mirror of
https://passt.top/passt
synced 2024-11-09 22:29:56 +00:00
8f8eb73482
To implement the TCP hash table, we need an invalid (NULL-like) value for flow_sidx_t. We use FLOW_SIDX_NONE for that, but for defensiveness, we treat (usually) anything with an out of bounds flow index the same way. That's not always done consistently though. In flow_at_sidx() we open code a check on the flow index. In tcp_hash_probe() we instead compare against FLOW_SIDX_NONE, and in some other places we use the fact that flow_at_sidx() will return NULL in this case, even if we don't otherwise need the flow it returns. Clean this up a bit, by adding an explicit flow_sidx_valid() test function. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
121 lines
3.0 KiB
C
121 lines
3.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later
|
|
* Copyright Red Hat
|
|
* Author: David Gibson <david@gibson.dropbear.id.au>
|
|
*
|
|
* Definitions for the global table of packet flows.
|
|
*/
|
|
#ifndef FLOW_TABLE_H
|
|
#define FLOW_TABLE_H
|
|
|
|
#include "tcp_conn.h"
|
|
#include "icmp_flow.h"
|
|
|
|
/**
|
|
* struct flow_free_cluster - Information about a cluster of free entries
|
|
* @f: Generic flow information
|
|
* @n: Number of entries in the free cluster (including this one)
|
|
* @next: Index of next free cluster
|
|
*/
|
|
struct flow_free_cluster {
|
|
/* Must be first element */
|
|
struct flow_common f;
|
|
unsigned n;
|
|
unsigned next;
|
|
};
|
|
|
|
/**
|
|
* union flow - Descriptor for a logical packet flow (e.g. connection)
|
|
* @f: Fields common between all variants
|
|
* @tcp: Fields for non-spliced TCP connections
|
|
* @tcp_splice: Fields for spliced TCP connections
|
|
*/
|
|
union flow {
|
|
struct flow_common f;
|
|
struct flow_free_cluster free;
|
|
struct tcp_tap_conn tcp;
|
|
struct tcp_splice_conn tcp_splice;
|
|
struct icmp_ping_flow ping;
|
|
};
|
|
|
|
/* Global Flow Table */
|
|
extern unsigned flow_first_free;
|
|
extern union flow flowtab[];
|
|
|
|
|
|
/** flow_idx - Index of flow from common structure
|
|
* @f: Common flow fields pointer
|
|
*
|
|
* Return: index of @f in the flow table
|
|
*/
|
|
static inline unsigned flow_idx(const struct flow_common *f)
|
|
{
|
|
return (union flow *)f - flowtab;
|
|
}
|
|
|
|
/** FLOW_IDX - Find the index of a flow
|
|
* @f_: Flow pointer, either union flow * or protocol specific
|
|
*
|
|
* Return: index of @f in the flow table
|
|
*/
|
|
#define FLOW_IDX(f_) (flow_idx(&(f_)->f))
|
|
|
|
/** FLOW - Flow entry at a given index
|
|
* @idx: Flow index
|
|
*
|
|
* Return: pointer to entry @idx in the flow table
|
|
*/
|
|
#define FLOW(idx) (&flowtab[(idx)])
|
|
|
|
/** flow_at_sidx - Flow entry for a given sidx
|
|
* @sidx: Flow & side index
|
|
*
|
|
* Return: pointer to the corresponding flow entry, or NULL
|
|
*/
|
|
static inline union flow *flow_at_sidx(flow_sidx_t sidx)
|
|
{
|
|
if (!flow_sidx_valid(sidx))
|
|
return NULL;
|
|
return FLOW(sidx.flow);
|
|
}
|
|
|
|
/** flow_sidx_t - Index of one side of a flow from common structure
|
|
* @f: Common flow fields pointer
|
|
* @side: Which side to refer to (0 or 1)
|
|
*
|
|
* Return: index of @f and @side in the flow table
|
|
*/
|
|
static inline flow_sidx_t flow_sidx(const struct flow_common *f,
|
|
int side)
|
|
{
|
|
/* cppcheck-suppress [knownConditionTrueFalse, unmatchedSuppression] */
|
|
ASSERT(side == !!side);
|
|
|
|
return (flow_sidx_t){
|
|
.side = side,
|
|
.flow = flow_idx(f),
|
|
};
|
|
}
|
|
|
|
/** FLOW_SIDX - Find the index of one side of a flow
|
|
* @f_: Flow pointer, either union flow * or protocol specific
|
|
* @side: Which side to index (0 or 1)
|
|
*
|
|
* Return: index of @f and @side in the flow table
|
|
*/
|
|
#define FLOW_SIDX(f_, side) (flow_sidx(&(f_)->f, (side)))
|
|
|
|
union flow *flow_alloc(void);
|
|
void flow_alloc_cancel(union flow *flow);
|
|
|
|
void flow_initiate(union flow *flow, uint8_t pif);
|
|
void flow_target(union flow *flow, uint8_t pif);
|
|
|
|
union flow *flow_set_type(union flow *flow, enum flow_type type);
|
|
#define FLOW_SET_TYPE(flow_, t_, var_) (&flow_set_type((flow_), (t_))->var_)
|
|
|
|
void flow_activate(struct flow_common *f);
|
|
#define FLOW_ACTIVATE(flow_) \
|
|
(flow_activate(&(flow_)->f))
|
|
|
|
#endif /* FLOW_TABLE_H */
|