157 lines
4.4 KiB
Plaintext
157 lines
4.4 KiB
Plaintext
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/* LAPDm definitiona according to 3GPP TS 44.006 */
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/* (C) 2017 bh Harald Welte <laforge@gnumonks.org> */
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module LAPDm_Types {
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import from General_Types all;
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import from Osmocom_Types all;
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type uint3_t LapdmSapi;
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type BIT2 LapdmSBits;
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type BIT3 LapdmUBits;
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type BIT2 LapdmU2Bits;
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type record LapdmLengthIndicator {
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uint6_t len,
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boolean m,
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uint1_t el
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} with { variant "" };
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/* TS 44.006 Figure 4 */
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type record LapdmAddressField {
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BIT1 spare,
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uint2_t lpd (0),
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LapdmSapi sapi,
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boolean c_r,
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boolean ea
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} with { variant "" };
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template LapdmAddressField tr_LapdmAddr(LapdmSapi sapi, boolean c_r) := {
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spare := '0'B,
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lpd := 0,
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sapi := sapi,
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c_r := c_r,
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ea := true
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};
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type record LapdmCtrlI {
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uint3_t n_r,
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boolean p,
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uint3_t n_s,
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BIT1 spare ('0'B)
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} with { variant "" };
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type record LapdmCtrlS {
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uint3_t n_r,
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boolean p_f,
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LapdmSBits s,
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BIT2 spare ('01'B)
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} with { variant "" };
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type record LapdmCtrlU {
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LapdmUBits u,
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boolean p_f,
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LapdmU2Bits u2,
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BIT2 spare ('11'B)
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} with { variant "" };
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/* TS 44.006 Table 3 */
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type union LapdmCtrl {
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LapdmCtrlI i,
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LapdmCtrlS s,
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LapdmCtrlU u
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} with { variant "TAG(i, spare = '0'B;
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s, spare = '01'B;
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u, spare = '11'B)" };
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template LapdmCtrl t_LapdmCtrlS := {
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s := { n_r := ?, p_f := ?, s:= ?, spare := '01'B }
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};
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template LapdmCtrl t_LapdmCtrlU := {
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u := { u := ?, p_f := ?, u2 := ?, spare := '11'B }
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};
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/* TS 44.006 Table 4 */
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template LapdmCtrl t_LapdmCtrlI(template uint3_t nr, template uint3_t ns, template boolean p) := {
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i := { n_r := nr, p := p, n_s := ns, spare := '0'B }
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};
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template LapdmCtrl t_LapdmCtrlRR(template uint3_t nr, template boolean pf) modifies t_LapdmCtrlS := {
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s := { n_r := nr, p_f := pf, s := '00'B }
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};
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template LapdmCtrl t_LapdmCtrlRNR(template uint3_t nr, template boolean pf) modifies t_LapdmCtrlS := {
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s := { n_r := nr, p_f := pf, s := '01'B }
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};
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template LapdmCtrl t_LapdmCtrlREJ(template uint3_t nr, template boolean pf) modifies t_LapdmCtrlS := {
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s := { n_r := nr, p_f := pf, s := '10'B }
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};
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template LapdmCtrl t_LapdmCtrlSABM(template boolean p) modifies t_LapdmCtrlU := {
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u := { u := '001'B, p_f := p, u2 := '11'B }
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};
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template LapdmCtrl t_LapdmCtrlDM(template boolean f) modifies t_LapdmCtrlU := {
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u := { u := '000'B, p_f := f, u2 := '11'B }
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};
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template LapdmCtrl t_LapdmCtrlUI(template boolean p) modifies t_LapdmCtrlU := {
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u := { u := '000'B, p_f := p, u2 := '00'B }
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};
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template LapdmCtrl t_LapdmCtrlDISC(template boolean p) modifies t_LapdmCtrlU := {
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u := { u := '010'B, p_f := p, u2 := '00'B }
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};
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template LapdmCtrl t_LapdmCtrlUA(template boolean f) modifies t_LapdmCtrlU := {
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u := { u := '011'B, p_f := f, u2 := '00'B }
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};
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/* Format A is used on DCCHs for frames where there is no information field */
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type record LapdmFrameA {
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LapdmAddressField addr,
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LapdmCtrl ctrl,
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LapdmLengthIndicator len
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} with { variant "" };
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external function enc_LapdmFrameA(in LapdmFrameA si) return octetstring
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with { extension "prototype(convert) encode(RAW)" };
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external function dec_LapdmFrameA(in octetstring stream) return LapdmFrameA
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with { extension "prototype(convert) decode(RAW)" };
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/* Formats B, Bter and B4 are used on DCCHs for frames containing an information field:
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/* - format Bter is used on request of higher layers if and only if short L2 header type 1 is
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* supported and a UI command is to be transmitted on SAPI 0 */
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/* - format B4 is used for UI frames transmitted by the network on SACCH; */
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/* - format B is applied in all other cases. */
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/* Format Bbis is used only on BCCH, PCH, NCH, and AGCH.
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/* Format B */
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type record LapdmFrameB {
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LapdmAddressField addr,
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LapdmCtrl ctrl,
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LapdmLengthIndicator len,
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octetstring payload
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} with { variant "" };
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external function enc_LapdmFrameB(in LapdmFrameB si) return octetstring
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with { extension "prototype(convert) encode(RAW)" };
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external function dec_LapdmFrameB(in octetstring stream) return LapdmFrameB
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with { extension "prototype(convert) decode(RAW)" };
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/* Format B4 */
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type record LapdmFrameB4 {
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LapdmAddressField addr,
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LapdmCtrl ctrl,
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octetstring payload
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} with { variant "" };
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external function enc_LapdmFrameB4(in LapdmFrameB4 si) return octetstring
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with { extension "prototype(convert) encode(RAW)" };
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external function dec_LapdmFrameB4(in octetstring stream) return LapdmFrameB4
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with { extension "prototype(convert) decode(RAW)" };
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} with { encode "RAW" };
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