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typedef struct Conf Conf;
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typedef struct Ctl Ctl;
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struct Conf
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{
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	/* locally generated */
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	char	*type;
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	char	*dev;
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	char	mpoint[32];
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	int	cfd;			/* ifc control channel */
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	int	dfd;			/* ifc data channel (for ppp) */
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	char	*cputype;
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	uchar	hwa[32];		/* hardware address */
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	int	hwatype;
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	int	hwalen;
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	uchar	cid[32];
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	int	cidlen;
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	char	*baud;
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	/* learned info */
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	uchar	gaddr[IPaddrlen];
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	uchar	laddr[IPaddrlen];
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	uchar	mask[IPaddrlen];
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	uchar	raddr[IPaddrlen];
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	uchar	dns[2*IPaddrlen];
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	uchar	fs[2*IPaddrlen];
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	uchar	auth[2*IPaddrlen];
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	uchar	ntp[IPaddrlen];
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	int	mtu;
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	/* dhcp specific */
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	int	state;
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	int	fd;
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	ulong	xid;
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	ulong	starttime;
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	char	sname[64];
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	char	hostname[32];
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	char	domainname[64];
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	uchar	server[IPaddrlen];	/* server IP address */
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	ulong	offered;		/* offered lease time */
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	ulong	lease;			/* lease time */
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	ulong	resend;			/* # of resends for current state */
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	ulong	timeout;		/* time to timeout - seconds */
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45 
	/*
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	 * IPv6
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	 */
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	/* solicitation specific - XXX add support for IPv6 leases */
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//	ulong	solicit_retries;
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	/* router-advertisement related */
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	uchar	sendra;
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	uchar	recvra;
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	uchar	mflag;
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	uchar	oflag;
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	int 	maxraint; /* rfc2461, p.39: 4sec ≤ maxraint ≤ 1800sec, def 600 */
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	int	minraint;	/* 3sec ≤ minraint ≤ 0.75*maxraint */
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	int	linkmtu;
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	int	reachtime;	/* 3,600,000 msec, default 0 */
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	int	rxmitra;	/* default 0 */
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	int	ttl;		/* default 0 (unspecified) */
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	/* default gateway params */
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	uchar	v6gaddr[IPaddrlen];
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	int	routerlt;	/* router life time */
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	/* prefix related */
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	uchar	v6pref[IPaddrlen];
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	int	prefixlen;
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	uchar	onlink;		/* flag: address is `on-link' */
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	uchar	autoflag;	/* flag: autonomous */
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	ulong	validlt;	/* valid lifetime (seconds) */
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	ulong	preflt;		/* preferred lifetime (seconds) */
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};
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struct Ctl
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{
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	Ctl	*next;
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	char	*ctl;
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};
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82 
extern Ctl *firstctl, **ctll;
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84 
extern Conf conf;
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extern int	noconfig;
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extern int	ipv6auto;
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extern int	debug;
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extern int	dodhcp;
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extern int	dolog;
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extern int	nip;
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extern int	plan9;
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extern int	dupl_disc;
94 
 
95 
extern int	myifc;
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extern char	*vs;
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98 
void	adddefroute(char*, uchar*);
99 
void	binddevice(void);
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void	bootprequest(void);
101 
void	controldevice(void);
102 
void	dhcpquery(int, int);
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void	dhcprecv(void);
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void	dhcpsend(int);
105 
int	dhcptimer(void);
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void	dhcpwatch(int);
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void	doadd(int);
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void	doremove(void);
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void	dounbind(void);
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int	getndb(void);
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int	ipconfig4(void);
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int	ipconfig6(int);
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long	jitter(void);
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void	lookforip(char*);
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void	mkclientid(void);
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int	nipifcs(char*);
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int	openlisten(void);
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uchar	*optaddaddr(uchar*, int, uchar*);
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uchar	*optaddbyte(uchar*, int, int);
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uchar	*optaddstr(uchar*, int, char*);
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uchar	*optadd(uchar*, int, void*, int);
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uchar	*optaddulong(uchar*, int, ulong);
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uchar	*optaddvec(uchar*, int, uchar*, int);
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int	optgetaddrs(uchar*, int, uchar*, int);
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int	optgetaddr(uchar*, int, uchar*);
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int	optgetbyte(uchar*, int);
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int	optgetstr(uchar*, int, char*, int);
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uchar	*optget(uchar*, int, int*);
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ulong	optgetulong(uchar*, int);
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int	optgetvec(uchar*, int, uchar*, int);
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int	parseoptions(uchar *p, int n);
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int	parseverb(char*);
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void	procsetname(char *fmt, ...);
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void	putndb(void);
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ulong	randint(ulong low, ulong hi);
136 
void	tweakservers(void);
137 
void	usage(void);
138 
int	validip(uchar*);
139 
void	warning(char *fmt, ...);
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void	writendb(char*, int, int);
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142 
/*
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 * IPv6
144 
 */
145 
 
146 
void	doipv6(int);
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int	ipconfig6(int);
148 
void	recvra6(void);
149 
void	sendra6(void);
150 
void	v6paraminit(Conf *);
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152 
typedef struct Headers Headers;
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typedef struct Ip4hdr  Ip4hdr;
154 
typedef struct Lladdropt Lladdropt;
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typedef struct Mtuopt Mtuopt;
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typedef struct Prefixopt Prefixopt;
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typedef struct Routeradv Routeradv;
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typedef struct Routersol Routersol;
159 
 
160 
enum {
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	IsRouter 	= 1,
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	IsHostRecv	= 2,
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	IsHostNoRecv	= 3,
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165 
	MAClen		= 6,
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	IPv4		= 4,
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	IPv6		= 6,
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	Defmtu		= 1400,
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171 
	IP_HOPBYHOP	= 0,
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	ICMPv4		= 1,
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	IP_IGMPPROTO	= 2,
174 
	IP_TCPPROTO	= 6,
175 
	IP_UDPPROTO	= 17,
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	IP_ILPROTO	= 40,
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	IP_v6ROUTE	= 43,
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	IP_v6FRAG	= 44,
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	IP_IPsecESP	= 50,
180 
	IP_IPsecAH	= 51,
181 
	IP_v6NOMORE	= 59,
182 
	ICMP6_RS	= 133,
183 
	ICMP6_RA	= 134,
184 
 
185 
	IP_IN_IP	= 41,
186 
};
187 
 
188 
enum {
189 
	MFMASK = 1 << 7,
190 
	OCMASK = 1 << 6,
191 
	OLMASK = 1 << 7,
192 
	AFMASK = 1 << 6,
193 
};
194 
 
195 
enum {
196 
	MAXTTL		= 255,
197 
	D64HLEN		= IPV6HDR_LEN - IPV4HDR_LEN,
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	IP_MAX		= 32*1024,
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};
200 
 
201 
struct Headers {
202 
	uchar	dst[IPaddrlen];
203 
	uchar	src[IPaddrlen];
204 
};
205 
 
206 
struct Routersol {
207 
	uchar	vcf[4];		/* version:4, traffic class:8, flow label:20 */
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	uchar	ploadlen[2];	/* payload length: packet length - 40 */
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	uchar	proto;		/* next header	type */
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	uchar	ttl;		/* hop limit */
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	uchar	src[IPaddrlen];
212 
	uchar	dst[IPaddrlen];
213 
	uchar	type;
214 
	uchar	code;
215 
	uchar	cksum[2];
216 
	uchar	res[4];
217 
};
218 
 
219 
struct Routeradv {
220 
	uchar	vcf[4];		/* version:4, traffic class:8, flow label:20 */
221 
	uchar	ploadlen[2];	/* payload length: packet length - 40 */
222 
	uchar	proto;		/* next header	type */
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	uchar	ttl;		/* hop limit */
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	uchar	src[IPaddrlen];
225 
	uchar	dst[IPaddrlen];
226 
	uchar	type;
227 
	uchar	code;
228 
	uchar	cksum[2];
229 
	uchar	cttl;
230 
	uchar	mor;
231 
	uchar	routerlt[2];
232 
	uchar	rchbltime[4];
233 
	uchar	rxmtimer[4];
234 
};
235 
 
236 
struct Lladdropt {
237 
	uchar	type;
238 
	uchar	len;
239 
	uchar	lladdr[MAClen];
240 
};
241 
 
242 
struct Prefixopt {
243 
	uchar	type;
244 
	uchar	len;
245 
	uchar	plen;
246 
	uchar	lar;
247 
	uchar	validlt[4];
248 
	uchar	preflt[4];
249 
	uchar	reserv[4];
250 
	uchar	pref[IPaddrlen];
251 
};
252 
 
253 
struct Mtuopt {
254 
	uchar	type;
255 
	uchar	len;
256 
	uchar	reserv[2];
257 
	uchar	mtu[4];
258 
};
259 
 
260 
void	ea2lla(uchar *lla, uchar *ea);
261 
void	ipv62smcast(uchar *smcast, uchar *a);