p80211frm.c

Linux的无线局域网方案是一个Linux设备驱动程序和子系统 一揽子方案的用意是提供全系列的IEEE 802.11标准的Mac 管理功能

                        (WLAN_HDR_A3_DATAP(&(f->hdr->a3)) +
                         WLAN_REASSOCRESP_OFF_SUPP_RATES);

        return;
}


/*--------------------------------------------------------------
* wlan_mgmt_encode_probereq
*
* Receives an fr_mgmt struct with its len and buf set.  Fills
* in the rest of the members as far as possible.  On entry len
* is the length of the buffer, on return len is the actual length
* of the frame with all the currently encoded fields.  For 
* frames where the caller adds variable/optional IEs, the caller
* will have to update the len field.
* On entry Assumptions:
*	1) f->len and f->buf are already set
*	2) f->len is the length of the MAC header + data, the CRC
*	   is NOT included
*	3) all members except len, buf, and priv are zero
*
* Arguments:
*	f	frame structure 
*
* Returns:
*	nothing
*
* Side effects:
*	frame  structure members are pointing at their
*	respective portions of the frame buffer.
--------------------------------------------------------------*/
void wlan_mgmt_encode_probereq( wlan_fr_probereq_t  *f )
{
        f->type = WLAN_FSTYPE_PROBEREQ;
        f->hdr = (p80211_hdr_t*)f->buf;

        WLAN_ASSERT( f->len >= WLAN_PROBEREQ_FR_MAXLEN );

        f->len = WLAN_HDR_A3_LEN;

        return;
}


/*--------------------------------------------------------------
* wlan_mgmt_decode_probereq
*
* Given a complete frame in f->buf, sets the pointers in f to 
* the areas that correspond to the parts of the frame.
*
* Assumptions:
*	1) f->len and f->buf are already set
*	2) f->len is the length of the MAC header + data, the CRC
*	   is NOT included
*	3) all members except len and buf are zero
*
* Arguments:
*	f	frame structure 
*
* Returns:
*	nothing
*
* Side effects:
*	frame  structure members are pointing at their
*	respective portions of the frame buffer.
--------------------------------------------------------------*/
void wlan_mgmt_decode_probereq( wlan_fr_probereq_t  *f )
{
        wlan_ie_t	*ie_ptr;

        f->type = WLAN_FSTYPE_PROBEREQ;
        f->hdr = (p80211_hdr_t*)f->buf;

        WLAN_ASSERT(WLAN_FTYPE_MGMT ==
                    WLAN_GET_FC_FTYPE(ieee2host16(f->hdr->a3.fc)));
        WLAN_ASSERT(WLAN_FSTYPE_PROBEREQ ==
                    WLAN_GET_FC_FSTYPE(ieee2host16(f->hdr->a3.fc)));

        /*-- Fixed Fields ----*/

        /*-- Information elements */
        ie_ptr = (wlan_ie_t*)(WLAN_HDR_A3_DATAP(&(f->hdr->a3))
                              + WLAN_PROBEREQ_OFF_SSID);
        while( ((UINT8*)ie_ptr) < (f->buf + f->len) ) {
                switch (ie_ptr->eid) {
                case WLAN_EID_SSID:
                        f->ssid = (wlan_ie_ssid_t*)ie_ptr;
                        break;
                case WLAN_EID_SUPP_RATES:
                        f->supp_rates = (wlan_ie_supp_rates_t*)ie_ptr;
                        break;
                default:
                        WLAN_LOG_WARNING1(
                                "Unrecognized EID=%dd in probereq decode.\n",
                                ie_ptr->eid);
                        WLAN_HEX_DUMP(3, "frm w/ bad eid:", f->buf, f->len );
                        break;
                }
                ie_ptr = (wlan_ie_t*)(((UINT8*)ie_ptr) + 2 + ie_ptr->len);
        }
        return;
}


/*--------------------------------------------------------------
* wlan_mgmt_encode_proberesp
*
* Receives an fr_mgmt struct with its len and buf set.  Fills
* in the rest of the members as far as possible.  On entry len
* is the length of the buffer, on return len is the actual length
* of the frame with all the currently encoded fields.  For 
* frames where the caller adds variable/optional IEs, the caller
* will have to update the len field.
* On entry Assumptions:
*	1) f->len and f->buf are already set
*	2) f->len is the length of the MAC header + data, the CRC
*	   is NOT included
*	3) all members except len, buf, and priv are zero
*
* Arguments:
*	f	frame structure 
*
* Returns:
*	nothing
*
* Side effects:
*	frame  structure members are pointing at their
*	respective portions of the frame buffer.
--------------------------------------------------------------*/
void wlan_mgmt_encode_proberesp( wlan_fr_proberesp_t  *f )
{
        f->type = WLAN_FSTYPE_PROBERESP;
        f->hdr = (p80211_hdr_t*)f->buf;

        WLAN_ASSERT( f->len >= WLAN_PROBERESP_FR_MAXLEN );

        /*-- Fixed Fields ----*/
        f->ts		=(UINT64*)(WLAN_HDR_A3_DATAP(&(f->hdr->a3))
                          + WLAN_PROBERESP_OFF_TS);
        f->bcn_int	=(UINT16*)(WLAN_HDR_A3_DATAP(&(f->hdr->a3))
                              + WLAN_PROBERESP_OFF_BCN_INT);
        f->cap_info	=(UINT16*)(WLAN_HDR_A3_DATAP(&(f->hdr->a3))
                               + WLAN_PROBERESP_OFF_CAP_INFO);

        f->len = WLAN_HDR_A3_LEN + WLAN_PROBERESP_OFF_CAP_INFO +
                 sizeof(*(f->cap_info));

        return;
}


/*--------------------------------------------------------------
* wlan_mgmt_decode_proberesp
*
* Given a complete frame in f->buf, sets the pointers in f to 
* the areas that correspond to the parts of the frame.
*
* Assumptions:
*	1) f->len and f->buf are already set
*	2) f->len is the length of the MAC header + data, the CRC
*	   is NOT included
*	3) all members except len and buf are zero
*
* Arguments:
*	f	frame structure 
*
* Returns:
*	nothing
*
* Side effects:
*	frame  structure members are pointing at their
*	respective portions of the frame buffer.
--------------------------------------------------------------*/
void wlan_mgmt_decode_proberesp( wlan_fr_proberesp_t  *f )
{
        wlan_ie_t	*ie_ptr;

        f->type = WLAN_FSTYPE_PROBERESP;
        f->hdr = (p80211_hdr_t*)f->buf;

        WLAN_ASSERT(WLAN_FTYPE_MGMT ==
                    WLAN_GET_FC_FTYPE(ieee2host16(f->hdr->a3.fc)));
        WLAN_ASSERT(WLAN_FSTYPE_PROBERESP ==
                    WLAN_GET_FC_FSTYPE(ieee2host16(f->hdr->a3.fc)));

        /*-- Fixed Fields ----*/
        f->ts		=(UINT64*)(WLAN_HDR_A3_DATAP(&(f->hdr->a3))
                          + WLAN_PROBERESP_OFF_TS);
        f->bcn_int	=(UINT16*)(WLAN_HDR_A3_DATAP(&(f->hdr->a3))
                              + WLAN_PROBERESP_OFF_BCN_INT);
        f->cap_info	=(UINT16*)(WLAN_HDR_A3_DATAP(&(f->hdr->a3))
                               + WLAN_PROBERESP_OFF_CAP_INFO);

        /*-- Information elements */
        ie_ptr = (wlan_ie_t*)(WLAN_HDR_A3_DATAP(&(f->hdr->a3))
                              + WLAN_PROBERESP_OFF_SSID);
        while( ((UINT8*)ie_ptr) < (f->buf + f->len) ) {
                switch (ie_ptr->eid) {
                case WLAN_EID_SSID:
                        f->ssid = (wlan_ie_ssid_t*)ie_ptr;
                        break;
                case WLAN_EID_SUPP_RATES:
                        f->supp_rates = (wlan_ie_supp_rates_t*)ie_ptr;
                        break;
                case WLAN_EID_FH_PARMS:
                        f->fh_parms = (wlan_ie_fh_parms_t*)ie_ptr;
                        break;
                case WLAN_EID_DS_PARMS:
                        f->ds_parms = (wlan_ie_ds_parms_t*)ie_ptr;
                        break;
                case WLAN_EID_CF_PARMS:
                        f->cf_parms = (wlan_ie_cf_parms_t*)ie_ptr;
                        break;
                case WLAN_EID_IBSS_PARMS:
                        f->ibss_parms = (wlan_ie_ibss_parms_t*)ie_ptr;
                        break;
                default:
                        WLAN_LOG_WARNING2(
                                "Bad EID=%dd in proberesp, off=%d .\n",
                                ie_ptr->eid, f->buf - (UINT8*)ie_ptr);
                        WLAN_HEX_DUMP(3, "frm w/ bad eid:", f->buf, f->len );
                        break;
                }

                ie_ptr = (wlan_ie_t*)(((UINT8*)ie_ptr) + 2 +  ie_ptr->len);
        }
        return;
}


/*--------------------------------------------------------------
* wlan_mgmt_encode_authen
*
* Receives an fr_mgmt struct with its len and buf set.  Fills
* in the rest of the members as far as possible.  On entry len
* is the length of the buffer, on return len is the actual length
* of the frame with all the currently encoded fields.  For 
* frames where the caller adds variable/optional IEs, the caller
* will have to update the len field.
* On entry Assumptions:
*	1) f->len and f->buf are already set
*	2) f->len is the length of the MAC header + data, the CRC
*	   is NOT included
*	3) all members except len, buf, and priv are zero
*
* Arguments:
*	f	frame structure 
*
* Returns:
*	nothing
*
* Side effects:
*	frame  structure members are pointing at their
*	respective portions of the frame buffer.
--------------------------------------------------------------*/
void wlan_mgmt_encode_authen( wlan_fr_authen_t  *f )
{
        f->type = WLAN_FSTYPE_AUTHEN;
        f->hdr = (p80211_hdr_t*)f->buf;

        WLAN_ASSERT( f->len >= WLAN_AUTHEN_FR_MAXLEN );

        /*-- Fixed Fields ----*/
        f->auth_alg	=(UINT16*)(WLAN_HDR_A3_DATAP(&(f->hdr->a3))
                               + WLAN_AUTHEN_OFF_AUTH_ALG);
        f->auth_seq	=(UINT16*)(WLAN_HDR_A3_DATAP(&(f->hdr->a3))
                               + WLAN_AUTHEN_OFF_AUTH_SEQ);
        f->status	=(UINT16*)(WLAN_HDR_A3_DATAP(&(f->hdr->a3))
                             + WLAN_AUTHEN_OFF_STATUS);

        f->len = WLAN_HDR_A3_LEN + WLAN_AUTHEN_OFF_STATUS + sizeof(*(f->status));

        return;
}


/*--------------------------------------------------------------
* wlan_mgmt_decode_authen
*
* Given a complete frame in f->buf, sets the pointers in f to 
* the areas that correspond to the parts of the frame.
*
* Assumptions:
*	1) f->len and f->buf are already set
*	2) f->len is the length of the MAC header + data, the CRC
*	   is NOT included
*	3) all members except len and buf are zero
*
* Arguments:
*	f	frame structure 
*
* Returns:
*	nothing
*
* Side effects:
*	frame  structure members are pointing at their
*	respective portions of the frame buffer.
--------------------------------------------------------------*/
void wlan_mgmt_decode_authen( wlan_fr_authen_t  *f )
{
        wlan_ie_t	*ie_ptr;

        f->type = WLAN_FSTYPE_AUTHEN;
        f->hdr = (p80211_hdr_t*)f->buf;

        WLAN_ASSERT(WLAN_FTYPE_MGMT ==
                    WLAN_GET_FC_FTYPE(ieee2host16(f->hdr->a3.fc)));
        WLAN_ASSERT(WLAN_FSTYPE_AUTHEN ==
                    WLAN_GET_FC_FSTYPE(ieee2host16(f->hdr->a3.fc)));

        /*-- Fixed Fields ----*/
        f->auth_alg	=(UINT16*)(WLAN_HDR_A3_DATAP(&(f->hdr->a3))
                               + WLAN_AUTHEN_OFF_AUTH_ALG);
        f->auth_seq	=(UINT16*)(WLAN_HDR_A3_DATAP(&(f->hdr->a3))
                               + WLAN_AUTHEN_OFF_AUTH_SEQ);
        f->status	=(UINT16*)(WLAN_HDR_A3_DATAP(&(f->hdr->a3))
                             + WLAN_AUTHEN_OFF_STATUS);

        /*-- Information elements */
        ie_ptr = (wlan_ie_t*)(WLAN_HDR_A3_DATAP(&(f->hdr->a3))
                              + WLAN_AUTHEN_OFF_CHALLENGE);
        if ((((UINT8*)ie_ptr) < (f->buf + f->len)) &&
                        (ie_ptr->eid == WLAN_EID_CHALLENGE) ) {
                f->challenge = (wlan_ie_challenge_t*)ie_ptr;
        }
        return;
}


/*--------------------------------------------------------------
* wlan_mgmt_encode_deauthen
*
* Receives an fr_mgmt struct with its len and buf set.  Fills
* in the rest of the members as far as possible.  On entry len
* is the length of the buffer, on return len is the actual length
* of the frame with all the currently encoded fields.  For 
* frames where the caller adds variable/optional IEs, the caller
* will have to update the len field.
* On entry Assumptions:
*	1) f->len and f->buf are already set
*	2) f->len is the length of the MAC header + data, the CRC
*	   is NOT included
*	3) all members except len, buf, and priv are zero
*
* Arguments:
*	f	frame structure 
*
* Returns:
*	nothing
*
* Side effects:
*	frame  structure members are pointing at their
*	respective portions of the frame buffer.
--------------------------------------------------------------*/
void wlan_mgmt_encode_deauthen( wlan_fr_deauthen_t  *f )
{
        f->type = WLAN_FSTYPE_DEAUTHEN;
        f->hdr = (p80211_hdr_t*)f->buf;

        WLAN_ASSERT( f->len >= WLAN_DEAUTHEN_FR_MAXLEN );

        /*-- Fixed Fields ----*/
        f->reason	=(UINT16*)(WLAN_HDR_A3_DATAP(&(f->hdr->a3))
                             + WLAN_DEAUTHEN_OFF_REASON);

        f->len = WLAN_HDR_A3_LEN + WLAN_DEAUTHEN_OFF_REASON + sizeof(*(f->reason));

        return;
}


/*--------------------------------------------------------------
* wlan_mgmt_decode_deauthen
*
* Given a complete frame in f->buf, sets the pointers in f to 
* the areas that correspond to the parts of the frame.
*
* Assumptions:
*	1) f->len and f->buf are already set
*	2) f->len is the length of the MAC header + data, the CRC
*	   is NOT included
*	3) all members except len and buf are zero
*
* Arguments:
*	f	frame structure 
*
* Returns:
*	nothing
*
* Side effects:
*	frame  structure members are pointing at their
*	respective portions of the frame buffer.
--------------------------------------------------------------*/
void wlan_mgmt_decode_deauthen( wlan_fr_deauthen_t  *f )
{
        f->type = WLAN_FSTYPE_DEAUTHEN;
        f->hdr = (p80211_hdr_t*)f->buf;

        WLAN_ASSERT(WLAN_FTYPE_MGMT ==
                    WLAN_GET_FC_FTYPE(ieee2host16(f->hdr->a3.fc)));
        WLAN_ASSERT(WLAN_FSTYPE_DEAUTHEN ==
                    WLAN_GET_FC_FSTYPE(ieee2host16(f->hdr->a3.fc)));

        /*-- Fixed Fields ----*/
        f->reason	=(UINT16*)(WLAN_HDR_A3_DATAP(&(f->hdr->a3))
                             + WLAN_DEAUTHEN_OFF_REASON);

        /*-- Information elements */

        return;
}