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/*
* Ouroboros - Copyright (C) 2016 - 2024
*
* Policy for PFF supporting multipath routing
*
* Dimitri Staessens <dimitri@ouroboros.rocks>
* Sander Vrijders <sander@ouroboros.rocks>
* Nick Aerts <nick.aerts@ugent.be>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., http://www.fsf.org/about/contact/.
*/
#define _POSIX_C_SOURCE 200112L
#include "config.h"
#include <ouroboros/errno.h>
#include "pft.h"
#include "multipath.h"
#include <string.h>
#include <assert.h>
#include <pthread.h>
struct pff_i {
struct pft * pft;
pthread_rwlock_t lock;
};
struct pff_ops multipath_pff_ops = {
.create = multipath_pff_create,
.destroy = multipath_pff_destroy,
.lock = multipath_pff_lock,
.unlock = multipath_pff_unlock,
.add = multipath_pff_add,
.update = multipath_pff_update,
.del = multipath_pff_del,
.flush = multipath_pff_flush,
.nhop = multipath_pff_nhop,
.flow_state_change = NULL
};
struct pff_i * multipath_pff_create(void)
{
struct pff_i * tmp;
tmp = malloc(sizeof(*tmp));
if (tmp == NULL)
goto fail_malloc;
if (pthread_rwlock_init(&tmp->lock, NULL))
goto fail_rwlock;
tmp->pft = pft_create(PFT_SIZE, false);
if (tmp->pft == NULL)
goto fail_pft;
return tmp;
fail_pft:
pthread_rwlock_destroy(&tmp->lock);
fail_rwlock:
free(tmp);
fail_malloc:
return NULL;
}
void multipath_pff_destroy(struct pff_i * pff_i)
{
assert(pff_i);
pft_destroy(pff_i->pft);
pthread_rwlock_destroy(&pff_i->lock);
free(pff_i);
}
void multipath_pff_lock(struct pff_i * pff_i)
{
pthread_rwlock_wrlock(&pff_i->lock);
}
void multipath_pff_unlock(struct pff_i * pff_i)
{
pthread_rwlock_unlock(&pff_i->lock);
}
int multipath_pff_add(struct pff_i * pff_i,
uint64_t addr,
int * fds,
size_t len)
{
int * tmp;
assert(pff_i);
assert(fds);
assert(len > 0);
tmp = malloc(len * sizeof(*tmp));
if (tmp == NULL)
return -ENOMEM;
memcpy(tmp,fds, len * sizeof(*tmp));
if (pft_insert(pff_i->pft, addr, tmp, len)) {
free(tmp);
return -1;
}
return 0;
}
int multipath_pff_update(struct pff_i * pff_i,
uint64_t addr,
int * fds,
size_t len)
{
int * tmp;
assert(pff_i);
assert(fds);
assert(len > 0);
tmp = malloc(sizeof(*tmp));
if (tmp == NULL)
return -ENOMEM;
memcpy(tmp,fds, len * sizeof(*tmp));
if (pft_delete(pff_i->pft, addr)) {
free(tmp);
return -1;
}
if (pft_insert(pff_i->pft, addr, tmp, 1)) {
free(tmp);
return -1;
}
return 0;
}
int multipath_pff_del(struct pff_i * pff_i,
uint64_t addr)
{
assert(pff_i);
if (pft_delete(pff_i->pft, addr))
return -1;
return 0;
}
void multipath_pff_flush(struct pff_i * pff_i)
{
assert(pff_i);
pft_flush(pff_i->pft);
}
int multipath_pff_nhop(struct pff_i * pff_i,
uint64_t addr)
{
int fd;
int * fds;
size_t len;
assert(pff_i);
pthread_rwlock_wrlock(&pff_i->lock);
if (pft_lookup(pff_i->pft, addr, &fds, &len)) {
pthread_rwlock_unlock(&pff_i->lock);
return -1;
}
fd = *fds;
assert(len > 0);
/* Rotate fds left. */
memmove(fds, fds + 1, (len - 1) * sizeof(*fds));
fds[len - 1] = fd;
pthread_rwlock_unlock(&pff_i->lock);
return fd;
}
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