Tools: hv: Gather ipv[4,6] gateway information

Gather information on the default gateways - ipv4/ipv6.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 68 insertions, 0 deletions

diff --git a/tools/hv/hv_kvp_daemon.c b/tools/hv/hv_kvp_daemon.c
index a63e83a0159f..65d54c89394e 100644
--- a/tools/hv/hv_kvp_daemon.c
+++ b/tools/hv/hv_kvp_daemon.c
@@ -491,6 +491,68 @@ done:
         return;
 }
 
+static void kvp_process_ipconfig_file(char *cmd,
+                                        char *config_buf, int len,
+                                        int element_size, int offset)
+{
+        char buf[256];
+        char *p;
+        char *x;
+        FILE *file;
+
+        /*
+         * First execute the command.
+         */
+        file = popen(cmd, "r");
+        if (file == NULL)
+                return;
+
+        if (offset == 0)
+                memset(config_buf, 0, len);
+        while ((p = fgets(buf, sizeof(buf), file)) != NULL) {
+                if ((len - strlen(config_buf)) < (element_size + 1))
+                        break;
+
+                x = strchr(p, '\n');
+                *x = '\0';
+                strcat(config_buf, p);
+                strcat(config_buf, ";");
+        }
+        pclose(file);
+}
+
+static void kvp_get_ipconfig_info(char *if_name,
+                                 struct hv_kvp_ipaddr_value *buffer)
+{
+        char cmd[512];
+
+        /*
+         * Get the address of default gateway (ipv4).
+         */
+        sprintf(cmd, "%s %s", "ip route show dev", if_name);
+        strcat(cmd, " | awk '/default/ {print $3 }'");
+
+        /*
+         * Execute the command to gather gateway info.
+         */
+        kvp_process_ipconfig_file(cmd, (char *)buffer->gate_way,
+                                (MAX_GATEWAY_SIZE * 2), INET_ADDRSTRLEN, 0);
+
+        /*
+         * Get the address of default gateway (ipv6).
+         */
+        sprintf(cmd, "%s %s", "ip -f inet6  route show dev", if_name);
+        strcat(cmd, " | awk '/default/ {print $3 }'");
+
+        /*
+         * Execute the command to gather gateway info (ipv6).
+         */
+        kvp_process_ipconfig_file(cmd, (char *)buffer->gate_way,
+                                (MAX_GATEWAY_SIZE * 2), INET6_ADDRSTRLEN, 1);
+
+}
+
+
 static unsigned int hweight32(unsigned int *w)
 {
         unsigned int res = *w - ((*w >> 1) & 0x55555555);
@@ -650,6 +712,12 @@ kvp_get_ip_address(int family, char *if_name, int op,
                                 strcat((char *)ip_buffer->sub_net, ";");
                                 sn_offset += strlen(sn_str) + 1;
                         }
+
+                        /*
+                         * Collect other ip related configuration info.
+                         */
+
+                        kvp_get_ipconfig_info(if_name, ip_buffer);
                 }
 
 gather_ipaddr: