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>

1 files changed, 5 insertions, 351 deletions

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;