232 lines
7.4 KiB
C
232 lines
7.4 KiB
C
#ifndef _CCID_H
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#define _CCID_H
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/*
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* net/dccp/ccid.h
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*
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* An implementation of the DCCP protocol
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* Arnaldo Carvalho de Melo <acme@conectiva.com.br>
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*
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* CCID infrastructure
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <net/sock.h>
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#include <linux/compiler.h>
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#include <linux/dccp.h>
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#include <linux/list.h>
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#include <linux/module.h>
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#define CCID_MAX 255
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struct tcp_info;
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/**
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* struct ccid_operations - Interface to Congestion-Control Infrastructure
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*
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* @ccid_id: numerical CCID ID (up to %CCID_MAX, cf. table 5 in RFC 4340, 10.)
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* @ccid_ccmps: the CCMPS including network/transport headers (0 when disabled)
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* @ccid_name: alphabetical identifier string for @ccid_id
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* @ccid_owner: module which implements/owns this CCID
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* @ccid_hc_{r,t}x_slab: memory pool for the receiver/sender half-connection
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* @ccid_hc_{r,t}x_obj_size: size of the receiver/sender half-connection socket
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*
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* @ccid_hc_{r,t}x_init: CCID-specific initialisation routine (before startup)
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* @ccid_hc_{r,t}x_exit: CCID-specific cleanup routine (before destruction)
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* @ccid_hc_rx_packet_recv: implements the HC-receiver side
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* @ccid_hc_{r,t}x_parse_options: parsing routine for CCID/HC-specific options
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* @ccid_hc_{r,t}x_insert_options: insert routine for CCID/HC-specific options
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* @ccid_hc_tx_packet_recv: implements feedback processing for the HC-sender
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* @ccid_hc_tx_send_packet: implements the sending part of the HC-sender
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* @ccid_hc_tx_packet_sent: does accounting for packets in flight by HC-sender
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* @ccid_hc_{r,t}x_get_info: INET_DIAG information for HC-receiver/sender
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* @ccid_hc_{r,t}x_getsockopt: socket options specific to HC-receiver/sender
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*/
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struct ccid_operations {
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unsigned char ccid_id;
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__u32 ccid_ccmps;
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const char *ccid_name;
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struct module *ccid_owner;
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struct kmem_cache *ccid_hc_rx_slab,
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*ccid_hc_tx_slab;
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__u32 ccid_hc_rx_obj_size,
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ccid_hc_tx_obj_size;
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/* Interface Routines */
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int (*ccid_hc_rx_init)(struct ccid *ccid, struct sock *sk);
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int (*ccid_hc_tx_init)(struct ccid *ccid, struct sock *sk);
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void (*ccid_hc_rx_exit)(struct sock *sk);
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void (*ccid_hc_tx_exit)(struct sock *sk);
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void (*ccid_hc_rx_packet_recv)(struct sock *sk,
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struct sk_buff *skb);
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int (*ccid_hc_rx_parse_options)(struct sock *sk,
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unsigned char option,
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unsigned char len, u16 idx,
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unsigned char* value);
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int (*ccid_hc_rx_insert_options)(struct sock *sk,
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struct sk_buff *skb);
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void (*ccid_hc_tx_packet_recv)(struct sock *sk,
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struct sk_buff *skb);
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int (*ccid_hc_tx_parse_options)(struct sock *sk,
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unsigned char option,
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unsigned char len, u16 idx,
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unsigned char* value);
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int (*ccid_hc_tx_send_packet)(struct sock *sk,
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struct sk_buff *skb);
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void (*ccid_hc_tx_packet_sent)(struct sock *sk,
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int more, unsigned int len);
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void (*ccid_hc_rx_get_info)(struct sock *sk,
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struct tcp_info *info);
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void (*ccid_hc_tx_get_info)(struct sock *sk,
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struct tcp_info *info);
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int (*ccid_hc_rx_getsockopt)(struct sock *sk,
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const int optname, int len,
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u32 __user *optval,
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int __user *optlen);
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int (*ccid_hc_tx_getsockopt)(struct sock *sk,
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const int optname, int len,
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u32 __user *optval,
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int __user *optlen);
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};
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extern int ccid_register(struct ccid_operations *ccid_ops);
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extern int ccid_unregister(struct ccid_operations *ccid_ops);
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struct ccid {
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struct ccid_operations *ccid_ops;
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char ccid_priv[0];
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};
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static inline void *ccid_priv(const struct ccid *ccid)
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{
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return (void *)ccid->ccid_priv;
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}
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extern bool ccid_support_check(u8 const *ccid_array, u8 array_len);
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extern int ccid_get_builtin_ccids(u8 **ccid_array, u8 *array_len);
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extern int ccid_getsockopt_builtin_ccids(struct sock *sk, int len,
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char __user *, int __user *);
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extern struct ccid *ccid_new(unsigned char id, struct sock *sk, int rx,
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gfp_t gfp);
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static inline int ccid_get_current_rx_ccid(struct dccp_sock *dp)
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{
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struct ccid *ccid = dp->dccps_hc_rx_ccid;
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if (ccid == NULL || ccid->ccid_ops == NULL)
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return -1;
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return ccid->ccid_ops->ccid_id;
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}
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static inline int ccid_get_current_tx_ccid(struct dccp_sock *dp)
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{
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struct ccid *ccid = dp->dccps_hc_tx_ccid;
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if (ccid == NULL || ccid->ccid_ops == NULL)
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return -1;
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return ccid->ccid_ops->ccid_id;
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}
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extern void ccid_hc_rx_delete(struct ccid *ccid, struct sock *sk);
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extern void ccid_hc_tx_delete(struct ccid *ccid, struct sock *sk);
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static inline int ccid_hc_tx_send_packet(struct ccid *ccid, struct sock *sk,
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struct sk_buff *skb)
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{
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int rc = 0;
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if (ccid->ccid_ops->ccid_hc_tx_send_packet != NULL)
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rc = ccid->ccid_ops->ccid_hc_tx_send_packet(sk, skb);
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return rc;
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}
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static inline void ccid_hc_tx_packet_sent(struct ccid *ccid, struct sock *sk,
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int more, unsigned int len)
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{
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if (ccid->ccid_ops->ccid_hc_tx_packet_sent != NULL)
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ccid->ccid_ops->ccid_hc_tx_packet_sent(sk, more, len);
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}
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static inline void ccid_hc_rx_packet_recv(struct ccid *ccid, struct sock *sk,
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struct sk_buff *skb)
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{
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if (ccid->ccid_ops->ccid_hc_rx_packet_recv != NULL)
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ccid->ccid_ops->ccid_hc_rx_packet_recv(sk, skb);
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}
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static inline void ccid_hc_tx_packet_recv(struct ccid *ccid, struct sock *sk,
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struct sk_buff *skb)
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{
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if (ccid->ccid_ops->ccid_hc_tx_packet_recv != NULL)
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ccid->ccid_ops->ccid_hc_tx_packet_recv(sk, skb);
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}
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static inline int ccid_hc_tx_parse_options(struct ccid *ccid, struct sock *sk,
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unsigned char option,
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unsigned char len, u16 idx,
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unsigned char* value)
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{
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int rc = 0;
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if (ccid->ccid_ops->ccid_hc_tx_parse_options != NULL)
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rc = ccid->ccid_ops->ccid_hc_tx_parse_options(sk, option, len, idx,
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value);
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return rc;
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}
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static inline int ccid_hc_rx_parse_options(struct ccid *ccid, struct sock *sk,
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unsigned char option,
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unsigned char len, u16 idx,
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unsigned char* value)
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{
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int rc = 0;
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if (ccid->ccid_ops->ccid_hc_rx_parse_options != NULL)
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rc = ccid->ccid_ops->ccid_hc_rx_parse_options(sk, option, len, idx, value);
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return rc;
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}
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static inline int ccid_hc_rx_insert_options(struct ccid *ccid, struct sock *sk,
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struct sk_buff *skb)
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{
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if (ccid->ccid_ops->ccid_hc_rx_insert_options != NULL)
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return ccid->ccid_ops->ccid_hc_rx_insert_options(sk, skb);
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return 0;
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}
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static inline void ccid_hc_rx_get_info(struct ccid *ccid, struct sock *sk,
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struct tcp_info *info)
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{
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if (ccid->ccid_ops->ccid_hc_rx_get_info != NULL)
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ccid->ccid_ops->ccid_hc_rx_get_info(sk, info);
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}
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static inline void ccid_hc_tx_get_info(struct ccid *ccid, struct sock *sk,
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struct tcp_info *info)
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{
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if (ccid->ccid_ops->ccid_hc_tx_get_info != NULL)
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ccid->ccid_ops->ccid_hc_tx_get_info(sk, info);
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}
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static inline int ccid_hc_rx_getsockopt(struct ccid *ccid, struct sock *sk,
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const int optname, int len,
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u32 __user *optval, int __user *optlen)
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{
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int rc = -ENOPROTOOPT;
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if (ccid->ccid_ops->ccid_hc_rx_getsockopt != NULL)
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rc = ccid->ccid_ops->ccid_hc_rx_getsockopt(sk, optname, len,
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optval, optlen);
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return rc;
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}
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static inline int ccid_hc_tx_getsockopt(struct ccid *ccid, struct sock *sk,
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const int optname, int len,
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u32 __user *optval, int __user *optlen)
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{
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int rc = -ENOPROTOOPT;
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if (ccid->ccid_ops->ccid_hc_tx_getsockopt != NULL)
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rc = ccid->ccid_ops->ccid_hc_tx_getsockopt(sk, optname, len,
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optval, optlen);
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return rc;
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}
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#endif /* _CCID_H */
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