From: "Linus Lüssing" <linus.luessing@c0d3.blue>
To: b.a.t.m.a.n@lists.open-mesh.org
Cc: "Linus Lüssing" <linus.luessing@c0d3.blue>
Subject: [PATCH v2] batman-adv: add dynamic, bridged-in TT VID detection support
Date: Wed, 12 Jun 2024 23:39:44 +0200 [thread overview]
Message-ID: <20240612213944.4169-1-linus.luessing@c0d3.blue> (raw)
So far, if we wanted to bridge VLAN tagged frames into the mesh one would
need to manually create an according VLAN interface on top of bat0
first, to trigger batman-adv to create the according structures
for a VID.
With this change the VLAN from bridged-in clients is now automatically
detected and added to the translation table on the fly.
Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
---
v2: fix a typo, a missing "to" in the commit message
net/batman-adv/hard-interface.c | 2 +-
net/batman-adv/multicast.c | 8 +-
net/batman-adv/soft-interface.c | 121 ++++++++++++++++-------------
net/batman-adv/soft-interface.h | 6 +-
net/batman-adv/translation-table.c | 19 ++---
net/batman-adv/translation-table.h | 4 +-
6 files changed, 88 insertions(+), 72 deletions(-)
diff --git a/net/batman-adv/hard-interface.c b/net/batman-adv/hard-interface.c
index 96a412beab2d..f5826dd8752c 100644
--- a/net/batman-adv/hard-interface.c
+++ b/net/batman-adv/hard-interface.c
@@ -946,7 +946,7 @@ static int batadv_hard_if_event_softif(unsigned long event,
switch (event) {
case NETDEV_REGISTER:
bat_priv = netdev_priv(net_dev);
- batadv_softif_create_vlan(bat_priv, BATADV_NO_FLAGS);
+ batadv_softif_create_vlan_own(bat_priv, BATADV_NO_FLAGS);
break;
}
diff --git a/net/batman-adv/multicast.c b/net/batman-adv/multicast.c
index 38fab5e46ae2..61e765352e29 100644
--- a/net/batman-adv/multicast.c
+++ b/net/batman-adv/multicast.c
@@ -724,6 +724,7 @@ static void batadv_mcast_mla_tt_add(struct batadv_priv *bat_priv,
{
struct batadv_hw_addr *mcast_entry;
struct hlist_node *tmp;
+ int ret;
if (!mcast_list)
return;
@@ -733,9 +734,10 @@ static void batadv_mcast_mla_tt_add(struct batadv_priv *bat_priv,
&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))
+ ret = batadv_tt_local_add(bat_priv->soft_iface,
+ mcast_entry->addr, BATADV_NO_FLAGS,
+ BATADV_NULL_IFINDEX, BATADV_NO_MARK);
+ if (ret <= 0)
continue;
hlist_del(&mcast_entry->list);
diff --git a/net/batman-adv/soft-interface.c b/net/batman-adv/soft-interface.c
index 30ecbc2ef1fd..fb647798e5c8 100644
--- a/net/batman-adv/soft-interface.c
+++ b/net/batman-adv/soft-interface.c
@@ -141,6 +141,10 @@ static int batadv_interface_set_mac_addr(struct net_device *dev, void *p)
rcu_read_lock();
hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
+ /* we don't use this VID ourself, avoid adding us to it */
+ if (!batadv_is_my_client(bat_priv, old_addr, vlan->vid))
+ continue;
+
batadv_tt_local_remove(bat_priv, old_addr, vlan->vid,
"mac address changed", false);
batadv_tt_local_add(dev, addr->sa_data, vlan->vid,
@@ -549,13 +553,15 @@ struct batadv_softif_vlan *batadv_softif_vlan_get(struct batadv_priv *bat_priv,
}
/**
- * batadv_softif_create_vlan() - allocate the needed resources for a new vlan
+ * batadv_softif_create_vlan() - create a softif vlan struct
* @bat_priv: the bat priv with all the soft interface information
* @vid: the VLAN identifier
*
- * Return: 0 on success, a negative error otherwise.
+ * Return: a pointer to the newly allocated softif vlan struct on success, NULL
+ * otherwise.
*/
-int batadv_softif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid)
+static struct batadv_softif_vlan *
+batadv_softif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid)
{
struct batadv_softif_vlan *vlan;
@@ -563,15 +569,14 @@ int batadv_softif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid)
vlan = batadv_softif_vlan_get(bat_priv, vid);
if (vlan) {
- batadv_softif_vlan_put(vlan);
spin_unlock_bh(&bat_priv->softif_vlan_list_lock);
- return -EEXIST;
+ return vlan;
}
vlan = kzalloc(sizeof(*vlan), GFP_ATOMIC);
if (!vlan) {
spin_unlock_bh(&bat_priv->softif_vlan_list_lock);
- return -ENOMEM;
+ return NULL;
}
vlan->bat_priv = bat_priv;
@@ -584,34 +589,71 @@ int batadv_softif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid)
hlist_add_head_rcu(&vlan->list, &bat_priv->softif_vlan_list);
spin_unlock_bh(&bat_priv->softif_vlan_list_lock);
+ return vlan;
+}
+
+/**
+ * batadv_softif_vlan_get_or_create() - retrieve or create a softif vlan struct
+ * @bat_priv: the bat priv with all the soft interface information
+ * @vid: the VLAN identifier
+ *
+ * Return: the softif vlan struct if found or created or NULL otherwise.
+ */
+struct batadv_softif_vlan *
+batadv_softif_vlan_get_or_create(struct batadv_priv *bat_priv,
+ unsigned short vid)
+{
+ struct batadv_softif_vlan *vlan = batadv_softif_vlan_get(bat_priv, vid);
+
+ if (vlan)
+ return vlan;
+
+ return batadv_softif_create_vlan(bat_priv, vid);
+}
+
+/**
+ * batadv_softif_create_vlan_own() - add our own softif to the local TT
+ * @bat_priv: the bat priv with all the soft interface information
+ * @vid: the VLAN identifier
+ *
+ * Adds the MAC address of our own soft interface with the given VLAN ID as
+ * a permanent local TT entry.
+ *
+ * Return: 0 on success, a negative error otherwise.
+ */
+int batadv_softif_create_vlan_own(struct batadv_priv *bat_priv,
+ unsigned short vid)
+{
+ int ret;
+
/* add a new TT local entry. This one will be marked with the NOPURGE
* flag
*/
- batadv_tt_local_add(bat_priv->soft_iface,
- bat_priv->soft_iface->dev_addr, vid,
- BATADV_NULL_IFINDEX, BATADV_NO_MARK);
-
- /* don't return reference to new softif_vlan */
- batadv_softif_vlan_put(vlan);
+ ret = batadv_tt_local_add(bat_priv->soft_iface,
+ bat_priv->soft_iface->dev_addr, vid,
+ BATADV_NULL_IFINDEX, BATADV_NO_MARK);
+ if (ret < 0)
+ return ret;
return 0;
}
/**
- * batadv_softif_destroy_vlan() - remove and destroy a softif_vlan object
+ * batadv_softif_destroy_vlan_own() - remove our own softif from the local TT
* @bat_priv: the bat priv with all the soft interface information
- * @vlan: the object to remove
+ * @vid: the VLAN identifier
+ *
+ * Removes the MAC address of our own soft interface with the given VLAN ID from
+ * the local TT.
*/
-static void batadv_softif_destroy_vlan(struct batadv_priv *bat_priv,
- struct batadv_softif_vlan *vlan)
+static void batadv_softif_destroy_vlan_own(struct batadv_priv *bat_priv,
+ unsigned short vid)
{
/* explicitly remove the associated TT local entry because it is marked
* with the NOPURGE flag
*/
- batadv_tt_local_remove(bat_priv, bat_priv->soft_iface->dev_addr,
- vlan->vid, "vlan interface destroyed", false);
-
- batadv_softif_vlan_put(vlan);
+ batadv_tt_local_remove(bat_priv, bat_priv->soft_iface->dev_addr, vid,
+ "vlan interface destroyed", false);
}
/**
@@ -629,7 +671,6 @@ static int batadv_interface_add_vid(struct net_device *dev, __be16 proto,
unsigned short vid)
{
struct batadv_priv *bat_priv = netdev_priv(dev);
- struct batadv_softif_vlan *vlan;
/* only 802.1Q vlans are supported.
* batman-adv does not know how to handle other types
@@ -639,25 +680,7 @@ static int batadv_interface_add_vid(struct net_device *dev, __be16 proto,
vid |= BATADV_VLAN_HAS_TAG;
- /* if a new vlan is getting created and it already exists, it means that
- * it was not deleted yet. batadv_softif_vlan_get() increases the
- * refcount in order to revive the object.
- *
- * if it does not exist then create it.
- */
- vlan = batadv_softif_vlan_get(bat_priv, vid);
- if (!vlan)
- return batadv_softif_create_vlan(bat_priv, vid);
-
- /* add a new TT local entry. This one will be marked with the NOPURGE
- * flag. This must be added again, even if the vlan object already
- * exists, because the entry was deleted by kill_vid()
- */
- batadv_tt_local_add(bat_priv->soft_iface,
- bat_priv->soft_iface->dev_addr, vid,
- BATADV_NULL_IFINDEX, BATADV_NO_MARK);
-
- return 0;
+ return batadv_softif_create_vlan_own(bat_priv, vid);
}
/**
@@ -676,7 +699,6 @@ static int batadv_interface_kill_vid(struct net_device *dev, __be16 proto,
unsigned short vid)
{
struct batadv_priv *bat_priv = netdev_priv(dev);
- struct batadv_softif_vlan *vlan;
/* only 802.1Q vlans are supported. batman-adv does not know how to
* handle other types
@@ -684,15 +706,7 @@ static int batadv_interface_kill_vid(struct net_device *dev, __be16 proto,
if (proto != htons(ETH_P_8021Q))
return -EINVAL;
- vlan = batadv_softif_vlan_get(bat_priv, vid | BATADV_VLAN_HAS_TAG);
- if (!vlan)
- return -ENOENT;
-
- batadv_softif_destroy_vlan(bat_priv, vlan);
-
- /* finally free the vlan object */
- batadv_softif_vlan_put(vlan);
-
+ batadv_softif_destroy_vlan_own(bat_priv, vid | BATADV_VLAN_HAS_TAG);
return 0;
}
@@ -1099,7 +1113,6 @@ static void batadv_softif_destroy_netlink(struct net_device *soft_iface,
{
struct batadv_priv *bat_priv = netdev_priv(soft_iface);
struct batadv_hard_iface *hard_iface;
- struct batadv_softif_vlan *vlan;
list_for_each_entry(hard_iface, &batadv_hardif_list, list) {
if (hard_iface->soft_iface == soft_iface)
@@ -1107,11 +1120,7 @@ static void batadv_softif_destroy_netlink(struct net_device *soft_iface,
}
/* destroy the "untagged" VLAN */
- vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS);
- if (vlan) {
- batadv_softif_destroy_vlan(bat_priv, vlan);
- batadv_softif_vlan_put(vlan);
- }
+ batadv_softif_destroy_vlan_own(bat_priv, BATADV_NO_FLAGS);
unregister_netdevice_queue(soft_iface, head);
}
diff --git a/net/batman-adv/soft-interface.h b/net/batman-adv/soft-interface.h
index 9f2003f1a497..7050ccd304df 100644
--- a/net/batman-adv/soft-interface.h
+++ b/net/batman-adv/soft-interface.h
@@ -21,10 +21,14 @@ void batadv_interface_rx(struct net_device *soft_iface,
struct batadv_orig_node *orig_node);
bool batadv_softif_is_valid(const struct net_device *net_dev);
extern struct rtnl_link_ops batadv_link_ops;
-int batadv_softif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid);
+int batadv_softif_create_vlan_own(struct batadv_priv *bat_priv,
+ unsigned short vid);
void batadv_softif_vlan_release(struct kref *ref);
struct batadv_softif_vlan *batadv_softif_vlan_get(struct batadv_priv *bat_priv,
unsigned short vid);
+struct batadv_softif_vlan *
+batadv_softif_vlan_get_or_create(struct batadv_priv *bat_priv,
+ unsigned short vid);
/**
* batadv_softif_vlan_put() - decrease the vlan object refcounter and
diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c
index b21ff3c36b07..ca74a46c1d93 100644
--- a/net/batman-adv/translation-table.c
+++ b/net/batman-adv/translation-table.c
@@ -591,8 +591,8 @@ static void batadv_tt_global_free(struct batadv_priv *bat_priv,
*
* Return: true if the client was successfully added, false otherwise.
*/
-bool batadv_tt_local_add(struct net_device *soft_iface, const u8 *addr,
- unsigned short vid, int ifindex, u32 mark)
+int batadv_tt_local_add(struct net_device *soft_iface, const u8 *addr,
+ unsigned short vid, int ifindex, u32 mark)
{
struct batadv_priv *bat_priv = netdev_priv(soft_iface);
struct batadv_tt_local_entry *tt_local;
@@ -604,10 +604,10 @@ bool batadv_tt_local_add(struct net_device *soft_iface, const u8 *addr,
struct hlist_head *head;
struct batadv_tt_orig_list_entry *orig_entry;
int hash_added, table_size, packet_size_max;
- bool ret = false;
bool roamed_back = false;
u8 remote_flags;
u32 match_mark;
+ int ret = 0;
if (ifindex != BATADV_NULL_IFINDEX)
in_dev = dev_get_by_index(net, ifindex);
@@ -658,21 +658,22 @@ bool batadv_tt_local_add(struct net_device *soft_iface, const u8 *addr,
net_ratelimited_function(batadv_info, soft_iface,
"Local translation table size (%i) exceeds maximum packet size (%i); Ignoring new local tt entry: %pM\n",
table_size, packet_size_max, addr);
+ ret = -E2BIG;
goto out;
}
tt_local = kmem_cache_alloc(batadv_tl_cache, GFP_ATOMIC);
- if (!tt_local)
+ if (!tt_local) {
+ ret = -ENOMEM;
goto out;
+ }
/* increase the refcounter of the related vlan */
- vlan = batadv_softif_vlan_get(bat_priv, vid);
+ vlan = batadv_softif_vlan_get_or_create(bat_priv, vid);
if (!vlan) {
- net_ratelimited_function(batadv_info, soft_iface,
- "adding TT local entry %pM to non-existent VLAN %d\n",
- addr, batadv_print_vid(vid));
kmem_cache_free(batadv_tl_cache, tt_local);
tt_local = NULL;
+ ret = -ENOMEM;
goto out;
}
@@ -769,7 +770,7 @@ bool batadv_tt_local_add(struct net_device *soft_iface, const u8 *addr,
if (remote_flags ^ (tt_local->common.flags & BATADV_TT_REMOTE_MASK))
batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS);
- ret = true;
+ ret = 1;
out:
batadv_hardif_put(in_hardif);
dev_put(in_dev);
diff --git a/net/batman-adv/translation-table.h b/net/batman-adv/translation-table.h
index d18740d9a22b..bbdda8488c14 100644
--- a/net/batman-adv/translation-table.h
+++ b/net/batman-adv/translation-table.h
@@ -16,8 +16,8 @@
#include <linux/types.h>
int batadv_tt_init(struct batadv_priv *bat_priv);
-bool batadv_tt_local_add(struct net_device *soft_iface, const u8 *addr,
- unsigned short vid, int ifindex, u32 mark);
+int batadv_tt_local_add(struct net_device *soft_iface, const u8 *addr,
+ unsigned short vid, int ifindex, u32 mark);
u16 batadv_tt_local_remove(struct batadv_priv *bat_priv,
const u8 *addr, unsigned short vid,
const char *message, bool roaming);
--
2.45.1
next reply other threads:[~2024-06-12 21:40 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-06-12 21:39 Linus Lüssing [this message]
2024-06-16 20:38 ` [PATCH v2] batman-adv: add dynamic, bridged-in TT VID detection support Linus Lüssing
2024-07-12 22:13 ` Linus Lüssing
2024-11-14 13:48 ` Nicolas Escande
2024-11-14 13:58 ` Sven Eckelmann
2024-11-14 14:53 ` Nicolas Escande
2024-11-14 18:06 ` Linus Lüssing
2024-11-21 15:10 ` Nicolas Escande
2024-11-24 9:47 ` Sven Eckelmann
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