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692 lines
16 KiB
692 lines
16 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* net/atm/svc.c - ATM SVC sockets */ |
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|
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/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */ |
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|
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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_acceptq_removed(sk); |
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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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sockptr_t 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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|
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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_sockptr(&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 (copy_from_sockptr(&value, optval, sizeof(int))) { |
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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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|
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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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|
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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; |
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|
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lock_sock(sk); |
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if (!__SO_LEVEL_MATCH(optname, level) || optname != SO_ATMSAP) { |
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error = vcc_getsockopt(sock, level, optname, optval, optlen); |
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goto out; |
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} |
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if (get_user(len, optlen)) { |
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error = -EFAULT; |
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goto out; |
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} |
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if (len != 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_to_user(optval, &ATM_SD(sock)->sap, sizeof(struct atm_sap))) { |
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error = -EFAULT; |
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goto out; |
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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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|
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static int svc_addparty(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 atm_vcc *vcc = ATM_SD(sock); |
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int error; |
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|
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lock_sock(sk); |
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set_bit(ATM_VF_WAITING, &vcc->flags); |
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sigd_enq(vcc, as_addparty, NULL, NULL, |
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(struct sockaddr_atmsvc *) sockaddr); |
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if (flags & O_NONBLOCK) { |
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error = -EINPROGRESS; |
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goto out; |
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} |
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pr_debug("added wait queue\n"); |
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for (;;) { |
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prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
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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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error = -xchg(&sk->sk_err_soft, 0); |
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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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|
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static int svc_dropparty(struct socket *sock, int ep_ref) |
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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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|
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lock_sock(sk); |
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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); |
|
}
|
|
|