/********************************************************************* * * Filename:      parameters.c * Version:       1.0 * Description:   A more general way to handle (pi,pl,pv) parameters * Status:        Experimental. * Author:        Dag Brattli <dagb@cs.uit.no> * Created at:    Mon Jun  7 10:25:11 1999 * Modified at:   Sun Jan 30 14:08:39 2000 * Modified by:   Dag Brattli <dagb@cs.uit.no> * *     Copyright (c) 1999-2000 Dag Brattli, All Rights Reserved. * *     This program is free software; you can redistribute it and/or *     modify it under the terms of the GNU General Public License as *     published by the Free Software Foundation; either version 2 of *     the License, or (at your option) any later version. * *     This program is distributed in the hope that it will be useful, *     but WITHOUT ANY WARRANTY; without even the implied warranty of *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *     GNU General Public License for more details. * *     You should have received a copy of the GNU General Public License *     along with this program; if not, write to the Free Software *     Foundation, Inc., 59 Temple Place, Suite 330, Boston, *     MA 02111-1307 USA * ********************************************************************/ #include <linux/types.h>#include <linux/module.h> #include <asm/unaligned.h>#include <asm/byteorder.h> #include <net/irda/irda.h>#include <net/irda/parameters.h> static int irda_extract_integer(void *self, __u8 *buf, int len, __u8 pi,				PV_TYPE type, PI_HANDLER func);static int irda_extract_string(void *self, __u8 *buf, int len, __u8 pi,			       PV_TYPE type, PI_HANDLER func);static int irda_extract_octseq(void *self, __u8 *buf, int len, __u8 pi,			       PV_TYPE type, PI_HANDLER func);static int irda_extract_no_value(void *self, __u8 *buf, int len, __u8 pi,				 PV_TYPE type, PI_HANDLER func); static int irda_insert_integer(void *self, __u8 *buf, int len, __u8 pi,			       PV_TYPE type, PI_HANDLER func);static int irda_insert_no_value(void *self, __u8 *buf, int len, __u8 pi,				PV_TYPE type, PI_HANDLER func); static int irda_param_unpack(__u8 *buf, char *fmt, ...); /* Parameter value call table. Must match PV_TYPE */static PV_HANDLER pv_extract_table[] = {	irda_extract_integer, /* Handler for any length integers */	irda_extract_integer, /* Handler for 8  bits integers */	irda_extract_integer, /* Handler for 16 bits integers */	irda_extract_string,  /* Handler for strings */	irda_extract_integer, /* Handler for 32 bits integers */	irda_extract_octseq,  /* Handler for octet sequences */	irda_extract_no_value /* Handler for no value parameters */}; static PV_HANDLER pv_insert_table[] = {	irda_insert_integer, /* Handler for any length integers */	irda_insert_integer, /* Handler for 8  bits integers */	irda_insert_integer, /* Handler for 16 bits integers */	NULL,                /* Handler for strings */	irda_insert_integer, /* Handler for 32 bits integers */	NULL,                /* Handler for octet sequences */	irda_insert_no_value /* Handler for no value parameters */}; /* * Function irda_insert_no_value (self, buf, len, pi, type, func) */static int irda_insert_no_value(void *self, __u8 *buf, int len, __u8 pi,				PV_TYPE type, PI_HANDLER func){	irda_param_t p;	int ret; 	p.pi = pi;	p.pl = 0; 	/* Call handler for this parameter */	ret = (*func)(self, &p, PV_GET); 	/* Extract values anyway, since handler may need them */	irda_param_pack(buf, "bb", p.pi, p.pl); 	if (ret < 0)		return ret; 	return 2; /* Inserted pl+2 bytes */} /* * Function irda_extract_no_value (self, buf, len, type, func) * *    Extracts a parameter without a pv field (pl=0) * */static int irda_extract_no_value(void *self, __u8 *buf, int len, __u8 pi,				 PV_TYPE type, PI_HANDLER func){	irda_param_t p;	int ret; 	/* Extract values anyway, since handler may need them */	irda_param_unpack(buf, "bb", &p.pi, &p.pl); 	/* Call handler for this parameter */	ret = (*func)(self, &p, PV_PUT); 	if (ret < 0)		return ret; 	return 2; /* Extracted pl+2 bytes */} /* * Function irda_insert_integer (self, buf, len, pi, type, func) */static int irda_insert_integer(void *self, __u8 *buf, int len, __u8 pi,			       PV_TYPE type, PI_HANDLER func){	irda_param_t p;	int n = 0;	int err; 	p.pi = pi;             /* In case handler needs to know */	p.pl = type & PV_MASK; /* The integer type codes the lenght as well */	p.pv.i = 0;            /* Clear value */ 	/* Call handler for this parameter */	err = (*func)(self, &p, PV_GET);	if (err < 0)		return err; 	/*	 * If parameter lenght is still 0, then (1) this is an any length	 * integer, and (2) the handler function does not care which length	 * we choose to use, so we pick the one the gives the fewest bytes.	 */	if (p.pl == 0) {		if (p.pv.i < 0xff) {			IRDA_DEBUG(2, "%s(), using 1 byte\n", __FUNCTION__);			p.pl = 1;		} else if (p.pv.i < 0xffff) {			IRDA_DEBUG(2, "%s(), using 2 bytes\n", __FUNCTION__);			p.pl = 2;		} else {			IRDA_DEBUG(2, "%s(), using 4 bytes\n", __FUNCTION__);			p.pl = 4; /* Default length */		}	}	/* Check if buffer is long enough for insertion */	if (len < (2+p.pl)) {		IRDA_WARNING("%s: buffer to short for insertion!\n",			     __FUNCTION__);		return -1;	}	IRDA_DEBUG(2, "%s(), pi=%#x, pl=%d, pi=%d\n", __FUNCTION__,		   p.pi, p.pl, p.pv.i);	switch (p.pl) {	case 1:		n += irda_param_pack(buf, "bbb", p.pi, p.pl, (__u8) p.pv.i);		break;	case 2:		if (type & PV_BIG_ENDIAN)			p.pv.i = cpu_to_be16((__u16) p.pv.i);		else			p.pv.i = cpu_to_le16((__u16) p.pv.i);		n += irda_param_pack(buf, "bbs", p.pi, p.pl, (__u16) p.pv.i);		break;	case 4:		if (type & PV_BIG_ENDIAN)			cpu_to_be32s(&p.pv.i);		else			cpu_to_le32s(&p.pv.i);		n += irda_param_pack(buf, "bbi", p.pi, p.pl, p.pv.i); 		break;	default:		IRDA_WARNING("%s: length %d not supported\n",			     __FUNCTION__, p.pl);		/* Skip parameter */		return -1;	} 	return p.pl+2; /* Inserted pl+2 bytes */} /* * Function irda_extract integer (self, buf, len, pi, type, func) * *    Extract a possibly variable length integer from buffer, and call *    handler for processing of the parameter */static int irda_extract_integer(void *self, __u8 *buf, int len, __u8 pi,				PV_TYPE type, PI_HANDLER func){	irda_param_t p;	int n = 0;	int extract_len;	/* Real lenght we extract */	int err; 	p.pi = pi;     /* In case handler needs to know */	p.pl = buf[1]; /* Extract lenght of value */	p.pv.i = 0;    /* Clear value */	extract_len = p.pl;	/* Default : extract all */ 	/* Check if buffer is long enough for parsing */	if (len < (2+p.pl)) {		IRDA_WARNING("%s: buffer to short for parsing! "			     "Need %d bytes, but len is only %d\n",			     __FUNCTION__, p.pl, len);		return -1;	} 	/*	 * Check that the integer length is what we expect it to be. If the	 * handler want a 16 bits integer then a 32 bits is not good enough	 * PV_INTEGER means that the handler is flexible.	 */	if (((type & PV_MASK) != PV_INTEGER) && ((type & PV_MASK) != p.pl)) {		IRDA_ERROR("%s: invalid parameter length! "			   "Expected %d bytes, but value had %d bytes!\n",			   __FUNCTION__, type & PV_MASK, p.pl); 		/* Most parameters are bit/byte fields or little endian,		 * so it's ok to only extract a subset of it (the subset		 * that the handler expect). This is necessary, as some		 * broken implementations seems to add extra undefined bits.		 * If the parameter is shorter than we expect or is big		 * endian, we can't play those tricks. Jean II */		if((p.pl < (type & PV_MASK)) || (type & PV_BIG_ENDIAN)) {			/* Skip parameter */			return p.pl+2;		} else {			/* Extract subset of it, fallthrough */			extract_len = type & PV_MASK;		}	}  	switch (extract_len) {	case 1:		n += irda_param_unpack(buf+2, "b", &p.pv.i);		break;	case 2:		n += irda_param_unpack(buf+2, "s", &p.pv.i);		if (type & PV_BIG_ENDIAN)			p.pv.i = be16_to_cpu((__u16) p.pv.i);		else			p.pv.i = le16_to_cpu((__u16) p.pv.i);		break;	case 4:		n += irda_param_unpack(buf+2, "i", &p.pv.i);		if (type & PV_BIG_ENDIAN)			be32_to_cpus(&p.pv.i);		else			le32_to_cpus(&p.pv.i);		break;	default:		IRDA_WARNING("%s: length %d not supported\n",			     __FUNCTION__, p.pl); 		/* Skip parameter */		return p.pl+2;	} 	IRDA_DEBUG(2, "%s(), pi=%#x, pl=%d, pi=%d\n", __FUNCTION__,		   p.pi, p.pl, p.pv.i);	/* Call handler for this parameter */	err = (*func)(self, &p, PV_PUT);	if (err < 0)		return err; 	return p.pl+2; /* Extracted pl+2 bytes */} /* * Function irda_extract_string (self, buf, len, type, func) */static int irda_extract_string(void *self, __u8 *buf, int len, __u8 pi,			       PV_TYPE type, PI_HANDLER func){	char str[33];	irda_param_t p;	int err; 	IRDA_DEBUG(2, "%s()\n", __FUNCTION__); 	p.pi = pi;     /* In case handler needs to know */	p.pl = buf[1]; /* Extract lenght of value */ 	IRDA_DEBUG(2, "%s(), pi=%#x, pl=%d\n", __FUNCTION__,		   p.pi, p.pl); 	/* Check if buffer is long enough for parsing */	if (len < (2+p.pl)) {		IRDA_WARNING("%s: buffer to short for parsing! "			     "Need %d bytes, but len is only %d\n",			     __FUNCTION__, p.pl, len);		return -1;	} 	/* Should be safe to copy string like this since we have already	 * checked that the buffer is long enough */	strncpy(str, buf+2, p.pl); 	IRDA_DEBUG(2, "%s(), str=0x%02x 0x%02x\n", __FUNCTION__,		   (__u8) str[0], (__u8) str[1]); 	/* Null terminate string */	str[p.pl+1] = '\0'; 	p.pv.c = str; /* Handler will need to take a copy */ 	/* Call handler for this parameter */	err = (*func)(self, &p, PV_PUT);	if (err < 0)		return err; 	return p.pl+2; /* Extracted pl+2 bytes */} /* * Function irda_extract_octseq (self, buf, len, type, func) */static int irda_extract_octseq(void *self, __u8 *buf, int len, __u8 pi,			       PV_TYPE type, PI_HANDLER func){	irda_param_t p; 	p.pi = pi;     /* In case handler needs to know */	p.pl = buf[1]; /* Extract lenght of value */ 	/* Check if buffer is long enough for parsing */	if (len < (2+p.pl)) {		IRDA_WARNING("%s: buffer to short for parsing! "			     "Need %d bytes, but len is only %d\n",			     __FUNCTION__, p.pl, len);		return -1;	} 	IRDA_DEBUG(0, "%s(), not impl\n", __FUNCTION__); 	return p.pl+2; /* Extracted pl+2 bytes */} /* * Function irda_param_pack (skb, fmt, ...) * *    Format: *        'i' = 32 bits integer *        's' = string * */int irda_param_pack(__u8 *buf, char *fmt, ...){	irda_pv_t arg;	va_list args;	char *p;	int n = 0; 	va_start(args, fmt); 	for (p = fmt; *p != '\0'; p++) {		switch (*p) {		case 'b':  /* 8 bits unsigned byte */			buf[n++] = (__u8)va_arg(args, int);			break;		case 's':  /* 16 bits unsigned short */			arg.i = (__u16)va_arg(args, int);			put_unaligned((__u16)arg.i, (__u16 *)(buf+n)); n+=2;			break;		case 'i':  /* 32 bits unsigned integer */			arg.i = va_arg(args, __u32);			put_unaligned(arg.i, (__u32 *)(buf+n)); n+=4;			break;#if 0		case 'c': /* \0 terminated string */			arg.c = va_arg(args, char *);			strcpy(buf+n, arg.c);			n += strlen(arg.c) + 1;			break;#endif		default:			va_end(args);			return -1;		}	}	va_end(args); 	return 0;}EXPORT_SYMBOL(irda_param_pack); /* * Function irda_param_unpack (skb, fmt, ...) */static int irda_param_unpack(__u8 *buf, char *fmt, ...){	irda_pv_t arg;	va_list args;	char *p;	int n = 0; 	va_start(args, fmt); 	for (p = fmt; *p != '\0'; p++) {		switch (*p) {		case 'b':  /* 8 bits byte */			arg.ip = va_arg(args, __u32 *);			*arg.ip = buf[n++];			break;		case 's':  /* 16 bits short */			arg.ip = va_arg(args, __u32 *);			*arg.ip = get_unaligned((__u16 *)(buf+n)); n+=2;			break;		case 'i':  /* 32 bits unsigned integer */			arg.ip = va_arg(args, __u32 *);			*arg.ip = get_unaligned((__u32 *)(buf+n)); n+=4;			break;#if 0		case 'c':   /* \0 terminated string */			arg.c = va_arg(args, char *);			strcpy(arg.c, buf+n);			n += strlen(arg.c) + 1;			break;#endif		default:			va_end(args);			return -1;		} 	}	va_end(args); 	return 0;} /* * Function irda_param_insert (self, pi, buf, len, info) * *    Insert the specified parameter (pi) into buffer. Returns number of *    bytes inserted */int irda_param_insert(void *self, __u8 pi, __u8 *buf, int len,		      pi_param_info_t *info){	pi_minor_info_t *pi_minor_info;	__u8 pi_minor;	__u8 pi_major;	int type;	int ret = -1;	int n = 0; 	IRDA_ASSERT(buf != NULL, return ret;);	IRDA_ASSERT(info != 0, return ret;); 	pi_minor = pi & info->pi_mask;	pi_major = pi >> info->pi_major_offset; 	/* Check if the identifier value (pi) is valid */	if ((pi_major > info->len-1) ||	    (pi_minor > info->tables[pi_major].len-1))	{		IRDA_DEBUG(0, "%s(), no handler for parameter=0x%02x\n",			   __FUNCTION__, pi); 		/* Skip this parameter */		return -1;	} 	/* Lookup the info on how to parse this parameter */	pi_minor_info = &info->tables[pi_major].pi_minor_call_table[pi_minor]; 	/* Find expected data type for this parameter identifier (pi)*/	type = pi_minor_info->type; 	/*  Check if handler has been implemented */	if (!pi_minor_info->func) {		IRDA_MESSAGE("%s: no handler for pi=%#x\n", __FUNCTION__, pi);		/* Skip this parameter */		return -1;	} 	/* Insert parameter value */	ret = (*pv_insert_table[type & PV_MASK])(self, buf+n, len, pi, type,						 pi_minor_info->func);	return ret;}EXPORT_SYMBOL(irda_param_insert);

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