Reviewed-by: Konstantin Kostiuk <kkost...@redhat.com>
On Thu, Jun 13, 2024 at 12:28 PM Dehan Meng <dem...@redhat.com> wrote:
> 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 <dem...@redhat.com>
> ---
> qga/commands-posix.c | 135 +++++++++++++++++++++++++++++++++++++++++++
> qga/commands-win32.c | 6 ++
> qga/qapi-schema.json | 71 +++++++++++++++++++++++
> 3 files changed, 212 insertions(+)
>
> diff --git a/qga/commands-posix.c b/qga/commands-posix.c
> index 7f05996495..b85b3937bf 100644
> --- a/qga/commands-posix.c
> +++ b/qga/commands-posix.c
> @@ -2708,6 +2708,135 @@ GuestCpuStatsList *qmp_guest_get_cpustats(Error
> **errp)
> 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 %32s",
> + 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;
> +}
> +
> #else /* defined(__linux__) */
>
> void qmp_guest_suspend_disk(Error **errp)
> @@ -3079,6 +3208,12 @@ GuestCpuStatsList *qmp_guest_get_cpustats(Error
> **errp)
> return NULL;
> }
>
> +GuestNetworkRouteList *qmp_guest_network_get_route(Error **errp)
> +{
> + error_setg(errp, QERR_UNSUPPORTED);
> + return NULL;
> +}
> +
> #endif /* CONFIG_FSFREEZE */
>
> #if !defined(CONFIG_FSTRIM)
> diff --git a/qga/commands-win32.c b/qga/commands-win32.c
> index 0d1b836e87..91289bc9ab 100644
> --- a/qga/commands-win32.c
> +++ b/qga/commands-win32.c
> @@ -2517,3 +2517,9 @@ GuestCpuStatsList *qmp_guest_get_cpustats(Error
> **errp)
> error_setg(errp, QERR_UNSUPPORTED);
> return NULL;
> }
> +
> +GuestNetworkRouteList *qmp_guest_network_get_route(Error **errp)
> +{
> + error_setg(errp, QERR_UNSUPPORTED);
> + return NULL;
> +}
> diff --git a/qga/qapi-schema.json b/qga/qapi-schema.json
> index b3de1fb6b3..1c2ee9f3c6 100644
> --- a/qga/qapi-schema.json
> +++ b/qga/qapi-schema.json
> @@ -1800,3 +1800,74 @@
> { 'command': 'guest-get-cpustats',
> 'returns': ['GuestCpuStats']
> }
> +
> +##
> +# @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'
> + }}
> +
> +##
> +# @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']
> +}
> --
> 2.40.1
>
>
