diff options
Diffstat (limited to 'net/ax25/af_ax25.c')
| -rw-r--r-- | net/ax25/af_ax25.c | 2074 |
1 files changed, 2074 insertions, 0 deletions
diff --git a/net/ax25/af_ax25.c b/net/ax25/af_ax25.c new file mode 100644 index 000000000..a1f4cb836 --- /dev/null +++ b/net/ax25/af_ax25.c @@ -0,0 +1,2074 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * + * Copyright (C) Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk) + * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk) + * Copyright (C) Darryl Miles G7LED (dlm@g7led.demon.co.uk) + * Copyright (C) Steven Whitehouse GW7RRM (stevew@acm.org) + * Copyright (C) Joerg Reuter DL1BKE (jreuter@yaina.de) + * Copyright (C) Hans-Joachim Hetscher DD8NE (dd8ne@bnv-bamberg.de) + * Copyright (C) Hans Alblas PE1AYX (hans@esrac.ele.tue.nl) + * Copyright (C) Frederic Rible F1OAT (frible@teaser.fr) + */ +#include <linux/capability.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/signal.h> +#include <linux/timer.h> +#include <linux/string.h> +#include <linux/sockios.h> +#include <linux/net.h> +#include <linux/slab.h> +#include <net/ax25.h> +#include <linux/inet.h> +#include <linux/netdevice.h> +#include <linux/if_arp.h> +#include <linux/skbuff.h> +#include <net/sock.h> +#include <linux/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/stat.h> +#include <linux/sysctl.h> +#include <linux/init.h> +#include <linux/spinlock.h> +#include <net/net_namespace.h> +#include <net/tcp_states.h> +#include <net/ip.h> +#include <net/arp.h> + + + +HLIST_HEAD(ax25_list); +DEFINE_SPINLOCK(ax25_list_lock); + +static const struct proto_ops ax25_proto_ops; + +static void ax25_free_sock(struct sock *sk) +{ + ax25_cb_put(sk_to_ax25(sk)); +} + +/* + * Socket removal during an interrupt is now safe. + */ +static void ax25_cb_del(ax25_cb *ax25) +{ + if (!hlist_unhashed(&ax25->ax25_node)) { + spin_lock_bh(&ax25_list_lock); + hlist_del_init(&ax25->ax25_node); + spin_unlock_bh(&ax25_list_lock); + ax25_cb_put(ax25); + } +} + +/* + * Kill all bound sockets on a dropped device. + */ +static void ax25_kill_by_device(struct net_device *dev) +{ + ax25_dev *ax25_dev; + ax25_cb *s; + struct sock *sk; + + if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL) + return; + + spin_lock_bh(&ax25_list_lock); +again: + ax25_for_each(s, &ax25_list) { + if (s->ax25_dev == ax25_dev) { + sk = s->sk; + if (!sk) { + spin_unlock_bh(&ax25_list_lock); + ax25_disconnect(s, ENETUNREACH); + s->ax25_dev = NULL; + spin_lock_bh(&ax25_list_lock); + goto again; + } + sock_hold(sk); + spin_unlock_bh(&ax25_list_lock); + lock_sock(sk); + ax25_disconnect(s, ENETUNREACH); + s->ax25_dev = NULL; + if (sk->sk_socket) { + dev_put(ax25_dev->dev); + ax25_dev_put(ax25_dev); + } + release_sock(sk); + spin_lock_bh(&ax25_list_lock); + sock_put(sk); + /* The entry could have been deleted from the + * list meanwhile and thus the next pointer is + * no longer valid. Play it safe and restart + * the scan. Forward progress is ensured + * because we set s->ax25_dev to NULL and we + * are never passed a NULL 'dev' argument. + */ + goto again; + } + } + spin_unlock_bh(&ax25_list_lock); +} + +/* + * Handle device status changes. + */ +static int ax25_device_event(struct notifier_block *this, unsigned long event, + void *ptr) +{ + struct net_device *dev = netdev_notifier_info_to_dev(ptr); + + if (!net_eq(dev_net(dev), &init_net)) + return NOTIFY_DONE; + + /* Reject non AX.25 devices */ + if (dev->type != ARPHRD_AX25) + return NOTIFY_DONE; + + switch (event) { + case NETDEV_UP: + ax25_dev_device_up(dev); + break; + case NETDEV_DOWN: + ax25_kill_by_device(dev); + ax25_rt_device_down(dev); + ax25_dev_device_down(dev); + break; + default: + break; + } + + return NOTIFY_DONE; +} + +/* + * Add a socket to the bound sockets list. + */ +void ax25_cb_add(ax25_cb *ax25) +{ + spin_lock_bh(&ax25_list_lock); + ax25_cb_hold(ax25); + hlist_add_head(&ax25->ax25_node, &ax25_list); + spin_unlock_bh(&ax25_list_lock); +} + +/* + * Find a socket that wants to accept the SABM we have just + * received. + */ +struct sock *ax25_find_listener(ax25_address *addr, int digi, + struct net_device *dev, int type) +{ + ax25_cb *s; + + spin_lock(&ax25_list_lock); + ax25_for_each(s, &ax25_list) { + if ((s->iamdigi && !digi) || (!s->iamdigi && digi)) + continue; + if (s->sk && !ax25cmp(&s->source_addr, addr) && + s->sk->sk_type == type && s->sk->sk_state == TCP_LISTEN) { + /* If device is null we match any device */ + if (s->ax25_dev == NULL || s->ax25_dev->dev == dev) { + sock_hold(s->sk); + spin_unlock(&ax25_list_lock); + return s->sk; + } + } + } + spin_unlock(&ax25_list_lock); + + return NULL; +} + +/* + * Find an AX.25 socket given both ends. + */ +struct sock *ax25_get_socket(ax25_address *my_addr, ax25_address *dest_addr, + int type) +{ + struct sock *sk = NULL; + ax25_cb *s; + + spin_lock(&ax25_list_lock); + ax25_for_each(s, &ax25_list) { + if (s->sk && !ax25cmp(&s->source_addr, my_addr) && + !ax25cmp(&s->dest_addr, dest_addr) && + s->sk->sk_type == type) { + sk = s->sk; + sock_hold(sk); + break; + } + } + + spin_unlock(&ax25_list_lock); + + return sk; +} + +/* + * Find an AX.25 control block given both ends. It will only pick up + * floating AX.25 control blocks or non Raw socket bound control blocks. + */ +ax25_cb *ax25_find_cb(ax25_address *src_addr, ax25_address *dest_addr, + ax25_digi *digi, struct net_device *dev) +{ + ax25_cb *s; + + spin_lock_bh(&ax25_list_lock); + ax25_for_each(s, &ax25_list) { + if (s->sk && s->sk->sk_type != SOCK_SEQPACKET) + continue; + if (s->ax25_dev == NULL) + continue; + if (ax25cmp(&s->source_addr, src_addr) == 0 && ax25cmp(&s->dest_addr, dest_addr) == 0 && s->ax25_dev->dev == dev) { + if (digi != NULL && digi->ndigi != 0) { + if (s->digipeat == NULL) + continue; + if (ax25digicmp(s->digipeat, digi) != 0) + continue; + } else { + if (s->digipeat != NULL && s->digipeat->ndigi != 0) + continue; + } + ax25_cb_hold(s); + spin_unlock_bh(&ax25_list_lock); + + return s; + } + } + spin_unlock_bh(&ax25_list_lock); + + return NULL; +} + +EXPORT_SYMBOL(ax25_find_cb); + +void ax25_send_to_raw(ax25_address *addr, struct sk_buff *skb, int proto) +{ + ax25_cb *s; + struct sk_buff *copy; + + spin_lock(&ax25_list_lock); + ax25_for_each(s, &ax25_list) { + if (s->sk != NULL && ax25cmp(&s->source_addr, addr) == 0 && + s->sk->sk_type == SOCK_RAW && + s->sk->sk_protocol == proto && + s->ax25_dev->dev == skb->dev && + atomic_read(&s->sk->sk_rmem_alloc) <= s->sk->sk_rcvbuf) { + if ((copy = skb_clone(skb, GFP_ATOMIC)) == NULL) + continue; + if (sock_queue_rcv_skb(s->sk, copy) != 0) + kfree_skb(copy); + } + } + spin_unlock(&ax25_list_lock); +} + +/* + * Deferred destroy. + */ +void ax25_destroy_socket(ax25_cb *); + +/* + * Handler for deferred kills. + */ +static void ax25_destroy_timer(struct timer_list *t) +{ + ax25_cb *ax25 = from_timer(ax25, t, dtimer); + struct sock *sk; + + sk=ax25->sk; + + bh_lock_sock(sk); + sock_hold(sk); + ax25_destroy_socket(ax25); + bh_unlock_sock(sk); + sock_put(sk); +} + +/* + * 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 ax25_destroy_socket(ax25_cb *ax25) +{ + struct sk_buff *skb; + + ax25_cb_del(ax25); + + ax25_stop_heartbeat(ax25); + ax25_stop_t1timer(ax25); + ax25_stop_t2timer(ax25); + ax25_stop_t3timer(ax25); + ax25_stop_idletimer(ax25); + + ax25_clear_queues(ax25); /* Flush the queues */ + + if (ax25->sk != NULL) { + while ((skb = skb_dequeue(&ax25->sk->sk_receive_queue)) != NULL) { + if (skb->sk != ax25->sk) { + /* A pending connection */ + ax25_cb *sax25 = sk_to_ax25(skb->sk); + + /* Queue the unaccepted socket for death */ + sock_orphan(skb->sk); + + /* 9A4GL: hack to release unaccepted sockets */ + skb->sk->sk_state = TCP_LISTEN; + + ax25_start_heartbeat(sax25); + sax25->state = AX25_STATE_0; + } + + kfree_skb(skb); + } + skb_queue_purge(&ax25->sk->sk_write_queue); + } + + if (ax25->sk != NULL) { + if (sk_has_allocations(ax25->sk)) { + /* Defer: outstanding buffers */ + timer_setup(&ax25->dtimer, ax25_destroy_timer, 0); + ax25->dtimer.expires = jiffies + 2 * HZ; + add_timer(&ax25->dtimer); + } else { + struct sock *sk=ax25->sk; + ax25->sk=NULL; + sock_put(sk); + } + } else { + ax25_cb_put(ax25); + } +} + +/* + * dl1bke 960311: set parameters for existing AX.25 connections, + * includes a KILL command to abort any connection. + * VERY useful for debugging ;-) + */ +static int ax25_ctl_ioctl(const unsigned int cmd, void __user *arg) +{ + struct ax25_ctl_struct ax25_ctl; + ax25_digi digi; + ax25_dev *ax25_dev; + ax25_cb *ax25; + unsigned int k; + int ret = 0; + + if (copy_from_user(&ax25_ctl, arg, sizeof(ax25_ctl))) + return -EFAULT; + + if (ax25_ctl.digi_count > AX25_MAX_DIGIS) + return -EINVAL; + + if (ax25_ctl.arg > ULONG_MAX / HZ && ax25_ctl.cmd != AX25_KILL) + return -EINVAL; + + ax25_dev = ax25_addr_ax25dev(&ax25_ctl.port_addr); + if (!ax25_dev) + return -ENODEV; + + digi.ndigi = ax25_ctl.digi_count; + for (k = 0; k < digi.ndigi; k++) + digi.calls[k] = ax25_ctl.digi_addr[k]; + + ax25 = ax25_find_cb(&ax25_ctl.source_addr, &ax25_ctl.dest_addr, &digi, ax25_dev->dev); + if (!ax25) { + ax25_dev_put(ax25_dev); + return -ENOTCONN; + } + + switch (ax25_ctl.cmd) { + case AX25_KILL: + ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND); +#ifdef CONFIG_AX25_DAMA_SLAVE + if (ax25_dev->dama.slave && ax25->ax25_dev->values[AX25_VALUES_PROTOCOL] == AX25_PROTO_DAMA_SLAVE) + ax25_dama_off(ax25); +#endif + ax25_disconnect(ax25, ENETRESET); + break; + + case AX25_WINDOW: + if (ax25->modulus == AX25_MODULUS) { + if (ax25_ctl.arg < 1 || ax25_ctl.arg > 7) + goto einval_put; + } else { + if (ax25_ctl.arg < 1 || ax25_ctl.arg > 63) + goto einval_put; + } + ax25->window = ax25_ctl.arg; + break; + + case AX25_T1: + if (ax25_ctl.arg < 1 || ax25_ctl.arg > ULONG_MAX / HZ) + goto einval_put; + ax25->rtt = (ax25_ctl.arg * HZ) / 2; + ax25->t1 = ax25_ctl.arg * HZ; + break; + + case AX25_T2: + if (ax25_ctl.arg < 1 || ax25_ctl.arg > ULONG_MAX / HZ) + goto einval_put; + ax25->t2 = ax25_ctl.arg * HZ; + break; + + case AX25_N2: + if (ax25_ctl.arg < 1 || ax25_ctl.arg > 31) + goto einval_put; + ax25->n2count = 0; + ax25->n2 = ax25_ctl.arg; + break; + + case AX25_T3: + if (ax25_ctl.arg > ULONG_MAX / HZ) + goto einval_put; + ax25->t3 = ax25_ctl.arg * HZ; + break; + + case AX25_IDLE: + if (ax25_ctl.arg > ULONG_MAX / (60 * HZ)) + goto einval_put; + + ax25->idle = ax25_ctl.arg * 60 * HZ; + break; + + case AX25_PACLEN: + if (ax25_ctl.arg < 16 || ax25_ctl.arg > 65535) + goto einval_put; + ax25->paclen = ax25_ctl.arg; + break; + + default: + goto einval_put; + } + +out_put: + ax25_dev_put(ax25_dev); + ax25_cb_put(ax25); + return ret; + +einval_put: + ret = -EINVAL; + goto out_put; +} + +static void ax25_fillin_cb_from_dev(ax25_cb *ax25, ax25_dev *ax25_dev) +{ + ax25->rtt = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_T1]) / 2; + ax25->t1 = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_T1]); + ax25->t2 = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_T2]); + ax25->t3 = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_T3]); + ax25->n2 = ax25_dev->values[AX25_VALUES_N2]; + ax25->paclen = ax25_dev->values[AX25_VALUES_PACLEN]; + ax25->idle = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_IDLE]); + ax25->backoff = ax25_dev->values[AX25_VALUES_BACKOFF]; + + if (ax25_dev->values[AX25_VALUES_AXDEFMODE]) { + ax25->modulus = AX25_EMODULUS; + ax25->window = ax25_dev->values[AX25_VALUES_EWINDOW]; + } else { + ax25->modulus = AX25_MODULUS; + ax25->window = ax25_dev->values[AX25_VALUES_WINDOW]; + } +} + +/* + * Fill in a created AX.25 created control block with the default + * values for a particular device. + */ +void ax25_fillin_cb(ax25_cb *ax25, ax25_dev *ax25_dev) +{ + ax25->ax25_dev = ax25_dev; + + if (ax25->ax25_dev != NULL) { + ax25_fillin_cb_from_dev(ax25, ax25_dev); + return; + } + + /* + * No device, use kernel / AX.25 spec default values + */ + ax25->rtt = msecs_to_jiffies(AX25_DEF_T1) / 2; + ax25->t1 = msecs_to_jiffies(AX25_DEF_T1); + ax25->t2 = msecs_to_jiffies(AX25_DEF_T2); + ax25->t3 = msecs_to_jiffies(AX25_DEF_T3); + ax25->n2 = AX25_DEF_N2; + ax25->paclen = AX25_DEF_PACLEN; + ax25->idle = msecs_to_jiffies(AX25_DEF_IDLE); + ax25->backoff = AX25_DEF_BACKOFF; + + if (AX25_DEF_AXDEFMODE) { + ax25->modulus = AX25_EMODULUS; + ax25->window = AX25_DEF_EWINDOW; + } else { + ax25->modulus = AX25_MODULUS; + ax25->window = AX25_DEF_WINDOW; + } +} + +/* + * Create an empty AX.25 control block. + */ +ax25_cb *ax25_create_cb(void) +{ + ax25_cb *ax25; + + if ((ax25 = kzalloc(sizeof(*ax25), GFP_ATOMIC)) == NULL) + return NULL; + + refcount_set(&ax25->refcount, 1); + + skb_queue_head_init(&ax25->write_queue); + skb_queue_head_init(&ax25->frag_queue); + skb_queue_head_init(&ax25->ack_queue); + skb_queue_head_init(&ax25->reseq_queue); + + ax25_setup_timers(ax25); + + ax25_fillin_cb(ax25, NULL); + + ax25->state = AX25_STATE_0; + + return ax25; +} + +/* + * Handling for system calls applied via the various interfaces to an + * AX25 socket object + */ + +static int ax25_setsockopt(struct socket *sock, int level, int optname, + sockptr_t optval, unsigned int optlen) +{ + struct sock *sk = sock->sk; + ax25_cb *ax25; + struct net_device *dev; + char devname[IFNAMSIZ]; + unsigned int opt; + int res = 0; + + if (level != SOL_AX25) + return -ENOPROTOOPT; + + if (optlen < sizeof(unsigned int)) + return -EINVAL; + + if (copy_from_sockptr(&opt, optval, sizeof(unsigned int))) + return -EFAULT; + + lock_sock(sk); + ax25 = sk_to_ax25(sk); + + switch (optname) { + case AX25_WINDOW: + if (ax25->modulus == AX25_MODULUS) { + if (opt < 1 || opt > 7) { + res = -EINVAL; + break; + } + } else { + if (opt < 1 || opt > 63) { + res = -EINVAL; + break; + } + } + ax25->window = opt; + break; + + case AX25_T1: + if (opt < 1 || opt > UINT_MAX / HZ) { + res = -EINVAL; + break; + } + ax25->rtt = (opt * HZ) >> 1; + ax25->t1 = opt * HZ; + break; + + case AX25_T2: + if (opt < 1 || opt > UINT_MAX / HZ) { + res = -EINVAL; + break; + } + ax25->t2 = opt * HZ; + break; + + case AX25_N2: + if (opt < 1 || opt > 31) { + res = -EINVAL; + break; + } + ax25->n2 = opt; + break; + + case AX25_T3: + if (opt < 1 || opt > UINT_MAX / HZ) { + res = -EINVAL; + break; + } + ax25->t3 = opt * HZ; + break; + + case AX25_IDLE: + if (opt > UINT_MAX / (60 * HZ)) { + res = -EINVAL; + break; + } + ax25->idle = opt * 60 * HZ; + break; + + case AX25_BACKOFF: + if (opt > 2) { + res = -EINVAL; + break; + } + ax25->backoff = opt; + break; + + case AX25_EXTSEQ: + ax25->modulus = opt ? AX25_EMODULUS : AX25_MODULUS; + break; + + case AX25_PIDINCL: + ax25->pidincl = opt ? 1 : 0; + break; + + case AX25_IAMDIGI: + ax25->iamdigi = opt ? 1 : 0; + break; + + case AX25_PACLEN: + if (opt < 16 || opt > 65535) { + res = -EINVAL; + break; + } + ax25->paclen = opt; + break; + + case SO_BINDTODEVICE: + if (optlen > IFNAMSIZ - 1) + optlen = IFNAMSIZ - 1; + + memset(devname, 0, sizeof(devname)); + + if (copy_from_sockptr(devname, optval, optlen)) { + res = -EFAULT; + break; + } + + if (sk->sk_type == SOCK_SEQPACKET && + (sock->state != SS_UNCONNECTED || + sk->sk_state == TCP_LISTEN)) { + res = -EADDRNOTAVAIL; + break; + } + + rtnl_lock(); + dev = __dev_get_by_name(&init_net, devname); + if (!dev) { + rtnl_unlock(); + res = -ENODEV; + break; + } + + ax25->ax25_dev = ax25_dev_ax25dev(dev); + if (!ax25->ax25_dev) { + rtnl_unlock(); + res = -ENODEV; + break; + } + ax25_fillin_cb(ax25, ax25->ax25_dev); + rtnl_unlock(); + break; + + default: + res = -ENOPROTOOPT; + } + release_sock(sk); + + return res; +} + +static int ax25_getsockopt(struct socket *sock, int level, int optname, + char __user *optval, int __user *optlen) +{ + struct sock *sk = sock->sk; + ax25_cb *ax25; + struct ax25_dev *ax25_dev; + char devname[IFNAMSIZ]; + void *valptr; + int val = 0; + int maxlen, length; + + if (level != SOL_AX25) + return -ENOPROTOOPT; + + if (get_user(maxlen, optlen)) + return -EFAULT; + + if (maxlen < 1) + return -EFAULT; + + valptr = (void *) &val; + length = min_t(unsigned int, maxlen, sizeof(int)); + + lock_sock(sk); + ax25 = sk_to_ax25(sk); + + switch (optname) { + case AX25_WINDOW: + val = ax25->window; + break; + + case AX25_T1: + val = ax25->t1 / HZ; + break; + + case AX25_T2: + val = ax25->t2 / HZ; + break; + + case AX25_N2: + val = ax25->n2; + break; + + case AX25_T3: + val = ax25->t3 / HZ; + break; + + case AX25_IDLE: + val = ax25->idle / (60 * HZ); + break; + + case AX25_BACKOFF: + val = ax25->backoff; + break; + + case AX25_EXTSEQ: + val = (ax25->modulus == AX25_EMODULUS); + break; + + case AX25_PIDINCL: + val = ax25->pidincl; + break; + + case AX25_IAMDIGI: + val = ax25->iamdigi; + break; + + case AX25_PACLEN: + val = ax25->paclen; + break; + + case SO_BINDTODEVICE: + ax25_dev = ax25->ax25_dev; + + if (ax25_dev != NULL && ax25_dev->dev != NULL) { + strlcpy(devname, ax25_dev->dev->name, sizeof(devname)); + length = strlen(devname) + 1; + } else { + *devname = '\0'; + length = 1; + } + + valptr = (void *) devname; + break; + + default: + release_sock(sk); + return -ENOPROTOOPT; + } + release_sock(sk); + + if (put_user(length, optlen)) + return -EFAULT; + + return copy_to_user(optval, valptr, length) ? -EFAULT : 0; +} + +static int ax25_listen(struct socket *sock, int backlog) +{ + struct sock *sk = sock->sk; + int res = 0; + + lock_sock(sk); + if (sk->sk_type == SOCK_SEQPACKET && sk->sk_state != TCP_LISTEN) { + sk->sk_max_ack_backlog = backlog; + sk->sk_state = TCP_LISTEN; + goto out; + } + res = -EOPNOTSUPP; + +out: + release_sock(sk); + + return res; +} + +/* + * XXX: when creating ax25_sock we should update the .obj_size setting + * below. + */ +static struct proto ax25_proto = { + .name = "AX25", + .owner = THIS_MODULE, + .obj_size = sizeof(struct ax25_sock), +}; + +static int ax25_create(struct net *net, struct socket *sock, int protocol, + int kern) +{ + struct sock *sk; + ax25_cb *ax25; + + if (protocol < 0 || protocol > U8_MAX) + return -EINVAL; + + if (!net_eq(net, &init_net)) + return -EAFNOSUPPORT; + + switch (sock->type) { + case SOCK_DGRAM: + if (protocol == 0 || protocol == PF_AX25) + protocol = AX25_P_TEXT; + break; + + case SOCK_SEQPACKET: + switch (protocol) { + case 0: + case PF_AX25: /* For CLX */ + protocol = AX25_P_TEXT; + break; + case AX25_P_SEGMENT: +#ifdef CONFIG_INET + case AX25_P_ARP: + case AX25_P_IP: +#endif +#ifdef CONFIG_NETROM + case AX25_P_NETROM: +#endif +#ifdef CONFIG_ROSE + case AX25_P_ROSE: +#endif + return -ESOCKTNOSUPPORT; +#ifdef CONFIG_NETROM_MODULE + case AX25_P_NETROM: + if (ax25_protocol_is_registered(AX25_P_NETROM)) + return -ESOCKTNOSUPPORT; + break; +#endif +#ifdef CONFIG_ROSE_MODULE + case AX25_P_ROSE: + if (ax25_protocol_is_registered(AX25_P_ROSE)) + return -ESOCKTNOSUPPORT; +#endif + default: + break; + } + break; + + case SOCK_RAW: + if (!capable(CAP_NET_RAW)) + return -EPERM; + break; + default: + return -ESOCKTNOSUPPORT; + } + + sk = sk_alloc(net, PF_AX25, GFP_ATOMIC, &ax25_proto, kern); + if (sk == NULL) + return -ENOMEM; + + ax25 = ax25_sk(sk)->cb = ax25_create_cb(); + if (!ax25) { + sk_free(sk); + return -ENOMEM; + } + + sock_init_data(sock, sk); + + sk->sk_destruct = ax25_free_sock; + sock->ops = &ax25_proto_ops; + sk->sk_protocol = protocol; + + ax25->sk = sk; + + return 0; +} + +struct sock *ax25_make_new(struct sock *osk, struct ax25_dev *ax25_dev) +{ + struct sock *sk; + ax25_cb *ax25, *oax25; + + sk = sk_alloc(sock_net(osk), PF_AX25, GFP_ATOMIC, osk->sk_prot, 0); + if (sk == NULL) + return NULL; + + if ((ax25 = ax25_create_cb()) == NULL) { + sk_free(sk); + return NULL; + } + + switch (osk->sk_type) { + case SOCK_DGRAM: + break; + case SOCK_SEQPACKET: + break; + default: + sk_free(sk); + ax25_cb_put(ax25); + return NULL; + } + + sock_init_data(NULL, 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; + sock_copy_flags(sk, osk); + + oax25 = sk_to_ax25(osk); + + ax25->modulus = oax25->modulus; + ax25->backoff = oax25->backoff; + ax25->pidincl = oax25->pidincl; + ax25->iamdigi = oax25->iamdigi; + ax25->rtt = oax25->rtt; + ax25->t1 = oax25->t1; + ax25->t2 = oax25->t2; + ax25->t3 = oax25->t3; + ax25->n2 = oax25->n2; + ax25->idle = oax25->idle; + ax25->paclen = oax25->paclen; + ax25->window = oax25->window; + + ax25->ax25_dev = ax25_dev; + ax25->source_addr = oax25->source_addr; + + if (oax25->digipeat != NULL) { + ax25->digipeat = kmemdup(oax25->digipeat, sizeof(ax25_digi), + GFP_ATOMIC); + if (ax25->digipeat == NULL) { + sk_free(sk); + ax25_cb_put(ax25); + return NULL; + } + } + + ax25_sk(sk)->cb = ax25; + sk->sk_destruct = ax25_free_sock; + ax25->sk = sk; + + return sk; +} + +static int ax25_release(struct socket *sock) +{ + struct sock *sk = sock->sk; + ax25_cb *ax25; + ax25_dev *ax25_dev; + + if (sk == NULL) + return 0; + + sock_hold(sk); + lock_sock(sk); + sock_orphan(sk); + ax25 = sk_to_ax25(sk); + ax25_dev = ax25->ax25_dev; + + if (sk->sk_type == SOCK_SEQPACKET) { + switch (ax25->state) { + case AX25_STATE_0: + release_sock(sk); + ax25_disconnect(ax25, 0); + lock_sock(sk); + ax25_destroy_socket(ax25); + break; + + case AX25_STATE_1: + case AX25_STATE_2: + ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND); + release_sock(sk); + ax25_disconnect(ax25, 0); + lock_sock(sk); + if (!sock_flag(ax25->sk, SOCK_DESTROY)) + ax25_destroy_socket(ax25); + break; + + case AX25_STATE_3: + case AX25_STATE_4: + ax25_clear_queues(ax25); + ax25->n2count = 0; + + switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) { + case AX25_PROTO_STD_SIMPLEX: + case AX25_PROTO_STD_DUPLEX: + ax25_send_control(ax25, + AX25_DISC, + AX25_POLLON, + AX25_COMMAND); + ax25_stop_t2timer(ax25); + ax25_stop_t3timer(ax25); + ax25_stop_idletimer(ax25); + break; +#ifdef CONFIG_AX25_DAMA_SLAVE + case AX25_PROTO_DAMA_SLAVE: + ax25_stop_t3timer(ax25); + ax25_stop_idletimer(ax25); + break; +#endif + } + ax25_calculate_t1(ax25); + ax25_start_t1timer(ax25); + ax25->state = AX25_STATE_2; + sk->sk_state = TCP_CLOSE; + sk->sk_shutdown |= SEND_SHUTDOWN; + sk->sk_state_change(sk); + sock_set_flag(sk, SOCK_DESTROY); + break; + + default: + break; + } + } else { + sk->sk_state = TCP_CLOSE; + sk->sk_shutdown |= SEND_SHUTDOWN; + sk->sk_state_change(sk); + ax25_destroy_socket(ax25); + } + if (ax25_dev) { + del_timer_sync(&ax25->timer); + del_timer_sync(&ax25->t1timer); + del_timer_sync(&ax25->t2timer); + del_timer_sync(&ax25->t3timer); + del_timer_sync(&ax25->idletimer); + dev_put(ax25_dev->dev); + ax25_dev_put(ax25_dev); + } + + sock->sk = NULL; + release_sock(sk); + sock_put(sk); + + return 0; +} + +/* + * We support a funny extension here so you can (as root) give any callsign + * digipeated via a local address as source. This hack is obsolete now + * that we've implemented support for SO_BINDTODEVICE. It is however small + * and trivially backward compatible. + */ +static int ax25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) +{ + struct sock *sk = sock->sk; + struct full_sockaddr_ax25 *addr = (struct full_sockaddr_ax25 *)uaddr; + ax25_dev *ax25_dev = NULL; + ax25_uid_assoc *user; + ax25_address call; + ax25_cb *ax25; + int err = 0; + + if (addr_len != sizeof(struct sockaddr_ax25) && + addr_len != sizeof(struct full_sockaddr_ax25)) + /* support for old structure may go away some time + * ax25_bind(): uses old (6 digipeater) socket structure. + */ + if ((addr_len < sizeof(struct sockaddr_ax25) + sizeof(ax25_address) * 6) || + (addr_len > sizeof(struct full_sockaddr_ax25))) + return -EINVAL; + + if (addr->fsa_ax25.sax25_family != AF_AX25) + return -EINVAL; + + user = ax25_findbyuid(current_euid()); + if (user) { + call = user->call; + ax25_uid_put(user); + } else { + if (ax25_uid_policy && !capable(CAP_NET_ADMIN)) + return -EACCES; + + call = addr->fsa_ax25.sax25_call; + } + + lock_sock(sk); + + ax25 = sk_to_ax25(sk); + if (!sock_flag(sk, SOCK_ZAPPED)) { + err = -EINVAL; + goto out; + } + + ax25->source_addr = call; + + /* + * User already set interface with SO_BINDTODEVICE + */ + if (ax25->ax25_dev != NULL) + goto done; + + if (addr_len > sizeof(struct sockaddr_ax25) && addr->fsa_ax25.sax25_ndigis == 1) { + if (ax25cmp(&addr->fsa_digipeater[0], &null_ax25_address) != 0 && + (ax25_dev = ax25_addr_ax25dev(&addr->fsa_digipeater[0])) == NULL) { + err = -EADDRNOTAVAIL; + goto out; + } + } else { + if ((ax25_dev = ax25_addr_ax25dev(&addr->fsa_ax25.sax25_call)) == NULL) { + err = -EADDRNOTAVAIL; + goto out; + } + } + + if (ax25_dev) { + ax25_fillin_cb(ax25, ax25_dev); + dev_hold(ax25_dev->dev); + } + +done: + ax25_cb_add(ax25); + sock_reset_flag(sk, SOCK_ZAPPED); + +out: + release_sock(sk); + + return err; +} + +/* + * FIXME: nonblock behaviour looks like it may have a bug. + */ +static int __must_check ax25_connect(struct socket *sock, + struct sockaddr *uaddr, int addr_len, int flags) +{ + struct sock *sk = sock->sk; + ax25_cb *ax25 = sk_to_ax25(sk), *ax25t; + struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)uaddr; + ax25_digi *digi = NULL; + int ct = 0, err = 0; + + /* + * some sanity checks. code further down depends on this + */ + + if (addr_len == sizeof(struct sockaddr_ax25)) + /* support for this will go away in early 2.5.x + * ax25_connect(): uses obsolete socket structure + */ + ; + else if (addr_len != sizeof(struct full_sockaddr_ax25)) + /* support for old structure may go away some time + * ax25_connect(): uses old (6 digipeater) socket structure. + */ + if ((addr_len < sizeof(struct sockaddr_ax25) + sizeof(ax25_address) * 6) || + (addr_len > sizeof(struct full_sockaddr_ax25))) + return -EINVAL; + + + if (fsa->fsa_ax25.sax25_family != AF_AX25) + return -EINVAL; + + lock_sock(sk); + + /* deal with restarts */ + if (sock->state == SS_CONNECTING) { + switch (sk->sk_state) { + case TCP_SYN_SENT: /* still trying */ + err = -EINPROGRESS; + goto out_release; + + case TCP_ESTABLISHED: /* connection established */ + sock->state = SS_CONNECTED; + goto out_release; + + case TCP_CLOSE: /* connection refused */ + sock->state = SS_UNCONNECTED; + err = -ECONNREFUSED; + goto out_release; + } + } + + if (sk->sk_state == TCP_ESTABLISHED && sk->sk_type == SOCK_SEQPACKET) { + err = -EISCONN; /* No reconnect on a seqpacket socket */ + goto out_release; + } + + sk->sk_state = TCP_CLOSE; + sock->state = SS_UNCONNECTED; + + kfree(ax25->digipeat); + ax25->digipeat = NULL; + + /* + * Handle digi-peaters to be used. + */ + if (addr_len > sizeof(struct sockaddr_ax25) && + fsa->fsa_ax25.sax25_ndigis != 0) { + /* Valid number of digipeaters ? */ + if (fsa->fsa_ax25.sax25_ndigis < 1 || + fsa->fsa_ax25.sax25_ndigis > AX25_MAX_DIGIS || + addr_len < sizeof(struct sockaddr_ax25) + + sizeof(ax25_address) * fsa->fsa_ax25.sax25_ndigis) { + err = -EINVAL; + goto out_release; + } + + if ((digi = kmalloc(sizeof(ax25_digi), GFP_KERNEL)) == NULL) { + err = -ENOBUFS; + goto out_release; + } + + digi->ndigi = fsa->fsa_ax25.sax25_ndigis; + digi->lastrepeat = -1; + + while (ct < fsa->fsa_ax25.sax25_ndigis) { + if ((fsa->fsa_digipeater[ct].ax25_call[6] & + AX25_HBIT) && ax25->iamdigi) { + digi->repeated[ct] = 1; + digi->lastrepeat = ct; + } else { + digi->repeated[ct] = 0; + } + digi->calls[ct] = fsa->fsa_digipeater[ct]; + ct++; + } + } + + /* + * Must bind first - autobinding in this may or may not work. If + * the socket is already bound, check to see if the device has + * been filled in, error if it hasn't. + */ + if (sock_flag(sk, SOCK_ZAPPED)) { + /* check if we can remove this feature. It is broken. */ + printk(KERN_WARNING "ax25_connect(): %s uses autobind, please contact jreuter@yaina.de\n", + current->comm); + if ((err = ax25_rt_autobind(ax25, &fsa->fsa_ax25.sax25_call)) < 0) { + kfree(digi); + goto out_release; + } + + ax25_fillin_cb(ax25, ax25->ax25_dev); + ax25_cb_add(ax25); + } else { + if (ax25->ax25_dev == NULL) { + kfree(digi); + err = -EHOSTUNREACH; + goto out_release; + } + } + + if (sk->sk_type == SOCK_SEQPACKET && + (ax25t=ax25_find_cb(&ax25->source_addr, &fsa->fsa_ax25.sax25_call, digi, + ax25->ax25_dev->dev))) { + kfree(digi); + err = -EADDRINUSE; /* Already such a connection */ + ax25_cb_put(ax25t); + goto out_release; + } + + ax25->dest_addr = fsa->fsa_ax25.sax25_call; + ax25->digipeat = digi; + + /* First the easy one */ + if (sk->sk_type != SOCK_SEQPACKET) { + sock->state = SS_CONNECTED; + sk->sk_state = TCP_ESTABLISHED; + goto out_release; + } + + /* Move to connecting socket, ax.25 lapb WAIT_UA.. */ + sock->state = SS_CONNECTING; + sk->sk_state = TCP_SYN_SENT; + + switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) { + case AX25_PROTO_STD_SIMPLEX: + case AX25_PROTO_STD_DUPLEX: + ax25_std_establish_data_link(ax25); + break; + +#ifdef CONFIG_AX25_DAMA_SLAVE + case AX25_PROTO_DAMA_SLAVE: + ax25->modulus = AX25_MODULUS; + ax25->window = ax25->ax25_dev->values[AX25_VALUES_WINDOW]; + if (ax25->ax25_dev->dama.slave) + ax25_ds_establish_data_link(ax25); + else + ax25_std_establish_data_link(ax25); + break; +#endif + } + + ax25->state = AX25_STATE_1; + + ax25_start_heartbeat(ax25); + + /* Now the loop */ + if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) { + err = -EINPROGRESS; + goto out_release; + } + + if (sk->sk_state == TCP_SYN_SENT) { + DEFINE_WAIT(wait); + + for (;;) { + prepare_to_wait(sk_sleep(sk), &wait, + TASK_INTERRUPTIBLE); + if (sk->sk_state != TCP_SYN_SENT) + break; + if (!signal_pending(current)) { + release_sock(sk); + schedule(); + lock_sock(sk); + continue; + } + err = -ERESTARTSYS; + break; + } + finish_wait(sk_sleep(sk), &wait); + + if (err) + goto out_release; + } + + if (sk->sk_state != TCP_ESTABLISHED) { + /* Not in ABM, not in WAIT_UA -> failed */ + sock->state = SS_UNCONNECTED; + err = sock_error(sk); /* Always set at this point */ + goto out_release; + } + + sock->state = SS_CONNECTED; + + err = 0; +out_release: + release_sock(sk); + + return err; +} + +static int ax25_accept(struct socket *sock, struct socket *newsock, int flags, + bool kern) +{ + struct sk_buff *skb; + struct sock *newsk; + DEFINE_WAIT(wait); + struct sock *sk; + int err = 0; + + if (sock->state != SS_UNCONNECTED) + return -EINVAL; + + if ((sk = sock->sk) == NULL) + return -EINVAL; + + lock_sock(sk); + if (sk->sk_type != SOCK_SEQPACKET) { + err = -EOPNOTSUPP; + goto out; + } + + if (sk->sk_state != TCP_LISTEN) { + err = -EINVAL; + goto out; + } + + /* + * The read queue this time is holding sockets ready to use + * hooked into the SABM we saved + */ + for (;;) { + prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); + skb = skb_dequeue(&sk->sk_receive_queue); + if (skb) + break; + + if (flags & O_NONBLOCK) { + err = -EWOULDBLOCK; + break; + } + if (!signal_pending(current)) { + release_sock(sk); + schedule(); + lock_sock(sk); + continue; + } + err = -ERESTARTSYS; + break; + } + finish_wait(sk_sleep(sk), &wait); + + if (err) + goto out; + + newsk = skb->sk; + sock_graft(newsk, newsock); + + /* Now attach up the new socket */ + kfree_skb(skb); + sk_acceptq_removed(sk); + newsock->state = SS_CONNECTED; + +out: + release_sock(sk); + + return err; +} + +static int ax25_getname(struct socket *sock, struct sockaddr *uaddr, + int peer) +{ + struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)uaddr; + struct sock *sk = sock->sk; + unsigned char ndigi, i; + ax25_cb *ax25; + int err = 0; + + memset(fsa, 0, sizeof(*fsa)); + lock_sock(sk); + ax25 = sk_to_ax25(sk); + + if (peer != 0) { + if (sk->sk_state != TCP_ESTABLISHED) { + err = -ENOTCONN; + goto out; + } + + fsa->fsa_ax25.sax25_family = AF_AX25; + fsa->fsa_ax25.sax25_call = ax25->dest_addr; + + if (ax25->digipeat != NULL) { + ndigi = ax25->digipeat->ndigi; + fsa->fsa_ax25.sax25_ndigis = ndigi; + for (i = 0; i < ndigi; i++) + fsa->fsa_digipeater[i] = + ax25->digipeat->calls[i]; + } + } else { + fsa->fsa_ax25.sax25_family = AF_AX25; + fsa->fsa_ax25.sax25_call = ax25->source_addr; + fsa->fsa_ax25.sax25_ndigis = 1; + if (ax25->ax25_dev != NULL) { + memcpy(&fsa->fsa_digipeater[0], + ax25->ax25_dev->dev->dev_addr, AX25_ADDR_LEN); + } else { + fsa->fsa_digipeater[0] = null_ax25_address; + } + } + err = sizeof (struct full_sockaddr_ax25); + +out: + release_sock(sk); + + return err; +} + +static int ax25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) +{ + DECLARE_SOCKADDR(struct sockaddr_ax25 *, usax, msg->msg_name); + struct sock *sk = sock->sk; + struct sockaddr_ax25 sax; + struct sk_buff *skb; + ax25_digi dtmp, *dp; + ax25_cb *ax25; + size_t size; + int lv, err, addr_len = msg->msg_namelen; + + if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_CMSG_COMPAT)) + return -EINVAL; + + lock_sock(sk); + ax25 = sk_to_ax25(sk); + + if (sock_flag(sk, SOCK_ZAPPED)) { + err = -EADDRNOTAVAIL; + goto out; + } + + if (sk->sk_shutdown & SEND_SHUTDOWN) { + send_sig(SIGPIPE, current, 0); + err = -EPIPE; + goto out; + } + + if (ax25->ax25_dev == NULL) { + err = -ENETUNREACH; + goto out; + } + + if (len > ax25->ax25_dev->dev->mtu) { + err = -EMSGSIZE; + goto out; + } + + if (usax != NULL) { + if (usax->sax25_family != AF_AX25) { + err = -EINVAL; + goto out; + } + + if (addr_len == sizeof(struct sockaddr_ax25)) + /* ax25_sendmsg(): uses obsolete socket structure */ + ; + else if (addr_len != sizeof(struct full_sockaddr_ax25)) + /* support for old structure may go away some time + * ax25_sendmsg(): uses old (6 digipeater) + * socket structure. + */ + if ((addr_len < sizeof(struct sockaddr_ax25) + sizeof(ax25_address) * 6) || + (addr_len > sizeof(struct full_sockaddr_ax25))) { + err = -EINVAL; + goto out; + } + + + if (addr_len > sizeof(struct sockaddr_ax25) && usax->sax25_ndigis != 0) { + int ct = 0; + struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)usax; + + /* Valid number of digipeaters ? */ + if (usax->sax25_ndigis < 1 || + usax->sax25_ndigis > AX25_MAX_DIGIS || + addr_len < sizeof(struct sockaddr_ax25) + + sizeof(ax25_address) * usax->sax25_ndigis) { + err = -EINVAL; + goto out; + } + + dtmp.ndigi = usax->sax25_ndigis; + + while (ct < usax->sax25_ndigis) { + dtmp.repeated[ct] = 0; + dtmp.calls[ct] = fsa->fsa_digipeater[ct]; + ct++; + } + + dtmp.lastrepeat = 0; + } + + sax = *usax; + if (sk->sk_type == SOCK_SEQPACKET && + ax25cmp(&ax25->dest_addr, &sax.sax25_call)) { + err = -EISCONN; + goto out; + } + if (usax->sax25_ndigis == 0) + dp = NULL; + else + dp = &dtmp; + } else { + /* + * FIXME: 1003.1g - if the socket is like this because + * it has become closed (not started closed) and is VC + * we ought to SIGPIPE, EPIPE + */ + if (sk->sk_state != TCP_ESTABLISHED) { + err = -ENOTCONN; + goto out; + } + sax.sax25_family = AF_AX25; + sax.sax25_call = ax25->dest_addr; + dp = ax25->digipeat; + } + + /* Build a packet */ + /* Assume the worst case */ + size = len + ax25->ax25_dev->dev->hard_header_len; + + skb = sock_alloc_send_skb(sk, size, msg->msg_flags&MSG_DONTWAIT, &err); + if (skb == NULL) + goto out; + + skb_reserve(skb, size - len); + + /* User data follows immediately after the AX.25 data */ + if (memcpy_from_msg(skb_put(skb, len), msg, len)) { + err = -EFAULT; + kfree_skb(skb); + goto out; + } + + skb_reset_network_header(skb); + + /* Add the PID if one is not supplied by the user in the skb */ + if (!ax25->pidincl) + *(u8 *)skb_push(skb, 1) = sk->sk_protocol; + + if (sk->sk_type == SOCK_SEQPACKET) { + /* Connected mode sockets go via the LAPB machine */ + if (sk->sk_state != TCP_ESTABLISHED) { + kfree_skb(skb); + err = -ENOTCONN; + goto out; + } + + /* Shove it onto the queue and kick */ + ax25_output(ax25, ax25->paclen, skb); + + err = len; + goto out; + } + + skb_push(skb, 1 + ax25_addr_size(dp)); + + /* Building AX.25 Header */ + + /* Build an AX.25 header */ + lv = ax25_addr_build(skb->data, &ax25->source_addr, &sax.sax25_call, + dp, AX25_COMMAND, AX25_MODULUS); + + skb_set_transport_header(skb, lv); + + *skb_transport_header(skb) = AX25_UI; + + /* Datagram frames go straight out of the door as UI */ + ax25_queue_xmit(skb, ax25->ax25_dev->dev); + + err = len; + +out: + release_sock(sk); + + return err; +} + +static int ax25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, + int flags) +{ + struct sock *sk = sock->sk; + struct sk_buff *skb, *last; + struct sk_buff_head *sk_queue; + int copied; + int err = 0; + int off = 0; + long timeo; + + lock_sock(sk); + /* + * This works for seqpacket too. The receiver has ordered the + * queue for us! We do one quick check first though + */ + if (sk->sk_type == SOCK_SEQPACKET && sk->sk_state != TCP_ESTABLISHED) { + err = -ENOTCONN; + goto out; + } + + /* We need support for non-blocking reads. */ + sk_queue = &sk->sk_receive_queue; + skb = __skb_try_recv_datagram(sk, sk_queue, flags, &off, &err, &last); + /* If no packet is available, release_sock(sk) and try again. */ + if (!skb) { + if (err != -EAGAIN) + goto out; + release_sock(sk); + timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); + while (timeo && !__skb_wait_for_more_packets(sk, sk_queue, &err, + &timeo, last)) { + skb = __skb_try_recv_datagram(sk, sk_queue, flags, &off, + &err, &last); + if (skb) + break; + + if (err != -EAGAIN) + goto done; + } + if (!skb) + goto done; + lock_sock(sk); + } + + if (!sk_to_ax25(sk)->pidincl) + skb_pull(skb, 1); /* Remove PID */ + + skb_reset_transport_header(skb); + copied = skb->len; + + if (copied > size) { + copied = size; + msg->msg_flags |= MSG_TRUNC; + } + + skb_copy_datagram_msg(skb, 0, msg, copied); + + if (msg->msg_name) { + ax25_digi digi; + ax25_address src; + const unsigned char *mac = skb_mac_header(skb); + DECLARE_SOCKADDR(struct sockaddr_ax25 *, sax, msg->msg_name); + + memset(sax, 0, sizeof(struct full_sockaddr_ax25)); + ax25_addr_parse(mac + 1, skb->data - mac - 1, &src, NULL, + &digi, NULL, NULL); + sax->sax25_family = AF_AX25; + /* We set this correctly, even though we may not let the + application know the digi calls further down (because it + did NOT ask to know them). This could get political... **/ + sax->sax25_ndigis = digi.ndigi; + sax->sax25_call = src; + + if (sax->sax25_ndigis != 0) { + int ct; + struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)sax; + + for (ct = 0; ct < digi.ndigi; ct++) + fsa->fsa_digipeater[ct] = digi.calls[ct]; + } + msg->msg_namelen = sizeof(struct full_sockaddr_ax25); + } + + skb_free_datagram(sk, skb); + err = copied; + +out: + release_sock(sk); + +done: + return err; +} + +static int ax25_shutdown(struct socket *sk, int how) +{ + /* FIXME - generate DM and RNR states */ + return -EOPNOTSUPP; +} + +static int ax25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) +{ + struct sock *sk = sock->sk; + void __user *argp = (void __user *)arg; + int res = 0; + + lock_sock(sk); + switch (cmd) { + case TIOCOUTQ: { + long amount; + + amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk); + if (amount < 0) + amount = 0; + res = put_user(amount, (int __user *)argp); + break; + } + + case TIOCINQ: { + struct sk_buff *skb; + long amount = 0L; + /* 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; + res = put_user(amount, (int __user *) argp); + break; + } + + case SIOCAX25ADDUID: /* Add a uid to the uid/call map table */ + case SIOCAX25DELUID: /* Delete a uid from the uid/call map table */ + case SIOCAX25GETUID: { + struct sockaddr_ax25 sax25; + if (copy_from_user(&sax25, argp, sizeof(sax25))) { + res = -EFAULT; + break; + } + res = ax25_uid_ioctl(cmd, &sax25); + break; + } + + case SIOCAX25NOUID: { /* Set the default policy (default/bar) */ + long amount; + if (!capable(CAP_NET_ADMIN)) { + res = -EPERM; + break; + } + if (get_user(amount, (long __user *)argp)) { + res = -EFAULT; + break; + } + if (amount < 0 || amount > AX25_NOUID_BLOCK) { + res = -EINVAL; + break; + } + ax25_uid_policy = amount; + res = 0; + break; + } + + case SIOCADDRT: + case SIOCDELRT: + case SIOCAX25OPTRT: + if (!capable(CAP_NET_ADMIN)) { + res = -EPERM; + break; + } + res = ax25_rt_ioctl(cmd, argp); + break; + + case SIOCAX25CTLCON: + if (!capable(CAP_NET_ADMIN)) { + res = -EPERM; + break; + } + res = ax25_ctl_ioctl(cmd, argp); + break; + + case SIOCAX25GETINFO: + case SIOCAX25GETINFOOLD: { + ax25_cb *ax25 = sk_to_ax25(sk); + struct ax25_info_struct ax25_info; + + ax25_info.t1 = ax25->t1 / HZ; + ax25_info.t2 = ax25->t2 / HZ; + ax25_info.t3 = ax25->t3 / HZ; + ax25_info.idle = ax25->idle / (60 * HZ); + ax25_info.n2 = ax25->n2; + ax25_info.t1timer = ax25_display_timer(&ax25->t1timer) / HZ; + ax25_info.t2timer = ax25_display_timer(&ax25->t2timer) / HZ; + ax25_info.t3timer = ax25_display_timer(&ax25->t3timer) / HZ; + ax25_info.idletimer = ax25_display_timer(&ax25->idletimer) / (60 * HZ); + ax25_info.n2count = ax25->n2count; + ax25_info.state = ax25->state; + ax25_info.rcv_q = sk_rmem_alloc_get(sk); + ax25_info.snd_q = sk_wmem_alloc_get(sk); + ax25_info.vs = ax25->vs; + ax25_info.vr = ax25->vr; + ax25_info.va = ax25->va; + ax25_info.vs_max = ax25->vs; /* reserved */ + ax25_info.paclen = ax25->paclen; + ax25_info.window = ax25->window; + + /* old structure? */ + if (cmd == SIOCAX25GETINFOOLD) { + static int warned = 0; + if (!warned) { + printk(KERN_INFO "%s uses old SIOCAX25GETINFO\n", + current->comm); + warned=1; + } + + if (copy_to_user(argp, &ax25_info, sizeof(struct ax25_info_struct_deprecated))) { + res = -EFAULT; + break; + } + } else { + if (copy_to_user(argp, &ax25_info, sizeof(struct ax25_info_struct))) { + res = -EINVAL; + break; + } + } + res = 0; + break; + } + + case SIOCAX25ADDFWD: + case SIOCAX25DELFWD: { + struct ax25_fwd_struct ax25_fwd; + if (!capable(CAP_NET_ADMIN)) { + res = -EPERM; + break; + } + if (copy_from_user(&ax25_fwd, argp, sizeof(ax25_fwd))) { + res = -EFAULT; + break; + } + res = ax25_fwd_ioctl(cmd, &ax25_fwd); + break; + } + + case SIOCGIFADDR: + case SIOCSIFADDR: + case SIOCGIFDSTADDR: + case SIOCSIFDSTADDR: + case SIOCGIFBRDADDR: + case SIOCSIFBRDADDR: + case SIOCGIFNETMASK: + case SIOCSIFNETMASK: + case SIOCGIFMETRIC: + case SIOCSIFMETRIC: + res = -EINVAL; + break; + + default: + res = -ENOIOCTLCMD; + break; + } + release_sock(sk); + + return res; +} + +#ifdef CONFIG_PROC_FS + +static void *ax25_info_start(struct seq_file *seq, loff_t *pos) + __acquires(ax25_list_lock) +{ + spin_lock_bh(&ax25_list_lock); + return seq_hlist_start(&ax25_list, *pos); +} + +static void *ax25_info_next(struct seq_file *seq, void *v, loff_t *pos) +{ + return seq_hlist_next(v, &ax25_list, pos); +} + +static void ax25_info_stop(struct seq_file *seq, void *v) + __releases(ax25_list_lock) +{ + spin_unlock_bh(&ax25_list_lock); +} + +static int ax25_info_show(struct seq_file *seq, void *v) +{ + ax25_cb *ax25 = hlist_entry(v, struct ax25_cb, ax25_node); + char buf[11]; + int k; + + + /* + * New format: + * magic dev src_addr dest_addr,digi1,digi2,.. st vs vr va t1 t1 t2 t2 t3 t3 idle idle n2 n2 rtt window paclen Snd-Q Rcv-Q inode + */ + + seq_printf(seq, "%p %s %s%s ", + ax25, + ax25->ax25_dev == NULL? "???" : ax25->ax25_dev->dev->name, + ax2asc(buf, &ax25->source_addr), + ax25->iamdigi? "*":""); + seq_printf(seq, "%s", ax2asc(buf, &ax25->dest_addr)); + + for (k=0; (ax25->digipeat != NULL) && (k < ax25->digipeat->ndigi); k++) { + seq_printf(seq, ",%s%s", + ax2asc(buf, &ax25->digipeat->calls[k]), + ax25->digipeat->repeated[k]? "*":""); + } + + seq_printf(seq, " %d %d %d %d %lu %lu %lu %lu %lu %lu %lu %lu %d %d %lu %d %d", + ax25->state, + ax25->vs, ax25->vr, ax25->va, + ax25_display_timer(&ax25->t1timer) / HZ, ax25->t1 / HZ, + ax25_display_timer(&ax25->t2timer) / HZ, ax25->t2 / HZ, + ax25_display_timer(&ax25->t3timer) / HZ, ax25->t3 / HZ, + ax25_display_timer(&ax25->idletimer) / (60 * HZ), + ax25->idle / (60 * HZ), + ax25->n2count, ax25->n2, + ax25->rtt / HZ, + ax25->window, + ax25->paclen); + + if (ax25->sk != NULL) { + seq_printf(seq, " %d %d %lu\n", + sk_wmem_alloc_get(ax25->sk), + sk_rmem_alloc_get(ax25->sk), + sock_i_ino(ax25->sk)); + } else { + seq_puts(seq, " * * *\n"); + } + return 0; +} + +static const struct seq_operations ax25_info_seqops = { + .start = ax25_info_start, + .next = ax25_info_next, + .stop = ax25_info_stop, + .show = ax25_info_show, +}; +#endif + +static const struct net_proto_family ax25_family_ops = { + .family = PF_AX25, + .create = ax25_create, + .owner = THIS_MODULE, +}; + +static const struct proto_ops ax25_proto_ops = { + .family = PF_AX25, + .owner = THIS_MODULE, + .release = ax25_release, + .bind = ax25_bind, + .connect = ax25_connect, + .socketpair = sock_no_socketpair, + .accept = ax25_accept, + .getname = ax25_getname, + .poll = datagram_poll, + .ioctl = ax25_ioctl, + .gettstamp = sock_gettstamp, + .listen = ax25_listen, + .shutdown = ax25_shutdown, + .setsockopt = ax25_setsockopt, + .getsockopt = ax25_getsockopt, + .sendmsg = ax25_sendmsg, + .recvmsg = ax25_recvmsg, + .mmap = sock_no_mmap, + .sendpage = sock_no_sendpage, +}; + +/* + * Called by socket.c on kernel start up + */ +static struct packet_type ax25_packet_type __read_mostly = { + .type = cpu_to_be16(ETH_P_AX25), + .func = ax25_kiss_rcv, +}; + +static struct notifier_block ax25_dev_notifier = { + .notifier_call = ax25_device_event, +}; + +static int __init ax25_init(void) +{ + int rc = proto_register(&ax25_proto, 0); + + if (rc != 0) + goto out; + + sock_register(&ax25_family_ops); + dev_add_pack(&ax25_packet_type); + register_netdevice_notifier(&ax25_dev_notifier); + + proc_create_seq("ax25_route", 0444, init_net.proc_net, &ax25_rt_seqops); + proc_create_seq("ax25", 0444, init_net.proc_net, &ax25_info_seqops); + proc_create_seq("ax25_calls", 0444, init_net.proc_net, + &ax25_uid_seqops); +out: + return rc; +} +module_init(ax25_init); + + +MODULE_AUTHOR("Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>"); +MODULE_DESCRIPTION("The amateur radio AX.25 link layer protocol"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS_NETPROTO(PF_AX25); + +static void __exit ax25_exit(void) +{ + remove_proc_entry("ax25_route", init_net.proc_net); + remove_proc_entry("ax25", init_net.proc_net); + remove_proc_entry("ax25_calls", init_net.proc_net); + + unregister_netdevice_notifier(&ax25_dev_notifier); + + dev_remove_pack(&ax25_packet_type); + + sock_unregister(PF_AX25); + proto_unregister(&ax25_proto); + + ax25_rt_free(); + ax25_uid_free(); + ax25_dev_free(); +} +module_exit(ax25_exit); |