/*
* Send NDP Router Advertisement
*/
void ndp_send_ra(Slirp *slirp)
{
DEBUG_CALL("ndp_send_ra");
/* Build IPv6 packet */
struct mbuf *t = m_get(slirp);
struct ip6 *rip = mtod(t, struct ip6 *);
rip->ip_src = (struct in6_addr)LINKLOCAL_ADDR;
rip->ip_dst = (struct in6_addr)ALLNODES_MULTICAST;
rip->ip_nh = IPPROTO_ICMPV6;
rip->ip_pl = htons(ICMP6_NDP_RA_MINLEN
+ NDPOPT_LINKLAYER_LEN
+ NDPOPT_PREFIXINFO_LEN);
t->m_len = sizeof(struct ip6) + ntohs(rip->ip_pl);
/* Build ICMPv6 packet */
t->m_data += sizeof(struct ip6);
struct icmp6 *ricmp = mtod(t, struct icmp6 *);
ricmp->icmp6_type = ICMP6_NDP_RA;
ricmp->icmp6_code = 0;
ricmp->icmp6_cksum = 0;
/* NDP */
ricmp->icmp6_nra.chl = NDP_AdvCurHopLimit;
ricmp->icmp6_nra.M = NDP_AdvManagedFlag;
ricmp->icmp6_nra.O = NDP_AdvOtherConfigFlag;
ricmp->icmp6_nra.reserved = 0;
ricmp->icmp6_nra.lifetime = htons(NDP_AdvDefaultLifetime);
ricmp->icmp6_nra.reach_time = htonl(NDP_AdvReachableTime);
ricmp->icmp6_nra.retrans_time = htonl(NDP_AdvRetransTime);
/* Source link-layer address (NDP option) */
t->m_data += ICMP6_NDP_RA_MINLEN;
struct ndpopt *opt = mtod(t, struct ndpopt *);
opt->ndpopt_type = NDPOPT_LINKLAYER_SOURCE;
opt->ndpopt_len = NDPOPT_LINKLAYER_LEN / 8;
in6_compute_ethaddr(rip->ip_src, opt->ndpopt_linklayer);
/* Prefix information (NDP option) */
t->m_data += NDPOPT_LINKLAYER_LEN;
struct ndpopt *opt2 = mtod(t, struct ndpopt *);
opt2->ndpopt_type = NDPOPT_PREFIX_INFO;
opt2->ndpopt_len = NDPOPT_PREFIXINFO_LEN / 8;
opt2->ndpopt_prefixinfo.prefix_length = slirp->vprefix_len;
opt2->ndpopt_prefixinfo.L = 1;
opt2->ndpopt_prefixinfo.A = 1;
opt2->ndpopt_prefixinfo.reserved1 = 0;
opt2->ndpopt_prefixinfo.valid_lt = htonl(NDP_AdvValidLifetime);
opt2->ndpopt_prefixinfo.pref_lt = htonl(NDP_AdvPrefLifetime);
opt2->ndpopt_prefixinfo.reserved2 = 0;
opt2->ndpopt_prefixinfo.prefix = slirp->vprefix_addr6;
/* ICMPv6 Checksum */
t->m_data -= NDPOPT_LINKLAYER_LEN;
t->m_data -= ICMP6_NDP_RA_MINLEN;
t->m_data -= sizeof(struct ip6);
ricmp->icmp6_cksum = ip6_cksum(t);
ip6_output(NULL, t, 0);
}
/*
* Send NDP Neighbor Advertisement
*/
static void ndp_send_na(Slirp *slirp, struct ip6 *ip, struct icmp6 *icmp)
{
/* Build IPv6 packet */
struct mbuf *t = m_get(slirp);
struct ip6 *rip = mtod(t, struct ip6 *);
rip->ip_src = icmp->icmp6_nns.target;
if (IN6_IS_ADDR_UNSPECIFIED(&ip->ip_src)) {
rip->ip_dst = (struct in6_addr)ALLNODES_MULTICAST;
} else {
rip->ip_dst = ip->ip_src;
}
rip->ip_nh = IPPROTO_ICMPV6;
rip->ip_pl = htons(ICMP6_NDP_NA_MINLEN
+ NDPOPT_LINKLAYER_LEN);
t->m_len = sizeof(struct ip6) + ntohs(rip->ip_pl);
/* Build ICMPv6 packet */
t->m_data += sizeof(struct ip6);
struct icmp6 *ricmp = mtod(t, struct icmp6 *);
ricmp->icmp6_type = ICMP6_NDP_NA;
ricmp->icmp6_code = 0;
ricmp->icmp6_cksum = 0;
/* NDP */
ricmp->icmp6_nna.R = NDP_IsRouter;
ricmp->icmp6_nna.S = !IN6_IS_ADDR_MULTICAST(&rip->ip_dst);
ricmp->icmp6_nna.O = 1;
ricmp->icmp6_nna.reserved_hi = 0;
ricmp->icmp6_nna.reserved_lo = 0;
ricmp->icmp6_nna.target = icmp->icmp6_nns.target;
/* Build NDP option */
t->m_data += ICMP6_NDP_NA_MINLEN;
struct ndpopt *opt = mtod(t, struct ndpopt *);
opt->ndpopt_type = NDPOPT_LINKLAYER_TARGET;
opt->ndpopt_len = NDPOPT_LINKLAYER_LEN / 8;
in6_compute_ethaddr(ricmp->icmp6_nna.target,
opt->ndpopt_linklayer);
/* ICMPv6 Checksum */
t->m_data -= ICMP6_NDP_NA_MINLEN;
t->m_data -= sizeof(struct ip6);
ricmp->icmp6_cksum = ip6_cksum(t);
ip6_output(NULL, t, 0);
}
/*
* Send NDP Neighbor Solitication
*/
void ndp_send_ns(Slirp *slirp, struct in6_addr addr)
{
DEBUG_CALL("ndp_send_ns");
#if !defined(_WIN32) || (_WIN32_WINNT >= 0x0600)
char addrstr[INET6_ADDRSTRLEN];
inet_ntop(AF_INET6, &addr, addrstr, INET6_ADDRSTRLEN);
DEBUG_ARG("target = %s", addrstr);
#endif
/* Build IPv6 packet */
struct mbuf *t = m_get(slirp);
struct ip6 *rip = mtod(t, struct ip6 *);
rip->ip_src = slirp->vhost_addr6;
rip->ip_dst = (struct in6_addr)SOLICITED_NODE_PREFIX;
memcpy(&rip->ip_dst.s6_addr[13], &addr.s6_addr[13], 3);
rip->ip_nh = IPPROTO_ICMPV6;
rip->ip_pl = htons(ICMP6_NDP_NS_MINLEN + NDPOPT_LINKLAYER_LEN);
t->m_len = sizeof(struct ip6) + ntohs(rip->ip_pl);
/* Build ICMPv6 packet */
t->m_data += sizeof(struct ip6);
struct icmp6 *ricmp = mtod(t, struct icmp6 *);
ricmp->icmp6_type = ICMP6_NDP_NS;
ricmp->icmp6_code = 0;
ricmp->icmp6_cksum = 0;
/* NDP */
ricmp->icmp6_nns.reserved = 0;
ricmp->icmp6_nns.target = addr;
/* Build NDP option */
t->m_data += ICMP6_NDP_NS_MINLEN;
struct ndpopt *opt = mtod(t, struct ndpopt *);
opt->ndpopt_type = NDPOPT_LINKLAYER_SOURCE;
opt->ndpopt_len = NDPOPT_LINKLAYER_LEN / 8;
in6_compute_ethaddr(slirp->vhost_addr6, opt->ndpopt_linklayer);
/* ICMPv6 Checksum */
t->m_data -= ICMP6_NDP_NA_MINLEN;
t->m_data -= sizeof(struct ip6);
ricmp->icmp6_cksum = ip6_cksum(t);
ip6_output(NULL, t, 1);
}
/*
* Send NDP Router Advertisement
*/
void ndp_send_ra(Slirp *slirp)
{
DEBUG_CALL("ndp_send_ra");
/* Build IPv6 packet */
struct mbuf *t = m_get(slirp);
struct ip6 *rip = mtod(t, struct ip6 *);
size_t pl_size = 0;
struct in6_addr addr;
uint32_t scope_id;
rip->ip_src = (struct in6_addr)LINKLOCAL_ADDR;
rip->ip_dst = (struct in6_addr)ALLNODES_MULTICAST;
rip->ip_nh = IPPROTO_ICMPV6;
/* Build ICMPv6 packet */
t->m_data += sizeof(struct ip6);
struct icmp6 *ricmp = mtod(t, struct icmp6 *);
ricmp->icmp6_type = ICMP6_NDP_RA;
ricmp->icmp6_code = 0;
ricmp->icmp6_cksum = 0;
/* NDP */
ricmp->icmp6_nra.chl = NDP_AdvCurHopLimit;
ricmp->icmp6_nra.M = NDP_AdvManagedFlag;
ricmp->icmp6_nra.O = NDP_AdvOtherConfigFlag;
ricmp->icmp6_nra.reserved = 0;
ricmp->icmp6_nra.lifetime = htons(NDP_AdvDefaultLifetime);
ricmp->icmp6_nra.reach_time = htonl(NDP_AdvReachableTime);
ricmp->icmp6_nra.retrans_time = htonl(NDP_AdvRetransTime);
t->m_data += ICMP6_NDP_RA_MINLEN;
pl_size += ICMP6_NDP_RA_MINLEN;
/* Source link-layer address (NDP option) */
struct ndpopt *opt = mtod(t, struct ndpopt *);
opt->ndpopt_type = NDPOPT_LINKLAYER_SOURCE;
opt->ndpopt_len = NDPOPT_LINKLAYER_LEN / 8;
in6_compute_ethaddr(rip->ip_src, opt->ndpopt_linklayer);
t->m_data += NDPOPT_LINKLAYER_LEN;
pl_size += NDPOPT_LINKLAYER_LEN;
/* Prefix information (NDP option) */
struct ndpopt *opt2 = mtod(t, struct ndpopt *);
opt2->ndpopt_type = NDPOPT_PREFIX_INFO;
opt2->ndpopt_len = NDPOPT_PREFIXINFO_LEN / 8;
opt2->ndpopt_prefixinfo.prefix_length = slirp->vprefix_len;
opt2->ndpopt_prefixinfo.L = 1;
opt2->ndpopt_prefixinfo.A = 1;
opt2->ndpopt_prefixinfo.reserved1 = 0;
opt2->ndpopt_prefixinfo.valid_lt = htonl(NDP_AdvValidLifetime);
opt2->ndpopt_prefixinfo.pref_lt = htonl(NDP_AdvPrefLifetime);
opt2->ndpopt_prefixinfo.reserved2 = 0;
opt2->ndpopt_prefixinfo.prefix = slirp->vprefix_addr6;
t->m_data += NDPOPT_PREFIXINFO_LEN;
pl_size += NDPOPT_PREFIXINFO_LEN;
/* Prefix information (NDP option) */
if (get_dns6_addr(&addr, &scope_id) >= 0) {
/* Host system does have an IPv6 DNS server, announce our proxy. */
struct ndpopt *opt3 = mtod(t, struct ndpopt *);
opt3->ndpopt_type = NDPOPT_RDNSS;
opt3->ndpopt_len = NDPOPT_RDNSS_LEN / 8;
opt3->ndpopt_rdnss.reserved = 0;
opt3->ndpopt_rdnss.lifetime = htonl(2 * NDP_MaxRtrAdvInterval);
opt3->ndpopt_rdnss.addr = slirp->vnameserver_addr6;
t->m_data += NDPOPT_RDNSS_LEN;
pl_size += NDPOPT_RDNSS_LEN;
}
rip->ip_pl = htons(pl_size);
t->m_data -= sizeof(struct ip6) + pl_size;
t->m_len = sizeof(struct ip6) + pl_size;
/* ICMPv6 Checksum */
ricmp->icmp6_cksum = ip6_cksum(t);
ip6_output(NULL, t, 0);
}
