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Block NS echoback from interface

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This commit is contained in:
dak664 2009-08-13 18:41:00 +00:00
parent f78c9d6a20
commit d2a6637627
1 changed files with 22 additions and 13 deletions
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35
cpu/native/net/wpcap.c
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@ -30,7 +30,7 @@
* *
* Author: Oliver Schmidt <ol.sc@web.de> * Author: Oliver Schmidt <ol.sc@web.de>
* *
* $Id: wpcap.c,v 1.17 2009/08/11 16:06:17 dak664 Exp $ * $Id: wpcap.c,v 1.18 2009/08/13 18:41:00 dak664 Exp $
*/ */
#define WIN32_LEAN_AND_MEAN #define WIN32_LEAN_AND_MEAN
@ -145,6 +145,7 @@ init_pcap(struct in_addr addr)
if(pcap == NULL) { if(pcap == NULL) {
error_exit(error); error_exit(error);
} }
// pcap_setdirection(PCAP_D_IN); //Not implemented in windows yet?
return; return;
} }
} }
@ -255,6 +256,7 @@ wpcap_init(void)
set_ethaddr(addr); set_ethaddr(addr);
} }
/*---------------------------------------------------------------------------*/ /*---------------------------------------------------------------------------*/
u16_t u16_t
wpcap_poll(void) wpcap_poll(void)
@ -269,19 +271,36 @@ wpcap_poll(void)
return 0; return 0;
} }
#if UIP_CONF_IPV6
/* Since pcap_setdirection(PCAP_D_IN) is not implemented in winpcap all outgoing packets
* will be echoed back. The stack will ignore any packets not addressed to it, but initial
* ipv6 neighbor solicitations are addressed to everyone and the echoed NS sent on startup
* would be processed as a conflicting NS race which would cause a stack shutdown.
* So discard all packets with our source address (packet starts destaddr, srcaddr, ...)
*
*/
int i;
for (i=0;i<UIP_LLADDR_LEN;i++) if (*(packet+UIP_LLADDR_LEN+i)!=uip_lladdr.addr[i]) break;
if (i==UIP_LLADDR_LEN) {
PRINTF("Discarding echoed packet\n");
return 0;
}
#endif /* UIP_CONF_IPV6 */
if(packet_header->caplen > UIP_BUFSIZE) { if(packet_header->caplen > UIP_BUFSIZE) {
return 0; return 0;
} }
CopyMemory(uip_buf, packet, packet_header->caplen); CopyMemory(uip_buf, packet, packet_header->caplen);
return (u16_t)packet_header->caplen; return (u16_t)packet_header->caplen;
} }
/*---------------------------------------------------------------------------*/ /*---------------------------------------------------------------------------*/
#if UIP_CONF_IPV6 #if UIP_CONF_IPV6
u8_t u8_t
wpcap_send(uip_lladdr_t *lladdr) wpcap_send(uip_lladdr_t *lladdr)
{ {
static char cludge=0;
if(lladdr == NULL) { if(lladdr == NULL) {
/* the dest must be multicast*/ /* the dest must be multicast*/
(&BUF->dest)->addr[0] = 0x33; (&BUF->dest)->addr[0] = 0x33;
@ -295,15 +314,6 @@ wpcap_send(uip_lladdr_t *lladdr)
} }
memcpy(&BUF->src, &uip_lladdr, UIP_LLADDR_LEN); memcpy(&BUF->src, &uip_lladdr, UIP_LLADDR_LEN);
/* TODO:After sending the initial NS a NS is received from 0 to me with my target address.
* This causes program exit -1 via uip_netif_dad_failed() from uip-nd6-io.c.
* It is OK once it receives an incoming packet
* Swallowing the first few output packets will (usually) get it going
* This is a cludge until the NS processing is resolved!
*/
if (cludge<3) {
cludge++; //gulp
} else {
PRINTF("Src= %02x %02x %02x %02x %02x %02x",(&BUF->src)->addr[0],(&BUF->src)->addr[1],(&BUF->src)->addr[2],(&BUF->src)->addr[3],(&BUF->src)->addr[4],(&BUF->src)->addr[5]); PRINTF("Src= %02x %02x %02x %02x %02x %02x",(&BUF->src)->addr[0],(&BUF->src)->addr[1],(&BUF->src)->addr[2],(&BUF->src)->addr[3],(&BUF->src)->addr[4],(&BUF->src)->addr[5]);
PRINTF(" Dst= %02x %02x %02x %02x %02x %02x",(&BUF->dest)->addr[0],(&BUF->dest)->addr[1],(&BUF->dest)->addr[2],(&BUF->dest)->addr[3],(&BUF->dest)->addr[4],(&BUF->dest)->addr[5]); PRINTF(" Dst= %02x %02x %02x %02x %02x %02x",(&BUF->dest)->addr[0],(&BUF->dest)->addr[1],(&BUF->dest)->addr[2],(&BUF->dest)->addr[3],(&BUF->dest)->addr[4],(&BUF->dest)->addr[5]);
PRINTF(" Type=%04x\n",BUF->type); PRINTF(" Type=%04x\n",BUF->type);
@ -312,9 +322,8 @@ if (cludge<3) {
if(pcap_sendpacket(pcap, uip_buf, uip_len) == -1) { if(pcap_sendpacket(pcap, uip_buf, uip_len) == -1) {
error_exit("error on send\n"); error_exit("error on send\n");
} }
}
return 0; return 0;
} /* cludge */ }
#else /* UIP_CONF_IPV6 */ #else /* UIP_CONF_IPV6 */
void void
wpcap_send(void) wpcap_send(void)