[PATCH 17/18] xfrm: restrict netlink attributes for XFRM_MSG_MIGRATE_STATE

[Steffen Klassert <steffen.klassert@secunet.com>]

From: Antony Antony <antony.antony@secunet.com>

Only accept XFRMA used in this method, reject the rest.

Signed-off-by: Antony Antony <antony.antony@secunet.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
---
 net/xfrm/xfrm_user.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index b9fbb8d13c1a..e1010b5315e9 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -3788,6 +3788,30 @@ static int xfrm_reject_unused_attr(int type, struct nlattr **attrs,
 		}
 	}
 
+	if (type == XFRM_MSG_MIGRATE_STATE) {
+		int i;
+
+		for (i = 0; i <= XFRMA_MAX; i++) {
+			if (!attrs[i])
+				continue;
+
+			switch (i) {
+			case XFRMA_MARK:
+			case XFRMA_ENCAP:
+			case XFRMA_OFFLOAD_DEV:
+			case XFRMA_SET_MARK:
+			case XFRMA_SET_MARK_MASK:
+			case XFRMA_MTIMER_THRESH:
+			case XFRMA_NAT_KEEPALIVE_INTERVAL:
+				break;
+			default:
+				NL_SET_ERR_MSG_ATTR(extack, attrs[i],
+						    "Unsupported attribute in XFRM_MSG_MIGRATE_STATE");
+				return -EINVAL;
+			}
+		}
+	}
+
 	return 0;
 }
 
-- 
2.43.0