#include <u.h>#include <libc.h>#include <ip.h>#include "dat.h"#include "protos.h" typedef struct{	uchar	spi[4];	uchar	seq[4];}Hdr; enum{	Hsize	= 8,}; enum{	Ospi,	Oseq,}; static Field p_fields[] ={	{"spi",	Fnum,	Ospi,		"spi",	},	{"seq",	Fnum,	Oseq,		"seq",	},	{0}}; static voidp_compile(Filter *f){	if(f->op == '='){		compile_cmp(esp.name, f, p_fields);		return;	}	sysfatal("unknown esp field: %s", f->s);} static intp_filter(Filter *f, Msg *m){	Hdr *h; 	if(m->pe - m->ps < Hsize)		return 0; 	h = (Hdr*)m->ps;	m->ps += Hsize; 	switch(f->subop){	case Ospi:		return NetL(h->spi) == f->ulv;	case Oseq:		return NetL(h->seq) == f->ulv;	}	return 0;} static intp_seprint(Msg *m){	Hdr *h; 	if(m->pe - m->ps < Hsize)		return 0; 	h = (Hdr*)m->ps;	m->ps += Hsize; 	/* no next protocol */	m->pr = nil; 	m->p = seprint(m->p, m->e, "spi=%.8ux seq=%.8ux",		NetL(h->spi), NetL(h->seq));	return 0;} Proto esp ={	"esp",	p_compile,	p_filter,	p_seprint,	nil,	nil,	p_fields,	defaultframer,};