[PATCH] batman-adv: Always send iface index+name in genlmsg

[PATCH] batman-adv: Always send iface index+name in genlmsg

[Sven Eckelmann]

The batman-adv netlink messages often contain the interface index and
interface name in the same message. This makes it easy for the receiver to
operate on the incoming data when it either needs to print something or
needs to operate on the interface index.

But one of the attributes was missing for:

* neighbor table dumps
* originator table dumps
* gateway list dumps
* query of hardif information
* query of vid information

The userspace therefore had to implement special workarounds using
SIOCGIFNAME or SIOCGIFINDEX depending on what was actually provided.
Providing both information simplifies the userspace code massively without
adding a lot of extra overhead in the kernel portion.

Signed-off-by: Sven Eckelmann <sven@narfation.org>
---
 net/batman-adv/bat_iv_ogm.c |  6 ++++++
 net/batman-adv/bat_v.c      | 10 ++++++++++
 net/batman-adv/netlink.c    |  8 ++++++++
 3 files changed, 24 insertions(+)

diff --git a/net/batman-adv/bat_iv_ogm.c b/net/batman-adv/bat_iv_ogm.c
index 789f257b..680def80 100644
--- a/net/batman-adv/bat_iv_ogm.c
+++ b/net/batman-adv/bat_iv_ogm.c
@@ -1849,6 +1849,8 @@ batadv_iv_ogm_orig_dump_subentry(struct sk_buff *msg, u32 portid, u32 seq,
 		    orig_node->orig) ||
 	    nla_put(msg, BATADV_ATTR_NEIGH_ADDRESS, ETH_ALEN,
 		    neigh_node->addr) ||
+	    nla_put_string(msg, BATADV_ATTR_HARD_IFNAME,
+			   neigh_node->if_incoming->net_dev->name) ||
 	    nla_put_u32(msg, BATADV_ATTR_HARD_IFINDEX,
 			neigh_node->if_incoming->net_dev->ifindex) ||
 	    nla_put_u8(msg, BATADV_ATTR_TQ, tq_avg) ||
@@ -2078,6 +2080,8 @@ batadv_iv_ogm_neigh_dump_neigh(struct sk_buff *msg, u32 portid, u32 seq,
 
 	if (nla_put(msg, BATADV_ATTR_NEIGH_ADDRESS, ETH_ALEN,
 		    hardif_neigh->addr) ||
+	    nla_put_string(msg, BATADV_ATTR_HARD_IFNAME,
+			   hardif_neigh->if_incoming->net_dev->name) ||
 	    nla_put_u32(msg, BATADV_ATTR_HARD_IFINDEX,
 			hardif_neigh->if_incoming->net_dev->ifindex) ||
 	    nla_put_u32(msg, BATADV_ATTR_LAST_SEEN_MSECS,
@@ -2459,6 +2463,8 @@ static int batadv_iv_gw_dump_entry(struct sk_buff *msg, u32 portid,
 		    router->addr) ||
 	    nla_put_string(msg, BATADV_ATTR_HARD_IFNAME,
 			   router->if_incoming->net_dev->name) ||
+	    nla_put_u32(msg, BATADV_ATTR_HARD_IFINDEX,
+			router->if_incoming->net_dev->ifindex) ||
 	    nla_put_u32(msg, BATADV_ATTR_BANDWIDTH_DOWN,
 			gw_node->bandwidth_down) ||
 	    nla_put_u32(msg, BATADV_ATTR_BANDWIDTH_UP,
diff --git a/net/batman-adv/bat_v.c b/net/batman-adv/bat_v.c
index e1ca2b8c..b98aea95 100644
--- a/net/batman-adv/bat_v.c
+++ b/net/batman-adv/bat_v.c
@@ -146,6 +146,8 @@ batadv_v_neigh_dump_neigh(struct sk_buff *msg, u32 portid, u32 seq,
 
 	if (nla_put(msg, BATADV_ATTR_NEIGH_ADDRESS, ETH_ALEN,
 		    hardif_neigh->addr) ||
+	    nla_put_string(msg, BATADV_ATTR_HARD_IFNAME,
+			   hardif_neigh->if_incoming->net_dev->name) ||
 	    nla_put_u32(msg, BATADV_ATTR_HARD_IFINDEX,
 			hardif_neigh->if_incoming->net_dev->ifindex) ||
 	    nla_put_u32(msg, BATADV_ATTR_LAST_SEEN_MSECS,
@@ -298,6 +300,8 @@ batadv_v_orig_dump_subentry(struct sk_buff *msg, u32 portid, u32 seq,
 	if (nla_put(msg, BATADV_ATTR_ORIG_ADDRESS, ETH_ALEN, orig_node->orig) ||
 	    nla_put(msg, BATADV_ATTR_NEIGH_ADDRESS, ETH_ALEN,
 		    neigh_node->addr) ||
+	    nla_put_string(msg, BATADV_ATTR_HARD_IFNAME,
+			   neigh_node->if_incoming->net_dev->name) ||
 	    nla_put_u32(msg, BATADV_ATTR_HARD_IFINDEX,
 			neigh_node->if_incoming->net_dev->ifindex) ||
 	    nla_put_u32(msg, BATADV_ATTR_THROUGHPUT, throughput) ||
@@ -739,6 +743,12 @@ static int batadv_v_gw_dump_entry(struct sk_buff *msg, u32 portid,
 		goto out;
 	}
 
+	if (nla_put_u32(msg, BATADV_ATTR_HARD_IFINDEX,
+			router->if_incoming->net_dev->ifindex)) {
+		genlmsg_cancel(msg, hdr);
+		goto out;
+	}
+
 	if (nla_put_u32(msg, BATADV_ATTR_BANDWIDTH_DOWN,
 			gw_node->bandwidth_down)) {
 		genlmsg_cancel(msg, hdr);
diff --git a/net/batman-adv/netlink.c b/net/batman-adv/netlink.c
index f317d206..b6cc746e 100644
--- a/net/batman-adv/netlink.c
+++ b/net/batman-adv/netlink.c
@@ -814,6 +814,10 @@ static int batadv_netlink_hardif_fill(struct sk_buff *msg,
 			bat_priv->soft_iface->ifindex))
 		goto nla_put_failure;
 
+	if (nla_put_string(msg, BATADV_ATTR_MESH_IFNAME,
+			   bat_priv->soft_iface->name))
+		goto nla_put_failure;
+
 	if (nla_put_u32(msg, BATADV_ATTR_HARD_IFINDEX,
 			net_dev->ifindex) ||
 	    nla_put_string(msg, BATADV_ATTR_HARD_IFNAME,
@@ -1045,6 +1049,10 @@ static int batadv_netlink_vlan_fill(struct sk_buff *msg,
 			bat_priv->soft_iface->ifindex))
 		goto nla_put_failure;
 
+	if (nla_put_string(msg, BATADV_ATTR_MESH_IFNAME,
+			   bat_priv->soft_iface->name))
+		goto nla_put_failure;
+
 	if (nla_put_u32(msg, BATADV_ATTR_VLANID, vlan->vid & VLAN_VID_MASK))
 		goto nla_put_failure;
 
-- 
2.30.2