linux-kernel - [PATCH 9/9] ipv6: use ->ndo_tunnel_ctl in addrconf_set

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Message-Id: <20200519130319.1464195-10-hch@lst.de>
Date:   Tue, 19 May 2020 15:03:19 +0200
From:   Christoph Hellwig <hch@....de>
To:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        Steffen Klassert <steffen.klassert@...unet.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 9/9] ipv6: use ->ndo_tunnel_ctl in addrconf_set_dstaddr

Use the new ->ndo_tunnel_ctl instead of overriding the address limit
and using ->ndo_do_ioctl just to do a pointless user copy.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 net/ipv6/addrconf.c | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index c827edf877414..09cfbf5dd7ce0 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -2787,8 +2787,6 @@ static int addrconf_set_sit_dstaddr(struct net *net, struct net_device *dev,
 		struct in6_ifreq *ireq)
 {
 	struct ip_tunnel_parm p = { };
-	mm_segment_t oldfs = get_fs();
-	struct ifreq ifr;
 	int err;
 
 	if (!(ipv6_addr_type(&ireq->ifr6_addr) & IPV6_ADDR_COMPATv4))
@@ -2799,13 +2797,10 @@ static int addrconf_set_sit_dstaddr(struct net *net, struct net_device *dev,
 	p.iph.ihl = 5;
 	p.iph.protocol = IPPROTO_IPV6;
 	p.iph.ttl = 64;
-	ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
 
-	if (!dev->netdev_ops->ndo_do_ioctl)
+	if (!dev->netdev_ops->ndo_tunnel_ctl)
 		return -EOPNOTSUPP;
-	set_fs(KERNEL_DS);
-	err = dev->netdev_ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
-	set_fs(oldfs);
+	err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, SIOCADDTUNNEL);
 	if (err)
 		return err;
 
-- 
2.26.2