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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
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@ -41,7 +41,7 @@
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*
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*
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* This file is part of the uIP TCP/IP stack.
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* This file is part of the uIP TCP/IP stack.
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*
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*
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* $Id: uip.c,v 1.9 2007/11/28 12:53:07 adamdunkels Exp $
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* $Id: uip.c,v 1.10 2008/01/24 23:08:58 adamdunkels Exp $
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*
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*
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*/
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*/
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@ -196,6 +196,9 @@ static u16_t tmp16;
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#define ICMP_ECHO_REPLY 0
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#define ICMP_ECHO_REPLY 0
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#define ICMP_ECHO 8
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#define ICMP_ECHO 8
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#define ICMP_DEST_UNREACHABLE 3
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#define ICMP_PORT_UNREACHABLE 3
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#define ICMP6_ECHO_REPLY 129
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#define ICMP6_ECHO_REPLY 129
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#define ICMP6_ECHO 128
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#define ICMP6_ECHO 128
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#define ICMP6_NEIGHBOR_SOLICITATION 135
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#define ICMP6_NEIGHBOR_SOLICITATION 135
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@ -1104,7 +1107,37 @@ uip_process(u8_t flag)
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}
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}
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}
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}
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UIP_LOG("udp: no matching connection found");
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UIP_LOG("udp: no matching connection found");
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#if UIP_CONF_ICMP_DEST_UNREACH && !UIP_CONF_IPV6
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/* Copy fields from packet header into payload of this ICMP packet. */
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memcpy(&(ICMPBUF->payload[0]), ICMPBUF, UIP_IPH_LEN + 8);
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/* Set the ICMP type and code. */
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ICMPBUF->type = ICMP_DEST_UNREACHABLE;
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ICMPBUF->icode = ICMP_PORT_UNREACHABLE;
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/* Calculate the ICMP checksum. */
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ICMPBUF->icmpchksum = 0;
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ICMPBUF->icmpchksum = ~uip_chksum((u16_t *)&(ICMPBUF->type), 36);
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/* Set the IP destination address to be the source address of the
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original packet. */
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uip_ipaddr_copy(&BUF->destipaddr, &BUF->srcipaddr);
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/* Set our IP address as the source address. */
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uip_ipaddr_copy(&BUF->srcipaddr, &uip_hostaddr);
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/* The size of the ICMP destination unreachable packet is 36 + the
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size of the IP header (20) = 56. */
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uip_len = 36 + UIP_IPH_LEN;
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ICMPBUF->len[0] = 0;
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ICMPBUF->len[1] = (u8_t)uip_len;
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ICMPBUF->ttl = UIP_TTL;
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ICMPBUF->proto = UIP_PROTO_ICMP;
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goto ip_send_nolen;
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#else /* UIP_CONF_ICMP_DEST_UNREACH */
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goto drop;
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goto drop;
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#endif /* UIP_CONF_ICMP_DEST_UNREACH */
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udp_found:
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udp_found:
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uip_conn = NULL;
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uip_conn = NULL;
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@ -46,7 +46,7 @@
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*
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*
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* This file is part of the uIP TCP/IP stack.
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* This file is part of the uIP TCP/IP stack.
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*
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*
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* $Id: uip.h,v 1.13 2007/11/28 12:52:12 adamdunkels Exp $
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* $Id: uip.h,v 1.14 2008/01/24 23:08:58 adamdunkels Exp $
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*
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*
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*/
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*/
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@ -1497,6 +1497,7 @@ struct uip_icmpip_hdr {
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u16_t icmpchksum;
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u16_t icmpchksum;
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#if !UIP_CONF_IPV6
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#if !UIP_CONF_IPV6
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u16_t id, seqno;
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u16_t id, seqno;
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u8_t payload[1];
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#else /* !UIP_CONF_IPV6 */
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#else /* !UIP_CONF_IPV6 */
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u8_t flags, reserved1, reserved2, reserved3;
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u8_t flags, reserved1, reserved2, reserved3;
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u8_t icmp6data[16];
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u8_t icmp6data[16];
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