static struct snobj *queue_out_init(struct module *m, struct snobj *arg)
{
struct queue_out_priv *priv = get_priv(m);
struct snobj *t;
const char *port_name;
int ret;
if (!arg || snobj_type(arg) != TYPE_MAP)
return snobj_err(EINVAL, "Argument must be a map");
t = snobj_eval(arg, "port");
if (!t || !(port_name = snobj_str_get(t)))
return snobj_err(EINVAL, "Field 'port' must be specified");
t = snobj_eval(arg, "qid");
if (!t || snobj_type(t) != TYPE_INT)
return snobj_err(EINVAL, "Field 'qid' must be specified");
priv->qid = snobj_uint_get(t);
priv->port = find_port(port_name);
if (!priv->port)
return snobj_err(ENODEV, "Port %s not found", port_name);
ret = acquire_queues(priv->port, m, PACKET_DIR_OUT, &priv->qid, 1);
if (ret < 0)
return snobj_errno(-ret);
priv->send_pkts = priv->port->driver->send_pkts;
return NULL;
}
static struct snobj *set_ip_addr(struct port *p, int container_pid,
struct snobj *arg)
{
int child_pid;
int ret = 0;
if (snobj_type(arg) == TYPE_STR || snobj_type(arg) == TYPE_LIST) {
if (snobj_type(arg) == TYPE_LIST) {
if (arg->size == 0)
goto invalid_type;
for (int i = 0; i < arg->size; i++) {
struct snobj *addr = snobj_list_get(arg, i);
if (snobj_type(addr) != TYPE_STR)
goto invalid_type;
}
}
} else
goto invalid_type;
/* change network namespace if necessary */
if (container_pid) {
child_pid = fork();
if (child_pid < 0)
return snobj_errno(-child_pid);
if (child_pid == 0) {
char buf[1024];
int fd;
sprintf(buf, "/proc/%d/ns/net", container_pid);
fd = open(buf, O_RDONLY);
if (fd < 0) {
perror("open(/proc/pid/ns/net)");
exit(errno <= 255 ? errno: ENOMSG);
}
ret = setns(fd, 0);
if (ret < 0) {
perror("setns()");
exit(errno <= 255 ? errno: ENOMSG);
}
} else
goto wait_child;
}
switch (snobj_type(arg)) {
case TYPE_STR:
ret = set_ip_addr_single(p, snobj_str_get(arg));
if (ret < 0) {
if (container_pid) {
/* it must be the child */
assert(child_pid == 0);
exit(errno <= 255 ? errno: ENOMSG);
}
}
break;
case TYPE_LIST:
if (!arg->size)
goto invalid_type;
for (int i = 0; i < arg->size; i++) {
struct snobj *addr = snobj_list_get(arg, i);
ret = set_ip_addr_single(p, snobj_str_get(addr));
if (ret < 0) {
if (container_pid) {
/* it must be the child */
assert(child_pid == 0);
exit(errno <= 255 ? errno: ENOMSG);
} else
break;
}
}
break;
default:
assert(0);
}
if (container_pid) {
if (child_pid == 0) {
if (ret < 0) {
ret = -ret;
exit(ret <= 255 ? ret: ENOMSG);
} else
exit(0);
} else {
int exit_status;
wait_child:
ret = waitpid(child_pid, &exit_status, 0);
if (ret >= 0) {
assert(ret == child_pid);
ret = -WEXITSTATUS(exit_status);
} else
perror("waitpid()");
}
}
if (ret < 0)
return snobj_err_details(-ret, arg,
"Failed to set IP addresses " \
"(incorrect IP address format?)");
return NULL;
invalid_type:
return snobj_err(EINVAL, "'ip_addr' must be a string or list " \
"of IPv4/v6 addresses (e.g., '10.0.20.1/24')");
}