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NetBSD/sys/netinet/ip_var.h

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/* $NetBSD: ip_var.h,v 1.91 2009/02/01 17:04:11 pooka Exp $ */
/*
* Copyright (c) 1982, 1986, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)ip_var.h 8.2 (Berkeley) 1/9/95
*/
#ifndef _NETINET_IP_VAR_H_
#define _NETINET_IP_VAR_H_
#include <sys/queue.h>
#include <net/route.h>
/*
* Overlay for ip header used by other protocols (tcp, udp).
*/
struct ipovly {
u_int8_t ih_x1[9]; /* (unused) */
u_int8_t ih_pr; /* protocol */
u_int16_t ih_len; /* protocol length */
struct in_addr ih_src; /* source internet address */
struct in_addr ih_dst; /* destination internet address */
} __packed;
/*
* Ip (reassembly or sequence) queue structures.
*
* XXX -- The following explains why the ipqe_m field is here, for TCP's use:
* We want to avoid doing m_pullup on incoming packets but that
* means avoiding dtom on the tcp reassembly code. That in turn means
* keeping an mbuf pointer in the reassembly queue (since we might
* have a cluster). As a quick hack, the source & destination
* port numbers (which are no longer needed once we've located the
* tcpcb) are overlayed with an mbuf pointer.
*/
TAILQ_HEAD(ipqehead, ipqent);
struct ipqent {
TAILQ_ENTRY(ipqent) ipqe_q;
union {
struct ip *_ip;
struct tcpiphdr *_tcp;
} _ipqe_u1;
struct mbuf *ipqe_m; /* point to first mbuf */
struct mbuf *ipre_mlast; /* point to last mbuf */
u_int8_t ipqe_mff; /* for IP fragmentation */
/*
* The following are used in TCP reassembly
*/
TAILQ_ENTRY(ipqent) ipqe_timeq;
u_int32_t ipqe_seq;
u_int32_t ipqe_len;
u_int32_t ipqe_flags;
};
#define ipqe_ip _ipqe_u1._ip
#define ipqe_tcp _ipqe_u1._tcp
/*
* 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 {
LIST_ENTRY(ipq) ipq_q; /* to other reass headers */
u_int8_t ipq_ttl; /* time for reass q to live */
u_int8_t ipq_p; /* protocol of this fragment */
u_int16_t ipq_id; /* sequence id for reassembly */
struct ipqehead ipq_fragq; /* to ip fragment queue */
struct in_addr ipq_src, ipq_dst;
u_int16_t ipq_nfrags; /* frags in this queue entry */
u_int8_t ipq_tos; /* TOS of this 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)
* is in m_len.
*/
#define MAX_IPOPTLEN 40
struct ipoption {
struct in_addr ipopt_dst; /* first-hop dst if source routed */
int8_t 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 ip_moptions {
struct ifnet *imo_multicast_ifp; /* ifp for outgoing multicasts */
struct in_addr imo_multicast_addr; /* ifindex/addr on MULTICAST_IF */
u_int8_t imo_multicast_ttl; /* TTL for outgoing multicasts */
u_int8_t imo_multicast_loop; /* 1 => hear sends if a member */
u_int16_t imo_num_memberships; /* no. memberships this socket */
struct in_multi *imo_membership[IP_MAX_MEMBERSHIPS];
};
/*
* IP statistics.
* Each counter is an unsigned 64-bit value.
*/
#define IP_STAT_TOTAL 0 /* total packets received */
#define IP_STAT_BADSUM 1 /* checksum bad */
#define IP_STAT_TOOSHORT 2 /* packet too short */
#define IP_STAT_TOOSMALL 3 /* not enough data */
#define IP_STAT_BADHLEN 4 /* ip header length < data size */
#define IP_STAT_BADLEN 5 /* ip length < ip header length */
#define IP_STAT_FRAGMENTS 6 /* fragments received */
#define IP_STAT_FRAGDROPPED 7 /* frags dropped (dups, out of space) */
#define IP_STAT_FRAGTIMEOUT 8 /* fragments timed out */
#define IP_STAT_FORWARD 9 /* packets forwarded */
#define IP_STAT_FASTFORWARD 10 /* packets fast forwarded */
#define IP_STAT_CANTFORWARD 11 /* packets rcvd for unreachable dest */
#define IP_STAT_REDIRECTSENT 12 /* packets forwareded on same net */
#define IP_STAT_NOPROTO 13 /* unknown or unsupported protocol */
#define IP_STAT_DELIVERED 14 /* datagrams delivered to upper level */
#define IP_STAT_LOCALOUT 15 /* total ip packets generated here */
#define IP_STAT_ODROPPED 16 /* lost packets due to nobufs, etc. */
#define IP_STAT_REASSEMBLED 17 /* total packets reassembled ok */
#define IP_STAT_FRAGMENTED 18 /* datagrams successfully fragmented */
#define IP_STAT_OFRAGMENTS 19 /* output fragments created */
#define IP_STAT_CANTFRAG 20 /* don't fragment flag was set, etc. */
#define IP_STAT_BADOPTIONS 21 /* error in option processing */
#define IP_STAT_NOROUTE 22 /* packets discarded due to no route */
#define IP_STAT_BADVERS 23 /* ip version != 4 */
#define IP_STAT_RAWOUT 24 /* total raw ip packets generated */
#define IP_STAT_BADFRAGS 25 /* malformed fragments (bad length) */
#define IP_STAT_RCVMEMDROP 26 /* frags dropped for lack of memory */
#define IP_STAT_TOOLONG 27 /* ip length > max ip packet size */
#define IP_STAT_NOGIF 28 /* no match gif found */
#define IP_STAT_BADADDR 29 /* invalid address on header */
#define IP_NSTATS 30
#ifdef _KERNEL
#ifdef _KERNEL_OPT
#include "opt_gateway.h"
#include "opt_mbuftrace.h"
#endif
/* 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_RETURNMTU 0x4 /* pass back mtu on EMSGSIZE */
#define IP_NOIPNEWID 0x8 /* don't fill in ip_id */
#define IP_ROUTETOIF SO_DONTROUTE /* bypass routing tables */
#define IP_ALLOWBROADCAST SO_BROADCAST /* can send broadcast packets */
#define IP_MTUDISC 0x0400 /* Path MTU Discovery; set DF */
extern struct domain inetdomain;
extern LIST_HEAD(ipqhead, ipq) ipq[]; /* ip reass. queue */
extern int ip_defttl; /* default IP ttl */
extern int ipforwarding; /* ip forwarding */
extern int ip_mtudisc; /* mtu discovery */
extern int ip_mtudisc_timeout; /* seconds to timeout mtu discovery */
extern int anonportmin; /* minimum ephemeral port */
extern int anonportmax; /* maximum ephemeral port */
extern int lowportmin; /* minimum reserved port */
extern int lowportmax; /* maximum reserved port */
extern int ip_do_loopback_cksum; /* do IP checksum on loopback? */
extern struct rttimer_queue *ip_mtudisc_timeout_q;
#ifdef MBUFTRACE
extern struct mowner ip_rx_mowner;
extern struct mowner ip_tx_mowner;
#endif
#ifdef GATEWAY
extern int ip_maxflows;
extern int ip_hashsize;
#endif
extern struct pool inmulti_pool;
extern struct pool ipqent_pool;
struct inpcb;
struct sockopt;
int ip_ctloutput(int, struct socket *, struct sockopt *);
int ip_dooptions(struct mbuf *);
void ip_drain(void);
void ip_forward(struct mbuf *, int);
void ip_freef(struct ipq *);
void ip_freemoptions(struct ip_moptions *);
int ip_getmoptions(struct ip_moptions *, struct sockopt *);
void ip_init(void);
int ip_optcopy(struct ip *, struct ip *);
u_int ip_optlen(struct inpcb *);
int ip_output(struct mbuf *, ...);
int ip_fragment(struct mbuf *, struct ifnet *, u_long);
int ip_pcbopts(struct mbuf **, const struct sockopt *);
struct mbuf *
ip_reass(struct ipqent *, struct ipq *, struct ipqhead *);
struct in_ifaddr *
ip_rtaddr(struct in_addr);
void ip_savecontrol(struct inpcb *, struct mbuf **, struct ip *,
struct mbuf *);
int ip_setmoptions(struct ip_moptions **, const struct sockopt *);
void ip_slowtimo(void);
struct mbuf *
ip_srcroute(void);
int ip_sysctl(int *, u_int, void *, size_t *, void *, size_t);
void ip_statinc(u_int);
void ipintr(void);
void * rip_ctlinput(int, const struct sockaddr *, void *);
int rip_ctloutput(int, struct socket *, struct sockopt *);
void rip_init(void);
void rip_input(struct mbuf *, ...);
int rip_output(struct mbuf *, ...);
int rip_usrreq(struct socket *,
int, struct mbuf *, struct mbuf *, struct mbuf *, struct lwp *);
int ipflow_init(int);
void ipflow_poolinit(void);
void ipflow_prune(void);
void ipflow_create(const struct route *, struct mbuf *);
void ipflow_slowtimo(void);
int ipflow_invalidate_all(int);
#endif /* _KERNEL */
#endif /* !_NETINET_IP_VAR_H_ */
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