From: Michal Kubecek <mkubecek@suse.cz>
To: David Miller <davem@davemloft.net>, netdev@vger.kernel.org
Cc: Jakub Kicinski <jakub.kicinski@netronome.com>,
Jiri Pirko <jiri@resnulli.us>, Andrew Lunn <andrew@lunn.ch>,
Florian Fainelli <f.fainelli@gmail.com>,
John Linville <linville@tuxdriver.com>,
Stephen Hemminger <stephen@networkplumber.org>,
Johannes Berg <johannes@sipsolutions.net>,
linux-kernel@vger.kernel.org
Subject: [PATCH net-next v3 1/5] rtnetlink: provide permanent hardware address in RTM_NEWLINK
Date: Wed, 11 Dec 2019 10:58:14 +0100 (CET) [thread overview]
Message-ID: <f92869fa9d024e61eacd97cd8518d1d2cc7dc319.1576057593.git.mkubecek@suse.cz> (raw)
In-Reply-To: <cover.1576057593.git.mkubecek@suse.cz>
Permanent hardware address of a network device was traditionally provided
via ethtool ioctl interface but as Jiri Pirko pointed out in a review of
ethtool netlink interface, rtnetlink is much more suitable for it so let's
add it to the RTM_NEWLINK message.
Add IFLA_PERM_ADDRESS attribute to RTM_NEWLINK messages unless the
permanent address is all zeros (i.e. device driver did not fill it). As
permanent address is not modifiable, reject userspace requests containing
IFLA_PERM_ADDRESS attribute.
Note: we already provide permanent hardware address for bond slaves;
unfortunately we cannot drop that attribute for backward compatibility
reasons.
v5 -> v6: only add the attribute if permanent address is not zero
Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Acked-by: Stephen Hemminger <stephen@networkplumber.org>
---
include/uapi/linux/if_link.h | 1 +
net/core/rtnetlink.c | 5 +++++
2 files changed, 6 insertions(+)
diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
index 8aec8769d944..1d69f637c5d6 100644
--- a/include/uapi/linux/if_link.h
+++ b/include/uapi/linux/if_link.h
@@ -169,6 +169,7 @@ enum {
IFLA_MAX_MTU,
IFLA_PROP_LIST,
IFLA_ALT_IFNAME, /* Alternative ifname */
+ IFLA_PERM_ADDRESS,
__IFLA_MAX
};
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 02916f43bf63..20bc406f3871 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -1041,6 +1041,7 @@ static noinline size_t if_nlmsg_size(const struct net_device *dev,
+ nla_total_size(4) /* IFLA_MIN_MTU */
+ nla_total_size(4) /* IFLA_MAX_MTU */
+ rtnl_prop_list_size(dev)
+ + nla_total_size(MAX_ADDR_LEN) /* IFLA_PERM_ADDRESS */
+ 0;
}
@@ -1757,6 +1758,9 @@ static int rtnl_fill_ifinfo(struct sk_buff *skb,
nla_put_s32(skb, IFLA_NEW_IFINDEX, new_ifindex) < 0)
goto nla_put_failure;
+ if (memchr_inv(dev->perm_addr, '\0', dev->addr_len) &&
+ nla_put(skb, IFLA_PERM_ADDRESS, dev->addr_len, dev->perm_addr))
+ goto nla_put_failure;
rcu_read_lock();
if (rtnl_fill_link_af(skb, dev, ext_filter_mask))
@@ -1822,6 +1826,7 @@ static const struct nla_policy ifla_policy[IFLA_MAX+1] = {
[IFLA_PROP_LIST] = { .type = NLA_NESTED },
[IFLA_ALT_IFNAME] = { .type = NLA_STRING,
.len = ALTIFNAMSIZ - 1 },
+ [IFLA_PERM_ADDRESS] = { .type = NLA_REJECT },
};
static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
--
2.24.0
next prev parent reply other threads:[~2019-12-11 9:58 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-11 9:58 [PATCH net-next v3 0/5] ethtool netlink interface, preliminary part Michal Kubecek
2019-12-11 9:58 ` Michal Kubecek [this message]
2019-12-11 9:58 ` [PATCH net-next v3 2/5] netlink: rename nl80211_validate_nested() to nla_validate_nested() Michal Kubecek
2019-12-11 9:58 ` [PATCH net-next v3 3/5] ethtool: move to its own directory Michal Kubecek
2019-12-11 9:58 ` [PATCH net-next v3 4/5] ethtool: move string arrays into common file Michal Kubecek
2019-12-12 4:03 ` Florian Fainelli
2019-12-11 9:58 ` [PATCH net-next v3 5/5] ethtool: provide link mode names as a string set Michal Kubecek
2019-12-12 4:12 ` Florian Fainelli
2019-12-11 17:46 ` [PATCH net-next v3 0/5] ethtool netlink interface, preliminary part Jakub Kicinski
2019-12-12 4:13 ` Florian Fainelli
2019-12-13 1:07 ` David Miller
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