// https://syzkaller.appspot.com/bug?id=80adeb4b348bed8842a712b8880956e652002fbb
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <arpa/inet.h>
#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <net/if.h>
#include <net/if_arp.h>
#include <netinet/in.h>
#include <sched.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/mount.h>
#include <sys/prctl.h>
#include <sys/resource.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/sysmacros.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/uio.h>
#include <sys/wait.h>
#include <unistd.h>

#include <linux/capability.h>
#include <linux/genetlink.h>
#include <linux/if_addr.h>
#include <linux/if_ether.h>
#include <linux/if_link.h>
#include <linux/if_tun.h>
#include <linux/in6.h>
#include <linux/ip.h>
#include <linux/neighbour.h>
#include <linux/net.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <linux/tcp.h>
#include <linux/veth.h>

static unsigned long long procid;

#define BITMASK(bf_off, bf_len) (((1ull << (bf_len)) - 1) << (bf_off))
#define STORE_BY_BITMASK(type, htobe, addr, val, bf_off, bf_len)               \
  *(type*)(addr) =                                                             \
      htobe((htobe(*(type*)(addr)) & ~BITMASK((bf_off), (bf_len))) |           \
            (((type)(val) << (bf_off)) & BITMASK((bf_off), (bf_len))))

struct csum_inet {
  uint32_t acc;
};

static void csum_inet_init(struct csum_inet* csum)
{
  csum->acc = 0;
}

static void csum_inet_update(struct csum_inet* csum, const uint8_t* data,
                             size_t length)
{
  if (length == 0)
    return;
  size_t i = 0;
  for (; i < length - 1; i += 2)
    csum->acc += *(uint16_t*)&data[i];
  if (length & 1)
    csum->acc += le16toh((uint16_t)data[length - 1]);
  while (csum->acc > 0xffff)
    csum->acc = (csum->acc & 0xffff) + (csum->acc >> 16);
}

static uint16_t csum_inet_digest(struct csum_inet* csum)
{
  return ~csum->acc;
}

static bool write_file(const char* file, const char* what, ...)
{
  char buf[1024];
  va_list args;
  va_start(args, what);
  vsnprintf(buf, sizeof(buf), what, args);
  va_end(args);
  buf[sizeof(buf) - 1] = 0;
  int len = strlen(buf);
  int fd = open(file, O_WRONLY | O_CLOEXEC);
  if (fd == -1)
    return false;
  if (write(fd, buf, len) != len) {
    int err = errno;
    close(fd);
    errno = err;
    return false;
  }
  close(fd);
  return true;
}

struct nlmsg {
  char* pos;
  int nesting;
  struct nlattr* nested[8];
  char buf[4096];
};

static void netlink_init(struct nlmsg* nlmsg, int typ, int flags,
                         const void* data, int size)
{
  memset(nlmsg, 0, sizeof(*nlmsg));
  struct nlmsghdr* hdr = (struct nlmsghdr*)nlmsg->buf;
  hdr->nlmsg_type = typ;
  hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK | flags;
  memcpy(hdr + 1, data, size);
  nlmsg->pos = (char*)(hdr + 1) + NLMSG_ALIGN(size);
}

static void netlink_attr(struct nlmsg* nlmsg, int typ, const void* data,
                         int size)
{
  struct nlattr* attr = (struct nlattr*)nlmsg->pos;
  attr->nla_len = sizeof(*attr) + size;
  attr->nla_type = typ;
  if (size > 0)
    memcpy(attr + 1, data, size);
  nlmsg->pos += NLMSG_ALIGN(attr->nla_len);
}

static void netlink_nest(struct nlmsg* nlmsg, int typ)
{
  struct nlattr* attr = (struct nlattr*)nlmsg->pos;
  attr->nla_type = typ;
  nlmsg->pos += sizeof(*attr);
  nlmsg->nested[nlmsg->nesting++] = attr;
}

static void netlink_done(struct nlmsg* nlmsg)
{
  struct nlattr* attr = nlmsg->nested[--nlmsg->nesting];
  attr->nla_len = nlmsg->pos - (char*)attr;
}

static int netlink_send_ext(struct nlmsg* nlmsg, int sock, uint16_t reply_type,
                            int* reply_len, bool dofail)
{
  if (nlmsg->pos > nlmsg->buf + sizeof(nlmsg->buf) || nlmsg->nesting)
    exit(1);
  struct nlmsghdr* hdr = (struct nlmsghdr*)nlmsg->buf;
  hdr->nlmsg_len = nlmsg->pos - nlmsg->buf;
  struct sockaddr_nl addr;
  memset(&addr, 0, sizeof(addr));
  addr.nl_family = AF_NETLINK;
  ssize_t n = sendto(sock, nlmsg->buf, hdr->nlmsg_len, 0,
                     (struct sockaddr*)&addr, sizeof(addr));
  if (n != (ssize_t)hdr->nlmsg_len) {
    if (dofail)
      exit(1);
    return -1;
  }
  n = recv(sock, nlmsg->buf, sizeof(nlmsg->buf), 0);
  if (reply_len)
    *reply_len = 0;
  if (n < 0) {
    if (dofail)
      exit(1);
    return -1;
  }
  if (n < (ssize_t)sizeof(struct nlmsghdr)) {
    errno = EINVAL;
    if (dofail)
      exit(1);
    return -1;
  }
  if (hdr->nlmsg_type == NLMSG_DONE)
    return 0;
  if (reply_len && hdr->nlmsg_type == reply_type) {
    *reply_len = n;
    return 0;
  }
  if (n < (ssize_t)(sizeof(struct nlmsghdr) + sizeof(struct nlmsgerr))) {
    errno = EINVAL;
    if (dofail)
      exit(1);
    return -1;
  }
  if (hdr->nlmsg_type != NLMSG_ERROR) {
    errno = EINVAL;
    if (dofail)
      exit(1);
    return -1;
  }
  errno = -((struct nlmsgerr*)(hdr + 1))->error;
  return -errno;
}

static int netlink_send(struct nlmsg* nlmsg, int sock)
{
  return netlink_send_ext(nlmsg, sock, 0, NULL, true);
}

static int netlink_query_family_id(struct nlmsg* nlmsg, int sock,
                                   const char* family_name, bool dofail)
{
  struct genlmsghdr genlhdr;
  memset(&genlhdr, 0, sizeof(genlhdr));
  genlhdr.cmd = CTRL_CMD_GETFAMILY;
  netlink_init(nlmsg, GENL_ID_CTRL, 0, &genlhdr, sizeof(genlhdr));
  netlink_attr(nlmsg, CTRL_ATTR_FAMILY_NAME, family_name,
               strnlen(family_name, GENL_NAMSIZ - 1) + 1);
  int n = 0;
  int err = netlink_send_ext(nlmsg, sock, GENL_ID_CTRL, &n, dofail);
  if (err < 0) {
    return -1;
  }
  uint16_t id = 0;
  struct nlattr* attr = (struct nlattr*)(nlmsg->buf + NLMSG_HDRLEN +
                                         NLMSG_ALIGN(sizeof(genlhdr)));
  for (; (char*)attr < nlmsg->buf + n;
       attr = (struct nlattr*)((char*)attr + NLMSG_ALIGN(attr->nla_len))) {
    if (attr->nla_type == CTRL_ATTR_FAMILY_ID) {
      id = *(uint16_t*)(attr + 1);
      break;
    }
  }
  if (!id) {
    errno = EINVAL;
    return -1;
  }
  recv(sock, nlmsg->buf, sizeof(nlmsg->buf), 0);
  return id;
}

static int netlink_next_msg(struct nlmsg* nlmsg, unsigned int offset,
                            unsigned int total_len)
{
  struct nlmsghdr* hdr = (struct nlmsghdr*)(nlmsg->buf + offset);
  if (offset == total_len || offset + hdr->nlmsg_len > total_len)
    return -1;
  return hdr->nlmsg_len;
}

static unsigned int queue_count = 2;

static void netlink_add_device_impl(struct nlmsg* nlmsg, const char* type,
                                    const char* name, bool up)
{
  struct ifinfomsg hdr;
  memset(&hdr, 0, sizeof(hdr));
  if (up)
    hdr.ifi_flags = hdr.ifi_change = IFF_UP;
  netlink_init(nlmsg, RTM_NEWLINK, NLM_F_EXCL | NLM_F_CREATE, &hdr,
               sizeof(hdr));
  if (name)
    netlink_attr(nlmsg, IFLA_IFNAME, name, strlen(name));
  netlink_attr(nlmsg, IFLA_NUM_TX_QUEUES, &queue_count, sizeof(queue_count));
  netlink_attr(nlmsg, IFLA_NUM_RX_QUEUES, &queue_count, sizeof(queue_count));
  netlink_nest(nlmsg, IFLA_LINKINFO);
  netlink_attr(nlmsg, IFLA_INFO_KIND, type, strlen(type));
}

static void netlink_add_device(struct nlmsg* nlmsg, int sock, const char* type,
                               const char* name)
{
  netlink_add_device_impl(nlmsg, type, name, false);
  netlink_done(nlmsg);
  int err = netlink_send(nlmsg, sock);
  if (err < 0) {
  }
}

static void netlink_add_veth(struct nlmsg* nlmsg, int sock, const char* name,
                             const char* peer)
{
  netlink_add_device_impl(nlmsg, "veth", name, false);
  netlink_nest(nlmsg, IFLA_INFO_DATA);
  netlink_nest(nlmsg, VETH_INFO_PEER);
  nlmsg->pos += sizeof(struct ifinfomsg);
  netlink_attr(nlmsg, IFLA_IFNAME, peer, strlen(peer));
  netlink_attr(nlmsg, IFLA_NUM_TX_QUEUES, &queue_count, sizeof(queue_count));
  netlink_attr(nlmsg, IFLA_NUM_RX_QUEUES, &queue_count, sizeof(queue_count));
  netlink_done(nlmsg);
  netlink_done(nlmsg);
  netlink_done(nlmsg);
  int err = netlink_send(nlmsg, sock);
  if (err < 0) {
  }
}

static void netlink_add_xfrm(struct nlmsg* nlmsg, int sock, const char* name)
{
  netlink_add_device_impl(nlmsg, "xfrm", name, true);
  netlink_nest(nlmsg, IFLA_INFO_DATA);
  int if_id = 1;
  netlink_attr(nlmsg, 2, &if_id, sizeof(if_id));
  netlink_done(nlmsg);
  netlink_done(nlmsg);
  int err = netlink_send(nlmsg, sock);
  if (err < 0) {
  }
}

static void netlink_add_hsr(struct nlmsg* nlmsg, int sock, const char* name,
                            const char* slave1, const char* slave2)
{
  netlink_add_device_impl(nlmsg, "hsr", name, false);
  netlink_nest(nlmsg, IFLA_INFO_DATA);
  int ifindex1 = if_nametoindex(slave1);
  netlink_attr(nlmsg, IFLA_HSR_SLAVE1, &ifindex1, sizeof(ifindex1));
  int ifindex2 = if_nametoindex(slave2);
  netlink_attr(nlmsg, IFLA_HSR_SLAVE2, &ifindex2, sizeof(ifindex2));
  netlink_done(nlmsg);
  netlink_done(nlmsg);
  int err = netlink_send(nlmsg, sock);
  if (err < 0) {
  }
}

static void netlink_add_linked(struct nlmsg* nlmsg, int sock, const char* type,
                               const char* name, const char* link)
{
  netlink_add_device_impl(nlmsg, type, name, false);
  netlink_done(nlmsg);
  int ifindex = if_nametoindex(link);
  netlink_attr(nlmsg, IFLA_LINK, &ifindex, sizeof(ifindex));
  int err = netlink_send(nlmsg, sock);
  if (err < 0) {
  }
}

static void netlink_add_vlan(struct nlmsg* nlmsg, int sock, const char* name,
                             const char* link, uint16_t id, uint16_t proto)
{
  netlink_add_device_impl(nlmsg, "vlan", name, false);
  netlink_nest(nlmsg, IFLA_INFO_DATA);
  netlink_attr(nlmsg, IFLA_VLAN_ID, &id, sizeof(id));
  netlink_attr(nlmsg, IFLA_VLAN_PROTOCOL, &proto, sizeof(proto));
  netlink_done(nlmsg);
  netlink_done(nlmsg);
  int ifindex = if_nametoindex(link);
  netlink_attr(nlmsg, IFLA_LINK, &ifindex, sizeof(ifindex));
  int err = netlink_send(nlmsg, sock);
  if (err < 0) {
  }
}

static void netlink_add_macvlan(struct nlmsg* nlmsg, int sock, const char* name,
                                const char* link)
{
  netlink_add_device_impl(nlmsg, "macvlan", name, false);
  netlink_nest(nlmsg, IFLA_INFO_DATA);
  uint32_t mode = MACVLAN_MODE_BRIDGE;
  netlink_attr(nlmsg, IFLA_MACVLAN_MODE, &mode, sizeof(mode));
  netlink_done(nlmsg);
  netlink_done(nlmsg);
  int ifindex = if_nametoindex(link);
  netlink_attr(nlmsg, IFLA_LINK, &ifindex, sizeof(ifindex));
  int err = netlink_send(nlmsg, sock);
  if (err < 0) {
  }
}

static void netlink_add_geneve(struct nlmsg* nlmsg, int sock, const char* name,
                               uint32_t vni, struct in_addr* addr4,
                               struct in6_addr* addr6)
{
  netlink_add_device_impl(nlmsg, "geneve", name, false);
  netlink_nest(nlmsg, IFLA_INFO_DATA);
  netlink_attr(nlmsg, IFLA_GENEVE_ID, &vni, sizeof(vni));
  if (addr4)
    netlink_attr(nlmsg, IFLA_GENEVE_REMOTE, addr4, sizeof(*addr4));
  if (addr6)
    netlink_attr(nlmsg, IFLA_GENEVE_REMOTE6, addr6, sizeof(*addr6));
  netlink_done(nlmsg);
  netlink_done(nlmsg);
  int err = netlink_send(nlmsg, sock);
  if (err < 0) {
  }
}

#define IFLA_IPVLAN_FLAGS 2
#define IPVLAN_MODE_L3S 2
#undef IPVLAN_F_VEPA
#define IPVLAN_F_VEPA 2

static void netlink_add_ipvlan(struct nlmsg* nlmsg, int sock, const char* name,
                               const char* link, uint16_t mode, uint16_t flags)
{
  netlink_add_device_impl(nlmsg, "ipvlan", name, false);
  netlink_nest(nlmsg, IFLA_INFO_DATA);
  netlink_attr(nlmsg, IFLA_IPVLAN_MODE, &mode, sizeof(mode));
  netlink_attr(nlmsg, IFLA_IPVLAN_FLAGS, &flags, sizeof(flags));
  netlink_done(nlmsg);
  netlink_done(nlmsg);
  int ifindex = if_nametoindex(link);
  netlink_attr(nlmsg, IFLA_LINK, &ifindex, sizeof(ifindex));
  int err = netlink_send(nlmsg, sock);
  if (err < 0) {
  }
}

static void netlink_device_change(struct nlmsg* nlmsg, int sock,
                                  const char* name, bool up, const char* master,
                                  const void* mac, int macsize,
                                  const char* new_name)
{
  struct ifinfomsg hdr;
  memset(&hdr, 0, sizeof(hdr));
  if (up)
    hdr.ifi_flags = hdr.ifi_change = IFF_UP;
  hdr.ifi_index = if_nametoindex(name);
  netlink_init(nlmsg, RTM_NEWLINK, 0, &hdr, sizeof(hdr));
  if (new_name)
    netlink_attr(nlmsg, IFLA_IFNAME, new_name, strlen(new_name));
  if (master) {
    int ifindex = if_nametoindex(master);
    netlink_attr(nlmsg, IFLA_MASTER, &ifindex, sizeof(ifindex));
  }
  if (macsize)
    netlink_attr(nlmsg, IFLA_ADDRESS, mac, macsize);
  int err = netlink_send(nlmsg, sock);
  if (err < 0) {
  }
}

static int netlink_add_addr(struct nlmsg* nlmsg, int sock, const char* dev,
                            const void* addr, int addrsize)
{
  struct ifaddrmsg hdr;
  memset(&hdr, 0, sizeof(hdr));
  hdr.ifa_family = addrsize == 4 ? AF_INET : AF_INET6;
  hdr.ifa_prefixlen = addrsize == 4 ? 24 : 120;
  hdr.ifa_scope = RT_SCOPE_UNIVERSE;
  hdr.ifa_index = if_nametoindex(dev);
  netlink_init(nlmsg, RTM_NEWADDR, NLM_F_CREATE | NLM_F_REPLACE, &hdr,
               sizeof(hdr));
  netlink_attr(nlmsg, IFA_LOCAL, addr, addrsize);
  netlink_attr(nlmsg, IFA_ADDRESS, addr, addrsize);
  return netlink_send(nlmsg, sock);
}

static void netlink_add_addr4(struct nlmsg* nlmsg, int sock, const char* dev,
                              const char* addr)
{
  struct in_addr in_addr;
  inet_pton(AF_INET, addr, &in_addr);
  int err = netlink_add_addr(nlmsg, sock, dev, &in_addr, sizeof(in_addr));
  if (err < 0) {
  }
}

static void netlink_add_addr6(struct nlmsg* nlmsg, int sock, const char* dev,
                              const char* addr)
{
  struct in6_addr in6_addr;
  inet_pton(AF_INET6, addr, &in6_addr);
  int err = netlink_add_addr(nlmsg, sock, dev, &in6_addr, sizeof(in6_addr));
  if (err < 0) {
  }
}

static void netlink_add_neigh(struct nlmsg* nlmsg, int sock, const char* name,
                              const void* addr, int addrsize, const void* mac,
                              int macsize)
{
  struct ndmsg hdr;
  memset(&hdr, 0, sizeof(hdr));
  hdr.ndm_family = addrsize == 4 ? AF_INET : AF_INET6;
  hdr.ndm_ifindex = if_nametoindex(name);
  hdr.ndm_state = NUD_PERMANENT;
  netlink_init(nlmsg, RTM_NEWNEIGH, NLM_F_EXCL | NLM_F_CREATE, &hdr,
               sizeof(hdr));
  netlink_attr(nlmsg, NDA_DST, addr, addrsize);
  netlink_attr(nlmsg, NDA_LLADDR, mac, macsize);
  int err = netlink_send(nlmsg, sock);
  if (err < 0) {
  }
}

static struct nlmsg nlmsg;

static int tunfd = -1;

#define TUN_IFACE "syz_tun"
#define LOCAL_MAC 0xaaaaaaaaaaaa
#define REMOTE_MAC 0xaaaaaaaaaabb
#define LOCAL_IPV4 "172.20.20.170"
#define REMOTE_IPV4 "172.20.20.187"
#define LOCAL_IPV6 "fe80::aa"
#define REMOTE_IPV6 "fe80::bb"

#define IFF_NAPI 0x0010
static void correct_dev_net_tun(void)
{
  struct stat st;
  if (stat("/dev/net/tun", &st) == 0) {
    if (S_ISCHR(st.st_mode) && major(st.st_rdev) == 10 &&
        minor(st.st_rdev) == 200)
      return;
    if (unlink("/dev/net/tun")) {
    }
  }
  if (mkdir("/dev/net", 0755) && errno != EEXIST) {
  }
  if (mknod("/dev/net/tun", S_IFCHR | 0666, makedev(10, 200))) {
  }
  if (chmod("/dev/net/tun", 0666)) {
  }
}

static void initialize_tun(void)
{
  correct_dev_net_tun();
  tunfd = open("/dev/net/tun", O_RDWR | O_NONBLOCK);
  if (tunfd == -1) {
    printf("tun: can't open /dev/net/tun: please enable CONFIG_TUN=y\n");
    printf("otherwise fuzzing or reproducing might not work as intended\n");
    return;
  }
  const int kTunFd = 200;
  if (dup2(tunfd, kTunFd) < 0)
    exit(1);
  close(tunfd);
  tunfd = kTunFd;
  struct ifreq ifr;
  memset(&ifr, 0, sizeof(ifr));
  strncpy(ifr.ifr_name, TUN_IFACE, IFNAMSIZ);
  ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
  if (ioctl(tunfd, TUNSETIFF, (void*)&ifr) < 0) {
    exit(1);
  }
  char sysctl[64];
  sprintf(sysctl, "/proc/sys/net/ipv6/conf/%s/accept_dad", TUN_IFACE);
  write_file(sysctl, "0");
  sprintf(sysctl, "/proc/sys/net/ipv6/conf/%s/router_solicitations", TUN_IFACE);
  write_file(sysctl, "0");
  int sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
  if (sock == -1)
    exit(1);
  netlink_add_addr4(&nlmsg, sock, TUN_IFACE, LOCAL_IPV4);
  netlink_add_addr6(&nlmsg, sock, TUN_IFACE, LOCAL_IPV6);
  uint64_t macaddr = REMOTE_MAC;
  struct in_addr in_addr;
  inet_pton(AF_INET, REMOTE_IPV4, &in_addr);
  netlink_add_neigh(&nlmsg, sock, TUN_IFACE, &in_addr, sizeof(in_addr),
                    &macaddr, ETH_ALEN);
  struct in6_addr in6_addr;
  inet_pton(AF_INET6, REMOTE_IPV6, &in6_addr);
  netlink_add_neigh(&nlmsg, sock, TUN_IFACE, &in6_addr, sizeof(in6_addr),
                    &macaddr, ETH_ALEN);
  macaddr = LOCAL_MAC;
  netlink_device_change(&nlmsg, sock, TUN_IFACE, true, 0, &macaddr, ETH_ALEN,
                        NULL);
  close(sock);
}

#define DEVLINK_FAMILY_NAME "devlink"

#define DEVLINK_CMD_PORT_GET 5
#define DEVLINK_ATTR_BUS_NAME 1
#define DEVLINK_ATTR_DEV_NAME 2
#define DEVLINK_ATTR_NETDEV_NAME 7

static struct nlmsg nlmsg2;

static void initialize_devlink_ports(const char* bus_name, const char* dev_name,
                                     const char* netdev_prefix)
{
  struct genlmsghdr genlhdr;
  int len, total_len, id, err, offset;
  uint16_t netdev_index;
  int sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC);
  if (sock == -1)
    exit(1);
  int rtsock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
  if (rtsock == -1)
    exit(1);
  id = netlink_query_family_id(&nlmsg, sock, DEVLINK_FAMILY_NAME, true);
  if (id == -1)
    goto error;
  memset(&genlhdr, 0, sizeof(genlhdr));
  genlhdr.cmd = DEVLINK_CMD_PORT_GET;
  netlink_init(&nlmsg, id, NLM_F_DUMP, &genlhdr, sizeof(genlhdr));
  netlink_attr(&nlmsg, DEVLINK_ATTR_BUS_NAME, bus_name, strlen(bus_name) + 1);
  netlink_attr(&nlmsg, DEVLINK_ATTR_DEV_NAME, dev_name, strlen(dev_name) + 1);
  err = netlink_send_ext(&nlmsg, sock, id, &total_len, true);
  if (err < 0) {
    goto error;
  }
  offset = 0;
  netdev_index = 0;
  while ((len = netlink_next_msg(&nlmsg, offset, total_len)) != -1) {
    struct nlattr* attr = (struct nlattr*)(nlmsg.buf + offset + NLMSG_HDRLEN +
                                           NLMSG_ALIGN(sizeof(genlhdr)));
    for (; (char*)attr < nlmsg.buf + offset + len;
         attr = (struct nlattr*)((char*)attr + NLMSG_ALIGN(attr->nla_len))) {
      if (attr->nla_type == DEVLINK_ATTR_NETDEV_NAME) {
        char* port_name;
        char netdev_name[IFNAMSIZ];
        port_name = (char*)(attr + 1);
        snprintf(netdev_name, sizeof(netdev_name), "%s%d", netdev_prefix,
                 netdev_index);
        netlink_device_change(&nlmsg2, rtsock, port_name, true, 0, 0, 0,
                              netdev_name);
        break;
      }
    }
    offset += len;
    netdev_index++;
  }
error:
  close(rtsock);
  close(sock);
}

#define DEV_IPV4 "172.20.20.%d"
#define DEV_IPV6 "fe80::%02x"
#define DEV_MAC 0x00aaaaaaaaaa

static void netdevsim_add(unsigned int addr, unsigned int port_count)
{
  write_file("/sys/bus/netdevsim/del_device", "%u", addr);
  if (write_file("/sys/bus/netdevsim/new_device", "%u %u", addr, port_count)) {
    char buf[32];
    snprintf(buf, sizeof(buf), "netdevsim%d", addr);
    initialize_devlink_ports("netdevsim", buf, "netdevsim");
  }
}

#define WG_GENL_NAME "wireguard"
enum wg_cmd {
  WG_CMD_GET_DEVICE,
  WG_CMD_SET_DEVICE,
};
enum wgdevice_attribute {
  WGDEVICE_A_UNSPEC,
  WGDEVICE_A_IFINDEX,
  WGDEVICE_A_IFNAME,
  WGDEVICE_A_PRIVATE_KEY,
  WGDEVICE_A_PUBLIC_KEY,
  WGDEVICE_A_FLAGS,
  WGDEVICE_A_LISTEN_PORT,
  WGDEVICE_A_FWMARK,
  WGDEVICE_A_PEERS,
};
enum wgpeer_attribute {
  WGPEER_A_UNSPEC,
  WGPEER_A_PUBLIC_KEY,
  WGPEER_A_PRESHARED_KEY,
  WGPEER_A_FLAGS,
  WGPEER_A_ENDPOINT,
  WGPEER_A_PERSISTENT_KEEPALIVE_INTERVAL,
  WGPEER_A_LAST_HANDSHAKE_TIME,
  WGPEER_A_RX_BYTES,
  WGPEER_A_TX_BYTES,
  WGPEER_A_ALLOWEDIPS,
  WGPEER_A_PROTOCOL_VERSION,
};
enum wgallowedip_attribute {
  WGALLOWEDIP_A_UNSPEC,
  WGALLOWEDIP_A_FAMILY,
  WGALLOWEDIP_A_IPADDR,
  WGALLOWEDIP_A_CIDR_MASK,
};

static void netlink_wireguard_setup(void)
{
  const char ifname_a[] = "wg0";
  const char ifname_b[] = "wg1";
  const char ifname_c[] = "wg2";
  const char private_a[] =
      "\xa0\x5c\xa8\x4f\x6c\x9c\x8e\x38\x53\xe2\xfd\x7a\x70\xae\x0f\xb2\x0f\xa1"
      "\x52\x60\x0c\xb0\x08\x45\x17\x4f\x08\x07\x6f\x8d\x78\x43";
  const char private_b[] =
      "\xb0\x80\x73\xe8\xd4\x4e\x91\xe3\xda\x92\x2c\x22\x43\x82\x44\xbb\x88\x5c"
      "\x69\xe2\x69\xc8\xe9\xd8\x35\xb1\x14\x29\x3a\x4d\xdc\x6e";
  const char private_c[] =
      "\xa0\xcb\x87\x9a\x47\xf5\xbc\x64\x4c\x0e\x69\x3f\xa6\xd0\x31\xc7\x4a\x15"
      "\x53\xb6\xe9\x01\xb9\xff\x2f\x51\x8c\x78\x04\x2f\xb5\x42";
  const char public_a[] =
      "\x97\x5c\x9d\x81\xc9\x83\xc8\x20\x9e\xe7\x81\x25\x4b\x89\x9f\x8e\xd9\x25"
      "\xae\x9f\x09\x23\xc2\x3c\x62\xf5\x3c\x57\xcd\xbf\x69\x1c";
  const char public_b[] =
      "\xd1\x73\x28\x99\xf6\x11\xcd\x89\x94\x03\x4d\x7f\x41\x3d\xc9\x57\x63\x0e"
      "\x54\x93\xc2\x85\xac\xa4\x00\x65\xcb\x63\x11\xbe\x69\x6b";
  const char public_c[] =
      "\xf4\x4d\xa3\x67\xa8\x8e\xe6\x56\x4f\x02\x02\x11\x45\x67\x27\x08\x2f\x5c"
      "\xeb\xee\x8b\x1b\xf5\xeb\x73\x37\x34\x1b\x45\x9b\x39\x22";
  const uint16_t listen_a = 20001;
  const uint16_t listen_b = 20002;
  const uint16_t listen_c = 20003;
  const uint16_t af_inet = AF_INET;
  const uint16_t af_inet6 = AF_INET6;
  const struct sockaddr_in endpoint_b_v4 = {
      .sin_family = AF_INET,
      .sin_port = htons(listen_b),
      .sin_addr = {htonl(INADDR_LOOPBACK)}};
  const struct sockaddr_in endpoint_c_v4 = {
      .sin_family = AF_INET,
      .sin_port = htons(listen_c),
      .sin_addr = {htonl(INADDR_LOOPBACK)}};
  struct sockaddr_in6 endpoint_a_v6 = {.sin6_family = AF_INET6,
                                       .sin6_port = htons(listen_a)};
  endpoint_a_v6.sin6_addr = in6addr_loopback;
  struct sockaddr_in6 endpoint_c_v6 = {.sin6_family = AF_INET6,
                                       .sin6_port = htons(listen_c)};
  endpoint_c_v6.sin6_addr = in6addr_loopback;
  const struct in_addr first_half_v4 = {0};
  const struct in_addr second_half_v4 = {(uint32_t)htonl(128 << 24)};
  const struct in6_addr first_half_v6 = {{{0}}};
  const struct in6_addr second_half_v6 = {{{0x80}}};
  const uint8_t half_cidr = 1;
  const uint16_t persistent_keepalives[] = {1, 3, 7, 9, 14, 19};
  struct genlmsghdr genlhdr = {.cmd = WG_CMD_SET_DEVICE, .version = 1};
  int sock;
  int id, err;
  sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC);
  if (sock == -1) {
    return;
  }
  id = netlink_query_family_id(&nlmsg, sock, WG_GENL_NAME, true);
  if (id == -1)
    goto error;
  netlink_init(&nlmsg, id, 0, &genlhdr, sizeof(genlhdr));
  netlink_attr(&nlmsg, WGDEVICE_A_IFNAME, ifname_a, strlen(ifname_a) + 1);
  netlink_attr(&nlmsg, WGDEVICE_A_PRIVATE_KEY, private_a, 32);
  netlink_attr(&nlmsg, WGDEVICE_A_LISTEN_PORT, &listen_a, 2);
  netlink_nest(&nlmsg, NLA_F_NESTED | WGDEVICE_A_PEERS);
  netlink_nest(&nlmsg, NLA_F_NESTED | 0);
  netlink_attr(&nlmsg, WGPEER_A_PUBLIC_KEY, public_b, 32);
  netlink_attr(&nlmsg, WGPEER_A_ENDPOINT, &endpoint_b_v4,
               sizeof(endpoint_b_v4));
  netlink_attr(&nlmsg, WGPEER_A_PERSISTENT_KEEPALIVE_INTERVAL,
               &persistent_keepalives[0], 2);
  netlink_nest(&nlmsg, NLA_F_NESTED | WGPEER_A_ALLOWEDIPS);
  netlink_nest(&nlmsg, NLA_F_NESTED | 0);
  netlink_attr(&nlmsg, WGALLOWEDIP_A_FAMILY, &af_inet, 2);
  netlink_attr(&nlmsg, WGALLOWEDIP_A_IPADDR, &first_half_v4,
               sizeof(first_half_v4));
  netlink_attr(&nlmsg, WGALLOWEDIP_A_CIDR_MASK, &half_cidr, 1);
  netlink_done(&nlmsg);
  netlink_nest(&nlmsg, NLA_F_NESTED | 0);
  netlink_attr(&nlmsg, WGALLOWEDIP_A_FAMILY, &af_inet6, 2);
  netlink_attr(&nlmsg, WGALLOWEDIP_A_IPADDR, &first_half_v6,
               sizeof(first_half_v6));
  netlink_attr(&nlmsg, WGALLOWEDIP_A_CIDR_MASK, &half_cidr, 1);
  netlink_done(&nlmsg);
  netlink_done(&nlmsg);
  netlink_done(&nlmsg);
  netlink_nest(&nlmsg, NLA_F_NESTED | 0);
  netlink_attr(&nlmsg, WGPEER_A_PUBLIC_KEY, public_c, 32);
  netlink_attr(&nlmsg, WGPEER_A_ENDPOINT, &endpoint_c_v6,
               sizeof(endpoint_c_v6));
  netlink_attr(&nlmsg, WGPEER_A_PERSISTENT_KEEPALIVE_INTERVAL,
               &persistent_keepalives[1], 2);
  netlink_nest(&nlmsg, NLA_F_NESTED | WGPEER_A_ALLOWEDIPS);
  netlink_nest(&nlmsg, NLA_F_NESTED | 0);
  netlink_attr(&nlmsg, WGALLOWEDIP_A_FAMILY, &af_inet, 2);
  netlink_attr(&nlmsg, WGALLOWEDIP_A_IPADDR, &second_half_v4,
               sizeof(second_half_v4));
  netlink_attr(&nlmsg, WGALLOWEDIP_A_CIDR_MASK, &half_cidr, 1);
  netlink_done(&nlmsg);
  netlink_nest(&nlmsg, NLA_F_NESTED | 0);
  netlink_attr(&nlmsg, WGALLOWEDIP_A_FAMILY, &af_inet6, 2);
  netlink_attr(&nlmsg, WGALLOWEDIP_A_IPADDR, &second_half_v6,
               sizeof(second_half_v6));
  netlink_attr(&nlmsg, WGALLOWEDIP_A_CIDR_MASK, &half_cidr, 1);
  netlink_done(&nlmsg);
  netlink_done(&nlmsg);
  netlink_done(&nlmsg);
  netlink_done(&nlmsg);
  err = netlink_send(&nlmsg, sock);
  if (err < 0) {
  }
  netlink_init(&nlmsg, id, 0, &genlhdr, sizeof(genlhdr));
  netlink_attr(&nlmsg, WGDEVICE_A_IFNAME, ifname_b, strlen(ifname_b) + 1);
  netlink_attr(&nlmsg, WGDEVICE_A_PRIVATE_KEY, private_b, 32);
  netlink_attr(&nlmsg, WGDEVICE_A_LISTEN_PORT, &listen_b, 2);
  netlink_nest(&nlmsg, NLA_F_NESTED | WGDEVICE_A_PEERS);
  netlink_nest(&nlmsg, NLA_F_NESTED | 0);
  netlink_attr(&nlmsg, WGPEER_A_PUBLIC_KEY, public_a, 32);
  netlink_attr(&nlmsg, WGPEER_A_ENDPOINT, &endpoint_a_v6,
               sizeof(endpoint_a_v6));
  netlink_attr(&nlmsg, WGPEER_A_PERSISTENT_KEEPALIVE_INTERVAL,
               &persistent_keepalives[2], 2);
  netlink_nest(&nlmsg, NLA_F_NESTED | WGPEER_A_ALLOWEDIPS);
  netlink_nest(&nlmsg, NLA_F_NESTED | 0);
  netlink_attr(&nlmsg, WGALLOWEDIP_A_FAMILY, &af_inet, 2);
  netlink_attr(&nlmsg, WGALLOWEDIP_A_IPADDR, &first_half_v4,
               sizeof(first_half_v4));
  netlink_attr(&nlmsg, WGALLOWEDIP_A_CIDR_MASK, &half_cidr, 1);
  netlink_done(&nlmsg);
  netlink_nest(&nlmsg, NLA_F_NESTED | 0);
  netlink_attr(&nlmsg, WGALLOWEDIP_A_FAMILY, &af_inet6, 2);
  netlink_attr(&nlmsg, WGALLOWEDIP_A_IPADDR, &first_half_v6,
               sizeof(first_half_v6));
  netlink_attr(&nlmsg, WGALLOWEDIP_A_CIDR_MASK, &half_cidr, 1);
  netlink_done(&nlmsg);
  netlink_done(&nlmsg);
  netlink_done(&nlmsg);
  netlink_nest(&nlmsg, NLA_F_NESTED | 0);
  netlink_attr(&nlmsg, WGPEER_A_PUBLIC_KEY, public_c, 32);
  netlink_attr(&nlmsg, WGPEER_A_ENDPOINT, &endpoint_c_v4,
               sizeof(endpoint_c_v4));
  netlink_attr(&nlmsg, WGPEER_A_PERSISTENT_KEEPALIVE_INTERVAL,
               &persistent_keepalives[3], 2);
  netlink_nest(&nlmsg, NLA_F_NESTED | WGPEER_A_ALLOWEDIPS);
  netlink_nest(&nlmsg, NLA_F_NESTED | 0);
  netlink_attr(&nlmsg, WGALLOWEDIP_A_FAMILY, &af_inet, 2);
  netlink_attr(&nlmsg, WGALLOWEDIP_A_IPADDR, &second_half_v4,
               sizeof(second_half_v4));
  netlink_attr(&nlmsg, WGALLOWEDIP_A_CIDR_MASK, &half_cidr, 1);
  netlink_done(&nlmsg);
  netlink_nest(&nlmsg, NLA_F_NESTED | 0);
  netlink_attr(&nlmsg, WGALLOWEDIP_A_FAMILY, &af_inet6, 2);
  netlink_attr(&nlmsg, WGALLOWEDIP_A_IPADDR, &second_half_v6,
               sizeof(second_half_v6));
  netlink_attr(&nlmsg, WGALLOWEDIP_A_CIDR_MASK, &half_cidr, 1);
  netlink_done(&nlmsg);
  netlink_done(&nlmsg);
  netlink_done(&nlmsg);
  netlink_done(&nlmsg);
  err = netlink_send(&nlmsg, sock);
  if (err < 0) {
  }
  netlink_init(&nlmsg, id, 0, &genlhdr, sizeof(genlhdr));
  netlink_attr(&nlmsg, WGDEVICE_A_IFNAME, ifname_c, strlen(ifname_c) + 1);
  netlink_attr(&nlmsg, WGDEVICE_A_PRIVATE_KEY, private_c, 32);
  netlink_attr(&nlmsg, WGDEVICE_A_LISTEN_PORT, &listen_c, 2);
  netlink_nest(&nlmsg, NLA_F_NESTED | WGDEVICE_A_PEERS);
  netlink_nest(&nlmsg, NLA_F_NESTED | 0);
  netlink_attr(&nlmsg, WGPEER_A_PUBLIC_KEY, public_a, 32);
  netlink_attr(&nlmsg, WGPEER_A_ENDPOINT, &endpoint_a_v6,
               sizeof(endpoint_a_v6));
  netlink_attr(&nlmsg, WGPEER_A_PERSISTENT_KEEPALIVE_INTERVAL,
               &persistent_keepalives[4], 2);
  netlink_nest(&nlmsg, NLA_F_NESTED | WGPEER_A_ALLOWEDIPS);
  netlink_nest(&nlmsg, NLA_F_NESTED | 0);
  netlink_attr(&nlmsg, WGALLOWEDIP_A_FAMILY, &af_inet, 2);
  netlink_attr(&nlmsg, WGALLOWEDIP_A_IPADDR, &first_half_v4,
               sizeof(first_half_v4));
  netlink_attr(&nlmsg, WGALLOWEDIP_A_CIDR_MASK, &half_cidr, 1);
  netlink_done(&nlmsg);
  netlink_nest(&nlmsg, NLA_F_NESTED | 0);
  netlink_attr(&nlmsg, WGALLOWEDIP_A_FAMILY, &af_inet6, 2);
  netlink_attr(&nlmsg, WGALLOWEDIP_A_IPADDR, &first_half_v6,
               sizeof(first_half_v6));
  netlink_attr(&nlmsg, WGALLOWEDIP_A_CIDR_MASK, &half_cidr, 1);
  netlink_done(&nlmsg);
  netlink_done(&nlmsg);
  netlink_done(&nlmsg);
  netlink_nest(&nlmsg, NLA_F_NESTED | 0);
  netlink_attr(&nlmsg, WGPEER_A_PUBLIC_KEY, public_b, 32);
  netlink_attr(&nlmsg, WGPEER_A_ENDPOINT, &endpoint_b_v4,
               sizeof(endpoint_b_v4));
  netlink_attr(&nlmsg, WGPEER_A_PERSISTENT_KEEPALIVE_INTERVAL,
               &persistent_keepalives[5], 2);
  netlink_nest(&nlmsg, NLA_F_NESTED | WGPEER_A_ALLOWEDIPS);
  netlink_nest(&nlmsg, NLA_F_NESTED | 0);
  netlink_attr(&nlmsg, WGALLOWEDIP_A_FAMILY, &af_inet, 2);
  netlink_attr(&nlmsg, WGALLOWEDIP_A_IPADDR, &second_half_v4,
               sizeof(second_half_v4));
  netlink_attr(&nlmsg, WGALLOWEDIP_A_CIDR_MASK, &half_cidr, 1);
  netlink_done(&nlmsg);
  netlink_nest(&nlmsg, NLA_F_NESTED | 0);
  netlink_attr(&nlmsg, WGALLOWEDIP_A_FAMILY, &af_inet6, 2);
  netlink_attr(&nlmsg, WGALLOWEDIP_A_IPADDR, &second_half_v6,
               sizeof(second_half_v6));
  netlink_attr(&nlmsg, WGALLOWEDIP_A_CIDR_MASK, &half_cidr, 1);
  netlink_done(&nlmsg);
  netlink_done(&nlmsg);
  netlink_done(&nlmsg);
  netlink_done(&nlmsg);
  err = netlink_send(&nlmsg, sock);
  if (err < 0) {
  }

error:
  close(sock);
}

static void initialize_netdevices(void)
{
  char netdevsim[16];
  sprintf(netdevsim, "netdevsim%d", (int)procid);
  struct {
    const char* type;
    const char* dev;
  } devtypes[] = {
      {"ip6gretap", "ip6gretap0"}, {"bridge", "bridge0"}, {"vcan", "vcan0"},
      {"bond", "bond0"},           {"team", "team0"},     {"dummy", "dummy0"},
      {"nlmon", "nlmon0"},         {"caif", "caif0"},     {"batadv", "batadv0"},
      {"vxcan", "vxcan1"},         {"veth", 0},           {"wireguard", "wg0"},
      {"wireguard", "wg1"},        {"wireguard", "wg2"},
  };
  const char* devmasters[] = {"bridge", "bond", "team", "batadv"};
  struct {
    const char* name;
    int macsize;
    bool noipv6;
  } devices[] = {
      {"lo", ETH_ALEN},
      {"sit0", 0},
      {"bridge0", ETH_ALEN},
      {"vcan0", 0, true},
      {"tunl0", 0},
      {"gre0", 0},
      {"gretap0", ETH_ALEN},
      {"ip_vti0", 0},
      {"ip6_vti0", 0},
      {"ip6tnl0", 0},
      {"ip6gre0", 0},
      {"ip6gretap0", ETH_ALEN},
      {"erspan0", ETH_ALEN},
      {"bond0", ETH_ALEN},
      {"veth0", ETH_ALEN},
      {"veth1", ETH_ALEN},
      {"team0", ETH_ALEN},
      {"veth0_to_bridge", ETH_ALEN},
      {"veth1_to_bridge", ETH_ALEN},
      {"veth0_to_bond", ETH_ALEN},
      {"veth1_to_bond", ETH_ALEN},
      {"veth0_to_team", ETH_ALEN},
      {"veth1_to_team", ETH_ALEN},
      {"veth0_to_hsr", ETH_ALEN},
      {"veth1_to_hsr", ETH_ALEN},
      {"hsr0", 0},
      {"dummy0", ETH_ALEN},
      {"nlmon0", 0},
      {"vxcan0", 0, true},
      {"vxcan1", 0, true},
      {"caif0", ETH_ALEN},
      {"batadv0", ETH_ALEN},
      {netdevsim, ETH_ALEN},
      {"xfrm0", ETH_ALEN},
      {"veth0_virt_wifi", ETH_ALEN},
      {"veth1_virt_wifi", ETH_ALEN},
      {"virt_wifi0", ETH_ALEN},
      {"veth0_vlan", ETH_ALEN},
      {"veth1_vlan", ETH_ALEN},
      {"vlan0", ETH_ALEN},
      {"vlan1", ETH_ALEN},
      {"macvlan0", ETH_ALEN},
      {"macvlan1", ETH_ALEN},
      {"ipvlan0", ETH_ALEN},
      {"ipvlan1", ETH_ALEN},
      {"veth0_macvtap", ETH_ALEN},
      {"veth1_macvtap", ETH_ALEN},
      {"macvtap0", ETH_ALEN},
      {"macsec0", ETH_ALEN},
      {"veth0_to_batadv", ETH_ALEN},
      {"veth1_to_batadv", ETH_ALEN},
      {"batadv_slave_0", ETH_ALEN},
      {"batadv_slave_1", ETH_ALEN},
      {"geneve0", ETH_ALEN},
      {"geneve1", ETH_ALEN},
      {"wg0", 0},
      {"wg1", 0},
      {"wg2", 0},
  };
  int sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
  if (sock == -1)
    exit(1);
  unsigned i;
  for (i = 0; i < sizeof(devtypes) / sizeof(devtypes[0]); i++)
    netlink_add_device(&nlmsg, sock, devtypes[i].type, devtypes[i].dev);
  for (i = 0; i < sizeof(devmasters) / (sizeof(devmasters[0])); i++) {
    char master[32], slave0[32], veth0[32], slave1[32], veth1[32];
    sprintf(slave0, "%s_slave_0", devmasters[i]);
    sprintf(veth0, "veth0_to_%s", devmasters[i]);
    netlink_add_veth(&nlmsg, sock, slave0, veth0);
    sprintf(slave1, "%s_slave_1", devmasters[i]);
    sprintf(veth1, "veth1_to_%s", devmasters[i]);
    netlink_add_veth(&nlmsg, sock, slave1, veth1);
    sprintf(master, "%s0", devmasters[i]);
    netlink_device_change(&nlmsg, sock, slave0, false, master, 0, 0, NULL);
    netlink_device_change(&nlmsg, sock, slave1, false, master, 0, 0, NULL);
  }
  netlink_add_xfrm(&nlmsg, sock, "xfrm0");
  netlink_device_change(&nlmsg, sock, "bridge_slave_0", true, 0, 0, 0, NULL);
  netlink_device_change(&nlmsg, sock, "bridge_slave_1", true, 0, 0, 0, NULL);
  netlink_add_veth(&nlmsg, sock, "hsr_slave_0", "veth0_to_hsr");
  netlink_add_veth(&nlmsg, sock, "hsr_slave_1", "veth1_to_hsr");
  netlink_add_hsr(&nlmsg, sock, "hsr0", "hsr_slave_0", "hsr_slave_1");
  netlink_device_change(&nlmsg, sock, "hsr_slave_0", true, 0, 0, 0, NULL);
  netlink_device_change(&nlmsg, sock, "hsr_slave_1", true, 0, 0, 0, NULL);
  netlink_add_veth(&nlmsg, sock, "veth0_virt_wifi", "veth1_virt_wifi");
  netlink_add_linked(&nlmsg, sock, "virt_wifi", "virt_wifi0",
                     "veth1_virt_wifi");
  netlink_add_veth(&nlmsg, sock, "veth0_vlan", "veth1_vlan");
  netlink_add_vlan(&nlmsg, sock, "vlan0", "veth0_vlan", 0, htons(ETH_P_8021Q));
  netlink_add_vlan(&nlmsg, sock, "vlan1", "veth0_vlan", 1, htons(ETH_P_8021AD));
  netlink_add_macvlan(&nlmsg, sock, "macvlan0", "veth1_vlan");
  netlink_add_macvlan(&nlmsg, sock, "macvlan1", "veth1_vlan");
  netlink_add_ipvlan(&nlmsg, sock, "ipvlan0", "veth0_vlan", IPVLAN_MODE_L2, 0);
  netlink_add_ipvlan(&nlmsg, sock, "ipvlan1", "veth0_vlan", IPVLAN_MODE_L3S,
                     IPVLAN_F_VEPA);
  netlink_add_veth(&nlmsg, sock, "veth0_macvtap", "veth1_macvtap");
  netlink_add_linked(&nlmsg, sock, "macvtap", "macvtap0", "veth0_macvtap");
  netlink_add_linked(&nlmsg, sock, "macsec", "macsec0", "veth1_macvtap");
  char addr[32];
  sprintf(addr, DEV_IPV4, 14 + 10);
  struct in_addr geneve_addr4;
  if (inet_pton(AF_INET, addr, &geneve_addr4) <= 0)
    exit(1);
  struct in6_addr geneve_addr6;
  if (inet_pton(AF_INET6, "fc00::01", &geneve_addr6) <= 0)
    exit(1);
  netlink_add_geneve(&nlmsg, sock, "geneve0", 0, &geneve_addr4, 0);
  netlink_add_geneve(&nlmsg, sock, "geneve1", 1, 0, &geneve_addr6);
  netdevsim_add((int)procid, 4);
  netlink_wireguard_setup();
  for (i = 0; i < sizeof(devices) / (sizeof(devices[0])); i++) {
    char addr[32];
    sprintf(addr, DEV_IPV4, i + 10);
    netlink_add_addr4(&nlmsg, sock, devices[i].name, addr);
    if (!devices[i].noipv6) {
      sprintf(addr, DEV_IPV6, i + 10);
      netlink_add_addr6(&nlmsg, sock, devices[i].name, addr);
    }
    uint64_t macaddr = DEV_MAC + ((i + 10ull) << 40);
    netlink_device_change(&nlmsg, sock, devices[i].name, true, 0, &macaddr,
                          devices[i].macsize, NULL);
  }
  close(sock);
}
static void initialize_netdevices_init(void)
{
  int sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
  if (sock == -1)
    exit(1);
  struct {
    const char* type;
    int macsize;
    bool noipv6;
    bool noup;
  } devtypes[] = {
      {"nr", 7, true},
      {"rose", 5, true, true},
  };
  unsigned i;
  for (i = 0; i < sizeof(devtypes) / sizeof(devtypes[0]); i++) {
    char dev[32], addr[32];
    sprintf(dev, "%s%d", devtypes[i].type, (int)procid);
    sprintf(addr, "172.30.%d.%d", i, (int)procid + 1);
    netlink_add_addr4(&nlmsg, sock, dev, addr);
    if (!devtypes[i].noipv6) {
      sprintf(addr, "fe88::%02x:%02x", i, (int)procid + 1);
      netlink_add_addr6(&nlmsg, sock, dev, addr);
    }
    int macsize = devtypes[i].macsize;
    uint64_t macaddr = 0xbbbbbb +
                       ((unsigned long long)i << (8 * (macsize - 2))) +
                       (procid << (8 * (macsize - 1)));
    netlink_device_change(&nlmsg, sock, dev, !devtypes[i].noup, 0, &macaddr,
                          macsize, NULL);
  }
  close(sock);
}

static long syz_emit_ethernet(volatile long a0, volatile long a1,
                              volatile long a2)
{
  if (tunfd < 0)
    return (uintptr_t)-1;
  uint32_t length = a0;
  char* data = (char*)a1;
  return write(tunfd, data, length);
}

static void setup_gadgetfs();
static void setup_binderfs();
static void setup_fusectl();
static void sandbox_common_mount_tmpfs(void)
{
  write_file("/proc/sys/fs/mount-max", "100000");
  if (mkdir("./syz-tmp", 0777))
    exit(1);
  if (mount("", "./syz-tmp", "tmpfs", 0, NULL))
    exit(1);
  if (mkdir("./syz-tmp/newroot", 0777))
    exit(1);
  if (mkdir("./syz-tmp/newroot/dev", 0700))
    exit(1);
  unsigned bind_mount_flags = MS_BIND | MS_REC | MS_PRIVATE;
  if (mount("/dev", "./syz-tmp/newroot/dev", NULL, bind_mount_flags, NULL))
    exit(1);
  if (mkdir("./syz-tmp/newroot/proc", 0700))
    exit(1);
  if (mount("syz-proc", "./syz-tmp/newroot/proc", "proc", 0, NULL))
    exit(1);
  if (mkdir("./syz-tmp/newroot/selinux", 0700))
    exit(1);
  const char* selinux_path = "./syz-tmp/newroot/selinux";
  if (mount("/selinux", selinux_path, NULL, bind_mount_flags, NULL)) {
    if (errno != ENOENT)
      exit(1);
    if (mount("/sys/fs/selinux", selinux_path, NULL, bind_mount_flags, NULL) &&
        errno != ENOENT)
      exit(1);
  }
  if (mkdir("./syz-tmp/newroot/sys", 0700))
    exit(1);
  if (mount("/sys", "./syz-tmp/newroot/sys", 0, bind_mount_flags, NULL))
    exit(1);
  if (mount("/sys/kernel/debug", "./syz-tmp/newroot/sys/kernel/debug", NULL,
            bind_mount_flags, NULL) &&
      errno != ENOENT)
    exit(1);
  if (mount("/sys/fs/smackfs", "./syz-tmp/newroot/sys/fs/smackfs", NULL,
            bind_mount_flags, NULL) &&
      errno != ENOENT)
    exit(1);
  if (mount("/proc/sys/fs/binfmt_misc",
            "./syz-tmp/newroot/proc/sys/fs/binfmt_misc", NULL, bind_mount_flags,
            NULL) &&
      errno != ENOENT)
    exit(1);
  if (mkdir("./syz-tmp/newroot/syz-inputs", 0700))
    exit(1);
  if (mount("/syz-inputs", "./syz-tmp/newroot/syz-inputs", NULL,
            bind_mount_flags | MS_RDONLY, NULL) &&
      errno != ENOENT)
    exit(1);
  if (mkdir("./syz-tmp/pivot", 0777))
    exit(1);
  if (syscall(SYS_pivot_root, "./syz-tmp", "./syz-tmp/pivot")) {
    if (chdir("./syz-tmp"))
      exit(1);
  } else {
    if (chdir("/"))
      exit(1);
    if (umount2("./pivot", MNT_DETACH))
      exit(1);
  }
  if (chroot("./newroot"))
    exit(1);
  if (chdir("/"))
    exit(1);
  setup_gadgetfs();
  setup_binderfs();
  setup_fusectl();
}

static void setup_gadgetfs()
{
  if (mkdir("/dev/gadgetfs", 0777)) {
  }
  if (mount("gadgetfs", "/dev/gadgetfs", "gadgetfs", 0, NULL)) {
  }
}

static void setup_fusectl()
{
  if (mount(0, "/sys/fs/fuse/connections", "fusectl", 0, 0)) {
  }
}

static void setup_binderfs()
{
  if (mkdir("/dev/binderfs", 0777)) {
  }
  if (mount("binder", "/dev/binderfs", "binder", 0, NULL)) {
  }
  if (symlink("/dev/binderfs", "./binderfs")) {
  }
}

static void loop();

static void sandbox_common()
{
  prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
  if (getppid() == 1)
    exit(1);
  struct rlimit rlim;
  rlim.rlim_cur = rlim.rlim_max = (200 << 20);
  setrlimit(RLIMIT_AS, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 32 << 20;
  setrlimit(RLIMIT_MEMLOCK, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 136 << 20;
  setrlimit(RLIMIT_FSIZE, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 1 << 20;
  setrlimit(RLIMIT_STACK, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 128 << 20;
  setrlimit(RLIMIT_CORE, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 256;
  setrlimit(RLIMIT_NOFILE, &rlim);
  if (unshare(CLONE_NEWNS)) {
  }
  if (mount(NULL, "/", NULL, MS_REC | MS_PRIVATE, NULL)) {
  }
  if (unshare(CLONE_NEWIPC)) {
  }
  if (unshare(0x02000000)) {
  }
  if (unshare(CLONE_NEWUTS)) {
  }
  if (unshare(CLONE_SYSVSEM)) {
  }
  typedef struct {
    const char* name;
    const char* value;
  } sysctl_t;
  static const sysctl_t sysctls[] = {
      {"/proc/sys/kernel/shmmax", "16777216"},
      {"/proc/sys/kernel/shmall", "536870912"},
      {"/proc/sys/kernel/shmmni", "1024"},
      {"/proc/sys/kernel/msgmax", "8192"},
      {"/proc/sys/kernel/msgmni", "1024"},
      {"/proc/sys/kernel/msgmnb", "1024"},
      {"/proc/sys/kernel/sem", "1024 1048576 500 1024"},
  };
  unsigned i;
  for (i = 0; i < sizeof(sysctls) / sizeof(sysctls[0]); i++)
    write_file(sysctls[i].name, sysctls[i].value);
}

static int wait_for_loop(int pid)
{
  if (pid < 0)
    exit(1);
  int status = 0;
  while (waitpid(-1, &status, __WALL) != pid) {
  }
  return WEXITSTATUS(status);
}

static void drop_caps(void)
{
  struct __user_cap_header_struct cap_hdr = {};
  struct __user_cap_data_struct cap_data[2] = {};
  cap_hdr.version = _LINUX_CAPABILITY_VERSION_3;
  cap_hdr.pid = getpid();
  if (syscall(SYS_capget, &cap_hdr, &cap_data))
    exit(1);
  const int drop = (1 << CAP_SYS_PTRACE) | (1 << CAP_SYS_NICE);
  cap_data[0].effective &= ~drop;
  cap_data[0].permitted &= ~drop;
  cap_data[0].inheritable &= ~drop;
  if (syscall(SYS_capset, &cap_hdr, &cap_data))
    exit(1);
}

static int do_sandbox_none(void)
{
  if (unshare(CLONE_NEWPID)) {
  }
  int pid = fork();
  if (pid != 0)
    return wait_for_loop(pid);
  sandbox_common();
  drop_caps();
  initialize_netdevices_init();
  if (unshare(CLONE_NEWNET)) {
  }
  write_file("/proc/sys/net/ipv4/ping_group_range", "0 65535");
  initialize_tun();
  initialize_netdevices();
  sandbox_common_mount_tmpfs();
  loop();
  exit(1);
}

uint64_t r[3] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff};

void loop(void)
{
  intptr_t res = 0;
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  //  socket$nl_netfilter arguments: [
  //    domain: const = 0x10 (8 bytes)
  //    type: const = 0x3 (8 bytes)
  //    proto: const = 0xc (4 bytes)
  //  ]
  //  returns sock_nl_netfilter
  res = syscall(__NR_socket, /*domain=*/0x10ul, /*type=*/3ul, /*proto=*/0xc);
  if (res != -1)
    r[0] = res;
  //  sendmsg$NFT_BATCH arguments: [
  //    fd: sock_nl_netfilter (resource)
  //    msg: ptr[in, msghdr_netlink[nft_batch_msg]] {
  //      msghdr_netlink[nft_batch_msg] {
  //        addr: nil
  //        addrlen: len = 0x0 (4 bytes)
  //        pad = 0x0 (4 bytes)
  //        vec: ptr[in, iovec[in, nft_batch_msg]] {
  //          iovec[in, nft_batch_msg] {
  //            addr: ptr[in, nft_batch_msg] {
  //              nft_batch_msg {
  //                begin: nft_nlmsghdr[NFNL_MSG_BATCH_BEGIN] {
  //                  nlmsg_len: len = 0x14 (4 bytes)
  //                  nlmsg_type: const = 0x10 (2 bytes)
  //                  nlmsg_flags: const = 0x1 (2 bytes)
  //                  nlmsg_seq: const = 0x0 (4 bytes)
  //                  nlmsg_pid: const = 0x0 (4 bytes)
  //                  hdr: nfgenmsg_nft {
  //                    nfgen_family: families = 0x2 (1 bytes)
  //                    version: const = 0x0 (1 bytes)
  //                    res_id: const = 0xa (2 bytes)
  //                  }
  //                }
  //                msgs: array[nft_batch_message] {
  //                  union nft_batch_message {
  //                    NFT_MSG_NEWTABLE:
  //                    netlink_msg_netfilter_tt[NFNL_SUBSYS_NFTABLES,
  //                    NFT_MSG_NEWTABLE, array[nft_table_policy]] {
  //                      len: len = 0x20 (4 bytes)
  //                      type: const = 0x0 (1 bytes)
  //                      subsys: const = 0xa (1 bytes)
  //                      flags: netlink_netfilter_msg_flags = 0x601 (2 bytes)
  //                      seq: const = 0x0 (4 bytes)
  //                      pid: const = 0x0 (4 bytes)
  //                      hdr: nfgenmsg {
  //                        nfgen_family: nfproto = 0x2 (1 bytes)
  //                        version: const = 0x0 (1 bytes)
  //                        res_id: int16be = 0x0 (2 bytes)
  //                      }
  //                      attrs: array[nft_table_policy] {
  //                        union nft_table_policy {
  //                          NFTA_TABLE_NAME: nlattr_t[const[NFTA_TABLE_NAME,
  //                          int16], string[nft_table_name]] {
  //                            nla_len: offsetof = 0x9 (2 bytes)
  //                            nla_type: const = 0x1 (2 bytes)
  //                            payload: buffer: {73 79 7a 30 00} (length 0x5)
  //                            size: buffer: {} (length 0x0)
  //                            pad = 0x0 (3 bytes)
  //                          }
  //                        }
  //                      }
  //                    }
  //                  }
  //                  union nft_batch_message {
  //                    NFT_MSG_NEWFLOWTABLE:
  //                    netlink_msg_netfilter_tt[NFNL_SUBSYS_NFTABLES,
  //                    NFT_MSG_NEWFLOWTABLE, array[nft_flowtable_policy]] {
  //                      len: len = 0x58 (4 bytes)
  //                      type: const = 0x16 (1 bytes)
  //                      subsys: const = 0xa (1 bytes)
  //                      flags: netlink_netfilter_msg_flags = 0x601 (2 bytes)
  //                      seq: const = 0x0 (4 bytes)
  //                      pid: const = 0x0 (4 bytes)
  //                      hdr: nfgenmsg {
  //                        nfgen_family: nfproto = 0x2 (1 bytes)
  //                        version: const = 0x0 (1 bytes)
  //                        res_id: int16be = 0x0 (2 bytes)
  //                      }
  //                      attrs: array[nft_flowtable_policy] {
  //                        union nft_flowtable_policy {
  //                          NFTA_FLOWTABLE_TABLE:
  //                          nlattr_t[const[NFTA_FLOWTABLE_TABLE, int16],
  //                          string[nft_table_name]] {
  //                            nla_len: offsetof = 0x9 (2 bytes)
  //                            nla_type: const = 0x1 (2 bytes)
  //                            payload: buffer: {73 79 7a 30 00} (length 0x5)
  //                            size: buffer: {} (length 0x0)
  //                            pad = 0x0 (3 bytes)
  //                          }
  //                        }
  //                        union nft_flowtable_policy {
  //                          NFTA_FLOWTABLE_NAME:
  //                          nlattr_t[const[NFTA_FLOWTABLE_NAME, int16],
  //                          string[nft_flowtable_name]] {
  //                            nla_len: offsetof = 0x9 (2 bytes)
  //                            nla_type: const = 0x2 (2 bytes)
  //                            payload: buffer: {73 79 7a 30 00} (length 0x5)
  //                            size: buffer: {} (length 0x0)
  //                            pad = 0x0 (3 bytes)
  //                          }
  //                        }
  //                        union nft_flowtable_policy {
  //                          NFTA_FLOWTABLE_HOOK:
  //                          nlattr_tt[const[NFTA_FLOWTABLE_HOOK, int16:14], 0,
  //                          1, array[nft_flowtable_hook_policy]] {
  //                            nla_len: offsetof = 0x2c (2 bytes)
  //                            nla_type: const = 0x3 (1 bytes)
  //                            NLA_F_NET_BYTEORDER: const = 0x0 (0 bytes)
  //                            NLA_F_NESTED: const = 0x1 (1 bytes)
  //                            payload: array[nft_flowtable_hook_policy] {
  //                              union nft_flowtable_hook_policy {
  //                                NFTA_FLOWTABLE_HOOK_NUM:
  //                                nlattr_tt[const[NFTA_FLOWTABLE_HOOK_NUM,
  //                                int16:14], 1, 0, const[NF_NETDEV_INGRESS,
  //                                int32be]] {
  //                                  nla_len: offsetof = 0x8 (2 bytes)
  //                                  nla_type: const = 0x1 (1 bytes)
  //                                  NLA_F_NET_BYTEORDER: const = 0x1 (0 bytes)
  //                                  NLA_F_NESTED: const = 0x0 (1 bytes)
  //                                  payload: const = 0x0 (4 bytes)
  //                                  size: buffer: {} (length 0x0)
  //                                }
  //                              }
  //                              union nft_flowtable_hook_policy {
  //                                NFTA_FLOWTABLE_HOOK_PRIORITY:
  //                                nlattr_tt[const[NFTA_FLOWTABLE_HOOK_PRIORITY,
  //                                int16:14], 1, 0, int32be] {
  //                                  nla_len: offsetof = 0x8 (2 bytes)
  //                                  nla_type: const = 0x2 (1 bytes)
  //                                  NLA_F_NET_BYTEORDER: const = 0x1 (0 bytes)
  //                                  NLA_F_NESTED: const = 0x0 (1 bytes)
  //                                  payload: int32be = 0x0 (4 bytes)
  //                                  size: buffer: {} (length 0x0)
  //                                }
  //                              }
  //                              union nft_flowtable_hook_policy {
  //                                NFTA_FLOWTABLE_HOOK_DEVS:
  //                                nlattr_tt[const[NFTA_FLOWTABLE_HOOK_DEVS,
  //                                int16:14], 0, 1,
  //                                array[nlattr[NFTA_DEVICE_NAME, devname]]] {
  //                                  nla_len: offsetof = 0x18 (2 bytes)
  //                                  nla_type: const = 0x3 (1 bytes)
  //                                  NLA_F_NET_BYTEORDER: const = 0x0 (0 bytes)
  //                                  NLA_F_NESTED: const = 0x1 (1 bytes)
  //                                  payload:
  //                                  array[nlattr_t[const[NFTA_DEVICE_NAME,
  //                                  int16], devname]] {
  //                                    nlattr_t[const[NFTA_DEVICE_NAME, int16],
  //                                    devname] {
  //                                      nla_len: offsetof = 0x14 (2 bytes)
  //                                      nla_type: const = 0x1 (2 bytes)
  //                                      payload: buffer: {6c 6f 00 00 00 00 00
  //                                      00 00 00 00 00 00 00 00 00} (length
  //                                      0x10) size: buffer: {} (length 0x0)
  //                                    }
  //                                  }
  //                                  size: buffer: {} (length 0x0)
  //                                }
  //                              }
  //                            }
  //                            size: buffer: {} (length 0x0)
  //                          }
  //                        }
  //                      }
  //                    }
  //                  }
  //                  union nft_batch_message {
  //                    NFT_MSG_NEWCHAIN:
  //                    netlink_msg_netfilter_tt[NFNL_SUBSYS_NFTABLES,
  //                    NFT_MSG_NEWCHAIN, array[nft_chain_policy]] {
  //                      len: len = 0x40 (4 bytes)
  //                      type: const = 0x3 (1 bytes)
  //                      subsys: const = 0xa (1 bytes)
  //                      flags: netlink_netfilter_msg_flags = 0x601 (2 bytes)
  //                      seq: const = 0x0 (4 bytes)
  //                      pid: const = 0x0 (4 bytes)
  //                      hdr: nfgenmsg {
  //                        nfgen_family: nfproto = 0x2 (1 bytes)
  //                        version: const = 0x0 (1 bytes)
  //                        res_id: int16be = 0x0 (2 bytes)
  //                      }
  //                      attrs: array[nft_chain_policy] {
  //                        union nft_chain_policy {
  //                          NFTA_CHAIN_TABLE: nlattr_t[const[NFTA_CHAIN_TABLE,
  //                          int16], string[nft_table_name]] {
  //                            nla_len: offsetof = 0x9 (2 bytes)
  //                            nla_type: const = 0x1 (2 bytes)
  //                            payload: buffer: {73 79 7a 30 00} (length 0x5)
  //                            size: buffer: {} (length 0x0)
  //                            pad = 0x0 (3 bytes)
  //                          }
  //                        }
  //                        union nft_chain_policy {
  //                          NFTA_CHAIN_NAME: nlattr_t[const[NFTA_CHAIN_NAME,
  //                          int16], string[nft_chain_name]] {
  //                            nla_len: offsetof = 0x9 (2 bytes)
  //                            nla_type: const = 0x3 (2 bytes)
  //                            payload: buffer: {73 79 7a 30 00} (length 0x5)
  //                            size: buffer: {} (length 0x0)
  //                            pad = 0x0 (3 bytes)
  //                          }
  //                        }
  //                        union nft_chain_policy {
  //                          NFTA_CHAIN_HOOK: nlattr_tt[const[NFTA_CHAIN_HOOK,
  //                          int16:14], 0, 1, array[nft_hook_policy]] {
  //                            nla_len: offsetof = 0x14 (2 bytes)
  //                            nla_type: const = 0x4 (1 bytes)
  //                            NLA_F_NET_BYTEORDER: const = 0x0 (0 bytes)
  //                            NLA_F_NESTED: const = 0x1 (1 bytes)
  //                            payload: array[nft_hook_policy] {
  //                              union nft_hook_policy {
  //                                NFTA_HOOK_HOOKNUM:
  //                                nlattr_tt[const[NFTA_HOOK_HOOKNUM,
  //                                int16:14], 1, 0, flags[nf_inet_hooks,
  //                                int32be]] {
  //                                  nla_len: offsetof = 0x8 (2 bytes)
  //                                  nla_type: const = 0x1 (1 bytes)
  //                                  NLA_F_NET_BYTEORDER: const = 0x1 (0 bytes)
  //                                  NLA_F_NESTED: const = 0x0 (1 bytes)
  //                                  payload: nf_inet_hooks = 0x2 (4 bytes)
  //                                  size: buffer: {} (length 0x0)
  //                                }
  //                              }
  //                              union nft_hook_policy {
  //                                NFTA_HOOK_PRIORITY:
  //                                nlattr_tt[const[NFTA_HOOK_PRIORITY,
  //                                int16:14], 1, 0,
  //                                int32be[NF_IP_PRI_CONNTRACK:NF_IP_PRI_LAST]]
  //                                {
  //                                  nla_len: offsetof = 0x8 (2 bytes)
  //                                  nla_type: const = 0x2 (1 bytes)
  //                                  NLA_F_NET_BYTEORDER: const = 0x1 (0 bytes)
  //                                  NLA_F_NESTED: const = 0x0 (1 bytes)
  //                                  payload: int32be = 0x0 (4 bytes)
  //                                  size: buffer: {} (length 0x0)
  //                                }
  //                              }
  //                            }
  //                            size: buffer: {} (length 0x0)
  //                          }
  //                        }
  //                      }
  //                    }
  //                  }
  //                  union nft_batch_message {
  //                    NFT_MSG_NEWRULE:
  //                    netlink_msg_netfilter_tt[NFNL_SUBSYS_NFTABLES,
  //                    NFT_MSG_NEWRULE, array[nft_rule_policy]] {
  //                      len: len = 0x58 (4 bytes)
  //                      type: const = 0x6 (1 bytes)
  //                      subsys: const = 0xa (1 bytes)
  //                      flags: netlink_netfilter_msg_flags = 0x601 (2 bytes)
  //                      seq: const = 0x0 (4 bytes)
  //                      pid: const = 0x0 (4 bytes)
  //                      hdr: nfgenmsg {
  //                        nfgen_family: nfproto = 0x2 (1 bytes)
  //                        version: const = 0x0 (1 bytes)
  //                        res_id: int16be = 0x0 (2 bytes)
  //                      }
  //                      attrs: array[nft_rule_policy] {
  //                        union nft_rule_policy {
  //                          NFTA_RULE_TABLE: nlattr_t[const[NFTA_RULE_TABLE,
  //                          int16], string[nft_table_name]] {
  //                            nla_len: offsetof = 0x9 (2 bytes)
  //                            nla_type: const = 0x1 (2 bytes)
  //                            payload: buffer: {73 79 7a 30 00} (length 0x5)
  //                            size: buffer: {} (length 0x0)
  //                            pad = 0x0 (3 bytes)
  //                          }
  //                        }
  //                        union nft_rule_policy {
  //                          NFTA_RULE_CHAIN: nlattr_t[const[NFTA_RULE_CHAIN,
  //                          int16], string[nft_chain_name]] {
  //                            nla_len: offsetof = 0x9 (2 bytes)
  //                            nla_type: const = 0x2 (2 bytes)
  //                            payload: buffer: {73 79 7a 30 00} (length 0x5)
  //                            size: buffer: {} (length 0x0)
  //                            pad = 0x0 (3 bytes)
  //                          }
  //                        }
  //                        union nft_rule_policy {
  //                          NFTA_RULE_EXPRESSIONS:
  //                          nlattr_tt[const[NFTA_RULE_EXPRESSIONS, int16:14],
  //                          0, 1, array[nlnest[NFTA_LIST_ELEM,
  //                          nft_expr_policy]]] {
  //                            nla_len: offsetof = 0x2c (2 bytes)
  //                            nla_type: const = 0x4 (1 bytes)
  //                            NLA_F_NET_BYTEORDER: const = 0x0 (0 bytes)
  //                            NLA_F_NESTED: const = 0x1 (1 bytes)
  //                            payload: array[nlattr_tt[const[NFTA_LIST_ELEM,
  //                            int16:14], 0, 1, nft_expr_policy]] {
  //                              nlattr_tt[const[NFTA_LIST_ELEM, int16:14], 0,
  //                              1, nft_expr_policy] {
  //                                nla_len: offsetof = 0x28 (2 bytes)
  //                                nla_type: const = 0x1 (1 bytes)
  //                                NLA_F_NET_BYTEORDER: const = 0x0 (0 bytes)
  //                                NLA_F_NESTED: const = 0x1 (1 bytes)
  //                                payload: union nft_expr_policy {
  //                                  flow_offload:
  //                                  nft_expr_policy_t["flow_offload",
  //                                  nft_flow_offload_policy] {
  //                                    NFTA_EXPR_NAME:
  //                                    nlattr_t[const[NFTA_EXPR_NAME, int16],
  //                                    string["flow_offload"]] {
  //                                      nla_len: offsetof = 0x11 (2 bytes)
  //                                      nla_type: const = 0x1 (2 bytes)
  //                                      payload: buffer: {66 6c 6f 77 5f 6f 66
  //                                      66 6c 6f 61 64 00} (length 0xd) size:
  //                                      buffer: {} (length 0x0) pad = 0x0 (3
  //                                      bytes)
  //                                    }
  //                                    NFTA_EXPR_DATA: union
  //                                    optional[nlnest[NFTA_EXPR_DATA,
  //                                    array[nft_flow_offload_policy]]] {
  //                                      val: nlattr_tt[const[NFTA_EXPR_DATA,
  //                                      int16:14], 0, 1,
  //                                      array[nft_flow_offload_policy]] {
  //                                        nla_len: offsetof = 0x10 (2 bytes)
  //                                        nla_type: const = 0x2 (1 bytes)
  //                                        NLA_F_NET_BYTEORDER: const = 0x0 (0
  //                                        bytes) NLA_F_NESTED: const = 0x1 (1
  //                                        bytes) payload:
  //                                        array[nft_flow_offload_policy] {
  //                                          union nft_flow_offload_policy {
  //                                            NFTA_FLOW_TABLE_NAME:
  //                                            nlattr_t[const[NFTA_FLOW_TABLE_NAME,
  //                                            int16],
  //                                            string[nft_flowtable_name]] {
  //                                              nla_len: offsetof = 0x9 (2
  //                                              bytes) nla_type: const = 0x1
  //                                              (2 bytes) payload: buffer: {73
  //                                              79 7a 30 00} (length 0x5)
  //                                              size: buffer: {} (length 0x0)
  //                                              pad = 0x0 (3 bytes)
  //                                            }
  //                                          }
  //                                        }
  //                                        size: buffer: {} (length 0x0)
  //                                      }
  //                                    }
  //                                  }
  //                                }
  //                                size: buffer: {} (length 0x0)
  //                              }
  //                            }
  //                            size: buffer: {} (length 0x0)
  //                          }
  //                        }
  //                      }
  //                    }
  //                  }
  //                }
  //                end: nft_nlmsghdr[NFNL_MSG_BATCH_END] {
  //                  nlmsg_len: len = 0x14 (4 bytes)
  //                  nlmsg_type: const = 0x11 (2 bytes)
  //                  nlmsg_flags: const = 0x1 (2 bytes)
  //                  nlmsg_seq: const = 0x0 (4 bytes)
  //                  nlmsg_pid: const = 0x0 (4 bytes)
  //                  hdr: nfgenmsg_nft {
  //                    nfgen_family: families = 0x2 (1 bytes)
  //                    version: const = 0x0 (1 bytes)
  //                    res_id: const = 0xa (2 bytes)
  //                  }
  //                }
  //              }
  //            }
  //            len: len = 0x138 (8 bytes)
  //          }
  //        }
  //        vlen: const = 0x1 (8 bytes)
  //        ctrl: const = 0x0 (8 bytes)
  //        ctrllen: const = 0x0 (8 bytes)
  //        f: send_flags = 0x0 (4 bytes)
  //        pad = 0x0 (4 bytes)
  //      }
  //    }
  //    f: send_flags = 0x0 (8 bytes)
  //  ]
  *(uint64_t*)0x200000000000 = 0;
  *(uint32_t*)0x200000000008 = 0;
  *(uint64_t*)0x200000000010 = 0x200000000100;
  *(uint64_t*)0x200000000100 = 0x200000000200;
  *(uint32_t*)0x200000000200 = 0x14;
  *(uint16_t*)0x200000000204 = 0x10;
  *(uint16_t*)0x200000000206 = 1;
  *(uint32_t*)0x200000000208 = 0;
  *(uint32_t*)0x20000000020c = 0;
  *(uint8_t*)0x200000000210 = 2;
  *(uint8_t*)0x200000000211 = 0;
  *(uint16_t*)0x200000000212 = htobe16(0xa);
  *(uint32_t*)0x200000000214 = 0x20;
  *(uint8_t*)0x200000000218 = 0;
  *(uint8_t*)0x200000000219 = 0xa;
  *(uint16_t*)0x20000000021a = 0x601;
  *(uint32_t*)0x20000000021c = 0;
  *(uint32_t*)0x200000000220 = 0;
  *(uint8_t*)0x200000000224 = 2;
  *(uint8_t*)0x200000000225 = 0;
  *(uint16_t*)0x200000000226 = htobe16(0);
  *(uint16_t*)0x200000000228 = 9;
  *(uint16_t*)0x20000000022a = 1;
  memcpy((void*)0x20000000022c, "syz0\000", 5);
  *(uint32_t*)0x200000000234 = 0x58;
  *(uint8_t*)0x200000000238 = 0x16;
  *(uint8_t*)0x200000000239 = 0xa;
  *(uint16_t*)0x20000000023a = 0x601;
  *(uint32_t*)0x20000000023c = 0;
  *(uint32_t*)0x200000000240 = 0;
  *(uint8_t*)0x200000000244 = 2;
  *(uint8_t*)0x200000000245 = 0;
  *(uint16_t*)0x200000000246 = htobe16(0);
  *(uint16_t*)0x200000000248 = 9;
  *(uint16_t*)0x20000000024a = 1;
  memcpy((void*)0x20000000024c, "syz0\000", 5);
  *(uint16_t*)0x200000000254 = 9;
  *(uint16_t*)0x200000000256 = 2;
  memcpy((void*)0x200000000258, "syz0\000", 5);
  *(uint16_t*)0x200000000260 = 0x2c;
  STORE_BY_BITMASK(uint16_t, , 0x200000000262, 3, 0, 14);
  STORE_BY_BITMASK(uint16_t, , 0x200000000263, 0, 6, 1);
  STORE_BY_BITMASK(uint16_t, , 0x200000000263, 1, 7, 1);
  *(uint16_t*)0x200000000264 = 8;
  STORE_BY_BITMASK(uint16_t, , 0x200000000266, 1, 0, 14);
  STORE_BY_BITMASK(uint16_t, , 0x200000000267, 1, 6, 1);
  STORE_BY_BITMASK(uint16_t, , 0x200000000267, 0, 7, 1);
  *(uint32_t*)0x200000000268 = htobe32(0);
  *(uint16_t*)0x20000000026c = 8;
  STORE_BY_BITMASK(uint16_t, , 0x20000000026e, 2, 0, 14);
  STORE_BY_BITMASK(uint16_t, , 0x20000000026f, 1, 6, 1);
  STORE_BY_BITMASK(uint16_t, , 0x20000000026f, 0, 7, 1);
  *(uint32_t*)0x200000000270 = htobe32(0);
  *(uint16_t*)0x200000000274 = 0x18;
  STORE_BY_BITMASK(uint16_t, , 0x200000000276, 3, 0, 14);
  STORE_BY_BITMASK(uint16_t, , 0x200000000277, 0, 6, 1);
  STORE_BY_BITMASK(uint16_t, , 0x200000000277, 1, 7, 1);
  *(uint16_t*)0x200000000278 = 0x14;
  *(uint16_t*)0x20000000027a = 1;
  memcpy((void*)0x20000000027c,
         "lo\000\000\000\000\000\000\000\000\000\000\000\000\000\000", 16);
  *(uint32_t*)0x20000000028c = 0x40;
  *(uint8_t*)0x200000000290 = 3;
  *(uint8_t*)0x200000000291 = 0xa;
  *(uint16_t*)0x200000000292 = 0x601;
  *(uint32_t*)0x200000000294 = 0;
  *(uint32_t*)0x200000000298 = 0;
  *(uint8_t*)0x20000000029c = 2;
  *(uint8_t*)0x20000000029d = 0;
  *(uint16_t*)0x20000000029e = htobe16(0);
  *(uint16_t*)0x2000000002a0 = 9;
  *(uint16_t*)0x2000000002a2 = 1;
  memcpy((void*)0x2000000002a4, "syz0\000", 5);
  *(uint16_t*)0x2000000002ac = 9;
  *(uint16_t*)0x2000000002ae = 3;
  memcpy((void*)0x2000000002b0, "syz0\000", 5);
  *(uint16_t*)0x2000000002b8 = 0x14;
  STORE_BY_BITMASK(uint16_t, , 0x2000000002ba, 4, 0, 14);
  STORE_BY_BITMASK(uint16_t, , 0x2000000002bb, 0, 6, 1);
  STORE_BY_BITMASK(uint16_t, , 0x2000000002bb, 1, 7, 1);
  *(uint16_t*)0x2000000002bc = 8;
  STORE_BY_BITMASK(uint16_t, , 0x2000000002be, 1, 0, 14);
  STORE_BY_BITMASK(uint16_t, , 0x2000000002bf, 1, 6, 1);
  STORE_BY_BITMASK(uint16_t, , 0x2000000002bf, 0, 7, 1);
  *(uint32_t*)0x2000000002c0 = htobe32(2);
  *(uint16_t*)0x2000000002c4 = 8;
  STORE_BY_BITMASK(uint16_t, , 0x2000000002c6, 2, 0, 14);
  STORE_BY_BITMASK(uint16_t, , 0x2000000002c7, 1, 6, 1);
  STORE_BY_BITMASK(uint16_t, , 0x2000000002c7, 0, 7, 1);
  *(uint32_t*)0x2000000002c8 = htobe32(0);
  *(uint32_t*)0x2000000002cc = 0x58;
  *(uint8_t*)0x2000000002d0 = 6;
  *(uint8_t*)0x2000000002d1 = 0xa;
  *(uint16_t*)0x2000000002d2 = 0x601;
  *(uint32_t*)0x2000000002d4 = 0;
  *(uint32_t*)0x2000000002d8 = 0;
  *(uint8_t*)0x2000000002dc = 2;
  *(uint8_t*)0x2000000002dd = 0;
  *(uint16_t*)0x2000000002de = htobe16(0);
  *(uint16_t*)0x2000000002e0 = 9;
  *(uint16_t*)0x2000000002e2 = 1;
  memcpy((void*)0x2000000002e4, "syz0\000", 5);
  *(uint16_t*)0x2000000002ec = 9;
  *(uint16_t*)0x2000000002ee = 2;
  memcpy((void*)0x2000000002f0, "syz0\000", 5);
  *(uint16_t*)0x2000000002f8 = 0x2c;
  STORE_BY_BITMASK(uint16_t, , 0x2000000002fa, 4, 0, 14);
  STORE_BY_BITMASK(uint16_t, , 0x2000000002fb, 0, 6, 1);
  STORE_BY_BITMASK(uint16_t, , 0x2000000002fb, 1, 7, 1);
  *(uint16_t*)0x2000000002fc = 0x28;
  STORE_BY_BITMASK(uint16_t, , 0x2000000002fe, 1, 0, 14);
  STORE_BY_BITMASK(uint16_t, , 0x2000000002ff, 0, 6, 1);
  STORE_BY_BITMASK(uint16_t, , 0x2000000002ff, 1, 7, 1);
  *(uint16_t*)0x200000000300 = 0x11;
  *(uint16_t*)0x200000000302 = 1;
  memcpy((void*)0x200000000304, "flow_offload\000", 13);
  *(uint16_t*)0x200000000314 = 0x10;
  STORE_BY_BITMASK(uint16_t, , 0x200000000316, 2, 0, 14);
  STORE_BY_BITMASK(uint16_t, , 0x200000000317, 0, 6, 1);
  STORE_BY_BITMASK(uint16_t, , 0x200000000317, 1, 7, 1);
  *(uint16_t*)0x200000000318 = 9;
  *(uint16_t*)0x20000000031a = 1;
  memcpy((void*)0x20000000031c, "syz0\000", 5);
  *(uint32_t*)0x200000000324 = 0x14;
  *(uint16_t*)0x200000000328 = 0x11;
  *(uint16_t*)0x20000000032a = 1;
  *(uint32_t*)0x20000000032c = 0;
  *(uint32_t*)0x200000000330 = 0;
  *(uint8_t*)0x200000000334 = 2;
  *(uint8_t*)0x200000000335 = 0;
  *(uint16_t*)0x200000000336 = htobe16(0xa);
  *(uint64_t*)0x200000000108 = 0x138;
  *(uint64_t*)0x200000000018 = 1;
  *(uint64_t*)0x200000000020 = 0;
  *(uint64_t*)0x200000000028 = 0;
  *(uint32_t*)0x200000000030 = 0;
  syscall(__NR_sendmsg, /*fd=*/r[0], /*msg=*/0x200000000000ul, /*f=*/0ul);
  //  mkdirat arguments: [
  //    fd: fd_dir (resource)
  //    path: ptr[in, buffer] {
  //      buffer: {2e 2f 70 72 6f 63 00} (length 0x7)
  //    }
  //    mode: open_mode = 0x1ff (8 bytes)
  //  ]
  memcpy((void*)0x200000000040, "./proc\000", 7);
  syscall(
      __NR_mkdirat, /*fd=*/0xffffff9c, /*path=*/0x200000000040ul,
      /*mode=S_IXOTH|S_IWOTH|S_IROTH|S_IXGRP|S_IWGRP|S_IRGRP|S_IXUSR|S_IWUSR|0x100*/
      0x1fful);
  //  mount arguments: [
  //    src: nil
  //    dst: ptr[in, buffer] {
  //      buffer: {2e 2f 70 72 6f 63 00} (length 0x7)
  //    }
  //    type: ptr[in, buffer] {
  //      buffer: {70 72 6f 63 00} (length 0x5)
  //    }
  //    flags: mount_flags = 0x0 (8 bytes)
  //    data: nil
  //  ]
  memcpy((void*)0x200000000080, "./proc\000", 7);
  memcpy((void*)0x2000000000c0, "proc\000", 5);
  syscall(__NR_mount, /*src=*/0ul, /*dst=*/0x200000000080ul,
          /*type=*/0x2000000000c0ul, /*flags=*/0ul, /*data=*/0ul);
  //  openat arguments: [
  //    fd: fd_dir (resource)
  //    file: ptr[in, buffer] {
  //      buffer: {2e 2f 70 72 6f 63 2f 73 79 73 2f 6e 65 74 2f 69 70 76 34 2f
  //      69 70 5f 66 6f 72 77 61 72 64 00} (length 0x1f)
  //    }
  //    flags: open_flags = 0x1 (4 bytes)
  //    mode: open_mode = 0x0 (2 bytes)
  //  ]
  //  returns fd
  memcpy((void*)0x200000000340, "./proc/sys/net/ipv4/ip_forward\000", 31);
  res = syscall(__NR_openat, /*fd=*/0xffffff9c, /*file=*/0x200000000340ul,
                /*flags=O_WRONLY*/ 1, /*mode=*/0);
  if (res != -1)
    r[1] = res;
  //  write arguments: [
  //    fd: fd (resource)
  //    buf: ptr[in, buffer] {
  //      buffer: {31 0a} (length 0x2)
  //    }
  //    count: len = 0x2 (8 bytes)
  //  ]
  memcpy((void*)0x200000000380, "1\n", 2);
  syscall(__NR_write, /*fd=*/r[1], /*buf=*/0x200000000380ul, /*count=*/2ul);
  //  socket$inet arguments: [
  //    domain: const = 0x2 (8 bytes)
  //    type: socket_type = 0x2 (8 bytes)
  //    proto: int32 = 0x0 (4 bytes)
  //  ]
  //  returns sock_in
  res = syscall(__NR_socket, /*domain=*/2ul, /*type=SOCK_DGRAM*/ 2ul,
                /*proto=*/0);
  if (res != -1)
    r[2] = res;
  //  ioctl$sock_inet_SIOCADDRT arguments: [
  //    fd: sock_in (resource)
  //    cmd: const = 0x890b (4 bytes)
  //    arg: ptr[in, rtentry_in] {
  //      rtentry_in {
  //        rt_pad1: const = 0x0 (8 bytes)
  //        rt_dst: sockaddr_in {
  //          family: const = 0x2 (2 bytes)
  //          port: int16be = 0x0 (2 bytes)
  //          addr: union ipv4_addr {
  //            private: int32be = 0xa010102 (4 bytes)
  //          }
  //          pad = 0x0 (8 bytes)
  //        }
  //        rt_gateway: sockaddr_in {
  //          family: const = 0x2 (2 bytes)
  //          port: int16be = 0x0 (2 bytes)
  //          addr: union ipv4_addr {
  //            empty: const = 0x0 (4 bytes)
  //          }
  //          pad = 0x0 (8 bytes)
  //        }
  //        rt_genmask: sockaddr_in {
  //          family: const = 0x2 (2 bytes)
  //          port: int16be = 0x0 (2 bytes)
  //          addr: union ipv4_addr {
  //            broadcast: const = 0xffffffff (4 bytes)
  //          }
  //          pad = 0x0 (8 bytes)
  //        }
  //        rt_flags: rt_flags = 0x5 (2 bytes)
  //        rt_pad2: const = 0x0 (2 bytes)
  //        pad = 0x0 (4 bytes)
  //        rt_pad3: const = 0x0 (8 bytes)
  //        rt_pad4: const = 0x0 (8 bytes)
  //        rt_metric: int16 = 0x0 (2 bytes)
  //        pad = 0x0 (6 bytes)
  //        rt_dev: ptr[in, buffer] {
  //          buffer: {6c 6f 00 00 00 00 00 00 00 00 00 00 00 00 00 00} (length
  //          0x10)
  //        }
  //        rt_mtu: int64 = 0x0 (8 bytes)
  //        rt_window: int64 = 0x0 (8 bytes)
  //        rt_irtt: int16 = 0x0 (2 bytes)
  //        pad = 0x0 (6 bytes)
  //      }
  //    }
  //  ]
  *(uint64_t*)0x200000000180 = 0;
  *(uint16_t*)0x200000000188 = 2;
  *(uint16_t*)0x20000000018a = htobe16(0);
  *(uint32_t*)0x20000000018c = htobe32(0xa010102);
  *(uint16_t*)0x200000000198 = 2;
  *(uint16_t*)0x20000000019a = htobe16(0);
  *(uint32_t*)0x20000000019c = htobe32(0);
  *(uint16_t*)0x2000000001a8 = 2;
  *(uint16_t*)0x2000000001aa = htobe16(0);
  *(uint32_t*)0x2000000001ac = htobe32(-1);
  *(uint16_t*)0x2000000001b8 = 5;
  *(uint16_t*)0x2000000001ba = 0;
  *(uint64_t*)0x2000000001c0 = 0;
  *(uint64_t*)0x2000000001c8 = 0;
  *(uint16_t*)0x2000000001d0 = 0;
  *(uint64_t*)0x2000000001d8 = 0x200000000400;
  memcpy((void*)0x200000000400,
         "lo\000\000\000\000\000\000\000\000\000\000\000\000\000\000", 16);
  *(uint64_t*)0x2000000001e0 = 0;
  *(uint64_t*)0x2000000001e8 = 0;
  *(uint16_t*)0x2000000001f0 = 0;
  syscall(__NR_ioctl, /*fd=*/r[2], /*cmd=*/0x890b, /*arg=*/0x200000000180ul);
  //  syz_emit_ethernet arguments: [
  //    len: len = 0x2a (8 bytes)
  //    packet: ptr[in, eth_packet] {
  //      eth_packet {
  //        dst_mac: union mac_addr {
  //          local: mac_addr_t[const[0xaa, int8]] {
  //            a0: buffer: {aa aa aa aa aa} (length 0x5)
  //            a1: const = 0xaa (1 bytes)
  //          }
  //        }
  //        src_mac: union mac_addr {
  //          empty: buffer: {00 00 00 00 00 00} (length 0x6)
  //        }
  //        vtag: union optional[vlan_tag] {
  //          void: buffer: {} (length 0x0)
  //        }
  //        payload: eth_payload {
  //          eth2: union eth2_packet {
  //            ipv4: eth2_packet_t[ETH_P_IP, ipv4_packet] {
  //              etype: const = 0x800 (2 bytes)
  //              payload: union ipv4_packet {
  //                udp: ipv4_packet_t[const[IPPROTO_UDP, int8], udp_packet] {
  //                  header: ipv4_header[const[IPPROTO_UDP, int8]] {
  //                    ihl: bytesize4 = 0x5 (0 bytes)
  //                    version: const = 0x4 (1 bytes)
  //                    ecn: int8 = 0x0 (0 bytes)
  //                    dscp: int8 = 0x0 (1 bytes)
  //                    total_len: len = 0x1c (2 bytes)
  //                    id: int16be = 0x64 (2 bytes)
  //                    frag_off: int16be = 0x0 (2 bytes)
  //                    ttl: int8 = 0x40 (1 bytes)
  //                    protocol: const = 0x11 (1 bytes)
  //                    csum: csum = 0x0 (2 bytes)
  //                    src_ip: union ipv4_addr {
  //                      private: int32be = 0xa010101 (4 bytes)
  //                    }
  //                    dst_ip: union ipv4_addr {
  //                      private: int32be = 0xa010102 (4 bytes)
  //                    }
  //                    options: ipv4_options {
  //                      options: array[ipv4_option] {
  //                      }
  //                    }
  //                  }
  //                  payload: udp_packet {
  //                    src_port: int16be = 0x3030 (2 bytes)
  //                    dst_port: int16be = 0x3030 (2 bytes)
  //                    length: len = 0x8 (2 bytes)
  //                    csum: csum = 0x0 (2 bytes)
  //                    payload: union udp_payload {
  //                      opaque: buffer: {} (length 0x0)
  //                    }
  //                  }
  //                }
  //              }
  //            }
  //          }
  //        }
  //      }
  //    }
  //    frags: nil
  //  ]
  memset((void*)0x200000000300, 170, 5);
  *(uint8_t*)0x200000000305 = 0xaa;
  memset((void*)0x200000000306, 0, 6);
  *(uint16_t*)0x20000000030c = htobe16(0x800);
  STORE_BY_BITMASK(uint8_t, , 0x20000000030e, 5, 0, 4);
  STORE_BY_BITMASK(uint8_t, , 0x20000000030e, 4, 4, 4);
  STORE_BY_BITMASK(uint8_t, , 0x20000000030f, 0, 0, 2);
  STORE_BY_BITMASK(uint8_t, , 0x20000000030f, 0, 2, 6);
  *(uint16_t*)0x200000000310 = htobe16(0x1c);
  *(uint16_t*)0x200000000312 = htobe16(0x64);
  *(uint16_t*)0x200000000314 = htobe16(0);
  *(uint8_t*)0x200000000316 = 0x40;
  *(uint8_t*)0x200000000317 = 0x11;
  *(uint16_t*)0x200000000318 = htobe16(0);
  *(uint32_t*)0x20000000031a = htobe32(0xa010101);
  *(uint32_t*)0x20000000031e = htobe32(0xa010102);
  *(uint16_t*)0x200000000322 = htobe16(0x3030);
  *(uint16_t*)0x200000000324 = htobe16(0x3030);
  *(uint16_t*)0x200000000326 = htobe16(8);
  *(uint16_t*)0x200000000328 = htobe16(0);
  struct csum_inet csum_1;
  csum_inet_init(&csum_1);
  csum_inet_update(&csum_1, (const uint8_t*)0x20000000031a, 4);
  csum_inet_update(&csum_1, (const uint8_t*)0x20000000031e, 4);
  uint16_t csum_1_chunk_2 = 0x1100;
  csum_inet_update(&csum_1, (const uint8_t*)&csum_1_chunk_2, 2);
  uint16_t csum_1_chunk_3 = 0x800;
  csum_inet_update(&csum_1, (const uint8_t*)&csum_1_chunk_3, 2);
  csum_inet_update(&csum_1, (const uint8_t*)0x200000000322, 8);
  *(uint16_t*)0x200000000328 = csum_inet_digest(&csum_1);
  struct csum_inet csum_2;
  csum_inet_init(&csum_2);
  csum_inet_update(&csum_2, (const uint8_t*)0x20000000030e, 20);
  *(uint16_t*)0x200000000318 = csum_inet_digest(&csum_2);
  syz_emit_ethernet(/*len=*/0x2a, /*packet=*/0x200000000300, /*frags=*/0);
}
int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffffffff000ul, /*len=*/0x1000, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x200000000000ul, /*len=*/0x1000000,
          /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x200001000000ul, /*len=*/0x1000, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  const char* reason;
  (void)reason;
  do_sandbox_none();
  return 0;
}