| // SPDX-License-Identifier: GPL-2.0 |
| /* Copyright (C) 2007-2018 B.A.T.M.A.N. contributors: |
| * |
| * Marek Lindner, Simon Wunderlich |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of version 2 of the GNU General Public |
| * License as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, but |
| * WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, see <http://www.gnu.org/licenses/>. |
| */ |
| |
| #include "bat_iv_ogm.h" |
| #include "main.h" |
| |
| #include <linux/atomic.h> |
| #include <linux/bitmap.h> |
| #include <linux/bitops.h> |
| #include <linux/bug.h> |
| #include <linux/byteorder/generic.h> |
| #include <linux/cache.h> |
| #include <linux/errno.h> |
| #include <linux/etherdevice.h> |
| #include <linux/gfp.h> |
| #include <linux/if_ether.h> |
| #include <linux/init.h> |
| #include <linux/jiffies.h> |
| #include <linux/kernel.h> |
| #include <linux/kref.h> |
| #include <linux/list.h> |
| #include <linux/lockdep.h> |
| #include <linux/netdevice.h> |
| #include <linux/netlink.h> |
| #include <linux/pkt_sched.h> |
| #include <linux/printk.h> |
| #include <linux/random.h> |
| #include <linux/rculist.h> |
| #include <linux/rcupdate.h> |
| #include <linux/seq_file.h> |
| #include <linux/skbuff.h> |
| #include <linux/slab.h> |
| #include <linux/spinlock.h> |
| #include <linux/stddef.h> |
| #include <linux/string.h> |
| #include <linux/types.h> |
| #include <linux/workqueue.h> |
| #include <net/genetlink.h> |
| #include <net/netlink.h> |
| #include <uapi/linux/batadv_packet.h> |
| #include <uapi/linux/batman_adv.h> |
| |
| #include "bat_algo.h" |
| #include "bitarray.h" |
| #include "gateway_client.h" |
| #include "hard-interface.h" |
| #include "hash.h" |
| #include "log.h" |
| #include "netlink.h" |
| #include "network-coding.h" |
| #include "originator.h" |
| #include "routing.h" |
| #include "send.h" |
| #include "translation-table.h" |
| #include "tvlv.h" |
| |
| static void batadv_iv_send_outstanding_bat_ogm_packet(struct work_struct *work); |
| |
| /** |
| * enum batadv_dup_status - duplicate status |
| */ |
| enum batadv_dup_status { |
| /** @BATADV_NO_DUP: the packet is no duplicate */ |
| BATADV_NO_DUP = 0, |
| |
| /** |
| * @BATADV_ORIG_DUP: OGM is a duplicate in the originator (but not for |
| * the neighbor) |
| */ |
| BATADV_ORIG_DUP, |
| |
| /** @BATADV_NEIGH_DUP: OGM is a duplicate for the neighbor */ |
| BATADV_NEIGH_DUP, |
| |
| /** |
| * @BATADV_PROTECTED: originator is currently protected (after reboot) |
| */ |
| BATADV_PROTECTED, |
| }; |
| |
| /** |
| * batadv_ring_buffer_set() - update the ring buffer with the given value |
| * @lq_recv: pointer to the ring buffer |
| * @lq_index: index to store the value at |
| * @value: value to store in the ring buffer |
| */ |
| static void batadv_ring_buffer_set(u8 lq_recv[], u8 *lq_index, u8 value) |
| { |
| lq_recv[*lq_index] = value; |
| *lq_index = (*lq_index + 1) % BATADV_TQ_GLOBAL_WINDOW_SIZE; |
| } |
| |
| /** |
| * batadv_ring_buffer_avg() - compute the average of all non-zero values stored |
| * in the given ring buffer |
| * @lq_recv: pointer to the ring buffer |
| * |
| * Return: computed average value. |
| */ |
| static u8 batadv_ring_buffer_avg(const u8 lq_recv[]) |
| { |
| const u8 *ptr; |
| u16 count = 0; |
| u16 i = 0; |
| u16 sum = 0; |
| |
| ptr = lq_recv; |
| |
| while (i < BATADV_TQ_GLOBAL_WINDOW_SIZE) { |
| if (*ptr != 0) { |
| count++; |
| sum += *ptr; |
| } |
| |
| i++; |
| ptr++; |
| } |
| |
| if (count == 0) |
| return 0; |
| |
| return (u8)(sum / count); |
| } |
| |
| /** |
| * 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 |
| * |
| * Return: 0 on success, a negative error code otherwise. |
| */ |
| static int batadv_iv_ogm_orig_add_if(struct batadv_orig_node *orig_node, |
| unsigned int max_if_num) |
| { |
| void *data_ptr; |
| size_t old_size; |
| int ret = -ENOMEM; |
| |
| spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock); |
| |
| old_size = (max_if_num - 1) * sizeof(unsigned long) * BATADV_NUM_WORDS; |
| data_ptr = kmalloc_array(max_if_num, |
| BATADV_NUM_WORDS * sizeof(unsigned long), |
| 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_array(max_if_num, sizeof(u8), GFP_ATOMIC); |
| if (!data_ptr) |
| goto unlock; |
| |
| memcpy(data_ptr, orig_node->bat_iv.bcast_own_sum, |
| (max_if_num - 1) * sizeof(u8)); |
| 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_drop_bcast_own_entry() - drop section of bcast_own |
| * @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 |
| */ |
| static void |
| batadv_iv_ogm_drop_bcast_own_entry(struct batadv_orig_node *orig_node, |
| unsigned int max_if_num, |
| unsigned int del_if_num) |
| { |
| size_t chunk_size; |
| size_t if_offset; |
| void *data_ptr; |
| |
| lockdep_assert_held(&orig_node->bat_iv.ogm_cnt_lock); |
| |
| chunk_size = sizeof(unsigned long) * BATADV_NUM_WORDS; |
| data_ptr = kmalloc_array(max_if_num, chunk_size, GFP_ATOMIC); |
| if (!data_ptr) |
| /* use old buffer when new one could not be allocated */ |
| data_ptr = orig_node->bat_iv.bcast_own; |
| |
| /* copy first part */ |
| memmove(data_ptr, orig_node->bat_iv.bcast_own, del_if_num * chunk_size); |
| |
| /* copy second part */ |
| if_offset = (del_if_num + 1) * chunk_size; |
| memmove((char *)data_ptr + del_if_num * chunk_size, |
| (uint8_t *)orig_node->bat_iv.bcast_own + if_offset, |
| (max_if_num - del_if_num) * chunk_size); |
| |
| /* bcast_own was shrunk down in new buffer; free old one */ |
| if (orig_node->bat_iv.bcast_own != data_ptr) { |
| kfree(orig_node->bat_iv.bcast_own); |
| orig_node->bat_iv.bcast_own = data_ptr; |
| } |
| } |
| |
| /** |
| * batadv_iv_ogm_drop_bcast_own_sum_entry() - drop section of bcast_own_sum |
| * @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 |
| */ |
| static void |
| batadv_iv_ogm_drop_bcast_own_sum_entry(struct batadv_orig_node *orig_node, |
| unsigned int max_if_num, |
| unsigned int del_if_num) |
| { |
| size_t if_offset; |
| void *data_ptr; |
| |
| lockdep_assert_held(&orig_node->bat_iv.ogm_cnt_lock); |
| |
| data_ptr = kmalloc_array(max_if_num, sizeof(u8), GFP_ATOMIC); |
| if (!data_ptr) |
| /* use old buffer when new one could not be allocated */ |
| data_ptr = orig_node->bat_iv.bcast_own_sum; |
| |
| memmove(data_ptr, orig_node->bat_iv.bcast_own_sum, |
| del_if_num * sizeof(u8)); |
| |
| if_offset = (del_if_num + 1) * sizeof(u8); |
| memmove((char *)data_ptr + del_if_num * sizeof(u8), |
| orig_node->bat_iv.bcast_own_sum + if_offset, |
| (max_if_num - del_if_num) * sizeof(u8)); |
| |
| /* bcast_own_sum was shrunk down in new buffer; free old one */ |
| if (orig_node->bat_iv.bcast_own_sum != data_ptr) { |
| kfree(orig_node->bat_iv.bcast_own_sum); |
| orig_node->bat_iv.bcast_own_sum = data_ptr; |
| } |
| } |
| |
| /** |
| * 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 |
| * |
| * Return: 0 on success, a negative error code otherwise. |
| */ |
| static int batadv_iv_ogm_orig_del_if(struct batadv_orig_node *orig_node, |
| unsigned int max_if_num, |
| unsigned int del_if_num) |
| { |
| spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock); |
| |
| if (max_if_num == 0) { |
| kfree(orig_node->bat_iv.bcast_own); |
| kfree(orig_node->bat_iv.bcast_own_sum); |
| orig_node->bat_iv.bcast_own = NULL; |
| orig_node->bat_iv.bcast_own_sum = NULL; |
| } else { |
| batadv_iv_ogm_drop_bcast_own_entry(orig_node, max_if_num, |
| del_if_num); |
| batadv_iv_ogm_drop_bcast_own_sum_entry(orig_node, max_if_num, |
| del_if_num); |
| } |
| |
| spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock); |
| |
| return 0; |
| } |
| |
| /** |
| * 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 |
| * |
| * Return: 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 u8 *addr) |
| { |
| struct batadv_orig_node *orig_node; |
| int hash_added; |
| size_t size; |
| |
| 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(u8); |
| orig_node->bat_iv.bcast_own_sum = kzalloc(size, GFP_ATOMIC); |
| if (!orig_node->bat_iv.bcast_own_sum) |
| goto free_orig_node; |
| |
| kref_get(&orig_node->refcount); |
| 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_orig_node_hash; |
| |
| return orig_node; |
| |
| free_orig_node_hash: |
| batadv_orig_node_put(orig_node); |
| free_orig_node: |
| batadv_orig_node_put(orig_node); |
| |
| return NULL; |
| } |
| |
| static struct batadv_neigh_node * |
| batadv_iv_ogm_neigh_new(struct batadv_hard_iface *hard_iface, |
| const u8 *neigh_addr, |
| struct batadv_orig_node *orig_node, |
| struct batadv_orig_node *orig_neigh) |
| { |
| struct batadv_neigh_node *neigh_node; |
| |
| neigh_node = batadv_neigh_node_get_or_create(orig_node, |
| hard_iface, neigh_addr); |
| if (!neigh_node) |
| goto out; |
| |
| neigh_node->orig_node = orig_neigh; |
| |
| out: |
| return neigh_node; |
| } |
| |
| static int batadv_iv_ogm_iface_enable(struct batadv_hard_iface *hard_iface) |
| { |
| struct batadv_ogm_packet *batadv_ogm_packet; |
| unsigned char *ogm_buff; |
| u32 random_seqno; |
| |
| /* randomize initial seqno to avoid collision */ |
| get_random_bytes(&random_seqno, sizeof(random_seqno)); |
| atomic_set(&hard_iface->bat_iv.ogm_seqno, random_seqno); |
| |
| hard_iface->bat_iv.ogm_buff_len = BATADV_OGM_HLEN; |
| ogm_buff = kmalloc(hard_iface->bat_iv.ogm_buff_len, GFP_ATOMIC); |
| if (!ogm_buff) |
| return -ENOMEM; |
| |
| hard_iface->bat_iv.ogm_buff = ogm_buff; |
| |
| batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff; |
| batadv_ogm_packet->packet_type = BATADV_IV_OGM; |
| batadv_ogm_packet->version = BATADV_COMPAT_VERSION; |
| batadv_ogm_packet->ttl = 2; |
| batadv_ogm_packet->flags = BATADV_NO_FLAGS; |
| batadv_ogm_packet->reserved = 0; |
| batadv_ogm_packet->tq = BATADV_TQ_MAX_VALUE; |
| |
| return 0; |
| } |
| |
| static void batadv_iv_ogm_iface_disable(struct batadv_hard_iface *hard_iface) |
| { |
| kfree(hard_iface->bat_iv.ogm_buff); |
| hard_iface->bat_iv.ogm_buff = NULL; |
| } |
| |
| static void batadv_iv_ogm_iface_update_mac(struct batadv_hard_iface *hard_iface) |
| { |
| struct batadv_ogm_packet *batadv_ogm_packet; |
| unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff; |
| |
| batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff; |
| ether_addr_copy(batadv_ogm_packet->orig, |
| hard_iface->net_dev->dev_addr); |
| ether_addr_copy(batadv_ogm_packet->prev_sender, |
| hard_iface->net_dev->dev_addr); |
| } |
| |
| static void |
| batadv_iv_ogm_primary_iface_set(struct batadv_hard_iface *hard_iface) |
| { |
| struct batadv_ogm_packet *batadv_ogm_packet; |
| unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff; |
| |
| batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff; |
| batadv_ogm_packet->ttl = BATADV_TTL; |
| } |
| |
| /* when do we schedule our own ogm to be sent */ |
| static unsigned long |
| batadv_iv_ogm_emit_send_time(const struct batadv_priv *bat_priv) |
| { |
| unsigned int msecs; |
| |
| msecs = atomic_read(&bat_priv->orig_interval) - BATADV_JITTER; |
| msecs += prandom_u32() % (2 * BATADV_JITTER); |
| |
| return jiffies + msecs_to_jiffies(msecs); |
| } |
| |
| /* when do we schedule a ogm packet to be sent */ |
| static unsigned long batadv_iv_ogm_fwd_send_time(void) |
| { |
| return jiffies + msecs_to_jiffies(prandom_u32() % (BATADV_JITTER / 2)); |
| } |
| |
| /* apply hop penalty for a normal link */ |
| static u8 batadv_hop_penalty(u8 tq, const struct batadv_priv *bat_priv) |
| { |
| int hop_penalty = atomic_read(&bat_priv->hop_penalty); |
| int new_tq; |
| |
| new_tq = tq * (BATADV_TQ_MAX_VALUE - hop_penalty); |
| new_tq /= BATADV_TQ_MAX_VALUE; |
| |
| return new_tq; |
| } |
| |
| /** |
| * batadv_iv_ogm_aggr_packet() - checks if there is another OGM attached |
| * @buff_pos: current position in the skb |
| * @packet_len: total length of the skb |
| * @tvlv_len: tvlv length of the previously considered OGM |
| * |
| * Return: true if there is enough space for another OGM, false otherwise. |
| */ |
| static bool batadv_iv_ogm_aggr_packet(int buff_pos, int packet_len, |
| __be16 tvlv_len) |
| { |
| int next_buff_pos = 0; |
| |
| next_buff_pos += buff_pos + BATADV_OGM_HLEN; |
| next_buff_pos += ntohs(tvlv_len); |
| |
| return (next_buff_pos <= packet_len) && |
| (next_buff_pos <= BATADV_MAX_AGGREGATION_BYTES); |
| } |
| |
| /* send a batman ogm to a given interface */ |
| static void batadv_iv_ogm_send_to_if(struct batadv_forw_packet *forw_packet, |
| struct batadv_hard_iface *hard_iface) |
| { |
| struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
| const char *fwd_str; |
| u8 packet_num; |
| s16 buff_pos; |
| struct batadv_ogm_packet *batadv_ogm_packet; |
| struct sk_buff *skb; |
| u8 *packet_pos; |
| |
| if (hard_iface->if_status != BATADV_IF_ACTIVE) |
| return; |
| |
| packet_num = 0; |
| buff_pos = 0; |
| packet_pos = forw_packet->skb->data; |
| batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos; |
| |
| /* adjust all flags and log packets */ |
| while (batadv_iv_ogm_aggr_packet(buff_pos, forw_packet->packet_len, |
| batadv_ogm_packet->tvlv_len)) { |
| /* we might have aggregated direct link packets with an |
| * ordinary base packet |
| */ |
| if (forw_packet->direct_link_flags & BIT(packet_num) && |
| forw_packet->if_incoming == hard_iface) |
| batadv_ogm_packet->flags |= BATADV_DIRECTLINK; |
| else |
| batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK; |
| |
| if (packet_num > 0 || !forw_packet->own) |
| fwd_str = "Forwarding"; |
| else |
| fwd_str = "Sending own"; |
| |
| batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| "%s %spacket (originator %pM, seqno %u, TQ %d, TTL %d, IDF %s) on interface %s [%pM]\n", |
| fwd_str, (packet_num > 0 ? "aggregated " : ""), |
| batadv_ogm_packet->orig, |
| ntohl(batadv_ogm_packet->seqno), |
| batadv_ogm_packet->tq, batadv_ogm_packet->ttl, |
| ((batadv_ogm_packet->flags & BATADV_DIRECTLINK) ? |
| "on" : "off"), |
| hard_iface->net_dev->name, |
| hard_iface->net_dev->dev_addr); |
| |
| buff_pos += BATADV_OGM_HLEN; |
| buff_pos += ntohs(batadv_ogm_packet->tvlv_len); |
| packet_num++; |
| packet_pos = forw_packet->skb->data + buff_pos; |
| batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos; |
| } |
| |
| /* create clone because function is called more than once */ |
| skb = skb_clone(forw_packet->skb, GFP_ATOMIC); |
| if (skb) { |
| batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_TX); |
| batadv_add_counter(bat_priv, BATADV_CNT_MGMT_TX_BYTES, |
| skb->len + ETH_HLEN); |
| batadv_send_broadcast_skb(skb, hard_iface); |
| } |
| } |
| |
| /* send a batman ogm packet */ |
| static void batadv_iv_ogm_emit(struct batadv_forw_packet *forw_packet) |
| { |
| struct net_device *soft_iface; |
| |
| if (!forw_packet->if_incoming) { |
| pr_err("Error - can't forward packet: incoming iface not specified\n"); |
| return; |
| } |
| |
| soft_iface = forw_packet->if_incoming->soft_iface; |
| |
| if (WARN_ON(!forw_packet->if_outgoing)) |
| return; |
| |
| if (WARN_ON(forw_packet->if_outgoing->soft_iface != soft_iface)) |
| return; |
| |
| if (forw_packet->if_incoming->if_status != BATADV_IF_ACTIVE) |
| return; |
| |
| /* only for one specific outgoing interface */ |
| batadv_iv_ogm_send_to_if(forw_packet, forw_packet->if_outgoing); |
| } |
| |
| /** |
| * batadv_iv_ogm_can_aggregate() - find out if an OGM can be aggregated on an |
| * existing forward packet |
| * @new_bat_ogm_packet: OGM packet to be aggregated |
| * @bat_priv: the bat priv with all the soft interface information |
| * @packet_len: (total) length of the OGM |
| * @send_time: timestamp (jiffies) when the packet is to be sent |
| * @directlink: true if this is a direct link packet |
| * @if_incoming: interface where the packet was received |
| * @if_outgoing: interface for which the retransmission should be considered |
| * @forw_packet: the forwarded packet which should be checked |
| * |
| * Return: true if new_packet can be aggregated with forw_packet |
| */ |
| static bool |
| batadv_iv_ogm_can_aggregate(const struct batadv_ogm_packet *new_bat_ogm_packet, |
| struct batadv_priv *bat_priv, |
| int packet_len, unsigned long send_time, |
| bool directlink, |
| const struct batadv_hard_iface *if_incoming, |
| const struct batadv_hard_iface *if_outgoing, |
| const struct batadv_forw_packet *forw_packet) |
| { |
| struct batadv_ogm_packet *batadv_ogm_packet; |
| int aggregated_bytes = forw_packet->packet_len + packet_len; |
| struct batadv_hard_iface *primary_if = NULL; |
| bool res = false; |
| unsigned long aggregation_end_time; |
| |
| batadv_ogm_packet = (struct batadv_ogm_packet *)forw_packet->skb->data; |
| aggregation_end_time = send_time; |
| aggregation_end_time += msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS); |
| |
| /* we can aggregate the current packet to this aggregated packet |
| * if: |
| * |
| * - the send time is within our MAX_AGGREGATION_MS time |
| * - the resulting packet wont be bigger than |
| * MAX_AGGREGATION_BYTES |
| * otherwise aggregation is not possible |
| */ |
| if (!time_before(send_time, forw_packet->send_time) || |
| !time_after_eq(aggregation_end_time, forw_packet->send_time)) |
| return false; |
| |
| if (aggregated_bytes > BATADV_MAX_AGGREGATION_BYTES) |
| return false; |
| |
| /* packet is not leaving on the same interface. */ |
| if (forw_packet->if_outgoing != if_outgoing) |
| return false; |
| |
| /* check aggregation compatibility |
| * -> direct link packets are broadcasted on |
| * their interface only |
| * -> aggregate packet if the current packet is |
| * a "global" packet as well as the base |
| * packet |
| */ |
| primary_if = batadv_primary_if_get_selected(bat_priv); |
| if (!primary_if) |
| return false; |
| |
| /* packets without direct link flag and high TTL |
| * are flooded through the net |
| */ |
| if (!directlink && |
| !(batadv_ogm_packet->flags & BATADV_DIRECTLINK) && |
| batadv_ogm_packet->ttl != 1 && |
| |
| /* own packets originating non-primary |
| * interfaces leave only that interface |
| */ |
| (!forw_packet->own || |
| forw_packet->if_incoming == primary_if)) { |
| res = true; |
| goto out; |
| } |
| |
| /* if the incoming packet is sent via this one |
| * interface only - we still can aggregate |
| */ |
| if (directlink && |
| new_bat_ogm_packet->ttl == 1 && |
| forw_packet->if_incoming == if_incoming && |
| |
| /* packets from direct neighbors or |
| * own secondary interface packets |
| * (= secondary interface packets in general) |
| */ |
| (batadv_ogm_packet->flags & BATADV_DIRECTLINK || |
| (forw_packet->own && |
| forw_packet->if_incoming != primary_if))) { |
| res = true; |
| goto out; |
| } |
| |
| out: |
| if (primary_if) |
| batadv_hardif_put(primary_if); |
| return res; |
| } |
| |
| /** |
| * batadv_iv_ogm_aggregate_new() - create a new aggregated packet and add this |
| * packet to it. |
| * @packet_buff: pointer to the OGM |
| * @packet_len: (total) length of the OGM |
| * @send_time: timestamp (jiffies) when the packet is to be sent |
| * @direct_link: whether this OGM has direct link status |
| * @if_incoming: interface where the packet was received |
| * @if_outgoing: interface for which the retransmission should be considered |
| * @own_packet: true if it is a self-generated ogm |
| */ |
| static void batadv_iv_ogm_aggregate_new(const unsigned char *packet_buff, |
| int packet_len, unsigned long send_time, |
| bool direct_link, |
| struct batadv_hard_iface *if_incoming, |
| struct batadv_hard_iface *if_outgoing, |
| int own_packet) |
| { |
| struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
| struct batadv_forw_packet *forw_packet_aggr; |
| struct sk_buff *skb; |
| unsigned char *skb_buff; |
| unsigned int skb_size; |
| atomic_t *queue_left = own_packet ? NULL : &bat_priv->batman_queue_left; |
| |
| if (atomic_read(&bat_priv->aggregated_ogms) && |
| packet_len < BATADV_MAX_AGGREGATION_BYTES) |
| skb_size = BATADV_MAX_AGGREGATION_BYTES; |
| else |
| skb_size = packet_len; |
| |
| skb_size += ETH_HLEN; |
| |
| skb = netdev_alloc_skb_ip_align(NULL, skb_size); |
| if (!skb) |
| return; |
| |
| forw_packet_aggr = batadv_forw_packet_alloc(if_incoming, if_outgoing, |
| queue_left, bat_priv, skb); |
| if (!forw_packet_aggr) { |
| kfree_skb(skb); |
| return; |
| } |
| |
| forw_packet_aggr->skb->priority = TC_PRIO_CONTROL; |
| skb_reserve(forw_packet_aggr->skb, ETH_HLEN); |
| |
| skb_buff = skb_put(forw_packet_aggr->skb, packet_len); |
| forw_packet_aggr->packet_len = packet_len; |
| memcpy(skb_buff, packet_buff, packet_len); |
| |
| forw_packet_aggr->own = own_packet; |
| forw_packet_aggr->direct_link_flags = BATADV_NO_FLAGS; |
| forw_packet_aggr->send_time = send_time; |
| |
| /* save packet direct link flag status */ |
| if (direct_link) |
| forw_packet_aggr->direct_link_flags |= 1; |
| |
| INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work, |
| batadv_iv_send_outstanding_bat_ogm_packet); |
| |
| batadv_forw_packet_ogmv1_queue(bat_priv, forw_packet_aggr, send_time); |
| } |
| |
| /* aggregate a new packet into the existing ogm packet */ |
| static void batadv_iv_ogm_aggregate(struct batadv_forw_packet *forw_packet_aggr, |
| const unsigned char *packet_buff, |
| int packet_len, bool direct_link) |
| { |
| unsigned long new_direct_link_flag; |
| |
| skb_put_data(forw_packet_aggr->skb, packet_buff, packet_len); |
| forw_packet_aggr->packet_len += packet_len; |
| forw_packet_aggr->num_packets++; |
| |
| /* save packet direct link flag status */ |
| if (direct_link) { |
| new_direct_link_flag = BIT(forw_packet_aggr->num_packets); |
| forw_packet_aggr->direct_link_flags |= new_direct_link_flag; |
| } |
| } |
| |
| /** |
| * batadv_iv_ogm_queue_add() - queue up an OGM for transmission |
| * @bat_priv: the bat priv with all the soft interface information |
| * @packet_buff: pointer to the OGM |
| * @packet_len: (total) length of the OGM |
| * @if_incoming: interface where the packet was received |
| * @if_outgoing: interface for which the retransmission should be considered |
| * @own_packet: true if it is a self-generated ogm |
| * @send_time: timestamp (jiffies) when the packet is to be sent |
| */ |
| static void batadv_iv_ogm_queue_add(struct batadv_priv *bat_priv, |
| unsigned char *packet_buff, |
| int packet_len, |
| struct batadv_hard_iface *if_incoming, |
| struct batadv_hard_iface *if_outgoing, |
| int own_packet, unsigned long send_time) |
| { |
| /* _aggr -> pointer to the packet we want to aggregate with |
| * _pos -> pointer to the position in the queue |
| */ |
| struct batadv_forw_packet *forw_packet_aggr = NULL; |
| struct batadv_forw_packet *forw_packet_pos = NULL; |
| struct batadv_ogm_packet *batadv_ogm_packet; |
| bool direct_link; |
| unsigned long max_aggregation_jiffies; |
| |
| batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff; |
| direct_link = !!(batadv_ogm_packet->flags & BATADV_DIRECTLINK); |
| max_aggregation_jiffies = msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS); |
| |
| /* find position for the packet in the forward queue */ |
| spin_lock_bh(&bat_priv->forw_bat_list_lock); |
| /* own packets are not to be aggregated */ |
| if (atomic_read(&bat_priv->aggregated_ogms) && !own_packet) { |
| hlist_for_each_entry(forw_packet_pos, |
| &bat_priv->forw_bat_list, list) { |
| if (batadv_iv_ogm_can_aggregate(batadv_ogm_packet, |
| bat_priv, packet_len, |
| send_time, direct_link, |
| if_incoming, |
| if_outgoing, |
| forw_packet_pos)) { |
| forw_packet_aggr = forw_packet_pos; |
| break; |
| } |
| } |
| } |
| |
| /* nothing to aggregate with - either aggregation disabled or no |
| * suitable aggregation packet found |
| */ |
| if (!forw_packet_aggr) { |
| /* the following section can run without the lock */ |
| spin_unlock_bh(&bat_priv->forw_bat_list_lock); |
| |
| /* if we could not aggregate this packet with one of the others |
| * we hold it back for a while, so that it might be aggregated |
| * later on |
| */ |
| if (!own_packet && atomic_read(&bat_priv->aggregated_ogms)) |
| send_time += max_aggregation_jiffies; |
| |
| batadv_iv_ogm_aggregate_new(packet_buff, packet_len, |
| send_time, direct_link, |
| if_incoming, if_outgoing, |
| own_packet); |
| } else { |
| batadv_iv_ogm_aggregate(forw_packet_aggr, packet_buff, |
| packet_len, direct_link); |
| spin_unlock_bh(&bat_priv->forw_bat_list_lock); |
| } |
| } |
| |
| static void batadv_iv_ogm_forward(struct batadv_orig_node *orig_node, |
| const struct ethhdr *ethhdr, |
| struct batadv_ogm_packet *batadv_ogm_packet, |
| bool is_single_hop_neigh, |
| bool is_from_best_next_hop, |
| struct batadv_hard_iface *if_incoming, |
| struct batadv_hard_iface *if_outgoing) |
| { |
| struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
| u16 tvlv_len; |
| |
| if (batadv_ogm_packet->ttl <= 1) { |
| batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "ttl exceeded\n"); |
| return; |
| } |
| |
| if (!is_from_best_next_hop) { |
| /* Mark the forwarded packet when it is not coming from our |
| * best next hop. We still need to forward the packet for our |
| * neighbor link quality detection to work in case the packet |
| * originated from a single hop neighbor. Otherwise we can |
| * simply drop the ogm. |
| */ |
| if (is_single_hop_neigh) |
| batadv_ogm_packet->flags |= BATADV_NOT_BEST_NEXT_HOP; |
| else |
| return; |
| } |
| |
| tvlv_len = ntohs(batadv_ogm_packet->tvlv_len); |
| |
| batadv_ogm_packet->ttl--; |
| ether_addr_copy(batadv_ogm_packet->prev_sender, ethhdr->h_source); |
| |
| /* apply hop penalty */ |
| batadv_ogm_packet->tq = batadv_hop_penalty(batadv_ogm_packet->tq, |
| bat_priv); |
| |
| batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| "Forwarding packet: tq: %i, ttl: %i\n", |
| batadv_ogm_packet->tq, batadv_ogm_packet->ttl); |
| |
| if (is_single_hop_neigh) |
| batadv_ogm_packet->flags |= BATADV_DIRECTLINK; |
| else |
| batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK; |
| |
| batadv_iv_ogm_queue_add(bat_priv, (unsigned char *)batadv_ogm_packet, |
| BATADV_OGM_HLEN + tvlv_len, |
| if_incoming, if_outgoing, 0, |
| batadv_iv_ogm_fwd_send_time()); |
| } |
| |
| /** |
| * batadv_iv_ogm_slide_own_bcast_window() - bitshift own OGM broadcast windows |
| * for the given interface |
| * @hard_iface: the interface for which the windows have to be shifted |
| */ |
| static void |
| batadv_iv_ogm_slide_own_bcast_window(struct batadv_hard_iface *hard_iface) |
| { |
| struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
| struct batadv_hashtable *hash = bat_priv->orig_hash; |
| struct hlist_head *head; |
| struct batadv_orig_node *orig_node; |
| unsigned long *word; |
| u32 i; |
| size_t word_index; |
| u8 *w; |
| unsigned 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->bat_iv.ogm_cnt_lock); |
| word_index = hard_iface->if_num * BATADV_NUM_WORDS; |
| word = &orig_node->bat_iv.bcast_own[word_index]; |
| |
| batadv_bit_get_packet(bat_priv, word, 1, 0); |
| 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->bat_iv.ogm_cnt_lock); |
| } |
| rcu_read_unlock(); |
| } |
| } |
| |
| static void batadv_iv_ogm_schedule(struct batadv_hard_iface *hard_iface) |
| { |
| struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
| unsigned char **ogm_buff = &hard_iface->bat_iv.ogm_buff; |
| struct batadv_ogm_packet *batadv_ogm_packet; |
| struct batadv_hard_iface *primary_if, *tmp_hard_iface; |
| int *ogm_buff_len = &hard_iface->bat_iv.ogm_buff_len; |
| u32 seqno; |
| u16 tvlv_len = 0; |
| unsigned long send_time; |
| |
| if (hard_iface->if_status == BATADV_IF_NOT_IN_USE || |
| hard_iface->if_status == BATADV_IF_TO_BE_REMOVED) |
| return; |
| |
| /* the interface gets activated here to avoid race conditions between |
| * the moment of activating the interface in |
| * hardif_activate_interface() where the originator mac is set and |
| * outdated packets (especially uninitialized mac addresses) in the |
| * packet queue |
| */ |
| if (hard_iface->if_status == BATADV_IF_TO_BE_ACTIVATED) |
| hard_iface->if_status = BATADV_IF_ACTIVE; |
| |
| primary_if = batadv_primary_if_get_selected(bat_priv); |
| |
| if (hard_iface == primary_if) { |
| /* tt changes have to be committed before the tvlv data is |
| * appended as it may alter the tt tvlv container |
| */ |
| batadv_tt_local_commit_changes(bat_priv); |
| tvlv_len = batadv_tvlv_container_ogm_append(bat_priv, ogm_buff, |
| ogm_buff_len, |
| BATADV_OGM_HLEN); |
| } |
| |
| batadv_ogm_packet = (struct batadv_ogm_packet *)(*ogm_buff); |
| batadv_ogm_packet->tvlv_len = htons(tvlv_len); |
| |
| /* change sequence number to network order */ |
| seqno = (u32)atomic_read(&hard_iface->bat_iv.ogm_seqno); |
| batadv_ogm_packet->seqno = htonl(seqno); |
| atomic_inc(&hard_iface->bat_iv.ogm_seqno); |
| |
| batadv_iv_ogm_slide_own_bcast_window(hard_iface); |
| |
| send_time = batadv_iv_ogm_emit_send_time(bat_priv); |
| |
| if (hard_iface != primary_if) { |
| /* OGMs from secondary interfaces are only scheduled on their |
| * respective interfaces. |
| */ |
| batadv_iv_ogm_queue_add(bat_priv, *ogm_buff, *ogm_buff_len, |
| hard_iface, hard_iface, 1, send_time); |
| goto out; |
| } |
| |
| /* OGMs from primary interfaces are scheduled on all |
| * interfaces. |
| */ |
| rcu_read_lock(); |
| list_for_each_entry_rcu(tmp_hard_iface, &batadv_hardif_list, list) { |
| if (tmp_hard_iface->soft_iface != hard_iface->soft_iface) |
| continue; |
| |
| if (!kref_get_unless_zero(&tmp_hard_iface->refcount)) |
| continue; |
| |
| batadv_iv_ogm_queue_add(bat_priv, *ogm_buff, |
| *ogm_buff_len, hard_iface, |
| tmp_hard_iface, 1, send_time); |
| |
| batadv_hardif_put(tmp_hard_iface); |
| } |
| rcu_read_unlock(); |
| |
| out: |
| if (primary_if) |
| batadv_hardif_put(primary_if); |
| } |
| |
| /** |
| * batadv_iv_ogm_orig_update() - use OGM to update corresponding data in an |
| * originator |
| * @bat_priv: the bat priv with all the soft interface information |
| * @orig_node: the orig node who originally emitted the ogm packet |
| * @orig_ifinfo: ifinfo for the outgoing interface of the orig_node |
| * @ethhdr: Ethernet header of the OGM |
| * @batadv_ogm_packet: the ogm packet |
| * @if_incoming: interface where the packet was received |
| * @if_outgoing: interface for which the retransmission should be considered |
| * @dup_status: the duplicate status of this ogm packet. |
| */ |
| static void |
| batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv, |
| struct batadv_orig_node *orig_node, |
| struct batadv_orig_ifinfo *orig_ifinfo, |
| const struct ethhdr *ethhdr, |
| const struct batadv_ogm_packet *batadv_ogm_packet, |
| struct batadv_hard_iface *if_incoming, |
| struct batadv_hard_iface *if_outgoing, |
| enum batadv_dup_status dup_status) |
| { |
| struct batadv_neigh_ifinfo *neigh_ifinfo = NULL; |
| struct batadv_neigh_ifinfo *router_ifinfo = NULL; |
| struct batadv_neigh_node *neigh_node = NULL; |
| struct batadv_neigh_node *tmp_neigh_node = NULL; |
| struct batadv_neigh_node *router = NULL; |
| struct batadv_orig_node *orig_node_tmp; |
| unsigned int if_num; |
| u8 sum_orig, sum_neigh; |
| u8 *neigh_addr; |
| u8 tq_avg; |
| |
| batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| "%s(): Searching and updating originator entry of received packet\n", |
| __func__); |
| |
| rcu_read_lock(); |
| hlist_for_each_entry_rcu(tmp_neigh_node, |
| &orig_node->neigh_list, list) { |
| neigh_addr = tmp_neigh_node->addr; |
| if (batadv_compare_eth(neigh_addr, ethhdr->h_source) && |
| tmp_neigh_node->if_incoming == if_incoming && |
| kref_get_unless_zero(&tmp_neigh_node->refcount)) { |
| if (WARN(neigh_node, "too many matching neigh_nodes")) |
| batadv_neigh_node_put(neigh_node); |
| neigh_node = tmp_neigh_node; |
| continue; |
| } |
| |
| if (dup_status != BATADV_NO_DUP) |
| continue; |
| |
| /* only update the entry for this outgoing interface */ |
| neigh_ifinfo = batadv_neigh_ifinfo_get(tmp_neigh_node, |
| if_outgoing); |
| if (!neigh_ifinfo) |
| continue; |
| |
| spin_lock_bh(&tmp_neigh_node->ifinfo_lock); |
| batadv_ring_buffer_set(neigh_ifinfo->bat_iv.tq_recv, |
| &neigh_ifinfo->bat_iv.tq_index, 0); |
| tq_avg = batadv_ring_buffer_avg(neigh_ifinfo->bat_iv.tq_recv); |
| neigh_ifinfo->bat_iv.tq_avg = tq_avg; |
| spin_unlock_bh(&tmp_neigh_node->ifinfo_lock); |
| |
| batadv_neigh_ifinfo_put(neigh_ifinfo); |
| neigh_ifinfo = NULL; |
| } |
| |
| if (!neigh_node) { |
| struct batadv_orig_node *orig_tmp; |
| |
| orig_tmp = batadv_iv_ogm_orig_get(bat_priv, ethhdr->h_source); |
| if (!orig_tmp) |
| goto unlock; |
| |
| neigh_node = batadv_iv_ogm_neigh_new(if_incoming, |
| ethhdr->h_source, |
| orig_node, orig_tmp); |
| |
| batadv_orig_node_put(orig_tmp); |
| if (!neigh_node) |
| goto unlock; |
| } else { |
| batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| "Updating existing last-hop neighbor of originator\n"); |
| } |
| |
| rcu_read_unlock(); |
| neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing); |
| if (!neigh_ifinfo) |
| goto out; |
| |
| neigh_node->last_seen = jiffies; |
| |
| spin_lock_bh(&neigh_node->ifinfo_lock); |
| batadv_ring_buffer_set(neigh_ifinfo->bat_iv.tq_recv, |
| &neigh_ifinfo->bat_iv.tq_index, |
| batadv_ogm_packet->tq); |
| tq_avg = batadv_ring_buffer_avg(neigh_ifinfo->bat_iv.tq_recv); |
| neigh_ifinfo->bat_iv.tq_avg = tq_avg; |
| spin_unlock_bh(&neigh_node->ifinfo_lock); |
| |
| if (dup_status == BATADV_NO_DUP) { |
| orig_ifinfo->last_ttl = batadv_ogm_packet->ttl; |
| neigh_ifinfo->last_ttl = batadv_ogm_packet->ttl; |
| } |
| |
| /* if this neighbor already is our next hop there is nothing |
| * to change |
| */ |
| router = batadv_orig_router_get(orig_node, if_outgoing); |
| if (router == neigh_node) |
| goto out; |
| |
| if (router) { |
| router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing); |
| if (!router_ifinfo) |
| goto out; |
| |
| /* if this neighbor does not offer a better TQ we won't |
| * consider it |
| */ |
| if (router_ifinfo->bat_iv.tq_avg > neigh_ifinfo->bat_iv.tq_avg) |
| goto out; |
| } |
| |
| /* if the TQ is the same and the link not more symmetric we |
| * won't consider it either |
| */ |
| if (router_ifinfo && |
| neigh_ifinfo->bat_iv.tq_avg == router_ifinfo->bat_iv.tq_avg) { |
| orig_node_tmp = router->orig_node; |
| spin_lock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock); |
| if_num = router->if_incoming->if_num; |
| 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->bat_iv.ogm_cnt_lock); |
| if_num = neigh_node->if_incoming->if_num; |
| 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; |
| } |
| |
| batadv_update_route(bat_priv, orig_node, if_outgoing, neigh_node); |
| goto out; |
| |
| unlock: |
| rcu_read_unlock(); |
| out: |
| if (neigh_node) |
| batadv_neigh_node_put(neigh_node); |
| if (router) |
| batadv_neigh_node_put(router); |
| if (neigh_ifinfo) |
| batadv_neigh_ifinfo_put(neigh_ifinfo); |
| if (router_ifinfo) |
| batadv_neigh_ifinfo_put(router_ifinfo); |
| } |
| |
| /** |
| * batadv_iv_ogm_calc_tq() - calculate tq for current received ogm packet |
| * @orig_node: the orig node who originally emitted the ogm packet |
| * @orig_neigh_node: the orig node struct of the neighbor who sent the packet |
| * @batadv_ogm_packet: the ogm packet |
| * @if_incoming: interface where the packet was received |
| * @if_outgoing: interface for which the retransmission should be considered |
| * |
| * Return: true if the link can be considered bidirectional, false otherwise |
| */ |
| static bool batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node, |
| struct batadv_orig_node *orig_neigh_node, |
| struct batadv_ogm_packet *batadv_ogm_packet, |
| struct batadv_hard_iface *if_incoming, |
| struct batadv_hard_iface *if_outgoing) |
| { |
| struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
| struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node; |
| struct batadv_neigh_ifinfo *neigh_ifinfo; |
| u8 total_count; |
| u8 orig_eq_count, neigh_rq_count, neigh_rq_inv, tq_own; |
| unsigned int neigh_rq_inv_cube, neigh_rq_max_cube; |
| unsigned int if_num; |
| unsigned int tq_asym_penalty, inv_asym_penalty; |
| unsigned int combined_tq; |
| unsigned int tq_iface_penalty; |
| bool ret = false; |
| |
| /* find corresponding one hop neighbor */ |
| rcu_read_lock(); |
| hlist_for_each_entry_rcu(tmp_neigh_node, |
| &orig_neigh_node->neigh_list, list) { |
| if (!batadv_compare_eth(tmp_neigh_node->addr, |
| orig_neigh_node->orig)) |
| continue; |
| |
| if (tmp_neigh_node->if_incoming != if_incoming) |
| continue; |
| |
| if (!kref_get_unless_zero(&tmp_neigh_node->refcount)) |
| continue; |
| |
| neigh_node = tmp_neigh_node; |
| break; |
| } |
| rcu_read_unlock(); |
| |
| if (!neigh_node) |
| neigh_node = batadv_iv_ogm_neigh_new(if_incoming, |
| orig_neigh_node->orig, |
| orig_neigh_node, |
| orig_neigh_node); |
| |
| if (!neigh_node) |
| goto out; |
| |
| /* if orig_node is direct neighbor update neigh_node last_seen */ |
| if (orig_node == orig_neigh_node) |
| neigh_node->last_seen = jiffies; |
| |
| orig_node->last_seen = jiffies; |
| |
| /* find packet count of corresponding one hop neighbor */ |
| spin_lock_bh(&orig_neigh_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_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing); |
| if (neigh_ifinfo) { |
| neigh_rq_count = neigh_ifinfo->bat_iv.real_packet_count; |
| batadv_neigh_ifinfo_put(neigh_ifinfo); |
| } else { |
| neigh_rq_count = 0; |
| } |
| spin_unlock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock); |
| |
| /* pay attention to not get a value bigger than 100 % */ |
| if (orig_eq_count > neigh_rq_count) |
| total_count = neigh_rq_count; |
| else |
| total_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 < BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM || |
| neigh_rq_count < BATADV_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 |
| */ |
| tq_own = (BATADV_TQ_MAX_VALUE * total_count) / neigh_rq_count; |
| |
| /* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does |
| * affect the nearly-symmetric links only a little, but |
| * punishes asymmetric links more. This will give a value |
| * between 0 and TQ_MAX_VALUE |
| */ |
| neigh_rq_inv = BATADV_TQ_LOCAL_WINDOW_SIZE - neigh_rq_count; |
| neigh_rq_inv_cube = neigh_rq_inv * neigh_rq_inv * neigh_rq_inv; |
| neigh_rq_max_cube = BATADV_TQ_LOCAL_WINDOW_SIZE * |
| BATADV_TQ_LOCAL_WINDOW_SIZE * |
| BATADV_TQ_LOCAL_WINDOW_SIZE; |
| inv_asym_penalty = BATADV_TQ_MAX_VALUE * neigh_rq_inv_cube; |
| inv_asym_penalty /= neigh_rq_max_cube; |
| tq_asym_penalty = BATADV_TQ_MAX_VALUE - inv_asym_penalty; |
| |
| /* penalize if the OGM is forwarded on the same interface. WiFi |
| * interfaces and other half duplex devices suffer from throughput |
| * drops as they can't send and receive at the same time. |
| */ |
| tq_iface_penalty = BATADV_TQ_MAX_VALUE; |
| if (if_outgoing && if_incoming == if_outgoing && |
| batadv_is_wifi_hardif(if_outgoing)) |
| tq_iface_penalty = batadv_hop_penalty(BATADV_TQ_MAX_VALUE, |
| bat_priv); |
| |
| combined_tq = batadv_ogm_packet->tq * |
| tq_own * |
| tq_asym_penalty * |
| tq_iface_penalty; |
| combined_tq /= BATADV_TQ_MAX_VALUE * |
| BATADV_TQ_MAX_VALUE * |
| BATADV_TQ_MAX_VALUE; |
| batadv_ogm_packet->tq = combined_tq; |
| |
| batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| "bidirectional: orig = %pM neigh = %pM => own_bcast = %2i, real recv = %2i, local tq: %3i, asym_penalty: %3i, iface_penalty: %3i, total tq: %3i, if_incoming = %s, if_outgoing = %s\n", |
| orig_node->orig, orig_neigh_node->orig, total_count, |
| neigh_rq_count, tq_own, tq_asym_penalty, tq_iface_penalty, |
| batadv_ogm_packet->tq, if_incoming->net_dev->name, |
| if_outgoing ? if_outgoing->net_dev->name : "DEFAULT"); |
| |
| /* if link has the minimum required transmission quality |
| * consider it bidirectional |
| */ |
| if (batadv_ogm_packet->tq >= BATADV_TQ_TOTAL_BIDRECT_LIMIT) |
| ret = true; |
| |
| out: |
| if (neigh_node) |
| batadv_neigh_node_put(neigh_node); |
| return ret; |
| } |
| |
| /** |
| * batadv_iv_ogm_update_seqnos() - process a batman packet for all interfaces, |
| * adjust the sequence number and find out whether it is a duplicate |
| * @ethhdr: ethernet header of the packet |
| * @batadv_ogm_packet: OGM packet to be considered |
| * @if_incoming: interface on which the OGM packet was received |
| * @if_outgoing: interface for which the retransmission should be considered |
| * |
| * Return: duplicate status as enum batadv_dup_status |
| */ |
| static enum batadv_dup_status |
| batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr, |
| const struct batadv_ogm_packet *batadv_ogm_packet, |
| const struct batadv_hard_iface *if_incoming, |
| struct batadv_hard_iface *if_outgoing) |
| { |
| struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
| struct batadv_orig_node *orig_node; |
| struct batadv_orig_ifinfo *orig_ifinfo = NULL; |
| struct batadv_neigh_node *neigh_node; |
| struct batadv_neigh_ifinfo *neigh_ifinfo; |
| bool is_dup; |
| s32 seq_diff; |
| bool need_update = false; |
| int set_mark; |
| enum batadv_dup_status ret = BATADV_NO_DUP; |
| u32 seqno = ntohl(batadv_ogm_packet->seqno); |
| u8 *neigh_addr; |
| u8 packet_count; |
| unsigned long *bitmap; |
| |
| orig_node = batadv_iv_ogm_orig_get(bat_priv, batadv_ogm_packet->orig); |
| if (!orig_node) |
| return BATADV_NO_DUP; |
| |
| orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing); |
| if (WARN_ON(!orig_ifinfo)) { |
| batadv_orig_node_put(orig_node); |
| return 0; |
| } |
| |
| spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock); |
| seq_diff = seqno - orig_ifinfo->last_real_seqno; |
| |
| /* signalize caller that the packet is to be dropped. */ |
| if (!hlist_empty(&orig_node->neigh_list) && |
| batadv_window_protected(bat_priv, seq_diff, |
| BATADV_TQ_LOCAL_WINDOW_SIZE, |
| &orig_ifinfo->batman_seqno_reset, NULL)) { |
| ret = BATADV_PROTECTED; |
| goto out; |
| } |
| |
| rcu_read_lock(); |
| hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) { |
| neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, |
| if_outgoing); |
| if (!neigh_ifinfo) |
| continue; |
| |
| neigh_addr = neigh_node->addr; |
| is_dup = batadv_test_bit(neigh_ifinfo->bat_iv.real_bits, |
| orig_ifinfo->last_real_seqno, |
| seqno); |
| |
| if (batadv_compare_eth(neigh_addr, ethhdr->h_source) && |
| neigh_node->if_incoming == if_incoming) { |
| set_mark = 1; |
| if (is_dup) |
| ret = BATADV_NEIGH_DUP; |
| } else { |
| set_mark = 0; |
| if (is_dup && ret != BATADV_NEIGH_DUP) |
| ret = BATADV_ORIG_DUP; |
| } |
| |
| /* if the window moved, set the update flag. */ |
| bitmap = neigh_ifinfo->bat_iv.real_bits; |
| need_update |= batadv_bit_get_packet(bat_priv, bitmap, |
| seq_diff, set_mark); |
| |
| packet_count = bitmap_weight(bitmap, |
| BATADV_TQ_LOCAL_WINDOW_SIZE); |
| neigh_ifinfo->bat_iv.real_packet_count = packet_count; |
| batadv_neigh_ifinfo_put(neigh_ifinfo); |
| } |
| rcu_read_unlock(); |
| |
| if (need_update) { |
| batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| "%s updating last_seqno: old %u, new %u\n", |
| if_outgoing ? if_outgoing->net_dev->name : "DEFAULT", |
| orig_ifinfo->last_real_seqno, seqno); |
| orig_ifinfo->last_real_seqno = seqno; |
| } |
| |
| out: |
| spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock); |
| batadv_orig_node_put(orig_node); |
| batadv_orig_ifinfo_put(orig_ifinfo); |
| return ret; |
| } |
| |
| /** |
| * batadv_iv_ogm_process_per_outif() - process a batman iv OGM for an outgoing |
| * interface |
| * @skb: the skb containing the OGM |
| * @ogm_offset: offset from skb->data to start of ogm header |
| * @orig_node: the (cached) orig node for the originator of this OGM |
| * @if_incoming: the interface where this packet was received |
| * @if_outgoing: the interface for which the packet should be considered |
| */ |
| static void |
| batadv_iv_ogm_process_per_outif(const struct sk_buff *skb, int ogm_offset, |
| struct batadv_orig_node *orig_node, |
| struct batadv_hard_iface *if_incoming, |
| struct batadv_hard_iface *if_outgoing) |
| { |
| struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
| struct batadv_hardif_neigh_node *hardif_neigh = NULL; |
| struct batadv_neigh_node *router = NULL; |
| struct batadv_neigh_node *router_router = NULL; |
| struct batadv_orig_node *orig_neigh_node; |
| struct batadv_orig_ifinfo *orig_ifinfo; |
| struct batadv_neigh_node *orig_neigh_router = NULL; |
| struct batadv_neigh_ifinfo *router_ifinfo = NULL; |
| struct batadv_ogm_packet *ogm_packet; |
| enum batadv_dup_status dup_status; |
| bool is_from_best_next_hop = false; |
| bool is_single_hop_neigh = false; |
| bool sameseq, similar_ttl; |
| struct sk_buff *skb_priv; |
| struct ethhdr *ethhdr; |
| u8 *prev_sender; |
| bool is_bidirect; |
| |
| /* create a private copy of the skb, as some functions change tq value |
| * and/or flags. |
| */ |
| skb_priv = skb_copy(skb, GFP_ATOMIC); |
| if (!skb_priv) |
| return; |
| |
| ethhdr = eth_hdr(skb_priv); |
| ogm_packet = (struct batadv_ogm_packet *)(skb_priv->data + ogm_offset); |
| |
| dup_status = batadv_iv_ogm_update_seqnos(ethhdr, ogm_packet, |
| if_incoming, if_outgoing); |
| if (batadv_compare_eth(ethhdr->h_source, ogm_packet->orig)) |
| is_single_hop_neigh = true; |
| |
| if (dup_status == BATADV_PROTECTED) { |
| batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| "Drop packet: packet within seqno protection time (sender: %pM)\n", |
| ethhdr->h_source); |
| goto out; |
| } |
| |
| if (ogm_packet->tq == 0) { |
| batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| "Drop packet: originator packet with tq equal 0\n"); |
| goto out; |
| } |
| |
| if (is_single_hop_neigh) { |
| hardif_neigh = batadv_hardif_neigh_get(if_incoming, |
| ethhdr->h_source); |
| if (hardif_neigh) |
| hardif_neigh->last_seen = jiffies; |
| } |
| |
| router = batadv_orig_router_get(orig_node, if_outgoing); |
| if (router) { |
| router_router = batadv_orig_router_get(router->orig_node, |
| if_outgoing); |
| router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing); |
| } |
| |
| if ((router_ifinfo && router_ifinfo->bat_iv.tq_avg != 0) && |
| (batadv_compare_eth(router->addr, ethhdr->h_source))) |
| is_from_best_next_hop = true; |
| |
| prev_sender = ogm_packet->prev_sender; |
| /* avoid temporary routing loops */ |
| if (router && router_router && |
| (batadv_compare_eth(router->addr, prev_sender)) && |
| !(batadv_compare_eth(ogm_packet->orig, prev_sender)) && |
| (batadv_compare_eth(router->addr, router_router->addr))) { |
| batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n", |
| ethhdr->h_source); |
| goto out; |
| } |
| |
| if (if_outgoing == BATADV_IF_DEFAULT) |
| batadv_tvlv_ogm_receive(bat_priv, ogm_packet, orig_node); |
| |
| /* if sender is a direct neighbor the sender mac equals |
| * originator mac |
| */ |
| if (is_single_hop_neigh) |
| orig_neigh_node = orig_node; |
| else |
| orig_neigh_node = batadv_iv_ogm_orig_get(bat_priv, |
| ethhdr->h_source); |
| |
| if (!orig_neigh_node) |
| goto out; |
| |
| /* Update nc_nodes of the originator */ |
| batadv_nc_update_nc_node(bat_priv, orig_node, orig_neigh_node, |
| ogm_packet, is_single_hop_neigh); |
| |
| orig_neigh_router = batadv_orig_router_get(orig_neigh_node, |
| if_outgoing); |
| |
| /* drop packet if sender is not a direct neighbor and if we |
| * don't route towards it |
| */ |
| if (!is_single_hop_neigh && !orig_neigh_router) { |
| batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| "Drop packet: OGM via unknown neighbor!\n"); |
| goto out_neigh; |
| } |
| |
| is_bidirect = batadv_iv_ogm_calc_tq(orig_node, orig_neigh_node, |
| ogm_packet, if_incoming, |
| if_outgoing); |
| |
| /* update ranking if it is not a duplicate or has the same |
| * seqno and similar ttl as the non-duplicate |
| */ |
| orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing); |
| if (!orig_ifinfo) |
| goto out_neigh; |
| |
| sameseq = orig_ifinfo->last_real_seqno == ntohl(ogm_packet->seqno); |
| similar_ttl = (orig_ifinfo->last_ttl - 3) <= ogm_packet->ttl; |
| |
| if (is_bidirect && (dup_status == BATADV_NO_DUP || |
| (sameseq && similar_ttl))) { |
| batadv_iv_ogm_orig_update(bat_priv, orig_node, |
| orig_ifinfo, ethhdr, |
| ogm_packet, if_incoming, |
| if_outgoing, dup_status); |
| } |
| batadv_orig_ifinfo_put(orig_ifinfo); |
| |
| /* only forward for specific interface, not for the default one. */ |
| if (if_outgoing == BATADV_IF_DEFAULT) |
| goto out_neigh; |
| |
| /* is single hop (direct) neighbor */ |
| if (is_single_hop_neigh) { |
| /* OGMs from secondary interfaces should only scheduled once |
| * per interface where it has been received, not multiple times |
| */ |
| if (ogm_packet->ttl <= 2 && |
| if_incoming != if_outgoing) { |
| batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| "Drop packet: OGM from secondary interface and wrong outgoing interface\n"); |
| goto out_neigh; |
| } |
| /* mark direct link on incoming interface */ |
| batadv_iv_ogm_forward(orig_node, ethhdr, ogm_packet, |
| is_single_hop_neigh, |
| is_from_best_next_hop, if_incoming, |
| if_outgoing); |
| |
| batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| "Forwarding packet: rebroadcast neighbor packet with direct link flag\n"); |
| goto out_neigh; |
| } |
| |
| /* multihop originator */ |
| if (!is_bidirect) { |
| batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| "Drop packet: not received via bidirectional link\n"); |
| goto out_neigh; |
| } |
| |
| if (dup_status == BATADV_NEIGH_DUP) { |
| batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| "Drop packet: duplicate packet received\n"); |
| goto out_neigh; |
| } |
| |
| batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| "Forwarding packet: rebroadcast originator packet\n"); |
| batadv_iv_ogm_forward(orig_node, ethhdr, ogm_packet, |
| is_single_hop_neigh, is_from_best_next_hop, |
| if_incoming, if_outgoing); |
| |
| out_neigh: |
| if (orig_neigh_node && !is_single_hop_neigh) |
| batadv_orig_node_put(orig_neigh_node); |
| out: |
| if (router_ifinfo) |
| batadv_neigh_ifinfo_put(router_ifinfo); |
| if (router) |
| batadv_neigh_node_put(router); |
| if (router_router) |
| batadv_neigh_node_put(router_router); |
| if (orig_neigh_router) |
| batadv_neigh_node_put(orig_neigh_router); |
| if (hardif_neigh) |
| batadv_hardif_neigh_put(hardif_neigh); |
| |
| consume_skb(skb_priv); |
| } |
| |
| /** |
| * batadv_iv_ogm_process() - process an incoming batman iv OGM |
| * @skb: the skb containing the OGM |
| * @ogm_offset: offset to the OGM which should be processed (for aggregates) |
| * @if_incoming: the interface where this packet was receved |
| */ |
| static void batadv_iv_ogm_process(const struct sk_buff *skb, int ogm_offset, |
| struct batadv_hard_iface *if_incoming) |
| { |
| struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
| struct batadv_orig_node *orig_neigh_node, *orig_node; |
| struct batadv_hard_iface *hard_iface; |
| struct batadv_ogm_packet *ogm_packet; |
| u32 if_incoming_seqno; |
| bool has_directlink_flag; |
| struct ethhdr *ethhdr; |
| bool is_my_oldorig = false; |
| bool is_my_addr = false; |
| bool is_my_orig = false; |
| |
| ogm_packet = (struct batadv_ogm_packet *)(skb->data + ogm_offset); |
| ethhdr = eth_hdr(skb); |
| |
| /* Silently drop when the batman packet is actually not a |
| * correct packet. |
| * |
| * This might happen if a packet is padded (e.g. Ethernet has a |
| * minimum frame length of 64 byte) and the aggregation interprets |
| * it as an additional length. |
| * |
| * TODO: A more sane solution would be to have a bit in the |
| * batadv_ogm_packet to detect whether the packet is the last |
| * packet in an aggregation. Here we expect that the padding |
| * is always zero (or not 0x01) |
| */ |
| if (ogm_packet->packet_type != BATADV_IV_OGM) |
| return; |
| |
| /* could be changed by schedule_own_packet() */ |
| if_incoming_seqno = atomic_read(&if_incoming->bat_iv.ogm_seqno); |
| |
| if (ogm_packet->flags & BATADV_DIRECTLINK) |
| has_directlink_flag = true; |
| else |
| has_directlink_flag = false; |
| |
| batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| "Received BATMAN packet via NB: %pM, IF: %s [%pM] (from OG: %pM, via prev OG: %pM, seqno %u, tq %d, TTL %d, V %d, IDF %d)\n", |
| ethhdr->h_source, if_incoming->net_dev->name, |
| if_incoming->net_dev->dev_addr, ogm_packet->orig, |
| ogm_packet->prev_sender, ntohl(ogm_packet->seqno), |
| ogm_packet->tq, ogm_packet->ttl, |
| ogm_packet->version, has_directlink_flag); |
| |
| rcu_read_lock(); |
| list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
| if (hard_iface->if_status != BATADV_IF_ACTIVE) |
| continue; |
| |
| if (hard_iface->soft_iface != if_incoming->soft_iface) |
| continue; |
| |
| if (batadv_compare_eth(ethhdr->h_source, |
| hard_iface->net_dev->dev_addr)) |
| is_my_addr = true; |
| |
| if (batadv_compare_eth(ogm_packet->orig, |
| hard_iface->net_dev->dev_addr)) |
| is_my_orig = true; |
| |
| if (batadv_compare_eth(ogm_packet->prev_sender, |
| hard_iface->net_dev->dev_addr)) |
| is_my_oldorig = true; |
| } |
| rcu_read_unlock(); |
| |
| if (is_my_addr) { |
| batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| "Drop packet: received my own broadcast (sender: %pM)\n", |
| ethhdr->h_source); |
| return; |
| } |
| |
| if (is_my_orig) { |
| unsigned long *word; |
| size_t offset; |
| s32 bit_pos; |
| unsigned int if_num; |
| u8 *weight; |
| |
| orig_neigh_node = batadv_iv_ogm_orig_get(bat_priv, |
| ethhdr->h_source); |
| if (!orig_neigh_node) |
| return; |
| |
| /* neighbor has to indicate direct link and it has to |
| * come via the corresponding interface |
| * save packet seqno for bidirectional check |
| */ |
| if (has_directlink_flag && |
| batadv_compare_eth(if_incoming->net_dev->dev_addr, |
| ogm_packet->orig)) { |
| if_num = if_incoming->if_num; |
| offset = if_num * BATADV_NUM_WORDS; |
| |
| 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(ogm_packet->seqno); |
| batadv_set_bit(word, bit_pos); |
| 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->bat_iv.ogm_cnt_lock); |
| } |
| |
| batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| "Drop packet: originator packet from myself (via neighbor)\n"); |
| batadv_orig_node_put(orig_neigh_node); |
| return; |
| } |
| |
| if (is_my_oldorig) { |
| batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| "Drop packet: ignoring all rebroadcast echos (sender: %pM)\n", |
| ethhdr->h_source); |
| return; |
| } |
| |
| if (ogm_packet->flags & BATADV_NOT_BEST_NEXT_HOP) { |
| batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| "Drop packet: ignoring all packets not forwarded from the best next hop (sender: %pM)\n", |
| ethhdr->h_source); |
| return; |
| } |
| |
| orig_node = batadv_iv_ogm_orig_get(bat_priv, ogm_packet->orig); |
| if (!orig_node) |
| return; |
| |
| batadv_iv_ogm_process_per_outif(skb, ogm_offset, orig_node, |
| if_incoming, BATADV_IF_DEFAULT); |
| |
| rcu_read_lock(); |
| list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
| if (hard_iface->if_status != BATADV_IF_ACTIVE) |
| continue; |
| |
| if (hard_iface->soft_iface != bat_priv->soft_iface) |
| continue; |
| |
| if (!kref_get_unless_zero(&hard_iface->refcount)) |
| continue; |
| |
| batadv_iv_ogm_process_per_outif(skb, ogm_offset, orig_node, |
| if_incoming, hard_iface); |
| |
| batadv_hardif_put(hard_iface); |
| } |
| rcu_read_unlock(); |
| |
| batadv_orig_node_put(orig_node); |
| } |
| |
| static void batadv_iv_send_outstanding_bat_ogm_packet(struct work_struct *work) |
| { |
| struct delayed_work *delayed_work; |
| struct batadv_forw_packet *forw_packet; |
| struct batadv_priv *bat_priv; |
| bool dropped = false; |
| |
| delayed_work = to_delayed_work(work); |
| forw_packet = container_of(delayed_work, struct batadv_forw_packet, |
| delayed_work); |
| bat_priv = netdev_priv(forw_packet->if_incoming->soft_iface); |
| |
| if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING) { |
| dropped = true; |
| goto out; |
| } |
| |
| batadv_iv_ogm_emit(forw_packet); |
| |
| /* we have to have at least one packet in the queue to determine the |
| * queues wake up time unless we are shutting down. |
| * |
| * only re-schedule if this is the "original" copy, e.g. the OGM of the |
| * primary interface should only be rescheduled once per period, but |
| * this function will be called for the forw_packet instances of the |
| * other secondary interfaces as well. |
| */ |
| if (forw_packet->own && |
| forw_packet->if_incoming == forw_packet->if_outgoing) |
| batadv_iv_ogm_schedule(forw_packet->if_incoming); |
| |
| out: |
| /* do we get something for free()? */ |
| if (batadv_forw_packet_steal(forw_packet, |
| &bat_priv->forw_bat_list_lock)) |
| batadv_forw_packet_free(forw_packet, dropped); |
| } |
| |
| static int batadv_iv_ogm_receive(struct sk_buff *skb, |
| struct batadv_hard_iface *if_incoming) |
| { |
| struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
| struct batadv_ogm_packet *ogm_packet; |
| u8 *packet_pos; |
| int ogm_offset; |
| bool res; |
| int ret = NET_RX_DROP; |
| |
| res = batadv_check_management_packet(skb, if_incoming, BATADV_OGM_HLEN); |
| if (!res) |
| goto free_skb; |
| |
| /* did we receive a B.A.T.M.A.N. IV OGM packet on an interface |
| * that does not have B.A.T.M.A.N. IV enabled ? |
| */ |
| if (bat_priv->algo_ops->iface.enable != batadv_iv_ogm_iface_enable) |
| goto free_skb; |
| |
| batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX); |
| batadv_add_counter(bat_priv, BATADV_CNT_MGMT_RX_BYTES, |
| skb->len + ETH_HLEN); |
| |
| ogm_offset = 0; |
| ogm_packet = (struct batadv_ogm_packet *)skb->data; |
| |
| /* unpack the aggregated packets and process them one by one */ |
| while (batadv_iv_ogm_aggr_packet(ogm_offset, skb_headlen(skb), |
| ogm_packet->tvlv_len)) { |
| batadv_iv_ogm_process(skb, ogm_offset, if_incoming); |
| |
| ogm_offset += BATADV_OGM_HLEN; |
| ogm_offset += ntohs(ogm_packet->tvlv_len); |
| |
| packet_pos = skb->data + ogm_offset; |
| ogm_packet = (struct batadv_ogm_packet *)packet_pos; |
| } |
| |
| ret = NET_RX_SUCCESS; |
| |
| free_skb: |
| if (ret == NET_RX_SUCCESS) |
| consume_skb(skb); |
| else |
| kfree_skb(skb); |
| |
| return ret; |
| } |
| |
| #ifdef CONFIG_BATMAN_ADV_DEBUGFS |
| /** |
| * batadv_iv_ogm_orig_print_neigh() - print neighbors for the originator table |
| * @orig_node: the orig_node for which the neighbors are printed |
| * @if_outgoing: outgoing interface for these entries |
| * @seq: debugfs table seq_file struct |
| * |
| * Must be called while holding an rcu lock. |
| */ |
| static void |
| batadv_iv_ogm_orig_print_neigh(struct batadv_orig_node *orig_node, |
| struct batadv_hard_iface *if_outgoing, |
| struct seq_file *seq) |
| { |
| struct batadv_neigh_node *neigh_node; |
| struct batadv_neigh_ifinfo *n_ifinfo; |
| |
| hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) { |
| n_ifinfo = batadv_neigh_ifinfo_get(neigh_node, if_outgoing); |
| if (!n_ifinfo) |
| continue; |
| |
| seq_printf(seq, " %pM (%3i)", |
| neigh_node->addr, |
| n_ifinfo->bat_iv.tq_avg); |
| |
| batadv_neigh_ifinfo_put(n_ifinfo); |
| } |
| } |
| |
| /** |
| * batadv_iv_ogm_orig_print() - print the originator table |
| * @bat_priv: the bat priv with all the soft interface information |
| * @seq: debugfs table seq_file struct |
| * @if_outgoing: the outgoing interface for which this should be printed |
| */ |
| static void batadv_iv_ogm_orig_print(struct batadv_priv *bat_priv, |
| struct seq_file *seq, |
| struct batadv_hard_iface *if_outgoing) |
| { |
| struct batadv_neigh_node *neigh_node; |
| struct batadv_hashtable *hash = bat_priv->orig_hash; |
| int last_seen_msecs, last_seen_secs; |
| struct batadv_orig_node *orig_node; |
| struct batadv_neigh_ifinfo *n_ifinfo; |
| unsigned long last_seen_jiffies; |
| struct hlist_head *head; |
| int batman_count = 0; |
| u32 i; |
| |
| seq_puts(seq, |
| " Originator last-seen (#/255) Nexthop [outgoingIF]: Potential nexthops ...\n"); |
| |
| for (i = 0; i < hash->size; i++) { |
| head = &hash->table[i]; |
| |
| rcu_read_lock(); |
| hlist_for_each_entry_rcu(orig_node, head, hash_entry) { |
| neigh_node = batadv_orig_router_get(orig_node, |
| if_outgoing); |
| if (!neigh_node) |
| continue; |
| |
| n_ifinfo = batadv_neigh_ifinfo_get(neigh_node, |
| if_outgoing); |
| if (!n_ifinfo) |
| goto next; |
| |
| if (n_ifinfo->bat_iv.tq_avg == 0) |
| goto next; |
| |
| last_seen_jiffies = jiffies - orig_node->last_seen; |
| last_seen_msecs = jiffies_to_msecs(last_seen_jiffies); |
| last_seen_secs = last_seen_msecs / 1000; |
| last_seen_msecs = last_seen_msecs % 1000; |
| |
| seq_printf(seq, "%pM %4i.%03is (%3i) %pM [%10s]:", |
| orig_node->orig, last_seen_secs, |
| last_seen_msecs, n_ifinfo->bat_iv.tq_avg, |
| neigh_node->addr, |
| neigh_node->if_incoming->net_dev->name); |
| |
| batadv_iv_ogm_orig_print_neigh(orig_node, if_outgoing, |
| seq); |
| seq_putc(seq, '\n'); |
| batman_count++; |
| |
| next: |
| batadv_neigh_node_put(neigh_node); |
| if (n_ifinfo) |
| batadv_neigh_ifinfo_put(n_ifinfo); |
| } |
| rcu_read_unlock(); |
| } |
| |
| if (batman_count == 0) |
| seq_puts(seq, "No batman nodes in range ...\n"); |
| } |
| #endif |
| |
| /** |
| * batadv_iv_ogm_neigh_get_tq_avg() - Get the TQ average for a neighbour on a |
| * given outgoing interface. |
| * @neigh_node: Neighbour of interest |
| * @if_outgoing: Outgoing interface of interest |
| * @tq_avg: Pointer of where to store the TQ average |
| * |
| * Return: False if no average TQ available, otherwise true. |
| */ |
| static bool |
| batadv_iv_ogm_neigh_get_tq_avg(struct batadv_neigh_node *neigh_node, |
| struct batadv_hard_iface *if_outgoing, |
| u8 *tq_avg) |
| { |
| struct batadv_neigh_ifinfo *n_ifinfo; |
| |
| n_ifinfo = batadv_neigh_ifinfo_get(neigh_node, if_outgoing); |
| if (!n_ifinfo) |
| return false; |
| |
| *tq_avg = n_ifinfo->bat_iv.tq_avg; |
| batadv_neigh_ifinfo_put(n_ifinfo); |
| |
| return true; |
| } |
| |
| /** |
| * batadv_iv_ogm_orig_dump_subentry() - Dump an originator subentry into a |
| * message |
| * @msg: Netlink message to dump into |
| * @portid: Port making netlink request |
| * @seq: Sequence number of netlink message |
| * @bat_priv: The bat priv with all the soft interface information |
| * @if_outgoing: Limit dump to entries with this outgoing interface |
| * @orig_node: Originator to dump |
| * @neigh_node: Single hops neighbour |
| * @best: Is the best originator |
| * |
| * Return: Error code, or 0 on success |
| */ |
| static int |
| batadv_iv_ogm_orig_dump_subentry(struct sk_buff *msg, u32 portid, u32 seq, |
| struct batadv_priv *bat_priv, |
| struct batadv_hard_iface *if_outgoing, |
| struct batadv_orig_node *orig_node, |
| struct batadv_neigh_node *neigh_node, |
| bool best) |
| { |
| void *hdr; |
| u8 tq_avg; |
| unsigned int last_seen_msecs; |
| |
| last_seen_msecs = jiffies_to_msecs(jiffies - orig_node->last_seen); |
| |
| if (!batadv_iv_ogm_neigh_get_tq_avg(neigh_node, if_outgoing, &tq_avg)) |
| return 0; |
| |
| if (if_outgoing != BATADV_IF_DEFAULT && |
| if_outgoing != neigh_node->if_incoming) |
| return 0; |
| |
| hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family, |
| NLM_F_MULTI, BATADV_CMD_GET_ORIGINATORS); |
| if (!hdr) |
| return -ENOBUFS; |
| |
| if (nla_put(msg, BATADV_ATTR_ORIG_ADDRESS, ETH_ALEN, |
| orig_node->orig) || |
| nla_put(msg, BATADV_ATTR_NEIGH_ADDRESS, ETH_ALEN, |
| neigh_node->addr) || |
| nla_put_u32(msg, BATADV_ATTR_HARD_IFINDEX, |
| neigh_node->if_incoming->net_dev->ifindex) || |
| nla_put_u8(msg, BATADV_ATTR_TQ, tq_avg) || |
| nla_put_u32(msg, BATADV_ATTR_LAST_SEEN_MSECS, |
| last_seen_msecs)) |
| goto nla_put_failure; |
| |
| if (best && nla_put_flag(msg, BATADV_ATTR_FLAG_BEST)) |
| goto nla_put_failure; |
| |
| genlmsg_end(msg, hdr); |
| return 0; |
| |
| nla_put_failure: |
| genlmsg_cancel(msg, hdr); |
| return -EMSGSIZE; |
| } |
| |
| /** |
| * batadv_iv_ogm_orig_dump_entry() - Dump an originator entry into a message |
| * @msg: Netlink message to dump into |
| * @portid: Port making netlink request |
| * @seq: Sequence number of netlink message |
| * @bat_priv: The bat priv with all the soft interface information |
| * @if_outgoing: Limit dump to entries with this outgoing interface |
| * @orig_node: Originator to dump |
| * @sub_s: Number of sub entries to skip |
| * |
| * This function assumes the caller holds rcu_read_lock(). |
| * |
| * Return: Error code, or 0 on success |
| */ |
| static int |
| batadv_iv_ogm_orig_dump_entry(struct sk_buff *msg, u32 portid, u32 seq, |
| struct batadv_priv *bat_priv, |
| struct batadv_hard_iface *if_outgoing, |
| struct batadv_orig_node *orig_node, int *sub_s) |
| { |
| struct batadv_neigh_node *neigh_node_best; |
| struct batadv_neigh_node *neigh_node; |
| int sub = 0; |
| bool best; |
| u8 tq_avg_best; |
| |
| neigh_node_best = batadv_orig_router_get(orig_node, if_outgoing); |
| if (!neigh_node_best) |
| goto out; |
| |
| if (!batadv_iv_ogm_neigh_get_tq_avg(neigh_node_best, if_outgoing, |
| &tq_avg_best)) |
| goto out; |
| |
| if (tq_avg_best == 0) |
| goto out; |
| |
| hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) { |
| if (sub++ < *sub_s) |
| continue; |
| |
| best = (neigh_node == neigh_node_best); |
| |
| if (batadv_iv_ogm_orig_dump_subentry(msg, portid, seq, |
| bat_priv, if_outgoing, |
| orig_node, neigh_node, |
| best)) { |
| batadv_neigh_node_put(neigh_node_best); |
| |
| *sub_s = sub - 1; |
| return -EMSGSIZE; |
| } |
| } |
| |
| out: |
| if (neigh_node_best) |
| batadv_neigh_node_put(neigh_node_best); |
| |
| *sub_s = 0; |
| return 0; |
| } |
| |
| /** |
| * batadv_iv_ogm_orig_dump_bucket() - Dump an originator bucket into a |
| * message |
| * @msg: Netlink message to dump into |
| * @portid: Port making netlink request |
| * @seq: Sequence number of netlink message |
| * @bat_priv: The bat priv with all the soft interface information |
| * @if_outgoing: Limit dump to entries with this outgoing interface |
| * @head: Bucket to be dumped |
| * @idx_s: Number of entries to be skipped |
| * @sub: Number of sub entries to be skipped |
| * |
| * Return: Error code, or 0 on success |
| */ |
| static int |
| batadv_iv_ogm_orig_dump_bucket(struct sk_buff *msg, u32 portid, u32 seq, |
| struct batadv_priv *bat_priv, |
| struct batadv_hard_iface *if_outgoing, |
| struct hlist_head *head, int *idx_s, int *sub) |
| { |
| struct batadv_orig_node *orig_node; |
| int idx = 0; |
| |
| rcu_read_lock(); |
| hlist_for_each_entry_rcu(orig_node, head, hash_entry) { |
| if (idx++ < *idx_s) |
| continue; |
| |
| if (batadv_iv_ogm_orig_dump_entry(msg, portid, seq, bat_priv, |
| if_outgoing, orig_node, |
| sub)) { |
| rcu_read_unlock(); |
| *idx_s = idx - 1; |
| return -EMSGSIZE; |
| } |
| } |
| rcu_read_unlock(); |
| |
| *idx_s = 0; |
| *sub = 0; |
| return 0; |
| } |
| |
| /** |
| * batadv_iv_ogm_orig_dump() - Dump the originators into a message |
| * @msg: Netlink message to dump into |
| * @cb: Control block containing additional options |
| * @bat_priv: The bat priv with all the soft interface information |
| * @if_outgoing: Limit dump to entries with this outgoing interface |
| */ |
| static void |
| batadv_iv_ogm_orig_dump(struct sk_buff *msg, struct netlink_callback *cb, |
| struct batadv_priv *bat_priv, |
| struct batadv_hard_iface *if_outgoing) |
| { |
| struct batadv_hashtable *hash = bat_priv->orig_hash; |
| struct hlist_head *head; |
| int bucket = cb->args[0]; |
| int idx = cb->args[1]; |
| int sub = cb->args[2]; |
| int portid = NETLINK_CB(cb->skb).portid; |
| |
| while (bucket < hash->size) { |
| head = &hash->table[bucket]; |
| |
| if (batadv_iv_ogm_orig_dump_bucket(msg, portid, |
| cb->nlh->nlmsg_seq, |
| bat_priv, if_outgoing, head, |
| &idx, &sub)) |
| break; |
| |
| bucket++; |
| } |
| |
| cb->args[0] = bucket; |
| cb->args[1] = idx; |
| cb->args[2] = sub; |
| } |
| |
| #ifdef CONFIG_BATMAN_ADV_DEBUGFS |
| /** |
| * batadv_iv_hardif_neigh_print() - print a single hop neighbour node |
| * @seq: neighbour table seq_file struct |
| * @hardif_neigh: hardif neighbour information |
| */ |
| static void |
| batadv_iv_hardif_neigh_print(struct seq_file *seq, |
| struct batadv_hardif_neigh_node *hardif_neigh) |
| { |
| int last_secs, last_msecs; |
| |
| last_secs = jiffies_to_msecs(jiffies - hardif_neigh->last_seen) / 1000; |
| last_msecs = jiffies_to_msecs(jiffies - hardif_neigh->last_seen) % 1000; |
| |
| seq_printf(seq, " %10s %pM %4i.%03is\n", |
| hardif_neigh->if_incoming->net_dev->name, |
| hardif_neigh->addr, last_secs, last_msecs); |
| } |
| |
| /** |
| * batadv_iv_ogm_neigh_print() - print the single hop neighbour list |
| * @bat_priv: the bat priv with all the soft interface information |
| * @seq: neighbour table seq_file struct |
| */ |
| static void batadv_iv_neigh_print(struct batadv_priv *bat_priv, |
| struct seq_file *seq) |
| { |
| struct net_device *net_dev = (struct net_device *)seq->private; |
| struct batadv_hardif_neigh_node *hardif_neigh; |
| struct batadv_hard_iface *hard_iface; |
| int batman_count = 0; |
| |
| seq_puts(seq, " IF Neighbor last-seen\n"); |
| |
| rcu_read_lock(); |
| list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
| if (hard_iface->soft_iface != net_dev) |
| continue; |
| |
| hlist_for_each_entry_rcu(hardif_neigh, |
| &hard_iface->neigh_list, list) { |
| batadv_iv_hardif_neigh_print(seq, hardif_neigh); |
| batman_count++; |
| } |
| } |
| rcu_read_unlock(); |
| |
| if (batman_count == 0) |
| seq_puts(seq, "No batman nodes in range ...\n"); |
| } |
| #endif |
| |
| /** |
| * batadv_iv_ogm_neigh_diff() - calculate tq difference of two neighbors |
| * @neigh1: the first neighbor object of the comparison |
| * @if_outgoing1: outgoing interface for the first neighbor |
| * @neigh2: the second neighbor object of the comparison |
| * @if_outgoing2: outgoing interface for the second neighbor |
| * @diff: pointer to integer receiving the calculated difference |
| * |
| * The content of *@diff is only valid when this function returns true. |
| * It is less, equal to or greater than 0 if the metric via neigh1 is lower, |
| * the same as or higher than the metric via neigh2 |
| * |
| * Return: true when the difference could be calculated, false otherwise |
| */ |
| static bool batadv_iv_ogm_neigh_diff(struct batadv_neigh_node *neigh1, |
| struct batadv_hard_iface *if_outgoing1, |
| struct batadv_neigh_node *neigh2, |
| struct batadv_hard_iface *if_outgoing2, |
| int *diff) |
| { |
| struct batadv_neigh_ifinfo *neigh1_ifinfo, *neigh2_ifinfo; |
| u8 tq1, tq2; |
| bool ret = true; |
| |
| neigh1_ifinfo = batadv_neigh_ifinfo_get(neigh1, if_outgoing1); |
| neigh2_ifinfo = batadv_neigh_ifinfo_get(neigh2, if_outgoing2); |
| |
| if (!neigh1_ifinfo || !neigh2_ifinfo) { |
| ret = false; |
| goto out; |
| } |
| |
| tq1 = neigh1_ifinfo->bat_iv.tq_avg; |
| tq2 = neigh2_ifinfo->bat_iv.tq_avg; |
| *diff = (int)tq1 - (int)tq2; |
| |
| out: |
| if (neigh1_ifinfo) |
| batadv_neigh_ifinfo_put(neigh1_ifinfo); |
| if (neigh2_ifinfo) |
| batadv_neigh_ifinfo_put(neigh2_ifinfo); |
| |
| return ret; |
| } |
| |
| /** |
| * batadv_iv_ogm_neigh_dump_neigh() - Dump a neighbour into a netlink message |
| * @msg: Netlink message to dump into |
| * @portid: Port making netlink request |
| * @seq: Sequence number of netlink message |
| * @hardif_neigh: Neighbour to be dumped |
| * |
| * Return: Error code, or 0 on success |
| */ |
| static int |
| batadv_iv_ogm_neigh_dump_neigh(struct sk_buff *msg, u32 portid, u32 seq, |
| struct batadv_hardif_neigh_node *hardif_neigh) |
| { |
| void *hdr; |
| unsigned int last_seen_msecs; |
| |
| last_seen_msecs = jiffies_to_msecs(jiffies - hardif_neigh->last_seen); |
| |
| hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family, |
| NLM_F_MULTI, BATADV_CMD_GET_NEIGHBORS); |
| if (!hdr) |
| return -ENOBUFS; |
| |
| if (nla_put(msg, BATADV_ATTR_NEIGH_ADDRESS, ETH_ALEN, |
| hardif_neigh->addr) || |
| nla_put_u32(msg, BATADV_ATTR_HARD_IFINDEX, |
| hardif_neigh->if_incoming->net_dev->ifindex) || |
| nla_put_u32(msg, BATADV_ATTR_LAST_SEEN_MSECS, |
| last_seen_msecs)) |
| goto nla_put_failure; |
| |
| genlmsg_end(msg, hdr); |
| return 0; |
| |
| nla_put_failure: |
| genlmsg_cancel(msg, hdr); |
| return -EMSGSIZE; |
| } |
| |
| /** |
| * batadv_iv_ogm_neigh_dump_hardif() - Dump the neighbours of a hard interface |
| * into a message |
| * @msg: Netlink message to dump into |
| * @portid: Port making netlink request |
| * @seq: Sequence number of netlink message |
| * @bat_priv: The bat priv with all the soft interface information |
| * @hard_iface: Hard interface to dump the neighbours for |
| * @idx_s: Number of entries to skip |
| * |
| * This function assumes the caller holds rcu_read_lock(). |
| * |
| * Return: Error code, or 0 on success |
| */ |
| static int |
| batadv_iv_ogm_neigh_dump_hardif(struct sk_buff *msg, u32 portid, u32 seq, |
| struct batadv_priv *bat_priv, |
| struct batadv_hard_iface *hard_iface, |
| int *idx_s) |
| { |
| struct batadv_hardif_neigh_node *hardif_neigh; |
| int idx = 0; |
| |
| hlist_for_each_entry_rcu(hardif_neigh, |
| &hard_iface->neigh_list, list) { |
| if (idx++ < *idx_s) |
| continue; |
| |
| if (batadv_iv_ogm_neigh_dump_neigh(msg, portid, seq, |
| hardif_neigh)) { |
| *idx_s = idx - 1; |
| return -EMSGSIZE; |
| } |
| } |
| |
| *idx_s = 0; |
| return 0; |
| } |
| |
| /** |
| * batadv_iv_ogm_neigh_dump() - Dump the neighbours into a message |
| * @msg: Netlink message to dump into |
| * @cb: Control block containing additional options |
| * @bat_priv: The bat priv with all the soft interface information |
| * @single_hardif: Limit dump to this hard interfaace |
| */ |
| static void |
| batadv_iv_ogm_neigh_dump(struct sk_buff *msg, struct netlink_callback *cb, |
| struct batadv_priv *bat_priv, |
| struct batadv_hard_iface *single_hardif) |
| { |
| struct batadv_hard_iface *hard_iface; |
| int i_hardif = 0; |
| int i_hardif_s = cb->args[0]; |
| int idx = cb->args[1]; |
| int portid = NETLINK_CB(cb->skb).portid; |
| |
| rcu_read_lock(); |
| if (single_hardif) { |
| if (i_hardif_s == 0) { |
| if (batadv_iv_ogm_neigh_dump_hardif(msg, portid, |
| cb->nlh->nlmsg_seq, |
| bat_priv, |
| single_hardif, |
| &idx) == 0) |
| i_hardif++; |
| } |
| } else { |
| list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, |
| list) { |
| if (hard_iface->soft_iface != bat_priv->soft_iface) |
| continue; |
| |
| if (i_hardif++ < i_hardif_s) |
| continue; |
| |
| if (batadv_iv_ogm_neigh_dump_hardif(msg, portid, |
| cb->nlh->nlmsg_seq, |
| bat_priv, |
| hard_iface, &idx)) { |
| i_hardif--; |
| break; |
| } |
| } |
| } |
| rcu_read_unlock(); |
| |
| cb->args[0] = i_hardif; |
| cb->args[1] = idx; |
| } |
| |
| /** |
| * batadv_iv_ogm_neigh_cmp() - compare the metrics of two neighbors |
| * @neigh1: the first neighbor object of the comparison |
| * @if_outgoing1: outgoing interface for the first neighbor |
| * @neigh2: the second neighbor object of the comparison |
| * @if_outgoing2: outgoing interface for the second neighbor |
| * |
| * Return: 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_hard_iface *if_outgoing1, |
| struct batadv_neigh_node *neigh2, |
| struct batadv_hard_iface *if_outgoing2) |
| { |
| bool ret; |
| int diff; |
| |
| ret = batadv_iv_ogm_neigh_diff(neigh1, if_outgoing1, neigh2, |
| if_outgoing2, &diff); |
| if (!ret) |
| return 0; |
| |
| return diff; |
| } |
| |
| /** |
| * batadv_iv_ogm_neigh_is_sob() - check if neigh1 is similarly good or better |
| * than neigh2 from the metric prospective |
| * @neigh1: the first neighbor object of the comparison |
| * @if_outgoing1: outgoing interface for the first neighbor |
| * @neigh2: the second neighbor object of the comparison |
| * @if_outgoing2: outgoing interface for the second neighbor |
| * |
| * Return: true if the metric via neigh1 is equally good or better than |
| * the metric via neigh2, false otherwise. |
| */ |
| static bool |
| batadv_iv_ogm_neigh_is_sob(struct batadv_neigh_node *neigh1, |
| struct batadv_hard_iface *if_outgoing1, |
| struct batadv_neigh_node *neigh2, |
| struct batadv_hard_iface *if_outgoing2) |
| { |
| bool ret; |
| int diff; |
| |
| ret = batadv_iv_ogm_neigh_diff(neigh1, if_outgoing1, neigh2, |
| if_outgoing2, &diff); |
| if (!ret) |
| return false; |
| |
| ret = diff > -BATADV_TQ_SIMILARITY_THRESHOLD; |
| return ret; |
| } |
| |
| static void batadv_iv_iface_activate(struct batadv_hard_iface *hard_iface) |
| { |
| /* begin scheduling originator messages on that interface */ |
| batadv_iv_ogm_schedule(hard_iface); |
| } |
| |
| /** |
| * batadv_iv_init_sel_class() - initialize GW selection class |
| * @bat_priv: the bat priv with all the soft interface information |
| */ |
| static void batadv_iv_init_sel_class(struct batadv_priv *bat_priv) |
| { |
| /* set default TQ difference threshold to 20 */ |
| atomic_set(&bat_priv->gw.sel_class, 20); |
| } |
| |
| static struct batadv_gw_node * |
| batadv_iv_gw_get_best_gw_node(struct batadv_priv *bat_priv) |
| { |
| struct batadv_neigh_node *router; |
| struct batadv_neigh_ifinfo *router_ifinfo; |
| struct batadv_gw_node *gw_node, *curr_gw = NULL; |
| u64 max_gw_factor = 0; |
| u64 tmp_gw_factor = 0; |
| u8 max_tq = 0; |
| u8 tq_avg; |
| struct batadv_orig_node *orig_node; |
| |
| rcu_read_lock(); |
| hlist_for_each_entry_rcu(gw_node, &bat_priv->gw.gateway_list, list) { |
| orig_node = gw_node->orig_node; |
| router = batadv_orig_router_get(orig_node, BATADV_IF_DEFAULT); |
| if (!router) |
| continue; |
| |
| router_ifinfo = batadv_neigh_ifinfo_get(router, |
| BATADV_IF_DEFAULT); |
| if (!router_ifinfo) |
| goto next; |
| |
| if (!kref_get_unless_zero(&gw_node->refcount)) |
| goto next; |
| |
| tq_avg = router_ifinfo->bat_iv.tq_avg; |
| |
| switch (atomic_read(&bat_priv->gw.sel_class)) { |
| case 1: /* fast connection */ |
| tmp_gw_factor = tq_avg * tq_avg; |
| tmp_gw_factor *= gw_node->bandwidth_down; |
| tmp_gw_factor *= 100 * 100; |
| tmp_gw_factor >>= 18; |
| |
| if (tmp_gw_factor > max_gw_factor || |
| (tmp_gw_factor == max_gw_factor && |
| tq_avg > max_tq)) { |
| if (curr_gw) |
| batadv_gw_node_put(curr_gw); |
| curr_gw = gw_node; |
| kref_get(&curr_gw->refcount); |
| } |
| break; |
| |
| default: /* 2: stable connection (use best statistic) |
| * 3: fast-switch (use best statistic but change as |
| * soon as a better gateway appears) |
| * XX: late-switch (use best statistic but change as |
| * soon as a better gateway appears which has |
| * $routing_class more tq points) |
| */ |
| if (tq_avg > max_tq) { |
| if (curr_gw) |
| batadv_gw_node_put(curr_gw); |
| curr_gw = gw_node; |
| kref_get(&curr_gw->refcount); |
| } |
| break; |
| } |
| |
| if (tq_avg > max_tq) |
| max_tq = tq_avg; |
| |
| if (tmp_gw_factor > max_gw_factor) |
| max_gw_factor = tmp_gw_factor; |
| |
| batadv_gw_node_put(gw_node); |
| |
| next: |
| batadv_neigh_node_put(router); |
| if (router_ifinfo) |
| batadv_neigh_ifinfo_put(router_ifinfo); |
| } |
| rcu_read_unlock(); |
| |
| return curr_gw; |
| } |
| |
| static bool batadv_iv_gw_is_eligible(struct batadv_priv *bat_priv, |
| struct batadv_orig_node *curr_gw_orig, |
| struct batadv_orig_node *orig_node) |
| { |
| struct batadv_neigh_ifinfo *router_orig_ifinfo = NULL; |
| struct batadv_neigh_ifinfo *router_gw_ifinfo = NULL; |
| struct batadv_neigh_node *router_gw = NULL; |
| struct batadv_neigh_node *router_orig = NULL; |
| u8 gw_tq_avg, orig_tq_avg; |
| bool ret = false; |
| |
| /* dynamic re-election is performed only on fast or late switch */ |
| if (atomic_read(&bat_priv->gw.sel_class) <= 2) |
| return false; |
| |
| router_gw = batadv_orig_router_get(curr_gw_orig, BATADV_IF_DEFAULT); |
| if (!router_gw) { |
| ret = true; |
| goto out; |
| } |
| |
| router_gw_ifinfo = batadv_neigh_ifinfo_get(router_gw, |
| BATADV_IF_DEFAULT); |
| if (!router_gw_ifinfo) { |
| ret = true; |
| goto out; |
| } |
| |
| router_orig = batadv_orig_router_get(orig_node, BATADV_IF_DEFAULT); |
| if (!router_orig) |
| goto out; |
| |
| router_orig_ifinfo = batadv_neigh_ifinfo_get(router_orig, |
| BATADV_IF_DEFAULT); |
| if (!router_orig_ifinfo) |
| goto out; |
| |
| gw_tq_avg = router_gw_ifinfo->bat_iv.tq_avg; |
| orig_tq_avg = router_orig_ifinfo->bat_iv.tq_avg; |
| |
| /* the TQ value has to be better */ |
| if (orig_tq_avg < gw_tq_avg) |
| goto out; |
| |
| /* if the routing class is greater than 3 the value tells us how much |
| * greater the TQ value of the new gateway must be |
| */ |
| if ((atomic_read(&bat_priv->gw.sel_class) > 3) && |
| (orig_tq_avg - gw_tq_avg < atomic_read(&bat_priv->gw.sel_class))) |
| goto out; |
| |
| batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| "Restarting gateway selection: better gateway found (tq curr: %i, tq new: %i)\n", |
| gw_tq_avg, orig_tq_avg); |
| |
| ret = true; |
| out: |
| if (router_gw_ifinfo) |
| batadv_neigh_ifinfo_put(router_gw_ifinfo); |
| if (router_orig_ifinfo) |
| batadv_neigh_ifinfo_put(router_orig_ifinfo); |
| if (router_gw) |
| batadv_neigh_node_put(router_gw); |
| if (router_orig) |
| batadv_neigh_node_put(router_orig); |
| |
| return ret; |
| } |
| |
| #ifdef CONFIG_BATMAN_ADV_DEBUGFS |
| /* fails if orig_node has no router */ |
| static int batadv_iv_gw_write_buffer_text(struct batadv_priv *bat_priv, |
| struct seq_file *seq, |
| const struct batadv_gw_node *gw_node) |
| { |
| struct batadv_gw_node *curr_gw; |
| struct batadv_neigh_node *router; |
| struct batadv_neigh_ifinfo *router_ifinfo = NULL; |
| int ret = -1; |
| |
| router = batadv_orig_router_get(gw_node->orig_node, BATADV_IF_DEFAULT); |
| if (!router) |
| goto out; |
| |
| router_ifinfo = batadv_neigh_ifinfo_get(router, BATADV_IF_DEFAULT); |
| if (!router_ifinfo) |
| goto out; |
| |
| curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
| |
| seq_printf(seq, "%s %pM (%3i) %pM [%10s]: %u.%u/%u.%u MBit\n", |
| (curr_gw == gw_node ? "=>" : " "), |
| gw_node->orig_node->orig, |
| router_ifinfo->bat_iv.tq_avg, router->addr, |
| router->if_incoming->net_dev->name, |
| gw_node->bandwidth_down / 10, |
| gw_node->bandwidth_down % 10, |
| gw_node->bandwidth_up / 10, |
| gw_node->bandwidth_up % 10); |
| ret = seq_has_overflowed(seq) ? -1 : 0; |
| |
| if (curr_gw) |
| batadv_gw_node_put(curr_gw); |
| out: |
| if (router_ifinfo) |
| batadv_neigh_ifinfo_put(router_ifinfo); |
| if (router) |
| batadv_neigh_node_put(router); |
| return ret; |
| } |
| |
| static void batadv_iv_gw_print(struct batadv_priv *bat_priv, |
| struct seq_file *seq) |
| { |
| struct batadv_gw_node *gw_node; |
| int gw_count = 0; |
| |
| seq_puts(seq, |
| " Gateway (#/255) Nexthop [outgoingIF]: advertised uplink bandwidth\n"); |
| |
| rcu_read_lock(); |
| hlist_for_each_entry_rcu(gw_node, &bat_priv->gw.gateway_list, list) { |
| /* fails if orig_node has no router */ |
| if (batadv_iv_gw_write_buffer_text(bat_priv, seq, gw_node) < 0) |
| continue; |
| |
| gw_count++; |
| } |
| rcu_read_unlock(); |
| |
| if (gw_count == 0) |
| seq_puts(seq, "No gateways in range ...\n"); |
| } |
| #endif |
| |
| /** |
| * batadv_iv_gw_dump_entry() - Dump a gateway into a message |
| * @msg: Netlink message to dump into |
| * @portid: Port making netlink request |
| * @seq: Sequence number of netlink message |
| * @bat_priv: The bat priv with all the soft interface information |
| * @gw_node: Gateway to be dumped |
| * |
| * Return: Error code, or 0 on success |
| */ |
| static int batadv_iv_gw_dump_entry(struct sk_buff *msg, u32 portid, u32 seq, |
| struct batadv_priv *bat_priv, |
| struct batadv_gw_node *gw_node) |
| { |
| struct batadv_neigh_ifinfo *router_ifinfo = NULL; |
| struct batadv_neigh_node *router; |
| struct batadv_gw_node *curr_gw = NULL; |
| int ret = 0; |
| void *hdr; |
| |
| router = batadv_orig_router_get(gw_node->orig_node, BATADV_IF_DEFAULT); |
| if (!router) |
| goto out; |
| |
| router_ifinfo = batadv_neigh_ifinfo_get(router, BATADV_IF_DEFAULT); |
| if (!router_ifinfo) |
| goto out; |
| |
| curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
| |
| hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family, |
| NLM_F_MULTI, BATADV_CMD_GET_GATEWAYS); |
| if (!hdr) { |
| ret = -ENOBUFS; |
| goto out; |
| } |
| |
| ret = -EMSGSIZE; |
| |
| if (curr_gw == gw_node) |
| if (nla_put_flag(msg, BATADV_ATTR_FLAG_BEST)) { |
| genlmsg_cancel(msg, hdr); |
| goto out; |
| } |
| |
| if (nla_put(msg, BATADV_ATTR_ORIG_ADDRESS, ETH_ALEN, |
| gw_node->orig_node->orig) || |
| nla_put_u8(msg, BATADV_ATTR_TQ, router_ifinfo->bat_iv.tq_avg) || |
| nla_put(msg, BATADV_ATTR_ROUTER, ETH_ALEN, |
| router->addr) || |
| nla_put_string(msg, BATADV_ATTR_HARD_IFNAME, |
| router->if_incoming->net_dev->name) || |
| nla_put_u32(msg, BATADV_ATTR_BANDWIDTH_DOWN, |
| gw_node->bandwidth_down) || |
| nla_put_u32(msg, BATADV_ATTR_BANDWIDTH_UP, |
| gw_node->bandwidth_up)) { |
| genlmsg_cancel(msg, hdr); |
| goto out; |
| } |
| |
| genlmsg_end(msg, hdr); |
| ret = 0; |
| |
| out: |
| if (curr_gw) |
| batadv_gw_node_put(curr_gw); |
| if (router_ifinfo) |
| batadv_neigh_ifinfo_put(router_ifinfo); |
| if (router) |
| batadv_neigh_node_put(router); |
| return ret; |
| } |
| |
| /** |
| * batadv_iv_gw_dump() - Dump gateways into a message |
| * @msg: Netlink message to dump into |
| * @cb: Control block containing additional options |
| * @bat_priv: The bat priv with all the soft interface information |
| */ |
| static void batadv_iv_gw_dump(struct sk_buff *msg, struct netlink_callback *cb, |
| struct batadv_priv *bat_priv) |
| { |
| int portid = NETLINK_CB(cb->skb).portid; |
| struct batadv_gw_node *gw_node; |
| int idx_skip = cb->args[0]; |
| int idx = 0; |
| |
| rcu_read_lock(); |
| hlist_for_each_entry_rcu(gw_node, &bat_priv->gw.gateway_list, list) { |
| if (idx++ < idx_skip) |
| continue; |
| |
| if (batadv_iv_gw_dump_entry(msg, portid, cb->nlh->nlmsg_seq, |
| bat_priv, gw_node)) { |
| idx_skip = idx - 1; |
| goto unlock; |
| } |
| } |
| |
| idx_skip = idx; |
| unlock: |
| rcu_read_unlock(); |
| |
| cb->args[0] = idx_skip; |
| } |
| |
| static struct batadv_algo_ops batadv_batman_iv __read_mostly = { |
| .name = "BATMAN_IV", |
| .iface = { |
| .activate = batadv_iv_iface_activate, |
| .enable = batadv_iv_ogm_iface_enable, |
| .disable = batadv_iv_ogm_iface_disable, |
| .update_mac = batadv_iv_ogm_iface_update_mac, |
| .primary_set = batadv_iv_ogm_primary_iface_set, |
| }, |
| .neigh = { |
| .cmp = batadv_iv_ogm_neigh_cmp, |
| .is_similar_or_better = batadv_iv_ogm_neigh_is_sob, |
| #ifdef CONFIG_BATMAN_ADV_DEBUGFS |
| .print = batadv_iv_neigh_print, |
| #endif |
| .dump = batadv_iv_ogm_neigh_dump, |
| }, |
| .orig = { |
| #ifdef CONFIG_BATMAN_ADV_DEBUGFS |
| .print = batadv_iv_ogm_orig_print, |
| #endif |
| .dump = batadv_iv_ogm_orig_dump, |
| .free = batadv_iv_ogm_orig_free, |
| .add_if = batadv_iv_ogm_orig_add_if, |
| .del_if = batadv_iv_ogm_orig_del_if, |
| }, |
| .gw = { |
| .init_sel_class = batadv_iv_init_sel_class, |
| .get_best_gw_node = batadv_iv_gw_get_best_gw_node, |
| .is_eligible = batadv_iv_gw_is_eligible, |
| #ifdef CONFIG_BATMAN_ADV_DEBUGFS |
| .print = batadv_iv_gw_print, |
| #endif |
| .dump = batadv_iv_gw_dump, |
| }, |
| }; |
| |
| /** |
| * batadv_iv_init() - B.A.T.M.A.N. IV initialization function |
| * |
| * Return: 0 on success or negative error number in case of failure |
| */ |
| int __init batadv_iv_init(void) |
| { |
| int ret; |
| |
| /* batman originator packet */ |
| ret = batadv_recv_handler_register(BATADV_IV_OGM, |
| batadv_iv_ogm_receive); |
| if (ret < 0) |
| goto out; |
| |
| ret = batadv_algo_register(&batadv_batman_iv); |
| if (ret < 0) |
| goto handler_unregister; |
| |
| goto out; |
| |
| handler_unregister: |
| batadv_recv_handler_unregister(BATADV_IV_OGM); |
| out: |
| return ret; |
| } |
