![Jeremy Kerr](/assets/img/avatar_default.png)
This change adds a protocol dissector for the Management Component Transport Protocol (MCTP). This is a failry simple datagram-based protocol for messaging between components within a single platform, typically over I2C, serial or PCIe. This dissector just implements the header fields, and sequence-number based message reassembly. Inner protocols will be added as follow-up changes. Linux has support for AF_MCTP data, so decode from the MCTP SLL ltype. Signed-off-by: Jeremy Kerr <jk@codeconstruct.com.au>
389 lines
13 KiB
C
389 lines
13 KiB
C
/** @file
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* Definitions for structures storing addresses, and for the type of
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* variables holding port-type values
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#ifndef __ADDRESS_H__
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#define __ADDRESS_H__
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#include <string.h> /* for memcmp */
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#include "tvbuff.h"
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#include <epan/wmem_scopes.h>
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#include <wsutil/ws_assert.h>
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#ifdef __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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/* Types of "global" addresses Wireshark knows about. */
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/* Address types can be added here if there are many dissectors that use them or just
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* within a specific dissector.
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* If an address type is added here, it must be "registered" within address_types.c
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* For dissector address types, just use the address_type_dissector_register function
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* from address_types.h
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*
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* AT_NUMERIC - a numeric address type can consist of a guint8, guint16, guint32 or guint64
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* value. If no correct length is provided, to avoid data bleed, a guint8 is
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* assumed. Only representation (aka conversion of value to string) is implemented for this type.
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*/
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typedef enum {
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AT_NONE, /* no link-layer address */
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AT_ETHER, /* MAC (Ethernet, 802.x, FDDI) address */
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AT_IPv4, /* IPv4 */
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AT_IPv6, /* IPv6 */
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AT_IPX, /* IPX */
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AT_FC, /* Fibre Channel */
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AT_FCWWN, /* Fibre Channel WWN */
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AT_STRINGZ, /* null-terminated string */
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AT_EUI64, /* IEEE EUI-64 */
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AT_IB, /* Infiniband GID/LID */
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AT_AX25, /* AX.25 */
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AT_VINES, /* Banyan Vines address */
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AT_NUMERIC, /* Numeric address type. */
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AT_MCTP, /* MCTP */
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AT_END_OF_LIST /* Must be last in list */
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} address_type;
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typedef struct _address {
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int type; /* type of address */
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int len; /* length of address, in bytes */
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const void *data; /* pointer to address data */
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/* private */
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void *priv;
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} address;
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#define ADDRESS_INIT(type, len, data) {type, len, data, NULL}
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#define ADDRESS_INIT_NONE ADDRESS_INIT(AT_NONE, 0, NULL)
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static inline void
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clear_address(address *addr)
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{
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addr->type = AT_NONE;
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addr->len = 0;
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addr->data = NULL;
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addr->priv = NULL;
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}
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/** Initialize an address with the given values.
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*
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* @param addr [in,out] The address to initialize.
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* @param addr_type [in] Address type.
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* @param addr_len [in] The length in bytes of the address data. For example, 4 for
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* AT_IPv4 or sizeof(ws_in6_addr) for AT_IPv6.
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* @param addr_data [in] Pointer to the address data.
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*/
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static inline void
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set_address(address *addr, int addr_type, int addr_len, const void *addr_data) {
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if (addr_len == 0) {
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/* Zero length must mean no data */
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ws_assert(addr_data == NULL);
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} else {
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/* Must not be AT_NONE - AT_NONE must have no data */
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ws_assert(addr_type != AT_NONE);
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/* Make sure we *do* have data */
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ws_assert(addr_data != NULL);
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}
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addr->type = addr_type;
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addr->len = addr_len;
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addr->data = addr_data;
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addr->priv = NULL;
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}
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/** Initialize an address from TVB data.
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*
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* Same as set_address but it takes a TVB and an offset. This is preferred
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* over passing the return value of tvb_get_ptr() to set_address().
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*
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* This calls tvb_get_ptr() (including throwing any exceptions) before
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* modifying the address.
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*
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* @param addr [in,out] The address to initialize.
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* @param addr_type [in] Address type.
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* @param tvb [in] Pointer to the TVB.
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* @param offset [in] Offset within the TVB.
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* @param addr_len [in] The length in bytes of the address data. For example, 4 for
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* AT_IPv4 or sizeof(ws_in6_addr) for AT_IPv6.
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*/
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static inline void
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set_address_tvb(address *addr, int addr_type, int addr_len, tvbuff_t *tvb, int offset) {
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const void *p;
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if (addr_len != 0) {
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/* Must not be AT_NONE - AT_NONE must have no data */
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ws_assert(addr_type != AT_NONE);
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p = tvb_get_ptr(tvb, offset, addr_len);
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} else
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p = NULL;
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set_address(addr, addr_type, addr_len, p);
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}
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/** Initialize an address with the given values, allocating a new buffer
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* for the address data using wmem-scoped memory.
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*
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* @param scope [in] The lifetime of the allocated memory, e.g., pinfo->pool
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* @param addr [in,out] The address to initialize.
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* @param addr_type [in] Address type.
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* @param addr_len [in] The length in bytes of the address data. For example, 4 for
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* AT_IPv4 or sizeof(ws_in6_addr) for AT_IPv6.
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* @param addr_data [in] Pointer to the address data.
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*/
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static inline void
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alloc_address_wmem(wmem_allocator_t *scope, address *addr,
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int addr_type, int addr_len, const void *addr_data) {
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ws_assert(addr);
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clear_address(addr);
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addr->type = addr_type;
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if (addr_len == 0) {
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/* Zero length must mean no data */
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ws_assert(addr_data == NULL);
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/* Nothing to copy */
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return;
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}
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/* Must not be AT_NONE - AT_NONE must have no data */
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ws_assert(addr_type != AT_NONE);
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/* Make sure we *do* have data to copy */
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ws_assert(addr_data != NULL);
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addr->data = addr->priv = wmem_memdup(scope, addr_data, addr_len);
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addr->len = addr_len;
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}
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/** Allocate an address from TVB data.
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*
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* Same as alloc_address_wmem but it takes a TVB and an offset.
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*
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* @param scope [in] The lifetime of the allocated memory, e.g., pinfo->pool
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* @param addr [in,out] The address to initialize.
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* @param addr_type [in] Address type.
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* @param addr_len [in] The length in bytes of the address data. For example, 4 for
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* AT_IPv4 or sizeof(ws_in6_addr) for AT_IPv6.
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* @param tvb [in] Pointer to the TVB.
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* @param offset [in] Offset within the TVB.
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*/
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static inline void
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alloc_address_tvb(wmem_allocator_t *scope, address *addr,
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int addr_type, int addr_len, tvbuff_t *tvb, int offset) {
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const void *p;
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p = tvb_get_ptr(tvb, offset, addr_len);
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alloc_address_wmem(scope, addr, addr_type, addr_len, p);
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}
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/** Compare two addresses.
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*
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* @param addr1 [in] The first address to compare.
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* @param addr2 [in] The second address to compare.
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* @return 0 if the addresses are equal,
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* A positive number if addr1 > addr2 in some nondefined metric,
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* A negative number if addr1 < addr2 in some nondefined metric.
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*/
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static inline int
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cmp_address(const address *addr1, const address *addr2) {
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if (addr1->type > addr2->type) return 1;
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if (addr1->type < addr2->type) return -1;
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if (addr1->len > addr2->len) return 1;
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if (addr1->len < addr2->len) return -1;
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if (addr1->len == 0) {
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/*
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* memcmp(NULL, NULL, 0) is *not* guaranteed to work, so
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* if both addresses are zero-length, don't compare them
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* (there's nothing to compare, so they're equal).
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*/
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return 0;
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}
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return memcmp(addr1->data, addr2->data, addr1->len);
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}
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/** Check two addresses for equality.
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*
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* Given two addresses, return "true" if they're equal, "false" otherwise.
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* Addresses are equal only if they have the same type and length; if the
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* length is zero, they are then equal, otherwise the data must be the
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* same.
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*
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* @param addr1 [in] The first address to compare.
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* @param addr2 [in] The second address to compare.
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* @return TRUE if the addresses are equal, FALSE otherwise.
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*/
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static inline gboolean
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addresses_equal(const address *addr1, const address *addr2) {
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/*
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* memcmp(NULL, NULL, 0) is *not* guaranteed to work, so
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* if both addresses are zero-length, don't compare them
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* (there's nothing to compare, so they're equal).
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*/
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if (addr1->type == addr2->type &&
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addr1->len == addr2->len &&
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(addr1->len == 0 ||
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memcmp(addr1->data, addr2->data, addr1->len) == 0))
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return TRUE;
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return FALSE;
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}
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/** Check the data of two addresses for equality.
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*
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* Given two addresses, return "true" if they have the same length and,
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* their data is equal, "false" otherwise.
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* The address types are ignored. This can be used to compare custom
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* address types defined with address_type_dissector_register.
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*
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* @param addr1 [in] The first address to compare.
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* @param addr2 [in] The second address to compare.
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* @return TRUE if the addresses are equal, FALSE otherwise.
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*/
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static inline gboolean
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addresses_data_equal(const address *addr1, const address *addr2) {
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if ( addr1->len == addr2->len
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&& memcmp(addr1->data, addr2->data, addr1->len) == 0
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) return TRUE;
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return FALSE;
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}
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/** Perform a shallow copy of the address (both addresses point to the same
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* memory location).
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*
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* @param to [in,out] The destination address.
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* @param from [in] The source address.
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*
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* \warning Make sure 'from' memory stays valid for the lifetime of this object.
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* Also it's strongly recommended to use this function instead of copy-assign.
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*/
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static inline void
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copy_address_shallow(address *to, const address *from) {
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set_address(to, from->type, from->len, from->data);
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}
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/** Copy an address, allocating a new buffer for the address data
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* using wmem-scoped memory.
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*
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* @param scope [in] The lifetime of the allocated memory, e.g., pinfo->pool
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* @param to [in,out] The destination address.
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* @param from [in] The source address.
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*/
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static inline void
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copy_address_wmem(wmem_allocator_t *scope, address *to, const address *from) {
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alloc_address_wmem(scope, to, from->type, from->len, from->data);
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}
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/** Copy an address, allocating a new buffer for the address data.
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*
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* @param to [in,out] The destination address.
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* @param from [in] The source address.
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*/
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static inline void
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copy_address(address *to, const address *from) {
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copy_address_wmem(NULL, to, from);
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}
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/** Free an address allocated with wmem-scoped memory.
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*
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* @param scope [in] The lifetime of the allocated memory, e.g., pinfo->pool
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* @param addr [in,out] The address whose data to free.
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*/
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static inline void
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free_address_wmem(wmem_allocator_t *scope, address *addr) {
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/* Because many dissectors set 'type = AT_NONE' to mean clear we check for that */
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if (addr->type != AT_NONE && addr->len > 0 && addr->priv != NULL) {
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/* Make sure API use is correct */
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/* if priv is not null then data == priv */
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ws_assert(addr->data == addr->priv);
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wmem_free(scope, addr->priv);
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}
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clear_address(addr);
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}
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/** Free an address.
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*
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* @param addr [in,out] The address whose data to free.
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*/
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static inline void
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free_address(address *addr) {
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free_address_wmem(NULL, addr);
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}
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/** Hash an address into a hash value (which must already have been set).
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*
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* @param hash_val The existing hash value.
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* @param addr The address to add.
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* @return The new hash value.
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*/
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static inline guint
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add_address_to_hash(guint hash_val, const address *addr) {
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const guint8 *hash_data = (const guint8 *)(addr)->data;
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int idx;
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for (idx = 0; idx < (addr)->len; idx++) {
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hash_val += hash_data[idx];
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hash_val += ( hash_val << 10 );
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hash_val ^= ( hash_val >> 6 );
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}
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return hash_val;
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}
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/** Hash an address into a hash value (which must already have been set).
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* 64-bit version of add_address_to_hash().
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*
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* @param hash_val The existing hash value.
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* @param addr The address to add.
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* @return The new hash value.
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*/
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static inline guint64
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add_address_to_hash64(guint64 hash_val, const address *addr) {
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const guint8 *hash_data = (const guint8 *)(addr)->data;
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int idx;
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for (idx = 0; idx < (addr)->len; idx++) {
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hash_val += hash_data[idx];
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hash_val += ( hash_val << 10 );
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hash_val ^= ( hash_val >> 6 );
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}
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return hash_val;
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}
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WS_DLL_PUBLIC guint address_to_bytes(const address *addr, guint8 *buf, guint buf_len);
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/* Types of port numbers Wireshark knows about. */
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typedef enum {
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PT_NONE, /* no port number */
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PT_SCTP, /* SCTP */
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PT_TCP, /* TCP */
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PT_UDP, /* UDP */
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PT_DCCP, /* DCCP */
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PT_IPX, /* IPX sockets */
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PT_DDP, /* DDP AppleTalk connection */
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PT_IDP, /* XNS IDP sockets */
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PT_USB, /* USB endpoint 0xffff means the host */
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PT_I2C,
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PT_IBQP, /* Infiniband QP number */
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PT_BLUETOOTH,
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PT_IWARP_MPA, /* iWarp MPA */
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PT_MCTP
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} port_type;
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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#endif /* __ADDRESS_H__ */
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/*
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* Editor modelines - https://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 4
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* vi: set shiftwidth=4 tabstop=8 expandtab:
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* :indentSize=4:tabSize=8:noTabs=true:
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*/
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