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// SPDX-License-Identifier: GPL-2.0
/* Copyright 2011-2014 Autronica Fire and Security AS
*
* Author(s):
* 2011-2014 Arvid Brodin, arvid.brodin@alten.se
*
* Frame handler other utility functions for HSR and PRP.
*/
#include "hsr_slave.h"
#include <linux/etherdevice.h>
#include <linux/if_arp.h>
#include <linux/if_vlan.h>
#include "hsr_main.h"
#include "hsr_device.h"
#include "hsr_forward.h"
#include "hsr_framereg.h"
bool hsr_invalid_dan_ingress_frame(__be16 protocol)
{
return (protocol != htons(ETH_P_PRP) && protocol != htons(ETH_P_HSR));
}
static rx_handler_result_t hsr_handle_frame(struct sk_buff **pskb)
{
struct sk_buff *skb = *pskb;
struct hsr_port *port;
struct hsr_priv *hsr;
__be16 protocol;
/* Packets from dev_loopback_xmit() do not have L2 header, bail out */
if (unlikely(skb->pkt_type == PACKET_LOOPBACK))
return RX_HANDLER_PASS;
if (!skb_mac_header_was_set(skb)) {
WARN_ONCE(1, "%s: skb invalid", __func__);
return RX_HANDLER_PASS;
}
port = hsr_port_get_rcu(skb->dev);
if (!port)
goto finish_pass;
hsr = port->hsr;
if (hsr_addr_is_self(port->hsr, eth_hdr(skb)->h_source)) {
/* Directly kill frames sent by ourselves */
kfree_skb(skb);
goto finish_consume;
}
/* For HSR, only tagged frames are expected (unless the device offloads
* HSR tag removal), but for PRP there could be non tagged frames as
* well from Single attached nodes (SANs).
*/
protocol = eth_hdr(skb)->h_proto;
if (!(port->dev->features & NETIF_F_HW_HSR_TAG_RM) &&
hsr->proto_ops->invalid_dan_ingress_frame &&
hsr->proto_ops->invalid_dan_ingress_frame(protocol))
goto finish_pass;
skb_push(skb, ETH_HLEN);
skb_reset_mac_header(skb);
if ((!hsr->prot_version && protocol == htons(ETH_P_PRP)) ||
protocol == htons(ETH_P_HSR))
skb_set_network_header(skb, ETH_HLEN + HSR_HLEN);
skb_reset_mac_len(skb);
hsr_forward_skb(skb, port);
finish_consume:
return RX_HANDLER_CONSUMED;
finish_pass:
return RX_HANDLER_PASS;
}
bool hsr_port_exists(const struct net_device *dev)
{
return rcu_access_pointer(dev->rx_handler) == hsr_handle_frame;
}
static int hsr_check_dev_ok(struct net_device *dev,
struct netlink_ext_ack *extack)
{
/* Don't allow HSR on non-ethernet like devices */
if ((dev->flags & IFF_LOOPBACK) || dev->type != ARPHRD_ETHER ||
dev->addr_len != ETH_ALEN) {
NL_SET_ERR_MSG_MOD(extack, "Cannot use loopback or non-ethernet device as HSR slave.");
return -EINVAL;
}
/* Don't allow enslaving hsr devices */
if (is_hsr_master(dev)) {
NL_SET_ERR_MSG_MOD(extack,
"Cannot create trees of HSR devices.");
return -EINVAL;
}
if (hsr_port_exists(dev)) {
NL_SET_ERR_MSG_MOD(extack,
"This device is already a HSR slave.");
return -EINVAL;
}
if (is_vlan_dev(dev)) {
NL_SET_ERR_MSG_MOD(extack, "HSR on top of VLAN is not yet supported in this driver.");
return -EINVAL;
}
if (dev->priv_flags & IFF_DONT_BRIDGE) {
NL_SET_ERR_MSG_MOD(extack,
"This device does not support bridging.");
return -EOPNOTSUPP;
}
/* HSR over bonded devices has not been tested, but I'm not sure it
* won't work...
*/
return 0;
}
/* Setup device to be added to the HSR bridge. */
static int hsr_portdev_setup(struct hsr_priv *hsr, struct net_device *dev,
struct hsr_port *port,
struct netlink_ext_ack *extack)
{
struct net_device *hsr_dev;
struct hsr_port *master;
int res;
/* Don't use promiscuous mode for offload since L2 frame forward
* happens at the offloaded hardware.
*/
if (!port->hsr->fwd_offloaded) {
res = dev_set_promiscuity(dev, 1);
if (res)
return res;
}
master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
hsr_dev = master->dev;
res = netdev_upper_dev_link(dev, hsr_dev, extack);
if (res)
goto fail_upper_dev_link;
res = netdev_rx_handler_register(dev, hsr_handle_frame, port);
if (res)
goto fail_rx_handler;
dev_disable_lro(dev);
return 0;
fail_rx_handler:
netdev_upper_dev_unlink(dev, hsr_dev);
fail_upper_dev_link:
if (!port->hsr->fwd_offloaded)
dev_set_promiscuity(dev, -1);
return res;
}
int hsr_add_port(struct hsr_priv *hsr, struct net_device *dev,
enum hsr_port_type type, struct netlink_ext_ack *extack)
{
struct hsr_port *port, *master;
int res;
if (type != HSR_PT_MASTER) {
res = hsr_check_dev_ok(dev, extack);
if (res)
return res;
}
port = hsr_port_get_hsr(hsr, type);
if (port)
return -EBUSY; /* This port already exists */
port = kzalloc(sizeof(*port), GFP_KERNEL);
if (!port)
return -ENOMEM;
port->hsr = hsr;
port->dev = dev;
port->type = type;
if (type != HSR_PT_MASTER) {
res = hsr_portdev_setup(hsr, dev, port, extack);
if (res)
goto fail_dev_setup;
}
list_add_tail_rcu(&port->port_list, &hsr->ports);
synchronize_rcu();
master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
netdev_update_features(master->dev);
dev_set_mtu(master->dev, hsr_get_max_mtu(hsr));
return 0;
fail_dev_setup:
kfree(port);
return res;
}
void hsr_del_port(struct hsr_port *port)
{
struct hsr_priv *hsr;
struct hsr_port *master;
hsr = port->hsr;
master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
list_del_rcu(&port->port_list);
if (port != master) {
netdev_update_features(master->dev);
dev_set_mtu(master->dev, hsr_get_max_mtu(hsr));
netdev_rx_handler_unregister(port->dev);
dev_set_promiscuity(port->dev, -1);
netdev_upper_dev_unlink(port->dev, master->dev);
}
synchronize_rcu();
kfree(port);
}
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