ip route: Remove rtnl_rtcache_request

Add a filter option to rtnl_routedump_req and use it to set rtm_flags
removing the need for rtnl_rtcache_request for dump requests.

Signed-off-by: David Ahern <dsahern@gmail.com>

include/libnetlink.h

@@ -47,11 +47,14 @@ int rtnl_open_byproto(struct rtnl_handle *rth, unsigned int subscriptions,
 
 void rtnl_close(struct rtnl_handle *rth);
 
+typedef int (*req_filter_fn_t)(struct nlmsghdr *nlh, int reqlen);
+
 int rtnl_addrdump_req(struct rtnl_handle *rth, int family)
 	__attribute__((warn_unused_result));
 int rtnl_addrlbldump_req(struct rtnl_handle *rth, int family)
 	__attribute__((warn_unused_result));
-int rtnl_routedump_req(struct rtnl_handle *rth, int family)
+int rtnl_routedump_req(struct rtnl_handle *rth, int family,
+		       req_filter_fn_t filter_fn)
 	__attribute__((warn_unused_result));
 int rtnl_ruledump_req(struct rtnl_handle *rth, int family)
 	__attribute__((warn_unused_result));
@@ -71,8 +74,6 @@ int rtnl_linkdump_req(struct rtnl_handle *rth, int fam)
 int rtnl_linkdump_req_filter(struct rtnl_handle *rth, int fam, __u32 filt_mask)
 	__attribute__((warn_unused_result));
 
-typedef int (*req_filter_fn_t)(struct nlmsghdr *nlh, int reqlen);
-
 int rtnl_linkdump_req_filter_fn(struct rtnl_handle *rth, int fam,
 				req_filter_fn_t fn)
 	__attribute__((warn_unused_result));

ip/ipmroute.c

@@ -283,7 +283,7 @@ static int mroute_list(int argc, char **argv)
 		filter.iif = idx;
 	}
 
-	if (rtnl_routedump_req(&rth, filter.af) < 0) {
+	if (rtnl_routedump_req(&rth, filter.af, NULL) < 0) {
 		perror("Cannot send dump request");
 		return 1;
 	}

ip/iproute.c

@@ -1535,24 +1535,6 @@ static int iproute_modify(int cmd, unsigned int flags, int argc, char **argv)
 	return 0;
 }
 
-static int rtnl_rtcache_request(struct rtnl_handle *rth, int family)
-{
-	struct {
-		struct nlmsghdr nlh;
-		struct rtmsg rtm;
-	} req = {
-		.nlh.nlmsg_len = sizeof(req),
-		.nlh.nlmsg_type = RTM_GETROUTE,
-		.nlh.nlmsg_flags = NLM_F_ROOT | NLM_F_REQUEST,
-		.nlh.nlmsg_seq = rth->dump = ++rth->seq,
-		.rtm.rtm_family = family,
-		.rtm.rtm_flags = RTM_F_CLONED,
-	};
-	struct sockaddr_nl nladdr = { .nl_family = AF_NETLINK };
-
-	return sendto(rth->fd, (void *)&req, sizeof(req), 0, (struct sockaddr *)&nladdr, sizeof(nladdr));
-}
-
 static int iproute_flush_cache(void)
 {
 #define ROUTE_FLUSH_PATH "/proc/sys/net/ipv4/route/flush"
@@ -1644,7 +1626,7 @@ static int iproute_flush(int do_ipv6, rtnl_filter_t filter_fn)
 	filter.flushe = sizeof(flushb);
 
 	for (;;) {
-		if (rtnl_routedump_req(&rth, do_ipv6) < 0) {
+		if (rtnl_routedump_req(&rth, do_ipv6, NULL) < 0) {
 			perror("Cannot send dump request");
 			return -2;
 		}
@@ -1684,6 +1666,16 @@ static int iproute_flush(int do_ipv6, rtnl_filter_t filter_fn)
 	}
 }
 
+static int iproute_dump_filter(struct nlmsghdr *nlh, int reqlen)
+{
+	struct rtmsg *rtm = NLMSG_DATA(nlh);
+
+	if (filter.cloned)
+		rtm->rtm_flags |= RTM_F_CLONED;
+
+	return 0;
+}
+
 static int iproute_list_flush_or_save(int argc, char **argv, int action)
 {
 	int do_ipv6 = preferred_family;
@@ -1889,16 +1881,9 @@ static int iproute_list_flush_or_save(int argc, char **argv, int action)
 	if (action == IPROUTE_FLUSH)
 		return iproute_flush(do_ipv6, filter_fn);
 
-	if (!filter.cloned) {
+	if (rtnl_routedump_req(&rth, do_ipv6, iproute_dump_filter) < 0) {
-		if (rtnl_routedump_req(&rth, do_ipv6) < 0) {
+		perror("Cannot send dump request");
-			perror("Cannot send dump request");
+		return -2;
-			return -2;
-		}
-	} else {
-		if (rtnl_rtcache_request(&rth, do_ipv6) < 0) {
-			perror("Cannot send dump request");
-			return -2;
-		}
 	}
 
 	new_json_obj(json);

lib/libnetlink.c

@@ -266,11 +266,13 @@ int rtnl_addrlbldump_req(struct rtnl_handle *rth, int family)
 	return send(rth->fd, &req, sizeof(req), 0);
 }
 
-int rtnl_routedump_req(struct rtnl_handle *rth, int family)
+int rtnl_routedump_req(struct rtnl_handle *rth, int family,
+		       req_filter_fn_t filter_fn)
 {
 	struct {
 		struct nlmsghdr nlh;
 		struct rtmsg rtm;
+		char buf[128];
 	} req = {
 		.nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg)),
 		.nlh.nlmsg_type = RTM_GETROUTE,
@@ -279,6 +281,14 @@ int rtnl_routedump_req(struct rtnl_handle *rth, int family)
 		.rtm.rtm_family = family,
 	};
 
+	if (filter_fn) {
+		int err;
+
+		err = filter_fn(&req.nlh, sizeof(req));
+		if (err)
+			return err;
+	}
+
 	return send(rth->fd, &req, sizeof(req), 0);
 }