Commit 15c9ac0c authored by Sjur Braendeland's avatar Sjur Braendeland Committed by David S. Miller

net-caif: add CAIF generic caif support functions

Support functions for the caif protocol stack:
cfcnfg.c        - CAIF Configuration Module used for
                  adding and removing drivers and connection
cfpkt_skbuff.c  - CAIF Packet layer (SKB helper functions)
Signed-off-by: default avatarSjur Braendeland <sjur.brandeland@stericsson.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent b482cd20
/*
* Copyright (C) ST-Ericsson AB 2010
* Author: Sjur Brendeland/sjur.brandeland@stericsson.com
* License terms: GNU General Public License (GPL) version 2
*/
#include <linux/kernel.h>
#include <linux/stddef.h>
#include <net/caif/caif_layer.h>
#include <net/caif/cfpkt.h>
#include <net/caif/cfcnfg.h>
#include <net/caif/cfctrl.h>
#include <net/caif/cfmuxl.h>
#include <net/caif/cffrml.h>
#include <net/caif/cfserl.h>
#include <net/caif/cfsrvl.h>
#include <linux/module.h>
#include <asm/atomic.h>
#define MAX_PHY_LAYERS 7
#define PHY_NAME_LEN 20
#define container_obj(layr) container_of(layr, struct cfcnfg, layer)
/* Information about CAIF physical interfaces held by Config Module in order
* to manage physical interfaces
*/
struct cfcnfg_phyinfo {
/* Pointer to the layer below the MUX (framing layer) */
struct cflayer *frm_layer;
/* Pointer to the lowest actual physical layer */
struct cflayer *phy_layer;
/* Unique identifier of the physical interface */
unsigned int id;
/* Preference of the physical in interface */
enum cfcnfg_phy_preference pref;
/* Reference count, number of channels using the device */
int phy_ref_count;
/* Information about the physical device */
struct dev_info dev_info;
};
struct cfcnfg {
struct cflayer layer;
struct cflayer *ctrl;
struct cflayer *mux;
u8 last_phyid;
struct cfcnfg_phyinfo phy_layers[MAX_PHY_LAYERS];
};
static void cncfg_linkup_rsp(struct cflayer *layer, u8 linkid,
enum cfctrl_srv serv, u8 phyid,
struct cflayer *adapt_layer);
static void cncfg_linkdestroy_rsp(struct cflayer *layer, u8 linkid,
struct cflayer *client_layer);
static void cncfg_reject_rsp(struct cflayer *layer, u8 linkid,
struct cflayer *adapt_layer);
static void cfctrl_resp_func(void);
static void cfctrl_enum_resp(void);
struct cfcnfg *cfcnfg_create(void)
{
struct cfcnfg *this;
struct cfctrl_rsp *resp;
/* Initiate this layer */
this = kmalloc(sizeof(struct cfcnfg), GFP_ATOMIC);
if (!this) {
pr_warning("CAIF: %s(): Out of memory\n", __func__);
return NULL;
}
memset(this, 0, sizeof(struct cfcnfg));
this->mux = cfmuxl_create();
if (!this->mux)
goto out_of_mem;
this->ctrl = cfctrl_create();
if (!this->ctrl)
goto out_of_mem;
/* Initiate response functions */
resp = cfctrl_get_respfuncs(this->ctrl);
resp->enum_rsp = cfctrl_enum_resp;
resp->linkerror_ind = cfctrl_resp_func;
resp->linkdestroy_rsp = cncfg_linkdestroy_rsp;
resp->sleep_rsp = cfctrl_resp_func;
resp->wake_rsp = cfctrl_resp_func;
resp->restart_rsp = cfctrl_resp_func;
resp->radioset_rsp = cfctrl_resp_func;
resp->linksetup_rsp = cncfg_linkup_rsp;
resp->reject_rsp = cncfg_reject_rsp;
this->last_phyid = 1;
cfmuxl_set_uplayer(this->mux, this->ctrl, 0);
layer_set_dn(this->ctrl, this->mux);
layer_set_up(this->ctrl, this);
return this;
out_of_mem:
pr_warning("CAIF: %s(): Out of memory\n", __func__);
kfree(this->mux);
kfree(this->ctrl);
kfree(this);
return NULL;
}
EXPORT_SYMBOL(cfcnfg_create);
void cfcnfg_remove(struct cfcnfg *cfg)
{
if (cfg) {
kfree(cfg->mux);
kfree(cfg->ctrl);
kfree(cfg);
}
}
static void cfctrl_resp_func(void)
{
}
static void cfctrl_enum_resp(void)
{
}
struct dev_info *cfcnfg_get_phyid(struct cfcnfg *cnfg,
enum cfcnfg_phy_preference phy_pref)
{
u16 i;
/* Try to match with specified preference */
for (i = 1; i < MAX_PHY_LAYERS; i++) {
if (cnfg->phy_layers[i].id == i &&
cnfg->phy_layers[i].pref == phy_pref &&
cnfg->phy_layers[i].frm_layer != NULL) {
caif_assert(cnfg->phy_layers != NULL);
caif_assert(cnfg->phy_layers[i].id == i);
return &cnfg->phy_layers[i].dev_info;
}
}
/* Otherwise just return something */
for (i = 1; i < MAX_PHY_LAYERS; i++) {
if (cnfg->phy_layers[i].id == i) {
caif_assert(cnfg->phy_layers != NULL);
caif_assert(cnfg->phy_layers[i].id == i);
return &cnfg->phy_layers[i].dev_info;
}
}
return NULL;
}
static struct cfcnfg_phyinfo *cfcnfg_get_phyinfo(struct cfcnfg *cnfg,
u8 phyid)
{
int i;
/* Try to match with specified preference */
for (i = 0; i < MAX_PHY_LAYERS; i++)
if (cnfg->phy_layers[i].frm_layer != NULL &&
cnfg->phy_layers[i].id == phyid)
return &cnfg->phy_layers[i];
return NULL;
}
int cfcnfg_get_named(struct cfcnfg *cnfg, char *name)
{
int i;
/* Try to match with specified name */
for (i = 0; i < MAX_PHY_LAYERS; i++) {
if (cnfg->phy_layers[i].frm_layer != NULL
&& strcmp(cnfg->phy_layers[i].phy_layer->name,
name) == 0)
return cnfg->phy_layers[i].frm_layer->id;
}
return 0;
}
/*
* NOTE: What happens on destroy failure:
* 1a) No response - Too early
* This will not happen because enumerate has already
* completed.
* 1b) No response - FATAL
* Not handled, but this should be a CAIF PROTOCOL ERROR
* Modem error, response is really expected - this
* case is not really handled.
* 2) O/E-bit indicate error
* Ignored - this link is destroyed anyway.
* 3) Not able to match on request
* Not handled, but this should be a CAIF PROTOCOL ERROR
* 4) Link-Error - (no response)
* Not handled, but this should be a CAIF PROTOCOL ERROR
*/
int cfcnfg_del_adapt_layer(struct cfcnfg *cnfg, struct cflayer *adap_layer)
{
u8 channel_id = 0;
int ret = 0;
struct cfcnfg_phyinfo *phyinfo = NULL;
u8 phyid = 0;
caif_assert(adap_layer != NULL);
channel_id = adap_layer->id;
if (channel_id == 0) {
pr_err("CAIF: %s():adap_layer->id is 0\n", __func__);
ret = -ENOTCONN;
goto end;
}
if (adap_layer->dn == NULL) {
pr_err("CAIF: %s():adap_layer->dn is NULL\n", __func__);
ret = -ENODEV;
goto end;
}
if (adap_layer->dn != NULL)
phyid = cfsrvl_getphyid(adap_layer->dn);
phyinfo = cfcnfg_get_phyinfo(cnfg, phyid);
if (phyinfo == NULL) {
pr_warning("CAIF: %s(): No interface to send disconnect to\n",
__func__);
ret = -ENODEV;
goto end;
}
if (phyinfo->id != phyid
|| phyinfo->phy_layer->id != phyid
|| phyinfo->frm_layer->id != phyid) {
pr_err("CAIF: %s(): Inconsistency in phy registration\n",
__func__);
ret = -EINVAL;
goto end;
}
ret = cfctrl_linkdown_req(cnfg->ctrl, channel_id, adap_layer);
end:
if (phyinfo != NULL && --phyinfo->phy_ref_count == 0 &&
phyinfo->phy_layer != NULL &&
phyinfo->phy_layer->modemcmd != NULL) {
phyinfo->phy_layer->modemcmd(phyinfo->phy_layer,
_CAIF_MODEMCMD_PHYIF_USELESS);
}
return ret;
}
EXPORT_SYMBOL(cfcnfg_del_adapt_layer);
static void cncfg_linkdestroy_rsp(struct cflayer *layer, u8 linkid,
struct cflayer *client_layer)
{
struct cfcnfg *cnfg = container_obj(layer);
struct cflayer *servl;
/*
* 1) Remove service from the MUX layer. The MUX must
* guarante that no more payload sent "upwards" (receive)
*/
servl = cfmuxl_remove_uplayer(cnfg->mux, linkid);
if (servl == NULL) {
pr_err("CAIF: %s(): PROTOCOL ERROR "
"- Error removing service_layer Linkid(%d)",
__func__, linkid);
return;
}
caif_assert(linkid == servl->id);
if (servl != client_layer && servl->up != client_layer) {
pr_err("CAIF: %s(): Error removing service_layer "
"Linkid(%d) %p %p",
__func__, linkid, (void *) servl,
(void *) client_layer);
return;
}
/*
* 2) DEINIT_RSP must guarantee that no more packets are transmitted
* from client (adap_layer) when it returns.
*/
if (servl->ctrlcmd == NULL) {
pr_err("CAIF: %s(): Error servl->ctrlcmd == NULL", __func__);
return;
}
servl->ctrlcmd(servl, CAIF_CTRLCMD_DEINIT_RSP, 0);
/* 3) It is now safe to destroy the service layer. */
cfservl_destroy(servl);
}
/*
* NOTE: What happens on linksetup failure:
* 1a) No response - Too early
* This will not happen because enumerate is secured
* before using interface.
* 1b) No response - FATAL
* Not handled, but this should be a CAIF PROTOCOL ERROR
* Modem error, response is really expected - this case is
* not really handled.
* 2) O/E-bit indicate error
* Handled in cnfg_reject_rsp
* 3) Not able to match on request
* Not handled, but this should be a CAIF PROTOCOL ERROR
* 4) Link-Error - (no response)
* Not handled, but this should be a CAIF PROTOCOL ERROR
*/
int
cfcnfg_add_adaptation_layer(struct cfcnfg *cnfg,
struct cfctrl_link_param *param,
struct cflayer *adap_layer)
{
struct cflayer *frml;
if (adap_layer == NULL) {
pr_err("CAIF: %s(): adap_layer is zero", __func__);
return -EINVAL;
}
if (adap_layer->receive == NULL) {
pr_err("CAIF: %s(): adap_layer->receive is NULL", __func__);
return -EINVAL;
}
if (adap_layer->ctrlcmd == NULL) {
pr_err("CAIF: %s(): adap_layer->ctrlcmd == NULL", __func__);
return -EINVAL;
}
frml = cnfg->phy_layers[param->phyid].frm_layer;
if (frml == NULL) {
pr_err("CAIF: %s(): Specified PHY type does not exist!",
__func__);
return -ENODEV;
}
caif_assert(param->phyid == cnfg->phy_layers[param->phyid].id);
caif_assert(cnfg->phy_layers[param->phyid].frm_layer->id ==
param->phyid);
caif_assert(cnfg->phy_layers[param->phyid].phy_layer->id ==
param->phyid);
/* FIXME: ENUMERATE INITIALLY WHEN ACTIVATING PHYSICAL INTERFACE */
cfctrl_enum_req(cnfg->ctrl, param->phyid);
cfctrl_linkup_request(cnfg->ctrl, param, adap_layer);
return 0;
}
EXPORT_SYMBOL(cfcnfg_add_adaptation_layer);
static void cncfg_reject_rsp(struct cflayer *layer, u8 linkid,
struct cflayer *adapt_layer)
{
if (adapt_layer != NULL && adapt_layer->ctrlcmd != NULL)
adapt_layer->ctrlcmd(adapt_layer,
CAIF_CTRLCMD_INIT_FAIL_RSP, 0);
}
static void
cncfg_linkup_rsp(struct cflayer *layer, u8 linkid, enum cfctrl_srv serv,
u8 phyid, struct cflayer *adapt_layer)
{
struct cfcnfg *cnfg = container_obj(layer);
struct cflayer *servicel = NULL;
struct cfcnfg_phyinfo *phyinfo;
if (adapt_layer == NULL) {
pr_err("CAIF: %s(): PROTOCOL ERROR "
"- LinkUp Request/Response did not match\n", __func__);
return;
}
caif_assert(cnfg != NULL);
caif_assert(phyid != 0);
phyinfo = &cnfg->phy_layers[phyid];
caif_assert(phyinfo != NULL);
caif_assert(phyinfo->id == phyid);
caif_assert(phyinfo->phy_layer != NULL);
caif_assert(phyinfo->phy_layer->id == phyid);
if (phyinfo != NULL &&
phyinfo->phy_ref_count++ == 0 &&
phyinfo->phy_layer != NULL &&
phyinfo->phy_layer->modemcmd != NULL) {
caif_assert(phyinfo->phy_layer->id == phyid);
phyinfo->phy_layer->modemcmd(phyinfo->phy_layer,
_CAIF_MODEMCMD_PHYIF_USEFULL);
}
adapt_layer->id = linkid;
switch (serv) {
case CFCTRL_SRV_VEI:
servicel = cfvei_create(linkid, &phyinfo->dev_info);
break;
case CFCTRL_SRV_DATAGRAM:
servicel = cfdgml_create(linkid, &phyinfo->dev_info);
break;
case CFCTRL_SRV_RFM:
servicel = cfrfml_create(linkid, &phyinfo->dev_info);
break;
case CFCTRL_SRV_UTIL:
servicel = cfutill_create(linkid, &phyinfo->dev_info);
break;
case CFCTRL_SRV_VIDEO:
servicel = cfvidl_create(linkid, &phyinfo->dev_info);
break;
case CFCTRL_SRV_DBG:
servicel = cfdbgl_create(linkid, &phyinfo->dev_info);
break;
default:
pr_err("CAIF: %s(): Protocol error. "
"Link setup response - unknown channel type\n",
__func__);
return;
}
if (!servicel) {
pr_warning("CAIF: %s(): Out of memory\n", __func__);
return;
}
layer_set_dn(servicel, cnfg->mux);
cfmuxl_set_uplayer(cnfg->mux, servicel, linkid);
layer_set_up(servicel, adapt_layer);
layer_set_dn(adapt_layer, servicel);
servicel->ctrlcmd(servicel, CAIF_CTRLCMD_INIT_RSP, 0);
}
void
cfcnfg_add_phy_layer(struct cfcnfg *cnfg, enum cfcnfg_phy_type phy_type,
void *dev, struct cflayer *phy_layer, u16 *phyid,
enum cfcnfg_phy_preference pref,
bool fcs, bool stx)
{
struct cflayer *frml;
struct cflayer *phy_driver = NULL;
int i;
if (cnfg->phy_layers[cnfg->last_phyid].frm_layer == NULL) {
*phyid = cnfg->last_phyid;
/* range: * 1..(MAX_PHY_LAYERS-1) */
cnfg->last_phyid =
(cnfg->last_phyid % (MAX_PHY_LAYERS - 1)) + 1;
} else {
*phyid = 0;
for (i = 1; i < MAX_PHY_LAYERS; i++) {
if (cnfg->phy_layers[i].frm_layer == NULL) {
*phyid = i;
break;
}
}
}
if (*phyid == 0) {
pr_err("CAIF: %s(): No Available PHY ID\n", __func__);
return;
}
switch (phy_type) {
case CFPHYTYPE_FRAG:
phy_driver =
cfserl_create(CFPHYTYPE_FRAG, *phyid, stx);
if (!phy_driver) {
pr_warning("CAIF: %s(): Out of memory\n", __func__);
return;
}
break;
case CFPHYTYPE_CAIF:
phy_driver = NULL;
break;
default:
pr_err("CAIF: %s(): %d", __func__, phy_type);
return;
break;
}
phy_layer->id = *phyid;
cnfg->phy_layers[*phyid].pref = pref;
cnfg->phy_layers[*phyid].id = *phyid;
cnfg->phy_layers[*phyid].dev_info.id = *phyid;
cnfg->phy_layers[*phyid].dev_info.dev = dev;
cnfg->phy_layers[*phyid].phy_layer = phy_layer;
cnfg->phy_layers[*phyid].phy_ref_count = 0;
phy_layer->type = phy_type;
frml = cffrml_create(*phyid, fcs);
if (!frml) {
pr_warning("CAIF: %s(): Out of memory\n", __func__);
return;
}
cnfg->phy_layers[*phyid].frm_layer = frml;
cfmuxl_set_dnlayer(cnfg->mux, frml, *phyid);
layer_set_up(frml, cnfg->mux);
if (phy_driver != NULL) {
phy_driver->id = *phyid;
layer_set_dn(frml, phy_driver);
layer_set_up(phy_driver, frml);
layer_set_dn(phy_driver, phy_layer);
layer_set_up(phy_layer, phy_driver);
} else {
layer_set_dn(frml, phy_layer);
layer_set_up(phy_layer, frml);
}
}
EXPORT_SYMBOL(cfcnfg_add_phy_layer);
int cfcnfg_del_phy_layer(struct cfcnfg *cnfg, struct cflayer *phy_layer)
{
struct cflayer *frml, *frml_dn;
u16 phyid;
phyid = phy_layer->id;
caif_assert(phyid == cnfg->phy_layers[phyid].id);
caif_assert(phy_layer == cnfg->phy_layers[phyid].phy_layer);
caif_assert(phy_layer->id == phyid);
caif_assert(cnfg->phy_layers[phyid].frm_layer->id == phyid);
memset(&cnfg->phy_layers[phy_layer->id], 0,
sizeof(struct cfcnfg_phyinfo));
frml = cfmuxl_remove_dnlayer(cnfg->mux, phy_layer->id);
frml_dn = frml->dn;
cffrml_set_uplayer(frml, NULL);
cffrml_set_dnlayer(frml, NULL);
kfree(frml);
if (phy_layer != frml_dn) {
layer_set_up(frml_dn, NULL);
layer_set_dn(frml_dn, NULL);
kfree(frml_dn);
}
layer_set_up(phy_layer, NULL);
return 0;
}
EXPORT_SYMBOL(cfcnfg_del_phy_layer);
/*
* Copyright (C) ST-Ericsson AB 2010
* Author: Sjur Brendeland/sjur.brandeland@stericsson.com
* License terms: GNU General Public License (GPL) version 2
*/
#include <linux/string.h>
#include <linux/skbuff.h>
#include <linux/hardirq.h>
#include <net/caif/cfpkt.h>
#define PKT_PREFIX CAIF_NEEDED_HEADROOM
#define PKT_POSTFIX CAIF_NEEDED_TAILROOM
#define PKT_LEN_WHEN_EXTENDING 128
#define PKT_ERROR(pkt, errmsg) do { \
cfpkt_priv(pkt)->erronous = true; \
skb_reset_tail_pointer(&pkt->skb); \
pr_warning("CAIF: " errmsg);\
} while (0)
struct cfpktq {
struct sk_buff_head head;
atomic_t count;
/* Lock protects count updates */
spinlock_t lock;
};
/*
* net/caif/ is generic and does not
* understand SKB, so we do this typecast
*/
struct cfpkt {
struct sk_buff skb;
};
/* Private data inside SKB */
struct cfpkt_priv_data {
struct dev_info dev_info;
bool erronous;
};
inline struct cfpkt_priv_data *cfpkt_priv(struct cfpkt *pkt)
{
return (struct cfpkt_priv_data *) pkt->skb.cb;
}
inline bool is_erronous(struct cfpkt *pkt)
{
return cfpkt_priv(pkt)->erronous;
}
inline struct sk_buff *pkt_to_skb(struct cfpkt *pkt)
{
return &pkt->skb;
}
inline struct cfpkt *skb_to_pkt(struct sk_buff *skb)
{
return (struct cfpkt *) skb;
}
struct cfpkt *cfpkt_fromnative(enum caif_direction dir, void *nativepkt)
{
struct cfpkt *pkt = skb_to_pkt(nativepkt);
cfpkt_priv(pkt)->erronous = false;
return pkt;
}
EXPORT_SYMBOL(cfpkt_fromnative);
void *cfpkt_tonative(struct cfpkt *pkt)
{
return (void *) pkt;
}
EXPORT_SYMBOL(cfpkt_tonative);
static struct cfpkt *cfpkt_create_pfx(u16 len, u16 pfx)
{
struct sk_buff *skb;
if (likely(in_interrupt()))
skb = alloc_skb(len + pfx, GFP_ATOMIC);
else
skb = alloc_skb(len + pfx, GFP_KERNEL);
if (unlikely(skb == NULL))
return NULL;
skb_reserve(skb, pfx);
return skb_to_pkt(skb);
}
inline struct cfpkt *cfpkt_create(u16 len)
{
return cfpkt_create_pfx(len + PKT_POSTFIX, PKT_PREFIX);
}
EXPORT_SYMBOL(cfpkt_create);
void cfpkt_destroy(struct cfpkt *pkt)
{
struct sk_buff *skb = pkt_to_skb(pkt);
kfree_skb(skb);
}
EXPORT_SYMBOL(cfpkt_destroy);
inline bool cfpkt_more(struct cfpkt *pkt)
{
struct sk_buff *skb = pkt_to_skb(pkt);
return skb->len > 0;
}
EXPORT_SYMBOL(cfpkt_more);
int cfpkt_peek_head(struct cfpkt *pkt, void *data, u16 len)
{
struct sk_buff *skb = pkt_to_skb(pkt);
if (skb_headlen(skb) >= len) {
memcpy(data, skb->data, len);
return 0;
}
return !cfpkt_extr_head(pkt, data, len) &&
!cfpkt_add_head(pkt, data, len);
}
EXPORT_SYMBOL(cfpkt_peek_head);
int cfpkt_extr_head(struct cfpkt *pkt, void *data, u16 len)
{
struct sk_buff *skb = pkt_to_skb(pkt);
u8 *from;
if (unlikely(is_erronous(pkt)))
return -EPROTO;
if (unlikely(len > skb->len)) {
PKT_ERROR(pkt, "cfpkt_extr_head read beyond end of packet\n");
return -EPROTO;
}
if (unlikely(len > skb_headlen(skb))) {
if (unlikely(skb_linearize(skb) != 0)) {
PKT_ERROR(pkt, "cfpkt_extr_head linearize failed\n");
return -EPROTO;
}
}
from = skb_pull(skb, len);
from -= len;
memcpy(data, from, len);
return 0;
}
EXPORT_SYMBOL(cfpkt_extr_head);
int cfpkt_extr_trail(struct cfpkt *pkt, void *dta, u16 len)
{
struct sk_buff *skb = pkt_to_skb(pkt);
u8 *data = dta;
u8 *from;
if (unlikely(is_erronous(pkt)))
return -EPROTO;
if (unlikely(skb_linearize(skb) != 0)) {
PKT_ERROR(pkt, "cfpkt_extr_trail linearize failed\n");
return -EPROTO;
}
if (unlikely(skb->data + len > skb_tail_pointer(skb))) {
PKT_ERROR(pkt, "cfpkt_extr_trail read beyond end of packet\n");
return -EPROTO;
}
from = skb_tail_pointer(skb) - len;
skb_trim(skb, skb->len - len);
memcpy(data, from, len);
return 0;
}
EXPORT_SYMBOL(cfpkt_extr_trail);
int cfpkt_pad_trail(struct cfpkt *pkt, u16 len)
{
return cfpkt_add_body(pkt, NULL, len);
}
EXPORT_SYMBOL(cfpkt_pad_trail);
int cfpkt_add_body(struct cfpkt *pkt, const void *data, u16 len)
{
struct sk_buff *skb = pkt_to_skb(pkt);
struct sk_buff *lastskb;
u8 *to;
u16 addlen = 0;
if (unlikely(is_erronous(pkt)))
return -EPROTO;
lastskb = skb;
/* Check whether we need to add space at the tail */
if (unlikely(skb_tailroom(skb) < len)) {
if (likely(len < PKT_LEN_WHEN_EXTENDING))
addlen = PKT_LEN_WHEN_EXTENDING;
else
addlen = len;
}
/* Check whether we need to change the SKB before writing to the tail */
if (unlikely((addlen > 0) || skb_cloned(skb) || skb_shared(skb))) {
/* Make sure data is writable */
if (unlikely(skb_cow_data(skb, addlen, &lastskb) < 0)) {
PKT_ERROR(pkt, "cfpkt_add_body: cow failed\n");
return -EPROTO;
}
/*
* Is the SKB non-linear after skb_cow_data()? If so, we are
* going to add data to the last SKB, so we need to adjust
* lengths of the top SKB.
*/
if (lastskb != skb) {
pr_warning("CAIF: %s(): Packet is non-linear\n",
__func__);
skb->len += len;
skb->data_len += len;
}
}
/* All set to put the last SKB and optionally write data there. */
to = skb_put(lastskb, len);
if (likely(data))
memcpy(to, data, len);
return 0;
}
EXPORT_SYMBOL(cfpkt_add_body);
inline int cfpkt_addbdy(struct cfpkt *pkt, u8 data)
{
return cfpkt_add_body(pkt, &data, 1);
}
EXPORT_SYMBOL(cfpkt_addbdy);
int cfpkt_add_head(struct cfpkt *pkt, const void *data2, u16 len)
{
struct sk_buff *skb = pkt_to_skb(pkt);
struct sk_buff *lastskb;
u8 *to;
const u8 *data = data2;
if (unlikely(is_erronous(pkt)))
return -EPROTO;
if (unlikely(skb_headroom(skb) < len)) {
PKT_ERROR(pkt, "cfpkt_add_head: no headroom\n");
return -EPROTO;
}
/* Make sure data is writable */
if (unlikely(skb_cow_data(skb, 0, &lastskb) < 0)) {
PKT_ERROR(pkt, "cfpkt_add_head: cow failed\n");
return -EPROTO;
}
to = skb_push(skb, len);
memcpy(to, data, len);
return 0;
}
EXPORT_SYMBOL(cfpkt_add_head);
inline int cfpkt_add_trail(struct cfpkt *pkt, const void *data, u16 len)
{
return cfpkt_add_body(pkt, data, len);
}
EXPORT_SYMBOL(cfpkt_add_trail);
inline u16 cfpkt_getlen(struct cfpkt *pkt)
{
struct sk_buff *skb = pkt_to_skb(pkt);
return skb->len;
}
EXPORT_SYMBOL(cfpkt_getlen);
inline u16 cfpkt_iterate(struct cfpkt *pkt,
u16 (*iter_func)(u16, void *, u16),
u16 data)
{
/*
* Don't care about the performance hit of linearizing,
* Checksum should not be used on high-speed interfaces anyway.
*/
if (unlikely(is_erronous(pkt)))
return -EPROTO;
if (unlikely(skb_linearize(&pkt->skb) != 0)) {
PKT_ERROR(pkt, "cfpkt_iterate: linearize failed\n");
return -EPROTO;
}
return iter_func(data, pkt->skb.data, cfpkt_getlen(pkt));
}
EXPORT_SYMBOL(cfpkt_iterate);
int cfpkt_setlen(struct cfpkt *pkt, u16 len)
{
struct sk_buff *skb = pkt_to_skb(pkt);
if (unlikely(is_erronous(pkt)))
return -EPROTO;
if (likely(len <= skb->len)) {
if (unlikely(skb->data_len))
___pskb_trim(skb, len);
else
skb_trim(skb, len);
return cfpkt_getlen(pkt);
}
/* Need to expand SKB */
if (unlikely(!cfpkt_pad_trail(pkt, len - skb->len)))
PKT_ERROR(pkt, "cfpkt_setlen: skb_pad_trail failed\n");
return cfpkt_getlen(pkt);
}
EXPORT_SYMBOL(cfpkt_setlen);
struct cfpkt *cfpkt_create_uplink(const unsigned char *data, unsigned int len)
{
struct cfpkt *pkt = cfpkt_create_pfx(len + PKT_POSTFIX, PKT_PREFIX);
if (unlikely(data != NULL))
cfpkt_add_body(pkt, data, len);
return pkt;
}
EXPORT_SYMBOL(cfpkt_create_uplink);
struct cfpkt *cfpkt_append(struct cfpkt *dstpkt,
struct cfpkt *addpkt,
u16 expectlen)
{
struct sk_buff *dst = pkt_to_skb(dstpkt);
struct sk_buff *add = pkt_to_skb(addpkt);
u16 addlen = skb_headlen(add);
u16 neededtailspace;
struct sk_buff *tmp;
u16 dstlen;
u16 createlen;
if (unlikely(is_erronous(dstpkt) || is_erronous(addpkt))) {
cfpkt_destroy(addpkt);
return dstpkt;
}
if (expectlen > addlen)
neededtailspace = expectlen;
else
neededtailspace = addlen;
if (dst->tail + neededtailspace > dst->end) {
/* Create a dumplicate of 'dst' with more tail space */
dstlen = skb_headlen(dst);
createlen = dstlen + neededtailspace;
tmp = pkt_to_skb(
cfpkt_create(createlen + PKT_PREFIX + PKT_POSTFIX));
if (!tmp)
return NULL;
skb_set_tail_pointer(tmp, dstlen);
tmp->len = dstlen;
memcpy(tmp->data, dst->data, dstlen);
cfpkt_destroy(dstpkt);
dst = tmp;
}
memcpy(skb_tail_pointer(dst), add->data, skb_headlen(add));
cfpkt_destroy(addpkt);
dst->tail += addlen;
dst->len += addlen;
return skb_to_pkt(dst);
}
EXPORT_SYMBOL(cfpkt_append);
struct cfpkt *cfpkt_split(struct cfpkt *pkt, u16 pos)
{
struct sk_buff *skb2;
struct sk_buff *skb = pkt_to_skb(pkt);
u8 *split = skb->data + pos;
u16 len2nd = skb_tail_pointer(skb) - split;
if (unlikely(is_erronous(pkt)))
return NULL;
if (skb->data + pos > skb_tail_pointer(skb)) {
PKT_ERROR(pkt,
"cfpkt_split: trying to split beyond end of packet");
return NULL;
}
/* Create a new packet for the second part of the data */
skb2 = pkt_to_skb(
cfpkt_create_pfx(len2nd + PKT_PREFIX + PKT_POSTFIX,
PKT_PREFIX));
if (skb2 == NULL)
return NULL;
/* Reduce the length of the original packet */
skb_set_tail_pointer(skb, pos);
skb->len = pos;
memcpy(skb2->data, split, len2nd);
skb2->tail += len2nd;
skb2->len += len2nd;
return skb_to_pkt(skb2);
}
EXPORT_SYMBOL(cfpkt_split);
char *cfpkt_log_pkt(struct cfpkt *pkt, char *buf, int buflen)
{
struct sk_buff *skb = pkt_to_skb(pkt);
char *p = buf;
int i;
/*
* Sanity check buffer length, it needs to be at least as large as
* the header info: ~=50+ bytes
*/
if (buflen < 50)
return NULL;
snprintf(buf, buflen, "%s: pkt:%p len:%ld(%ld+%ld) {%ld,%ld} data: [",
is_erronous(pkt) ? "ERRONOUS-SKB" :
(skb->data_len != 0 ? "COMPLEX-SKB" : "SKB"),
skb,
(long) skb->len,
(long) (skb_tail_pointer(skb) - skb->data),
(long) skb->data_len,
(long) (skb->data - skb->head),
(long) (skb_tail_pointer(skb) - skb->head));
p = buf + strlen(buf);
for (i = 0; i < skb_tail_pointer(skb) - skb->data && i < 300; i++) {
if (p > buf + buflen - 10) {
sprintf(p, "...");
p = buf + strlen(buf);
break;
}
sprintf(p, "%02x,", skb->data[i]);
p = buf + strlen(buf);
}
sprintf(p, "]\n");
return buf;
}
EXPORT_SYMBOL(cfpkt_log_pkt);
int cfpkt_raw_append(struct cfpkt *pkt, void **buf, unsigned int buflen)
{
struct sk_buff *skb = pkt_to_skb(pkt);
struct sk_buff *lastskb;
caif_assert(buf != NULL);
if (unlikely(is_erronous(pkt)))
return -EPROTO;
/* Make sure SKB is writable */
if (unlikely(skb_cow_data(skb, 0, &lastskb) < 0)) {
PKT_ERROR(pkt, "cfpkt_raw_append: skb_cow_data failed\n");
return -EPROTO;
}
if (unlikely(skb_linearize(skb) != 0)) {
PKT_ERROR(pkt, "cfpkt_raw_append: linearize failed\n");
return -EPROTO;
}
if (unlikely(skb_tailroom(skb) < buflen)) {
PKT_ERROR(pkt, "cfpkt_raw_append: buffer too short - failed\n");
return -EPROTO;
}
*buf = skb_put(skb, buflen);
return 1;
}
EXPORT_SYMBOL(cfpkt_raw_append);
int cfpkt_raw_extract(struct cfpkt *pkt, void **buf, unsigned int buflen)
{
struct sk_buff *skb = pkt_to_skb(pkt);
caif_assert(buf != NULL);
if (unlikely(is_erronous(pkt)))
return -EPROTO;
if (unlikely(buflen > skb->len)) {
PKT_ERROR(pkt, "cfpkt_raw_extract: buflen too large "
"- failed\n");
return -EPROTO;
}
if (unlikely(buflen > skb_headlen(skb))) {
if (unlikely(skb_linearize(skb) != 0)) {
PKT_ERROR(pkt, "cfpkt_raw_extract: linearize failed\n");
return -EPROTO;
}
}
*buf = skb->data;
skb_pull(skb, buflen);
return 1;
}
EXPORT_SYMBOL(cfpkt_raw_extract);
inline bool cfpkt_erroneous(struct cfpkt *pkt)
{
return cfpkt_priv(pkt)->erronous;
}
EXPORT_SYMBOL(cfpkt_erroneous);
struct cfpktq *cfpktq_create(void)
{
struct cfpktq *q = kmalloc(sizeof(struct cfpktq), GFP_ATOMIC);
if (!q)
return NULL;
skb_queue_head_init(&q->head);
atomic_set(&q->count, 0);
spin_lock_init(&q->lock);
return q;
}
EXPORT_SYMBOL(cfpktq_create);
void cfpkt_queue(struct cfpktq *pktq, struct cfpkt *pkt, unsigned short prio)
{
atomic_inc(&pktq->count);
spin_lock(&pktq->lock);
skb_queue_tail(&pktq->head, pkt_to_skb(pkt));
spin_unlock(&pktq->lock);
}
EXPORT_SYMBOL(cfpkt_queue);
struct cfpkt *cfpkt_qpeek(struct cfpktq *pktq)
{
struct cfpkt *tmp;
spin_lock(&pktq->lock);
tmp = skb_to_pkt(skb_peek(&pktq->head));
spin_unlock(&pktq->lock);
return tmp;
}
EXPORT_SYMBOL(cfpkt_qpeek);
struct cfpkt *cfpkt_dequeue(struct cfpktq *pktq)
{
struct cfpkt *pkt;
spin_lock(&pktq->lock);
pkt = skb_to_pkt(skb_dequeue(&pktq->head));
if (pkt) {
atomic_dec(&pktq->count);
caif_assert(atomic_read(&pktq->count) >= 0);
}
spin_unlock(&pktq->lock);
return pkt;
}
EXPORT_SYMBOL(cfpkt_dequeue);
int cfpkt_qcount(struct cfpktq *pktq)
{
return atomic_read(&pktq->count);
}
EXPORT_SYMBOL(cfpkt_qcount);
struct cfpkt *cfpkt_clone_release(struct cfpkt *pkt)
{
struct cfpkt *clone;
clone = skb_to_pkt(skb_clone(pkt_to_skb(pkt), GFP_ATOMIC));
/* Free original packet. */
cfpkt_destroy(pkt);
if (!clone)
return NULL;
return clone;
}
EXPORT_SYMBOL(cfpkt_clone_release);
struct caif_payload_info *cfpkt_info(struct cfpkt *pkt)
{
return (struct caif_payload_info *)&pkt_to_skb(pkt)->cb;
}
EXPORT_SYMBOL(cfpkt_info);
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