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|
/* $OpenBSD: raw_ip.c,v 1.42 2008/05/09 02:44:54 markus Exp $ */
/* $NetBSD: raw_ip.c,v 1.25 1996/02/18 18:58:33 christos Exp $ */
/*
* 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. 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.
*
* @(#)COPYRIGHT 1.1 (NRL) 17 January 1995
*
* NRL grants permission for redistribution and use in source and binary
* forms, with or without modification, of the software and documentation
* created at NRL 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 acknowledgements:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* This product includes software developed at the Information
* Technology Division, US Naval Research Laboratory.
* 4. Neither the name of the NRL nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THE SOFTWARE PROVIDED BY NRL IS PROVIDED BY NRL 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 NRL 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.
*
* The views and conclusions contained in the software and documentation
* are those of the authors and should not be interpreted as representing
* official policies, either expressed or implied, of the US Naval
* Research Laboratory (NRL).
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/protosw.h>
#include <sys/socketvar.h>
#include <net/if.h>
#include <net/route.h>
#include <net/pfvar.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/ip_mroute.h>
#include <netinet/ip_var.h>
#include <netinet/in_pcb.h>
#include <netinet/in_var.h>
#include <netinet/ip_icmp.h>
struct inpcbtable rawcbtable;
/*
* 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);
}
struct sockaddr_in ripsrc = { sizeof(ripsrc), AF_INET };
/*
* Setup generic address and protocol structures
* for raw_input routine, then pass them along with
* mbuf chain.
*/
void
rip_input(struct mbuf *m, ...)
{
struct ip *ip = mtod(m, struct ip *);
struct inpcb *inp, *last = NULL;
struct mbuf *opts = NULL;
ripsrc.sin_addr = ip->ip_src;
CIRCLEQ_FOREACH(inp, &rawcbtable.inpt_queue, inp_queue) {
#ifdef INET6
if (inp->inp_flags & INP_IPV6)
continue;
#endif
if (inp->inp_ip.ip_p && inp->inp_ip.ip_p != ip->ip_p)
continue;
#if NPF
if (m->m_pkthdr.pf.flags & PF_TAG_DIVERTED) {
struct pf_divert *divert;
if ((divert = pf_find_divert(m)) == NULL)
continue;
if (inp->inp_laddr.s_addr != divert->addr.ipv4.s_addr)
continue;
} else
#endif
if (inp->inp_laddr.s_addr &&
inp->inp_laddr.s_addr != ip->ip_dst.s_addr)
continue;
if (inp->inp_faddr.s_addr &&
inp->inp_faddr.s_addr != ip->ip_src.s_addr)
continue;
if (last) {
struct mbuf *n;
if ((n = m_copy(m, 0, (int)M_COPYALL)) != 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;
}
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 (ip->ip_p != IPPROTO_ICMP)
icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PROTOCOL, 0, 0);
else
m_freem(m);
ipstat.ips_noproto++;
ipstat.ips_delivered--;
}
}
/*
* Generate IP header and pass packet to ip_output.
* Tack on options user may have setup with control call.
*/
int
rip_output(struct mbuf *m, ...)
{
struct socket *so;
u_long dst;
struct ip *ip;
struct inpcb *inp;
int flags;
va_list ap;
va_start(ap, m);
so = va_arg(ap, struct socket *);
dst = va_arg(ap, u_long);
va_end(ap);
inp = sotoinpcb(so);
flags = (so->so_options & (SO_DONTROUTE|SO_JUMBO)) | IP_ALLOWBROADCAST;
/*
* If the user handed us a complete IP packet, use it.
* Otherwise, allocate an mbuf for a header and fill it in.
*/
if ((inp->inp_flags & INP_HDRINCL) == 0) {
if ((m->m_pkthdr.len + sizeof(struct ip)) > IP_MAXPACKET) {
m_freem(m);
return (EMSGSIZE);
}
M_PREPEND(m, sizeof(struct ip), M_DONTWAIT);
if (!m)
return (ENOBUFS);
ip = mtod(m, struct ip *);
ip->ip_tos = inp->inp_ip.ip_tos;
ip->ip_off = htons(0);
ip->ip_p = inp->inp_ip.ip_p;
ip->ip_len = htons(m->m_pkthdr.len);
ip->ip_src = inp->inp_laddr;
ip->ip_dst.s_addr = dst;
ip->ip_ttl = inp->inp_ip.ip_ttl ? inp->inp_ip.ip_ttl : MAXTTL;
} else {
if (m->m_pkthdr.len > IP_MAXPACKET) {
m_freem(m);
return (EMSGSIZE);
}
if (m->m_pkthdr.len < sizeof(struct ip)) {
m_freem(m);
return (EINVAL);
}
ip = mtod(m, struct ip *);
/*
* don't allow both user specified and setsockopt options,
* and don't allow packet length sizes that will crash
*/
if ((ip->ip_hl != (sizeof (*ip) >> 2) && inp->inp_options) ||
ntohs(ip->ip_len) > m->m_pkthdr.len ||
ntohs(ip->ip_len) < ip->ip_hl << 2) {
m_freem(m);
return (EINVAL);
}
if (ip->ip_id == 0) {
ip->ip_id = htons(ip_randomid());
}
/* XXX prevent ip_output from overwriting header fields */
flags |= IP_RAWOUTPUT;
ipstat.ips_rawout++;
}
#ifdef INET6
/*
* A thought: Even though raw IP shouldn't be able to set IPv6
* multicast options, if it does, the last parameter to
* ip_output should be guarded against v6/v4 problems.
*/
#endif
return (ip_output(m, inp->inp_options, &inp->inp_route, flags,
inp->inp_moptions, inp));
}
/*
* Raw IP socket option processing.
*/
int
rip_ctloutput(int op, struct socket *so, int level, int optname,
struct mbuf **m)
{
struct inpcb *inp = sotoinpcb(so);
int error;
if (level != IPPROTO_IP) {
if (op == PRCO_SETOPT && *m)
(void) m_free(*m);
return (EINVAL);
}
switch (optname) {
case IP_HDRINCL:
error = 0;
if (op == PRCO_SETOPT) {
if (*m == 0 || (*m)->m_len < sizeof (int))
error = EINVAL;
else if (*mtod(*m, int *))
inp->inp_flags |= INP_HDRINCL;
else
inp->inp_flags &= ~INP_HDRINCL;
if (*m)
(void)m_free(*m);
} else {
*m = m_get(M_WAIT, M_SOOPTS);
(*m)->m_len = sizeof(int);
*mtod(*m, int *) = inp->inp_flags & INP_HDRINCL;
}
return (error);
case MRT_INIT:
case MRT_DONE:
case MRT_ADD_VIF:
case MRT_DEL_VIF:
case MRT_ADD_MFC:
case MRT_DEL_MFC:
case MRT_VERSION:
case MRT_ASSERT:
case MRT_API_SUPPORT:
case MRT_API_CONFIG:
case MRT_ADD_BW_UPCALL:
case MRT_DEL_BW_UPCALL:
#ifdef MROUTING
switch (op) {
case PRCO_SETOPT:
error = ip_mrouter_set(so, optname, m);
break;
case PRCO_GETOPT:
error = ip_mrouter_get(so, optname, m);
break;
default:
error = EINVAL;
break;
}
return (error);
#else
if (op == PRCO_SETOPT && *m)
m_free(*m);
return (EOPNOTSUPP);
#endif
}
return (ip_ctloutput(op, so, level, optname, m));
}
u_long rip_sendspace = RIPSNDQ;
u_long rip_recvspace = RIPRCVQ;
/*ARGSUSED*/
int
rip_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *nam,
struct mbuf *control)
{
int error = 0;
struct inpcb *inp = sotoinpcb(so);
#ifdef MROUTING
extern struct socket *ip_mrouter;
#endif
if (req == PRU_CONTROL)
return (in_control(so, (u_long)m, (caddr_t)nam,
(struct ifnet *)control));
if (inp == NULL && req != PRU_ATTACH) {
error = EINVAL;
goto release;
}
switch (req) {
case PRU_ATTACH:
if (inp)
panic("rip_attach");
if ((so->so_state & SS_PRIV) == 0) {
error = EACCES;
break;
}
if ((error = soreserve(so, rip_sendspace, rip_recvspace)) ||
(error = in_pcballoc(so, &rawcbtable)))
break;
inp = (struct inpcb *)so->so_pcb;
inp->inp_ip.ip_p = (long)nam;
break;
case PRU_DISCONNECT:
if ((so->so_state & SS_ISCONNECTED) == 0) {
error = ENOTCONN;
break;
}
/* FALLTHROUGH */
case PRU_ABORT:
soisdisconnected(so);
/* FALLTHROUGH */
case PRU_DETACH:
if (inp == 0)
panic("rip_detach");
#ifdef MROUTING
if (so == ip_mrouter)
ip_mrouter_done();
#endif
in_pcbdetach(inp);
break;
case PRU_BIND:
{
struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *);
if (nam->m_len != sizeof(*addr)) {
error = EINVAL;
break;
}
if ((TAILQ_EMPTY(&ifnet)) ||
((addr->sin_family != AF_INET) &&
(addr->sin_family != AF_IMPLINK)) ||
(addr->sin_addr.s_addr &&
ifa_ifwithaddr(sintosa(addr)) == 0)) {
error = EADDRNOTAVAIL;
break;
}
inp->inp_laddr = addr->sin_addr;
break;
}
case PRU_CONNECT:
{
struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *);
if (nam->m_len != sizeof(*addr)) {
error = EINVAL;
break;
}
if (TAILQ_EMPTY(&ifnet)) {
error = EADDRNOTAVAIL;
break;
}
if ((addr->sin_family != AF_INET) &&
(addr->sin_family != AF_IMPLINK)) {
error = EAFNOSUPPORT;
break;
}
inp->inp_faddr = addr->sin_addr;
soisconnected(so);
break;
}
case PRU_CONNECT2:
error = EOPNOTSUPP;
break;
/*
* Mark the connection as being incapable of further input.
*/
case PRU_SHUTDOWN:
socantsendmore(so);
break;
/*
* Ship a packet out. The appropriate raw output
* routine handles any massaging necessary.
*/
case PRU_SEND:
{
u_int32_t dst;
if (so->so_state & SS_ISCONNECTED) {
if (nam) {
error = EISCONN;
break;
}
dst = inp->inp_faddr.s_addr;
} else {
if (nam == NULL) {
error = ENOTCONN;
break;
}
dst = mtod(nam, struct sockaddr_in *)->sin_addr.s_addr;
}
#ifdef IPSEC
/* XXX Find an IPsec TDB */
#endif
error = rip_output(m, so, dst);
m = NULL;
break;
}
case PRU_SENSE:
/*
* stat: don't bother with a blocksize.
*/
return (0);
/*
* Not supported.
*/
case PRU_RCVOOB:
case PRU_RCVD:
case PRU_LISTEN:
case PRU_ACCEPT:
case PRU_SENDOOB:
error = EOPNOTSUPP;
break;
case PRU_SOCKADDR:
in_setsockaddr(inp, nam);
break;
case PRU_PEERADDR:
in_setpeeraddr(inp, nam);
break;
default:
panic("rip_usrreq");
}
release:
if (m != NULL)
m_freem(m);
return (error);
}
|