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/*
* Mausezahn - A fast versatile traffic generator
* Copyright (C) 2008-2010 Herbert Haas
*
* This program is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License version 2 as published by the
* Free Software Foundation.
*
* 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/gpl-2.0.html
*
*/
#include "mz.h"
#include "mops.h"
// Initialization function - specify defaults here!
//
int mops_init_pdesc_bpdu(struct mops *mp)
{
struct mops_ext_bpdu * pd;
int i;
if (mp->p_desc == NULL) return 1; // p_desc not properly assigned
pd = mp->p_desc;
// 1. - Initialize Ethernet header
str2hex("01:80:C2:00:00:00",mp->eth_dst, 6);
// 2. - Initialize BPDU fields
pd->id = 0;
pd->version = 0; // 0=802.1D, 2=RSTP(802.1w)
pd->bpdu_type = 0x80; // 0=conf, 0x80=topology change, 2=RSTP/MSTP
pd->flags = 0; // X... .... = TCN ACK
// .X.. .... = Agreement
// ..X. .... = Forwarding
// ...X .... = Learning
// .... XX.. = Port Role (e. g. 11=Desgn)
// .... ..X. = Proposal
// .... ...X = TCN
i = mops_get_device_index(tx.device);
if (i!=-1) { // found
memcpy((void*) &pd->root_id[2], (void*) device_list[i].mac_mops, 6);
memcpy((void*) &pd->bridge_id[2], (void*) device_list[i].mac_mops, 6);
} else {
str2hex("00:00:00:00:00:00", &pd->root_id[2], 6);
str2hex("00:00:00:00:00:00", &pd->bridge_id[2], 6);
}
pd->root_id[0] = 0x00;
pd->root_id[1] = 0x00;
pd->bridge_id[0] = 0x00;
pd->bridge_id[1] = 0x00;
pd->root_pc = 0; // Root Path Cost
pd->port_id = 0; // Port Identifier
pd->message_age = 0; // All timers are multiples of 1/256 sec. Thus times range from 0 to 256 seconds.
pd->max_age = 5120; // 20 seconds
pd->hello_time = 512;
pd->f_delay = 3840;
str2hex("00:00:00:00:00:00:00:00", pd->trailer, 8);
// either all-zero or 00:00:00:00:02:VLAN(16bit) when PVST+
pd->rstp = 0; // 1 = RSTP
pd->pvst = 0; // 1=PVST+ , 0 = 802.1D
pd->mstp = 0; // 1 = Multiple Instance STP
return 0;
}
/////////////////////////////////////////////////////////////////////////////////
/////////////////////////////// Update functions ////////////////////////////////
//
// **** Here is a summary of mops tool functions: ****
//
// Adds single byte to msg
// int mops_msg_add_byte (struct mops *mp, u_int8_t data);
//
// Adds bit field in *previous* msg-byte using optional left-shift
// int mops_msg_add_field (struct mops *mp, u_int8_t data, int shift);
//
// Adds two bytes in network byte order to msg
// int mops_msg_add_2bytes (struct mops *mp, u_int16_t data);
//
// Adds four bytes in network byte order to msg
// int mops_msg_add_4bytes (struct mops *mp, u_int32_t data);
//
// Adds string of bytes with lenght len
// int mops_msg_add_string (struct mops *mp, u_int8_t *str, int len);
int mops_update_bpdu(struct mops * mp)
{
struct mops_ext_bpdu * pd;
pd = mp->p_desc;
if (pd==NULL) return 1; // no valid pointer to a p_desc
mp->msg_s = 0; // important! Otherwise the msg would get longer and longer after each call!
// NOTE: the length field does not include the trailer!
if (pd->pvst)
{
str2hex("01:00:0C:CC:CC:CD", mp->eth_dst, 6);
mp->eth_len=50;
str2hex("aa:aa:03:00:00:0c:01:0b",mp->eth_snap, 8);
mp->eth_snap_s = 8;
}
else
{
str2hex("01:80:C2:00:00:00",mp->eth_dst, 6);
mp->eth_len=38;
str2hex("42:42:03",mp->eth_snap, 3);
mp->eth_snap_s = 3;
}
mops_msg_add_2bytes (mp, pd->id);
mops_msg_add_byte (mp, pd->version);
mops_msg_add_byte (mp, pd->bpdu_type);
if (pd->bpdu_type & 0x80) // if TCN then don't add more fields
{
if (pd->pvst) mp->eth_len=12; else mp->eth_len=7;
}
else
{
mops_msg_add_byte (mp, pd->flags);
mops_msg_add_string (mp, pd->root_id, 8);
mops_msg_add_4bytes (mp, pd->root_pc);
mops_msg_add_string (mp, pd->bridge_id, 8);
mops_msg_add_2bytes (mp, pd->port_id);
mops_msg_add_2bytes (mp, pd->message_age);
mops_msg_add_2bytes (mp, pd->max_age);
mops_msg_add_2bytes (mp, pd->hello_time);
mops_msg_add_2bytes (mp, pd->f_delay);
}
// we always add the trailer
mops_msg_add_string (mp, pd->trailer, 8);
return 0;
}
// Create RID or BID based on priority, ext-sys-id, and MAC address.
// The last parameter selects BID (0) or RID (1)
//
// pri .... 0-15
// esi .... 0-4095
// mac .... XX:XX:XX:XX:XX:XX or interface name
//
// NOTE: Invalid parameters will result in default values
//
// RETURN VALUE: Only informational; identifies which parameter
// was errourness, using the following values:
//
// 0 ... all parameters valid
// 1 ... priority exceeded range
// 2 ... ext-sys-id exceeded range
// 3 ... invalid MAC address or invalid interface
// 4 ... other
int mops_create_bpdu_bid(struct mops * mp, int pri, int esi, char *mac, int bid_or_rid)
{
int i;
struct mops_ext_bpdu * pd = mp->p_desc;
u_int8_t rid[8];
u_int16_t p16;
if ((pri<0)||(pri>15)) return 1;
if ((esi<0)||(esi>4095)) return 2;
if (mac!=NULL) {
// first check if an interface is specified:
i = mops_get_device_index(mac);
if (i!=-1) { // found
memcpy((void*) &rid[2], (void*) device_list[i].mac_mops, 6);
}
else { // MAC address given?
if (mops_pdesc_mac(&rid[2], mac)) {
return 3;
}
}
} else { // mac==NULL
// use MAC of default interface!
i = mops_get_device_index(tx.device);
if (i!=-1) { // found
memcpy((void*) &rid[2], (void*) device_list[i].mac_mops, 6);
}
else {
str2hex("00:00:00:00:00:00", &rid[2], 6);
return 4;
}
}
// now prepend pri, esi
p16 = pri;
p16 <<= 12;
p16 |= esi;
mops_hton2 (&p16, &rid[0]);
if (bid_or_rid)
memcpy((void*) pd->root_id, (void*) rid, 8);
else
memcpy((void*) pd->bridge_id, (void*) rid, 8);
return 0;
}
int mops_create_bpdu_trailer (struct mops * mp, u_int16_t vlan)
{
struct mops_ext_bpdu * pd = mp->p_desc;
// PVST+ requires a trailer with either all-zero
// or 00:00:00:00:02:VLAN(16bit)
// trailer already initialized with zeroes
pd->trailer[0]=0x00;
pd->trailer[1]=0x00;
pd->trailer[2]=0x00;
pd->trailer[3]=0x00;
pd->trailer[4]=0x02;
pd->trailer[5]=0x00;
pd->trailer[6]=0x00;
mops_hton2 (&vlan, &pd->trailer[5]);
return 0;
}
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