[PATCH v13.1 23/26] COLO nic: implement COLO nic subkind

[Changlong Xie <xiecl.fnst@cn.fujitsu.com>]

 From 699f20d46fcce0bcce8fd7f7063551088a425254 Mon Sep 17 00:00:00 2001
From: Wen Congyang <wency@cn.fujitsu.com>
Date: Wed, 15 Jul 2015 17:18:53 +0800
Subject: [PATCH v13.1 23/26] COLO nic: implement COLO nic subkind

implement COLO nic subkind.

Signed-off-by: Yang Hongyang <hongyang.yang@easystack.cn>
Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
Signed-off-by: Changlong Xie <xiecl.fnst@cn.fujitsu.com>
---
  tools/hotplug/Linux/Makefile         |   1 +
  tools/hotplug/Linux/colo-proxy-setup | 135 +++++++++++++++
  tools/libxl/Makefile                 |   1 +
  tools/libxl/libxl_colo.h             |  10 ++
  tools/libxl/libxl_colo_nic.c         | 320 
+++++++++++++++++++++++++++++++++++
  tools/libxl/libxl_internal.h         |   2 +
  tools/libxl/libxl_types.idl          |   3 +
  7 files changed, 472 insertions(+)
  create mode 100755 tools/hotplug/Linux/colo-proxy-setup
  create mode 100644 tools/libxl/libxl_colo_nic.c

diff --git a/tools/hotplug/Linux/Makefile b/tools/hotplug/Linux/Makefile
index 6e10118..9bb852b 100644
--- a/tools/hotplug/Linux/Makefile
+++ b/tools/hotplug/Linux/Makefile
@@ -28,6 +28,7 @@ XEN_SCRIPTS += block-iscsi
  XEN_SCRIPTS += block-tap
  XEN_SCRIPTS += block-drbd-probe
  XEN_SCRIPTS += $(XEN_SCRIPTS-y)
+XEN_SCRIPTS += colo-proxy-setup

  SUBDIRS-$(CONFIG_SYSTEMD) += systemd

diff --git a/tools/hotplug/Linux/colo-proxy-setup 
b/tools/hotplug/Linux/colo-proxy-setup
new file mode 100755
index 0000000..94e2034
--- /dev/null
+++ b/tools/hotplug/Linux/colo-proxy-setup
@@ -0,0 +1,135 @@
+#! /bin/bash
+
+dir=$(dirname "$0")
+. "$dir/xen-hotplug-common.sh"
+. "$dir/hotplugpath.sh"
+
+findCommand "$@"
+
+if [ "$command" != "setup" -a  "$command" != "teardown" ]
+then
+    echo "Invalid command: $command"
+    log err "Invalid command: $command"
+    exit 1
+fi
+
+evalVariables "$@"
+
+: ${vifname:?}
+: ${forwarddev:?}
+: ${mode:?}
+: ${index:?}
+: ${bridge:?}
+
+forwardbr="colobr0"
+
+if [ "$mode" != "primary" -a "$mode" != "secondary" ]
+then
+    echo "Invalid mode: $mode"
+    log err "Invalid mode: $mode"
+    exit 1
+fi
+
+if [ $index -lt 0 ] || [ $index -gt 100 ]; then
+    echo "index overflow"
+    exit 1
+fi
+
+function setup_primary()
+{
+    do_without_error tc qdisc add dev $vifname root handle 1: prio
+    do_without_error tc filter add dev $vifname parent 1: protocol ip 
prio 10 \
+        u32 match u32 0 0 flowid 1:2 action mirred egress mirror dev 
$forwarddev
+    do_without_error tc filter add dev $vifname parent 1: protocol arp 
prio 11 \
+        u32 match u32 0 0 flowid 1:2 action mirred egress mirror dev 
$forwarddev
+    do_without_error tc filter add dev $vifname parent 1: protocol ipv6 
prio \
+        12 u32 match u32 0 0 flowid 1:2 action mirred egress mirror \
+        dev $forwarddev
+
+    do_without_error modprobe nf_conntrack_ipv4
+    do_without_error modprobe xt_PMYCOLO sec_dev=$forwarddev
+
+    iptables -t mangle -I PREROUTING -m physdev --physdev-in \
+        $vifname -j PMYCOLO --index $index
+    ip6tables -t mangle -I PREROUTING -m physdev --physdev-in \
+        $vifname -j PMYCOLO --index $index
+    do_without_error arptables -I INPUT -i $forwarddev -j MARK 
--set-mark $index
+}
+
+function teardown_primary()
+{
+    do_without_error tc filter del dev $vifname parent 1: protocol ip 
prio 10 u32 match u32 \
+        0 0 flowid 1:2 action mirred egress mirror dev $forwarddev
+    do_without_error tc filter del dev $vifname parent 1: protocol arp 
prio 11 u32 match u32 \
+        0 0 flowid 1:2 action mirred egress mirror dev $forwarddev
+    do_without_error tc filter del dev $vifname parent 1: protocol ipv6 
prio 12 u32 match u32 \
+        0 0 flowid 1:2 action mirred egress mirror dev $forwarddev
+    do_without_error tc qdisc del dev $vifname root handle 1: prio
+
+    do_without_error iptables -t mangle -D PREROUTING -m physdev 
--physdev-in \
+        $vifname -j PMYCOLO --index $index
+    do_without_error ip6tables -t mangle -D PREROUTING -m physdev 
--physdev-in \
+        $vifname -j PMYCOLO --index $index
+    do_without_error arptables -F
+    do_without_error rmmod xt_PMYCOLO
+}
+
+function setup_secondary()
+{
+    do_without_error brctl delif $bridge $vifname
+    do_without_error brctl addbr $forwardbr
+    do_without_error brctl addif $forwardbr $vifname
+    do_without_error brctl addif $forwardbr $forwarddev
+    do_without_error ip link set dev $forwardbr up
+    do_without_error modprobe xt_SECCOLO
+
+    iptables -t mangle -I PREROUTING -m physdev --physdev-in \
+        $vifname -j SECCOLO --index $index
+    ip6tables -t mangle -I PREROUTING -m physdev --physdev-in \
+        $vifname -j SECCOLO --index $index
+}
+
+function teardown_secondary()
+{
+    do_without_error brctl delif $forwardbr $forwarddev
+    do_without_error brctl delif $forwardbr $vifname
+    do_without_error brctl delbr $forwardbr
+    do_without_error brctl addif $bridge $vifname
+
+    do_without_error iptables -t mangle -D PREROUTING -m physdev 
--physdev-in \
+        $vifname -j SECCOLO --index $index
+    do_without_error ip6tables -t mangle -D PREROUTING -m physdev 
--physdev-in \
+        $vifname -j SECCOLO --index $index
+    do_without_error rmmod xt_SECCOLO
+}
+
+case "$command" in
+    setup)
+        if [ "$mode" = "primary" ]
+        then
+            setup_primary
+        else
+            setup_secondary
+        fi
+
+        success
+        ;;
+    teardown)
+        if [ "$mode" = "primary" ]
+        then
+            teardown_primary
+        else
+            teardown_secondary
+        fi
+        ;;
+esac
+
+if [ "$mode" = "primary" ]
+then
+    log debug "Successful colo-proxy-setup $command for $vifname." \
+              " vifname: $vifname, index: $index, forwarddev: $forwarddev."
+else
+    log debug "Successful colo-proxy-setup $command for $vifname." \
+              " vifname: $vifname, index: $index, forwarddev: 
$forwarddev,"\
+              " forwardbr: $forwardbr."
+fi
diff --git a/tools/libxl/Makefile b/tools/libxl/Makefile
index 72f3b1a..a433aaa 100644
--- a/tools/libxl/Makefile
+++ b/tools/libxl/Makefile
@@ -68,6 +68,7 @@ LIBXL_OBJS-y += libxl_remus.o 
libxl_checkpoint_device.o libxl_remus_disk_drbd.o
  LIBXL_OBJS-y += libxl_colo_restore.o libxl_colo_save.o
  LIBXL_OBJS-y += libxl_colo_qdisk.o
  LIBXL_OBJS-y += libxl_colo_proxy.o
+LIBXL_OBJS-y += libxl_colo_nic.o

  LIBXL_OBJS-$(CONFIG_X86) += libxl_cpuid.o libxl_x86.o libxl_psr.o
  LIBXL_OBJS-$(CONFIG_ARM) += libxl_nocpuid.o libxl_arm.o 
libxl_libfdt_compat.o
diff --git a/tools/libxl/libxl_colo.h b/tools/libxl/libxl_colo.h
index a529ce8..5fbb659 100644
--- a/tools/libxl/libxl_colo.h
+++ b/tools/libxl/libxl_colo.h
@@ -40,6 +40,11 @@ enum colo_netlink_op {
      COLO_PROXY_RESET, /* UNUSED, will be used for continuous FT */
  };

+typedef struct libxl__colo_device_nic {
+    int devid;
+    const char *vif;
+} libxl__colo_device_nic;
+
  typedef struct libxl__colo_qdisk {
      bool setuped;
  } libxl__colo_qdisk;
@@ -70,6 +75,7 @@ struct libxl__colo_restore_state {
      int recv_fd;
      int hvm;
      libxl__colo_callback *callback;
+    char *colo_proxy_script;

      /* private, colo restore checkpoint state */
      libxl__domain_create_cb *saved_cb;
@@ -89,6 +95,10 @@ int init_subkind_qdisk(struct 
libxl__checkpoint_devices_state *cds);

  void cleanup_subkind_qdisk(struct libxl__checkpoint_devices_state *cds);

+int init_subkind_colo_nic(struct libxl__checkpoint_devices_state *cds);
+
+void cleanup_subkind_colo_nic(struct libxl__checkpoint_devices_state *cds);
+
  extern void libxl__colo_restore_setup(struct libxl__egc *egc,
                                        libxl__colo_restore_state *crs);
  extern void libxl__colo_restore_teardown(struct libxl__egc *egc, void 
*dcs_void,
diff --git a/tools/libxl/libxl_colo_nic.c b/tools/libxl/libxl_colo_nic.c
new file mode 100644
index 0000000..2e00c28
--- /dev/null
+++ b/tools/libxl/libxl_colo_nic.c
@@ -0,0 +1,320 @@
+/*
+ * Copyright (C) 2016 FUJITSU LIMITED
+ * Author: Wen Congyang <wency@cn.fujitsu.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published
+ * by the Free Software Foundation; version 2.1 only. with the special
+ * exception on linking described in file LICENSE.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ */
+
+#include "libxl_osdeps.h" /* must come before any other headers */
+
+#include "libxl_internal.h"
+
+enum {
+    primary,
+    secondary,
+};
+
+/* ========== init() and cleanup() ========== */
+
+int init_subkind_colo_nic(libxl__checkpoint_devices_state *cds)
+{
+    return 0;
+}
+
+void cleanup_subkind_colo_nic(libxl__checkpoint_devices_state *cds)
+{
+}
+
+/* ========== helper functions ========== */
+
+static void colo_save_setup_script_cb(libxl__egc *egc,
+                                     libxl__async_exec_state *aes,
+                                     int rc, int status);
+static void colo_save_teardown_script_cb(libxl__egc *egc,
+                                         libxl__async_exec_state *aes,
+                                         int rc, int status);
+
+/*
+ * If the device has a vifname, then use that instead of
+ * the vifX.Y format.
+ * it must ONLY be used for remus because if driver domains
+ * were in use it would constitute a security vulnerability.
+ */
+static const char *get_vifname(libxl__checkpoint_device *dev,
+                               const libxl_device_nic *nic)
+{
+    const char *vifname = NULL;
+    const char *path;
+    int rc;
+
+    STATE_AO_GC(dev->cds->ao);
+
+    /* Convenience aliases */
+    const uint32_t domid = dev->cds->domid;
+
+    path = GCSPRINTF("%s/backend/vif/%d/%d/vifname",
+                     libxl__xs_get_dompath(gc, 0), domid, nic->devid);
+    rc = libxl__xs_read_checked(gc, XBT_NULL, path, &vifname);
+    if (!rc && !vifname) {
+        vifname = libxl__device_nic_devname(gc, domid,
+                                            nic->devid,
+                                            nic->nictype);
+    }
+
+    return vifname;
+}
+
+/*
+ * the script needs the following env & args
+ * $vifname
+ * $forwarddev
+ * $mode(primary/secondary)
+ * $index
+ * $bridge
+ * setup/teardown as command line arg.
+ */
+static void setup_async_exec(libxl__checkpoint_device *dev, char *op,
+                             libxl__colo_proxy_state *cps, int side,
+                             char *colo_proxy_script)
+{
+    int arraysize, nr = 0;
+    char **env = NULL, **args = NULL;
+    libxl__colo_device_nic *colo_nic = dev->concrete_data;
+    libxl__checkpoint_devices_state *cds = dev->cds;
+    libxl__async_exec_state *aes = &dev->aodev.aes;
+    const libxl_device_nic *nic = dev->backend_dev;
+
+    STATE_AO_GC(cds->ao);
+
+    /* Convenience aliases */
+    const char *const vif = colo_nic->vif;
+
+    arraysize = 11;
+    GCNEW_ARRAY(env, arraysize);
+    env[nr++] = "vifname";
+    env[nr++] = libxl__strdup(gc, vif);
+    env[nr++] = "forwarddev";
+    env[nr++] = libxl__strdup(gc, nic->coloft_forwarddev);
+    env[nr++] = "mode";
+    if (side == primary)
+        env[nr++] = "primary";
+    else
+        env[nr++] = "secondary";
+    env[nr++] = "index";
+    env[nr++] = GCSPRINTF("%d", cps->index);
+    env[nr++] = "bridge";
+    env[nr++] = libxl__strdup(gc, nic->bridge);
+    env[nr++] = NULL;
+    assert(nr == arraysize);
+
+    arraysize = 3; nr = 0;
+    GCNEW_ARRAY(args, arraysize);
+    args[nr++] = colo_proxy_script;
+    args[nr++] = op;
+    args[nr++] = NULL;
+    assert(nr == arraysize);
+
+    aes->ao = dev->cds->ao;
+    aes->what = GCSPRINTF("%s %s", args[0], args[1]);
+    aes->env = env;
+    aes->args = args;
+    aes->timeout_ms = LIBXL_HOTPLUG_TIMEOUT * 1000;
+    aes->stdfds[0] = -1;
+    aes->stdfds[1] = -1;
+    aes->stdfds[2] = -1;
+
+    if (!strcmp(op, "teardown"))
+        aes->callback = colo_save_teardown_script_cb;
+    else
+        aes->callback = colo_save_setup_script_cb;
+}
+
+/* ========== setup() and teardown() ========== */
+
+static void colo_nic_setup(libxl__egc *egc, libxl__checkpoint_device *dev,
+                           libxl__colo_proxy_state *cps, int side,
+                           char *colo_proxy_script)
+{
+    int rc;
+    libxl__colo_device_nic *colo_nic;
+    const libxl_device_nic *nic = dev->backend_dev;
+
+    STATE_AO_GC(dev->cds->ao);
+
+    /*
+     * thers's no subkind of nic devices, so nic ops is always matched
+     * with nic devices, we begin to setup the nic device
+     */
+    dev->matched = 1;
+
+    if (!nic->coloft_forwarddev) {
+        rc = ERROR_FAIL;
+        goto out;
+    }
+
+    GCNEW(colo_nic);
+    dev->concrete_data = colo_nic;
+    colo_nic->devid = nic->devid;
+    colo_nic->vif = get_vifname(dev, nic);
+    if (!colo_nic->vif) {
+        rc = ERROR_FAIL;
+        goto out;
+    }
+
+    setup_async_exec(dev, "setup", cps, side, colo_proxy_script);
+    rc = libxl__async_exec_start(&dev->aodev.aes);
+    if (rc)
+        goto out;
+
+    return;
+
+out:
+    dev->aodev.rc = rc;
+    dev->aodev.callback(egc, &dev->aodev);
+}
+
+static void colo_save_setup_script_cb(libxl__egc *egc,
+                                      libxl__async_exec_state *aes,
+                                      int rc, int status)
+{
+    libxl__ao_device *aodev = CONTAINER_OF(aes, *aodev, aes);
+    libxl__checkpoint_device *dev = CONTAINER_OF(aodev, *dev, aodev);
+    libxl__colo_device_nic *colo_nic = dev->concrete_data;
+    libxl__checkpoint_devices_state *cds = dev->cds;
+    const char *out_path_base, *hotplug_error = NULL;
+
+    EGC_GC;
+
+    /* Convenience aliases */
+    const uint32_t domid = cds->domid;
+    const int devid = colo_nic->devid;
+    const char *const vif = colo_nic->vif;
+
+    if (status && !rc)
+        rc = ERROR_FAIL;
+    if (rc)
+        goto out;
+
+    out_path_base = GCSPRINTF("%s/colo_proxy/%d",
+                              libxl__xs_libxl_path(gc, domid), devid);
+
+    rc = libxl__xs_read_checked(gc, XBT_NULL,
+                                GCSPRINTF("%s/hotplug-error", 
out_path_base),
+                                &hotplug_error);
+    if (rc)
+        goto out;
+
+    if (hotplug_error) {
+        LOG(ERROR, "colo_proxy script %s setup failed for vif %s: %s",
+            aes->args[0], vif, hotplug_error);
+        rc = ERROR_FAIL;
+        goto out;
+    }
+
+    if (status) {
+        rc = ERROR_FAIL;
+        goto out;
+    }
+
+    rc = 0;
+
+out:
+    aodev->rc = rc;
+    aodev->callback(egc, aodev);
+}
+
+static void colo_nic_teardown(libxl__egc *egc, libxl__checkpoint_device 
*dev,
+                              libxl__colo_proxy_state *cps, int side,
+                              char *colo_proxy_script)
+{
+    int rc;
+    libxl__colo_device_nic *colo_nic = dev->concrete_data;
+
+    if (!colo_nic || !colo_nic->vif) {
+        /* colo nic has not yet been set up, just return */
+        rc = 0;
+        goto out;
+    }
+
+    setup_async_exec(dev, "teardown", cps, side, colo_proxy_script);
+
+    rc = libxl__async_exec_start(&dev->aodev.aes);
+    if (rc)
+        goto out;
+
+    return;
+
+out:
+    dev->aodev.rc = rc;
+    dev->aodev.callback(egc, &dev->aodev);
+}
+
+static void colo_save_teardown_script_cb(libxl__egc *egc,
+                                         libxl__async_exec_state *aes,
+                                         int rc, int status)
+{
+    libxl__ao_device *aodev = CONTAINER_OF(aes, *aodev, aes);
+
+    if (status && !rc)
+        rc = ERROR_FAIL;
+    else
+        rc = 0;
+
+    aodev->rc = rc;
+    aodev->callback(egc, aodev);
+}
+
+/* ======== primary ======== */
+
+static void colo_nic_save_setup(libxl__egc *egc, 
libxl__checkpoint_device *dev)
+{
+    libxl__colo_save_state *css = dev->cds->concrete_data;
+
+    colo_nic_setup(egc, dev, &css->cps, primary, css->colo_proxy_script);
+}
+
+static void colo_nic_save_teardown(libxl__egc *egc,
+                                   libxl__checkpoint_device *dev)
+{
+    libxl__colo_save_state *css = dev->cds->concrete_data;
+
+    colo_nic_teardown(egc, dev, &css->cps, primary, 
css->colo_proxy_script);
+}
+
+const libxl__checkpoint_device_instance_ops colo_save_device_nic = {
+    .kind = LIBXL__DEVICE_KIND_VIF,
+    .setup = colo_nic_save_setup,
+    .teardown = colo_nic_save_teardown,
+};
+
+/* ======== secondary ======== */
+
+static void colo_nic_restore_setup(libxl__egc *egc,
+                                   libxl__checkpoint_device *dev)
+{
+    libxl__colo_restore_state *crs = dev->cds->concrete_data;
+
+    colo_nic_setup(egc, dev, &crs->cps, secondary, crs->colo_proxy_script);
+}
+
+static void colo_nic_restore_teardown(libxl__egc *egc,
+                                      libxl__checkpoint_device *dev)
+{
+    libxl__colo_restore_state *crs = dev->cds->concrete_data;
+
+    colo_nic_teardown(egc, dev, &crs->cps, secondary, 
crs->colo_proxy_script);
+}
+
+const libxl__checkpoint_device_instance_ops colo_restore_device_nic = {
+    .kind = LIBXL__DEVICE_KIND_VIF,
+    .setup = colo_nic_restore_setup,
+    .teardown = colo_nic_restore_teardown,
+};
diff --git a/tools/libxl/libxl_internal.h b/tools/libxl/libxl_internal.h
index 8f02222..759b8d0 100644
--- a/tools/libxl/libxl_internal.h
+++ b/tools/libxl/libxl_internal.h
@@ -3206,6 +3206,7 @@ typedef struct libxl__colo_save_state 
libxl__colo_save_state;
  struct libxl__colo_save_state {
      int send_fd;
      int recv_fd;
+    char *colo_proxy_script;

      /* private */
      libxl__stream_read_state srs;
@@ -3554,6 +3555,7 @@ struct libxl__domain_create_state {
      libxl_asyncprogress_how aop_console_how;
      /* private to domain_create */
      int guest_domid;
+    const char *colo_proxy_script;
      libxl__domain_build_state build_state;
      libxl__colo_restore_state crs;
      libxl__checkpoint_devices_state cds;
diff --git a/tools/libxl/libxl_types.idl b/tools/libxl/libxl_types.idl
index 8335291..f88fae0 100644
--- a/tools/libxl/libxl_types.idl
+++ b/tools/libxl/libxl_types.idl
@@ -602,6 +602,9 @@ libxl_device_nic = Struct("device_nic", [
      ("rate_bytes_per_interval", uint64),
      ("rate_interval_usecs", uint32),
      ("gatewaydev", string),
+    # Note that the COLO configuration settings should be considered 
unstable.
+    # They may change incompatibly in future versions of Xen.
+    ("coloft_forwarddev", string)
      ])

  libxl_device_pci = Struct("device_pci", [
-- 
1.9.3




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