net: remove ISDN subsystem and Bluetooth CMTP

Remove the ISDN (mISDN, CAPI) subsystem and Bluetooth CMTP protocol
from the kernel tree.

ISDN is a pretty old technology and it's unclear whether anyone still
uses it. I went over the last few years of git history and all the
commits are either tree-wide conversions or syzbot/static analyzer
fixes.

When we discussed removal in the past IIRC there were some concerns
about ISDN still being used in parts of Germany. Unfortunately, the
code base is quite old, none of the current maintainers are familiar
with it and AI tools will have a field day finding bugs here.

Delete this code and preserve it in an out-of-tree repository
for any remaining users:
https://github.com/linux-netdev/mod-orphan

UAPI constants AF_ISDN/PF_ISDN and the SELinux isdn_socket class
are preserved for ABI stability, but the rest of uAPI is removed.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Stephen Hemminger <stephen@networkplumber.org>
Acked-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20260421022108.1299678-1-kuba@kernel.org
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

2 files changed, 0 insertions, 155 deletions

diff --git a/include/linux/isdn/capilli.h b/include/linux/isdn/capilli.h
deleted file mode 100644
index 12be09b6883b..000000000000
--- a/include/linux/isdn/capilli.h
+++ /dev/null
@@ -1,95 +0,0 @@
-/* $Id: capilli.h,v 1.1.2.2 2004/01/16 21:09:27 keil Exp $
- * 
- * Kernel CAPI 2.0 Driver Interface for Linux
- * 
- * Copyright 1999 by Carsten Paeth <calle@calle.de>
- * 
- * This software may be used and distributed according to the terms
- * of the GNU General Public License, incorporated herein by reference.
- *
- */
-
-#ifndef __CAPILLI_H__
-#define __CAPILLI_H__
-
-#include <linux/kernel.h>
-#include <linux/list.h>
-#include <linux/capi.h>
-#include <linux/kernelcapi.h>
-
-typedef struct capiloaddatapart {
-	int user;		/* data in userspace ? */
-	int len;
-	unsigned char *data;
-} capiloaddatapart;
-
-typedef struct capiloaddata {
-	capiloaddatapart firmware;
-	capiloaddatapart configuration;
-} capiloaddata;
-
-typedef struct capicardparams {
-	unsigned int port;
-	unsigned irq;
-	int cardtype;
-	int cardnr;
-	unsigned int membase;
-} capicardparams;
-
-struct capi_ctr {
-	/* filled in before calling attach_capi_ctr */
-	struct module *owner;
-	void *driverdata;			/* driver specific */
-	char name[32];				/* name of controller */
-	char *driver_name;			/* name of driver */
-	int (*load_firmware)(struct capi_ctr *, capiloaddata *);
-	void (*reset_ctr)(struct capi_ctr *);
-	void (*register_appl)(struct capi_ctr *, u16 appl,
-			      capi_register_params *);
-	void (*release_appl)(struct capi_ctr *, u16 appl);
-	u16  (*send_message)(struct capi_ctr *, struct sk_buff *skb);
-	
-	char *(*procinfo)(struct capi_ctr *);
-	int (*proc_show)(struct seq_file *, void *);
-
-	/* filled in before calling ready callback */
-	u8 manu[CAPI_MANUFACTURER_LEN];		/* CAPI_GET_MANUFACTURER */
-	capi_version version;			/* CAPI_GET_VERSION */
-	capi_profile profile;			/* CAPI_GET_PROFILE */
-	u8 serial[CAPI_SERIAL_LEN];		/* CAPI_GET_SERIAL */
-
-	/* management information for kcapi */
-
-	unsigned long nrecvctlpkt;
-	unsigned long nrecvdatapkt;
-	unsigned long nsentctlpkt;
-	unsigned long nsentdatapkt;
-
-	int cnr;				/* controller number */
-	unsigned short state;			/* controller state */
-	int blocked;				/* output blocked */
-	int traceflag;				/* capi trace */
-
-	struct proc_dir_entry *procent;
-        char procfn[128];
-};
-
-int attach_capi_ctr(struct capi_ctr *);
-int detach_capi_ctr(struct capi_ctr *);
-
-void capi_ctr_ready(struct capi_ctr * card);
-void capi_ctr_down(struct capi_ctr * card);
-void capi_ctr_handle_message(struct capi_ctr * card, u16 appl, struct sk_buff *skb);
-
-// ---------------------------------------------------------------------------
-// needed for AVM capi drivers
-
-struct capi_driver {
-	char name[32];				/* driver name */
-	char revision[32];
-
-	/* management information for kcapi */
-	struct list_head list; 
-};
-
-#endif				/* __CAPILLI_H__ */
diff --git a/include/linux/isdn/capiutil.h b/include/linux/isdn/capiutil.h
deleted file mode 100644
index 953fd500dff7..000000000000
--- a/include/linux/isdn/capiutil.h
+++ /dev/null
@@ -1,60 +0,0 @@
-/* $Id: capiutil.h,v 1.5.6.2 2001/09/23 22:24:33 kai Exp $
- *
- * CAPI 2.0 defines & types
- *
- * From CAPI 2.0 Development Kit AVM 1995 (msg.c)
- * Rewritten for Linux 1996 by Carsten Paeth <calle@calle.de>
- *
- * This software may be used and distributed according to the terms
- * of the GNU General Public License, incorporated herein by reference.
- *
- */
-
-#ifndef __CAPIUTIL_H__
-#define __CAPIUTIL_H__
-
-#include <asm/types.h>
-
-#define CAPIMSG_BASELEN		8
-#define CAPIMSG_U8(m, off)	(m[off])
-#define CAPIMSG_U16(m, off)	(m[off]|(m[(off)+1]<<8))
-#define CAPIMSG_U32(m, off)	(m[off]|(m[(off)+1]<<8)|(m[(off)+2]<<16)|(m[(off)+3]<<24))
-#define	CAPIMSG_LEN(m)		CAPIMSG_U16(m,0)
-#define	CAPIMSG_APPID(m)	CAPIMSG_U16(m,2)
-#define	CAPIMSG_COMMAND(m)	CAPIMSG_U8(m,4)
-#define	CAPIMSG_SUBCOMMAND(m)	CAPIMSG_U8(m,5)
-#define CAPIMSG_CMD(m)		(((m[4])<<8)|(m[5]))
-#define	CAPIMSG_MSGID(m)	CAPIMSG_U16(m,6)
-#define CAPIMSG_CONTROLLER(m)	(m[8] & 0x7f)
-#define CAPIMSG_CONTROL(m)	CAPIMSG_U32(m, 8)
-#define CAPIMSG_NCCI(m)		CAPIMSG_CONTROL(m)
-#define CAPIMSG_DATALEN(m)	CAPIMSG_U16(m,16) /* DATA_B3_REQ */
-
-static inline void capimsg_setu8(void *m, int off, __u8 val)
-{
-	((__u8 *)m)[off] = val;
-}
-
-static inline void capimsg_setu16(void *m, int off, __u16 val)
-{
-	((__u8 *)m)[off] = val & 0xff;
-	((__u8 *)m)[off+1] = (val >> 8) & 0xff;
-}
-
-static inline void capimsg_setu32(void *m, int off, __u32 val)
-{
-	((__u8 *)m)[off] = val & 0xff;
-	((__u8 *)m)[off+1] = (val >> 8) & 0xff;
-	((__u8 *)m)[off+2] = (val >> 16) & 0xff;
-	((__u8 *)m)[off+3] = (val >> 24) & 0xff;
-}
-
-#define	CAPIMSG_SETLEN(m, len)		capimsg_setu16(m, 0, len)
-#define	CAPIMSG_SETAPPID(m, applid)	capimsg_setu16(m, 2, applid)
-#define	CAPIMSG_SETCOMMAND(m,cmd)	capimsg_setu8(m, 4, cmd)
-#define	CAPIMSG_SETSUBCOMMAND(m, cmd)	capimsg_setu8(m, 5, cmd)
-#define	CAPIMSG_SETMSGID(m, msgid)	capimsg_setu16(m, 6, msgid)
-#define	CAPIMSG_SETCONTROL(m, contr)	capimsg_setu32(m, 8, contr)
-#define	CAPIMSG_SETDATALEN(m, len)	capimsg_setu16(m, 16, len)
-
-#endif				/* __CAPIUTIL_H__ */