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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 | /* * AX.25 release 037 * * This code REQUIRES 2.1.15 or higher/ NET3.038 * * 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 * AX.25 036 Jonathan(G4KLX) Split from af_ax25.c. */ #include <linux/errno.h> #include <linux/types.h> #include <linux/socket.h> #include <linux/in.h> #include <linux/kernel.h> #include <linux/sched.h> #include <linux/timer.h> #include <linux/string.h> #include <linux/sockios.h> #include <linux/net.h> #include <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/notifier.h> #include <linux/proc_fs.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 ax25_uid_assoc *ax25_uid_list; int ax25_uid_policy = 0; ax25_address *ax25_findbyuid(uid_t uid) { ax25_uid_assoc *ax25_uid; for (ax25_uid = ax25_uid_list; ax25_uid != NULL; ax25_uid = ax25_uid->next) { if (ax25_uid->uid == uid) return &ax25_uid->call; } return NULL; } int ax25_uid_ioctl(int cmd, struct sockaddr_ax25 *sax) { ax25_uid_assoc *s, *ax25_uid; unsigned long flags; switch (cmd) { case SIOCAX25GETUID: for (ax25_uid = ax25_uid_list; ax25_uid != NULL; ax25_uid = ax25_uid->next) { if (ax25cmp(&sax->sax25_call, &ax25_uid->call) == 0) return ax25_uid->uid; } return -ENOENT; case SIOCAX25ADDUID: if (!capable(CAP_NET_ADMIN)) return -EPERM; if (ax25_findbyuid(sax->sax25_uid)) return -EEXIST; if (sax->sax25_uid == 0) return -EINVAL; if ((ax25_uid = kmalloc(sizeof(*ax25_uid), GFP_KERNEL)) == NULL) return -ENOMEM; ax25_uid->uid = sax->sax25_uid; ax25_uid->call = sax->sax25_call; save_flags(flags); cli(); ax25_uid->next = ax25_uid_list; ax25_uid_list = ax25_uid; restore_flags(flags); return 0; case SIOCAX25DELUID: if (!capable(CAP_NET_ADMIN)) return -EPERM; for (ax25_uid = ax25_uid_list; ax25_uid != NULL; ax25_uid = ax25_uid->next) { if (ax25cmp(&sax->sax25_call, &ax25_uid->call) == 0) break; } if (ax25_uid == NULL) return -ENOENT; save_flags(flags); cli(); if ((s = ax25_uid_list) == ax25_uid) { ax25_uid_list = s->next; restore_flags(flags); kfree(ax25_uid); return 0; } while (s != NULL && s->next != NULL) { if (s->next == ax25_uid) { s->next = ax25_uid->next; restore_flags(flags); kfree(ax25_uid); return 0; } s = s->next; } restore_flags(flags); return -ENOENT; default: return -EINVAL; } return -EINVAL; /*NOTREACHED */ } int ax25_uid_get_info(char *buffer, char **start, off_t offset, int length) { ax25_uid_assoc *pt; int len = 0; off_t pos = 0; off_t begin = 0; cli(); len += sprintf(buffer, "Policy: %d\n", ax25_uid_policy); for (pt = ax25_uid_list; pt != NULL; pt = pt->next) { len += sprintf(buffer + len, "%6d %s\n", pt->uid, ax2asc(&pt->call)); pos = begin + len; if (pos < offset) { len = 0; begin = pos; } if (pos > offset + length) break; } sti(); *start = buffer + (offset - begin); len -= offset - begin; if (len > length) len = length; return len; } /* * Free all memory associated with UID/Callsign structures. */ void __exit ax25_uid_free(void) { ax25_uid_assoc *s, *ax25_uid = ax25_uid_list; while (ax25_uid != NULL) { s = ax25_uid; ax25_uid = ax25_uid->next; kfree(s); } } |