radvd.h

/*
 *
 *   Authors:
 *    Pedro Roque		<roque@di.fc.ul.pt>
 *    Lars Fenneberg		<lf@elemental.net>
 *
 *   This software is Copyright 1996,1997 by the above mentioned author(s),
 *   All Rights Reserved.
 *
 *   The license which is distributed with this software in the file COPYRIGHT
 *   applies to this software. If your distribution is missing this file, you
 *   may request it from <pekkas@netcore.fi>.
 *
 */

#ifndef RADV_H
#define RADV_H

#include "config.h"
#include "includes.h"
#include "defaults.h"
#include "log.h"

#define CONTACT_EMAIL	"Pekka Savola <pekkas@netcore.fi>"

extern int sock;

#define min(a,b)	(((a) < (b)) ? (a) : (b))

struct AdvPrefix;
struct Clients;

#define HWADDR_MAX 16
#define USER_HZ 100

struct Interface {
	char			Name[IFNAMSIZ];	/* interface name */

	struct in6_addr		if_addr;
	unsigned int		if_index;

	uint8_t			init_racount;	/* Initial RAs */

	uint8_t			if_hwaddr[HWADDR_MAX];
	int			if_hwaddr_len;
	int			if_prefix_len;
	int			if_maxmtu;

	int			cease_adv;

	struct timeval		last_ra_time;

	int			IgnoreIfMissing;
	int			AdvSendAdvert;
	double			MaxRtrAdvInterval;
	double			MinRtrAdvInterval;
	double			MinDelayBetweenRAs;
	int			AdvManagedFlag;
	int			AdvOtherConfigFlag;
	uint32_t		AdvLinkMTU;
	uint32_t		AdvReachableTime;
	uint32_t		AdvRetransTimer;
	uint8_t			AdvCurHopLimit;
	int32_t			AdvDefaultLifetime;   /* XXX: really uint16_t but we need to use -1 */
	int			AdvDefaultPreference;
	int			AdvSourceLLAddress;
	int			UnicastOnly;

	/* Mobile IPv6 extensions */
	int			AdvIntervalOpt;
	int			AdvHomeAgentInfo;
	int			AdvHomeAgentFlag;
	uint16_t		HomeAgentPreference;
	int32_t			HomeAgentLifetime;    /* XXX: really uint16_t but we need to use -1 */

	/* NEMO extensions */
	int			AdvMobRtrSupportFlag;

	struct AdvPrefix	*AdvPrefixList;
	struct AdvRoute		*AdvRouteList;
	struct AdvRDNSS		*AdvRDNSSList;
	struct AdvDNSSL		*AdvDNSSLList;
	struct Clients		*ClientList;
	struct timeval		last_multicast;
	struct timeval		next_multicast;

	/* Info whether this interface has failed in the past (and may need to be reinitialized) */
	int			HasFailed;

	struct Interface	*next;
};

struct Clients {
	struct in6_addr		Address;
	struct Clients		*next;
};

struct AdvPrefix {
	struct in6_addr		Prefix;
	uint8_t			PrefixLen;

	int			AdvOnLinkFlag;
	int			AdvAutonomousFlag;
	uint32_t		AdvValidLifetime;
	uint32_t		AdvPreferredLifetime;
	int			DeprecatePrefixFlag;
	int			DecrementLifetimesFlag;

	uint32_t		curr_validlft;
	uint32_t		curr_preferredlft;

	/* Mobile IPv6 extensions */
	int             	AdvRouterAddr;

	/* 6to4 etc. extensions */
	char			if6to4[IFNAMSIZ];
	int			enabled;
	int			AutoSelected;

	/* Select prefixes from this interface. */
	char			if6[IFNAMSIZ];

	struct AdvPrefix	*next;
};

/* More-Specific Routes extensions */

struct AdvRoute {
	struct in6_addr		Prefix;
	uint8_t			PrefixLen;

	int			AdvRoutePreference;
	uint32_t		AdvRouteLifetime;
	int			RemoveRouteFlag;

	struct AdvRoute		*next;
};

/* Options for DNS configuration */

struct AdvRDNSS {
	int 			AdvRDNSSNumber;
	uint32_t		AdvRDNSSLifetime;
	int			FlushRDNSSFlag;
	struct in6_addr		AdvRDNSSAddr1;
	struct in6_addr		AdvRDNSSAddr2;
	struct in6_addr		AdvRDNSSAddr3;

	struct AdvRDNSS 	*next;
};

struct AdvDNSSL {
	uint32_t		AdvDNSSLLifetime;

	int			AdvDNSSLNumber;
	int			FlushDNSSLFlag;
	char			**AdvDNSSLSuffixes;

	struct AdvDNSSL 	*next;
};

/* Mobile IPv6 extensions */

struct AdvInterval {
	uint8_t			type;
	uint8_t			length;
	uint16_t		reserved;
	uint32_t		adv_ival;
};

struct HomeAgentInfo {
	uint8_t			type;
	uint8_t			length;
	uint16_t		flags_reserved;
	uint16_t		preference;
	uint16_t		lifetime;
};


/* gram.y */
int yyparse(void);

/* scanner.l */
int yylex(void);

/* radvd.c */
int check_ip6_forwarding(void);
void reload_config(void);
void reset_prefix_lifetimes(void);

/* timer.c */
struct timeval next_timeval(double next);
int timevaldiff(struct timeval const *a, struct timeval const *b);
int next_time_msec(struct Interface const * iface);
int expired(struct Interface const * iface);

/* device.c */
int setup_deviceinfo(struct Interface *);
int check_device(struct Interface *);
int setup_linklocal_addr(struct Interface *);
int setup_allrouters_membership(struct Interface *);
int check_allrouters_membership(struct Interface *);
int get_v4addr(const char *, unsigned int *);
int set_interface_var(const char *, const char *, const char *, uint32_t);
int set_interface_linkmtu(const char *, uint32_t);
int set_interface_curhlim(const char *, uint8_t);
int set_interface_reachtime(const char *, uint32_t);
int set_interface_retranstimer(const char *, uint32_t);

/* interface.c */
void iface_init_defaults(struct Interface *);
void prefix_init_defaults(struct AdvPrefix *);
void route_init_defaults(struct AdvRoute *, struct Interface *);
void rdnss_init_defaults(struct AdvRDNSS *, struct Interface *);
void dnssl_init_defaults(struct AdvDNSSL *, struct Interface *);
int check_iface(struct Interface *);

/* socket.c */
int open_icmpv6_socket(void);

/* send.c */
int send_ra(struct Interface *iface, struct in6_addr *dest);
int send_ra_forall(struct Interface *iface, struct in6_addr *dest);

/* process.c */
void process(struct Interface *, unsigned char *, int,
	struct sockaddr_in6 *, struct in6_pktinfo *, int);

/* recv.c */
int recv_rs_ra(unsigned char *, struct sockaddr_in6 *, struct in6_pktinfo **, int *);

/* util.c */
void mdelay(double);
double rand_between(double, double);
void print_addr(struct in6_addr *, char *);
int check_rdnss_presence(struct AdvRDNSS *, struct in6_addr *);
int check_dnssl_presence(struct AdvDNSSL *, const char *);
ssize_t readn(int fd, void *buf, size_t count);
ssize_t writen(int fd, const void *buf, size_t count);

/* privsep.c */
int privsep_init(void);
int privsep_enabled(void);
int privsep_interface_linkmtu(const char *iface, uint32_t mtu);
int privsep_interface_curhlim(const char *iface, uint32_t hlim);
int privsep_interface_reachtime(const char *iface, uint32_t rtime);
int privsep_interface_retranstimer(const char *iface, uint32_t rettimer);

/*
 * compat hacks in case libc and kernel get out of sync:
 *
 * glibc 2.4 and uClibc 0.9.29 introduce IPV6_RECVPKTINFO etc. and change IPV6_PKTINFO
 * This is only supported in Linux kernel >= 2.6.14
 *
 * This is only an approximation because the kernel version that libc was compiled against
 * could be older or newer than the one being run.  But this should not be a problem --
 * we just keep using the old kernel interface.
 *
 * these are placed here because they're needed in all of socket.c, recv.c and send.c
 */
#ifdef __linux__
#  if defined IPV6_RECVHOPLIMIT || defined IPV6_RECVPKTINFO
#    include <linux/version.h>
#    if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,14)
#      if defined IPV6_RECVHOPLIMIT && defined IPV6_2292HOPLIMIT
#        undef IPV6_RECVHOPLIMIT
#        define IPV6_RECVHOPLIMIT IPV6_2292HOPLIMIT
#      endif
#      if defined IPV6_RECVPKTINFO && defined IPV6_2292PKTINFO
#        undef IPV6_RECVPKTINFO
#        undef IPV6_PKTINFO
#        define IPV6_RECVPKTINFO IPV6_2292PKTINFO
#        define IPV6_PKTINFO IPV6_2292PKTINFO
#      endif
#    endif
#  endif
#endif

#endif