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NetBSD/sys/netinet/in_var.h

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/* $NetBSD: in_var.h,v 1.70 2014/07/01 05:49:18 rtr Exp $ */
/*-
* Copyright (c) 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Public Access Networks Corporation ("Panix"). It was developed under
* contract to Panix by Eric Haszlakiewicz and Thor Lancelot Simon.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
/*
* Copyright (c) 1985, 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.
*
* @(#)in_var.h 8.2 (Berkeley) 1/9/95
*/
#ifndef _NETINET_IN_VAR_H_
#define _NETINET_IN_VAR_H_
#include <sys/queue.h>
/*
* Interface address, Internet version. One of these structures
* is allocated for each interface with an Internet address.
* The ifaddr structure contains the protocol-independent part
* of the structure and is assumed to be first.
*/
struct in_ifaddr {
struct ifaddr ia_ifa; /* protocol-independent info */
#define ia_ifp ia_ifa.ifa_ifp
#define ia_flags ia_ifa.ifa_flags
/* ia_{,sub}net{,mask} in host order */
u_int32_t ia_net; /* network number of interface */
u_int32_t ia_netmask; /* mask of net part */
u_int32_t ia_subnet; /* subnet number, including net */
u_int32_t ia_subnetmask; /* mask of subnet part */
struct in_addr ia_netbroadcast; /* to recognize net broadcasts */
LIST_ENTRY(in_ifaddr) ia_hash; /* entry in bucket of inet addresses */
TAILQ_ENTRY(in_ifaddr) ia_list; /* list of internet addresses */
struct sockaddr_in ia_addr; /* reserve space for interface name */
struct sockaddr_in ia_dstaddr; /* reserve space for broadcast addr */
#define ia_broadaddr ia_dstaddr
struct sockaddr_in ia_sockmask; /* reserve space for general netmask */
LIST_HEAD(, in_multi) ia_multiaddrs; /* list of multicast addresses */
struct in_multi *ia_allhosts; /* multicast address record for
the allhosts multicast group */
uint16_t ia_idsalt; /* ip_id salt for this ia */
};
struct in_aliasreq {
char ifra_name[IFNAMSIZ]; /* if name, e.g. "en0" */
struct sockaddr_in ifra_addr;
struct sockaddr_in ifra_dstaddr;
#define ifra_broadaddr ifra_dstaddr
struct sockaddr_in ifra_mask;
};
/*
* Given a pointer to an in_ifaddr (ifaddr),
* return a pointer to the addr as a sockaddr_in.
*/
#define IA_SIN(ia) (&(((struct in_ifaddr *)(ia))->ia_addr))
#ifdef _KERNEL
/* Note: 61, 127, 251, 509, 1021, 2039 are good. */
#ifndef IN_IFADDR_HASH_SIZE
#define IN_IFADDR_HASH_SIZE 509
#endif
/*
* This is a bit unconventional, and wastes a little bit of space, but
* because we want a very even hash function we don't use & in_ifaddrhash
* here, but rather % the hash size, which should obviously be prime.
*/
#define IN_IFADDR_HASH(x) in_ifaddrhashtbl[(u_long)(x) % IN_IFADDR_HASH_SIZE]
LIST_HEAD(in_ifaddrhashhead, in_ifaddr); /* Type of the hash head */
TAILQ_HEAD(in_ifaddrhead, in_ifaddr); /* Type of the list head */
extern u_long in_ifaddrhash; /* size of hash table - 1 */
extern struct in_ifaddrhashhead *in_ifaddrhashtbl; /* Hash table head */
extern struct in_ifaddrhead in_ifaddrhead; /* List head (in ip_input) */
extern const int inetctlerrmap[];
/*
* Macro for finding whether an internet address (in_addr) belongs to one
* of our interfaces (in_ifaddr). NULL if the address isn't ours.
*/
#define INADDR_TO_IA(addr, ia) \
/* struct in_addr addr; */ \
/* struct in_ifaddr *ia; */ \
{ \
LIST_FOREACH(ia, &IN_IFADDR_HASH((addr).s_addr), ia_hash) { \
if (in_hosteq(ia->ia_addr.sin_addr, (addr))) \
break; \
} \
}
/*
* Macro for finding the next in_ifaddr structure with the same internet
* address as ia. Call only with a valid ia pointer.
* Will set ia to NULL if none found.
*/
#define NEXT_IA_WITH_SAME_ADDR(ia) \
/* struct in_ifaddr *ia; */ \
{ \
struct in_addr addr; \
addr = ia->ia_addr.sin_addr; \
do { \
ia = LIST_NEXT(ia, ia_hash); \
} while ((ia != NULL) && !in_hosteq(ia->ia_addr.sin_addr, addr)); \
}
/*
* Macro for finding the interface (ifnet structure) corresponding to one
* of our IP addresses.
*/
#define INADDR_TO_IFP(addr, ifp) \
/* struct in_addr addr; */ \
/* struct ifnet *ifp; */ \
{ \
struct in_ifaddr *ia; \
\
INADDR_TO_IA(addr, ia); \
(ifp) = (ia == NULL) ? NULL : ia->ia_ifp; \
}
/*
* Macro for finding an internet address structure (in_ifaddr) corresponding
* to a given interface (ifnet structure).
*/
#define IFP_TO_IA(ifp, ia) \
/* struct ifnet *ifp; */ \
/* struct in_ifaddr *ia; */ \
{ \
struct ifaddr *ifa; \
\
IFADDR_FOREACH(ifa, ifp) { \
if (ifa->ifa_addr->sa_family == AF_INET) \
break; \
} \
(ia) = ifatoia(ifa); \
}
#endif
/*
* Internet multicast address structure. There is one of these for each IP
* multicast group to which this host belongs on a given network interface.
* They are kept in a linked list, rooted in the interface's in_ifaddr
* structure.
*/
struct router_info;
struct in_multi {
LIST_ENTRY(in_multi) inm_list; /* list of multicast addresses */
struct router_info *inm_rti; /* router version info */
struct ifnet *inm_ifp; /* back pointer to ifnet */
struct in_addr inm_addr; /* IP multicast address */
u_int inm_refcount; /* no. membership claims by sockets */
u_int inm_timer; /* IGMP membership report timer */
u_int inm_state; /* state of membership */
};
#ifdef _KERNEL
#include <net/pktqueue.h>
extern pktqueue_t *ip_pktq;
/*
* Structure used by functions below to remember position when stepping
* through all of the in_multi records.
*/
struct in_multistep {
int i_n;
struct in_multi *i_inm;
};
bool in_multi_group(struct in_addr, struct ifnet *, int);
struct in_multi *in_first_multi(struct in_multistep *);
struct in_multi *in_next_multi(struct in_multistep *);
struct in_multi *in_lookup_multi(struct in_addr, struct ifnet *);
struct in_multi *in_addmulti(struct in_addr *, struct ifnet *);
void in_delmulti(struct in_multi *);
void in_multi_lock(int);
void in_multi_unlock(void);
int in_multi_lock_held(void);
struct ifaddr;
int in_ifinit(struct ifnet *,
struct in_ifaddr *, const struct sockaddr_in *, int);
void in_savemkludge(struct in_ifaddr *);
void in_restoremkludge(struct in_ifaddr *, struct ifnet *);
void in_purgemkludge(struct ifnet *);
void in_ifscrub(struct ifnet *, struct in_ifaddr *);
void in_setmaxmtu(void);
const char *in_fmtaddr(struct in_addr);
int in_control(struct socket *, u_long, void *, struct ifnet *);
void in_purgeaddr(struct ifaddr *);
void in_purgeif(struct ifnet *);
int ipflow_fastforward(struct mbuf *);
struct ipid_state;
typedef struct ipid_state ipid_state_t;
ipid_state_t * ip_id_init(void);
void ip_id_fini(ipid_state_t *);
uint16_t ip_randomid(ipid_state_t *, uint16_t);
extern ipid_state_t * ip_ids;
extern uint16_t ip_id;
extern int ip_do_randomid;
/*
* ip_newid_range: "allocate" num contiguous IP IDs.
*
* => Return the first ID.
*/
static __inline uint16_t
ip_newid_range(const struct in_ifaddr *ia, u_int num)
{
uint16_t id;
if (ip_do_randomid) {
/* XXX ignore num */
return ip_randomid(ip_ids, ia ? ia->ia_idsalt : 0);
}
/* Never allow an IP ID of 0 (detect wrap). */
if ((uint16_t)(ip_id + num) < ip_id) {
ip_id = 1;
}
id = htons(ip_id);
ip_id += num;
return id;
}
static __inline uint16_t
ip_newid(const struct in_ifaddr *ia)
{
return ip_newid_range(ia, 1);
}
#ifdef SYSCTLFN_PROTO
int sysctl_inpcblist(SYSCTLFN_PROTO);
#endif
#endif /* !_KERNEL */
/* INET6 stuff */
#include <netinet6/in6_var.h>
#endif /* !_NETINET_IN_VAR_H_ */
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