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#include <u.h>
#include <libc.h>
#include <ip.h>
#include "dat.h"
#include "protos.h"
extern Mux ethertypes[];
typedef struct Hdr Hdr;
struct Hdr {
uchar tag[2];
uchar type[2];
};
enum
{
Ov, /* vlan */
Oq, /* qprio */
Ot, /* type */
};
static Field p_fields[] =
{
{"v", Fnum, Ov, "vlan id" } ,
{"q", Fnum, Oq, "queue prio" } ,
{"t", Fnum, Ot, "type" } ,
{0}
};
static void
p_compile(Filter *f)
{
Mux *m;
if(f->op == '='){
compile_cmp(vlan.name, f, p_fields);
return;
}
for(m = ethertypes; 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 vlan field or protocol: %s", f->s);
}
static int
p_filter(Filter *f, Msg *m)
{
Hdr *h;
if(m->pe - m->ps < 4)
return 0;
h = (Hdr*)m->ps;
m->ps += 4;
switch(f->subop){
case Ov:
return (NetS(h->tag) & 0xFFF) == f->ulv;
case Oq:
return (NetS(h->tag) >> 12) == f->ulv;
case Ot:
return NetS(h->type) == f->ulv;
}
return 0;
}
static int
p_seprint(Msg *m)
{
uint v, q, t;
int len;
Hdr *h;
len = m->pe - m->ps;
if(len < 4)
return -1;
h = (Hdr*)m->ps;
m->ps += 4;
q = NetS(h->tag) >> 12;
v = NetS(h->tag) & 0xFFF;
t = NetS(h->type);
demux(ethertypes, t, t, m, &dump);
m->p = seprint(m->p, m->e, "v=%ud q=%ux pr=%4.4ux ln=%d", v, q, t, len);
return 0;
}
Proto vlan =
{
"vlan",
p_compile,
p_filter,
p_seprint,
ethertypes,
"%#.4lux",
p_fields,
defaultframer
};
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