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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 <errno.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 / traffic class, -1 = default */
int priority; /* Local socket 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 */
/* Information about received datagrams (UDP, RAW), valid in rx_hook */
ip_addr faddr, laddr; /* src (From) and dst (Local) address of the datagram */
unsigned fport; /* src port of the datagram */
unsigned lifindex; /* local interface that received the datagram */
/* laddr and lifindex are valid only if SKF_LADDR_RX flag is set to request it */
int fd; /* System-dependent data */
int index; /* Index in poll buffer */
node n;
void *rbuf_alloc, *tbuf_alloc;
char *password; /* Password for MD5 authentication */
} sock;
sock *sock_new(pool *); /* Allocate new socket */
#define sk_new(X) sock_new(X) /* Wrapper to avoid name collision with OpenSSL */
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_set_rbsize(sock *s, uint val); /* Resize RX buffer */
void sk_set_tbsize(sock *s, uint val); /* Resize TX buffer, keeping content */
void sk_set_tbuf(sock *s, void *tbuf); /* Switch TX buffer, NULL-> return to internal */
void sk_dump_all(void);
int sk_set_ttl(sock *s, int ttl); /* Set transmit TTL for given socket */
int sk_set_min_ttl(sock *s, int ttl); /* Set minimal accepted TTL for given socket */
/* Add or remove security associations for given passive socket */
int sk_set_md5_auth(sock *s, ip_addr a, struct iface *ifa, 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);
int sk_set_icmp_filter(sock *s, int p1, int p2);
#endif
int sk_set_broadcast(sock *s, int enable);
static inline int
sk_send_buffer_empty(sock *sk)
{
return sk->tbuf == sk->tpos;
}
extern int sk_priority_control; /* Suggested priority for control traffic, should be sysdep define */
/* Socket flags */
#define SKF_V6ONLY 1 /* Use IPV6_V6ONLY socket option */
#define SKF_LADDR_RX 2 /* Report local address for RX packets */
#define SKF_TTL_RX 4 /* Report TTL / Hop Limit for RX packets */
#define SKF_BIND 8 /* Bind datagram socket to given source address */
#define SKF_THREAD 0x100 /* Socked used in thread, Do not add to main loop */
#define SKF_TRUNCATED 0x200 /* Received packet was truncated, set by IO layer */
#define SKF_HDRINCL 0x400 /* Used internally */
#define SKF_PKTINFO 0x800 /* Used internally */
/*
* 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
/*
* For SK_UDP or SK_IP sockets setting DA/DP allows to use sk_send(),
* otherwise sk_send_to() must be used.
*
* For SK_IP sockets setting DP specifies protocol number, which is used
* for both receiving and sending.
*
* For multicast on SK_UDP or SK_IP sockets set IF and TTL,
* call sk_setup_multicast() to enable multicast on that socket,
* and then use sk_join_group() and sk_leave_group() to manage
* a set of received multicast groups.
*
* For datagram (SK_UDP, SK_IP) sockets, there are two ways to handle
* source address. The socket could be bound to it using bind()
* syscall, but that also forbids the reception of multicast packets,
* or the address could be set on per-packet basis using platform
* dependent options (but these are not available in some corner
* cases). The first way is used when SKF_BIND is specified, the
* second way is used otherwise.
*/
#endif
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