Decrease TTL for forwarded packets
This commit is contained in:
parent
3106840c56
commit
57f2dfa743
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@ -1,8 +1,12 @@
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CFLAGS=-Wall -Werror -I../../core -I.
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CONTIKI=../..
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CFLAGS=-Wall -Werror -I$(CONTIKI)/core -I.
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all: wpcapslip
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wpcapslip: wpcapslip.o wpcap.o
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vpath %.c $(CONTIKI)/core/net
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wpcapslip: wpcapslip.o wpcap.o tcpdump.o
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%: %.o
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$(CC) $(LDFLAGS) $^ /lib/w32api/libws2_32.a /lib/w32api/libiphlpapi.a -o $@
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@ -10,6 +10,8 @@ typedef uint32_t u32_t;
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typedef int32_t s32_t;
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typedef unsigned short uip_stats_t;
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#define UIP_CONF_UIP_IP4ADDR_T_WITH_U32 1
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typedef unsigned long clock_time_t;
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#define CLOCK_CONF_SECOND 1000
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@ -30,7 +30,7 @@
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*
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* Author: Oliver Schmidt <ol.sc@web.de>
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*
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* $Id: wpcap.c,v 1.1 2008/02/07 09:39:35 adamdunkels Exp $
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* $Id: wpcap.c,v 1.2 2008/02/24 21:14:25 adamdunkels Exp $
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*/
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@ -471,14 +471,14 @@ do_arp(void *buf, int len)
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if(hdr->ethhdr.type == HTONS(UIP_ETHTYPE_ARP)) {
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if(hdr->opcode == HTONS(ARP_REQUEST)) {
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/* Check if the ARP is for our network */
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printf("ARP for %d.%d.%d.%d we are %d.%d.%d.%d/%d.%d.%d.%d\n",
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/* printf("ARP for %d.%d.%d.%d we are %d.%d.%d.%d/%d.%d.%d.%d\n",
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uip_ipaddr_to_quad(&hdr->dipaddr),
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uip_ipaddr_to_quad(&netaddr),
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uip_ipaddr_to_quad(&netmask));
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uip_ipaddr_to_quad(&netmask));*/
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if(uip_ipaddr_maskcmp(&hdr->dipaddr, &netaddr, &netmask)) {
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uip_ipaddr_t tmpaddr;
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printf("ARP for us.\n");
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/* printf("ARP for us.\n");*/
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uip_arp_update(&hdr->sipaddr, &hdr->shwaddr);
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hdr->opcode = HTONS(ARP_REPLY);
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@ -30,7 +30,7 @@
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*
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* Author: Oliver Schmidt <ol.sc@web.de>
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*
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* $Id: wpcapslip.c,v 1.1 2008/02/07 09:39:35 adamdunkels Exp $
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* $Id: wpcapslip.c,v 1.2 2008/02/24 21:14:25 adamdunkels Exp $
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*/
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@ -71,6 +71,21 @@ void wpcap_send(void *buf, int len);
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uint16_t wpcap_poll(char **buf);
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#include "net/tcpdump.h"
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static int should_print = 0;
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#define IP_HLEN 20
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/*---------------------------------------------------------------------------*/
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static void
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print_packet(uint8_t *packet, int len)
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{
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char buf[2000];
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if(should_print) {
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tcpdump_format(packet, len, buf, sizeof(buf));
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printf("%s\n", buf);
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}
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}
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/*---------------------------------------------------------------------------*/
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void cleanup(void);
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/*---------------------------------------------------------------------------*/
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@ -109,7 +124,7 @@ struct ip {
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u_int16_t uh_sum; /* udp checksum */
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};
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static int ip_id;
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static int ip_id, last_id;
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int
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ssystem(const char *fmt, ...) __attribute__((__format__ (__printf__, 1, 2)));
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@ -163,6 +178,12 @@ ip4sum(u_int16_t sum, const void *_p, u_int16_t len)
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return sum;
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}
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static uint16_t
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chksum(const void *p, uint16_t len)
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{
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uint16_t sum = ip4sum(0, p, len);
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return (sum == 0) ? 0xffff : htons(sum);
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}
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int
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check_ip(const struct ip *ip, unsigned ip_len)
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@ -170,20 +191,24 @@ check_ip(const struct ip *ip, unsigned ip_len)
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u_int16_t sum, ip_hl;
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/* Check IP version and length. */
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if((ip->ip_vhl & IP_V) != IP_V4)
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if((ip->ip_vhl & IP_V) != IP_V4) {
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return -1;
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}
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if(ntohs(ip->ip_len) > ip_len)
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if(ntohs(ip->ip_len) > ip_len) {
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return -2;
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}
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if(ntohs(ip->ip_len) < ip_len)
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if(ntohs(ip->ip_len) < ip_len) {
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return -3;
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}
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/* Check IP header. */
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ip_hl = 4*(ip->ip_vhl & IP_HL);
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sum = ip4sum(0, ip, ip_hl);
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if(sum != 0xffff && sum != 0x0)
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if(sum != 0xffff && sum != 0x0) {
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return -4;
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}
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if(ip->ip_p == 6 || ip->ip_p == 17) { /* Check TCP or UDP header. */
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u_int16_t tcp_len = ip_len - ip_hl;
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@ -196,21 +221,23 @@ check_ip(const struct ip *ip, unsigned ip_len)
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sum = ip4sum(sum, (u_int8_t*)ip + ip_hl, tcp_len);
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/* Failed checksum test? */
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if (sum != 0xffff && sum != 0x0) {
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if (ip->ip_p == 6) { /* TCP == 6 */
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if(sum != 0xffff && sum != 0x0) {
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if(ip->ip_p == 6) { /* TCP == 6 */
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return -5;
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} else { /* UDP */
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/* Deal with disabled UDP checksums. */
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if (ip->uh_sum != 0)
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if(ip->uh_sum != 0) {
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return -6;
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}
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}
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}
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} else if (ip->ip_p == 1) { /* ICMP */
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u_int16_t icmp_len = ip_len - ip_hl;
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sum = ip4sum(0, (u_int8_t*)ip + ip_hl, icmp_len);
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if(sum != 0xffff && sum != 0x0)
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if(sum != 0xffff && sum != 0x0) {
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return -7;
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}
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}
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return 0;
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}
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@ -331,6 +358,7 @@ serial_to_wpcap(FILE *inslip)
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err(1, "serial_to_tun: write");
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}*/
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/* printf("Sending to wpcap\n");*/
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print_packet(uip.inbuf, inbufptr);
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wpcap_send(uip.inbuf, inbufptr);
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/* printf("After sending to wpcap\n");*/
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inbufptr = 0;
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@ -429,11 +457,25 @@ write_to_serial(int outfd, void *inbuf, int len)
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}
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ecode = check_ip(inbuf, len);
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if(ecode < 0) {
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fprintf(stderr, "tun_to_serial: drop packet %d\n", ecode);
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fprintf(stderr, "write_to_serial: drop packet %d\n", ecode);
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return;
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}
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}
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iphdr->ip_ttl = htons(htons(iphdr->ip_ttl) + 1);
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if(iphdr->ip_ttl == 0) {
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fprintf(stderr, "Packet with ttl %d dropped\n", iphdr->ip_ttl);
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return;
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}
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iphdr->ip_sum = 0;
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iphdr->ip_sum = ~chksum(iphdr, 4 * (iphdr->ip_vhl & IP_HL));
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ecode = check_ip(inbuf, len);
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if(ecode < 0) {
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fprintf(stderr, "write_to_serial: drop packet %d\n", ecode);
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return;
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}
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/* It would be ``nice'' to send a SLIP_END here but it's not
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* really necessary.
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*/
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@ -456,6 +498,7 @@ write_to_serial(int outfd, void *inbuf, int len)
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}
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slip_send(outfd, SLIP_END);
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/* printf("slip end\n");*/
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PROGRESS("t");
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}
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/*---------------------------------------------------------------------------*/
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@ -626,7 +669,7 @@ main(int argc, char **argv)
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setvbuf(stdout, NULL, _IOLBF, 0); /* Line buffered output. */
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while((c = getopt(argc, argv, "B:D:hs:t:")) != -1) {
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while((c = getopt(argc, argv, "B:D:hs:t:T")) != -1) {
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switch (c) {
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case 'B':
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baudrate = atoi(optarg);
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}
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break;
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#endif /* 0 */
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case 'T':
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should_print = 1;
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break;
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case '?':
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case 'h':
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default:
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err(1, "usage: wpcapslip [-B baudrate] [-s siodev] [-D dhcp-server] ipaddress netmask [dhcp-server]");
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err(1, "usage: wpcapslip [-B baudrate] [-s siodev] [-D dhcp-server] [-T] ipaddress netmask [dhcp-server]");
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break;
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}
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}
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argv += (optind - 1);
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if(argc != 4) {
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err(1, "usage: wpcapslip [-s siodev] [-D dhcp-server] <IP address of local Ethernet card> <IP address of SLIP network> <netmask of SLIP network>");
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err(1, "usage: wpcapslip [-s siodev] [-D dhcp-server] [-T] <IP address of local Ethernet card> <IP address of SLIP network> <netmask of SLIP network>");
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}
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/* ipaddr = argv[1];
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netmask = argv[2];*/
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ret = wpcap_poll(&pbuf);
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if(ret > 0) {
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/* printf("wpcap_poll ret %d", ret);
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printf("IP packet\n");*/
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write_to_serial(slipfd, pbuf, ret);
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slip_flushbuf(slipfd);
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sigalarm_reset();
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struct ip *iphdr = (struct ip *)pbuf;
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if(iphdr->ip_id != last_id) {
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last_id = iphdr->ip_id;
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/* printf("------ wpcap_poll ret %d\n", ret);*/
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print_packet(pbuf, ret);
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write_to_serial(slipfd, pbuf, ret);
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slip_flushbuf(slipfd);
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sigalarm_reset();
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}
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}
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/* } else {
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printf("!slip_empty\n");*/
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