593 lines
14 KiB
C
593 lines
14 KiB
C
/* $NetBSD: raw_ip.c,v 1.54 2001/01/24 09:04:15 itojun Exp $ */
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/*
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* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Copyright (c) 1982, 1986, 1988, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)raw_ip.c 8.7 (Berkeley) 5/15/95
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*/
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#include "opt_ipsec.h"
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#include "opt_mrouting.h"
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#include <sys/param.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/protosw.h>
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#include <sys/socketvar.h>
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#include <sys/errno.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <net/if.h>
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#include <net/route.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <netinet/ip_var.h>
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#include <netinet/ip_mroute.h>
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#include <netinet/ip_icmp.h>
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#include <netinet/in_pcb.h>
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#include <netinet/in_var.h>
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#include <machine/stdarg.h>
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#ifdef IPSEC
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#include <netinet6/ipsec.h>
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#endif /*IPSEC*/
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struct inpcbtable rawcbtable;
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int rip_bind __P((struct inpcb *, struct mbuf *));
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int rip_connect __P((struct inpcb *, struct mbuf *));
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void rip_disconnect __P((struct inpcb *));
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/*
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* Nominal space allocated to a raw ip socket.
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*/
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#define RIPSNDQ 8192
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#define RIPRCVQ 8192
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/*
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* Raw interface to IP protocol.
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*/
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/*
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* Initialize raw connection block q.
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*/
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void
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rip_init()
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{
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in_pcbinit(&rawcbtable, 1, 1);
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}
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static struct sockaddr_in ripsrc = { sizeof(ripsrc), AF_INET };
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/*
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* Setup generic address and protocol structures
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* for raw_input routine, then pass them along with
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* mbuf chain.
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*/
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void
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#if __STDC__
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rip_input(struct mbuf *m, ...)
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#else
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rip_input(m, va_alist)
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struct mbuf *m;
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va_dcl
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#endif
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{
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int off, proto;
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struct ip *ip = mtod(m, struct ip *);
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struct inpcb *inp;
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struct inpcb *last = 0;
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struct mbuf *opts = 0;
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struct sockaddr_in ripsrc;
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va_list ap;
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va_start(ap, m);
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off = va_arg(ap, int);
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proto = va_arg(ap, int);
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va_end(ap);
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ripsrc.sin_family = AF_INET;
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ripsrc.sin_len = sizeof(struct sockaddr_in);
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ripsrc.sin_addr = ip->ip_src;
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ripsrc.sin_port = 0;
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bzero((caddr_t)ripsrc.sin_zero, sizeof(ripsrc.sin_zero));
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/*
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* XXX Compatibility: programs using raw IP expect ip_len
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* XXX to have the header length subtracted.
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*/
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ip->ip_len -= ip->ip_hl << 2;
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for (inp = rawcbtable.inpt_queue.cqh_first;
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inp != (struct inpcb *)&rawcbtable.inpt_queue;
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inp = inp->inp_queue.cqe_next) {
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if (inp->inp_ip.ip_p && inp->inp_ip.ip_p != proto)
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continue;
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if (!in_nullhost(inp->inp_laddr) &&
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!in_hosteq(inp->inp_laddr, ip->ip_dst))
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continue;
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if (!in_nullhost(inp->inp_faddr) &&
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!in_hosteq(inp->inp_faddr, ip->ip_src))
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continue;
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if (last) {
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struct mbuf *n;
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if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
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if (last->inp_flags & INP_CONTROLOPTS ||
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last->inp_socket->so_options & SO_TIMESTAMP)
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ip_savecontrol(last, &opts, ip, n);
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if (sbappendaddr(&last->inp_socket->so_rcv,
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sintosa(&ripsrc), n, opts) == 0) {
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/* should notify about lost packet */
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m_freem(n);
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if (opts)
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m_freem(opts);
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} else
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sorwakeup(last->inp_socket);
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opts = NULL;
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}
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}
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last = inp;
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}
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if (last) {
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if (last->inp_flags & INP_CONTROLOPTS ||
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last->inp_socket->so_options & SO_TIMESTAMP)
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ip_savecontrol(last, &opts, ip, m);
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if (sbappendaddr(&last->inp_socket->so_rcv,
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sintosa(&ripsrc), m, opts) == 0) {
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m_freem(m);
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if (opts)
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m_freem(opts);
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} else
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sorwakeup(last->inp_socket);
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} else {
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if (inetsw[ip_protox[ip->ip_p]].pr_input == rip_input) {
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icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PROTOCOL,
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0, 0);
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ipstat.ips_noproto++;
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ipstat.ips_delivered--;
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} else
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m_freem(m);
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}
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return;
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}
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/*
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* Generate IP header and pass packet to ip_output.
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* Tack on options user may have setup with control call.
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*/
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int
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#if __STDC__
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rip_output(struct mbuf *m, ...)
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#else
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rip_output(m, va_alist)
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struct mbuf *m;
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va_dcl
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#endif
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{
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struct inpcb *inp;
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struct ip *ip;
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struct mbuf *opts;
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int flags;
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va_list ap;
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va_start(ap, m);
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inp = va_arg(ap, struct inpcb *);
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va_end(ap);
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flags =
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(inp->inp_socket->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST
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| IP_RETURNMTU;
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/*
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* If the user handed us a complete IP packet, use it.
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* Otherwise, allocate an mbuf for a header and fill it in.
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*/
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if ((inp->inp_flags & INP_HDRINCL) == 0) {
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if ((m->m_pkthdr.len + sizeof(struct ip)) > IP_MAXPACKET) {
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m_freem(m);
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return (EMSGSIZE);
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}
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M_PREPEND(m, sizeof(struct ip), M_WAIT);
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ip = mtod(m, struct ip *);
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ip->ip_tos = 0;
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ip->ip_off = 0;
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ip->ip_p = inp->inp_ip.ip_p;
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ip->ip_len = m->m_pkthdr.len;
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ip->ip_src = inp->inp_laddr;
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ip->ip_dst = inp->inp_faddr;
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ip->ip_ttl = MAXTTL;
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opts = inp->inp_options;
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} else {
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if (m->m_pkthdr.len > IP_MAXPACKET) {
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m_freem(m);
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return (EMSGSIZE);
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}
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ip = mtod(m, struct ip *);
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if (m->m_pkthdr.len != ip->ip_len) {
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m_freem(m);
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return (EINVAL);
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}
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if (ip->ip_id == 0)
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ip->ip_id = htons(ip_id++);
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opts = NULL;
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/* XXX prevent ip_output from overwriting header fields */
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flags |= IP_RAWOUTPUT;
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ipstat.ips_rawout++;
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}
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#ifdef IPSEC
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if (ipsec_setsocket(m, inp->inp_socket) != 0) {
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m_freem(m);
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return ENOBUFS;
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}
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#endif /*IPSEC*/
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return (ip_output(m, opts, &inp->inp_route, flags, inp->inp_moptions, &inp->inp_errormtu));
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}
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/*
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* Raw IP socket option processing.
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*/
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int
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rip_ctloutput(op, so, level, optname, m)
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int op;
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struct socket *so;
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int level, optname;
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struct mbuf **m;
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{
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struct inpcb *inp = sotoinpcb(so);
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int error = 0;
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if (level != IPPROTO_IP) {
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error = ENOPROTOOPT;
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if (op == PRCO_SETOPT && *m != 0)
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(void) m_free(*m);
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} else switch (op) {
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case PRCO_SETOPT:
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switch (optname) {
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case IP_HDRINCL:
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if (*m == 0 || (*m)->m_len < sizeof (int))
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error = EINVAL;
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else {
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if (*mtod(*m, int *))
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inp->inp_flags |= INP_HDRINCL;
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else
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inp->inp_flags &= ~INP_HDRINCL;
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}
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if (*m != 0)
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(void) m_free(*m);
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break;
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#ifdef MROUTING
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case MRT_INIT:
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case MRT_DONE:
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case MRT_ADD_VIF:
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case MRT_DEL_VIF:
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case MRT_ADD_MFC:
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case MRT_DEL_MFC:
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case MRT_ASSERT:
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error = ip_mrouter_set(so, optname, m);
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break;
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#endif
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default:
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error = ip_ctloutput(op, so, level, optname, m);
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break;
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}
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break;
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case PRCO_GETOPT:
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switch (optname) {
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case IP_HDRINCL:
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*m = m_get(M_WAIT, M_SOOPTS);
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(*m)->m_len = sizeof (int);
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*mtod(*m, int *) = inp->inp_flags & INP_HDRINCL ? 1 : 0;
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break;
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#ifdef MROUTING
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case MRT_VERSION:
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case MRT_ASSERT:
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error = ip_mrouter_get(so, optname, m);
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break;
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#endif
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default:
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error = ip_ctloutput(op, so, level, optname, m);
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break;
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}
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break;
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}
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return (error);
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}
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int
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rip_bind(inp, nam)
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struct inpcb *inp;
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struct mbuf *nam;
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{
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struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *);
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if (nam->m_len != sizeof(*addr))
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return (EINVAL);
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if (ifnet.tqh_first == 0)
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return (EADDRNOTAVAIL);
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if (addr->sin_family != AF_INET &&
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addr->sin_family != AF_IMPLINK)
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return (EAFNOSUPPORT);
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if (!in_nullhost(addr->sin_addr) &&
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ifa_ifwithaddr(sintosa(addr)) == 0)
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return (EADDRNOTAVAIL);
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inp->inp_laddr = addr->sin_addr;
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return (0);
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}
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int
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rip_connect(inp, nam)
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struct inpcb *inp;
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struct mbuf *nam;
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{
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struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *);
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if (nam->m_len != sizeof(*addr))
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return (EINVAL);
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if (ifnet.tqh_first == 0)
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return (EADDRNOTAVAIL);
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if (addr->sin_family != AF_INET &&
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addr->sin_family != AF_IMPLINK)
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return (EAFNOSUPPORT);
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inp->inp_faddr = addr->sin_addr;
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return (0);
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}
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void
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rip_disconnect(inp)
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struct inpcb *inp;
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{
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inp->inp_faddr = zeroin_addr;
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}
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u_long rip_sendspace = RIPSNDQ;
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u_long rip_recvspace = RIPRCVQ;
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/*ARGSUSED*/
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int
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rip_usrreq(so, req, m, nam, control, p)
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struct socket *so;
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int req;
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struct mbuf *m, *nam, *control;
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struct proc *p;
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{
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struct inpcb *inp;
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int s;
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int error = 0;
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#ifdef MROUTING
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extern struct socket *ip_mrouter;
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#endif
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if (req == PRU_CONTROL)
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return (in_control(so, (long)m, (caddr_t)nam,
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(struct ifnet *)control, p));
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if (req == PRU_PURGEIF) {
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in_purgeif((struct ifnet *)control);
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in_pcbpurgeif(&rawcbtable, (struct ifnet *)control);
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return (0);
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}
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s = splsoftnet();
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inp = sotoinpcb(so);
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#ifdef DIAGNOSTIC
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if (req != PRU_SEND && req != PRU_SENDOOB && control)
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panic("rip_usrreq: unexpected control mbuf");
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#endif
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if (inp == 0 && req != PRU_ATTACH) {
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error = EINVAL;
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goto release;
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}
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switch (req) {
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case PRU_ATTACH:
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if (inp != 0) {
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error = EISCONN;
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break;
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}
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if (p == 0 || (error = suser(p->p_ucred, &p->p_acflag))) {
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error = EACCES;
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break;
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}
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if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
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error = soreserve(so, rip_sendspace, rip_recvspace);
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if (error)
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break;
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}
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error = in_pcballoc(so, &rawcbtable);
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if (error)
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break;
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inp = sotoinpcb(so);
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inp->inp_ip.ip_p = (long)nam;
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#ifdef IPSEC
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error = ipsec_init_policy(so, &inp->inp_sp);
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if (error != 0) {
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in_pcbdetach(inp);
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break;
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}
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#endif /*IPSEC*/
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break;
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case PRU_DETACH:
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#ifdef MROUTING
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if (so == ip_mrouter)
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ip_mrouter_done();
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#endif
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in_pcbdetach(inp);
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break;
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case PRU_BIND:
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error = rip_bind(inp, nam);
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break;
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case PRU_LISTEN:
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error = EOPNOTSUPP;
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break;
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case PRU_CONNECT:
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error = rip_connect(inp, nam);
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if (error)
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break;
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soisconnected(so);
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break;
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case PRU_CONNECT2:
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error = EOPNOTSUPP;
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break;
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case PRU_DISCONNECT:
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soisdisconnected(so);
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rip_disconnect(inp);
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break;
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/*
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* Mark the connection as being incapable of further input.
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*/
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case PRU_SHUTDOWN:
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socantsendmore(so);
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break;
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case PRU_RCVD:
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error = EOPNOTSUPP;
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break;
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/*
|
|
* Ship a packet out. The appropriate raw output
|
|
* routine handles any massaging necessary.
|
|
*/
|
|
case PRU_SEND:
|
|
if (control && control->m_len) {
|
|
m_freem(control);
|
|
m_freem(m);
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
{
|
|
if (nam) {
|
|
if ((so->so_state & SS_ISCONNECTED) != 0) {
|
|
error = EISCONN;
|
|
goto die;
|
|
}
|
|
error = rip_connect(inp, nam);
|
|
if (error) {
|
|
die:
|
|
m_freem(m);
|
|
break;
|
|
}
|
|
} else {
|
|
if ((so->so_state & SS_ISCONNECTED) == 0) {
|
|
error = ENOTCONN;
|
|
goto die;
|
|
}
|
|
}
|
|
error = rip_output(m, inp);
|
|
if (nam)
|
|
rip_disconnect(inp);
|
|
}
|
|
break;
|
|
|
|
case PRU_SENSE:
|
|
/*
|
|
* stat: don't bother with a blocksize.
|
|
*/
|
|
splx(s);
|
|
return (0);
|
|
|
|
case PRU_RCVOOB:
|
|
error = EOPNOTSUPP;
|
|
break;
|
|
|
|
case PRU_SENDOOB:
|
|
m_freem(control);
|
|
m_freem(m);
|
|
error = EOPNOTSUPP;
|
|
break;
|
|
|
|
case PRU_SOCKADDR:
|
|
in_setsockaddr(inp, nam);
|
|
break;
|
|
|
|
case PRU_PEERADDR:
|
|
in_setpeeraddr(inp, nam);
|
|
break;
|
|
|
|
default:
|
|
panic("rip_usrreq");
|
|
}
|
|
|
|
release:
|
|
splx(s);
|
|
return (error);
|
|
}
|