From: Alexander Aring <aring@mojatatu.com>
Date: Thu, 18 Jan 2018 11:20:54 -0500
Subject: net: sched: cls: add extack support for tcf_change_indev
Patch-mainline: v4.16-rc1
Git-commit: 1057c55f6b6cdc4fa3e8e29cfb9061c211e58395
References: bsc#1109837

This patch adds extack handling for the tcf_change_indev function which
is common used by TC classifier implementations.

Cc: David Ahern <dsahern@gmail.com>
Signed-off-by: Alexander Aring <aring@mojatatu.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 include/net/pkt_cls.h  |    7 +++++--
 net/sched/cls_flower.c |    7 ++++---
 net/sched/cls_fw.c     |    2 +-
 net/sched/cls_u32.c    |    2 +-
 4 files changed, 11 insertions(+), 7 deletions(-)

--- a/include/net/pkt_cls.h
+++ b/include/net/pkt_cls.h
@@ -557,13 +557,16 @@ static inline int tcf_valid_offset(const
 #include <net/net_namespace.h>
 
 static inline int
-tcf_change_indev(struct net *net, struct nlattr *indev_tlv)
+tcf_change_indev(struct net *net, struct nlattr *indev_tlv,
+		 struct netlink_ext_ack *extack)
 {
 	char indev[IFNAMSIZ];
 	struct net_device *dev;
 
-	if (nla_strlcpy(indev, indev_tlv, IFNAMSIZ) >= IFNAMSIZ)
+	if (nla_strlcpy(indev, indev_tlv, IFNAMSIZ) >= IFNAMSIZ) {
+		NL_SET_ERR_MSG(extack, "Interface name too long");
 		return -EINVAL;
+	}
 	dev = __dev_get_by_name(net, indev);
 	if (!dev)
 		return -ENODEV;
--- a/net/sched/cls_flower.c
+++ b/net/sched/cls_flower.c
@@ -525,13 +525,14 @@ static void fl_set_key_ip(struct nlattr
 }
 
 static int fl_set_key(struct net *net, struct nlattr **tb,
-		      struct fl_flow_key *key, struct fl_flow_key *mask)
+		      struct fl_flow_key *key, struct fl_flow_key *mask,
+		      struct netlink_ext_ack *extack)
 {
 	__be16 ethertype;
 	int ret = 0;
 #ifdef CONFIG_NET_CLS_IND
 	if (tb[TCA_FLOWER_INDEV]) {
-		int err = tcf_change_indev(net, tb[TCA_FLOWER_INDEV]);
+		int err = tcf_change_indev(net, tb[TCA_FLOWER_INDEV], extack);
 		if (err < 0)
 			return err;
 		key->indev_ifindex = err;
@@ -840,7 +841,7 @@ static int fl_set_parms(struct net *net,
 		tcf_bind_filter(tp, &f->res, base);
 	}
 
-	err = fl_set_key(net, tb, &f->key, &mask->key);
+	err = fl_set_key(net, tb, &f->key, &mask->key, extack);
 	if (err)
 		return err;
 
--- a/net/sched/cls_fw.c
+++ b/net/sched/cls_fw.c
@@ -239,7 +239,7 @@ static int fw_set_parms(struct net *net,
 #ifdef CONFIG_NET_CLS_IND
 	if (tb[TCA_FW_INDEV]) {
 		int ret;
-		ret = tcf_change_indev(net, tb[TCA_FW_INDEV]);
+		ret = tcf_change_indev(net, tb[TCA_FW_INDEV], extack);
 		if (ret < 0)
 			return ret;
 		f->ifindex = ret;
--- a/net/sched/cls_u32.c
+++ b/net/sched/cls_u32.c
@@ -805,7 +805,7 @@ static int u32_set_parms(struct net *net
 #ifdef CONFIG_NET_CLS_IND
 	if (tb[TCA_U32_INDEV]) {
 		int ret;
-		ret = tcf_change_indev(net, tb[TCA_U32_INDEV]);
+		ret = tcf_change_indev(net, tb[TCA_U32_INDEV], extack);
 		if (ret < 0)
 			return -EINVAL;
 		n->ifindex = ret;