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https://gitlab.labs.nic.cz/labs/bird.git
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87a02489f3
Add option to socket interface for nonlocal binding, i.e. binding to an IP address that is not present on interfaces. This behaviour is enabled when SKF_FREEBIND socket flag is set. For Linux systems, it is implemented by IP_FREEBIND socket flag. Minor changes done by commiter.
180 lines
7.1 KiB
C
180 lines
7.1 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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#ifdef HAVE_LIBSSH
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#define LIBSSH_LEGACY_0_4
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#include <libssh/libssh.h>
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#endif
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#ifdef HAVE_LIBSSH
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struct ssh_sock {
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const char *username; /* (Required) SSH user name */
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const char *server_hostkey_path; /* (Optional) Filepath to the SSH public key of remote side, can be knownhost file */
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const char *client_privkey_path; /* (Optional) Filepath to the SSH private key of BIRD */
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const char *subsystem; /* (Optional) Name of SSH subsytem */
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ssh_session session; /* Internal */
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ssh_channel channel; /* Internal */
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int state; /* Internal */
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#define SK_SSH_CONNECT 0 /* Start state */
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#define SK_SSH_SERVER_KNOWN 1 /* Internal */
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#define SK_SSH_USERAUTH 2 /* Internal */
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#define SK_SSH_CHANNEL 3 /* Internal */
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#define SK_SSH_SESSION 4 /* Internal */
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#define SK_SSH_SUBSYSTEM 5 /* Internal */
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#define SK_SSH_ESTABLISHED 6 /* Final state */
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};
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#endif
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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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int subtype; /* Socket subtype */
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void *data; /* User data */
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ip_addr saddr, daddr; /* IPA_NONE = unspecified */
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const char *host; /* Alternative to daddr, NULL = unspecified */
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uint 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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struct iface *vrf; /* Related VRF instance, NULL if global */
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byte *rbuf, *rpos; /* NULL=allocate automatically */
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uint fast_rx; /* RX has higher priority in event loop */
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uint rbsize;
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int (*rx_hook)(struct birdsock *, uint 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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uint 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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uint fport; /* src port of the datagram */
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uint 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 af; /* System-dependend adress family (e.g. AF_INET) */
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int fd; /* System-dependent data */
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int index; /* Index in poll buffer */
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int rcv_ttl; /* TTL of last received datagram */
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node n;
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void *rbuf_alloc, *tbuf_alloc;
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const char *password; /* Password for MD5 authentication */
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const char *err; /* Error message */
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struct ssh_sock *ssh; /* Used in SK_SSH */
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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_rx_ready(sock *s);
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int sk_send(sock *, uint len); /* Send data, <0=err, >0=ok, 0=sleep */
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int sk_send_to(sock *, uint len, ip_addr to, uint 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_set_rbsize(sock *s, uint val); /* Resize RX buffer */
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void sk_set_tbsize(sock *s, uint val); /* Resize TX buffer, keeping content */
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void sk_set_tbuf(sock *s, void *tbuf); /* Switch TX buffer, NULL-> return to internal */
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void sk_dump_all(void);
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int sk_is_ipv4(sock *s); /* True if socket is IPv4 */
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int sk_is_ipv6(sock *s); /* True if socket is IPv6 */
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static inline int sk_tx_buffer_empty(sock *sk)
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{ return sk->tbuf == sk->tpos; }
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int sk_setup_multicast(sock *s); /* Prepare UDP or IP socket for multicasting */
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int sk_join_group(sock *s, ip_addr maddr); /* Join multicast group on sk iface */
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int sk_leave_group(sock *s, ip_addr maddr); /* Leave multicast group on sk iface */
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int sk_setup_broadcast(sock *s);
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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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int sk_set_md5_auth(sock *s, ip_addr local, ip_addr remote, int pxlen, struct iface *ifa, const char *passwd, int setkey);
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int sk_set_ipv6_checksum(sock *s, int offset);
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int sk_set_icmp6_filter(sock *s, int p1, int p2);
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void sk_log_error(sock *s, const char *p);
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byte * sk_rx_buffer(sock *s, int *len); /* Temporary */
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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 0x02 /* Use IPV6_V6ONLY socket option */
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#define SKF_LADDR_RX 0x04 /* Report local address for RX packets */
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#define SKF_TTL_RX 0x08 /* Report TTL / Hop Limit for RX packets */
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#define SKF_BIND 0x10 /* Bind datagram socket to given source address */
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#define SKF_HIGH_PORT 0x20 /* Choose port from high range if possible */
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#define SKF_FREEBIND 0x40 /* Allow socket to bind to a nonlocal address */
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#define SKF_THREAD 0x100 /* Socked used in thread, Do not add to main loop */
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#define SKF_TRUNCATED 0x200 /* Received packet was truncated, set by IO layer */
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#define SKF_HDRINCL 0x400 /* Used internally */
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#define SKF_PKTINFO 0x800 /* Used internally */
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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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#define SK_SSH_ACTIVE 10 /* - - * * - ? - DA = host */
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#define SK_SSH 11
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/*
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* Socket subtypes
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*/
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#define SK_IPV4 1
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#define SK_IPV6 2
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/*
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* For TCP/IP sockets, Address family (IPv4 or IPv6) can be specified either
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* explicitly (SK_IPV4 or SK_IPV6) or implicitly (based on saddr, daddr). But
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* these specifications must be consistent.
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*
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* For SK_UDP or SK_IP sockets setting DA/DP allows to use sk_send(), otherwise
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* 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 for
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* 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, call
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* sk_setup_multicast() to enable multicast on that socket, and then use
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* sk_join_group() and sk_leave_group() to manage a set of received multicast
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* groups.
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*
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* For datagram (SK_UDP, SK_IP) sockets, there are two ways to handle source
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* address. The socket could be bound to it using bind() syscall, but that also
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* forbids the reception of multicast packets, or the address could be set on
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* per-packet basis using platform dependent options (but these are not
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* available in some corner cases). The first way is used when SKF_BIND is
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* specified, the second way is used otherwise.
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*/
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#endif
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