mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-23 08:56:59 +07:00
46c4b7a569
Make these structures const as they are either passed to the function atm_dev_register having the corresponding argument as const or stored in the ops field of a atm_dev structure, which is also const. Done using Coccinelle. Signed-off-by: Bhumika Goyal <bhumirks@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
493 lines
11 KiB
C
493 lines
11 KiB
C
/* drivers/atm/atmtcp.c - ATM over TCP "device" driver */
|
|
|
|
/* Written 1997-2000 by Werner Almesberger, EPFL LRC/ICA */
|
|
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/wait.h>
|
|
#include <linux/atmdev.h>
|
|
#include <linux/atm_tcp.h>
|
|
#include <linux/bitops.h>
|
|
#include <linux/init.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/uaccess.h>
|
|
#include <linux/atomic.h>
|
|
|
|
|
|
extern int atm_init_aal5(struct atm_vcc *vcc); /* "raw" AAL5 transport */
|
|
|
|
|
|
#define PRIV(dev) ((struct atmtcp_dev_data *) ((dev)->dev_data))
|
|
|
|
|
|
struct atmtcp_dev_data {
|
|
struct atm_vcc *vcc; /* control VCC; NULL if detached */
|
|
int persist; /* non-zero if persistent */
|
|
};
|
|
|
|
|
|
#define DEV_LABEL "atmtcp"
|
|
|
|
#define MAX_VPI_BITS 8 /* simplifies life */
|
|
#define MAX_VCI_BITS 16
|
|
|
|
|
|
/*
|
|
* Hairy code ahead: the control VCC may be closed while we're still
|
|
* waiting for an answer, so we need to re-validate out_vcc every once
|
|
* in a while.
|
|
*/
|
|
|
|
|
|
static int atmtcp_send_control(struct atm_vcc *vcc,int type,
|
|
const struct atmtcp_control *msg,int flag)
|
|
{
|
|
DECLARE_WAITQUEUE(wait,current);
|
|
struct atm_vcc *out_vcc;
|
|
struct sk_buff *skb;
|
|
struct atmtcp_control *new_msg;
|
|
int old_test;
|
|
int error = 0;
|
|
|
|
out_vcc = PRIV(vcc->dev) ? PRIV(vcc->dev)->vcc : NULL;
|
|
if (!out_vcc) return -EUNATCH;
|
|
skb = alloc_skb(sizeof(*msg),GFP_KERNEL);
|
|
if (!skb) return -ENOMEM;
|
|
mb();
|
|
out_vcc = PRIV(vcc->dev) ? PRIV(vcc->dev)->vcc : NULL;
|
|
if (!out_vcc) {
|
|
dev_kfree_skb(skb);
|
|
return -EUNATCH;
|
|
}
|
|
atm_force_charge(out_vcc,skb->truesize);
|
|
new_msg = skb_put(skb, sizeof(*new_msg));
|
|
*new_msg = *msg;
|
|
new_msg->hdr.length = ATMTCP_HDR_MAGIC;
|
|
new_msg->type = type;
|
|
memset(&new_msg->vcc,0,sizeof(atm_kptr_t));
|
|
*(struct atm_vcc **) &new_msg->vcc = vcc;
|
|
old_test = test_bit(flag,&vcc->flags);
|
|
out_vcc->push(out_vcc,skb);
|
|
add_wait_queue(sk_sleep(sk_atm(vcc)), &wait);
|
|
while (test_bit(flag,&vcc->flags) == old_test) {
|
|
mb();
|
|
out_vcc = PRIV(vcc->dev) ? PRIV(vcc->dev)->vcc : NULL;
|
|
if (!out_vcc) {
|
|
error = -EUNATCH;
|
|
break;
|
|
}
|
|
set_current_state(TASK_UNINTERRUPTIBLE);
|
|
schedule();
|
|
}
|
|
set_current_state(TASK_RUNNING);
|
|
remove_wait_queue(sk_sleep(sk_atm(vcc)), &wait);
|
|
return error;
|
|
}
|
|
|
|
|
|
static int atmtcp_recv_control(const struct atmtcp_control *msg)
|
|
{
|
|
struct atm_vcc *vcc = *(struct atm_vcc **) &msg->vcc;
|
|
|
|
vcc->vpi = msg->addr.sap_addr.vpi;
|
|
vcc->vci = msg->addr.sap_addr.vci;
|
|
vcc->qos = msg->qos;
|
|
sk_atm(vcc)->sk_err = -msg->result;
|
|
switch (msg->type) {
|
|
case ATMTCP_CTRL_OPEN:
|
|
change_bit(ATM_VF_READY,&vcc->flags);
|
|
break;
|
|
case ATMTCP_CTRL_CLOSE:
|
|
change_bit(ATM_VF_ADDR,&vcc->flags);
|
|
break;
|
|
default:
|
|
printk(KERN_ERR "atmtcp_recv_control: unknown type %d\n",
|
|
msg->type);
|
|
return -EINVAL;
|
|
}
|
|
wake_up(sk_sleep(sk_atm(vcc)));
|
|
return 0;
|
|
}
|
|
|
|
|
|
static void atmtcp_v_dev_close(struct atm_dev *dev)
|
|
{
|
|
/* Nothing.... Isn't this simple :-) -- REW */
|
|
}
|
|
|
|
|
|
static int atmtcp_v_open(struct atm_vcc *vcc)
|
|
{
|
|
struct atmtcp_control msg;
|
|
int error;
|
|
short vpi = vcc->vpi;
|
|
int vci = vcc->vci;
|
|
|
|
memset(&msg,0,sizeof(msg));
|
|
msg.addr.sap_family = AF_ATMPVC;
|
|
msg.hdr.vpi = htons(vpi);
|
|
msg.addr.sap_addr.vpi = vpi;
|
|
msg.hdr.vci = htons(vci);
|
|
msg.addr.sap_addr.vci = vci;
|
|
if (vpi == ATM_VPI_UNSPEC || vci == ATM_VCI_UNSPEC) return 0;
|
|
msg.type = ATMTCP_CTRL_OPEN;
|
|
msg.qos = vcc->qos;
|
|
set_bit(ATM_VF_ADDR,&vcc->flags);
|
|
clear_bit(ATM_VF_READY,&vcc->flags); /* just in case ... */
|
|
error = atmtcp_send_control(vcc,ATMTCP_CTRL_OPEN,&msg,ATM_VF_READY);
|
|
if (error) return error;
|
|
return -sk_atm(vcc)->sk_err;
|
|
}
|
|
|
|
|
|
static void atmtcp_v_close(struct atm_vcc *vcc)
|
|
{
|
|
struct atmtcp_control msg;
|
|
|
|
memset(&msg,0,sizeof(msg));
|
|
msg.addr.sap_family = AF_ATMPVC;
|
|
msg.addr.sap_addr.vpi = vcc->vpi;
|
|
msg.addr.sap_addr.vci = vcc->vci;
|
|
clear_bit(ATM_VF_READY,&vcc->flags);
|
|
(void) atmtcp_send_control(vcc,ATMTCP_CTRL_CLOSE,&msg,ATM_VF_ADDR);
|
|
}
|
|
|
|
|
|
static int atmtcp_v_ioctl(struct atm_dev *dev,unsigned int cmd,void __user *arg)
|
|
{
|
|
struct atm_cirange ci;
|
|
struct atm_vcc *vcc;
|
|
struct sock *s;
|
|
int i;
|
|
|
|
if (cmd != ATM_SETCIRANGE) return -ENOIOCTLCMD;
|
|
if (copy_from_user(&ci, arg,sizeof(ci))) return -EFAULT;
|
|
if (ci.vpi_bits == ATM_CI_MAX) ci.vpi_bits = MAX_VPI_BITS;
|
|
if (ci.vci_bits == ATM_CI_MAX) ci.vci_bits = MAX_VCI_BITS;
|
|
if (ci.vpi_bits > MAX_VPI_BITS || ci.vpi_bits < 0 ||
|
|
ci.vci_bits > MAX_VCI_BITS || ci.vci_bits < 0) return -EINVAL;
|
|
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);
|
|
if (vcc->dev != dev)
|
|
continue;
|
|
if ((vcc->vpi >> ci.vpi_bits) ||
|
|
(vcc->vci >> ci.vci_bits)) {
|
|
read_unlock(&vcc_sklist_lock);
|
|
return -EBUSY;
|
|
}
|
|
}
|
|
}
|
|
read_unlock(&vcc_sklist_lock);
|
|
dev->ci_range = ci;
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int atmtcp_v_send(struct atm_vcc *vcc,struct sk_buff *skb)
|
|
{
|
|
struct atmtcp_dev_data *dev_data;
|
|
struct atm_vcc *out_vcc=NULL; /* Initializer quietens GCC warning */
|
|
struct sk_buff *new_skb;
|
|
struct atmtcp_hdr *hdr;
|
|
int size;
|
|
|
|
if (vcc->qos.txtp.traffic_class == ATM_NONE) {
|
|
if (vcc->pop) vcc->pop(vcc,skb);
|
|
else dev_kfree_skb(skb);
|
|
return -EINVAL;
|
|
}
|
|
dev_data = PRIV(vcc->dev);
|
|
if (dev_data) out_vcc = dev_data->vcc;
|
|
if (!dev_data || !out_vcc) {
|
|
if (vcc->pop) vcc->pop(vcc,skb);
|
|
else dev_kfree_skb(skb);
|
|
if (dev_data) return 0;
|
|
atomic_inc(&vcc->stats->tx_err);
|
|
return -ENOLINK;
|
|
}
|
|
size = skb->len+sizeof(struct atmtcp_hdr);
|
|
new_skb = atm_alloc_charge(out_vcc,size,GFP_ATOMIC);
|
|
if (!new_skb) {
|
|
if (vcc->pop) vcc->pop(vcc,skb);
|
|
else dev_kfree_skb(skb);
|
|
atomic_inc(&vcc->stats->tx_err);
|
|
return -ENOBUFS;
|
|
}
|
|
hdr = skb_put(new_skb, sizeof(struct atmtcp_hdr));
|
|
hdr->vpi = htons(vcc->vpi);
|
|
hdr->vci = htons(vcc->vci);
|
|
hdr->length = htonl(skb->len);
|
|
skb_copy_from_linear_data(skb, skb_put(new_skb, skb->len), skb->len);
|
|
if (vcc->pop) vcc->pop(vcc,skb);
|
|
else dev_kfree_skb(skb);
|
|
out_vcc->push(out_vcc,new_skb);
|
|
atomic_inc(&vcc->stats->tx);
|
|
atomic_inc(&out_vcc->stats->rx);
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int atmtcp_v_proc(struct atm_dev *dev,loff_t *pos,char *page)
|
|
{
|
|
struct atmtcp_dev_data *dev_data = PRIV(dev);
|
|
|
|
if (*pos) return 0;
|
|
if (!dev_data->persist) return sprintf(page,"ephemeral\n");
|
|
return sprintf(page,"persistent, %sconnected\n",
|
|
dev_data->vcc ? "" : "dis");
|
|
}
|
|
|
|
|
|
static void atmtcp_c_close(struct atm_vcc *vcc)
|
|
{
|
|
struct atm_dev *atmtcp_dev;
|
|
struct atmtcp_dev_data *dev_data;
|
|
|
|
atmtcp_dev = (struct atm_dev *) vcc->dev_data;
|
|
dev_data = PRIV(atmtcp_dev);
|
|
dev_data->vcc = NULL;
|
|
if (dev_data->persist) return;
|
|
atmtcp_dev->dev_data = NULL;
|
|
kfree(dev_data);
|
|
atm_dev_deregister(atmtcp_dev);
|
|
vcc->dev_data = NULL;
|
|
module_put(THIS_MODULE);
|
|
}
|
|
|
|
|
|
static struct atm_vcc *find_vcc(struct atm_dev *dev, short vpi, int vci)
|
|
{
|
|
struct hlist_head *head;
|
|
struct atm_vcc *vcc;
|
|
struct sock *s;
|
|
|
|
head = &vcc_hash[vci & (VCC_HTABLE_SIZE -1)];
|
|
|
|
sk_for_each(s, head) {
|
|
vcc = atm_sk(s);
|
|
if (vcc->dev == dev &&
|
|
vcc->vci == vci && vcc->vpi == vpi &&
|
|
vcc->qos.rxtp.traffic_class != ATM_NONE) {
|
|
return vcc;
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
|
|
static int atmtcp_c_send(struct atm_vcc *vcc,struct sk_buff *skb)
|
|
{
|
|
struct atm_dev *dev;
|
|
struct atmtcp_hdr *hdr;
|
|
struct atm_vcc *out_vcc;
|
|
struct sk_buff *new_skb;
|
|
int result = 0;
|
|
|
|
if (!skb->len) return 0;
|
|
dev = vcc->dev_data;
|
|
hdr = (struct atmtcp_hdr *) skb->data;
|
|
if (hdr->length == ATMTCP_HDR_MAGIC) {
|
|
result = atmtcp_recv_control(
|
|
(struct atmtcp_control *) skb->data);
|
|
goto done;
|
|
}
|
|
read_lock(&vcc_sklist_lock);
|
|
out_vcc = find_vcc(dev, ntohs(hdr->vpi), ntohs(hdr->vci));
|
|
read_unlock(&vcc_sklist_lock);
|
|
if (!out_vcc) {
|
|
result = -EUNATCH;
|
|
atomic_inc(&vcc->stats->tx_err);
|
|
goto done;
|
|
}
|
|
skb_pull(skb,sizeof(struct atmtcp_hdr));
|
|
new_skb = atm_alloc_charge(out_vcc,skb->len,GFP_KERNEL);
|
|
if (!new_skb) {
|
|
result = -ENOBUFS;
|
|
goto done;
|
|
}
|
|
__net_timestamp(new_skb);
|
|
skb_copy_from_linear_data(skb, skb_put(new_skb, skb->len), skb->len);
|
|
out_vcc->push(out_vcc,new_skb);
|
|
atomic_inc(&vcc->stats->tx);
|
|
atomic_inc(&out_vcc->stats->rx);
|
|
done:
|
|
if (vcc->pop) vcc->pop(vcc,skb);
|
|
else dev_kfree_skb(skb);
|
|
return result;
|
|
}
|
|
|
|
|
|
/*
|
|
* Device operations for the virtual ATM devices created by ATMTCP.
|
|
*/
|
|
|
|
|
|
static struct atmdev_ops atmtcp_v_dev_ops = {
|
|
.dev_close = atmtcp_v_dev_close,
|
|
.open = atmtcp_v_open,
|
|
.close = atmtcp_v_close,
|
|
.ioctl = atmtcp_v_ioctl,
|
|
.send = atmtcp_v_send,
|
|
.proc_read = atmtcp_v_proc,
|
|
.owner = THIS_MODULE
|
|
};
|
|
|
|
|
|
/*
|
|
* Device operations for the ATMTCP control device.
|
|
*/
|
|
|
|
|
|
static const struct atmdev_ops atmtcp_c_dev_ops = {
|
|
.close = atmtcp_c_close,
|
|
.send = atmtcp_c_send
|
|
};
|
|
|
|
|
|
static struct atm_dev atmtcp_control_dev = {
|
|
.ops = &atmtcp_c_dev_ops,
|
|
.type = "atmtcp",
|
|
.number = 999,
|
|
.lock = __SPIN_LOCK_UNLOCKED(atmtcp_control_dev.lock)
|
|
};
|
|
|
|
|
|
static int atmtcp_create(int itf,int persist,struct atm_dev **result)
|
|
{
|
|
struct atmtcp_dev_data *dev_data;
|
|
struct atm_dev *dev;
|
|
|
|
dev_data = kmalloc(sizeof(*dev_data),GFP_KERNEL);
|
|
if (!dev_data)
|
|
return -ENOMEM;
|
|
|
|
dev = atm_dev_register(DEV_LABEL,NULL,&atmtcp_v_dev_ops,itf,NULL);
|
|
if (!dev) {
|
|
kfree(dev_data);
|
|
return itf == -1 ? -ENOMEM : -EBUSY;
|
|
}
|
|
dev->ci_range.vpi_bits = MAX_VPI_BITS;
|
|
dev->ci_range.vci_bits = MAX_VCI_BITS;
|
|
dev->dev_data = dev_data;
|
|
PRIV(dev)->vcc = NULL;
|
|
PRIV(dev)->persist = persist;
|
|
if (result) *result = dev;
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int atmtcp_attach(struct atm_vcc *vcc,int itf)
|
|
{
|
|
struct atm_dev *dev;
|
|
|
|
dev = NULL;
|
|
if (itf != -1) dev = atm_dev_lookup(itf);
|
|
if (dev) {
|
|
if (dev->ops != &atmtcp_v_dev_ops) {
|
|
atm_dev_put(dev);
|
|
return -EMEDIUMTYPE;
|
|
}
|
|
if (PRIV(dev)->vcc) {
|
|
atm_dev_put(dev);
|
|
return -EBUSY;
|
|
}
|
|
}
|
|
else {
|
|
int error;
|
|
|
|
error = atmtcp_create(itf,0,&dev);
|
|
if (error) return error;
|
|
}
|
|
PRIV(dev)->vcc = vcc;
|
|
vcc->dev = &atmtcp_control_dev;
|
|
vcc_insert_socket(sk_atm(vcc));
|
|
set_bit(ATM_VF_META,&vcc->flags);
|
|
set_bit(ATM_VF_READY,&vcc->flags);
|
|
vcc->dev_data = dev;
|
|
(void) atm_init_aal5(vcc); /* @@@ losing AAL in transit ... */
|
|
vcc->stats = &atmtcp_control_dev.stats.aal5;
|
|
return dev->number;
|
|
}
|
|
|
|
|
|
static int atmtcp_create_persistent(int itf)
|
|
{
|
|
return atmtcp_create(itf,1,NULL);
|
|
}
|
|
|
|
|
|
static int atmtcp_remove_persistent(int itf)
|
|
{
|
|
struct atm_dev *dev;
|
|
struct atmtcp_dev_data *dev_data;
|
|
|
|
dev = atm_dev_lookup(itf);
|
|
if (!dev) return -ENODEV;
|
|
if (dev->ops != &atmtcp_v_dev_ops) {
|
|
atm_dev_put(dev);
|
|
return -EMEDIUMTYPE;
|
|
}
|
|
dev_data = PRIV(dev);
|
|
if (!dev_data->persist) return 0;
|
|
dev_data->persist = 0;
|
|
if (PRIV(dev)->vcc) return 0;
|
|
kfree(dev_data);
|
|
atm_dev_put(dev);
|
|
atm_dev_deregister(dev);
|
|
return 0;
|
|
}
|
|
|
|
static int atmtcp_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
|
|
{
|
|
int err = 0;
|
|
struct atm_vcc *vcc = ATM_SD(sock);
|
|
|
|
if (cmd != SIOCSIFATMTCP && cmd != ATMTCP_CREATE && cmd != ATMTCP_REMOVE)
|
|
return -ENOIOCTLCMD;
|
|
|
|
if (!capable(CAP_NET_ADMIN))
|
|
return -EPERM;
|
|
|
|
switch (cmd) {
|
|
case SIOCSIFATMTCP:
|
|
err = atmtcp_attach(vcc, (int) arg);
|
|
if (err >= 0) {
|
|
sock->state = SS_CONNECTED;
|
|
__module_get(THIS_MODULE);
|
|
}
|
|
break;
|
|
case ATMTCP_CREATE:
|
|
err = atmtcp_create_persistent((int) arg);
|
|
break;
|
|
case ATMTCP_REMOVE:
|
|
err = atmtcp_remove_persistent((int) arg);
|
|
break;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static struct atm_ioctl atmtcp_ioctl_ops = {
|
|
.owner = THIS_MODULE,
|
|
.ioctl = atmtcp_ioctl,
|
|
};
|
|
|
|
static __init int atmtcp_init(void)
|
|
{
|
|
register_atm_ioctl(&atmtcp_ioctl_ops);
|
|
return 0;
|
|
}
|
|
|
|
|
|
static void __exit atmtcp_exit(void)
|
|
{
|
|
deregister_atm_ioctl(&atmtcp_ioctl_ops);
|
|
}
|
|
|
|
MODULE_LICENSE("GPL");
|
|
module_init(atmtcp_init);
|
|
module_exit(atmtcp_exit);
|