net: Add struct for fib dump filter

Add struct fib_dump_filter for options on limiting which routes are
returned in a dump request. The current list is table id, protocol,
route type, rtm_flags and nexthop device index. struct net is needed
to lookup the net_device from the index.

Declare the filter for each route dump handler and plumb the new
arguments from dump handlers to ip_valid_fib_dump_req.

Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

5 files changed, 24 insertions, 10 deletions

diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c
index 0f1beceb47d5..850850dd80e1 100644
--- a/net/ipv4/fib_frontend.c
+++ b/net/ipv4/fib_frontend.c
@@ -802,7 +802,8 @@ errout:
 	return err;
 }
 
-int ip_valid_fib_dump_req(const struct nlmsghdr *nlh,
+int ip_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh,
+			  struct fib_dump_filter *filter,
 			  struct netlink_ext_ack *extack)
 {
 	struct rtmsg *rtm;
@@ -837,6 +838,7 @@ static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb)
 {
 	const struct nlmsghdr *nlh = cb->nlh;
 	struct net *net = sock_net(skb->sk);
+	struct fib_dump_filter filter = {};
 	unsigned int h, s_h;
 	unsigned int e = 0, s_e;
 	struct fib_table *tb;
@@ -844,7 +846,7 @@ static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb)
 	int dumped = 0, err;
 
 	if (cb->strict_check) {
-		err = ip_valid_fib_dump_req(nlh, cb->extack);
+		err = ip_valid_fib_dump_req(net, nlh, &filter, cb->extack);
 		if (err < 0)
 			return err;
 	}
diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c
index 91b0d5671649..44d777058960 100644
--- a/net/ipv4/ipmr.c
+++ b/net/ipv4/ipmr.c
@@ -2527,9 +2527,13 @@ errout_free:
 
 static int ipmr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb)
 {
+	struct fib_dump_filter filter = {};
+
 	if (cb->strict_check) {
-		int err = ip_valid_fib_dump_req(cb->nlh, cb->extack);
+		int err;
 
+		err = ip_valid_fib_dump_req(sock_net(skb->sk), cb->nlh,
+					    &filter, cb->extack);
 		if (err < 0)
 			return err;
 	}
diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c
index 0783af11b0b7..94e61fe47ff8 100644
--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c
@@ -569,17 +569,18 @@ static int inet6_dump_fib(struct sk_buff *skb, struct netlink_callback *cb)
 {
 	const struct nlmsghdr *nlh = cb->nlh;
 	struct net *net = sock_net(skb->sk);
+	struct rt6_rtnl_dump_arg arg = {};
 	unsigned int h, s_h;
 	unsigned int e = 0, s_e;
-	struct rt6_rtnl_dump_arg arg;
 	struct fib6_walker *w;
 	struct fib6_table *tb;
 	struct hlist_head *head;
 	int res = 0;
 
 	if (cb->strict_check) {
-		int err = ip_valid_fib_dump_req(nlh, cb->extack);
+		int err;
 
+		err = ip_valid_fib_dump_req(net, nlh, &arg.filter, cb->extack);
 		if (err < 0)
 			return err;
 	}
diff --git a/net/ipv6/ip6mr.c b/net/ipv6/ip6mr.c
index d7563ef76518..dbd5166c5599 100644
--- a/net/ipv6/ip6mr.c
+++ b/net/ipv6/ip6mr.c
@@ -2458,10 +2458,13 @@ errout:
 static int ip6mr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb)
 {
 	const struct nlmsghdr *nlh = cb->nlh;
+	struct fib_dump_filter filter = {};
 
 	if (cb->strict_check) {
-		int err = ip_valid_fib_dump_req(nlh, cb->extack);
+		int err;
 
+		err = ip_valid_fib_dump_req(sock_net(skb->sk), nlh,
+					    &filter, cb->extack);
 		if (err < 0)
 			return err;
 	}
diff --git a/net/mpls/af_mpls.c b/net/mpls/af_mpls.c
index 5fe274c47c41..bfcb4759c9ee 100644
--- a/net/mpls/af_mpls.c
+++ b/net/mpls/af_mpls.c
@@ -2032,13 +2032,15 @@ nla_put_failure:
 }
 
 #if IS_ENABLED(CONFIG_INET)
-static int mpls_valid_fib_dump_req(const struct nlmsghdr *nlh,
+static int mpls_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh,
+				   struct fib_dump_filter *filter,
 				   struct netlink_ext_ack *extack)
 {
-	return ip_valid_fib_dump_req(nlh, extack);
+	return ip_valid_fib_dump_req(net, nlh, filter, extack);
 }
 #else
-static int mpls_valid_fib_dump_req(const struct nlmsghdr *nlh,
+static int mpls_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh,
+				   struct fib_dump_filter *filter,
 				   struct netlink_ext_ack *extack)
 {
 	struct rtmsg *rtm;
@@ -2070,14 +2072,16 @@ static int mpls_dump_routes(struct sk_buff *skb, struct netlink_callback *cb)
 	const struct nlmsghdr *nlh = cb->nlh;
 	struct net *net = sock_net(skb->sk);
 	struct mpls_route __rcu **platform_label;
+	struct fib_dump_filter filter = {};
 	size_t platform_labels;
 	unsigned int index;
 
 	ASSERT_RTNL();
 
 	if (cb->strict_check) {
-		int err = mpls_valid_fib_dump_req(nlh, cb->extack);
+		int err;
 
+		err = mpls_valid_fib_dump_req(net, nlh, &filter, cb->extack);
 		if (err < 0)
 			return err;
 	}