/*
* Translate addr in host addr when it is a virtual address
*/
void sotranslate_out(struct socket *so, struct sockaddr_storage *addr)
{
Slirp *slirp = so->slirp;
struct sockaddr_in *sin = (struct sockaddr_in *)addr;
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)addr;
switch (addr->ss_family) {
case AF_INET:
if ((so->so_faddr.s_addr & slirp->vnetwork_mask.s_addr) ==
slirp->vnetwork_addr.s_addr) {
/* It's an alias */
if (so->so_faddr.s_addr == slirp->vnameserver_addr.s_addr) {
if (get_dns_addr(&sin->sin_addr) < 0) {
sin->sin_addr = loopback_addr;
}
} else {
sin->sin_addr = loopback_addr;
}
}
DEBUG_MISC((dfd, " addr.sin_port=%d, "
"addr.sin_addr.s_addr=%.16s\n",
ntohs(sin->sin_port), inet_ntoa(sin->sin_addr)));
break;
case AF_INET6:
if (in6_equal_net(&so->so_faddr6, &slirp->vprefix_addr6,
slirp->vprefix_len)) {
if (in6_equal(&so->so_faddr6, &slirp->vnameserver_addr6)) {
uint32_t scope_id;
if (get_dns6_addr(&sin6->sin6_addr, &scope_id) >= 0) {
sin6->sin6_scope_id = scope_id;
} else {
sin6->sin6_addr = in6addr_loopback;
}
} else {
sin6->sin6_addr = in6addr_loopback;
}
}
break;
default:
break;
}
}
/*
* 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);
}