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net.c
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/*
mtr -- a network diagnostic tool
Copyright (C) 1997,1998 Matt Kimball
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, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "config.h"
#if defined(HAVE_SYS_XTI_H)
#include <sys/xti.h>
#endif
#include <sys/types.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <sys/select.h>
#include <netinet/in.h>
#include <memory.h>
#include <unistd.h>
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <errno.h>
#include <string.h>
#include "mtr.h"
#include "net.h"
#include "display.h"
#include "dns.h"
/* We can't rely on header files to provide this information, because
the fields have different names between, for instance, Linux and
Solaris */
struct ICMPHeader {
uint8 type;
uint8 code;
uint16 checksum;
uint16 id;
uint16 sequence;
};
/* Structure of an UDP header. */
struct UDPHeader {
uint16 srcport;
uint16 dstport;
uint16 length;
uint16 checksum;
};
/* Structure of an TCP header, as far as we need it. */
struct TCPHeader {
uint16 srcport;
uint16 dstport;
uint32 seq;
};
/* Structure of an SCTP header */
struct SCTPHeader {
uint16 srcport;
uint16 dstport;
uint32 veri_tag;
};
/* Structure of an IPv4 UDP pseudoheader. */
struct UDPv4PHeader {
uint32 saddr;
uint32 daddr;
uint8 zero;
uint8 protocol;
uint16 len;
};
/* Structure of an IP header. */
struct IPHeader {
uint8 version;
uint8 tos;
uint16 len;
uint16 id;
uint16 frag;
uint8 ttl;
uint8 protocol;
uint16 check;
uint32 saddr;
uint32 daddr;
};
#define ICMP_ECHO 8
#define ICMP_ECHOREPLY 0
#define ICMP_TSTAMP 13
#define ICMP_TSTAMPREPLY 14
#define ICMP_TIME_EXCEEDED 11
#define ICMP_UNREACHABLE 3
#ifndef SOL_IP
#define SOL_IP 0
#endif
struct nethost {
ip_t addr;
ip_t addrs[MAXPATH]; /* for multi paths byMin */
int xmit;
int returned;
int sent;
int up;
long long var;/* variance, could be overflowed */
int last;
int best;
int worst;
int avg; /* average: addByMin */
int gmean; /* geometirc mean: addByMin */
int jitter; /* current jitter, defined as t1-t0 addByMin */
/*int jbest;*/ /* min jitter, of cause it is 0, not needed */
int javg; /* avg jitter */
int jworst; /* max jitter */
int jinta; /* estimated variance,? rfc1889's "Interarrival Jitter" */
int transit;
int saved[SAVED_PINGS];
int saved_seq_offset;
struct mplslen mpls;
struct mplslen mplss[MAXPATH];
};
struct sequence {
int index;
int transit;
int saved_seq;
struct timeval time;
int socket;
};
/* Configuration parameter: How many queries to unknown hosts do we
send? (This limits the amount of traffic generated if a host is not
reachable) */
#define MAX_UNKNOWN_HOSTS 5
/* BSD-derived kernels use host byte order for the IP length and
offset fields when using raw sockets. We detect this automatically at
run-time and do the right thing. */
static int BSDfix = 0;
static struct nethost host[MaxHost];
static struct sequence sequence[MaxSequence];
static struct timeval reset = { 0, 0 };
int timestamp;
int sendsock4;
int sendsock4_icmp;
int sendsock4_udp;
int recvsock4;
int sendsock6;
int sendsock6_icmp;
int sendsock6_udp;
int recvsock6;
int sendsock;
int recvsock;
#ifdef ENABLE_IPV6
struct sockaddr_storage sourcesockaddr_struct;
struct sockaddr_storage remotesockaddr_struct;
struct sockaddr_in6 * ssa6 = (struct sockaddr_in6 *) &sourcesockaddr_struct;
struct sockaddr_in6 * rsa6 = (struct sockaddr_in6 *) &remotesockaddr_struct;
#else
struct sockaddr_in sourcesockaddr_struct;
struct sockaddr_in remotesockaddr_struct;
#endif
struct sockaddr * sourcesockaddr = (struct sockaddr *) &sourcesockaddr_struct;
struct sockaddr * remotesockaddr = (struct sockaddr *) &remotesockaddr_struct;
struct sockaddr_in * ssa4 = (struct sockaddr_in *) &sourcesockaddr_struct;
struct sockaddr_in * rsa4 = (struct sockaddr_in *) &remotesockaddr_struct;
ip_t * sourceaddress;
ip_t * remoteaddress;
/* XXX How do I code this to be IPV6 compatible??? */
#ifdef ENABLE_IPV6
char localaddr[INET6_ADDRSTRLEN];
#else
#ifndef INET_ADDRSTRLEN
#define INET_ADDRSTRLEN 16
#endif
char localaddr[INET_ADDRSTRLEN];
#endif
static int batch_at = 0;
static int numhosts = 10;
extern int fstTTL; /* initial hub(ttl) to ping byMin */
extern int maxTTL; /* last hub to ping byMin*/
extern int cpacketsize; /* packet size used by ping */
static int packetsize; /* packet size used by ping */
extern int bitpattern; /* packet bit pattern used by ping */
extern int tos; /* type of service set in ping packet*/
extern int af; /* address family of remote target */
extern int mtrtype; /* type of query packet used */
extern int remoteport; /* target port for TCP tracing */
extern int tcp_timeout; /* timeout for TCP connections */
#ifdef SO_MARK
extern int mark; /* SO_MARK to set for ping packet*/
#endif
/* return the number of microseconds to wait before sending the next
ping */
int calc_deltatime (float waittime)
{
waittime /= numhosts;
return 1000000 * waittime;
}
/* This doesn't work for odd sz. I don't know enough about this to say
that this is wrong. It doesn't seem to cripple mtr though. -- REW */
int checksum(void *data, int sz)
{
unsigned short *ch;
unsigned int sum;
sum = 0;
ch = data;
sz = sz / 2;
while (sz--) {
sum += *(ch++);
}
sum = (sum >> 16) + (sum & 0xffff);
return (~sum & 0xffff);
}
/* Prepend pseudoheader to the udp datagram and calculate checksum */
int udp_checksum(void *pheader, void *udata, int psize, int dsize)
{
unsigned int tsize = psize + dsize;
char csumpacket[tsize];
memset(csumpacket, (unsigned char) abs(bitpattern), abs(tsize));
struct UDPv4PHeader *prepend = (struct UDPv4PHeader *) csumpacket;
struct UDPv4PHeader *udppheader = (struct UDPv4PHeader *) pheader;
prepend->saddr = udppheader->saddr;
prepend->daddr = udppheader->daddr;
prepend->zero = 0;
prepend->protocol = udppheader->protocol;
prepend->len = udppheader->len;
struct UDPHeader *content = (struct UDPHeader *)(csumpacket + psize);
struct UDPHeader *udpdata = (struct UDPHeader *) udata;
content->srcport = udpdata->srcport;
content->dstport = udpdata->dstport;
content->length = udpdata->length;
content->checksum = udpdata->checksum;
return checksum(csumpacket,tsize);
}
void save_sequence(int index, int seq)
{
display_rawxmit(index, seq);
sequence[seq].index = index;
sequence[seq].transit = 1;
sequence[seq].saved_seq = ++host[index].xmit;
memset(&sequence[seq].time, 0, sizeof(sequence[seq].time));
host[index].transit = 1;
if (host[index].sent)
host[index].up = 0;
host[index].sent = 1;
net_save_xmit(index);
}
int new_sequence(int index)
{
static int next_sequence = MinSequence;
int seq;
seq = next_sequence++;
if (next_sequence >= MaxSequence)
next_sequence = MinSequence;
save_sequence(index, seq);
return seq;
}
/* Attempt to connect to a TCP port with a TTL */
void net_send_tcp(int index)
{
int ttl, s;
int opt = 1;
int port;
struct sockaddr_storage local;
struct sockaddr_storage remote;
struct sockaddr_in *local4 = (struct sockaddr_in *) &local;
struct sockaddr_in6 *local6 = (struct sockaddr_in6 *) &local;
struct sockaddr_in *remote4 = (struct sockaddr_in *) &remote;
struct sockaddr_in6 *remote6 = (struct sockaddr_in6 *) &remote;
socklen_t len;
ttl = index + 1;
s = socket(af, SOCK_STREAM, 0);
if (s < 0) {
display_clear();
perror("socket()");
exit(EXIT_FAILURE);
}
memset(&local, 0, sizeof (local));
memset(&remote, 0, sizeof (remote));
local.ss_family = af;
remote.ss_family = af;
switch (af) {
case AF_INET:
addrcpy((void *) &local4->sin_addr, (void *) &ssa4->sin_addr, af);
addrcpy((void *) &remote4->sin_addr, (void *) remoteaddress, af);
remote4->sin_port = htons(remoteport);
len = sizeof (struct sockaddr_in);
break;
#ifdef ENABLE_IPV6
case AF_INET6:
addrcpy((void *) &local6->sin6_addr, (void *) &ssa6->sin6_addr, af);
addrcpy((void *) &remote6->sin6_addr, (void *) remoteaddress, af);
remote6->sin6_port = htons(remoteport);
len = sizeof (struct sockaddr_in6);
break;
#endif
}
if (bind(s, (struct sockaddr *) &local, len)) {
display_clear();
perror("bind()");
exit(EXIT_FAILURE);
}
if (getsockname(s, (struct sockaddr *) &local, &len)) {
display_clear();
perror("getsockname()");
exit(EXIT_FAILURE);
}
opt = 1;
if (ioctl(s, FIONBIO, &opt)) {
display_clear();
perror("ioctl FIONBIO");
exit(EXIT_FAILURE);
}
switch (af) {
case AF_INET:
if (setsockopt(s, IPPROTO_IP, IP_TTL, &ttl, sizeof (ttl))) {
display_clear();
perror("setsockopt IP_TTL");
exit(EXIT_FAILURE);
}
if (setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof (tos))) {
display_clear();
perror("setsockopt IP_TOS");
exit(EXIT_FAILURE);
}
break;
#ifdef ENABLE_IPV6
case AF_INET6:
if (setsockopt(s, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &ttl, sizeof (ttl))) {
display_clear();
perror("setsockopt IP_TTL");
exit(EXIT_FAILURE);
}
break;
#endif
}
#ifdef SO_MARK
if (mark >= 0 && setsockopt( s, SOL_SOCKET, SO_MARK, &mark, sizeof mark ) ) {
perror( "setsockopt SO_MARK" );
exit( EXIT_FAILURE );
}
#endif
switch (local.ss_family) {
case AF_INET:
port = ntohs(local4->sin_port);
break;
#ifdef ENABLE_IPV6
case AF_INET6:
port = ntohs(local6->sin6_port);
break;
#endif
default:
display_clear();
perror("unknown AF?");
exit(EXIT_FAILURE);
}
save_sequence(index, port);
gettimeofday(&sequence[port].time, NULL);
sequence[port].socket = s;
connect(s, (struct sockaddr *) &remote, len);
}
/* Attempt to connect to a SCTP port with a TTL */
void net_send_sctp(int index)
{
int ttl, s;
int opt = 1;
int port;
struct sockaddr_storage local;
struct sockaddr_storage remote;
struct sockaddr_in *local4 = (struct sockaddr_in *) &local;
struct sockaddr_in6 *local6 = (struct sockaddr_in6 *) &local;
struct sockaddr_in *remote4 = (struct sockaddr_in *) &remote;
struct sockaddr_in6 *remote6 = (struct sockaddr_in6 *) &remote;
socklen_t len;
ttl = index + 1;
s = socket(af, SOCK_STREAM, IPPROTO_SCTP);
if (s < 0) {
display_clear();
perror("socket()");
exit(EXIT_FAILURE);
}
memset(&local, 0, sizeof (local));
memset(&remote, 0, sizeof (remote));
local.ss_family = af;
remote.ss_family = af;
switch (af) {
case AF_INET:
addrcpy((void *) &local4->sin_addr, (void *) &ssa4->sin_addr, af);
addrcpy((void *) &remote4->sin_addr, (void *) remoteaddress, af);
remote4->sin_port = htons(remoteport);
len = sizeof (struct sockaddr_in);
break;
#ifdef ENABLE_IPV6
case AF_INET6:
addrcpy((void *) &local6->sin6_addr, (void *) &ssa6->sin6_addr, af);
addrcpy((void *) &remote6->sin6_addr, (void *) remoteaddress, af);
remote6->sin6_port = htons(remoteport);
len = sizeof (struct sockaddr_in6);
break;
#endif
}
if (bind(s, (struct sockaddr *) &local, len)) {
display_clear();
perror("bind()");
exit(EXIT_FAILURE);
}
if (getsockname(s, (struct sockaddr *) &local, &len)) {
display_clear();
perror("getsockname()");
exit(EXIT_FAILURE);
}
opt = 1;
if (ioctl(s, FIONBIO, &opt)) {
display_clear();
perror("ioctl FIONBIO");
exit(EXIT_FAILURE);
}
switch (af) {
case AF_INET:
if (setsockopt(s, IPPROTO_IP, IP_TTL, &ttl, sizeof (ttl))) {
display_clear();
perror("setsockopt IP_TTL");
exit(EXIT_FAILURE);
}
if (setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof (tos))) {
display_clear();
perror("setsockopt IP_TOS");
exit(EXIT_FAILURE);
}
break;
#ifdef ENABLE_IPV6
case AF_INET6:
if (setsockopt(s, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &ttl, sizeof (ttl))) {
display_clear();
perror("setsockopt IP_TTL");
exit(EXIT_FAILURE);
}
break;
#endif
}
#ifdef SO_MARK
if (mark >= 0 && setsockopt( s, SOL_SOCKET, SO_MARK, &mark, sizeof mark ) ) {
perror( "setsockopt SO_MARK" );
exit( EXIT_FAILURE );
}
#endif
switch (local.ss_family) {
case AF_INET:
port = ntohs(local4->sin_port);
break;
#ifdef ENABLE_IPV6
case AF_INET6:
port = ntohs(local6->sin6_port);
break;
#endif
default:
display_clear();
perror("unknown AF?");
exit(EXIT_FAILURE);
}
save_sequence(index, port);
gettimeofday(&sequence[port].time, NULL);
sequence[port].socket = s;
connect(s, (struct sockaddr *) &remote, len);
}
/* Attempt to find the host at a particular number of hops away */
void net_send_query(int index)
{
if (mtrtype == IPPROTO_TCP) {
net_send_tcp(index);
return;
}
if (mtrtype == IPPROTO_SCTP) {
net_send_sctp(index);
return;
}
/*ok char packet[sizeof(struct IPHeader) + sizeof(struct ICMPHeader)];*/
char packet[MAXPACKET];
struct IPHeader *ip = (struct IPHeader *) packet;
struct ICMPHeader *icmp = NULL;
struct UDPHeader *udp = NULL;
struct UDPv4PHeader *udpp = NULL;
uint16 mypid;
/*ok int packetsize = sizeof(struct IPHeader) + sizeof(struct ICMPHeader) + datasize;*/
int rv;
static int first=1;
int ttl, iphsize = 0, echotype = 0, salen = 0;
ttl = index + 1;
#ifdef ENABLE_IPV6
/* offset for ipv6 checksum calculation */
int offset = 6;
#endif
if ( packetsize < MINPACKET ) packetsize = MINPACKET;
if ( packetsize > MAXPACKET ) packetsize = MAXPACKET;
memset(packet, (unsigned char) abs(bitpattern), abs(packetsize));
switch ( af ) {
case AF_INET:
#if !defined(IP_HDRINCL) && defined(IP_TOS) && defined(IP_TTL)
iphsize = 0;
if ( setsockopt( sendsock, IPPROTO_IP, IP_TOS, &tos, sizeof tos ) ) {
perror( "setsockopt IP_TOS" );
exit( EXIT_FAILURE );
}
if ( setsockopt( sendsock, IPPROTO_IP, IP_TTL, &ttl, sizeof ttl ) ) {
perror( "setsockopt IP_TTL" );
exit( EXIT_FAILURE );
}
#else
iphsize = sizeof (struct IPHeader);
ip->version = 0x45;
ip->tos = tos;
ip->len = BSDfix ? abs(packetsize): htons (abs(packetsize));
ip->id = 0;
ip->frag = 0; /* 1, if want to find mtu size? Min */
ip->ttl = ttl;
ip->protocol = mtrtype;
ip->check = 0;
/* BSD needs the source address here, Linux & others do not... */
addrcpy( (void *) &(ip->saddr), (void *) &(ssa4->sin_addr), AF_INET );
addrcpy( (void *) &(ip->daddr), (void *) remoteaddress, AF_INET );
#endif
echotype = ICMP_ECHO;
salen = sizeof (struct sockaddr_in);
break;
#ifdef ENABLE_IPV6
case AF_INET6:
iphsize = 0;
if ( setsockopt( sendsock, IPPROTO_IPV6, IPV6_UNICAST_HOPS,
&ttl, sizeof ttl ) ) {
perror( "setsockopt IPV6_UNICAST_HOPS" );
exit( EXIT_FAILURE);
}
echotype = ICMP6_ECHO_REQUEST;
salen = sizeof (struct sockaddr_in6);
break;
#endif
}
#ifdef SO_MARK
if (mark >= 0 && setsockopt( sendsock, SOL_SOCKET, SO_MARK, &mark, sizeof mark ) ) {
perror( "setsockopt SO_MARK" );
exit( EXIT_FAILURE );
}
#endif
switch ( mtrtype ) {
case IPPROTO_ICMP:
icmp = (struct ICMPHeader *)(packet + iphsize);
icmp->type = echotype;
icmp->code = 0;
icmp->checksum = 0;
icmp->id = getpid();
icmp->sequence = new_sequence(index);
icmp->checksum = checksum(icmp, abs(packetsize) - iphsize);
gettimeofday(&sequence[icmp->sequence].time, NULL);
break;
case IPPROTO_UDP:
udp = (struct UDPHeader *)(packet + iphsize);
udp->checksum = 0;
mypid = (uint16)getpid();
if (mypid < MinPort)
mypid += MinPort;
udp->srcport = htons(mypid);
udp->length = abs(packetsize) - iphsize;
if(!BSDfix)
udp->length = htons(udp->length);
udp->dstport = new_sequence(index);
gettimeofday(&sequence[udp->dstport].time, NULL);
udp->dstport = htons(udp->dstport);
break;
}
switch ( af ) {
case AF_INET:
switch ( mtrtype ) {
case IPPROTO_UDP:
/* checksum is not mandatory. only calculate if we know ip->saddr */
if (ip->saddr) {
udpp = (struct UDPv4PHeader *)(malloc(sizeof(struct UDPv4PHeader)));
udpp->saddr = ip->saddr;
udpp->daddr = ip->daddr;
udpp->protocol = ip->protocol;
udpp->len = udp->length;
udp->checksum = udp_checksum(udpp, udp, sizeof(struct UDPv4PHeader), abs(packetsize) - iphsize);
}
break;
}
ip->check = checksum(packet, abs(packetsize));
break;
#ifdef ENABLE_IPV6
case AF_INET6:
switch ( mtrtype ) {
case IPPROTO_UDP:
/* kernel checksum calculation */
if ( setsockopt(sendsock, IPPROTO_IPV6, IPV6_CHECKSUM, &offset, sizeof(offset)) ) {
perror( "setsockopt IPV6_CHECKSUM" );
exit( EXIT_FAILURE);
}
break;
}
break;
#endif
}
rv = sendto(sendsock, packet, abs(packetsize), 0,
remotesockaddr, salen);
if (first && (rv < 0) && ((errno == EINVAL) || (errno == EMSGSIZE))) {
/* Try the first packet again using host byte order. */
ip->len = abs (packetsize);
rv = sendto(sendsock, packet, abs(packetsize), 0,
remotesockaddr, salen);
if (rv >= 0) {
BSDfix = 1;
}
}
first = 0;
}
/* We got a return on something we sent out. Record the address and
time. */
void net_process_ping(int seq, struct mplslen mpls, void * addr, struct timeval now)
{
int index;
int totusec;
int oldavg; /* usedByMin */
int oldjavg; /* usedByMin */
int i; /* usedByMin */
#ifdef ENABLE_IPV6
char addrcopy[sizeof(struct in6_addr)];
#else
char addrcopy[sizeof(struct in_addr)];
#endif
/* Copy the from address ASAP because it can be overwritten */
addrcpy( (void *) &addrcopy, addr, af );
if (seq < 0 || seq >= MaxSequence)
return;
if (!sequence[seq].transit)
return;
sequence[seq].transit = 0;
if (sequence[seq].socket > 0) {
close(sequence[seq].socket);
sequence[seq].socket = 0;
}
index = sequence[seq].index;
totusec = (now.tv_sec - sequence[seq].time.tv_sec ) * 1000000 +
(now.tv_usec - sequence[seq].time.tv_usec);
/* impossible? if( totusec < 0 ) totusec = 0 */;
if ( addrcmp( (void *) &(host[index].addr),
(void *) &unspec_addr, af ) == 0 ) {
/* should be out of if as addr can change */
addrcpy( (void *) &(host[index].addr), addrcopy, af );
host[index].mpls = mpls;
display_rawhost(index, (void *) &(host[index].addr));
/* multi paths */
addrcpy( (void *) &(host[index].addrs[0]), addrcopy, af );
host[index].mplss[0] = mpls;
} else {
for( i=0; i<MAXPATH; ) {
if( addrcmp( (void *) &(host[index].addrs[i]), (void *) &addrcopy,
af ) == 0 ||
addrcmp( (void *) &(host[index].addrs[i]),
(void *) &unspec_addr, af ) == 0 ) break;
i++;
}
if( addrcmp( (void *) &(host[index].addrs[i]), addrcopy, af ) != 0 &&
i<MAXPATH ) {
addrcpy( (void *) &(host[index].addrs[i]), addrcopy, af );
host[index].mplss[i] = mpls;
display_rawhost(index, (void *) &(host[index].addrs[i]));
}
}
host[index].jitter = totusec - host[index].last;
if (host[index].jitter < 0 ) host[index].jitter = - host[index].jitter;
host[index].last = totusec;
if (host[index].returned < 1) {
host[index].best = host[index].worst = host[index].gmean = totusec;
host[index].avg = host[index].var = 0;
host[index].jitter = host[index].jworst = host[index].jinta= 0;
}
/* some time best can be too good to be true, experienced
* at least in linux 2.4.x.
* safe guard 1) best[index]>=best[index-1] if index>0
* 2) best >= average-20,000 usec (good number?)
if (index > 0) {
if (totusec < host[index].best &&
totusec>= host[index-1].best) host[index].best = totusec;
} else {
if(totusec < host[index].best) host[index].best = totusec;
}
*/
if (totusec < host[index].best ) host[index].best = totusec;
if (totusec > host[index].worst) host[index].worst = totusec;
if (host[index].jitter > host[index].jworst)
host[index].jworst = host[index].jitter;
host[index].returned++;
oldavg = host[index].avg;
host[index].avg += (totusec - oldavg +.0) / host[index].returned;
host[index].var += (totusec - oldavg +.0) * (totusec - host[index].avg) / 1000000;
oldjavg = host[index].javg;
host[index].javg += (host[index].jitter - oldjavg) / host[index].returned;
/* below algorithm is from rfc1889, A.8 */
host[index].jinta += host[index].jitter - ((host[index].jinta + 8) >> 4);
if ( host[index].returned > 1 )
host[index].gmean = pow( (double) host[index].gmean, (host[index].returned-1.0)/host[index].returned )
* pow( (double) totusec, 1.0/host[index].returned );
host[index].sent = 0;
host[index].up = 1;
host[index].transit = 0;
net_save_return(index, sequence[seq].saved_seq, totusec);
display_rawping(index, totusec, seq);
}
/* We know a packet has come in, because the main select loop has called us,
now we just need to read it, see if it is for us, and if it is a reply
to something we sent, then call net_process_ping() */
void net_process_return(void)
{
char packet[MAXPACKET];
#ifdef ENABLE_IPV6
struct sockaddr_storage fromsockaddr_struct;
struct sockaddr_in6 * fsa6 = (struct sockaddr_in6 *) &fromsockaddr_struct;
#else
struct sockaddr_in fromsockaddr_struct;
#endif
struct sockaddr * fromsockaddr = (struct sockaddr *) &fromsockaddr_struct;
struct sockaddr_in * fsa4 = (struct sockaddr_in *) &fromsockaddr_struct;
socklen_t fromsockaddrsize;
int num;
struct ICMPHeader *header = NULL;
struct UDPHeader *udpheader = NULL;
struct TCPHeader *tcpheader = NULL;
struct SCTPHeader *sctpheader = NULL;
struct timeval now;
ip_t * fromaddress = NULL;
int echoreplytype = 0, timeexceededtype = 0, unreachabletype = 0;
int sequence = 0;
/* MPLS decoding */
struct mplslen mpls;
mpls.labels = 0;
gettimeofday(&now, NULL);
switch ( af ) {
case AF_INET:
fromsockaddrsize = sizeof (struct sockaddr_in);
fromaddress = (ip_t *) &(fsa4->sin_addr);
echoreplytype = ICMP_ECHOREPLY;
timeexceededtype = ICMP_TIME_EXCEEDED;
unreachabletype = ICMP_UNREACHABLE;
break;
#ifdef ENABLE_IPV6
case AF_INET6:
fromsockaddrsize = sizeof (struct sockaddr_in6);
fromaddress = (ip_t *) &(fsa6->sin6_addr);
echoreplytype = ICMP6_ECHO_REPLY;
timeexceededtype = ICMP6_TIME_EXCEEDED;
unreachabletype = ICMP6_DST_UNREACH;
break;
#endif
}
num = recvfrom(recvsock, packet, MAXPACKET, 0,
fromsockaddr, &fromsockaddrsize);
switch ( af ) {
case AF_INET:
if((size_t) num < sizeof(struct IPHeader) + sizeof(struct ICMPHeader))
return;
header = (struct ICMPHeader *)(packet + sizeof(struct IPHeader));
break;
#ifdef ENABLE_IPV6
case AF_INET6:
if(num < sizeof(struct ICMPHeader))
return;
header = (struct ICMPHeader *) packet;
break;
#endif
}
switch ( mtrtype ) {
case IPPROTO_ICMP:
if (header->type == echoreplytype) {
if(header->id != (uint16)getpid())
return;
sequence = header->sequence;
} else if (header->type == timeexceededtype) {
switch ( af ) {
case AF_INET:
if ((size_t) num < sizeof(struct IPHeader) +
sizeof(struct ICMPHeader) +
sizeof (struct IPHeader) +
sizeof (struct ICMPHeader))
return;
header = (struct ICMPHeader *)(packet + sizeof (struct IPHeader) +
sizeof (struct ICMPHeader) +
sizeof (struct IPHeader));
if(num > 160)
decodempls(num, packet, &mpls, 156);
break;
#ifdef ENABLE_IPV6
case AF_INET6:
if ( num < sizeof (struct ICMPHeader) +
sizeof (struct ip6_hdr) + sizeof (struct ICMPHeader) )
return;
header = (struct ICMPHeader *) ( packet +
sizeof (struct ICMPHeader) +
sizeof (struct ip6_hdr) );
if(num > 140)
decodempls(num, packet, &mpls, 136);
break;
#endif
}
if (header->id != (uint16)getpid())
return;
sequence = header->sequence;
}
break;
case IPPROTO_UDP:
if (header->type == timeexceededtype || header->type == unreachabletype) {
switch ( af ) {
case AF_INET:
if ((size_t) num < sizeof(struct IPHeader) +
sizeof(struct ICMPHeader) +
sizeof (struct IPHeader) +
sizeof (struct UDPHeader))
return;
udpheader = (struct UDPHeader *)(packet + sizeof (struct IPHeader) +
sizeof (struct ICMPHeader) +
sizeof (struct IPHeader));
if(num > 160)
decodempls(num, packet, &mpls, 156);
break;
#ifdef ENABLE_IPV6
case AF_INET6:
if ( num < sizeof (struct ICMPHeader) +
sizeof (struct ip6_hdr) + sizeof (struct UDPHeader) )
return;
udpheader = (struct UDPHeader *) ( packet +
sizeof (struct ICMPHeader) +
sizeof (struct ip6_hdr) );
if(num > 140)
decodempls(num, packet, &mpls, 136);
break;
#endif
}
sequence = ntohs(udpheader->dstport);
}
break;
case IPPROTO_TCP:
if (header->type == timeexceededtype || header->type == unreachabletype) {
switch ( af ) {
case AF_INET:
if ((size_t) num < sizeof(struct IPHeader) +
sizeof(struct ICMPHeader) +
sizeof (struct IPHeader) +
sizeof (struct TCPHeader))
return;
tcpheader = (struct TCPHeader *)(packet + sizeof (struct IPHeader) +
sizeof (struct ICMPHeader) +
sizeof (struct IPHeader));
if(num > 160)
decodempls(num, packet, &mpls, 156);
break;
#ifdef ENABLE_IPV6
case AF_INET6:
if ( num < sizeof (struct ICMPHeader) +
sizeof (struct ip6_hdr) + sizeof (struct TCPHeader) )
return;
tcpheader = (struct TCPHeader *) ( packet +
sizeof (struct ICMPHeader) +