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ipv4: fib: Hold rtnl_net_lock() in ip_rt_ioctl().

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ioctl(SIOCADDRT/SIOCDELRT) calls ip_rt_ioctl() to add/remove a route in
the netns of the specified socket.

Let's hold rtnl_net_lock() there.

Note that rtentry_to_fib_config() can be called without rtnl_net_lock()
if we convert rtentry.dev handling to RCU later.

Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Link: https://patch.msgid.link/20250228042328.96624-11-kuniyu@amazon.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Kuniyuki Iwashima
2025-02-27 20:23:26 -08:00
committed by Jakub Kicinski
parent af5cd2a8f0
commit c0ebe1cdc2
1 changed files with 4 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
net/ipv4/fib_frontend.c
View File

@@ -553,18 +553,16 @@ static int rtentry_to_fib_config(struct net *net, int cmd, struct rtentry *rt,
const struct in_ifaddr *ifa;
struct in_device *in_dev;
in_dev = __in_dev_get_rtnl(dev);
in_dev = __in_dev_get_rtnl_net(dev);
if (!in_dev)
return -ENODEV;
*colon = ':';
rcu_read_lock();
in_dev_for_each_ifa_rcu(ifa, in_dev) {
in_dev_for_each_ifa_rtnl_net(net, ifa, in_dev) {
if (strcmp(ifa->ifa_label, devname) == 0)
break;
}
rcu_read_unlock();
if (!ifa)
return -ENODEV;
@@ -635,7 +633,7 @@ int ip_rt_ioctl(struct net *net, unsigned int cmd, struct rtentry *rt)
if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
return -EPERM;
rtnl_lock();
rtnl_net_lock(net);
err = rtentry_to_fib_config(net, cmd, rt, &cfg);
if (err == 0) {
struct fib_table *tb;
@@ -659,7 +657,7 @@ int ip_rt_ioctl(struct net *net, unsigned int cmd, struct rtentry *rt)
/* allocated by rtentry_to_fib_config() */
kfree(cfg.fc_mx);
}
rtnl_unlock();
rtnl_net_unlock(net);
return err;
}
return -EINVAL;