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hostapd: increase netlink buffer size
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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 <nbd@nbd.name>
This commit is contained in:
Felix Fietkau 2025-10-18 19:58:45 +00:00
parent 9d531c0c5b
commit 0535d615f6
1 changed files with 31 additions and 0 deletions
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31
package/network/services/hostapd/patches/070-netlink-increase-buffer-size.patch Normal file
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@ -0,0 +1,31 @@
From: Felix Fietkau <nbd@nbd.name>
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 <nbd@nbd.name>
---
--- 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;