mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
993 lines
27 KiB
993 lines
27 KiB
// SPDX-License-Identifier: GPL-2.0 |
|
/* Copyright (C) B.A.T.M.A.N. contributors: |
|
* |
|
* Marek Lindner, Simon Wunderlich |
|
*/ |
|
|
|
#include "hard-interface.h" |
|
#include "main.h" |
|
|
|
#include <linux/atomic.h> |
|
#include <linux/byteorder/generic.h> |
|
#include <linux/gfp.h> |
|
#include <linux/if.h> |
|
#include <linux/if_arp.h> |
|
#include <linux/if_ether.h> |
|
#include <linux/kernel.h> |
|
#include <linux/kref.h> |
|
#include <linux/limits.h> |
|
#include <linux/list.h> |
|
#include <linux/minmax.h> |
|
#include <linux/mutex.h> |
|
#include <linux/netdevice.h> |
|
#include <linux/printk.h> |
|
#include <linux/rculist.h> |
|
#include <linux/rtnetlink.h> |
|
#include <linux/slab.h> |
|
#include <linux/spinlock.h> |
|
#include <net/net_namespace.h> |
|
#include <net/rtnetlink.h> |
|
#include <uapi/linux/batadv_packet.h> |
|
|
|
#include "bat_v.h" |
|
#include "bridge_loop_avoidance.h" |
|
#include "distributed-arp-table.h" |
|
#include "gateway_client.h" |
|
#include "log.h" |
|
#include "originator.h" |
|
#include "send.h" |
|
#include "soft-interface.h" |
|
#include "translation-table.h" |
|
|
|
/** |
|
* batadv_hardif_release() - release hard interface from lists and queue for |
|
* free after rcu grace period |
|
* @ref: kref pointer of the hard interface |
|
*/ |
|
void batadv_hardif_release(struct kref *ref) |
|
{ |
|
struct batadv_hard_iface *hard_iface; |
|
|
|
hard_iface = container_of(ref, struct batadv_hard_iface, refcount); |
|
dev_put(hard_iface->net_dev); |
|
|
|
kfree_rcu(hard_iface, rcu); |
|
} |
|
|
|
/** |
|
* batadv_hardif_get_by_netdev() - Get hard interface object of a net_device |
|
* @net_dev: net_device to search for |
|
* |
|
* Return: batadv_hard_iface of net_dev (with increased refcnt), NULL on errors |
|
*/ |
|
struct batadv_hard_iface * |
|
batadv_hardif_get_by_netdev(const struct net_device *net_dev) |
|
{ |
|
struct batadv_hard_iface *hard_iface; |
|
|
|
rcu_read_lock(); |
|
list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
|
if (hard_iface->net_dev == net_dev && |
|
kref_get_unless_zero(&hard_iface->refcount)) |
|
goto out; |
|
} |
|
|
|
hard_iface = NULL; |
|
|
|
out: |
|
rcu_read_unlock(); |
|
return hard_iface; |
|
} |
|
|
|
/** |
|
* batadv_getlink_net() - return link net namespace (of use fallback) |
|
* @netdev: net_device to check |
|
* @fallback_net: return in case get_link_net is not available for @netdev |
|
* |
|
* Return: result of rtnl_link_ops->get_link_net or @fallback_net |
|
*/ |
|
static struct net *batadv_getlink_net(const struct net_device *netdev, |
|
struct net *fallback_net) |
|
{ |
|
if (!netdev->rtnl_link_ops) |
|
return fallback_net; |
|
|
|
if (!netdev->rtnl_link_ops->get_link_net) |
|
return fallback_net; |
|
|
|
return netdev->rtnl_link_ops->get_link_net(netdev); |
|
} |
|
|
|
/** |
|
* batadv_mutual_parents() - check if two devices are each others parent |
|
* @dev1: 1st net dev |
|
* @net1: 1st devices netns |
|
* @dev2: 2nd net dev |
|
* @net2: 2nd devices netns |
|
* |
|
* veth devices come in pairs and each is the parent of the other! |
|
* |
|
* Return: true if the devices are each others parent, otherwise false |
|
*/ |
|
static bool batadv_mutual_parents(const struct net_device *dev1, |
|
struct net *net1, |
|
const struct net_device *dev2, |
|
struct net *net2) |
|
{ |
|
int dev1_parent_iflink = dev_get_iflink(dev1); |
|
int dev2_parent_iflink = dev_get_iflink(dev2); |
|
const struct net *dev1_parent_net; |
|
const struct net *dev2_parent_net; |
|
|
|
dev1_parent_net = batadv_getlink_net(dev1, net1); |
|
dev2_parent_net = batadv_getlink_net(dev2, net2); |
|
|
|
if (!dev1_parent_iflink || !dev2_parent_iflink) |
|
return false; |
|
|
|
return (dev1_parent_iflink == dev2->ifindex) && |
|
(dev2_parent_iflink == dev1->ifindex) && |
|
net_eq(dev1_parent_net, net2) && |
|
net_eq(dev2_parent_net, net1); |
|
} |
|
|
|
/** |
|
* batadv_is_on_batman_iface() - check if a device is a batman iface descendant |
|
* @net_dev: the device to check |
|
* |
|
* If the user creates any virtual device on top of a batman-adv interface, it |
|
* is important to prevent this new interface from being used to create a new |
|
* mesh network (this behaviour would lead to a batman-over-batman |
|
* configuration). This function recursively checks all the fathers of the |
|
* device passed as argument looking for a batman-adv soft interface. |
|
* |
|
* Return: true if the device is descendant of a batman-adv mesh interface (or |
|
* if it is a batman-adv interface itself), false otherwise |
|
*/ |
|
static bool batadv_is_on_batman_iface(const struct net_device *net_dev) |
|
{ |
|
struct net *net = dev_net(net_dev); |
|
struct net_device *parent_dev; |
|
struct net *parent_net; |
|
bool ret; |
|
|
|
/* check if this is a batman-adv mesh interface */ |
|
if (batadv_softif_is_valid(net_dev)) |
|
return true; |
|
|
|
/* no more parents..stop recursion */ |
|
if (dev_get_iflink(net_dev) == 0 || |
|
dev_get_iflink(net_dev) == net_dev->ifindex) |
|
return false; |
|
|
|
parent_net = batadv_getlink_net(net_dev, net); |
|
|
|
/* recurse over the parent device */ |
|
parent_dev = __dev_get_by_index((struct net *)parent_net, |
|
dev_get_iflink(net_dev)); |
|
/* if we got a NULL parent_dev there is something broken.. */ |
|
if (!parent_dev) { |
|
pr_err("Cannot find parent device\n"); |
|
return false; |
|
} |
|
|
|
if (batadv_mutual_parents(net_dev, net, parent_dev, parent_net)) |
|
return false; |
|
|
|
ret = batadv_is_on_batman_iface(parent_dev); |
|
|
|
return ret; |
|
} |
|
|
|
static bool batadv_is_valid_iface(const struct net_device *net_dev) |
|
{ |
|
if (net_dev->flags & IFF_LOOPBACK) |
|
return false; |
|
|
|
if (net_dev->type != ARPHRD_ETHER) |
|
return false; |
|
|
|
if (net_dev->addr_len != ETH_ALEN) |
|
return false; |
|
|
|
/* no batman over batman */ |
|
if (batadv_is_on_batman_iface(net_dev)) |
|
return false; |
|
|
|
return true; |
|
} |
|
|
|
/** |
|
* batadv_get_real_netdevice() - check if the given netdev struct is a virtual |
|
* interface on top of another 'real' interface |
|
* @netdev: the device to check |
|
* |
|
* Callers must hold the rtnl semaphore. You may want batadv_get_real_netdev() |
|
* instead of this. |
|
* |
|
* Return: the 'real' net device or the original net device and NULL in case |
|
* of an error. |
|
*/ |
|
static struct net_device *batadv_get_real_netdevice(struct net_device *netdev) |
|
{ |
|
struct batadv_hard_iface *hard_iface = NULL; |
|
struct net_device *real_netdev = NULL; |
|
struct net *real_net; |
|
struct net *net; |
|
int ifindex; |
|
|
|
ASSERT_RTNL(); |
|
|
|
if (!netdev) |
|
return NULL; |
|
|
|
if (netdev->ifindex == dev_get_iflink(netdev)) { |
|
dev_hold(netdev); |
|
return netdev; |
|
} |
|
|
|
hard_iface = batadv_hardif_get_by_netdev(netdev); |
|
if (!hard_iface || !hard_iface->soft_iface) |
|
goto out; |
|
|
|
net = dev_net(hard_iface->soft_iface); |
|
ifindex = dev_get_iflink(netdev); |
|
real_net = batadv_getlink_net(netdev, net); |
|
real_netdev = dev_get_by_index(real_net, ifindex); |
|
|
|
out: |
|
batadv_hardif_put(hard_iface); |
|
return real_netdev; |
|
} |
|
|
|
/** |
|
* batadv_get_real_netdev() - check if the given net_device struct is a virtual |
|
* interface on top of another 'real' interface |
|
* @net_device: the device to check |
|
* |
|
* Return: the 'real' net device or the original net device and NULL in case |
|
* of an error. |
|
*/ |
|
struct net_device *batadv_get_real_netdev(struct net_device *net_device) |
|
{ |
|
struct net_device *real_netdev; |
|
|
|
rtnl_lock(); |
|
real_netdev = batadv_get_real_netdevice(net_device); |
|
rtnl_unlock(); |
|
|
|
return real_netdev; |
|
} |
|
|
|
/** |
|
* batadv_is_wext_netdev() - check if the given net_device struct is a |
|
* wext wifi interface |
|
* @net_device: the device to check |
|
* |
|
* Return: true if the net device is a wext wireless device, false |
|
* otherwise. |
|
*/ |
|
static bool batadv_is_wext_netdev(struct net_device *net_device) |
|
{ |
|
if (!net_device) |
|
return false; |
|
|
|
#ifdef CONFIG_WIRELESS_EXT |
|
/* pre-cfg80211 drivers have to implement WEXT, so it is possible to |
|
* check for wireless_handlers != NULL |
|
*/ |
|
if (net_device->wireless_handlers) |
|
return true; |
|
#endif |
|
|
|
return false; |
|
} |
|
|
|
/** |
|
* batadv_is_cfg80211_netdev() - check if the given net_device struct is a |
|
* cfg80211 wifi interface |
|
* @net_device: the device to check |
|
* |
|
* Return: true if the net device is a cfg80211 wireless device, false |
|
* otherwise. |
|
*/ |
|
static bool batadv_is_cfg80211_netdev(struct net_device *net_device) |
|
{ |
|
if (!net_device) |
|
return false; |
|
|
|
/* cfg80211 drivers have to set ieee80211_ptr */ |
|
if (net_device->ieee80211_ptr) |
|
return true; |
|
|
|
return false; |
|
} |
|
|
|
/** |
|
* batadv_wifi_flags_evaluate() - calculate wifi flags for net_device |
|
* @net_device: the device to check |
|
* |
|
* Return: batadv_hard_iface_wifi_flags flags of the device |
|
*/ |
|
static u32 batadv_wifi_flags_evaluate(struct net_device *net_device) |
|
{ |
|
u32 wifi_flags = 0; |
|
struct net_device *real_netdev; |
|
|
|
if (batadv_is_wext_netdev(net_device)) |
|
wifi_flags |= BATADV_HARDIF_WIFI_WEXT_DIRECT; |
|
|
|
if (batadv_is_cfg80211_netdev(net_device)) |
|
wifi_flags |= BATADV_HARDIF_WIFI_CFG80211_DIRECT; |
|
|
|
real_netdev = batadv_get_real_netdevice(net_device); |
|
if (!real_netdev) |
|
return wifi_flags; |
|
|
|
if (real_netdev == net_device) |
|
goto out; |
|
|
|
if (batadv_is_wext_netdev(real_netdev)) |
|
wifi_flags |= BATADV_HARDIF_WIFI_WEXT_INDIRECT; |
|
|
|
if (batadv_is_cfg80211_netdev(real_netdev)) |
|
wifi_flags |= BATADV_HARDIF_WIFI_CFG80211_INDIRECT; |
|
|
|
out: |
|
dev_put(real_netdev); |
|
return wifi_flags; |
|
} |
|
|
|
/** |
|
* batadv_is_cfg80211_hardif() - check if the given hardif is a cfg80211 wifi |
|
* interface |
|
* @hard_iface: the device to check |
|
* |
|
* Return: true if the net device is a cfg80211 wireless device, false |
|
* otherwise. |
|
*/ |
|
bool batadv_is_cfg80211_hardif(struct batadv_hard_iface *hard_iface) |
|
{ |
|
u32 allowed_flags = 0; |
|
|
|
allowed_flags |= BATADV_HARDIF_WIFI_CFG80211_DIRECT; |
|
allowed_flags |= BATADV_HARDIF_WIFI_CFG80211_INDIRECT; |
|
|
|
return !!(hard_iface->wifi_flags & allowed_flags); |
|
} |
|
|
|
/** |
|
* batadv_is_wifi_hardif() - check if the given hardif is a wifi interface |
|
* @hard_iface: the device to check |
|
* |
|
* Return: true if the net device is a 802.11 wireless device, false otherwise. |
|
*/ |
|
bool batadv_is_wifi_hardif(struct batadv_hard_iface *hard_iface) |
|
{ |
|
if (!hard_iface) |
|
return false; |
|
|
|
return hard_iface->wifi_flags != 0; |
|
} |
|
|
|
/** |
|
* batadv_hardif_no_broadcast() - check whether (re)broadcast is necessary |
|
* @if_outgoing: the outgoing interface checked and considered for (re)broadcast |
|
* @orig_addr: the originator of this packet |
|
* @orig_neigh: originator address of the forwarder we just got the packet from |
|
* (NULL if we originated) |
|
* |
|
* Checks whether a packet needs to be (re)broadcasted on the given interface. |
|
* |
|
* Return: |
|
* BATADV_HARDIF_BCAST_NORECIPIENT: No neighbor on interface |
|
* BATADV_HARDIF_BCAST_DUPFWD: Just one neighbor, but it is the forwarder |
|
* BATADV_HARDIF_BCAST_DUPORIG: Just one neighbor, but it is the originator |
|
* BATADV_HARDIF_BCAST_OK: Several neighbors, must broadcast |
|
*/ |
|
int batadv_hardif_no_broadcast(struct batadv_hard_iface *if_outgoing, |
|
u8 *orig_addr, u8 *orig_neigh) |
|
{ |
|
struct batadv_hardif_neigh_node *hardif_neigh; |
|
struct hlist_node *first; |
|
int ret = BATADV_HARDIF_BCAST_OK; |
|
|
|
rcu_read_lock(); |
|
|
|
/* 0 neighbors -> no (re)broadcast */ |
|
first = rcu_dereference(hlist_first_rcu(&if_outgoing->neigh_list)); |
|
if (!first) { |
|
ret = BATADV_HARDIF_BCAST_NORECIPIENT; |
|
goto out; |
|
} |
|
|
|
/* >1 neighbors -> (re)broadcast */ |
|
if (rcu_dereference(hlist_next_rcu(first))) |
|
goto out; |
|
|
|
hardif_neigh = hlist_entry(first, struct batadv_hardif_neigh_node, |
|
list); |
|
|
|
/* 1 neighbor, is the originator -> no rebroadcast */ |
|
if (orig_addr && batadv_compare_eth(hardif_neigh->orig, orig_addr)) { |
|
ret = BATADV_HARDIF_BCAST_DUPORIG; |
|
/* 1 neighbor, is the one we received from -> no rebroadcast */ |
|
} else if (orig_neigh && |
|
batadv_compare_eth(hardif_neigh->orig, orig_neigh)) { |
|
ret = BATADV_HARDIF_BCAST_DUPFWD; |
|
} |
|
|
|
out: |
|
rcu_read_unlock(); |
|
return ret; |
|
} |
|
|
|
static struct batadv_hard_iface * |
|
batadv_hardif_get_active(const struct net_device *soft_iface) |
|
{ |
|
struct batadv_hard_iface *hard_iface; |
|
|
|
rcu_read_lock(); |
|
list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
|
if (hard_iface->soft_iface != soft_iface) |
|
continue; |
|
|
|
if (hard_iface->if_status == BATADV_IF_ACTIVE && |
|
kref_get_unless_zero(&hard_iface->refcount)) |
|
goto out; |
|
} |
|
|
|
hard_iface = NULL; |
|
|
|
out: |
|
rcu_read_unlock(); |
|
return hard_iface; |
|
} |
|
|
|
static void batadv_primary_if_update_addr(struct batadv_priv *bat_priv, |
|
struct batadv_hard_iface *oldif) |
|
{ |
|
struct batadv_hard_iface *primary_if; |
|
|
|
primary_if = batadv_primary_if_get_selected(bat_priv); |
|
if (!primary_if) |
|
goto out; |
|
|
|
batadv_dat_init_own_addr(bat_priv, primary_if); |
|
batadv_bla_update_orig_address(bat_priv, primary_if, oldif); |
|
out: |
|
batadv_hardif_put(primary_if); |
|
} |
|
|
|
static void batadv_primary_if_select(struct batadv_priv *bat_priv, |
|
struct batadv_hard_iface *new_hard_iface) |
|
{ |
|
struct batadv_hard_iface *curr_hard_iface; |
|
|
|
ASSERT_RTNL(); |
|
|
|
if (new_hard_iface) |
|
kref_get(&new_hard_iface->refcount); |
|
|
|
curr_hard_iface = rcu_replace_pointer(bat_priv->primary_if, |
|
new_hard_iface, 1); |
|
|
|
if (!new_hard_iface) |
|
goto out; |
|
|
|
bat_priv->algo_ops->iface.primary_set(new_hard_iface); |
|
batadv_primary_if_update_addr(bat_priv, curr_hard_iface); |
|
|
|
out: |
|
batadv_hardif_put(curr_hard_iface); |
|
} |
|
|
|
static bool |
|
batadv_hardif_is_iface_up(const struct batadv_hard_iface *hard_iface) |
|
{ |
|
if (hard_iface->net_dev->flags & IFF_UP) |
|
return true; |
|
|
|
return false; |
|
} |
|
|
|
static void batadv_check_known_mac_addr(const struct net_device *net_dev) |
|
{ |
|
const struct batadv_hard_iface *hard_iface; |
|
|
|
rcu_read_lock(); |
|
list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
|
if (hard_iface->if_status != BATADV_IF_ACTIVE && |
|
hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED) |
|
continue; |
|
|
|
if (hard_iface->net_dev == net_dev) |
|
continue; |
|
|
|
if (!batadv_compare_eth(hard_iface->net_dev->dev_addr, |
|
net_dev->dev_addr)) |
|
continue; |
|
|
|
pr_warn("The newly added mac address (%pM) already exists on: %s\n", |
|
net_dev->dev_addr, hard_iface->net_dev->name); |
|
pr_warn("It is strongly recommended to keep mac addresses unique to avoid problems!\n"); |
|
} |
|
rcu_read_unlock(); |
|
} |
|
|
|
/** |
|
* batadv_hardif_recalc_extra_skbroom() - Recalculate skbuff extra head/tailroom |
|
* @soft_iface: netdev struct of the mesh interface |
|
*/ |
|
static void batadv_hardif_recalc_extra_skbroom(struct net_device *soft_iface) |
|
{ |
|
const struct batadv_hard_iface *hard_iface; |
|
unsigned short lower_header_len = ETH_HLEN; |
|
unsigned short lower_headroom = 0; |
|
unsigned short lower_tailroom = 0; |
|
unsigned short needed_headroom; |
|
|
|
rcu_read_lock(); |
|
list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
|
if (hard_iface->if_status == BATADV_IF_NOT_IN_USE) |
|
continue; |
|
|
|
if (hard_iface->soft_iface != soft_iface) |
|
continue; |
|
|
|
lower_header_len = max_t(unsigned short, lower_header_len, |
|
hard_iface->net_dev->hard_header_len); |
|
|
|
lower_headroom = max_t(unsigned short, lower_headroom, |
|
hard_iface->net_dev->needed_headroom); |
|
|
|
lower_tailroom = max_t(unsigned short, lower_tailroom, |
|
hard_iface->net_dev->needed_tailroom); |
|
} |
|
rcu_read_unlock(); |
|
|
|
needed_headroom = lower_headroom + (lower_header_len - ETH_HLEN); |
|
needed_headroom += batadv_max_header_len(); |
|
|
|
/* fragmentation headers don't strip the unicast/... header */ |
|
needed_headroom += sizeof(struct batadv_frag_packet); |
|
|
|
soft_iface->needed_headroom = needed_headroom; |
|
soft_iface->needed_tailroom = lower_tailroom; |
|
} |
|
|
|
/** |
|
* batadv_hardif_min_mtu() - Calculate maximum MTU for soft interface |
|
* @soft_iface: netdev struct of the soft interface |
|
* |
|
* Return: MTU for the soft-interface (limited by the minimal MTU of all active |
|
* slave interfaces) |
|
*/ |
|
int batadv_hardif_min_mtu(struct net_device *soft_iface) |
|
{ |
|
struct batadv_priv *bat_priv = netdev_priv(soft_iface); |
|
const struct batadv_hard_iface *hard_iface; |
|
int min_mtu = INT_MAX; |
|
|
|
rcu_read_lock(); |
|
list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
|
if (hard_iface->if_status != BATADV_IF_ACTIVE && |
|
hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED) |
|
continue; |
|
|
|
if (hard_iface->soft_iface != soft_iface) |
|
continue; |
|
|
|
min_mtu = min_t(int, hard_iface->net_dev->mtu, min_mtu); |
|
} |
|
rcu_read_unlock(); |
|
|
|
if (atomic_read(&bat_priv->fragmentation) == 0) |
|
goto out; |
|
|
|
/* with fragmentation enabled the maximum size of internally generated |
|
* packets such as translation table exchanges or tvlv containers, etc |
|
* has to be calculated |
|
*/ |
|
min_mtu = min_t(int, min_mtu, BATADV_FRAG_MAX_FRAG_SIZE); |
|
min_mtu -= sizeof(struct batadv_frag_packet); |
|
min_mtu *= BATADV_FRAG_MAX_FRAGMENTS; |
|
|
|
out: |
|
/* report to the other components the maximum amount of bytes that |
|
* batman-adv can send over the wire (without considering the payload |
|
* overhead). For example, this value is used by TT to compute the |
|
* maximum local table size |
|
*/ |
|
atomic_set(&bat_priv->packet_size_max, min_mtu); |
|
|
|
/* the real soft-interface MTU is computed by removing the payload |
|
* overhead from the maximum amount of bytes that was just computed. |
|
* |
|
* However batman-adv does not support MTUs bigger than ETH_DATA_LEN |
|
*/ |
|
return min_t(int, min_mtu - batadv_max_header_len(), ETH_DATA_LEN); |
|
} |
|
|
|
/** |
|
* batadv_update_min_mtu() - Adjusts the MTU if a new interface with a smaller |
|
* MTU appeared |
|
* @soft_iface: netdev struct of the soft interface |
|
*/ |
|
void batadv_update_min_mtu(struct net_device *soft_iface) |
|
{ |
|
soft_iface->mtu = batadv_hardif_min_mtu(soft_iface); |
|
|
|
/* Check if the local translate table should be cleaned up to match a |
|
* new (and smaller) MTU. |
|
*/ |
|
batadv_tt_local_resize_to_mtu(soft_iface); |
|
} |
|
|
|
static void |
|
batadv_hardif_activate_interface(struct batadv_hard_iface *hard_iface) |
|
{ |
|
struct batadv_priv *bat_priv; |
|
struct batadv_hard_iface *primary_if = NULL; |
|
|
|
if (hard_iface->if_status != BATADV_IF_INACTIVE) |
|
goto out; |
|
|
|
bat_priv = netdev_priv(hard_iface->soft_iface); |
|
|
|
bat_priv->algo_ops->iface.update_mac(hard_iface); |
|
hard_iface->if_status = BATADV_IF_TO_BE_ACTIVATED; |
|
|
|
/* the first active interface becomes our primary interface or |
|
* the next active interface after the old primary interface was removed |
|
*/ |
|
primary_if = batadv_primary_if_get_selected(bat_priv); |
|
if (!primary_if) |
|
batadv_primary_if_select(bat_priv, hard_iface); |
|
|
|
batadv_info(hard_iface->soft_iface, "Interface activated: %s\n", |
|
hard_iface->net_dev->name); |
|
|
|
batadv_update_min_mtu(hard_iface->soft_iface); |
|
|
|
if (bat_priv->algo_ops->iface.activate) |
|
bat_priv->algo_ops->iface.activate(hard_iface); |
|
|
|
out: |
|
batadv_hardif_put(primary_if); |
|
} |
|
|
|
static void |
|
batadv_hardif_deactivate_interface(struct batadv_hard_iface *hard_iface) |
|
{ |
|
if (hard_iface->if_status != BATADV_IF_ACTIVE && |
|
hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED) |
|
return; |
|
|
|
hard_iface->if_status = BATADV_IF_INACTIVE; |
|
|
|
batadv_info(hard_iface->soft_iface, "Interface deactivated: %s\n", |
|
hard_iface->net_dev->name); |
|
|
|
batadv_update_min_mtu(hard_iface->soft_iface); |
|
} |
|
|
|
/** |
|
* batadv_hardif_enable_interface() - Enslave hard interface to soft interface |
|
* @hard_iface: hard interface to add to soft interface |
|
* @soft_iface: netdev struct of the mesh interface |
|
* |
|
* Return: 0 on success or negative error number in case of failure |
|
*/ |
|
int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface, |
|
struct net_device *soft_iface) |
|
{ |
|
struct batadv_priv *bat_priv; |
|
__be16 ethertype = htons(ETH_P_BATMAN); |
|
int max_header_len = batadv_max_header_len(); |
|
int ret; |
|
|
|
if (hard_iface->if_status != BATADV_IF_NOT_IN_USE) |
|
goto out; |
|
|
|
kref_get(&hard_iface->refcount); |
|
|
|
dev_hold(soft_iface); |
|
hard_iface->soft_iface = soft_iface; |
|
bat_priv = netdev_priv(hard_iface->soft_iface); |
|
|
|
ret = netdev_master_upper_dev_link(hard_iface->net_dev, |
|
soft_iface, NULL, NULL, NULL); |
|
if (ret) |
|
goto err_dev; |
|
|
|
ret = bat_priv->algo_ops->iface.enable(hard_iface); |
|
if (ret < 0) |
|
goto err_upper; |
|
|
|
hard_iface->if_status = BATADV_IF_INACTIVE; |
|
|
|
kref_get(&hard_iface->refcount); |
|
hard_iface->batman_adv_ptype.type = ethertype; |
|
hard_iface->batman_adv_ptype.func = batadv_batman_skb_recv; |
|
hard_iface->batman_adv_ptype.dev = hard_iface->net_dev; |
|
dev_add_pack(&hard_iface->batman_adv_ptype); |
|
|
|
batadv_info(hard_iface->soft_iface, "Adding interface: %s\n", |
|
hard_iface->net_dev->name); |
|
|
|
if (atomic_read(&bat_priv->fragmentation) && |
|
hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len) |
|
batadv_info(hard_iface->soft_iface, |
|
"The MTU of interface %s is too small (%i) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to %i would solve the problem.\n", |
|
hard_iface->net_dev->name, hard_iface->net_dev->mtu, |
|
ETH_DATA_LEN + max_header_len); |
|
|
|
if (!atomic_read(&bat_priv->fragmentation) && |
|
hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len) |
|
batadv_info(hard_iface->soft_iface, |
|
"The MTU of interface %s is too small (%i) to handle the transport of batman-adv packets. If you experience problems getting traffic through try increasing the MTU to %i.\n", |
|
hard_iface->net_dev->name, hard_iface->net_dev->mtu, |
|
ETH_DATA_LEN + max_header_len); |
|
|
|
if (batadv_hardif_is_iface_up(hard_iface)) |
|
batadv_hardif_activate_interface(hard_iface); |
|
else |
|
batadv_err(hard_iface->soft_iface, |
|
"Not using interface %s (retrying later): interface not active\n", |
|
hard_iface->net_dev->name); |
|
|
|
batadv_hardif_recalc_extra_skbroom(soft_iface); |
|
|
|
if (bat_priv->algo_ops->iface.enabled) |
|
bat_priv->algo_ops->iface.enabled(hard_iface); |
|
|
|
out: |
|
return 0; |
|
|
|
err_upper: |
|
netdev_upper_dev_unlink(hard_iface->net_dev, soft_iface); |
|
err_dev: |
|
hard_iface->soft_iface = NULL; |
|
dev_put(soft_iface); |
|
batadv_hardif_put(hard_iface); |
|
return ret; |
|
} |
|
|
|
/** |
|
* batadv_hardif_cnt() - get number of interfaces enslaved to soft interface |
|
* @soft_iface: soft interface to check |
|
* |
|
* This function is only using RCU for locking - the result can therefore be |
|
* off when another function is modifying the list at the same time. The |
|
* caller can use the rtnl_lock to make sure that the count is accurate. |
|
* |
|
* Return: number of connected/enslaved hard interfaces |
|
*/ |
|
static size_t batadv_hardif_cnt(const struct net_device *soft_iface) |
|
{ |
|
struct batadv_hard_iface *hard_iface; |
|
size_t count = 0; |
|
|
|
rcu_read_lock(); |
|
list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
|
if (hard_iface->soft_iface != soft_iface) |
|
continue; |
|
|
|
count++; |
|
} |
|
rcu_read_unlock(); |
|
|
|
return count; |
|
} |
|
|
|
/** |
|
* batadv_hardif_disable_interface() - Remove hard interface from soft interface |
|
* @hard_iface: hard interface to be removed |
|
*/ |
|
void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface) |
|
{ |
|
struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
|
struct batadv_hard_iface *primary_if = NULL; |
|
|
|
batadv_hardif_deactivate_interface(hard_iface); |
|
|
|
if (hard_iface->if_status != BATADV_IF_INACTIVE) |
|
goto out; |
|
|
|
batadv_info(hard_iface->soft_iface, "Removing interface: %s\n", |
|
hard_iface->net_dev->name); |
|
dev_remove_pack(&hard_iface->batman_adv_ptype); |
|
batadv_hardif_put(hard_iface); |
|
|
|
primary_if = batadv_primary_if_get_selected(bat_priv); |
|
if (hard_iface == primary_if) { |
|
struct batadv_hard_iface *new_if; |
|
|
|
new_if = batadv_hardif_get_active(hard_iface->soft_iface); |
|
batadv_primary_if_select(bat_priv, new_if); |
|
|
|
batadv_hardif_put(new_if); |
|
} |
|
|
|
bat_priv->algo_ops->iface.disable(hard_iface); |
|
hard_iface->if_status = BATADV_IF_NOT_IN_USE; |
|
|
|
/* delete all references to this hard_iface */ |
|
batadv_purge_orig_ref(bat_priv); |
|
batadv_purge_outstanding_packets(bat_priv, hard_iface); |
|
dev_put(hard_iface->soft_iface); |
|
|
|
netdev_upper_dev_unlink(hard_iface->net_dev, hard_iface->soft_iface); |
|
batadv_hardif_recalc_extra_skbroom(hard_iface->soft_iface); |
|
|
|
/* nobody uses this interface anymore */ |
|
if (batadv_hardif_cnt(hard_iface->soft_iface) <= 1) |
|
batadv_gw_check_client_stop(bat_priv); |
|
|
|
hard_iface->soft_iface = NULL; |
|
batadv_hardif_put(hard_iface); |
|
|
|
out: |
|
batadv_hardif_put(primary_if); |
|
} |
|
|
|
static struct batadv_hard_iface * |
|
batadv_hardif_add_interface(struct net_device *net_dev) |
|
{ |
|
struct batadv_hard_iface *hard_iface; |
|
|
|
ASSERT_RTNL(); |
|
|
|
if (!batadv_is_valid_iface(net_dev)) |
|
goto out; |
|
|
|
dev_hold(net_dev); |
|
|
|
hard_iface = kzalloc(sizeof(*hard_iface), GFP_ATOMIC); |
|
if (!hard_iface) |
|
goto release_dev; |
|
|
|
hard_iface->net_dev = net_dev; |
|
hard_iface->soft_iface = NULL; |
|
hard_iface->if_status = BATADV_IF_NOT_IN_USE; |
|
|
|
INIT_LIST_HEAD(&hard_iface->list); |
|
INIT_HLIST_HEAD(&hard_iface->neigh_list); |
|
|
|
mutex_init(&hard_iface->bat_iv.ogm_buff_mutex); |
|
spin_lock_init(&hard_iface->neigh_list_lock); |
|
kref_init(&hard_iface->refcount); |
|
|
|
hard_iface->num_bcasts = BATADV_NUM_BCASTS_DEFAULT; |
|
hard_iface->wifi_flags = batadv_wifi_flags_evaluate(net_dev); |
|
if (batadv_is_wifi_hardif(hard_iface)) |
|
hard_iface->num_bcasts = BATADV_NUM_BCASTS_WIRELESS; |
|
|
|
atomic_set(&hard_iface->hop_penalty, 0); |
|
|
|
batadv_v_hardif_init(hard_iface); |
|
|
|
batadv_check_known_mac_addr(hard_iface->net_dev); |
|
kref_get(&hard_iface->refcount); |
|
list_add_tail_rcu(&hard_iface->list, &batadv_hardif_list); |
|
batadv_hardif_generation++; |
|
|
|
return hard_iface; |
|
|
|
release_dev: |
|
dev_put(net_dev); |
|
out: |
|
return NULL; |
|
} |
|
|
|
static void batadv_hardif_remove_interface(struct batadv_hard_iface *hard_iface) |
|
{ |
|
ASSERT_RTNL(); |
|
|
|
/* first deactivate interface */ |
|
if (hard_iface->if_status != BATADV_IF_NOT_IN_USE) |
|
batadv_hardif_disable_interface(hard_iface); |
|
|
|
if (hard_iface->if_status != BATADV_IF_NOT_IN_USE) |
|
return; |
|
|
|
hard_iface->if_status = BATADV_IF_TO_BE_REMOVED; |
|
batadv_hardif_put(hard_iface); |
|
} |
|
|
|
/** |
|
* batadv_hard_if_event_softif() - Handle events for soft interfaces |
|
* @event: NETDEV_* event to handle |
|
* @net_dev: net_device which generated an event |
|
* |
|
* Return: NOTIFY_* result |
|
*/ |
|
static int batadv_hard_if_event_softif(unsigned long event, |
|
struct net_device *net_dev) |
|
{ |
|
struct batadv_priv *bat_priv; |
|
|
|
switch (event) { |
|
case NETDEV_REGISTER: |
|
bat_priv = netdev_priv(net_dev); |
|
batadv_softif_create_vlan(bat_priv, BATADV_NO_FLAGS); |
|
break; |
|
} |
|
|
|
return NOTIFY_DONE; |
|
} |
|
|
|
static int batadv_hard_if_event(struct notifier_block *this, |
|
unsigned long event, void *ptr) |
|
{ |
|
struct net_device *net_dev = netdev_notifier_info_to_dev(ptr); |
|
struct batadv_hard_iface *hard_iface; |
|
struct batadv_hard_iface *primary_if = NULL; |
|
struct batadv_priv *bat_priv; |
|
|
|
if (batadv_softif_is_valid(net_dev)) |
|
return batadv_hard_if_event_softif(event, net_dev); |
|
|
|
hard_iface = batadv_hardif_get_by_netdev(net_dev); |
|
if (!hard_iface && (event == NETDEV_REGISTER || |
|
event == NETDEV_POST_TYPE_CHANGE)) |
|
hard_iface = batadv_hardif_add_interface(net_dev); |
|
|
|
if (!hard_iface) |
|
goto out; |
|
|
|
switch (event) { |
|
case NETDEV_UP: |
|
batadv_hardif_activate_interface(hard_iface); |
|
break; |
|
case NETDEV_GOING_DOWN: |
|
case NETDEV_DOWN: |
|
batadv_hardif_deactivate_interface(hard_iface); |
|
break; |
|
case NETDEV_UNREGISTER: |
|
case NETDEV_PRE_TYPE_CHANGE: |
|
list_del_rcu(&hard_iface->list); |
|
batadv_hardif_generation++; |
|
|
|
batadv_hardif_remove_interface(hard_iface); |
|
break; |
|
case NETDEV_CHANGEMTU: |
|
if (hard_iface->soft_iface) |
|
batadv_update_min_mtu(hard_iface->soft_iface); |
|
break; |
|
case NETDEV_CHANGEADDR: |
|
if (hard_iface->if_status == BATADV_IF_NOT_IN_USE) |
|
goto hardif_put; |
|
|
|
batadv_check_known_mac_addr(hard_iface->net_dev); |
|
|
|
bat_priv = netdev_priv(hard_iface->soft_iface); |
|
bat_priv->algo_ops->iface.update_mac(hard_iface); |
|
|
|
primary_if = batadv_primary_if_get_selected(bat_priv); |
|
if (!primary_if) |
|
goto hardif_put; |
|
|
|
if (hard_iface == primary_if) |
|
batadv_primary_if_update_addr(bat_priv, NULL); |
|
break; |
|
case NETDEV_CHANGEUPPER: |
|
hard_iface->wifi_flags = batadv_wifi_flags_evaluate(net_dev); |
|
if (batadv_is_wifi_hardif(hard_iface)) |
|
hard_iface->num_bcasts = BATADV_NUM_BCASTS_WIRELESS; |
|
break; |
|
default: |
|
break; |
|
} |
|
|
|
hardif_put: |
|
batadv_hardif_put(hard_iface); |
|
out: |
|
batadv_hardif_put(primary_if); |
|
return NOTIFY_DONE; |
|
} |
|
|
|
struct notifier_block batadv_hard_if_notifier = { |
|
.notifier_call = batadv_hard_if_event, |
|
};
|
|
|