604 lines
14 KiB
C
604 lines
14 KiB
C
/* $NetBSD: raw_ip.c,v 1.57 2001/07/25 23:28:02 itojun Exp $ */
|
|
|
|
/*
|
|
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the project nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
/*
|
|
* 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
|
|
*/
|
|
|
|
#include "opt_ipsec.h"
|
|
#include "opt_mrouting.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/mbuf.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/protosw.h>
|
|
#include <sys/socketvar.h>
|
|
#include <sys/errno.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/proc.h>
|
|
|
|
#include <net/if.h>
|
|
#include <net/route.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/ip_icmp.h>
|
|
#include <netinet/in_pcb.h>
|
|
#include <netinet/in_var.h>
|
|
|
|
#include <machine/stdarg.h>
|
|
|
|
#ifdef IPSEC
|
|
#include <netinet6/ipsec.h>
|
|
#endif /*IPSEC*/
|
|
|
|
struct inpcbtable rawcbtable;
|
|
|
|
int rip_bind __P((struct inpcb *, struct mbuf *));
|
|
int rip_connect __P((struct inpcb *, struct mbuf *));
|
|
void rip_disconnect __P((struct inpcb *));
|
|
|
|
/*
|
|
* 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()
|
|
{
|
|
|
|
in_pcbinit(&rawcbtable, 1, 1);
|
|
}
|
|
|
|
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
|
|
#if __STDC__
|
|
rip_input(struct mbuf *m, ...)
|
|
#else
|
|
rip_input(m, va_alist)
|
|
struct mbuf *m;
|
|
va_dcl
|
|
#endif
|
|
{
|
|
int off, proto;
|
|
struct ip *ip = mtod(m, struct ip *);
|
|
struct inpcb *inp;
|
|
struct inpcb *last = 0;
|
|
struct mbuf *opts = 0;
|
|
struct sockaddr_in ripsrc;
|
|
va_list ap;
|
|
|
|
va_start(ap, m);
|
|
off = va_arg(ap, int);
|
|
proto = va_arg(ap, int);
|
|
va_end(ap);
|
|
|
|
ripsrc.sin_family = AF_INET;
|
|
ripsrc.sin_len = sizeof(struct sockaddr_in);
|
|
ripsrc.sin_addr = ip->ip_src;
|
|
ripsrc.sin_port = 0;
|
|
bzero((caddr_t)ripsrc.sin_zero, sizeof(ripsrc.sin_zero));
|
|
|
|
/*
|
|
* XXX Compatibility: programs using raw IP expect ip_len
|
|
* XXX to have the header length subtracted.
|
|
*/
|
|
ip->ip_len -= ip->ip_hl << 2;
|
|
|
|
for (inp = rawcbtable.inpt_queue.cqh_first;
|
|
inp != (struct inpcb *)&rawcbtable.inpt_queue;
|
|
inp = inp->inp_queue.cqe_next) {
|
|
if (inp->inp_ip.ip_p && inp->inp_ip.ip_p != proto)
|
|
continue;
|
|
if (!in_nullhost(inp->inp_laddr) &&
|
|
!in_hosteq(inp->inp_laddr, ip->ip_dst))
|
|
continue;
|
|
if (!in_nullhost(inp->inp_faddr) &&
|
|
!in_hosteq(inp->inp_faddr, ip->ip_src))
|
|
continue;
|
|
if (last) {
|
|
struct mbuf *n;
|
|
|
|
#ifdef IPSEC
|
|
/* check AH/ESP integrity. */
|
|
if (ipsec4_in_reject_so(m, last->inp_socket)) {
|
|
ipsecstat.in_polvio++;
|
|
/* do not inject data to pcb */
|
|
} else
|
|
#endif /*IPSEC*/
|
|
if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
|
|
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,
|
|
sintosa(&ripsrc), n, opts) == 0) {
|
|
/* should notify about lost packet */
|
|
m_freem(n);
|
|
if (opts)
|
|
m_freem(opts);
|
|
} else
|
|
sorwakeup(last->inp_socket);
|
|
opts = NULL;
|
|
}
|
|
}
|
|
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,
|
|
sintosa(&ripsrc), m, opts) == 0) {
|
|
m_freem(m);
|
|
if (opts)
|
|
m_freem(opts);
|
|
} else
|
|
sorwakeup(last->inp_socket);
|
|
} else {
|
|
if (inetsw[ip_protox[ip->ip_p]].pr_input == rip_input) {
|
|
icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PROTOCOL,
|
|
0, 0);
|
|
ipstat.ips_noproto++;
|
|
ipstat.ips_delivered--;
|
|
} else
|
|
m_freem(m);
|
|
}
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Generate IP header and pass packet to ip_output.
|
|
* Tack on options user may have setup with control call.
|
|
*/
|
|
int
|
|
#if __STDC__
|
|
rip_output(struct mbuf *m, ...)
|
|
#else
|
|
rip_output(m, va_alist)
|
|
struct mbuf *m;
|
|
va_dcl
|
|
#endif
|
|
{
|
|
struct inpcb *inp;
|
|
struct ip *ip;
|
|
struct mbuf *opts;
|
|
int flags;
|
|
va_list ap;
|
|
|
|
va_start(ap, m);
|
|
inp = va_arg(ap, struct inpcb *);
|
|
va_end(ap);
|
|
|
|
flags =
|
|
(inp->inp_socket->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST
|
|
| IP_RETURNMTU;
|
|
|
|
/*
|
|
* 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 = 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 = inp->inp_faddr;
|
|
ip->ip_ttl = MAXTTL;
|
|
opts = inp->inp_options;
|
|
} else {
|
|
if (m->m_pkthdr.len > IP_MAXPACKET) {
|
|
m_freem(m);
|
|
return (EMSGSIZE);
|
|
}
|
|
ip = mtod(m, struct ip *);
|
|
if (m->m_pkthdr.len != ip->ip_len) {
|
|
m_freem(m);
|
|
return (EINVAL);
|
|
}
|
|
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++;
|
|
}
|
|
#ifdef IPSEC
|
|
if (ipsec_setsocket(m, inp->inp_socket) != 0) {
|
|
m_freem(m);
|
|
return ENOBUFS;
|
|
}
|
|
#endif /*IPSEC*/
|
|
return (ip_output(m, opts, &inp->inp_route, flags, inp->inp_moptions, &inp->inp_errormtu));
|
|
}
|
|
|
|
/*
|
|
* Raw IP socket option processing.
|
|
*/
|
|
int
|
|
rip_ctloutput(op, so, level, optname, m)
|
|
int op;
|
|
struct socket *so;
|
|
int level, optname;
|
|
struct mbuf **m;
|
|
{
|
|
struct inpcb *inp = sotoinpcb(so);
|
|
int error = 0;
|
|
|
|
if (level != IPPROTO_IP) {
|
|
error = ENOPROTOOPT;
|
|
if (op == PRCO_SETOPT && *m != 0)
|
|
(void) m_free(*m);
|
|
} else switch (op) {
|
|
|
|
case PRCO_SETOPT:
|
|
switch (optname) {
|
|
case IP_HDRINCL:
|
|
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 != 0)
|
|
(void) m_free(*m);
|
|
break;
|
|
|
|
#ifdef MROUTING
|
|
case MRT_INIT:
|
|
case MRT_DONE:
|
|
case MRT_ADD_VIF:
|
|
case MRT_DEL_VIF:
|
|
case MRT_ADD_MFC:
|
|
case MRT_DEL_MFC:
|
|
case MRT_ASSERT:
|
|
error = ip_mrouter_set(so, optname, m);
|
|
break;
|
|
#endif
|
|
|
|
default:
|
|
error = ip_ctloutput(op, so, level, optname, m);
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case PRCO_GETOPT:
|
|
switch (optname) {
|
|
case IP_HDRINCL:
|
|
*m = m_get(M_WAIT, M_SOOPTS);
|
|
(*m)->m_len = sizeof (int);
|
|
*mtod(*m, int *) = inp->inp_flags & INP_HDRINCL ? 1 : 0;
|
|
break;
|
|
|
|
#ifdef MROUTING
|
|
case MRT_VERSION:
|
|
case MRT_ASSERT:
|
|
error = ip_mrouter_get(so, optname, m);
|
|
break;
|
|
#endif
|
|
|
|
default:
|
|
error = ip_ctloutput(op, so, level, optname, m);
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
rip_bind(inp, nam)
|
|
struct inpcb *inp;
|
|
struct mbuf *nam;
|
|
{
|
|
struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *);
|
|
|
|
if (nam->m_len != sizeof(*addr))
|
|
return (EINVAL);
|
|
if (ifnet.tqh_first == 0)
|
|
return (EADDRNOTAVAIL);
|
|
if (addr->sin_family != AF_INET &&
|
|
addr->sin_family != AF_IMPLINK)
|
|
return (EAFNOSUPPORT);
|
|
if (!in_nullhost(addr->sin_addr) &&
|
|
ifa_ifwithaddr(sintosa(addr)) == 0)
|
|
return (EADDRNOTAVAIL);
|
|
inp->inp_laddr = addr->sin_addr;
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
rip_connect(inp, nam)
|
|
struct inpcb *inp;
|
|
struct mbuf *nam;
|
|
{
|
|
struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *);
|
|
|
|
if (nam->m_len != sizeof(*addr))
|
|
return (EINVAL);
|
|
if (ifnet.tqh_first == 0)
|
|
return (EADDRNOTAVAIL);
|
|
if (addr->sin_family != AF_INET &&
|
|
addr->sin_family != AF_IMPLINK)
|
|
return (EAFNOSUPPORT);
|
|
inp->inp_faddr = addr->sin_addr;
|
|
return (0);
|
|
}
|
|
|
|
void
|
|
rip_disconnect(inp)
|
|
struct inpcb *inp;
|
|
{
|
|
|
|
inp->inp_faddr = zeroin_addr;
|
|
}
|
|
|
|
u_long rip_sendspace = RIPSNDQ;
|
|
u_long rip_recvspace = RIPRCVQ;
|
|
|
|
/*ARGSUSED*/
|
|
int
|
|
rip_usrreq(so, req, m, nam, control, p)
|
|
struct socket *so;
|
|
int req;
|
|
struct mbuf *m, *nam, *control;
|
|
struct proc *p;
|
|
{
|
|
struct inpcb *inp;
|
|
int s;
|
|
int error = 0;
|
|
#ifdef MROUTING
|
|
extern struct socket *ip_mrouter;
|
|
#endif
|
|
|
|
if (req == PRU_CONTROL)
|
|
return (in_control(so, (long)m, (caddr_t)nam,
|
|
(struct ifnet *)control, p));
|
|
|
|
if (req == PRU_PURGEIF) {
|
|
in_pcbpurgeif0(&rawcbtable, (struct ifnet *)control);
|
|
in_purgeif((struct ifnet *)control);
|
|
in_pcbpurgeif(&rawcbtable, (struct ifnet *)control);
|
|
return (0);
|
|
}
|
|
|
|
s = splsoftnet();
|
|
inp = sotoinpcb(so);
|
|
#ifdef DIAGNOSTIC
|
|
if (req != PRU_SEND && req != PRU_SENDOOB && control)
|
|
panic("rip_usrreq: unexpected control mbuf");
|
|
#endif
|
|
if (inp == 0 && req != PRU_ATTACH) {
|
|
error = EINVAL;
|
|
goto release;
|
|
}
|
|
|
|
switch (req) {
|
|
|
|
case PRU_ATTACH:
|
|
if (inp != 0) {
|
|
error = EISCONN;
|
|
break;
|
|
}
|
|
if (p == 0 || (error = suser(p->p_ucred, &p->p_acflag))) {
|
|
error = EACCES;
|
|
break;
|
|
}
|
|
if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
|
|
error = soreserve(so, rip_sendspace, rip_recvspace);
|
|
if (error)
|
|
break;
|
|
}
|
|
error = in_pcballoc(so, &rawcbtable);
|
|
if (error)
|
|
break;
|
|
inp = sotoinpcb(so);
|
|
inp->inp_ip.ip_p = (long)nam;
|
|
break;
|
|
|
|
case PRU_DETACH:
|
|
#ifdef MROUTING
|
|
if (so == ip_mrouter)
|
|
ip_mrouter_done();
|
|
#endif
|
|
in_pcbdetach(inp);
|
|
break;
|
|
|
|
case PRU_BIND:
|
|
error = rip_bind(inp, nam);
|
|
break;
|
|
|
|
case PRU_LISTEN:
|
|
error = EOPNOTSUPP;
|
|
break;
|
|
|
|
case PRU_CONNECT:
|
|
error = rip_connect(inp, nam);
|
|
if (error)
|
|
break;
|
|
soisconnected(so);
|
|
break;
|
|
|
|
case PRU_CONNECT2:
|
|
error = EOPNOTSUPP;
|
|
break;
|
|
|
|
case PRU_DISCONNECT:
|
|
soisdisconnected(so);
|
|
rip_disconnect(inp);
|
|
break;
|
|
|
|
/*
|
|
* Mark the connection as being incapable of further input.
|
|
*/
|
|
case PRU_SHUTDOWN:
|
|
socantsendmore(so);
|
|
break;
|
|
|
|
case PRU_RCVD:
|
|
error = EOPNOTSUPP;
|
|
break;
|
|
|
|
/*
|
|
* 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);
|
|
}
|