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

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