[PATCH 21/33] ipv4: add ip_sock_set_freebind
From: Christoph Hellwig <hch@lst.de>
Date: 2020-05-20 19:58:48
Also in:
ceph-devel, linux-cifs, linux-nfs, linux-nvme, linux-rdma, linux-sctp, lkml, ocfs2-devel, target-devel
Subsystem:
networking [general], networking [ipv4/ipv6], scsi target subsystem, the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, David Ahern, Ido Schimmel, "Martin K. Petersen", Linus Torvalds
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> --- drivers/target/iscsi/iscsi_target_login.c | 13 +++---------- include/net/ip.h | 1 + net/ipv4/ip_sockglue.c | 8 ++++++++ 3 files changed, 12 insertions(+), 10 deletions(-)
diff --git a/drivers/target/iscsi/iscsi_target_login.c b/drivers/target/iscsi/iscsi_target_login.c
index b561b07a869a0..85748e3388582 100644
--- a/drivers/target/iscsi/iscsi_target_login.c
+++ b/drivers/target/iscsi/iscsi_target_login.c@@ -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) {
diff --git a/include/net/ip.h b/include/net/ip.h
index 2fc52e26fa88b..5f5d8226b6abc 100644
--- a/include/net/ip.h
+++ b/include/net/ip.h@@ -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 */
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index 1733ac78c21aa..62e642ab80126 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c@@ -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.
--
2.26.2