#include <sys/time.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
+#include <arpa/inet.h>
#include <netinet/in.h>
#include <net/if.h>
static int request_prefix = -1;
static enum odhcp6c_ia_mode na_mode = IA_MODE_NONE, pd_mode = IA_MODE_NONE;
static bool accept_reconfig = false;
+// Server unicast address
+static struct in6_addr server_addr = IN6ADDR_ANY_INIT;
// Reconfigure key
static uint8_t reconf_key[16];
sizeof(ifr.ifr_name));
if (ioctl(sock, SIOCGIFHWADDR, &ifr) < 0)
continue;
+
memcpy(&duid[8], ifr.ifr_hwaddr.sa_data,
ETHER_ADDR_LEN);
}
htons(DHCPV6_OPT_SIP_SERVER_A),
htons(DHCPV6_OPT_DNS_SERVERS),
htons(DHCPV6_OPT_DNS_DOMAIN),
+ htons(DHCPV6_OPT_UNICAST),
htons(DHCPV6_OPT_NTP_SERVER),
htons(DHCPV6_OPT_AFTR_NAME),
htons(DHCPV6_OPT_PD_EXCLUDE),
};
odhcp6c_add_state(STATE_ORO, oro, sizeof(oro));
- do {
- // Configure IPv6-options
- int val = 1;
- if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &val, sizeof(val)) < 0)
- break;
- if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val)) < 0)
- break;
- if (setsockopt(sock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &val, sizeof(val)) < 0)
- break;
-
- val = 0;
- if (setsockopt(sock, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &val, sizeof(val)) < 0)
- break;
- if (setsockopt(sock, SOL_SOCKET, SO_BINDTODEVICE, ifname, strlen(ifname)) < 0)
- break;
-
- struct sockaddr_in6 client_addr = { .sin6_family = AF_INET6,
- .sin6_port = htons(DHCPV6_CLIENT_PORT), .sin6_flowinfo = 0 };
- if (bind(sock, (struct sockaddr*)&client_addr, sizeof(client_addr)) < 0)
- break;
-
- return 0;
- } while (0);
+ // Configure IPv6-options
+ int val = 1;
+ setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &val, sizeof(val));
+ setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
+ setsockopt(sock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &val, sizeof(val));
+ val = 0;
+ setsockopt(sock, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &val, sizeof(val));
+ setsockopt(sock, SOL_SOCKET, SO_BINDTODEVICE, ifname, strlen(ifname));
+
+ struct sockaddr_in6 client_addr = { .sin6_family = AF_INET6,
+ .sin6_port = htons(DHCPV6_CLIENT_PORT), .sin6_flowinfo = 0 };
+ if (bind(sock, (struct sockaddr*)&client_addr, sizeof(client_addr)) < 0)
+ return -1;
- return -1;
+ return 0;
}
0, ALL_DHCPV6_RELAYS, ifindex};
struct msghdr msg = {&srv, sizeof(srv), iov, cnt, NULL, 0, 0};
- sendmsg(sock, &msg, 0);
+ switch (type) {
+ case DHCPV6_MSG_REQUEST:
+ case DHCPV6_MSG_RENEW:
+ case DHCPV6_MSG_RELEASE:
+ case DHCPV6_MSG_DECLINE:
+ if (!IN6_IS_ADDR_UNSPECIFIED(&server_addr) &&
+ odhcp6c_addr_in_scope(&server_addr)) {
+ srv.sin6_addr = server_addr;
+ if (!IN6_IS_ADDR_LINKLOCAL(&server_addr))
+ srv.sin6_scope_id = 0;
+ }
+ break;
+ default:
+ break;
+ }
+
+ if (sendmsg(sock, &msg, 0) < 0) {
+ char in6_str[INET6_ADDRSTRLEN];
+
+ syslog(LOG_ERR, "Failed to send DHCPV6 message to %s (%s)",
+ inet_ntop(AF_INET6, (const void *)&srv.sin6_addr,
+ in6_str, sizeof(in6_str)), strerror(errno));
+ }
}
}
// Receive rounds
- for (; len < 0 && round_start < round_end;
+ for (; len < 0 && (round_start < round_end);
round_start = odhcp6c_get_milli_time()) {
uint8_t buf[1536], cmsg_buf[CMSG_SPACE(sizeof(struct in6_pktinfo))];
struct iovec iov = {buf, sizeof(buf)};
{
uint16_t olen, otype;
uint8_t *odata, pref = 0;
- struct dhcpv6_server_cand cand = {false, false, 0, 0, {0}, NULL, NULL, 0, 0};
+ struct dhcpv6_server_cand cand = {false, false, 0, 0, {0},
+ IN6ADDR_ANY_INIT, NULL, NULL, 0, 0};
bool have_na = false;
int have_pd = 0;
} else if (otype == DHCPV6_OPT_PREF && olen >= 1 &&
cand.preference >= 0) {
cand.preference = pref = odata[0];
+ } else if (otype == DHCPV6_OPT_UNICAST && olen == sizeof(cand.server_addr)) {
+ cand.server_addr = *(struct in6_addr *)odata;
} else if (otype == DHCPV6_OPT_RECONF_ACCEPT) {
cand.wants_reconfigure = true;
} else if (otype == DHCPV6_OPT_IA_PD && request_prefix) {
odhcp6c_add_state(STATE_SERVER_ID, hdr, sizeof(hdr));
odhcp6c_add_state(STATE_SERVER_ID, c->duid, c->duid_len);
accept_reconfig = c->wants_reconfigure;
+ server_addr = c->server_addr;
if (c->ia_na_len)
odhcp6c_add_state(STATE_IA_NA, c->ia_na, c->ia_na_len);
if (c->ia_pd_len)
continue;
dhcpv6_parse_ia(ia_hdr, odata + olen + sizeof(*ia_hdr));
+ } else if (otype == DHCPV6_OPT_UNICAST && olen == sizeof(server_addr)) {
+ server_addr = *(struct in6_addr *)odata;
} else if (otype == DHCPV6_OPT_STATUS && olen >= 2) {
uint8_t *mdata = (olen > 2) ? &odata[2] : NULL;
uint16_t mlen = (olen > 2) ? olen - 2 : 0;
break;
case DHCPV6_UseMulticast:
- // TODO handle multicast status code
+ switch(orig) {
+ case DHCPV6_MSG_REQUEST:
+ case DHCPV6_MSG_RENEW:
+ case DHCPV6_MSG_RELEASE:
+ case DHCPV6_MSG_DECLINE:
+ // Message needs to be retransmitted according to RFC3315 chapter 18.1.8
+ server_addr = in6addr_any;
+ *ret = 0;
+ break;
+ default:
+ break;
+ }
break;
case DHCPV6_NoAddrsAvail: