Subject: [PATCH RFC v2 net-next 10/25] rtnetlink: Update ipmr_rtm_dumplink to support NLM_F_DUMP_PROPER_HDR

From: David Ahern <[email-masked]>
Date: Mon, 1 Oct 2018 17:28:36 -0700

From: David Ahern <[email-masked]>

Update ipmr_rtm_dumplink to check for NLM_F_DUMP_PROPER_HDR in the netlink
message header. If the flag is set, the dump request is expected to have
an ifinfomsg struct as the header. All elements of the struct are
expected to be 0 and no attributes can be appended.

Signed-off-by: David Ahern <[email-masked]>
---
 net/ipv4/ipmr.c | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c
index 5660adcf7a04..a706e9269e8c 100644
--- a/net/ipv4/ipmr.c
+++ b/net/ipv4/ipmr.c
@@ -2710,6 +2710,31 @@ static bool ipmr_fill_vif(struct mr_table *mrt, u32 vifid, struct sk_buff *skb)
 	return true;
 }
 
+static int ipmr_valid_dumplink(const struct nlmsghdr *nlh,
+			       struct netlink_ext_ack *extack)
+{
+	struct ifinfomsg *ifm;
+
+	if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
+		NL_SET_ERR_MSG(extack, "Invalid header");
+		return -EINVAL;
+	}
+
+	if (nlh->nlmsg_len > nlmsg_msg_size(sizeof(*ifm))) {
+		NL_SET_ERR_MSG(extack, "Invalid data after header");
+		return -EINVAL;
+	}
+
+	ifm = nlmsg_data(nlh);
+	if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
+	    ifm->ifi_change || ifm->ifi_index) {
+		NL_SET_ERR_MSG(extack, "Invalid values in header for dump request");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
 static int ipmr_rtm_dumplink(struct sk_buff *skb, struct netlink_callback *cb)
 {
 	struct net *net = sock_net(skb->sk);
@@ -2718,6 +2743,13 @@ static int ipmr_rtm_dumplink(struct sk_buff *skb, struct netlink_callback *cb)
 	unsigned int e = 0, s_e;
 	struct mr_table *mrt;
 
+	if (cb->nlh->nlmsg_flags & NLM_F_DUMP_PROPER_HDR) {
+		int err = ipmr_valid_dumplink(cb->nlh, cb->extack);
+
+		if (err)
+			return err;
+	}
+
 	s_t = cb->args[0];
 	s_e = cb->args[1];
 
-- 
2.11.0