diff options
Diffstat (limited to 'net/ax25/ax25_uid.c')
| -rw-r--r-- | net/ax25/ax25_uid.c | 189 |
1 files changed, 189 insertions, 0 deletions
diff --git a/net/ax25/ax25_uid.c b/net/ax25/ax25_uid.c new file mode 100644 index 000000000..3325f5056 --- /dev/null +++ b/net/ax25/ax25_uid.c @@ -0,0 +1,189 @@ +/* + * AX.25 release 036 + * + * 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/ 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/config.h> +#if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE) +#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/firewall.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 = NULL; + +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 (!suser()) + 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 (!suser()) + 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_s(ax25_uid, sizeof(ax25_uid_assoc)); + return 0; + } + while (s != NULL && s->next != NULL) { + if (s->next == ax25_uid) { + s->next = ax25_uid->next; + restore_flags(flags); + kfree_s(ax25_uid, sizeof(ax25_uid_assoc)); + 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, int dummy) +{ + 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; +} + +#ifdef MODULE + +/* + * Free all memory associated with UID/Callsign structures. + */ +void 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(s, sizeof(ax25_uid_assoc)); + } +} + +#endif + +#endif |