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m241Neelima/components/ip_net2-6.9/iprohc/src/iprohc_util.c
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neelimap afc7070c1f original files of m241
2026-07-30 11:19:44 +05:30

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/* iprohc_util.c - ROHC utility routines */
/*
* Copyright (c) 2013 Wind River Systems, Inc.
*
* The right to copy, distribute or otherwise make use of this software
* may be licensed only pursuant to the terms of an applicable Wind River
* license agreement. No license to Wind River intellectual property rights
* is granted herein. All rights not licensed by Wind River are reserved
* by Wind River.
*/
/*
modification history
--------------------
01r,06aug13,j_y Clean low impact code review defects
01q,21nov12,ggz Defect WIND00387435. Validate comp/decomp ptrs before usage
01p,20oct11,ggz Support multiple profiles per channel. WIND00312948
01o,20oct11,ggz Fix for defect WIND00312450
01n,08dec10,ggz Add 64 bit support
01m,08apr10,ggz Resolve a compiler warning
01l,27mar10,ggz Resolve coverity warnings
01k,18mar10,ggz Remove comments in comp. profile selection function
01j,22feb10,ggz Add ESP/IP,UDP/IP profiles
01i,10jan10,ggz Add functions to determine transport layer protocol
and UDP packet length.
01h,05jan10,ggz Modifications to support ESP_IP UDP_IP profiles
01g,20nov09,ggz Add iprohc_d_choose_profile function
01f,05feb09,tlu Remove interface number restriction in shell cmds
01e,11aug08,tlu Add to print source address in feedback print function
01d,15jun18,ggz Add uncompressed pkt type to iprohc_pkt_type() function
01c,15may08,tlu Add debug utilities
01b,25apr08,tlu Add CRC caculation functions
01a,25feb08,tlu Created.
*/
/*
****************************************************************************
* DESCRIPTION
****************************************************************************
*/
/*
****************************************************************************
* CONFIGURATION
****************************************************************************
*/
#include "iprohc_config.h"
/*
****************************************************************************
* INCLUDE FILES
****************************************************************************
*/
#define IPCOM_USE_CLIB_PROTO
/* ipcom */
#include <ipcom_type.h>
#include <ipcom_cstyle.h>
#include <ipcom_clib.h>
#include <ipcom_os.h>
#include <ipcom_sysvar.h>
#include <ipcom_err.h>
#include <ipcom_syslog.h>
#include <ipcom_list.h>
#include <ipcom_time.h>
#include <ipcom_inet.h>
/* iprohc */
#include "iprohc.h"
#include "iprohc_ip.h"
/*
****************************************************************************
* DEFINES
****************************************************************************
*/
IP_EXTERN Iprohc_data iprohc;
/* This is a compile flag, turning on it will build debug message into image */
#undef ROHC_DEBUG
#undef IPROHC_UDP_SEND_UNCOMPRESSED
/*
****************************************************************************
* LOCAL TYPES
****************************************************************************
*/
/*
****************************************************************************
* LOCAL Data
****************************************************************************
*/
IP_STATIC Ip_u8 crc3_tab[] = {
0x00, 0x06, 0x01, 0x07, 0x02, 0x04, 0x03, 0x05, 0x04, 0x02,
0x05, 0x03, 0x06, 0x00, 0x07, 0x01, 0x05, 0x03, 0x04, 0x02,
0x07, 0x01, 0x06, 0x00, 0x01, 0x07, 0x00, 0x06, 0x03, 0x05,
0x02, 0x04, 0x07, 0x01, 0x06, 0x00, 0x05, 0x03, 0x04, 0x02,
0x03, 0x05, 0x02, 0x04, 0x01, 0x07, 0x00, 0x06, 0x02, 0x04,
0x03, 0x05, 0x00, 0x06, 0x01, 0x07, 0x06, 0x00, 0x07, 0x01,
0x04, 0x02, 0x05, 0x03, 0x03, 0x05, 0x02, 0x04, 0x01, 0x07,
0x00, 0x06, 0x07, 0x01, 0x06, 0x00, 0x05, 0x03, 0x04, 0x02,
0x06, 0x00, 0x07, 0x01, 0x04, 0x02, 0x05, 0x03, 0x02, 0x04,
0x03, 0x05, 0x00, 0x06, 0x01, 0x07, 0x04, 0x02, 0x05, 0x03,
0x06, 0x00, 0x07, 0x01, 0x00, 0x06, 0x01, 0x07, 0x02, 0x04,
0x03, 0x05, 0x01, 0x07, 0x00, 0x06, 0x03, 0x05, 0x02, 0x04,
0x05, 0x03, 0x04, 0x02, 0x07, 0x01, 0x06, 0x00, 0x06, 0x00,
0x07, 0x01, 0x04, 0x02, 0x05, 0x03, 0x02, 0x04, 0x03, 0x05,
0x00, 0x06, 0x01, 0x07, 0x03, 0x05, 0x02, 0x04, 0x01, 0x07,
0x00, 0x06, 0x07, 0x01, 0x06, 0x00, 0x05, 0x03, 0x04, 0x02,
0x01, 0x07, 0x00, 0x06, 0x03, 0x05, 0x02, 0x04, 0x05, 0x03,
0x04, 0x02, 0x07, 0x01, 0x06, 0x00, 0x04, 0x02, 0x05, 0x03,
0x06, 0x00, 0x07, 0x01, 0x00, 0x06, 0x01, 0x07, 0x02, 0x04,
0x03, 0x05, 0x05, 0x03, 0x04, 0x02, 0x07, 0x01, 0x06, 0x00,
0x01, 0x07, 0x00, 0x06, 0x03, 0x05, 0x02, 0x04, 0x00, 0x06,
0x01, 0x07, 0x02, 0x04, 0x03, 0x05, 0x04, 0x02, 0x05, 0x03,
0x06, 0x00, 0x07, 0x01, 0x02, 0x04, 0x03, 0x05, 0x00, 0x06,
0x01, 0x07, 0x06, 0x00, 0x07, 0x01, 0x04, 0x02, 0x05, 0x03,
0x07, 0x01, 0x06, 0x00, 0x05, 0x03, 0x04, 0x02, 0x03, 0x05,
0x02, 0x04, 0x01, 0x07, 0x00, 0x06
};
IP_STATIC Ip_u8 crc7_tab[] = {
0x00, 0x09, 0x12, 0x1b, 0x24, 0x2d, 0x36, 0x3f, 0x48, 0x41,
0x5a, 0x53, 0x6c, 0x65, 0x7e, 0x77, 0x19, 0x10, 0x0b, 0x02,
0x3d, 0x34, 0x2f, 0x26, 0x51, 0x58, 0x43, 0x4a, 0x75, 0x7c,
0x67, 0x6e, 0x32, 0x3b, 0x20, 0x29, 0x16, 0x1f, 0x04, 0x0d,
0x7a, 0x73, 0x68, 0x61, 0x5e, 0x57, 0x4c, 0x45, 0x2b, 0x22,
0x39, 0x30, 0x0f, 0x06, 0x1d, 0x14, 0x63, 0x6a, 0x71, 0x78,
0x47, 0x4e, 0x55, 0x5c, 0x64, 0x6d, 0x76, 0x7f, 0x40, 0x49,
0x52, 0x5b, 0x2c, 0x25, 0x3e, 0x37, 0x08, 0x01, 0x1a, 0x13,
0x7d, 0x74, 0x6f, 0x66, 0x59, 0x50, 0x4b, 0x42, 0x35, 0x3c,
0x27, 0x2e, 0x11, 0x18, 0x03, 0x0a, 0x56, 0x5f, 0x44, 0x4d,
0x72, 0x7b, 0x60, 0x69, 0x1e, 0x17, 0x0c, 0x05, 0x3a, 0x33,
0x28, 0x21, 0x4f, 0x46, 0x5d, 0x54, 0x6b, 0x62, 0x79, 0x70,
0x07, 0x0e, 0x15, 0x1c, 0x23, 0x2a, 0x31, 0x38, 0x41, 0x48,
0x53, 0x5a, 0x65, 0x6c, 0x77, 0x7e, 0x09, 0x00, 0x1b, 0x12,
0x2d, 0x24, 0x3f, 0x36, 0x58, 0x51, 0x4a, 0x43, 0x7c, 0x75,
0x6e, 0x67, 0x10, 0x19, 0x02, 0x0b, 0x34, 0x3d, 0x26, 0x2f,
0x73, 0x7a, 0x61, 0x68, 0x57, 0x5e, 0x45, 0x4c, 0x3b, 0x32,
0x29, 0x20, 0x1f, 0x16, 0x0d, 0x04, 0x6a, 0x63, 0x78, 0x71,
0x4e, 0x47, 0x5c, 0x55, 0x22, 0x2b, 0x30, 0x39, 0x06, 0x0f,
0x14, 0x1d, 0x25, 0x2c, 0x37, 0x3e, 0x01, 0x08, 0x13, 0x1a,
0x6d, 0x64, 0x7f, 0x76, 0x49, 0x40, 0x5b, 0x52, 0x3c, 0x35,
0x2e, 0x27, 0x18, 0x11, 0x0a, 0x03, 0x74, 0x7d, 0x66, 0x6f,
0x50, 0x59, 0x42, 0x4b, 0x17, 0x1e, 0x05, 0x0c, 0x33, 0x3a,
0x21, 0x28, 0x5f, 0x56, 0x4d, 0x44, 0x7b, 0x72, 0x69, 0x60,
0x0e, 0x07, 0x1c, 0x15, 0x2a, 0x23, 0x38, 0x31, 0x46, 0x4f,
0x54, 0x5d, 0x62, 0x6b, 0x70, 0x79
};
IP_STATIC Ip_u8 crc8_tab[] = {
0x00, 0x07, 0x0e, 0x09, 0x1c, 0x1b, 0x12, 0x15, 0x38, 0x3f,
0x36, 0x31, 0x24, 0x23, 0x2a, 0x2d, 0x70, 0x77, 0x7e, 0x79,
0x6c, 0x6b, 0x62, 0x65, 0x48, 0x4f, 0x46, 0x41, 0x54, 0x53,
0x5a, 0x5d, 0xe0, 0xe7, 0xee, 0xe9, 0xfc, 0xfb, 0xf2, 0xf5,
0xd8, 0xdf, 0xd6, 0xd1, 0xc4, 0xc3, 0xca, 0xcd, 0x90, 0x97,
0x9e, 0x99, 0x8c, 0x8b, 0x82, 0x85, 0xa8, 0xaf, 0xa6, 0xa1,
0xb4, 0xb3, 0xba, 0xbd, 0xc7, 0xc0, 0xc9, 0xce, 0xdb, 0xdc,
0xd5, 0xd2, 0xff, 0xf8, 0xf1, 0xf6, 0xe3, 0xe4, 0xed, 0xea,
0xb7, 0xb0, 0xb9, 0xbe, 0xab, 0xac, 0xa5, 0xa2, 0x8f, 0x88,
0x81, 0x86, 0x93, 0x94, 0x9d, 0x9a, 0x27, 0x20, 0x29, 0x2e,
0x3b, 0x3c, 0x35, 0x32, 0x1f, 0x18, 0x11, 0x16, 0x03, 0x04,
0x0d, 0x0a, 0x57, 0x50, 0x59, 0x5e, 0x4b, 0x4c, 0x45, 0x42,
0x6f, 0x68, 0x61, 0x66, 0x73, 0x74, 0x7d, 0x7a, 0x89, 0x8e,
0x87, 0x80, 0x95, 0x92, 0x9b, 0x9c, 0xb1, 0xb6, 0xbf, 0xb8,
0xad, 0xaa, 0xa3, 0xa4, 0xf9, 0xfe, 0xf7, 0xf0, 0xe5, 0xe2,
0xeb, 0xec, 0xc1, 0xc6, 0xcf, 0xc8, 0xdd, 0xda, 0xd3, 0xd4,
0x69, 0x6e, 0x67, 0x60, 0x75, 0x72, 0x7b, 0x7c, 0x51, 0x56,
0x5f, 0x58, 0x4d, 0x4a, 0x43, 0x44, 0x19, 0x1e, 0x17, 0x10,
0x05, 0x02, 0x0b, 0x0c, 0x21, 0x26, 0x2f, 0x28, 0x3d, 0x3a,
0x33, 0x34, 0x4e, 0x49, 0x40, 0x47, 0x52, 0x55, 0x5c, 0x5b,
0x76, 0x71, 0x78, 0x7f, 0x6a, 0x6d, 0x64, 0x63, 0x3e, 0x39,
0x30, 0x37, 0x22, 0x25, 0x2c, 0x2b, 0x06, 0x01, 0x08, 0x0f,
0x1a, 0x1d, 0x14, 0x13, 0xae, 0xa9, 0xa0, 0xa7, 0xb2, 0xb5,
0xbc, 0xbb, 0x96, 0x91, 0x98, 0x9f, 0x8a, 0x8d, 0x84, 0x83,
0xde, 0xd9, 0xd0, 0xd7, 0xc2, 0xc5, 0xcc, 0xcb, 0xe6, 0xe1,
0xe8, 0xef, 0xfa, 0xfd, 0xf4, 0xf3
};
/*
****************************************************************************
* LOCAL PROTOTYPES
****************************************************************************
*/
/* Profile specific utility functions */
#ifdef IPROHC_UDP_SEND_UNCOMPRESSED
IP_STATIC int iprohc_udp_get_payload_length(Ipcom_pkt *pkt);
#endif
IP_STATIC Ip_err iprohc_c_get_protocol(Ipcom_pkt *pkt, Ip_u8* proto, int* hdr_ptr);
/*
****************************************************************************
* LOCAL FUNCTIONS
****************************************************************************
*/
/*
****************************************************************************
* PUBLIC FUNCTIONS
****************************************************************************
*/
/*
*===========================================================================
* iprohc_find_interface
*===========================================================================
* Description: Find a ROHC monitoring interface
* Parameters:
* Returns:
*
*/
IP_PUBLIC Iprohc_interface *
iprohc_find_interface(char *ifname)
{
Iprohc_interface *interface, *ninterface;
if (iprohc.opened == IP_FALSE)
{
IPCOM_LOG0(INFO, "iprohc_find_interface, ROHC not opened yet\n");
return IP_NULL;
}
IPROHC_LOCK();
for (interface = IPCOM_LIST_FIRST(&iprohc.if_head);
interface != IP_NULL;
interface = ninterface)
{
char if_name[IPROHC_IF_NAME_MAX];
IPROHC_IF_LOCK(interface);
ninterface = IPCOM_LIST_NEXT(&interface->interface_list);
if (interface->have_unitNum)
ipcom_sprintf(if_name, "%s%d", interface->name, interface->unitNum);
else
ipcom_sprintf(if_name, "%s", interface->name);
IPROHC_IF_UNLOCK(interface);
/* Find a peer entry with same address. */
if (ipcom_strcmp(if_name, ifname) == 0)
{
IPROHC_UNLOCK();
return interface;
}
}
IPROHC_UNLOCK();
IPCOM_LOG0(DEBUG, "iprohc_find_interface: failed to find the interface");
return IP_NULL;
}
/*
*===========================================================================
* iprohc_add_interface
*===========================================================================
* Description: Add a ROHC monitoring interface
* Parameters:
* Returns:
*
*/
IP_PUBLIC Ip_err
iprohc_add_interface(char *name, Ip_bool have_num, Ip_u8 num)
{
Iprohc_interface *interface;
char ifname[IPROHC_IF_NAME_MAX];
if (iprohc.opened == IP_FALSE)
{
IPCOM_LOG0(INFO, "iprohc_add_interface, ROHC not opened yet\n");
return IPCOM_ERR_NOT_OPENED;
}
if (have_num)
ipcom_sprintf(ifname, "%s%d", name, num);
else
ipcom_sprintf(ifname, "%s", name);
interface = iprohc_find_interface(ifname);
if (interface != IP_NULL)
{
IPCOM_LOG0(INFO, "iprohc_add_interface, interface exists already\n");
return IPCOM_SUCCESS;
}
interface = (Iprohc_interface *)ipcom_malloc(sizeof(Iprohc_interface));
if (interface == IP_NULL)
{
IPCOM_LOG1(ERR, "iprohc_add_interface: out of memory (%ld bytes)",
sizeof(Iprohc_interface));
return IPCOM_ERR_NO_MEMORY;
}
/* preinit the memory pointed by interface */
ipcom_memset(interface, 0, sizeof(Iprohc_interface));
ipcom_strncpy(interface->name, name,IPROHC_IF_NAME_MAX);
interface->name[IPROHC_IF_NAME_MAX-1] = '\0';
interface->have_unitNum = have_num;
interface->unitNum = num;
/* Add the interface to the ROHC global data structure */
IPROHC_LOCK();
ipcom_list_insert_last(&iprohc.if_head, &interface->interface_list);
iprohc.if_num++;
IPROHC_UNLOCK();
/* create semaphore */
#ifdef IPROHC_ENABLE_REENTRANT
(void)ipcom_mutex_create(&interface->code_mutex);
#endif
return IPCOM_SUCCESS;
}
/*
*===========================================================================
* iprohc_del_interface
*===========================================================================
* Description: Remove a ROHC monitoring interface
* Parameters:
* Returns:
*
*/
IP_PUBLIC Ip_err
iprohc_del_interface(char *name, Ip_bool have_num, Ip_u8 num)
{
Iprohc_interface *interface;
char ifname[IPROHC_IF_NAME_MAX];
int i;
if (iprohc.opened == IP_FALSE)
{
IPCOM_LOG0(INFO, "iprohc_del_interface, ROHC not opened yet\n");
return IPCOM_ERR_NOT_OPENED;
}
if (have_num)
ipcom_sprintf(ifname, "%s%d", name, num);
else
ipcom_sprintf(ifname, "%s", name);
interface = iprohc_find_interface(ifname);
if (interface == IP_NULL)
{
IPCOM_LOG0(INFO, "iprohc_del_interface, interface not in monitoring list\n");
return IPCOM_SUCCESS;
}
/* Remove the interface from the ROHC global data structure and list */
IPROHC_LOCK();
ip_assert(iprohc.if_num > 0);
iprohc.if_num--;
IPROHC_UNLOCK();
IPROHC_IF_LOCK(interface);
ipcom_list_remove(&interface->interface_list);
/* delete all profiles configured for the interface */
for (i = 0; i < IPROHC_MAX_PROFILE_IDS; i++)
if (interface->profiles[i])
(void)iprohc_if_del_profile(interface,(Ip_u8)i);
/* delete the compressor associated with the interface */
iprohc_del_compressor(interface->compressor);
/* delete the decompressor associated with the interface */
iprohc_del_decompressor(interface->decompressor);
IPROHC_IF_UNLOCK(interface);
#ifdef IPROHC_ENABLE_REENTRANT
(void)ipcom_mutex_delete(&interface->code_mutex);
#endif
/* free the memory pointed by interface */
ipcom_free(interface);
return IPCOM_SUCCESS;
}
/*
*===========================================================================
* iprohc_remove_interfaces
*===========================================================================
* Description: Remove all ROHC monitoring interfaces
* Parameters:
* Returns:
*
*/
IP_PUBLIC Ip_err
iprohc_remove_interfaces()
{
Iprohc_interface *interface, *ninterface;
int i;
if (iprohc.opened == IP_FALSE)
{
IPCOM_LOG0(INFO, "iprohc_remove_interfaces, ROHC not opened yet\n");
return IPCOM_ERR_NOT_OPENED;
}
IPROHC_LOCK();
for (interface = IPCOM_LIST_FIRST(&iprohc.if_head);
interface != IP_NULL;
interface = ninterface)
{
ninterface = IPCOM_LIST_NEXT(&interface->interface_list);
/* Remove the interface from the ROHC global data structure and list */
ip_assert(iprohc.if_num > 0);
iprohc.if_num--;
ipcom_list_remove(&interface->interface_list);
/* delete all profiles configured for the interface */
for (i = 0; i < IPROHC_MAX_PROFILE_IDS; i++)
if (interface->profiles[i])
(void)iprohc_if_del_profile(interface, (Ip_u8)i);
/* delete the compressor associated with the interface */
iprohc_del_compressor(interface->compressor);
/* delete the decompressor associated with the interface */
iprohc_del_decompressor(interface->decompressor);
#ifdef IPROHC_ENABLE_REENTRANT
(void)ipcom_mutex_delete(&interface->code_mutex);
#endif
/* free the memory pointed by interface */
ipcom_free(interface);
}
IPROHC_UNLOCK();
return IPCOM_SUCCESS;
}
/*
*===========================================================================
* iprohc_profile
*===========================================================================
* Description: print out a ROHC profile.
* Parameters:
* Returns:
*
*/
IP_PUBLIC char *
iprohc_profile(Ip_u8 profile_id)
{
switch(profile_id)
{
case ROHC_PROFILE_UNCOMPRESSED:
ipcom_strcpy(iprohc.buf, "uncompressed profile");
break;
case ROHC_PROFILE_RTP_UDP_IP:
ipcom_strcpy(iprohc.buf, "RTP/UDP/IP profile");
break;
case ROHC_PROFILE_UDP_IP:
ipcom_strcpy(iprohc.buf, "UDP/IP profile");
break;
case ROHC_PROFILE_ESP_IP:
ipcom_strcpy(iprohc.buf, "ESP/IP profile");
break;
case ROHC_PROFILE_IP:
ipcom_strcpy(iprohc.buf, "IP profile");
break;
case ROHC_PROFILE_LLA_IP_UDP_RTP:
ipcom_strcpy(iprohc.buf, "LLA IP/UDP/RTP profile");
break;
case ROHC_PROFILE_TCP_IP:
ipcom_strcpy(iprohc.buf, "TCP/IP profile");
break;
default:
ipcom_strcpy(iprohc.buf, "Unknown profile");
break;
}
return iprohc.buf;
}
/*
*===========================================================================
* iprohc_find_profile
*===========================================================================
* Description: Find whether a particular ROHC profile is configured.
* Parameters:
* Returns:
*
*/
IP_PUBLIC Ip_err
iprohc_find_profile(Ip_u8 profileid)
{
Ip_err retval = IPCOM_SUCCESS;
#ifdef ROHC_DEBUG
ipcom_printf("Calling iprohc_find_profile, profileid %d\n", profileid);
#endif
/* Validate the profile ID */
if (!IPROHC_VALID_PROFILE_ID(profileid))
{
IPCOM_LOG0(ERR, "iprohc_find_profile, not a valid profile ID\n");
return IPCOM_ERR_INVALID_ARG;
}
IPROHC_LOCK();
if (iprohc.profiles[profileid].configured)
{
IPCOM_LOG1(INFO, "iprohc_find_profile, profile %d is configured\n",
profileid);
}
else
retval = IPCOM_ERR_NOT_FOUND;
IPROHC_UNLOCK();
#ifdef ROHC_DEBUG
ipcom_printf("iprohc_find_profile, profile %d\n is not configured\n",
profileid);
#endif
return retval;
}
/*
*===========================================================================
* iprohc_del_profile
*===========================================================================
* Description: Remove a ROHC profile
* Parameters:
* Returns:
*
*/
IP_PUBLIC Ip_err
iprohc_del_profile(Ip_u8 profileid)
{
/* Validate the profile ID */
if (!IPROHC_VALID_PROFILE_ID(profileid))
{
IPCOM_LOG0(ERR, "iprohc_del_profile, not a valid profile ID\n");
return IPCOM_ERR_INVALID_ARG;
}
/* De-register the profile */
if (iprohc.profiles[profileid].p_deregister != IP_NULL)
iprohc.profiles[profileid].p_deregister();
return IPCOM_SUCCESS;
}
/*
*===========================================================================
* iprohc_choose_profile
*===========================================================================
* Description: Decide on a ROHC profile to compress a packet with.
* Parameters:
* Returns:
*
*/
IP_PUBLIC Ip_s8
iprohc_choose_profile(Iprohc_interface *interface, Ipcom_pkt *pkt)
{
Ip_s8 profileid = -1;
Ip_u8 proto;
int hdr_ptr;
#ifdef ROHC_DEBUG
if (interface->have_unitNum)
{
ipcom_printf("Calling iprohc_choose_profile, interface %s%d\n",
interface->name, interface->unitNum);
}
else
{
ipcom_printf("Calling iprohc_choose_profile, interface %s\n",
interface->name);
}
#endif
IPROHC_IF_LOCK(interface);
if (iprohc_c_get_protocol(pkt, &proto, &hdr_ptr) == IPCOM_ERR_FAILED) goto leave;
if ((proto == 6) && interface->profiles[ROHC_PROFILE_TCP_IP])
{
profileid = ROHC_PROFILE_TCP_IP;
/* Use pkt->tlstart to save the pointer to ESP header for ESP profile.
This is safe */
pkt->tlstart = hdr_ptr;
}
else if ((proto == 17) && (interface->profiles[ROHC_PROFILE_UDP_IP]))
{
/* pkt->tlstart is not always set for the transport layer protocol
by networking stack. Reset it. */
pkt->tlstart = hdr_ptr;
/* In RTP/UDP packet less than 12 octets should be compressed with uncompressed profile */
#ifdef IPROHC_UDP_SEND_UNCOMPRESSED
if (iprohc_udp_get_payload_length(pkt) <= 12) goto leave;
else
#endif
profileid = ROHC_PROFILE_UDP_IP;
}
else if ((proto == 50) && (interface->profiles[ROHC_PROFILE_ESP_IP]))
{
profileid = ROHC_PROFILE_ESP_IP;
/* Use pkt->tlstart to save the pointer to ESP header for ESP profile.
This is safe */
pkt->tlstart = hdr_ptr;
}
else if (interface->profiles[ROHC_PROFILE_IP])
{
profileid = ROHC_PROFILE_IP;
}
else if (interface->profiles[ROHC_PROFILE_UNCOMPRESSED])
{
profileid = ROHC_PROFILE_UNCOMPRESSED;
}
leave:
IPROHC_IF_UNLOCK(interface);
return profileid;
}
/*
*===========================================================================
* iprohc_choose_profile
*===========================================================================
* Description: Decide on a ROHC profile to compress a packet with.
* Parameters:
* Returns:
*
*/
IP_PUBLIC Ip_s8
iprohc_d_choose_profile(Iprohc_interface *interface, Ipcom_pkt *pkt)
{
Ip_s8 profileid = -1;
int pointer = pkt->ipstart;
Ip_u16 cid;
Ip_u8 type_data;
Iprohc_d_context *context, *ncontext;
#ifdef ROHC_DEBUG
if (interface->have_unitNum)
{
ipcom_printf("Calling iprohc_d_choose_profile, interface %s%d\n",
interface->name, interface->unitNum);
}
else
{
ipcom_printf("Calling iprohc_d_choose_profile, interface %s\n",
interface->name);
}
#endif
IPROHC_IF_LOCK(interface);
if (interface->decompressor == IP_NULL) goto l1;
/* Get packet type, CID and profile ID */
IPROHC_GET_CID(pkt, pointer, cid, type_data)
if (((type_data >> ROHC_PKT_IR_SHIFT) == ROHC_PKT_IR) || ( type_data == ROHC_PKT_IR_DYN))
{
profileid = (Ip_s8)pkt->data[pointer];
if (interface->profiles[profileid] == IP_FALSE) profileid = -1;
goto l1;
}
/* Lookup CID match in decompressor */
for (context = IPCOM_LIST_FIRST(&(interface->decompressor->context_head));
context != IP_NULL;
context = ncontext)
{
ncontext = IPCOM_LIST_NEXT(&context->context_list);
if (cid == context->cid)
{
profileid = (Ip_s8)context->profileid;
if (interface->profiles[profileid] == IP_FALSE)
{
IPCOM_LOG0(ERR, "iprohc_d_choose_profile, mismatch of context and interface profiles ID\n"); ;
profileid = -1;
}
goto l1;
}
}
l1:
IPROHC_IF_UNLOCK(interface);
#ifdef ROHC_DEBUG
ipcom_printf("Calling iprohc_d_choose_profile, interface %d\n", profileid);
#endif
return profileid;
}
/*
*===========================================================================
* iprohc_if_find_profile
*===========================================================================
* Description: Find whether a profile is configured on an interface
* Parameters:
* Returns:
*
*/
IP_PUBLIC Ip_err
iprohc_if_find_profile(Iprohc_interface *interface, Ip_u8 profileid)
{
Ip_err retval = IPCOM_SUCCESS;
#ifdef ROHC_DEBUG
if (interface->have_unitNum)
{
ipcom_printf("Enter iprohc_if_find_profile, interface %s%d, profileid %d\n",
interface->name, interface->unitNum, profileid);
}
else
{
ipcom_printf("Enter iprohc_if_find_profile, interface %s, profileid %d\n",
interface->name, profileid);
}
#endif
/* Validate the profile ID */
if (!IPROHC_VALID_PROFILE_ID(profileid))
{
IPCOM_LOG0(ERR, "iprohc_if_find_profile, not a valid profile ID\n");
return IPCOM_ERR_INVALID_ARG;
}
IPROHC_IF_LOCK(interface);
if (interface->profiles[profileid])
{
if (interface->have_unitNum)
{
IPCOM_LOG3(INFO, "iprohc_if_find_profile, profile %d is configured on interface %s%d\n",
profileid, interface->name, interface->unitNum);
}
else
{
IPCOM_LOG2(INFO, "iprohc_if_find_profile, profile %d is configured on interface %s\n",
profileid, interface->name);
}
IPROHC_IF_UNLOCK(interface);
return retval;
}
IPROHC_IF_UNLOCK(interface);
#ifdef ROHC_DEBUG
ipcom_printf("iprohc_if_find_profile, profile %d\n is not configured\n",
profileid);
#endif
return IPCOM_ERR_NOT_FOUND;
}
/*
*===========================================================================
* iprohc_if_add_profile
*===========================================================================
* Description: Add a ROHC profile to an interface
* Parameters:
* Returns:
*
*/
IP_PUBLIC Ip_err
iprohc_if_add_profile(Iprohc_interface *interface, Ip_u8 profileid)
{
#ifdef ROHC_DEBUG
if (interface->have_unitNum)
{
ipcom_printf("Enter iprohc_if_add_profile, interface %s%d, profileid %d\n",
interface->name, interface->unitNum, profileid);
}
else
{
ipcom_printf("Enter iprohc_if_add_profile, interface %s, profileid %d\n",
interface->name, profileid);
}
#endif
/* Check whether the profile is configured */
if (iprohc_find_profile(profileid) != IPCOM_SUCCESS)
{
IPCOM_LOG1(ERR, "iprohc_if_add_profile, not a configured profile %d\n",
profileid);
return IPCOM_ERR_INVALID_ARG;
}
IPROHC_IF_LOCK(interface);
if (interface->profiles[profileid])
{
IPCOM_LOG0(ERR, "iprohc_if_add_profile, profile already added\n");
IPROHC_IF_UNLOCK(interface);
return IPCOM_SUCCESS;
}
interface->profile_num++;
interface->profiles[profileid] = IP_TRUE;
/* Initialize feedback lists for the profile */
ipcom_list_init(&interface->feedback_head[profileid]);
/* Allocate a compressor structure for the profile */
if (interface->compressor == IP_NULL)
interface->compressor = iprohc_alloc_compressor((struct Iprohc_interface *)interface);
/* Allocate a decompressor structure for the profile */
if (interface->decompressor == IP_NULL)
interface->decompressor = iprohc_alloc_decompressor((struct Iprohc_interface *)interface);
IPROHC_IF_UNLOCK(interface);
#ifdef ROHC_DEBUG
ipcom_printf("iprohc_if_add_profile, added profile %d\n", profileid);
#endif
return IPCOM_SUCCESS;
}
/*
*===========================================================================
* iprohc_if_del_profile
*===========================================================================
* Description: Remove a ROHC profile from an interface
* Parameters:
* Returns:
*
*/
IP_PUBLIC Ip_err
iprohc_if_del_profile(Iprohc_interface *interface, Ip_u8 profileid)
{
Iprohc_feedback *feedback, *nfeedback;
#ifdef ROHC_DEBUG
if (interface->have_unitNum)
{
ipcom_printf("Enter iprohc_if_del_profile, interface %s%d, profileid %d\n",
interface->name, interface->unitNum, profileid);
}
else
{
ipcom_printf("Enter iprohc_if_del_profile, interface %s, profileid %d\n",
interface->name, profileid);
}
#endif
/* Check whether the profile is configured */
if (iprohc_find_profile(profileid) != IPCOM_SUCCESS)
{
IPCOM_LOG1(ERR, "iprohc_if_del_profile, not a configured profile %d\n",
profileid);
return IPCOM_ERR_INVALID_ARG;
}
IPROHC_IF_LOCK(interface);
if (!(interface->profiles[profileid]))
{
IPCOM_LOG0(ERR, "iprohc_if_del_profile, profile not configured\n");
IPROHC_IF_UNLOCK(interface);
return IPCOM_SUCCESS;
}
interface->profile_num--;
interface->profiles[profileid] = IP_FALSE;
/* free all feedbacks associated with the profile */
for (feedback = IPCOM_LIST_FIRST(&interface->feedback_head[profileid]);
feedback != IP_NULL;
feedback = nfeedback)
{
nfeedback = IPCOM_LIST_NEXT(&feedback->feedback_list);
interface->feedback_num[profileid]--;
ipcom_list_remove(&feedback->feedback_list);
ipcom_free(feedback);
}
iprohc_c_del_profile_contexts(interface->compressor, profileid);
iprohc_d_del_profile_contexts(interface->decompressor, profileid);
IPROHC_IF_UNLOCK(interface);
#ifdef ROHC_DEBUG
ipcom_printf("iprohc_if_del_profile, removed profile %d\n", profileid);
#endif
return IPCOM_SUCCESS;
}
/*
*===========================================================================
* iprohc_update_rnd_nbo
*===========================================================================
* Description: Update RND and NBO flags from old and new ip_id
* Parameters:
* Returns:
*
*/
IP_PUBLIC void
iprohc_update_rnd_nbo(Ip_u16 old_ipid, Ip_u16 ipid,
Ip_bool *rnd, Ip_bool *nbo, Ip_bool *sid)
{
Ip_u16 tmp_old_ipid, tmp_ipid;
#ifdef ROHC_DEBUG
ipcom_printf("Enter iprohc_update_rnd_nbo, old_ipid %x, %d, ipid %x, %d\n",
old_ipid, old_ipid, ipid, ipid);
#endif
tmp_old_ipid = ip_ntohs(old_ipid);
tmp_ipid = ip_ntohs(ipid);
/* Check for static IP ID */
if (old_ipid == ipid)
*sid = IP_TRUE;
else
*sid = IP_FALSE;
/* Check whether the to-be-transmitted IP-ID increments by 1 */
if ((tmp_ipid - tmp_old_ipid == 1) ||
((tmp_old_ipid == 0xFFFF) && (tmp_ipid == 0)))
{
*nbo = IP_TRUE;
*rnd = IP_FALSE;
return;
}
/* Swap byte order of old_ipid and ipid */
tmp_old_ipid = (Ip_u16)(((old_ipid>>8) & 0x00FF) | ((old_ipid<<8) & 0xFF00));
tmp_ipid = (Ip_u16)(((ipid>>8) & 0x00FF) | ((ipid<<8) & 0xFF00));
tmp_old_ipid = ip_ntohs(tmp_old_ipid);
tmp_ipid = ip_ntohs(tmp_ipid);
/* Check whether after swapping bytes, IP-ID increments by 1 */
if (tmp_ipid - tmp_old_ipid == 1)
{
*nbo = IP_FALSE;
*rnd = IP_FALSE;
return;
}
/* IP-ID is a pseudo-random number. */
/* Don't worry about NBO in this case, keep the value as was. */
*rnd = IP_TRUE;
}
/*
*===========================================================================
* iprohc_crc3
*===========================================================================
* Description: Calculate the 3-bit CRC value from a byte array
* The CRC polynomial to be used for the 3-bit CRC is:
* c(x) = 1 + x + x^3
*
* Parameters:
* Returns: 3-bit CRC value
*
*/
IP_PUBLIC Ip_u8 iprohc_crc3(Ip_u8 *data, int len)
{
Ip_u8 crc3val = 0x7;
Ip_u8 i;
for (i = 0; i < len; i++)
crc3val = crc3_tab[data[i]^(crc3val & 0x07)];
return crc3val;
}
/*
*===========================================================================
* iprohc_crc7
*===========================================================================
* Description: Calculate the 7-bit CRC value from a byte array
* The CRC polynomial to be used for the 7-bit CRC is:
* c(x) = 1 + x + x^2 + x^3 + x^6 + x^7
*
* Parameters:
* Returns: 7-bit CRC value
*
*/
IP_PUBLIC Ip_u8 iprohc_crc7(Ip_u8 *data, int len)
{
Ip_u8 crc7val = 0;
Ip_u8 i;
for (i = 0; i < len; i++)
crc7val = crc7_tab[(crc7val << 1) ^ data[i]];
return crc7val;
}
/*
*===========================================================================
* iprohc_crc8
*===========================================================================
* Description: Calculate the 8-bit CRC value from a byte array
* The CRC polynomial to be used for the 8-bit CRC is:
* c(x) = 1 + x + x^2 + x^8
*
* Parameters:
* Returns: 8-bit CRC value
*
*/
IP_PUBLIC Ip_u8 iprohc_crc8(Ip_u8 *data, int len)
{
Ip_u8 crc8val = 0;
Ip_u8 i;
for (i = 0; i < len; i++)
crc8val = crc8_tab[(crc8val ^ data[i]) & 0xff];
return crc8val;
}
/*
*===========================================================================
* iprohc_print_pkt
*===========================================================================
* Description: Debugging utility to print a packet
* Parameters:
* Returns:
*
*/
IP_PUBLIC void iprohc_print_pkt(Ipcom_pkt *pkt)
{
int i;
ipcom_printf("A packet: %x, start %d, ipstart %d, end %d, length %d\n",
pkt, pkt->start, pkt->ipstart, pkt->end, pkt->end - pkt->ipstart);
for (i = pkt->ipstart; i < pkt->end; i++)
ipcom_printf("%x ", pkt->data[i]);
ipcom_printf("\n");
}
/*
*===========================================================================
* iprohc_print_feedback
*===========================================================================
* Description: Debugging utility to print a feedback structure
* Parameters:
* Returns:
*
*/
IP_PUBLIC void iprohc_print_feedback(Iprohc_feedback *feedback)
{
int i;
char buf[48], srcbuf[48];
ipcom_printf("A feedback: %x\n", feedback);
ipcom_printf(" packet type: %s\n",
(feedback->packet_type==ROHC_PKT_IPV4)?"IPv4":"IPv6");
#ifdef IPCOM_USE_INET
if (feedback->packet_type == ROHC_PKT_IPV4)
{
/* An IPv4 packet */
(void)ipcom_inet_ntop(IP_AF_INET, &feedback->dst.addr4.addr32, buf,
sizeof(buf));
(void)ipcom_inet_ntop(IP_AF_INET, &feedback->src.addr4.addr32, srcbuf,
sizeof(srcbuf));
}
#ifdef IPCOM_USE_INET6
else
#endif
#endif /* #ifdef IPCOM_USE_INET */
#ifdef IPCOM_USE_INET6
{
(void)ipcom_inet_ntop(IP_AF_INET6, &feedback->dst.addr6, buf,
sizeof(buf));
(void)ipcom_inet_ntop(IP_AF_INET6, &feedback->src.addr6, srcbuf,
sizeof(srcbuf));
}
#endif /* #ifdef IPCOM_USE_INET6 */
ipcom_printf(" src address: %s\n", srcbuf);
ipcom_printf(" dst address: %s\n", buf);
ipcom_printf(" size: %d\n", feedback->size);
ipcom_printf(" data: ");
for (i = 0; i < feedback->size; i++)
ipcom_printf("%x ", feedback->data[i]);
ipcom_printf("\n");
}
/*
*===========================================================================
* iprohc_pkt_type
*===========================================================================
* Description: Debugging utility to print a packet
* Parameters:
* Returns:
*
*/
IP_PUBLIC char * iprohc_pkt_type(Ip_u8 pkt_type)
{
switch (pkt_type)
{
case ROHC_PKT_NORMAL:
ipcom_strcpy(iprohc.buf, "Normal IP v4/v6 Packet");
break;
case ROHC_PKT_COMPRESSED:
ipcom_strcpy(iprohc.buf, "Compressed Packet");
break;
case ROHC_PKT_COMP_UNCOMPRESSED:
ipcom_strcpy(iprohc.buf, "Uncompressed Packet");
break;
case ROHC_PKT_FEEDBACK:
ipcom_strcpy(iprohc.buf, "Feedback Packet");
break;
case ROHC_PKT_IR_DYN:
ipcom_strcpy(iprohc.buf, "IR-DYN Packet");
break;
case ROHC_PKT_IR:
ipcom_strcpy(iprohc.buf, "IR Packet");
break;
case ROHC_PKT_SEGMENT:
ipcom_strcpy(iprohc.buf, "Segment Packet");
break;
case ROHC_PKT_TYPE_0:
ipcom_strcpy(iprohc.buf, "Compressed Type 0 Packet");
break;
case ROHC_PKT_TYPE_1:
ipcom_strcpy(iprohc.buf, "Compressed Type 1 Packet");
break;
case ROHC_PKT_TYPE_2:
ipcom_strcpy(iprohc.buf, "Compressed Type 2 Packet");
break;
case ROHC_TCP_PKT_IR:
ipcom_strcpy(iprohc.buf, "IR(TCP) Packet");
break;
case ROHC_TCP_PKT_CO:
ipcom_strcpy(iprohc.buf, "ROHC_TCP_PKT_CO Packet");
break;
case ROHC_TCP_PKT_RND_1:
ipcom_strcpy(iprohc.buf, "ROHC_TCP_PKT_RND_1 Packet");
break;
/* case ROHC_TCP_PKT_RND_3:
ipcom_strcpy(iprohc.buf, "ROHC_TCP_PKT_RND_3 Packet");
break; */
case ROHC_TCP_PKT_RND_5:
ipcom_strcpy(iprohc.buf, "ROHC_TCP_PKT_RND_5 Packet");
break;
case ROHC_TCP_PKT_RND_7:
ipcom_strcpy(iprohc.buf, "ROHC_TCP_PKT_RND_7 Packet");
break;
case ROHC_TCP_PKT_SEQ_1:
ipcom_strcpy(iprohc.buf, "ROHC_TCP_PKT_SEQ_1 Packet");
break;
case ROHC_TCP_PKT_SEQ_3:
ipcom_strcpy(iprohc.buf, "ROHC_TCP_PKT_SEQ_3 Packet");
break;
case ROHC_TCP_PKT_SEQ_5:
ipcom_strcpy(iprohc.buf, "ROHC_TCP_PKT_SEQ_5 Packet");
break;
case ROHC_TCP_PKT_SEQ_7:
ipcom_strcpy(iprohc.buf, "ROHC_TCP_PKT_SEQ_7 Packet");
break;
default:
ipcom_strcpy(iprohc.buf, "Illegal Packet");
break;
}
return iprohc.buf;
}
/*
*===========================================================================
* iprohc_context_mode
*===========================================================================
* Description: Debugging utility to print a context mode
* Parameters:
* Returns:
*
*/
IP_PUBLIC char * iprohc_context_mode(Iprohc_mode mode)
{
switch (mode)
{
case ROHC_MODE_C:
ipcom_strcpy(iprohc.buf, "C-mode");
break;
case ROHC_MODE_U:
ipcom_strcpy(iprohc.buf, "U-mode");
break;
case ROHC_MODE_O:
ipcom_strcpy(iprohc.buf, "O-mode");
break;
case ROHC_MODE_R:
ipcom_strcpy(iprohc.buf, "R-mode");
break;
default:
ipcom_strcpy(iprohc.buf, "Illegal");
break;
}
return iprohc.buf;
}
/*
*===========================================================================
* iprohc_ext_type
*===========================================================================
* Description: Debugging utility to print a packet extension type
* Parameters:
* Returns:
*
*/
IP_PUBLIC char * iprohc_ext_type(Iprohc_extension extension)
{
switch (extension)
{
case ROHC_EXT_NO_EXT:
ipcom_strcpy(iprohc.buf, "No extension");
break;
case ROHC_EXT_0:
ipcom_strcpy(iprohc.buf, "Extension 0");
break;
case ROHC_EXT_1:
ipcom_strcpy(iprohc.buf, "Extension 1");
break;
case ROHC_EXT_2:
ipcom_strcpy(iprohc.buf, "Extension 2");
break;
case ROHC_EXT_3:
ipcom_strcpy(iprohc.buf, "Extension 3");
break;
default:
ipcom_strcpy(iprohc.buf, "Illegal");
break;
}
return iprohc.buf;
}
#ifndef IP_PORT_VXWORKS /* for Linux recursive semaphore */
/*
*===========================================================================
* iprohc_if_lck
*===========================================================================
* Description: This function provides a recursive semaphore lock to an ROHC
* monitoring interface.
* Parameters:
* Returns:
*
*/
IP_PUBLIC void
iprohc_if_lck(Iprohc_interface *interface)
{
Ip_pid_t cpid = ipcom_getpid();
#ifdef ROHC_DEBUG
ipcom_printf("Calling iprohc_if_lck: pid %d, counter %d, cpid %d\n",
interface->pid, interface->s_counter, cpid);
#endif
if (interface->pid == 0)
{
/* No one has semaphore, take it */
interface->pid = cpid;
interface->s_counter = 1;
ipcom_mutex_lock(interface->code_mutex);
}
else if (interface->pid != cpid)
/* block a different process/task */
ipcom_mutex_lock(interface->code_mutex);
else
/* the semaphore is taken by the same process, increase the counter */
interface->s_counter ++;
#ifdef ROHC_DEBUG
ipcom_printf("iprohc_if_lck: pid %d, counter %d, cpid %d\n",
interface->pid, interface->s_counter, cpid);
#endif
}
/*
*===========================================================================
* iprohc_if_unlck
*===========================================================================
* Description: This function provides a recursive semaphore unlock to an
* ROHC monitoring interface.
* Parameters:
* Returns:
*
*/
IP_PUBLIC void
iprohc_if_unlck(Iprohc_interface *interface)
{
Ip_pid_t cpid = ipcom_getpid();
#ifdef ROHC_DEBUG
ipcom_printf("Calling iprohc_if_unlck: pid %d, counter %d, cpid %d\n",
interface->pid, interface->s_counter, cpid);
#endif
if (interface->pid != cpid)
{
IPCOM_LOG0(ERR, "iprohc_if_unlck: released by a different process ");
return;
}
/* decrease the counter */
interface->s_counter --;
if (interface->s_counter == 0)
{
/* clear the semaphore PID */
interface->pid = 0;
/* release the semaphore */
ipcom_mutex_unlock(interface->code_mutex);
}
#ifdef ROHC_DEBUG
ipcom_printf("iprohc_if_unlck: pid %d, counter %d, cpid %d\n",
interface->pid, interface->s_counter, cpid);
#endif
}
#endif /* !IP_PORT_VXWORKS */
#ifdef IPROHC_UDP_SEND_UNCOMPRESSED
/*
*===========================================================================
* iprohc_udp_get_payload_length
*===========================================================================
* Description: Get UDP packet length
* Parameters:
* Returns:
*
*/
IP_STATIC int iprohc_udp_get_payload_length(Ipcom_pkt *pkt)
{
Ip_u16 data, length = 0;
ipcom_memcpy((Ip_u8 *) &data, (Ip_u8 *) &pkt->data[pkt->tlstart + 4], 2);
length = ipcom_ntohs(data);
#ifdef ROHC_DEBUG
ipcom_printf("iprohc_udp_get_payload_length: pkt->tlstart %d, udp pkt length %d\n",
pkt->tlstart, length);
#endif
return (int)length;
}
#endif
/*
*===========================================================================
* iprohc_c_get_protocol
*===========================================================================
* Description: Get the transport layer protocol
* Parameters:
* Returns:
*
*/
IP_STATIC Ip_err iprohc_c_get_protocol(Ipcom_pkt *pkt, Ip_u8* proto, int* hdr_ptr)
{
Ip_err retval = IPCOM_SUCCESS;
int pointer = pkt->ipstart;
Ip_u8 length = 0;
*hdr_ptr = -1;
while (pointer != -1)
{
#ifdef IPCOM_USE_INET
if ((pkt->data[pointer] >> 4) == 4)
{
/* An IPv4 packet */
Ipcom_ip_header *ip4 = (Ipcom_ip_header *)&pkt->data[pointer];
/* Check the protocl field */
if ((ip4->protocol == IP_IPPROTO_IPIP) ||
(ip4->protocol == IP_IPPROTO_IPV6))
{
/* Next header is IPinIP or IPv6, move pointer */
pointer += 4 * (pkt->data[pointer] & 0x0F);
*proto = ip4->protocol;
}
else if (IPROHC_PROC_EXT(ip4->protocol))
{
/* Move pointer to point to the extension header */
pointer += 4*(pkt->data[pointer]&0x0F);
*proto = ip4->protocol;
do {
if (IPROHC_IP6_EXT(*proto))
/*
* IPv6 ext header, Hdr-ext-len (second octet of the ext header)
* is the length of the extension header in 8-octet units, not
* including the first 8 octets.
*/
length = (Ip_u8)(8 * (pkt->data[pointer+1] + 1));
else
{
/* minimal encapsulation header */
if (pkt->data[pointer+1] & 0x80)
length = 12;
else
length = 8;
}
/* Get type of the next header and move the pointer to next ext header */
*proto = pkt->data[pointer];
pointer += length;
}while (IPROHC_PROC_EXT(*proto));
*hdr_ptr = pointer;
pointer = -1;
}
else
{
/* The end of IP header, exit from while loop */
*hdr_ptr = pointer + 4*(pkt->data[pointer]&0x0F);
*proto = ip4->protocol;
pointer = -1;
}
}
#ifdef IPCOM_USE_INET6
else
#endif
#endif /* #ifdef IPCOM_USE_INET */
#ifdef IPCOM_USE_INET6
if ((pkt->data[pointer] >> 4) == 6)
{
/* An IPv6 packet */
Ipcom_ip6_header *ip6 = (Ipcom_ip6_header *)&pkt->data[pointer];
/* Check the protocl field */
if (ip6->nxt == IP_IPPROTO_IPV6)
{
/* Next header is IPv6, move pointer */
pointer += IPROHC_IP6_HDR_SIZE;
*proto = ip6->nxt;
}
else if IPROHC_PROC_EXT(ip6->nxt)
{
/* Move pointer to point to the extension header */
pointer += IPROHC_IP6_HDR_SIZE;
/* Creat reference list for IP extension headers */
*proto = ip6->nxt;
do {
if (IPROHC_IP6_EXT(*proto))
/*
* IPv6 ext header, Hdr-ext-len (second octet of the ext header)
* is the length of the extension header in 8-octet units, not
* including the first 8 octets.
*/
length = (Ip_u8)(8 * (pkt->data[pointer+1] + 1));
else
{
/* minimal encapsulation header */
if (pkt->data[pointer+1] & 0x80)
length = 12;
else
length = 8;
}
/* Get type of the next header and move the pointer to next ext header */
*proto = pkt->data[pointer];
pointer += length;
}while (IPROHC_PROC_EXT(*proto));
*hdr_ptr = pointer;
pointer = -1;
}
else
{
*hdr_ptr = pointer + IPROHC_IP6_HDR_SIZE;
*proto = ip6->nxt;
/* The end of IP header, exit from while loop */
pointer = -1;
}
}
#endif /* #ifdef IPCOM_USE_INET6 */
}
#ifdef ROHC_DEBUG
ipcom_printf("iprohc_c_get_protocol: protocol %d, hdr_ptr %d, pkt->tlstart %d, pointer %d\n",
*proto, *hdr_ptr, pkt->tlstart, pointer);
#endif
if (*hdr_ptr == -1) retval = IPCOM_ERR_FAILED;
return retval;
}
/*
****************************************************************************
* END OF FILE
****************************************************************************
*/
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