661 lines
15 KiB
C
661 lines
15 KiB
C
/*
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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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* $FreeBSD$
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*/
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#include "opt_inet6.h"
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#include "opt_ipsec.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/protosw.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/sysctl.h>
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#include <vm/vm_zone.h>
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#include <net/if.h>
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#include <net/route.h>
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#define _IP_VHL
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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/in_pcb.h>
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#include <netinet/in_var.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_fw.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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#include "opt_ipdn.h"
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#ifdef DUMMYNET
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#include <netinet/ip_dummynet.h>
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#endif
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struct inpcbhead ripcb;
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struct inpcbinfo ripcbinfo;
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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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LIST_INIT(&ripcb);
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ripcbinfo.listhead = &ripcb;
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/*
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* XXX We don't use the hash list for raw IP, but it's easier
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* to allocate a one entry hash list than it is to check all
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* over the place for hashbase == NULL.
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*/
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ripcbinfo.hashbase = hashinit(1, M_PCB, &ripcbinfo.hashmask);
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ripcbinfo.porthashbase = hashinit(1, M_PCB, &ripcbinfo.porthashmask);
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ripcbinfo.ipi_zone = zinit("ripcb", sizeof(struct inpcb),
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maxsockets, ZONE_INTERRUPT, 0);
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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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rip_input(m, off, proto)
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struct mbuf *m;
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int off, proto;
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{
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register struct ip *ip = mtod(m, struct ip *);
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register struct inpcb *inp;
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struct inpcb *last = 0;
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struct mbuf *opts = 0;
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ripsrc.sin_addr = ip->ip_src;
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LIST_FOREACH(inp, &ripcb, inp_list) {
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#ifdef INET6
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if ((inp->inp_vflag & INP_IPV4) == 0)
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continue;
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#endif
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if (inp->inp_ip_p && inp->inp_ip_p != proto)
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continue;
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if (inp->inp_laddr.s_addr &&
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inp->inp_laddr.s_addr != ip->ip_dst.s_addr)
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continue;
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if (inp->inp_faddr.s_addr &&
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inp->inp_faddr.s_addr != ip->ip_src.s_addr)
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continue;
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if (last) {
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struct mbuf *n = m_copy(m, 0, (int)M_COPYALL);
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if (n) {
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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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(struct sockaddr *)&ripsrc, n,
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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 = 0;
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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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(struct sockaddr *)&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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m_freem(m);
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ipstat.ips_noproto++;
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ipstat.ips_delivered--;
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}
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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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rip_output(m, so, dst)
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struct mbuf *m;
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struct socket *so;
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u_long dst;
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{
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register struct ip *ip;
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register struct inpcb *inp = sotoinpcb(so);
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int flags = (so->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST;
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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_TRYWAIT);
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ip = mtod(m, struct ip *);
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ip->ip_tos = inp->inp_ip_tos;
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ip->ip_off = 0;
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ip->ip_p = inp->inp_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.s_addr = dst;
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ip->ip_ttl = inp->inp_ip_ttl;
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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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/* don't allow both user specified and setsockopt options,
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and don't allow packet length sizes that will crash */
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if (((IP_VHL_HL(ip->ip_vhl) != (sizeof (*ip) >> 2))
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&& inp->inp_options)
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|| (ip->ip_len > m->m_pkthdr.len)
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|| (ip->ip_len < (IP_VHL_HL(ip->ip_vhl) << 2))) {
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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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/* 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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ipsec_setsocket(m, so);
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#endif /*IPSEC*/
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return (ip_output(m, inp->inp_options, &inp->inp_route, flags,
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inp->inp_moptions));
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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(so, sopt)
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struct socket *so;
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struct sockopt *sopt;
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{
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struct inpcb *inp = sotoinpcb(so);
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int error, optval;
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if (sopt->sopt_level != IPPROTO_IP)
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return (EINVAL);
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error = 0;
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switch (sopt->sopt_dir) {
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case SOPT_GET:
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switch (sopt->sopt_name) {
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case IP_HDRINCL:
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optval = inp->inp_flags & INP_HDRINCL;
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error = sooptcopyout(sopt, &optval, sizeof optval);
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break;
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case IP_FW_ADD:
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case IP_FW_GET:
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if (ip_fw_ctl_ptr == 0)
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error = ENOPROTOOPT;
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else
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error = ip_fw_ctl_ptr(sopt);
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break;
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#ifdef DUMMYNET
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case IP_DUMMYNET_GET:
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if (ip_dn_ctl_ptr == NULL)
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error = ENOPROTOOPT ;
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else
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error = ip_dn_ctl_ptr(sopt);
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break ;
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#endif /* DUMMYNET */
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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_VERSION:
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case MRT_ASSERT:
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error = ip_mrouter_get(so, sopt);
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break;
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default:
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error = ip_ctloutput(so, sopt);
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break;
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}
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break;
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case SOPT_SET:
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switch (sopt->sopt_name) {
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case IP_HDRINCL:
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error = sooptcopyin(sopt, &optval, sizeof optval,
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sizeof optval);
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if (error)
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break;
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if (optval)
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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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break;
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case IP_FW_ADD:
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case IP_FW_DEL:
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case IP_FW_FLUSH:
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case IP_FW_ZERO:
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case IP_FW_RESETLOG:
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if (ip_fw_ctl_ptr == 0)
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error = ENOPROTOOPT;
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else
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error = ip_fw_ctl_ptr(sopt);
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break;
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#ifdef DUMMYNET
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case IP_DUMMYNET_CONFIGURE:
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case IP_DUMMYNET_DEL:
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case IP_DUMMYNET_FLUSH:
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if (ip_dn_ctl_ptr == NULL)
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error = ENOPROTOOPT ;
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else
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error = ip_dn_ctl_ptr(sopt);
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break ;
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#endif
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case IP_RSVP_ON:
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error = ip_rsvp_init(so);
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break;
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case IP_RSVP_OFF:
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error = ip_rsvp_done();
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break;
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/* XXX - should be combined */
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case IP_RSVP_VIF_ON:
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error = ip_rsvp_vif_init(so, sopt);
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break;
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case IP_RSVP_VIF_OFF:
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error = ip_rsvp_vif_done(so, sopt);
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break;
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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_VERSION:
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case MRT_ASSERT:
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error = ip_mrouter_set(so, sopt);
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break;
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default:
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error = ip_ctloutput(so, sopt);
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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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/*
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* This function exists solely to receive the PRC_IFDOWN messages which
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* are sent by if_down(). It looks for an ifaddr whose ifa_addr is sa,
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* and calls in_ifadown() to remove all routes corresponding to that address.
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* It also receives the PRC_IFUP messages from if_up() and reinstalls the
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* interface routes.
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*/
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void
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rip_ctlinput(cmd, sa, vip)
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int cmd;
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struct sockaddr *sa;
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void *vip;
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{
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struct in_ifaddr *ia;
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struct ifnet *ifp;
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int err;
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int flags;
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switch (cmd) {
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case PRC_IFDOWN:
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TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) {
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if (ia->ia_ifa.ifa_addr == sa
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&& (ia->ia_flags & IFA_ROUTE)) {
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/*
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* in_ifscrub kills the interface route.
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*/
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in_ifscrub(ia->ia_ifp, ia);
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/*
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* in_ifadown gets rid of all the rest of
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* the routes. This is not quite the right
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* thing to do, but at least if we are running
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* a routing process they will come back.
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*/
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in_ifadown(&ia->ia_ifa);
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break;
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}
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}
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break;
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case PRC_IFUP:
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TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) {
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if (ia->ia_ifa.ifa_addr == sa)
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break;
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}
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if (ia == 0 || (ia->ia_flags & IFA_ROUTE))
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return;
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flags = RTF_UP;
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ifp = ia->ia_ifa.ifa_ifp;
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if ((ifp->if_flags & IFF_LOOPBACK)
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|| (ifp->if_flags & IFF_POINTOPOINT))
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flags |= RTF_HOST;
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err = rtinit(&ia->ia_ifa, RTM_ADD, flags);
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if (err == 0)
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ia->ia_flags |= IFA_ROUTE;
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break;
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}
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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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SYSCTL_INT(_net_inet_raw, OID_AUTO, maxdgram, CTLFLAG_RW,
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&rip_sendspace, 0, "Maximum outgoing raw IP datagram size");
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SYSCTL_INT(_net_inet_raw, OID_AUTO, recvspace, CTLFLAG_RW,
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&rip_recvspace, 0, "Maximum incoming raw IP datagram size");
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static int
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rip_attach(struct socket *so, int proto, struct proc *p)
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{
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struct inpcb *inp;
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int error, s;
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inp = sotoinpcb(so);
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if (inp)
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panic("rip_attach");
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if (p && (error = suser(p)) != 0)
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return error;
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error = soreserve(so, rip_sendspace, rip_recvspace);
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if (error)
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return error;
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s = splnet();
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error = in_pcballoc(so, &ripcbinfo, p);
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splx(s);
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if (error)
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return error;
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inp = (struct inpcb *)so->so_pcb;
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inp->inp_vflag |= INP_IPV4;
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inp->inp_ip_p = proto;
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inp->inp_ip_ttl = ip_defttl;
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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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return error;
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}
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#endif /*IPSEC*/
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return 0;
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}
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static int
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rip_detach(struct socket *so)
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{
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struct inpcb *inp;
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inp = sotoinpcb(so);
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if (inp == 0)
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panic("rip_detach");
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if (so == ip_mrouter)
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ip_mrouter_done();
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ip_rsvp_force_done(so);
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if (so == ip_rsvpd)
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ip_rsvp_done();
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in_pcbdetach(inp);
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return 0;
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}
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static int
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rip_abort(struct socket *so)
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{
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soisdisconnected(so);
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return rip_detach(so);
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}
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static int
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rip_disconnect(struct socket *so)
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{
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if ((so->so_state & SS_ISCONNECTED) == 0)
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return ENOTCONN;
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return rip_abort(so);
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}
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static int
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rip_bind(struct socket *so, struct sockaddr *nam, struct proc *p)
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{
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struct inpcb *inp = sotoinpcb(so);
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struct sockaddr_in *addr = (struct sockaddr_in *)nam;
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if (nam->sa_len != sizeof(*addr))
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return EINVAL;
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if (TAILQ_EMPTY(&ifnet) || ((addr->sin_family != AF_INET) &&
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(addr->sin_family != AF_IMPLINK)) ||
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(addr->sin_addr.s_addr &&
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ifa_ifwithaddr((struct sockaddr *)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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static int
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rip_connect(struct socket *so, struct sockaddr *nam, struct proc *p)
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{
|
|
struct inpcb *inp = sotoinpcb(so);
|
|
struct sockaddr_in *addr = (struct sockaddr_in *)nam;
|
|
|
|
if (nam->sa_len != sizeof(*addr))
|
|
return EINVAL;
|
|
if (TAILQ_EMPTY(&ifnet))
|
|
return EADDRNOTAVAIL;
|
|
if ((addr->sin_family != AF_INET) &&
|
|
(addr->sin_family != AF_IMPLINK))
|
|
return EAFNOSUPPORT;
|
|
inp->inp_faddr = addr->sin_addr;
|
|
soisconnected(so);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
rip_shutdown(struct socket *so)
|
|
{
|
|
socantsendmore(so);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
rip_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
|
|
struct mbuf *control, struct proc *p)
|
|
{
|
|
struct inpcb *inp = sotoinpcb(so);
|
|
register u_long dst;
|
|
|
|
if (so->so_state & SS_ISCONNECTED) {
|
|
if (nam) {
|
|
m_freem(m);
|
|
return EISCONN;
|
|
}
|
|
dst = inp->inp_faddr.s_addr;
|
|
} else {
|
|
if (nam == NULL) {
|
|
m_freem(m);
|
|
return ENOTCONN;
|
|
}
|
|
dst = ((struct sockaddr_in *)nam)->sin_addr.s_addr;
|
|
}
|
|
return rip_output(m, so, dst);
|
|
}
|
|
|
|
static int
|
|
rip_pcblist(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
int error, i, n, s;
|
|
struct inpcb *inp, **inp_list;
|
|
inp_gen_t gencnt;
|
|
struct xinpgen xig;
|
|
|
|
/*
|
|
* The process of preparing the TCB list is too time-consuming and
|
|
* resource-intensive to repeat twice on every request.
|
|
*/
|
|
if (req->oldptr == 0) {
|
|
n = ripcbinfo.ipi_count;
|
|
req->oldidx = 2 * (sizeof xig)
|
|
+ (n + n/8) * sizeof(struct xinpcb);
|
|
return 0;
|
|
}
|
|
|
|
if (req->newptr != 0)
|
|
return EPERM;
|
|
|
|
/*
|
|
* OK, now we're committed to doing something.
|
|
*/
|
|
s = splnet();
|
|
gencnt = ripcbinfo.ipi_gencnt;
|
|
n = ripcbinfo.ipi_count;
|
|
splx(s);
|
|
|
|
xig.xig_len = sizeof xig;
|
|
xig.xig_count = n;
|
|
xig.xig_gen = gencnt;
|
|
xig.xig_sogen = so_gencnt;
|
|
error = SYSCTL_OUT(req, &xig, sizeof xig);
|
|
if (error)
|
|
return error;
|
|
|
|
inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK);
|
|
if (inp_list == 0)
|
|
return ENOMEM;
|
|
|
|
s = splnet();
|
|
for (inp = LIST_FIRST(ripcbinfo.listhead), i = 0; inp && i < n;
|
|
inp = LIST_NEXT(inp, inp_list)) {
|
|
if (inp->inp_gencnt <= gencnt)
|
|
inp_list[i++] = inp;
|
|
}
|
|
splx(s);
|
|
n = i;
|
|
|
|
error = 0;
|
|
for (i = 0; i < n; i++) {
|
|
inp = inp_list[i];
|
|
if (inp->inp_gencnt <= gencnt) {
|
|
struct xinpcb xi;
|
|
xi.xi_len = sizeof xi;
|
|
/* XXX should avoid extra copy */
|
|
bcopy(inp, &xi.xi_inp, sizeof *inp);
|
|
if (inp->inp_socket)
|
|
sotoxsocket(inp->inp_socket, &xi.xi_socket);
|
|
error = SYSCTL_OUT(req, &xi, sizeof xi);
|
|
}
|
|
}
|
|
if (!error) {
|
|
/*
|
|
* Give the user an updated idea of our state.
|
|
* If the generation differs from what we told
|
|
* her before, she knows that something happened
|
|
* while we were processing this request, and it
|
|
* might be necessary to retry.
|
|
*/
|
|
s = splnet();
|
|
xig.xig_gen = ripcbinfo.ipi_gencnt;
|
|
xig.xig_sogen = so_gencnt;
|
|
xig.xig_count = ripcbinfo.ipi_count;
|
|
splx(s);
|
|
error = SYSCTL_OUT(req, &xig, sizeof xig);
|
|
}
|
|
free(inp_list, M_TEMP);
|
|
return error;
|
|
}
|
|
|
|
SYSCTL_PROC(_net_inet_raw, OID_AUTO/*XXX*/, pcblist, CTLFLAG_RD, 0, 0,
|
|
rip_pcblist, "S,xinpcb", "List of active raw IP sockets");
|
|
|
|
struct pr_usrreqs rip_usrreqs = {
|
|
rip_abort, pru_accept_notsupp, rip_attach, rip_bind, rip_connect,
|
|
pru_connect2_notsupp, in_control, rip_detach, rip_disconnect,
|
|
pru_listen_notsupp, in_setpeeraddr, pru_rcvd_notsupp,
|
|
pru_rcvoob_notsupp, rip_send, pru_sense_null, rip_shutdown,
|
|
in_setsockaddr, sosend, soreceive, sopoll
|
|
};
|