arp.h

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/*
** ip.c for  in /home/anoman/work/lse/atomix/lseos-net/inet
** 
** Copyright (c)2004 Arthur Kopatsy
** Login   <kopats_a@epita.fr>
** 
** Started on  Thu Aug 26 10:46:18 2004 Arthur Kopatsy
** Last update Wed Dec  1 16:49:44 2004 Arthur Kopatsy
*/

#ifndef ARP_H_
#define ARP_H_

#define ARP_HEADER_LEN          28

#define ARP_HARD_TYPE_ETHERNET  0x0001
#define ARP_PROT_TYPE_IP        0x0800

#define ARP_OP_REQUEST          1
#define ARP_OP_ANSWER           2

struct s_arp_hdr
{
  u_int16_t                     arp_h; /* Hardware type */
  u_int16_t                     arp_p; /* Protocol */
#if 1   /* Little Indian */
  u_int8_t                      arp_hs; /* Harware size */
  u_int8_t                      arp_ps; /* Protocol size */
#else
  u_int8_t                      arp_ps; /* Protocol size */
  u_int8_t                      arp_hs; /* Harware size */
#endif
  u_int16_t                     arp_op;

  struct mac_addr               arp_sha; /* Sender harware addr */
  struct in_addr                arp_spa; /* Sender protocole addr */
  struct mac_addr               arp_tha; /* Target harware addr */
  struct in_addr                arp_tpa; /* Target protocol addr */
} __attribute__ ((__packed__));

#ifdef __INET__
struct s_arp_entry
{
  LIST_ENTRY(s_arp_entry)       next;
  struct in_addr                in_addr;
  struct mac_addr               mac_addr;

  int                           resolved;

  int64_t                       timer_id;

  struct s_pkq                  waiting_pk;  
};

LIST_HEAD(s_arp_cache, s_arp_entry);

struct s_arp_proto_info
{
  struct s_arp_cache    arp_cache;
  int                   arp_cache_lock;
};

int                     arp_proto_init(void);

/* Arp timer actions */
#define ARP_LIFE_TIME           (20*60*1000000) /* 2 minutes of validity */
#define ARP_RQST_TIMEOUT        (5*1000000)     /* After 5s wating packet are freed */

#endif

/* PROTO arp.c */
#ifdef __INET__
/* arp.c */
int arp_proto_init(void);
void arp_request_timeout(struct s_arp_entry *entry);
void arp_invalid_entry(struct s_arp_entry *entry);
void arp_entry_remove(struct s_arp_entry *entry);
void arp_dump(struct s_pkbuf *pk);
int arp_request_haddr(struct s_pkbuf *pk, struct mac_addr *mac_addr);
int aa_arp_input(struct s_pkbuf *pk);
#endif /* __INET__ */
#endif

---