raw_ip.c

来自「eCos操作系统源码」· C语言 代码 · 共 695 行 · 第 1/2 页

//==========================================================================
//
//      src/sys/netinet/raw_ip.c
//
//==========================================================================
//####BSDCOPYRIGHTBEGIN####
//
// -------------------------------------------
//
// Portions of this software may have been derived from OpenBSD, 
// FreeBSD or other sources, and are covered by the appropriate
// copyright disclaimers included herein.
//
// Portions created by Red Hat are
// Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
//
// -------------------------------------------
//
//####BSDCOPYRIGHTEND####
//==========================================================================

/*
 * Copyright (c) 1982, 1986, 1988, 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 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.
 *
 *	@(#)raw_ip.c	8.7 (Berkeley) 5/15/95
 * $FreeBSD: src/sys/netinet/raw_ip.c,v 1.64.2.8 2001/07/29 19:32:40 ume Exp $
 */

#include <sys/param.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sysctl.h>

#include <net/if.h>
#include <net/route.h>

#define _IP_VHL
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/in_pcb.h>
#include <netinet/in_var.h>
#include <netinet/ip_var.h>
#include <netinet/ip_mroute.h>

#include <netinet/ip_fw.h>

#ifdef IPSEC
#include <netinet6/ipsec.h>
#endif /*IPSEC*/

#ifdef DUMMYNET
#include <netinet/ip_dummynet.h>
#endif

struct	inpcbhead ripcb;
struct	inpcbinfo ripcbinfo;

/*
 * Nominal space allocated to a raw ip socket.
 */
#define	RIPSNDQ		8192
#define	RIPRCVQ		8192

/*
 * Raw interface to IP protocol.
 */

/*
 * Initialize raw connection block q.
 */
void
rip_init()
{
	LIST_INIT(&ripcb);
	ripcbinfo.listhead = &ripcb;
	/*
	 * XXX We don't use the hash list for raw IP, but it's easier
	 * to allocate a one entry hash list than it is to check all
	 * over the place for hashbase == NULL.
	 */
	ripcbinfo.hashbase = hashinit(1, M_PCB, &ripcbinfo.hashmask);
	ripcbinfo.porthashbase = hashinit(1, M_PCB, &ripcbinfo.porthashmask);
	ripcbinfo.ipi_zone = zinit("ripcb", sizeof(struct inpcb),
				   maxsockets, ZONE_INTERRUPT, 0);
}

static struct	sockaddr_in ripsrc = { sizeof(ripsrc), AF_INET };
/*
 * Setup generic address and protocol structures
 * for raw_input routine, then pass them along with
 * mbuf chain.
 */
void
rip_input(m, off)
	struct mbuf *m;
	int off;
{
	register struct ip *ip = mtod(m, struct ip *);
	register struct inpcb *inp;
	struct inpcb *last = 0;
	struct mbuf *opts = 0;
	int proto = ip->ip_p;

	ripsrc.sin_addr = ip->ip_src;
	LIST_FOREACH(inp, &ripcb, inp_list) {
#ifdef INET6
		if ((inp->inp_vflag & INP_IPV4) == 0)
			continue;
#endif
		if (inp->inp_ip_p && inp->inp_ip_p != proto)
			continue;
		if (inp->inp_laddr.s_addr &&
                  inp->inp_laddr.s_addr != ip->ip_dst.s_addr)
			continue;
		if (inp->inp_faddr.s_addr &&
                  inp->inp_faddr.s_addr != ip->ip_src.s_addr)
			continue;
		if (last) {
			struct mbuf *n = m_copy(m, 0, (int)M_COPYALL);

#ifdef IPSEC
			/* check AH/ESP integrity. */
			if (n && ipsec4_in_reject_so(n, last->inp_socket)) {
				m_freem(n);
				ipsecstat.in_polvio++;
				/* do not inject data to pcb */
			} else
#endif /*IPSEC*/
			if (n) {
				if (last->inp_flags & INP_CONTROLOPTS ||
				    last->inp_socket->so_options & SO_TIMESTAMP)
				    ip_savecontrol(last, &opts, ip, n);
				if (sbappendaddr(&last->inp_socket->so_rcv,
				    (struct sockaddr *)&ripsrc, n,
				    opts) == 0) {
					/* should notify about lost packet */
					m_freem(n);
					if (opts)
					    m_freem(opts);
				} else
					sorwakeup(last->inp_socket);
				opts = 0;
			}
		}
		last = inp;
	}
#ifdef IPSEC
	/* check AH/ESP integrity. */
	if (last && ipsec4_in_reject_so(m, last->inp_socket)) {
		m_freem(m);
		ipsecstat.in_polvio++;
		ipstat.ips_delivered--;
		/* do not inject data to pcb */
	} else
#endif /*IPSEC*/
	if (last) {
		if (last->inp_flags & INP_CONTROLOPTS ||
		    last->inp_socket->so_options & SO_TIMESTAMP)
			ip_savecontrol(last, &opts, ip, m);
		if (sbappendaddr(&last->inp_socket->so_rcv,
		    (struct sockaddr *)&ripsrc, m, opts) == 0) {
			m_freem(m);
			if (opts)
			    m_freem(opts);
		} else
			sorwakeup(last->inp_socket);
	} else {
		m_freem(m);
		ipstat.ips_noproto++;
		ipstat.ips_delivered--;
	}
}

/*
 * Generate IP header and pass packet to ip_output.
 * Tack on options user may have setup with control call.
 */
int
rip_output(m, so, dst)
	struct mbuf *m;
	struct socket *so;
	u_long dst;
{
	register struct ip *ip;
	register struct inpcb *inp = sotoinpcb(so);
	int flags = (so->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST;

	/*
	 * If the user handed us a complete IP packet, use it.
	 * Otherwise, allocate an mbuf for a header and fill it in.
	 */
	if ((inp->inp_flags & INP_HDRINCL) == 0) {
		if (m->m_pkthdr.len + sizeof(struct ip) > IP_MAXPACKET) {
			m_freem(m);
			return(EMSGSIZE);
		}
		M_PREPEND(m, sizeof(struct ip), M_WAIT);
		ip = mtod(m, struct ip *);
		ip->ip_tos = inp->inp_ip_tos;
		ip->ip_off = 0;
		ip->ip_p = inp->inp_ip_p;
		ip->ip_len = m->m_pkthdr.len;
		ip->ip_src = inp->inp_laddr;
		ip->ip_dst.s_addr = dst;
		ip->ip_ttl = inp->inp_ip_ttl;
	} else {
		if (m->m_pkthdr.len > IP_MAXPACKET) {
			m_freem(m);
			return(EMSGSIZE);
		}
		ip = mtod(m, struct ip *);
		/* don't allow both user specified and setsockopt options,
		   and don't allow packet length sizes that will crash */
		if (((IP_VHL_HL(ip->ip_vhl) != (sizeof (*ip) >> 2))
		     && inp->inp_options)
		    || (ip->ip_len > m->m_pkthdr.len)
		    || (ip->ip_len < (IP_VHL_HL(ip->ip_vhl) << 2))) {
			m_freem(m);
			return EINVAL;
		}
		if (ip->ip_id == 0)
#ifdef RANDOM_IP_ID
			ip->ip_id = ip_randomid();
#else
			ip->ip_id = htons(ip_id++);
#endif
		/* XXX prevent ip_output from overwriting header fields */
		flags |= IP_RAWOUTPUT;
		ipstat.ips_rawout++;
	}

#ifdef IPSEC
	if (ipsec_setsocket(m, so) != 0) {
		m_freem(m);
		return ENOBUFS;
	}
#endif /*IPSEC*/

	return (ip_output(m, inp->inp_options, &inp->inp_route, flags,
			  inp->inp_moptions));
}

/*
 * Raw IP socket option processing.
 */
int
rip_ctloutput(so, sopt)
	struct socket *so;
	struct sockopt *sopt;
{
	struct	inpcb *inp = sotoinpcb(so);
	int	error, optval;

	if (sopt->sopt_level != IPPROTO_IP)
		return (EINVAL);

	error = 0;

	switch (sopt->sopt_dir) {
	case SOPT_GET:
		switch (sopt->sopt_name) {
		case IP_HDRINCL:
			optval = inp->inp_flags & INP_HDRINCL;
			error = sooptcopyout(sopt, &optval, sizeof optval);
			break;

		case IP_FW_ADD:
		case IP_FW_GET:
			if (ip_fw_ctl_ptr == 0)
				error = ENOPROTOOPT;
			else
				error = ip_fw_ctl_ptr(sopt);
			break;

#ifdef DUMMYNET
		case IP_DUMMYNET_GET:
			if (ip_dn_ctl_ptr == NULL)
				error = ENOPROTOOPT ;
			else
				error = ip_dn_ctl_ptr(sopt);
			break ;
#endif /* DUMMYNET */

		case MRT_INIT:
		case MRT_DONE:
		case MRT_ADD_VIF:
		case MRT_DEL_VIF:
		case MRT_ADD_MFC:
		case MRT_DEL_MFC:
		case MRT_VERSION:
		case MRT_ASSERT:
			error = ip_mrouter_get(so, sopt);
			break;

		default:
			error = ip_ctloutput(so, sopt);
			break;
		}
		break;

	case SOPT_SET:
		switch (sopt->sopt_name) {
		case IP_HDRINCL:
			error = sooptcopyin(sopt, &optval, sizeof optval,
					    sizeof optval);
			if (error)
				break;
			if (optval)
				inp->inp_flags |= INP_HDRINCL;
			else
				inp->inp_flags &= ~INP_HDRINCL;
			break;

		case IP_FW_ADD:
		case IP_FW_DEL: