/* * 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