1 /* net/atm/signaling.c - ATM signaling */
3 /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
6 #include <linux/errno.h> /* error codes */
7 #include <linux/kernel.h> /* printk */
8 #include <linux/skbuff.h>
9 #include <linux/wait.h>
10 #include <linux/sched.h> /* jiffies and HZ */
11 #include <linux/atm.h> /* ATM stuff */
12 #include <linux/atmsap.h>
13 #include <linux/atmsvc.h>
14 #include <linux/atmdev.h>
15 #include <linux/bitops.h>
17 #include "resources.h"
18 #include "signaling.h"
21 #undef WAIT_FOR_DEMON /* #define this if system calls on SVC sockets
22 should block until the demon runs.
23 Danger: may cause nasty hangs if the demon
27 #define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
29 #define DPRINTK(format,args...)
33 struct atm_vcc *sigd = NULL;
35 static DECLARE_WAIT_QUEUE_HEAD(sigd_sleep);
39 static void sigd_put_skb(struct sk_buff *skb)
42 static unsigned long silence;
43 DECLARE_WAITQUEUE(wait,current);
45 add_wait_queue(&sigd_sleep,&wait);
47 set_current_state(TASK_UNINTERRUPTIBLE);
48 if (time_after(jiffies, silence) || silence == 0) {
49 printk(KERN_INFO "atmsvc: waiting for signaling demon "
51 silence = (jiffies+30*HZ)|1;
55 current->state = TASK_RUNNING;
56 remove_wait_queue(&sigd_sleep,&wait);
59 printk(KERN_WARNING "atmsvc: no signaling demon\n");
64 atm_force_charge(sigd,skb->truesize);
65 skb_queue_tail(&sigd->sk->sk_receive_queue,skb);
66 sigd->sk->sk_data_ready(sigd->sk, skb->len);
70 static void modify_qos(struct atm_vcc *vcc,struct atmsvc_msg *msg)
74 if (test_bit(ATM_VF_RELEASED,&vcc->flags) ||
75 !test_bit(ATM_VF_READY,&vcc->flags))
78 if (!vcc->dev->ops->change_qos) msg->reply = -EOPNOTSUPP;
81 msg->reply = vcc->dev->ops->change_qos(vcc,&msg->qos,
83 if (!msg->reply) msg->type = as_okay;
86 * Should probably just turn around the old skb. But the, the buffer
87 * space accounting needs to follow the change too. Maybe later.
89 while (!(skb = alloc_skb(sizeof(struct atmsvc_msg),GFP_KERNEL)))
91 *(struct atmsvc_msg *) skb_put(skb,sizeof(struct atmsvc_msg)) = *msg;
96 static int sigd_send(struct atm_vcc *vcc,struct sk_buff *skb)
98 struct atmsvc_msg *msg;
99 struct atm_vcc *session_vcc;
101 msg = (struct atmsvc_msg *) skb->data;
102 atomic_sub(skb->truesize, &vcc->sk->sk_wmem_alloc);
103 DPRINTK("sigd_send %d (0x%lx)\n",(int) msg->type,
104 (unsigned long) msg->vcc);
105 vcc = *(struct atm_vcc **) &msg->vcc;
108 vcc->sk->sk_err = -msg->reply;
109 clear_bit(ATM_VF_WAITING, &vcc->flags);
110 if (!*vcc->local.sas_addr.prv &&
111 !*vcc->local.sas_addr.pub) {
112 vcc->local.sas_family = AF_ATMSVC;
113 memcpy(vcc->local.sas_addr.prv,
114 msg->local.sas_addr.prv,ATM_ESA_LEN);
115 memcpy(vcc->local.sas_addr.pub,
116 msg->local.sas_addr.pub,ATM_E164_LEN+1);
118 session_vcc = vcc->session ? vcc->session : vcc;
119 if (session_vcc->vpi || session_vcc->vci) break;
120 session_vcc->itf = msg->pvc.sap_addr.itf;
121 session_vcc->vpi = msg->pvc.sap_addr.vpi;
122 session_vcc->vci = msg->pvc.sap_addr.vci;
123 if (session_vcc->vpi || session_vcc->vci)
124 session_vcc->qos = msg->qos;
127 clear_bit(ATM_VF_REGIS,&vcc->flags);
128 clear_bit(ATM_VF_READY,&vcc->flags);
129 vcc->sk->sk_err = -msg->reply;
130 clear_bit(ATM_VF_WAITING, &vcc->flags);
133 vcc = *(struct atm_vcc **) &msg->listen_vcc;
134 DPRINTK("as_indicate!!!\n");
136 if (vcc->sk->sk_ack_backlog ==
137 vcc->sk->sk_max_ack_backlog) {
138 sigd_enq(NULL,as_reject,vcc,NULL,NULL);
140 goto as_indicate_complete;
142 vcc->sk->sk_ack_backlog++;
143 skb_queue_tail(&vcc->sk->sk_receive_queue, skb);
144 DPRINTK("waking vcc->sk->sk_sleep 0x%p\n", vcc->sk->sk_sleep);
145 vcc->sk->sk_state_change(vcc->sk);
146 as_indicate_complete:
147 release_sock(vcc->sk);
150 set_bit(ATM_VF_RELEASED,&vcc->flags);
151 vcc_release_async(vcc, msg->reply);
158 vcc->sk->sk_err_soft = msg->reply; /* < 0 failure, otherwise ep_ref */
159 clear_bit(ATM_VF_WAITING, &vcc->flags);
162 printk(KERN_ALERT "sigd_send: bad message type %d\n",
166 vcc->sk->sk_state_change(vcc->sk);
173 void sigd_enq2(struct atm_vcc *vcc,enum atmsvc_msg_type type,
174 struct atm_vcc *listen_vcc,const struct sockaddr_atmpvc *pvc,
175 const struct sockaddr_atmsvc *svc,const struct atm_qos *qos,int reply)
178 struct atmsvc_msg *msg;
179 static unsigned session = 0;
181 DPRINTK("sigd_enq %d (0x%p)\n",(int) type,vcc);
182 while (!(skb = alloc_skb(sizeof(struct atmsvc_msg),GFP_KERNEL)))
184 msg = (struct atmsvc_msg *) skb_put(skb,sizeof(struct atmsvc_msg));
185 memset(msg,0,sizeof(*msg));
187 *(struct atm_vcc **) &msg->vcc = vcc;
188 *(struct atm_vcc **) &msg->listen_vcc = listen_vcc;
190 if (qos) msg->qos = *qos;
191 if (vcc) msg->sap = vcc->sap;
192 if (svc) msg->svc = *svc;
193 if (vcc) msg->local = vcc->local;
194 if (pvc) msg->pvc = *pvc;
196 if (type == as_connect && test_bit(ATM_VF_SESSION, &vcc->flags))
197 msg->session = ++session;
198 /* every new pmp connect gets the next session number */
201 if (vcc) set_bit(ATM_VF_REGIS,&vcc->flags);
205 void sigd_enq(struct atm_vcc *vcc,enum atmsvc_msg_type type,
206 struct atm_vcc *listen_vcc,const struct sockaddr_atmpvc *pvc,
207 const struct sockaddr_atmsvc *svc)
209 sigd_enq2(vcc,type,listen_vcc,pvc,svc,vcc ? &vcc->qos : NULL,0);
210 /* other ISP applications may use "reply" */
214 static void purge_vcc(struct atm_vcc *vcc)
216 if (vcc->sk->sk_family == PF_ATMSVC &&
217 !test_bit(ATM_VF_META,&vcc->flags)) {
218 set_bit(ATM_VF_RELEASED,&vcc->flags);
219 vcc_release_async(vcc, -EUNATCH);
224 static void sigd_close(struct atm_vcc *vcc)
226 struct hlist_node *node;
230 DPRINTK("sigd_close\n");
232 if (skb_peek(&vcc->sk->sk_receive_queue))
233 printk(KERN_ERR "sigd_close: closing with requests pending\n");
234 skb_queue_purge(&vcc->sk->sk_receive_queue);
236 read_lock(&vcc_sklist_lock);
237 for(i = 0; i < VCC_HTABLE_SIZE; ++i) {
238 struct hlist_head *head = &vcc_hash[i];
240 sk_for_each(s, node, head) {
241 struct atm_vcc *vcc = atm_sk(s);
247 read_unlock(&vcc_sklist_lock);
251 static struct atmdev_ops sigd_dev_ops = {
257 static struct atm_dev sigd_dev = {
258 .ops = &sigd_dev_ops,
261 .lock = SPIN_LOCK_UNLOCKED
265 int sigd_attach(struct atm_vcc *vcc)
267 if (sigd) return -EADDRINUSE;
268 DPRINTK("sigd_attach\n");
270 vcc->dev = &sigd_dev;
271 vcc_insert_socket(vcc->sk);
272 set_bit(ATM_VF_META,&vcc->flags);
273 set_bit(ATM_VF_READY,&vcc->flags);
274 #ifdef WAIT_FOR_DEMON
275 wake_up(&sigd_sleep);