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