Re: [PATCH net-next v4] selftests: net: add test for ipv6 fragmentation

[Jakub Kicinski <kuba@kernel.org>]

On Mon,  1 Sep 2025 12:37:14 +0000 Brett A C Sheffield wrote:
> +static int setup(void)
> +{
> +	struct ifreq ifr = {
> +		.ifr_name = "lo"
> +	};
> +	int fd = -1;
> +	int ctl;
> +
> +	/* we need to set MTU, so do this in a namespace to play nicely */
> +	if (unshare(CLONE_NEWNET) == -1)
> +		error(KSFT_FAIL, errno, "unshare");
> +
> +	ctl = socket(AF_LOCAL, SOCK_STREAM, 0);
> +	if (ctl == -1)
> +		error(KSFT_FAIL, errno, "socket");
> +
> +	/* ensure MTU is smaller than what we plan to send */
> +	ifr.ifr_mtu = MTU;
> +	if (ioctl(ctl, SIOCSIFMTU, &ifr) == -1)
> +		error(KSFT_FAIL, errno, "ioctl: set MTU");
> +
> +	disable_dad("lo");
> +	interface_up(ctl, &ifr);
> +
> +	close(ctl);
> +	return fd;

fd is unused here
-- 
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