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linux-next/net/ax25/ax25_route.c
Arjan van de Ven 9a32144e9d [PATCH] mark struct file_operations const 7
Many struct file_operations in the kernel can be "const".  Marking them const
moves these to the .rodata section, which avoids false sharing with potential
dirty data.  In addition it'll catch accidental writes at compile time to
these shared resources.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-12 09:48:46 -08:00

503 lines
11 KiB
C

/*
* 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) Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk)
* Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
* Copyright (C) Steven Whitehouse GW7RRM (stevew@acm.org)
* Copyright (C) Joerg Reuter DL1BKE (jreuter@yaina.de)
* Copyright (C) Hans-Joachim Hetscher DD8NE (dd8ne@bnv-bamberg.de)
* Copyright (C) Frederic Rible F1OAT (frible@teaser.fr)
*/
#include <linux/capability.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/timer.h>
#include <linux/in.h>
#include <linux/kernel.h>
#include <linux/sched.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 <linux/spinlock.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/init.h>
#include <linux/seq_file.h>
static ax25_route *ax25_route_list;
static DEFINE_RWLOCK(ax25_route_lock);
void ax25_rt_device_down(struct net_device *dev)
{
ax25_route *s, *t, *ax25_rt;
write_lock(&ax25_route_lock);
ax25_rt = ax25_route_list;
while (ax25_rt != NULL) {
s = ax25_rt;
ax25_rt = ax25_rt->next;
if (s->dev == dev) {
if (ax25_route_list == s) {
ax25_route_list = s->next;
kfree(s->digipeat);
kfree(s);
} else {
for (t = ax25_route_list; t != NULL; t = t->next) {
if (t->next == s) {
t->next = s->next;
kfree(s->digipeat);
kfree(s);
break;
}
}
}
}
}
write_unlock(&ax25_route_lock);
}
static int __must_check ax25_rt_add(struct ax25_routes_struct *route)
{
ax25_route *ax25_rt;
ax25_dev *ax25_dev;
int i;
if ((ax25_dev = ax25_addr_ax25dev(&route->port_addr)) == NULL)
return -EINVAL;
if (route->digi_count > AX25_MAX_DIGIS)
return -EINVAL;
write_lock(&ax25_route_lock);
ax25_rt = ax25_route_list;
while (ax25_rt != NULL) {
if (ax25cmp(&ax25_rt->callsign, &route->dest_addr) == 0 &&
ax25_rt->dev == ax25_dev->dev) {
kfree(ax25_rt->digipeat);
ax25_rt->digipeat = NULL;
if (route->digi_count != 0) {
if ((ax25_rt->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) {
write_unlock(&ax25_route_lock);
return -ENOMEM;
}
ax25_rt->digipeat->lastrepeat = -1;
ax25_rt->digipeat->ndigi = route->digi_count;
for (i = 0; i < route->digi_count; i++) {
ax25_rt->digipeat->repeated[i] = 0;
ax25_rt->digipeat->calls[i] = route->digi_addr[i];
}
}
write_unlock(&ax25_route_lock);
return 0;
}
ax25_rt = ax25_rt->next;
}
if ((ax25_rt = kmalloc(sizeof(ax25_route), GFP_ATOMIC)) == NULL) {
write_unlock(&ax25_route_lock);
return -ENOMEM;
}
atomic_set(&ax25_rt->refcount, 1);
ax25_rt->callsign = route->dest_addr;
ax25_rt->dev = ax25_dev->dev;
ax25_rt->digipeat = NULL;
ax25_rt->ip_mode = ' ';
if (route->digi_count != 0) {
if ((ax25_rt->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) {
write_unlock(&ax25_route_lock);
kfree(ax25_rt);
return -ENOMEM;
}
ax25_rt->digipeat->lastrepeat = -1;
ax25_rt->digipeat->ndigi = route->digi_count;
for (i = 0; i < route->digi_count; i++) {
ax25_rt->digipeat->repeated[i] = 0;
ax25_rt->digipeat->calls[i] = route->digi_addr[i];
}
}
ax25_rt->next = ax25_route_list;
ax25_route_list = ax25_rt;
write_unlock(&ax25_route_lock);
return 0;
}
void __ax25_put_route(ax25_route *ax25_rt)
{
kfree(ax25_rt->digipeat);
kfree(ax25_rt);
}
static int ax25_rt_del(struct ax25_routes_struct *route)
{
ax25_route *s, *t, *ax25_rt;
ax25_dev *ax25_dev;
if ((ax25_dev = ax25_addr_ax25dev(&route->port_addr)) == NULL)
return -EINVAL;
write_lock(&ax25_route_lock);
ax25_rt = ax25_route_list;
while (ax25_rt != NULL) {
s = ax25_rt;
ax25_rt = ax25_rt->next;
if (s->dev == ax25_dev->dev &&
ax25cmp(&route->dest_addr, &s->callsign) == 0) {
if (ax25_route_list == s) {
ax25_route_list = s->next;
ax25_put_route(s);
} else {
for (t = ax25_route_list; t != NULL; t = t->next) {
if (t->next == s) {
t->next = s->next;
ax25_put_route(s);
break;
}
}
}
}
}
write_unlock(&ax25_route_lock);
return 0;
}
static int ax25_rt_opt(struct ax25_route_opt_struct *rt_option)
{
ax25_route *ax25_rt;
ax25_dev *ax25_dev;
int err = 0;
if ((ax25_dev = ax25_addr_ax25dev(&rt_option->port_addr)) == NULL)
return -EINVAL;
write_lock(&ax25_route_lock);
ax25_rt = ax25_route_list;
while (ax25_rt != NULL) {
if (ax25_rt->dev == ax25_dev->dev &&
ax25cmp(&rt_option->dest_addr, &ax25_rt->callsign) == 0) {
switch (rt_option->cmd) {
case AX25_SET_RT_IPMODE:
switch (rt_option->arg) {
case ' ':
case 'D':
case 'V':
ax25_rt->ip_mode = rt_option->arg;
break;
default:
err = -EINVAL;
goto out;
}
break;
default:
err = -EINVAL;
goto out;
}
}
ax25_rt = ax25_rt->next;
}
out:
write_unlock(&ax25_route_lock);
return err;
}
int ax25_rt_ioctl(unsigned int cmd, void __user *arg)
{
struct ax25_route_opt_struct rt_option;
struct ax25_routes_struct route;
switch (cmd) {
case SIOCADDRT:
if (copy_from_user(&route, arg, sizeof(route)))
return -EFAULT;
return ax25_rt_add(&route);
case SIOCDELRT:
if (copy_from_user(&route, arg, sizeof(route)))
return -EFAULT;
return ax25_rt_del(&route);
case SIOCAX25OPTRT:
if (copy_from_user(&rt_option, arg, sizeof(rt_option)))
return -EFAULT;
return ax25_rt_opt(&rt_option);
default:
return -EINVAL;
}
}
#ifdef CONFIG_PROC_FS
static void *ax25_rt_seq_start(struct seq_file *seq, loff_t *pos)
{
struct ax25_route *ax25_rt;
int i = 1;
read_lock(&ax25_route_lock);
if (*pos == 0)
return SEQ_START_TOKEN;
for (ax25_rt = ax25_route_list; ax25_rt != NULL; ax25_rt = ax25_rt->next) {
if (i == *pos)
return ax25_rt;
++i;
}
return NULL;
}
static void *ax25_rt_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
++*pos;
return (v == SEQ_START_TOKEN) ? ax25_route_list :
((struct ax25_route *) v)->next;
}
static void ax25_rt_seq_stop(struct seq_file *seq, void *v)
{
read_unlock(&ax25_route_lock);
}
static int ax25_rt_seq_show(struct seq_file *seq, void *v)
{
char buf[11];
if (v == SEQ_START_TOKEN)
seq_puts(seq, "callsign dev mode digipeaters\n");
else {
struct ax25_route *ax25_rt = v;
const char *callsign;
int i;
if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0)
callsign = "default";
else
callsign = ax2asc(buf, &ax25_rt->callsign);
seq_printf(seq, "%-9s %-4s",
callsign,
ax25_rt->dev ? ax25_rt->dev->name : "???");
switch (ax25_rt->ip_mode) {
case 'V':
seq_puts(seq, " vc");
break;
case 'D':
seq_puts(seq, " dg");
break;
default:
seq_puts(seq, " *");
break;
}
if (ax25_rt->digipeat != NULL)
for (i = 0; i < ax25_rt->digipeat->ndigi; i++)
seq_printf(seq, " %s",
ax2asc(buf, &ax25_rt->digipeat->calls[i]));
seq_puts(seq, "\n");
}
return 0;
}
static struct seq_operations ax25_rt_seqops = {
.start = ax25_rt_seq_start,
.next = ax25_rt_seq_next,
.stop = ax25_rt_seq_stop,
.show = ax25_rt_seq_show,
};
static int ax25_rt_info_open(struct inode *inode, struct file *file)
{
return seq_open(file, &ax25_rt_seqops);
}
const struct file_operations ax25_route_fops = {
.owner = THIS_MODULE,
.open = ax25_rt_info_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release,
};
#endif
/*
* Find AX.25 route
*
* Only routes with a reference count of zero can be destroyed.
*/
ax25_route *ax25_get_route(ax25_address *addr, struct net_device *dev)
{
ax25_route *ax25_spe_rt = NULL;
ax25_route *ax25_def_rt = NULL;
ax25_route *ax25_rt;
read_lock(&ax25_route_lock);
/*
* Bind to the physical interface we heard them on, or the default
* route if none is found;
*/
for (ax25_rt = ax25_route_list; ax25_rt != NULL; ax25_rt = ax25_rt->next) {
if (dev == NULL) {
if (ax25cmp(&ax25_rt->callsign, addr) == 0 && ax25_rt->dev != NULL)
ax25_spe_rt = ax25_rt;
if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0 && ax25_rt->dev != NULL)
ax25_def_rt = ax25_rt;
} else {
if (ax25cmp(&ax25_rt->callsign, addr) == 0 && ax25_rt->dev == dev)
ax25_spe_rt = ax25_rt;
if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0 && ax25_rt->dev == dev)
ax25_def_rt = ax25_rt;
}
}
ax25_rt = ax25_def_rt;
if (ax25_spe_rt != NULL)
ax25_rt = ax25_spe_rt;
if (ax25_rt != NULL)
ax25_hold_route(ax25_rt);
read_unlock(&ax25_route_lock);
return ax25_rt;
}
/*
* Adjust path: If you specify a default route and want to connect
* a target on the digipeater path but w/o having a special route
* set before, the path has to be truncated from your target on.
*/
static inline void ax25_adjust_path(ax25_address *addr, ax25_digi *digipeat)
{
int k;
for (k = 0; k < digipeat->ndigi; k++) {
if (ax25cmp(addr, &digipeat->calls[k]) == 0)
break;
}
digipeat->ndigi = k;
}
/*
* Find which interface to use.
*/
int ax25_rt_autobind(ax25_cb *ax25, ax25_address *addr)
{
ax25_uid_assoc *user;
ax25_route *ax25_rt;
int err;
if ((ax25_rt = ax25_get_route(addr, NULL)) == NULL)
return -EHOSTUNREACH;
if ((ax25->ax25_dev = ax25_dev_ax25dev(ax25_rt->dev)) == NULL) {
err = -EHOSTUNREACH;
goto put;
}
user = ax25_findbyuid(current->euid);
if (user) {
ax25->source_addr = user->call;
ax25_uid_put(user);
} else {
if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) {
err = -EPERM;
goto put;
}
ax25->source_addr = *(ax25_address *)ax25->ax25_dev->dev->dev_addr;
}
if (ax25_rt->digipeat != NULL) {
ax25->digipeat = kmemdup(ax25_rt->digipeat, sizeof(ax25_digi),
GFP_ATOMIC);
if (ax25->digipeat == NULL) {
err = -ENOMEM;
goto put;
}
ax25_adjust_path(addr, ax25->digipeat);
}
if (ax25->sk != NULL) {
bh_lock_sock(ax25->sk);
sock_reset_flag(ax25->sk, SOCK_ZAPPED);
bh_unlock_sock(ax25->sk);
}
put:
ax25_put_route(ax25_rt);
return 0;
}
struct sk_buff *ax25_rt_build_path(struct sk_buff *skb, ax25_address *src,
ax25_address *dest, ax25_digi *digi)
{
struct sk_buff *skbn;
unsigned char *bp;
int len;
len = digi->ndigi * AX25_ADDR_LEN;
if (skb_headroom(skb) < len) {
if ((skbn = skb_realloc_headroom(skb, len)) == NULL) {
printk(KERN_CRIT "AX.25: ax25_dg_build_path - out of memory\n");
return NULL;
}
if (skb->sk != NULL)
skb_set_owner_w(skbn, skb->sk);
kfree_skb(skb);
skb = skbn;
}
bp = skb_push(skb, len);
ax25_addr_build(bp, src, dest, digi, AX25_COMMAND, AX25_MODULUS);
return skb;
}
/*
* Free all memory associated with routing structures.
*/
void __exit ax25_rt_free(void)
{
ax25_route *s, *ax25_rt = ax25_route_list;
write_lock(&ax25_route_lock);
while (ax25_rt != NULL) {
s = ax25_rt;
ax25_rt = ax25_rt->next;
kfree(s->digipeat);
kfree(s);
}
write_unlock(&ax25_route_lock);
}