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 * Frame handler other utility functions for HSR and PRP. 8 */ 9 10 #include "hsr_slave.h" 11 #include <linux/etherdevice.h> 12 #include <linux/if_arp.h> 13 #include <linux/if_vlan.h> 14 #include "hsr_main.h" 15 #include "hsr_device.h" 16 #include "hsr_forward.h" 17 #include "hsr_framereg.h" 18 19 bool hsr_invalid_dan_ingress_frame(__be16 protocol) 20 { 21 return (protocol != htons(ETH_P_PRP) && protocol != htons(ETH_P_HSR)); 22 } 23 24 static rx_handler_result_t hsr_handle_frame(struct sk_buff **pskb) 25 { 26 struct sk_buff *skb = *pskb; 27 struct hsr_port *port; 28 struct hsr_priv *hsr; 29 __be16 protocol; 30 31 /* Packets from dev_loopback_xmit() do not have L2 header, bail out */ 32 if (unlikely(skb->pkt_type == PACKET_LOOPBACK)) 33 return RX_HANDLER_PASS; 34 35 if (!skb_mac_header_was_set(skb)) { 36 WARN_ONCE(1, "%s: skb invalid", __func__); 37 return RX_HANDLER_PASS; 38 } 39 40 port = hsr_port_get_rcu(skb->dev); 41 if (!port) 42 goto finish_pass; 43 hsr = port->hsr; 44 45 if (hsr_addr_is_self(port->hsr, eth_hdr(skb)->h_source)) { 46 /* Directly kill frames sent by ourselves */ 47 kfree_skb(skb); 48 goto finish_consume; 49 } 50 51 /* For HSR, only tagged frames are expected (unless the device offloads 52 * HSR tag removal), but for PRP there could be non tagged frames as 53 * well from Single attached nodes (SANs). 54 */ 55 protocol = eth_hdr(skb)->h_proto; 56 57 if (!(port->dev->features & NETIF_F_HW_HSR_TAG_RM) && 58 port->type != HSR_PT_INTERLINK && 59 hsr->proto_ops->invalid_dan_ingress_frame && 60 hsr->proto_ops->invalid_dan_ingress_frame(protocol)) 61 goto finish_pass; 62 63 skb_push(skb, ETH_HLEN); 64 skb_reset_mac_header(skb); 65 if ((!hsr->prot_version && protocol == htons(ETH_P_PRP)) || 66 protocol == htons(ETH_P_HSR)) { 67 if (!pskb_may_pull(skb, ETH_HLEN + HSR_HLEN)) { 68 kfree_skb(skb); 69 goto finish_consume; 70 } 71 72 skb_set_network_header(skb, ETH_HLEN + HSR_HLEN); 73 } 74 skb_reset_mac_len(skb); 75 76 /* Only the frames received over the interlink port will assign a 77 * sequence number and require synchronisation vs other sender. 78 */ 79 if (port->type == HSR_PT_INTERLINK) { 80 spin_lock_bh(&hsr->seqnr_lock); 81 hsr_forward_skb(skb, port); 82 spin_unlock_bh(&hsr->seqnr_lock); 83 } else { 84 hsr_forward_skb(skb, port); 85 } 86 87 finish_consume: 88 return RX_HANDLER_CONSUMED; 89 90 finish_pass: 91 return RX_HANDLER_PASS; 92 } 93 94 bool hsr_port_exists(const struct net_device *dev) 95 { 96 return rcu_access_pointer(dev->rx_handler) == hsr_handle_frame; 97 } 98 99 static int hsr_check_dev_ok(struct net_device *dev, 100 struct netlink_ext_ack *extack) 101 { 102 /* Don't allow HSR on non-ethernet like devices */ 103 if ((dev->flags & IFF_LOOPBACK) || dev->type != ARPHRD_ETHER || 104 dev->addr_len != ETH_ALEN) { 105 NL_SET_ERR_MSG_MOD(extack, "Cannot use loopback or non-ethernet device as HSR slave."); 106 return -EINVAL; 107 } 108 109 /* Don't allow enslaving hsr devices */ 110 if (is_hsr_master(dev)) { 111 NL_SET_ERR_MSG_MOD(extack, 112 "Cannot create trees of HSR devices."); 113 return -EINVAL; 114 } 115 116 if (hsr_port_exists(dev)) { 117 NL_SET_ERR_MSG_MOD(extack, 118 "This device is already a HSR slave."); 119 return -EINVAL; 120 } 121 122 if (is_vlan_dev(dev)) { 123 NL_SET_ERR_MSG_MOD(extack, "HSR on top of VLAN is not yet supported in this driver."); 124 return -EINVAL; 125 } 126 127 if (dev->priv_flags & IFF_DONT_BRIDGE) { 128 NL_SET_ERR_MSG_MOD(extack, 129 "This device does not support bridging."); 130 return -EOPNOTSUPP; 131 } 132 133 /* HSR over bonded devices has not been tested, but I'm not sure it 134 * won't work... 135 */ 136 137 return 0; 138 } 139 140 /* Setup device to be added to the HSR bridge. */ 141 static int hsr_portdev_setup(struct hsr_priv *hsr, struct net_device *dev, 142 struct hsr_port *port, 143 struct netlink_ext_ack *extack) 144 145 { 146 struct netdev_lag_upper_info lag_upper_info; 147 struct net_device *hsr_dev; 148 struct hsr_port *master; 149 int res; 150 151 /* Don't use promiscuous mode for offload since L2 frame forward 152 * happens at the offloaded hardware. The interlink port never 153 * gets forwarding offload (RedBox forwarding to/from it is done 154 * by this driver), so it still needs promiscuous mode to receive 155 * frames addressed to hsr_dev's MAC rather than its own. 156 */ 157 if (!port->hsr->fwd_offloaded || port->type == HSR_PT_INTERLINK) { 158 res = dev_set_promiscuity(dev, 1); 159 if (res) 160 return res; 161 } 162 163 master = hsr_port_get_hsr(hsr, HSR_PT_MASTER); 164 hsr_dev = master->dev; 165 166 lag_upper_info.tx_type = NETDEV_LAG_TX_TYPE_BROADCAST; 167 lag_upper_info.hash_type = NETDEV_LAG_HASH_UNKNOWN; 168 res = netdev_master_upper_dev_link(dev, hsr_dev, NULL, &lag_upper_info, extack); 169 if (res) 170 goto fail_upper_dev_link; 171 172 res = netdev_rx_handler_register(dev, hsr_handle_frame, port); 173 if (res) 174 goto fail_rx_handler; 175 dev_disable_lro(dev); 176 177 return 0; 178 179 fail_rx_handler: 180 netdev_upper_dev_unlink(dev, hsr_dev); 181 fail_upper_dev_link: 182 if (!port->hsr->fwd_offloaded || port->type == HSR_PT_INTERLINK) 183 dev_set_promiscuity(dev, -1); 184 185 return res; 186 } 187 188 int hsr_add_port(struct hsr_priv *hsr, struct net_device *dev, 189 enum hsr_port_type type, struct netlink_ext_ack *extack) 190 { 191 struct hsr_port *port, *master; 192 int res; 193 194 if (type != HSR_PT_MASTER) { 195 res = hsr_check_dev_ok(dev, extack); 196 if (res) 197 return res; 198 } 199 200 port = hsr_port_get_hsr(hsr, type); 201 if (port) 202 return -EBUSY; /* This port already exists */ 203 204 port = kzalloc_obj(*port); 205 if (!port) 206 return -ENOMEM; 207 208 port->hsr = hsr; 209 port->dev = dev; 210 port->type = type; 211 ether_addr_copy(port->original_macaddress, dev->dev_addr); 212 213 list_add_tail_rcu(&port->port_list, &hsr->ports); 214 215 if (type != HSR_PT_MASTER) { 216 res = hsr_portdev_setup(hsr, dev, port, extack); 217 if (res) 218 goto fail_dev_setup; 219 } 220 221 master = hsr_port_get_hsr(hsr, HSR_PT_MASTER); 222 netdev_update_features(master->dev); 223 dev_set_mtu(master->dev, hsr_get_max_mtu(hsr)); 224 225 return 0; 226 227 fail_dev_setup: 228 list_del_rcu(&port->port_list); 229 kfree_rcu(port, rcu); 230 return res; 231 } 232 233 void hsr_del_port(struct hsr_port *port) 234 { 235 struct hsr_priv *hsr; 236 struct hsr_port *master; 237 238 hsr = port->hsr; 239 master = hsr_port_get_hsr(hsr, HSR_PT_MASTER); 240 list_del_rcu(&port->port_list); 241 242 if (port != master) { 243 netdev_update_features(master->dev); 244 dev_set_mtu(master->dev, hsr_get_max_mtu(hsr)); 245 netdev_rx_handler_unregister(port->dev); 246 if (!port->hsr->fwd_offloaded || port->type == HSR_PT_INTERLINK) 247 dev_set_promiscuity(port->dev, -1); 248 if (port->type == HSR_PT_SLAVE_A || port->type == HSR_PT_SLAVE_B) 249 vlan_vids_del_by_dev(port->dev, master->dev); 250 netdev_upper_dev_unlink(port->dev, master->dev); 251 if (hsr->prot_version == PRP_V1 && 252 port->type == HSR_PT_SLAVE_B) { 253 eth_hw_addr_set(port->dev, port->original_macaddress); 254 call_netdevice_notifiers(NETDEV_CHANGEADDR, port->dev); 255 } 256 } 257 258 kfree_rcu(port, rcu); 259 } 260