#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 * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include <net/sock.h> #include <linux/compiler.h> #include <linux/dccp.h> #include <linux/list.h> #include <linux/module.h> #define CCID_MAX 255 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_owner: module which implements/owns this CCID * @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 module *ccid_owner; struct kmem_cache *ccid_hc_rx_slab, *ccid_hc_tx_slab; __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, unsigned char option, unsigned char len, u16 idx, unsigned char* value); 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, unsigned char option, unsigned char len, u16 idx, unsigned char* value); int (*ccid_hc_tx_send_packet)(struct sock *sk, struct sk_buff *skb); void (*ccid_hc_tx_packet_sent)(struct sock *sk, int more, 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 int ccid_register(struct ccid_operations *ccid_ops); extern int ccid_unregister(struct ccid_operations *ccid_ops); 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; } extern struct ccid *ccid_new(unsigned char id, struct sock *sk, int rx, gfp_t gfp); extern struct ccid *ccid_hc_rx_new(unsigned char id, struct sock *sk, gfp_t gfp); extern struct ccid *ccid_hc_tx_new(unsigned char id, struct sock *sk, gfp_t gfp); extern void ccid_hc_rx_delete(struct ccid *ccid, struct sock *sk); extern void ccid_hc_tx_delete(struct ccid *ccid, struct sock *sk); static inline int ccid_hc_tx_send_packet(struct ccid *ccid, struct sock *sk, struct sk_buff *skb) { int rc = 0; if (ccid->ccid_ops->ccid_hc_tx_send_packet != NULL) rc = ccid->ccid_ops->ccid_hc_tx_send_packet(sk, skb); return rc; } static inline void ccid_hc_tx_packet_sent(struct ccid *ccid, struct sock *sk, int more, unsigned int len) { if (ccid->ccid_ops->ccid_hc_tx_packet_sent != NULL) ccid->ccid_ops->ccid_hc_tx_packet_sent(sk, more, 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); } static inline int ccid_hc_tx_parse_options(struct ccid *ccid, struct sock *sk, unsigned char option, unsigned char len, u16 idx, unsigned char* value) { int rc = 0; if (ccid->ccid_ops->ccid_hc_tx_parse_options != NULL) rc = ccid->ccid_ops->ccid_hc_tx_parse_options(sk, option, len, idx, value); return rc; } static inline int ccid_hc_rx_parse_options(struct ccid *ccid, struct sock *sk, unsigned char option, unsigned char len, u16 idx, unsigned char* value) { int rc = 0; if (ccid->ccid_ops->ccid_hc_rx_parse_options != NULL) rc = ccid->ccid_ops->ccid_hc_rx_parse_options(sk, option, len, idx, value); return rc; } 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->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->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 */