netdev - [PATCH net-next 3/3] rtnetlink: Add more extack messages to rtnl

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20181106205116.7718-4-dsahern@kernel.org>
Date:   Tue,  6 Nov 2018 12:51:16 -0800
From:   David Ahern <dsahern@...nel.org>
To:     netdev@...r.kernel.org
Cc:     David Ahern <dsahern@...il.com>
Subject: [PATCH net-next 3/3] rtnetlink: Add more extack messages to rtnl_newlink

From: David Ahern <dsahern@...il.com>

Add extack arg to the nla_parse_nested calls in rtnl_newlink, and
add messages for unknown device type and link network namespace id.
In particular, it improves the failure message when the wrong link
type is used. From
    $ ip li add bond1 type bonding
    RTNETLINK answers: Operation not supported
to
    $ ip li add bond1 type bonding
    Error: Unknown device type.

(The module name is bonding but the link type is bond.)

Signed-off-by: David Ahern <dsahern@...il.com>
---
 net/core/rtnetlink.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index f787b7640d49..86f2d9cbdae3 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -3054,7 +3054,7 @@ static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
 			if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
 				err = nla_parse_nested(attr, ops->maxtype,
 						       linkinfo[IFLA_INFO_DATA],
-						       ops->policy, NULL);
+						       ops->policy, extack);
 				if (err < 0)
 					return err;
 				data = attr;
@@ -3076,7 +3076,7 @@ static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
 						       m_ops->slave_maxtype,
 						       linkinfo[IFLA_INFO_SLAVE_DATA],
 						       m_ops->slave_policy,
-						       NULL);
+						       extack);
 				if (err < 0)
 					return err;
 				slave_data = slave_attr;
@@ -3140,6 +3140,7 @@ static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
 					goto replay;
 			}
 #endif
+			NL_SET_ERR_MSG(extack, "Unknown device type");
 			return -EOPNOTSUPP;
 		}
 
@@ -3160,6 +3161,7 @@ static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
 
 			link_net = get_net_ns_by_id(dest_net, id);
 			if (!link_net) {
+				NL_SET_ERR_MSG(extack, "Unknown network namespace id");
 				err =  -EINVAL;
 				goto out;
 			}
-- 
2.11.0