/**
* 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 <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);
/* Create socket and register events */
int dhcpv6_init(void)
{
- dhcpv6_ia_init();
- return 0;
+ return dhcpv6_ia_init();
}
int dhcpv6_setup_interface(struct interface *iface, bool enable)
{
int ret = 0;
- if (iface->dhcpv6_event.uloop.fd > 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) {
+ if (enable) {
struct sockaddr_in6 bind_addr = {AF_INET6, htons(DHCPV6_SERVER_PORT),
0, IN6ADDR_ANY_INIT, 0};
struct ipv6_mreq mreq;
odhcpd_register(&iface->dhcpv6_event);
}
- ret = dhcpv6_setup_ia_interface(iface, enable);
+ ret = dhcpv6_ia_setup_interface(iface, enable);
out:
- if (ret < 0 && iface->dhcpv6_event.uloop.fd > 0) {
+ if (ret < 0 && iface->dhcpv6_event.uloop.fd >= 0) {
close(iface->dhcpv6_event.uloop.fd);
iface->dhcpv6_event.uloop.fd = -1;
}
IOV_DEST,
IOV_MAXRT,
#define IOV_STAT IOV_MAXRT
+ IOV_RAPID_COMMIT,
IOV_DNS,
IOV_DNS_ADDR,
IOV_SEARCH,
IOV_CERID,
IOV_DHCPV6_RAW,
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])
+ 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;
}
}
}
}
+#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, %u > %u", 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 */
struct __attribute__((packed)) {
} 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;
} search = {htons(DHCPV6_OPT_DNS_DOMAIN), htons(search_len)};
+ struct __attribute__((packed)) {
+ uint16_t type;
+ uint16_t len;
+ } dhcpv4o6_server = {htons(DHCPV6_OPT_4O6_SERVER), 0};
+
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_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;
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)
+ 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 */
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 -
+ (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);
}
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 */
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 */
dhcpv6_for_each_option(h->options, end, otype, olen, odata) {
if (rewrite_cnt == 0) {
if (odhcpd_get_interface_dns_addr(iface, &addr))
- return; // Unable to get interface address
+ return; /* Unable to get interface address */
rewrite = &addr;
rewrite_cnt = 1;
}
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 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;
- struct sockaddr_in6 s;
-
- if (!master || master->dhcpv6 != MODE_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 */
struct dhcpv6_relay_forward_envelope hdr = {
.msg_type = DHCPV6_MSG_RELAY_FORW,
.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_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;
memcpy(&hdr.peer_address, &source->sin6_addr, sizeof(struct in6_addr));
- memcpy(&hdr.interface_id_data, &ifindex, sizeof(ifindex));
+ memcpy(&hdr.interface_id_data, &iface->ifindex, sizeof(iface->ifindex));
/* Detect public IP of slave interface to use as link-address */
- 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. */
- ip = relay_link_address(master);
- if (!ip)
- return; /* Could not obtain a suitable address */
- }
-
- memcpy(&hdr.link_address, &ip->addr.in6, sizeof(hdr.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);
- struct iovec iov[2] = {{&hdr, sizeof(hdr)}, {(void*)data, len}};
- odhcpd_send(master->dhcpv6_event.uloop.fd, &s, iov, 2, master);
+ 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;
+ }
+
+ syslog(LOG_DEBUG, "Sending a DHCPv6-relay-forward on %s", c->name);
+
+ odhcpd_send(c->dhcpv6_event.uloop.fd, &s, iov, 2, c);
+ }
}
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