dlm: fix address compare

Compare only the addr and port fields of sockaddr structures.
Fixes a problem with ipv6 where sin6_scope_id does not match.

Signed-off-by: David Teigland <teigland@redhat.com>

1 files changed, 31 insertions, 2 deletions

diff --git a/fs/dlm/config.c b/fs/dlm/config.c
index 89d2fb7b991a..1359be3b0bb6 100644
--- a/fs/dlm/config.c
+++ b/fs/dlm/config.c
@@ -14,6 +14,9 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/configfs.h>
+#include <linux/in.h>
+#include <linux/in6.h>
+#include <net/ipv6.h>
 #include <net/sock.h>
 
 #include "config.h"
@@ -776,6 +779,33 @@ static void put_space(struct dlm_space *sp)
         config_item_put(&sp->group.cg_item);
 }
 
+static int addr_compare(struct sockaddr_storage *x, struct sockaddr_storage *y)
+{
+        switch (x->ss_family) {
+        case AF_INET: {
+                struct sockaddr_in *sinx = (struct sockaddr_in *)x;
+                struct sockaddr_in *siny = (struct sockaddr_in *)y;
+                if (sinx->sin_addr.s_addr != siny->sin_addr.s_addr)
+                        return 0;
+                if (sinx->sin_port != siny->sin_port)
+                        return 0;
+                break;
+        }
+        case AF_INET6: {
+                struct sockaddr_in6 *sinx = (struct sockaddr_in6 *)x;
+                struct sockaddr_in6 *siny = (struct sockaddr_in6 *)y;
+                if (!ipv6_addr_equal(&sinx->sin6_addr, &siny->sin6_addr))
+                        return 0;
+                if (sinx->sin6_port != siny->sin6_port)
+                        return 0;
+                break;
+        }
+        default:
+                return 0;
+        }
+        return 1;
+}
+
 static struct dlm_comm *get_comm(int nodeid, struct sockaddr_storage *addr)
 {
         struct config_item *i;
@@ -797,8 +827,7 @@ static struct dlm_comm *get_comm(int nodeid, struct sockaddr_storage *addr)
                         config_item_get(i);
                         break;
                 } else {
-                        if (!cm->addr_count ||
-                            memcmp(cm->addr[0], addr, sizeof(*addr)))
+                        if (!cm->addr_count || !addr_compare(cm->addr[0], addr))
                                 continue;
                         found = 1;
                         config_item_get(i);