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/********************************************************************************
NDPMon - Neighbor Discovery Protocol Monitor
Copyright (C) 2006 MADYNES Project, LORIA - INRIA Lorraine (France)
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
Author Info:
Name: Thibault Cholez
Mail: thibault.cholez@esial.uhp-nancy.fr
Maintainer:
Name: Frederic Beck
Mail: frederic.beck@loria.fr
MADYNES Project, LORIA-INRIA Lorraine, hereby disclaims all copyright interest in
the tool 'NDPMon' (Neighbor Discovery Protocol Monitor) written by Thibault Cholez.
Olivier Festor, Scientific Leader of the MADYNEs Project, 20 August 2006
***********************************************************************************/
#include "membounds.h"
#include "monitoring.h"
/*Look for mismatch between the source link layer addr and the one anounced
*in the icmp option*/
int watch_eth_mismatch(char* buffer, const u_char* packet, struct ether_header* eptr, struct ip6_hdr* ipptr, struct icmp6_hdr* icmpptr, int packet_len)
{
int jump=0;
uint8_t opt_type;
const u_char* pos;
struct nd_opt_hdr* optptr; /*netinet/icmp6.h*/
struct ether_addr* addr1, *addr2;
char str_ip[IP6_STR_SIZE];
switch (icmpptr->icmp6_type)
{
case ND_ROUTER_SOLICIT :
jump = sizeof(struct nd_router_solicit);
opt_type=1;
break;
case ND_ROUTER_ADVERT:
jump = sizeof(struct nd_router_advert);
opt_type=1;
break;
case ND_NEIGHBOR_SOLICIT:
jump = sizeof(struct nd_neighbor_solicit);
opt_type=1;
break;
case ND_NEIGHBOR_ADVERT:
jump = sizeof(struct nd_neighbor_advert);
opt_type=2;
break;
case ND_REDIRECT:
return 0;
break;
default:
return 0;
break;
}/*end switch*/
/*We have to search the link layer option among the others options*/
pos = packet + ETHERNET_SIZE + IPV6_SIZE + jump;
optptr = (struct nd_opt_hdr*) ( pos );
while((optptr->nd_opt_type != 0) &&((u_char*)optptr < (packet+packet_len)))
{
if(DEBUG)
print_opt(*optptr);
if(optptr->nd_opt_type == opt_type)
{
addr1 = (struct ether_addr*) eptr->ether_shost;
addr2 = (struct ether_addr*) (pos + sizeof(struct nd_opt_hdr));
ipv6_ntoa(str_ip, ipptr->ip6_src);
/*mac addr = 48bits: 6Bytes*8*/
if(MEMCMP(addr1,addr2,6)!=0)
{
char eth1[MAC_STR_SIZE];
strncpy( eth1, ether_ntoa(addr1), MAC_STR_SIZE);
snprintf (buffer, NOTIFY_BUFFER_SIZE, "ethernet mismatch %s %s %s", ether_ntoa(addr2),eth1, str_ip);
notify(1, buffer, "ethernet mismatch", addr1, str_ip, addr2);
return 1;
}
else
{
return 0;
}
}
else
{
/*Next option field*/
pos += (optptr->nd_opt_len)*8;
optptr = (struct nd_opt_hdr*) ( pos );
}
}
return 0;
}
/*Look if the source mac address is a broadcast addr or is all zeros*/
int watch_eth_broadcast(char* buffer, struct ether_header* eptr, struct ip6_hdr* ipptr)
{
struct ether_addr* eth_addr = (struct ether_addr*) eptr->ether_shost;
struct ether_addr* test = malloc(sizeof(struct ether_addr));
char str_ip[IP6_STR_SIZE];
int broad =0;
bzero(test,6);
if (MEMCMP(eth_addr, test,6) ==0)
broad=1;
else
{
memset(test,255,6);
if(MEMCMP(eth_addr, test,6)==0)
broad= 1;
else
{
char* test2= "33:33:0:0:0:1";
if(strcmp(ether_ntoa(eth_addr), test2)==0)
broad=1;
}
}
if(broad)
{
ipv6_ntoa(str_ip, ipptr->ip6_src);
snprintf (buffer, NOTIFY_BUFFER_SIZE, "ethernet broadcast %s %s",ether_ntoa(eth_addr), str_ip);
free(test);
notify(1, buffer, "ethernet broadcast", eth_addr, str_ip, NULL);
return 1;
} else {
free(test);
return 0;
}
}
/*Look if the source ip address is a broadcast addr*/
int watch_ip_broadcast(char* buffer, struct ether_header* eptr, struct ip6_hdr* ipptr)
{
struct ether_addr* eth_addr = (struct ether_addr*) eptr->ether_shost;
struct in6_addr* ip_addr = &ipptr->ip6_src;
char str_ip[IP6_STR_SIZE];
ipv6_ntoa(str_ip, *ip_addr);
if (IN6_IS_ADDR_MULTICAST(ip_addr))
{
snprintf (buffer, NOTIFY_BUFFER_SIZE, "ip multicast %s %s",ether_ntoa(eth_addr),str_ip);
notify(1, buffer, "ip multicast", eth_addr, str_ip, NULL);
return 1;
}
else
return 0;
}
/*Look if the source ip address is local to the subnet*/
int watch_bogon(char* buffer, struct ether_header* eptr, struct ip6_hdr* ipptr)
{
struct ether_addr* eth_addr = (struct ether_addr*) eptr->ether_shost;
struct in6_addr* ip_addr = &ipptr->ip6_src;
char str_ip[IP6_STR_SIZE];
router_list_t *tmp = routers;
int find = 0;
ipv6_ntoa(str_ip, *ip_addr);
while( tmp != NULL)
{
prefix_t *ptmp = tmp->prefixes;
while(ptmp != NULL)
{
if(IN6_ARE_PRE_EQUAL(ip_addr, &(ptmp->prefix)))
find = 1;
ptmp = ptmp->next;
}
tmp = tmp->next;
}
if (!find && !IN6_IS_ADDR_UNSPECIFIED(ip_addr)&&!IN6_IS_ADDR_LINKLOCAL(ip_addr)&&!IN6_IS_ADDR_MULTICAST(ip_addr)&&!IN6_IS_ADDR_SITELOCAL(ip_addr))
{
snprintf (buffer, NOTIFY_BUFFER_SIZE, "bogon %s %s",ether_ntoa(eth_addr),str_ip);
notify(1, buffer, "bogon", eth_addr, str_ip, NULL);
return 1;
}
else
return 0;
}
/* Look if the hop limit is set to 255 */
int watch_hop_limit(char* buffer, struct ether_header* eptr, struct ip6_hdr* ipptr)
{
struct ether_addr* eth_addr = (struct ether_addr*) eptr->ether_shost;
struct in6_addr* ip_addr = &ipptr->ip6_src;
char str_ip[IP6_STR_SIZE];
int hlim;
ipv6_ntoa(str_ip, *ip_addr);
hlim = ipptr->ip6_hlim;
if(hlim != 255)
{
snprintf (buffer, NOTIFY_BUFFER_SIZE, "IPv6 Hop Limit %d", hlim);
notify(1, buffer, "wrong ipv6 hop limit", eth_addr, str_ip, NULL);
return 1;
}
return 0;
}
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