/**
* Copyright (C) 2012-2013 Steven Barth <steven@midlink.org>
+ * Copyright (C) 2018 Hans Dedecker <dedeckeh@gmail.com>
*
* 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
#include <stddef.h>
#include <resolv.h>
#include <sys/timerfd.h>
+#include <arpa/inet.h>
+
+#include <libubox/utils.h>
#include "odhcpd.h"
#include "dhcpv6.h"
-
+#ifdef DHCPV4_SUPPORT
+#include "dhcpv4.h"
+#endif
static void relay_client_request(struct sockaddr_in6 *source,
const void *data, size_t len, struct interface *iface);
struct interface *iface, void *dest_addr);
-
-// Create socket and register events
-int init_dhcpv6(void)
+/* Create socket and register events */
+int dhcpv6_init(void)
{
- dhcpv6_ia_init();
- return 0;
+ return dhcpv6_ia_init();
}
-
-int setup_dhcpv6_interface(struct interface *iface, bool enable)
+int dhcpv6_setup_interface(struct interface *iface, bool enable)
{
- if (iface->dhcpv6_event.uloop.fd > 0) {
+ int ret = 0;
+
+ enable = enable && (iface->dhcpv6 != MODE_DISABLED);
+
+ if (iface->dhcpv6_event.uloop.fd >= 0) {
uloop_fd_delete(&iface->dhcpv6_event.uloop);
close(iface->dhcpv6_event.uloop.fd);
iface->dhcpv6_event.uloop.fd = -1;
}
- // Configure multicast settings
- if (enable && iface->dhcpv6 && !iface->master) {
- int sock = socket(AF_INET6, SOCK_DGRAM | SOCK_CLOEXEC, IPPROTO_UDP);
- if (sock < 0) {
- syslog(LOG_ERR, "Failed to create DHCPv6 server socket: %s",
- strerror(errno));
- return -1;
+ /* Configure multicast settings */
+ if (enable) {
+ struct sockaddr_in6 bind_addr = {AF_INET6, htons(DHCPV6_SERVER_PORT),
+ 0, IN6ADDR_ANY_INIT, 0};
+ struct ipv6_mreq mreq;
+ int val = 1;
+
+ iface->dhcpv6_event.uloop.fd = socket(AF_INET6, SOCK_DGRAM | SOCK_CLOEXEC, IPPROTO_UDP);
+ if (iface->dhcpv6_event.uloop.fd < 0) {
+ syslog(LOG_ERR, "socket(AF_INET6): %m");
+ ret = -1;
+ goto out;
}
- // Basic IPv6 configuration
- setsockopt(sock, SOL_SOCKET, SO_BINDTODEVICE, iface->ifname, strlen(iface->ifname));
+ /* Basic IPv6 configuration */
+ if (setsockopt(iface->dhcpv6_event.uloop.fd, SOL_SOCKET, SO_BINDTODEVICE,
+ iface->ifname, strlen(iface->ifname)) < 0) {
+ syslog(LOG_ERR, "setsockopt(SO_BINDTODEVICE): %m");
+ ret = -1;
+ goto out;
+ }
- 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));
+ if (setsockopt(iface->dhcpv6_event.uloop.fd, IPPROTO_IPV6, IPV6_V6ONLY,
+ &val, sizeof(val)) < 0) {
+ syslog(LOG_ERR, "setsockopt(IPV6_V6ONLY): %m");
+ ret = -1;
+ goto out;
+ }
+
+ if (setsockopt(iface->dhcpv6_event.uloop.fd, SOL_SOCKET, SO_REUSEADDR,
+ &val, sizeof(val)) < 0) {
+ syslog(LOG_ERR, "setsockopt(SO_REUSEADDR): %m");
+ ret = -1;
+ goto out;
+ }
+
+ if (setsockopt(iface->dhcpv6_event.uloop.fd, IPPROTO_IPV6, IPV6_RECVPKTINFO,
+ &val, sizeof(val)) < 0) {
+ syslog(LOG_ERR, "setsockopt(IPV6_RECVPKTINFO): %m");
+ ret = -1;
+ goto out;
+ }
val = DHCPV6_HOP_COUNT_LIMIT;
- setsockopt(sock, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &val, sizeof(val));
+ if (setsockopt(iface->dhcpv6_event.uloop.fd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS,
+ &val, sizeof(val)) < 0) {
+ syslog(LOG_ERR, "setsockopt(IPV6_MULTICAST_HOPS): %m");
+ ret = -1;
+ goto out;
+ }
val = 0;
- setsockopt(sock, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &val, sizeof(val));
+ if (setsockopt(iface->dhcpv6_event.uloop.fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,
+ &val, sizeof(val)) < 0) {
+ syslog(LOG_ERR, "setsockopt(IPV6_MULTICAST_LOOP): %m");
+ ret = -1;
+ goto out;
+ }
- struct sockaddr_in6 bind_addr = {AF_INET6, htons(DHCPV6_SERVER_PORT),
- 0, IN6ADDR_ANY_INIT, 0};
+ if (bind(iface->dhcpv6_event.uloop.fd, (struct sockaddr*)&bind_addr,
+ sizeof(bind_addr)) < 0) {
+ syslog(LOG_ERR, "bind(): %m");
+ ret = -1;
+ goto out;
+ }
+
+ memset(&mreq, 0, sizeof(mreq));
+ inet_pton(AF_INET6, ALL_DHCPV6_RELAYS, &mreq.ipv6mr_multiaddr);
+ mreq.ipv6mr_interface = iface->ifindex;
- if (bind(sock, (struct sockaddr*)&bind_addr, sizeof(bind_addr))) {
- syslog(LOG_ERR, "Failed to open DHCPv6 server socket: %s",
- strerror(errno));
- return -1;
+ if (setsockopt(iface->dhcpv6_event.uloop.fd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP,
+ &mreq, sizeof(mreq)) < 0) {
+ syslog(LOG_ERR, "setsockopt(IPV6_ADD_MEMBERSHIP): %m");
+ ret = -1;
+ goto out;
}
- struct ipv6_mreq relay = {ALL_DHCPV6_RELAYS, iface->ifindex};
- struct ipv6_mreq server = {ALL_DHCPV6_SERVERS, iface->ifindex};
- setsockopt(sock, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &relay, sizeof(relay));
+ if (iface->dhcpv6 == MODE_SERVER) {
+ memset(&mreq, 0, sizeof(mreq));
+ inet_pton(AF_INET6, ALL_DHCPV6_SERVERS, &mreq.ipv6mr_multiaddr);
+ mreq.ipv6mr_interface = iface->ifindex;
- if (iface->dhcpv6 == RELAYD_SERVER)
- setsockopt(sock, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &server, sizeof(server));
+ if (setsockopt(iface->dhcpv6_event.uloop.fd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP,
+ &mreq, sizeof(mreq)) < 0) {
+ syslog(LOG_ERR, "setsockopt(IPV6_ADD_MEMBERSHIP): %m");
+ ret = -1;
+ goto out;
+ }
+ }
- iface->dhcpv6_event.uloop.fd = sock;
iface->dhcpv6_event.handle_dgram = handle_dhcpv6;
odhcpd_register(&iface->dhcpv6_event);
}
- return setup_dhcpv6_ia_interface(iface, enable);
+ ret = dhcpv6_ia_setup_interface(iface, enable);
+
+out:
+ if (ret < 0 && iface->dhcpv6_event.uloop.fd >= 0) {
+ close(iface->dhcpv6_event.uloop.fd);
+ iface->dhcpv6_event.uloop.fd = -1;
+ }
+
+ return ret;
}
enum {
IOV_DEST,
IOV_MAXRT,
#define IOV_STAT IOV_MAXRT
+ IOV_RAPID_COMMIT,
IOV_DNS,
IOV_DNS_ADDR,
IOV_SEARCH,
#define IOV_REFRESH IOV_PDBUF
IOV_CERID,
IOV_DHCPV6_RAW,
+ IOV_NTP,
+ IOV_NTP_ADDR,
+ IOV_SNTP,
+ IOV_SNTP_ADDR,
IOV_RELAY_MSG,
+ IOV_DHCPV4O6_SERVER,
IOV_TOTAL
};
static void handle_nested_message(uint8_t *data, size_t len,
- uint8_t **opts, uint8_t **end, struct iovec iov[IOV_TOTAL - 1])
+ struct dhcpv6_client_header **c_hdr, uint8_t **opts,
+ uint8_t **end, struct iovec iov[IOV_TOTAL])
{
- struct dhcpv6_relay_header *hdr = (struct dhcpv6_relay_header*)data;
+ struct dhcpv6_relay_header *r_hdr = (struct dhcpv6_relay_header *)data;
+ uint16_t otype, olen;
+ uint8_t *odata;
+
if (iov[IOV_NESTED].iov_base == NULL) {
iov[IOV_NESTED].iov_base = data;
iov[IOV_NESTED].iov_len = len;
if (len < sizeof(struct dhcpv6_client_header))
return;
- if (hdr->msg_type != DHCPV6_MSG_RELAY_FORW) {
- iov[IOV_NESTED].iov_len = data - (uint8_t*)iov[IOV_NESTED].iov_base;
- struct dhcpv6_client_header *hdr = (void*)data;
- *opts = (uint8_t*)&hdr[1];
+ if (r_hdr->msg_type != DHCPV6_MSG_RELAY_FORW) {
+ iov[IOV_NESTED].iov_len = data - (uint8_t *)iov[IOV_NESTED].iov_base;
+ *c_hdr = (void *)data;
+ *opts = (uint8_t *)&(*c_hdr)[1];
*end = data + len;
return;
}
- uint16_t otype, olen;
- uint8_t *odata;
- dhcpv6_for_each_option(hdr->options, data + len, otype, olen, odata) {
+ dhcpv6_for_each_option(r_hdr->options, data + len, otype, olen, odata) {
if (otype == DHCPV6_OPT_RELAY_MSG) {
iov[IOV_RELAY_MSG].iov_base = odata + olen;
- iov[IOV_RELAY_MSG].iov_len = (((uint8_t*)iov[IOV_NESTED].iov_base) +
+ iov[IOV_RELAY_MSG].iov_len = (((uint8_t *)iov[IOV_NESTED].iov_base) +
iov[IOV_NESTED].iov_len) - (odata + olen);
- handle_nested_message(odata, olen, opts, end, iov);
+ handle_nested_message(odata, olen, c_hdr, opts, end, iov);
return;
}
}
}
}
-// Simple DHCPv6-server for information requests
+#ifdef DHCPV4_SUPPORT
+
+struct dhcpv4_msg_data {
+ uint8_t *msg;
+ size_t maxsize;
+ ssize_t len;
+};
+
+static int send_reply(_unused const void *buf, size_t len,
+ _unused const struct sockaddr *dest, _unused socklen_t dest_len,
+ _unused void *opaque)
+{
+ struct dhcpv4_msg_data *reply = opaque;
+
+ if (len > reply->maxsize) {
+ syslog(LOG_ERR, "4o6: reply too large, %zu > %zu", len, reply->maxsize);
+ reply->len = -1;
+ } else {
+ memcpy(reply->msg, buf, len);
+ reply->len = len;
+ }
+
+ return reply->len;
+}
+
+static ssize_t dhcpv6_4o6_query(uint8_t *buf, size_t buflen,
+ struct interface *iface,
+ const struct sockaddr_in6 *addr,
+ const void *data, const uint8_t *end)
+{
+ const struct dhcpv6_client_header *hdr = data;
+ uint16_t otype, olen, msgv4_len = 0;
+ uint8_t *msgv4_data = NULL;
+ uint8_t *start = (uint8_t *)&hdr[1], *odata;
+ struct sockaddr_in addrv4;
+ struct dhcpv4_msg_data reply = { .msg = buf, .maxsize = buflen, .len = -1 };
+
+ dhcpv6_for_each_option(start, end, otype, olen, odata) {
+ if (otype == DHCPV6_OPT_DHCPV4_MSG) {
+ msgv4_data = odata;
+ msgv4_len = olen;
+ }
+ }
+
+ if (!msgv4_data || msgv4_len == 0) {
+ syslog(LOG_ERR, "4o6: missing DHCPv4 message option (%d)", DHCPV6_OPT_DHCPV4_MSG);
+ return -1;
+ }
+
+ // Dummy IPv4 address
+ memset(&addrv4, 0, sizeof(addrv4));
+ addrv4.sin_family = AF_INET;
+ addrv4.sin_addr.s_addr = INADDR_ANY;
+ addrv4.sin_port = htons(DHCPV4_CLIENT_PORT);
+
+ dhcpv4_handle_msg(&addrv4, msgv4_data, msgv4_len,
+ iface, NULL, send_reply, &reply);
+
+ return reply.len;
+}
+#endif /* DHCPV4_SUPPORT */
+
+/* Simple DHCPv6-server for information requests */
static void handle_client_request(void *addr, void *data, size_t len,
struct interface *iface, void *dest_addr)
{
struct dhcpv6_client_header *hdr = data;
+ uint8_t *opts = (uint8_t *)&hdr[1], *opts_end = (uint8_t *)data + len;
+ bool o_rapid_commit = false;
if (len < sizeof(*hdr))
return;
- syslog(LOG_NOTICE, "Got DHCPv6 request");
+ syslog(LOG_DEBUG, "Got a DHCPv6-request on %s", iface->name);
- // Construct reply message
+ /* Construct reply message */
struct __attribute__((packed)) {
uint8_t msg_type;
uint8_t tr_id[3];
} maxrt = {htons(DHCPV6_OPT_SOL_MAX_RT), htons(sizeof(maxrt) - 4),
htonl(60)};
+ struct __attribute__((packed)) {
+ uint16_t type;
+ uint16_t len;
+ } rapid_commit = {htons(DHCPV6_OPT_RAPID_COMMIT), 0};
+
struct __attribute__((packed)) {
uint16_t type;
uint16_t len;
size_t dns_cnt = iface->dns_cnt;
if ((dns_cnt == 0) &&
- odhcpd_get_preferred_interface_address(iface->ifindex, &dns_addr)) {
+ !odhcpd_get_interface_dns_addr(iface, &dns_addr)) {
dns_addr_ptr = &dns_addr;
dns_cnt = 1;
}
uint16_t len;
} dns = {htons(DHCPV6_OPT_DNS_SERVERS), htons(dns_cnt * sizeof(*dns_addr_ptr))};
+ /* SNTP */
+ struct in6_addr *sntp_addr_ptr = iface->dhcpv6_sntp;
+ size_t sntp_cnt = 0;
+ struct {
+ uint16_t type;
+ uint16_t len;
+ } dhcpv6_sntp;
+
+ /* NTP */
+ uint8_t *ntp_ptr = iface->dhcpv6_ntp;
+ uint16_t ntp_len = iface->dhcpv6_ntp_len;
+ size_t ntp_cnt = 0;
+
+ struct {
+ uint16_t type;
+ uint16_t len;
+ } ntp;
- // DNS Search options
+ uint16_t otype, olen;
+ uint16_t *reqopts = NULL;
+ uint8_t *odata;
+ size_t reqopts_len = 0;
+
+ dhcpv6_for_each_option(opts, opts_end, otype, olen, odata) {
+ if (otype == DHCPV6_OPT_ORO) {
+ reqopts_len = olen;
+ reqopts = (uint16_t *)odata;
+ }
+ }
+
+ for(size_t opt = 0; opt < reqopts_len/2; opt++) {
+ if (iface->dhcpv6_sntp_cnt != 0 &&
+ DHCPV6_OPT_SNTP_SERVERS == ntohs(reqopts[opt])) {
+ sntp_cnt = iface->dhcpv6_sntp_cnt;
+ dhcpv6_sntp.type = htons(DHCPV6_OPT_SNTP_SERVERS);
+ dhcpv6_sntp.len = htons(sntp_cnt * sizeof(*sntp_addr_ptr));
+ } else if (iface->dhcpv6_ntp_cnt != 0 &&
+ DHCPV6_OPT_NTP_SERVERS == ntohs(reqopts[opt])) {
+ ntp_cnt = iface->dhcpv6_ntp_cnt;
+ ntp.type = htons(DHCPV6_OPT_NTP_SERVERS);
+ ntp.len = htons(ntp_len);
+ }
+ }
+
+ /* DNS Search options */
uint8_t search_buf[256], *search_domain = iface->search;
size_t search_len = iface->search_len;
} search = {htons(DHCPV6_OPT_DNS_DOMAIN), htons(search_len)};
+ struct __attribute__((packed)) dhcpv4o6_server {
+ uint16_t type;
+ uint16_t len;
+ struct in6_addr addr;
+ } dhcpv4o6_server = {htons(DHCPV6_OPT_4O6_SERVER), htons(sizeof(struct in6_addr)),
+ IN6ADDR_ANY_INIT};
+
struct dhcpv6_cer_id cerid = {
#ifdef EXT_CER_ID
.type = htons(EXT_CER_ID),
[IOV_NESTED] = {NULL, 0},
[IOV_DEST] = {&dest, (uint8_t*)&dest.clientid_type - (uint8_t*)&dest},
[IOV_MAXRT] = {&maxrt, sizeof(maxrt)},
+ [IOV_RAPID_COMMIT] = {&rapid_commit, 0},
[IOV_DNS] = {&dns, (dns_cnt) ? sizeof(dns) : 0},
[IOV_DNS_ADDR] = {dns_addr_ptr, dns_cnt * sizeof(*dns_addr_ptr)},
[IOV_SEARCH] = {&search, (search_len) ? sizeof(search) : 0},
[IOV_PDBUF] = {pdbuf, 0},
[IOV_CERID] = {&cerid, 0},
[IOV_DHCPV6_RAW] = {iface->dhcpv6_raw, iface->dhcpv6_raw_len},
- [IOV_RELAY_MSG] = {NULL, 0}
+ [IOV_NTP] = {&ntp, (ntp_cnt) ? sizeof(ntp) : 0},
+ [IOV_NTP_ADDR] = {ntp_ptr, (ntp_cnt) ? ntp_len : 0},
+ [IOV_SNTP] = {&dhcpv6_sntp, (sntp_cnt) ? sizeof(dhcpv6_sntp) : 0},
+ [IOV_SNTP_ADDR] = {sntp_addr_ptr, sntp_cnt * sizeof(*sntp_addr_ptr)},
+ [IOV_RELAY_MSG] = {NULL, 0},
+ [IOV_DHCPV4O6_SERVER] = {&dhcpv4o6_server, 0},
};
- uint8_t *opts = (uint8_t*)&hdr[1], *opts_end = (uint8_t*)data + len;
if (hdr->msg_type == DHCPV6_MSG_RELAY_FORW)
- handle_nested_message(data, len, &opts, &opts_end, iov);
-
- memcpy(dest.tr_id, &opts[-3], sizeof(dest.tr_id));
-
- if (opts[-4] == DHCPV6_MSG_ADVERTISE || opts[-4] == DHCPV6_MSG_REPLY || opts[-4] == DHCPV6_MSG_RELAY_REPL)
- return;
+ handle_nested_message(data, len, &hdr, &opts, &opts_end, iov);
+
+ switch (hdr->msg_type) {
+ case DHCPV6_MSG_SOLICIT:
+ case DHCPV6_MSG_REQUEST:
+ case DHCPV6_MSG_CONFIRM:
+ case DHCPV6_MSG_RENEW:
+ case DHCPV6_MSG_REBIND:
+ case DHCPV6_MSG_RELEASE:
+ case DHCPV6_MSG_DECLINE:
+ case DHCPV6_MSG_INFORMATION_REQUEST:
+ case DHCPV6_MSG_RELAY_FORW:
+#ifdef DHCPV4_SUPPORT
+ case DHCPV6_MSG_DHCPV4_QUERY:
+#endif
+ break; /* Valid message types for clients */
+ case DHCPV6_MSG_ADVERTISE:
+ case DHCPV6_MSG_REPLY:
+ case DHCPV6_MSG_RECONFIGURE:
+ case DHCPV6_MSG_RELAY_REPL:
+ case DHCPV6_MSG_DHCPV4_RESPONSE:
+#ifndef DHCPV4_SUPPORT
+ case DHCPV6_MSG_DHCPV4_QUERY:
+#endif
+ default:
+ return; /* Invalid message types for clients */
+ }
if (!IN6_IS_ADDR_MULTICAST((struct in6_addr *)dest_addr) && iov[IOV_NESTED].iov_len == 0 &&
- (opts[-4] == DHCPV6_MSG_SOLICIT || opts[-4] == DHCPV6_MSG_CONFIRM ||
- opts[-4] == DHCPV6_MSG_REBIND || opts[-4] == DHCPV6_MSG_INFORMATION_REQUEST))
+ (hdr->msg_type == DHCPV6_MSG_SOLICIT || hdr->msg_type == DHCPV6_MSG_CONFIRM ||
+ hdr->msg_type == DHCPV6_MSG_REBIND || hdr->msg_type == DHCPV6_MSG_INFORMATION_REQUEST))
return;
- if (opts[-4] == DHCPV6_MSG_SOLICIT) {
- dest.msg_type = DHCPV6_MSG_ADVERTISE;
- } 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);
- }
+ memcpy(dest.tr_id, hdr->transaction_id, sizeof(dest.tr_id));
- // Go through options and find what we need
- uint16_t otype, olen;
- uint8_t *odata;
+ /* Go through options and find what we need */
dhcpv6_for_each_option(opts, opts_end, otype, olen, odata) {
if (otype == DHCPV6_OPT_CLIENTID && olen <= 130) {
dest.clientid_length = htons(olen);
} else if (otype == DHCPV6_OPT_SERVERID) {
if (olen != ntohs(dest.serverid_length) ||
memcmp(odata, &dest.duid_type, olen))
- return; // Not for us
+ return; /* Not for us */
} else if (iface->filter_class && otype == DHCPV6_OPT_USER_CLASS) {
uint8_t *c = odata, *cend = &odata[olen];
for (; &c[2] <= cend && &c[2 + (c[0] << 8) + c[1]] <= cend; c = &c[2 + (c[0] << 8) + c[1]]) {
size_t elen = strlen(iface->filter_class);
if (((((size_t)c[0]) << 8) | c[1]) == elen && !memcmp(&c[2], iface->filter_class, elen))
- return; // Ignore from homenet
+ return; /* Ignore from homenet */
}
} else if (otype == DHCPV6_OPT_IA_PD) {
#ifdef EXT_CER_ID
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,
- ARRAY_SIZE(addrs));
+ struct odhcpd_ipaddr *addrs;
+ ssize_t len = netlink_get_interface_addrs(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;
+ cerid.addr = addrs[i].addr.in6;
+
+ free(addrs);
}
#endif
+ } else if (otype == DHCPV6_OPT_RAPID_COMMIT && hdr->msg_type == DHCPV6_MSG_SOLICIT) {
+ iov[IOV_RAPID_COMMIT].iov_len = sizeof(rapid_commit);
+ o_rapid_commit = true;
+ } else if (otype == DHCPV6_OPT_ORO) {
+ for (int i=0; i < olen/2; i++) {
+ uint16_t option = ntohs(((uint16_t *)odata)[i]);
+
+ switch (option) {
+#ifdef DHCPV4_SUPPORT
+ case DHCPV6_OPT_4O6_SERVER:
+ if (iface->dhcpv4) {
+ /* According to RFC 7341, 7.2. DHCP 4o6 Server Address Option Format:
+ * This option may also carry no IPv6 addresses, which instructs the
+ * client to use the All_DHCP_Relay_Agents_and_Servers multicast address
+ * as the destination address.
+ *
+ * The ISC dhclient logs a missing IPv6 address as an error but seems to
+ * work anyway:
+ * dhcp4-o-dhcp6-server: expecting at least 16 bytes; got 0
+ *
+ * Include the All_DHCP_Relay_Agents_and_Servers multicast address
+ * to make it explicit which address to use. */
+ struct dhcpv4o6_server *server = iov[IOV_DHCPV4O6_SERVER].iov_base;
+
+ inet_pton(AF_INET6, ALL_DHCPV6_RELAYS, &server->addr);
+
+ iov[IOV_DHCPV4O6_SERVER].iov_len = sizeof(dhcpv4o6_server);
+ }
+ break;
+#endif /* DHCPV4_SUPPORT */
+ default:
+ break;
+ }
+ }
}
}
if (!IN6_IS_ADDR_MULTICAST((struct in6_addr *)dest_addr) && iov[IOV_NESTED].iov_len == 0 &&
- (opts[-4] == DHCPV6_MSG_REQUEST || opts[-4] == DHCPV6_MSG_RENEW ||
- opts[-4] == DHCPV6_MSG_RELEASE || opts[-4] == DHCPV6_MSG_DECLINE)) {
+ (hdr->msg_type == DHCPV6_MSG_REQUEST || hdr->msg_type == DHCPV6_MSG_RENEW ||
+ hdr->msg_type == DHCPV6_MSG_RELEASE || hdr->msg_type == DHCPV6_MSG_DECLINE)) {
iov[IOV_STAT].iov_base = &stat;
iov[IOV_STAT].iov_len = sizeof(stat);
return;
}
- if (opts[-4] != DHCPV6_MSG_INFORMATION_REQUEST) {
- ssize_t ialen = dhcpv6_handle_ia(pdbuf, sizeof(pdbuf), iface, addr, &opts[-4], opts_end);
+ if (hdr->msg_type == DHCPV6_MSG_SOLICIT && !o_rapid_commit) {
+ dest.msg_type = DHCPV6_MSG_ADVERTISE;
+ } else if (hdr->msg_type == 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);
+ }
+
+#ifdef DHCPV4_SUPPORT
+ if (hdr->msg_type == DHCPV6_MSG_DHCPV4_QUERY) {
+ struct _packed dhcpv4_msg_data {
+ uint16_t type;
+ uint16_t len;
+ uint8_t msg[1];
+ } *msg_opt = (struct dhcpv4_msg_data*)pdbuf;
+ ssize_t msglen;
+
+ memset(pdbuf, 0, sizeof(pdbuf));
+
+ msglen = dhcpv6_4o6_query(msg_opt->msg, sizeof(pdbuf) - sizeof(*msg_opt) + 1,
+ iface, addr, (const void *)hdr, opts_end);
+ if (msglen <= 0) {
+ syslog(LOG_ERR, "4o6: query failed");
+ return;
+ }
+
+ msg_opt->type = htons(DHCPV6_OPT_DHCPV4_MSG);
+ msg_opt->len = htons(msglen);
+ iov[IOV_PDBUF].iov_len = sizeof(*msg_opt) - 1 + msglen;
+ dest.msg_type = DHCPV6_MSG_DHCPV4_RESPONSE;
+ } else
+#endif /* DHCPV4_SUPPORT */
+ if (hdr->msg_type != DHCPV6_MSG_INFORMATION_REQUEST) {
+ ssize_t ialen = dhcpv6_ia_handle_IAs(pdbuf, sizeof(pdbuf), iface, addr, (const void *)hdr, opts_end);
+
iov[IOV_PDBUF].iov_len = ialen;
- if (ialen < 0 || (ialen == 0 && (opts[-4] == DHCPV6_MSG_REBIND || opts[-4] == DHCPV6_MSG_CONFIRM)))
+ if (ialen < 0 ||
+ (ialen == 0 && (hdr->msg_type == DHCPV6_MSG_REBIND || hdr->msg_type == DHCPV6_MSG_CONFIRM)))
return;
}
- if (iov[IOV_NESTED].iov_len > 0) // Update length
+ if (iov[IOV_NESTED].iov_len > 0) /* Update length */
update_nested_message(data, len, iov[IOV_DEST].iov_len + iov[IOV_MAXRT].iov_len +
- iov[IOV_DNS].iov_len + iov[IOV_DNS_ADDR].iov_len +
- iov[IOV_SEARCH].iov_len + iov[IOV_SEARCH_DOMAIN].iov_len +
- iov[IOV_PDBUF].iov_len + iov[IOV_CERID].iov_len +
- iov[IOV_DHCPV6_RAW].iov_len - (4 + opts_end - opts));
+ iov[IOV_RAPID_COMMIT].iov_len + iov[IOV_DNS].iov_len +
+ iov[IOV_DNS_ADDR].iov_len + iov[IOV_SEARCH].iov_len +
+ iov[IOV_SEARCH_DOMAIN].iov_len + iov[IOV_PDBUF].iov_len +
+ iov[IOV_DHCPV4O6_SERVER].iov_len +
+ iov[IOV_CERID].iov_len + iov[IOV_DHCPV6_RAW].iov_len +
+ iov[IOV_NTP].iov_len + iov[IOV_NTP_ADDR].iov_len +
+ iov[IOV_SNTP].iov_len + iov[IOV_SNTP_ADDR].iov_len -
+ (4 + opts_end - opts));
+
+ syslog(LOG_DEBUG, "Sending a DHCPv6-%s on %s", iov[IOV_NESTED].iov_len ? "relay-reply" : "reply", iface->name);
odhcpd_send(iface->dhcpv6_event.uloop.fd, addr, iov, ARRAY_SIZE(iov), iface);
}
-// Central DHCPv6-relay handler
+/* Central DHCPv6-relay handler */
static void handle_dhcpv6(void *addr, void *data, size_t len,
struct interface *iface, void *dest_addr)
{
- if (iface->dhcpv6 == RELAYD_SERVER) {
+ if (iface->dhcpv6 == MODE_SERVER) {
handle_client_request(addr, data, len, iface, dest_addr);
- } else if (iface->dhcpv6 == RELAYD_RELAY) {
+ } else if (iface->dhcpv6 == MODE_RELAY) {
if (iface->master)
relay_server_response(data, len);
else
}
-// Relay server response (regular relay server handling)
+/* Relay server response (regular relay server handling) */
static void relay_server_response(uint8_t *data, size_t len)
{
- // Information we need to gather
+ /* Information we need to gather */
uint8_t *payload_data = NULL;
size_t payload_len = 0;
int32_t ifaceidx = 0;
struct sockaddr_in6 target = {AF_INET6, htons(DHCPV6_CLIENT_PORT),
0, IN6ADDR_ANY_INIT, 0};
-
- syslog(LOG_NOTICE, "Got a DHCPv6-reply");
-
int otype, olen;
uint8_t *odata, *end = data + len;
-
- // Relay DHCPv6 reply from server to client
+ /* Relay DHCPv6 reply from server to client */
struct dhcpv6_relay_header *h = (void*)data;
+
+ syslog(LOG_DEBUG, "Got a DHCPv6-relay-reply");
+
if (len < sizeof(*h) || h->msg_type != DHCPV6_MSG_RELAY_REPL)
return;
- memcpy(&target.sin6_addr, &h->peer_address,
- sizeof(struct in6_addr));
+ memcpy(&target.sin6_addr, &h->peer_address, sizeof(struct in6_addr));
- // Go through options and find what we need
+ /* Go through options and find what we need */
dhcpv6_for_each_option(h->options, end, otype, olen, odata) {
if (otype == DHCPV6_OPT_INTERFACE_ID
&& olen == sizeof(ifaceidx)) {
}
}
- // Invalid interface-id or basic payload
+ /* Invalid interface-id or basic payload */
struct interface *iface = odhcpd_get_interface_by_index(ifaceidx);
if (!iface || iface->master || !payload_data || payload_len < 4)
return;
struct in6_addr *dns_ptr = NULL;
size_t dns_count = 0;
- // If the payload is relay-reply we have to send to the server port
+ /* If the payload is relay-reply we have to send to the server port */
if (payload_data[0] == DHCPV6_MSG_RELAY_REPL) {
target.sin6_port = htons(DHCPV6_SERVER_PORT);
- } else { // Go through the payload data
+ } else { /* Go through the payload data */
struct dhcpv6_client_header *h = (void*)payload_data;
end = payload_data + payload_len;
}
}
- // Rewrite DNS servers if requested
+ /* Rewrite DNS servers if requested */
if (iface->always_rewrite_dns && dns_ptr && dns_count > 0) {
if (is_authenticated)
- return; // Impossible to rewrite
+ return; /* Impossible to rewrite */
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_preferred_interface_address(iface->ifindex, &addr) < 1)
- return; // Unable to get interface address
+ if (odhcpd_get_interface_dns_addr(iface, &addr))
+ return; /* Unable to get interface address */
rewrite = &addr;
rewrite_cnt = 1;
}
- // Copy over any other addresses
+ /* Copy over any other addresses */
for (size_t i = 0; i < dns_count; ++i) {
size_t j = (i < rewrite_cnt) ? i : rewrite_cnt - 1;
memcpy(&dns_ptr[i], &rewrite[j], sizeof(*rewrite));
}
struct iovec iov = {payload_data, payload_len};
+
+ syslog(LOG_DEBUG, "Sending a DHCPv6-reply on %s", iface->name);
+
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->addr6_len; i++) {
+ if (iface->addr6[i].valid_lt <= (uint32_t)now)
+ continue;
-// Relay client request (regular DHCPv6-relay)
+ if (iface->addr6[i].preferred_lt > (uint32_t)now) {
+ addr = &iface->addr6[i];
+ break;
+ }
+
+ if (!addr || (iface->addr6[i].valid_lt > addr->valid_lt))
+ addr = &iface->addr6[i];
+ }
+
+ return addr;
+}
+
+/* Relay client request (regular DHCPv6-relay) */
static void relay_client_request(struct sockaddr_in6 *source,
const void *data, size_t len, struct interface *iface)
{
- struct interface *master = odhcpd_get_master_interface();
const struct dhcpv6_relay_header *h = data;
- if (!master || master->dhcpv6 != RELAYD_RELAY ||
- h->msg_type == DHCPV6_MSG_RELAY_REPL ||
- h->msg_type == DHCPV6_MSG_RECONFIGURE ||
- h->msg_type == DHCPV6_MSG_REPLY ||
- h->msg_type == DHCPV6_MSG_ADVERTISE)
- return; // Invalid message types for client
-
- syslog(LOG_NOTICE, "Got a DHCPv6-request");
-
- // Construct our forwarding envelope
+ /* Construct our forwarding envelope */
struct dhcpv6_relay_forward_envelope hdr = {
.msg_type = DHCPV6_MSG_RELAY_FORW,
.hop_count = 0,
.relay_message_type = htons(DHCPV6_OPT_RELAY_MSG),
.relay_message_len = htons(len),
};
+ struct iovec iov[2] = {{&hdr, sizeof(hdr)}, {(void *)data, len}};
+ struct interface *c;
+ struct odhcpd_ipaddr *ip;
+ struct sockaddr_in6 s;
- if (h->msg_type == DHCPV6_MSG_RELAY_FORW) { // handle relay-forward
+ if (h->msg_type == DHCPV6_MSG_RELAY_REPL ||
+ h->msg_type == DHCPV6_MSG_RECONFIGURE ||
+ h->msg_type == DHCPV6_MSG_REPLY ||
+ h->msg_type == DHCPV6_MSG_ADVERTISE)
+ return; /* Invalid message types for client */
+
+ syslog(LOG_DEBUG, "Got a DHCPv6-request on %s", iface->name);
+
+ if (h->msg_type == DHCPV6_MSG_RELAY_FORW) { /* handle relay-forward */
if (h->hop_count >= DHCPV6_HOP_COUNT_LIMIT)
- return; // Invalid hop count
- else
- hdr.hop_count = h->hop_count + 1;
+ return; /* Invalid hop count */
+
+ hdr.hop_count = h->hop_count + 1;
}
- // use memcpy here as the destination fields are unaligned
- uint32_t ifindex = iface->ifindex;
+ /* use memcpy here as the destination fields are unaligned */
memcpy(&hdr.peer_address, &source->sin6_addr, sizeof(struct in6_addr));
- 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) {
- // 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)
- return; // Could not obtain a suitable address
- }
- memcpy(&hdr.link_address, &ip.addr, sizeof(hdr.link_address));
+ memcpy(&hdr.interface_id_data, &iface->ifindex, sizeof(iface->ifindex));
+
+ /* Detect public IP of slave interface to use as link-address */
+ ip = relay_link_address(iface);
+ if (ip)
+ memcpy(&hdr.link_address, &ip->addr.in6, sizeof(hdr.link_address));
+
+ memset(&s, 0, sizeof(s));
+ s.sin6_family = AF_INET6;
+ s.sin6_port = htons(DHCPV6_SERVER_PORT);
+ inet_pton(AF_INET6, ALL_DHCPV6_SERVERS, &s.sin6_addr);
+
+ avl_for_each_element(&interfaces, c, avl) {
+ if (!c->master || c->dhcpv6 != MODE_RELAY)
+ continue;
+
+ 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. */
+ ip = relay_link_address(c);
+ if (!ip)
+ continue; /* Could not obtain a suitable address */
+
+ memcpy(&hdr.link_address, &ip->addr.in6, sizeof(hdr.link_address));
+ ip = NULL;
+ }
- 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);
+ syslog(LOG_DEBUG, "Sending a DHCPv6-relay-forward on %s", c->name);
+
+ odhcpd_send(c->dhcpv6_event.uloop.fd, &s, iov, 2, c);
+ }
}
projects / project / odhcpd.git / blobdiff