263 строки
8.6 KiB
C
263 строки
8.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
|
|
#ifndef _CCID_H
|
|
#define _CCID_H
|
|
/*
|
|
* net/dccp/ccid.h
|
|
*
|
|
* An implementation of the DCCP protocol
|
|
* Arnaldo Carvalho de Melo <acme@conectiva.com.br>
|
|
*
|
|
* CCID infrastructure
|
|
*/
|
|
|
|
#include <net/sock.h>
|
|
#include <linux/compiler.h>
|
|
#include <linux/dccp.h>
|
|
#include <linux/list.h>
|
|
#include <linux/module.h>
|
|
|
|
/* maximum value for a CCID (RFC 4340, 19.5) */
|
|
#define CCID_MAX 255
|
|
#define CCID_SLAB_NAME_LENGTH 32
|
|
|
|
struct tcp_info;
|
|
|
|
/**
|
|
* struct ccid_operations - Interface to Congestion-Control Infrastructure
|
|
*
|
|
* @ccid_id: numerical CCID ID (up to %CCID_MAX, cf. table 5 in RFC 4340, 10.)
|
|
* @ccid_ccmps: the CCMPS including network/transport headers (0 when disabled)
|
|
* @ccid_name: alphabetical identifier string for @ccid_id
|
|
* @ccid_hc_{r,t}x_slab: memory pool for the receiver/sender half-connection
|
|
* @ccid_hc_{r,t}x_obj_size: size of the receiver/sender half-connection socket
|
|
*
|
|
* @ccid_hc_{r,t}x_init: CCID-specific initialisation routine (before startup)
|
|
* @ccid_hc_{r,t}x_exit: CCID-specific cleanup routine (before destruction)
|
|
* @ccid_hc_rx_packet_recv: implements the HC-receiver side
|
|
* @ccid_hc_{r,t}x_parse_options: parsing routine for CCID/HC-specific options
|
|
* @ccid_hc_{r,t}x_insert_options: insert routine for CCID/HC-specific options
|
|
* @ccid_hc_tx_packet_recv: implements feedback processing for the HC-sender
|
|
* @ccid_hc_tx_send_packet: implements the sending part of the HC-sender
|
|
* @ccid_hc_tx_packet_sent: does accounting for packets in flight by HC-sender
|
|
* @ccid_hc_{r,t}x_get_info: INET_DIAG information for HC-receiver/sender
|
|
* @ccid_hc_{r,t}x_getsockopt: socket options specific to HC-receiver/sender
|
|
*/
|
|
struct ccid_operations {
|
|
unsigned char ccid_id;
|
|
__u32 ccid_ccmps;
|
|
const char *ccid_name;
|
|
struct kmem_cache *ccid_hc_rx_slab,
|
|
*ccid_hc_tx_slab;
|
|
char ccid_hc_rx_slab_name[CCID_SLAB_NAME_LENGTH];
|
|
char ccid_hc_tx_slab_name[CCID_SLAB_NAME_LENGTH];
|
|
__u32 ccid_hc_rx_obj_size,
|
|
ccid_hc_tx_obj_size;
|
|
/* Interface Routines */
|
|
int (*ccid_hc_rx_init)(struct ccid *ccid, struct sock *sk);
|
|
int (*ccid_hc_tx_init)(struct ccid *ccid, struct sock *sk);
|
|
void (*ccid_hc_rx_exit)(struct sock *sk);
|
|
void (*ccid_hc_tx_exit)(struct sock *sk);
|
|
void (*ccid_hc_rx_packet_recv)(struct sock *sk,
|
|
struct sk_buff *skb);
|
|
int (*ccid_hc_rx_parse_options)(struct sock *sk, u8 pkt,
|
|
u8 opt, u8 *val, u8 len);
|
|
int (*ccid_hc_rx_insert_options)(struct sock *sk,
|
|
struct sk_buff *skb);
|
|
void (*ccid_hc_tx_packet_recv)(struct sock *sk,
|
|
struct sk_buff *skb);
|
|
int (*ccid_hc_tx_parse_options)(struct sock *sk, u8 pkt,
|
|
u8 opt, u8 *val, u8 len);
|
|
int (*ccid_hc_tx_send_packet)(struct sock *sk,
|
|
struct sk_buff *skb);
|
|
void (*ccid_hc_tx_packet_sent)(struct sock *sk,
|
|
unsigned int len);
|
|
void (*ccid_hc_rx_get_info)(struct sock *sk,
|
|
struct tcp_info *info);
|
|
void (*ccid_hc_tx_get_info)(struct sock *sk,
|
|
struct tcp_info *info);
|
|
int (*ccid_hc_rx_getsockopt)(struct sock *sk,
|
|
const int optname, int len,
|
|
u32 __user *optval,
|
|
int __user *optlen);
|
|
int (*ccid_hc_tx_getsockopt)(struct sock *sk,
|
|
const int optname, int len,
|
|
u32 __user *optval,
|
|
int __user *optlen);
|
|
};
|
|
|
|
extern struct ccid_operations ccid2_ops;
|
|
#ifdef CONFIG_IP_DCCP_CCID3
|
|
extern struct ccid_operations ccid3_ops;
|
|
#endif
|
|
|
|
int ccid_initialize_builtins(void);
|
|
void ccid_cleanup_builtins(void);
|
|
|
|
struct ccid {
|
|
struct ccid_operations *ccid_ops;
|
|
char ccid_priv[0];
|
|
};
|
|
|
|
static inline void *ccid_priv(const struct ccid *ccid)
|
|
{
|
|
return (void *)ccid->ccid_priv;
|
|
}
|
|
|
|
bool ccid_support_check(u8 const *ccid_array, u8 array_len);
|
|
int ccid_get_builtin_ccids(u8 **ccid_array, u8 *array_len);
|
|
int ccid_getsockopt_builtin_ccids(struct sock *sk, int len,
|
|
char __user *, int __user *);
|
|
|
|
struct ccid *ccid_new(const u8 id, struct sock *sk, bool rx);
|
|
|
|
static inline int ccid_get_current_rx_ccid(struct dccp_sock *dp)
|
|
{
|
|
struct ccid *ccid = dp->dccps_hc_rx_ccid;
|
|
|
|
if (ccid == NULL || ccid->ccid_ops == NULL)
|
|
return -1;
|
|
return ccid->ccid_ops->ccid_id;
|
|
}
|
|
|
|
static inline int ccid_get_current_tx_ccid(struct dccp_sock *dp)
|
|
{
|
|
struct ccid *ccid = dp->dccps_hc_tx_ccid;
|
|
|
|
if (ccid == NULL || ccid->ccid_ops == NULL)
|
|
return -1;
|
|
return ccid->ccid_ops->ccid_id;
|
|
}
|
|
|
|
void ccid_hc_rx_delete(struct ccid *ccid, struct sock *sk);
|
|
void ccid_hc_tx_delete(struct ccid *ccid, struct sock *sk);
|
|
|
|
/*
|
|
* Congestion control of queued data packets via CCID decision.
|
|
*
|
|
* The TX CCID performs its congestion-control by indicating whether and when a
|
|
* queued packet may be sent, using the return code of ccid_hc_tx_send_packet().
|
|
* The following modes are supported via the symbolic constants below:
|
|
* - timer-based pacing (CCID returns a delay value in milliseconds);
|
|
* - autonomous dequeueing (CCID internally schedules dccps_xmitlet).
|
|
*/
|
|
|
|
enum ccid_dequeueing_decision {
|
|
CCID_PACKET_SEND_AT_ONCE = 0x00000, /* "green light": no delay */
|
|
CCID_PACKET_DELAY_MAX = 0x0FFFF, /* maximum delay in msecs */
|
|
CCID_PACKET_DELAY = 0x10000, /* CCID msec-delay mode */
|
|
CCID_PACKET_WILL_DEQUEUE_LATER = 0x20000, /* CCID autonomous mode */
|
|
CCID_PACKET_ERR = 0xF0000, /* error condition */
|
|
};
|
|
|
|
static inline int ccid_packet_dequeue_eval(const int return_code)
|
|
{
|
|
if (return_code < 0)
|
|
return CCID_PACKET_ERR;
|
|
if (return_code == 0)
|
|
return CCID_PACKET_SEND_AT_ONCE;
|
|
if (return_code <= CCID_PACKET_DELAY_MAX)
|
|
return CCID_PACKET_DELAY;
|
|
return return_code;
|
|
}
|
|
|
|
static inline int ccid_hc_tx_send_packet(struct ccid *ccid, struct sock *sk,
|
|
struct sk_buff *skb)
|
|
{
|
|
if (ccid->ccid_ops->ccid_hc_tx_send_packet != NULL)
|
|
return ccid->ccid_ops->ccid_hc_tx_send_packet(sk, skb);
|
|
return CCID_PACKET_SEND_AT_ONCE;
|
|
}
|
|
|
|
static inline void ccid_hc_tx_packet_sent(struct ccid *ccid, struct sock *sk,
|
|
unsigned int len)
|
|
{
|
|
if (ccid->ccid_ops->ccid_hc_tx_packet_sent != NULL)
|
|
ccid->ccid_ops->ccid_hc_tx_packet_sent(sk, len);
|
|
}
|
|
|
|
static inline void ccid_hc_rx_packet_recv(struct ccid *ccid, struct sock *sk,
|
|
struct sk_buff *skb)
|
|
{
|
|
if (ccid->ccid_ops->ccid_hc_rx_packet_recv != NULL)
|
|
ccid->ccid_ops->ccid_hc_rx_packet_recv(sk, skb);
|
|
}
|
|
|
|
static inline void ccid_hc_tx_packet_recv(struct ccid *ccid, struct sock *sk,
|
|
struct sk_buff *skb)
|
|
{
|
|
if (ccid->ccid_ops->ccid_hc_tx_packet_recv != NULL)
|
|
ccid->ccid_ops->ccid_hc_tx_packet_recv(sk, skb);
|
|
}
|
|
|
|
/**
|
|
* ccid_hc_tx_parse_options - Parse CCID-specific options sent by the receiver
|
|
* @pkt: type of packet that @opt appears on (RFC 4340, 5.1)
|
|
* @opt: the CCID-specific option type (RFC 4340, 5.8 and 10.3)
|
|
* @val: value of @opt
|
|
* @len: length of @val in bytes
|
|
*/
|
|
static inline int ccid_hc_tx_parse_options(struct ccid *ccid, struct sock *sk,
|
|
u8 pkt, u8 opt, u8 *val, u8 len)
|
|
{
|
|
if (!ccid || !ccid->ccid_ops->ccid_hc_tx_parse_options)
|
|
return 0;
|
|
return ccid->ccid_ops->ccid_hc_tx_parse_options(sk, pkt, opt, val, len);
|
|
}
|
|
|
|
/**
|
|
* ccid_hc_rx_parse_options - Parse CCID-specific options sent by the sender
|
|
* Arguments are analogous to ccid_hc_tx_parse_options()
|
|
*/
|
|
static inline int ccid_hc_rx_parse_options(struct ccid *ccid, struct sock *sk,
|
|
u8 pkt, u8 opt, u8 *val, u8 len)
|
|
{
|
|
if (!ccid || !ccid->ccid_ops->ccid_hc_rx_parse_options)
|
|
return 0;
|
|
return ccid->ccid_ops->ccid_hc_rx_parse_options(sk, pkt, opt, val, len);
|
|
}
|
|
|
|
static inline int ccid_hc_rx_insert_options(struct ccid *ccid, struct sock *sk,
|
|
struct sk_buff *skb)
|
|
{
|
|
if (ccid->ccid_ops->ccid_hc_rx_insert_options != NULL)
|
|
return ccid->ccid_ops->ccid_hc_rx_insert_options(sk, skb);
|
|
return 0;
|
|
}
|
|
|
|
static inline void ccid_hc_rx_get_info(struct ccid *ccid, struct sock *sk,
|
|
struct tcp_info *info)
|
|
{
|
|
if (ccid->ccid_ops->ccid_hc_rx_get_info != NULL)
|
|
ccid->ccid_ops->ccid_hc_rx_get_info(sk, info);
|
|
}
|
|
|
|
static inline void ccid_hc_tx_get_info(struct ccid *ccid, struct sock *sk,
|
|
struct tcp_info *info)
|
|
{
|
|
if (ccid->ccid_ops->ccid_hc_tx_get_info != NULL)
|
|
ccid->ccid_ops->ccid_hc_tx_get_info(sk, info);
|
|
}
|
|
|
|
static inline int ccid_hc_rx_getsockopt(struct ccid *ccid, struct sock *sk,
|
|
const int optname, int len,
|
|
u32 __user *optval, int __user *optlen)
|
|
{
|
|
int rc = -ENOPROTOOPT;
|
|
if (ccid != NULL && ccid->ccid_ops->ccid_hc_rx_getsockopt != NULL)
|
|
rc = ccid->ccid_ops->ccid_hc_rx_getsockopt(sk, optname, len,
|
|
optval, optlen);
|
|
return rc;
|
|
}
|
|
|
|
static inline int ccid_hc_tx_getsockopt(struct ccid *ccid, struct sock *sk,
|
|
const int optname, int len,
|
|
u32 __user *optval, int __user *optlen)
|
|
{
|
|
int rc = -ENOPROTOOPT;
|
|
if (ccid != NULL && ccid->ccid_ops->ccid_hc_tx_getsockopt != NULL)
|
|
rc = ccid->ccid_ops->ccid_hc_tx_getsockopt(sk, optname, len,
|
|
optval, optlen);
|
|
return rc;
|
|
}
|
|
#endif /* _CCID_H */
|