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authorPhilipp Hachtmann <phacht@linux.vnet.ibm.com>2014-05-28 12:22:28 +0400
committerDavid S. Miller <davem@davemloft.net>2014-05-31 04:35:23 +0400
commit53a4b4995edc1b9eddf6cee342479f86cbae4337 (patch)
treef070b61d0413ae5ac205edd4399906510adac3a6 /net/iucv
parent078252e0e877b50fcd42d3bd0d112f1f7c8518e8 (diff)
downloadlinux-53a4b4995edc1b9eddf6cee342479f86cbae4337.tar.xz
af_iucv: Add automatic (source) iucv_name to bind
If a socket is bound to an address using before calling connect it is usual to leave it to the network system to choose an appropriate outgoing application name respective port address. af_iucv on VM uses a counter and uses simple numbers as unique identifiers. This behaviour was missing when af_iucv is used with HiperSockets. This patch contains a simple approach to harmonize af_iucv's behaviour. Signed-off-by: Philipp Hachtmann <phacht@linux.vnet.ibm.com> Signed-off-by: Frank Blaschka <blaschka@linux.vnet.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/iucv')
-rw-r--r--net/iucv/af_iucv.c29
1 files changed, 18 insertions, 11 deletions
diff --git a/net/iucv/af_iucv.c b/net/iucv/af_iucv.c
index 8c9d7302c846..60f5c20d510a 100644
--- a/net/iucv/af_iucv.c
+++ b/net/iucv/af_iucv.c
@@ -682,6 +682,18 @@ struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock)
return NULL;
}
+static void __iucv_auto_name(struct iucv_sock *iucv)
+{
+ char name[12];
+
+ sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name));
+ while (__iucv_get_sock_by_name(name)) {
+ sprintf(name, "%08x",
+ atomic_inc_return(&iucv_sk_list.autobind_name));
+ }
+ memcpy(iucv->src_name, name, 8);
+}
+
/* Bind an unbound socket */
static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
int addr_len)
@@ -724,8 +736,12 @@ static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
rcu_read_lock();
for_each_netdev_rcu(&init_net, dev) {
if (!memcmp(dev->perm_addr, uid, 8)) {
- memcpy(iucv->src_name, sa->siucv_name, 8);
memcpy(iucv->src_user_id, sa->siucv_user_id, 8);
+ /* Check for unitialized siucv_name */
+ if (strncmp(sa->siucv_name, " ", 8) == 0)
+ __iucv_auto_name(iucv);
+ else
+ memcpy(iucv->src_name, sa->siucv_name, 8);
sk->sk_bound_dev_if = dev->ifindex;
iucv->hs_dev = dev;
dev_hold(dev);
@@ -763,7 +779,6 @@ done:
static int iucv_sock_autobind(struct sock *sk)
{
struct iucv_sock *iucv = iucv_sk(sk);
- char name[12];
int err = 0;
if (unlikely(!pr_iucv))
@@ -772,17 +787,9 @@ static int iucv_sock_autobind(struct sock *sk)
memcpy(iucv->src_user_id, iucv_userid, 8);
write_lock_bh(&iucv_sk_list.lock);
-
- sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name));
- while (__iucv_get_sock_by_name(name)) {
- sprintf(name, "%08x",
- atomic_inc_return(&iucv_sk_list.autobind_name));
- }
-
+ __iucv_auto_name(iucv);
write_unlock_bh(&iucv_sk_list.lock);
- memcpy(&iucv->src_name, name, 8);
-
if (!iucv->msglimit)
iucv->msglimit = IUCV_QUEUELEN_DEFAULT;