treewide: add netlink file

First step in moving netlink code to netlink.c by
moving netlink code from odhcpd.c to netlink.c

Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>

8 files changed, 424 insertions, 376 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0855458..839f47f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -25,7 +25,7 @@ if(${UBUS})
 	set(EXT_LINK ${EXT_LINK} ubus)
 endif(${UBUS})
 
-add_executable(odhcpd src/odhcpd.c src/config.c src/router.c src/dhcpv6.c src/ndp.c src/dhcpv6-ia.c src/dhcpv4.c ${EXT_SRC})
+add_executable(odhcpd src/odhcpd.c src/config.c src/router.c src/dhcpv6.c src/ndp.c src/dhcpv6-ia.c src/dhcpv4.c src/netlink.c ${EXT_SRC})
 target_link_libraries(odhcpd resolv ubox uci ${libnl} ${EXT_LINK})
 
 # Installation
diff --git a/src/config.c b/src/config.c
index 597d5c5..2f51d33 100644
--- a/src/config.c
+++ b/src/config.c
@@ -449,13 +449,13 @@ int config_parse_interface(void *data, size_t len, const char *name, bool overwr
 	}
 
 	if (get_addrs) {
-		ssize_t len = odhcpd_get_interface_addresses(iface->ifindex,
+		ssize_t len = netlink_get_interface_addrs(iface->ifindex,
 						true, &iface->ia_addr);
 
 		if (len > 0)
 			iface->ia_addr_len = len;
 
-		len = odhcpd_get_interface_addresses(iface->ifindex,
+		len = netlink_get_interface_addrs(iface->ifindex,
 						false, &iface->addr4);
 		if (len > 0)
 			iface->addr4_len = len;
diff --git a/src/dhcpv4.c b/src/dhcpv4.c
index bfe70cb..c8be632 100644
--- a/src/dhcpv4.c
+++ b/src/dhcpv4.c
@@ -293,7 +293,7 @@ static void decr_ref_cnt_ip(struct odhcpd_ref_ip **ptr, struct interface *iface)
 	struct odhcpd_ref_ip *ip = *ptr;
 
 	if (--ip->ref_cnt == 0) {
-		odhcpd_setup_addr(&ip->addr, iface, false, false);
+		netlink_setup_addr(&ip->addr, iface, false, false);
 
 		list_del(&ip->head);
 		free(ip);
@@ -373,7 +373,7 @@ void dhcpv4_addr_update(struct interface *iface)
 
 	a = list_first_entry(&iface->dhcpv4_fr_ips, struct odhcpd_ref_ip, head);
 
-	if (odhcpd_setup_addr(&a->addr, iface, false, true)) {
+	if (netlink_setup_addr(&a->addr, iface, false, true)) {
 		syslog(LOG_ERR, "Failed to add ip address");
 		return;
 	}
diff --git a/src/dhcpv6-ia.c b/src/dhcpv6-ia.c
index 1a584c5..6568c69 100644
--- a/src/dhcpv6-ia.c
+++ b/src/dhcpv6-ia.c
@@ -454,7 +454,7 @@ static void apply_lease(struct interface *iface, struct dhcpv6_assignment *a, bo
 		struct in6_addr prefix = addrs[i].addr.in6;
 		prefix.s6_addr32[1] |= htonl(a->assigned);
 		prefix.s6_addr32[2] = prefix.s6_addr32[3] = 0;
-		odhcpd_setup_route(&prefix, (a->managed_size) ? addrs[i].prefix : a->length,
+		netlink_setup_route(&prefix, (a->managed_size) ? addrs[i].prefix : a->length,
 				iface, &a->peer.sin6_addr, 1024, add);
 	}
 }
diff --git a/src/ndp.c b/src/ndp.c
index 22a9106..460d5fc 100644
--- a/src/ndp.c
+++ b/src/ndp.c
@@ -78,7 +78,7 @@ int ndp_init(void)
 {
 	int val = 2;
 
-	rtnl_event.sock = odhcpd_create_nl_socket(NETLINK_ROUTE);
+	rtnl_event.sock = netlink_create_socket(NETLINK_ROUTE);
 	if (!rtnl_event.sock)
 		goto err;
 
@@ -265,9 +265,9 @@ static void ping6(struct in6_addr *addr,
 	inet_ntop(AF_INET6, addr, ipbuf, sizeof(ipbuf));
 	syslog(LOG_NOTICE, "Pinging for %s%%%s", ipbuf, iface->ifname);
 
-	odhcpd_setup_route(addr, 128, iface, NULL, 128, true);
+	netlink_setup_route(addr, 128, iface, NULL, 128, true);
 	odhcpd_send(ping_socket, &dest, &iov, 1, iface);
-	odhcpd_setup_route(addr, 128, iface, NULL, 128, false);
+	netlink_setup_route(addr, 128, iface, NULL, 128, false);
 }
 
 // Handle solicitations
@@ -321,14 +321,14 @@ static void setup_route(struct in6_addr *addr, struct interface *iface, bool add
 			(add) ? "Learned" : "Forgot", ipbuf, iface->ifname);
 
 	if (iface->learn_routes)
-		odhcpd_setup_route(addr, 128, iface, NULL, 1024, add);
+		netlink_setup_route(addr, 128, iface, NULL, 1024, add);
 }
 
 // Check address update
 static void check_addr_updates(struct interface *iface)
 {
 	struct odhcpd_ipaddr *addr = NULL;
-	ssize_t len = odhcpd_get_interface_addresses(iface->ifindex, false, &addr);
+	ssize_t len = netlink_get_interface_addrs(iface->ifindex, false, &addr);
 
 	if (len < 0)
 		return;
@@ -350,7 +350,7 @@ static void check_addr_updates(struct interface *iface)
 static void check_addr6_updates(struct interface *iface)
 {
 	struct odhcpd_ipaddr *addr = NULL;
-	ssize_t len = odhcpd_get_interface_addresses(iface->ifindex, true, &addr);
+	ssize_t len = netlink_get_interface_addrs(iface->ifindex, true, &addr);
 
 	if (len < 0)
 		return;
@@ -390,7 +390,7 @@ static void setup_addr_for_relaying(struct in6_addr *addr, struct interface *ifa
 
 		bool neigh_add = (c->ndp == MODE_RELAY ? add : false);
 
-		if (odhcpd_setup_proxy_neigh(addr, c, neigh_add))
+		if (netlink_setup_proxy_neigh(addr, c, neigh_add))
 			syslog(LOG_DEBUG, "Failed to %s proxy neighbour entry %s%%%s",
 				neigh_add ? "add" : "delete", ipbuf, c->ifname);
 		else
@@ -543,7 +543,7 @@ static int cb_rtnl_valid(struct nl_msg *msg, _unused void *arg)
 		if (ndm->ndm_flags & NTF_PROXY) {
 			/* Dump and flush proxy entries */
 			if (hdr->nlmsg_type == RTM_NEWNEIGH) {
-				odhcpd_setup_proxy_neigh(addr6, iface, false);
+				netlink_setup_proxy_neigh(addr6, iface, false);
 				setup_route(addr6, iface, false);
 				dump_neigh_table(false);
 			}
diff --git a/src/netlink.c b/src/netlink.c
new file mode 100644
index 0000000..485fd57
--- /dev/null
+++ b/src/netlink.c
@@ -0,0 +1,392 @@
+/**
+ * Copyright (C) 2017 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
+ * 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 <errno.h>
+#include <string.h>
+#include <syslog.h>
+
+#include <linux/netlink.h>
+#include <linux/if_addr.h>
+#include <linux/neighbour.h>
+#include <linux/rtnetlink.h>
+
+#include <netlink/msg.h>
+#include <netlink/socket.h>
+#include <netlink/attr.h>
+
+#include "odhcpd.h"
+
+static struct nl_sock *rtnl_socket = NULL;
+
+
+int netlink_init(void)
+{
+	if (!(rtnl_socket = netlink_create_socket(NETLINK_ROUTE))) {
+		syslog(LOG_ERR, "Unable to open nl socket: %s", strerror(errno));
+		return -1;
+	}
+
+	return 0;
+}
+
+
+struct nl_sock *netlink_create_socket(int protocol)
+{
+	struct nl_sock *nl_sock;
+
+	nl_sock = nl_socket_alloc();
+	if (!nl_sock)
+		goto err;
+
+	if (nl_connect(nl_sock, protocol) < 0)
+		goto err;
+
+	return nl_sock;
+
+err:
+	if (nl_sock)
+		nl_socket_free(nl_sock);
+
+	return NULL;
+}
+
+
+struct addr_info {
+	int ifindex;
+	int af;
+	struct odhcpd_ipaddr **addrs;
+	int pending;
+	ssize_t ret;
+};
+
+
+static int cb_valid_handler(struct nl_msg *msg, void *arg)
+{
+	struct addr_info *ctxt = (struct addr_info *)arg;
+	struct odhcpd_ipaddr *addrs = *(ctxt->addrs);
+	struct nlmsghdr *hdr = nlmsg_hdr(msg);
+	struct ifaddrmsg *ifa;
+	struct nlattr *nla[__IFA_MAX], *nla_addr = NULL;
+
+	if (hdr->nlmsg_type != RTM_NEWADDR)
+		return NL_SKIP;
+
+	ifa = NLMSG_DATA(hdr);
+	if (ifa->ifa_scope != RT_SCOPE_UNIVERSE ||
+			(ctxt->af != ifa->ifa_family) ||
+			(ctxt->ifindex && ifa->ifa_index != (unsigned)ctxt->ifindex))
+		return NL_SKIP;
+
+	nlmsg_parse(hdr, sizeof(*ifa), nla, __IFA_MAX - 1, NULL);
+
+	switch (ifa->ifa_family) {
+	case AF_INET6:
+		if (nla[IFA_ADDRESS])
+			nla_addr = nla[IFA_ADDRESS];
+		break;
+
+	case AF_INET:
+		if (nla[IFA_LOCAL])
+			nla_addr = nla[IFA_LOCAL];
+		break;
+
+	default:
+		break;
+	}
+	if (!nla_addr)
+		return NL_SKIP;
+
+	addrs = realloc(addrs, sizeof(*addrs)*(ctxt->ret + 1));
+	if (!addrs)
+		return NL_SKIP;
+
+	memset(&addrs[ctxt->ret], 0, sizeof(addrs[ctxt->ret]));
+	addrs[ctxt->ret].prefix = ifa->ifa_prefixlen;
+
+	nla_memcpy(&addrs[ctxt->ret].addr, nla_addr,
+			sizeof(addrs[ctxt->ret].addr));
+
+	if (nla[IFA_BROADCAST])
+		nla_memcpy(&addrs[ctxt->ret].broadcast, nla[IFA_BROADCAST],
+				sizeof(addrs[ctxt->ret].broadcast));
+
+	if (nla[IFA_CACHEINFO]) {
+		struct ifa_cacheinfo *ifc = nla_data(nla[IFA_CACHEINFO]);
+
+		addrs[ctxt->ret].preferred = ifc->ifa_prefered;
+		addrs[ctxt->ret].valid = ifc->ifa_valid;
+	}
+
+	if (ifa->ifa_flags & IFA_F_DEPRECATED)
+		addrs[ctxt->ret].preferred = 0;
+
+	ctxt->ret++;
+	*(ctxt->addrs) = addrs;
+
+	return NL_OK;
+}
+
+
+static int cb_finish_handler(_unused struct nl_msg *msg, void *arg)
+{
+	struct addr_info *ctxt = (struct addr_info *)arg;
+
+	ctxt->pending = 0;
+
+	return NL_STOP;
+}
+
+
+static int cb_error_handler(_unused struct sockaddr_nl *nla, struct nlmsgerr *err,
+		void *arg)
+{
+	struct addr_info *ctxt = (struct addr_info *)arg;
+
+	ctxt->pending = 0;
+	ctxt->ret = err->error;
+
+	return NL_STOP;
+}
+
+
+static int prefix_cmp(const void *va, const void *vb)
+{
+	const struct odhcpd_ipaddr *a = va, *b = vb;
+	int ret = 0;
+
+	if (a->prefix == b->prefix) {
+		ret = (ntohl(a->addr.in.s_addr) < ntohl(b->addr.in.s_addr)) ? 1 :
+			(ntohl(a->addr.in.s_addr) > ntohl(b->addr.in.s_addr)) ? -1 : 0;
+	} else
+		ret = a->prefix < b->prefix ? 1 : -1;
+
+	return ret;
+}
+
+
+// compare IPv6 prefixes
+static int prefix6_cmp(const void *va, const void *vb)
+{
+	const struct odhcpd_ipaddr *a = va, *b = vb;
+	uint32_t a_pref = IN6_IS_ADDR_ULA(&a->addr.in6) ? 1 : a->preferred;
+	uint32_t b_pref = IN6_IS_ADDR_ULA(&b->addr.in6) ? 1 : b->preferred;
+	return (a_pref < b_pref) ? 1 : (a_pref > b_pref) ? -1 : 0;
+}
+
+
+// Detect an IPV6-address currently assigned to the given interface
+ssize_t netlink_get_interface_addrs(int ifindex, bool v6, struct odhcpd_ipaddr **addrs)
+{
+	struct nl_msg *msg;
+	struct ifaddrmsg ifa = {
+		.ifa_family = v6? AF_INET6: AF_INET,
+		.ifa_prefixlen = 0,
+		.ifa_flags = 0,
+		.ifa_scope = 0,
+		.ifa_index = ifindex, };
+	struct nl_cb *cb = nl_cb_alloc(NL_CB_DEFAULT);
+	struct addr_info ctxt = {
+		.ifindex = ifindex,
+		.af = v6? AF_INET6: AF_INET,
+		.addrs = addrs,
+		.ret = 0,
+		.pending = 1,
+	};
+
+	if (!cb) {
+		ctxt.ret = -1;
+		goto out;
+	}
+
+	msg = nlmsg_alloc_simple(RTM_GETADDR, NLM_F_REQUEST | NLM_F_DUMP);
+
+	if (!msg) {
+		ctxt.ret = - 1;
+		goto out;
+	}
+
+	nlmsg_append(msg, &ifa, sizeof(ifa), 0);
+
+	nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, cb_valid_handler, &ctxt);
+	nl_cb_set(cb, NL_CB_FINISH, NL_CB_CUSTOM, cb_finish_handler, &ctxt);
+	nl_cb_err(cb, NL_CB_CUSTOM, cb_error_handler, &ctxt);
+
+	nl_send_auto_complete(rtnl_socket, msg);
+	while (ctxt.pending > 0)
+		nl_recvmsgs(rtnl_socket, cb);
+
+	nlmsg_free(msg);
+
+	if (ctxt.ret <= 0)
+		goto out;
+
+	time_t now = odhcpd_time();
+	struct odhcpd_ipaddr *addr = *addrs;
+
+	qsort(addr, ctxt.ret, sizeof(*addr), v6 ? prefix6_cmp : prefix_cmp);
+
+	for (ssize_t i = 0; i < ctxt.ret; ++i) {
+		if (addr[i].preferred < UINT32_MAX - now)
+			addr[i].preferred += now;
+
+		if (addr[i].valid < UINT32_MAX - now)
+			addr[i].valid += now;
+	}
+
+out:
+	nl_cb_put(cb);
+
+	return ctxt.ret;
+}
+
+
+int netlink_setup_route(const struct in6_addr *addr, const int prefixlen,
+		const struct interface *iface, const struct in6_addr *gw,
+		const uint32_t metric, const bool add)
+{
+	struct nl_msg *msg;
+	struct rtmsg rtm = {
+		.rtm_family = AF_INET6,
+		.rtm_dst_len = prefixlen,
+		.rtm_src_len = 0,
+		.rtm_table = RT_TABLE_MAIN,
+		.rtm_protocol = (add ? RTPROT_STATIC : RTPROT_UNSPEC),
+		.rtm_scope = (add ? (gw ? RT_SCOPE_UNIVERSE : RT_SCOPE_LINK) : RT_SCOPE_NOWHERE),
+		.rtm_type = (add ? RTN_UNICAST : RTN_UNSPEC),
+	};
+	int ret = 0;
+
+	msg = nlmsg_alloc_simple(add ? RTM_NEWROUTE : RTM_DELROUTE,
+					add ? NLM_F_CREATE | NLM_F_REPLACE : 0);
+	if (!msg)
+		return -1;
+
+	nlmsg_append(msg, &rtm, sizeof(rtm), 0);
+
+	nla_put(msg, RTA_DST, sizeof(*addr), addr);
+	nla_put_u32(msg, RTA_OIF, iface->ifindex);
+	nla_put_u32(msg, RTA_PRIORITY, metric);
+
+	if (gw)
+		nla_put(msg, RTA_GATEWAY, sizeof(*gw), gw);
+
+	ret = nl_send_auto_complete(rtnl_socket, msg);
+	nlmsg_free(msg);
+
+	if (ret < 0)
+		return ret;
+
+	return nl_wait_for_ack(rtnl_socket);
+}
+
+
+int netlink_setup_proxy_neigh(const struct in6_addr *addr,
+		const struct interface *iface, const bool add)
+{
+	struct nl_msg *msg;
+	struct ndmsg ndm = {
+		.ndm_family = AF_INET6,
+		.ndm_flags = NTF_PROXY,
+		.ndm_ifindex = iface->ifindex,
+	};
+	int ret = 0, flags = NLM_F_REQUEST;
+
+	if (add)
+		flags |= NLM_F_REPLACE | NLM_F_CREATE;
+
+	msg = nlmsg_alloc_simple(add ? RTM_NEWNEIGH : RTM_DELNEIGH, flags);
+	if (!msg)
+		return -1;
+
+	nlmsg_append(msg, &ndm, sizeof(ndm), 0);
+
+	nla_put(msg, NDA_DST, sizeof(*addr), addr);
+
+	ret = nl_send_auto_complete(rtnl_socket, msg);
+	nlmsg_free(msg);
+
+	if (ret < 0)
+		return ret;
+
+	return nl_wait_for_ack(rtnl_socket);
+}
+
+
+int netlink_setup_addr(struct odhcpd_ipaddr *addr,
+		const struct interface *iface, const bool v6,
+		const bool add)
+{
+	struct nl_msg *msg;
+	struct ifaddrmsg ifa = {
+		.ifa_family = v6 ? AF_INET6 : AF_INET,
+		.ifa_prefixlen = addr->prefix,
+		.ifa_flags = 0,
+		.ifa_scope = 0,
+		.ifa_index = iface->ifindex, };
+	int ret = 0, flags = NLM_F_REQUEST;
+
+	if (add)
+		flags |= NLM_F_REPLACE | NLM_F_CREATE;
+
+	msg = nlmsg_alloc_simple(add ? RTM_NEWADDR : RTM_DELADDR, 0);
+	if (!msg)
+		return -1;
+
+	nlmsg_append(msg, &ifa, sizeof(ifa), flags);
+	nla_put(msg, IFA_LOCAL, v6 ? 16 : 4, &addr->addr);
+	if (v6) {
+		struct ifa_cacheinfo cinfo = {	.ifa_prefered = 0xffffffffU,
+						.ifa_valid = 0xffffffffU,
+						.cstamp = 0,
+						.tstamp = 0 };
+		time_t now = odhcpd_time();
+
+		if (addr->preferred) {
+			int64_t preferred = addr->preferred - now;
+			if (preferred < 0)
+				preferred = 0;
+			else if (preferred > UINT32_MAX)
+				preferred = UINT32_MAX;
+
+			cinfo.ifa_prefered = preferred;
+		}
+
+		if (addr->valid) {
+			int64_t valid = addr->valid - now;
+			if (valid <= 0) {
+				nlmsg_free(msg);
+				return -1;
+			}
+			else if (valid > UINT32_MAX)
+				valid = UINT32_MAX;
+
+			cinfo.ifa_valid = valid;
+		}
+
+		nla_put(msg, IFA_CACHEINFO, sizeof(cinfo), &cinfo);
+
+		nla_put_u32(msg, IFA_FLAGS, IFA_F_NOPREFIXROUTE);
+	} else {
+		if (addr->broadcast.s_addr)
+			nla_put_u32(msg, IFA_BROADCAST, addr->broadcast.s_addr);
+	}
+
+	ret = nl_send_auto_complete(rtnl_socket, msg);
+	nlmsg_free(msg);
+
+	if (ret < 0)
+		return ret;
+
+	return nl_wait_for_ack(rtnl_socket);
+}
diff --git a/src/odhcpd.c b/src/odhcpd.c
index 259b623..5f87151 100644
--- a/src/odhcpd.c
+++ b/src/odhcpd.c
@@ -32,9 +32,6 @@
 #include <netinet/ip6.h>
 #include <netpacket/packet.h>
 #include <linux/netlink.h>
-#include <linux/if_addr.h>
-#include <linux/neighbour.h>
-#include <linux/rtnetlink.h>
 
 #include <sys/socket.h>
 #include <sys/ioctl.h>
@@ -43,16 +40,12 @@
 #include <sys/wait.h>
 #include <sys/syscall.h>
 
-#include <netlink/msg.h>
-#include <netlink/socket.h>
-#include <netlink/attr.h>
 #include <libubox/uloop.h>
 #include "odhcpd.h"
 
 
 
 static int ioctl_sock;
-static struct nl_sock *rtnl_socket = NULL;
 static int urandom_fd = -1;
 
 static void sighandler(_unused int signal)
@@ -60,6 +53,7 @@ static void sighandler(_unused int signal)
 	uloop_end();
 }
 
+
 static void print_usage(const char *app)
 {
 	printf(
@@ -70,6 +64,7 @@ static void print_usage(const char *app)
 	);
 }
 
+
 int main(int argc, char **argv)
 {
 	openlog("odhcpd", LOG_PERROR | LOG_PID, LOG_DAEMON);
@@ -96,11 +91,6 @@ int main(int argc, char **argv)
 
 	ioctl_sock = socket(AF_INET, SOCK_DGRAM | SOCK_CLOEXEC, 0);
 
-	if (!(rtnl_socket = odhcpd_create_nl_socket(NETLINK_ROUTE))) {
-		syslog(LOG_ERR, "Unable to open nl socket: %s", strerror(errno));
-		return 2;
-	}
-
 	if ((urandom_fd = open("/dev/urandom", O_RDONLY | O_CLOEXEC)) < 0)
 		return 4;
 
@@ -108,6 +98,9 @@ int main(int argc, char **argv)
 	signal(SIGINT, sighandler);
 	signal(SIGTERM, sighandler);
 
+	if (netlink_init())
+		return 4;
+
 	if (router_init())
 		return 4;
 
@@ -124,26 +117,6 @@ int main(int argc, char **argv)
 	return 0;
 }
 
-struct nl_sock *odhcpd_create_nl_socket(int protocol)
-{
-	struct nl_sock *nl_sock;
-
-	nl_sock = nl_socket_alloc();
-	if (!nl_sock)
-		goto err;
-
-	if (nl_connect(nl_sock, protocol) < 0)
-		goto err;
-
-	return nl_sock;
-
-err:
-	if (nl_sock)
-		nl_socket_free(nl_sock);
-
-	return NULL;
-}
-
 
 // Read IPv6 MTU for interface
 int odhcpd_get_interface_config(const char *ifname, const char *what)
@@ -220,187 +193,6 @@ ssize_t odhcpd_send(int socket, struct sockaddr_in6 *dest,
 	return sent;
 }
 
-struct addr_info {
-	int ifindex;
-	int af;
-	struct odhcpd_ipaddr **addrs;
-	int pending;
-	ssize_t ret;
-};
-
-static int cb_valid_handler(struct nl_msg *msg, void *arg)
-{
-	struct addr_info *ctxt = (struct addr_info *)arg;
-	struct odhcpd_ipaddr *addrs = *(ctxt->addrs);
-	struct nlmsghdr *hdr = nlmsg_hdr(msg);
-	struct ifaddrmsg *ifa;
-	struct nlattr *nla[__IFA_MAX], *nla_addr = NULL;
-
-	if (hdr->nlmsg_type != RTM_NEWADDR)
-		return NL_SKIP;
-
-	ifa = NLMSG_DATA(hdr);
-	if (ifa->ifa_scope != RT_SCOPE_UNIVERSE ||
-			(ctxt->af != ifa->ifa_family) ||
-			(ctxt->ifindex && ifa->ifa_index != (unsigned)ctxt->ifindex))
-		return NL_SKIP;
-
-	nlmsg_parse(hdr, sizeof(*ifa), nla, __IFA_MAX - 1, NULL);
-
-	switch (ifa->ifa_family) {
-	case AF_INET6:
-		if (nla[IFA_ADDRESS])
-			nla_addr = nla[IFA_ADDRESS];
-		break;
-
-	case AF_INET:
-		if (nla[IFA_LOCAL])
-			nla_addr = nla[IFA_LOCAL];
-		break;
-
-	default:
-		break;
-	}
-	if (!nla_addr)
-		return NL_SKIP;
-
-	addrs = realloc(addrs, sizeof(*addrs)*(ctxt->ret + 1));
-	if (!addrs)
-		return NL_SKIP;
-
-	memset(&addrs[ctxt->ret], 0, sizeof(addrs[ctxt->ret]));
-	addrs[ctxt->ret].prefix = ifa->ifa_prefixlen;
-
-	nla_memcpy(&addrs[ctxt->ret].addr, nla_addr,
-			sizeof(addrs[ctxt->ret].addr));
-
-	if (nla[IFA_BROADCAST])
-		nla_memcpy(&addrs[ctxt->ret].broadcast, nla[IFA_BROADCAST],
-				sizeof(addrs[ctxt->ret].broadcast));
-
-	if (nla[IFA_CACHEINFO]) {
-		struct ifa_cacheinfo *ifc = nla_data(nla[IFA_CACHEINFO]);
-
-		addrs[ctxt->ret].preferred = ifc->ifa_prefered;
-		addrs[ctxt->ret].valid = ifc->ifa_valid;
-	}
-
-	if (ifa->ifa_flags & IFA_F_DEPRECATED)
-		addrs[ctxt->ret].preferred = 0;
-
-	ctxt->ret++;
-	*(ctxt->addrs) = addrs;
-
-	return NL_OK;
-}
-
-static int cb_finish_handler(_unused struct nl_msg *msg, void *arg)
-{
-	struct addr_info *ctxt = (struct addr_info *)arg;
-
-	ctxt->pending = 0;
-
-	return NL_STOP;
-}
-
-static int cb_error_handler(_unused struct sockaddr_nl *nla, struct nlmsgerr *err,
-		void *arg)
-{
-	struct addr_info *ctxt = (struct addr_info *)arg;
-
-	ctxt->pending = 0;
-	ctxt->ret = err->error;
-
-	return NL_STOP;
-}
-
-static int prefix_cmp(const void *va, const void *vb)
-{
-	const struct odhcpd_ipaddr *a = va, *b = vb;
-	int ret = 0;
-
-	if (a->prefix == b->prefix) {
-		ret = (ntohl(a->addr.in.s_addr) < ntohl(b->addr.in.s_addr)) ? 1 :
-			(ntohl(a->addr.in.s_addr) > ntohl(b->addr.in.s_addr)) ? -1 : 0;
-	} else
-		ret = a->prefix < b->prefix ? 1 : -1;
-
-	return ret;
-}
-
-// compare IPv6 prefixes
-static int prefix6_cmp(const void *va, const void *vb)
-{
-	const struct odhcpd_ipaddr *a = va, *b = vb;
-	uint32_t a_pref = IN6_IS_ADDR_ULA(&a->addr.in6) ? 1 : a->preferred;
-	uint32_t b_pref = IN6_IS_ADDR_ULA(&b->addr.in6) ? 1 : b->preferred;
-	return (a_pref < b_pref) ? 1 : (a_pref > b_pref) ? -1 : 0;
-}
-
-// Detect an IPV6-address currently assigned to the given interface
-ssize_t odhcpd_get_interface_addresses(int ifindex, bool v6, struct odhcpd_ipaddr **addrs)
-{
-	struct nl_msg *msg;
-	struct ifaddrmsg ifa = {
-		.ifa_family = v6? AF_INET6: AF_INET,
-		.ifa_prefixlen = 0,
-		.ifa_flags = 0,
-		.ifa_scope = 0,
-		.ifa_index = ifindex, };
-	struct nl_cb *cb = nl_cb_alloc(NL_CB_DEFAULT);
-	struct addr_info ctxt = {
-		.ifindex = ifindex,
-		.af = v6? AF_INET6: AF_INET,
-		.addrs = addrs,
-		.ret = 0,
-		.pending = 1,
-	};
-
-	if (!cb) {
-		ctxt.ret = -1;
-		goto out;
-	}
-
-	msg = nlmsg_alloc_simple(RTM_GETADDR, NLM_F_REQUEST | NLM_F_DUMP);
-
-	if (!msg) {
-		ctxt.ret = - 1;
-		goto out;
-	}
-
-	nlmsg_append(msg, &ifa, sizeof(ifa), 0);
-
-	nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, cb_valid_handler, &ctxt);
-	nl_cb_set(cb, NL_CB_FINISH, NL_CB_CUSTOM, cb_finish_handler, &ctxt);
-	nl_cb_err(cb, NL_CB_CUSTOM, cb_error_handler, &ctxt);
-
-	nl_send_auto_complete(rtnl_socket, msg);
-	while (ctxt.pending > 0)
-		nl_recvmsgs(rtnl_socket, cb);
-
-	nlmsg_free(msg);
-
-	if (ctxt.ret <= 0)
-		goto out;
-
-	time_t now = odhcpd_time();
-	struct odhcpd_ipaddr *addr = *addrs;
-
-	qsort(addr, ctxt.ret, sizeof(*addr), v6 ? prefix6_cmp : prefix_cmp);
-
-	for (ssize_t i = 0; i < ctxt.ret; ++i) {
-		if (addr[i].preferred < UINT32_MAX - now)
-			addr[i].preferred += now;
-
-		if (addr[i].valid < UINT32_MAX - now)
-			addr[i].valid += now;
-	}
-
-out:
-	nl_cb_put(cb);
-
-	return ctxt.ret;
-}
 
 static int odhcpd_get_linklocal_interface_address(int ifindex, struct in6_addr *lladdr)
 {
@@ -465,144 +257,6 @@ int odhcpd_get_interface_dns_addr(const struct interface *iface, struct in6_addr
 	return odhcpd_get_linklocal_interface_address(iface->ifindex, addr);
 }
 
-int odhcpd_setup_route(const struct in6_addr *addr, const int prefixlen,
-		const struct interface *iface, const struct in6_addr *gw,
-		const uint32_t metric, const bool add)
-{
-	struct nl_msg *msg;
-	struct rtmsg rtm = {
-		.rtm_family = AF_INET6,
-		.rtm_dst_len = prefixlen,
-		.rtm_src_len = 0,
-		.rtm_table = RT_TABLE_MAIN,
-		.rtm_protocol = (add ? RTPROT_STATIC : RTPROT_UNSPEC),
-		.rtm_scope = (add ? (gw ? RT_SCOPE_UNIVERSE : RT_SCOPE_LINK) : RT_SCOPE_NOWHERE),
-		.rtm_type = (add ? RTN_UNICAST : RTN_UNSPEC),
-	};
-	int ret = 0;
-
-	msg = nlmsg_alloc_simple(add ? RTM_NEWROUTE : RTM_DELROUTE,
-					add ? NLM_F_CREATE | NLM_F_REPLACE : 0);
-	if (!msg)
-		return -1;
-
-	nlmsg_append(msg, &rtm, sizeof(rtm), 0);
-
-	nla_put(msg, RTA_DST, sizeof(*addr), addr);
-	nla_put_u32(msg, RTA_OIF, iface->ifindex);
-	nla_put_u32(msg, RTA_PRIORITY, metric);
-
-	if (gw)
-		nla_put(msg, RTA_GATEWAY, sizeof(*gw), gw);
-
-	ret = nl_send_auto_complete(rtnl_socket, msg);
-	nlmsg_free(msg);
-
-	if (ret < 0)
-		return ret;
-
-	return nl_wait_for_ack(rtnl_socket);
-}
-
-int odhcpd_setup_proxy_neigh(const struct in6_addr *addr,
-		const struct interface *iface, const bool add)
-{
-	struct nl_msg *msg;
-	struct ndmsg ndm = {
-		.ndm_family = AF_INET6,
-		.ndm_flags = NTF_PROXY,
-		.ndm_ifindex = iface->ifindex,
-	};
-	int ret = 0, flags = NLM_F_REQUEST;
-
-	if (add)
-		flags |= NLM_F_REPLACE | NLM_F_CREATE;
-
-	msg = nlmsg_alloc_simple(add ? RTM_NEWNEIGH : RTM_DELNEIGH, flags);
-	if (!msg)
-		return -1;
-
-	nlmsg_append(msg, &ndm, sizeof(ndm), 0);
-
-	nla_put(msg, NDA_DST, sizeof(*addr), addr);
-
-	ret = nl_send_auto_complete(rtnl_socket, msg);
-	nlmsg_free(msg);
-
-	if (ret < 0)
-		return ret;
-
-	return nl_wait_for_ack(rtnl_socket);
-}
-
-int odhcpd_setup_addr(struct odhcpd_ipaddr *addr,
-		const struct interface *iface, const bool v6,
-		const bool add)
-{
-	struct nl_msg *msg;
-	struct ifaddrmsg ifa = {
-		.ifa_family = v6 ? AF_INET6 : AF_INET,
-		.ifa_prefixlen = addr->prefix,
-		.ifa_flags = 0,
-		.ifa_scope = 0,
-		.ifa_index = iface->ifindex, };
-	int ret = 0, flags = NLM_F_REQUEST;
-
-	if (add)
-		flags |= NLM_F_REPLACE | NLM_F_CREATE;
-
-	msg = nlmsg_alloc_simple(add ? RTM_NEWADDR : RTM_DELADDR, 0);
-	if (!msg)
-		return -1;
-
-	nlmsg_append(msg, &ifa, sizeof(ifa), flags);
-	nla_put(msg, IFA_LOCAL, v6 ? 16 : 4, &addr->addr);
-	if (v6) {
-		struct ifa_cacheinfo cinfo = {	.ifa_prefered = 0xffffffffU,
-						.ifa_valid = 0xffffffffU,
-						.cstamp = 0,
-						.tstamp = 0 };
-		time_t now = odhcpd_time();
-
-		if (addr->preferred) {
-			int64_t preferred = addr->preferred - now;
-			if (preferred < 0)
-				preferred = 0;
-			else if (preferred > UINT32_MAX)
-				preferred = UINT32_MAX;
-
-			cinfo.ifa_prefered = preferred;
-		}
-
-		if (addr->valid) {
-			int64_t valid = addr->valid - now;
-			if (valid <= 0) {
-				nlmsg_free(msg);
-				return -1;
-			}
-			else if (valid > UINT32_MAX)
-				valid = UINT32_MAX;
-
-			cinfo.ifa_valid = valid;
-		}
-
-		nla_put(msg, IFA_CACHEINFO, sizeof(cinfo), &cinfo);
-
-		nla_put_u32(msg, IFA_FLAGS, IFA_F_NOPREFIXROUTE);
-	} else {
-		if (addr->broadcast.s_addr)
-			nla_put_u32(msg, IFA_BROADCAST, addr->broadcast.s_addr);
-	}
-
-	ret = nl_send_auto_complete(rtnl_socket, msg);
-	nlmsg_free(msg);
-
-	if (ret < 0)
-		return ret;
-
-	return nl_wait_for_ack(rtnl_socket);
-}
-
 struct interface* odhcpd_get_interface_by_index(int ifindex)
 {
 	struct interface *iface;
diff --git a/src/odhcpd.h b/src/odhcpd.h
index 2d9e474..0ae36c3 100644
--- a/src/odhcpd.h
+++ b/src/odhcpd.h
@@ -226,12 +226,9 @@ int odhcpd_register(struct odhcpd_event *event);
 int odhcpd_deregister(struct odhcpd_event *event);
 void odhcpd_process(struct odhcpd_event *event);
 
-struct nl_sock *odhcpd_create_nl_socket(int protocol);
 ssize_t odhcpd_send(int socket, struct sockaddr_in6 *dest,
 		struct iovec *iov, size_t iov_len,
 		const struct interface *iface);
-ssize_t odhcpd_get_interface_addresses(int ifindex, bool v6,
-		struct odhcpd_ipaddr **addrs);
 int odhcpd_get_interface_dns_addr(const struct interface *iface,
 		struct in6_addr *addr);
 struct interface* odhcpd_get_interface_by_name(const char *name);
@@ -240,14 +237,6 @@ int odhcpd_get_mac(const struct interface *iface, uint8_t mac[6]);
 struct interface* odhcpd_get_interface_by_index(int ifindex);
 struct interface* odhcpd_get_master_interface(void);
 int odhcpd_urandom(void *data, size_t len);
-int odhcpd_setup_route(const struct in6_addr *addr, const int prefixlen,
-		const struct interface *iface, const struct in6_addr *gw,
-		const uint32_t metric, const bool add);
-int odhcpd_setup_proxy_neigh(const struct in6_addr *addr,
-		const struct interface *iface, const bool add);
-int odhcpd_setup_addr(struct odhcpd_ipaddr *addr,
-		const struct interface *iface, const bool v6,
-		const bool add);
 
 void odhcpd_run(void);
 time_t odhcpd_time(void);
@@ -271,8 +260,21 @@ void ubus_apply_network(void);
 bool ubus_has_prefix(const char *name, const char *ifname);
 #endif
 
+struct nl_sock *netlink_create_socket(int protocol);
+ssize_t netlink_get_interface_addrs(int ifindex, bool v6,
+		struct odhcpd_ipaddr **addrs);
+int netlink_setup_route(const struct in6_addr *addr, const int prefixlen,
+		const struct interface *iface, const struct in6_addr *gw,
+		const uint32_t metric, const bool add);
+int netlink_setup_proxy_neigh(const struct in6_addr *addr,
+		const struct interface *iface, const bool add);
+int netlink_setup_addr(struct odhcpd_ipaddr *addr,
+		const struct interface *iface, const bool v6,
+		const bool add);
+
 
 // Exported module initializers
+int netlink_init(void);
 int router_init(void);
 int dhcpv6_init(void);
 int dhcpv4_init(void);