/* SPDX-License-Identifier: GPL-2.0-only *//* * Stream Parser * * Copyright (c) 2016 Tom Herbert <tom@herbertland.com> */ #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 msgs;	unsigned long long bytes;	unsigned int mem_fail;	unsigned int need_more_hdr;	unsigned int msg_too_big;	unsigned int msg_timeouts;	unsigned int bad_hdr_len;}; struct strp_aggr_stats {	unsigned long long msgs;	unsigned long long bytes;	unsigned int mem_fail;	unsigned int need_more_hdr;	unsigned int msg_too_big;	unsigned int msg_timeouts;	unsigned int bad_hdr_len;	unsigned int aborts;	unsigned int interrupted;	unsigned int 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);	void (*lock)(struct strparser *strp);	void (*unlock)(struct strparser *strp);}; struct strp_msg {	int full_len;	int offset;}; struct _strp_msg {	/* Internal cb structure. struct strp_msg must be first for passing	 * to upper layer.	 */	struct strp_msg strp;	int accum_len;}; struct sk_skb_cb {#define SK_SKB_CB_PRIV_LEN 20	unsigned char data[SK_SKB_CB_PRIV_LEN];	/* align strp on cache line boundary within skb->cb[] */	unsigned char pad[4];	struct _strp_msg strp; 	/* strp users' data follows */	struct tls_msg {		u8 control;	} tls;	/* temp_reg is a temporary register used for bpf_convert_data_end_access	 * when dst_reg == src_reg.	 */	u64 temp_reg;}; static inline struct strp_msg *strp_msg(struct sk_buff *skb){	return (struct strp_msg *)((void *)skb->cb +		offsetof(struct sk_skb_cb, strp));} /* Structure for an attached lower socket */struct strparser {	struct sock *sk; 	u32 stopped : 1;	u32 paused : 1;	u32 aborted : 1;	u32 interrupted : 1;	u32 unrecov_intr : 1; 	struct sk_buff **skb_nextp;	struct sk_buff *skb_head;	unsigned int need_bytes;	struct delayed_work msg_timer_work;	struct work_struct 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->paused = 1;} /* May be called without holding lock for attached socket */void strp_unpause(struct strparser *strp);/* Must be called with process lock held (lock_sock) */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(msgs);	SAVE_PSOCK_STATS(bytes);	SAVE_PSOCK_STATS(mem_fail);	SAVE_PSOCK_STATS(need_more_hdr);	SAVE_PSOCK_STATS(msg_too_big);	SAVE_PSOCK_STATS(msg_timeouts);	SAVE_PSOCK_STATS(bad_hdr_len);#undef SAVE_PSOCK_STATS 	if (strp->aborted)		agg_stats->aborts++;	if (strp->interrupted)		agg_stats->interrupted++;	if (strp->unrecov_intr)		agg_stats->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(msgs);	SAVE_PSOCK_STATS(bytes);	SAVE_PSOCK_STATS(mem_fail);	SAVE_PSOCK_STATS(need_more_hdr);	SAVE_PSOCK_STATS(msg_too_big);	SAVE_PSOCK_STATS(msg_timeouts);	SAVE_PSOCK_STATS(bad_hdr_len);	SAVE_PSOCK_STATS(aborts);	SAVE_PSOCK_STATS(interrupted);	SAVE_PSOCK_STATS(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 *sk,	      const struct strp_callbacks *cb);void strp_data_ready(struct strparser *strp);int strp_process(struct strparser *strp, struct sk_buff *orig_skb,		 unsigned int orig_offset, size_t orig_len,		 size_t max_msg_size, long timeo); #endif /* __NET_STRPARSER_H_ */