To modify Ixia port numbers and IP in pod.yaml
[kvmfornfv.git] / kernel / net / atm / signaling.c
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         atomic_sub(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 = (struct atmsvc_msg *)skb_put(skb, sizeof(struct atmsvc_msg));
154         memset(msg, 0, sizeof(*msg));
155         msg->type = type;
156         *(struct atm_vcc **) &msg->vcc = vcc;
157         *(struct atm_vcc **) &msg->listen_vcc = listen_vcc;
158         msg->reply = reply;
159         if (qos)
160                 msg->qos = *qos;
161         if (vcc)
162                 msg->sap = vcc->sap;
163         if (svc)
164                 msg->svc = *svc;
165         if (vcc)
166                 msg->local = vcc->local;
167         if (pvc)
168                 msg->pvc = *pvc;
169         if (vcc) {
170                 if (type == as_connect && test_bit(ATM_VF_SESSION, &vcc->flags))
171                         msg->session = ++session;
172                         /* every new pmp connect gets the next session number */
173         }
174         sigd_put_skb(skb);
175         if (vcc)
176                 set_bit(ATM_VF_REGIS, &vcc->flags);
177 }
178
179 void sigd_enq(struct atm_vcc *vcc, enum atmsvc_msg_type type,
180               struct atm_vcc *listen_vcc, const struct sockaddr_atmpvc *pvc,
181               const struct sockaddr_atmsvc *svc)
182 {
183         sigd_enq2(vcc, type, listen_vcc, pvc, svc, vcc ? &vcc->qos : NULL, 0);
184         /* other ISP applications may use "reply" */
185 }
186
187 static void purge_vcc(struct atm_vcc *vcc)
188 {
189         if (sk_atm(vcc)->sk_family == PF_ATMSVC &&
190             !test_bit(ATM_VF_META, &vcc->flags)) {
191                 set_bit(ATM_VF_RELEASED, &vcc->flags);
192                 clear_bit(ATM_VF_REGIS, &vcc->flags);
193                 vcc_release_async(vcc, -EUNATCH);
194         }
195 }
196
197 static void sigd_close(struct atm_vcc *vcc)
198 {
199         struct sock *s;
200         int i;
201
202         pr_debug("\n");
203         sigd = NULL;
204         if (skb_peek(&sk_atm(vcc)->sk_receive_queue))
205                 pr_err("closing with requests pending\n");
206         skb_queue_purge(&sk_atm(vcc)->sk_receive_queue);
207
208         read_lock(&vcc_sklist_lock);
209         for (i = 0; i < VCC_HTABLE_SIZE; ++i) {
210                 struct hlist_head *head = &vcc_hash[i];
211
212                 sk_for_each(s, head) {
213                         vcc = atm_sk(s);
214
215                         purge_vcc(vcc);
216                 }
217         }
218         read_unlock(&vcc_sklist_lock);
219 }
220
221 static struct atmdev_ops sigd_dev_ops = {
222         .close = sigd_close,
223         .send = sigd_send
224 };
225
226 static struct atm_dev sigd_dev = {
227         .ops =          &sigd_dev_ops,
228         .type =         "sig",
229         .number =       999,
230         .lock =         __SPIN_LOCK_UNLOCKED(sigd_dev.lock)
231 };
232
233 int sigd_attach(struct atm_vcc *vcc)
234 {
235         if (sigd)
236                 return -EADDRINUSE;
237         pr_debug("\n");
238         sigd = vcc;
239         vcc->dev = &sigd_dev;
240         vcc_insert_socket(sk_atm(vcc));
241         set_bit(ATM_VF_META, &vcc->flags);
242         set_bit(ATM_VF_READY, &vcc->flags);
243         return 0;
244 }