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NetBSD/sys/netinet6/ip6_output.c

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/* $NetBSD: ip6_output.c,v 1.68 2003/09/04 03:07:33 itojun Exp $ */
/* $KAME: ip6_output.c,v 1.172 2001/03/25 09:55:56 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, 1990, 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.
*
* @(#)ip_output.c 8.3 (Berkeley) 1/21/94
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ip6_output.c,v 1.68 2003/09/04 03:07:33 itojun Exp $");
#include "opt_inet.h"
#include "opt_ipsec.h"
#include "opt_pfil_hooks.h"
#include <sys/param.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/errno.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <net/if.h>
#include <net/route.h>
#ifdef PFIL_HOOKS
#include <net/pfil.h>
#endif
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/ip6.h>
#include <netinet/icmp6.h>
#include <netinet6/ip6_var.h>
#include <netinet6/in6_pcb.h>
#include <netinet6/nd6.h>
#ifdef IPSEC
#include <netinet6/ipsec.h>
#include <netkey/key.h>
#endif /* IPSEC */
#include "loop.h"
#include <net/net_osdep.h>
#ifdef PFIL_HOOKS
extern struct pfil_head inet6_pfil_hook; /* XXX */
#endif
struct ip6_exthdrs {
struct mbuf *ip6e_ip6;
struct mbuf *ip6e_hbh;
struct mbuf *ip6e_dest1;
struct mbuf *ip6e_rthdr;
struct mbuf *ip6e_dest2;
};
static int ip6_pcbopts __P((struct ip6_pktopts **, struct mbuf *,
struct socket *));
static int ip6_setmoptions __P((int, struct ip6_moptions **, struct mbuf *));
static int ip6_getmoptions __P((int, struct ip6_moptions *, struct mbuf **));
static int ip6_copyexthdr __P((struct mbuf **, caddr_t, int));
static int ip6_insertfraghdr __P((struct mbuf *, struct mbuf *, int,
struct ip6_frag **));
static int ip6_insert_jumboopt __P((struct ip6_exthdrs *, u_int32_t));
static int ip6_splithdr __P((struct mbuf *, struct ip6_exthdrs *));
static int ip6_getpmtu __P((struct route_in6 *, struct route_in6 *,
struct ifnet *, struct in6_addr *, u_long *));
extern struct ifnet loif[NLOOP];
/*
* IP6 output. The packet in mbuf chain m contains a skeletal IP6
* header (with pri, len, nxt, hlim, src, dst).
* This function may modify ver and hlim only.
* The mbuf chain containing the packet will be freed.
* The mbuf opt, if present, will not be freed.
*
* type of "mtu": rt_rmx.rmx_mtu is u_long, ifnet.ifr_mtu is int, and
* nd_ifinfo.linkmtu is u_int32_t. so we use u_long to hold largest one,
* which is rt_rmx.rmx_mtu.
*/
int
ip6_output(m0, opt, ro, flags, im6o, so, ifpp)
struct mbuf *m0;
struct ip6_pktopts *opt;
struct route_in6 *ro;
int flags;
struct ip6_moptions *im6o;
struct socket *so;
struct ifnet **ifpp; /* XXX: just for statistics */
{
struct ip6_hdr *ip6, *mhip6;
struct ifnet *ifp, *origifp;
struct mbuf *m = m0;
int hlen, tlen, len, off;
struct route_in6 ip6route;
struct sockaddr_in6 *dst;
int error = 0;
struct in6_ifaddr *ia;
u_long mtu;
u_int32_t optlen = 0, plen = 0, unfragpartlen = 0;
struct ip6_exthdrs exthdrs;
struct in6_addr finaldst;
struct route_in6 *ro_pmtu = NULL;
int hdrsplit = 0;
int needipsec = 0;
#ifdef IPSEC
int needipsectun = 0;
struct secpolicy *sp = NULL;
ip6 = mtod(m, struct ip6_hdr *);
#endif /* IPSEC */
#define MAKE_EXTHDR(hp, mp) \
do { \
if (hp) { \
struct ip6_ext *eh = (struct ip6_ext *)(hp); \
error = ip6_copyexthdr((mp), (caddr_t)(hp), \
((eh)->ip6e_len + 1) << 3); \
if (error) \
goto freehdrs; \
} \
} while (/*CONSTCOND*/ 0)
bzero(&exthdrs, sizeof(exthdrs));
if (opt) {
/* Hop-by-Hop options header */
MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh);
/* Destination options header(1st part) */
MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1);
/* Routing header */
MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr);
/* Destination options header(2nd part) */
MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2);
}
#ifdef IPSEC
/* get a security policy for this packet */
if (so == NULL)
sp = ipsec6_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, 0, &error);
else
sp = ipsec6_getpolicybysock(m, IPSEC_DIR_OUTBOUND, so, &error);
if (sp == NULL) {
ipsec6stat.out_inval++;
goto freehdrs;
}
error = 0;
/* check policy */
switch (sp->policy) {
case IPSEC_POLICY_DISCARD:
/*
* This packet is just discarded.
*/
ipsec6stat.out_polvio++;
goto freehdrs;
case IPSEC_POLICY_BYPASS:
case IPSEC_POLICY_NONE:
/* no need to do IPsec. */
needipsec = 0;
break;
case IPSEC_POLICY_IPSEC:
if (sp->req == NULL) {
/* XXX should be panic ? */
printf("ip6_output: No IPsec request specified.\n");
error = EINVAL;
goto freehdrs;
}
needipsec = 1;
break;
case IPSEC_POLICY_ENTRUST:
default:
printf("ip6_output: Invalid policy found. %d\n", sp->policy);
}
#endif /* IPSEC */
/*
* Calculate the total length of the extension header chain.
* Keep the length of the unfragmentable part for fragmentation.
*/
optlen = 0;
if (exthdrs.ip6e_hbh) optlen += exthdrs.ip6e_hbh->m_len;
if (exthdrs.ip6e_dest1) optlen += exthdrs.ip6e_dest1->m_len;
if (exthdrs.ip6e_rthdr) optlen += exthdrs.ip6e_rthdr->m_len;
unfragpartlen = optlen + sizeof(struct ip6_hdr);
/* NOTE: we don't add AH/ESP length here. do that later. */
if (exthdrs.ip6e_dest2) optlen += exthdrs.ip6e_dest2->m_len;
/*
* If we need IPsec, or there is at least one extension header,
* separate IP6 header from the payload.
*/
if ((needipsec || optlen) && !hdrsplit) {
if ((error = ip6_splithdr(m, &exthdrs)) != 0) {
m = NULL;
goto freehdrs;
}
m = exthdrs.ip6e_ip6;
hdrsplit++;
}
/* adjust pointer */
ip6 = mtod(m, struct ip6_hdr *);
/* adjust mbuf packet header length */
m->m_pkthdr.len += optlen;
plen = m->m_pkthdr.len - sizeof(*ip6);
/* If this is a jumbo payload, insert a jumbo payload option. */
if (plen > IPV6_MAXPACKET) {
if (!hdrsplit) {
if ((error = ip6_splithdr(m, &exthdrs)) != 0) {
m = NULL;
goto freehdrs;
}
m = exthdrs.ip6e_ip6;
hdrsplit++;
}
/* adjust pointer */
ip6 = mtod(m, struct ip6_hdr *);
if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0)
goto freehdrs;
ip6->ip6_plen = 0;
} else
ip6->ip6_plen = htons(plen);
/*
* Concatenate headers and fill in next header fields.
* Here we have, on "m"
* IPv6 payload
* and we insert headers accordingly. Finally, we should be getting:
* IPv6 hbh dest1 rthdr ah* [esp* dest2 payload]
*
* during the header composing process, "m" points to IPv6 header.
* "mprev" points to an extension header prior to esp.
*/
{
u_char *nexthdrp = &ip6->ip6_nxt;
struct mbuf *mprev = m;
/*
* we treat dest2 specially. this makes IPsec processing
* much easier.
*
* result: IPv6 dest2 payload
* m and mprev will point to IPv6 header.
*/
if (exthdrs.ip6e_dest2) {
if (!hdrsplit)
panic("assumption failed: hdr not split");
exthdrs.ip6e_dest2->m_next = m->m_next;
m->m_next = exthdrs.ip6e_dest2;
*mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt;
ip6->ip6_nxt = IPPROTO_DSTOPTS;
}
#define MAKE_CHAIN(m, mp, p, i)\
do {\
if (m) {\
if (!hdrsplit) \
panic("assumption failed: hdr not split"); \
*mtod((m), u_char *) = *(p);\
*(p) = (i);\
p = mtod((m), u_char *);\
(m)->m_next = (mp)->m_next;\
(mp)->m_next = (m);\
(mp) = (m);\
}\
} while (/*CONSTCOND*/ 0)
/*
* result: IPv6 hbh dest1 rthdr dest2 payload
* m will point to IPv6 header. mprev will point to the
* extension header prior to dest2 (rthdr in the above case).
*/
MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, nexthdrp, IPPROTO_HOPOPTS);
MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, nexthdrp,
IPPROTO_DSTOPTS);
MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, nexthdrp,
IPPROTO_ROUTING);
#ifdef IPSEC
if (!needipsec)
goto skip_ipsec2;
/*
* pointers after IPsec headers are not valid any more.
* other pointers need a great care too.
* (IPsec routines should not mangle mbufs prior to AH/ESP)
*/
exthdrs.ip6e_dest2 = NULL;
{
struct ip6_rthdr *rh = NULL;
int segleft_org = 0;
struct ipsec_output_state state;
if (exthdrs.ip6e_rthdr) {
rh = mtod(exthdrs.ip6e_rthdr, struct ip6_rthdr *);
segleft_org = rh->ip6r_segleft;
rh->ip6r_segleft = 0;
}
bzero(&state, sizeof(state));
state.m = m;
error = ipsec6_output_trans(&state, nexthdrp, mprev, sp, flags,
&needipsectun);
m = state.m;
if (error) {
/* mbuf is already reclaimed in ipsec6_output_trans. */
m = NULL;
switch (error) {
case EHOSTUNREACH:
case ENETUNREACH:
case EMSGSIZE:
case ENOBUFS:
case ENOMEM:
break;
default:
printf("ip6_output (ipsec): error code %d\n", error);
/* FALLTHROUGH */
case ENOENT:
/* don't show these error codes to the user */
error = 0;
break;
}
goto bad;
}
if (exthdrs.ip6e_rthdr) {
/* ah6_output doesn't modify mbuf chain */
rh->ip6r_segleft = segleft_org;
}
}
skip_ipsec2:;
#endif
}
/*
* If there is a routing header, replace destination address field
* with the first hop of the routing header.
*/
if (exthdrs.ip6e_rthdr) {
struct ip6_rthdr *rh;
struct ip6_rthdr0 *rh0;
struct in6_addr *addr;
rh = (struct ip6_rthdr *)(mtod(exthdrs.ip6e_rthdr,
struct ip6_rthdr *));
finaldst = ip6->ip6_dst;
switch (rh->ip6r_type) {
case IPV6_RTHDR_TYPE_0:
rh0 = (struct ip6_rthdr0 *)rh;
addr = (struct in6_addr *)(rh0 + 1);
ip6->ip6_dst = addr[0];
bcopy(&addr[1], &addr[0],
sizeof(struct in6_addr) * (rh0->ip6r0_segleft - 1));
addr[rh0->ip6r0_segleft - 1] = finaldst;
break;
default: /* is it possible? */
error = EINVAL;
goto bad;
}
}
/* Source address validation */
if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) &&
(flags & IPV6_UNSPECSRC) == 0) {
error = EOPNOTSUPP;
ip6stat.ip6s_badscope++;
goto bad;
}
if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) {
error = EOPNOTSUPP;
ip6stat.ip6s_badscope++;
goto bad;
}
ip6stat.ip6s_localout++;
/*
* Route packet.
*/
if (ro == 0) {
ro = &ip6route;
bzero((caddr_t)ro, sizeof(*ro));
}
ro_pmtu = ro;
if (opt && opt->ip6po_rthdr)
ro = &opt->ip6po_route;
dst = (struct sockaddr_in6 *)&ro->ro_dst;
/*
* If there is a cached route,
* check that it is to the same destination
* and is still up. If not, free it and try again.
*/
if (ro->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 ||
dst->sin6_family != AF_INET6 ||
!IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_dst))) {
RTFREE(ro->ro_rt);
ro->ro_rt = (struct rtentry *)0;
}
if (ro->ro_rt == 0) {
bzero(dst, sizeof(*dst));
dst->sin6_family = AF_INET6;
dst->sin6_len = sizeof(struct sockaddr_in6);
dst->sin6_addr = ip6->ip6_dst;
}
#ifdef IPSEC
if (needipsec && needipsectun) {
struct ipsec_output_state state;
/*
* All the extension headers will become inaccessible
* (since they can be encrypted).
* Don't panic, we need no more updates to extension headers
* on inner IPv6 packet (since they are now encapsulated).
*
* IPv6 [ESP|AH] IPv6 [extension headers] payload
*/
bzero(&exthdrs, sizeof(exthdrs));
exthdrs.ip6e_ip6 = m;
bzero(&state, sizeof(state));
state.m = m;
state.ro = (struct route *)ro;
state.dst = (struct sockaddr *)dst;
error = ipsec6_output_tunnel(&state, sp, flags);
m = state.m;
ro = (struct route_in6 *)state.ro;
dst = (struct sockaddr_in6 *)state.dst;
if (error) {
/* mbuf is already reclaimed in ipsec6_output_tunnel. */
m0 = m = NULL;
m = NULL;
switch (error) {
case EHOSTUNREACH:
case ENETUNREACH:
case EMSGSIZE:
case ENOBUFS:
case ENOMEM:
break;
default:
printf("ip6_output (ipsec): error code %d\n", error);
/* FALLTHROUGH */
case ENOENT:
/* don't show these error codes to the user */
error = 0;
break;
}
goto bad;
}
exthdrs.ip6e_ip6 = m;
}
#endif /* IPSEC */
if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
/* Unicast */
#define ifatoia6(ifa) ((struct in6_ifaddr *)(ifa))
#define sin6tosa(sin6) ((struct sockaddr *)(sin6))
/* xxx
* interface selection comes here
* if an interface is specified from an upper layer,
* ifp must point it.
*/
if (ro->ro_rt == 0) {
/*
* non-bsdi always clone routes, if parent is
* PRF_CLONING.
*/
rtalloc((struct route *)ro);
}
if (ro->ro_rt == 0) {
ip6stat.ip6s_noroute++;
error = EHOSTUNREACH;
/* XXX in6_ifstat_inc(ifp, ifs6_out_discard); */
goto bad;
}
ia = ifatoia6(ro->ro_rt->rt_ifa);
ifp = ro->ro_rt->rt_ifp;
ro->ro_rt->rt_use++;
if (ro->ro_rt->rt_flags & RTF_GATEWAY)
dst = (struct sockaddr_in6 *)ro->ro_rt->rt_gateway;
m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */
in6_ifstat_inc(ifp, ifs6_out_request);
/*
* Check if the outgoing interface conflicts with
* the interface specified by ifi6_ifindex (if specified).
* Note that loopback interface is always okay.
* (this may happen when we are sending a packet to one of
* our own addresses.)
*/
if (opt && opt->ip6po_pktinfo
&& opt->ip6po_pktinfo->ipi6_ifindex) {
if (!(ifp->if_flags & IFF_LOOPBACK)
&& ifp->if_index != opt->ip6po_pktinfo->ipi6_ifindex) {
ip6stat.ip6s_noroute++;
in6_ifstat_inc(ifp, ifs6_out_discard);
error = EHOSTUNREACH;
goto bad;
}
}
if (opt && opt->ip6po_hlim != -1)
ip6->ip6_hlim = opt->ip6po_hlim & 0xff;
} else {
/* Multicast */
struct in6_multi *in6m;
m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST;
/*
* See if the caller provided any multicast options
*/
ifp = NULL;
if (im6o != NULL) {
ip6->ip6_hlim = im6o->im6o_multicast_hlim;
if (im6o->im6o_multicast_ifp != NULL)
ifp = im6o->im6o_multicast_ifp;
} else
ip6->ip6_hlim = ip6_defmcasthlim;
/*
* See if the caller provided the outgoing interface
* as an ancillary data.
* Boundary check for ifindex is assumed to be already done.
*/
if (opt && opt->ip6po_pktinfo && opt->ip6po_pktinfo->ipi6_ifindex)
ifp = ifindex2ifnet[opt->ip6po_pktinfo->ipi6_ifindex];
/*
* If the destination is a node-local scope multicast,
* the packet should be loop-backed only.
*/
if (IN6_IS_ADDR_MC_NODELOCAL(&ip6->ip6_dst)) {
/*
* If the outgoing interface is already specified,
* it should be a loopback interface.
*/
if (ifp && (ifp->if_flags & IFF_LOOPBACK) == 0) {
ip6stat.ip6s_badscope++;
error = ENETUNREACH; /* XXX: better error? */
/* XXX correct ifp? */
in6_ifstat_inc(ifp, ifs6_out_discard);
goto bad;
} else {
ifp = &loif[0];
}
}
if (opt && opt->ip6po_hlim != -1)
ip6->ip6_hlim = opt->ip6po_hlim & 0xff;
/*
* If caller did not provide an interface lookup a
* default in the routing table. This is either a
* default for the speicfied group (i.e. a host
* route), or a multicast default (a route for the
* ``net'' ff00::/8).
*/
if (ifp == NULL) {
if (ro->ro_rt == 0) {
ro->ro_rt = rtalloc1((struct sockaddr *)
&ro->ro_dst, 0);
}
if (ro->ro_rt == 0) {
ip6stat.ip6s_noroute++;
error = EHOSTUNREACH;
/* XXX in6_ifstat_inc(ifp, ifs6_out_discard) */
goto bad;
}
ia = ifatoia6(ro->ro_rt->rt_ifa);
ifp = ro->ro_rt->rt_ifp;
ro->ro_rt->rt_use++;
}
if ((flags & IPV6_FORWARDING) == 0)
in6_ifstat_inc(ifp, ifs6_out_request);
in6_ifstat_inc(ifp, ifs6_out_mcast);
/*
* Confirm that the outgoing interface supports multicast.
*/
if ((ifp->if_flags & IFF_MULTICAST) == 0) {
ip6stat.ip6s_noroute++;
in6_ifstat_inc(ifp, ifs6_out_discard);
error = ENETUNREACH;
goto bad;
}
IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m);
if (in6m != NULL &&
(im6o == NULL || im6o->im6o_multicast_loop)) {
/*
* If we belong to the destination multicast group
* on the outgoing interface, and the caller did not
* forbid loopback, loop back a copy.
*/
ip6_mloopback(ifp, m, dst);
} else {
/*
* If we are acting as a multicast router, perform
* multicast forwarding as if the packet had just
* arrived on the interface to which we are about
* to send. The multicast forwarding function
* recursively calls this function, using the
* IPV6_FORWARDING flag to prevent infinite recursion.
*
* Multicasts that are looped back by ip6_mloopback(),
* above, will be forwarded by the ip6_input() routine,
* if necessary.
*/
if (ip6_mrouter && (flags & IPV6_FORWARDING) == 0) {
if (ip6_mforward(ip6, ifp, m) != 0) {
m_freem(m);
goto done;
}
}
}
/*
* Multicasts with a hoplimit of zero may be looped back,
* above, but must not be transmitted on a network.
* Also, multicasts addressed to the loopback interface
* are not sent -- the above call to ip6_mloopback() will
* loop back a copy if this host actually belongs to the
* destination group on the loopback interface.
*/
if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK)) {
m_freem(m);
goto done;
}
}
/*
* Fill the outgoing inteface to tell the upper layer
* to increment per-interface statistics.
*/
if (ifpp)
*ifpp = ifp;
/* Determine path MTU. */
if ((error = ip6_getpmtu(ro_pmtu, ro, ifp, &finaldst, &mtu)) != 0)
goto bad;
/*
* The caller of this function may specify to use the minimum MTU
* in some cases.
*/
if (mtu > IPV6_MMTU) {
if ((flags & IPV6_MINMTU))
mtu = IPV6_MMTU;
}
/* Fake scoped addresses */
if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
/*
* If source or destination address is a scoped address, and
* the packet is going to be sent to a loopback interface,
* we should keep the original interface.
*/
/*
* XXX: this is a very experimental and temporary solution.
* We eventually have sockaddr_in6 and use the sin6_scope_id
* field of the structure here.
* We rely on the consistency between two scope zone ids
* of source add destination, which should already be assured
* Larger scopes than link will be supported in the near
* future.
*/
origifp = NULL;
if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
origifp = ifindex2ifnet[ntohs(ip6->ip6_src.s6_addr16[1])];
else if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
origifp = ifindex2ifnet[ntohs(ip6->ip6_dst.s6_addr16[1])];
/*
* XXX: origifp can be NULL even in those two cases above.
* For example, if we remove the (only) link-local address
* from the loopback interface, and try to send a link-local
* address without link-id information. Then the source
* address is ::1, and the destination address is the
* link-local address with its s6_addr16[1] being zero.
* What is worse, if the packet goes to the loopback interface
* by a default rejected route, the null pointer would be
* passed to looutput, and the kernel would hang.
* The following last resort would prevent such disaster.
*/
if (origifp == NULL)
origifp = ifp;
} else
origifp = ifp;
if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
ip6->ip6_src.s6_addr16[1] = 0;
if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
ip6->ip6_dst.s6_addr16[1] = 0;
/*
* If the outgoing packet contains a hop-by-hop options header,
* it must be examined and processed even by the source node.
* (RFC 2460, section 4.)
*/
if (exthdrs.ip6e_hbh) {
struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *);
u_int32_t dummy1; /* XXX unused */
u_int32_t dummy2; /* XXX unused */
/*
* XXX: if we have to send an ICMPv6 error to the sender,
* we need the M_LOOP flag since icmp6_error() expects
* the IPv6 and the hop-by-hop options header are
* continuous unless the flag is set.
*/
m->m_flags |= M_LOOP;
m->m_pkthdr.rcvif = ifp;
if (ip6_process_hopopts(m, (u_int8_t *)(hbh + 1),
((hbh->ip6h_len + 1) << 3) - sizeof(struct ip6_hbh),
&dummy1, &dummy2) < 0) {
/* m was already freed at this point */
error = EINVAL;/* better error? */
goto done;
}
m->m_flags &= ~M_LOOP; /* XXX */
m->m_pkthdr.rcvif = NULL;
}
#ifdef PFIL_HOOKS
/*
* Run through list of hooks for output packets.
*/
if ((error = pfil_run_hooks(&inet6_pfil_hook, &m, ifp, PFIL_OUT)) != 0)
goto done;
if (m == NULL)
goto done;
ip6 = mtod(m, struct ip6_hdr *);
#endif /* PFIL_HOOKS */
/*
* Send the packet to the outgoing interface.
* If necessary, do IPv6 fragmentation before sending.
*/
tlen = m->m_pkthdr.len;
if (tlen <= mtu) {
#ifdef IFA_STATS
struct in6_ifaddr *ia6;
ip6 = mtod(m, struct ip6_hdr *);
ia6 = in6_ifawithifp(ifp, &ip6->ip6_src);
if (ia6) {
/* Record statistics for this interface address. */
ia6->ia_ifa.ifa_data.ifad_outbytes +=
m->m_pkthdr.len;
}
#endif
#ifdef IPSEC
/* clean ipsec history once it goes out of the node */
ipsec_delaux(m);
#endif
error = nd6_output(ifp, origifp, m, dst, ro->ro_rt);
goto done;
} else if (mtu < IPV6_MMTU) {
/*
* note that path MTU is never less than IPV6_MMTU
* (see icmp6_input).
*/
error = EMSGSIZE;
in6_ifstat_inc(ifp, ifs6_out_fragfail);
goto bad;
} else if (ip6->ip6_plen == 0) { /* jumbo payload cannot be fragmented */
error = EMSGSIZE;
in6_ifstat_inc(ifp, ifs6_out_fragfail);
goto bad;
} else {
struct mbuf **mnext, *m_frgpart;
struct ip6_frag *ip6f;
u_int32_t id = htonl(ip6_id++);
u_char nextproto;
/*
* Too large for the destination or interface;
* fragment if possible.
* Must be able to put at least 8 bytes per fragment.
*/
hlen = unfragpartlen;
if (mtu > IPV6_MAXPACKET)
mtu = IPV6_MAXPACKET;
len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7;
if (len < 8) {
error = EMSGSIZE;
in6_ifstat_inc(ifp, ifs6_out_fragfail);
goto bad;
}
mnext = &m->m_nextpkt;
/*
* Change the next header field of the last header in the
* unfragmentable part.
*/
if (exthdrs.ip6e_rthdr) {
nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *);
*mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT;
} else if (exthdrs.ip6e_dest1) {
nextproto = *mtod(exthdrs.ip6e_dest1, u_char *);
*mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT;
} else if (exthdrs.ip6e_hbh) {
nextproto = *mtod(exthdrs.ip6e_hbh, u_char *);
*mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT;
} else {
nextproto = ip6->ip6_nxt;
ip6->ip6_nxt = IPPROTO_FRAGMENT;
}
/*
* Loop through length of segment after first fragment,
* make new header and copy data of each part and link onto
* chain.
*/
m0 = m;
for (off = hlen; off < tlen; off += len) {
struct mbuf *mlast;
MGETHDR(m, M_DONTWAIT, MT_HEADER);
if (!m) {
error = ENOBUFS;
ip6stat.ip6s_odropped++;
goto sendorfree;
}
m->m_flags = m0->m_flags & M_COPYFLAGS;
*mnext = m;
mnext = &m->m_nextpkt;
m->m_data += max_linkhdr;
mhip6 = mtod(m, struct ip6_hdr *);
*mhip6 = *ip6;
m->m_len = sizeof(*mhip6);
error = ip6_insertfraghdr(m0, m, hlen, &ip6f);
if (error) {
ip6stat.ip6s_odropped++;
goto sendorfree;
}
ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7));
if (off + len >= tlen)
len = tlen - off;
else
ip6f->ip6f_offlg |= IP6F_MORE_FRAG;
mhip6->ip6_plen = htons((u_short)(len + hlen +
sizeof(*ip6f) - sizeof(struct ip6_hdr)));
if ((m_frgpart = m_copy(m0, off, len)) == 0) {
error = ENOBUFS;
ip6stat.ip6s_odropped++;
goto sendorfree;
}
for (mlast = m; mlast->m_next; mlast = mlast->m_next)
;
mlast->m_next = m_frgpart;
m->m_pkthdr.len = len + hlen + sizeof(*ip6f);
m->m_pkthdr.rcvif = (struct ifnet *)0;
ip6f->ip6f_reserved = 0;
ip6f->ip6f_ident = id;
ip6f->ip6f_nxt = nextproto;
ip6stat.ip6s_ofragments++;
in6_ifstat_inc(ifp, ifs6_out_fragcreat);
}
in6_ifstat_inc(ifp, ifs6_out_fragok);
}
/*
* Remove leading garbages.
*/
sendorfree:
m = m0->m_nextpkt;
m0->m_nextpkt = 0;
m_freem(m0);
for (m0 = m; m; m = m0) {
m0 = m->m_nextpkt;
m->m_nextpkt = 0;
if (error == 0) {
#ifdef IFA_STATS
struct in6_ifaddr *ia6;
ip6 = mtod(m, struct ip6_hdr *);
ia6 = in6_ifawithifp(ifp, &ip6->ip6_src);
if (ia6) {
/*
* Record statistics for this interface
* address.
*/
ia6->ia_ifa.ifa_data.ifad_outbytes +=
m->m_pkthdr.len;
}
#endif
#ifdef IPSEC
/* clean ipsec history once it goes out of the node */
ipsec_delaux(m);
#endif
error = nd6_output(ifp, origifp, m, dst, ro->ro_rt);
} else
m_freem(m);
}
if (error == 0)
ip6stat.ip6s_fragmented++;
done:
if (ro == &ip6route && ro->ro_rt) { /* brace necessary for RTFREE */
RTFREE(ro->ro_rt);
} else if (ro_pmtu == &ip6route && ro_pmtu->ro_rt) {
RTFREE(ro_pmtu->ro_rt);
}
#ifdef IPSEC
if (sp != NULL)
key_freesp(sp);
#endif /* IPSEC */
return (error);
freehdrs:
m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */
m_freem(exthdrs.ip6e_dest1);
m_freem(exthdrs.ip6e_rthdr);
m_freem(exthdrs.ip6e_dest2);
/* FALLTHROUGH */
bad:
m_freem(m);
goto done;
}
static int
ip6_copyexthdr(mp, hdr, hlen)
struct mbuf **mp;
caddr_t hdr;
int hlen;
{
struct mbuf *m;
if (hlen > MCLBYTES)
return (ENOBUFS); /* XXX */
MGET(m, M_DONTWAIT, MT_DATA);
if (!m)
return (ENOBUFS);
if (hlen > MLEN) {
MCLGET(m, M_DONTWAIT);
if ((m->m_flags & M_EXT) == 0) {
m_free(m);
return (ENOBUFS);
}
}
m->m_len = hlen;
if (hdr)
bcopy(hdr, mtod(m, caddr_t), hlen);
*mp = m;
return (0);
}
/*
* Insert jumbo payload option.
*/
static int
ip6_insert_jumboopt(exthdrs, plen)
struct ip6_exthdrs *exthdrs;
u_int32_t plen;
{
struct mbuf *mopt;
u_int8_t *optbuf;
u_int32_t v;
#define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */
/*
* If there is no hop-by-hop options header, allocate new one.
* If there is one but it doesn't have enough space to store the
* jumbo payload option, allocate a cluster to store the whole options.
* Otherwise, use it to store the options.
*/
if (exthdrs->ip6e_hbh == 0) {
MGET(mopt, M_DONTWAIT, MT_DATA);
if (mopt == 0)
return (ENOBUFS);
mopt->m_len = JUMBOOPTLEN;
optbuf = mtod(mopt, u_int8_t *);
optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */
exthdrs->ip6e_hbh = mopt;
} else {
struct ip6_hbh *hbh;
mopt = exthdrs->ip6e_hbh;
if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) {
/*
* XXX assumption:
* - exthdrs->ip6e_hbh is not referenced from places
* other than exthdrs.
* - exthdrs->ip6e_hbh is not an mbuf chain.
*/
int oldoptlen = mopt->m_len;
struct mbuf *n;
/*
* XXX: give up if the whole (new) hbh header does
* not fit even in an mbuf cluster.
*/
if (oldoptlen + JUMBOOPTLEN > MCLBYTES)
return (ENOBUFS);
/*
* As a consequence, we must always prepare a cluster
* at this point.
*/
MGET(n, M_DONTWAIT, MT_DATA);
if (n) {
MCLGET(n, M_DONTWAIT);
if ((n->m_flags & M_EXT) == 0) {
m_freem(n);
n = NULL;
}
}
if (!n)
return (ENOBUFS);
n->m_len = oldoptlen + JUMBOOPTLEN;
bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t),
oldoptlen);
optbuf = mtod(n, u_int8_t *) + oldoptlen;
m_freem(mopt);
mopt = exthdrs->ip6e_hbh = n;
} else {
optbuf = mtod(mopt, u_int8_t *) + mopt->m_len;
mopt->m_len += JUMBOOPTLEN;
}
optbuf[0] = IP6OPT_PADN;
optbuf[1] = 0;
/*
* Adjust the header length according to the pad and
* the jumbo payload option.
*/
hbh = mtod(mopt, struct ip6_hbh *);
hbh->ip6h_len += (JUMBOOPTLEN >> 3);
}
/* fill in the option. */
optbuf[2] = IP6OPT_JUMBO;
optbuf[3] = 4;
v = (u_int32_t)htonl(plen + JUMBOOPTLEN);
bcopy(&v, &optbuf[4], sizeof(u_int32_t));
/* finally, adjust the packet header length */
exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN;
return (0);
#undef JUMBOOPTLEN
}
/*
* Insert fragment header and copy unfragmentable header portions.
*/
static int
ip6_insertfraghdr(m0, m, hlen, frghdrp)
struct mbuf *m0, *m;
int hlen;
struct ip6_frag **frghdrp;
{
struct mbuf *n, *mlast;
if (hlen > sizeof(struct ip6_hdr)) {
n = m_copym(m0, sizeof(struct ip6_hdr),
hlen - sizeof(struct ip6_hdr), M_DONTWAIT);
if (n == 0)
return (ENOBUFS);
m->m_next = n;
} else
n = m;
/* Search for the last mbuf of unfragmentable part. */
for (mlast = n; mlast->m_next; mlast = mlast->m_next)
;
if ((mlast->m_flags & M_EXT) == 0 &&
M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) {
/* use the trailing space of the last mbuf for the fragment hdr */
*frghdrp = (struct ip6_frag *)(mtod(mlast, caddr_t) +
mlast->m_len);
mlast->m_len += sizeof(struct ip6_frag);
m->m_pkthdr.len += sizeof(struct ip6_frag);
} else {
/* allocate a new mbuf for the fragment header */
struct mbuf *mfrg;
MGET(mfrg, M_DONTWAIT, MT_DATA);
if (mfrg == 0)
return (ENOBUFS);
mfrg->m_len = sizeof(struct ip6_frag);
*frghdrp = mtod(mfrg, struct ip6_frag *);
mlast->m_next = mfrg;
}
return (0);
}
static int
ip6_getpmtu(ro_pmtu, ro, ifp, dst, mtup)
struct route_in6 *ro_pmtu, *ro;
struct ifnet *ifp;
struct in6_addr *dst;
u_long *mtup;
{
u_int32_t mtu = 0;
int error = 0;
if (ro_pmtu != ro) {
/* The first hop and the final destination may differ. */
struct sockaddr_in6 *sa6_dst =
(struct sockaddr_in6 *)&ro_pmtu->ro_dst;
if (ro_pmtu->ro_rt &&
((ro_pmtu->ro_rt->rt_flags & RTF_UP) == 0 ||
!IN6_ARE_ADDR_EQUAL(&sa6_dst->sin6_addr, dst))) {
RTFREE(ro_pmtu->ro_rt);
ro_pmtu->ro_rt = (struct rtentry *)0;
}
if (ro_pmtu->ro_rt == 0) {
bzero(sa6_dst, sizeof(*sa6_dst));
sa6_dst->sin6_family = AF_INET6;
sa6_dst->sin6_len = sizeof(struct sockaddr_in6);
sa6_dst->sin6_addr = *dst;
rtalloc((struct route *)ro_pmtu);
}
}
if (ro_pmtu->ro_rt) {
u_int32_t ifmtu;
if (ifp == NULL)
ifp = ro_pmtu->ro_rt->rt_ifp;
ifmtu = IN6_LINKMTU(ifp);
mtu = ro_pmtu->ro_rt->rt_rmx.rmx_mtu;
if (mtu == 0)
mtu = ifmtu;
else if (mtu > ifmtu) {
/*
* The MTU on the route is larger than the MTU on
* the interface! This shouldn't happen, unless the
* MTU of the interface has been changed after the
* interface was brought up. Change the MTU in the
* route to match the interface MTU (as long as the
* field isn't locked).
*
* if MTU on the route is 0, we need to fix the MTU.
* this case happens with path MTU discovery timeouts.
*/
mtu = ifmtu;
if (!(ro_pmtu->ro_rt->rt_rmx.rmx_locks & RTV_MTU))
ro_pmtu->ro_rt->rt_rmx.rmx_mtu = mtu;
}
} else if (ifp) {
mtu = IN6_LINKMTU(ifp);
} else
error = EHOSTUNREACH; /* XXX */
*mtup = mtu;
return (error);
}
/*
* IP6 socket option processing.
*/
int
ip6_ctloutput(op, so, level, optname, mp)
int op;
struct socket *so;
int level, optname;
struct mbuf **mp;
{
struct in6pcb *in6p = sotoin6pcb(so);
struct mbuf *m = *mp;
int optval = 0;
int error = 0;
struct proc *p = curproc; /* XXX */
if (level == IPPROTO_IPV6) {
switch (op) {
case PRCO_SETOPT:
switch (optname) {
case IPV6_PKTOPTIONS:
/* m is freed in ip6_pcbopts */
return (ip6_pcbopts(&in6p->in6p_outputopts,
m, so));
case IPV6_HOPOPTS:
case IPV6_DSTOPTS:
if (p == 0 || suser(p->p_ucred, &p->p_acflag)) {
error = EPERM;
break;
}
/* FALLTHROUGH */
case IPV6_UNICAST_HOPS:
case IPV6_RECVOPTS:
case IPV6_RECVRETOPTS:
case IPV6_RECVDSTADDR:
case IPV6_PKTINFO:
case IPV6_HOPLIMIT:
case IPV6_RTHDR:
case IPV6_FAITH:
case IPV6_V6ONLY:
if (!m || m->m_len != sizeof(int)) {
error = EINVAL;
break;
}
optval = *mtod(m, int *);
switch (optname) {
case IPV6_UNICAST_HOPS:
if (optval < -1 || optval >= 256)
error = EINVAL;
else {
/* -1 = kernel default */
in6p->in6p_hops = optval;
}
break;
#define OPTSET(bit) \
do { \
if (optval) \
in6p->in6p_flags |= (bit); \
else \
in6p->in6p_flags &= ~(bit); \
} while (/*CONSTCOND*/ 0)
case IPV6_RECVOPTS:
OPTSET(IN6P_RECVOPTS);
break;
case IPV6_RECVRETOPTS:
OPTSET(IN6P_RECVRETOPTS);
break;
case IPV6_RECVDSTADDR:
OPTSET(IN6P_RECVDSTADDR);
break;
case IPV6_PKTINFO:
OPTSET(IN6P_PKTINFO);
break;
case IPV6_HOPLIMIT:
OPTSET(IN6P_HOPLIMIT);
break;
case IPV6_HOPOPTS:
OPTSET(IN6P_HOPOPTS);
break;
case IPV6_DSTOPTS:
OPTSET(IN6P_DSTOPTS);
break;
case IPV6_RTHDR:
OPTSET(IN6P_RTHDR);
break;
case IPV6_FAITH:
OPTSET(IN6P_FAITH);
break;
case IPV6_V6ONLY:
/*
* make setsockopt(IPV6_V6ONLY)
* available only prior to bind(2).
* see ipng mailing list, Jun 22 2001.
*/
if (in6p->in6p_lport ||
!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
error = EINVAL;
break;
}
#ifdef INET6_BINDV6ONLY
if (!optval)
error = EINVAL;
#else
OPTSET(IN6P_IPV6_V6ONLY);
#endif
break;
}
break;
#undef OPTSET
case IPV6_MULTICAST_IF:
case IPV6_MULTICAST_HOPS:
case IPV6_MULTICAST_LOOP:
case IPV6_JOIN_GROUP:
case IPV6_LEAVE_GROUP:
error = ip6_setmoptions(optname,
&in6p->in6p_moptions, m);
break;
case IPV6_PORTRANGE:
optval = *mtod(m, int *);
switch (optval) {
case IPV6_PORTRANGE_DEFAULT:
in6p->in6p_flags &= ~(IN6P_LOWPORT);
in6p->in6p_flags &= ~(IN6P_HIGHPORT);
break;
case IPV6_PORTRANGE_HIGH:
in6p->in6p_flags &= ~(IN6P_LOWPORT);
in6p->in6p_flags |= IN6P_HIGHPORT;
break;
case IPV6_PORTRANGE_LOW:
in6p->in6p_flags &= ~(IN6P_HIGHPORT);
in6p->in6p_flags |= IN6P_LOWPORT;
break;
default:
error = EINVAL;
break;
}
break;
#ifdef IPSEC
case IPV6_IPSEC_POLICY:
{
caddr_t req = NULL;
size_t len = 0;
int priv = 0;
if (p == 0 || suser(p->p_ucred, &p->p_acflag))
priv = 0;
else
priv = 1;
if (m) {
req = mtod(m, caddr_t);
len = m->m_len;
}
error = ipsec6_set_policy(in6p,
optname, req, len, priv);
}
break;
#endif /* IPSEC */
default:
error = ENOPROTOOPT;
break;
}
if (m)
(void)m_free(m);
break;
case PRCO_GETOPT:
switch (optname) {
case IPV6_OPTIONS:
case IPV6_RETOPTS:
error = ENOPROTOOPT;
break;
case IPV6_PKTOPTIONS:
if (in6p->in6p_options) {
*mp = m_copym(in6p->in6p_options, 0,
M_COPYALL, M_WAIT);
} else {
*mp = m_get(M_WAIT, MT_SOOPTS);
(*mp)->m_len = 0;
}
break;
case IPV6_HOPOPTS:
case IPV6_DSTOPTS:
if (p == 0 || suser(p->p_ucred, &p->p_acflag)) {
error = EPERM;
break;
}
/* FALLTHROUGH */
case IPV6_UNICAST_HOPS:
case IPV6_RECVOPTS:
case IPV6_RECVRETOPTS:
case IPV6_RECVDSTADDR:
case IPV6_PORTRANGE:
case IPV6_PKTINFO:
case IPV6_HOPLIMIT:
case IPV6_RTHDR:
case IPV6_FAITH:
case IPV6_V6ONLY:
*mp = m = m_get(M_WAIT, MT_SOOPTS);
m->m_len = sizeof(int);
switch (optname) {
case IPV6_UNICAST_HOPS:
optval = in6p->in6p_hops;
break;
#define OPTBIT(bit) (in6p->in6p_flags & bit ? 1 : 0)
case IPV6_RECVOPTS:
optval = OPTBIT(IN6P_RECVOPTS);
break;
case IPV6_RECVRETOPTS:
optval = OPTBIT(IN6P_RECVRETOPTS);
break;
case IPV6_RECVDSTADDR:
optval = OPTBIT(IN6P_RECVDSTADDR);
break;
case IPV6_PORTRANGE:
{
int flags;
flags = in6p->in6p_flags;
if (flags & IN6P_HIGHPORT)
optval = IPV6_PORTRANGE_HIGH;
else if (flags & IN6P_LOWPORT)
optval = IPV6_PORTRANGE_LOW;
else
optval = 0;
break;
}
case IPV6_PKTINFO:
optval = OPTBIT(IN6P_PKTINFO);
break;
case IPV6_HOPLIMIT:
optval = OPTBIT(IN6P_HOPLIMIT);
break;
case IPV6_HOPOPTS:
optval = OPTBIT(IN6P_HOPOPTS);
break;
case IPV6_DSTOPTS:
optval = OPTBIT(IN6P_DSTOPTS);
break;
case IPV6_RTHDR:
optval = OPTBIT(IN6P_RTHDR);
break;
case IPV6_FAITH:
optval = OPTBIT(IN6P_FAITH);
break;
case IPV6_V6ONLY:
optval = OPTBIT(IN6P_IPV6_V6ONLY);
break;
}
*mtod(m, int *) = optval;
break;
case IPV6_MULTICAST_IF:
case IPV6_MULTICAST_HOPS:
case IPV6_MULTICAST_LOOP:
case IPV6_JOIN_GROUP:
case IPV6_LEAVE_GROUP:
error = ip6_getmoptions(optname, in6p->in6p_moptions, mp);
break;
#ifdef IPSEC
case IPV6_IPSEC_POLICY:
{
caddr_t req = NULL;
size_t len = 0;
if (m) {
req = mtod(m, caddr_t);
len = m->m_len;
}
error = ipsec6_get_policy(in6p, req, len, mp);
break;
}
#endif /* IPSEC */
default:
error = ENOPROTOOPT;
break;
}
break;
}
} else {
error = EINVAL;
if (op == PRCO_SETOPT && *mp)
(void)m_free(*mp);
}
return (error);
}
int
ip6_raw_ctloutput(op, so, level, optname, mp)
int op;
struct socket *so;
int level, optname;
struct mbuf **mp;
{
int error = 0, optval, optlen;
const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum);
struct in6pcb *in6p = sotoin6pcb(so);
struct mbuf *m = *mp;
optlen = m ? m->m_len : 0;
if (level != IPPROTO_IPV6) {
if (op == PRCO_SETOPT && *mp)
(void)m_free(*mp);
return (EINVAL);
}
switch (optname) {
case IPV6_CHECKSUM:
/*
* For ICMPv6 sockets, no modification allowed for checksum
* offset, permit "no change" values to help existing apps.
*
* XXX 2292bis says: "An attempt to set IPV6_CHECKSUM
* for an ICMPv6 socket will fail."
* The current behavior does not meet 2292bis.
*/
switch (op) {
case PRCO_SETOPT:
if (optlen != sizeof(int)) {
error = EINVAL;
break;
}
optval = *mtod(m, int *);
if ((optval % 2) != 0) {
/* the API assumes even offset values */
error = EINVAL;
} else if (so->so_proto->pr_protocol ==
IPPROTO_ICMPV6) {
if (optval != icmp6off)
error = EINVAL;
} else
in6p->in6p_cksum = optval;
break;
case PRCO_GETOPT:
if (so->so_proto->pr_protocol == IPPROTO_ICMPV6)
optval = icmp6off;
else
optval = in6p->in6p_cksum;
*mp = m = m_get(M_WAIT, MT_SOOPTS);
m->m_len = sizeof(int);
*mtod(m, int *) = optval;
break;
default:
error = EINVAL;
break;
}
break;
default:
error = ENOPROTOOPT;
break;
}
if (op == PRCO_SETOPT && m)
(void)m_free(m);
return (error);
}
/*
* Set up IP6 options in pcb for insertion in output packets.
* Store in mbuf with pointer in pcbopt, adding pseudo-option
* with destination address if source routed.
*/
static int
ip6_pcbopts(pktopt, m, so)
struct ip6_pktopts **pktopt;
struct mbuf *m;
struct socket *so;
{
struct ip6_pktopts *opt = *pktopt;
int error = 0;
struct proc *p = curproc; /* XXX */
int priv = 0;
/* turn off any old options. */
if (opt) {
if (opt->ip6po_m)
(void)m_free(opt->ip6po_m);
} else
opt = malloc(sizeof(*opt), M_IP6OPT, M_WAITOK);
*pktopt = 0;
if (!m || m->m_len == 0) {
/*
* Only turning off any previous options.
*/
free(opt, M_IP6OPT);
if (m)
(void)m_free(m);
return (0);
}
/* set options specified by user. */
if (p && !suser(p->p_ucred, &p->p_acflag))
priv = 1;
if ((error = ip6_setpktoptions(m, opt, priv)) != 0) {
(void)m_free(m);
free(opt, M_IP6OPT);
return (error);
}
*pktopt = opt;
return (0);
}
/*
* Set the IP6 multicast options in response to user setsockopt().
*/
static int
ip6_setmoptions(optname, im6op, m)
int optname;
struct ip6_moptions **im6op;
struct mbuf *m;
{
int error = 0;
u_int loop, ifindex;
struct ipv6_mreq *mreq;
struct ifnet *ifp;
struct ip6_moptions *im6o = *im6op;
struct route_in6 ro;
struct sockaddr_in6 *dst;
struct in6_multi_mship *imm;
struct proc *p = curproc; /* XXX */
if (im6o == NULL) {
/*
* No multicast option buffer attached to the pcb;
* allocate one and initialize to default values.
*/
im6o = (struct ip6_moptions *)
malloc(sizeof(*im6o), M_IPMOPTS, M_WAITOK);
if (im6o == NULL)
return (ENOBUFS);
*im6op = im6o;
im6o->im6o_multicast_ifp = NULL;
im6o->im6o_multicast_hlim = ip6_defmcasthlim;
im6o->im6o_multicast_loop = IPV6_DEFAULT_MULTICAST_LOOP;
LIST_INIT(&im6o->im6o_memberships);
}
switch (optname) {
case IPV6_MULTICAST_IF:
/*
* Select the interface for outgoing multicast packets.
*/
if (m == NULL || m->m_len != sizeof(u_int)) {
error = EINVAL;
break;
}
bcopy(mtod(m, u_int *), &ifindex, sizeof(ifindex));
if (ifindex < 0 || if_index < ifindex) {
error = ENXIO; /* XXX EINVAL? */
break;
}
ifp = ifindex2ifnet[ifindex];
if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) {
error = EADDRNOTAVAIL;
break;
}
im6o->im6o_multicast_ifp = ifp;
break;
case IPV6_MULTICAST_HOPS:
{
/*
* Set the IP6 hoplimit for outgoing multicast packets.
*/
int optval;
if (m == NULL || m->m_len != sizeof(int)) {
error = EINVAL;
break;
}
bcopy(mtod(m, u_int *), &optval, sizeof(optval));
if (optval < -1 || optval >= 256)
error = EINVAL;
else if (optval == -1)
im6o->im6o_multicast_hlim = ip6_defmcasthlim;
else
im6o->im6o_multicast_hlim = optval;
break;
}
case IPV6_MULTICAST_LOOP:
/*
* Set the loopback flag for outgoing multicast packets.
* Must be zero or one.
*/
if (m == NULL || m->m_len != sizeof(u_int)) {
error = EINVAL;
break;
}
bcopy(mtod(m, u_int *), &loop, sizeof(loop));
if (loop > 1) {
error = EINVAL;
break;
}
im6o->im6o_multicast_loop = loop;
break;
case IPV6_JOIN_GROUP:
/*
* Add a multicast group membership.
* Group must be a valid IP6 multicast address.
*/
if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) {
error = EINVAL;
break;
}
mreq = mtod(m, struct ipv6_mreq *);
if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) {
/*
* We use the unspecified address to specify to accept
* all multicast addresses. Only super user is allowed
* to do this.
*/
if (suser(p->p_ucred, &p->p_acflag))
{
error = EACCES;
break;
}
} else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) {
error = EINVAL;
break;
}
/*
* If the interface is specified, validate it.
*/
if (mreq->ipv6mr_interface < 0
|| if_index < mreq->ipv6mr_interface) {
error = ENXIO; /* XXX EINVAL? */
break;
}
/*
* If no interface was explicitly specified, choose an
* appropriate one according to the given multicast address.
*/
if (mreq->ipv6mr_interface == 0) {
/*
* If the multicast address is in node-local scope,
* the interface should be a loopback interface.
* Otherwise, look up the routing table for the
* address, and choose the outgoing interface.
* XXX: is it a good approach?
*/
if (IN6_IS_ADDR_MC_NODELOCAL(&mreq->ipv6mr_multiaddr)) {
ifp = &loif[0];
} else {
ro.ro_rt = NULL;
dst = (struct sockaddr_in6 *)&ro.ro_dst;
bzero(dst, sizeof(*dst));
dst->sin6_len = sizeof(struct sockaddr_in6);
dst->sin6_family = AF_INET6;
dst->sin6_addr = mreq->ipv6mr_multiaddr;
rtalloc((struct route *)&ro);
if (ro.ro_rt == NULL) {
error = EADDRNOTAVAIL;
break;
}
ifp = ro.ro_rt->rt_ifp;
rtfree(ro.ro_rt);
}
} else
ifp = ifindex2ifnet[mreq->ipv6mr_interface];
/*
* See if we found an interface, and confirm that it
* supports multicast
*/
if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) {
error = EADDRNOTAVAIL;
break;
}
/*
* Put interface index into the multicast address,
* if the address has link-local scope.
*/
if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) {
mreq->ipv6mr_multiaddr.s6_addr16[1] =
htons(mreq->ipv6mr_interface);
}
/*
* See if the membership already exists.
*/
for (imm = im6o->im6o_memberships.lh_first;
imm != NULL; imm = imm->i6mm_chain.le_next)
if (imm->i6mm_maddr->in6m_ifp == ifp &&
IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr,
&mreq->ipv6mr_multiaddr))
break;
if (imm != NULL) {
error = EADDRINUSE;
break;
}
/*
* Everything looks good; add a new record to the multicast
* address list for the given interface.
*/
imm = in6_joingroup(ifp, &mreq->ipv6mr_multiaddr, &error);
if (!imm)
break;
LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain);
break;
case IPV6_LEAVE_GROUP:
/*
* Drop a multicast group membership.
* Group must be a valid IP6 multicast address.
*/
if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) {
error = EINVAL;
break;
}
mreq = mtod(m, struct ipv6_mreq *);
if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) {
if (suser(p->p_ucred, &p->p_acflag))
{
error = EACCES;
break;
}
} else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) {
error = EINVAL;
break;
}
/*
* If an interface address was specified, get a pointer
* to its ifnet structure.
*/
if (mreq->ipv6mr_interface < 0
|| if_index < mreq->ipv6mr_interface) {
error = ENXIO; /* XXX EINVAL? */
break;
}
ifp = ifindex2ifnet[mreq->ipv6mr_interface];
/*
* Put interface index into the multicast address,
* if the address has link-local scope.
*/
if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) {
mreq->ipv6mr_multiaddr.s6_addr16[1] =
htons(mreq->ipv6mr_interface);
}
/*
* Find the membership in the membership list.
*/
for (imm = im6o->im6o_memberships.lh_first;
imm != NULL; imm = imm->i6mm_chain.le_next) {
if ((ifp == NULL || imm->i6mm_maddr->in6m_ifp == ifp) &&
IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr,
&mreq->ipv6mr_multiaddr))
break;
}
if (imm == NULL) {
/* Unable to resolve interface */
error = EADDRNOTAVAIL;
break;
}
/*
* Give up the multicast address record to which the
* membership points.
*/
LIST_REMOVE(imm, i6mm_chain);
in6_leavegroup(imm);
break;
default:
error = EOPNOTSUPP;
break;
}
/*
* If all options have default values, no need to keep the mbuf.
*/
if (im6o->im6o_multicast_ifp == NULL &&
im6o->im6o_multicast_hlim == ip6_defmcasthlim &&
im6o->im6o_multicast_loop == IPV6_DEFAULT_MULTICAST_LOOP &&
im6o->im6o_memberships.lh_first == NULL) {
free(*im6op, M_IPMOPTS);
*im6op = NULL;
}
return (error);
}
/*
* Return the IP6 multicast options in response to user getsockopt().
*/
static int
ip6_getmoptions(optname, im6o, mp)
int optname;
struct ip6_moptions *im6o;
struct mbuf **mp;
{
u_int *hlim, *loop, *ifindex;
*mp = m_get(M_WAIT, MT_SOOPTS);
switch (optname) {
case IPV6_MULTICAST_IF:
ifindex = mtod(*mp, u_int *);
(*mp)->m_len = sizeof(u_int);
if (im6o == NULL || im6o->im6o_multicast_ifp == NULL)
*ifindex = 0;
else
*ifindex = im6o->im6o_multicast_ifp->if_index;
return (0);
case IPV6_MULTICAST_HOPS:
hlim = mtod(*mp, u_int *);
(*mp)->m_len = sizeof(u_int);
if (im6o == NULL)
*hlim = ip6_defmcasthlim;
else
*hlim = im6o->im6o_multicast_hlim;
return (0);
case IPV6_MULTICAST_LOOP:
loop = mtod(*mp, u_int *);
(*mp)->m_len = sizeof(u_int);
if (im6o == NULL)
*loop = ip6_defmcasthlim;
else
*loop = im6o->im6o_multicast_loop;
return (0);
default:
return (EOPNOTSUPP);
}
}
/*
* Discard the IP6 multicast options.
*/
void
ip6_freemoptions(im6o)
struct ip6_moptions *im6o;
{
struct in6_multi_mship *imm;
if (im6o == NULL)
return;
while ((imm = im6o->im6o_memberships.lh_first) != NULL) {
LIST_REMOVE(imm, i6mm_chain);
in6_leavegroup(imm);
}
free(im6o, M_IPMOPTS);
}
/*
* Set IPv6 outgoing packet options based on advanced API.
*/
int
ip6_setpktoptions(control, opt, priv)
struct mbuf *control;
struct ip6_pktopts *opt;
int priv;
{
struct cmsghdr *cm = 0;
if (control == 0 || opt == 0)
return (EINVAL);
bzero(opt, sizeof(*opt));
opt->ip6po_hlim = -1; /* -1 means to use default hop limit */
/*
* XXX: Currently, we assume all the optional information is stored
* in a single mbuf.
*/
if (control->m_next)
return (EINVAL);
opt->ip6po_m = control;
for (; control->m_len; control->m_data += CMSG_ALIGN(cm->cmsg_len),
control->m_len -= CMSG_ALIGN(cm->cmsg_len)) {
cm = mtod(control, struct cmsghdr *);
if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len)
return (EINVAL);
if (cm->cmsg_level != IPPROTO_IPV6)
continue;
switch (cm->cmsg_type) {
case IPV6_PKTINFO:
if (cm->cmsg_len != CMSG_LEN(sizeof(struct in6_pktinfo)))
return (EINVAL);
opt->ip6po_pktinfo = (struct in6_pktinfo *)CMSG_DATA(cm);
if (opt->ip6po_pktinfo->ipi6_ifindex &&
IN6_IS_ADDR_LINKLOCAL(&opt->ip6po_pktinfo->ipi6_addr))
opt->ip6po_pktinfo->ipi6_addr.s6_addr16[1] =
htons(opt->ip6po_pktinfo->ipi6_ifindex);
if (opt->ip6po_pktinfo->ipi6_ifindex > if_index ||
opt->ip6po_pktinfo->ipi6_ifindex < 0) {
return (ENXIO);
}
/*
* Check if the requested source address is indeed a
* unicast address assigned to the node, and can be
* used as the packet's source address.
*/
if (!IN6_IS_ADDR_UNSPECIFIED(&opt->ip6po_pktinfo->ipi6_addr)) {
struct ifaddr *ia;
struct in6_ifaddr *ia6;
struct sockaddr_in6 sin6;
bzero(&sin6, sizeof(sin6));
sin6.sin6_len = sizeof(sin6);
sin6.sin6_family = AF_INET6;
sin6.sin6_addr =
opt->ip6po_pktinfo->ipi6_addr;
ia = ifa_ifwithaddr(sin6tosa(&sin6));
if (ia == NULL ||
(opt->ip6po_pktinfo->ipi6_ifindex &&
(ia->ifa_ifp->if_index !=
opt->ip6po_pktinfo->ipi6_ifindex))) {
return (EADDRNOTAVAIL);
}
ia6 = (struct in6_ifaddr *)ia;
if ((ia6->ia6_flags & (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) != 0) {
return (EADDRNOTAVAIL);
}
/*
* Check if the requested source address is
* indeed a unicast address assigned to the
* node.
*/
if (IN6_IS_ADDR_MULTICAST(&opt->ip6po_pktinfo->ipi6_addr))
return (EADDRNOTAVAIL);
}
break;
case IPV6_HOPLIMIT:
if (cm->cmsg_len != CMSG_LEN(sizeof(int)))
return (EINVAL);
else {
int t;
bcopy(CMSG_DATA(cm), &t, sizeof(t));
if (t < -1 || t > 255)
return (EINVAL);
opt->ip6po_hlim = t;
}
break;
case IPV6_NEXTHOP:
if (!priv)
return (EPERM);
/* check if cmsg_len is large enough for sa_len */
if (cm->cmsg_len < sizeof(u_char) ||
cm->cmsg_len < CMSG_LEN(*CMSG_DATA(cm)))
return (EINVAL);
opt->ip6po_nexthop = (struct sockaddr *)CMSG_DATA(cm);
break;
case IPV6_HOPOPTS:
if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_hbh)))
return (EINVAL);
else {
struct ip6_hbh *t;
t = (struct ip6_hbh *)CMSG_DATA(cm);
if (cm->cmsg_len !=
CMSG_LEN((t->ip6h_len + 1) << 3))
return (EINVAL);
opt->ip6po_hbh = t;
}
break;
case IPV6_DSTOPTS:
if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_dest)))
return (EINVAL);
/*
* If there is no routing header yet, the destination
* options header should be put on the 1st part.
* Otherwise, the header should be on the 2nd part.
* (See RFC 2460, section 4.1)
*/
if (opt->ip6po_rthdr == NULL) {
struct ip6_dest *t;
t = (struct ip6_dest *)CMSG_DATA(cm);
if (cm->cmsg_len !=
CMSG_LEN((t->ip6d_len + 1) << 3));
return (EINVAL);
opt->ip6po_dest1 = t;
}
else {
struct ip6_dest *t;
t = (struct ip6_dest *)CMSG_DATA(cm);
if (cm->cmsg_len !=
CMSG_LEN((opt->ip6po_dest2->ip6d_len + 1) << 3))
return (EINVAL);
opt->ip6po_dest2 = t;
}
break;
case IPV6_RTHDR:
if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_rthdr)))
return (EINVAL);
else {
struct ip6_rthdr *t;
t = (struct ip6_rthdr *)CMSG_DATA(cm);
if (cm->cmsg_len !=
CMSG_LEN((t->ip6r_len + 1) << 3))
return (EINVAL);
switch (t->ip6r_type) {
case IPV6_RTHDR_TYPE_0:
if (t->ip6r_segleft == 0)
return (EINVAL);
break;
default:
return (EINVAL);
}
opt->ip6po_rthdr = t;
}
break;
default:
return (ENOPROTOOPT);
}
}
return (0);
}
/*
* Routine called from ip6_output() to loop back a copy of an IP6 multicast
* packet to the input queue of a specified interface. Note that this
* calls the output routine of the loopback "driver", but with an interface
* pointer that might NOT be &loif -- easier than replicating that code here.
*/
void
ip6_mloopback(ifp, m, dst)
struct ifnet *ifp;
struct mbuf *m;
struct sockaddr_in6 *dst;
{
struct mbuf *copym;
struct ip6_hdr *ip6;
copym = m_copy(m, 0, M_COPYALL);
if (copym == NULL)
return;
/*
* Make sure to deep-copy IPv6 header portion in case the data
* is in an mbuf cluster, so that we can safely override the IPv6
* header portion later.
*/
if ((copym->m_flags & M_EXT) != 0 ||
copym->m_len < sizeof(struct ip6_hdr)) {
copym = m_pullup(copym, sizeof(struct ip6_hdr));
if (copym == NULL)
return;
}
#ifdef DIAGNOSTIC
if (copym->m_len < sizeof(*ip6)) {
m_freem(copym);
return;
}
#endif
ip6 = mtod(copym, struct ip6_hdr *);
if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
ip6->ip6_src.s6_addr16[1] = 0;
if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
ip6->ip6_dst.s6_addr16[1] = 0;
(void)looutput(ifp, copym, (struct sockaddr *)dst, NULL);
}
/*
* Chop IPv6 header off from the payload.
*/
static int
ip6_splithdr(m, exthdrs)
struct mbuf *m;
struct ip6_exthdrs *exthdrs;
{
struct mbuf *mh;
struct ip6_hdr *ip6;
ip6 = mtod(m, struct ip6_hdr *);
if (m->m_len > sizeof(*ip6)) {
MGETHDR(mh, M_DONTWAIT, MT_HEADER);
if (mh == 0) {
m_freem(m);
return ENOBUFS;
}
M_COPY_PKTHDR(mh, m);
MH_ALIGN(mh, sizeof(*ip6));
m->m_flags &= ~M_PKTHDR;
m->m_len -= sizeof(*ip6);
m->m_data += sizeof(*ip6);
mh->m_next = m;
m = mh;
m->m_len = sizeof(*ip6);
bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6));
}
exthdrs->ip6e_ip6 = m;
return 0;
}
/*
* Compute IPv6 extension header length.
*/
int
ip6_optlen(in6p)
struct in6pcb *in6p;
{
int len;
if (!in6p->in6p_outputopts)
return 0;
len = 0;
#define elen(x) \
(((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0)
len += elen(in6p->in6p_outputopts->ip6po_hbh);
len += elen(in6p->in6p_outputopts->ip6po_dest1);
len += elen(in6p->in6p_outputopts->ip6po_rthdr);
len += elen(in6p->in6p_outputopts->ip6po_dest2);
return len;
#undef elen
}
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