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e748d0fd66
When port-to-port forwarding for interfaces in HSR node is enabled, disable promiscuous mode since L2 frame forward happens at the offloaded hardware. Signed-off-by: Ravi Gunasekaran <r-gunasekaran@ti.com> Reviewed-by: Simon Horman <simon.horman@corigine.com> Link: https://lore.kernel.org/r/20230614114710.31400-1-r-gunasekaran@ti.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
231 lines
5.3 KiB
C
231 lines
5.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright 2011-2014 Autronica Fire and Security AS
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*
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* Author(s):
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* 2011-2014 Arvid Brodin, arvid.brodin@alten.se
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*
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* Frame handler other utility functions for HSR and PRP.
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*/
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#include "hsr_slave.h"
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#include <linux/etherdevice.h>
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#include <linux/if_arp.h>
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#include <linux/if_vlan.h>
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#include "hsr_main.h"
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#include "hsr_device.h"
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#include "hsr_forward.h"
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#include "hsr_framereg.h"
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bool hsr_invalid_dan_ingress_frame(__be16 protocol)
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{
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return (protocol != htons(ETH_P_PRP) && protocol != htons(ETH_P_HSR));
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}
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static rx_handler_result_t hsr_handle_frame(struct sk_buff **pskb)
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{
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struct sk_buff *skb = *pskb;
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struct hsr_port *port;
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struct hsr_priv *hsr;
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__be16 protocol;
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/* Packets from dev_loopback_xmit() do not have L2 header, bail out */
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if (unlikely(skb->pkt_type == PACKET_LOOPBACK))
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return RX_HANDLER_PASS;
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if (!skb_mac_header_was_set(skb)) {
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WARN_ONCE(1, "%s: skb invalid", __func__);
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return RX_HANDLER_PASS;
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}
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port = hsr_port_get_rcu(skb->dev);
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if (!port)
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goto finish_pass;
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hsr = port->hsr;
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if (hsr_addr_is_self(port->hsr, eth_hdr(skb)->h_source)) {
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/* Directly kill frames sent by ourselves */
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kfree_skb(skb);
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goto finish_consume;
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}
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/* For HSR, only tagged frames are expected (unless the device offloads
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* HSR tag removal), but for PRP there could be non tagged frames as
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* well from Single attached nodes (SANs).
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*/
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protocol = eth_hdr(skb)->h_proto;
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if (!(port->dev->features & NETIF_F_HW_HSR_TAG_RM) &&
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hsr->proto_ops->invalid_dan_ingress_frame &&
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hsr->proto_ops->invalid_dan_ingress_frame(protocol))
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goto finish_pass;
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skb_push(skb, ETH_HLEN);
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skb_reset_mac_header(skb);
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if ((!hsr->prot_version && protocol == htons(ETH_P_PRP)) ||
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protocol == htons(ETH_P_HSR))
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skb_set_network_header(skb, ETH_HLEN + HSR_HLEN);
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skb_reset_mac_len(skb);
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hsr_forward_skb(skb, port);
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finish_consume:
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return RX_HANDLER_CONSUMED;
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finish_pass:
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return RX_HANDLER_PASS;
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}
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bool hsr_port_exists(const struct net_device *dev)
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{
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return rcu_access_pointer(dev->rx_handler) == hsr_handle_frame;
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}
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static int hsr_check_dev_ok(struct net_device *dev,
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struct netlink_ext_ack *extack)
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{
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/* Don't allow HSR on non-ethernet like devices */
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if ((dev->flags & IFF_LOOPBACK) || dev->type != ARPHRD_ETHER ||
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dev->addr_len != ETH_ALEN) {
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NL_SET_ERR_MSG_MOD(extack, "Cannot use loopback or non-ethernet device as HSR slave.");
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return -EINVAL;
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}
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/* Don't allow enslaving hsr devices */
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if (is_hsr_master(dev)) {
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NL_SET_ERR_MSG_MOD(extack,
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"Cannot create trees of HSR devices.");
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return -EINVAL;
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}
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if (hsr_port_exists(dev)) {
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NL_SET_ERR_MSG_MOD(extack,
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"This device is already a HSR slave.");
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return -EINVAL;
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}
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if (is_vlan_dev(dev)) {
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NL_SET_ERR_MSG_MOD(extack, "HSR on top of VLAN is not yet supported in this driver.");
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return -EINVAL;
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}
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if (dev->priv_flags & IFF_DONT_BRIDGE) {
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NL_SET_ERR_MSG_MOD(extack,
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"This device does not support bridging.");
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return -EOPNOTSUPP;
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}
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/* HSR over bonded devices has not been tested, but I'm not sure it
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* won't work...
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*/
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return 0;
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}
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/* Setup device to be added to the HSR bridge. */
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static int hsr_portdev_setup(struct hsr_priv *hsr, struct net_device *dev,
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struct hsr_port *port,
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struct netlink_ext_ack *extack)
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{
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struct net_device *hsr_dev;
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struct hsr_port *master;
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int res;
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/* Don't use promiscuous mode for offload since L2 frame forward
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* happens at the offloaded hardware.
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*/
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if (!port->hsr->fwd_offloaded) {
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res = dev_set_promiscuity(dev, 1);
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if (res)
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return res;
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}
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master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
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hsr_dev = master->dev;
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res = netdev_upper_dev_link(dev, hsr_dev, extack);
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if (res)
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goto fail_upper_dev_link;
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res = netdev_rx_handler_register(dev, hsr_handle_frame, port);
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if (res)
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goto fail_rx_handler;
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dev_disable_lro(dev);
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return 0;
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fail_rx_handler:
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netdev_upper_dev_unlink(dev, hsr_dev);
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fail_upper_dev_link:
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if (!port->hsr->fwd_offloaded)
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dev_set_promiscuity(dev, -1);
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return res;
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}
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int hsr_add_port(struct hsr_priv *hsr, struct net_device *dev,
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enum hsr_port_type type, struct netlink_ext_ack *extack)
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{
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struct hsr_port *port, *master;
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int res;
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if (type != HSR_PT_MASTER) {
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res = hsr_check_dev_ok(dev, extack);
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if (res)
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return res;
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}
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port = hsr_port_get_hsr(hsr, type);
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if (port)
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return -EBUSY; /* This port already exists */
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port = kzalloc(sizeof(*port), GFP_KERNEL);
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if (!port)
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return -ENOMEM;
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port->hsr = hsr;
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port->dev = dev;
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port->type = type;
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if (type != HSR_PT_MASTER) {
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res = hsr_portdev_setup(hsr, dev, port, extack);
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if (res)
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goto fail_dev_setup;
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}
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list_add_tail_rcu(&port->port_list, &hsr->ports);
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synchronize_rcu();
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master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
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netdev_update_features(master->dev);
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dev_set_mtu(master->dev, hsr_get_max_mtu(hsr));
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return 0;
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fail_dev_setup:
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kfree(port);
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return res;
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}
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void hsr_del_port(struct hsr_port *port)
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{
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struct hsr_priv *hsr;
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struct hsr_port *master;
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hsr = port->hsr;
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master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
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list_del_rcu(&port->port_list);
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if (port != master) {
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netdev_update_features(master->dev);
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dev_set_mtu(master->dev, hsr_get_max_mtu(hsr));
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netdev_rx_handler_unregister(port->dev);
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dev_set_promiscuity(port->dev, -1);
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netdev_upper_dev_unlink(port->dev, master->dev);
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}
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synchronize_rcu();
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kfree(port);
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}
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