[PATCH 28/33] ipv6: add ip6_sock_set_recvpktinfo

Christoph Hellwig
2020-05-20T19:57:51Z

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

Signed-off-by: Christoph Hellwig <hch@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 80260cff7e0c0..79b68ee3820e7 100644
--- a/include/net/ipv6.h
+++ b/include/net/ipv6.h
@@ -1261,4 +1261,11 @@ 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