util: use netlink to create bridge devices

Just as it is possible to delete a bridge device with the netlink
RTM_DELLINK message, one can be created with the RTM_NEWLINK
message. Because of differences in the format of the message, it's not
as straightforward as with virNetlinkDelLink() to create a single
utility function that can be used to create any type of interface, so
the new netlink version of virNetDevBridgeCreate() does its own
construction of the netlink message and calls virNetlinkCommand()
itself.

This doesn't provide any extra functionality, just provides symmetry
with the previous commit.

NB: We *could* alter the API of virNetDevBridgeCreate() to take a MAC
address, and directly program that mac address into the bridge (by
adding an IFLA_ADDRESS attribute, as is done in
virNetDevMacVLanCreate()) rather than separately creating the "dummy
tap" (e.g. virbr0-nic) to maintain a fixed mac address on the bridge,
but the commit history of virnetdevbridge.c shows that the presence of
this dummy tap is essential in some older versions of the kernel
(between 2.6.39 and 3.1 or 3.2, possibly?) to proper operation of IPv6
DAD, and I don't want to take the chance of breaking something that I
don't have the time/setup to test (my RHEL6 box is at kernel
2.6.32-544, and the next lowest kernel I have is 3.17)

src/util/virnetdevbridge.c

@@ -395,7 +395,83 @@ virNetDevBridgePortSetUnicastFlood(const char *brname ATTRIBUTE_UNUSED,
  *
  * Returns 0 in case of success or -1 on failure
  */
-#if defined(HAVE_STRUCT_IFREQ) && defined(SIOCBRADDBR)
+#if defined(__linux__) && defined(HAVE_LIBNL)
+int virNetDevBridgeCreate(const char *brname)
+{
+    /* use a netlink RTM_NEWLINK message to create the bridge */
+    const char *type = "bridge";
+    int rc = -1;
+    struct nlmsghdr *resp = NULL;
+    struct nlmsgerr *err;
+    struct ifinfomsg ifinfo = { .ifi_family = AF_UNSPEC };
+    unsigned int recvbuflen;
+    struct nl_msg *nl_msg;
+    struct nlattr *linkinfo;
+
+    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(nl_msg, IFLA_IFNAME, strlen(brname)+1, brname) < 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;
+    nla_nest_end(nl_msg, linkinfo);
+
+    if (virNetlinkCommand(nl_msg, &resp, &recvbuflen, 0, 0,
+                          NETLINK_ROUTE, 0) < 0) {
+        goto cleanup;
+    }
+
+    if (recvbuflen < NLMSG_LENGTH(0) || resp == NULL)
+        goto malformed_resp;
+
+    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;
+        default:
+            virReportSystemError(-err->error,
+                                 _("error creating bridge interface %s"),
+                                 brname);
+            goto cleanup;
+        }
+        break;
+
+    case NLMSG_DONE:
+        break;
+    default:
+        goto malformed_resp;
+    }
+
+    rc = 0;
+ cleanup:
+    nlmsg_free(nl_msg);
+    VIR_FREE(resp);
+    return rc;
+
+ malformed_resp:
+    virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+                   _("malformed netlink response message"));
+    goto cleanup;
+ buffer_too_small:
+    virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+                   _("allocated netlink buffer is too small"));
+    goto cleanup;
+}
+#elif defined(HAVE_STRUCT_IFREQ) && defined(SIOCBRADDBR)
 int virNetDevBridgeCreate(const char *brname)
 {
     int fd = -1;