1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* Copyright 2011-2014 Autronica Fire and Security AS
3 *
4 * Author(s):
5 * 2011-2014 Arvid Brodin, arvid.brodin@alten.se
6 *
7 * include file for HSR and PRP.
8 */
9
10 #ifndef __HSR_PRIVATE_H
11 #define __HSR_PRIVATE_H
12
13 #include <linux/netdevice.h>
14 #include <linux/list.h>
15 #include <linux/if_vlan.h>
16
17 /* Time constants as specified in the HSR specification (IEC-62439-3 2010)
18 * Table 8.
19 * All values in milliseconds.
20 */
21 #define HSR_LIFE_CHECK_INTERVAL 2000 /* ms */
22 #define HSR_NODE_FORGET_TIME 60000 /* ms */
23 #define HSR_ANNOUNCE_INTERVAL 100 /* ms */
24 #define HSR_ENTRY_FORGET_TIME 400 /* ms */
25
26 /* By how much may slave1 and slave2 timestamps of latest received frame from
27 * each node differ before we notify of communication problem?
28 */
29 #define MAX_SLAVE_DIFF 3000 /* ms */
30 #define HSR_SEQNR_START (USHRT_MAX - 1024)
31 #define HSR_SUP_SEQNR_START (HSR_SEQNR_START / 2)
32
33 /* How often shall we check for broken ring and remove node entries older than
34 * HSR_NODE_FORGET_TIME?
35 */
36 #define PRUNE_PERIOD 3000 /* ms */
37
38 #define HSR_TLV_ANNOUNCE 22
39 #define HSR_TLV_LIFE_CHECK 23
40 /* PRP V1 life check for Duplicate discard */
41 #define PRP_TLV_LIFE_CHECK_DD 20
42 /* PRP V1 life check for Duplicate Accept */
43 #define PRP_TLV_LIFE_CHECK_DA 21
44
45 /* HSR Tag.
46 * As defined in IEC-62439-3:2010, the HSR tag is really { ethertype = 0x88FB,
47 * path, LSDU_size, sequence Nr }. But we let eth_header() create { h_dest,
48 * h_source, h_proto = 0x88FB }, and add { path, LSDU_size, sequence Nr,
49 * encapsulated protocol } instead.
50 *
51 * Field names as defined in the IEC:2010 standard for HSR.
52 */
53 struct hsr_tag {
54 __be16 path_and_LSDU_size;
55 __be16 sequence_nr;
56 __be16 encap_proto;
57 } __packed;
58
59 #define HSR_HLEN 6
60
61 #define HSR_V1_SUP_LSDUSIZE 52
62
63 /* The helper functions below assumes that 'path' occupies the 4 most
64 * significant bits of the 16-bit field shared by 'path' and 'LSDU_size' (or
65 * equivalently, the 4 most significant bits of HSR tag byte 14).
66 *
67 * This is unclear in the IEC specification; its definition of MAC addresses
68 * indicates the spec is written with the least significant bit first (to the
69 * left). This, however, would mean that the LSDU field would be split in two
70 * with the path field in-between, which seems strange. I'm guessing the MAC
71 * address definition is in error.
72 */
73
set_hsr_tag_path(struct hsr_tag * ht,u16 path)74 static inline void set_hsr_tag_path(struct hsr_tag *ht, u16 path)
75 {
76 ht->path_and_LSDU_size =
77 htons((ntohs(ht->path_and_LSDU_size) & 0x0FFF) | (path << 12));
78 }
79
set_hsr_tag_LSDU_size(struct hsr_tag * ht,u16 LSDU_size)80 static inline void set_hsr_tag_LSDU_size(struct hsr_tag *ht, u16 LSDU_size)
81 {
82 ht->path_and_LSDU_size = htons((ntohs(ht->path_and_LSDU_size) &
83 0xF000) | (LSDU_size & 0x0FFF));
84 }
85
86 struct hsr_ethhdr {
87 struct ethhdr ethhdr;
88 struct hsr_tag hsr_tag;
89 } __packed;
90
91 struct hsr_vlan_ethhdr {
92 struct vlan_ethhdr vlanhdr;
93 struct hsr_tag hsr_tag;
94 } __packed;
95
96 /* HSR/PRP Supervision Frame data types.
97 * Field names as defined in the IEC:2010 standard for HSR.
98 */
99 struct hsr_sup_tag {
100 __be16 path_and_HSR_ver;
101 __be16 sequence_nr;
102 __u8 HSR_TLV_type;
103 __u8 HSR_TLV_length;
104 } __packed;
105
106 struct hsr_sup_payload {
107 unsigned char macaddress_A[ETH_ALEN];
108 } __packed;
109
set_hsr_stag_path(struct hsr_sup_tag * hst,u16 path)110 static inline void set_hsr_stag_path(struct hsr_sup_tag *hst, u16 path)
111 {
112 set_hsr_tag_path((struct hsr_tag *)hst, path);
113 }
114
set_hsr_stag_HSR_ver(struct hsr_sup_tag * hst,u16 HSR_ver)115 static inline void set_hsr_stag_HSR_ver(struct hsr_sup_tag *hst, u16 HSR_ver)
116 {
117 set_hsr_tag_LSDU_size((struct hsr_tag *)hst, HSR_ver);
118 }
119
120 struct hsrv0_ethhdr_sp {
121 struct ethhdr ethhdr;
122 struct hsr_sup_tag hsr_sup;
123 } __packed;
124
125 struct hsrv1_ethhdr_sp {
126 struct ethhdr ethhdr;
127 struct hsr_tag hsr;
128 struct hsr_sup_tag hsr_sup;
129 } __packed;
130
131 enum hsr_port_type {
132 HSR_PT_NONE = 0, /* Must be 0, used by framereg */
133 HSR_PT_SLAVE_A,
134 HSR_PT_SLAVE_B,
135 HSR_PT_INTERLINK,
136 HSR_PT_MASTER,
137 HSR_PT_PORTS, /* This must be the last item in the enum */
138 };
139
140 /* PRP Redunancy Control Trailor (RCT).
141 * As defined in IEC-62439-4:2012, the PRP RCT is really { sequence Nr,
142 * Lan indentifier (LanId), LSDU_size and PRP_suffix = 0x88FB }.
143 *
144 * Field names as defined in the IEC:2012 standard for PRP.
145 */
146 struct prp_rct {
147 __be16 sequence_nr;
148 __be16 lan_id_and_LSDU_size;
149 __be16 PRP_suffix;
150 } __packed;
151
get_prp_LSDU_size(struct prp_rct * rct)152 static inline u16 get_prp_LSDU_size(struct prp_rct *rct)
153 {
154 return ntohs(rct->lan_id_and_LSDU_size) & 0x0FFF;
155 }
156
set_prp_lan_id(struct prp_rct * rct,u16 lan_id)157 static inline void set_prp_lan_id(struct prp_rct *rct, u16 lan_id)
158 {
159 rct->lan_id_and_LSDU_size = htons((ntohs(rct->lan_id_and_LSDU_size) &
160 0x0FFF) | (lan_id << 12));
161 }
set_prp_LSDU_size(struct prp_rct * rct,u16 LSDU_size)162 static inline void set_prp_LSDU_size(struct prp_rct *rct, u16 LSDU_size)
163 {
164 rct->lan_id_and_LSDU_size = htons((ntohs(rct->lan_id_and_LSDU_size) &
165 0xF000) | (LSDU_size & 0x0FFF));
166 }
167
168 struct hsr_port {
169 struct list_head port_list;
170 struct net_device *dev;
171 struct hsr_priv *hsr;
172 enum hsr_port_type type;
173 };
174
175 /* used by driver internally to differentiate various protocols */
176 enum hsr_version {
177 HSR_V0 = 0,
178 HSR_V1,
179 PRP_V1,
180 };
181
182 struct hsr_frame_info;
183 struct hsr_node;
184
185 struct hsr_proto_ops {
186 /* format and send supervision frame */
187 void (*send_sv_frame)(struct hsr_port *port, unsigned long *interval);
188 void (*handle_san_frame)(bool san, enum hsr_port_type port,
189 struct hsr_node *node);
190 bool (*drop_frame)(struct hsr_frame_info *frame, struct hsr_port *port);
191 struct sk_buff * (*get_untagged_frame)(struct hsr_frame_info *frame,
192 struct hsr_port *port);
193 struct sk_buff * (*create_tagged_frame)(struct hsr_frame_info *frame,
194 struct hsr_port *port);
195 int (*fill_frame_info)(__be16 proto, struct sk_buff *skb,
196 struct hsr_frame_info *frame);
197 bool (*invalid_dan_ingress_frame)(__be16 protocol);
198 void (*update_san_info)(struct hsr_node *node, bool is_sup);
199 };
200
201 struct hsr_priv {
202 struct rcu_head rcu_head;
203 struct list_head ports;
204 struct list_head node_db; /* Known HSR nodes */
205 struct list_head self_node_db; /* MACs of slaves */
206 struct timer_list announce_timer; /* Supervision frame dispatch */
207 struct timer_list prune_timer;
208 int announce_count;
209 u16 sequence_nr;
210 u16 sup_sequence_nr; /* For HSRv1 separate seq_nr for supervision */
211 enum hsr_version prot_version; /* Indicate if HSRv0, HSRv1 or PRPv1 */
212 spinlock_t seqnr_lock; /* locking for sequence_nr */
213 spinlock_t list_lock; /* locking for node list */
214 struct hsr_proto_ops *proto_ops;
215 #define PRP_LAN_ID 0x5 /* 0x1010 for A and 0x1011 for B. Bit 0 is set
216 * based on SLAVE_A or SLAVE_B
217 */
218 u8 net_id; /* for PRP, it occupies most significant 3 bits
219 * of lan_id
220 */
221 unsigned char sup_multicast_addr[ETH_ALEN];
222 #ifdef CONFIG_DEBUG_FS
223 struct dentry *node_tbl_root;
224 #endif
225 };
226
227 #define hsr_for_each_port(hsr, port) \
228 list_for_each_entry_rcu((port), &(hsr)->ports, port_list)
229
230 struct hsr_port *hsr_port_get_hsr(struct hsr_priv *hsr, enum hsr_port_type pt);
231
232 /* Caller must ensure skb is a valid HSR frame */
hsr_get_skb_sequence_nr(struct sk_buff * skb)233 static inline u16 hsr_get_skb_sequence_nr(struct sk_buff *skb)
234 {
235 struct hsr_ethhdr *hsr_ethhdr;
236
237 hsr_ethhdr = (struct hsr_ethhdr *)skb_mac_header(skb);
238 return ntohs(hsr_ethhdr->hsr_tag.sequence_nr);
239 }
240
skb_get_PRP_rct(struct sk_buff * skb)241 static inline struct prp_rct *skb_get_PRP_rct(struct sk_buff *skb)
242 {
243 unsigned char *tail = skb_tail_pointer(skb) - HSR_HLEN;
244
245 struct prp_rct *rct = (struct prp_rct *)tail;
246
247 if (rct->PRP_suffix == htons(ETH_P_PRP))
248 return rct;
249
250 return NULL;
251 }
252
253 /* Assume caller has confirmed this skb is PRP suffixed */
prp_get_skb_sequence_nr(struct prp_rct * rct)254 static inline u16 prp_get_skb_sequence_nr(struct prp_rct *rct)
255 {
256 return ntohs(rct->sequence_nr);
257 }
258
get_prp_lan_id(struct prp_rct * rct)259 static inline u16 get_prp_lan_id(struct prp_rct *rct)
260 {
261 return ntohs(rct->lan_id_and_LSDU_size) >> 12;
262 }
263
264 /* assume there is a valid rct */
prp_check_lsdu_size(struct sk_buff * skb,struct prp_rct * rct,bool is_sup)265 static inline bool prp_check_lsdu_size(struct sk_buff *skb,
266 struct prp_rct *rct,
267 bool is_sup)
268 {
269 struct ethhdr *ethhdr;
270 int expected_lsdu_size;
271
272 if (is_sup) {
273 expected_lsdu_size = HSR_V1_SUP_LSDUSIZE;
274 } else {
275 ethhdr = (struct ethhdr *)skb_mac_header(skb);
276 expected_lsdu_size = skb->len - 14;
277 if (ethhdr->h_proto == htons(ETH_P_8021Q))
278 expected_lsdu_size -= 4;
279 }
280
281 return (expected_lsdu_size == get_prp_LSDU_size(rct));
282 }
283
284 #if IS_ENABLED(CONFIG_DEBUG_FS)
285 void hsr_debugfs_rename(struct net_device *dev);
286 void hsr_debugfs_init(struct hsr_priv *priv, struct net_device *hsr_dev);
287 void hsr_debugfs_term(struct hsr_priv *priv);
288 void hsr_debugfs_create_root(void);
289 void hsr_debugfs_remove_root(void);
290 #else
hsr_debugfs_rename(struct net_device * dev)291 static inline void hsr_debugfs_rename(struct net_device *dev)
292 {
293 }
hsr_debugfs_init(struct hsr_priv * priv,struct net_device * hsr_dev)294 static inline void hsr_debugfs_init(struct hsr_priv *priv,
295 struct net_device *hsr_dev)
296 {}
hsr_debugfs_term(struct hsr_priv * priv)297 static inline void hsr_debugfs_term(struct hsr_priv *priv)
298 {}
hsr_debugfs_create_root(void)299 static inline void hsr_debugfs_create_root(void)
300 {}
hsr_debugfs_remove_root(void)301 static inline void hsr_debugfs_remove_root(void)
302 {}
303 #endif
304
305 #endif /* __HSR_PRIVATE_H */
306