[PATCHv3 net-next 6/7] net: sched: cls: add extack support for tcf_change_indev

[Alexander Aring]

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

Cc: David Ahern <dsah...@gmail.com>
Signed-off-by: Alexander Aring <ar...@mojatatu.com>
---
 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(-)

diff --git a/include/net/pkt_cls.h b/include/net/pkt_cls.h
index 6dd009e10e5d..2e4b8e436d25 100644
--- a/include/net/pkt_cls.h
+++ b/include/net/pkt_cls.h
@@ -557,13 +557,16 @@ static inline int tcf_valid_offset(const struct sk_buff 
*skb,
 #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;
diff --git a/net/sched/cls_flower.c b/net/sched/cls_flower.c
index 50145b873ff1..c6ac4a612c4a 100644
--- a/net/sched/cls_flower.c
+++ b/net/sched/cls_flower.c
@@ -526,13 +526,14 @@ static void fl_set_key_ip(struct nlattr **tb,
 }
 
 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;
@@ -841,7 +842,7 @@ static int fl_set_parms(struct net *net, struct tcf_proto 
*tp,
                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;
 
diff --git a/net/sched/cls_fw.c b/net/sched/cls_fw.c
index bd21ed83eb07..94d159a8869a 100644
--- a/net/sched/cls_fw.c
+++ b/net/sched/cls_fw.c
@@ -239,7 +239,7 @@ static int fw_set_parms(struct net *net, struct tcf_proto 
*tp,
 #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;
diff --git a/net/sched/cls_u32.c b/net/sched/cls_u32.c
index 7f772da8e627..e8963ed35899 100644
--- a/net/sched/cls_u32.c
+++ b/net/sched/cls_u32.c
@@ -804,7 +804,7 @@ static int u32_set_parms(struct net *net, struct tcf_proto 
*tp,
 #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;
-- 
2.11.0