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 protocol
= PN_PROTO_PIPE
;
65 return -EPROTONOSUPPORT
;
69 pnp
= phonet_proto_get(protocol
);
72 request_module("net-pf-%d-proto-%d", PF_PHONET
, protocol
) == 0)
73 pnp
= phonet_proto_get(protocol
);
76 return -EPROTONOSUPPORT
;
77 if (sock
->type
!= pnp
->sock_type
) {
78 err
= -EPROTONOSUPPORT
;
82 sk
= sk_alloc(net
, PF_PHONET
, GFP_KERNEL
, pnp
->prot
);
88 sock_init_data(sock
, sk
);
89 sock
->state
= SS_UNCONNECTED
;
91 sk
->sk_backlog_rcv
= sk
->sk_prot
->backlog_rcv
;
92 sk
->sk_protocol
= protocol
;
96 sk
->sk_prot
->init(sk
);
100 phonet_proto_put(pnp
);
104 static struct net_proto_family phonet_proto_family
= {
106 .create
= pn_socket_create
,
107 .owner
= THIS_MODULE
,
110 /* Phonet device header operations */
111 static int pn_header_create(struct sk_buff
*skb
, struct net_device
*dev
,
112 unsigned short type
, const void *daddr
,
113 const void *saddr
, unsigned len
)
115 u8
*media
= skb_push(skb
, 1);
117 if (type
!= ETH_P_PHONET
)
121 saddr
= dev
->dev_addr
;
122 *media
= *(const u8
*)saddr
;
126 static int pn_header_parse(const struct sk_buff
*skb
, unsigned char *haddr
)
128 const u8
*media
= skb_mac_header(skb
);
133 struct header_ops phonet_header_ops
= {
134 .create
= pn_header_create
,
135 .parse
= pn_header_parse
,
137 EXPORT_SYMBOL(phonet_header_ops
);
140 * Prepends an ISI header and sends a datagram.
142 static int pn_send(struct sk_buff
*skb
, struct net_device
*dev
,
143 u16 dst
, u16 src
, u8 res
, u8 irq
)
145 struct phonethdr
*ph
;
148 if (skb
->len
+ 2 > 0xffff) {
149 /* Phonet length field would overflow */
154 skb_reset_transport_header(skb
);
155 WARN_ON(skb_headroom(skb
) & 1); /* HW assumes word alignment */
156 skb_push(skb
, sizeof(struct phonethdr
));
157 skb_reset_network_header(skb
);
159 ph
->pn_rdev
= pn_dev(dst
);
160 ph
->pn_sdev
= pn_dev(src
);
162 ph
->pn_length
= __cpu_to_be16(skb
->len
+ 2 - sizeof(*ph
));
163 ph
->pn_robj
= pn_obj(dst
);
164 ph
->pn_sobj
= pn_obj(src
);
166 skb
->protocol
= htons(ETH_P_PHONET
);
170 if (pn_addr(src
) == pn_addr(dst
)) {
171 skb_reset_mac_header(skb
);
172 skb
->pkt_type
= PACKET_LOOPBACK
;
180 err
= dev_hard_header(skb
, dev
, ntohs(skb
->protocol
),
181 NULL
, NULL
, skb
->len
);
186 err
= dev_queue_xmit(skb
);
195 static int pn_raw_send(const void *data
, int len
, struct net_device
*dev
,
196 u16 dst
, u16 src
, u8 res
)
198 struct sk_buff
*skb
= alloc_skb(MAX_PHONET_HEADER
+ len
, GFP_ATOMIC
);
202 skb_reserve(skb
, MAX_PHONET_HEADER
);
204 skb_copy_to_linear_data(skb
, data
, len
);
205 return pn_send(skb
, dev
, dst
, src
, res
, 1);
209 * Create a Phonet header for the skb and send it out. Returns
210 * non-zero error code if failed. The skb is freed then.
212 int pn_skb_send(struct sock
*sk
, struct sk_buff
*skb
,
213 const struct sockaddr_pn
*target
)
215 struct net_device
*dev
;
216 struct pn_sock
*pn
= pn_sk(sk
);
219 u8 daddr
= pn_sockaddr_get_addr(target
), saddr
= PN_NO_ADDR
;
222 if (sk
->sk_bound_dev_if
)
223 dev
= dev_get_by_index(sock_net(sk
), sk
->sk_bound_dev_if
);
225 dev
= phonet_device_get(sock_net(sk
));
226 if (!dev
|| !(dev
->flags
& IFF_UP
))
229 saddr
= phonet_address_get(dev
, daddr
);
230 if (saddr
== PN_NO_ADDR
)
235 src
= pn_object(saddr
, pn_obj(src
));
237 err
= pn_send(skb
, dev
, pn_sockaddr_get_object(target
),
238 src
, pn_sockaddr_get_resource(target
), 0);
248 EXPORT_SYMBOL(pn_skb_send
);
250 /* Do not send an error message in response to an error message */
251 static inline int can_respond(struct sk_buff
*skb
)
253 const struct phonethdr
*ph
;
254 const struct phonetmsg
*pm
;
257 if (!pskb_may_pull(skb
, 3))
261 if (phonet_address_get(skb
->dev
, ph
->pn_rdev
) != ph
->pn_rdev
)
262 return 0; /* we are not the destination */
263 if (ph
->pn_res
== PN_PREFIX
&& !pskb_may_pull(skb
, 5))
266 ph
= pn_hdr(skb
); /* re-acquires the pointer */
268 if (pm
->pn_msg_id
!= PN_COMMON_MESSAGE
)
270 submsg_id
= (ph
->pn_res
== PN_PREFIX
)
271 ? pm
->pn_e_submsg_id
: pm
->pn_submsg_id
;
272 if (submsg_id
!= PN_COMM_ISA_ENTITY_NOT_REACHABLE_RESP
&&
273 pm
->pn_e_submsg_id
!= PN_COMM_SERVICE_NOT_IDENTIFIED_RESP
)
278 static int send_obj_unreachable(struct sk_buff
*rskb
)
280 const struct phonethdr
*oph
= pn_hdr(rskb
);
281 const struct phonetmsg
*opm
= pn_msg(rskb
);
282 struct phonetmsg resp
;
284 memset(&resp
, 0, sizeof(resp
));
285 resp
.pn_trans_id
= opm
->pn_trans_id
;
286 resp
.pn_msg_id
= PN_COMMON_MESSAGE
;
287 if (oph
->pn_res
== PN_PREFIX
) {
288 resp
.pn_e_res_id
= opm
->pn_e_res_id
;
289 resp
.pn_e_submsg_id
= PN_COMM_ISA_ENTITY_NOT_REACHABLE_RESP
;
290 resp
.pn_e_orig_msg_id
= opm
->pn_msg_id
;
291 resp
.pn_e_status
= 0;
293 resp
.pn_submsg_id
= PN_COMM_ISA_ENTITY_NOT_REACHABLE_RESP
;
294 resp
.pn_orig_msg_id
= opm
->pn_msg_id
;
297 return pn_raw_send(&resp
, sizeof(resp
), rskb
->dev
,
298 pn_object(oph
->pn_sdev
, oph
->pn_sobj
),
299 pn_object(oph
->pn_rdev
, oph
->pn_robj
),
303 static int send_reset_indications(struct sk_buff
*rskb
)
305 struct phonethdr
*oph
= pn_hdr(rskb
);
306 static const u8 data
[4] = {
307 0x00 /* trans ID */, 0x10 /* subscribe msg */,
308 0x00 /* subscription count */, 0x00 /* dummy */
311 return pn_raw_send(data
, sizeof(data
), rskb
->dev
,
312 pn_object(oph
->pn_sdev
, 0x00),
313 pn_object(oph
->pn_rdev
, oph
->pn_robj
), 0x10);
317 /* packet type functions */
320 * Stuff received packets to associated sockets.
321 * On error, returns non-zero and releases the skb.
323 static int phonet_rcv(struct sk_buff
*skb
, struct net_device
*dev
,
324 struct packet_type
*pkttype
,
325 struct net_device
*orig_dev
)
327 struct phonethdr
*ph
;
329 struct sockaddr_pn sa
;
332 if (dev_net(dev
) != &init_net
)
335 /* check we have at least a full Phonet header */
336 if (!pskb_pull(skb
, sizeof(struct phonethdr
)))
339 /* check that the advertised length is correct */
341 len
= get_unaligned_be16(&ph
->pn_length
);
345 if ((len
> skb
->len
) || pskb_trim(skb
, len
))
347 skb_reset_transport_header(skb
);
349 pn_skb_get_dst_sockaddr(skb
, &sa
);
350 if (pn_sockaddr_get_addr(&sa
) == 0)
351 goto out
; /* currently, we cannot be device 0 */
353 sk
= pn_find_sock_by_sa(&sa
);
355 if (can_respond(skb
)) {
356 send_obj_unreachable(skb
);
357 send_reset_indications(skb
);
362 /* Push data to the socket (or other sockets connected to it). */
363 return sk_receive_skb(sk
, skb
, 0);
370 static struct packet_type phonet_packet_type
= {
371 .type
= __constant_htons(ETH_P_PHONET
),
376 /* Transport protocol registration */
377 static struct phonet_protocol
*proto_tab
[PHONET_NPROTO
] __read_mostly
;
378 static DEFINE_SPINLOCK(proto_tab_lock
);
380 int __init_or_module
phonet_proto_register(int protocol
,
381 struct phonet_protocol
*pp
)
385 if (protocol
>= PHONET_NPROTO
)
388 err
= proto_register(pp
->prot
, 1);
392 spin_lock(&proto_tab_lock
);
393 if (proto_tab
[protocol
])
396 proto_tab
[protocol
] = pp
;
397 spin_unlock(&proto_tab_lock
);
401 EXPORT_SYMBOL(phonet_proto_register
);
403 void phonet_proto_unregister(int protocol
, struct phonet_protocol
*pp
)
405 spin_lock(&proto_tab_lock
);
406 BUG_ON(proto_tab
[protocol
] != pp
);
407 proto_tab
[protocol
] = NULL
;
408 spin_unlock(&proto_tab_lock
);
409 proto_unregister(pp
->prot
);
411 EXPORT_SYMBOL(phonet_proto_unregister
);
413 static struct phonet_protocol
*phonet_proto_get(int protocol
)
415 struct phonet_protocol
*pp
;
417 if (protocol
>= PHONET_NPROTO
)
420 spin_lock(&proto_tab_lock
);
421 pp
= proto_tab
[protocol
];
422 if (pp
&& !try_module_get(pp
->prot
->owner
))
424 spin_unlock(&proto_tab_lock
);
429 static inline void phonet_proto_put(struct phonet_protocol
*pp
)
431 module_put(pp
->prot
->owner
);
434 /* Module registration */
435 static int __init
phonet_init(void)
439 err
= sock_register(&phonet_proto_family
);
442 "phonet protocol family initialization failed\n");
446 phonet_device_init();
447 dev_add_pack(&phonet_packet_type
);
448 phonet_netlink_register();
449 phonet_sysctl_init();
451 err
= isi_register();
457 phonet_sysctl_exit();
458 sock_unregister(PF_PHONET
);
459 dev_remove_pack(&phonet_packet_type
);
460 phonet_device_exit();
464 static void __exit
phonet_exit(void)
467 phonet_sysctl_exit();
468 sock_unregister(PF_PHONET
);
469 dev_remove_pack(&phonet_packet_type
);
470 phonet_device_exit();
473 module_init(phonet_init
);
474 module_exit(phonet_exit
);
475 MODULE_DESCRIPTION("Phonet protocol stack for Linux");
476 MODULE_LICENSE("GPL");
477 MODULE_ALIAS_NETPROTO(PF_PHONET
);