1 /* net/atm/signaling.c - ATM signaling */
3 /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
5 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
7 #include <linux/errno.h> /* error codes */
8 #include <linux/kernel.h> /* printk */
9 #include <linux/skbuff.h>
10 #include <linux/wait.h>
11 #include <linux/sched.h> /* jiffies and HZ */
12 #include <linux/atm.h> /* ATM stuff */
13 #include <linux/atmsap.h>
14 #include <linux/atmsvc.h>
15 #include <linux/atmdev.h>
16 #include <linux/bitops.h>
18 #include "resources.h"
19 #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
26 struct atm_vcc *sigd = NULL;
28 static DECLARE_WAIT_QUEUE_HEAD(sigd_sleep);
31 static void sigd_put_skb(struct sk_buff *skb)
34 DECLARE_WAITQUEUE(wait, current);
36 add_wait_queue(&sigd_sleep, &wait);
38 set_current_state(TASK_UNINTERRUPTIBLE);
39 pr_debug("atmsvc: waiting for signaling daemon...\n");
42 current->state = TASK_RUNNING;
43 remove_wait_queue(&sigd_sleep, &wait);
46 pr_debug("atmsvc: no signaling daemon\n");
51 atm_force_charge(sigd, skb->truesize);
52 skb_queue_tail(&sk_atm(sigd)->sk_receive_queue, skb);
53 sk_atm(sigd)->sk_data_ready(sk_atm(sigd), skb->len);
56 static void modify_qos(struct atm_vcc *vcc, struct atmsvc_msg *msg)
60 if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
61 !test_bit(ATM_VF_READY, &vcc->flags))
64 if (!vcc->dev->ops->change_qos)
65 msg->reply = -EOPNOTSUPP;
68 msg->reply = vcc->dev->ops->change_qos(vcc, &msg->qos,
74 * Should probably just turn around the old skb. But the, the buffer
75 * space accounting needs to follow the change too. Maybe later.
77 while (!(skb = alloc_skb(sizeof(struct atmsvc_msg), GFP_KERNEL)))
79 *(struct atmsvc_msg *)skb_put(skb, sizeof(struct atmsvc_msg)) = *msg;
83 static int sigd_send(struct atm_vcc *vcc, struct sk_buff *skb)
85 struct atmsvc_msg *msg;
86 struct atm_vcc *session_vcc;
89 msg = (struct atmsvc_msg *) skb->data;
90 atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
91 vcc = *(struct atm_vcc **) &msg->vcc;
92 pr_debug("%d (0x%lx)\n", (int)msg->type, (unsigned long)vcc);
97 sk->sk_err = -msg->reply;
98 clear_bit(ATM_VF_WAITING, &vcc->flags);
99 if (!*vcc->local.sas_addr.prv && !*vcc->local.sas_addr.pub) {
100 vcc->local.sas_family = AF_ATMSVC;
101 memcpy(vcc->local.sas_addr.prv,
102 msg->local.sas_addr.prv, ATM_ESA_LEN);
103 memcpy(vcc->local.sas_addr.pub,
104 msg->local.sas_addr.pub, ATM_E164_LEN + 1);
106 session_vcc = vcc->session ? vcc->session : vcc;
107 if (session_vcc->vpi || session_vcc->vci)
109 session_vcc->itf = msg->pvc.sap_addr.itf;
110 session_vcc->vpi = msg->pvc.sap_addr.vpi;
111 session_vcc->vci = msg->pvc.sap_addr.vci;
112 if (session_vcc->vpi || session_vcc->vci)
113 session_vcc->qos = msg->qos;
116 clear_bit(ATM_VF_REGIS, &vcc->flags);
117 clear_bit(ATM_VF_READY, &vcc->flags);
118 sk->sk_err = -msg->reply;
119 clear_bit(ATM_VF_WAITING, &vcc->flags);
122 vcc = *(struct atm_vcc **)&msg->listen_vcc;
124 pr_debug("as_indicate!!!\n");
126 if (sk_acceptq_is_full(sk)) {
127 sigd_enq(NULL, as_reject, vcc, NULL, NULL);
129 goto as_indicate_complete;
131 sk->sk_ack_backlog++;
132 skb_queue_tail(&sk->sk_receive_queue, skb);
133 pr_debug("waking sk->sk_sleep 0x%p\n", sk->sk_sleep);
134 sk->sk_state_change(sk);
135 as_indicate_complete:
139 set_bit(ATM_VF_RELEASED, &vcc->flags);
140 vcc_release_async(vcc, msg->reply);
143 modify_qos(vcc, msg);
147 sk->sk_err_soft = msg->reply;
148 /* < 0 failure, otherwise ep_ref */
149 clear_bit(ATM_VF_WAITING, &vcc->flags);
152 pr_alert("bad message type %d\n", (int)msg->type);
155 sk->sk_state_change(sk);
161 void sigd_enq2(struct atm_vcc *vcc, enum atmsvc_msg_type type,
162 struct atm_vcc *listen_vcc, const struct sockaddr_atmpvc *pvc,
163 const struct sockaddr_atmsvc *svc, const struct atm_qos *qos,
167 struct atmsvc_msg *msg;
168 static unsigned session = 0;
170 pr_debug("%d (0x%p)\n", (int)type, vcc);
171 while (!(skb = alloc_skb(sizeof(struct atmsvc_msg), GFP_KERNEL)))
173 msg = (struct atmsvc_msg *)skb_put(skb, sizeof(struct atmsvc_msg));
174 memset(msg, 0, sizeof(*msg));
176 *(struct atm_vcc **) &msg->vcc = vcc;
177 *(struct atm_vcc **) &msg->listen_vcc = listen_vcc;
186 msg->local = vcc->local;
190 if (type == as_connect && test_bit(ATM_VF_SESSION, &vcc->flags))
191 msg->session = ++session;
192 /* every new pmp connect gets the next session number */
196 set_bit(ATM_VF_REGIS, &vcc->flags);
199 void sigd_enq(struct atm_vcc *vcc, enum atmsvc_msg_type type,
200 struct atm_vcc *listen_vcc, const struct sockaddr_atmpvc *pvc,
201 const struct sockaddr_atmsvc *svc)
203 sigd_enq2(vcc, type, listen_vcc, pvc, svc, vcc ? &vcc->qos : NULL, 0);
204 /* other ISP applications may use "reply" */
207 static void purge_vcc(struct atm_vcc *vcc)
209 if (sk_atm(vcc)->sk_family == PF_ATMSVC &&
210 !test_bit(ATM_VF_META, &vcc->flags)) {
211 set_bit(ATM_VF_RELEASED, &vcc->flags);
212 clear_bit(ATM_VF_REGIS, &vcc->flags);
213 vcc_release_async(vcc, -EUNATCH);
217 static void sigd_close(struct atm_vcc *vcc)
219 struct hlist_node *node;
225 if (skb_peek(&sk_atm(vcc)->sk_receive_queue))
226 pr_err("closing with requests pending\n");
227 skb_queue_purge(&sk_atm(vcc)->sk_receive_queue);
229 read_lock(&vcc_sklist_lock);
230 for (i = 0; i < VCC_HTABLE_SIZE; ++i) {
231 struct hlist_head *head = &vcc_hash[i];
233 sk_for_each(s, node, head) {
239 read_unlock(&vcc_sklist_lock);
242 static struct atmdev_ops sigd_dev_ops = {
247 static struct atm_dev sigd_dev = {
248 .ops = &sigd_dev_ops,
251 .lock = __SPIN_LOCK_UNLOCKED(sigd_dev.lock)
254 int sigd_attach(struct atm_vcc *vcc)
260 vcc->dev = &sigd_dev;
261 vcc_insert_socket(sk_atm(vcc));
262 set_bit(ATM_VF_META, &vcc->flags);
263 set_bit(ATM_VF_READY, &vcc->flags);
264 #ifdef WAIT_FOR_DEMON
265 wake_up(&sigd_sleep);