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qga/linux: Add new api 'guest-network-get-route'

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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>
This commit is contained in:
Dehan Meng 2024-06-13 17:28:02 +08:00 • committed by Konstantin Kostiuk
parent ce22616181
commit 8e326d36dd
2 changed files with 206 additions and 0 deletions
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133
qga/commands-linux.c
View file

@ -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 @@ GuestCpuStatsList *qmp_guest_get_cpustats(Error **errp)
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;
}