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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /net/atm/signaling.c
downloadlinux-stericsson-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'net/atm/signaling.c')
-rw-r--r--net/atm/signaling.c280
1 files changed, 280 insertions, 0 deletions
diff --git a/net/atm/signaling.c b/net/atm/signaling.c
new file mode 100644
index 000000000000..6ff803154c04
--- /dev/null
+++ b/net/atm/signaling.c
@@ -0,0 +1,280 @@
+/* net/atm/signaling.c - ATM signaling */
+
+/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
+
+
+#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 "resources.h"
+#include "signaling.h"
+
+
+#undef WAIT_FOR_DEMON /* #define this if system calls on SVC sockets
+ should block until the demon runs.
+ Danger: may cause nasty hangs if the demon
+ crashes. */
+
+#if 0
+#define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
+#else
+#define DPRINTK(format,args...)
+#endif
+
+
+struct atm_vcc *sigd = NULL;
+#ifdef WAIT_FOR_DEMON
+static DECLARE_WAIT_QUEUE_HEAD(sigd_sleep);
+#endif
+
+
+static void sigd_put_skb(struct sk_buff *skb)
+{
+#ifdef WAIT_FOR_DEMON
+ static unsigned long silence;
+ DECLARE_WAITQUEUE(wait,current);
+
+ add_wait_queue(&sigd_sleep,&wait);
+ while (!sigd) {
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ if (time_after(jiffies, silence) || silence == 0) {
+ printk(KERN_INFO "atmsvc: waiting for signaling demon "
+ "...\n");
+ silence = (jiffies+30*HZ)|1;
+ }
+ schedule();
+ }
+ current->state = TASK_RUNNING;
+ remove_wait_queue(&sigd_sleep,&wait);
+#else
+ if (!sigd) {
+ printk(KERN_WARNING "atmsvc: no signaling demon\n");
+ kfree_skb(skb);
+ return;
+ }
+#endif
+ 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), skb->len);
+}
+
+
+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;
+ atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
+ DPRINTK("sigd_send %d (0x%lx)\n",(int) msg->type,
+ (unsigned long) msg->vcc);
+ vcc = *(struct atm_vcc **) &msg->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;
+ DPRINTK("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);
+ DPRINTK("waking sk->sk_sleep 0x%p\n", sk->sk_sleep);
+ 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:
+ printk(KERN_ALERT "sigd_send: 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 session = 0;
+
+ DPRINTK("sigd_enq %d (0x%p)\n",(int) type,vcc);
+ while (!(skb = alloc_skb(sizeof(struct atmsvc_msg),GFP_KERNEL)))
+ schedule();
+ msg = (struct atmsvc_msg *) skb_put(skb,sizeof(struct atmsvc_msg));
+ memset(msg,0,sizeof(*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);
+ vcc_release_async(vcc, -EUNATCH);
+ }
+}
+
+
+static void sigd_close(struct atm_vcc *vcc)
+{
+ struct hlist_node *node;
+ struct sock *s;
+ int i;
+
+ DPRINTK("sigd_close\n");
+ sigd = NULL;
+ if (skb_peek(&sk_atm(vcc)->sk_receive_queue))
+ printk(KERN_ERR "sigd_close: 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, node, head) {
+ struct atm_vcc *vcc = atm_sk(s);
+
+ if (vcc->dev)
+ purge_vcc(vcc);
+ }
+ }
+ read_unlock(&vcc_sklist_lock);
+}
+
+
+static 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
+};
+
+
+int sigd_attach(struct atm_vcc *vcc)
+{
+ if (sigd) return -EADDRINUSE;
+ DPRINTK("sigd_attach\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);
+#ifdef WAIT_FOR_DEMON
+ wake_up(&sigd_sleep);
+#endif
+ return 0;
+}