Merge branch 'e1000-upstream' of git://198.78.49.142/linux-2.6
[linux-2.6] / net / atm / signaling.c
1 /* net/atm/signaling.c - ATM signaling */
2
3 /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
4
5
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>
16
17 #include "resources.h"
18 #include "signaling.h"
19
20
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
24                                    crashes. */
25
26 #if 0
27 #define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
28 #else
29 #define DPRINTK(format,args...)
30 #endif
31
32
33 struct atm_vcc *sigd = NULL;
34 #ifdef WAIT_FOR_DEMON
35 static DECLARE_WAIT_QUEUE_HEAD(sigd_sleep);
36 #endif
37
38
39 static void sigd_put_skb(struct sk_buff *skb)
40 {
41 #ifdef WAIT_FOR_DEMON
42         DECLARE_WAITQUEUE(wait,current);
43
44         add_wait_queue(&sigd_sleep,&wait);
45         while (!sigd) {
46                 set_current_state(TASK_UNINTERRUPTIBLE);
47                 DPRINTK("atmsvc: waiting for signaling demon...\n");
48                 schedule();
49         }
50         current->state = TASK_RUNNING;
51         remove_wait_queue(&sigd_sleep,&wait);
52 #else
53         if (!sigd) {
54                 DPRINTK("atmsvc: no signaling demon\n");
55                 kfree_skb(skb);
56                 return;
57         }
58 #endif
59         atm_force_charge(sigd,skb->truesize);
60         skb_queue_tail(&sk_atm(sigd)->sk_receive_queue,skb);
61         sk_atm(sigd)->sk_data_ready(sk_atm(sigd), skb->len);
62 }
63
64
65 static void modify_qos(struct atm_vcc *vcc,struct atmsvc_msg *msg)
66 {
67         struct sk_buff *skb;
68
69         if (test_bit(ATM_VF_RELEASED,&vcc->flags) ||
70             !test_bit(ATM_VF_READY,&vcc->flags))
71                 return;
72         msg->type = as_error;
73         if (!vcc->dev->ops->change_qos) msg->reply = -EOPNOTSUPP;
74         else {
75                 /* should lock VCC */
76                 msg->reply = vcc->dev->ops->change_qos(vcc,&msg->qos,
77                     msg->reply);
78                 if (!msg->reply) msg->type = as_okay;
79         }
80         /*
81          * Should probably just turn around the old skb. But the, the buffer
82          * space accounting needs to follow the change too. Maybe later.
83          */
84         while (!(skb = alloc_skb(sizeof(struct atmsvc_msg),GFP_KERNEL)))
85                 schedule();
86         *(struct atmsvc_msg *) skb_put(skb,sizeof(struct atmsvc_msg)) = *msg;
87         sigd_put_skb(skb);
88 }
89
90
91 static int sigd_send(struct atm_vcc *vcc,struct sk_buff *skb)
92 {
93         struct atmsvc_msg *msg;
94         struct atm_vcc *session_vcc;
95         struct sock *sk;
96
97         msg = (struct atmsvc_msg *) skb->data;
98         atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
99         DPRINTK("sigd_send %d (0x%lx)\n",(int) msg->type,
100           (unsigned long) msg->vcc);
101         vcc = *(struct atm_vcc **) &msg->vcc;
102         sk = sk_atm(vcc);
103
104         switch (msg->type) {
105                 case as_okay:
106                         sk->sk_err = -msg->reply;
107                         clear_bit(ATM_VF_WAITING, &vcc->flags);
108                         if (!*vcc->local.sas_addr.prv &&
109                             !*vcc->local.sas_addr.pub) {
110                                 vcc->local.sas_family = AF_ATMSVC;
111                                 memcpy(vcc->local.sas_addr.prv,
112                                     msg->local.sas_addr.prv,ATM_ESA_LEN);
113                                 memcpy(vcc->local.sas_addr.pub,
114                                     msg->local.sas_addr.pub,ATM_E164_LEN+1);
115                         }
116                         session_vcc = vcc->session ? vcc->session : vcc;
117                         if (session_vcc->vpi || session_vcc->vci) break;
118                         session_vcc->itf = msg->pvc.sap_addr.itf;
119                         session_vcc->vpi = msg->pvc.sap_addr.vpi;
120                         session_vcc->vci = msg->pvc.sap_addr.vci;
121                         if (session_vcc->vpi || session_vcc->vci)
122                                 session_vcc->qos = msg->qos;
123                         break;
124                 case as_error:
125                         clear_bit(ATM_VF_REGIS,&vcc->flags);
126                         clear_bit(ATM_VF_READY,&vcc->flags);
127                         sk->sk_err = -msg->reply;
128                         clear_bit(ATM_VF_WAITING, &vcc->flags);
129                         break;
130                 case as_indicate:
131                         vcc = *(struct atm_vcc **) &msg->listen_vcc;
132                         sk = sk_atm(vcc);
133                         DPRINTK("as_indicate!!!\n");
134                         lock_sock(sk);
135                         if (sk_acceptq_is_full(sk)) {
136                                 sigd_enq(NULL,as_reject,vcc,NULL,NULL);
137                                 dev_kfree_skb(skb);
138                                 goto as_indicate_complete;
139                         }
140                         sk->sk_ack_backlog++;
141                         skb_queue_tail(&sk->sk_receive_queue, skb);
142                         DPRINTK("waking sk->sk_sleep 0x%p\n", sk->sk_sleep);
143                         sk->sk_state_change(sk);
144 as_indicate_complete:
145                         release_sock(sk);
146                         return 0;
147                 case as_close:
148                         set_bit(ATM_VF_RELEASED,&vcc->flags);
149                         vcc_release_async(vcc, msg->reply);
150                         goto out;
151                 case as_modify:
152                         modify_qos(vcc,msg);
153                         break;
154                 case as_addparty:
155                 case as_dropparty:
156                         sk->sk_err_soft = msg->reply;   /* < 0 failure, otherwise ep_ref */
157                         clear_bit(ATM_VF_WAITING, &vcc->flags);
158                         break;
159                 default:
160                         printk(KERN_ALERT "sigd_send: bad message type %d\n",
161                             (int) msg->type);
162                         return -EINVAL;
163         }
164         sk->sk_state_change(sk);
165 out:
166         dev_kfree_skb(skb);
167         return 0;
168 }
169
170
171 void sigd_enq2(struct atm_vcc *vcc,enum atmsvc_msg_type type,
172     struct atm_vcc *listen_vcc,const struct sockaddr_atmpvc *pvc,
173     const struct sockaddr_atmsvc *svc,const struct atm_qos *qos,int reply)
174 {
175         struct sk_buff *skb;
176         struct atmsvc_msg *msg;
177         static unsigned session = 0;
178
179         DPRINTK("sigd_enq %d (0x%p)\n",(int) type,vcc);
180         while (!(skb = alloc_skb(sizeof(struct atmsvc_msg),GFP_KERNEL)))
181                 schedule();
182         msg = (struct atmsvc_msg *) skb_put(skb,sizeof(struct atmsvc_msg));
183         memset(msg,0,sizeof(*msg));
184         msg->type = type;
185         *(struct atm_vcc **) &msg->vcc = vcc;
186         *(struct atm_vcc **) &msg->listen_vcc = listen_vcc;
187         msg->reply = reply;
188         if (qos) msg->qos = *qos;
189         if (vcc) msg->sap = vcc->sap;
190         if (svc) msg->svc = *svc;
191         if (vcc) msg->local = vcc->local;
192         if (pvc) msg->pvc = *pvc;
193         if (vcc) {
194                 if (type == as_connect && test_bit(ATM_VF_SESSION, &vcc->flags))
195                         msg->session = ++session;
196                         /* every new pmp connect gets the next session number */
197         }
198         sigd_put_skb(skb);
199         if (vcc) set_bit(ATM_VF_REGIS,&vcc->flags);
200 }
201
202
203 void sigd_enq(struct atm_vcc *vcc,enum atmsvc_msg_type type,
204     struct atm_vcc *listen_vcc,const struct sockaddr_atmpvc *pvc,
205     const struct sockaddr_atmsvc *svc)
206 {
207         sigd_enq2(vcc,type,listen_vcc,pvc,svc,vcc ? &vcc->qos : NULL,0);
208         /* other ISP applications may use "reply" */
209 }
210
211
212 static void purge_vcc(struct atm_vcc *vcc)
213 {
214         if (sk_atm(vcc)->sk_family == PF_ATMSVC &&
215             !test_bit(ATM_VF_META, &vcc->flags)) {
216                 set_bit(ATM_VF_RELEASED, &vcc->flags);
217                 clear_bit(ATM_VF_REGIS, &vcc->flags);
218                 vcc_release_async(vcc, -EUNATCH);
219         }
220 }
221
222
223 static void sigd_close(struct atm_vcc *vcc)
224 {
225         struct hlist_node *node;
226         struct sock *s;
227         int i;
228
229         DPRINTK("sigd_close\n");
230         sigd = NULL;
231         if (skb_peek(&sk_atm(vcc)->sk_receive_queue))
232                 printk(KERN_ERR "sigd_close: closing with requests pending\n");
233         skb_queue_purge(&sk_atm(vcc)->sk_receive_queue);
234
235         read_lock(&vcc_sklist_lock);
236         for(i = 0; i < VCC_HTABLE_SIZE; ++i) {
237                 struct hlist_head *head = &vcc_hash[i];
238
239                 sk_for_each(s, node, head) {
240                         struct atm_vcc *vcc = atm_sk(s);
241
242                         purge_vcc(vcc);
243                 }
244         }
245         read_unlock(&vcc_sklist_lock);
246 }
247
248
249 static struct atmdev_ops sigd_dev_ops = {
250         .close = sigd_close,
251         .send = sigd_send
252 };
253
254
255 static struct atm_dev sigd_dev = {
256         .ops =          &sigd_dev_ops,
257         .type =         "sig",
258         .number =       999,
259         .lock =         SPIN_LOCK_UNLOCKED
260 };
261
262
263 int sigd_attach(struct atm_vcc *vcc)
264 {
265         if (sigd) return -EADDRINUSE;
266         DPRINTK("sigd_attach\n");
267         sigd = vcc;
268         vcc->dev = &sigd_dev;
269         vcc_insert_socket(sk_atm(vcc));
270         set_bit(ATM_VF_META,&vcc->flags);
271         set_bit(ATM_VF_READY,&vcc->flags);
272 #ifdef WAIT_FOR_DEMON
273         wake_up(&sigd_sleep);
274 #endif
275         return 0;
276 }