1/* SPDX-License-Identifier: GPL-2.0 */ 2#ifndef _NET_DN_DEV_H 3#define _NET_DN_DEV_H 4 5 6struct dn_dev; 7 8struct dn_ifaddr { 9 struct dn_ifaddr __rcu *ifa_next; 10 struct dn_dev *ifa_dev; 11 __le16 ifa_local; 12 __le16 ifa_address; 13 __u32 ifa_flags; 14 __u8 ifa_scope; 15 char ifa_label[IFNAMSIZ]; 16 struct rcu_head rcu; 17}; 18 19#define DN_DEV_S_RU 0 /* Run - working normally */ 20#define DN_DEV_S_CR 1 /* Circuit Rejected */ 21#define DN_DEV_S_DS 2 /* Data Link Start */ 22#define DN_DEV_S_RI 3 /* Routing Layer Initialize */ 23#define DN_DEV_S_RV 4 /* Routing Layer Verify */ 24#define DN_DEV_S_RC 5 /* Routing Layer Complete */ 25#define DN_DEV_S_OF 6 /* Off */ 26#define DN_DEV_S_HA 7 /* Halt */ 27 28 29/* 30 * The dn_dev_parms structure contains the set of parameters 31 * for each device (hence inclusion in the dn_dev structure) 32 * and an array is used to store the default types of supported 33 * device (in dn_dev.c). 34 * 35 * The type field matches the ARPHRD_ constants and is used in 36 * searching the list for supported devices when new devices 37 * come up. 38 * 39 * The mode field is used to find out if a device is broadcast, 40 * multipoint, or pointopoint. Please note that DECnet thinks 41 * different ways about devices to the rest of the kernel 42 * so the normal IFF_xxx flags are invalid here. For devices 43 * which can be any combination of the previously mentioned 44 * attributes, you can set this on a per device basis by 45 * installing an up() routine. 46 * 47 * The device state field, defines the initial state in which the 48 * device will come up. In the dn_dev structure, it is the actual 49 * state. 50 * 51 * Things have changed here. I've killed timer1 since it's a user space 52 * issue for a user space routing deamon to sort out. The kernel does 53 * not need to be bothered with it. 54 * 55 * Timers: 56 * t2 - Rate limit timer, min time between routing and hello messages 57 * t3 - Hello timer, send hello messages when it expires 58 * 59 * Callbacks: 60 * up() - Called to initialize device, return value can veto use of 61 * device with DECnet. 62 * down() - Called to turn device off when it goes down 63 * timer3() - Called once for each ifaddr when timer 3 goes off 64 * 65 * sysctl - Hook for sysctl things 66 * 67 */ 68struct dn_dev_parms { 69 int type; /* ARPHRD_xxx */ 70 int mode; /* Broadcast, Unicast, Mulitpoint */ 71#define DN_DEV_BCAST 1 72#define DN_DEV_UCAST 2 73#define DN_DEV_MPOINT 4 74 int state; /* Initial state */ 75 int forwarding; /* 0=EndNode, 1=L1Router, 2=L2Router */ 76 unsigned long t2; /* Default value of t2 */ 77 unsigned long t3; /* Default value of t3 */ 78 int priority; /* Priority to be a router */ 79 char *name; /* Name for sysctl */ 80 int (*up)(struct net_device *); 81 void (*down)(struct net_device *); 82 void (*timer3)(struct net_device *, struct dn_ifaddr *ifa); 83 void *sysctl; 84}; 85 86 87struct dn_dev { 88 struct dn_ifaddr __rcu *ifa_list; 89 struct net_device *dev; 90 struct dn_dev_parms parms; 91 char use_long; 92 struct timer_list timer; 93 unsigned long t3; 94 struct neigh_parms *neigh_parms; 95 __u8 addr[ETH_ALEN]; 96 struct neighbour *router; /* Default router on circuit */ 97 struct neighbour *peer; /* Peer on pointopoint links */ 98 unsigned long uptime; /* Time device went up in jiffies */ 99}; 100 101struct dn_short_packet { 102 __u8 msgflg; 103 __le16 dstnode; 104 __le16 srcnode; 105 __u8 forward; 106} __packed; 107 108struct dn_long_packet { 109 __u8 msgflg; 110 __u8 d_area; 111 __u8 d_subarea; 112 __u8 d_id[6]; 113 __u8 s_area; 114 __u8 s_subarea; 115 __u8 s_id[6]; 116 __u8 nl2; 117 __u8 visit_ct; 118 __u8 s_class; 119 __u8 pt; 120} __packed; 121 122/*------------------------- DRP - Routing messages ---------------------*/ 123 124struct endnode_hello_message { 125 __u8 msgflg; 126 __u8 tiver[3]; 127 __u8 id[6]; 128 __u8 iinfo; 129 __le16 blksize; 130 __u8 area; 131 __u8 seed[8]; 132 __u8 neighbor[6]; 133 __le16 timer; 134 __u8 mpd; 135 __u8 datalen; 136 __u8 data[2]; 137} __packed; 138 139struct rtnode_hello_message { 140 __u8 msgflg; 141 __u8 tiver[3]; 142 __u8 id[6]; 143 __u8 iinfo; 144 __le16 blksize; 145 __u8 priority; 146 __u8 area; 147 __le16 timer; 148 __u8 mpd; 149} __packed; 150 151 152void dn_dev_init(void); 153void dn_dev_cleanup(void); 154 155int dn_dev_ioctl(unsigned int cmd, void __user *arg); 156 157void dn_dev_devices_off(void); 158void dn_dev_devices_on(void); 159 160void dn_dev_init_pkt(struct sk_buff *skb); 161void dn_dev_veri_pkt(struct sk_buff *skb); 162void dn_dev_hello(struct sk_buff *skb); 163 164void dn_dev_up(struct net_device *); 165void dn_dev_down(struct net_device *); 166 167int dn_dev_set_default(struct net_device *dev, int force); 168struct net_device *dn_dev_get_default(void); 169int dn_dev_bind_default(__le16 *addr); 170 171int register_dnaddr_notifier(struct notifier_block *nb); 172int unregister_dnaddr_notifier(struct notifier_block *nb); 173 174static inline int dn_dev_islocal(struct net_device *dev, __le16 addr) 175{ 176 struct dn_dev *dn_db; 177 struct dn_ifaddr *ifa; 178 int res = 0; 179 180 rcu_read_lock(); 181 dn_db = rcu_dereference(dev->dn_ptr); 182 if (dn_db == NULL) { 183 printk(KERN_DEBUG "dn_dev_islocal: Called for non DECnet device\n"); 184 goto out; 185 } 186 187 for (ifa = rcu_dereference(dn_db->ifa_list); 188 ifa != NULL; 189 ifa = rcu_dereference(ifa->ifa_next)) 190 if ((addr ^ ifa->ifa_local) == 0) { 191 res = 1; 192 break; 193 } 194out: 195 rcu_read_unlock(); 196 return res; 197} 198 199#endif /* _NET_DN_DEV_H */ 200