net/batman-adv/soft-interface.c

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This source file includes following definitions.
batadv_skb_head_push
batadv_interface_open
batadv_interface_release
batadv_sum_counter
batadv_interface_stats
batadv_interface_set_mac_addr
batadv_interface_change_mtu
batadv_interface_set_rx_mode
batadv_interface_tx
batadv_interface_rx
batadv_softif_vlan_release
batadv_softif_vlan_put
batadv_softif_vlan_get
batadv_softif_create_vlan
batadv_softif_destroy_vlan
batadv_interface_add_vid
batadv_interface_kill_vid
batadv_softif_init_late
batadv_softif_slave_add
batadv_softif_slave_del
batadv_get_drvinfo
batadv_get_strings
batadv_get_ethtool_stats
batadv_get_sset_count
batadv_softif_free
batadv_softif_init_early
batadv_softif_create
batadv_softif_destroy_sysfs
batadv_softif_destroy_netlink
batadv_softif_is_valid
   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright (C) 2007-2019  B.A.T.M.A.N. contributors:
   3  *
   4  * Marek Lindner, Simon Wunderlich
   5  */
   6 
   7 #include "soft-interface.h"
   8 #include "main.h"
   9 
  10 #include <linux/atomic.h>
  11 #include <linux/byteorder/generic.h>
  12 #include <linux/cache.h>
  13 #include <linux/compiler.h>
  14 #include <linux/cpumask.h>
  15 #include <linux/errno.h>
  16 #include <linux/etherdevice.h>
  17 #include <linux/ethtool.h>
  18 #include <linux/gfp.h>
  19 #include <linux/if_ether.h>
  20 #include <linux/if_vlan.h>
  21 #include <linux/jiffies.h>
  22 #include <linux/kernel.h>
  23 #include <linux/kref.h>
  24 #include <linux/list.h>
  25 #include <linux/lockdep.h>
  26 #include <linux/netdevice.h>
  27 #include <linux/netlink.h>
  28 #include <linux/percpu.h>
  29 #include <linux/printk.h>
  30 #include <linux/random.h>
  31 #include <linux/rculist.h>
  32 #include <linux/rcupdate.h>
  33 #include <linux/rtnetlink.h>
  34 #include <linux/skbuff.h>
  35 #include <linux/slab.h>
  36 #include <linux/socket.h>
  37 #include <linux/spinlock.h>
  38 #include <linux/stddef.h>
  39 #include <linux/string.h>
  40 #include <linux/types.h>
  41 #include <uapi/linux/batadv_packet.h>
  42 #include <uapi/linux/batman_adv.h>
  43 
  44 #include "bat_algo.h"
  45 #include "bridge_loop_avoidance.h"
  46 #include "debugfs.h"
  47 #include "distributed-arp-table.h"
  48 #include "gateway_client.h"
  49 #include "hard-interface.h"
  50 #include "multicast.h"
  51 #include "network-coding.h"
  52 #include "originator.h"
  53 #include "send.h"
  54 #include "sysfs.h"
  55 #include "translation-table.h"
  56 
  57 /**
  58  * batadv_skb_head_push() - Increase header size and move (push) head pointer
  59  * @skb: packet buffer which should be modified
  60  * @len: number of bytes to add
  61  *
  62  * Return: 0 on success or negative error number in case of failure
  63  */
  64 int batadv_skb_head_push(struct sk_buff *skb, unsigned int len)
  65 {
  66         int result;
  67 
  68         /* TODO: We must check if we can release all references to non-payload
  69          * data using __skb_header_release in our skbs to allow skb_cow_header
  70          * to work optimally. This means that those skbs are not allowed to read
  71          * or write any data which is before the current position of skb->data
  72          * after that call and thus allow other skbs with the same data buffer
  73          * to write freely in that area.
  74          */
  75         result = skb_cow_head(skb, len);
  76         if (result < 0)
  77                 return result;
  78 
  79         skb_push(skb, len);
  80         return 0;
  81 }
  82 
  83 static int batadv_interface_open(struct net_device *dev)
  84 {
  85         netif_start_queue(dev);
  86         return 0;
  87 }
  88 
  89 static int batadv_interface_release(struct net_device *dev)
  90 {
  91         netif_stop_queue(dev);
  92         return 0;
  93 }
  94 
  95 /**
  96  * batadv_sum_counter() - Sum the cpu-local counters for index 'idx'
  97  * @bat_priv: the bat priv with all the soft interface information
  98  * @idx: index of counter to sum up
  99  *
 100  * Return: sum of all cpu-local counters
 101  */
 102 static u64 batadv_sum_counter(struct batadv_priv *bat_priv,  size_t idx)
 103 {
 104         u64 *counters, sum = 0;
 105         int cpu;
 106 
 107         for_each_possible_cpu(cpu) {
 108                 counters = per_cpu_ptr(bat_priv->bat_counters, cpu);
 109                 sum += counters[idx];
 110         }
 111 
 112         return sum;
 113 }
 114 
 115 static struct net_device_stats *batadv_interface_stats(struct net_device *dev)
 116 {
 117         struct batadv_priv *bat_priv = netdev_priv(dev);
 118         struct net_device_stats *stats = &dev->stats;
 119 
 120         stats->tx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_TX);
 121         stats->tx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_TX_BYTES);
 122         stats->tx_dropped = batadv_sum_counter(bat_priv, BATADV_CNT_TX_DROPPED);
 123         stats->rx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_RX);
 124         stats->rx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_RX_BYTES);
 125         return stats;
 126 }
 127 
 128 static int batadv_interface_set_mac_addr(struct net_device *dev, void *p)
 129 {
 130         struct batadv_priv *bat_priv = netdev_priv(dev);
 131         struct batadv_softif_vlan *vlan;
 132         struct sockaddr *addr = p;
 133         u8 old_addr[ETH_ALEN];
 134 
 135         if (!is_valid_ether_addr(addr->sa_data))
 136                 return -EADDRNOTAVAIL;
 137 
 138         ether_addr_copy(old_addr, dev->dev_addr);
 139         ether_addr_copy(dev->dev_addr, addr->sa_data);
 140 
 141         /* only modify transtable if it has been initialized before */
 142         if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
 143                 return 0;
 144 
 145         rcu_read_lock();
 146         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
 147                 batadv_tt_local_remove(bat_priv, old_addr, vlan->vid,
 148                                        "mac address changed", false);
 149                 batadv_tt_local_add(dev, addr->sa_data, vlan->vid,
 150                                     BATADV_NULL_IFINDEX, BATADV_NO_MARK);
 151         }
 152         rcu_read_unlock();
 153 
 154         return 0;
 155 }
 156 
 157 static int batadv_interface_change_mtu(struct net_device *dev, int new_mtu)
 158 {
 159         /* check ranges */
 160         if (new_mtu < 68 || new_mtu > batadv_hardif_min_mtu(dev))
 161                 return -EINVAL;
 162 
 163         dev->mtu = new_mtu;
 164 
 165         return 0;
 166 }
 167 
 168 /**
 169  * batadv_interface_set_rx_mode() - set the rx mode of a device
 170  * @dev: registered network device to modify
 171  *
 172  * We do not actually need to set any rx filters for the virtual batman
 173  * soft interface. However a dummy handler enables a user to set static
 174  * multicast listeners for instance.
 175  */
 176 static void batadv_interface_set_rx_mode(struct net_device *dev)
 177 {
 178 }
 179 
 180 static netdev_tx_t batadv_interface_tx(struct sk_buff *skb,
 181                                        struct net_device *soft_iface)
 182 {
 183         struct ethhdr *ethhdr;
 184         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
 185         struct batadv_hard_iface *primary_if = NULL;
 186         struct batadv_bcast_packet *bcast_packet;
 187         static const u8 stp_addr[ETH_ALEN] = {0x01, 0x80, 0xC2, 0x00,
 188                                               0x00, 0x00};
 189         static const u8 ectp_addr[ETH_ALEN] = {0xCF, 0x00, 0x00, 0x00,
 190                                                0x00, 0x00};
 191         enum batadv_dhcp_recipient dhcp_rcp = BATADV_DHCP_NO;
 192         u8 *dst_hint = NULL, chaddr[ETH_ALEN];
 193         struct vlan_ethhdr *vhdr;
 194         unsigned int header_len = 0;
 195         int data_len = skb->len, ret;
 196         unsigned long brd_delay = 1;
 197         bool do_bcast = false, client_added;
 198         unsigned short vid;
 199         u32 seqno;
 200         int gw_mode;
 201         enum batadv_forw_mode forw_mode = BATADV_FORW_SINGLE;
 202         struct batadv_orig_node *mcast_single_orig = NULL;
 203         int network_offset = ETH_HLEN;
 204         __be16 proto;
 205 
 206         if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
 207                 goto dropped;
 208 
 209         /* reset control block to avoid left overs from previous users */
 210         memset(skb->cb, 0, sizeof(struct batadv_skb_cb));
 211 
 212         netif_trans_update(soft_iface);
 213         vid = batadv_get_vid(skb, 0);
 214 
 215         skb_reset_mac_header(skb);
 216         ethhdr = eth_hdr(skb);
 217 
 218         proto = ethhdr->h_proto;
 219 
 220         switch (ntohs(proto)) {
 221         case ETH_P_8021Q:
 222                 if (!pskb_may_pull(skb, sizeof(*vhdr)))
 223                         goto dropped;
 224                 vhdr = vlan_eth_hdr(skb);
 225                 proto = vhdr->h_vlan_encapsulated_proto;
 226 
 227                 /* drop batman-in-batman packets to prevent loops */
 228                 if (proto != htons(ETH_P_BATMAN)) {
 229                         network_offset += VLAN_HLEN;
 230                         break;
 231                 }
 232 
 233                 /* fall through */
 234         case ETH_P_BATMAN:
 235                 goto dropped;
 236         }
 237 
 238         skb_set_network_header(skb, network_offset);
 239 
 240         if (batadv_bla_tx(bat_priv, skb, vid))
 241                 goto dropped;
 242 
 243         /* skb->data might have been reallocated by batadv_bla_tx() */
 244         ethhdr = eth_hdr(skb);
 245 
 246         /* Register the client MAC in the transtable */
 247         if (!is_multicast_ether_addr(ethhdr->h_source) &&
 248             !batadv_bla_is_loopdetect_mac(ethhdr->h_source)) {
 249                 client_added = batadv_tt_local_add(soft_iface, ethhdr->h_source,
 250                                                    vid, skb->skb_iif,
 251                                                    skb->mark);
 252                 if (!client_added)
 253                         goto dropped;
 254         }
 255 
 256         /* Snoop address candidates from DHCPACKs for early DAT filling */
 257         batadv_dat_snoop_outgoing_dhcp_ack(bat_priv, skb, proto, vid);
 258 
 259         /* don't accept stp packets. STP does not help in meshes.
 260          * better use the bridge loop avoidance ...
 261          *
 262          * The same goes for ECTP sent at least by some Cisco Switches,
 263          * it might confuse the mesh when used with bridge loop avoidance.
 264          */
 265         if (batadv_compare_eth(ethhdr->h_dest, stp_addr))
 266                 goto dropped;
 267 
 268         if (batadv_compare_eth(ethhdr->h_dest, ectp_addr))
 269                 goto dropped;
 270 
 271         gw_mode = atomic_read(&bat_priv->gw.mode);
 272         if (is_multicast_ether_addr(ethhdr->h_dest)) {
 273                 /* if gw mode is off, broadcast every packet */
 274                 if (gw_mode == BATADV_GW_MODE_OFF) {
 275                         do_bcast = true;
 276                         goto send;
 277                 }
 278 
 279                 dhcp_rcp = batadv_gw_dhcp_recipient_get(skb, &header_len,
 280                                                         chaddr);
 281                 /* skb->data may have been modified by
 282                  * batadv_gw_dhcp_recipient_get()
 283                  */
 284                 ethhdr = eth_hdr(skb);
 285                 /* if gw_mode is on, broadcast any non-DHCP message.
 286                  * All the DHCP packets are going to be sent as unicast
 287                  */
 288                 if (dhcp_rcp == BATADV_DHCP_NO) {
 289                         do_bcast = true;
 290                         goto send;
 291                 }
 292 
 293                 if (dhcp_rcp == BATADV_DHCP_TO_CLIENT)
 294                         dst_hint = chaddr;
 295                 else if ((gw_mode == BATADV_GW_MODE_SERVER) &&
 296                          (dhcp_rcp == BATADV_DHCP_TO_SERVER))
 297                         /* gateways should not forward any DHCP message if
 298                          * directed to a DHCP server
 299                          */
 300                         goto dropped;
 301 
 302 send:
 303                 if (do_bcast && !is_broadcast_ether_addr(ethhdr->h_dest)) {
 304                         forw_mode = batadv_mcast_forw_mode(bat_priv, skb,
 305                                                            &mcast_single_orig);
 306                         if (forw_mode == BATADV_FORW_NONE)
 307                                 goto dropped;
 308 
 309                         if (forw_mode == BATADV_FORW_SINGLE ||
 310                             forw_mode == BATADV_FORW_SOME)
 311                                 do_bcast = false;
 312                 }
 313         }
 314 
 315         batadv_skb_set_priority(skb, 0);
 316 
 317         /* ethernet packet should be broadcasted */
 318         if (do_bcast) {
 319                 primary_if = batadv_primary_if_get_selected(bat_priv);
 320                 if (!primary_if)
 321                         goto dropped;
 322 
 323                 /* in case of ARP request, we do not immediately broadcasti the
 324                  * packet, instead we first wait for DAT to try to retrieve the
 325                  * correct ARP entry
 326                  */
 327                 if (batadv_dat_snoop_outgoing_arp_request(bat_priv, skb))
 328                         brd_delay = msecs_to_jiffies(ARP_REQ_DELAY);
 329 
 330                 if (batadv_skb_head_push(skb, sizeof(*bcast_packet)) < 0)
 331                         goto dropped;
 332 
 333                 bcast_packet = (struct batadv_bcast_packet *)skb->data;
 334                 bcast_packet->version = BATADV_COMPAT_VERSION;
 335                 bcast_packet->ttl = BATADV_TTL;
 336 
 337                 /* batman packet type: broadcast */
 338                 bcast_packet->packet_type = BATADV_BCAST;
 339                 bcast_packet->reserved = 0;
 340 
 341                 /* hw address of first interface is the orig mac because only
 342                  * this mac is known throughout the mesh
 343                  */
 344                 ether_addr_copy(bcast_packet->orig,
 345                                 primary_if->net_dev->dev_addr);
 346 
 347                 /* set broadcast sequence number */
 348                 seqno = atomic_inc_return(&bat_priv->bcast_seqno);
 349                 bcast_packet->seqno = htonl(seqno);
 350 
 351                 batadv_add_bcast_packet_to_list(bat_priv, skb, brd_delay, true);
 352 
 353                 /* a copy is stored in the bcast list, therefore removing
 354                  * the original skb.
 355                  */
 356                 consume_skb(skb);
 357 
 358         /* unicast packet */
 359         } else {
 360                 /* DHCP packets going to a server will use the GW feature */
 361                 if (dhcp_rcp == BATADV_DHCP_TO_SERVER) {
 362                         ret = batadv_gw_out_of_range(bat_priv, skb);
 363                         if (ret)
 364                                 goto dropped;
 365                         ret = batadv_send_skb_via_gw(bat_priv, skb, vid);
 366                 } else if (mcast_single_orig) {
 367                         ret = batadv_send_skb_unicast(bat_priv, skb,
 368                                                       BATADV_UNICAST, 0,
 369                                                       mcast_single_orig, vid);
 370                 } else if (forw_mode == BATADV_FORW_SOME) {
 371                         ret = batadv_mcast_forw_send(bat_priv, skb, vid);
 372                 } else {
 373                         if (batadv_dat_snoop_outgoing_arp_request(bat_priv,
 374                                                                   skb))
 375                                 goto dropped;
 376 
 377                         batadv_dat_snoop_outgoing_arp_reply(bat_priv, skb);
 378 
 379                         ret = batadv_send_skb_via_tt(bat_priv, skb, dst_hint,
 380                                                      vid);
 381                 }
 382                 if (ret != NET_XMIT_SUCCESS)
 383                         goto dropped_freed;
 384         }
 385 
 386         batadv_inc_counter(bat_priv, BATADV_CNT_TX);
 387         batadv_add_counter(bat_priv, BATADV_CNT_TX_BYTES, data_len);
 388         goto end;
 389 
 390 dropped:
 391         kfree_skb(skb);
 392 dropped_freed:
 393         batadv_inc_counter(bat_priv, BATADV_CNT_TX_DROPPED);
 394 end:
 395         if (mcast_single_orig)
 396                 batadv_orig_node_put(mcast_single_orig);
 397         if (primary_if)
 398                 batadv_hardif_put(primary_if);
 399         return NETDEV_TX_OK;
 400 }
 401 
 402 /**
 403  * batadv_interface_rx() - receive ethernet frame on local batman-adv interface
 404  * @soft_iface: local interface which will receive the ethernet frame
 405  * @skb: ethernet frame for @soft_iface
 406  * @hdr_size: size of already parsed batman-adv header
 407  * @orig_node: originator from which the batman-adv packet was sent
 408  *
 409  * Sends a ethernet frame to the receive path of the local @soft_iface.
 410  * skb->data has still point to the batman-adv header with the size @hdr_size.
 411  * The caller has to have parsed this header already and made sure that at least
 412  * @hdr_size bytes are still available for pull in @skb.
 413  *
 414  * The packet may still get dropped. This can happen when the encapsulated
 415  * ethernet frame is invalid or contains again an batman-adv packet. Also
 416  * unicast packets will be dropped directly when it was sent between two
 417  * isolated clients.
 418  */
 419 void batadv_interface_rx(struct net_device *soft_iface,
 420                          struct sk_buff *skb, int hdr_size,
 421                          struct batadv_orig_node *orig_node)
 422 {
 423         struct batadv_bcast_packet *batadv_bcast_packet;
 424         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
 425         struct vlan_ethhdr *vhdr;
 426         struct ethhdr *ethhdr;
 427         unsigned short vid;
 428         bool is_bcast;
 429 
 430         batadv_bcast_packet = (struct batadv_bcast_packet *)skb->data;
 431         is_bcast = (batadv_bcast_packet->packet_type == BATADV_BCAST);
 432 
 433         skb_pull_rcsum(skb, hdr_size);
 434         skb_reset_mac_header(skb);
 435 
 436         /* clean the netfilter state now that the batman-adv header has been
 437          * removed
 438          */
 439         nf_reset_ct(skb);
 440 
 441         if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
 442                 goto dropped;
 443 
 444         vid = batadv_get_vid(skb, 0);
 445         ethhdr = eth_hdr(skb);
 446 
 447         switch (ntohs(ethhdr->h_proto)) {
 448         case ETH_P_8021Q:
 449                 if (!pskb_may_pull(skb, VLAN_ETH_HLEN))
 450                         goto dropped;
 451 
 452                 vhdr = (struct vlan_ethhdr *)skb->data;
 453 
 454                 /* drop batman-in-batman packets to prevent loops */
 455                 if (vhdr->h_vlan_encapsulated_proto != htons(ETH_P_BATMAN))
 456                         break;
 457 
 458                 /* fall through */
 459         case ETH_P_BATMAN:
 460                 goto dropped;
 461         }
 462 
 463         /* skb->dev & skb->pkt_type are set here */
 464         skb->protocol = eth_type_trans(skb, soft_iface);
 465         skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
 466 
 467         batadv_inc_counter(bat_priv, BATADV_CNT_RX);
 468         batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES,
 469                            skb->len + ETH_HLEN);
 470 
 471         /* Let the bridge loop avoidance check the packet. If will
 472          * not handle it, we can safely push it up.
 473          */
 474         if (batadv_bla_rx(bat_priv, skb, vid, is_bcast))
 475                 goto out;
 476 
 477         if (orig_node)
 478                 batadv_tt_add_temporary_global_entry(bat_priv, orig_node,
 479                                                      ethhdr->h_source, vid);
 480 
 481         if (is_multicast_ether_addr(ethhdr->h_dest)) {
 482                 /* set the mark on broadcast packets if AP isolation is ON and
 483                  * the packet is coming from an "isolated" client
 484                  */
 485                 if (batadv_vlan_ap_isola_get(bat_priv, vid) &&
 486                     batadv_tt_global_is_isolated(bat_priv, ethhdr->h_source,
 487                                                  vid)) {
 488                         /* save bits in skb->mark not covered by the mask and
 489                          * apply the mark on the rest
 490                          */
 491                         skb->mark &= ~bat_priv->isolation_mark_mask;
 492                         skb->mark |= bat_priv->isolation_mark;
 493                 }
 494         } else if (batadv_is_ap_isolated(bat_priv, ethhdr->h_source,
 495                                          ethhdr->h_dest, vid)) {
 496                 goto dropped;
 497         }
 498 
 499         netif_rx(skb);
 500         goto out;
 501 
 502 dropped:
 503         kfree_skb(skb);
 504 out:
 505         return;
 506 }
 507 
 508 /**
 509  * batadv_softif_vlan_release() - release vlan from lists and queue for free
 510  *  after rcu grace period
 511  * @ref: kref pointer of the vlan object
 512  */
 513 static void batadv_softif_vlan_release(struct kref *ref)
 514 {
 515         struct batadv_softif_vlan *vlan;
 516 
 517         vlan = container_of(ref, struct batadv_softif_vlan, refcount);
 518 
 519         spin_lock_bh(&vlan->bat_priv->softif_vlan_list_lock);
 520         hlist_del_rcu(&vlan->list);
 521         spin_unlock_bh(&vlan->bat_priv->softif_vlan_list_lock);
 522 
 523         kfree_rcu(vlan, rcu);
 524 }
 525 
 526 /**
 527  * batadv_softif_vlan_put() - decrease the vlan object refcounter and
 528  *  possibly release it
 529  * @vlan: the vlan object to release
 530  */
 531 void batadv_softif_vlan_put(struct batadv_softif_vlan *vlan)
 532 {
 533         if (!vlan)
 534                 return;
 535 
 536         kref_put(&vlan->refcount, batadv_softif_vlan_release);
 537 }
 538 
 539 /**
 540  * batadv_softif_vlan_get() - get the vlan object for a specific vid
 541  * @bat_priv: the bat priv with all the soft interface information
 542  * @vid: the identifier of the vlan object to retrieve
 543  *
 544  * Return: the private data of the vlan matching the vid passed as argument or
 545  * NULL otherwise. The refcounter of the returned object is incremented by 1.
 546  */
 547 struct batadv_softif_vlan *batadv_softif_vlan_get(struct batadv_priv *bat_priv,
 548                                                   unsigned short vid)
 549 {
 550         struct batadv_softif_vlan *vlan_tmp, *vlan = NULL;
 551 
 552         rcu_read_lock();
 553         hlist_for_each_entry_rcu(vlan_tmp, &bat_priv->softif_vlan_list, list) {
 554                 if (vlan_tmp->vid != vid)
 555                         continue;
 556 
 557                 if (!kref_get_unless_zero(&vlan_tmp->refcount))
 558                         continue;
 559 
 560                 vlan = vlan_tmp;
 561                 break;
 562         }
 563         rcu_read_unlock();
 564 
 565         return vlan;
 566 }
 567 
 568 /**
 569  * batadv_softif_create_vlan() - allocate the needed resources for a new vlan
 570  * @bat_priv: the bat priv with all the soft interface information
 571  * @vid: the VLAN identifier
 572  *
 573  * Return: 0 on success, a negative error otherwise.
 574  */
 575 int batadv_softif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid)
 576 {
 577         struct batadv_softif_vlan *vlan;
 578         int err;
 579 
 580         spin_lock_bh(&bat_priv->softif_vlan_list_lock);
 581 
 582         vlan = batadv_softif_vlan_get(bat_priv, vid);
 583         if (vlan) {
 584                 batadv_softif_vlan_put(vlan);
 585                 spin_unlock_bh(&bat_priv->softif_vlan_list_lock);
 586                 return -EEXIST;
 587         }
 588 
 589         vlan = kzalloc(sizeof(*vlan), GFP_ATOMIC);
 590         if (!vlan) {
 591                 spin_unlock_bh(&bat_priv->softif_vlan_list_lock);
 592                 return -ENOMEM;
 593         }
 594 
 595         vlan->bat_priv = bat_priv;
 596         vlan->vid = vid;
 597         kref_init(&vlan->refcount);
 598 
 599         atomic_set(&vlan->ap_isolation, 0);
 600 
 601         kref_get(&vlan->refcount);
 602         hlist_add_head_rcu(&vlan->list, &bat_priv->softif_vlan_list);
 603         spin_unlock_bh(&bat_priv->softif_vlan_list_lock);
 604 
 605         /* batadv_sysfs_add_vlan cannot be in the spinlock section due to the
 606          * sleeping behavior of the sysfs functions and the fs_reclaim lock
 607          */
 608         err = batadv_sysfs_add_vlan(bat_priv->soft_iface, vlan);
 609         if (err) {
 610                 /* ref for the function */
 611                 batadv_softif_vlan_put(vlan);
 612 
 613                 /* ref for the list */
 614                 batadv_softif_vlan_put(vlan);
 615                 return err;
 616         }
 617 
 618         /* add a new TT local entry. This one will be marked with the NOPURGE
 619          * flag
 620          */
 621         batadv_tt_local_add(bat_priv->soft_iface,
 622                             bat_priv->soft_iface->dev_addr, vid,
 623                             BATADV_NULL_IFINDEX, BATADV_NO_MARK);
 624 
 625         /* don't return reference to new softif_vlan */
 626         batadv_softif_vlan_put(vlan);
 627 
 628         return 0;
 629 }
 630 
 631 /**
 632  * batadv_softif_destroy_vlan() - remove and destroy a softif_vlan object
 633  * @bat_priv: the bat priv with all the soft interface information
 634  * @vlan: the object to remove
 635  */
 636 static void batadv_softif_destroy_vlan(struct batadv_priv *bat_priv,
 637                                        struct batadv_softif_vlan *vlan)
 638 {
 639         /* explicitly remove the associated TT local entry because it is marked
 640          * with the NOPURGE flag
 641          */
 642         batadv_tt_local_remove(bat_priv, bat_priv->soft_iface->dev_addr,
 643                                vlan->vid, "vlan interface destroyed", false);
 644 
 645         batadv_sysfs_del_vlan(bat_priv, vlan);
 646         batadv_softif_vlan_put(vlan);
 647 }
 648 
 649 /**
 650  * batadv_interface_add_vid() - ndo_add_vid API implementation
 651  * @dev: the netdev of the mesh interface
 652  * @proto: protocol of the the vlan id
 653  * @vid: identifier of the new vlan
 654  *
 655  * Set up all the internal structures for handling the new vlan on top of the
 656  * mesh interface
 657  *
 658  * Return: 0 on success or a negative error code in case of failure.
 659  */
 660 static int batadv_interface_add_vid(struct net_device *dev, __be16 proto,
 661                                     unsigned short vid)
 662 {
 663         struct batadv_priv *bat_priv = netdev_priv(dev);
 664         struct batadv_softif_vlan *vlan;
 665         int ret;
 666 
 667         /* only 802.1Q vlans are supported.
 668          * batman-adv does not know how to handle other types
 669          */
 670         if (proto != htons(ETH_P_8021Q))
 671                 return -EINVAL;
 672 
 673         vid |= BATADV_VLAN_HAS_TAG;
 674 
 675         /* if a new vlan is getting created and it already exists, it means that
 676          * it was not deleted yet. batadv_softif_vlan_get() increases the
 677          * refcount in order to revive the object.
 678          *
 679          * if it does not exist then create it.
 680          */
 681         vlan = batadv_softif_vlan_get(bat_priv, vid);
 682         if (!vlan)
 683                 return batadv_softif_create_vlan(bat_priv, vid);
 684 
 685         /* recreate the sysfs object if it was already destroyed (and it should
 686          * be since we received a kill_vid() for this vlan
 687          */
 688         if (!vlan->kobj) {
 689                 ret = batadv_sysfs_add_vlan(bat_priv->soft_iface, vlan);
 690                 if (ret) {
 691                         batadv_softif_vlan_put(vlan);
 692                         return ret;
 693                 }
 694         }
 695 
 696         /* add a new TT local entry. This one will be marked with the NOPURGE
 697          * flag. This must be added again, even if the vlan object already
 698          * exists, because the entry was deleted by kill_vid()
 699          */
 700         batadv_tt_local_add(bat_priv->soft_iface,
 701                             bat_priv->soft_iface->dev_addr, vid,
 702                             BATADV_NULL_IFINDEX, BATADV_NO_MARK);
 703 
 704         return 0;
 705 }
 706 
 707 /**
 708  * batadv_interface_kill_vid() - ndo_kill_vid API implementation
 709  * @dev: the netdev of the mesh interface
 710  * @proto: protocol of the the vlan id
 711  * @vid: identifier of the deleted vlan
 712  *
 713  * Destroy all the internal structures used to handle the vlan identified by vid
 714  * on top of the mesh interface
 715  *
 716  * Return: 0 on success, -EINVAL if the specified prototype is not ETH_P_8021Q
 717  * or -ENOENT if the specified vlan id wasn't registered.
 718  */
 719 static int batadv_interface_kill_vid(struct net_device *dev, __be16 proto,
 720                                      unsigned short vid)
 721 {
 722         struct batadv_priv *bat_priv = netdev_priv(dev);
 723         struct batadv_softif_vlan *vlan;
 724 
 725         /* only 802.1Q vlans are supported. batman-adv does not know how to
 726          * handle other types
 727          */
 728         if (proto != htons(ETH_P_8021Q))
 729                 return -EINVAL;
 730 
 731         vlan = batadv_softif_vlan_get(bat_priv, vid | BATADV_VLAN_HAS_TAG);
 732         if (!vlan)
 733                 return -ENOENT;
 734 
 735         batadv_softif_destroy_vlan(bat_priv, vlan);
 736 
 737         /* finally free the vlan object */
 738         batadv_softif_vlan_put(vlan);
 739 
 740         return 0;
 741 }
 742 
 743 /**
 744  * batadv_softif_init_late() - late stage initialization of soft interface
 745  * @dev: registered network device to modify
 746  *
 747  * Return: error code on failures
 748  */
 749 static int batadv_softif_init_late(struct net_device *dev)
 750 {
 751         struct batadv_priv *bat_priv;
 752         u32 random_seqno;
 753         int ret;
 754         size_t cnt_len = sizeof(u64) * BATADV_CNT_NUM;
 755 
 756         bat_priv = netdev_priv(dev);
 757         bat_priv->soft_iface = dev;
 758 
 759         /* batadv_interface_stats() needs to be available as soon as
 760          * register_netdevice() has been called
 761          */
 762         bat_priv->bat_counters = __alloc_percpu(cnt_len, __alignof__(u64));
 763         if (!bat_priv->bat_counters)
 764                 return -ENOMEM;
 765 
 766         atomic_set(&bat_priv->aggregated_ogms, 1);
 767         atomic_set(&bat_priv->bonding, 0);
 768 #ifdef CONFIG_BATMAN_ADV_BLA
 769         atomic_set(&bat_priv->bridge_loop_avoidance, 1);
 770 #endif
 771 #ifdef CONFIG_BATMAN_ADV_DAT
 772         atomic_set(&bat_priv->distributed_arp_table, 1);
 773 #endif
 774 #ifdef CONFIG_BATMAN_ADV_MCAST
 775         atomic_set(&bat_priv->multicast_mode, 1);
 776         atomic_set(&bat_priv->multicast_fanout, 16);
 777         atomic_set(&bat_priv->mcast.num_want_all_unsnoopables, 0);
 778         atomic_set(&bat_priv->mcast.num_want_all_ipv4, 0);
 779         atomic_set(&bat_priv->mcast.num_want_all_ipv6, 0);
 780 #endif
 781         atomic_set(&bat_priv->gw.mode, BATADV_GW_MODE_OFF);
 782         atomic_set(&bat_priv->gw.bandwidth_down, 100);
 783         atomic_set(&bat_priv->gw.bandwidth_up, 20);
 784         atomic_set(&bat_priv->orig_interval, 1000);
 785         atomic_set(&bat_priv->hop_penalty, 30);
 786 #ifdef CONFIG_BATMAN_ADV_DEBUG
 787         atomic_set(&bat_priv->log_level, 0);
 788 #endif
 789         atomic_set(&bat_priv->fragmentation, 1);
 790         atomic_set(&bat_priv->packet_size_max, ETH_DATA_LEN);
 791         atomic_set(&bat_priv->bcast_queue_left, BATADV_BCAST_QUEUE_LEN);
 792         atomic_set(&bat_priv->batman_queue_left, BATADV_BATMAN_QUEUE_LEN);
 793 
 794         atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE);
 795         atomic_set(&bat_priv->bcast_seqno, 1);
 796         atomic_set(&bat_priv->tt.vn, 0);
 797         atomic_set(&bat_priv->tt.local_changes, 0);
 798         atomic_set(&bat_priv->tt.ogm_append_cnt, 0);
 799 #ifdef CONFIG_BATMAN_ADV_BLA
 800         atomic_set(&bat_priv->bla.num_requests, 0);
 801 #endif
 802         atomic_set(&bat_priv->tp_num, 0);
 803 
 804         bat_priv->tt.last_changeset = NULL;
 805         bat_priv->tt.last_changeset_len = 0;
 806         bat_priv->isolation_mark = 0;
 807         bat_priv->isolation_mark_mask = 0;
 808 
 809         /* randomize initial seqno to avoid collision */
 810         get_random_bytes(&random_seqno, sizeof(random_seqno));
 811         atomic_set(&bat_priv->frag_seqno, random_seqno);
 812 
 813         bat_priv->primary_if = NULL;
 814 
 815         batadv_nc_init_bat_priv(bat_priv);
 816 
 817         ret = batadv_algo_select(bat_priv, batadv_routing_algo);
 818         if (ret < 0)
 819                 goto free_bat_counters;
 820 
 821         ret = batadv_debugfs_add_meshif(dev);
 822         if (ret < 0)
 823                 goto free_bat_counters;
 824 
 825         ret = batadv_mesh_init(dev);
 826         if (ret < 0)
 827                 goto unreg_debugfs;
 828 
 829         return 0;
 830 
 831 unreg_debugfs:
 832         batadv_debugfs_del_meshif(dev);
 833 free_bat_counters:
 834         free_percpu(bat_priv->bat_counters);
 835         bat_priv->bat_counters = NULL;
 836 
 837         return ret;
 838 }
 839 
 840 /**
 841  * batadv_softif_slave_add() - Add a slave interface to a batadv_soft_interface
 842  * @dev: batadv_soft_interface used as master interface
 843  * @slave_dev: net_device which should become the slave interface
 844  * @extack: extended ACK report struct
 845  *
 846  * Return: 0 if successful or error otherwise.
 847  */
 848 static int batadv_softif_slave_add(struct net_device *dev,
 849                                    struct net_device *slave_dev,
 850                                    struct netlink_ext_ack *extack)
 851 {
 852         struct batadv_hard_iface *hard_iface;
 853         struct net *net = dev_net(dev);
 854         int ret = -EINVAL;
 855 
 856         hard_iface = batadv_hardif_get_by_netdev(slave_dev);
 857         if (!hard_iface || hard_iface->soft_iface)
 858                 goto out;
 859 
 860         ret = batadv_hardif_enable_interface(hard_iface, net, dev->name);
 861 
 862 out:
 863         if (hard_iface)
 864                 batadv_hardif_put(hard_iface);
 865         return ret;
 866 }
 867 
 868 /**
 869  * batadv_softif_slave_del() - Delete a slave iface from a batadv_soft_interface
 870  * @dev: batadv_soft_interface used as master interface
 871  * @slave_dev: net_device which should be removed from the master interface
 872  *
 873  * Return: 0 if successful or error otherwise.
 874  */
 875 static int batadv_softif_slave_del(struct net_device *dev,
 876                                    struct net_device *slave_dev)
 877 {
 878         struct batadv_hard_iface *hard_iface;
 879         int ret = -EINVAL;
 880 
 881         hard_iface = batadv_hardif_get_by_netdev(slave_dev);
 882 
 883         if (!hard_iface || hard_iface->soft_iface != dev)
 884                 goto out;
 885 
 886         batadv_hardif_disable_interface(hard_iface, BATADV_IF_CLEANUP_KEEP);
 887         ret = 0;
 888 
 889 out:
 890         if (hard_iface)
 891                 batadv_hardif_put(hard_iface);
 892         return ret;
 893 }
 894 
 895 static const struct net_device_ops batadv_netdev_ops = {
 896         .ndo_init = batadv_softif_init_late,
 897         .ndo_open = batadv_interface_open,
 898         .ndo_stop = batadv_interface_release,
 899         .ndo_get_stats = batadv_interface_stats,
 900         .ndo_vlan_rx_add_vid = batadv_interface_add_vid,
 901         .ndo_vlan_rx_kill_vid = batadv_interface_kill_vid,
 902         .ndo_set_mac_address = batadv_interface_set_mac_addr,
 903         .ndo_change_mtu = batadv_interface_change_mtu,
 904         .ndo_set_rx_mode = batadv_interface_set_rx_mode,
 905         .ndo_start_xmit = batadv_interface_tx,
 906         .ndo_validate_addr = eth_validate_addr,
 907         .ndo_add_slave = batadv_softif_slave_add,
 908         .ndo_del_slave = batadv_softif_slave_del,
 909 };
 910 
 911 static void batadv_get_drvinfo(struct net_device *dev,
 912                                struct ethtool_drvinfo *info)
 913 {
 914         strscpy(info->driver, "B.A.T.M.A.N. advanced", sizeof(info->driver));
 915         strscpy(info->version, BATADV_SOURCE_VERSION, sizeof(info->version));
 916         strscpy(info->fw_version, "N/A", sizeof(info->fw_version));
 917         strscpy(info->bus_info, "batman", sizeof(info->bus_info));
 918 }
 919 
 920 /* Inspired by drivers/net/ethernet/dlink/sundance.c:1702
 921  * Declare each description string in struct.name[] to get fixed sized buffer
 922  * and compile time checking for strings longer than ETH_GSTRING_LEN.
 923  */
 924 static const struct {
 925         const char name[ETH_GSTRING_LEN];
 926 } batadv_counters_strings[] = {
 927         { "tx" },
 928         { "tx_bytes" },
 929         { "tx_dropped" },
 930         { "rx" },
 931         { "rx_bytes" },
 932         { "forward" },
 933         { "forward_bytes" },
 934         { "mgmt_tx" },
 935         { "mgmt_tx_bytes" },
 936         { "mgmt_rx" },
 937         { "mgmt_rx_bytes" },
 938         { "frag_tx" },
 939         { "frag_tx_bytes" },
 940         { "frag_rx" },
 941         { "frag_rx_bytes" },
 942         { "frag_fwd" },
 943         { "frag_fwd_bytes" },
 944         { "tt_request_tx" },
 945         { "tt_request_rx" },
 946         { "tt_response_tx" },
 947         { "tt_response_rx" },
 948         { "tt_roam_adv_tx" },
 949         { "tt_roam_adv_rx" },
 950 #ifdef CONFIG_BATMAN_ADV_DAT
 951         { "dat_get_tx" },
 952         { "dat_get_rx" },
 953         { "dat_put_tx" },
 954         { "dat_put_rx" },
 955         { "dat_cached_reply_tx" },
 956 #endif
 957 #ifdef CONFIG_BATMAN_ADV_NC
 958         { "nc_code" },
 959         { "nc_code_bytes" },
 960         { "nc_recode" },
 961         { "nc_recode_bytes" },
 962         { "nc_buffer" },
 963         { "nc_decode" },
 964         { "nc_decode_bytes" },
 965         { "nc_decode_failed" },
 966         { "nc_sniffed" },
 967 #endif
 968 };
 969 
 970 static void batadv_get_strings(struct net_device *dev, u32 stringset, u8 *data)
 971 {
 972         if (stringset == ETH_SS_STATS)
 973                 memcpy(data, batadv_counters_strings,
 974                        sizeof(batadv_counters_strings));
 975 }
 976 
 977 static void batadv_get_ethtool_stats(struct net_device *dev,
 978                                      struct ethtool_stats *stats, u64 *data)
 979 {
 980         struct batadv_priv *bat_priv = netdev_priv(dev);
 981         int i;
 982 
 983         for (i = 0; i < BATADV_CNT_NUM; i++)
 984                 data[i] = batadv_sum_counter(bat_priv, i);
 985 }
 986 
 987 static int batadv_get_sset_count(struct net_device *dev, int stringset)
 988 {
 989         if (stringset == ETH_SS_STATS)
 990                 return BATADV_CNT_NUM;
 991 
 992         return -EOPNOTSUPP;
 993 }
 994 
 995 static const struct ethtool_ops batadv_ethtool_ops = {
 996         .get_drvinfo = batadv_get_drvinfo,
 997         .get_link = ethtool_op_get_link,
 998         .get_strings = batadv_get_strings,
 999         .get_ethtool_stats = batadv_get_ethtool_stats,
1000         .get_sset_count = batadv_get_sset_count,
1001 };
1002 
1003 /**
1004  * batadv_softif_free() - Deconstructor of batadv_soft_interface
1005  * @dev: Device to cleanup and remove
1006  */
1007 static void batadv_softif_free(struct net_device *dev)
1008 {
1009         batadv_debugfs_del_meshif(dev);
1010         batadv_mesh_free(dev);
1011 
1012         /* some scheduled RCU callbacks need the bat_priv struct to accomplish
1013          * their tasks. Wait for them all to be finished before freeing the
1014          * netdev and its private data (bat_priv)
1015          */
1016         rcu_barrier();
1017 }
1018 
1019 /**
1020  * batadv_softif_init_early() - early stage initialization of soft interface
1021  * @dev: registered network device to modify
1022  */
1023 static void batadv_softif_init_early(struct net_device *dev)
1024 {
1025         ether_setup(dev);
1026 
1027         dev->netdev_ops = &batadv_netdev_ops;
1028         dev->needs_free_netdev = true;
1029         dev->priv_destructor = batadv_softif_free;
1030         dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_NETNS_LOCAL;
1031         dev->features |= NETIF_F_LLTX;
1032         dev->priv_flags |= IFF_NO_QUEUE;
1033 
1034         /* can't call min_mtu, because the needed variables
1035          * have not been initialized yet
1036          */
1037         dev->mtu = ETH_DATA_LEN;
1038 
1039         /* generate random address */
1040         eth_hw_addr_random(dev);
1041 
1042         dev->ethtool_ops = &batadv_ethtool_ops;
1043 }
1044 
1045 /**
1046  * batadv_softif_create() - Create and register soft interface
1047  * @net: the applicable net namespace
1048  * @name: name of the new soft interface
1049  *
1050  * Return: newly allocated soft_interface, NULL on errors
1051  */
1052 struct net_device *batadv_softif_create(struct net *net, const char *name)
1053 {
1054         struct net_device *soft_iface;
1055         int ret;
1056 
1057         soft_iface = alloc_netdev(sizeof(struct batadv_priv), name,
1058                                   NET_NAME_UNKNOWN, batadv_softif_init_early);
1059         if (!soft_iface)
1060                 return NULL;
1061 
1062         dev_net_set(soft_iface, net);
1063 
1064         soft_iface->rtnl_link_ops = &batadv_link_ops;
1065 
1066         ret = register_netdevice(soft_iface);
1067         if (ret < 0) {
1068                 pr_err("Unable to register the batman interface '%s': %i\n",
1069                        name, ret);
1070                 free_netdev(soft_iface);
1071                 return NULL;
1072         }
1073 
1074         return soft_iface;
1075 }
1076 
1077 /**
1078  * batadv_softif_destroy_sysfs() - deletion of batadv_soft_interface via sysfs
1079  * @soft_iface: the to-be-removed batman-adv interface
1080  */
1081 void batadv_softif_destroy_sysfs(struct net_device *soft_iface)
1082 {
1083         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
1084         struct batadv_softif_vlan *vlan;
1085 
1086         ASSERT_RTNL();
1087 
1088         /* destroy the "untagged" VLAN */
1089         vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS);
1090         if (vlan) {
1091                 batadv_softif_destroy_vlan(bat_priv, vlan);
1092                 batadv_softif_vlan_put(vlan);
1093         }
1094 
1095         batadv_sysfs_del_meshif(soft_iface);
1096         unregister_netdevice(soft_iface);
1097 }
1098 
1099 /**
1100  * batadv_softif_destroy_netlink() - deletion of batadv_soft_interface via
1101  *  netlink
1102  * @soft_iface: the to-be-removed batman-adv interface
1103  * @head: list pointer
1104  */
1105 static void batadv_softif_destroy_netlink(struct net_device *soft_iface,
1106                                           struct list_head *head)
1107 {
1108         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
1109         struct batadv_hard_iface *hard_iface;
1110         struct batadv_softif_vlan *vlan;
1111 
1112         list_for_each_entry(hard_iface, &batadv_hardif_list, list) {
1113                 if (hard_iface->soft_iface == soft_iface)
1114                         batadv_hardif_disable_interface(hard_iface,
1115                                                         BATADV_IF_CLEANUP_KEEP);
1116         }
1117 
1118         /* destroy the "untagged" VLAN */
1119         vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS);
1120         if (vlan) {
1121                 batadv_softif_destroy_vlan(bat_priv, vlan);
1122                 batadv_softif_vlan_put(vlan);
1123         }
1124 
1125         batadv_sysfs_del_meshif(soft_iface);
1126         unregister_netdevice_queue(soft_iface, head);
1127 }
1128 
1129 /**
1130  * batadv_softif_is_valid() - Check whether device is a batadv soft interface
1131  * @net_dev: device which should be checked
1132  *
1133  * Return: true when net_dev is a batman-adv interface, false otherwise
1134  */
1135 bool batadv_softif_is_valid(const struct net_device *net_dev)
1136 {
1137         if (net_dev->netdev_ops->ndo_start_xmit == batadv_interface_tx)
1138                 return true;
1139 
1140         return false;
1141 }
1142 
1143 struct rtnl_link_ops batadv_link_ops __read_mostly = {
1144         .kind           = "batadv",
1145         .priv_size      = sizeof(struct batadv_priv),
1146         .setup          = batadv_softif_init_early,
1147         .dellink        = batadv_softif_destroy_netlink,
1148 };
/* [<][>][^][v][top][bottom][index][help] */
root/net/batman-adv/soft-interface.c

DEFINITIONS
