af_x25.c
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:32k
- /*
- * X.25 Packet Layer release 002
- *
- * This is ALPHA test software. This code may break your machine, randomly fail to work with new
- * releases, misbehave and/or generally screw up. It might even work.
- *
- * This code REQUIRES 2.1.15 or higher
- *
- * This module:
- * This module is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- *
- * History
- * X.25 001 Jonathan Naylor Started coding.
- * X.25 002 Jonathan Naylor Centralised disconnect handling.
- * New timer architecture.
- * 2000-03-11 Henner Eisen MSG_EOR handling more POSIX compliant.
- * 2000-03-22 Daniela Squassoni Allowed disabling/enabling of
- * facilities negotiation and increased
- * the throughput upper limit.
- * 2000-08-27 Arnaldo C. Melo s/suser/capable/ + micro cleanups
- * 2000-09-04 Henner Eisen Set sock->state in x25_accept().
- * Fixed x25_output() related skb leakage.
- * 2000-10-02 Henner Eisen Made x25_kick() single threaded per socket.
- * 2000-10-27 Henner Eisen MSG_DONTWAIT for fragment allocation.
- * 2000-11-14 Henner Eisen Closing datalink from NETDEV_GOING_DOWN
- */
- #include <linux/config.h>
- #include <linux/module.h>
- #include <linux/errno.h>
- #include <linux/types.h>
- #include <linux/socket.h>
- #include <linux/in.h>
- #include <linux/kernel.h>
- #include <linux/sched.h>
- #include <linux/timer.h>
- #include <linux/string.h>
- #include <linux/sockios.h>
- #include <linux/net.h>
- #include <linux/stat.h>
- #include <linux/inet.h>
- #include <linux/netdevice.h>
- #include <linux/if_arp.h>
- #include <linux/skbuff.h>
- #include <net/sock.h>
- #include <asm/segment.h>
- #include <asm/system.h>
- #include <asm/uaccess.h>
- #include <linux/fcntl.h>
- #include <linux/termios.h> /* For TIOCINQ/OUTQ */
- #include <linux/mm.h>
- #include <linux/interrupt.h>
- #include <linux/notifier.h>
- #include <linux/proc_fs.h>
- #include <linux/init.h>
- #include <net/x25.h>
- int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
- int sysctl_x25_call_request_timeout = X25_DEFAULT_T21;
- int sysctl_x25_reset_request_timeout = X25_DEFAULT_T22;
- int sysctl_x25_clear_request_timeout = X25_DEFAULT_T23;
- int sysctl_x25_ack_holdback_timeout = X25_DEFAULT_T2;
- static struct sock *volatile x25_list /* = NULL initially */;
- static struct proto_ops x25_proto_ops;
- static x25_address null_x25_address = {" "};
- int x25_addr_ntoa(unsigned char *p, x25_address *called_addr, x25_address *calling_addr)
- {
- int called_len, calling_len;
- char *called, *calling;
- int i;
- called_len = (*p >> 0) & 0x0F;
- calling_len = (*p >> 4) & 0x0F;
- called = called_addr->x25_addr;
- calling = calling_addr->x25_addr;
- p++;
- for (i = 0; i < (called_len + calling_len); i++) {
- if (i < called_len) {
- if (i % 2 != 0) {
- *called++ = ((*p >> 0) & 0x0F) + '0';
- p++;
- } else {
- *called++ = ((*p >> 4) & 0x0F) + '0';
- }
- } else {
- if (i % 2 != 0) {
- *calling++ = ((*p >> 0) & 0x0F) + '0';
- p++;
- } else {
- *calling++ = ((*p >> 4) & 0x0F) + '0';
- }
- }
- }
- *called = '';
- *calling = '';
- return 1 + (called_len + calling_len + 1) / 2;
- }
- int x25_addr_aton(unsigned char *p, x25_address *called_addr, x25_address *calling_addr)
- {
- unsigned int called_len, calling_len;
- char *called, *calling;
- int i;
- called = called_addr->x25_addr;
- calling = calling_addr->x25_addr;
- called_len = strlen(called);
- calling_len = strlen(calling);
- *p++ = (calling_len << 4) | (called_len << 0);
- for (i = 0; i < (called_len + calling_len); i++) {
- if (i < called_len) {
- if (i % 2 != 0) {
- *p |= (*called++ - '0') << 0;
- p++;
- } else {
- *p = 0x00;
- *p |= (*called++ - '0') << 4;
- }
- } else {
- if (i % 2 != 0) {
- *p |= (*calling++ - '0') << 0;
- p++;
- } else {
- *p = 0x00;
- *p |= (*calling++ - '0') << 4;
- }
- }
- }
- return 1 + (called_len + calling_len + 1) / 2;
- }
- /*
- * Socket removal during an interrupt is now safe.
- */
- static void x25_remove_socket(struct sock *sk)
- {
- struct sock *s;
- unsigned long flags;
- save_flags(flags);
- cli();
- if ((s = x25_list) == sk) {
- x25_list = s->next;
- restore_flags(flags);
- return;
- }
- while (s != NULL && s->next != NULL) {
- if (s->next == sk) {
- s->next = sk->next;
- restore_flags(flags);
- return;
- }
- s = s->next;
- }
- restore_flags(flags);
- }
- /*
- * Kill all bound sockets on a dropped device.
- */
- static void x25_kill_by_device(struct net_device *dev)
- {
- struct sock *s;
- for (s = x25_list; s != NULL; s = s->next)
- if (s->protinfo.x25->neighbour &&
- s->protinfo.x25->neighbour->dev == dev)
- x25_disconnect(s, ENETUNREACH, 0, 0);
- }
- /*
- * Handle device status changes.
- */
- static int x25_device_event(struct notifier_block *this, unsigned long event, void *ptr)
- {
- struct net_device *dev = (struct net_device *)ptr;
- struct x25_neigh *neigh;
- if (dev->type == ARPHRD_X25
- #if defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE)
- || dev->type == ARPHRD_ETHER
- #endif
- ) {
- switch (event) {
- case NETDEV_UP:
- x25_link_device_up(dev);
- break;
- case NETDEV_GOING_DOWN:
- if ((neigh = x25_get_neigh(dev)))
- x25_terminate_link(neigh);
- break;
- case NETDEV_DOWN:
- x25_kill_by_device(dev);
- x25_route_device_down(dev);
- x25_link_device_down(dev);
- break;
- }
- }
- return NOTIFY_DONE;
- }
- /*
- * Add a socket to the bound sockets list.
- */
- static void x25_insert_socket(struct sock *sk)
- {
- unsigned long flags;
- save_flags(flags);
- cli();
- sk->next = x25_list;
- x25_list = sk;
- restore_flags(flags);
- }
- /*
- * Find a socket that wants to accept the Call Request we just
- * received.
- */
- static struct sock *x25_find_listener(x25_address *addr)
- {
- unsigned long flags;
- struct sock *s;
- save_flags(flags);
- cli();
- for (s = x25_list; s != NULL; s = s->next) {
- if ((strcmp(addr->x25_addr, s->protinfo.x25->source_addr.x25_addr) == 0 ||
- strcmp(addr->x25_addr, null_x25_address.x25_addr) == 0) &&
- s->state == TCP_LISTEN) {
- restore_flags(flags);
- return s;
- }
- }
- restore_flags(flags);
- return NULL;
- }
- /*
- * Find a connected X.25 socket given my LCI and neighbour.
- */
- struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *neigh)
- {
- struct sock *s;
- unsigned long flags;
- save_flags(flags);
- cli();
- for (s = x25_list; s != NULL; s = s->next) {
- if (s->protinfo.x25->lci == lci && s->protinfo.x25->neighbour == neigh) {
- restore_flags(flags);
- return s;
- }
- }
- restore_flags(flags);
- return NULL;
- }
- /*
- * Find a unique LCI for a given device.
- */
- unsigned int x25_new_lci(struct x25_neigh *neigh)
- {
- unsigned int lci = 1;
- while (x25_find_socket(lci, neigh) != NULL) {
- lci++;
- if (lci == 4096) return 0;
- }
- return lci;
- }
- /*
- * Deferred destroy.
- */
- void x25_destroy_socket(struct sock *);
- /*
- * handler for deferred kills.
- */
- static void x25_destroy_timer(unsigned long data)
- {
- x25_destroy_socket((struct sock *)data);
- }
- /*
- * 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 will
- * touch it and we are (fairly 8-) ) safe.
- */
- void x25_destroy_socket(struct sock *sk) /* Not static as it's used by the timer */
- {
- struct sk_buff *skb;
- unsigned long flags;
- save_flags(flags);
- cli();
- x25_stop_heartbeat(sk);
- x25_stop_timer(sk);
- x25_remove_socket(sk);
- x25_clear_queues(sk); /* Flush the queues */
- while ((skb = skb_dequeue(&sk->receive_queue)) != NULL) {
- if (skb->sk != sk) { /* A pending connection */
- skb->sk->dead = 1; /* Queue the unaccepted socket for death */
- x25_start_heartbeat(skb->sk);
- skb->sk->protinfo.x25->state = X25_STATE_0;
- }
- kfree_skb(skb);
- }
- if (atomic_read(&sk->wmem_alloc) != 0 || atomic_read(&sk->rmem_alloc) != 0) {
- /* Defer: outstanding buffers */
- init_timer(&sk->timer);
- sk->timer.expires = jiffies + 10 * HZ;
- sk->timer.function = x25_destroy_timer;
- sk->timer.data = (unsigned long)sk;
- add_timer(&sk->timer);
- } else {
- sk_free(sk);
- MOD_DEC_USE_COUNT;
- }
- restore_flags(flags);
- }
- /*
- * 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,
- char *optval, int optlen)
- {
- struct sock *sk = sock->sk;
- int opt;
- if (level != SOL_X25)
- return -ENOPROTOOPT;
- if (optlen < sizeof(int))
- return-EINVAL;
- if (get_user(opt, (int *)optval))
- return -EFAULT;
- switch (optname) {
- case X25_QBITINCL:
- sk->protinfo.x25->qbitincl = opt ? 1 : 0;
- return 0;
- default:
- return -ENOPROTOOPT;
- }
- }
- static int x25_getsockopt(struct socket *sock, int level, int optname,
- char *optval, int *optlen)
- {
- struct sock *sk = sock->sk;
- int val = 0;
- int len;
-
- if (level != SOL_X25)
- return -ENOPROTOOPT;
- if (get_user(len, optlen))
- return -EFAULT;
- switch (optname) {
- case X25_QBITINCL:
- val = sk->protinfo.x25->qbitincl;
- break;
- default:
- return -ENOPROTOOPT;
- }
- len = min_t(unsigned int, len, sizeof(int));
- if (len < 0)
- return -EINVAL;
-
- if (put_user(len, optlen))
- return -EFAULT;
- return copy_to_user(optval, &val, len) ? -EFAULT : 0;
- }
- static int x25_listen(struct socket *sock, int backlog)
- {
- struct sock *sk = sock->sk;
- if (sk->state != TCP_LISTEN) {
- memset(&sk->protinfo.x25->dest_addr, '', X25_ADDR_LEN);
- sk->max_ack_backlog = backlog;
- sk->state = TCP_LISTEN;
- return 0;
- }
- return -EOPNOTSUPP;
- }
- static struct sock *x25_alloc_socket(void)
- {
- struct sock *sk;
- x25_cb *x25;
- if ((sk = sk_alloc(AF_X25, GFP_ATOMIC, 1)) == NULL)
- return NULL;
- if ((x25 = kmalloc(sizeof(*x25), GFP_ATOMIC)) == NULL) {
- sk_free(sk);
- return NULL;
- }
- memset(x25, 0x00, sizeof(*x25));
- x25->sk = sk;
- sk->protinfo.x25 = x25;
- MOD_INC_USE_COUNT;
- sock_init_data(NULL, 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);
- return sk;
- }
- static int x25_create(struct socket *sock, int protocol)
- {
- struct sock *sk;
- x25_cb *x25;
- if (sock->type != SOCK_SEQPACKET || protocol != 0)
- return -ESOCKTNOSUPPORT;
- if ((sk = x25_alloc_socket()) == NULL)
- return -ENOMEM;
- x25 = sk->protinfo.x25;
- sock_init_data(sock, sk);
- init_timer(&x25->timer);
- sock->ops = &x25_proto_ops;
- sk->protocol = protocol;
- 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->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 = X25_DEFAULT_THROUGHPUT;
- x25->facilities.reverse = X25_DEFAULT_REVERSE;
- return 0;
- }
- static struct sock *x25_make_new(struct sock *osk)
- {
- struct sock *sk;
- x25_cb *x25;
- if (osk->type != SOCK_SEQPACKET)
- return NULL;
- if ((sk = x25_alloc_socket()) == NULL)
- return NULL;
- x25 = sk->protinfo.x25;
- sk->type = osk->type;
- sk->socket = osk->socket;
- sk->priority = osk->priority;
- sk->protocol = osk->protocol;
- sk->rcvbuf = osk->rcvbuf;
- sk->sndbuf = osk->sndbuf;
- sk->debug = osk->debug;
- sk->state = TCP_ESTABLISHED;
- sk->sleep = osk->sleep;
- sk->zapped = osk->zapped;
- sk->backlog_rcv = osk->backlog_rcv;
- x25->t21 = osk->protinfo.x25->t21;
- x25->t22 = osk->protinfo.x25->t22;
- x25->t23 = osk->protinfo.x25->t23;
- x25->t2 = osk->protinfo.x25->t2;
- x25->facilities = osk->protinfo.x25->facilities;
- x25->qbitincl = osk->protinfo.x25->qbitincl;
- init_timer(&x25->timer);
- return sk;
- }
- static int x25_release(struct socket *sock)
- {
- struct sock *sk = sock->sk;
- if (sk == NULL) return 0;
- switch (sk->protinfo.x25->state) {
- case X25_STATE_0:
- case X25_STATE_2:
- x25_disconnect(sk, 0, 0, 0);
- x25_destroy_socket(sk);
- break;
- 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);
- sk->protinfo.x25->state = X25_STATE_2;
- sk->state = TCP_CLOSE;
- sk->shutdown |= SEND_SHUTDOWN;
- sk->state_change(sk);
- sk->dead = 1;
- sk->destroy = 1;
- break;
- default:
- break;
- }
- sock->sk = NULL;
- sk->socket = NULL; /* Not used, but we should do this */
- 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;
- if (sk->zapped == 0)
- return -EINVAL;
- if (addr_len != sizeof(struct sockaddr_x25))
- return -EINVAL;
- if (addr->sx25_family != AF_X25)
- return -EINVAL;
- sk->protinfo.x25->source_addr = addr->sx25_addr;
- x25_insert_socket(sk);
- sk->zapped = 0;
- SOCK_DEBUG(sk, "x25_bind: socket is boundn");
- return 0;
- }
- static int x25_connect(struct socket *sock, struct sockaddr *uaddr, int addr_len, int flags)
- {
- struct sock *sk = sock->sk;
- struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
- struct net_device *dev;
- if (sk->state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
- sock->state = SS_CONNECTED;
- return 0; /* Connect completed during a ERESTARTSYS event */
- }
- if (sk->state == TCP_CLOSE && sock->state == SS_CONNECTING) {
- sock->state = SS_UNCONNECTED;
- return -ECONNREFUSED;
- }
- if (sk->state == TCP_ESTABLISHED)
- return -EISCONN; /* No reconnect on a seqpacket socket */
- sk->state = TCP_CLOSE;
- sock->state = SS_UNCONNECTED;
- if (addr_len != sizeof(struct sockaddr_x25))
- return -EINVAL;
- if (addr->sx25_family != AF_X25)
- return -EINVAL;
- if ((dev = x25_get_route(&addr->sx25_addr)) == NULL)
- return -ENETUNREACH;
- if ((sk->protinfo.x25->neighbour = x25_get_neigh(dev)) == NULL)
- return -ENETUNREACH;
- x25_limit_facilities(&sk->protinfo.x25->facilities,
- sk->protinfo.x25->neighbour);
- if ((sk->protinfo.x25->lci = x25_new_lci(sk->protinfo.x25->neighbour)) == 0)
- return -ENETUNREACH;
- if (sk->zapped) /* Must bind first - autobinding does not work */
- return -EINVAL;
- if (strcmp(sk->protinfo.x25->source_addr.x25_addr, null_x25_address.x25_addr) == 0)
- memset(&sk->protinfo.x25->source_addr, '', X25_ADDR_LEN);
- sk->protinfo.x25->dest_addr = addr->sx25_addr;
- /* Move to connecting socket, start sending Connect Requests */
- sock->state = SS_CONNECTING;
- sk->state = TCP_SYN_SENT;
- sk->protinfo.x25->state = X25_STATE_1;
- x25_write_internal(sk, X25_CALL_REQUEST);
- x25_start_heartbeat(sk);
- x25_start_t21timer(sk);
- /* Now the loop */
- if (sk->state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
- return -EINPROGRESS;
- cli(); /* To avoid races on the sleep */
- /*
- * A Clear Request or timeout or failed routing will go to closed.
- */
- while (sk->state == TCP_SYN_SENT) {
- interruptible_sleep_on(sk->sleep);
- if (signal_pending(current)) {
- sti();
- return -ERESTARTSYS;
- }
- }
- if (sk->state != TCP_ESTABLISHED) {
- sti();
- sock->state = SS_UNCONNECTED;
- return sock_error(sk); /* Always set at this point */
- }
- sock->state = SS_CONNECTED;
- sti();
- return 0;
- }
-
- static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
- {
- struct sock *sk;
- struct sock *newsk;
- struct sk_buff *skb;
- if ((sk = sock->sk) == NULL)
- return -EINVAL;
- if (sk->type != SOCK_SEQPACKET)
- return -EOPNOTSUPP;
- if (sk->state != TCP_LISTEN)
- return -EINVAL;
- /*
- * The write queue this time is holding sockets ready to use
- * hooked into the CALL INDICATION we saved
- */
- do {
- cli();
- if ((skb = skb_dequeue(&sk->receive_queue)) == NULL) {
- if (flags & O_NONBLOCK) {
- sti();
- return -EWOULDBLOCK;
- }
- interruptible_sleep_on(sk->sleep);
- if (signal_pending(current)) {
- sti();
- return -ERESTARTSYS;
- }
- }
- } while (skb == NULL);
- newsk = skb->sk;
- newsk->pair = NULL;
- newsk->socket = newsock;
- newsk->sleep = &newsock->wait;
- sti();
- /* Now attach up the new socket */
- skb->sk = NULL;
- kfree_skb(skb);
- sk->ack_backlog--;
- newsock->sk = newsk;
- newsock->state = SS_CONNECTED;
- return 0;
- }
- static int x25_getname(struct socket *sock, struct sockaddr *uaddr, int *uaddr_len, int peer)
- {
- struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
- struct sock *sk = sock->sk;
- if (peer != 0) {
- if (sk->state != TCP_ESTABLISHED)
- return -ENOTCONN;
- sx25->sx25_addr = sk->protinfo.x25->dest_addr;
- } else {
- sx25->sx25_addr = sk->protinfo.x25->source_addr;
- }
- sx25->sx25_family = AF_X25;
- *uaddr_len = sizeof(struct sockaddr_x25);
- return 0;
- }
-
- int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *neigh, unsigned int lci)
- {
- struct sock *sk;
- struct sock *make;
- x25_address source_addr, dest_addr;
- struct x25_facilities facilities;
- int len;
- /*
- * 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.
- */
- skb_pull(skb, x25_addr_ntoa(skb->data, &source_addr, &dest_addr));
- /*
- * Find a listener for the particular address.
- */
- sk = x25_find_listener(&source_addr);
- /*
- * We can't accept the Call Request.
- */
- if (sk == NULL || sk->ack_backlog == sk->max_ack_backlog) {
- x25_transmit_clear_request(neigh, lci, 0x01);
- return 0;
- }
- /*
- * Try to reach a compromise on the requested facilities.
- */
- if ((len = x25_negotiate_facilities(skb, sk, &facilities)) == -1) {
- x25_transmit_clear_request(neigh, lci, 0x01);
- return 0;
- }
- /*
- * current neighbour/link might impose additional limits
- * on certain facilties
- */
- x25_limit_facilities(&facilities,neigh);
- /*
- * Try to create a new socket.
- */
- if ((make = x25_make_new(sk)) == NULL) {
- x25_transmit_clear_request(neigh, lci, 0x01);
- return 0;
- }
- /*
- * Remove the facilities, leaving any Call User Data.
- */
- skb_pull(skb, len);
- skb->sk = make;
- make->state = TCP_ESTABLISHED;
- make->protinfo.x25->lci = lci;
- make->protinfo.x25->dest_addr = dest_addr;
- make->protinfo.x25->source_addr = source_addr;
- make->protinfo.x25->neighbour = neigh;
- make->protinfo.x25->facilities = facilities;
- make->protinfo.x25->vc_facil_mask = sk->protinfo.x25->vc_facil_mask;
- x25_write_internal(make, X25_CALL_ACCEPTED);
- /*
- * Incoming Call User Data.
- */
- if (skb->len >= 0) {
- memcpy(make->protinfo.x25->calluserdata.cuddata, skb->data, skb->len);
- make->protinfo.x25->calluserdata.cudlength = skb->len;
- }
- make->protinfo.x25->state = X25_STATE_3;
- sk->ack_backlog++;
- make->pair = sk;
- x25_insert_socket(make);
- skb_queue_head(&sk->receive_queue, skb);
- x25_start_heartbeat(make);
- if (!sk->dead)
- sk->data_ready(sk, skb->len);
- return 1;
- }
- static int x25_sendmsg(struct socket *sock, struct msghdr *msg, int len, struct scm_cookie *scm)
- {
- struct sock *sk = sock->sk;
- struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name;
- int err;
- struct sockaddr_x25 sx25;
- struct sk_buff *skb;
- unsigned char *asmptr;
- int size, qbit = 0;
- if (msg->msg_flags & ~(MSG_DONTWAIT | MSG_OOB | MSG_EOR))
- return -EINVAL;
- /* we currently don't support segmented records at the user interface */
- if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
- return -EINVAL;
- if (sk->zapped)
- return -EADDRNOTAVAIL;
- if (sk->shutdown & SEND_SHUTDOWN) {
- send_sig(SIGPIPE, current, 0);
- return -EPIPE;
- }
- if (sk->protinfo.x25->neighbour == NULL)
- return -ENETUNREACH;
- if (usx25 != NULL) {
- if (msg->msg_namelen < sizeof(sx25))
- return -EINVAL;
- sx25 = *usx25;
- if (strcmp(sk->protinfo.x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr) != 0)
- return -EISCONN;
- if (sx25.sx25_family != AF_X25)
- return -EINVAL;
- } else {
- /*
- * FIXME 1003.1g - if the socket is like this because
- * it has become closed (not started closed) we ought
- * to SIGPIPE, EPIPE;
- */
- if (sk->state != TCP_ESTABLISHED)
- return -ENOTCONN;
- sx25.sx25_family = AF_X25;
- sx25.sx25_addr = sk->protinfo.x25->dest_addr;
- }
- 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;
- if ((skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT, &err)) == NULL)
- return err;
- 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 datan");
- asmptr = skb->h.raw = skb_put(skb, len);
- memcpy_fromiovec(asmptr, msg->msg_iov, len);
- /*
- * 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 (sk->protinfo.x25->qbitincl) {
- 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 (sk->protinfo.x25->neighbour->extended) {
- asmptr = skb_push(skb, X25_STD_MIN_LEN);
- *asmptr++ = ((sk->protinfo.x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
- *asmptr++ = (sk->protinfo.x25->lci >> 0) & 0xFF;
- *asmptr++ = X25_INTERRUPT;
- } else {
- asmptr = skb_push(skb, X25_STD_MIN_LEN);
- *asmptr++ = ((sk->protinfo.x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
- *asmptr++ = (sk->protinfo.x25->lci >> 0) & 0xFF;
- *asmptr++ = X25_INTERRUPT;
- }
- } else {
- if (sk->protinfo.x25->neighbour->extended) {
- /* Build an Extended X.25 header */
- asmptr = skb_push(skb, X25_EXT_MIN_LEN);
- *asmptr++ = ((sk->protinfo.x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
- *asmptr++ = (sk->protinfo.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++ = ((sk->protinfo.x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
- *asmptr++ = (sk->protinfo.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 buffern");
- if (sk->state != TCP_ESTABLISHED) {
- kfree_skb(skb);
- return -ENOTCONN;
- }
- if (msg->msg_flags & MSG_OOB) {
- skb_queue_tail(&sk->protinfo.x25->interrupt_out_queue, skb);
- } else {
- len = x25_output(sk, skb);
- if(len<0){
- kfree_skb(skb);
- } else {
- if(sk->protinfo.x25->qbitincl) len++;
- }
- }
- /*
- * lock_sock() is currently only used to serialize this x25_kick()
- * against input-driven x25_kick() calls. It currently only blocks
- * incoming packets for this socket and does not protect against
- * any other socket state changes and is not called from anywhere
- * else. As x25_kick() cannot block and as long as all socket
- * operations are BKL-wrapped, we don't need take to care about
- * purging the backlog queue in x25_release().
- *
- * Using lock_sock() to protect all socket operations entirely
- * (and making the whole x25 stack SMP aware) unfortunately would
- * require major changes to {send,recv}msg and skb allocation methods.
- * -> 2.5 ;)
- */
- lock_sock(sk);
- x25_kick(sk);
- release_sock(sk);
- return len;
- }
- static int x25_recvmsg(struct socket *sock, struct msghdr *msg, int size, int flags, struct scm_cookie *scm)
- {
- struct sock *sk = sock->sk;
- struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name;
- int copied, qbit;
- struct sk_buff *skb;
- unsigned char *asmptr;
- int er;
- /*
- * This works for seqpacket too. The receiver has ordered the queue for
- * us! We do one quick check first though
- */
- if (sk->state != TCP_ESTABLISHED)
- return -ENOTCONN;
- if (flags & MSG_OOB) {
- if (sk->urginline || skb_peek(&sk->protinfo.x25->interrupt_in_queue) == NULL)
- return -EINVAL;
- skb = skb_dequeue(&sk->protinfo.x25->interrupt_in_queue);
- skb_pull(skb, X25_STD_MIN_LEN);
- /*
- * No Q bit information on Interrupt data.
- */
- if (sk->protinfo.x25->qbitincl) {
- asmptr = skb_push(skb, 1);
- *asmptr = 0x00;
- }
- msg->msg_flags |= MSG_OOB;
- } else {
- /* Now we can treat all alike */
- if ((skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, flags & MSG_DONTWAIT, &er)) == NULL)
- return er;
- qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
- skb_pull(skb, (sk->protinfo.x25->neighbour->extended) ? X25_EXT_MIN_LEN : X25_STD_MIN_LEN);
- if (sk->protinfo.x25->qbitincl) {
- asmptr = skb_push(skb, 1);
- *asmptr = qbit;
- }
- }
- skb->h.raw = skb->data;
- 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;
- skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
- if (sx25 != NULL) {
- sx25->sx25_family = AF_X25;
- sx25->sx25_addr = sk->protinfo.x25->dest_addr;
- }
- msg->msg_namelen = sizeof(struct sockaddr_x25);
- skb_free_datagram(sk, skb);
- lock_sock(sk);
- x25_check_rbuf(sk);
- release_sock(sk);
- return copied;
- }
- static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
- {
- struct sock *sk = sock->sk;
- switch (cmd) {
- case TIOCOUTQ: {
- int amount;
- amount = sk->sndbuf - atomic_read(&sk->wmem_alloc);
- if (amount < 0)
- amount = 0;
- return put_user(amount, (unsigned int *)arg);
- }
- case TIOCINQ: {
- struct sk_buff *skb;
- int amount = 0;
- /* These two are safe on a single CPU system as only user tasks fiddle here */
- if ((skb = skb_peek(&sk->receive_queue)) != NULL)
- amount = skb->len;
- return put_user(amount, (unsigned int *)arg);
- }
- case SIOCGSTAMP:
- if (sk != NULL) {
- if (sk->stamp.tv_sec == 0)
- return -ENOENT;
- return copy_to_user((void *)arg, &sk->stamp, sizeof(struct timeval)) ? -EFAULT : 0;
- }
- return -EINVAL;
- case SIOCGIFADDR:
- case SIOCSIFADDR:
- case SIOCGIFDSTADDR:
- case SIOCSIFDSTADDR:
- case SIOCGIFBRDADDR:
- case SIOCSIFBRDADDR:
- case SIOCGIFNETMASK:
- case SIOCSIFNETMASK:
- case SIOCGIFMETRIC:
- case SIOCSIFMETRIC:
- return -EINVAL;
- case SIOCADDRT:
- case SIOCDELRT:
- if (!capable(CAP_NET_ADMIN)) return -EPERM;
- return x25_route_ioctl(cmd, (void *)arg);
- case SIOCX25GSUBSCRIP:
- return x25_subscr_ioctl(cmd, (void *)arg);
- case SIOCX25SSUBSCRIP:
- if (!capable(CAP_NET_ADMIN)) return -EPERM;
- return x25_subscr_ioctl(cmd, (void *)arg);
- case SIOCX25GFACILITIES: {
- struct x25_facilities facilities;
- facilities = sk->protinfo.x25->facilities;
- return copy_to_user((void *)arg, &facilities, sizeof(facilities)) ? -EFAULT : 0;
- }
- case SIOCX25SFACILITIES: {
- struct x25_facilities facilities;
- if (copy_from_user(&facilities, (void *)arg, sizeof(facilities)))
- return -EFAULT;
- if (sk->state != TCP_LISTEN && sk->state != TCP_CLOSE)
- return -EINVAL;
- if (facilities.pacsize_in < X25_PS16 || facilities.pacsize_in > X25_PS4096)
- return -EINVAL;
- if (facilities.pacsize_out < X25_PS16 || facilities.pacsize_out > X25_PS4096)
- return -EINVAL;
- if (facilities.winsize_in < 1 || facilities.winsize_in > 127)
- return -EINVAL;
- if (facilities.throughput < 0x03 || facilities.throughput > 0xDD)
- return -EINVAL;
- if (facilities.reverse != 0 && facilities.reverse != 1)
- return -EINVAL;
- sk->protinfo.x25->facilities = facilities;
- return 0;
- }
- case SIOCX25GCALLUSERDATA: {
- struct x25_calluserdata calluserdata;
- calluserdata = sk->protinfo.x25->calluserdata;
- return copy_to_user((void *)arg, &calluserdata, sizeof(calluserdata)) ? -EFAULT : 0;
- }
- case SIOCX25SCALLUSERDATA: {
- struct x25_calluserdata calluserdata;
- if (copy_from_user(&calluserdata, (void *)arg, sizeof(calluserdata)))
- return -EFAULT;
- if (calluserdata.cudlength > X25_MAX_CUD_LEN)
- return -EINVAL;
- sk->protinfo.x25->calluserdata = calluserdata;
- return 0;
- }
- case SIOCX25GCAUSEDIAG: {
- struct x25_causediag causediag;
- causediag = sk->protinfo.x25->causediag;
- return copy_to_user((void *)arg, &causediag, sizeof(causediag)) ? -EFAULT : 0;
- }
- default:
- return dev_ioctl(cmd, (void *)arg);
- }
- /*NOTREACHED*/
- return 0;
- }
- static int x25_get_info(char *buffer, char **start, off_t offset, int length)
- {
- struct sock *s;
- struct net_device *dev;
- const char *devname;
- int len = 0;
- off_t pos = 0;
- off_t begin = 0;
- cli();
- len += sprintf(buffer, "dest_addr src_addr dev lci st vs vr va t t2 t21 t22 t23 Snd-Q Rcv-Q inoden");
- for (s = x25_list; s != NULL; s = s->next) {
- if (s->protinfo.x25->neighbour == NULL || (dev = s->protinfo.x25->neighbour->dev) == NULL)
- devname = "???";
- else
- devname = s->protinfo.x25->neighbour->dev->name;
- len += sprintf(buffer + len, "%-10s %-10s %-5s %3.3X %d %d %d %d %3lu %3lu %3lu %3lu %3lu %5d %5d %ldn",
- (s->protinfo.x25->dest_addr.x25_addr[0] == '') ? "*" : s->protinfo.x25->dest_addr.x25_addr,
- (s->protinfo.x25->source_addr.x25_addr[0] == '') ? "*" : s->protinfo.x25->source_addr.x25_addr,
- devname,
- s->protinfo.x25->lci & 0x0FFF,
- s->protinfo.x25->state,
- s->protinfo.x25->vs,
- s->protinfo.x25->vr,
- s->protinfo.x25->va,
- x25_display_timer(s) / HZ,
- s->protinfo.x25->t2 / HZ,
- s->protinfo.x25->t21 / HZ,
- s->protinfo.x25->t22 / HZ,
- s->protinfo.x25->t23 / HZ,
- atomic_read(&s->wmem_alloc),
- atomic_read(&s->rmem_alloc),
- s->socket != NULL ? s->socket->inode->i_ino : 0L);
- pos = begin + len;
- if (pos < offset) {
- len = 0;
- begin = pos;
- }
- if (pos > offset + length)
- break;
- }
- sti();
- *start = buffer + (offset - begin);
- len -= (offset - begin);
- if (len > length) len = length;
- return(len);
- }
- struct net_proto_family x25_family_ops = {
- family: AF_X25,
- create: x25_create,
- };
- static struct proto_ops SOCKOPS_WRAPPED(x25_proto_ops) = {
- family: AF_X25,
- 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,
- 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,
- };
- #include <linux/smp_lock.h>
- SOCKOPS_WRAP(x25_proto, AF_X25);
- static struct packet_type x25_packet_type = {
- type: __constant_htons(ETH_P_X25),
- func: x25_lapb_receive_frame,
- };
- struct notifier_block x25_dev_notifier = {
- notifier_call: x25_device_event,
- };
- void x25_kill_by_neigh(struct x25_neigh *neigh)
- {
- struct sock *s;
- for( s=x25_list; s != NULL; s=s->next){
- if( s->protinfo.x25->neighbour == neigh )
- x25_disconnect(s, ENETUNREACH, 0, 0);
- }
- }
- static int __init x25_init(void)
- {
- #ifdef MODULE
- struct net_device *dev;
- #endif /* MODULE */
- sock_register(&x25_family_ops);
- dev_add_pack(&x25_packet_type);
- register_netdevice_notifier(&x25_dev_notifier);
- printk(KERN_INFO "X.25 for Linux. Version 0.2 for Linux 2.1.15n");
- #ifdef CONFIG_SYSCTL
- x25_register_sysctl();
- #endif
- proc_net_create("x25", 0, x25_get_info);
- proc_net_create("x25_routes", 0, x25_routes_get_info);
- #ifdef MODULE
- /*
- * Register any pre existing devices.
- */
- read_lock(&dev_base_lock);
- for (dev = dev_base; dev != NULL; dev = dev->next) {
- if ((dev->flags & IFF_UP) && (dev->type == ARPHRD_X25
- #if defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE)
- || dev->type == ARPHRD_ETHER
- #endif
- ))
- x25_link_device_up(dev);
- }
- read_unlock(&dev_base_lock);
- #endif /* MODULE */
- return 0;
- }
- module_init(x25_init);
- EXPORT_NO_SYMBOLS;
- MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
- MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
- MODULE_LICENSE("GPL");
- static void __exit x25_exit(void)
- {
- proc_net_remove("x25");
- proc_net_remove("x25_routes");
- x25_link_free();
- x25_route_free();
- #ifdef CONFIG_SYSCTL
- x25_unregister_sysctl();
- #endif
- unregister_netdevice_notifier(&x25_dev_notifier);
- dev_remove_pack(&x25_packet_type);
- sock_unregister(AF_X25);
- }
- module_exit(x25_exit);