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NetBSD/sys/netinet6/ip6_output.c
pooka 1c4a50f192 sprinkle _KERNEL_OPT
2015-08-24 22:21:26 +00:00

3232 lines
79 KiB
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/* $NetBSD: ip6_output.c,v 1.166 2015/08/24 22:21:27 pooka 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 1.166 2015/08/24 22:21:27 pooka Exp $");
#ifdef _KERNEL_OPT
#include "opt_inet.h"
#include "opt_inet6.h"
#include "opt_ipsec.h"
#endif
#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 <sys/kauth.h>
#include <net/if.h>
#include <net/route.h>
#include <net/pfil.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/ip6.h>
#include <netinet/ip_var.h>
#include <netinet/icmp6.h>
#include <netinet/in_offload.h>
#include <netinet/portalgo.h>
#include <netinet6/in6_offload.h>
#include <netinet6/ip6_var.h>
#include <netinet6/ip6_private.h>
#include <netinet6/in6_pcb.h>
#include <netinet6/nd6.h>
#include <netinet6/ip6protosw.h>
#include <netinet6/scope6_var.h>
#ifdef IPSEC
#include <netipsec/ipsec.h>
#include <netipsec/ipsec6.h>
#include <netipsec/key.h>
#include <netipsec/xform.h>
#endif
#include <net/net_osdep.h>
extern pfil_head_t *inet6_pfil_hook; /* XXX */
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 **,
kauth_cred_t, int);
static int ip6_getpcbopt(struct ip6_pktopts *, int, struct sockopt *);
static int ip6_setpktopt(int, u_char *, int, struct ip6_pktopts *, kauth_cred_t,
int, int, int);
static int ip6_setmoptions(const struct sockopt *, struct in6pcb *);
static int ip6_getmoptions(struct sockopt *, struct in6pcb *);
static int ip6_copyexthdr(struct mbuf **, void *, 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 *, struct route *, struct ifnet *,
const struct in6_addr *, u_long *, int *);
static int copypktopts(struct ip6_pktopts *, struct ip6_pktopts *, int);
#ifdef RFC2292
static int ip6_pcbopts(struct ip6_pktopts **, struct socket *, struct sockopt *);
#endif
/*
* 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(
struct mbuf *m0,
struct ip6_pktopts *opt,
struct route *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;
bool tso;
struct route ip6route;
struct rtentry *rt = NULL;
const struct sockaddr_in6 *dst;
struct sockaddr_in6 src_sa, dst_sa;
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, src0, dst0;
u_int32_t zone;
struct route *ro_pmtu = NULL;
int hdrsplit = 0;
int needipsec = 0;
#ifdef IPSEC
struct secpolicy *sp = NULL;
#endif
memset(&ip6route, 0, sizeof(ip6route));
#ifdef DIAGNOSTIC
if ((m->m_flags & M_PKTHDR) == 0)
panic("ip6_output: no HDR");
if ((m->m_pkthdr.csum_flags &
(M_CSUM_TCPv4|M_CSUM_UDPv4|M_CSUM_TSOv4)) != 0) {
panic("ip6_output: IPv4 checksum offload flags: %d",
m->m_pkthdr.csum_flags);
}
if ((m->m_pkthdr.csum_flags & (M_CSUM_TCPv6|M_CSUM_UDPv6)) ==
(M_CSUM_TCPv6|M_CSUM_UDPv6)) {
panic("ip6_output: conflicting checksum offload flags: %d",
m->m_pkthdr.csum_flags);
}
#endif
M_CSUM_DATA_IPv6_HL_SET(m->m_pkthdr.csum_data, sizeof(struct ip6_hdr));
#define MAKE_EXTHDR(hp, mp) \
do { \
if (hp) { \
struct ip6_ext *eh = (struct ip6_ext *)(hp); \
error = ip6_copyexthdr((mp), (void *)(hp), \
((eh)->ip6e_len + 1) << 3); \
if (error) \
goto freehdrs; \
} \
} while (/*CONSTCOND*/ 0)
memset(&exthdrs, 0, 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);
}
/*
* 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;
#ifdef IPSEC
if (ipsec_used) {
/* Check the security policy (SP) for the packet */
sp = ipsec6_check_policy(m, so, flags, &needipsec, &error);
if (error != 0) {
/*
* Hack: -EINVAL is used to signal that a packet
* should be silently discarded. This is typically
* because we asked key management for an SA and
* it was delayed (e.g. kicked up to IKE).
*/
if (error == -EINVAL)
error = 0;
goto freehdrs;
}
}
#endif /* IPSEC */
if (needipsec &&
(m->m_pkthdr.csum_flags & (M_CSUM_UDPv6|M_CSUM_TCPv6)) != 0) {
in6_delayed_cksum(m);
m->m_pkthdr.csum_flags &= ~(M_CSUM_UDPv6|M_CSUM_TCPv6);
}
/*
* 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;
optlen += 8; /* XXX JUMBOOPTLEN */
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 (/*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);
M_CSUM_DATA_IPv6_HL_SET(m->m_pkthdr.csum_data,
sizeof(struct ip6_hdr) + optlen);
}
/*
* 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;
struct sockaddr_in6 sa;
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);
/*
* construct a sockaddr_in6 form of
* the first hop.
*
* XXX: we may not have enough
* information about its scope zone;
* there is no standard API to pass
* the information from the
* application.
*/
sockaddr_in6_init(&sa, addr, 0, 0, 0);
if ((error = sa6_embedscope(&sa,
ip6_use_defzone)) != 0) {
goto bad;
}
ip6->ip6_dst = sa.sin6_addr;
(void)memmove(&addr[0], &addr[1],
sizeof(struct in6_addr) *
(rh0->ip6r0_segleft - 1));
addr[rh0->ip6r0_segleft - 1] = finaldst;
/* XXX */
in6_clearscope(addr + rh0->ip6r0_segleft - 1);
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;
IP6_STATINC(IP6_STAT_BADSCOPE);
goto bad;
}
if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) {
error = EOPNOTSUPP;
IP6_STATINC(IP6_STAT_BADSCOPE);
goto bad;
}
IP6_STATINC(IP6_STAT_LOCALOUT);
/*
* Route packet.
*/
/* initialize cached route */
if (ro == NULL) {
ro = &ip6route;
}
ro_pmtu = ro;
if (opt && opt->ip6po_rthdr)
ro = &opt->ip6po_route;
/*
* 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
if (needipsec) {
int s = splsoftnet();
error = ipsec6_process_packet(m, sp->req);
/*
* Preserve KAME behaviour: ENOENT can be returned
* when an SA acquire is in progress. Don't propagate
* this to user-level; it confuses applications.
* XXX this will go away when the SADB is redone.
*/
if (error == ENOENT)
error = 0;
splx(s);
goto done;
}
#endif /* IPSEC */
/* adjust pointer */
ip6 = mtod(m, struct ip6_hdr *);
sockaddr_in6_init(&dst_sa, &ip6->ip6_dst, 0, 0, 0);
if ((error = in6_selectroute(&dst_sa, opt, im6o, ro,
&ifp, &rt, 0)) != 0) {
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.
*/
error = rtcache_setdst(ro, sin6tosa(&dst_sa));
if (error) {
goto bad;
}
}
/*
* then rt (for unicast) and ifp must be non-NULL valid values.
*/
if ((flags & IPV6_FORWARDING) == 0) {
/* XXX: the FORWARDING flag can be set for mrouting. */
in6_ifstat_inc(ifp, ifs6_out_request);
}
if (rt != NULL) {
ia = (struct in6_ifaddr *)(rt->rt_ifa);
rt->rt_use++;
}
/*
* 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;
src0 = ip6->ip6_src;
if (in6_setscope(&src0, origifp, &zone))
goto badscope;
sockaddr_in6_init(&src_sa, &ip6->ip6_src, 0, 0, 0);
if (sa6_recoverscope(&src_sa) || zone != src_sa.sin6_scope_id)
goto badscope;
dst0 = ip6->ip6_dst;
if (in6_setscope(&dst0, origifp, &zone))
goto badscope;
/* re-initialize to be sure */
sockaddr_in6_init(&dst_sa, &ip6->ip6_dst, 0, 0, 0);
if (sa6_recoverscope(&dst_sa) || zone != dst_sa.sin6_scope_id)
goto badscope;
/* scope check is done. */
if (rt == NULL || IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
dst = satocsin6(rtcache_getdst(ro));
KASSERT(dst != NULL);
} else if (opt && rtcache_validate(&opt->ip6po_nextroute) != NULL) {
/*
* 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;
else
dst = satocsin6(rtcache_getdst(ro));
/*
* XXXXXX: original code follows:
*/
if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst))
m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */
else {
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)) {
IP6_STATINC(IP6_STAT_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.
*/
KASSERT(dst != NULL);
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) ||
IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst)) {
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,
&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;
}
}
/*
* clear embedded scope identifiers if necessary.
* in6_clearscope will touch the addresses only when necessary.
*/
in6_clearscope(&ip6->ip6_src);
in6_clearscope(&ip6->ip6_dst);
/*
* 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 (ip6->ip6_nxt == IPV6_HOPOPTS) {
u_int32_t dummy1; /* XXX unused */
u_int32_t dummy2; /* XXX unused */
int hoff = sizeof(struct ip6_hdr);
if (ip6_hopopts_input(&dummy1, &dummy2, &m, &hoff)) {
/* m was already freed at this point */
error = EINVAL;/* better error? */
goto done;
}
ip6 = mtod(m, struct ip6_hdr *);
}
/*
* 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 *);
/*
* 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;
tso = (m->m_pkthdr.csum_flags & M_CSUM_TSOv6) != 0;
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 && (!tso && 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.)
*/
u_int32_t mtu32;
struct ip6ctlparam ip6cp;
mtu32 = (u_int32_t)mtu;
memset(&ip6cp, 0, sizeof(ip6cp));
ip6cp.ip6c_cmdarg = (void *)&mtu32;
pfctlinput2(PRC_MSGSIZE,
rtcache_getdst(ro_pmtu), &ip6cp);
error = EMSGSIZE;
goto bad;
}
/*
* transmit packet without fragmentation
*/
if (dontfrag || (!alwaysfrag && (tlen <= mtu || tso))) {
/* case 1-a and 2-a */
struct in6_ifaddr *ia6;
int sw_csum;
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;
}
sw_csum = m->m_pkthdr.csum_flags & ~ifp->if_csum_flags_tx;
if ((sw_csum & (M_CSUM_UDPv6|M_CSUM_TCPv6)) != 0) {
if (IN6_NEED_CHECKSUM(ifp,
sw_csum & (M_CSUM_UDPv6|M_CSUM_TCPv6))) {
in6_delayed_cksum(m);
}
m->m_pkthdr.csum_flags &= ~(M_CSUM_UDPv6|M_CSUM_TCPv6);
}
KASSERT(dst != NULL);
if (__predict_true(!tso ||
(ifp->if_capenable & IFCAP_TSOv6) != 0)) {
error = nd6_output(ifp, origifp, m, dst, rt);
} else {
error = ip6_tso_output(ifp, origifp, m, dst, rt);
}
goto done;
}
if (tso) {
error = EINVAL; /* XXX */
goto bad;
}
/*
* 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 /* see below */
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
/*
* It is believed this code is a leftover from the
* development of the IPV6_RECVPATHMTU sockopt and
* associated work to implement RFC3542.
* It's not entirely clear what the intent of the API
* is at this point, so disable this code for now.
* The IPV6_RECVPATHMTU sockopt and/or IPV6_DONTFRAG
* will send notifications if the application requests.
*/
/* Notify a proper path MTU to applications. */
mtu32 = (u_int32_t)mtu;
memset(&ip6cp, 0, sizeof(ip6cp));
ip6cp.ip6c_cmdarg = (void *)&mtu32;
pfctlinput2(PRC_MSGSIZE,
rtcache_getdst(ro_pmtu), &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;
}
if ((m->m_pkthdr.csum_flags & (M_CSUM_UDPv6|M_CSUM_TCPv6))
!= 0) {
if (IN6_NEED_CHECKSUM(ifp,
m->m_pkthdr.csum_flags &
(M_CSUM_UDPv6|M_CSUM_TCPv6))) {
in6_delayed_cksum(m);
}
m->m_pkthdr.csum_flags &= ~(M_CSUM_UDPv6|M_CSUM_TCPv6);
}
/*
* 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;
IP6_STATINC(IP6_STAT_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);
/*
* ip6f must be valid if error is 0. But how
* can a compiler be expected to infer this?
*/
ip6f = NULL;
error = ip6_insertfraghdr(m0, m, hlen, &ip6f);
if (error) {
IP6_STATINC(IP6_STAT_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;
IP6_STATINC(IP6_STAT_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 = NULL;
ip6f->ip6f_reserved = 0;
ip6f->ip6f_ident = id;
ip6f->ip6f_nxt = nextproto;
IP6_STATINC(IP6_STAT_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) {
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;
}
KASSERT(dst != NULL);
error = nd6_output(ifp, origifp, m, dst, rt);
} else
m_freem(m);
}
if (error == 0)
IP6_STATINC(IP6_STAT_FRAGMENTED);
done:
rtcache_free(&ip6route);
#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;
badscope:
IP6_STATINC(IP6_STAT_BADSCOPE);
in6_ifstat_inc(origifp, ifs6_out_discard);
if (error == 0)
error = EHOSTUNREACH; /* XXX */
goto bad;
}
static int
ip6_copyexthdr(struct mbuf **mp, void *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, void *), hlen);
*mp = m;
return (0);
}
/*
* Process a delayed payload checksum calculation.
*/
void
in6_delayed_cksum(struct mbuf *m)
{
uint16_t csum, offset;
KASSERT((m->m_pkthdr.csum_flags & (M_CSUM_UDPv6|M_CSUM_TCPv6)) != 0);
KASSERT((~m->m_pkthdr.csum_flags & (M_CSUM_UDPv6|M_CSUM_TCPv6)) != 0);
KASSERT((m->m_pkthdr.csum_flags
& (M_CSUM_UDPv4|M_CSUM_TCPv4|M_CSUM_TSOv4)) == 0);
offset = M_CSUM_DATA_IPv6_HL(m->m_pkthdr.csum_data);
csum = in6_cksum(m, 0, offset, m->m_pkthdr.len - offset);
if (csum == 0 && (m->m_pkthdr.csum_flags & M_CSUM_UDPv6) != 0) {
csum = 0xffff;
}
offset += M_CSUM_DATA_IPv6_OFFSET(m->m_pkthdr.csum_data);
if ((offset + sizeof(csum)) > m->m_len) {
m_copyback(m, offset, sizeof(csum), &csum);
} else {
*(uint16_t *)(mtod(m, char *) + offset) = csum;
}
}
/*
* Insert jumbo payload option.
*/
static int
ip6_insert_jumboopt(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, void *), mtod(n, void *),
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.
*
* *frghdrp will not be read, and it is guaranteed that either an
* error is returned or that *frghdrp will point to space allocated
* for the fragment header.
*/
static int
ip6_insertfraghdr(struct mbuf *m0, struct mbuf *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, char *) +
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(struct route *ro_pmtu, struct route *ro, struct ifnet *ifp,
const struct in6_addr *dst, u_long *mtup, int *alwaysfragp)
{
struct rtentry *rt;
u_int32_t mtu = 0;
int alwaysfrag = 0;
int error = 0;
if (ro_pmtu != ro) {
union {
struct sockaddr dst;
struct sockaddr_in6 dst6;
} u;
/* The first hop and the final destination may differ. */
sockaddr_in6_init(&u.dst6, dst, 0, 0, 0);
rt = rtcache_lookup(ro_pmtu, &u.dst);
} else
rt = rtcache_validate(ro_pmtu);
if (rt != NULL) {
u_int32_t ifmtu;
if (ifp == NULL)
ifp = rt->rt_ifp;
ifmtu = IN6_LINKMTU(ifp);
mtu = 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 (!(rt->rt_rmx.rmx_locks & RTV_MTU))
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(int op, struct socket *so, struct sockopt *sopt)
{
int optdatalen, uproto;
void *optdata;
struct in6pcb *in6p = sotoin6pcb(so);
struct ip_moptions **mopts;
int error, optval;
int level, optname;
KASSERT(sopt != NULL);
level = sopt->sopt_level;
optname = sopt->sopt_name;
error = optval = 0;
uproto = (int)so->so_proto->pr_protocol;
switch (level) {
case IPPROTO_IP:
switch (optname) {
case IP_ADD_MEMBERSHIP:
case IP_DROP_MEMBERSHIP:
case IP_MULTICAST_IF:
case IP_MULTICAST_LOOP:
case IP_MULTICAST_TTL:
mopts = &in6p->in6p_v4moptions;
switch (op) {
case PRCO_GETOPT:
return ip_getmoptions(*mopts, sopt);
case PRCO_SETOPT:
return ip_setmoptions(mopts, sopt);
default:
return EINVAL;
}
default:
return ENOPROTOOPT;
}
case IPPROTO_IPV6:
break;
default:
return ENOPROTOOPT;
}
switch (op) {
case PRCO_SETOPT:
switch (optname) {
#ifdef RFC2292
case IPV6_2292PKTOPTIONS:
error = ip6_pcbopts(&in6p->in6p_outputopts, so, sopt);
break;
#endif
/*
* 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:
error = kauth_authorize_network(kauth_cred_get(),
KAUTH_NETWORK_IPV6, KAUTH_REQ_NETWORK_IPV6_HOPBYHOP,
NULL, NULL, NULL);
if (error)
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:
error = sockopt_getint(sopt, &optval);
if (error)
break;
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)
#ifdef RFC2292
#define OPTSET2292(bit) \
do { \
in6p->in6p_flags |= IN6P_RFC2292; \
if (optval) \
in6p->in6p_flags |= (bit); \
else \
in6p->in6p_flags &= ~(bit); \
} while (/*CONSTCOND*/ 0)
#endif
#define OPTBIT(bit) (in6p->in6p_flags & (bit) ? 1 : 0)
case IPV6_RECVPKTINFO:
#ifdef RFC2292
/* cannot mix with RFC2292 */
if (OPTBIT(IN6P_RFC2292)) {
error = EINVAL;
break;
}
#endif
OPTSET(IN6P_PKTINFO);
break;
case IPV6_HOPLIMIT:
{
struct ip6_pktopts **optp;
#ifdef RFC2292
/* cannot mix with RFC2292 */
if (OPTBIT(IN6P_RFC2292)) {
error = EINVAL;
break;
}
#endif
optp = &in6p->in6p_outputopts;
error = ip6_pcbopt(IPV6_HOPLIMIT,
(u_char *)&optval,
sizeof(optval),
optp,
kauth_cred_get(), uproto);
break;
}
case IPV6_RECVHOPLIMIT:
#ifdef RFC2292
/* cannot mix with RFC2292 */
if (OPTBIT(IN6P_RFC2292)) {
error = EINVAL;
break;
}
#endif
OPTSET(IN6P_HOPLIMIT);
break;
case IPV6_RECVHOPOPTS:
#ifdef RFC2292
/* cannot mix with RFC2292 */
if (OPTBIT(IN6P_RFC2292)) {
error = EINVAL;
break;
}
#endif
OPTSET(IN6P_HOPOPTS);
break;
case IPV6_RECVDSTOPTS:
#ifdef RFC2292
/* cannot mix with RFC2292 */
if (OPTBIT(IN6P_RFC2292)) {
error = EINVAL;
break;
}
#endif
OPTSET(IN6P_DSTOPTS);
break;
case IPV6_RECVRTHDRDSTOPTS:
#ifdef RFC2292
/* cannot mix with RFC2292 */
if (OPTBIT(IN6P_RFC2292)) {
error = EINVAL;
break;
}
#endif
OPTSET(IN6P_RTHDRDSTOPTS);
break;
case IPV6_RECVRTHDR:
#ifdef RFC2292
/* cannot mix with RFC2292 */
if (OPTBIT(IN6P_RFC2292)) {
error = EINVAL;
break;
}
#endif
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 (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;
case IPV6_RECVTCLASS:
#ifdef RFC2292
/* cannot mix with RFC2292 XXX */
if (OPTBIT(IN6P_RFC2292)) {
error = EINVAL;
break;
}
#endif
OPTSET(IN6P_TCLASS);
break;
}
break;
case IPV6_OTCLASS:
{
struct ip6_pktopts **optp;
u_int8_t tclass;
error = sockopt_get(sopt, &tclass, sizeof(tclass));
if (error)
break;
optp = &in6p->in6p_outputopts;
error = ip6_pcbopt(optname,
(u_char *)&tclass,
sizeof(tclass),
optp,
kauth_cred_get(), uproto);
break;
}
case IPV6_TCLASS:
case IPV6_DONTFRAG:
case IPV6_USE_MIN_MTU:
case IPV6_PREFER_TEMPADDR:
error = sockopt_getint(sopt, &optval);
if (error)
break;
{
struct ip6_pktopts **optp;
optp = &in6p->in6p_outputopts;
error = ip6_pcbopt(optname,
(u_char *)&optval,
sizeof(optval),
optp,
kauth_cred_get(), uproto);
break;
}
#ifdef RFC2292
case IPV6_2292PKTINFO:
case IPV6_2292HOPLIMIT:
case IPV6_2292HOPOPTS:
case IPV6_2292DSTOPTS:
case IPV6_2292RTHDR:
/* RFC 2292 */
error = sockopt_getint(sopt, &optval);
if (error)
break;
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.
*/
error =
kauth_authorize_network(kauth_cred_get(),
KAUTH_NETWORK_IPV6,
KAUTH_REQ_NETWORK_IPV6_HOPBYHOP, NULL,
NULL, NULL);
if (error)
return (error);
OPTSET2292(IN6P_HOPOPTS);
break;
case IPV6_2292DSTOPTS:
error =
kauth_authorize_network(kauth_cred_get(),
KAUTH_NETWORK_IPV6,
KAUTH_REQ_NETWORK_IPV6_HOPBYHOP, NULL,
NULL, NULL);
if (error)
return (error);
OPTSET2292(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */
break;
case IPV6_2292RTHDR:
OPTSET2292(IN6P_RTHDR);
break;
}
break;
#endif
case IPV6_PKTINFO:
case IPV6_HOPOPTS:
case IPV6_RTHDR:
case IPV6_DSTOPTS:
case IPV6_RTHDRDSTOPTS:
case IPV6_NEXTHOP: {
/* new advanced API (RFC3542) */
void *optbuf;
int optbuflen;
struct ip6_pktopts **optp;
#ifdef RFC2292
/* cannot mix with RFC2292 */
if (OPTBIT(IN6P_RFC2292)) {
error = EINVAL;
break;
}
#endif
optbuflen = sopt->sopt_size;
optbuf = malloc(optbuflen, M_IP6OPT, M_NOWAIT);
if (optbuf == NULL) {
error = ENOBUFS;
break;
}
error = sockopt_get(sopt, optbuf, optbuflen);
if (error) {
free(optbuf, M_IP6OPT);
break;
}
optp = &in6p->in6p_outputopts;
error = ip6_pcbopt(optname, optbuf, optbuflen,
optp, kauth_cred_get(), uproto);
free(optbuf, M_IP6OPT);
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(sopt, in6p);
break;
case IPV6_PORTRANGE:
error = sockopt_getint(sopt, &optval);
if (error)
break;
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;
case IPV6_PORTALGO:
error = sockopt_getint(sopt, &optval);
if (error)
break;
error = portalgo_algo_index_select(
(struct inpcb_hdr *)in6p, optval);
break;
#if defined(IPSEC)
case IPV6_IPSEC_POLICY:
if (ipsec_enabled) {
error = ipsec6_set_policy(in6p, optname,
sopt->sopt_data, sopt->sopt_size,
kauth_cred_get());
break;
}
/*FALLTHROUGH*/
#endif /* IPSEC */
default:
error = ENOPROTOOPT;
break;
}
break;
case PRCO_GETOPT:
switch (optname) {
#ifdef RFC2292
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.
*/
break;
#endif
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:
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 = in6p->in6p_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 = OPTBIT(IN6P_IPV6_V6ONLY);
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_RECVTCLASS:
optval = OPTBIT(IN6P_TCLASS);
break;
}
if (error)
break;
error = sockopt_setint(sopt, optval);
break;
case IPV6_PATHMTU:
{
u_long pmtu = 0;
struct ip6_mtuinfo mtuinfo;
struct route *ro = &in6p->in6p_route;
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,
&in6p->in6p_faddr, &pmtu, NULL);
if (error)
break;
if (pmtu > IPV6_MAXPACKET)
pmtu = IPV6_MAXPACKET;
memset(&mtuinfo, 0, sizeof(mtuinfo));
mtuinfo.ip6m_mtu = (u_int32_t)pmtu;
optdata = (void *)&mtuinfo;
optdatalen = sizeof(mtuinfo);
if (optdatalen > MCLBYTES)
return (EMSGSIZE); /* XXX */
error = sockopt_set(sopt, optdata, optdatalen);
break;
}
#ifdef RFC2292
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;
}
error = sockopt_setint(sopt, optval);
break;
#endif
case IPV6_PKTINFO:
case IPV6_HOPOPTS:
case IPV6_RTHDR:
case IPV6_DSTOPTS:
case IPV6_RTHDRDSTOPTS:
case IPV6_NEXTHOP:
case IPV6_OTCLASS:
case IPV6_TCLASS:
case IPV6_DONTFRAG:
case IPV6_USE_MIN_MTU:
case IPV6_PREFER_TEMPADDR:
error = ip6_getpcbopt(in6p->in6p_outputopts,
optname, sopt);
break;
case IPV6_MULTICAST_IF:
case IPV6_MULTICAST_HOPS:
case IPV6_MULTICAST_LOOP:
case IPV6_JOIN_GROUP:
case IPV6_LEAVE_GROUP:
error = ip6_getmoptions(sopt, in6p);
break;
case IPV6_PORTALGO:
optval = ((struct inpcb_hdr *)in6p)->inph_portalgo;
error = sockopt_setint(sopt, optval);
break;
#if defined(IPSEC)
case IPV6_IPSEC_POLICY:
if (ipsec_used) {
struct mbuf *m = NULL;
/*
* XXX: this will return EINVAL as sopt is
* empty
*/
error = ipsec6_get_policy(in6p, sopt->sopt_data,
sopt->sopt_size, &m);
if (!error)
error = sockopt_setmbuf(sopt, m);
break;
}
/*FALLTHROUGH*/
#endif /* IPSEC */
default:
error = ENOPROTOOPT;
break;
}
break;
}
return (error);
}
int
ip6_raw_ctloutput(int op, struct socket *so, struct sockopt *sopt)
{
int error = 0, optval;
const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum);
struct in6pcb *in6p = sotoin6pcb(so);
int level, optname;
KASSERT(sopt != NULL);
level = sopt->sopt_level;
optname = sopt->sopt_name;
if (level != IPPROTO_IPV6) {
return ENOPROTOOPT;
}
switch (optname) {
case IPV6_CHECKSUM:
/*
* For ICMPv6 sockets, no modification allowed for checksum
* offset, permit "no change" values to help existing apps.
*
* XXX 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:
error = sockopt_getint(sopt, &optval);
if (error)
break;
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;
error = sockopt_setint(sopt, optval);
break;
default:
error = EINVAL;
break;
}
break;
default:
error = ENOPROTOOPT;
break;
}
return (error);
}
#ifdef RFC2292
/*
* Set up IP6 options in pcb for insertion in output packets or
* specifying behavior of outgoing packets.
*/
static int
ip6_pcbopts(struct ip6_pktopts **pktopt, struct socket *so,
struct sockopt *sopt)
{
struct ip6_pktopts *opt = *pktopt;
struct mbuf *m;
int error = 0;
/* turn off any old options. */
if (opt) {
#ifdef DIAGNOSTIC
if (opt->ip6po_pktinfo || opt->ip6po_nexthop ||
opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 ||
opt->ip6po_rhinfo.ip6po_rhi_rthdr)
printf("ip6_pcbopts: all specified options are cleared.\n");
#endif
ip6_clearpktopts(opt, -1);
} else {
opt = malloc(sizeof(*opt), M_IP6OPT, M_NOWAIT);
if (opt == NULL)
return (ENOBUFS);
}
*pktopt = NULL;
if (sopt == NULL || sopt->sopt_size == 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. */
m = sockopt_getmbuf(sopt);
if (m == NULL) {
free(opt, M_IP6OPT);
return (ENOBUFS);
}
error = ip6_setpktopts(m, opt, NULL, kauth_cred_get(),
so->so_proto->pr_protocol);
m_freem(m);
if (error != 0) {
ip6_clearpktopts(opt, -1); /* XXX: discard all options */
free(opt, M_IP6OPT);
return (error);
}
*pktopt = opt;
return (0);
}
#endif
/*
* initialize ip6_pktopts. beware that there are non-zero default values in
* the struct.
*/
void
ip6_initpktopts(struct ip6_pktopts *opt)
{
memset(opt, 0, 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;
opt->ip6po_prefer_tempaddr = IP6PO_TEMPADDR_SYSTEM;
}
#define sin6tosa(sin6) ((struct sockaddr *)(sin6)) /* XXX */
static int
ip6_pcbopt(int optname, u_char *buf, int len, struct ip6_pktopts **pktopt,
kauth_cred_t cred, int uproto)
{
struct ip6_pktopts *opt;
if (*pktopt == NULL) {
*pktopt = malloc(sizeof(struct ip6_pktopts), M_IP6OPT,
M_NOWAIT);
if (*pktopt == NULL)
return (ENOBUFS);
ip6_initpktopts(*pktopt);
}
opt = *pktopt;
return (ip6_setpktopt(optname, buf, len, opt, cred, 1, 0, uproto));
}
static int
ip6_getpcbopt(struct ip6_pktopts *pktopt, int optname, struct sockopt *sopt)
{
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;
int defpreftemp = IP6PO_TEMPADDR_SYSTEM;
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... */
memset(&null_pktinfo, 0, sizeof(null_pktinfo));
optdata = (void *)&null_pktinfo;
}
optdatalen = sizeof(struct in6_pktinfo);
break;
case IPV6_OTCLASS:
/* XXX */
return (EINVAL);
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;
case IPV6_PREFER_TEMPADDR:
if (pktopt)
optdata = (void *)&pktopt->ip6po_prefer_tempaddr;
else
optdata = (void *)&defpreftemp;
optdatalen = sizeof(int);
break;
default: /* should not happen */
#ifdef DIAGNOSTIC
panic("ip6_getpcbopt: unexpected option\n");
#endif
return (ENOPROTOOPT);
}
error = sockopt_set(sopt, optdata, optdatalen);
return (error);
}
void
ip6_clearpktopts(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) {
rtcache_free(&pktopt->ip6po_nextroute);
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;
rtcache_free(&pktopt->ip6po_route);
}
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) \
goto bad; \
memcpy(dst->type, src->type, hlen); \
} \
} while (/*CONSTCOND*/ 0)
static int
copypktopts(struct ip6_pktopts *dst, struct ip6_pktopts *src, int canwait)
{
dst->ip6po_hlim = src->ip6po_hlim;
dst->ip6po_tclass = src->ip6po_tclass;
dst->ip6po_flags = src->ip6po_flags;
dst->ip6po_minmtu = src->ip6po_minmtu;
dst->ip6po_prefer_tempaddr = src->ip6po_prefer_tempaddr;
if (src->ip6po_pktinfo) {
dst->ip6po_pktinfo = malloc(sizeof(*dst->ip6po_pktinfo),
M_IP6OPT, canwait);
if (dst->ip6po_pktinfo == NULL)
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)
goto bad;
memcpy(dst->ip6po_nexthop, src->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(struct ip6_pktopts *src, int canwait)
{
int error;
struct ip6_pktopts *dst;
dst = malloc(sizeof(*dst), M_IP6OPT, canwait);
if (dst == NULL)
return (NULL);
ip6_initpktopts(dst);
if ((error = copypktopts(dst, src, canwait)) != 0) {
free(dst, M_IP6OPT);
return (NULL);
}
return (dst);
}
void
ip6_freepcbopts(struct ip6_pktopts *pktopt)
{
if (pktopt == NULL)
return;
ip6_clearpktopts(pktopt, -1);
free(pktopt, M_IP6OPT);
}
int
ip6_get_membership(const struct sockopt *sopt, struct ifnet **ifp, void *v,
size_t l)
{
struct ipv6_mreq mreq;
int error;
struct in6_addr *ia = &mreq.ipv6mr_multiaddr;
struct in_addr *ia4 = (void *)&ia->s6_addr32[3];
error = sockopt_get(sopt, &mreq, sizeof(mreq));
if (error != 0)
return error;
if (IN6_IS_ADDR_UNSPECIFIED(ia)) {
/*
* We use the unspecified address to specify to accept
* all multicast addresses. Only super user is allowed
* to do this.
*/
if (kauth_authorize_network(curlwp->l_cred, KAUTH_NETWORK_IPV6,
KAUTH_REQ_NETWORK_IPV6_JOIN_MULTICAST, NULL, NULL, NULL))
return EACCES;
} else if (IN6_IS_ADDR_V4MAPPED(ia)) {
// Don't bother if we are not going to use ifp.
if (l == sizeof(*ia)) {
memcpy(v, ia, l);
return 0;
}
} else if (!IN6_IS_ADDR_MULTICAST(ia)) {
return EINVAL;
}
/*
* If no interface was explicitly specified, choose an
* appropriate one according to the given multicast address.
*/
if (mreq.ipv6mr_interface == 0) {
struct rtentry *rt;
union {
struct sockaddr dst;
struct sockaddr_in dst4;
struct sockaddr_in6 dst6;
} u;
struct route ro;
/*
* Look up the routing table for the
* address, and choose the outgoing interface.
* XXX: is it a good approach?
*/
memset(&ro, 0, sizeof(ro));
if (IN6_IS_ADDR_V4MAPPED(ia))
sockaddr_in_init(&u.dst4, ia4, 0);
else
sockaddr_in6_init(&u.dst6, ia, 0, 0, 0);
error = rtcache_setdst(&ro, &u.dst);
if (error != 0)
return error;
*ifp = (rt = rtcache_init(&ro)) != NULL ? rt->rt_ifp : NULL;
rtcache_free(&ro);
} else {
/*
* If the interface is specified, validate it.
*/
if ((*ifp = if_byindex(mreq.ipv6mr_interface)) == NULL)
return ENXIO; /* XXX EINVAL? */
}
if (sizeof(*ia) == l)
memcpy(v, ia, l);
else
memcpy(v, ia4, l);
return 0;
}
/*
* Set the IP6 multicast options in response to user setsockopt().
*/
static int
ip6_setmoptions(const struct sockopt *sopt, struct in6pcb *in6p)
{
int error = 0;
u_int loop, ifindex;
struct ipv6_mreq mreq;
struct in6_addr ia;
struct ifnet *ifp;
struct ip6_moptions *im6o = in6p->in6p_moptions;
struct in6_multi_mship *imm;
if (im6o == NULL) {
/*
* No multicast option buffer attached to the pcb;
* allocate one and initialize to default values.
*/
im6o = malloc(sizeof(*im6o), M_IPMOPTS, M_NOWAIT);
if (im6o == NULL)
return (ENOBUFS);
in6p->in6p_moptions = 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 (sopt->sopt_name) {
case IPV6_MULTICAST_IF:
/*
* Select the interface for outgoing multicast packets.
*/
error = sockopt_get(sopt, &ifindex, sizeof(ifindex));
if (error != 0)
break;
if (ifindex != 0) {
if ((ifp = if_byindex(ifindex)) == NULL) {
error = ENXIO; /* XXX EINVAL? */
break;
}
if ((ifp->if_flags & IFF_MULTICAST) == 0) {
error = EADDRNOTAVAIL;
break;
}
} else
ifp = NULL;
im6o->im6o_multicast_ifp = ifp;
break;
case IPV6_MULTICAST_HOPS:
{
/*
* Set the IP6 hoplimit for outgoing multicast packets.
*/
int optval;
error = sockopt_getint(sopt, &optval);
if (error != 0)
break;
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.
*/
error = sockopt_get(sopt, &loop, sizeof(loop));
if (error != 0)
break;
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 ((error = ip6_get_membership(sopt, &ifp, &ia, sizeof(ia))))
return error;
if (IN6_IS_ADDR_V4MAPPED(&ia)) {
error = ip_setmoptions(&in6p->in6p_v4moptions, sopt);
break;
}
/*
* See if we found an interface, and confirm that it
* supports multicast
*/
if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) {
error = EADDRNOTAVAIL;
break;
}
if (in6_setscope(&ia, ifp, NULL)) {
error = EADDRNOTAVAIL; /* XXX: should not happen */
break;
}
/*
* 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,
&ia))
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, &ia, &error, 0);
if (imm == NULL)
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.
*/
error = sockopt_get(sopt, &mreq, sizeof(mreq));
if (error != 0)
break;
if (IN6_IS_ADDR_V4MAPPED(&mreq.ipv6mr_multiaddr)) {
error = ip_setmoptions(&in6p->in6p_v4moptions, sopt);
break;
}
/*
* If an interface address was specified, get a pointer
* to its ifnet structure.
*/
if (mreq.ipv6mr_interface != 0) {
if ((ifp = if_byindex(mreq.ipv6mr_interface)) == NULL) {
error = ENXIO; /* XXX EINVAL? */
break;
}
} else
ifp = NULL;
/* Fill in the scope zone ID */
if (ifp) {
if (in6_setscope(&mreq.ipv6mr_multiaddr, ifp, NULL)) {
/* XXX: should not happen */
error = EADDRNOTAVAIL;
break;
}
} else if (mreq.ipv6mr_interface != 0) {
/*
* XXX: This case would happens when the (positive)
* index is in the valid range, but the corresponding
* interface has been detached dynamically. The above
* check probably avoids such case to happen here, but
* we check it explicitly for safety.
*/
error = EADDRNOTAVAIL;
break;
} else { /* ipv6mr_interface == 0 */
struct sockaddr_in6 sa6_mc;
/*
* The API spec says as follows:
* If the interface index is specified as 0, the
* system may choose a multicast group membership to
* drop by matching the multicast address only.
* On the other hand, we cannot disambiguate the scope
* zone unless an interface is provided. Thus, we
* check if there's ambiguity with the default scope
* zone as the last resort.
*/
sockaddr_in6_init(&sa6_mc, &mreq.ipv6mr_multiaddr,
0, 0, 0);
error = sa6_embedscope(&sa6_mc, ip6_use_defzone);
if (error != 0)
break;
mreq.ipv6mr_multiaddr = sa6_mc.sin6_addr;
}
/*
* 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(in6p->in6p_moptions, M_IPMOPTS);
in6p->in6p_moptions = NULL;
}
return (error);
}
/*
* Return the IP6 multicast options in response to user getsockopt().
*/
static int
ip6_getmoptions(struct sockopt *sopt, struct in6pcb *in6p)
{
u_int optval;
int error;
struct ip6_moptions *im6o = in6p->in6p_moptions;
switch (sopt->sopt_name) {
case IPV6_MULTICAST_IF:
if (im6o == NULL || im6o->im6o_multicast_ifp == NULL)
optval = 0;
else
optval = im6o->im6o_multicast_ifp->if_index;
error = sockopt_set(sopt, &optval, sizeof(optval));
break;
case IPV6_MULTICAST_HOPS:
if (im6o == NULL)
optval = ip6_defmcasthlim;
else
optval = im6o->im6o_multicast_hlim;
error = sockopt_set(sopt, &optval, sizeof(optval));
break;
case IPV6_MULTICAST_LOOP:
if (im6o == NULL)
optval = IPV6_DEFAULT_MULTICAST_LOOP;
else
optval = im6o->im6o_multicast_loop;
error = sockopt_set(sopt, &optval, sizeof(optval));
break;
default:
error = EOPNOTSUPP;
}
return (error);
}
/*
* Discard the IP6 multicast options.
*/
void
ip6_freemoptions(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_setpktopts(struct mbuf *control, struct ip6_pktopts *opt,
struct ip6_pktopts *stickyopt, kauth_cred_t cred, int 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);
/* XXX if cm->cmsg_len is not aligned, control->m_len can become <0 */
for (; control->m_len > 0; 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, cred, 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(int optname, u_char *buf, int len, struct ip6_pktopts *opt,
kauth_cred_t cred, int sticky, int cmsg, int uproto)
{
int minmtupolicy;
int error;
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_OTCLASS:
case IPV6_TCLASS:
case IPV6_PREFER_TEMPADDR: /* XXX not an RFC3542 option */
return (ENOPROTOOPT);
}
}
switch (optname) {
#ifdef RFC2292
case IPV6_2292PKTINFO:
#endif
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) {
ifp = if_byindex(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);
}
memcpy(opt->ip6po_pktinfo, pktinfo, sizeof(*pktinfo));
break;
}
#ifdef RFC2292
case IPV6_2292HOPLIMIT:
#endif
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_OTCLASS:
if (len != sizeof(u_int8_t))
return (EINVAL);
opt->ip6po_tclass = *(u_int8_t *)buf;
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;
}
#ifdef RFC2292
case IPV6_2292NEXTHOP:
#endif
case IPV6_NEXTHOP:
error = kauth_authorize_network(cred, KAUTH_NETWORK_IPV6,
KAUTH_REQ_NETWORK_IPV6_HOPBYHOP, NULL, NULL, NULL);
if (error)
return (error);
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 ((error = sa6_embedscope(sa6, ip6_use_defzone))
!= 0) {
return (error);
}
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);
memcpy(opt->ip6po_nexthop, buf, *buf);
break;
#ifdef RFC2292
case IPV6_2292HOPOPTS:
#endif
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.
*/
error = kauth_authorize_network(cred, KAUTH_NETWORK_IPV6,
KAUTH_REQ_NETWORK_IPV6_HOPBYHOP, NULL, NULL, NULL);
if (error)
return (error);
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);
memcpy(opt->ip6po_hbh, hbh, hbhlen);
break;
}
#ifdef RFC2292
case IPV6_2292DSTOPTS:
#endif
case IPV6_DSTOPTS:
case IPV6_RTHDRDSTOPTS:
{
struct ip6_dest *dest, **newdest = NULL;
int destlen;
/* XXX: see the comment for IPV6_HOPOPTS */
error = kauth_authorize_network(cred, KAUTH_NETWORK_IPV6,
KAUTH_REQ_NETWORK_IPV6_HOPBYHOP, NULL, NULL, NULL);
if (error)
return (error);
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);
memcpy(*newdest, dest, destlen);
break;
}
#ifdef RFC2292
case IPV6_2292RTHDR:
#endif
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);
memcpy(opt->ip6po_rthdr, rth, 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;
case IPV6_PREFER_TEMPADDR:
{
int preftemp;
if (len != sizeof(int))
return (EINVAL);
preftemp = *(int *)buf;
switch (preftemp) {
case IP6PO_TEMPADDR_SYSTEM:
case IP6PO_TEMPADDR_NOTPREFER:
case IP6PO_TEMPADDR_PREFER:
break;
default:
return (EINVAL);
}
opt->ip6po_prefer_tempaddr = preftemp;
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(struct ifnet *ifp, struct mbuf *m,
const 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 *);
/*
* clear embedded scope identifiers if necessary.
* in6_clearscope will touch the addresses only when necessary.
*/
in6_clearscope(&ip6->ip6_src);
in6_clearscope(&ip6->ip6_dst);
(void)looutput(ifp, copym, (const struct sockaddr *)dst, NULL);
}
/*
* Chop IPv6 header off from the payload.
*/
static int
ip6_splithdr(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((void *)ip6, mtod(m, void *), sizeof(*ip6));
}
exthdrs->ip6e_ip6 = m;
return 0;
}
/*
* Compute IPv6 extension header length.
*/
int
ip6_optlen(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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