270 lines
6.9 KiB
C
270 lines
6.9 KiB
C
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/* net/atm/signaling.c - ATM signaling */
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/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
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#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
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#include <linux/errno.h> /* error codes */
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#include <linux/kernel.h> /* printk */
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#include <linux/skbuff.h>
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#include <linux/wait.h>
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#include <linux/sched.h> /* jiffies and HZ */
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#include <linux/atm.h> /* ATM stuff */
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#include <linux/atmsap.h>
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#include <linux/atmsvc.h>
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#include <linux/atmdev.h>
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#include <linux/bitops.h>
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#include <linux/slab.h>
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#include "resources.h"
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#include "signaling.h"
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#undef WAIT_FOR_DEMON /* #define this if system calls on SVC sockets
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should block until the demon runs.
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Danger: may cause nasty hangs if the demon
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crashes. */
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struct atm_vcc *sigd = NULL;
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#ifdef WAIT_FOR_DEMON
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static DECLARE_WAIT_QUEUE_HEAD(sigd_sleep);
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#endif
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static void sigd_put_skb(struct sk_buff *skb)
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{
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#ifdef WAIT_FOR_DEMON
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DECLARE_WAITQUEUE(wait, current);
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add_wait_queue(&sigd_sleep, &wait);
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while (!sigd) {
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set_current_state(TASK_UNINTERRUPTIBLE);
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pr_debug("atmsvc: waiting for signaling daemon...\n");
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schedule();
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}
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current->state = TASK_RUNNING;
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remove_wait_queue(&sigd_sleep, &wait);
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#else
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if (!sigd) {
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pr_debug("atmsvc: no signaling daemon\n");
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kfree_skb(skb);
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return;
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}
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#endif
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atm_force_charge(sigd, skb->truesize);
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skb_queue_tail(&sk_atm(sigd)->sk_receive_queue, skb);
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sk_atm(sigd)->sk_data_ready(sk_atm(sigd), skb->len);
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}
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static void modify_qos(struct atm_vcc *vcc, struct atmsvc_msg *msg)
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{
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struct sk_buff *skb;
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if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
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!test_bit(ATM_VF_READY, &vcc->flags))
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return;
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msg->type = as_error;
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if (!vcc->dev->ops->change_qos)
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msg->reply = -EOPNOTSUPP;
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else {
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/* should lock VCC */
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msg->reply = vcc->dev->ops->change_qos(vcc, &msg->qos,
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msg->reply);
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if (!msg->reply)
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msg->type = as_okay;
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}
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/*
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* Should probably just turn around the old skb. But the, the buffer
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* space accounting needs to follow the change too. Maybe later.
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*/
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while (!(skb = alloc_skb(sizeof(struct atmsvc_msg), GFP_KERNEL)))
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schedule();
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*(struct atmsvc_msg *)skb_put(skb, sizeof(struct atmsvc_msg)) = *msg;
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sigd_put_skb(skb);
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}
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static int sigd_send(struct atm_vcc *vcc, struct sk_buff *skb)
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{
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struct atmsvc_msg *msg;
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struct atm_vcc *session_vcc;
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struct sock *sk;
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msg = (struct atmsvc_msg *) skb->data;
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atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
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vcc = *(struct atm_vcc **) &msg->vcc;
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pr_debug("%d (0x%lx)\n", (int)msg->type, (unsigned long)vcc);
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sk = sk_atm(vcc);
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switch (msg->type) {
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case as_okay:
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sk->sk_err = -msg->reply;
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clear_bit(ATM_VF_WAITING, &vcc->flags);
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if (!*vcc->local.sas_addr.prv && !*vcc->local.sas_addr.pub) {
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vcc->local.sas_family = AF_ATMSVC;
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memcpy(vcc->local.sas_addr.prv,
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msg->local.sas_addr.prv, ATM_ESA_LEN);
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memcpy(vcc->local.sas_addr.pub,
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msg->local.sas_addr.pub, ATM_E164_LEN + 1);
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}
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session_vcc = vcc->session ? vcc->session : vcc;
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if (session_vcc->vpi || session_vcc->vci)
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break;
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session_vcc->itf = msg->pvc.sap_addr.itf;
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session_vcc->vpi = msg->pvc.sap_addr.vpi;
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session_vcc->vci = msg->pvc.sap_addr.vci;
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if (session_vcc->vpi || session_vcc->vci)
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session_vcc->qos = msg->qos;
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break;
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case as_error:
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clear_bit(ATM_VF_REGIS, &vcc->flags);
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clear_bit(ATM_VF_READY, &vcc->flags);
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sk->sk_err = -msg->reply;
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clear_bit(ATM_VF_WAITING, &vcc->flags);
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break;
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case as_indicate:
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vcc = *(struct atm_vcc **)&msg->listen_vcc;
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sk = sk_atm(vcc);
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pr_debug("as_indicate!!!\n");
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lock_sock(sk);
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if (sk_acceptq_is_full(sk)) {
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sigd_enq(NULL, as_reject, vcc, NULL, NULL);
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dev_kfree_skb(skb);
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goto as_indicate_complete;
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}
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sk->sk_ack_backlog++;
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skb_queue_tail(&sk->sk_receive_queue, skb);
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pr_debug("waking sk_sleep(sk) 0x%p\n", sk_sleep(sk));
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sk->sk_state_change(sk);
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as_indicate_complete:
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release_sock(sk);
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return 0;
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case as_close:
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set_bit(ATM_VF_RELEASED, &vcc->flags);
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vcc_release_async(vcc, msg->reply);
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goto out;
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case as_modify:
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modify_qos(vcc, msg);
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break;
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case as_addparty:
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case as_dropparty:
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sk->sk_err_soft = msg->reply;
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/* < 0 failure, otherwise ep_ref */
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clear_bit(ATM_VF_WAITING, &vcc->flags);
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break;
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default:
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pr_alert("bad message type %d\n", (int)msg->type);
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return -EINVAL;
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}
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sk->sk_state_change(sk);
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out:
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dev_kfree_skb(skb);
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return 0;
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}
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void sigd_enq2(struct atm_vcc *vcc, enum atmsvc_msg_type type,
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struct atm_vcc *listen_vcc, const struct sockaddr_atmpvc *pvc,
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const struct sockaddr_atmsvc *svc, const struct atm_qos *qos,
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int reply)
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{
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struct sk_buff *skb;
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struct atmsvc_msg *msg;
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static unsigned session = 0;
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pr_debug("%d (0x%p)\n", (int)type, vcc);
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while (!(skb = alloc_skb(sizeof(struct atmsvc_msg), GFP_KERNEL)))
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schedule();
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msg = (struct atmsvc_msg *)skb_put(skb, sizeof(struct atmsvc_msg));
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memset(msg, 0, sizeof(*msg));
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msg->type = type;
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*(struct atm_vcc **) &msg->vcc = vcc;
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*(struct atm_vcc **) &msg->listen_vcc = listen_vcc;
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msg->reply = reply;
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if (qos)
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msg->qos = *qos;
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if (vcc)
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msg->sap = vcc->sap;
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if (svc)
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msg->svc = *svc;
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if (vcc)
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msg->local = vcc->local;
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if (pvc)
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msg->pvc = *pvc;
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if (vcc) {
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if (type == as_connect && test_bit(ATM_VF_SESSION, &vcc->flags))
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msg->session = ++session;
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/* every new pmp connect gets the next session number */
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}
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sigd_put_skb(skb);
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if (vcc)
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set_bit(ATM_VF_REGIS, &vcc->flags);
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}
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void sigd_enq(struct atm_vcc *vcc, enum atmsvc_msg_type type,
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struct atm_vcc *listen_vcc, const struct sockaddr_atmpvc *pvc,
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const struct sockaddr_atmsvc *svc)
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{
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sigd_enq2(vcc, type, listen_vcc, pvc, svc, vcc ? &vcc->qos : NULL, 0);
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/* other ISP applications may use "reply" */
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}
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static void purge_vcc(struct atm_vcc *vcc)
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{
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if (sk_atm(vcc)->sk_family == PF_ATMSVC &&
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!test_bit(ATM_VF_META, &vcc->flags)) {
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set_bit(ATM_VF_RELEASED, &vcc->flags);
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clear_bit(ATM_VF_REGIS, &vcc->flags);
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vcc_release_async(vcc, -EUNATCH);
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}
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}
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static void sigd_close(struct atm_vcc *vcc)
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{
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struct hlist_node *node;
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struct sock *s;
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int i;
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pr_debug("\n");
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sigd = NULL;
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if (skb_peek(&sk_atm(vcc)->sk_receive_queue))
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pr_err("closing with requests pending\n");
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skb_queue_purge(&sk_atm(vcc)->sk_receive_queue);
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read_lock(&vcc_sklist_lock);
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for (i = 0; i < VCC_HTABLE_SIZE; ++i) {
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struct hlist_head *head = &vcc_hash[i];
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sk_for_each(s, node, head) {
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vcc = atm_sk(s);
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purge_vcc(vcc);
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}
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}
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read_unlock(&vcc_sklist_lock);
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}
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static struct atmdev_ops sigd_dev_ops = {
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.close = sigd_close,
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.send = sigd_send
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};
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static struct atm_dev sigd_dev = {
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.ops = &sigd_dev_ops,
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.type = "sig",
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.number = 999,
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.lock = __SPIN_LOCK_UNLOCKED(sigd_dev.lock)
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};
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int sigd_attach(struct atm_vcc *vcc)
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{
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if (sigd)
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return -EADDRINUSE;
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pr_debug("\n");
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sigd = vcc;
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vcc->dev = &sigd_dev;
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vcc_insert_socket(sk_atm(vcc));
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set_bit(ATM_VF_META, &vcc->flags);
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set_bit(ATM_VF_READY, &vcc->flags);
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#ifdef WAIT_FOR_DEMON
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wake_up(&sigd_sleep);
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#endif
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return 0;
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}
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