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linux/net/batman-adv/multicast.c
Sven Eckelmann a7757d318a batman-adv: Use 'fallthrough' pseudo keyword 
The usage of the '/* fall through */' comments in switches are no longer
marked as non-deprecated variant of implicit fall throughs for switch
statements. The commit 294f69e662 ("compiler_attributes.h: Add
'fallthrough' pseudo keyword for switch/case use") introduced a replacement
keyword which should be used instead.

Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
2019-11-03 08:30:58 +01:00

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// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) 2014-2019 B.A.T.M.A.N. contributors:
*
* Linus Lüssing
*/
#include "multicast.h"
#include "main.h"
#include <linux/atomic.h>
#include <linux/bitops.h>
#include <linux/bug.h>
#include <linux/byteorder/generic.h>
#include <linux/errno.h>
#include <linux/etherdevice.h>
#include <linux/gfp.h>
#include <linux/icmpv6.h>
#include <linux/if_bridge.h>
#include <linux/if_ether.h>
#include <linux/igmp.h>
#include <linux/in.h>
#include <linux/in6.h>
#include <linux/inetdevice.h>
#include <linux/ip.h>
#include <linux/ipv6.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/printk.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/addrconf.h>
#include <net/genetlink.h>
#include <net/if_inet6.h>
#include <net/ip.h>
#include <net/ipv6.h>
#include <net/netlink.h>
#include <net/sock.h>
#include <uapi/linux/batadv_packet.h>
#include <uapi/linux/batman_adv.h>
#include "hard-interface.h"
#include "hash.h"
#include "log.h"
#include "netlink.h"
#include "send.h"
#include "soft-interface.h"
#include "translation-table.h"
#include "tvlv.h"
static void batadv_mcast_mla_update(struct work_struct *work);
/**
* batadv_mcast_start_timer() - schedule the multicast periodic worker
* @bat_priv: the bat priv with all the soft interface information
*/
static void batadv_mcast_start_timer(struct batadv_priv *bat_priv)
{
queue_delayed_work(batadv_event_workqueue, &bat_priv->mcast.work,
msecs_to_jiffies(BATADV_MCAST_WORK_PERIOD));
}
/**
* batadv_mcast_get_bridge() - get the bridge on top of the softif if it exists
* @soft_iface: netdev struct of the mesh interface
*
* If the given soft interface has a bridge on top then the refcount
* of the according net device is increased.
*
* Return: NULL if no such bridge exists. Otherwise the net device of the
* bridge.
*/
static struct net_device *batadv_mcast_get_bridge(struct net_device *soft_iface)
{
struct net_device *upper = soft_iface;
rcu_read_lock();
do {
upper = netdev_master_upper_dev_get_rcu(upper);
} while (upper && !(upper->priv_flags & IFF_EBRIDGE));
if (upper)
dev_hold(upper);
rcu_read_unlock();
return upper;
}
/**
* batadv_mcast_mla_rtr_flags_softif_get_ipv4() - get mcast router flags from
* node for IPv4
* @dev: the interface to check
*
* Checks the presence of an IPv4 multicast router on this node.
*
* Caller needs to hold rcu read lock.
*
* Return: BATADV_NO_FLAGS if present, BATADV_MCAST_WANT_NO_RTR4 otherwise.
*/
static u8 batadv_mcast_mla_rtr_flags_softif_get_ipv4(struct net_device *dev)
{
struct in_device *in_dev = __in_dev_get_rcu(dev);
if (in_dev && IN_DEV_MFORWARD(in_dev))
return BATADV_NO_FLAGS;
else
return BATADV_MCAST_WANT_NO_RTR4;
}
/**
* batadv_mcast_mla_rtr_flags_softif_get_ipv6() - get mcast router flags from
* node for IPv6
* @dev: the interface to check
*
* Checks the presence of an IPv6 multicast router on this node.
*
* Caller needs to hold rcu read lock.
*
* Return: BATADV_NO_FLAGS if present, BATADV_MCAST_WANT_NO_RTR6 otherwise.
*/
#if IS_ENABLED(CONFIG_IPV6_MROUTE)
static u8 batadv_mcast_mla_rtr_flags_softif_get_ipv6(struct net_device *dev)
{
struct inet6_dev *in6_dev = __in6_dev_get(dev);
if (in6_dev && in6_dev->cnf.mc_forwarding)
return BATADV_NO_FLAGS;
else
return BATADV_MCAST_WANT_NO_RTR6;
}
#else
static inline u8
batadv_mcast_mla_rtr_flags_softif_get_ipv6(struct net_device *dev)
{
return BATADV_MCAST_WANT_NO_RTR6;
}
#endif
/**
* batadv_mcast_mla_rtr_flags_softif_get() - get mcast router flags from node
* @bat_priv: the bat priv with all the soft interface information
* @bridge: bridge interface on top of the soft_iface if present,
* otherwise pass NULL
*
* Checks the presence of IPv4 and IPv6 multicast routers on this
* node.
*
* Return:
* BATADV_NO_FLAGS: Both an IPv4 and IPv6 multicast router is present
* BATADV_MCAST_WANT_NO_RTR4: No IPv4 multicast router is present
* BATADV_MCAST_WANT_NO_RTR6: No IPv6 multicast router is present
* The former two OR'd: no multicast router is present
*/
static u8 batadv_mcast_mla_rtr_flags_softif_get(struct batadv_priv *bat_priv,
struct net_device *bridge)
{
struct net_device *dev = bridge ? bridge : bat_priv->soft_iface;
u8 flags = BATADV_NO_FLAGS;
rcu_read_lock();
flags |= batadv_mcast_mla_rtr_flags_softif_get_ipv4(dev);
flags |= batadv_mcast_mla_rtr_flags_softif_get_ipv6(dev);
rcu_read_unlock();
return flags;
}
/**
* batadv_mcast_mla_rtr_flags_bridge_get() - get mcast router flags from bridge
* @bat_priv: the bat priv with all the soft interface information
* @bridge: bridge interface on top of the soft_iface if present,
* otherwise pass NULL
*
* Checks the presence of IPv4 and IPv6 multicast routers behind a bridge.
*
* Return:
* BATADV_NO_FLAGS: Both an IPv4 and IPv6 multicast router is present
* BATADV_MCAST_WANT_NO_RTR4: No IPv4 multicast router is present
* BATADV_MCAST_WANT_NO_RTR6: No IPv6 multicast router is present
* The former two OR'd: no multicast router is present
*/
#if IS_ENABLED(CONFIG_IPV6)
static u8 batadv_mcast_mla_rtr_flags_bridge_get(struct batadv_priv *bat_priv,
struct net_device *bridge)
{
struct list_head bridge_mcast_list = LIST_HEAD_INIT(bridge_mcast_list);
struct net_device *dev = bat_priv->soft_iface;
struct br_ip_list *br_ip_entry, *tmp;
u8 flags = BATADV_MCAST_WANT_NO_RTR6;
int ret;
if (!bridge)
return BATADV_MCAST_WANT_NO_RTR4 | BATADV_MCAST_WANT_NO_RTR6;
/* TODO: ask the bridge if a multicast router is present (the bridge
* is capable of performing proper RFC4286 multicast multicast router
* discovery) instead of searching for a ff02::2 listener here
*/
ret = br_multicast_list_adjacent(dev, &bridge_mcast_list);
if (ret < 0)
return BATADV_NO_FLAGS;
list_for_each_entry_safe(br_ip_entry, tmp, &bridge_mcast_list, list) {
/* the bridge snooping does not maintain IPv4 link-local
* addresses - therefore we won't find any IPv4 multicast router
* address here, only IPv6 ones
*/
if (br_ip_entry->addr.proto == htons(ETH_P_IPV6) &&
ipv6_addr_is_ll_all_routers(&br_ip_entry->addr.u.ip6))
flags &= ~BATADV_MCAST_WANT_NO_RTR6;
list_del(&br_ip_entry->list);
kfree(br_ip_entry);
}
return flags;
}
#else
static inline u8
batadv_mcast_mla_rtr_flags_bridge_get(struct batadv_priv *bat_priv,
struct net_device *bridge)
{
if (bridge)
return BATADV_NO_FLAGS;
else
return BATADV_MCAST_WANT_NO_RTR4 | BATADV_MCAST_WANT_NO_RTR6;
}
#endif
/**
* batadv_mcast_mla_rtr_flags_get() - get multicast router flags
* @bat_priv: the bat priv with all the soft interface information
* @bridge: bridge interface on top of the soft_iface if present,
* otherwise pass NULL
*
* Checks the presence of IPv4 and IPv6 multicast routers on this
* node or behind its bridge.
*
* Return:
* BATADV_NO_FLAGS: Both an IPv4 and IPv6 multicast router is present
* BATADV_MCAST_WANT_NO_RTR4: No IPv4 multicast router is present
* BATADV_MCAST_WANT_NO_RTR6: No IPv6 multicast router is present
* The former two OR'd: no multicast router is present
*/
static u8 batadv_mcast_mla_rtr_flags_get(struct batadv_priv *bat_priv,
struct net_device *bridge)
{
u8 flags = BATADV_MCAST_WANT_NO_RTR4 | BATADV_MCAST_WANT_NO_RTR6;
flags &= batadv_mcast_mla_rtr_flags_softif_get(bat_priv, bridge);
flags &= batadv_mcast_mla_rtr_flags_bridge_get(bat_priv, bridge);
return flags;
}
/**
* batadv_mcast_mla_flags_get() - get the new multicast flags
* @bat_priv: the bat priv with all the soft interface information
*
* Return: A set of flags for the current/next TVLV, querier and
* bridge state.
*/
static struct batadv_mcast_mla_flags
batadv_mcast_mla_flags_get(struct batadv_priv *bat_priv)
{
struct net_device *dev = bat_priv->soft_iface;
struct batadv_mcast_querier_state *qr4, *qr6;
struct batadv_mcast_mla_flags mla_flags;
struct net_device *bridge;
bridge = batadv_mcast_get_bridge(dev);
memset(&mla_flags, 0, sizeof(mla_flags));
mla_flags.enabled = 1;
mla_flags.tvlv_flags |= batadv_mcast_mla_rtr_flags_get(bat_priv,
bridge);
if (!bridge)
return mla_flags;
dev_put(bridge);
mla_flags.bridged = 1;
qr4 = &mla_flags.querier_ipv4;
qr6 = &mla_flags.querier_ipv6;
if (!IS_ENABLED(CONFIG_BRIDGE_IGMP_SNOOPING))
pr_warn_once("No bridge IGMP snooping compiled - multicast optimizations disabled\n");
qr4->exists = br_multicast_has_querier_anywhere(dev, ETH_P_IP);
qr4->shadowing = br_multicast_has_querier_adjacent(dev, ETH_P_IP);
qr6->exists = br_multicast_has_querier_anywhere(dev, ETH_P_IPV6);
qr6->shadowing = br_multicast_has_querier_adjacent(dev, ETH_P_IPV6);
mla_flags.tvlv_flags |= BATADV_MCAST_WANT_ALL_UNSNOOPABLES;
/* 1) If no querier exists at all, then multicast listeners on
* our local TT clients behind the bridge will keep silent.
* 2) If the selected querier is on one of our local TT clients,
* behind the bridge, then this querier might shadow multicast
* listeners on our local TT clients, behind this bridge.
*
* In both cases, we will signalize other batman nodes that
* we need all multicast traffic of the according protocol.
*/
if (!qr4->exists || qr4->shadowing) {
mla_flags.tvlv_flags |= BATADV_MCAST_WANT_ALL_IPV4;
mla_flags.tvlv_flags &= ~BATADV_MCAST_WANT_NO_RTR4;
}
if (!qr6->exists || qr6->shadowing) {
mla_flags.tvlv_flags |= BATADV_MCAST_WANT_ALL_IPV6;
mla_flags.tvlv_flags &= ~BATADV_MCAST_WANT_NO_RTR6;
}
return mla_flags;
}
/**
* batadv_mcast_mla_is_duplicate() - check whether an address is in a list
* @mcast_addr: the multicast address to check
* @mcast_list: the list with multicast addresses to search in
*
* Return: true if the given address is already in the given list.
* Otherwise returns false.
*/
static bool batadv_mcast_mla_is_duplicate(u8 *mcast_addr,
struct hlist_head *mcast_list)
{
struct batadv_hw_addr *mcast_entry;
hlist_for_each_entry(mcast_entry, mcast_list, list)
if (batadv_compare_eth(mcast_entry->addr, mcast_addr))
return true;
return false;
}
/**
* batadv_mcast_mla_softif_get_ipv4() - get softif IPv4 multicast listeners
* @dev: the device to collect multicast addresses from
* @mcast_list: a list to put found addresses into
* @flags: flags indicating the new multicast state
*
* Collects multicast addresses of IPv4 multicast listeners residing
* on this kernel on the given soft interface, dev, in
* the given mcast_list. In general, multicast listeners provided by
* your multicast receiving applications run directly on this node.
*
* Return: -ENOMEM on memory allocation error or the number of
* items added to the mcast_list otherwise.
*/
static int
batadv_mcast_mla_softif_get_ipv4(struct net_device *dev,
struct hlist_head *mcast_list,
struct batadv_mcast_mla_flags *flags)
{
struct batadv_hw_addr *new;
struct in_device *in_dev;
u8 mcast_addr[ETH_ALEN];
struct ip_mc_list *pmc;
int ret = 0;
if (flags->tvlv_flags & BATADV_MCAST_WANT_ALL_IPV4)
return 0;
rcu_read_lock();
in_dev = __in_dev_get_rcu(dev);
if (!in_dev) {
rcu_read_unlock();
return 0;
}
for (pmc = rcu_dereference(in_dev->mc_list); pmc;
pmc = rcu_dereference(pmc->next_rcu)) {
if (flags->tvlv_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES &&
ipv4_is_local_multicast(pmc->multiaddr))
continue;
if (!(flags->tvlv_flags & BATADV_MCAST_WANT_NO_RTR4) &&
!ipv4_is_local_multicast(pmc->multiaddr))
continue;
ip_eth_mc_map(pmc->multiaddr, mcast_addr);
if (batadv_mcast_mla_is_duplicate(mcast_addr, mcast_list))
continue;
new = kmalloc(sizeof(*new), GFP_ATOMIC);
if (!new) {
ret = -ENOMEM;
break;
}
ether_addr_copy(new->addr, mcast_addr);
hlist_add_head(&new->list, mcast_list);
ret++;
}
rcu_read_unlock();
return ret;
}
/**
* batadv_mcast_mla_softif_get_ipv6() - get softif IPv6 multicast listeners
* @dev: the device to collect multicast addresses from
* @mcast_list: a list to put found addresses into
* @flags: flags indicating the new multicast state
*
* Collects multicast addresses of IPv6 multicast listeners residing
* on this kernel on the given soft interface, dev, in
* the given mcast_list. In general, multicast listeners provided by
* your multicast receiving applications run directly on this node.
*
* Return: -ENOMEM on memory allocation error or the number of
* items added to the mcast_list otherwise.
*/
#if IS_ENABLED(CONFIG_IPV6)
static int
batadv_mcast_mla_softif_get_ipv6(struct net_device *dev,
struct hlist_head *mcast_list,
struct batadv_mcast_mla_flags *flags)
{
struct batadv_hw_addr *new;
struct inet6_dev *in6_dev;
u8 mcast_addr[ETH_ALEN];
struct ifmcaddr6 *pmc6;
int ret = 0;
if (flags->tvlv_flags & BATADV_MCAST_WANT_ALL_IPV6)
return 0;
rcu_read_lock();
in6_dev = __in6_dev_get(dev);
if (!in6_dev) {
rcu_read_unlock();
return 0;
}
read_lock_bh(&in6_dev->lock);
for (pmc6 = in6_dev->mc_list; pmc6; pmc6 = pmc6->next) {
if (IPV6_ADDR_MC_SCOPE(&pmc6->mca_addr) <
IPV6_ADDR_SCOPE_LINKLOCAL)
continue;
if (flags->tvlv_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES &&
ipv6_addr_is_ll_all_nodes(&pmc6->mca_addr))
continue;
if (!(flags->tvlv_flags & BATADV_MCAST_WANT_NO_RTR6) &&
IPV6_ADDR_MC_SCOPE(&pmc6->mca_addr) >
IPV6_ADDR_SCOPE_LINKLOCAL)
continue;
ipv6_eth_mc_map(&pmc6->mca_addr, mcast_addr);
if (batadv_mcast_mla_is_duplicate(mcast_addr, mcast_list))
continue;
new = kmalloc(sizeof(*new), GFP_ATOMIC);
if (!new) {
ret = -ENOMEM;
break;
}
ether_addr_copy(new->addr, mcast_addr);
hlist_add_head(&new->list, mcast_list);
ret++;
}
read_unlock_bh(&in6_dev->lock);
rcu_read_unlock();
return ret;
}
#else
static inline int
batadv_mcast_mla_softif_get_ipv6(struct net_device *dev,
struct hlist_head *mcast_list,
struct batadv_mcast_mla_flags *flags)
{
return 0;
}
#endif
/**
* batadv_mcast_mla_softif_get() - get softif multicast listeners
* @dev: the device to collect multicast addresses from
* @mcast_list: a list to put found addresses into
* @flags: flags indicating the new multicast state
*
* Collects multicast addresses of multicast listeners residing
* on this kernel on the given soft interface, dev, in
* the given mcast_list. In general, multicast listeners provided by
* your multicast receiving applications run directly on this node.
*
* If there is a bridge interface on top of dev, collects from that one
* instead. Just like with IP addresses and routes, multicast listeners
* will(/should) register to the bridge interface instead of an
* enslaved bat0.
*
* Return: -ENOMEM on memory allocation error or the number of
* items added to the mcast_list otherwise.
*/
static int
batadv_mcast_mla_softif_get(struct net_device *dev,
struct hlist_head *mcast_list,
struct batadv_mcast_mla_flags *flags)
{
struct net_device *bridge = batadv_mcast_get_bridge(dev);
int ret4, ret6 = 0;
if (bridge)
dev = bridge;
ret4 = batadv_mcast_mla_softif_get_ipv4(dev, mcast_list, flags);
if (ret4 < 0)
goto out;
ret6 = batadv_mcast_mla_softif_get_ipv6(dev, mcast_list, flags);
if (ret6 < 0) {
ret4 = 0;
goto out;
}
out:
if (bridge)
dev_put(bridge);
return ret4 + ret6;
}
/**
* batadv_mcast_mla_br_addr_cpy() - copy a bridge multicast address
* @dst: destination to write to - a multicast MAC address
* @src: source to read from - a multicast IP address
*
* Converts a given multicast IPv4/IPv6 address from a bridge
* to its matching multicast MAC address and copies it into the given
* destination buffer.
*
* Caller needs to make sure the destination buffer can hold
* at least ETH_ALEN bytes.
*/
static void batadv_mcast_mla_br_addr_cpy(char *dst, const struct br_ip *src)
{
if (src->proto == htons(ETH_P_IP))
ip_eth_mc_map(src->u.ip4, dst);
#if IS_ENABLED(CONFIG_IPV6)
else if (src->proto == htons(ETH_P_IPV6))
ipv6_eth_mc_map(&src->u.ip6, dst);
#endif
else
eth_zero_addr(dst);
}
/**
* batadv_mcast_mla_bridge_get() - get bridged-in multicast listeners
* @dev: a bridge slave whose bridge to collect multicast addresses from
* @mcast_list: a list to put found addresses into
* @flags: flags indicating the new multicast state
*
* Collects multicast addresses of multicast listeners residing
* on foreign, non-mesh devices which we gave access to our mesh via
* a bridge on top of the given soft interface, dev, in the given
* mcast_list.
*
* Return: -ENOMEM on memory allocation error or the number of
* items added to the mcast_list otherwise.
*/
static int batadv_mcast_mla_bridge_get(struct net_device *dev,
struct hlist_head *mcast_list,
struct batadv_mcast_mla_flags *flags)
{
struct list_head bridge_mcast_list = LIST_HEAD_INIT(bridge_mcast_list);
struct br_ip_list *br_ip_entry, *tmp;
u8 tvlv_flags = flags->tvlv_flags;
struct batadv_hw_addr *new;
u8 mcast_addr[ETH_ALEN];
int ret;
/* we don't need to detect these devices/listeners, the IGMP/MLD
* snooping code of the Linux bridge already does that for us
*/
ret = br_multicast_list_adjacent(dev, &bridge_mcast_list);
if (ret < 0)
goto out;
list_for_each_entry(br_ip_entry, &bridge_mcast_list, list) {
if (br_ip_entry->addr.proto == htons(ETH_P_IP)) {
if (tvlv_flags & BATADV_MCAST_WANT_ALL_IPV4)
continue;
if (tvlv_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES &&
ipv4_is_local_multicast(br_ip_entry->addr.u.ip4))
continue;
if (!(tvlv_flags & BATADV_MCAST_WANT_NO_RTR4) &&
!ipv4_is_local_multicast(br_ip_entry->addr.u.ip4))
continue;
}
#if IS_ENABLED(CONFIG_IPV6)
if (br_ip_entry->addr.proto == htons(ETH_P_IPV6)) {
if (tvlv_flags & BATADV_MCAST_WANT_ALL_IPV6)
continue;
if (tvlv_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES &&
ipv6_addr_is_ll_all_nodes(&br_ip_entry->addr.u.ip6))
continue;
if (!(tvlv_flags & BATADV_MCAST_WANT_NO_RTR6) &&
IPV6_ADDR_MC_SCOPE(&br_ip_entry->addr.u.ip6) >
IPV6_ADDR_SCOPE_LINKLOCAL)
continue;
}
#endif
batadv_mcast_mla_br_addr_cpy(mcast_addr, &br_ip_entry->addr);
if (batadv_mcast_mla_is_duplicate(mcast_addr, mcast_list))
continue;
new = kmalloc(sizeof(*new), GFP_ATOMIC);
if (!new) {
ret = -ENOMEM;
break;
}
ether_addr_copy(new->addr, mcast_addr);
hlist_add_head(&new->list, mcast_list);
}
out:
list_for_each_entry_safe(br_ip_entry, tmp, &bridge_mcast_list, list) {
list_del(&br_ip_entry->list);
kfree(br_ip_entry);
}
return ret;
}
/**
* batadv_mcast_mla_list_free() - free a list of multicast addresses
* @mcast_list: the list to free
*
* Removes and frees all items in the given mcast_list.
*/
static void batadv_mcast_mla_list_free(struct hlist_head *mcast_list)
{
struct batadv_hw_addr *mcast_entry;
struct hlist_node *tmp;
hlist_for_each_entry_safe(mcast_entry, tmp, mcast_list, list) {
hlist_del(&mcast_entry->list);
kfree(mcast_entry);
}
}
/**
* batadv_mcast_mla_tt_retract() - clean up multicast listener announcements
* @bat_priv: the bat priv with all the soft interface information
* @mcast_list: a list of addresses which should _not_ be removed
*
* Retracts the announcement of any multicast listener from the
* translation table except the ones listed in the given mcast_list.
*
* If mcast_list is NULL then all are retracted.
*/
static void batadv_mcast_mla_tt_retract(struct batadv_priv *bat_priv,
struct hlist_head *mcast_list)
{
struct batadv_hw_addr *mcast_entry;
struct hlist_node *tmp;
hlist_for_each_entry_safe(mcast_entry, tmp, &bat_priv->mcast.mla_list,
list) {
if (mcast_list &&
batadv_mcast_mla_is_duplicate(mcast_entry->addr,
mcast_list))
continue;
batadv_tt_local_remove(bat_priv, mcast_entry->addr,
BATADV_NO_FLAGS,
"mcast TT outdated", false);
hlist_del(&mcast_entry->list);
kfree(mcast_entry);
}
}
/**
* batadv_mcast_mla_tt_add() - add multicast listener announcements
* @bat_priv: the bat priv with all the soft interface information
* @mcast_list: a list of addresses which are going to get added
*
* Adds multicast listener announcements from the given mcast_list to the
* translation table if they have not been added yet.
*/
static void batadv_mcast_mla_tt_add(struct batadv_priv *bat_priv,
struct hlist_head *mcast_list)
{
struct batadv_hw_addr *mcast_entry;
struct hlist_node *tmp;
if (!mcast_list)
return;
hlist_for_each_entry_safe(mcast_entry, tmp, mcast_list, list) {
if (batadv_mcast_mla_is_duplicate(mcast_entry->addr,
&bat_priv->mcast.mla_list))
continue;
if (!batadv_tt_local_add(bat_priv->soft_iface,
mcast_entry->addr, BATADV_NO_FLAGS,
BATADV_NULL_IFINDEX, BATADV_NO_MARK))
continue;
hlist_del(&mcast_entry->list);
hlist_add_head(&mcast_entry->list, &bat_priv->mcast.mla_list);
}
}
/**
* batadv_mcast_querier_log() - debug output regarding the querier status on
* link
* @bat_priv: the bat priv with all the soft interface information
* @str_proto: a string for the querier protocol (e.g. "IGMP" or "MLD")
* @old_state: the previous querier state on our link
* @new_state: the new querier state on our link
*
* Outputs debug messages to the logging facility with log level 'mcast'
* regarding changes to the querier status on the link which are relevant
* to our multicast optimizations.
*
* Usually this is about whether a querier appeared or vanished in
* our mesh or whether the querier is in the suboptimal position of being
* behind our local bridge segment: Snooping switches will directly
* forward listener reports to the querier, therefore batman-adv and
* the bridge will potentially not see these listeners - the querier is
* potentially shadowing listeners from us then.
*
* This is only interesting for nodes with a bridge on top of their
* soft interface.
*/
static void
batadv_mcast_querier_log(struct batadv_priv *bat_priv, char *str_proto,
struct batadv_mcast_querier_state *old_state,
struct batadv_mcast_querier_state *new_state)
{
if (!old_state->exists && new_state->exists)
batadv_info(bat_priv->soft_iface, "%s Querier appeared\n",
str_proto);
else if (old_state->exists && !new_state->exists)
batadv_info(bat_priv->soft_iface,
"%s Querier disappeared - multicast optimizations disabled\n",
str_proto);
else if (!bat_priv->mcast.mla_flags.bridged && !new_state->exists)
batadv_info(bat_priv->soft_iface,
"No %s Querier present - multicast optimizations disabled\n",
str_proto);
if (new_state->exists) {
if ((!old_state->shadowing && new_state->shadowing) ||
(!old_state->exists && new_state->shadowing))
batadv_dbg(BATADV_DBG_MCAST, bat_priv,
"%s Querier is behind our bridged segment: Might shadow listeners\n",
str_proto);
else if (old_state->shadowing && !new_state->shadowing)
batadv_dbg(BATADV_DBG_MCAST, bat_priv,
"%s Querier is not behind our bridged segment\n",
str_proto);
}
}
/**
* batadv_mcast_bridge_log() - debug output for topology changes in bridged
* setups
* @bat_priv: the bat priv with all the soft interface information
* @new_flags: flags indicating the new multicast state
*
* If no bridges are ever used on this node, then this function does nothing.
*
* Otherwise this function outputs debug information to the 'mcast' log level
* which might be relevant to our multicast optimizations.
*
* More precisely, it outputs information when a bridge interface is added or
* removed from a soft interface. And when a bridge is present, it further
* outputs information about the querier state which is relevant for the
* multicast flags this node is going to set.
*/
static void
batadv_mcast_bridge_log(struct batadv_priv *bat_priv,
struct batadv_mcast_mla_flags *new_flags)
{
struct batadv_mcast_mla_flags *old_flags = &bat_priv->mcast.mla_flags;
if (!old_flags->bridged && new_flags->bridged)
batadv_dbg(BATADV_DBG_MCAST, bat_priv,
"Bridge added: Setting Unsnoopables(U)-flag\n");
else if (old_flags->bridged && !new_flags->bridged)
batadv_dbg(BATADV_DBG_MCAST, bat_priv,
"Bridge removed: Unsetting Unsnoopables(U)-flag\n");
if (new_flags->bridged) {
batadv_mcast_querier_log(bat_priv, "IGMP",
&old_flags->querier_ipv4,
&new_flags->querier_ipv4);
batadv_mcast_querier_log(bat_priv, "MLD",
&old_flags->querier_ipv6,
&new_flags->querier_ipv6);
}
}
/**
* batadv_mcast_flags_logs() - output debug information about mcast flag changes
* @bat_priv: the bat priv with all the soft interface information
* @flags: TVLV flags indicating the new multicast state
*
* Whenever the multicast TVLV flags this nodes announces change this notifies
* userspace via the 'mcast' log level.
*/
static void batadv_mcast_flags_log(struct batadv_priv *bat_priv, u8 flags)
{
bool old_enabled = bat_priv->mcast.mla_flags.enabled;
u8 old_flags = bat_priv->mcast.mla_flags.tvlv_flags;
char str_old_flags[] = "[.... . ]";
sprintf(str_old_flags, "[%c%c%c%s%s]",
(old_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) ? 'U' : '.',
(old_flags & BATADV_MCAST_WANT_ALL_IPV4) ? '4' : '.',
(old_flags & BATADV_MCAST_WANT_ALL_IPV6) ? '6' : '.',
!(old_flags & BATADV_MCAST_WANT_NO_RTR4) ? "R4" : ". ",
!(old_flags & BATADV_MCAST_WANT_NO_RTR6) ? "R6" : ". ");
batadv_dbg(BATADV_DBG_MCAST, bat_priv,
"Changing multicast flags from '%s' to '[%c%c%c%s%s]'\n",
old_enabled ? str_old_flags : "<undefined>",
(flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) ? 'U' : '.',
(flags & BATADV_MCAST_WANT_ALL_IPV4) ? '4' : '.',
(flags & BATADV_MCAST_WANT_ALL_IPV6) ? '6' : '.',
!(flags & BATADV_MCAST_WANT_NO_RTR4) ? "R4" : ". ",
!(flags & BATADV_MCAST_WANT_NO_RTR6) ? "R6" : ". ");
}
/**
* batadv_mcast_mla_flags_update() - update multicast flags
* @bat_priv: the bat priv with all the soft interface information
* @flags: flags indicating the new multicast state
*
* Updates the own multicast tvlv with our current multicast related settings,
* capabilities and inabilities.
*/
static void
batadv_mcast_mla_flags_update(struct batadv_priv *bat_priv,
struct batadv_mcast_mla_flags *flags)
{
struct batadv_tvlv_mcast_data mcast_data;
if (!memcmp(flags, &bat_priv->mcast.mla_flags, sizeof(*flags)))
return;
batadv_mcast_bridge_log(bat_priv, flags);
batadv_mcast_flags_log(bat_priv, flags->tvlv_flags);
mcast_data.flags = flags->tvlv_flags;
memset(mcast_data.reserved, 0, sizeof(mcast_data.reserved));
batadv_tvlv_container_register(bat_priv, BATADV_TVLV_MCAST, 2,
&mcast_data, sizeof(mcast_data));
bat_priv->mcast.mla_flags = *flags;
}
/**
* __batadv_mcast_mla_update() - update the own MLAs
* @bat_priv: the bat priv with all the soft interface information
*
* Updates the own multicast listener announcements in the translation
* table as well as the own, announced multicast tvlv container.
*
* Note that non-conflicting reads and writes to bat_priv->mcast.mla_list
* in batadv_mcast_mla_tt_retract() and batadv_mcast_mla_tt_add() are
* ensured by the non-parallel execution of the worker this function
* belongs to.
*/
static void __batadv_mcast_mla_update(struct batadv_priv *bat_priv)
{
struct net_device *soft_iface = bat_priv->soft_iface;
struct hlist_head mcast_list = HLIST_HEAD_INIT;
struct batadv_mcast_mla_flags flags;
int ret;
flags = batadv_mcast_mla_flags_get(bat_priv);
ret = batadv_mcast_mla_softif_get(soft_iface, &mcast_list, &flags);
if (ret < 0)
goto out;
ret = batadv_mcast_mla_bridge_get(soft_iface, &mcast_list, &flags);
if (ret < 0)
goto out;
spin_lock(&bat_priv->mcast.mla_lock);
batadv_mcast_mla_tt_retract(bat_priv, &mcast_list);
batadv_mcast_mla_tt_add(bat_priv, &mcast_list);
batadv_mcast_mla_flags_update(bat_priv, &flags);
spin_unlock(&bat_priv->mcast.mla_lock);
out:
batadv_mcast_mla_list_free(&mcast_list);
}
/**
* batadv_mcast_mla_update() - update the own MLAs
* @work: kernel work struct
*
* Updates the own multicast listener announcements in the translation
* table as well as the own, announced multicast tvlv container.
*
* In the end, reschedules the work timer.
*/
static void batadv_mcast_mla_update(struct work_struct *work)
{
struct delayed_work *delayed_work;
struct batadv_priv_mcast *priv_mcast;
struct batadv_priv *bat_priv;
delayed_work = to_delayed_work(work);
priv_mcast = container_of(delayed_work, struct batadv_priv_mcast, work);
bat_priv = container_of(priv_mcast, struct batadv_priv, mcast);
__batadv_mcast_mla_update(bat_priv);
batadv_mcast_start_timer(bat_priv);
}
/**
* batadv_mcast_is_report_ipv4() - check for IGMP reports
* @skb: the ethernet frame destined for the mesh
*
* This call might reallocate skb data.
*
* Checks whether the given frame is a valid IGMP report.
*
* Return: If so then true, otherwise false.
*/
static bool batadv_mcast_is_report_ipv4(struct sk_buff *skb)
{
if (ip_mc_check_igmp(skb) < 0)
return false;
switch (igmp_hdr(skb)->type) {
case IGMP_HOST_MEMBERSHIP_REPORT:
case IGMPV2_HOST_MEMBERSHIP_REPORT:
case IGMPV3_HOST_MEMBERSHIP_REPORT:
return true;
}
return false;
}
/**
* batadv_mcast_forw_mode_check_ipv4() - check for optimized forwarding
* potential
* @bat_priv: the bat priv with all the soft interface information
* @skb: the IPv4 packet to check
* @is_unsnoopable: stores whether the destination is snoopable
* @is_routable: stores whether the destination is routable
*
* Checks whether the given IPv4 packet has the potential to be forwarded with a
* mode more optimal than classic flooding.
*
* Return: If so then 0. Otherwise -EINVAL or -ENOMEM in case of memory
* allocation failure.
*/
static int batadv_mcast_forw_mode_check_ipv4(struct batadv_priv *bat_priv,
struct sk_buff *skb,
bool *is_unsnoopable,
int *is_routable)
{
struct iphdr *iphdr;
/* We might fail due to out-of-memory -> drop it */
if (!pskb_may_pull(skb, sizeof(struct ethhdr) + sizeof(*iphdr)))
return -ENOMEM;
if (batadv_mcast_is_report_ipv4(skb))
return -EINVAL;
iphdr = ip_hdr(skb);
/* link-local multicast listeners behind a bridge are
* not snoopable (see RFC4541, section 2.1.2.2)
*/
if (ipv4_is_local_multicast(iphdr->daddr))
*is_unsnoopable = true;
else
*is_routable = ETH_P_IP;
return 0;
}
/**
* batadv_mcast_is_report_ipv6() - check for MLD reports
* @skb: the ethernet frame destined for the mesh
*
* This call might reallocate skb data.
*
* Checks whether the given frame is a valid MLD report.
*
* Return: If so then true, otherwise false.
*/
static bool batadv_mcast_is_report_ipv6(struct sk_buff *skb)
{
if (ipv6_mc_check_mld(skb) < 0)
return false;
switch (icmp6_hdr(skb)->icmp6_type) {
case ICMPV6_MGM_REPORT:
case ICMPV6_MLD2_REPORT:
return true;
}
return false;
}
/**
* batadv_mcast_forw_mode_check_ipv6() - check for optimized forwarding
* potential
* @bat_priv: the bat priv with all the soft interface information
* @skb: the IPv6 packet to check
* @is_unsnoopable: stores whether the destination is snoopable
* @is_routable: stores whether the destination is routable
*
* Checks whether the given IPv6 packet has the potential to be forwarded with a
* mode more optimal than classic flooding.
*
* Return: If so then 0. Otherwise -EINVAL is or -ENOMEM if we are out of memory
*/
static int batadv_mcast_forw_mode_check_ipv6(struct batadv_priv *bat_priv,
struct sk_buff *skb,
bool *is_unsnoopable,
int *is_routable)
{
struct ipv6hdr *ip6hdr;
/* We might fail due to out-of-memory -> drop it */
if (!pskb_may_pull(skb, sizeof(struct ethhdr) + sizeof(*ip6hdr)))
return -ENOMEM;
if (batadv_mcast_is_report_ipv6(skb))
return -EINVAL;
ip6hdr = ipv6_hdr(skb);
if (IPV6_ADDR_MC_SCOPE(&ip6hdr->daddr) < IPV6_ADDR_SCOPE_LINKLOCAL)
return -EINVAL;
/* link-local-all-nodes multicast listeners behind a bridge are
* not snoopable (see RFC4541, section 3, paragraph 3)
*/
if (ipv6_addr_is_ll_all_nodes(&ip6hdr->daddr))
*is_unsnoopable = true;
else if (IPV6_ADDR_MC_SCOPE(&ip6hdr->daddr) > IPV6_ADDR_SCOPE_LINKLOCAL)
*is_routable = ETH_P_IPV6;
return 0;
}
/**
* batadv_mcast_forw_mode_check() - check for optimized forwarding potential
* @bat_priv: the bat priv with all the soft interface information
* @skb: the multicast frame to check
* @is_unsnoopable: stores whether the destination is snoopable
* @is_routable: stores whether the destination is routable
*
* Checks whether the given multicast ethernet frame has the potential to be
* forwarded with a mode more optimal than classic flooding.
*
* Return: If so then 0. Otherwise -EINVAL is or -ENOMEM if we are out of memory
*/
static int batadv_mcast_forw_mode_check(struct batadv_priv *bat_priv,
struct sk_buff *skb,
bool *is_unsnoopable,
int *is_routable)
{
struct ethhdr *ethhdr = eth_hdr(skb);
if (!atomic_read(&bat_priv->multicast_mode))
return -EINVAL;
switch (ntohs(ethhdr->h_proto)) {
case ETH_P_IP:
return batadv_mcast_forw_mode_check_ipv4(bat_priv, skb,
is_unsnoopable,
is_routable);
case ETH_P_IPV6:
if (!IS_ENABLED(CONFIG_IPV6))
return -EINVAL;
return batadv_mcast_forw_mode_check_ipv6(bat_priv, skb,
is_unsnoopable,
is_routable);
default:
return -EINVAL;
}
}
/**
* batadv_mcast_forw_want_all_ip_count() - count nodes with unspecific mcast
* interest
* @bat_priv: the bat priv with all the soft interface information
* @ethhdr: ethernet header of a packet
*
* Return: the number of nodes which want all IPv4 multicast traffic if the
* given ethhdr is from an IPv4 packet or the number of nodes which want all
* IPv6 traffic if it matches an IPv6 packet.
*/
static int batadv_mcast_forw_want_all_ip_count(struct batadv_priv *bat_priv,
struct ethhdr *ethhdr)
{
switch (ntohs(ethhdr->h_proto)) {
case ETH_P_IP:
return atomic_read(&bat_priv->mcast.num_want_all_ipv4);
case ETH_P_IPV6:
return atomic_read(&bat_priv->mcast.num_want_all_ipv6);
default:
/* we shouldn't be here... */
return 0;
}
}
/**
* batadv_mcast_forw_rtr_count() - count nodes with a multicast router
* @bat_priv: the bat priv with all the soft interface information
* @protocol: the ethernet protocol type to count multicast routers for
*
* Return: the number of nodes which want all routable IPv4 multicast traffic
* if the protocol is ETH_P_IP or the number of nodes which want all routable
* IPv6 traffic if the protocol is ETH_P_IPV6. Otherwise returns 0.
*/
static int batadv_mcast_forw_rtr_count(struct batadv_priv *bat_priv,
int protocol)
{
switch (protocol) {
case ETH_P_IP:
return atomic_read(&bat_priv->mcast.num_want_all_rtr4);
case ETH_P_IPV6:
return atomic_read(&bat_priv->mcast.num_want_all_rtr6);
default:
return 0;
}
}
/**
* batadv_mcast_forw_tt_node_get() - get a multicast tt node
* @bat_priv: the bat priv with all the soft interface information
* @ethhdr: the ether header containing the multicast destination
*
* Return: an orig_node matching the multicast address provided by ethhdr
* via a translation table lookup. This increases the returned nodes refcount.
*/
static struct batadv_orig_node *
batadv_mcast_forw_tt_node_get(struct batadv_priv *bat_priv,
struct ethhdr *ethhdr)
{
return batadv_transtable_search(bat_priv, NULL, ethhdr->h_dest,
BATADV_NO_FLAGS);
}
/**
* batadv_mcast_forw_ipv4_node_get() - get a node with an ipv4 flag
* @bat_priv: the bat priv with all the soft interface information
*
* Return: an orig_node which has the BATADV_MCAST_WANT_ALL_IPV4 flag set and
* increases its refcount.
*/
static struct batadv_orig_node *
batadv_mcast_forw_ipv4_node_get(struct batadv_priv *bat_priv)
{
struct batadv_orig_node *tmp_orig_node, *orig_node = NULL;
rcu_read_lock();
hlist_for_each_entry_rcu(tmp_orig_node,
&bat_priv->mcast.want_all_ipv4_list,
mcast_want_all_ipv4_node) {
if (!kref_get_unless_zero(&tmp_orig_node->refcount))
continue;
orig_node = tmp_orig_node;
break;
}
rcu_read_unlock();
return orig_node;
}
/**
* batadv_mcast_forw_ipv6_node_get() - get a node with an ipv6 flag
* @bat_priv: the bat priv with all the soft interface information
*
* Return: an orig_node which has the BATADV_MCAST_WANT_ALL_IPV6 flag set
* and increases its refcount.
*/
static struct batadv_orig_node *
batadv_mcast_forw_ipv6_node_get(struct batadv_priv *bat_priv)
{
struct batadv_orig_node *tmp_orig_node, *orig_node = NULL;
rcu_read_lock();
hlist_for_each_entry_rcu(tmp_orig_node,
&bat_priv->mcast.want_all_ipv6_list,
mcast_want_all_ipv6_node) {
if (!kref_get_unless_zero(&tmp_orig_node->refcount))
continue;
orig_node = tmp_orig_node;
break;
}
rcu_read_unlock();
return orig_node;
}
/**
* batadv_mcast_forw_ip_node_get() - get a node with an ipv4/ipv6 flag
* @bat_priv: the bat priv with all the soft interface information
* @ethhdr: an ethernet header to determine the protocol family from
*
* Return: an orig_node which has the BATADV_MCAST_WANT_ALL_IPV4 or
* BATADV_MCAST_WANT_ALL_IPV6 flag, depending on the provided ethhdr, set and
* increases its refcount.
*/
static struct batadv_orig_node *
batadv_mcast_forw_ip_node_get(struct batadv_priv *bat_priv,
struct ethhdr *ethhdr)
{
switch (ntohs(ethhdr->h_proto)) {
case ETH_P_IP:
return batadv_mcast_forw_ipv4_node_get(bat_priv);
case ETH_P_IPV6:
return batadv_mcast_forw_ipv6_node_get(bat_priv);
default:
/* we shouldn't be here... */
return NULL;
}
}
/**
* batadv_mcast_forw_unsnoop_node_get() - get a node with an unsnoopable flag
* @bat_priv: the bat priv with all the soft interface information
*
* Return: an orig_node which has the BATADV_MCAST_WANT_ALL_UNSNOOPABLES flag
* set and increases its refcount.
*/
static struct batadv_orig_node *
batadv_mcast_forw_unsnoop_node_get(struct batadv_priv *bat_priv)
{
struct batadv_orig_node *tmp_orig_node, *orig_node = NULL;
rcu_read_lock();
hlist_for_each_entry_rcu(tmp_orig_node,
&bat_priv->mcast.want_all_unsnoopables_list,
mcast_want_all_unsnoopables_node) {
if (!kref_get_unless_zero(&tmp_orig_node->refcount))
continue;
orig_node = tmp_orig_node;
break;
}
rcu_read_unlock();
return orig_node;
}
/**
* batadv_mcast_forw_rtr4_node_get() - get a node with an ipv4 mcast router flag
* @bat_priv: the bat priv with all the soft interface information
*
* Return: an orig_node which has the BATADV_MCAST_WANT_NO_RTR4 flag unset and
* increases its refcount.
*/
static struct batadv_orig_node *
batadv_mcast_forw_rtr4_node_get(struct batadv_priv *bat_priv)
{
struct batadv_orig_node *tmp_orig_node, *orig_node = NULL;
rcu_read_lock();
hlist_for_each_entry_rcu(tmp_orig_node,
&bat_priv->mcast.want_all_rtr4_list,
mcast_want_all_rtr4_node) {
if (!kref_get_unless_zero(&tmp_orig_node->refcount))
continue;
orig_node = tmp_orig_node;
break;
}
rcu_read_unlock();
return orig_node;
}
/**
* batadv_mcast_forw_rtr6_node_get() - get a node with an ipv6 mcast router flag
* @bat_priv: the bat priv with all the soft interface information
*
* Return: an orig_node which has the BATADV_MCAST_WANT_NO_RTR6 flag unset
* and increases its refcount.
*/
static struct batadv_orig_node *
batadv_mcast_forw_rtr6_node_get(struct batadv_priv *bat_priv)
{
struct batadv_orig_node *tmp_orig_node, *orig_node = NULL;
rcu_read_lock();
hlist_for_each_entry_rcu(tmp_orig_node,
&bat_priv->mcast.want_all_rtr6_list,
mcast_want_all_rtr6_node) {
if (!kref_get_unless_zero(&tmp_orig_node->refcount))
continue;
orig_node = tmp_orig_node;
break;
}
rcu_read_unlock();
return orig_node;
}
/**
* batadv_mcast_forw_rtr_node_get() - get a node with an ipv4/ipv6 router flag
* @bat_priv: the bat priv with all the soft interface information
* @ethhdr: an ethernet header to determine the protocol family from
*
* Return: an orig_node which has no BATADV_MCAST_WANT_NO_RTR4 or
* BATADV_MCAST_WANT_NO_RTR6 flag, depending on the provided ethhdr, set and
* increases its refcount.
*/
static struct batadv_orig_node *
batadv_mcast_forw_rtr_node_get(struct batadv_priv *bat_priv,
struct ethhdr *ethhdr)
{
switch (ntohs(ethhdr->h_proto)) {
case ETH_P_IP:
return batadv_mcast_forw_rtr4_node_get(bat_priv);
case ETH_P_IPV6:
return batadv_mcast_forw_rtr6_node_get(bat_priv);
default:
/* we shouldn't be here... */
return NULL;
}
}
/**
* batadv_mcast_forw_mode() - check on how to forward a multicast packet
* @bat_priv: the bat priv with all the soft interface information
* @skb: The multicast packet to check
* @orig: an originator to be set to forward the skb to
*
* Return: the forwarding mode as enum batadv_forw_mode and in case of
* BATADV_FORW_SINGLE set the orig to the single originator the skb
* should be forwarded to.
*/
enum batadv_forw_mode
batadv_mcast_forw_mode(struct batadv_priv *bat_priv, struct sk_buff *skb,
struct batadv_orig_node **orig)
{
int ret, tt_count, ip_count, unsnoop_count, total_count;
bool is_unsnoopable = false;
unsigned int mcast_fanout;
struct ethhdr *ethhdr;
int is_routable = 0;
int rtr_count = 0;
ret = batadv_mcast_forw_mode_check(bat_priv, skb, &is_unsnoopable,
&is_routable);
if (ret == -ENOMEM)
return BATADV_FORW_NONE;
else if (ret < 0)
return BATADV_FORW_ALL;
ethhdr = eth_hdr(skb);
tt_count = batadv_tt_global_hash_count(bat_priv, ethhdr->h_dest,
BATADV_NO_FLAGS);
ip_count = batadv_mcast_forw_want_all_ip_count(bat_priv, ethhdr);
unsnoop_count = !is_unsnoopable ? 0 :
atomic_read(&bat_priv->mcast.num_want_all_unsnoopables);
rtr_count = batadv_mcast_forw_rtr_count(bat_priv, is_routable);
total_count = tt_count + ip_count + unsnoop_count + rtr_count;
switch (total_count) {
case 1:
if (tt_count)
*orig = batadv_mcast_forw_tt_node_get(bat_priv, ethhdr);
else if (ip_count)
*orig = batadv_mcast_forw_ip_node_get(bat_priv, ethhdr);
else if (unsnoop_count)
*orig = batadv_mcast_forw_unsnoop_node_get(bat_priv);
else if (rtr_count)
*orig = batadv_mcast_forw_rtr_node_get(bat_priv,
ethhdr);
if (*orig)
return BATADV_FORW_SINGLE;
fallthrough;
case 0:
return BATADV_FORW_NONE;
default:
mcast_fanout = atomic_read(&bat_priv->multicast_fanout);
if (!unsnoop_count && total_count <= mcast_fanout)
return BATADV_FORW_SOME;
}
return BATADV_FORW_ALL;
}
/**
* batadv_mcast_forw_tt() - forwards a packet to multicast listeners
* @bat_priv: the bat priv with all the soft interface information
* @skb: the multicast packet to transmit
* @vid: the vlan identifier
*
* Sends copies of a frame with multicast destination to any multicast
* listener registered in the translation table. A transmission is performed
* via a batman-adv unicast packet for each such destination node.
*
* Return: NET_XMIT_DROP on memory allocation failure, NET_XMIT_SUCCESS
* otherwise.
*/
static int
batadv_mcast_forw_tt(struct batadv_priv *bat_priv, struct sk_buff *skb,
unsigned short vid)
{
int ret = NET_XMIT_SUCCESS;
struct sk_buff *newskb;
struct batadv_tt_orig_list_entry *orig_entry;
struct batadv_tt_global_entry *tt_global;
const u8 *addr = eth_hdr(skb)->h_dest;
tt_global = batadv_tt_global_hash_find(bat_priv, addr, vid);
if (!tt_global)
goto out;
rcu_read_lock();
hlist_for_each_entry_rcu(orig_entry, &tt_global->orig_list, list) {
newskb = skb_copy(skb, GFP_ATOMIC);
if (!newskb) {
ret = NET_XMIT_DROP;
break;
}
batadv_send_skb_unicast(bat_priv, newskb, BATADV_UNICAST, 0,
orig_entry->orig_node, vid);
}
rcu_read_unlock();
batadv_tt_global_entry_put(tt_global);
out:
return ret;
}
/**
* batadv_mcast_forw_want_all_ipv4() - forward to nodes with want-all-ipv4
* @bat_priv: the bat priv with all the soft interface information
* @skb: the multicast packet to transmit
* @vid: the vlan identifier
*
* Sends copies of a frame with multicast destination to any node with a
* BATADV_MCAST_WANT_ALL_IPV4 flag set. A transmission is performed via a
* batman-adv unicast packet for each such destination node.
*
* Return: NET_XMIT_DROP on memory allocation failure, NET_XMIT_SUCCESS
* otherwise.
*/
static int
batadv_mcast_forw_want_all_ipv4(struct batadv_priv *bat_priv,
struct sk_buff *skb, unsigned short vid)
{
struct batadv_orig_node *orig_node;
int ret = NET_XMIT_SUCCESS;
struct sk_buff *newskb;
rcu_read_lock();
hlist_for_each_entry_rcu(orig_node,
&bat_priv->mcast.want_all_ipv4_list,
mcast_want_all_ipv4_node) {
newskb = skb_copy(skb, GFP_ATOMIC);
if (!newskb) {
ret = NET_XMIT_DROP;
break;
}
batadv_send_skb_unicast(bat_priv, newskb, BATADV_UNICAST, 0,
orig_node, vid);
}
rcu_read_unlock();
return ret;
}
/**
* batadv_mcast_forw_want_all_ipv6() - forward to nodes with want-all-ipv6
* @bat_priv: the bat priv with all the soft interface information
* @skb: The multicast packet to transmit
* @vid: the vlan identifier
*
* Sends copies of a frame with multicast destination to any node with a
* BATADV_MCAST_WANT_ALL_IPV6 flag set. A transmission is performed via a
* batman-adv unicast packet for each such destination node.
*
* Return: NET_XMIT_DROP on memory allocation failure, NET_XMIT_SUCCESS
* otherwise.
*/
static int
batadv_mcast_forw_want_all_ipv6(struct batadv_priv *bat_priv,
struct sk_buff *skb, unsigned short vid)
{
struct batadv_orig_node *orig_node;
int ret = NET_XMIT_SUCCESS;
struct sk_buff *newskb;
rcu_read_lock();
hlist_for_each_entry_rcu(orig_node,
&bat_priv->mcast.want_all_ipv6_list,
mcast_want_all_ipv6_node) {
newskb = skb_copy(skb, GFP_ATOMIC);
if (!newskb) {
ret = NET_XMIT_DROP;
break;
}
batadv_send_skb_unicast(bat_priv, newskb, BATADV_UNICAST, 0,
orig_node, vid);
}
rcu_read_unlock();
return ret;
}
/**
* batadv_mcast_forw_want_all() - forward packet to nodes in a want-all list
* @bat_priv: the bat priv with all the soft interface information
* @skb: the multicast packet to transmit
* @vid: the vlan identifier
*
* Sends copies of a frame with multicast destination to any node with a
* BATADV_MCAST_WANT_ALL_IPV4 or BATADV_MCAST_WANT_ALL_IPV6 flag set. A
* transmission is performed via a batman-adv unicast packet for each such
* destination node.
*
* Return: NET_XMIT_DROP on memory allocation failure or if the protocol family
* is neither IPv4 nor IPv6. NET_XMIT_SUCCESS otherwise.
*/
static int
batadv_mcast_forw_want_all(struct batadv_priv *bat_priv,
struct sk_buff *skb, unsigned short vid)
{
switch (ntohs(eth_hdr(skb)->h_proto)) {
case ETH_P_IP:
return batadv_mcast_forw_want_all_ipv4(bat_priv, skb, vid);
case ETH_P_IPV6:
return batadv_mcast_forw_want_all_ipv6(bat_priv, skb, vid);
default:
/* we shouldn't be here... */
return NET_XMIT_DROP;
}
}
/**
* batadv_mcast_forw_want_all_rtr4() - forward to nodes with want-all-rtr4
* @bat_priv: the bat priv with all the soft interface information
* @skb: the multicast packet to transmit
* @vid: the vlan identifier
*
* Sends copies of a frame with multicast destination to any node with a
* BATADV_MCAST_WANT_NO_RTR4 flag unset. A transmission is performed via a
* batman-adv unicast packet for each such destination node.
*
* Return: NET_XMIT_DROP on memory allocation failure, NET_XMIT_SUCCESS
* otherwise.
*/
static int
batadv_mcast_forw_want_all_rtr4(struct batadv_priv *bat_priv,
struct sk_buff *skb, unsigned short vid)
{
struct batadv_orig_node *orig_node;
int ret = NET_XMIT_SUCCESS;
struct sk_buff *newskb;
rcu_read_lock();
hlist_for_each_entry_rcu(orig_node,
&bat_priv->mcast.want_all_rtr4_list,
mcast_want_all_rtr4_node) {
newskb = skb_copy(skb, GFP_ATOMIC);
if (!newskb) {
ret = NET_XMIT_DROP;
break;
}
batadv_send_skb_unicast(bat_priv, newskb, BATADV_UNICAST, 0,
orig_node, vid);
}
rcu_read_unlock();
return ret;
}
/**
* batadv_mcast_forw_want_all_rtr6() - forward to nodes with want-all-rtr6
* @bat_priv: the bat priv with all the soft interface information
* @skb: The multicast packet to transmit
* @vid: the vlan identifier
*
* Sends copies of a frame with multicast destination to any node with a
* BATADV_MCAST_WANT_NO_RTR6 flag unset. A transmission is performed via a
* batman-adv unicast packet for each such destination node.
*
* Return: NET_XMIT_DROP on memory allocation failure, NET_XMIT_SUCCESS
* otherwise.
*/
static int
batadv_mcast_forw_want_all_rtr6(struct batadv_priv *bat_priv,
struct sk_buff *skb, unsigned short vid)
{
struct batadv_orig_node *orig_node;
int ret = NET_XMIT_SUCCESS;
struct sk_buff *newskb;
rcu_read_lock();
hlist_for_each_entry_rcu(orig_node,
&bat_priv->mcast.want_all_rtr6_list,
mcast_want_all_rtr6_node) {
newskb = skb_copy(skb, GFP_ATOMIC);
if (!newskb) {
ret = NET_XMIT_DROP;
break;
}
batadv_send_skb_unicast(bat_priv, newskb, BATADV_UNICAST, 0,
orig_node, vid);
}
rcu_read_unlock();
return ret;
}
/**
* batadv_mcast_forw_want_rtr() - forward packet to nodes in a want-all-rtr list
* @bat_priv: the bat priv with all the soft interface information
* @skb: the multicast packet to transmit
* @vid: the vlan identifier
*
* Sends copies of a frame with multicast destination to any node with a
* BATADV_MCAST_WANT_NO_RTR4 or BATADV_MCAST_WANT_NO_RTR6 flag unset. A
* transmission is performed via a batman-adv unicast packet for each such
* destination node.
*
* Return: NET_XMIT_DROP on memory allocation failure or if the protocol family
* is neither IPv4 nor IPv6. NET_XMIT_SUCCESS otherwise.
*/
static int
batadv_mcast_forw_want_rtr(struct batadv_priv *bat_priv,
struct sk_buff *skb, unsigned short vid)
{
switch (ntohs(eth_hdr(skb)->h_proto)) {
case ETH_P_IP:
return batadv_mcast_forw_want_all_rtr4(bat_priv, skb, vid);
case ETH_P_IPV6:
return batadv_mcast_forw_want_all_rtr6(bat_priv, skb, vid);
default:
/* we shouldn't be here... */
return NET_XMIT_DROP;
}
}
/**
* batadv_mcast_forw_send() - send packet to any detected multicast recpient
* @bat_priv: the bat priv with all the soft interface information
* @skb: the multicast packet to transmit
* @vid: the vlan identifier
*
* Sends copies of a frame with multicast destination to any node that signaled
* interest in it, that is either via the translation table or the according
* want-all flags. A transmission is performed via a batman-adv unicast packet
* for each such destination node.
*
* The given skb is consumed/freed.
*
* Return: NET_XMIT_DROP on memory allocation failure or if the protocol family
* is neither IPv4 nor IPv6. NET_XMIT_SUCCESS otherwise.
*/
int batadv_mcast_forw_send(struct batadv_priv *bat_priv, struct sk_buff *skb,
unsigned short vid)
{
int ret;
ret = batadv_mcast_forw_tt(bat_priv, skb, vid);
if (ret != NET_XMIT_SUCCESS) {
kfree_skb(skb);
return ret;
}
ret = batadv_mcast_forw_want_all(bat_priv, skb, vid);
if (ret != NET_XMIT_SUCCESS) {
kfree_skb(skb);
return ret;
}
ret = batadv_mcast_forw_want_rtr(bat_priv, skb, vid);
if (ret != NET_XMIT_SUCCESS) {
kfree_skb(skb);
return ret;
}
consume_skb(skb);
return ret;
}
/**
* batadv_mcast_want_unsnoop_update() - update unsnoop counter and list
* @bat_priv: the bat priv with all the soft interface information
* @orig: the orig_node which multicast state might have changed of
* @mcast_flags: flags indicating the new multicast state
*
* If the BATADV_MCAST_WANT_ALL_UNSNOOPABLES flag of this originator,
* orig, has toggled then this method updates counter and list accordingly.
*
* Caller needs to hold orig->mcast_handler_lock.
*/
static void batadv_mcast_want_unsnoop_update(struct batadv_priv *bat_priv,
struct batadv_orig_node *orig,
u8 mcast_flags)
{
struct hlist_node *node = &orig->mcast_want_all_unsnoopables_node;
struct hlist_head *head = &bat_priv->mcast.want_all_unsnoopables_list;
lockdep_assert_held(&orig->mcast_handler_lock);
/* switched from flag unset to set */
if (mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES &&
!(orig->mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES)) {
atomic_inc(&bat_priv->mcast.num_want_all_unsnoopables);
spin_lock_bh(&bat_priv->mcast.want_lists_lock);
/* flag checks above + mcast_handler_lock prevents this */
WARN_ON(!hlist_unhashed(node));
hlist_add_head_rcu(node, head);
spin_unlock_bh(&bat_priv->mcast.want_lists_lock);
/* switched from flag set to unset */
} else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) &&
orig->mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) {
atomic_dec(&bat_priv->mcast.num_want_all_unsnoopables);
spin_lock_bh(&bat_priv->mcast.want_lists_lock);
/* flag checks above + mcast_handler_lock prevents this */
WARN_ON(hlist_unhashed(node));
hlist_del_init_rcu(node);
spin_unlock_bh(&bat_priv->mcast.want_lists_lock);
}
}
/**
* batadv_mcast_want_ipv4_update() - update want-all-ipv4 counter and list
* @bat_priv: the bat priv with all the soft interface information
* @orig: the orig_node which multicast state might have changed of
* @mcast_flags: flags indicating the new multicast state
*
* If the BATADV_MCAST_WANT_ALL_IPV4 flag of this originator, orig, has
* toggled then this method updates counter and list accordingly.
*
* Caller needs to hold orig->mcast_handler_lock.
*/
static void batadv_mcast_want_ipv4_update(struct batadv_priv *bat_priv,
struct batadv_orig_node *orig,
u8 mcast_flags)
{
struct hlist_node *node = &orig->mcast_want_all_ipv4_node;
struct hlist_head *head = &bat_priv->mcast.want_all_ipv4_list;
lockdep_assert_held(&orig->mcast_handler_lock);
/* switched from flag unset to set */
if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV4 &&
!(orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV4)) {
atomic_inc(&bat_priv->mcast.num_want_all_ipv4);
spin_lock_bh(&bat_priv->mcast.want_lists_lock);
/* flag checks above + mcast_handler_lock prevents this */
WARN_ON(!hlist_unhashed(node));
hlist_add_head_rcu(node, head);
spin_unlock_bh(&bat_priv->mcast.want_lists_lock);
/* switched from flag set to unset */
} else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_IPV4) &&
orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV4) {
atomic_dec(&bat_priv->mcast.num_want_all_ipv4);
spin_lock_bh(&bat_priv->mcast.want_lists_lock);
/* flag checks above + mcast_handler_lock prevents this */
WARN_ON(hlist_unhashed(node));
hlist_del_init_rcu(node);
spin_unlock_bh(&bat_priv->mcast.want_lists_lock);
}
}
/**
* batadv_mcast_want_ipv6_update() - update want-all-ipv6 counter and list
* @bat_priv: the bat priv with all the soft interface information
* @orig: the orig_node which multicast state might have changed of
* @mcast_flags: flags indicating the new multicast state
*
* If the BATADV_MCAST_WANT_ALL_IPV6 flag of this originator, orig, has
* toggled then this method updates counter and list accordingly.
*
* Caller needs to hold orig->mcast_handler_lock.
*/
static void batadv_mcast_want_ipv6_update(struct batadv_priv *bat_priv,
struct batadv_orig_node *orig,
u8 mcast_flags)
{
struct hlist_node *node = &orig->mcast_want_all_ipv6_node;
struct hlist_head *head = &bat_priv->mcast.want_all_ipv6_list;
lockdep_assert_held(&orig->mcast_handler_lock);
/* switched from flag unset to set */
if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV6 &&
!(orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV6)) {
atomic_inc(&bat_priv->mcast.num_want_all_ipv6);
spin_lock_bh(&bat_priv->mcast.want_lists_lock);
/* flag checks above + mcast_handler_lock prevents this */
WARN_ON(!hlist_unhashed(node));
hlist_add_head_rcu(node, head);
spin_unlock_bh(&bat_priv->mcast.want_lists_lock);
/* switched from flag set to unset */
} else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_IPV6) &&
orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV6) {
atomic_dec(&bat_priv->mcast.num_want_all_ipv6);
spin_lock_bh(&bat_priv->mcast.want_lists_lock);
/* flag checks above + mcast_handler_lock prevents this */
WARN_ON(hlist_unhashed(node));
hlist_del_init_rcu(node);
spin_unlock_bh(&bat_priv->mcast.want_lists_lock);
}
}
/**
* batadv_mcast_want_rtr4_update() - update want-all-rtr4 counter and list
* @bat_priv: the bat priv with all the soft interface information
* @orig: the orig_node which multicast state might have changed of
* @mcast_flags: flags indicating the new multicast state
*
* If the BATADV_MCAST_WANT_NO_RTR4 flag of this originator, orig, has
* toggled then this method updates counter and list accordingly.
*
* Caller needs to hold orig->mcast_handler_lock.
*/
static void batadv_mcast_want_rtr4_update(struct batadv_priv *bat_priv,
struct batadv_orig_node *orig,
u8 mcast_flags)
{
struct hlist_node *node = &orig->mcast_want_all_rtr4_node;
struct hlist_head *head = &bat_priv->mcast.want_all_rtr4_list;
lockdep_assert_held(&orig->mcast_handler_lock);
/* switched from flag set to unset */
if (!(mcast_flags & BATADV_MCAST_WANT_NO_RTR4) &&
orig->mcast_flags & BATADV_MCAST_WANT_NO_RTR4) {
atomic_inc(&bat_priv->mcast.num_want_all_rtr4);
spin_lock_bh(&bat_priv->mcast.want_lists_lock);
/* flag checks above + mcast_handler_lock prevents this */
WARN_ON(!hlist_unhashed(node));
hlist_add_head_rcu(node, head);
spin_unlock_bh(&bat_priv->mcast.want_lists_lock);
/* switched from flag unset to set */
} else if (mcast_flags & BATADV_MCAST_WANT_NO_RTR4 &&
!(orig->mcast_flags & BATADV_MCAST_WANT_NO_RTR4)) {
atomic_dec(&bat_priv->mcast.num_want_all_rtr4);
spin_lock_bh(&bat_priv->mcast.want_lists_lock);
/* flag checks above + mcast_handler_lock prevents this */
WARN_ON(hlist_unhashed(node));
hlist_del_init_rcu(node);
spin_unlock_bh(&bat_priv->mcast.want_lists_lock);
}
}
/**
* batadv_mcast_want_rtr6_update() - update want-all-rtr6 counter and list
* @bat_priv: the bat priv with all the soft interface information
* @orig: the orig_node which multicast state might have changed of
* @mcast_flags: flags indicating the new multicast state
*
* If the BATADV_MCAST_WANT_NO_RTR6 flag of this originator, orig, has
* toggled then this method updates counter and list accordingly.
*
* Caller needs to hold orig->mcast_handler_lock.
*/
static void batadv_mcast_want_rtr6_update(struct batadv_priv *bat_priv,
struct batadv_orig_node *orig,
u8 mcast_flags)
{
struct hlist_node *node = &orig->mcast_want_all_rtr6_node;
struct hlist_head *head = &bat_priv->mcast.want_all_rtr6_list;
lockdep_assert_held(&orig->mcast_handler_lock);
/* switched from flag set to unset */
if (!(mcast_flags & BATADV_MCAST_WANT_NO_RTR6) &&
orig->mcast_flags & BATADV_MCAST_WANT_NO_RTR6) {
atomic_inc(&bat_priv->mcast.num_want_all_rtr6);
spin_lock_bh(&bat_priv->mcast.want_lists_lock);
/* flag checks above + mcast_handler_lock prevents this */
WARN_ON(!hlist_unhashed(node));
hlist_add_head_rcu(node, head);
spin_unlock_bh(&bat_priv->mcast.want_lists_lock);
/* switched from flag unset to set */
} else if (mcast_flags & BATADV_MCAST_WANT_NO_RTR6 &&
!(orig->mcast_flags & BATADV_MCAST_WANT_NO_RTR6)) {
atomic_dec(&bat_priv->mcast.num_want_all_rtr6);
spin_lock_bh(&bat_priv->mcast.want_lists_lock);
/* flag checks above + mcast_handler_lock prevents this */
WARN_ON(hlist_unhashed(node));
hlist_del_init_rcu(node);
spin_unlock_bh(&bat_priv->mcast.want_lists_lock);
}
}
/**
* batadv_mcast_tvlv_flags_get() - get multicast flags from an OGM TVLV
* @enabled: whether the originator has multicast TVLV support enabled
* @tvlv_value: tvlv buffer containing the multicast flags
* @tvlv_value_len: tvlv buffer length
*
* Return: multicast flags for the given tvlv buffer
*/
static u8
batadv_mcast_tvlv_flags_get(bool enabled, void *tvlv_value, u16 tvlv_value_len)
{
u8 mcast_flags = BATADV_NO_FLAGS;
if (enabled && tvlv_value && tvlv_value_len >= sizeof(mcast_flags))
mcast_flags = *(u8 *)tvlv_value;
if (!enabled) {
mcast_flags |= BATADV_MCAST_WANT_ALL_IPV4;
mcast_flags |= BATADV_MCAST_WANT_ALL_IPV6;
}
/* remove redundant flags to avoid sending duplicate packets later */
if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV4)
mcast_flags |= BATADV_MCAST_WANT_NO_RTR4;
if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV6)
mcast_flags |= BATADV_MCAST_WANT_NO_RTR6;
return mcast_flags;
}
/**
* batadv_mcast_tvlv_ogm_handler() - process incoming multicast tvlv container
* @bat_priv: the bat priv with all the soft interface information
* @orig: the orig_node of the ogm
* @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags)
* @tvlv_value: tvlv buffer containing the multicast data
* @tvlv_value_len: tvlv buffer length
*/
static void batadv_mcast_tvlv_ogm_handler(struct batadv_priv *bat_priv,
struct batadv_orig_node *orig,
u8 flags,
void *tvlv_value,
u16 tvlv_value_len)
{
bool orig_mcast_enabled = !(flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND);
u8 mcast_flags;
mcast_flags = batadv_mcast_tvlv_flags_get(orig_mcast_enabled,
tvlv_value, tvlv_value_len);
spin_lock_bh(&orig->mcast_handler_lock);
if (orig_mcast_enabled &&
!test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities)) {
set_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities);
} else if (!orig_mcast_enabled &&
test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities)) {
clear_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities);
}
set_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capa_initialized);
batadv_mcast_want_unsnoop_update(bat_priv, orig, mcast_flags);
batadv_mcast_want_ipv4_update(bat_priv, orig, mcast_flags);
batadv_mcast_want_ipv6_update(bat_priv, orig, mcast_flags);
batadv_mcast_want_rtr4_update(bat_priv, orig, mcast_flags);
batadv_mcast_want_rtr6_update(bat_priv, orig, mcast_flags);
orig->mcast_flags = mcast_flags;
spin_unlock_bh(&orig->mcast_handler_lock);
}
/**
* batadv_mcast_init() - initialize the multicast optimizations structures
* @bat_priv: the bat priv with all the soft interface information
*/
void batadv_mcast_init(struct batadv_priv *bat_priv)
{
batadv_tvlv_handler_register(bat_priv, batadv_mcast_tvlv_ogm_handler,
NULL, BATADV_TVLV_MCAST, 2,
BATADV_TVLV_HANDLER_OGM_CIFNOTFND);
INIT_DELAYED_WORK(&bat_priv->mcast.work, batadv_mcast_mla_update);
batadv_mcast_start_timer(bat_priv);
}
#ifdef CONFIG_BATMAN_ADV_DEBUGFS
/**
* batadv_mcast_flags_print_header() - print own mcast flags to debugfs table
* @bat_priv: the bat priv with all the soft interface information
* @seq: debugfs table seq_file struct
*
* Prints our own multicast flags including a more specific reason why
* they are set, that is prints the bridge and querier state too, to
* the debugfs table specified via @seq.
*/
static void batadv_mcast_flags_print_header(struct batadv_priv *bat_priv,
struct seq_file *seq)
{
struct batadv_mcast_mla_flags *mla_flags = &bat_priv->mcast.mla_flags;
char querier4, querier6, shadowing4, shadowing6;
bool bridged = mla_flags->bridged;
u8 flags = mla_flags->tvlv_flags;
if (bridged) {
querier4 = mla_flags->querier_ipv4.exists ? '.' : '4';
querier6 = mla_flags->querier_ipv6.exists ? '.' : '6';
shadowing4 = mla_flags->querier_ipv4.shadowing ? '4' : '.';
shadowing6 = mla_flags->querier_ipv6.shadowing ? '6' : '.';
} else {
querier4 = '?';
querier6 = '?';
shadowing4 = '?';
shadowing6 = '?';
}
seq_printf(seq, "Multicast flags (own flags: [%c%c%c%s%s])\n",
(flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) ? 'U' : '.',
(flags & BATADV_MCAST_WANT_ALL_IPV4) ? '4' : '.',
(flags & BATADV_MCAST_WANT_ALL_IPV6) ? '6' : '.',
!(flags & BATADV_MCAST_WANT_NO_RTR4) ? "R4" : ". ",
!(flags & BATADV_MCAST_WANT_NO_RTR6) ? "R6" : ". ");
seq_printf(seq, "* Bridged [U]\t\t\t\t%c\n", bridged ? 'U' : '.');
seq_printf(seq, "* No IGMP/MLD Querier [4/6]:\t\t%c/%c\n",
querier4, querier6);
seq_printf(seq, "* Shadowing IGMP/MLD Querier [4/6]:\t%c/%c\n",
shadowing4, shadowing6);
seq_puts(seq, "-------------------------------------------\n");
seq_printf(seq, " %-10s %s\n", "Originator", "Flags");
}
/**
* batadv_mcast_flags_seq_print_text() - print the mcast flags of other nodes
* @seq: seq file to print on
* @offset: not used
*
* This prints a table of (primary) originators and their according
* multicast flags, including (in the header) our own.
*
* Return: always 0
*/
int batadv_mcast_flags_seq_print_text(struct seq_file *seq, void *offset)
{
struct net_device *net_dev = (struct net_device *)seq->private;
struct batadv_priv *bat_priv = netdev_priv(net_dev);
struct batadv_hard_iface *primary_if;
struct batadv_hashtable *hash = bat_priv->orig_hash;
struct batadv_orig_node *orig_node;
struct hlist_head *head;
u8 flags;
u32 i;
primary_if = batadv_seq_print_text_primary_if_get(seq);
if (!primary_if)
return 0;
batadv_mcast_flags_print_header(bat_priv, seq);
for (i = 0; i < hash->size; i++) {
head = &hash->table[i];
rcu_read_lock();
hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
if (!test_bit(BATADV_ORIG_CAPA_HAS_MCAST,
&orig_node->capa_initialized))
continue;
if (!test_bit(BATADV_ORIG_CAPA_HAS_MCAST,
&orig_node->capabilities)) {
seq_printf(seq, "%pM -\n", orig_node->orig);
continue;
}
flags = orig_node->mcast_flags;
seq_printf(seq, "%pM [%c%c%c%s%s]\n", orig_node->orig,
(flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES)
? 'U' : '.',
(flags & BATADV_MCAST_WANT_ALL_IPV4)
? '4' : '.',
(flags & BATADV_MCAST_WANT_ALL_IPV6)
? '6' : '.',
!(flags & BATADV_MCAST_WANT_NO_RTR4)
? "R4" : ". ",
!(flags & BATADV_MCAST_WANT_NO_RTR6)
? "R6" : ". ");
}
rcu_read_unlock();
}
batadv_hardif_put(primary_if);
return 0;
}
#endif
/**
* batadv_mcast_mesh_info_put() - put multicast info into a netlink message
* @msg: buffer for the message
* @bat_priv: the bat priv with all the soft interface information
*
* Return: 0 or error code.
*/
int batadv_mcast_mesh_info_put(struct sk_buff *msg,
struct batadv_priv *bat_priv)
{
u32 flags = bat_priv->mcast.mla_flags.tvlv_flags;
u32 flags_priv = BATADV_NO_FLAGS;
if (bat_priv->mcast.mla_flags.bridged) {
flags_priv |= BATADV_MCAST_FLAGS_BRIDGED;
if (bat_priv->mcast.mla_flags.querier_ipv4.exists)
flags_priv |= BATADV_MCAST_FLAGS_QUERIER_IPV4_EXISTS;
if (bat_priv->mcast.mla_flags.querier_ipv6.exists)
flags_priv |= BATADV_MCAST_FLAGS_QUERIER_IPV6_EXISTS;
if (bat_priv->mcast.mla_flags.querier_ipv4.shadowing)
flags_priv |= BATADV_MCAST_FLAGS_QUERIER_IPV4_SHADOWING;
if (bat_priv->mcast.mla_flags.querier_ipv6.shadowing)
flags_priv |= BATADV_MCAST_FLAGS_QUERIER_IPV6_SHADOWING;
}
if (nla_put_u32(msg, BATADV_ATTR_MCAST_FLAGS, flags) ||
nla_put_u32(msg, BATADV_ATTR_MCAST_FLAGS_PRIV, flags_priv))
return -EMSGSIZE;
return 0;
}
/**
* batadv_mcast_flags_dump_entry() - dump one entry of the multicast flags table
* to a netlink socket
* @msg: buffer for the message
* @portid: netlink port
* @cb: Control block containing additional options
* @orig_node: originator to dump the multicast flags of
*
* Return: 0 or error code.
*/
static int
batadv_mcast_flags_dump_entry(struct sk_buff *msg, u32 portid,
struct netlink_callback *cb,
struct batadv_orig_node *orig_node)
{
void *hdr;
hdr = genlmsg_put(msg, portid, cb->nlh->nlmsg_seq,
&batadv_netlink_family, NLM_F_MULTI,
BATADV_CMD_GET_MCAST_FLAGS);
if (!hdr)
return -ENOBUFS;
genl_dump_check_consistent(cb, hdr);
if (nla_put(msg, BATADV_ATTR_ORIG_ADDRESS, ETH_ALEN,
orig_node->orig)) {
genlmsg_cancel(msg, hdr);
return -EMSGSIZE;
}
if (test_bit(BATADV_ORIG_CAPA_HAS_MCAST,
&orig_node->capabilities)) {
if (nla_put_u32(msg, BATADV_ATTR_MCAST_FLAGS,
orig_node->mcast_flags)) {
genlmsg_cancel(msg, hdr);
return -EMSGSIZE;
}
}
genlmsg_end(msg, hdr);
return 0;
}
/**
* batadv_mcast_flags_dump_bucket() - dump one bucket of the multicast flags
* table to a netlink socket
* @msg: buffer for the message
* @portid: netlink port
* @cb: Control block containing additional options
* @hash: hash to dump
* @bucket: bucket index to dump
* @idx_skip: How many entries to skip
*
* Return: 0 or error code.
*/
static int
batadv_mcast_flags_dump_bucket(struct sk_buff *msg, u32 portid,
struct netlink_callback *cb,
struct batadv_hashtable *hash,
unsigned int bucket, long *idx_skip)
{
struct batadv_orig_node *orig_node;
long idx = 0;
spin_lock_bh(&hash->list_locks[bucket]);
cb->seq = atomic_read(&hash->generation) << 1 | 1;
hlist_for_each_entry(orig_node, &hash->table[bucket], hash_entry) {
if (!test_bit(BATADV_ORIG_CAPA_HAS_MCAST,
&orig_node->capa_initialized))
continue;
if (idx < *idx_skip)
goto skip;
if (batadv_mcast_flags_dump_entry(msg, portid, cb, orig_node)) {
spin_unlock_bh(&hash->list_locks[bucket]);
*idx_skip = idx;
return -EMSGSIZE;
}
skip:
idx++;
}
spin_unlock_bh(&hash->list_locks[bucket]);
return 0;
}
/**
* __batadv_mcast_flags_dump() - dump multicast flags table to a netlink socket
* @msg: buffer for the message
* @portid: netlink port
* @cb: Control block containing additional options
* @bat_priv: the bat priv with all the soft interface information
* @bucket: current bucket to dump
* @idx: index in current bucket to the next entry to dump
*
* Return: 0 or error code.
*/
static int
__batadv_mcast_flags_dump(struct sk_buff *msg, u32 portid,
struct netlink_callback *cb,
struct batadv_priv *bat_priv, long *bucket, long *idx)
{
struct batadv_hashtable *hash = bat_priv->orig_hash;
long bucket_tmp = *bucket;
long idx_tmp = *idx;
while (bucket_tmp < hash->size) {
if (batadv_mcast_flags_dump_bucket(msg, portid, cb, hash,
bucket_tmp, &idx_tmp))
break;
bucket_tmp++;
idx_tmp = 0;
}
*bucket = bucket_tmp;
*idx = idx_tmp;
return msg->len;
}
/**
* batadv_mcast_netlink_get_primary() - get primary interface from netlink
* callback
* @cb: netlink callback structure
* @primary_if: the primary interface pointer to return the result in
*
* Return: 0 or error code.
*/
static int
batadv_mcast_netlink_get_primary(struct netlink_callback *cb,
struct batadv_hard_iface **primary_if)
{
struct batadv_hard_iface *hard_iface = NULL;
struct net *net = sock_net(cb->skb->sk);
struct net_device *soft_iface;
struct batadv_priv *bat_priv;
int ifindex;
int ret = 0;
ifindex = batadv_netlink_get_ifindex(cb->nlh, BATADV_ATTR_MESH_IFINDEX);
if (!ifindex)
return -EINVAL;
soft_iface = dev_get_by_index(net, ifindex);
if (!soft_iface || !batadv_softif_is_valid(soft_iface)) {
ret = -ENODEV;
goto out;
}
bat_priv = netdev_priv(soft_iface);
hard_iface = batadv_primary_if_get_selected(bat_priv);
if (!hard_iface || hard_iface->if_status != BATADV_IF_ACTIVE) {
ret = -ENOENT;
goto out;
}
out:
if (soft_iface)
dev_put(soft_iface);
if (!ret && primary_if)
*primary_if = hard_iface;
else if (hard_iface)
batadv_hardif_put(hard_iface);
return ret;
}
/**
* batadv_mcast_flags_dump() - dump multicast flags table to a netlink socket
* @msg: buffer for the message
* @cb: callback structure containing arguments
*
* Return: message length.
*/
int batadv_mcast_flags_dump(struct sk_buff *msg, struct netlink_callback *cb)
{
struct batadv_hard_iface *primary_if = NULL;
int portid = NETLINK_CB(cb->skb).portid;
struct batadv_priv *bat_priv;
long *bucket = &cb->args[0];
long *idx = &cb->args[1];
int ret;
ret = batadv_mcast_netlink_get_primary(cb, &primary_if);
if (ret)
return ret;
bat_priv = netdev_priv(primary_if->soft_iface);
ret = __batadv_mcast_flags_dump(msg, portid, cb, bat_priv, bucket, idx);
batadv_hardif_put(primary_if);
return ret;
}
/**
* batadv_mcast_free() - free the multicast optimizations structures
* @bat_priv: the bat priv with all the soft interface information
*/
void batadv_mcast_free(struct batadv_priv *bat_priv)
{
cancel_delayed_work_sync(&bat_priv->mcast.work);
batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_MCAST, 2);
batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_MCAST, 2);
/* safely calling outside of worker, as worker was canceled above */
batadv_mcast_mla_tt_retract(bat_priv, NULL);
}
/**
* batadv_mcast_purge_orig() - reset originator global mcast state modifications
* @orig: the originator which is going to get purged
*/
void batadv_mcast_purge_orig(struct batadv_orig_node *orig)
{
struct batadv_priv *bat_priv = orig->bat_priv;
spin_lock_bh(&orig->mcast_handler_lock);
batadv_mcast_want_unsnoop_update(bat_priv, orig, BATADV_NO_FLAGS);
batadv_mcast_want_ipv4_update(bat_priv, orig, BATADV_NO_FLAGS);
batadv_mcast_want_ipv6_update(bat_priv, orig, BATADV_NO_FLAGS);
batadv_mcast_want_rtr4_update(bat_priv, orig,
BATADV_MCAST_WANT_NO_RTR4);
batadv_mcast_want_rtr6_update(bat_priv, orig,
BATADV_MCAST_WANT_NO_RTR6);
spin_unlock_bh(&orig->mcast_handler_lock);
}
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