*, adding type field to dat_entry and adding data_type to necessary functions. This change is needed in order to make DAT support any type of data, like IPv6 too. Adds generic function for transforming DAT data to string. The function is used in order to avoid defining different debug messages for different DAT data types. For example, if we had IPv6 as a DAT data, then "%pI4" should be "%pI6c", but all the other text of the debug message would be the same. Also everything is memorized in a struct in order to avoid further switch cases for all types. Signed-off-by: Mihail Costea <mihail.costea90(a)gmail.com> Signed-off-by: Stefan Popa <Stefan.A.Popa(a)intel.com> Reviewed-by: Stefan Popa <Stefan.A.Popa(a)intel.com> --- distributed-arp-table.c | 197 +++++++++++++++++++++++++++++++++++------------ distributed-arp-table.h | 1 + types.h | 24 +++++- 3 files changed, 169 insertions(+), 53 deletions(-) diff --git a/distributed-arp-table.c b/distributed-arp-table.c index f2543c2..90565d0 100644 --- a/distributed-arp-table.c +++ b/distributed-arp-table.c @@ -31,9 +31,32 @@ #include "types.h" #include "translation-table.h" +static struct batadv_dat_type_info batadv_dat_types_info[] = { + { + .size = sizeof(__be32), + .str_fmt = "%pI4", + }, +}; + static void batadv_dat_purge(struct work_struct *work); /** + * batadv_dat_data_to_str: transforms DAT data to string + * @data: the DAT data + * @type: type of data + * @buf: the buf where the data string is stored + * @buf_len: buf length + * + * Returns buf. + */ +static char *batadv_dat_data_to_str(void *data, uint8_t type, + char *buf, size_t buf_len) +{ + snprintf(buf, buf_len, batadv_dat_types_info[type].str_fmt, data); +return buf; +} + +/** * batadv_dat_start_timer - initialise the DAT periodic worker * @bat_priv: the bat priv with all the soft interface information */ @@ -45,6 +68,19 @@ static void batadv_dat_start_timer(struct batadv_priv *bat_priv) } /** + * batadv_dat_entry_free_ref_rcu - free a dat entry using its rcu + * @rcu: the dat entry rcu + */ +static void batadv_dat_entry_free_ref_rcu(struct rcu_head *rcu) +{ + struct batadv_dat_entry *dat_entry; + + dat_entry = container_of(rcu, struct batadv_dat_entry, rcu); + kfree(dat_entry->data); + kfree(dat_entry); +} + +/** * batadv_dat_entry_free_ref - decrement the dat_entry refcounter and possibly * free it * @dat_entry: the entry to free @@ -52,7 +88,7 @@ static void batadv_dat_start_timer(struct batadv_priv *bat_priv) static void batadv_dat_entry_free_ref(struct batadv_dat_entry *dat_entry) { if (atomic_dec_and_test(&dat_entry->refcount)) - kfree_rcu(dat_entry, rcu); + call_rcu(&dat_entry->rcu, batadv_dat_entry_free_ref_rcu); } /** @@ -136,12 +172,21 @@ static void batadv_dat_purge(struct work_struct *work) * * Returns 1 if the two entries are the same, 0 otherwise. */ -static int batadv_compare_dat(const struct hlist_node *node, const void *data2) +static int batadv_compare_dat(const struct hlist_node *node, const void *data2) { - const void *data1 = container_of(node, struct batadv_dat_entry, - hash_entry); + struct batadv_dat_entry *dat_entry1 = + container_of(node, struct batadv_dat_entry, + hash_entry); + struct batadv_dat_entry *dat_entry2 = + container_of(data2, + struct batadv_dat_entry, data); + size_t data_size = batadv_dat_types_info[dat_entry1->type].size; - return (memcmp(data1, data2, sizeof(__be32)) == 0 ? 1 : 0); + if (dat_entry1->type != dat_entry2->type) + return 0; + + return (memcmp(dat_entry1->data, dat_entry2->data, + data_size) == 0 ? 1 : 0); } /** @@ -198,8 +243,9 @@ static __be32 batadv_arp_ip_dst(struct sk_buff *skb, int hdr_size) } /** - * batadv_hash_dat - compute the hash value for an IP address + * batadv_hash_dat - compute the hash value for a DAT data * @data: data to hash + * @data_type: type of data * @size: size of the hash table * * Returns the selected index in the hash table for the given data. @@ -209,7 +255,8 @@ static uint32_t batadv_hash_dat(const void *data, uint32_t size) uint32_t hash = 0; const struct batadv_dat_entry *dat = data; - hash = batadv_hash_bytes(hash, &dat->ip, sizeof(dat->ip)); + hash = batadv_hash_bytes(hash, dat->data, + batadv_dat_types_info[dat->type].size); hash = batadv_hash_bytes(hash, &dat->vid, sizeof(dat->vid)); hash += (hash << 3); @@ -223,32 +270,40 @@ static uint32_t batadv_hash_dat(const void *data, uint32_t size) * batadv_dat_entry_hash_find - look for a given dat_entry in the local hash * table * @bat_priv: the bat priv with all the soft interface information - * @ip: search key + * @data: search key + * @data_type: type of data * @vid: VLAN identifier * * Returns the dat_entry if found, NULL otherwise. */ static struct batadv_dat_entry * -batadv_dat_entry_hash_find(struct batadv_priv *bat_priv, __be32 ip, - unsigned short vid) +batadv_dat_entry_hash_find(struct batadv_priv *bat_priv, void *data, + uint8_t data_type, unsigned short vid) { struct hlist_head *head; struct batadv_dat_entry to_find, *dat_entry, *dat_entry_tmp = NULL; struct batadv_hashtable *hash = bat_priv->dat.hash; - uint32_t index; + uint32_t index, data_size = batadv_dat_types_info[data_type].size; if (!hash) return NULL; - to_find.ip = ip; + to_find.data = kmalloc(data_size, GFP_ATOMIC); + if (!to_find.data) + return NULL; + memcpy(to_find.data, data, data_size); + to_find.type = data_type; to_find.vid = vid; index = batadv_hash_dat(&to_find, hash->size); head = &hash->table[index]; + kfree(to_find.data); rcu_read_lock(); hlist_for_each_entry_rcu(dat_entry, head, hash_entry) { - if (dat_entry->ip != ip) + if (dat_entry->type != data_type) + continue; + if (memcmp(dat_entry->data, data, data_size)) continue; if (!atomic_inc_not_zero(&dat_entry->refcount)) @@ -265,25 +320,30 @@ batadv_dat_entry_hash_find(struct batadv_priv *bat_priv, __be32 ip, /** * batadv_dat_entry_add - add a new dat entry or update it if already exists * @bat_priv: the bat priv with all the soft interface information - * @ip: ipv4 to add/edit - * @mac_addr: mac address to assign to the given ipv4 + * @data: the data to add/edit + * @data_type: type of the data added to DAT + * @mac_addr: mac address to assign to the given data * @vid: VLAN identifier */ -static void batadv_dat_entry_add(struct batadv_priv *bat_priv, __be32 ip, - uint8_t *mac_addr, unsigned short vid) +static void batadv_dat_entry_add(struct batadv_priv *bat_priv, void *data, + uint8_t data_type, uint8_t *mac_addr, + unsigned short vid) { struct batadv_dat_entry *dat_entry; int hash_added; + char dbg_data[BATADV_DAT_DATA_MAX_LEN]; + size_t data_size = batadv_dat_types_info[data_type].size; - dat_entry = batadv_dat_entry_hash_find(bat_priv, ip, vid); + dat_entry = batadv_dat_entry_hash_find(bat_priv, data, data_type, vid); /* if this entry is already known, just update it */ if (dat_entry) { if (!batadv_compare_eth(dat_entry->mac_addr, mac_addr)) memcpy(dat_entry->mac_addr, mac_addr, ETH_ALEN); dat_entry->last_update = jiffies; - batadv_dbg(BATADV_DBG_DAT, bat_priv, - "Entry updated: %pI4 %pM (vid: %u)\n", - &dat_entry->ip, dat_entry->mac_addr, vid); + batadv_dbg(BATADV_DBG_DAT, bat_priv, "Entry updated: %s %pM (vid: %u)\n", + batadv_dat_data_to_str(dat_entry->data, data_type, + dbg_data, sizeof(dbg_data)), + dat_entry->mac_addr, vid); goto out; } @@ -291,7 +351,12 @@ static void batadv_dat_entry_add(struct batadv_priv *bat_priv, __be32 ip, if (!dat_entry) goto out; - dat_entry->ip = ip; + dat_entry->data = kmalloc(data_size, GFP_ATOMIC); + if (!dat_entry->data) + goto out; + memcpy(dat_entry->data, data, data_size); + + dat_entry->type = data_type; dat_entry->vid = vid; memcpy(dat_entry->mac_addr, mac_addr, ETH_ALEN); dat_entry->last_update = jiffies; @@ -307,8 +372,10 @@ static void batadv_dat_entry_add(struct batadv_priv *bat_priv, __be32 ip, goto out; } - batadv_dbg(BATADV_DBG_DAT, bat_priv, "New entry added: %pI4 %pM (vid: %u)\n", - &dat_entry->ip, dat_entry->mac_addr, vid); + batadv_dbg(BATADV_DBG_DAT, bat_priv, "New entry added: %s %pM (vid: %u)\n", + batadv_dat_data_to_str(dat_entry->data, data_type, + dbg_data, sizeof(dbg_data)), + dat_entry->mac_addr, vid); out: if (dat_entry) @@ -520,7 +587,8 @@ static void batadv_choose_next_candidate(struct batadv_priv *bat_priv, * batadv_dat_select_candidates - select the nodes which the DHT message has to * be sent to * @bat_priv: the bat priv with all the soft interface information - * @ip_dst: ipv4 to look up in the DHT + * @data: data to look up in the DHT + * @data_type: type of data * * An originator O is selected if and only if its DHT_ID value is one of three * closest values (from the LEFT, with wrap around if needed) then the hash @@ -529,11 +597,15 @@ static void batadv_choose_next_candidate(struct batadv_priv *bat_priv, * Returns the candidate array of size BATADV_DAT_CANDIDATE_NUM. */ static struct batadv_dat_candidate * -batadv_dat_select_candidates(struct batadv_priv *bat_priv, __be32 ip_dst) +batadv_dat_select_candidates(struct batadv_priv *bat_priv, void *data, + uint8_t data_type) { int select; - batadv_dat_addr_t last_max = BATADV_DAT_ADDR_MAX, ip_key; + batadv_dat_addr_t last_max = BATADV_DAT_ADDR_MAX, data_key; struct batadv_dat_candidate *res; + struct batadv_dat_entry to_find; + char dbg_data[BATADV_DAT_DATA_MAX_LEN]; + size_t data_size = batadv_dat_types_info[data_type].size; if (!bat_priv->orig_hash) return NULL; @@ -542,15 +614,23 @@ batadv_dat_select_candidates(struct batadv_priv *bat_priv, __be32 ip_dst) if (!res) return NULL; - ip_key = (batadv_dat_addr_t)batadv_hash_dat(&ip_dst, - BATADV_DAT_ADDR_MAX); + to_find.data = kmalloc(data_size, GFP_ATOMIC); + if (!to_find.data) + return NULL; + memcpy(to_find.data, data, data_size); + to_find.type = data_type; + data_key = (batadv_dat_addr_t)batadv_hash_dat(&to_find, + BATADV_DAT_ADDR_MAX); + kfree(to_find.data); batadv_dbg(BATADV_DBG_DAT, bat_priv, - "dat_select_candidates(): IP=%pI4 hash(IP)=%u\n", &ip_dst, - ip_key); + "dat_select_candidates(): DATA=%s hash(DATA)=%u\n", + batadv_dat_data_to_str(data, data_type, dbg_data, + sizeof(dbg_data)), + data_key); for (select = 0; select < BATADV_DAT_CANDIDATES_NUM; select++) - batadv_choose_next_candidate(bat_priv, res, select, ip_key, + batadv_choose_next_candidate(bat_priv, res, select, data_key, &last_max); return res; @@ -560,7 +640,8 @@ batadv_dat_select_candidates(struct batadv_priv *bat_priv, __be32 ip_dst) * batadv_dat_send_data - send a payload to the selected candidates * @bat_priv: the bat priv with all the soft interface information * @skb: payload to send - * @ip: the DHT key + * @data: the DHT key + * @data_type: type of data * @packet_subtype: unicast4addr packet subtype to use * * This function copies the skb with pskb_copy() and is sent as unicast packet @@ -570,8 +651,8 @@ batadv_dat_select_candidates(struct batadv_priv *bat_priv, __be32 ip_dst) * otherwise. */ static bool batadv_dat_send_data(struct batadv_priv *bat_priv, - struct sk_buff *skb, __be32 ip, - int packet_subtype) + struct sk_buff *skb, void *data, + uint8_t data_type, int packet_subtype) { int i; bool ret = false; @@ -579,12 +660,15 @@ static bool batadv_dat_send_data(struct batadv_priv *bat_priv, struct batadv_neigh_node *neigh_node = NULL; struct sk_buff *tmp_skb; struct batadv_dat_candidate *cand; + char dbg_data[BATADV_DAT_DATA_MAX_LEN]; - cand = batadv_dat_select_candidates(bat_priv, ip); + cand = batadv_dat_select_candidates(bat_priv, data, data_type); if (!cand) goto out; - batadv_dbg(BATADV_DBG_DAT, bat_priv, "DHT_SEND for %pI4\n", &ip); + batadv_dbg(BATADV_DBG_DAT, bat_priv, "DHT_SEND for %s\n", + batadv_dat_data_to_str(data, data_type, dbg_data, + sizeof(dbg_data))); for (i = 0; i < BATADV_DAT_CANDIDATES_NUM; i++) { if (cand[i].type == BATADV_DAT_CANDIDATE_NOT_FOUND) @@ -754,6 +838,7 @@ int batadv_dat_cache_seq_print_text(struct seq_file *seq, void *offset) unsigned long last_seen_jiffies; int last_seen_msecs, last_seen_secs, last_seen_mins; uint32_t i; + char dbg_data[BATADV_DAT_DATA_MAX_LEN]; primary_if = batadv_seq_print_text_primary_if_get(seq); if (!primary_if) @@ -774,8 +859,12 @@ int batadv_dat_cache_seq_print_text(struct seq_file *seq, void *offset) last_seen_msecs = last_seen_msecs % 60000; last_seen_secs = last_seen_msecs / 1000; - seq_printf(seq, " * %15pI4 %14pM %6i:%02i\n", - &dat_entry->ip, dat_entry->mac_addr, + seq_printf(seq, " * %15s %14pM %6i:%02i\n", + batadv_dat_data_to_str(dat_entry->data, + dat_entry->type, + dbg_data, + sizeof(dbg_data)), + dat_entry->mac_addr, last_seen_mins, last_seen_secs); } rcu_read_unlock(); @@ -926,9 +1015,10 @@ bool batadv_dat_snoop_outgoing_arp_request(struct batadv_priv *bat_priv, hw_src = batadv_arp_hw_src(skb, 0); ip_dst = batadv_arp_ip_dst(skb, 0); - batadv_dat_entry_add(bat_priv, ip_src, hw_src, vid); + batadv_dat_entry_add(bat_priv, &ip_src, BATADV_DAT_IPV4, hw_src, vid); - dat_entry = batadv_dat_entry_hash_find(bat_priv, ip_dst, vid); + dat_entry = batadv_dat_entry_hash_find(bat_priv, &ip_dst, + BATADV_DAT_IPV4, vid); if (dat_entry) { /* If the ARP request is destined for a local client the local * client will answer itself. DAT would only generate a @@ -962,7 +1052,8 @@ bool batadv_dat_snoop_outgoing_arp_request(struct batadv_priv *bat_priv, ret = true; } else { /* Send the request to the DHT */ - ret = batadv_dat_send_data(bat_priv, skb, ip_dst, + ret = batadv_dat_send_data(bat_priv, skb, &ip_dst, + BATADV_DAT_IPV4, BATADV_P_DAT_DHT_GET); } out: @@ -1008,9 +1099,10 @@ bool batadv_dat_snoop_incoming_arp_request(struct batadv_priv *bat_priv, batadv_dbg_arp(bat_priv, skb, type, hdr_size, "Parsing incoming ARP REQUEST"); - batadv_dat_entry_add(bat_priv, ip_src, hw_src, vid); + batadv_dat_entry_add(bat_priv, &ip_src, BATADV_DAT_IPV4, hw_src, vid); - dat_entry = batadv_dat_entry_hash_find(bat_priv, ip_dst, vid); + dat_entry = batadv_dat_entry_hash_find(bat_priv, &ip_dst, + BATADV_DAT_IPV4, vid); if (!dat_entry) goto out; @@ -1074,14 +1166,16 @@ void batadv_dat_snoop_outgoing_arp_reply(struct batadv_priv *bat_priv, hw_dst = batadv_arp_hw_dst(skb, hdr_size); ip_dst = batadv_arp_ip_dst(skb, hdr_size); - batadv_dat_entry_add(bat_priv, ip_src, hw_src, vid); - batadv_dat_entry_add(bat_priv, ip_dst, hw_dst, vid); + batadv_dat_entry_add(bat_priv, &ip_src, BATADV_DAT_IPV4, hw_src, vid); + batadv_dat_entry_add(bat_priv, &ip_dst, BATADV_DAT_IPV4, hw_dst, vid); /* Send the ARP reply to the candidates for both the IP addresses that * the node obtained from the ARP reply */ - batadv_dat_send_data(bat_priv, skb, ip_src, BATADV_P_DAT_DHT_PUT); - batadv_dat_send_data(bat_priv, skb, ip_dst, BATADV_P_DAT_DHT_PUT); + batadv_dat_send_data(bat_priv, skb, &ip_src, BATADV_DAT_IPV4, + BATADV_P_DAT_DHT_PUT); + batadv_dat_send_data(bat_priv, skb, &ip_dst, BATADV_DAT_IPV4, + BATADV_P_DAT_DHT_PUT); } /** * batadv_dat_snoop_incoming_arp_reply - snoop the ARP reply and fill the local @@ -1119,8 +1213,8 @@ bool batadv_dat_snoop_incoming_arp_reply(struct batadv_priv *bat_priv, /* Update our internal cache with both the IP addresses the node got * within the ARP reply */ - batadv_dat_entry_add(bat_priv, ip_src, hw_src, vid); - batadv_dat_entry_add(bat_priv, ip_dst, hw_dst, vid); + batadv_dat_entry_add(bat_priv, &ip_src, BATADV_DAT_IPV4, hw_src, vid); + batadv_dat_entry_add(bat_priv, &ip_dst, BATADV_DAT_IPV4, hw_dst, vid); /* if this REPLY is directed to a client of mine, let's deliver the * packet to the interface @@ -1167,7 +1261,8 @@ bool batadv_dat_drop_broadcast_packet(struct batadv_priv *bat_priv, goto out; ip_dst = batadv_arp_ip_dst(forw_packet->skb, hdr_size); - dat_entry = batadv_dat_entry_hash_find(bat_priv, ip_dst, vid); + dat_entry = batadv_dat_entry_hash_find(bat_priv, &ip_dst, + BATADV_DAT_IPV4, vid); /* check if the node already got this entry */ if (!dat_entry) { batadv_dbg(BATADV_DBG_DAT, bat_priv, diff --git a/distributed-arp-table.h b/distributed-arp-table.h index 60d853b..557bab9 100644 --- a/distributed-arp-table.h +++ b/distributed-arp-table.h @@ -28,6 +28,7 @@ #include <linux/if_arp.h> #define BATADV_DAT_ADDR_MAX ((batadv_dat_addr_t)~(batadv_dat_addr_t)0) +#define BATADV_DAT_DATA_MAX_LEN 16 void batadv_dat_status_update(struct net_device *net_dev); bool batadv_dat_snoop_outgoing_arp_request(struct batadv_priv *bat_priv, diff --git a/types.h b/types.h index 20a1bef..69c187e 100644 --- a/types.h +++ b/types.h @@ -931,7 +931,8 @@ struct batadv_algo_ops { /** * struct batadv_dat_entry - it is a single entry of batman-adv ARP backend. It * is used to stored ARP entries needed for the global DAT cache - * @ip: the IPv4 corresponding to this DAT/ARP entry + * @data: the data corresponding to this DAT entry + * @type: the type corresponding to this DAT entry * @mac_addr: the MAC address associated to the stored IPv4 * @vid: the vlan ID associated to this entry * @last_update: time in jiffies when this entry was refreshed last time @@ -940,7 +941,8 @@ struct batadv_algo_ops { * @rcu: struct used for freeing in an RCU-safe manner */ struct batadv_dat_entry { - __be32 ip; + void *data; + uint8_t type; uint8_t mac_addr[ETH_ALEN]; unsigned short vid; unsigned long last_update; @@ -950,6 +952,24 @@ struct batadv_dat_entry { }; /** + * batadv_dat_types - types used in batadv_dat_entry for IP + * @BATADV_DAT_IPv4: IPv4 address type + */ +enum batadv_dat_types { + BATADV_DAT_IPV4 = 0, +}; + +/** + * batadv_dat_type_info - info needed for a DAT type data + * @size: the size of the type data + * @str_fmt: string format used by the data + */ +struct batadv_dat_type_info { + size_t size; + char *str_fmt; +}; + +/** * struct batadv_dat_candidate - candidate destination for DAT operations * @type: the type of the selected candidate. It can one of the following: * - BATADV_DAT_CANDIDATE_NOT_FOUND -- 1.7.10.4

8 32

[B.A.T.M.A.N.] [PATCH] batman-adv: use static string for table headers
by Antonio Quartulli 11 Mar '16

11 Mar '16

Use a static string when showing table headers rather then a nonsense parametric one with fixed arguments. It is easier to grep and it does not need to be recomputed at runtime each time. Reported-by: Joe Perches <joe(a)perches.com> Signed-off-by: Antonio Quartulli <antonio(a)meshcoding.com> --- bat_iv_ogm.c | 5 ++--- bridge_loop_avoidance.c | 7 +++---- distributed-arp-table.c | 4 ++-- translation-table.c | 9 ++++----- 4 files changed, 11 insertions(+), 14 deletions(-) diff --git a/bat_iv_ogm.c b/bat_iv_ogm.c index 409cb16..553f8e4 100644 --- a/bat_iv_ogm.c +++ b/bat_iv_ogm.c @@ -1546,9 +1546,8 @@ static void batadv_iv_ogm_orig_print(struct batadv_priv *bat_priv, int batman_count = 0; uint32_t i; - seq_printf(seq, " %-15s %s (%s/%i) %17s [%10s]: %20s ...\n", - "Originator", "last-seen", "#", BATADV_TQ_MAX_VALUE, - "Nexthop", "outgoingIF", "Potential nexthops"); + seq_puts(seq, + " Originator last-seen (#/" __stringify(BATADV_TQ_MAX_VALUE) ") Nexthop [outgoingIF]: Potential nexthops ...\n"); for (i = 0; i < hash->size; i++) { head = &hash->table[i]; diff --git a/bridge_loop_avoidance.c b/bridge_loop_avoidance.c index 4382127..0c83809 100644 --- a/bridge_loop_avoidance.c +++ b/bridge_loop_avoidance.c @@ -1613,8 +1613,8 @@ int batadv_bla_claim_table_seq_print_text(struct seq_file *seq, void *offset) "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_printf(seq, " %-17s %-5s %-17s [o] (%-6s)\n", - "Client", "VID", "Originator", "CRC"); + seq_puts(seq, + " Client VID Originator [o] (CRC )\n"); for (i = 0; i < hash->size; i++) { head = &hash->table[i]; @@ -1658,8 +1658,7 @@ int batadv_bla_backbone_table_seq_print_text(struct seq_file *seq, void *offset) "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_printf(seq, " %-17s %-5s %-9s (%-6s)\n", - "Originator", "VID", "last seen", "CRC"); + seq_puts(seq, " Originator VID last seen (CRC )\n"); for (i = 0; i < hash->size; i++) { head = &hash->table[i]; diff --git a/distributed-arp-table.c b/distributed-arp-table.c index ed4b97a..4ba2d7d 100644 --- a/distributed-arp-table.c +++ b/distributed-arp-table.c @@ -756,8 +756,8 @@ int batadv_dat_cache_seq_print_text(struct seq_file *seq, void *offset) goto out; seq_printf(seq, "Distributed ARP Table (%s):\n", net_dev->name); - seq_printf(seq, " %-7s %-9s %4s %11s\n", "IPv4", - "MAC", "VID", "last-seen"); + seq_puts(seq, + " IPv4 MAC VID last-seen\n"); for (i = 0; i < hash->size; i++) { head = &hash->table[i]; diff --git a/translation-table.c b/translation-table.c index 5957bad..6abb240 100644 --- a/translation-table.c +++ b/translation-table.c @@ -869,8 +869,8 @@ int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset) seq_printf(seq, "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"); + seq_puts(seq, + " Client VID Flags Last seen (CRC )\n"); for (i = 0; i < hash->size; i++) { head = &hash->table[i]; @@ -1503,9 +1503,8 @@ int batadv_tt_global_seq_print_text(struct seq_file *seq, void *offset) seq_printf(seq, "Globally announced TT entries received via the mesh %s\n", net_dev->name); - seq_printf(seq, " %-13s %s %s %-15s %s (%-10s) %s\n", - "Client", "VID", "(TTVN)", "Originator", "(Curr TTVN)", - "CRC", "Flags"); + seq_puts(seq, + " Client VID (TTVN) Originator (Curr TTVN) (CRC ) Flags\n"); for (i = 0; i < hash->size; i++) { head = &hash->table[i]; -- 1.8.4.2

2 2

[B.A.T.M.A.N.] [PATCH] batman-adv: use batadv_compare_eth when possible
by Antonio Quartulli 10 Mar '16

10 Mar '16

When comparing Ethernet address it is better to use the more generic batadv_compare_eth. The latter is also optimised for architectures having a fast unaligned access. Signed-off-by: Antonio Quartulli <antonio(a)meshcoding.com> --- network-coding.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/network-coding.c b/network-coding.c index f1b604d..0049e7a 100644 --- a/network-coding.c +++ b/network-coding.c @@ -481,12 +481,10 @@ static int batadv_nc_hash_compare(const struct hlist_node *node, nc_path2 = data2; /* Return 1 if the two keys are identical */ - if (memcmp(nc_path1->prev_hop, nc_path2->prev_hop, - sizeof(nc_path1->prev_hop)) != 0) + if (!batadv_compare_eth(nc_path1->prev_hop, nc_path2->prev_hop)) return 0; - if (memcmp(nc_path1->next_hop, nc_path2->next_hop, - sizeof(nc_path1->next_hop)) != 0) + if (!batadv_compare_eth(nc_path1->next_hop, nc_path2->next_hop)) return 0; return 1; -- 1.8.5.2

2 2

[B.A.T.M.A.N.] [PATCH] batman-adv: fix debuginfo macro style issue
by Simon Wunderlich 10 Mar '16

10 Mar '16

From: Simon Wunderlich <simon(a)open-mesh.com> Structure initialization within the macros should follow the general coding style used in the kernel: put the initialization of the first variable and the closing brace on a separate line. Reported-by: Antonio Quartulli <antonio(a)meshcoding.com> Signed-off-by: Simon Wunderlich <simon(a)open-mesh.com> --- debugfs.c | 19 +++++++++++-------- 1 file changed, 11 insertions(+), 8 deletions(-) diff --git a/debugfs.c b/debugfs.c index cd5d24a..92d9d83 100644 --- a/debugfs.c +++ b/debugfs.c @@ -322,14 +322,17 @@ static int batadv_nc_nodes_open(struct inode *inode, struct file *file) #define BATADV_DEBUGINFO(_name, _mode, _open) \ struct batadv_debuginfo batadv_debuginfo_##_name = { \ - .attr = { .name = __stringify(_name), \ - .mode = _mode, }, \ - .fops = { .owner = THIS_MODULE, \ - .open = _open, \ - .read = seq_read, \ - .llseek = seq_lseek, \ - .release = single_release, \ - } \ + .attr = { \ + .name = __stringify(_name), \ + .mode = _mode, \ + }, \ + .fops = { \ + .owner = THIS_MODULE, \ + .open = _open, \ + .read = seq_read, \ + .llseek = seq_lseek, \ + .release = single_release, \ + }, \ }; /* the following attributes are general and therefore they will be directly -- 1.7.10.4

2 1

[B.A.T.M.A.N.] [PATCH next] batman-adv: fix DAT candidate selection (must use vid)
by Antonio Quartulli 10 Mar '16

10 Mar '16

Now that DAT is VLAN aware, it must use the VID when computing the DHT address of the candidate nodes where an entry is going to be stored/retrieved. Introduced by: 3e26722bc9f248ec4316749fc1957365c0fa5e4b ("batman-adv: make the Distributed ARP Table vlan aware") Signed-off-by: Antonio Quartulli <antonio(a)meshcoding.com> --- distributed-arp-table.c | 19 ++++++++++++------- 1 file changed, 12 insertions(+), 7 deletions(-) diff --git a/distributed-arp-table.c b/distributed-arp-table.c index 6c8c393..d4b3940 100644 --- a/distributed-arp-table.c +++ b/distributed-arp-table.c @@ -530,11 +530,13 @@ static void batadv_choose_next_candidate(struct batadv_priv *bat_priv, * Returns the candidate array of size BATADV_DAT_CANDIDATE_NUM. */ static struct batadv_dat_candidate * -batadv_dat_select_candidates(struct batadv_priv *bat_priv, __be32 ip_dst) +batadv_dat_select_candidates(struct batadv_priv *bat_priv, __be32 ip_dst, + unsigned short vid) { int select; batadv_dat_addr_t last_max = BATADV_DAT_ADDR_MAX, ip_key; struct batadv_dat_candidate *res; + struct batadv_dat_entry to_hash; if (!bat_priv->orig_hash) return NULL; @@ -543,7 +545,10 @@ batadv_dat_select_candidates(struct batadv_priv *bat_priv, __be32 ip_dst) if (!res) return NULL; - ip_key = (batadv_dat_addr_t)batadv_hash_dat(&ip_dst, + to_hash.ip = ip_dst; + to_hash.vid = vid; + + ip_key = (batadv_dat_addr_t)batadv_hash_dat(&to_hash, BATADV_DAT_ADDR_MAX); batadv_dbg(BATADV_DBG_DAT, bat_priv, @@ -572,7 +577,7 @@ batadv_dat_select_candidates(struct batadv_priv *bat_priv, __be32 ip_dst) */ static bool batadv_dat_send_data(struct batadv_priv *bat_priv, struct sk_buff *skb, __be32 ip, - int packet_subtype) + unsigned short vid, int packet_subtype) { int i; bool ret = false; @@ -581,7 +586,7 @@ static bool batadv_dat_send_data(struct batadv_priv *bat_priv, struct sk_buff *tmp_skb; struct batadv_dat_candidate *cand; - cand = batadv_dat_select_candidates(bat_priv, ip); + cand = batadv_dat_select_candidates(bat_priv, ip, vid); if (!cand) goto out; @@ -969,7 +974,7 @@ bool batadv_dat_snoop_outgoing_arp_request(struct batadv_priv *bat_priv, ret = true; } else { /* Send the request to the DHT */ - ret = batadv_dat_send_data(bat_priv, skb, ip_dst, + ret = batadv_dat_send_data(bat_priv, skb, ip_dst, vid, BATADV_P_DAT_DHT_GET); } out: @@ -1092,8 +1097,8 @@ void batadv_dat_snoop_outgoing_arp_reply(struct batadv_priv *bat_priv, /* Send the ARP reply to the candidates for both the IP addresses that * the node obtained from the ARP reply */ - batadv_dat_send_data(bat_priv, skb, ip_src, BATADV_P_DAT_DHT_PUT); - batadv_dat_send_data(bat_priv, skb, ip_dst, BATADV_P_DAT_DHT_PUT); + batadv_dat_send_data(bat_priv, skb, ip_src, vid, BATADV_P_DAT_DHT_PUT); + batadv_dat_send_data(bat_priv, skb, ip_dst, vid, BATADV_P_DAT_DHT_PUT); } /** * batadv_dat_snoop_incoming_arp_reply - snoop the ARP reply and fill the local -- 1.8.1.5

3 2

[B.A.T.M.A.N.] Classes and purposed classes (problem to solve)
by cmsv 16 Nov '15

16 Nov '15

Scenario: I have recently moved 13 nodes previously using wds to batman-adv. One problem that i am encountering is the gateway selection and its actually defectiveness. This problem has be seen when the client nodes are set on class 20. The node clients in fact select the gateways that advertise better link quality usually above 200 but at the same time some clients end up connecting to a gateway that is either too slow or unusable either due to routing or other factors such as distance and even clear visibility. In one case the node connects to something that defies logic. I thought about ways to work around this and came up with an idea that may help which means the creation of 2 new classes. - Preferred gateway fall-back - Preferred fixed gateway For Preferred gateway fall-back: consider the gateway's advertised quality towards the gateway and stick with the selection until the gateway disappears returning to it soon as it returns regardless of any other data. - Preferred fixed gateway Manual gateway selection by the node owner or admin. (wds type) If these classes cannot be created; maybe a plugin of some sort could be. could be called "gordon". I understand that this idea may sound useless the same way blocking originators may be for someone but in some scenarios just like blocking originators it look to me very valid. My current problem is that the link quality seems to go up and down like a roller coaster in a specific order which causes the clients to switch constantly sometimes many times per hour. While this does not seem to be an issue for most client nodes; for 2 of them it means no internet access at all. The solution for now seems to be having these 2 nodes forced to use 1 specific gateway. I am quite open to any ideas that may help resolve this issue that has been casing some "uninformed people" to become headaches. -- Redes wireless http://wirelesspt.net

3 2

[B.A.T.M.A.N.] TVLV infrastructure (v2)
by Marek Lindner 10 Jun '15

10 Jun '15

Hi, at the battlemesh we had plenty of time to discuss and test the tvlv patchset. Therefore, a number of changes/fixes found their way into v2 touching the tvlv API, network coding, unicast sending and gateway announcements. This looks like the final version which is going to be merged unless objections are raised soon-ish. Cheers, Marek

2 15

[B.A.T.M.A.N.] [PATCHv14 0/6] Basic Multicast Optimizations
by Linus Lüssing 10 Jun '15

10 Jun '15

This is the fourteenth revision of the basic multicast optimization patches. Changes in v14 include: * fixed compilation for CONFIG_BATMAN_ADV_MCAST=n (issue was introduced by v13) * fixed potential null pointer exception (moved ethhdr assignment in batadv_mcast_forw_mode() to after the check methods / pskb_may_pull()s) * removed flag-list-"helper" functions * removed methods which were performing both counting and orig_node retrieval in batadv_mcast_forw_mode(), instead doing that in two logical, seperate sections in batadv_mcast_forw_mode() Cheers, Linus

3 13

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B.A.T.M.A.N April 2014