1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright 2011-2014 Autronica Fire and Security AS 3 * 4 * Author(s): 5 * 2011-2014 Arvid Brodin, arvid.brodin@alten.se 6 */ 7 8 #include "hsr_slave.h" 9 #include <linux/etherdevice.h> 10 #include <linux/if_arp.h> 11 #include <linux/if_vlan.h> 12 #include "hsr_main.h" 13 #include "hsr_device.h" 14 #include "hsr_forward.h" 15 #include "hsr_framereg.h" 16 17 static rx_handler_result_t hsr_handle_frame(struct sk_buff **pskb) 18 { 19 struct sk_buff *skb = *pskb; 20 struct hsr_port *port; 21 u16 protocol; 22 23 if (!skb_mac_header_was_set(skb)) { 24 WARN_ONCE(1, "%s: skb invalid", __func__); 25 return RX_HANDLER_PASS; 26 } 27 28 port = hsr_port_get_rcu(skb->dev); 29 if (!port) 30 goto finish_pass; 31 32 if (hsr_addr_is_self(port->hsr, eth_hdr(skb)->h_source)) { 33 /* Directly kill frames sent by ourselves */ 34 kfree_skb(skb); 35 goto finish_consume; 36 } 37 38 protocol = eth_hdr(skb)->h_proto; 39 if (protocol != htons(ETH_P_PRP) && protocol != htons(ETH_P_HSR)) 40 goto finish_pass; 41 42 skb_push(skb, ETH_HLEN); 43 44 hsr_forward_skb(skb, port); 45 46 finish_consume: 47 return RX_HANDLER_CONSUMED; 48 49 finish_pass: 50 return RX_HANDLER_PASS; 51 } 52 53 bool hsr_port_exists(const struct net_device *dev) 54 { 55 return rcu_access_pointer(dev->rx_handler) == hsr_handle_frame; 56 } 57 58 static int hsr_check_dev_ok(struct net_device *dev, 59 struct netlink_ext_ack *extack) 60 { 61 /* Don't allow HSR on non-ethernet like devices */ 62 if ((dev->flags & IFF_LOOPBACK) || dev->type != ARPHRD_ETHER || 63 dev->addr_len != ETH_ALEN) { 64 NL_SET_ERR_MSG_MOD(extack, "Cannot use loopback or non-ethernet device as HSR slave."); 65 return -EINVAL; 66 } 67 68 /* Don't allow enslaving hsr devices */ 69 if (is_hsr_master(dev)) { 70 NL_SET_ERR_MSG_MOD(extack, 71 "Cannot create trees of HSR devices."); 72 return -EINVAL; 73 } 74 75 if (hsr_port_exists(dev)) { 76 NL_SET_ERR_MSG_MOD(extack, 77 "This device is already a HSR slave."); 78 return -EINVAL; 79 } 80 81 if (is_vlan_dev(dev)) { 82 NL_SET_ERR_MSG_MOD(extack, "HSR on top of VLAN is not yet supported in this driver."); 83 return -EINVAL; 84 } 85 86 if (dev->priv_flags & IFF_DONT_BRIDGE) { 87 NL_SET_ERR_MSG_MOD(extack, 88 "This device does not support bridging."); 89 return -EOPNOTSUPP; 90 } 91 92 /* HSR over bonded devices has not been tested, but I'm not sure it 93 * won't work... 94 */ 95 96 return 0; 97 } 98 99 /* Setup device to be added to the HSR bridge. */ 100 static int hsr_portdev_setup(struct hsr_priv *hsr, struct net_device *dev, 101 struct hsr_port *port, 102 struct netlink_ext_ack *extack) 103 104 { 105 struct net_device *hsr_dev; 106 struct hsr_port *master; 107 int res; 108 109 res = dev_set_promiscuity(dev, 1); 110 if (res) 111 return res; 112 113 master = hsr_port_get_hsr(hsr, HSR_PT_MASTER); 114 hsr_dev = master->dev; 115 116 res = netdev_upper_dev_link(dev, hsr_dev, extack); 117 if (res) 118 goto fail_upper_dev_link; 119 120 res = netdev_rx_handler_register(dev, hsr_handle_frame, port); 121 if (res) 122 goto fail_rx_handler; 123 dev_disable_lro(dev); 124 125 return 0; 126 127 fail_rx_handler: 128 netdev_upper_dev_unlink(dev, hsr_dev); 129 fail_upper_dev_link: 130 dev_set_promiscuity(dev, -1); 131 return res; 132 } 133 134 int hsr_add_port(struct hsr_priv *hsr, struct net_device *dev, 135 enum hsr_port_type type, struct netlink_ext_ack *extack) 136 { 137 struct hsr_port *port, *master; 138 int res; 139 140 if (type != HSR_PT_MASTER) { 141 res = hsr_check_dev_ok(dev, extack); 142 if (res) 143 return res; 144 } 145 146 port = hsr_port_get_hsr(hsr, type); 147 if (port) 148 return -EBUSY; /* This port already exists */ 149 150 port = kzalloc(sizeof(*port), GFP_KERNEL); 151 if (!port) 152 return -ENOMEM; 153 154 port->hsr = hsr; 155 port->dev = dev; 156 port->type = type; 157 158 if (type != HSR_PT_MASTER) { 159 res = hsr_portdev_setup(hsr, dev, port, extack); 160 if (res) 161 goto fail_dev_setup; 162 } 163 164 list_add_tail_rcu(&port->port_list, &hsr->ports); 165 synchronize_rcu(); 166 167 master = hsr_port_get_hsr(hsr, HSR_PT_MASTER); 168 netdev_update_features(master->dev); 169 dev_set_mtu(master->dev, hsr_get_max_mtu(hsr)); 170 171 return 0; 172 173 fail_dev_setup: 174 kfree(port); 175 return res; 176 } 177 178 void hsr_del_port(struct hsr_port *port) 179 { 180 struct hsr_priv *hsr; 181 struct hsr_port *master; 182 183 hsr = port->hsr; 184 master = hsr_port_get_hsr(hsr, HSR_PT_MASTER); 185 list_del_rcu(&port->port_list); 186 187 if (port != master) { 188 netdev_update_features(master->dev); 189 dev_set_mtu(master->dev, hsr_get_max_mtu(hsr)); 190 netdev_rx_handler_unregister(port->dev); 191 dev_set_promiscuity(port->dev, -1); 192 netdev_upper_dev_unlink(port->dev, master->dev); 193 } 194 195 synchronize_rcu(); 196 197 kfree(port); 198 } 199