693 lines
16 KiB
C
693 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* net/atm/svc.c - ATM SVC sockets */
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/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
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#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
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#include <linux/string.h>
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#include <linux/net.h> /* struct socket, struct proto_ops */
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#include <linux/errno.h> /* error codes */
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#include <linux/kernel.h> /* printk */
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#include <linux/skbuff.h>
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#include <linux/wait.h>
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#include <linux/sched/signal.h>
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#include <linux/fcntl.h> /* O_NONBLOCK */
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#include <linux/init.h>
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#include <linux/atm.h> /* ATM stuff */
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#include <linux/atmsap.h>
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#include <linux/atmsvc.h>
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#include <linux/atmdev.h>
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#include <linux/bitops.h>
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#include <net/sock.h> /* for sock_no_* */
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#include <linux/uaccess.h>
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#include <linux/export.h>
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#include "resources.h"
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#include "common.h" /* common for PVCs and SVCs */
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#include "signaling.h"
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#include "addr.h"
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static int svc_create(struct net *net, struct socket *sock, int protocol,
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int kern);
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/*
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* Note: since all this is still nicely synchronized with the signaling demon,
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* there's no need to protect sleep loops with clis. If signaling is
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* moved into the kernel, that would change.
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*/
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static int svc_shutdown(struct socket *sock, int how)
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{
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return 0;
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}
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static void svc_disconnect(struct atm_vcc *vcc)
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{
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DEFINE_WAIT(wait);
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struct sk_buff *skb;
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struct sock *sk = sk_atm(vcc);
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pr_debug("%p\n", vcc);
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if (test_bit(ATM_VF_REGIS, &vcc->flags)) {
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sigd_enq(vcc, as_close, NULL, NULL, NULL);
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for (;;) {
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prepare_to_wait(sk_sleep(sk), &wait, TASK_UNINTERRUPTIBLE);
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if (test_bit(ATM_VF_RELEASED, &vcc->flags) || !sigd)
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break;
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schedule();
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}
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finish_wait(sk_sleep(sk), &wait);
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}
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/* beware - socket is still in use by atmsigd until the last
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as_indicate has been answered */
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while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
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atm_return(vcc, skb->truesize);
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pr_debug("LISTEN REL\n");
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sigd_enq2(NULL, as_reject, vcc, NULL, NULL, &vcc->qos, 0);
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dev_kfree_skb(skb);
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}
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clear_bit(ATM_VF_REGIS, &vcc->flags);
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/* ... may retry later */
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}
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static int svc_release(struct socket *sock)
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{
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struct sock *sk = sock->sk;
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struct atm_vcc *vcc;
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if (sk) {
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vcc = ATM_SD(sock);
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pr_debug("%p\n", vcc);
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clear_bit(ATM_VF_READY, &vcc->flags);
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/*
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* VCC pointer is used as a reference,
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* so we must not free it (thereby subjecting it to re-use)
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* before all pending connections are closed
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*/
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svc_disconnect(vcc);
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vcc_release(sock);
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}
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return 0;
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}
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static int svc_bind(struct socket *sock, struct sockaddr *sockaddr,
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int sockaddr_len)
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{
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DEFINE_WAIT(wait);
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struct sock *sk = sock->sk;
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struct sockaddr_atmsvc *addr;
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struct atm_vcc *vcc;
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int error;
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if (sockaddr_len != sizeof(struct sockaddr_atmsvc))
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return -EINVAL;
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lock_sock(sk);
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if (sock->state == SS_CONNECTED) {
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error = -EISCONN;
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goto out;
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}
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if (sock->state != SS_UNCONNECTED) {
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error = -EINVAL;
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goto out;
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}
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vcc = ATM_SD(sock);
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addr = (struct sockaddr_atmsvc *) sockaddr;
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if (addr->sas_family != AF_ATMSVC) {
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error = -EAFNOSUPPORT;
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goto out;
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}
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clear_bit(ATM_VF_BOUND, &vcc->flags);
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/* failing rebind will kill old binding */
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/* @@@ check memory (de)allocation on rebind */
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if (!test_bit(ATM_VF_HASQOS, &vcc->flags)) {
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error = -EBADFD;
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goto out;
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}
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vcc->local = *addr;
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set_bit(ATM_VF_WAITING, &vcc->flags);
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sigd_enq(vcc, as_bind, NULL, NULL, &vcc->local);
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for (;;) {
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prepare_to_wait(sk_sleep(sk), &wait, TASK_UNINTERRUPTIBLE);
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if (!test_bit(ATM_VF_WAITING, &vcc->flags) || !sigd)
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break;
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schedule();
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}
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finish_wait(sk_sleep(sk), &wait);
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clear_bit(ATM_VF_REGIS, &vcc->flags); /* doesn't count */
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if (!sigd) {
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error = -EUNATCH;
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goto out;
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}
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if (!sk->sk_err)
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set_bit(ATM_VF_BOUND, &vcc->flags);
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error = -sk->sk_err;
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out:
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release_sock(sk);
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return error;
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}
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static int svc_connect(struct socket *sock, struct sockaddr *sockaddr,
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int sockaddr_len, int flags)
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{
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DEFINE_WAIT(wait);
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struct sock *sk = sock->sk;
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struct sockaddr_atmsvc *addr;
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struct atm_vcc *vcc = ATM_SD(sock);
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int error;
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pr_debug("%p\n", vcc);
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lock_sock(sk);
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if (sockaddr_len != sizeof(struct sockaddr_atmsvc)) {
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error = -EINVAL;
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goto out;
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}
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switch (sock->state) {
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default:
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error = -EINVAL;
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goto out;
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case SS_CONNECTED:
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error = -EISCONN;
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goto out;
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case SS_CONNECTING:
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if (test_bit(ATM_VF_WAITING, &vcc->flags)) {
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error = -EALREADY;
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goto out;
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}
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sock->state = SS_UNCONNECTED;
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if (sk->sk_err) {
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error = -sk->sk_err;
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goto out;
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}
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break;
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case SS_UNCONNECTED:
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addr = (struct sockaddr_atmsvc *) sockaddr;
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if (addr->sas_family != AF_ATMSVC) {
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error = -EAFNOSUPPORT;
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goto out;
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}
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if (!test_bit(ATM_VF_HASQOS, &vcc->flags)) {
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error = -EBADFD;
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goto out;
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}
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if (vcc->qos.txtp.traffic_class == ATM_ANYCLASS ||
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vcc->qos.rxtp.traffic_class == ATM_ANYCLASS) {
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error = -EINVAL;
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goto out;
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}
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if (!vcc->qos.txtp.traffic_class &&
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!vcc->qos.rxtp.traffic_class) {
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error = -EINVAL;
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goto out;
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}
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vcc->remote = *addr;
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set_bit(ATM_VF_WAITING, &vcc->flags);
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sigd_enq(vcc, as_connect, NULL, NULL, &vcc->remote);
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if (flags & O_NONBLOCK) {
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sock->state = SS_CONNECTING;
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error = -EINPROGRESS;
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goto out;
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}
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error = 0;
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prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
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while (test_bit(ATM_VF_WAITING, &vcc->flags) && sigd) {
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schedule();
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if (!signal_pending(current)) {
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prepare_to_wait(sk_sleep(sk), &wait,
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TASK_INTERRUPTIBLE);
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continue;
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}
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pr_debug("*ABORT*\n");
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/*
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* This is tricky:
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* Kernel ---close--> Demon
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* Kernel <--close--- Demon
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* or
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* Kernel ---close--> Demon
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* Kernel <--error--- Demon
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* or
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* Kernel ---close--> Demon
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* Kernel <--okay---- Demon
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* Kernel <--close--- Demon
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*/
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sigd_enq(vcc, as_close, NULL, NULL, NULL);
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while (test_bit(ATM_VF_WAITING, &vcc->flags) && sigd) {
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prepare_to_wait(sk_sleep(sk), &wait,
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TASK_INTERRUPTIBLE);
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schedule();
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}
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if (!sk->sk_err)
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while (!test_bit(ATM_VF_RELEASED, &vcc->flags) &&
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sigd) {
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prepare_to_wait(sk_sleep(sk), &wait,
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TASK_INTERRUPTIBLE);
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schedule();
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}
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clear_bit(ATM_VF_REGIS, &vcc->flags);
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clear_bit(ATM_VF_RELEASED, &vcc->flags);
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clear_bit(ATM_VF_CLOSE, &vcc->flags);
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/* we're gone now but may connect later */
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error = -EINTR;
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break;
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}
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finish_wait(sk_sleep(sk), &wait);
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if (error)
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goto out;
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if (!sigd) {
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error = -EUNATCH;
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goto out;
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}
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if (sk->sk_err) {
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error = -sk->sk_err;
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goto out;
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}
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}
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vcc->qos.txtp.max_pcr = SELECT_TOP_PCR(vcc->qos.txtp);
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vcc->qos.txtp.pcr = 0;
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vcc->qos.txtp.min_pcr = 0;
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error = vcc_connect(sock, vcc->itf, vcc->vpi, vcc->vci);
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if (!error)
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sock->state = SS_CONNECTED;
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else
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(void)svc_disconnect(vcc);
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out:
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release_sock(sk);
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return error;
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}
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static int svc_listen(struct socket *sock, int backlog)
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{
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DEFINE_WAIT(wait);
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struct sock *sk = sock->sk;
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struct atm_vcc *vcc = ATM_SD(sock);
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int error;
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pr_debug("%p\n", vcc);
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lock_sock(sk);
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/* let server handle listen on unbound sockets */
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if (test_bit(ATM_VF_SESSION, &vcc->flags)) {
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error = -EINVAL;
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goto out;
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}
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if (test_bit(ATM_VF_LISTEN, &vcc->flags)) {
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error = -EADDRINUSE;
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goto out;
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}
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set_bit(ATM_VF_WAITING, &vcc->flags);
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sigd_enq(vcc, as_listen, NULL, NULL, &vcc->local);
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for (;;) {
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prepare_to_wait(sk_sleep(sk), &wait, TASK_UNINTERRUPTIBLE);
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if (!test_bit(ATM_VF_WAITING, &vcc->flags) || !sigd)
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break;
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schedule();
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}
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finish_wait(sk_sleep(sk), &wait);
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if (!sigd) {
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error = -EUNATCH;
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goto out;
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}
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set_bit(ATM_VF_LISTEN, &vcc->flags);
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vcc_insert_socket(sk);
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sk->sk_max_ack_backlog = backlog > 0 ? backlog : ATM_BACKLOG_DEFAULT;
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error = -sk->sk_err;
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out:
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release_sock(sk);
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return error;
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}
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static int svc_accept(struct socket *sock, struct socket *newsock, int flags,
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bool kern)
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{
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struct sock *sk = sock->sk;
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struct sk_buff *skb;
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struct atmsvc_msg *msg;
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struct atm_vcc *old_vcc = ATM_SD(sock);
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struct atm_vcc *new_vcc;
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int error;
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lock_sock(sk);
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error = svc_create(sock_net(sk), newsock, 0, kern);
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if (error)
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goto out;
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new_vcc = ATM_SD(newsock);
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pr_debug("%p -> %p\n", old_vcc, new_vcc);
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while (1) {
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DEFINE_WAIT(wait);
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prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
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while (!(skb = skb_dequeue(&sk->sk_receive_queue)) &&
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sigd) {
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if (test_bit(ATM_VF_RELEASED, &old_vcc->flags))
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break;
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if (test_bit(ATM_VF_CLOSE, &old_vcc->flags)) {
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error = -sk->sk_err;
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break;
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}
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if (flags & O_NONBLOCK) {
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error = -EAGAIN;
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break;
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}
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release_sock(sk);
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schedule();
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lock_sock(sk);
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if (signal_pending(current)) {
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error = -ERESTARTSYS;
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break;
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}
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prepare_to_wait(sk_sleep(sk), &wait,
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TASK_INTERRUPTIBLE);
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}
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finish_wait(sk_sleep(sk), &wait);
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if (error)
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goto out;
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if (!skb) {
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error = -EUNATCH;
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goto out;
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}
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msg = (struct atmsvc_msg *)skb->data;
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new_vcc->qos = msg->qos;
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set_bit(ATM_VF_HASQOS, &new_vcc->flags);
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new_vcc->remote = msg->svc;
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new_vcc->local = msg->local;
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new_vcc->sap = msg->sap;
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error = vcc_connect(newsock, msg->pvc.sap_addr.itf,
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msg->pvc.sap_addr.vpi,
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msg->pvc.sap_addr.vci);
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dev_kfree_skb(skb);
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sk->sk_ack_backlog--;
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if (error) {
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sigd_enq2(NULL, as_reject, old_vcc, NULL, NULL,
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&old_vcc->qos, error);
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error = error == -EAGAIN ? -EBUSY : error;
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goto out;
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}
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/* wait should be short, so we ignore the non-blocking flag */
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set_bit(ATM_VF_WAITING, &new_vcc->flags);
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sigd_enq(new_vcc, as_accept, old_vcc, NULL, NULL);
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for (;;) {
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prepare_to_wait(sk_sleep(sk_atm(new_vcc)), &wait,
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TASK_UNINTERRUPTIBLE);
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if (!test_bit(ATM_VF_WAITING, &new_vcc->flags) || !sigd)
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break;
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release_sock(sk);
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schedule();
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lock_sock(sk);
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}
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finish_wait(sk_sleep(sk_atm(new_vcc)), &wait);
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if (!sigd) {
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error = -EUNATCH;
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goto out;
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}
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if (!sk_atm(new_vcc)->sk_err)
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break;
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if (sk_atm(new_vcc)->sk_err != ERESTARTSYS) {
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error = -sk_atm(new_vcc)->sk_err;
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goto out;
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}
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}
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newsock->state = SS_CONNECTED;
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out:
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release_sock(sk);
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return error;
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}
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static int svc_getname(struct socket *sock, struct sockaddr *sockaddr,
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int peer)
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{
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struct sockaddr_atmsvc *addr;
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addr = (struct sockaddr_atmsvc *) sockaddr;
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memcpy(addr, peer ? &ATM_SD(sock)->remote : &ATM_SD(sock)->local,
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sizeof(struct sockaddr_atmsvc));
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return sizeof(struct sockaddr_atmsvc);
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}
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int svc_change_qos(struct atm_vcc *vcc, struct atm_qos *qos)
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{
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struct sock *sk = sk_atm(vcc);
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DEFINE_WAIT(wait);
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set_bit(ATM_VF_WAITING, &vcc->flags);
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sigd_enq2(vcc, as_modify, NULL, NULL, &vcc->local, qos, 0);
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for (;;) {
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prepare_to_wait(sk_sleep(sk), &wait, TASK_UNINTERRUPTIBLE);
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if (!test_bit(ATM_VF_WAITING, &vcc->flags) ||
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test_bit(ATM_VF_RELEASED, &vcc->flags) || !sigd) {
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break;
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}
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schedule();
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}
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finish_wait(sk_sleep(sk), &wait);
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if (!sigd)
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return -EUNATCH;
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return -sk->sk_err;
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}
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static int svc_setsockopt(struct socket *sock, int level, int optname,
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char __user *optval, unsigned int optlen)
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{
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struct sock *sk = sock->sk;
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struct atm_vcc *vcc = ATM_SD(sock);
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int value, error = 0;
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lock_sock(sk);
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switch (optname) {
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case SO_ATMSAP:
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if (level != SOL_ATM || optlen != sizeof(struct atm_sap)) {
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error = -EINVAL;
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goto out;
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}
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if (copy_from_user(&vcc->sap, optval, optlen)) {
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error = -EFAULT;
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goto out;
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}
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set_bit(ATM_VF_HASSAP, &vcc->flags);
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break;
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case SO_MULTIPOINT:
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if (level != SOL_ATM || optlen != sizeof(int)) {
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error = -EINVAL;
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goto out;
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}
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if (get_user(value, (int __user *)optval)) {
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error = -EFAULT;
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goto out;
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}
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if (value == 1)
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set_bit(ATM_VF_SESSION, &vcc->flags);
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else if (value == 0)
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clear_bit(ATM_VF_SESSION, &vcc->flags);
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else
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error = -EINVAL;
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break;
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default:
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error = vcc_setsockopt(sock, level, optname, optval, optlen);
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}
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out:
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release_sock(sk);
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return error;
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}
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static int svc_getsockopt(struct socket *sock, int level, int optname,
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char __user *optval, int __user *optlen)
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{
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struct sock *sk = sock->sk;
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int error = 0, len;
|
|
|
|
lock_sock(sk);
|
|
if (!__SO_LEVEL_MATCH(optname, level) || optname != SO_ATMSAP) {
|
|
error = vcc_getsockopt(sock, level, optname, optval, optlen);
|
|
goto out;
|
|
}
|
|
if (get_user(len, optlen)) {
|
|
error = -EFAULT;
|
|
goto out;
|
|
}
|
|
if (len != sizeof(struct atm_sap)) {
|
|
error = -EINVAL;
|
|
goto out;
|
|
}
|
|
if (copy_to_user(optval, &ATM_SD(sock)->sap, sizeof(struct atm_sap))) {
|
|
error = -EFAULT;
|
|
goto out;
|
|
}
|
|
out:
|
|
release_sock(sk);
|
|
return error;
|
|
}
|
|
|
|
static int svc_addparty(struct socket *sock, struct sockaddr *sockaddr,
|
|
int sockaddr_len, int flags)
|
|
{
|
|
DEFINE_WAIT(wait);
|
|
struct sock *sk = sock->sk;
|
|
struct atm_vcc *vcc = ATM_SD(sock);
|
|
int error;
|
|
|
|
lock_sock(sk);
|
|
set_bit(ATM_VF_WAITING, &vcc->flags);
|
|
sigd_enq(vcc, as_addparty, NULL, NULL,
|
|
(struct sockaddr_atmsvc *) sockaddr);
|
|
if (flags & O_NONBLOCK) {
|
|
error = -EINPROGRESS;
|
|
goto out;
|
|
}
|
|
pr_debug("added wait queue\n");
|
|
for (;;) {
|
|
prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
|
|
if (!test_bit(ATM_VF_WAITING, &vcc->flags) || !sigd)
|
|
break;
|
|
schedule();
|
|
}
|
|
finish_wait(sk_sleep(sk), &wait);
|
|
error = -xchg(&sk->sk_err_soft, 0);
|
|
out:
|
|
release_sock(sk);
|
|
return error;
|
|
}
|
|
|
|
static int svc_dropparty(struct socket *sock, int ep_ref)
|
|
{
|
|
DEFINE_WAIT(wait);
|
|
struct sock *sk = sock->sk;
|
|
struct atm_vcc *vcc = ATM_SD(sock);
|
|
int error;
|
|
|
|
lock_sock(sk);
|
|
set_bit(ATM_VF_WAITING, &vcc->flags);
|
|
sigd_enq2(vcc, as_dropparty, NULL, NULL, NULL, NULL, ep_ref);
|
|
for (;;) {
|
|
prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
|
|
if (!test_bit(ATM_VF_WAITING, &vcc->flags) || !sigd)
|
|
break;
|
|
schedule();
|
|
}
|
|
finish_wait(sk_sleep(sk), &wait);
|
|
if (!sigd) {
|
|
error = -EUNATCH;
|
|
goto out;
|
|
}
|
|
error = -xchg(&sk->sk_err_soft, 0);
|
|
out:
|
|
release_sock(sk);
|
|
return error;
|
|
}
|
|
|
|
static int svc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
|
|
{
|
|
int error, ep_ref;
|
|
struct sockaddr_atmsvc sa;
|
|
struct atm_vcc *vcc = ATM_SD(sock);
|
|
|
|
switch (cmd) {
|
|
case ATM_ADDPARTY:
|
|
if (!test_bit(ATM_VF_SESSION, &vcc->flags))
|
|
return -EINVAL;
|
|
if (copy_from_user(&sa, (void __user *) arg, sizeof(sa)))
|
|
return -EFAULT;
|
|
error = svc_addparty(sock, (struct sockaddr *)&sa, sizeof(sa),
|
|
0);
|
|
break;
|
|
case ATM_DROPPARTY:
|
|
if (!test_bit(ATM_VF_SESSION, &vcc->flags))
|
|
return -EINVAL;
|
|
if (copy_from_user(&ep_ref, (void __user *) arg, sizeof(int)))
|
|
return -EFAULT;
|
|
error = svc_dropparty(sock, ep_ref);
|
|
break;
|
|
default:
|
|
error = vcc_ioctl(sock, cmd, arg);
|
|
}
|
|
|
|
return error;
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
static int svc_compat_ioctl(struct socket *sock, unsigned int cmd,
|
|
unsigned long arg)
|
|
{
|
|
/* The definition of ATM_ADDPARTY uses the size of struct atm_iobuf.
|
|
But actually it takes a struct sockaddr_atmsvc, which doesn't need
|
|
compat handling. So all we have to do is fix up cmd... */
|
|
if (cmd == COMPAT_ATM_ADDPARTY)
|
|
cmd = ATM_ADDPARTY;
|
|
|
|
if (cmd == ATM_ADDPARTY || cmd == ATM_DROPPARTY)
|
|
return svc_ioctl(sock, cmd, arg);
|
|
else
|
|
return vcc_compat_ioctl(sock, cmd, arg);
|
|
}
|
|
#endif /* CONFIG_COMPAT */
|
|
|
|
static const struct proto_ops svc_proto_ops = {
|
|
.family = PF_ATMSVC,
|
|
.owner = THIS_MODULE,
|
|
|
|
.release = svc_release,
|
|
.bind = svc_bind,
|
|
.connect = svc_connect,
|
|
.socketpair = sock_no_socketpair,
|
|
.accept = svc_accept,
|
|
.getname = svc_getname,
|
|
.poll = vcc_poll,
|
|
.ioctl = svc_ioctl,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_ioctl = svc_compat_ioctl,
|
|
#endif
|
|
.gettstamp = sock_gettstamp,
|
|
.listen = svc_listen,
|
|
.shutdown = svc_shutdown,
|
|
.setsockopt = svc_setsockopt,
|
|
.getsockopt = svc_getsockopt,
|
|
.sendmsg = vcc_sendmsg,
|
|
.recvmsg = vcc_recvmsg,
|
|
.mmap = sock_no_mmap,
|
|
.sendpage = sock_no_sendpage,
|
|
};
|
|
|
|
|
|
static int svc_create(struct net *net, struct socket *sock, int protocol,
|
|
int kern)
|
|
{
|
|
int error;
|
|
|
|
if (!net_eq(net, &init_net))
|
|
return -EAFNOSUPPORT;
|
|
|
|
sock->ops = &svc_proto_ops;
|
|
error = vcc_create(net, sock, protocol, AF_ATMSVC, kern);
|
|
if (error)
|
|
return error;
|
|
ATM_SD(sock)->local.sas_family = AF_ATMSVC;
|
|
ATM_SD(sock)->remote.sas_family = AF_ATMSVC;
|
|
return 0;
|
|
}
|
|
|
|
static const struct net_proto_family svc_family_ops = {
|
|
.family = PF_ATMSVC,
|
|
.create = svc_create,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
|
|
/*
|
|
* Initialize the ATM SVC protocol family
|
|
*/
|
|
|
|
int __init atmsvc_init(void)
|
|
{
|
|
return sock_register(&svc_family_ops);
|
|
}
|
|
|
|
void atmsvc_exit(void)
|
|
{
|
|
sock_unregister(PF_ATMSVC);
|
|
}
|