[CRIU] [PATCH v2 6/8] workaround "mc_forwarding" is not writable

[Pavel Tikhomirov]

Signed-off-by: Pavel Tikhomirov <ptikhomirov at parallels.com>
---
 net.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/net.c b/net.c
index cab7920..8b923d0 100644
--- a/net.c
+++ b/net.c
@@ -97,6 +97,22 @@ static int ipv4_conf_op(char *dir, int *conf, int op)
 		req[0].type = CTL_32;
 		req[1].name = NULL;
 
+		if (strcmp("mc_forwarding", devconfs[i]) == 0 && op == CTL_WRITE) {
+			int tmp;
+
+			req[0].arg = &tmp;
+			ret = sysctl_op(req, CTL_READ);
+			if (ret < 0) {
+				pr_err("Failed to read %s/%s\n", dir, devconfs[i]);
+				return -1;
+			}
+
+			if (tmp != conf[i]) {
+				pr_err("Can not set %s\n", path);
+				return -1;
+			}
+			continue;
+		}
 		ret = sysctl_op(req, op);
 		if (ret < 0) {
 			pr_err("Failed to read %s/%s\n", dir, devconfs[i]);
-- 
1.9.3