245 lines
6.2 KiB
C
245 lines
6.2 KiB
C
|
// SPDX-License-Identifier: GPL-2.0
|
||
|
|
/* net/atm/signaling.c - ATM signaling */
|
||
|
|
|
||
|
|
/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
|
||
|
|
|
||
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
|
||
|
|
|
||
|
|
#include <linux/errno.h> /* error codes */
|
||
|
|
#include <linux/kernel.h> /* printk */
|
||
|
|
#include <linux/skbuff.h>
|
||
|
|
#include <linux/wait.h>
|
||
|
|
#include <linux/sched.h> /* jiffies and HZ */
|
||
|
|
#include <linux/atm.h> /* ATM stuff */
|
||
|
|
#include <linux/atmsap.h>
|
||
|
|
#include <linux/atmsvc.h>
|
||
|
|
#include <linux/atmdev.h>
|
||
|
|
#include <linux/bitops.h>
|
||
|
|
#include <linux/slab.h>
|
||
|
|
|
||
|
|
#include "resources.h"
|
||
|
|
#include "signaling.h"
|
||
|
|
|
||
|
|
struct atm_vcc *sigd = NULL;
|
||
|
|
|
||
|
|
static void sigd_put_skb(struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
if (!sigd) {
|
||
|
|
pr_debug("atmsvc: no signaling daemon\n");
|
||
|
|
kfree_skb(skb);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
atm_force_charge(sigd, skb->truesize);
|
||
|
|
skb_queue_tail(&sk_atm(sigd)->sk_receive_queue, skb);
|
||
|
|
sk_atm(sigd)->sk_data_ready(sk_atm(sigd));
|
||
|
|
}
|
||
|
|
|
||
|
|
static void modify_qos(struct atm_vcc *vcc, struct atmsvc_msg *msg)
|
||
|
|
{
|
||
|
|
struct sk_buff *skb;
|
||
|
|
|
||
|
|
if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
|
||
|
|
!test_bit(ATM_VF_READY, &vcc->flags))
|
||
|
|
return;
|
||
|
|
msg->type = as_error;
|
||
|
|
if (!vcc->dev->ops->change_qos)
|
||
|
|
msg->reply = -EOPNOTSUPP;
|
||
|
|
else {
|
||
|
|
/* should lock VCC */
|
||
|
|
msg->reply = vcc->dev->ops->change_qos(vcc, &msg->qos,
|
||
|
|
msg->reply);
|
||
|
|
if (!msg->reply)
|
||
|
|
msg->type = as_okay;
|
||
|
|
}
|
||
|
|
/*
|
||
|
|
* Should probably just turn around the old skb. But the, the buffer
|
||
|
|
* space accounting needs to follow the change too. Maybe later.
|
||
|
|
*/
|
||
|
|
while (!(skb = alloc_skb(sizeof(struct atmsvc_msg), GFP_KERNEL)))
|
||
|
|
schedule();
|
||
|
|
*(struct atmsvc_msg *)skb_put(skb, sizeof(struct atmsvc_msg)) = *msg;
|
||
|
|
sigd_put_skb(skb);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int sigd_send(struct atm_vcc *vcc, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
struct atmsvc_msg *msg;
|
||
|
|
struct atm_vcc *session_vcc;
|
||
|
|
struct sock *sk;
|
||
|
|
|
||
|
|
msg = (struct atmsvc_msg *) skb->data;
|
||
|
|
WARN_ON(refcount_sub_and_test(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc));
|
||
|
|
vcc = *(struct atm_vcc **) &msg->vcc;
|
||
|
|
pr_debug("%d (0x%lx)\n", (int)msg->type, (unsigned long)vcc);
|
||
|
|
sk = sk_atm(vcc);
|
||
|
|
|
||
|
|
switch (msg->type) {
|
||
|
|
case as_okay:
|
||
|
|
sk->sk_err = -msg->reply;
|
||
|
|
clear_bit(ATM_VF_WAITING, &vcc->flags);
|
||
|
|
if (!*vcc->local.sas_addr.prv && !*vcc->local.sas_addr.pub) {
|
||
|
|
vcc->local.sas_family = AF_ATMSVC;
|
||
|
|
memcpy(vcc->local.sas_addr.prv,
|
||
|
|
msg->local.sas_addr.prv, ATM_ESA_LEN);
|
||
|
|
memcpy(vcc->local.sas_addr.pub,
|
||
|
|
msg->local.sas_addr.pub, ATM_E164_LEN + 1);
|
||
|
|
}
|
||
|
|
session_vcc = vcc->session ? vcc->session : vcc;
|
||
|
|
if (session_vcc->vpi || session_vcc->vci)
|
||
|
|
break;
|
||
|
|
session_vcc->itf = msg->pvc.sap_addr.itf;
|
||
|
|
session_vcc->vpi = msg->pvc.sap_addr.vpi;
|
||
|
|
session_vcc->vci = msg->pvc.sap_addr.vci;
|
||
|
|
if (session_vcc->vpi || session_vcc->vci)
|
||
|
|
session_vcc->qos = msg->qos;
|
||
|
|
break;
|
||
|
|
case as_error:
|
||
|
|
clear_bit(ATM_VF_REGIS, &vcc->flags);
|
||
|
|
clear_bit(ATM_VF_READY, &vcc->flags);
|
||
|
|
sk->sk_err = -msg->reply;
|
||
|
|
clear_bit(ATM_VF_WAITING, &vcc->flags);
|
||
|
|
break;
|
||
|
|
case as_indicate:
|
||
|
|
vcc = *(struct atm_vcc **)&msg->listen_vcc;
|
||
|
|
sk = sk_atm(vcc);
|
||
|
|
pr_debug("as_indicate!!!\n");
|
||
|
|
lock_sock(sk);
|
||
|
|
if (sk_acceptq_is_full(sk)) {
|
||
|
|
sigd_enq(NULL, as_reject, vcc, NULL, NULL);
|
||
|
|
dev_kfree_skb(skb);
|
||
|
|
goto as_indicate_complete;
|
||
|
|
}
|
||
|
|
sk->sk_ack_backlog++;
|
||
|
|
skb_queue_tail(&sk->sk_receive_queue, skb);
|
||
|
|
pr_debug("waking sk_sleep(sk) 0x%p\n", sk_sleep(sk));
|
||
|
|
sk->sk_state_change(sk);
|
||
|
|
as_indicate_complete:
|
||
|
|
release_sock(sk);
|
||
|
|
return 0;
|
||
|
|
case as_close:
|
||
|
|
set_bit(ATM_VF_RELEASED, &vcc->flags);
|
||
|
|
vcc_release_async(vcc, msg->reply);
|
||
|
|
goto out;
|
||
|
|
case as_modify:
|
||
|
|
modify_qos(vcc, msg);
|
||
|
|
break;
|
||
|
|
case as_addparty:
|
||
|
|
case as_dropparty:
|
||
|
|
sk->sk_err_soft = -msg->reply;
|
||
|
|
/* < 0 failure, otherwise ep_ref */
|
||
|
|
clear_bit(ATM_VF_WAITING, &vcc->flags);
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
pr_alert("bad message type %d\n", (int)msg->type);
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
sk->sk_state_change(sk);
|
||
|
|
out:
|
||
|
|
dev_kfree_skb(skb);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
void sigd_enq2(struct atm_vcc *vcc, enum atmsvc_msg_type type,
|
||
|
|
struct atm_vcc *listen_vcc, const struct sockaddr_atmpvc *pvc,
|
||
|
|
const struct sockaddr_atmsvc *svc, const struct atm_qos *qos,
|
||
|
|
int reply)
|
||
|
|
{
|
||
|
|
struct sk_buff *skb;
|
||
|
|
struct atmsvc_msg *msg;
|
||
|
|
static unsigned int session = 0;
|
||
|
|
|
||
|
|
pr_debug("%d (0x%p)\n", (int)type, vcc);
|
||
|
|
while (!(skb = alloc_skb(sizeof(struct atmsvc_msg), GFP_KERNEL)))
|
||
|
|
schedule();
|
||
|
|
msg = skb_put_zero(skb, sizeof(struct atmsvc_msg));
|
||
|
|
msg->type = type;
|
||
|
|
*(struct atm_vcc **) &msg->vcc = vcc;
|
||
|
|
*(struct atm_vcc **) &msg->listen_vcc = listen_vcc;
|
||
|
|
msg->reply = reply;
|
||
|
|
if (qos)
|
||
|
|
msg->qos = *qos;
|
||
|
|
if (vcc)
|
||
|
|
msg->sap = vcc->sap;
|
||
|
|
if (svc)
|
||
|
|
msg->svc = *svc;
|
||
|
|
if (vcc)
|
||
|
|
msg->local = vcc->local;
|
||
|
|
if (pvc)
|
||
|
|
msg->pvc = *pvc;
|
||
|
|
if (vcc) {
|
||
|
|
if (type == as_connect && test_bit(ATM_VF_SESSION, &vcc->flags))
|
||
|
|
msg->session = ++session;
|
||
|
|
/* every new pmp connect gets the next session number */
|
||
|
|
}
|
||
|
|
sigd_put_skb(skb);
|
||
|
|
if (vcc)
|
||
|
|
set_bit(ATM_VF_REGIS, &vcc->flags);
|
||
|
|
}
|
||
|
|
|
||
|
|
void sigd_enq(struct atm_vcc *vcc, enum atmsvc_msg_type type,
|
||
|
|
struct atm_vcc *listen_vcc, const struct sockaddr_atmpvc *pvc,
|
||
|
|
const struct sockaddr_atmsvc *svc)
|
||
|
|
{
|
||
|
|
sigd_enq2(vcc, type, listen_vcc, pvc, svc, vcc ? &vcc->qos : NULL, 0);
|
||
|
|
/* other ISP applications may use "reply" */
|
||
|
|
}
|
||
|
|
|
||
|
|
static void purge_vcc(struct atm_vcc *vcc)
|
||
|
|
{
|
||
|
|
if (sk_atm(vcc)->sk_family == PF_ATMSVC &&
|
||
|
|
!test_bit(ATM_VF_META, &vcc->flags)) {
|
||
|
|
set_bit(ATM_VF_RELEASED, &vcc->flags);
|
||
|
|
clear_bit(ATM_VF_REGIS, &vcc->flags);
|
||
|
|
vcc_release_async(vcc, -EUNATCH);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static void sigd_close(struct atm_vcc *vcc)
|
||
|
|
{
|
||
|
|
struct sock *s;
|
||
|
|
int i;
|
||
|
|
|
||
|
|
pr_debug("\n");
|
||
|
|
sigd = NULL;
|
||
|
|
if (skb_peek(&sk_atm(vcc)->sk_receive_queue))
|
||
|
|
pr_err("closing with requests pending\n");
|
||
|
|
skb_queue_purge(&sk_atm(vcc)->sk_receive_queue);
|
||
|
|
|
||
|
|
read_lock(&vcc_sklist_lock);
|
||
|
|
for (i = 0; i < VCC_HTABLE_SIZE; ++i) {
|
||
|
|
struct hlist_head *head = &vcc_hash[i];
|
||
|
|
|
||
|
|
sk_for_each(s, head) {
|
||
|
|
vcc = atm_sk(s);
|
||
|
|
|
||
|
|
purge_vcc(vcc);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
read_unlock(&vcc_sklist_lock);
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct atmdev_ops sigd_dev_ops = {
|
||
|
|
.close = sigd_close,
|
||
|
|
.send = sigd_send
|
||
|
|
};
|
||
|
|
|
||
|
|
static struct atm_dev sigd_dev = {
|
||
|
|
.ops = &sigd_dev_ops,
|
||
|
|
.type = "sig",
|
||
|
|
.number = 999,
|
||
|
|
.lock = __SPIN_LOCK_UNLOCKED(sigd_dev.lock)
|
||
|
|
};
|
||
|
|
|
||
|
|
int sigd_attach(struct atm_vcc *vcc)
|
||
|
|
{
|
||
|
|
if (sigd)
|
||
|
|
return -EADDRINUSE;
|
||
|
|
pr_debug("\n");
|
||
|
|
sigd = vcc;
|
||
|
|
vcc->dev = &sigd_dev;
|
||
|
|
vcc_insert_socket(sk_atm(vcc));
|
||
|
|
set_bit(ATM_VF_META, &vcc->flags);
|
||
|
|
set_bit(ATM_VF_READY, &vcc->flags);
|
||
|
|
return 0;
|
||
|
|
}
|