#define format_parent_cgroup_path(buf, path) \
format_cgroup_path_pid(buf, path, getppid())
-#define format_classid_path(buf) \
- snprintf(buf, sizeof(buf), "%s%s", NETCLS_MOUNT_PATH, \
- CGROUP_WORK_DIR)
+#define format_classid_path_pid(buf, pid) \
+ snprintf(buf, sizeof(buf), "%s%s%d", NETCLS_MOUNT_PATH, \
+ CGROUP_WORK_DIR, pid)
+
+#define format_classid_path(buf) \
+ format_classid_path_pid(buf, getpid())
static __thread bool cgroup_workdir_mounted;
/**
* set_classid() - Set a cgroupv1 net_cls classid
- * @id: the numeric classid
*
- * Writes the passed classid into the cgroup work dir's net_cls.classid
+ * Writes the classid into the cgroup work dir's net_cls.classid
* file in order to later on trigger socket tagging.
*
+ * We leverage the current pid as the classid, ensuring unique identification.
+ *
* On success, it returns 0, otherwise on failure it returns 1. If there
* is a failure, it prints the error to stderr.
*/
-int set_classid(unsigned int id)
+int set_classid(void)
{
char cgroup_workdir[PATH_MAX - 42];
char cgroup_classid_path[PATH_MAX + 1];
return 1;
}
- if (dprintf(fd, "%u\n", id) < 0) {
+ if (dprintf(fd, "%u\n", getpid()) < 0) {
log_err("Setting cgroup classid");
rc = 1;
}