diff options
Diffstat (limited to 'net/ax25/ax25_uid.c')
| -rw-r--r-- | net/ax25/ax25_uid.c | 228 |
1 files changed, 228 insertions, 0 deletions
diff --git a/net/ax25/ax25_uid.c b/net/ax25/ax25_uid.c new file mode 100644 index 00000000000..cea6b7d1972 --- /dev/null +++ b/net/ax25/ax25_uid.c @@ -0,0 +1,228 @@ +/* + * 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/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 <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/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 ax25_uid_assoc *ax25_uid_list; +static DEFINE_RWLOCK(ax25_uid_lock); + +int ax25_uid_policy = 0; + +ax25_address *ax25_findbyuid(uid_t uid) +{ + ax25_uid_assoc *ax25_uid; + ax25_address *res = NULL; + + read_lock(&ax25_uid_lock); + for (ax25_uid = ax25_uid_list; ax25_uid != NULL; ax25_uid = ax25_uid->next) { + if (ax25_uid->uid == uid) { + res = &ax25_uid->call; + break; + } + } + read_unlock(&ax25_uid_lock); + + return NULL; +} + +int ax25_uid_ioctl(int cmd, struct sockaddr_ax25 *sax) +{ + ax25_uid_assoc *s, *ax25_uid; + unsigned long res; + + switch (cmd) { + case SIOCAX25GETUID: + res = -ENOENT; + read_lock(&ax25_uid_lock); + for (ax25_uid = ax25_uid_list; ax25_uid != NULL; ax25_uid = ax25_uid->next) { + 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; + 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; + + write_lock(&ax25_uid_lock); + ax25_uid->next = ax25_uid_list; + ax25_uid_list = ax25_uid; + write_unlock(&ax25_uid_lock); + + return 0; + + case SIOCAX25DELUID: + if (!capable(CAP_NET_ADMIN)) + return -EPERM; + + write_lock(&ax25_uid_lock); + 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) { + write_unlock(&ax25_uid_lock); + return -ENOENT; + } + if ((s = ax25_uid_list) == ax25_uid) { + ax25_uid_list = s->next; + write_unlock(&ax25_uid_lock); + kfree(ax25_uid); + return 0; + } + while (s != NULL && s->next != NULL) { + if (s->next == ax25_uid) { + s->next = ax25_uid->next; + write_unlock(&ax25_uid_lock); + kfree(ax25_uid); + return 0; + } + s = s->next; + } + write_unlock(&ax25_uid_lock); + + return -ENOENT; + + default: + return -EINVAL; + } + + return -EINVAL; /*NOTREACHED */ +} + +#ifdef CONFIG_PROC_FS + +static void *ax25_uid_seq_start(struct seq_file *seq, loff_t *pos) +{ + struct ax25_uid_assoc *pt; + int i = 1; + + read_lock(&ax25_uid_lock); + if (*pos == 0) + return SEQ_START_TOKEN; + + for (pt = ax25_uid_list; pt != NULL; pt = pt->next) { + 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 (v == SEQ_START_TOKEN) ? ax25_uid_list : + ((struct ax25_uid_assoc *) v)->next; +} + +static void ax25_uid_seq_stop(struct seq_file *seq, void *v) +{ + read_unlock(&ax25_uid_lock); +} + +static int ax25_uid_seq_show(struct seq_file *seq, void *v) +{ + 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(&pt->call)); + } + return 0; +} + +static 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); +} + +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 *s, *ax25_uid; + + write_lock(&ax25_uid_lock); + ax25_uid = ax25_uid_list; + while (ax25_uid != NULL) { + s = ax25_uid; + ax25_uid = ax25_uid->next; + + kfree(s); + } + ax25_uid_list = NULL; + write_unlock(&ax25_uid_lock); +} |