# SPDX-License-Identifier: GPL-2.0 import ipaddressimport osimport sysimport timeimport jsonfrom pathlib import Pathfrom lib.py import KsftSkipEx, KsftXfailExfrom lib.py import ksft_pr, ksft_setup, wait_filefrom lib.py import cmd, ethtool, ip, CmdExitFailurefrom lib.py import NetNS, NetdevSimDev, UserNetNSfrom .remote import Remotefrom . import bpftool, RtnlFamily, Netlink  class NetDrvEnvBase:    """    Base class for a NIC / host environments     Attributes:      test_dir: Path to the source directory of the test      net_lib_dir: Path to the net/lib directory    """    def __init__(self, src_path):        self.src_path = Path(src_path)        self.test_dir = self.src_path.parent.resolve()        self.net_lib_dir = (Path(__file__).parent / "../../../../net/lib").resolve()         self.env = self._load_env_file()         # Following attrs must be set be inheriting classes        self.dev = None        self.ifname = None     def _load_env_file(self):        env = os.environ.copy()         src_dir = Path(self.src_path).parent.resolve()        if not (src_dir / "net.config").exists():            return ksft_setup(env)         with open((src_dir / "net.config").as_posix(), 'r') as fp:            for line in fp.readlines():                full_file = line                # Strip comments                pos = line.find("#")                if pos >= 0:                    line = line[:pos]                line = line.strip()                if not line:                    continue                pair = line.split('=', maxsplit=1)                if len(pair) != 2:                    raise Exception("Can't parse configuration line:", full_file)                env[pair[0]] = pair[1]        return ksft_setup(env)     def __del__(self):        pass     def _print_dev_info(self):        """        Show whether the test ran on real hardware or netdevsim.        Useful to confirm when results are shared on the mailing list.        """        driver = "unknown"        try:            info = ethtool(f"-i {self.ifname}").stdout            for line in info.splitlines():                if line.startswith("driver:"):                    driver = line.split(':', 1)[1].strip() or driver                    break        except (CmdExitFailure, FileNotFoundError):            pass        ksft_pr(f"Interface: {self.ifname}, driver: {driver}")     def __enter__(self):        ip(f"link set dev {self.dev['ifname']} up")        wait_file(f"/sys/class/net/{self.dev['ifname']}/carrier",                  lambda x: x.strip() == "1")         return self     def __exit__(self, ex_type, ex_value, ex_tb):        """        __exit__ gets called at the end of a "with" block.        """        self.__del__()  class NetDrvEnv(NetDrvEnvBase):    """    Class for a single NIC / host env, with no remote end    """    def __init__(self, src_path, nsim_test=None, **kwargs):        super().__init__(src_path)         self._ns = None         if 'NETIF' in self.env:            if nsim_test is True:                raise KsftXfailEx("Test only works on netdevsim")             self.dev = ip("-d link show dev " + self.env['NETIF'], json=True)[0]        else:            if nsim_test is False:                raise KsftXfailEx("Test does not work on netdevsim")             self._ns = NetdevSimDev(**kwargs)            self.dev = self._ns.nsims[0].dev        self.ifname = self.dev['ifname']        self.ifindex = self.dev['ifindex']        self._print_dev_info()     def __del__(self):        if self._ns:            self._ns.remove()            self._ns = None  class NetDrvEpEnv(NetDrvEnvBase):    """    Class for an environment with a local device and "remote endpoint"    which can be used to send traffic in.     For local testing it creates two network namespaces and a pair    of netdevsim devices.    """     # Network prefixes used for local tests    nsim_v4_pfx = "192.0.2."    nsim_v6_pfx = "2001:db8::"     def __init__(self, src_path, nsim_test=None, queue_count=None):        super().__init__(src_path)         self._stats_settle_time = None        self._queue_count = queue_count         # Things we try to destroy        self.remote = None        # These are for local testing state        self._netns = None        self._ns = None        self._ns_peer = None         self.addr_v        = { "4": None, "6": None }        self.remote_addr_v = { "4": None, "6": None }         if "NETIF" in self.env:            if nsim_test is True:                raise KsftXfailEx("Test only works on netdevsim")            self._check_env()             self.dev = ip("-d link show dev " + self.env['NETIF'], json=True)[0]             self.addr_v["4"] = self.env.get("LOCAL_V4")            self.addr_v["6"] = self.env.get("LOCAL_V6")            self.remote_addr_v["4"] = self.env.get("REMOTE_V4")            self.remote_addr_v["6"] = self.env.get("REMOTE_V6")            kind = self.env["REMOTE_TYPE"]            args = self.env["REMOTE_ARGS"]        else:            if nsim_test is False:                raise KsftXfailEx("Test does not work on netdevsim")             self.create_local()             self.dev = self._ns.nsims[0].dev             self.addr_v["4"] = self.nsim_v4_pfx + "1"            self.addr_v["6"] = self.nsim_v6_pfx + "1"            self.remote_addr_v["4"] = self.nsim_v4_pfx + "2"            self.remote_addr_v["6"] = self.nsim_v6_pfx + "2"            kind = "netns"            args = self._netns.name         self.remote = Remote(kind, args, src_path)         self.set_ipver("6" if self.addr_v["6"] else "4")         self.ifname = self.dev['ifname']        self.ifindex = self.dev['ifindex']        self._print_dev_info()         # resolve remote interface name        self.remote_ifname = self.resolve_remote_ifc()        self.remote_dev = ip("-d link show dev " + self.remote_ifname,                             host=self.remote, json=True)[0]        self.remote_ifindex = self.remote_dev['ifindex']         self._required_cmd = {}     def create_local(self):        nsim_kwargs = {}        if self._queue_count:            nsim_kwargs["queue_count"] = self._queue_count         self._netns = NetNS()        self._ns = NetdevSimDev(**nsim_kwargs)        self._ns_peer = NetdevSimDev(ns=self._netns, **nsim_kwargs)         with open("/proc/self/ns/net") as nsfd0, \             open("/var/run/netns/" + self._netns.name) as nsfd1:            ifi0 = self._ns.nsims[0].ifindex            ifi1 = self._ns_peer.nsims[0].ifindex            NetdevSimDev.ctrl_write('link_device',                                    f'{nsfd0.fileno()}:{ifi0} {nsfd1.fileno()}:{ifi1}')         ip(f"   addr add dev {self._ns.nsims[0].ifname} {self.nsim_v4_pfx}1/24")        ip(f"-6 addr add dev {self._ns.nsims[0].ifname} {self.nsim_v6_pfx}1/64 nodad")        ip(f"   link set dev {self._ns.nsims[0].ifname} up")         ip(f"   addr add dev {self._ns_peer.nsims[0].ifname} {self.nsim_v4_pfx}2/24", ns=self._netns)        ip(f"-6 addr add dev {self._ns_peer.nsims[0].ifname} {self.nsim_v6_pfx}2/64 nodad", ns=self._netns)        ip(f"   link set dev {self._ns_peer.nsims[0].ifname} up", ns=self._netns)     def _check_env(self):        vars_needed = [            ["LOCAL_V4", "LOCAL_V6"],            ["REMOTE_V4", "REMOTE_V6"],            ["REMOTE_TYPE"],            ["REMOTE_ARGS"]        ]        missing = []         for choice in vars_needed:            for entry in choice:                if entry in self.env:                    break            else:                missing.append(choice)        # Make sure v4 / v6 configs are symmetric        if ("LOCAL_V6" in self.env) != ("REMOTE_V6" in self.env):            missing.append(["LOCAL_V6", "REMOTE_V6"])        if ("LOCAL_V4" in self.env) != ("REMOTE_V4" in self.env):            missing.append(["LOCAL_V4", "REMOTE_V4"])        if missing:            raise Exception("Invalid environment, missing configuration:", missing,                            "Please see tools/testing/selftests/drivers/net/README.rst")     def resolve_remote_ifc(self):        v4 = v6 = None        if self.remote_addr_v["4"]:            v4 = ip("addr show to " + self.remote_addr_v["4"], json=True, host=self.remote)        if self.remote_addr_v["6"]:            v6 = ip("addr show to " + self.remote_addr_v["6"], json=True, host=self.remote)        if v4 and v6 and v4[0]["ifname"] != v6[0]["ifname"]:            raise Exception("Can't resolve remote interface name, v4 and v6 don't match")        if (v4 and len(v4) > 1) or (v6 and len(v6) > 1):            raise Exception("Can't resolve remote interface name, multiple interfaces match")        return v6[0]["ifname"] if v6 else v4[0]["ifname"]     def __del__(self):        if self._ns:            self._ns.remove()            self._ns = None        if self._ns_peer:            self._ns_peer.remove()            self._ns_peer = None        if self._netns:            del self._netns            self._netns = None        if self.remote:            del self.remote            self.remote = None     def require_ipver(self, ipver):        if not self.addr_v[ipver] or not self.remote_addr_v[ipver]:            raise KsftSkipEx(f"Test requires IPv{ipver} connectivity")     def set_ipver(self, ipver):        """        Modify the IP version used by the generic address fields.        """        if ipver == getattr(self, "addr_ipver", None):            return         self.require_ipver(ipver)         self.addr_ipver = ipver        self.addr = self.addr_v[ipver]        self.remote_addr = self.remote_addr_v[ipver]         # Bracketed addresses, some commands need IPv6 to be inside []        self.baddr = (f"[{self.addr_v['6']}]" if ipver == "6"                      else self.addr_v["4"])        self.remote_baddr = (f"[{self.remote_addr_v['6']}]" if ipver == "6"                             else self.remote_addr_v["4"])     def require_nsim(self, nsim_test=True):        """Require or exclude netdevsim for this test"""        if nsim_test and self._ns is None:            raise KsftXfailEx("Test only works on netdevsim")        if nsim_test is False and self._ns is not None:            raise KsftXfailEx("Test does not work on netdevsim")     def get_local_nsim_dev(self):        """Returns the local netdevsim device or None.           Using this method is discouraged, as it makes tests nsim-specific.           Standard interfaces available on all HW should ideally be used.           This method is intended for the few cases where nsim-specific           assertions need to be verified which cannot be verified otherwise.        """        return self._ns     def _require_cmd(self, comm, key, host=None):        cached = self._required_cmd.get(comm, {})        if cached.get(key) is None:            cached[key] = cmd("command -v -- " + comm, fail=False,                              shell=True, host=host).ret == 0        self._required_cmd[comm] = cached        return cached[key]     def require_cmd(self, comm, local=True, remote=False):        if local:            if not self._require_cmd(comm, "local"):                raise KsftSkipEx("Test requires command: " + comm)        if remote:            if not self._require_cmd(comm, "remote", host=self.remote):                raise KsftSkipEx("Test requires (remote) command: " + comm)     def wait_hw_stats_settle(self):        """        Wait for HW stats to become consistent, some devices DMA HW stats        periodically so events won't be reflected until next sync.        Good drivers will tell us via ethtool what their sync period is.        """        if self._stats_settle_time is None:            data = {}            try:                data = ethtool("-c " + self.ifname, json=True)[0]            except CmdExitFailure as e:                if "Operation not supported" not in e.cmd.stderr:                    raise             self._stats_settle_time = \                1.25 * data.get('stats-block-usecs', 20000) / 1000 / 1000         time.sleep(self._stats_settle_time)  class NetDrvContEnv(NetDrvEpEnv):    """    Class for an environment with a netkit pair setup for forwarding traffic    between the physical interface and a network namespace.      NETIF           = "eth0"      LOCAL_V6        = "2001:db8:1::1"      REMOTE_V6       = "2001:db8:1::2"      LOCAL_PREFIX_V6 = "2001:db8:2::0/64"               +-----------------------------+        +------------------------------+      dst     | INIT NS                     |        | TEST NS                      |      2001:   | +---------------+           |        |                              |      db8:2::2| | NETIF         |           |  bpf   |                              |          +---|>| 2001:db8:1::1 |           |redirect| +-------------------------+  |          |   | |               |-----------|--------|>| Netkit                  |  |          |   | +---------------+           | _peer  | | nk_guest                |  |          |   | +-------------+ Netkit pair |        | | fe80::2/64              |  |          |   | | Netkit      |.............|........|>| 2001:db8:2::2/64        |  |          |   | | nk_host     |             |        | +-------------------------+  |          |   | | fe80::1/64  |             |        |                              |          |   | +-------------+             |        | route:                       |          |   |                             |        |   default                    |          |   | route:                      |        |     via fe80::1 dev nk_guest |          |   |   2001:db8:2::2/128         |        +------------------------------+          |   |     via fe80::2 dev nk_host |          |   +-----------------------------+          |          |   +---------------+          |   | REMOTE        |          +---| 2001:db8:1::2 |              +---------------+    """     def __init__(self, src_path, rxqueues=1, primary_rx_redirect=False,                 userns=False, **kwargs):        self.netns = None        self._userns = userns        self.nk_host_ifname = None        self.nk_guest_ifname = None        self._tc_clsact_added = False        self._tc_attached = False        self._primary_rx_redirect_attached = False        self._primary_rx_redirect_clsact_added = False        self._bpf_prog_pref = None        self._bpf_prog_id = None        self._init_ns_attached = False        self._remote_route_added = False        self._old_fwd = None        self._old_accept_ra = None         super().__init__(src_path, **kwargs)         self.require_ipver("6")        local_prefix = self.env.get("LOCAL_PREFIX_V6")        if not local_prefix:            raise KsftSkipEx("LOCAL_PREFIX_V6 required")         net = ipaddress.IPv6Network(local_prefix, strict=False)        self.ipv6_prefix = str(net.network_address)        self.nk_host_ipv6 = f"{self.ipv6_prefix}2:1"        self.nk_guest_ipv6 = f"{self.ipv6_prefix}2:2"         local_v6 = ipaddress.IPv6Address(self.addr_v["6"])        if local_v6 in net:            raise KsftSkipEx("LOCAL_V6 must not fall within LOCAL_PREFIX_V6")         rtnl = RtnlFamily()        rtnl.newlink(            {                "linkinfo": {                    "kind": "netkit",                    "data": {                        "mode": "l2",                        "policy": "forward",                        "peer-policy": "forward",                    },                },                "num-rx-queues": rxqueues,            },            flags=[Netlink.NLM_F_CREATE, Netlink.NLM_F_EXCL],        )         all_links = ip("-d link show", json=True)        netkit_links = [link for link in all_links                        if link.get('linkinfo', {}).get('info_kind') == 'netkit'                        and 'UP' not in link.get('flags', [])]         if len(netkit_links) != 2:            raise KsftSkipEx("Failed to create netkit pair")         netkit_links.sort(key=lambda x: x['ifindex'])        self.nk_host_ifname = netkit_links[1]['ifname']        self.nk_guest_ifname = netkit_links[0]['ifname']        self.nk_host_ifindex = netkit_links[1]['ifindex']        self.nk_guest_ifindex = netkit_links[0]['ifindex']         self._setup_ns()        self.attach_bpf()        if primary_rx_redirect:            self._attach_primary_rx_redirect_bpf()     def __del__(self):        if self._primary_rx_redirect_attached:            cmd(f"tc filter del dev {self.nk_host_ifname} ingress", fail=False)            self._primary_rx_redirect_attached = False         if self._primary_rx_redirect_clsact_added:            cmd(f"tc qdisc del dev {self.nk_host_ifname} clsact", fail=False)            self._primary_rx_redirect_clsact_added = False         if self._tc_attached:            cmd(f"tc filter del dev {self.ifname} ingress pref {self._bpf_prog_pref}")            self._tc_attached = False         if self._tc_clsact_added:            cmd(f"tc qdisc del dev {self.ifname} clsact")            self._tc_clsact_added = False         if self._remote_route_added:            cmd(f"ip -6 route del {self.nk_guest_ipv6}/128",                host=self.remote, fail=False)            self._remote_route_added = False         if self.nk_host_ifname:            cmd(f"ip link del dev {self.nk_host_ifname}")            self.nk_host_ifname = None            self.nk_guest_ifname = None         if self._init_ns_attached:            cmd("ip netns del init", fail=False)            self._init_ns_attached = False         if self.netns:            del self.netns            self.netns = None         if self._old_fwd is not None:            with open("/proc/sys/net/ipv6/conf/all/forwarding", "w",                      encoding="utf-8") as f:                f.write(self._old_fwd)            self._old_fwd = None        if self._old_accept_ra is not None:            with open("/proc/sys/net/ipv6/conf/all/accept_ra", "w",                      encoding="utf-8") as f:                f.write(self._old_accept_ra)            self._old_accept_ra = None         super().__del__()     def _setup_ns(self):        fwd_path = "/proc/sys/net/ipv6/conf/all/forwarding"        ra_path = "/proc/sys/net/ipv6/conf/all/accept_ra"        with open(fwd_path, encoding="utf-8") as f:            self._old_fwd = f.read().strip()        with open(ra_path, encoding="utf-8") as f:            self._old_accept_ra = f.read().strip()        with open(fwd_path, "w", encoding="utf-8") as f:

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