ref: 12fa017f3fc2687d3afb166fd30d9b134abb1da5
dir: /sys/src/cmd/ip/snoopy/icmp6.c/
#include <u.h>
#include <libc.h>
#include <ip.h>
#include "dat.h"
#include "protos.h"
typedef struct Hdr Hdr;
struct Hdr
{ uchar type;
uchar code;
uchar cksum[2]; /* Checksum */
uchar data[1];
};
enum
{
ICMP6LEN= 4,
};
enum
{
Ot, /* type */
Op, /* next protocol */
};
static Field p_fields[] =
{
{"t", Fnum, Ot, "type", } ,
{0}
};
enum
{
/* ICMPv6 types */
EchoReply = 0,
UnreachableV6 = 1,
PacketTooBigV6 = 2,
TimeExceedV6 = 3,
ParamProblemV6 = 4,
Redirect = 5,
EchoRequest = 8,
TimeExceed = 11,
InParmProblem = 12,
Timestamp = 13,
TimestampReply = 14,
InfoRequest = 15,
InfoReply = 16,
AddrMaskRequest = 17,
AddrMaskReply = 18,
EchoRequestV6 = 128,
EchoReplyV6 = 129,
RouterSolicit = 133,
RouterAdvert = 134,
NbrSolicit = 135,
NbrAdvert = 136,
RedirectV6 = 137,
Maxtype6 = 137,
};
static Mux p_mux[] =
{
{"ip6", UnreachableV6, },
{"ip6", RedirectV6, },
{"ip6", TimeExceedV6, },
{0},
};
char *icmpmsg6[256] =
{
[EchoReply] "EchoReply",
[UnreachableV6] "UnreachableV6",
[PacketTooBigV6] "PacketTooBigV6",
[TimeExceedV6] "TimeExceedV6",
[Redirect] "Redirect",
[EchoRequest] "EchoRequest",
[TimeExceed] "TimeExceed",
[InParmProblem] "InParmProblem",
[Timestamp] "Timestamp",
[TimestampReply] "TimestampReply",
[InfoRequest] "InfoRequest",
[InfoReply] "InfoReply",
[AddrMaskRequest] "AddrMaskRequest",
[AddrMaskReply] "AddrMaskReply",
[EchoRequestV6] "EchoRequestV6",
[EchoReplyV6] "EchoReplyV6",
[RouterSolicit] "RouterSolicit",
[RouterAdvert] "RouterAdvert",
[NbrSolicit] "NbrSolicit",
[NbrAdvert] "NbrAdvert",
[RedirectV6] "RedirectV6",
};
static char *unreachcode[] =
{
[0] "no route to destination",
[1] "comm with destination administratively prohibited",
[2] "icmp unreachable: unassigned error code (2)",
[3] "address unreachable",
[4] "port unreachable",
[5] "icmp unreachable: unknown code",
};
static char *timexcode[] =
{
[0] "hop limit exc",
[1] "reassmbl time exc",
[2] "icmp time exc: unknown code",
};
static char *parpcode[] =
{
[0] "erroneous header field encountered",
[1] "unrecognized Next Header type encountered",
[2] "unrecognized IPv6 option encountered",
[3] "icmp par prob: unknown code",
};
enum
{
sll = 1,
tll = 2,
pref = 3,
redir = 4,
mtu = 5,
};
static char *icmp6opts[256] =
{
[0] "unknown opt",
[1] "sll_addr",
[2] "tll_addr",
[3] "pref_opt",
[4] "redirect",
[5] "mtu_opt",
};
static void
p_compile(Filter *f)
{
if(f->op == '='){
compile_cmp(icmp6.name, f, p_fields);
return;
}
if(strcmp(f->s, "ip6") == 0){
f->pr = p_mux->pr;
f->subop = Op;
return;
}
sysfatal("unknown icmp field or protocol: %s", f->s);
}
static int
p_filter(Filter *f, Msg *m)
{
Hdr *h;
if(m->pe - m->ps < ICMP6LEN)
return 0;
h = (Hdr*)m->ps;
m->ps += ICMP6LEN;
switch(f->subop){
case Ot:
if(h->type == f->ulv)
return 1;
break;
case Op:
switch(h->type){
case UnreachableV6:
case RedirectV6:
case TimeExceedV6:
m->ps += 4;
return 1;
}
}
return 0;
}
static char*
opt_seprint(Msg *m)
{
int otype, osz, pktsz;
uchar *a;
char *p = m->p;
char *e = m->e;
char *opt;
char optbuf[12];
pktsz = m->pe - m->ps;
a = m->ps;
while (pktsz > 0) {
otype = *a;
opt = icmp6opts[otype];
if(opt == nil){
sprint(optbuf, "0x%ux", otype);
opt = optbuf;
}
osz = (*(a+1)) * 8;
switch (otype) {
default:
p = seprint(p, e, "\n option=%s ", opt);
m->pr = &dump;
return p;
case sll:
case tll:
if (pktsz < osz || osz != 8) {
p = seprint(p, e, "\n option=%s bad size=%d",
opt, osz);
m->pr = &dump;
return p;
}
p = seprint(p, e, "\n option=%s maddr=%E", opt, a+2);
pktsz -= osz;
a += osz;
break;
case pref:
if ((pktsz < osz) || (osz != 32)) {
p = seprint(p, e, "\n option=%s: bad size=%d",
opt, osz);
m->pr = &dump;
return p;
}
p = seprint(p, e, "\n option=%s pref=%I "
"preflen=%3.3d lflag=%1.1d aflag=%1.1d "
"unused1=%1.1d validlt=%d preflt=%d unused2=%1.1d",
opt,
a+16,
(int) (*(a+2)),
(*(a+3) & (1 << 7)) != 0,
(*(a+3) & (1 << 6)) != 0,
(*(a+3) & 63) != 0,
NetL(a+4),
NetL(a+8),
NetL(a+12)!=0);
pktsz -= osz;
a += osz;
break;
case redir:
if (pktsz < osz) {
p = seprint(p, e, "\n option=%s: bad size=%d",
opt, osz);
m->pr = &dump;
return p;
}
p = seprint(p, e, "\n option=%s len %d", opt, osz);
a += osz;
m->ps = a;
return p;
case mtu:
if (pktsz < osz || osz != 8) {
p = seprint(p, e, "\n option=%s: bad size=%d",
opt, osz);
m->pr = &dump;
return p;
}
p = seprint(p, e, "\n option=%s unused=%1.1d mtu=%d",
opt, NetL(a+2) != 0, NetL(a+4));
pktsz -= osz;
a += osz;
break;
}
}
m->ps = a;
return p;
}
static int
p_seprint(Msg *m)
{
int i;
// ushort cksum2, cksum;
char *tn;
char *p = m->p;
char *e = m->e;
uchar *a;
Hdr *h;
h = (Hdr*)m->ps;
m->ps += ICMP6LEN;
m->pr = &dump;
a = m->ps;
if(m->pe - m->ps < ICMP6LEN)
return -1;
tn = icmpmsg6[h->type];
if(tn == nil)
p = seprint(p, e, "t=%ud c=%d ck=%4.4ux", h->type,
h->code, (ushort)NetS(h->cksum));
else
p = seprint(p, e, "t=%s c=%d ck=%4.4ux", tn,
h->code, (ushort)NetS(h->cksum));
/*
if(Cflag){
cksum = NetS(h->cksum);
h->cksum[0] = 0;
h->cksum[1] = 0;
cksum2 = ~ptclbsum((uchar*)h, m->pe - m->ps + ICMP6LEN) & 0xffff;
if(cksum != cksum2)
p = seprint(p,e, " !ck=%4.4ux", cksum2);
}
*/
switch(h->type){
case UnreachableV6:
m->ps += 4;
m->pr = &ip6;
if (h->code >= nelem(unreachcode))
i = nelem(unreachcode)-1;
else
i = h->code;
p = seprint(p, e, " code=%s unused=%1.1d ", unreachcode[i],
NetL(a) != 0);
break;
case PacketTooBigV6:
m->ps += 4;
m->pr = &ip6;
p = seprint(p, e, " mtu=%4.4d ", NetL(a));
break;
case TimeExceedV6:
m->ps += 4;
m->pr = &ip6;
if (h->code >= nelem(timexcode))
i = nelem(timexcode)-1;
else
i = h->code;
p = seprint(p, e, " code=%s unused=%1.1d ", timexcode[i],
NetL(a) != 0);
break;
case ParamProblemV6:
m->ps += 4;
m->pr = &ip6;
if (h->code > nelem(parpcode))
i = nelem(parpcode)-1;
else
i = h->code;
p = seprint(p, e, " code=%s ptr=%2.2ux", parpcode[i], h->data[0]);
break;
case EchoReplyV6:
case EchoRequestV6:
m->ps += 4;
p = seprint(p, e, " id=%ux seq=%ux",
NetS(h->data), NetS(h->data+2));
break;
case RouterSolicit:
m->ps += 4;
m->pr = nil;
m->p = seprint(p, e, " unused=%1.1d ", NetL(a)!=0);
p = opt_seprint(m);
break;
case RouterAdvert:
m->ps += 12;
m->pr = nil;
m->p = seprint(p, e, " hoplim=%3.3d mflag=%1.1d oflag=%1.1d "
"unused=%1.1d routerlt=%8.8d reachtime=%d rxmtimer=%d",
(int) *a,
(*(a+1) & (1 << 7)) != 0,
(*(a+1) & (1 << 6)) != 0,
(*(a+1) & 63) != 0,
NetS(a+2),
NetL(a+4),
NetL(a+8));
p = opt_seprint(m);
break;
case NbrSolicit:
m->ps += 20;
m->pr = nil;
m->p = seprint(p, e, " unused=%1.1d targ %I", NetL(a) != 0, a+4);
p = opt_seprint(m);
break;
case NbrAdvert:
m->ps += 20;
m->pr = nil;
m->p = seprint(p, e, " rflag=%1.1d sflag=%1.1d oflag=%1.1d targ=%I",
(*a & (1 << 7)) != 0,
(*a & (1 << 6)) != 0,
(*a & (1 << 5)) != 0,
a+4);
p = opt_seprint(m);
break;
case RedirectV6:
m->ps += 36;
m->pr = &ip6;
m->p = seprint(p, e, " unused=%1.1d targ=%I dest=%I",
NetL(a) != 0, a+4, a+20);
p = opt_seprint(m);
break;
case Timestamp:
case TimestampReply:
m->ps += 12;
p = seprint(p, e, " orig=%ud rcv=%ux xmt=%ux",
NetL(h->data), NetL(h->data+4), NetL(h->data+8));
m->pr = nil;
break;
case InfoRequest:
case InfoReply:
break;
}
m->p = p;
return 0;
}
Proto icmp6 =
{
"icmp6",
p_compile,
p_filter,
p_seprint,
p_mux,
"%lud",
p_fields,
defaultframer,
};