| /* |
| * CAPI encoder/decoder for |
| * Portugal Telecom CAPI 2.0 |
| * |
| * Copyright (C) 1996 Universidade de Lisboa |
| * |
| * Written by Pedro Roque Marques (roque@di.fc.ul.pt) |
| * |
| * This software may be used and distributed according to the terms of |
| * the GNU General Public License, incorporated herein by reference. |
| * |
| * Not compatible with the AVM Gmbh. CAPI 2.0 |
| * |
| */ |
| |
| /* |
| * Documentation: |
| * - "Common ISDN API - Perfil Português - Versão 2.1", |
| * Telecom Portugal, Fev 1992. |
| * - "Common ISDN API - Especificação de protocolos para |
| * acesso aos canais B", Inesc, Jan 1994. |
| */ |
| |
| /* |
| * TODO: better decoding of Information Elements |
| * for debug purposes mainly |
| * encode our number in CallerPN and ConnectedPN |
| */ |
| |
| #include <linux/string.h> |
| #include <linux/kernel.h> |
| |
| #include <linux/types.h> |
| #include <linux/slab.h> |
| #include <linux/mm.h> |
| |
| #include <linux/skbuff.h> |
| |
| #include <asm/io.h> |
| #include <asm/string.h> |
| |
| #include <linux/isdnif.h> |
| |
| #include "pcbit.h" |
| #include "edss1.h" |
| #include "capi.h" |
| |
| |
| /* |
| * Encoding of CAPI messages |
| * |
| */ |
| |
| int capi_conn_req(const char *calledPN, struct sk_buff **skb, int proto) |
| { |
| ushort len; |
| |
| /* |
| * length |
| * AppInfoMask - 2 |
| * BC0 - 3 |
| * BC1 - 1 |
| * Chan - 2 |
| * Keypad - 1 |
| * CPN - 1 |
| * CPSA - 1 |
| * CalledPN - 2 + strlen |
| * CalledPSA - 1 |
| * rest... - 4 |
| * ---------------- |
| * Total 18 + strlen |
| */ |
| |
| len = 18 + strlen(calledPN); |
| |
| if (proto == ISDN_PROTO_L2_TRANS) |
| len++; |
| |
| if ((*skb = dev_alloc_skb(len)) == NULL) { |
| |
| printk(KERN_WARNING "capi_conn_req: alloc_skb failed\n"); |
| return -1; |
| } |
| |
| /* InfoElmMask */ |
| *((ushort *)skb_put(*skb, 2)) = AppInfoMask; |
| |
| if (proto == ISDN_PROTO_L2_TRANS) |
| { |
| /* Bearer Capability - Mandatory*/ |
| *(skb_put(*skb, 1)) = 3; /* BC0.Length */ |
| *(skb_put(*skb, 1)) = 0x80; /* Speech */ |
| *(skb_put(*skb, 1)) = 0x10; /* Circuit Mode */ |
| *(skb_put(*skb, 1)) = 0x23; /* A-law */ |
| } |
| else |
| { |
| /* Bearer Capability - Mandatory*/ |
| *(skb_put(*skb, 1)) = 2; /* BC0.Length */ |
| *(skb_put(*skb, 1)) = 0x88; /* Digital Information */ |
| *(skb_put(*skb, 1)) = 0x90; /* BC0.Octect4 */ |
| } |
| |
| /* Bearer Capability - Optional*/ |
| *(skb_put(*skb, 1)) = 0; /* BC1.Length = 0 */ |
| |
| *(skb_put(*skb, 1)) = 1; /* ChannelID.Length = 1 */ |
| *(skb_put(*skb, 1)) = 0x83; /* Basic Interface - Any Channel */ |
| |
| *(skb_put(*skb, 1)) = 0; /* Keypad.Length = 0 */ |
| |
| |
| *(skb_put(*skb, 1)) = 0; /* CallingPN.Length = 0 */ |
| *(skb_put(*skb, 1)) = 0; /* CallingPSA.Length = 0 */ |
| |
| /* Called Party Number */ |
| *(skb_put(*skb, 1)) = strlen(calledPN) + 1; |
| *(skb_put(*skb, 1)) = 0x81; |
| memcpy(skb_put(*skb, strlen(calledPN)), calledPN, strlen(calledPN)); |
| |
| /* '#' */ |
| |
| *(skb_put(*skb, 1)) = 0; /* CalledPSA.Length = 0 */ |
| |
| /* LLC.Length = 0; */ |
| /* HLC0.Length = 0; */ |
| /* HLC1.Length = 0; */ |
| /* UTUS.Length = 0; */ |
| memset(skb_put(*skb, 4), 0, 4); |
| |
| return len; |
| } |
| |
| int capi_conn_resp(struct pcbit_chan *chan, struct sk_buff **skb) |
| { |
| |
| if ((*skb = dev_alloc_skb(5)) == NULL) { |
| |
| printk(KERN_WARNING "capi_conn_resp: alloc_skb failed\n"); |
| return -1; |
| } |
| |
| *((ushort *)skb_put(*skb, 2)) = chan->callref; |
| *(skb_put(*skb, 1)) = 0x01; /* ACCEPT_CALL */ |
| *(skb_put(*skb, 1)) = 0; |
| *(skb_put(*skb, 1)) = 0; |
| |
| return 5; |
| } |
| |
| int capi_conn_active_req(struct pcbit_chan *chan, struct sk_buff **skb) |
| { |
| /* |
| * 8 bytes |
| */ |
| |
| if ((*skb = dev_alloc_skb(8)) == NULL) { |
| |
| printk(KERN_WARNING "capi_conn_active_req: alloc_skb failed\n"); |
| return -1; |
| } |
| |
| *((ushort *)skb_put(*skb, 2)) = chan->callref; |
| |
| #ifdef DEBUG |
| printk(KERN_DEBUG "Call Reference: %04x\n", chan->callref); |
| #endif |
| |
| *(skb_put(*skb, 1)) = 0; /* BC.Length = 0; */ |
| *(skb_put(*skb, 1)) = 0; /* ConnectedPN.Length = 0 */ |
| *(skb_put(*skb, 1)) = 0; /* PSA.Length */ |
| *(skb_put(*skb, 1)) = 0; /* LLC.Length = 0; */ |
| *(skb_put(*skb, 1)) = 0; /* HLC.Length = 0; */ |
| *(skb_put(*skb, 1)) = 0; /* UTUS.Length = 0; */ |
| |
| return 8; |
| } |
| |
| int capi_conn_active_resp(struct pcbit_chan *chan, struct sk_buff **skb) |
| { |
| /* |
| * 2 bytes |
| */ |
| |
| if ((*skb = dev_alloc_skb(2)) == NULL) { |
| |
| printk(KERN_WARNING "capi_conn_active_resp: alloc_skb failed\n"); |
| return -1; |
| } |
| |
| *((ushort *)skb_put(*skb, 2)) = chan->callref; |
| |
| return 2; |
| } |
| |
| |
| int capi_select_proto_req(struct pcbit_chan *chan, struct sk_buff **skb, |
| int outgoing) |
| { |
| |
| /* |
| * 18 bytes |
| */ |
| |
| if ((*skb = dev_alloc_skb(18)) == NULL) { |
| |
| printk(KERN_WARNING "capi_select_proto_req: alloc_skb failed\n"); |
| return -1; |
| } |
| |
| *((ushort *)skb_put(*skb, 2)) = chan->callref; |
| |
| /* Layer2 protocol */ |
| |
| switch (chan->proto) { |
| case ISDN_PROTO_L2_X75I: |
| *(skb_put(*skb, 1)) = 0x05; /* LAPB */ |
| break; |
| case ISDN_PROTO_L2_HDLC: |
| *(skb_put(*skb, 1)) = 0x02; |
| break; |
| case ISDN_PROTO_L2_TRANS: |
| /* |
| * Voice (a-law) |
| */ |
| *(skb_put(*skb, 1)) = 0x06; |
| break; |
| default: |
| #ifdef DEBUG |
| printk(KERN_DEBUG "Transparent\n"); |
| #endif |
| *(skb_put(*skb, 1)) = 0x03; |
| break; |
| } |
| |
| *(skb_put(*skb, 1)) = (outgoing ? 0x02 : 0x42); /* Don't ask */ |
| *(skb_put(*skb, 1)) = 0x00; |
| |
| *((ushort *) skb_put(*skb, 2)) = MRU; |
| |
| |
| *(skb_put(*skb, 1)) = 0x08; /* Modulo */ |
| *(skb_put(*skb, 1)) = 0x07; /* Max Window */ |
| |
| *(skb_put(*skb, 1)) = 0x01; /* No Layer3 Protocol */ |
| |
| /* |
| * 2 - layer3 MTU [10] |
| * - Modulo [12] |
| * - Window |
| * - layer1 proto [14] |
| * - bitrate |
| * - sub-channel [16] |
| * - layer1dataformat [17] |
| */ |
| |
| memset(skb_put(*skb, 8), 0, 8); |
| |
| return 18; |
| } |
| |
| |
| int capi_activate_transp_req(struct pcbit_chan *chan, struct sk_buff **skb) |
| { |
| |
| if ((*skb = dev_alloc_skb(7)) == NULL) { |
| |
| printk(KERN_WARNING "capi_activate_transp_req: alloc_skb failed\n"); |
| return -1; |
| } |
| |
| *((ushort *)skb_put(*skb, 2)) = chan->callref; |
| |
| |
| *(skb_put(*skb, 1)) = chan->layer2link; /* Layer2 id */ |
| *(skb_put(*skb, 1)) = 0x00; /* Transmit by default */ |
| |
| *((ushort *) skb_put(*skb, 2)) = MRU; |
| |
| *(skb_put(*skb, 1)) = 0x01; /* Enables reception*/ |
| |
| return 7; |
| } |
| |
| int capi_tdata_req(struct pcbit_chan *chan, struct sk_buff *skb) |
| { |
| ushort data_len; |
| |
| |
| /* |
| * callref - 2 |
| * layer2link - 1 |
| * wBlockLength - 2 |
| * data - 4 |
| * sernum - 1 |
| */ |
| |
| data_len = skb->len; |
| |
| if (skb_headroom(skb) < 10) |
| { |
| printk(KERN_CRIT "No headspace (%u) on headroom %p for capi header\n", skb_headroom(skb), skb); |
| } |
| else |
| { |
| skb_push(skb, 10); |
| } |
| |
| *((u16 *) (skb->data)) = chan->callref; |
| skb->data[2] = chan->layer2link; |
| *((u16 *) (skb->data + 3)) = data_len; |
| |
| chan->s_refnum = (chan->s_refnum + 1) % 8; |
| *((u32 *) (skb->data + 5)) = chan->s_refnum; |
| |
| skb->data[9] = 0; /* HDLC frame number */ |
| |
| return 10; |
| } |
| |
| int capi_tdata_resp(struct pcbit_chan *chan, struct sk_buff **skb) |
| |
| { |
| if ((*skb = dev_alloc_skb(4)) == NULL) { |
| |
| printk(KERN_WARNING "capi_tdata_resp: alloc_skb failed\n"); |
| return -1; |
| } |
| |
| *((ushort *)skb_put(*skb, 2)) = chan->callref; |
| |
| *(skb_put(*skb, 1)) = chan->layer2link; |
| *(skb_put(*skb, 1)) = chan->r_refnum; |
| |
| return (*skb)->len; |
| } |
| |
| int capi_disc_req(ushort callref, struct sk_buff **skb, u_char cause) |
| { |
| |
| if ((*skb = dev_alloc_skb(6)) == NULL) { |
| |
| printk(KERN_WARNING "capi_disc_req: alloc_skb failed\n"); |
| return -1; |
| } |
| |
| *((ushort *)skb_put(*skb, 2)) = callref; |
| |
| *(skb_put(*skb, 1)) = 2; /* Cause.Length = 2; */ |
| *(skb_put(*skb, 1)) = 0x80; |
| *(skb_put(*skb, 1)) = 0x80 | cause; |
| |
| /* |
| * Change it: we should send 'Sic transit gloria Mundi' here ;-) |
| */ |
| |
| *(skb_put(*skb, 1)) = 0; /* UTUS.Length = 0; */ |
| |
| return 6; |
| } |
| |
| int capi_disc_resp(struct pcbit_chan *chan, struct sk_buff **skb) |
| { |
| if ((*skb = dev_alloc_skb(2)) == NULL) { |
| |
| printk(KERN_WARNING "capi_disc_resp: alloc_skb failed\n"); |
| return -1; |
| } |
| |
| *((ushort *)skb_put(*skb, 2)) = chan->callref; |
| |
| return 2; |
| } |
| |
| |
| /* |
| * Decoding of CAPI messages |
| * |
| */ |
| |
| int capi_decode_conn_ind(struct pcbit_chan *chan, |
| struct sk_buff *skb, |
| struct callb_data *info) |
| { |
| int CIlen, len; |
| |
| /* Call Reference [CAPI] */ |
| chan->callref = *((ushort *)skb->data); |
| skb_pull(skb, 2); |
| |
| #ifdef DEBUG |
| printk(KERN_DEBUG "Call Reference: %04x\n", chan->callref); |
| #endif |
| |
| /* Channel Identification */ |
| |
| /* Expect |
| Len = 1 |
| Octect 3 = 0100 10CC - [ 7 Basic, 4 , 2-1 chan ] |
| */ |
| |
| CIlen = skb->data[0]; |
| #ifdef DEBUG |
| if (CIlen == 1) { |
| |
| if (((skb->data[1]) & 0xFC) == 0x48) |
| printk(KERN_DEBUG "decode_conn_ind: chan ok\n"); |
| printk(KERN_DEBUG "phyChan = %d\n", skb->data[1] & 0x03); |
| } |
| else |
| printk(KERN_DEBUG "conn_ind: CIlen = %d\n", CIlen); |
| #endif |
| skb_pull(skb, CIlen + 1); |
| |
| /* Calling Party Number */ |
| /* An "additional service" as far as Portugal Telecom is concerned */ |
| |
| len = skb->data[0]; |
| |
| if (len > 0) { |
| int count = 1; |
| |
| #ifdef DEBUG |
| printk(KERN_DEBUG "CPN: Octect 3 %02x\n", skb->data[1]); |
| #endif |
| if ((skb->data[1] & 0x80) == 0) |
| count = 2; |
| |
| if (!(info->data.setup.CallingPN = kmalloc(len - count + 1, GFP_ATOMIC))) |
| return -1; |
| |
| skb_copy_from_linear_data_offset(skb, count + 1, |
| info->data.setup.CallingPN, |
| len - count); |
| info->data.setup.CallingPN[len - count] = 0; |
| |
| } |
| else { |
| info->data.setup.CallingPN = NULL; |
| printk(KERN_DEBUG "NULL CallingPN\n"); |
| } |
| |
| skb_pull(skb, len + 1); |
| |
| /* Calling Party Subaddress */ |
| skb_pull(skb, skb->data[0] + 1); |
| |
| /* Called Party Number */ |
| |
| len = skb->data[0]; |
| |
| if (len > 0) { |
| int count = 1; |
| |
| if ((skb->data[1] & 0x80) == 0) |
| count = 2; |
| |
| if (!(info->data.setup.CalledPN = kmalloc(len - count + 1, GFP_ATOMIC))) |
| return -1; |
| |
| skb_copy_from_linear_data_offset(skb, count + 1, |
| info->data.setup.CalledPN, |
| len - count); |
| info->data.setup.CalledPN[len - count] = 0; |
| |
| } |
| else { |
| info->data.setup.CalledPN = NULL; |
| printk(KERN_DEBUG "NULL CalledPN\n"); |
| } |
| |
| skb_pull(skb, len + 1); |
| |
| /* Called Party Subaddress */ |
| skb_pull(skb, skb->data[0] + 1); |
| |
| /* LLC */ |
| skb_pull(skb, skb->data[0] + 1); |
| |
| /* HLC */ |
| skb_pull(skb, skb->data[0] + 1); |
| |
| /* U2U */ |
| skb_pull(skb, skb->data[0] + 1); |
| |
| return 0; |
| } |
| |
| /* |
| * returns errcode |
| */ |
| |
| int capi_decode_conn_conf(struct pcbit_chan *chan, struct sk_buff *skb, |
| int *complete) |
| { |
| int errcode; |
| |
| chan->callref = *((ushort *)skb->data); /* Update CallReference */ |
| skb_pull(skb, 2); |
| |
| errcode = *((ushort *) skb->data); /* read errcode */ |
| skb_pull(skb, 2); |
| |
| *complete = *(skb->data); |
| skb_pull(skb, 1); |
| |
| /* FIX ME */ |
| /* This is actually a firmware bug */ |
| if (!*complete) |
| { |
| printk(KERN_DEBUG "complete=%02x\n", *complete); |
| *complete = 1; |
| } |
| |
| |
| /* Optional Bearer Capability */ |
| skb_pull(skb, *(skb->data) + 1); |
| |
| /* Channel Identification */ |
| skb_pull(skb, *(skb->data) + 1); |
| |
| /* High Layer Compatibility follows */ |
| skb_pull(skb, *(skb->data) + 1); |
| |
| return errcode; |
| } |
| |
| int capi_decode_conn_actv_ind(struct pcbit_chan *chan, struct sk_buff *skb) |
| { |
| ushort len; |
| #ifdef DEBUG |
| char str[32]; |
| #endif |
| |
| /* Yet Another Bearer Capability */ |
| skb_pull(skb, *(skb->data) + 1); |
| |
| |
| /* Connected Party Number */ |
| len = *(skb->data); |
| |
| #ifdef DEBUG |
| if (len > 1 && len < 31) { |
| skb_copy_from_linear_data_offset(skb, 2, str, len - 1); |
| str[len] = 0; |
| printk(KERN_DEBUG "Connected Party Number: %s\n", str); |
| } |
| else |
| printk(KERN_DEBUG "actv_ind CPN len = %d\n", len); |
| #endif |
| |
| skb_pull(skb, len + 1); |
| |
| /* Connected Subaddress */ |
| skb_pull(skb, *(skb->data) + 1); |
| |
| /* Low Layer Capability */ |
| skb_pull(skb, *(skb->data) + 1); |
| |
| /* High Layer Capability */ |
| skb_pull(skb, *(skb->data) + 1); |
| |
| return 0; |
| } |
| |
| int capi_decode_conn_actv_conf(struct pcbit_chan *chan, struct sk_buff *skb) |
| { |
| ushort errcode; |
| |
| errcode = *((ushort *)skb->data); |
| skb_pull(skb, 2); |
| |
| /* Channel Identification |
| skb_pull(skb, skb->data[0] + 1); |
| */ |
| return errcode; |
| } |
| |
| |
| int capi_decode_sel_proto_conf(struct pcbit_chan *chan, struct sk_buff *skb) |
| { |
| ushort errcode; |
| |
| chan->layer2link = *(skb->data); |
| skb_pull(skb, 1); |
| |
| errcode = *((ushort *)skb->data); |
| skb_pull(skb, 2); |
| |
| return errcode; |
| } |
| |
| int capi_decode_actv_trans_conf(struct pcbit_chan *chan, struct sk_buff *skb) |
| { |
| ushort errcode; |
| |
| if (chan->layer2link != *(skb->data)) |
| printk("capi_decode_actv_trans_conf: layer2link doesn't match\n"); |
| |
| skb_pull(skb, 1); |
| |
| errcode = *((ushort *)skb->data); |
| skb_pull(skb, 2); |
| |
| return errcode; |
| } |
| |
| int capi_decode_disc_ind(struct pcbit_chan *chan, struct sk_buff *skb) |
| { |
| ushort len; |
| #ifdef DEBUG |
| int i; |
| #endif |
| /* Cause */ |
| |
| len = *(skb->data); |
| skb_pull(skb, 1); |
| |
| #ifdef DEBUG |
| |
| for (i = 0; i < len; i++) |
| printk(KERN_DEBUG "Cause Octect %d: %02x\n", i + 3, |
| *(skb->data + i)); |
| #endif |
| |
| skb_pull(skb, len); |
| |
| return 0; |
| } |
| |
| #ifdef DEBUG |
| int capi_decode_debug_188(u_char *hdr, ushort hdrlen) |
| { |
| char str[64]; |
| int len; |
| |
| len = hdr[0]; |
| |
| if (len < 64 && len == hdrlen - 1) { |
| memcpy(str, hdr + 1, hdrlen - 1); |
| str[hdrlen - 1] = 0; |
| printk("%s\n", str); |
| } |
| else |
| printk("debug message incorrect\n"); |
| |
| return 0; |
| } |
| #endif |
