ip.h

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/*
** ipv4.h 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 10:51:14 2004 Arthur Kopatsy
** Last update Fri Dec 17 09:49:51 2004 Arthur Kopatsy
*/

#ifndef IP_H_
#define IP_H_

#define IP_HEADER_LEN           20

#define IP_V4           4
#define IP_V6           6

#define IP_TTL          63

#define IP_FL_MOREFRAG  0x2000
#define IP_FL_DONTFRAG  0x4000

#define IP_OFFMASK      0x1fff
#define IP_FLGMASK      0xe000
#define IP_OFF          0x1fff

struct s_ip_hdr
{
#if 1                   /* Little indian */
  u_int32_t             ip_hl : 4;
  u_int32_t             ip_v : 4;
#else
  u_int32_t             ip_v : 4;
  u_int32_t             ip_hl : 4;
#endif
  u_int8_t              ip_tos;
  u_int16_t             ip_len;
  u_int16_t             ip_id;
  u_int16_t             ip_off;
  u_int8_t              ip_ttl;
  u_int8_t              ip_p;
  u_int16_t             ip_sum;
  struct in_addr        ip_src;
  struct in_addr        ip_dst;
} __attribute__ ((__packed__));

/* UDP pseudo header for ckecksum computing */
struct s_phdr
{
  struct in_addr        ph_src;
  struct in_addr        ph_dst;
#if 1                   /* Little indian */
  u_int8_t              ph_zero;
  u_int8_t              ph_p;
#else
  u_int8_t              ph_p;
  u_int8_t              ph_zero;
#endif
  u_int16_t             ph_len;  
};

#ifdef __INET__

#define IP_FRAG_TTL             (60 * 1000000)

struct s_frag_pk
{
  LIST_ENTRY(s_frag_pk)         frp_next;
  struct in_addr                frp_src;
  u_int16_t                     frp_id;
  int                           frp_last;
  size_t                        frp_size;
  int64_t                       frp_timer;
  struct s_pkbuf                *frp_pk;
};

struct s_ip_proto_info
{
  LIST_HEAD(s_frag_pks, s_frag_pk)      in_frag_pks;            /* List of waiting fragmented pk */
  int                                   in_id;                  /* Incremental id */
};

#endif

/* PROTO ip.c */
#ifdef __INET__
/* ip.c */
int ip_proto_init(void);
void ip_dump(struct s_pkbuf *pk);
int ip_output(struct s_pkbuf *pk);
int ip_fragment_input(struct s_pkbuf *pk);
int aa_ip_input(struct s_pkbuf *pk);
#endif /* __INET__ */
#endif

---