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-rw-r--r--net/caif/cfcnfg.c529
-rw-r--r--net/caif/cfpkt_skbuff.c571
2 files changed, 1100 insertions, 0 deletions
diff --git a/net/caif/cfcnfg.c b/net/caif/cfcnfg.c
new file mode 100644
index 000000000000..70a733d3d3da
--- /dev/null
+++ b/net/caif/cfcnfg.c
@@ -0,0 +1,529 @@
1/*
2 * Copyright (C) ST-Ericsson AB 2010
3 * Author: Sjur Brendeland/sjur.brandeland@stericsson.com
4 * License terms: GNU General Public License (GPL) version 2
5 */
6#include <linux/kernel.h>
7#include <linux/stddef.h>
8#include <net/caif/caif_layer.h>
9#include <net/caif/cfpkt.h>
10#include <net/caif/cfcnfg.h>
11#include <net/caif/cfctrl.h>
12#include <net/caif/cfmuxl.h>
13#include <net/caif/cffrml.h>
14#include <net/caif/cfserl.h>
15#include <net/caif/cfsrvl.h>
16
17#include <linux/module.h>
18#include <asm/atomic.h>
19
20#define MAX_PHY_LAYERS 7
21#define PHY_NAME_LEN 20
22
23#define container_obj(layr) container_of(layr, struct cfcnfg, layer)
24
25/* Information about CAIF physical interfaces held by Config Module in order
26 * to manage physical interfaces
27 */
28struct cfcnfg_phyinfo {
29 /* Pointer to the layer below the MUX (framing layer) */
30 struct cflayer *frm_layer;
31 /* Pointer to the lowest actual physical layer */
32 struct cflayer *phy_layer;
33 /* Unique identifier of the physical interface */
34 unsigned int id;
35 /* Preference of the physical in interface */
36 enum cfcnfg_phy_preference pref;
37
38 /* Reference count, number of channels using the device */
39 int phy_ref_count;
40
41 /* Information about the physical device */
42 struct dev_info dev_info;
43};
44
45struct cfcnfg {
46 struct cflayer layer;
47 struct cflayer *ctrl;
48 struct cflayer *mux;
49 u8 last_phyid;
50 struct cfcnfg_phyinfo phy_layers[MAX_PHY_LAYERS];
51};
52
53static void cncfg_linkup_rsp(struct cflayer *layer, u8 linkid,
54 enum cfctrl_srv serv, u8 phyid,
55 struct cflayer *adapt_layer);
56static void cncfg_linkdestroy_rsp(struct cflayer *layer, u8 linkid,
57 struct cflayer *client_layer);
58static void cncfg_reject_rsp(struct cflayer *layer, u8 linkid,
59 struct cflayer *adapt_layer);
60static void cfctrl_resp_func(void);
61static void cfctrl_enum_resp(void);
62
63struct cfcnfg *cfcnfg_create(void)
64{
65 struct cfcnfg *this;
66 struct cfctrl_rsp *resp;
67 /* Initiate this layer */
68 this = kmalloc(sizeof(struct cfcnfg), GFP_ATOMIC);
69 if (!this) {
70 pr_warning("CAIF: %s(): Out of memory\n", __func__);
71 return NULL;
72 }
73 memset(this, 0, sizeof(struct cfcnfg));
74 this->mux = cfmuxl_create();
75 if (!this->mux)
76 goto out_of_mem;
77 this->ctrl = cfctrl_create();
78 if (!this->ctrl)
79 goto out_of_mem;
80 /* Initiate response functions */
81 resp = cfctrl_get_respfuncs(this->ctrl);
82 resp->enum_rsp = cfctrl_enum_resp;
83 resp->linkerror_ind = cfctrl_resp_func;
84 resp->linkdestroy_rsp = cncfg_linkdestroy_rsp;
85 resp->sleep_rsp = cfctrl_resp_func;
86 resp->wake_rsp = cfctrl_resp_func;
87 resp->restart_rsp = cfctrl_resp_func;
88 resp->radioset_rsp = cfctrl_resp_func;
89 resp->linksetup_rsp = cncfg_linkup_rsp;
90 resp->reject_rsp = cncfg_reject_rsp;
91
92 this->last_phyid = 1;
93
94 cfmuxl_set_uplayer(this->mux, this->ctrl, 0);
95 layer_set_dn(this->ctrl, this->mux);
96 layer_set_up(this->ctrl, this);
97 return this;
98out_of_mem:
99 pr_warning("CAIF: %s(): Out of memory\n", __func__);
100 kfree(this->mux);
101 kfree(this->ctrl);
102 kfree(this);
103 return NULL;
104}
105EXPORT_SYMBOL(cfcnfg_create);
106
107void cfcnfg_remove(struct cfcnfg *cfg)
108{
109 if (cfg) {
110 kfree(cfg->mux);
111 kfree(cfg->ctrl);
112 kfree(cfg);
113 }
114}
115
116static void cfctrl_resp_func(void)
117{
118}
119
120static void cfctrl_enum_resp(void)
121{
122}
123
124struct dev_info *cfcnfg_get_phyid(struct cfcnfg *cnfg,
125 enum cfcnfg_phy_preference phy_pref)
126{
127 u16 i;
128
129 /* Try to match with specified preference */
130 for (i = 1; i < MAX_PHY_LAYERS; i++) {
131 if (cnfg->phy_layers[i].id == i &&
132 cnfg->phy_layers[i].pref == phy_pref &&
133 cnfg->phy_layers[i].frm_layer != NULL) {
134 caif_assert(cnfg->phy_layers != NULL);
135 caif_assert(cnfg->phy_layers[i].id == i);
136 return &cnfg->phy_layers[i].dev_info;
137 }
138 }
139 /* Otherwise just return something */
140 for (i = 1; i < MAX_PHY_LAYERS; i++) {
141 if (cnfg->phy_layers[i].id == i) {
142 caif_assert(cnfg->phy_layers != NULL);
143 caif_assert(cnfg->phy_layers[i].id == i);
144 return &cnfg->phy_layers[i].dev_info;
145 }
146 }
147
148 return NULL;
149}
150
151static struct cfcnfg_phyinfo *cfcnfg_get_phyinfo(struct cfcnfg *cnfg,
152 u8 phyid)
153{
154 int i;
155 /* Try to match with specified preference */
156 for (i = 0; i < MAX_PHY_LAYERS; i++)
157 if (cnfg->phy_layers[i].frm_layer != NULL &&
158 cnfg->phy_layers[i].id == phyid)
159 return &cnfg->phy_layers[i];
160 return NULL;
161}
162
163int cfcnfg_get_named(struct cfcnfg *cnfg, char *name)
164{
165 int i;
166
167 /* Try to match with specified name */
168 for (i = 0; i < MAX_PHY_LAYERS; i++) {
169 if (cnfg->phy_layers[i].frm_layer != NULL
170 && strcmp(cnfg->phy_layers[i].phy_layer->name,
171 name) == 0)
172 return cnfg->phy_layers[i].frm_layer->id;
173 }
174 return 0;
175}
176
177/*
178 * NOTE: What happens on destroy failure:
179 * 1a) No response - Too early
180 * This will not happen because enumerate has already
181 * completed.
182 * 1b) No response - FATAL
183 * Not handled, but this should be a CAIF PROTOCOL ERROR
184 * Modem error, response is really expected - this
185 * case is not really handled.
186 * 2) O/E-bit indicate error
187 * Ignored - this link is destroyed anyway.
188 * 3) Not able to match on request
189 * Not handled, but this should be a CAIF PROTOCOL ERROR
190 * 4) Link-Error - (no response)
191 * Not handled, but this should be a CAIF PROTOCOL ERROR
192 */
193
194int cfcnfg_del_adapt_layer(struct cfcnfg *cnfg, struct cflayer *adap_layer)
195{
196 u8 channel_id = 0;
197 int ret = 0;
198 struct cfcnfg_phyinfo *phyinfo = NULL;
199 u8 phyid = 0;
200
201 caif_assert(adap_layer != NULL);
202 channel_id = adap_layer->id;
203 if (channel_id == 0) {
204 pr_err("CAIF: %s():adap_layer->id is 0\n", __func__);
205 ret = -ENOTCONN;
206 goto end;
207 }
208
209 if (adap_layer->dn == NULL) {
210 pr_err("CAIF: %s():adap_layer->dn is NULL\n", __func__);
211 ret = -ENODEV;
212 goto end;
213 }
214
215 if (adap_layer->dn != NULL)
216 phyid = cfsrvl_getphyid(adap_layer->dn);
217
218 phyinfo = cfcnfg_get_phyinfo(cnfg, phyid);
219 if (phyinfo == NULL) {
220 pr_warning("CAIF: %s(): No interface to send disconnect to\n",
221 __func__);
222 ret = -ENODEV;
223 goto end;
224 }
225
226 if (phyinfo->id != phyid
227 || phyinfo->phy_layer->id != phyid
228 || phyinfo->frm_layer->id != phyid) {
229
230 pr_err("CAIF: %s(): Inconsistency in phy registration\n",
231 __func__);
232 ret = -EINVAL;
233 goto end;
234 }
235
236 ret = cfctrl_linkdown_req(cnfg->ctrl, channel_id, adap_layer);
237
238end:
239 if (phyinfo != NULL && --phyinfo->phy_ref_count == 0 &&
240 phyinfo->phy_layer != NULL &&
241 phyinfo->phy_layer->modemcmd != NULL) {
242 phyinfo->phy_layer->modemcmd(phyinfo->phy_layer,
243 _CAIF_MODEMCMD_PHYIF_USELESS);
244 }
245 return ret;
246
247}
248EXPORT_SYMBOL(cfcnfg_del_adapt_layer);
249
250static void cncfg_linkdestroy_rsp(struct cflayer *layer, u8 linkid,
251 struct cflayer *client_layer)
252{
253 struct cfcnfg *cnfg = container_obj(layer);
254 struct cflayer *servl;
255
256 /*
257 * 1) Remove service from the MUX layer. The MUX must
258 * guarante that no more payload sent "upwards" (receive)
259 */
260 servl = cfmuxl_remove_uplayer(cnfg->mux, linkid);
261
262 if (servl == NULL) {
263 pr_err("CAIF: %s(): PROTOCOL ERROR "
264 "- Error removing service_layer Linkid(%d)",
265 __func__, linkid);
266 return;
267 }
268 caif_assert(linkid == servl->id);
269
270 if (servl != client_layer && servl->up != client_layer) {
271 pr_err("CAIF: %s(): Error removing service_layer "
272 "Linkid(%d) %p %p",
273 __func__, linkid, (void *) servl,
274 (void *) client_layer);
275 return;
276 }
277
278 /*
279 * 2) DEINIT_RSP must guarantee that no more packets are transmitted
280 * from client (adap_layer) when it returns.
281 */
282
283 if (servl->ctrlcmd == NULL) {
284 pr_err("CAIF: %s(): Error servl->ctrlcmd == NULL", __func__);
285 return;
286 }
287
288 servl->ctrlcmd(servl, CAIF_CTRLCMD_DEINIT_RSP, 0);
289
290 /* 3) It is now safe to destroy the service layer. */
291 cfservl_destroy(servl);
292}
293
294/*
295 * NOTE: What happens on linksetup failure:
296 * 1a) No response - Too early
297 * This will not happen because enumerate is secured
298 * before using interface.
299 * 1b) No response - FATAL
300 * Not handled, but this should be a CAIF PROTOCOL ERROR
301 * Modem error, response is really expected - this case is
302 * not really handled.
303 * 2) O/E-bit indicate error
304 * Handled in cnfg_reject_rsp
305 * 3) Not able to match on request
306 * Not handled, but this should be a CAIF PROTOCOL ERROR
307 * 4) Link-Error - (no response)
308 * Not handled, but this should be a CAIF PROTOCOL ERROR
309 */
310
311int
312cfcnfg_add_adaptation_layer(struct cfcnfg *cnfg,
313 struct cfctrl_link_param *param,
314 struct cflayer *adap_layer)
315{
316 struct cflayer *frml;
317 if (adap_layer == NULL) {
318 pr_err("CAIF: %s(): adap_layer is zero", __func__);
319 return -EINVAL;
320 }
321 if (adap_layer->receive == NULL) {
322 pr_err("CAIF: %s(): adap_layer->receive is NULL", __func__);
323 return -EINVAL;
324 }
325 if (adap_layer->ctrlcmd == NULL) {
326 pr_err("CAIF: %s(): adap_layer->ctrlcmd == NULL", __func__);
327 return -EINVAL;
328 }
329 frml = cnfg->phy_layers[param->phyid].frm_layer;
330 if (frml == NULL) {
331 pr_err("CAIF: %s(): Specified PHY type does not exist!",
332 __func__);
333 return -ENODEV;
334 }
335 caif_assert(param->phyid == cnfg->phy_layers[param->phyid].id);
336 caif_assert(cnfg->phy_layers[param->phyid].frm_layer->id ==
337 param->phyid);
338 caif_assert(cnfg->phy_layers[param->phyid].phy_layer->id ==
339 param->phyid);
340 /* FIXME: ENUMERATE INITIALLY WHEN ACTIVATING PHYSICAL INTERFACE */
341 cfctrl_enum_req(cnfg->ctrl, param->phyid);
342 cfctrl_linkup_request(cnfg->ctrl, param, adap_layer);
343 return 0;
344}
345EXPORT_SYMBOL(cfcnfg_add_adaptation_layer);
346
347static void cncfg_reject_rsp(struct cflayer *layer, u8 linkid,
348 struct cflayer *adapt_layer)
349{
350 if (adapt_layer != NULL && adapt_layer->ctrlcmd != NULL)
351 adapt_layer->ctrlcmd(adapt_layer,
352 CAIF_CTRLCMD_INIT_FAIL_RSP, 0);
353}
354
355static void
356cncfg_linkup_rsp(struct cflayer *layer, u8 linkid, enum cfctrl_srv serv,
357 u8 phyid, struct cflayer *adapt_layer)
358{
359 struct cfcnfg *cnfg = container_obj(layer);
360 struct cflayer *servicel = NULL;
361 struct cfcnfg_phyinfo *phyinfo;
362 if (adapt_layer == NULL) {
363 pr_err("CAIF: %s(): PROTOCOL ERROR "
364 "- LinkUp Request/Response did not match\n", __func__);
365 return;
366 }
367
368 caif_assert(cnfg != NULL);
369 caif_assert(phyid != 0);
370 phyinfo = &cnfg->phy_layers[phyid];
371 caif_assert(phyinfo != NULL);
372 caif_assert(phyinfo->id == phyid);
373 caif_assert(phyinfo->phy_layer != NULL);
374 caif_assert(phyinfo->phy_layer->id == phyid);
375
376 if (phyinfo != NULL &&
377 phyinfo->phy_ref_count++ == 0 &&
378 phyinfo->phy_layer != NULL &&
379 phyinfo->phy_layer->modemcmd != NULL) {
380 caif_assert(phyinfo->phy_layer->id == phyid);
381 phyinfo->phy_layer->modemcmd(phyinfo->phy_layer,
382 _CAIF_MODEMCMD_PHYIF_USEFULL);
383
384 }
385 adapt_layer->id = linkid;
386
387 switch (serv) {
388 case CFCTRL_SRV_VEI:
389 servicel = cfvei_create(linkid, &phyinfo->dev_info);
390 break;
391 case CFCTRL_SRV_DATAGRAM:
392 servicel = cfdgml_create(linkid, &phyinfo->dev_info);
393 break;
394 case CFCTRL_SRV_RFM:
395 servicel = cfrfml_create(linkid, &phyinfo->dev_info);
396 break;
397 case CFCTRL_SRV_UTIL:
398 servicel = cfutill_create(linkid, &phyinfo->dev_info);
399 break;
400 case CFCTRL_SRV_VIDEO:
401 servicel = cfvidl_create(linkid, &phyinfo->dev_info);
402 break;
403 case CFCTRL_SRV_DBG:
404 servicel = cfdbgl_create(linkid, &phyinfo->dev_info);
405 break;
406 default:
407 pr_err("CAIF: %s(): Protocol error. "
408 "Link setup response - unknown channel type\n",
409 __func__);
410 return;
411 }
412 if (!servicel) {
413 pr_warning("CAIF: %s(): Out of memory\n", __func__);
414 return;
415 }
416 layer_set_dn(servicel, cnfg->mux);
417 cfmuxl_set_uplayer(cnfg->mux, servicel, linkid);
418 layer_set_up(servicel, adapt_layer);
419 layer_set_dn(adapt_layer, servicel);
420 servicel->ctrlcmd(servicel, CAIF_CTRLCMD_INIT_RSP, 0);
421}
422
423void
424cfcnfg_add_phy_layer(struct cfcnfg *cnfg, enum cfcnfg_phy_type phy_type,
425 void *dev, struct cflayer *phy_layer, u16 *phyid,
426 enum cfcnfg_phy_preference pref,
427 bool fcs, bool stx)
428{
429 struct cflayer *frml;
430 struct cflayer *phy_driver = NULL;
431 int i;
432
433
434 if (cnfg->phy_layers[cnfg->last_phyid].frm_layer == NULL) {
435 *phyid = cnfg->last_phyid;
436
437 /* range: * 1..(MAX_PHY_LAYERS-1) */
438 cnfg->last_phyid =
439 (cnfg->last_phyid % (MAX_PHY_LAYERS - 1)) + 1;
440 } else {
441 *phyid = 0;
442 for (i = 1; i < MAX_PHY_LAYERS; i++) {
443 if (cnfg->phy_layers[i].frm_layer == NULL) {
444 *phyid = i;
445 break;
446 }
447 }
448 }
449 if (*phyid == 0) {
450 pr_err("CAIF: %s(): No Available PHY ID\n", __func__);
451 return;
452 }
453
454 switch (phy_type) {
455 case CFPHYTYPE_FRAG:
456 phy_driver =
457 cfserl_create(CFPHYTYPE_FRAG, *phyid, stx);
458 if (!phy_driver) {
459 pr_warning("CAIF: %s(): Out of memory\n", __func__);
460 return;
461 }
462
463 break;
464 case CFPHYTYPE_CAIF:
465 phy_driver = NULL;
466 break;
467 default:
468 pr_err("CAIF: %s(): %d", __func__, phy_type);
469 return;
470 break;
471 }
472
473 phy_layer->id = *phyid;
474 cnfg->phy_layers[*phyid].pref = pref;
475 cnfg->phy_layers[*phyid].id = *phyid;
476 cnfg->phy_layers[*phyid].dev_info.id = *phyid;
477 cnfg->phy_layers[*phyid].dev_info.dev = dev;
478 cnfg->phy_layers[*phyid].phy_layer = phy_layer;
479 cnfg->phy_layers[*phyid].phy_ref_count = 0;
480 phy_layer->type = phy_type;
481 frml = cffrml_create(*phyid, fcs);
482 if (!frml) {
483 pr_warning("CAIF: %s(): Out of memory\n", __func__);
484 return;
485 }
486 cnfg->phy_layers[*phyid].frm_layer = frml;
487 cfmuxl_set_dnlayer(cnfg->mux, frml, *phyid);
488 layer_set_up(frml, cnfg->mux);
489
490 if (phy_driver != NULL) {
491 phy_driver->id = *phyid;
492 layer_set_dn(frml, phy_driver);
493 layer_set_up(phy_driver, frml);
494 layer_set_dn(phy_driver, phy_layer);
495 layer_set_up(phy_layer, phy_driver);
496 } else {
497 layer_set_dn(frml, phy_layer);
498 layer_set_up(phy_layer, frml);
499 }
500}
501EXPORT_SYMBOL(cfcnfg_add_phy_layer);
502
503int cfcnfg_del_phy_layer(struct cfcnfg *cnfg, struct cflayer *phy_layer)
504{
505 struct cflayer *frml, *frml_dn;
506 u16 phyid;
507 phyid = phy_layer->id;
508 caif_assert(phyid == cnfg->phy_layers[phyid].id);
509 caif_assert(phy_layer == cnfg->phy_layers[phyid].phy_layer);
510 caif_assert(phy_layer->id == phyid);
511 caif_assert(cnfg->phy_layers[phyid].frm_layer->id == phyid);
512
513 memset(&cnfg->phy_layers[phy_layer->id], 0,
514 sizeof(struct cfcnfg_phyinfo));
515 frml = cfmuxl_remove_dnlayer(cnfg->mux, phy_layer->id);
516 frml_dn = frml->dn;
517 cffrml_set_uplayer(frml, NULL);
518 cffrml_set_dnlayer(frml, NULL);
519 kfree(frml);
520
521 if (phy_layer != frml_dn) {
522 layer_set_up(frml_dn, NULL);
523 layer_set_dn(frml_dn, NULL);
524 kfree(frml_dn);
525 }
526 layer_set_up(phy_layer, NULL);
527 return 0;
528}
529EXPORT_SYMBOL(cfcnfg_del_phy_layer);
diff --git a/net/caif/cfpkt_skbuff.c b/net/caif/cfpkt_skbuff.c
new file mode 100644
index 000000000000..83fff2ff6658
--- /dev/null
+++ b/net/caif/cfpkt_skbuff.c
@@ -0,0 +1,571 @@
1/*
2 * Copyright (C) ST-Ericsson AB 2010
3 * Author: Sjur Brendeland/sjur.brandeland@stericsson.com
4 * License terms: GNU General Public License (GPL) version 2
5 */
6
7#include <linux/string.h>
8#include <linux/skbuff.h>
9#include <linux/hardirq.h>
10#include <net/caif/cfpkt.h>
11
12#define PKT_PREFIX CAIF_NEEDED_HEADROOM
13#define PKT_POSTFIX CAIF_NEEDED_TAILROOM
14#define PKT_LEN_WHEN_EXTENDING 128
15#define PKT_ERROR(pkt, errmsg) do { \
16 cfpkt_priv(pkt)->erronous = true; \
17 skb_reset_tail_pointer(&pkt->skb); \
18 pr_warning("CAIF: " errmsg);\
19 } while (0)
20
21struct cfpktq {
22 struct sk_buff_head head;
23 atomic_t count;
24 /* Lock protects count updates */
25 spinlock_t lock;
26};
27
28/*
29 * net/caif/ is generic and does not
30 * understand SKB, so we do this typecast
31 */
32struct cfpkt {
33 struct sk_buff skb;
34};
35
36/* Private data inside SKB */
37struct cfpkt_priv_data {
38 struct dev_info dev_info;
39 bool erronous;
40};
41
42inline struct cfpkt_priv_data *cfpkt_priv(struct cfpkt *pkt)
43{
44 return (struct cfpkt_priv_data *) pkt->skb.cb;
45}
46
47inline bool is_erronous(struct cfpkt *pkt)
48{
49 return cfpkt_priv(pkt)->erronous;
50}
51
52inline struct sk_buff *pkt_to_skb(struct cfpkt *pkt)
53{
54 return &pkt->skb;
55}
56
57inline struct cfpkt *skb_to_pkt(struct sk_buff *skb)
58{
59 return (struct cfpkt *) skb;
60}
61
62
63struct cfpkt *cfpkt_fromnative(enum caif_direction dir, void *nativepkt)
64{
65 struct cfpkt *pkt = skb_to_pkt(nativepkt);
66 cfpkt_priv(pkt)->erronous = false;
67 return pkt;
68}
69EXPORT_SYMBOL(cfpkt_fromnative);
70
71void *cfpkt_tonative(struct cfpkt *pkt)
72{
73 return (void *) pkt;
74}
75EXPORT_SYMBOL(cfpkt_tonative);
76
77static struct cfpkt *cfpkt_create_pfx(u16 len, u16 pfx)
78{
79 struct sk_buff *skb;
80
81 if (likely(in_interrupt()))
82 skb = alloc_skb(len + pfx, GFP_ATOMIC);
83 else
84 skb = alloc_skb(len + pfx, GFP_KERNEL);
85
86 if (unlikely(skb == NULL))
87 return NULL;
88
89 skb_reserve(skb, pfx);
90 return skb_to_pkt(skb);
91}
92
93inline struct cfpkt *cfpkt_create(u16 len)
94{
95 return cfpkt_create_pfx(len + PKT_POSTFIX, PKT_PREFIX);
96}
97EXPORT_SYMBOL(cfpkt_create);
98
99void cfpkt_destroy(struct cfpkt *pkt)
100{
101 struct sk_buff *skb = pkt_to_skb(pkt);
102 kfree_skb(skb);
103}
104EXPORT_SYMBOL(cfpkt_destroy);
105
106inline bool cfpkt_more(struct cfpkt *pkt)
107{
108 struct sk_buff *skb = pkt_to_skb(pkt);
109 return skb->len > 0;
110}
111EXPORT_SYMBOL(cfpkt_more);
112
113int cfpkt_peek_head(struct cfpkt *pkt, void *data, u16 len)
114{
115 struct sk_buff *skb = pkt_to_skb(pkt);
116 if (skb_headlen(skb) >= len) {
117 memcpy(data, skb->data, len);
118 return 0;
119 }
120 return !cfpkt_extr_head(pkt, data, len) &&
121 !cfpkt_add_head(pkt, data, len);
122}
123EXPORT_SYMBOL(cfpkt_peek_head);
124
125int cfpkt_extr_head(struct cfpkt *pkt, void *data, u16 len)
126{
127 struct sk_buff *skb = pkt_to_skb(pkt);
128 u8 *from;
129 if (unlikely(is_erronous(pkt)))
130 return -EPROTO;
131
132 if (unlikely(len > skb->len)) {
133 PKT_ERROR(pkt, "cfpkt_extr_head read beyond end of packet\n");
134 return -EPROTO;
135 }
136
137 if (unlikely(len > skb_headlen(skb))) {
138 if (unlikely(skb_linearize(skb) != 0)) {
139 PKT_ERROR(pkt, "cfpkt_extr_head linearize failed\n");
140 return -EPROTO;
141 }
142 }
143 from = skb_pull(skb, len);
144 from -= len;
145 memcpy(data, from, len);
146 return 0;
147}
148EXPORT_SYMBOL(cfpkt_extr_head);
149
150int cfpkt_extr_trail(struct cfpkt *pkt, void *dta, u16 len)
151{
152 struct sk_buff *skb = pkt_to_skb(pkt);
153 u8 *data = dta;
154 u8 *from;
155 if (unlikely(is_erronous(pkt)))
156 return -EPROTO;
157
158 if (unlikely(skb_linearize(skb) != 0)) {
159 PKT_ERROR(pkt, "cfpkt_extr_trail linearize failed\n");
160 return -EPROTO;
161 }
162 if (unlikely(skb->data + len > skb_tail_pointer(skb))) {
163 PKT_ERROR(pkt, "cfpkt_extr_trail read beyond end of packet\n");
164 return -EPROTO;
165 }
166 from = skb_tail_pointer(skb) - len;
167 skb_trim(skb, skb->len - len);
168 memcpy(data, from, len);
169 return 0;
170}
171EXPORT_SYMBOL(cfpkt_extr_trail);
172
173int cfpkt_pad_trail(struct cfpkt *pkt, u16 len)
174{
175 return cfpkt_add_body(pkt, NULL, len);
176}
177EXPORT_SYMBOL(cfpkt_pad_trail);
178
179int cfpkt_add_body(struct cfpkt *pkt, const void *data, u16 len)
180{
181 struct sk_buff *skb = pkt_to_skb(pkt);
182 struct sk_buff *lastskb;
183 u8 *to;
184 u16 addlen = 0;
185
186
187 if (unlikely(is_erronous(pkt)))
188 return -EPROTO;
189
190 lastskb = skb;
191
192 /* Check whether we need to add space at the tail */
193 if (unlikely(skb_tailroom(skb) < len)) {
194 if (likely(len < PKT_LEN_WHEN_EXTENDING))
195 addlen = PKT_LEN_WHEN_EXTENDING;
196 else
197 addlen = len;
198 }
199
200 /* Check whether we need to change the SKB before writing to the tail */
201 if (unlikely((addlen > 0) || skb_cloned(skb) || skb_shared(skb))) {
202
203 /* Make sure data is writable */
204 if (unlikely(skb_cow_data(skb, addlen, &lastskb) < 0)) {
205 PKT_ERROR(pkt, "cfpkt_add_body: cow failed\n");
206 return -EPROTO;
207 }
208 /*
209 * Is the SKB non-linear after skb_cow_data()? If so, we are
210 * going to add data to the last SKB, so we need to adjust
211 * lengths of the top SKB.
212 */
213 if (lastskb != skb) {
214 pr_warning("CAIF: %s(): Packet is non-linear\n",
215 __func__);
216 skb->len += len;
217 skb->data_len += len;
218 }
219 }
220
221 /* All set to put the last SKB and optionally write data there. */
222 to = skb_put(lastskb, len);
223 if (likely(data))
224 memcpy(to, data, len);
225 return 0;
226}
227EXPORT_SYMBOL(cfpkt_add_body);
228
229inline int cfpkt_addbdy(struct cfpkt *pkt, u8 data)
230{
231 return cfpkt_add_body(pkt, &data, 1);
232}
233EXPORT_SYMBOL(cfpkt_addbdy);
234
235int cfpkt_add_head(struct cfpkt *pkt, const void *data2, u16 len)
236{
237 struct sk_buff *skb = pkt_to_skb(pkt);
238 struct sk_buff *lastskb;
239 u8 *to;
240 const u8 *data = data2;
241 if (unlikely(is_erronous(pkt)))
242 return -EPROTO;
243 if (unlikely(skb_headroom(skb) < len)) {
244 PKT_ERROR(pkt, "cfpkt_add_head: no headroom\n");
245 return -EPROTO;
246 }
247
248 /* Make sure data is writable */
249 if (unlikely(skb_cow_data(skb, 0, &lastskb) < 0)) {
250 PKT_ERROR(pkt, "cfpkt_add_head: cow failed\n");
251 return -EPROTO;
252 }
253
254 to = skb_push(skb, len);
255 memcpy(to, data, len);
256 return 0;
257}
258EXPORT_SYMBOL(cfpkt_add_head);
259
260inline int cfpkt_add_trail(struct cfpkt *pkt, const void *data, u16 len)
261{
262 return cfpkt_add_body(pkt, data, len);
263}
264EXPORT_SYMBOL(cfpkt_add_trail);
265
266inline u16 cfpkt_getlen(struct cfpkt *pkt)
267{
268 struct sk_buff *skb = pkt_to_skb(pkt);
269 return skb->len;
270}
271EXPORT_SYMBOL(cfpkt_getlen);
272
273inline u16 cfpkt_iterate(struct cfpkt *pkt,
274 u16 (*iter_func)(u16, void *, u16),
275 u16 data)
276{
277 /*
278 * Don't care about the performance hit of linearizing,
279 * Checksum should not be used on high-speed interfaces anyway.
280 */
281 if (unlikely(is_erronous(pkt)))
282 return -EPROTO;
283 if (unlikely(skb_linearize(&pkt->skb) != 0)) {
284 PKT_ERROR(pkt, "cfpkt_iterate: linearize failed\n");
285 return -EPROTO;
286 }
287 return iter_func(data, pkt->skb.data, cfpkt_getlen(pkt));
288}
289EXPORT_SYMBOL(cfpkt_iterate);
290
291int cfpkt_setlen(struct cfpkt *pkt, u16 len)
292{
293 struct sk_buff *skb = pkt_to_skb(pkt);
294
295
296 if (unlikely(is_erronous(pkt)))
297 return -EPROTO;
298
299 if (likely(len <= skb->len)) {
300 if (unlikely(skb->data_len))
301 ___pskb_trim(skb, len);
302 else
303 skb_trim(skb, len);
304
305 return cfpkt_getlen(pkt);
306 }
307
308 /* Need to expand SKB */
309 if (unlikely(!cfpkt_pad_trail(pkt, len - skb->len)))
310 PKT_ERROR(pkt, "cfpkt_setlen: skb_pad_trail failed\n");
311
312 return cfpkt_getlen(pkt);
313}
314EXPORT_SYMBOL(cfpkt_setlen);
315
316struct cfpkt *cfpkt_create_uplink(const unsigned char *data, unsigned int len)
317{
318 struct cfpkt *pkt = cfpkt_create_pfx(len + PKT_POSTFIX, PKT_PREFIX);
319 if (unlikely(data != NULL))
320 cfpkt_add_body(pkt, data, len);
321 return pkt;
322}
323EXPORT_SYMBOL(cfpkt_create_uplink);
324
325struct cfpkt *cfpkt_append(struct cfpkt *dstpkt,
326 struct cfpkt *addpkt,
327 u16 expectlen)
328{
329 struct sk_buff *dst = pkt_to_skb(dstpkt);
330 struct sk_buff *add = pkt_to_skb(addpkt);
331 u16 addlen = skb_headlen(add);
332 u16 neededtailspace;
333 struct sk_buff *tmp;
334 u16 dstlen;
335 u16 createlen;
336 if (unlikely(is_erronous(dstpkt) || is_erronous(addpkt))) {
337 cfpkt_destroy(addpkt);
338 return dstpkt;
339 }
340 if (expectlen > addlen)
341 neededtailspace = expectlen;
342 else
343 neededtailspace = addlen;
344
345 if (dst->tail + neededtailspace > dst->end) {
346 /* Create a dumplicate of 'dst' with more tail space */
347 dstlen = skb_headlen(dst);
348 createlen = dstlen + neededtailspace;
349 tmp = pkt_to_skb(
350 cfpkt_create(createlen + PKT_PREFIX + PKT_POSTFIX));
351 if (!tmp)
352 return NULL;
353 skb_set_tail_pointer(tmp, dstlen);
354 tmp->len = dstlen;
355 memcpy(tmp->data, dst->data, dstlen);
356 cfpkt_destroy(dstpkt);
357 dst = tmp;
358 }
359 memcpy(skb_tail_pointer(dst), add->data, skb_headlen(add));
360 cfpkt_destroy(addpkt);
361 dst->tail += addlen;
362 dst->len += addlen;
363 return skb_to_pkt(dst);
364}
365EXPORT_SYMBOL(cfpkt_append);
366
367struct cfpkt *cfpkt_split(struct cfpkt *pkt, u16 pos)
368{
369 struct sk_buff *skb2;
370 struct sk_buff *skb = pkt_to_skb(pkt);
371 u8 *split = skb->data + pos;
372 u16 len2nd = skb_tail_pointer(skb) - split;
373
374 if (unlikely(is_erronous(pkt)))
375 return NULL;
376
377 if (skb->data + pos > skb_tail_pointer(skb)) {
378 PKT_ERROR(pkt,
379 "cfpkt_split: trying to split beyond end of packet");
380 return NULL;
381 }
382
383 /* Create a new packet for the second part of the data */
384 skb2 = pkt_to_skb(
385 cfpkt_create_pfx(len2nd + PKT_PREFIX + PKT_POSTFIX,
386 PKT_PREFIX));
387
388 if (skb2 == NULL)
389 return NULL;
390
391 /* Reduce the length of the original packet */
392 skb_set_tail_pointer(skb, pos);
393 skb->len = pos;
394
395 memcpy(skb2->data, split, len2nd);
396 skb2->tail += len2nd;
397 skb2->len += len2nd;
398 return skb_to_pkt(skb2);
399}
400EXPORT_SYMBOL(cfpkt_split);
401
402char *cfpkt_log_pkt(struct cfpkt *pkt, char *buf, int buflen)
403{
404 struct sk_buff *skb = pkt_to_skb(pkt);
405 char *p = buf;
406 int i;
407
408 /*
409 * Sanity check buffer length, it needs to be at least as large as
410 * the header info: ~=50+ bytes
411 */
412 if (buflen < 50)
413 return NULL;
414
415 snprintf(buf, buflen, "%s: pkt:%p len:%ld(%ld+%ld) {%ld,%ld} data: [",
416 is_erronous(pkt) ? "ERRONOUS-SKB" :
417 (skb->data_len != 0 ? "COMPLEX-SKB" : "SKB"),
418 skb,
419 (long) skb->len,
420 (long) (skb_tail_pointer(skb) - skb->data),
421 (long) skb->data_len,
422 (long) (skb->data - skb->head),
423 (long) (skb_tail_pointer(skb) - skb->head));
424 p = buf + strlen(buf);
425
426 for (i = 0; i < skb_tail_pointer(skb) - skb->data && i < 300; i++) {
427 if (p > buf + buflen - 10) {
428 sprintf(p, "...");
429 p = buf + strlen(buf);
430 break;
431 }
432 sprintf(p, "%02x,", skb->data[i]);
433 p = buf + strlen(buf);
434 }
435 sprintf(p, "]\n");
436 return buf;
437}
438EXPORT_SYMBOL(cfpkt_log_pkt);
439
440int cfpkt_raw_append(struct cfpkt *pkt, void **buf, unsigned int buflen)
441{
442 struct sk_buff *skb = pkt_to_skb(pkt);
443 struct sk_buff *lastskb;
444
445 caif_assert(buf != NULL);
446 if (unlikely(is_erronous(pkt)))
447 return -EPROTO;
448 /* Make sure SKB is writable */
449 if (unlikely(skb_cow_data(skb, 0, &lastskb) < 0)) {
450 PKT_ERROR(pkt, "cfpkt_raw_append: skb_cow_data failed\n");
451 return -EPROTO;
452 }
453
454 if (unlikely(skb_linearize(skb) != 0)) {
455 PKT_ERROR(pkt, "cfpkt_raw_append: linearize failed\n");
456 return -EPROTO;
457 }
458
459 if (unlikely(skb_tailroom(skb) < buflen)) {
460 PKT_ERROR(pkt, "cfpkt_raw_append: buffer too short - failed\n");
461 return -EPROTO;
462 }
463
464 *buf = skb_put(skb, buflen);
465 return 1;
466}
467EXPORT_SYMBOL(cfpkt_raw_append);
468
469int cfpkt_raw_extract(struct cfpkt *pkt, void **buf, unsigned int buflen)
470{
471 struct sk_buff *skb = pkt_to_skb(pkt);
472
473 caif_assert(buf != NULL);
474 if (unlikely(is_erronous(pkt)))
475 return -EPROTO;
476
477 if (unlikely(buflen > skb->len)) {
478 PKT_ERROR(pkt, "cfpkt_raw_extract: buflen too large "
479 "- failed\n");
480 return -EPROTO;
481 }
482
483 if (unlikely(buflen > skb_headlen(skb))) {
484 if (unlikely(skb_linearize(skb) != 0)) {
485 PKT_ERROR(pkt, "cfpkt_raw_extract: linearize failed\n");
486 return -EPROTO;
487 }
488 }
489
490 *buf = skb->data;
491 skb_pull(skb, buflen);
492
493 return 1;
494}
495EXPORT_SYMBOL(cfpkt_raw_extract);
496
497inline bool cfpkt_erroneous(struct cfpkt *pkt)
498{
499 return cfpkt_priv(pkt)->erronous;
500}
501EXPORT_SYMBOL(cfpkt_erroneous);
502
503struct cfpktq *cfpktq_create(void)
504{
505 struct cfpktq *q = kmalloc(sizeof(struct cfpktq), GFP_ATOMIC);
506 if (!q)
507 return NULL;
508 skb_queue_head_init(&q->head);
509 atomic_set(&q->count, 0);
510 spin_lock_init(&q->lock);
511 return q;
512}
513EXPORT_SYMBOL(cfpktq_create);
514
515void cfpkt_queue(struct cfpktq *pktq, struct cfpkt *pkt, unsigned short prio)
516{
517 atomic_inc(&pktq->count);
518 spin_lock(&pktq->lock);
519 skb_queue_tail(&pktq->head, pkt_to_skb(pkt));
520 spin_unlock(&pktq->lock);
521
522}
523EXPORT_SYMBOL(cfpkt_queue);
524
525struct cfpkt *cfpkt_qpeek(struct cfpktq *pktq)
526{
527 struct cfpkt *tmp;
528 spin_lock(&pktq->lock);
529 tmp = skb_to_pkt(skb_peek(&pktq->head));
530 spin_unlock(&pktq->lock);
531 return tmp;
532}
533EXPORT_SYMBOL(cfpkt_qpeek);
534
535struct cfpkt *cfpkt_dequeue(struct cfpktq *pktq)
536{
537 struct cfpkt *pkt;
538 spin_lock(&pktq->lock);
539 pkt = skb_to_pkt(skb_dequeue(&pktq->head));
540 if (pkt) {
541 atomic_dec(&pktq->count);
542 caif_assert(atomic_read(&pktq->count) >= 0);
543 }
544 spin_unlock(&pktq->lock);
545 return pkt;
546}
547EXPORT_SYMBOL(cfpkt_dequeue);
548
549int cfpkt_qcount(struct cfpktq *pktq)
550{
551 return atomic_read(&pktq->count);
552}
553EXPORT_SYMBOL(cfpkt_qcount);
554
555struct cfpkt *cfpkt_clone_release(struct cfpkt *pkt)
556{
557 struct cfpkt *clone;
558 clone = skb_to_pkt(skb_clone(pkt_to_skb(pkt), GFP_ATOMIC));
559 /* Free original packet. */
560 cfpkt_destroy(pkt);
561 if (!clone)
562 return NULL;
563 return clone;
564}
565EXPORT_SYMBOL(cfpkt_clone_release);
566
567struct caif_payload_info *cfpkt_info(struct cfpkt *pkt)
568{
569 return (struct caif_payload_info *)&pkt_to_skb(pkt)->cb;
570}
571EXPORT_SYMBOL(cfpkt_info);
generated by cgit v1.2.2 (git 2.25.0) at 2024-09-24 15:19:32 -0400