raw_ip.c

VxWorks网络部分的源代码

/* rawip.c - raw interface to IP protocol */

/* Copyright 1984-1996 Wind River Systems, Inc. */
#include "copyright_wrs.h"

/*
 * Copyright (c) 1982, 1986, 1988, 1993, 1995
 *	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
 */

/*
modification history
--------------------
01g,26aug98,n_s  corrected rip_output for IP_HDRINCL case. spr #22246
01f,26aug98,n_s  added return val check for M_PREPEND in rip_output and
                 mBufClGet in rip_ctloutput. spr # 22238.
01e,16apr97,vin	 added PRU_CONTROL support to rip_usrreq().
01d,08apr97,vin  include pcb hashing changes from FREEBSD2.2.1, removed
		 ip_mrouter, added mCastRouteCmdHook. removed all MROUTING
01c,31jan97,vin  changed declaration according to prototype decl in protosw.h
01b,22nov96,vin  added cluster support replaced m_get(..) with mBufClGet(..).
01a,03mar96,vin  created from BSD4.4 stuff,integrated with 02i of raw_usrreq.c
*/

/*
DESCRIPTION
*/

#include "vxWorks.h"
#include "net/mbuf.h"
#include "sys/socket.h"
#include "net/protosw.h"
#include "net/socketvar.h"
#include "errno.h"

#include "net/if.h"
#include "net/route.h"
#include "net/raw_cb.h"

#include "netinet/in.h"
#include "netinet/in_systm.h"
#include "netinet/ip.h"
#include "netinet/ip_var.h"
#include "netinet/ip_mroute.h"
#include "netinet/in_pcb.h"

/* externs */
extern FUNCPTR _mCastRouteCmdHook;	/* WRS mcast route command hook */

/* globals */

static struct inpcbhead ripcb;
static struct inpcbinfo ripcbinfo;
static struct sockaddr_in ripsrc = { sizeof(ripsrc), AF_INET };

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

/* locals */
static int _mCastCtlOutput (int option, int optName, struct socket * sockPtr,
                            struct mbuf ** pPtrMbuf); 
/*
 * 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, MT_PCB, &ripcbinfo.hashmask);
}

/*
 * Setup generic address and protocol structures
 * for raw_input routine, then pass them along with
 * mbuf chain.
 */
void
rip_input(m)
	struct mbuf *m;
{
	register struct ip *ip = mtod(m, struct ip *);
	register struct inpcb *inp;
	struct socket *last = 0;

	ripsrc.sin_addr = ip->ip_src;
        for (inp = ripcb.lh_first; inp != NULL; inp = inp->inp_list.le_next) {
		if (inp->inp_ip.ip_p && inp->inp_ip.ip_p != ip->ip_p)
			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;
			if (n = m_copy(m, 0, (int)M_COPYALL)) {
				if (sbappendaddr(&last->so_rcv,
				    (struct sockaddr *)&ripsrc, n,
				    (struct mbuf *)0) == 0)
					/* should notify about lost packet */
					m_freem(n);
				else
					sorwakeup(last);
			}
		}
		last = inp->inp_socket;
	}
	if (last) {
		if (sbappendaddr(&last->so_rcv, (struct sockaddr *)&ripsrc,
		    m, (struct mbuf *)0) == 0)
			m_freem(m);
		else
			sorwakeup(last);
	} else {
		m_freem(m);
		ipstat.ips_noproto++;
		ipstat.ips_delivered--;
	}
	return;
}

/*
 * 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)
	register struct mbuf *m;
	struct socket *so;
	u_long dst;
{
	register struct ip *ip;
	register struct inpcb *inp = sotoinpcb(so);
	struct mbuf *opts;
	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) {
		M_PREPEND(m, sizeof(struct ip), M_WAIT);
		if (m == (struct mbuf *) NULL)
		    {
		    return (ENOBUFS);
		    }
		    
		ip = mtod(m, struct ip *);
		ip->ip_tos = 0;
		ip->ip_off = 0;
		ip->ip_p = inp->inp_ip.ip_p;
		ip->ip_len = m->m_pkthdr.len;
		ip->ip_src = inp->inp_laddr;
		ip->ip_dst.s_addr = dst;

	/* Default set to IPDEFTTL but can be Modified by SNMP through MIB-II */
		ip->ip_ttl = ipTimeToLive;

		opts = inp->inp_options;
	} else {
	        if (m->m_len < sizeof (struct ip) &&
		    (m = m_pullup (m, sizeof (struct ip))) == NULL)
		    {
		    return (ENOBUFS);
		    }

		ip = mtod(m, struct ip *);
		if (ip->ip_id == 0)
			ip->ip_id = htons(ip_id++);
		opts = NULL;
		/* XXX prevent ip_output from overwriting header fields */
		flags |= IP_RAWOUTPUT;
		ipstat.ips_rawout++;
	}
	return (ip_output(m, opts, &inp->inp_route, flags, inp->inp_moptions));
}

/*
 * Raw IP socket option processing.
 */
int
rip_ctloutput(op, so, level, optname, m)
	int op;
	struct socket *so;
	int level, optname;
	struct mbuf **m;
{
	register struct inpcb *inp = sotoinpcb(so);
	register int error;

	if (level != IPPROTO_IP) {
		if (op == PRCO_SETOPT && *m)
			(void) m_free(*m);
		return (EINVAL);
	}

	switch (optname) {

	case IP_HDRINCL:
		error = 0;
		if (op == PRCO_SETOPT) {
			if (*m == 0 || (*m)->m_len < sizeof (int))
				error = EINVAL;
			else if (*mtod(*m, int *))
				inp->inp_flags |= INP_HDRINCL;
			else
				inp->inp_flags &= ~INP_HDRINCL;
			if (*m)
				(void)m_free(*m);
		} else {
			*m = mBufClGet(M_WAIT, MT_SOOPTS, CL_SIZE_128, TRUE);
			if (*m == (struct mbuf *) NULL)
			    {
			    error = ENOBUFS;
			    }
			else
			    {
			    (*m)->m_len = sizeof (int);
			    *mtod(*m, int *) = inp->inp_flags & INP_HDRINCL;
			    }
		}
		return (error);

	case DVMRP_INIT:
	case DVMRP_DONE:
	case DVMRP_ADD_VIF:
	case DVMRP_DEL_VIF:
	case DVMRP_ADD_LGRP:
	case DVMRP_DEL_LGRP:
	case DVMRP_ADD_MRT:
	case DVMRP_DEL_MRT:

            	return (_mCastCtlOutput (op, optname, so, m));

	default:
		if (optname >= DVMRP_INIT)
            		return (_mCastCtlOutput (op, optname, so, m));
	}
	return (ip_ctloutput(op, so, level, optname, m));
}

u_long	rip_sendspace = RIPSNDQ;
u_long	rip_recvspace = RIPRCVQ;

/*ARGSUSED*/
int
rip_usrreq(so, req, m, nam, control)
	register struct socket *so;
	int req;
	struct mbuf *m, *nam, *control;
{
	register int error = 0;
	register struct inpcb *inp = sotoinpcb(so);

        if (req == PRU_CONTROL)
            return (in_control(so, (u_long)m, (caddr_t)nam,
                    (struct ifnet *)control));

	switch (req) {

	case PRU_ATTACH:
		if (inp)
			panic("rip_attach");
		if ((so->so_state & SS_PRIV) == 0) {
			error = EACCES;
			break;
		}
		if ((error = soreserve(so, rip_sendspace, rip_recvspace)) ||
		    (error = in_pcballoc(so, &ripcbinfo)))
			break;
		inp = (struct inpcb *)so->so_pcb;
		inp->inp_ip.ip_p = (int)nam;
		break;

	case PRU_DISCONNECT:
		if ((so->so_state & SS_ISCONNECTED) == 0) {
			error = ENOTCONN;
			break;
		}
		/* FALLTHROUGH */
	case PRU_ABORT:
		soisdisconnected(so);
		/* FALLTHROUGH */
	case PRU_DETACH:
		if (inp == 0)
			panic("rip_detach");

		in_pcbdetach(inp);
		break;

	case PRU_BIND:
	    {
		struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *);

		if (nam->m_len != sizeof(*addr)) {
			error = EINVAL;
			break;
		}
		if ((ifnet == 0) ||
		    ((addr->sin_family != AF_INET) &&
		     (addr->sin_family != AF_IMPLINK)) ||
		    (addr->sin_addr.s_addr &&
		     ifa_ifwithaddr((struct sockaddr *)addr) == 0)) {
			error = EADDRNOTAVAIL;
			break;
		}
		inp->inp_laddr = addr->sin_addr;
		break;
	    }
	case PRU_CONNECT:
	    {
		struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *);

		if (nam->m_len != sizeof(*addr)) {
			error = EINVAL;
			break;
		}
		if (ifnet == 0) {
			error = EADDRNOTAVAIL;
			break;
		}
		if ((addr->sin_family != AF_INET) &&
		     (addr->sin_family != AF_IMPLINK)) {
			error = EAFNOSUPPORT;
			break;
		}
		inp->inp_faddr = addr->sin_addr;
		soisconnected(so);
		break;
	    }

	case PRU_CONNECT2:
		error = EOPNOTSUPP;
		break;

	/*
	 * Mark the connection as being incapable of further input.
	 */
	case PRU_SHUTDOWN:
		socantsendmore(so);
		break;

	/*
	 * Ship a packet out.  The appropriate raw output
	 * routine handles any massaging necessary.
	 */
	case PRU_SEND:
	    {
		register u_long dst;

		if (so->so_state & SS_ISCONNECTED) {
			if (nam) {
				error = EISCONN;
				break;
			}
			dst = inp->inp_faddr.s_addr;
		} else {
			if (nam == NULL) {
				error = ENOTCONN;
				break;
			}
			dst = mtod(nam, struct sockaddr_in *)->sin_addr.s_addr;
		}
		error = rip_output(m, so, dst);
		m = NULL;
		break;
	    }

	case PRU_SENSE:
		/*
		 * stat: don't bother with a blocksize.
		 */
		return (0);

	/*
	 * Not supported.
	 */
	case PRU_RCVOOB:
	case PRU_RCVD:
	case PRU_LISTEN:
	case PRU_ACCEPT:
	case PRU_SENDOOB:
		error = EOPNOTSUPP;
		break;

	case PRU_SOCKADDR:
		in_setsockaddr(inp, nam);
		break;

	case PRU_PEERADDR:
		in_setpeeraddr(inp, nam);
		break;

	default:
		panic("rip_usrreq");
	}
	if (m != NULL)
		m_freem(m);
	return (error);
}

/*******************************************************************************
* mCastCtlOutput - send commands to multicast routing engine.
*
* This function sends commands to multicast routing engine.
*
* INTERNAL
* This function can be further expanded to receive multicast options also.
* That is the reason for passing a pointer to a pointer to an mbuf as one of
* the argument.
*
* RETURNS: OK/ERROR
*
* NOMANUAL
*/

static int _mCastCtlOutput
    (
    int 		option,		/* type of option */
    int 		optName,	/* name of the option */
    struct socket * 	sockPtr,	/* pointer to the socket */
    struct mbuf **	pPtrMbuf	/* pointer to pointer to an mbuf */
    )
    {
    register int error = EINVAL;	/* default error value */

    if (pPtrMbuf == NULL)
        return (error);
    
    if (option == PRCO_SETOPT)
        {
        if (_mCastRouteCmdHook != NULL)
            error = (*_mCastRouteCmdHook)(optName, sockPtr, *pPtrMbuf);
        else
            error = EOPNOTSUPP; 
        }

    if (*pPtrMbuf != NULL)
        (void) m_free (*pPtrMbuf);

    return (error);
    }