mirror of
https://github.com/torvalds/linux
synced 2024-11-05 18:23:50 +00:00
a56635a56f
Add a spin_unlock missing on the error path. There seems like no reason why the lock should continue to be held if the kzalloc fail. The semantic match that finds this problem is as follows: (http://coccinelle.lip6.fr/) // <smpl> @@ expression E1; @@ * spin_lock(E1,...); <+... when != E1 if (...) { ... when != E1 * return ...; } ...+> * spin_unlock(E1,...); // </smpl> Signed-off-by: Julia Lawall <julia@diku.dk> Signed-off-by: David S. Miller <davem@davemloft.net>
1800 lines
41 KiB
C
1800 lines
41 KiB
C
/*
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* IUCV protocol stack for Linux on zSeries
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*
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* Copyright IBM Corp. 2006, 2009
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*
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* Author(s): Jennifer Hunt <jenhunt@us.ibm.com>
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* Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
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* PM functions:
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* Ursula Braun <ursula.braun@de.ibm.com>
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*/
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#define KMSG_COMPONENT "af_iucv"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/list.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/skbuff.h>
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#include <linux/init.h>
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#include <linux/poll.h>
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#include <net/sock.h>
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#include <asm/ebcdic.h>
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#include <asm/cpcmd.h>
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#include <linux/kmod.h>
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#include <net/iucv/iucv.h>
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#include <net/iucv/af_iucv.h>
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#define VERSION "1.1"
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static char iucv_userid[80];
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static const struct proto_ops iucv_sock_ops;
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static struct proto iucv_proto = {
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.name = "AF_IUCV",
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.owner = THIS_MODULE,
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.obj_size = sizeof(struct iucv_sock),
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};
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/* special AF_IUCV IPRM messages */
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static const u8 iprm_shutdown[8] =
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{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01};
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#define TRGCLS_SIZE (sizeof(((struct iucv_message *)0)->class))
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/* macros to set/get socket control buffer at correct offset */
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#define CB_TAG(skb) ((skb)->cb) /* iucv message tag */
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#define CB_TAG_LEN (sizeof(((struct iucv_message *) 0)->tag))
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#define CB_TRGCLS(skb) ((skb)->cb + CB_TAG_LEN) /* iucv msg target class */
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#define CB_TRGCLS_LEN (TRGCLS_SIZE)
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#define __iucv_sock_wait(sk, condition, timeo, ret) \
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do { \
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DEFINE_WAIT(__wait); \
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long __timeo = timeo; \
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ret = 0; \
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prepare_to_wait(sk_sleep(sk), &__wait, TASK_INTERRUPTIBLE); \
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while (!(condition)) { \
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if (!__timeo) { \
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ret = -EAGAIN; \
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break; \
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} \
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if (signal_pending(current)) { \
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ret = sock_intr_errno(__timeo); \
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break; \
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} \
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release_sock(sk); \
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__timeo = schedule_timeout(__timeo); \
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lock_sock(sk); \
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ret = sock_error(sk); \
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if (ret) \
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break; \
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} \
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finish_wait(sk_sleep(sk), &__wait); \
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} while (0)
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#define iucv_sock_wait(sk, condition, timeo) \
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({ \
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int __ret = 0; \
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if (!(condition)) \
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__iucv_sock_wait(sk, condition, timeo, __ret); \
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__ret; \
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})
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static void iucv_sock_kill(struct sock *sk);
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static void iucv_sock_close(struct sock *sk);
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/* Call Back functions */
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static void iucv_callback_rx(struct iucv_path *, struct iucv_message *);
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static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *);
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static void iucv_callback_connack(struct iucv_path *, u8 ipuser[16]);
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static int iucv_callback_connreq(struct iucv_path *, u8 ipvmid[8],
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u8 ipuser[16]);
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static void iucv_callback_connrej(struct iucv_path *, u8 ipuser[16]);
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static void iucv_callback_shutdown(struct iucv_path *, u8 ipuser[16]);
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static struct iucv_sock_list iucv_sk_list = {
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.lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock),
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.autobind_name = ATOMIC_INIT(0)
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};
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static struct iucv_handler af_iucv_handler = {
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.path_pending = iucv_callback_connreq,
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.path_complete = iucv_callback_connack,
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.path_severed = iucv_callback_connrej,
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.message_pending = iucv_callback_rx,
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.message_complete = iucv_callback_txdone,
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.path_quiesced = iucv_callback_shutdown,
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};
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static inline void high_nmcpy(unsigned char *dst, char *src)
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{
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memcpy(dst, src, 8);
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}
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static inline void low_nmcpy(unsigned char *dst, char *src)
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{
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memcpy(&dst[8], src, 8);
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}
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static int afiucv_pm_prepare(struct device *dev)
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{
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#ifdef CONFIG_PM_DEBUG
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printk(KERN_WARNING "afiucv_pm_prepare\n");
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#endif
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return 0;
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}
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static void afiucv_pm_complete(struct device *dev)
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{
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#ifdef CONFIG_PM_DEBUG
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printk(KERN_WARNING "afiucv_pm_complete\n");
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#endif
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}
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/**
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* afiucv_pm_freeze() - Freeze PM callback
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* @dev: AFIUCV dummy device
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*
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* Sever all established IUCV communication pathes
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*/
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static int afiucv_pm_freeze(struct device *dev)
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{
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struct iucv_sock *iucv;
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struct sock *sk;
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struct hlist_node *node;
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int err = 0;
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#ifdef CONFIG_PM_DEBUG
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printk(KERN_WARNING "afiucv_pm_freeze\n");
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#endif
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read_lock(&iucv_sk_list.lock);
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sk_for_each(sk, node, &iucv_sk_list.head) {
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iucv = iucv_sk(sk);
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skb_queue_purge(&iucv->send_skb_q);
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skb_queue_purge(&iucv->backlog_skb_q);
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switch (sk->sk_state) {
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case IUCV_SEVERED:
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case IUCV_DISCONN:
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case IUCV_CLOSING:
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case IUCV_CONNECTED:
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if (iucv->path) {
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err = iucv_path_sever(iucv->path, NULL);
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iucv_path_free(iucv->path);
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iucv->path = NULL;
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}
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break;
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case IUCV_OPEN:
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case IUCV_BOUND:
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case IUCV_LISTEN:
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case IUCV_CLOSED:
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default:
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break;
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}
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}
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read_unlock(&iucv_sk_list.lock);
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return err;
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}
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/**
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* afiucv_pm_restore_thaw() - Thaw and restore PM callback
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* @dev: AFIUCV dummy device
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*
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* socket clean up after freeze
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*/
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static int afiucv_pm_restore_thaw(struct device *dev)
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{
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struct iucv_sock *iucv;
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struct sock *sk;
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struct hlist_node *node;
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#ifdef CONFIG_PM_DEBUG
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printk(KERN_WARNING "afiucv_pm_restore_thaw\n");
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#endif
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read_lock(&iucv_sk_list.lock);
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sk_for_each(sk, node, &iucv_sk_list.head) {
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iucv = iucv_sk(sk);
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switch (sk->sk_state) {
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case IUCV_CONNECTED:
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sk->sk_err = EPIPE;
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sk->sk_state = IUCV_DISCONN;
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sk->sk_state_change(sk);
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break;
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case IUCV_DISCONN:
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case IUCV_SEVERED:
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case IUCV_CLOSING:
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case IUCV_LISTEN:
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case IUCV_BOUND:
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case IUCV_OPEN:
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default:
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break;
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}
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}
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read_unlock(&iucv_sk_list.lock);
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return 0;
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}
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static const struct dev_pm_ops afiucv_pm_ops = {
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.prepare = afiucv_pm_prepare,
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.complete = afiucv_pm_complete,
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.freeze = afiucv_pm_freeze,
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.thaw = afiucv_pm_restore_thaw,
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.restore = afiucv_pm_restore_thaw,
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};
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static struct device_driver af_iucv_driver = {
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.owner = THIS_MODULE,
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.name = "afiucv",
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.bus = &iucv_bus,
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.pm = &afiucv_pm_ops,
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};
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/* dummy device used as trigger for PM functions */
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static struct device *af_iucv_dev;
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/**
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* iucv_msg_length() - Returns the length of an iucv message.
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* @msg: Pointer to struct iucv_message, MUST NOT be NULL
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*
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* The function returns the length of the specified iucv message @msg of data
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* stored in a buffer and of data stored in the parameter list (PRMDATA).
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*
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* For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket
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* data:
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* PRMDATA[0..6] socket data (max 7 bytes);
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* PRMDATA[7] socket data length value (len is 0xff - PRMDATA[7])
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*
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* The socket data length is computed by substracting the socket data length
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* value from 0xFF.
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* If the socket data len is greater 7, then PRMDATA can be used for special
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* notifications (see iucv_sock_shutdown); and further,
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* if the socket data len is > 7, the function returns 8.
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*
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* Use this function to allocate socket buffers to store iucv message data.
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*/
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static inline size_t iucv_msg_length(struct iucv_message *msg)
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{
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size_t datalen;
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if (msg->flags & IUCV_IPRMDATA) {
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datalen = 0xff - msg->rmmsg[7];
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return (datalen < 8) ? datalen : 8;
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}
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return msg->length;
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}
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/**
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* iucv_sock_in_state() - check for specific states
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* @sk: sock structure
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* @state: first iucv sk state
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* @state: second iucv sk state
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*
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* Returns true if the socket in either in the first or second state.
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*/
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static int iucv_sock_in_state(struct sock *sk, int state, int state2)
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{
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return (sk->sk_state == state || sk->sk_state == state2);
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}
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/**
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* iucv_below_msglim() - function to check if messages can be sent
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* @sk: sock structure
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*
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* Returns true if the send queue length is lower than the message limit.
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* Always returns true if the socket is not connected (no iucv path for
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* checking the message limit).
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*/
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static inline int iucv_below_msglim(struct sock *sk)
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{
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struct iucv_sock *iucv = iucv_sk(sk);
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if (sk->sk_state != IUCV_CONNECTED)
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return 1;
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return (skb_queue_len(&iucv->send_skb_q) < iucv->path->msglim);
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}
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/**
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* iucv_sock_wake_msglim() - Wake up thread waiting on msg limit
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*/
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static void iucv_sock_wake_msglim(struct sock *sk)
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{
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struct socket_wq *wq;
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rcu_read_lock();
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wq = rcu_dereference(sk->sk_wq);
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if (wq_has_sleeper(wq))
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wake_up_interruptible_all(&wq->wait);
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sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
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rcu_read_unlock();
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}
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/* Timers */
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static void iucv_sock_timeout(unsigned long arg)
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{
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struct sock *sk = (struct sock *)arg;
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bh_lock_sock(sk);
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sk->sk_err = ETIMEDOUT;
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sk->sk_state_change(sk);
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bh_unlock_sock(sk);
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iucv_sock_kill(sk);
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sock_put(sk);
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}
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static void iucv_sock_clear_timer(struct sock *sk)
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{
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sk_stop_timer(sk, &sk->sk_timer);
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}
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static struct sock *__iucv_get_sock_by_name(char *nm)
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{
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struct sock *sk;
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struct hlist_node *node;
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sk_for_each(sk, node, &iucv_sk_list.head)
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if (!memcmp(&iucv_sk(sk)->src_name, nm, 8))
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return sk;
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return NULL;
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}
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static void iucv_sock_destruct(struct sock *sk)
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{
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skb_queue_purge(&sk->sk_receive_queue);
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skb_queue_purge(&sk->sk_write_queue);
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}
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/* Cleanup Listen */
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static void iucv_sock_cleanup_listen(struct sock *parent)
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{
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struct sock *sk;
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/* Close non-accepted connections */
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while ((sk = iucv_accept_dequeue(parent, NULL))) {
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iucv_sock_close(sk);
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iucv_sock_kill(sk);
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}
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parent->sk_state = IUCV_CLOSED;
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}
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/* Kill socket (only if zapped and orphaned) */
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static void iucv_sock_kill(struct sock *sk)
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{
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if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
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return;
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iucv_sock_unlink(&iucv_sk_list, sk);
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sock_set_flag(sk, SOCK_DEAD);
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sock_put(sk);
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}
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/* Close an IUCV socket */
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static void iucv_sock_close(struct sock *sk)
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{
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unsigned char user_data[16];
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struct iucv_sock *iucv = iucv_sk(sk);
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int err;
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unsigned long timeo;
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iucv_sock_clear_timer(sk);
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lock_sock(sk);
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switch (sk->sk_state) {
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case IUCV_LISTEN:
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iucv_sock_cleanup_listen(sk);
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break;
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case IUCV_CONNECTED:
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case IUCV_DISCONN:
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err = 0;
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sk->sk_state = IUCV_CLOSING;
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sk->sk_state_change(sk);
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if (!skb_queue_empty(&iucv->send_skb_q)) {
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if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
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timeo = sk->sk_lingertime;
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else
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timeo = IUCV_DISCONN_TIMEOUT;
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err = iucv_sock_wait(sk,
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iucv_sock_in_state(sk, IUCV_CLOSED, 0),
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timeo);
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}
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case IUCV_CLOSING: /* fall through */
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sk->sk_state = IUCV_CLOSED;
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sk->sk_state_change(sk);
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if (iucv->path) {
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low_nmcpy(user_data, iucv->src_name);
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high_nmcpy(user_data, iucv->dst_name);
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ASCEBC(user_data, sizeof(user_data));
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err = iucv_path_sever(iucv->path, user_data);
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iucv_path_free(iucv->path);
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iucv->path = NULL;
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}
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sk->sk_err = ECONNRESET;
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sk->sk_state_change(sk);
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skb_queue_purge(&iucv->send_skb_q);
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skb_queue_purge(&iucv->backlog_skb_q);
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break;
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default:
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/* nothing to do here */
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break;
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}
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/* mark socket for deletion by iucv_sock_kill() */
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sock_set_flag(sk, SOCK_ZAPPED);
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release_sock(sk);
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}
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static void iucv_sock_init(struct sock *sk, struct sock *parent)
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{
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if (parent)
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sk->sk_type = parent->sk_type;
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}
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static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio)
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{
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struct sock *sk;
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sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto);
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if (!sk)
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return NULL;
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sock_init_data(sock, sk);
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INIT_LIST_HEAD(&iucv_sk(sk)->accept_q);
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spin_lock_init(&iucv_sk(sk)->accept_q_lock);
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skb_queue_head_init(&iucv_sk(sk)->send_skb_q);
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INIT_LIST_HEAD(&iucv_sk(sk)->message_q.list);
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spin_lock_init(&iucv_sk(sk)->message_q.lock);
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skb_queue_head_init(&iucv_sk(sk)->backlog_skb_q);
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iucv_sk(sk)->send_tag = 0;
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iucv_sk(sk)->flags = 0;
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iucv_sk(sk)->msglimit = IUCV_QUEUELEN_DEFAULT;
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iucv_sk(sk)->path = NULL;
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memset(&iucv_sk(sk)->src_user_id , 0, 32);
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sk->sk_destruct = iucv_sock_destruct;
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sk->sk_sndtimeo = IUCV_CONN_TIMEOUT;
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sk->sk_allocation = GFP_DMA;
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sock_reset_flag(sk, SOCK_ZAPPED);
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sk->sk_protocol = proto;
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sk->sk_state = IUCV_OPEN;
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setup_timer(&sk->sk_timer, iucv_sock_timeout, (unsigned long)sk);
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iucv_sock_link(&iucv_sk_list, sk);
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return sk;
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}
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/* Create an IUCV socket */
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static int iucv_sock_create(struct net *net, struct socket *sock, int protocol,
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int kern)
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{
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struct sock *sk;
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if (protocol && protocol != PF_IUCV)
|
|
return -EPROTONOSUPPORT;
|
|
|
|
sock->state = SS_UNCONNECTED;
|
|
|
|
switch (sock->type) {
|
|
case SOCK_STREAM:
|
|
sock->ops = &iucv_sock_ops;
|
|
break;
|
|
case SOCK_SEQPACKET:
|
|
/* currently, proto ops can handle both sk types */
|
|
sock->ops = &iucv_sock_ops;
|
|
break;
|
|
default:
|
|
return -ESOCKTNOSUPPORT;
|
|
}
|
|
|
|
sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL);
|
|
if (!sk)
|
|
return -ENOMEM;
|
|
|
|
iucv_sock_init(sk, NULL);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk)
|
|
{
|
|
write_lock_bh(&l->lock);
|
|
sk_add_node(sk, &l->head);
|
|
write_unlock_bh(&l->lock);
|
|
}
|
|
|
|
void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk)
|
|
{
|
|
write_lock_bh(&l->lock);
|
|
sk_del_node_init(sk);
|
|
write_unlock_bh(&l->lock);
|
|
}
|
|
|
|
void iucv_accept_enqueue(struct sock *parent, struct sock *sk)
|
|
{
|
|
unsigned long flags;
|
|
struct iucv_sock *par = iucv_sk(parent);
|
|
|
|
sock_hold(sk);
|
|
spin_lock_irqsave(&par->accept_q_lock, flags);
|
|
list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q);
|
|
spin_unlock_irqrestore(&par->accept_q_lock, flags);
|
|
iucv_sk(sk)->parent = parent;
|
|
sk_acceptq_added(parent);
|
|
}
|
|
|
|
void iucv_accept_unlink(struct sock *sk)
|
|
{
|
|
unsigned long flags;
|
|
struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent);
|
|
|
|
spin_lock_irqsave(&par->accept_q_lock, flags);
|
|
list_del_init(&iucv_sk(sk)->accept_q);
|
|
spin_unlock_irqrestore(&par->accept_q_lock, flags);
|
|
sk_acceptq_removed(iucv_sk(sk)->parent);
|
|
iucv_sk(sk)->parent = NULL;
|
|
sock_put(sk);
|
|
}
|
|
|
|
struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock)
|
|
{
|
|
struct iucv_sock *isk, *n;
|
|
struct sock *sk;
|
|
|
|
list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
|
|
sk = (struct sock *) isk;
|
|
lock_sock(sk);
|
|
|
|
if (sk->sk_state == IUCV_CLOSED) {
|
|
iucv_accept_unlink(sk);
|
|
release_sock(sk);
|
|
continue;
|
|
}
|
|
|
|
if (sk->sk_state == IUCV_CONNECTED ||
|
|
sk->sk_state == IUCV_SEVERED ||
|
|
sk->sk_state == IUCV_DISCONN || /* due to PM restore */
|
|
!newsock) {
|
|
iucv_accept_unlink(sk);
|
|
if (newsock)
|
|
sock_graft(sk, newsock);
|
|
|
|
if (sk->sk_state == IUCV_SEVERED)
|
|
sk->sk_state = IUCV_DISCONN;
|
|
|
|
release_sock(sk);
|
|
return sk;
|
|
}
|
|
|
|
release_sock(sk);
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/* Bind an unbound socket */
|
|
static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
|
|
int addr_len)
|
|
{
|
|
struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
|
|
struct sock *sk = sock->sk;
|
|
struct iucv_sock *iucv;
|
|
int err;
|
|
|
|
/* Verify the input sockaddr */
|
|
if (!addr || addr->sa_family != AF_IUCV)
|
|
return -EINVAL;
|
|
|
|
lock_sock(sk);
|
|
if (sk->sk_state != IUCV_OPEN) {
|
|
err = -EBADFD;
|
|
goto done;
|
|
}
|
|
|
|
write_lock_bh(&iucv_sk_list.lock);
|
|
|
|
iucv = iucv_sk(sk);
|
|
if (__iucv_get_sock_by_name(sa->siucv_name)) {
|
|
err = -EADDRINUSE;
|
|
goto done_unlock;
|
|
}
|
|
if (iucv->path) {
|
|
err = 0;
|
|
goto done_unlock;
|
|
}
|
|
|
|
/* Bind the socket */
|
|
memcpy(iucv->src_name, sa->siucv_name, 8);
|
|
|
|
/* Copy the user id */
|
|
memcpy(iucv->src_user_id, iucv_userid, 8);
|
|
sk->sk_state = IUCV_BOUND;
|
|
err = 0;
|
|
|
|
done_unlock:
|
|
/* Release the socket list lock */
|
|
write_unlock_bh(&iucv_sk_list.lock);
|
|
done:
|
|
release_sock(sk);
|
|
return err;
|
|
}
|
|
|
|
/* Automatically bind an unbound socket */
|
|
static int iucv_sock_autobind(struct sock *sk)
|
|
{
|
|
struct iucv_sock *iucv = iucv_sk(sk);
|
|
char query_buffer[80];
|
|
char name[12];
|
|
int err = 0;
|
|
|
|
/* Set the userid and name */
|
|
cpcmd("QUERY USERID", query_buffer, sizeof(query_buffer), &err);
|
|
if (unlikely(err))
|
|
return -EPROTO;
|
|
|
|
memcpy(iucv->src_user_id, query_buffer, 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));
|
|
}
|
|
|
|
write_unlock_bh(&iucv_sk_list.lock);
|
|
|
|
memcpy(&iucv->src_name, name, 8);
|
|
|
|
return err;
|
|
}
|
|
|
|
/* Connect an unconnected socket */
|
|
static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr,
|
|
int alen, int flags)
|
|
{
|
|
struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
|
|
struct sock *sk = sock->sk;
|
|
struct iucv_sock *iucv;
|
|
unsigned char user_data[16];
|
|
int err;
|
|
|
|
if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv))
|
|
return -EINVAL;
|
|
|
|
if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND)
|
|
return -EBADFD;
|
|
|
|
if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET)
|
|
return -EINVAL;
|
|
|
|
if (sk->sk_state == IUCV_OPEN) {
|
|
err = iucv_sock_autobind(sk);
|
|
if (unlikely(err))
|
|
return err;
|
|
}
|
|
|
|
lock_sock(sk);
|
|
|
|
/* Set the destination information */
|
|
memcpy(iucv_sk(sk)->dst_user_id, sa->siucv_user_id, 8);
|
|
memcpy(iucv_sk(sk)->dst_name, sa->siucv_name, 8);
|
|
|
|
high_nmcpy(user_data, sa->siucv_name);
|
|
low_nmcpy(user_data, iucv_sk(sk)->src_name);
|
|
ASCEBC(user_data, sizeof(user_data));
|
|
|
|
iucv = iucv_sk(sk);
|
|
/* Create path. */
|
|
iucv->path = iucv_path_alloc(iucv->msglimit,
|
|
IUCV_IPRMDATA, GFP_KERNEL);
|
|
if (!iucv->path) {
|
|
err = -ENOMEM;
|
|
goto done;
|
|
}
|
|
err = iucv_path_connect(iucv->path, &af_iucv_handler,
|
|
sa->siucv_user_id, NULL, user_data, sk);
|
|
if (err) {
|
|
iucv_path_free(iucv->path);
|
|
iucv->path = NULL;
|
|
switch (err) {
|
|
case 0x0b: /* Target communicator is not logged on */
|
|
err = -ENETUNREACH;
|
|
break;
|
|
case 0x0d: /* Max connections for this guest exceeded */
|
|
case 0x0e: /* Max connections for target guest exceeded */
|
|
err = -EAGAIN;
|
|
break;
|
|
case 0x0f: /* Missing IUCV authorization */
|
|
err = -EACCES;
|
|
break;
|
|
default:
|
|
err = -ECONNREFUSED;
|
|
break;
|
|
}
|
|
goto done;
|
|
}
|
|
|
|
if (sk->sk_state != IUCV_CONNECTED) {
|
|
err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED,
|
|
IUCV_DISCONN),
|
|
sock_sndtimeo(sk, flags & O_NONBLOCK));
|
|
}
|
|
|
|
if (sk->sk_state == IUCV_DISCONN) {
|
|
err = -ECONNREFUSED;
|
|
}
|
|
|
|
if (err) {
|
|
iucv_path_sever(iucv->path, NULL);
|
|
iucv_path_free(iucv->path);
|
|
iucv->path = NULL;
|
|
}
|
|
|
|
done:
|
|
release_sock(sk);
|
|
return err;
|
|
}
|
|
|
|
/* Move a socket into listening state. */
|
|
static int iucv_sock_listen(struct socket *sock, int backlog)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
int err;
|
|
|
|
lock_sock(sk);
|
|
|
|
err = -EINVAL;
|
|
if (sk->sk_state != IUCV_BOUND)
|
|
goto done;
|
|
|
|
if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET)
|
|
goto done;
|
|
|
|
sk->sk_max_ack_backlog = backlog;
|
|
sk->sk_ack_backlog = 0;
|
|
sk->sk_state = IUCV_LISTEN;
|
|
err = 0;
|
|
|
|
done:
|
|
release_sock(sk);
|
|
return err;
|
|
}
|
|
|
|
/* Accept a pending connection */
|
|
static int iucv_sock_accept(struct socket *sock, struct socket *newsock,
|
|
int flags)
|
|
{
|
|
DECLARE_WAITQUEUE(wait, current);
|
|
struct sock *sk = sock->sk, *nsk;
|
|
long timeo;
|
|
int err = 0;
|
|
|
|
lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
|
|
|
|
if (sk->sk_state != IUCV_LISTEN) {
|
|
err = -EBADFD;
|
|
goto done;
|
|
}
|
|
|
|
timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
|
|
|
|
/* Wait for an incoming connection */
|
|
add_wait_queue_exclusive(sk_sleep(sk), &wait);
|
|
while (!(nsk = iucv_accept_dequeue(sk, newsock))) {
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
if (!timeo) {
|
|
err = -EAGAIN;
|
|
break;
|
|
}
|
|
|
|
release_sock(sk);
|
|
timeo = schedule_timeout(timeo);
|
|
lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
|
|
|
|
if (sk->sk_state != IUCV_LISTEN) {
|
|
err = -EBADFD;
|
|
break;
|
|
}
|
|
|
|
if (signal_pending(current)) {
|
|
err = sock_intr_errno(timeo);
|
|
break;
|
|
}
|
|
}
|
|
|
|
set_current_state(TASK_RUNNING);
|
|
remove_wait_queue(sk_sleep(sk), &wait);
|
|
|
|
if (err)
|
|
goto done;
|
|
|
|
newsock->state = SS_CONNECTED;
|
|
|
|
done:
|
|
release_sock(sk);
|
|
return err;
|
|
}
|
|
|
|
static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr,
|
|
int *len, int peer)
|
|
{
|
|
struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr;
|
|
struct sock *sk = sock->sk;
|
|
|
|
addr->sa_family = AF_IUCV;
|
|
*len = sizeof(struct sockaddr_iucv);
|
|
|
|
if (peer) {
|
|
memcpy(siucv->siucv_user_id, iucv_sk(sk)->dst_user_id, 8);
|
|
memcpy(siucv->siucv_name, &iucv_sk(sk)->dst_name, 8);
|
|
} else {
|
|
memcpy(siucv->siucv_user_id, iucv_sk(sk)->src_user_id, 8);
|
|
memcpy(siucv->siucv_name, iucv_sk(sk)->src_name, 8);
|
|
}
|
|
memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port));
|
|
memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr));
|
|
memset(siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid));
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* iucv_send_iprm() - Send socket data in parameter list of an iucv message.
|
|
* @path: IUCV path
|
|
* @msg: Pointer to a struct iucv_message
|
|
* @skb: The socket data to send, skb->len MUST BE <= 7
|
|
*
|
|
* Send the socket data in the parameter list in the iucv message
|
|
* (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter
|
|
* list and the socket data len at index 7 (last byte).
|
|
* See also iucv_msg_length().
|
|
*
|
|
* Returns the error code from the iucv_message_send() call.
|
|
*/
|
|
static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg,
|
|
struct sk_buff *skb)
|
|
{
|
|
u8 prmdata[8];
|
|
|
|
memcpy(prmdata, (void *) skb->data, skb->len);
|
|
prmdata[7] = 0xff - (u8) skb->len;
|
|
return iucv_message_send(path, msg, IUCV_IPRMDATA, 0,
|
|
(void *) prmdata, 8);
|
|
}
|
|
|
|
static int iucv_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
|
|
struct msghdr *msg, size_t len)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct iucv_sock *iucv = iucv_sk(sk);
|
|
struct sk_buff *skb;
|
|
struct iucv_message txmsg;
|
|
struct cmsghdr *cmsg;
|
|
int cmsg_done;
|
|
long timeo;
|
|
char user_id[9];
|
|
char appl_id[9];
|
|
int err;
|
|
int noblock = msg->msg_flags & MSG_DONTWAIT;
|
|
|
|
err = sock_error(sk);
|
|
if (err)
|
|
return err;
|
|
|
|
if (msg->msg_flags & MSG_OOB)
|
|
return -EOPNOTSUPP;
|
|
|
|
/* SOCK_SEQPACKET: we do not support segmented records */
|
|
if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR))
|
|
return -EOPNOTSUPP;
|
|
|
|
lock_sock(sk);
|
|
|
|
if (sk->sk_shutdown & SEND_SHUTDOWN) {
|
|
err = -EPIPE;
|
|
goto out;
|
|
}
|
|
|
|
/* Return if the socket is not in connected state */
|
|
if (sk->sk_state != IUCV_CONNECTED) {
|
|
err = -ENOTCONN;
|
|
goto out;
|
|
}
|
|
|
|
/* initialize defaults */
|
|
cmsg_done = 0; /* check for duplicate headers */
|
|
txmsg.class = 0;
|
|
|
|
/* iterate over control messages */
|
|
for (cmsg = CMSG_FIRSTHDR(msg); cmsg;
|
|
cmsg = CMSG_NXTHDR(msg, cmsg)) {
|
|
|
|
if (!CMSG_OK(msg, cmsg)) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
if (cmsg->cmsg_level != SOL_IUCV)
|
|
continue;
|
|
|
|
if (cmsg->cmsg_type & cmsg_done) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
cmsg_done |= cmsg->cmsg_type;
|
|
|
|
switch (cmsg->cmsg_type) {
|
|
case SCM_IUCV_TRGCLS:
|
|
if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
/* set iucv message target class */
|
|
memcpy(&txmsg.class,
|
|
(void *) CMSG_DATA(cmsg), TRGCLS_SIZE);
|
|
|
|
break;
|
|
|
|
default:
|
|
err = -EINVAL;
|
|
goto out;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* allocate one skb for each iucv message:
|
|
* this is fine for SOCK_SEQPACKET (unless we want to support
|
|
* segmented records using the MSG_EOR flag), but
|
|
* for SOCK_STREAM we might want to improve it in future */
|
|
skb = sock_alloc_send_skb(sk, len, noblock, &err);
|
|
if (!skb)
|
|
goto out;
|
|
if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
|
|
err = -EFAULT;
|
|
goto fail;
|
|
}
|
|
|
|
/* wait if outstanding messages for iucv path has reached */
|
|
timeo = sock_sndtimeo(sk, noblock);
|
|
err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo);
|
|
if (err)
|
|
goto fail;
|
|
|
|
/* return -ECONNRESET if the socket is no longer connected */
|
|
if (sk->sk_state != IUCV_CONNECTED) {
|
|
err = -ECONNRESET;
|
|
goto fail;
|
|
}
|
|
|
|
/* increment and save iucv message tag for msg_completion cbk */
|
|
txmsg.tag = iucv->send_tag++;
|
|
memcpy(CB_TAG(skb), &txmsg.tag, CB_TAG_LEN);
|
|
skb_queue_tail(&iucv->send_skb_q, skb);
|
|
|
|
if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags)
|
|
&& skb->len <= 7) {
|
|
err = iucv_send_iprm(iucv->path, &txmsg, skb);
|
|
|
|
/* on success: there is no message_complete callback
|
|
* for an IPRMDATA msg; remove skb from send queue */
|
|
if (err == 0) {
|
|
skb_unlink(skb, &iucv->send_skb_q);
|
|
kfree_skb(skb);
|
|
}
|
|
|
|
/* this error should never happen since the
|
|
* IUCV_IPRMDATA path flag is set... sever path */
|
|
if (err == 0x15) {
|
|
iucv_path_sever(iucv->path, NULL);
|
|
skb_unlink(skb, &iucv->send_skb_q);
|
|
err = -EPIPE;
|
|
goto fail;
|
|
}
|
|
} else
|
|
err = iucv_message_send(iucv->path, &txmsg, 0, 0,
|
|
(void *) skb->data, skb->len);
|
|
if (err) {
|
|
if (err == 3) {
|
|
user_id[8] = 0;
|
|
memcpy(user_id, iucv->dst_user_id, 8);
|
|
appl_id[8] = 0;
|
|
memcpy(appl_id, iucv->dst_name, 8);
|
|
pr_err("Application %s on z/VM guest %s"
|
|
" exceeds message limit\n",
|
|
appl_id, user_id);
|
|
err = -EAGAIN;
|
|
} else
|
|
err = -EPIPE;
|
|
skb_unlink(skb, &iucv->send_skb_q);
|
|
goto fail;
|
|
}
|
|
|
|
release_sock(sk);
|
|
return len;
|
|
|
|
fail:
|
|
kfree_skb(skb);
|
|
out:
|
|
release_sock(sk);
|
|
return err;
|
|
}
|
|
|
|
/* iucv_fragment_skb() - Fragment a single IUCV message into multiple skb's
|
|
*
|
|
* Locking: must be called with message_q.lock held
|
|
*/
|
|
static int iucv_fragment_skb(struct sock *sk, struct sk_buff *skb, int len)
|
|
{
|
|
int dataleft, size, copied = 0;
|
|
struct sk_buff *nskb;
|
|
|
|
dataleft = len;
|
|
while (dataleft) {
|
|
if (dataleft >= sk->sk_rcvbuf / 4)
|
|
size = sk->sk_rcvbuf / 4;
|
|
else
|
|
size = dataleft;
|
|
|
|
nskb = alloc_skb(size, GFP_ATOMIC | GFP_DMA);
|
|
if (!nskb)
|
|
return -ENOMEM;
|
|
|
|
/* copy target class to control buffer of new skb */
|
|
memcpy(CB_TRGCLS(nskb), CB_TRGCLS(skb), CB_TRGCLS_LEN);
|
|
|
|
/* copy data fragment */
|
|
memcpy(nskb->data, skb->data + copied, size);
|
|
copied += size;
|
|
dataleft -= size;
|
|
|
|
skb_reset_transport_header(nskb);
|
|
skb_reset_network_header(nskb);
|
|
nskb->len = size;
|
|
|
|
skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, nskb);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* iucv_process_message() - Receive a single outstanding IUCV message
|
|
*
|
|
* Locking: must be called with message_q.lock held
|
|
*/
|
|
static void iucv_process_message(struct sock *sk, struct sk_buff *skb,
|
|
struct iucv_path *path,
|
|
struct iucv_message *msg)
|
|
{
|
|
int rc;
|
|
unsigned int len;
|
|
|
|
len = iucv_msg_length(msg);
|
|
|
|
/* store msg target class in the second 4 bytes of skb ctrl buffer */
|
|
/* Note: the first 4 bytes are reserved for msg tag */
|
|
memcpy(CB_TRGCLS(skb), &msg->class, CB_TRGCLS_LEN);
|
|
|
|
/* check for special IPRM messages (e.g. iucv_sock_shutdown) */
|
|
if ((msg->flags & IUCV_IPRMDATA) && len > 7) {
|
|
if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) {
|
|
skb->data = NULL;
|
|
skb->len = 0;
|
|
}
|
|
} else {
|
|
rc = iucv_message_receive(path, msg, msg->flags & IUCV_IPRMDATA,
|
|
skb->data, len, NULL);
|
|
if (rc) {
|
|
kfree_skb(skb);
|
|
return;
|
|
}
|
|
/* we need to fragment iucv messages for SOCK_STREAM only;
|
|
* for SOCK_SEQPACKET, it is only relevant if we support
|
|
* record segmentation using MSG_EOR (see also recvmsg()) */
|
|
if (sk->sk_type == SOCK_STREAM &&
|
|
skb->truesize >= sk->sk_rcvbuf / 4) {
|
|
rc = iucv_fragment_skb(sk, skb, len);
|
|
kfree_skb(skb);
|
|
skb = NULL;
|
|
if (rc) {
|
|
iucv_path_sever(path, NULL);
|
|
return;
|
|
}
|
|
skb = skb_dequeue(&iucv_sk(sk)->backlog_skb_q);
|
|
} else {
|
|
skb_reset_transport_header(skb);
|
|
skb_reset_network_header(skb);
|
|
skb->len = len;
|
|
}
|
|
}
|
|
|
|
if (sock_queue_rcv_skb(sk, skb))
|
|
skb_queue_head(&iucv_sk(sk)->backlog_skb_q, skb);
|
|
}
|
|
|
|
/* iucv_process_message_q() - Process outstanding IUCV messages
|
|
*
|
|
* Locking: must be called with message_q.lock held
|
|
*/
|
|
static void iucv_process_message_q(struct sock *sk)
|
|
{
|
|
struct iucv_sock *iucv = iucv_sk(sk);
|
|
struct sk_buff *skb;
|
|
struct sock_msg_q *p, *n;
|
|
|
|
list_for_each_entry_safe(p, n, &iucv->message_q.list, list) {
|
|
skb = alloc_skb(iucv_msg_length(&p->msg), GFP_ATOMIC | GFP_DMA);
|
|
if (!skb)
|
|
break;
|
|
iucv_process_message(sk, skb, p->path, &p->msg);
|
|
list_del(&p->list);
|
|
kfree(p);
|
|
if (!skb_queue_empty(&iucv->backlog_skb_q))
|
|
break;
|
|
}
|
|
}
|
|
|
|
static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
|
|
struct msghdr *msg, size_t len, int flags)
|
|
{
|
|
int noblock = flags & MSG_DONTWAIT;
|
|
struct sock *sk = sock->sk;
|
|
struct iucv_sock *iucv = iucv_sk(sk);
|
|
unsigned int copied, rlen;
|
|
struct sk_buff *skb, *rskb, *cskb;
|
|
int err = 0;
|
|
|
|
if ((sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_SEVERED) &&
|
|
skb_queue_empty(&iucv->backlog_skb_q) &&
|
|
skb_queue_empty(&sk->sk_receive_queue) &&
|
|
list_empty(&iucv->message_q.list))
|
|
return 0;
|
|
|
|
if (flags & (MSG_OOB))
|
|
return -EOPNOTSUPP;
|
|
|
|
/* receive/dequeue next skb:
|
|
* the function understands MSG_PEEK and, thus, does not dequeue skb */
|
|
skb = skb_recv_datagram(sk, flags, noblock, &err);
|
|
if (!skb) {
|
|
if (sk->sk_shutdown & RCV_SHUTDOWN)
|
|
return 0;
|
|
return err;
|
|
}
|
|
|
|
rlen = skb->len; /* real length of skb */
|
|
copied = min_t(unsigned int, rlen, len);
|
|
|
|
cskb = skb;
|
|
if (memcpy_toiovec(msg->msg_iov, cskb->data, copied)) {
|
|
if (!(flags & MSG_PEEK))
|
|
skb_queue_head(&sk->sk_receive_queue, skb);
|
|
return -EFAULT;
|
|
}
|
|
|
|
/* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */
|
|
if (sk->sk_type == SOCK_SEQPACKET) {
|
|
if (copied < rlen)
|
|
msg->msg_flags |= MSG_TRUNC;
|
|
/* each iucv message contains a complete record */
|
|
msg->msg_flags |= MSG_EOR;
|
|
}
|
|
|
|
/* create control message to store iucv msg target class:
|
|
* get the trgcls from the control buffer of the skb due to
|
|
* fragmentation of original iucv message. */
|
|
err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS,
|
|
CB_TRGCLS_LEN, CB_TRGCLS(skb));
|
|
if (err) {
|
|
if (!(flags & MSG_PEEK))
|
|
skb_queue_head(&sk->sk_receive_queue, skb);
|
|
return err;
|
|
}
|
|
|
|
/* Mark read part of skb as used */
|
|
if (!(flags & MSG_PEEK)) {
|
|
|
|
/* SOCK_STREAM: re-queue skb if it contains unreceived data */
|
|
if (sk->sk_type == SOCK_STREAM) {
|
|
skb_pull(skb, copied);
|
|
if (skb->len) {
|
|
skb_queue_head(&sk->sk_receive_queue, skb);
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
kfree_skb(skb);
|
|
|
|
/* Queue backlog skbs */
|
|
spin_lock_bh(&iucv->message_q.lock);
|
|
rskb = skb_dequeue(&iucv->backlog_skb_q);
|
|
while (rskb) {
|
|
if (sock_queue_rcv_skb(sk, rskb)) {
|
|
skb_queue_head(&iucv->backlog_skb_q,
|
|
rskb);
|
|
break;
|
|
} else {
|
|
rskb = skb_dequeue(&iucv->backlog_skb_q);
|
|
}
|
|
}
|
|
if (skb_queue_empty(&iucv->backlog_skb_q)) {
|
|
if (!list_empty(&iucv->message_q.list))
|
|
iucv_process_message_q(sk);
|
|
}
|
|
spin_unlock_bh(&iucv->message_q.lock);
|
|
}
|
|
|
|
done:
|
|
/* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
|
|
if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
|
|
copied = rlen;
|
|
|
|
return copied;
|
|
}
|
|
|
|
static inline unsigned int iucv_accept_poll(struct sock *parent)
|
|
{
|
|
struct iucv_sock *isk, *n;
|
|
struct sock *sk;
|
|
|
|
list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
|
|
sk = (struct sock *) isk;
|
|
|
|
if (sk->sk_state == IUCV_CONNECTED)
|
|
return POLLIN | POLLRDNORM;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
unsigned int iucv_sock_poll(struct file *file, struct socket *sock,
|
|
poll_table *wait)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
unsigned int mask = 0;
|
|
|
|
sock_poll_wait(file, sk_sleep(sk), wait);
|
|
|
|
if (sk->sk_state == IUCV_LISTEN)
|
|
return iucv_accept_poll(sk);
|
|
|
|
if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
|
|
mask |= POLLERR;
|
|
|
|
if (sk->sk_shutdown & RCV_SHUTDOWN)
|
|
mask |= POLLRDHUP;
|
|
|
|
if (sk->sk_shutdown == SHUTDOWN_MASK)
|
|
mask |= POLLHUP;
|
|
|
|
if (!skb_queue_empty(&sk->sk_receive_queue) ||
|
|
(sk->sk_shutdown & RCV_SHUTDOWN))
|
|
mask |= POLLIN | POLLRDNORM;
|
|
|
|
if (sk->sk_state == IUCV_CLOSED)
|
|
mask |= POLLHUP;
|
|
|
|
if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_SEVERED)
|
|
mask |= POLLIN;
|
|
|
|
if (sock_writeable(sk))
|
|
mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
|
|
else
|
|
set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
|
|
|
|
return mask;
|
|
}
|
|
|
|
static int iucv_sock_shutdown(struct socket *sock, int how)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct iucv_sock *iucv = iucv_sk(sk);
|
|
struct iucv_message txmsg;
|
|
int err = 0;
|
|
|
|
how++;
|
|
|
|
if ((how & ~SHUTDOWN_MASK) || !how)
|
|
return -EINVAL;
|
|
|
|
lock_sock(sk);
|
|
switch (sk->sk_state) {
|
|
case IUCV_DISCONN:
|
|
case IUCV_CLOSING:
|
|
case IUCV_SEVERED:
|
|
case IUCV_CLOSED:
|
|
err = -ENOTCONN;
|
|
goto fail;
|
|
|
|
default:
|
|
sk->sk_shutdown |= how;
|
|
break;
|
|
}
|
|
|
|
if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) {
|
|
txmsg.class = 0;
|
|
txmsg.tag = 0;
|
|
err = iucv_message_send(iucv->path, &txmsg, IUCV_IPRMDATA, 0,
|
|
(void *) iprm_shutdown, 8);
|
|
if (err) {
|
|
switch (err) {
|
|
case 1:
|
|
err = -ENOTCONN;
|
|
break;
|
|
case 2:
|
|
err = -ECONNRESET;
|
|
break;
|
|
default:
|
|
err = -ENOTCONN;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
|
|
err = iucv_path_quiesce(iucv_sk(sk)->path, NULL);
|
|
if (err)
|
|
err = -ENOTCONN;
|
|
|
|
skb_queue_purge(&sk->sk_receive_queue);
|
|
}
|
|
|
|
/* Wake up anyone sleeping in poll */
|
|
sk->sk_state_change(sk);
|
|
|
|
fail:
|
|
release_sock(sk);
|
|
return err;
|
|
}
|
|
|
|
static int iucv_sock_release(struct socket *sock)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
int err = 0;
|
|
|
|
if (!sk)
|
|
return 0;
|
|
|
|
iucv_sock_close(sk);
|
|
|
|
/* Unregister with IUCV base support */
|
|
if (iucv_sk(sk)->path) {
|
|
iucv_path_sever(iucv_sk(sk)->path, NULL);
|
|
iucv_path_free(iucv_sk(sk)->path);
|
|
iucv_sk(sk)->path = NULL;
|
|
}
|
|
|
|
sock_orphan(sk);
|
|
iucv_sock_kill(sk);
|
|
return err;
|
|
}
|
|
|
|
/* getsockopt and setsockopt */
|
|
static int iucv_sock_setsockopt(struct socket *sock, int level, int optname,
|
|
char __user *optval, unsigned int optlen)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct iucv_sock *iucv = iucv_sk(sk);
|
|
int val;
|
|
int rc;
|
|
|
|
if (level != SOL_IUCV)
|
|
return -ENOPROTOOPT;
|
|
|
|
if (optlen < sizeof(int))
|
|
return -EINVAL;
|
|
|
|
if (get_user(val, (int __user *) optval))
|
|
return -EFAULT;
|
|
|
|
rc = 0;
|
|
|
|
lock_sock(sk);
|
|
switch (optname) {
|
|
case SO_IPRMDATA_MSG:
|
|
if (val)
|
|
iucv->flags |= IUCV_IPRMDATA;
|
|
else
|
|
iucv->flags &= ~IUCV_IPRMDATA;
|
|
break;
|
|
case SO_MSGLIMIT:
|
|
switch (sk->sk_state) {
|
|
case IUCV_OPEN:
|
|
case IUCV_BOUND:
|
|
if (val < 1 || val > (u16)(~0))
|
|
rc = -EINVAL;
|
|
else
|
|
iucv->msglimit = val;
|
|
break;
|
|
default:
|
|
rc = -EINVAL;
|
|
break;
|
|
}
|
|
break;
|
|
default:
|
|
rc = -ENOPROTOOPT;
|
|
break;
|
|
}
|
|
release_sock(sk);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int iucv_sock_getsockopt(struct socket *sock, int level, int optname,
|
|
char __user *optval, int __user *optlen)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct iucv_sock *iucv = iucv_sk(sk);
|
|
int val, len;
|
|
|
|
if (level != SOL_IUCV)
|
|
return -ENOPROTOOPT;
|
|
|
|
if (get_user(len, optlen))
|
|
return -EFAULT;
|
|
|
|
if (len < 0)
|
|
return -EINVAL;
|
|
|
|
len = min_t(unsigned int, len, sizeof(int));
|
|
|
|
switch (optname) {
|
|
case SO_IPRMDATA_MSG:
|
|
val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0;
|
|
break;
|
|
case SO_MSGLIMIT:
|
|
lock_sock(sk);
|
|
val = (iucv->path != NULL) ? iucv->path->msglim /* connected */
|
|
: iucv->msglimit; /* default */
|
|
release_sock(sk);
|
|
break;
|
|
default:
|
|
return -ENOPROTOOPT;
|
|
}
|
|
|
|
if (put_user(len, optlen))
|
|
return -EFAULT;
|
|
if (copy_to_user(optval, &val, len))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* Callback wrappers - called from iucv base support */
|
|
static int iucv_callback_connreq(struct iucv_path *path,
|
|
u8 ipvmid[8], u8 ipuser[16])
|
|
{
|
|
unsigned char user_data[16];
|
|
unsigned char nuser_data[16];
|
|
unsigned char src_name[8];
|
|
struct hlist_node *node;
|
|
struct sock *sk, *nsk;
|
|
struct iucv_sock *iucv, *niucv;
|
|
int err;
|
|
|
|
memcpy(src_name, ipuser, 8);
|
|
EBCASC(src_name, 8);
|
|
/* Find out if this path belongs to af_iucv. */
|
|
read_lock(&iucv_sk_list.lock);
|
|
iucv = NULL;
|
|
sk = NULL;
|
|
sk_for_each(sk, node, &iucv_sk_list.head)
|
|
if (sk->sk_state == IUCV_LISTEN &&
|
|
!memcmp(&iucv_sk(sk)->src_name, src_name, 8)) {
|
|
/*
|
|
* Found a listening socket with
|
|
* src_name == ipuser[0-7].
|
|
*/
|
|
iucv = iucv_sk(sk);
|
|
break;
|
|
}
|
|
read_unlock(&iucv_sk_list.lock);
|
|
if (!iucv)
|
|
/* No socket found, not one of our paths. */
|
|
return -EINVAL;
|
|
|
|
bh_lock_sock(sk);
|
|
|
|
/* Check if parent socket is listening */
|
|
low_nmcpy(user_data, iucv->src_name);
|
|
high_nmcpy(user_data, iucv->dst_name);
|
|
ASCEBC(user_data, sizeof(user_data));
|
|
if (sk->sk_state != IUCV_LISTEN) {
|
|
err = iucv_path_sever(path, user_data);
|
|
iucv_path_free(path);
|
|
goto fail;
|
|
}
|
|
|
|
/* Check for backlog size */
|
|
if (sk_acceptq_is_full(sk)) {
|
|
err = iucv_path_sever(path, user_data);
|
|
iucv_path_free(path);
|
|
goto fail;
|
|
}
|
|
|
|
/* Create the new socket */
|
|
nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC);
|
|
if (!nsk) {
|
|
err = iucv_path_sever(path, user_data);
|
|
iucv_path_free(path);
|
|
goto fail;
|
|
}
|
|
|
|
niucv = iucv_sk(nsk);
|
|
iucv_sock_init(nsk, sk);
|
|
|
|
/* Set the new iucv_sock */
|
|
memcpy(niucv->dst_name, ipuser + 8, 8);
|
|
EBCASC(niucv->dst_name, 8);
|
|
memcpy(niucv->dst_user_id, ipvmid, 8);
|
|
memcpy(niucv->src_name, iucv->src_name, 8);
|
|
memcpy(niucv->src_user_id, iucv->src_user_id, 8);
|
|
niucv->path = path;
|
|
|
|
/* Call iucv_accept */
|
|
high_nmcpy(nuser_data, ipuser + 8);
|
|
memcpy(nuser_data + 8, niucv->src_name, 8);
|
|
ASCEBC(nuser_data + 8, 8);
|
|
|
|
/* set message limit for path based on msglimit of accepting socket */
|
|
niucv->msglimit = iucv->msglimit;
|
|
path->msglim = iucv->msglimit;
|
|
err = iucv_path_accept(path, &af_iucv_handler, nuser_data, nsk);
|
|
if (err) {
|
|
err = iucv_path_sever(path, user_data);
|
|
iucv_path_free(path);
|
|
iucv_sock_kill(nsk);
|
|
goto fail;
|
|
}
|
|
|
|
iucv_accept_enqueue(sk, nsk);
|
|
|
|
/* Wake up accept */
|
|
nsk->sk_state = IUCV_CONNECTED;
|
|
sk->sk_data_ready(sk, 1);
|
|
err = 0;
|
|
fail:
|
|
bh_unlock_sock(sk);
|
|
return 0;
|
|
}
|
|
|
|
static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
|
|
{
|
|
struct sock *sk = path->private;
|
|
|
|
sk->sk_state = IUCV_CONNECTED;
|
|
sk->sk_state_change(sk);
|
|
}
|
|
|
|
static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
|
|
{
|
|
struct sock *sk = path->private;
|
|
struct iucv_sock *iucv = iucv_sk(sk);
|
|
struct sk_buff *skb;
|
|
struct sock_msg_q *save_msg;
|
|
int len;
|
|
|
|
if (sk->sk_shutdown & RCV_SHUTDOWN) {
|
|
iucv_message_reject(path, msg);
|
|
return;
|
|
}
|
|
|
|
spin_lock(&iucv->message_q.lock);
|
|
|
|
if (!list_empty(&iucv->message_q.list) ||
|
|
!skb_queue_empty(&iucv->backlog_skb_q))
|
|
goto save_message;
|
|
|
|
len = atomic_read(&sk->sk_rmem_alloc);
|
|
len += iucv_msg_length(msg) + sizeof(struct sk_buff);
|
|
if (len > sk->sk_rcvbuf)
|
|
goto save_message;
|
|
|
|
skb = alloc_skb(iucv_msg_length(msg), GFP_ATOMIC | GFP_DMA);
|
|
if (!skb)
|
|
goto save_message;
|
|
|
|
iucv_process_message(sk, skb, path, msg);
|
|
goto out_unlock;
|
|
|
|
save_message:
|
|
save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
|
|
if (!save_msg)
|
|
goto out_unlock;
|
|
save_msg->path = path;
|
|
save_msg->msg = *msg;
|
|
|
|
list_add_tail(&save_msg->list, &iucv->message_q.list);
|
|
|
|
out_unlock:
|
|
spin_unlock(&iucv->message_q.lock);
|
|
}
|
|
|
|
static void iucv_callback_txdone(struct iucv_path *path,
|
|
struct iucv_message *msg)
|
|
{
|
|
struct sock *sk = path->private;
|
|
struct sk_buff *this = NULL;
|
|
struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q;
|
|
struct sk_buff *list_skb = list->next;
|
|
unsigned long flags;
|
|
|
|
if (!skb_queue_empty(list)) {
|
|
spin_lock_irqsave(&list->lock, flags);
|
|
|
|
while (list_skb != (struct sk_buff *)list) {
|
|
if (!memcmp(&msg->tag, CB_TAG(list_skb), CB_TAG_LEN)) {
|
|
this = list_skb;
|
|
break;
|
|
}
|
|
list_skb = list_skb->next;
|
|
}
|
|
if (this)
|
|
__skb_unlink(this, list);
|
|
|
|
spin_unlock_irqrestore(&list->lock, flags);
|
|
|
|
if (this) {
|
|
kfree_skb(this);
|
|
/* wake up any process waiting for sending */
|
|
iucv_sock_wake_msglim(sk);
|
|
}
|
|
}
|
|
BUG_ON(!this);
|
|
|
|
if (sk->sk_state == IUCV_CLOSING) {
|
|
if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
|
|
sk->sk_state = IUCV_CLOSED;
|
|
sk->sk_state_change(sk);
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
|
|
{
|
|
struct sock *sk = path->private;
|
|
|
|
if (!list_empty(&iucv_sk(sk)->accept_q))
|
|
sk->sk_state = IUCV_SEVERED;
|
|
else
|
|
sk->sk_state = IUCV_DISCONN;
|
|
|
|
sk->sk_state_change(sk);
|
|
}
|
|
|
|
/* called if the other communication side shuts down its RECV direction;
|
|
* in turn, the callback sets SEND_SHUTDOWN to disable sending of data.
|
|
*/
|
|
static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16])
|
|
{
|
|
struct sock *sk = path->private;
|
|
|
|
bh_lock_sock(sk);
|
|
if (sk->sk_state != IUCV_CLOSED) {
|
|
sk->sk_shutdown |= SEND_SHUTDOWN;
|
|
sk->sk_state_change(sk);
|
|
}
|
|
bh_unlock_sock(sk);
|
|
}
|
|
|
|
static const struct proto_ops iucv_sock_ops = {
|
|
.family = PF_IUCV,
|
|
.owner = THIS_MODULE,
|
|
.release = iucv_sock_release,
|
|
.bind = iucv_sock_bind,
|
|
.connect = iucv_sock_connect,
|
|
.listen = iucv_sock_listen,
|
|
.accept = iucv_sock_accept,
|
|
.getname = iucv_sock_getname,
|
|
.sendmsg = iucv_sock_sendmsg,
|
|
.recvmsg = iucv_sock_recvmsg,
|
|
.poll = iucv_sock_poll,
|
|
.ioctl = sock_no_ioctl,
|
|
.mmap = sock_no_mmap,
|
|
.socketpair = sock_no_socketpair,
|
|
.shutdown = iucv_sock_shutdown,
|
|
.setsockopt = iucv_sock_setsockopt,
|
|
.getsockopt = iucv_sock_getsockopt,
|
|
};
|
|
|
|
static const struct net_proto_family iucv_sock_family_ops = {
|
|
.family = AF_IUCV,
|
|
.owner = THIS_MODULE,
|
|
.create = iucv_sock_create,
|
|
};
|
|
|
|
static int __init afiucv_init(void)
|
|
{
|
|
int err;
|
|
|
|
if (!MACHINE_IS_VM) {
|
|
pr_err("The af_iucv module cannot be loaded"
|
|
" without z/VM\n");
|
|
err = -EPROTONOSUPPORT;
|
|
goto out;
|
|
}
|
|
cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
|
|
if (unlikely(err)) {
|
|
WARN_ON(err);
|
|
err = -EPROTONOSUPPORT;
|
|
goto out;
|
|
}
|
|
|
|
err = iucv_register(&af_iucv_handler, 0);
|
|
if (err)
|
|
goto out;
|
|
err = proto_register(&iucv_proto, 0);
|
|
if (err)
|
|
goto out_iucv;
|
|
err = sock_register(&iucv_sock_family_ops);
|
|
if (err)
|
|
goto out_proto;
|
|
/* establish dummy device */
|
|
err = driver_register(&af_iucv_driver);
|
|
if (err)
|
|
goto out_sock;
|
|
af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL);
|
|
if (!af_iucv_dev) {
|
|
err = -ENOMEM;
|
|
goto out_driver;
|
|
}
|
|
dev_set_name(af_iucv_dev, "af_iucv");
|
|
af_iucv_dev->bus = &iucv_bus;
|
|
af_iucv_dev->parent = iucv_root;
|
|
af_iucv_dev->release = (void (*)(struct device *))kfree;
|
|
af_iucv_dev->driver = &af_iucv_driver;
|
|
err = device_register(af_iucv_dev);
|
|
if (err)
|
|
goto out_driver;
|
|
|
|
return 0;
|
|
|
|
out_driver:
|
|
driver_unregister(&af_iucv_driver);
|
|
out_sock:
|
|
sock_unregister(PF_IUCV);
|
|
out_proto:
|
|
proto_unregister(&iucv_proto);
|
|
out_iucv:
|
|
iucv_unregister(&af_iucv_handler, 0);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static void __exit afiucv_exit(void)
|
|
{
|
|
device_unregister(af_iucv_dev);
|
|
driver_unregister(&af_iucv_driver);
|
|
sock_unregister(PF_IUCV);
|
|
proto_unregister(&iucv_proto);
|
|
iucv_unregister(&af_iucv_handler, 0);
|
|
}
|
|
|
|
module_init(afiucv_init);
|
|
module_exit(afiucv_exit);
|
|
|
|
MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>");
|
|
MODULE_DESCRIPTION("IUCV Sockets ver " VERSION);
|
|
MODULE_VERSION(VERSION);
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS_NETPROTO(PF_IUCV);
|