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/*
* BIRD Socket Interface
*
* (c) 1998--2004 Martin Mares <mj@ucw.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#ifndef _BIRD_SOCKET_H_
#define _BIRD_SOCKET_H_
#include "lib/resource.h"
typedef struct birdsock {
resource r;
pool *pool; /* Pool where incoming connections should be allocated (for SK_xxx_PASSIVE) */
int type; /* Socket type */
void *data; /* User data */
ip_addr saddr, daddr; /* IPA_NONE = unspecified */
unsigned sport, dport; /* 0 = unspecified (for IP: protocol type) */
int tos; /* TOS and priority, -1 = default */
int ttl; /* Time To Live, -1 = default */
u32 flags;
struct iface *iface; /* Interface; specify this for broad/multicast sockets */
byte *rbuf, *rpos; /* NULL=allocate automatically */
unsigned rbsize;
int (*rx_hook)(struct birdsock *, int size); /* NULL=receiving turned off, returns 1 to clear rx buffer */
byte *tbuf, *tpos; /* NULL=allocate automatically */
byte *ttx; /* Internal */
unsigned tbsize;
void (*tx_hook)(struct birdsock *);
void (*err_hook)(struct birdsock *, int); /* errno or zero if EOF */
ip_addr faddr; /* For packet protocols: source of current packet */
unsigned fport;
int fd; /* System-dependent data */
node n;
void *rbuf_alloc, *tbuf_alloc;
char *password; /* Password for MD5 authentication */
} sock;
sock *sk_new(pool *); /* Allocate new socket */
int sk_open(sock *); /* Open socket */
int sk_send(sock *, unsigned len); /* Send data, <0=err, >0=ok, 0=sleep */
int sk_send_to(sock *, unsigned len, ip_addr to, unsigned port); /* sk_send to given destination */
void sk_reallocate(sock *); /* Free and allocate tbuf & rbuf */
void sk_dump_all(void);
int sk_set_ttl(sock *s, int ttl); /* Set TTL for given socket */
/* Add or remove security associations for given passive socket */
int sk_set_md5_auth(sock *s, ip_addr a, char *passwd);
int sk_rx_ready(sock *s);
/* Prepare UDP or IP socket to multicasting. s->iface and s->ttl must be set */
int sk_setup_multicast(sock *s);
int sk_join_group(sock *s, ip_addr maddr);
int sk_leave_group(sock *s, ip_addr maddr);
#ifdef IPV6
int sk_set_ipv6_checksum(sock *s, int offset);
#endif
static inline int
sk_send_buffer_empty(sock *sk)
{
return sk->tbuf == sk->tpos;
}
/* Socket flags */
#define SKF_V6ONLY 1 /* Use IPV6_V6ONLY socket option */
/*
* Socket types SA SP DA DP IF TTL SendTo (?=may, -=must not, *=must)
*/
#define SK_TCP_PASSIVE 0 /* ? * - - - ? - */
#define SK_TCP_ACTIVE 1 /* ? ? * * - ? - */
#define SK_TCP 2
#define SK_UDP 3 /* ? ? - - - ? ? */
#define SK_IP 5 /* ? - - * - ? ? */
#define SK_MAGIC 7 /* Internal use by sysdep code */
#define SK_UNIX_PASSIVE 8
#define SK_UNIX 9
/*
* Multicast sockets are slightly different from the other ones:
* If you want to send packets only, just set the destination
* address to the corresponding multicast group and iface to
* the interface to be used. If you also want receiving, set
* source address to the same multicast group as well.
*/
#endif
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