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Diffstat (limited to 'net/irda/parameters.c')
| -rw-r--r-- | net/irda/parameters.c | 584 |
1 files changed, 0 insertions, 584 deletions
diff --git a/net/irda/parameters.c b/net/irda/parameters.c deleted file mode 100644 index 16ce32ffe004..000000000000 --- a/net/irda/parameters.c +++ /dev/null @@ -1,584 +0,0 @@ -/********************************************************************* - * - * 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, see <http://www.gnu.org/licenses/>. - * - ********************************************************************/ - -#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 const 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 const 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 length 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 length 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) { - pr_debug("%s(), using 1 byte\n", __func__); - p.pl = 1; - } else if (p.pv.i < 0xffff) { - pr_debug("%s(), using 2 bytes\n", __func__); - p.pl = 2; - } else { - pr_debug("%s(), using 4 bytes\n", __func__); - p.pl = 4; /* Default length */ - } - } - /* Check if buffer is long enough for insertion */ - if (len < (2+p.pl)) { - net_warn_ratelimited("%s: buffer too short for insertion!\n", - __func__); - return -1; - } - pr_debug("%s(), pi=%#x, pl=%d, pi=%d\n", __func__, - 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: - net_warn_ratelimited("%s: length %d not supported\n", - __func__, 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 length we extract */ - int err; - - p.pi = pi; /* In case handler needs to know */ - p.pl = buf[1]; /* Extract length 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)) { - net_warn_ratelimited("%s: buffer too short for parsing! Need %d bytes, but len is only %d\n", - __func__, 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)) { - net_err_ratelimited("%s: invalid parameter length! Expected %d bytes, but value had %d bytes!\n", - __func__, 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: - net_warn_ratelimited("%s: length %d not supported\n", - __func__, p.pl); - - /* Skip parameter */ - return p.pl+2; - } - - pr_debug("%s(), pi=%#x, pl=%d, pi=%d\n", __func__, - 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; - - p.pi = pi; /* In case handler needs to know */ - p.pl = buf[1]; /* Extract length of value */ - if (p.pl > 32) - p.pl = 32; - - pr_debug("%s(), pi=%#x, pl=%d\n", __func__, - p.pi, p.pl); - - /* Check if buffer is long enough for parsing */ - if (len < (2+p.pl)) { - net_warn_ratelimited("%s: buffer too short for parsing! Need %d bytes, but len is only %d\n", - __func__, 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); - - pr_debug("%s(), str=0x%02x 0x%02x\n", - __func__, (__u8)str[0], (__u8)str[1]); - - /* Null terminate string */ - str[p.pl] = '\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 length of value */ - - /* Check if buffer is long enough for parsing */ - if (len < (2+p.pl)) { - net_warn_ratelimited("%s: buffer too short for parsing! Need %d bytes, but len is only %d\n", - __func__, p.pl, len); - return -1; - } - - pr_debug("%s(), not impl\n", __func__); - - 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) -{ - const 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 != NULL, 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)) - { - pr_debug("%s(), no handler for parameter=0x%02x\n", - __func__, 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) { - net_info_ratelimited("%s: no handler for pi=%#x\n", - __func__, 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); - -/* - * Function irda_param_extract (self, buf, len, info) - * - * Parse all parameters. If len is correct, then everything should be - * safe. Returns the number of bytes that was parsed - * - */ -static int irda_param_extract(void *self, __u8 *buf, int len, - pi_param_info_t *info) -{ - const 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 != NULL, return ret;); - - pi_minor = buf[n] & info->pi_mask; - pi_major = buf[n] >> 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)) - { - pr_debug("%s(), no handler for parameter=0x%02x\n", - __func__, buf[0]); - - /* Skip this parameter */ - return 2 + buf[n + 1]; /* Continue */ - } - - /* 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; - - pr_debug("%s(), pi=[%d,%d], type=%d\n", __func__, - pi_major, pi_minor, type); - - /* Check if handler has been implemented */ - if (!pi_minor_info->func) { - net_info_ratelimited("%s: no handler for pi=%#x\n", - __func__, buf[n]); - /* Skip this parameter */ - return 2 + buf[n + 1]; /* Continue */ - } - - /* Parse parameter value */ - ret = (*pv_extract_table[type & PV_MASK])(self, buf+n, len, buf[n], - type, pi_minor_info->func); - return ret; -} - -/* - * Function irda_param_extract_all (self, buf, len, info) - * - * Parse all parameters. If len is correct, then everything should be - * safe. Returns the number of bytes that was parsed - * - */ -int irda_param_extract_all(void *self, __u8 *buf, int len, - pi_param_info_t *info) -{ - int ret = -1; - int n = 0; - - IRDA_ASSERT(buf != NULL, return ret;); - IRDA_ASSERT(info != NULL, return ret;); - - /* - * Parse all parameters. Each parameter must be at least two bytes - * long or else there is no point in trying to parse it - */ - while (len > 2) { - ret = irda_param_extract(self, buf+n, len, info); - if (ret < 0) - return ret; - - n += ret; - len -= ret; - } - return n; -} -EXPORT_SYMBOL(irda_param_extract_all); |