2 files changed, 8 insertions, 0 deletions

diff --git a/lib/libc/sys/Symbol.map b/lib/libc/sys/Symbol.map
index 137f4379ee99..9ef93d37247c 100644
--- a/lib/libc/sys/Symbol.map
+++ b/lib/libc/sys/Symbol.map
@@ -348,6 +348,7 @@ FBSD_1.1 {
 	openat;
 	readlinkat;
 	renameat;
+	setfib;
 	symlinkat;
 	unlinkat;
 };
diff --git a/lib/libc/sys/getsockopt.2 b/lib/libc/sys/getsockopt.2
index 3ea34c9b87d6..212843253882 100644
--- a/lib/libc/sys/getsockopt.2
+++ b/lib/libc/sys/getsockopt.2
@@ -168,6 +168,7 @@ for the socket
 .It Dv SO_ACCEPTCONN Ta "get listening status of the socket (get only)"
 .It Dv SO_TYPE Ta "get the type of the socket (get only)"
 .It Dv SO_ERROR Ta "get and clear error on the socket (get only)"
+.It Dv SO_SETFIB Ta "set the associated FIB (routing table) for the socket (set only)"
 .El
 .Pp
 .Dv SO_DEBUG
@@ -316,6 +317,12 @@ or with the error
 .Er EWOULDBLOCK
 if no data were received.
 .Pp
+.Dv SO_SETFIB
+can be used to over-ride the default FIB (routing table) for the given socket.
+The value must be from 0 to one less than the number returned from
+the sysctl
+.Em net.fibs .
+.Pp
 .Dv SO_ACCEPTFILTER
 places an
 .Xr accept_filter 9