File: [local] / sys / netinet6 / ip6_output.c (download)
Revision 1.1.1.1 (vendor branch), Tue Mar 4 16:15:54 2008 UTC (16 years, 6 months ago) by nbrk
Branch: OPENBSD_4_2_BASE, MAIN
CVS Tags: jornada-partial-support-wip, HEAD Changes since 1.1: +0 -0 lines
Import of OpenBSD 4.2 release kernel tree with initial code to support
Jornada 720/728, StrongARM 1110-based handheld PC.
At this point kernel roots on NFS and boots into vfs_mountroot() and traps.
What is supported:
- glass console, Jornada framebuffer (jfb) works in 16bpp direct color mode
(needs some palette tweaks for non black/white/blue colors, i think)
- saic, SA11x0 interrupt controller (needs cleanup)
- sacom, SA11x0 UART (supported only as boot console for now)
- SA11x0 GPIO controller fully supported (but can't handle multiple interrupt
handlers on one gpio pin)
- sassp, SSP port on SA11x0 that attaches spibus
- Jornada microcontroller (jmcu) to control kbd, battery, etc throught
the SPI bus (wskbd attaches on jmcu, but not tested)
- tod functions seem work
- initial code for SA-1111 (chip companion) : this is TODO
Next important steps, i think:
- gpio and intc on sa1111
- pcmcia support for sa11x0 (and sa1111 help logic)
- REAL root on nfs when we have PCMCIA support (we may use any of supported pccard NICs)
- root on wd0! (using already supported PCMCIA-ATA)
|
/* $OpenBSD: ip6_output.c,v 1.99 2007/06/01 00:52:38 henning 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 "pf.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>
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/in_pcb.h>
#include <netinet/ip6.h>
#include <netinet/icmp6.h>
#include <netinet6/ip6_var.h>
#include <netinet6/nd6.h>
#include <netinet6/ip6protosw.h>
#if NPF > 0
#include <net/pfvar.h>
#endif
#ifdef IPSEC
#include <netinet/ip_ipsp.h>
#include <netinet/ip_ah.h>
#include <netinet/ip_esp.h>
#include <netinet/udp.h>
#include <netinet/tcp.h>
#include <net/pfkeyv2.h>
extern u_int8_t get_sa_require(struct inpcb *);
extern int ipsec_auth_default_level;
extern int ipsec_esp_trans_default_level;
extern int ipsec_esp_network_default_level;
extern int ipsec_ipcomp_default_level;
#endif /* IPSEC */
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_pcbopt(int, u_char *, int, struct ip6_pktopts **, int, int);
static int ip6_pcbopts(struct ip6_pktopts **, struct mbuf *, struct socket *);
static int ip6_getpcbopt(struct ip6_pktopts *, int, struct mbuf **);
static int ip6_setpktopt(int, u_char *, int, struct ip6_pktopts *, int, int,
int, int);
static int ip6_setmoptions(int, struct ip6_moptions **, struct mbuf *);
static int ip6_getmoptions(int, struct ip6_moptions *, struct mbuf **);
static int ip6_copyexthdr(struct mbuf **, caddr_t, int);
static int ip6_insertfraghdr(struct mbuf *, struct mbuf *, int,
struct ip6_frag **);
static int ip6_insert_jumboopt(struct ip6_exthdrs *, u_int32_t);
static int ip6_splithdr(struct mbuf *, struct ip6_exthdrs *);
static int ip6_getpmtu(struct route_in6 *, struct route_in6 *,
struct ifnet *, struct in6_addr *, u_long *, int *);
static int copypktopts(struct ip6_pktopts *, struct ip6_pktopts *, int);
/*
* 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, ifpp, inp)
struct mbuf *m0;
struct ip6_pktopts *opt;
struct route_in6 *ro;
int flags;
struct ip6_moptions *im6o;
struct ifnet **ifpp; /* XXX: just for statistics */
struct inpcb *inp;
{
struct ip6_hdr *ip6, *mhip6;
struct ifnet *ifp, *origifp = NULL;
struct mbuf *m = m0;
int hlen, tlen, len, off;
struct route_in6 ip6route;
struct rtentry *rt = NULL;
struct sockaddr_in6 *dst, dstsock;
int error = 0;
struct in6_ifaddr *ia = NULL;
u_long mtu;
int alwaysfrag, dontfrag;
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;
u_int8_t sproto = 0;
#ifdef IPSEC
struct m_tag *mtag;
union sockaddr_union sdst;
struct tdb_ident *tdbi;
u_int32_t sspi;
struct tdb *tdb;
int s;
#endif /* IPSEC */
#ifdef IPSEC
if (inp && (inp->inp_flags & INP_IPV6) == 0)
panic("ip6_output: IPv4 pcb is passed");
#endif /* IPSEC */
ip6 = mtod(m, struct ip6_hdr *);
finaldst = ip6->ip6_dst;
#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 (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
if (!ipsec_in_use && !inp)
goto done_spd;
/*
* splnet is chosen over spltdb because we are not allowed to
* lower the level, and udp6_output calls us in splnet(). XXX check
*/
s = splnet();
/*
* Check if there was an outgoing SA bound to the flow
* from a transport protocol.
*/
ip6 = mtod(m, struct ip6_hdr *);
/* Do we have any pending SAs to apply ? */
mtag = m_tag_find(m, PACKET_TAG_IPSEC_PENDING_TDB, NULL);
if (mtag != NULL) {
#ifdef DIAGNOSTIC
if (mtag->m_tag_len != sizeof (struct tdb_ident))
panic("ip6_output: tag of length %d (should be %d",
mtag->m_tag_len, sizeof (struct tdb_ident));
#endif
tdbi = (struct tdb_ident *)(mtag + 1);
tdb = gettdb(tdbi->spi, &tdbi->dst, tdbi->proto);
if (tdb == NULL)
error = -EINVAL;
m_tag_delete(m, mtag);
} else
tdb = ipsp_spd_lookup(m, AF_INET6, sizeof(struct ip6_hdr),
&error, IPSP_DIRECTION_OUT, NULL, inp);
if (tdb == NULL) {
splx(s);
if (error == 0) {
/*
* No IPsec processing required, we'll just send the
* packet out.
*/
sproto = 0;
/* Fall through to routing/multicast handling */
} else {
/*
* -EINVAL is used to indicate that the packet should
* be silently dropped, typically because we've asked
* key management for an SA.
*/
if (error == -EINVAL) /* Should silently drop packet */
error = 0;
goto freehdrs;
}
} else {
/* Loop detection */
for (mtag = m_tag_first(m); mtag != NULL;
mtag = m_tag_next(m, mtag)) {
if (mtag->m_tag_id != PACKET_TAG_IPSEC_OUT_DONE &&
mtag->m_tag_id !=
PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED)
continue;
tdbi = (struct tdb_ident *)(mtag + 1);
if (tdbi->spi == tdb->tdb_spi &&
tdbi->proto == tdb->tdb_sproto &&
!bcmp(&tdbi->dst, &tdb->tdb_dst,
sizeof(union sockaddr_union))) {
splx(s);
sproto = 0; /* mark as no-IPsec-needed */
goto done_spd;
}
}
/* We need to do IPsec */
bcopy(&tdb->tdb_dst, &sdst, sizeof(sdst));
sspi = tdb->tdb_spi;
sproto = tdb->tdb_sproto;
splx(s);
}
/* Fall through to the routing/multicast handling code */
done_spd:
#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 ((sproto || 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. the goal here is to make mprev point the
* mbuf prior to dest2.
*
* 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 (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);
}
/*
* If there is a routing header, replace the 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 *));
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 (!(flags & IPV6_UNSPECSRC) &&
IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) {
/*
* XXX: we can probably assume validation in the caller, but
* we explicitly check the address here for safety.
*/
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.
*/
/* initialize cached route */
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 specified, try to fill in the traffic class field.
* do not override if a non-zero value is already set.
* we check the diffserv field and the ecn field separately.
*/
if (opt && opt->ip6po_tclass >= 0) {
int mask = 0;
if ((ip6->ip6_flow & htonl(0xfc << 20)) == 0)
mask |= 0xfc;
if ((ip6->ip6_flow & htonl(0x03 << 20)) == 0)
mask |= 0x03;
if (mask != 0)
ip6->ip6_flow |= htonl((opt->ip6po_tclass & mask) << 20);
}
/* fill in or override the hop limit field, if necessary. */
if (opt && opt->ip6po_hlim != -1)
ip6->ip6_hlim = opt->ip6po_hlim & 0xff;
else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
if (im6o != NULL)
ip6->ip6_hlim = im6o->im6o_multicast_hlim;
else
ip6->ip6_hlim = ip6_defmcasthlim;
}
#ifdef IPSEC
/*
* Check if the packet needs encapsulation.
* ipsp_process_packet will never come back to here.
*/
if (sproto != 0) {
s = splnet();
/*
* XXX what should we do if ip6_hlim == 0 and the
* packet gets tunneled?
*/
tdb = gettdb(sspi, &sdst, sproto);
if (tdb == NULL) {
splx(s);
error = EHOSTUNREACH;
m_freem(m);
goto done;
}
/* Latch to PCB */
if (inp)
tdb_add_inp(tdb, inp, 0);
m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */
/* Callee frees mbuf */
/*
* if we are source-routing, do not attempt to tunnel the
* packet just because ip6_dst is different from what tdb has.
* XXX
*/
error = ipsp_process_packet(m, tdb, AF_INET6,
exthdrs.ip6e_rthdr ? 1 : 0);
splx(s);
return error; /* Nothing more to be done */
}
#endif /* IPSEC */
bzero(&dstsock, sizeof(dstsock));
dstsock.sin6_family = AF_INET6;
dstsock.sin6_addr = ip6->ip6_dst;
dstsock.sin6_len = sizeof(dstsock);
if ((error = in6_selectroute(&dstsock, opt, im6o, ro, &ifp,
&rt)) != 0) {
switch (error) {
case EHOSTUNREACH:
ip6stat.ip6s_noroute++;
break;
case EADDRNOTAVAIL:
default:
break; /* XXX statistics? */
}
if (ifp != NULL)
in6_ifstat_inc(ifp, ifs6_out_discard);
goto bad;
}
if (rt == NULL) {
/*
* If in6_selectroute() does not return a route entry,
* dst may not have been updated.
*/
*dst = dstsock; /* XXX */
}
/*
* then rt (for unicast) and ifp must be non-NULL valid values.
*/
if (rt) {
ia = (struct in6_ifaddr *)(rt->rt_ifa);
rt->rt_use++;
}
if ((flags & IPV6_FORWARDING) == 0) {
/* XXX: the FORWARDING flag can be set for mrouting. */
in6_ifstat_inc(ifp, ifs6_out_request);
}
/*
* The outgoing interface must be in the zone of source and
* destination addresses. We should use ia_ifp to support the
* case of sending packets to an address of our own.
*/
if (ia != NULL && ia->ia_ifp)
origifp = ia->ia_ifp;
else
origifp = ifp;
if (rt && !IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
if (opt && opt->ip6po_nextroute.ro_rt) {
/*
* The nexthop is explicitly specified by the
* application. We assume the next hop is an IPv6
* address.
*/
dst = (struct sockaddr_in6 *)opt->ip6po_nexthop;
} else if ((rt->rt_flags & RTF_GATEWAY))
dst = (struct sockaddr_in6 *)rt->rt_gateway;
}
if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
/* Unicast */
m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */
} else {
/* Multicast */
struct in6_multi *in6m;
m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST;
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.
*/
#ifdef MROUTING
if (ip6_mforwarding && ip6_mrouter &&
(flags & IPV6_FORWARDING) == 0) {
if (ip6_mforward(ip6, ifp, m) != 0) {
m_freem(m);
goto done;
}
}
#endif
}
/*
* 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) ||
IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst)) {
m_freem(m);
goto done;
}
}
/*
* Fill the outgoing interface 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,
&alwaysfrag)) != 0)
goto bad;
/*
* The caller of this function may specify to use the minimum MTU
* in some cases.
* An advanced API option (IPV6_USE_MIN_MTU) can also override MTU
* setting. The logic is a bit complicated; by default, unicast
* packets will follow path MTU while multicast packets will be sent at
* the minimum MTU. If IP6PO_MINMTU_ALL is specified, all packets
* including unicast ones will be sent at the minimum MTU. Multicast
* packets will always be sent at the minimum MTU unless
* IP6PO_MINMTU_DISABLE is explicitly specified.
* See RFC 3542 for more details.
*/
if (mtu > IPV6_MMTU) {
if ((flags & IPV6_MINMTU))
mtu = IPV6_MMTU;
else if (opt && opt->ip6po_minmtu == IP6PO_MINMTU_ALL)
mtu = IPV6_MMTU;
else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
(opt == NULL ||
opt->ip6po_minmtu != IP6PO_MINMTU_DISABLE)) {
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_EMBED(&ip6->ip6_src))
origifp = ifindex2ifnet[ntohs(ip6->ip6_src.s6_addr16[1])];
else if (IN6_IS_SCOPE_EMBED(&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_EMBED(&ip6->ip6_src))
ip6->ip6_src.s6_addr16[1] = 0;
if (IN6_IS_SCOPE_EMBED(&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;
}
#if NPF > 0
if (pf_test6(PF_OUT, ifp, &m, NULL) != PF_PASS) {
error = EHOSTUNREACH;
m_freem(m);
goto done;
}
if (m == NULL)
goto done;
ip6 = mtod(m, struct ip6_hdr *);
#endif
/*
* Send the packet to the outgoing interface.
* If necessary, do IPv6 fragmentation before sending.
*
* the logic here is rather complex:
* 1: normal case (dontfrag == 0, alwaysfrag == 0)
* 1-a: send as is if tlen <= path mtu
* 1-b: fragment if tlen > path mtu
*
* 2: if user asks us not to fragment (dontfrag == 1)
* 2-a: send as is if tlen <= interface mtu
* 2-b: error if tlen > interface mtu
*
* 3: if we always need to attach fragment header (alwaysfrag == 1)
* always fragment
*
* 4: if dontfrag == 1 && alwaysfrag == 1
* error, as we cannot handle this conflicting request
*/
tlen = m->m_pkthdr.len;
if (opt && (opt->ip6po_flags & IP6PO_DONTFRAG))
dontfrag = 1;
else
dontfrag = 0;
if (dontfrag && alwaysfrag) { /* case 4 */
/* conflicting request - can't transmit */
error = EMSGSIZE;
goto bad;
}
if (dontfrag && tlen > IN6_LINKMTU(ifp)) { /* case 2-b */
/*
* Even if the DONTFRAG option is specified, we cannot send the
* packet when the data length is larger than the MTU of the
* outgoing interface.
* Notify the error by sending IPV6_PATHMTU ancillary data as
* well as returning an error code (the latter is not described
* in the API spec.)
*/
#if 0
u_int32_t mtu32;
struct ip6ctlparam ip6cp;
mtu32 = (u_int32_t)mtu;
bzero(&ip6cp, sizeof(ip6cp));
ip6cp.ip6c_cmdarg = (void *)&mtu32;
pfctlinput2(PRC_MSGSIZE, (struct sockaddr *)&ro_pmtu->ro_dst,
(void *)&ip6cp);
#endif
error = EMSGSIZE;
goto bad;
}
/*
* transmit packet without fragmentation
*/
if (dontfrag || (!alwaysfrag && tlen <= mtu)) { /* case 1-a and 2-a */
error = nd6_output(ifp, origifp, m, dst, ro->ro_rt);
goto done;
}
/*
* try to fragment the packet. case 1-b and 3
*/
if (mtu < IPV6_MMTU) {
/* path MTU cannot be less than IPV6_MMTU */
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_randomid());
u_char nextproto;
#if 0
struct ip6ctlparam ip6cp;
u_int32_t mtu32;
#endif
/*
* 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;
#if 0
/* Notify a proper path MTU to applications. */
mtu32 = (u_int32_t)mtu;
bzero(&ip6cp, sizeof(ip6cp));
ip6cp.ip6c_cmdarg = (void *)&mtu32;
pfctlinput2(PRC_MSGSIZE, (struct sockaddr *)&ro_pmtu->ro_dst,
(void *)&ip6cp);
#endif
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_pkthdr.rcvif = NULL;
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_int16_t)((off - hlen) & ~7));
if (off + len >= tlen)
len = tlen - off;
else
ip6f->ip6f_offlg |= IP6F_MORE_FRAG;
mhip6->ip6_plen = htons((u_int16_t)(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) {
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);
}
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, alwaysfragp)
struct route_in6 *ro_pmtu, *ro;
struct ifnet *ifp;
struct in6_addr *dst;
u_long *mtup;
int *alwaysfragp;
{
u_int32_t mtu = 0;
int alwaysfrag = 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 *)NULL;
}
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 < IPV6_MMTU) {
/*
* RFC2460 section 5, last paragraph:
* if we record ICMPv6 too big message with
* mtu < IPV6_MMTU, transmit packets sized IPV6_MMTU
* or smaller, with fragment header attached.
* (fragment header is needed regardless from the
* packet size, for translators to identify packets)
*/
alwaysfrag = 1;
mtu = IPV6_MMTU;
} 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).
*/
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;
if (alwaysfragp)
*alwaysfragp = alwaysfrag;
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;
{
int privileged, optdatalen, uproto;
void *optdata;
struct inpcb *inp = sotoinpcb(so);
struct mbuf *m = *mp;
int error, optval;
int optlen;
#ifdef IPSEC
struct proc *p = curproc; /* XXX */
struct tdb *tdb;
struct tdb_ident *tdbip, tdbi;
int s;
#endif
optlen = m ? m->m_len : 0;
error = optval = 0;
privileged = (inp->inp_socket->so_state & SS_PRIV);
uproto = (int)so->so_proto->pr_protocol;
if (level == IPPROTO_IPV6) {
switch (op) {
case PRCO_SETOPT:
switch (optname) {
case IPV6_2292PKTOPTIONS:
{
error = ip6_pcbopts(&inp->inp_outputopts6,
m, so);
break;
}
/*
* Use of some Hop-by-Hop options or some
* Destination options, might require special
* privilege. That is, normal applications
* (without special privilege) might be forbidden
* from setting certain options in outgoing packets,
* and might never see certain options in received
* packets. [RFC 2292 Section 6]
* KAME specific note:
* KAME prevents non-privileged users from sending or
* receiving ANY hbh/dst options in order to avoid
* overhead of parsing options in the kernel.
*/
case IPV6_RECVHOPOPTS:
case IPV6_RECVDSTOPTS:
case IPV6_RECVRTHDRDSTOPTS:
if (!privileged) {
error = EPERM;
break;
}
/* FALLTHROUGH */
case IPV6_UNICAST_HOPS:
case IPV6_HOPLIMIT:
case IPV6_FAITH:
case IPV6_RECVPKTINFO:
case IPV6_RECVHOPLIMIT:
case IPV6_RECVRTHDR:
case IPV6_RECVPATHMTU:
case IPV6_RECVTCLASS:
case IPV6_V6ONLY:
case IPV6_AUTOFLOWLABEL:
if (optlen != 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 */
inp->inp_hops = optval;
}
break;
#define OPTSET(bit) \
do { \
if (optval) \
inp->inp_flags |= (bit); \
else \
inp->inp_flags &= ~(bit); \
} while (/*CONSTCOND*/ 0)
#define OPTSET2292(bit) \
do { \
inp->inp_flags |= IN6P_RFC2292; \
if (optval) \
inp->inp_flags |= (bit); \
else \
inp->inp_flags &= ~(bit); \
} while (/*CONSTCOND*/ 0)
#define OPTBIT(bit) (inp->inp_flags & (bit) ? 1 : 0)
case IPV6_RECVPKTINFO:
/* cannot mix with RFC2292 */
if (OPTBIT(IN6P_RFC2292)) {
error = EINVAL;
break;
}
OPTSET(IN6P_PKTINFO);
break;
case IPV6_HOPLIMIT:
{
struct ip6_pktopts **optp;
/* cannot mix with RFC2292 */
if (OPTBIT(IN6P_RFC2292)) {
error = EINVAL;
break;
}
optp = &inp->inp_outputopts6;
error = ip6_pcbopt(IPV6_HOPLIMIT,
(u_char *)&optval,
sizeof(optval),
optp,
privileged, uproto);
break;
}
case IPV6_RECVHOPLIMIT:
/* cannot mix with RFC2292 */
if (OPTBIT(IN6P_RFC2292)) {
error = EINVAL;
break;
}
OPTSET(IN6P_HOPLIMIT);
break;
case IPV6_RECVHOPOPTS:
/* cannot mix with RFC2292 */
if (OPTBIT(IN6P_RFC2292)) {
error = EINVAL;
break;
}
OPTSET(IN6P_HOPOPTS);
break;
case IPV6_RECVDSTOPTS:
/* cannot mix with RFC2292 */
if (OPTBIT(IN6P_RFC2292)) {
error = EINVAL;
break;
}
OPTSET(IN6P_DSTOPTS);
break;
case IPV6_RECVRTHDRDSTOPTS:
/* cannot mix with RFC2292 */
if (OPTBIT(IN6P_RFC2292)) {
error = EINVAL;
break;
}
OPTSET(IN6P_RTHDRDSTOPTS);
break;
case IPV6_RECVRTHDR:
/* cannot mix with RFC2292 */
if (OPTBIT(IN6P_RFC2292)) {
error = EINVAL;
break;
}
OPTSET(IN6P_RTHDR);
break;
case IPV6_FAITH:
OPTSET(IN6P_FAITH);
break;
case IPV6_RECVPATHMTU:
/*
* We ignore this option for TCP
* sockets.
* (RFC3542 leaves this case
* unspecified.)
*/
if (uproto != IPPROTO_TCP)
OPTSET(IN6P_MTU);
break;
case IPV6_V6ONLY:
/*
* make setsockopt(IPV6_V6ONLY)
* available only prior to bind(2).
* see ipng mailing list, Jun 22 2001.
*/
if (inp->inp_lport ||
!IN6_IS_ADDR_UNSPECIFIED(&inp->inp_laddr6)) {
error = EINVAL;
break;
}
if ((ip6_v6only && optval) ||
(!ip6_v6only && !optval))
error = 0;
else
error = EINVAL;
break;
case IPV6_RECVTCLASS:
/* cannot mix with RFC2292 XXX */
if (OPTBIT(IN6P_RFC2292)) {
error = EINVAL;
break;
}
OPTSET(IN6P_TCLASS);
break;
case IPV6_AUTOFLOWLABEL:
OPTSET(IN6P_AUTOFLOWLABEL);
break;
}
break;
case IPV6_TCLASS:
case IPV6_DONTFRAG:
case IPV6_USE_MIN_MTU:
if (optlen != sizeof(optval)) {
error = EINVAL;
break;
}
optval = *mtod(m, int *);
{
struct ip6_pktopts **optp;
optp = &inp->inp_outputopts6;
error = ip6_pcbopt(optname,
(u_char *)&optval,
sizeof(optval),
optp,
privileged, uproto);
break;
}
case IPV6_2292PKTINFO:
case IPV6_2292HOPLIMIT:
case IPV6_2292HOPOPTS:
case IPV6_2292DSTOPTS:
case IPV6_2292RTHDR:
/* RFC 2292 */
if (optlen != sizeof(int)) {
error = EINVAL;
break;
}
optval = *mtod(m, int *);
switch (optname) {
case IPV6_2292PKTINFO:
OPTSET2292(IN6P_PKTINFO);
break;
case IPV6_2292HOPLIMIT:
OPTSET2292(IN6P_HOPLIMIT);
break;
case IPV6_2292HOPOPTS:
/*
* Check super-user privilege.
* See comments for IPV6_RECVHOPOPTS.
*/
if (!privileged)
return (EPERM);
OPTSET2292(IN6P_HOPOPTS);
break;
case IPV6_2292DSTOPTS:
if (!privileged)
return (EPERM);
OPTSET2292(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */
break;
case IPV6_2292RTHDR:
OPTSET2292(IN6P_RTHDR);
break;
}
break;
case IPV6_PKTINFO:
case IPV6_HOPOPTS:
case IPV6_RTHDR:
case IPV6_DSTOPTS:
case IPV6_RTHDRDSTOPTS:
case IPV6_NEXTHOP:
{
/* new advanced API (RFC3542) */
u_char *optbuf;
int optbuflen;
struct ip6_pktopts **optp;
/* cannot mix with RFC2292 */
if (OPTBIT(IN6P_RFC2292)) {
error = EINVAL;
break;
}
if (m && m->m_next) {
error = EINVAL; /* XXX */
break;
}
if (m) {
optbuf = mtod(m, u_char *);
optbuflen = m->m_len;
} else {
optbuf = NULL;
optbuflen = 0;
}
optp = &inp->inp_outputopts6;
error = ip6_pcbopt(optname,
optbuf, optbuflen,
optp, privileged, uproto);
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,
&inp->inp_moptions6,
m);
break;
case IPV6_PORTRANGE:
optval = *mtod(m, int *);
switch (optval) {
case IPV6_PORTRANGE_DEFAULT:
inp->inp_flags &= ~(IN6P_LOWPORT);
inp->inp_flags &= ~(IN6P_HIGHPORT);
break;
case IPV6_PORTRANGE_HIGH:
inp->inp_flags &= ~(IN6P_LOWPORT);
inp->inp_flags |= IN6P_HIGHPORT;
break;
case IPV6_PORTRANGE_LOW:
inp->inp_flags &= ~(IN6P_HIGHPORT);
inp->inp_flags |= IN6P_LOWPORT;
break;
default:
error = EINVAL;
break;
}
break;
case IPSEC6_OUTSA:
#ifndef IPSEC
error = EINVAL;
#else
s = spltdb();
if (m == 0 || m->m_len != sizeof(struct tdb_ident)) {
error = EINVAL;
} else {
tdbip = mtod(m, struct tdb_ident *);
tdb = gettdb(tdbip->spi, &tdbip->dst,
tdbip->proto);
if (tdb == NULL)
error = ESRCH;
else
tdb_add_inp(tdb, inp, 0);
}
splx(s);
#endif
break;
case IPV6_AUTH_LEVEL:
case IPV6_ESP_TRANS_LEVEL:
case IPV6_ESP_NETWORK_LEVEL:
case IPV6_IPCOMP_LEVEL:
#ifndef IPSEC
error = EINVAL;
#else
if (m == 0 || m->m_len != sizeof(int)) {
error = EINVAL;
break;
}
optval = *mtod(m, int *);
if (optval < IPSEC_LEVEL_BYPASS ||
optval > IPSEC_LEVEL_UNIQUE) {
error = EINVAL;
break;
}
switch (optname) {
case IPV6_AUTH_LEVEL:
if (optval < ipsec_auth_default_level &&
suser(p, 0)) {
error = EACCES;
break;
}
inp->inp_seclevel[SL_AUTH] = optval;
break;
case IPV6_ESP_TRANS_LEVEL:
if (optval < ipsec_esp_trans_default_level &&
suser(p, 0)) {
error = EACCES;
break;
}
inp->inp_seclevel[SL_ESP_TRANS] = optval;
break;
case IPV6_ESP_NETWORK_LEVEL:
if (optval < ipsec_esp_network_default_level &&
suser(p, 0)) {
error = EACCES;
break;
}
inp->inp_seclevel[SL_ESP_NETWORK] = optval;
break;
case IPV6_IPCOMP_LEVEL:
if (optval < ipsec_ipcomp_default_level &&
suser(p, 0)) {
error = EACCES;
break;
}
inp->inp_seclevel[SL_IPCOMP] = optval;
break;
}
if (!error)
inp->inp_secrequire = get_sa_require(inp);
#endif
break;
default:
error = ENOPROTOOPT;
break;
}
if (m)
(void)m_free(m);
break;
case PRCO_GETOPT:
switch (optname) {
case IPV6_2292PKTOPTIONS:
/*
* RFC3542 (effectively) deprecated the
* semantics of the 2292-style pktoptions.
* Since it was not reliable in nature (i.e.,
* applications had to expect the lack of some
* information after all), it would make sense
* to simplify this part by always returning
* empty data.
*/
*mp = m_get(M_WAIT, MT_SOOPTS);
(*mp)->m_len = 0;
break;
case IPV6_RECVHOPOPTS:
case IPV6_RECVDSTOPTS:
case IPV6_RECVRTHDRDSTOPTS:
case IPV6_UNICAST_HOPS:
case IPV6_RECVPKTINFO:
case IPV6_RECVHOPLIMIT:
case IPV6_RECVRTHDR:
case IPV6_RECVPATHMTU:
case IPV6_FAITH:
case IPV6_V6ONLY:
case IPV6_PORTRANGE:
case IPV6_RECVTCLASS:
case IPV6_AUTOFLOWLABEL:
switch (optname) {
case IPV6_RECVHOPOPTS:
optval = OPTBIT(IN6P_HOPOPTS);
break;
case IPV6_RECVDSTOPTS:
optval = OPTBIT(IN6P_DSTOPTS);
break;
case IPV6_RECVRTHDRDSTOPTS:
optval = OPTBIT(IN6P_RTHDRDSTOPTS);
break;
case IPV6_UNICAST_HOPS:
optval = inp->inp_hops;
break;
case IPV6_RECVPKTINFO:
optval = OPTBIT(IN6P_PKTINFO);
break;
case IPV6_RECVHOPLIMIT:
optval = OPTBIT(IN6P_HOPLIMIT);
break;
case IPV6_RECVRTHDR:
optval = OPTBIT(IN6P_RTHDR);
break;
case IPV6_RECVPATHMTU:
optval = OPTBIT(IN6P_MTU);
break;
case IPV6_FAITH:
optval = OPTBIT(IN6P_FAITH);
break;
case IPV6_V6ONLY:
optval = (ip6_v6only != 0); /* XXX */
break;
case IPV6_PORTRANGE:
{
int flags;
flags = inp->inp_flags;
if (flags & IN6P_HIGHPORT)
optval = IPV6_PORTRANGE_HIGH;
else if (flags & IN6P_LOWPORT)
optval = IPV6_PORTRANGE_LOW;
else
optval = 0;
break;
}
case IPV6_RECVTCLASS:
optval = OPTBIT(IN6P_TCLASS);
break;
case IPV6_AUTOFLOWLABEL:
optval = OPTBIT(IN6P_AUTOFLOWLABEL);
break;
}
if (error)
break;
*mp = m = m_get(M_WAIT, MT_SOOPTS);
m->m_len = sizeof(int);
*mtod(m, int *) = optval;
break;
case IPV6_PATHMTU:
{
u_long pmtu = 0;
struct ip6_mtuinfo mtuinfo;
struct route_in6 *ro = (struct route_in6 *)&inp->inp_route6;
if (!(so->so_state & SS_ISCONNECTED))
return (ENOTCONN);
/*
* XXX: we dot not consider the case of source
* routing, or optional information to specify
* the outgoing interface.
*/
error = ip6_getpmtu(ro, NULL, NULL,
&inp->inp_faddr6, &pmtu, NULL);
if (error)
break;
if (pmtu > IPV6_MAXPACKET)
pmtu = IPV6_MAXPACKET;
bzero(&mtuinfo, sizeof(mtuinfo));
mtuinfo.ip6m_mtu = (u_int32_t)pmtu;
optdata = (void *)&mtuinfo;
optdatalen = sizeof(mtuinfo);
if (optdatalen > MCLBYTES)
return (EMSGSIZE); /* XXX */
*mp = m = m_get(M_WAIT, MT_SOOPTS);
if (optdatalen > MLEN)
MCLGET(m, M_WAIT);
m->m_len = optdatalen;
bcopy(optdata, mtod(m, void *), optdatalen);
break;
}
case IPV6_2292PKTINFO:
case IPV6_2292HOPLIMIT:
case IPV6_2292HOPOPTS:
case IPV6_2292RTHDR:
case IPV6_2292DSTOPTS:
switch (optname) {
case IPV6_2292PKTINFO:
optval = OPTBIT(IN6P_PKTINFO);
break;
case IPV6_2292HOPLIMIT:
optval = OPTBIT(IN6P_HOPLIMIT);
break;
case IPV6_2292HOPOPTS:
optval = OPTBIT(IN6P_HOPOPTS);
break;
case IPV6_2292RTHDR:
optval = OPTBIT(IN6P_RTHDR);
break;
case IPV6_2292DSTOPTS:
optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS);
break;
}
*mp = m = m_get(M_WAIT, MT_SOOPTS);
m->m_len = sizeof(int);
*mtod(m, int *) = optval;
break;
case IPV6_PKTINFO:
case IPV6_HOPOPTS:
case IPV6_RTHDR:
case IPV6_DSTOPTS:
case IPV6_RTHDRDSTOPTS:
case IPV6_NEXTHOP:
case IPV6_TCLASS:
case IPV6_DONTFRAG:
case IPV6_USE_MIN_MTU:
error = ip6_getpcbopt(inp->inp_outputopts6,
optname, mp);
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,
inp->inp_moptions6, mp);
break;
case IPSEC6_OUTSA:
#ifndef IPSEC
error = EINVAL;
#else
s = spltdb();
if (inp->inp_tdb_out == NULL) {
error = ENOENT;
} else {
tdbi.spi = inp->inp_tdb_out->tdb_spi;
tdbi.dst = inp->inp_tdb_out->tdb_dst;
tdbi.proto = inp->inp_tdb_out->tdb_sproto;
*mp = m = m_get(M_WAIT, MT_SOOPTS);
m->m_len = sizeof(tdbi);
bcopy((caddr_t)&tdbi, mtod(m, caddr_t),
(unsigned)m->m_len);
}
splx(s);
#endif
break;
case IPV6_AUTH_LEVEL:
case IPV6_ESP_TRANS_LEVEL:
case IPV6_ESP_NETWORK_LEVEL:
case IPV6_IPCOMP_LEVEL:
#ifndef IPSEC
m->m_len = sizeof(int);
*mtod(m, int *) = IPSEC_LEVEL_NONE;
#else
m->m_len = sizeof(int);
switch (optname) {
case IPV6_AUTH_LEVEL:
optval = inp->inp_seclevel[SL_AUTH];
break;
case IPV6_ESP_TRANS_LEVEL:
optval =
inp->inp_seclevel[SL_ESP_TRANS];
break;
case IPV6_ESP_NETWORK_LEVEL:
optval =
inp->inp_seclevel[SL_ESP_NETWORK];
break;
case IPV6_IPCOMP_LEVEL:
optval = inp->inp_seclevel[SL_IPCOMP];
break;
}
*mtod(m, int *) = optval;
#endif
break;
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 inpcb *inp = sotoinpcb(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.
*
* RFC3542 says: "An attempt to set IPV6_CHECKSUM
* for an ICMPv6 socket will fail."
* The current behavior does not meet RFC3542.
*/
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
inp->in6p_cksum = optval;
break;
case PRCO_GETOPT:
if (so->so_proto->pr_protocol == IPPROTO_ICMPV6)
optval = icmp6off;
else
optval = inp->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)
ip6_clearpktopts(opt, -1);
else
opt = malloc(sizeof(*opt), M_IP6OPT, M_WAITOK);
*pktopt = 0;
if (!m || m->m_len == 0) {
/*
* Only turning off any previous options, regardless of
* whether the opt is just created or given.
*/
free(opt, M_IP6OPT);
return (0);
}
/* set options specified by user. */
if (p && !suser(p, 0))
priv = 1;
if ((error = ip6_setpktopts(m, opt, NULL, priv,
so->so_proto->pr_protocol)) != 0) {
ip6_clearpktopts(opt, -1); /* XXX discard all options */
free(opt, M_IP6OPT);
return (error);
}
*pktopt = opt;
return (0);
}
/*
* initialize ip6_pktopts. beware that there are non-zero default values in
* the struct.
*/
void
ip6_initpktopts(opt)
struct ip6_pktopts *opt;
{
bzero(opt, sizeof(*opt));
opt->ip6po_hlim = -1; /* -1 means default hop limit */
opt->ip6po_tclass = -1; /* -1 means default traffic class */
opt->ip6po_minmtu = IP6PO_MINMTU_MCASTONLY;
}
#define sin6tosa(sin6) ((struct sockaddr *)(sin6)) /* XXX */
static int
ip6_pcbopt(optname, buf, len, pktopt, priv, uproto)
int optname, len, priv;
u_char *buf;
struct ip6_pktopts **pktopt;
int uproto;
{
struct ip6_pktopts *opt;
if (*pktopt == NULL) {
*pktopt = malloc(sizeof(struct ip6_pktopts), M_IP6OPT,
M_WAITOK);
ip6_initpktopts(*pktopt);
}
opt = *pktopt;
return (ip6_setpktopt(optname, buf, len, opt, priv, 1, 0, uproto));
}
static int
ip6_getpcbopt(pktopt, optname, mp)
struct ip6_pktopts *pktopt;
int optname;
struct mbuf **mp;
{
void *optdata = NULL;
int optdatalen = 0;
struct ip6_ext *ip6e;
int error = 0;
struct in6_pktinfo null_pktinfo;
int deftclass = 0, on;
int defminmtu = IP6PO_MINMTU_MCASTONLY;
struct mbuf *m;
switch (optname) {
case IPV6_PKTINFO:
if (pktopt && pktopt->ip6po_pktinfo)
optdata = (void *)pktopt->ip6po_pktinfo;
else {
/* XXX: we don't have to do this every time... */
bzero(&null_pktinfo, sizeof(null_pktinfo));
optdata = (void *)&null_pktinfo;
}
optdatalen = sizeof(struct in6_pktinfo);
break;
case IPV6_TCLASS:
if (pktopt && pktopt->ip6po_tclass >= 0)
optdata = (void *)&pktopt->ip6po_tclass;
else
optdata = (void *)&deftclass;
optdatalen = sizeof(int);
break;
case IPV6_HOPOPTS:
if (pktopt && pktopt->ip6po_hbh) {
optdata = (void *)pktopt->ip6po_hbh;
ip6e = (struct ip6_ext *)pktopt->ip6po_hbh;
optdatalen = (ip6e->ip6e_len + 1) << 3;
}
break;
case IPV6_RTHDR:
if (pktopt && pktopt->ip6po_rthdr) {
optdata = (void *)pktopt->ip6po_rthdr;
ip6e = (struct ip6_ext *)pktopt->ip6po_rthdr;
optdatalen = (ip6e->ip6e_len + 1) << 3;
}
break;
case IPV6_RTHDRDSTOPTS:
if (pktopt && pktopt->ip6po_dest1) {
optdata = (void *)pktopt->ip6po_dest1;
ip6e = (struct ip6_ext *)pktopt->ip6po_dest1;
optdatalen = (ip6e->ip6e_len + 1) << 3;
}
break;
case IPV6_DSTOPTS:
if (pktopt && pktopt->ip6po_dest2) {
optdata = (void *)pktopt->ip6po_dest2;
ip6e = (struct ip6_ext *)pktopt->ip6po_dest2;
optdatalen = (ip6e->ip6e_len + 1) << 3;
}
break;
case IPV6_NEXTHOP:
if (pktopt && pktopt->ip6po_nexthop) {
optdata = (void *)pktopt->ip6po_nexthop;
optdatalen = pktopt->ip6po_nexthop->sa_len;
}
break;
case IPV6_USE_MIN_MTU:
if (pktopt)
optdata = (void *)&pktopt->ip6po_minmtu;
else
optdata = (void *)&defminmtu;
optdatalen = sizeof(int);
break;
case IPV6_DONTFRAG:
if (pktopt && ((pktopt->ip6po_flags) & IP6PO_DONTFRAG))
on = 1;
else
on = 0;
optdata = (void *)&on;
optdatalen = sizeof(on);
break;
default: /* should not happen */
#ifdef DIAGNOSTIC
panic("ip6_getpcbopt: unexpected option\n");
#endif
return (ENOPROTOOPT);
}
if (optdatalen > MCLBYTES)
return (EMSGSIZE); /* XXX */
*mp = m = m_get(M_WAIT, MT_SOOPTS);
if (optdatalen > MLEN)
MCLGET(m, M_WAIT);
m->m_len = optdatalen;
if (optdatalen)
bcopy(optdata, mtod(m, void *), optdatalen);
return (error);
}
void
ip6_clearpktopts(pktopt, optname)
struct ip6_pktopts *pktopt;
int optname;
{
if (optname == -1 || optname == IPV6_PKTINFO) {
if (pktopt->ip6po_pktinfo)
free(pktopt->ip6po_pktinfo, M_IP6OPT);
pktopt->ip6po_pktinfo = NULL;
}
if (optname == -1 || optname == IPV6_HOPLIMIT)
pktopt->ip6po_hlim = -1;
if (optname == -1 || optname == IPV6_TCLASS)
pktopt->ip6po_tclass = -1;
if (optname == -1 || optname == IPV6_NEXTHOP) {
if (pktopt->ip6po_nextroute.ro_rt) {
RTFREE(pktopt->ip6po_nextroute.ro_rt);
pktopt->ip6po_nextroute.ro_rt = NULL;
}
if (pktopt->ip6po_nexthop)
free(pktopt->ip6po_nexthop, M_IP6OPT);
pktopt->ip6po_nexthop = NULL;
}
if (optname == -1 || optname == IPV6_HOPOPTS) {
if (pktopt->ip6po_hbh)
free(pktopt->ip6po_hbh, M_IP6OPT);
pktopt->ip6po_hbh = NULL;
}
if (optname == -1 || optname == IPV6_RTHDRDSTOPTS) {
if (pktopt->ip6po_dest1)
free(pktopt->ip6po_dest1, M_IP6OPT);
pktopt->ip6po_dest1 = NULL;
}
if (optname == -1 || optname == IPV6_RTHDR) {
if (pktopt->ip6po_rhinfo.ip6po_rhi_rthdr)
free(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT);
pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL;
if (pktopt->ip6po_route.ro_rt) {
RTFREE(pktopt->ip6po_route.ro_rt);
pktopt->ip6po_route.ro_rt = NULL;
}
}
if (optname == -1 || optname == IPV6_DSTOPTS) {
if (pktopt->ip6po_dest2)
free(pktopt->ip6po_dest2, M_IP6OPT);
pktopt->ip6po_dest2 = NULL;
}
}
#define PKTOPT_EXTHDRCPY(type) \
do {\
if (src->type) {\
int hlen = (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\
dst->type = malloc(hlen, M_IP6OPT, canwait);\
if (dst->type == NULL && canwait == M_NOWAIT)\
goto bad;\
bcopy(src->type, dst->type, hlen);\
}\
} while (/*CONSTCOND*/ 0)
static int
copypktopts(dst, src, canwait)
struct ip6_pktopts *dst, *src;
int canwait;
{
dst->ip6po_hlim = src->ip6po_hlim;
dst->ip6po_tclass = src->ip6po_tclass;
dst->ip6po_flags = src->ip6po_flags;
if (src->ip6po_pktinfo) {
dst->ip6po_pktinfo = malloc(sizeof(*dst->ip6po_pktinfo),
M_IP6OPT, canwait);
if (dst->ip6po_pktinfo == NULL && canwait == M_NOWAIT)
goto bad;
*dst->ip6po_pktinfo = *src->ip6po_pktinfo;
}
if (src->ip6po_nexthop) {
dst->ip6po_nexthop = malloc(src->ip6po_nexthop->sa_len,
M_IP6OPT, canwait);
if (dst->ip6po_nexthop == NULL && canwait == M_NOWAIT)
goto bad;
bcopy(src->ip6po_nexthop, dst->ip6po_nexthop,
src->ip6po_nexthop->sa_len);
}
PKTOPT_EXTHDRCPY(ip6po_hbh);
PKTOPT_EXTHDRCPY(ip6po_dest1);
PKTOPT_EXTHDRCPY(ip6po_dest2);
PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */
return (0);
bad:
if (dst->ip6po_pktinfo) free(dst->ip6po_pktinfo, M_IP6OPT);
if (dst->ip6po_nexthop) free(dst->ip6po_nexthop, M_IP6OPT);
if (dst->ip6po_hbh) free(dst->ip6po_hbh, M_IP6OPT);
if (dst->ip6po_dest1) free(dst->ip6po_dest1, M_IP6OPT);
if (dst->ip6po_dest2) free(dst->ip6po_dest2, M_IP6OPT);
if (dst->ip6po_rthdr) free(dst->ip6po_rthdr, M_IP6OPT);
return (ENOBUFS);
}
#undef PKTOPT_EXTHDRCPY
struct ip6_pktopts *
ip6_copypktopts(src, canwait)
struct ip6_pktopts *src;
int canwait;
{
int error;
struct ip6_pktopts *dst;
dst = malloc(sizeof(*dst), M_IP6OPT, canwait);
if (dst == NULL && canwait == M_NOWAIT)
return (NULL);
ip6_initpktopts(dst);
if ((error = copypktopts(dst, src, canwait)) != 0) {
free(dst, M_IP6OPT);
return (NULL);
}
return (dst);
}
void
ip6_freepcbopts(pktopt)
struct ip6_pktopts *pktopt;
{
if (pktopt == NULL)
return;
ip6_clearpktopts(pktopt, -1);
free(pktopt, M_IP6OPT);
}
/*
* 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)
ifp = NULL;
else {
if (ifindex < 0 || if_indexlim <= ifindex ||
!ifindex2ifnet[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, 0))
{
error = EACCES;
break;
}
} else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) {
error = EINVAL;
break;
}
/*
* If no interface was explicitly specified, choose an
* appropriate one according to the given multicast address.
*/
if (mreq->ipv6mr_interface == 0) {
/*
* Look up the routing table for the
* address, and choose the outgoing interface.
* XXX: is it a good approach?
*/
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 {
/*
* If the interface is specified, validate it.
*/
if (mreq->ipv6mr_interface < 0 ||
if_indexlim <= mreq->ipv6mr_interface ||
!ifindex2ifnet[mreq->ipv6mr_interface]) {
error = ENXIO; /* XXX EINVAL? */
break;
}
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/interface-local scope.
*/
if (IN6_IS_SCOPE_EMBED(&mreq->ipv6mr_multiaddr)) {
mreq->ipv6mr_multiaddr.s6_addr16[1] =
htons(ifp->if_index);
}
/*
* See if the membership already exists.
*/
LIST_FOREACH(imm, &im6o->im6o_memberships, i6mm_chain)
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, 0))
{
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)
ifp = NULL;
else {
if (mreq->ipv6mr_interface < 0 ||
if_indexlim <= mreq->ipv6mr_interface ||
!ifindex2ifnet[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.
*/
LIST_FOREACH(imm, &im6o->im6o_memberships, i6mm_chain) {
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 option
* structure.
*/
if (im6o->im6o_multicast_ifp == NULL &&
im6o->im6o_multicast_hlim == ip6_defmcasthlim &&
im6o->im6o_multicast_loop == IPV6_DEFAULT_MULTICAST_LOOP &&
LIST_EMPTY(&im6o->im6o_memberships)) {
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 (!LIST_EMPTY(&im6o->im6o_memberships)) {
imm = LIST_FIRST(&im6o->im6o_memberships);
LIST_REMOVE(imm, i6mm_chain);
in6_leavegroup(imm);
}
free(im6o, M_IPMOPTS);
}
/*
* Set IPv6 outgoing packet options based on advanced API.
*/
int
ip6_setpktopts(control, opt, stickyopt, priv, uproto)
struct mbuf *control;
struct ip6_pktopts *opt, *stickyopt;
int priv, uproto;
{
struct cmsghdr *cm = 0;
if (control == NULL || opt == NULL)
return (EINVAL);
ip6_initpktopts(opt);
if (stickyopt) {
int error;
/*
* If stickyopt is provided, make a local copy of the options
* for this particular packet, then override them by ancillary
* objects.
* XXX: copypktopts() does not copy the cached route to a next
* hop (if any). This is not very good in terms of efficiency,
* but we can allow this since this option should be rarely
* used.
*/
if ((error = copypktopts(opt, stickyopt, M_NOWAIT)) != 0)
return (error);
}
/*
* XXX: Currently, we assume all the optional information is stored
* in a single mbuf.
*/
if (control->m_next)
return (EINVAL);
for (; control->m_len; control->m_data += CMSG_ALIGN(cm->cmsg_len),
control->m_len -= CMSG_ALIGN(cm->cmsg_len)) {
int error;
if (control->m_len < CMSG_LEN(0))
return (EINVAL);
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;
error = ip6_setpktopt(cm->cmsg_type, CMSG_DATA(cm),
cm->cmsg_len - CMSG_LEN(0), opt, priv, 0, 1, uproto);
if (error)
return (error);
}
return (0);
}
/*
* Set a particular packet option, as a sticky option or an ancillary data
* item. "len" can be 0 only when it's a sticky option.
* We have 4 cases of combination of "sticky" and "cmsg":
* "sticky=0, cmsg=0": impossible
* "sticky=0, cmsg=1": RFC2292 or RFC3542 ancillary data
* "sticky=1, cmsg=0": RFC3542 socket option
* "sticky=1, cmsg=1": RFC2292 socket option
*/
static int
ip6_setpktopt(optname, buf, len, opt, priv, sticky, cmsg, uproto)
int optname, len, priv, sticky, cmsg, uproto;
u_char *buf;
struct ip6_pktopts *opt;
{
int minmtupolicy;
if (!sticky && !cmsg) {
#ifdef DIAGNOSTIC
printf("ip6_setpktopt: impossible case\n");
#endif
return (EINVAL);
}
/*
* IPV6_2292xxx is for backward compatibility to RFC2292, and should
* not be specified in the context of RFC3542. Conversely,
* RFC3542 types should not be specified in the context of RFC2292.
*/
if (!cmsg) {
switch (optname) {
case IPV6_2292PKTINFO:
case IPV6_2292HOPLIMIT:
case IPV6_2292NEXTHOP:
case IPV6_2292HOPOPTS:
case IPV6_2292DSTOPTS:
case IPV6_2292RTHDR:
case IPV6_2292PKTOPTIONS:
return (ENOPROTOOPT);
}
}
if (sticky && cmsg) {
switch (optname) {
case IPV6_PKTINFO:
case IPV6_HOPLIMIT:
case IPV6_NEXTHOP:
case IPV6_HOPOPTS:
case IPV6_DSTOPTS:
case IPV6_RTHDRDSTOPTS:
case IPV6_RTHDR:
case IPV6_USE_MIN_MTU:
case IPV6_DONTFRAG:
case IPV6_TCLASS:
return (ENOPROTOOPT);
}
}
switch (optname) {
case IPV6_2292PKTINFO:
case IPV6_PKTINFO:
{
struct ifnet *ifp = NULL;
struct in6_pktinfo *pktinfo;
if (len != sizeof(struct in6_pktinfo))
return (EINVAL);
pktinfo = (struct in6_pktinfo *)buf;
/*
* An application can clear any sticky IPV6_PKTINFO option by
* doing a "regular" setsockopt with ipi6_addr being
* in6addr_any and ipi6_ifindex being zero.
* [RFC 3542, Section 6]
*/
if (optname == IPV6_PKTINFO && opt->ip6po_pktinfo &&
pktinfo->ipi6_ifindex == 0 &&
IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) {
ip6_clearpktopts(opt, optname);
break;
}
if (uproto == IPPROTO_TCP && optname == IPV6_PKTINFO &&
sticky && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) {
return (EINVAL);
}
/* validate the interface index if specified. */
if (pktinfo->ipi6_ifindex >= if_indexlim ||
pktinfo->ipi6_ifindex < 0) {
return (ENXIO);
}
if (pktinfo->ipi6_ifindex) {
ifp = ifindex2ifnet[pktinfo->ipi6_ifindex];
if (ifp == NULL)
return (ENXIO);
}
/*
* We store the address anyway, and let in6_selectsrc()
* validate the specified address. This is because ipi6_addr
* may not have enough information about its scope zone, and
* we may need additional information (such as outgoing
* interface or the scope zone of a destination address) to
* disambiguate the scope.
* XXX: the delay of the validation may confuse the
* application when it is used as a sticky option.
*/
if (opt->ip6po_pktinfo == NULL) {
opt->ip6po_pktinfo = malloc(sizeof(*pktinfo),
M_IP6OPT, M_NOWAIT);
if (opt->ip6po_pktinfo == NULL)
return (ENOBUFS);
}
bcopy(pktinfo, opt->ip6po_pktinfo, sizeof(*pktinfo));
break;
}
case IPV6_2292HOPLIMIT:
case IPV6_HOPLIMIT:
{
int *hlimp;
/*
* RFC 3542 deprecated the usage of sticky IPV6_HOPLIMIT
* to simplify the ordering among hoplimit options.
*/
if (optname == IPV6_HOPLIMIT && sticky)
return (ENOPROTOOPT);
if (len != sizeof(int))
return (EINVAL);
hlimp = (int *)buf;
if (*hlimp < -1 || *hlimp > 255)
return (EINVAL);
opt->ip6po_hlim = *hlimp;
break;
}
case IPV6_TCLASS:
{
int tclass;
if (len != sizeof(int))
return (EINVAL);
tclass = *(int *)buf;
if (tclass < -1 || tclass > 255)
return (EINVAL);
opt->ip6po_tclass = tclass;
break;
}
case IPV6_2292NEXTHOP:
case IPV6_NEXTHOP:
if (!priv)
return (EPERM);
if (len == 0) { /* just remove the option */
ip6_clearpktopts(opt, IPV6_NEXTHOP);
break;
}
/* check if cmsg_len is large enough for sa_len */
if (len < sizeof(struct sockaddr) || len < *buf)
return (EINVAL);
switch (((struct sockaddr *)buf)->sa_family) {
case AF_INET6:
{
struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)buf;
if (sa6->sin6_len != sizeof(struct sockaddr_in6))
return (EINVAL);
if (IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr) ||
IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) {
return (EINVAL);
}
if (IN6_IS_SCOPE_EMBED(&sa6->sin6_addr)) {
if (sa6->sin6_scope_id < 0 ||
if_indexlim <= sa6->sin6_scope_id ||
!ifindex2ifnet[sa6->sin6_scope_id])
return (EINVAL);
sa6->sin6_addr.s6_addr16[1] =
htonl(sa6->sin6_scope_id);
} else if (sa6->sin6_scope_id)
return (EINVAL);
break;
}
case AF_LINK: /* eventually be supported? */
default:
return (EAFNOSUPPORT);
}
/* turn off the previous option, then set the new option. */
ip6_clearpktopts(opt, IPV6_NEXTHOP);
opt->ip6po_nexthop = malloc(*buf, M_IP6OPT, M_NOWAIT);
if (opt->ip6po_nexthop == NULL)
return (ENOBUFS);
bcopy(buf, opt->ip6po_nexthop, *buf);
break;
case IPV6_2292HOPOPTS:
case IPV6_HOPOPTS:
{
struct ip6_hbh *hbh;
int hbhlen;
/*
* XXX: We don't allow a non-privileged user to set ANY HbH
* options, since per-option restriction has too much
* overhead.
*/
if (!priv)
return (EPERM);
if (len == 0) {
ip6_clearpktopts(opt, IPV6_HOPOPTS);
break; /* just remove the option */
}
/* message length validation */
if (len < sizeof(struct ip6_hbh))
return (EINVAL);
hbh = (struct ip6_hbh *)buf;
hbhlen = (hbh->ip6h_len + 1) << 3;
if (len != hbhlen)
return (EINVAL);
/* turn off the previous option, then set the new option. */
ip6_clearpktopts(opt, IPV6_HOPOPTS);
opt->ip6po_hbh = malloc(hbhlen, M_IP6OPT, M_NOWAIT);
if (opt->ip6po_hbh == NULL)
return (ENOBUFS);
bcopy(hbh, opt->ip6po_hbh, hbhlen);
break;
}
case IPV6_2292DSTOPTS:
case IPV6_DSTOPTS:
case IPV6_RTHDRDSTOPTS:
{
struct ip6_dest *dest, **newdest = NULL;
int destlen;
if (!priv) /* XXX: see the comment for IPV6_HOPOPTS */
return (EPERM);
if (len == 0) {
ip6_clearpktopts(opt, optname);
break; /* just remove the option */
}
/* message length validation */
if (len < sizeof(struct ip6_dest))
return (EINVAL);
dest = (struct ip6_dest *)buf;
destlen = (dest->ip6d_len + 1) << 3;
if (len != destlen)
return (EINVAL);
/*
* Determine the position that the destination options header
* should be inserted; before or after the routing header.
*/
switch (optname) {
case IPV6_2292DSTOPTS:
/*
* The old advanced API is ambiguous on this point.
* Our approach is to determine the position based
* according to the existence of a routing header.
* Note, however, that this depends on the order of the
* extension headers in the ancillary data; the 1st
* part of the destination options header must appear
* before the routing header in the ancillary data,
* too.
* RFC3542 solved the ambiguity by introducing
* separate ancillary data or option types.
*/
if (opt->ip6po_rthdr == NULL)
newdest = &opt->ip6po_dest1;
else
newdest = &opt->ip6po_dest2;
break;
case IPV6_RTHDRDSTOPTS:
newdest = &opt->ip6po_dest1;
break;
case IPV6_DSTOPTS:
newdest = &opt->ip6po_dest2;
break;
}
/* turn off the previous option, then set the new option. */
ip6_clearpktopts(opt, optname);
*newdest = malloc(destlen, M_IP6OPT, M_NOWAIT);
if (*newdest == NULL)
return (ENOBUFS);
bcopy(dest, *newdest, destlen);
break;
}
case IPV6_2292RTHDR:
case IPV6_RTHDR:
{
struct ip6_rthdr *rth;
int rthlen;
if (len == 0) {
ip6_clearpktopts(opt, IPV6_RTHDR);
break; /* just remove the option */
}
/* message length validation */
if (len < sizeof(struct ip6_rthdr))
return (EINVAL);
rth = (struct ip6_rthdr *)buf;
rthlen = (rth->ip6r_len + 1) << 3;
if (len != rthlen)
return (EINVAL);
switch (rth->ip6r_type) {
case IPV6_RTHDR_TYPE_0:
if (rth->ip6r_len == 0) /* must contain one addr */
return (EINVAL);
if (rth->ip6r_len % 2) /* length must be even */
return (EINVAL);
if (rth->ip6r_len / 2 != rth->ip6r_segleft)
return (EINVAL);
break;
default:
return (EINVAL); /* not supported */
}
/* turn off the previous option */
ip6_clearpktopts(opt, IPV6_RTHDR);
opt->ip6po_rthdr = malloc(rthlen, M_IP6OPT, M_NOWAIT);
if (opt->ip6po_rthdr == NULL)
return (ENOBUFS);
bcopy(rth, opt->ip6po_rthdr, rthlen);
break;
}
case IPV6_USE_MIN_MTU:
if (len != sizeof(int))
return (EINVAL);
minmtupolicy = *(int *)buf;
if (minmtupolicy != IP6PO_MINMTU_MCASTONLY &&
minmtupolicy != IP6PO_MINMTU_DISABLE &&
minmtupolicy != IP6PO_MINMTU_ALL) {
return (EINVAL);
}
opt->ip6po_minmtu = minmtupolicy;
break;
case IPV6_DONTFRAG:
if (len != sizeof(int))
return (EINVAL);
if (uproto == IPPROTO_TCP || *(int *)buf == 0) {
/*
* we ignore this option for TCP sockets.
* (RFC3542 leaves this case unspecified.)
*/
opt->ip6po_flags &= ~IP6PO_DONTFRAG;
} else
opt->ip6po_flags |= IP6PO_DONTFRAG;
break;
default:
return (ENOPROTOOPT);
} /* end of switch */
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 lo0ifp -- 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;
/*
* Duplicate the packet.
*/
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_EMBED(&ip6->ip6_src))
ip6->ip6_src.s6_addr16[1] = 0;
if (IN6_IS_SCOPE_EMBED(&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_MOVE_PKTHDR(mh, m);
MH_ALIGN(mh, sizeof(*ip6));
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(inp)
struct inpcb *inp;
{
int len;
if (!inp->inp_outputopts6)
return 0;
len = 0;
#define elen(x) \
(((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0)
len += elen(inp->inp_outputopts6->ip6po_hbh);
len += elen(inp->inp_outputopts6->ip6po_dest1);
len += elen(inp->inp_outputopts6->ip6po_rthdr);
len += elen(inp->inp_outputopts6->ip6po_dest2);
return len;
#undef elen
}