text: // KASAN: use-after-free Read in __fput
  // https://syzkaller.appspot.com/bug?id=b65d1d9e4b6cccde9bca
  // status:6
  // autogenerated by syzkaller (https://github.com/google/syzkaller)
  
  #define _GNU_SOURCE
  
  #include <arpa/inet.h>
  #include <dirent.h>
  #include <endian.h>
  #include <errno.h>
  #include <fcntl.h>
  #include <net/if.h>
  #include <net/if_arp.h>
  #include <netinet/in.h>
  #include <pthread.h>
  #include <sched.h>
  #include <setjmp.h>
  #include <signal.h>
  #include <stdarg.h>
  #include <stdbool.h>
  #include <stdint.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <sys/epoll.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/time.h>
  #include <sys/types.h>
  #include <sys/uio.h>
  #include <sys/wait.h>
  #include <time.h>
  #include <unistd.h>
  
  #include <linux/capability.h>
  #include <linux/futex.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/rfkill.h>
  #include <linux/rtnetlink.h>
  #include <linux/tcp.h>
  #include <linux/veth.h>
  
  static unsigned long long procid;
  
  static __thread int skip_segv;
  static __thread jmp_buf segv_env;
  
  static void segv_handler(int sig, siginfo_t* info, void* ctx)
  {
    uintptr_t addr = (uintptr_t)info->si_addr;
    const uintptr_t prog_start = 1 << 20;
    const uintptr_t prog_end = 100 << 20;
    int skip = __atomic_load_n(&skip_segv, __ATOMIC_RELAXED) != 0;
    int valid = addr < prog_start || addr > prog_end;
    if (skip && valid) {
      _longjmp(segv_env, 1);
    }
    exit(sig);
  }
  
  static void install_segv_handler(void)
  {
    struct sigaction sa;
    memset(&sa, 0, sizeof(sa));
    sa.sa_handler = SIG_IGN;
    syscall(SYS_rt_sigaction, 0x20, &sa, NULL, 8);
    syscall(SYS_rt_sigaction, 0x21, &sa, NULL, 8);
    memset(&sa, 0, sizeof(sa));
    sa.sa_sigaction = segv_handler;
    sa.sa_flags = SA_NODEFER | SA_SIGINFO;
    sigaction(SIGSEGV, &sa, NULL);
    sigaction(SIGBUS, &sa, NULL);
  }
  
  #define NONFAILING(...)                                                        \
    {                                                                            \
      __atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
      if (_setjmp(segv_env) == 0) {                                              \
        __VA_ARGS__;                                                             \
      }                                                                          \
      __atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
    }
  
  static void sleep_ms(uint64_t ms)
  {
    usleep(ms * 1000);
  }
  
  static uint64_t current_time_ms(void)
  {
    struct timespec ts;
    if (clock_gettime(CLOCK_MONOTONIC, &ts))
      exit(1);
    return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;
  }
  
  static void use_temporary_dir(void)
  {
    char tmpdir_template[] = "./syzkaller.XXXXXX";
    char* tmpdir = mkdtemp(tmpdir_template);
    if (!tmpdir)
      exit(1);
    if (chmod(tmpdir, 0777))
      exit(1);
    if (chdir(tmpdir))
      exit(1);
  }
  
  static void thread_start(void* (*fn)(void*), void* arg)
  {
    pthread_t th;
    pthread_attr_t attr;
    pthread_attr_init(&attr);
    pthread_attr_setstacksize(&attr, 128 << 10);
    int i = 0;
    for (; i < 100; i++) {
      if (pthread_create(&th, &attr, fn, arg) == 0) {
        pthread_attr_destroy(&attr);
        return;
      }
      if (errno == EAGAIN) {
        usleep(50);
        continue;
      }
      break;
    }
    exit(1);
  }
  
  #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))))
  
  typedef struct {
    int state;
  } event_t;
  
  static void event_init(event_t* ev)
  {
    ev->state = 0;
  }
  
  static void event_reset(event_t* ev)
  {
    ev->state = 0;
  }
  
  static void event_set(event_t* ev)
  {
    if (ev->state)
      exit(1);
    __atomic_store_n(&ev->state, 1, __ATOMIC_RELEASE);
    syscall(SYS_futex, &ev->state, FUTEX_WAKE | FUTEX_PRIVATE_FLAG, 1000000);
  }
  
  static void event_wait(event_t* ev)
  {
    while (!__atomic_load_n(&ev->state, __ATOMIC_ACQUIRE))
      syscall(SYS_futex, &ev->state, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, 0, 0);
  }
  
  static int event_isset(event_t* ev)
  {
    return __atomic_load_n(&ev->state, __ATOMIC_ACQUIRE);
  }
  
  static int event_timedwait(event_t* ev, uint64_t timeout)
  {
    uint64_t start = current_time_ms();
    uint64_t now = start;
    for (;;) {
      uint64_t remain = timeout - (now - start);
      struct timespec ts;
      ts.tv_sec = remain / 1000;
      ts.tv_nsec = (remain % 1000) * 1000 * 1000;
      syscall(SYS_futex, &ev->state, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, 0, &ts);
      if (__atomic_load_n(&ev->state, __ATOMIC_ACQUIRE))
        return 1;
      now = current_time_ms();
      if (now - start > timeout)
        return 0;
    }
  }
  
  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[1024];
  };
  
  static struct nlmsg nlmsg;
  
  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;
    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)
  {
    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;
    unsigned n = sendto(sock, nlmsg->buf, hdr->nlmsg_len, 0,
                        (struct sockaddr*)&addr, sizeof(addr));
    if (n != hdr->nlmsg_len)
      exit(1);
    n = recv(sock, nlmsg->buf, sizeof(nlmsg->buf), 0);
    if (reply_len)
      *reply_len = 0;
    if (hdr->nlmsg_type == NLMSG_DONE)
      return 0;
    if (n < sizeof(struct nlmsghdr))
      exit(1);
    if (reply_len && hdr->nlmsg_type == reply_type) {
      *reply_len = n;
      return 0;
    }
    if (n < sizeof(struct nlmsghdr) + sizeof(struct nlmsgerr))
      exit(1);
    if (hdr->nlmsg_type != NLMSG_ERROR)
      exit(1);
    return -((struct nlmsgerr*)(hdr + 1))->error;
  }
  
  static int netlink_send(struct nlmsg* nlmsg, int sock)
  {
    return netlink_send_ext(nlmsg, sock, 0, NULL);
  }
  
  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 void netlink_add_device_impl(struct nlmsg* nlmsg, const char* type,
                                      const char* name)
  {
    struct ifinfomsg hdr;
    memset(&hdr, 0, sizeof(hdr));
    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_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);
    netlink_done(nlmsg);
    int err = netlink_send(nlmsg, sock);
    (void)err;
  }
  
  static void netlink_add_veth(struct nlmsg* nlmsg, int sock, const char* name,
                               const char* peer)
  {
    netlink_add_device_impl(nlmsg, "veth", name);
    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_done(nlmsg);
    netlink_done(nlmsg);
    netlink_done(nlmsg);
    int err = netlink_send(nlmsg, sock);
    (void)err;
  }
  
  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);
    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);
    (void)err;
  }
  
  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);
    netlink_done(nlmsg);
    int ifindex = if_nametoindex(link);
    netlink_attr(nlmsg, IFLA_LINK, &ifindex, sizeof(ifindex));
    int err = netlink_send(nlmsg, sock);
    (void)err;
  }
  
  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);
    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);
    (void)err;
  }
  
  static void netlink_add_macvlan(struct nlmsg* nlmsg, int sock, const char* name,
                                  const char* link)
  {
    netlink_add_device_impl(nlmsg, "macvlan", name);
    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);
    (void)err;
  }
  
  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);
    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);
    (void)err;
  }
  
  #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);
    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);
    (void)err;
  }
  
  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);
    (void)err;
  }
  
  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));
    (void)err;
  }
  
  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));
    (void)err;
  }
  
  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);
    (void)err;
  }
  
  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 initialize_tun(void)
  {
    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 = 240;
    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 int netlink_devlink_id_get(struct nlmsg* nlmsg, int sock)
  {
    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, DEVLINK_FAMILY_NAME,
                 strlen(DEVLINK_FAMILY_NAME) + 1);
    int n = 0;
    int err = netlink_send_ext(nlmsg, sock, GENL_ID_CTRL, &n);
    if (err) {
      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) {
      return -1;
    }
    recv(sock, nlmsg->buf, sizeof(nlmsg->buf), 0);
    return id;
  }
  
  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_devlink_id_get(&nlmsg, sock);
    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);
    if (err) {
      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)
  {
    char buf[16];
    sprintf(buf, "%u %u", addr, port_count);
    if (write_file("/sys/bus/netdevsim/new_device", buf)) {
      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 int netlink_wireguard_id_get(struct nlmsg* nlmsg, int sock)
  {
    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, WG_GENL_NAME,
                 strlen(WG_GENL_NAME) + 1);
    int n = 0;
    int err = netlink_send_ext(nlmsg, sock, GENL_ID_CTRL, &n);
    if (err) {
      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) {
      return -1;
    }
    recv(sock, nlmsg->buf, sizeof(nlmsg->buf), 0);
    return id;
  }
  
  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_wireguard_id_get(&nlmsg, sock);
    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) {
    }
    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) {
    }
    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) {
    }
  
  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"},
        {"netdevsim", netdevsim},    {"veth", 0},
        {"xfrm", "xfrm0"},           {"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_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 int read_tun(char* data, int size)
  {
    if (tunfd < 0)
      return -1;
    int rv = read(tunfd, data, size);
    if (rv < 0) {
      if (errno == EAGAIN || errno == EBADFD)
        return -1;
      exit(1);
    }
    return rv;
  }
  
  static void flush_tun()
  {
    char data[1000];
    while (read_tun(&data[0], sizeof(data)) != -1) {
    }
  }
  
  #define MAX_FDS 30
  
  #define BTPROTO_HCI 1
  #define ACL_LINK 1
  #define SCAN_PAGE 2
  
  typedef struct {
    uint8_t b[6];
  } __attribute__((packed)) bdaddr_t;
  
  #define HCI_COMMAND_PKT 1
  #define HCI_EVENT_PKT 4
  #define HCI_VENDOR_PKT 0xff
  
  struct hci_command_hdr {
    uint16_t opcode;
    uint8_t plen;
  } __attribute__((packed));
  
  struct hci_event_hdr {
    uint8_t evt;
    uint8_t plen;
  } __attribute__((packed));
  
  #define HCI_EV_CONN_COMPLETE 0x03
  struct hci_ev_conn_complete {
    uint8_t status;
    uint16_t handle;
    bdaddr_t bdaddr;
    uint8_t link_type;
    uint8_t encr_mode;
  } __attribute__((packed));
  
  #define HCI_EV_CONN_REQUEST 0x04
  struct hci_ev_conn_request {
    bdaddr_t bdaddr;
    uint8_t dev_class[3];
    uint8_t link_type;
  } __attribute__((packed));
  
  #define HCI_EV_REMOTE_FEATURES 0x0b
  struct hci_ev_remote_features {
    uint8_t status;
    uint16_t handle;
    uint8_t features[8];
  } __attribute__((packed));
  
  #define HCI_EV_CMD_COMPLETE 0x0e
  struct hci_ev_cmd_complete {
    uint8_t ncmd;
    uint16_t opcode;
  } __attribute__((packed));
  
  #define HCI_OP_WRITE_SCAN_ENABLE 0x0c1a
  
  #define HCI_OP_READ_BUFFER_SIZE 0x1005
  struct hci_rp_read_buffer_size {
    uint8_t status;
    uint16_t acl_mtu;
    uint8_t sco_mtu;
    uint16_t acl_max_pkt;
    uint16_t sco_max_pkt;
  } __attribute__((packed));
  
  #define HCI_OP_READ_BD_ADDR 0x1009
  struct hci_rp_read_bd_addr {
    uint8_t status;
    bdaddr_t bdaddr;
  } __attribute__((packed));
  
  #define HCI_EV_LE_META 0x3e
  struct hci_ev_le_meta {
    uint8_t subevent;
  } __attribute__((packed));
  
  #define HCI_EV_LE_CONN_COMPLETE 0x01
  struct hci_ev_le_conn_complete {
    uint8_t status;
    uint16_t handle;
    uint8_t role;
    uint8_t bdaddr_type;
    bdaddr_t bdaddr;
    uint16_t interval;
    uint16_t latency;
    uint16_t supervision_timeout;
    uint8_t clk_accurancy;
  } __attribute__((packed));
  
  struct hci_dev_req {
    uint16_t dev_id;
    uint32_t dev_opt;
  };
  
  struct vhci_vendor_pkt {
    uint8_t type;
    uint8_t opcode;
    uint16_t id;
  };
  
  #define HCIDEVUP _IOW('H', 201, int)
  #define HCISETSCAN _IOW('H', 221, int)
  
  static int vhci_fd = -1;
  
  static void rfkill_unblock_all()
  {
    int fd = open("/dev/rfkill", O_WRONLY);
    if (fd < 0)
      exit(1);
    struct rfkill_event event = {0};
    event.idx = 0;
    event.type = RFKILL_TYPE_ALL;
    event.op = RFKILL_OP_CHANGE_ALL;
    event.soft = 0;
    event.hard = 0;
    if (write(fd, &event, sizeof(event)) < 0)
      exit(1);
    close(fd);
  }
  
  static void hci_send_event_packet(int fd, uint8_t evt, void* data,
                                    size_t data_len)
  {
    struct iovec iv[3];
    struct hci_event_hdr hdr;
    hdr.evt = evt;
    hdr.plen = data_len;
    uint8_t type = HCI_EVENT_PKT;
    iv[0].iov_base = &type;
    iv[0].iov_len = sizeof(type);
    iv[1].iov_base = &hdr;
    iv[1].iov_len = sizeof(hdr);
    iv[2].iov_base = data;
    iv[2].iov_len = data_len;
    if (writev(fd, iv, sizeof(iv) / sizeof(struct iovec)) < 0)
      exit(1);
  }
  
  static void hci_send_event_cmd_complete(int fd, uint16_t opcode, void* data,
                                          size_t data_len)
  {
    struct iovec iv[4];
    struct hci_event_hdr hdr;
    hdr.evt = HCI_EV_CMD_COMPLETE;
    hdr.plen = sizeof(struct hci_ev_cmd_complete) + data_len;
    struct hci_ev_cmd_complete evt_hdr;
    evt_hdr.ncmd = 1;
    evt_hdr.opcode = opcode;
    uint8_t type = HCI_EVENT_PKT;
    iv[0].iov_base = &type;
    iv[0].iov_len = sizeof(type);
    iv[1].iov_base = &hdr;
    iv[1].iov_len = sizeof(hdr);
    iv[2].iov_base = &evt_hdr;
    iv[2].iov_len = sizeof(evt_hdr);
    iv[3].iov_base = data;
    iv[3].iov_len = data_len;
    if (writev(fd, iv, sizeof(iv) / sizeof(struct iovec)) < 0)
      exit(1);
  }
  
  static bool process_command_pkt(int fd, char* buf, ssize_t buf_size)
  {
    struct hci_command_hdr* hdr = (struct hci_command_hdr*)buf;
    if (buf_size < (ssize_t)sizeof(struct hci_command_hdr) ||
        hdr->plen != buf_size - sizeof(struct hci_command_hdr)) {
      exit(1);
    }
    switch (hdr->opcode) {
    case HCI_OP_WRITE_SCAN_ENABLE: {
      uint8_t status = 0;
      hci_send_event_cmd_complete(fd, hdr->opcode, &status, sizeof(status));
      return true;
    }
    case HCI_OP_READ_BD_ADDR: {
      struct hci_rp_read_bd_addr rp = {0};
      rp.status = 0;
      memset(&rp.bdaddr, 0xaa, 6);
      hci_send_event_cmd_complete(fd, hdr->opcode, &rp, sizeof(rp));
      return false;
    }
    case HCI_OP_READ_BUFFER_SIZE: {
      struct hci_rp_read_buffer_size rp = {0};
      rp.status = 0;
      rp.acl_mtu = 1021;
      rp.sco_mtu = 96;
      rp.acl_max_pkt = 4;
      rp.sco_max_pkt = 6;
      hci_send_event_cmd_complete(fd, hdr->opcode, &rp, sizeof(rp));
      return false;
    }
    }
    char dummy[0xf9] = {0};
    hci_send_event_cmd_complete(fd, hdr->opcode, dummy, sizeof(dummy));
    return false;
  }
  
  static void* event_thread(void* arg)
  {
    while (1) {
      char buf[1024] = {0};
      ssize_t buf_size = read(vhci_fd, buf, sizeof(buf));
      if (buf_size < 0)
        exit(1);
      if (buf_size > 0 && buf[0] == HCI_COMMAND_PKT) {
        if (process_command_pkt(vhci_fd, buf + 1, buf_size - 1))
          break;
      }
    }
    return NULL;
  }
  #define HCI_HANDLE_1 200
  #define HCI_HANDLE_2 201
  
  static void initialize_vhci()
  {
    int hci_sock = socket(AF_BLUETOOTH, SOCK_RAW, BTPROTO_HCI);
    if (hci_sock < 0)
      exit(1);
    vhci_fd = open("/dev/vhci", O_RDWR);
    if (vhci_fd == -1)
      exit(1);
    const int kVhciFd = 241;
    if (dup2(vhci_fd, kVhciFd) < 0)
      exit(1);
    close(vhci_fd);
    vhci_fd = kVhciFd;
    struct vhci_vendor_pkt vendor_pkt;
    if (read(vhci_fd, &vendor_pkt, sizeof(vendor_pkt)) != sizeof(vendor_pkt))
      exit(1);
    if (vendor_pkt.type != HCI_VENDOR_PKT)
      exit(1);
    pthread_t th;
    if (pthread_create(&th, NULL, event_thread, NULL))
      exit(1);
    int ret = ioctl(hci_sock, HCIDEVUP, vendor_pkt.id);
    if (ret) {
      if (errno == ERFKILL) {
        rfkill_unblock_all();
        ret = ioctl(hci_sock, HCIDEVUP, vendor_pkt.id);
      }
      if (ret && errno != EALREADY)
        exit(1);
    }
    struct hci_dev_req dr = {0};
    dr.dev_id = vendor_pkt.id;
    dr.dev_opt = SCAN_PAGE;
    if (ioctl(hci_sock, HCISETSCAN, &dr))
      exit(1);
    struct hci_ev_conn_request request;
    memset(&request, 0, sizeof(request));
    memset(&request.bdaddr, 0xaa, 6);
    *(uint8_t*)&request.bdaddr.b[5] = 0x10;
    request.link_type = ACL_LINK;
    hci_send_event_packet(vhci_fd, HCI_EV_CONN_REQUEST, &request,
                          sizeof(request));
    struct hci_ev_conn_complete complete;
    memset(&complete, 0, sizeof(complete));
    complete.status = 0;
    complete.handle = HCI_HANDLE_1;
    memset(&complete.bdaddr, 0xaa, 6);
    *(uint8_t*)&complete.bdaddr.b[5] = 0x10;
    complete.link_type = ACL_LINK;
    complete.encr_mode = 0;
    hci_send_event_packet(vhci_fd, HCI_EV_CONN_COMPLETE, &complete,
                          sizeof(complete));
    struct hci_ev_remote_features features;
    memset(&features, 0, sizeof(features));
    features.status = 0;
    features.handle = HCI_HANDLE_1;
    hci_send_event_packet(vhci_fd, HCI_EV_REMOTE_FEATURES, &features,
                          sizeof(features));
    struct {
      struct hci_ev_le_meta le_meta;
      struct hci_ev_le_conn_complete le_conn;
    } le_conn;
    memset(&le_conn, 0, sizeof(le_conn));
    le_conn.le_meta.subevent = HCI_EV_LE_CONN_COMPLETE;
    memset(&le_conn.le_conn.bdaddr, 0xaa, 6);
    *(uint8_t*)&le_conn.le_conn.bdaddr.b[5] = 0x11;
    le_conn.le_conn.role = 1;
    le_conn.le_conn.handle = HCI_HANDLE_2;
    hci_send_event_packet(vhci_fd, HCI_EV_LE_META, &le_conn, sizeof(le_conn));
    pthread_join(th, NULL);
    close(hci_sock);
  }
  
  #define XT_TABLE_SIZE 1536
  #define XT_MAX_ENTRIES 10
  
  struct xt_counters {
    uint64_t pcnt, bcnt;
  };
  
  struct ipt_getinfo {
    char name[32];
    unsigned int valid_hooks;
    unsigned int hook_entry[5];
    unsigned int underflow[5];
    unsigned int num_entries;
    unsigned int size;
  };
  
  struct ipt_get_entries {
    char name[32];
    unsigned int size;
    void* entrytable[XT_TABLE_SIZE / sizeof(void*)];
  };
  
  struct ipt_replace {
    char name[32];
    unsigned int valid_hooks;
    unsigned int num_entries;
    unsigned int size;
    unsigned int hook_entry[5];
    unsigned int underflow[5];
    unsigned int num_counters;
    struct xt_counters* counters;
    char entrytable[XT_TABLE_SIZE];
  };
  
  struct ipt_table_desc {
    const char* name;
    struct ipt_getinfo info;
    struct ipt_replace replace;
  };
  
  static struct ipt_table_desc ipv4_tables[] = {
      {.name = "filter"}, {.name = "nat"},      {.name = "mangle"},
      {.name = "raw"},    {.name = "security"},
  };
  
  static struct ipt_table_desc ipv6_tables[] = {
      {.name = "filter"}, {.name = "nat"},      {.name = "mangle"},
      {.name = "raw"},    {.name = "security"},
  };
  
  #define IPT_BASE_CTL 64
  #define IPT_SO_SET_REPLACE (IPT_BASE_CTL)
  #define IPT_SO_GET_INFO (IPT_BASE_CTL)
  #define IPT_SO_GET_ENTRIES (IPT_BASE_CTL + 1)
  
  struct arpt_getinfo {
    char name[32];
    unsigned int valid_hooks;
    unsigned int hook_entry[3];
    unsigned int underflow[3];
    unsigned int num_entries;
    unsigned int size;
  };
  
  struct arpt_get_entries {
    char name[32];
    unsigned int size;
    void* entrytable[XT_TABLE_SIZE / sizeof(void*)];
  };
  
  struct arpt_replace {
    char name[32];
    unsigned int valid_hooks;
    unsigned int num_entries;
    unsigned int size;
    unsigned int hook_entry[3];
    unsigned int underflow[3];
    unsigned int num_counters;
    struct xt_counters* counters;
    char entrytable[XT_TABLE_SIZE];
  };
  
  struct arpt_table_desc {
    const char* name;
    struct arpt_getinfo info;
    struct arpt_replace replace;
  };
  
  static struct arpt_table_desc arpt_tables[] = {
      {.name = "filter"},
  };
  
  #define ARPT_BASE_CTL 96
  #define ARPT_SO_SET_REPLACE (ARPT_BASE_CTL)
  #define ARPT_SO_GET_INFO (ARPT_BASE_CTL)
  #define ARPT_SO_GET_ENTRIES (ARPT_BASE_CTL + 1)
  
  static void checkpoint_iptables(struct ipt_table_desc* tables, int num_tables,
                                  int family, int level)
  {
    int fd = socket(family, SOCK_STREAM, IPPROTO_TCP);
    if (fd == -1) {
      switch (errno) {
      case EAFNOSUPPORT:
      case ENOPROTOOPT:
        return;
      }
      exit(1);
    }
    for (int i = 0; i < num_tables; i++) {
      struct ipt_table_desc* table = &tables[i];
      strcpy(table->info.name, table->name);
      strcpy(table->replace.name, table->name);
      socklen_t optlen = sizeof(table->info);
      if (getsockopt(fd, level, IPT_SO_GET_INFO, &table->info, &optlen)) {
        switch (errno) {
        case EPERM:
        case ENOENT:
        case ENOPROTOOPT:
          continue;
        }
        exit(1);
      }
      if (table->info.size > sizeof(table->replace.entrytable))
        exit(1);
      if (table->info.num_entries > XT_MAX_ENTRIES)
        exit(1);
      struct ipt_get_entries entries;
      memset(&entries, 0, sizeof(entries));
      strcpy(entries.name, table->name);
      entries.size = table->info.size;
      optlen = sizeof(entries) - sizeof(entries.entrytable) + table->info.size;
      if (getsockopt(fd, level, IPT_SO_GET_ENTRIES, &entries, &optlen))
        exit(1);
      table->replace.valid_hooks = table->info.valid_hooks;
      table->replace.num_entries = table->info.num_entries;
      table->replace.size = table->info.size;
      memcpy(table->replace.hook_entry, table->info.hook_entry,
             sizeof(table->replace.hook_entry));
      memcpy(table->replace.underflow, table->info.underflow,
             sizeof(table->replace.underflow));
      memcpy(table->replace.entrytable, entries.entrytable, table->info.size);
    }
    close(fd);
  }
  
  static void reset_iptables(struct ipt_table_desc* tables, int num_tables,
                             int family, int level)
  {
    int fd = socket(family, SOCK_STREAM, IPPROTO_TCP);
    if (fd == -1) {
      switch (errno) {
      case EAFNOSUPPORT:
      case ENOPROTOOPT:
        return;
      }
      exit(1);
    }
    for (int i = 0; i < num_tables; i++) {
      struct ipt_table_desc* table = &tables[i];
      if (table->info.valid_hooks == 0)
        continue;
      struct ipt_getinfo info;
      memset(&info, 0, sizeof(info));
      strcpy(info.name, table->name);
      socklen_t optlen = sizeof(info);
      if (getsockopt(fd, level, IPT_SO_GET_INFO, &info, &optlen))
        exit(1);
      if (memcmp(&table->info, &info, sizeof(table->info)) == 0) {
        struct ipt_get_entries entries;
        memset(&entries, 0, sizeof(entries));
        strcpy(entries.name, table->name);
        entries.size = table->info.size;
        optlen = sizeof(entries) - sizeof(entries.entrytable) + entries.size;
        if (getsockopt(fd, level, IPT_SO_GET_ENTRIES, &entries, &optlen))
          exit(1);
        if (memcmp(table->replace.entrytable, entries.entrytable,
                   table->info.size) == 0)
          continue;
      }
      struct xt_counters counters[XT_MAX_ENTRIES];
      table->replace.num_counters = info.num_entries;
      table->replace.counters = counters;
      optlen = sizeof(table->replace) - sizeof(table->replace.entrytable) +
               table->replace.size;
      if (setsockopt(fd, level, IPT_SO_SET_REPLACE, &table->replace, optlen))
        exit(1);
    }
    close(fd);
  }
  
  static void checkpoint_arptables(void)
  {
    int fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if (fd == -1) {
      switch (errno) {
      case EAFNOSUPPORT:
      case ENOPROTOOPT:
        return;
      }
      exit(1);
    }
    for (unsigned i = 0; i < sizeof(arpt_tables) / sizeof(arpt_tables[0]); i++) {
      struct arpt_table_desc* table = &arpt_tables[i];
      strcpy(table->info.name, table->name);
      strcpy(table->replace.name, table->name);
      socklen_t optlen = sizeof(table->info);
      if (getsockopt(fd, SOL_IP, ARPT_SO_GET_INFO, &table->info, &optlen)) {
        switch (errno) {
        case EPERM:
        case ENOENT:
        case ENOPROTOOPT:
          continue;
        }
        exit(1);
      }
      if (table->info.size > sizeof(table->replace.entrytable))
        exit(1);
      if (table->info.num_entries > XT_MAX_ENTRIES)
        exit(1);
      struct arpt_get_entries entries;
      memset(&entries, 0, sizeof(entries));
      strcpy(entries.name, table->name);
      entries.size = table->info.size;
      optlen = sizeof(entries) - sizeof(entries.entrytable) + table->info.size;
      if (getsockopt(fd, SOL_IP, ARPT_SO_GET_ENTRIES, &entries, &optlen))
        exit(1);
      table->replace.valid_hooks = table->info.valid_hooks;
      table->replace.num_entries = table->info.num_entries;
      table->replace.size = table->info.size;
      memcpy(table->replace.hook_entry, table->info.hook_entry,
             sizeof(table->replace.hook_entry));
      memcpy(table->replace.underflow, table->info.underflow,
             sizeof(table->replace.underflow));
      memcpy(table->replace.entrytable, entries.entrytable, table->info.size);
    }
    close(fd);
  }
  
  static void reset_arptables()
  {
    int fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if (fd == -1) {
      switch (errno) {
      case EAFNOSUPPORT:
      case ENOPROTOOPT:
        return;
      }
      exit(1);
    }
    for (unsigned i = 0; i < sizeof(arpt_tables) / sizeof(arpt_tables[0]); i++) {
      struct arpt_table_desc* table = &arpt_tables[i];
      if (table->info.valid_hooks == 0)
        continue;
      struct arpt_getinfo info;
      memset(&info, 0, sizeof(info));
      strcpy(info.name, table->name);
      socklen_t optlen = sizeof(info);
      if (getsockopt(fd, SOL_IP, ARPT_SO_GET_INFO, &info, &optlen))
        exit(1);
      if (memcmp(&table->info, &info, sizeof(table->info)) == 0) {
        struct arpt_get_entries entries;
        memset(&entries, 0, sizeof(entries));
        strcpy(entries.name, table->name);
        entries.size = table->info.size;
        optlen = sizeof(entries) - sizeof(entries.entrytable) + entries.size;
        if (getsockopt(fd, SOL_IP, ARPT_SO_GET_ENTRIES, &entries, &optlen))
          exit(1);
        if (memcmp(table->replace.entrytable, entries.entrytable,
                   table->info.size) == 0)
          continue;
      } else {
      }
      struct xt_counters counters[XT_MAX_ENTRIES];
      table->replace.num_counters = info.num_entries;
      table->replace.counters = counters;
      optlen = sizeof(table->replace) - sizeof(table->replace.entrytable) +
               table->replace.size;
      if (setsockopt(fd, SOL_IP, ARPT_SO_SET_REPLACE, &table->replace, optlen))
        exit(1);
    }
    close(fd);
  }
  
  #define NF_BR_NUMHOOKS 6
  #define EBT_TABLE_MAXNAMELEN 32
  #define EBT_CHAIN_MAXNAMELEN 32
  #define EBT_BASE_CTL 128
  #define EBT_SO_SET_ENTRIES (EBT_BASE_CTL)
  #define EBT_SO_GET_INFO (EBT_BASE_CTL)
  #define EBT_SO_GET_ENTRIES (EBT_SO_GET_INFO + 1)
  #define EBT_SO_GET_INIT_INFO (EBT_SO_GET_ENTRIES + 1)
  #define EBT_SO_GET_INIT_ENTRIES (EBT_SO_GET_INIT_INFO + 1)
  
  struct ebt_replace {
    char name[EBT_TABLE_MAXNAMELEN];
    unsigned int valid_hooks;
    unsigned int nentries;
    unsigned int entries_size;
    struct ebt_entries* hook_entry[NF_BR_NUMHOOKS];
    unsigned int num_counters;
    struct ebt_counter* counters;
    char* entries;
  };
  
  struct ebt_entries {
    unsigned int distinguisher;
    char name[EBT_CHAIN_MAXNAMELEN];
    unsigned int counter_offset;
    int policy;
    unsigned int nentries;
    char data[0] __attribute__((aligned(__alignof__(struct ebt_replace))));
  };
  
  struct ebt_table_desc {
    const char* name;
    struct ebt_replace replace;
    char entrytable[XT_TABLE_SIZE];
  };
  
  static struct ebt_table_desc ebt_tables[] = {
      {.name = "filter"},
      {.name = "nat"},
      {.name = "broute"},
  };
  
  static void checkpoint_ebtables(void)
  {
    int fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if (fd == -1) {
      switch (errno) {
      case EAFNOSUPPORT:
      case ENOPROTOOPT:
        return;
      }
      exit(1);
    }
    for (size_t i = 0; i < sizeof(ebt_tables) / sizeof(ebt_tables[0]); i++) {
      struct ebt_table_desc* table = &ebt_tables[i];
      strcpy(table->replace.name, table->name);
      socklen_t optlen = sizeof(table->replace);
      if (getsockopt(fd, SOL_IP, EBT_SO_GET_INIT_INFO, &table->replace,
                     &optlen)) {
        switch (errno) {
        case EPERM:
        case ENOENT:
        case ENOPROTOOPT:
          continue;
        }
        exit(1);
      }
      if (table->replace.entries_size > sizeof(table->entrytable))
        exit(1);
      table->replace.num_counters = 0;
      table->replace.entries = table->entrytable;
      optlen = sizeof(table->replace) + table->replace.entries_size;
      if (getsockopt(fd, SOL_IP, EBT_SO_GET_INIT_ENTRIES, &table->replace,
                     &optlen))
        exit(1);
    }
    close(fd);
  }
  
  static void reset_ebtables()
  {
    int fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if (fd == -1) {
      switch (errno) {
      case EAFNOSUPPORT:
      case ENOPROTOOPT:
        return;
      }
      exit(1);
    }
    for (unsigned i = 0; i < sizeof(ebt_tables) / sizeof(ebt_tables[0]); i++) {
      struct ebt_table_desc* table = &ebt_tables[i];
      if (table->replace.valid_hooks == 0)
        continue;
      struct ebt_replace replace;
      memset(&replace, 0, sizeof(replace));
      strcpy(replace.name, table->name);
      socklen_t optlen = sizeof(replace);
      if (getsockopt(fd, SOL_IP, EBT_SO_GET_INFO, &replace, &optlen))
        exit(1);
      replace.num_counters = 0;
      table->replace.entries = 0;
      for (unsigned h = 0; h < NF_BR_NUMHOOKS; h++)
        table->replace.hook_entry[h] = 0;
      if (memcmp(&table->replace, &replace, sizeof(table->replace)) == 0) {
        char entrytable[XT_TABLE_SIZE];
        memset(&entrytable, 0, sizeof(entrytable));
        replace.entries = entrytable;
        optlen = sizeof(replace) + replace.entries_size;
        if (getsockopt(fd, SOL_IP, EBT_SO_GET_ENTRIES, &replace, &optlen))
          exit(1);
        if (memcmp(table->entrytable, entrytable, replace.entries_size) == 0)
          continue;
      }
      for (unsigned j = 0, h = 0; h < NF_BR_NUMHOOKS; h++) {
        if (table->replace.valid_hooks & (1 << h)) {
          table->replace.hook_entry[h] =
              (struct ebt_entries*)table->entrytable + j;
          j++;
        }
      }
      table->replace.entries = table->entrytable;
      optlen = sizeof(table->replace) + table->replace.entries_size;
      if (setsockopt(fd, SOL_IP, EBT_SO_SET_ENTRIES, &table->replace, optlen))
        exit(1);
    }
    close(fd);
  }
  
  static void checkpoint_net_namespace(void)
  {
    checkpoint_ebtables();
    checkpoint_arptables();
    checkpoint_iptables(ipv4_tables, sizeof(ipv4_tables) / sizeof(ipv4_tables[0]),
                        AF_INET, SOL_IP);
    checkpoint_iptables(ipv6_tables, sizeof(ipv6_tables) / sizeof(ipv6_tables[0]),
                        AF_INET6, SOL_IPV6);
  }
  
  static void reset_net_namespace(void)
  {
    reset_ebtables();
    reset_arptables();
    reset_iptables(ipv4_tables, sizeof(ipv4_tables) / sizeof(ipv4_tables[0]),
                   AF_INET, SOL_IP);
    reset_iptables(ipv6_tables, sizeof(ipv6_tables) / sizeof(ipv6_tables[0]),
                   AF_INET6, SOL_IPV6);
  }
  
  static void setup_cgroups()
  {
    if (mkdir("/syzcgroup", 0777)) {
    }
    if (mkdir("/syzcgroup/unified", 0777)) {
    }
    if (mount("none", "/syzcgroup/unified", "cgroup2", 0, NULL)) {
    }
    if (chmod("/syzcgroup/unified", 0777)) {
    }
    write_file("/syzcgroup/unified/cgroup.subtree_control",
               "+cpu +memory +io +pids +rdma");
    if (mkdir("/syzcgroup/cpu", 0777)) {
    }
    if (mount("none", "/syzcgroup/cpu", "cgroup", 0,
              "cpuset,cpuacct,perf_event,hugetlb")) {
    }
    write_file("/syzcgroup/cpu/cgroup.clone_children", "1");
    write_file("/syzcgroup/cpu/cpuset.memory_pressure_enabled", "1");
    if (chmod("/syzcgroup/cpu", 0777)) {
    }
    if (mkdir("/syzcgroup/net", 0777)) {
    }
    if (mount("none", "/syzcgroup/net", "cgroup", 0,
              "net_cls,net_prio,devices,freezer")) {
    }
    if (chmod("/syzcgroup/net", 0777)) {
    }
  }
  
  static void setup_cgroups_loop()
  {
    int pid = getpid();
    char file[128];
    char cgroupdir[64];
    snprintf(cgroupdir, sizeof(cgroupdir), "/syzcgroup/unified/syz%llu", procid);
    if (mkdir(cgroupdir, 0777)) {
    }
    snprintf(file, sizeof(file), "%s/pids.max", cgroupdir);
    write_file(file, "32");
    snprintf(file, sizeof(file), "%s/memory.low", cgroupdir);
    write_file(file, "%d", 298 << 20);
    snprintf(file, sizeof(file), "%s/memory.high", cgroupdir);
    write_file(file, "%d", 299 << 20);
    snprintf(file, sizeof(file), "%s/memory.max", cgroupdir);
    write_file(file, "%d", 300 << 20);
    snprintf(file, sizeof(file), "%s/cgroup.procs", cgroupdir);
    write_file(file, "%d", pid);
    snprintf(cgroupdir, sizeof(cgroupdir), "/syzcgroup/cpu/syz%llu", procid);
    if (mkdir(cgroupdir, 0777)) {
    }
    snprintf(file, sizeof(file), "%s/cgroup.procs", cgroupdir);
    write_file(file, "%d", pid);
    snprintf(cgroupdir, sizeof(cgroupdir), "/syzcgroup/net/syz%llu", procid);
    if (mkdir(cgroupdir, 0777)) {
    }
    snprintf(file, sizeof(file), "%s/cgroup.procs", cgroupdir);
    write_file(file, "%d", pid);
  }
  
  static void setup_cgroups_test()
  {
    char cgroupdir[64];
    snprintf(cgroupdir, sizeof(cgroupdir), "/syzcgroup/unified/syz%llu", procid);
    if (symlink(cgroupdir, "./cgroup")) {
    }
    snprintf(cgroupdir, sizeof(cgroupdir), "/syzcgroup/cpu/syz%llu", procid);
    if (symlink(cgroupdir, "./cgroup.cpu")) {
    }
    snprintf(cgroupdir, sizeof(cgroupdir), "/syzcgroup/net/syz%llu", procid);
    if (symlink(cgroupdir, "./cgroup.net")) {
    }
  }
  
  static void setup_common()
  {
    if (mount(0, "/sys/fs/fuse/connections", "fusectl", 0, 0)) {
    }
    setup_cgroups();
  }
  
  static void loop();
  
  static void sandbox_common()
  {
    prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
    setpgrp();
    setsid();
    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 = 0;
    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);
    setup_common();
    initialize_vhci();
    sandbox_common();
    drop_caps();
    initialize_netdevices_init();
    if (unshare(CLONE_NEWNET)) {
    }
    initialize_tun();
    initialize_netdevices();
    loop();
    exit(1);
  }
  
  #define FS_IOC_SETFLAGS _IOW('f', 2, long)
  static void remove_dir(const char* dir)
  {
    int iter = 0;
    DIR* dp = 0;
  retry:
    while (umount2(dir, MNT_DETACH) == 0) {
    }
    dp = opendir(dir);
    if (dp == NULL) {
      if (errno == EMFILE) {
        exit(1);
      }
      exit(1);
    }
    struct dirent* ep = 0;
    while ((ep = readdir(dp))) {
      if (strcmp(ep->d_name, ".") == 0 || strcmp(ep->d_name, "..") == 0)
        continue;
      char filename[FILENAME_MAX];
      snprintf(filename, sizeof(filename), "%s/%s", dir, ep->d_name);
      while (umount2(filename, MNT_DETACH) == 0) {
      }
      struct stat st;
      if (lstat(filename, &st))
        exit(1);
      if (S_ISDIR(st.st_mode)) {
        remove_dir(filename);
        continue;
      }
      int i;
      for (i = 0;; i++) {
        if (unlink(filename) == 0)
          break;
        if (errno == EPERM) {
          int fd = open(filename, O_RDONLY);
          if (fd != -1) {
            long flags = 0;
            if (ioctl(fd, FS_IOC_SETFLAGS, &flags) == 0) {
            }
            close(fd);
            continue;
          }
        }
        if (errno == EROFS) {
          break;
        }
        if (errno != EBUSY || i > 100)
          exit(1);
        if (umount2(filename, MNT_DETACH))
          exit(1);
      }
    }
    closedir(dp);
    for (int i = 0;; i++) {
      if (rmdir(dir) == 0)
        break;
      if (i < 100) {
        if (errno == EPERM) {
          int fd = open(dir, O_RDONLY);
          if (fd != -1) {
            long flags = 0;
            if (ioctl(fd, FS_IOC_SETFLAGS, &flags) == 0) {
            }
            close(fd);
            continue;
          }
        }
        if (errno == EROFS) {
          break;
        }
        if (errno == EBUSY) {
          if (umount2(dir, MNT_DETACH))
            exit(1);
          continue;
        }
        if (errno == ENOTEMPTY) {
          if (iter < 100) {
            iter++;
            goto retry;
          }
        }
      }
      exit(1);
    }
  }
  
  static void kill_and_wait(int pid, int* status)
  {
    kill(-pid, SIGKILL);
    kill(pid, SIGKILL);
    for (int i = 0; i < 100; i++) {
      if (waitpid(-1, status, WNOHANG | __WALL) == pid)
        return;
      usleep(1000);
    }
    DIR* dir = opendir("/sys/fs/fuse/connections");
    if (dir) {
      for (;;) {
        struct dirent* ent = readdir(dir);
        if (!ent)
          break;
        if (strcmp(ent->d_name, ".") == 0 || strcmp(ent->d_name, "..") == 0)
          continue;
        char abort[300];
        snprintf(abort, sizeof(abort), "/sys/fs/fuse/connections/%s/abort",
                 ent->d_name);
        int fd = open(abort, O_WRONLY);
        if (fd == -1) {
          continue;
        }
        if (write(fd, abort, 1) < 0) {
        }
        close(fd);
      }
      closedir(dir);
    } else {
    }
    while (waitpid(-1, status, __WALL) != pid) {
    }
  }
  
  static void setup_loop()
  {
    setup_cgroups_loop();
    checkpoint_net_namespace();
  }
  
  static void reset_loop()
  {
    reset_net_namespace();
  }
  
  static void setup_test()
  {
    prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
    setpgrp();
    setup_cgroups_test();
    write_file("/proc/self/oom_score_adj", "1000");
    flush_tun();
  }
  
  static void close_fds()
  {
    for (int fd = 3; fd < MAX_FDS; fd++)
      close(fd);
  }
  
  static void setup_binfmt_misc()
  {
    if (mount(0, "/proc/sys/fs/binfmt_misc", "binfmt_misc", 0, 0)) {
    }
    write_file("/proc/sys/fs/binfmt_misc/register", ":syz0:M:0:\x01::./file0:");
    write_file("/proc/sys/fs/binfmt_misc/register",
               ":syz1:M:1:\x02::./file0:POC");
  }
  
  struct thread_t {
    int created, call;
    event_t ready, done;
  };
  
  static struct thread_t threads[16];
  static void execute_call(int call);
  static int running;
  
  static void* thr(void* arg)
  {
    struct thread_t* th = (struct thread_t*)arg;
    for (;;) {
      event_wait(&th->ready);
      event_reset(&th->ready);
      execute_call(th->call);
      __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED);
      event_set(&th->done);
    }
    return 0;
  }
  
  static void execute_one(void)
  {
    int i, call, thread;
    int collide = 0;
  again:
    for (call = 0; call < 6; call++) {
      for (thread = 0; thread < (int)(sizeof(threads) / sizeof(threads[0]));
           thread++) {
        struct thread_t* th = &threads[thread];
        if (!th->created) {
          th->created = 1;
          event_init(&th->ready);
          event_init(&th->done);
          event_set(&th->done);
          thread_start(thr, th);
        }
        if (!event_isset(&th->done))
          continue;
        event_reset(&th->done);
        th->call = call;
        __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED);
        event_set(&th->ready);
        if (collide && (call % 2) == 0)
          break;
        event_timedwait(&th->done, 45);
        break;
      }
    }
    for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++)
      sleep_ms(1);
    close_fds();
    if (!collide) {
      collide = 1;
      goto again;
    }
  }
  
  static void execute_one(void);
  
  #define WAIT_FLAGS __WALL
  
  static void loop(void)
  {
    setup_loop();
    int iter = 0;
    for (;; iter++) {
      char cwdbuf[32];
      sprintf(cwdbuf, "./%d", iter);
      if (mkdir(cwdbuf, 0777))
        exit(1);
      reset_loop();
      int pid = fork();
      if (pid < 0)
        exit(1);
      if (pid == 0) {
        if (chdir(cwdbuf))
          exit(1);
        setup_test();
        execute_one();
        exit(0);
      }
      int status = 0;
      uint64_t start = current_time_ms();
      for (;;) {
        if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid)
          break;
        sleep_ms(1);
        if (current_time_ms() - start < 5 * 1000)
          continue;
        kill_and_wait(pid, &status);
        break;
      }
      remove_dir(cwdbuf);
    }
  }
  
  uint64_t r[3] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff};
  
  void execute_call(int call)
  {
    intptr_t res = 0;
    switch (call) {
    case 0:
      NONFAILING(*(uint32_t*)0x20940000 = 2);
      NONFAILING(*(uint32_t*)0x20940004 = 0x70);
      NONFAILING(*(uint8_t*)0x20940008 = 0xfe);
      NONFAILING(*(uint8_t*)0x20940009 = 0);
      NONFAILING(*(uint8_t*)0x2094000a = 0);
      NONFAILING(*(uint8_t*)0x2094000b = 0);
      NONFAILING(*(uint32_t*)0x2094000c = 0);
      NONFAILING(*(uint64_t*)0x20940010 = 0);
      NONFAILING(*(uint64_t*)0x20940018 = 0);
      NONFAILING(*(uint64_t*)0x20940020 = 0);
      NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20940028, 0, 0, 1));
      NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20940028, 0, 1, 1));
      NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20940028, 0, 2, 1));
      NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20940028, 0, 3, 1));
      NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20940028, 0, 4, 1));
      NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20940028, 3, 5, 1));
      NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20940028, 0, 6, 1));
      NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20940028, 0, 7, 1));
      NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20940028, 0, 8, 1));
      NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20940028, 0, 9, 1));
      NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20940028, 0, 10, 1));
      NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20940028, 0, 11, 1));
      NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20940028, 0, 12, 1));
      NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20940028, 0, 13, 1));
      NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20940028, 0, 14, 1));
      NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20940028, 0, 15, 2));
      NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20940028, 0, 17, 1));
      NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20940028, 0, 18, 1));
      NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20940028, 0, 19, 1));
      NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20940028, 0, 20, 1));
      NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20940028, 0, 21, 1));
      NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20940028, 0, 22, 1));
      NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20940028, 0, 23, 1));
      NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20940028, 0, 24, 1));
      NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20940028, 0, 25, 1));
      NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20940028, 0, 26, 1));
      NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20940028, 0, 27, 1));
      NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20940028, 0, 28, 1));
      NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20940028, 0, 29, 35));
      NONFAILING(*(uint32_t*)0x20940030 = 0);
      NONFAILING(*(uint32_t*)0x20940034 = 0);
      NONFAILING(*(uint64_t*)0x20940038 = 0);
      NONFAILING(*(uint64_t*)0x20940040 = 0);
      NONFAILING(*(uint64_t*)0x20940048 = 0);
      NONFAILING(*(uint64_t*)0x20940050 = 0);
      NONFAILING(*(uint32_t*)0x20940058 = 0);
      NONFAILING(*(uint32_t*)0x2094005c = 0);
      NONFAILING(*(uint64_t*)0x20940060 = 0);
      NONFAILING(*(uint32_t*)0x20940068 = 0);
      NONFAILING(*(uint16_t*)0x2094006c = 0);
      NONFAILING(*(uint16_t*)0x2094006e = 0);
      syscall(__NR_perf_event_open, 0x20940000ul, 0, 0ul, -1, 0ul);
      break;
    case 1:
      res = syscall(__NR_epoll_create1, 0ul);
      if (res != -1)
        r[0] = res;
      break;
    case 2:
      res = syscall(__NR_socket, 0xaul, 2ul, 0);
      if (res != -1)
        r[1] = res;
      break;
    case 3:
      NONFAILING(*(uint32_t*)0x200000c0 = 0x2000301e);
      NONFAILING(*(uint64_t*)0x200000c4 = 0);
      syscall(__NR_epoll_ctl, r[0], 1ul, r[1], 0x200000c0ul);
      break;
    case 4:
      res = syscall(__NR_epoll_create1, 0ul);
      if (res != -1)
        r[2] = res;
      break;
    case 5:
      NONFAILING(*(uint32_t*)0x20000000 = 0);
      NONFAILING(*(uint64_t*)0x20000004 = 0);
      syscall(__NR_epoll_ctl, r[2], 1ul, r[0], 0x20000000ul);
      break;
    }
  }
  int main(void)
  {
    syscall(__NR_mmap, 0x1ffff000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul);
    syscall(__NR_mmap, 0x20000000ul, 0x1000000ul, 7ul, 0x32ul, -1, 0ul);
    syscall(__NR_mmap, 0x21000000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul);
    setup_binfmt_misc();
    install_segv_handler();
    use_temporary_dir();
    do_sandbox_none();
    return 0;
  }
  