Phonet: PF_PHONET protocol family support
This is the basis for the Phonet protocol families, and introduces the ETH_P_PHONET packet type and the PF_PHONET socket family. Signed-off-by: Remi Denis-Courmont <remi.denis-courmont@nokia.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
parent
bce7b15426
commit
4b07b3f69a
2 changed files with 290 additions and 0 deletions
74
include/net/phonet/phonet.h
Normal file
74
include/net/phonet/phonet.h
Normal file
|
@ -0,0 +1,74 @@
|
|||
/*
|
||||
* File: af_phonet.h
|
||||
*
|
||||
* Phonet sockets kernel definitions
|
||||
*
|
||||
* Copyright (C) 2008 Nokia Corporation.
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or
|
||||
* modify it under the terms of the GNU General Public License
|
||||
* version 2 as published by the Free Software Foundation.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful, but
|
||||
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
* General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with this program; if not, write to the Free Software
|
||||
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
|
||||
* 02110-1301 USA
|
||||
*/
|
||||
|
||||
#ifndef AF_PHONET_H
|
||||
#define AF_PHONET_H
|
||||
|
||||
/*
|
||||
* The lower layers may not require more space, ever. Make sure it's
|
||||
* enough.
|
||||
*/
|
||||
#define MAX_PHONET_HEADER 8
|
||||
|
||||
static inline struct phonethdr *pn_hdr(struct sk_buff *skb)
|
||||
{
|
||||
return (struct phonethdr *)skb_network_header(skb);
|
||||
}
|
||||
|
||||
/*
|
||||
* Get the other party's sockaddr from received skb. The skb begins
|
||||
* with a Phonet header.
|
||||
*/
|
||||
static inline
|
||||
void pn_skb_get_src_sockaddr(struct sk_buff *skb, struct sockaddr_pn *sa)
|
||||
{
|
||||
struct phonethdr *ph = pn_hdr(skb);
|
||||
u16 obj = pn_object(ph->pn_sdev, ph->pn_sobj);
|
||||
|
||||
sa->spn_family = AF_PHONET;
|
||||
pn_sockaddr_set_object(sa, obj);
|
||||
pn_sockaddr_set_resource(sa, ph->pn_res);
|
||||
memset(sa->spn_zero, 0, sizeof(sa->spn_zero));
|
||||
}
|
||||
|
||||
static inline
|
||||
void pn_skb_get_dst_sockaddr(struct sk_buff *skb, struct sockaddr_pn *sa)
|
||||
{
|
||||
struct phonethdr *ph = pn_hdr(skb);
|
||||
u16 obj = pn_object(ph->pn_rdev, ph->pn_robj);
|
||||
|
||||
sa->spn_family = AF_PHONET;
|
||||
pn_sockaddr_set_object(sa, obj);
|
||||
pn_sockaddr_set_resource(sa, ph->pn_res);
|
||||
memset(sa->spn_zero, 0, sizeof(sa->spn_zero));
|
||||
}
|
||||
|
||||
/* Protocols in Phonet protocol family. */
|
||||
struct phonet_protocol {
|
||||
struct proto *prot;
|
||||
int sock_type;
|
||||
};
|
||||
|
||||
int phonet_proto_register(int protocol, struct phonet_protocol *pp);
|
||||
void phonet_proto_unregister(int protocol, struct phonet_protocol *pp);
|
||||
|
||||
#endif
|
216
net/phonet/af_phonet.c
Normal file
216
net/phonet/af_phonet.c
Normal file
|
@ -0,0 +1,216 @@
|
|||
/*
|
||||
* File: af_phonet.c
|
||||
*
|
||||
* Phonet protocols family
|
||||
*
|
||||
* Copyright (C) 2008 Nokia Corporation.
|
||||
*
|
||||
* Contact: Remi Denis-Courmont <remi.denis-courmont@nokia.com>
|
||||
* Original author: Sakari Ailus <sakari.ailus@nokia.com>
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or
|
||||
* modify it under the terms of the GNU General Public License
|
||||
* version 2 as published by the Free Software Foundation.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful, but
|
||||
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
* General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with this program; if not, write to the Free Software
|
||||
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
|
||||
* 02110-1301 USA
|
||||
*/
|
||||
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/module.h>
|
||||
#include <asm/unaligned.h>
|
||||
#include <net/sock.h>
|
||||
|
||||
#include <linux/if_phonet.h>
|
||||
#include <linux/phonet.h>
|
||||
#include <net/phonet/phonet.h>
|
||||
|
||||
static struct net_proto_family phonet_proto_family;
|
||||
static struct phonet_protocol *phonet_proto_get(int protocol);
|
||||
static inline void phonet_proto_put(struct phonet_protocol *pp);
|
||||
|
||||
/* protocol family functions */
|
||||
|
||||
static int pn_socket_create(struct net *net, struct socket *sock, int protocol)
|
||||
{
|
||||
struct phonet_protocol *pnp;
|
||||
int err;
|
||||
|
||||
if (net != &init_net)
|
||||
return -EAFNOSUPPORT;
|
||||
|
||||
if (!capable(CAP_SYS_ADMIN))
|
||||
return -EPERM;
|
||||
|
||||
if (protocol == 0) {
|
||||
/* Default protocol selection */
|
||||
switch (sock->type) {
|
||||
case SOCK_DGRAM:
|
||||
protocol = PN_PROTO_PHONET;
|
||||
break;
|
||||
default:
|
||||
return -EPROTONOSUPPORT;
|
||||
}
|
||||
}
|
||||
|
||||
pnp = phonet_proto_get(protocol);
|
||||
if (pnp == NULL)
|
||||
return -EPROTONOSUPPORT;
|
||||
if (sock->type != pnp->sock_type) {
|
||||
err = -EPROTONOSUPPORT;
|
||||
goto out;
|
||||
}
|
||||
|
||||
/* TODO: create and init the struct sock */
|
||||
err = -EPROTONOSUPPORT;
|
||||
|
||||
out:
|
||||
phonet_proto_put(pnp);
|
||||
return err;
|
||||
}
|
||||
|
||||
static struct net_proto_family phonet_proto_family = {
|
||||
.family = AF_PHONET,
|
||||
.create = pn_socket_create,
|
||||
.owner = THIS_MODULE,
|
||||
};
|
||||
|
||||
/* packet type functions */
|
||||
|
||||
/*
|
||||
* Stuff received packets to associated sockets.
|
||||
* On error, returns non-zero and releases the skb.
|
||||
*/
|
||||
static int phonet_rcv(struct sk_buff *skb, struct net_device *dev,
|
||||
struct packet_type *pkttype,
|
||||
struct net_device *orig_dev)
|
||||
{
|
||||
struct phonethdr *ph;
|
||||
struct sockaddr_pn sa;
|
||||
u16 len;
|
||||
|
||||
if (dev_net(dev) != &init_net)
|
||||
goto out;
|
||||
|
||||
/* check we have at least a full Phonet header */
|
||||
if (!pskb_pull(skb, sizeof(struct phonethdr)))
|
||||
goto out;
|
||||
|
||||
/* check that the advertised length is correct */
|
||||
ph = pn_hdr(skb);
|
||||
len = get_unaligned_be16(&ph->pn_length);
|
||||
if (len < 2)
|
||||
goto out;
|
||||
len -= 2;
|
||||
if ((len > skb->len) || pskb_trim(skb, len))
|
||||
goto out;
|
||||
skb_reset_transport_header(skb);
|
||||
|
||||
pn_skb_get_dst_sockaddr(skb, &sa);
|
||||
if (pn_sockaddr_get_addr(&sa) == 0)
|
||||
goto out; /* currently, we cannot be device 0 */
|
||||
|
||||
/* TODO: put packets to sockets backlog */
|
||||
|
||||
out:
|
||||
kfree_skb(skb);
|
||||
return NET_RX_DROP;
|
||||
}
|
||||
|
||||
static struct packet_type phonet_packet_type = {
|
||||
.type = __constant_htons(ETH_P_PHONET),
|
||||
.dev = NULL,
|
||||
.func = phonet_rcv,
|
||||
};
|
||||
|
||||
/* Transport protocol registration */
|
||||
static struct phonet_protocol *proto_tab[PHONET_NPROTO] __read_mostly;
|
||||
static DEFINE_SPINLOCK(proto_tab_lock);
|
||||
|
||||
int __init_or_module phonet_proto_register(int protocol,
|
||||
struct phonet_protocol *pp)
|
||||
{
|
||||
int err = 0;
|
||||
|
||||
if (protocol >= PHONET_NPROTO)
|
||||
return -EINVAL;
|
||||
|
||||
err = proto_register(pp->prot, 1);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
spin_lock(&proto_tab_lock);
|
||||
if (proto_tab[protocol])
|
||||
err = -EBUSY;
|
||||
else
|
||||
proto_tab[protocol] = pp;
|
||||
spin_unlock(&proto_tab_lock);
|
||||
|
||||
return err;
|
||||
}
|
||||
EXPORT_SYMBOL(phonet_proto_register);
|
||||
|
||||
void phonet_proto_unregister(int protocol, struct phonet_protocol *pp)
|
||||
{
|
||||
spin_lock(&proto_tab_lock);
|
||||
BUG_ON(proto_tab[protocol] != pp);
|
||||
proto_tab[protocol] = NULL;
|
||||
spin_unlock(&proto_tab_lock);
|
||||
proto_unregister(pp->prot);
|
||||
}
|
||||
EXPORT_SYMBOL(phonet_proto_unregister);
|
||||
|
||||
static struct phonet_protocol *phonet_proto_get(int protocol)
|
||||
{
|
||||
struct phonet_protocol *pp;
|
||||
|
||||
if (protocol >= PHONET_NPROTO)
|
||||
return NULL;
|
||||
|
||||
spin_lock(&proto_tab_lock);
|
||||
pp = proto_tab[protocol];
|
||||
if (pp && !try_module_get(pp->prot->owner))
|
||||
pp = NULL;
|
||||
spin_unlock(&proto_tab_lock);
|
||||
|
||||
return pp;
|
||||
}
|
||||
|
||||
static inline void phonet_proto_put(struct phonet_protocol *pp)
|
||||
{
|
||||
module_put(pp->prot->owner);
|
||||
}
|
||||
|
||||
/* Module registration */
|
||||
static int __init phonet_init(void)
|
||||
{
|
||||
int err;
|
||||
|
||||
err = sock_register(&phonet_proto_family);
|
||||
if (err) {
|
||||
printk(KERN_ALERT
|
||||
"phonet protocol family initialization failed\n");
|
||||
return err;
|
||||
}
|
||||
|
||||
dev_add_pack(&phonet_packet_type);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void __exit phonet_exit(void)
|
||||
{
|
||||
sock_unregister(AF_PHONET);
|
||||
dev_remove_pack(&phonet_packet_type);
|
||||
}
|
||||
|
||||
module_init(phonet_init);
|
||||
module_exit(phonet_exit);
|
||||
MODULE_DESCRIPTION("Phonet protocol stack for Linux");
|
||||
MODULE_LICENSE("GPL");
|
Loading…
Reference in a new issue