From c1ad78318c3e6421e60dd187477f38ca5f9a5752 Mon Sep 17 00:00:00 2001 From: Felix Fietkau Date: Fri, 5 Jan 2024 11:58:15 +0100 Subject: [PATCH] kernel: fix bridge proxyarp issue with some broken DHCP clients 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 --- ...t-send-arp-replies-if-src-and-target.patch | 37 +++++++++++++++++++ ...t-send-arp-replies-if-src-and-target.patch | 37 +++++++++++++++++++ 2 files changed, 74 insertions(+) create mode 100644 target/linux/generic/pending-5.15/151-net-bridge-do-not-send-arp-replies-if-src-and-target.patch create mode 100644 target/linux/generic/pending-6.1/151-net-bridge-do-not-send-arp-replies-if-src-and-target.patch diff --git a/target/linux/generic/pending-5.15/151-net-bridge-do-not-send-arp-replies-if-src-and-target.patch b/target/linux/generic/pending-5.15/151-net-bridge-do-not-send-arp-replies-if-src-and-target.patch new file mode 100644 index 0000000000..f420d210c2 --- /dev/null +++ b/target/linux/generic/pending-5.15/151-net-bridge-do-not-send-arp-replies-if-src-and-target.patch @@ -0,0 +1,37 @@ +From: Felix Fietkau +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 +--- + +--- 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 diff --git a/target/linux/generic/pending-6.1/151-net-bridge-do-not-send-arp-replies-if-src-and-target.patch b/target/linux/generic/pending-6.1/151-net-bridge-do-not-send-arp-replies-if-src-and-target.patch new file mode 100644 index 0000000000..f420d210c2 --- /dev/null +++ b/target/linux/generic/pending-6.1/151-net-bridge-do-not-send-arp-replies-if-src-and-target.patch @@ -0,0 +1,37 @@ +From: Felix Fietkau +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 +--- + +--- 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 -- 2.30.2