Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * This program is free software; you can redistribute it and/or modify |
| 3 | * it under the terms of the GNU General Public License as published by |
| 4 | * the Free Software Foundation; either version 2 of the License, or |
| 5 | * (at your option) any later version. |
| 6 | * |
| 7 | * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk) |
| 8 | */ |
Randy Dunlap | 4fc268d | 2006-01-11 12:17:47 -0800 | [diff] [blame^] | 9 | |
| 10 | #include <linux/capability.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | #include <linux/errno.h> |
| 12 | #include <linux/types.h> |
| 13 | #include <linux/socket.h> |
| 14 | #include <linux/in.h> |
| 15 | #include <linux/kernel.h> |
| 16 | #include <linux/sched.h> |
| 17 | #include <linux/timer.h> |
| 18 | #include <linux/string.h> |
| 19 | #include <linux/sockios.h> |
| 20 | #include <linux/net.h> |
| 21 | #include <linux/spinlock.h> |
| 22 | #include <net/ax25.h> |
| 23 | #include <linux/inet.h> |
| 24 | #include <linux/netdevice.h> |
| 25 | #include <linux/if_arp.h> |
| 26 | #include <linux/skbuff.h> |
| 27 | #include <net/sock.h> |
| 28 | #include <asm/uaccess.h> |
| 29 | #include <asm/system.h> |
| 30 | #include <linux/fcntl.h> |
| 31 | #include <linux/mm.h> |
| 32 | #include <linux/interrupt.h> |
Ralf Baechle | 01d7dd0 | 2005-08-23 10:11:45 -0700 | [diff] [blame] | 33 | #include <linux/list.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | #include <linux/notifier.h> |
| 35 | #include <linux/proc_fs.h> |
| 36 | #include <linux/seq_file.h> |
| 37 | #include <linux/stat.h> |
| 38 | #include <linux/netfilter.h> |
| 39 | #include <linux/sysctl.h> |
| 40 | #include <net/ip.h> |
| 41 | #include <net/arp.h> |
| 42 | |
| 43 | /* |
| 44 | * Callsign/UID mapper. This is in kernel space for security on multi-amateur machines. |
| 45 | */ |
| 46 | |
Ralf Baechle | 01d7dd0 | 2005-08-23 10:11:45 -0700 | [diff] [blame] | 47 | HLIST_HEAD(ax25_uid_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | static DEFINE_RWLOCK(ax25_uid_lock); |
| 49 | |
| 50 | int ax25_uid_policy = 0; |
| 51 | |
Ralf Baechle | 01d7dd0 | 2005-08-23 10:11:45 -0700 | [diff] [blame] | 52 | ax25_uid_assoc *ax25_findbyuid(uid_t uid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | { |
Ralf Baechle | 01d7dd0 | 2005-08-23 10:11:45 -0700 | [diff] [blame] | 54 | ax25_uid_assoc *ax25_uid, *res = NULL; |
| 55 | struct hlist_node *node; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | |
| 57 | read_lock(&ax25_uid_lock); |
Ralf Baechle | 01d7dd0 | 2005-08-23 10:11:45 -0700 | [diff] [blame] | 58 | ax25_uid_for_each(ax25_uid, node, &ax25_uid_list) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | if (ax25_uid->uid == uid) { |
Ralf Baechle | 01d7dd0 | 2005-08-23 10:11:45 -0700 | [diff] [blame] | 60 | ax25_uid_hold(ax25_uid); |
| 61 | res = ax25_uid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | break; |
| 63 | } |
| 64 | } |
| 65 | read_unlock(&ax25_uid_lock); |
| 66 | |
Ralf Baechle | 01d7dd0 | 2005-08-23 10:11:45 -0700 | [diff] [blame] | 67 | return res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | } |
| 69 | |
| 70 | int ax25_uid_ioctl(int cmd, struct sockaddr_ax25 *sax) |
| 71 | { |
Ralf Baechle | 01d7dd0 | 2005-08-23 10:11:45 -0700 | [diff] [blame] | 72 | ax25_uid_assoc *ax25_uid; |
| 73 | struct hlist_node *node; |
| 74 | ax25_uid_assoc *user; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | unsigned long res; |
| 76 | |
| 77 | switch (cmd) { |
| 78 | case SIOCAX25GETUID: |
| 79 | res = -ENOENT; |
| 80 | read_lock(&ax25_uid_lock); |
Ralf Baechle | 01d7dd0 | 2005-08-23 10:11:45 -0700 | [diff] [blame] | 81 | ax25_uid_for_each(ax25_uid, node, &ax25_uid_list) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | if (ax25cmp(&sax->sax25_call, &ax25_uid->call) == 0) { |
| 83 | res = ax25_uid->uid; |
| 84 | break; |
| 85 | } |
| 86 | } |
| 87 | read_unlock(&ax25_uid_lock); |
| 88 | |
| 89 | return res; |
| 90 | |
| 91 | case SIOCAX25ADDUID: |
| 92 | if (!capable(CAP_NET_ADMIN)) |
| 93 | return -EPERM; |
Ralf Baechle | 01d7dd0 | 2005-08-23 10:11:45 -0700 | [diff] [blame] | 94 | user = ax25_findbyuid(sax->sax25_uid); |
| 95 | if (user) { |
| 96 | ax25_uid_put(user); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | return -EEXIST; |
Ralf Baechle | 01d7dd0 | 2005-08-23 10:11:45 -0700 | [diff] [blame] | 98 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | if (sax->sax25_uid == 0) |
| 100 | return -EINVAL; |
| 101 | if ((ax25_uid = kmalloc(sizeof(*ax25_uid), GFP_KERNEL)) == NULL) |
| 102 | return -ENOMEM; |
| 103 | |
Ralf Baechle | 01d7dd0 | 2005-08-23 10:11:45 -0700 | [diff] [blame] | 104 | atomic_set(&ax25_uid->refcount, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | ax25_uid->uid = sax->sax25_uid; |
| 106 | ax25_uid->call = sax->sax25_call; |
| 107 | |
| 108 | write_lock(&ax25_uid_lock); |
Ralf Baechle | 01d7dd0 | 2005-08-23 10:11:45 -0700 | [diff] [blame] | 109 | hlist_add_head(&ax25_uid->uid_node, &ax25_uid_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | write_unlock(&ax25_uid_lock); |
| 111 | |
| 112 | return 0; |
| 113 | |
| 114 | case SIOCAX25DELUID: |
| 115 | if (!capable(CAP_NET_ADMIN)) |
| 116 | return -EPERM; |
| 117 | |
Ralf Baechle | 01d7dd0 | 2005-08-23 10:11:45 -0700 | [diff] [blame] | 118 | ax25_uid = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | write_lock(&ax25_uid_lock); |
Ralf Baechle | 01d7dd0 | 2005-08-23 10:11:45 -0700 | [diff] [blame] | 120 | ax25_uid_for_each(ax25_uid, node, &ax25_uid_list) { |
| 121 | if (ax25cmp(&sax->sax25_call, &ax25_uid->call) == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | } |
| 124 | if (ax25_uid == NULL) { |
| 125 | write_unlock(&ax25_uid_lock); |
| 126 | return -ENOENT; |
| 127 | } |
Ralf Baechle | 01d7dd0 | 2005-08-23 10:11:45 -0700 | [diff] [blame] | 128 | hlist_del_init(&ax25_uid->uid_node); |
| 129 | ax25_uid_put(ax25_uid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | write_unlock(&ax25_uid_lock); |
| 131 | |
Ralf Baechle | 01d7dd0 | 2005-08-23 10:11:45 -0700 | [diff] [blame] | 132 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | |
| 134 | default: |
| 135 | return -EINVAL; |
| 136 | } |
| 137 | |
| 138 | return -EINVAL; /*NOTREACHED */ |
| 139 | } |
| 140 | |
| 141 | #ifdef CONFIG_PROC_FS |
| 142 | |
| 143 | static void *ax25_uid_seq_start(struct seq_file *seq, loff_t *pos) |
| 144 | { |
| 145 | struct ax25_uid_assoc *pt; |
Ralf Baechle | 01d7dd0 | 2005-08-23 10:11:45 -0700 | [diff] [blame] | 146 | struct hlist_node *node; |
| 147 | int i = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | |
| 149 | read_lock(&ax25_uid_lock); |
Ralf Baechle | 01d7dd0 | 2005-08-23 10:11:45 -0700 | [diff] [blame] | 150 | ax25_uid_for_each(pt, node, &ax25_uid_list) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | if (i == *pos) |
| 152 | return pt; |
| 153 | ++i; |
| 154 | } |
| 155 | return NULL; |
| 156 | } |
| 157 | |
| 158 | static void *ax25_uid_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 159 | { |
| 160 | ++*pos; |
Ralf Baechle | 01d7dd0 | 2005-08-23 10:11:45 -0700 | [diff] [blame] | 161 | |
| 162 | return hlist_entry(((ax25_uid_assoc *)v)->uid_node.next, |
| 163 | ax25_uid_assoc, uid_node); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | } |
| 165 | |
| 166 | static void ax25_uid_seq_stop(struct seq_file *seq, void *v) |
| 167 | { |
| 168 | read_unlock(&ax25_uid_lock); |
| 169 | } |
| 170 | |
| 171 | static int ax25_uid_seq_show(struct seq_file *seq, void *v) |
| 172 | { |
Ralf Baechle | f75268c | 2005-09-06 15:49:39 -0700 | [diff] [blame] | 173 | char buf[11]; |
| 174 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | if (v == SEQ_START_TOKEN) |
| 176 | seq_printf(seq, "Policy: %d\n", ax25_uid_policy); |
| 177 | else { |
| 178 | struct ax25_uid_assoc *pt = v; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | |
Ralf Baechle | f75268c | 2005-09-06 15:49:39 -0700 | [diff] [blame] | 180 | seq_printf(seq, "%6d %s\n", pt->uid, ax2asc(buf, &pt->call)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | } |
| 182 | return 0; |
| 183 | } |
| 184 | |
| 185 | static struct seq_operations ax25_uid_seqops = { |
| 186 | .start = ax25_uid_seq_start, |
| 187 | .next = ax25_uid_seq_next, |
| 188 | .stop = ax25_uid_seq_stop, |
| 189 | .show = ax25_uid_seq_show, |
| 190 | }; |
| 191 | |
| 192 | static int ax25_uid_info_open(struct inode *inode, struct file *file) |
| 193 | { |
| 194 | return seq_open(file, &ax25_uid_seqops); |
| 195 | } |
| 196 | |
| 197 | struct file_operations ax25_uid_fops = { |
| 198 | .owner = THIS_MODULE, |
| 199 | .open = ax25_uid_info_open, |
| 200 | .read = seq_read, |
| 201 | .llseek = seq_lseek, |
| 202 | .release = seq_release, |
| 203 | }; |
| 204 | |
| 205 | #endif |
| 206 | |
| 207 | /* |
| 208 | * Free all memory associated with UID/Callsign structures. |
| 209 | */ |
| 210 | void __exit ax25_uid_free(void) |
| 211 | { |
Ralf Baechle | 01d7dd0 | 2005-08-23 10:11:45 -0700 | [diff] [blame] | 212 | ax25_uid_assoc *ax25_uid; |
| 213 | struct hlist_node *node; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | |
| 215 | write_lock(&ax25_uid_lock); |
Ralf Baechle | 01d7dd0 | 2005-08-23 10:11:45 -0700 | [diff] [blame] | 216 | ax25_uid_for_each(ax25_uid, node, &ax25_uid_list) { |
| 217 | hlist_del_init(&ax25_uid->uid_node); |
| 218 | ax25_uid_put(ax25_uid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | write_unlock(&ax25_uid_lock); |
| 221 | } |