mirror of
git://git.openwrt.org/openwrt/openwrt.git
synced 2025-11-03 22:44:27 -05:00
c1ad78318c
There are broken devices in the wild that handle duplicate IP address detection by sending out ARP requests for the IP that they received from a DHCP server and refuse the address if they get a reply. When proxyarp is enabled, they would go into a loop of requesting an address and then NAKing it again. Fixes: https://github.com/openwrt/openwrt/issues/14309 Signed-off-by: Felix Fietkau <nbd@nbd.name>
38 lines
1.3 KiB
Diff
38 lines
1.3 KiB
Diff
From: Felix Fietkau <nbd@nbd.name>
|
|
Date: Thu, 4 Jan 2024 15:21:21 +0100
|
|
Subject: [PATCH] net: bridge: do not send arp replies if src and target hw
|
|
addr is the same
|
|
|
|
There are broken devices in the wild that handle duplicate IP address
|
|
detection by sending out ARP requests for the IP that they received from a
|
|
DHCP server and refuse the address if they get a reply.
|
|
When proxyarp is enabled, they would go into a loop of requesting an address
|
|
and then NAKing it again.
|
|
|
|
Link: https://github.com/openwrt/openwrt/issues/14309
|
|
Signed-off-by: Felix Fietkau <nbd@nbd.name>
|
|
---
|
|
|
|
--- a/net/bridge/br_arp_nd_proxy.c
|
|
+++ b/net/bridge/br_arp_nd_proxy.c
|
|
@@ -204,7 +204,10 @@ void br_do_proxy_suppress_arp(struct sk_
|
|
if ((p && (p->flags & BR_PROXYARP)) ||
|
|
(f->dst && (f->dst->flags & (BR_PROXYARP_WIFI |
|
|
BR_NEIGH_SUPPRESS)))) {
|
|
- if (!vid)
|
|
+ replied = true;
|
|
+ if (!memcmp(n->ha, sha, dev->addr_len))
|
|
+ replied = false;
|
|
+ else if (!vid)
|
|
br_arp_send(br, p, skb->dev, sip, tip,
|
|
sha, n->ha, sha, 0, 0);
|
|
else
|
|
@@ -212,7 +215,6 @@ void br_do_proxy_suppress_arp(struct sk_
|
|
sha, n->ha, sha,
|
|
skb->vlan_proto,
|
|
skb_vlan_tag_get(skb));
|
|
- replied = true;
|
|
}
|
|
|
|
/* If we have replied or as long as we know the
|