* Copyright (c) 1982, 1986 Regents of the University of California.
* %sccs.include.redist.c%
* @(#)ip_var.h 7.10 (Berkeley) %G%
* Overlay for ip header used by other protocols (tcp, udp).
caddr_t ih_next
, ih_prev
; /* for protocol sequence q's */
u_char ih_x1
; /* (unused) */
u_char ih_pr
; /* protocol */
short ih_len
; /* protocol length */
struct in_addr ih_src
; /* source internet address */
struct in_addr ih_dst
; /* destination internet address */
* Ip reassembly queue structure. Each fragment
* being reassembled is attached to one of these structures.
* They are timed out after ipq_ttl drops to 0, and may also
* be reclaimed if memory becomes tight.
struct ipq
*next
,*prev
; /* to other reass headers */
u_char ipq_ttl
; /* time for reass q to live */
u_char ipq_p
; /* protocol of this fragment */
u_short ipq_id
; /* sequence id for reassembly */
struct ipasfrag
*ipq_next
,*ipq_prev
;
/* to ip headers of fragments */
struct in_addr ipq_src
,ipq_dst
;
* Ip header, when holding a fragment.
* Note: ipf_next must be at same offset as ipq_next above
#if BYTE_ORDER == LITTLE_ENDIAN
#if BYTE_ORDER == BIG_ENDIAN
u_char ipf_mff
; /* XXX overlays ip_tos: use low bit
* to avoid destroying tos;
* copied from (ip_off&IP_MF) */
struct ipasfrag
*ipf_next
; /* next fragment */
struct ipasfrag
*ipf_prev
; /* previous fragment */
* Structure stored in mbuf in inpcb.ip_options
* and passed to ip_output when ip options are in use.
* The actual length of the options (including ipopt_dst)
struct in_addr ipopt_dst
; /* first-hop dst if source routed */
char ipopt_list
[MAX_IPOPTLEN
]; /* options proper */
* Structure attached to inpcb.ip_moptions and
* passed to ip_output when IP multicast options are in use.
struct ifnet
*imo_multicast_ifp
; /* ifp for outgoing multicasts */
u_char imo_multicast_ttl
; /* TTL for outgoing multicasts */
u_char imo_multicast_loop
; /* 1 => hear sends if a member */
u_short imo_num_memberships
; /* no. memberships this socket */
struct in_multi
*imo_membership
[IP_MAX_MEMBERSHIPS
];
u_long ips_total
; /* total packets received */
u_long ips_badsum
; /* checksum bad */
u_long ips_tooshort
; /* packet too short */
u_long ips_toosmall
; /* not enough data */
u_long ips_badhlen
; /* ip header length < data size */
u_long ips_badlen
; /* ip length < ip header length */
u_long ips_fragments
; /* fragments received */
u_long ips_fragdropped
; /* frags dropped (dups, out of space) */
u_long ips_fragtimeout
; /* fragments timed out */
u_long ips_forward
; /* packets forwarded */
u_long ips_cantforward
; /* packets rcvd for unreachable dest */
u_long ips_redirectsent
; /* packets forwarded on same net */
u_long ips_noproto
; /* unknown or unsupported protocol */
u_long ips_delivered
; /* datagrams delivered to upper level*/
u_long ips_localout
; /* total ip packets generated here */
u_long ips_odropped
; /* lost packets due to nobufs, etc. */
u_long ips_reassembled
; /* total packets reassembled ok */
u_long ips_fragmented
; /* datagrams sucessfully fragmented */
u_long ips_ofragments
; /* output fragments created */
u_long ips_cantfrag
; /* don't fragment flag was set, etc. */
u_long ips_badoptions
; /* error in option processing */
u_long ips_noroute
; /* packets discarded due to no route */
u_long ips_badvers
; /* ip version != 4 */
u_long ips_rawout
; /* total raw ip packets generated */
/* flags passed to ip_output as last parameter */
#define IP_FORWARDING 0x1 /* most of ip header exists */
#define IP_RAWOUTPUT 0x2 /* raw ip header exists */
#define IP_ROUTETOIF SO_DONTROUTE /* bypass routing tables */
#define IP_ALLOWBROADCAST SO_BROADCAST /* can send broadcast packets */
struct ipq ipq
; /* ip reass. queue */
u_short ip_id
; /* ip packet ctr, for ids */
struct mbuf
*ip_srcroute();