socket.h

/*
 * Copyright (c) 1995 Danny Gasparovski.
 *
 * Please read the file COPYRIGHT for the
 * terms and conditions of the copyright.
 */

#ifndef _SLIRP_SOCKET_H_
#define _SLIRP_SOCKET_H_

#define SO_EXPIRE 240000
#define SO_EXPIREFAST 10000

/*
 * Our socket structure
 */

struct socket {
    struct socket *so_next, *so_prev; /* For a linked list of sockets */

    int s; /* The actual socket */

    Slirp *slirp; /* managing slirp instance */

    /* XXX union these with not-yet-used sbuf params */
    struct mbuf *so_m; /* Pointer to the original SYN packet,
                        * for non-blocking connect()'s, and
                        * PING reply's */
    struct tcpiphdr *so_ti; /* Pointer to the original ti within
                             * so_mconn, for non-blocking connections */
    int so_urgc;
    struct in_addr so_faddr; /* foreign host table entry */
    struct in_addr so_laddr; /* local host table entry */
    uint16_t so_fport; /* foreign port */
    uint16_t so_lport; /* local port */

    uint8_t so_iptos; /* Type of service */
    uint8_t so_emu; /* Is the socket emulated? */

    u_char so_type; /* Type of socket, UDP or TCP */
    int so_state; /* internal state flags SS_*, below */

    struct tcpcb *so_tcpcb; /* pointer to TCP protocol control block */
    u_int so_expire; /* When the socket will expire */

    int so_queued; /* Number of packets queued from this socket */
    int so_nqueued; /* Number of packets queued in a row
                     * Used to determine when to "downgrade" a session
                     * from fastq to batchq */

    struct sbuf so_rcv; /* Receive buffer */
    struct sbuf so_snd; /* Send buffer */
    void *extra; /* Extra pointer */
};


/*
 * Socket state bits. (peer means the host on the Internet,
 * local host means the host on the other end of the modem)
 */
#define SS_NOFDREF 0x001 /* No fd reference */

#define SS_ISFCONNECTING \
    0x002 /* Socket is connecting to peer (non-blocking connect()'s) */
#define SS_ISFCONNECTED 0x004 /* Socket is connected to peer */
#define SS_FCANTRCVMORE \
    0x008 /* Socket can't receive more from peer (for half-closes) */
#define SS_FCANTSENDMORE \
    0x010 /* Socket can't send more to peer (for half-closes) */
#define SS_FWDRAIN \
    0x040 /* We received a FIN, drain data and set SS_FCANTSENDMORE */

#define SS_CTL 0x080
#define SS_FACCEPTCONN \
    0x100 /* Socket is accepting connections from a host on the internet */
#define SS_FACCEPTONCE \
    0x200 /* If set, the SS_FACCEPTCONN socket will die after one accept */

#define SS_PERSISTENT_MASK 0xf000 /* Unremovable state bits */
#define SS_HOSTFWD 0x1000 /* Socket describes host->guest forwarding */
#define SS_INCOMING \
    0x2000 /* Connection was initiated by a host on the internet */

struct socket *solookup(struct socket *, struct in_addr, u_int, struct in_addr,
                        u_int);
struct socket *socreate(Slirp *);
void sofree(struct socket *);
int soread(struct socket *);
void sorecvoob(struct socket *);
int sosendoob(struct socket *);
int sowrite(struct socket *);
void sorecvfrom(struct socket *);
int sosendto(struct socket *, struct mbuf *);
struct socket *tcp_listen(Slirp *, uint32_t, u_int, uint32_t, u_int, int);
void soisfconnecting(register struct socket *);
void soisfconnected(register struct socket *);
void sofwdrain(struct socket *);
struct iovec; /* For win32 */
size_t sopreprbuf(struct socket *so, struct iovec *iov, int *np);
int soreadbuf(struct socket *so, const char *buf, int size);

#endif /* _SOCKET_H_ */