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ipv4: add ip_sock_set_freebind

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Add a helper to directly set the IP_FREEBIND 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 07:12:27 +02:00 committed by David S. Miller
parent 6ebf71bab9
commit c4e446bf5a
3 changed files with 12 additions and 10 deletions
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13
drivers/target/iscsi/iscsi_target_login.c
View File

@ -15,6 +15,7 @@
#include <linux/sched/signal.h>
#include <linux/idr.h>
#include <linux/tcp.h> /* TCP_NODELAY */
#include <net/ip.h>
#include <net/ipv6.h> /* ipv6_addr_v4mapped() */
#include <scsi/iscsi_proto.h>
#include <target/target_core_base.h>
@ -855,7 +856,7 @@ int iscsit_setup_np(
struct sockaddr_storage *sockaddr)
{
struct socket *sock = NULL;
int backlog = ISCSIT_TCP_BACKLOG, ret, opt = 0, len;
int backlog = ISCSIT_TCP_BACKLOG, ret, len;
switch (np->np_network_transport) {
case ISCSI_TCP:
@ -900,15 +901,7 @@ int iscsit_setup_np(
if (np->np_network_transport == ISCSI_TCP)
tcp_sock_set_nodelay(sock->sk);
sock_set_reuseaddr(sock->sk);
opt = 1;
ret = kernel_setsockopt(sock, IPPROTO_IP, IP_FREEBIND,
(char *)&opt, sizeof(opt));
if (ret < 0) {
pr_err("kernel_setsockopt() for IP_FREEBIND"
" failed\n");
goto fail;
}
ip_sock_set_freebind(sock->sk);
ret = kernel_bind(sock, (struct sockaddr *)&np->np_sockaddr, len);
if (ret < 0) {

1
include/net/ip.h
View File

@ -765,6 +765,7 @@ static inline bool inetdev_valid_mtu(unsigned int mtu)
return likely(mtu >= IPV4_MIN_MTU);
}
void ip_sock_set_freebind(struct sock *sk);
void ip_sock_set_tos(struct sock *sk, int val);
#endif /* _IP_H */

8
net/ipv4/ip_sockglue.c
View File

@ -581,6 +581,14 @@ void ip_sock_set_tos(struct sock *sk, int val)
}
EXPORT_SYMBOL(ip_sock_set_tos);
void ip_sock_set_freebind(struct sock *sk)
{
lock_sock(sk);
inet_sk(sk)->freebind = true;
release_sock(sk);
}
EXPORT_SYMBOL(ip_sock_set_freebind);
/*
* Socket option code for IP. This is the end of the line after any
* TCP,UDP etc options on an IP socket.