diff options
Diffstat (limited to 'net/caif')
| -rw-r--r-- | net/caif/cfcnfg.c | 529 | ||||
| -rw-r--r-- | net/caif/cfpkt_skbuff.c | 571 |
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 @@ +/* + * 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); 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 @@ +/* + * 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); |
