| /* 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 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); |