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[libvirt] [PATCH 05/16] Move the low level macvlan creation APIs



From: "Daniel P. Berrange" <berrange redhat com>

Move the low level macvlan creation APIs into the
virnetdevmacvlan.c file where they more naturally
belong

* util/interface.c, util/interface.h: Remove virNetDevMacVLanCreate
  and virNetDevMacVLanDelete
* util/virnetdevmacvlan.c, util/virnetdevmacvlan.h: Add
  virNetDevMacVLanCreate and virNetDevMacVLanDelete
---
 src/util/interface.c        |  270 -------------------------------------------
 src/util/interface.h        |   12 --
 src/util/virnetdevmacvlan.c |  256 ++++++++++++++++++++++++++++++++++++++++-
 src/util/virnetdevmacvlan.h |   12 ++
 4 files changed, 264 insertions(+), 286 deletions(-)

diff --git a/src/util/interface.c b/src/util/interface.c
index a1c56f5..e757c6f 100644
--- a/src/util/interface.c
+++ b/src/util/interface.c
@@ -312,276 +312,6 @@ ifaceGetIPAddress(const char *ifname ATTRIBUTE_UNUSED,
 
 #endif /* __linux__ */
 
-/**
- * virNetDevMacVLanCreate:
- *
- * @ifname: The name the interface is supposed to have; optional parameter
- * @type: The type of device, i.e., "macvtap"
- * @macaddress: The MAC address of the device
- * @srcdev: The name of the 'link' device
- * @macvlan_mode: The macvlan mode to use
- * @retry: Pointer to integer that will be '1' upon return if an interface
- *         with the same name already exists and it is worth to try
- *         again with a different name
- *
- * Create a macvtap device with the given properties.
- *
- * Returns 0 on success, -1 on fatal error.
- */
-#if defined(__linux__) && WITH_MACVTAP
-int
-virNetDevMacVLanCreate(const char *ifname,
-                       const char *type,
-                       const unsigned char *macaddress,
-                       const char *srcdev,
-                       uint32_t macvlan_mode,
-                       int *retry)
-{
-    int rc = 0;
-    struct nlmsghdr *resp;
-    struct nlmsgerr *err;
-    struct ifinfomsg ifinfo = { .ifi_family = AF_UNSPEC };
-    int ifindex;
-    unsigned char *recvbuf = NULL;
-    unsigned int recvbuflen;
-    struct nl_msg *nl_msg;
-    struct nlattr *linkinfo, *info_data;
-
-    if (ifaceGetIndex(true, srcdev, &ifindex) < 0)
-        return -1;
-
-    *retry = 0;
-
-    nl_msg = nlmsg_alloc_simple(RTM_NEWLINK,
-                                NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL);
-    if (!nl_msg) {
-        virReportOOMError();
-        return -1;
-    }
-
-    if (nlmsg_append(nl_msg,  &ifinfo, sizeof(ifinfo), NLMSG_ALIGNTO) < 0)
-        goto buffer_too_small;
-
-    if (nla_put_u32(nl_msg, IFLA_LINK, ifindex) < 0)
-        goto buffer_too_small;
-
-    if (nla_put(nl_msg, IFLA_ADDRESS, VIR_MAC_BUFLEN, macaddress) < 0)
-        goto buffer_too_small;
-
-    if (ifname &&
-        nla_put(nl_msg, IFLA_IFNAME, strlen(ifname)+1, ifname) < 0)
-        goto buffer_too_small;
-
-    if (!(linkinfo = nla_nest_start(nl_msg, IFLA_LINKINFO)))
-        goto buffer_too_small;
-
-    if (nla_put(nl_msg, IFLA_INFO_KIND, strlen(type), type) < 0)
-        goto buffer_too_small;
-
-    if (macvlan_mode > 0) {
-        if (!(info_data = nla_nest_start(nl_msg, IFLA_INFO_DATA)))
-            goto buffer_too_small;
-
-        if (nla_put(nl_msg, IFLA_MACVLAN_MODE, sizeof(macvlan_mode),
-                    &macvlan_mode) < 0)
-            goto buffer_too_small;
-
-        nla_nest_end(nl_msg, info_data);
-    }
-
-    nla_nest_end(nl_msg, linkinfo);
-
-    if (nlComm(nl_msg, &recvbuf, &recvbuflen, 0) < 0) {
-        rc = -1;
-        goto cleanup;
-    }
-
-    if (recvbuflen < NLMSG_LENGTH(0) || recvbuf == NULL)
-        goto malformed_resp;
-
-    resp = (struct nlmsghdr *)recvbuf;
-
-    switch (resp->nlmsg_type) {
-    case NLMSG_ERROR:
-        err = (struct nlmsgerr *)NLMSG_DATA(resp);
-        if (resp->nlmsg_len < NLMSG_LENGTH(sizeof(*err)))
-            goto malformed_resp;
-
-        switch (err->error) {
-
-        case 0:
-            break;
-
-        case -EEXIST:
-            *retry = 1;
-            rc = -1;
-            break;
-
-        default:
-            virReportSystemError(-err->error,
-                                 _("error creating %s type of interface"),
-                                 type);
-            rc = -1;
-        }
-        break;
-
-    case NLMSG_DONE:
-        break;
-
-    default:
-        goto malformed_resp;
-    }
-
-cleanup:
-    nlmsg_free(nl_msg);
-
-    VIR_FREE(recvbuf);
-
-    return rc;
-
-malformed_resp:
-    nlmsg_free(nl_msg);
-
-    ifaceError(VIR_ERR_INTERNAL_ERROR, "%s",
-               _("malformed netlink response message"));
-    VIR_FREE(recvbuf);
-    return -1;
-
-buffer_too_small:
-    nlmsg_free(nl_msg);
-
-    ifaceError(VIR_ERR_INTERNAL_ERROR, "%s",
-               _("allocated netlink buffer is too small"));
-    return -1;
-}
-
-#else
-
-int virNetDevMacVLanCreate(const char *ifname ATTRIBUTE_UNUSED,
-                           const char *type ATTRIBUTE_UNUSED,
-                           const unsigned char *macaddress ATTRIBUTE_UNUSED,
-                           const char *srcdev ATTRIBUTE_UNUSED,
-                           uint32_t macvlan_mode ATTRIBUTE_UNUSED,
-                           int *retry ATTRIBUTE_UNUSED)
-{
-    ifaceError(VIR_ERR_INTERNAL_ERROR, "%s",
-# if defined(__linux__) && !WITH_MACVTAP
-               _("ifaceMacvtapLinkAdd is not supported since the include "
-                 "files were too old"));
-# else
-               _("ifaceMacvtapLinkAdd is not supported on non-linux "
-                 "platforms"));
-# endif
-
-    return -1;
-}
-
-#endif
-
-
-/**
- * virNetDevMacVLanDelete:
- *
- * @ifname: Name of the interface
- *
- * Tear down an interface with the given name.
- *
- * Returns 0 on success, -1 on fatal error.
- */
-#if defined( __linux__) && WITH_MACVTAP
-int virNetDevMacVLanDelete(const char *ifname)
-{
-    int rc = 0;
-    struct nlmsghdr *resp;
-    struct nlmsgerr *err;
-    struct ifinfomsg ifinfo = { .ifi_family = AF_UNSPEC };
-    unsigned char *recvbuf = NULL;
-    unsigned int recvbuflen;
-    struct nl_msg *nl_msg;
-
-    nl_msg = nlmsg_alloc_simple(RTM_DELLINK,
-                                NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL);
-    if (!nl_msg) {
-        virReportOOMError();
-        return -1;
-    }
-
-    if (nlmsg_append(nl_msg,  &ifinfo, sizeof(ifinfo), NLMSG_ALIGNTO) < 0)
-        goto buffer_too_small;
-
-    if (nla_put(nl_msg, IFLA_IFNAME, strlen(ifname)+1, ifname) < 0)
-        goto buffer_too_small;
-
-    if (nlComm(nl_msg, &recvbuf, &recvbuflen, 0) < 0) {
-        rc = -1;
-        goto cleanup;
-    }
-
-    if (recvbuflen < NLMSG_LENGTH(0) || recvbuf == NULL)
-        goto malformed_resp;
-
-    resp = (struct nlmsghdr *)recvbuf;
-
-    switch (resp->nlmsg_type) {
-    case NLMSG_ERROR:
-        err = (struct nlmsgerr *)NLMSG_DATA(resp);
-        if (resp->nlmsg_len < NLMSG_LENGTH(sizeof(*err)))
-            goto malformed_resp;
-
-        if (err->error) {
-            virReportSystemError(-err->error,
-                                 _("error destroying %s interface"),
-                                 ifname);
-            rc = -1;
-        }
-        break;
-
-    case NLMSG_DONE:
-        break;
-
-    default:
-        goto malformed_resp;
-    }
-
-cleanup:
-    nlmsg_free(nl_msg);
-
-    VIR_FREE(recvbuf);
-
-    return rc;
-
-malformed_resp:
-    nlmsg_free(nl_msg);
-
-    ifaceError(VIR_ERR_INTERNAL_ERROR, "%s",
-               _("malformed netlink response message"));
-    VIR_FREE(recvbuf);
-    return -1;
-
-buffer_too_small:
-    nlmsg_free(nl_msg);
-
-    ifaceError(VIR_ERR_INTERNAL_ERROR, "%s",
-               _("allocated netlink buffer is too small"));
-    return -1;
-}
-
-#else
-
-int virNetDevMacVLanDelete(const char *ifname ATTRIBUTE_UNUSED)
-{
-    ifaceError(VIR_ERR_INTERNAL_ERROR, "%s",
-# if defined(__linux__) && !WITH_MACVTAP
-               _("ifaceLinkDel is not supported since the include files "
-                 "were too old"));
-# else
-               _("ifaceLinkDel is not supported on non-linux platforms"));
-# endif
-    return -1;
-}
-
-#endif
-
 
 #if defined(__linux__) && defined(IFLA_PORT_MAX)
 
diff --git a/src/util/interface.h b/src/util/interface.h
index a62f26a..1dd8f35 100644
--- a/src/util/interface.h
+++ b/src/util/interface.h
@@ -39,18 +39,6 @@ int ifaceGetVlanID(const char *vlanifname, int *vlanid);
 
 int ifaceGetIPAddress(const char *ifname, virSocketAddrPtr addr);
 
-int virNetDevMacVLanCreate(const char *ifname,
-                           const char *type,
-                           const unsigned char *macaddress,
-                           const char *srcdev,
-                           uint32_t macvlan_mode,
-                           int *retry)
-    ATTRIBUTE_NONNULL(2) ATTRIBUTE_NONNULL(3) ATTRIBUTE_NONNULL(4)
-    ATTRIBUTE_RETURN_CHECK;
-
-int virNetDevMacVLanDelete(const char *ifname)
-    ATTRIBUTE_NONNULL(1) ATTRIBUTE_RETURN_CHECK;
-
 int ifaceMacvtapLinkDump(bool nltarget_kernel, const char *ifname, int ifindex,
                          struct nlattr **tb, unsigned char **recvbuf,
                          uint32_t (*getPidFunc)(void));
diff --git a/src/util/virnetdevmacvlan.c b/src/util/virnetdevmacvlan.c
index ab552af..6919d5e 100644
--- a/src/util/virnetdevmacvlan.c
+++ b/src/util/virnetdevmacvlan.c
@@ -34,7 +34,7 @@
 
 #define VIR_FROM_THIS VIR_FROM_NET
 
-#define macvtapError(code, ...)                                         \
+#define virNetDevError(code, ...)                                       \
     virReportErrorHelper(VIR_FROM_NET, code, __FILE__,                  \
                          __FUNCTION__, __LINE__, __VA_ARGS__)
 
@@ -74,6 +74,235 @@ VIR_ENUM_IMPL(virNetDevMacVLanMode, VIR_NETDEV_MACVLAN_MODE_LAST,
 # define MACVTAP_NAME_PATTERN	"macvtap%d"
 
 /**
+ * virNetDevMacVLanCreate:
+ *
+ * @ifname: The name the interface is supposed to have; optional parameter
+ * @type: The type of device, i.e., "macvtap"
+ * @macaddress: The MAC address of the device
+ * @srcdev: The name of the 'link' device
+ * @macvlan_mode: The macvlan mode to use
+ * @retry: Pointer to integer that will be '1' upon return if an interface
+ *         with the same name already exists and it is worth to try
+ *         again with a different name
+ *
+ * Create a macvtap device with the given properties.
+ *
+ * Returns 0 on success, -1 on fatal error.
+ */
+int
+virNetDevMacVLanCreate(const char *ifname,
+                       const char *type,
+                       const unsigned char *macaddress,
+                       const char *srcdev,
+                       uint32_t macvlan_mode,
+                       int *retry)
+{
+    int rc = 0;
+    struct nlmsghdr *resp;
+    struct nlmsgerr *err;
+    struct ifinfomsg ifinfo = { .ifi_family = AF_UNSPEC };
+    int ifindex;
+    unsigned char *recvbuf = NULL;
+    unsigned int recvbuflen;
+    struct nl_msg *nl_msg;
+    struct nlattr *linkinfo, *info_data;
+
+    if (ifaceGetIndex(true, srcdev, &ifindex) < 0)
+        return -1;
+
+    *retry = 0;
+
+    nl_msg = nlmsg_alloc_simple(RTM_NEWLINK,
+                                NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL);
+    if (!nl_msg) {
+        virReportOOMError();
+        return -1;
+    }
+
+    if (nlmsg_append(nl_msg,  &ifinfo, sizeof(ifinfo), NLMSG_ALIGNTO) < 0)
+        goto buffer_too_small;
+
+    if (nla_put_u32(nl_msg, IFLA_LINK, ifindex) < 0)
+        goto buffer_too_small;
+
+    if (nla_put(nl_msg, IFLA_ADDRESS, VIR_MAC_BUFLEN, macaddress) < 0)
+        goto buffer_too_small;
+
+    if (ifname &&
+        nla_put(nl_msg, IFLA_IFNAME, strlen(ifname)+1, ifname) < 0)
+        goto buffer_too_small;
+
+    if (!(linkinfo = nla_nest_start(nl_msg, IFLA_LINKINFO)))
+        goto buffer_too_small;
+
+    if (nla_put(nl_msg, IFLA_INFO_KIND, strlen(type), type) < 0)
+        goto buffer_too_small;
+
+    if (macvlan_mode > 0) {
+        if (!(info_data = nla_nest_start(nl_msg, IFLA_INFO_DATA)))
+            goto buffer_too_small;
+
+        if (nla_put(nl_msg, IFLA_MACVLAN_MODE, sizeof(macvlan_mode),
+                    &macvlan_mode) < 0)
+            goto buffer_too_small;
+
+        nla_nest_end(nl_msg, info_data);
+    }
+
+    nla_nest_end(nl_msg, linkinfo);
+
+    if (nlComm(nl_msg, &recvbuf, &recvbuflen, 0) < 0) {
+        rc = -1;
+        goto cleanup;
+    }
+
+    if (recvbuflen < NLMSG_LENGTH(0) || recvbuf == NULL)
+        goto malformed_resp;
+
+    resp = (struct nlmsghdr *)recvbuf;
+
+    switch (resp->nlmsg_type) {
+    case NLMSG_ERROR:
+        err = (struct nlmsgerr *)NLMSG_DATA(resp);
+        if (resp->nlmsg_len < NLMSG_LENGTH(sizeof(*err)))
+            goto malformed_resp;
+
+        switch (err->error) {
+
+        case 0:
+            break;
+
+        case -EEXIST:
+            *retry = 1;
+            rc = -1;
+            break;
+
+        default:
+            virReportSystemError(-err->error,
+                                 _("error creating %s type of interface"),
+                                 type);
+            rc = -1;
+        }
+        break;
+
+    case NLMSG_DONE:
+        break;
+
+    default:
+        goto malformed_resp;
+    }
+
+cleanup:
+    nlmsg_free(nl_msg);
+
+    VIR_FREE(recvbuf);
+
+    return rc;
+
+malformed_resp:
+    nlmsg_free(nl_msg);
+
+    virNetDevError(VIR_ERR_INTERNAL_ERROR, "%s",
+                   _("malformed netlink response message"));
+    VIR_FREE(recvbuf);
+    return -1;
+
+buffer_too_small:
+    nlmsg_free(nl_msg);
+
+    virNetDevError(VIR_ERR_INTERNAL_ERROR, "%s",
+                   _("allocated netlink buffer is too small"));
+    return -1;
+}
+
+/**
+ * virNetDevMacVLanDelete:
+ *
+ * @ifname: Name of the interface
+ *
+ * Tear down an interface with the given name.
+ *
+ * Returns 0 on success, -1 on fatal error.
+ */
+int virNetDevMacVLanDelete(const char *ifname)
+{
+    int rc = 0;
+    struct nlmsghdr *resp;
+    struct nlmsgerr *err;
+    struct ifinfomsg ifinfo = { .ifi_family = AF_UNSPEC };
+    unsigned char *recvbuf = NULL;
+    unsigned int recvbuflen;
+    struct nl_msg *nl_msg;
+
+    nl_msg = nlmsg_alloc_simple(RTM_DELLINK,
+                                NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL);
+    if (!nl_msg) {
+        virReportOOMError();
+        return -1;
+    }
+
+    if (nlmsg_append(nl_msg,  &ifinfo, sizeof(ifinfo), NLMSG_ALIGNTO) < 0)
+        goto buffer_too_small;
+
+    if (nla_put(nl_msg, IFLA_IFNAME, strlen(ifname)+1, ifname) < 0)
+        goto buffer_too_small;
+
+    if (nlComm(nl_msg, &recvbuf, &recvbuflen, 0) < 0) {
+        rc = -1;
+        goto cleanup;
+    }
+
+    if (recvbuflen < NLMSG_LENGTH(0) || recvbuf == NULL)
+        goto malformed_resp;
+
+    resp = (struct nlmsghdr *)recvbuf;
+
+    switch (resp->nlmsg_type) {
+    case NLMSG_ERROR:
+        err = (struct nlmsgerr *)NLMSG_DATA(resp);
+        if (resp->nlmsg_len < NLMSG_LENGTH(sizeof(*err)))
+            goto malformed_resp;
+
+        if (err->error) {
+            virReportSystemError(-err->error,
+                                 _("error destroying %s interface"),
+                                 ifname);
+            rc = -1;
+        }
+        break;
+
+    case NLMSG_DONE:
+        break;
+
+    default:
+        goto malformed_resp;
+    }
+
+cleanup:
+    nlmsg_free(nl_msg);
+
+    VIR_FREE(recvbuf);
+
+    return rc;
+
+malformed_resp:
+    nlmsg_free(nl_msg);
+
+    virNetDevError(VIR_ERR_INTERNAL_ERROR, "%s",
+                   _("malformed netlink response message"));
+    VIR_FREE(recvbuf);
+    return -1;
+
+buffer_too_small:
+    nlmsg_free(nl_msg);
+
+    virNetDevError(VIR_ERR_INTERNAL_ERROR, "%s",
+                   _("allocated netlink buffer is too small"));
+    return -1;
+}
+
+
+/**
  * virNetDevMacVLanTapOpen:
  * Open the macvtap's tap device.
  * @ifname: Name of the macvtap interface
@@ -332,9 +561,9 @@ create_name:
         goto disassociate_exit;
 
     if (virNetDevBandwidthSet(cr_ifname, bandwidth) < 0) {
-        macvtapError(VIR_ERR_INTERNAL_ERROR,
-                     _("cannot set bandwidth limits on %s"),
-                     cr_ifname);
+        virNetDevError(VIR_ERR_INTERNAL_ERROR,
+                       _("cannot set bandwidth limits on %s"),
+                       cr_ifname);
         rc = -1;
         goto disassociate_exit;
     }
@@ -392,6 +621,25 @@ int virNetDevMacVLanDeleteWithVPortProfile(const char *ifname,
 }
 
 #else /* ! WITH_MACVTAP */
+int virNetDevMacVLanCreate(const char *ifname ATTRIBUTE_UNUSED,
+                           const char *type ATTRIBUTE_UNUSED,
+                           const unsigned char *macaddress ATTRIBUTE_UNUSED,
+                           const char *srcdev ATTRIBUTE_UNUSED,
+                           uint32_t macvlan_mode ATTRIBUTE_UNUSED,
+                           int *retry ATTRIBUTE_UNUSED)
+{
+    virReportSystemError(ENOSYS, "%s",
+                         _("Cannot create macvlan devices on this platform"));
+    return -1;
+}
+
+int virNetDevMacVLanDelete(const char *ifname ATTRIBUTE_UNUSED)
+{
+    virReportSystemError(ENOSYS, "%s",
+                         _("Cannot create macvlan devices on this platform"));
+    return -1;
+}
+
 int virNetDevMacVLanCreateWithVPortProfile(const char *ifname ATTRIBUTE_UNUSED,
                                            const unsigned char *macaddress ATTRIBUTE_UNUSED,
                                            const char *linkdev ATTRIBUTE_UNUSED,
diff --git a/src/util/virnetdevmacvlan.h b/src/util/virnetdevmacvlan.h
index 9498f7b..73918b8 100644
--- a/src/util/virnetdevmacvlan.h
+++ b/src/util/virnetdevmacvlan.h
@@ -39,6 +39,18 @@ enum virNetDevMacVLanMode {
 };
 VIR_ENUM_DECL(virNetDevMacVLanMode)
 
+int virNetDevMacVLanCreate(const char *ifname,
+                           const char *type,
+                           const unsigned char *macaddress,
+                           const char *srcdev,
+                           uint32_t macvlan_mode,
+                           int *retry)
+    ATTRIBUTE_NONNULL(2) ATTRIBUTE_NONNULL(3) ATTRIBUTE_NONNULL(4)
+    ATTRIBUTE_RETURN_CHECK;
+
+int virNetDevMacVLanDelete(const char *ifname)
+    ATTRIBUTE_NONNULL(1) ATTRIBUTE_RETURN_CHECK;
+
 int virNetDevMacVLanCreateWithVPortProfile(const char *ifname,
                                            const unsigned char *macaddress,
                                            const char *linkdev,
-- 
1.7.6.4


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