#include <u.h>#include <libc.h>#include <ip.h>#include "dat.h"#include "protos.h" typedef struct Hdr	Hdr;struct Hdr {	uchar	d[6];	uchar	s[6];	uchar	type[2];	char	data[1500];}; #define	ETHERMINTU	60	/* minimum transmit size */#define	ETHERMAXTU	1514	/* maximum transmit size */#define ETHERHDRSIZE	14	/* size of an ethernet header */ static Mux p_mux[] ={	{"ip",		0x0800,	} ,	{"arp",		0x0806,	} ,	{"rarp",	0x0806,	} ,	{"ip6", 	0x86dd, } ,	{"pppoe_disc",	0x8863, },	{"pppoe_sess",	0x8864, },	{"eapol",	0x888e, },	{"aoe",		0x88a2, } ,	{"cec",		0xbcbc, } ,	{0}}; enum{	Os,	/* source */	Od,	/* destination */	Oa,	/* source or destination */	Ot,	/* type */	Ol,	/* len */}; static Field p_fields[] ={	{"s",	Fether,	Os,	"source address",	} ,	{"d",	Fether,	Od,	"destination address",	} ,	{"a",	Fether,	Oa,	"source|destination address" } ,	{"sd",	Fether,	Oa,	"source|destination address" } ,	{"t",	Fnum,	Ot,	"type" } ,	{"ln",	Fnum,	Ol,	"length"} ,	{0}}; static voidp_compile(Filter *f){	Mux *m; 	if(f->op == '='){		compile_cmp(ether.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 ethernet field or protocol: %s", f->s);} static intp_filter(Filter *f, Msg *m){	int len;	Hdr *h; 	len = m->pe - m->ps;	if(len < ETHERHDRSIZE)		return 0; 	h = (Hdr*)m->ps;	m->ps += ETHERHDRSIZE; 	switch(f->subop){	case Os:		return memcmp(h->s, f->a, 6) == 0;	case Od:		return memcmp(h->d, f->a, 6) == 0;	case Oa:		return memcmp(h->s, f->a, 6) == 0 || memcmp(h->d, f->a, 6) == 0;	case Ot:		return NetS(h->type) == f->ulv;	case Ol:		return len == f->ulv;	}	return 0;} static intp_seprint(Msg *m){	int len;	uint t;	Hdr *h; 	len = m->pe - m->ps;	if(len < ETHERHDRSIZE)		return -1; 	h = (Hdr*)m->ps;	m->ps += ETHERHDRSIZE; 	t = NetS(h->type);	demux(p_mux, t, t, m, &dump); 	m->p = seprint(m->p, m->e, "s=%E d=%E pr=%4.4ux ln=%d", h->s, h->d,		t, len);	return 0;} Proto ether ={	"ether",	p_compile,	p_filter,	p_seprint,	p_mux,	"%#.4lux",	p_fields,	defaultframer};