From 0535d615f6992f1ebe9b0f368cacdb5d5c59301a Mon Sep 17 00:00:00 2001 From: Felix Fietkau Date: Sat, 18 Oct 2025 19:58:45 +0000 Subject: [PATCH] hostapd: increase netlink buffer size When lots of events are waiting to be received, the default buffer size is not enough, and hostapd can run into "No buffer space available" on recvmsg. This will cause the netdev state tracking to go out of sync. Signed-off-by: Felix Fietkau --- .../070-netlink-increase-buffer-size.patch | 31 +++++++++++++++++++ 1 file changed, 31 insertions(+) create mode 100644 package/network/services/hostapd/patches/070-netlink-increase-buffer-size.patch diff --git a/package/network/services/hostapd/patches/070-netlink-increase-buffer-size.patch b/package/network/services/hostapd/patches/070-netlink-increase-buffer-size.patch new file mode 100644 index 0000000000..3f1952f1e3 --- /dev/null +++ b/package/network/services/hostapd/patches/070-netlink-increase-buffer-size.patch @@ -0,0 +1,31 @@ +From: Felix Fietkau +Date: Sat, 18 Oct 2025 21:55:44 +0200 +Subject: [PATCH] netlink: increase buffer size + +When lots of events are waiting to be received, the default buffer size +is not enough, and hostapd can run into "No buffer space available" on +recvmsg. This will cause the netdev state tracking to go out of sync. + +Signed-off-by: Felix Fietkau +--- + +--- a/src/drivers/netlink.c ++++ b/src/drivers/netlink.c +@@ -92,6 +92,7 @@ struct netlink_data * netlink_init(struc + { + struct netlink_data *netlink; + struct sockaddr_nl local; ++ int size = 262144; + + netlink = os_zalloc(sizeof(*netlink)); + if (netlink == NULL) +@@ -105,6 +106,9 @@ struct netlink_data * netlink_init(struc + return NULL; + } + ++ setsockopt(netlink->sock, SOL_SOCKET, SO_RCVBUF, &size, sizeof(size)); ++ setsockopt(netlink->sock, SOL_SOCKET, SO_SNDBUF, &size, sizeof(size)); ++ + os_memset(&local, 0, sizeof(local)); + local.nl_family = AF_NETLINK; + local.nl_groups = RTMGRP_LINK; -- 2.30.2