--- /dev/null
+/*
+ * 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 "lwip/opt.h"
+
+#if LWIP_ICMP /* don't build if not configured for use in lwipopts.h */
+
+#include "lwip/icmp.h"
+#include "lwip/inet.h"
+#include "lwip/ip.h"
+#include "lwip/def.h"
+#include "lwip/stats.h"
+
+void
+icmp_input(struct pbuf *p, struct netif *inp)
+{
+ u8_t type;
+ struct icmp_echo_hdr *iecho;
+ struct ip_hdr *iphdr;
+ struct ip_addr tmpaddr;
+
+ ICMP_STATS_INC(icmp.recv);
+
+ /* TODO: check length before accessing payload! */
+
+ type = ((u8_t *)p->payload)[0];
+
+ switch (type) {
+ case ICMP6_ECHO:
+ 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);
+ return;
+ }
+ iecho = p->payload;
+ iphdr = (struct ip_hdr *)((u8_t *)p->payload - IP_HLEN);
+ if (inet_chksum_pbuf(p) != 0) {
+ LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: checksum failed for received ICMP echo (%"X16_F")\n", inet_chksum_pseudo(p, &(iphdr->src), &(iphdr->dest), IP_PROTO_ICMP, p->tot_len)));
+ ICMP_STATS_INC(icmp.chkerr);
+ /* return;*/
+ }
+ LWIP_DEBUGF(ICMP_DEBUG, ("icmp: p->len %"S16_F" p->tot_len %"S16_F"\n", p->len, p->tot_len));
+ ip_addr_set(&tmpaddr, &(iphdr->src));
+ ip_addr_set(&(iphdr->src), &(iphdr->dest));
+ ip_addr_set(&(iphdr->dest), &tmpaddr);
+ iecho->type = ICMP6_ER;
+ /* adjust the checksum */
+ if (iecho->chksum >= htons(0xffff - (ICMP6_ECHO << 8))) {
+ iecho->chksum += htons(ICMP6_ECHO << 8) + 1;
+ } else {
+ iecho->chksum += htons(ICMP6_ECHO << 8);
+ }
+ LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: checksum failed for received ICMP echo (%"X16_F")\n", inet_chksum_pseudo(p, &(iphdr->src), &(iphdr->dest), IP_PROTO_ICMP, p->tot_len)));
+ ICMP_STATS_INC(icmp.xmit);
+
+ /* LWIP_DEBUGF("icmp: p->len %"U16_F" p->tot_len %"U16_F"\n", p->len, p->tot_len);*/
+ ip_output_if (p, &(iphdr->src), IP_HDRINCL,
+ iphdr->hoplim, IP_PROTO_ICMP, inp);
+ break;
+ default:
+ LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: ICMP type %"S16_F" not supported.\n", (s16_t)type));
+ 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;
+
+ /* @todo: can this be PBUF_LINK instead of PBUF_IP? */
+ q = pbuf_alloc(PBUF_IP, 8 + IP_HLEN + 8, PBUF_RAM);
+ /* ICMP header + IP header + 8 bytes of data */
+ if (q == NULL) {
+ LWIP_DEBUGF(ICMP_DEBUG, ("icmp_dest_unreach: failed to allocate pbuf for ICMP packet.\n"));
+ pbuf_free(p);
+ return;
+ }
+ LWIP_ASSERT("check that first pbuf can hold icmp message",
+ (q->len >= (8 + IP_HLEN + 8)));
+
+ iphdr = p->payload;
+
+ idur = q->payload;
+ idur->type = (u8_t)ICMP6_DUR;
+ idur->icode = (u8_t)t;
+
+ SMEMCPY((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);
+
+ ip_output(q, NULL,
+ (struct ip_addr *)&(iphdr->src), ICMP_TTL, IP_PROTO_ICMP);
+ pbuf_free(q);
+}
+
+void
+icmp_time_exceeded(struct pbuf *p, enum icmp_te_type t)
+{
+ struct pbuf *q;
+ struct ip_hdr *iphdr;
+ struct icmp_te_hdr *tehdr;
+
+ LWIP_DEBUGF(ICMP_DEBUG, ("icmp_time_exceeded\n"));
+
+ /* @todo: can this be PBUF_LINK instead of PBUF_IP? */
+ q = pbuf_alloc(PBUF_IP, 8 + IP_HLEN + 8, PBUF_RAM);
+ /* ICMP header + IP header + 8 bytes of data */
+ if (q == NULL) {
+ LWIP_DEBUGF(ICMP_DEBUG, ("icmp_dest_unreach: failed to allocate pbuf for ICMP packet.\n"));
+ pbuf_free(p);
+ return;
+ }
+ LWIP_ASSERT("check that first pbuf can hold icmp message",
+ (q->len >= (8 + IP_HLEN + 8)));
+
+ iphdr = p->payload;
+
+ tehdr = q->payload;
+ tehdr->type = (u8_t)ICMP6_TE;
+ tehdr->icode = (u8_t)t;
+
+ /* copy fields from original packet */
+ SMEMCPY((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);
+ ip_output(q, NULL,
+ (struct ip_addr *)&(iphdr->src), ICMP_TTL, IP_PROTO_ICMP);
+ pbuf_free(q);
+}
+
+#endif /* LWIP_ICMP */
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