[PATCH 26/28] ipv6: add ip6_sock_set_recvpktinfo

[Christoph Hellwig]

Add a helper to directly set the IPV6_RECVPKTINFO sockopt from kernel
space without going through a fake uaccess.

Signed-off-by: Christoph Hellwig <h...@lst.de>
---
 include/net/ipv6.h   |  7 +++++++
 net/sunrpc/svcsock.c | 10 ++--------
 2 files changed, 9 insertions(+), 8 deletions(-)

diff --git a/include/net/ipv6.h b/include/net/ipv6.h
index 9a90759830162..5e65bf2fd32d0 100644
--- a/include/net/ipv6.h
+++ b/include/net/ipv6.h
@@ -1262,4 +1262,11 @@ static inline int ip6_sock_set_addr_preferences(struct 
sock *sk, bool val)
        return ret;
 }
 
+static inline void ip6_sock_set_recvpktinfo(struct sock *sk)
+{
+       lock_sock(sk);
+       inet6_sk(sk)->rxopt.bits.rxinfo = true;
+       release_sock(sk);
+}
+
 #endif /* _NET_IPV6_H */
diff --git a/net/sunrpc/svcsock.c b/net/sunrpc/svcsock.c
index a391892977cd2..e7a0037d9b56c 100644
--- a/net/sunrpc/svcsock.c
+++ b/net/sunrpc/svcsock.c
@@ -595,8 +595,6 @@ static struct svc_xprt_class svc_udp_class = {
 
 static void svc_udp_init(struct svc_sock *svsk, struct svc_serv *serv)
 {
-       int err, level, optname, one = 1;
-
        svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_udp_class,
                      &svsk->sk_xprt, serv);
        clear_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags);
@@ -617,17 +615,13 @@ static void svc_udp_init(struct svc_sock *svsk, struct 
svc_serv *serv)
        switch (svsk->sk_sk->sk_family) {
        case AF_INET:
                ip_sock_set_pktinfo(svsk->sk_sock->sk);
-               return;
+               break;
        case AF_INET6:
-               level = SOL_IPV6;
-               optname = IPV6_RECVPKTINFO;
+               ip6_sock_set_recvpktinfo(svsk->sk_sock->sk);
                break;
        default:
                BUG();
        }
-       err = kernel_setsockopt(svsk->sk_sock, level, optname,
-                                       (char *)&one, sizeof(one));
-       dprintk("svc: kernel_setsockopt returned %d\n", err);
 }
 
 /*
-- 
2.26.2