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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; | |
25 | ||
26 | if (!skb_mac_header_was_set(skb)) { | |
27 | WARN_ONCE(1, "%s: skb invalid", __func__); | |
28 | return RX_HANDLER_PASS; | |
29 | } | |
30 | ||
31 | rcu_read_lock(); /* hsr->node_db, hsr->ports */ | |
32 | port = hsr_port_get_rcu(skb->dev); | |
33 | ||
34 | if (hsr_addr_is_self(port->hsr, eth_hdr(skb)->h_source)) { | |
35 | /* Directly kill frames sent by ourselves */ | |
36 | kfree_skb(skb); | |
37 | goto finish_consume; | |
38 | } | |
39 | ||
40 | if (eth_hdr(skb)->h_proto != htons(ETH_P_PRP)) | |
41 | goto finish_pass; | |
42 | ||
43 | skb_push(skb, ETH_HLEN); | |
44 | ||
45 | hsr_forward_skb(skb, port); | |
46 | ||
47 | finish_consume: | |
48 | rcu_read_unlock(); /* hsr->node_db, hsr->ports */ | |
49 | return RX_HANDLER_CONSUMED; | |
50 | ||
51 | finish_pass: | |
52 | rcu_read_unlock(); /* hsr->node_db, hsr->ports */ | |
53 | return RX_HANDLER_PASS; | |
54 | } | |
55 | ||
56 | bool hsr_port_exists(const struct net_device *dev) | |
57 | { | |
58 | return rcu_access_pointer(dev->rx_handler) == hsr_handle_frame; | |
59 | } | |
60 | ||
61 | ||
c5a75911 | 62 | static int hsr_check_dev_ok(struct net_device *dev) |
51f3c605 AB |
63 | { |
64 | /* Don't allow HSR on non-ethernet like devices */ | |
65 | if ((dev->flags & IFF_LOOPBACK) || (dev->type != ARPHRD_ETHER) || | |
66 | (dev->addr_len != ETH_ALEN)) { | |
67 | netdev_info(dev, "Cannot use loopback or non-ethernet device as HSR slave.\n"); | |
68 | return -EINVAL; | |
69 | } | |
70 | ||
71 | /* Don't allow enslaving hsr devices */ | |
72 | if (is_hsr_master(dev)) { | |
73 | netdev_info(dev, "Cannot create trees of HSR devices.\n"); | |
74 | return -EINVAL; | |
75 | } | |
76 | ||
c5a75911 | 77 | if (hsr_port_exists(dev)) { |
51f3c605 AB |
78 | netdev_info(dev, "This device is already a HSR slave.\n"); |
79 | return -EINVAL; | |
80 | } | |
81 | ||
82 | if (dev->priv_flags & IFF_802_1Q_VLAN) { | |
83 | netdev_info(dev, "HSR on top of VLAN is not yet supported in this driver.\n"); | |
84 | return -EINVAL; | |
85 | } | |
86 | ||
f266a683 AB |
87 | if (dev->priv_flags & IFF_DONT_BRIDGE) { |
88 | netdev_info(dev, "This device does not support bridging.\n"); | |
89 | return -EOPNOTSUPP; | |
90 | } | |
91 | ||
51f3c605 AB |
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 | ||
c5a75911 AB |
100 | /* Setup device to be added to the HSR bridge. */ |
101 | static int hsr_portdev_setup(struct net_device *dev, struct hsr_port *port) | |
51f3c605 AB |
102 | { |
103 | int res; | |
104 | ||
105 | dev_hold(dev); | |
51f3c605 AB |
106 | res = dev_set_promiscuity(dev, 1); |
107 | if (res) | |
c5a75911 | 108 | goto fail_promiscuity; |
51f3c605 | 109 | |
c5a75911 AB |
110 | /* FIXME: |
111 | * What does net device "adjacency" mean? Should we do | |
112 | * res = netdev_master_upper_dev_link(port->dev, port->hsr->dev); ? | |
113 | */ | |
51f3c605 | 114 | |
f266a683 AB |
115 | res = netdev_rx_handler_register(dev, hsr_handle_frame, port); |
116 | if (res) | |
117 | goto fail_rx_handler; | |
118 | dev_disable_lro(dev); | |
119 | ||
51f3c605 AB |
120 | return 0; |
121 | ||
122 | fail_rx_handler: | |
123 | dev_set_promiscuity(dev, -1); | |
c5a75911 | 124 | fail_promiscuity: |
51f3c605 | 125 | dev_put(dev); |
c5a75911 | 126 | |
51f3c605 AB |
127 | return res; |
128 | } | |
129 | ||
c5a75911 AB |
130 | int hsr_add_port(struct hsr_priv *hsr, struct net_device *dev, |
131 | enum hsr_port_type type) | |
51f3c605 | 132 | { |
c5a75911 AB |
133 | struct hsr_port *port, *master; |
134 | int res; | |
51f3c605 | 135 | |
c5a75911 AB |
136 | if (type != HSR_PT_MASTER) { |
137 | res = hsr_check_dev_ok(dev); | |
138 | if (res) | |
139 | return res; | |
140 | } | |
141 | ||
142 | port = hsr_port_get_hsr(hsr, type); | |
143 | if (port != NULL) | |
144 | return -EBUSY; /* This port already exists */ | |
145 | ||
146 | port = kzalloc(sizeof(*port), GFP_KERNEL); | |
147 | if (port == NULL) | |
148 | return -ENOMEM; | |
149 | ||
150 | if (type != HSR_PT_MASTER) { | |
151 | res = hsr_portdev_setup(dev, port); | |
152 | if (res) | |
153 | goto fail_dev_setup; | |
154 | } | |
155 | ||
156 | port->hsr = hsr; | |
157 | port->dev = dev; | |
158 | port->type = type; | |
159 | ||
160 | list_add_tail_rcu(&port->port_list, &hsr->ports); | |
161 | synchronize_rcu(); | |
162 | ||
163 | master = hsr_port_get_hsr(hsr, HSR_PT_MASTER); | |
1cc1eb52 | 164 | netdev_update_features(master->dev); |
c5a75911 | 165 | dev_set_mtu(master->dev, hsr_get_max_mtu(hsr)); |
51f3c605 | 166 | |
c5a75911 AB |
167 | return 0; |
168 | ||
169 | fail_dev_setup: | |
170 | kfree(port); | |
171 | return res; | |
172 | } | |
173 | ||
174 | void hsr_del_port(struct hsr_port *port) | |
175 | { | |
176 | struct hsr_priv *hsr; | |
177 | struct hsr_port *master; | |
178 | ||
179 | hsr = port->hsr; | |
180 | master = hsr_port_get_hsr(hsr, HSR_PT_MASTER); | |
181 | list_del_rcu(&port->port_list); | |
182 | ||
183 | if (port != master) { | |
56b08fdc AB |
184 | if (master != NULL) { |
185 | netdev_update_features(master->dev); | |
186 | dev_set_mtu(master->dev, hsr_get_max_mtu(hsr)); | |
187 | } | |
c5a75911 AB |
188 | netdev_rx_handler_unregister(port->dev); |
189 | dev_set_promiscuity(port->dev, -1); | |
51f3c605 AB |
190 | } |
191 | ||
c5a75911 AB |
192 | /* FIXME? |
193 | * netdev_upper_dev_unlink(port->dev, port->hsr->dev); | |
194 | */ | |
195 | ||
51f3c605 | 196 | synchronize_rcu(); |
56b08fdc AB |
197 | |
198 | if (port != master) | |
199 | dev_put(port->dev); | |
51f3c605 | 200 | } |