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authorChristoph Hellwig <hch@lst.de>2020-05-28 08:12:13 +0300
committerDavid S. Miller <davem@davemloft.net>2020-05-28 21:11:44 +0300
commit7594888c782e735f8a7b110094307a4dbe7b3f03 (patch)
tree70ec43dbef51bfe6b0b7799abbc866dcb11cbcca /net/core
parent76ee0785f42afbc0418072b7179d95f450d3c9a8 (diff)
downloadlinux-7594888c782e735f8a7b110094307a4dbe7b3f03.tar.xz
net: add sock_bindtoindex
Add a helper to directly set the SO_BINDTOIFINDEX sockopt from kernel space without going through a fake uaccess. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core')
-rw-r--r--net/core/sock.c21
1 files changed, 15 insertions, 6 deletions
diff --git a/net/core/sock.c b/net/core/sock.c
index d3b1d61e4f76..23f80880fbb2 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -566,7 +566,7 @@ struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
}
EXPORT_SYMBOL(sk_dst_check);
-static int sock_setbindtodevice_locked(struct sock *sk, int ifindex)
+static int sock_bindtoindex_locked(struct sock *sk, int ifindex)
{
int ret = -ENOPROTOOPT;
#ifdef CONFIG_NETDEVICES
@@ -594,6 +594,18 @@ out:
return ret;
}
+int sock_bindtoindex(struct sock *sk, int ifindex)
+{
+ int ret;
+
+ lock_sock(sk);
+ ret = sock_bindtoindex_locked(sk, ifindex);
+ release_sock(sk);
+
+ return ret;
+}
+EXPORT_SYMBOL(sock_bindtoindex);
+
static int sock_setbindtodevice(struct sock *sk, char __user *optval,
int optlen)
{
@@ -634,10 +646,7 @@ static int sock_setbindtodevice(struct sock *sk, char __user *optval,
goto out;
}
- lock_sock(sk);
- ret = sock_setbindtodevice_locked(sk, index);
- release_sock(sk);
-
+ return sock_bindtoindex(sk, index);
out:
#endif
@@ -1216,7 +1225,7 @@ set_rcvbuf:
break;
case SO_BINDTOIFINDEX:
- ret = sock_setbindtodevice_locked(sk, val);
+ ret = sock_bindtoindex_locked(sk, val);
break;
default: