|
|
@@ -0,0 +1,781 @@
|
|
|
+/**
|
|
|
+ * Copyright (C) 2012 Steven Barth <steven@midlink.org>
|
|
|
+ *
|
|
|
+ * This program is free software; you can redistribute it and/or modify
|
|
|
+ * it under the terms of the GNU General Public License v2 as published by
|
|
|
+ * the Free Software Foundation.
|
|
|
+ *
|
|
|
+ * This program is distributed in the hope that it will be useful,
|
|
|
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
|
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
|
+ * GNU General Public License for more details.
|
|
|
+ *
|
|
|
+ */
|
|
|
+
|
|
|
+#include <time.h>
|
|
|
+#include <fcntl.h>
|
|
|
+#include <errno.h>
|
|
|
+#include <signal.h>
|
|
|
+#include <limits.h>
|
|
|
+#include <resolv.h>
|
|
|
+#include <string.h>
|
|
|
+#include <unistd.h>
|
|
|
+#include <syslog.h>
|
|
|
+#include <stdbool.h>
|
|
|
+#include <sys/time.h>
|
|
|
+#include <sys/ioctl.h>
|
|
|
+#include <sys/socket.h>
|
|
|
+#include <netinet/in.h>
|
|
|
+
|
|
|
+#include <net/if.h>
|
|
|
+#include <net/ethernet.h>
|
|
|
+
|
|
|
+#include "odhcp6c.h"
|
|
|
+
|
|
|
+
|
|
|
+#define ALL_DHCPV6_RELAYS {{{0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,\
|
|
|
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x02}}}
|
|
|
+#define DHCPV6_CLIENT_PORT 546
|
|
|
+#define DHCPV6_SERVER_PORT 547
|
|
|
+#define DHCPV6_DUID_LLADDR 3
|
|
|
+#define DHCPV6_REQ_DELAY 1
|
|
|
+
|
|
|
+
|
|
|
+static bool dhcpv6_response_is_valid(const void *buf, ssize_t len,
|
|
|
+ const uint8_t transaction[3], enum dhcpv6_msg type);
|
|
|
+
|
|
|
+static time_t dhcpv6_parse_ia(void *opt, void *end);
|
|
|
+
|
|
|
+static reply_handler dhcpv6_handle_reply;
|
|
|
+static reply_handler dhcpv6_handle_advert;
|
|
|
+static reply_handler dhcpv6_handle_rebind_reply;
|
|
|
+static reply_handler dhcpv6_handle_reconfigure;
|
|
|
+static int dhcpv6_commit_advert(uint32_t elapsed);
|
|
|
+
|
|
|
+
|
|
|
+
|
|
|
+// RFC 3315 - 5.5 Timeout and Delay values
|
|
|
+static struct dhcpv6_retx dhcpv6_retx[_DHCPV6_MSG_MAX] = {
|
|
|
+ [DHCPV6_MSG_UNKNOWN] = {false, 1, 120, "<POLL>",
|
|
|
+ dhcpv6_handle_reconfigure, NULL},
|
|
|
+ [DHCPV6_MSG_SOLICIT] = {true, 1, 120, "SOLICIT",
|
|
|
+ dhcpv6_handle_advert, dhcpv6_commit_advert},
|
|
|
+ [DHCPV6_MSG_REQUEST] = {true, 30, 10, "REQUEST",
|
|
|
+ dhcpv6_handle_reply, NULL},
|
|
|
+ [DHCPV6_MSG_RENEW] = {false, 10, 600, "RENEW",
|
|
|
+ dhcpv6_handle_reply, NULL},
|
|
|
+ [DHCPV6_MSG_REBIND] = {false, 10, 600, "REBIND",
|
|
|
+ dhcpv6_handle_rebind_reply, NULL},
|
|
|
+ [DHCPV6_MSG_RELEASE] = {false, 1, 600, "RELEASE", NULL, NULL},
|
|
|
+ [DHCPV6_MSG_DECLINE] = {false, 1, 3, "DECLINE", NULL, NULL},
|
|
|
+ [DHCPV6_MSG_INFO_REQ] = {true, 1, 120, "INFOREQ",
|
|
|
+ dhcpv6_handle_reply, NULL},
|
|
|
+};
|
|
|
+
|
|
|
+
|
|
|
+// Sockets
|
|
|
+static int sock = -1;
|
|
|
+static int urandom_fd = -1;
|
|
|
+static int ifindex = -1;
|
|
|
+static time_t t1 = 0, t2 = 0, t3 = 0;
|
|
|
+
|
|
|
+// IA states
|
|
|
+static int request_prefix = -1;
|
|
|
+static enum odhcp6c_ia_mode na_mode = IA_MODE_NONE;
|
|
|
+static bool accept_reconfig = false;
|
|
|
+
|
|
|
+
|
|
|
+
|
|
|
+int init_dhcpv6(const char *ifname, int request_pd)
|
|
|
+{
|
|
|
+ request_prefix = request_pd;
|
|
|
+ urandom_fd = open("/dev/urandom", O_CLOEXEC | O_RDONLY);
|
|
|
+ if (urandom_fd < 0)
|
|
|
+ return -1;
|
|
|
+
|
|
|
+ sock = socket(AF_INET6, SOCK_DGRAM | SOCK_CLOEXEC, IPPROTO_UDP);
|
|
|
+
|
|
|
+ // Detect interface
|
|
|
+ struct ifreq ifr;
|
|
|
+ strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
|
|
|
+ if (ioctl(sock, SIOCGIFINDEX, &ifr))
|
|
|
+ return -1;
|
|
|
+ ifindex = ifr.ifr_ifindex;
|
|
|
+
|
|
|
+ // Create client DUID
|
|
|
+ size_t client_id_len;
|
|
|
+ odhcp6c_get_state(STATE_CLIENT_ID, &client_id_len);
|
|
|
+ if (client_id_len == 0) {
|
|
|
+ ioctl(sock, SIOCGIFHWADDR, &ifr);
|
|
|
+ uint8_t duid[14] = {0, DHCPV6_OPT_CLIENTID, 0, 10, 0,
|
|
|
+ DHCPV6_DUID_LLADDR, 0, 1};
|
|
|
+ memcpy(&duid[8], ifr.ifr_hwaddr.sa_data, ETHER_ADDR_LEN);
|
|
|
+ odhcp6c_add_state(STATE_CLIENT_ID, duid, sizeof(duid));
|
|
|
+ }
|
|
|
+
|
|
|
+ // Create ORO
|
|
|
+ uint16_t oro[] = {htons(DHCPV6_OPT_DNS_SERVERS),
|
|
|
+ htons(DHCPV6_OPT_DNS_DOMAIN)};
|
|
|
+ odhcp6c_add_state(STATE_ORO, oro, sizeof(oro));
|
|
|
+
|
|
|
+
|
|
|
+ // 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, 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)))
|
|
|
+ return -1;
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+void dhcpv6_set_ia_na_mode(enum odhcp6c_ia_mode mode)
|
|
|
+{
|
|
|
+ na_mode = mode;
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+void dhcpv6_remove_addrs(void)
|
|
|
+{
|
|
|
+ size_t ia_na_len;
|
|
|
+ uint8_t *odata, *ia_na = odhcp6c_get_state(STATE_IA_NA, &ia_na_len);
|
|
|
+ uint16_t otype, olen;
|
|
|
+ dhcpv6_for_each_option(ia_na, ia_na + ia_na_len, otype, olen, odata) {
|
|
|
+ struct dhcpv6_ia_addr *addr = (void*)&odata[-4];
|
|
|
+ set_rtnetlink_addr(ifindex, &addr->addr, 0, 0);
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+static void dhcpv6_send(enum dhcpv6_msg type, uint8_t trid[3], uint32_t ecs)
|
|
|
+{
|
|
|
+ // Build FQDN
|
|
|
+ char fqdn_buf[256];
|
|
|
+ gethostname(fqdn_buf, sizeof(fqdn_buf));
|
|
|
+ struct {
|
|
|
+ uint16_t type;
|
|
|
+ uint16_t len;
|
|
|
+ uint8_t flags;
|
|
|
+ uint8_t data[256];
|
|
|
+ } fqdn;
|
|
|
+ size_t fqdn_len = 5 + dn_comp(fqdn_buf, fqdn.data,
|
|
|
+ sizeof(fqdn.data), NULL, NULL);
|
|
|
+ fqdn.type = htons(DHCPV6_OPT_FQDN);
|
|
|
+ fqdn.len = htons(fqdn_len - 4);
|
|
|
+ fqdn.flags = 0;
|
|
|
+
|
|
|
+
|
|
|
+ // Build Client ID
|
|
|
+ size_t cl_id_len;
|
|
|
+ void *cl_id = odhcp6c_get_state(STATE_CLIENT_ID, &cl_id_len);
|
|
|
+
|
|
|
+ // Get Server ID
|
|
|
+ size_t srv_id_len;
|
|
|
+ void *srv_id = odhcp6c_get_state(STATE_SERVER_ID, &srv_id_len);
|
|
|
+
|
|
|
+ // Build IA_PDs
|
|
|
+ size_t ia_pd_len;
|
|
|
+ void *ia_pd = odhcp6c_get_state(STATE_IA_PD, &ia_pd_len);
|
|
|
+ struct dhcpv6_ia_hdr hdr_ia_pd = {
|
|
|
+ htons(DHCPV6_OPT_IA_PD),
|
|
|
+ htons(sizeof(hdr_ia_pd) - 4 + ia_pd_len),
|
|
|
+ 1, 0, 0
|
|
|
+ };
|
|
|
+
|
|
|
+ struct dhcpv6_ia_prefix pref = {
|
|
|
+ .type = htons(DHCPV6_OPT_IA_PREFIX),
|
|
|
+ .len = htons(25), .prefix = request_prefix
|
|
|
+ };
|
|
|
+
|
|
|
+ if (ia_pd_len == 0 && request_prefix > 0 &&
|
|
|
+ (type == DHCPV6_MSG_SOLICIT ||
|
|
|
+ type == DHCPV6_MSG_REQUEST)) {
|
|
|
+ ia_pd = &pref;
|
|
|
+ ia_pd_len = sizeof(pref);
|
|
|
+ }
|
|
|
+
|
|
|
+ // Build IA_NAs
|
|
|
+ size_t ia_na_len;
|
|
|
+ void *ia_na = odhcp6c_get_state(STATE_IA_NA, &ia_na_len);
|
|
|
+ struct dhcpv6_ia_hdr hdr_ia_na = {
|
|
|
+ htons(DHCPV6_OPT_IA_NA),
|
|
|
+ htons(sizeof(hdr_ia_na) - 4 + ia_na_len),
|
|
|
+ 1, 0, 0
|
|
|
+ };
|
|
|
+
|
|
|
+ // Reconfigure Accept
|
|
|
+ struct {
|
|
|
+ uint16_t type;
|
|
|
+ uint16_t length;
|
|
|
+ } reconf_accept = {htons(DHCPV6_OPT_RECONF_ACCEPT), 0};
|
|
|
+
|
|
|
+ // Request Information Refresh
|
|
|
+ uint16_t oro_refresh = htons(DHCPV6_OPT_INFO_REFRESH);
|
|
|
+
|
|
|
+ // Prepare Header
|
|
|
+ size_t oro_len;
|
|
|
+ void *oro = odhcp6c_get_state(STATE_ORO, &oro_len);
|
|
|
+ struct {
|
|
|
+ uint8_t type;
|
|
|
+ uint8_t trid[3];
|
|
|
+ uint16_t elapsed_type;
|
|
|
+ uint16_t elapsed_len;
|
|
|
+ uint16_t elapsed_value;
|
|
|
+ uint16_t oro_type;
|
|
|
+ uint16_t oro_len;
|
|
|
+ } hdr = {
|
|
|
+ type, {trid[0], trid[1], trid[2]},
|
|
|
+ htons(DHCPV6_OPT_ELAPSED), htons(2),
|
|
|
+ htons((ecs > 0xffff) ? 0xffff : ecs),
|
|
|
+ htons(DHCPV6_OPT_ORO), htons(oro_len),
|
|
|
+ };
|
|
|
+
|
|
|
+ struct iovec iov[] = {
|
|
|
+ {&hdr, sizeof(hdr)},
|
|
|
+ {oro, oro_len},
|
|
|
+ {&oro_refresh, 0},
|
|
|
+ {cl_id, cl_id_len},
|
|
|
+ {srv_id, srv_id_len},
|
|
|
+ {&reconf_accept, 0},
|
|
|
+ {&fqdn, fqdn_len},
|
|
|
+ {&hdr_ia_na, sizeof(hdr_ia_na)},
|
|
|
+ {ia_na, ia_na_len},
|
|
|
+ {&hdr_ia_pd, sizeof(hdr_ia_pd)},
|
|
|
+ {ia_pd, ia_pd_len},
|
|
|
+ };
|
|
|
+
|
|
|
+ size_t cnt = ARRAY_SIZE(iov);
|
|
|
+ if (type == DHCPV6_MSG_INFO_REQ) {
|
|
|
+ cnt = 5;
|
|
|
+ iov[2].iov_len = sizeof(oro_refresh);
|
|
|
+ hdr.oro_len = htons(oro_len + sizeof(oro_refresh));
|
|
|
+ } else if (!request_prefix) {
|
|
|
+ cnt = 9;
|
|
|
+ }
|
|
|
+
|
|
|
+ // Disable IAs if not used
|
|
|
+ if (type == DHCPV6_MSG_SOLICIT) {
|
|
|
+ iov[5].iov_len = sizeof(reconf_accept);
|
|
|
+ } else if (type != DHCPV6_MSG_REQUEST) {
|
|
|
+ if (ia_na_len == 0)
|
|
|
+ iov[7].iov_len = 0;
|
|
|
+ if (ia_pd_len == 0)
|
|
|
+ iov[9].iov_len = 0;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (na_mode == IA_MODE_NONE)
|
|
|
+ iov[7].iov_len = 0;
|
|
|
+
|
|
|
+ struct sockaddr_in6 srv = {AF_INET6, htons(DHCPV6_SERVER_PORT),
|
|
|
+ 0, ALL_DHCPV6_RELAYS, ifindex};
|
|
|
+ struct msghdr msg = {&srv, sizeof(srv), iov, cnt, NULL, 0, 0};
|
|
|
+
|
|
|
+ sendmsg(sock, &msg, 0);
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+static int64_t dhcpv6_rand_delay(int64_t time)
|
|
|
+{
|
|
|
+ int random;
|
|
|
+ read(urandom_fd, &random, sizeof(random));
|
|
|
+ return (time * (random % 1000)) / 10000;
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+int dhcpv6_request(enum dhcpv6_msg type)
|
|
|
+{
|
|
|
+ uint8_t buf[1536];
|
|
|
+ uint32_t timeout = UINT32_MAX;
|
|
|
+ struct dhcpv6_retx *retx = &dhcpv6_retx[type];
|
|
|
+
|
|
|
+ if (retx->delay) {
|
|
|
+ struct timespec ts = {0, 0};
|
|
|
+ ts.tv_nsec = dhcpv6_rand_delay(10 * DHCPV6_REQ_DELAY);
|
|
|
+ nanosleep(&ts, NULL);
|
|
|
+ }
|
|
|
+
|
|
|
+ if (type == DHCPV6_MSG_RELEASE || type == DHCPV6_MSG_DECLINE)
|
|
|
+ timeout = 3;
|
|
|
+ else if (type == DHCPV6_MSG_UNKNOWN)
|
|
|
+ timeout = t1;
|
|
|
+ else if (type == DHCPV6_MSG_RENEW)
|
|
|
+ timeout = t2 - t1;
|
|
|
+ else if (type == DHCPV6_MSG_REBIND)
|
|
|
+ timeout = t3 - t2;
|
|
|
+
|
|
|
+ if (timeout == 0)
|
|
|
+ return -1;
|
|
|
+
|
|
|
+ syslog(LOG_NOTICE, "Sending %s (timeout %us)", retx->name, timeout);
|
|
|
+
|
|
|
+ uint64_t start = adhc6c_get_milli_time(), round_start = start, elapsed;
|
|
|
+
|
|
|
+ // Generate transaction ID
|
|
|
+ uint8_t trid[3];
|
|
|
+ read(urandom_fd, trid, sizeof(trid));
|
|
|
+ ssize_t len = -1;
|
|
|
+ int64_t rto = 0;
|
|
|
+
|
|
|
+ do {
|
|
|
+ rto = (rto == 0) ? (retx->init_timeo * 1000 +
|
|
|
+ dhcpv6_rand_delay(retx->init_timeo * 1000)) :
|
|
|
+ (2 * rto + dhcpv6_rand_delay(rto));
|
|
|
+
|
|
|
+ if (rto >= retx->max_timeo * 1000)
|
|
|
+ rto = retx->max_timeo * 1000 +
|
|
|
+ dhcpv6_rand_delay(retx->max_timeo * 1000);
|
|
|
+
|
|
|
+ // Calculate end for this round and elapsed time
|
|
|
+ uint64_t round_end = round_start + rto;
|
|
|
+ elapsed = round_start - start;
|
|
|
+
|
|
|
+ // Don't wait too long
|
|
|
+ if (round_end - start > timeout * 1000)
|
|
|
+ round_end = timeout * 1000 + start;
|
|
|
+
|
|
|
+ // Built and send package
|
|
|
+ if (type != DHCPV6_MSG_UNKNOWN)
|
|
|
+ dhcpv6_send(type, trid, elapsed / 10);
|
|
|
+
|
|
|
+ // Receive rounds
|
|
|
+ for (; len < 0 && round_start < round_end;
|
|
|
+ round_start = adhc6c_get_milli_time()) {
|
|
|
+ // Check for pending signal
|
|
|
+ if (odhcp6c_signal_is_pending())
|
|
|
+ return -1;
|
|
|
+
|
|
|
+ // Set timeout for receiving
|
|
|
+ uint64_t t = round_end - round_start;
|
|
|
+ struct timeval timeout = {t / 1000, (t % 1000) * 1000};
|
|
|
+ setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO,
|
|
|
+ &timeout, sizeof(timeout));
|
|
|
+
|
|
|
+ // Receive cycle
|
|
|
+ len = recv(sock, buf, sizeof(buf), 0);
|
|
|
+
|
|
|
+ if (!dhcpv6_response_is_valid(buf, len, trid, type))
|
|
|
+ len = -1;
|
|
|
+
|
|
|
+ if (len > 0) {
|
|
|
+ uint8_t *opt = &buf[4];
|
|
|
+ uint8_t *opt_end = opt + len - 4;
|
|
|
+
|
|
|
+ round_start = adhc6c_get_milli_time();
|
|
|
+ elapsed = round_start - start;
|
|
|
+ syslog(LOG_NOTICE, "Got a valid reply after "
|
|
|
+ "%ums", (unsigned)elapsed);
|
|
|
+
|
|
|
+ if (retx->handler_reply)
|
|
|
+ len = retx->handler_reply(type,
|
|
|
+ opt, opt_end, elapsed / 1000);
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ // Allow
|
|
|
+ if (retx->handler_finish)
|
|
|
+ len = retx->handler_finish(elapsed / 1000);
|
|
|
+ } while (len < 0 && elapsed / 1000 < timeout);
|
|
|
+
|
|
|
+ return len;
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+static bool dhcpv6_response_is_valid(const void *buf, ssize_t len,
|
|
|
+ const uint8_t transaction[3], enum dhcpv6_msg type)
|
|
|
+{
|
|
|
+ const struct dhcpv6_header *rep = buf;
|
|
|
+ if (len < (ssize_t)sizeof(*rep) || memcmp(rep->tr_id,
|
|
|
+ transaction, sizeof(rep->tr_id)))
|
|
|
+ return false; // Invalid reply
|
|
|
+
|
|
|
+ if (type == DHCPV6_MSG_SOLICIT) {
|
|
|
+ if (rep->msg_type != DHCPV6_MSG_ADVERT &&
|
|
|
+ rep->msg_type != DHCPV6_MSG_REPLY)
|
|
|
+ return false;
|
|
|
+ } else if (type == DHCPV6_MSG_UNKNOWN) {
|
|
|
+ if (!accept_reconfig || rep->msg_type != DHCPV6_MSG_RECONF)
|
|
|
+ return false;
|
|
|
+ } else if (rep->msg_type != DHCPV6_MSG_REPLY) {
|
|
|
+ return false;
|
|
|
+ }
|
|
|
+
|
|
|
+ uint8_t *end = ((uint8_t*)buf) + len, *odata;
|
|
|
+ uint16_t otype, olen;
|
|
|
+ bool clientid_ok = false, serverid_ok = false;
|
|
|
+
|
|
|
+ size_t client_id_len, server_id_len;
|
|
|
+ void *client_id = odhcp6c_get_state(STATE_CLIENT_ID, &client_id_len);
|
|
|
+ void *server_id = odhcp6c_get_state(STATE_SERVER_ID, &server_id_len);
|
|
|
+
|
|
|
+ dhcpv6_for_each_option(&rep[1], end, otype, olen, odata)
|
|
|
+ if (otype == DHCPV6_OPT_CLIENTID)
|
|
|
+ clientid_ok = (olen + 4U == client_id_len) && !memcmp(
|
|
|
+ &odata[-4], client_id, client_id_len);
|
|
|
+ else if (otype == DHCPV6_OPT_SERVERID)
|
|
|
+ serverid_ok = (olen + 4U == server_id_len) && !memcmp(
|
|
|
+ &odata[-4], server_id, server_id_len);
|
|
|
+
|
|
|
+ return clientid_ok && (serverid_ok || server_id_len == 0);
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+int dhcpv6_poll_reconfigure(void)
|
|
|
+{
|
|
|
+ int ret = dhcpv6_request(DHCPV6_MSG_UNKNOWN);
|
|
|
+ if (ret != -1)
|
|
|
+ ret = dhcpv6_request(ret);
|
|
|
+
|
|
|
+ return ret;
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+static int dhcpv6_handle_reconfigure(_unused enum dhcpv6_msg orig,
|
|
|
+ const void *opt, const void *end, uint32_t elapsed)
|
|
|
+{
|
|
|
+ // TODO: should verify the reconfigure message
|
|
|
+ uint16_t otype, olen;
|
|
|
+ uint8_t *odata, msg = DHCPV6_MSG_RENEW;
|
|
|
+ dhcpv6_for_each_option(opt, end, otype, olen, odata)
|
|
|
+ if (otype == DHCPV6_OPT_RECONF_MESSAGE && olen == 1 && (
|
|
|
+ odata[0] == DHCPV6_MSG_RENEW ||
|
|
|
+ odata[0] == DHCPV6_MSG_INFO_REQ))
|
|
|
+ msg = odata[0];
|
|
|
+
|
|
|
+ t1 -= elapsed;
|
|
|
+ t2 -= elapsed;
|
|
|
+ t3 -= elapsed;
|
|
|
+
|
|
|
+ if (t1 < 0)
|
|
|
+ t1 = 0;
|
|
|
+
|
|
|
+ if (t2 < 0)
|
|
|
+ t2 = 0;
|
|
|
+
|
|
|
+ if (t3 < 0)
|
|
|
+ t3 = 0;
|
|
|
+
|
|
|
+ dhcpv6_handle_reply(DHCPV6_MSG_UNKNOWN, NULL, NULL, elapsed);
|
|
|
+ return msg;
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+// Collect all advertised servers
|
|
|
+static int dhcpv6_handle_advert(_unused enum dhcpv6_msg orig,
|
|
|
+ const void *opt, const void *end, _unused uint32_t elapsed)
|
|
|
+{
|
|
|
+ uint16_t olen, otype;
|
|
|
+ uint8_t *odata;
|
|
|
+ struct dhcpv6_server_cand cand = {false, false, 0, 0, {0}};
|
|
|
+
|
|
|
+ dhcpv6_for_each_option(opt, end, otype, olen, odata) {
|
|
|
+ if (otype == DHCPV6_OPT_SERVERID && olen <= 130) {
|
|
|
+ memcpy(cand.duid, odata, olen);
|
|
|
+ cand.duid_len = olen;
|
|
|
+ } else if (otype == DHCPV6_OPT_STATUS && olen >= 2 &&
|
|
|
+ !odata[0] && odata[1] == DHCPV6_NoAddrsAvail) {
|
|
|
+ if (na_mode == IA_MODE_FORCE) {
|
|
|
+ return -1;
|
|
|
+ } else {
|
|
|
+ cand.has_noaddravail = true;
|
|
|
+ cand.preference -= 1000;
|
|
|
+ }
|
|
|
+ } else if (otype == DHCPV6_OPT_PREF && olen >= 1 &&
|
|
|
+ cand.preference >= 0) {
|
|
|
+ cand.preference = odata[1];
|
|
|
+ } else if (otype == DHCPV6_OPT_RECONF_ACCEPT) {
|
|
|
+ cand.wants_reconfigure = true;
|
|
|
+ }
|
|
|
+ else if (otype == DHCPV6_OPT_IA_PD && request_prefix) {
|
|
|
+ struct dhcpv6_ia_hdr *h = (void*)odata;
|
|
|
+ uint8_t *oend = odata + olen, *d;
|
|
|
+ dhcpv6_for_each_option(&h[1], oend, otype, olen, d) {
|
|
|
+ if (otype == DHCPV6_OPT_IA_PREFIX)
|
|
|
+ cand.preference += 2000;
|
|
|
+ else if (otype == DHCPV6_OPT_STATUS &&
|
|
|
+ olen >= 2 && d[0] == 0 &&
|
|
|
+ d[1] == DHCPV6_NoPrefixAvail)
|
|
|
+ return -1;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ if (cand.duid_len > 0)
|
|
|
+ odhcp6c_add_state(STATE_SERVER_CAND, &cand, sizeof(cand));
|
|
|
+
|
|
|
+ return -1;
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+static int dhcpv6_commit_advert(_unused uint32_t elapsed)
|
|
|
+{
|
|
|
+ size_t cand_len;
|
|
|
+ struct dhcpv6_server_cand *c = NULL, *cand =
|
|
|
+ odhcp6c_get_state(STATE_SERVER_CAND, &cand_len);
|
|
|
+
|
|
|
+ bool retry = false;
|
|
|
+ for (size_t i = 0; i < cand_len / sizeof(*c); ++i) {
|
|
|
+ if (cand[i].has_noaddravail)
|
|
|
+ retry = true; // We want to try again
|
|
|
+
|
|
|
+ if (!c || c->preference < cand[i].preference)
|
|
|
+ c = &cand[i];
|
|
|
+ }
|
|
|
+
|
|
|
+ if (retry && na_mode == IA_MODE_TRY) {
|
|
|
+ // We give it a second try without the IA_NA
|
|
|
+ na_mode = IA_MODE_NONE;
|
|
|
+ return dhcpv6_request(DHCPV6_MSG_SOLICIT);
|
|
|
+ }
|
|
|
+
|
|
|
+ if (c) {
|
|
|
+ uint16_t hdr[2] = {htons(DHCPV6_OPT_SERVERID),
|
|
|
+ htons(c->duid_len)};
|
|
|
+ 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;
|
|
|
+ }
|
|
|
+
|
|
|
+ odhcp6c_clear_state(STATE_SERVER_CAND);
|
|
|
+
|
|
|
+ if (!c)
|
|
|
+ return -1;
|
|
|
+ else if (request_prefix || na_mode != IA_MODE_NONE)
|
|
|
+ return DHCPV6_STATEFUL;
|
|
|
+ else
|
|
|
+ return DHCPV6_STATELESS;
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+static int dhcpv6_handle_rebind_reply(enum dhcpv6_msg orig,
|
|
|
+ const void *opt, const void *end, uint32_t elapsed)
|
|
|
+{
|
|
|
+ dhcpv6_handle_advert(orig, opt, end, elapsed);
|
|
|
+ if (dhcpv6_commit_advert(elapsed) < 0)
|
|
|
+ return -1;
|
|
|
+
|
|
|
+ return dhcpv6_handle_reply(orig, opt, end, elapsed);
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+static int dhcpv6_handle_reply(_unused enum dhcpv6_msg orig,
|
|
|
+ const void *opt, const void *end, uint32_t elapsed)
|
|
|
+{
|
|
|
+ uint16_t otype, olen;
|
|
|
+ uint8_t *odata;
|
|
|
+ bool have_update = false;
|
|
|
+
|
|
|
+ t1 = t2 = t3 = 86400;
|
|
|
+
|
|
|
+ size_t ia_na_len, dns_len, search_len;
|
|
|
+ uint8_t *ia_na = odhcp6c_get_state(STATE_IA_NA, &ia_na_len);
|
|
|
+ uint8_t *ia_end;
|
|
|
+ odhcp6c_get_state(STATE_DNS, &dns_len);
|
|
|
+ odhcp6c_get_state(STATE_SEARCH, &search_len);
|
|
|
+
|
|
|
+ // Decrease valid and preferred lifetime of prefixes
|
|
|
+ size_t ia_pd_len;
|
|
|
+ uint8_t *ia_pd = odhcp6c_get_state(STATE_IA_PD, &ia_pd_len);
|
|
|
+ dhcpv6_for_each_option(ia_pd, ia_pd + ia_pd_len, otype, olen, odata) {
|
|
|
+ struct dhcpv6_ia_prefix *p = (void*)&odata[-4];
|
|
|
+ uint32_t valid = ntohl(p->valid);
|
|
|
+ p->valid = (valid < elapsed) ? 0 : htonl(valid - elapsed);
|
|
|
+
|
|
|
+ uint32_t pref = ntohl(p->preferred);
|
|
|
+ p->preferred = (pref < elapsed) ? 0 : htonl(pref - elapsed);
|
|
|
+ }
|
|
|
+
|
|
|
+ // Decrease valid and preferred lifetime of addresses
|
|
|
+ dhcpv6_for_each_option(ia_na, ia_na + ia_na_len, otype, olen, odata) {
|
|
|
+ struct dhcpv6_ia_addr *p = (void*)&odata[-4];
|
|
|
+ uint32_t valid = ntohl(p->valid);
|
|
|
+ p->valid = (valid < elapsed) ? 0 : htonl(valid - elapsed);
|
|
|
+
|
|
|
+ uint32_t pref = ntohl(p->preferred);
|
|
|
+ p->preferred = (pref < elapsed) ? 0 : htonl(pref - elapsed);
|
|
|
+ }
|
|
|
+
|
|
|
+ // Parse and find all matching IAs
|
|
|
+ dhcpv6_for_each_option(opt, end, otype, olen, odata) {
|
|
|
+ if ((otype == DHCPV6_OPT_IA_PD || otype == DHCPV6_OPT_IA_NA)
|
|
|
+ && olen > sizeof(struct dhcpv6_ia_hdr)) {
|
|
|
+ struct dhcpv6_ia_hdr *ia_hdr = (void*)(&odata[-4]);
|
|
|
+ time_t l_t1 = ntohl(ia_hdr->t1);
|
|
|
+ time_t l_t2 = ntohl(ia_hdr->t2);
|
|
|
+
|
|
|
+ // Test ID and T1-T2 validity
|
|
|
+ if (ia_hdr->iaid != 1 || l_t2 < l_t1)
|
|
|
+ continue;
|
|
|
+
|
|
|
+ uint16_t stype, slen;
|
|
|
+ uint8_t *sdata;
|
|
|
+ // Test status and bail if error
|
|
|
+ dhcpv6_for_each_option(&ia_hdr[1], odata + olen,
|
|
|
+ stype, slen, sdata)
|
|
|
+ if (stype == DHCPV6_OPT_STATUS && slen >= 2 &&
|
|
|
+ (sdata[0] || sdata[1]))
|
|
|
+ continue;
|
|
|
+
|
|
|
+ // Update times
|
|
|
+ if (l_t1 > 0 && t1 > l_t1)
|
|
|
+ t1 = l_t1;
|
|
|
+
|
|
|
+ if (l_t2 > 0 && t2 > l_t2)
|
|
|
+ t2 = l_t2;
|
|
|
+
|
|
|
+
|
|
|
+ time_t n = dhcpv6_parse_ia(&ia_hdr[1], odata + olen);
|
|
|
+
|
|
|
+ if (n < t1)
|
|
|
+ t1 = n;
|
|
|
+
|
|
|
+ if (n < t2)
|
|
|
+ t2 = n;
|
|
|
+
|
|
|
+ if (n < t3)
|
|
|
+ t3 = n;
|
|
|
+
|
|
|
+ } else if (otype == DHCPV6_OPT_DNS_SERVERS) {
|
|
|
+ odhcp6c_add_state(STATE_DNS, odata, olen);
|
|
|
+ } else if (otype == DHCPV6_OPT_DNS_DOMAIN) {
|
|
|
+ odhcp6c_add_state(STATE_SEARCH, odata, olen);
|
|
|
+ } else if (otype == DHCPV6_OPT_INFO_REFRESH && olen >= 4) {
|
|
|
+ uint32_t refresh = ntohl(*((uint32_t*)odata));
|
|
|
+ if (refresh < (uint32_t)t1)
|
|
|
+ t1 = refresh;
|
|
|
+ } else if (otype != DHCPV6_OPT_CLIENTID &&
|
|
|
+ otype != DHCPV6_OPT_SERVERID) {
|
|
|
+ odhcp6c_add_state(STATE_CUSTOM_OPTS,
|
|
|
+ &odata[-4], olen + 4);
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ if (opt) {
|
|
|
+ have_update |= odhcp6c_commit_state(STATE_DNS, dns_len);
|
|
|
+ have_update |= odhcp6c_commit_state(STATE_SEARCH, search_len);
|
|
|
+ size_t new_ia_pd_len, new_ia_na_len;
|
|
|
+ odhcp6c_get_state(STATE_IA_PD, &new_ia_pd_len);
|
|
|
+ odhcp6c_get_state(STATE_IA_NA, &new_ia_na_len);
|
|
|
+ have_update |= (new_ia_pd_len != ia_pd_len) ||
|
|
|
+ (new_ia_na_len != ia_na_len);
|
|
|
+ }
|
|
|
+
|
|
|
+ // Delete prefixes with 0 valid-time
|
|
|
+ ia_pd = odhcp6c_get_state(STATE_IA_PD, &ia_pd_len);
|
|
|
+ ia_end = ia_pd + ia_pd_len;
|
|
|
+ dhcpv6_for_each_option(ia_pd, ia_end, otype, olen, odata) {
|
|
|
+ struct dhcpv6_ia_prefix *p = (void*)&odata[-4];
|
|
|
+ while (!p->valid) {
|
|
|
+ ia_end = ia_pd + odhcp6c_remove_state(STATE_IA_PD,
|
|
|
+ (uint8_t*)p - ia_pd, olen + 4);
|
|
|
+ have_update = true;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+
|
|
|
+ // Delete addresses with 0 valid-time
|
|
|
+ ia_na = odhcp6c_get_state(STATE_IA_NA, &ia_na_len);
|
|
|
+ ia_end = ia_na + ia_na_len;
|
|
|
+ dhcpv6_for_each_option(ia_na, ia_end, otype, olen, odata) {
|
|
|
+ struct dhcpv6_ia_addr *p = (void*)&odata[-4];
|
|
|
+ while (!p->valid) {
|
|
|
+ ia_end = ia_na + odhcp6c_remove_state(STATE_IA_NA,
|
|
|
+ (uint8_t*)p - ia_na, olen + 4);
|
|
|
+ have_update = true;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ return have_update;
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+static time_t dhcpv6_parse_ia(void *opt, void *end)
|
|
|
+{
|
|
|
+ uint32_t timeout = UINT32_MAX; // Minimum timeout
|
|
|
+ uint16_t otype, olen, stype, slen;
|
|
|
+ uint8_t *odata, *sdata;
|
|
|
+
|
|
|
+ // Update address IA
|
|
|
+ dhcpv6_for_each_option(opt, end, otype, olen, odata) {
|
|
|
+ if (otype == DHCPV6_OPT_IA_PREFIX) {
|
|
|
+ struct dhcpv6_ia_prefix *prefix = (void*)&odata[-4];
|
|
|
+ if (olen + 4U < sizeof(*prefix))
|
|
|
+ continue;
|
|
|
+
|
|
|
+ olen = sizeof(*prefix); // Normalize length
|
|
|
+ uint32_t valid = ntohl(prefix->valid);
|
|
|
+ uint32_t pref = ntohl(prefix->preferred);
|
|
|
+
|
|
|
+ if (pref > valid)
|
|
|
+ continue;
|
|
|
+
|
|
|
+ // Search matching IA
|
|
|
+ struct dhcpv6_ia_prefix *local = NULL;
|
|
|
+ size_t pd_len;
|
|
|
+ uint8_t *pd = odhcp6c_get_state(STATE_IA_PD, &pd_len);
|
|
|
+ dhcpv6_for_each_option(pd, pd + pd_len,
|
|
|
+ stype, slen, sdata)
|
|
|
+ if (!memcmp(sdata + 8, odata + 8,
|
|
|
+ sizeof(local->addr) + 1))
|
|
|
+ local = (void*)&sdata[-4];
|
|
|
+
|
|
|
+ if (local) { // Already know that IA
|
|
|
+ local->preferred = prefix->preferred;
|
|
|
+ local->valid = prefix->valid;
|
|
|
+ } else { // New IA
|
|
|
+ odhcp6c_add_state(STATE_IA_PD, prefix, olen);
|
|
|
+ }
|
|
|
+
|
|
|
+ if (timeout > valid)
|
|
|
+ timeout = valid;
|
|
|
+
|
|
|
+ if (prefix->valid == 0) // We probably lost that prefix
|
|
|
+ odhcp6c_add_state(STATE_IA_PD_LOST,
|
|
|
+ prefix, olen);
|
|
|
+ } else if (otype == DHCPV6_OPT_IA_ADDR) {
|
|
|
+ struct dhcpv6_ia_addr *addr = (void*)&odata[-4];
|
|
|
+ if (olen + 4U < sizeof(*addr))
|
|
|
+ continue;
|
|
|
+
|
|
|
+ olen = sizeof(*addr); // Normalize length
|
|
|
+ uint32_t pref = ntohl(addr->preferred);
|
|
|
+ uint32_t valid = ntohl(addr->valid);
|
|
|
+
|
|
|
+ if (pref > valid)
|
|
|
+ continue;
|
|
|
+
|
|
|
+ // Search matching IA
|
|
|
+ struct dhcpv6_ia_addr *local = NULL;
|
|
|
+ size_t na_len;
|
|
|
+ uint8_t *na = odhcp6c_get_state(STATE_IA_NA, &na_len);
|
|
|
+ dhcpv6_for_each_option(na, na + na_len,
|
|
|
+ stype, slen, sdata)
|
|
|
+ if (!memcmp(sdata, odata, sizeof(local->addr)))
|
|
|
+ local = (void*)&sdata[-4];
|
|
|
+
|
|
|
+
|
|
|
+ if (local) { // Already know that IA
|
|
|
+ local->preferred = addr->preferred;
|
|
|
+ local->valid = addr->valid;
|
|
|
+ } else { // New IA
|
|
|
+ odhcp6c_add_state(STATE_IA_NA, addr, olen);
|
|
|
+ }
|
|
|
+
|
|
|
+
|
|
|
+ if (timeout > valid)
|
|
|
+ timeout = valid;
|
|
|
+
|
|
|
+ if (set_rtnetlink_addr(ifindex, &addr->addr,
|
|
|
+ pref, valid) == -EADDRNOTAVAIL) {
|
|
|
+ dhcpv6_request(DHCPV6_MSG_DECLINE);
|
|
|
+ raise(SIGUSR2);
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ return timeout;
|
|
|
+}
|
Steven Barth
11 years ago