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mops_ext_lldp.c
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mops_ext_lldp.c
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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:https://www.gnu.org/licenses/gpl-2.0.html
*
*/
#include "mz.h"
#include "mops.h"
#include "cli.h"
// Initialization function - specify defaults here!
//
int mops_init_pdesc_lldp(struct mops *mp)
{
struct mops_ext_lldp * pd;
int i=0;
if (mp->p_desc == NULL) return 1; // p_desc not properly assigned
pd = mp->p_desc;
mp->eth_type = 0x88cc;
str2hex("01:80:c2:00:00:0e", mp->eth_dst, 6);
mp->ndelay.tv_sec = 30;
mp->ndelay.tv_nsec = 0;
// get interface index for that packet
i = mops_get_device_index(mp->device);
pd->non_conform = 0;
pd->chassis_id_subtype = 4; // MAC address
if (pd->chassis_id==NULL) pd->chassis_id = malloc(255);
if (pd->chassis_id==NULL) return 1;
memcpy((void*) pd->chassis_id, (void*) device_list[i].mac_mops, 6);
pd->chassis_id_len = 6;
pd->port_id_subtype = 5; // interface name
pd->port_id_len = strnlen(mp->device, 15);
if (pd->port_id==NULL) pd->port_id = malloc(255);
if (pd->port_id==NULL) return 1;
memcpy((void*) pd->port_id, (void*) mp->device, pd->port_id_len);
pd->TTL = 120;
pd->optional_tlvs_s = 0;
if (pd->optional_tlvs==NULL) pd->optional_tlvs = malloc(MAX_LLDP_OPT_TLVS);
if (pd->optional_tlvs == NULL) return 1;
return 0;
}
int mops_update_lldp (struct mops * mp)
{
struct mops_ext_lldp * 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!
switch (pd->non_conform) {
case 0: // Derive mandatory TLVs from struct entries and insert optional_tlvs
mp->msg_s += mops_lldp_tlv_chassis(mp->msg,
pd->chassis_id_subtype,
pd->chassis_id_len,
pd->chassis_id);
mp->msg_s += mops_lldp_tlv_port(&mp->msg[mp->msg_s],
pd->port_id_subtype,
pd->port_id_len,
pd->port_id);
mp->msg_s += mops_lldp_tlv_TTL(&mp->msg[mp->msg_s],
pd->TTL);
if (pd->optional_tlvs_s) {
memcpy((void*) &mp->msg[mp->msg_s],
(void*) pd->optional_tlvs,
pd->optional_tlvs_s);
mp->msg_s += pd->optional_tlvs_s;
}
mp->msg_s += mops_lldp_tlv_end(&mp->msg[mp->msg_s]);
break;
case 1: // User defined ALL TLVs (i. e. ignore struct entries)
if (pd->optional_tlvs_s) {
memcpy((void*) &mp->msg[mp->msg_s],
(void*) pd->optional_tlvs,
pd->optional_tlvs_s);
mp->msg_s += pd->optional_tlvs_s;
}
mp->msg_s += mops_lldp_tlv_end(&mp->msg[mp->msg_s]);
break;
default:
return 1;
}
return 0;
}
///////////////////////////////////////////////////////////////////////////////
// //
// Below are utility functions to creade the LLDPU. From these, the //
// following can be used for the optional part: //
// //
// //
// //
// //
/*
int mops_lldp_opt_tlv (struct mops *mp, int type, int len, u_int8_t *value)
int mops_lldp_opt_tlv_chassis (struct mops *mp, int subtype, int len, u_int8_t *cid)
int mops_lldp_opt_tlv_port (struct mops *mp, int subtype, int len, u_int8_t *pid)
int mops_lldp_opt_tlv_TTL (struct mops *mp, int ttl)
int mops_lldp_opt_tlv_vlan (struct mops *mp, int vlan)
int mops_lldp_opt_tlv_end (struct mops *mp)
int mops_lldp_opt_tlv_bad (struct mops *mp, int type, int badlen, int len, u_int8_t *value)
int mops_lldp_opt_tlv_org (struct mops *mp, int oui, int subtype, int len, u_int8_t *inf)
*/
// //
// //
// //
// //
// //
// //
// //
// //
///////////////////////////////////////////////////////////////////////////////
// Creates a LLDP TLV for a given type number and value string. The result will
// be written into 'tlv'.
//
// NOTE: len must be given and indicates the length of value.
//
// RETURN VALUE: - Total number of bytes of this tlv
// - 0 upon error
//
int mops_lldp_tlv (u_int8_t *tlv, int type, int len, u_int8_t *value)
{
u_int16_t tl=0, tln=0;
if ((type>127) || (len>511)) return 0;
tl = type << 9;
tl |= len;
tln = htons(tl);
memcpy((void*) tlv, (void*) &tln, 2);
memcpy((void*) &tlv[2], (void*) value, len);
return len+2;
}
// Same as above but **adds the TLVs to the 'pd->optional_tlvs' string.**
// It also checks if MAX_LLDP_OPT_TLVS is exceeded.
//
// NOTE: first argument is a pointer to that mops!
//
// RETURN VALUE: - 0 upon error (no more space)
// - Total number of bytes written
//
int mops_lldp_opt_tlv (struct mops * mp, int type, int len, u_int8_t *value)
{
struct mops_ext_lldp * pd;
u_int8_t tmp[MAX_LLDP_OPT_TLVS]; // this *must* be sufficient in length
int l;
if (mp->p_desc == NULL) return 1; // p_desc not properly assigned
pd = mp->p_desc;
l = mops_lldp_tlv (tmp, type, len, value);
if ((MAX_LLDP_OPT_TLVS - pd->optional_tlvs_s)< (l+1)) return -1; // not enough space
memcpy((void*) (pd->optional_tlvs + pd->optional_tlvs_s), (void*) tmp, l);
pd->optional_tlvs_s += l;
return l;
}
///////////////////////////////////////////////////////////////////////////////
// //
// //
// //
///////////////////////////////////////////////////////////////////////////////
// Creates a Chassis ID TLV -- the first mandatory TLV.
// The result will be written into 'tlv'.
//
// RETURN VALUE: - Total number of bytes within tlv
// - 0 upon error
//
int mops_lldp_tlv_chassis (u_int8_t *tlv, int subtype, int len, u_int8_t *cid)
{
u_int8_t tmp[256];
if ((len>255) || (subtype>255)) return 0;
tmp[0] = (u_int8_t) subtype;
memcpy((void*) (tmp+1), (void*) cid, len);
return mops_lldp_tlv(tlv, 1, len+1, tmp);
}
// Same but for optional tlv string
int mops_lldp_opt_tlv_chassis (struct mops *mp, int subtype, int len, u_int8_t *cid)
{
u_int8_t tmp[256];
if ((len>255) || (subtype>255)) return 0;
tmp[0] = (u_int8_t) subtype;
memcpy((void*) (tmp+1), (void*) cid, len);
return mops_lldp_opt_tlv(mp, 1, len+1, tmp);
}
///////////////////////////////////////////////////////////////////////////////
// //
// //
// //
///////////////////////////////////////////////////////////////////////////////
// Creates a Port ID TLV -- the second mandatory TLV.
// The result will be written into 'tlv'.
//
// RETURN VALUE: - Total number of bytes within tlv
// - 0 upon error
//
int mops_lldp_tlv_port (u_int8_t *tlv, int subtype, int len, u_int8_t *pid)
{
u_int8_t tmp[256];
if ((len>255) || (subtype>255)) return 0;
tmp[0] = (u_int8_t) subtype;
memcpy((void*) (tmp+1), (void*) pid, len);
return mops_lldp_tlv(tlv, 2, len+1, tmp);
}
// Same but for optional tlv string
int mops_lldp_opt_tlv_port (struct mops *mp, int subtype, int len, u_int8_t *pid)
{
u_int8_t tmp[256];
if ((len>255) || (subtype>255)) return 0;
tmp[0] = (u_int8_t) subtype;
memcpy((void*) (tmp+1), (void*) pid, len);
return mops_lldp_opt_tlv(mp, 2, len+1, tmp);
}
///////////////////////////////////////////////////////////////////////////////
// //
// //
// //
///////////////////////////////////////////////////////////////////////////////
// Creates a TTL TLV -- the third mandatory TLV.
// The result will be written into 'tlv'.
//
// RETURN VALUE: - Total number of bytes within tlv
// - 0 upon error
//
int mops_lldp_tlv_TTL (u_int8_t *tlv, int ttl)
{
u_int16_t ttlh=0, ttln=0;
if (ttl>0xffff) return 0;
ttlh = (u_int16_t) ttl;
ttln = htons(ttlh);
return mops_lldp_tlv(tlv, 3, 2, (u_int8_t*) &ttln);
}
// Same but for optional tlv string
int mops_lldp_opt_tlv_TTL (struct mops *mp, int ttl)
{
u_int16_t ttlh=0, ttln=0;
if (ttl>0xffff) return 0;
ttlh = (u_int16_t) ttl;
ttln = htons(ttlh);
return mops_lldp_opt_tlv(mp, 3, 2, (u_int8_t*) &ttln);
}
///////////////////////////////////////////////////////////////////////////////
// //
// //
// //
///////////////////////////////////////////////////////////////////////////////
// Creates an End of LLDPDU TLV -- the last mandatory TLV.
// The result will be written into 'tlv'.
//
// RETURN VALUE: - Total number of bytes within tlv
// - 0 upon error
//
int mops_lldp_tlv_end (u_int8_t *tlv)
{
tlv[0] = 0x00;
tlv[1] = 0x00;
return 2;
}
// Same but for optional tlv string
int mops_lldp_opt_tlv_end (struct mops *mp)
{
struct mops_ext_lldp * pd;
if (mp->p_desc == NULL) return 1; // p_desc not properly assigned
pd = mp->p_desc;
if ((MAX_LLDP_OPT_TLVS - pd->optional_tlvs_s) > 2) {
pd->optional_tlvs[pd->optional_tlvs_s++] = 0x00;
pd->optional_tlvs[pd->optional_tlvs_s++] = 0x00;
return 2;
} else
return 0;
}
///////////////////////////////////////////////////////////////////////////////
// //
// //
// //
///////////////////////////////////////////////////////////////////////////////
// Creates a 'bad' LLDP TLV for a given type number and value string.
// The result will be appended into 'pd->optional_tlvs'
//
// NOTE: 'len' must be given and indicates the TRUE length of value.
// 'badlen' can be any number and is used as official length within the TLV
//
// RETURN VALUE: - Total number of bytes within tlv
// - 0 upon error
//
int mops_lldp_opt_tlv_bad (struct mops *mp,
int type,
int badlen,
int len,
u_int8_t *value)
{
u_int16_t tl=0, tln=0;
u_int8_t tlv[512];
struct mops_ext_lldp * pd = mp->p_desc;
if ((type>127) || (len>511) || (badlen>511)) return 0;
if ((MAX_LLDP_OPT_TLVS - pd->optional_tlvs_s) < (len+3)) return 0;
tl = type << 9;
tl |= badlen;
tln = htons(tl);
memcpy((void*) tlv, (void*) &tln, 2);
memcpy((void*) &tlv[2], (void*) value, len);
// this detour has historical reasons ;-)
memcpy((void*) (pd->optional_tlvs + pd->optional_tlvs_s), (void*) tlv, len+2);
pd->optional_tlvs += len+2;
return len+2;
}
// Creates a Organisational-specific TLV -- the second mandatory TLV.
// The result will be appended into 'pd->optional_tlvs'
//
// RETURN VALUE: - Total number of bytes within tlv
// - 0 upon error
//
int mops_lldp_opt_tlv_org (struct mops *mp,
int oui,
int subtype,
int len,
u_int8_t *inf)
{
u_int8_t tmp[512];
u_int8_t *x;
u_int32_t oui_n = (u_int32_t) oui;
if ((len>507) || (subtype>255) || (oui_n>0xffffff)) return 0;
x = (u_int8_t *) &oui_n;
tmp[0] = *(x+2);
tmp[1] = *(x+1);
tmp[2] = *x;
tmp[3] = (u_int8_t) subtype;
memcpy((void*) (tmp+4), (void*) inf, len);
return mops_lldp_opt_tlv(mp, 127, len+4, tmp);
}
int mops_lldp_opt_tlv_vlan (struct mops *mp,
int vlan)
{
u_int16_t vid;
if (vlan>0xffff) return 0; // yes, we also allow VLAN IDs > 4095
vid = htons(vlan);
return mops_lldp_opt_tlv_org (mp, 0x80c2, 1, 2, (u_int8_t*) &vid);
}