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https://opencores.org/ocsvn/openrisc_2011-10-31/openrisc_2011-10-31/trunk
Subversion Repositories openrisc_2011-10-31
[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Demo/] [Common/] [ethernet/] [lwIP/] [core/] [ipv4/] [icmp.c] - Rev 622
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/* * Copyright (c) 2001-2004 Swedish Institute of Computer Science. * All rights reserved. * * Redistribution and use in source and binary forms, with or without modification, * are permitted provided that the following conditions are met: * * 1. Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY * OF SUCH DAMAGE. * * This file is part of the lwIP TCP/IP stack. * * Author: Adam Dunkels <adam@sics.se> * */ /* Some ICMP messages should be passed to the transport protocols. This is not implemented. */ #include <string.h> #include "lwip/opt.h" #include "lwip/icmp.h" #include "lwip/inet.h" #include "lwip/ip.h" #include "lwip/def.h" #include "lwip/stats.h" #include "lwip/snmp.h" void icmp_input(struct pbuf *p, struct netif *inp) { u8_t type; u8_t code; struct icmp_echo_hdr *iecho; struct ip_hdr *iphdr; struct ip_addr tmpaddr; u16_t hlen; ICMP_STATS_INC(icmp.recv); snmp_inc_icmpinmsgs(); iphdr = p->payload; hlen = IPH_HL(iphdr) * 4; if (pbuf_header(p, -((s16_t)hlen)) || (p->tot_len < sizeof(u16_t)*2)) { LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: short ICMP (%"U16_F" bytes) received\n", p->tot_len)); pbuf_free(p); ICMP_STATS_INC(icmp.lenerr); snmp_inc_icmpinerrors(); return; } type = *((u8_t *)p->payload); code = *(((u8_t *)p->payload)+1); switch (type) { case ICMP_ECHO: /* broadcast or multicast destination address? */ if (ip_addr_isbroadcast(&iphdr->dest, inp) || ip_addr_ismulticast(&iphdr->dest)) { LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: Not echoing to multicast or broadcast pings\n")); ICMP_STATS_INC(icmp.err); pbuf_free(p); return; } LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: ping\n")); if (p->tot_len < sizeof(struct icmp_echo_hdr)) { LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: bad ICMP echo received\n")); pbuf_free(p); ICMP_STATS_INC(icmp.lenerr); snmp_inc_icmpinerrors(); return; } iecho = p->payload; if (inet_chksum_pbuf(p) != 0) { LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: checksum failed for received ICMP echo\n")); pbuf_free(p); ICMP_STATS_INC(icmp.chkerr); snmp_inc_icmpinerrors(); return; } tmpaddr.addr = iphdr->src.addr; iphdr->src.addr = iphdr->dest.addr; iphdr->dest.addr = tmpaddr.addr; ICMPH_TYPE_SET(iecho, ICMP_ER); /* adjust the checksum */ if (iecho->chksum >= htons(0xffff - (ICMP_ECHO << 8))) { iecho->chksum += htons(ICMP_ECHO << 8) + 1; } else { iecho->chksum += htons(ICMP_ECHO << 8); } ICMP_STATS_INC(icmp.xmit); /* increase number of messages attempted to send */ snmp_inc_icmpoutmsgs(); /* increase number of echo replies attempted to send */ snmp_inc_icmpoutechoreps(); pbuf_header(p, hlen); ip_output_if(p, &(iphdr->src), IP_HDRINCL, IPH_TTL(iphdr), 0, IP_PROTO_ICMP, inp); break; default: LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: ICMP type %"S16_F" code %"S16_F" not supported.\n", (s16_t)type, (s16_t)code)); ICMP_STATS_INC(icmp.proterr); ICMP_STATS_INC(icmp.drop); } pbuf_free(p); } void icmp_dest_unreach(struct pbuf *p, enum icmp_dur_type t) { struct pbuf *q; struct ip_hdr *iphdr; struct icmp_dur_hdr *idur; q = pbuf_alloc(PBUF_IP, 8 + IP_HLEN + 8, PBUF_RAM); /* ICMP header + IP header + 8 bytes of data */ iphdr = p->payload; idur = q->payload; ICMPH_TYPE_SET(idur, ICMP_DUR); ICMPH_CODE_SET(idur, t); memcpy((u8_t *)q->payload + 8, p->payload, IP_HLEN + 8); /* calculate checksum */ idur->chksum = 0; idur->chksum = inet_chksum(idur, q->len); ICMP_STATS_INC(icmp.xmit); /* increase number of messages attempted to send */ snmp_inc_icmpoutmsgs(); /* increase number of destination unreachable messages attempted to send */ snmp_inc_icmpoutdestunreachs(); ip_output(q, NULL, &(iphdr->src), ICMP_TTL, 0, IP_PROTO_ICMP); pbuf_free(q); } #if IP_FORWARD void icmp_time_exceeded(struct pbuf *p, enum icmp_te_type t) { struct pbuf *q; struct ip_hdr *iphdr; struct icmp_te_hdr *tehdr; q = pbuf_alloc(PBUF_IP, 8 + IP_HLEN + 8, PBUF_RAM); iphdr = p->payload; LWIP_DEBUGF(ICMP_DEBUG, ("icmp_time_exceeded from ")); ip_addr_debug_print(ICMP_DEBUG, &(iphdr->src)); LWIP_DEBUGF(ICMP_DEBUG, (" to ")); ip_addr_debug_print(ICMP_DEBUG, &(iphdr->dest)); LWIP_DEBUGF(ICMP_DEBUG, ("\n")); tehdr = q->payload; ICMPH_TYPE_SET(tehdr, ICMP_TE); ICMPH_CODE_SET(tehdr, t); /* copy fields from original packet */ memcpy((u8_t *)q->payload + 8, (u8_t *)p->payload, IP_HLEN + 8); /* calculate checksum */ tehdr->chksum = 0; tehdr->chksum = inet_chksum(tehdr, q->len); ICMP_STATS_INC(icmp.xmit); /* increase number of messages attempted to send */ snmp_inc_icmpoutmsgs(); /* increase number of destination unreachable messages attempted to send */ snmp_inc_icmpouttimeexcds(); ip_output(q, NULL, &(iphdr->src), ICMP_TTL, 0, IP_PROTO_ICMP); pbuf_free(q); } #endif /* IP_FORWARD */
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