Import sources from 2011-03-30 iso image

1 files changed, 744 insertions, 0 deletions

diff --git a/sys/src/9/ip/ip.h b/sys/src/9/ip/ip.h
new file mode 100755
index 000000000..2d0a48635
--- /dev/null
+++ b/sys/src/9/ip/ip.h
@@ -0,0 +1,744 @@
+typedef struct	Conv	Conv;
+typedef struct	Fragment4 Fragment4;
+typedef struct	Fragment6 Fragment6;
+typedef struct	Fs	Fs;
+typedef union	Hwaddr	Hwaddr;
+typedef struct	IP	IP;
+typedef struct	IPaux	IPaux;
+typedef struct	Ip4hdr	Ip4hdr;
+typedef struct	Ipfrag	Ipfrag;
+typedef struct	Ipself	Ipself;
+typedef struct	Ipselftab	Ipselftab;
+typedef struct	Iplink	Iplink;
+typedef struct	Iplifc	Iplifc;
+typedef struct	Ipmulti	Ipmulti;
+typedef struct	Ipifc	Ipifc;
+typedef struct	Iphash	Iphash;
+typedef struct	Ipht	Ipht;
+typedef struct	Netlog	Netlog;
+typedef struct	Medium	Medium;
+typedef struct	Proto	Proto;
+typedef struct	Arpent	Arpent;
+typedef struct	Arp Arp;
+typedef struct	Route	Route;
+
+typedef struct	Routerparams	Routerparams;
+typedef struct 	Hostparams	Hostparams;
+typedef struct 	v6router	v6router;
+typedef struct	v6params	v6params;
+
+#pragma incomplete Arp
+#pragma incomplete Ipself
+#pragma incomplete Ipselftab
+#pragma incomplete IP
+#pragma incomplete Netlog
+
+enum
+{
+	Addrlen=	64,
+	Maxproto=	20,
+	Nhash=		64,
+	Maxincall=	10,
+	Nchans=		1024,
+	MAClen=		16,		/* longest mac address */
+
+	MAXTTL=		255,
+	DFLTTOS=	0,
+
+	IPaddrlen=	16,
+	IPv4addrlen=	4,
+	IPv4off=	12,
+	IPllen=		4,
+
+	/* ip versions */
+	V4=		4,
+	V6=		6,
+	IP_VER4= 	0x40,
+	IP_VER6=	0x60,
+	IP_HLEN4=	5,		/* v4: Header length in words */
+	IP_DF=		0x4000,		/* v4: Don't fragment */
+	IP_MF=		0x2000,		/* v4: More fragments */
+	IP4HDR=		20,		/* sizeof(Ip4hdr) */
+	IP_MAX=		64*1024,	/* Max. Internet packet size, v4 & v6 */
+
+	/* 2^Lroot trees in the root table */
+	Lroot=		10,
+
+	Maxpath =	64,
+};
+
+enum
+{
+	Idle=		0,
+	Announcing=	1,
+	Announced=	2,
+	Connecting=	3,
+	Connected=	4,
+};
+
+/* MIB II counters */
+enum
+{
+	Forwarding,
+	DefaultTTL,
+	InReceives,
+	InHdrErrors,
+	InAddrErrors,
+	ForwDatagrams,
+	InUnknownProtos,
+	InDiscards,
+	InDelivers,
+	OutRequests,
+	OutDiscards,
+	OutNoRoutes,
+	ReasmTimeout,
+	ReasmReqds,
+	ReasmOKs,
+	ReasmFails,
+	FragOKs,
+	FragFails,
+	FragCreates,
+
+	Nipstats,
+};
+
+struct Fragment4
+{
+	Block*	blist;
+	Fragment4*	next;
+	ulong 	src;
+	ulong 	dst;
+	ushort	id;
+	ulong 	age;
+};
+
+struct Fragment6
+{
+	Block*	blist;
+	Fragment6*	next;
+	uchar 	src[IPaddrlen];
+	uchar 	dst[IPaddrlen];
+	uint	id;
+	ulong 	age;
+};
+
+struct Ipfrag
+{
+	ushort	foff;
+	ushort	flen;
+
+	uchar	payload[];
+};
+
+#define IPFRAGSZ offsetof(Ipfrag, payload[0])
+
+/* an instance of IP */
+struct IP
+{
+	uvlong		stats[Nipstats];
+
+	QLock		fraglock4;
+	Fragment4*	flisthead4;
+	Fragment4*	fragfree4;
+	Ref		id4;
+
+	QLock		fraglock6;
+	Fragment6*	flisthead6;
+	Fragment6*	fragfree6;
+	Ref		id6;
+
+	int		iprouting;	/* true if we route like a gateway */
+};
+
+/* on the wire packet header */
+struct Ip4hdr
+{
+	uchar	vihl;		/* Version and header length */
+	uchar	tos;		/* Type of service */
+	uchar	length[2];	/* packet length */
+	uchar	id[2];		/* ip->identification */
+	uchar	frag[2];	/* Fragment information */
+	uchar	ttl;      	/* Time to live */
+	uchar	proto;		/* Protocol */
+	uchar	cksum[2];	/* Header checksum */
+	uchar	src[4];		/* IP source */
+	uchar	dst[4];		/* IP destination */
+};
+
+/*
+ *  one per conversation directory
+ */
+struct Conv
+{
+	QLock;
+
+	int	x;			/* conversation index */
+	Proto*	p;
+
+	int	restricted;		/* remote port is restricted */
+	uint	ttl;			/* max time to live */
+	uint	tos;			/* type of service */
+	int	ignoreadvice;		/* don't terminate connection on icmp errors */
+
+	uchar	ipversion;
+	uchar	laddr[IPaddrlen];	/* local IP address */
+	uchar	raddr[IPaddrlen];	/* remote IP address */
+	ushort	lport;			/* local port number */
+	ushort	rport;			/* remote port number */
+
+	char	*owner;			/* protections */
+	int	perm;
+	int	inuse;			/* opens of listen/data/ctl */
+	int	length;
+	int	state;
+
+	int	maxfragsize;		/* If set, used for fragmentation */
+
+	/* udp specific */
+	int	headers;		/* data src/dst headers in udp */
+	int	reliable;		/* true if reliable udp */
+
+	Conv*	incall;			/* calls waiting to be listened for */
+	Conv*	next;
+
+	Queue*	rq;			/* queued data waiting to be read */
+	Queue*	wq;			/* queued data waiting to be written */
+	Queue*	eq;			/* returned error packets */
+	Queue*	sq;			/* snooping queue */
+	Ref	snoopers;		/* number of processes with snoop open */
+
+	QLock	car;
+	Rendez	cr;
+	char	cerr[ERRMAX];
+
+	QLock	listenq;
+	Rendez	listenr;
+
+	Ipmulti	*multi;			/* multicast bindings for this interface */
+
+	void*	ptcl;			/* protocol specific stuff */
+
+	Route	*r;			/* last route used */
+	ulong	rgen;			/* routetable generation for *r */
+};
+
+struct Medium
+{
+	char	*name;
+	int	hsize;		/* medium header size */
+	int	mintu;		/* default min mtu */
+	int	maxtu;		/* default max mtu */
+	int	maclen;		/* mac address length  */
+	void	(*bind)(Ipifc*, int, char**);
+	void	(*unbind)(Ipifc*);
+	void	(*bwrite)(Ipifc *ifc, Block *b, int version, uchar *ip);
+
+	/* for arming interfaces to receive multicast */
+	void	(*addmulti)(Ipifc *ifc, uchar *a, uchar *ia);
+	void	(*remmulti)(Ipifc *ifc, uchar *a, uchar *ia);
+
+	/* process packets written to 'data' */
+	void	(*pktin)(Fs *f, Ipifc *ifc, Block *bp);
+
+	/* routes for router boards */
+	void	(*addroute)(Ipifc *ifc, int, uchar*, uchar*, uchar*, int);
+	void	(*remroute)(Ipifc *ifc, int, uchar*, uchar*);
+	void	(*flushroutes)(Ipifc *ifc);
+
+	/* for routing multicast groups */
+	void	(*joinmulti)(Ipifc *ifc, uchar *a, uchar *ia);
+	void	(*leavemulti)(Ipifc *ifc, uchar *a, uchar *ia);
+
+	/* address resolution */
+	void	(*ares)(Fs*, int, uchar*, uchar*, int, int);	/* resolve */
+	void	(*areg)(Ipifc*, uchar*);			/* register */
+
+	/* v6 address generation */
+	void	(*pref2addr)(uchar *pref, uchar *ea);
+
+	int	unbindonclose;	/* if non-zero, unbind on last close */
+};
+
+/* logical interface associated with a physical one */
+struct Iplifc
+{
+	uchar	local[IPaddrlen];
+	uchar	mask[IPaddrlen];
+	uchar	remote[IPaddrlen];
+	uchar	net[IPaddrlen];
+	uchar	tentative;	/* =1 => v6 dup disc on, =0 => confirmed unique */
+	uchar	onlink;		/* =1 => onlink, =0 offlink. */
+	uchar	autoflag;	/* v6 autonomous flag */
+	long 	validlt;	/* v6 valid lifetime */
+	long 	preflt;		/* v6 preferred lifetime */
+	long	origint;	/* time when addr was added */
+	Iplink	*link;		/* addresses linked to this lifc */
+	Iplifc	*next;
+};
+
+/* binding twixt Ipself and Iplifc */
+struct Iplink
+{
+	Ipself	*self;
+	Iplifc	*lifc;
+	Iplink	*selflink;	/* next link for this local address */
+	Iplink	*lifclink;	/* next link for this ifc */
+	ulong	expire;
+	Iplink	*next;		/* free list */
+	int	ref;
+};
+
+/* rfc 2461, pp.40—43. */
+
+/* default values, one per stack */
+struct Routerparams {
+	int	mflag;		/* flag: managed address configuration */
+	int	oflag;		/* flag: other stateful configuration */
+	int 	maxraint;	/* max. router adv interval (ms) */
+	int	minraint;	/* min. router adv interval (ms) */
+	int	linkmtu;	/* mtu options */
+	int	reachtime;	/* reachable time */
+	int	rxmitra;	/* retransmit interval */
+	int	ttl;		/* cur hop count limit */
+	int	routerlt;	/* router lifetime */
+};
+
+struct Hostparams {
+	int	rxmithost;
+};
+
+struct Ipifc
+{
+	RWlock;
+
+	Conv	*conv;		/* link to its conversation structure */
+	char	dev[64];	/* device we're attached to */
+	Medium	*m;		/* Media pointer */
+	int	maxtu;		/* Maximum transfer unit */
+	int	mintu;		/* Minumum tranfer unit */
+	int	mbps;		/* megabits per second */
+	void	*arg;		/* medium specific */
+	int	reassemble;	/* reassemble IP packets before forwarding */
+
+	/* these are used so that we can unbind on the fly */
+	Lock	idlock;
+	uchar	ifcid;		/* incremented each 'bind/unbind/add/remove' */
+	int	ref;		/* number of proc's using this ipifc */
+	Rendez	wait;		/* where unbinder waits for ref == 0 */
+	int	unbinding;
+
+	uchar	mac[MAClen];	/* MAC address */
+
+	Iplifc	*lifc;		/* logical interfaces on this physical one */
+
+	ulong	in, out;	/* message statistics */
+	ulong	inerr, outerr;	/* ... */
+
+	uchar	sendra6;	/* flag: send router advs on this ifc */
+	uchar	recvra6;	/* flag: recv router advs on this ifc */
+	Routerparams rp;	/* router parameters as in RFC 2461, pp.40—43.
+					used only if node is router */
+};
+
+/*
+ *  one per multicast-lifc pair used by a Conv
+ */
+struct Ipmulti
+{
+	uchar	ma[IPaddrlen];
+	uchar	ia[IPaddrlen];
+	Ipmulti	*next;
+};
+
+/*
+ *  hash table for 2 ip addresses + 2 ports
+ */
+enum
+{
+	Nipht=		521,	/* convenient prime */
+
+	IPmatchexact=	0,	/* match on 4 tuple */
+	IPmatchany,		/* *!* */
+	IPmatchport,		/* *!port */
+	IPmatchaddr,		/* addr!* */
+	IPmatchpa,		/* addr!port */
+};
+struct Iphash
+{
+	Iphash	*next;
+	Conv	*c;
+	int	match;
+};
+struct Ipht
+{
+	Lock;
+	Iphash	*tab[Nipht];
+};
+void iphtadd(Ipht*, Conv*);
+void iphtrem(Ipht*, Conv*);
+Conv* iphtlook(Ipht *ht, uchar *sa, ushort sp, uchar *da, ushort dp);
+
+/*
+ *  one per multiplexed protocol
+ */
+struct Proto
+{
+	QLock;
+	char*		name;		/* protocol name */
+	int		x;		/* protocol index */
+	int		ipproto;	/* ip protocol type */
+
+	char*		(*connect)(Conv*, char**, int);
+	char*		(*announce)(Conv*, char**, int);
+	char*		(*bind)(Conv*, char**, int);
+	int		(*state)(Conv*, char*, int);
+	void		(*create)(Conv*);
+	void		(*close)(Conv*);
+	void		(*rcv)(Proto*, Ipifc*, Block*);
+	char*		(*ctl)(Conv*, char**, int);
+	void		(*advise)(Proto*, Block*, char*);
+	int		(*stats)(Proto*, char*, int);
+	int		(*local)(Conv*, char*, int);
+	int		(*remote)(Conv*, char*, int);
+	int		(*inuse)(Conv*);
+	int		(*gc)(Proto*);	/* returns true if any conversations are freed */
+
+	Fs		*f;		/* file system this proto is part of */
+	Conv		**conv;		/* array of conversations */
+	int		ptclsize;	/* size of per protocol ctl block */
+	int		nc;		/* number of conversations */
+	int		ac;
+	Qid		qid;		/* qid for protocol directory */
+	ushort		nextrport;
+
+	void		*priv;
+};
+
+
+/*
+ *  one per IP protocol stack
+ */
+struct Fs
+{
+	RWlock;
+	int	dev;
+
+	int	np;
+	Proto*	p[Maxproto+1];		/* list of supported protocols */
+	Proto*	t2p[256];		/* vector of all protocols */
+	Proto*	ipifc;			/* kludge for ipifcremroute & ipifcaddroute */
+	Proto*	ipmux;			/* kludge for finding an ip multiplexor */
+
+	IP	*ip;
+	Ipselftab	*self;
+	Arp	*arp;
+	v6params	*v6p;
+
+	Route	*v4root[1<<Lroot];	/* v4 routing forest */
+	Route	*v6root[1<<Lroot];	/* v6 routing forest */
+	Route	*queue;			/* used as temp when reinjecting routes */
+
+	Netlog	*alog;
+
+	char	ndb[1024];		/* an ndb entry for this interface */
+	int	ndbvers;
+	long	ndbmtime;
+};
+
+/* one per default router known to host */
+struct v6router {
+	uchar	inuse;
+	Ipifc	*ifc;
+	int	ifcid;
+	uchar	routeraddr[IPaddrlen];
+	long	ltorigin;
+	Routerparams	rp;
+};
+
+struct v6params
+{
+	Routerparams	rp;		/* v6 params, one copy per node now */
+	Hostparams	hp;
+	v6router	v6rlist[3];	/* max 3 default routers, currently */
+	int		cdrouter;	/* uses only v6rlist[cdrouter] if   */
+					/* cdrouter >= 0. */
+};
+
+
+int	Fsconnected(Conv*, char*);
+Conv*	Fsnewcall(Conv*, uchar*, ushort, uchar*, ushort, uchar);
+int	Fspcolstats(char*, int);
+int	Fsproto(Fs*, Proto*);
+int	Fsbuiltinproto(Fs*, uchar);
+Conv*	Fsprotoclone(Proto*, char*);
+Proto*	Fsrcvpcol(Fs*, uchar);
+Proto*	Fsrcvpcolx(Fs*, uchar);
+char*	Fsstdconnect(Conv*, char**, int);
+char*	Fsstdannounce(Conv*, char**, int);
+char*	Fsstdbind(Conv*, char**, int);
+ulong	scalednconv(void);
+void	closeconv(Conv*);
+/*
+ *  logging
+ */
+enum
+{
+	Logip=		1<<1,
+	Logtcp=		1<<2,
+	Logfs=		1<<3,
+	Logicmp=	1<<5,
+	Logudp=		1<<6,
+	Logcompress=	1<<7,
+	Loggre=		1<<9,
+	Logppp=		1<<10,
+	Logtcprxmt=	1<<11,
+	Logigmp=	1<<12,
+	Logudpmsg=	1<<13,
+	Logipmsg=	1<<14,
+	Logrudp=	1<<15,
+	Logrudpmsg=	1<<16,
+	Logesp=		1<<17,
+	Logtcpwin=	1<<18,
+};
+
+void	netloginit(Fs*);
+void	netlogopen(Fs*);
+void	netlogclose(Fs*);
+void	netlogctl(Fs*, char*, int);
+long	netlogread(Fs*, void*, ulong, long);
+void	netlog(Fs*, int, char*, ...);
+void	ifcloginit(Fs*);
+long	ifclogread(Fs*, Chan *,void*, ulong, long);
+void	ifclog(Fs*, uchar *, int);
+void	ifclogopen(Fs*, Chan*);
+void	ifclogclose(Fs*, Chan*);
+
+#pragma varargck argpos netlog	3
+
+/*
+ *  iproute.c
+ */
+typedef	struct RouteTree RouteTree;
+typedef struct Routewalk Routewalk;
+typedef struct V4route V4route;
+typedef struct V6route V6route;
+
+enum
+{
+
+	/* type bits */
+	Rv4=		(1<<0),		/* this is a version 4 route */
+	Rifc=		(1<<1),		/* this route is a directly connected interface */
+	Rptpt=		(1<<2),		/* this route is a pt to pt interface */
+	Runi=		(1<<3),		/* a unicast self address */
+	Rbcast=		(1<<4),		/* a broadcast self address */
+	Rmulti=		(1<<5),		/* a multicast self address */
+	Rproxy=		(1<<6),		/* this route should be proxied */
+};
+
+struct Routewalk
+{
+	int	o;
+	int	h;
+	char*	p;
+	char*	e;
+	void*	state;
+	void	(*walk)(Route*, Routewalk*);
+};
+
+struct	RouteTree
+{
+	Route*	right;
+	Route*	left;
+	Route*	mid;
+	uchar	depth;
+	uchar	type;
+	uchar	ifcid;		/* must match ifc->id */
+	Ipifc	*ifc;
+	char	tag[4];
+	int	ref;
+};
+
+struct V4route
+{
+	ulong	address;
+	ulong	endaddress;
+	uchar	gate[IPv4addrlen];
+};
+
+struct V6route
+{
+	ulong	address[IPllen];
+	ulong	endaddress[IPllen];
+	uchar	gate[IPaddrlen];
+};
+
+struct Route
+{
+	RouteTree;
+
+	union {
+		V6route	v6;
+		V4route v4;
+	};
+};
+extern void	v4addroute(Fs *f, char *tag, uchar *a, uchar *mask, uchar *gate, int type);
+extern void	v6addroute(Fs *f, char *tag, uchar *a, uchar *mask, uchar *gate, int type);
+extern void	v4delroute(Fs *f, uchar *a, uchar *mask, int dolock);
+extern void	v6delroute(Fs *f, uchar *a, uchar *mask, int dolock);
+extern Route*	v4lookup(Fs *f, uchar *a, Conv *c);
+extern Route*	v6lookup(Fs *f, uchar *a, Conv *c);
+extern long	routeread(Fs *f, char*, ulong, int);
+extern long	routewrite(Fs *f, Chan*, char*, int);
+extern void	routetype(int, char*);
+extern void	ipwalkroutes(Fs*, Routewalk*);
+extern void	convroute(Route*, uchar*, uchar*, uchar*, char*, int*);
+
+/*
+ *  devip.c
+ */
+
+/*
+ *  Hanging off every ip channel's ->aux is the following structure.
+ *  It maintains the state used by devip and iproute.
+ */
+struct IPaux
+{
+	char	*owner;		/* the user that did the attach */
+	char	tag[4];
+};
+
+extern IPaux*	newipaux(char*, char*);
+
+/*
+ *  arp.c
+ */
+struct Arpent
+{
+	uchar	ip[IPaddrlen];
+	uchar	mac[MAClen];
+	Medium	*type;			/* media type */
+	Arpent*	hash;
+	Block*	hold;
+	Block*	last;
+	uint	ctime;			/* time entry was created or refreshed */
+	uint	utime;			/* time entry was last used */
+	uchar	state;
+	Arpent	*nextrxt;		/* re-transmit chain */
+	uint	rtime;			/* time for next retransmission */
+	uchar	rxtsrem;
+	Ipifc	*ifc;
+	uchar	ifcid;			/* must match ifc->id */
+};
+
+extern void	arpinit(Fs*);
+extern int	arpread(Arp*, char*, ulong, int);
+extern int	arpwrite(Fs*, char*, int);
+extern Arpent*	arpget(Arp*, Block *bp, int version, Ipifc *ifc, uchar *ip, uchar *h);
+extern void	arprelease(Arp*, Arpent *a);
+extern Block*	arpresolve(Arp*, Arpent *a, Medium *type, uchar *mac);
+extern void	arpenter(Fs*, int version, uchar *ip, uchar *mac, int len, int norefresh);
+
+/*
+ * ipaux.c
+ */
+
+extern int	myetheraddr(uchar*, char*);
+extern vlong	parseip(uchar*, char*);
+extern vlong	parseipmask(uchar*, char*);
+extern char*	v4parseip(uchar*, char*);
+extern void	maskip(uchar *from, uchar *mask, uchar *to);
+extern int	parsemac(uchar *to, char *from, int len);
+extern uchar*	defmask(uchar*);
+extern int	isv4(uchar*);
+extern void	v4tov6(uchar *v6, uchar *v4);
+extern int	v6tov4(uchar *v4, uchar *v6);
+extern int	eipfmt(Fmt*);
+
+#define	ipmove(x, y) memmove(x, y, IPaddrlen)
+#define	ipcmp(x, y) ( (x)[IPaddrlen-1] != (y)[IPaddrlen-1] || memcmp(x, y, IPaddrlen) )
+
+extern uchar IPv4bcast[IPaddrlen];
+extern uchar IPv4bcastobs[IPaddrlen];
+extern uchar IPv4allsys[IPaddrlen];
+extern uchar IPv4allrouter[IPaddrlen];
+extern uchar IPnoaddr[IPaddrlen];
+extern uchar v4prefix[IPaddrlen];
+extern uchar IPallbits[IPaddrlen];
+
+#define	NOW	TK2MS(MACHP(0)->ticks)
+
+/*
+ *  media
+ */
+extern Medium	ethermedium;
+extern Medium	nullmedium;
+extern Medium	pktmedium;
+
+/*
+ *  ipifc.c
+ */
+extern Medium*	ipfindmedium(char *name);
+extern void	addipmedium(Medium *med);
+extern int	ipforme(Fs*, uchar *addr);
+extern int	iptentative(Fs*, uchar *addr);
+extern int	ipisbm(uchar *);
+extern int	ipismulticast(uchar *);
+extern Ipifc*	findipifc(Fs*, uchar *remote, int type);
+extern void	findlocalip(Fs*, uchar *local, uchar *remote);
+extern int	ipv4local(Ipifc *ifc, uchar *addr);
+extern int	ipv6local(Ipifc *ifc, uchar *addr);
+extern int	ipv6anylocal(Ipifc *ifc, uchar *addr);
+extern Iplifc*	iplocalonifc(Ipifc *ifc, uchar *ip);
+extern int	ipproxyifc(Fs *f, Ipifc *ifc, uchar *ip);
+extern int	ipismulticast(uchar *ip);
+extern int	ipisbooting(void);
+extern int	ipifccheckin(Ipifc *ifc, Medium *med);
+extern void	ipifccheckout(Ipifc *ifc);
+extern int	ipifcgrab(Ipifc *ifc);
+extern void	ipifcaddroute(Fs*, int, uchar*, uchar*, uchar*, int);
+extern void	ipifcremroute(Fs*, int, uchar*, uchar*);
+extern void	ipifcremmulti(Conv *c, uchar *ma, uchar *ia);
+extern void	ipifcaddmulti(Conv *c, uchar *ma, uchar *ia);
+extern char*	ipifcrem(Ipifc *ifc, char **argv, int argc);
+extern char*	ipifcadd(Ipifc *ifc, char **argv, int argc, int tentative, Iplifc *lifcp);
+extern long	ipselftabread(Fs*, char *a, ulong offset, int n);
+extern char*	ipifcadd6(Ipifc *ifc, char**argv, int argc);
+/*
+ *  ip.c
+ */
+extern void	iprouting(Fs*, int);
+extern void	icmpnoconv(Fs*, Block*);
+extern void	icmpcantfrag(Fs*, Block*, int);
+extern void	icmpttlexceeded(Fs*, uchar*, Block*);
+extern ushort	ipcsum(uchar*);
+extern void	ipiput4(Fs*, Ipifc*, Block*);
+extern void	ipiput6(Fs*, Ipifc*, Block*);
+extern int	ipoput4(Fs*, Block*, int, int, int, Conv*);
+extern int	ipoput6(Fs*, Block*, int, int, int, Conv*);
+extern int	ipstats(Fs*, char*, int);
+extern ushort	ptclbsum(uchar*, int);
+extern ushort	ptclcsum(Block*, int, int);
+extern void	ip_init(Fs*);
+extern void	update_mtucache(uchar*, ulong);
+extern ulong	restrict_mtu(uchar*, ulong);
+/*
+ * bootp.c
+ */
+extern int	bootpread(char*, ulong, int);
+
+/*
+ *  resolving inferno/plan9 differences
+ */
+char*		commonuser(void);
+char*		commonerror(void);
+
+/*
+ * chandial.c
+ */
+extern Chan*	chandial(char*, char*, char*, Chan**);
+
+/*
+ *  global to all of the stack
+ */
+extern void	(*igmpreportfn)(Ipifc*, uchar*);