4 * Phonet protocols family
6 * Copyright (C) 2008 Nokia Corporation.
8 * Contact: Remi Denis-Courmont <remi.denis-courmont@nokia.com>
9 * Original author: Sakari Ailus <sakari.ailus@nokia.com>
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * version 2 as published by the Free Software Foundation.
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
26 #include <linux/kernel.h>
27 #include <linux/module.h>
28 #include <asm/unaligned.h>
31 #include <linux/if_phonet.h>
32 #include <linux/phonet.h>
33 #include <net/phonet/phonet.h>
34 #include <net/phonet/pn_dev.h>
36 static struct net_proto_family phonet_proto_family
;
37 static struct phonet_protocol
*phonet_proto_get(int protocol
);
38 static inline void phonet_proto_put(struct phonet_protocol
*pp
);
40 /* protocol family functions */
42 static int pn_socket_create(struct net
*net
, struct socket
*sock
, int protocol
)
46 struct phonet_protocol
*pnp
;
52 if (!capable(CAP_SYS_ADMIN
))
56 /* Default protocol selection */
59 protocol
= PN_PROTO_PHONET
;
62 return -EPROTONOSUPPORT
;
66 pnp
= phonet_proto_get(protocol
);
68 return -EPROTONOSUPPORT
;
69 if (sock
->type
!= pnp
->sock_type
) {
70 err
= -EPROTONOSUPPORT
;
74 sk
= sk_alloc(net
, PF_PHONET
, GFP_KERNEL
, pnp
->prot
);
80 sock_init_data(sock
, sk
);
81 sock
->state
= SS_UNCONNECTED
;
83 sk
->sk_backlog_rcv
= sk
->sk_prot
->backlog_rcv
;
84 sk
->sk_protocol
= protocol
;
88 sk
->sk_prot
->init(sk
);
92 phonet_proto_put(pnp
);
96 static struct net_proto_family phonet_proto_family
= {
98 .create
= pn_socket_create
,
102 /* Phonet device header operations */
103 static int pn_header_create(struct sk_buff
*skb
, struct net_device
*dev
,
104 unsigned short type
, const void *daddr
,
105 const void *saddr
, unsigned len
)
107 u8
*media
= skb_push(skb
, 1);
109 if (type
!= ETH_P_PHONET
)
113 saddr
= dev
->dev_addr
;
114 *media
= *(const u8
*)saddr
;
118 static int pn_header_parse(const struct sk_buff
*skb
, unsigned char *haddr
)
120 const u8
*media
= skb_mac_header(skb
);
125 struct header_ops phonet_header_ops
= {
126 .create
= pn_header_create
,
127 .parse
= pn_header_parse
,
129 EXPORT_SYMBOL(phonet_header_ops
);
132 * Prepends an ISI header and sends a datagram.
134 static int pn_send(struct sk_buff
*skb
, struct net_device
*dev
,
135 u16 dst
, u16 src
, u8 res
)
137 struct phonethdr
*ph
;
140 if (skb
->len
+ 2 > 0xffff) {
141 /* Phonet length field would overflow */
146 skb_reset_transport_header(skb
);
147 WARN_ON(skb_headroom(skb
) & 1); /* HW assumes word alignment */
148 skb_push(skb
, sizeof(struct phonethdr
));
149 skb_reset_network_header(skb
);
151 ph
->pn_rdev
= pn_dev(dst
);
152 ph
->pn_sdev
= pn_dev(src
);
154 ph
->pn_length
= __cpu_to_be16(skb
->len
+ 2 - sizeof(*ph
));
155 ph
->pn_robj
= pn_obj(dst
);
156 ph
->pn_sobj
= pn_obj(src
);
158 skb
->protocol
= htons(ETH_P_PHONET
);
162 if (pn_addr(src
) == pn_addr(dst
)) {
163 skb_reset_mac_header(skb
);
164 skb
->pkt_type
= PACKET_LOOPBACK
;
169 err
= dev_hard_header(skb
, dev
, ntohs(skb
->protocol
),
170 NULL
, NULL
, skb
->len
);
175 err
= dev_queue_xmit(skb
);
185 * Create a Phonet header for the skb and send it out. Returns
186 * non-zero error code if failed. The skb is freed then.
188 int pn_skb_send(struct sock
*sk
, struct sk_buff
*skb
,
189 const struct sockaddr_pn
*target
)
191 struct net_device
*dev
;
192 struct pn_sock
*pn
= pn_sk(sk
);
195 u8 daddr
= pn_sockaddr_get_addr(target
), saddr
= PN_NO_ADDR
;
198 if (sk
->sk_bound_dev_if
)
199 dev
= dev_get_by_index(sock_net(sk
), sk
->sk_bound_dev_if
);
201 dev
= phonet_device_get(sock_net(sk
));
202 if (!dev
|| !(dev
->flags
& IFF_UP
))
205 saddr
= phonet_address_get(dev
, daddr
);
206 if (saddr
== PN_NO_ADDR
)
211 src
= pn_object(saddr
, pn_obj(src
));
213 err
= pn_send(skb
, dev
, pn_sockaddr_get_object(target
),
214 src
, pn_sockaddr_get_resource(target
));
224 EXPORT_SYMBOL(pn_skb_send
);
226 /* packet type functions */
229 * Stuff received packets to associated sockets.
230 * On error, returns non-zero and releases the skb.
232 static int phonet_rcv(struct sk_buff
*skb
, struct net_device
*dev
,
233 struct packet_type
*pkttype
,
234 struct net_device
*orig_dev
)
236 struct phonethdr
*ph
;
238 struct sockaddr_pn sa
;
241 if (dev_net(dev
) != &init_net
)
244 /* check we have at least a full Phonet header */
245 if (!pskb_pull(skb
, sizeof(struct phonethdr
)))
248 /* check that the advertised length is correct */
250 len
= get_unaligned_be16(&ph
->pn_length
);
254 if ((len
> skb
->len
) || pskb_trim(skb
, len
))
256 skb_reset_transport_header(skb
);
258 pn_skb_get_dst_sockaddr(skb
, &sa
);
259 if (pn_sockaddr_get_addr(&sa
) == 0)
260 goto out
; /* currently, we cannot be device 0 */
262 sk
= pn_find_sock_by_sa(&sa
);
266 /* Push data to the socket (or other sockets connected to it). */
267 return sk_receive_skb(sk
, skb
, 0);
274 static struct packet_type phonet_packet_type
= {
275 .type
= __constant_htons(ETH_P_PHONET
),
280 /* Transport protocol registration */
281 static struct phonet_protocol
*proto_tab
[PHONET_NPROTO
] __read_mostly
;
282 static DEFINE_SPINLOCK(proto_tab_lock
);
284 int __init_or_module
phonet_proto_register(int protocol
,
285 struct phonet_protocol
*pp
)
289 if (protocol
>= PHONET_NPROTO
)
292 err
= proto_register(pp
->prot
, 1);
296 spin_lock(&proto_tab_lock
);
297 if (proto_tab
[protocol
])
300 proto_tab
[protocol
] = pp
;
301 spin_unlock(&proto_tab_lock
);
305 EXPORT_SYMBOL(phonet_proto_register
);
307 void phonet_proto_unregister(int protocol
, struct phonet_protocol
*pp
)
309 spin_lock(&proto_tab_lock
);
310 BUG_ON(proto_tab
[protocol
] != pp
);
311 proto_tab
[protocol
] = NULL
;
312 spin_unlock(&proto_tab_lock
);
313 proto_unregister(pp
->prot
);
315 EXPORT_SYMBOL(phonet_proto_unregister
);
317 static struct phonet_protocol
*phonet_proto_get(int protocol
)
319 struct phonet_protocol
*pp
;
321 if (protocol
>= PHONET_NPROTO
)
324 spin_lock(&proto_tab_lock
);
325 pp
= proto_tab
[protocol
];
326 if (pp
&& !try_module_get(pp
->prot
->owner
))
328 spin_unlock(&proto_tab_lock
);
333 static inline void phonet_proto_put(struct phonet_protocol
*pp
)
335 module_put(pp
->prot
->owner
);
338 /* Module registration */
339 static int __init
phonet_init(void)
343 err
= sock_register(&phonet_proto_family
);
346 "phonet protocol family initialization failed\n");
350 phonet_device_init();
351 dev_add_pack(&phonet_packet_type
);
352 phonet_netlink_register();
354 err
= isi_register();
360 sock_unregister(AF_PHONET
);
361 dev_remove_pack(&phonet_packet_type
);
362 phonet_device_exit();
366 static void __exit
phonet_exit(void)
369 sock_unregister(AF_PHONET
);
370 dev_remove_pack(&phonet_packet_type
);
371 phonet_device_exit();
374 module_init(phonet_init
);
375 module_exit(phonet_exit
);
376 MODULE_DESCRIPTION("Phonet protocol stack for Linux");
377 MODULE_LICENSE("GPL");