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NetBSD/sys/netinet6/in6_pcb.h
dyoung 72f0a6dfb0 Eliminate address family-specific route caches (struct route, struct 
route_in6, struct route_iso), replacing all caches with a struct
route.

The principle benefit of this change is that all of the protocol
families can benefit from route cache-invalidation, which is
necessary for correct routing.  Route-cache invalidation fixes an
ancient PR, kern/3508, at long last; it fixes various other PRs,
also.

Discussions with and ideas from Joerg Sonnenberger influenced this
work tremendously.  Of course, all design oversights and bugs are
mine.

DETAILS

1 I added to each address family a pool of sockaddrs.  I have
  introduced routines for allocating, copying, and duplicating,
  and freeing sockaddrs:

        struct sockaddr *sockaddr_alloc(sa_family_t af, int flags);
        struct sockaddr *sockaddr_copy(struct sockaddr *dst,
                                       const struct sockaddr *src);
        struct sockaddr *sockaddr_dup(const struct sockaddr *src, int flags);
        void sockaddr_free(struct sockaddr *sa);

  sockaddr_alloc() returns either a sockaddr from the pool belonging
  to the specified family, or NULL if the pool is exhausted.  The
  returned sockaddr has the right size for that family; sa_family
  and sa_len fields are initialized to the family and sockaddr
  length---e.g., sa_family = AF_INET and sa_len = sizeof(struct
  sockaddr_in).  sockaddr_free() puts the given sockaddr back into
  its family's pool.

  sockaddr_dup() and sockaddr_copy() work analogously to strdup()
  and strcpy(), respectively.  sockaddr_copy() KASSERTs that the
  family of the destination and source sockaddrs are alike.

  The 'flags' argumet for sockaddr_alloc() and sockaddr_dup() is
  passed directly to pool_get(9).

2 I added routines for initializing sockaddrs in each address
  family, sockaddr_in_init(), sockaddr_in6_init(), sockaddr_iso_init(),
  etc.  They are fairly self-explanatory.

3 structs route_in6 and route_iso are no more.  All protocol families
  use struct route.  I have changed the route cache, 'struct route',
  so that it does not contain storage space for a sockaddr.  Instead,
  struct route points to a sockaddr coming from the pool the sockaddr
  belongs to.  I added a new method to struct route, rtcache_setdst(),
  for setting the cache destination:

        int rtcache_setdst(struct route *, const struct sockaddr *);

  rtcache_setdst() returns 0 on success, or ENOMEM if no memory is
  available to create the sockaddr storage.

  It is now possible for rtcache_getdst() to return NULL if, say,
  rtcache_setdst() failed.  I check the return value for NULL
  everywhere in the kernel.

4 Each routing domain (struct domain) has a list of live route
  caches, dom_rtcache.  rtflushall(sa_family_t af) looks up the
  domain indicated by 'af', walks the domain's list of route caches
  and invalidates each one.
2007-05-02 20:40:22 +00:00

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/* $NetBSD: in6_pcb.h,v 1.32 2007/05/02 20:40:26 dyoung Exp $ */
/* $KAME: in6_pcb.h,v 1.45 2001/02/09 05:59:46 itojun Exp $ */
/*
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
* 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 project 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 PROJECT 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 PROJECT 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) 1982, 1986, 1990, 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_pcb.h 8.1 (Berkeley) 6/10/93
*/
#ifndef _NETINET6_IN6_PCB_H_
#define _NETINET6_IN6_PCB_H_
#include <sys/queue.h>
#include <netinet/in_pcb_hdr.h>
/*
* Common structure pcb for internet protocol implementation.
* Here are stored pointers to local and foreign host table
* entries, local and foreign socket numbers, and pointers
* up (to a socket structure) and down (to a protocol-specific)
* control block.
*/
struct icmp6_filter;
struct in6pcb {
struct inpcb_hdr in6p_head;
#define in6p_hash in6p_head.inph_hash
#define in6p_queue in6p_head.inph_queue
#define in6p_af in6p_head.inph_af
#define in6p_ppcb in6p_head.inph_ppcb
#define in6p_state in6p_head.inph_state
#define in6p_socket in6p_head.inph_socket
#define in6p_table in6p_head.inph_table
#define in6p_sp in6p_head.inph_sp
struct route in6p_route; /* placeholder for routing entry */
u_int16_t in6p_fport; /* foreign port */
u_int16_t in6p_lport; /* local port */
u_int32_t in6p_flowinfo; /* priority and flowlabel */
int in6p_flags; /* generic IP6/datagram flags */
int in6p_hops; /* default hop limit */
struct ip6_hdr in6p_ip6; /* header prototype */
struct mbuf *in6p_options; /* IP6 options */
struct ip6_pktopts *in6p_outputopts; /* IP6 options for outgoing packets */
struct ip6_moptions *in6p_moptions; /* IP6 multicast options */
struct icmp6_filter *in6p_icmp6filt;
int in6p_cksum; /* IPV6_CHECKSUM setsockopt */
};
#define in6p_faddr in6p_ip6.ip6_dst
#define in6p_laddr in6p_ip6.ip6_src
/* states in inp_state: */
#define IN6P_ATTACHED INP_ATTACHED
#define IN6P_BOUND INP_BOUND
#define IN6P_CONNECTED INP_CONNECTED
/*
* Flags in in6p_flags
* We define KAME's original flags in higher 16 bits as much as possible
* for compatibility with *bsd*s.
*/
#define IN6P_RECVOPTS 0x001000 /* receive incoming IP6 options */
#define IN6P_RECVRETOPTS 0x002000 /* receive IP6 options for reply */
#define IN6P_RECVDSTADDR 0x004000 /* receive IP6 dst address */
#define IN6P_IPV6_V6ONLY 0x008000 /* restrict AF_INET6 socket for v6 */
#define IN6P_PKTINFO 0x010000 /* receive IP6 dst and I/F */
#define IN6P_HOPLIMIT 0x020000 /* receive hoplimit */
#define IN6P_HOPOPTS 0x040000 /* receive hop-by-hop options */
#define IN6P_DSTOPTS 0x080000 /* receive dst options after rthdr */
#define IN6P_RTHDR 0x100000 /* receive routing header */
#define IN6P_RTHDRDSTOPTS 0x200000 /* receive dstoptions before rthdr */
#define IN6P_TCLASS 0x400000 /* traffic class */
#define IN6P_HIGHPORT 0x1000000 /* user wants "high" port binding */
#define IN6P_LOWPORT 0x2000000 /* user wants "low" port binding */
#define IN6P_ANONPORT 0x4000000 /* port chosen for user */
#define IN6P_FAITH 0x8000000 /* accept FAITH'ed connections */
#define IN6P_RFC2292 0x40000000 /* RFC2292 */
#define IN6P_MTU 0x80000000 /* use minimum MTU */
#define IN6P_CONTROLOPTS (IN6P_PKTINFO|IN6P_HOPLIMIT|IN6P_HOPOPTS|\
IN6P_DSTOPTS|IN6P_RTHDR|IN6P_RTHDRDSTOPTS|\
IN6P_TCLASS|IN6P_RFC2292|\
IN6P_MTU)
/* compute hash value for foreign and local in6_addr and port */
#define IN6_HASH(faddr, fport, laddr, lport) \
(((faddr)->s6_addr32[0] ^ (faddr)->s6_addr32[1] ^ \
(faddr)->s6_addr32[2] ^ (faddr)->s6_addr32[3] ^ \
(laddr)->s6_addr32[0] ^ (laddr)->s6_addr32[1] ^ \
(laddr)->s6_addr32[2] ^ (laddr)->s6_addr32[3]) \
+ (fport) + (lport))
#define sotoin6pcb(so) ((struct in6pcb *)(so)->so_pcb)
#ifdef _KERNEL
void in6_losing(struct in6pcb *);
void in6_pcbinit(struct inpcbtable *, int, int);
int in6_pcballoc(struct socket *, void *);
int in6_pcbbind(void *, struct mbuf *, struct lwp *);
int in6_pcbconnect(void *, struct mbuf *, struct lwp *);
void in6_pcbdetach(struct in6pcb *);
void in6_pcbdisconnect(struct in6pcb *);
struct in6pcb *in6_pcblookup_port(struct inpcbtable *, struct in6_addr *,
u_int, int);
int in6_pcbnotify(struct inpcbtable *, const struct sockaddr *,
u_int, const struct sockaddr *, u_int, int, void *,
void (*)(struct in6pcb *, int));
void in6_pcbpurgeif0(struct inpcbtable *, struct ifnet *);
void in6_pcbpurgeif(struct inpcbtable *, struct ifnet *);
void in6_pcbstate(struct in6pcb *, int);
void in6_rtchange(struct in6pcb *, int);
void in6_setpeeraddr(struct in6pcb *, struct mbuf *);
void in6_setsockaddr(struct in6pcb *, struct mbuf *);
/* in in6_src.c */
int in6_selecthlim(struct in6pcb *, struct ifnet *);
int in6_pcbsetport(struct in6_addr *, struct in6pcb *, struct lwp *);
extern struct rtentry *
in6_pcbrtentry(struct in6pcb *);
extern struct in6pcb *in6_pcblookup_connect(struct inpcbtable *,
const struct in6_addr *, u_int, const struct in6_addr *, u_int, int);
extern struct in6pcb *in6_pcblookup_bind(struct inpcbtable *,
const struct in6_addr *, u_int, int);
#endif /* _KERNEL */
#endif /* !_NETINET6_IN6_PCB_H_ */
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