qga/linux: Add new api 'guest-network-get-route'
The Route information of the Linux VM needs to be used
by administrators and users when debugging network problems
and troubleshooting.
Signed-off-by: Dehan Meng <demeng@redhat.com>
Reviewed-by: Konstantin Kostiuk <kkostiuk@redhat.com>
Message-ID: <20240613092802.346246-2-demeng@redhat.com>
Signed-off-by: Konstantin Kostiuk <kkostiuk@redhat.com>
diff --git a/qga/commands-linux.c b/qga/commands-linux.c
index 89bdcde..51d5e3d 100644
--- a/qga/commands-linux.c
+++ b/qga/commands-linux.c
@@ -28,6 +28,10 @@
#include <libudev.h>
#endif
+#ifdef HAVE_GETIFADDRS
+#include <net/if.h>
+#endif
+
#include <sys/statvfs.h>
#if defined(CONFIG_FSFREEZE) || defined(CONFIG_FSTRIM)
@@ -2089,3 +2093,132 @@
fclose(fp);
return head;
}
+
+static char *hexToIPAddress(const void *hexValue, int is_ipv6)
+{
+ if (is_ipv6) {
+ char addr[INET6_ADDRSTRLEN];
+ struct in6_addr in6;
+ const char *hexStr = (const char *)hexValue;
+ int i;
+
+ for (i = 0; i < 16; i++) {
+ sscanf(&hexStr[i * 2], "%02hhx", &in6.s6_addr[i]);
+ }
+ inet_ntop(AF_INET6, &in6, addr, INET6_ADDRSTRLEN);
+
+ return g_strdup(addr);
+ } else {
+ unsigned int hexInt = *(unsigned int *)hexValue;
+ unsigned int byte1 = (hexInt >> 24) & 0xFF;
+ unsigned int byte2 = (hexInt >> 16) & 0xFF;
+ unsigned int byte3 = (hexInt >> 8) & 0xFF;
+ unsigned int byte4 = hexInt & 0xFF;
+
+ return g_strdup_printf("%u.%u.%u.%u", byte4, byte3, byte2, byte1);
+ }
+}
+
+GuestNetworkRouteList *qmp_guest_network_get_route(Error **errp)
+{
+ GuestNetworkRouteList *head = NULL, **tail = &head;
+ const char *routeFiles[] = {"/proc/net/route", "/proc/net/ipv6_route"};
+ FILE *fp;
+ size_t n;
+ char *line = NULL;
+ int firstLine;
+ int is_ipv6;
+ int i;
+
+ for (i = 0; i < 2; i++) {
+ firstLine = 1;
+ is_ipv6 = (i == 1);
+ fp = fopen(routeFiles[i], "r");
+ if (fp == NULL) {
+ error_setg_errno(errp, errno, "open(\"%s\")", routeFiles[i]);
+ free(line);
+ continue;
+ }
+
+ while (getline(&line, &n, fp) != -1) {
+ if (firstLine && !is_ipv6) {
+ firstLine = 0;
+ continue;
+ }
+ GuestNetworkRoute *route = NULL;
+ GuestNetworkRoute *networkroute;
+ char Iface[IFNAMSIZ];
+ if (is_ipv6) {
+ char Destination[33], Source[33], NextHop[33];
+ int DesPrefixlen, SrcPrefixlen, Metric, RefCnt, Use, Flags;
+
+ /* Parse the line and extract the values */
+ if (sscanf(line, "%32s %x %32s %x %32s %x %x %x %x %s",
+ Destination, &DesPrefixlen, Source,
+ &SrcPrefixlen, NextHop, &Metric, &RefCnt,
+ &Use, &Flags, Iface) != 10) {
+ continue;
+ }
+
+ route = g_new0(GuestNetworkRoute, 1);
+ networkroute = route;
+ networkroute->iface = g_strdup(Iface);
+ networkroute->destination = hexToIPAddress(Destination, 1);
+ networkroute->metric = Metric;
+ networkroute->source = hexToIPAddress(Source, 1);
+ networkroute->desprefixlen = g_strdup_printf(
+ "%d", DesPrefixlen
+ );
+ networkroute->srcprefixlen = g_strdup_printf(
+ "%d", SrcPrefixlen
+ );
+ networkroute->nexthop = hexToIPAddress(NextHop, 1);
+ networkroute->has_flags = true;
+ networkroute->flags = Flags;
+ networkroute->has_refcnt = true;
+ networkroute->refcnt = RefCnt;
+ networkroute->has_use = true;
+ networkroute->use = Use;
+ networkroute->version = 6;
+ } else {
+ unsigned int Destination, Gateway, Mask, Flags;
+ int RefCnt, Use, Metric, MTU, Window, IRTT;
+
+ /* Parse the line and extract the values */
+ if (sscanf(line, "%s %X %X %x %d %d %d %X %d %d %d",
+ Iface, &Destination, &Gateway, &Flags, &RefCnt,
+ &Use, &Metric, &Mask, &MTU, &Window, &IRTT) != 11) {
+ continue;
+ }
+
+ route = g_new0(GuestNetworkRoute, 1);
+ networkroute = route;
+ networkroute->iface = g_strdup(Iface);
+ networkroute->destination = hexToIPAddress(&Destination, 0);
+ networkroute->gateway = hexToIPAddress(&Gateway, 0);
+ networkroute->mask = hexToIPAddress(&Mask, 0);
+ networkroute->metric = Metric;
+ networkroute->has_flags = true;
+ networkroute->flags = Flags;
+ networkroute->has_refcnt = true;
+ networkroute->refcnt = RefCnt;
+ networkroute->has_use = true;
+ networkroute->use = Use;
+ networkroute->has_mtu = true;
+ networkroute->mtu = MTU;
+ networkroute->has_window = true;
+ networkroute->window = Window;
+ networkroute->has_irtt = true;
+ networkroute->irtt = IRTT;
+ networkroute->version = 4;
+ }
+
+ QAPI_LIST_APPEND(tail, route);
+ }
+
+ free(line);
+ fclose(fp);
+ }
+
+ return head;
+}
diff --git a/qga/qapi-schema.json b/qga/qapi-schema.json
index c763163..495706c 100644
--- a/qga/qapi-schema.json
+++ b/qga/qapi-schema.json
@@ -1851,3 +1851,76 @@
'returns': ['GuestCpuStats'],
'if': 'CONFIG_LINUX'
}
+
+##
+# @GuestNetworkRoute:
+#
+# Route information, currently, only linux supported.
+#
+# @iface: The destination network or host's egress network interface in the routing table
+#
+# @destination: The IP address of the target network or host, The final destination of the packet
+#
+# @metric: Route metric
+#
+# @gateway: The IP address of the next hop router
+#
+# @mask: Subnet Mask (IPv4 only)
+#
+# @irtt: Initial round-trip delay (not for windows, IPv4 only)
+#
+# @flags: Route flags (not for windows)
+#
+# @refcnt: The route's reference count (not for windows)
+#
+# @use: Route usage count (not for windows)
+#
+# @window: TCP window size, used for flow control (not for windows, IPv4 only)
+#
+# @mtu: Data link layer maximum packet size (not for windows)
+#
+# @desprefixlen: Destination prefix length (for IPv6)
+#
+# @source: Source IP address (for IPv6)
+#
+# @srcprefixlen: Source prefix length (for IPv6)
+#
+# @nexthop: Next hop IP address (for IPv6)
+#
+# @version: IP version (4 or 6)
+#
+# Since: 9.1
+
+##
+{ 'struct': 'GuestNetworkRoute',
+ 'data': {'iface': 'str',
+ 'destination': 'str',
+ 'metric': 'int',
+ '*gateway': 'str',
+ '*mask': 'str',
+ '*irtt': 'int',
+ '*flags': 'uint64',
+ '*refcnt': 'int',
+ '*use': 'int',
+ '*window': 'int',
+ '*mtu': 'int',
+ '*desprefixlen': 'str',
+ '*source': 'str',
+ '*srcprefixlen': 'str',
+ '*nexthop': 'str',
+ 'version': 'int'
+ },
+ 'if': 'CONFIG_LINUX' }
+
+##
+# @guest-network-get-route:
+#
+# Retrieve information about route of network.
+# Returns: List of route info of guest.
+#
+# Since: 9.1
+##
+{ 'command': 'guest-network-get-route',
+ 'returns': ['GuestNetworkRoute'],
+ 'if': 'CONFIG_LINUX'
+}
