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code.illumos.org / illumos-gate / 44b099c4d944a196d124a02c7403ad891223139e / . / usr / src / uts / common / inet / ip / ip_output.c
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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2010 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/* Copyright (c) 1990 Mentat Inc. */
#include <sys/types.h>
#include <sys/stream.h>
#include <sys/strsubr.h>
#include <sys/dlpi.h>
#include <sys/strsun.h>
#include <sys/zone.h>
#include <sys/ddi.h>
#include <sys/sunddi.h>
#include <sys/cmn_err.h>
#include <sys/debug.h>
#include <sys/atomic.h>
#include <sys/systm.h>
#include <sys/param.h>
#include <sys/kmem.h>
#include <sys/sdt.h>
#include <sys/socket.h>
#include <sys/mac.h>
#include <net/if.h>
#include <net/if_arp.h>
#include <net/route.h>
#include <sys/sockio.h>
#include <netinet/in.h>
#include <net/if_dl.h>
#include <inet/common.h>
#include <inet/mi.h>
#include <inet/mib2.h>
#include <inet/nd.h>
#include <inet/arp.h>
#include <inet/snmpcom.h>
#include <inet/kstatcom.h>
#include <netinet/igmp_var.h>
#include <netinet/ip6.h>
#include <netinet/icmp6.h>
#include <netinet/sctp.h>
#include <inet/ip.h>
#include <inet/ip_impl.h>
#include <inet/ip6.h>
#include <inet/ip6_asp.h>
#include <inet/tcp.h>
#include <inet/ip_multi.h>
#include <inet/ip_if.h>
#include <inet/ip_ire.h>
#include <inet/ip_ftable.h>
#include <inet/ip_rts.h>
#include <inet/optcom.h>
#include <inet/ip_ndp.h>
#include <inet/ip_listutils.h>
#include <netinet/igmp.h>
#include <netinet/ip_mroute.h>
#include <inet/ipp_common.h>
#include <net/pfkeyv2.h>
#include <inet/sadb.h>
#include <inet/ipsec_impl.h>
#include <inet/ipdrop.h>
#include <inet/ip_netinfo.h>
#include <sys/pattr.h>
#include <inet/ipclassifier.h>
#include <inet/sctp_ip.h>
#include <inet/sctp/sctp_impl.h>
#include <inet/udp_impl.h>
#include <sys/sunddi.h>
#include <sys/tsol/label.h>
#include <sys/tsol/tnet.h>
#include <sys/clock_impl.h> /* For LBOLT_FASTPATH{,64} */
#ifdef DEBUG
extern boolean_t skip_sctp_cksum;
#endif
static int ip_verify_nce(mblk_t *, ip_xmit_attr_t *);
static int ip_verify_dce(mblk_t *, ip_xmit_attr_t *);
static boolean_t ip_verify_lso(ill_t *, ip_xmit_attr_t *);
static boolean_t ip_verify_zcopy(ill_t *, ip_xmit_attr_t *);
static void ip_output_simple_broadcast(ip_xmit_attr_t *, mblk_t *);
/*
* There are two types of output functions for IP used for different
* purposes:
* - ip_output_simple() is when sending ICMP errors, TCP resets, etc when there
* is no context in the form of a conn_t. However, there is a
* ip_xmit_attr_t that the callers use to influence interface selection
* (needed for ICMP echo as well as IPv6 link-locals) and IPsec.
*
* - conn_ip_output() is used when sending packets with a conn_t and
* ip_set_destination has been called to cache information. In that case
* various socket options are recorded in the ip_xmit_attr_t and should
* be taken into account.
*/
/*
* The caller *must* have called conn_connect() or ip_attr_connect()
* before calling conn_ip_output(). The caller needs to redo that each time
* the destination IP address or port changes, as well as each time there is
* a change to any socket option that would modify how packets are routed out
* of the box (e.g., SO_DONTROUTE, IP_NEXTHOP, IP_BOUND_IF).
*
* The ULP caller has to serialize the use of a single ip_xmit_attr_t.
* We assert for that here.
*/
int
conn_ip_output(mblk_t *mp, ip_xmit_attr_t *ixa)
{
iaflags_t ixaflags = ixa->ixa_flags;
ire_t *ire;
nce_t *nce;
dce_t *dce;
ill_t *ill;
ip_stack_t *ipst = ixa->ixa_ipst;
int error;
/* We defer ipIfStatsHCOutRequests until an error or we have an ill */
ASSERT(ixa->ixa_ire != NULL);
/* Note there is no ixa_nce when reject and blackhole routes */
ASSERT(ixa->ixa_dce != NULL); /* Could be default dce */
#ifdef DEBUG
ASSERT(ixa->ixa_curthread == NULL);
ixa->ixa_curthread = curthread;
#endif
/*
* Even on labeled systems we can have a NULL ixa_tsl e.g.,
* for IGMP/MLD traffic.
*/
ire = ixa->ixa_ire;
/*
* If the ULP says the (old) IRE resulted in reachability we
* record this before determine whether to use a new IRE.
* No locking for performance reasons.
*/
if (ixaflags & IXAF_REACH_CONF)
ire->ire_badcnt = 0;
/*
* Has routing changed since we cached the results of the lookup?
*
* This check captures all of:
* - the cached ire being deleted (by means of the special
* IRE_GENERATION_CONDEMNED)
* - A potentially better ire being added (ire_generation being
* increased)
* - A deletion of the nexthop ire that was used when we did the
* lookup.
* - An addition of a potentially better nexthop ire.
* The last two are handled by walking and increasing the generation
* number on all dependant IREs in ire_flush_cache().
*
* The check also handles all cases of RTF_REJECT and RTF_BLACKHOLE
* since we ensure that each time we set ixa_ire to such an IRE we
* make sure the ixa_ire_generation does not match (by using
* IRE_GENERATION_VERIFY).
*/
if (ire->ire_generation != ixa->ixa_ire_generation) {
error = ip_verify_ire(mp, ixa);
if (error != 0) {
ip_drop_output("ipIfStatsOutDiscards - verify ire",
mp, NULL);
goto drop;
}
ire = ixa->ixa_ire;
ASSERT(ire != NULL);
if (ire->ire_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
#ifdef DEBUG
ASSERT(ixa->ixa_curthread == curthread);
ixa->ixa_curthread = NULL;
#endif
ire->ire_ob_pkt_count++;
/* ixa_dce might be condemned; use default one */
return ((ire->ire_sendfn)(ire, mp, mp->b_rptr, ixa,
&ipst->ips_dce_default->dce_ident));
}
/*
* If the ncec changed then ip_verify_ire already set
* ixa->ixa_dce_generation = DCE_GENERATION_VERIFY;
* so we can recheck the interface mtu.
*/
/*
* Note that ire->ire_generation could already have changed.
* We catch that next time we send a packet.
*/
}
/*
* No need to lock access to ixa_nce since the ip_xmit_attr usage
* is single threaded.
*/
ASSERT(ixa->ixa_nce != NULL);
nce = ixa->ixa_nce;
if (nce->nce_is_condemned) {
error = ip_verify_nce(mp, ixa);
/*
* In case ZEROCOPY capability become not available, we
* copy the message and free the original one. We might
* be copying more data than needed but it doesn't hurt
* since such change rarely happens.
*/
switch (error) {
case 0:
break;
case ENOTSUP: { /* ZEROCOPY */
mblk_t *nmp;
if ((nmp = copymsg(mp)) != NULL) {
freemsg(mp);
mp = nmp;
break;
}
/* FALLTHROUGH */
}
default:
ip_drop_output("ipIfStatsOutDiscards - verify nce",
mp, NULL);
goto drop;
}
ire = ixa->ixa_ire;
ASSERT(ire != NULL);
if (ire->ire_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
#ifdef DEBUG
ASSERT(ixa->ixa_curthread == curthread);
ixa->ixa_curthread = NULL;
#endif
ire->ire_ob_pkt_count++;
/* ixa_dce might be condemned; use default one */
return ((ire->ire_sendfn)(ire, mp, mp->b_rptr,
ixa, &ipst->ips_dce_default->dce_ident));
}
ASSERT(ixa->ixa_nce != NULL);
nce = ixa->ixa_nce;
/*
* Note that some other event could already have made
* the new nce condemned. We catch that next time we
* try to send a packet.
*/
}
/*
* If there is no per-destination dce_t then we have a reference to
* the default dce_t (which merely contains the dce_ipid).
* The generation check captures both the introduction of a
* per-destination dce_t (e.g., due to ICMP packet too big) and
* any change to the per-destination dce (including it becoming
* condemned by use of the special DCE_GENERATION_CONDEMNED).
*/
dce = ixa->ixa_dce;
/*
* To avoid a periodic timer to increase the path MTU we
* look at dce_last_change_time each time we send a packet.
*/
if (dce->dce_flags & DCEF_PMTU) {
int64_t now = LBOLT_FASTPATH64;
if ((TICK_TO_SEC(now) - dce->dce_last_change_time >
ipst->ips_ip_pathmtu_interval)) {
/*
* Older than 20 minutes. Drop the path MTU information.
* Since the path MTU changes as a result of this,
* twiddle ixa_dce_generation to make us go through the
* dce verification code in conn_ip_output.
*/
mutex_enter(&dce->dce_lock);
dce->dce_flags &= ~(DCEF_PMTU|DCEF_TOO_SMALL_PMTU);
dce->dce_last_change_time = TICK_TO_SEC(now);
mutex_exit(&dce->dce_lock);
dce_increment_generation(dce);
}
}
if (dce->dce_generation != ixa->ixa_dce_generation) {
error = ip_verify_dce(mp, ixa);
if (error != 0) {
ip_drop_output("ipIfStatsOutDiscards - verify dce",
mp, NULL);
goto drop;
}
dce = ixa->ixa_dce;
/*
* Note that some other event could already have made the
* new dce's generation number change.
* We catch that next time we try to send a packet.
*/
}
ill = nce->nce_ill;
/*
* An initial ixa_fragsize was set in ip_set_destination
* and we update it if any routing changes above.
* A change to ill_mtu with ifconfig will increase all dce_generation
* so that we will detect that with the generation check.
*/
/*
* Caller needs to make sure IXAF_VERIFY_SRC is not set if
* conn_unspec_src.
*/
if ((ixaflags & IXAF_VERIFY_SOURCE) &&
ixa->ixa_src_generation != ipst->ips_src_generation) {
/* Check if the IP source is still assigned to the host. */
uint_t gen;
if (!ip_verify_src(mp, ixa, &gen)) {
/* Don't send a packet with a source that isn't ours */
error = EADDRNOTAVAIL;
ip_drop_output("ipIfStatsOutDiscards - invalid src",
mp, NULL);
goto drop;
}
/* The source is still valid - update the generation number */
ixa->ixa_src_generation = gen;
}
/*
* We don't have an IRE when we fragment, hence ire_ob_pkt_count
* can only count the use prior to fragmentation. However the MIB
* counters on the ill will be incremented in post fragmentation.
*/
ire->ire_ob_pkt_count++;
BUMP_MIB(ill->ill_ip_mib, ipIfStatsHCOutRequests);
/*
* Based on ire_type and ire_flags call one of:
* ire_send_local_v* - for IRE_LOCAL and IRE_LOOPBACK
* ire_send_multirt_v* - if RTF_MULTIRT
* ire_send_noroute_v* - if RTF_REJECT or RTF_BLACHOLE
* ire_send_multicast_v* - for IRE_MULTICAST
* ire_send_broadcast_v4 - for IRE_BROADCAST
* ire_send_wire_v* - for the rest.
*/
#ifdef DEBUG
ASSERT(ixa->ixa_curthread == curthread);
ixa->ixa_curthread = NULL;
#endif
return ((ire->ire_sendfn)(ire, mp, mp->b_rptr, ixa, &dce->dce_ident));
drop:
if (ixaflags & IXAF_IS_IPV4) {
BUMP_MIB(&ipst->ips_ip_mib, ipIfStatsHCOutRequests);
BUMP_MIB(&ipst->ips_ip_mib, ipIfStatsOutDiscards);
} else {
BUMP_MIB(&ipst->ips_ip6_mib, ipIfStatsHCOutRequests);
BUMP_MIB(&ipst->ips_ip6_mib, ipIfStatsOutDiscards);
}
freemsg(mp);
#ifdef DEBUG
ASSERT(ixa->ixa_curthread == curthread);
ixa->ixa_curthread = NULL;
#endif
return (error);
}
/*
* Handle both IPv4 and IPv6. Sets the generation number
* to allow the caller to know when to call us again.
* Returns true if the source address in the packet is a valid source.
* We handle callers which try to send with a zero address (since we only
* get here if UNSPEC_SRC is not set).
*/
boolean_t
ip_verify_src(mblk_t *mp, ip_xmit_attr_t *ixa, uint_t *generationp)
{
ip_stack_t *ipst = ixa->ixa_ipst;
/*
* Need to grab the generation number before we check to
* avoid a race with a change to the set of local addresses.
* No lock needed since the thread which updates the set of local
* addresses use ipif/ill locks and exit those (hence a store memory
* barrier) before doing the atomic increase of ips_src_generation.
*/
if (generationp != NULL)
*generationp = ipst->ips_src_generation;
if (ixa->ixa_flags & IXAF_IS_IPV4) {
ipha_t *ipha = (ipha_t *)mp->b_rptr;
if (ipha->ipha_src == INADDR_ANY)
return (B_FALSE);
return (ip_laddr_verify_v4(ipha->ipha_src, ixa->ixa_zoneid,
ipst, B_FALSE) != IPVL_BAD);
} else {
ip6_t *ip6h = (ip6_t *)mp->b_rptr;
uint_t scopeid;
if (IN6_IS_ADDR_UNSPECIFIED(&ip6h->ip6_src))
return (B_FALSE);
if (ixa->ixa_flags & IXAF_SCOPEID_SET)
scopeid = ixa->ixa_scopeid;
else
scopeid = 0;
return (ip_laddr_verify_v6(&ip6h->ip6_src, ixa->ixa_zoneid,
ipst, B_FALSE, scopeid) != IPVL_BAD);
}
}
/*
* Handle both IPv4 and IPv6. Reverify/recalculate the IRE to use.
*/
int
ip_verify_ire(mblk_t *mp, ip_xmit_attr_t *ixa)
{
uint_t gen;
ire_t *ire;
nce_t *nce;
int error;
boolean_t multirt = B_FALSE;
/*
* Redo ip_select_route.
* Need to grab generation number as part of the lookup to
* avoid race.
*/
error = 0;
ire = ip_select_route_pkt(mp, ixa, &gen, &error, &multirt);
ASSERT(ire != NULL); /* IRE_NOROUTE if none found */
if (error != 0) {
ire_refrele(ire);
return (error);
}
if (ixa->ixa_ire != NULL)
ire_refrele_notr(ixa->ixa_ire);
#ifdef DEBUG
ire_refhold_notr(ire);
ire_refrele(ire);
#endif
ixa->ixa_ire = ire;
ixa->ixa_ire_generation = gen;
if (multirt) {
if (ixa->ixa_flags & IXAF_IS_IPV4)
ixa->ixa_postfragfn = ip_postfrag_multirt_v4;
else
ixa->ixa_postfragfn = ip_postfrag_multirt_v6;
ixa->ixa_flags |= IXAF_MULTIRT_MULTICAST;
} else {
ixa->ixa_postfragfn = ire->ire_postfragfn;
ixa->ixa_flags &= ~IXAF_MULTIRT_MULTICAST;
}
/*
* Don't look for an nce for reject or blackhole.
* They have ire_generation set to IRE_GENERATION_VERIFY which
* makes conn_ip_output avoid references to ixa_nce.
*/
if (ire->ire_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
ASSERT(ixa->ixa_ire_generation == IRE_GENERATION_VERIFY);
ixa->ixa_dce_generation = DCE_GENERATION_VERIFY;
return (0);
}
/* The NCE could now be different */
nce = ire_to_nce_pkt(ire, mp);
if (nce == NULL) {
/*
* Allocation failure. Make sure we redo ire/nce selection
* next time we send.
*/
ixa->ixa_ire_generation = IRE_GENERATION_VERIFY;
ixa->ixa_dce_generation = DCE_GENERATION_VERIFY;
return (ENOBUFS);
}
if (nce == ixa->ixa_nce) {
/* No change */
nce_refrele(nce);
return (0);
}
/*
* Since the path MTU might change as a result of this
* route change, we twiddle ixa_dce_generation to
* make conn_ip_output go through the ip_verify_dce code.
*/
ixa->ixa_dce_generation = DCE_GENERATION_VERIFY;
if (ixa->ixa_nce != NULL)
nce_refrele(ixa->ixa_nce);
ixa->ixa_nce = nce;
return (0);
}
/*
* Handle both IPv4 and IPv6. Reverify/recalculate the NCE to use.
*/
static int
ip_verify_nce(mblk_t *mp, ip_xmit_attr_t *ixa)
{
ire_t *ire = ixa->ixa_ire;
nce_t *nce;
int error = 0;
ipha_t *ipha = NULL;
ip6_t *ip6h = NULL;
if (ire->ire_ipversion == IPV4_VERSION)
ipha = (ipha_t *)mp->b_rptr;
else
ip6h = (ip6_t *)mp->b_rptr;
nce = ire_handle_condemned_nce(ixa->ixa_nce, ire, ipha, ip6h, B_TRUE);
if (nce == NULL) {
/* Try to find a better ire */
return (ip_verify_ire(mp, ixa));
}
/*
* The hardware offloading capabilities, for example LSO, of the
* interface might have changed, so do sanity verification here.
*/
if (ixa->ixa_flags & IXAF_VERIFY_LSO) {
if (!ip_verify_lso(nce->nce_ill, ixa)) {
ASSERT(ixa->ixa_notify != NULL);
ixa->ixa_notify(ixa->ixa_notify_cookie, ixa,
IXAN_LSO, 0);
error = ENOTSUP;
}
}
/*
* Verify ZEROCOPY capability of underlying ill. Notify the ULP with
* any ZEROCOPY changes. In case ZEROCOPY capability is not available
* any more, return error so that conn_ip_output() can take care of
* the ZEROCOPY message properly. It's safe to continue send the
* message when ZEROCOPY newly become available.
*/
if (ixa->ixa_flags & IXAF_VERIFY_ZCOPY) {
if (!ip_verify_zcopy(nce->nce_ill, ixa)) {
ASSERT(ixa->ixa_notify != NULL);
ixa->ixa_notify(ixa->ixa_notify_cookie, ixa,
IXAN_ZCOPY, 0);
if ((ixa->ixa_flags & IXAF_ZCOPY_CAPAB) == 0)
error = ENOTSUP;
}
}
/*
* Since the path MTU might change as a result of this
* change, we twiddle ixa_dce_generation to
* make conn_ip_output go through the ip_verify_dce code.
*/
ixa->ixa_dce_generation = DCE_GENERATION_VERIFY;
nce_refrele(ixa->ixa_nce);
ixa->ixa_nce = nce;
return (error);
}
/*
* Handle both IPv4 and IPv6. Reverify/recalculate the DCE to use.
*/
static int
ip_verify_dce(mblk_t *mp, ip_xmit_attr_t *ixa)
{
dce_t *dce;
uint_t gen;
uint_t pmtu;
dce = dce_lookup_pkt(mp, ixa, &gen);
ASSERT(dce != NULL);
dce_refrele_notr(ixa->ixa_dce);
#ifdef DEBUG
dce_refhold_notr(dce);
dce_refrele(dce);
#endif
ixa->ixa_dce = dce;
ixa->ixa_dce_generation = gen;
/* Extract the (path) mtu from the dce, ncec_ill etc */
pmtu = ip_get_pmtu(ixa);
/*
* Tell ULP about PMTU changes - increase or decrease - by returning
* an error if IXAF_VERIFY_PMTU is set. In such case, ULP should update
* both ixa_pmtu and ixa_fragsize appropriately.
*
* If ULP doesn't set that flag then we need to update ixa_fragsize
* since routing could have changed the ill after after ixa_fragsize
* was set previously in the conn_ip_output path or in
* ip_set_destination.
*
* In case of LSO, ixa_fragsize might be greater than ixa_pmtu.
*
* In the case of a path MTU increase we send the packet after the
* notify to the ULP.
*/
if (ixa->ixa_flags & IXAF_VERIFY_PMTU) {
if (ixa->ixa_pmtu != pmtu) {
uint_t oldmtu = ixa->ixa_pmtu;
DTRACE_PROBE2(verify_pmtu, uint32_t, pmtu,
uint32_t, ixa->ixa_pmtu);
ASSERT(ixa->ixa_notify != NULL);
ixa->ixa_notify(ixa->ixa_notify_cookie, ixa,
IXAN_PMTU, pmtu);
if (pmtu < oldmtu)
return (EMSGSIZE);
}
} else {
ixa->ixa_fragsize = pmtu;
}
return (0);
}
/*
* Verify LSO usability. Keep the return value simple to indicate whether
* the LSO capability has changed. Handle both IPv4 and IPv6.
*/
static boolean_t
ip_verify_lso(ill_t *ill, ip_xmit_attr_t *ixa)
{
ill_lso_capab_t *lsoc = &ixa->ixa_lso_capab;
ill_lso_capab_t *new_lsoc = ill->ill_lso_capab;
if (ixa->ixa_flags & IXAF_LSO_CAPAB) {
/*
* Not unsable any more.
*/
if ((ixa->ixa_flags & IXAF_IPSEC_SECURE) ||
(ixa->ixa_ire->ire_type & (IRE_LOCAL | IRE_LOOPBACK)) ||
(ixa->ixa_ire->ire_flags & RTF_MULTIRT) ||
((ixa->ixa_flags & IXAF_IS_IPV4) ?
!ILL_LSO_TCP_IPV4_USABLE(ill) :
!ILL_LSO_TCP_IPV6_USABLE(ill))) {
ixa->ixa_flags &= ~IXAF_LSO_CAPAB;
return (B_FALSE);
}
/*
* Capability has changed, refresh the copy in ixa.
*/
if (lsoc->ill_lso_max != new_lsoc->ill_lso_max) {
*lsoc = *new_lsoc;
return (B_FALSE);
}
} else { /* Was not usable */
if (!(ixa->ixa_flags & IXAF_IPSEC_SECURE) &&
!(ixa->ixa_ire->ire_type & (IRE_LOCAL | IRE_LOOPBACK)) &&
!(ixa->ixa_ire->ire_flags & RTF_MULTIRT) &&
((ixa->ixa_flags & IXAF_IS_IPV4) ?
ILL_LSO_TCP_IPV4_USABLE(ill) :
ILL_LSO_TCP_IPV6_USABLE(ill))) {
*lsoc = *new_lsoc;
ixa->ixa_flags |= IXAF_LSO_CAPAB;
return (B_FALSE);
}
}
return (B_TRUE);
}
/*
* Verify ZEROCOPY usability. Keep the return value simple to indicate whether
* the ZEROCOPY capability has changed. Handle both IPv4 and IPv6.
*/
static boolean_t
ip_verify_zcopy(ill_t *ill, ip_xmit_attr_t *ixa)
{
if (ixa->ixa_flags & IXAF_ZCOPY_CAPAB) {
/*
* Not unsable any more.
*/
if ((ixa->ixa_flags & IXAF_IPSEC_SECURE) ||
(ixa->ixa_ire->ire_type & (IRE_LOCAL | IRE_LOOPBACK)) ||
(ixa->ixa_ire->ire_flags & RTF_MULTIRT) ||
!ILL_ZCOPY_USABLE(ill)) {
ixa->ixa_flags &= ~IXAF_ZCOPY_CAPAB;
return (B_FALSE);
}
} else { /* Was not usable */
if (!(ixa->ixa_flags & IXAF_IPSEC_SECURE) &&
!(ixa->ixa_ire->ire_type & (IRE_LOCAL | IRE_LOOPBACK)) &&
!(ixa->ixa_ire->ire_flags & RTF_MULTIRT) &&
ILL_ZCOPY_USABLE(ill)) {
ixa->ixa_flags |= IXAF_ZCOPY_CAPAB;
return (B_FALSE);
}
}
return (B_TRUE);
}
/*
* When there is no conn_t context, this will send a packet.
* The caller must *not* have called conn_connect() or ip_attr_connect()
* before calling ip_output_simple().
* Handles IPv4 and IPv6. Returns zero or an errno such as ENETUNREACH.
* Honors IXAF_SET_SOURCE.
*
* We acquire the ire and after calling ire_sendfn we release
* the hold on the ire. Ditto for the nce and dce.
*
* This assumes that the caller has set the following in ip_xmit_attr_t:
* ixa_tsl, ixa_zoneid, and ixa_ipst must always be set.
* If ixa_ifindex is non-zero it means send out that ill. (If it is
* an upper IPMP ill we load balance across the group; if a lower we send
* on that lower ill without load balancing.)
* IXAF_IS_IPV4 must be set correctly.
* If IXAF_IPSEC_SECURE is set then the ixa_ipsec_* fields must be set.
* If IXAF_NO_IPSEC is set we'd skip IPsec policy lookup.
* If neither of those two are set we do an IPsec policy lookup.
*
* We handle setting things like
* ixa_pktlen
* ixa_ip_hdr_length
* ixa->ixa_protocol
*
* The caller may set ixa_xmit_hint, which is used for ECMP selection and
* transmit ring selecting in GLD.
*
* The caller must do an ixa_cleanup() to release any IPsec references
* after we return.
*/
int
ip_output_simple(mblk_t *mp, ip_xmit_attr_t *ixa)
{
ts_label_t *effective_tsl = NULL;
int err;
ASSERT(ixa->ixa_ipst != NULL);
if (is_system_labeled()) {
ip_stack_t *ipst = ixa->ixa_ipst;
if (ixa->ixa_flags & IXAF_IS_IPV4) {
err = tsol_check_label_v4(ixa->ixa_tsl, ixa->ixa_zoneid,
&mp, CONN_MAC_DEFAULT, B_FALSE, ixa->ixa_ipst,
&effective_tsl);
} else {
err = tsol_check_label_v6(ixa->ixa_tsl, ixa->ixa_zoneid,
&mp, CONN_MAC_DEFAULT, B_FALSE, ixa->ixa_ipst,
&effective_tsl);
}
if (err != 0) {
ip2dbg(("tsol_check: label check failed (%d)\n", err));
BUMP_MIB(&ipst->ips_ip_mib, ipIfStatsHCOutRequests);
BUMP_MIB(&ipst->ips_ip_mib, ipIfStatsOutDiscards);
ip_drop_output("tsol_check_label", mp, NULL);
freemsg(mp);
return (err);
}
if (effective_tsl != NULL) {
/* Update the label */
ip_xmit_attr_replace_tsl(ixa, effective_tsl);
}
}
if (ixa->ixa_flags & IXAF_IS_IPV4)
return (ip_output_simple_v4(mp, ixa));
else
return (ip_output_simple_v6(mp, ixa));
}
int
ip_output_simple_v4(mblk_t *mp, ip_xmit_attr_t *ixa)
{
ipha_t *ipha;
ipaddr_t firsthop; /* In IP header */
ipaddr_t dst; /* End of source route, or ipha_dst if none */
ire_t *ire;
ipaddr_t setsrc; /* RTF_SETSRC */
int error;
ill_t *ill = NULL;
dce_t *dce = NULL;
nce_t *nce;
iaflags_t ixaflags = ixa->ixa_flags;
ip_stack_t *ipst = ixa->ixa_ipst;
boolean_t repeat = B_FALSE;
boolean_t multirt = B_FALSE;
int64_t now;
ipha = (ipha_t *)mp->b_rptr;
ASSERT(IPH_HDR_VERSION(ipha) == IPV4_VERSION);
/*
* Even on labeled systems we can have a NULL ixa_tsl e.g.,
* for IGMP/MLD traffic.
*/
/* Caller already set flags */
ASSERT(ixa->ixa_flags & IXAF_IS_IPV4);
ASSERT(ixa->ixa_nce == NULL);
ixa->ixa_pktlen = ntohs(ipha->ipha_length);
ASSERT(ixa->ixa_pktlen == msgdsize(mp));
ixa->ixa_ip_hdr_length = IPH_HDR_LENGTH(ipha);
ixa->ixa_protocol = ipha->ipha_protocol;
/*
* Assumes that source routed packets have already been massaged by
* the ULP (ip_massage_options) and as a result ipha_dst is the next
* hop in the source route. The final destination is used for IPsec
* policy and DCE lookup.
*/
firsthop = ipha->ipha_dst;
dst = ip_get_dst(ipha);
repeat_ire:
error = 0;
setsrc = INADDR_ANY;
ire = ip_select_route_v4(firsthop, ipha->ipha_src, ixa, NULL,
&setsrc, &error, &multirt);
ASSERT(ire != NULL); /* IRE_NOROUTE if none found */
if (error != 0) {
BUMP_MIB(&ipst->ips_ip_mib, ipIfStatsHCOutRequests);
BUMP_MIB(&ipst->ips_ip_mib, ipIfStatsOutDiscards);
ip_drop_output("ipIfStatsOutDiscards - select route", mp, NULL);
freemsg(mp);
goto done;
}
if (ire->ire_flags & (RTF_BLACKHOLE|RTF_REJECT)) {
/* ire_ill might be NULL hence need to skip some code */
if (ixaflags & IXAF_SET_SOURCE)
ipha->ipha_src = htonl(INADDR_LOOPBACK);
ixa->ixa_fragsize = IP_MAXPACKET;
ill = NULL;
nce = NULL;
ire->ire_ob_pkt_count++;
BUMP_MIB(&ipst->ips_ip_mib, ipIfStatsHCOutRequests);
/* No dce yet; use default one */
error = (ire->ire_sendfn)(ire, mp, ipha, ixa,
&ipst->ips_dce_default->dce_ident);
goto done;
}
/* Note that ipha_dst is only used for IRE_MULTICAST */
nce = ire_to_nce(ire, ipha->ipha_dst, NULL);
if (nce == NULL) {
/* Allocation failure? */
ip_drop_output("ire_to_nce", mp, ill);
freemsg(mp);
error = ENOBUFS;
goto done;
}
if (nce->nce_is_condemned) {
nce_t *nce1;
nce1 = ire_handle_condemned_nce(nce, ire, ipha, NULL, B_TRUE);
nce_refrele(nce);
if (nce1 == NULL) {
if (!repeat) {
/* Try finding a better IRE */
repeat = B_TRUE;
ire_refrele(ire);
goto repeat_ire;
}
/* Tried twice - drop packet */
BUMP_MIB(&ipst->ips_ip_mib, ipIfStatsOutDiscards);
ip_drop_output("No nce", mp, ill);
freemsg(mp);
error = ENOBUFS;
goto done;
}
nce = nce1;
}
/*
* For multicast with multirt we have a flag passed back from
* ire_lookup_multi_ill_v4 since we don't have an IRE for each
* possible multicast address.
* We also need a flag for multicast since we can't check
* whether RTF_MULTIRT is set in ixa_ire for multicast.
*/
if (multirt) {
ixa->ixa_postfragfn = ip_postfrag_multirt_v4;
ixa->ixa_flags |= IXAF_MULTIRT_MULTICAST;
} else {
ixa->ixa_postfragfn = ire->ire_postfragfn;
ixa->ixa_flags &= ~IXAF_MULTIRT_MULTICAST;
}
ASSERT(ixa->ixa_nce == NULL);
ixa->ixa_nce = nce;
/*
* Check for a dce_t with a path mtu.
*/
dce = dce_lookup_v4(dst, ipst, NULL);
ASSERT(dce != NULL);
if (!(ixaflags & IXAF_PMTU_DISCOVERY)) {
ixa->ixa_fragsize = ip_get_base_mtu(nce->nce_ill, ire);
} else if (dce->dce_flags & DCEF_PMTU) {
/*
* To avoid a periodic timer to increase the path MTU we
* look at dce_last_change_time each time we send a packet.
*/
now = ddi_get_lbolt64();
if (TICK_TO_SEC(now) - dce->dce_last_change_time >
ipst->ips_ip_pathmtu_interval) {
/*
* Older than 20 minutes. Drop the path MTU information.
*/
mutex_enter(&dce->dce_lock);
dce->dce_flags &= ~(DCEF_PMTU|DCEF_TOO_SMALL_PMTU);
dce->dce_last_change_time = TICK_TO_SEC(now);
mutex_exit(&dce->dce_lock);
dce_increment_generation(dce);
ixa->ixa_fragsize = ip_get_base_mtu(nce->nce_ill, ire);
} else {
uint_t fragsize;
fragsize = ip_get_base_mtu(nce->nce_ill, ire);
if (fragsize > dce->dce_pmtu)
fragsize = dce->dce_pmtu;
ixa->ixa_fragsize = fragsize;
}
} else {
ixa->ixa_fragsize = ip_get_base_mtu(nce->nce_ill, ire);
}
/*
* We use use ire_nexthop_ill (and not ncec_ill) to avoid the under ipmp
* interface for source address selection.
*/
ill = ire_nexthop_ill(ire);
if (ixaflags & IXAF_SET_SOURCE) {
ipaddr_t src;
/*
* We use the final destination to get
* correct selection for source routed packets
*/
/* If unreachable we have no ill but need some source */
if (ill == NULL) {
src = htonl(INADDR_LOOPBACK);
error = 0;
} else {
error = ip_select_source_v4(ill, setsrc, dst,
ixa->ixa_multicast_ifaddr, ixa->ixa_zoneid, ipst,
&src, NULL, NULL);
}
if (error != 0) {
BUMP_MIB(ill->ill_ip_mib, ipIfStatsHCOutRequests);
BUMP_MIB(ill->ill_ip_mib, ipIfStatsOutDiscards);
ip_drop_output("ipIfStatsOutDiscards - no source",
mp, ill);
freemsg(mp);
goto done;
}
ipha->ipha_src = src;
} else if (ixaflags & IXAF_VERIFY_SOURCE) {
/* Check if the IP source is assigned to the host. */
if (!ip_verify_src(mp, ixa, NULL)) {
/* Don't send a packet with a source that isn't ours */
BUMP_MIB(&ipst->ips_ip_mib, ipIfStatsHCOutRequests);
BUMP_MIB(&ipst->ips_ip_mib, ipIfStatsOutDiscards);
ip_drop_output("ipIfStatsOutDiscards - invalid source",
mp, ill);
freemsg(mp);
error = EADDRNOTAVAIL;
goto done;
}
}
/*
* Check against global IPsec policy to set the AH/ESP attributes.
* IPsec will set IXAF_IPSEC_* and ixa_ipsec_* as appropriate.
*/
if (!(ixaflags & (IXAF_NO_IPSEC|IXAF_IPSEC_SECURE))) {
ASSERT(ixa->ixa_ipsec_policy == NULL);
mp = ip_output_attach_policy(mp, ipha, NULL, NULL, ixa);
if (mp == NULL) {
/* MIB and ip_drop_packet already done */
return (EHOSTUNREACH); /* IPsec policy failure */
}
}
if (ill != NULL) {
BUMP_MIB(ill->ill_ip_mib, ipIfStatsHCOutRequests);
} else {
BUMP_MIB(&ipst->ips_ip_mib, ipIfStatsHCOutRequests);
}
/*
* We update the statistics on the most specific IRE i.e., the first
* one we found.
* We don't have an IRE when we fragment, hence ire_ob_pkt_count
* can only count the use prior to fragmentation. However the MIB
* counters on the ill will be incremented in post fragmentation.
*/
ire->ire_ob_pkt_count++;
/*
* Based on ire_type and ire_flags call one of:
* ire_send_local_v4 - for IRE_LOCAL and IRE_LOOPBACK
* ire_send_multirt_v4 - if RTF_MULTIRT
* ire_send_noroute_v4 - if RTF_REJECT or RTF_BLACHOLE
* ire_send_multicast_v4 - for IRE_MULTICAST
* ire_send_broadcast_v4 - for IRE_BROADCAST
* ire_send_wire_v4 - for the rest.
*/
error = (ire->ire_sendfn)(ire, mp, ipha, ixa, &dce->dce_ident);
done:
ire_refrele(ire);
if (dce != NULL)
dce_refrele(dce);
if (ill != NULL)
ill_refrele(ill);
if (ixa->ixa_nce != NULL)
nce_refrele(ixa->ixa_nce);
ixa->ixa_nce = NULL;
return (error);
}
/*
* ire_sendfn() functions.
* These functions use the following xmit_attr:
* - ixa_fragsize - read to determine whether or not to fragment
* - IXAF_IPSEC_SECURE - to determine whether or not to invoke IPsec
* - ixa_ipsec_* are used inside IPsec
* - IXAF_SET_SOURCE - replace IP source in broadcast case.
* - IXAF_LOOPBACK_COPY - for multicast and broadcast
*/
/*
* ire_sendfn for IRE_LOCAL and IRE_LOOPBACK
*
* The checks for restrict_interzone_loopback are done in ire_route_recursive.
*/
/* ARGSUSED4 */
int
ire_send_local_v4(ire_t *ire, mblk_t *mp, void *iph_arg,
ip_xmit_attr_t *ixa, uint32_t *identp)
{
ipha_t *ipha = (ipha_t *)iph_arg;
ip_stack_t *ipst = ixa->ixa_ipst;
ill_t *ill = ire->ire_ill;
ip_recv_attr_t iras; /* NOTE: No bzero for performance */
uint_t pktlen = ixa->ixa_pktlen;
/*
* No fragmentation, no nce, no application of IPsec,
* and no ipha_ident assignment.
*
* Note different order between IP provider and FW_HOOKS than in
* send_wire case.
*/
/*
* DTrace this as ip:::send. A packet blocked by FW_HOOKS will fire the
* send probe, but not the receive probe.
*/
DTRACE_IP7(send, mblk_t *, mp, conn_t *, NULL, void_ip_t *,
ipha, __dtrace_ipsr_ill_t *, ill, ipha_t *, ipha, ip6_t *, NULL,
int, 1);
if (HOOKS4_INTERESTED_LOOPBACK_OUT(ipst)) {
int error;
DTRACE_PROBE4(ip4__loopback__out__start, ill_t *, NULL,
ill_t *, ill, ipha_t *, ipha, mblk_t *, mp);
FW_HOOKS(ipst->ips_ip4_loopback_out_event,
ipst->ips_ipv4firewall_loopback_out,
NULL, ill, ipha, mp, mp, 0, ipst, error);
DTRACE_PROBE1(ip4__loopback__out__end, mblk_t *, mp);
if (mp == NULL)
return (error);
/*
* Even if the destination was changed by the filter we use the
* forwarding decision that was made based on the address
* in ip_output/ip_set_destination.
*/
/* Length could be different */
ipha = (ipha_t *)mp->b_rptr;
pktlen = ntohs(ipha->ipha_length);
}
/*
* If a callback is enabled then we need to know the
* source and destination zoneids for the packet. We already
* have those handy.
*/
if (ipst->ips_ip4_observe.he_interested) {
zoneid_t szone, dzone;
zoneid_t stackzoneid;
stackzoneid = netstackid_to_zoneid(
ipst->ips_netstack->netstack_stackid);
if (stackzoneid == GLOBAL_ZONEID) {
/* Shared-IP zone */
dzone = ire->ire_zoneid;
szone = ixa->ixa_zoneid;
} else {
szone = dzone = stackzoneid;
}
ipobs_hook(mp, IPOBS_HOOK_LOCAL, szone, dzone, ill, ipst);
}
/* Handle lo0 stats */
ipst->ips_loopback_packets++;
/* Map ixa to ira including IPsec policies */
ipsec_out_to_in(ixa, ill, &iras);
iras.ira_pktlen = pktlen;
if (!IS_SIMPLE_IPH(ipha)) {
ip_output_local_options(ipha, ipst);
iras.ira_flags |= IRAF_IPV4_OPTIONS;
}
if (HOOKS4_INTERESTED_LOOPBACK_IN(ipst)) {
int error;
DTRACE_PROBE4(ip4__loopback__in__start, ill_t *, ill,
ill_t *, NULL, ipha_t *, ipha, mblk_t *, mp);
FW_HOOKS(ipst->ips_ip4_loopback_in_event,
ipst->ips_ipv4firewall_loopback_in,
ill, NULL, ipha, mp, mp, 0, ipst, error);
DTRACE_PROBE1(ip4__loopback__in__end, mblk_t *, mp);
if (mp == NULL) {
ira_cleanup(&iras, B_FALSE);
return (error);
}
/*
* Even if the destination was changed by the filter we use the
* forwarding decision that was made based on the address
* in ip_output/ip_set_destination.
*/
/* Length could be different */
ipha = (ipha_t *)mp->b_rptr;
pktlen = iras.ira_pktlen = ntohs(ipha->ipha_length);
}
DTRACE_IP7(receive, mblk_t *, mp, conn_t *, NULL, void_ip_t *,
ipha, __dtrace_ipsr_ill_t *, ill, ipha_t *, ipha, ip6_t *, NULL,
int, 1);
ire->ire_ib_pkt_count++;
BUMP_MIB(ill->ill_ip_mib, ipIfStatsHCInReceives);
UPDATE_MIB(ill->ill_ip_mib, ipIfStatsHCInOctets, pktlen);
/* Destined to ire_zoneid - use that for fanout */
iras.ira_zoneid = ire->ire_zoneid;
if (is_system_labeled()) {
iras.ira_flags |= IRAF_SYSTEM_LABELED;
/*
* This updates ira_cred, ira_tsl and ira_free_flags based
* on the label. We don't expect this to ever fail for
* loopback packets, so we silently drop the packet should it
* fail.
*/
if (!tsol_get_pkt_label(mp, IPV4_VERSION, &iras)) {
BUMP_MIB(ill->ill_ip_mib, ipIfStatsInDiscards);
ip_drop_input("tsol_get_pkt_label", mp, ill);
freemsg(mp);
return (0);
}
ASSERT(iras.ira_tsl != NULL);
/* tsol_get_pkt_label sometimes does pullupmsg */
ipha = (ipha_t *)mp->b_rptr;
}
ip_fanout_v4(mp, ipha, &iras);
/* We moved any IPsec refs from ixa to iras */
ira_cleanup(&iras, B_FALSE);
return (0);
}
/*
* ire_sendfn for IRE_BROADCAST
* If the broadcast address is present on multiple ills and ixa_ifindex
* isn't set, then we generate
* a separate datagram (potentially with different source address) for
* those ills. In any case, only one copy is looped back to ip_input_v4.
*/
int
ire_send_broadcast_v4(ire_t *ire, mblk_t *mp, void *iph_arg,
ip_xmit_attr_t *ixa, uint32_t *identp)
{
ipha_t *ipha = (ipha_t *)iph_arg;
ip_stack_t *ipst = ixa->ixa_ipst;
irb_t *irb = ire->ire_bucket;
ire_t *ire1;
mblk_t *mp1;
ipha_t *ipha1;
iaflags_t ixaflags = ixa->ixa_flags;
nce_t *nce1, *nce_orig;
/*
* Unless ire_send_multirt_v4 already set a ttl, force the
* ttl to a smallish value.
*/
if (!(ixa->ixa_flags & IXAF_NO_TTL_CHANGE)) {
/*
* To avoid broadcast storms, we usually set the TTL to 1 for
* broadcasts. This can
* be overridden stack-wide through the ip_broadcast_ttl
* ndd tunable, or on a per-connection basis through the
* IP_BROADCAST_TTL socket option.
*
* If SO_DONTROUTE/IXAF_DONTROUTE is set, then ire_send_wire_v4
* will force ttl to one after we've set this.
*/
if (ixaflags & IXAF_BROADCAST_TTL_SET)
ipha->ipha_ttl = ixa->ixa_broadcast_ttl;
else
ipha->ipha_ttl = ipst->ips_ip_broadcast_ttl;
}
/*
* Make sure we get a loopback copy (after IPsec and frag)
* Skip hardware checksum so that loopback copy is checksumed.
*/
ixa->ixa_flags |= IXAF_LOOPBACK_COPY | IXAF_NO_HW_CKSUM;
/* Do we need to potentially generate multiple copies? */
if (irb->irb_ire_cnt == 1 || ixa->ixa_ifindex != 0)
return (ire_send_wire_v4(ire, mp, ipha, ixa, identp));
/*
* Loop over all IRE_BROADCAST in the bucket (might only be one).
* Note that everything in the bucket has the same destination address.
*/
irb_refhold(irb);
for (ire1 = irb->irb_ire; ire1 != NULL; ire1 = ire1->ire_next) {
/* We do the main IRE after the end of the loop */
if (ire1 == ire)
continue;
/*
* Only IREs for the same IP address should be in the same
* bucket.
* But could have IRE_HOSTs in the case of CGTP.
* If we find any multirt routes we bail out of the loop
* and just do the single packet at the end; ip_postfrag_multirt
* will duplicate the packet.
*/
ASSERT(ire1->ire_addr == ire->ire_addr);
if (!(ire1->ire_type & IRE_BROADCAST))
continue;
if (IRE_IS_CONDEMNED(ire1))
continue;
if (ixa->ixa_zoneid != ALL_ZONES &&
ire->ire_zoneid != ire1->ire_zoneid)
continue;
ASSERT(ire->ire_ill != ire1->ire_ill && ire1->ire_ill != NULL);
if (ire1->ire_flags & RTF_MULTIRT)
break;
/*
* For IPMP we only send for the ipmp_ill. arp_nce_init() will
* ensure that this goes out on the cast_ill.
*/
if (IS_UNDER_IPMP(ire1->ire_ill))
continue;
mp1 = copymsg(mp);
if (mp1 == NULL) {
BUMP_MIB(ire1->ire_ill->ill_ip_mib,
ipIfStatsOutDiscards);
ip_drop_output("ipIfStatsOutDiscards",
mp, ire1->ire_ill);
continue;
}
ipha1 = (ipha_t *)mp1->b_rptr;
if (ixa->ixa_flags & IXAF_SET_SOURCE) {
/*
* Need to pick a different source address for each
* interface. If we have a global IPsec policy and
* no per-socket policy then we punt to
* ip_output_simple_v4 using a separate ip_xmit_attr_t.
*/
if (ixaflags & IXAF_IPSEC_GLOBAL_POLICY) {
ip_output_simple_broadcast(ixa, mp1);
continue;
}
/* Pick a new source address for each interface */
if (ip_select_source_v4(ire1->ire_ill, INADDR_ANY,
ipha1->ipha_dst, INADDR_ANY, ixa->ixa_zoneid, ipst,
&ipha1->ipha_src, NULL, NULL) != 0) {
BUMP_MIB(ire1->ire_ill->ill_ip_mib,
ipIfStatsOutDiscards);
ip_drop_output("ipIfStatsOutDiscards - select "
"broadcast source", mp1, ire1->ire_ill);
freemsg(mp1);
continue;
}
/*
* Check against global IPsec policy to set the AH/ESP
* attributes. IPsec will set IXAF_IPSEC_* and
* ixa_ipsec_* as appropriate.
*/
if (!(ixaflags & (IXAF_NO_IPSEC|IXAF_IPSEC_SECURE))) {
ASSERT(ixa->ixa_ipsec_policy == NULL);
mp1 = ip_output_attach_policy(mp1, ipha, NULL,
NULL, ixa);
if (mp1 == NULL) {
/*
* MIB and ip_drop_packet already
* done
*/
continue;
}
}
}
/* Make sure we have an NCE on this ill */
nce1 = arp_nce_init(ire1->ire_ill, ire1->ire_addr,
ire1->ire_type);
if (nce1 == NULL) {
BUMP_MIB(ire1->ire_ill->ill_ip_mib,
ipIfStatsOutDiscards);
ip_drop_output("ipIfStatsOutDiscards - broadcast nce",
mp1, ire1->ire_ill);
freemsg(mp1);
continue;
}
nce_orig = ixa->ixa_nce;
ixa->ixa_nce = nce1;
ire_refhold(ire1);
/*
* Ignore any errors here. We just collect the errno for
* the main ire below
*/
(void) ire_send_wire_v4(ire1, mp1, ipha1, ixa, identp);
ire_refrele(ire1);
ixa->ixa_nce = nce_orig;
nce_refrele(nce1);
ixa->ixa_flags &= ~IXAF_LOOPBACK_COPY;
}
irb_refrele(irb);
/* Finally, the main one */
/*
* For IPMP we only send broadcasts on the ipmp_ill.
*/
if (IS_UNDER_IPMP(ire->ire_ill)) {
freemsg(mp);
return (0);
}
return (ire_send_wire_v4(ire, mp, ipha, ixa, identp));
}
/*
* Send a packet using a different source address and different
* IPsec policy.
*/
static void
ip_output_simple_broadcast(ip_xmit_attr_t *ixa, mblk_t *mp)
{
ip_xmit_attr_t ixas;
bzero(&ixas, sizeof (ixas));
ixas.ixa_flags = IXAF_BASIC_SIMPLE_V4;
ixas.ixa_zoneid = ixa->ixa_zoneid;
ixas.ixa_ifindex = 0;
ixas.ixa_ipst = ixa->ixa_ipst;
ixas.ixa_cred = ixa->ixa_cred;
ixas.ixa_cpid = ixa->ixa_cpid;
ixas.ixa_tsl = ixa->ixa_tsl;
ixas.ixa_multicast_ttl = IP_DEFAULT_MULTICAST_TTL;
(void) ip_output_simple(mp, &ixas);
ixa_cleanup(&ixas);
}
static void
multirt_check_v4(ire_t *ire, ipha_t *ipha, ip_xmit_attr_t *ixa)
{
ip_stack_t *ipst = ixa->ixa_ipst;
/* Limit the TTL on multirt packets */
if (ire->ire_type & IRE_MULTICAST) {
if (ipha->ipha_ttl > 1) {
ip2dbg(("ire_send_multirt_v4: forcing multicast "
"multirt TTL to 1 (was %d), dst 0x%08x\n",
ipha->ipha_ttl, ntohl(ire->ire_addr)));
ipha->ipha_ttl = 1;
}
ixa->ixa_flags |= IXAF_NO_TTL_CHANGE;
} else if ((ipst->ips_ip_multirt_ttl > 0) &&
(ipha->ipha_ttl > ipst->ips_ip_multirt_ttl)) {
ipha->ipha_ttl = ipst->ips_ip_multirt_ttl;
/*
* Need to ensure we don't increase the ttl should we go through
* ire_send_broadcast or multicast.
*/
ixa->ixa_flags |= IXAF_NO_TTL_CHANGE;
}
}
/*
* ire_sendfn for IRE_MULTICAST
*/
int
ire_send_multicast_v4(ire_t *ire, mblk_t *mp, void *iph_arg,
ip_xmit_attr_t *ixa, uint32_t *identp)
{
ipha_t *ipha = (ipha_t *)iph_arg;
ip_stack_t *ipst = ixa->ixa_ipst;
ill_t *ill = ire->ire_ill;
iaflags_t ixaflags = ixa->ixa_flags;
/*
* The IRE_MULTICAST is the same whether or not multirt is in use.
* Hence we need special-case code.
*/
if (ixaflags & IXAF_MULTIRT_MULTICAST)
multirt_check_v4(ire, ipha, ixa);
/*
* Check if anything in ip_input_v4 wants a copy of the transmitted
* packet (after IPsec and fragmentation)
*
* 1. Multicast routers always need a copy unless SO_DONTROUTE is set
* RSVP and the rsvp daemon is an example of a
* protocol and user level process that
* handles it's own routing. Hence, it uses the
* SO_DONTROUTE option to accomplish this.
* 2. If the sender has set IP_MULTICAST_LOOP, then we just
* check whether there are any receivers for the group on the ill
* (ignoring the zoneid).
* 3. If IP_MULTICAST_LOOP is not set, then we check if there are
* any members in other shared-IP zones.
* If such members exist, then we indicate that the sending zone
* shouldn't get a loopback copy to preserve the IP_MULTICAST_LOOP
* behavior.
*
* When we loopback we skip hardware checksum to make sure loopback
* copy is checksumed.
*
* Note that ire_ill is the upper in the case of IPMP.
*/
ixa->ixa_flags &= ~(IXAF_LOOPBACK_COPY | IXAF_NO_HW_CKSUM);
if (ipst->ips_ip_g_mrouter && ill->ill_mrouter_cnt > 0 &&
!(ixaflags & IXAF_DONTROUTE)) {
ixa->ixa_flags |= IXAF_LOOPBACK_COPY | IXAF_NO_HW_CKSUM;
} else if (ixaflags & IXAF_MULTICAST_LOOP) {
/*
* If this zone or any other zone has members then loopback
* a copy.
*/
if (ill_hasmembers_v4(ill, ipha->ipha_dst))
ixa->ixa_flags |= IXAF_LOOPBACK_COPY | IXAF_NO_HW_CKSUM;
} else if (ipst->ips_netstack->netstack_numzones > 1) {
/*
* This zone should not have a copy. But there are some other
* zones which might have members.
*/
if (ill_hasmembers_otherzones_v4(ill, ipha->ipha_dst,
ixa->ixa_zoneid)) {
ixa->ixa_flags |= IXAF_NO_LOOP_ZONEID_SET;
ixa->ixa_no_loop_zoneid = ixa->ixa_zoneid;
ixa->ixa_flags |= IXAF_LOOPBACK_COPY | IXAF_NO_HW_CKSUM;
}
}
/*
* Unless ire_send_multirt_v4 or icmp_output_hdrincl already set a ttl,
* force the ttl to the IP_MULTICAST_TTL value
*/
if (!(ixaflags & IXAF_NO_TTL_CHANGE)) {
ipha->ipha_ttl = ixa->ixa_multicast_ttl;
}
return (ire_send_wire_v4(ire, mp, ipha, ixa, identp));
}
/*
* ire_sendfn for IREs with RTF_MULTIRT
*/
int
ire_send_multirt_v4(ire_t *ire, mblk_t *mp, void *iph_arg,
ip_xmit_attr_t *ixa, uint32_t *identp)
{
ipha_t *ipha = (ipha_t *)iph_arg;
multirt_check_v4(ire, ipha, ixa);
if (ire->ire_type & IRE_MULTICAST)
return (ire_send_multicast_v4(ire, mp, ipha, ixa, identp));
else if (ire->ire_type & IRE_BROADCAST)
return (ire_send_broadcast_v4(ire, mp, ipha, ixa, identp));
else
return (ire_send_wire_v4(ire, mp, ipha, ixa, identp));
}
/*
* ire_sendfn for IREs with RTF_REJECT/RTF_BLACKHOLE, including IRE_NOROUTE
*/
int
ire_send_noroute_v4(ire_t *ire, mblk_t *mp, void *iph_arg,
ip_xmit_attr_t *ixa, uint32_t *identp)
{
ip_stack_t *ipst = ixa->ixa_ipst;
ipha_t *ipha = (ipha_t *)iph_arg;
ill_t *ill;
ip_recv_attr_t iras;
boolean_t dummy;
/* We assign an IP ident for nice errors */
ipha->ipha_ident = atomic_add_32_nv(identp, 1);
BUMP_MIB(&ipst->ips_ip_mib, ipIfStatsOutNoRoutes);
if (ire->ire_type & IRE_NOROUTE) {
/* A lack of a route as opposed to RTF_REJECT|BLACKHOLE */
ip_rts_change(RTM_MISS, ipha->ipha_dst, 0, 0, 0, 0, 0, 0,
RTA_DST, ipst);
}
if (ire->ire_flags & RTF_BLACKHOLE) {
ip_drop_output("ipIfStatsOutNoRoutes RTF_BLACKHOLE", mp, NULL);
freemsg(mp);
/* No error even for local senders - silent blackhole */
return (0);
}
ip_drop_output("ipIfStatsOutNoRoutes RTF_REJECT", mp, NULL);
/*
* We need an ill_t for the ip_recv_attr_t even though this packet
* was never received and icmp_unreachable doesn't currently use
* ira_ill.
*/
ill = ill_lookup_on_name("lo0", B_FALSE,
!(ixa->ixa_flags & IRAF_IS_IPV4), &dummy, ipst);
if (ill == NULL) {
freemsg(mp);
return (EHOSTUNREACH);
}
bzero(&iras, sizeof (iras));
/* Map ixa to ira including IPsec policies */
ipsec_out_to_in(ixa, ill, &iras);
if (ip_source_routed(ipha, ipst)) {
icmp_unreachable(mp, ICMP_SOURCE_ROUTE_FAILED, &iras);
} else {
icmp_unreachable(mp, ICMP_HOST_UNREACHABLE, &iras);
}
/* We moved any IPsec refs from ixa to iras */
ira_cleanup(&iras, B_FALSE);
ill_refrele(ill);
return (EHOSTUNREACH);
}
/*
* Calculate a checksum ignoring any hardware capabilities
*
* Returns B_FALSE if the packet was too short for the checksum. Caller
* should free and do stats.
*/
static boolean_t
ip_output_sw_cksum_v4(mblk_t *mp, ipha_t *ipha, ip_xmit_attr_t *ixa)
{
ip_stack_t *ipst = ixa->ixa_ipst;
uint_t pktlen = ixa->ixa_pktlen;
uint16_t *cksump;
uint32_t cksum;
uint8_t protocol = ixa->ixa_protocol;
uint16_t ip_hdr_length = ixa->ixa_ip_hdr_length;
ipaddr_t dst = ipha->ipha_dst;
ipaddr_t src = ipha->ipha_src;
/* Just in case it contained garbage */
DB_CKSUMFLAGS(mp) &= ~HCK_FLAGS;
/*
* Calculate ULP checksum
*/
if (protocol == IPPROTO_TCP) {
cksump = IPH_TCPH_CHECKSUMP(ipha, ip_hdr_length);
cksum = IP_TCP_CSUM_COMP;
} else if (protocol == IPPROTO_UDP) {
cksump = IPH_UDPH_CHECKSUMP(ipha, ip_hdr_length);
cksum = IP_UDP_CSUM_COMP;
} else if (protocol == IPPROTO_SCTP) {
sctp_hdr_t *sctph;
ASSERT(MBLKL(mp) >= (ip_hdr_length + sizeof (*sctph)));
sctph = (sctp_hdr_t *)(mp->b_rptr + ip_hdr_length);
/*
* Zero out the checksum field to ensure proper
* checksum calculation.
*/
sctph->sh_chksum = 0;
#ifdef DEBUG
if (!skip_sctp_cksum)
#endif
sctph->sh_chksum = sctp_cksum(mp, ip_hdr_length);
goto ip_hdr_cksum;
} else {
goto ip_hdr_cksum;
}
/* ULP puts the checksum field is in the first mblk */
ASSERT(((uchar_t *)cksump) + sizeof (uint16_t) <= mp->b_wptr);
/*
* We accumulate the pseudo header checksum in cksum.
* This is pretty hairy code, so watch close. One
* thing to keep in mind is that UDP and TCP have
* stored their respective datagram lengths in their
* checksum fields. This lines things up real nice.
*/
cksum += (dst >> 16) + (dst & 0xFFFF) + (src >> 16) + (src & 0xFFFF);
cksum = IP_CSUM(mp, ip_hdr_length, cksum);
/*
* For UDP/IPv4 a zero means that the packets wasn't checksummed.
* Change to 0xffff
*/
if (protocol == IPPROTO_UDP && cksum == 0)
*cksump = ~cksum;
else
*cksump = cksum;
IP_STAT(ipst, ip_out_sw_cksum);
IP_STAT_UPDATE(ipst, ip_out_sw_cksum_bytes, pktlen);
ip_hdr_cksum:
/* Calculate IPv4 header checksum */
ipha->ipha_hdr_checksum = 0;
ipha->ipha_hdr_checksum = ip_csum_hdr(ipha);
return (B_TRUE);
}
/*
* Calculate the ULP checksum - try to use hardware.
* In the case of MULTIRT, broadcast or multicast the
* IXAF_NO_HW_CKSUM is set in which case we use software.
*
* If the hardware supports IP header checksum offload; then clear the
* contents of IP header checksum field as expected by NIC.
* Do this only if we offloaded either full or partial sum.
*
* Returns B_FALSE if the packet was too short for the checksum. Caller
* should free and do stats.
*/
static boolean_t
ip_output_cksum_v4(iaflags_t ixaflags, mblk_t *mp, ipha_t *ipha,
ip_xmit_attr_t *ixa, ill_t *ill)
{
uint_t pktlen = ixa->ixa_pktlen;
uint16_t *cksump;
uint16_t hck_flags;
uint32_t cksum;
uint8_t protocol = ixa->ixa_protocol;
uint16_t ip_hdr_length = ixa->ixa_ip_hdr_length;
if ((ixaflags & IXAF_NO_HW_CKSUM) || !ILL_HCKSUM_CAPABLE(ill) ||
!dohwcksum) {
return (ip_output_sw_cksum_v4(mp, ipha, ixa));
}
/*
* Calculate ULP checksum. Note that we don't use cksump and cksum
* if the ill has FULL support.
*/
if (protocol == IPPROTO_TCP) {
cksump = IPH_TCPH_CHECKSUMP(ipha, ip_hdr_length);
cksum = IP_TCP_CSUM_COMP; /* Pseudo-header cksum */
} else if (protocol == IPPROTO_UDP) {
cksump = IPH_UDPH_CHECKSUMP(ipha, ip_hdr_length);
cksum = IP_UDP_CSUM_COMP; /* Pseudo-header cksum */
} else if (protocol == IPPROTO_SCTP) {
sctp_hdr_t *sctph;
ASSERT(MBLKL(mp) >= (ip_hdr_length + sizeof (*sctph)));
sctph = (sctp_hdr_t *)(mp->b_rptr + ip_hdr_length);
/*
* Zero out the checksum field to ensure proper
* checksum calculation.
*/
sctph->sh_chksum = 0;
#ifdef DEBUG
if (!skip_sctp_cksum)
#endif
sctph->sh_chksum = sctp_cksum(mp, ip_hdr_length);
goto ip_hdr_cksum;
} else {
ip_hdr_cksum:
/* Calculate IPv4 header checksum */
ipha->ipha_hdr_checksum = 0;
ipha->ipha_hdr_checksum = ip_csum_hdr(ipha);
return (B_TRUE);
}
/* ULP puts the checksum field is in the first mblk */
ASSERT(((uchar_t *)cksump) + sizeof (uint16_t) <= mp->b_wptr);
/*
* Underlying interface supports hardware checksum offload for
* the payload; leave the payload checksum for the hardware to
* calculate. N.B: We only need to set up checksum info on the
* first mblk.
*/
hck_flags = ill->ill_hcksum_capab->ill_hcksum_txflags;
DB_CKSUMFLAGS(mp) &= ~HCK_FLAGS;
if (hck_flags & HCKSUM_INET_FULL_V4) {
/*
* Hardware calculates pseudo-header, header and the
* payload checksums, so clear the checksum field in
* the protocol header.
*/
*cksump = 0;
DB_CKSUMFLAGS(mp) |= HCK_FULLCKSUM;
ipha->ipha_hdr_checksum = 0;
if (hck_flags & HCKSUM_IPHDRCKSUM) {
DB_CKSUMFLAGS(mp) |= HCK_IPV4_HDRCKSUM;
} else {
ipha->ipha_hdr_checksum = ip_csum_hdr(ipha);
}
return (B_TRUE);
}
if ((hck_flags) & HCKSUM_INET_PARTIAL) {
ipaddr_t dst = ipha->ipha_dst;
ipaddr_t src = ipha->ipha_src;
/*
* Partial checksum offload has been enabled. Fill
* the checksum field in the protocol header with the
* pseudo-header checksum value.
*
* We accumulate the pseudo header checksum in cksum.
* This is pretty hairy code, so watch close. One
* thing to keep in mind is that UDP and TCP have
* stored their respective datagram lengths in their
* checksum fields. This lines things up real nice.
*/
cksum += (dst >> 16) + (dst & 0xFFFF) +
(src >> 16) + (src & 0xFFFF);
cksum += *(cksump);
cksum = (cksum & 0xFFFF) + (cksum >> 16);
*(cksump) = (cksum & 0xFFFF) + (cksum >> 16);
/*
* Offsets are relative to beginning of IP header.
*/
DB_CKSUMSTART(mp) = ip_hdr_length;
DB_CKSUMSTUFF(mp) = (uint8_t *)cksump - (uint8_t *)ipha;
DB_CKSUMEND(mp) = pktlen;
DB_CKSUMFLAGS(mp) |= HCK_PARTIALCKSUM;
ipha->ipha_hdr_checksum = 0;
if (hck_flags & HCKSUM_IPHDRCKSUM) {
DB_CKSUMFLAGS(mp) |= HCK_IPV4_HDRCKSUM;
} else {
ipha->ipha_hdr_checksum = ip_csum_hdr(ipha);
}
return (B_TRUE);
}
/* Hardware capabilities include neither full nor partial IPv4 */
return (ip_output_sw_cksum_v4(mp, ipha, ixa));
}
/*
* ire_sendfn for offlink and onlink destinations.
* Also called from the multicast, broadcast, multirt send functions.
*
* Assumes that the caller has a hold on the ire.
*
* This function doesn't care if the IRE just became condemned since that
* can happen at any time.
*/
/* ARGSUSED */
int
ire_send_wire_v4(ire_t *ire, mblk_t *mp, void *iph_arg,
ip_xmit_attr_t *ixa, uint32_t *identp)
{
ip_stack_t *ipst = ixa->ixa_ipst;
ipha_t *ipha = (ipha_t *)iph_arg;
iaflags_t ixaflags = ixa->ixa_flags;
ill_t *ill;
ASSERT(ixa->ixa_nce != NULL);
ill = ixa->ixa_nce->nce_ill;
if (ixaflags & IXAF_DONTROUTE)
ipha->ipha_ttl = 1;
/*
* Assign an ident value for this packet. There could be other
* threads targeting the same destination, so we have to arrange
* for a atomic increment. Note that we use a 32-bit atomic add
* because it has better performance than its 16-bit sibling.
*
* Normally ixa_extra_ident is 0, but in the case of LSO it will
* be the number of TCP segments that the driver/hardware will
* extraly construct.
*
* If running in cluster mode and if the source address
* belongs to a replicated service then vector through
* cl_inet_ipident vector to allocate ip identifier
* NOTE: This is a contract private interface with the
* clustering group.
*/
if (cl_inet_ipident != NULL) {
ipaddr_t src = ipha->ipha_src;
ipaddr_t dst = ipha->ipha_dst;
netstackid_t stack_id = ipst->ips_netstack->netstack_stackid;
ASSERT(cl_inet_isclusterwide != NULL);
if ((*cl_inet_isclusterwide)(stack_id, IPPROTO_IP,
AF_INET, (uint8_t *)(uintptr_t)src, NULL)) {
/*
* Note: not correct with LSO since we can't allocate
* ixa_extra_ident+1 consecutive values.
*/
ipha->ipha_ident = (*cl_inet_ipident)(stack_id,
IPPROTO_IP, AF_INET, (uint8_t *)(uintptr_t)src,
(uint8_t *)(uintptr_t)dst, NULL);
} else {
ipha->ipha_ident = atomic_add_32_nv(identp,
ixa->ixa_extra_ident + 1);
}
} else {
ipha->ipha_ident = atomic_add_32_nv(identp,
ixa->ixa_extra_ident + 1);
}
#ifndef _BIG_ENDIAN
ipha->ipha_ident = htons(ipha->ipha_ident);
#endif
/*
* This might set b_band, thus the IPsec and fragmentation
* code in IP ensures that b_band is updated in the first mblk.
*/
if (IPP_ENABLED(IPP_LOCAL_OUT, ipst)) {
/* ip_process translates an IS_UNDER_IPMP */
mp = ip_process(IPP_LOCAL_OUT, mp, ill, ill);
if (mp == NULL) {
/* ip_drop_packet and MIB done */
return (0); /* Might just be delayed */
}
}
/*
* Verify any IPv4 options.
*
* The presense of IP options also forces the network stack to
* calculate the checksum in software. This is because:
*
* Wrap around: certain partial-checksum NICs (eri, ce) limit
* the size of "start offset" width to 6-bit. This effectively
* sets the largest value of the offset to 64-bytes, starting
* from the MAC header. When the cumulative MAC and IP headers
* exceed such limit, the offset will wrap around. This causes
* the checksum to be calculated at the wrong place.
*
* IPv4 source routing: none of the full-checksum capable NICs
* is capable of correctly handling the IPv4 source-routing
* option for purposes of calculating the pseudo-header; the
* actual destination is different from the destination in the
* header which is that of the next-hop. (This case may not be
* true for NICs which can parse IPv6 extension headers, but
* we choose to simplify the implementation by not offloading
* checksum when they are present.)
*/
if (!IS_SIMPLE_IPH(ipha)) {
ixaflags = ixa->ixa_flags |= IXAF_NO_HW_CKSUM;
/* An IS_UNDER_IPMP ill is ok here */
if (ip_output_options(mp, ipha, ixa, ill)) {
/* Packet has been consumed and ICMP error sent */
BUMP_MIB(ill->ill_ip_mib, ipIfStatsOutDiscards);
return (EINVAL);
}
}
/*
* To handle IPsec/iptun's labeling needs we need to tag packets
* while we still have ixa_tsl
*/
if (is_system_labeled() && ixa->ixa_tsl != NULL &&
(ill->ill_mactype == DL_6TO4 || ill->ill_mactype == DL_IPV4 ||
ill->ill_mactype == DL_IPV6)) {
cred_t *newcr;
newcr = copycred_from_tslabel(ixa->ixa_cred, ixa->ixa_tsl,
KM_NOSLEEP);
if (newcr == NULL) {
BUMP_MIB(ill->ill_ip_mib, ipIfStatsOutDiscards);
ip_drop_output("ipIfStatsOutDiscards - newcr",
mp, ill);
freemsg(mp);
return (ENOBUFS);
}
mblk_setcred(mp, newcr, NOPID);
crfree(newcr); /* mblk_setcred did its own crhold */
}
if (ixa->ixa_pktlen > ixa->ixa_fragsize ||
(ixaflags & IXAF_IPSEC_SECURE)) {
uint32_t pktlen;
pktlen = ixa->ixa_pktlen;
if (ixaflags & IXAF_IPSEC_SECURE)
pktlen += ipsec_out_extra_length(ixa);
if (pktlen > IP_MAXPACKET)
return (EMSGSIZE);
if (ixaflags & IXAF_SET_ULP_CKSUM) {
/*
* Compute ULP checksum and IP header checksum
* using software
*/
if (!ip_output_sw_cksum_v4(mp, ipha, ixa)) {
BUMP_MIB(ill->ill_ip_mib, ipIfStatsOutDiscards);
ip_drop_output("ipIfStatsOutDiscards", mp, ill);
freemsg(mp);
return (EINVAL);
}
} else {
/* Calculate IPv4 header checksum */
ipha->ipha_hdr_checksum = 0;
ipha->ipha_hdr_checksum = ip_csum_hdr(ipha);
}
/*
* If this packet would generate a icmp_frag_needed
* message, we need to handle it before we do the IPsec
* processing. Otherwise, we need to strip the IPsec
* headers before we send up the message to the ULPs
* which becomes messy and difficult.
*
* We check using IXAF_DONTFRAG. The DF bit in the header
* is not inspected - it will be copied to any generated
* fragments.
*/
if ((pktlen > ixa->ixa_fragsize) &&
(ixaflags & IXAF_DONTFRAG)) {
/* Generate ICMP and return error */
ip_recv_attr_t iras;
DTRACE_PROBE4(ip4__fragsize__fail, uint_t, pktlen,
uint_t, ixa->ixa_fragsize, uint_t, ixa->ixa_pktlen,
uint_t, ixa->ixa_pmtu);
bzero(&iras, sizeof (iras));
/* Map ixa to ira including IPsec policies */
ipsec_out_to_in(ixa, ill, &iras);
ip_drop_output("ICMP_FRAG_NEEDED", mp, ill);
icmp_frag_needed(mp, ixa->ixa_fragsize, &iras);
/* We moved any IPsec refs from ixa to iras */
ira_cleanup(&iras, B_FALSE);
return (EMSGSIZE);
}
DTRACE_PROBE4(ip4__fragsize__ok, uint_t, pktlen,
uint_t, ixa->ixa_fragsize, uint_t, ixa->ixa_pktlen,
uint_t, ixa->ixa_pmtu);
if (ixaflags & IXAF_IPSEC_SECURE) {
/*
* Pass in sufficient information so that
* IPsec can determine whether to fragment, and
* which function to call after fragmentation.
*/
return (ipsec_out_process(mp, ixa));
}
return (ip_fragment_v4(mp, ixa->ixa_nce, ixaflags,
ixa->ixa_pktlen, ixa->ixa_fragsize, ixa->ixa_xmit_hint,
ixa->ixa_zoneid, ixa->ixa_no_loop_zoneid,
ixa->ixa_postfragfn, &ixa->ixa_cookie));
}
if (ixaflags & IXAF_SET_ULP_CKSUM) {
/* Compute ULP checksum and IP header checksum */
/* An IS_UNDER_IPMP ill is ok here */
if (!ip_output_cksum_v4(ixaflags, mp, ipha, ixa, ill)) {
BUMP_MIB(ill->ill_ip_mib, ipIfStatsOutDiscards);
ip_drop_output("ipIfStatsOutDiscards", mp, ill);
freemsg(mp);
return (EINVAL);
}
} else {
/* Calculate IPv4 header checksum */
ipha->ipha_hdr_checksum = 0;
ipha->ipha_hdr_checksum = ip_csum_hdr(ipha);
}
return ((ixa->ixa_postfragfn)(mp, ixa->ixa_nce, ixaflags,
ixa->ixa_pktlen, ixa->ixa_xmit_hint, ixa->ixa_zoneid,
ixa->ixa_no_loop_zoneid, &ixa->ixa_cookie));
}
/*
* Send mp into ip_input
* Common for IPv4 and IPv6
*/
void
ip_postfrag_loopback(mblk_t *mp, nce_t *nce, iaflags_t ixaflags,
uint_t pkt_len, zoneid_t nolzid)
{
rtc_t rtc;
ill_t *ill = nce->nce_ill;
ip_recv_attr_t iras; /* NOTE: No bzero for performance */
ncec_t *ncec;
ncec = nce->nce_common;
iras.ira_flags = IRAF_VERIFY_IP_CKSUM | IRAF_VERIFY_ULP_CKSUM |
IRAF_LOOPBACK | IRAF_L2SRC_LOOPBACK;
if (ncec->ncec_flags & NCE_F_BCAST)
iras.ira_flags |= IRAF_L2DST_BROADCAST;
else if (ncec->ncec_flags & NCE_F_MCAST)
iras.ira_flags |= IRAF_L2DST_MULTICAST;
iras.ira_free_flags = 0;
iras.ira_cred = NULL;
iras.ira_cpid = NOPID;
iras.ira_tsl = NULL;
iras.ira_zoneid = ALL_ZONES;
iras.ira_pktlen = pkt_len;
UPDATE_MIB(ill->ill_ip_mib, ipIfStatsHCInOctets, iras.ira_pktlen);
BUMP_MIB(ill->ill_ip_mib, ipIfStatsHCInReceives);
if (ixaflags & IXAF_IS_IPV4)
iras.ira_flags |= IRAF_IS_IPV4;
iras.ira_ill = iras.ira_rill = ill;
iras.ira_ruifindex = ill->ill_phyint->phyint_ifindex;
iras.ira_rifindex = iras.ira_ruifindex;
iras.ira_mhip = NULL;
iras.ira_flags |= ixaflags & IAF_MASK;
iras.ira_no_loop_zoneid = nolzid;
/* Broadcast and multicast doesn't care about the squeue */
iras.ira_sqp = NULL;
rtc.rtc_ire = NULL;
if (ixaflags & IXAF_IS_IPV4) {
ipha_t *ipha = (ipha_t *)mp->b_rptr;
rtc.rtc_ipaddr = INADDR_ANY;
(*ill->ill_inputfn)(mp, ipha, &ipha->ipha_dst, &iras, &rtc);
if (rtc.rtc_ire != NULL) {
ASSERT(rtc.rtc_ipaddr != INADDR_ANY);
ire_refrele(rtc.rtc_ire);
}
} else {
ip6_t *ip6h = (ip6_t *)mp->b_rptr;
rtc.rtc_ip6addr = ipv6_all_zeros;
(*ill->ill_inputfn)(mp, ip6h, &ip6h->ip6_dst, &iras, &rtc);
if (rtc.rtc_ire != NULL) {
ASSERT(!IN6_IS_ADDR_UNSPECIFIED(&rtc.rtc_ip6addr));
ire_refrele(rtc.rtc_ire);
}
}
/* Any references to clean up? No hold on ira */
if (iras.ira_flags & (IRAF_IPSEC_SECURE|IRAF_SYSTEM_LABELED))
ira_cleanup(&iras, B_FALSE);
}
/*
* Post fragmentation function for IRE_MULTICAST and IRE_BROADCAST which
* looks at the IXAF_LOOPBACK_COPY flag.
* Common for IPv4 and IPv6.
*
* If the loopback copy fails (due to no memory) but we send the packet out
* on the wire we return no failure. Only in the case we supress the wire
* sending do we take the loopback failure into account.
*
* Note that we do not perform DTRACE_IP7 and FW_HOOKS for the looped back copy.
* Those operations are performed on this packet in ip_xmit() and it would
* be odd to do it twice for the same packet.
*/
int
ip_postfrag_loopcheck(mblk_t *mp, nce_t *nce, iaflags_t ixaflags,
uint_t pkt_len, uint32_t xmit_hint, zoneid_t szone, zoneid_t nolzid,
uintptr_t *ixacookie)
{
ill_t *ill = nce->nce_ill;
int error = 0;
/*
* Check for IXAF_LOOPBACK_COPY - send a copy to ip as if the driver
* had looped it back
*/
if (ixaflags & IXAF_LOOPBACK_COPY) {
mblk_t *mp1;
mp1 = copymsg(mp);
if (mp1 == NULL) {
/* Failed to deliver the loopback copy. */
BUMP_MIB(ill->ill_ip_mib, ipIfStatsOutDiscards);
ip_drop_output("ipIfStatsOutDiscards", mp, ill);
error = ENOBUFS;
} else {
ip_postfrag_loopback(mp1, nce, ixaflags, pkt_len,
nolzid);
}
}
/*
* If TTL = 0 then only do the loopback to this host i.e. we are
* done. We are also done if this was the
* loopback interface since it is sufficient
* to loopback one copy of a multicast packet.
*/
if (ixaflags & IXAF_IS_IPV4) {
ipha_t *ipha = (ipha_t *)mp->b_rptr;
if (ipha->ipha_ttl == 0) {
ip_drop_output("multicast ipha_ttl not sent to wire",
mp, ill);
freemsg(mp);
return (error);
}
} else {
ip6_t *ip6h = (ip6_t *)mp->b_rptr;
if (ip6h->ip6_hops == 0) {
ip_drop_output("multicast ipha_ttl not sent to wire",
mp, ill);
freemsg(mp);
return (error);
}
}
if (nce->nce_ill->ill_wq == NULL) {
/* Loopback interface */
ip_drop_output("multicast on lo0 not sent to wire", mp, ill);
freemsg(mp);
return (error);
}
return (ip_xmit(mp, nce, ixaflags, pkt_len, xmit_hint, szone, 0,
ixacookie));
}
/*
* Post fragmentation function for RTF_MULTIRT routes.
* Since IRE_BROADCASTs can have RTF_MULTIRT, this function
* checks IXAF_LOOPBACK_COPY.
*
* If no packet is sent due to failures then we return an errno, but if at
* least one succeeded we return zero.
*/
int
ip_postfrag_multirt_v4(mblk_t *mp, nce_t *nce, iaflags_t ixaflags,
uint_t pkt_len, uint32_t xmit_hint, zoneid_t szone, zoneid_t nolzid,
uintptr_t *ixacookie)
{
irb_t *irb;
ipha_t *ipha = (ipha_t *)mp->b_rptr;
ire_t *ire;
ire_t *ire1;
mblk_t *mp1;
nce_t *nce1;
ill_t *ill = nce->nce_ill;
ill_t *ill1;
ip_stack_t *ipst = ill->ill_ipst;
int error = 0;
int num_sent = 0;
int err;
uint_t ire_type;
ipaddr_t nexthop;
ASSERT(ixaflags & IXAF_IS_IPV4);
/* Check for IXAF_LOOPBACK_COPY */
if (ixaflags & IXAF_LOOPBACK_COPY) {
mblk_t *mp1;
mp1 = copymsg(mp);
if (mp1 == NULL) {
/* Failed to deliver the loopback copy. */
BUMP_MIB(ill->ill_ip_mib, ipIfStatsOutDiscards);
ip_drop_output("ipIfStatsOutDiscards", mp, ill);
error = ENOBUFS;
} else {
ip_postfrag_loopback(mp1, nce, ixaflags, pkt_len,
nolzid);
}
}
/*
* Loop over RTF_MULTIRT for ipha_dst in the same bucket. Send
* a copy to each one.
* Use the nce (nexthop) and ipha_dst to find the ire.
*
* MULTIRT is not designed to work with shared-IP zones thus we don't
* need to pass a zoneid or a label to the IRE lookup.
*/
if (V4_PART_OF_V6(nce->nce_addr) == ipha->ipha_dst) {
/* Broadcast and multicast case */
ire = ire_ftable_lookup_v4(ipha->ipha_dst, 0, 0, 0,
NULL, ALL_ZONES, NULL, MATCH_IRE_DSTONLY, 0, ipst, NULL);
} else {
ipaddr_t v4addr = V4_PART_OF_V6(nce->nce_addr);
/* Unicast case */
ire = ire_ftable_lookup_v4(ipha->ipha_dst, 0, v4addr, 0,
NULL, ALL_ZONES, NULL, MATCH_IRE_GW, 0, ipst, NULL);
}
if (ire == NULL ||
(ire->ire_flags & (RTF_REJECT|RTF_BLACKHOLE)) ||
!(ire->ire_flags & RTF_MULTIRT)) {
/* Drop */
ip_drop_output("ip_postfrag_multirt didn't find route",
mp, nce->nce_ill);
if (ire != NULL)
ire_refrele(ire);
return (ENETUNREACH);
}
irb = ire->ire_bucket;
irb_refhold(irb);
for (ire1 = irb->irb_ire; ire1 != NULL; ire1 = ire1->ire_next) {
/*
* For broadcast we can have a mixture of IRE_BROADCAST and
* IRE_HOST due to the manually added IRE_HOSTs that are used
* to trigger the creation of the special CGTP broadcast routes.
* Thus we have to skip if ire_type doesn't match the original.
*/
if (IRE_IS_CONDEMNED(ire1) ||
!(ire1->ire_flags & RTF_MULTIRT) ||
ire1->ire_type != ire->ire_type)
continue;
/* Do the ire argument one after the loop */
if (ire1 == ire)
continue;
ill1 = ire_nexthop_ill(ire1);
if (ill1 == NULL) {
/*
* This ire might not have been picked by
* ire_route_recursive, in which case ire_dep might
* not have been setup yet.
* We kick ire_route_recursive to try to resolve
* starting at ire1.
*/
ire_t *ire2;
uint_t match_flags = MATCH_IRE_DSTONLY;
if (ire1->ire_ill != NULL)
match_flags |= MATCH_IRE_ILL;
ire2 = ire_route_recursive_impl_v4(ire1,
ire1->ire_addr, ire1->ire_type, ire1->ire_ill,
ire1->ire_zoneid, NULL, match_flags,
IRR_ALLOCATE, 0, ipst, NULL, NULL, NULL);
if (ire2 != NULL)
ire_refrele(ire2);
ill1 = ire_nexthop_ill(ire1);
}
if (ill1 == NULL) {
BUMP_MIB(ill->ill_ip_mib, ipIfStatsOutDiscards);
ip_drop_output("ipIfStatsOutDiscards - no ill",
mp, ill);
error = ENETUNREACH;
continue;
}
/* Pick the addr and type to use for arp_nce_init */
if (nce->nce_common->ncec_flags & NCE_F_BCAST) {
ire_type = IRE_BROADCAST;
nexthop = ire1->ire_gateway_addr;
} else if (nce->nce_common->ncec_flags & NCE_F_MCAST) {
ire_type = IRE_MULTICAST;
nexthop = ipha->ipha_dst;
} else {
ire_type = ire1->ire_type; /* Doesn't matter */
nexthop = ire1->ire_gateway_addr;
}
/* If IPMP meta or under, then we just drop */
if (ill1->ill_grp != NULL) {
BUMP_MIB(ill1->ill_ip_mib, ipIfStatsOutDiscards);
ip_drop_output("ipIfStatsOutDiscards - IPMP",
mp, ill1);
ill_refrele(ill1);
error = ENETUNREACH;
continue;
}
nce1 = arp_nce_init(ill1, nexthop, ire_type);
if (nce1 == NULL) {
BUMP_MIB(ill1->ill_ip_mib, ipIfStatsOutDiscards);
ip_drop_output("ipIfStatsOutDiscards - no nce",
mp, ill1);
ill_refrele(ill1);
error = ENETUNREACH;
continue;
}
mp1 = copymsg(mp);
if (mp1 == NULL) {
BUMP_MIB(ill1->ill_ip_mib, ipIfStatsOutDiscards);
ip_drop_output("ipIfStatsOutDiscards", mp, ill1);
nce_refrele(nce1);
ill_refrele(ill1);
error = ENOBUFS;
continue;
}
/* Preserve HW checksum for this copy */
DB_CKSUMSTART(mp1) = DB_CKSUMSTART(mp);
DB_CKSUMSTUFF(mp1) = DB_CKSUMSTUFF(mp);
DB_CKSUMEND(mp1) = DB_CKSUMEND(mp);
DB_CKSUMFLAGS(mp1) = DB_CKSUMFLAGS(mp);
DB_LSOMSS(mp1) = DB_LSOMSS(mp);
ire1->ire_ob_pkt_count++;
err = ip_xmit(mp1, nce1, ixaflags, pkt_len, xmit_hint, szone,
0, ixacookie);
if (err == 0)
num_sent++;
else
error = err;
nce_refrele(nce1);
ill_refrele(ill1);
}
irb_refrele(irb);
ire_refrele(ire);
/* Finally, the main one */
err = ip_xmit(mp, nce, ixaflags, pkt_len, xmit_hint, szone, 0,
ixacookie);
if (err == 0)
num_sent++;
else
error = err;
if (num_sent > 0)
return (0);
else
return (error);
}
/*
* Verify local connectivity. This check is called by ULP fusion code.
* The generation number on an IRE_LOCAL or IRE_LOOPBACK only changes if
* the interface is brought down and back up. So we simply fail the local
* process. The caller, TCP Fusion, should unfuse the connection.
*/
boolean_t
ip_output_verify_local(ip_xmit_attr_t *ixa)
{
ire_t *ire = ixa->ixa_ire;
if (!(ire->ire_type & (IRE_LOCAL | IRE_LOOPBACK)))
return (B_FALSE);
return (ixa->ixa_ire->ire_generation == ixa->ixa_ire_generation);
}
/*
* Local process for ULP loopback, TCP Fusion. Handle both IPv4 and IPv6.
*
* The caller must call ip_output_verify_local() first. This function handles
* IPobs, FW_HOOKS, and/or IPsec cases sequentially.
*/
mblk_t *
ip_output_process_local(mblk_t *mp, ip_xmit_attr_t *ixa, boolean_t hooks_out,
boolean_t hooks_in, conn_t *peer_connp)
{
ill_t *ill = ixa->ixa_ire->ire_ill;
ipha_t *ipha = NULL;
ip6_t *ip6h = NULL;
ip_stack_t *ipst = ixa->ixa_ipst;
iaflags_t ixaflags = ixa->ixa_flags;
ip_recv_attr_t iras;
int error;
ASSERT(mp != NULL);
if (ixaflags & IXAF_IS_IPV4) {
ipha = (ipha_t *)mp->b_rptr;
/*
* If a callback is enabled then we need to know the
* source and destination zoneids for the packet. We already
* have those handy.
*/
if (ipst->ips_ip4_observe.he_interested) {
zoneid_t szone, dzone;
zoneid_t stackzoneid;
stackzoneid = netstackid_to_zoneid(
ipst->ips_netstack->netstack_stackid);
if (stackzoneid == GLOBAL_ZONEID) {
/* Shared-IP zone */
dzone = ixa->ixa_ire->ire_zoneid;
szone = ixa->ixa_zoneid;
} else {
szone = dzone = stackzoneid;
}
ipobs_hook(mp, IPOBS_HOOK_LOCAL, szone, dzone, ill,
ipst);
}
DTRACE_IP7(send, mblk_t *, mp, conn_t *, NULL, void_ip_t *,
ipha, __dtrace_ipsr_ill_t *, ill, ipha_t *, ipha, ip6_t *,
NULL, int, 1);
/* FW_HOOKS: LOOPBACK_OUT */
if (hooks_out) {
DTRACE_PROBE4(ip4__loopback__out__start, ill_t *, NULL,
ill_t *, ill, ipha_t *, ipha, mblk_t *, mp);
FW_HOOKS(ipst->ips_ip4_loopback_out_event,
ipst->ips_ipv4firewall_loopback_out,
NULL, ill, ipha, mp, mp, 0, ipst, error);
DTRACE_PROBE1(ip4__loopback__out__end, mblk_t *, mp);
}
if (mp == NULL)
return (NULL);
/* FW_HOOKS: LOOPBACK_IN */
if (hooks_in) {
DTRACE_PROBE4(ip4__loopback__in__start, ill_t *, ill,
ill_t *, NULL, ipha_t *, ipha, mblk_t *, mp);
FW_HOOKS(ipst->ips_ip4_loopback_in_event,
ipst->ips_ipv4firewall_loopback_in,
ill, NULL, ipha, mp, mp, 0, ipst, error);
DTRACE_PROBE1(ip4__loopback__in__end, mblk_t *, mp);
}
if (mp == NULL)
return (NULL);
DTRACE_IP7(receive, mblk_t *, mp, conn_t *, NULL, void_ip_t *,
ipha, __dtrace_ipsr_ill_t *, ill, ipha_t *, ipha, ip6_t *,
NULL, int, 1);
/* Inbound IPsec polocies */
if (peer_connp != NULL) {
/* Map ixa to ira including IPsec policies. */
ipsec_out_to_in(ixa, ill, &iras);
mp = ipsec_check_inbound_policy(mp, peer_connp, ipha,
NULL, &iras);
}
} else {
ip6h = (ip6_t *)mp->b_rptr;
/*
* If a callback is enabled then we need to know the
* source and destination zoneids for the packet. We already
* have those handy.
*/
if (ipst->ips_ip6_observe.he_interested) {
zoneid_t szone, dzone;
zoneid_t stackzoneid;
stackzoneid = netstackid_to_zoneid(
ipst->ips_netstack->netstack_stackid);
if (stackzoneid == GLOBAL_ZONEID) {
/* Shared-IP zone */
dzone = ixa->ixa_ire->ire_zoneid;
szone = ixa->ixa_zoneid;
} else {
szone = dzone = stackzoneid;
}
ipobs_hook(mp, IPOBS_HOOK_LOCAL, szone, dzone, ill,
ipst);
}
DTRACE_IP7(send, mblk_t *, mp, conn_t *, NULL, void_ip_t *,
ip6h, __dtrace_ipsr_ill_t *, ill, ipha_t *, NULL, ip6_t *,
ip6h, int, 1);
/* FW_HOOKS: LOOPBACK_OUT */
if (hooks_out) {
DTRACE_PROBE4(ip6__loopback__out__start, ill_t *, NULL,
ill_t *, ill, ip6_t *, ip6h, mblk_t *, mp);
FW_HOOKS6(ipst->ips_ip6_loopback_out_event,
ipst->ips_ipv6firewall_loopback_out,
NULL, ill, ip6h, mp, mp, 0, ipst, error);
DTRACE_PROBE1(ip6__loopback__out__end, mblk_t *, mp);
}
if (mp == NULL)
return (NULL);
/* FW_HOOKS: LOOPBACK_IN */
if (hooks_in) {
DTRACE_PROBE4(ip6__loopback__in__start, ill_t *, ill,
ill_t *, NULL, ip6_t *, ip6h, mblk_t *, mp);
FW_HOOKS6(ipst->ips_ip6_loopback_in_event,
ipst->ips_ipv6firewall_loopback_in,
ill, NULL, ip6h, mp, mp, 0, ipst, error);
DTRACE_PROBE1(ip6__loopback__in__end, mblk_t *, mp);
}
if (mp == NULL)
return (NULL);
DTRACE_IP7(receive, mblk_t *, mp, conn_t *, NULL, void_ip_t *,
ip6h, __dtrace_ipsr_ill_t *, ill, ipha_t *, NULL, ip6_t *,
ip6h, int, 1);
/* Inbound IPsec polocies */
if (peer_connp != NULL) {
/* Map ixa to ira including IPsec policies. */
ipsec_out_to_in(ixa, ill, &iras);
mp = ipsec_check_inbound_policy(mp, peer_connp, NULL,
ip6h, &iras);
}
}
if (mp == NULL) {
BUMP_MIB(ill->ill_ip_mib, ipIfStatsInDiscards);
ip_drop_input("ipIfStatsInDiscards", NULL, ill);
}
return (mp);
}