The branch main has been updated by kp:
URL:
https://cgit.FreeBSD.org/src/commit/?id=01ad0c0079646a31afa20e1f07e5b62b82613493
commit 01ad0c0079646a31afa20e1f07e5b62b82613493
Author: Kristof Provost <k...@freebsd.org>
AuthorDate: 2021-07-26 10:18:27 +0000
Commit: Kristof Provost <k...@freebsd.org>
CommitDate: 2021-07-28 20:03:30 +0000
net: disallow MTU changes on bridge member interfaces
if_bridge member interfaces should always have the same MTU as the
bridge itself, so disallow MTU changes on interfaces that are part of an
if_bridge.
Reviewed by: donner
Sponsored by: Rubicon Communications, LLC ("Netgate")
Differential Revision: https://reviews.freebsd.org/D31304
---
sys/net/if.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/sys/net/if.c b/sys/net/if.c
index cfa795904bc9..8d2a66471836 100644
--- a/sys/net/if.c
+++ b/sys/net/if.c
@@ -2746,6 +2746,9 @@ ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data,
struct thread *td)
return (EINVAL);
if (ifp->if_ioctl == NULL)
return (EOPNOTSUPP);
+ /* Disallow MTU changes on bridge member interfaces. */
+ if (ifp->if_bridge)
+ return (EOPNOTSUPP);
error = (*ifp->if_ioctl)(ifp, cmd, data);
if (error == 0) {
getmicrotime(&ifp->if_lastchange);
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