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Thu, 02 Sep 2021 14:20:25 -0700 (PDT) Date: Thu, 2 Sep 2021 14:20:15 -0700 Message-Id: <20210902212015.1303865-1-dje@google.com> Mime-Version: 1.0 X-Mailer: git-send-email 2.33.0.153.gba50c8fa24-goog Subject: [PATCH] net: Add "info neighbors" command From: Doug Evans To: qemu-devel@nongnu.org Cc: "Dr. David Alan Gilbert" , Samuel Thibault , Jason Wang , "=?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?=" , Doug Evans Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::b4a; envelope-from=3GUAxYQMKCm4PVQSaaSXQ.OaYcQYg-PQhQXZaZSZg.adS@flex--dje.bounces.google.com; helo=mail-yb1-xb4a.google.com X-Spam_score_int: -95 X-Spam_score: -9.6 X-Spam_bar: --------- X-Spam_report: (-9.6 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, USER_IN_DEF_DKIM_WL=-7.5 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @google.com) X-ZM-MESSAGEID: 1630617704776100001 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" This command dumps the ARP and NDP tables maintained within slirp. One use-case for it is showing the guest's IPv6 address(es). Signed-off-by: Doug Evans Reviewed-by: Patrick Venture --- hmp-commands-info.hx | 15 +++++++ include/net/slirp.h | 1 + net/slirp.c | 15 +++++++ tests/acceptance/info_neighbors.py | 69 ++++++++++++++++++++++++++++++ 4 files changed, 100 insertions(+) create mode 100644 tests/acceptance/info_neighbors.py diff --git a/hmp-commands-info.hx b/hmp-commands-info.hx index 27206ac049..386f09f163 100644 --- a/hmp-commands-info.hx +++ b/hmp-commands-info.hx @@ -512,6 +512,21 @@ SRST Show user network stack connection states. ERST =20 +#if defined(CONFIG_SLIRP) + { + .name =3D "neighbors", + .args_type =3D "", + .params =3D "", + .help =3D "show the ARP and NDP tables", + .cmd =3D hmp_info_neighbors, + }, +#endif + +SRST + ``info neighbors`` + Show the ARP and NDP tables. +ERST + { .name =3D "migrate", .args_type =3D "", diff --git a/include/net/slirp.h b/include/net/slirp.h index bad3e1e241..b9ccfda1e7 100644 --- a/include/net/slirp.h +++ b/include/net/slirp.h @@ -31,6 +31,7 @@ void hmp_hostfwd_add(Monitor *mon, const QDict *qdict); void hmp_hostfwd_remove(Monitor *mon, const QDict *qdict); =20 void hmp_info_usernet(Monitor *mon, const QDict *qdict); +void hmp_info_neighbors(Monitor *mon, const QDict *qdict); =20 #endif =20 diff --git a/net/slirp.c b/net/slirp.c index ad3a838e0b..29a4cd3fe1 100644 --- a/net/slirp.c +++ b/net/slirp.c @@ -1028,6 +1028,21 @@ void hmp_info_usernet(Monitor *mon, const QDict *qdi= ct) } } =20 +void hmp_info_neighbors(Monitor *mon, const QDict *qdict) +{ + SlirpState *s; + + QTAILQ_FOREACH(s, &slirp_stacks, entry) { + int id; + bool got_hub_id =3D net_hub_id_for_client(&s->nc, &id) =3D=3D 0; + char *info =3D slirp_neighbor_info(s->slirp); + monitor_printf(mon, "Hub %d (%s):\n%s", + got_hub_id ? id : -1, + s->nc.name, info); + g_free(info); + } +} + static void net_init_slirp_configs(const StringList *fwd, int flags) { diff --git a/tests/acceptance/info_neighbors.py b/tests/acceptance/info_nei= ghbors.py new file mode 100644 index 0000000000..ff79ec3ff3 --- /dev/null +++ b/tests/acceptance/info_neighbors.py @@ -0,0 +1,69 @@ +# Test for the hmp command "info neighbors" +# +# Copyright 2021 Google LLC +# +# This work is licensed under the terms of the GNU GPL, version 2 or +# later. See the COPYING file in the top-level directory. + +import re + +from avocado_qemu import LinuxTest +from avocado_qemu import Test + +VNET_HUB_HEADER =3D 'Hub -1 (vnet):' +NEIGHBOR_HEADER_REGEX =3D '^ *Table *MacAddr *IP Address$' + +def trim(text): + return " ".join(text.split()) + +def hmc(test, cmd): + return test.vm.command('human-monitor-command', command_line=3Dcmd) + +def get_neighbors(test): + output =3D hmc(test, 'info neighbors').splitlines() + if len(output) < 2: + test.fail("Insufficient output from 'info neighbors'") + test.assertEquals(output[0], VNET_HUB_HEADER) + test.assertTrue(re.fullmatch(NEIGHBOR_HEADER_REGEX, output[1])) + return output[2:] + +class InfoNeighborsNone(Test): + + def test_no_neighbors(self): + self.vm.add_args('-nodefaults', + '-netdev', 'user,id=3Dvnet', + '-device', 'virtio-net,netdev=3Dvnet') + self.vm.launch() + neighbors =3D get_neighbors(self) + self.assertEquals(len(neighbors), 0) + +class InfoNeighbors(LinuxTest): + + def test_neighbors(self): + """ + :avocado: tags=3Darch:x86_64 + :avocado: tags=3Dmachine:pc + :avocado: tags=3Daccel:kvm + """ + self.require_accelerator('kvm') + self.vm.add_args("-accel", "kvm") + self.vm.add_args('-nographic', + '-m', '1024') + self.launch_and_wait() + + # Ensure there's some packets to the guest and back. + self.ssh_command('pwd') + + # We should now be aware of the guest as a neighbor. + expected_ipv4_neighbor =3D 'ARP 52:54:00:12:34:56 10.0.2.15' + # The default ipv6 net is fec0. Both fe80 and fec0 can appear. + expected_ipv6_neighbors =3D [ + 'NDP 52:54:00:12:34:56 fe80::5054:ff:fe12:3456', + 'NDP 52:54:00:12:34:56 fec0::5054:ff:fe12:3456' + ] + neighbors =3D get_neighbors(self) + self.assertTrue(len(neighbors) >=3D 2 and len(neighbors) <=3D 3) + # IPv4 is output first. + self.assertEquals(trim(neighbors[0]), expected_ipv4_neighbor) + for neighbor in neighbors[1:]: + self.assertTrue(trim(neighbor) in expected_ipv6_neighbors) --=20 2.33.0.153.gba50c8fa24-goog