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#include <u.h>
#include <libc.h>
#include <ip.h>
#include "dat.h"
#include "protos.h"
typedef struct Hdr Hdr;
struct Hdr {
uchar ia[16];
uchar data[1];
};
static Mux p_mux[] =
{
{"ip", 0x40, },
{"ip6", 0x60, },
{0}
};
enum
{
Oia, /* interface address */
Ot, /* ip type */
};
static Field p_fields[] =
{
{"ia", Fv6ip, Oia, "interface address", },
{"t", Fnum, Ot, "ip type" },
{0}
};
static void
p_compile(Filter *f)
{
Mux *m;
if(f->op == '='){
compile_cmp(ipmux.name, f, p_fields);
return;
}
for(m = p_mux; m->name != nil; m++)
if(strcmp(f->s, m->name) == 0){
f->pr = m->pr;
f->ulv = m->val;
f->subop = Ot;
return;
}
sysfatal("unknown ipmux field or protocol: %s", f->s);
}
static int
p_filter(Filter *f, Msg *m)
{
Hdr *h;
if(m->pe - m->ps <= 16)
return 0;
h = (Hdr*)m->ps;
m->ps += 16;
switch(f->subop){
case Oia:
return memcmp(h->ia, f->a, 16) == 0;
case Ot:
return (h->data[0]&0xF0) == f->ulv;
}
return 0;
}
static int
p_seprint(Msg *m)
{
int len;
uint t;
Hdr *h;
len = m->pe - m->ps;
if(len <= 16)
return -1;
h = (Hdr*)m->ps;
m->ps += 16;
t = h->data[0]&0xF0;
demux(p_mux, t, t, m, &dump);
m->p = seprint(m->p, m->e, "ia=%I t=%2.2ux ln=%d", h->ia, t, len);
return 0;
}
Proto ipmux =
{
"ipmux",
p_compile,
p_filter,
p_seprint,
p_mux,
"%#.2lux",
p_fields,
defaultframer
};
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