[PATCH net-next v16 02/15] net/sched: act_api: increase action kind string length

[Jamal Hadi Salim <jhs@mojatatu.com>]

Increase action kind string length from IFNAMSIZ to 64

The new P4 actions, created via templates, will have longer names
of format: "pipeline_name/act_name". IFNAMSIZ is currently 16 and is most
of the times undersized for the above format.
So, to conform to this new format, we increase the maximum name length
and change its definition from IFNAMSIZ to ACTNAMSIZ to account for this
extra string (pipeline name) and the '/' character.

Co-developed-by: Victor Nogueira <victor@mojatatu.com>
Signed-off-by: Victor Nogueira <victor@mojatatu.com>
Co-developed-by: Pedro Tammela <pctammela@mojatatu.com>
Signed-off-by: Pedro Tammela <pctammela@mojatatu.com>
Signed-off-by: Jamal Hadi Salim <jhs@mojatatu.com>
Reviewed-by: Vlad Buslov <vladbu@nvidia.com>
Reviewed-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Acked-by: Toke Høiland-Jørgensen <toke@redhat.com>
---
 include/net/act_api.h        | 2 +-
 include/uapi/linux/pkt_cls.h | 1 +
 net/sched/act_api.c          | 8 ++++----
 3 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/include/net/act_api.h b/include/net/act_api.h
index f22be14bba64..c839ff57c1a8 100644
--- a/include/net/act_api.h
+++ b/include/net/act_api.h
@@ -106,7 +106,7 @@ typedef void (*tc_action_priv_destructor)(void *priv);
 struct tc_action_ops {
 	struct list_head head;
 	struct list_head p4_head;
-	char    kind[IFNAMSIZ];
+	char    kind[ACTNAMSIZ];
 	enum tca_id  id; /* identifier should match kind */
 	unsigned int	net_id;
 	size_t	size;
diff --git a/include/uapi/linux/pkt_cls.h b/include/uapi/linux/pkt_cls.h
index 229fc925ec3a..898f6a05ecf5 100644
--- a/include/uapi/linux/pkt_cls.h
+++ b/include/uapi/linux/pkt_cls.h
@@ -6,6 +6,7 @@
 #include <linux/pkt_sched.h>
 
 #define TC_COOKIE_MAX_SIZE 16
+#define ACTNAMSIZ 64
 
 /* Action attributes */
 enum {
diff --git a/net/sched/act_api.c b/net/sched/act_api.c
index be78df3345cf..87eb09121ca4 100644
--- a/net/sched/act_api.c
+++ b/net/sched/act_api.c
@@ -476,7 +476,7 @@ static size_t tcf_action_shared_attrs_size(const struct tc_action *act)
 	rcu_read_unlock();
 
 	return  nla_total_size(0) /* action number nested */
-		+ nla_total_size(IFNAMSIZ) /* TCA_ACT_KIND */
+		+ nla_total_size(ACTNAMSIZ) /* TCA_ACT_KIND */
 		+ cookie_len /* TCA_ACT_COOKIE */
 		+ nla_total_size(sizeof(struct nla_bitfield32)) /* TCA_ACT_HW_STATS */
 		+ nla_total_size(0) /* TCA_ACT_STATS nested */
@@ -1424,7 +1424,7 @@ tc_action_load_ops(struct net *net, struct nlattr *nla,
 	bool police = flags & TCA_ACT_FLAGS_POLICE;
 	struct nlattr *tb[TCA_ACT_MAX + 1];
 	struct tc_action_ops *a_o;
-	char act_name[IFNAMSIZ];
+	char act_name[ACTNAMSIZ];
 	struct nlattr *kind;
 	int err;
 
@@ -1439,12 +1439,12 @@ tc_action_load_ops(struct net *net, struct nlattr *nla,
 			NL_SET_ERR_MSG(extack, "TC action kind must be specified");
 			return ERR_PTR(err);
 		}
-		if (nla_strscpy(act_name, kind, IFNAMSIZ) < 0) {
+		if (nla_strscpy(act_name, kind, ACTNAMSIZ) < 0) {
 			NL_SET_ERR_MSG(extack, "TC action name too long");
 			return ERR_PTR(err);
 		}
 	} else {
-		if (strscpy(act_name, "police", IFNAMSIZ) < 0) {
+		if (strscpy(act_name, "police", ACTNAMSIZ) < 0) {
 			NL_SET_ERR_MSG(extack, "TC action name too long");
 			return ERR_PTR(-EINVAL);
 		}
-- 
2.34.1