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git.ipfire.org Git - thirdparty/linux.git/blob - net/hsr/hsr_slave.c
1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright 2011-2014 Autronica Fire and Security AS
5 * 2011-2014 Arvid Brodin, arvid.brodin@alten.se
9 #include <linux/etherdevice.h>
10 #include <linux/if_arp.h>
11 #include <linux/if_vlan.h>
13 #include "hsr_device.h"
14 #include "hsr_forward.h"
15 #include "hsr_framereg.h"
17 static rx_handler_result_t
hsr_handle_frame(struct sk_buff
**pskb
)
19 struct sk_buff
*skb
= *pskb
;
20 struct hsr_port
*port
;
23 if (!skb_mac_header_was_set(skb
)) {
24 WARN_ONCE(1, "%s: skb invalid", __func__
);
25 return RX_HANDLER_PASS
;
28 port
= hsr_port_get_rcu(skb
->dev
);
32 if (hsr_addr_is_self(port
->hsr
, eth_hdr(skb
)->h_source
)) {
33 /* Directly kill frames sent by ourselves */
38 protocol
= eth_hdr(skb
)->h_proto
;
39 if (protocol
!= htons(ETH_P_PRP
) && protocol
!= htons(ETH_P_HSR
))
42 skb_push(skb
, ETH_HLEN
);
44 hsr_forward_skb(skb
, port
);
47 return RX_HANDLER_CONSUMED
;
50 return RX_HANDLER_PASS
;
53 bool hsr_port_exists(const struct net_device
*dev
)
55 return rcu_access_pointer(dev
->rx_handler
) == hsr_handle_frame
;
58 static int hsr_check_dev_ok(struct net_device
*dev
,
59 struct netlink_ext_ack
*extack
)
61 /* Don't allow HSR on non-ethernet like devices */
62 if ((dev
->flags
& IFF_LOOPBACK
) || dev
->type
!= ARPHRD_ETHER
||
63 dev
->addr_len
!= ETH_ALEN
) {
64 NL_SET_ERR_MSG_MOD(extack
, "Cannot use loopback or non-ethernet device as HSR slave.");
68 /* Don't allow enslaving hsr devices */
69 if (is_hsr_master(dev
)) {
70 NL_SET_ERR_MSG_MOD(extack
,
71 "Cannot create trees of HSR devices.");
75 if (hsr_port_exists(dev
)) {
76 NL_SET_ERR_MSG_MOD(extack
,
77 "This device is already a HSR slave.");
81 if (is_vlan_dev(dev
)) {
82 NL_SET_ERR_MSG_MOD(extack
, "HSR on top of VLAN is not yet supported in this driver.");
86 if (dev
->priv_flags
& IFF_DONT_BRIDGE
) {
87 NL_SET_ERR_MSG_MOD(extack
,
88 "This device does not support bridging.");
92 /* HSR over bonded devices has not been tested, but I'm not sure it
99 /* Setup device to be added to the HSR bridge. */
100 static int hsr_portdev_setup(struct hsr_priv
*hsr
, struct net_device
*dev
,
101 struct hsr_port
*port
,
102 struct netlink_ext_ack
*extack
)
105 struct net_device
*hsr_dev
;
106 struct hsr_port
*master
;
109 res
= dev_set_promiscuity(dev
, 1);
113 master
= hsr_port_get_hsr(hsr
, HSR_PT_MASTER
);
114 hsr_dev
= master
->dev
;
116 res
= netdev_upper_dev_link(dev
, hsr_dev
, extack
);
118 goto fail_upper_dev_link
;
120 res
= netdev_rx_handler_register(dev
, hsr_handle_frame
, port
);
122 goto fail_rx_handler
;
123 dev_disable_lro(dev
);
128 netdev_upper_dev_unlink(dev
, hsr_dev
);
130 dev_set_promiscuity(dev
, -1);
134 int hsr_add_port(struct hsr_priv
*hsr
, struct net_device
*dev
,
135 enum hsr_port_type type
, struct netlink_ext_ack
*extack
)
137 struct hsr_port
*port
, *master
;
140 if (type
!= HSR_PT_MASTER
) {
141 res
= hsr_check_dev_ok(dev
, extack
);
146 port
= hsr_port_get_hsr(hsr
, type
);
148 return -EBUSY
; /* This port already exists */
150 port
= kzalloc(sizeof(*port
), GFP_KERNEL
);
158 if (type
!= HSR_PT_MASTER
) {
159 res
= hsr_portdev_setup(hsr
, dev
, port
, extack
);
164 list_add_tail_rcu(&port
->port_list
, &hsr
->ports
);
167 master
= hsr_port_get_hsr(hsr
, HSR_PT_MASTER
);
168 netdev_update_features(master
->dev
);
169 dev_set_mtu(master
->dev
, hsr_get_max_mtu(hsr
));
178 void hsr_del_port(struct hsr_port
*port
)
180 struct hsr_priv
*hsr
;
181 struct hsr_port
*master
;
184 master
= hsr_port_get_hsr(hsr
, HSR_PT_MASTER
);
185 list_del_rcu(&port
->port_list
);
187 if (port
!= master
) {
188 netdev_update_features(master
->dev
);
189 dev_set_mtu(master
->dev
, hsr_get_max_mtu(hsr
));
190 netdev_rx_handler_unregister(port
->dev
);
191 dev_set_promiscuity(port
->dev
, -1);
192 netdev_upper_dev_unlink(port
->dev
, master
->dev
);