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[libvirt] [PATCH] more interface functions; some needed for VEPA



In the attached patch I am refactoring the function that changes the
flags on an interface to call a separate function to first read the
flags on the interface. This function that reads the flags then becomes
public.
I am also adding a function that test whether an interface is currently
up. This prevents other code to have to include interface related
include files.
Then there is a new function that reads the VLANid of a VLAN interface
via an ioctl(). This one will be needed by upcoming VEPA related
patches.

On cygwin for example none of the newly added functions are available.
The flags related function could not be exported due to missing
PF_PACKET -- or maybe other type of protocol that needs to be used when
opening the socket for running the ioctl() on.

Signed-off-by: Stefan Berger <stefanb us ibm com>

---
 src/libvirt_private.syms |    2 +
 src/util/interface.c     |   76 ++++++++++++++++++++++++++++++++++++++++-------
 src/util/interface.h     |    3 +
 3 files changed, 70 insertions(+), 11 deletions(-)

Index: libvirt-acl/src/util/interface.c
===================================================================
--- libvirt-acl.orig/src/util/interface.c
+++ libvirt-acl/src/util/interface.c
@@ -30,6 +30,8 @@
 
 #ifdef __linux__
 # include <linux/if.h>
+# include <linux/sockios.h>
+# include <linux/if_vlan.h>
 #endif
 
 #include "internal.h"
@@ -42,6 +44,85 @@
         virReportErrorHelper(NULL, VIR_FROM_NET, code, __FILE__, \
                              __FUNCTION__, __LINE__, __VA_ARGS__)
 
+#if __linux__
+static int
+getFlags(int fd, const char *ifname, struct ifreq *ifr) {
+
+    memset(ifr, 0, sizeof(*ifr));
+
+    if (virStrncpy(ifr->ifr_name,
+                   ifname, strlen(ifname), sizeof(ifr->ifr_name)) == NULL)
+        return ENODEV;
+
+    if (ioctl(fd, SIOCGIFFLAGS, ifr) < 0)
+        return errno;
+
+    return 0;
+}
+
+
+/**
+ * ifaceGetFlags
+ *
+ * @ifname : name of the interface
+ * @flags : pointer to short holding the flags on success
+ *
+ * Get the flags of the interface. Returns 0 on success, error code on failure.
+ */
+int
+ifaceGetFlags(const char *ifname, short *flags) {
+    struct ifreq ifr;
+    int rc;
+    int fd = socket(PF_PACKET, SOCK_DGRAM, 0);
+
+    if (fd < 0)
+        return errno;
+
+    rc = getFlags(fd, ifname, &ifr);
+
+    *flags = ifr.ifr_flags;
+
+    close(fd);
+
+    return rc;
+}
+
+
+int
+ifaceIsUp(const char *ifname, bool *up) {
+    short flags;
+    int rc = ifaceGetFlags(ifname, &flags);
+
+    if (rc)
+        return rc;
+
+    *up = ((flags & IFF_UP) == IFF_UP);
+
+    return 0;
+}
+#else
+
+/* Note: Showstopper on cygwin is only missing PF_PACKET */
+
+int
+ifaceGetFlags(const char *ifname ATTRIBUTE_UNUSED,
+              short *flags ATTRIBUTE_UNUSED) {
+    ifaceError(VIR_ERR_INTERNAL_ERROR, "%s",
+               _("ifaceGetFlags is not supported on non-linux platforms"));
+    return ENOSYS;
+}
+
+int
+ifaceIsUp(const char *ifname ATTRIBUTE_UNUSED,
+          bool *up ATTRIBUTE_UNUSED) {
+
+    ifaceError(VIR_ERR_INTERNAL_ERROR, "%s",
+               _("ifaceIsUp is not supported on non-linux platforms"));
+    return ENOSYS;
+}
+
+#endif /* __linux__ */
+
 /*
  * chgIfaceFlags: Change flags on an interface
  *
@@ -59,23 +140,16 @@
 static int chgIfaceFlags(const char *ifname, short flagclear, short flagset) {
     struct ifreq ifr;
     int rc = 0;
-    int flags;
+    short flags;
     short flagmask = (~0 ^ flagclear);
     int fd = socket(PF_PACKET, SOCK_DGRAM, 0);
 
     if (fd < 0)
         return errno;
 
-    if (virStrncpy(ifr.ifr_name,
-                   ifname, strlen(ifname), sizeof(ifr.ifr_name)) == NULL) {
-        rc = ENODEV;
+    rc = getFlags(fd, ifname, &ifr);
+    if (rc != 0)
         goto err_exit;
-    }
-
-    if (ioctl(fd, SIOCGIFFLAGS, &ifr) < 0) {
-        rc = errno;
-        goto err_exit;
-    }
 
     flags = (ifr.ifr_flags & flagmask) | flagset;
 
@@ -151,6 +225,8 @@ ifaceCheck(bool reportError, const char 
         if (fd < 0)
             return errno;
 
+        memset(&ifr, 0, sizeof(ifr));
+
         if (virStrncpy(ifr.ifr_name,
                        ifname, strlen(ifname), sizeof(ifr.ifr_name)) == NULL) {
             if (reportError)
@@ -227,6 +303,8 @@ ifaceGetIndex(bool reportError, const ch
     if (fd < 0)
         return errno;
 
+    memset(&ifreq, 0, sizeof(ifreq));
+
     if (virStrncpy(ifreq.ifr_name, ifname, strlen(ifname),
                    sizeof(ifreq.ifr_name)) == NULL) {
         if (reportError)
@@ -269,3 +347,46 @@ ifaceGetIndex(bool reportError,
 }
 
 #endif /* __linux__ */
+
+#ifdef __linux__
+int
+ifaceGetVlanID(const char *vlanifname, int *vlanid) {
+    struct vlan_ioctl_args vlanargs = {
+      .cmd = GET_VLAN_VID_CMD,
+    };
+    int rc = 0;
+    int fd = socket(PF_PACKET, SOCK_DGRAM, 0);
+
+    if (fd < 0)
+        return errno;
+
+    if (virStrcpyStatic(vlanargs.device1, vlanifname) == NULL) {
+        rc = EINVAL;
+        goto err_exit;
+    }
+
+    if (ioctl(fd, SIOCGIFVLAN, &vlanargs) != 0) {
+        rc = errno;
+        goto err_exit;
+    }
+
+    *vlanid = vlanargs.u.VID;
+
+ err_exit:
+    close(fd);
+
+    return rc;
+}
+
+#else
+
+int
+ifaceGetVlanID(const char *vlanifname ATTRIBUTE_UNUSED,
+               int *vlanid ATTRIBUTE_UNUSED) {
+
+    ifaceError(VIR_ERR_INTERNAL_ERROR, "%s",
+               _("ifaceGetVlanID is not supported on non-linux platforms"));
+
+    return ENOSYS;
+}
+#endif /* __linux__ */
Index: libvirt-acl/src/util/interface.h
===================================================================
--- libvirt-acl.orig/src/util/interface.h
+++ libvirt-acl/src/util/interface.h
@@ -12,6 +12,9 @@
 
 # include "datatypes.h"
 
+int ifaceGetFlags(const char *name, short *flags);
+int ifaceIsUp(const char *name, bool *up);
+
 int ifaceCtrl(const char *name, bool up);
 
 static inline int ifaceUp(const char *name) {
@@ -27,4 +30,6 @@ int ifaceCheck(bool reportError, const c
 
 int ifaceGetIndex(bool reportError, const char *ifname, int *ifindex);
 
+int ifaceGetVlanID(const char *vlanifname, int *vlanid);
+
 #endif /* __VIR_INTERFACE_H__ */
Index: libvirt-acl/src/libvirt_private.syms
===================================================================
--- libvirt-acl.orig/src/libvirt_private.syms
+++ libvirt-acl/src/libvirt_private.syms
@@ -685,6 +685,9 @@ virArgvToString;
 ifaceCtrl;
 ifaceCheck;
 ifaceGetIndex;
+ifaceGetFlags;
+ifaceIsUp;
+ifaceGetVlanID;
 
 # usb.h
 usbGetDevice;


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