ip_dce.c revision 1a5e258f5471356ca102c7176637cdce45bac147
/*
* 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 (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2012, Joyent, Inc. All rights reserved.
*/
#include <sys/types.h>
#include <sys/stream.h>
#include <sys/strsun.h>
#include <sys/zone.h>
#include <sys/ddi.h>
#include <sys/disp.h>
#include <sys/sunddi.h>
#include <sys/cmn_err.h>
#include <sys/debug.h>
#include <sys/atomic.h>
#include <sys/callb.h>
#define _SUN_TPI_VERSION 2
#include <sys/tihdr.h>
#include <inet/common.h>
#include <inet/mi.h>
#include <inet/mib2.h>
#include <inet/snmpcom.h>
#include <netinet/ip6.h>
#include <netinet/icmp6.h>
#include <inet/ip.h>
#include <inet/ip_impl.h>
#include <inet/ip6.h>
#include <inet/ip6_asp.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/ip_ndp.h>
#include <inet/ipclassifier.h>
#include <inet/ip_listutils.h>
#include <sys/sunddi.h>
/*
* Routines for handling destination cache entries.
* There is always one DCEF_DEFAULT for each ip_stack_t created at init time.
* That entry holds both the IP ident value and the dce generation number.
*
* Any time a DCE is changed significantly (different path MTU, but NOT
* different ULP info!), the dce_generation number is increased.
* Also, when a new DCE is created, the dce_generation number in the default
* DCE is bumped. That allows the dce_t information to be cached efficiently
* as long as the entity caching the dce_t also caches the dce_generation,
* and compares the cached generation to detect any changes.
* Furthermore, when a DCE is deleted, if there are any outstanding references
* to the DCE it will be marked as condemned. The condemned mark is
* a designated generation number which is never otherwise used, hence
* the single comparison with the generation number captures that as well.
*
* An example of code which caches is as follows:
*
* if (mystruct->my_dce_generation != mystruct->my_dce->dce_generation) {
* The DCE has changed
* mystruct->my_dce = dce_lookup_pkt(mp, ixa,
* &mystruct->my_dce_generation);
* Not needed in practice, since we have the default DCE:
* if (DCE_IS_CONDEMNED(mystruct->my_dce))
* return failure;
* }
*
* Note that for IPv6 link-local addresses we record the ifindex since the
* link-locals are not globally unique.
*/
/*
* Hash bucket structure for DCEs
*/
typedef struct dcb_s {
krwlock_t dcb_lock;
uint32_t dcb_cnt;
dce_t *dcb_dce;
} dcb_t;
static void dce_delete_locked(dcb_t *, dce_t *);
static void dce_make_condemned(dce_t *);
static kmem_cache_t *dce_cache;
static kthread_t *dce_reclaim_thread;
static kmutex_t dce_reclaim_lock;
static kcondvar_t dce_reclaim_cv;
static int dce_reclaim_shutdown;
/* Global so it can be tuned in /etc/system. This must be a power of two. */
uint_t ip_dce_hash_size = 1024;
/* The time in seconds between executions of the IP DCE reclaim worker. */
uint_t ip_dce_reclaim_interval = 60;
/* The factor of the DCE threshold at which to start hard reclaims */
uint_t ip_dce_reclaim_threshold_hard = 2;
/* Operates on a uint64_t */
#define RANDOM_HASH(p) ((p) ^ ((p)>>16) ^ ((p)>>32) ^ ((p)>>48))
/*
* Reclaim a fraction of dce's in the dcb.
* For now we have a higher probability to delete DCEs without DCE_PMTU.
*/
static void
dcb_reclaim(dcb_t *dcb, ip_stack_t *ipst, uint_t fraction)
{
uint_t fraction_pmtu = fraction*4;
uint_t hash;
dce_t *dce, *nextdce;
hrtime_t seed = gethrtime();
uint_t retained = 0;
uint_t max = ipst->ips_ip_dce_reclaim_threshold;
max *= ip_dce_reclaim_threshold_hard;
rw_enter(&dcb->dcb_lock, RW_WRITER);
for (dce = dcb->dcb_dce; dce != NULL; dce = nextdce) {
nextdce = dce->dce_next;
/* Clear DCEF_PMTU if the pmtu is too old */
mutex_enter(&dce->dce_lock);
if ((dce->dce_flags & DCEF_PMTU) &&
TICK_TO_SEC(ddi_get_lbolt64()) - dce->dce_last_change_time >
ipst->ips_ip_pathmtu_interval) {
dce->dce_flags &= ~DCEF_PMTU;
mutex_exit(&dce->dce_lock);
dce_increment_generation(dce);
} else {
mutex_exit(&dce->dce_lock);
}
if (max == 0 || retained < max) {
hash = RANDOM_HASH((uint64_t)((uintptr_t)dce | seed));
if (dce->dce_flags & DCEF_PMTU) {
if (hash % fraction_pmtu != 0) {
retained++;
continue;
}
} else {
if (hash % fraction != 0) {
retained++;
continue;
}
}
}
IP_STAT(ipst, ip_dce_reclaim_deleted);
dce_delete_locked(dcb, dce);
dce_refrele(dce);
}
rw_exit(&dcb->dcb_lock);
}
/*
* kmem_cache callback to free up memory.
*
*/
static void
ip_dce_reclaim_stack(ip_stack_t *ipst)
{
int i;
IP_STAT(ipst, ip_dce_reclaim_calls);
for (i = 0; i < ipst->ips_dce_hashsize; i++) {
dcb_reclaim(&ipst->ips_dce_hash_v4[i], ipst,
ipst->ips_ip_dce_reclaim_fraction);
dcb_reclaim(&ipst->ips_dce_hash_v6[i], ipst,
ipst->ips_ip_dce_reclaim_fraction);
}
/*
* Walk all CONNs that can have a reference on an ire, nce or dce.
* Get them to update any stale references to drop any refholds they
* have.
*/
ipcl_walk(conn_ixa_cleanup, (void *)B_FALSE, ipst);
}
/*
* Called by dce_reclaim_worker() below, and no one else. Typically this will
* mean that the number of entries in the hash buckets has exceeded a tunable
* threshold.
*/
static void
ip_dce_reclaim(void)
{
netstack_handle_t nh;
netstack_t *ns;
ip_stack_t *ipst;
ASSERT(curthread == dce_reclaim_thread);
netstack_next_init(&nh);
while ((ns = netstack_next(&nh)) != NULL) {
/*
* netstack_next() can return a netstack_t with a NULL
* netstack_ip at boot time.
*/
if ((ipst = ns->netstack_ip) == NULL) {
netstack_rele(ns);
continue;
}
if (atomic_swap_uint(&ipst->ips_dce_reclaim_needed, 0) != 0)
ip_dce_reclaim_stack(ipst);
netstack_rele(ns);
}
netstack_next_fini(&nh);
}
/* ARGSUSED */
static void
dce_reclaim_worker(void *arg)
{
callb_cpr_t cprinfo;
CALLB_CPR_INIT(&cprinfo, &dce_reclaim_lock, callb_generic_cpr,
"dce_reclaim_worker");
mutex_enter(&dce_reclaim_lock);
while (!dce_reclaim_shutdown) {
CALLB_CPR_SAFE_BEGIN(&cprinfo);
(void) cv_timedwait(&dce_reclaim_cv, &dce_reclaim_lock,
ddi_get_lbolt() + ip_dce_reclaim_interval * hz);
CALLB_CPR_SAFE_END(&cprinfo, &dce_reclaim_lock);
if (dce_reclaim_shutdown)
break;
mutex_exit(&dce_reclaim_lock);
ip_dce_reclaim();
mutex_enter(&dce_reclaim_lock);
}
ASSERT(MUTEX_HELD(&dce_reclaim_lock));
dce_reclaim_thread = NULL;
dce_reclaim_shutdown = 0;
cv_broadcast(&dce_reclaim_cv);
CALLB_CPR_EXIT(&cprinfo); /* drops the lock */
thread_exit();
}
void
dce_g_init(void)
{
dce_cache = kmem_cache_create("dce_cache",
sizeof (dce_t), 0, NULL, NULL, NULL, NULL, NULL, 0);
mutex_init(&dce_reclaim_lock, NULL, MUTEX_DEFAULT, NULL);
cv_init(&dce_reclaim_cv, NULL, CV_DEFAULT, NULL);
dce_reclaim_thread = thread_create(NULL, 0, dce_reclaim_worker,
NULL, 0, &p0, TS_RUN, minclsyspri);
}
void
dce_g_destroy(void)
{
mutex_enter(&dce_reclaim_lock);
dce_reclaim_shutdown = 1;
cv_signal(&dce_reclaim_cv);
while (dce_reclaim_thread != NULL)
cv_wait(&dce_reclaim_cv, &dce_reclaim_lock);
mutex_exit(&dce_reclaim_lock);
cv_destroy(&dce_reclaim_cv);
mutex_destroy(&dce_reclaim_lock);
kmem_cache_destroy(dce_cache);
}
/*
* Allocate a default DCE and a hash table for per-IP address DCEs
*/
void
dce_stack_init(ip_stack_t *ipst)
{
int i;
ipst->ips_dce_default = kmem_cache_alloc(dce_cache, KM_SLEEP);
bzero(ipst->ips_dce_default, sizeof (dce_t));
ipst->ips_dce_default->dce_flags = DCEF_DEFAULT;
ipst->ips_dce_default->dce_generation = DCE_GENERATION_INITIAL;
ipst->ips_dce_default->dce_last_change_time =
TICK_TO_SEC(ddi_get_lbolt64());
ipst->ips_dce_default->dce_refcnt = 1; /* Should never go away */
ipst->ips_dce_default->dce_ipst = ipst;
/* This must be a power of two since we are using IRE_ADDR_HASH macro */
ipst->ips_dce_hashsize = ip_dce_hash_size;
ipst->ips_dce_hash_v4 = kmem_zalloc(ipst->ips_dce_hashsize *
sizeof (dcb_t), KM_SLEEP);
ipst->ips_dce_hash_v6 = kmem_zalloc(ipst->ips_dce_hashsize *
sizeof (dcb_t), KM_SLEEP);
for (i = 0; i < ipst->ips_dce_hashsize; i++) {
rw_init(&ipst->ips_dce_hash_v4[i].dcb_lock, NULL, RW_DEFAULT,
NULL);
rw_init(&ipst->ips_dce_hash_v6[i].dcb_lock, NULL, RW_DEFAULT,
NULL);
}
}
void
dce_stack_destroy(ip_stack_t *ipst)
{
int i;
for (i = 0; i < ipst->ips_dce_hashsize; i++) {
rw_destroy(&ipst->ips_dce_hash_v4[i].dcb_lock);
rw_destroy(&ipst->ips_dce_hash_v6[i].dcb_lock);
}
kmem_free(ipst->ips_dce_hash_v4,
ipst->ips_dce_hashsize * sizeof (dcb_t));
ipst->ips_dce_hash_v4 = NULL;
kmem_free(ipst->ips_dce_hash_v6,
ipst->ips_dce_hashsize * sizeof (dcb_t));
ipst->ips_dce_hash_v6 = NULL;
ipst->ips_dce_hashsize = 0;
ASSERT(ipst->ips_dce_default->dce_refcnt == 1);
kmem_cache_free(dce_cache, ipst->ips_dce_default);
ipst->ips_dce_default = NULL;
}
/* When any DCE is good enough */
dce_t *
dce_get_default(ip_stack_t *ipst)
{
dce_t *dce;
dce = ipst->ips_dce_default;
dce_refhold(dce);
return (dce);
}
/*
* Generic for IPv4 and IPv6.
*
* Used by callers that need to cache e.g., the datapath
* Returns the generation number in the last argument.
*/
dce_t *
dce_lookup_pkt(mblk_t *mp, ip_xmit_attr_t *ixa, uint_t *generationp)
{
if (ixa->ixa_flags & IXAF_IS_IPV4) {
/*
* If we have a source route we need to look for the final
* destination in the source route option.
*/
ipaddr_t final_dst;
ipha_t *ipha = (ipha_t *)mp->b_rptr;
final_dst = ip_get_dst(ipha);
return (dce_lookup_v4(final_dst, ixa->ixa_ipst, generationp));
} else {
uint_t ifindex;
/*
* If we have a routing header we need to look for the final
* destination in the routing extension header.
*/
in6_addr_t final_dst;
ip6_t *ip6h = (ip6_t *)mp->b_rptr;
final_dst = ip_get_dst_v6(ip6h, mp, NULL);
ifindex = 0;
if (IN6_IS_ADDR_LINKSCOPE(&final_dst) && ixa->ixa_nce != NULL) {
ifindex = ixa->ixa_nce->nce_common->ncec_ill->
ill_phyint->phyint_ifindex;
}
return (dce_lookup_v6(&final_dst, ifindex, ixa->ixa_ipst,
generationp));
}
}
/*
* Used by callers that need to cache e.g., the datapath
* Returns the generation number in the last argument.
*/
dce_t *
dce_lookup_v4(ipaddr_t dst, ip_stack_t *ipst, uint_t *generationp)
{
uint_t hash;
dcb_t *dcb;
dce_t *dce;
/* Set *generationp before dropping the lock(s) that allow additions */
if (generationp != NULL)
*generationp = ipst->ips_dce_default->dce_generation;
hash = IRE_ADDR_HASH(dst, ipst->ips_dce_hashsize);
dcb = &ipst->ips_dce_hash_v4[hash];
rw_enter(&dcb->dcb_lock, RW_READER);
for (dce = dcb->dcb_dce; dce != NULL; dce = dce->dce_next) {
if (dce->dce_v4addr == dst) {
mutex_enter(&dce->dce_lock);
if (!DCE_IS_CONDEMNED(dce)) {
dce_refhold(dce);
if (generationp != NULL)
*generationp = dce->dce_generation;
mutex_exit(&dce->dce_lock);
rw_exit(&dcb->dcb_lock);
return (dce);
}
mutex_exit(&dce->dce_lock);
}
}
rw_exit(&dcb->dcb_lock);
/* Not found */
dce = ipst->ips_dce_default;
dce_refhold(dce);
return (dce);
}
/*
* Used by callers that need to cache e.g., the datapath
* Returns the generation number in the last argument.
* ifindex should only be set for link-locals
*/
dce_t *
dce_lookup_v6(const in6_addr_t *dst, uint_t ifindex, ip_stack_t *ipst,
uint_t *generationp)
{
uint_t hash;
dcb_t *dcb;
dce_t *dce;
/* Set *generationp before dropping the lock(s) that allow additions */
if (generationp != NULL)
*generationp = ipst->ips_dce_default->dce_generation;
hash = IRE_ADDR_HASH_V6(*dst, ipst->ips_dce_hashsize);
dcb = &ipst->ips_dce_hash_v6[hash];
rw_enter(&dcb->dcb_lock, RW_READER);
for (dce = dcb->dcb_dce; dce != NULL; dce = dce->dce_next) {
if (IN6_ARE_ADDR_EQUAL(&dce->dce_v6addr, dst) &&
dce->dce_ifindex == ifindex) {
mutex_enter(&dce->dce_lock);
if (!DCE_IS_CONDEMNED(dce)) {
dce_refhold(dce);
if (generationp != NULL)
*generationp = dce->dce_generation;
mutex_exit(&dce->dce_lock);
rw_exit(&dcb->dcb_lock);
return (dce);
}
mutex_exit(&dce->dce_lock);
}
}
rw_exit(&dcb->dcb_lock);
/* Not found */
dce = ipst->ips_dce_default;
dce_refhold(dce);
return (dce);
}
/*
* Atomically looks for a non-default DCE, and if not found tries to create one.
* If there is no memory it returns NULL.
* When an entry is created we increase the generation number on
* the default DCE so that conn_ip_output will detect there is a new DCE.
*/
dce_t *
dce_lookup_and_add_v4(ipaddr_t dst, ip_stack_t *ipst)
{
uint_t hash;
dcb_t *dcb;
dce_t *dce;
hash = IRE_ADDR_HASH(dst, ipst->ips_dce_hashsize);
dcb = &ipst->ips_dce_hash_v4[hash];
/*
* Assuming that we get fairly even distribution across all of the
* buckets, once one bucket is overly full, prune the whole cache.
*/
if (dcb->dcb_cnt > ipst->ips_ip_dce_reclaim_threshold)
atomic_or_uint(&ipst->ips_dce_reclaim_needed, 1);
rw_enter(&dcb->dcb_lock, RW_WRITER);
for (dce = dcb->dcb_dce; dce != NULL; dce = dce->dce_next) {
if (dce->dce_v4addr == dst) {
mutex_enter(&dce->dce_lock);
if (!DCE_IS_CONDEMNED(dce)) {
dce_refhold(dce);
mutex_exit(&dce->dce_lock);
rw_exit(&dcb->dcb_lock);
return (dce);
}
mutex_exit(&dce->dce_lock);
}
}
dce = kmem_cache_alloc(dce_cache, KM_NOSLEEP);
if (dce == NULL) {
rw_exit(&dcb->dcb_lock);
return (NULL);
}
bzero(dce, sizeof (dce_t));
dce->dce_ipst = ipst; /* No netstack_hold */
dce->dce_v4addr = dst;
dce->dce_generation = DCE_GENERATION_INITIAL;
dce->dce_ipversion = IPV4_VERSION;
dce->dce_last_change_time = TICK_TO_SEC(ddi_get_lbolt64());
dce_refhold(dce); /* For the hash list */
/* Link into list */
if (dcb->dcb_dce != NULL)
dcb->dcb_dce->dce_ptpn = &dce->dce_next;
dce->dce_next = dcb->dcb_dce;
dce->dce_ptpn = &dcb->dcb_dce;
dcb->dcb_dce = dce;
dce->dce_bucket = dcb;
atomic_inc_32(&dcb->dcb_cnt);
dce_refhold(dce); /* For the caller */
rw_exit(&dcb->dcb_lock);
/* Initialize dce_ident to be different than for the last packet */
dce->dce_ident = ipst->ips_dce_default->dce_ident + 1;
dce_increment_generation(ipst->ips_dce_default);
return (dce);
}
/*
* Atomically looks for a non-default DCE, and if not found tries to create one.
* If there is no memory it returns NULL.
* When an entry is created we increase the generation number on
* the default DCE so that conn_ip_output will detect there is a new DCE.
* ifindex should only be used with link-local addresses.
*/
dce_t *
dce_lookup_and_add_v6(const in6_addr_t *dst, uint_t ifindex, ip_stack_t *ipst)
{
uint_t hash;
dcb_t *dcb;
dce_t *dce;
/* We should not create entries for link-locals w/o an ifindex */
ASSERT(!(IN6_IS_ADDR_LINKSCOPE(dst)) || ifindex != 0);
hash = IRE_ADDR_HASH_V6(*dst, ipst->ips_dce_hashsize);
dcb = &ipst->ips_dce_hash_v6[hash];
/*
* Assuming that we get fairly even distribution across all of the
* buckets, once one bucket is overly full, prune the whole cache.
*/
if (dcb->dcb_cnt > ipst->ips_ip_dce_reclaim_threshold)
atomic_or_uint(&ipst->ips_dce_reclaim_needed, 1);
rw_enter(&dcb->dcb_lock, RW_WRITER);
for (dce = dcb->dcb_dce; dce != NULL; dce = dce->dce_next) {
if (IN6_ARE_ADDR_EQUAL(&dce->dce_v6addr, dst) &&
dce->dce_ifindex == ifindex) {
mutex_enter(&dce->dce_lock);
if (!DCE_IS_CONDEMNED(dce)) {
dce_refhold(dce);
mutex_exit(&dce->dce_lock);
rw_exit(&dcb->dcb_lock);
return (dce);
}
mutex_exit(&dce->dce_lock);
}
}
dce = kmem_cache_alloc(dce_cache, KM_NOSLEEP);
if (dce == NULL) {
rw_exit(&dcb->dcb_lock);
return (NULL);
}
bzero(dce, sizeof (dce_t));
dce->dce_ipst = ipst; /* No netstack_hold */
dce->dce_v6addr = *dst;
dce->dce_ifindex = ifindex;
dce->dce_generation = DCE_GENERATION_INITIAL;
dce->dce_ipversion = IPV6_VERSION;
dce->dce_last_change_time = TICK_TO_SEC(ddi_get_lbolt64());
dce_refhold(dce); /* For the hash list */
/* Link into list */
if (dcb->dcb_dce != NULL)
dcb->dcb_dce->dce_ptpn = &dce->dce_next;
dce->dce_next = dcb->dcb_dce;
dce->dce_ptpn = &dcb->dcb_dce;
dcb->dcb_dce = dce;
dce->dce_bucket = dcb;
atomic_inc_32(&dcb->dcb_cnt);
dce_refhold(dce); /* For the caller */
rw_exit(&dcb->dcb_lock);
/* Initialize dce_ident to be different than for the last packet */
dce->dce_ident = ipst->ips_dce_default->dce_ident + 1;
dce_increment_generation(ipst->ips_dce_default);
return (dce);
}
/*
* Set/update uinfo. Creates a per-destination dce if none exists.
*
* Note that we do not bump the generation number here.
* New connections will find the new uinfo.
*
* The only use of this (tcp, sctp using iulp_t) is to set rtt+rtt_sd.
*/
static void
dce_setuinfo(dce_t *dce, iulp_t *uinfo)
{
/*
* Update the round trip time estimate and/or the max frag size
* and/or the slow start threshold.
*
* We serialize multiple advises using dce_lock.
*/
mutex_enter(&dce->dce_lock);
/* Gard against setting to zero */
if (uinfo->iulp_rtt != 0) {
/*
* If there is no old cached values, initialize them
* conservatively. Set them to be (1.5 * new value).
*/
if (dce->dce_uinfo.iulp_rtt != 0) {
dce->dce_uinfo.iulp_rtt = (dce->dce_uinfo.iulp_rtt +
uinfo->iulp_rtt) >> 1;
} else {
dce->dce_uinfo.iulp_rtt = uinfo->iulp_rtt +
(uinfo->iulp_rtt >> 1);
}
if (dce->dce_uinfo.iulp_rtt_sd != 0) {
dce->dce_uinfo.iulp_rtt_sd =
(dce->dce_uinfo.iulp_rtt_sd +
uinfo->iulp_rtt_sd) >> 1;
} else {
dce->dce_uinfo.iulp_rtt_sd = uinfo->iulp_rtt_sd +
(uinfo->iulp_rtt_sd >> 1);
}
}
if (uinfo->iulp_mtu != 0) {
if (dce->dce_flags & DCEF_PMTU) {
dce->dce_pmtu = MIN(uinfo->iulp_mtu, dce->dce_pmtu);
} else {
dce->dce_pmtu = MIN(uinfo->iulp_mtu, IP_MAXPACKET);
dce->dce_flags |= DCEF_PMTU;
}
dce->dce_last_change_time = TICK_TO_SEC(ddi_get_lbolt64());
}
if (uinfo->iulp_ssthresh != 0) {
if (dce->dce_uinfo.iulp_ssthresh != 0)
dce->dce_uinfo.iulp_ssthresh =
(uinfo->iulp_ssthresh +
dce->dce_uinfo.iulp_ssthresh) >> 1;
else
dce->dce_uinfo.iulp_ssthresh = uinfo->iulp_ssthresh;
}
/* We have uinfo for sure */
dce->dce_flags |= DCEF_UINFO;
mutex_exit(&dce->dce_lock);
}
int
dce_update_uinfo_v4(ipaddr_t dst, iulp_t *uinfo, ip_stack_t *ipst)
{
dce_t *dce;
dce = dce_lookup_and_add_v4(dst, ipst);
if (dce == NULL)
return (ENOMEM);
dce_setuinfo(dce, uinfo);
dce_refrele(dce);
return (0);
}
int
dce_update_uinfo_v6(const in6_addr_t *dst, uint_t ifindex, iulp_t *uinfo,
ip_stack_t *ipst)
{
dce_t *dce;
dce = dce_lookup_and_add_v6(dst, ifindex, ipst);
if (dce == NULL)
return (ENOMEM);
dce_setuinfo(dce, uinfo);
dce_refrele(dce);
return (0);
}
/* Common routine for IPv4 and IPv6 */
int
dce_update_uinfo(const in6_addr_t *dst, uint_t ifindex, iulp_t *uinfo,
ip_stack_t *ipst)
{
ipaddr_t dst4;
if (IN6_IS_ADDR_V4MAPPED_ANY(dst)) {
IN6_V4MAPPED_TO_IPADDR(dst, dst4);
return (dce_update_uinfo_v4(dst4, uinfo, ipst));
} else {
return (dce_update_uinfo_v6(dst, ifindex, uinfo, ipst));
}
}
static void
dce_make_condemned(dce_t *dce)
{
ip_stack_t *ipst = dce->dce_ipst;
mutex_enter(&dce->dce_lock);
ASSERT(!DCE_IS_CONDEMNED(dce));
dce->dce_generation = DCE_GENERATION_CONDEMNED;
mutex_exit(&dce->dce_lock);
/* Count how many condemned dces for kmem_cache callback */
atomic_inc_32(&ipst->ips_num_dce_condemned);
}
/*
* Increment the generation avoiding the special condemned value
*/
void
dce_increment_generation(dce_t *dce)
{
uint_t generation;
mutex_enter(&dce->dce_lock);
if (!DCE_IS_CONDEMNED(dce)) {
generation = dce->dce_generation + 1;
if (generation == DCE_GENERATION_CONDEMNED)
generation = DCE_GENERATION_INITIAL;
ASSERT(generation != DCE_GENERATION_VERIFY);
dce->dce_generation = generation;
}
mutex_exit(&dce->dce_lock);
}
/*
* Increment the generation number on all dces that have a path MTU and
* the default DCE. Used when ill_mtu or ill_mc_mtu changes.
*/
void
dce_increment_all_generations(boolean_t isv6, ip_stack_t *ipst)
{
int i;
dcb_t *dcb;
dce_t *dce;
for (i = 0; i < ipst->ips_dce_hashsize; i++) {
if (isv6)
dcb = &ipst->ips_dce_hash_v6[i];
else
dcb = &ipst->ips_dce_hash_v4[i];
rw_enter(&dcb->dcb_lock, RW_WRITER);
for (dce = dcb->dcb_dce; dce != NULL; dce = dce->dce_next) {
if (DCE_IS_CONDEMNED(dce))
continue;
dce_increment_generation(dce);
}
rw_exit(&dcb->dcb_lock);
}
dce_increment_generation(ipst->ips_dce_default);
}
/*
* Caller needs to do a dce_refrele since we can't do the
* dce_refrele under dcb_lock.
*/
static void
dce_delete_locked(dcb_t *dcb, dce_t *dce)
{
dce->dce_bucket = NULL;
*dce->dce_ptpn = dce->dce_next;
if (dce->dce_next != NULL)
dce->dce_next->dce_ptpn = dce->dce_ptpn;
dce->dce_ptpn = NULL;
dce->dce_next = NULL;
atomic_dec_32(&dcb->dcb_cnt);
dce_make_condemned(dce);
}
static void
dce_inactive(dce_t *dce)
{
ip_stack_t *ipst = dce->dce_ipst;
ASSERT(!(dce->dce_flags & DCEF_DEFAULT));
ASSERT(dce->dce_ptpn == NULL);
ASSERT(dce->dce_bucket == NULL);
/* Count how many condemned dces for kmem_cache callback */
if (DCE_IS_CONDEMNED(dce))
atomic_dec_32(&ipst->ips_num_dce_condemned);
kmem_cache_free(dce_cache, dce);
}
void
dce_refrele(dce_t *dce)
{
ASSERT(dce->dce_refcnt != 0);
if (atomic_dec_32_nv(&dce->dce_refcnt) == 0)
dce_inactive(dce);
}
void
dce_refhold(dce_t *dce)
{
atomic_inc_32(&dce->dce_refcnt);
ASSERT(dce->dce_refcnt != 0);
}
/* No tracing support yet hence the same as the above functions */
void
dce_refrele_notr(dce_t *dce)
{
ASSERT(dce->dce_refcnt != 0);
if (atomic_dec_32_nv(&dce->dce_refcnt) == 0)
dce_inactive(dce);
}
void
dce_refhold_notr(dce_t *dce)
{
atomic_inc_32(&dce->dce_refcnt);
ASSERT(dce->dce_refcnt != 0);
}
/* Report both the IPv4 and IPv6 DCEs. */
mblk_t *
ip_snmp_get_mib2_ip_dce(queue_t *q, mblk_t *mpctl, ip_stack_t *ipst)
{
struct opthdr *optp;
mblk_t *mp2ctl;
dest_cache_entry_t dest_cache;
mblk_t *mp_tail = NULL;
dce_t *dce;
dcb_t *dcb;
int i;
uint64_t current_time;
current_time = TICK_TO_SEC(ddi_get_lbolt64());
/*
* make a copy of the original message
*/
mp2ctl = copymsg(mpctl);
/* First we do IPv4 entries */
optp = (struct opthdr *)&mpctl->b_rptr[
sizeof (struct T_optmgmt_ack)];
optp->level = MIB2_IP;
optp->name = EXPER_IP_DCE;
for (i = 0; i < ipst->ips_dce_hashsize; i++) {
dcb = &ipst->ips_dce_hash_v4[i];
rw_enter(&dcb->dcb_lock, RW_READER);
for (dce = dcb->dcb_dce; dce != NULL; dce = dce->dce_next) {
dest_cache.DestIpv4Address = dce->dce_v4addr;
dest_cache.DestFlags = dce->dce_flags;
if (dce->dce_flags & DCEF_PMTU)
dest_cache.DestPmtu = dce->dce_pmtu;
else
dest_cache.DestPmtu = 0;
dest_cache.DestIdent = dce->dce_ident;
dest_cache.DestIfindex = 0;
dest_cache.DestAge = current_time -
dce->dce_last_change_time;
if (!snmp_append_data2(mpctl->b_cont, &mp_tail,
(char *)&dest_cache, (int)sizeof (dest_cache))) {
ip1dbg(("ip_snmp_get_mib2_ip_dce: "
"failed to allocate %u bytes\n",
(uint_t)sizeof (dest_cache)));
}
}
rw_exit(&dcb->dcb_lock);
}
optp->len = (t_uscalar_t)msgdsize(mpctl->b_cont);
ip3dbg(("ip_snmp_get: level %d, name %d, len %d\n",
(int)optp->level, (int)optp->name, (int)optp->len));
qreply(q, mpctl);
if (mp2ctl == NULL) {
/* Copymsg failed above */
return (NULL);
}
/* Now for IPv6 */
mpctl = mp2ctl;
mp_tail = NULL;
mp2ctl = copymsg(mpctl);
optp = (struct opthdr *)&mpctl->b_rptr[
sizeof (struct T_optmgmt_ack)];
optp->level = MIB2_IP6;
optp->name = EXPER_IP_DCE;
for (i = 0; i < ipst->ips_dce_hashsize; i++) {
dcb = &ipst->ips_dce_hash_v6[i];
rw_enter(&dcb->dcb_lock, RW_READER);
for (dce = dcb->dcb_dce; dce != NULL; dce = dce->dce_next) {
dest_cache.DestIpv6Address = dce->dce_v6addr;
dest_cache.DestFlags = dce->dce_flags;
if (dce->dce_flags & DCEF_PMTU)
dest_cache.DestPmtu = dce->dce_pmtu;
else
dest_cache.DestPmtu = 0;
dest_cache.DestIdent = dce->dce_ident;
if (IN6_IS_ADDR_LINKSCOPE(&dce->dce_v6addr))
dest_cache.DestIfindex = dce->dce_ifindex;
else
dest_cache.DestIfindex = 0;
dest_cache.DestAge = current_time -
dce->dce_last_change_time;
if (!snmp_append_data2(mpctl->b_cont, &mp_tail,
(char *)&dest_cache, (int)sizeof (dest_cache))) {
ip1dbg(("ip_snmp_get_mib2_ip_dce: "
"failed to allocate %u bytes\n",
(uint_t)sizeof (dest_cache)));
}
}
rw_exit(&dcb->dcb_lock);
}
optp->len = (t_uscalar_t)msgdsize(mpctl->b_cont);
ip3dbg(("ip_snmp_get: level %d, name %d, len %d\n",
(int)optp->level, (int)optp->name, (int)optp->len));
qreply(q, mpctl);
return (mp2ctl);
}
/*
* Remove IPv6 DCEs which refer to an ifindex that is going away.
* This is not required for correctness, but it avoids netstat -d
* showing stale stuff that will never be used.
*/
void
dce_cleanup(uint_t ifindex, ip_stack_t *ipst)
{
uint_t i;
dcb_t *dcb;
dce_t *dce, *nextdce;
for (i = 0; i < ipst->ips_dce_hashsize; i++) {
dcb = &ipst->ips_dce_hash_v6[i];
rw_enter(&dcb->dcb_lock, RW_WRITER);
for (dce = dcb->dcb_dce; dce != NULL; dce = nextdce) {
nextdce = dce->dce_next;
if (dce->dce_ifindex == ifindex) {
dce_delete_locked(dcb, dce);
dce_refrele(dce);
}
}
rw_exit(&dcb->dcb_lock);
}
}