1 /* Copyright 2011-2014 Autronica Fire and Security AS 2 * 3 * This program is free software; you can redistribute it and/or modify it 4 * under the terms of the GNU General Public License as published by the Free 5 * Software Foundation; either version 2 of the License, or (at your option) 6 * any later version. 7 * 8 * Author(s): 9 * 2011-2014 Arvid Brodin, arvid.brodin@alten.se 10 */ 11 12 #include "hsr_slave.h" 13 #include <linux/etherdevice.h> 14 #include <linux/if_arp.h> 15 #include <linux/if_vlan.h> 16 #include "hsr_main.h" 17 #include "hsr_device.h" 18 #include "hsr_forward.h" 19 #include "hsr_framereg.h" 20 21 22 static rx_handler_result_t hsr_handle_frame(struct sk_buff **pskb) 23 { 24 struct sk_buff *skb = *pskb; 25 struct hsr_port *port; 26 u16 protocol; 27 28 if (!skb_mac_header_was_set(skb)) { 29 WARN_ONCE(1, "%s: skb invalid", __func__); 30 return RX_HANDLER_PASS; 31 } 32 33 rcu_read_lock(); /* hsr->node_db, hsr->ports */ 34 port = hsr_port_get_rcu(skb->dev); 35 36 if (hsr_addr_is_self(port->hsr, eth_hdr(skb)->h_source)) { 37 /* Directly kill frames sent by ourselves */ 38 kfree_skb(skb); 39 goto finish_consume; 40 } 41 42 protocol = eth_hdr(skb)->h_proto; 43 if (protocol != htons(ETH_P_PRP) && protocol != htons(ETH_P_HSR)) 44 goto finish_pass; 45 46 skb_push(skb, ETH_HLEN); 47 48 hsr_forward_skb(skb, port); 49 50 finish_consume: 51 rcu_read_unlock(); /* hsr->node_db, hsr->ports */ 52 return RX_HANDLER_CONSUMED; 53 54 finish_pass: 55 rcu_read_unlock(); /* hsr->node_db, hsr->ports */ 56 return RX_HANDLER_PASS; 57 } 58 59 bool hsr_port_exists(const struct net_device *dev) 60 { 61 return rcu_access_pointer(dev->rx_handler) == hsr_handle_frame; 62 } 63 64 65 static int hsr_check_dev_ok(struct net_device *dev) 66 { 67 /* Don't allow HSR on non-ethernet like devices */ 68 if ((dev->flags & IFF_LOOPBACK) || (dev->type != ARPHRD_ETHER) || 69 (dev->addr_len != ETH_ALEN)) { 70 netdev_info(dev, "Cannot use loopback or non-ethernet device as HSR slave.\n"); 71 return -EINVAL; 72 } 73 74 /* Don't allow enslaving hsr devices */ 75 if (is_hsr_master(dev)) { 76 netdev_info(dev, "Cannot create trees of HSR devices.\n"); 77 return -EINVAL; 78 } 79 80 if (hsr_port_exists(dev)) { 81 netdev_info(dev, "This device is already a HSR slave.\n"); 82 return -EINVAL; 83 } 84 85 if (is_vlan_dev(dev)) { 86 netdev_info(dev, "HSR on top of VLAN is not yet supported in this driver.\n"); 87 return -EINVAL; 88 } 89 90 if (dev->priv_flags & IFF_DONT_BRIDGE) { 91 netdev_info(dev, "This device does not support bridging.\n"); 92 return -EOPNOTSUPP; 93 } 94 95 /* HSR over bonded devices has not been tested, but I'm not sure it 96 * won't work... 97 */ 98 99 return 0; 100 } 101 102 103 /* Setup device to be added to the HSR bridge. */ 104 static int hsr_portdev_setup(struct net_device *dev, struct hsr_port *port) 105 { 106 int res; 107 108 dev_hold(dev); 109 res = dev_set_promiscuity(dev, 1); 110 if (res) 111 goto fail_promiscuity; 112 113 /* FIXME: 114 * What does net device "adjacency" mean? Should we do 115 * res = netdev_master_upper_dev_link(port->dev, port->hsr->dev); ? 116 */ 117 118 res = netdev_rx_handler_register(dev, hsr_handle_frame, port); 119 if (res) 120 goto fail_rx_handler; 121 dev_disable_lro(dev); 122 123 return 0; 124 125 fail_rx_handler: 126 dev_set_promiscuity(dev, -1); 127 fail_promiscuity: 128 dev_put(dev); 129 130 return res; 131 } 132 133 int hsr_add_port(struct hsr_priv *hsr, struct net_device *dev, 134 enum hsr_port_type type) 135 { 136 struct hsr_port *port, *master; 137 int res; 138 139 if (type != HSR_PT_MASTER) { 140 res = hsr_check_dev_ok(dev); 141 if (res) 142 return res; 143 } 144 145 port = hsr_port_get_hsr(hsr, type); 146 if (port != NULL) 147 return -EBUSY; /* This port already exists */ 148 149 port = kzalloc(sizeof(*port), GFP_KERNEL); 150 if (port == NULL) 151 return -ENOMEM; 152 153 if (type != HSR_PT_MASTER) { 154 res = hsr_portdev_setup(dev, port); 155 if (res) 156 goto fail_dev_setup; 157 } 158 159 port->hsr = hsr; 160 port->dev = dev; 161 port->type = type; 162 163 list_add_tail_rcu(&port->port_list, &hsr->ports); 164 synchronize_rcu(); 165 166 master = hsr_port_get_hsr(hsr, HSR_PT_MASTER); 167 netdev_update_features(master->dev); 168 dev_set_mtu(master->dev, hsr_get_max_mtu(hsr)); 169 170 return 0; 171 172 fail_dev_setup: 173 kfree(port); 174 return res; 175 } 176 177 void hsr_del_port(struct hsr_port *port) 178 { 179 struct hsr_priv *hsr; 180 struct hsr_port *master; 181 182 hsr = port->hsr; 183 master = hsr_port_get_hsr(hsr, HSR_PT_MASTER); 184 list_del_rcu(&port->port_list); 185 186 if (port != master) { 187 if (master != NULL) { 188 netdev_update_features(master->dev); 189 dev_set_mtu(master->dev, hsr_get_max_mtu(hsr)); 190 } 191 netdev_rx_handler_unregister(port->dev); 192 dev_set_promiscuity(port->dev, -1); 193 } 194 195 /* FIXME? 196 * netdev_upper_dev_unlink(port->dev, port->hsr->dev); 197 */ 198 199 synchronize_rcu(); 200 201 if (port != master) 202 dev_put(port->dev); 203 } 204