--- /dev/null
+/* 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 <asm/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 = (struct atmtcp_control *) 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 = (void *) 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 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);
Code Review / kvmfornfv.git / blobdiff