1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26#include <linux/kernel.h>
27#include <linux/module.h>
28#include <asm/unaligned.h>
29#include <net/sock.h>
30
31#include <linux/if_phonet.h>
32#include <linux/phonet.h>
33#include <net/phonet/phonet.h>
34#include <net/phonet/pn_dev.h>
35
36
37static struct phonet_protocol *proto_tab[PHONET_NPROTO] __read_mostly;
38static DEFINE_SPINLOCK(proto_tab_lock);
39
40static struct phonet_protocol *phonet_proto_get(int protocol)
41{
42 struct phonet_protocol *pp;
43
44 if (protocol >= PHONET_NPROTO)
45 return NULL;
46
47 spin_lock(&proto_tab_lock);
48 pp = proto_tab[protocol];
49 if (pp && !try_module_get(pp->prot->owner))
50 pp = NULL;
51 spin_unlock(&proto_tab_lock);
52
53 return pp;
54}
55
56static inline void phonet_proto_put(struct phonet_protocol *pp)
57{
58 module_put(pp->prot->owner);
59}
60
61
62
63static int pn_socket_create(struct net *net, struct socket *sock, int protocol)
64{
65 struct sock *sk;
66 struct pn_sock *pn;
67 struct phonet_protocol *pnp;
68 int err;
69
70 if (!capable(CAP_SYS_ADMIN))
71 return -EPERM;
72
73 if (protocol == 0) {
74
75 switch (sock->type) {
76 case SOCK_DGRAM:
77 protocol = PN_PROTO_PHONET;
78 break;
79 case SOCK_SEQPACKET:
80 protocol = PN_PROTO_PIPE;
81 break;
82 default:
83 return -EPROTONOSUPPORT;
84 }
85 }
86
87 pnp = phonet_proto_get(protocol);
88 if (pnp == NULL &&
89 request_module("net-pf-%d-proto-%d", PF_PHONET, protocol) == 0)
90 pnp = phonet_proto_get(protocol);
91
92 if (pnp == NULL)
93 return -EPROTONOSUPPORT;
94 if (sock->type != pnp->sock_type) {
95 err = -EPROTONOSUPPORT;
96 goto out;
97 }
98
99 sk = sk_alloc(net, PF_PHONET, GFP_KERNEL, pnp->prot);
100 if (sk == NULL) {
101 err = -ENOMEM;
102 goto out;
103 }
104
105 sock_init_data(sock, sk);
106 sock->state = SS_UNCONNECTED;
107 sock->ops = pnp->ops;
108 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
109 sk->sk_protocol = protocol;
110 pn = pn_sk(sk);
111 pn->sobject = 0;
112 pn->resource = 0;
113 sk->sk_prot->init(sk);
114 err = 0;
115
116out:
117 phonet_proto_put(pnp);
118 return err;
119}
120
121static struct net_proto_family phonet_proto_family = {
122 .family = PF_PHONET,
123 .create = pn_socket_create,
124 .owner = THIS_MODULE,
125};
126
127
128static int pn_header_create(struct sk_buff *skb, struct net_device *dev,
129 unsigned short type, const void *daddr,
130 const void *saddr, unsigned len)
131{
132 u8 *media = skb_push(skb, 1);
133
134 if (type != ETH_P_PHONET)
135 return -1;
136
137 if (!saddr)
138 saddr = dev->dev_addr;
139 *media = *(const u8 *)saddr;
140 return 1;
141}
142
143static int pn_header_parse(const struct sk_buff *skb, unsigned char *haddr)
144{
145 const u8 *media = skb_mac_header(skb);
146 *haddr = *media;
147 return 1;
148}
149
150struct header_ops phonet_header_ops = {
151 .create = pn_header_create,
152 .parse = pn_header_parse,
153};
154EXPORT_SYMBOL(phonet_header_ops);
155
156
157
158
159static int pn_send(struct sk_buff *skb, struct net_device *dev,
160 u16 dst, u16 src, u8 res, u8 irq)
161{
162 struct phonethdr *ph;
163 int err;
164
165 if (skb->len + 2 > 0xffff ||
166 skb->len + sizeof(struct phonethdr) > dev->mtu) {
167 err = -EMSGSIZE;
168 goto drop;
169 }
170
171
172 if (pn_addr(dst) == PNADDR_BROADCAST) {
173 err = -EOPNOTSUPP;
174 goto drop;
175 }
176
177 skb_reset_transport_header(skb);
178 WARN_ON(skb_headroom(skb) & 1);
179 skb_push(skb, sizeof(struct phonethdr));
180 skb_reset_network_header(skb);
181 ph = pn_hdr(skb);
182 ph->pn_rdev = pn_dev(dst);
183 ph->pn_sdev = pn_dev(src);
184 ph->pn_res = res;
185 ph->pn_length = __cpu_to_be16(skb->len + 2 - sizeof(*ph));
186 ph->pn_robj = pn_obj(dst);
187 ph->pn_sobj = pn_obj(src);
188
189 skb->protocol = htons(ETH_P_PHONET);
190 skb->priority = 0;
191 skb->dev = dev;
192
193 if (pn_addr(src) == pn_addr(dst)) {
194 skb_reset_mac_header(skb);
195 skb->pkt_type = PACKET_LOOPBACK;
196 skb_orphan(skb);
197 if (irq)
198 netif_rx(skb);
199 else
200 netif_rx_ni(skb);
201 err = 0;
202 } else {
203 err = dev_hard_header(skb, dev, ntohs(skb->protocol),
204 NULL, NULL, skb->len);
205 if (err < 0) {
206 err = -EHOSTUNREACH;
207 goto drop;
208 }
209 err = dev_queue_xmit(skb);
210 }
211
212 return err;
213drop:
214 kfree_skb(skb);
215 return err;
216}
217
218static int pn_raw_send(const void *data, int len, struct net_device *dev,
219 u16 dst, u16 src, u8 res)
220{
221 struct sk_buff *skb = alloc_skb(MAX_PHONET_HEADER + len, GFP_ATOMIC);
222 if (skb == NULL)
223 return -ENOMEM;
224
225 skb_reserve(skb, MAX_PHONET_HEADER);
226 __skb_put(skb, len);
227 skb_copy_to_linear_data(skb, data, len);
228 return pn_send(skb, dev, dst, src, res, 1);
229}
230
231
232
233
234
235int pn_skb_send(struct sock *sk, struct sk_buff *skb,
236 const struct sockaddr_pn *target)
237{
238 struct net_device *dev;
239 struct pn_sock *pn = pn_sk(sk);
240 int err;
241 u16 src;
242 u8 daddr = pn_sockaddr_get_addr(target), saddr = PN_NO_ADDR;
243
244 err = -EHOSTUNREACH;
245 if (sk->sk_bound_dev_if)
246 dev = dev_get_by_index(sock_net(sk), sk->sk_bound_dev_if);
247 else
248 dev = phonet_device_get(sock_net(sk));
249 if (!dev || !(dev->flags & IFF_UP))
250 goto drop;
251
252 saddr = phonet_address_get(dev, daddr);
253 if (saddr == PN_NO_ADDR)
254 goto drop;
255
256 src = pn->sobject;
257 if (!pn_addr(src))
258 src = pn_object(saddr, pn_obj(src));
259
260 err = pn_send(skb, dev, pn_sockaddr_get_object(target),
261 src, pn_sockaddr_get_resource(target), 0);
262 dev_put(dev);
263 return err;
264
265drop:
266 kfree_skb(skb);
267 if (dev)
268 dev_put(dev);
269 return err;
270}
271EXPORT_SYMBOL(pn_skb_send);
272
273
274static inline int can_respond(struct sk_buff *skb)
275{
276 const struct phonethdr *ph;
277 const struct phonetmsg *pm;
278 u8 submsg_id;
279
280 if (!pskb_may_pull(skb, 3))
281 return 0;
282
283 ph = pn_hdr(skb);
284 if (ph->pn_res == PN_PREFIX && !pskb_may_pull(skb, 5))
285 return 0;
286 if (ph->pn_res == PN_COMMGR)
287 return 0;
288
289 ph = pn_hdr(skb);
290 pm = pn_msg(skb);
291 if (pm->pn_msg_id != PN_COMMON_MESSAGE)
292 return 1;
293 submsg_id = (ph->pn_res == PN_PREFIX)
294 ? pm->pn_e_submsg_id : pm->pn_submsg_id;
295 if (submsg_id != PN_COMM_ISA_ENTITY_NOT_REACHABLE_RESP &&
296 pm->pn_e_submsg_id != PN_COMM_SERVICE_NOT_IDENTIFIED_RESP)
297 return 1;
298 return 0;
299}
300
301static int send_obj_unreachable(struct sk_buff *rskb)
302{
303 const struct phonethdr *oph = pn_hdr(rskb);
304 const struct phonetmsg *opm = pn_msg(rskb);
305 struct phonetmsg resp;
306
307 memset(&resp, 0, sizeof(resp));
308 resp.pn_trans_id = opm->pn_trans_id;
309 resp.pn_msg_id = PN_COMMON_MESSAGE;
310 if (oph->pn_res == PN_PREFIX) {
311 resp.pn_e_res_id = opm->pn_e_res_id;
312 resp.pn_e_submsg_id = PN_COMM_ISA_ENTITY_NOT_REACHABLE_RESP;
313 resp.pn_e_orig_msg_id = opm->pn_msg_id;
314 resp.pn_e_status = 0;
315 } else {
316 resp.pn_submsg_id = PN_COMM_ISA_ENTITY_NOT_REACHABLE_RESP;
317 resp.pn_orig_msg_id = opm->pn_msg_id;
318 resp.pn_status = 0;
319 }
320 return pn_raw_send(&resp, sizeof(resp), rskb->dev,
321 pn_object(oph->pn_sdev, oph->pn_sobj),
322 pn_object(oph->pn_rdev, oph->pn_robj),
323 oph->pn_res);
324}
325
326static int send_reset_indications(struct sk_buff *rskb)
327{
328 struct phonethdr *oph = pn_hdr(rskb);
329 static const u8 data[4] = {
330 0x00 , 0x10 ,
331 0x00 , 0x00
332 };
333
334 return pn_raw_send(data, sizeof(data), rskb->dev,
335 pn_object(oph->pn_sdev, 0x00),
336 pn_object(oph->pn_rdev, oph->pn_robj),
337 PN_COMMGR);
338}
339
340
341
342
343
344
345
346
347static int phonet_rcv(struct sk_buff *skb, struct net_device *dev,
348 struct packet_type *pkttype,
349 struct net_device *orig_dev)
350{
351 struct net *net = dev_net(dev);
352 struct phonethdr *ph;
353 struct sockaddr_pn sa;
354 u16 len;
355
356
357 if (!pskb_pull(skb, sizeof(struct phonethdr)))
358 goto out;
359
360
361 ph = pn_hdr(skb);
362 len = get_unaligned_be16(&ph->pn_length);
363 if (len < 2)
364 goto out;
365 len -= 2;
366 if ((len > skb->len) || pskb_trim(skb, len))
367 goto out;
368 skb_reset_transport_header(skb);
369
370 pn_skb_get_dst_sockaddr(skb, &sa);
371
372
373 if (phonet_address_lookup(net, pn_sockaddr_get_addr(&sa)) == 0) {
374
375 struct sock *sk = pn_find_sock_by_sa(net, &sa);
376
377 if (sk)
378 return sk_receive_skb(sk, skb, 0);
379
380 if (can_respond(skb)) {
381 send_obj_unreachable(skb);
382 send_reset_indications(skb);
383 }
384 }
385
386out:
387 kfree_skb(skb);
388 return NET_RX_DROP;
389}
390
391static struct packet_type phonet_packet_type __read_mostly = {
392 .type = cpu_to_be16(ETH_P_PHONET),
393 .func = phonet_rcv,
394};
395
396int __init_or_module phonet_proto_register(int protocol,
397 struct phonet_protocol *pp)
398{
399 int err = 0;
400
401 if (protocol >= PHONET_NPROTO)
402 return -EINVAL;
403
404 err = proto_register(pp->prot, 1);
405 if (err)
406 return err;
407
408 spin_lock(&proto_tab_lock);
409 if (proto_tab[protocol])
410 err = -EBUSY;
411 else
412 proto_tab[protocol] = pp;
413 spin_unlock(&proto_tab_lock);
414
415 return err;
416}
417EXPORT_SYMBOL(phonet_proto_register);
418
419void phonet_proto_unregister(int protocol, struct phonet_protocol *pp)
420{
421 spin_lock(&proto_tab_lock);
422 BUG_ON(proto_tab[protocol] != pp);
423 proto_tab[protocol] = NULL;
424 spin_unlock(&proto_tab_lock);
425 proto_unregister(pp->prot);
426}
427EXPORT_SYMBOL(phonet_proto_unregister);
428
429
430static int __init phonet_init(void)
431{
432 int err;
433
434 err = phonet_device_init();
435 if (err)
436 return err;
437
438 err = sock_register(&phonet_proto_family);
439 if (err) {
440 printk(KERN_ALERT
441 "phonet protocol family initialization failed\n");
442 goto err_sock;
443 }
444
445 dev_add_pack(&phonet_packet_type);
446 phonet_sysctl_init();
447
448 err = isi_register();
449 if (err)
450 goto err;
451 return 0;
452
453err:
454 phonet_sysctl_exit();
455 sock_unregister(PF_PHONET);
456 dev_remove_pack(&phonet_packet_type);
457err_sock:
458 phonet_device_exit();
459 return err;
460}
461
462static void __exit phonet_exit(void)
463{
464 isi_unregister();
465 phonet_sysctl_exit();
466 sock_unregister(PF_PHONET);
467 dev_remove_pack(&phonet_packet_type);
468 phonet_device_exit();
469}
470
471module_init(phonet_init);
472module_exit(phonet_exit);
473MODULE_DESCRIPTION("Phonet protocol stack for Linux");
474MODULE_LICENSE("GPL");
475MODULE_ALIAS_NETPROTO(PF_PHONET);
476
