| // SPDX-License-Identifier: GPL-2.0 |
| /* Copyright 2011-2014 Autronica Fire and Security AS |
| * |
| * Author(s): |
| * 2011-2014 Arvid Brodin, arvid.brodin@alten.se |
| * |
| * This file contains device methods for creating, using and destroying |
| * virtual HSR devices. |
| */ |
| |
| #include <linux/netdevice.h> |
| #include <linux/skbuff.h> |
| #include <linux/etherdevice.h> |
| #include <linux/rtnetlink.h> |
| #include <linux/pkt_sched.h> |
| #include "hsr_device.h" |
| #include "hsr_slave.h" |
| #include "hsr_framereg.h" |
| #include "hsr_main.h" |
| #include "hsr_forward.h" |
| |
| static bool is_admin_up(struct net_device *dev) |
| { |
| return dev && (dev->flags & IFF_UP); |
| } |
| |
| static bool is_slave_up(struct net_device *dev) |
| { |
| return dev && is_admin_up(dev) && netif_oper_up(dev); |
| } |
| |
| static void __hsr_set_operstate(struct net_device *dev, int transition) |
| { |
| write_lock_bh(&dev_base_lock); |
| if (dev->operstate != transition) { |
| dev->operstate = transition; |
| write_unlock_bh(&dev_base_lock); |
| netdev_state_change(dev); |
| } else { |
| write_unlock_bh(&dev_base_lock); |
| } |
| } |
| |
| static void hsr_set_operstate(struct hsr_port *master, bool has_carrier) |
| { |
| if (!is_admin_up(master->dev)) { |
| __hsr_set_operstate(master->dev, IF_OPER_DOWN); |
| return; |
| } |
| |
| if (has_carrier) |
| __hsr_set_operstate(master->dev, IF_OPER_UP); |
| else |
| __hsr_set_operstate(master->dev, IF_OPER_LOWERLAYERDOWN); |
| } |
| |
| static bool hsr_check_carrier(struct hsr_port *master) |
| { |
| struct hsr_port *port; |
| bool has_carrier; |
| |
| has_carrier = false; |
| |
| rcu_read_lock(); |
| hsr_for_each_port(master->hsr, port) |
| if (port->type != HSR_PT_MASTER && is_slave_up(port->dev)) { |
| has_carrier = true; |
| break; |
| } |
| rcu_read_unlock(); |
| |
| if (has_carrier) |
| netif_carrier_on(master->dev); |
| else |
| netif_carrier_off(master->dev); |
| |
| return has_carrier; |
| } |
| |
| static void hsr_check_announce(struct net_device *hsr_dev, |
| unsigned char old_operstate) |
| { |
| struct hsr_priv *hsr; |
| |
| hsr = netdev_priv(hsr_dev); |
| |
| if (hsr_dev->operstate == IF_OPER_UP && old_operstate != IF_OPER_UP) { |
| /* Went up */ |
| hsr->announce_count = 0; |
| mod_timer(&hsr->announce_timer, |
| jiffies + msecs_to_jiffies(HSR_ANNOUNCE_INTERVAL)); |
| } |
| |
| if (hsr_dev->operstate != IF_OPER_UP && old_operstate == IF_OPER_UP) |
| /* Went down */ |
| del_timer(&hsr->announce_timer); |
| } |
| |
| void hsr_check_carrier_and_operstate(struct hsr_priv *hsr) |
| { |
| struct hsr_port *master; |
| unsigned char old_operstate; |
| bool has_carrier; |
| |
| master = hsr_port_get_hsr(hsr, HSR_PT_MASTER); |
| /* netif_stacked_transfer_operstate() cannot be used here since |
| * it doesn't set IF_OPER_LOWERLAYERDOWN (?) |
| */ |
| old_operstate = master->dev->operstate; |
| has_carrier = hsr_check_carrier(master); |
| hsr_set_operstate(master, has_carrier); |
| hsr_check_announce(master->dev, old_operstate); |
| } |
| |
| int hsr_get_max_mtu(struct hsr_priv *hsr) |
| { |
| unsigned int mtu_max; |
| struct hsr_port *port; |
| |
| mtu_max = ETH_DATA_LEN; |
| rcu_read_lock(); |
| hsr_for_each_port(hsr, port) |
| if (port->type != HSR_PT_MASTER) |
| mtu_max = min(port->dev->mtu, mtu_max); |
| rcu_read_unlock(); |
| |
| if (mtu_max < HSR_HLEN) |
| return 0; |
| return mtu_max - HSR_HLEN; |
| } |
| |
| static int hsr_dev_change_mtu(struct net_device *dev, int new_mtu) |
| { |
| struct hsr_priv *hsr; |
| struct hsr_port *master; |
| |
| hsr = netdev_priv(dev); |
| master = hsr_port_get_hsr(hsr, HSR_PT_MASTER); |
| |
| if (new_mtu > hsr_get_max_mtu(hsr)) { |
| netdev_info(master->dev, "A HSR master's MTU cannot be greater than the smallest MTU of its slaves minus the HSR Tag length (%d octets).\n", |
| HSR_HLEN); |
| return -EINVAL; |
| } |
| |
| dev->mtu = new_mtu; |
| |
| return 0; |
| } |
| |
| static int hsr_dev_open(struct net_device *dev) |
| { |
| struct hsr_priv *hsr; |
| struct hsr_port *port; |
| char designation; |
| |
| hsr = netdev_priv(dev); |
| designation = '\0'; |
| |
| rcu_read_lock(); |
| hsr_for_each_port(hsr, port) { |
| if (port->type == HSR_PT_MASTER) |
| continue; |
| switch (port->type) { |
| case HSR_PT_SLAVE_A: |
| designation = 'A'; |
| break; |
| case HSR_PT_SLAVE_B: |
| designation = 'B'; |
| break; |
| default: |
| designation = '?'; |
| } |
| if (!is_slave_up(port->dev)) |
| netdev_warn(dev, "Slave %c (%s) is not up; please bring it up to get a fully working HSR network\n", |
| designation, port->dev->name); |
| } |
| rcu_read_unlock(); |
| |
| if (designation == '\0') |
| netdev_warn(dev, "No slave devices configured\n"); |
| |
| return 0; |
| } |
| |
| static int hsr_dev_close(struct net_device *dev) |
| { |
| /* Nothing to do here. */ |
| return 0; |
| } |
| |
| static netdev_features_t hsr_features_recompute(struct hsr_priv *hsr, |
| netdev_features_t features) |
| { |
| netdev_features_t mask; |
| struct hsr_port *port; |
| |
| mask = features; |
| |
| /* Mask out all features that, if supported by one device, should be |
| * enabled for all devices (see NETIF_F_ONE_FOR_ALL). |
| * |
| * Anything that's off in mask will not be enabled - so only things |
| * that were in features originally, and also is in NETIF_F_ONE_FOR_ALL, |
| * may become enabled. |
| */ |
| features &= ~NETIF_F_ONE_FOR_ALL; |
| hsr_for_each_port(hsr, port) |
| features = netdev_increment_features(features, |
| port->dev->features, |
| mask); |
| |
| return features; |
| } |
| |
| static netdev_features_t hsr_fix_features(struct net_device *dev, |
| netdev_features_t features) |
| { |
| struct hsr_priv *hsr = netdev_priv(dev); |
| |
| return hsr_features_recompute(hsr, features); |
| } |
| |
| static int hsr_dev_xmit(struct sk_buff *skb, struct net_device *dev) |
| { |
| struct hsr_priv *hsr = netdev_priv(dev); |
| struct hsr_port *master; |
| |
| master = hsr_port_get_hsr(hsr, HSR_PT_MASTER); |
| skb->dev = master->dev; |
| hsr_forward_skb(skb, master); |
| |
| return NETDEV_TX_OK; |
| } |
| |
| static const struct header_ops hsr_header_ops = { |
| .create = eth_header, |
| .parse = eth_header_parse, |
| }; |
| |
| static void send_hsr_supervision_frame(struct hsr_port *master, |
| u8 type, u8 hsr_ver) |
| { |
| struct sk_buff *skb; |
| int hlen, tlen; |
| struct hsr_tag *hsr_tag; |
| struct hsr_sup_tag *hsr_stag; |
| struct hsr_sup_payload *hsr_sp; |
| unsigned long irqflags; |
| |
| hlen = LL_RESERVED_SPACE(master->dev); |
| tlen = master->dev->needed_tailroom; |
| skb = dev_alloc_skb(sizeof(struct hsr_tag) + |
| sizeof(struct hsr_sup_tag) + |
| sizeof(struct hsr_sup_payload) + hlen + tlen); |
| |
| if (!skb) |
| return; |
| |
| skb_reserve(skb, hlen); |
| |
| skb->dev = master->dev; |
| skb->protocol = htons(hsr_ver ? ETH_P_HSR : ETH_P_PRP); |
| skb->priority = TC_PRIO_CONTROL; |
| |
| if (dev_hard_header(skb, skb->dev, (hsr_ver ? ETH_P_HSR : ETH_P_PRP), |
| master->hsr->sup_multicast_addr, |
| skb->dev->dev_addr, skb->len) <= 0) |
| goto out; |
| skb_reset_mac_header(skb); |
| |
| if (hsr_ver > 0) { |
| hsr_tag = skb_put(skb, sizeof(struct hsr_tag)); |
| hsr_tag->encap_proto = htons(ETH_P_PRP); |
| set_hsr_tag_LSDU_size(hsr_tag, HSR_V1_SUP_LSDUSIZE); |
| } |
| |
| hsr_stag = skb_put(skb, sizeof(struct hsr_sup_tag)); |
| set_hsr_stag_path(hsr_stag, (hsr_ver ? 0x0 : 0xf)); |
| set_hsr_stag_HSR_ver(hsr_stag, hsr_ver); |
| |
| /* From HSRv1 on we have separate supervision sequence numbers. */ |
| spin_lock_irqsave(&master->hsr->seqnr_lock, irqflags); |
| if (hsr_ver > 0) { |
| hsr_stag->sequence_nr = htons(master->hsr->sup_sequence_nr); |
| hsr_tag->sequence_nr = htons(master->hsr->sequence_nr); |
| master->hsr->sup_sequence_nr++; |
| master->hsr->sequence_nr++; |
| } else { |
| hsr_stag->sequence_nr = htons(master->hsr->sequence_nr); |
| master->hsr->sequence_nr++; |
| } |
| spin_unlock_irqrestore(&master->hsr->seqnr_lock, irqflags); |
| |
| hsr_stag->HSR_TLV_type = type; |
| /* TODO: Why 12 in HSRv0? */ |
| hsr_stag->HSR_TLV_length = |
| hsr_ver ? sizeof(struct hsr_sup_payload) : 12; |
| |
| /* Payload: MacAddressA */ |
| hsr_sp = skb_put(skb, sizeof(struct hsr_sup_payload)); |
| ether_addr_copy(hsr_sp->macaddress_A, master->dev->dev_addr); |
| |
| if (skb_put_padto(skb, ETH_ZLEN + HSR_HLEN)) |
| return; |
| |
| hsr_forward_skb(skb, master); |
| return; |
| |
| out: |
| WARN_ONCE(1, "HSR: Could not send supervision frame\n"); |
| kfree_skb(skb); |
| } |
| |
| /* Announce (supervision frame) timer function |
| */ |
| static void hsr_announce(struct timer_list *t) |
| { |
| struct hsr_priv *hsr; |
| struct hsr_port *master; |
| unsigned long interval; |
| |
| hsr = from_timer(hsr, t, announce_timer); |
| |
| rcu_read_lock(); |
| master = hsr_port_get_hsr(hsr, HSR_PT_MASTER); |
| |
| if (hsr->announce_count < 3 && hsr->prot_version == 0) { |
| send_hsr_supervision_frame(master, HSR_TLV_ANNOUNCE, |
| hsr->prot_version); |
| hsr->announce_count++; |
| |
| interval = msecs_to_jiffies(HSR_ANNOUNCE_INTERVAL); |
| } else { |
| send_hsr_supervision_frame(master, HSR_TLV_LIFE_CHECK, |
| hsr->prot_version); |
| |
| interval = msecs_to_jiffies(HSR_LIFE_CHECK_INTERVAL); |
| } |
| |
| if (is_admin_up(master->dev)) |
| mod_timer(&hsr->announce_timer, jiffies + interval); |
| |
| rcu_read_unlock(); |
| } |
| |
| /* According to comments in the declaration of struct net_device, this function |
| * is "Called from unregister, can be used to call free_netdev". Ok then... |
| */ |
| static void hsr_dev_destroy(struct net_device *hsr_dev) |
| { |
| struct hsr_priv *hsr; |
| struct hsr_port *port; |
| |
| hsr = netdev_priv(hsr_dev); |
| |
| hsr_debugfs_term(hsr); |
| |
| rtnl_lock(); |
| hsr_for_each_port(hsr, port) |
| hsr_del_port(port); |
| rtnl_unlock(); |
| |
| del_timer_sync(&hsr->prune_timer); |
| del_timer_sync(&hsr->announce_timer); |
| |
| synchronize_rcu(); |
| } |
| |
| static const struct net_device_ops hsr_device_ops = { |
| .ndo_change_mtu = hsr_dev_change_mtu, |
| .ndo_open = hsr_dev_open, |
| .ndo_stop = hsr_dev_close, |
| .ndo_start_xmit = hsr_dev_xmit, |
| .ndo_fix_features = hsr_fix_features, |
| }; |
| |
| static struct device_type hsr_type = { |
| .name = "hsr", |
| }; |
| |
| void hsr_dev_setup(struct net_device *dev) |
| { |
| eth_hw_addr_random(dev); |
| |
| ether_setup(dev); |
| dev->min_mtu = 0; |
| dev->header_ops = &hsr_header_ops; |
| dev->netdev_ops = &hsr_device_ops; |
| SET_NETDEV_DEVTYPE(dev, &hsr_type); |
| dev->priv_flags |= IFF_NO_QUEUE; |
| |
| dev->needs_free_netdev = true; |
| dev->priv_destructor = hsr_dev_destroy; |
| |
| dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA | |
| NETIF_F_GSO_MASK | NETIF_F_HW_CSUM | |
| NETIF_F_HW_VLAN_CTAG_TX; |
| |
| dev->features = dev->hw_features; |
| |
| /* Prevent recursive tx locking */ |
| dev->features |= NETIF_F_LLTX; |
| /* VLAN on top of HSR needs testing and probably some work on |
| * hsr_header_create() etc. |
| */ |
| dev->features |= NETIF_F_VLAN_CHALLENGED; |
| /* Not sure about this. Taken from bridge code. netdev_features.h says |
| * it means "Does not change network namespaces". |
| */ |
| dev->features |= NETIF_F_NETNS_LOCAL; |
| } |
| |
| /* Return true if dev is a HSR master; return false otherwise. |
| */ |
| inline bool is_hsr_master(struct net_device *dev) |
| { |
| return (dev->netdev_ops->ndo_start_xmit == hsr_dev_xmit); |
| } |
| |
| /* Default multicast address for HSR Supervision frames */ |
| static const unsigned char def_multicast_addr[ETH_ALEN] __aligned(2) = { |
| 0x01, 0x15, 0x4e, 0x00, 0x01, 0x00 |
| }; |
| |
| int hsr_dev_finalize(struct net_device *hsr_dev, struct net_device *slave[2], |
| unsigned char multicast_spec, u8 protocol_version) |
| { |
| struct hsr_priv *hsr; |
| struct hsr_port *port; |
| int res; |
| |
| hsr = netdev_priv(hsr_dev); |
| INIT_LIST_HEAD(&hsr->ports); |
| INIT_LIST_HEAD(&hsr->node_db); |
| INIT_LIST_HEAD(&hsr->self_node_db); |
| |
| ether_addr_copy(hsr_dev->dev_addr, slave[0]->dev_addr); |
| |
| /* Make sure we recognize frames from ourselves in hsr_rcv() */ |
| res = hsr_create_self_node(&hsr->self_node_db, hsr_dev->dev_addr, |
| slave[1]->dev_addr); |
| if (res < 0) |
| return res; |
| |
| spin_lock_init(&hsr->seqnr_lock); |
| /* Overflow soon to find bugs easier: */ |
| hsr->sequence_nr = HSR_SEQNR_START; |
| hsr->sup_sequence_nr = HSR_SUP_SEQNR_START; |
| |
| timer_setup(&hsr->announce_timer, hsr_announce, 0); |
| timer_setup(&hsr->prune_timer, hsr_prune_nodes, 0); |
| |
| ether_addr_copy(hsr->sup_multicast_addr, def_multicast_addr); |
| hsr->sup_multicast_addr[ETH_ALEN - 1] = multicast_spec; |
| |
| hsr->prot_version = protocol_version; |
| |
| /* FIXME: should I modify the value of these? |
| * |
| * - hsr_dev->flags - i.e. |
| * IFF_MASTER/SLAVE? |
| * - hsr_dev->priv_flags - i.e. |
| * IFF_EBRIDGE? |
| * IFF_TX_SKB_SHARING? |
| * IFF_HSR_MASTER/SLAVE? |
| */ |
| |
| /* Make sure the 1st call to netif_carrier_on() gets through */ |
| netif_carrier_off(hsr_dev); |
| |
| res = hsr_add_port(hsr, hsr_dev, HSR_PT_MASTER); |
| if (res) |
| goto err_add_port; |
| |
| res = register_netdevice(hsr_dev); |
| if (res) |
| goto fail; |
| |
| res = hsr_add_port(hsr, slave[0], HSR_PT_SLAVE_A); |
| if (res) |
| goto fail; |
| res = hsr_add_port(hsr, slave[1], HSR_PT_SLAVE_B); |
| if (res) |
| goto fail; |
| |
| mod_timer(&hsr->prune_timer, jiffies + msecs_to_jiffies(PRUNE_PERIOD)); |
| res = hsr_debugfs_init(hsr, hsr_dev); |
| if (res) |
| goto fail; |
| |
| return 0; |
| |
| fail: |
| hsr_for_each_port(hsr, port) |
| hsr_del_port(port); |
| err_add_port: |
| hsr_del_node(&hsr->self_node_db); |
| |
| return res; |
| } |