2005-04-16 22:20:36 +00:00
|
|
|
/*
|
|
|
|
* DECnet An implementation of the DECnet protocol suite for the LINUX
|
|
|
|
* operating system. DECnet is implemented using the BSD Socket
|
|
|
|
* interface as the means of communication with the user level.
|
|
|
|
*
|
|
|
|
* DECnet Routing Message Grabulator
|
|
|
|
*
|
|
|
|
* (C) 2000 ChyGwyn Limited - http://www.chygwyn.com/
|
|
|
|
* This code may be copied under the GPL v.2 or at your option
|
|
|
|
* any later version.
|
|
|
|
*
|
|
|
|
* Author: Steven Whitehouse <steve@chygwyn.com>
|
|
|
|
*
|
|
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
|
|
#include <linux/skbuff.h>
|
|
|
|
#include <linux/init.h>
|
|
|
|
#include <linux/netdevice.h>
|
|
|
|
#include <linux/netfilter.h>
|
|
|
|
#include <linux/spinlock.h>
|
|
|
|
#include <linux/netlink.h>
|
2005-08-16 03:35:44 +00:00
|
|
|
#include <linux/netfilter_decnet.h>
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
#include <net/sock.h>
|
|
|
|
#include <net/flow.h>
|
|
|
|
#include <net/dn.h>
|
|
|
|
#include <net/dn_route.h>
|
|
|
|
|
|
|
|
static struct sock *dnrmg = NULL;
|
|
|
|
|
|
|
|
|
|
|
|
static struct sk_buff *dnrmg_build_message(struct sk_buff *rt_skb, int *errp)
|
|
|
|
{
|
|
|
|
struct sk_buff *skb = NULL;
|
|
|
|
size_t size;
|
2007-04-20 03:29:13 +00:00
|
|
|
sk_buff_data_t old_tail;
|
2005-04-16 22:20:36 +00:00
|
|
|
struct nlmsghdr *nlh;
|
|
|
|
unsigned char *ptr;
|
|
|
|
struct nf_dn_rtmsg *rtm;
|
|
|
|
|
|
|
|
size = NLMSG_SPACE(rt_skb->len);
|
|
|
|
size += NLMSG_ALIGN(sizeof(struct nf_dn_rtmsg));
|
|
|
|
skb = alloc_skb(size, GFP_ATOMIC);
|
|
|
|
if (!skb)
|
|
|
|
goto nlmsg_failure;
|
|
|
|
old_tail = skb->tail;
|
|
|
|
nlh = NLMSG_PUT(skb, 0, 0, 0, size - sizeof(*nlh));
|
|
|
|
rtm = (struct nf_dn_rtmsg *)NLMSG_DATA(nlh);
|
|
|
|
rtm->nfdn_ifindex = rt_skb->dev->ifindex;
|
|
|
|
ptr = NFDN_RTMSG(rtm);
|
2007-03-31 14:55:45 +00:00
|
|
|
skb_copy_from_linear_data(rt_skb, ptr, rt_skb->len);
|
2005-04-16 22:20:36 +00:00
|
|
|
nlh->nlmsg_len = skb->tail - old_tail;
|
|
|
|
return skb;
|
|
|
|
|
|
|
|
nlmsg_failure:
|
|
|
|
if (skb)
|
|
|
|
kfree_skb(skb);
|
|
|
|
*errp = -ENOMEM;
|
|
|
|
if (net_ratelimit())
|
|
|
|
printk(KERN_ERR "dn_rtmsg: error creating netlink message\n");
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void dnrmg_send_peer(struct sk_buff *skb)
|
|
|
|
{
|
|
|
|
struct sk_buff *skb2;
|
|
|
|
int status = 0;
|
|
|
|
int group = 0;
|
|
|
|
unsigned char flags = *skb->data;
|
|
|
|
|
|
|
|
switch(flags & DN_RT_CNTL_MSK) {
|
|
|
|
case DN_RT_PKT_L1RT:
|
2005-08-16 03:35:44 +00:00
|
|
|
group = DNRNG_NLGRP_L1;
|
2005-04-16 22:20:36 +00:00
|
|
|
break;
|
|
|
|
case DN_RT_PKT_L2RT:
|
2005-08-16 03:35:44 +00:00
|
|
|
group = DNRNG_NLGRP_L2;
|
2005-04-16 22:20:36 +00:00
|
|
|
break;
|
|
|
|
default:
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
skb2 = dnrmg_build_message(skb, &status);
|
|
|
|
if (skb2 == NULL)
|
|
|
|
return;
|
2005-08-15 02:29:52 +00:00
|
|
|
NETLINK_CB(skb2).dst_group = group;
|
2005-04-16 22:20:36 +00:00
|
|
|
netlink_broadcast(dnrmg, skb2, 0, group, GFP_ATOMIC);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static unsigned int dnrmg_hook(unsigned int hook,
|
|
|
|
struct sk_buff **pskb,
|
|
|
|
const struct net_device *in,
|
|
|
|
const struct net_device *out,
|
|
|
|
int (*okfn)(struct sk_buff *))
|
|
|
|
{
|
|
|
|
dnrmg_send_peer(*pskb);
|
|
|
|
return NF_ACCEPT;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
#define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0)
|
|
|
|
|
|
|
|
static inline void dnrmg_receive_user_skb(struct sk_buff *skb)
|
|
|
|
{
|
2007-04-26 02:08:35 +00:00
|
|
|
struct nlmsghdr *nlh = nlmsg_hdr(skb);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
if (nlh->nlmsg_len < sizeof(*nlh) || skb->len < nlh->nlmsg_len)
|
|
|
|
return;
|
|
|
|
|
2006-06-27 20:26:11 +00:00
|
|
|
if (security_netlink_recv(skb, CAP_NET_ADMIN))
|
2005-04-16 22:20:36 +00:00
|
|
|
RCV_SKB_FAIL(-EPERM);
|
|
|
|
|
|
|
|
/* Eventually we might send routing messages too */
|
|
|
|
|
|
|
|
RCV_SKB_FAIL(-EINVAL);
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct nf_hook_ops dnrmg_ops = {
|
|
|
|
.hook = dnrmg_hook,
|
|
|
|
.pf = PF_DECnet,
|
|
|
|
.hooknum = NF_DN_ROUTE,
|
|
|
|
.priority = NF_DN_PRI_DNRTMSG,
|
|
|
|
};
|
|
|
|
|
2006-03-29 00:37:06 +00:00
|
|
|
static int __init dn_rtmsg_init(void)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
int rv = 0;
|
|
|
|
|
2007-09-12 11:05:38 +00:00
|
|
|
dnrmg = netlink_kernel_create(&init_net,
|
|
|
|
NETLINK_DNRTMSG, DNRNG_NLGRP_MAX,
|
2007-10-11 04:15:29 +00:00
|
|
|
dnrmg_receive_user_skb,
|
|
|
|
NULL, THIS_MODULE);
|
2005-04-16 22:20:36 +00:00
|
|
|
if (dnrmg == NULL) {
|
|
|
|
printk(KERN_ERR "dn_rtmsg: Cannot create netlink socket");
|
|
|
|
return -ENOMEM;
|
|
|
|
}
|
|
|
|
|
|
|
|
rv = nf_register_hook(&dnrmg_ops);
|
|
|
|
if (rv) {
|
|
|
|
sock_release(dnrmg->sk_socket);
|
|
|
|
}
|
|
|
|
|
|
|
|
return rv;
|
|
|
|
}
|
|
|
|
|
2006-03-29 00:37:06 +00:00
|
|
|
static void __exit dn_rtmsg_fini(void)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
nf_unregister_hook(&dnrmg_ops);
|
|
|
|
sock_release(dnrmg->sk_socket);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
MODULE_DESCRIPTION("DECnet Routing Message Grabulator");
|
|
|
|
MODULE_AUTHOR("Steven Whitehouse <steve@chygwyn.com>");
|
|
|
|
MODULE_LICENSE("GPL");
|
2005-08-10 02:40:55 +00:00
|
|
|
MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_DNRTMSG);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2006-03-29 00:37:06 +00:00
|
|
|
module_init(dn_rtmsg_init);
|
|
|
|
module_exit(dn_rtmsg_fini);
|
2005-04-16 22:20:36 +00:00
|
|
|
|