Repository : ssh://git@open-mesh.org/batman-adv

On branch : master

commit e368857f66620b8483166e8e6556d9c87f9b3e71 Author: Linus Lüssing linus.luessing@web.de Date: Sat Feb 15 17:47:49 2014 +0100

batman-adv: Multicast Listener Announcements via Translation Table

With this patch a node which has no bridge interface on top of its soft interface announces its local multicast listeners via the translation table.

Signed-off-by: Linus Lüssing linus.luessing@web.de Signed-off-by: Marek Lindner mareklindner@neomailbox.ch

e368857f66620b8483166e8e6556d9c87f9b3e71 Makefile | 2 + Makefile.kbuild | 1 + compat.h | 37 ++++++++ gen-compat-autoconf.sh | 1 + main.c | 6 ++ main.h | 1 + multicast.c | 242 ++++++++++++++++++++++++++++++++++++++++++++++++ multicast.h | 38 ++++++++ translation-table.c | 22 ++++- types.h | 24 +++++ 10 files changed, 370 insertions(+), 4 deletions(-)

diff --git a/Makefile b/Makefile index 9a7cbae..4f6c30a 100644 --- a/Makefile +++ b/Makefile @@ -25,6 +25,8 @@ export CONFIG_BATMAN_ADV_BLA=y export CONFIG_BATMAN_ADV_DAT=y # B.A.T.M.A.N network coding (catwoman): export CONFIG_BATMAN_ADV_NC=n +# B.A.T.M.A.N. multicast optimizations: +export CONFIG_BATMAN_ADV_MCAST=y

PWD:=$(shell pwd) KERNELPATH ?= /lib/modules/$(shell uname -r)/build diff --git a/Makefile.kbuild b/Makefile.kbuild index 42df18f..eb7d8c0 100644 --- a/Makefile.kbuild +++ b/Makefile.kbuild @@ -36,3 +36,4 @@ batman-adv-y += send.o batman-adv-y += soft-interface.o batman-adv-y += sysfs.o batman-adv-y += translation-table.o +batman-adv-$(CONFIG_BATMAN_ADV_MCAST) += multicast.o diff --git a/compat.h b/compat.h index 12bc8d8..7a3d235 100644 --- a/compat.h +++ b/compat.h @@ -103,6 +103,24 @@ static inline struct sk_buff *netdev_alloc_skb_ip_align(struct net_device *dev,

#define pr_warn pr_warning

+#undef netdev_for_each_mc_addr +#define netdev_for_each_mc_addr(mclist, dev) \ + for (mclist = (struct batadv_dev_addr_list *)dev->mc_list; mclist; \ + mclist = (struct batadv_dev_addr_list *)mclist->next) + +/* Note, that this breaks the usage of the normal 'struct netdev_hw_addr' + * for kernels < 2.6.35 in batman-adv! + */ +#define netdev_hw_addr batadv_dev_addr_list +struct batadv_dev_addr_list { + struct dev_addr_list *next; + u8 addr[MAX_ADDR_LEN]; + u8 da_addrlen; + u8 da_synced; + int da_users; + int da_gusers; +}; + #endif /* < KERNEL_VERSION(2, 6, 35) */

@@ -143,6 +161,14 @@ static inline int batadv_param_set_copystring(const char *val, #define addr_assign_type ifindex #define NET_ADDR_RANDOM 0

+#define netdev_master_upper_dev_get_rcu(dev) \ + NULL; \ + if (dev->br_port ? 1 : 0) { \ + rcu_read_unlock(); \ + dev_hold(dev); \ + return dev; \ + } + #endif /* < KERNEL_VERSION(2, 6, 36) */

#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 37) @@ -343,6 +369,17 @@ static int __batadv_interface_tx(struct sk_buff *skb, \ pos && ({ n = pos->member.next; 1; }); \ pos = hlist_entry_safe(n, typeof(*pos), member))

+#ifndef netdev_master_upper_dev_get_rcu +#define netdev_master_upper_dev_get_rcu(dev) \ + NULL; \ + if (dev->priv_flags & IFF_BRIDGE_PORT) { \ + rcu_read_unlock(); \ + dev_hold(dev); \ + return dev; \ + } + +#endif /* netdev_master_upper_dev_get_rcu */ + #endif /* < KERNEL_VERSION(3, 9, 0) */

#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 10, 0) diff --git a/gen-compat-autoconf.sh b/gen-compat-autoconf.sh index 78573e4..f625b6f 100755 --- a/gen-compat-autoconf.sh +++ b/gen-compat-autoconf.sh @@ -39,6 +39,7 @@ gen_config() { gen_config 'CONFIG_BATMAN_ADV_DEBUG' ${CONFIG_BATMAN_ADV_DEBUG:="n"} >> "${TMP}" gen_config 'CONFIG_BATMAN_ADV_BLA' ${CONFIG_BATMAN_ADV_BLA:="y"} >> "${TMP}" gen_config 'CONFIG_BATMAN_ADV_DAT' ${CONFIG_BATMAN_ADV_DAT:="y"} >> "${TMP}" +gen_config 'CONFIG_BATMAN_ADV_MCAST' ${CONFIG_BATMAN_ADV_MCAST:="y"} >> "${TMP}" gen_config 'CONFIG_BATMAN_ADV_NC' ${CONFIG_BATMAN_ADV_NC:="n"} >> "${TMP}"

# only regenerate compat-autoconf.h when config was changed diff --git a/main.c b/main.c index fbeaebd..58e98c8 100644 --- a/main.c +++ b/main.c @@ -34,6 +34,7 @@ #include "gateway_client.h" #include "bridge_loop_avoidance.h" #include "distributed-arp-table.h" +#include "multicast.h" #include "gateway_common.h" #include "hash.h" #include "bat_algo.h" @@ -120,6 +121,9 @@ int batadv_mesh_init(struct net_device *soft_iface) INIT_LIST_HEAD(&bat_priv->tt.changes_list); INIT_LIST_HEAD(&bat_priv->tt.req_list); INIT_LIST_HEAD(&bat_priv->tt.roam_list); +#ifdef CONFIG_BATMAN_ADV_MCAST + INIT_HLIST_HEAD(&bat_priv->mcast.mla_list); +#endif INIT_HLIST_HEAD(&bat_priv->tvlv.container_list); INIT_HLIST_HEAD(&bat_priv->tvlv.handler_list); INIT_HLIST_HEAD(&bat_priv->softif_vlan_list); @@ -169,6 +173,8 @@ void batadv_mesh_free(struct net_device *soft_iface) batadv_dat_free(bat_priv); batadv_bla_free(bat_priv);

+ batadv_mcast_free(bat_priv); + /* Free the TT and the originator tables only after having terminated * all the other depending components which may use these structures for * their purposes. diff --git a/main.h b/main.h index 34e85a2..dc6b4a2 100644 --- a/main.h +++ b/main.h @@ -176,6 +176,7 @@ enum batadv_uev_type { #include <linux/percpu.h> #include <linux/slab.h> #include <net/sock.h> /* struct sock */ +#include <net/addrconf.h> /* ipv6 address stuff */ #include <net/rtnetlink.h> #include <linux/jiffies.h> #include <linux/seq_file.h> diff --git a/multicast.c b/multicast.c new file mode 100644 index 0000000..66e270c --- /dev/null +++ b/multicast.c @@ -0,0 +1,242 @@ +/* Copyright (C) 2014 B.A.T.M.A.N. contributors: + * + * Linus Lüssing + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public + * License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + */ + +#include "main.h" +#include "multicast.h" +#include "originator.h" +#include "hard-interface.h" +#include "translation-table.h" + +/** + * 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 + * + * Collect multicast addresses of the local multicast listeners + * on 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_softif_get(struct net_device *dev, + struct hlist_head *mcast_list) +{ + struct netdev_hw_addr *mc_list_entry; + struct batadv_hw_addr *new; + int ret = 0; + + netif_addr_lock_bh(dev); + netdev_for_each_mc_addr(mc_list_entry, dev) { + new = kmalloc(sizeof(*new), GFP_ATOMIC); + if (!new) { + ret = -ENOMEM; + break; + } + + memcpy(&new->addr, &mc_list_entry->addr, ETH_ALEN); + hlist_add_head(&new->list, mcast_list); + ret++; + } + netif_addr_unlock_bh(dev); + + return ret; +} + +/** + * 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(uint8_t *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_list_free - free a list of multicast addresses + * @mcast_list: the list to free + * + * Remove and free 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 + * + * Retract 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 + * + * Add 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_get_bridge - get the bridge interface on our soft interface + * @bat_priv: the bat priv with all the soft interface information + * + * Return the next bridge interface on top of our soft interface and increase + * its refcount. If no such bridge interface exists, then return NULL. + */ +static struct net_device * +batadv_mcast_get_bridge(struct batadv_priv *bat_priv) +{ + struct net_device *upper = bat_priv->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_has_bridge - check whether the soft-iface is bridged + * @bat_priv: the bat priv with all the soft interface information + * + * Check whether there is a bridge on top of our soft interface. Return + * true if so, false otherwise. + */ +static bool batadv_mcast_has_bridge(struct batadv_priv *bat_priv) +{ + struct net_device *bridge; + + bridge = batadv_mcast_get_bridge(bat_priv); + if (!bridge) + goto out; + + dev_put(bridge); + return true; +out: + return false; +} + +/** + * batadv_mcast_mla_update - update the own MLAs + * @bat_priv: the bat priv with all the soft interface information + * + * Update the own multicast listener announcements in the translation + * table. + */ +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; + int ret; + + /* Avoid attaching MLAs, if there is a bridge on top of our soft + * interface, we don't support that yet (TODO) + */ + if (batadv_mcast_has_bridge(bat_priv)) + goto update; + + ret = batadv_mcast_mla_softif_get(soft_iface, &mcast_list); + if (ret < 0) + goto out; + +update: + batadv_mcast_mla_tt_retract(bat_priv, &mcast_list); + batadv_mcast_mla_tt_add(bat_priv, &mcast_list); + +out: + batadv_mcast_mla_list_free(&mcast_list); +} + +/** + * 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) +{ + batadv_mcast_mla_tt_retract(bat_priv, NULL); +} diff --git a/multicast.h b/multicast.h new file mode 100644 index 0000000..111aad7 --- /dev/null +++ b/multicast.h @@ -0,0 +1,38 @@ +/* Copyright (C) 2014 B.A.T.M.A.N. contributors: + * + * Linus Lüssing + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public + * License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + */ + +#ifndef _NET_BATMAN_ADV_MULTICAST_H_ +#define _NET_BATMAN_ADV_MULTICAST_H_ + +#ifdef CONFIG_BATMAN_ADV_MCAST + +void batadv_mcast_mla_update(struct batadv_priv *bat_priv); + +void batadv_mcast_free(struct batadv_priv *bat_priv); + +#else + +static inline void batadv_mcast_mla_update(struct batadv_priv *bat_priv) +{ + return; +} + +static inline void batadv_mcast_free(struct batadv_priv *bat_priv) +{ + return; +} + +#endif /* CONFIG_BATMAN_ADV_MCAST */ + +#endif /* _NET_BATMAN_ADV_MULTICAST_H_ */ diff --git a/translation-table.c b/translation-table.c index 6d0da58..4082d05 100644 --- a/translation-table.c +++ b/translation-table.c @@ -24,6 +24,7 @@ #include "originator.h" #include "routing.h" #include "bridge_loop_avoidance.h" +#include "multicast.h"

#include <linux/crc32c.h>

@@ -484,7 +485,7 @@ bool batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr, { struct batadv_priv *bat_priv = netdev_priv(soft_iface); struct batadv_tt_local_entry *tt_local; - struct batadv_tt_global_entry *tt_global; + struct batadv_tt_global_entry *tt_global = NULL; struct net_device *in_dev = NULL; struct hlist_head *head; struct batadv_tt_orig_list_entry *orig_entry; @@ -497,7 +498,9 @@ bool batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr, in_dev = dev_get_by_index(&init_net, ifindex);

tt_local = batadv_tt_local_hash_find(bat_priv, addr, vid); - tt_global = batadv_tt_global_hash_find(bat_priv, addr, vid); + + if (!is_multicast_ether_addr(addr)) + tt_global = batadv_tt_global_hash_find(bat_priv, addr, vid);

if (tt_local) { tt_local->last_seen = jiffies; @@ -562,8 +565,11 @@ bool batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr, tt_local->last_seen = jiffies; tt_local->common.added_at = tt_local->last_seen;

- /* the batman interface mac address should never be purged */ - if (batadv_compare_eth(addr, soft_iface->dev_addr)) + /* the batman interface mac and multicast addresses should never be + * purged + */ + if (batadv_compare_eth(addr, soft_iface->dev_addr) || + is_multicast_ether_addr(addr)) tt_local->common.flags |= BATADV_TT_CLIENT_NOPURGE;

hash_added = batadv_hash_add(bat_priv->tt.local_hash, batadv_compare_tt, @@ -1361,6 +1367,11 @@ add_orig_entry: ret = true;

out_remove: + /* Do not remove multicast addresses from the local hash on + * global additions + */ + if (is_multicast_ether_addr(tt_addr)) + goto out;

/* remove address from local hash if present */ local_flags = batadv_tt_local_remove(bat_priv, tt_addr, vid, @@ -3120,6 +3131,9 @@ static void batadv_tt_local_purge_pending_clients(struct batadv_priv *bat_priv) */ static void batadv_tt_local_commit_changes_nolock(struct batadv_priv *bat_priv) { + /* Update multicast addresses in local translation table */ + batadv_mcast_mla_update(bat_priv); + if (atomic_read(&bat_priv->tt.local_changes) < 1) { if (!batadv_atomic_dec_not_zero(&bat_priv->tt.ogm_append_cnt)) batadv_tt_tvlv_container_update(bat_priv); diff --git a/types.h b/types.h index 9f52517..d553264 100644 --- a/types.h +++ b/types.h @@ -607,6 +607,16 @@ struct batadv_priv_dat { }; #endif

+#ifdef CONFIG_BATMAN_ADV_MCAST +/** + * struct batadv_priv_mcast - per mesh interface mcast data + * @mla_list: list of multicast addresses we are currently announcing via TT + */ +struct batadv_priv_mcast { + struct hlist_head mla_list; +}; +#endif + /** * struct batadv_priv_nc - per mesh interface network coding private data * @work: work queue callback item for cleanup @@ -702,6 +712,7 @@ struct batadv_softif_vlan { * @tt: translation table data * @tvlv: type-version-length-value data * @dat: distributed arp table data + * @mcast: multicast data * @network_coding: bool indicating whether network coding is enabled * @batadv_priv_nc: network coding data */ @@ -759,6 +770,9 @@ struct batadv_priv { #ifdef CONFIG_BATMAN_ADV_DAT struct batadv_priv_dat dat; #endif +#ifdef CONFIG_BATMAN_ADV_MCAST + struct batadv_priv_mcast mcast; +#endif #ifdef CONFIG_BATMAN_ADV_NC atomic_t network_coding; struct batadv_priv_nc nc; @@ -1116,6 +1130,16 @@ struct batadv_dat_entry { };

/** + * struct batadv_hw_addr - a list entry for a MAC address + * @list: list node for the linking of entries + * @addr: the MAC address of this list entry + */ +struct batadv_hw_addr { + struct hlist_node list; + unsigned char addr[ETH_ALEN]; +}; + +/** * struct batadv_dat_candidate - candidate destination for DAT operations * @type: the type of the selected candidate. It can one of the following: * - BATADV_DAT_CANDIDATE_NOT_FOUND