Apple-2-SW/contiki
1
0
Fork 0
mirror of https://github.com/oliverschmidt/contiki.git synced 2024-12-23 01:29:33 +00:00
Code Issues Projects Releases Wiki Activity

Added optional transmission of ICMP destimation unreachable in response to incoming UDP packets with an destination port that is not open. This is needed for correct operation of traceroute

Browse Source
This commit is contained in:
adamdunkels 2008-01-24 23:08:58 +00:00
parent c9508567a1
commit 6e89e545b3
2 changed files with 36 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

35
core/net/uip.c
View File

@ -41,7 +41,7 @@
*
* This file is part of the uIP TCP/IP stack.
*
* $Id: uip.c,v 1.9 2007/11/28 12:53:07 adamdunkels Exp $
* $Id: uip.c,v 1.10 2008/01/24 23:08:58 adamdunkels Exp $
*
*/
@ -196,6 +196,9 @@ static u16_t tmp16;
#define ICMP_ECHO_REPLY 0
#define ICMP_ECHO 8
#define ICMP_DEST_UNREACHABLE 3
#define ICMP_PORT_UNREACHABLE 3
#define ICMP6_ECHO_REPLY 129
#define ICMP6_ECHO 128
#define ICMP6_NEIGHBOR_SOLICITATION 135
@ -1104,7 +1107,37 @@ uip_process(u8_t flag)
}
}
UIP_LOG("udp: no matching connection found");
#if UIP_CONF_ICMP_DEST_UNREACH && !UIP_CONF_IPV6
/* Copy fields from packet header into payload of this ICMP packet. */
memcpy(&(ICMPBUF->payload[0]), ICMPBUF, UIP_IPH_LEN + 8);
/* Set the ICMP type and code. */
ICMPBUF->type = ICMP_DEST_UNREACHABLE;
ICMPBUF->icode = ICMP_PORT_UNREACHABLE;
/* Calculate the ICMP checksum. */
ICMPBUF->icmpchksum = 0;
ICMPBUF->icmpchksum = ~uip_chksum((u16_t *)&(ICMPBUF->type), 36);
/* Set the IP destination address to be the source address of the
original packet. */
uip_ipaddr_copy(&BUF->destipaddr, &BUF->srcipaddr);
/* Set our IP address as the source address. */
uip_ipaddr_copy(&BUF->srcipaddr, &uip_hostaddr);
/* The size of the ICMP destination unreachable packet is 36 + the
size of the IP header (20) = 56. */
uip_len = 36 + UIP_IPH_LEN;
ICMPBUF->len[0] = 0;
ICMPBUF->len[1] = (u8_t)uip_len;
ICMPBUF->ttl = UIP_TTL;
ICMPBUF->proto = UIP_PROTO_ICMP;
goto ip_send_nolen;
#else /* UIP_CONF_ICMP_DEST_UNREACH */
goto drop;
#endif /* UIP_CONF_ICMP_DEST_UNREACH */
udp_found:
uip_conn = NULL;

3
core/net/uip.h
View File

@ -46,7 +46,7 @@
*
* This file is part of the uIP TCP/IP stack.
*
* $Id: uip.h,v 1.13 2007/11/28 12:52:12 adamdunkels Exp $
* $Id: uip.h,v 1.14 2008/01/24 23:08:58 adamdunkels Exp $
*
*/
@ -1497,6 +1497,7 @@ struct uip_icmpip_hdr {
u16_t icmpchksum;
#if !UIP_CONF_IPV6
u16_t id, seqno;
u8_t payload[1];
#else /* !UIP_CONF_IPV6 */
u8_t flags, reserved1, reserved2, reserved3;
u8_t icmp6data[16];