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

On branch : master

commit 77ec494490d60d89b42cd01d5dbf8dee04503623 Author: Linus Lüssing linus.luessing@web.de Date: Sat Feb 15 17:47:51 2014 +0100

batman-adv: Announce new capability via multicast TVLV

If the soft interface of a node is not part of a bridge then a node announces a new multicast TVLV: The existence of this TVLV signalizes that this node is announcing all of its multicast listeners via the translation table infrastructure.

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

77ec494490d60d89b42cd01d5dbf8dee04503623 main.c | 1 + multicast.c | 121 +++++++++++++++++++++++++++++++++++++++++++++++++++--- multicast.h | 14 +++++++ originator.c | 6 +++ packet.h | 12 ++++++ soft-interface.c | 4 ++ types.h | 13 ++++++ 7 files changed, 166 insertions(+), 5 deletions(-)

diff --git a/main.c b/main.c index 58e98c8..8f11b67 100644 --- a/main.c +++ b/main.c @@ -149,6 +149,7 @@ int batadv_mesh_init(struct net_device *soft_iface) goto err;

batadv_gw_init(bat_priv); + batadv_mcast_init(bat_priv);

atomic_set(&bat_priv->gw.reselect, 0); atomic_set(&bat_priv->mesh_state, BATADV_MESH_ACTIVE); diff --git a/multicast.c b/multicast.c index 66e270c..fe9e1e3 100644 --- a/multicast.c +++ b/multicast.c @@ -202,11 +202,52 @@ out: }

/** + * batadv_mcast_mla_tvlv_update - update multicast tvlv + * @bat_priv: the bat priv with all the soft interface information + * + * Update the own multicast tvlv with our current multicast related settings, + * capabilities and inabilities. + * + * Return true if the tvlv container is registered afterwards. Otherwise return + * false. + */ +static bool batadv_mcast_mla_tvlv_update(struct batadv_priv *bat_priv) +{ + struct batadv_tvlv_mcast_data mcast_data; + + mcast_data.flags = BATADV_NO_FLAGS; + memset(mcast_data.reserved, 0, sizeof(mcast_data.reserved)); + + /* 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)) { + if (bat_priv->mcast.enabled) { + batadv_tvlv_container_unregister(bat_priv, + BATADV_TVLV_MCAST, 1); + bat_priv->mcast.enabled = false; + } + + return false; + } + + if (!bat_priv->mcast.enabled || + mcast_data.flags != bat_priv->mcast.flags) { + batadv_tvlv_container_register(bat_priv, BATADV_TVLV_MCAST, 1, + &mcast_data, sizeof(mcast_data)); + bat_priv->mcast.flags = mcast_data.flags; + bat_priv->mcast.enabled = true; + } + + return true; +} + +/** * 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. + * table as well as the own, announced multicast tvlv container. */ void batadv_mcast_mla_update(struct batadv_priv *bat_priv) { @@ -214,10 +255,7 @@ void batadv_mcast_mla_update(struct batadv_priv *bat_priv) 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)) + if (!batadv_mcast_mla_tvlv_update(bat_priv)) goto update;

ret = batadv_mcast_mla_softif_get(soft_iface, &mcast_list); @@ -233,10 +271,83 @@ out: }

/** + * batadv_mcast_tvlv_ogm_handler_v1 - 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_v1(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig, + uint8_t flags, + void *tvlv_value, + uint16_t tvlv_value_len) +{ + bool orig_mcast_enabled = !(flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND); + uint8_t mcast_flags = BATADV_NO_FLAGS; + bool orig_initialized; + + orig_initialized = orig->capa_initialized & BATADV_ORIG_CAPA_HAS_MCAST; + + /* If mcast support is turned on decrease the disabled mcast node + * counter only if we had increased it for this node before. If this + * is a completely new orig_node no need to decrease the counter. + */ + if (orig_mcast_enabled && + !(orig->capabilities & BATADV_ORIG_CAPA_HAS_MCAST)) { + if (orig_initialized) + atomic_dec(&bat_priv->mcast.num_disabled); + orig->capabilities |= BATADV_ORIG_CAPA_HAS_MCAST; + /* If mcast support is being switched off increase the disabled + * mcast node counter. + */ + } else if (!orig_mcast_enabled && + orig->capabilities & BATADV_ORIG_CAPA_HAS_MCAST) { + atomic_inc(&bat_priv->mcast.num_disabled); + orig->capabilities &= ~BATADV_ORIG_CAPA_HAS_MCAST; + } + + orig->capa_initialized |= BATADV_ORIG_CAPA_HAS_MCAST; + + if (orig_mcast_enabled && tvlv_value && + (tvlv_value_len >= sizeof(mcast_flags))) + mcast_flags = *(uint8_t *)tvlv_value; + + orig->mcast_flags = mcast_flags; +} + +/** + * 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_v1, + NULL, BATADV_TVLV_MCAST, 1, + BATADV_TVLV_HANDLER_OGM_CIFNOTFND); +} + +/** * 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_tvlv_container_unregister(bat_priv, BATADV_TVLV_MCAST, 1); + batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_MCAST, 1); + 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; + + if (!(orig->capabilities & BATADV_ORIG_CAPA_HAS_MCAST)) + atomic_dec(&bat_priv->mcast.num_disabled); +} diff --git a/multicast.h b/multicast.h index 111aad7..d736335 100644 --- a/multicast.h +++ b/multicast.h @@ -19,8 +19,12 @@

void batadv_mcast_mla_update(struct batadv_priv *bat_priv);

+void batadv_mcast_init(struct batadv_priv *bat_priv); + void batadv_mcast_free(struct batadv_priv *bat_priv);

+void batadv_mcast_purge_orig(struct batadv_orig_node *orig_node); + #else

static inline void batadv_mcast_mla_update(struct batadv_priv *bat_priv) @@ -28,11 +32,21 @@ static inline void batadv_mcast_mla_update(struct batadv_priv *bat_priv) return; }

+static inline int batadv_mcast_init(struct batadv_priv *bat_priv) +{ + return 0; +} + static inline void batadv_mcast_free(struct batadv_priv *bat_priv) { return; }

+static inline void batadv_mcast_purge_orig(struct batadv_orig_node *orig_node) +{ + return; +} + #endif /* CONFIG_BATMAN_ADV_MCAST */

#endif /* _NET_BATMAN_ADV_MULTICAST_H_ */ diff --git a/originator.c b/originator.c index 24a9300..ffd9dfb 100644 --- a/originator.c +++ b/originator.c @@ -27,6 +27,7 @@ #include "bridge_loop_avoidance.h" #include "network-coding.h" #include "fragmentation.h" +#include "multicast.h"

/* hash class keys */ static struct lock_class_key batadv_orig_hash_lock_class_key; @@ -557,6 +558,8 @@ static void batadv_orig_node_free_rcu(struct rcu_head *rcu) } spin_unlock_bh(&orig_node->neigh_list_lock);

+ batadv_mcast_purge_orig(orig_node); + /* Free nc_nodes */ batadv_nc_purge_orig(orig_node->bat_priv, orig_node, NULL);

@@ -672,6 +675,9 @@ struct batadv_orig_node *batadv_orig_node_new(struct batadv_priv *bat_priv, orig_node->tt_buff_len = 0; reset_time = jiffies - 1 - msecs_to_jiffies(BATADV_RESET_PROTECTION_MS); orig_node->bcast_seqno_reset = reset_time; +#ifdef CONFIG_BATMAN_ADV_MCAST + orig_node->mcast_flags = BATADV_NO_FLAGS; +#endif

/* create a vlan object for the "untagged" LAN */ vlan = batadv_orig_node_vlan_new(orig_node, BATADV_NO_FLAGS); diff --git a/packet.h b/packet.h index 0a381d1..e8c483d 100644 --- a/packet.h +++ b/packet.h @@ -145,6 +145,7 @@ enum batadv_bla_claimframe { * @BATADV_TVLV_NC: network coding tvlv * @BATADV_TVLV_TT: translation table tvlv * @BATADV_TVLV_ROAM: roaming advertisement tvlv + * @BATADV_TVLV_MCAST: multicast capability tvlv */ enum batadv_tvlv_type { BATADV_TVLV_GW = 0x01, @@ -152,6 +153,7 @@ enum batadv_tvlv_type { BATADV_TVLV_NC = 0x03, BATADV_TVLV_TT = 0x04, BATADV_TVLV_ROAM = 0x05, + BATADV_TVLV_MCAST = 0x06, };

#pragma pack(2) @@ -504,4 +506,14 @@ struct batadv_tvlv_roam_adv { __be16 vid; };

+/** + * struct batadv_tvlv_mcast_data - payload of a multicast tvlv + * @flags: multicast flags announced by the orig node + * @reserved: reserved field + */ +struct batadv_tvlv_mcast_data { + uint8_t flags; + uint8_t reserved[3]; +}; + #endif /* _NET_BATMAN_ADV_PACKET_H_ */ diff --git a/soft-interface.c b/soft-interface.c index 633e9d6..8ff47b7 100644 --- a/soft-interface.c +++ b/soft-interface.c @@ -689,6 +689,10 @@ static int batadv_softif_init_late(struct net_device *dev) #ifdef CONFIG_BATMAN_ADV_DAT atomic_set(&bat_priv->distributed_arp_table, 1); #endif +#ifdef CONFIG_BATMAN_ADV_MCAST + bat_priv->mcast.flags = BATADV_NO_FLAGS; + atomic_set(&bat_priv->mcast.num_disabled, 0); +#endif atomic_set(&bat_priv->gw_mode, BATADV_GW_MODE_OFF); atomic_set(&bat_priv->gw_sel_class, 20); atomic_set(&bat_priv->gw.bandwidth_down, 100); diff --git a/types.h b/types.h index b46117c..96ee0d2 100644 --- a/types.h +++ b/types.h @@ -204,6 +204,7 @@ struct batadv_orig_bat_iv { * @batadv_dat_addr_t: address of the orig node in the distributed hash * @last_seen: time when last packet from this node was received * @bcast_seqno_reset: time when the broadcast seqno window was reset + * @mcast_flags: multicast flags announced by the orig node * @capabilities: announced capabilities of this originator * @capa_initialized: bitfield to remember whether a capability was initialized * @last_ttvn: last seen translation table version number @@ -246,6 +247,9 @@ struct batadv_orig_node { #endif unsigned long last_seen; unsigned long bcast_seqno_reset; +#ifdef CONFIG_BATMAN_ADV_MCAST + uint8_t mcast_flags; +#endif uint8_t capabilities; uint8_t capa_initialized; atomic_t last_ttvn; @@ -282,11 +286,14 @@ struct batadv_orig_node { * @BATADV_ORIG_CAPA_HAS_DAT: orig node has distributed arp table enabled * @BATADV_ORIG_CAPA_HAS_NC: orig node has network coding enabled * @BATADV_ORIG_CAPA_HAS_TT: orig node has tt capability + * @BATADV_ORIG_CAPA_HAS_MCAST: orig node has some multicast capability + * (= orig node announces a tvlv of type BATADV_TVLV_MCAST) */ enum batadv_orig_capabilities { BATADV_ORIG_CAPA_HAS_DAT = BIT(0), BATADV_ORIG_CAPA_HAS_NC = BIT(1), BATADV_ORIG_CAPA_HAS_TT = BIT(2), + BATADV_ORIG_CAPA_HAS_MCAST = BIT(3), };

/** @@ -612,9 +619,15 @@ struct batadv_priv_dat { /** * struct batadv_priv_mcast - per mesh interface mcast data * @mla_list: list of multicast addresses we are currently announcing via TT + * @flags: the flags we have last sent in our mcast tvlv + * @enabled: whether the multicast tvlv is currently enabled + * @num_disabled: number of nodes that have no mcast tvlv */ struct batadv_priv_mcast { struct hlist_head mla_list; + uint8_t flags; + bool enabled; + atomic_t num_disabled; }; #endif