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Linux/net/atm/signaling.c

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  1 /* net/atm/signaling.c - ATM signaling */
  2 
  3 /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
  4 
  5 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
  6 
  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>
 17 #include <linux/slab.h>
 18 
 19 #include "resources.h"
 20 #include "signaling.h"
 21 
 22 struct atm_vcc *sigd = NULL;
 23 
 24 static void sigd_put_skb(struct sk_buff *skb)
 25 {
 26         if (!sigd) {
 27                 pr_debug("atmsvc: no signaling daemon\n");
 28                 kfree_skb(skb);
 29                 return;
 30         }
 31         atm_force_charge(sigd, skb->truesize);
 32         skb_queue_tail(&sk_atm(sigd)->sk_receive_queue, skb);
 33         sk_atm(sigd)->sk_data_ready(sk_atm(sigd));
 34 }
 35 
 36 static void modify_qos(struct atm_vcc *vcc, struct atmsvc_msg *msg)
 37 {
 38         struct sk_buff *skb;
 39 
 40         if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
 41             !test_bit(ATM_VF_READY, &vcc->flags))
 42                 return;
 43         msg->type = as_error;
 44         if (!vcc->dev->ops->change_qos)
 45                 msg->reply = -EOPNOTSUPP;
 46         else {
 47                 /* should lock VCC */
 48                 msg->reply = vcc->dev->ops->change_qos(vcc, &msg->qos,
 49                                                        msg->reply);
 50                 if (!msg->reply)
 51                         msg->type = as_okay;
 52         }
 53         /*
 54          * Should probably just turn around the old skb. But the, the buffer
 55          * space accounting needs to follow the change too. Maybe later.
 56          */
 57         while (!(skb = alloc_skb(sizeof(struct atmsvc_msg), GFP_KERNEL)))
 58                 schedule();
 59         *(struct atmsvc_msg *)skb_put(skb, sizeof(struct atmsvc_msg)) = *msg;
 60         sigd_put_skb(skb);
 61 }
 62 
 63 static int sigd_send(struct atm_vcc *vcc, struct sk_buff *skb)
 64 {
 65         struct atmsvc_msg *msg;
 66         struct atm_vcc *session_vcc;
 67         struct sock *sk;
 68 
 69         msg = (struct atmsvc_msg *) skb->data;
 70         WARN_ON(refcount_sub_and_test(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc));
 71         vcc = *(struct atm_vcc **) &msg->vcc;
 72         pr_debug("%d (0x%lx)\n", (int)msg->type, (unsigned long)vcc);
 73         sk = sk_atm(vcc);
 74 
 75         switch (msg->type) {
 76         case as_okay:
 77                 sk->sk_err = -msg->reply;
 78                 clear_bit(ATM_VF_WAITING, &vcc->flags);
 79                 if (!*vcc->local.sas_addr.prv && !*vcc->local.sas_addr.pub) {
 80                         vcc->local.sas_family = AF_ATMSVC;
 81                         memcpy(vcc->local.sas_addr.prv,
 82                                msg->local.sas_addr.prv, ATM_ESA_LEN);
 83                         memcpy(vcc->local.sas_addr.pub,
 84                                msg->local.sas_addr.pub, ATM_E164_LEN + 1);
 85                 }
 86                 session_vcc = vcc->session ? vcc->session : vcc;
 87                 if (session_vcc->vpi || session_vcc->vci)
 88                         break;
 89                 session_vcc->itf = msg->pvc.sap_addr.itf;
 90                 session_vcc->vpi = msg->pvc.sap_addr.vpi;
 91                 session_vcc->vci = msg->pvc.sap_addr.vci;
 92                 if (session_vcc->vpi || session_vcc->vci)
 93                         session_vcc->qos = msg->qos;
 94                 break;
 95         case as_error:
 96                 clear_bit(ATM_VF_REGIS, &vcc->flags);
 97                 clear_bit(ATM_VF_READY, &vcc->flags);
 98                 sk->sk_err = -msg->reply;
 99                 clear_bit(ATM_VF_WAITING, &vcc->flags);
100                 break;
101         case as_indicate:
102                 vcc = *(struct atm_vcc **)&msg->listen_vcc;
103                 sk = sk_atm(vcc);
104                 pr_debug("as_indicate!!!\n");
105                 lock_sock(sk);
106                 if (sk_acceptq_is_full(sk)) {
107                         sigd_enq(NULL, as_reject, vcc, NULL, NULL);
108                         dev_kfree_skb(skb);
109                         goto as_indicate_complete;
110                 }
111                 sk->sk_ack_backlog++;
112                 skb_queue_tail(&sk->sk_receive_queue, skb);
113                 pr_debug("waking sk_sleep(sk) 0x%p\n", sk_sleep(sk));
114                 sk->sk_state_change(sk);
115 as_indicate_complete:
116                 release_sock(sk);
117                 return 0;
118         case as_close:
119                 set_bit(ATM_VF_RELEASED, &vcc->flags);
120                 vcc_release_async(vcc, msg->reply);
121                 goto out;
122         case as_modify:
123                 modify_qos(vcc, msg);
124                 break;
125         case as_addparty:
126         case as_dropparty:
127                 sk->sk_err_soft = -msg->reply;
128                                         /* < 0 failure, otherwise ep_ref */
129                 clear_bit(ATM_VF_WAITING, &vcc->flags);
130                 break;
131         default:
132                 pr_alert("bad message type %d\n", (int)msg->type);
133                 return -EINVAL;
134         }
135         sk->sk_state_change(sk);
136 out:
137         dev_kfree_skb(skb);
138         return 0;
139 }
140 
141 void sigd_enq2(struct atm_vcc *vcc, enum atmsvc_msg_type type,
142                struct atm_vcc *listen_vcc, const struct sockaddr_atmpvc *pvc,
143                const struct sockaddr_atmsvc *svc, const struct atm_qos *qos,
144                int reply)
145 {
146         struct sk_buff *skb;
147         struct atmsvc_msg *msg;
148         static unsigned int session = 0;
149 
150         pr_debug("%d (0x%p)\n", (int)type, vcc);
151         while (!(skb = alloc_skb(sizeof(struct atmsvc_msg), GFP_KERNEL)))
152                 schedule();
153         msg = skb_put_zero(skb, sizeof(struct atmsvc_msg));
154         msg->type = type;
155         *(struct atm_vcc **) &msg->vcc = vcc;
156         *(struct atm_vcc **) &msg->listen_vcc = listen_vcc;
157         msg->reply = reply;
158         if (qos)
159                 msg->qos = *qos;
160         if (vcc)
161                 msg->sap = vcc->sap;
162         if (svc)
163                 msg->svc = *svc;
164         if (vcc)
165                 msg->local = vcc->local;
166         if (pvc)
167                 msg->pvc = *pvc;
168         if (vcc) {
169                 if (type == as_connect && test_bit(ATM_VF_SESSION, &vcc->flags))
170                         msg->session = ++session;
171                         /* every new pmp connect gets the next session number */
172         }
173         sigd_put_skb(skb);
174         if (vcc)
175                 set_bit(ATM_VF_REGIS, &vcc->flags);
176 }
177 
178 void sigd_enq(struct atm_vcc *vcc, enum atmsvc_msg_type type,
179               struct atm_vcc *listen_vcc, const struct sockaddr_atmpvc *pvc,
180               const struct sockaddr_atmsvc *svc)
181 {
182         sigd_enq2(vcc, type, listen_vcc, pvc, svc, vcc ? &vcc->qos : NULL, 0);
183         /* other ISP applications may use "reply" */
184 }
185 
186 static void purge_vcc(struct atm_vcc *vcc)
187 {
188         if (sk_atm(vcc)->sk_family == PF_ATMSVC &&
189             !test_bit(ATM_VF_META, &vcc->flags)) {
190                 set_bit(ATM_VF_RELEASED, &vcc->flags);
191                 clear_bit(ATM_VF_REGIS, &vcc->flags);
192                 vcc_release_async(vcc, -EUNATCH);
193         }
194 }
195 
196 static void sigd_close(struct atm_vcc *vcc)
197 {
198         struct sock *s;
199         int i;
200 
201         pr_debug("\n");
202         sigd = NULL;
203         if (skb_peek(&sk_atm(vcc)->sk_receive_queue))
204                 pr_err("closing with requests pending\n");
205         skb_queue_purge(&sk_atm(vcc)->sk_receive_queue);
206 
207         read_lock(&vcc_sklist_lock);
208         for (i = 0; i < VCC_HTABLE_SIZE; ++i) {
209                 struct hlist_head *head = &vcc_hash[i];
210 
211                 sk_for_each(s, head) {
212                         vcc = atm_sk(s);
213 
214                         purge_vcc(vcc);
215                 }
216         }
217         read_unlock(&vcc_sklist_lock);
218 }
219 
220 static struct atmdev_ops sigd_dev_ops = {
221         .close = sigd_close,
222         .send = sigd_send
223 };
224 
225 static struct atm_dev sigd_dev = {
226         .ops =          &sigd_dev_ops,
227         .type =         "sig",
228         .number =       999,
229         .lock =         __SPIN_LOCK_UNLOCKED(sigd_dev.lock)
230 };
231 
232 int sigd_attach(struct atm_vcc *vcc)
233 {
234         if (sigd)
235                 return -EADDRINUSE;
236         pr_debug("\n");
237         sigd = vcc;
238         vcc->dev = &sigd_dev;
239         vcc_insert_socket(sk_atm(vcc));
240         set_bit(ATM_VF_META, &vcc->flags);
241         set_bit(ATM_VF_READY, &vcc->flags);
242         return 0;
243 }
244 

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