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 "hsr_main.h" 16 #include "hsr_device.h" 17 #include "hsr_forward.h" 18 #include "hsr_framereg.h" 19 20 21 static rx_handler_result_t hsr_handle_frame(struct sk_buff **pskb) 22 { 23 struct sk_buff *skb = *pskb; 24 struct hsr_port *port; 25 u16 protocol; 26 27 if (!skb_mac_header_was_set(skb)) { 28 WARN_ONCE(1, "%s: skb invalid", __func__); 29 return RX_HANDLER_PASS; 30 } 31 32 rcu_read_lock(); /* hsr->node_db, hsr->ports */ 33 port = hsr_port_get_rcu(skb->dev); 34 35 if (hsr_addr_is_self(port->hsr, eth_hdr(skb)->h_source)) { 36 /* Directly kill frames sent by ourselves */ 37 kfree_skb(skb); 38 goto finish_consume; 39 } 40 41 protocol = eth_hdr(skb)->h_proto; 42 if (protocol != htons(ETH_P_PRP) && protocol != htons(ETH_P_HSR)) 43 goto finish_pass; 44 45 skb_push(skb, ETH_HLEN); 46 47 hsr_forward_skb(skb, port); 48 49 finish_consume: 50 rcu_read_unlock(); /* hsr->node_db, hsr->ports */ 51 return RX_HANDLER_CONSUMED; 52 53 finish_pass: 54 rcu_read_unlock(); /* hsr->node_db, hsr->ports */ 55 return RX_HANDLER_PASS; 56 } 57 58 bool hsr_port_exists(const struct net_device *dev) 59 { 60 return rcu_access_pointer(dev->rx_handler) == hsr_handle_frame; 61 } 62 63 64 static int hsr_check_dev_ok(struct net_device *dev) 65 { 66 /* Don't allow HSR on non-ethernet like devices */ 67 if ((dev->flags & IFF_LOOPBACK) || (dev->type != ARPHRD_ETHER) || 68 (dev->addr_len != ETH_ALEN)) { 69 netdev_info(dev, "Cannot use loopback or non-ethernet device as HSR slave.\n"); 70 return -EINVAL; 71 } 72 73 /* Don't allow enslaving hsr devices */ 74 if (is_hsr_master(dev)) { 75 netdev_info(dev, "Cannot create trees of HSR devices.\n"); 76 return -EINVAL; 77 } 78 79 if (hsr_port_exists(dev)) { 80 netdev_info(dev, "This device is already a HSR slave.\n"); 81 return -EINVAL; 82 } 83 84 if (dev->priv_flags & IFF_802_1Q_VLAN) { 85 netdev_info(dev, "HSR on top of VLAN is not yet supported in this driver.\n"); 86 return -EINVAL; 87 } 88 89 if (dev->priv_flags & IFF_DONT_BRIDGE) { 90 netdev_info(dev, "This device does not support bridging.\n"); 91 return -EOPNOTSUPP; 92 } 93 94 /* HSR over bonded devices has not been tested, but I'm not sure it 95 * won't work... 96 */ 97 98 return 0; 99 } 100 101 102 /* Setup device to be added to the HSR bridge. */ 103 static int hsr_portdev_setup(struct net_device *dev, struct hsr_port *port) 104 { 105 int res; 106 107 dev_hold(dev); 108 res = dev_set_promiscuity(dev, 1); 109 if (res) 110 goto fail_promiscuity; 111 112 /* FIXME: 113 * What does net device "adjacency" mean? Should we do 114 * res = netdev_master_upper_dev_link(port->dev, port->hsr->dev); ? 115 */ 116 117 res = netdev_rx_handler_register(dev, hsr_handle_frame, port); 118 if (res) 119 goto fail_rx_handler; 120 dev_disable_lro(dev); 121 122 return 0; 123 124 fail_rx_handler: 125 dev_set_promiscuity(dev, -1); 126 fail_promiscuity: 127 dev_put(dev); 128 129 return res; 130 } 131 132 int hsr_add_port(struct hsr_priv *hsr, struct net_device *dev, 133 enum hsr_port_type type) 134 { 135 struct hsr_port *port, *master; 136 int res; 137 138 if (type != HSR_PT_MASTER) { 139 res = hsr_check_dev_ok(dev); 140 if (res) 141 return res; 142 } 143 144 port = hsr_port_get_hsr(hsr, type); 145 if (port != NULL) 146 return -EBUSY; /* This port already exists */ 147 148 port = kzalloc(sizeof(*port), GFP_KERNEL); 149 if (port == NULL) 150 return -ENOMEM; 151 152 if (type != HSR_PT_MASTER) { 153 res = hsr_portdev_setup(dev, port); 154 if (res) 155 goto fail_dev_setup; 156 } 157 158 port->hsr = hsr; 159 port->dev = dev; 160 port->type = type; 161 162 list_add_tail_rcu(&port->port_list, &hsr->ports); 163 synchronize_rcu(); 164 165 master = hsr_port_get_hsr(hsr, HSR_PT_MASTER); 166 netdev_update_features(master->dev); 167 dev_set_mtu(master->dev, hsr_get_max_mtu(hsr)); 168 169 return 0; 170 171 fail_dev_setup: 172 kfree(port); 173 return res; 174 } 175 176 void hsr_del_port(struct hsr_port *port) 177 { 178 struct hsr_priv *hsr; 179 struct hsr_port *master; 180 181 hsr = port->hsr; 182 master = hsr_port_get_hsr(hsr, HSR_PT_MASTER); 183 list_del_rcu(&port->port_list); 184 185 if (port != master) { 186 if (master != NULL) { 187 netdev_update_features(master->dev); 188 dev_set_mtu(master->dev, hsr_get_max_mtu(hsr)); 189 } 190 netdev_rx_handler_unregister(port->dev); 191 dev_set_promiscuity(port->dev, -1); 192 } 193 194 /* FIXME? 195 * netdev_upper_dev_unlink(port->dev, port->hsr->dev); 196 */ 197 198 synchronize_rcu(); 199 200 if (port != master) 201 dev_put(port->dev); 202 } 203