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Diffstat (limited to 'drivers/isdn/i4l/isdn_x25iface.c')
-rw-r--r--drivers/isdn/i4l/isdn_x25iface.c332
1 files changed, 0 insertions, 332 deletions
diff --git a/drivers/isdn/i4l/isdn_x25iface.c b/drivers/isdn/i4l/isdn_x25iface.c
deleted file mode 100644
index 48bfbcb4a09d..000000000000
--- a/drivers/isdn/i4l/isdn_x25iface.c
+++ /dev/null
@@ -1,332 +0,0 @@
-/* $Id: isdn_x25iface.c,v 1.1.2.2 2004/01/12 22:37:19 keil Exp $
- *
- * Linux ISDN subsystem, X.25 related functions
- *
- * This software may be used and distributed according to the terms
- * of the GNU General Public License, incorporated herein by reference.
- *
- * stuff needed to support the Linux X.25 PLP code on top of devices that
- * can provide a lab_b service using the concap_proto mechanism.
- * This module supports a network interface which provides lapb_sematics
- * -- as defined in Documentation/networking/x25-iface.txt -- to
- * the upper layer and assumes that the lower layer provides a reliable
- * data link service by means of the concap_device_ops callbacks.
- *
- * Only protocol specific stuff goes here. Device specific stuff
- * goes to another -- device related -- concap_proto support source file.
- *
- */
-
-/* #include <linux/isdn.h> */
-#include <linux/netdevice.h>
-#include <linux/concap.h>
-#include <linux/slab.h>
-#include <linux/wanrouter.h>
-#include <net/x25device.h>
-#include "isdn_x25iface.h"
-
-/* for debugging messages not to cause an oops when device pointer is NULL*/
-#define MY_DEVNAME(dev) ((dev) ? (dev)->name : "DEVICE UNSPECIFIED")
-
-
-typedef struct isdn_x25iface_proto_data {
- int magic;
- enum wan_states state;
- /* Private stuff, not to be accessed via proto_data. We provide the
- other storage for the concap_proto instance here as well,
- enabling us to allocate both with just one kmalloc(): */
- struct concap_proto priv;
-} ix25_pdata_t;
-
-
-
-/* is now in header file (extern): struct concap_proto * isdn_x25iface_proto_new(void); */
-static void isdn_x25iface_proto_del(struct concap_proto *);
-static int isdn_x25iface_proto_close(struct concap_proto *);
-static int isdn_x25iface_proto_restart(struct concap_proto *,
- struct net_device *,
- struct concap_device_ops *);
-static int isdn_x25iface_xmit(struct concap_proto *, struct sk_buff *);
-static int isdn_x25iface_receive(struct concap_proto *, struct sk_buff *);
-static int isdn_x25iface_connect_ind(struct concap_proto *);
-static int isdn_x25iface_disconn_ind(struct concap_proto *);
-
-
-static struct concap_proto_ops ix25_pops = {
- .proto_new = &isdn_x25iface_proto_new,
- .proto_del = &isdn_x25iface_proto_del,
- .restart = &isdn_x25iface_proto_restart,
- .close = &isdn_x25iface_proto_close,
- .encap_and_xmit = &isdn_x25iface_xmit,
- .data_ind = &isdn_x25iface_receive,
- .connect_ind = &isdn_x25iface_connect_ind,
- .disconn_ind = &isdn_x25iface_disconn_ind
-};
-
-/* error message helper function */
-static void illegal_state_warn(unsigned state, unsigned char firstbyte)
-{
- printk(KERN_WARNING "isdn_x25iface: firstbyte %x illegal in"
- "current state %d\n", firstbyte, state);
-}
-
-/* check protocol data field for consistency */
-static int pdata_is_bad(ix25_pdata_t *pda) {
-
- if (pda && pda->magic == ISDN_X25IFACE_MAGIC) return 0;
- printk(KERN_WARNING
- "isdn_x25iface_xxx: illegal pointer to proto data\n");
- return 1;
-}
-
-/* create a new x25 interface protocol instance
- */
-struct concap_proto *isdn_x25iface_proto_new(void)
-{
- ix25_pdata_t *tmp = kmalloc(sizeof(ix25_pdata_t), GFP_KERNEL);
- IX25DEBUG("isdn_x25iface_proto_new\n");
- if (tmp) {
- tmp->magic = ISDN_X25IFACE_MAGIC;
- tmp->state = WAN_UNCONFIGURED;
- /* private data space used to hold the concap_proto data.
- Only to be accessed via the returned pointer */
- spin_lock_init(&tmp->priv.lock);
- tmp->priv.dops = NULL;
- tmp->priv.net_dev = NULL;
- tmp->priv.pops = &ix25_pops;
- tmp->priv.flags = 0;
- tmp->priv.proto_data = tmp;
- return (&(tmp->priv));
- }
- return NULL;
-};
-
-/* close the x25iface encapsulation protocol
- */
-static int isdn_x25iface_proto_close(struct concap_proto *cprot) {
-
- ix25_pdata_t *tmp;
- int ret = 0;
- ulong flags;
-
- if (!cprot) {
- printk(KERN_ERR "isdn_x25iface_proto_close: "
- "invalid concap_proto pointer\n");
- return -1;
- }
- IX25DEBUG("isdn_x25iface_proto_close %s \n", MY_DEVNAME(cprot->net_dev));
- spin_lock_irqsave(&cprot->lock, flags);
- cprot->dops = NULL;
- cprot->net_dev = NULL;
- tmp = cprot->proto_data;
- if (pdata_is_bad(tmp)) {
- ret = -1;
- } else {
- tmp->state = WAN_UNCONFIGURED;
- }
- spin_unlock_irqrestore(&cprot->lock, flags);
- return ret;
-}
-
-/* Delete the x25iface encapsulation protocol instance
- */
-static void isdn_x25iface_proto_del(struct concap_proto *cprot) {
-
- ix25_pdata_t *tmp;
-
- IX25DEBUG("isdn_x25iface_proto_del \n");
- if (!cprot) {
- printk(KERN_ERR "isdn_x25iface_proto_del: "
- "concap_proto pointer is NULL\n");
- return;
- }
- tmp = cprot->proto_data;
- if (tmp == NULL) {
- printk(KERN_ERR "isdn_x25iface_proto_del: inconsistent "
- "proto_data pointer (maybe already deleted?)\n");
- return;
- }
- /* close if the protocol is still open */
- if (cprot->dops) isdn_x25iface_proto_close(cprot);
- /* freeing the storage should be sufficient now. But some additional
- settings might help to catch wild pointer bugs */
- tmp->magic = 0;
- cprot->proto_data = NULL;
-
- kfree(tmp);
- return;
-}
-
-/* (re-)initialize the data structures for x25iface encapsulation
- */
-static int isdn_x25iface_proto_restart(struct concap_proto *cprot,
- struct net_device *ndev,
- struct concap_device_ops *dops)
-{
- ix25_pdata_t *pda = cprot->proto_data;
- ulong flags;
-
- IX25DEBUG("isdn_x25iface_proto_restart %s \n", MY_DEVNAME(ndev));
-
- if (pdata_is_bad(pda)) return -1;
-
- if (!(dops && dops->data_req && dops->connect_req
- && dops->disconn_req)) {
- printk(KERN_WARNING "isdn_x25iface_restart: required dops"
- " missing\n");
- isdn_x25iface_proto_close(cprot);
- return -1;
- }
- spin_lock_irqsave(&cprot->lock, flags);
- cprot->net_dev = ndev;
- cprot->pops = &ix25_pops;
- cprot->dops = dops;
- pda->state = WAN_DISCONNECTED;
- spin_unlock_irqrestore(&cprot->lock, flags);
- return 0;
-}
-
-/* deliver a dl_data frame received from i4l HL driver to the network layer
- */
-static int isdn_x25iface_receive(struct concap_proto *cprot, struct sk_buff *skb)
-{
- IX25DEBUG("isdn_x25iface_receive %s \n", MY_DEVNAME(cprot->net_dev));
- if (((ix25_pdata_t *)(cprot->proto_data))
- ->state == WAN_CONNECTED) {
- if (skb_push(skb, 1)) {
- skb->data[0] = X25_IFACE_DATA;
- skb->protocol = x25_type_trans(skb, cprot->net_dev);
- netif_rx(skb);
- return 0;
- }
- }
- printk(KERN_WARNING "isdn_x25iface_receive %s: not connected, skb dropped\n", MY_DEVNAME(cprot->net_dev));
- dev_kfree_skb(skb);
- return -1;
-}
-
-/* a connection set up is indicated by lower layer
- */
-static int isdn_x25iface_connect_ind(struct concap_proto *cprot)
-{
- struct sk_buff *skb;
- enum wan_states *state_p
- = &(((ix25_pdata_t *)(cprot->proto_data))->state);
- IX25DEBUG("isdn_x25iface_connect_ind %s \n"
- , MY_DEVNAME(cprot->net_dev));
- if (*state_p == WAN_UNCONFIGURED) {
- printk(KERN_WARNING
- "isdn_x25iface_connect_ind while unconfigured %s\n"
- , MY_DEVNAME(cprot->net_dev));
- return -1;
- }
- *state_p = WAN_CONNECTED;
-
- skb = dev_alloc_skb(1);
- if (skb) {
- skb_put_u8(skb, X25_IFACE_CONNECT);
- skb->protocol = x25_type_trans(skb, cprot->net_dev);
- netif_rx(skb);
- return 0;
- } else {
- printk(KERN_WARNING "isdn_x25iface_connect_ind: "
- " out of memory -- disconnecting\n");
- cprot->dops->disconn_req(cprot);
- return -1;
- }
-}
-
-/* a disconnect is indicated by lower layer
- */
-static int isdn_x25iface_disconn_ind(struct concap_proto *cprot)
-{
- struct sk_buff *skb;
- enum wan_states *state_p
- = &(((ix25_pdata_t *)(cprot->proto_data))->state);
- IX25DEBUG("isdn_x25iface_disconn_ind %s \n", MY_DEVNAME(cprot->net_dev));
- if (*state_p == WAN_UNCONFIGURED) {
- printk(KERN_WARNING
- "isdn_x25iface_disconn_ind while unconfigured\n");
- return -1;
- }
- if (!cprot->net_dev) return -1;
- *state_p = WAN_DISCONNECTED;
- skb = dev_alloc_skb(1);
- if (skb) {
- skb_put_u8(skb, X25_IFACE_DISCONNECT);
- skb->protocol = x25_type_trans(skb, cprot->net_dev);
- netif_rx(skb);
- return 0;
- } else {
- printk(KERN_WARNING "isdn_x25iface_disconn_ind:"
- " out of memory\n");
- return -1;
- }
-}
-
-/* process a frame handed over to us from linux network layer. First byte
- semantics as defined in Documentation/networking/x25-iface.txt
-*/
-static int isdn_x25iface_xmit(struct concap_proto *cprot, struct sk_buff *skb)
-{
- unsigned char firstbyte = skb->data[0];
- enum wan_states *state = &((ix25_pdata_t *)cprot->proto_data)->state;
- int ret = 0;
- IX25DEBUG("isdn_x25iface_xmit: %s first=%x state=%d\n",
- MY_DEVNAME(cprot->net_dev), firstbyte, *state);
- switch (firstbyte) {
- case X25_IFACE_DATA:
- if (*state == WAN_CONNECTED) {
- skb_pull(skb, 1);
- netif_trans_update(cprot->net_dev);
- ret = (cprot->dops->data_req(cprot, skb));
- /* prepare for future retransmissions */
- if (ret) skb_push(skb, 1);
- return ret;
- }
- illegal_state_warn(*state, firstbyte);
- break;
- case X25_IFACE_CONNECT:
- if (*state == WAN_DISCONNECTED) {
- *state = WAN_CONNECTING;
- ret = cprot->dops->connect_req(cprot);
- if (ret) {
- /* reset state and notify upper layer about
- * immidiatly failed attempts */
- isdn_x25iface_disconn_ind(cprot);
- }
- } else {
- illegal_state_warn(*state, firstbyte);
- }
- break;
- case X25_IFACE_DISCONNECT:
- switch (*state) {
- case WAN_DISCONNECTED:
- /* Should not happen. However, give upper layer a
- chance to recover from inconstistency but don't
- trust the lower layer sending the disconn_confirm
- when already disconnected */
- printk(KERN_WARNING "isdn_x25iface_xmit: disconnect "
- " requested while disconnected\n");
- isdn_x25iface_disconn_ind(cprot);
- break; /* prevent infinite loops */
- case WAN_CONNECTING:
- case WAN_CONNECTED:
- *state = WAN_DISCONNECTED;
- cprot->dops->disconn_req(cprot);
- break;
- default:
- illegal_state_warn(*state, firstbyte);
- }
- break;
- case X25_IFACE_PARAMS:
- printk(KERN_WARNING "isdn_x25iface_xmit: setting of lapb"
- " options not yet supported\n");
- break;
- default:
- printk(KERN_WARNING "isdn_x25iface_xmit: frame with illegal"
- " first byte %x ignored:\n", firstbyte);
- }
- dev_kfree_skb(skb);
- return 0;
-}