ipvs plugin: Check for correct IPVS version in cipvs_init().

I took over the required minimum version (1.1.4) as used in ipvsadm 1.24
for Linux kernels >= 2.6.

Signed-off-by: Sebastian Harl <sh@tokkee.org>
Signed-off-by: Florian Forster <octo@huhu.verplant.org>

diff --git a/src/ipvs.c b/src/ipvs.c
index 9bf2224..4c63058 100644 (file)
--- a/src/ipvs.c
+++ b/src/ipvs.c
@@ -52,6 +52,7 @@
 #endif /* HAVE_IP_VS_H */
 
 #define log_err(...) ERROR ("ipvs: " __VA_ARGS__)
+#define log_info(...) INFO ("ipvs: " __VA_ARGS__)
 
 
 /*
@@ -140,12 +141,39 @@ static struct ip_vs_get_dests *ipvs_get_dests (struct ip_vs_service_entry *se)
 
 static int cipvs_init (void)
 {
+       struct ip_vs_getinfo ipvs_info;
+
+       socklen_t len;
+
        if (-1 == (sockfd = socket (AF_INET, SOCK_RAW, IPPROTO_RAW))) {
                char errbuf[1024];
                log_err ("cipvs_init: socket() failed: %s",
                                sstrerror (errno, errbuf, sizeof (errbuf)));
                return -1;
        }
+
+       len = sizeof (ipvs_info);
+
+       if (0 != getsockopt (sockfd, IPPROTO_IP, IP_VS_SO_GET_INFO,
+                               (void *)&ipvs_info, &len)) {
+               char errbuf[1024];
+               log_err ("cipvs_init: getsockopt() failed: %s",
+                               sstrerror (errno, errbuf, sizeof (errbuf)));
+               close (sockfd);
+               return -1;
+       }
+
+       /* we need IPVS >= 1.1.4 */
+       if (ipvs_info.version < ((1 << 16) + (1 << 8) + 4)) {
+               log_err ("cipvs_init: IPVS version too old (%d.%d.%d < %d.%d.%d)",
+                               NVERSION (ipvs_info.version), 1, 1, 4);
+               close (sockfd);
+               return -1;
+       }
+       else {
+               log_info ("Successfully connected to IPVS %d.%d.%d",
+                               NVERSION (ipvs_info.version));
+       }
        return 0;
 } /* cipvs_init */