/* * 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 * 2002-10-06 Arnaldo C. Melo Get rid of cli/sti, move proc stuff to * x25_proc.c, using seq_file * 2005-04-02 Shaun Pereira Selective sub address matching * with call user data * 2005-04-15 Shaun Pereira Fast select with no restriction on * response */ #include <linux/config.h> #include <linux/module.h> #include <linux/capability.h> #include <linux/errno.h> #include <linux/kernel.h> #include <linux/sched.h> #include <linux/timer.h> #include <linux/string.h> #include <linux/net.h> #include <linux/netdevice.h> #include <linux/if_arp.h> #include <linux/skbuff.h> #include <net/sock.h> #include <net/tcp_states.h> #include <asm/uaccess.h> #include <linux/fcntl.h> #include <linux/termios.h> /* For TIOCINQ/OUTQ */ #include <linux/notifier.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; HLIST_HEAD(x25_list); DEFINE_RWLOCK(x25_list_lock); static const struct proto_ops x25_proto_ops; static struct x25_address null_x25_address = {" "}; int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr, struct 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 = '\0'; return 1 + (called_len + calling_len + 1) / 2; } int x25_addr_aton(unsigned char *p, struct x25_address *called_addr, struct 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) { write_lock_bh(&x25_list_lock); sk_del_node_init(sk); write_unlock_bh(&x25_list_lock); } /* * Kill all bound sockets on a dropped device. */ static void x25_kill_by_device(struct net_device *dev) { struct sock *s; struct hlist_node *node; write_lock_bh(&x25_list_lock); sk_for_each(s, node, &x25_list) if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev) x25_disconnect(s, ENETUNREACH, 0, 0); write_unlock_bh(&x25_list_lock); } /* * Handle device status changes. */ static int x25_device_event(struct notifier_block *this, unsigned long event, void *ptr) { struct net_device *dev = ptr; struct x25_neigh *nb; 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: nb = x25_get_neigh(dev); if (nb) { x25_terminate_link(nb); x25_neigh_put(nb); } 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) { write_lock_bh(&x25_list_lock); sk_add_node(sk, &x25_list); write_unlock_bh(&x25_list_lock); } /* * Find a socket that wants to accept the Call Request we just * received. Check the full list for an address/cud match. * If no cuds match return the next_best thing, an address match. * Note: if a listening socket has cud set it must only get calls * with matching cud. */ static struct sock *x25_find_listener(struct x25_address *addr, struct sk_buff *skb) { struct sock *s; struct sock *next_best; struct hlist_node *node; read_lock_bh(&x25_list_lock); next_best = NULL; sk_for_each(s, node, &x25_list) if ((!strcmp(addr->x25_addr, x25_sk(s)->source_addr.x25_addr) || !strcmp(addr->x25_addr, null_x25_address.x25_addr)) && s->sk_state == TCP_LISTEN) { /* * Found a listening socket, now check the incoming * call user data vs this sockets call user data */ if(skb->len > 0 && x25_sk(s)->cudmatchlength > 0) { if((memcmp(x25_sk(s)->calluserdata.cuddata, skb->data, x25_sk(s)->cudmatchlength)) == 0) { sock_hold(s); goto found; } } else next_best = s; } if (next_best) { s = next_best; sock_hold(s); goto found; } s = NULL; found: read_unlock_bh(&x25_list_lock); return s; } /* * Find a connected X.25 socket given my LCI and neighbour. */ static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb) { struct sock *s; struct hlist_node *node; sk_for_each(s, node, &x25_list) if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) { sock_hold(s); goto found; } s = NULL; found: return s; } struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb) { struct sock *s; read_lock_bh(&x25_list_lock); s = __x25_find_socket(lci, nb); read_unlock_bh(&x25_list_lock); return s; } /* * Find a unique LCI for a given device. */ static unsigned int x25_new_lci(struct x25_neigh *nb) { unsigned int lci = 1; struct sock *sk; read_lock_bh(&x25_list_lock); while ((sk = __x25_find_socket(lci, nb)) != NULL) { sock_put(sk); if (++lci == 4096) { lci = 0; break; } } read_unlock_bh(&x25_list_lock); 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. * Not static as it's used by the timer */ void x25_destroy_socket(struct sock *sk) { struct sk_buff *skb; sock_hold(sk); lock_sock(sk); x25_stop_heartbeat(sk); x25_stop_timer(sk); x25_remove_socket(sk); x25_clear_queues(sk); /* Flush the queues */ while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { if (skb->sk != sk) { /* A pending connection */ /* * Queue the unaccepted socket for death */ sock_set_flag(skb->sk, SOCK_DEAD); x25_start_heartbeat(skb->sk); x25_sk(skb->sk)->state = X25_STATE_0; } kfree_skb(skb); } if (atomic_read(&sk->sk_wmem_alloc) || atomic_read(&sk->sk_rmem_alloc)) { /* Defer: outstanding buffers */ sk->sk_timer.expires = jiffies + 10 * HZ; sk->sk_timer.function = x25_destroy_timer; sk->sk_timer.data = (unsigned long)sk; add_timer(&sk->sk_timer); } else { /* drop last reference so sock_put will free */ __sock_put(sk); } release_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, char __user *optval, 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 (get_user(opt, (int __user *)optval)) goto out; x25_sk(sk)->qbitincl = !!opt; 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 = x25_sk(sk)->qbitincl; 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; 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; } return rc; } static struct proto x25_proto = { .name = "X25", .owner = THIS_MODULE, .obj_size = sizeof(struct x25_sock), }; static struct sock *x25_alloc_socket(void) { struct x25_sock *x25; struct sock *sk = sk_alloc(AF_X25, GFP_ATOMIC, &x25_proto, 1); 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; } void x25_init_timers(struct sock *sk); static int x25_create(struct socket *sock, int protocol) { struct sock *sk; struct x25_sock *x25; int rc = -ESOCKTNOSUPPORT; if (sock->type != SOCK_SEQPACKET || protocol) goto out; rc = -ENOMEM; if ((sk = x25_alloc_socket()) == 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; x25->accptapprv = X25_DENY_ACCPT_APPRV; /* 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 = X25_DEFAULT_THROUGHPUT; x25->facilities.reverse = X25_DEFAULT_REVERSE; 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()) == NULL) goto out; x25 = x25_sk(sk); sk->sk_type = osk->sk_type; sk->sk_socket = osk->sk_socket; 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_sleep = osk->sk_sleep; 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->facilities = ox25->facilities; x25->qbitincl = ox25->qbitincl; x25->cudmatchlength = ox25->cudmatchlength; x25->accptapprv = ox25->accptapprv; 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) goto out; x25 = x25_sk(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; } sock->sk = NULL; sk->sk_socket = NULL; /* Not used, but we should do this */ out: 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 (!sock_flag(sk, SOCK_ZAPPED) || addr_len != sizeof(struct sockaddr_x25) || addr->sx25_family != AF_X25) return -EINVAL; x25_sk(sk)->source_addr = addr->sx25_addr; x25_insert_socket(sk); sock_reset_flag(sk, SOCK_ZAPPED); SOCK_DEBUG(sk, "x25_bind: socket is bound\n"); return 0; } static int x25_wait_for_connection_establishment(struct sock *sk) { DECLARE_WAITQUEUE(wait, current); int rc; add_wait_queue_exclusive(sk->sk_sleep, &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->sk_sleep, &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; sk->sk_state = TCP_CLOSE; sock->state = SS_UNCONNECTED; rc = -EINVAL; if (addr_len != sizeof(struct sockaddr_x25) || addr->sx25_family != AF_X25) 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_put_neigh; 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_neigh_put(x25->neighbour); out_put_route: x25_route_put(rt); out: release_sock(sk); return rc; } static int x25_wait_for_data(struct sock *sk, int timeout) { DECLARE_WAITQUEUE(wait, current); int rc = 0; add_wait_queue_exclusive(sk->sk_sleep, &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->sk_sleep, &wait); return rc; } static int x25_accept(struct socket *sock, struct socket *newsock, int flags) { struct sock *sk = sock->sk; struct sock *newsk; struct sk_buff *skb; int rc = -EINVAL; if (!sk || sk->sk_state != TCP_LISTEN) goto out; rc = -EOPNOTSUPP; if (sk->sk_type != SOCK_SEQPACKET) goto out; lock_sock(sk); 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; newsk->sk_socket = newsock; newsk->sk_sleep = &newsock->wait; /* Now attach up the new socket */ skb->sk = NULL; kfree_skb(skb); sk->sk_ack_backlog--; newsock->sk = newsk; newsock->state = SS_CONNECTED; rc = 0; out2: release_sock(sk); out: return rc; } 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; struct x25_sock *x25 = x25_sk(sk); if (peer) { if (sk->sk_state != TCP_ESTABLISHED) return -ENOTCONN; sx25->sx25_addr = x25->dest_addr; } else sx25->sx25_addr = x25->source_addr; sx25->sx25_family = AF_X25; *uaddr_len = sizeof(*sx25); return 0; } 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; int 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. */ skb_pull(skb, x25_addr_ntoa(skb->data, &source_addr, &dest_addr)); /* * 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 */ len = skb->data[0] + 1; skb_pull(skb,len); /* * Find a listener for the particular address/cud pair. */ sk = x25_find_listener(&source_addr,skb); skb_push(skb,len); /* * We can't accept the Call Request. */ if (sk == NULL || sk_acceptq_is_full(sk)) goto out_clear_request; /* * Try to reach a compromise on the requested facilities. */ if ((len = x25_negotiate_facilities(skb, sk, &facilities)) == -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; makex25->neighbour = nb; makex25->facilities = facilities; makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask; /* ensure no reverse facil on accept */ makex25->vc_facil_mask &= ~X25_MASK_REVERSE; makex25->cudmatchlength = x25_sk(sk)->cudmatchlength; /* Normally all calls are accepted immediatly */ if(makex25->accptapprv & X25_DENY_ACCPT_APPRV) { x25_write_internal(make, X25_CALL_ACCEPTED); makex25->state = X25_STATE_3; } /* * Incoming Call User Data. */ if (skb->len >= 0) { memcpy(makex25->calluserdata.cuddata, skb->data, skb->len); makex25->calluserdata.cudlength = skb->len; } sk->sk_ack_backlog++; 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, skb->len); 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 kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len) { struct sock *sk = sock->sk; struct x25_sock *x25 = x25_sk(sk); struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)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; 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; } 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; skb = sock_alloc_send_skb(sk, size, noblock, &rc); 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"); asmptr = skb->h.raw = skb_put(skb, len); rc = memcpy_fromiovec(asmptr, msg->msg_iov, 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 (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 (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 { len = x25_output(sk, skb); if (len < 0) kfree_skb(skb); else if (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); rc = len; out: return rc; out_kfree_skb: kfree_skb(skb); goto out; } static int x25_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t size, int flags) { struct sock *sk = sock->sk; struct x25_sock *x25 = x25_sk(sk); struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name; size_t copied; int qbit; struct sk_buff *skb; unsigned char *asmptr; int rc = -ENOTCONN; /* * 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); skb_pull(skb, X25_STD_MIN_LEN); /* * No Q bit information on Interrupt data. */ if (x25->qbitincl) { asmptr = skb_push(skb, 1); *asmptr = 0x00; } msg->msg_flags |= MSG_OOB; } else { /* Now we can treat all alike */ skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, flags & MSG_DONTWAIT, &rc); if (!skb) goto out; qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT; skb_pull(skb, x25->neighbour->extended ? X25_EXT_MIN_LEN : X25_STD_MIN_LEN); if (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; rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); if (rc) goto out_free_dgram; if (sx25) { sx25->sx25_family = AF_X25; sx25->sx25_addr = x25->dest_addr; } msg->msg_namelen = sizeof(struct sockaddr_x25); lock_sock(sk); x25_check_rbuf(sk); release_sock(sk); rc = copied; out_free_dgram: skb_free_datagram(sk, skb); out: 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 = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc); 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 */ if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL) amount = skb->len; rc = put_user(amount, (unsigned int __user *)argp); break; } case SIOCGSTAMP: rc = -EINVAL; if (sk) rc = sock_get_timestamp(sk, (struct timeval __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: { struct x25_facilities fac = x25->facilities; rc = copy_to_user(argp, &fac, sizeof(fac)) ? -EFAULT : 0; break; } case SIOCX25SFACILITIES: { struct x25_facilities facilities; rc = -EFAULT; if (copy_from_user(&facilities, argp, sizeof(facilities))) break; rc = -EINVAL; if (sk->sk_state != TCP_LISTEN && sk->sk_state != TCP_CLOSE) break; if (facilities.pacsize_in < X25_PS16 || facilities.pacsize_in > X25_PS4096) break; if (facilities.pacsize_out < X25_PS16 || facilities.pacsize_out > X25_PS4096) break; if (facilities.winsize_in < 1 || facilities.winsize_in > 127) break; if (facilities.throughput < 0x03 || facilities.throughput > 0xDD) break; if (facilities.reverse && (facilities.reverse | 0x81)!= 0x81) break; x25->facilities = facilities; rc = 0; break; } case SIOCX25GCALLUSERDATA: { struct x25_calluserdata cud = x25->calluserdata; rc = copy_to_user(argp, &cud, sizeof(cud)) ? -EFAULT : 0; 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; x25->calluserdata = calluserdata; rc = 0; break; } case SIOCX25GCAUSEDIAG: { struct x25_causediag causediag; causediag = x25->causediag; rc = copy_to_user(argp, &causediag, sizeof(causediag)) ? -EFAULT : 0; break; } case SIOCX25SCUDMATCHLEN: { struct x25_subaddr sub_addr; rc = -EINVAL; if(sk->sk_state != TCP_CLOSE) break; rc = -EFAULT; if (copy_from_user(&sub_addr, argp, sizeof(sub_addr))) break; rc = -EINVAL; if(sub_addr.cudmatchlength > X25_MAX_CUD_LEN) break; x25->cudmatchlength = sub_addr.cudmatchlength; rc = 0; break; } case SIOCX25CALLACCPTAPPRV: { rc = -EINVAL; if (sk->sk_state != TCP_CLOSE) break; x25->accptapprv = X25_ALLOW_ACCPT_APPRV; rc = 0; break; } case SIOCX25SENDCALLACCPT: { rc = -EINVAL; if (sk->sk_state != TCP_ESTABLISHED) break; if (x25->accptapprv) /* must call accptapprv above */ break; x25_write_internal(sk, X25_CALL_ACCEPTED); x25->state = X25_STATE_3; rc = 0; break; } default: rc = -ENOIOCTLCMD; break; } return rc; } static struct net_proto_family x25_family_ops = { .family = AF_X25, .create = x25_create, .owner = THIS_MODULE, }; static const struct proto_ops SOCKOPS_WRAPPED(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, .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, }; static struct notifier_block x25_dev_notifier = { .notifier_call = x25_device_event, }; void x25_kill_by_neigh(struct x25_neigh *nb) { struct sock *s; struct hlist_node *node; write_lock_bh(&x25_list_lock); sk_for_each(s, node, &x25_list) if (x25_sk(s)->neighbour == nb) x25_disconnect(s, ENETUNREACH, 0, 0); write_unlock_bh(&x25_list_lock); } static int __init x25_init(void) { int rc = proto_register(&x25_proto, 0); if (rc != 0) goto out; 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 2.1.15\n"); #ifdef CONFIG_SYSCTL x25_register_sysctl(); #endif x25_proc_init(); out: return rc; } module_init(x25_init); static void __exit x25_exit(void) { x25_proc_exit(); 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); proto_unregister(&x25_proto); } module_exit(x25_exit); MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>"); MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol"); MODULE_LICENSE("GPL"); MODULE_ALIAS_NETPROTO(PF_X25);