[PATCH] rtnetlink.7: Add info about ability to create links with given index

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Since kernel v3.7 the RTM_NEWLINK message not accepts non-zero values
in ifi_index field. Mention this fact in the respective rtneltlink.7
section.

Signed-off-by: Pavel Emelyanov <xemul@xxxxxxxxxxxxx>

---

diff --git a/man7/rtnetlink.7 b/man7/rtnetlink.7
index ebd9107..0809026 100644
--- a/man7/rtnetlink.7
+++ b/man7/rtnetlink.7
@@ -78,7 +78,10 @@ struct ifinfomsg {
 contains the device flags, see
 .BR netdevice (7);
 .I ifi_index
-is the unique interface index,
+is the unique interface index (since kernel v3.7 it is possible to feed a non-zero
+value with the
+.B RTM_NEWLINK
+message, thus creating a link with the given ifindex);
 .I ifi_change
 is reserved for future use and should be always set to 0xFFFFFFFF.
 .na
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