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 u16 sequence_nr; 206 u16 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 seqnr_lock; /* locking for sequence_nr */ 209 spinlock_t list_lock; /* locking for node list */ 210 struct hsr_proto_ops *proto_ops; 211 #define PRP_LAN_ID 0x5 /* 0x1010 for A and 0x1011 for B. Bit 0 is set 212 * based on SLAVE_A or SLAVE_B 213 */ 214 u8 net_id; /* for PRP, it occupies most significant 3 bits 215 * of lan_id 216 */ 217 bool fwd_offloaded; /* Forwarding offloaded to HW */ 218 bool redbox; /* Device supports HSR RedBox */ 219 unsigned char macaddress_redbox[ETH_ALEN]; 220 unsigned char sup_multicast_addr[ETH_ALEN] __aligned(sizeof(u16)); 221 /* Align to u16 boundary to avoid unaligned access 222 * in ether_addr_equal 223 */ 224 #ifdef CONFIG_DEBUG_FS 225 struct dentry *node_tbl_root; 226 #endif 227 }; 228 229 #define hsr_for_each_port(hsr, port) \ 230 list_for_each_entry_rcu((port), &(hsr)->ports, port_list) 231 232 struct hsr_port *hsr_port_get_hsr(struct hsr_priv *hsr, enum hsr_port_type pt); 233 234 /* Caller must ensure skb is a valid HSR frame */ 235 static inline u16 hsr_get_skb_sequence_nr(struct sk_buff *skb) 236 { 237 struct hsr_ethhdr *hsr_ethhdr; 238 239 hsr_ethhdr = (struct hsr_ethhdr *)skb_mac_header(skb); 240 return ntohs(hsr_ethhdr->hsr_tag.sequence_nr); 241 } 242 243 static inline struct prp_rct *skb_get_PRP_rct(struct sk_buff *skb) 244 { 245 unsigned char *tail = skb_tail_pointer(skb) - HSR_HLEN; 246 247 struct prp_rct *rct = (struct prp_rct *)tail; 248 249 if (rct->PRP_suffix == htons(ETH_P_PRP)) 250 return rct; 251 252 return NULL; 253 } 254 255 /* Assume caller has confirmed this skb is PRP suffixed */ 256 static inline u16 prp_get_skb_sequence_nr(struct prp_rct *rct) 257 { 258 return ntohs(rct->sequence_nr); 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