Linux Ethernet Bridging - May 2022 - [Bridge] [PATCH net-next v6 2/2] net: vxlan: Add extack support to vxlan_fdb_delete

This patch adds extack msg support to vxlan_fdb_delete and vxlan_fdb_parse.
extack is used to propagate meaningful error msgs to the user of vxlan
fdb netlink api

Signed-off-by: Alaa Mohamed <eng.alaamohamedsoliman.am at gmail.com>
---
changes in V2:
        - fix spelling vxlan_fdb_delete
        - add missing braces
        - edit error message
---
changes in V3:
        fix errors reported by checkpatch.pl
---
changes in V4:
        - fix errors reported by checkpatch.pl
        - edit commit message.
---
changes in V5:
	- edit commit message
---
 drivers/net/vxlan/vxlan_core.c | 38 ++++++++++++++++++++++++----------
 1 file changed, 27 insertions(+), 11 deletions(-)

diff --git a/drivers/net/vxlan/vxlan_core.c b/drivers/net/vxlan/vxlan_core.c
index ad0f2150cfdb..429ce2168971 100644
--- a/drivers/net/vxlan/vxlan_core.c
+++ b/drivers/net/vxlan/vxlan_core.c
@@ -1129,19 +1129,25 @@ static void vxlan_fdb_dst_destroy(struct vxlan_dev
*vxlan, struct vxlan_fdb *f,

 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
 			   union vxlan_addr *ip, __be16 *port, __be32 *src_vni,
-			   __be32 *vni, u32 *ifindex, u32 *nhid)
+			   __be32 *vni, u32 *ifindex, u32 *nhid,
+			   struct netlink_ext_ack *extack)
 {
 	struct net *net = dev_net(vxlan->dev);
 	int err;

 	if (tb[NDA_NH_ID] && (tb[NDA_DST] || tb[NDA_VNI] || tb[NDA_IFINDEX] ||
-	    tb[NDA_PORT]))
-		return -EINVAL;
+	    tb[NDA_PORT])) {
+			NL_SET_ERR_MSG(extack,
+						  "DST, VNI, ifindex and port are mutually exclusive with
NH_ID");
+			return -EINVAL;
+		}

 	if (tb[NDA_DST]) {
 		err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
-		if (err)
+		if (err) {
+			NL_SET_ERR_MSG(extack, "Unsupported address family");
 			return err;
+		}
 	} else {
 		union vxlan_addr *remote = &vxlan->default_dst.remote_ip;

@@ -1157,24 +1163,30 @@ static int vxlan_fdb_parse(struct nlattr *tb[], struct
vxlan_dev *vxlan,
 	}

 	if (tb[NDA_PORT]) {
-		if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
+		if (nla_len(tb[NDA_PORT]) != sizeof(__be16)) {
+			NL_SET_ERR_MSG(extack, "Invalid vxlan port");
 			return -EINVAL;
+		}
 		*port = nla_get_be16(tb[NDA_PORT]);
 	} else {
 		*port = vxlan->cfg.dst_port;
 	}

 	if (tb[NDA_VNI]) {
-		if (nla_len(tb[NDA_VNI]) != sizeof(u32))
+		if (nla_len(tb[NDA_VNI]) != sizeof(u32)) {
+			NL_SET_ERR_MSG(extack, "Invalid vni");
 			return -EINVAL;
+		}
 		*vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
 	} else {
 		*vni = vxlan->default_dst.remote_vni;
 	}

 	if (tb[NDA_SRC_VNI]) {
-		if (nla_len(tb[NDA_SRC_VNI]) != sizeof(u32))
+		if (nla_len(tb[NDA_SRC_VNI]) != sizeof(u32)) {
+			NL_SET_ERR_MSG(extack, "Invalid src vni");
 			return -EINVAL;
+		}
 		*src_vni = cpu_to_be32(nla_get_u32(tb[NDA_SRC_VNI]));
 	} else {
 		*src_vni = vxlan->default_dst.remote_vni;
@@ -1183,12 +1195,16 @@ static int vxlan_fdb_parse(struct nlattr *tb[], struct
vxlan_dev *vxlan,
 	if (tb[NDA_IFINDEX]) {
 		struct net_device *tdev;

-		if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
+		if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32)) {
+			NL_SET_ERR_MSG(extack, "Invalid ifindex");
 			return -EINVAL;
+		}
 		*ifindex = nla_get_u32(tb[NDA_IFINDEX]);
 		tdev = __dev_get_by_index(net, *ifindex);
-		if (!tdev)
+		if (!tdev) {
+			NL_SET_ERR_MSG(extack, "Device not found");
 			return -EADDRNOTAVAIL;
+		}
 	} else {
 		*ifindex = 0;
 	}
@@ -1226,7 +1242,7 @@ static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr
*tb[],
 		return -EINVAL;

 	err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni,
&ifindex,
-			      &nhid);
+			      &nhid, extack);
 	if (err)
 		return err;

@@ -1292,7 +1308,7 @@ static int vxlan_fdb_delete(struct ndmsg *ndm, struct
nlattr *tb[],
 	int err;

 	err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni,
&ifindex,
-			      &nhid);
+			      &nhid, extack);
 	if (err)
 		return err;

--
2.36.0

On Thu,  5 May 2022 17:09:58 +0200 Alaa Mohamed wrote:
> +			NL_SET_ERR_MSG(extack,
> +						  "DST, VNI, ifindex and port are mutually exclusive with
NH_ID");
This continuation line still does not align with the opening bracket.
Look here if your email client makes it hard to see:

https://lore.kernel.org/all/ac4b6c650b6519cc56baa32ef20415460a5aa8ee.1651762830.git.eng.alaamohamedsoliman.am
at gmail.com/

Same story in patch 1:
>  static int ocelot_port_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
>  			       struct net_device *dev,
> -			       const unsigned char *addr, u16 vid)
> +			       const unsigned char *addr, u16 vid,
> +				   struct netlink_ext_ack *extack)
and here:
>  static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
>  			    struct net_device *dev,
> -			    const unsigned char *addr, u16 vid)
> +			    const unsigned char *addr, u16 vid,
> +				struct netlink_ext_ack *extack)