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/* NHRP virtual connection
* Copyright (c) 2014-2015 Timo Teräs
*
* This file is free software: you may copy, redistribute and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*/
#include "zebra.h"
#include "memory.h"
#include "stream.h"
#include "hash.h"
#include "thread.h"
#include "jhash.h"
#include "nhrpd.h"
#include "os.h"
DEFINE_MTYPE_STATIC(NHRPD, NHRP_VC, "NHRP virtual connection")
struct child_sa {
uint32_t id;
struct nhrp_vc *vc;
struct list_head childlist_entry;
};
static struct hash *nhrp_vc_hash;
static struct list_head childlist_head[512];
static unsigned int nhrp_vc_key(const void *peer_data)
{
const struct nhrp_vc *vc = peer_data;
return jhash_2words(sockunion_hash(&vc->local.nbma),
sockunion_hash(&vc->remote.nbma), 0);
}
static bool nhrp_vc_cmp(const void *cache_data, const void *key_data)
{
const struct nhrp_vc *a = cache_data;
const struct nhrp_vc *b = key_data;
return sockunion_same(&a->local.nbma, &b->local.nbma)
&& sockunion_same(&a->remote.nbma, &b->remote.nbma);
}
static void *nhrp_vc_alloc(void *data)
{
struct nhrp_vc *vc, *key = data;
vc = XMALLOC(MTYPE_NHRP_VC, sizeof(struct nhrp_vc));
*vc = (struct nhrp_vc){
.local.nbma = key->local.nbma,
.remote.nbma = key->remote.nbma,
.notifier_list =
NOTIFIER_LIST_INITIALIZER(&vc->notifier_list),
};
return vc;
}
static void nhrp_vc_free(void *data)
{
XFREE(MTYPE_NHRP_VC, data);
}
struct nhrp_vc *nhrp_vc_get(const union sockunion *src,
const union sockunion *dst, int create)
{
struct nhrp_vc key;
key.local.nbma = *src;
key.remote.nbma = *dst;
return hash_get(nhrp_vc_hash, &key, create ? nhrp_vc_alloc : 0);
}
static void nhrp_vc_check_delete(struct nhrp_vc *vc)
{
if (vc->updating || vc->ipsec || notifier_active(&vc->notifier_list))
return;
hash_release(nhrp_vc_hash, vc);
nhrp_vc_free(vc);
}
static void nhrp_vc_update(struct nhrp_vc *vc, long cmd)
{
vc->updating = 1;
notifier_call(&vc->notifier_list, cmd);
vc->updating = 0;
nhrp_vc_check_delete(vc);
}
static void nhrp_vc_ipsec_reset(struct nhrp_vc *vc)
{
vc->local.id[0] = 0;
vc->local.certlen = 0;
vc->remote.id[0] = 0;
vc->remote.certlen = 0;
}
int nhrp_vc_ipsec_updown(uint32_t child_id, struct nhrp_vc *vc)
{
char buf[2][SU_ADDRSTRLEN];
struct child_sa *sa = NULL, *lsa;
uint32_t child_hash = child_id % array_size(childlist_head);
int abort_migration = 0;
list_for_each_entry(lsa, &childlist_head[child_hash], childlist_entry)
{
if (lsa->id == child_id) {
sa = lsa;
break;
}
}
if (!sa) {
if (!vc)
return 0;
sa = XMALLOC(MTYPE_NHRP_VC, sizeof(struct child_sa));
*sa = (struct child_sa){
.id = child_id,
.childlist_entry =
LIST_INITIALIZER(sa->childlist_entry),
.vc = NULL,
};
list_add_tail(&sa->childlist_entry,
&childlist_head[child_hash]);
}
if (sa->vc == vc)
return 0;
if (vc) {
/* Attach first to new VC */
vc->ipsec++;
nhrp_vc_update(vc, NOTIFY_VC_IPSEC_CHANGED);
}
if (sa->vc && vc) {
/* Notify old VC of migration */
sa->vc->abort_migration = 0;
debugf(NHRP_DEBUG_COMMON, "IPsec NBMA change of %s to %s",
sockunion2str(&sa->vc->remote.nbma, buf[0],
sizeof buf[0]),
sockunion2str(&vc->remote.nbma, buf[1], sizeof buf[1]));
nhrp_vc_update(sa->vc, NOTIFY_VC_IPSEC_UPDATE_NBMA);
abort_migration = sa->vc->abort_migration;
}
if (sa->vc) {
/* Deattach old VC */
sa->vc->ipsec--;
if (!sa->vc->ipsec)
nhrp_vc_ipsec_reset(sa->vc);
nhrp_vc_update(sa->vc, NOTIFY_VC_IPSEC_CHANGED);
}
/* Update */
sa->vc = vc;
if (!vc) {
list_del(&sa->childlist_entry);
XFREE(MTYPE_NHRP_VC, sa);
}
return abort_migration;
}
void nhrp_vc_notify_add(struct nhrp_vc *vc, struct notifier_block *n,
notifier_fn_t action)
{
notifier_add(n, &vc->notifier_list, action);
}
void nhrp_vc_notify_del(struct nhrp_vc *vc, struct notifier_block *n)
{
notifier_del(n);
nhrp_vc_check_delete(vc);
}
struct nhrp_vc_iterator_ctx {
void (*cb)(struct nhrp_vc *, void *);
void *ctx;
};
static void nhrp_vc_iterator(struct hash_bucket *b, void *ctx)
{
struct nhrp_vc_iterator_ctx *ic = ctx;
ic->cb(b->data, ic->ctx);
}
void nhrp_vc_foreach(void (*cb)(struct nhrp_vc *, void *), void *ctx)
{
struct nhrp_vc_iterator_ctx ic = {
.cb = cb, .ctx = ctx,
};
hash_iterate(nhrp_vc_hash, nhrp_vc_iterator, &ic);
}
void nhrp_vc_init(void)
{
size_t i;
nhrp_vc_hash = hash_create(nhrp_vc_key, nhrp_vc_cmp, "NHRP VC hash");
for (i = 0; i < array_size(childlist_head); i++)
list_init(&childlist_head[i]);
}
void nhrp_vc_reset(void)
{
struct child_sa *sa, *n;
size_t i;
for (i = 0; i < array_size(childlist_head); i++) {
list_for_each_entry_safe(sa, n, &childlist_head[i],
childlist_entry)
nhrp_vc_ipsec_updown(sa->id, 0);
}
}
void nhrp_vc_terminate(void)
{
nhrp_vc_reset();
hash_clean(nhrp_vc_hash, nhrp_vc_free);
}
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