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NetBSD/sys/netinet/ip_var.h
ozaki-r 4c25fb2f83 Add rtcache_unref to release points of rtentry stemming from rtcache 
In the MP-safe world, a rtentry stemming from a rtcache can be freed at any
points. So we need to protect rtentries somehow say by reference couting or
passive references. Regardless of the method, we need to call some release
function of a rtentry after using it.

The change adds a new function rtcache_unref to release a rtentry. At this
point, this function does nothing because for now we don't add a reference
to a rtentry when we get one from a rtcache. We will add something useful
in a further commit.

This change is a part of changes for MP-safe routing table. It is separated
to avoid one big change that makes difficult to debug by bisecting.
2016-12-08 05:16:33 +00:00

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/* $NetBSD: ip_var.h,v 1.116 2016/12/08 05:16:33 ozaki-r 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 Flow structure
*/
struct ipflow {
TAILQ_ENTRY(ipflow) ipf_list; /* next in active list */
TAILQ_ENTRY(ipflow) ipf_hash; /* next ipflow in bucket */
size_t ipf_hashidx; /* own hash index of ipflowtable[] */
struct in_addr ipf_dst; /* destination address */
struct in_addr ipf_src; /* source address */
uint8_t ipf_tos; /* type-of-service */
struct route ipf_ro; /* associated route entry */
u_long ipf_uses; /* number of uses in this period */
u_long ipf_last_uses; /* number of uses in last period */
u_long ipf_dropped; /* ENOBUFS retured by if_output */
u_long ipf_errors; /* other errors returned by if_output */
u_int ipf_timer; /* lifetime timer */
};
/*
* IP sequence queue structure.
*
* 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_tcp _ipqe_u1._tcp
/*
* 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 {
if_index_t imo_multicast_if_index; /* I/F 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
/*
* The following flags can be passed to ip_output() as last parameter
*/
#define IP_FORWARDING 0x0001 /* most of ip header exists */
#define IP_RAWOUTPUT 0x0002 /* raw ip header exists */
#define IP_RETURNMTU 0x0004 /* pass back mtu on EMSGSIZE */
#define IP_NOIPNEWID 0x0008 /* don't fill in ip_id */
__CTASSERT(SO_DONTROUTE == 0x0010);
__CTASSERT(SO_BROADCAST == 0x0020);
#define IP_ROUTETOIF SO_DONTROUTE /* bypass routing tables */
#define IP_ALLOWBROADCAST SO_BROADCAST /* can send broadcast packets */
#define IP_IGMP_MCAST 0x0040 /* IGMP for mcast join/leave */
#define IP_MTUDISC 0x0400 /* Path MTU Discovery; set DF */
extern struct domain inetdomain;
extern const struct pr_usrreqs rip_usrreqs;
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
struct inpcb;
struct sockopt;
void ip_init(void);
void in_init(void);
int ip_ctloutput(int, struct socket *, struct sockopt *);
void ip_drain(void);
void ip_drainstub(void);
void ip_freemoptions(struct ip_moptions *);
int ip_optcopy(struct ip *, struct ip *);
u_int ip_optlen(struct inpcb *);
int ip_output(struct mbuf *, struct mbuf *, struct route *, int,
struct ip_moptions *, struct socket *);
int ip_fragment(struct mbuf *, struct ifnet *, u_long);
void ip_reass_init(void);
int ip_reass_packet(struct mbuf **, struct ip *);
void ip_reass_slowtimo(void);
void ip_reass_drain(void);
void ip_savecontrol(struct inpcb *, struct mbuf **, struct ip *,
struct mbuf *);
void ip_slowtimo(void);
void ip_fasttimo(void);
struct mbuf *
ip_srcroute(void);
int ip_sysctl(int *, u_int, void *, size_t *, void *, size_t);
void ip_statinc(u_int);
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 *, struct inpcb *);
int rip_usrreq(struct socket *,
int, struct mbuf *, struct mbuf *, struct mbuf *, struct lwp *);
int ip_setmoptions(struct ip_moptions **, const struct sockopt *sopt);
int ip_getmoptions(struct ip_moptions *, struct sockopt *sopt);
int ip_if_output(struct ifnet * const, struct mbuf * const,
const struct sockaddr * const, const struct rtentry *);
/* IP Flow interface. */
void ipflow_init(void);
void ipflow_poolinit(void);
void ipflow_create(struct route *, struct mbuf *);
void ipflow_slowtimo(void);
int ipflow_invalidate_all(int);
#endif /* _KERNEL */
#endif /* !_NETINET_IP_VAR_H_ */
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