From: Antonio Quartulli antonio@open-mesh.com

some of the struct batadv_orig_node members are B.A.T.M.A.N. IV specific and therefore they are moved in a algorithm specific substruct in order to make batadv_orig_node routing algorithm agnostic

Signed-off-by: Antonio Quartulli antonio@open-mesh.com Signed-off-by: Marek Lindner lindner_marek@yahoo.de --- net/batman-adv/bat_iv_ogm.c | 108 +++++++++++++++++++++++++++++++++----------- net/batman-adv/originator.c | 89 ++++++++++++++---------------------- net/batman-adv/originator.h | 3 +- net/batman-adv/types.h | 30 +++++++----- 4 files changed, 135 insertions(+), 95 deletions(-)

diff --git a/net/batman-adv/bat_iv_ogm.c b/net/batman-adv/bat_iv_ogm.c index a2a0498..0b1343d 100644 --- a/net/batman-adv/bat_iv_ogm.c +++ b/net/batman-adv/bat_iv_ogm.c @@ -87,6 +87,57 @@ static uint8_t batadv_ring_buffer_avg(const uint8_t lq_recv[]) return (uint8_t)(sum / count); }

+/** + * batadv_iv_ogm_orig_get - retrieve or create (if does not exist) an originator + * @bat_priv: the bat priv with all the soft interface information + * @addr: mac address of the originator + * + * Returns the originator object corresponding to the passed mac address or NULL + * on failure. + * If the object does not exists it is created an initialised. + */ +static struct batadv_orig_node * +batadv_iv_ogm_orig_get(struct batadv_priv *bat_priv, const uint8_t *addr) +{ + struct batadv_orig_node *orig_node; + int size, hash_added; + + orig_node = batadv_orig_hash_find(bat_priv, addr); + if (orig_node) + return orig_node; + + orig_node = batadv_orig_node_new(bat_priv, addr); + if (!orig_node) + return NULL; + + spin_lock_init(&orig_node->bat_iv.ogm_cnt_lock); + + size = bat_priv->num_ifaces * sizeof(unsigned long) * BATADV_NUM_WORDS; + orig_node->bat_iv.bcast_own = kzalloc(size, GFP_ATOMIC); + if (!orig_node->bat_iv.bcast_own) + goto free_orig_node; + + size = bat_priv->num_ifaces * sizeof(uint8_t); + orig_node->bat_iv.bcast_own_sum = kzalloc(size, GFP_ATOMIC); + if (!orig_node->bat_iv.bcast_own_sum) + goto free_bcast_own; + + hash_added = batadv_hash_add(bat_priv->orig_hash, batadv_compare_orig, + batadv_choose_orig, orig_node, + &orig_node->hash_entry); + if (hash_added != 0) + goto free_bcast_own; + + return orig_node; + +free_bcast_own: + kfree(orig_node->bat_iv.bcast_own); +free_orig_node: + batadv_orig_node_free_ref(orig_node); + + return NULL; +} + static struct batadv_neigh_node * batadv_iv_ogm_neigh_new(struct batadv_hard_iface *hard_iface, const uint8_t *neigh_addr, @@ -663,20 +714,22 @@ batadv_iv_ogm_slide_own_bcast_window(struct batadv_hard_iface *hard_iface) uint32_t i; size_t word_index; uint8_t *w; + int if_num;

for (i = 0; i < hash->size; i++) { head = &hash->table[i];

rcu_read_lock(); hlist_for_each_entry_rcu(orig_node, head, hash_entry) { - spin_lock_bh(&orig_node->ogm_cnt_lock); + spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock); word_index = hard_iface->if_num * BATADV_NUM_WORDS; - word = &(orig_node->bcast_own[word_index]); + word = &(orig_node->bat_iv.bcast_own[word_index]);

batadv_bit_get_packet(bat_priv, word, 1, 0); - w = &orig_node->bcast_own_sum[hard_iface->if_num]; + if_num = hard_iface->if_num; + w = &orig_node->bat_iv.bcast_own_sum[if_num]; *w = bitmap_weight(word, BATADV_TQ_LOCAL_WINDOW_SIZE); - spin_unlock_bh(&orig_node->ogm_cnt_lock); + spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock); } rcu_read_unlock(); } @@ -768,7 +821,7 @@ batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv, if (!neigh_node) { struct batadv_orig_node *orig_tmp;

- orig_tmp = batadv_get_orig_node(bat_priv, ethhdr->h_source); + orig_tmp = batadv_iv_ogm_orig_get(bat_priv, ethhdr->h_source); if (!orig_tmp) goto unlock;

@@ -818,16 +871,16 @@ batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv, */ if (router && (neigh_node->bat_iv.tq_avg == router->bat_iv.tq_avg)) { orig_node_tmp = router->orig_node; - spin_lock_bh(&orig_node_tmp->ogm_cnt_lock); + spin_lock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock); if_num = router->if_incoming->if_num; - sum_orig = orig_node_tmp->bcast_own_sum[if_num]; - spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock); + sum_orig = orig_node_tmp->bat_iv.bcast_own_sum[if_num]; + spin_unlock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);

orig_node_tmp = neigh_node->orig_node; - spin_lock_bh(&orig_node_tmp->ogm_cnt_lock); + spin_lock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock); if_num = neigh_node->if_incoming->if_num; - sum_neigh = orig_node_tmp->bcast_own_sum[if_num]; - spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock); + sum_neigh = orig_node_tmp->bat_iv.bcast_own_sum[if_num]; + spin_unlock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);

if (sum_orig >= sum_neigh) goto out; @@ -855,7 +908,7 @@ static int batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node, uint8_t total_count; uint8_t orig_eq_count, neigh_rq_count, neigh_rq_inv, tq_own; unsigned int neigh_rq_inv_cube, neigh_rq_max_cube; - int tq_asym_penalty, inv_asym_penalty, ret = 0; + int tq_asym_penalty, inv_asym_penalty, if_num, ret = 0; unsigned int combined_tq;

/* find corresponding one hop neighbor */ @@ -893,10 +946,11 @@ static int batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node, orig_node->last_seen = jiffies;

/* find packet count of corresponding one hop neighbor */ - spin_lock_bh(&orig_node->ogm_cnt_lock); - orig_eq_count = orig_neigh_node->bcast_own_sum[if_incoming->if_num]; + spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock); + if_num = if_incoming->if_num; + orig_eq_count = orig_neigh_node->bat_iv.bcast_own_sum[if_num]; neigh_rq_count = neigh_node->bat_iv.real_packet_count; - spin_unlock_bh(&orig_node->ogm_cnt_lock); + spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);

/* pay attention to not get a value bigger than 100 % */ if (orig_eq_count > neigh_rq_count) @@ -980,11 +1034,11 @@ batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr, uint8_t packet_count; unsigned long *bitmap;

- orig_node = batadv_get_orig_node(bat_priv, batadv_ogm_packet->orig); + orig_node = batadv_iv_ogm_orig_get(bat_priv, batadv_ogm_packet->orig); if (!orig_node) return BATADV_NO_DUP;

- spin_lock_bh(&orig_node->ogm_cnt_lock); + spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock); seq_diff = seqno - orig_node->last_real_seqno;

/* signalize caller that the packet is to be dropped. */ @@ -1033,7 +1087,7 @@ batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr, }

out: - spin_unlock_bh(&orig_node->ogm_cnt_lock); + spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock); batadv_orig_node_free_ref(orig_node); return ret; } @@ -1129,8 +1183,8 @@ static void batadv_iv_ogm_process(const struct ethhdr *ethhdr, int16_t if_num; uint8_t *weight;

- orig_neigh_node = batadv_get_orig_node(bat_priv, - ethhdr->h_source); + orig_neigh_node = batadv_iv_ogm_orig_get(bat_priv, + ethhdr->h_source); if (!orig_neigh_node) return;

@@ -1144,15 +1198,15 @@ static void batadv_iv_ogm_process(const struct ethhdr *ethhdr, if_num = if_incoming->if_num; offset = if_num * BATADV_NUM_WORDS;

- spin_lock_bh(&orig_neigh_node->ogm_cnt_lock); - word = &(orig_neigh_node->bcast_own[offset]); + spin_lock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock); + word = &(orig_neigh_node->bat_iv.bcast_own[offset]); bit_pos = if_incoming_seqno - 2; bit_pos -= ntohl(batadv_ogm_packet->seqno); batadv_set_bit(word, bit_pos); - weight = &orig_neigh_node->bcast_own_sum[if_num]; + weight = &orig_neigh_node->bat_iv.bcast_own_sum[if_num]; *weight = bitmap_weight(word, BATADV_TQ_LOCAL_WINDOW_SIZE); - spin_unlock_bh(&orig_neigh_node->ogm_cnt_lock); + spin_unlock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock); }

batadv_dbg(BATADV_DBG_BATMAN, bat_priv, @@ -1175,7 +1229,7 @@ static void batadv_iv_ogm_process(const struct ethhdr *ethhdr, return; }

- orig_node = batadv_get_orig_node(bat_priv, batadv_ogm_packet->orig); + orig_node = batadv_iv_ogm_orig_get(bat_priv, batadv_ogm_packet->orig); if (!orig_node) return;

@@ -1225,8 +1279,8 @@ static void batadv_iv_ogm_process(const struct ethhdr *ethhdr, if (is_single_hop_neigh) orig_neigh_node = orig_node; else - orig_neigh_node = batadv_get_orig_node(bat_priv, - ethhdr->h_source); + orig_neigh_node = batadv_iv_ogm_orig_get(bat_priv, + ethhdr->h_source);

if (!orig_neigh_node) goto out; diff --git a/net/batman-adv/originator.c b/net/batman-adv/originator.c index 50f6d99..aa14094 100644 --- a/net/batman-adv/originator.c +++ b/net/batman-adv/originator.c @@ -36,7 +36,7 @@ static struct lock_class_key batadv_orig_hash_lock_class_key; static void batadv_purge_orig(struct work_struct *work);

/* returns 1 if they are the same originator */ -static int batadv_compare_orig(const struct hlist_node *node, const void *data2) +int batadv_compare_orig(const struct hlist_node *node, const void *data2) { const void *data1 = container_of(node, struct batadv_orig_node, hash_entry); @@ -242,8 +242,8 @@ static void batadv_orig_node_free_rcu(struct rcu_head *rcu) "originator timed out");

kfree(orig_node->tt_buff); - kfree(orig_node->bcast_own); - kfree(orig_node->bcast_own_sum); + kfree(orig_node->bat_iv.bcast_own); + kfree(orig_node->bat_iv.bcast_own_sum); kfree(orig_node); }

@@ -301,21 +301,22 @@ void batadv_originator_free(struct batadv_priv *bat_priv) batadv_hash_destroy(hash); }

-/* this function finds or creates an originator entry for the given - * address if it does not exits +/** + * batadv_orig_node_new - creates a new orig_node + * @bat_priv: the bat priv with all the soft interface information + * @addr: the mac address of the originator + * + * Creates a new originator object and initialise all the generic fields. + * The new object is not added to the originator list. + * Returns the newly created object or NULL on failure. */ -struct batadv_orig_node *batadv_get_orig_node(struct batadv_priv *bat_priv, +struct batadv_orig_node *batadv_orig_node_new(struct batadv_priv *bat_priv, const uint8_t *addr) { struct batadv_orig_node *orig_node; struct batadv_orig_node_vlan *vlan; - int size, i; - int hash_added; unsigned long reset_time; - - orig_node = batadv_orig_hash_find(bat_priv, addr); - if (orig_node) - return orig_node; + int i;

batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "Creating new originator: %pM\n", addr); @@ -327,7 +328,6 @@ struct batadv_orig_node *batadv_get_orig_node(struct batadv_priv *bat_priv, INIT_HLIST_HEAD(&orig_node->neigh_list); INIT_LIST_HEAD(&orig_node->bond_list); INIT_LIST_HEAD(&orig_node->vlan_list); - spin_lock_init(&orig_node->ogm_cnt_lock); spin_lock_init(&orig_node->bcast_seqno_lock); spin_lock_init(&orig_node->neigh_list_lock); spin_lock_init(&orig_node->tt_buff_lock); @@ -363,37 +363,13 @@ struct batadv_orig_node *batadv_get_orig_node(struct batadv_priv *bat_priv, */ batadv_orig_node_vlan_free_ref(vlan);

- size = bat_priv->num_ifaces * sizeof(unsigned long) * BATADV_NUM_WORDS; - - orig_node->bcast_own = kzalloc(size, GFP_ATOMIC); - if (!orig_node->bcast_own) - goto free_vlan; - - size = bat_priv->num_ifaces * sizeof(uint8_t); - orig_node->bcast_own_sum = kzalloc(size, GFP_ATOMIC); - for (i = 0; i < BATADV_FRAG_BUFFER_COUNT; i++) { INIT_HLIST_HEAD(&orig_node->fragments[i].head); spin_lock_init(&orig_node->fragments[i].lock); orig_node->fragments[i].size = 0; }

- if (!orig_node->bcast_own_sum) - goto free_bcast_own; - - hash_added = batadv_hash_add(bat_priv->orig_hash, batadv_compare_orig, - batadv_choose_orig, orig_node, - &orig_node->hash_entry); - if (hash_added != 0) - goto free_bcast_own_sum; - return orig_node; -free_bcast_own_sum: - kfree(orig_node->bcast_own_sum); -free_bcast_own: - kfree(orig_node->bcast_own); -free_vlan: - batadv_orig_node_vlan_free_ref(vlan); free_orig_node: kfree(orig_node); return NULL; @@ -619,18 +595,18 @@ static int batadv_orig_node_add_if(struct batadv_orig_node *orig_node, if (!data_ptr) return -ENOMEM;

- memcpy(data_ptr, orig_node->bcast_own, old_size); - kfree(orig_node->bcast_own); - orig_node->bcast_own = data_ptr; + memcpy(data_ptr, orig_node->bat_iv.bcast_own, old_size); + kfree(orig_node->bat_iv.bcast_own); + orig_node->bat_iv.bcast_own = data_ptr;

data_ptr = kmalloc(max_if_num * sizeof(uint8_t), GFP_ATOMIC); if (!data_ptr) return -ENOMEM;

- memcpy(data_ptr, orig_node->bcast_own_sum, + memcpy(data_ptr, orig_node->bat_iv.bcast_own_sum, (max_if_num - 1) * sizeof(uint8_t)); - kfree(orig_node->bcast_own_sum); - orig_node->bcast_own_sum = data_ptr; + kfree(orig_node->bat_iv.bcast_own_sum); + orig_node->bat_iv.bcast_own_sum = data_ptr;

return 0; } @@ -653,9 +629,9 @@ int batadv_orig_hash_add_if(struct batadv_hard_iface *hard_iface,

rcu_read_lock(); hlist_for_each_entry_rcu(orig_node, head, hash_entry) { - spin_lock_bh(&orig_node->ogm_cnt_lock); + spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock); ret = batadv_orig_node_add_if(orig_node, max_if_num); - spin_unlock_bh(&orig_node->ogm_cnt_lock); + spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);

if (ret == -ENOMEM) goto err; @@ -673,8 +649,8 @@ err: static int batadv_orig_node_del_if(struct batadv_orig_node *orig_node, int max_if_num, int del_if_num) { + int chunk_size, if_offset; void *data_ptr = NULL; - int chunk_size;

/* last interface was removed */ if (max_if_num == 0) @@ -686,16 +662,16 @@ static int batadv_orig_node_del_if(struct batadv_orig_node *orig_node, return -ENOMEM;

/* copy first part */ - memcpy(data_ptr, orig_node->bcast_own, del_if_num * chunk_size); + memcpy(data_ptr, orig_node->bat_iv.bcast_own, del_if_num * chunk_size);

/* copy second part */ memcpy((char *)data_ptr + del_if_num * chunk_size, - orig_node->bcast_own + ((del_if_num + 1) * chunk_size), + orig_node->bat_iv.bcast_own + ((del_if_num + 1) * chunk_size), (max_if_num - del_if_num) * chunk_size);

free_bcast_own: - kfree(orig_node->bcast_own); - orig_node->bcast_own = data_ptr; + kfree(orig_node->bat_iv.bcast_own); + orig_node->bat_iv.bcast_own = data_ptr;

if (max_if_num == 0) goto free_own_sum; @@ -704,16 +680,17 @@ free_bcast_own: if (!data_ptr) return -ENOMEM;

- memcpy(data_ptr, orig_node->bcast_own_sum, + memcpy(data_ptr, orig_node->bat_iv.bcast_own_sum, del_if_num * sizeof(uint8_t));

+ if_offset = (del_if_num + 1) * sizeof(uint8_t); memcpy((char *)data_ptr + del_if_num * sizeof(uint8_t), - orig_node->bcast_own_sum + ((del_if_num + 1) * sizeof(uint8_t)), + orig_node->bat_iv.bcast_own_sum + if_offset, (max_if_num - del_if_num) * sizeof(uint8_t));

free_own_sum: - kfree(orig_node->bcast_own_sum); - orig_node->bcast_own_sum = data_ptr; + kfree(orig_node->bat_iv.bcast_own_sum); + orig_node->bat_iv.bcast_own_sum = data_ptr;

return 0; } @@ -737,10 +714,10 @@ int batadv_orig_hash_del_if(struct batadv_hard_iface *hard_iface,

rcu_read_lock(); hlist_for_each_entry_rcu(orig_node, head, hash_entry) { - spin_lock_bh(&orig_node->ogm_cnt_lock); + spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock); ret = batadv_orig_node_del_if(orig_node, max_if_num, hard_iface->if_num); - spin_unlock_bh(&orig_node->ogm_cnt_lock); + spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);

if (ret == -ENOMEM) goto err; diff --git a/net/batman-adv/originator.h b/net/batman-adv/originator.h index 06e5a68..6f77d80 100644 --- a/net/batman-adv/originator.h +++ b/net/batman-adv/originator.h @@ -22,12 +22,13 @@

#include "hash.h"

+int batadv_compare_orig(const struct hlist_node *node, const void *data2); int batadv_originator_init(struct batadv_priv *bat_priv); void batadv_originator_free(struct batadv_priv *bat_priv); void batadv_purge_orig_ref(struct batadv_priv *bat_priv); void batadv_orig_node_free_ref(struct batadv_orig_node *orig_node); void batadv_orig_node_free_ref_now(struct batadv_orig_node *orig_node); -struct batadv_orig_node *batadv_get_orig_node(struct batadv_priv *bat_priv, +struct batadv_orig_node *batadv_orig_node_new(struct batadv_priv *bat_priv, const uint8_t *addr); struct batadv_neigh_node * batadv_neigh_node_new(struct batadv_hard_iface *hard_iface, diff --git a/net/batman-adv/types.h b/net/batman-adv/types.h index a321334..97bde51 100644 --- a/net/batman-adv/types.h +++ b/net/batman-adv/types.h @@ -133,14 +133,28 @@ struct batadv_orig_node_vlan { };

/** + * struct batadv_orig_bat_iv - B.A.T.M.A.N. IV private orig_node members + * @bcast_own: bitfield containing the number of our OGMs this orig_node + * rebroadcasted "back" to us (relative to last_real_seqno) + * @bcast_own_sum: counted result of bcast_own + * @ogm_cnt_lock: lock protecting bcast_own, bcast_own_sum, + * neigh_node->bat_iv.real_bits & neigh_node->bat_iv.real_packet_count + */ +struct batadv_orig_bat_iv { + unsigned long *bcast_own; + uint8_t *bcast_own_sum; + /* ogm_cnt_lock protects: bcast_own, bcast_own_sum, + * neigh_node->bat_iv.real_bits & neigh_node->bat_iv.real_packet_count + */ + spinlock_t ogm_cnt_lock; +}; + +/** * struct batadv_orig_node - structure for orig_list maintaining nodes of mesh * @orig: originator ethernet address * @primary_addr: hosts primary interface address * @router: router that should be used to reach this originator * @batadv_dat_addr_t: address of the orig node in the distributed hash - * @bcast_own: bitfield containing the number of our OGMs this orig_node - * rebroadcasted "back" to us (relative to last_real_seqno) - * @bcast_own_sum: counted result of bcast_own * @last_seen: time when last packet from this node was received * @bcast_seqno_reset: time when the broadcast seqno window was reset * @batman_seqno_reset: time when the batman seqno window was reset @@ -166,8 +180,6 @@ struct batadv_orig_node_vlan { * @neigh_list_lock: lock protecting neigh_list, router and bonding_list * @hash_entry: hlist node for batadv_priv::orig_hash * @bat_priv: pointer to soft_iface this orig node belongs to - * @ogm_cnt_lock: lock protecting bcast_own, bcast_own_sum, - * neigh_node->real_bits & neigh_node->real_packet_count * @bcast_seqno_lock: lock protecting bcast_bits & last_bcast_seqno * @bond_candidates: how many candidates are available * @bond_list: list of bonding candidates @@ -181,6 +193,7 @@ struct batadv_orig_node_vlan { * @vlan_list: a list of orig_node_vlan structs, one per VLAN served by the * originator represented by this object * @vlan_list_lock: lock protecting vlan_list + * @bat_iv: B.A.T.M.A.N. IV private structure */ struct batadv_orig_node { uint8_t orig[ETH_ALEN]; @@ -189,8 +202,6 @@ struct batadv_orig_node { #ifdef CONFIG_BATMAN_ADV_DAT batadv_dat_addr_t dat_addr; #endif - unsigned long *bcast_own; - uint8_t *bcast_own_sum; unsigned long last_seen; unsigned long bcast_seqno_reset; unsigned long batman_seqno_reset; @@ -211,10 +222,6 @@ struct batadv_orig_node { spinlock_t neigh_list_lock; struct hlist_node hash_entry; struct batadv_priv *bat_priv; - /* ogm_cnt_lock protects: bcast_own, bcast_own_sum, - * neigh_node->real_bits & neigh_node->real_packet_count - */ - spinlock_t ogm_cnt_lock; /* bcast_seqno_lock protects: bcast_bits & last_bcast_seqno */ spinlock_t bcast_seqno_lock; atomic_t bond_candidates; @@ -230,6 +237,7 @@ struct batadv_orig_node { struct batadv_frag_table_entry fragments[BATADV_FRAG_BUFFER_COUNT]; struct list_head vlan_list; spinlock_t vlan_list_lock; /* protects vlan_list */ + struct batadv_orig_bat_iv bat_iv; };

/**

From: Antonio Quartulli antonio@open-mesh.com

This new API allows to compare the two neighbours based on the metric avoiding the user to deal with any routing algorithm specific detail

Signed-off-by: Antonio Quartulli antonio@open-mesh.com Signed-off-by: Marek Lindner lindner_marek@yahoo.de --- net/batman-adv/bat_iv_ogm.c | 20 ++++++++++++++++++++ net/batman-adv/main.c | 3 ++- net/batman-adv/types.h | 3 +++ 3 files changed, 25 insertions(+), 1 deletion(-)

diff --git a/net/batman-adv/bat_iv_ogm.c b/net/batman-adv/bat_iv_ogm.c index 4aabd55..b288d90 100644 --- a/net/batman-adv/bat_iv_ogm.c +++ b/net/batman-adv/bat_iv_ogm.c @@ -1475,6 +1475,25 @@ next: seq_puts(seq, "No batman nodes in range ...\n"); }

+/** + * batadv_iv_ogm_neigh_cmp - compare the metrics of two neighbors + * @neigh1: the first neighbor object of the comparison + * @neigh2: the second neighbor object of the comparison + * + * Returns a value less, equal to or greater than 0 if the metric via neigh1 is + * lower, the same as or higher than the metric via neigh2 + */ +static int batadv_iv_ogm_neigh_cmp(struct batadv_neigh_node *neigh1, + struct batadv_neigh_node *neigh2) +{ + uint8_t tq1, tq2; + + tq1 = neigh1->bat_iv.tq_avg; + tq2 = neigh2->bat_iv.tq_avg; + + return tq1 - tq2; +} + static struct batadv_algo_ops batadv_batman_iv __read_mostly = { .name = "BATMAN_IV", .bat_iface_enable = batadv_iv_ogm_iface_enable, @@ -1483,6 +1502,7 @@ static struct batadv_algo_ops batadv_batman_iv __read_mostly = { .bat_primary_iface_set = batadv_iv_ogm_primary_iface_set, .bat_ogm_schedule = batadv_iv_ogm_schedule, .bat_ogm_emit = batadv_iv_ogm_emit, + .bat_neigh_cmp = batadv_iv_ogm_neigh_cmp, .bat_orig_print = batadv_iv_ogm_orig_print, };

diff --git a/net/batman-adv/main.c b/net/batman-adv/main.c index 3159a14..1f2f1ac 100644 --- a/net/batman-adv/main.c +++ b/net/batman-adv/main.c @@ -501,7 +501,8 @@ int batadv_algo_register(struct batadv_algo_ops *bat_algo_ops) !bat_algo_ops->bat_iface_update_mac || !bat_algo_ops->bat_primary_iface_set || !bat_algo_ops->bat_ogm_schedule || - !bat_algo_ops->bat_ogm_emit) { + !bat_algo_ops->bat_ogm_emit || + !bat_algo_ops->bat_neigh_cmp) { pr_info("Routing algo '%s' does not implement required ops\n", bat_algo_ops->name); ret = -EINVAL; diff --git a/net/batman-adv/types.h b/net/batman-adv/types.h index 72fd617..7a00932 100644 --- a/net/batman-adv/types.h +++ b/net/batman-adv/types.h @@ -992,6 +992,7 @@ struct batadv_forw_packet { * @bat_primary_iface_set: called when primary interface is selected / changed * @bat_ogm_schedule: prepare a new outgoing OGM for the send queue * @bat_ogm_emit: send scheduled OGM + * @bat_neigh_cmp: compare the metrics of two neighbors * @bat_orig_print: print the originator table (optional) */ struct batadv_algo_ops { @@ -1003,6 +1004,8 @@ struct batadv_algo_ops { void (*bat_primary_iface_set)(struct batadv_hard_iface *hard_iface); void (*bat_ogm_schedule)(struct batadv_hard_iface *hard_iface); void (*bat_ogm_emit)(struct batadv_forw_packet *forw_packet); + int (*bat_neigh_cmp)(struct batadv_neigh_node *neigh1, + struct batadv_neigh_node *neigh2); /* orig_node handling API */ void (*bat_orig_print)(struct batadv_priv *priv, struct seq_file *seq); };

From: Antonio Quartulli antonio@open-mesh.com

Signed-off-by: Antonio Quartulli antonio@open-mesh.com Signed-off-by: Marek Lindner lindner_marek@yahoo.de --- net/batman-adv/bat_iv_ogm.c | 2 +- net/batman-adv/routing.c | 42 +++++++++++++++++++++++++++++------------- net/batman-adv/routing.h | 3 ++- 3 files changed, 32 insertions(+), 15 deletions(-)

diff --git a/net/batman-adv/bat_iv_ogm.c b/net/batman-adv/bat_iv_ogm.c index 4376fe7..7cdc394 100644 --- a/net/batman-adv/bat_iv_ogm.c +++ b/net/batman-adv/bat_iv_ogm.c @@ -853,7 +853,7 @@ batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv, neigh_node->last_ttl = batadv_ogm_packet->header.ttl; }

- batadv_bonding_candidate_add(orig_node, neigh_node); + batadv_bonding_candidate_add(bat_priv, orig_node, neigh_node);

/* if this neighbor already is our next hop there is nothing * to change diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c index 5b78a71..71fba14 100644 --- a/net/batman-adv/routing.c +++ b/net/batman-adv/routing.c @@ -115,11 +115,21 @@ out: return; }

-void batadv_bonding_candidate_add(struct batadv_orig_node *orig_node, +/** + * batadv_bonding_candidate_add - consider a new link for bonding mode towards + * the given originator + * @bat_priv: the bat priv with all the soft interface information + * @orig_node: the target node + * @neigh_node: the neighbor representing the new link to consider for bonding + * mode + */ +void batadv_bonding_candidate_add(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig_node, struct batadv_neigh_node *neigh_node) { + struct batadv_algo_ops *bao = bat_priv->bat_algo_ops; struct batadv_neigh_node *tmp_neigh_node, *router = NULL; - uint8_t interference_candidate = 0, tq; + uint8_t interference_candidate = 0;

spin_lock_bh(&orig_node->neigh_list_lock);

@@ -134,8 +144,7 @@ void batadv_bonding_candidate_add(struct batadv_orig_node *orig_node,

/* ... and is good enough to be considered */ - tq = router->bat_iv.tq_avg - BATADV_BONDING_TQ_THRESHOLD; - if (neigh_node->bat_iv.tq_avg < tq) + if (bao->bat_neigh_is_equiv_or_better(neigh_node, router)) goto candidate_del;

/* check if we have another candidate with the same mac address or @@ -481,18 +490,25 @@ out: return router; }

-/* Interface Alternating: Use the best of the - * remaining candidates which are not using - * this interface. +/** + * batadv_find_ifalter_router - find the best of the remaining candidates which + * are not using this interface + * @bat_priv: the bat priv with all the soft interface information + * @primary_orig: the destination + * @recv_if: the interface that the router returned by this function has to not + * use * - * Increases the returned router's refcount + * Returns the best candidate towards primary_orig that is not using recv_if. + * Increases the returned neighbor's refcount */ static struct batadv_neigh_node * -batadv_find_ifalter_router(struct batadv_orig_node *primary_orig, +batadv_find_ifalter_router(struct batadv_priv *bat_priv, + struct batadv_orig_node *primary_orig, const struct batadv_hard_iface *recv_if) { - struct batadv_neigh_node *tmp_neigh_node; struct batadv_neigh_node *router = NULL, *first_candidate = NULL; + struct batadv_algo_ops *bao = bat_priv->bat_algo_ops; + struct batadv_neigh_node *tmp_neigh_node;

rcu_read_lock(); list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list, @@ -504,8 +520,7 @@ batadv_find_ifalter_router(struct batadv_orig_node *primary_orig, if (tmp_neigh_node->if_incoming == recv_if) continue;

- if (router && - tmp_neigh_node->bat_iv.tq_avg <= router->bat_iv.tq_avg) + if (router && bao->bat_neigh_cmp(tmp_neigh_node, router)) continue;

if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) @@ -639,7 +654,8 @@ batadv_find_router(struct batadv_priv *bat_priv, if (bonding_enabled) router = batadv_find_bond_router(primary_orig_node, recv_if); else - router = batadv_find_ifalter_router(primary_orig_node, recv_if); + router = batadv_find_ifalter_router(bat_priv, primary_orig_node, + recv_if);

return_router: if (router && router->if_incoming->if_status != BATADV_IF_ACTIVE) diff --git a/net/batman-adv/routing.h b/net/batman-adv/routing.h index 55d637a..19544dd 100644 --- a/net/batman-adv/routing.h +++ b/net/batman-adv/routing.h @@ -48,7 +48,8 @@ batadv_find_router(struct batadv_priv *bat_priv, const struct batadv_hard_iface *recv_if); void batadv_bonding_candidate_del(struct batadv_orig_node *orig_node, struct batadv_neigh_node *neigh_node); -void batadv_bonding_candidate_add(struct batadv_orig_node *orig_node, +void batadv_bonding_candidate_add(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig_node, struct batadv_neigh_node *neigh_node); void batadv_bonding_save_primary(const struct batadv_orig_node *orig_node, struct batadv_orig_node *orig_neigh_node,

From: Antonio Quartulli antonio@open-mesh.com

Some operations executed on an orig_node depends on the current routing algorithm being used. To easily make this mechanism routing algorithm agnostic add a orig_node specific API that each algorithm can populate with its own routines.

Such routines are then invoked by the code when needed, without knowing which routing algorithm is currently in use

With this patch 3 API functions are added: - orig_free (to free routing depending internal structs) - orig_add_if (to change the inner state of an orig_node when a new hard interface is added) - orig_del_if (to change the inner state of an orig_node when an hard interface is removed)

Signed-off-by: Antonio Quartulli antonio@open-mesh.com Signed-off-by: Marek Lindner lindner_marek@yahoo.de --- net/batman-adv/bat_iv_ogm.c | 126 ++++++++++++++++++++++++++++++++++++++++++++ net/batman-adv/originator.c | 102 +++++------------------------------ net/batman-adv/types.h | 11 ++++ 3 files changed, 151 insertions(+), 88 deletions(-)

diff --git a/net/batman-adv/bat_iv_ogm.c b/net/batman-adv/bat_iv_ogm.c index 7cdc394..a2b480a 100644 --- a/net/batman-adv/bat_iv_ogm.c +++ b/net/batman-adv/bat_iv_ogm.c @@ -88,6 +88,129 @@ static uint8_t batadv_ring_buffer_avg(const uint8_t lq_recv[]) }

/** + * batadv_iv_ogm_orig_free - free the private resources allocated for this + * orig_node + * @orig_node: the orig_node for which the resources have to be free'd + */ +static void batadv_iv_ogm_orig_free(struct batadv_orig_node *orig_node) +{ + kfree(orig_node->bat_iv.bcast_own); + kfree(orig_node->bat_iv.bcast_own_sum); +} + +/** + * batadv_iv_ogm_orig_add_if - change the private structures of the orig_node to + * include the new hard-interface + * @orig_node: the orig_node that has to be changed + * @max_if_num: the current amount of interfaces + * + * Returns 0 on success, a negative error code otherwise. + */ +static int batadv_iv_ogm_orig_add_if(struct batadv_orig_node *orig_node, + int max_if_num) +{ + void *data_ptr; + size_t data_size, old_size; + int ret = -ENOMEM; + + spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock); + + data_size = max_if_num * sizeof(unsigned long) * BATADV_NUM_WORDS; + old_size = (max_if_num - 1) * sizeof(unsigned long) * BATADV_NUM_WORDS; + data_ptr = kmalloc(data_size, GFP_ATOMIC); + if (!data_ptr) + goto unlock; + + memcpy(data_ptr, orig_node->bat_iv.bcast_own, old_size); + kfree(orig_node->bat_iv.bcast_own); + orig_node->bat_iv.bcast_own = data_ptr; + + data_ptr = kmalloc(max_if_num * sizeof(uint8_t), GFP_ATOMIC); + if (!data_ptr) { + kfree(orig_node->bat_iv.bcast_own); + goto unlock; + } + + memcpy(data_ptr, orig_node->bat_iv.bcast_own_sum, + (max_if_num - 1) * sizeof(uint8_t)); + kfree(orig_node->bat_iv.bcast_own_sum); + orig_node->bat_iv.bcast_own_sum = data_ptr; + + ret = 0; + +unlock: + spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock); + + return ret; +} + +/** + * batadv_iv_ogm_orig_del_if - change the private structures of the orig_node to + * exclude the removed interface + * @orig_node: the orig_node that has to be changed + * @max_if_num: the current amount of interfaces + * @del_if_num: the index of the interface being removed + * + * Returns 0 on success, a negative error code otherwise. + */ +static int batadv_iv_ogm_orig_del_if(struct batadv_orig_node *orig_node, + int max_if_num, int del_if_num) +{ + int chunk_size, ret = -ENOMEM, if_offset; + void *data_ptr = NULL; + + spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock); + + /* last interface was removed */ + if (max_if_num == 0) + goto free_bcast_own; + + chunk_size = sizeof(unsigned long) * BATADV_NUM_WORDS; + data_ptr = kmalloc(max_if_num * chunk_size, GFP_ATOMIC); + if (!data_ptr) + goto unlock; + + /* copy first part */ + memcpy(data_ptr, orig_node->bat_iv.bcast_own, del_if_num * chunk_size); + + /* copy second part */ + memcpy((char *)data_ptr + del_if_num * chunk_size, + orig_node->bat_iv.bcast_own + ((del_if_num + 1) * chunk_size), + (max_if_num - del_if_num) * chunk_size); + +free_bcast_own: + kfree(orig_node->bat_iv.bcast_own); + orig_node->bat_iv.bcast_own = data_ptr; + + if (max_if_num == 0) + goto free_own_sum; + + data_ptr = kmalloc(max_if_num * sizeof(uint8_t), GFP_ATOMIC); + if (!data_ptr) { + kfree(orig_node->bat_iv.bcast_own); + goto unlock; + } + + memcpy(data_ptr, orig_node->bat_iv.bcast_own_sum, + del_if_num * sizeof(uint8_t)); + + if_offset = (del_if_num + 1) * sizeof(uint8_t); + memcpy((char *)data_ptr + del_if_num * sizeof(uint8_t), + orig_node->bat_iv.bcast_own_sum + if_offset, + (max_if_num - del_if_num) * sizeof(uint8_t)); + +free_own_sum: + kfree(orig_node->bat_iv.bcast_own_sum); + orig_node->bat_iv.bcast_own_sum = data_ptr; + + ret = 0; +unlock: + spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock); + + return ret; +} + +/** * batadv_iv_ogm_orig_get - retrieve or create (if does not exist) an originator * @bat_priv: the bat priv with all the soft interface information * @addr: mac address of the originator @@ -1522,6 +1645,9 @@ static struct batadv_algo_ops batadv_batman_iv __read_mostly = { .bat_neigh_cmp = batadv_iv_ogm_neigh_cmp, .bat_neigh_is_equiv_or_better = batadv_iv_ogm_neigh_is_eob, .bat_orig_print = batadv_iv_ogm_orig_print, + .bat_orig_free = batadv_iv_ogm_orig_free, + .bat_orig_add_if = batadv_iv_ogm_orig_add_if, + .bat_orig_del_if = batadv_iv_ogm_orig_del_if, };

int __init batadv_iv_init(void) diff --git a/net/batman-adv/originator.c b/net/batman-adv/originator.c index 9cee053..8ab1434 100644 --- a/net/batman-adv/originator.c +++ b/net/batman-adv/originator.c @@ -241,9 +241,10 @@ static void batadv_orig_node_free_rcu(struct rcu_head *rcu) batadv_tt_global_del_orig(orig_node->bat_priv, orig_node, -1, "originator timed out");

+ if (orig_node->bat_priv->bat_algo_ops->bat_orig_free) + orig_node->bat_priv->bat_algo_ops->bat_orig_free(orig_node); + kfree(orig_node->tt_buff); - kfree(orig_node->bat_iv.bcast_own); - kfree(orig_node->bat_iv.bcast_own_sum); kfree(orig_node); }

@@ -538,38 +539,11 @@ int batadv_orig_seq_print_text(struct seq_file *seq, void *offset) return 0; }

-static int batadv_orig_node_add_if(struct batadv_orig_node *orig_node, - int max_if_num) -{ - void *data_ptr; - size_t data_size, old_size; - - data_size = max_if_num * sizeof(unsigned long) * BATADV_NUM_WORDS; - old_size = (max_if_num - 1) * sizeof(unsigned long) * BATADV_NUM_WORDS; - data_ptr = kmalloc(data_size, GFP_ATOMIC); - if (!data_ptr) - return -ENOMEM; - - memcpy(data_ptr, orig_node->bat_iv.bcast_own, old_size); - kfree(orig_node->bat_iv.bcast_own); - orig_node->bat_iv.bcast_own = data_ptr; - - data_ptr = kmalloc(max_if_num * sizeof(uint8_t), GFP_ATOMIC); - if (!data_ptr) - return -ENOMEM; - - memcpy(data_ptr, orig_node->bat_iv.bcast_own_sum, - (max_if_num - 1) * sizeof(uint8_t)); - kfree(orig_node->bat_iv.bcast_own_sum); - orig_node->bat_iv.bcast_own_sum = data_ptr; - - return 0; -} - int batadv_orig_hash_add_if(struct batadv_hard_iface *hard_iface, int max_if_num) { struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); + struct batadv_algo_ops *bao = bat_priv->bat_algo_ops; struct batadv_hashtable *hash = bat_priv->orig_hash; struct hlist_head *head; struct batadv_orig_node *orig_node; @@ -584,10 +558,10 @@ int batadv_orig_hash_add_if(struct batadv_hard_iface *hard_iface,

rcu_read_lock(); hlist_for_each_entry_rcu(orig_node, head, hash_entry) { - spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock); - ret = batadv_orig_node_add_if(orig_node, max_if_num); - spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock); - + ret = 0; + if (bao->bat_orig_add_if) + ret = bao->bat_orig_add_if(orig_node, + max_if_num); if (ret == -ENOMEM) goto err; } @@ -601,55 +575,6 @@ err: return -ENOMEM; }

-static int batadv_orig_node_del_if(struct batadv_orig_node *orig_node, - int max_if_num, int del_if_num) -{ - int chunk_size, if_offset; - void *data_ptr = NULL; - - /* last interface was removed */ - if (max_if_num == 0) - goto free_bcast_own; - - chunk_size = sizeof(unsigned long) * BATADV_NUM_WORDS; - data_ptr = kmalloc(max_if_num * chunk_size, GFP_ATOMIC); - if (!data_ptr) - return -ENOMEM; - - /* copy first part */ - memcpy(data_ptr, orig_node->bat_iv.bcast_own, del_if_num * chunk_size); - - /* copy second part */ - memcpy((char *)data_ptr + del_if_num * chunk_size, - orig_node->bat_iv.bcast_own + ((del_if_num + 1) * chunk_size), - (max_if_num - del_if_num) * chunk_size); - -free_bcast_own: - kfree(orig_node->bat_iv.bcast_own); - orig_node->bat_iv.bcast_own = data_ptr; - - if (max_if_num == 0) - goto free_own_sum; - - data_ptr = kmalloc(max_if_num * sizeof(uint8_t), GFP_ATOMIC); - if (!data_ptr) - return -ENOMEM; - - memcpy(data_ptr, orig_node->bat_iv.bcast_own_sum, - del_if_num * sizeof(uint8_t)); - - if_offset = (del_if_num + 1) * sizeof(uint8_t); - memcpy((char *)data_ptr + del_if_num * sizeof(uint8_t), - orig_node->bat_iv.bcast_own_sum + if_offset, - (max_if_num - del_if_num) * sizeof(uint8_t)); - -free_own_sum: - kfree(orig_node->bat_iv.bcast_own_sum); - orig_node->bat_iv.bcast_own_sum = data_ptr; - - return 0; -} - int batadv_orig_hash_del_if(struct batadv_hard_iface *hard_iface, int max_if_num) { @@ -658,6 +583,7 @@ int batadv_orig_hash_del_if(struct batadv_hard_iface *hard_iface, struct hlist_head *head; struct batadv_hard_iface *hard_iface_tmp; struct batadv_orig_node *orig_node; + struct batadv_algo_ops *bao = bat_priv->bat_algo_ops; uint32_t i; int ret;

@@ -669,11 +595,11 @@ int batadv_orig_hash_del_if(struct batadv_hard_iface *hard_iface,

rcu_read_lock(); hlist_for_each_entry_rcu(orig_node, head, hash_entry) { - spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock); - ret = batadv_orig_node_del_if(orig_node, max_if_num, - hard_iface->if_num); - spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock); - + ret = 0; + if (bao->bat_orig_del_if) + ret = bao->bat_orig_del_if(orig_node, + max_if_num, + hard_iface->if_num); if (ret == -ENOMEM) goto err; } diff --git a/net/batman-adv/types.h b/net/batman-adv/types.h index d0e64d2..672a813 100644 --- a/net/batman-adv/types.h +++ b/net/batman-adv/types.h @@ -996,6 +996,12 @@ struct batadv_forw_packet { * @bat_neigh_is_equiv_or_better: check if neigh1 is equally good or * better than neigh2 from the metric prospective * @bat_orig_print: print the originator table (optional) + * @bat_orig_free: free the resources allocated by the routing algorithm for an + * orig_node object + * @bat_orig_add_if: ask the routing algorithm to apply the needed changes to + * the orig_node due to a new hard-interface being added into the mesh + * @bat_orig_del_if: ask the routing algorithm to apply the needed changes to + * the orig_node due to an hard-interface being removed from the mesh */ struct batadv_algo_ops { struct hlist_node list; @@ -1012,6 +1018,11 @@ struct batadv_algo_ops { struct batadv_neigh_node *neigh2); /* orig_node handling API */ void (*bat_orig_print)(struct batadv_priv *priv, struct seq_file *seq); + void (*bat_orig_free)(struct batadv_orig_node *orig_node); + int (*bat_orig_add_if)(struct batadv_orig_node *orig_node, + int max_if_num); + int (*bat_orig_del_if)(struct batadv_orig_node *orig_node, + int max_if_num, int del_if_num); };

/**

From: Marek Lindner lindner_marek@yahoo.de

The local translation table size is limited by what can be transferred from one node to another via a full table request.

The number of entries fitting into a full table request depend on whether the fragmentation is enabled or not. Therefore this patch introduces a max table size check and refuses to add more local clients when that size is reached. Moreover, if the max full table packet size changes (MTU change or fragmentation is disabled) the local table is downsized instantaneously.

Signed-off-by: Marek Lindner lindner_marek@yahoo.de Acked-by: Antonio Quartulli ordex@autistici.org --- net/batman-adv/hard-interface.c | 41 ++++++---- net/batman-adv/soft-interface.c | 12 ++- net/batman-adv/translation-table.c | 150 +++++++++++++++++++++++++++++++++---- net/batman-adv/translation-table.h | 3 +- net/batman-adv/types.h | 3 + 5 files changed, 173 insertions(+), 36 deletions(-)

diff --git a/net/batman-adv/hard-interface.c b/net/batman-adv/hard-interface.c index c5f871f..c60d3ed 100644 --- a/net/batman-adv/hard-interface.c +++ b/net/batman-adv/hard-interface.c @@ -266,16 +266,9 @@ static void batadv_check_known_mac_addr(const struct net_device *net_dev)

int batadv_hardif_min_mtu(struct net_device *soft_iface) { - const struct batadv_priv *bat_priv = netdev_priv(soft_iface); + struct batadv_priv *bat_priv = netdev_priv(soft_iface); const struct batadv_hard_iface *hard_iface; - /* allow big frames if all devices are capable to do so - * (have MTU > 1500 + batadv_max_header_len()) - */ int min_mtu = ETH_DATA_LEN; - int max_header_len = batadv_max_header_len(); - - if (atomic_read(&bat_priv->fragmentation)) - goto out;

rcu_read_lock(); list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { @@ -286,22 +279,40 @@ int batadv_hardif_min_mtu(struct net_device *soft_iface) if (hard_iface->soft_iface != soft_iface) continue;

- min_mtu = min_t(int, hard_iface->net_dev->mtu - max_header_len, - min_mtu); + min_mtu = min_t(int, hard_iface->net_dev->mtu, min_mtu); } rcu_read_unlock(); + + atomic_set(&bat_priv->packet_size_max, min_mtu); + + if (atomic_read(&bat_priv->fragmentation) == 0) + goto out; + + /* with fragmentation enabled the maximum size of internally generated + * packets such as translation table exchanges or tvlv containers, etc + * has to be calculated + */ + min_mtu = min_t(int, min_mtu, BATADV_FRAG_MAX_FRAG_SIZE); + min_mtu -= sizeof(struct batadv_frag_packet); + min_mtu *= BATADV_FRAG_MAX_FRAGMENTS; + atomic_set(&bat_priv->packet_size_max, min_mtu); + + /* with fragmentation enabled we can fragment external packets easily */ + min_mtu = min_t(int, min_mtu, ETH_DATA_LEN); + out: - return min_mtu; + return min_mtu - batadv_max_header_len(); }

/* adjusts the MTU if a new interface with a smaller MTU appeared. */ void batadv_update_min_mtu(struct net_device *soft_iface) { - int min_mtu; + soft_iface->mtu = batadv_hardif_min_mtu(soft_iface);

- min_mtu = batadv_hardif_min_mtu(soft_iface); - if (soft_iface->mtu != min_mtu) - soft_iface->mtu = min_mtu; + /* Check if the local translate table should be cleaned up to match a + * new (and smaller) MTU. + */ + batadv_tt_local_resize_to_mtu(soft_iface); }

static void diff --git a/net/batman-adv/soft-interface.c b/net/batman-adv/soft-interface.c index e70f530..36f0508 100644 --- a/net/batman-adv/soft-interface.c +++ b/net/batman-adv/soft-interface.c @@ -166,7 +166,7 @@ static int batadv_interface_tx(struct sk_buff *skb, unsigned int header_len = 0; int data_len = skb->len, ret; unsigned long brd_delay = 1; - bool do_bcast = false; + bool do_bcast = false, client_added; unsigned short vid; uint32_t seqno;

@@ -196,9 +196,12 @@ static int batadv_interface_tx(struct sk_buff *skb, ethhdr = (struct ethhdr *)skb->data;

/* Register the client MAC in the transtable */ - if (!is_multicast_ether_addr(ethhdr->h_source)) - batadv_tt_local_add(soft_iface, ethhdr->h_source, vid, - skb->skb_iif); + if (!is_multicast_ether_addr(ethhdr->h_source)) { + client_added = batadv_tt_local_add(soft_iface, ethhdr->h_source, + vid, skb->skb_iif); + if (!client_added) + goto dropped; + }

/* don't accept stp packets. STP does not help in meshes. * better use the bridge loop avoidance ... @@ -674,6 +677,7 @@ static int batadv_softif_init_late(struct net_device *dev) atomic_set(&bat_priv->log_level, 0); #endif atomic_set(&bat_priv->fragmentation, 1); + atomic_set(&bat_priv->packet_size_max, ETH_DATA_LEN); atomic_set(&bat_priv->bcast_queue_left, BATADV_BCAST_QUEUE_LEN); atomic_set(&bat_priv->batman_queue_left, BATADV_BATMAN_QUEUE_LEN);

diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c index 4c28251..a3c965d 100644 --- a/net/batman-adv/translation-table.c +++ b/net/batman-adv/translation-table.c @@ -401,6 +401,35 @@ 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) @@ -439,8 +468,10 @@ 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); @@ -448,8 +479,8 @@ void batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr, struct batadv_tt_global_entry *tt_global; 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;

tt_local = batadv_tt_local_hash_find(bat_priv, addr, vid); tt_global = batadv_tt_global_hash_find(bat_priv, addr, vid); @@ -484,6 +515,17 @@ 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; @@ -550,11 +592,14 @@ check_roaming: } }

+ ret = true; + out: if (tt_local) batadv_tt_local_entry_free_ref(tt_local); if (tt_global) batadv_tt_global_entry_free_ref(tt_global); + return ret; }

/** @@ -926,8 +971,16 @@ 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; @@ -945,8 +998,7 @@ 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, @@ -954,7 +1006,14 @@ 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; @@ -966,7 +1025,7 @@ 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); } } @@ -2383,6 +2442,15 @@ static bool batadv_send_other_tt_response(struct batadv_priv *bat_priv, 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; tvlv_tt_data->ttvn = req_ttvn;

@@ -2859,7 +2927,7 @@ 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); @@ -2972,18 +3040,18 @@ 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) { - spin_lock_bh(&bat_priv->tt.commit_lock); - 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); - goto out; + return; }

batadv_tt_local_set_flags(bat_priv, BATADV_TT_CLIENT_NEW, false, true); @@ -3000,8 +3068,17 @@ void batadv_tt_local_commit_changes(struct batadv_priv *bat_priv) /* reset the sending counter */ atomic_set(&bat_priv->tt.ogm_append_cnt, BATADV_TT_OGM_APPEND_MAX); batadv_tt_tvlv_container_update(bat_priv); +}

-out: +/** + * 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); }

@@ -3197,6 +3274,47 @@ out: }

/** + * 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 * @orig: the orig_node of the ogm diff --git a/net/batman-adv/translation-table.h b/net/batman-adv/translation-table.h index dc6db4e..026b1ff 100644 --- a/net/batman-adv/translation-table.h +++ b/net/batman-adv/translation-table.h @@ -21,7 +21,7 @@ #define _NET_BATMAN_ADV_TRANSLATION_TABLE_H_

int batadv_tt_init(struct batadv_priv *bat_priv); -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); uint16_t batadv_tt_local_remove(struct batadv_priv *bat_priv, const uint8_t *addr, unsigned short vid, @@ -45,6 +45,7 @@ bool batadv_tt_global_client_is_roaming(struct batadv_priv *bat_priv, uint8_t *addr, unsigned short vid); bool batadv_tt_local_client_is_roaming(struct batadv_priv *bat_priv, uint8_t *addr, unsigned short vid); +void batadv_tt_local_resize_to_mtu(struct net_device *soft_iface); bool batadv_tt_add_temporary_global_entry(struct batadv_priv *bat_priv, struct batadv_orig_node *orig_node, const unsigned char *addr, diff --git a/net/batman-adv/types.h b/net/batman-adv/types.h index 672a813..04b6b0b 100644 --- a/net/batman-adv/types.h +++ b/net/batman-adv/types.h @@ -612,6 +612,8 @@ struct batadv_softif_vlan { * @aggregated_ogms: bool indicating whether OGM aggregation is enabled * @bonding: bool indicating whether traffic bonding is enabled * @fragmentation: bool indicating whether traffic fragmentation is enabled + * @packet_size_max: max packet size that can be transmitted via + * multiple fragmented skbs or a single frame if fragmentation is disabled * @frag_seqno: incremental counter to identify chains of egress fragments * @bridge_loop_avoidance: bool indicating whether bridge loop avoidance is * enabled @@ -658,6 +660,7 @@ struct batadv_priv { atomic_t aggregated_ogms; atomic_t bonding; atomic_t fragmentation; + atomic_t packet_size_max; atomic_t frag_seqno; #ifdef CONFIG_BATMAN_ADV_BLA atomic_t bridge_loop_avoidance;

From: Antonio Quartulli antonio@open-mesh.com

Upcoming changes need to perform other checks on the incoming net_device struct.

To avoid performing dev_get_by_index() for each and every check, it is better to move it outside of is_wifi_iface() and search the netdev object once only.

Signed-off-by: Antonio Quartulli antonio@open-mesh.com Signed-off-by: Marek Lindner mareklindner@neomailbox.ch --- net/batman-adv/hard-interface.c | 33 ++++----------------------------- net/batman-adv/hard-interface.h | 2 +- net/batman-adv/translation-table.c | 8 +++++++- 3 files changed, 12 insertions(+), 31 deletions(-)

diff --git a/net/batman-adv/hard-interface.c b/net/batman-adv/hard-interface.c index 1ba8a55..57c2a19 100644 --- a/net/batman-adv/hard-interface.c +++ b/net/batman-adv/hard-interface.c @@ -125,8 +125,11 @@ static int batadv_is_valid_iface(const struct net_device *net_dev) * * Returns true if the net device is a 802.11 wireless device, false otherwise. */ -static bool batadv_is_wifi_netdev(struct net_device *net_device) +bool batadv_is_wifi_netdev(struct net_device *net_device) { + if (!net_device) + return false; + #ifdef CONFIG_WIRELESS_EXT /* pre-cfg80211 drivers have to implement WEXT, so it is possible to * check for wireless_handlers != NULL @@ -142,34 +145,6 @@ static bool batadv_is_wifi_netdev(struct net_device *net_device) return false; }

-/** - * batadv_is_wifi_iface - check if the given interface represented by ifindex - * is a wifi interface - * @ifindex: interface index to check - * - * Returns true if the interface represented by ifindex is a 802.11 wireless - * device, false otherwise. - */ -bool batadv_is_wifi_iface(int ifindex) -{ - struct net_device *net_device = NULL; - bool ret = false; - - if (ifindex == BATADV_NULL_IFINDEX) - goto out; - - net_device = dev_get_by_index(&init_net, ifindex); - if (!net_device) - goto out; - - ret = batadv_is_wifi_netdev(net_device); - -out: - if (net_device) - dev_put(net_device); - return ret; -} - static struct batadv_hard_iface * batadv_hardif_get_active(const struct net_device *soft_iface) { diff --git a/net/batman-adv/hard-interface.h b/net/batman-adv/hard-interface.h index 4989288..df4c8bd 100644 --- a/net/batman-adv/hard-interface.h +++ b/net/batman-adv/hard-interface.h @@ -41,6 +41,7 @@ enum batadv_hard_if_cleanup {

extern struct notifier_block batadv_hard_if_notifier;

+bool batadv_is_wifi_netdev(struct net_device *net_device); struct batadv_hard_iface* batadv_hardif_get_by_netdev(const struct net_device *net_dev); int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface, @@ -51,7 +52,6 @@ void batadv_hardif_remove_interfaces(void); int batadv_hardif_min_mtu(struct net_device *soft_iface); void batadv_update_min_mtu(struct net_device *soft_iface); void batadv_hardif_free_rcu(struct rcu_head *rcu); -bool batadv_is_wifi_iface(int ifindex);

static inline void batadv_hardif_free_ref(struct batadv_hard_iface *hard_iface) diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c index a3c965d..b0fe177 100644 --- a/net/batman-adv/translation-table.c +++ b/net/batman-adv/translation-table.c @@ -477,11 +477,15 @@ bool batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr, 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, table_size, packet_size_max; bool ret = false, roamed_back = false;

+ 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);

@@ -542,7 +546,7 @@ bool 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; @@ -595,6 +599,8 @@ check_roaming: ret = true;

out: + if (in_dev) + dev_put(in_dev); if (tt_local) batadv_tt_local_entry_free_ref(tt_local); if (tt_global)

From: Antonio Quartulli antonio@open-mesh.com

Flags covered by TT_SYNC_MASK are kept in sync among the nodes in the network and therefore they have to be considered while computing the global/local table CRC.

In this way a generic originator is able to understand if its table contains the correct flags or not.

Bits from 4 to 7 in the TT flags fields are now reserved for "synchronized" flags only.

This allows future developers to add more flags of this type without breaking compatibility.

It's important to note that not all the remote TT flags are synchronised. This comes from the fact that some flags are used to inject an information once only.

Signed-off-by: Antonio Quartulli antonio@open-mesh.com Signed-off-by: Marek Lindner mareklindner@neomailbox.ch --- net/batman-adv/packet.h | 5 +++-- net/batman-adv/translation-table.c | 19 +++++++++++++++++++ net/batman-adv/types.h | 6 ++++++ 3 files changed, 28 insertions(+), 2 deletions(-)

diff --git a/net/batman-adv/packet.h b/net/batman-adv/packet.h index 9fbcaac..843b96a 100644 --- a/net/batman-adv/packet.h +++ b/net/batman-adv/packet.h @@ -110,12 +110,13 @@ enum batadv_tt_data_flags {

/* BATADV_TT_CLIENT flags. * Flags from BIT(0) to BIT(7) are sent on the wire, while flags from BIT(8) to - * BIT(15) are used for local computation only + * BIT(15) are used for local computation only. + * Flags from BIT(4) to BIT(7) are kept in sync with the rest of the network. */ enum batadv_tt_client_flags { BATADV_TT_CLIENT_DEL = BIT(0), BATADV_TT_CLIENT_ROAM = BIT(1), - BATADV_TT_CLIENT_WIFI = BIT(2), + BATADV_TT_CLIENT_WIFI = BIT(4), BATADV_TT_CLIENT_NOPURGE = BIT(8), BATADV_TT_CLIENT_NEW = BIT(9), BATADV_TT_CLIENT_PENDING = BIT(10), diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c index 267780f..4add57d 100644 --- a/net/batman-adv/translation-table.c +++ b/net/batman-adv/translation-table.c @@ -1959,6 +1959,7 @@ static uint32_t batadv_tt_global_crc(struct batadv_priv *bat_priv, 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]; @@ -1997,6 +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(); @@ -2022,6 +2030,7 @@ static uint32_t batadv_tt_local_crc(struct batadv_priv *bat_priv, 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]; @@ -2042,6 +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(); @@ -3524,6 +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; diff --git a/net/batman-adv/types.h b/net/batman-adv/types.h index 61297b6..3c21162 100644 --- a/net/batman-adv/types.h +++ b/net/batman-adv/types.h @@ -42,6 +42,12 @@ #define BATADV_TT_REMOTE_MASK 0x00FF

/** + * BATADV_TT_SYNC_MASK - bitmask of the flags that need to be kept in sync + * among the nodes. These flags are used to compute the global/local CRC + */ +#define BATADV_TT_SYNC_MASK 0x00F0 + +/** * struct batadv_hard_iface_bat_iv - per hard interface B.A.T.M.A.N. IV data * @ogm_buff: buffer holding the OGM packet * @ogm_buff_len: length of the OGM packet buffer

From: Simon Wunderlich sw@simonwunderlich.de

Instead of handling icmp packets only up to length of icmp_packet_rr, the code should handle any icmp length size. Therefore the length truncating is moved to when the packet is actually sent to userspace (this does not support lengths longer than icmp_packet_rr yet). Longer packets are forwarded without truncating.

This patch also cleans up some parts where the icmp header struct could be used instead of other icmp_packet(_rr) structs to make the code more readable.

Signed-off-by: Simon Wunderlich sw@simonwunderlich.de Signed-off-by: Marek Lindner mareklindner@neomailbox.ch Signed-off-by: Antonio Quartulli antonio@meshcoding.com --- net/batman-adv/icmp_socket.c | 128 +++++++++++++++++++++++++++---------------- net/batman-adv/icmp_socket.h | 2 +- net/batman-adv/packet.h | 2 + net/batman-adv/routing.c | 120 ++++++++++++++++++++++++---------------- net/batman-adv/types.h | 2 +- 5 files changed, 157 insertions(+), 97 deletions(-)

diff --git a/net/batman-adv/icmp_socket.c b/net/batman-adv/icmp_socket.c index 82ac647..29ae4ef 100644 --- a/net/batman-adv/icmp_socket.c +++ b/net/batman-adv/icmp_socket.c @@ -29,7 +29,7 @@ static struct batadv_socket_client *batadv_socket_client_hash[256];

static void batadv_socket_add_packet(struct batadv_socket_client *socket_client, - struct batadv_icmp_packet_rr *icmp_packet, + struct batadv_icmp_header *icmph, size_t icmp_len);

void batadv_socket_init(void) @@ -155,13 +155,13 @@ static ssize_t batadv_socket_write(struct file *file, const char __user *buff, struct batadv_priv *bat_priv = socket_client->bat_priv; struct batadv_hard_iface *primary_if = NULL; struct sk_buff *skb; - struct batadv_icmp_packet_rr *icmp_packet; - + struct batadv_icmp_packet_rr *icmp_packet_rr; + struct batadv_icmp_header *icmp_header; struct batadv_orig_node *orig_node = NULL; struct batadv_neigh_node *neigh_node = NULL; size_t packet_len = sizeof(struct batadv_icmp_packet);

- if (len < sizeof(struct batadv_icmp_packet)) { + if (len < sizeof(struct batadv_icmp_header)) { batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "Error - can't send packet from char device: invalid packet size\n"); return -EINVAL; @@ -174,8 +174,10 @@ static ssize_t batadv_socket_write(struct file *file, const char __user *buff, goto out; }

- if (len >= sizeof(struct batadv_icmp_packet_rr)) - packet_len = sizeof(struct batadv_icmp_packet_rr); + if (len >= BATADV_ICMP_MAX_PACKET_SIZE) + packet_len = BATADV_ICMP_MAX_PACKET_SIZE; + else + packet_len = len;

skb = netdev_alloc_skb_ip_align(NULL, packet_len + ETH_HLEN); if (!skb) { @@ -185,67 +187,78 @@ static ssize_t batadv_socket_write(struct file *file, const char __user *buff,

skb->priority = TC_PRIO_CONTROL; skb_reserve(skb, ETH_HLEN); - icmp_packet = (struct batadv_icmp_packet_rr *)skb_put(skb, packet_len); + icmp_header = (struct batadv_icmp_header *)skb_put(skb, packet_len);

- if (copy_from_user(icmp_packet, buff, packet_len)) { + if (copy_from_user(icmp_header, buff, packet_len)) { len = -EFAULT; goto free_skb; }

- if (icmp_packet->icmph.header.packet_type != BATADV_ICMP) { + if (icmp_header->header.packet_type != BATADV_ICMP) { batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "Error - can't send packet from char device: got bogus packet type (expected: BAT_ICMP)\n"); len = -EINVAL; goto free_skb; }

- if (icmp_packet->icmph.msg_type != BATADV_ECHO_REQUEST) { + switch (icmp_header->msg_type) { + case BATADV_ECHO_REQUEST: + if (len < sizeof(struct batadv_icmp_packet)) { + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "Error - can't send packet from char device: invalid packet size\n"); + len = -EINVAL; + goto free_skb; + } + + if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) + goto dst_unreach; + + orig_node = batadv_orig_hash_find(bat_priv, icmp_header->dst); + if (!orig_node) + goto dst_unreach; + + neigh_node = batadv_orig_node_get_router(orig_node); + if (!neigh_node) + goto dst_unreach; + + if (!neigh_node->if_incoming) + goto dst_unreach; + + if (neigh_node->if_incoming->if_status != BATADV_IF_ACTIVE) + goto dst_unreach; + + icmp_packet_rr = (struct batadv_icmp_packet_rr *)icmp_header; + if (packet_len == sizeof(*icmp_packet_rr)) + memcpy(icmp_packet_rr->rr, + neigh_node->if_incoming->net_dev->dev_addr, + ETH_ALEN); + + break; + default: batadv_dbg(BATADV_DBG_BATMAN, bat_priv, - "Error - can't send packet from char device: got bogus message type (expected: ECHO_REQUEST)\n"); + "Error - can't send packet from char device: got unknown message type\n"); len = -EINVAL; goto free_skb; }

- icmp_packet->icmph.uid = socket_client->index; + icmp_header->uid = socket_client->index;

- if (icmp_packet->icmph.header.version != BATADV_COMPAT_VERSION) { - icmp_packet->icmph.msg_type = BATADV_PARAMETER_PROBLEM; - icmp_packet->icmph.header.version = BATADV_COMPAT_VERSION; - batadv_socket_add_packet(socket_client, icmp_packet, + if (icmp_header->header.version != BATADV_COMPAT_VERSION) { + icmp_header->msg_type = BATADV_PARAMETER_PROBLEM; + icmp_header->header.version = BATADV_COMPAT_VERSION; + batadv_socket_add_packet(socket_client, icmp_header, packet_len); goto free_skb; }

- if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) - goto dst_unreach; - - orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->icmph.dst); - if (!orig_node) - goto dst_unreach; - - neigh_node = batadv_orig_node_get_router(orig_node); - if (!neigh_node) - goto dst_unreach; - - if (!neigh_node->if_incoming) - goto dst_unreach; - - if (neigh_node->if_incoming->if_status != BATADV_IF_ACTIVE) - goto dst_unreach; - - memcpy(icmp_packet->icmph.orig, - primary_if->net_dev->dev_addr, ETH_ALEN); - - if (packet_len == sizeof(struct batadv_icmp_packet_rr)) - memcpy(icmp_packet->rr, - neigh_node->if_incoming->net_dev->dev_addr, ETH_ALEN); + memcpy(icmp_header->orig, primary_if->net_dev->dev_addr, ETH_ALEN);

batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); goto out;

dst_unreach: - icmp_packet->icmph.msg_type = BATADV_DESTINATION_UNREACHABLE; - batadv_socket_add_packet(socket_client, icmp_packet, packet_len); + icmp_header->msg_type = BATADV_DESTINATION_UNREACHABLE; + batadv_socket_add_packet(socket_client, icmp_header, packet_len); free_skb: kfree_skb(skb); out: @@ -298,27 +311,40 @@ err: return -ENOMEM; }

+/** + * batadv_socket_receive_packet - schedule an icmp packet to be sent to userspace + * on an icmp socket. + * @socket_client: the socket this packet belongs to + * @icmph: pointer to the header of the icmp packet + * @icmp_len: total length of the icmp packet + */ static void batadv_socket_add_packet(struct batadv_socket_client *socket_client, - struct batadv_icmp_packet_rr *icmp_packet, + struct batadv_icmp_header *icmph, size_t icmp_len) { struct batadv_socket_packet *socket_packet; + size_t len;

socket_packet = kmalloc(sizeof(*socket_packet), GFP_ATOMIC);

if (!socket_packet) return;

+ len = icmp_len; + /* check the maximum length before filling the buffer */ + if (len > sizeof(socket_packet->icmp_packet)) + len = sizeof(socket_packet->icmp_packet); + INIT_LIST_HEAD(&socket_packet->list); - memcpy(&socket_packet->icmp_packet, icmp_packet, icmp_len); - socket_packet->icmp_len = icmp_len; + memcpy(&socket_packet->icmp_packet, icmph, len); + socket_packet->icmp_len = len;

spin_lock_bh(&socket_client->lock);

/* while waiting for the lock the socket_client could have been * deleted */ - if (!batadv_socket_client_hash[icmp_packet->icmph.uid]) { + if (!batadv_socket_client_hash[icmph->uid]) { spin_unlock_bh(&socket_client->lock); kfree(socket_packet); return; @@ -342,12 +368,18 @@ static void batadv_socket_add_packet(struct batadv_socket_client *socket_client, wake_up(&socket_client->queue_wait); }

-void batadv_socket_receive_packet(struct batadv_icmp_packet_rr *icmp_packet, +/** + * batadv_socket_receive_packet - schedule an icmp packet to be received + * locally and sent to userspace. + * @icmph: pointer to the header of the icmp packet + * @icmp_len: total length of the icmp packet + */ +void batadv_socket_receive_packet(struct batadv_icmp_header *icmph, size_t icmp_len) { struct batadv_socket_client *hash;

- hash = batadv_socket_client_hash[icmp_packet->icmph.uid]; + hash = batadv_socket_client_hash[icmph->uid]; if (hash) - batadv_socket_add_packet(hash, icmp_packet, icmp_len); + batadv_socket_add_packet(hash, icmph, icmp_len); } diff --git a/net/batman-adv/icmp_socket.h b/net/batman-adv/icmp_socket.h index 1fcca37..6665080 100644 --- a/net/batman-adv/icmp_socket.h +++ b/net/batman-adv/icmp_socket.h @@ -24,7 +24,7 @@

void batadv_socket_init(void); int batadv_socket_setup(struct batadv_priv *bat_priv); -void batadv_socket_receive_packet(struct batadv_icmp_packet_rr *icmp_packet, +void batadv_socket_receive_packet(struct batadv_icmp_header *icmph, size_t icmp_len);

#endif /* _NET_BATMAN_ADV_ICMP_SOCKET_H_ */ diff --git a/net/batman-adv/packet.h b/net/batman-adv/packet.h index 843b96a..207459b 100644 --- a/net/batman-adv/packet.h +++ b/net/batman-adv/packet.h @@ -239,6 +239,8 @@ struct batadv_icmp_packet_rr { uint8_t rr[BATADV_RR_LEN][ETH_ALEN]; };

+#define BATADV_ICMP_MAX_PACKET_SIZE sizeof(struct batadv_icmp_packet_rr) + /* All packet headers in front of an ethernet header have to be completely * divisible by 2 but not by 4 to make the payload after the ethernet * header again 4 bytes boundary aligned. diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c index 71fba14..d4114d7 100644 --- a/net/batman-adv/routing.c +++ b/net/batman-adv/routing.c @@ -260,47 +260,65 @@ bool batadv_check_management_packet(struct sk_buff *skb, return true; }

+/** + * batadv_recv_my_icmp_packet - receive an icmp packet locally + * @bat_priv: the bat priv with all the soft interface information + * @skb: icmp packet to process + * + * Returns NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP + * otherwise. + */ static int batadv_recv_my_icmp_packet(struct batadv_priv *bat_priv, - struct sk_buff *skb, size_t icmp_len) + struct sk_buff *skb) { struct batadv_hard_iface *primary_if = NULL; struct batadv_orig_node *orig_node = NULL; - struct batadv_icmp_packet_rr *icmp_packet; - int ret = NET_RX_DROP; + struct batadv_icmp_header *icmph; + int res, ret = NET_RX_DROP;

- icmp_packet = (struct batadv_icmp_packet_rr *)skb->data; + icmph = (struct batadv_icmp_header *)skb->data;

- /* add data to device queue */ - if (icmp_packet->icmph.msg_type != BATADV_ECHO_REQUEST) { - batadv_socket_receive_packet(icmp_packet, icmp_len); - goto out; - } + switch (icmph->msg_type) { + case BATADV_ECHO_REPLY: + case BATADV_DESTINATION_UNREACHABLE: + case BATADV_TTL_EXCEEDED: + /* receive the packet */ + if (skb_linearize(skb) < 0) + break;

- primary_if = batadv_primary_if_get_selected(bat_priv); - if (!primary_if) - goto out; + batadv_socket_receive_packet(icmph, skb->len); + break; + case BATADV_ECHO_REQUEST: + /* answer echo request (ping) */ + primary_if = batadv_primary_if_get_selected(bat_priv); + if (!primary_if) + goto out;

- /* answer echo request (ping) */ - /* get routing information */ - orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->icmph.orig); - if (!orig_node) - goto out; + /* get routing information */ + orig_node = batadv_orig_hash_find(bat_priv, icmph->orig); + if (!orig_node) + goto out;

- /* create a copy of the skb, if needed, to modify it. */ - if (skb_cow(skb, ETH_HLEN) < 0) - goto out; + /* create a copy of the skb, if needed, to modify it. */ + if (skb_cow(skb, ETH_HLEN) < 0) + goto out;

- icmp_packet = (struct batadv_icmp_packet_rr *)skb->data; + icmph = (struct batadv_icmp_header *)skb->data;

- memcpy(icmp_packet->icmph.dst, icmp_packet->icmph.orig, ETH_ALEN); - memcpy(icmp_packet->icmph.orig, primary_if->net_dev->dev_addr, - ETH_ALEN); - icmp_packet->icmph.msg_type = BATADV_ECHO_REPLY; - icmp_packet->icmph.header.ttl = BATADV_TTL; + memcpy(icmph->dst, icmph->orig, ETH_ALEN); + memcpy(icmph->orig, primary_if->net_dev->dev_addr, ETH_ALEN); + icmph->msg_type = BATADV_ECHO_REPLY; + icmph->header.ttl = BATADV_TTL;

- if (batadv_send_skb_to_orig(skb, orig_node, NULL) != NET_XMIT_DROP) - ret = NET_RX_SUCCESS; + res = batadv_send_skb_to_orig(skb, orig_node, NULL); + if (res != NET_XMIT_DROP) + ret = NET_RX_SUCCESS;

+ break; + default: + /* drop unknown type */ + goto out; + } out: if (primary_if) batadv_hardif_free_ref(primary_if); @@ -363,16 +381,13 @@ int batadv_recv_icmp_packet(struct sk_buff *skb, struct batadv_hard_iface *recv_if) { struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); - struct batadv_icmp_packet_rr *icmp_packet; + struct batadv_icmp_header *icmph; + struct batadv_icmp_packet_rr *icmp_packet_rr; struct ethhdr *ethhdr; struct batadv_orig_node *orig_node = NULL; - int hdr_size = sizeof(struct batadv_icmp_packet); + int hdr_size = sizeof(struct batadv_icmp_header); int ret = NET_RX_DROP;

- /* we truncate all incoming icmp packets if they don't match our size */ - if (skb->len >= sizeof(struct batadv_icmp_packet_rr)) - hdr_size = sizeof(struct batadv_icmp_packet_rr); - /* drop packet if it has not necessary minimum size */ if (unlikely(!pskb_may_pull(skb, hdr_size))) goto out; @@ -391,28 +406,39 @@ int batadv_recv_icmp_packet(struct sk_buff *skb, if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest)) goto out;

- icmp_packet = (struct batadv_icmp_packet_rr *)skb->data; + icmph = (struct batadv_icmp_header *)skb->data;

/* add record route information if not full */ - if ((icmp_packet->icmph.msg_type == BATADV_ECHO_REPLY || - icmp_packet->icmph.msg_type == BATADV_ECHO_REQUEST) && - (hdr_size == sizeof(struct batadv_icmp_packet_rr)) && - (icmp_packet->rr_cur < BATADV_RR_LEN)) { - memcpy(&(icmp_packet->rr[icmp_packet->rr_cur]), + if ((icmph->msg_type == BATADV_ECHO_REPLY || + icmph->msg_type == BATADV_ECHO_REQUEST) && + (skb->len >= sizeof(struct batadv_icmp_packet_rr))) { + if (skb_linearize(skb) < 0) + goto out; + + /* create a copy of the skb, if needed, to modify it. */ + if (skb_cow(skb, ETH_HLEN) < 0) + goto out; + + icmph = (struct batadv_icmp_header *)skb->data; + icmp_packet_rr = (struct batadv_icmp_packet_rr *)icmph; + if (icmp_packet_rr->rr_cur >= BATADV_RR_LEN) + goto out; + + memcpy(&(icmp_packet_rr->rr[icmp_packet_rr->rr_cur]), ethhdr->h_dest, ETH_ALEN); - icmp_packet->rr_cur++; + icmp_packet_rr->rr_cur++; }

/* packet for me */ - if (batadv_is_my_mac(bat_priv, icmp_packet->icmph.dst)) - return batadv_recv_my_icmp_packet(bat_priv, skb, hdr_size); + if (batadv_is_my_mac(bat_priv, icmph->dst)) + return batadv_recv_my_icmp_packet(bat_priv, skb);

/* TTL exceeded */ - if (icmp_packet->icmph.header.ttl < 2) + if (icmph->header.ttl < 2) return batadv_recv_icmp_ttl_exceeded(bat_priv, skb);

/* get routing information */ - orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->icmph.dst); + orig_node = batadv_orig_hash_find(bat_priv, icmph->dst); if (!orig_node) goto out;

@@ -420,10 +446,10 @@ int batadv_recv_icmp_packet(struct sk_buff *skb, if (skb_cow(skb, ETH_HLEN) < 0) goto out;

- icmp_packet = (struct batadv_icmp_packet_rr *)skb->data; + icmph = (struct batadv_icmp_header *)skb->data;

/* decrement ttl */ - icmp_packet->icmph.header.ttl--; + icmph->header.ttl--;

/* route it */ if (batadv_send_skb_to_orig(skb, orig_node, recv_if) != NET_XMIT_DROP) diff --git a/net/batman-adv/types.h b/net/batman-adv/types.h index 3c21162..91dd369 100644 --- a/net/batman-adv/types.h +++ b/net/batman-adv/types.h @@ -749,7 +749,7 @@ struct batadv_socket_client { struct batadv_socket_packet { struct list_head list; size_t icmp_len; - struct batadv_icmp_packet_rr icmp_packet; + uint8_t icmp_packet[BATADV_ICMP_MAX_PACKET_SIZE]; };

/**