#define _GNU_SOURCE

#include <arpa/inet.h>
#include <dirent.h>
#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <ifaddrs.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/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/ethtool.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/nl80211.h>
#include <linux/rfkill.h>
#include <linux/rtnetlink.h>
#include <linux/sockios.h>
#include <linux/tcp.h>
#include <linux/veth.h>

static unsigned long long procid;

static __thread int clone_ongoing;
static __thread int skip_segv;
static __thread jmp_buf segv_env;

static void segv_handler(int sig, siginfo_t* info, void* ctx)
{
        if (__atomic_load_n(&clone_ongoing, __ATOMIC_RELAXED) != 0) {
                exit(sig);
        }
        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(...) ({ int ok = 1; __atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST); if (_setjmp(segv_env) == 0) { __VA_ARGS__; } else ok = 0; __atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST); ok; })

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;
}

struct vf_intf {
        char pass_thru_intf[IFNAMSIZ];
        int ppid;
};

static struct vf_intf vf_intf;

static void find_vf_interface(void)
{
        struct ifaddrs* addresses = NULL;
        int pid = getpid();
        int ret = 0;
        memset(&vf_intf, 0, sizeof(struct vf_intf));
        if (getifaddrs(&addresses) == -1) {
                return;
        }
        int fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
        if (fd < 0) {
                return;
        }
        struct ifreq ifr;
        struct ethtool_drvinfo drvinfo;
        struct ifaddrs* address = addresses;
        while (address) {
                memset(&ifr, 0, sizeof(struct ifreq));
                strcpy(ifr.ifr_name, address->ifa_name);
                memset(&drvinfo, 0, sizeof(struct ethtool_drvinfo));
                drvinfo.cmd = ETHTOOL_GDRVINFO;
                ifr.ifr_data = (caddr_t)&drvinfo;
                ret = ioctl(fd, SIOCETHTOOL, &ifr);
                if (ret < 0) {
                } else if (strlen(drvinfo.bus_info)) {
                        if (strcmp(drvinfo.bus_info, "0000:00:11.0") == 0) {
                                if (strlen(address->ifa_name) < IFNAMSIZ) {
                                        strncpy(vf_intf.pass_thru_intf,
                                                address->ifa_name, IFNAMSIZ);
                                        vf_intf.ppid = pid;
                                } else {
                                }
                                break;
                        }
                }
                address = address->ifa_next;
        }
        freeifaddrs(addresses);
        if (!vf_intf.ppid) {
                memset(&vf_intf, 0, sizeof(struct vf_intf));
                return;
        }
}

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

static struct nlmsg nlmsg;

static int tunfd = -1;

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

#define IFF_NAPI 0x0010

static void 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 = 200;
        if (dup2(tunfd, kTunFd) < 0)
        exit(1);
        close(tunfd);
        tunfd = kTunFd;
        struct ifreq ifr;
        memset(&ifr, 0, sizeof(ifr));
        strncpy(ifr.ifr_name, TUN_IFACE, IFNAMSIZ);
        ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
        if (ioctl(tunfd, TUNSETIFF, (void*)&ifr) < 0) {
        exit(1);
        }
        char sysctl[64];
        sprintf(sysctl, "/proc/sys/net/ipv6/conf/%s/accept_dad", TUN_IFACE);
        write_file(sysctl, "0");
        sprintf(sysctl, "/proc/sys/net/ipv6/conf/%s/router_solicitations", TUN_IFACE);
        write_file(sysctl, "0");
        int sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
        if (sock == -1)
        exit(1);
        netlink_add_addr4(&nlmsg, sock, TUN_IFACE, LOCAL_IPV4);
        netlink_add_addr6(&nlmsg, sock, TUN_IFACE, LOCAL_IPV6);
        uint64_t macaddr = REMOTE_MAC;
        struct in_addr in_addr;
        inet_pton(AF_INET, REMOTE_IPV4, &in_addr);
        netlink_add_neigh(&nlmsg, sock, TUN_IFACE, &in_addr, sizeof(in_addr), &macaddr, ETH_ALEN);
        struct in6_addr in6_addr;
        inet_pton(AF_INET6, REMOTE_IPV6, &in6_addr);
        netlink_add_neigh(&nlmsg, sock, TUN_IFACE, &in6_addr, sizeof(in6_addr), &macaddr, ETH_ALEN);
        macaddr = LOCAL_MAC;
        netlink_device_change(&nlmsg, sock, TUN_IFACE, true, 0, &macaddr, ETH_ALEN, NULL);
        close(sock);
}

const int kInitNetNsFd = 201;

#define DEVLINK_FAMILY_NAME "devlink"

#define DEVLINK_CMD_PORT_GET 5
#define DEVLINK_CMD_RELOAD 37
#define DEVLINK_ATTR_BUS_NAME 1
#define DEVLINK_ATTR_DEV_NAME 2
#define DEVLINK_ATTR_NETDEV_NAME 7
#define DEVLINK_ATTR_NETNS_FD 138

static void netlink_devlink_netns_move(const char* bus_name, const char* dev_name, int netns_fd)
{
        struct genlmsghdr genlhdr;
        int sock;
        int id, err;
        sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC);
        if (sock == -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_RELOAD;
        netlink_init(&nlmsg, id, 0, &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);
        netlink_attr(&nlmsg, DEVLINK_ATTR_NETNS_FD, &netns_fd, sizeof(netns_fd));
        err = netlink_send(&nlmsg, sock);
        if (err < 0) {
        }
error:
        close(sock);
}

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 void initialize_devlink_pci(void)
{
        int netns = open("/proc/self/ns/net", O_RDONLY);
        if (netns == -1)
        exit(1);
        int ret = setns(kInitNetNsFd, 0);
        if (ret == -1)
        exit(1);
        netlink_devlink_netns_move("pci", "0000:00:10.0", netns);
        ret = setns(netns, 0);
        if (ret == -1)
        exit(1);
        close(netns);
        initialize_devlink_ports("pci", "0000:00:10.0", "netpci");
}

#define WIFI_INITIAL_DEVICE_COUNT 2
#define WIFI_MAC_BASE { 0x08, 0x02, 0x11, 0x00, 0x00, 0x00 }
#define WIFI_IBSS_BSSID { 0x50, 0x50, 0x50, 0x50, 0x50, 0x50 }
#define WIFI_IBSS_SSID { 0x10, 0x10, 0x10, 0x10, 0x10, 0x10 }
#define WIFI_DEFAULT_FREQUENCY 2412
#define WIFI_DEFAULT_SIGNAL 0
#define WIFI_DEFAULT_RX_RATE 1
#define HWSIM_CMD_REGISTER 1
#define HWSIM_CMD_FRAME 2
#define HWSIM_CMD_NEW_RADIO 4
#define HWSIM_ATTR_SUPPORT_P2P_DEVICE 14
#define HWSIM_ATTR_PERM_ADDR 22

#define IF_OPER_UP 6
struct join_ibss_props {
        int wiphy_freq;
        bool wiphy_freq_fixed;
        uint8_t* mac;
        uint8_t* ssid;
        int ssid_len;
};

static int set_interface_state(const char* interface_name, int on)
{
        struct ifreq ifr;
        int sock = socket(AF_INET, SOCK_DGRAM, 0);
        if (sock < 0) {
                return -1;
        }
        memset(&ifr, 0, sizeof(ifr));
        strcpy(ifr.ifr_name, interface_name);
        int ret = ioctl(sock, SIOCGIFFLAGS, &ifr);
        if (ret < 0) {
                close(sock);
                return -1;
        }
        if (on)
                ifr.ifr_flags |= IFF_UP;
        else
                ifr.ifr_flags &= ~IFF_UP;
        ret = ioctl(sock, SIOCSIFFLAGS, &ifr);
        close(sock);
        if (ret < 0) {
                return -1;
        }
        return 0;
}

static int nl80211_set_interface(struct nlmsg* nlmsg, int sock, int nl80211_family, uint32_t ifindex, uint32_t iftype)
{
        struct genlmsghdr genlhdr;
        memset(&genlhdr, 0, sizeof(genlhdr));
        genlhdr.cmd = NL80211_CMD_SET_INTERFACE;
        netlink_init(nlmsg, nl80211_family, 0, &genlhdr, sizeof(genlhdr));
        netlink_attr(nlmsg, NL80211_ATTR_IFINDEX, &ifindex, sizeof(ifindex));
        netlink_attr(nlmsg, NL80211_ATTR_IFTYPE, &iftype, sizeof(iftype));
        int err = netlink_send(nlmsg, sock);
        if (err < 0) {
        }
        return err;
}

static int nl80211_join_ibss(struct nlmsg* nlmsg, int sock, int nl80211_family, uint32_t ifindex, struct join_ibss_props* props)
{
        struct genlmsghdr genlhdr;
        memset(&genlhdr, 0, sizeof(genlhdr));
        genlhdr.cmd = NL80211_CMD_JOIN_IBSS;
        netlink_init(nlmsg, nl80211_family, 0, &genlhdr, sizeof(genlhdr));
        netlink_attr(nlmsg, NL80211_ATTR_IFINDEX, &ifindex, sizeof(ifindex));
        netlink_attr(nlmsg, NL80211_ATTR_SSID, props->ssid, props->ssid_len);
        netlink_attr(nlmsg, NL80211_ATTR_WIPHY_FREQ, &(props->wiphy_freq), sizeof(props->wiphy_freq));
        if (props->mac)
                netlink_attr(nlmsg, NL80211_ATTR_MAC, props->mac, ETH_ALEN);
        if (props->wiphy_freq_fixed)
                netlink_attr(nlmsg, NL80211_ATTR_FREQ_FIXED, NULL, 0);
        int err = netlink_send(nlmsg, sock);
        if (err < 0) {
        }
        return err;
}

static int get_ifla_operstate(struct nlmsg* nlmsg, int ifindex)
{
        struct ifinfomsg info;
        memset(&info, 0, sizeof(info));
        info.ifi_family = AF_UNSPEC;
        info.ifi_index = ifindex;
        int sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
        if (sock == -1) {
                return -1;
        }
        netlink_init(nlmsg, RTM_GETLINK, 0, &info, sizeof(info));
        int n;
        int err = netlink_send_ext(nlmsg, sock, RTM_NEWLINK, &n, true);
        close(sock);
        if (err) {
                return -1;
        }
        struct rtattr* attr = IFLA_RTA(NLMSG_DATA(nlmsg->buf));
        for (; RTA_OK(attr, n); attr = RTA_NEXT(attr, n)) {
                if (attr->rta_type == IFLA_OPERSTATE)
                        return *((int32_t*)RTA_DATA(attr));
        }
        return -1;
}

static int await_ifla_operstate(struct nlmsg* nlmsg, char* interface, int operstate)
{
        int ifindex = if_nametoindex(interface);
        while (true) {
                usleep(1000);
                int ret = get_ifla_operstate(nlmsg, ifindex);
                if (ret < 0)
                        return ret;
                if (ret == operstate)
                        return 0;
        }
        return 0;
}

static int nl80211_setup_ibss_interface(struct nlmsg* nlmsg, int sock, int nl80211_family_id, char* interface, struct join_ibss_props* ibss_props)
{
        int ifindex = if_nametoindex(interface);
        if (ifindex == 0) {
                return -1;
        }
        int ret = nl80211_set_interface(nlmsg, sock, nl80211_family_id, ifindex, NL80211_IFTYPE_ADHOC);
        if (ret < 0) {
                return -1;
        }
        ret = set_interface_state(interface, 1);
        if (ret < 0) {
                return -1;
        }
        ret = nl80211_join_ibss(nlmsg, sock, nl80211_family_id, ifindex, ibss_props);
        if (ret < 0) {
                return -1;
        }
        return 0;
}

static int hwsim80211_create_device(struct nlmsg* nlmsg, int sock, int hwsim_family, uint8_t mac_addr[ETH_ALEN])
{
        struct genlmsghdr genlhdr;
        memset(&genlhdr, 0, sizeof(genlhdr));
        genlhdr.cmd = HWSIM_CMD_NEW_RADIO;
        netlink_init(nlmsg, hwsim_family, 0, &genlhdr, sizeof(genlhdr));
        netlink_attr(nlmsg, HWSIM_ATTR_SUPPORT_P2P_DEVICE, NULL, 0);
        netlink_attr(nlmsg, HWSIM_ATTR_PERM_ADDR, mac_addr, ETH_ALEN);
        int err = netlink_send(nlmsg, sock);
        if (err < 0) {
        }
        return err;
}

static void initialize_wifi_devices(void)
{
        int rfkill = open("/dev/rfkill", O_RDWR);
        if (rfkill == -1) {
                if (errno != ENOENT && errno != EACCES)
        exit(1);
        } else {
                struct rfkill_event event = {0};
                event.type = RFKILL_TYPE_ALL;
                event.op = RFKILL_OP_CHANGE_ALL;
                if (write(rfkill, &event, sizeof(event)) != (ssize_t)(sizeof(event)))
        exit(1);
                close(rfkill);
        }
        uint8_t mac_addr[6] = WIFI_MAC_BASE;
        int sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC);
        if (sock < 0) {
                return;
        }
        int hwsim_family_id = netlink_query_family_id(&nlmsg, sock, "MAC80211_HWSIM", true);
        int nl80211_family_id = netlink_query_family_id(&nlmsg, sock, "nl80211", true);
        uint8_t ssid[] = WIFI_IBSS_SSID;
        uint8_t bssid[] = WIFI_IBSS_BSSID;
        struct join_ibss_props ibss_props = {
            .wiphy_freq = WIFI_DEFAULT_FREQUENCY, .wiphy_freq_fixed = true, .mac = bssid, .ssid = ssid, .ssid_len = sizeof(ssid)};
        for (int device_id = 0; device_id < WIFI_INITIAL_DEVICE_COUNT; device_id++) {
                mac_addr[5] = device_id;
                int ret = hwsim80211_create_device(&nlmsg, sock, hwsim_family_id, mac_addr);
                if (ret < 0)
        exit(1);
                char interface[6] = "wlan0";
                interface[4] += device_id;
                if (nl80211_setup_ibss_interface(&nlmsg, sock, nl80211_family_id, interface, &ibss_props) < 0)
        exit(1);
        }
        for (int device_id = 0; device_id < WIFI_INITIAL_DEVICE_COUNT; device_id++) {
                char interface[6] = "wlan0";
                interface[4] += device_id;
                int ret = await_ifla_operstate(&nlmsg, interface, IF_OPER_UP);
                if (ret < 0)
        exit(1);
        }
        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 netlink_nicvf_setup(void)
{
        char cmdline[256];
        if (!vf_intf.ppid)
                return;
        sprintf(cmdline, "nsenter -t 1 -n ip link set %s netns %d",
                vf_intf.pass_thru_intf, getpid());
        if (runcmdline(cmdline))
                return;
        sprintf(cmdline, "ip a s %s", vf_intf.pass_thru_intf);
        if (runcmdline(cmdline))
                return;
        sprintf(cmdline, "ip link set %s down", vf_intf.pass_thru_intf);
        if (runcmdline(cmdline))
                return;
        sprintf(cmdline, "ip link set %s name nicvf0", vf_intf.pass_thru_intf);
        if (runcmdline(cmdline))
                return;

}
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"},
                {"nicvf", "nicvf0"},
                {"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},
                {"nicvf0", 0, true},
                {"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();
        netlink_nicvf_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);
        find_vf_interface();
}

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

static long syz_open_dev(volatile long a0, volatile long a1, volatile long a2)
{
        if (a0 == 0xc || a0 == 0xb) {
                char buf[128];
                sprintf(buf, "/dev/%s/%d:%d", a0 == 0xc ? "char" : "block", (uint8_t)a1, (uint8_t)a2);
                return open(buf, O_RDWR, 0);
        } else {
                char buf[1024];
                char* hash;
                strncpy(buf, (char*)a0, sizeof(buf) - 1);
                buf[sizeof(buf) - 1] = 0;
                while ((hash = strchr(buf, '#'))) {
                        *hash = '0' + (char)(a1 % 10);
                        a1 /= 10;
                }
                return open(buf, a2, 0);
        }
}

#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:
                        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 mount_cgroups(const char* dir, const char** controllers, int count)
{
        if (mkdir(dir, 0777)) {
                return;
        }
        char enabled[128] = {0};
        int i = 0;
        for (; i < count; i++) {
                if (mount("none", dir, "cgroup", 0, controllers[i])) {
                        continue;
                }
                umount(dir);
                strcat(enabled, ",");
                strcat(enabled, controllers[i]);
        }
        if (enabled[0] == 0) {
                if (rmdir(dir) && errno != EBUSY)
        exit(1);
                return;
        }
        if (mount("none", dir, "cgroup", 0, enabled + 1)) {
                if (rmdir(dir) && errno != EBUSY)
        exit(1);
        }
        if (chmod(dir, 0777)) {
        }
}

static void mount_cgroups2(const char** controllers, int count)
{
        if (mkdir("/syzcgroup/unified", 0777)) {
                return;
        }
        if (mount("none", "/syzcgroup/unified", "cgroup2", 0, NULL)) {
                if (rmdir("/syzcgroup/unified") && errno != EBUSY)
        exit(1);
                return;
        }
        if (chmod("/syzcgroup/unified", 0777)) {
        }
        int control = open("/syzcgroup/unified/cgroup.subtree_control", O_WRONLY);
        if (control == -1)
                return;
        int i;
        for (i = 0; i < count; i++)
                if (write(control, controllers[i], strlen(controllers[i])) < 0) {
                }
        close(control);
}

static void setup_cgroups()
{
        const char* unified_controllers[] = {"+cpu", "+io", "+pids"};
        const char* net_controllers[] = {"net", "net_prio", "devices", "blkio", "freezer"};
        const char* cpu_controllers[] = {"cpuset", "cpuacct", "hugetlb", "rlimit", "memory"};
        if (mkdir("/syzcgroup", 0777)) {
                return;
        }
        mount_cgroups2(unified_controllers, sizeof(unified_controllers) / sizeof(unified_controllers[0]));
        mount_cgroups("/syzcgroup/net", net_controllers, sizeof(net_controllers) / sizeof(net_controllers[0]));
        mount_cgroups("/syzcgroup/cpu", cpu_controllers, sizeof(cpu_controllers) / sizeof(cpu_controllers[0]));
        write_file("/syzcgroup/cpu/cgroup.clone_children", "1");
        write_file("/syzcgroup/cpu/cpuset.memory_pressure_enabled", "1");
}

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/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(file, sizeof(file), "%s/memory.soft_limit_in_bytes", cgroupdir);
        write_file(file, "%d", 299 << 20);
        snprintf(file, sizeof(file), "%s/memory.limit_in_bytes", cgroupdir);
        write_file(file, "%d", 300 << 20);
        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)) {
        }
}

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);
        setsid();
        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);
        setup_common();
        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_devlink_pci();
        initialize_tun();
        initialize_netdevices();
        initialize_wifi_devices();
        setup_binderfs();
        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 | UMOUNT_NOFOLLOW) == 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 | UMOUNT_NOFOLLOW) == 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 | UMOUNT_NOFOLLOW))
        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 | UMOUNT_NOFOLLOW))
        exit(1);
                                continue;
                        }
                        if (errno == ENOTEMPTY) {
                                if (iter < 100) {
                                        iter++;
                                        goto retry;
                                }
                        }
                }
        exit(1);
        }
}

static int inject_fault(int nth)
{
        int fd;
        fd = open("/proc/thread-self/fail-nth", O_RDWR);
        if (fd == -1)
        exit(1);
        char buf[16];
        sprintf(buf, "%d", nth);
        if (write(fd, buf, strlen(buf)) != (ssize_t)strlen(buf))
        exit(1);
        return fd;
}

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();
        if (symlink("/dev/binderfs", "./binderfs")) {
        }
}

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

static void setup_fault()
{
        static struct {
                const char* file;
                const char* val;
                bool fatal;
        } files[] = {
            {"/sys/kernel/debug/failslab/ignore-gfp-wait", "N", true},
            {"/sys/kernel/debug/fail_futex/ignore-private", "N", false},
            {"/sys/kernel/debug/fail_page_alloc/ignore-gfp-highmem", "N", false},
            {"/sys/kernel/debug/fail_page_alloc/ignore-gfp-wait", "N", false},
            {"/sys/kernel/debug/fail_page_alloc/min-order", "0", false},
        };
        unsigned i;
        for (i = 0; i < sizeof(files) / sizeof(files[0]); i++) {
                if (!write_file(files[i].file, files[i].val)) {
                        if (files[i].fatal)
        exit(1);
                }
        }
}

#define KMEMLEAK_FILE "/sys/kernel/debug/kmemleak"

static void setup_leak()
{
        if (!write_file(KMEMLEAK_FILE, "scan"))
        exit(1);
        sleep(5);
        if (!write_file(KMEMLEAK_FILE, "scan"))
        exit(1);
        if (!write_file(KMEMLEAK_FILE, "clear"))
        exit(1);
}

static void check_leaks(void)
{
        int fd = open(KMEMLEAK_FILE, O_RDWR);
        if (fd == -1)
        exit(1);
        uint64_t start = current_time_ms();
        if (write(fd, "scan", 4) != 4)
        exit(1);
        sleep(1);
        while (current_time_ms() - start < 4 * 1000)
                sleep(1);
        if (write(fd, "scan", 4) != 4)
        exit(1);
        static char buf[128 << 10];
        ssize_t n = read(fd, buf, sizeof(buf) - 1);
        if (n < 0)
        exit(1);
        int nleaks = 0;
        if (n != 0) {
                sleep(1);
                if (write(fd, "scan", 4) != 4)
        exit(1);
                if (lseek(fd, 0, SEEK_SET) < 0)
        exit(1);
                n = read(fd, buf, sizeof(buf) - 1);
                if (n < 0)
        exit(1);
                buf[n] = 0;
                char* pos = buf;
                char* end = buf + n;
                while (pos < end) {
                        char* next = strstr(pos + 1, "unreferenced object");
                        if (!next)
                                next = end;
                        char prev = *next;
                        *next = 0;
                        fprintf(stderr, "BUG: memory leak\n%s\n", pos);
                        *next = prev;
                        pos = next;
                        nleaks++;
                }
        }
        if (write(fd, "clear", 5) != 5)
        exit(1);
        close(fd);
        if (nleaks)
                exit(1);
}

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");
}

static void setup_usb()
{
        if (chmod("/dev/raw-gadget", 0666))
        exit(1);
}

static void setup_sysctl()
{
        char mypid[32];
        snprintf(mypid, sizeof(mypid), "%d", getpid());
        struct {
                const char* name;
                const char* data;
        } files[] = {
                {"/sys/kernel/debug/x86/nmi_longest_ns", "10000000000"},
                {"/proc/sys/kernel/hung_task_check_interval_secs", "20"},
                {"/proc/sys/net/core/bpf_jit_kallsyms", "1"},
                {"/proc/sys/net/core/bpf_jit_harden", "0"},
                {"/proc/sys/kernel/kptr_restrict", "0"},
                {"/proc/sys/kernel/softlockup_all_cpu_backtrace", "1"},
                {"/proc/sys/fs/mount-max", "100"},
                {"/proc/sys/vm/oom_dump_tasks", "0"},
                {"/proc/sys/debug/exception-trace", "0"},
                {"/proc/sys/kernel/printk", "7 4 1 3"},
                {"/proc/sys/kernel/keys/gc_delay", "1"},
                {"/proc/sys/vm/oom_kill_allocating_task", "1"},
                {"/proc/sys/kernel/ctrl-alt-del", "0"},
                {"/proc/sys/kernel/cad_pid", mypid},
        };
        for (size_t i = 0; i < sizeof(files) / sizeof(files[0]); i++) {
                if (!write_file(files[i].name, files[i].data))
                        printf("write to %s failed: %s\n", files[i].name, strerror(errno));
        }
}

#define NL802154_CMD_SET_SHORT_ADDR 11
#define NL802154_ATTR_IFINDEX 3
#define NL802154_ATTR_SHORT_ADDR 10

static void setup_802154()
{
        int sock_route = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
        if (sock_route == -1)
        exit(1);
        int sock_generic = socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC);
        if (sock_generic < 0)
        exit(1);
        int nl802154_family_id = netlink_query_family_id(&nlmsg, sock_generic, "nl802154", true);
        for (int i = 0; i < 2; i++) {
                char devname[] = "wpan0";
                devname[strlen(devname) - 1] += i;
                uint64_t hwaddr = 0xaaaaaaaaaaaa0002 + (i << 8);
                uint16_t shortaddr = 0xaaa0 + i;
                int ifindex = if_nametoindex(devname);
                struct genlmsghdr genlhdr;
                memset(&genlhdr, 0, sizeof(genlhdr));
                genlhdr.cmd = NL802154_CMD_SET_SHORT_ADDR;
                netlink_init(&nlmsg, nl802154_family_id, 0, &genlhdr, sizeof(genlhdr));
                netlink_attr(&nlmsg, NL802154_ATTR_IFINDEX, &ifindex, sizeof(ifindex));
                netlink_attr(&nlmsg, NL802154_ATTR_SHORT_ADDR, &shortaddr, sizeof(shortaddr));
                int err = netlink_send(&nlmsg, sock_generic);
                if (err < 0) {
                }
                netlink_device_change(&nlmsg, sock_route, devname, true, 0, &hwaddr, sizeof(hwaddr), 0);
                if (i == 0) {
                        netlink_add_device_impl(&nlmsg, "lowpan", "lowpan0", false);
                        netlink_done(&nlmsg);
                        netlink_attr(&nlmsg, IFLA_LINK, &ifindex, sizeof(ifindex));
                        int err = netlink_send(&nlmsg, sock_route);
                        if (err < 0) {
                        }
                }
        }
        close(sock_route);
        close(sock_generic);
}

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

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

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

void execute_call(int call)
{
                switch (call) {
        case 0:
                NONFAILING(memcpy((void*)0x20000040, "/dev/ptp#\000", 10));
                inject_fault(14);
                NONFAILING(syz_open_dev(/*dev=*/0x20000040, /*id=*/0 + procid*1, /*flags=*/0x40002));
                break;
        }

}
int main(void)
{
                syscall(__NR_mmap, /*addr=*/0x1ffff000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul);
        syscall(__NR_mmap, /*addr=*/0x20000000ul, /*len=*/0x1000000ul, /*prot=*/7ul, /*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul);
        syscall(__NR_mmap, /*addr=*/0x21000000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul);
        setup_sysctl();
        setup_cgroups();
        setup_binfmt_misc();
        setup_leak();
        setup_fault();
        setup_usb();
        setup_802154();
        setup_swap();
        install_segv_handler();
        for (procid = 0; procid < 8; procid++) {
                if (fork() == 0) {
                        use_temporary_dir();
                        do_sandbox_none();
                }
        }
        sleep(1000000);
        return 0;
}