From: Hans Schultz <netdev@kapio-technology.com>
To: davem@davemloft.net, kuba@kernel.org
Cc: netdev@vger.kernel.org,
Hans Schultz <netdev@kapio-technology.com>,
Florian Fainelli <f.fainelli@gmail.com>,
Andrew Lunn <andrew@lunn.ch>,
Vivien Didelot <vivien.didelot@gmail.com>,
Vladimir Oltean <olteanv@gmail.com>,
Eric Dumazet <edumazet@google.com>,
Paolo Abeni <pabeni@redhat.com>,
Kurt Kanzenbach <kurt@linutronix.de>,
Hauke Mehrtens <hauke@hauke-m.de>,
Woojung Huh <woojung.huh@microchip.com>,
UNGLinuxDriver@microchip.com, Sean Wang <sean.wang@mediatek.com>,
Landen Chao <Landen.Chao@mediatek.com>,
DENG Qingfang <dqfext@gmail.com>,
Matthias Brugger <matthias.bgg@gmail.com>,
Claudiu Manoil <claudiu.manoil@nxp.com>,
Alexandre Belloni <alexandre.belloni@bootlin.com>,
Jiri Pirko <jiri@resnulli.us>, Ivan Vecera <ivecera@redhat.com>,
Roopa Prabhu <roopa@nvidia.com>,
Nikolay Aleksandrov <razor@blackwall.org>,
Shuah Khan <shuah@kernel.org>,
Russell King <linux@armlinux.org.uk>,
Christian Marangi <ansuelsmth@gmail.com>,
Daniel Borkmann <daniel@iogearbox.net>,
Yuwei Wang <wangyuweihx@gmail.com>,
Petr Machata <petrm@nvidia.com>, Ido Schimmel <idosch@nvidia.com>,
Florent Fourcot <florent.fourcot@wifirst.fr>,
Hans Schultz <schultz.hans@gmail.com>,
Joachim Wiberg <troglobit@gmail.com>,
Amit Cohen <amcohen@nvidia.com>,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-mediatek@lists.infradead.org,
bridge@lists.linux-foundation.org,
linux-kselftest@vger.kernel.org
Subject: [PATCH iproute2-next 2/2] bridge: fdb: enable FDB blackhole feature
Date: Thu, 29 Sep 2022 17:21:37 +0200 [thread overview]
Message-ID: <20220929152137.167626-2-netdev@kapio-technology.com> (raw)
In-Reply-To: <20220929152137.167626-1-netdev@kapio-technology.com>
Block traffic to a specific host with the command:
bridge fdb add <MAC> vlan <vid> dev br0 blackhole
The blackhole FDB entries can be added, deleted and replaced with
ordinary FDB entries.
Signed-off-by: Hans Schultz <netdev@kapio-technology.com>
---
bridge/fdb.c | 7 ++++++-
include/uapi/linux/neighbour.h | 4 ++++
man/man8/bridge.8 | 6 ++++++
3 files changed, 16 insertions(+), 1 deletion(-)
diff --git a/bridge/fdb.c b/bridge/fdb.c
index 0fbe9bd3..2160f1c2 100644
--- a/bridge/fdb.c
+++ b/bridge/fdb.c
@@ -38,7 +38,7 @@ static void usage(void)
fprintf(stderr,
"Usage: bridge fdb { add | append | del | replace } ADDR dev DEV\n"
" [ self ] [ master ] [ use ] [ router ] [ extern_learn ]\n"
- " [ sticky ] [ local | static | dynamic ] [ vlan VID ]\n"
+ " [ sticky ] [ local | static | dynamic ] [blackhole] [ vlan VID ]\n"
" { [ dst IPADDR ] [ port PORT] [ vni VNI ] | [ nhid NHID ] }\n"
" [ via DEV ] [ src_vni VNI ]\n"
" bridge fdb [ show [ br BRDEV ] [ brport DEV ] [ vlan VID ]\n"
@@ -116,6 +116,9 @@ static void fdb_print_flags(FILE *fp, unsigned int flags, __u8 ext_flags)
if (flags & NTF_STICKY)
print_string(PRINT_ANY, NULL, "%s ", "sticky");
+ if (ext_flags & NTF_EXT_BLACKHOLE)
+ print_string(PRINT_ANY, NULL, "%s ", "blackhole");
+
if (ext_flags & NTF_EXT_LOCKED)
print_string(PRINT_ANY, NULL, "%s ", "locked");
@@ -493,6 +496,8 @@ static int fdb_modify(int cmd, int flags, int argc, char **argv)
req.ndm.ndm_flags |= NTF_EXT_LEARNED;
} else if (matches(*argv, "sticky") == 0) {
req.ndm.ndm_flags |= NTF_STICKY;
+ } else if (matches(*argv, "blackhole") == 0) {
+ ext_flags |= NTF_EXT_BLACKHOLE;
} else {
if (strcmp(*argv, "to") == 0)
NEXT_ARG();
diff --git a/include/uapi/linux/neighbour.h b/include/uapi/linux/neighbour.h
index 4dda051b..cc7d540e 100644
--- a/include/uapi/linux/neighbour.h
+++ b/include/uapi/linux/neighbour.h
@@ -54,6 +54,7 @@ enum {
/* Extended flags under NDA_FLAGS_EXT: */
#define NTF_EXT_MANAGED (1 << 0)
#define NTF_EXT_LOCKED (1 << 1)
+#define NTF_EXT_BLACKHOLE (1 << 2)
/*
* Neighbor Cache Entry States.
@@ -91,6 +92,9 @@ enum {
* NTF_EXT_LOCKED flagged FDB entries are placeholder entries used with the
* locked port feature, that ensures that an entry exists while at the same
* time dropping packets on ingress with src MAC and VID matching the entry.
+ *
+ * NTF_EXT_BLACKHOLE flagged FDB entries ensure that no forwarding is allowed
+ * from any port to the destination MAC, VID pair associated with it.
*/
struct nda_cacheinfo {
diff --git a/man/man8/bridge.8 b/man/man8/bridge.8
index 40250477..af2e7db2 100644
--- a/man/man8/bridge.8
+++ b/man/man8/bridge.8
@@ -699,6 +699,12 @@ controller learnt dynamic entry. Kernel will not age such an entry.
- this entry will not change its port due to learning.
.sp
+.B blackhole
+- this is an entry that denies all forwarding from any port to a destination
+matching the entry. It can be added by userspace, but the flag is mostly set
+from a hardware driver.
+.sp
+
.in -8
The next command line parameters apply only
when the specified device
--
2.34.1
next prev parent reply other threads:[~2022-09-29 15:25 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-29 15:21 [PATCH iproute2-next 1/2] bridge: link: enable MacAuth/MAB feature Hans Schultz
2022-09-29 15:21 ` Hans Schultz [this message]
2022-09-29 15:43 ` [Bridge] [PATCH iproute2-next 2/2] bridge: fdb: enable FDB blackhole feature Stephen Hemminger
2022-09-29 16:14 ` netdev
2022-10-01 15:38 ` Ido Schimmel
2022-10-01 21:37 ` netdev
2022-10-03 18:23 ` netdev
2022-10-01 14:59 ` [PATCH iproute2-next 1/2] bridge: link: enable MacAuth/MAB feature Ido Schimmel
2022-10-01 21:32 ` netdev
2022-10-02 7:34 ` Ido Schimmel
2022-10-02 15:20 ` netdev
2022-10-03 8:08 ` Ido Schimmel
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