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Fix some spelling mistakes in comments: permanentely ==> permanently wont ==> won't remaning ==> remaining succed ==> succeed shouldnt ==> shouldn't alpha-numeric ==> alphanumeric storeing ==> storing funtion ==> function documenation ==> documentation Determin ==> Determine intepreted ==> interpreted ammount ==> amount obious ==> obvious interupts ==> interrupts occured ==> occurred asssociated ==> associated taking into acount ==> taking into account squence ==> sequence stil ==> still contiguos ==> contiguous matchs ==> matches Link: https://lkml.kernel.org/r/20210607072555.12416-1-thunder.leizhen@huawei.com Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com> Reviewed-by: Jacob Keller <jacob.e.keller@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
200 lines
4.4 KiB
C
200 lines
4.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* ASN.1 Object identifier (OID) registry
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*
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* Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*/
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#include <linux/module.h>
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#include <linux/export.h>
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#include <linux/oid_registry.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/bug.h>
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#include <linux/asn1.h>
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#include "oid_registry_data.c"
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MODULE_DESCRIPTION("OID Registry");
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MODULE_AUTHOR("Red Hat, Inc.");
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MODULE_LICENSE("GPL");
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/**
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* look_up_OID - Find an OID registration for the specified data
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* @data: Binary representation of the OID
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* @datasize: Size of the binary representation
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*/
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enum OID look_up_OID(const void *data, size_t datasize)
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{
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const unsigned char *octets = data;
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enum OID oid;
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unsigned char xhash;
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unsigned i, j, k, hash;
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size_t len;
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/* Hash the OID data */
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hash = datasize - 1;
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for (i = 0; i < datasize; i++)
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hash += octets[i] * 33;
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hash = (hash >> 24) ^ (hash >> 16) ^ (hash >> 8) ^ hash;
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hash &= 0xff;
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/* Binary search the OID registry. OIDs are stored in ascending order
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* of hash value then ascending order of size and then in ascending
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* order of reverse value.
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*/
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i = 0;
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k = OID__NR;
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while (i < k) {
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j = (i + k) / 2;
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xhash = oid_search_table[j].hash;
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if (xhash > hash) {
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k = j;
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continue;
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}
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if (xhash < hash) {
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i = j + 1;
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continue;
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}
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oid = oid_search_table[j].oid;
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len = oid_index[oid + 1] - oid_index[oid];
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if (len > datasize) {
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k = j;
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continue;
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}
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if (len < datasize) {
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i = j + 1;
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continue;
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}
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/* Variation is most likely to be at the tail end of the
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* OID, so do the comparison in reverse.
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*/
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while (len > 0) {
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unsigned char a = oid_data[oid_index[oid] + --len];
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unsigned char b = octets[len];
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if (a > b) {
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k = j;
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goto next;
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}
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if (a < b) {
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i = j + 1;
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goto next;
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}
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}
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return oid;
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next:
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;
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}
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return OID__NR;
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}
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EXPORT_SYMBOL_GPL(look_up_OID);
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/**
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* parse_OID - Parse an OID from a bytestream
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* @data: Binary representation of the header + OID
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* @datasize: Size of the binary representation
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* @oid: Pointer to oid to return result
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*
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* Parse an OID from a bytestream that holds the OID in the format
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* ASN1_OID | length | oid. The length indicator must equal to datasize - 2.
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* -EBADMSG is returned if the bytestream is too short.
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*/
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int parse_OID(const void *data, size_t datasize, enum OID *oid)
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{
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const unsigned char *v = data;
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/* we need 2 bytes of header and at least 1 byte for oid */
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if (datasize < 3 || v[0] != ASN1_OID || v[1] != datasize - 2)
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return -EBADMSG;
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*oid = look_up_OID(data + 2, datasize - 2);
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return 0;
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}
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EXPORT_SYMBOL_GPL(parse_OID);
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/*
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* sprint_OID - Print an Object Identifier into a buffer
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* @data: The encoded OID to print
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* @datasize: The size of the encoded OID
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* @buffer: The buffer to render into
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* @bufsize: The size of the buffer
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*
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* The OID is rendered into the buffer in "a.b.c.d" format and the number of
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* bytes is returned. -EBADMSG is returned if the data could not be interpreted
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* and -ENOBUFS if the buffer was too small.
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*/
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int sprint_oid(const void *data, size_t datasize, char *buffer, size_t bufsize)
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{
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const unsigned char *v = data, *end = v + datasize;
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unsigned long num;
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unsigned char n;
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size_t ret;
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int count;
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if (v >= end)
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goto bad;
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n = *v++;
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ret = count = snprintf(buffer, bufsize, "%u.%u", n / 40, n % 40);
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if (count >= bufsize)
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return -ENOBUFS;
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buffer += count;
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bufsize -= count;
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while (v < end) {
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num = 0;
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n = *v++;
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if (!(n & 0x80)) {
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num = n;
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} else {
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num = n & 0x7f;
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do {
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if (v >= end)
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goto bad;
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n = *v++;
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num <<= 7;
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num |= n & 0x7f;
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} while (n & 0x80);
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}
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ret += count = snprintf(buffer, bufsize, ".%lu", num);
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if (count >= bufsize)
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return -ENOBUFS;
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buffer += count;
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bufsize -= count;
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}
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return ret;
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bad:
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snprintf(buffer, bufsize, "(bad)");
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return -EBADMSG;
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}
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EXPORT_SYMBOL_GPL(sprint_oid);
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/**
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* sprint_OID - Print an Object Identifier into a buffer
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* @oid: The OID to print
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* @buffer: The buffer to render into
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* @bufsize: The size of the buffer
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*
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* The OID is rendered into the buffer in "a.b.c.d" format and the number of
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* bytes is returned.
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*/
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int sprint_OID(enum OID oid, char *buffer, size_t bufsize)
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{
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int ret;
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BUG_ON(oid >= OID__NR);
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ret = sprint_oid(oid_data + oid_index[oid],
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oid_index[oid + 1] - oid_index[oid],
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buffer, bufsize);
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BUG_ON(ret == -EBADMSG);
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return ret;
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}
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EXPORT_SYMBOL_GPL(sprint_OID);
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