riot-ci/RIOT
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

gnrc_ipv6: assume no preparsed packets

Browse Source
This commit is contained in:
Martine Lenders 2018-10-23 21:53:30 +02:00 committed by Martine Lenders
parent 9bb458dac1
commit 4befe0b5e2
1 changed files with 28 additions and 60 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

88
sys/net/gnrc/network_layer/ipv6/gnrc_ipv6.c
View File

@ -717,7 +717,7 @@ static inline bool _pkt_not_for_me(gnrc_netif_t **netif, ipv6_hdr_t *hdr)
static void _receive(gnrc_pktsnip_t *pkt)
{
gnrc_netif_t *netif = NULL;
gnrc_pktsnip_t *ipv6, *netif_hdr, *first_ext;
gnrc_pktsnip_t *ipv6, *netif_hdr;
ipv6_hdr_t *hdr;
assert(pkt != NULL);
@ -734,64 +734,14 @@ static void _receive(gnrc_pktsnip_t *pkt)
#endif
}
first_ext = pkt;
for (ipv6 = pkt; ipv6 != NULL; ipv6 = ipv6->next) { /* find IPv6 header if already marked */
if ((ipv6->type == GNRC_NETTYPE_IPV6) && (ipv6->size == sizeof(ipv6_hdr_t)) &&
(ipv6->data != NULL) && (ipv6_hdr_is(ipv6->data))) {
break;
}
first_ext = ipv6;
}
if (ipv6 == NULL) {
if ((pkt->data == NULL) || !ipv6_hdr_is(pkt->data)) {
DEBUG("ipv6: Received packet was not IPv6, dropping packet\n");
gnrc_pktbuf_release(pkt);
return;
}
#ifdef MODULE_GNRC_IPV6_WHITELIST
if (!gnrc_ipv6_whitelisted(&((ipv6_hdr_t *)(pkt->data))->src)) {
DEBUG("ipv6: Source address not whitelisted, dropping packet\n");
gnrc_icmpv6_error_dst_unr_send(ICMPV6_ERROR_DST_UNR_PROHIB, pkt);
gnrc_pktbuf_release(pkt);
return;
}
#endif
#ifdef MODULE_GNRC_IPV6_BLACKLIST
if (gnrc_ipv6_blacklisted(&((ipv6_hdr_t *)(pkt->data))->src)) {
DEBUG("ipv6: Source address blacklisted, dropping packet\n");
gnrc_icmpv6_error_dst_unr_send(ICMPV6_ERROR_DST_UNR_PROHIB, pkt);
gnrc_pktbuf_release(pkt);
return;
}
#endif
/* seize ipv6 as a temporary variable */
ipv6 = gnrc_pktbuf_start_write(pkt);
if (ipv6 == NULL) {
DEBUG("ipv6: unable to get write access to packet, drop it\n");
gnrc_pktbuf_release(pkt);
return;
}
pkt = ipv6; /* reset pkt from temporary variable */
ipv6 = gnrc_pktbuf_mark(pkt, sizeof(ipv6_hdr_t), GNRC_NETTYPE_IPV6);
first_ext = pkt;
pkt->type = GNRC_NETTYPE_UNDEF; /* snip is no longer IPv6 */
if (ipv6 == NULL) {
DEBUG("ipv6: error marking IPv6 header, dropping packet\n");
gnrc_pktbuf_release(pkt);
return;
}
if ((pkt->data == NULL) || (pkt->size < sizeof(ipv6_hdr_t)) ||
!ipv6_hdr_is(pkt->data)) {
DEBUG("ipv6: Received packet was not IPv6, dropping packet\n");
gnrc_pktbuf_release(pkt);
return;
}
#ifdef MODULE_GNRC_IPV6_WHITELIST
else if (!gnrc_ipv6_whitelisted(&((ipv6_hdr_t *)(ipv6->data))->src)) {
/* if ipv6 header already marked*/
else if (!gnrc_ipv6_whitelisted(&((ipv6_hdr_t *)(pkt->data))->src)) {
DEBUG("ipv6: Source address not whitelisted, dropping packet\n");
gnrc_icmpv6_error_dst_unr_send(ICMPV6_ERROR_DST_UNR_PROHIB, pkt);
gnrc_pktbuf_release(pkt);
@ -799,15 +749,33 @@ static void _receive(gnrc_pktsnip_t *pkt)
}
#endif
#ifdef MODULE_GNRC_IPV6_BLACKLIST
else if (gnrc_ipv6_blacklisted(&((ipv6_hdr_t *)(ipv6->data))->src)) {
/* if ipv6 header already marked*/
else if (gnrc_ipv6_blacklisted(&((ipv6_hdr_t *)(pkt->data))->src)) {
DEBUG("ipv6: Source address blacklisted, dropping packet\n");
gnrc_icmpv6_error_dst_unr_send(ICMPV6_ERROR_DST_UNR_PROHIB, pkt);
gnrc_pktbuf_release(pkt);
return;
}
#endif
/* seize ipv6 as a temporary variable */
ipv6 = gnrc_pktbuf_start_write(pkt);
if (ipv6 == NULL) {
DEBUG("ipv6: unable to get write access to packet, drop it\n");
gnrc_pktbuf_release(pkt);
return;
}
pkt = ipv6; /* reset pkt from temporary variable */
ipv6 = gnrc_pktbuf_mark(pkt, sizeof(ipv6_hdr_t), GNRC_NETTYPE_IPV6);
pkt->type = GNRC_NETTYPE_UNDEF; /* snip is no longer IPv6 */
if (ipv6 == NULL) {
DEBUG("ipv6: error marking IPv6 header, dropping packet\n");
gnrc_pktbuf_release(pkt);
return;
}
/* extract header */
hdr = (ipv6_hdr_t *)ipv6->data;
@ -909,7 +877,7 @@ static void _receive(gnrc_pktsnip_t *pkt)
}
/* IPv6 internal demuxing (ICMPv6, Extension headers etc.) */
gnrc_ipv6_demux(netif, first_ext, pkt, hdr->nh);
gnrc_ipv6_demux(netif, pkt, pkt, hdr->nh);
}
static void _decapsulate(gnrc_pktsnip_t *pkt)