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49bde57679
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>
(cherry picked from commit c1ad78318c)
38 lines
1.3 KiB
Diff
38 lines
1.3 KiB
Diff
From: Felix Fietkau <nbd@nbd.name>
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Date: Thu, 4 Jan 2024 15:21:21 +0100
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Subject: [PATCH] net: bridge: do not send arp replies if src and target hw
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addr is the same
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There are broken devices in the wild that handle duplicate IP address
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detection by sending out ARP requests for the IP that they received from a
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DHCP server and refuse the address if they get a reply.
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When proxyarp is enabled, they would go into a loop of requesting an address
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and then NAKing it again.
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Link: https://github.com/openwrt/openwrt/issues/14309
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Signed-off-by: Felix Fietkau <nbd@nbd.name>
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---
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--- a/net/bridge/br_arp_nd_proxy.c
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+++ b/net/bridge/br_arp_nd_proxy.c
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@@ -204,7 +204,10 @@ void br_do_proxy_suppress_arp(struct sk_
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if ((p && (p->flags & BR_PROXYARP)) ||
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(f->dst && (f->dst->flags & (BR_PROXYARP_WIFI |
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BR_NEIGH_SUPPRESS)))) {
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- if (!vid)
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+ replied = true;
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+ if (!memcmp(n->ha, sha, dev->addr_len))
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+ replied = false;
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+ else if (!vid)
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br_arp_send(br, p, skb->dev, sip, tip,
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sha, n->ha, sha, 0, 0);
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else
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@@ -212,7 +215,6 @@ void br_do_proxy_suppress_arp(struct sk_
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sha, n->ha, sha,
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skb->vlan_proto,
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skb_vlan_tag_get(skb));
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- replied = true;
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}
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/* If we have replied or as long as we know the
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