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/* $OpenBSD: dhcpd.h,v 1.1 2017/03/17 14:45:16 rzalamena Exp $ */
/*
* Copyright (c) 2017 Rafael Zalamena <rzalamena@openbsd.org>
* Copyright (c) 2004 Henning Brauer <henning@openbsd.org>
* Copyright (c) 1995, 1996, 1997, 1998, 1999
* The Internet Software Consortium. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of The Internet Software Consortium nor the names
* of its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INTERNET SOFTWARE CONSORTIUM AND
* CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE INTERNET SOFTWARE CONSORTIUM OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* This software has been written for the Internet Software Consortium
* by Ted Lemon <mellon@fugue.com> in cooperation with Vixie
* Enterprises. To learn more about the Internet Software Consortium,
* see ``http://www.vix.com/isc''. To learn more about Vixie
* Enterprises, see ``http://www.vix.com''.
*/
#ifndef _DHCPD_H_
#define _DHCPD_H_
#include <sys/queue.h>
#define DHCRELAY6_USER "_dhcp"
/* Maximum size of client hardware address. */
#define CHADDR_SIZE 16
/* Packet context for assembly/disassembly. */
struct packet_ctx {
/* Client or server socket descriptor. */
int pc_sd;
/* Layer 2 address information. */
uint8_t pc_htype;
uint8_t pc_hlen;
uint8_t pc_smac[CHADDR_SIZE];
uint8_t pc_dmac[CHADDR_SIZE];
/* Layer 3 address information. */
uint16_t pc_ethertype;
struct sockaddr_storage pc_srcorig;
struct sockaddr_storage pc_src;
struct sockaddr_storage pc_dst;
/* Relay Agent Information data. */
uint8_t *pc_raidata;
size_t pc_raidatalen;
uint32_t pc_enterpriseno;
uint8_t *pc_remote;
size_t pc_remotelen;
};
struct hardware {
u_int8_t htype;
u_int8_t hlen;
u_int8_t haddr[CHADDR_SIZE];
};
/* DHCP relaying modes. */
enum dhcp_relay_mode {
DRM_UNKNOWN,
DRM_LAYER2,
DRM_LAYER3,
};
struct interface_info {
struct hardware hw_address;
struct in_addr primary_address;
char name[IFNAMSIZ];
int rfdesc;
int wfdesc;
unsigned char *rbuf;
size_t rbuf_max;
size_t rbuf_offset;
size_t rbuf_len;
struct ifreq ifr;
int noifmedia;
int errors;
int dead;
uint16_t index;
int ipv6; /* Has any IPv6 address. */
int gipv6; /* Has global IPv6 address. */
struct in6_addr linklocal; /* IPv6 link-local address. */
TAILQ_ENTRY(interface_info) entry;
};
TAILQ_HEAD(intfq, interface_info);
struct timeout {
struct timeout *next;
time_t when;
void (*func)(void *);
void *what;
};
struct protocol {
struct protocol *next;
int fd;
void (*handler)(struct protocol *);
void *local;
};
struct server_list {
struct interface_info *intf;
struct sockaddr_storage to;
int fd;
int siteglobaladdr;
TAILQ_ENTRY(server_list) entry;
};
TAILQ_HEAD(serverq, server_list);
/* bpf.c */
int if_register_bpf(struct interface_info *);
void if_register_send(struct interface_info *);
void if_register_receive(struct interface_info *);
ssize_t send_packet(struct interface_info *,
void *, size_t, struct packet_ctx *);
ssize_t receive_packet(struct interface_info *, unsigned char *, size_t,
struct packet_ctx *);
/* dispatch.c */
extern void (*bootp_packet_handler)(struct interface_info *,
void *, size_t, struct packet_ctx *);
void setup_iflist(void);
struct interface_info *iflist_getbyname(const char *);
struct interface_info *iflist_getbyindex(unsigned int);
struct interface_info *iflist_getbyaddr6(struct in6_addr *);
int if_hasaddress(struct interface_info *);
struct interface_info *register_interface(const char *,
void (*)(struct protocol *));
void dispatch(void);
void got_one(struct protocol *);
void add_protocol(char *, int, void (*)(struct protocol *), void *);
void remove_protocol(struct protocol *);
/* packet.c */
void assemble_hw_header(unsigned char *, int *, struct packet_ctx *);
void assemble_udp_ip6_header(unsigned char *, int *, struct packet_ctx *,
unsigned char *, int);
ssize_t decode_hw_header(unsigned char *, int, struct packet_ctx *);
ssize_t decode_udp_ip6_header(unsigned char *, int, struct packet_ctx *,
size_t);
/* dhcrelay6.c */
const char *v6addr2str(struct in6_addr *);
extern struct intfq intflist;
extern struct serverq svlist;
extern time_t cur_time;
static inline struct sockaddr_in6 *
ss2sin6(struct sockaddr_storage *ss)
{
return ((struct sockaddr_in6 *)ss);
}
#endif /* _DHCPD_H_ */
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