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| Current File : //sys/netinet/in_var.h |
/*-
* 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.
* 4. 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
* $FreeBSD: release/9.1.0/sys/netinet/in_var.h 238713 2012-07-23 09:19:14Z glebius $
*/
#ifndef _NETINET_IN_VAR_H_
#define _NETINET_IN_VAR_H_
#include <sys/queue.h>
#include <sys/fnv_hash.h>
#include <sys/tree.h>
struct igmp_ifinfo;
struct in_multi;
struct lltable;
/*
* IPv4 per-interface state.
*/
struct in_ifinfo {
struct lltable *ii_llt; /* ARP state */
struct igmp_ifinfo *ii_igmp; /* IGMP state */
struct in_multi *ii_allhosts; /* 224.0.0.1 membership */
};
/*
* Interface address, Internet version. One of these structures
* is allocated for each Internet address on an interface.
* 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_subnet{,mask} in host order */
u_long ia_subnet; /* subnet address */
u_long ia_subnetmask; /* mask of subnet */
LIST_ENTRY(in_ifaddr) ia_hash; /* entry in bucket of inet addresses */
TAILQ_ENTRY(in_ifaddr) ia_link; /* 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 */
};
struct in_aliasreq {
char ifra_name[IFNAMSIZ]; /* if name, e.g. "en0" */
struct sockaddr_in ifra_addr;
struct sockaddr_in ifra_broadaddr;
#define ifra_dstaddr ifra_broadaddr
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))
#define IA_DSTSIN(ia) (&(((struct in_ifaddr *)(ia))->ia_dstaddr))
#define IN_LNAOF(in, ifa) \
((ntohl((in).s_addr) & ~((struct in_ifaddr *)(ifa)->ia_subnetmask))
#ifdef _KERNEL
extern u_char inetctlerrmap[];
#define LLTABLE(ifp) \
((struct in_ifinfo *)(ifp)->if_afdata[AF_INET])->ii_llt
/*
* Hash table for IP addresses.
*/
TAILQ_HEAD(in_ifaddrhead, in_ifaddr);
LIST_HEAD(in_ifaddrhashhead, in_ifaddr);
VNET_DECLARE(struct in_ifaddrhashhead *, in_ifaddrhashtbl);
VNET_DECLARE(struct in_ifaddrhead, in_ifaddrhead);
VNET_DECLARE(u_long, in_ifaddrhmask); /* mask for hash table */
#define V_in_ifaddrhashtbl VNET(in_ifaddrhashtbl)
#define V_in_ifaddrhead VNET(in_ifaddrhead)
#define V_in_ifaddrhmask VNET(in_ifaddrhmask)
#define INADDR_NHASH_LOG2 9
#define INADDR_NHASH (1 << INADDR_NHASH_LOG2)
#define INADDR_HASHVAL(x) fnv_32_buf((&(x)), sizeof(x), FNV1_32_INIT)
#define INADDR_HASH(x) \
(&V_in_ifaddrhashtbl[INADDR_HASHVAL(x) & V_in_ifaddrhmask])
extern struct rwlock in_ifaddr_lock;
#define IN_IFADDR_LOCK_ASSERT() rw_assert(&in_ifaddr_lock, RA_LOCKED)
#define IN_IFADDR_RLOCK() rw_rlock(&in_ifaddr_lock)
#define IN_IFADDR_RLOCK_ASSERT() rw_assert(&in_ifaddr_lock, RA_RLOCKED)
#define IN_IFADDR_RUNLOCK() rw_runlock(&in_ifaddr_lock)
#define IN_IFADDR_WLOCK() rw_wlock(&in_ifaddr_lock)
#define IN_IFADDR_WLOCK_ASSERT() rw_assert(&in_ifaddr_lock, RA_WLOCKED)
#define IN_IFADDR_WUNLOCK() rw_wunlock(&in_ifaddr_lock)
/*
* Macro for finding the internet address structure (in_ifaddr)
* corresponding to one of our IP addresses (in_addr).
*/
#define INADDR_TO_IFADDR(addr, ia) \
/* struct in_addr addr; */ \
/* struct in_ifaddr *ia; */ \
do { \
\
LIST_FOREACH(ia, INADDR_HASH((addr).s_addr), ia_hash) \
if (IA_SIN(ia)->sin_addr.s_addr == (addr).s_addr) \
break; \
} while (0)
/*
* 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_IFADDR(addr, ia); \
(ifp) = (ia == NULL) ? NULL : ia->ia_ifp; \
}
/*
* Macro for finding the 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; */ \
do { \
IN_IFADDR_RLOCK(); \
for ((ia) = TAILQ_FIRST(&V_in_ifaddrhead); \
(ia) != NULL && (ia)->ia_ifp != (ifp); \
(ia) = TAILQ_NEXT((ia), ia_link)) \
continue; \
if ((ia) != NULL) \
ifa_ref(&(ia)->ia_ifa); \
IN_IFADDR_RUNLOCK(); \
} while (0)
#endif
/*
* IP datagram reassembly.
*/
#define IPREASS_NHASH_LOG2 6
#define IPREASS_NHASH (1 << IPREASS_NHASH_LOG2)
#define IPREASS_HMASK (IPREASS_NHASH - 1)
#define IPREASS_HASH(x,y) \
(((((x) & 0xF) | ((((x) >> 8) & 0xF) << 4)) ^ (y)) & IPREASS_HMASK)
/*
* Legacy IPv4 IGMP per-link structure.
*/
struct router_info {
struct ifnet *rti_ifp;
int rti_type; /* type of router which is querier on this interface */
int rti_time; /* # of slow timeouts since last old query */
SLIST_ENTRY(router_info) rti_list;
};
/*
* Per-interface IGMP router version information.
*/
struct igmp_ifinfo {
LIST_ENTRY(igmp_ifinfo) igi_link;
struct ifnet *igi_ifp; /* interface this instance belongs to */
uint32_t igi_version; /* IGMPv3 Host Compatibility Mode */
uint32_t igi_v1_timer; /* IGMPv1 Querier Present timer (s) */
uint32_t igi_v2_timer; /* IGMPv2 Querier Present timer (s) */
uint32_t igi_v3_timer; /* IGMPv3 General Query (interface) timer (s)*/
uint32_t igi_flags; /* IGMP per-interface flags */
uint32_t igi_rv; /* IGMPv3 Robustness Variable */
uint32_t igi_qi; /* IGMPv3 Query Interval (s) */
uint32_t igi_qri; /* IGMPv3 Query Response Interval (s) */
uint32_t igi_uri; /* IGMPv3 Unsolicited Report Interval (s) */
SLIST_HEAD(,in_multi) igi_relinmhead; /* released groups */
struct ifqueue igi_gq; /* queue of general query responses */
};
#define IGIF_SILENT 0x00000001 /* Do not use IGMP on this ifp */
#define IGIF_LOOPBACK 0x00000002 /* Send IGMP reports to loopback */
/*
* IPv4 multicast IGMP-layer source entry.
*/
struct ip_msource {
RB_ENTRY(ip_msource) ims_link; /* RB tree links */
in_addr_t ims_haddr; /* host byte order */
struct ims_st {
uint16_t ex; /* # of exclusive members */
uint16_t in; /* # of inclusive members */
} ims_st[2]; /* state at t0, t1 */
uint8_t ims_stp; /* pending query */
};
/*
* IPv4 multicast PCB-layer source entry.
*/
struct in_msource {
RB_ENTRY(ip_msource) ims_link; /* RB tree links */
in_addr_t ims_haddr; /* host byte order */
uint8_t imsl_st[2]; /* state before/at commit */
};
RB_HEAD(ip_msource_tree, ip_msource); /* define struct ip_msource_tree */
static __inline int
ip_msource_cmp(const struct ip_msource *a, const struct ip_msource *b)
{
if (a->ims_haddr < b->ims_haddr)
return (-1);
if (a->ims_haddr == b->ims_haddr)
return (0);
return (1);
}
RB_PROTOTYPE(ip_msource_tree, ip_msource, ims_link, ip_msource_cmp);
/*
* IPv4 multicast PCB-layer group filter descriptor.
*/
struct in_mfilter {
struct ip_msource_tree imf_sources; /* source list for (S,G) */
u_long imf_nsrc; /* # of source entries */
uint8_t imf_st[2]; /* state before/at commit */
};
/*
* IPv4 group descriptor.
*
* For every entry on an ifnet's if_multiaddrs list which represents
* an IP multicast group, there is one of these structures.
*
* If any source filters are present, then a node will exist in the RB-tree
* to permit fast lookup by source whenever an operation takes place.
* This permits pre-order traversal when we issue reports.
* Source filter trees are kept separately from the socket layer to
* greatly simplify locking.
*
* When IGMPv3 is active, inm_timer is the response to group query timer.
* The state-change timer inm_sctimer is separate; whenever state changes
* for the group the state change record is generated and transmitted,
* and kept if retransmissions are necessary.
*
* FUTURE: inm_link is now only used when groups are being purged
* on a detaching ifnet. It could be demoted to a SLIST_ENTRY, but
* because it is at the very start of the struct, we can't do this
* w/o breaking the ABI for ifmcstat.
*/
struct in_multi {
LIST_ENTRY(in_multi) inm_link; /* to-be-released by in_ifdetach */
struct in_addr inm_addr; /* IP multicast address, convenience */
struct ifnet *inm_ifp; /* back pointer to ifnet */
struct ifmultiaddr *inm_ifma; /* back pointer to ifmultiaddr */
u_int inm_timer; /* IGMPv1/v2 group / v3 query timer */
u_int inm_state; /* state of the membership */
void *inm_rti; /* unused, legacy field */
u_int inm_refcount; /* reference count */
/* New fields for IGMPv3 follow. */
struct igmp_ifinfo *inm_igi; /* IGMP info */
SLIST_ENTRY(in_multi) inm_nrele; /* to-be-released by IGMP */
struct ip_msource_tree inm_srcs; /* tree of sources */
u_long inm_nsrc; /* # of tree entries */
struct ifqueue inm_scq; /* queue of pending
* state-change packets */
struct timeval inm_lastgsrtv; /* Time of last G-S-R query */
uint16_t inm_sctimer; /* state-change timer */
uint16_t inm_scrv; /* state-change rexmit count */
/*
* SSM state counters which track state at T0 (the time the last
* state-change report's RV timer went to zero) and T1
* (time of pending report, i.e. now).
* Used for computing IGMPv3 state-change reports. Several refcounts
* are maintained here to optimize for common use-cases.
*/
struct inm_st {
uint16_t iss_fmode; /* IGMP filter mode */
uint16_t iss_asm; /* # of ASM listeners */
uint16_t iss_ex; /* # of exclusive members */
uint16_t iss_in; /* # of inclusive members */
uint16_t iss_rec; /* # of recorded sources */
} inm_st[2]; /* state at t0, t1 */
};
/*
* Helper function to derive the filter mode on a source entry
* from its internal counters. Predicates are:
* A source is only excluded if all listeners exclude it.
* A source is only included if no listeners exclude it,
* and at least one listener includes it.
* May be used by ifmcstat(8).
*/
static __inline uint8_t
ims_get_mode(const struct in_multi *inm, const struct ip_msource *ims,
uint8_t t)
{
t = !!t;
if (inm->inm_st[t].iss_ex > 0 &&
inm->inm_st[t].iss_ex == ims->ims_st[t].ex)
return (MCAST_EXCLUDE);
else if (ims->ims_st[t].in > 0 && ims->ims_st[t].ex == 0)
return (MCAST_INCLUDE);
return (MCAST_UNDEFINED);
}
#ifdef _KERNEL
#ifdef SYSCTL_DECL
SYSCTL_DECL(_net_inet);
SYSCTL_DECL(_net_inet_ip);
SYSCTL_DECL(_net_inet_raw);
#endif
/*
* Lock macros for IPv4 layer multicast address lists. IPv4 lock goes
* before link layer multicast locks in the lock order. In most cases,
* consumers of IN_*_MULTI() macros should acquire the locks before
* calling them; users of the in_{add,del}multi() functions should not.
*/
extern struct mtx in_multi_mtx;
#define IN_MULTI_LOCK() mtx_lock(&in_multi_mtx)
#define IN_MULTI_UNLOCK() mtx_unlock(&in_multi_mtx)
#define IN_MULTI_LOCK_ASSERT() mtx_assert(&in_multi_mtx, MA_OWNED)
#define IN_MULTI_UNLOCK_ASSERT() mtx_assert(&in_multi_mtx, MA_NOTOWNED)
/*
* Function for looking up an in_multi record for an IPv4 multicast address
* on a given interface. ifp must be valid. If no record found, return NULL.
* The IN_MULTI_LOCK and IF_ADDR_LOCK on ifp must be held.
*/
static __inline struct in_multi *
inm_lookup_locked(struct ifnet *ifp, const struct in_addr ina)
{
struct ifmultiaddr *ifma;
struct in_multi *inm;
IN_MULTI_LOCK_ASSERT();
IF_ADDR_LOCK_ASSERT(ifp);
inm = NULL;
TAILQ_FOREACH(ifma, &((ifp)->if_multiaddrs), ifma_link) {
if (ifma->ifma_addr->sa_family == AF_INET) {
inm = (struct in_multi *)ifma->ifma_protospec;
if (inm->inm_addr.s_addr == ina.s_addr)
break;
inm = NULL;
}
}
return (inm);
}
/*
* Wrapper for inm_lookup_locked().
* The IF_ADDR_LOCK will be taken on ifp and released on return.
*/
static __inline struct in_multi *
inm_lookup(struct ifnet *ifp, const struct in_addr ina)
{
struct in_multi *inm;
IN_MULTI_LOCK_ASSERT();
IF_ADDR_RLOCK(ifp);
inm = inm_lookup_locked(ifp, ina);
IF_ADDR_RUNLOCK(ifp);
return (inm);
}
/* Acquire an in_multi record. */
static __inline void
inm_acquire_locked(struct in_multi *inm)
{
IN_MULTI_LOCK_ASSERT();
++inm->inm_refcount;
}
/*
* Return values for imo_multi_filter().
*/
#define MCAST_PASS 0 /* Pass */
#define MCAST_NOTGMEMBER 1 /* This host not a member of group */
#define MCAST_NOTSMEMBER 2 /* This host excluded source */
#define MCAST_MUTED 3 /* [deprecated] */
struct rtentry;
struct route;
struct ip_moptions;
int imo_multi_filter(const struct ip_moptions *, const struct ifnet *,
const struct sockaddr *, const struct sockaddr *);
void inm_commit(struct in_multi *);
void inm_clear_recorded(struct in_multi *);
void inm_print(const struct in_multi *);
int inm_record_source(struct in_multi *inm, const in_addr_t);
void inm_release(struct in_multi *);
void inm_release_locked(struct in_multi *);
struct in_multi *
in_addmulti(struct in_addr *, struct ifnet *);
void in_delmulti(struct in_multi *);
int in_joingroup(struct ifnet *, const struct in_addr *,
/*const*/ struct in_mfilter *, struct in_multi **);
int in_joingroup_locked(struct ifnet *, const struct in_addr *,
/*const*/ struct in_mfilter *, struct in_multi **);
int in_leavegroup(struct in_multi *, /*const*/ struct in_mfilter *);
int in_leavegroup_locked(struct in_multi *,
/*const*/ struct in_mfilter *);
int in_control(struct socket *, u_long, caddr_t, struct ifnet *,
struct thread *);
void in_rtqdrain(void);
void ip_input(struct mbuf *);
int in_ifadown(struct ifaddr *ifa, int);
void in_ifscrub(struct ifnet *, struct in_ifaddr *, u_int);
struct mbuf *ip_fastforward(struct mbuf *);
void *in_domifattach(struct ifnet *);
void in_domifdetach(struct ifnet *, void *);
/* XXX */
void in_rtalloc_ign(struct route *ro, u_long ignflags, u_int fibnum);
void in_rtalloc(struct route *ro, u_int fibnum);
struct rtentry *in_rtalloc1(struct sockaddr *, int, u_long, u_int);
void in_rtredirect(struct sockaddr *, struct sockaddr *,
struct sockaddr *, int, struct sockaddr *, u_int);
int in_rtrequest(int, struct sockaddr *,
struct sockaddr *, struct sockaddr *, int, struct rtentry **, u_int);
#if 0
int in_rt_getifa(struct rt_addrinfo *, u_int fibnum);
int in_rtioctl(u_long, caddr_t, u_int);
int in_rtrequest1(int, struct rt_addrinfo *, struct rtentry **, u_int);
#endif
#endif /* _KERNEL */
/* INET6 stuff */
#include <netinet6/in6_var.h>
#endif /* _NETINET_IN_VAR_H_ */