/* * Stream Parser * * Copyright (c) 2016 Tom Herbert <tom@herbertland.com> * * 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. */ #ifndef __NET_STRPARSER_H_#define __NET_STRPARSER_H_ #include <linux/skbuff.h>#include <net/sock.h> #define STRP_STATS_ADD(stat, count) ((stat) += (count))#define STRP_STATS_INCR(stat) ((stat)++) struct strp_stats {	unsigned long long rx_msgs;	unsigned long long rx_bytes;	unsigned int rx_mem_fail;	unsigned int rx_need_more_hdr;	unsigned int rx_msg_too_big;	unsigned int rx_msg_timeouts;	unsigned int rx_bad_hdr_len;}; struct strp_aggr_stats {	unsigned long long rx_msgs;	unsigned long long rx_bytes;	unsigned int rx_mem_fail;	unsigned int rx_need_more_hdr;	unsigned int rx_msg_too_big;	unsigned int rx_msg_timeouts;	unsigned int rx_bad_hdr_len;	unsigned int rx_aborts;	unsigned int rx_interrupted;	unsigned int rx_unrecov_intr;}; struct strparser; /* Callbacks are called with lock held for the attached socket */struct strp_callbacks {	int (*parse_msg)(struct strparser *strp, struct sk_buff *skb);	void (*rcv_msg)(struct strparser *strp, struct sk_buff *skb);	int (*read_sock_done)(struct strparser *strp, int err);	void (*abort_parser)(struct strparser *strp, int err);}; struct strp_rx_msg {	int full_len;	int offset;}; static inline struct strp_rx_msg *strp_rx_msg(struct sk_buff *skb){	return (struct strp_rx_msg *)((void *)skb->cb +		offsetof(struct qdisc_skb_cb, data));} /* Structure for an attached lower socket */struct strparser {	struct sock *sk; 	u32 rx_stopped : 1;	u32 rx_paused : 1;	u32 rx_aborted : 1;	u32 rx_interrupted : 1;	u32 rx_unrecov_intr : 1; 	struct sk_buff **rx_skb_nextp;	struct timer_list rx_msg_timer;	struct sk_buff *rx_skb_head;	unsigned int rx_need_bytes;	struct delayed_work rx_delayed_work;	struct work_struct rx_work;	struct strp_stats stats;	struct strp_callbacks cb;}; /* Must be called with lock held for attached socket */static inline void strp_pause(struct strparser *strp){	strp->rx_paused = 1;} /* May be called without holding lock for attached socket */void strp_unpause(struct strparser *strp); static inline void save_strp_stats(struct strparser *strp,				   struct strp_aggr_stats *agg_stats){	/* Save psock statistics in the mux when psock is being unattached. */ #define SAVE_PSOCK_STATS(_stat) (agg_stats->_stat +=		\				 strp->stats._stat)	SAVE_PSOCK_STATS(rx_msgs);	SAVE_PSOCK_STATS(rx_bytes);	SAVE_PSOCK_STATS(rx_mem_fail);	SAVE_PSOCK_STATS(rx_need_more_hdr);	SAVE_PSOCK_STATS(rx_msg_too_big);	SAVE_PSOCK_STATS(rx_msg_timeouts);	SAVE_PSOCK_STATS(rx_bad_hdr_len);#undef SAVE_PSOCK_STATS 	if (strp->rx_aborted)		agg_stats->rx_aborts++;	if (strp->rx_interrupted)		agg_stats->rx_interrupted++;	if (strp->rx_unrecov_intr)		agg_stats->rx_unrecov_intr++;} static inline void aggregate_strp_stats(struct strp_aggr_stats *stats,					struct strp_aggr_stats *agg_stats){#define SAVE_PSOCK_STATS(_stat) (agg_stats->_stat += stats->_stat)	SAVE_PSOCK_STATS(rx_msgs);	SAVE_PSOCK_STATS(rx_bytes);	SAVE_PSOCK_STATS(rx_mem_fail);	SAVE_PSOCK_STATS(rx_need_more_hdr);	SAVE_PSOCK_STATS(rx_msg_too_big);	SAVE_PSOCK_STATS(rx_msg_timeouts);	SAVE_PSOCK_STATS(rx_bad_hdr_len);	SAVE_PSOCK_STATS(rx_aborts);	SAVE_PSOCK_STATS(rx_interrupted);	SAVE_PSOCK_STATS(rx_unrecov_intr);#undef SAVE_PSOCK_STATS } void strp_done(struct strparser *strp);void strp_stop(struct strparser *strp);void strp_check_rcv(struct strparser *strp);int strp_init(struct strparser *strp, struct sock *csk,	      struct strp_callbacks *cb);void strp_data_ready(struct strparser *strp); #endif /* __NET_STRPARSER_H_ */