// https://syzkaller.appspot.com/bug?id=63b97fe984aeddd828caa697cc0685ca99227bfa
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE
#include <arpa/inet.h>
#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <linux/futex.h>
#include <linux/if.h>
#include <linux/if_ether.h>
#include <linux/if_tun.h>
#include <linux/ip.h>
#include <linux/tcp.h>
#include <net/if_arp.h>
#include <pthread.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/uio.h>
#include <unistd.h>

__attribute__((noreturn)) static void doexit(int status)
{
  volatile unsigned i;
  syscall(__NR_exit_group, status);
  for (i = 0;; i++) {
  }
}
#include <stdint.h>
#include <string.h>

const int kFailStatus = 67;
const int kRetryStatus = 69;

static void fail(const char* msg, ...)
{
  int e = errno;
  va_list args;
  va_start(args, msg);
  vfprintf(stderr, msg, args);
  va_end(args);
  fprintf(stderr, " (errno %d)\n", e);
  doexit((e == ENOMEM || e == EAGAIN) ? kRetryStatus : kFailStatus);
}

#define BITMASK_LEN(type, bf_len) (type)((1ull << (bf_len)) - 1)

#define BITMASK_LEN_OFF(type, bf_off, bf_len)                                  \
  (type)(BITMASK_LEN(type, (bf_len)) << (bf_off))

#define STORE_BY_BITMASK(type, addr, val, bf_off, bf_len)                      \
  if ((bf_off) == 0 && (bf_len) == 0) {                                        \
    *(type*)(addr) = (type)(val);                                              \
  } else {                                                                     \
    type new_val = *(type*)(addr);                                             \
    new_val &= ~BITMASK_LEN_OFF(type, (bf_off), (bf_len));                     \
    new_val |= ((type)(val)&BITMASK_LEN(type, (bf_len))) << (bf_off);          \
    *(type*)(addr) = new_val;                                                  \
  }

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;
  for (i = 0; i < length - 1; i += 2)
    csum->acc += *(uint16_t*)&data[i];

  if (length & 1)
    csum->acc += (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 void vsnprintf_check(char* str, size_t size, const char* format,
                            va_list args)
{
  int rv;

  rv = vsnprintf(str, size, format, args);
  if (rv < 0)
    fail("tun: snprintf failed");
  if ((size_t)rv >= size)
    fail("tun: string '%s...' doesn't fit into buffer", str);
}

static void snprintf_check(char* str, size_t size, const char* format, ...)
{
  va_list args;

  va_start(args, format);
  vsnprintf_check(str, size, format, args);
  va_end(args);
}

#define COMMAND_MAX_LEN 128
#define PATH_PREFIX                                                            \
  "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin "
#define PATH_PREFIX_LEN (sizeof(PATH_PREFIX) - 1)

static void execute_command(bool panic, const char* format, ...)
{
  va_list args;
  char command[PATH_PREFIX_LEN + COMMAND_MAX_LEN];
  int rv;

  va_start(args, format);
  memcpy(command, PATH_PREFIX, PATH_PREFIX_LEN);
  vsnprintf_check(command + PATH_PREFIX_LEN, COMMAND_MAX_LEN, format, args);
  rv = system(command);
  if (panic && rv != 0)
    fail("tun: command \"%s\" failed with code %d", &command[0], rv);

  va_end(args);
}

static int tunfd = -1;
static int tun_frags_enabled;

#define SYZ_TUN_MAX_PACKET_SIZE 1000

#define MAX_PIDS 32
#define ADDR_MAX_LEN 32

#define LOCAL_MAC "aa:aa:aa:aa:%02hx:aa"
#define REMOTE_MAC "aa:aa:aa:aa:%02hx:bb"

#define LOCAL_IPV4 "172.20.%d.170"
#define REMOTE_IPV4 "172.20.%d.187"

#define LOCAL_IPV6 "fe80::%02hx:aa"
#define REMOTE_IPV6 "fe80::%02hx:bb"

#define IFF_NAPI 0x0010
#define IFF_NAPI_FRAGS 0x0020

static void initialize_tun(int id)
{
  if (id >= MAX_PIDS)
    fail("tun: no more than %d executors", MAX_PIDS);

  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;
  }

  char iface[IFNAMSIZ];
  snprintf_check(iface, sizeof(iface), "syz%d", id);

  struct ifreq ifr;
  memset(&ifr, 0, sizeof(ifr));
  strncpy(ifr.ifr_name, iface, IFNAMSIZ);
  ifr.ifr_flags = IFF_TAP | IFF_NO_PI | IFF_NAPI | IFF_NAPI_FRAGS;
  if (ioctl(tunfd, TUNSETIFF, (void*)&ifr) < 0) {
    ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
    if (ioctl(tunfd, TUNSETIFF, (void*)&ifr) < 0)
      fail("tun: ioctl(TUNSETIFF) failed");
  }
  if (ioctl(tunfd, TUNGETIFF, (void*)&ifr) < 0)
    fail("tun: ioctl(TUNGETIFF) failed");
  tun_frags_enabled = (ifr.ifr_flags & IFF_NAPI_FRAGS) != 0;

  char local_mac[ADDR_MAX_LEN];
  snprintf_check(local_mac, sizeof(local_mac), LOCAL_MAC, id);
  char remote_mac[ADDR_MAX_LEN];
  snprintf_check(remote_mac, sizeof(remote_mac), REMOTE_MAC, id);

  char local_ipv4[ADDR_MAX_LEN];
  snprintf_check(local_ipv4, sizeof(local_ipv4), LOCAL_IPV4, id);
  char remote_ipv4[ADDR_MAX_LEN];
  snprintf_check(remote_ipv4, sizeof(remote_ipv4), REMOTE_IPV4, id);

  char local_ipv6[ADDR_MAX_LEN];
  snprintf_check(local_ipv6, sizeof(local_ipv6), LOCAL_IPV6, id);
  char remote_ipv6[ADDR_MAX_LEN];
  snprintf_check(remote_ipv6, sizeof(remote_ipv6), REMOTE_IPV6, id);

  execute_command(1, "sysctl -w net.ipv6.conf.%s.accept_dad=0", iface);

  execute_command(1, "sysctl -w net.ipv6.conf.%s.router_solicitations=0",
                  iface);

  execute_command(1, "ip link set dev %s address %s", iface, local_mac);
  execute_command(1, "ip addr add %s/24 dev %s", local_ipv4, iface);
  execute_command(1, "ip -6 addr add %s/120 dev %s", local_ipv6, iface);
  execute_command(1, "ip neigh add %s lladdr %s dev %s nud permanent",
                  remote_ipv4, remote_mac, iface);
  execute_command(1, "ip -6 neigh add %s lladdr %s dev %s nud permanent",
                  remote_ipv6, remote_mac, iface);
  execute_command(1, "ip link set dev %s up", iface);
}

#define DEV_IPV4 "172.20.%d.%d"
#define DEV_IPV6 "fe80::%02hx:%02hx"
#define DEV_MAC "aa:aa:aa:aa:%02hx:%02hx"

static void initialize_netdevices(int id)
{
  unsigned i;
  const char* devtypes[] = {"ip6gretap", "bridge", "vcan"};
  const char* devnames[] = {"lo",       "sit0",    "bridge0", "vcan0",
                            "tunl0",    "gre0",    "gretap0", "ip_vti0",
                            "ip6_vti0", "ip6tnl0", "ip6gre0", "ip6gretap0",
                            "erspan0"};

  for (i = 0; i < sizeof(devtypes) / (sizeof(devtypes[0])); i++)
    execute_command(0, "ip link add dev %s0 type %s", devtypes[i], devtypes[i]);
  for (i = 0; i < sizeof(devnames) / (sizeof(devnames[0])); i++) {
    char addr[ADDR_MAX_LEN];
    snprintf_check(addr, sizeof(addr), DEV_IPV4, id, id + 10);
    execute_command(0, "ip -4 addr add %s/24 dev %s", addr, devnames[i]);
    snprintf_check(addr, sizeof(addr), DEV_IPV6, id, id + 10);
    execute_command(0, "ip -6 addr add %s/120 dev %s", addr, devnames[i]);
    snprintf_check(addr, sizeof(addr), DEV_MAC, id, id + 10);
    execute_command(0, "ip link set dev %s address %s", devnames[i], addr);
    execute_command(0, "ip link set dev %s up", devnames[i]);
  }
}

static void setup_tun(uint64_t pid, bool enable_tun)
{
  if (enable_tun) {
    initialize_tun(pid);
    initialize_netdevices(pid);
  }
}

#define MAX_FRAGS 4
struct vnet_fragmentation {
  uint32_t full;
  uint32_t count;
  uint32_t frags[MAX_FRAGS];
};

static uintptr_t syz_emit_ethernet(uintptr_t a0, uintptr_t a1, uintptr_t a2)
{
  if (tunfd < 0)
    return (uintptr_t)-1;

  uint32_t length = a0;
  char* data = (char*)a1;

  struct vnet_fragmentation* frags = (struct vnet_fragmentation*)a2;
  struct iovec vecs[MAX_FRAGS + 1];
  uint32_t nfrags = 0;
  if (!tun_frags_enabled || frags == NULL) {
    vecs[nfrags].iov_base = data;
    vecs[nfrags].iov_len = length;
    nfrags++;
  } else {
    bool full = true;
    uint32_t i, count = 0;
    full = frags->full;
    count = frags->count;
    if (count > MAX_FRAGS)
      count = MAX_FRAGS;
    for (i = 0; i < count && length != 0; i++) {
      uint32_t size = 0;
      size = frags->frags[i];
      if (size > length)
        size = length;
      vecs[nfrags].iov_base = data;
      vecs[nfrags].iov_len = size;
      nfrags++;
      data += size;
      length -= size;
    }
    if (length != 0 && (full || nfrags == 0)) {
      vecs[nfrags].iov_base = data;
      vecs[nfrags].iov_len = length;
      nfrags++;
    }
  }
  return writev(tunfd, vecs, nfrags);
}

static void test();

void loop()
{
  while (1) {
    test();
  }
}

struct thread_t {
  int created, running, call;
  pthread_t th;
};

static struct thread_t threads[16];
static void execute_call(int call);
static int running;
static int collide;

static void* thr(void* arg)
{
  struct thread_t* th = (struct thread_t*)arg;
  for (;;) {
    while (!__atomic_load_n(&th->running, __ATOMIC_ACQUIRE))
      syscall(SYS_futex, &th->running, FUTEX_WAIT, 0, 0);
    execute_call(th->call);
    __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED);
    __atomic_store_n(&th->running, 0, __ATOMIC_RELEASE);
    syscall(SYS_futex, &th->running, FUTEX_WAKE);
  }
  return 0;
}

static void execute(int num_calls)
{
  int call, thread;
  running = 0;
  for (call = 0; call < num_calls; call++) {
    for (thread = 0; thread < sizeof(threads) / sizeof(threads[0]); thread++) {
      struct thread_t* th = &threads[thread];
      if (!th->created) {
        th->created = 1;
        pthread_attr_t attr;
        pthread_attr_init(&attr);
        pthread_attr_setstacksize(&attr, 128 << 10);
        pthread_create(&th->th, &attr, thr, th);
      }
      if (!__atomic_load_n(&th->running, __ATOMIC_ACQUIRE)) {
        th->call = call;
        __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED);
        __atomic_store_n(&th->running, 1, __ATOMIC_RELEASE);
        syscall(SYS_futex, &th->running, FUTEX_WAKE);
        if (collide && call % 2)
          break;
        struct timespec ts;
        ts.tv_sec = 0;
        ts.tv_nsec = 20 * 1000 * 1000;
        syscall(SYS_futex, &th->running, FUTEX_WAIT, 1, &ts);
        if (running)
          usleep((call == num_calls - 1) ? 10000 : 1000);
        break;
      }
    }
  }
}

long r[1];
uint64_t procid;
void execute_call(int call)
{
  switch (call) {
  case 0:
    syscall(__NR_mmap, 0x20000000, 0xfff000, 3, 0x32, -1, 0);
    break;
  case 1:
    r[0] = syscall(__NR_socket, 2, 3, 1);
    break;
  case 2:
    memcpy((void*)0x204a0c98, "\x73\x65\x63\x75\x72\x69\x74\x79\x00\x00\x00\x00"
                              "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
                              "\x00\x00\x00\x00\x00\x00\x00\x00",
           32);
    *(uint32_t*)0x204a0cb8 = 0xe;
    *(uint32_t*)0x204a0cbc = 4;
    *(uint32_t*)0x204a0cc0 = 0x308;
    *(uint32_t*)0x204a0cc4 = -1;
    *(uint32_t*)0x204a0cc8 = 0;
    *(uint32_t*)0x204a0ccc = 0xd0;
    *(uint32_t*)0x204a0cd0 = 0xd0;
    *(uint32_t*)0x204a0cd4 = -1;
    *(uint32_t*)0x204a0cd8 = -1;
    *(uint32_t*)0x204a0cdc = 0x270;
    *(uint32_t*)0x204a0ce0 = 0x270;
    *(uint32_t*)0x204a0ce4 = 0x270;
    *(uint32_t*)0x204a0ce8 = -1;
    *(uint32_t*)0x204a0cec = 4;
    *(uint64_t*)0x204a0cf0 = 0x20895fc0;
    *(uint8_t*)0x204a0cf8 = 0xac;
    *(uint8_t*)0x204a0cf9 = 0x14;
    *(uint8_t*)0x204a0cfa = 0;
    *(uint8_t*)0x204a0cfb = 0xbb;
    *(uint32_t*)0x204a0cfc = htobe32(-1);
    *(uint32_t*)0x204a0d00 = htobe32(0);
    *(uint32_t*)0x204a0d04 = htobe32(-1);
    *(uint8_t*)0x204a0d08 = 0x73;
    *(uint8_t*)0x204a0d09 = 0x79;
    *(uint8_t*)0x204a0d0a = 0x7a;
    *(uint8_t*)0x204a0d0b = 0x30 + procid * 1;
    *(uint8_t*)0x204a0d0c = 0;
    memcpy((void*)0x204a0d18,
           "\x8d\xb9\xa7\xe0\x6f\x76\xcc\x93\x68\xa6\x3e\x97\xc7\x65\xae\x70",
           16);
    *(uint8_t*)0x204a0d28 = 0;
    *(uint8_t*)0x204a0d29 = 0;
    *(uint8_t*)0x204a0d2a = 0;
    *(uint8_t*)0x204a0d2b = 0;
    *(uint8_t*)0x204a0d2c = 0;
    *(uint8_t*)0x204a0d2d = 0;
    *(uint8_t*)0x204a0d2e = 0;
    *(uint8_t*)0x204a0d2f = 0;
    *(uint8_t*)0x204a0d30 = 0;
    *(uint8_t*)0x204a0d31 = 0;
    *(uint8_t*)0x204a0d32 = 0;
    *(uint8_t*)0x204a0d33 = 0;
    *(uint8_t*)0x204a0d34 = 0;
    *(uint8_t*)0x204a0d35 = 0;
    *(uint8_t*)0x204a0d36 = 0;
    *(uint8_t*)0x204a0d37 = 0;
    *(uint8_t*)0x204a0d38 = 0;
    *(uint8_t*)0x204a0d39 = 0;
    *(uint8_t*)0x204a0d3a = 0;
    *(uint8_t*)0x204a0d3b = 0;
    *(uint8_t*)0x204a0d3c = 0;
    *(uint8_t*)0x204a0d3d = 0;
    *(uint8_t*)0x204a0d3e = 0;
    *(uint8_t*)0x204a0d3f = 0;
    *(uint8_t*)0x204a0d40 = 0;
    *(uint8_t*)0x204a0d41 = 0;
    *(uint8_t*)0x204a0d42 = 0;
    *(uint8_t*)0x204a0d43 = 0;
    *(uint8_t*)0x204a0d44 = 0;
    *(uint8_t*)0x204a0d45 = 0;
    *(uint8_t*)0x204a0d46 = 0;
    *(uint8_t*)0x204a0d47 = 0;
    *(uint16_t*)0x204a0d48 = 0;
    *(uint8_t*)0x204a0d4a = 0;
    *(uint8_t*)0x204a0d4b = 0;
    *(uint32_t*)0x204a0d4c = 0;
    *(uint16_t*)0x204a0d50 = 0x70;
    *(uint16_t*)0x204a0d52 = 0xd0;
    *(uint32_t*)0x204a0d54 = 0;
    *(uint64_t*)0x204a0d58 = 0;
    *(uint64_t*)0x204a0d60 = 0;
    *(uint16_t*)0x204a0d68 = 0x60;
    memcpy((void*)0x204a0d6a, "\x43\x4c\x55\x53\x54\x45\x52\x49\x50\x00\x00\x00"
                              "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
                              "\x00\x00\x00\x00\x00",
           29);
    *(uint8_t*)0x204a0d87 = 0;
    *(uint32_t*)0x204a0d88 = 1;
    *(uint8_t*)0x204a0d8c = 1;
    *(uint8_t*)0x204a0d8d = 0x80;
    *(uint8_t*)0x204a0d8e = 0xc2;
    *(uint8_t*)0x204a0d8f = 0;
    *(uint8_t*)0x204a0d90 = 0;
    *(uint8_t*)0x204a0d91 = 0;
    *(uint16_t*)0x204a0d92 = 0;
    *(uint16_t*)0x204a0d94 = 0;
    *(uint16_t*)0x204a0d96 = 0;
    *(uint16_t*)0x204a0d98 = 0;
    *(uint16_t*)0x204a0d9a = 0;
    *(uint16_t*)0x204a0d9c = 0;
    *(uint16_t*)0x204a0d9e = 0;
    *(uint16_t*)0x204a0da0 = 0;
    *(uint16_t*)0x204a0da2 = 0;
    *(uint16_t*)0x204a0da4 = 0;
    *(uint16_t*)0x204a0da6 = 0;
    *(uint16_t*)0x204a0da8 = 0;
    *(uint16_t*)0x204a0daa = 0;
    *(uint16_t*)0x204a0dac = 0;
    *(uint16_t*)0x204a0dae = 0;
    *(uint16_t*)0x204a0db0 = 0;
    *(uint16_t*)0x204a0db2 = 0;
    *(uint16_t*)0x204a0db4 = 0;
    *(uint32_t*)0x204a0db8 = 0;
    *(uint32_t*)0x204a0dbc = 0;
    *(uint64_t*)0x204a0dc0 = 0;
    *(uint32_t*)0x204a0dc8 = htobe32(-1);
    *(uint8_t*)0x204a0dcc = 0xac;
    *(uint8_t*)0x204a0dcd = 0x14;
    *(uint8_t*)0x204a0dce = 0;
    *(uint8_t*)0x204a0dcf = 0xaa;
    *(uint32_t*)0x204a0dd0 = htobe32(0);
    *(uint32_t*)0x204a0dd4 = htobe32(-1);
    *(uint8_t*)0x204a0dd8 = 0x73;
    *(uint8_t*)0x204a0dd9 = 0x79;
    *(uint8_t*)0x204a0dda = 0x7a;
    *(uint8_t*)0x204a0ddb = 0;
    *(uint8_t*)0x204a0ddc = 0;
    memcpy((void*)0x204a0de8,
           "\x86\x89\x40\x15\x87\xa1\x77\x56\x41\x8a\xe1\x5c\x38\xff\x0a\x4e",
           16);
    *(uint8_t*)0x204a0df8 = 0;
    *(uint8_t*)0x204a0df9 = 0;
    *(uint8_t*)0x204a0dfa = 0;
    *(uint8_t*)0x204a0dfb = 0;
    *(uint8_t*)0x204a0dfc = 0;
    *(uint8_t*)0x204a0dfd = 0;
    *(uint8_t*)0x204a0dfe = 0;
    *(uint8_t*)0x204a0dff = 0;
    *(uint8_t*)0x204a0e00 = 0;
    *(uint8_t*)0x204a0e01 = 0;
    *(uint8_t*)0x204a0e02 = 0;
    *(uint8_t*)0x204a0e03 = 0;
    *(uint8_t*)0x204a0e04 = 0;
    *(uint8_t*)0x204a0e05 = 0;
    *(uint8_t*)0x204a0e06 = 0;
    *(uint8_t*)0x204a0e07 = 0;
    *(uint8_t*)0x204a0e08 = 0;
    *(uint8_t*)0x204a0e09 = 0;
    *(uint8_t*)0x204a0e0a = 0;
    *(uint8_t*)0x204a0e0b = 0;
    *(uint8_t*)0x204a0e0c = 0;
    *(uint8_t*)0x204a0e0d = 0;
    *(uint8_t*)0x204a0e0e = 0;
    *(uint8_t*)0x204a0e0f = 0;
    *(uint8_t*)0x204a0e10 = 0;
    *(uint8_t*)0x204a0e11 = 0;
    *(uint8_t*)0x204a0e12 = 0;
    *(uint8_t*)0x204a0e13 = 0;
    *(uint8_t*)0x204a0e14 = 0;
    *(uint8_t*)0x204a0e15 = 0;
    *(uint8_t*)0x204a0e16 = 0;
    *(uint8_t*)0x204a0e17 = 0;
    *(uint16_t*)0x204a0e18 = 0;
    *(uint8_t*)0x204a0e1a = 0;
    *(uint8_t*)0x204a0e1b = 0;
    *(uint32_t*)0x204a0e1c = 0;
    *(uint16_t*)0x204a0e20 = 0x70;
    *(uint16_t*)0x204a0e22 = 0xd0;
    *(uint32_t*)0x204a0e24 = 0;
    *(uint64_t*)0x204a0e28 = 0;
    *(uint64_t*)0x204a0e30 = 0;
    *(uint16_t*)0x204a0e38 = 0x60;
    memcpy((void*)0x204a0e3a, "\x43\x4c\x55\x53\x54\x45\x52\x49\x50\x00\x00\x00"
                              "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
                              "\x00\x00\x00\x00\x00",
           29);
    *(uint8_t*)0x204a0e57 = 0;
    *(uint32_t*)0x204a0e58 = 0;
    *(uint8_t*)0x204a0e5c = 0xaa;
    *(uint8_t*)0x204a0e5d = 0xaa;
    *(uint8_t*)0x204a0e5e = 0xaa;
    *(uint8_t*)0x204a0e5f = 0xaa;
    *(uint8_t*)0x204a0e60 = 0;
    *(uint8_t*)0x204a0e61 = 0xaa;
    *(uint16_t*)0x204a0e62 = 0;
    *(uint16_t*)0x204a0e64 = 0;
    *(uint16_t*)0x204a0e66 = 0;
    *(uint16_t*)0x204a0e68 = 0;
    *(uint16_t*)0x204a0e6a = 0;
    *(uint16_t*)0x204a0e6c = 0;
    *(uint16_t*)0x204a0e6e = 0;
    *(uint16_t*)0x204a0e70 = 0;
    *(uint16_t*)0x204a0e72 = 0;
    *(uint16_t*)0x204a0e74 = 0;
    *(uint16_t*)0x204a0e76 = 0;
    *(uint16_t*)0x204a0e78 = 0;
    *(uint16_t*)0x204a0e7a = 0;
    *(uint16_t*)0x204a0e7c = 0;
    *(uint16_t*)0x204a0e7e = 0;
    *(uint16_t*)0x204a0e80 = 0;
    *(uint16_t*)0x204a0e82 = 0;
    *(uint16_t*)0x204a0e84 = 0;
    *(uint32_t*)0x204a0e88 = 0;
    *(uint32_t*)0x204a0e8c = 0;
    *(uint64_t*)0x204a0e90 = 0;
    *(uint32_t*)0x204a0e98 = htobe32(0);
    *(uint32_t*)0x204a0e9c = htobe32(0xe0000002);
    *(uint32_t*)0x204a0ea0 = htobe32(0);
    *(uint32_t*)0x204a0ea4 = htobe32(0);
    memcpy((void*)0x204a0ea8,
           "\xb4\x71\x8e\xe6\x03\x26\xeb\x3d\x2e\x40\xde\xd6\x1d\xb9\x8f\xd6",
           16);
    memcpy((void*)0x204a0eb8,
           "\x08\xde\x74\x16\x20\xf0\x50\xb4\xcc\xf5\xc6\x30\xc7\x40\x03\xaa",
           16);
    *(uint8_t*)0x204a0ec8 = 0;
    *(uint8_t*)0x204a0ec9 = 0;
    *(uint8_t*)0x204a0eca = 0;
    *(uint8_t*)0x204a0ecb = 0;
    *(uint8_t*)0x204a0ecc = 0;
    *(uint8_t*)0x204a0ecd = 0;
    *(uint8_t*)0x204a0ece = 0;
    *(uint8_t*)0x204a0ecf = 0;
    *(uint8_t*)0x204a0ed0 = 0;
    *(uint8_t*)0x204a0ed1 = 0;
    *(uint8_t*)0x204a0ed2 = 0;
    *(uint8_t*)0x204a0ed3 = 0;
    *(uint8_t*)0x204a0ed4 = 0;
    *(uint8_t*)0x204a0ed5 = 0;
    *(uint8_t*)0x204a0ed6 = 0;
    *(uint8_t*)0x204a0ed7 = 0;
    *(uint8_t*)0x204a0ed8 = 0;
    *(uint8_t*)0x204a0ed9 = 0;
    *(uint8_t*)0x204a0eda = 0;
    *(uint8_t*)0x204a0edb = 0;
    *(uint8_t*)0x204a0edc = 0;
    *(uint8_t*)0x204a0edd = 0;
    *(uint8_t*)0x204a0ede = 0;
    *(uint8_t*)0x204a0edf = 0;
    *(uint8_t*)0x204a0ee0 = 0;
    *(uint8_t*)0x204a0ee1 = 0;
    *(uint8_t*)0x204a0ee2 = 0;
    *(uint8_t*)0x204a0ee3 = 0;
    *(uint8_t*)0x204a0ee4 = 0;
    *(uint8_t*)0x204a0ee5 = 0;
    *(uint8_t*)0x204a0ee6 = 0;
    *(uint8_t*)0x204a0ee7 = 0;
    *(uint16_t*)0x204a0ee8 = 0;
    *(uint8_t*)0x204a0eea = 0;
    *(uint8_t*)0x204a0eeb = 0;
    *(uint32_t*)0x204a0eec = 0;
    *(uint16_t*)0x204a0ef0 = 0x70;
    *(uint16_t*)0x204a0ef2 = 0xd0;
    *(uint32_t*)0x204a0ef4 = 0;
    *(uint64_t*)0x204a0ef8 = 0;
    *(uint64_t*)0x204a0f00 = 0;
    *(uint16_t*)0x204a0f08 = 0x60;
    memcpy((void*)0x204a0f0a, "\x53\x45\x54\x00\x00\x00\x00\x00\x00\x00\x00\x00"
                              "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
                              "\x00\x00\x00\x00\x00",
           29);
    *(uint8_t*)0x204a0f27 = 0;
    *(uint16_t*)0x204a0f28 = 0;
    *(uint32_t*)0x204a0f2c = 0;
    *(uint32_t*)0x204a0f30 = 0;
    *(uint32_t*)0x204a0f34 = 0;
    *(uint32_t*)0x204a0f38 = 0;
    *(uint32_t*)0x204a0f3c = 0;
    *(uint32_t*)0x204a0f40 = 0;
    *(uint8_t*)0x204a0f44 = 0;
    *(uint8_t*)0x204a0f45 = 0;
    *(uint16_t*)0x204a0f46 = 0;
    *(uint16_t*)0x204a0f48 = 0;
    *(uint32_t*)0x204a0f4c = 0;
    *(uint32_t*)0x204a0f50 = 0;
    *(uint32_t*)0x204a0f54 = 0;
    *(uint32_t*)0x204a0f58 = 0;
    *(uint32_t*)0x204a0f5c = 0;
    *(uint32_t*)0x204a0f60 = 0;
    *(uint8_t*)0x204a0f64 = 0;
    *(uint8_t*)0x204a0f65 = 0;
    *(uint16_t*)0x204a0f66 = 0;
    *(uint8_t*)0x204a0f68 = 0;
    *(uint8_t*)0x204a0f69 = 0;
    *(uint8_t*)0x204a0f6a = 0;
    *(uint8_t*)0x204a0f6b = 0;
    *(uint8_t*)0x204a0f6c = 0;
    *(uint8_t*)0x204a0f6d = 0;
    *(uint8_t*)0x204a0f6e = 0;
    *(uint8_t*)0x204a0f6f = 0;
    *(uint8_t*)0x204a0f70 = 0;
    *(uint8_t*)0x204a0f71 = 0;
    *(uint8_t*)0x204a0f72 = 0;
    *(uint8_t*)0x204a0f73 = 0;
    *(uint8_t*)0x204a0f74 = 0;
    *(uint8_t*)0x204a0f75 = 0;
    *(uint8_t*)0x204a0f76 = 0;
    *(uint8_t*)0x204a0f77 = 0;
    *(uint8_t*)0x204a0f78 = 0;
    *(uint8_t*)0x204a0f79 = 0;
    *(uint8_t*)0x204a0f7a = 0;
    *(uint8_t*)0x204a0f7b = 0;
    *(uint8_t*)0x204a0f7c = 0;
    *(uint8_t*)0x204a0f7d = 0;
    *(uint8_t*)0x204a0f7e = 0;
    *(uint8_t*)0x204a0f7f = 0;
    *(uint8_t*)0x204a0f80 = 0;
    *(uint8_t*)0x204a0f81 = 0;
    *(uint8_t*)0x204a0f82 = 0;
    *(uint8_t*)0x204a0f83 = 0;
    *(uint8_t*)0x204a0f84 = 0;
    *(uint8_t*)0x204a0f85 = 0;
    *(uint8_t*)0x204a0f86 = 0;
    *(uint8_t*)0x204a0f87 = 0;
    *(uint8_t*)0x204a0f88 = 0;
    *(uint8_t*)0x204a0f89 = 0;
    *(uint8_t*)0x204a0f8a = 0;
    *(uint8_t*)0x204a0f8b = 0;
    *(uint8_t*)0x204a0f8c = 0;
    *(uint8_t*)0x204a0f8d = 0;
    *(uint8_t*)0x204a0f8e = 0;
    *(uint8_t*)0x204a0f8f = 0;
    *(uint8_t*)0x204a0f90 = 0;
    *(uint8_t*)0x204a0f91 = 0;
    *(uint8_t*)0x204a0f92 = 0;
    *(uint8_t*)0x204a0f93 = 0;
    *(uint8_t*)0x204a0f94 = 0;
    *(uint8_t*)0x204a0f95 = 0;
    *(uint8_t*)0x204a0f96 = 0;
    *(uint8_t*)0x204a0f97 = 0;
    *(uint8_t*)0x204a0f98 = 0;
    *(uint8_t*)0x204a0f99 = 0;
    *(uint8_t*)0x204a0f9a = 0;
    *(uint8_t*)0x204a0f9b = 0;
    *(uint8_t*)0x204a0f9c = 0;
    *(uint8_t*)0x204a0f9d = 0;
    *(uint8_t*)0x204a0f9e = 0;
    *(uint8_t*)0x204a0f9f = 0;
    *(uint8_t*)0x204a0fa0 = 0;
    *(uint8_t*)0x204a0fa1 = 0;
    *(uint8_t*)0x204a0fa2 = 0;
    *(uint8_t*)0x204a0fa3 = 0;
    *(uint8_t*)0x204a0fa4 = 0;
    *(uint8_t*)0x204a0fa5 = 0;
    *(uint8_t*)0x204a0fa6 = 0;
    *(uint8_t*)0x204a0fa7 = 0;
    *(uint8_t*)0x204a0fa8 = 0;
    *(uint8_t*)0x204a0fa9 = 0;
    *(uint8_t*)0x204a0faa = 0;
    *(uint8_t*)0x204a0fab = 0;
    *(uint8_t*)0x204a0fac = 0;
    *(uint8_t*)0x204a0fad = 0;
    *(uint8_t*)0x204a0fae = 0;
    *(uint8_t*)0x204a0faf = 0;
    *(uint8_t*)0x204a0fb0 = 0;
    *(uint8_t*)0x204a0fb1 = 0;
    *(uint8_t*)0x204a0fb2 = 0;
    *(uint8_t*)0x204a0fb3 = 0;
    *(uint8_t*)0x204a0fb4 = 0;
    *(uint8_t*)0x204a0fb5 = 0;
    *(uint8_t*)0x204a0fb6 = 0;
    *(uint8_t*)0x204a0fb7 = 0;
    *(uint8_t*)0x204a0fb8 = 0;
    *(uint8_t*)0x204a0fb9 = 0;
    *(uint8_t*)0x204a0fba = 0;
    *(uint8_t*)0x204a0fbb = 0;
    *(uint32_t*)0x204a0fbc = 0;
    *(uint16_t*)0x204a0fc0 = 0x70;
    *(uint16_t*)0x204a0fc2 = 0x98;
    *(uint32_t*)0x204a0fc4 = 0;
    *(uint64_t*)0x204a0fc8 = 0;
    *(uint64_t*)0x204a0fd0 = 0;
    *(uint16_t*)0x204a0fd8 = 0x28;
    memcpy((void*)0x204a0fda, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
                              "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
                              "\x00\x00\x00\x00\x00",
           29);
    *(uint8_t*)0x204a0ff7 = 0;
    *(uint32_t*)0x204a0ff8 = 0xfffffffe;
    syscall(__NR_setsockopt, r[0], 0, 0x40, 0x204a0c98, 0x368);
    break;
  case 3:
    *(uint8_t*)0x20791fd1 = 0xaa;
    *(uint8_t*)0x20791fd2 = 0xaa;
    *(uint8_t*)0x20791fd3 = 0xaa;
    *(uint8_t*)0x20791fd4 = 0xaa;
    *(uint8_t*)0x20791fd5 = 0 + procid * 1;
    *(uint8_t*)0x20791fd6 = 0xaa;
    *(uint8_t*)0x20791fd7 = 0xaa;
    *(uint8_t*)0x20791fd8 = 0xaa;
    *(uint8_t*)0x20791fd9 = 0xaa;
    *(uint8_t*)0x20791fda = 0xaa;
    *(uint8_t*)0x20791fdb = 0;
    *(uint8_t*)0x20791fdc = 0;
    *(uint16_t*)0x20791fdd = htobe16(0x800);
    STORE_BY_BITMASK(uint8_t, 0x20791fdf, 5, 0, 4);
    STORE_BY_BITMASK(uint8_t, 0x20791fdf, 4, 4, 4);
    STORE_BY_BITMASK(uint8_t, 0x20791fe0, 0, 0, 2);
    STORE_BY_BITMASK(uint8_t, 0x20791fe0, 0, 2, 6);
    *(uint16_t*)0x20791fe1 = htobe16(0x1c);
    *(uint16_t*)0x20791fe3 = 0;
    *(uint16_t*)0x20791fe5 = htobe16(0);
    *(uint8_t*)0x20791fe7 = 0;
    *(uint8_t*)0x20791fe8 = 2;
    *(uint16_t*)0x20791fe9 = 0;
    *(uint32_t*)0x20791feb = htobe32(0);
    *(uint32_t*)0x20791fef = htobe32(-1);
    *(uint8_t*)0x20791ff3 = 0x11;
    *(uint8_t*)0x20791ff4 = 0;
    *(uint16_t*)0x20791ff5 = 0;
    *(uint32_t*)0x20791ff7 = htobe32(0);
    *(uint32_t*)0x20ced000 = 0;
    *(uint32_t*)0x20ced004 = 1;
    *(uint32_t*)0x20ced008 = 0;
    struct csum_inet csum_1;
    csum_inet_init(&csum_1);
    csum_inet_update(&csum_1, (const uint8_t*)0x20791ff3, 8);
    *(uint16_t*)0x20791ff5 = csum_inet_digest(&csum_1);
    struct csum_inet csum_2;
    csum_inet_init(&csum_2);
    csum_inet_update(&csum_2, (const uint8_t*)0x20791fdf, 20);
    *(uint16_t*)0x20791fe9 = csum_inet_digest(&csum_2);
    syz_emit_ethernet(0x2a, 0x20791fd1, 0x20ced000);
    break;
  }
}

void test()
{
  memset(r, -1, sizeof(r));
  execute(4);
  collide = 1;
  execute(4);
}

int main()
{
  for (procid = 0; procid < 8; procid++) {
    if (fork() == 0) {
      for (;;) {
        setup_tun(procid, true);
        loop();
      }
    }
  }
  sleep(1000000);
  return 0;
}