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NetBSD/sys/netinet6/raw_ip6.c

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/* $NetBSD: raw_ip6.c,v 1.13 1999/12/15 06:28:44 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 8.2 (Berkeley) 1/4/94
*/
#ifdef __NetBSD__ /*XXX*/
#include "opt_ipsec.h"
#endif
#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>
#ifdef __NetBSD__
#include <sys/proc.h>
#endif
#include <net/if.h>
#include <net/route.h>
#include <net/if_types.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet6/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet6/ip6_mroute.h>
#include <netinet6/icmp6.h>
#include <netinet6/in6_pcb.h>
#include <netinet6/nd6.h>
#ifdef IPSEC
#include <netinet6/ipsec.h>
#endif /*IPSEC*/
#include <machine/stdarg.h>
#include "faith.h"
struct in6pcb rawin6pcb;
#define ifatoia6(ifa) ((struct in6_ifaddr *)(ifa))
/*
* Raw interface to IP6 protocol.
*/
/*
* Initialize raw connection block queue.
*/
void
rip6_init()
{
rawin6pcb.in6p_next = rawin6pcb.in6p_prev = &rawin6pcb;
}
/*
* Setup generic address and protocol structures
* for raw_input routine, then pass them along with
* mbuf chain.
*/
int
rip6_input(mp, offp, proto)
struct mbuf **mp;
int *offp, proto;
{
struct mbuf *m = *mp;
register struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
register struct in6pcb *in6p;
struct in6pcb *last = NULL;
struct sockaddr_in6 rip6src;
struct mbuf *opts = NULL;
#if defined(NFAITH) && 0 < NFAITH
if (m->m_pkthdr.rcvif) {
if (m->m_pkthdr.rcvif->if_type == IFT_FAITH) {
/* send icmp6 host unreach? */
m_freem(m);
return IPPROTO_DONE;
}
}
#endif
bzero(&rip6src, sizeof(rip6src));
rip6src.sin6_len = sizeof(struct sockaddr_in6);
rip6src.sin6_family = AF_INET6;
rip6src.sin6_addr = ip6->ip6_src;
if (IN6_IS_SCOPE_LINKLOCAL(&rip6src.sin6_addr))
rip6src.sin6_addr.s6_addr16[1] = 0;
if (m->m_pkthdr.rcvif) {
if (IN6_IS_SCOPE_LINKLOCAL(&rip6src.sin6_addr))
rip6src.sin6_scope_id = m->m_pkthdr.rcvif->if_index;
else
rip6src.sin6_scope_id = 0;
} else
rip6src.sin6_scope_id = 0;
for (in6p = rawin6pcb.in6p_next;
in6p != &rawin6pcb; in6p = in6p->in6p_next) {
if (in6p->in6p_ip6.ip6_nxt &&
in6p->in6p_ip6.ip6_nxt != proto)
continue;
if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) &&
!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst))
continue;
if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) &&
!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src))
continue;
if (in6p->in6p_cksum != -1
&& in6_cksum(m, ip6->ip6_nxt, *offp, m->m_pkthdr.len - *offp))
{
/* XXX bark something */
continue;
}
if (last) {
struct mbuf *n;
if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
if (last->in6p_flags & IN6P_CONTROLOPTS)
ip6_savecontrol(last, &opts, ip6, n);
/* strip intermediate headers */
m_adj(n, *offp);
if (sbappendaddr(&last->in6p_socket->so_rcv,
(struct sockaddr *)&rip6src,
n, opts) == 0) {
/* should notify about lost packet */
m_freem(n);
if (opts)
m_freem(opts);
} else
sorwakeup(last->in6p_socket);
opts = NULL;
}
}
last = in6p;
}
if (last) {
if (last->in6p_flags & IN6P_CONTROLOPTS)
ip6_savecontrol(last, &opts, ip6, m);
/* strip intermediate headers */
m_adj(m, *offp);
if (sbappendaddr(&last->in6p_socket->so_rcv,
(struct sockaddr *)&rip6src, m, opts) == 0) {
m_freem(m);
if (opts)
m_freem(opts);
} else
sorwakeup(last->in6p_socket);
} else {
if (proto == IPPROTO_NONE)
m_freem(m);
else {
char *prvnxtp = ip6_get_prevhdr(m, *offp); /* XXX */
icmp6_error(m, ICMP6_PARAM_PROB,
ICMP6_PARAMPROB_NEXTHEADER,
prvnxtp - mtod(m, char *));
}
ip6stat.ip6s_delivered--;
}
return IPPROTO_DONE;
}
/*
* Generate IPv6 header and pass packet to ip6_output.
* Tack on options user may have setup with control call.
*/
int
#if __STDC__
rip6_output(struct mbuf *m, ...)
#else
rip6_output(m, va_alist)
struct mbuf *m;
va_dcl
#endif
{
struct socket *so;
struct sockaddr_in6 *dstsock;
struct mbuf *control;
struct in6_addr *dst;
struct ip6_hdr *ip6;
struct in6pcb *in6p;
u_int plen = m->m_pkthdr.len;
int error = 0;
struct ip6_pktopts opt, *optp = NULL;
struct ifnet *oifp = NULL;
int type, code; /* for ICMPv6 output statistics only */
int priv;
va_list ap;
va_start(ap, m);
so = va_arg(ap, struct socket *);
dstsock = va_arg(ap, struct sockaddr_in6 *);
control = va_arg(ap, struct mbuf *);
va_end(ap);
in6p = sotoin6pcb(so);
priv = 0;
{
struct proc *p = curproc; /* XXX */
if (p && !suser(p->p_ucred, &p->p_acflag))
priv = 1;
}
dst = &dstsock->sin6_addr;
if (control) {
if ((error = ip6_setpktoptions(control, &opt, priv)) != 0)
goto bad;
optp = &opt;
} else
optp = in6p->in6p_outputopts;
/*
* For an ICMPv6 packet, we should know its type and code
* to update statistics.
*/
if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
struct icmp6_hdr *icmp6;
if (m->m_len < sizeof(struct icmp6_hdr) &&
(m = m_pullup(m, sizeof(struct icmp6_hdr))) == NULL) {
error = ENOBUFS;
goto bad;
}
icmp6 = mtod(m, struct icmp6_hdr *);
type = icmp6->icmp6_type;
code = icmp6->icmp6_code;
}
M_PREPEND(m, sizeof(*ip6), M_WAIT);
ip6 = mtod(m, struct ip6_hdr *);
/*
* Next header might not be ICMP6 but use its pseudo header anyway.
*/
ip6->ip6_dst = *dst;
/*
* If the scope of the destination is link-local, embed the interface
* index in the address.
*
* XXX advanced-api value overrides sin6_scope_id
*/
if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst) ||
IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst)) {
struct in6_pktinfo *pi;
/*
* XXX Boundary check is assumed to be already done in
* ip6_setpktoptions().
*/
if (optp && (pi = optp->ip6po_pktinfo) && pi->ipi6_ifindex) {
ip6->ip6_dst.s6_addr16[1] = htons(pi->ipi6_ifindex);
oifp = ifindex2ifnet[pi->ipi6_ifindex];
}
else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
in6p->in6p_moptions &&
in6p->in6p_moptions->im6o_multicast_ifp) {
oifp = in6p->in6p_moptions->im6o_multicast_ifp;
ip6->ip6_dst.s6_addr16[1] = htons(oifp->if_index);
} else if (dstsock->sin6_scope_id) {
/* boundary check */
if (dstsock->sin6_scope_id < 0
|| if_index < dstsock->sin6_scope_id) {
error = ENXIO; /* XXX EINVAL? */
goto bad;
}
ip6->ip6_dst.s6_addr16[1]
= htons(dstsock->sin6_scope_id & 0xffff);/*XXX*/
}
}
/*
* Source address selection.
*/
{
struct in6_addr *in6a;
if ((in6a = in6_selectsrc(dstsock, optp,
in6p->in6p_moptions,
&in6p->in6p_route,
&in6p->in6p_laddr,
&error)) == 0) {
if (error == 0)
error = EADDRNOTAVAIL;
goto bad;
}
ip6->ip6_src = *in6a;
if (in6p->in6p_route.ro_rt)
oifp = ifindex2ifnet[in6p->in6p_route.ro_rt->rt_ifp->if_index];
}
ip6->ip6_flow = in6p->in6p_flowinfo & IPV6_FLOWINFO_MASK;
ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
ip6->ip6_vfc |= IPV6_VERSION;
#if 0 /* ip6_plen will be filled in ip6_output. */
ip6->ip6_plen = htons((u_short)plen);
#endif
ip6->ip6_nxt = in6p->in6p_ip6.ip6_nxt;
ip6->ip6_hlim = in6_selecthlim(in6p, oifp);
if (so->so_proto->pr_protocol == IPPROTO_ICMPV6 ||
in6p->in6p_cksum != -1) {
struct mbuf *n;
int off;
u_int16_t *p;
#define offsetof(type, member) ((size_t)(&((type *)0)->member)) /* XXX */
/* compute checksum */
if (so->so_proto->pr_protocol == IPPROTO_ICMPV6)
off = offsetof(struct icmp6_hdr, icmp6_cksum);
else
off = in6p->in6p_cksum;
if (plen < off + 1) {
error = EINVAL;
goto bad;
}
off += sizeof(struct ip6_hdr);
n = m;
while (n && n->m_len <= off) {
off -= n->m_len;
n = n->m_next;
}
if (!n)
goto bad;
p = (u_int16_t *)(mtod(n, caddr_t) + off);
*p = 0;
*p = in6_cksum(m, ip6->ip6_nxt, sizeof(*ip6), plen);
}
#ifdef IPSEC
m->m_pkthdr.rcvif = (struct ifnet *)so;
#endif /*IPSEC*/
error = ip6_output(m, optp, &in6p->in6p_route, 0, in6p->in6p_moptions,
&oifp);
if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
if (oifp)
icmp6_ifoutstat_inc(oifp, type, code);
icmp6stat.icp6s_outhist[type]++;
}
goto freectl;
bad:
if (m)
m_freem(m);
freectl:
if (optp == &opt && optp->ip6po_rthdr && optp->ip6po_route.ro_rt)
RTFREE(optp->ip6po_route.ro_rt);
if (control)
m_freem(control);
return(error);
}
/*
* Raw IPv6 socket option processing.
*/
int
rip6_ctloutput(op, so, level, optname, m)
int op;
struct socket *so;
int level, optname;
struct mbuf **m;
{
int error = 0;
switch(level) {
case IPPROTO_IPV6:
switch(optname) {
case MRT6_INIT:
case MRT6_DONE:
case MRT6_ADD_MIF:
case MRT6_DEL_MIF:
case MRT6_ADD_MFC:
case MRT6_DEL_MFC:
case MRT6_PIM:
if (op == PRCO_SETOPT) {
error = ip6_mrouter_set(optname, so, *m);
if (*m)
(void)m_free(*m);
} else if (op == PRCO_GETOPT) {
error = ip6_mrouter_get(optname, so, m);
} else
error = EINVAL;
return (error);
}
return (ip6_ctloutput(op, so, level, optname, m));
/* NOTREACHED */
case IPPROTO_ICMPV6:
/*
* XXX: is it better to call icmp6_ctloutput() directly
* from protosw?
*/
return(icmp6_ctloutput(op, so, level, optname, m));
default:
if (op == PRCO_SETOPT && *m)
(void)m_free(*m);
return(EINVAL);
}
}
extern u_long rip6_sendspace;
extern u_long rip6_recvspace;
int
rip6_usrreq(so, req, m, nam, control, p)
register struct socket *so;
int req;
struct mbuf *m, *nam, *control;
struct proc *p;
{
register struct in6pcb *in6p = sotoin6pcb(so);
int s;
int error = 0;
/* extern struct socket *ip6_mrouter; */ /* xxx */
int priv;
priv = 0;
if (p && !suser(p->p_ucred, &p->p_acflag))
priv++;
if (req == PRU_CONTROL)
return (in6_control(so, (u_long)m, (caddr_t)nam,
(struct ifnet *)control, p));
switch (req) {
case PRU_ATTACH:
if (in6p)
panic("rip6_attach");
if (!priv) {
error = EACCES;
break;
}
s = splsoftnet();
if ((error = soreserve(so, rip6_sendspace, rip6_recvspace)) ||
(error = in6_pcballoc(so, &rawin6pcb))) {
splx(s);
break;
}
splx(s);
in6p = sotoin6pcb(so);
in6p->in6p_ip6.ip6_nxt = (long)nam;
in6p->in6p_cksum = -1;
#ifdef IPSEC
error = ipsec_init_policy(&in6p->in6p_sp);
if (error != 0) {
in6_pcbdetach(in6p);
break;
}
#endif /*IPSEC*/
MALLOC(in6p->in6p_icmp6filt, struct icmp6_filter *,
sizeof(struct icmp6_filter), M_PCB, M_NOWAIT);
if (in6p->in6p_icmp6filt == NULL) {
in6_pcbdetach(in6p);
error = ENOMEM;
break;
}
ICMP6_FILTER_SETPASSALL(in6p->in6p_icmp6filt);
break;
case PRU_DISCONNECT:
if ((so->so_state & SS_ISCONNECTED) == 0) {
error = ENOTCONN;
break;
}
in6p->in6p_faddr = in6addr_any;
so->so_state &= ~SS_ISCONNECTED; /* XXX */
break;
case PRU_ABORT:
soisdisconnected(so);
/* Fallthrough */
case PRU_DETACH:
if (in6p == 0)
panic("rip6_detach");
if (so == ip6_mrouter)
ip6_mrouter_done();
/* xxx: RSVP */
if (in6p->in6p_icmp6filt) {
FREE(in6p->in6p_icmp6filt, M_PCB);
in6p->in6p_icmp6filt = NULL;
}
in6_pcbdetach(in6p);
break;
case PRU_BIND:
{
struct sockaddr_in6 *addr = mtod(nam, struct sockaddr_in6 *);
struct ifaddr *ia = NULL;
if (nam->m_len != sizeof(*addr)) {
error = EINVAL;
break;
}
if ((ifnet.tqh_first == 0) ||
(addr->sin6_family != AF_INET6) ||
(!IN6_IS_ADDR_UNSPECIFIED(&addr->sin6_addr) &&
(ia = ifa_ifwithaddr((struct sockaddr *)addr)) == 0)) {
error = EADDRNOTAVAIL;
break;
}
if (ia &&
((struct in6_ifaddr *)ia)->ia6_flags &
(IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|
IN6_IFF_DETACHED|IN6_IFF_DEPRECATED)) {
error = EADDRNOTAVAIL;
break;
}
in6p->in6p_laddr = addr->sin6_addr;
break;
}
case PRU_CONNECT:
{
struct sockaddr_in6 *addr = mtod(nam, struct sockaddr_in6 *);
struct in6_addr *in6a = NULL;
if (nam->m_len != sizeof(*addr)) {
error = EINVAL;
break;
}
if (ifnet.tqh_first == 0) {
error = EADDRNOTAVAIL;
break;
}
if (addr->sin6_family != AF_INET6) {
error = EAFNOSUPPORT;
break;
}
/* Source address selection. XXX: need pcblookup? */
in6a = in6_selectsrc(addr, in6p->in6p_outputopts,
in6p->in6p_moptions,
&in6p->in6p_route,
&in6p->in6p_laddr,
&error);
if (in6a == NULL) {
if (error == 0)
error = EADDRNOTAVAIL;
break;
}
in6p->in6p_laddr = *in6a;
in6p->in6p_faddr = addr->sin6_addr;
soisconnected(so);
break;
}
case PRU_CONNECT2:
error = EOPNOTSUPP;
break;
/*
* Mark the connection as being incapable of futther input.
*/
case PRU_SHUTDOWN:
socantsendmore(so);
break;
/*
* Ship a packet out. The appropriate raw output
* routine handles any messaging necessary.
*/
case PRU_SEND:
{
struct sockaddr_in6 tmp;
struct sockaddr_in6 *dst;
if (so->so_state & SS_ISCONNECTED) {
if (nam) {
error = EISCONN;
break;
}
/* XXX */
bzero(&tmp, sizeof(tmp));
tmp.sin6_family = AF_INET6;
tmp.sin6_len = sizeof(struct sockaddr_in6);
bcopy(&in6p->in6p_faddr, &tmp.sin6_addr,
sizeof(struct in6_addr));
dst = &tmp;
} else {
if (nam == NULL) {
error = ENOTCONN;
break;
}
dst = mtod(nam, struct sockaddr_in6 *);
}
error = rip6_output(m, so, dst, control);
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:
in6_setsockaddr(in6p, nam);
break;
case PRU_PEERADDR:
in6_setpeeraddr(in6p, nam);
break;
default:
panic("rip6_usrreq");
}
if (m != NULL)
m_freem(m);
return(error);
}
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