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