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/* vim:ts=8:sts=8:sw=4:noai:noexpandtab
*
* PGM socket buffers
*
* Copyright (c) 2006-2009 Miru Limited.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef __PGM_SKBUFF_H__
#define __PGM_SKBUFF_H__
#include <string.h>
struct pgm_sk_buff_t;
#include <pgm/types.h>
#include <pgm/atomic.h>
#include <pgm/mem.h>
#include <pgm/list.h>
#include <pgm/time.h>
#include <pgm/packet.h>
#include <pgm/tsi.h>
#include <pgm/socket.h>
PGM_BEGIN_DECLS
struct pgm_sk_buff_t {
pgm_list_t link_;
pgm_sock_t* restrict sock;
pgm_time_t tstamp;
pgm_tsi_t tsi;
uint32_t sequence;
uint32_t __padding; /* push alignment of pgm_sk_buff_t::cb to 8 bytes */
char cb[48]; /* control buffer */
uint16_t len; /* actual data */
unsigned zero_padded:1;
struct pgm_header* pgm_header;
struct pgm_opt_fragment* pgm_opt_fragment;
#define of_apdu_first_sqn pgm_opt_fragment->opt_sqn
#define of_frag_offset pgm_opt_fragment->opt_frag_off
#define of_apdu_len pgm_opt_fragment->opt_frag_len
struct pgm_opt_pgmcc_data* pgm_opt_pgmcc_data;
struct pgm_data* pgm_data;
void *head, /* all may-alias */
*data,
*tail,
*end;
uint32_t truesize;
volatile uint32_t users; /* atomic */
};
void pgm_skb_over_panic (const struct pgm_sk_buff_t*const, const uint16_t) PGM_GNUC_NORETURN;
void pgm_skb_under_panic (const struct pgm_sk_buff_t*const, const uint16_t) PGM_GNUC_NORETURN;
bool pgm_skb_is_valid (const struct pgm_sk_buff_t*const) PGM_GNUC_PURE PGM_GNUC_WARN_UNUSED_RESULT;
/* attribute __pure__ only valid for platforms with atomic ops.
* attribute __malloc__ not used as only part of the memory should be aliased.
* attribute __alloc_size__ does not allow headroom.
*/
static inline struct pgm_sk_buff_t* pgm_alloc_skb (const uint16_t) PGM_GNUC_WARN_UNUSED_RESULT;
static inline
struct pgm_sk_buff_t*
pgm_alloc_skb (
const uint16_t size
)
{
struct pgm_sk_buff_t* skb;
skb = (struct pgm_sk_buff_t*)pgm_malloc (size + sizeof(struct pgm_sk_buff_t));
if (PGM_UNLIKELY(pgm_mem_gc_friendly)) {
memset (skb, 0, size + sizeof(struct pgm_sk_buff_t));
skb->zero_padded = 1;
} else {
memset (skb, 0, sizeof(struct pgm_sk_buff_t));
}
skb->truesize = size + sizeof(struct pgm_sk_buff_t);
pgm_atomic_write32 (&skb->users, 1);
skb->head = skb + 1;
skb->data = skb->tail = skb->head;
skb->end = (char*)skb->data + size;
return skb;
}
/* increase reference count */
static inline
struct pgm_sk_buff_t*
pgm_skb_get (
struct pgm_sk_buff_t*const skb
)
{
pgm_atomic_inc32 (&skb->users);
return skb;
}
static inline
void
pgm_free_skb (
struct pgm_sk_buff_t*const skb
)
{
if (pgm_atomic_exchange_and_add32 (&skb->users, (uint32_t)-1) == 1)
pgm_free (skb);
}
/* add data */
static inline
void*
pgm_skb_put (
struct pgm_sk_buff_t* const skb,
const uint16_t len
)
{
void* tmp = skb->tail;
skb->tail = (char*)skb->tail + len;
skb->len += len;
if (PGM_UNLIKELY(skb->tail > skb->end))
pgm_skb_over_panic (skb, len);
return tmp;
}
static inline
void*
__pgm_skb_pull (
struct pgm_sk_buff_t*const skb,
const uint16_t len
)
{
skb->len -= len;
return skb->data = (char*)skb->data + len;
}
/* remove data from start of buffer */
static inline
void*
pgm_skb_pull (
struct pgm_sk_buff_t*const skb,
const uint16_t len
)
{
return PGM_UNLIKELY(len > skb->len) ? NULL : __pgm_skb_pull (skb, len);
}
static inline uint16_t pgm_skb_headroom (const struct pgm_sk_buff_t*const) PGM_GNUC_PURE PGM_GNUC_WARN_UNUSED_RESULT;
static inline uint16_t pgm_skb_tailroom (const struct pgm_sk_buff_t*const) PGM_GNUC_PURE PGM_GNUC_WARN_UNUSED_RESULT;
static inline
uint16_t
pgm_skb_headroom (
const struct pgm_sk_buff_t*const skb
)
{
return (char*)skb->data - (char*)skb->head;
}
static inline
uint16_t
pgm_skb_tailroom (
const struct pgm_sk_buff_t*const skb
)
{
return (char*)skb->end - (char*)skb->tail;
}
/* reserve space to add data */
static inline
void
pgm_skb_reserve (
struct pgm_sk_buff_t*const skb,
const uint16_t len
)
{
skb->data = (char*)skb->data + len;
skb->tail = (char*)skb->tail + len;
if (PGM_UNLIKELY(skb->tail > skb->end))
pgm_skb_over_panic (skb, len);
if (PGM_UNLIKELY(skb->data < skb->head))
pgm_skb_under_panic (skb, len);
}
static inline struct pgm_sk_buff_t* pgm_skb_copy (const struct pgm_sk_buff_t* const) PGM_GNUC_WARN_UNUSED_RESULT;
static inline
struct pgm_sk_buff_t*
pgm_skb_copy (
const struct pgm_sk_buff_t* const skb
)
{
struct pgm_sk_buff_t* newskb;
newskb = (struct pgm_sk_buff_t*)pgm_malloc (skb->truesize);
memcpy (newskb, skb, PGM_OFFSETOF(struct pgm_sk_buff_t, pgm_header));
newskb->zero_padded = 0;
newskb->truesize = skb->truesize;
pgm_atomic_write32 (&newskb->users, 1);
newskb->head = newskb + 1;
newskb->end = (char*)newskb->head + ((char*)skb->end - (char*)skb->head);
newskb->data = (char*)newskb->head + ((char*)skb->data - (char*)skb->head);
newskb->tail = (char*)newskb->head + ((char*)skb->tail - (char*)skb->head);
newskb->pgm_header = skb->pgm_header ? (struct pgm_header*)((char*)newskb->head + ((char*)skb->pgm_header - (char*)skb->head)) : skb->pgm_header;
newskb->pgm_opt_fragment = skb->pgm_opt_fragment ? (struct pgm_opt_fragment*)((char*)newskb->head + ((char*)skb->pgm_opt_fragment - (char*)skb->head)) : skb->pgm_opt_fragment;
newskb->pgm_data = skb->pgm_data ? (struct pgm_data*)((char*)newskb->head + ((char*)skb->pgm_data - (char*)skb->head)) : skb->pgm_data;
memcpy (newskb->head, skb->head, (char*)skb->end - (char*)skb->head);
return newskb;
}
static inline
void
pgm_skb_zero_pad (
struct pgm_sk_buff_t* const skb,
const uint16_t len
)
{
if (skb->zero_padded)
return;
const uint16_t tailroom = MIN(pgm_skb_tailroom (skb), len);
if (tailroom > 0)
memset (skb->tail, 0, tailroom);
skb->zero_padded = 1;
}
PGM_END_DECLS
#endif /* __PGM_SKBUFF_H__ */
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