+static int system_get_sysctl(const char *path, char *buf, const size_t buf_sz)
+{
+ int fd = -1, ret = -1;
+
+ fd = open(path, O_RDONLY);
+ if (fd < 0)
+ goto out;
+
+ ssize_t len = read(fd, buf, buf_sz - 1);
+ if (len < 0)
+ goto out;
+
+ ret = buf[len] = 0;
+
+out:
+ if (fd >= 0)
+ close(fd);
+
+ return ret;
+}
+
+static int
+system_get_dev_sysctl(const char *path, const char *device, char *buf, const size_t buf_sz)
+{
+ snprintf(dev_buf, sizeof(dev_buf), path, device);
+ return system_get_sysctl(dev_buf, buf, buf_sz);
+}
+
+static int system_get_disable_ipv6(struct device *dev, char *buf, const size_t buf_sz)
+{
+ return system_get_dev_sysctl("/proc/sys/net/ipv6/conf/%s/disable_ipv6",
+ dev->ifname, buf, buf_sz);
+}
+