diff options
Diffstat (limited to 'net/batman-adv/routing.c')
| -rw-r--r-- | net/batman-adv/routing.c | 983 |
1 files changed, 566 insertions, 417 deletions
diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c index 827414067e46..c172f5d0e05a 100644 --- a/net/batman-adv/routing.c +++ b/net/batman-adv/routing.c @@ -35,35 +35,33 @@ #include "gateway_client.h" #include "unicast.h" -void slide_own_bcast_window(struct batman_if *batman_if) +void slide_own_bcast_window(struct hard_iface *hard_iface) { - struct bat_priv *bat_priv = netdev_priv(batman_if->soft_iface); + struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface); struct hashtable_t *hash = bat_priv->orig_hash; - struct hlist_node *walk; + struct hlist_node *node; struct hlist_head *head; - struct element_t *bucket; struct orig_node *orig_node; unsigned long *word; int i; size_t word_index; - spin_lock_bh(&bat_priv->orig_hash_lock); - for (i = 0; i < hash->size; i++) { head = &hash->table[i]; - hlist_for_each_entry(bucket, walk, head, hlist) { - orig_node = bucket->data; - word_index = batman_if->if_num * NUM_WORDS; + rcu_read_lock(); + hlist_for_each_entry_rcu(orig_node, node, head, hash_entry) { + spin_lock_bh(&orig_node->ogm_cnt_lock); + word_index = hard_iface->if_num * NUM_WORDS; word = &(orig_node->bcast_own[word_index]); bit_get_packet(bat_priv, word, 1, 0); - orig_node->bcast_own_sum[batman_if->if_num] = + orig_node->bcast_own_sum[hard_iface->if_num] = bit_packet_count(word); + spin_unlock_bh(&orig_node->ogm_cnt_lock); } + rcu_read_unlock(); } - - spin_unlock_bh(&bat_priv->orig_hash_lock); } static void update_HNA(struct bat_priv *bat_priv, struct orig_node *orig_node, @@ -89,6 +87,8 @@ static void update_route(struct bat_priv *bat_priv, struct neigh_node *neigh_node, unsigned char *hna_buff, int hna_buff_len) { + struct neigh_node *neigh_node_tmp; + /* route deleted */ if ((orig_node->router) && (!neigh_node)) { @@ -115,7 +115,12 @@ static void update_route(struct bat_priv *bat_priv, orig_node->router->addr); } + if (neigh_node && !atomic_inc_not_zero(&neigh_node->refcount)) + neigh_node = NULL; + neigh_node_tmp = orig_node->router; orig_node->router = neigh_node; + if (neigh_node_tmp) + neigh_node_free_ref(neigh_node_tmp); } @@ -138,73 +143,93 @@ void update_routes(struct bat_priv *bat_priv, struct orig_node *orig_node, static int is_bidirectional_neigh(struct orig_node *orig_node, struct orig_node *orig_neigh_node, struct batman_packet *batman_packet, - struct batman_if *if_incoming) + struct hard_iface *if_incoming) { struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface); - struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL; + struct neigh_node *neigh_node = NULL, *tmp_neigh_node; + struct hlist_node *node; unsigned char total_count; + uint8_t orig_eq_count, neigh_rq_count, tq_own; + int tq_asym_penalty, ret = 0; if (orig_node == orig_neigh_node) { - list_for_each_entry(tmp_neigh_node, - &orig_node->neigh_list, - list) { - - if (compare_orig(tmp_neigh_node->addr, - orig_neigh_node->orig) && - (tmp_neigh_node->if_incoming == if_incoming)) - neigh_node = tmp_neigh_node; + rcu_read_lock(); + hlist_for_each_entry_rcu(tmp_neigh_node, node, + &orig_node->neigh_list, list) { + + if (!compare_eth(tmp_neigh_node->addr, + orig_neigh_node->orig)) + continue; + + if (tmp_neigh_node->if_incoming != if_incoming) + continue; + + if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) + continue; + + neigh_node = tmp_neigh_node; } + rcu_read_unlock(); if (!neigh_node) neigh_node = create_neighbor(orig_node, orig_neigh_node, orig_neigh_node->orig, if_incoming); - /* create_neighbor failed, return 0 */ if (!neigh_node) - return 0; + goto out; neigh_node->last_valid = jiffies; } else { /* find packet count of corresponding one hop neighbor */ - list_for_each_entry(tmp_neigh_node, - &orig_neigh_node->neigh_list, list) { + rcu_read_lock(); + hlist_for_each_entry_rcu(tmp_neigh_node, node, + &orig_neigh_node->neigh_list, list) { + + if (!compare_eth(tmp_neigh_node->addr, + orig_neigh_node->orig)) + continue; + + if (tmp_neigh_node->if_incoming != if_incoming) + continue; - if (compare_orig(tmp_neigh_node->addr, - orig_neigh_node->orig) && - (tmp_neigh_node->if_incoming == if_incoming)) - neigh_node = tmp_neigh_node; + if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) + continue; + + neigh_node = tmp_neigh_node; } + rcu_read_unlock(); if (!neigh_node) neigh_node = create_neighbor(orig_neigh_node, orig_neigh_node, orig_neigh_node->orig, if_incoming); - /* create_neighbor failed, return 0 */ if (!neigh_node) - return 0; + goto out; } orig_node->last_valid = jiffies; + spin_lock_bh(&orig_node->ogm_cnt_lock); + orig_eq_count = orig_neigh_node->bcast_own_sum[if_incoming->if_num]; + neigh_rq_count = neigh_node->real_packet_count; + spin_unlock_bh(&orig_node->ogm_cnt_lock); + /* pay attention to not get a value bigger than 100 % */ - total_count = (orig_neigh_node->bcast_own_sum[if_incoming->if_num] > - neigh_node->real_packet_count ? - neigh_node->real_packet_count : - orig_neigh_node->bcast_own_sum[if_incoming->if_num]); + total_count = (orig_eq_count > neigh_rq_count ? + neigh_rq_count : orig_eq_count); /* if we have too few packets (too less data) we set tq_own to zero */ /* if we receive too few packets it is not considered bidirectional */ if ((total_count < TQ_LOCAL_BIDRECT_SEND_MINIMUM) || - (neigh_node->real_packet_count < TQ_LOCAL_BIDRECT_RECV_MINIMUM)) - orig_neigh_node->tq_own = 0; + (neigh_rq_count < TQ_LOCAL_BIDRECT_RECV_MINIMUM)) + tq_own = 0; else /* neigh_node->real_packet_count is never zero as we * only purge old information when getting new * information */ - orig_neigh_node->tq_own = (TQ_MAX_VALUE * total_count) / - neigh_node->real_packet_count; + tq_own = (TQ_MAX_VALUE * total_count) / neigh_rq_count; /* * 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does @@ -212,20 +237,16 @@ static int is_bidirectional_neigh(struct orig_node *orig_node, * punishes asymmetric links more. This will give a value * between 0 and TQ_MAX_VALUE */ - orig_neigh_node->tq_asym_penalty = - TQ_MAX_VALUE - - (TQ_MAX_VALUE * - (TQ_LOCAL_WINDOW_SIZE - neigh_node->real_packet_count) * - (TQ_LOCAL_WINDOW_SIZE - neigh_node->real_packet_count) * - (TQ_LOCAL_WINDOW_SIZE - neigh_node->real_packet_count)) / - (TQ_LOCAL_WINDOW_SIZE * - TQ_LOCAL_WINDOW_SIZE * - TQ_LOCAL_WINDOW_SIZE); - - batman_packet->tq = ((batman_packet->tq * - orig_neigh_node->tq_own * - orig_neigh_node->tq_asym_penalty) / - (TQ_MAX_VALUE * TQ_MAX_VALUE)); + tq_asym_penalty = TQ_MAX_VALUE - (TQ_MAX_VALUE * + (TQ_LOCAL_WINDOW_SIZE - neigh_rq_count) * + (TQ_LOCAL_WINDOW_SIZE - neigh_rq_count) * + (TQ_LOCAL_WINDOW_SIZE - neigh_rq_count)) / + (TQ_LOCAL_WINDOW_SIZE * + TQ_LOCAL_WINDOW_SIZE * + TQ_LOCAL_WINDOW_SIZE); + + batman_packet->tq = ((batman_packet->tq * tq_own * tq_asym_penalty) / + (TQ_MAX_VALUE * TQ_MAX_VALUE)); bat_dbg(DBG_BATMAN, bat_priv, "bidirectional: " @@ -233,34 +254,141 @@ static int is_bidirectional_neigh(struct orig_node *orig_node, "real recv = %2i, local tq: %3i, asym_penalty: %3i, " "total tq: %3i\n", orig_node->orig, orig_neigh_node->orig, total_count, - neigh_node->real_packet_count, orig_neigh_node->tq_own, - orig_neigh_node->tq_asym_penalty, batman_packet->tq); + neigh_rq_count, tq_own, tq_asym_penalty, batman_packet->tq); /* if link has the minimum required transmission quality * consider it bidirectional */ if (batman_packet->tq >= TQ_TOTAL_BIDRECT_LIMIT) - return 1; + ret = 1; - return 0; +out: + if (neigh_node) + neigh_node_free_ref(neigh_node); + return ret; +} + +/* caller must hold the neigh_list_lock */ +void bonding_candidate_del(struct orig_node *orig_node, + struct neigh_node *neigh_node) +{ + /* this neighbor is not part of our candidate list */ + if (list_empty(&neigh_node->bonding_list)) + goto out; + + list_del_rcu(&neigh_node->bonding_list); + INIT_LIST_HEAD(&neigh_node->bonding_list); + neigh_node_free_ref(neigh_node); + atomic_dec(&orig_node->bond_candidates); + +out: + return; +} + +static void bonding_candidate_add(struct orig_node *orig_node, + struct neigh_node *neigh_node) +{ + struct hlist_node *node; + struct neigh_node *tmp_neigh_node; + uint8_t best_tq, interference_candidate = 0; + + spin_lock_bh(&orig_node->neigh_list_lock); + + /* only consider if it has the same primary address ... */ + if (!compare_eth(orig_node->orig, + neigh_node->orig_node->primary_addr)) + goto candidate_del; + + if (!orig_node->router) + goto candidate_del; + + best_tq = orig_node->router->tq_avg; + + /* ... and is good enough to be considered */ + if (neigh_node->tq_avg < best_tq - BONDING_TQ_THRESHOLD) + goto candidate_del; + + /** + * check if we have another candidate with the same mac address or + * interface. If we do, we won't select this candidate because of + * possible interference. + */ + hlist_for_each_entry_rcu(tmp_neigh_node, node, + &orig_node->neigh_list, list) { + + if (tmp_neigh_node == neigh_node) + continue; + + /* we only care if the other candidate is even + * considered as candidate. */ + if (list_empty(&tmp_neigh_node->bonding_list)) + continue; + + if ((neigh_node->if_incoming == tmp_neigh_node->if_incoming) || + (compare_eth(neigh_node->addr, tmp_neigh_node->addr))) { + interference_candidate = 1; + break; + } + } + + /* don't care further if it is an interference candidate */ + if (interference_candidate) + goto candidate_del; + + /* this neighbor already is part of our candidate list */ + if (!list_empty(&neigh_node->bonding_list)) + goto out; + + if (!atomic_inc_not_zero(&neigh_node->refcount)) + goto out; + + list_add_rcu(&neigh_node->bonding_list, &orig_node->bond_list); + atomic_inc(&orig_node->bond_candidates); + goto out; + +candidate_del: + bonding_candidate_del(orig_node, neigh_node); + +out: + spin_unlock_bh(&orig_node->neigh_list_lock); + return; +} + +/* copy primary address for bonding */ +static void bonding_save_primary(struct orig_node *orig_node, + struct orig_node *orig_neigh_node, + struct batman_packet *batman_packet) +{ + if (!(batman_packet->flags & PRIMARIES_FIRST_HOP)) + return; + + memcpy(orig_neigh_node->primary_addr, orig_node->orig, ETH_ALEN); } static void update_orig(struct bat_priv *bat_priv, struct orig_node *orig_node, struct ethhdr *ethhdr, struct batman_packet *batman_packet, - struct batman_if *if_incoming, + struct hard_iface *if_incoming, unsigned char *hna_buff, int hna_buff_len, char is_duplicate) { struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL; + struct orig_node *orig_node_tmp; + struct hlist_node *node; int tmp_hna_buff_len; + uint8_t bcast_own_sum_orig, bcast_own_sum_neigh; bat_dbg(DBG_BATMAN, bat_priv, "update_originator(): " "Searching and updating originator entry of received packet\n"); - list_for_each_entry(tmp_neigh_node, &orig_node->neigh_list, list) { - if (compare_orig(tmp_neigh_node->addr, ethhdr->h_source) && - (tmp_neigh_node->if_incoming == if_incoming)) { + rcu_read_lock(); + hlist_for_each_entry_rcu(tmp_neigh_node, node, + &orig_node->neigh_list, list) { + if (compare_eth(tmp_neigh_node->addr, ethhdr->h_source) && + (tmp_neigh_node->if_incoming == if_incoming) && + atomic_inc_not_zero(&tmp_neigh_node->refcount)) { + if (neigh_node) + neigh_node_free_ref(neigh_node); neigh_node = tmp_neigh_node; continue; } @@ -279,16 +407,20 @@ static void update_orig(struct bat_priv *bat_priv, orig_tmp = get_orig_node(bat_priv, ethhdr->h_source); if (!orig_tmp) - return; + goto unlock; neigh_node = create_neighbor(orig_node, orig_tmp, ethhdr->h_source, if_incoming); + + orig_node_free_ref(orig_tmp); if (!neigh_node) - return; + goto unlock; } else bat_dbg(DBG_BATMAN, bat_priv, "Updating existing last-hop neighbor of originator\n"); + rcu_read_unlock(); + orig_node->flags = batman_packet->flags; neigh_node->last_valid = jiffies; @@ -302,6 +434,8 @@ static void update_orig(struct bat_priv *bat_priv, neigh_node->last_ttl = batman_packet->ttl; } + bonding_candidate_add(orig_node, neigh_node); + tmp_hna_buff_len = (hna_buff_len > batman_packet->num_hna * ETH_ALEN ? batman_packet->num_hna * ETH_ALEN : hna_buff_len); @@ -318,10 +452,22 @@ static void update_orig(struct bat_priv *bat_priv, /* if the TQ is the same and the link not more symetric we * won't consider it either */ if ((orig_node->router) && - ((neigh_node->tq_avg == orig_node->router->tq_avg) && - (orig_node->router->orig_node->bcast_own_sum[if_incoming->if_num] - >= neigh_node->orig_node->bcast_own_sum[if_incoming->if_num]))) - goto update_hna; + (neigh_node->tq_avg == orig_node->router->tq_avg)) { + orig_node_tmp = orig_node->router->orig_node; + spin_lock_bh(&orig_node_tmp->ogm_cnt_lock); + bcast_own_sum_orig = + orig_node_tmp->bcast_own_sum[if_incoming->if_num]; + spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock); + + orig_node_tmp = neigh_node->orig_node; + spin_lock_bh(&orig_node_tmp->ogm_cnt_lock); + bcast_own_sum_neigh = + orig_node_tmp->bcast_own_sum[if_incoming->if_num]; + spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock); + + if (bcast_own_sum_orig >= bcast_own_sum_neigh) + goto update_hna; + } update_routes(bat_priv, orig_node, neigh_node, hna_buff, tmp_hna_buff_len); @@ -342,6 +488,14 @@ update_gw: (atomic_read(&bat_priv->gw_mode) == GW_MODE_CLIENT) && (atomic_read(&bat_priv->gw_sel_class) > 2)) gw_check_election(bat_priv, orig_node); + + goto out; + +unlock: + rcu_read_unlock(); +out: + if (neigh_node) + neigh_node_free_ref(neigh_node); } /* checks whether the host restarted and is in the protection time. @@ -379,34 +533,38 @@ static int window_protected(struct bat_priv *bat_priv, */ static char count_real_packets(struct ethhdr *ethhdr, struct batman_packet *batman_packet, - struct batman_if *if_incoming) + struct hard_iface *if_incoming) { struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface); struct orig_node *orig_node; struct neigh_node *tmp_neigh_node; + struct hlist_node *node; char is_duplicate = 0; int32_t seq_diff; int need_update = 0; - int set_mark; + int set_mark, ret = -1; orig_node = get_orig_node(bat_priv, batman_packet->orig); if (!orig_node) return 0; + spin_lock_bh(&orig_node->ogm_cnt_lock); seq_diff = batman_packet->seqno - orig_node->last_real_seqno; /* signalize caller that the packet is to be dropped. */ if (window_protected(bat_priv, seq_diff, &orig_node->batman_seqno_reset)) - return -1; + goto out; - list_for_each_entry(tmp_neigh_node, &orig_node->neigh_list, list) { + rcu_read_lock(); + hlist_for_each_entry_rcu(tmp_neigh_node, node, + &orig_node->neigh_list, list) { is_duplicate |= get_bit_status(tmp_neigh_node->real_bits, orig_node->last_real_seqno, batman_packet->seqno); - if (compare_orig(tmp_neigh_node->addr, ethhdr->h_source) && + if (compare_eth(tmp_neigh_node->addr, ethhdr->h_source) && (tmp_neigh_node->if_incoming == if_incoming)) set_mark = 1; else @@ -420,6 +578,7 @@ static char count_real_packets(struct ethhdr *ethhdr, tmp_neigh_node->real_packet_count = bit_packet_count(tmp_neigh_node->real_bits); } + rcu_read_unlock(); if (need_update) { bat_dbg(DBG_BATMAN, bat_priv, @@ -428,121 +587,21 @@ static char count_real_packets(struct ethhdr *ethhdr, orig_node->last_real_seqno = batman_packet->seqno; } - return is_duplicate; -} - -/* copy primary address for bonding */ -static void mark_bonding_address(struct orig_node *orig_node, - struct orig_node *orig_neigh_node, - struct batman_packet *batman_packet) - -{ - if (batman_packet->flags & PRIMARIES_FIRST_HOP) - memcpy(orig_neigh_node->primary_addr, - orig_node->orig, ETH_ALEN); - - return; -} - -/* mark possible bond.candidates in the neighbor list */ -void update_bonding_candidates(struct orig_node *orig_node) -{ - int candidates; - int interference_candidate; - int best_tq; - struct neigh_node *tmp_neigh_node, *tmp_neigh_node2; - struct neigh_node *first_candidate, *last_candidate; - - /* update the candidates for this originator */ - if (!orig_node->router) { - orig_node->bond.candidates = 0; - return; - } - - best_tq = orig_node->router->tq_avg; - - /* update bond.candidates */ - - candidates = 0; - - /* mark other nodes which also received "PRIMARIES FIRST HOP" packets - * as "bonding partner" */ - - /* first, zero the list */ - list_for_each_entry(tmp_neigh_node, &orig_node->neigh_list, list) { - tmp_neigh_node->next_bond_candidate = NULL; - } - - first_candidate = NULL; - last_candidate = NULL; - list_for_each_entry(tmp_neigh_node, &orig_node->neigh_list, list) { - - /* only consider if it has the same primary address ... */ - if (memcmp(orig_node->orig, - tmp_neigh_node->orig_node->primary_addr, - ETH_ALEN) != 0) - continue; - - /* ... and is good enough to be considered */ - if (tmp_neigh_node->tq_avg < best_tq - BONDING_TQ_THRESHOLD) - continue; - - /* check if we have another candidate with the same - * mac address or interface. If we do, we won't - * select this candidate because of possible interference. */ - - interference_candidate = 0; - list_for_each_entry(tmp_neigh_node2, - &orig_node->neigh_list, list) { - - if (tmp_neigh_node2 == tmp_neigh_node) - continue; - - /* we only care if the other candidate is even - * considered as candidate. */ - if (!tmp_neigh_node2->next_bond_candidate) - continue; - - - if ((tmp_neigh_node->if_incoming == - tmp_neigh_node2->if_incoming) - || (memcmp(tmp_neigh_node->addr, - tmp_neigh_node2->addr, ETH_ALEN) == 0)) { - - interference_candidate = 1; - break; - } - } - /* don't care further if it is an interference candidate */ - if (interference_candidate) - continue; - - if (!first_candidate) { - first_candidate = tmp_neigh_node; - tmp_neigh_node->next_bond_candidate = first_candidate; - } else - tmp_neigh_node->next_bond_candidate = last_candidate; - - last_candidate = tmp_neigh_node; - - candidates++; - } - - if (candidates > 0) { - first_candidate->next_bond_candidate = last_candidate; - orig_node->bond.selected = first_candidate; - } + ret = is_duplicate; - orig_node->bond.candidates = candidates; +out: + spin_unlock_bh(&orig_node->ogm_cnt_lock); + orig_node_free_ref(orig_node); + return ret; } void receive_bat_packet(struct ethhdr *ethhdr, - struct batman_packet *batman_packet, - unsigned char *hna_buff, int hna_buff_len, - struct batman_if *if_incoming) + struct batman_packet *batman_packet, + unsigned char *hna_buff, int hna_buff_len, + struct hard_iface *if_incoming) { struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface); - struct batman_if *batman_if; + struct hard_iface *hard_iface; struct orig_node *orig_neigh_node, *orig_node; char has_directlink_flag; char is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0; @@ -570,8 +629,8 @@ void receive_bat_packet(struct ethhdr *ethhdr, has_directlink_flag = (batman_packet->flags & DIRECTLINK ? 1 : 0); - is_single_hop_neigh = (compare_orig(ethhdr->h_source, - batman_packet->orig) ? 1 : 0); + is_single_hop_neigh = (compare_eth(ethhdr->h_source, + batman_packet->orig) ? 1 : 0); bat_dbg(DBG_BATMAN, bat_priv, "Received BATMAN packet via NB: %pM, IF: %s [%pM] " @@ -584,26 +643,26 @@ void receive_bat_packet(struct ethhdr *ethhdr, has_directlink_flag); rcu_read_lock(); - list_for_each_entry_rcu(batman_if, &if_list, list) { - if (batman_if->if_status != IF_ACTIVE) + list_for_each_entry_rcu(hard_iface, &hardif_list, list) { + if (hard_iface->if_status != IF_ACTIVE) continue; - if (batman_if->soft_iface != if_incoming->soft_iface) + if (hard_iface->soft_iface != if_incoming->soft_iface) continue; - if (compare_orig(ethhdr->h_source, - batman_if->net_dev->dev_addr)) + if (compare_eth(ethhdr->h_source, + hard_iface->net_dev->dev_addr)) is_my_addr = 1; - if (compare_orig(batman_packet->orig, - batman_if->net_dev->dev_addr)) + if (compare_eth(batman_packet->orig, + hard_iface->net_dev->dev_addr)) is_my_orig = 1; - if (compare_orig(batman_packet->prev_sender, - batman_if->net_dev->dev_addr)) + if (compare_eth(batman_packet->prev_sender, + hard_iface->net_dev->dev_addr)) is_my_oldorig = 1; - if (compare_orig(ethhdr->h_source, broadcast_addr)) + if (compare_eth(ethhdr->h_source, broadcast_addr)) is_broadcast = 1; } rcu_read_unlock(); @@ -635,7 +694,6 @@ void receive_bat_packet(struct ethhdr *ethhdr, int offset; orig_neigh_node = get_orig_node(bat_priv, ethhdr->h_source); - if (!orig_neigh_node) return; @@ -644,18 +702,22 @@ void receive_bat_packet(struct ethhdr *ethhdr, /* if received seqno equals last send seqno save new * seqno for bidirectional check */ if (has_directlink_flag && - compare_orig(if_incoming->net_dev->dev_addr, - batman_packet->orig) && + compare_eth(if_incoming->net_dev->dev_addr, + batman_packet->orig) && (batman_packet->seqno - if_incoming_seqno + 2 == 0)) { offset = if_incoming->if_num * NUM_WORDS; + + spin_lock_bh(&orig_neigh_node->ogm_cnt_lock); word = &(orig_neigh_node->bcast_own[offset]); bit_mark(word, 0); orig_neigh_node->bcast_own_sum[if_incoming->if_num] = bit_packet_count(word); + spin_unlock_bh(&orig_neigh_node->ogm_cnt_lock); } bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: " "originator packet from myself (via neighbor)\n"); + orig_node_free_ref(orig_neigh_node); return; } @@ -676,27 +738,27 @@ void receive_bat_packet(struct ethhdr *ethhdr, bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: packet within seqno protection time " "(sender: %pM)\n", ethhdr->h_source); - return; + goto out; } if (batman_packet->tq == 0) { bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: originator packet with tq equal 0\n"); - return; + goto out; } /* avoid temporary routing loops */ if ((orig_node->router) && (orig_node->router->orig_node->router) && - (compare_orig(orig_node->router->addr, - batman_packet->prev_sender)) && - !(compare_orig(batman_packet->orig, batman_packet->prev_sender)) && - (compare_orig(orig_node->router->addr, - orig_node->router->orig_node->router->addr))) { + (compare_eth(orig_node->router->addr, + batman_packet->prev_sender)) && + !(compare_eth(batman_packet->orig, batman_packet->prev_sender)) && + (compare_eth(orig_node->router->addr, + orig_node->router->orig_node->router->addr))) { bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: ignoring all rebroadcast packets that " "may make me loop (sender: %pM)\n", ethhdr->h_source); - return; + goto out; } /* if sender is a direct neighbor the sender mac equals @@ -705,19 +767,21 @@ void receive_bat_packet(struct ethhdr *ethhdr, orig_node : get_orig_node(bat_priv, ethhdr->h_source)); if (!orig_neigh_node) - return; + goto out; /* drop packet if sender is not a direct neighbor and if we * don't route towards it */ if (!is_single_hop_neigh && (!orig_neigh_node->router)) { bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: OGM via unknown neighbor!\n"); - return; + goto out_neigh; } is_bidirectional = is_bidirectional_neigh(orig_node, orig_neigh_node, batman_packet, if_incoming); + bonding_save_primary(orig_node, orig_neigh_node, batman_packet); + /* update ranking if it is not a duplicate or has the same * seqno and similar ttl as the non-duplicate */ if (is_bidirectional && @@ -727,9 +791,6 @@ void receive_bat_packet(struct ethhdr *ethhdr, update_orig(bat_priv, orig_node, ethhdr, batman_packet, if_incoming, hna_buff, hna_buff_len, is_duplicate); - mark_bonding_address(orig_node, orig_neigh_node, batman_packet); - update_bonding_candidates(orig_node); - /* is single hop (direct) neighbor */ if (is_single_hop_neigh) { @@ -739,31 +800,36 @@ void receive_bat_packet(struct ethhdr *ethhdr, bat_dbg(DBG_BATMAN, bat_priv, "Forwarding packet: " "rebroadcast neighbor packet with direct link flag\n"); - return; + goto out_neigh; } /* multihop originator */ if (!is_bidirectional) { bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: not received via bidirectional link\n"); - return; + goto out_neigh; } if (is_duplicate) { bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: duplicate packet received\n"); - return; + goto out_neigh; } bat_dbg(DBG_BATMAN, bat_priv, "Forwarding packet: rebroadcast originator packet\n"); schedule_forward_packet(orig_node, ethhdr, batman_packet, 0, hna_buff_len, if_incoming); + +out_neigh: + if ((orig_neigh_node) && (!is_single_hop_neigh)) + orig_node_free_ref(orig_neigh_node); +out: + orig_node_free_ref(orig_node); } -int recv_bat_packet(struct sk_buff *skb, struct batman_if *batman_if) +int recv_bat_packet(struct sk_buff *skb, struct hard_iface *hard_iface) { - struct bat_priv *bat_priv = netdev_priv(batman_if->soft_iface); struct ethhdr *ethhdr; /* drop packet if it has not necessary minimum size */ @@ -790,12 +856,10 @@ int recv_bat_packet(struct sk_buff *skb, struct batman_if *batman_if) ethhdr = (struct ethhdr *)skb_mac_header(skb); - spin_lock_bh(&bat_priv->orig_hash_lock); receive_aggr_bat_packet(ethhdr, skb->data, skb_headlen(skb), - batman_if); - spin_unlock_bh(&bat_priv->orig_hash_lock); + hard_iface); kfree_skb(skb); return NET_RX_SUCCESS; @@ -804,68 +868,75 @@ int recv_bat_packet(struct sk_buff *skb, struct batman_if *batman_if) static int recv_my_icmp_packet(struct bat_priv *bat_priv, struct sk_buff *skb, size_t icmp_len) { - struct orig_node *orig_node; + struct orig_node *orig_node = NULL; + struct neigh_node *neigh_node = NULL; struct icmp_packet_rr *icmp_packet; - struct batman_if *batman_if; - int ret; - uint8_t dstaddr[ETH_ALEN]; + int ret = NET_RX_DROP; icmp_packet = (struct icmp_packet_rr *)skb->data; /* add data to device queue */ if (icmp_packet->msg_type != ECHO_REQUEST) { bat_socket_receive_packet(icmp_packet, icmp_len); - return NET_RX_DROP; + goto out; } if (!bat_priv->primary_if) - return NET_RX_DROP; + goto out; /* answer echo request (ping) */ /* get routing information */ - spin_lock_bh(&bat_priv->orig_hash_lock); - orig_node = ((struct orig_node *)hash_find(bat_priv->orig_hash, - compare_orig, choose_orig, - icmp_packet->orig)); - ret = NET_RX_DROP; - - if ((orig_node) && (orig_node->router)) { - - /* don't lock while sending the packets ... we therefore - * copy the required data before sending */ - batman_if = orig_node->router->if_incoming; - memcpy(dstaddr, orig_node->router->addr, ETH_ALEN); - spin_unlock_bh(&bat_priv->orig_hash_lock); - - /* create a copy of the skb, if needed, to modify it. */ - if (skb_cow(skb, sizeof(struct ethhdr)) < 0) - return NET_RX_DROP; + rcu_read_lock(); + orig_node = orig_hash_find(bat_priv, icmp_packet->orig); + + if (!orig_node) + goto unlock; - icmp_packet = (struct icmp_packet_rr *)skb->data; + neigh_node = orig_node->router; - memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN); - memcpy(icmp_packet->orig, - bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN); - icmp_packet->msg_type = ECHO_REPLY; - icmp_packet->ttl = TTL; + if (!neigh_node) + goto unlock; - send_skb_packet(skb, batman_if, dstaddr); - ret = NET_RX_SUCCESS; + if (!atomic_inc_not_zero(&neigh_node->refcount)) { + neigh_node = NULL; + goto unlock; + } - } else - spin_unlock_bh(&bat_priv->orig_hash_lock); + rcu_read_unlock(); + + /* create a copy of the skb, if needed, to modify it. */ + if (skb_cow(skb, sizeof(struct ethhdr)) < 0) + goto out; + + icmp_packet = (struct icmp_packet_rr *)skb->data; + memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN); + memcpy(icmp_packet->orig, + bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN); + icmp_packet->msg_type = ECHO_REPLY; + icmp_packet->ttl = TTL; + + send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); + ret = NET_RX_SUCCESS; + goto out; + +unlock: + rcu_read_unlock(); +out: + if (neigh_node) + neigh_node_free_ref(neigh_node); + if (orig_node) + orig_node_free_ref(orig_node); return ret; } static int recv_icmp_ttl_exceeded(struct bat_priv *bat_priv, struct sk_buff *skb) { - struct orig_node *orig_node; + struct orig_node *orig_node = NULL; + struct neigh_node *neigh_node = NULL; struct icmp_packet *icmp_packet; - struct batman_if *batman_if; - int ret; - uint8_t dstaddr[ETH_ALEN]; + int ret = NET_RX_DROP; icmp_packet = (struct icmp_packet *)skb->data; @@ -874,59 +945,67 @@ static int recv_icmp_ttl_exceeded(struct bat_priv *bat_priv, pr_debug("Warning - can't forward icmp packet from %pM to " "%pM: ttl exceeded\n", icmp_packet->orig, icmp_packet->dst); - return NET_RX_DROP; + goto out; } if (!bat_priv->primary_if) - return NET_RX_DROP; + goto out; /* get routing information */ - spin_lock_bh(&bat_priv->orig_hash_lock); - orig_node = ((struct orig_node *) - hash_find(bat_priv->orig_hash, compare_orig, choose_orig, - icmp_packet->orig)); - ret = NET_RX_DROP; - - if ((orig_node) && (orig_node->router)) { - - /* don't lock while sending the packets ... we therefore - * copy the required data before sending */ - batman_if = orig_node->router->if_incoming; - memcpy(dstaddr, orig_node->router->addr, ETH_ALEN); - spin_unlock_bh(&bat_priv->orig_hash_lock); - - /* create a copy of the skb, if needed, to modify it. */ - if (skb_cow(skb, sizeof(struct ethhdr)) < 0) - return NET_RX_DROP; + rcu_read_lock(); + orig_node = orig_hash_find(bat_priv, icmp_packet->orig); - icmp_packet = (struct icmp_packet *) skb->data; + if (!orig_node) + goto unlock; - memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN); - memcpy(icmp_packet->orig, - bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN); - icmp_packet->msg_type = TTL_EXCEEDED; - icmp_packet->ttl = TTL; + neigh_node = orig_node->router; - send_skb_packet(skb, batman_if, dstaddr); - ret = NET_RX_SUCCESS; + if (!neigh_node) + goto unlock; - } else - spin_unlock_bh(&bat_priv->orig_hash_lock); + if (!atomic_inc_not_zero(&neigh_node->refcount)) { + neigh_node = NULL; + goto unlock; + } + + rcu_read_unlock(); + + /* create a copy of the skb, if needed, to modify it. */ + if (skb_cow(skb, sizeof(struct ethhdr)) < 0) + goto out; + icmp_packet = (struct icmp_packet *)skb->data; + + memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN); + memcpy(icmp_packet->orig, + bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN); + icmp_packet->msg_type = TTL_EXCEEDED; + icmp_packet->ttl = TTL; + + send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); + ret = NET_RX_SUCCESS; + goto out; + +unlock: + rcu_read_unlock(); +out: + if (neigh_node) + neigh_node_free_ref(neigh_node); + if (orig_node) + orig_node_free_ref(orig_node); return ret; } -int recv_icmp_packet(struct sk_buff *skb, struct batman_if *recv_if) +int recv_icmp_packet(struct sk_buff *skb, struct hard_iface *recv_if) { struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); struct icmp_packet_rr *icmp_packet; struct ethhdr *ethhdr; - struct orig_node *orig_node; - struct batman_if *batman_if; + struct orig_node *orig_node = NULL; + struct neigh_node *neigh_node = NULL; int hdr_size = sizeof(struct icmp_packet); - int ret; - uint8_t dstaddr[ETH_ALEN]; + int ret = NET_RX_DROP; /** * we truncate all incoming icmp packets if they don't match our size @@ -936,21 +1015,21 @@ int recv_icmp_packet(struct sk_buff *skb, struct batman_if *recv_if) /* drop packet if it has not necessary minimum size */ if (unlikely(!pskb_may_pull(skb, hdr_size))) - return NET_RX_DROP; + goto out; ethhdr = (struct ethhdr *)skb_mac_header(skb); /* packet with unicast indication but broadcast recipient */ if (is_broadcast_ether_addr(ethhdr->h_dest)) - return NET_RX_DROP; + goto out; /* packet with broadcast sender address */ if (is_broadcast_ether_addr(ethhdr->h_source)) - return NET_RX_DROP; + goto out; /* not for me */ if (!is_my_mac(ethhdr->h_dest)) - return NET_RX_DROP; + goto out; icmp_packet = (struct icmp_packet_rr *)skb->data; @@ -970,50 +1049,59 @@ int recv_icmp_packet(struct sk_buff *skb, struct batman_if *recv_if) if (icmp_packet->ttl < 2) return recv_icmp_ttl_exceeded(bat_priv, skb); - ret = NET_RX_DROP; - /* get routing information */ - spin_lock_bh(&bat_priv->orig_hash_lock); - orig_node = ((struct orig_node *) - hash_find(bat_priv->orig_hash, compare_orig, choose_orig, - icmp_packet->dst)); + rcu_read_lock(); + orig_node = orig_hash_find(bat_priv, icmp_packet->dst); - if ((orig_node) && (orig_node->router)) { + if (!orig_node) + goto unlock; - /* don't lock while sending the packets ... we therefore - * copy the required data before sending */ - batman_if = orig_node->router->if_incoming; - memcpy(dstaddr, orig_node->router->addr, ETH_ALEN); - spin_unlock_bh(&bat_priv->orig_hash_lock); + neigh_node = orig_node->router; - /* create a copy of the skb, if needed, to modify it. */ - if (skb_cow(skb, sizeof(struct ethhdr)) < 0) - return NET_RX_DROP; + if (!neigh_node) + goto unlock; - icmp_packet = (struct icmp_packet_rr *)skb->data; + if (!atomic_inc_not_zero(&neigh_node->refcount)) { + neigh_node = NULL; + goto unlock; + } - /* decrement ttl */ - icmp_packet->ttl--; + rcu_read_unlock(); - /* route it */ - send_skb_packet(skb, batman_if, dstaddr); - ret = NET_RX_SUCCESS; + /* create a copy of the skb, if needed, to modify it. */ + if (skb_cow(skb, sizeof(struct ethhdr)) < 0) + goto out; - } else - spin_unlock_bh(&bat_priv->orig_hash_lock); + icmp_packet = (struct icmp_packet_rr *)skb->data; + + /* decrement ttl */ + icmp_packet->ttl--; + + /* route it */ + send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); + ret = NET_RX_SUCCESS; + goto out; +unlock: + rcu_read_unlock(); +out: + if (neigh_node) + neigh_node_free_ref(neigh_node); + if (orig_node) + orig_node_free_ref(orig_node); return ret; } /* find a suitable router for this originator, and use - * bonding if possible. */ + * bonding if possible. increases the found neighbors + * refcount.*/ struct neigh_node *find_router(struct bat_priv *bat_priv, struct orig_node *orig_node, - struct batman_if *recv_if) + struct hard_iface *recv_if) { struct orig_node *primary_orig_node; struct orig_node *router_orig; - struct neigh_node *router, *first_candidate, *best_router; + struct neigh_node *router, *first_candidate, *tmp_neigh_node; static uint8_t zero_mac[ETH_ALEN] = {0, 0, 0, 0, 0, 0}; int bonding_enabled; @@ -1025,78 +1113,128 @@ struct neigh_node *find_router(struct bat_priv *bat_priv, /* without bonding, the first node should * always choose the default router. */ - bonding_enabled = atomic_read(&bat_priv->bonding); - if ((!recv_if) && (!bonding_enabled)) - return orig_node->router; - + rcu_read_lock(); + /* select default router to output */ + router = orig_node->router; router_orig = orig_node->router->orig_node; + if (!router_orig || !atomic_inc_not_zero(&router->refcount)) { + rcu_read_unlock(); + return NULL; + } + + if ((!recv_if) && (!bonding_enabled)) + goto return_router; /* if we have something in the primary_addr, we can search * for a potential bonding candidate. */ - if (memcmp(router_orig->primary_addr, zero_mac, ETH_ALEN) == 0) - return orig_node->router; + if (compare_eth(router_orig->primary_addr, zero_mac)) + goto return_router; /* find the orig_node which has the primary interface. might * even be the same as our router_orig in many cases */ - if (memcmp(router_orig->primary_addr, - router_orig->orig, ETH_ALEN) == 0) { + if (compare_eth(router_orig->primary_addr, router_orig->orig)) { primary_orig_node = router_orig; } else { - primary_orig_node = hash_find(bat_priv->orig_hash, compare_orig, - choose_orig, - router_orig->primary_addr); - + primary_orig_node = orig_hash_find(bat_priv, + router_orig->primary_addr); if (!primary_orig_node) - return orig_node->router; + goto return_router; + + orig_node_free_ref(primary_orig_node); } /* with less than 2 candidates, we can't do any * bonding and prefer the original router. */ - - if (primary_orig_node->bond.candidates < 2) - return orig_node->router; + if (atomic_read(&primary_orig_node->bond_candidates) < 2) + goto return_router; /* all nodes between should choose a candidate which * is is not on the interface where the packet came * in. */ - first_candidate = primary_orig_node->bond.selected; - router = first_candidate; + + neigh_node_free_ref(router); + first_candidate = NULL; + router = NULL; if (bonding_enabled) { /* in the bonding case, send the packets in a round * robin fashion over the remaining interfaces. */ - do { + + list_for_each_entry_rcu(tmp_neigh_node, + &primary_orig_node->bond_list, bonding_list) { + if (!first_candidate) + first_candidate = tmp_neigh_node; /* recv_if == NULL on the first node. */ - if (router->if_incoming != recv_if) + if (tmp_neigh_node->if_incoming != recv_if && + atomic_inc_not_zero(&tmp_neigh_node->refcount)) { + router = tmp_neigh_node; break; + } + } - router = router->next_bond_candidate; - } while (router != first_candidate); + /* use the first candidate if nothing was found. */ + if (!router && first_candidate && + atomic_inc_not_zero(&first_candidate->refcount)) + router = first_candidate; - primary_orig_node->bond.selected = router->next_bond_candidate; + if (!router) { + rcu_read_unlock(); + return NULL; + } + + /* selected should point to the next element + * after the current router */ + spin_lock_bh(&primary_orig_node->neigh_list_lock); + /* this is a list_move(), which unfortunately + * does not exist as rcu version */ + list_del_rcu(&primary_orig_node->bond_list); + list_add_rcu(&primary_orig_node->bond_list, + &router->bonding_list); + spin_unlock_bh(&primary_orig_node->neigh_list_lock); } else { /* if bonding is disabled, use the best of the * remaining candidates which are not using * this interface. */ - best_router = first_candidate; + list_for_each_entry_rcu(tmp_neigh_node, + &primary_orig_node->bond_list, bonding_list) { + if (!first_candidate) + first_candidate = tmp_neigh_node; - do { /* recv_if == NULL on the first node. */ - if ((router->if_incoming != recv_if) && - (router->tq_avg > best_router->tq_avg)) - best_router = router; + if (tmp_neigh_node->if_incoming == recv_if) + continue; - router = router->next_bond_candidate; - } while (router != first_candidate); + if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) + continue; - router = best_router; - } + /* if we don't have a router yet + * or this one is better, choose it. */ + if ((!router) || + (tmp_neigh_node->tq_avg > router->tq_avg)) { + /* decrement refcount of + * previously selected router */ + if (router) + neigh_node_free_ref(router); + + router = tmp_neigh_node; + atomic_inc_not_zero(&router->refcount); + } + + neigh_node_free_ref(tmp_neigh_node); + } + /* use the first candidate if nothing was found. */ + if (!router && first_candidate && + atomic_inc_not_zero(&first_candidate->refcount)) + router = first_candidate; + } +return_router: + rcu_read_unlock(); return router; } @@ -1125,17 +1263,14 @@ static int check_unicast_packet(struct sk_buff *skb, int hdr_size) return 0; } -int route_unicast_packet(struct sk_buff *skb, struct batman_if *recv_if, - int hdr_size) +int route_unicast_packet(struct sk_buff *skb, struct hard_iface *recv_if) { struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); - struct orig_node *orig_node; - struct neigh_node *router; - struct batman_if *batman_if; - uint8_t dstaddr[ETH_ALEN]; + struct orig_node *orig_node = NULL; + struct neigh_node *neigh_node = NULL; struct unicast_packet *unicast_packet; struct ethhdr *ethhdr = (struct ethhdr *)skb_mac_header(skb); - int ret; + int ret = NET_RX_DROP; struct sk_buff *new_skb; unicast_packet = (struct unicast_packet *)skb->data; @@ -1145,53 +1280,51 @@ int route_unicast_packet(struct sk_buff *skb, struct batman_if *recv_if, pr_debug("Warning - can't forward unicast packet from %pM to " "%pM: ttl exceeded\n", ethhdr->h_source, unicast_packet->dest); - return NET_RX_DROP; + goto out; } /* get routing information */ - spin_lock_bh(&bat_priv->orig_hash_lock); - orig_node = ((struct orig_node *) - hash_find(bat_priv->orig_hash, compare_orig, choose_orig, - unicast_packet->dest)); - - router = find_router(bat_priv, orig_node, recv_if); + rcu_read_lock(); + orig_node = orig_hash_find(bat_priv, unicast_packet->dest); - if (!router) { - spin_unlock_bh(&bat_priv->orig_hash_lock); - return NET_RX_DROP; - } + if (!orig_node) + goto unlock; - /* don't lock while sending the packets ... we therefore - * copy the required data before sending */ + rcu_read_unlock(); - batman_if = router->if_incoming; - memcpy(dstaddr, router->addr, ETH_ALEN); + /* find_router() increases neigh_nodes refcount if found. */ + neigh_node = find_router(bat_priv, orig_node, recv_if); - spin_unlock_bh(&bat_priv->orig_hash_lock); + if (!neigh_node) + goto out; /* create a copy of the skb, if needed, to modify it. */ if (skb_cow(skb, sizeof(struct ethhdr)) < 0) - return NET_RX_DROP; + goto out; unicast_packet = (struct unicast_packet *)skb->data; if (unicast_packet->packet_type == BAT_UNICAST && atomic_read(&bat_priv->fragmentation) && - skb->len > batman_if->net_dev->mtu) - return frag_send_skb(skb, bat_priv, batman_if, - dstaddr); + skb->len > neigh_node->if_incoming->net_dev->mtu) { + ret = frag_send_skb(skb, bat_priv, + neigh_node->if_incoming, neigh_node->addr); + goto out; + } if (unicast_packet->packet_type == BAT_UNICAST_FRAG && - frag_can_reassemble(skb, batman_if->net_dev->mtu)) { + frag_can_reassemble(skb, neigh_node->if_incoming->net_dev->mtu)) { ret = frag_reassemble_skb(skb, bat_priv, &new_skb); if (ret == NET_RX_DROP) - return NET_RX_DROP; + goto out; /* packet was buffered for late merge */ - if (!new_skb) - return NET_RX_SUCCESS; + if (!new_skb) { + ret = NET_RX_SUCCESS; + goto out; + } skb = new_skb; unicast_packet = (struct unicast_packet *)skb->data; @@ -1201,12 +1334,21 @@ int route_unicast_packet(struct sk_buff *skb, struct batman_if *recv_if, unicast_packet->ttl--; /* route it */ - send_skb_packet(skb, batman_if, dstaddr); + send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); + ret = NET_RX_SUCCESS; + goto out; - return NET_RX_SUCCESS; +unlock: + rcu_read_unlock(); +out: + if (neigh_node) + neigh_node_free_ref(neigh_node); + if (orig_node) + orig_node_free_ref(orig_node); + return ret; } -int recv_unicast_packet(struct sk_buff *skb, struct batman_if *recv_if) +int recv_unicast_packet(struct sk_buff *skb, struct hard_iface *recv_if) { struct unicast_packet *unicast_packet; int hdr_size = sizeof(struct unicast_packet); @@ -1222,10 +1364,10 @@ int recv_unicast_packet(struct sk_buff *skb, struct batman_if *recv_if) return NET_RX_SUCCESS; } - return route_unicast_packet(skb, recv_if, hdr_size); + return route_unicast_packet(skb, recv_if); } -int recv_ucast_frag_packet(struct sk_buff *skb, struct batman_if *recv_if) +int recv_ucast_frag_packet(struct sk_buff *skb, struct hard_iface *recv_if) { struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); struct unicast_frag_packet *unicast_packet; @@ -1255,89 +1397,96 @@ int recv_ucast_frag_packet(struct sk_buff *skb, struct batman_if *recv_if) return NET_RX_SUCCESS; } - return route_unicast_packet(skb, recv_if, hdr_size); + return route_unicast_packet(skb, recv_if); } -int recv_bcast_packet(struct sk_buff *skb, struct batman_if *recv_if) +int recv_bcast_packet(struct sk_buff *skb, struct hard_iface *recv_if) { struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); - struct orig_node *orig_node; + struct orig_node *orig_node = NULL; struct bcast_packet *bcast_packet; struct ethhdr *ethhdr; int hdr_size = sizeof(struct bcast_packet); + int ret = NET_RX_DROP; int32_t seq_diff; /* drop packet if it has not necessary minimum size */ if (unlikely(!pskb_may_pull(skb, hdr_size))) - return NET_RX_DROP; + goto out; ethhdr = (struct ethhdr *)skb_mac_header(skb); /* packet with broadcast indication but unicast recipient */ if (!is_broadcast_ether_addr(ethhdr->h_dest)) - return NET_RX_DROP; + goto out; /* packet with broadcast sender address */ if (is_broadcast_ether_addr(ethhdr->h_source)) - return NET_RX_DROP; + goto out; /* ignore broadcasts sent by myself */ if (is_my_mac(ethhdr->h_source)) - return NET_RX_DROP; + goto out; bcast_packet = (struct bcast_packet *)skb->data; /* ignore broadcasts originated by myself */ if (is_my_mac(bcast_packet->orig)) - return NET_RX_DROP; + goto out; if (bcast_packet->ttl < 2) - return NET_RX_DROP; + goto out; - spin_lock_bh(&bat_priv->orig_hash_lock); - orig_node = ((struct orig_node *) - hash_find(bat_priv->orig_hash, compare_orig, choose_orig, - bcast_packet->orig)); + rcu_read_lock(); + orig_node = orig_hash_find(bat_priv, bcast_packet->orig); - if (!orig_node) { - spin_unlock_bh(&bat_priv->orig_hash_lock); - return NET_RX_DROP; - } + if (!orig_node) + goto rcu_unlock; + + rcu_read_unlock(); + + spin_lock_bh(&orig_node->bcast_seqno_lock); /* check whether the packet is a duplicate */ - if (get_bit_status(orig_node->bcast_bits, - orig_node->last_bcast_seqno, - ntohl(bcast_packet->seqno))) { - spin_unlock_bh(&bat_priv->orig_hash_lock); - return NET_RX_DROP; - } + if (get_bit_status(orig_node->bcast_bits, orig_node->last_bcast_seqno, + ntohl(bcast_packet->seqno))) + goto spin_unlock; seq_diff = ntohl(bcast_packet->seqno) - orig_node->last_bcast_seqno; /* check whether the packet is old and the host just restarted. */ if (window_protected(bat_priv, seq_diff, - &orig_node->bcast_seqno_reset)) { - spin_unlock_bh(&bat_priv->orig_hash_lock); - return NET_RX_DROP; - } + &orig_node->bcast_seqno_reset)) + goto spin_unlock; /* mark broadcast in flood history, update window position * if required. */ if (bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1)) orig_node->last_bcast_seqno = ntohl(bcast_packet->seqno); - spin_unlock_bh(&bat_priv->orig_hash_lock); + spin_unlock_bh(&orig_node->bcast_seqno_lock); + /* rebroadcast packet */ add_bcast_packet_to_list(bat_priv, skb); /* broadcast for me */ interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size); + ret = NET_RX_SUCCESS; + goto out; - return NET_RX_SUCCESS; +rcu_unlock: + rcu_read_unlock(); + goto out; +spin_unlock: + spin_unlock_bh(&orig_node->bcast_seqno_lock); +out: + if (orig_node) + orig_node_free_ref(orig_node); + return ret; } -int recv_vis_packet(struct sk_buff *skb, struct batman_if *recv_if) +int recv_vis_packet(struct sk_buff *skb, struct hard_iface *recv_if) { struct vis_packet *vis_packet; struct ethhdr *ethhdr; |