diff options
Diffstat (limited to '')
| -rw-r--r-- | net/atm/signaling.c | 244 |
1 files changed, 244 insertions, 0 deletions
diff --git a/net/atm/signaling.c b/net/atm/signaling.c new file mode 100644 index 000000000..6c11cdf4d --- /dev/null +++ b/net/atm/signaling.c @@ -0,0 +1,244 @@ +// SPDX-License-Identifier: GPL-2.0 +/* net/atm/signaling.c - ATM signaling */ + +/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */ + +#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__ + +#include <linux/errno.h> /* error codes */ +#include <linux/kernel.h> /* printk */ +#include <linux/skbuff.h> +#include <linux/wait.h> +#include <linux/sched.h> /* jiffies and HZ */ +#include <linux/atm.h> /* ATM stuff */ +#include <linux/atmsap.h> +#include <linux/atmsvc.h> +#include <linux/atmdev.h> +#include <linux/bitops.h> +#include <linux/slab.h> + +#include "resources.h" +#include "signaling.h" + +struct atm_vcc *sigd = NULL; + +static void sigd_put_skb(struct sk_buff *skb) +{ + if (!sigd) { + pr_debug("atmsvc: no signaling daemon\n"); + kfree_skb(skb); + return; + } + atm_force_charge(sigd, skb->truesize); + skb_queue_tail(&sk_atm(sigd)->sk_receive_queue, skb); + sk_atm(sigd)->sk_data_ready(sk_atm(sigd)); +} + +static void modify_qos(struct atm_vcc *vcc, struct atmsvc_msg *msg) +{ + struct sk_buff *skb; + + if (test_bit(ATM_VF_RELEASED, &vcc->flags) || + !test_bit(ATM_VF_READY, &vcc->flags)) + return; + msg->type = as_error; + if (!vcc->dev->ops->change_qos) + msg->reply = -EOPNOTSUPP; + else { + /* should lock VCC */ + msg->reply = vcc->dev->ops->change_qos(vcc, &msg->qos, + msg->reply); + if (!msg->reply) + msg->type = as_okay; + } + /* + * Should probably just turn around the old skb. But the, the buffer + * space accounting needs to follow the change too. Maybe later. + */ + while (!(skb = alloc_skb(sizeof(struct atmsvc_msg), GFP_KERNEL))) + schedule(); + *(struct atmsvc_msg *)skb_put(skb, sizeof(struct atmsvc_msg)) = *msg; + sigd_put_skb(skb); +} + +static int sigd_send(struct atm_vcc *vcc, struct sk_buff *skb) +{ + struct atmsvc_msg *msg; + struct atm_vcc *session_vcc; + struct sock *sk; + + msg = (struct atmsvc_msg *) skb->data; + WARN_ON(refcount_sub_and_test(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc)); + vcc = *(struct atm_vcc **) &msg->vcc; + pr_debug("%d (0x%lx)\n", (int)msg->type, (unsigned long)vcc); + sk = sk_atm(vcc); + + switch (msg->type) { + case as_okay: + sk->sk_err = -msg->reply; + clear_bit(ATM_VF_WAITING, &vcc->flags); + if (!*vcc->local.sas_addr.prv && !*vcc->local.sas_addr.pub) { + vcc->local.sas_family = AF_ATMSVC; + memcpy(vcc->local.sas_addr.prv, + msg->local.sas_addr.prv, ATM_ESA_LEN); + memcpy(vcc->local.sas_addr.pub, + msg->local.sas_addr.pub, ATM_E164_LEN + 1); + } + session_vcc = vcc->session ? vcc->session : vcc; + if (session_vcc->vpi || session_vcc->vci) + break; + session_vcc->itf = msg->pvc.sap_addr.itf; + session_vcc->vpi = msg->pvc.sap_addr.vpi; + session_vcc->vci = msg->pvc.sap_addr.vci; + if (session_vcc->vpi || session_vcc->vci) + session_vcc->qos = msg->qos; + break; + case as_error: + clear_bit(ATM_VF_REGIS, &vcc->flags); + clear_bit(ATM_VF_READY, &vcc->flags); + sk->sk_err = -msg->reply; + clear_bit(ATM_VF_WAITING, &vcc->flags); + break; + case as_indicate: + vcc = *(struct atm_vcc **)&msg->listen_vcc; + sk = sk_atm(vcc); + pr_debug("as_indicate!!!\n"); + lock_sock(sk); + if (sk_acceptq_is_full(sk)) { + sigd_enq(NULL, as_reject, vcc, NULL, NULL); + dev_kfree_skb(skb); + goto as_indicate_complete; + } + sk->sk_ack_backlog++; + skb_queue_tail(&sk->sk_receive_queue, skb); + pr_debug("waking sk_sleep(sk) 0x%p\n", sk_sleep(sk)); + sk->sk_state_change(sk); +as_indicate_complete: + release_sock(sk); + return 0; + case as_close: + set_bit(ATM_VF_RELEASED, &vcc->flags); + vcc_release_async(vcc, msg->reply); + goto out; + case as_modify: + modify_qos(vcc, msg); + break; + case as_addparty: + case as_dropparty: + sk->sk_err_soft = -msg->reply; + /* < 0 failure, otherwise ep_ref */ + clear_bit(ATM_VF_WAITING, &vcc->flags); + break; + default: + pr_alert("bad message type %d\n", (int)msg->type); + return -EINVAL; + } + sk->sk_state_change(sk); +out: + dev_kfree_skb(skb); + return 0; +} + +void sigd_enq2(struct atm_vcc *vcc, enum atmsvc_msg_type type, + struct atm_vcc *listen_vcc, const struct sockaddr_atmpvc *pvc, + const struct sockaddr_atmsvc *svc, const struct atm_qos *qos, + int reply) +{ + struct sk_buff *skb; + struct atmsvc_msg *msg; + static unsigned int session = 0; + + pr_debug("%d (0x%p)\n", (int)type, vcc); + while (!(skb = alloc_skb(sizeof(struct atmsvc_msg), GFP_KERNEL))) + schedule(); + msg = skb_put_zero(skb, sizeof(struct atmsvc_msg)); + msg->type = type; + *(struct atm_vcc **) &msg->vcc = vcc; + *(struct atm_vcc **) &msg->listen_vcc = listen_vcc; + msg->reply = reply; + if (qos) + msg->qos = *qos; + if (vcc) + msg->sap = vcc->sap; + if (svc) + msg->svc = *svc; + if (vcc) + msg->local = vcc->local; + if (pvc) + msg->pvc = *pvc; + if (vcc) { + if (type == as_connect && test_bit(ATM_VF_SESSION, &vcc->flags)) + msg->session = ++session; + /* every new pmp connect gets the next session number */ + } + sigd_put_skb(skb); + if (vcc) + set_bit(ATM_VF_REGIS, &vcc->flags); +} + +void sigd_enq(struct atm_vcc *vcc, enum atmsvc_msg_type type, + struct atm_vcc *listen_vcc, const struct sockaddr_atmpvc *pvc, + const struct sockaddr_atmsvc *svc) +{ + sigd_enq2(vcc, type, listen_vcc, pvc, svc, vcc ? &vcc->qos : NULL, 0); + /* other ISP applications may use "reply" */ +} + +static void purge_vcc(struct atm_vcc *vcc) +{ + if (sk_atm(vcc)->sk_family == PF_ATMSVC && + !test_bit(ATM_VF_META, &vcc->flags)) { + set_bit(ATM_VF_RELEASED, &vcc->flags); + clear_bit(ATM_VF_REGIS, &vcc->flags); + vcc_release_async(vcc, -EUNATCH); + } +} + +static void sigd_close(struct atm_vcc *vcc) +{ + struct sock *s; + int i; + + pr_debug("\n"); + sigd = NULL; + if (skb_peek(&sk_atm(vcc)->sk_receive_queue)) + pr_err("closing with requests pending\n"); + skb_queue_purge(&sk_atm(vcc)->sk_receive_queue); + + read_lock(&vcc_sklist_lock); + for (i = 0; i < VCC_HTABLE_SIZE; ++i) { + struct hlist_head *head = &vcc_hash[i]; + + sk_for_each(s, head) { + vcc = atm_sk(s); + + purge_vcc(vcc); + } + } + read_unlock(&vcc_sklist_lock); +} + +static const struct atmdev_ops sigd_dev_ops = { + .close = sigd_close, + .send = sigd_send +}; + +static struct atm_dev sigd_dev = { + .ops = &sigd_dev_ops, + .type = "sig", + .number = 999, + .lock = __SPIN_LOCK_UNLOCKED(sigd_dev.lock) +}; + +int sigd_attach(struct atm_vcc *vcc) +{ + if (sigd) + return -EADDRINUSE; + pr_debug("\n"); + sigd = vcc; + vcc->dev = &sigd_dev; + vcc_insert_socket(sk_atm(vcc)); + set_bit(ATM_VF_META, &vcc->flags); + set_bit(ATM_VF_READY, &vcc->flags); + return 0; +} |