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NetBSD/sys/netinet6/icmp6.c

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/* $NetBSD: icmp6.c,v 1.254 2022/10/28 05:25:36 ozaki-r Exp $ */
/* $KAME: icmp6.c,v 1.217 2001/06/20 15:03:29 jinmei Exp $ */
/*
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* Copyright (c) 1982, 1986, 1988, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. 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_icmp.c 8.2 (Berkeley) 1/4/94
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: icmp6.c,v 1.254 2022/10/28 05:25:36 ozaki-r Exp $");
#ifdef _KERNEL_OPT
#include "opt_compat_netbsd.h"
#include "opt_inet.h"
#include "opt_ipsec.h"
#endif
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kmem.h>
#include <sys/mbuf.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/time.h>
#include <sys/kernel.h>
#include <sys/syslog.h>
#include <sys/domain.h>
#include <sys/sysctl.h>
#include <net/if.h>
#include <net/route.h>
#include <net/if_dl.h>
#include <net/if_types.h>
#include <net/nd.h>
#include <netinet/in.h>
#include <netinet/in_pcb.h>
#include <netinet/in_var.h>
#include <netinet/ip6.h>
#include <netinet/wqinput.h>
#include <netinet6/ip6_var.h>
#include <netinet6/ip6_private.h>
#include <netinet/icmp6.h>
#include <netinet6/icmp6_private.h>
#include <netinet6/mld6_var.h>
#include <netinet6/in6_pcb.h>
#include <netinet6/in6_ifattach.h>
#include <netinet6/ip6protosw.h>
#include <netinet6/nd6.h>
#include <netinet6/scope6_var.h>
#ifdef IPSEC
#include <netipsec/ipsec.h>
#include <netipsec/ipsec6.h>
#include <netipsec/key.h>
#endif
#include "faith.h"
#if defined(NFAITH) && 0 < NFAITH
#include <net/if_faith.h>
#endif
/* Ensure that non packed structures are the desired size. */
__CTASSERT(sizeof(struct icmp6_hdr) == 8);
__CTASSERT(sizeof(struct icmp6_nodeinfo) == 16);
__CTASSERT(sizeof(struct icmp6_namelookup) == 20);
__CTASSERT(sizeof(struct icmp6_router_renum) == 16);
__CTASSERT(sizeof(struct nd_router_solicit) == 8);
__CTASSERT(sizeof(struct nd_router_advert) == 16);
__CTASSERT(sizeof(struct nd_neighbor_solicit) == 24);
__CTASSERT(sizeof(struct nd_neighbor_advert) == 24);
__CTASSERT(sizeof(struct nd_redirect) == 40);
__CTASSERT(sizeof(struct nd_opt_hdr) == 2);
__CTASSERT(sizeof(struct nd_opt_route_info) == 8);
__CTASSERT(sizeof(struct nd_opt_prefix_info) == 32);
__CTASSERT(sizeof(struct nd_opt_rd_hdr) == 8);
__CTASSERT(sizeof(struct nd_opt_mtu) == 8);
__CTASSERT(sizeof(struct nd_opt_nonce) == 2 + ND_OPT_NONCE_LEN);
__CTASSERT(sizeof(struct nd_opt_rdnss) == 8);
__CTASSERT(sizeof(struct nd_opt_dnssl) == 8);
__CTASSERT(sizeof(struct mld_hdr) == 24);
__CTASSERT(sizeof(struct ni_reply_fqdn) == 8);
__CTASSERT(sizeof(struct rr_pco_match) == 24);
__CTASSERT(sizeof(struct rr_pco_use) == 32);
__CTASSERT(sizeof(struct rr_result) == 24);
extern struct domain inet6domain;
percpu_t *icmp6stat_percpu;
extern struct inpcbtable raw6cbtable;
extern int icmp6errppslim;
static int icmp6errpps_count = 0;
static struct timeval icmp6errppslim_last;
extern int icmp6_nodeinfo;
bool icmp6_dynamic_rt_msg = false;
/*
* List of callbacks to notify when Path MTU changes are made.
*/
struct icmp6_mtudisc_callback {
LIST_ENTRY(icmp6_mtudisc_callback) mc_list;
void (*mc_func)(struct in6_addr *);
};
LIST_HEAD(, icmp6_mtudisc_callback) icmp6_mtudisc_callbacks =
LIST_HEAD_INITIALIZER(&icmp6_mtudisc_callbacks);
static struct rttimer_queue *icmp6_mtudisc_timeout_q = NULL;
extern int pmtu_expire;
/* XXX do these values make any sense? */
static int icmp6_mtudisc_hiwat = 1280;
static int icmp6_mtudisc_lowat = 256;
/*
* keep track of # of redirect routes.
*/
static struct rttimer_queue *icmp6_redirect_timeout_q = NULL;
/* XXX experimental, turned off */
static int icmp6_redirect_hiwat = -1;
static int icmp6_redirect_lowat = -1;
/* Protect mtudisc and redirect stuffs */
static kmutex_t icmp6_mtx __cacheline_aligned;
static bool icmp6_reflect_pmtu = false;
static void icmp6_errcount(u_int, int, int);
static int icmp6_rip6_input(struct mbuf **, int);
static void icmp6_reflect(struct mbuf *, size_t);
static int icmp6_ratelimit(const struct in6_addr *, const int, const int);
static const char *icmp6_redirect_diag(char *, size_t, struct in6_addr *,
struct in6_addr *, struct in6_addr *);
static void icmp6_redirect_input(struct mbuf *, int);
static struct mbuf *ni6_input(struct mbuf *, int);
static struct mbuf *ni6_nametodns(const char *, int, int);
static int ni6_dnsmatch(const char *, int, const char *, int);
static int ni6_addrs(struct icmp6_nodeinfo *, struct ifnet **, char *,
struct psref *);
static int ni6_store_addrs(struct icmp6_nodeinfo *, struct icmp6_nodeinfo *,
struct ifnet *, int);
static int icmp6_notify_error(struct mbuf *, int, int, int);
static struct rtentry *icmp6_mtudisc_clone(struct sockaddr *);
static void icmp6_mtudisc_timeout(struct rtentry *, struct rttimer *);
static void icmp6_redirect_timeout(struct rtentry *, struct rttimer *);
static void sysctl_net_inet6_icmp6_setup(struct sysctllog **);
/* workqueue-based pr_input */
static struct wqinput *icmp6_wqinput;
static void _icmp6_input(struct mbuf *m, int off, int proto);
void
icmp6_init(void)
{
sysctl_net_inet6_icmp6_setup(NULL);
mld_init();
mutex_init(&icmp6_mtx, MUTEX_DEFAULT, IPL_NONE);
mutex_enter(&icmp6_mtx);
icmp6_mtudisc_timeout_q = rt_timer_queue_create(pmtu_expire);
icmp6_redirect_timeout_q = rt_timer_queue_create(icmp6_redirtimeout);
mutex_exit(&icmp6_mtx);
icmp6stat_percpu = percpu_alloc(sizeof(uint64_t) * ICMP6_NSTATS);
icmp6_wqinput = wqinput_create("icmp6", _icmp6_input);
}
static void
icmp6_errcount(u_int base, int type, int code)
{
switch (type) {
case ICMP6_DST_UNREACH:
switch (code) {
case ICMP6_DST_UNREACH_NOROUTE:
ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_NOROUTE);
return;
case ICMP6_DST_UNREACH_ADMIN:
ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_ADMIN);
return;
case ICMP6_DST_UNREACH_BEYONDSCOPE:
ICMP6_STATINC(base +
ICMP6_ERRSTAT_DST_UNREACH_BEYONDSCOPE);
return;
case ICMP6_DST_UNREACH_ADDR:
ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_ADDR);
return;
case ICMP6_DST_UNREACH_NOPORT:
ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_NOPORT);
return;
}
break;
case ICMP6_PACKET_TOO_BIG:
ICMP6_STATINC(base + ICMP6_ERRSTAT_PACKET_TOO_BIG);
return;
case ICMP6_TIME_EXCEEDED:
switch (code) {
case ICMP6_TIME_EXCEED_TRANSIT:
ICMP6_STATINC(base + ICMP6_ERRSTAT_TIME_EXCEED_TRANSIT);
return;
case ICMP6_TIME_EXCEED_REASSEMBLY:
ICMP6_STATINC(base +
ICMP6_ERRSTAT_TIME_EXCEED_REASSEMBLY);
return;
}
break;
case ICMP6_PARAM_PROB:
switch (code) {
case ICMP6_PARAMPROB_HEADER:
ICMP6_STATINC(base + ICMP6_ERRSTAT_PARAMPROB_HEADER);
return;
case ICMP6_PARAMPROB_NEXTHEADER:
ICMP6_STATINC(base +
ICMP6_ERRSTAT_PARAMPROB_NEXTHEADER);
return;
case ICMP6_PARAMPROB_OPTION:
ICMP6_STATINC(base + ICMP6_ERRSTAT_PARAMPROB_OPTION);
return;
}
break;
case ND_REDIRECT:
ICMP6_STATINC(base + ICMP6_ERRSTAT_REDIRECT);
return;
}
ICMP6_STATINC(base + ICMP6_ERRSTAT_UNKNOWN);
}
/*
* Register a Path MTU Discovery callback.
*/
void
icmp6_mtudisc_callback_register(void (*func)(struct in6_addr *))
{
struct icmp6_mtudisc_callback *mc, *new;
new = kmem_alloc(sizeof(*mc), KM_SLEEP);
mutex_enter(&icmp6_mtx);
for (mc = LIST_FIRST(&icmp6_mtudisc_callbacks); mc != NULL;
mc = LIST_NEXT(mc, mc_list)) {
if (mc->mc_func == func) {
mutex_exit(&icmp6_mtx);
kmem_free(new, sizeof(*mc));
return;
}
}
new->mc_func = func;
LIST_INSERT_HEAD(&icmp6_mtudisc_callbacks, new, mc_list);
mutex_exit(&icmp6_mtx);
}
/*
* A wrapper function for icmp6_error() necessary when the erroneous packet
* may not contain enough scope zone information.
*/
void
icmp6_error2(struct mbuf *m, int type, int code, int param,
struct ifnet *ifp, struct in6_addr *src)
{
struct ip6_hdr *ip6;
KASSERT(ifp != NULL);
if (m->m_len < sizeof(struct ip6_hdr)) {
m = m_pullup(m, sizeof(struct ip6_hdr));
if (m == NULL)
return;
}
ip6 = mtod(m, struct ip6_hdr *);
if (in6_setscope(&ip6->ip6_src, ifp, NULL) != 0)
goto out;
if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0)
goto out;
*src = ip6->ip6_src;
icmp6_error(m, type, code, param);
return;
out:
m_freem(m);
}
/*
* Generate an error packet of type error in response to bad IP6 packet.
*/
void
icmp6_error(struct mbuf *m, int type, int code, int param)
{
struct ip6_hdr *oip6, *nip6;
struct icmp6_hdr *icmp6;
u_int preplen;
int off;
int nxt;
ICMP6_STATINC(ICMP6_STAT_ERROR);
/* count per-type-code statistics */
icmp6_errcount(ICMP6_STAT_OUTERRHIST, type, code);
if (m->m_flags & M_DECRYPTED) {
ICMP6_STATINC(ICMP6_STAT_CANTERROR);
goto freeit;
}
if (M_UNWRITABLE(m, sizeof(struct ip6_hdr)) &&
(m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL)
return;
oip6 = mtod(m, struct ip6_hdr *);
/*
* If the destination address of the erroneous packet is a multicast
* address, or the packet was sent using link-layer multicast,
* we should basically suppress sending an error (RFC 2463, Section
* 2.4).
* We have two exceptions (the item e.2 in that section):
* - the Packet Too Big message can be sent for path MTU discovery.
* - the Parameter Problem Message that can be allowed an icmp6 error
* in the option type field. This check has been done in
* ip6_unknown_opt(), so we can just check the type and code.
*/
if ((m->m_flags & (M_BCAST|M_MCAST) ||
IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) &&
(type != ICMP6_PACKET_TOO_BIG &&
(type != ICMP6_PARAM_PROB ||
code != ICMP6_PARAMPROB_OPTION)))
goto freeit;
/*
* RFC 2463, 2.4 (e.5): source address check.
* XXX: the case of anycast source?
*/
if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) ||
IN6_IS_ADDR_MULTICAST(&oip6->ip6_src))
goto freeit;
/*
* If we are about to send ICMPv6 against ICMPv6 error/redirect,
* don't do it.
*/
nxt = -1;
off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt);
if (off >= 0 && nxt == IPPROTO_ICMPV6) {
struct icmp6_hdr *icp;
IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off,
sizeof(*icp));
if (icp == NULL) {
ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
return;
}
if (icp->icmp6_type < ICMP6_ECHO_REQUEST ||
icp->icmp6_type == ND_REDIRECT) {
/*
* ICMPv6 error
* Special case: for redirect (which is
* informational) we must not send icmp6 error.
*/
ICMP6_STATINC(ICMP6_STAT_CANTERROR);
goto freeit;
} else {
/* ICMPv6 informational - send the error */
}
} else {
/* non-ICMPv6 - send the error */
}
oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */
/* Finally, do rate limitation check. */
if (icmp6_ratelimit(&oip6->ip6_src, type, code)) {
ICMP6_STATINC(ICMP6_STAT_TOOFREQ);
goto freeit;
}
/*
* OK, ICMP6 can be generated.
*/
if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN)
m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len);
preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
M_PREPEND(m, preplen, M_DONTWAIT);
if (m && M_UNWRITABLE(m, preplen))
m = m_pullup(m, preplen);
if (m == NULL) {
nd6log(LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__);
return;
}
nip6 = mtod(m, struct ip6_hdr *);
nip6->ip6_src = oip6->ip6_src;
nip6->ip6_dst = oip6->ip6_dst;
in6_clearscope(&oip6->ip6_src);
in6_clearscope(&oip6->ip6_dst);
icmp6 = (struct icmp6_hdr *)(nip6 + 1);
icmp6->icmp6_type = type;
icmp6->icmp6_code = code;
icmp6->icmp6_pptr = htonl((u_int32_t)param);
/*
* icmp6_reflect() is designed to be in the input path.
* icmp6_error() can be called from both input and output path,
* and if we are in output path rcvif could contain bogus value.
* clear m->m_pkthdr.rcvif for safety, we should have enough scope
* information in ip header (nip6).
*/
m_reset_rcvif(m);
ICMP6_STATINC(ICMP6_STAT_OUTHIST + type);
/* header order: IPv6 - ICMPv6 */
icmp6_reflect(m, sizeof(struct ip6_hdr));
return;
freeit:
/*
* If we can't tell whether or not we can generate ICMP6, free it.
*/
m_freem(m);
}
/*
* Process a received ICMP6 message.
*/
static void
_icmp6_input(struct mbuf *m, int off, int proto)
{
struct mbuf *n;
struct ip6_hdr *ip6, *nip6;
struct icmp6_hdr *icmp6, *nicmp6;
int icmp6len = m->m_pkthdr.len - off;
int code, sum;
struct ifnet *rcvif;
struct psref psref;
char ip6buf[INET6_ADDRSTRLEN], ip6buf2[INET6_ADDRSTRLEN];
rcvif = m_get_rcvif_psref(m, &psref);
if (__predict_false(rcvif == NULL))
goto freeit;
#define ICMP6_MAXLEN (sizeof(*nip6) + sizeof(*nicmp6) + 4)
KASSERT(ICMP6_MAXLEN < MCLBYTES);
icmp6_ifstat_inc(rcvif, ifs6_in_msg);
/*
* Locate icmp6 structure in mbuf, and check
* that not corrupted and of at least minimum length
*/
if (icmp6len < sizeof(struct icmp6_hdr)) {
ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
icmp6_ifstat_inc(rcvif, ifs6_in_error);
goto freeit;
}
if (m->m_len < sizeof(struct ip6_hdr)) {
m = m_pullup(m, sizeof(struct ip6_hdr));
if (m == NULL) {
ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
icmp6_ifstat_inc(rcvif, ifs6_in_error);
goto freeit;
}
}
ip6 = mtod(m, struct ip6_hdr *);
IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
if (icmp6 == NULL) {
ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
icmp6_ifstat_inc(rcvif, ifs6_in_error);
goto freeit;
}
/*
* Enforce alignment requirements that are violated in
* some cases, see kern/50766 for details.
*/
if (ACCESSIBLE_POINTER(icmp6, struct ip6_hdr) == 0) {
m = m_copyup(m, off + sizeof(struct icmp6_hdr), 0);
if (m == NULL) {
ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
icmp6_ifstat_inc(rcvif, ifs6_in_error);
goto freeit;
}
ip6 = mtod(m, struct ip6_hdr *);
icmp6 = (struct icmp6_hdr *)(mtod(m, char *) + off);
}
KASSERT(ACCESSIBLE_POINTER(icmp6, struct ip6_hdr));
/*
* calculate the checksum
*/
if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) {
nd6log(LOG_ERR, "ICMP6 checksum error(%d|%x) %s\n",
icmp6->icmp6_type, sum, IN6_PRINT(ip6buf, &ip6->ip6_src));
ICMP6_STATINC(ICMP6_STAT_CHECKSUM);
icmp6_ifstat_inc(rcvif, ifs6_in_error);
goto freeit;
}
#if defined(NFAITH) && 0 < NFAITH
if (faithprefix(&ip6->ip6_dst)) {
/*
* Deliver very specific ICMP6 type only.
* This is important to deliver TOOBIG. Otherwise PMTUD
* will not work.
*/
switch (icmp6->icmp6_type) {
case ICMP6_DST_UNREACH:
case ICMP6_PACKET_TOO_BIG:
case ICMP6_TIME_EXCEEDED:
break;
default:
goto freeit;
}
}
#endif
code = icmp6->icmp6_code;
ICMP6_STATINC(ICMP6_STAT_INHIST + icmp6->icmp6_type);
switch (icmp6->icmp6_type) {
case ICMP6_DST_UNREACH:
icmp6_ifstat_inc(rcvif, ifs6_in_dstunreach);
switch (code) {
case ICMP6_DST_UNREACH_NOROUTE:
code = PRC_UNREACH_NET;
break;
case ICMP6_DST_UNREACH_ADMIN:
icmp6_ifstat_inc(rcvif, ifs6_in_adminprohib);
code = PRC_UNREACH_PROTOCOL; /* is this a good code? */
break;
case ICMP6_DST_UNREACH_ADDR:
code = PRC_HOSTDEAD;
break;
case ICMP6_DST_UNREACH_BEYONDSCOPE:
/* I mean "source address was incorrect." */
code = PRC_UNREACH_NET;
break;
case ICMP6_DST_UNREACH_NOPORT:
code = PRC_UNREACH_PORT;
break;
default:
goto badcode;
}
goto deliver;
case ICMP6_PACKET_TOO_BIG:
icmp6_ifstat_inc(rcvif, ifs6_in_pkttoobig);
/*
* MTU is checked in icmp6_mtudisc.
*/
code = PRC_MSGSIZE;
/*
* Updating the path MTU will be done after examining
* intermediate extension headers.
*/
goto deliver;
case ICMP6_TIME_EXCEEDED:
icmp6_ifstat_inc(rcvif, ifs6_in_timeexceed);
switch (code) {
case ICMP6_TIME_EXCEED_TRANSIT:
code = PRC_TIMXCEED_INTRANS;
break;
case ICMP6_TIME_EXCEED_REASSEMBLY:
code = PRC_TIMXCEED_REASS;
break;
default:
goto badcode;
}
goto deliver;
case ICMP6_PARAM_PROB:
icmp6_ifstat_inc(rcvif, ifs6_in_paramprob);
switch (code) {
case ICMP6_PARAMPROB_NEXTHEADER:
code = PRC_UNREACH_PROTOCOL;
break;
case ICMP6_PARAMPROB_HEADER:
case ICMP6_PARAMPROB_OPTION:
code = PRC_PARAMPROB;
break;
default:
goto badcode;
}
goto deliver;
case ICMP6_ECHO_REQUEST:
icmp6_ifstat_inc(rcvif, ifs6_in_echo);
if (code != 0)
goto badcode;
/*
* Copy mbuf to send to two data paths: userland socket(s),
* and to the querier (echo reply).
* m: a copy for socket, n: a copy for querier
*
* If the first mbuf is shared, or the first mbuf is too short,
* copy the first part of the data into a fresh mbuf.
* Otherwise, we will wrongly overwrite both copies.
*/
if ((n = m_copypacket(m, M_DONTWAIT)) == NULL) {
/* Give up local */
n = m;
m = NULL;
} else if (M_UNWRITABLE(n, off + sizeof(struct icmp6_hdr))) {
struct mbuf *n0 = n;
/*
* Prepare an internal mbuf. m_pullup() doesn't
* always copy the length we specified.
*/
if ((n = m_dup(n0, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
/* Give up local */
n = m;
m = NULL;
}
m_freem(n0);
}
IP6_EXTHDR_GET(nicmp6, struct icmp6_hdr *, n, off,
sizeof(*nicmp6));
if (nicmp6 == NULL)
goto freeit;
nicmp6->icmp6_type = ICMP6_ECHO_REPLY;
nicmp6->icmp6_code = 0;
if (n) {
uint64_t *icmp6s = ICMP6_STAT_GETREF();
icmp6s[ICMP6_STAT_REFLECT]++;
icmp6s[ICMP6_STAT_OUTHIST + ICMP6_ECHO_REPLY]++;
ICMP6_STAT_PUTREF();
icmp6_reflect(n, off);
}
if (!m)
goto freeit;
break;
case ICMP6_ECHO_REPLY:
icmp6_ifstat_inc(rcvif, ifs6_in_echoreply);
if (code != 0)
goto badcode;
break;
case MLD_LISTENER_QUERY:
case MLD_LISTENER_REPORT:
if (icmp6len < sizeof(struct mld_hdr))
goto badlen;
if (icmp6->icmp6_type == MLD_LISTENER_QUERY) /* XXX: ugly... */
icmp6_ifstat_inc(rcvif, ifs6_in_mldquery);
else
icmp6_ifstat_inc(rcvif, ifs6_in_mldreport);
if ((n = m_copypacket(m, M_DONTWAIT)) == NULL) {
/* give up local */
mld_input(m, off);
m = NULL;
goto freeit;
}
mld_input(n, off);
/* m stays. */
break;
case MLD_LISTENER_DONE:
icmp6_ifstat_inc(rcvif, ifs6_in_mlddone);
if (icmp6len < sizeof(struct mld_hdr)) /* necessary? */
goto badlen;
break; /* nothing to be done in kernel */
case MLD_MTRACE_RESP:
case MLD_MTRACE:
/* XXX: these two are experimental. not officially defined. */
/* XXX: per-interface statistics? */
break; /* just pass it to applications */
case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */
{
enum { WRU, FQDN } mode;
if (!icmp6_nodeinfo)
break;
if (icmp6len == sizeof(struct icmp6_hdr) + 4)
mode = WRU;
else if (icmp6len >= sizeof(struct icmp6_nodeinfo))
mode = FQDN;
else
goto badlen;
if (mode == FQDN) {
n = m_copypacket(m, M_DONTWAIT);
if (n)
n = ni6_input(n, off);
} else {
u_char *p;
int maxhlen;
if ((icmp6_nodeinfo & 5) != 5)
break;
if (code != 0)
goto badcode;
MGETHDR(n, M_DONTWAIT, m->m_type);
if (n && ICMP6_MAXLEN > MHLEN) {
MCLGET(n, M_DONTWAIT);
if ((n->m_flags & M_EXT) == 0) {
m_free(n);
n = NULL;
}
}
if (n == NULL) {
/* Give up remote */
break;
}
m_reset_rcvif(n);
n->m_len = 0;
maxhlen = M_TRAILINGSPACE(n) - ICMP6_MAXLEN;
if (maxhlen < 0) {
m_free(n);
break;
}
if (maxhlen > hostnamelen)
maxhlen = hostnamelen;
/*
* Copy IPv6 and ICMPv6 only.
*/
nip6 = mtod(n, struct ip6_hdr *);
memcpy(nip6, ip6, sizeof(struct ip6_hdr));
nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
memcpy(nicmp6, icmp6, sizeof(struct icmp6_hdr));
p = (u_char *)(nicmp6 + 1);
memset(p, 0, 4);
memcpy(p + 4, hostname, maxhlen); /* meaningless TTL */
m_copy_pkthdr(n, m);
n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
sizeof(struct icmp6_hdr) + 4 + maxhlen;
nicmp6->icmp6_type = ICMP6_WRUREPLY;
nicmp6->icmp6_code = 0;
}
if (n) {
uint64_t *icmp6s = ICMP6_STAT_GETREF();
icmp6s[ICMP6_STAT_REFLECT]++;
icmp6s[ICMP6_STAT_OUTHIST + ICMP6_WRUREPLY]++;
ICMP6_STAT_PUTREF();
icmp6_reflect(n, sizeof(struct ip6_hdr));
}
break;
}
case ICMP6_WRUREPLY:
if (code != 0)
goto badcode;
break;
case ND_ROUTER_SOLICIT:
icmp6_ifstat_inc(rcvif, ifs6_in_routersolicit);
/* FALLTHROUGH */
case ND_ROUTER_ADVERT:
if (icmp6->icmp6_type == ND_ROUTER_ADVERT)
icmp6_ifstat_inc(rcvif, ifs6_in_routeradvert);
if (code != 0)
goto badcode;
if ((icmp6->icmp6_type == ND_ROUTER_SOLICIT &&
icmp6len < sizeof(struct nd_router_solicit)) ||
(icmp6->icmp6_type == ND_ROUTER_ADVERT &&
icmp6len < sizeof(struct nd_router_advert)))
goto badlen;
if ((n = m_copypacket(m, M_DONTWAIT)) == NULL) {
/* give up local */
nd6_rtr_cache(m, off, icmp6len, icmp6->icmp6_type);
m = NULL;
goto freeit;
}
nd6_rtr_cache(n, off, icmp6len, icmp6->icmp6_type);
/* m stays. */
break;
case ND_NEIGHBOR_SOLICIT:
icmp6_ifstat_inc(rcvif, ifs6_in_neighborsolicit);
if (code != 0)
goto badcode;
if (icmp6len < sizeof(struct nd_neighbor_solicit))
goto badlen;
if ((n = m_copypacket(m, M_DONTWAIT)) == NULL) {
/* give up local */
nd6_ns_input(m, off, icmp6len);
m = NULL;
goto freeit;
}
nd6_ns_input(n, off, icmp6len);
/* m stays. */
break;
case ND_NEIGHBOR_ADVERT:
icmp6_ifstat_inc(rcvif, ifs6_in_neighboradvert);
if (code != 0)
goto badcode;
if (icmp6len < sizeof(struct nd_neighbor_advert))
goto badlen;
if ((n = m_copypacket(m, M_DONTWAIT)) == NULL) {
/* give up local */
nd6_na_input(m, off, icmp6len);
m = NULL;
goto freeit;
}
nd6_na_input(n, off, icmp6len);
/* m stays. */
break;
case ND_REDIRECT:
icmp6_ifstat_inc(rcvif, ifs6_in_redirect);
if (code != 0)
goto badcode;
if (icmp6len < sizeof(struct nd_redirect))
goto badlen;
if ((n = m_copypacket(m, M_DONTWAIT)) == NULL) {
/* give up local */
icmp6_redirect_input(m, off);
m = NULL;
goto freeit;
}
icmp6_redirect_input(n, off);
/* m stays. */
break;
case ICMP6_ROUTER_RENUMBERING:
if (code != ICMP6_ROUTER_RENUMBERING_COMMAND &&
code != ICMP6_ROUTER_RENUMBERING_RESULT)
goto badcode;
if (icmp6len < sizeof(struct icmp6_router_renum))
goto badlen;
break;
default:
nd6log(LOG_DEBUG,
"unknown type %d(src=%s, dst=%s, ifid=%d)\n",
icmp6->icmp6_type,
IN6_PRINT(ip6buf, &ip6->ip6_src),
IN6_PRINT(ip6buf2, &ip6->ip6_dst),
rcvif ? rcvif->if_index : 0);
if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) {
/* ICMPv6 error: MUST deliver it by spec... */
code = PRC_NCMDS;
/* deliver */
} else {
/* ICMPv6 informational: MUST not deliver */
break;
}
deliver:
if (icmp6_notify_error(m, off, icmp6len, code)) {
/* In this case, m should've been freed. */
m_put_rcvif_psref(rcvif, &psref);
return;
}
break;
badcode:
ICMP6_STATINC(ICMP6_STAT_BADCODE);
break;
badlen:
ICMP6_STATINC(ICMP6_STAT_BADLEN);
break;
}
m_put_rcvif_psref(rcvif, &psref);
/* deliver the packet to appropriate sockets */
icmp6_rip6_input(&m, off);
return;
freeit:
m_put_rcvif_psref(rcvif, &psref);
m_freem(m);
return;
}
int
icmp6_input(struct mbuf **mp, int *offp, int proto)
{
wqinput_input(icmp6_wqinput, *mp, *offp, proto);
return IPPROTO_DONE;
}
static int
icmp6_notify_error(struct mbuf *m, int off, int icmp6len, int code)
{
struct icmp6_hdr *icmp6;
struct ip6_hdr *eip6;
u_int32_t notifymtu;
struct sockaddr_in6 icmp6src, icmp6dst;
if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) {
ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
goto freeit;
}
IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
sizeof(*icmp6) + sizeof(struct ip6_hdr));
if (icmp6 == NULL) {
ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
return (-1);
}
eip6 = (struct ip6_hdr *)(icmp6 + 1);
/* Detect the upper level protocol */
{
void *(*ctlfunc)(int, const struct sockaddr *, void *);
u_int8_t nxt = eip6->ip6_nxt;
int eoff = off + sizeof(struct icmp6_hdr) +
sizeof(struct ip6_hdr);
struct ip6ctlparam ip6cp;
struct in6_addr *finaldst = NULL;
int icmp6type = icmp6->icmp6_type;
struct ip6_frag *fh;
struct ip6_rthdr *rth;
struct ifnet *rcvif;
int s;
while (1) { /* XXX: should avoid infinite loop explicitly? */
struct ip6_ext *eh;
switch (nxt) {
case IPPROTO_HOPOPTS:
case IPPROTO_DSTOPTS:
case IPPROTO_AH:
IP6_EXTHDR_GET(eh, struct ip6_ext *, m,
eoff, sizeof(*eh));
if (eh == NULL) {
ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
return (-1);
}
if (nxt == IPPROTO_AH)
eoff += (eh->ip6e_len + 2) << 2;
else
eoff += (eh->ip6e_len + 1) << 3;
nxt = eh->ip6e_nxt;
break;
case IPPROTO_ROUTING:
/* Ignore the option. */
IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m,
eoff, sizeof(*rth));
if (rth == NULL) {
ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
return (-1);
}
eoff += (rth->ip6r_len + 1) << 3;
nxt = rth->ip6r_nxt;
break;
case IPPROTO_FRAGMENT:
IP6_EXTHDR_GET(fh, struct ip6_frag *, m,
eoff, sizeof(*fh));
if (fh == NULL) {
ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
return (-1);
}
/*
* Data after a fragment header is meaningless
* unless it is the first fragment, but
* we'll go to the notify label for path MTU
* discovery.
*/
if (fh->ip6f_offlg & IP6F_OFF_MASK)
goto notify;
eoff += sizeof(struct ip6_frag);
nxt = fh->ip6f_nxt;
break;
default:
/*
* This case includes ESP and the No Next
* Header. In such cases going to the notify
* label does not have any meaning
* (i.e. ctlfunc will be NULL), but we go
* anyway since we might have to update
* path MTU information.
*/
goto notify;
}
}
notify:
IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
sizeof(*icmp6) + sizeof(struct ip6_hdr));
if (icmp6 == NULL) {
ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
return (-1);
}
/*
* retrieve parameters from the inner IPv6 header, and convert
* them into sockaddr structures.
* XXX: there is no guarantee that the source or destination
* addresses of the inner packet are in the same scope zone as
* the addresses of the icmp packet. But there is no other
* way to determine the zone.
*/
eip6 = (struct ip6_hdr *)(icmp6 + 1);
rcvif = m_get_rcvif(m, &s);
if (__predict_false(rcvif == NULL))
goto freeit;
sockaddr_in6_init(&icmp6dst,
(finaldst == NULL) ? &eip6->ip6_dst : finaldst, 0, 0, 0);
if (in6_setscope(&icmp6dst.sin6_addr, rcvif, NULL)) {
m_put_rcvif(rcvif, &s);
goto freeit;
}
sockaddr_in6_init(&icmp6src, &eip6->ip6_src, 0, 0, 0);
if (in6_setscope(&icmp6src.sin6_addr, rcvif, NULL)) {
m_put_rcvif(rcvif, &s);
goto freeit;
}
m_put_rcvif(rcvif, &s);
icmp6src.sin6_flowinfo =
(eip6->ip6_flow & IPV6_FLOWLABEL_MASK);
if (finaldst == NULL)
finaldst = &eip6->ip6_dst;
ip6cp.ip6c_m = m;
ip6cp.ip6c_icmp6 = icmp6;
ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1);
ip6cp.ip6c_off = eoff;
ip6cp.ip6c_finaldst = finaldst;
ip6cp.ip6c_src = &icmp6src;
ip6cp.ip6c_nxt = nxt;
if (icmp6type == ICMP6_PACKET_TOO_BIG) {
notifymtu = ntohl(icmp6->icmp6_mtu);
ip6cp.ip6c_cmdarg = (void *)&notifymtu;
}
ctlfunc = inet6sw[ip6_protox[nxt]].pr_ctlinput;
if (ctlfunc) {
(void)(*ctlfunc)(code, sin6tosa(&icmp6dst), &ip6cp);
}
}
return (0);
freeit:
m_freem(m);
return (-1);
}
void
icmp6_mtudisc_update(struct ip6ctlparam *ip6cp, int validated)
{
unsigned long rtcount;
struct icmp6_mtudisc_callback *mc;
struct in6_addr *dst = ip6cp->ip6c_finaldst;
struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6;
struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */
u_int mtu = ntohl(icmp6->icmp6_mtu);
struct rtentry *rt = NULL;
struct sockaddr_in6 sin6;
struct ifnet *rcvif;
int s;
/*
* The MTU should not be less than the minimal IPv6 MTU except for the
* hack in ip6_output/ip6_setpmtu where we always include a frag header.
* In that one case, the MTU might be less than 1280.
*/
if (__predict_false(mtu < IPV6_MMTU - sizeof(struct ip6_frag))) {
/* is the mtu even sane? */
if (mtu < sizeof(struct ip6_hdr) + sizeof(struct ip6_frag) + 8)
return;
if (!validated)
return;
mtu = IPV6_MMTU - sizeof(struct ip6_frag);
}
/*
* allow non-validated cases if memory is plenty, to make traffic
* from non-connected pcb happy.
*/
mutex_enter(&icmp6_mtx);
rtcount = rt_timer_count(icmp6_mtudisc_timeout_q);
if (validated) {
if (0 <= icmp6_mtudisc_hiwat && rtcount > icmp6_mtudisc_hiwat) {
mutex_exit(&icmp6_mtx);
return;
} else if (0 <= icmp6_mtudisc_lowat &&
rtcount > icmp6_mtudisc_lowat) {
/*
* XXX nuke a victim, install the new one.
*/
}
} else {
if (0 <= icmp6_mtudisc_lowat && rtcount > icmp6_mtudisc_lowat) {
mutex_exit(&icmp6_mtx);
return;
}
}
mutex_exit(&icmp6_mtx);
memset(&sin6, 0, sizeof(sin6));
sin6.sin6_family = PF_INET6;
sin6.sin6_len = sizeof(struct sockaddr_in6);
sin6.sin6_addr = *dst;
rcvif = m_get_rcvif(m, &s);
if (__predict_false(rcvif == NULL))
return;
if (in6_setscope(&sin6.sin6_addr, rcvif, NULL)) {
m_put_rcvif(rcvif, &s);
return;
}
m_put_rcvif(rcvif, &s);
rt = icmp6_mtudisc_clone(sin6tosa(&sin6));
if (rt && (rt->rt_flags & RTF_HOST) &&
!(rt->rt_rmx.rmx_locks & RTV_MTU) &&
(rt->rt_rmx.rmx_mtu > mtu || rt->rt_rmx.rmx_mtu == 0)) {
if (mtu < rt->rt_ifp->if_mtu) {
ICMP6_STATINC(ICMP6_STAT_PMTUCHG);
rt->rt_rmx.rmx_mtu = mtu;
}
}
if (rt) {
rt_unref(rt);
}
/*
* Notify protocols that the MTU for this destination
* has changed.
*/
mutex_enter(&icmp6_mtx);
for (mc = LIST_FIRST(&icmp6_mtudisc_callbacks); mc != NULL;
mc = LIST_NEXT(mc, mc_list))
(*mc->mc_func)(&sin6.sin6_addr);
mutex_exit(&icmp6_mtx);
}
/*
* Process a Node Information Query packet, based on
* draft-ietf-ipngwg-icmp-name-lookups-07.
*
* Spec incompatibilities:
* - IPv6 Subject address handling
* - IPv4 Subject address handling support missing
* - Proxy reply (answer even if it's not for me)
* - joins NI group address at in6_ifattach() time only, does not cope
* with hostname changes by sethostname(3)
*/
static struct mbuf *
ni6_input(struct mbuf *m, int off)
{
struct icmp6_nodeinfo *ni6, *nni6;
struct mbuf *n = NULL;
u_int16_t qtype;
int subjlen;
int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
struct ni_reply_fqdn *fqdn;
int addrs; /* for NI_QTYPE_NODEADDR */
struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */
struct sockaddr_in6 sin6; /* ip6_dst */
struct in6_addr in6_subj; /* subject address */
struct ip6_hdr *ip6;
int oldfqdn = 0; /* if 1, return pascal string (03 draft) */
char *subj = NULL;
struct ifnet *rcvif;
int s, ss;
struct ifaddr *ifa;
struct psref psref;
ip6 = mtod(m, struct ip6_hdr *);
IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6));
if (ni6 == NULL) {
/* m is already reclaimed */
return NULL;
}
KASSERT((m->m_flags & M_PKTHDR) != 0);
/*
* Validate IPv6 destination address.
*
* The Responder must discard the Query without further processing
* unless it is one of the Responder's unicast or anycast addresses, or
* a link-local scope multicast address which the Responder has joined.
* [icmp-name-lookups-07, Section 4.]
*/
sockaddr_in6_init(&sin6, &ip6->ip6_dst, 0, 0, 0);
/* XXX scopeid */
ss = pserialize_read_enter();
ifa = ifa_ifwithaddr(sin6tosa(&sin6));
if (ifa != NULL) {
; /* unicast/anycast, fine */
} else if (IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr)) {
; /* link-local multicast, fine */
} else {
pserialize_read_exit(ss);
goto bad;
}
pserialize_read_exit(ss);
/* validate query Subject field. */
qtype = ntohs(ni6->ni_qtype);
subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo);
switch (qtype) {
case NI_QTYPE_NOOP:
case NI_QTYPE_SUPTYPES:
/* 07 draft */
if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0)
break;
/* FALLTHROUGH */
case NI_QTYPE_FQDN:
case NI_QTYPE_NODEADDR:
case NI_QTYPE_IPV4ADDR:
switch (ni6->ni_code) {
case ICMP6_NI_SUBJ_IPV6:
#if ICMP6_NI_SUBJ_IPV6 != 0
case 0:
#endif
/*
* backward compatibility - try to accept 03 draft
* format, where no Subject is present.
*/
if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 &&
subjlen == 0) {
oldfqdn++;
break;
}
#if ICMP6_NI_SUBJ_IPV6 != 0
if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6)
goto bad;
#endif
if (subjlen != sizeof(sin6.sin6_addr))
goto bad;
/*
* Validate Subject address.
*
* Not sure what exactly "address belongs to the node"
* means in the spec, is it just unicast, or what?
*
* At this moment we consider Subject address as
* "belong to the node" if the Subject address equals
* to the IPv6 destination address; validation for
* IPv6 destination address should have done enough
* check for us.
*
* We do not do proxy at this moment.
*/
/* m_pulldown instead of copy? */
m_copydata(m, off + sizeof(struct icmp6_nodeinfo),
subjlen, (void *)&in6_subj);
rcvif = m_get_rcvif(m, &s);
if (__predict_false(rcvif == NULL))
goto bad;
if (in6_setscope(&in6_subj, rcvif, NULL)) {
m_put_rcvif(rcvif, &s);
goto bad;
}
m_put_rcvif(rcvif, &s);
subj = (char *)&in6_subj;
if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &in6_subj))
break;
/*
* XXX if we are to allow other cases, we should really
* be careful about scope here.
* basically, we should disallow queries toward IPv6
* destination X with subject Y, if scope(X) > scope(Y).
* if we allow scope(X) > scope(Y), it will result in
* information leakage across scope boundary.
*/
goto bad;
case ICMP6_NI_SUBJ_FQDN:
/*
* Validate Subject name with gethostname(3).
*
* The behavior may need some debate, since:
* - we are not sure if the node has FQDN as
* hostname (returned by gethostname(3)).
* - the code does wildcard match for truncated names.
* however, we are not sure if we want to perform
* wildcard match, if gethostname(3) side has
* truncated hostname.
*/
n = ni6_nametodns(hostname, hostnamelen, 0);
if (!n || n->m_next || n->m_len == 0)
goto bad;
IP6_EXTHDR_GET(subj, char *, m,
off + sizeof(struct icmp6_nodeinfo), subjlen);
if (subj == NULL)
goto bad;
if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *),
n->m_len)) {
goto bad;
}
m_freem(n);
n = NULL;
break;
case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */
default:
goto bad;
}
break;
}
/* refuse based on configuration. XXX ICMP6_NI_REFUSED? */
switch (qtype) {
case NI_QTYPE_FQDN:
if ((icmp6_nodeinfo & 1) == 0)
goto bad;
break;
case NI_QTYPE_NODEADDR:
case NI_QTYPE_IPV4ADDR:
if ((icmp6_nodeinfo & 2) == 0)
goto bad;
break;
}
/* guess reply length */
switch (qtype) {
case NI_QTYPE_NOOP:
break; /* no reply data */
case NI_QTYPE_SUPTYPES:
replylen += sizeof(u_int32_t);
break;
case NI_QTYPE_FQDN:
/* will append an mbuf */
replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
break;
case NI_QTYPE_NODEADDR:
addrs = ni6_addrs(ni6, &ifp, subj, &psref);
replylen += addrs *
(sizeof(struct in6_addr) + sizeof(u_int32_t));
if (replylen > MCLBYTES)
replylen = MCLBYTES; /* XXX: will truncate pkt later */
break;
case NI_QTYPE_IPV4ADDR:
/* unsupported - should respond with unknown Qtype? */
goto bad;
default:
/*
* XXX: We must return a reply with the ICMP6 code
* `unknown Qtype' in this case. However we regard the case
* as an FQDN query for backward compatibility.
* Older versions set a random value to this field,
* so it rarely varies in the defined qtypes.
* But the mechanism is not reliable...
* maybe we should obsolete older versions.
*/
qtype = NI_QTYPE_FQDN;
/* will append an mbuf */
replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
oldfqdn++;
break;
}
/* allocate an mbuf to reply. */
MGETHDR(n, M_DONTWAIT, m->m_type);
if (n == NULL) {
goto bad;
}
m_move_pkthdr(n, m);
if (replylen > MHLEN) {
if (replylen > MCLBYTES) {
/*
* XXX: should we try to allocate more? But MCLBYTES
* is probably much larger than IPV6_MMTU...
*/
goto bad;
}
MCLGET(n, M_DONTWAIT);
if ((n->m_flags & M_EXT) == 0) {
goto bad;
}
}
n->m_pkthdr.len = n->m_len = replylen;
/* copy mbuf header and IPv6 + Node Information base headers */
bcopy(mtod(m, void *), mtod(n, void *), sizeof(struct ip6_hdr));
nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1);
bcopy((void *)ni6, (void *)nni6, sizeof(struct icmp6_nodeinfo));
/* qtype dependent procedure */
switch (qtype) {
case NI_QTYPE_NOOP:
nni6->ni_code = ICMP6_NI_SUCCESS;
nni6->ni_flags = 0;
break;
case NI_QTYPE_SUPTYPES:
{
u_int32_t v;
nni6->ni_code = ICMP6_NI_SUCCESS;
nni6->ni_flags = htons(0x0000); /* raw bitmap */
/* supports NOOP, SUPTYPES, FQDN, and NODEADDR */
v = (u_int32_t)htonl(0x0000000f);
memcpy(nni6 + 1, &v, sizeof(u_int32_t));
break;
}
case NI_QTYPE_FQDN:
nni6->ni_code = ICMP6_NI_SUCCESS;
fqdn = (struct ni_reply_fqdn *)(mtod(n, char *) +
sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo));
nni6->ni_flags = 0; /* XXX: meaningless TTL */
fqdn->ni_fqdn_ttl = 0; /* ditto. */
/*
* XXX do we really have FQDN in variable "hostname"?
*/
n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn);
if (n->m_next == NULL)
goto bad;
/* XXX we assume that n->m_next is not a chain */
if (n->m_next->m_next != NULL)
goto bad;
n->m_pkthdr.len += n->m_next->m_len;
break;
case NI_QTYPE_NODEADDR:
{
int lenlim, copied;
nni6->ni_code = ICMP6_NI_SUCCESS;
n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
sizeof(struct icmp6_nodeinfo);
lenlim = M_TRAILINGSPACE(n);
copied = ni6_store_addrs(ni6, nni6, ifp, lenlim);
if_put(ifp, &psref);
ifp = NULL;
/* update mbuf length */
n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
sizeof(struct icmp6_nodeinfo) + copied;
break;
}
default:
panic("%s: impossible", __func__);
break;
}
nni6->ni_type = ICMP6_NI_REPLY;
m_freem(m);
return n;
bad:
if_put(ifp, &psref);
m_freem(m);
if (n)
m_freem(n);
return NULL;
}
#define isupper(x) ('A' <= (x) && (x) <= 'Z')
#define isalpha(x) (('A' <= (x) && (x) <= 'Z') || ('a' <= (x) && (x) <= 'z'))
#define isalnum(x) (isalpha(x) || ('0' <= (x) && (x) <= '9'))
#define tolower(x) (isupper(x) ? (x) + 'a' - 'A' : (x))
/*
* make a mbuf with DNS-encoded string. no compression support.
*
* XXX names with less than 2 dots (like "foo" or "foo.section") will be
* treated as truncated name (two \0 at the end). this is a wild guess.
*
* old - return pascal string if non-zero
*/
static struct mbuf *
ni6_nametodns(const char *name, int namelen, int old)
{
struct mbuf *m;
char *cp, *ep;
const char *p, *q;
int i, len, nterm;
if (old)
len = namelen + 1;
else
len = MCLBYTES;
/* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */
MGET(m, M_DONTWAIT, MT_DATA);
if (m && len > MLEN) {
MCLGET(m, M_DONTWAIT);
if ((m->m_flags & M_EXT) == 0)
goto fail;
}
if (!m)
goto fail;
m->m_next = NULL;
if (old) {
m->m_len = len;
*mtod(m, char *) = namelen;
memcpy(mtod(m, char *) + 1, name, namelen);
return m;
} else {
m->m_len = 0;
cp = mtod(m, char *);
ep = mtod(m, char *) + M_TRAILINGSPACE(m);
/* if not certain about my name, return empty buffer */
if (namelen == 0)
return m;
/*
* guess if it looks like shortened hostname, or FQDN.
* shortened hostname needs two trailing "\0".
*/
i = 0;
for (p = name; p < name + namelen; p++) {
if (*p == '.')
i++;
}
if (i < 2)
nterm = 2;
else
nterm = 1;
p = name;
while (cp < ep && p < name + namelen) {
i = 0;
for (q = p; q < name + namelen && *q && *q != '.'; q++)
i++;
/* result does not fit into mbuf */
if (cp + i + 1 >= ep)
goto fail;
/*
* DNS label length restriction, RFC1035 page 8.
* "i == 0" case is included here to avoid returning
* 0-length label on "foo..bar".
*/
if (i <= 0 || i >= 64)
goto fail;
*cp++ = i;
if (!isalpha(p[0]) || !isalnum(p[i - 1]))
goto fail;
while (i > 0) {
if (!isalnum(*p) && *p != '-')
goto fail;
if (isupper(*p)) {
*cp++ = tolower(*p);
p++;
} else
*cp++ = *p++;
i--;
}
p = q;
if (p < name + namelen && *p == '.')
p++;
}
/* termination */
if (cp + nterm >= ep)
goto fail;
while (nterm-- > 0)
*cp++ = '\0';
m->m_len = cp - mtod(m, char *);
return m;
}
panic("should not reach here");
/* NOTREACHED */
fail:
if (m)
m_freem(m);
return NULL;
}
/*
* check if two DNS-encoded string matches. takes care of truncated
* form (with \0\0 at the end). no compression support.
* XXX upper/lowercase match (see RFC2065)
*/
static int
ni6_dnsmatch(const char *a, int alen, const char *b, int blen)
{
const char *a0, *b0;
int l;
/* simplest case - need validation? */
if (alen == blen && memcmp(a, b, alen) == 0)
return 1;
a0 = a;
b0 = b;
/* termination is mandatory */
if (alen < 2 || blen < 2)
return 0;
if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0')
return 0;
alen--;
blen--;
while (a - a0 < alen && b - b0 < blen) {
if (a - a0 + 1 > alen || b - b0 + 1 > blen)
return 0;
if ((signed char)a[0] < 0 || (signed char)b[0] < 0)
return 0;
/* we don't support compression yet */
if (a[0] >= 64 || b[0] >= 64)
return 0;
/* truncated case */
if (a[0] == 0 && a - a0 == alen - 1)
return 1;
if (b[0] == 0 && b - b0 == blen - 1)
return 1;
if (a[0] == 0 || b[0] == 0)
return 0;
if (a[0] != b[0])
return 0;
l = a[0];
if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen)
return 0;
if (memcmp(a + 1, b + 1, l) != 0)
return 0;
a += 1 + l;
b += 1 + l;
}
if (a - a0 == alen && b - b0 == blen)
return 1;
else
return 0;
}
/*
* calculate the number of addresses to be returned in the node info reply.
*/
static int
ni6_addrs(struct icmp6_nodeinfo *ni6, struct ifnet **ifpp, char *subj,
struct psref *psref)
{
struct ifnet *ifp;
struct in6_ifaddr *ia6;
struct ifaddr *ifa;
struct sockaddr_in6 *subj_ip6 = NULL; /* XXX pedant */
int addrs = 0, addrsofif, iffound = 0;
int niflags = ni6->ni_flags;
int s;
if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) {
switch (ni6->ni_code) {
case ICMP6_NI_SUBJ_IPV6:
if (subj == NULL) /* must be impossible... */
return 0;
subj_ip6 = (struct sockaddr_in6 *)subj;
break;
default:
/*
* XXX: we only support IPv6 subject address for
* this Qtype.
*/
return 0;
}
}
s = pserialize_read_enter();
IFNET_READER_FOREACH(ifp) {
addrsofif = 0;
IFADDR_READER_FOREACH(ifa, ifp) {
if (ifa->ifa_addr->sa_family != AF_INET6)
continue;
ia6 = (struct in6_ifaddr *)ifa;
if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 &&
IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr,
&ia6->ia_addr.sin6_addr))
iffound = 1;
/*
* IPv4-mapped addresses can only be returned by a
* Node Information proxy, since they represent
* addresses of IPv4-only nodes, which perforce do
* not implement this protocol.
* [icmp-name-lookups-07, Section 5.4]
* So we don't support NI_NODEADDR_FLAG_COMPAT in
* this function at this moment.
*/
/* What do we have to do about ::1? */
switch (in6_addrscope(&ia6->ia_addr.sin6_addr)) {
case IPV6_ADDR_SCOPE_LINKLOCAL:
if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
continue;
break;
case IPV6_ADDR_SCOPE_SITELOCAL:
if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
continue;
break;
case IPV6_ADDR_SCOPE_GLOBAL:
if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
continue;
break;
default:
continue;
}
/*
* check if anycast is okay.
* XXX: just experimental. not in the spec.
*/
if ((ia6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
(niflags & NI_NODEADDR_FLAG_ANYCAST) == 0)
continue; /* we need only unicast addresses */
addrsofif++; /* count the address */
}
if (iffound) {
if_acquire(ifp, psref);
pserialize_read_exit(s);
*ifpp = ifp;
return addrsofif;
}
addrs += addrsofif;
}
pserialize_read_exit(s);
return addrs;
}
static int
ni6_store_addrs(struct icmp6_nodeinfo *ni6,
struct icmp6_nodeinfo *nni6, struct ifnet *ifp0,
int resid)
{
struct ifnet *ifp;
struct in6_ifaddr *ia6;
struct ifaddr *ifa;
struct ifnet *ifp_dep = NULL;
int copied = 0, allow_deprecated = 0;
u_char *cp = (u_char *)(nni6 + 1);
int niflags = ni6->ni_flags;
u_int32_t ltime;
int s;
if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL))
return 0; /* needless to copy */
s = pserialize_read_enter();
ifp = ifp0 ? ifp0 : IFNET_READER_FIRST();
again:
for (; ifp; ifp = IFNET_READER_NEXT(ifp))
{
IFADDR_READER_FOREACH(ifa, ifp) {
if (ifa->ifa_addr->sa_family != AF_INET6)
continue;
ia6 = (struct in6_ifaddr *)ifa;
if ((ia6->ia6_flags & IN6_IFF_DEPRECATED) != 0 &&
allow_deprecated == 0) {
/*
* prefererred address should be put before
* deprecated addresses.
*/
/* record the interface for later search */
if (ifp_dep == NULL)
ifp_dep = ifp;
continue;
}
else if ((ia6->ia6_flags & IN6_IFF_DEPRECATED) == 0 &&
allow_deprecated != 0)
continue; /* we now collect deprecated addrs */
/* What do we have to do about ::1? */
switch (in6_addrscope(&ia6->ia_addr.sin6_addr)) {
case IPV6_ADDR_SCOPE_LINKLOCAL:
if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
continue;
break;
case IPV6_ADDR_SCOPE_SITELOCAL:
if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
continue;
break;
case IPV6_ADDR_SCOPE_GLOBAL:
if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
continue;
break;
default:
continue;
}
/*
* check if anycast is okay.
* XXX: just experimental. not in the spec.
*/
if ((ia6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
(niflags & NI_NODEADDR_FLAG_ANYCAST) == 0)
continue;
/* now we can copy the address */
if (resid < sizeof(struct in6_addr) +
sizeof(u_int32_t)) {
/*
* We give up much more copy.
* Set the truncate flag and return.
*/
nni6->ni_flags |= NI_NODEADDR_FLAG_TRUNCATE;
goto out;
}
/*
* Set the TTL of the address.
* The TTL value should be one of the following
* according to the specification:
*
* 1. The remaining lifetime of a DHCP lease on the
* address, or
* 2. The remaining Valid Lifetime of a prefix from
* which the address was derived through Stateless
* Autoconfiguration.
*
* Note that we currently do not support stateful
* address configuration by DHCPv6, so the former
* case can't happen.
*
* TTL must be 2^31 > TTL >= 0.
*/
if (ia6->ia6_lifetime.ia6t_expire == 0)
ltime = ND6_INFINITE_LIFETIME;
else {
if (ia6->ia6_lifetime.ia6t_expire >
time_uptime)
ltime = ia6->ia6_lifetime.ia6t_expire -
time_uptime;
else
ltime = 0;
}
if (ltime > 0x7fffffff)
ltime = 0x7fffffff;
ltime = htonl(ltime);
memcpy(cp, &ltime, sizeof(u_int32_t));
cp += sizeof(u_int32_t);
/* copy the address itself */
bcopy(&ia6->ia_addr.sin6_addr, cp,
sizeof(struct in6_addr));
in6_clearscope((struct in6_addr *)cp); /* XXX */
cp += sizeof(struct in6_addr);
resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t));
copied += (sizeof(struct in6_addr) + sizeof(u_int32_t));
}
if (ifp0) /* we need search only on the specified IF */
break;
}
if (allow_deprecated == 0 && ifp_dep != NULL) {
ifp = ifp_dep;
allow_deprecated = 1;
goto again;
}
out:
pserialize_read_exit(s);
return copied;
}
/*
* XXX almost dup'ed code with rip6_input.
*/
static int
icmp6_rip6_input(struct mbuf **mp, int off)
{
struct mbuf *m = *mp;
struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
struct inpcb *inp;
struct inpcb *last = NULL;
struct sockaddr_in6 rip6src;
struct icmp6_hdr *icmp6;
struct mbuf *n, *opts = NULL;
IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
if (icmp6 == NULL) {
/* m is already reclaimed */
return IPPROTO_DONE;
}
/*
* XXX: the address may have embedded scope zone ID, which should be
* hidden from applications.
*/
sockaddr_in6_init(&rip6src, &ip6->ip6_src, 0, 0, 0);
if (sa6_recoverscope(&rip6src)) {
m_freem(m);
return IPPROTO_DONE;
}
TAILQ_FOREACH(inp, &raw6cbtable.inpt_queue, inp_queue) {
if (inp->inp_af != AF_INET6)
continue;
if (in6p_ip6(inp).ip6_nxt != IPPROTO_ICMPV6)
continue;
if (!IN6_IS_ADDR_UNSPECIFIED(&in6p_laddr(inp)) &&
!IN6_ARE_ADDR_EQUAL(&in6p_laddr(inp), &ip6->ip6_dst))
continue;
if (!IN6_IS_ADDR_UNSPECIFIED(&in6p_faddr(inp)) &&
!IN6_ARE_ADDR_EQUAL(&in6p_faddr(inp), &ip6->ip6_src))
continue;
if (in6p_icmp6filt(inp) &&
ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type,
in6p_icmp6filt(inp)))
continue;
if (last == NULL) {
;
}
#ifdef IPSEC
else if (ipsec_used && ipsec_in_reject(m, last)) {
/* do not inject data into pcb */
}
#endif
else if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) {
if (last->inp_flags & IN6P_CONTROLOPTS)
ip6_savecontrol(last, &opts, ip6, n);
/* strip intermediate headers */
m_adj(n, off);
if (sbappendaddr(&last->inp_socket->so_rcv,
sin6tosa(&rip6src), n, opts) == 0) {
soroverflow(last->inp_socket);
m_freem(n);
if (opts)
m_freem(opts);
} else {
sorwakeup(last->inp_socket);
}
opts = NULL;
}
last = inp;
}
#ifdef IPSEC
if (ipsec_used && last && ipsec_in_reject(m, last)) {
m_freem(m);
IP6_STATDEC(IP6_STAT_DELIVERED);
/* do not inject data into pcb */
} else
#endif
if (last) {
if (last->inp_flags & IN6P_CONTROLOPTS)
ip6_savecontrol(last, &opts, ip6, m);
/* strip intermediate headers */
m_adj(m, off);
if (sbappendaddr(&last->inp_socket->so_rcv,
sin6tosa(&rip6src), m, opts) == 0) {
soroverflow(last->inp_socket);
m_freem(m);
if (opts)
m_freem(opts);
} else {
sorwakeup(last->inp_socket);
}
} else {
m_freem(m);
IP6_STATDEC(IP6_STAT_DELIVERED);
}
return IPPROTO_DONE;
}
/*
* Reflect the ip6 packet back to the source.
* OFF points to the icmp6 header, counted from the top of the mbuf.
*
* Note: RFC 1885 required that an echo reply should be truncated if it
* did not fit in with (return) path MTU, and KAME code supported the
* behavior. However, as a clarification after the RFC, this limitation
* was removed in a revised version of the spec, RFC 2463. We had kept the
* old behavior, with a (non-default) ifdef block, while the new version of
* the spec was an internet-draft status, and even after the new RFC was
* published. But it would rather make sense to clean the obsoleted part
* up, and to make the code simpler at this stage.
*/
static void
icmp6_reflect(struct mbuf *m, size_t off)
{
struct ip6_hdr *ip6;
struct icmp6_hdr *icmp6;
const struct in6_ifaddr *ia;
const struct ip6aux *ip6a;
int plen;
int type, code;
struct ifnet *outif = NULL;
struct in6_addr origdst;
struct ifnet *rcvif;
int s;
bool ip6_src_filled = false;
int flags;
/* too short to reflect */
if (off < sizeof(struct ip6_hdr)) {
nd6log(LOG_DEBUG,
"sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n",
(u_long)off, (u_long)sizeof(struct ip6_hdr),
__FILE__, __LINE__);
goto bad;
}
/*
* If there are extra headers between IPv6 and ICMPv6, strip
* off that header first.
*/
CTASSERT(sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) <= MHLEN);
if (off > sizeof(struct ip6_hdr)) {
size_t l;
struct ip6_hdr nip6;
l = off - sizeof(struct ip6_hdr);
m_copydata(m, 0, sizeof(nip6), (void *)&nip6);
m_adj(m, l);
l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
if (m->m_len < l) {
if ((m = m_pullup(m, l)) == NULL)
return;
}
memcpy(mtod(m, void *), (void *)&nip6, sizeof(nip6));
} else {
size_t l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
if (m->m_len < l) {
if ((m = m_pullup(m, l)) == NULL)
return;
}
}
plen = m->m_pkthdr.len - sizeof(struct ip6_hdr);
ip6 = mtod(m, struct ip6_hdr *);
ip6->ip6_nxt = IPPROTO_ICMPV6;
icmp6 = (struct icmp6_hdr *)(ip6 + 1);
type = icmp6->icmp6_type; /* keep type for statistics */
code = icmp6->icmp6_code; /* ditto. */
origdst = ip6->ip6_dst;
/*
* ip6_input() drops a packet if its src is multicast.
* So, the src is never multicast.
*/
ip6->ip6_dst = ip6->ip6_src;
/*
* If the incoming packet was addressed directly to us (i.e. unicast),
* use dst as the src for the reply.
* The IN6_IFF_NOTREADY case should be VERY rare, but is possible
* (for example) when we encounter an error while forwarding procedure
* destined to a duplicated address of ours.
* Note that ip6_getdstifaddr() may fail if we are in an error handling
* procedure of an outgoing packet of our own, in which case we need
* to search in the ifaddr list.
*/
if (IN6_IS_ADDR_MULTICAST(&origdst)) {
;
} else if ((ip6a = ip6_getdstifaddr(m)) != NULL) {
if ((ip6a->ip6a_flags &
(IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) {
ip6->ip6_src = ip6a->ip6a_src;
ip6_src_filled = true;
}
} else {
union {
struct sockaddr_in6 sin6;
struct sockaddr sa;
} u;
int _s;
struct ifaddr *ifa;
sockaddr_in6_init(&u.sin6, &origdst, 0, 0, 0);
_s = pserialize_read_enter();
ifa = ifa_ifwithaddr(&u.sa);
if (ifa != NULL) {
ia = ifatoia6(ifa);
if ((ia->ia6_flags &
(IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) {
ip6->ip6_src = ia->ia_addr.sin6_addr;
ip6_src_filled = true;
}
}
pserialize_read_exit(_s);
}
if (!ip6_src_filled) {
int e;
struct sockaddr_in6 sin6;
struct route ro;
/*
* This case matches to multicasts, our anycast, or unicasts
* that we do not own. Select a source address based on the
* source address of the erroneous packet.
*/
/* zone ID should be embedded */
sockaddr_in6_init(&sin6, &ip6->ip6_dst, 0, 0, 0);
memset(&ro, 0, sizeof(ro));
e = in6_selectsrc(&sin6, NULL, NULL, &ro, NULL, NULL, NULL,
&ip6->ip6_src);
rtcache_free(&ro);
if (e != 0) {
char ip6buf[INET6_ADDRSTRLEN];
nd6log(LOG_DEBUG,
"source can't be determined: "
"dst=%s, error=%d\n",
IN6_PRINT(ip6buf, &sin6.sin6_addr), e);
goto bad;
}
}
ip6->ip6_flow = 0;
ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
ip6->ip6_vfc |= IPV6_VERSION;
ip6->ip6_nxt = IPPROTO_ICMPV6;
rcvif = m_get_rcvif(m, &s);
if (rcvif) {
/* XXX: This may not be the outgoing interface */
ip6->ip6_hlim = ND_IFINFO(rcvif)->chlim;
} else {
ip6->ip6_hlim = ip6_defhlim;
}
m_put_rcvif(rcvif, &s);
m->m_pkthdr.csum_flags = 0;
icmp6->icmp6_cksum = 0;
icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6,
sizeof(struct ip6_hdr), plen);
/*
* XXX option handling
*/
m->m_flags &= ~(M_BCAST|M_MCAST);
/*
* Note for icmp6_reflect_pmtu == false
* To avoid a "too big" situation at an intermediate router
* and the path MTU discovery process, specify the IPV6_MINMTU flag.
* Note that only echo and node information replies are affected,
* since the length of ICMP6 errors is limited to the minimum MTU.
*/
flags = icmp6_reflect_pmtu ? 0 : IPV6_MINMTU;
if (ip6_output(m, NULL, NULL, flags, NULL, NULL, &outif) != 0 &&
outif)
icmp6_ifstat_inc(outif, ifs6_out_error);
if (outif)
icmp6_ifoutstat_inc(outif, type, code);
return;
bad:
m_freem(m);
return;
}
static const char *
icmp6_redirect_diag(char *buf, size_t buflen, struct in6_addr *src6,
struct in6_addr *dst6, struct in6_addr *tgt6)
{
char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
char ip6buft[INET6_ADDRSTRLEN];
snprintf(buf, buflen, "(src=%s dst=%s tgt=%s)",
IN6_PRINT(ip6bufs, src6), IN6_PRINT(ip6bufd, dst6),
IN6_PRINT(ip6buft, tgt6));
return buf;
}
static void
icmp6_redirect_input(struct mbuf *m, int off)
{
struct ifnet *ifp;
struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
struct nd_redirect *nd_rd;
int icmp6len = m->m_pkthdr.len - off;
char *lladdr = NULL;
int lladdrlen = 0;
struct rtentry *rt = NULL;
int is_router;
int is_onlink;
struct in6_addr src6 = ip6->ip6_src;
struct in6_addr redtgt6;
struct in6_addr reddst6;
union nd_opts ndopts;
struct psref psref;
char ip6buf[INET6_ADDRSTRLEN];
char diagbuf[256];
ifp = m_get_rcvif_psref(m, &psref);
if (ifp == NULL)
goto freeit;
/* XXX if we are router, we don't update route by icmp6 redirect */
if (ip6_forwarding)
goto freeit;
if (!icmp6_rediraccept)
goto freeit;
IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len);
if (nd_rd == NULL) {
ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
m_put_rcvif_psref(ifp, &psref);
return;
}
redtgt6 = nd_rd->nd_rd_target;
reddst6 = nd_rd->nd_rd_dst;
if (in6_setscope(&redtgt6, ifp, NULL) ||
in6_setscope(&reddst6, ifp, NULL)) {
goto freeit;
}
/* validation */
if (!IN6_IS_ADDR_LINKLOCAL(&src6)) {
nd6log(LOG_ERR,
"ICMP6 redirect sent from %s rejected; "
"must be from linklocal\n", IN6_PRINT(ip6buf, &src6));
goto bad;
}
if (ip6->ip6_hlim != 255) {
nd6log(LOG_ERR,
"ICMP6 redirect sent from %s rejected; "
"hlim=%d (must be 255)\n",
IN6_PRINT(ip6buf, &src6), ip6->ip6_hlim);
goto bad;
}
{
/* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */
struct sockaddr_in6 sin6;
struct in6_addr *gw6;
sockaddr_in6_init(&sin6, &reddst6, 0, 0, 0);
rt = rtalloc1(sin6tosa(&sin6), 0);
if (rt) {
if (rt->rt_gateway == NULL ||
rt->rt_gateway->sa_family != AF_INET6) {
nd6log(LOG_ERR,
"ICMP6 redirect rejected; no route "
"with inet6 gateway found for redirect dst: %s\n",
icmp6_redirect_diag(diagbuf, sizeof(diagbuf),
&src6, &reddst6, &redtgt6));
rt_unref(rt);
goto bad;
}
gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr);
if (memcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) {
nd6log(LOG_ERR,
"ICMP6 redirect rejected; "
"not equal to gw-for-src=%s (must be same): %s\n",
IN6_PRINT(ip6buf, gw6),
icmp6_redirect_diag(diagbuf, sizeof(diagbuf),
&src6, &reddst6, &redtgt6));
rt_unref(rt);
goto bad;
}
} else {
nd6log(LOG_ERR, "ICMP6 redirect rejected; "
"no route found for redirect dst: %s\n",
icmp6_redirect_diag(diagbuf, sizeof(diagbuf),
&src6, &reddst6, &redtgt6));
goto bad;
}
rt_unref(rt);
rt = NULL;
}
if (IN6_IS_ADDR_MULTICAST(&reddst6)) {
nd6log(LOG_ERR, "ICMP6 redirect rejected; "
"redirect dst must be unicast: %s\n",
icmp6_redirect_diag(diagbuf, sizeof(diagbuf),
&src6, &reddst6, &redtgt6));
goto bad;
}
is_router = is_onlink = 0;
if (IN6_IS_ADDR_LINKLOCAL(&redtgt6))
is_router = 1; /* router case */
if (memcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0)
is_onlink = 1; /* on-link destination case */
if (!is_router && !is_onlink) {
nd6log(LOG_ERR, "ICMP6 redirect rejected; "
"neither router case nor onlink case: %s\n",
icmp6_redirect_diag(diagbuf, sizeof(diagbuf),
&src6, &reddst6, &redtgt6));
goto bad;
}
/* validation passed */
icmp6len -= sizeof(*nd_rd);
nd6_option_init(nd_rd + 1, icmp6len, &ndopts);
if (nd6_options(&ndopts) < 0) {
nd6log(LOG_INFO, "invalid ND option, rejected: %s\n",
icmp6_redirect_diag(diagbuf, sizeof(diagbuf),
&src6, &reddst6, &redtgt6));
/* nd6_options have incremented stats */
goto freeit;
}
if (ndopts.nd_opts_tgt_lladdr) {
lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
}
if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
nd6log(LOG_INFO, "lladdrlen mismatch for %s "
"(if %d, icmp6 packet %d): %s\n",
IN6_PRINT(ip6buf, &redtgt6),
ifp->if_addrlen, lladdrlen - 2,
icmp6_redirect_diag(diagbuf, sizeof(diagbuf),
&src6, &reddst6, &redtgt6));
goto bad;
}
/* RFC 2461 8.3 */
nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT,
is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER);
m_put_rcvif_psref(ifp, &psref);
ifp = NULL;
if (!is_onlink) { /* better router case. perform rtredirect. */
/* perform rtredirect */
struct sockaddr_in6 sdst;
struct sockaddr_in6 sgw;
struct sockaddr_in6 ssrc;
unsigned long rtcount;
struct rtentry *newrt = NULL;
/*
* do not install redirect route, if the number of entries
* is too much (> hiwat). note that, the node (= host) will
* work just fine even if we do not install redirect route
* (there will be additional hops, though).
*/
mutex_enter(&icmp6_mtx);
rtcount = rt_timer_count(icmp6_redirect_timeout_q);
if (0 <= ip6_maxdynroutes && rtcount >= ip6_maxdynroutes) {
mutex_exit(&icmp6_mtx);
goto freeit;
}
if (0 <= icmp6_redirect_hiwat && rtcount > icmp6_redirect_hiwat) {
mutex_exit(&icmp6_mtx);
goto freeit;
} else if (0 <= icmp6_redirect_lowat &&
rtcount > icmp6_redirect_lowat) {
/*
* XXX nuke a victim, install the new one.
*/
}
memset(&sdst, 0, sizeof(sdst));
memset(&sgw, 0, sizeof(sgw));
memset(&ssrc, 0, sizeof(ssrc));
sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6;
sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len =
sizeof(struct sockaddr_in6);
bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr));
bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr));
rtredirect(sin6tosa(&sdst), sin6tosa(&sgw), NULL,
RTF_GATEWAY | RTF_HOST, sin6tosa(&ssrc), &newrt);
if (newrt) {
(void)rt_timer_add(newrt, icmp6_redirect_timeout,
icmp6_redirect_timeout_q);
rt_unref(newrt);
}
mutex_exit(&icmp6_mtx);
}
/* finally update cached route in each socket via pfctlinput */
{
struct sockaddr_in6 sdst;
sockaddr_in6_init(&sdst, &reddst6, 0, 0, 0);
pfctlinput(PRC_REDIRECT_HOST, sin6tosa(&sdst));
#if defined(IPSEC)
if (ipsec_used)
key_sa_routechange(sin6tosa(&sdst));
#endif
}
freeit:
if (ifp != NULL)
m_put_rcvif_psref(ifp, &psref);
m_freem(m);
return;
bad:
m_put_rcvif_psref(ifp, &psref);
ICMP6_STATINC(ICMP6_STAT_BADREDIRECT);
m_freem(m);
}
void
icmp6_redirect_output(struct mbuf *m0, struct rtentry *rt)
{
struct ifnet *ifp; /* my outgoing interface */
struct in6_addr *ifp_ll6;
struct in6_addr *nexthop;
struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */
struct mbuf *m = NULL; /* newly allocated one */
struct ip6_hdr *ip6; /* m as struct ip6_hdr */
struct nd_redirect *nd_rd;
size_t maxlen;
u_char *p;
struct sockaddr_in6 src_sa;
icmp6_errcount(ICMP6_STAT_OUTERRHIST, ND_REDIRECT, 0);
/* if we are not router, we don't send icmp6 redirect */
if (!ip6_forwarding)
goto fail;
/* sanity check */
KASSERT(m0 != NULL);
KASSERT(rt != NULL);
ifp = rt->rt_ifp;
/*
* Address check:
* the source address must identify a neighbor, and
* the destination address must not be a multicast address
* [RFC 2461, sec 8.2]
*/
sip6 = mtod(m0, struct ip6_hdr *);
sockaddr_in6_init(&src_sa, &sip6->ip6_src, 0, 0, 0);
if (nd6_is_addr_neighbor(&src_sa, ifp) == 0)
goto fail;
if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst))
goto fail; /* what should we do here? */
/* rate limit */
if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0))
goto fail;
/*
* Since we are going to append up to 1280 bytes (= IPV6_MMTU),
* we almost always ask for an mbuf cluster for simplicity.
* (MHLEN < IPV6_MMTU is almost always true)
*/
MGETHDR(m, M_DONTWAIT, MT_HEADER);
if (m && IPV6_MMTU >= MHLEN) {
#if IPV6_MMTU >= MCLBYTES
MEXTMALLOC(m, IPV6_MMTU, M_NOWAIT);
#else
MCLGET(m, M_DONTWAIT);
#endif
}
if (!m)
goto fail;
m_reset_rcvif(m);
m->m_len = 0;
maxlen = M_TRAILINGSPACE(m);
maxlen = uimin(IPV6_MMTU, maxlen);
/* just for safety */
if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct nd_redirect) +
((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) {
goto fail;
}
{
/* get ip6 linklocal address for ifp(my outgoing interface). */
struct in6_ifaddr *ia;
int s = pserialize_read_enter();
if ((ia = in6ifa_ifpforlinklocal(ifp,
IN6_IFF_NOTREADY|
IN6_IFF_ANYCAST)) == NULL) {
pserialize_read_exit(s);
goto fail;
}
ifp_ll6 = &ia->ia_addr.sin6_addr;
pserialize_read_exit(s);
}
/* get ip6 linklocal address for the router. */
if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) {
struct sockaddr_in6 *sin6;
sin6 = (struct sockaddr_in6 *)rt->rt_gateway;
nexthop = &sin6->sin6_addr;
if (!IN6_IS_ADDR_LINKLOCAL(nexthop))
nexthop = NULL;
} else
nexthop = NULL;
/* ip6 */
ip6 = mtod(m, struct ip6_hdr *);
ip6->ip6_flow = 0;
ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
ip6->ip6_vfc |= IPV6_VERSION;
/* ip6->ip6_plen will be set later */
ip6->ip6_nxt = IPPROTO_ICMPV6;
ip6->ip6_hlim = 255;
/* ip6->ip6_src must be linklocal addr for my outgoing if. */
bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr));
bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr));
/* ND Redirect */
nd_rd = (struct nd_redirect *)(ip6 + 1);
nd_rd->nd_rd_type = ND_REDIRECT;
nd_rd->nd_rd_code = 0;
nd_rd->nd_rd_reserved = 0;
if (rt->rt_flags & RTF_GATEWAY) {
/*
* nd_rd->nd_rd_target must be a link-local address in
* better router cases.
*/
if (!nexthop)
goto fail;
bcopy(nexthop, &nd_rd->nd_rd_target,
sizeof(nd_rd->nd_rd_target));
bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
sizeof(nd_rd->nd_rd_dst));
} else {
/* make sure redtgt == reddst */
nexthop = &sip6->ip6_dst;
bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target,
sizeof(nd_rd->nd_rd_target));
bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
sizeof(nd_rd->nd_rd_dst));
}
p = (u_char *)(nd_rd + 1);
{
/* target lladdr option */
struct llentry *ln = NULL;
int len, pad;
struct nd_opt_hdr *nd_opt;
char *lladdr;
ln = nd6_lookup(nexthop, ifp, false);
if (ln == NULL)
goto nolladdropt;
len = sizeof(*nd_opt) + ifp->if_addrlen;
len = (len + 7) & ~7; /* round by 8 */
pad = len - (sizeof(*nd_opt) + ifp->if_addrlen);
/* safety check */
if (len + (p - (u_char *)ip6) > maxlen) {
LLE_RUNLOCK(ln);
goto nolladdropt;
}
if (ln->la_flags & LLE_VALID) {
nd_opt = (struct nd_opt_hdr *)p;
nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
nd_opt->nd_opt_len = len >> 3;
lladdr = (char *)(nd_opt + 1);
memcpy(lladdr, &ln->ll_addr, ifp->if_addrlen);
memset(lladdr + ifp->if_addrlen, 0, pad);
p += len;
}
LLE_RUNLOCK(ln);
}
nolladdropt:
m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
/* just to be safe */
if (m0->m_flags & M_DECRYPTED)
goto noredhdropt;
if (p - (u_char *)ip6 > maxlen)
goto noredhdropt;
{
/* redirected header option */
int len;
struct nd_opt_rd_hdr *nd_opt_rh;
/*
* compute the maximum size for icmp6 redirect header option.
* XXX room for auth header?
*/
len = maxlen - (p - (u_char *)ip6);
len &= ~7;
if (len < sizeof(*nd_opt_rh)) {
goto noredhdropt;
}
/*
* Redirected header option spec (RFC2461 4.6.3) talks nothing
* about padding/truncate rule for the original IP packet.
* From the discussion on IPv6imp in Feb 1999,
* the consensus was:
* - "attach as much as possible" is the goal
* - pad if not aligned (original size can be guessed by
* original ip6 header)
* Following code adds the padding if it is simple enough,
* and truncates if not.
*/
if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) {
/* not enough room, truncate */
m_adj(m0, (len - sizeof(*nd_opt_rh)) -
m0->m_pkthdr.len);
} else {
/*
* enough room, truncate if not aligned.
* we don't pad here for simplicity.
*/
int extra;
extra = m0->m_pkthdr.len % 8;
if (extra) {
/* truncate */
m_adj(m0, -extra);
}
len = m0->m_pkthdr.len + sizeof(*nd_opt_rh);
}
nd_opt_rh = (struct nd_opt_rd_hdr *)p;
memset(nd_opt_rh, 0, sizeof(*nd_opt_rh));
nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER;
nd_opt_rh->nd_opt_rh_len = len >> 3;
p += sizeof(*nd_opt_rh);
m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
/* connect m0 to m */
m->m_pkthdr.len += m0->m_pkthdr.len;
m_cat(m, m0);
m0 = NULL;
}
noredhdropt:
if (m0) {
m_freem(m0);
m0 = NULL;
}
/* XXX: clear embedded link IDs in the inner header */
in6_clearscope(&sip6->ip6_src);
in6_clearscope(&sip6->ip6_dst);
in6_clearscope(&nd_rd->nd_rd_target);
in6_clearscope(&nd_rd->nd_rd_dst);
ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
nd_rd->nd_rd_cksum = 0;
nd_rd->nd_rd_cksum =
in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen));
/* send the packet to outside... */
if (ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL) != 0)
icmp6_ifstat_inc(ifp, ifs6_out_error);
icmp6_ifstat_inc(ifp, ifs6_out_msg);
icmp6_ifstat_inc(ifp, ifs6_out_redirect);
ICMP6_STATINC(ICMP6_STAT_OUTHIST + ND_REDIRECT);
return;
fail:
if (m)
m_freem(m);
if (m0)
m_freem(m0);
}
/*
* ICMPv6 socket option processing.
*/
int
icmp6_ctloutput(int op, struct socket *so, struct sockopt *sopt)
{
int error = 0;
struct inpcb *inp = sotoinpcb(so);
if (sopt->sopt_level != IPPROTO_ICMPV6)
return rip6_ctloutput(op, so, sopt);
switch (op) {
case PRCO_SETOPT:
switch (sopt->sopt_name) {
case ICMP6_FILTER:
{
struct icmp6_filter fil;
error = sockopt_get(sopt, &fil, sizeof(fil));
if (error)
break;
memcpy(in6p_icmp6filt(inp), &fil,
sizeof(struct icmp6_filter));
error = 0;
break;
}
default:
error = ENOPROTOOPT;
break;
}
break;
case PRCO_GETOPT:
switch (sopt->sopt_name) {
case ICMP6_FILTER:
{
if (in6p_icmp6filt(inp) == NULL) {
error = EINVAL;
break;
}
error = sockopt_set(sopt, in6p_icmp6filt(inp),
sizeof(struct icmp6_filter));
break;
}
default:
error = ENOPROTOOPT;
break;
}
break;
}
return error;
}
/*
* Perform rate limit check.
* Returns 0 if it is okay to send the icmp6 packet.
* Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate
* limitation.
*
* XXX per-destination/type check necessary?
*/
static int
icmp6_ratelimit(
const struct in6_addr *dst, /* not used at this moment */
const int type, /* not used at this moment */
const int code) /* not used at this moment */
{
int ret;
ret = 0; /* okay to send */
/* PPS limit */
if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count,
icmp6errppslim)) {
/* The packet is subject to rate limit */
ret++;
}
return ret;
}
static struct rtentry *
icmp6_mtudisc_clone(struct sockaddr *dst)
{
struct rtentry *rt;
int error;
rt = rtalloc1(dst, 1);
if (rt == NULL)
return NULL;
/* If we didn't get a host route, allocate one */
if ((rt->rt_flags & RTF_HOST) == 0) {
struct rtentry *nrt;
error = rtrequest(RTM_ADD, dst, rt->rt_gateway, NULL,
RTF_GATEWAY | RTF_HOST | RTF_DYNAMIC, &nrt);
if (error) {
rt_unref(rt);
return NULL;
}
nrt->rt_rmx = rt->rt_rmx;
rt_newmsg_dynamic(RTM_ADD, nrt);
rt_unref(rt);
rt = nrt;
}
mutex_enter(&icmp6_mtx);
error = rt_timer_add(rt, icmp6_mtudisc_timeout,
icmp6_mtudisc_timeout_q);
mutex_exit(&icmp6_mtx);
if (error) {
rt_unref(rt);
return NULL;
}
return rt; /* caller need to call rtfree() */
}
static void
icmp6_mtudisc_timeout(struct rtentry *rt, struct rttimer *r)
{
struct rtentry *retrt;
KASSERT(rt != NULL);
rt_assert_referenced(rt);
if ((rt->rt_flags & (RTF_DYNAMIC | RTF_HOST)) ==
(RTF_DYNAMIC | RTF_HOST)) {
rtrequest(RTM_DELETE, rt_getkey(rt),
rt->rt_gateway, rt_mask(rt), rt->rt_flags, &retrt);
rt_newmsg_dynamic(RTM_DELETE, retrt);
rt_unref(rt);
rt_free(retrt);
} else {
if (!(rt->rt_rmx.rmx_locks & RTV_MTU))
rt->rt_rmx.rmx_mtu = 0;
}
}
static void
icmp6_redirect_timeout(struct rtentry *rt, struct rttimer *r)
{
struct rtentry *retrt;
KASSERT(rt != NULL);
rt_assert_referenced(rt);
if ((rt->rt_flags & (RTF_GATEWAY | RTF_DYNAMIC | RTF_HOST)) ==
(RTF_GATEWAY | RTF_DYNAMIC | RTF_HOST)) {
rtrequest(RTM_DELETE, rt_getkey(rt),
rt->rt_gateway, rt_mask(rt), rt->rt_flags, &retrt);
rt_newmsg_dynamic(RTM_DELETE, retrt);
rt_unref(rt);
rt_free(retrt);
}
}
#ifdef COMPAT_90
/*
* sysctl helper routine for the net.inet6.icmp6.nd6 nodes. silly?
*/
static int
sysctl_net_inet6_icmp6_nd6(SYSCTLFN_ARGS)
{
(void)&name;
(void)&l;
(void)&oname;
if (namelen != 0)
return (EINVAL);
return (nd6_sysctl(rnode->sysctl_num, oldp, oldlenp,
/*XXXUNCONST*/
__UNCONST(newp), newlen));
}
#endif
static int
sysctl_net_inet6_icmp6_stats(SYSCTLFN_ARGS)
{
return (NETSTAT_SYSCTL(icmp6stat_percpu, ICMP6_NSTATS));
}
static int
sysctl_net_inet6_icmp6_redirtimeout(SYSCTLFN_ARGS)
{
int error, tmp;
struct sysctlnode node;
mutex_enter(&icmp6_mtx);
node = *rnode;
node.sysctl_data = &tmp;
tmp = icmp6_redirtimeout;
error = sysctl_lookup(SYSCTLFN_CALL(&node));
if (error || newp == NULL)
goto out;
if (tmp < 0) {
error = EINVAL;
goto out;
}
icmp6_redirtimeout = tmp;
if (icmp6_redirect_timeout_q != NULL) {
if (icmp6_redirtimeout == 0) {
rt_timer_queue_destroy(icmp6_redirect_timeout_q);
} else {
rt_timer_queue_change(icmp6_redirect_timeout_q,
icmp6_redirtimeout);
}
} else if (icmp6_redirtimeout > 0) {
icmp6_redirect_timeout_q =
rt_timer_queue_create(icmp6_redirtimeout);
}
error = 0;
out:
mutex_exit(&icmp6_mtx);
return error;
}
static void
sysctl_net_inet6_icmp6_setup(struct sysctllog **clog)
{
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_NODE, "inet6", NULL,
NULL, 0, NULL, 0,
CTL_NET, PF_INET6, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_NODE, "icmp6",
SYSCTL_DESCR("ICMPv6 related settings"),
NULL, 0, NULL, 0,
CTL_NET, PF_INET6, IPPROTO_ICMPV6, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_STRUCT, "stats",
SYSCTL_DESCR("ICMPv6 transmission statistics"),
sysctl_net_inet6_icmp6_stats, 0, NULL, 0,
CTL_NET, PF_INET6, IPPROTO_ICMPV6,
ICMPV6CTL_STATS, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "rediraccept",
SYSCTL_DESCR("Accept and process redirect messages"),
NULL, 0, &icmp6_rediraccept, 0,
CTL_NET, PF_INET6, IPPROTO_ICMPV6,
ICMPV6CTL_REDIRACCEPT, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "redirtimeout",
SYSCTL_DESCR("Redirect generated route lifetime"),
sysctl_net_inet6_icmp6_redirtimeout, 0,
&icmp6_redirtimeout, 0,
CTL_NET, PF_INET6, IPPROTO_ICMPV6,
ICMPV6CTL_REDIRTIMEOUT, CTL_EOL);
#if 0 /* obsoleted */
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "errratelimit", NULL,
NULL, 0, &icmp6_errratelimit, 0,
CTL_NET, PF_INET6, IPPROTO_ICMPV6,
ICMPV6CTL_ERRRATELIMIT, CTL_EOL);
#endif
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "nd6_prune",
SYSCTL_DESCR("Neighbor discovery prune interval"),
NULL, 0, &nd6_prune, 0,
CTL_NET, PF_INET6, IPPROTO_ICMPV6,
ICMPV6CTL_ND6_PRUNE, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "nd6_delay",
SYSCTL_DESCR("First probe delay time"),
NULL, 0, &nd6_nd_domain.nd_delay, 0,
CTL_NET, PF_INET6, IPPROTO_ICMPV6,
ICMPV6CTL_ND6_DELAY, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "nd6_mmaxtries",
SYSCTL_DESCR("Number of multicast discovery attempts"),
NULL, 0, &nd6_nd_domain.nd_mmaxtries, 0,
CTL_NET, PF_INET6, IPPROTO_ICMPV6,
ICMPV6CTL_ND6_MMAXTRIES, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "nd6_umaxtries",
SYSCTL_DESCR("Number of unicast discovery attempts"),
NULL, 0, &nd6_nd_domain.nd_umaxtries, 0,
CTL_NET, PF_INET6, IPPROTO_ICMPV6,
ICMPV6CTL_ND6_UMAXTRIES, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "nd6_maxnudhint",
SYSCTL_DESCR("Maximum neighbor unreachable hint count"),
NULL, 0, &nd6_nd_domain.nd_maxnudhint, 0,
CTL_NET, PF_INET6, IPPROTO_ICMPV6,
ICMPV6CTL_ND6_MAXNUDHINT, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "maxqueuelen",
SYSCTL_DESCR("max packet queue len for a unresolved ND"),
NULL, 1, &nd6_nd_domain.nd_maxqueuelen, 0,
CTL_NET, PF_INET6, IPPROTO_ICMPV6,
ICMPV6CTL_ND6_MAXQLEN, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "nd6_useloopback",
SYSCTL_DESCR("Use loopback interface for local traffic"),
NULL, 0, &nd6_useloopback, 0,
CTL_NET, PF_INET6, IPPROTO_ICMPV6,
ICMPV6CTL_ND6_USELOOPBACK, CTL_EOL);
#if 0 /* obsoleted */
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "nd6_proxyall", NULL,
NULL, 0, &nd6_proxyall, 0,
CTL_NET, PF_INET6, IPPROTO_ICMPV6,
ICMPV6CTL_ND6_PROXYALL, CTL_EOL);
#endif
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "nodeinfo",
SYSCTL_DESCR("Respond to node information requests"),
NULL, 0, &icmp6_nodeinfo, 0,
CTL_NET, PF_INET6, IPPROTO_ICMPV6,
ICMPV6CTL_NODEINFO, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "errppslimit",
SYSCTL_DESCR("Maximum ICMP errors sent per second"),
NULL, 0, &icmp6errppslim, 0,
CTL_NET, PF_INET6, IPPROTO_ICMPV6,
ICMPV6CTL_ERRPPSLIMIT, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "mtudisc_hiwat",
SYSCTL_DESCR("Low mark on MTU Discovery route timers"),
NULL, 0, &icmp6_mtudisc_hiwat, 0,
CTL_NET, PF_INET6, IPPROTO_ICMPV6,
ICMPV6CTL_MTUDISC_HIWAT, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "mtudisc_lowat",
SYSCTL_DESCR("Low mark on MTU Discovery route timers"),
NULL, 0, &icmp6_mtudisc_lowat, 0,
CTL_NET, PF_INET6, IPPROTO_ICMPV6,
ICMPV6CTL_MTUDISC_LOWAT, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "nd6_debug",
SYSCTL_DESCR("Enable neighbor discovery debug output"),
NULL, 0, &nd6_debug, 0,
CTL_NET, PF_INET6, IPPROTO_ICMPV6,
ICMPV6CTL_ND6_DEBUG, CTL_EOL);
#ifdef COMPAT_90
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_STRUCT, "nd6_drlist",
SYSCTL_DESCR("Default router list"),
sysctl_net_inet6_icmp6_nd6, 0, NULL, 0,
CTL_NET, PF_INET6, IPPROTO_ICMPV6,
OICMPV6CTL_ND6_DRLIST, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_STRUCT, "nd6_prlist",
SYSCTL_DESCR("Prefix list"),
sysctl_net_inet6_icmp6_nd6, 0, NULL, 0,
CTL_NET, PF_INET6, IPPROTO_ICMPV6,
OICMPV6CTL_ND6_PRLIST, CTL_EOL);
#endif
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_BOOL, "reflect_pmtu",
SYSCTL_DESCR("Use path MTU Discovery for icmpv6 reflect"),
NULL, 0, &icmp6_reflect_pmtu, 0,
CTL_NET, PF_INET6, IPPROTO_ICMPV6,
ICMPV6CTL_REFLECT_PMTU, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_BOOL, "dynamic_rt_msg",
SYSCTL_DESCR("Send routing message for RTF_DYNAMIC"),
NULL, 0, &icmp6_dynamic_rt_msg, 0,
CTL_NET, PF_INET6, IPPROTO_ICMPV6,
ICMPV6CTL_DYNAMIC_RT_MSG, CTL_EOL);
}
void
icmp6_statinc(u_int stat)
{
KASSERT(stat < ICMP6_NSTATS);
ICMP6_STATINC(stat);
}
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