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131 lines
6.3 KiB
131 lines
6.3 KiB
5 months ago
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/*
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* include/haproxy/protocol-t.h
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* This file defines the structures used by generic network protocols.
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*
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* Copyright (C) 2000-2020 Willy Tarreau - w@1wt.eu
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation, version 2.1
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* exclusively.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef _HAPROXY_PROTOCOL_T_H
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#define _HAPROXY_PROTOCOL_T_H
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <import/eb32tree.h>
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#include <haproxy/api-t.h>
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/* some pointer types referenced below */
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struct listener;
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struct receiver;
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struct connection;
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/*
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* Custom network family for str2sa parsing. Should be ok to do this since
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* sa_family_t is standardized as an unsigned integer
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*/
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#define AF_CUST_EXISTING_FD (AF_MAX + 1)
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#define AF_CUST_SOCKPAIR (AF_MAX + 2)
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#define AF_CUST_MAX (AF_MAX + 3)
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/*
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* Test in case AF_CUST_MAX overflows the sa_family_t (unsigned int)
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*/
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#if (AF_CUST_MAX < AF_MAX)
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# error "Can't build on the target system, AF_CUST_MAX overflow"
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#endif
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/* max length of a protocol name, including trailing zero */
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#define PROTO_NAME_LEN 16
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/* flags for ->connect() */
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#define CONNECT_HAS_DATA 0x00000001 /* There's data available to be sent */
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#define CONNECT_DELACK_SMART_CONNECT 0x00000002 /* Use a delayed ACK if the backend has tcp-smart-connect */
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#define CONNECT_DELACK_ALWAYS 0x00000004 /* Use a delayed ACK */
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#define CONNECT_CAN_USE_TFO 0x00000008 /* We can use TFO for this connection */
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/* protocol families define standard functions acting on a given address family
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* for a socket implementation, such as AF_INET/PF_INET for example.
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*/
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struct proto_fam {
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char name[PROTO_NAME_LEN]; /* family name, zero-terminated */
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int sock_domain; /* socket domain, as passed to socket() */
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sa_family_t sock_family; /* socket family, for sockaddr */
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socklen_t sock_addrlen; /* socket address length, used by bind() */
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int l3_addrlen; /* layer3 address length, used by hashes */
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int (*addrcmp)(const struct sockaddr_storage *, const struct sockaddr_storage *); /* compare addresses (like memcmp) */
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int (*bind)(struct receiver *rx, char **errmsg); /* bind a receiver */
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int (*get_src)(int fd, struct sockaddr *, socklen_t, int dir); /* syscall used to retrieve src addr */
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int (*get_dst)(int fd, struct sockaddr *, socklen_t, int dir); /* syscall used to retrieve dst addr */
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void (*set_port)(struct sockaddr_storage *, int port); /* set the port on the address; NULL if not implemented */
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};
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/* This structure contains all information needed to easily handle a protocol.
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* Its primary goal is to ease listeners maintenance. Specifically, the
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* bind() primitive must be used before any fork(). rx_suspend()/rx_resume()
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* return >0 on success, 0 if rx stopped, -1 on failure to proceed. rx_* may
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* be null if the protocol doesn't provide direct access to the receiver.
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*/
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struct protocol {
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char name[PROTO_NAME_LEN]; /* protocol name, zero-terminated */
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struct proto_fam *fam; /* protocol family */
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int ctrl_type; /* control layer type (SOCK_STREAM/SOCK_DGRAM) */
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int sock_type; /* socket type, as passed to socket() */
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int sock_prot; /* socket protocol, as passed to socket() */
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/* functions acting on the listener */
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void (*add)(struct protocol *p, struct listener *l); /* add a listener for this protocol */
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int (*listen)(struct listener *l, char *errmsg, int errlen); /* start a listener */
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void (*enable)(struct listener *l); /* enable receipt of new connections */
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void (*disable)(struct listener *l); /* disable receipt of new connections */
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void (*unbind)(struct listener *l); /* unbind the listener and possibly its receiver */
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int (*suspend)(struct listener *l); /* try to suspend the listener */
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int (*resume)(struct listener *l); /* try to resume a suspended listener */
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struct connection *(*accept_conn)(struct listener *l, int *status); /* accept a new connection */
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/* functions acting on connections */
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void (*ctrl_init)(struct connection *); /* completes initialization of the connection */
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void (*ctrl_close)(struct connection *); /* completes release of the connection */
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int (*connect)(struct connection *, int flags); /* connect function if any, see below for flags values */
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int (*drain)(struct connection *); /* drain pending data; 0=failed, >0=success */
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int (*check_events)(struct connection *conn, int event_type); /* subscribe to socket events */
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void (*ignore_events)(struct connection *conn, int event_type); /* unsubscribe from socket events */
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/* functions acting on the receiver */
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int (*rx_suspend)(struct receiver *rx); /* temporarily suspend this receiver for a soft restart */
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int (*rx_resume)(struct receiver *rx); /* try to resume a temporarily suspended receiver */
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void (*rx_enable)(struct receiver *rx); /* enable receiving on the receiver */
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void (*rx_disable)(struct receiver *rx); /* disable receiving on the receiver */
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void (*rx_unbind)(struct receiver *rx); /* unbind the receiver, most often closing the FD */
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int (*rx_listening)(const struct receiver *rx); /* is the receiver listening ? 0=no, >0=OK, <0=unrecoverable */
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/* default I/O handler */
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void (*default_iocb)(int fd); /* generic I/O handler (typically accept callback) */
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struct list receivers; /* list of receivers using this protocol (under proto_lock) */
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int nb_receivers; /* number of receivers (under proto_lock) */
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struct list list; /* list of registered protocols (under proto_lock) */
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};
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#endif /* _HAPROXY_PROTOCOL_T_H */
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/*
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* Local variables:
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* c-indent-level: 8
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* c-basic-offset: 8
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* End:
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*/
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