187 lines · c
1/* SPDX-License-Identifier: GPL-2.0 */2#ifndef __LINUX_ATALK_H__3#define __LINUX_ATALK_H__4 5 6#include <net/sock.h>7#include <uapi/linux/atalk.h>8 9struct atalk_route {10 struct net_device *dev;11 struct atalk_addr target;12 struct atalk_addr gateway;13 int flags;14 struct atalk_route *next;15};16 17/**18 * struct atalk_iface - AppleTalk Interface19 * @dev - Network device associated with this interface20 * @address - Our address21 * @status - What are we doing?22 * @nets - Associated direct netrange23 * @next - next element in the list of interfaces24 */25struct atalk_iface {26 struct net_device *dev;27 struct atalk_addr address;28 int status;29#define ATIF_PROBE 1 /* Probing for an address */30#define ATIF_PROBE_FAIL 2 /* Probe collided */31 struct atalk_netrange nets;32 struct atalk_iface *next;33};34 35struct atalk_sock {36 /* struct sock has to be the first member of atalk_sock */37 struct sock sk;38 __be16 dest_net;39 __be16 src_net;40 unsigned char dest_node;41 unsigned char src_node;42 unsigned char dest_port;43 unsigned char src_port;44};45 46static inline struct atalk_sock *at_sk(struct sock *sk)47{48 return (struct atalk_sock *)sk;49}50 51struct ddpehdr {52 __be16 deh_len_hops; /* lower 10 bits are length, next 4 - hops */53 __be16 deh_sum;54 __be16 deh_dnet;55 __be16 deh_snet;56 __u8 deh_dnode;57 __u8 deh_snode;58 __u8 deh_dport;59 __u8 deh_sport;60 /* And netatalk apps expect to stick the type in themselves */61};62 63static __inline__ struct ddpehdr *ddp_hdr(struct sk_buff *skb)64{65 return (struct ddpehdr *)skb_transport_header(skb);66}67 68/* AppleTalk AARP headers */69struct elapaarp {70 __be16 hw_type;71#define AARP_HW_TYPE_ETHERNET 172#define AARP_HW_TYPE_TOKENRING 273 __be16 pa_type;74 __u8 hw_len;75 __u8 pa_len;76#define AARP_PA_ALEN 477 __be16 function;78#define AARP_REQUEST 179#define AARP_REPLY 280#define AARP_PROBE 381 __u8 hw_src[ETH_ALEN];82 __u8 pa_src_zero;83 __be16 pa_src_net;84 __u8 pa_src_node;85 __u8 hw_dst[ETH_ALEN];86 __u8 pa_dst_zero;87 __be16 pa_dst_net;88 __u8 pa_dst_node;89} __attribute__ ((packed));90 91static __inline__ struct elapaarp *aarp_hdr(struct sk_buff *skb)92{93 return (struct elapaarp *)skb_transport_header(skb);94}95 96/* Not specified - how long till we drop a resolved entry */97#define AARP_EXPIRY_TIME (5 * 60 * HZ)98/* Size of hash table */99#define AARP_HASH_SIZE 16100/* Fast retransmission timer when resolving */101#define AARP_TICK_TIME (HZ / 5)102/* Send 10 requests then give up (2 seconds) */103#define AARP_RETRANSMIT_LIMIT 10104/*105 * Some value bigger than total retransmit time + a bit for last reply to106 * appear and to stop continual requests107 */108#define AARP_RESOLVE_TIME (10 * HZ)109 110extern struct datalink_proto *ddp_dl, *aarp_dl;111extern int aarp_proto_init(void);112 113/* Inter module exports */114 115/* Give a device find its atif control structure */116#if IS_ENABLED(CONFIG_ATALK)117static inline struct atalk_iface *atalk_find_dev(struct net_device *dev)118{119 return dev->atalk_ptr;120}121#endif122 123extern struct atalk_addr *atalk_find_dev_addr(struct net_device *dev);124extern struct net_device *atrtr_get_dev(struct atalk_addr *sa);125extern int aarp_send_ddp(struct net_device *dev,126 struct sk_buff *skb,127 struct atalk_addr *sa, void *hwaddr);128extern void aarp_device_down(struct net_device *dev);129extern void aarp_probe_network(struct atalk_iface *atif);130extern int aarp_proxy_probe_network(struct atalk_iface *atif,131 struct atalk_addr *sa);132extern void aarp_proxy_remove(struct net_device *dev,133 struct atalk_addr *sa);134 135extern void aarp_cleanup_module(void);136 137extern struct hlist_head atalk_sockets;138extern rwlock_t atalk_sockets_lock;139 140extern struct atalk_route *atalk_routes;141extern rwlock_t atalk_routes_lock;142 143extern struct atalk_iface *atalk_interfaces;144extern rwlock_t atalk_interfaces_lock;145 146extern struct atalk_route atrtr_default;147 148struct aarp_iter_state {149 int bucket;150 struct aarp_entry **table;151};152 153extern const struct seq_operations aarp_seq_ops;154 155extern int sysctl_aarp_expiry_time;156extern int sysctl_aarp_tick_time;157extern int sysctl_aarp_retransmit_limit;158extern int sysctl_aarp_resolve_time;159 160#ifdef CONFIG_SYSCTL161extern int atalk_register_sysctl(void);162extern void atalk_unregister_sysctl(void);163#else164static inline int atalk_register_sysctl(void)165{166 return 0;167}168static inline void atalk_unregister_sysctl(void)169{170}171#endif172 173#ifdef CONFIG_PROC_FS174extern int atalk_proc_init(void);175extern void atalk_proc_exit(void);176#else177static inline int atalk_proc_init(void)178{179 return 0;180}181static inline void atalk_proc_exit(void)182{183}184#endif /* CONFIG_PROC_FS */185 186#endif /* __LINUX_ATALK_H__ */187