1 // SPDX-License-Identifier: GPL-2.0
7 #include "mesh-interface.h"
45 #include "distributed-arp-table.h"
47 #include "hard-interface.h"
49 #include "network-coding.h"
51 #include "translation-table.h"
54  * batadv_skb_head_push() - Increase header size and move (push) head pointer
64 	/* TODO: We must check if we can release all references to non-payload  in batadv_skb_head_push()
67 	 * or write any data which is before the current position of skb->data  in batadv_skb_head_push()
80  * batadv_sum_counter() - Sum the cpu-local counters for index 'idx'
84  * Return: sum of all cpu-local counters
92 		counters = per_cpu_ptr(bat_priv->bat_counters, cpu);  in batadv_sum_counter()
102 	struct net_device_stats *stats = &dev->stats;  in batadv_interface_stats()
104 	stats->tx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_TX);  in batadv_interface_stats()
105 	stats->tx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_TX_BYTES);  in batadv_interface_stats()
106 	stats->tx_dropped = batadv_sum_counter(bat_priv, BATADV_CNT_TX_DROPPED);  in batadv_interface_stats()
107 	stats->rx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_RX);  in batadv_interface_stats()
108 	stats->rx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_RX_BYTES);  in batadv_interface_stats()
119 	if (!is_valid_ether_addr(addr->sa_data))  in batadv_interface_set_mac_addr()
120 		return -EADDRNOTAVAIL;  in batadv_interface_set_mac_addr()
122 	ether_addr_copy(old_addr, dev->dev_addr);  in batadv_interface_set_mac_addr()
123 	eth_hw_addr_set(dev, addr->sa_data);  in batadv_interface_set_mac_addr()
126 	if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)  in batadv_interface_set_mac_addr()
130 	hlist_for_each_entry_rcu(vlan, &bat_priv->meshif_vlan_list, list) {  in batadv_interface_set_mac_addr()
131 		batadv_tt_local_remove(bat_priv, old_addr, vlan->vid,  in batadv_interface_set_mac_addr()
133 		batadv_tt_local_add(dev, addr->sa_data, vlan->vid,  in batadv_interface_set_mac_addr()
147 		return -EINVAL;  in batadv_interface_change_mtu()
149 	WRITE_ONCE(dev->mtu, new_mtu);  in batadv_interface_change_mtu()
150 	bat_priv->mtu_set_by_user = new_mtu;  in batadv_interface_change_mtu()
156  * batadv_interface_set_rx_mode() - set the rx mode of a device
182 	int data_len = skb->len, ret;  in batadv_interface_tx()
193 	if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)  in batadv_interface_tx()
197 	memset(skb->cb, 0, sizeof(struct batadv_skb_cb));  in batadv_interface_tx()
205 	proto = ethhdr->h_proto;  in batadv_interface_tx()
212 		proto = vhdr->h_vlan_encapsulated_proto;  in batadv_interface_tx()
214 		/* drop batman-in-batman packets to prevent loops */  in batadv_interface_tx()
230 	/* skb->data might have been reallocated by batadv_bla_tx() */  in batadv_interface_tx()
234 	if (!is_multicast_ether_addr(ethhdr->h_source) &&  in batadv_interface_tx()
235 	    !batadv_bla_is_loopdetect_mac(ethhdr->h_source)) {  in batadv_interface_tx()
236 		client_added = batadv_tt_local_add(mesh_iface, ethhdr->h_source,  in batadv_interface_tx()
237 						   vid, skb->skb_iif,  in batadv_interface_tx()
238 						   skb->mark);  in batadv_interface_tx()
252 	if (batadv_compare_eth(ethhdr->h_dest, stp_addr))  in batadv_interface_tx()
255 	if (batadv_compare_eth(ethhdr->h_dest, ectp_addr))  in batadv_interface_tx()
258 	gw_mode = atomic_read(&bat_priv->gw.mode);  in batadv_interface_tx()
259 	if (is_multicast_ether_addr(ethhdr->h_dest)) {  in batadv_interface_tx()
268 		/* skb->data may have been modified by  in batadv_interface_tx()
272 		/* if gw_mode is on, broadcast any non-DHCP message.  in batadv_interface_tx()
290 		if (do_bcast && !is_broadcast_ether_addr(ethhdr->h_dest)) {  in batadv_interface_tx()
326 		bcast_packet = (struct batadv_bcast_packet *)skb->data;  in batadv_interface_tx()
327 		bcast_packet->version = BATADV_COMPAT_VERSION;  in batadv_interface_tx()
328 		bcast_packet->ttl = BATADV_TTL - 1;  in batadv_interface_tx()
331 		bcast_packet->packet_type = BATADV_BCAST;  in batadv_interface_tx()
332 		bcast_packet->reserved = 0;  in batadv_interface_tx()
337 		ether_addr_copy(bcast_packet->orig,  in batadv_interface_tx()
338 				primary_if->net_dev->dev_addr);  in batadv_interface_tx()
341 		seqno = atomic_inc_return(&bat_priv->bcast_seqno);  in batadv_interface_tx()
342 		bcast_packet->seqno = htonl(seqno);  in batadv_interface_tx()
386  * batadv_interface_rx() - receive ethernet frame on local batman-adv interface
389  * @hdr_size: size of already parsed batman-adv header
390  * @orig_node: originator from which the batman-adv packet was sent
393  * skb->data has still point to the batman-adv header with the size @hdr_size.
398  * ethernet frame is invalid or contains again an batman-adv packet. Also
413 	batadv_bcast_packet = (struct batadv_bcast_packet *)skb->data;  in batadv_interface_rx()
414 	packet_type = batadv_bcast_packet->packet_type;  in batadv_interface_rx()
419 	/* clean the netfilter state now that the batman-adv header has been  in batadv_interface_rx()
430 	switch (ntohs(ethhdr->h_proto)) {  in batadv_interface_rx()
437 		/* drop batman-in-batman packets to prevent loops */  in batadv_interface_rx()
438 		if (vhdr->h_vlan_encapsulated_proto != htons(ETH_P_BATMAN))  in batadv_interface_rx()
446 	/* skb->dev & skb->pkt_type are set here */  in batadv_interface_rx()
447 	skb->protocol = eth_type_trans(skb, mesh_iface);  in batadv_interface_rx()
452 			   skb->len + ETH_HLEN);  in batadv_interface_rx()
462 						     ethhdr->h_source, vid);  in batadv_interface_rx()
464 	if (is_multicast_ether_addr(ethhdr->h_dest)) {  in batadv_interface_rx()
469 		    batadv_tt_global_is_isolated(bat_priv, ethhdr->h_source,  in batadv_interface_rx()
471 			/* save bits in skb->mark not covered by the mask and  in batadv_interface_rx()
474 			skb->mark &= ~bat_priv->isolation_mark_mask;  in batadv_interface_rx()
475 			skb->mark |= bat_priv->isolation_mark;  in batadv_interface_rx()
477 	} else if (batadv_is_ap_isolated(bat_priv, ethhdr->h_source,  in batadv_interface_rx()
478 					 ethhdr->h_dest, vid)) {  in batadv_interface_rx()
492  * batadv_meshif_vlan_release() - release vlan from lists and queue for free
502 	spin_lock_bh(&vlan->bat_priv->meshif_vlan_list_lock);  in batadv_meshif_vlan_release()
503 	hlist_del_rcu(&vlan->list);  in batadv_meshif_vlan_release()
504 	spin_unlock_bh(&vlan->bat_priv->meshif_vlan_list_lock);  in batadv_meshif_vlan_release()
510  * batadv_meshif_vlan_get() - get the vlan object for a specific vid
523 	hlist_for_each_entry_rcu(vlan_tmp, &bat_priv->meshif_vlan_list, list) {  in batadv_meshif_vlan_get()
524 		if (vlan_tmp->vid != vid)  in batadv_meshif_vlan_get()
527 		if (!kref_get_unless_zero(&vlan_tmp->refcount))  in batadv_meshif_vlan_get()
539  * batadv_meshif_create_vlan() - allocate the needed resources for a new vlan
549 	spin_lock_bh(&bat_priv->meshif_vlan_list_lock);  in batadv_meshif_create_vlan()
554 		spin_unlock_bh(&bat_priv->meshif_vlan_list_lock);  in batadv_meshif_create_vlan()
555 		return -EEXIST;  in batadv_meshif_create_vlan()
560 		spin_unlock_bh(&bat_priv->meshif_vlan_list_lock);  in batadv_meshif_create_vlan()
561 		return -ENOMEM;  in batadv_meshif_create_vlan()
564 	vlan->bat_priv = bat_priv;  in batadv_meshif_create_vlan()
565 	vlan->vid = vid;  in batadv_meshif_create_vlan()
566 	kref_init(&vlan->refcount);  in batadv_meshif_create_vlan()
568 	atomic_set(&vlan->ap_isolation, 0);  in batadv_meshif_create_vlan()
570 	kref_get(&vlan->refcount);  in batadv_meshif_create_vlan()
571 	hlist_add_head_rcu(&vlan->list, &bat_priv->meshif_vlan_list);  in batadv_meshif_create_vlan()
572 	spin_unlock_bh(&bat_priv->meshif_vlan_list_lock);  in batadv_meshif_create_vlan()
577 	batadv_tt_local_add(bat_priv->mesh_iface,  in batadv_meshif_create_vlan()
578 			    bat_priv->mesh_iface->dev_addr, vid,  in batadv_meshif_create_vlan()
588  * batadv_meshif_destroy_vlan() - remove and destroy a meshif_vlan object
598 	batadv_tt_local_remove(bat_priv, bat_priv->mesh_iface->dev_addr,  in batadv_meshif_destroy_vlan()
599 			       vlan->vid, "vlan interface destroyed", false);  in batadv_meshif_destroy_vlan()
605  * batadv_interface_add_vid() - ndo_add_vid API implementation
622 	 * batman-adv does not know how to handle other types  in batadv_interface_add_vid()
625 		return -EINVAL;  in batadv_interface_add_vid()
627 	/* VID 0 is only used to indicate "priority tag" frames which only  in batadv_interface_add_vid()
651 	batadv_tt_local_add(bat_priv->mesh_iface,  in batadv_interface_add_vid()
652 			    bat_priv->mesh_iface->dev_addr, vid,  in batadv_interface_add_vid()
659  * batadv_interface_kill_vid() - ndo_kill_vid API implementation
667  * Return: 0 on success, -EINVAL if the specified prototype is not ETH_P_8021Q
668  * or -ENOENT if the specified vlan id wasn't registered.
676 	/* only 802.1Q vlans are supported. batman-adv does not know how to  in batadv_interface_kill_vid()
680 		return -EINVAL;  in batadv_interface_kill_vid()
682 	/* "priority tag" frames are handled like "untagged" frames  in batadv_interface_kill_vid()
690 		return -ENOENT;  in batadv_interface_kill_vid()
700 /* batman-adv network devices have devices nesting below it and are a special
701  * "super class" of normal network devices; split their locks off into a
708  * batadv_set_lockdep_class_one() - Set lockdep class for a single tx queue
717 	lockdep_set_class(&txq->_xmit_lock, &batadv_netdev_xmit_lock_key);  in batadv_set_lockdep_class_one()
721  * batadv_set_lockdep_class() - Set txq and addr_list lockdep class
726 	lockdep_set_class(&dev->addr_list_lock, &batadv_netdev_addr_lock_key);  in batadv_set_lockdep_class()
731  * batadv_meshif_init_late() - late stage initialization of mesh interface
746 	bat_priv->mesh_iface = dev;  in batadv_meshif_init_late()
751 	bat_priv->bat_counters = __alloc_percpu(cnt_len, __alignof__(u64));  in batadv_meshif_init_late()
752 	if (!bat_priv->bat_counters)  in batadv_meshif_init_late()
753 		return -ENOMEM;  in batadv_meshif_init_late()
755 	atomic_set(&bat_priv->aggregated_ogms, 1);  in batadv_meshif_init_late()
756 	atomic_set(&bat_priv->bonding, 0);  in batadv_meshif_init_late()
758 	atomic_set(&bat_priv->bridge_loop_avoidance, 1);  in batadv_meshif_init_late()
761 	atomic_set(&bat_priv->distributed_arp_table, 1);  in batadv_meshif_init_late()
764 	atomic_set(&bat_priv->multicast_mode, 1);  in batadv_meshif_init_late()
765 	atomic_set(&bat_priv->multicast_fanout, 16);  in batadv_meshif_init_late()
766 	atomic_set(&bat_priv->mcast.num_want_all_unsnoopables, 0);  in batadv_meshif_init_late()
767 	atomic_set(&bat_priv->mcast.num_want_all_ipv4, 0);  in batadv_meshif_init_late()
768 	atomic_set(&bat_priv->mcast.num_want_all_ipv6, 0);  in batadv_meshif_init_late()
769 	atomic_set(&bat_priv->mcast.num_no_mc_ptype_capa, 0);  in batadv_meshif_init_late()
771 	atomic_set(&bat_priv->gw.mode, BATADV_GW_MODE_OFF);  in batadv_meshif_init_late()
772 	atomic_set(&bat_priv->gw.bandwidth_down, 100);  in batadv_meshif_init_late()
773 	atomic_set(&bat_priv->gw.bandwidth_up, 20);  in batadv_meshif_init_late()
774 	atomic_set(&bat_priv->orig_interval, 1000);  in batadv_meshif_init_late()
775 	atomic_set(&bat_priv->hop_penalty, 30);  in batadv_meshif_init_late()
777 	atomic_set(&bat_priv->log_level, 0);  in batadv_meshif_init_late()
779 	atomic_set(&bat_priv->fragmentation, 1);  in batadv_meshif_init_late()
780 	atomic_set(&bat_priv->packet_size_max, BATADV_MAX_MTU);  in batadv_meshif_init_late()
781 	atomic_set(&bat_priv->bcast_queue_left, BATADV_BCAST_QUEUE_LEN);  in batadv_meshif_init_late()
782 	atomic_set(&bat_priv->batman_queue_left, BATADV_BATMAN_QUEUE_LEN);  in batadv_meshif_init_late()
784 	atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE);  in batadv_meshif_init_late()
785 	atomic_set(&bat_priv->bcast_seqno, 1);  in batadv_meshif_init_late()
786 	atomic_set(&bat_priv->tt.vn, 0);  in batadv_meshif_init_late()
787 	atomic_set(&bat_priv->tt.ogm_append_cnt, 0);  in batadv_meshif_init_late()
789 	atomic_set(&bat_priv->bla.num_requests, 0);  in batadv_meshif_init_late()
791 	atomic_set(&bat_priv->tp_num, 0);  in batadv_meshif_init_late()
793 	WRITE_ONCE(bat_priv->tt.local_changes, 0);  in batadv_meshif_init_late()
794 	bat_priv->tt.last_changeset = NULL;  in batadv_meshif_init_late()
795 	bat_priv->tt.last_changeset_len = 0;  in batadv_meshif_init_late()
796 	bat_priv->isolation_mark = 0;  in batadv_meshif_init_late()
797 	bat_priv->isolation_mark_mask = 0;  in batadv_meshif_init_late()
801 	atomic_set(&bat_priv->frag_seqno, random_seqno);  in batadv_meshif_init_late()
803 	bat_priv->primary_if = NULL;  in batadv_meshif_init_late()
807 	if (!bat_priv->algo_ops) {  in batadv_meshif_init_late()
820 	free_percpu(bat_priv->bat_counters);  in batadv_meshif_init_late()
821 	bat_priv->bat_counters = NULL;  in batadv_meshif_init_late()
827  * batadv_meshif_slave_add() - Add a slave interface to a batadv_mesh_interface
839 	int ret = -EINVAL;  in batadv_meshif_slave_add()
842 	if (!hard_iface || hard_iface->mesh_iface)  in batadv_meshif_slave_add()
853  * batadv_meshif_slave_del() - Delete a slave iface from a batadv_mesh_interface
863 	int ret = -EINVAL;  in batadv_meshif_slave_del()
867 	if (!hard_iface || hard_iface->mesh_iface != dev)  in batadv_meshif_slave_del()
895 	strscpy(info->driver, "B.A.T.M.A.N. advanced", sizeof(info->driver));  in batadv_get_drvinfo()
896 	strscpy(info->version, BATADV_SOURCE_VERSION, sizeof(info->version));  in batadv_get_drvinfo()
897 	strscpy(info->fw_version, "N/A", sizeof(info->fw_version));  in batadv_get_drvinfo()
898 	strscpy(info->bus_info, "batman", sizeof(info->bus_info));  in batadv_get_drvinfo()
985 	return -EOPNOTSUPP;  in batadv_get_sset_count()
997  * batadv_meshif_free() - Deconstructor of batadv_mesh_interface
1012  * batadv_meshif_init_early() - early stage initialization of mesh interface
1019 	dev->netdev_ops = &batadv_netdev_ops;  in batadv_meshif_init_early()
1020 	dev->needs_free_netdev = true;  in batadv_meshif_init_early()
1021 	dev->priv_destructor = batadv_meshif_free;  in batadv_meshif_init_early()
1022 	dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;  in batadv_meshif_init_early()
1023 	dev->priv_flags |= IFF_NO_QUEUE;  in batadv_meshif_init_early()
1024 	dev->lltx = true;  in batadv_meshif_init_early()
1025 	dev->netns_immutable = true;  in batadv_meshif_init_early()
1030 	dev->mtu = ETH_DATA_LEN;  in batadv_meshif_init_early()
1031 	dev->max_mtu = BATADV_MAX_MTU;  in batadv_meshif_init_early()
1036 	dev->ethtool_ops = &batadv_ethtool_ops;  in batadv_meshif_init_early()
1040  * batadv_meshif_validate() - validate configuration of new batadv link
1058 			return -EINVAL;  in batadv_meshif_validate()
1065  * batadv_meshif_newlink() - pre-initialize and register new batadv link
1077 	struct nlattr **data = params->data;  in batadv_meshif_newlink()
1085 			return -EINVAL;  in batadv_meshif_newlink()
1092  * batadv_meshif_destroy_netlink() - deletion of batadv_mesh_interface via
1094  * @mesh_iface: the to-be-removed batman-adv interface
1104 	while (!list_empty(&mesh_iface->adj_list.lower)) {  in batadv_meshif_destroy_netlink()
1105 		hard_iface = netdev_adjacent_get_private(mesh_iface->adj_list.lower.next);  in batadv_meshif_destroy_netlink()
1120  * batadv_meshif_is_valid() - Check whether device is a batadv mesh interface
1123  * Return: true when net_dev is a batman-adv interface, false otherwise
1127 	if (net_dev->netdev_ops->ndo_start_xmit == batadv_interface_tx)  in batadv_meshif_is_valid()