With this patch a multicast packet is not always simply flooded anymore, the bevahiour for the following cases is changed to reduce unnecessary overhead:
If all nodes within the horizon of a certain node have signalized multicast listener announcement capability (BATADV_MCAST_LISTENER_ANNOUNCEMENT) then an IPv6 multicast packet with a destination of IPv6 link-local scope coming from the upstream of this node...
* ...is dropped if there is no according multicast listener in the translation table, * ...is forwarded via unicast if there is a single node with interested multicast listeners * ...and otherwise still gets flooded.
Signed-off-by: Linus Lüssing linus.luessing@web.de --- multicast.c | 60 +++++++++++++++++++++++++++++++++++ multicast.h | 23 ++++++++++++++ soft-interface.c | 18 +++++++++-- translation-table.c | 86 +++++++++++++++++++++++++++++++++++++++++---------- translation-table.h | 2 ++ types.h | 2 ++ 6 files changed, 173 insertions(+), 18 deletions(-)
diff --git a/multicast.c b/multicast.c index 4af4bc9..dee86ab 100644 --- a/net/batman-adv/multicast.c +++ b/net/batman-adv/multicast.c @@ -21,6 +21,7 @@ #include "originator.h" #include "hard-interface.h" #include "translation-table.h" +#include "multicast.h"
/** * batadv_mcast_mla_softif_get - get softif multicast listeners @@ -207,6 +208,61 @@ out: }
/** + * batadv_mcast_forw_mode - check on how to forward a multicast packet + * @skb: The multicast packet to check + * @bat_priv: the bat priv with all the soft interface information + * + * Return the forwarding mode as enum batadv_forw_mode. + */ +enum batadv_forw_mode +batadv_mcast_forw_mode(struct sk_buff *skb, struct batadv_priv *bat_priv) +{ + struct ethhdr *ethhdr = (struct ethhdr *)(skb->data); + struct ipv6hdr *ip6hdr; + int count; + + if (!atomic_read(&bat_priv->multicast_mode)) + return BATADV_FORW_ALL; + + if (atomic_read(&bat_priv->mcast.num_no_mla)) + return BATADV_FORW_ALL; + + if (ntohs(ethhdr->h_proto) != ETH_P_IPV6) + return BATADV_FORW_ALL; + + /* We might fail due to out-of-memory -> drop it */ + if (!pskb_may_pull(skb, sizeof(*ethhdr) + sizeof(*ip6hdr))) + return BATADV_FORW_NONE; + + ip6hdr = ipv6_hdr(skb); + + /* TODO: Implement Multicast Router Discovery, then add + * scope >= IPV6_ADDR_SCOPE_LINKLOCAL, too + */ + if (IPV6_ADDR_MC_SCOPE(&ip6hdr->daddr) != + IPV6_ADDR_SCOPE_LINKLOCAL) + return BATADV_FORW_ALL; + + /* We cannot snoop and therefore cannot optimize the + * all-nodes-multicast address + */ + if (ipv6_addr_is_ll_all_nodes(&ip6hdr->daddr)) + return BATADV_FORW_ALL; + + count = batadv_tt_global_hash_count(bat_priv, ethhdr->h_dest, + BATADV_NO_FLAGS); + + switch (count) { + case 0: + return BATADV_FORW_NONE; + case 1: + return BATADV_FORW_SINGLE; + default: + return BATADV_FORW_ALL; + } +} + +/** * 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 @@ -264,6 +320,10 @@ void batadv_mcast_free(struct batadv_priv *bat_priv) batadv_mcast_mla_tt_clean(bat_priv, NULL); }
+/** + * batadv_mcast_purge_orig - reset originator global mcast state modifications + * @orig_node: the originator which is going to get purged + */ void batadv_mcast_purge_orig(struct batadv_orig_node *orig_node) { if (!(orig_node->mcast_flags & BATADV_MCAST_LISTENER_ANNOUNCEMENT)) diff --git a/multicast.h b/multicast.h index d8bb869..c48bb8c 100644 --- a/net/batman-adv/multicast.h +++ b/net/batman-adv/multicast.h @@ -20,10 +20,27 @@ #ifndef _NET_BATMAN_ADV_MULTICAST_H_ #define _NET_BATMAN_ADV_MULTICAST_H_
+/** + * batadv_forw_mode - the way a packet should be forwarded as + * @BATADV_FORW_ALL: forward the packet to all nodes + * (currently via classic flooding) + * @BATADV_FORW_SINGLE: forward the packet to a single node + * (currently via the BATMAN_IV unicast routing protocol) + * @BATADV_FORW_NONE: don't forward, drop it + */ +enum batadv_forw_mode { + BATADV_FORW_ALL, + BATADV_FORW_SINGLE, + BATADV_FORW_NONE, +}; + #ifdef CONFIG_BATMAN_ADV_MCAST
void batadv_mcast_mla_tt_update(struct batadv_priv *bat_priv);
+enum batadv_forw_mode +batadv_mcast_forw_mode(struct sk_buff *skb, struct batadv_priv *bat_priv); + int batadv_mcast_init(struct batadv_priv *bat_priv);
void batadv_mcast_free(struct batadv_priv *bat_priv); @@ -37,6 +54,12 @@ static inline void batadv_mcast_mla_tt_update(struct batadv_priv *bat_priv) return; }
+static inline enum batadv_forw_mode +batadv_mcast_forw_mode(struct sk_buff *skb, struct batadv_priv *bat_priv) +{ + return BATADV_FORW_ALL; +} + static inline int batadv_mcast_init(struct batadv_priv *bat_priv) { return 0; diff --git a/soft-interface.c b/soft-interface.c index 1992c42..8fad00e 100644 --- a/net/batman-adv/soft-interface.c +++ b/net/batman-adv/soft-interface.c @@ -34,6 +34,7 @@ #include <linux/ethtool.h> #include <linux/etherdevice.h> #include <linux/if_vlan.h> +#include "multicast.h" #include "bridge_loop_avoidance.h" #include "network-coding.h"
@@ -169,6 +170,8 @@ static int batadv_interface_tx(struct sk_buff *skb, bool do_bcast = false; unsigned short vid; uint32_t seqno; + enum batadv_forw_mode mode; + bool forw_to_gw = false;
if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) goto dropped; @@ -226,13 +229,24 @@ static int batadv_interface_tx(struct sk_buff *skb, * via unicast to their gateway */ ret = batadv_gw_is_dhcp_target(skb, &header_len); - if (ret) + if (ret) { do_bcast = false; + forw_to_gw = true; + } break; case BATADV_GW_MODE_OFF: default: break; } + + if (do_bcast && !is_broadcast_ether_addr(ethhdr->h_dest)) { + mode = batadv_mcast_forw_mode(skb, bat_priv); + if (mode == BATADV_FORW_NONE) + goto dropped; + + if (mode == BATADV_FORW_SINGLE) + do_bcast = false; + } }
/* ethernet packet should be broadcasted */ @@ -289,7 +303,7 @@ static int batadv_interface_tx(struct sk_buff *skb,
batadv_dat_snoop_outgoing_arp_reply(bat_priv, skb);
- if (is_multicast_ether_addr(ethhdr->h_dest)) + if (forw_to_gw) ret = batadv_send_skb_via_gw(bat_priv, skb, vid); else ret = batadv_send_skb_via_tt(bat_priv, skb, vid); diff --git a/translation-table.c b/translation-table.c index 1a2fb69..fff0d45 100644 --- a/net/batman-adv/translation-table.c +++ b/net/batman-adv/translation-table.c @@ -195,6 +195,32 @@ batadv_tt_global_entry_free_ref(struct batadv_tt_global_entry *tt_global_entry) } }
+/** + * batadv_tt_global_hash_count - count the number of orig entries + * @hash: hash table containing the tt entries + * @addr: the mac address of the client to count entries for + * @vid: VLAN identifier + * + * Return the number of originators advertising the given address/data + * (excluding ourself). + */ +int batadv_tt_global_hash_count(struct batadv_priv *bat_priv, + const uint8_t *addr, unsigned short vid) +{ + struct batadv_tt_global_entry *tt_global_entry; + int count = 0; + + tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid); + if (!tt_global_entry) + goto out; + + count = atomic_read(&tt_global_entry->orig_list_count); + batadv_tt_global_entry_free_ref(tt_global_entry); + +out: + return count; +} + static void batadv_tt_orig_list_entry_free_rcu(struct rcu_head *rcu) { struct batadv_tt_orig_list_entry *orig_entry; @@ -875,6 +901,8 @@ batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry *tt_global, hlist_add_head_rcu(&orig_entry->list, &tt_global->orig_list); spin_unlock_bh(&tt_global->list_lock); + atomic_inc(&tt_global->orig_list_count); + out: if (orig_entry) batadv_tt_orig_list_entry_free_ref(orig_entry); @@ -944,6 +972,7 @@ static bool batadv_tt_global_add(struct batadv_priv *bat_priv, common->added_at = jiffies;
INIT_HLIST_HEAD(&tt_global_entry->orig_list); + atomic_set(&tt_global_entry->orig_list_count, 0); spin_lock_init(&tt_global_entry->list_lock);
hash_added = batadv_hash_add(bat_priv->tt.global_hash, @@ -1164,6 +1193,23 @@ out: return 0; }
+/** + * batadv_tt_global_del_orig_entry - remove and free an orig_entry + * @tt_global_entry: the global entry to remove the orig_entry from + * @orig_entry: the orig entry to remove and free + * + * Remove an orig_entry from its list in the given tt_global_entry and + * free this orig_entry afterwards. + */ +static void +batadv_tt_global_del_orig_entry(struct batadv_tt_global_entry *tt_global_entry, + struct batadv_tt_orig_list_entry *orig_entry) +{ + atomic_dec(&tt_global_entry->orig_list_count); + hlist_del_rcu(&orig_entry->list); + batadv_tt_orig_list_entry_free_ref(orig_entry); +} + /* deletes the orig list of a tt_global_entry */ static void batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry) @@ -1174,18 +1220,26 @@ batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry)
spin_lock_bh(&tt_global_entry->list_lock); head = &tt_global_entry->orig_list; - hlist_for_each_entry_safe(orig_entry, safe, head, list) { - hlist_del_rcu(&orig_entry->list); - batadv_tt_orig_list_entry_free_ref(orig_entry); - } + hlist_for_each_entry_safe(orig_entry, safe, head, list) + batadv_tt_global_del_orig_entry(tt_global_entry, orig_entry); spin_unlock_bh(&tt_global_entry->list_lock); }
+/** + * batadv_tt_global_del_orig_node - remove orig_node from a global tt entry + * @bat_priv: the bat priv with all the soft interface information + * @tt_global_entry: the global entry to remove the orig_node from + * @orig_node: the originator announcing the client + * @message: message to append to the log on deletion + * + * Remove the given orig_node and its according orig_entry from the given + * global tt entry. + */ static void -batadv_tt_global_del_orig_entry(struct batadv_priv *bat_priv, - struct batadv_tt_global_entry *tt_global_entry, - struct batadv_orig_node *orig_node, - const char *message) +batadv_tt_global_del_orig_node(struct batadv_priv *bat_priv, + struct batadv_tt_global_entry *tt_global_entry, + struct batadv_orig_node *orig_node, + const char *message) { struct hlist_head *head; struct hlist_node *safe; @@ -1202,8 +1256,8 @@ batadv_tt_global_del_orig_entry(struct batadv_priv *bat_priv, orig_node->orig, tt_global_entry->common.addr, BATADV_PRINT_VID(vid), message); - hlist_del_rcu(&orig_entry->list); - batadv_tt_orig_list_entry_free_ref(orig_entry); + batadv_tt_global_del_orig_entry(tt_global_entry, + orig_entry); } } spin_unlock_bh(&tt_global_entry->list_lock); @@ -1245,8 +1299,8 @@ batadv_tt_global_del_roaming(struct batadv_priv *bat_priv, /* there is another entry, we can simply delete this * one and can still use the other one. */ - batadv_tt_global_del_orig_entry(bat_priv, tt_global_entry, - orig_node, message); + batadv_tt_global_del_orig_node(bat_priv, tt_global_entry, + orig_node, message); }
/** @@ -1272,8 +1326,8 @@ static void batadv_tt_global_del(struct batadv_priv *bat_priv, goto out;
if (!roaming) { - batadv_tt_global_del_orig_entry(bat_priv, tt_global_entry, - orig_node, message); + batadv_tt_global_del_orig_node(bat_priv, tt_global_entry, + orig_node, message);
if (hlist_empty(&tt_global_entry->orig_list)) batadv_tt_global_free(bat_priv, tt_global_entry, @@ -1342,8 +1396,8 @@ void batadv_tt_global_del_orig(struct batadv_priv *bat_priv, struct batadv_tt_global_entry, common);
- batadv_tt_global_del_orig_entry(bat_priv, tt_global, - orig_node, message); + batadv_tt_global_del_orig_node(bat_priv, tt_global, + orig_node, message);
if (hlist_empty(&tt_global->orig_list)) { vid = tt_global->common.vid; diff --git a/translation-table.h b/translation-table.h index c6bf33c..396e7e1 100644 --- a/net/batman-adv/translation-table.h +++ b/net/batman-adv/translation-table.h @@ -31,6 +31,8 @@ int batadv_tt_global_seq_print_text(struct seq_file *seq, void *offset); void batadv_tt_global_del_orig(struct batadv_priv *bat_priv, struct batadv_orig_node *orig_node, const char *message); +int batadv_tt_global_hash_count(struct batadv_priv *bat_priv, + const uint8_t *addr, unsigned short vid); struct batadv_orig_node *batadv_transtable_search(struct batadv_priv *bat_priv, const uint8_t *src, const uint8_t *addr, diff --git a/types.h b/types.h index ceb96b0..7535c69 100644 --- a/net/batman-adv/types.h +++ b/net/batman-adv/types.h @@ -784,12 +784,14 @@ struct batadv_tt_local_entry { * struct batadv_tt_global_entry - translation table global entry data * @common: general translation table data * @orig_list: list of orig nodes announcing this non-mesh client + * @orig_list_count: number of items in the orig_list * @list_lock: lock protecting orig_list * @roam_at: time at which TT_GLOBAL_ROAM was set */ struct batadv_tt_global_entry { struct batadv_tt_common_entry common; struct hlist_head orig_list; + atomic_t orig_list_count; spinlock_t list_lock; /* protects orig_list */ unsigned long roam_at; };