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Message-ID: <20230112201554.752144-3-daniel.machon@microchip.com>
Date: Thu, 12 Jan 2023 21:15:50 +0100
From: Daniel Machon <daniel.machon@...rochip.com>
To: <netdev@...r.kernel.org>
CC: <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
<pabeni@...hat.com>, <lars.povlsen@...rochip.com>,
<Steen.Hegelund@...rochip.com>, <daniel.machon@...rochip.com>,
<UNGLinuxDriver@...rochip.com>, <joe@...ches.com>,
<error27@...il.com>, <horatiu.vultur@...rochip.com>,
<Julia.Lawall@...ia.fr>, <petrm@...dia.com>,
<vladimir.oltean@....com>, <maxime.chevallier@...tlin.com>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>
Subject: [PATCH net-next 2/6] net: dcb: add new common function for set/del of app/rewr entries
In preparation for DCB rewrite. Add a new function for setting and
deleting both app and rewrite entries. Moving this into a separate
function reduces duplicate code, as both type of entries requires the
same set of checks. The function will now iterate through a configurable
nested attribute (app or rewrite attr), validate each attribute and call
the appropriate set- or delete function.
Note that this function always checks for nla_len(attr_itr) <
sizeof(struct dcb_app), which was only done in dcbnl_ieee_set and not in
dcbnl_ieee_del prior to this patch. This means, that any userspace tool
that used to shove in data < sizeof(struct dcb_app) would now receive
-ERANGE.
Signed-off-by: Daniel Machon <daniel.machon@...rochip.com>
---
net/dcb/dcbnl.c | 104 +++++++++++++++++++++++-------------------------
1 file changed, 49 insertions(+), 55 deletions(-)
diff --git a/net/dcb/dcbnl.c b/net/dcb/dcbnl.c
index a76bdf6f0198..6d19564e19a8 100644
--- a/net/dcb/dcbnl.c
+++ b/net/dcb/dcbnl.c
@@ -1099,6 +1099,45 @@ static int dcbnl_getapptrust(struct net_device *netdev, struct sk_buff *skb)
return err;
}
+/* Set or delete APP table or rewrite table entries. The APP struct is validated
+ * and the appropriate callback function is called.
+ */
+static int dcbnl_apprewr_setdel(struct nlattr *attr, struct net_device *netdev,
+ int (*setdel)(struct net_device *dev,
+ struct dcb_app *app),
+ int (*ops_setdel)(struct net_device *dev,
+ struct dcb_app *app))
+{
+ struct dcb_app *app_data;
+ enum ieee_attrs_app type;
+ struct nlattr *attr_itr;
+ int rem, err;
+
+ nla_for_each_nested(attr_itr, attr, rem) {
+ type = nla_type(attr_itr);
+
+ if (!dcbnl_app_attr_type_validate(type))
+ continue;
+
+ if (nla_len(attr_itr) < sizeof(struct dcb_app))
+ return -ERANGE;
+
+ app_data = nla_data(attr_itr);
+
+ if (!dcbnl_app_selector_validate(type, app_data->selector))
+ return -EINVAL;
+
+ if (ops_setdel)
+ err = ops_setdel(netdev, app_data);
+ else
+ err = setdel(netdev, app_data);
+ if (err)
+ return err;
+ }
+
+ return 0;
+}
+
/* Handle IEEE 802.1Qaz/802.1Qau/802.1Qbb GET commands. */
static int dcbnl_ieee_fill(struct sk_buff *skb, struct net_device *netdev)
{
@@ -1568,36 +1607,11 @@ static int dcbnl_ieee_set(struct net_device *netdev, struct nlmsghdr *nlh,
}
if (ieee[DCB_ATTR_IEEE_APP_TABLE]) {
- struct nlattr *attr;
- int rem;
-
- nla_for_each_nested(attr, ieee[DCB_ATTR_IEEE_APP_TABLE], rem) {
- enum ieee_attrs_app type = nla_type(attr);
- struct dcb_app *app_data;
-
- if (!dcbnl_app_attr_type_validate(type))
- continue;
-
- if (nla_len(attr) < sizeof(struct dcb_app)) {
- err = -ERANGE;
- goto err;
- }
-
- app_data = nla_data(attr);
-
- if (!dcbnl_app_selector_validate(type,
- app_data->selector)) {
- err = -EINVAL;
- goto err;
- }
-
- if (ops->ieee_setapp)
- err = ops->ieee_setapp(netdev, app_data);
- else
- err = dcb_ieee_setapp(netdev, app_data);
- if (err)
- goto err;
- }
+ err = dcbnl_apprewr_setdel(ieee[DCB_ATTR_IEEE_APP_TABLE],
+ netdev, dcb_ieee_setapp,
+ ops->ieee_setapp);
+ if (err)
+ goto err;
}
if (ieee[DCB_ATTR_DCB_APP_TRUST_TABLE]) {
@@ -1684,31 +1698,11 @@ static int dcbnl_ieee_del(struct net_device *netdev, struct nlmsghdr *nlh,
return err;
if (ieee[DCB_ATTR_IEEE_APP_TABLE]) {
- struct nlattr *attr;
- int rem;
-
- nla_for_each_nested(attr, ieee[DCB_ATTR_IEEE_APP_TABLE], rem) {
- enum ieee_attrs_app type = nla_type(attr);
- struct dcb_app *app_data;
-
- if (!dcbnl_app_attr_type_validate(type))
- continue;
-
- app_data = nla_data(attr);
-
- if (!dcbnl_app_selector_validate(type,
- app_data->selector)) {
- err = -EINVAL;
- goto err;
- }
-
- if (ops->ieee_delapp)
- err = ops->ieee_delapp(netdev, app_data);
- else
- err = dcb_ieee_delapp(netdev, app_data);
- if (err)
- goto err;
- }
+ err = dcbnl_apprewr_setdel(ieee[DCB_ATTR_IEEE_APP_TABLE],
+ netdev, dcb_ieee_delapp,
+ ops->ieee_delapp);
+ if (err)
+ goto err;
}
err:
--
2.34.1
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