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81ba6afd AB |
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> | |
51f3c605 | 14 | #include <linux/if_arp.h> |
81ba6afd | 15 | #include "hsr_main.h" |
51f3c605 | 16 | #include "hsr_device.h" |
f266a683 | 17 | #include "hsr_forward.h" |
81ba6afd AB |
18 | #include "hsr_framereg.h" |
19 | ||
20 | ||
f266a683 AB |
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; | |
ee1c2797 | 25 | u16 protocol; |
f266a683 AB |
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 | ||
ee1c2797 PH |
41 | protocol = eth_hdr(skb)->h_proto; |
42 | if (protocol != htons(ETH_P_PRP) && protocol != htons(ETH_P_HSR)) | |
f266a683 AB |
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 | ||
c5a75911 | 64 | static int hsr_check_dev_ok(struct net_device *dev) |
51f3c605 AB |
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 | ||
c5a75911 | 79 | if (hsr_port_exists(dev)) { |
51f3c605 AB |
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 | ||
f266a683 AB |
89 | if (dev->priv_flags & IFF_DONT_BRIDGE) { |
90 | netdev_info(dev, "This device does not support bridging.\n"); | |
91 | return -EOPNOTSUPP; | |
92 | } | |
93 | ||
51f3c605 AB |
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 | ||
c5a75911 AB |
102 | /* Setup device to be added to the HSR bridge. */ |
103 | static int hsr_portdev_setup(struct net_device *dev, struct hsr_port *port) | |
51f3c605 AB |
104 | { |
105 | int res; | |
106 | ||
107 | dev_hold(dev); | |
51f3c605 AB |
108 | res = dev_set_promiscuity(dev, 1); |
109 | if (res) | |
c5a75911 | 110 | goto fail_promiscuity; |
51f3c605 | 111 | |
c5a75911 AB |
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 | */ | |
51f3c605 | 116 | |
f266a683 AB |
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 | ||
51f3c605 AB |
122 | return 0; |
123 | ||
124 | fail_rx_handler: | |
125 | dev_set_promiscuity(dev, -1); | |
c5a75911 | 126 | fail_promiscuity: |
51f3c605 | 127 | dev_put(dev); |
c5a75911 | 128 | |
51f3c605 AB |
129 | return res; |
130 | } | |
131 | ||
c5a75911 AB |
132 | int hsr_add_port(struct hsr_priv *hsr, struct net_device *dev, |
133 | enum hsr_port_type type) | |
51f3c605 | 134 | { |
c5a75911 AB |
135 | struct hsr_port *port, *master; |
136 | int res; | |
51f3c605 | 137 | |
c5a75911 AB |
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); | |
1cc1eb52 | 166 | netdev_update_features(master->dev); |
c5a75911 | 167 | dev_set_mtu(master->dev, hsr_get_max_mtu(hsr)); |
51f3c605 | 168 | |
c5a75911 AB |
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) { | |
56b08fdc AB |
186 | if (master != NULL) { |
187 | netdev_update_features(master->dev); | |
188 | dev_set_mtu(master->dev, hsr_get_max_mtu(hsr)); | |
189 | } | |
c5a75911 AB |
190 | netdev_rx_handler_unregister(port->dev); |
191 | dev_set_promiscuity(port->dev, -1); | |
51f3c605 AB |
192 | } |
193 | ||
c5a75911 AB |
194 | /* FIXME? |
195 | * netdev_upper_dev_unlink(port->dev, port->hsr->dev); | |
196 | */ | |
197 | ||
51f3c605 | 198 | synchronize_rcu(); |
56b08fdc AB |
199 | |
200 | if (port != master) | |
201 | dev_put(port->dev); | |
51f3c605 | 202 | } |