/* * This program 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. * * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk) */ #include <linux/capability.h> #include <linux/errno.h> #include <linux/types.h> #include <linux/socket.h> #include <linux/in.h> #include <linux/kernel.h> #include <linux/timer.h> #include <linux/string.h> #include <linux/sockios.h> #include <linux/net.h> #include <linux/spinlock.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 <asm/uaccess.h> #include <asm/system.h> #include <linux/fcntl.h> #include <linux/mm.h> #include <linux/interrupt.h> #include <linux/list.h> #include <linux/notifier.h> #include <linux/proc_fs.h> #include <linux/seq_file.h> #include <linux/stat.h> #include <linux/netfilter.h> #include <linux/sysctl.h> #include <net/ip.h> #include <net/arp.h> /* * Callsign/UID mapper. This is in kernel space for security on multi-amateur machines. */ static HLIST_HEAD(ax25_uid_list); static DEFINE_RWLOCK(ax25_uid_lock); int ax25_uid_policy; EXPORT_SYMBOL(ax25_uid_policy); ax25_uid_assoc *ax25_findbyuid(uid_t uid) { ax25_uid_assoc *ax25_uid, *res = NULL; struct hlist_node *node; read_lock(&ax25_uid_lock); ax25_uid_for_each(ax25_uid, node, &ax25_uid_list) { if (ax25_uid->uid == uid) { ax25_uid_hold(ax25_uid); res = ax25_uid; break; } } read_unlock(&ax25_uid_lock); return res; } EXPORT_SYMBOL(ax25_findbyuid); int ax25_uid_ioctl(int cmd, struct sockaddr_ax25 *sax) { ax25_uid_assoc *ax25_uid; struct hlist_node *node; ax25_uid_assoc *user; unsigned long res; switch (cmd) { case SIOCAX25GETUID: res = -ENOENT; read_lock(&ax25_uid_lock); ax25_uid_for_each(ax25_uid, node, &ax25_uid_list) { if (ax25cmp(&sax->sax25_call, &ax25_uid->call) == 0) { res = ax25_uid->uid; break; } } read_unlock(&ax25_uid_lock); return res; case SIOCAX25ADDUID: if (!capable(CAP_NET_ADMIN)) return -EPERM; user = ax25_findbyuid(sax->sax25_uid); if (user) { ax25_uid_put(user); return -EEXIST; } if (sax->sax25_uid == 0) return -EINVAL; if ((ax25_uid = kmalloc(sizeof(*ax25_uid), GFP_KERNEL)) == NULL) return -ENOMEM; atomic_set(&ax25_uid->refcount, 1); ax25_uid->uid = sax->sax25_uid; ax25_uid->call = sax->sax25_call; write_lock(&ax25_uid_lock); hlist_add_head(&ax25_uid->uid_node, &ax25_uid_list); write_unlock(&ax25_uid_lock); return 0; case SIOCAX25DELUID: if (!capable(CAP_NET_ADMIN)) return -EPERM; ax25_uid = NULL; write_lock(&ax25_uid_lock); ax25_uid_for_each(ax25_uid, node, &ax25_uid_list) { if (ax25cmp(&sax->sax25_call, &ax25_uid->call) == 0) break; } if (ax25_uid == NULL) { write_unlock(&ax25_uid_lock); return -ENOENT; } hlist_del_init(&ax25_uid->uid_node); ax25_uid_put(ax25_uid); write_unlock(&ax25_uid_lock); return 0; default: return -EINVAL; } return -EINVAL; /*NOTREACHED */ } #ifdef CONFIG_PROC_FS static void *ax25_uid_seq_start(struct seq_file *seq, loff_t *pos) __acquires(ax25_uid_lock) { struct ax25_uid_assoc *pt; struct hlist_node *node; int i = 0; read_lock(&ax25_uid_lock); ax25_uid_for_each(pt, node, &ax25_uid_list) { if (i == *pos) return pt; ++i; } return NULL; } static void *ax25_uid_seq_next(struct seq_file *seq, void *v, loff_t *pos) { ++*pos; return hlist_entry(((ax25_uid_assoc *)v)->uid_node.next, ax25_uid_assoc, uid_node); } static void ax25_uid_seq_stop(struct seq_file *seq, void *v) __releases(ax25_uid_lock) { read_unlock(&ax25_uid_lock); } static int ax25_uid_seq_show(struct seq_file *seq, void *v) { char buf[11]; if (v == SEQ_START_TOKEN) seq_printf(seq, "Policy: %d\n", ax25_uid_policy); else { struct ax25_uid_assoc *pt = v; seq_printf(seq, "%6d %s\n", pt->uid, ax2asc(buf, &pt->call)); } return 0; } static const struct seq_operations ax25_uid_seqops = { .start = ax25_uid_seq_start, .next = ax25_uid_seq_next, .stop = ax25_uid_seq_stop, .show = ax25_uid_seq_show, }; static int ax25_uid_info_open(struct inode *inode, struct file *file) { return seq_open(file, &ax25_uid_seqops); } const struct file_operations ax25_uid_fops = { .owner = THIS_MODULE, .open = ax25_uid_info_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release, }; #endif /* * Free all memory associated with UID/Callsign structures. */ void __exit ax25_uid_free(void) { ax25_uid_assoc *ax25_uid; struct hlist_node *node; write_lock(&ax25_uid_lock); again: ax25_uid_for_each(ax25_uid, node, &ax25_uid_list) { hlist_del_init(&ax25_uid->uid_node); ax25_uid_put(ax25_uid); goto again; } write_unlock(&ax25_uid_lock); }