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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* net/atm/signaling.c - ATM signaling */
2
3/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
4
Joe Perches99824462010-01-26 11:40:00 +00005#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
Linus Torvalds1da177e2005-04-16 15:20:36 -07006
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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090017#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018
19#include "resources.h"
20#include "signaling.h"
21
Linus Torvalds1da177e2005-04-16 15:20:36 -070022struct atm_vcc *sigd = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070023
Linus Torvalds1da177e2005-04-16 15:20:36 -070024static void sigd_put_skb(struct sk_buff *skb)
25{
Linus Torvalds1da177e2005-04-16 15:20:36 -070026 if (!sigd) {
Joe Perches99824462010-01-26 11:40:00 +000027 pr_debug("atmsvc: no signaling daemon\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -070028 kfree_skb(skb);
29 return;
30 }
Joe Perches0ec96e62010-01-26 11:40:17 +000031 atm_force_charge(sigd, skb->truesize);
32 skb_queue_tail(&sk_atm(sigd)->sk_receive_queue, skb);
David S. Miller676d2362014-04-11 16:15:36 -040033 sk_atm(sigd)->sk_data_ready(sk_atm(sigd));
Linus Torvalds1da177e2005-04-16 15:20:36 -070034}
35
Joe Perches0ec96e62010-01-26 11:40:17 +000036static void modify_qos(struct atm_vcc *vcc, struct atmsvc_msg *msg)
Linus Torvalds1da177e2005-04-16 15:20:36 -070037{
38 struct sk_buff *skb;
39
Joe Perches0ec96e62010-01-26 11:40:17 +000040 if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
41 !test_bit(ATM_VF_READY, &vcc->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -070042 return;
43 msg->type = as_error;
Joe Perches0ec96e62010-01-26 11:40:17 +000044 if (!vcc->dev->ops->change_qos)
45 msg->reply = -EOPNOTSUPP;
Linus Torvalds1da177e2005-04-16 15:20:36 -070046 else {
47 /* should lock VCC */
Joe Perches0ec96e62010-01-26 11:40:17 +000048 msg->reply = vcc->dev->ops->change_qos(vcc, &msg->qos,
49 msg->reply);
50 if (!msg->reply)
51 msg->type = as_okay;
Linus Torvalds1da177e2005-04-16 15:20:36 -070052 }
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 */
Joe Perches0ec96e62010-01-26 11:40:17 +000057 while (!(skb = alloc_skb(sizeof(struct atmsvc_msg), GFP_KERNEL)))
Linus Torvalds1da177e2005-04-16 15:20:36 -070058 schedule();
Joe Perches0ec96e62010-01-26 11:40:17 +000059 *(struct atmsvc_msg *)skb_put(skb, sizeof(struct atmsvc_msg)) = *msg;
Linus Torvalds1da177e2005-04-16 15:20:36 -070060 sigd_put_skb(skb);
61}
62
Joe Perches0ec96e62010-01-26 11:40:17 +000063static int sigd_send(struct atm_vcc *vcc, struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -070064{
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);
Linus Torvalds1da177e2005-04-16 15:20:36 -070071 vcc = *(struct atm_vcc **) &msg->vcc;
Joe Perches99824462010-01-26 11:40:00 +000072 pr_debug("%d (0x%lx)\n", (int)msg->type, (unsigned long)vcc);
Linus Torvalds1da177e2005-04-16 15:20:36 -070073 sk = sk_atm(vcc);
74
75 switch (msg->type) {
Joe Perches0ec96e62010-01-26 11:40:17 +000076 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)
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 break;
Joe Perches0ec96e62010-01-26 11:40:17 +000089 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);
Eric Dumazetaa395142010-04-20 13:03:51 +0000113 pr_debug("waking sk_sleep(sk) 0x%p\n", sk_sleep(sk));
Joe Perches0ec96e62010-01-26 11:40:17 +0000114 sk->sk_state_change(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115as_indicate_complete:
Joe Perches0ec96e62010-01-26 11:40:17 +0000116 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:
Stefan Hajnoczic6852932016-05-18 17:42:13 -0700127 sk->sk_err_soft = -msg->reply;
Joe Perches0ec96e62010-01-26 11:40:17 +0000128 /* < 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 }
135 sk->sk_state_change(sk);
136out:
137 dev_kfree_skb(skb);
138 return 0;
139}
140
Joe Perches0ec96e62010-01-26 11:40:17 +0000141void 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)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145{
146 struct sk_buff *skb;
147 struct atmsvc_msg *msg;
Eric Dumazet95c96172012-04-15 05:58:06 +0000148 static unsigned int session = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149
Joe Perches99824462010-01-26 11:40:00 +0000150 pr_debug("%d (0x%p)\n", (int)type, vcc);
Joe Perches0ec96e62010-01-26 11:40:17 +0000151 while (!(skb = alloc_skb(sizeof(struct atmsvc_msg), GFP_KERNEL)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152 schedule();
Joe Perches0ec96e62010-01-26 11:40:17 +0000153 msg = (struct atmsvc_msg *)skb_put(skb, sizeof(struct atmsvc_msg));
154 memset(msg, 0, sizeof(*msg));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 msg->type = type;
156 *(struct atm_vcc **) &msg->vcc = vcc;
157 *(struct atm_vcc **) &msg->listen_vcc = listen_vcc;
158 msg->reply = reply;
Joe Perches0ec96e62010-01-26 11:40:17 +0000159 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 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);
Joe Perches0ec96e62010-01-26 11:40:17 +0000175 if (vcc)
176 set_bit(ATM_VF_REGIS, &vcc->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177}
178
Joe Perches0ec96e62010-01-26 11:40:17 +0000179void 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)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182{
Joe Perches0ec96e62010-01-26 11:40:17 +0000183 sigd_enq2(vcc, type, listen_vcc, pvc, svc, vcc ? &vcc->qos : NULL, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 /* other ISP applications may use "reply" */
185}
186
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187static void purge_vcc(struct atm_vcc *vcc)
188{
189 if (sk_atm(vcc)->sk_family == PF_ATMSVC &&
Chas Williams9301e322005-09-28 16:35:01 -0700190 !test_bit(ATM_VF_META, &vcc->flags)) {
191 set_bit(ATM_VF_RELEASED, &vcc->flags);
192 clear_bit(ATM_VF_REGIS, &vcc->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 vcc_release_async(vcc, -EUNATCH);
194 }
195}
196
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197static void sigd_close(struct atm_vcc *vcc)
198{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 struct sock *s;
200 int i;
201
Joe Perches99824462010-01-26 11:40:00 +0000202 pr_debug("\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 sigd = NULL;
204 if (skb_peek(&sk_atm(vcc)->sk_receive_queue))
Joe Perches99824462010-01-26 11:40:00 +0000205 pr_err("closing with requests pending\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206 skb_queue_purge(&sk_atm(vcc)->sk_receive_queue);
207
208 read_lock(&vcc_sklist_lock);
Joe Perches0ec96e62010-01-26 11:40:17 +0000209 for (i = 0; i < VCC_HTABLE_SIZE; ++i) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 struct hlist_head *head = &vcc_hash[i];
211
Sasha Levinb67bfe02013-02-27 17:06:00 -0800212 sk_for_each(s, head) {
Stephen Hemmingercfcabdc2007-10-09 01:59:42 -0700213 vcc = atm_sk(s);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214
Chas Williams9301e322005-09-28 16:35:01 -0700215 purge_vcc(vcc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216 }
217 }
218 read_unlock(&vcc_sklist_lock);
219}
220
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221static struct atmdev_ops sigd_dev_ops = {
222 .close = sigd_close,
223 .send = sigd_send
224};
225
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226static struct atm_dev sigd_dev = {
227 .ops = &sigd_dev_ops,
228 .type = "sig",
229 .number = 999,
Milind Arun Choudhary4ef8d0a2007-04-26 01:37:44 -0700230 .lock = __SPIN_LOCK_UNLOCKED(sigd_dev.lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231};
232
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233int sigd_attach(struct atm_vcc *vcc)
234{
Joe Perches0ec96e62010-01-26 11:40:17 +0000235 if (sigd)
236 return -EADDRINUSE;
Joe Perches99824462010-01-26 11:40:00 +0000237 pr_debug("\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 sigd = vcc;
239 vcc->dev = &sigd_dev;
240 vcc_insert_socket(sk_atm(vcc));
Joe Perches0ec96e62010-01-26 11:40:17 +0000241 set_bit(ATM_VF_META, &vcc->flags);
242 set_bit(ATM_VF_READY, &vcc->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 return 0;
244}