70e212f913
Interfaces for OSPF and RIP could be configured to use (and request) TTL 255 for traffic to direct neighbors. Thanks to Simon Dickhoven for the original patch for RIPng.
121 lines
4.2 KiB
C
121 lines
4.2 KiB
C
/*
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* BIRD Socket Interface
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*
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* (c) 1998--2004 Martin Mares <mj@ucw.cz>
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*
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* Can be freely distributed and used under the terms of the GNU GPL.
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*/
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#ifndef _BIRD_SOCKET_H_
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#define _BIRD_SOCKET_H_
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#include <errno.h>
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#include "lib/resource.h"
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typedef struct birdsock {
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resource r;
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pool *pool; /* Pool where incoming connections should be allocated (for SK_xxx_PASSIVE) */
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int type; /* Socket type */
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void *data; /* User data */
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ip_addr saddr, daddr; /* IPA_NONE = unspecified */
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unsigned sport, dport; /* 0 = unspecified (for IP: protocol type) */
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int tos; /* TOS / traffic class, -1 = default */
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int priority; /* Local socket priority, -1 = default */
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int ttl; /* Time To Live, -1 = default */
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u32 flags;
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struct iface *iface; /* Interface; specify this for broad/multicast sockets */
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byte *rbuf, *rpos; /* NULL=allocate automatically */
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unsigned rbsize;
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int (*rx_hook)(struct birdsock *, int size); /* NULL=receiving turned off, returns 1 to clear rx buffer */
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byte *tbuf, *tpos; /* NULL=allocate automatically */
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byte *ttx; /* Internal */
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unsigned tbsize;
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void (*tx_hook)(struct birdsock *);
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void (*err_hook)(struct birdsock *, int); /* errno or zero if EOF */
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/* Information about received datagrams (UDP, RAW), valid in rx_hook */
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ip_addr faddr, laddr; /* src (From) and dst (Local) address of the datagram */
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unsigned fport; /* src port of the datagram */
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unsigned lifindex; /* local interface that received the datagram */
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/* laddr and lifindex are valid only if SKF_LADDR_RX flag is set to request it */
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int fd; /* System-dependent data */
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node n;
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void *rbuf_alloc, *tbuf_alloc;
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char *password; /* Password for MD5 authentication */
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} sock;
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sock *sock_new(pool *); /* Allocate new socket */
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#define sk_new(X) sock_new(X) /* Wrapper to avoid name collision with OpenSSL */
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int sk_open(sock *); /* Open socket */
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int sk_send(sock *, unsigned len); /* Send data, <0=err, >0=ok, 0=sleep */
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int sk_send_to(sock *, unsigned len, ip_addr to, unsigned port); /* sk_send to given destination */
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void sk_reallocate(sock *); /* Free and allocate tbuf & rbuf */
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void sk_dump_all(void);
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int sk_set_ttl(sock *s, int ttl); /* Set transmit TTL for given socket */
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int sk_set_min_ttl(sock *s, int ttl); /* Set minimal accepted TTL for given socket */
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/* Add or remove security associations for given passive socket */
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int sk_set_md5_auth(sock *s, ip_addr a, struct iface *ifa, char *passwd);
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int sk_rx_ready(sock *s);
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/* Prepare UDP or IP socket to multicasting. s->iface and s->ttl must be set */
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int sk_setup_multicast(sock *s);
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int sk_join_group(sock *s, ip_addr maddr);
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int sk_leave_group(sock *s, ip_addr maddr);
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#ifdef IPV6
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int sk_set_ipv6_checksum(sock *s, int offset);
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int sk_set_icmp_filter(sock *s, int p1, int p2);
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#endif
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int sk_set_broadcast(sock *s, int enable);
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static inline int
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sk_send_buffer_empty(sock *sk)
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{
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return sk->tbuf == sk->tpos;
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}
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extern int sk_priority_control; /* Suggested priority for control traffic, should be sysdep define */
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/* Socket flags */
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#define SKF_V6ONLY 1 /* Use IPV6_V6ONLY socket option */
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#define SKF_LADDR_RX 2 /* Report local address for RX packets */
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#define SKF_LADDR_TX 4 /* Allow to specify local address for TX packets */
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#define SKF_TTL_RX 8 /* Report TTL / Hop Limit for RX packets */
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/*
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* Socket types SA SP DA DP IF TTL SendTo (?=may, -=must not, *=must)
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*/
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#define SK_TCP_PASSIVE 0 /* ? * - - - ? - */
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#define SK_TCP_ACTIVE 1 /* ? ? * * - ? - */
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#define SK_TCP 2
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#define SK_UDP 3 /* ? ? ? ? ? ? ? */
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#define SK_IP 5 /* ? - ? * ? ? ? */
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#define SK_MAGIC 7 /* Internal use by sysdep code */
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#define SK_UNIX_PASSIVE 8
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#define SK_UNIX 9
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/*
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* For SK_UDP or SK_IP sockets setting DA/DP allows to use sk_send(),
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* otherwise sk_send_to() must be used.
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*
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* For SK_IP sockets setting DP specifies protocol number, which is used
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* for both receiving and sending.
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*
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* For multicast on SK_UDP or SK_IP sockets set IF and TTL,
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* call sk_setup_multicast() to enable multicast on that socket,
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* and then use sk_join_group() and sk_leave_group() to manage
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* a set of received multicast groups.
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*/
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#endif
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