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1da177e4 LT |
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 | |
1da177e4 LT |
42 | DECLARE_WAITQUEUE(wait,current); |
43 | ||
44 | add_wait_queue(&sigd_sleep,&wait); | |
45 | while (!sigd) { | |
46 | set_current_state(TASK_UNINTERRUPTIBLE); | |
0f8f325b | 47 | DPRINTK("atmsvc: waiting for signaling demon...\n"); |
1da177e4 LT |
48 | schedule(); |
49 | } | |
50 | current->state = TASK_RUNNING; | |
51 | remove_wait_queue(&sigd_sleep,&wait); | |
52 | #else | |
53 | if (!sigd) { | |
0f8f325b | 54 | DPRINTK("atmsvc: no signaling demon\n"); |
1da177e4 LT |
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; | |
208a6dfb | 132 | sk = sk_atm(vcc); |
1da177e4 LT |
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 && | |
9301e320 CW |
215 | !test_bit(ATM_VF_META, &vcc->flags)) { |
216 | set_bit(ATM_VF_RELEASED, &vcc->flags); | |
217 | clear_bit(ATM_VF_REGIS, &vcc->flags); | |
1da177e4 LT |
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 | ||
9301e320 | 242 | purge_vcc(vcc); |
1da177e4 LT |
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, | |
4ef8d0ae | 259 | .lock = __SPIN_LOCK_UNLOCKED(sigd_dev.lock) |
1da177e4 LT |
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 | } |