[FS#4058] netifd fails to delete 6to4 tunnel

[OpenWrt Bugs]

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User who did this - bolvan (bolvan) 

Attached to Project - OpenWrt/LEDE Project
Summary - netifd fails to delete 6to4 tunnel
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Medium
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - tp-link archer c6u
openwrt snapshot r0-9c3b1d5
After upgrade to snapshot version from 21.02 I found that netifd infinitely retries to ifup 6to4 interface with lots of messages in the syslog
On 'ifdown 6to4' netifd should delete 6to4-6to4 interface but it can't
link still remains and this causes error during 'ifup 6to4'
ioctl SIOCADDTUNNEL returns ENOBUFFS
If the link is manually deleted then netifd succeeds

I traced the problem in netifd c code and found  this non-working code

static int __system_del_ip_tunnel(const char *name, struct blob_attr **tb)
{
	struct blob_attr *cur;
	const char *str;

	if (!(cur = tb[TUNNEL_ATTR_TYPE]))
		return -EINVAL;
	str = blobmsg_data(cur);

	if (!strcmp(str, "greip") || !strcmp(str, "gretapip") ||
	    !strcmp(str, "greip6") || !strcmp(str, "gretapip6") ||
	    !strcmp(str, "vtiip") || !strcmp(str, "vtiip6") ||
	    !strcmp(str, "vxlan") || !strcmp(str, "vxlan6") ||
	    !strcmp(str, "xfrm"))
		return system_link_del(name);
	else
	{
                // THIS DOES NOT WORK. I guess interface name should not be passed as the 1st parameter but inside special structure in the third parameter (see SIOCADDTUNNEL)
		return tunnel_ioctl(name, SIOCDELTUNNEL, NULL);
	}
}


with additional !strcmp(str, "sit")  it starts working again


More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=4058

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