// 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 <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/swap.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/falloc.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 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);
}

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[4096];
};

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

static struct nlmsg nlmsg;

const int kInitNetNsFd = 201;

#define DEVLINK_FAMILY_NAME "devlink"

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

static struct nlmsg nlmsg2;

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

static int runcmdline(char* cmdline)
{
	int ret = system(cmdline);
	if (ret) {
	}
	return ret;
}

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

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

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

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

error:
	close(sock);
}

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

}

#define MAX_FDS 30

static long syz_init_net_socket(volatile long domain, volatile long type, volatile long proto)
{
	int netns = open("/proc/self/ns/net", O_RDONLY);
	if (netns == -1)
		return netns;
	if (setns(kInitNetNsFd, 0))
		return -1;
	int sock = syscall(__NR_socket, domain, type, proto);
	int err = errno;
	if (setns(netns, 0)) {
	exit(1);
	}
	close(netns);
	errno = err;
	return sock;
}

#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_request {
	uint8_t type;
	uint8_t opcode;
} __attribute__((packed));

struct vhci_pkt {
	uint8_t type;
	union {
		struct {
			uint8_t opcode;
			uint16_t id;
		} __attribute__((packed)) vendor_pkt;
		struct hci_command_hdr command_hdr;
	};
} __attribute__((packed));

#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

#define HCI_PRIMARY 0
#define HCI_OP_RESET 0x0c03

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 = 202;
	if (dup2(vhci_fd, kVhciFd) < 0)
	exit(1);
	close(vhci_fd);
	vhci_fd = kVhciFd;
	struct vhci_vendor_pkt_request vendor_pkt_req = {HCI_VENDOR_PKT, HCI_PRIMARY};
	if (write(vhci_fd, &vendor_pkt_req, sizeof(vendor_pkt_req)) != sizeof(vendor_pkt_req))
	exit(1);
	struct vhci_pkt vhci_pkt;
	if (read(vhci_fd, &vhci_pkt, sizeof(vhci_pkt)) != sizeof(vhci_pkt))
	exit(1);
	if (vhci_pkt.type == HCI_COMMAND_PKT && vhci_pkt.command_hdr.opcode == HCI_OP_RESET) {
		char response[1] = {0};
		hci_send_event_cmd_complete(vhci_fd, HCI_OP_RESET, response, sizeof(response));
		if (read(vhci_fd, &vhci_pkt, sizeof(vhci_pkt)) != sizeof(vhci_pkt))
	exit(1);
	}
	if (vhci_pkt.type != HCI_VENDOR_PKT)
	exit(1);
	int dev_id = vhci_pkt.vendor_pkt.id;
	pthread_t th;
	if (pthread_create(&th, NULL, event_thread, NULL))
	exit(1);
	int ret = ioctl(hci_sock, HCIDEVUP, dev_id);
	if (ret) {
		if (errno == ERFKILL) {
			rfkill_unblock_all();
			ret = ioctl(hci_sock, HCIDEVUP, dev_id);
		}
		if (ret && errno != EALREADY)
	exit(1);
	}
	struct hci_dev_req dr = {0};
	dr.dev_id = dev_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;
	uint64_t entrytable[XT_TABLE_SIZE / sizeof(uint64_t)];
};

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;
	uint64_t entrytable[XT_TABLE_SIZE / sizeof(uint64_t)];
};

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;
	uint64_t entrytable[XT_TABLE_SIZE / sizeof(uint64_t)];
};

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;
	uint64_t entrytable[XT_TABLE_SIZE / sizeof(uint64_t)];
};

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

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

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

static void loop();

static void sandbox_common()
{
	prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
	if (getppid() == 1)
	exit(1);
	int netns = open("/proc/self/ns/net", O_RDONLY);
	if (netns == -1)
	exit(1);
	if (dup2(netns, kInitNetNsFd) < 0)
	exit(1);
	close(netns);
	struct rlimit rlim;
	rlim.rlim_cur = rlim.rlim_max = (200 << 20);
	setrlimit(RLIMIT_AS, &rlim);
	rlim.rlim_cur = rlim.rlim_max = 32 << 20;
	setrlimit(RLIMIT_MEMLOCK, &rlim);
	rlim.rlim_cur = rlim.rlim_max = 136 << 20;
	setrlimit(RLIMIT_FSIZE, &rlim);
	rlim.rlim_cur = rlim.rlim_max = 1 << 20;
	setrlimit(RLIMIT_STACK, &rlim);
	rlim.rlim_cur = rlim.rlim_max = 128 << 20;
	setrlimit(RLIMIT_CORE, &rlim);
	rlim.rlim_cur = rlim.rlim_max = 256;
	setrlimit(RLIMIT_NOFILE, &rlim);
	if (unshare(CLONE_NEWNS)) {
	}
	if (mount(NULL, "/", NULL, MS_REC | MS_PRIVATE, NULL)) {
	}
	if (unshare(CLONE_NEWIPC)) {
	}
	if (unshare(0x02000000)) {
	}
	if (unshare(CLONE_NEWUTS)) {
	}
	if (unshare(CLONE_SYSVSEM)) {
	}
	typedef struct {
		const char* name;
		const char* value;
	} sysctl_t;
	static const sysctl_t sysctls[] = {
	    {"/proc/sys/kernel/shmmax", "16777216"},
	    {"/proc/sys/kernel/shmall", "536870912"},
	    {"/proc/sys/kernel/shmmni", "1024"},
	    {"/proc/sys/kernel/msgmax", "8192"},
	    {"/proc/sys/kernel/msgmni", "1024"},
	    {"/proc/sys/kernel/msgmnb", "1024"},
	    {"/proc/sys/kernel/sem", "1024 1048576 500 1024"},
	};
	unsigned i;
	for (i = 0; i < sizeof(sysctls) / sizeof(sysctls[0]); i++)
		write_file(sysctls[i].name, sysctls[i].value);
}

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

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

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

#define FS_IOC_SETFLAGS _IOW('f', 2, long)
static void remove_dir(const char* dir)
{
	int iter = 0;
	DIR* dp = 0;
	const int umount_flags = MNT_FORCE | UMOUNT_NOFOLLOW;

retry:
		while (umount2(dir, umount_flags) == 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, umount_flags) == 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, umount_flags))
	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, umount_flags))
	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()
{
	checkpoint_net_namespace();
}

static void reset_loop()
{
	reset_net_namespace();
}

static void setup_test()
{
	prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
	setpgrp();
	write_file("/proc/self/oom_score_adj", "1000");
	if (symlink("/dev/binderfs", "./binderfs")) {
	}
}

static void close_fds()
{
	for (int fd = 3; fd < MAX_FDS; fd++)
		close(fd);
}

static const char* setup_usb()
{
	if (chmod("/dev/raw-gadget", 0666))
		return "failed to chmod /dev/raw-gadget";
	return NULL;
}

#define SWAP_FILE "./swap-file"
#define SWAP_FILE_SIZE (128 * 1000 * 1000)

static const char* setup_swap()
{
	swapoff(SWAP_FILE);
	unlink(SWAP_FILE);
	int fd = open(SWAP_FILE, O_CREAT | O_WRONLY | O_CLOEXEC, 0600);
	if (fd == -1)
		return "swap file open failed";
	fallocate(fd, FALLOC_FL_ZERO_RANGE, 0, SWAP_FILE_SIZE);
	close(fd);
	char cmdline[64];
	sprintf(cmdline, "mkswap %s", SWAP_FILE);
	if (runcmdline(cmdline))
		return "mkswap failed";
	if (swapon(SWAP_FILE, SWAP_FLAG_PREFER) == 1)
		return "swapon failed";
	return NULL;
}

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)
{
	if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
	}
	int i, call, thread;
	for (call = 0; call < 2; 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);
			event_timedwait(&th->done, 50);
			break;
		}
	}
	for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++)
		sleep_ms(1);
	close_fds();
}

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 (;;) {
			sleep_ms(10);
			if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid)
				break;
			if (current_time_ms() - start < 5000)
				continue;
			kill_and_wait(pid, &status);
			break;
		}
		remove_dir(cwdbuf);
	}
}

uint64_t r[1] = {0xffffffffffffffff};

void execute_call(int call)
{
		intptr_t res = 0;
	switch (call) {
	case 0:
		res = -1;
res = syz_init_net_socket(/*fam=*/0x1f, /*type=*/5, /*proto=*/2);
		if (res != -1)
				r[0] = res;
		break;
	case 1:
*(uint16_t*)0x20000000 = 0x1f;
memset((void*)0x20000002, 255, 6);
		syscall(__NR_connect, /*fd=*/r[0], /*addr=*/0x20000000ul, /*addrlen=*/8ul);
		break;
	}

}
int main(void)
{
		syscall(__NR_mmap, /*addr=*/0x1ffff000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/0x32ul, /*fd=*/-1, /*offset=*/0ul);
	syscall(__NR_mmap, /*addr=*/0x20000000ul, /*len=*/0x1000000ul, /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/7ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/0x32ul, /*fd=*/-1, /*offset=*/0ul);
	syscall(__NR_mmap, /*addr=*/0x21000000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/0x32ul, /*fd=*/-1, /*offset=*/0ul);
	const char* reason;
	(void)reason;
	if ((reason = setup_usb()))
		printf("the reproducer may not work as expected: USB injection setup failed: %s\n", reason);
	if ((reason = setup_swap()))
		printf("the reproducer may not work as expected: swap setup failed: %s\n", reason);
	for (procid = 0; procid < 24; procid++) {
		if (fork() == 0) {
			use_temporary_dir();
			do_sandbox_none();
		}
	}
	sleep(1000000);
	return 0;
}