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/*
* Ouroboros - Copyright (C) 2016 - 2026
*
* Secure Shared Memory configuration
*
* Dimitri Staessens <dimitri@ouroboros.rocks>
* Sander Vrijders <sander@ouroboros.rocks>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* version 2.1 as published by the Free Software Foundation.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., http://www.fsf.org/about/contact/.
*/
#ifndef OUROBOROS_LIB_SSM_H
#define OUROBOROS_LIB_SSM_H
#include <stddef.h>
#include <stdint.h>
#include <stdatomic.h>
#include <sys/types.h>
/* Pool naming configuration */
#define SSM_PREFIX "@SSM_PREFIX@"
#define SSM_GSMP_SUFFIX "@SSM_GSMP_SUFFIX@"
#define SSM_PPP_SUFFIX "@SSM_PPP_SUFFIX@"
/* Legacy SSM constants */
#define SSM_RBUFF_PREFIX "@SSM_RBUFF_PREFIX@"
#define SSM_FLOW_SET_PREFIX "@SSM_FLOW_SET_PREFIX@"
#define SSM_POOL_NAME "@SSM_POOL_NAME@"
#define SSM_POOL_BLOCKS @SSM_POOL_BLOCKS@
#define SSM_RBUFF_SIZE @SSM_RBUFF_SIZE@
/* Packet buffer space reservation */
#define SSM_PK_BUFF_HEADSPACE @SSM_PK_BUFF_HEADSPACE@
#define SSM_PK_BUFF_TAILSPACE @SSM_PK_BUFF_TAILSPACE@
/* Pool blocks per size class */
#define SSM_POOL_256_BLOCKS @SSM_POOL_256_BLOCKS@
#define SSM_POOL_512_BLOCKS @SSM_POOL_512_BLOCKS@
#define SSM_POOL_1K_BLOCKS @SSM_POOL_1K_BLOCKS@
#define SSM_POOL_2K_BLOCKS @SSM_POOL_2K_BLOCKS@
#define SSM_POOL_4K_BLOCKS @SSM_POOL_4K_BLOCKS@
#define SSM_POOL_16K_BLOCKS @SSM_POOL_16K_BLOCKS@
#define SSM_POOL_64K_BLOCKS @SSM_POOL_64K_BLOCKS@
#define SSM_POOL_256K_BLOCKS @SSM_POOL_256K_BLOCKS@
#define SSM_POOL_1M_BLOCKS @SSM_POOL_1M_BLOCKS@
#define SSM_POOL_TOTAL_SIZE @SSM_POOL_TOTAL_SIZE@
/* Size class configuration */
#define SSM_POOL_MAX_CLASSES 9
#define SSM_POOL_SHARDS @SSM_POOL_SHARDS@
/* Internal structures - exposed for testing */
#ifdef __cplusplus
extern "C" {
#endif
#include <errno.h>
#include <pthread.h>
#include <ouroboros/pthread.h>
static __inline__ void robust_mutex_lock(pthread_mutex_t * mtx)
{
#ifndef HAVE_ROBUST_MUTEX
pthread_mutex_lock(mtx);
#else
if (pthread_mutex_lock(mtx) == EOWNERDEAD)
pthread_mutex_consistent(mtx);
#endif
}
static __inline__ int robust_wait(pthread_cond_t * cond,
pthread_mutex_t * mtx,
const struct timespec * abstime)
{
int ret = __timedwait(cond, mtx, abstime);
#ifdef HAVE_ROBUST_MUTEX
if (ret == EOWNERDEAD)
pthread_mutex_consistent(mtx);
#endif
return ret;
}
/* Packet buffer structure used by pool, rbuff, and tests */
struct ssm_pk_buff {
uint32_t next_offset; /* List linkage (pool < 4GB) */
uint16_t refcount; /* Reference count (app + rtx) */
pid_t allocator_pid; /* For orphan detection */
uint32_t size; /* Block size (max 1MB) */
uint32_t pk_head; /* Head offset into data */
uint32_t pk_tail; /* Tail offset into data */
uint32_t off; /* Block offset in pool */
uint8_t data[]; /* Packet data */
};
/* Size class configuration table */
struct ssm_size_class_cfg {
size_t size;
size_t blocks;
};
struct _ssm_list_head {
uint32_t head_offset;
uint32_t count;
};
struct _ssm_shard {
pthread_mutex_t mtx;
pthread_cond_t cond;
struct _ssm_list_head free_list;
size_t free_count;
};
struct _ssm_size_class {
struct _ssm_shard shards[SSM_POOL_SHARDS];
size_t object_size;
size_t pool_start;
size_t pool_size;
size_t object_count;
};
struct _ssm_pool_hdr {
pthread_mutex_t mtx;
pthread_cond_t healthy;
pid_t pid;
uint32_t initialized;
void * mapped_addr;
struct _ssm_size_class size_classes[SSM_POOL_MAX_CLASSES];
};
#ifdef __cplusplus
}
#endif
#endif /* OUROBOROS_LIB_SSM_H */
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