blob: 10d42f3220ab469b3e23050c99af72cb39c81452 [file] [log] [blame]
Remi Denis-Courmont4b07b3f2008-09-22 20:02:10 -07001/*
2 * File: af_phonet.c
3 *
4 * Phonet protocols family
5 *
6 * Copyright (C) 2008 Nokia Corporation.
7 *
Rémi Denis-Courmont31fdc552012-06-13 22:29:03 +00008 * Authors: Sakari Ailus <sakari.ailus@nokia.com>
9 * Rémi Denis-Courmont
Remi Denis-Courmont4b07b3f2008-09-22 20:02:10 -070010 *
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.
14 *
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.
19 *
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
23 * 02110-1301 USA
24 */
25
26#include <linux/kernel.h>
27#include <linux/module.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090028#include <linux/slab.h>
Remi Denis-Courmont4b07b3f2008-09-22 20:02:10 -070029#include <asm/unaligned.h>
30#include <net/sock.h>
31
32#include <linux/if_phonet.h>
33#include <linux/phonet.h>
34#include <net/phonet/phonet.h>
Remi Denis-Courmontf8ff6022008-09-22 20:03:44 -070035#include <net/phonet/pn_dev.h>
Remi Denis-Courmont4b07b3f2008-09-22 20:02:10 -070036
Alexey Dobriyan566521d2008-11-19 14:17:41 -080037/* Transport protocol registration */
38static struct phonet_protocol *proto_tab[PHONET_NPROTO] __read_mostly;
Alexey Dobriyan566521d2008-11-19 14:17:41 -080039
Dan Carpenterfacb4ed2011-01-10 04:06:58 +000040static struct phonet_protocol *phonet_proto_get(unsigned int protocol)
Alexey Dobriyan566521d2008-11-19 14:17:41 -080041{
42 struct phonet_protocol *pp;
43
44 if (protocol >= PHONET_NPROTO)
45 return NULL;
46
Rémi Denis-Courmont7ed01322009-11-13 05:01:18 +000047 rcu_read_lock();
Rémi Denis-Courmontb2a5dec2009-11-16 22:17:24 +000048 pp = rcu_dereference(proto_tab[protocol]);
Alexey Dobriyan566521d2008-11-19 14:17:41 -080049 if (pp && !try_module_get(pp->prot->owner))
50 pp = NULL;
Rémi Denis-Courmont7ed01322009-11-13 05:01:18 +000051 rcu_read_unlock();
Alexey Dobriyan566521d2008-11-19 14:17:41 -080052
53 return pp;
54}
55
56static inline void phonet_proto_put(struct phonet_protocol *pp)
57{
58 module_put(pp->prot->owner);
59}
Remi Denis-Courmont4b07b3f2008-09-22 20:02:10 -070060
61/* protocol family functions */
62
Eric Paris3f378b62009-11-05 22:18:14 -080063static int pn_socket_create(struct net *net, struct socket *sock, int protocol,
64 int kern)
Remi Denis-Courmont4b07b3f2008-09-22 20:02:10 -070065{
Remi Denis-Courmontba113a92008-09-22 20:05:19 -070066 struct sock *sk;
67 struct pn_sock *pn;
Remi Denis-Courmont4b07b3f2008-09-22 20:02:10 -070068 struct phonet_protocol *pnp;
69 int err;
70
Remi Denis-Courmont4b07b3f2008-09-22 20:02:10 -070071 if (!capable(CAP_SYS_ADMIN))
72 return -EPERM;
73
74 if (protocol == 0) {
75 /* Default protocol selection */
76 switch (sock->type) {
77 case SOCK_DGRAM:
78 protocol = PN_PROTO_PHONET;
79 break;
Rémi Denis-Courmont96414582008-10-05 11:15:13 -070080 case SOCK_SEQPACKET:
81 protocol = PN_PROTO_PIPE;
82 break;
Remi Denis-Courmont4b07b3f2008-09-22 20:02:10 -070083 default:
84 return -EPROTONOSUPPORT;
85 }
86 }
87
88 pnp = phonet_proto_get(protocol);
Rémi Denis-Courmont25532822008-10-05 11:14:27 -070089 if (pnp == NULL &&
90 request_module("net-pf-%d-proto-%d", PF_PHONET, protocol) == 0)
91 pnp = phonet_proto_get(protocol);
Johannes Berg95a5afc2008-10-16 15:24:51 -070092
Remi Denis-Courmont4b07b3f2008-09-22 20:02:10 -070093 if (pnp == NULL)
94 return -EPROTONOSUPPORT;
95 if (sock->type != pnp->sock_type) {
96 err = -EPROTONOSUPPORT;
97 goto out;
98 }
99
Eric W. Biederman11aa9c22015-05-08 21:09:13 -0500100 sk = sk_alloc(net, PF_PHONET, GFP_KERNEL, pnp->prot, kern);
Remi Denis-Courmontba113a92008-09-22 20:05:19 -0700101 if (sk == NULL) {
102 err = -ENOMEM;
103 goto out;
104 }
105
106 sock_init_data(sock, sk);
107 sock->state = SS_UNCONNECTED;
108 sock->ops = pnp->ops;
109 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
110 sk->sk_protocol = protocol;
111 pn = pn_sk(sk);
112 pn->sobject = 0;
Rémi Denis-Courmonta8059512011-02-24 23:14:57 +0000113 pn->dobject = 0;
Remi Denis-Courmontba113a92008-09-22 20:05:19 -0700114 pn->resource = 0;
115 sk->sk_prot->init(sk);
116 err = 0;
Remi Denis-Courmont4b07b3f2008-09-22 20:02:10 -0700117
118out:
119 phonet_proto_put(pnp);
120 return err;
121}
122
Stephen Hemmingerec1b4cf2009-10-05 05:58:39 +0000123static const struct net_proto_family phonet_proto_family = {
Rémi Denis-Courmont25532822008-10-05 11:14:27 -0700124 .family = PF_PHONET,
Remi Denis-Courmont4b07b3f2008-09-22 20:02:10 -0700125 .create = pn_socket_create,
126 .owner = THIS_MODULE,
127};
128
Remi Denis-Courmont5f770762008-09-22 20:08:04 -0700129/* Phonet device header operations */
130static int pn_header_create(struct sk_buff *skb, struct net_device *dev,
131 unsigned short type, const void *daddr,
Eric Dumazet95c96172012-04-15 05:58:06 +0000132 const void *saddr, unsigned int len)
Remi Denis-Courmont5f770762008-09-22 20:08:04 -0700133{
134 u8 *media = skb_push(skb, 1);
135
136 if (type != ETH_P_PHONET)
137 return -1;
138
139 if (!saddr)
140 saddr = dev->dev_addr;
141 *media = *(const u8 *)saddr;
142 return 1;
143}
144
145static int pn_header_parse(const struct sk_buff *skb, unsigned char *haddr)
146{
147 const u8 *media = skb_mac_header(skb);
148 *haddr = *media;
149 return 1;
150}
151
152struct header_ops phonet_header_ops = {
153 .create = pn_header_create,
154 .parse = pn_header_parse,
155};
156EXPORT_SYMBOL(phonet_header_ops);
157
Remi Denis-Courmont107d0d92008-09-22 20:05:57 -0700158/*
159 * Prepends an ISI header and sends a datagram.
160 */
161static int pn_send(struct sk_buff *skb, struct net_device *dev,
Remi Denis-Courmontbe0c52b2008-09-22 20:09:13 -0700162 u16 dst, u16 src, u8 res, u8 irq)
Remi Denis-Courmont107d0d92008-09-22 20:05:57 -0700163{
164 struct phonethdr *ph;
165 int err;
166
Rémi Denis-Courmontebfe92c2008-11-16 19:48:49 -0800167 if (skb->len + 2 > 0xffff /* Phonet length field limit */ ||
168 skb->len + sizeof(struct phonethdr) > dev->mtu) {
Remi Denis-Courmont107d0d92008-09-22 20:05:57 -0700169 err = -EMSGSIZE;
170 goto drop;
171 }
172
Rémi Denis-Courmont18a11662009-09-23 03:17:11 +0000173 /* Broadcast sending is not implemented */
174 if (pn_addr(dst) == PNADDR_BROADCAST) {
175 err = -EOPNOTSUPP;
176 goto drop;
177 }
178
Remi Denis-Courmont107d0d92008-09-22 20:05:57 -0700179 skb_reset_transport_header(skb);
180 WARN_ON(skb_headroom(skb) & 1); /* HW assumes word alignment */
181 skb_push(skb, sizeof(struct phonethdr));
182 skb_reset_network_header(skb);
183 ph = pn_hdr(skb);
184 ph->pn_rdev = pn_dev(dst);
185 ph->pn_sdev = pn_dev(src);
186 ph->pn_res = res;
187 ph->pn_length = __cpu_to_be16(skb->len + 2 - sizeof(*ph));
188 ph->pn_robj = pn_obj(dst);
189 ph->pn_sobj = pn_obj(src);
190
191 skb->protocol = htons(ETH_P_PHONET);
192 skb->priority = 0;
193 skb->dev = dev;
194
Rémi Denis-Courmontaa6c45f2009-10-14 00:48:30 +0000195 if (skb->pkt_type == PACKET_LOOPBACK) {
Remi Denis-Courmont107d0d92008-09-22 20:05:57 -0700196 skb_reset_mac_header(skb);
Remi Denis-Courmont107d0d92008-09-22 20:05:57 -0700197 skb_orphan(skb);
Rémi Denis-Courmontb765e842011-03-08 22:44:07 +0000198 err = (irq ? netif_rx(skb) : netif_rx_ni(skb)) ? -ENOBUFS : 0;
Remi Denis-Courmont107d0d92008-09-22 20:05:57 -0700199 } else {
200 err = dev_hard_header(skb, dev, ntohs(skb->protocol),
201 NULL, NULL, skb->len);
202 if (err < 0) {
203 err = -EHOSTUNREACH;
204 goto drop;
205 }
206 err = dev_queue_xmit(skb);
Rémi Denis-Courmontb765e842011-03-08 22:44:07 +0000207 if (unlikely(err > 0))
208 err = net_xmit_errno(err);
Remi Denis-Courmont107d0d92008-09-22 20:05:57 -0700209 }
210
211 return err;
212drop:
213 kfree_skb(skb);
214 return err;
215}
216
Remi Denis-Courmontbe0c52b2008-09-22 20:09:13 -0700217static int pn_raw_send(const void *data, int len, struct net_device *dev,
218 u16 dst, u16 src, u8 res)
219{
220 struct sk_buff *skb = alloc_skb(MAX_PHONET_HEADER + len, GFP_ATOMIC);
221 if (skb == NULL)
222 return -ENOMEM;
223
Rémi Denis-Courmontaa6c45f2009-10-14 00:48:30 +0000224 if (phonet_address_lookup(dev_net(dev), pn_addr(dst)) == 0)
225 skb->pkt_type = PACKET_LOOPBACK;
226
Remi Denis-Courmontbe0c52b2008-09-22 20:09:13 -0700227 skb_reserve(skb, MAX_PHONET_HEADER);
228 __skb_put(skb, len);
229 skb_copy_to_linear_data(skb, data, len);
230 return pn_send(skb, dev, dst, src, res, 1);
231}
232
Remi Denis-Courmont107d0d92008-09-22 20:05:57 -0700233/*
234 * Create a Phonet header for the skb and send it out. Returns
235 * non-zero error code if failed. The skb is freed then.
236 */
237int pn_skb_send(struct sock *sk, struct sk_buff *skb,
238 const struct sockaddr_pn *target)
239{
Rémi Denis-Courmontaa6c45f2009-10-14 00:48:30 +0000240 struct net *net = sock_net(sk);
Remi Denis-Courmont107d0d92008-09-22 20:05:57 -0700241 struct net_device *dev;
242 struct pn_sock *pn = pn_sk(sk);
243 int err;
Rémi Denis-Courmonta8059512011-02-24 23:14:57 +0000244 u16 src, dst;
245 u8 daddr, saddr, res;
246
247 src = pn->sobject;
248 if (target != NULL) {
249 dst = pn_sockaddr_get_object(target);
250 res = pn_sockaddr_get_resource(target);
251 } else {
252 dst = pn->dobject;
253 res = pn->resource;
254 }
255 daddr = pn_addr(dst);
Remi Denis-Courmont107d0d92008-09-22 20:05:57 -0700256
257 err = -EHOSTUNREACH;
258 if (sk->sk_bound_dev_if)
Rémi Denis-Courmontaa6c45f2009-10-14 00:48:30 +0000259 dev = dev_get_by_index(net, sk->sk_bound_dev_if);
260 else if (phonet_address_lookup(net, daddr) == 0) {
261 dev = phonet_device_get(net);
262 skb->pkt_type = PACKET_LOOPBACK;
Rémi Denis-Courmontc69d4402011-03-08 22:44:06 +0000263 } else if (dst == 0) {
Rémi Denis-Courmontb6a563b2010-09-15 12:30:13 +0000264 /* Resource routing (small race until phonet_rcv()) */
Rémi Denis-Courmontc69d4402011-03-08 22:44:06 +0000265 struct sock *sk = pn_find_sock_by_res(net, res);
Rémi Denis-Courmontb6a563b2010-09-15 12:30:13 +0000266 if (sk) {
267 sock_put(sk);
268 dev = phonet_device_get(net);
269 skb->pkt_type = PACKET_LOOPBACK;
270 } else
271 dev = phonet_route_output(net, daddr);
Rémi Denis-Courmontaa6c45f2009-10-14 00:48:30 +0000272 } else
273 dev = phonet_route_output(net, daddr);
274
Remi Denis-Courmont107d0d92008-09-22 20:05:57 -0700275 if (!dev || !(dev->flags & IFF_UP))
276 goto drop;
277
278 saddr = phonet_address_get(dev, daddr);
279 if (saddr == PN_NO_ADDR)
280 goto drop;
281
Remi Denis-Courmont107d0d92008-09-22 20:05:57 -0700282 if (!pn_addr(src))
283 src = pn_object(saddr, pn_obj(src));
284
Rémi Denis-Courmonta8059512011-02-24 23:14:57 +0000285 err = pn_send(skb, dev, dst, src, res, 0);
Remi Denis-Courmont107d0d92008-09-22 20:05:57 -0700286 dev_put(dev);
287 return err;
288
289drop:
290 kfree_skb(skb);
291 if (dev)
292 dev_put(dev);
293 return err;
294}
295EXPORT_SYMBOL(pn_skb_send);
296
Remi Denis-Courmontbe0c52b2008-09-22 20:09:13 -0700297/* Do not send an error message in response to an error message */
298static inline int can_respond(struct sk_buff *skb)
299{
300 const struct phonethdr *ph;
301 const struct phonetmsg *pm;
302 u8 submsg_id;
303
304 if (!pskb_may_pull(skb, 3))
305 return 0;
306
307 ph = pn_hdr(skb);
Remi Denis-Courmontbe0c52b2008-09-22 20:09:13 -0700308 if (ph->pn_res == PN_PREFIX && !pskb_may_pull(skb, 5))
309 return 0;
Remi Denis-Courmontc3a90c72008-10-26 23:07:25 -0700310 if (ph->pn_res == PN_COMMGR) /* indications */
311 return 0;
Remi Denis-Courmontbe0c52b2008-09-22 20:09:13 -0700312
313 ph = pn_hdr(skb); /* re-acquires the pointer */
314 pm = pn_msg(skb);
315 if (pm->pn_msg_id != PN_COMMON_MESSAGE)
316 return 1;
317 submsg_id = (ph->pn_res == PN_PREFIX)
318 ? pm->pn_e_submsg_id : pm->pn_submsg_id;
319 if (submsg_id != PN_COMM_ISA_ENTITY_NOT_REACHABLE_RESP &&
320 pm->pn_e_submsg_id != PN_COMM_SERVICE_NOT_IDENTIFIED_RESP)
321 return 1;
322 return 0;
323}
324
325static int send_obj_unreachable(struct sk_buff *rskb)
326{
327 const struct phonethdr *oph = pn_hdr(rskb);
328 const struct phonetmsg *opm = pn_msg(rskb);
329 struct phonetmsg resp;
330
331 memset(&resp, 0, sizeof(resp));
332 resp.pn_trans_id = opm->pn_trans_id;
333 resp.pn_msg_id = PN_COMMON_MESSAGE;
334 if (oph->pn_res == PN_PREFIX) {
335 resp.pn_e_res_id = opm->pn_e_res_id;
336 resp.pn_e_submsg_id = PN_COMM_ISA_ENTITY_NOT_REACHABLE_RESP;
337 resp.pn_e_orig_msg_id = opm->pn_msg_id;
338 resp.pn_e_status = 0;
339 } else {
340 resp.pn_submsg_id = PN_COMM_ISA_ENTITY_NOT_REACHABLE_RESP;
341 resp.pn_orig_msg_id = opm->pn_msg_id;
342 resp.pn_status = 0;
343 }
344 return pn_raw_send(&resp, sizeof(resp), rskb->dev,
345 pn_object(oph->pn_sdev, oph->pn_sobj),
346 pn_object(oph->pn_rdev, oph->pn_robj),
347 oph->pn_res);
348}
349
350static int send_reset_indications(struct sk_buff *rskb)
351{
352 struct phonethdr *oph = pn_hdr(rskb);
353 static const u8 data[4] = {
354 0x00 /* trans ID */, 0x10 /* subscribe msg */,
355 0x00 /* subscription count */, 0x00 /* dummy */
356 };
357
358 return pn_raw_send(data, sizeof(data), rskb->dev,
359 pn_object(oph->pn_sdev, 0x00),
Remi Denis-Courmontc3a90c72008-10-26 23:07:25 -0700360 pn_object(oph->pn_rdev, oph->pn_robj),
361 PN_COMMGR);
Remi Denis-Courmontbe0c52b2008-09-22 20:09:13 -0700362}
363
364
Remi Denis-Courmont4b07b3f2008-09-22 20:02:10 -0700365/* packet type functions */
366
367/*
368 * Stuff received packets to associated sockets.
369 * On error, returns non-zero and releases the skb.
370 */
371static int phonet_rcv(struct sk_buff *skb, struct net_device *dev,
372 struct packet_type *pkttype,
373 struct net_device *orig_dev)
374{
remi.denis-courmont@nokia4b8f7042009-01-23 03:00:26 +0000375 struct net *net = dev_net(dev);
Remi Denis-Courmont4b07b3f2008-09-22 20:02:10 -0700376 struct phonethdr *ph;
377 struct sockaddr_pn sa;
378 u16 len;
379
Remi Denis-Courmont4b07b3f2008-09-22 20:02:10 -0700380 /* check we have at least a full Phonet header */
381 if (!pskb_pull(skb, sizeof(struct phonethdr)))
382 goto out;
383
384 /* check that the advertised length is correct */
385 ph = pn_hdr(skb);
386 len = get_unaligned_be16(&ph->pn_length);
387 if (len < 2)
388 goto out;
389 len -= 2;
390 if ((len > skb->len) || pskb_trim(skb, len))
391 goto out;
392 skb_reset_transport_header(skb);
393
394 pn_skb_get_dst_sockaddr(skb, &sa);
Remi Denis-Courmont4b07b3f2008-09-22 20:02:10 -0700395
Rémi Denis-Courmontf14001f2009-10-14 00:48:27 +0000396 /* check if this is broadcasted */
397 if (pn_sockaddr_get_addr(&sa) == PNADDR_BROADCAST) {
398 pn_deliver_sock_broadcast(net, skb);
399 goto out;
400 }
401
Rémi Denis-Courmontb6a563b2010-09-15 12:30:13 +0000402 /* resource routing */
403 if (pn_sockaddr_get_object(&sa) == 0) {
404 struct sock *sk = pn_find_sock_by_res(net, sa.spn_resource);
405 if (sk)
406 return sk_receive_skb(sk, skb, 0);
407 }
408
remi.denis-courmont@nokia4b8f7042009-01-23 03:00:26 +0000409 /* check if we are the destination */
410 if (phonet_address_lookup(net, pn_sockaddr_get_addr(&sa)) == 0) {
411 /* Phonet packet input */
412 struct sock *sk = pn_find_sock_by_sa(net, &sa);
413
414 if (sk)
415 return sk_receive_skb(sk, skb, 0);
416
Remi Denis-Courmontbe0c52b2008-09-22 20:09:13 -0700417 if (can_respond(skb)) {
418 send_obj_unreachable(skb);
419 send_reset_indications(skb);
420 }
Rémi Denis-Courmont86a0a1e2009-10-14 00:48:31 +0000421 } else if (unlikely(skb->pkt_type == PACKET_LOOPBACK))
422 goto out; /* Race between address deletion and loopback */
423 else {
424 /* Phonet packet routing */
425 struct net_device *out_dev;
426
427 out_dev = phonet_route_output(net, pn_sockaddr_get_addr(&sa));
428 if (!out_dev) {
Joe Perchesba7a46f2014-11-11 10:59:17 -0800429 net_dbg_ratelimited("No Phonet route to %02X\n",
430 pn_sockaddr_get_addr(&sa));
Rémi Denis-Courmont86a0a1e2009-10-14 00:48:31 +0000431 goto out;
432 }
433
434 __skb_push(skb, sizeof(struct phonethdr));
435 skb->dev = out_dev;
436 if (out_dev == dev) {
Joe Perchesba7a46f2014-11-11 10:59:17 -0800437 net_dbg_ratelimited("Phonet loop to %02X on %s\n",
438 pn_sockaddr_get_addr(&sa),
439 dev->name);
Rémi Denis-Courmont86a0a1e2009-10-14 00:48:31 +0000440 goto out_dev;
441 }
442 /* Some drivers (e.g. TUN) do not allocate HW header space */
443 if (skb_cow_head(skb, out_dev->hard_header_len))
444 goto out_dev;
445
446 if (dev_hard_header(skb, out_dev, ETH_P_PHONET, NULL, NULL,
447 skb->len) < 0)
448 goto out_dev;
449 dev_queue_xmit(skb);
450 dev_put(out_dev);
451 return NET_RX_SUCCESS;
452out_dev:
453 dev_put(out_dev);
Remi Denis-Courmontbe0c52b2008-09-22 20:09:13 -0700454 }
Remi Denis-Courmontba113a92008-09-22 20:05:19 -0700455
Remi Denis-Courmont4b07b3f2008-09-22 20:02:10 -0700456out:
457 kfree_skb(skb);
458 return NET_RX_DROP;
459}
460
Stephen Hemminger7546dd92009-03-09 08:18:29 +0000461static struct packet_type phonet_packet_type __read_mostly = {
Harvey Harrison09640e62009-02-01 00:45:17 -0800462 .type = cpu_to_be16(ETH_P_PHONET),
Remi Denis-Courmont4b07b3f2008-09-22 20:02:10 -0700463 .func = phonet_rcv,
464};
465
Rémi Denis-Courmont7ed01322009-11-13 05:01:18 +0000466static DEFINE_MUTEX(proto_tab_lock);
467
Dan Carpenterfacb4ed2011-01-10 04:06:58 +0000468int __init_or_module phonet_proto_register(unsigned int protocol,
Remi Denis-Courmont4b07b3f2008-09-22 20:02:10 -0700469 struct phonet_protocol *pp)
470{
471 int err = 0;
472
473 if (protocol >= PHONET_NPROTO)
474 return -EINVAL;
475
476 err = proto_register(pp->prot, 1);
477 if (err)
478 return err;
479
Rémi Denis-Courmont7ed01322009-11-13 05:01:18 +0000480 mutex_lock(&proto_tab_lock);
Remi Denis-Courmont4b07b3f2008-09-22 20:02:10 -0700481 if (proto_tab[protocol])
482 err = -EBUSY;
483 else
Eric Dumazetcf778b02012-01-12 04:41:32 +0000484 rcu_assign_pointer(proto_tab[protocol], pp);
Rémi Denis-Courmont7ed01322009-11-13 05:01:18 +0000485 mutex_unlock(&proto_tab_lock);
Remi Denis-Courmont4b07b3f2008-09-22 20:02:10 -0700486
487 return err;
488}
489EXPORT_SYMBOL(phonet_proto_register);
490
Dan Carpenterfacb4ed2011-01-10 04:06:58 +0000491void phonet_proto_unregister(unsigned int protocol, struct phonet_protocol *pp)
Remi Denis-Courmont4b07b3f2008-09-22 20:02:10 -0700492{
Rémi Denis-Courmont7ed01322009-11-13 05:01:18 +0000493 mutex_lock(&proto_tab_lock);
Remi Denis-Courmont4b07b3f2008-09-22 20:02:10 -0700494 BUG_ON(proto_tab[protocol] != pp);
Stephen Hemmingera9b3cd72011-08-01 16:19:00 +0000495 RCU_INIT_POINTER(proto_tab[protocol], NULL);
Rémi Denis-Courmont7ed01322009-11-13 05:01:18 +0000496 mutex_unlock(&proto_tab_lock);
497 synchronize_rcu();
Remi Denis-Courmont4b07b3f2008-09-22 20:02:10 -0700498 proto_unregister(pp->prot);
499}
500EXPORT_SYMBOL(phonet_proto_unregister);
501
Remi Denis-Courmont4b07b3f2008-09-22 20:02:10 -0700502/* Module registration */
503static int __init phonet_init(void)
504{
505 int err;
506
remi.denis-courmont@nokia76e02cf2009-01-23 03:00:27 +0000507 err = phonet_device_init();
508 if (err)
509 return err;
510
Rémi Denis-Courmont6b0d07b2009-11-09 02:17:01 +0000511 pn_sock_init();
Remi Denis-Courmont4b07b3f2008-09-22 20:02:10 -0700512 err = sock_register(&phonet_proto_family);
513 if (err) {
514 printk(KERN_ALERT
515 "phonet protocol family initialization failed\n");
remi.denis-courmont@nokia76e02cf2009-01-23 03:00:27 +0000516 goto err_sock;
Remi Denis-Courmont4b07b3f2008-09-22 20:02:10 -0700517 }
518
519 dev_add_pack(&phonet_packet_type);
Remi Denis-Courmont87ab4e22008-09-22 20:08:39 -0700520 phonet_sysctl_init();
Remi Denis-Courmont107d0d92008-09-22 20:05:57 -0700521
522 err = isi_register();
523 if (err)
524 goto err;
Remi Denis-Courmont4b07b3f2008-09-22 20:02:10 -0700525 return 0;
Remi Denis-Courmont107d0d92008-09-22 20:05:57 -0700526
527err:
Remi Denis-Courmont87ab4e22008-09-22 20:08:39 -0700528 phonet_sysctl_exit();
Rémi Denis-Courmont25532822008-10-05 11:14:27 -0700529 sock_unregister(PF_PHONET);
Remi Denis-Courmont107d0d92008-09-22 20:05:57 -0700530 dev_remove_pack(&phonet_packet_type);
remi.denis-courmont@nokia76e02cf2009-01-23 03:00:27 +0000531err_sock:
Remi Denis-Courmont107d0d92008-09-22 20:05:57 -0700532 phonet_device_exit();
533 return err;
Remi Denis-Courmont4b07b3f2008-09-22 20:02:10 -0700534}
535
536static void __exit phonet_exit(void)
537{
Remi Denis-Courmont107d0d92008-09-22 20:05:57 -0700538 isi_unregister();
Remi Denis-Courmont87ab4e22008-09-22 20:08:39 -0700539 phonet_sysctl_exit();
Rémi Denis-Courmont25532822008-10-05 11:14:27 -0700540 sock_unregister(PF_PHONET);
Remi Denis-Courmont4b07b3f2008-09-22 20:02:10 -0700541 dev_remove_pack(&phonet_packet_type);
Remi Denis-Courmontf8ff6022008-09-22 20:03:44 -0700542 phonet_device_exit();
Remi Denis-Courmont4b07b3f2008-09-22 20:02:10 -0700543}
544
545module_init(phonet_init);
546module_exit(phonet_exit);
547MODULE_DESCRIPTION("Phonet protocol stack for Linux");
548MODULE_LICENSE("GPL");
Rémi Denis-Courmont25532822008-10-05 11:14:27 -0700549MODULE_ALIAS_NETPROTO(PF_PHONET);