#include <stddef.h>
#include <resolv.h>
#include <sys/timerfd.h>
+#include <arpa/inet.h>
#include "odhcpd.h"
#include "dhcpv6.h"
}
// Configure multicast settings
- if (enable && iface->dhcpv6 && !iface->master) {
+ if (enable && iface->dhcpv6) {
int sock = socket(AF_INET6, SOCK_DGRAM | SOCK_CLOEXEC, IPPROTO_UDP);
if (sock < 0) {
syslog(LOG_ERR, "Failed to create DHCPv6 server socket: %s",
} refresh = {htons(DHCPV6_OPT_INFO_REFRESH), htons(sizeof(uint32_t)),
htonl(600)};
- struct odhcpd_ipaddr ipaddr;
- struct in6_addr *dns_addr = iface->dns;
+ struct in6_addr dns_addr, *dns_addr_ptr = iface->dns;
size_t dns_cnt = iface->dns_cnt;
- if (dns_cnt == 0 && odhcpd_get_interface_addresses(iface->ifindex, &ipaddr, 1) == 1) {
- dns_addr = &ipaddr.addr;
+ if ((dns_cnt == 0) &&
+ !odhcpd_get_interface_dns_addr(iface, &dns_addr)) {
+ dns_addr_ptr = &dns_addr;
dns_cnt = 1;
}
struct {
uint16_t type;
uint16_t len;
- } dns = {htons(DHCPV6_OPT_DNS_SERVERS), htons(dns_cnt * sizeof(*dns_addr))};
+ } dns = {htons(DHCPV6_OPT_DNS_SERVERS), htons(dns_cnt * sizeof(*dns_addr_ptr))};
[IOV_DEST] = {&dest, (uint8_t*)&dest.clientid_type - (uint8_t*)&dest},
[IOV_MAXRT] = {&maxrt, sizeof(maxrt)},
[IOV_DNS] = {&dns, (dns_cnt) ? sizeof(dns) : 0},
- [IOV_DNS_ADDR] = {dns_addr, dns_cnt * sizeof(*dns_addr)},
+ [IOV_DNS_ADDR] = {dns_addr_ptr, dns_cnt * sizeof(*dns_addr_ptr)},
[IOV_SEARCH] = {&search, (search_len) ? sizeof(search) : 0},
[IOV_SEARCH_DOMAIN] = {search_domain, search_len},
[IOV_PDBUF] = {pdbuf, 0},
} else if (opts[-4] == DHCPV6_MSG_INFORMATION_REQUEST) {
iov[IOV_REFRESH].iov_base = &refresh;
iov[IOV_REFRESH].iov_len = sizeof(refresh);
+
+ // Return inf max rt option in reply to information request
+ maxrt.type = htons(DHCPV6_OPT_INF_MAX_RT);
}
// Go through options and find what we need
iov[IOV_CERID].iov_len = sizeof(cerid);
if (IN6_IS_ADDR_UNSPECIFIED(&cerid.addr)) {
- struct odhcpd_ipaddr addrs[32];
- ssize_t len = odhcpd_get_interface_addresses(0, addrs,
- sizeof(addrs) / sizeof(*addrs));
+ struct odhcpd_ipaddr *addrs;
+ ssize_t len = odhcpd_get_interface_addresses(0, true, &addrs);
for (ssize_t i = 0; i < len; ++i)
if (IN6_IS_ADDR_UNSPECIFIED(&cerid.addr)
|| memcmp(&addrs[i].addr, &cerid.addr, sizeof(cerid.addr)) < 0)
cerid.addr = addrs[i].addr;
+
+ free(addrs);
}
#endif
}
if (is_authenticated)
return; // Impossible to rewrite
- struct odhcpd_ipaddr ip;
const struct in6_addr *rewrite = iface->dns;
+ struct in6_addr addr;
size_t rewrite_cnt = iface->dns_cnt;
if (rewrite_cnt == 0) {
- if (odhcpd_get_interface_addresses(iface->ifindex, &ip, 1) < 1)
+ if (odhcpd_get_interface_dns_addr(iface, &addr))
return; // Unable to get interface address
- rewrite = &ip.addr;
+ rewrite = &addr;
rewrite_cnt = 1;
}
odhcpd_send(iface->dhcpv6_event.uloop.fd, &target, &iov, 1, iface);
}
+static struct odhcpd_ipaddr *relay_link_address(struct interface *iface)
+{
+ struct odhcpd_ipaddr *addr = NULL;
+ time_t now = odhcpd_time();
+
+ for (size_t i = 0; i < iface->ia_addr_len; i++) {
+ if (iface->ia_addr[i].valid <= (uint32_t)now)
+ continue;
+
+ if (iface->ia_addr[i].preferred > (uint32_t)now) {
+ addr = &iface->ia_addr[i];
+ break;
+ }
+
+ if (!addr || (iface->ia_addr[i].valid > addr->valid))
+ addr = &iface->ia_addr[i];
+ }
+
+ return addr;
+}
// Relay client request (regular DHCPv6-relay)
static void relay_client_request(struct sockaddr_in6 *source,
memcpy(&hdr.interface_id_data, &ifindex, sizeof(ifindex));
// Detect public IP of slave interface to use as link-address
- struct odhcpd_ipaddr ip;
- if (odhcpd_get_interface_addresses(iface->ifindex, &ip, 1) < 1) {
+ struct odhcpd_ipaddr *ip = relay_link_address(iface);
+ if (!ip) {
// No suitable address! Is the slave not configured yet?
// Detect public IP of master interface and use it instead
// This is WRONG and probably violates the RFC. However
// otherwise we have a hen and egg problem because the
// slave-interface cannot be auto-configured.
- if (odhcpd_get_interface_addresses(master->ifindex, &ip, 1) < 1)
+ ip = relay_link_address(master);
+ if (!ip)
return; // Could not obtain a suitable address
}
- memcpy(&hdr.link_address, &ip.addr, sizeof(hdr.link_address));
+
+ memcpy(&hdr.link_address, &ip->addr.in6, sizeof(hdr.link_address));
struct sockaddr_in6 dhcpv6_servers = {AF_INET6,
htons(DHCPV6_SERVER_PORT), 0, ALL_DHCPV6_SERVERS, 0};
struct iovec iov[2] = {{&hdr, sizeof(hdr)}, {(void*)data, len}};
- odhcpd_send(iface->dhcpv6_event.uloop.fd, &dhcpv6_servers, iov, 2, master);
+ odhcpd_send(master->dhcpv6_event.uloop.fd, &dhcpv6_servers, iov, 2, master);
}