This source file includes following definitions.
- hsr_handle_frame
- hsr_port_exists
- hsr_check_dev_ok
- hsr_portdev_setup
- hsr_add_port
- hsr_del_port
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8 #include "hsr_slave.h"
9 #include <linux/etherdevice.h>
10 #include <linux/if_arp.h>
11 #include <linux/if_vlan.h>
12 #include "hsr_main.h"
13 #include "hsr_device.h"
14 #include "hsr_forward.h"
15 #include "hsr_framereg.h"
16
17 static rx_handler_result_t hsr_handle_frame(struct sk_buff **pskb)
18 {
19 struct sk_buff *skb = *pskb;
20 struct hsr_port *port;
21 u16 protocol;
22
23 if (!skb_mac_header_was_set(skb)) {
24 WARN_ONCE(1, "%s: skb invalid", __func__);
25 return RX_HANDLER_PASS;
26 }
27
28 rcu_read_lock();
29 port = hsr_port_get_rcu(skb->dev);
30 if (!port)
31 goto finish_pass;
32
33 if (hsr_addr_is_self(port->hsr, eth_hdr(skb)->h_source)) {
34
35 kfree_skb(skb);
36 goto finish_consume;
37 }
38
39 protocol = eth_hdr(skb)->h_proto;
40 if (protocol != htons(ETH_P_PRP) && protocol != htons(ETH_P_HSR))
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();
49 return RX_HANDLER_CONSUMED;
50
51 finish_pass:
52 rcu_read_unlock();
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 static int hsr_check_dev_ok(struct net_device *dev)
62 {
63
64 if ((dev->flags & IFF_LOOPBACK) || dev->type != ARPHRD_ETHER ||
65 dev->addr_len != ETH_ALEN) {
66 netdev_info(dev, "Cannot use loopback or non-ethernet device as HSR slave.\n");
67 return -EINVAL;
68 }
69
70
71 if (is_hsr_master(dev)) {
72 netdev_info(dev, "Cannot create trees of HSR devices.\n");
73 return -EINVAL;
74 }
75
76 if (hsr_port_exists(dev)) {
77 netdev_info(dev, "This device is already a HSR slave.\n");
78 return -EINVAL;
79 }
80
81 if (is_vlan_dev(dev)) {
82 netdev_info(dev, "HSR on top of VLAN is not yet supported in this driver.\n");
83 return -EINVAL;
84 }
85
86 if (dev->priv_flags & IFF_DONT_BRIDGE) {
87 netdev_info(dev, "This device does not support bridging.\n");
88 return -EOPNOTSUPP;
89 }
90
91
92
93
94
95 return 0;
96 }
97
98
99 static int hsr_portdev_setup(struct net_device *dev, struct hsr_port *port)
100 {
101 int res;
102
103 dev_hold(dev);
104 res = dev_set_promiscuity(dev, 1);
105 if (res)
106 goto fail_promiscuity;
107
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110
111
112
113 res = netdev_rx_handler_register(dev, hsr_handle_frame, port);
114 if (res)
115 goto fail_rx_handler;
116 dev_disable_lro(dev);
117
118 return 0;
119
120 fail_rx_handler:
121 dev_set_promiscuity(dev, -1);
122 fail_promiscuity:
123 dev_put(dev);
124
125 return res;
126 }
127
128 int hsr_add_port(struct hsr_priv *hsr, struct net_device *dev,
129 enum hsr_port_type type)
130 {
131 struct hsr_port *port, *master;
132 int res;
133
134 if (type != HSR_PT_MASTER) {
135 res = hsr_check_dev_ok(dev);
136 if (res)
137 return res;
138 }
139
140 port = hsr_port_get_hsr(hsr, type);
141 if (port)
142 return -EBUSY;
143
144 port = kzalloc(sizeof(*port), GFP_KERNEL);
145 if (!port)
146 return -ENOMEM;
147
148 port->hsr = hsr;
149 port->dev = dev;
150 port->type = type;
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 list_add_tail_rcu(&port->port_list, &hsr->ports);
159 synchronize_rcu();
160
161 master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
162 netdev_update_features(master->dev);
163 dev_set_mtu(master->dev, hsr_get_max_mtu(hsr));
164
165 return 0;
166
167 fail_dev_setup:
168 kfree(port);
169 return res;
170 }
171
172 void hsr_del_port(struct hsr_port *port)
173 {
174 struct hsr_priv *hsr;
175 struct hsr_port *master;
176
177 hsr = port->hsr;
178 master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
179 list_del_rcu(&port->port_list);
180
181 if (port != master) {
182 if (master) {
183 netdev_update_features(master->dev);
184 dev_set_mtu(master->dev, hsr_get_max_mtu(hsr));
185 }
186 netdev_rx_handler_unregister(port->dev);
187 dev_set_promiscuity(port->dev, -1);
188 }
189
190
191
192
193
194 synchronize_rcu();
195
196 if (port != master)
197 dev_put(port->dev);
198 kfree(port);
199 }