ref: e4191b8d11ae31efe758abfa5b48bf0b99c912a4
dir: /sys/src/9/ip/ip.h/
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 Ndb Ndb;
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 Routehint Routehint;
typedef struct Translation Translation;
typedef struct Routerparams Routerparams;
typedef struct Hostparams Hostparams;
typedef struct v6params v6params;
#pragma incomplete Arp
#pragma incomplete Ipself
#pragma incomplete Ipselftab
#pragma incomplete IP
#pragma incomplete Netlog
enum
{
Addrlen= 64,
Maxproto= 20,
Maxincall= 10,
Nchans= 1024,
MAClen= 8, /* 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 */
IP_FO= 0x1fff, /* v4: Fragment offset */
IP4HDR= IP_HLEN4<<2, /* sizeof(Ip4hdr) */
IP_MAX= 64*1024, /* Max. Internet packet size, v4 & v6 */
v4MINTU= 68, /* The minimum MTU for IPv4 is 68 bytes */
/* 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 */
};
/*
* cache for route and arp table lookups.
* one per Conv so conversations with a
* fixed target can avoid the per packet
* lookup overhead.
*/
struct Routehint
{
Route *r; /* last route used */
ulong rgen; /* routetable generation for *r */
Arpent *a; /* last arp entry used */
};
/*
* 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 *nextiphash;
uchar trans; /* 0 = conv, 1 = foward, 2 = backward */
uchar match;
ushort lport; /* local port number */
ushort rport; /* remote port number */
uchar laddr[IPaddrlen]; /* local IP address */
uchar raddr[IPaddrlen]; /* remote IP address */
};
struct Ipht
{
Lock;
Iphash *tab[Nipht];
};
void iphtadd(Ipht*, Iphash*);
void iphtrem(Ipht*, Iphash*);
Iphash *iphtlook(Ipht *ht, uchar *sa, ushort sp, uchar *da, ushort dp);
/*
* NAT entry.
*
* This holds the 5 tuple as two Iphashes.
* The "forward" hash matches the the packets from
* the source that need to be translated and
* "backward" matches the packets coming back
* from the destination.
*/
struct Translation
{
Translation *next;
Translation **link;
ulong time;
Iphash forward;
#define iphforward(h) ((Translation*)((char*)(h) - (char*)&((Translation*)0)->forward))
Iphash backward;
#define iphbackward(h) ((Translation*)((char*)(h) - (char*)&((Translation*)0)->backward))
/* used for forwarding to the source */
Routehint;
};
Translation *transforward(Proto *p, Ipht *ht, uchar *sa, int sp, uchar *da, int dp, Route *r);
Translation *transbackward(Proto *p, Iphash *iph);
/*
* one per conversation directory
*/
struct Conv
{
QLock;
int x; /* conversation index */
Proto* p;
uint ttl; /* max time to live */
uint tos; /* type of service */
uchar restricted; /* remote port is restricted */
uchar ignoreadvice; /* don't terminate connection on icmp errors */
uchar ipversion;
Iphash;
#define iphconv(h) ((Conv*)((char*)(h) - (char*)&((Conv*)0)->Iphash))
char *owner; /* protections */
int perm;
int inuse; /* opens of listen/data/ctl */
int length;
int state;
/* udp specific */
int headers; /* data src/dst headers in 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 */
Rendez cr;
char cerr[ERRMAX];
QLock listenq;
Rendez listenr;
Ipmulti *multi; /* multicast bindings for this interface */
void* ptcl; /* protocol specific stuff */
Routehint;
};
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, Routehint *rh);
/* for arming interfaces to receive multicast */
void (*addmulti)(Ipifc *ifc, uchar *a, uchar *ia);
void (*delmulti)(Ipifc *ifc, uchar *a, uchar *ia);
/* process packets written to 'data' */
void (*pktin)(Fs *f, Ipifc *ifc, Block *bp);
/* address resolution */
void (*areg)(Fs *f, Ipifc *ifc, Iplifc *lifc, uchar *ip);
/* 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 type; /* route type */
uchar tentative; /* =1 => v6 dup disc on, =0 => confirmed unique */
uchar onlink; /* =1 => onlink, =0 offlink. */
uchar autoflag; /* v6 autonomous flag */
ulong validlt; /* v6 valid lifetime */
ulong preflt; /* v6 preferred lifetime */
ulong 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 lifc */
Iplink *next; /* free list */
ulong expire;
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 */
void *arg; /* medium specific */
uchar reflect; /* allow forwarded packets to go out the same interface */
uchar reassemble; /* reassemble IP packets before forwarding to this interface */
uchar ifcid; /* incremented each 'bind/unbind/add/remove' */
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 */
int speed; /* link speed in bits per second */
int delay; /* burst delay in ms */
int burst; /* burst delay in bytes */
int load; /* bytes in flight */
ulong ticks;
};
/*
* one per multicast-lifc pair used by a Conv
*/
struct Ipmulti
{
uchar ma[IPaddrlen];
uchar ia[IPaddrlen];
Ipmulti *next;
};
/*
* 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*, Ipifc*, 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;
/* network address translation */
Translation* translations;
Block* (*forward)(Proto*, Block*, Route*);
void *priv;
};
int unusedlport(Proto *p);
struct Ndb
{
QLock;
char *buf;
int len;
int vers;
long mtime;
};
/*
* 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 findipifc */
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;
Ndb ndb; /* an ndb entry for this interface */
};
struct v6params
{
Routerparams rp; /* v6 params, one copy per node now */
Hostparams hp;
};
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,
Logil= 1<<4,
Logicmp= 1<<5,
Logudp= 1<<6,
Logcompress= 1<<7,
Logilmsg= 1<<8,
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,
Logtrans= 1<<19,
};
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 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 */
Rtrans= (1<<7), /* this route translates source address (NAT) */
Rsrc= (1<<8), /* source specific route */
};
struct RouteTree
{
Route *mid;
Route *left;
Route *right;
Ipifc *ifc;
uchar ifcid; /* must match ifc->ifcid */
uchar depth;
ushort type;
char tag[4];
int ref;
};
struct V4route
{
ulong address;
ulong endaddress;
ulong source;
ulong endsource;
uchar gate[IPv4addrlen];
};
struct V6route
{
ulong address[IPllen];
ulong endaddress[IPllen];
ulong source[IPllen];
ulong endsource[IPllen];
uchar gate[IPaddrlen];
};
struct Route
{
RouteTree;
union {
V6route v6;
V4route v4;
};
};
extern void addroute(Fs *f, uchar *a, uchar *mask, uchar *s, uchar *smask, uchar *gate, int type, Ipifc *ifc, char *tag);
extern void delroute(Fs *f, uchar *a, uchar *mask, uchar *s, uchar *smask, uchar *gate, int type, Ipifc *ifc, char *tag);
extern Route* v4lookup(Fs *f, uchar *a, uchar *s, Routehint *rh);
extern Route* v6lookup(Fs *f, uchar *a, uchar *s, Routehint *rh);
extern Route* v4source(Fs *f, uchar *a, uchar *s);
extern Route* v6source(Fs *f, uchar *a, uchar *s);
extern long routeread(Fs *f, char*, ulong, int);
extern long routewrite(Fs *f, Chan*, char*, int);
extern void routetype(int type, char p[8]);
/*
* 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];
Arpent *hash;
Arpent *nextrxt; /* re-transmit chain */
Block *hold;
Block *last;
Ipifc *ifc;
uchar ifcid; /* must match ifc->ifcid */
uchar state;
uchar rxtsrem; /* re-tranmissions remaining */
ulong ctime; /* time entry was created or refreshed */
ulong utime; /* time entry was last used */
};
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 *mac, Routehint *rh);
extern void arprelease(Arp*, Arpent *a);
extern void arpcontinue(Arp*, Arpent *a);
extern Block* arpresolve(Arp*, Arpent *a, uchar *mac, Routehint *rh);
extern int arpenter(Fs*, int version, uchar *ip, uchar *mac, int maclen, uchar *ia, Ipifc *ifc, int refresh);
extern int arpforme(Fs*, int version, uchar *targ, uchar *src, Ipifc *ifc);
extern void ndpsendsol(Fs*, Arpent*);
/*
* ipaux.c
*/
extern int parseether(uchar*, char*);
extern vlong parseip(uchar*, char*);
extern vlong parseipmask(uchar*, char*, int);
extern vlong parseipandmask(uchar*, uchar*, char*, 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*);
extern int ipismulticast(uchar *ip);
extern int convipvers(Conv *c);
extern void hnputs_csum(void *p, ushort v, uchar *pcsum);
#define ipmove(x, y) memmove(x, y, IPaddrlen)
#define ipcmp(x, y) ( (x)[IPaddrlen-1] != (y)[IPaddrlen-1] || memcmp(x, y, IPaddrlen) )
#define isv4mcast(ip4) ((ip4)[0] >= 0xe0 && (ip4)[0] < 0xf0)
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 void ipifcoput(Ipifc *ifc, Block *bp, int version, uchar *ip, Routehint *rh);
extern int ipforme(Fs*, uchar *addr);
extern Ipifc* findipifc(Fs*, uchar *local, uchar *remote, int type);
extern Ipifc* findipifcstr(Fs *f, char *s);
extern void findlocalip(Fs*, uchar *local, uchar *remote);
extern int ipv4local(Ipifc *ifc, uchar *local, int prefixlen, uchar *remote);
extern int ipv6local(Ipifc *ifc, uchar *local, int prefixlen, uchar *remote);
extern Iplifc* iplocalonifc(Ipifc *ifc, uchar *ip);
extern Iplifc* ipremoteonifc(Ipifc *ifc, uchar *ip);
extern Ipmulti* ipifcgetmulti(Fs *f, Ipifc *ifc, uchar *ma);
extern void ipifcaddmulti(Conv *c, uchar *ma, uchar *ia);
extern void ipifcdelmulti(Conv *c, uchar *ma, uchar *ia);
extern char* ipifcadd(Ipifc *ifc, char **argv, int argc, int tentative, Iplifc *lifcp);
extern char* ipifcdel(Ipifc *ifc, char **argv, int argc);
extern long ipselftabread(Fs*, char *a, ulong offset, int n);
extern char* ipifcadd6(Ipifc *ifc, char**argv, int argc);
extern char* ipifcdel6(Ipifc *ifc, char**argv, int argc);
extern char* mediumunbindifc(Ipifc *ifc);
/*
* ip.c
*/
extern void iprouting(Fs*, int);
extern void icmpnohost(Fs*, Ipifc*, Block*, Routehint*);
extern void icmpnoconv(Fs*, Ipifc*, Block*);
extern void icmpcantfrag(Fs*, Ipifc*, Block*, int);
extern void icmpttlexceeded(Fs*, Ipifc*, Block*);
extern void icmpproxyadvice(Fs*, Ipifc*, Block*, uchar*);
extern ushort ipcsum(uchar*);
extern void ipiput4(Fs*, Ipifc*, Block*);
extern void ipiput6(Fs*, Ipifc*, Block*);
extern int ipoput4(Fs*, Block*, Ipifc*, int, int, Routehint*);
extern int ipoput6(Fs*, Block*, Ipifc*, int, int, Routehint*);
extern int ipstats(Fs*, char*, int);
extern ushort ptclbsum(uchar*, int);
extern ushort ptclcsum(Block*, int, int);
extern void ip_init(Fs*);
extern void ip_init_6(Fs*);
/*
* tcp.c
*/
extern void tcpmssclamp(uchar*, int, int);
/*
* 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 (*multicastreportfn)(Fs*, Ipifc*, uchar*, uchar*, int);