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John Audia
4c942c06b8
Changelog: https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.18.27 Manually rebased: pending-6.18/151-net-bridge-do-not-send-arp-replies-if-src-and-target.patch All other patches automatically rebased via update_kernel.sh Build system: x86/64 Build-tested: x86/64-glibc Run-tested: x86/64-glibc Signed-off-by: John Audia <therealgraysky@proton.me> Link: https://github.com/openwrt/openwrt/pull/23252 Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
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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@@ -208,7 +208,10 @@ void br_do_proxy_suppress_arp(struct sk_
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if ((p && (p->flags & BR_PROXYARP)) ||
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(dst && (dst->flags & BR_PROXYARP_WIFI)) ||
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br_is_neigh_suppress_enabled(dst, vid)) {
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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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@@ -216,7 +219,6 @@ 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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