sys/netinet6/ip6protosw.h
author dyoung <dyoung@NetBSD.org>
Thu, 19 Jul 2007 20:48:52 +0000
branchtrunk
changeset 160532 102e2ce77664
parent 156252 0db6ad9d0674
child 169089 2d15cef7502c
child 284151 98d8737de550
child 284516 80f6d26fb7b3
permissions -rw-r--r--
Take steps to hide the radix_node implementation of the forwarding table from the forwarding table's users: Introduce rt_walktree() for walking the routing table and applying a function to each rtentry. Replace most rn_walktree() calls with it. Use rt_getkey()/rt_setkey() to get/set a route's destination. Keep a pointer to the sockaddr key in the rtentry, so that rtentry users do not have to grovel in the radix_node for the key. Add a RTM_GET method to rtrequest. Use that instead of radix_node lookups in, e.g., carp(4). Add sys/net/link_proto.c, which supplies sockaddr routines for link-layer socket addresses (sockaddr_dl). Cosmetic: Constify. KNF. Stop open-coding LIST_FOREACH, TAILQ_FOREACH, et cetera. Use NULL instead of 0 for null pointers. Use __arraycount(). Reduce gratuitous parenthesization. Stop using variadic arguments for rip6_output(), it is unnecessary. Remove the unnecessary rtentry member rt_genmask and the code to maintain it, since nothing actually used it. Make rt_maskedcopy() easier to read by using meaningful variable names. Extract a subroutine intern_netmask() for looking up a netmask in the masks table. Start converting backslash-ridden IPv6 macros in sys/netinet6/in6_var.h into inline subroutines that one can read without special eyeglasses. One functional change: when the kernel serves an RTM_GET, RTM_LOCK, or RTM_CHANGE request, it applies the netmask (if supplied) to a destination before searching for it in the forwarding table. I have changed sys/netinet/ip_carp.c, carp_setroute(), to remove the unlawful radix_node knowledge. Apart from the changes to carp(4), netiso, ATM, and strip(4), I have run the changes on three nodes in my wireless routing testbed, which involves IPv4 + IPv6 dynamic routing acrobatics, and it's working beautifully so far.

/*	$NetBSD: ip6protosw.h,v 1.19 2007/07/19 20:48:57 dyoung Exp $	*/
/*	$KAME: ip6protosw.h,v 1.22 2001/02/08 18:02:08 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.
 *
 */

/*	BSDI protosw.h,v 2.3 1996/10/11 16:02:40 pjd 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.
 *
 *	@(#)protosw.h	8.1 (Berkeley) 6/2/93
 */

#ifndef _NETINET6_IP6PROTOSW_H_
#define _NETINET6_IP6PROTOSW_H_

/*
 * Protocol switch table for IPv6.
 * All other definitions should refer to sys/protosw.h
 */

struct mbuf;
struct sockaddr;
struct socket;
struct domain;
struct proc;
struct ip6_hdr;
struct icmp6_hdr;
struct in6_addr;

/*
 * argument type for the last arg of pr_ctlinput().
 * should be consulted only with AF_INET6 family.
 *
 * IPv6 ICMP IPv6 [exthdrs] finalhdr paylaod
 * ^    ^    ^              ^
 * |    |    ip6c_ip6       ip6c_off
 * |    ip6c_icmp6
 * ip6c_m
 *
 * ip6c_finaldst usually points to ip6c_ip6->ip6_dst.  if the original
 * (internal) packet carries a routing header, it may point the final
 * dstination address in the routing header.
 *
 * ip6c_src: ip6c_ip6->ip6_src + scope info + flowlabel in ip6c_ip6
 *	(beware of flowlabel, if you try to compare it against others)
 * ip6c_dst: ip6c_finaldst + scope info
 */
struct ip6ctlparam {
	struct mbuf *ip6c_m;		/* start of mbuf chain */
	struct icmp6_hdr *ip6c_icmp6;	/* icmp6 header of target packet */
	struct ip6_hdr *ip6c_ip6;	/* ip6 header of target packet */
	int ip6c_off;			/* offset of the target proto header */
	struct sockaddr_in6 *ip6c_src;	/* srcaddr w/ additional info */
	struct sockaddr_in6 *ip6c_dst;	/* (final) dstaddr w/ additional info */
	struct in6_addr *ip6c_finaldst;	/* final destination address */
	void *ip6c_cmdarg;		/* control command dependent data */
	u_int8_t ip6c_nxt;		/* final next header field */
};

struct ip6protosw {
	int 	pr_type;		/* socket type used for */
	struct	domain *pr_domain;	/* domain protocol a member of */
	short	pr_protocol;		/* protocol number */
	short	pr_flags;		/* see below */

/* protocol-protocol hooks */
	int	(*pr_input)		/* input to protocol (from below) */
			(struct mbuf **, int *, int);
	int	(*pr_output)		/* output to protocol (from above) */
			(struct mbuf *, struct socket *, struct sockaddr_in6 *,
			 struct mbuf *);
	void	(*pr_ctlinput)		/* control input (from below) */
			(int, const struct sockaddr *, void *);
	int	(*pr_ctloutput)		/* control output (from above) */
			(int, struct socket *, int, int, struct mbuf **);

/* user-protocol hook */
	int	(*pr_usrreq)		/* user request: see list below */
			(struct socket *, int, struct mbuf *,
			     struct mbuf *, struct mbuf *, struct lwp *);

/* utility hooks */
	void	(*pr_init)		/* initialization hook */
			(void);

	void	(*pr_fasttimo)		/* fast timeout (200ms) */
			(void);
	void	(*pr_slowtimo)		/* slow timeout (500ms) */
			(void);
	void	(*pr_drain)		/* flush any excess space possible */
			(void);
};

extern const struct ip6protosw inet6sw[];

#endif /* !_NETINET6_IP6PROTOSW_H_ */