3366 lines
82 KiB
C
3366 lines
82 KiB
C
/* $NetBSD: ip6_output.c,v 1.235 2024/04/19 00:55:35 riastradh 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 1.235 2024/04/19 00:55:35 riastradh 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/socket.h>
|
|
#include <sys/socketvar.h>
|
|
#include <sys/syslog.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>
|
|
#endif
|
|
|
|
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 inpcb *);
|
|
static int ip6_getmoptions(struct sockopt *, struct inpcb *);
|
|
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 rtentry *, struct ifnet *, u_long *, int *);
|
|
static int copypktopts(struct ip6_pktopts *, struct ip6_pktopts *, int);
|
|
static int ip6_ifaddrvalid(const struct in6_addr *, const struct in6_addr *);
|
|
static int ip6_handle_rthdr(struct ip6_rthdr *, struct ip6_hdr *);
|
|
|
|
#ifdef RFC2292
|
|
static int ip6_pcbopts(struct ip6_pktopts **, struct socket *, struct sockopt *);
|
|
#endif
|
|
|
|
static int
|
|
ip6_handle_rthdr(struct ip6_rthdr *rh, struct ip6_hdr *ip6)
|
|
{
|
|
int error = 0;
|
|
|
|
switch (rh->ip6r_type) {
|
|
case IPV6_RTHDR_TYPE_0:
|
|
/* Dropped, RFC5095. */
|
|
default: /* is it possible? */
|
|
error = EINVAL;
|
|
}
|
|
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Send an IP packet to a host.
|
|
*/
|
|
int
|
|
ip6_if_output(struct ifnet * const ifp, struct ifnet * const origifp,
|
|
struct mbuf * const m, const struct sockaddr_in6 * const dst,
|
|
const struct rtentry *rt)
|
|
{
|
|
int error = 0;
|
|
|
|
if (rt != NULL) {
|
|
error = rt_check_reject_route(rt, ifp);
|
|
if (error != 0) {
|
|
IP6_STATINC(IP6_STAT_RTREJECT);
|
|
m_freem(m);
|
|
return error;
|
|
}
|
|
}
|
|
|
|
/* discard the packet if IPv6 operation is disabled on the interface */
|
|
if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)) {
|
|
m_freem(m);
|
|
return ENETDOWN; /* better error? */
|
|
}
|
|
|
|
if ((ifp->if_flags & IFF_LOOPBACK) != 0)
|
|
error = if_output_lock(ifp, origifp, m, sin6tocsa(dst), rt);
|
|
else
|
|
error = if_output_lock(ifp, ifp, m, sin6tocsa(dst), rt);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* 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 inpcb *inp,
|
|
struct ifnet **ifpp /* XXX: just for statistics */
|
|
)
|
|
{
|
|
struct ip6_hdr *ip6, *mhip6;
|
|
struct ifnet *ifp = NULL, *origifp = NULL;
|
|
struct mbuf *m = m0;
|
|
int tlen, len, off;
|
|
bool tso;
|
|
struct route ip6route;
|
|
struct rtentry *rt = NULL, *rt_pmtu;
|
|
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
|
|
struct psref psref, psref_ia;
|
|
int bound = curlwp_bind();
|
|
bool release_psref_ia = false;
|
|
|
|
#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_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, inp, 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;
|
|
IP6_STATINC(IP6_STAT_IPSECDROP_OUT);
|
|
goto freehdrs;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
if (needipsec &&
|
|
(m->m_pkthdr.csum_flags & (M_CSUM_UDPv6|M_CSUM_TCPv6)) != 0) {
|
|
in6_undefer_cksum_tcpudp(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) {
|
|
IP6_STATINC(IP6_STAT_ODROPPED);
|
|
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) {
|
|
IP6_STATINC(IP6_STAT_ODROPPED);
|
|
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) {
|
|
IP6_STATINC(IP6_STAT_ODROPPED);
|
|
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_SET(m->m_pkthdr.csum_data,
|
|
sizeof(struct ip6_hdr) + optlen);
|
|
}
|
|
|
|
/* Need to save for pmtu */
|
|
finaldst = ip6->ip6_dst;
|
|
|
|
/*
|
|
* 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;
|
|
|
|
rh = mtod(exthdrs.ip6e_rthdr, struct ip6_rthdr *);
|
|
|
|
error = ip6_handle_rthdr(rh, ip6);
|
|
if (error != 0) {
|
|
IP6_STATINC(IP6_STAT_ODROPPED);
|
|
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) {
|
|
memset(&ip6route, 0, sizeof(ip6route));
|
|
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) {
|
|
error = ipsec6_process_packet(m, sp->req, flags);
|
|
|
|
/*
|
|
* 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;
|
|
|
|
goto done;
|
|
}
|
|
#endif
|
|
|
|
/* adjust pointer */
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
|
|
sockaddr_in6_init(&dst_sa, &ip6->ip6_dst, 0, 0, 0);
|
|
|
|
/* We do not need a route for multicast */
|
|
if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
|
|
struct in6_pktinfo *pi = NULL;
|
|
|
|
/*
|
|
* If the outgoing interface for the address is specified by
|
|
* the caller, use it.
|
|
*/
|
|
if (opt && (pi = opt->ip6po_pktinfo) != NULL) {
|
|
/* XXX boundary check is assumed to be already done. */
|
|
ifp = if_get_byindex(pi->ipi6_ifindex, &psref);
|
|
} else if (im6o != NULL) {
|
|
ifp = if_get_byindex(im6o->im6o_multicast_if_index,
|
|
&psref);
|
|
}
|
|
}
|
|
|
|
if (ifp == NULL) {
|
|
error = in6_selectroute(&dst_sa, opt, &ro, &rt, true);
|
|
if (error != 0)
|
|
goto bad;
|
|
ifp = if_get_byindex(rt->rt_ifp->if_index, &psref);
|
|
}
|
|
|
|
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) {
|
|
IP6_STATINC(IP6_STAT_ODROPPED);
|
|
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) {
|
|
origifp = ia->ia_ifp;
|
|
if (if_is_deactivated(origifp)) {
|
|
IP6_STATINC(IP6_STAT_ODROPPED);
|
|
goto bad;
|
|
}
|
|
if_acquire(origifp, &psref_ia);
|
|
release_psref_ia = true;
|
|
} 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. */
|
|
|
|
/* Ensure we only send from a valid address. */
|
|
if ((ifp->if_flags & IFF_LOOPBACK) == 0 &&
|
|
(flags & IPV6_FORWARDING) == 0 &&
|
|
(error = ip6_ifaddrvalid(&src0, &dst0)) != 0)
|
|
{
|
|
char ip6buf[INET6_ADDRSTRLEN];
|
|
nd6log(LOG_ERR,
|
|
"refusing to send from invalid address %s (pid %d)\n",
|
|
IN6_PRINT(ip6buf, &src0), curproc->p_pid);
|
|
IP6_STATINC(IP6_STAT_ODROPPED);
|
|
in6_ifstat_inc(origifp, ifs6_out_discard);
|
|
if (error == 1)
|
|
/*
|
|
* Address exists, but is tentative or detached.
|
|
* We can't send from it because it's invalid,
|
|
* so we drop the packet.
|
|
*/
|
|
error = 0;
|
|
else
|
|
error = EADDRNOTAVAIL;
|
|
goto bad;
|
|
}
|
|
|
|
if (rt != NULL && (rt->rt_flags & RTF_GATEWAY) &&
|
|
!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst))
|
|
dst = satocsin6(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 {
|
|
bool ingroup;
|
|
|
|
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;
|
|
}
|
|
|
|
ingroup = in6_multi_group(&ip6->ip6_dst, ifp);
|
|
if (ingroup && (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 interface to tell the upper layer
|
|
* to increment per-interface statistics.
|
|
*/
|
|
if (ifpp)
|
|
*ifpp = ifp;
|
|
|
|
/* Determine path MTU. */
|
|
/*
|
|
* ro_pmtu represent final destination while
|
|
* ro might represent immediate destination.
|
|
* Use ro_pmtu destination since MTU might differ.
|
|
*/
|
|
if (ro_pmtu != ro) {
|
|
union {
|
|
struct sockaddr dst;
|
|
struct sockaddr_in6 dst6;
|
|
} u;
|
|
|
|
/* ro_pmtu may not have a cache */
|
|
sockaddr_in6_init(&u.dst6, &finaldst, 0, 0, 0);
|
|
rt_pmtu = rtcache_lookup(ro_pmtu, &u.dst);
|
|
} else
|
|
rt_pmtu = rt;
|
|
error = ip6_getpmtu(rt_pmtu, ifp, &mtu, &alwaysfrag);
|
|
if (rt_pmtu != NULL && rt_pmtu != rt)
|
|
rtcache_unref(rt_pmtu, ro_pmtu);
|
|
KASSERT(error == 0); /* ip6_getpmtu never fail if ifp is passed */
|
|
|
|
/*
|
|
* 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.)
|
|
*
|
|
* XXX Is this really necessary?
|
|
*/
|
|
if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
|
|
u_int32_t dummy1 = 0; /* 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;
|
|
goto done;
|
|
}
|
|
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
}
|
|
|
|
/*
|
|
* Run through list of hooks for output packets.
|
|
*/
|
|
error = pfil_run_hooks(inet6_pfil_hook, &m, ifp, PFIL_OUT);
|
|
if (error != 0 || m == NULL) {
|
|
IP6_STATINC(IP6_STAT_PFILDROP_OUT);
|
|
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 */
|
|
IP6_STATINC(IP6_STAT_CANTFRAG);
|
|
error = EMSGSIZE;
|
|
goto bad;
|
|
}
|
|
if (dontfrag && (!tso && tlen > ifp->if_mtu)) { /* 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);
|
|
|
|
IP6_STATINC(IP6_STAT_CANTFRAG);
|
|
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;
|
|
int s;
|
|
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
s = pserialize_read_enter();
|
|
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;
|
|
}
|
|
pserialize_read_exit(s);
|
|
|
|
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_undefer_cksum_tcpudp(m);
|
|
}
|
|
m->m_pkthdr.csum_flags &= ~(M_CSUM_UDPv6|M_CSUM_TCPv6);
|
|
}
|
|
|
|
KASSERT(dst != NULL);
|
|
if (__predict_false(sw_csum & M_CSUM_TSOv6)) {
|
|
/*
|
|
* TSO6 is required by a packet, but disabled for
|
|
* the interface.
|
|
*/
|
|
error = ip6_tso_output(ifp, origifp, m, dst, rt);
|
|
} else
|
|
error = ip6_if_output(ifp, origifp, m, dst, rt);
|
|
goto done;
|
|
}
|
|
|
|
if (tso) {
|
|
IP6_STATINC(IP6_STAT_CANTFRAG); /* XXX */
|
|
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 */
|
|
IP6_STATINC(IP6_STAT_CANTFRAG);
|
|
error = EMSGSIZE;
|
|
in6_ifstat_inc(ifp, ifs6_out_fragfail);
|
|
goto bad;
|
|
} else if (ip6->ip6_plen == 0) {
|
|
/* jumbo payload cannot be fragmented */
|
|
IP6_STATINC(IP6_STAT_CANTFRAG);
|
|
error = EMSGSIZE;
|
|
in6_ifstat_inc(ifp, ifs6_out_fragfail);
|
|
goto bad;
|
|
} else {
|
|
const uint32_t id = ip6_randomid();
|
|
struct mbuf **mnext, *m_frgpart;
|
|
const int hlen = unfragpartlen;
|
|
struct ip6_frag *ip6f;
|
|
u_char nextproto;
|
|
|
|
if (mtu > IPV6_MAXPACKET)
|
|
mtu = IPV6_MAXPACKET;
|
|
|
|
/*
|
|
* Must be able to put at least 8 bytes per fragment.
|
|
*/
|
|
len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7;
|
|
if (len < 8) {
|
|
IP6_STATINC(IP6_STAT_CANTFRAG);
|
|
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_undefer_cksum_tcpudp(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_reset_rcvif(m);
|
|
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 = NULL;
|
|
error = ip6_insertfraghdr(m0, m, hlen, &ip6f);
|
|
if (error) {
|
|
IP6_STATINC(IP6_STAT_ODROPPED);
|
|
goto sendorfree;
|
|
}
|
|
|
|
/* Fill in the Frag6 Header */
|
|
ip6f->ip6f_offlg = htons((u_int16_t)((off - hlen) & ~7));
|
|
if (off + len >= tlen)
|
|
len = tlen - off;
|
|
else
|
|
ip6f->ip6f_offlg |= IP6F_MORE_FRAG;
|
|
ip6f->ip6f_reserved = 0;
|
|
ip6f->ip6f_ident = id;
|
|
ip6f->ip6f_nxt = nextproto;
|
|
|
|
mhip6->ip6_plen = htons((u_int16_t)(len + hlen +
|
|
sizeof(*ip6f) - sizeof(struct ip6_hdr)));
|
|
if ((m_frgpart = m_copym(m0, off, len, M_DONTWAIT)) == NULL) {
|
|
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_reset_rcvif(m);
|
|
IP6_STATINC(IP6_STAT_OFRAGMENTS);
|
|
in6_ifstat_inc(ifp, ifs6_out_fragcreat);
|
|
}
|
|
|
|
in6_ifstat_inc(ifp, ifs6_out_fragok);
|
|
}
|
|
|
|
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;
|
|
int s;
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
s = pserialize_read_enter();
|
|
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;
|
|
}
|
|
pserialize_read_exit(s);
|
|
KASSERT(dst != NULL);
|
|
error = ip6_if_output(ifp, origifp, m, dst, rt);
|
|
} else
|
|
m_freem(m);
|
|
}
|
|
|
|
if (error == 0)
|
|
IP6_STATINC(IP6_STAT_FRAGMENTED);
|
|
|
|
done:
|
|
rtcache_unref(rt, ro);
|
|
if (ro == &ip6route)
|
|
rtcache_free(&ip6route);
|
|
#ifdef IPSEC
|
|
if (sp != NULL)
|
|
KEY_SP_UNREF(&sp);
|
|
#endif
|
|
if_put(ifp, &psref);
|
|
if (release_psref_ia)
|
|
if_put(origifp, &psref_ia);
|
|
curlwp_bindx(bound);
|
|
|
|
return error;
|
|
|
|
freehdrs:
|
|
m_freem(exthdrs.ip6e_hbh);
|
|
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)
|
|
memcpy(mtod(m, void *), hdr, hlen);
|
|
|
|
*mp = m;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* 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 == NULL) {
|
|
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) {
|
|
const int oldoptlen = mopt->m_len;
|
|
struct mbuf *n;
|
|
|
|
/*
|
|
* Assumptions:
|
|
* - exthdrs->ip6e_hbh is not referenced from places
|
|
* other than exthdrs.
|
|
* - exthdrs->ip6e_hbh is not an mbuf chain.
|
|
*/
|
|
KASSERT(mopt->m_next == NULL);
|
|
|
|
/*
|
|
* Give up if the whole (new) hbh header does not fit
|
|
* even in an mbuf cluster.
|
|
*/
|
|
if (oldoptlen + JUMBOOPTLEN > MCLBYTES)
|
|
return ENOBUFS;
|
|
|
|
/*
|
|
* At this point, we must always prepare a cluster.
|
|
*/
|
|
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);
|
|
memcpy(&optbuf[4], &v, 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.
|
|
*
|
|
* On entry, m contains:
|
|
* IPv6 Header
|
|
* On exit, it contains:
|
|
* IPv6 Header -> Unfragmentable Part -> Frag6 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 == NULL)
|
|
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);
|
|
} else {
|
|
/* allocate a new mbuf for the fragment header */
|
|
struct mbuf *mfrg;
|
|
|
|
MGET(mfrg, M_DONTWAIT, MT_DATA);
|
|
if (mfrg == NULL)
|
|
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 rtentry *rt, struct ifnet *ifp, u_long *mtup,
|
|
int *alwaysfragp)
|
|
{
|
|
u_int32_t mtu = 0;
|
|
int alwaysfrag = 0;
|
|
int error = 0;
|
|
|
|
if (rt != NULL) {
|
|
if (ifp == NULL)
|
|
ifp = rt->rt_ifp;
|
|
mtu = rt->rt_rmx.rmx_mtu;
|
|
if (mtu == 0)
|
|
mtu = ifp->if_mtu;
|
|
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 > ifp->if_mtu) {
|
|
/*
|
|
* 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 = ifp->if_mtu;
|
|
if (!(rt->rt_rmx.rmx_locks & RTV_MTU))
|
|
rt->rt_rmx.rmx_mtu = mtu;
|
|
}
|
|
} else if (ifp) {
|
|
mtu = ifp->if_mtu;
|
|
} 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 inpcb *inp = sotoinpcb(so);
|
|
struct ip_moptions **mopts;
|
|
int error, optval;
|
|
int level, optname;
|
|
|
|
KASSERT(solocked(so));
|
|
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 = &inp->inp_moptions;
|
|
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_outputopts(inp), 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:
|
|
case IPV6_BINDANY:
|
|
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_hops6(inp) = optval;
|
|
}
|
|
break;
|
|
#define OPTSET(bit) \
|
|
do { \
|
|
if (optval) \
|
|
inp->inp_flags |= (bit); \
|
|
else \
|
|
inp->inp_flags &= ~(bit); \
|
|
} while (/*CONSTCOND*/ 0)
|
|
|
|
#ifdef RFC2292
|
|
#define OPTSET2292(bit) \
|
|
do { \
|
|
inp->inp_flags |= IN6P_RFC2292; \
|
|
if (optval) \
|
|
inp->inp_flags |= (bit); \
|
|
else \
|
|
inp->inp_flags &= ~(bit); \
|
|
} while (/*CONSTCOND*/ 0)
|
|
#endif
|
|
|
|
#define OPTBIT(bit) (inp->inp_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_outputopts(inp);
|
|
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 (inp->inp_lport ||
|
|
!IN6_IS_ADDR_UNSPECIFIED(&in6p_laddr(inp))) {
|
|
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;
|
|
|
|
case IPV6_BINDANY:
|
|
error = kauth_authorize_network(
|
|
kauth_cred_get(), KAUTH_NETWORK_BIND,
|
|
KAUTH_REQ_NETWORK_BIND_ANYADDR, so, NULL,
|
|
NULL);
|
|
if (error)
|
|
break;
|
|
OPTSET(IN6P_BINDANY);
|
|
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_outputopts(inp);
|
|
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_outputopts(inp);
|
|
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_outputopts(inp);
|
|
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, inp);
|
|
break;
|
|
|
|
case IPV6_PORTRANGE:
|
|
error = sockopt_getint(sopt, &optval);
|
|
if (error)
|
|
break;
|
|
|
|
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 IPV6_PORTALGO:
|
|
error = sockopt_getint(sopt, &optval);
|
|
if (error)
|
|
break;
|
|
|
|
error = portalgo_algo_index_select(inp, optval);
|
|
break;
|
|
|
|
#if defined(IPSEC)
|
|
case IPV6_IPSEC_POLICY:
|
|
if (ipsec_enabled) {
|
|
error = ipsec_set_policy(inp,
|
|
sopt->sopt_data, sopt->sopt_size,
|
|
kauth_cred_get());
|
|
} else
|
|
error = ENOPROTOOPT;
|
|
break;
|
|
#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:
|
|
case IPV6_BINDANY:
|
|
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_hops6(inp);
|
|
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 = 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_BINDANY:
|
|
optval = OPTBIT(IN6P_BINDANY);
|
|
break;
|
|
}
|
|
|
|
if (error)
|
|
break;
|
|
error = sockopt_setint(sopt, optval);
|
|
break;
|
|
|
|
case IPV6_PATHMTU:
|
|
{
|
|
u_long pmtu = 0;
|
|
struct ip6_mtuinfo mtuinfo;
|
|
struct route *ro = &inp->inp_route;
|
|
struct rtentry *rt;
|
|
union {
|
|
struct sockaddr dst;
|
|
struct sockaddr_in6 dst6;
|
|
} u;
|
|
|
|
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.
|
|
*/
|
|
sockaddr_in6_init(&u.dst6, &in6p_faddr(inp), 0, 0, 0);
|
|
rt = rtcache_lookup(ro, &u.dst);
|
|
error = ip6_getpmtu(rt, NULL, &pmtu, NULL);
|
|
rtcache_unref(rt, ro);
|
|
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_outputopts(inp),
|
|
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, inp);
|
|
break;
|
|
|
|
case IPV6_PORTALGO:
|
|
optval = inp->inp_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 = ipsec_get_policy(inp, sopt->sopt_data,
|
|
sopt->sopt_size, &m);
|
|
if (!error)
|
|
error = sockopt_setmbuf(sopt, m);
|
|
} else
|
|
error = ENOPROTOOPT;
|
|
break;
|
|
#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 inpcb *inp = sotoinpcb(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 < -1 ||
|
|
(optval > 0 && (optval % 2) != 0)) {
|
|
/*
|
|
* The API assumes non-negative even offset
|
|
* values or -1 as a special value.
|
|
*/
|
|
error = EINVAL;
|
|
} else if (so->so_proto->pr_protocol ==
|
|
IPPROTO_ICMPV6) {
|
|
if (optval != icmp6off)
|
|
error = EINVAL;
|
|
} else
|
|
in6p_cksum(inp) = optval;
|
|
break;
|
|
|
|
case PRCO_GETOPT:
|
|
if (so->so_proto->pr_protocol == IPPROTO_ICMPV6)
|
|
optval = icmp6off;
|
|
else
|
|
optval = in6p_cksum(inp);
|
|
|
|
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;
|
|
|
|
KASSERT(solocked(so));
|
|
|
|
/* 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,
|
|
struct psref *psref, 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(kauth_cred_get(),
|
|
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;
|
|
rt = rtcache_init(&ro);
|
|
*ifp = rt != NULL ?
|
|
if_get_byindex(rt->rt_ifp->if_index, psref) : NULL;
|
|
rtcache_unref(rt, &ro);
|
|
rtcache_free(&ro);
|
|
} else {
|
|
/*
|
|
* If the interface is specified, validate it.
|
|
*/
|
|
*ifp = if_get_byindex(mreq.ipv6mr_interface, psref);
|
|
if (*ifp == 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 inpcb *inp)
|
|
{
|
|
int error = 0;
|
|
u_int loop, ifindex;
|
|
struct ipv6_mreq mreq;
|
|
struct in6_addr ia;
|
|
struct ifnet *ifp;
|
|
struct ip6_moptions *im6o = in6p_moptions(inp);
|
|
struct in6_multi_mship *imm;
|
|
|
|
KASSERT(inp_locked(inp));
|
|
|
|
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_moptions(inp) = im6o;
|
|
im6o->im6o_multicast_if_index = 0;
|
|
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: {
|
|
int s;
|
|
/*
|
|
* Select the interface for outgoing multicast packets.
|
|
*/
|
|
error = sockopt_get(sopt, &ifindex, sizeof(ifindex));
|
|
if (error != 0)
|
|
break;
|
|
|
|
s = pserialize_read_enter();
|
|
if (ifindex != 0) {
|
|
if ((ifp = if_byindex(ifindex)) == NULL) {
|
|
pserialize_read_exit(s);
|
|
error = ENXIO; /* XXX EINVAL? */
|
|
break;
|
|
}
|
|
if ((ifp->if_flags & IFF_MULTICAST) == 0) {
|
|
pserialize_read_exit(s);
|
|
error = EADDRNOTAVAIL;
|
|
break;
|
|
}
|
|
} else
|
|
ifp = NULL;
|
|
im6o->im6o_multicast_if_index = if_get_index(ifp);
|
|
pserialize_read_exit(s);
|
|
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: {
|
|
int bound;
|
|
struct psref psref;
|
|
/*
|
|
* Add a multicast group membership.
|
|
* Group must be a valid IP6 multicast address.
|
|
*/
|
|
bound = curlwp_bind();
|
|
ifp = NULL;
|
|
error = ip6_get_membership(sopt, &ifp, &psref, &ia, sizeof(ia));
|
|
if (error != 0) {
|
|
KASSERT(ifp == NULL);
|
|
curlwp_bindx(bound);
|
|
return error;
|
|
}
|
|
|
|
if (IN6_IS_ADDR_V4MAPPED(&ia)) {
|
|
error = ip_setmoptions(&inp->inp_moptions, sopt);
|
|
goto put_break;
|
|
}
|
|
/*
|
|
* See if we found an interface, and confirm that it
|
|
* supports multicast
|
|
*/
|
|
if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) {
|
|
error = EADDRNOTAVAIL;
|
|
goto put_break;
|
|
}
|
|
|
|
if (in6_setscope(&ia, ifp, NULL)) {
|
|
error = EADDRNOTAVAIL; /* XXX: should not happen */
|
|
goto put_break;
|
|
}
|
|
|
|
/*
|
|
* 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,
|
|
&ia))
|
|
goto put_break;
|
|
}
|
|
if (imm != NULL) {
|
|
error = EADDRINUSE;
|
|
goto put_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)
|
|
goto put_break;
|
|
LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain);
|
|
put_break:
|
|
if_put(ifp, &psref);
|
|
curlwp_bindx(bound);
|
|
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(&inp->inp_moptions, 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.
|
|
*/
|
|
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);
|
|
/* in6m_ifp should not leave thanks to inp_lock */
|
|
break;
|
|
}
|
|
|
|
default:
|
|
error = EOPNOTSUPP;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* If all options have default values, no need to keep the mbuf.
|
|
*/
|
|
if (im6o->im6o_multicast_if_index == 0 &&
|
|
im6o->im6o_multicast_hlim == ip6_defmcasthlim &&
|
|
im6o->im6o_multicast_loop == IPV6_DEFAULT_MULTICAST_LOOP &&
|
|
LIST_EMPTY(&im6o->im6o_memberships)) {
|
|
free(in6p_moptions(inp), M_IPMOPTS);
|
|
in6p_moptions(inp) = NULL;
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Return the IP6 multicast options in response to user getsockopt().
|
|
*/
|
|
static int
|
|
ip6_getmoptions(struct sockopt *sopt, struct inpcb *inp)
|
|
{
|
|
u_int optval;
|
|
int error;
|
|
struct ip6_moptions *im6o = in6p_moptions(inp);
|
|
|
|
switch (sopt->sopt_name) {
|
|
case IPV6_MULTICAST_IF:
|
|
if (im6o == NULL || im6o->im6o_multicast_if_index == 0)
|
|
optval = 0;
|
|
else
|
|
optval = im6o->im6o_multicast_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, *nimm;
|
|
|
|
if (im6o == NULL)
|
|
return;
|
|
|
|
/* The owner of im6o (inp) should be protected by solock */
|
|
LIST_FOREACH_SAFE(imm, &im6o->im6o_memberships, i6mm_chain, nimm) {
|
|
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 < 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 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) {
|
|
struct ifnet *ifp;
|
|
int s = pserialize_read_enter();
|
|
ifp = if_byindex(pktinfo->ipi6_ifindex);
|
|
if (ifp == NULL) {
|
|
pserialize_read_exit(s);
|
|
return ENXIO;
|
|
}
|
|
pserialize_read_exit(s);
|
|
}
|
|
|
|
/*
|
|
* 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:
|
|
/* Dropped, RFC5095. */
|
|
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_copypacket(m, M_DONTWAIT);
|
|
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 == NULL) {
|
|
m_freem(m);
|
|
return ENOBUFS;
|
|
}
|
|
m_move_pkthdr(mh, m);
|
|
m_align(mh, sizeof(*ip6));
|
|
m->m_len -= sizeof(*ip6);
|
|
m->m_data += sizeof(*ip6);
|
|
mh->m_next = m;
|
|
mh->m_len = sizeof(*ip6);
|
|
memcpy(mtod(mh, void *), (void *)ip6, sizeof(*ip6));
|
|
m = mh;
|
|
}
|
|
exthdrs->ip6e_ip6 = m;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Compute IPv6 extension header length.
|
|
*/
|
|
int
|
|
ip6_optlen(struct inpcb *inp)
|
|
{
|
|
int len;
|
|
|
|
if (!in6p_outputopts(inp))
|
|
return 0;
|
|
|
|
len = 0;
|
|
#define elen(x) \
|
|
(((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0)
|
|
|
|
len += elen(in6p_outputopts(inp)->ip6po_hbh);
|
|
len += elen(in6p_outputopts(inp)->ip6po_dest1);
|
|
len += elen(in6p_outputopts(inp)->ip6po_rthdr);
|
|
len += elen(in6p_outputopts(inp)->ip6po_dest2);
|
|
return len;
|
|
#undef elen
|
|
}
|
|
|
|
/*
|
|
* Ensure sending address is valid.
|
|
* Returns 0 on success, -1 if an error should be sent back or 1
|
|
* if the packet could be dropped without error (protocol dependent).
|
|
*/
|
|
static int
|
|
ip6_ifaddrvalid(const struct in6_addr *src, const struct in6_addr *dst)
|
|
{
|
|
struct sockaddr_in6 sin6;
|
|
int s, error;
|
|
struct ifaddr *ifa;
|
|
struct in6_ifaddr *ia6;
|
|
|
|
if (IN6_IS_ADDR_UNSPECIFIED(src))
|
|
return 0;
|
|
|
|
memset(&sin6, 0, sizeof(sin6));
|
|
sin6.sin6_family = AF_INET6;
|
|
sin6.sin6_len = sizeof(sin6);
|
|
sin6.sin6_addr = *src;
|
|
|
|
s = pserialize_read_enter();
|
|
ifa = ifa_ifwithaddr(sin6tosa(&sin6));
|
|
if ((ia6 = ifatoia6(ifa)) == NULL ||
|
|
ia6->ia6_flags & (IN6_IFF_ANYCAST | IN6_IFF_DUPLICATED))
|
|
error = -1;
|
|
else if (ia6->ia6_flags & IN6_IFF_TENTATIVE)
|
|
error = 1;
|
|
else if (ia6->ia6_flags & IN6_IFF_DETACHED &&
|
|
(sin6.sin6_addr = *dst, ifa_ifwithaddr(sin6tosa(&sin6)) == NULL))
|
|
/* Allow internal traffic to DETACHED addresses */
|
|
error = 1;
|
|
else
|
|
error = 0;
|
|
pserialize_read_exit(s);
|
|
|
|
return error;
|
|
}
|