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ipv6: add ip6_sock_set_v6only 

Add a helper to directly set the IPV6_V6ONLY 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>
This commit is contained in:
Christoph Hellwig 2020-05-28 07:12:31 +02:00 committed by David S. Miller
parent c1f9ec5776
commit 9b115749ac
3 changed files with 13 additions and 9 deletions
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11
include/net/ipv6.h
View File

@ -1177,4 +1177,15 @@ int ipv6_sock_mc_join_ssm(struct sock *sk, int ifindex,
const struct in6_addr *addr, unsigned int mode);
int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
const struct in6_addr *addr);
static inline int ip6_sock_set_v6only(struct sock *sk)
{
if (inet_sk(sk)->inet_num)
return -EINVAL;
lock_sock(sk);
sk->sk_ipv6only = true;
release_sock(sk);
return 0;
}
#endif /* _NET_IPV6_H */

5
net/ipv6/ip6_udp_tunnel.c
View File

@ -25,10 +25,7 @@ int udp_sock_create6(struct net *net, struct udp_port_cfg *cfg,
goto error;
if (cfg->ipv6_v6only) {
int val = 1;
err = kernel_setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY,
(char *) &val, sizeof(val));
err = ip6_sock_set_v6only(sock->sk);
if (err < 0)
goto error;
}

6
net/sunrpc/svcsock.c
View File

@ -1328,7 +1328,6 @@ static struct svc_xprt *svc_create_socket(struct svc_serv *serv,
struct sockaddr *newsin = (struct sockaddr *)&addr;
int newlen;
int family;
int val;
RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
dprintk("svc: svc_create_socket(%s, %d, %s)\n",
@ -1364,11 +1363,8 @@ static struct svc_xprt *svc_create_socket(struct svc_serv *serv,
* getting requests from IPv4 remotes. Those should
* be shunted to a PF_INET listener via rpcbind.
*/
val = 1;
if (family == PF_INET6)
kernel_setsockopt(sock, SOL_IPV6, IPV6_V6ONLY,
(char *)&val, sizeof(val));
ip6_sock_set_v6only(sock->sk);
if (type == SOCK_STREAM)
sock->sk->sk_reuse = SK_CAN_REUSE; /* allow address reuse */
error = kernel_bind(sock, sin, len);