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1841 lines
40 KiB
1841 lines
40 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* |
|
* X.25 Packet Layer release 002 |
|
* |
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* This is ALPHA test software. This code may break your machine, |
|
* randomly fail to work with new releases, misbehave and/or generally |
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* screw up. It might even work. |
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* |
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* This code REQUIRES 2.1.15 or higher |
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* |
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* History |
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* X.25 001 Jonathan Naylor Started coding. |
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* X.25 002 Jonathan Naylor Centralised disconnect handling. |
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* New timer architecture. |
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* 2000-03-11 Henner Eisen MSG_EOR handling more POSIX compliant. |
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* 2000-03-22 Daniela Squassoni Allowed disabling/enabling of |
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* facilities negotiation and increased |
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* the throughput upper limit. |
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* 2000-08-27 Arnaldo C. Melo s/suser/capable/ + micro cleanups |
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* 2000-09-04 Henner Eisen Set sock->state in x25_accept(). |
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* Fixed x25_output() related skb leakage. |
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* 2000-10-02 Henner Eisen Made x25_kick() single threaded per socket. |
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* 2000-10-27 Henner Eisen MSG_DONTWAIT for fragment allocation. |
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* 2000-11-14 Henner Eisen Closing datalink from NETDEV_GOING_DOWN |
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* 2002-10-06 Arnaldo C. Melo Get rid of cli/sti, move proc stuff to |
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* x25_proc.c, using seq_file |
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* 2005-04-02 Shaun Pereira Selective sub address matching |
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* with call user data |
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* 2005-04-15 Shaun Pereira Fast select with no restriction on |
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* response |
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*/ |
|
|
|
#define pr_fmt(fmt) "X25: " fmt |
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|
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#include <linux/module.h> |
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#include <linux/capability.h> |
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#include <linux/errno.h> |
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#include <linux/kernel.h> |
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#include <linux/sched/signal.h> |
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#include <linux/timer.h> |
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#include <linux/string.h> |
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#include <linux/net.h> |
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#include <linux/netdevice.h> |
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#include <linux/if_arp.h> |
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#include <linux/skbuff.h> |
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#include <linux/slab.h> |
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#include <net/sock.h> |
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#include <net/tcp_states.h> |
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#include <linux/uaccess.h> |
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#include <linux/fcntl.h> |
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#include <linux/termios.h> /* For TIOCINQ/OUTQ */ |
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#include <linux/notifier.h> |
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#include <linux/init.h> |
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#include <linux/compat.h> |
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#include <linux/ctype.h> |
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|
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#include <net/x25.h> |
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#include <net/compat.h> |
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|
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int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20; |
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int sysctl_x25_call_request_timeout = X25_DEFAULT_T21; |
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int sysctl_x25_reset_request_timeout = X25_DEFAULT_T22; |
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int sysctl_x25_clear_request_timeout = X25_DEFAULT_T23; |
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int sysctl_x25_ack_holdback_timeout = X25_DEFAULT_T2; |
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int sysctl_x25_forward = 0; |
|
|
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HLIST_HEAD(x25_list); |
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DEFINE_RWLOCK(x25_list_lock); |
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|
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static const struct proto_ops x25_proto_ops; |
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|
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static const struct x25_address null_x25_address = {" "}; |
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|
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#ifdef CONFIG_COMPAT |
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struct compat_x25_subscrip_struct { |
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char device[200-sizeof(compat_ulong_t)]; |
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compat_ulong_t global_facil_mask; |
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compat_uint_t extended; |
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}; |
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#endif |
|
|
|
|
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int x25_parse_address_block(struct sk_buff *skb, |
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struct x25_address *called_addr, |
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struct x25_address *calling_addr) |
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{ |
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unsigned char len; |
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int needed; |
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int rc; |
|
|
|
if (!pskb_may_pull(skb, 1)) { |
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/* packet has no address block */ |
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rc = 0; |
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goto empty; |
|
} |
|
|
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len = *skb->data; |
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needed = 1 + ((len >> 4) + (len & 0x0f) + 1) / 2; |
|
|
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if (!pskb_may_pull(skb, needed)) { |
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/* packet is too short to hold the addresses it claims |
|
to hold */ |
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rc = -1; |
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goto empty; |
|
} |
|
|
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return x25_addr_ntoa(skb->data, called_addr, calling_addr); |
|
|
|
empty: |
|
*called_addr->x25_addr = 0; |
|
*calling_addr->x25_addr = 0; |
|
|
|
return rc; |
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} |
|
|
|
|
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int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr, |
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struct x25_address *calling_addr) |
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{ |
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unsigned int called_len, calling_len; |
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char *called, *calling; |
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unsigned int i; |
|
|
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called_len = (*p >> 0) & 0x0F; |
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calling_len = (*p >> 4) & 0x0F; |
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|
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called = called_addr->x25_addr; |
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calling = calling_addr->x25_addr; |
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p++; |
|
|
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for (i = 0; i < (called_len + calling_len); i++) { |
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if (i < called_len) { |
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if (i % 2 != 0) { |
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*called++ = ((*p >> 0) & 0x0F) + '0'; |
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p++; |
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} else { |
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*called++ = ((*p >> 4) & 0x0F) + '0'; |
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} |
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} else { |
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if (i % 2 != 0) { |
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*calling++ = ((*p >> 0) & 0x0F) + '0'; |
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p++; |
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} else { |
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*calling++ = ((*p >> 4) & 0x0F) + '0'; |
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} |
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} |
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} |
|
|
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*called = *calling = '\0'; |
|
|
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return 1 + (called_len + calling_len + 1) / 2; |
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} |
|
|
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int x25_addr_aton(unsigned char *p, struct x25_address *called_addr, |
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struct x25_address *calling_addr) |
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{ |
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unsigned int called_len, calling_len; |
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char *called, *calling; |
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int i; |
|
|
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called = called_addr->x25_addr; |
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calling = calling_addr->x25_addr; |
|
|
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called_len = strlen(called); |
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calling_len = strlen(calling); |
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|
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*p++ = (calling_len << 4) | (called_len << 0); |
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|
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for (i = 0; i < (called_len + calling_len); i++) { |
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if (i < called_len) { |
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if (i % 2 != 0) { |
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*p |= (*called++ - '0') << 0; |
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p++; |
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} else { |
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*p = 0x00; |
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*p |= (*called++ - '0') << 4; |
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} |
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} else { |
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if (i % 2 != 0) { |
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*p |= (*calling++ - '0') << 0; |
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p++; |
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} else { |
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*p = 0x00; |
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*p |= (*calling++ - '0') << 4; |
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} |
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} |
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} |
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|
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return 1 + (called_len + calling_len + 1) / 2; |
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} |
|
|
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/* |
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* Socket removal during an interrupt is now safe. |
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*/ |
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static void x25_remove_socket(struct sock *sk) |
|
{ |
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write_lock_bh(&x25_list_lock); |
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sk_del_node_init(sk); |
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write_unlock_bh(&x25_list_lock); |
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} |
|
|
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/* |
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* Handle device status changes. |
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*/ |
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static int x25_device_event(struct notifier_block *this, unsigned long event, |
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void *ptr) |
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{ |
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struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
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struct x25_neigh *nb; |
|
|
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if (!net_eq(dev_net(dev), &init_net)) |
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return NOTIFY_DONE; |
|
|
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if (dev->type == ARPHRD_X25) { |
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switch (event) { |
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case NETDEV_REGISTER: |
|
case NETDEV_POST_TYPE_CHANGE: |
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x25_link_device_up(dev); |
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break; |
|
case NETDEV_DOWN: |
|
nb = x25_get_neigh(dev); |
|
if (nb) { |
|
x25_link_terminated(nb); |
|
x25_neigh_put(nb); |
|
} |
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x25_route_device_down(dev); |
|
break; |
|
case NETDEV_PRE_TYPE_CHANGE: |
|
case NETDEV_UNREGISTER: |
|
x25_link_device_down(dev); |
|
break; |
|
case NETDEV_CHANGE: |
|
if (!netif_carrier_ok(dev)) { |
|
nb = x25_get_neigh(dev); |
|
if (nb) { |
|
x25_link_terminated(nb); |
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x25_neigh_put(nb); |
|
} |
|
} |
|
break; |
|
} |
|
} |
|
|
|
return NOTIFY_DONE; |
|
} |
|
|
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/* |
|
* Add a socket to the bound sockets list. |
|
*/ |
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static void x25_insert_socket(struct sock *sk) |
|
{ |
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write_lock_bh(&x25_list_lock); |
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sk_add_node(sk, &x25_list); |
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write_unlock_bh(&x25_list_lock); |
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} |
|
|
|
/* |
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* Find a socket that wants to accept the Call Request we just |
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* received. Check the full list for an address/cud match. |
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* If no cuds match return the next_best thing, an address match. |
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* Note: if a listening socket has cud set it must only get calls |
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* with matching cud. |
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*/ |
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static struct sock *x25_find_listener(struct x25_address *addr, |
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struct sk_buff *skb) |
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{ |
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struct sock *s; |
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struct sock *next_best; |
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|
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read_lock_bh(&x25_list_lock); |
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next_best = NULL; |
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|
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sk_for_each(s, &x25_list) |
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if ((!strcmp(addr->x25_addr, |
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x25_sk(s)->source_addr.x25_addr) || |
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!strcmp(x25_sk(s)->source_addr.x25_addr, |
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null_x25_address.x25_addr)) && |
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s->sk_state == TCP_LISTEN) { |
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/* |
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* Found a listening socket, now check the incoming |
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* call user data vs this sockets call user data |
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*/ |
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if (x25_sk(s)->cudmatchlength > 0 && |
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skb->len >= x25_sk(s)->cudmatchlength) { |
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if((memcmp(x25_sk(s)->calluserdata.cuddata, |
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skb->data, |
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x25_sk(s)->cudmatchlength)) == 0) { |
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sock_hold(s); |
|
goto found; |
|
} |
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} else |
|
next_best = s; |
|
} |
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if (next_best) { |
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s = next_best; |
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sock_hold(s); |
|
goto found; |
|
} |
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s = NULL; |
|
found: |
|
read_unlock_bh(&x25_list_lock); |
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return s; |
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} |
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|
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/* |
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* Find a connected X.25 socket given my LCI and neighbour. |
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*/ |
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static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb) |
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{ |
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struct sock *s; |
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|
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sk_for_each(s, &x25_list) |
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if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) { |
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sock_hold(s); |
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goto found; |
|
} |
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s = NULL; |
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found: |
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return s; |
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} |
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|
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struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb) |
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{ |
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struct sock *s; |
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|
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read_lock_bh(&x25_list_lock); |
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s = __x25_find_socket(lci, nb); |
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read_unlock_bh(&x25_list_lock); |
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return s; |
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} |
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|
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/* |
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* Find a unique LCI for a given device. |
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*/ |
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static unsigned int x25_new_lci(struct x25_neigh *nb) |
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{ |
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unsigned int lci = 1; |
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struct sock *sk; |
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|
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while ((sk = x25_find_socket(lci, nb)) != NULL) { |
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sock_put(sk); |
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if (++lci == 4096) { |
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lci = 0; |
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break; |
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} |
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cond_resched(); |
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} |
|
|
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return lci; |
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} |
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|
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/* |
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* Deferred destroy. |
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*/ |
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static void __x25_destroy_socket(struct sock *); |
|
|
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/* |
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* handler for deferred kills. |
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*/ |
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static void x25_destroy_timer(struct timer_list *t) |
|
{ |
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struct sock *sk = from_timer(sk, t, sk_timer); |
|
|
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x25_destroy_socket_from_timer(sk); |
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} |
|
|
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/* |
|
* This is called from user mode and the timers. Thus it protects itself |
|
* against interrupt users but doesn't worry about being called during |
|
* work. Once it is removed from the queue no interrupt or bottom half |
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* will touch it and we are (fairly 8-) ) safe. |
|
* Not static as it's used by the timer |
|
*/ |
|
static void __x25_destroy_socket(struct sock *sk) |
|
{ |
|
struct sk_buff *skb; |
|
|
|
x25_stop_heartbeat(sk); |
|
x25_stop_timer(sk); |
|
|
|
x25_remove_socket(sk); |
|
x25_clear_queues(sk); /* Flush the queues */ |
|
|
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while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { |
|
if (skb->sk != sk) { /* A pending connection */ |
|
/* |
|
* Queue the unaccepted socket for death |
|
*/ |
|
skb->sk->sk_state = TCP_LISTEN; |
|
sock_set_flag(skb->sk, SOCK_DEAD); |
|
x25_start_heartbeat(skb->sk); |
|
x25_sk(skb->sk)->state = X25_STATE_0; |
|
} |
|
|
|
kfree_skb(skb); |
|
} |
|
|
|
if (sk_has_allocations(sk)) { |
|
/* Defer: outstanding buffers */ |
|
sk->sk_timer.expires = jiffies + 10 * HZ; |
|
sk->sk_timer.function = x25_destroy_timer; |
|
add_timer(&sk->sk_timer); |
|
} else { |
|
/* drop last reference so sock_put will free */ |
|
__sock_put(sk); |
|
} |
|
} |
|
|
|
void x25_destroy_socket_from_timer(struct sock *sk) |
|
{ |
|
sock_hold(sk); |
|
bh_lock_sock(sk); |
|
__x25_destroy_socket(sk); |
|
bh_unlock_sock(sk); |
|
sock_put(sk); |
|
} |
|
|
|
/* |
|
* Handling for system calls applied via the various interfaces to a |
|
* X.25 socket object. |
|
*/ |
|
|
|
static int x25_setsockopt(struct socket *sock, int level, int optname, |
|
sockptr_t optval, unsigned int optlen) |
|
{ |
|
int opt; |
|
struct sock *sk = sock->sk; |
|
int rc = -ENOPROTOOPT; |
|
|
|
if (level != SOL_X25 || optname != X25_QBITINCL) |
|
goto out; |
|
|
|
rc = -EINVAL; |
|
if (optlen < sizeof(int)) |
|
goto out; |
|
|
|
rc = -EFAULT; |
|
if (copy_from_sockptr(&opt, optval, sizeof(int))) |
|
goto out; |
|
|
|
if (opt) |
|
set_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags); |
|
else |
|
clear_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags); |
|
rc = 0; |
|
out: |
|
return rc; |
|
} |
|
|
|
static int x25_getsockopt(struct socket *sock, int level, int optname, |
|
char __user *optval, int __user *optlen) |
|
{ |
|
struct sock *sk = sock->sk; |
|
int val, len, rc = -ENOPROTOOPT; |
|
|
|
if (level != SOL_X25 || optname != X25_QBITINCL) |
|
goto out; |
|
|
|
rc = -EFAULT; |
|
if (get_user(len, optlen)) |
|
goto out; |
|
|
|
len = min_t(unsigned int, len, sizeof(int)); |
|
|
|
rc = -EINVAL; |
|
if (len < 0) |
|
goto out; |
|
|
|
rc = -EFAULT; |
|
if (put_user(len, optlen)) |
|
goto out; |
|
|
|
val = test_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags); |
|
rc = copy_to_user(optval, &val, len) ? -EFAULT : 0; |
|
out: |
|
return rc; |
|
} |
|
|
|
static int x25_listen(struct socket *sock, int backlog) |
|
{ |
|
struct sock *sk = sock->sk; |
|
int rc = -EOPNOTSUPP; |
|
|
|
lock_sock(sk); |
|
if (sk->sk_state != TCP_LISTEN) { |
|
memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN); |
|
sk->sk_max_ack_backlog = backlog; |
|
sk->sk_state = TCP_LISTEN; |
|
rc = 0; |
|
} |
|
release_sock(sk); |
|
|
|
return rc; |
|
} |
|
|
|
static struct proto x25_proto = { |
|
.name = "X25", |
|
.owner = THIS_MODULE, |
|
.obj_size = sizeof(struct x25_sock), |
|
}; |
|
|
|
static struct sock *x25_alloc_socket(struct net *net, int kern) |
|
{ |
|
struct x25_sock *x25; |
|
struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto, kern); |
|
|
|
if (!sk) |
|
goto out; |
|
|
|
sock_init_data(NULL, sk); |
|
|
|
x25 = x25_sk(sk); |
|
skb_queue_head_init(&x25->ack_queue); |
|
skb_queue_head_init(&x25->fragment_queue); |
|
skb_queue_head_init(&x25->interrupt_in_queue); |
|
skb_queue_head_init(&x25->interrupt_out_queue); |
|
out: |
|
return sk; |
|
} |
|
|
|
static int x25_create(struct net *net, struct socket *sock, int protocol, |
|
int kern) |
|
{ |
|
struct sock *sk; |
|
struct x25_sock *x25; |
|
int rc = -EAFNOSUPPORT; |
|
|
|
if (!net_eq(net, &init_net)) |
|
goto out; |
|
|
|
rc = -ESOCKTNOSUPPORT; |
|
if (sock->type != SOCK_SEQPACKET) |
|
goto out; |
|
|
|
rc = -EINVAL; |
|
if (protocol) |
|
goto out; |
|
|
|
rc = -ENOBUFS; |
|
if ((sk = x25_alloc_socket(net, kern)) == NULL) |
|
goto out; |
|
|
|
x25 = x25_sk(sk); |
|
|
|
sock_init_data(sock, sk); |
|
|
|
x25_init_timers(sk); |
|
|
|
sock->ops = &x25_proto_ops; |
|
sk->sk_protocol = protocol; |
|
sk->sk_backlog_rcv = x25_backlog_rcv; |
|
|
|
x25->t21 = sysctl_x25_call_request_timeout; |
|
x25->t22 = sysctl_x25_reset_request_timeout; |
|
x25->t23 = sysctl_x25_clear_request_timeout; |
|
x25->t2 = sysctl_x25_ack_holdback_timeout; |
|
x25->state = X25_STATE_0; |
|
x25->cudmatchlength = 0; |
|
set_bit(X25_ACCPT_APPRV_FLAG, &x25->flags); /* normally no cud */ |
|
/* on call accept */ |
|
|
|
x25->facilities.winsize_in = X25_DEFAULT_WINDOW_SIZE; |
|
x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE; |
|
x25->facilities.pacsize_in = X25_DEFAULT_PACKET_SIZE; |
|
x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE; |
|
x25->facilities.throughput = 0; /* by default don't negotiate |
|
throughput */ |
|
x25->facilities.reverse = X25_DEFAULT_REVERSE; |
|
x25->dte_facilities.calling_len = 0; |
|
x25->dte_facilities.called_len = 0; |
|
memset(x25->dte_facilities.called_ae, '\0', |
|
sizeof(x25->dte_facilities.called_ae)); |
|
memset(x25->dte_facilities.calling_ae, '\0', |
|
sizeof(x25->dte_facilities.calling_ae)); |
|
|
|
rc = 0; |
|
out: |
|
return rc; |
|
} |
|
|
|
static struct sock *x25_make_new(struct sock *osk) |
|
{ |
|
struct sock *sk = NULL; |
|
struct x25_sock *x25, *ox25; |
|
|
|
if (osk->sk_type != SOCK_SEQPACKET) |
|
goto out; |
|
|
|
if ((sk = x25_alloc_socket(sock_net(osk), 0)) == NULL) |
|
goto out; |
|
|
|
x25 = x25_sk(sk); |
|
|
|
sk->sk_type = osk->sk_type; |
|
sk->sk_priority = osk->sk_priority; |
|
sk->sk_protocol = osk->sk_protocol; |
|
sk->sk_rcvbuf = osk->sk_rcvbuf; |
|
sk->sk_sndbuf = osk->sk_sndbuf; |
|
sk->sk_state = TCP_ESTABLISHED; |
|
sk->sk_backlog_rcv = osk->sk_backlog_rcv; |
|
sock_copy_flags(sk, osk); |
|
|
|
ox25 = x25_sk(osk); |
|
x25->t21 = ox25->t21; |
|
x25->t22 = ox25->t22; |
|
x25->t23 = ox25->t23; |
|
x25->t2 = ox25->t2; |
|
x25->flags = ox25->flags; |
|
x25->facilities = ox25->facilities; |
|
x25->dte_facilities = ox25->dte_facilities; |
|
x25->cudmatchlength = ox25->cudmatchlength; |
|
|
|
clear_bit(X25_INTERRUPT_FLAG, &x25->flags); |
|
x25_init_timers(sk); |
|
out: |
|
return sk; |
|
} |
|
|
|
static int x25_release(struct socket *sock) |
|
{ |
|
struct sock *sk = sock->sk; |
|
struct x25_sock *x25; |
|
|
|
if (!sk) |
|
return 0; |
|
|
|
x25 = x25_sk(sk); |
|
|
|
sock_hold(sk); |
|
lock_sock(sk); |
|
switch (x25->state) { |
|
|
|
case X25_STATE_0: |
|
case X25_STATE_2: |
|
x25_disconnect(sk, 0, 0, 0); |
|
__x25_destroy_socket(sk); |
|
goto out; |
|
|
|
case X25_STATE_1: |
|
case X25_STATE_3: |
|
case X25_STATE_4: |
|
x25_clear_queues(sk); |
|
x25_write_internal(sk, X25_CLEAR_REQUEST); |
|
x25_start_t23timer(sk); |
|
x25->state = X25_STATE_2; |
|
sk->sk_state = TCP_CLOSE; |
|
sk->sk_shutdown |= SEND_SHUTDOWN; |
|
sk->sk_state_change(sk); |
|
sock_set_flag(sk, SOCK_DEAD); |
|
sock_set_flag(sk, SOCK_DESTROY); |
|
break; |
|
|
|
case X25_STATE_5: |
|
x25_write_internal(sk, X25_CLEAR_REQUEST); |
|
x25_disconnect(sk, 0, 0, 0); |
|
__x25_destroy_socket(sk); |
|
goto out; |
|
} |
|
|
|
sock_orphan(sk); |
|
out: |
|
release_sock(sk); |
|
sock_put(sk); |
|
return 0; |
|
} |
|
|
|
static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) |
|
{ |
|
struct sock *sk = sock->sk; |
|
struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr; |
|
int len, i, rc = 0; |
|
|
|
if (addr_len != sizeof(struct sockaddr_x25) || |
|
addr->sx25_family != AF_X25 || |
|
strnlen(addr->sx25_addr.x25_addr, X25_ADDR_LEN) == X25_ADDR_LEN) { |
|
rc = -EINVAL; |
|
goto out; |
|
} |
|
|
|
/* check for the null_x25_address */ |
|
if (strcmp(addr->sx25_addr.x25_addr, null_x25_address.x25_addr)) { |
|
|
|
len = strlen(addr->sx25_addr.x25_addr); |
|
for (i = 0; i < len; i++) { |
|
if (!isdigit(addr->sx25_addr.x25_addr[i])) { |
|
rc = -EINVAL; |
|
goto out; |
|
} |
|
} |
|
} |
|
|
|
lock_sock(sk); |
|
if (sock_flag(sk, SOCK_ZAPPED)) { |
|
x25_sk(sk)->source_addr = addr->sx25_addr; |
|
x25_insert_socket(sk); |
|
sock_reset_flag(sk, SOCK_ZAPPED); |
|
} else { |
|
rc = -EINVAL; |
|
} |
|
release_sock(sk); |
|
SOCK_DEBUG(sk, "x25_bind: socket is bound\n"); |
|
out: |
|
return rc; |
|
} |
|
|
|
static int x25_wait_for_connection_establishment(struct sock *sk) |
|
{ |
|
DECLARE_WAITQUEUE(wait, current); |
|
int rc; |
|
|
|
add_wait_queue_exclusive(sk_sleep(sk), &wait); |
|
for (;;) { |
|
__set_current_state(TASK_INTERRUPTIBLE); |
|
rc = -ERESTARTSYS; |
|
if (signal_pending(current)) |
|
break; |
|
rc = sock_error(sk); |
|
if (rc) { |
|
sk->sk_socket->state = SS_UNCONNECTED; |
|
break; |
|
} |
|
rc = 0; |
|
if (sk->sk_state != TCP_ESTABLISHED) { |
|
release_sock(sk); |
|
schedule(); |
|
lock_sock(sk); |
|
} else |
|
break; |
|
} |
|
__set_current_state(TASK_RUNNING); |
|
remove_wait_queue(sk_sleep(sk), &wait); |
|
return rc; |
|
} |
|
|
|
static int x25_connect(struct socket *sock, struct sockaddr *uaddr, |
|
int addr_len, int flags) |
|
{ |
|
struct sock *sk = sock->sk; |
|
struct x25_sock *x25 = x25_sk(sk); |
|
struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr; |
|
struct x25_route *rt; |
|
int rc = 0; |
|
|
|
lock_sock(sk); |
|
if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) { |
|
sock->state = SS_CONNECTED; |
|
goto out; /* Connect completed during a ERESTARTSYS event */ |
|
} |
|
|
|
rc = -ECONNREFUSED; |
|
if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) { |
|
sock->state = SS_UNCONNECTED; |
|
goto out; |
|
} |
|
|
|
rc = -EISCONN; /* No reconnect on a seqpacket socket */ |
|
if (sk->sk_state == TCP_ESTABLISHED) |
|
goto out; |
|
|
|
rc = -EALREADY; /* Do nothing if call is already in progress */ |
|
if (sk->sk_state == TCP_SYN_SENT) |
|
goto out; |
|
|
|
sk->sk_state = TCP_CLOSE; |
|
sock->state = SS_UNCONNECTED; |
|
|
|
rc = -EINVAL; |
|
if (addr_len != sizeof(struct sockaddr_x25) || |
|
addr->sx25_family != AF_X25 || |
|
strnlen(addr->sx25_addr.x25_addr, X25_ADDR_LEN) == X25_ADDR_LEN) |
|
goto out; |
|
|
|
rc = -ENETUNREACH; |
|
rt = x25_get_route(&addr->sx25_addr); |
|
if (!rt) |
|
goto out; |
|
|
|
x25->neighbour = x25_get_neigh(rt->dev); |
|
if (!x25->neighbour) |
|
goto out_put_route; |
|
|
|
x25_limit_facilities(&x25->facilities, x25->neighbour); |
|
|
|
x25->lci = x25_new_lci(x25->neighbour); |
|
if (!x25->lci) |
|
goto out_put_neigh; |
|
|
|
rc = -EINVAL; |
|
if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */ |
|
goto out_put_neigh; |
|
|
|
if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr)) |
|
memset(&x25->source_addr, '\0', X25_ADDR_LEN); |
|
|
|
x25->dest_addr = addr->sx25_addr; |
|
|
|
/* Move to connecting socket, start sending Connect Requests */ |
|
sock->state = SS_CONNECTING; |
|
sk->sk_state = TCP_SYN_SENT; |
|
|
|
x25->state = X25_STATE_1; |
|
|
|
x25_write_internal(sk, X25_CALL_REQUEST); |
|
|
|
x25_start_heartbeat(sk); |
|
x25_start_t21timer(sk); |
|
|
|
/* Now the loop */ |
|
rc = -EINPROGRESS; |
|
if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) |
|
goto out; |
|
|
|
rc = x25_wait_for_connection_establishment(sk); |
|
if (rc) |
|
goto out_put_neigh; |
|
|
|
sock->state = SS_CONNECTED; |
|
rc = 0; |
|
out_put_neigh: |
|
if (rc && x25->neighbour) { |
|
read_lock_bh(&x25_list_lock); |
|
x25_neigh_put(x25->neighbour); |
|
x25->neighbour = NULL; |
|
read_unlock_bh(&x25_list_lock); |
|
x25->state = X25_STATE_0; |
|
} |
|
out_put_route: |
|
x25_route_put(rt); |
|
out: |
|
release_sock(sk); |
|
return rc; |
|
} |
|
|
|
static int x25_wait_for_data(struct sock *sk, long timeout) |
|
{ |
|
DECLARE_WAITQUEUE(wait, current); |
|
int rc = 0; |
|
|
|
add_wait_queue_exclusive(sk_sleep(sk), &wait); |
|
for (;;) { |
|
__set_current_state(TASK_INTERRUPTIBLE); |
|
if (sk->sk_shutdown & RCV_SHUTDOWN) |
|
break; |
|
rc = -ERESTARTSYS; |
|
if (signal_pending(current)) |
|
break; |
|
rc = -EAGAIN; |
|
if (!timeout) |
|
break; |
|
rc = 0; |
|
if (skb_queue_empty(&sk->sk_receive_queue)) { |
|
release_sock(sk); |
|
timeout = schedule_timeout(timeout); |
|
lock_sock(sk); |
|
} else |
|
break; |
|
} |
|
__set_current_state(TASK_RUNNING); |
|
remove_wait_queue(sk_sleep(sk), &wait); |
|
return rc; |
|
} |
|
|
|
static int x25_accept(struct socket *sock, struct socket *newsock, int flags, |
|
bool kern) |
|
{ |
|
struct sock *sk = sock->sk; |
|
struct sock *newsk; |
|
struct sk_buff *skb; |
|
int rc = -EINVAL; |
|
|
|
if (!sk) |
|
goto out; |
|
|
|
rc = -EOPNOTSUPP; |
|
if (sk->sk_type != SOCK_SEQPACKET) |
|
goto out; |
|
|
|
lock_sock(sk); |
|
rc = -EINVAL; |
|
if (sk->sk_state != TCP_LISTEN) |
|
goto out2; |
|
|
|
rc = x25_wait_for_data(sk, sk->sk_rcvtimeo); |
|
if (rc) |
|
goto out2; |
|
skb = skb_dequeue(&sk->sk_receive_queue); |
|
rc = -EINVAL; |
|
if (!skb->sk) |
|
goto out2; |
|
newsk = skb->sk; |
|
sock_graft(newsk, newsock); |
|
|
|
/* Now attach up the new socket */ |
|
skb->sk = NULL; |
|
kfree_skb(skb); |
|
sk_acceptq_removed(sk); |
|
newsock->state = SS_CONNECTED; |
|
rc = 0; |
|
out2: |
|
release_sock(sk); |
|
out: |
|
return rc; |
|
} |
|
|
|
static int x25_getname(struct socket *sock, struct sockaddr *uaddr, |
|
int peer) |
|
{ |
|
struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr; |
|
struct sock *sk = sock->sk; |
|
struct x25_sock *x25 = x25_sk(sk); |
|
int rc = 0; |
|
|
|
if (peer) { |
|
if (sk->sk_state != TCP_ESTABLISHED) { |
|
rc = -ENOTCONN; |
|
goto out; |
|
} |
|
sx25->sx25_addr = x25->dest_addr; |
|
} else |
|
sx25->sx25_addr = x25->source_addr; |
|
|
|
sx25->sx25_family = AF_X25; |
|
rc = sizeof(*sx25); |
|
|
|
out: |
|
return rc; |
|
} |
|
|
|
int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb, |
|
unsigned int lci) |
|
{ |
|
struct sock *sk; |
|
struct sock *make; |
|
struct x25_sock *makex25; |
|
struct x25_address source_addr, dest_addr; |
|
struct x25_facilities facilities; |
|
struct x25_dte_facilities dte_facilities; |
|
int len, addr_len, rc; |
|
|
|
/* |
|
* Remove the LCI and frame type. |
|
*/ |
|
skb_pull(skb, X25_STD_MIN_LEN); |
|
|
|
/* |
|
* Extract the X.25 addresses and convert them to ASCII strings, |
|
* and remove them. |
|
* |
|
* Address block is mandatory in call request packets |
|
*/ |
|
addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr); |
|
if (addr_len <= 0) |
|
goto out_clear_request; |
|
skb_pull(skb, addr_len); |
|
|
|
/* |
|
* Get the length of the facilities, skip past them for the moment |
|
* get the call user data because this is needed to determine |
|
* the correct listener |
|
* |
|
* Facilities length is mandatory in call request packets |
|
*/ |
|
if (!pskb_may_pull(skb, 1)) |
|
goto out_clear_request; |
|
len = skb->data[0] + 1; |
|
if (!pskb_may_pull(skb, len)) |
|
goto out_clear_request; |
|
skb_pull(skb,len); |
|
|
|
/* |
|
* Ensure that the amount of call user data is valid. |
|
*/ |
|
if (skb->len > X25_MAX_CUD_LEN) |
|
goto out_clear_request; |
|
|
|
/* |
|
* Get all the call user data so it can be used in |
|
* x25_find_listener and skb_copy_from_linear_data up ahead. |
|
*/ |
|
if (!pskb_may_pull(skb, skb->len)) |
|
goto out_clear_request; |
|
|
|
/* |
|
* Find a listener for the particular address/cud pair. |
|
*/ |
|
sk = x25_find_listener(&source_addr,skb); |
|
skb_push(skb,len); |
|
|
|
if (sk != NULL && sk_acceptq_is_full(sk)) { |
|
goto out_sock_put; |
|
} |
|
|
|
/* |
|
* We dont have any listeners for this incoming call. |
|
* Try forwarding it. |
|
*/ |
|
if (sk == NULL) { |
|
skb_push(skb, addr_len + X25_STD_MIN_LEN); |
|
if (sysctl_x25_forward && |
|
x25_forward_call(&dest_addr, nb, skb, lci) > 0) |
|
{ |
|
/* Call was forwarded, dont process it any more */ |
|
kfree_skb(skb); |
|
rc = 1; |
|
goto out; |
|
} else { |
|
/* No listeners, can't forward, clear the call */ |
|
goto out_clear_request; |
|
} |
|
} |
|
|
|
/* |
|
* Try to reach a compromise on the requested facilities. |
|
*/ |
|
len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities); |
|
if (len == -1) |
|
goto out_sock_put; |
|
|
|
/* |
|
* current neighbour/link might impose additional limits |
|
* on certain facilties |
|
*/ |
|
|
|
x25_limit_facilities(&facilities, nb); |
|
|
|
/* |
|
* Try to create a new socket. |
|
*/ |
|
make = x25_make_new(sk); |
|
if (!make) |
|
goto out_sock_put; |
|
|
|
/* |
|
* Remove the facilities |
|
*/ |
|
skb_pull(skb, len); |
|
|
|
skb->sk = make; |
|
make->sk_state = TCP_ESTABLISHED; |
|
|
|
makex25 = x25_sk(make); |
|
makex25->lci = lci; |
|
makex25->dest_addr = dest_addr; |
|
makex25->source_addr = source_addr; |
|
x25_neigh_hold(nb); |
|
makex25->neighbour = nb; |
|
makex25->facilities = facilities; |
|
makex25->dte_facilities= dte_facilities; |
|
makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask; |
|
/* ensure no reverse facil on accept */ |
|
makex25->vc_facil_mask &= ~X25_MASK_REVERSE; |
|
/* ensure no calling address extension on accept */ |
|
makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE; |
|
makex25->cudmatchlength = x25_sk(sk)->cudmatchlength; |
|
|
|
/* Normally all calls are accepted immediately */ |
|
if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) { |
|
x25_write_internal(make, X25_CALL_ACCEPTED); |
|
makex25->state = X25_STATE_3; |
|
} else { |
|
makex25->state = X25_STATE_5; |
|
} |
|
|
|
/* |
|
* Incoming Call User Data. |
|
*/ |
|
skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len); |
|
makex25->calluserdata.cudlength = skb->len; |
|
|
|
sk_acceptq_added(sk); |
|
|
|
x25_insert_socket(make); |
|
|
|
skb_queue_head(&sk->sk_receive_queue, skb); |
|
|
|
x25_start_heartbeat(make); |
|
|
|
if (!sock_flag(sk, SOCK_DEAD)) |
|
sk->sk_data_ready(sk); |
|
rc = 1; |
|
sock_put(sk); |
|
out: |
|
return rc; |
|
out_sock_put: |
|
sock_put(sk); |
|
out_clear_request: |
|
rc = 0; |
|
x25_transmit_clear_request(nb, lci, 0x01); |
|
goto out; |
|
} |
|
|
|
static int x25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) |
|
{ |
|
struct sock *sk = sock->sk; |
|
struct x25_sock *x25 = x25_sk(sk); |
|
DECLARE_SOCKADDR(struct sockaddr_x25 *, usx25, msg->msg_name); |
|
struct sockaddr_x25 sx25; |
|
struct sk_buff *skb; |
|
unsigned char *asmptr; |
|
int noblock = msg->msg_flags & MSG_DONTWAIT; |
|
size_t size; |
|
int qbit = 0, rc = -EINVAL; |
|
|
|
lock_sock(sk); |
|
if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT)) |
|
goto out; |
|
|
|
/* we currently don't support segmented records at the user interface */ |
|
if (!(msg->msg_flags & (MSG_EOR|MSG_OOB))) |
|
goto out; |
|
|
|
rc = -EADDRNOTAVAIL; |
|
if (sock_flag(sk, SOCK_ZAPPED)) |
|
goto out; |
|
|
|
rc = -EPIPE; |
|
if (sk->sk_shutdown & SEND_SHUTDOWN) { |
|
send_sig(SIGPIPE, current, 0); |
|
goto out; |
|
} |
|
|
|
rc = -ENETUNREACH; |
|
if (!x25->neighbour) |
|
goto out; |
|
|
|
if (usx25) { |
|
rc = -EINVAL; |
|
if (msg->msg_namelen < sizeof(sx25)) |
|
goto out; |
|
memcpy(&sx25, usx25, sizeof(sx25)); |
|
rc = -EISCONN; |
|
if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr)) |
|
goto out; |
|
rc = -EINVAL; |
|
if (sx25.sx25_family != AF_X25) |
|
goto out; |
|
} else { |
|
/* |
|
* FIXME 1003.1g - if the socket is like this because |
|
* it has become closed (not started closed) we ought |
|
* to SIGPIPE, EPIPE; |
|
*/ |
|
rc = -ENOTCONN; |
|
if (sk->sk_state != TCP_ESTABLISHED) |
|
goto out; |
|
|
|
sx25.sx25_family = AF_X25; |
|
sx25.sx25_addr = x25->dest_addr; |
|
} |
|
|
|
/* Sanity check the packet size */ |
|
if (len > 65535) { |
|
rc = -EMSGSIZE; |
|
goto out; |
|
} |
|
|
|
SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n"); |
|
|
|
/* Build a packet */ |
|
SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n"); |
|
|
|
if ((msg->msg_flags & MSG_OOB) && len > 32) |
|
len = 32; |
|
|
|
size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN; |
|
|
|
release_sock(sk); |
|
skb = sock_alloc_send_skb(sk, size, noblock, &rc); |
|
lock_sock(sk); |
|
if (!skb) |
|
goto out; |
|
X25_SKB_CB(skb)->flags = msg->msg_flags; |
|
|
|
skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN); |
|
|
|
/* |
|
* Put the data on the end |
|
*/ |
|
SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n"); |
|
|
|
skb_reset_transport_header(skb); |
|
skb_put(skb, len); |
|
|
|
rc = memcpy_from_msg(skb_transport_header(skb), msg, len); |
|
if (rc) |
|
goto out_kfree_skb; |
|
|
|
/* |
|
* If the Q BIT Include socket option is in force, the first |
|
* byte of the user data is the logical value of the Q Bit. |
|
*/ |
|
if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) { |
|
if (!pskb_may_pull(skb, 1)) |
|
goto out_kfree_skb; |
|
|
|
qbit = skb->data[0]; |
|
skb_pull(skb, 1); |
|
} |
|
|
|
/* |
|
* Push down the X.25 header |
|
*/ |
|
SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n"); |
|
|
|
if (msg->msg_flags & MSG_OOB) { |
|
if (x25->neighbour->extended) { |
|
asmptr = skb_push(skb, X25_STD_MIN_LEN); |
|
*asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ; |
|
*asmptr++ = (x25->lci >> 0) & 0xFF; |
|
*asmptr++ = X25_INTERRUPT; |
|
} else { |
|
asmptr = skb_push(skb, X25_STD_MIN_LEN); |
|
*asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ; |
|
*asmptr++ = (x25->lci >> 0) & 0xFF; |
|
*asmptr++ = X25_INTERRUPT; |
|
} |
|
} else { |
|
if (x25->neighbour->extended) { |
|
/* Build an Extended X.25 header */ |
|
asmptr = skb_push(skb, X25_EXT_MIN_LEN); |
|
*asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ; |
|
*asmptr++ = (x25->lci >> 0) & 0xFF; |
|
*asmptr++ = X25_DATA; |
|
*asmptr++ = X25_DATA; |
|
} else { |
|
/* Build an Standard X.25 header */ |
|
asmptr = skb_push(skb, X25_STD_MIN_LEN); |
|
*asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ; |
|
*asmptr++ = (x25->lci >> 0) & 0xFF; |
|
*asmptr++ = X25_DATA; |
|
} |
|
|
|
if (qbit) |
|
skb->data[0] |= X25_Q_BIT; |
|
} |
|
|
|
SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n"); |
|
SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n"); |
|
|
|
rc = -ENOTCONN; |
|
if (sk->sk_state != TCP_ESTABLISHED) |
|
goto out_kfree_skb; |
|
|
|
if (msg->msg_flags & MSG_OOB) |
|
skb_queue_tail(&x25->interrupt_out_queue, skb); |
|
else { |
|
rc = x25_output(sk, skb); |
|
len = rc; |
|
if (rc < 0) |
|
kfree_skb(skb); |
|
else if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) |
|
len++; |
|
} |
|
|
|
x25_kick(sk); |
|
rc = len; |
|
out: |
|
release_sock(sk); |
|
return rc; |
|
out_kfree_skb: |
|
kfree_skb(skb); |
|
goto out; |
|
} |
|
|
|
|
|
static int x25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, |
|
int flags) |
|
{ |
|
struct sock *sk = sock->sk; |
|
struct x25_sock *x25 = x25_sk(sk); |
|
DECLARE_SOCKADDR(struct sockaddr_x25 *, sx25, msg->msg_name); |
|
size_t copied; |
|
int qbit, header_len; |
|
struct sk_buff *skb; |
|
unsigned char *asmptr; |
|
int rc = -ENOTCONN; |
|
|
|
lock_sock(sk); |
|
|
|
if (x25->neighbour == NULL) |
|
goto out; |
|
|
|
header_len = x25->neighbour->extended ? |
|
X25_EXT_MIN_LEN : X25_STD_MIN_LEN; |
|
|
|
/* |
|
* This works for seqpacket too. The receiver has ordered the queue for |
|
* us! We do one quick check first though |
|
*/ |
|
if (sk->sk_state != TCP_ESTABLISHED) |
|
goto out; |
|
|
|
if (flags & MSG_OOB) { |
|
rc = -EINVAL; |
|
if (sock_flag(sk, SOCK_URGINLINE) || |
|
!skb_peek(&x25->interrupt_in_queue)) |
|
goto out; |
|
|
|
skb = skb_dequeue(&x25->interrupt_in_queue); |
|
|
|
if (!pskb_may_pull(skb, X25_STD_MIN_LEN)) |
|
goto out_free_dgram; |
|
|
|
skb_pull(skb, X25_STD_MIN_LEN); |
|
|
|
/* |
|
* No Q bit information on Interrupt data. |
|
*/ |
|
if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) { |
|
asmptr = skb_push(skb, 1); |
|
*asmptr = 0x00; |
|
} |
|
|
|
msg->msg_flags |= MSG_OOB; |
|
} else { |
|
/* Now we can treat all alike */ |
|
release_sock(sk); |
|
skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, |
|
flags & MSG_DONTWAIT, &rc); |
|
lock_sock(sk); |
|
if (!skb) |
|
goto out; |
|
|
|
if (!pskb_may_pull(skb, header_len)) |
|
goto out_free_dgram; |
|
|
|
qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT; |
|
|
|
skb_pull(skb, header_len); |
|
|
|
if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) { |
|
asmptr = skb_push(skb, 1); |
|
*asmptr = qbit; |
|
} |
|
} |
|
|
|
skb_reset_transport_header(skb); |
|
copied = skb->len; |
|
|
|
if (copied > size) { |
|
copied = size; |
|
msg->msg_flags |= MSG_TRUNC; |
|
} |
|
|
|
/* Currently, each datagram always contains a complete record */ |
|
msg->msg_flags |= MSG_EOR; |
|
|
|
rc = skb_copy_datagram_msg(skb, 0, msg, copied); |
|
if (rc) |
|
goto out_free_dgram; |
|
|
|
if (sx25) { |
|
sx25->sx25_family = AF_X25; |
|
sx25->sx25_addr = x25->dest_addr; |
|
msg->msg_namelen = sizeof(*sx25); |
|
} |
|
|
|
x25_check_rbuf(sk); |
|
rc = copied; |
|
out_free_dgram: |
|
skb_free_datagram(sk, skb); |
|
out: |
|
release_sock(sk); |
|
return rc; |
|
} |
|
|
|
|
|
static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) |
|
{ |
|
struct sock *sk = sock->sk; |
|
struct x25_sock *x25 = x25_sk(sk); |
|
void __user *argp = (void __user *)arg; |
|
int rc; |
|
|
|
switch (cmd) { |
|
case TIOCOUTQ: { |
|
int amount; |
|
|
|
amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk); |
|
if (amount < 0) |
|
amount = 0; |
|
rc = put_user(amount, (unsigned int __user *)argp); |
|
break; |
|
} |
|
|
|
case TIOCINQ: { |
|
struct sk_buff *skb; |
|
int amount = 0; |
|
/* |
|
* These two are safe on a single CPU system as |
|
* only user tasks fiddle here |
|
*/ |
|
lock_sock(sk); |
|
if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL) |
|
amount = skb->len; |
|
release_sock(sk); |
|
rc = put_user(amount, (unsigned int __user *)argp); |
|
break; |
|
} |
|
|
|
case SIOCGIFADDR: |
|
case SIOCSIFADDR: |
|
case SIOCGIFDSTADDR: |
|
case SIOCSIFDSTADDR: |
|
case SIOCGIFBRDADDR: |
|
case SIOCSIFBRDADDR: |
|
case SIOCGIFNETMASK: |
|
case SIOCSIFNETMASK: |
|
case SIOCGIFMETRIC: |
|
case SIOCSIFMETRIC: |
|
rc = -EINVAL; |
|
break; |
|
case SIOCADDRT: |
|
case SIOCDELRT: |
|
rc = -EPERM; |
|
if (!capable(CAP_NET_ADMIN)) |
|
break; |
|
rc = x25_route_ioctl(cmd, argp); |
|
break; |
|
case SIOCX25GSUBSCRIP: |
|
rc = x25_subscr_ioctl(cmd, argp); |
|
break; |
|
case SIOCX25SSUBSCRIP: |
|
rc = -EPERM; |
|
if (!capable(CAP_NET_ADMIN)) |
|
break; |
|
rc = x25_subscr_ioctl(cmd, argp); |
|
break; |
|
case SIOCX25GFACILITIES: { |
|
lock_sock(sk); |
|
rc = copy_to_user(argp, &x25->facilities, |
|
sizeof(x25->facilities)) |
|
? -EFAULT : 0; |
|
release_sock(sk); |
|
break; |
|
} |
|
|
|
case SIOCX25SFACILITIES: { |
|
struct x25_facilities facilities; |
|
rc = -EFAULT; |
|
if (copy_from_user(&facilities, argp, sizeof(facilities))) |
|
break; |
|
rc = -EINVAL; |
|
lock_sock(sk); |
|
if (sk->sk_state != TCP_LISTEN && |
|
sk->sk_state != TCP_CLOSE) |
|
goto out_fac_release; |
|
if (facilities.pacsize_in < X25_PS16 || |
|
facilities.pacsize_in > X25_PS4096) |
|
goto out_fac_release; |
|
if (facilities.pacsize_out < X25_PS16 || |
|
facilities.pacsize_out > X25_PS4096) |
|
goto out_fac_release; |
|
if (facilities.winsize_in < 1 || |
|
facilities.winsize_in > 127) |
|
goto out_fac_release; |
|
if (facilities.throughput) { |
|
int out = facilities.throughput & 0xf0; |
|
int in = facilities.throughput & 0x0f; |
|
if (!out) |
|
facilities.throughput |= |
|
X25_DEFAULT_THROUGHPUT << 4; |
|
else if (out < 0x30 || out > 0xD0) |
|
goto out_fac_release; |
|
if (!in) |
|
facilities.throughput |= |
|
X25_DEFAULT_THROUGHPUT; |
|
else if (in < 0x03 || in > 0x0D) |
|
goto out_fac_release; |
|
} |
|
if (facilities.reverse && |
|
(facilities.reverse & 0x81) != 0x81) |
|
goto out_fac_release; |
|
x25->facilities = facilities; |
|
rc = 0; |
|
out_fac_release: |
|
release_sock(sk); |
|
break; |
|
} |
|
|
|
case SIOCX25GDTEFACILITIES: { |
|
lock_sock(sk); |
|
rc = copy_to_user(argp, &x25->dte_facilities, |
|
sizeof(x25->dte_facilities)); |
|
release_sock(sk); |
|
if (rc) |
|
rc = -EFAULT; |
|
break; |
|
} |
|
|
|
case SIOCX25SDTEFACILITIES: { |
|
struct x25_dte_facilities dtefacs; |
|
rc = -EFAULT; |
|
if (copy_from_user(&dtefacs, argp, sizeof(dtefacs))) |
|
break; |
|
rc = -EINVAL; |
|
lock_sock(sk); |
|
if (sk->sk_state != TCP_LISTEN && |
|
sk->sk_state != TCP_CLOSE) |
|
goto out_dtefac_release; |
|
if (dtefacs.calling_len > X25_MAX_AE_LEN) |
|
goto out_dtefac_release; |
|
if (dtefacs.called_len > X25_MAX_AE_LEN) |
|
goto out_dtefac_release; |
|
x25->dte_facilities = dtefacs; |
|
rc = 0; |
|
out_dtefac_release: |
|
release_sock(sk); |
|
break; |
|
} |
|
|
|
case SIOCX25GCALLUSERDATA: { |
|
lock_sock(sk); |
|
rc = copy_to_user(argp, &x25->calluserdata, |
|
sizeof(x25->calluserdata)) |
|
? -EFAULT : 0; |
|
release_sock(sk); |
|
break; |
|
} |
|
|
|
case SIOCX25SCALLUSERDATA: { |
|
struct x25_calluserdata calluserdata; |
|
|
|
rc = -EFAULT; |
|
if (copy_from_user(&calluserdata, argp, sizeof(calluserdata))) |
|
break; |
|
rc = -EINVAL; |
|
if (calluserdata.cudlength > X25_MAX_CUD_LEN) |
|
break; |
|
lock_sock(sk); |
|
x25->calluserdata = calluserdata; |
|
release_sock(sk); |
|
rc = 0; |
|
break; |
|
} |
|
|
|
case SIOCX25GCAUSEDIAG: { |
|
lock_sock(sk); |
|
rc = copy_to_user(argp, &x25->causediag, sizeof(x25->causediag)) |
|
? -EFAULT : 0; |
|
release_sock(sk); |
|
break; |
|
} |
|
|
|
case SIOCX25SCAUSEDIAG: { |
|
struct x25_causediag causediag; |
|
rc = -EFAULT; |
|
if (copy_from_user(&causediag, argp, sizeof(causediag))) |
|
break; |
|
lock_sock(sk); |
|
x25->causediag = causediag; |
|
release_sock(sk); |
|
rc = 0; |
|
break; |
|
|
|
} |
|
|
|
case SIOCX25SCUDMATCHLEN: { |
|
struct x25_subaddr sub_addr; |
|
rc = -EINVAL; |
|
lock_sock(sk); |
|
if(sk->sk_state != TCP_CLOSE) |
|
goto out_cud_release; |
|
rc = -EFAULT; |
|
if (copy_from_user(&sub_addr, argp, |
|
sizeof(sub_addr))) |
|
goto out_cud_release; |
|
rc = -EINVAL; |
|
if (sub_addr.cudmatchlength > X25_MAX_CUD_LEN) |
|
goto out_cud_release; |
|
x25->cudmatchlength = sub_addr.cudmatchlength; |
|
rc = 0; |
|
out_cud_release: |
|
release_sock(sk); |
|
break; |
|
} |
|
|
|
case SIOCX25CALLACCPTAPPRV: { |
|
rc = -EINVAL; |
|
lock_sock(sk); |
|
if (sk->sk_state == TCP_CLOSE) { |
|
clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags); |
|
rc = 0; |
|
} |
|
release_sock(sk); |
|
break; |
|
} |
|
|
|
case SIOCX25SENDCALLACCPT: { |
|
rc = -EINVAL; |
|
lock_sock(sk); |
|
if (sk->sk_state != TCP_ESTABLISHED) |
|
goto out_sendcallaccpt_release; |
|
/* must call accptapprv above */ |
|
if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags)) |
|
goto out_sendcallaccpt_release; |
|
x25_write_internal(sk, X25_CALL_ACCEPTED); |
|
x25->state = X25_STATE_3; |
|
rc = 0; |
|
out_sendcallaccpt_release: |
|
release_sock(sk); |
|
break; |
|
} |
|
|
|
default: |
|
rc = -ENOIOCTLCMD; |
|
break; |
|
} |
|
|
|
return rc; |
|
} |
|
|
|
static const struct net_proto_family x25_family_ops = { |
|
.family = AF_X25, |
|
.create = x25_create, |
|
.owner = THIS_MODULE, |
|
}; |
|
|
|
#ifdef CONFIG_COMPAT |
|
static int compat_x25_subscr_ioctl(unsigned int cmd, |
|
struct compat_x25_subscrip_struct __user *x25_subscr32) |
|
{ |
|
struct compat_x25_subscrip_struct x25_subscr; |
|
struct x25_neigh *nb; |
|
struct net_device *dev; |
|
int rc = -EINVAL; |
|
|
|
rc = -EFAULT; |
|
if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32))) |
|
goto out; |
|
|
|
rc = -EINVAL; |
|
dev = x25_dev_get(x25_subscr.device); |
|
if (dev == NULL) |
|
goto out; |
|
|
|
nb = x25_get_neigh(dev); |
|
if (nb == NULL) |
|
goto out_dev_put; |
|
|
|
dev_put(dev); |
|
|
|
if (cmd == SIOCX25GSUBSCRIP) { |
|
read_lock_bh(&x25_neigh_list_lock); |
|
x25_subscr.extended = nb->extended; |
|
x25_subscr.global_facil_mask = nb->global_facil_mask; |
|
read_unlock_bh(&x25_neigh_list_lock); |
|
rc = copy_to_user(x25_subscr32, &x25_subscr, |
|
sizeof(*x25_subscr32)) ? -EFAULT : 0; |
|
} else { |
|
rc = -EINVAL; |
|
if (x25_subscr.extended == 0 || x25_subscr.extended == 1) { |
|
rc = 0; |
|
write_lock_bh(&x25_neigh_list_lock); |
|
nb->extended = x25_subscr.extended; |
|
nb->global_facil_mask = x25_subscr.global_facil_mask; |
|
write_unlock_bh(&x25_neigh_list_lock); |
|
} |
|
} |
|
x25_neigh_put(nb); |
|
out: |
|
return rc; |
|
out_dev_put: |
|
dev_put(dev); |
|
goto out; |
|
} |
|
|
|
static int compat_x25_ioctl(struct socket *sock, unsigned int cmd, |
|
unsigned long arg) |
|
{ |
|
void __user *argp = compat_ptr(arg); |
|
int rc = -ENOIOCTLCMD; |
|
|
|
switch(cmd) { |
|
case TIOCOUTQ: |
|
case TIOCINQ: |
|
rc = x25_ioctl(sock, cmd, (unsigned long)argp); |
|
break; |
|
case SIOCGIFADDR: |
|
case SIOCSIFADDR: |
|
case SIOCGIFDSTADDR: |
|
case SIOCSIFDSTADDR: |
|
case SIOCGIFBRDADDR: |
|
case SIOCSIFBRDADDR: |
|
case SIOCGIFNETMASK: |
|
case SIOCSIFNETMASK: |
|
case SIOCGIFMETRIC: |
|
case SIOCSIFMETRIC: |
|
rc = -EINVAL; |
|
break; |
|
case SIOCADDRT: |
|
case SIOCDELRT: |
|
rc = -EPERM; |
|
if (!capable(CAP_NET_ADMIN)) |
|
break; |
|
rc = x25_route_ioctl(cmd, argp); |
|
break; |
|
case SIOCX25GSUBSCRIP: |
|
rc = compat_x25_subscr_ioctl(cmd, argp); |
|
break; |
|
case SIOCX25SSUBSCRIP: |
|
rc = -EPERM; |
|
if (!capable(CAP_NET_ADMIN)) |
|
break; |
|
rc = compat_x25_subscr_ioctl(cmd, argp); |
|
break; |
|
case SIOCX25GFACILITIES: |
|
case SIOCX25SFACILITIES: |
|
case SIOCX25GDTEFACILITIES: |
|
case SIOCX25SDTEFACILITIES: |
|
case SIOCX25GCALLUSERDATA: |
|
case SIOCX25SCALLUSERDATA: |
|
case SIOCX25GCAUSEDIAG: |
|
case SIOCX25SCAUSEDIAG: |
|
case SIOCX25SCUDMATCHLEN: |
|
case SIOCX25CALLACCPTAPPRV: |
|
case SIOCX25SENDCALLACCPT: |
|
rc = x25_ioctl(sock, cmd, (unsigned long)argp); |
|
break; |
|
default: |
|
rc = -ENOIOCTLCMD; |
|
break; |
|
} |
|
return rc; |
|
} |
|
#endif |
|
|
|
static const struct proto_ops x25_proto_ops = { |
|
.family = AF_X25, |
|
.owner = THIS_MODULE, |
|
.release = x25_release, |
|
.bind = x25_bind, |
|
.connect = x25_connect, |
|
.socketpair = sock_no_socketpair, |
|
.accept = x25_accept, |
|
.getname = x25_getname, |
|
.poll = datagram_poll, |
|
.ioctl = x25_ioctl, |
|
#ifdef CONFIG_COMPAT |
|
.compat_ioctl = compat_x25_ioctl, |
|
#endif |
|
.gettstamp = sock_gettstamp, |
|
.listen = x25_listen, |
|
.shutdown = sock_no_shutdown, |
|
.setsockopt = x25_setsockopt, |
|
.getsockopt = x25_getsockopt, |
|
.sendmsg = x25_sendmsg, |
|
.recvmsg = x25_recvmsg, |
|
.mmap = sock_no_mmap, |
|
.sendpage = sock_no_sendpage, |
|
}; |
|
|
|
static struct packet_type x25_packet_type __read_mostly = { |
|
.type = cpu_to_be16(ETH_P_X25), |
|
.func = x25_lapb_receive_frame, |
|
}; |
|
|
|
static struct notifier_block x25_dev_notifier = { |
|
.notifier_call = x25_device_event, |
|
}; |
|
|
|
void x25_kill_by_neigh(struct x25_neigh *nb) |
|
{ |
|
struct sock *s; |
|
|
|
write_lock_bh(&x25_list_lock); |
|
|
|
sk_for_each(s, &x25_list) |
|
if (x25_sk(s)->neighbour == nb) |
|
x25_disconnect(s, ENETUNREACH, 0, 0); |
|
|
|
write_unlock_bh(&x25_list_lock); |
|
|
|
/* Remove any related forwards */ |
|
x25_clear_forward_by_dev(nb->dev); |
|
} |
|
|
|
static int __init x25_init(void) |
|
{ |
|
int rc; |
|
|
|
rc = proto_register(&x25_proto, 0); |
|
if (rc) |
|
goto out; |
|
|
|
rc = sock_register(&x25_family_ops); |
|
if (rc) |
|
goto out_proto; |
|
|
|
dev_add_pack(&x25_packet_type); |
|
|
|
rc = register_netdevice_notifier(&x25_dev_notifier); |
|
if (rc) |
|
goto out_sock; |
|
|
|
rc = x25_register_sysctl(); |
|
if (rc) |
|
goto out_dev; |
|
|
|
rc = x25_proc_init(); |
|
if (rc) |
|
goto out_sysctl; |
|
|
|
pr_info("Linux Version 0.2\n"); |
|
|
|
out: |
|
return rc; |
|
out_sysctl: |
|
x25_unregister_sysctl(); |
|
out_dev: |
|
unregister_netdevice_notifier(&x25_dev_notifier); |
|
out_sock: |
|
dev_remove_pack(&x25_packet_type); |
|
sock_unregister(AF_X25); |
|
out_proto: |
|
proto_unregister(&x25_proto); |
|
goto out; |
|
} |
|
module_init(x25_init); |
|
|
|
static void __exit x25_exit(void) |
|
{ |
|
x25_proc_exit(); |
|
x25_link_free(); |
|
x25_route_free(); |
|
|
|
x25_unregister_sysctl(); |
|
|
|
unregister_netdevice_notifier(&x25_dev_notifier); |
|
|
|
dev_remove_pack(&x25_packet_type); |
|
|
|
sock_unregister(AF_X25); |
|
proto_unregister(&x25_proto); |
|
} |
|
module_exit(x25_exit); |
|
|
|
MODULE_AUTHOR("Jonathan Naylor <[email protected]>"); |
|
MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol"); |
|
MODULE_LICENSE("GPL"); |
|
MODULE_ALIAS_NETPROTO(PF_X25);
|
|
|