xref: /kernel/linux/linux-5.10/include/net/garp.h (revision 8c2ecf20) 
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _NET_GARP_H
3#define _NET_GARP_H
4
5#include <net/stp.h>
6
7#define GARP_PROTOCOL_ID	0x1
8#define GARP_END_MARK		0x0
9
10struct garp_pdu_hdr {
11	__be16	protocol;
12};
13
14struct garp_msg_hdr {
15	u8	attrtype;
16};
17
18enum garp_attr_event {
19	GARP_LEAVE_ALL,
20	GARP_JOIN_EMPTY,
21	GARP_JOIN_IN,
22	GARP_LEAVE_EMPTY,
23	GARP_LEAVE_IN,
24	GARP_EMPTY,
25};
26
27struct garp_attr_hdr {
28	u8	len;
29	u8	event;
30	u8	data[];
31};
32
33struct garp_skb_cb {
34	u8	cur_type;
35};
36
37static inline struct garp_skb_cb *garp_cb(struct sk_buff *skb)
38{
39	BUILD_BUG_ON(sizeof(struct garp_skb_cb) >
40		     sizeof_field(struct sk_buff, cb));
41	return (struct garp_skb_cb *)skb->cb;
42}
43
44enum garp_applicant_state {
45	GARP_APPLICANT_INVALID,
46	GARP_APPLICANT_VA,
47	GARP_APPLICANT_AA,
48	GARP_APPLICANT_QA,
49	GARP_APPLICANT_LA,
50	GARP_APPLICANT_VP,
51	GARP_APPLICANT_AP,
52	GARP_APPLICANT_QP,
53	GARP_APPLICANT_VO,
54	GARP_APPLICANT_AO,
55	GARP_APPLICANT_QO,
56	__GARP_APPLICANT_MAX
57};
58#define GARP_APPLICANT_MAX	(__GARP_APPLICANT_MAX - 1)
59
60enum garp_event {
61	GARP_EVENT_REQ_JOIN,
62	GARP_EVENT_REQ_LEAVE,
63	GARP_EVENT_R_JOIN_IN,
64	GARP_EVENT_R_JOIN_EMPTY,
65	GARP_EVENT_R_EMPTY,
66	GARP_EVENT_R_LEAVE_IN,
67	GARP_EVENT_R_LEAVE_EMPTY,
68	GARP_EVENT_TRANSMIT_PDU,
69	__GARP_EVENT_MAX
70};
71#define GARP_EVENT_MAX		(__GARP_EVENT_MAX - 1)
72
73enum garp_action {
74	GARP_ACTION_NONE,
75	GARP_ACTION_S_JOIN_IN,
76	GARP_ACTION_S_LEAVE_EMPTY,
77};
78
79struct garp_attr {
80	struct rb_node			node;
81	enum garp_applicant_state	state;
82	u8				type;
83	u8				dlen;
84	unsigned char			data[];
85};
86
87enum garp_applications {
88	GARP_APPLICATION_GVRP,
89	__GARP_APPLICATION_MAX
90};
91#define GARP_APPLICATION_MAX	(__GARP_APPLICATION_MAX - 1)
92
93struct garp_application {
94	enum garp_applications	type;
95	unsigned int		maxattr;
96	struct stp_proto	proto;
97};
98
99struct garp_applicant {
100	struct garp_application	*app;
101	struct net_device	*dev;
102	struct timer_list	join_timer;
103
104	spinlock_t		lock;
105	struct sk_buff_head	queue;
106	struct sk_buff		*pdu;
107	struct rb_root		gid;
108	struct rcu_head		rcu;
109};
110
111struct garp_port {
112	struct garp_applicant __rcu	*applicants[GARP_APPLICATION_MAX + 1];
113	struct rcu_head			rcu;
114};
115
116int garp_register_application(struct garp_application *app);
117void garp_unregister_application(struct garp_application *app);
118
119int garp_init_applicant(struct net_device *dev, struct garp_application *app);
120void garp_uninit_applicant(struct net_device *dev,
121			   struct garp_application *app);
122
123int garp_request_join(const struct net_device *dev,
124		      const struct garp_application *app, const void *data,
125		      u8 len, u8 type);
126void garp_request_leave(const struct net_device *dev,
127			const struct garp_application *app,
128			const void *data, u8 len, u8 type);
129
130#endif /* _NET_GARP_H */
131