static void checksum_ipv6_packet(struct packet *packet)
{
struct ipv6 *ipv6 = packet->ipv6;
/* IPv6 has no header checksum. */
/* For now we do not support IPv6 extension headers. */
assert(packet->ip_bytes >= sizeof(*ipv6) + ntohs(ipv6->payload_len));
/* Find the length of layer 4 header, options, and payload. */
const int l4_bytes = ntohs(ipv6->payload_len);
assert(l4_bytes > 0);
/* Fill in IPv6-based layer 4 checksum. */
if (packet->sctp != NULL) {
struct sctp_common_header *sctp = packet->sctp;
sctp->crc32c = 0;
sctp->crc32c = sctp_crc32c(sctp, l4_bytes);
} else if (packet->tcp != NULL) {
struct tcp *tcp = packet->tcp;
tcp->check = 0;
tcp->check = tcp_udp_v6_checksum(&ipv6->src_ip,
&ipv6->dst_ip,
IPPROTO_TCP, tcp, l4_bytes);
} else if (packet->udp != NULL) {
struct udp *udp = packet->udp;
udp->check = 0;
udp->check = tcp_udp_v6_checksum(&ipv6->src_ip,
&ipv6->dst_ip,
IPPROTO_UDP, udp, l4_bytes);
} else if (packet->udplite != NULL) {
struct udplite *udplite = packet->udplite;
u16 coverage;
coverage = ntohs(udplite->cov);
if ((coverage == 0) || (coverage > l4_bytes))
coverage = l4_bytes;
udplite->check = 0;
udplite->check = udplite_v6_checksum(&ipv6->src_ip,
&ipv6->dst_ip,
IPPROTO_UDPLITE,
udplite,
l4_bytes, coverage);
} else if (packet->icmpv6 != NULL) {
/* IPv6 ICMP has a pseudo-header checksum, like TCP. */
struct icmpv6 *icmpv6 = packet->icmpv6;
icmpv6->checksum = 0;
icmpv6->checksum =
tcp_udp_v6_checksum(&ipv6->src_ip,
&ipv6->dst_ip,
IPPROTO_ICMPV6, icmpv6, l4_bytes);
} else {
assert(!"not TCP or UDP or UDPLite or ICMP");
}
}
static void checksum_ipv6_packet(struct packet *packet)
{
struct ipv6 *ipv6 = packet->ipv6;
/* IPv6 has no header checksum. */
/* For now we do not support IPv6 extension headers. */
assert(packet->ip_bytes >= sizeof(*ipv6) + ntohs(ipv6->payload_len));
/* Find the length of layer 4 header, options, and payload. */
const int l4_bytes = ntohs(ipv6->payload_len);
assert(l4_bytes > 0);
/* Fill in IPv6-based layer 4 checksum. */
if (packet->tcp != NULL) {
struct tcp *tcp = packet->tcp;
tcp->check = 0;
tcp->check = tcp_udp_v6_checksum(&ipv6->src_ip,
&ipv6->dst_ip,
IPPROTO_TCP, tcp, l4_bytes);
} else if (packet->udp != NULL) {
struct udp *udp = packet->udp;
udp->check = 0;
udp->check = tcp_udp_v6_checksum(&ipv6->src_ip,
&ipv6->dst_ip,
IPPROTO_UDP, udp, l4_bytes);
} else if (packet->icmpv6 != NULL) {
/* IPv6 ICMP has a pseudo-header checksum, like TCP. */
struct icmpv6 *icmpv6 = packet->icmpv6;
icmpv6->checksum = 0;
icmpv6->checksum =
tcp_udp_v6_checksum(&ipv6->src_ip,
&ipv6->dst_ip,
IPPROTO_ICMPV6, icmpv6, l4_bytes);
} else {
assert(!"not TCP or ICMP");
}
}
