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#ifndef GUARD_RECVBUFF_H
#define GUARD_RECVBUFF_H
#include "ntp.h"
#include "ntp_net.h"
#include "ntp_lists.h"
#include "nts.h"
/*
* recvbuf memory management
*/
#define RECV_INIT 10 /* 10 buffers initially */
#define RECV_LOWAT 3 /* when we're down to three buffers get more */
#define RECV_INC 5 /* get 5 more at a time */
#define RECV_TOOMANY 40 /* this is way too many buffers */
/*
* Format of a recvbuf. Back when ntpd did true asynchronous
* I/O, these were used by the asynchronous receive routine to store
* incoming packets and related information. Now, with kernel
* time stamps on received packets, that complexity has been dropped.
*/
/*
* The maximum length NTP packet contains the NTP header, one Autokey
* request, one Autokey response, the MAC, and extension fields
* (Autokey has been removed from NTPsec, but we need to deal with
* the largest packets from legacy versions). The only free parameter
* here is the maximum length of extension data.
*/
#define RX_BUFF_SIZE (LEN_PKT_NOMAC + MAX_MAC_LEN + MAX_EXT_LEN)
typedef struct recvbuf recvbuf_t;
struct recvbuf {
recvbuf_t * link; /* next in list */
sockaddr_u recv_srcadr; /* where packet came from */
struct netendpt * dstadr; /* address pkt arrived on */
SOCKET fd; /* fd on which it was received */
l_fp recv_time; /* time of arrival */
size_t recv_length; /* number of octets received */
uint8_t recv_buffer[RX_BUFF_SIZE];
struct parsed_pkt pkt; /* host-order copy of data from wire */
bool keyid_present;
keyid_t keyid;
int mac_len;
bool extens_present;
struct ntspacket_t ntspacket;
#ifdef REFCLOCK
struct peer * recv_peer;
#endif /* REFCLOCK */
};
extern void init_recvbuff(unsigned int); /* not really pure */
/* freerecvbuf - make a single recvbuf available for reuse
*/
extern void freerecvbuf(struct recvbuf *);
/* Get a free buffer (typically used so an async
* read can directly place data into the buffer
*
* The buffer is removed from the free list. Make sure
* you put it back with freerecvbuf() or
*/
/* signal safe - no malloc */
extern struct recvbuf *get_free_recv_buffer(void);
/* number of recvbufs on freelist */
extern unsigned long free_recvbuffs(void); /* not really pure */
extern unsigned long total_recvbuffs(void); /* not really pure */
extern unsigned long lowater_additions(void); /* not really pure */
#endif /* GUARD_RECVBUFF_H */
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