netdev - [patch net-next 04/10] net: genetlink: parse attrs and store in contect info struct during dumpit

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Date:   Sat,  5 Oct 2019 20:04:36 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, jakub.kicinski@...ronome.com,
        alex.aring@...il.com, stefan@...enfreihafen.org,
        jon.maloy@...csson.com, ying.xue@...driver.com,
        johannes.berg@...el.com, mkubecek@...e.cz, yuehaibing@...wei.com,
        mlxsw@...lanox.com
Subject: [patch net-next 04/10] net: genetlink: parse attrs and store in contect info struct during dumpit

From: Jiri Pirko <jiri@...lanox.com>

Extend the dumpit info struct for attrs. Instead of existing attribute
validation do parse them and save in the info struct. Caller can benefit
from this and does not have to do parse itself. In order to properly
free attrs, genl_family pointer needs to be added to dumpit info struct
as well.

Signed-off-by: Jiri Pirko <jiri@...lanox.com>
---
 include/net/genetlink.h |  4 ++++
 net/netlink/genetlink.c | 39 ++++++++++++++++++++++-----------------
 2 files changed, 26 insertions(+), 17 deletions(-)

diff --git a/include/net/genetlink.h b/include/net/genetlink.h
index fb838f4b0089..922dcc9348b1 100644
--- a/include/net/genetlink.h
+++ b/include/net/genetlink.h
@@ -129,10 +129,14 @@ enum genl_validate_flags {
 
 /**
  * struct genl_info - info that is available during dumpit op call
+ * @family: generic netlink family - for internal genl code usage
  * @ops: generic netlink ops - for internal genl code usage
+ * @attrs: netlink attributes
  */
 struct genl_dumpit_info {
+	const struct genl_family *family;
 	const struct genl_ops *ops;
+	struct nlattr **attrs;
 };
 
 static inline const struct genl_dumpit_info *
diff --git a/net/netlink/genetlink.c b/net/netlink/genetlink.c
index a98c94594508..8059118ee5a1 100644
--- a/net/netlink/genetlink.c
+++ b/net/netlink/genetlink.c
@@ -542,6 +542,7 @@ static int genl_lock_done(struct netlink_callback *cb)
 		rc = ops->done(cb);
 		genl_unlock();
 	}
+	genl_family_rcv_msg_attrs_free(info->family, info->attrs);
 	genl_dumpit_info_free(info);
 	return rc;
 }
@@ -554,6 +555,7 @@ static int genl_parallel_done(struct netlink_callback *cb)
 
 	if (ops->done)
 		rc = ops->done(cb);
+	genl_family_rcv_msg_attrs_free(info->family, info->attrs);
 	genl_dumpit_info_free(info);
 	return rc;
 }
@@ -566,35 +568,38 @@ static int genl_family_rcv_msg_dumpit(const struct genl_family *family,
 				      int hdrlen, struct net *net)
 {
 	struct genl_dumpit_info *info;
+	struct nlattr **attrs = NULL;
 	int err;
 
 	if (!ops->dumpit)
 		return -EOPNOTSUPP;
 
-	if (!(ops->validate & GENL_DONT_VALIDATE_DUMP)) {
-		if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen))
-			return -EINVAL;
+	if (ops->validate & GENL_DONT_VALIDATE_DUMP)
+		goto no_attrs;
 
-		if (family->maxattr) {
-			unsigned int validate = NL_VALIDATE_STRICT;
-
-			if (ops->validate & GENL_DONT_VALIDATE_DUMP_STRICT)
-				validate = NL_VALIDATE_LIBERAL;
-			err = __nla_validate(nlmsg_attrdata(nlh, hdrlen),
-					     nlmsg_attrlen(nlh, hdrlen),
-					     family->maxattr, family->policy,
-					     validate, extack);
-			if (err)
-				return err;
-		}
-	}
+	if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen))
+		return -EINVAL;
+
+	if (!family->maxattr)
+		goto no_attrs;
 
+	attrs = genl_family_rcv_msg_attrs_parse(family, nlh, extack,
+						ops, hdrlen,
+						GENL_DONT_VALIDATE_DUMP_STRICT);
+	if (IS_ERR(attrs))
+		return PTR_ERR(attrs);
+
+no_attrs:
 	/* Allocate dumpit info. It is going to be freed by done() callback. */
 	info = genl_dumpit_info_alloc();
-	if (!info)
+	if (!info) {
+		genl_family_rcv_msg_attrs_free(family, attrs);
 		return -ENOMEM;
+	}
 
+	info->family = family;
 	info->ops = ops;
+	info->attrs = attrs;
 
 	if (!family->parallel_ops) {
 		struct netlink_dump_control c = {
-- 
2.21.0