[PATCH net 1/2] net/sched: cls_route: reject change with no routing attribute

[Victor Nogueira <victor@mojatatu.com>]

route4_change on a filter change that supplies no routing attribute
at all (no to/from/iif) reaches route4_set_parms with fold set, so the
handle-mismatch check -- which only fires when creating -- is skipped.
nhandle is built as the all-wildcard bucket (0x8000 | 0xFFFF << 16) and
the filter is rekeyed to 0xFFFF8000, so the handle userspace already
stored no longer addresses the filter. (The netlink reply carries the
new handle; what goes stale is the handle the caller holds.)

The rekey actually misclassifies the packets. The new handle's from_hash
is the wildcard chain (route4_hash_wild), whose filters route4_classify
applies without any id/iif comparison, and its bucket (256) is reached
by every packet through the h < 256 restart. A filter that matched only
a specific realm therefore becomes an unconditional catch-all that applies
its classid and actions to all otherwise-unmatched traffic.

Reject a change that would rekey the filter this way, with the
routing-attributes-required error. A change that names at least one of
to/from/iif, and an in-place replace that keeps the routing identity via
a supplied attribute, are unaffected. A change of a filter that already
sits at the wildcard handle is a metadata-only update and remains valid,
so only a change that actually moves the handle is rejected.

This is a follow-up to commit 41e85e54e564 ("net/sched: cls_route: Fix
in-place replace"); this patch closes the no-routing-attribute variant
that the parent series did not address.

Conditions to recreate the bug:
  tc qdisc add dev lo clsact
  tc filter add dev lo ingress protocol ip pref 100 route from 1 to 1
  tc filter change dev lo ingress protocol ip pref 100 handle 0x10001 \
      route classid 1:2
  tc filter show dev lo ingress   # handle became 0xffff8000; iproute2's
                                  # stored 0x10001 no longer addresses it

A change of a filter already at the wildcard handle, e.g. one created by
"tc filter add dev lo ingress protocol ip pref 100 route classid 1:1"
(iproute2 defaults the handle to 0xffff8000), stays a valid metadata-only
update.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Reported-by: Sashiko <sashiko-bot@kernel.org>
Closes: https://netdev-ai.bots.linux.dev/sashiko/#/patchset/20260907192133.2639067-1-victor@mojatatu.com
Reviewed-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: Victor Nogueira <victor@mojatatu.com>
---
 net/sched/cls_route.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/net/sched/cls_route.c b/net/sched/cls_route.c
index 0f211f030fd9..dca812a75269 100644
--- a/net/sched/cls_route.c
+++ b/net/sched/cls_route.c
@@ -434,6 +434,12 @@ static int route4_set_parms(struct net *net, struct tcf_proto *tp,
 	if (handle && (!fold || nhandle == (handle & ~0x7F00)))
 		nhandle |= handle & 0x7F00;
 
+	if (fold && !tb[TCA_ROUTE4_TO] && !tb[TCA_ROUTE4_FROM] &&
+	    !tb[TCA_ROUTE4_IIF] && nhandle != fold->handle) {
+		NL_SET_ERR_MSG(extack, "Routing attributes required");
+		return -EINVAL;
+	}
+
 	if (handle && !fold && nhandle != handle) {
 		NL_SET_ERR_MSG_FMT(extack,
 				   "Handle mismatch constructed: %x (expected: %x)",
-- 
2.43.0