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/*
* Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
*
* This file is subject to the terms and conditions of the GNU Lesser General
* Public License v2.1. See the file LICENSE in the top level directory for
* more details.
*/
/**
* @ingroup net_gnrc_icmpv6
* @{
*
* @file
*
* @author Martine Lenders <mlenders@inf.fu-berlin.de>
*/
#include <errno.h>
#include <inttypes.h>
#include <stdlib.h>
#include "byteorder.h"
#include "kernel_types.h"
#include "net/ipv6/hdr.h"
#include "net/gnrc.h"
#include "net/gnrc/ndp.h"
#include "net/protnum.h"
#include "od.h"
#include "utlist.h"
#include "net/gnrc/icmpv6.h"
#include "net/gnrc/icmpv6/echo.h"
#define ENABLE_DEBUG (0)
#include "debug.h"
static inline uint16_t _calc_csum(gnrc_pktsnip_t *hdr,
gnrc_pktsnip_t *pseudo_hdr,
gnrc_pktsnip_t *payload)
{
uint16_t csum = 0;
uint16_t len = (uint16_t)hdr->size;
while (payload && (payload != hdr)) {
csum = inet_csum_slice(csum, payload->data, payload->size, len);
len += (uint16_t)payload->size;
payload = payload->next;
}
csum = inet_csum(csum, hdr->data, hdr->size);
csum = ipv6_hdr_inet_csum(csum, pseudo_hdr->data, PROTNUM_ICMPV6, len);
return ~csum;
}
void gnrc_icmpv6_demux(kernel_pid_t iface, gnrc_pktsnip_t *pkt)
{
gnrc_pktsnip_t *icmpv6, *ipv6;
icmpv6_hdr_t *hdr;
icmpv6 = gnrc_pktsnip_search_type(pkt, GNRC_NETTYPE_ICMPV6);
assert(icmpv6 != NULL);
/* there can be extension headers between IPv6 and ICMPv6 header so we have
* to search it */
ipv6 = gnrc_pktsnip_search_type(icmpv6, GNRC_NETTYPE_IPV6);
assert(ipv6 != NULL);
if (icmpv6->size < sizeof(icmpv6_hdr_t)) {
DEBUG("icmpv6: packet too short.\n");
return;
}
/* Note: size will be checked again in gnrc_icmpv6_echo_req_handle,
gnrc_ndp_rtr_sol_handle, and others */
hdr = (icmpv6_hdr_t *)icmpv6->data;
if (_calc_csum(icmpv6, ipv6, pkt)) {
DEBUG("icmpv6: wrong checksum.\n");
/* don't release: IPv6 does this */
return;
}
switch (hdr->type) {
/* TODO: handle ICMPv6 errors */
#ifdef MODULE_GNRC_ICMPV6_ECHO
case ICMPV6_ECHO_REQ:
DEBUG("icmpv6: handle echo request.\n");
gnrc_icmpv6_echo_req_handle(iface, (ipv6_hdr_t *)ipv6->data,
(icmpv6_echo_t *)hdr, icmpv6->size);
break;
#endif
#if (defined(MODULE_GNRC_NDP_ROUTER) || defined(MODULE_GNRC_SIXLOWPAN_ND_ROUTER))
case ICMPV6_RTR_SOL:
DEBUG("icmpv6: router solicitation received\n");
gnrc_ndp_rtr_sol_handle(iface, pkt, ipv6->data, (ndp_rtr_sol_t *)hdr,
icmpv6->size);
break;
#endif
#ifdef MODULE_GNRC_NDP
case ICMPV6_RTR_ADV:
DEBUG("icmpv6: router advertisement received\n");
gnrc_ndp_rtr_adv_handle(iface, pkt, ipv6->data, (ndp_rtr_adv_t *)hdr,
icmpv6->size);
break;
case ICMPV6_NBR_SOL:
DEBUG("icmpv6: neighbor solicitation received\n");
gnrc_ndp_nbr_sol_handle(iface, pkt, ipv6->data, (ndp_nbr_sol_t *)hdr,
icmpv6->size);
break;
case ICMPV6_NBR_ADV:
DEBUG("icmpv6: neighbor advertisement received\n");
gnrc_ndp_nbr_adv_handle(iface, pkt, ipv6->data, (ndp_nbr_adv_t *)hdr,
icmpv6->size);
break;
#endif
case ICMPV6_REDIRECT:
DEBUG("icmpv6: redirect message received\n");
/* TODO */
break;
default:
DEBUG("icmpv6: unknown type field %u\n", hdr->type);
break;
}
/* ICMPv6-all will be send in gnrc_ipv6.c so only dispatch of subtypes is
* needed */
if (!gnrc_netapi_dispatch_receive(GNRC_NETTYPE_ICMPV6, hdr->type, pkt)) {
DEBUG("icmpv6: no one interested in type %d\n", hdr->type);
gnrc_pktbuf_release(pkt);
}
}
gnrc_pktsnip_t *gnrc_icmpv6_build(gnrc_pktsnip_t *next, uint8_t type, uint8_t code,
size_t size)
{
gnrc_pktsnip_t *pkt;
icmpv6_hdr_t *icmpv6;
pkt = gnrc_pktbuf_add(next, NULL, size, GNRC_NETTYPE_ICMPV6);
if (pkt == NULL) {
DEBUG("icmpv6_echo: no space left in packet buffer\n");
return NULL;
}
DEBUG("icmpv6: Building ICMPv6 message with type=%u, code=%u\n",
type, code);
icmpv6 = (icmpv6_hdr_t *)pkt->data;
icmpv6->type = type;
icmpv6->code = code;
icmpv6->csum.u16 = 0;
return pkt;
}
int gnrc_icmpv6_calc_csum(gnrc_pktsnip_t *hdr, gnrc_pktsnip_t *pseudo_hdr)
{
uint32_t csum = 0;
if (hdr == NULL) {
return -EFAULT;
}
if (hdr->type != GNRC_NETTYPE_ICMPV6) {
return -EBADMSG;
}
csum = _calc_csum(hdr, pseudo_hdr, hdr->next);
if (csum == 0) {
return -ENOENT;
}
((icmpv6_hdr_t *)hdr->data)->csum = byteorder_htons(csum);
return 0;
}
/**
* @}
*/
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