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NetBSD/sys/netinet/raw_ip.c

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/* $NetBSD: raw_ip.c,v 1.96 2007/03/04 06:03:21 christos 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. 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 <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: raw_ip.c,v 1.96 2007/03/04 06:03:21 christos Exp $");
#include "opt_inet.h"
#include "opt_ipsec.h"
#include "opt_mrouting.h"
#include <sys/param.h>
#include <sys/sysctl.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 <sys/kauth.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_proto.h>
#include <netinet/in_var.h>
#include <machine/stdarg.h>
#ifdef IPSEC
#include <netinet6/ipsec.h>
#endif /*IPSEC*/
#ifdef FAST_IPSEC
#include <netipsec/ipsec.h>
#include <netipsec/ipsec_var.h> /* XXX ipsecstat namespace */
#endif /* FAST_IPSEC*/
struct inpcbtable rawcbtable;
int rip_pcbnotify(struct inpcbtable *, struct in_addr,
struct in_addr, int, int, void (*)(struct inpcb *, int));
int rip_bind(struct inpcb *, struct mbuf *);
int rip_connect(struct inpcb *, struct mbuf *);
void rip_disconnect(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(void)
{
in_pcbinit(&rawcbtable, 1, 1);
}
/*
* Setup generic address and protocol structures
* for raw_input routine, then pass them along with
* mbuf chain.
*/
void
rip_input(struct mbuf *m, ...)
{
int proto;
struct ip *ip = mtod(m, struct ip *);
struct inpcb_hdr *inph;
struct inpcb *inp;
struct inpcb *last = 0;
struct mbuf *opts = 0;
struct sockaddr_in ripsrc;
va_list ap;
va_start(ap, m);
(void)va_arg(ap, int); /* ignore value, advance ap */
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((void *)ripsrc.sin_zero, sizeof(ripsrc.sin_zero));
/*
* XXX Compatibility: programs using raw IP expect ip_len
* XXX to have the header length subtracted, and in host order.
* XXX ip_off is also expected to be host order.
*/
ip->ip_len = ntohs(ip->ip_len) - (ip->ip_hl << 2);
NTOHS(ip->ip_off);
CIRCLEQ_FOREACH(inph, &rawcbtable.inpt_queue, inph_queue) {
inp = (struct inpcb *)inph;
if (inp->inp_af != AF_INET)
continue;
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;
#if defined(IPSEC) || defined(FAST_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;
}
#if defined(IPSEC) || defined(FAST_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;
}
int
rip_pcbnotify(struct inpcbtable *table,
struct in_addr faddr, struct in_addr laddr, int proto, int errno,
void (*notify)(struct inpcb *, int))
{
struct inpcb *inp, *ninp;
int nmatch;
nmatch = 0;
for (inp = (struct inpcb *)CIRCLEQ_FIRST(&table->inpt_queue);
inp != (struct inpcb *)&table->inpt_queue;
inp = ninp) {
ninp = (struct inpcb *)inp->inp_queue.cqe_next;
if (inp->inp_af != AF_INET)
continue;
if (inp->inp_ip.ip_p && inp->inp_ip.ip_p != proto)
continue;
if (in_hosteq(inp->inp_faddr, faddr) &&
in_hosteq(inp->inp_laddr, laddr)) {
(*notify)(inp, errno);
nmatch++;
}
}
return nmatch;
}
void *
rip_ctlinput(int cmd, const struct sockaddr *sa, void *v)
{
struct ip *ip = v;
void (*notify)(struct inpcb *, int) = in_rtchange;
int errno;
if (sa->sa_family != AF_INET ||
sa->sa_len != sizeof(struct sockaddr_in))
return NULL;
if ((unsigned)cmd >= PRC_NCMDS)
return NULL;
errno = inetctlerrmap[cmd];
if (PRC_IS_REDIRECT(cmd))
notify = in_rtchange, ip = 0;
else if (cmd == PRC_HOSTDEAD)
ip = 0;
else if (errno == 0)
return NULL;
if (ip) {
rip_pcbnotify(&rawcbtable, satocsin(sa)->sin_addr,
ip->ip_src, ip->ip_p, errno, notify);
/* XXX mapped address case */
} else
in_pcbnotifyall(&rawcbtable, satocsin(sa)->sin_addr, errno,
notify);
return NULL;
}
/*
* 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 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_DONTWAIT);
if (!m)
return (ENOBUFS);
ip = mtod(m, struct ip *);
ip->ip_tos = 0;
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 = 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 the mbuf is read-only, we need to allocate
* a new mbuf for the header, since we need to
* modify the header.
*/
if (M_READONLY(m)) {
int hlen = ip->ip_hl << 2;
m = m_copyup(m, hlen, (max_linkhdr + 3) & ~3);
if (m == NULL)
return (ENOMEM); /* XXX */
ip = mtod(m, struct ip *);
}
/* XXX userland passes ip_len and ip_off in host order */
if (m->m_pkthdr.len != ip->ip_len) {
m_freem(m);
return (EINVAL);
}
HTONS(ip->ip_len);
HTONS(ip->ip_off);
if (ip->ip_id == 0)
ip->ip_id = ip_newid();
opts = NULL;
/* XXX prevent ip_output from overwriting header fields */
flags |= IP_RAWOUTPUT;
ipstat.ips_rawout++;
}
return (ip_output(m, opts, &inp->inp_route, flags, inp->inp_moptions,
inp->inp_socket, &inp->inp_errormtu));
}
/*
* 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 = 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:
case MRT_API_CONFIG:
case MRT_ADD_BW_UPCALL:
case MRT_DEL_BW_UPCALL:
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, MT_SOOPTS);
MCLAIM((*m), so->so_mowner);
(*m)->m_len = sizeof (int);
*mtod(*m, int *) = inp->inp_flags & INP_HDRINCL ? 1 : 0;
break;
#ifdef MROUTING
case MRT_VERSION:
case MRT_ASSERT:
case MRT_API_SUPPORT:
case MRT_API_CONFIG:
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(struct inpcb *inp, struct mbuf *nam)
{
struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *);
if (nam->m_len != sizeof(*addr))
return (EINVAL);
if (TAILQ_FIRST(&ifnet) == 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(struct inpcb *inp, struct mbuf *nam)
{
struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *);
if (nam->m_len != sizeof(*addr))
return (EINVAL);
if (TAILQ_FIRST(&ifnet) == 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(struct inpcb *inp)
{
inp->inp_faddr = zeroin_addr;
}
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, struct lwp *l)
{
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, (void *)nam,
(struct ifnet *)control, l));
s = splsoftnet();
if (req == PRU_PURGEIF) {
in_pcbpurgeif0(&rawcbtable, (struct ifnet *)control);
in_purgeif((struct ifnet *)control);
in_pcbpurgeif(&rawcbtable, (struct ifnet *)control);
splx(s);
return (0);
}
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 (l == NULL) {
error = EACCES;
break;
}
/* XXX: raw socket permissions are checked in socreate() */
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);
}
SYSCTL_SETUP(sysctl_net_inet_raw_setup, "sysctl net.inet.raw subtree setup")
{
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_NODE, "net", NULL,
NULL, 0, NULL, 0,
CTL_NET, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_NODE, "inet", NULL,
NULL, 0, NULL, 0,
CTL_NET, PF_INET, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_NODE, "raw",
SYSCTL_DESCR("Raw IPv4 settings"),
NULL, 0, NULL, 0,
CTL_NET, PF_INET, IPPROTO_RAW, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_STRUCT, "pcblist",
SYSCTL_DESCR("Raw IPv4 control block list"),
sysctl_inpcblist, 0, &rawcbtable, 0,
CTL_NET, PF_INET, IPPROTO_RAW,
CTL_CREATE, CTL_EOL);
}
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