keysock.c

来自「eCos操作系统源码」· C语言 代码 · 共 753 行 · 第 1/2 页

			}
			n->m_len = MCLBYTES;
		}

		if (tlen < n->m_len)
			n->m_len = tlen;
		n->m_next = NULL;
		if (m == NULL)
			m = mprev = n;
		else {
			mprev->m_next = n;
			mprev = n;
		}
		tlen -= n->m_len;
		n = NULL;
	}
	m->m_pkthdr.len = len;
	m->m_pkthdr.rcvif = NULL;
	m_copyback(m, 0, len, (caddr_t)msg);

	/* avoid duplicated statistics */
	pfkeystat.in_total--;
	pfkeystat.in_bytes -= len;
	pfkeystat.in_msgtype[msg->sadb_msg_type]--;

	return key_sendup_mbuf(so, m, target);
}

/* so can be NULL if target != KEY_SENDUP_ONE */
int
key_sendup_mbuf(so, m, target)
	struct socket *so;
	struct mbuf *m;
	int target;
{
	struct mbuf *n;
	struct keycb *kp;
	int sendup;
	struct rawcb *rp;
	int error = 0;

	if (m == NULL)
		panic("key_sendup_mbuf: NULL pointer was passed.\n");
	if (so == NULL && target == KEY_SENDUP_ONE)
		panic("key_sendup_mbuf: NULL pointer was passed.\n");

	pfkeystat.in_total++;
	pfkeystat.in_bytes += m->m_pkthdr.len;
	if (m->m_len < sizeof(struct sadb_msg)) {
#if 1
		m = m_pullup(m, sizeof(struct sadb_msg));
		if (m == NULL) {
			pfkeystat.in_nomem++;
			return ENOBUFS;
		}
#else
		/* don't bother pulling it up just for stats */
#endif
	}
	if (m->m_len >= sizeof(struct sadb_msg)) {
		struct sadb_msg *msg;
		msg = mtod(m, struct sadb_msg *);
		pfkeystat.in_msgtype[msg->sadb_msg_type]++;
	}

#ifdef __NetBSD__
	for (rp = rawcb.lh_first; rp; rp = rp->rcb_list.le_next)
#elif defined(__FreeBSD__) && __FreeBSD__ >= 3
	LIST_FOREACH(rp, &rawcb_list, list)
#else
	for (rp = rawcb.rcb_next; rp != &rawcb; rp = rp->rcb_next)
#endif
	{
		if (rp->rcb_proto.sp_family != PF_KEY)
			continue;
		if (rp->rcb_proto.sp_protocol
		 && rp->rcb_proto.sp_protocol != PF_KEY_V2) {
			continue;
		}

		kp = (struct keycb *)rp;

		/*
		 * If you are in promiscuous mode, and when you get broadcasted
		 * reply, you'll get two PF_KEY messages.
		 * (based on [e-mail] message on 14 Oct 1998)
		 */
		if (((struct keycb *)rp)->kp_promisc) {
			if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
				(void)key_sendup0(rp, n, 1);
				n = NULL;
			}
		}

		/* the exact target will be processed later */
		if (so && sotorawcb(so) == rp)
			continue;

		sendup = 0;
		switch (target) {
		case KEY_SENDUP_ONE:
			/* the statement has no effect */
			if (so && sotorawcb(so) == rp)
				sendup++;
			break;
		case KEY_SENDUP_ALL:
			sendup++;
			break;
		case KEY_SENDUP_REGISTERED:
			if (kp->kp_registered)
				sendup++;
			break;
		}
		pfkeystat.in_msgtarget[target]++;

		if (!sendup)
			continue;

		if ((n = m_copy(m, 0, (int)M_COPYALL)) == NULL) {
			m_freem(m);
			pfkeystat.in_nomem++;
			return ENOBUFS;
		}

		if ((error = key_sendup0(rp, n, 0)) != 0) {
			m_freem(m);
			return error;
		}

		n = NULL;
	}

	if (so) {
		error = key_sendup0(sotorawcb(so), m, 0);
		m = NULL;
	} else {
		error = 0;
		m_freem(m);
	}
	return error;
}

#if defined(__FreeBSD__) && __FreeBSD__ >= 3
/*
 * key_abort()
 * derived from net/rtsock.c:rts_abort()
 */
static int
key_abort(struct socket *so)
{
	int s, error;
	s = splnet();
	error = raw_usrreqs.pru_abort(so);
	splx(s);
	return error;
}

/*
 * key_attach()
 * derived from net/rtsock.c:rts_attach()
 */
static int
key_attach(struct socket *so, int proto, struct proc *p)
{
	struct keycb *kp;
	int s, error;

	if (sotorawcb(so) != 0)
		return EISCONN;	/* XXX panic? */
	kp = (struct keycb *)malloc(sizeof *kp, M_PCB, M_WAITOK); /* XXX */
	if (kp == 0)
		return ENOBUFS;
	bzero(kp, sizeof *kp);

	/*
	 * The splnet() is necessary to block protocols from sending
	 * error notifications (like RTM_REDIRECT or RTM_LOSING) while
	 * this PCB is extant but incompletely initialized.
	 * Probably we should try to do more of this work beforehand and
	 * eliminate the spl.
	 */
	s = splnet();
	so->so_pcb = (caddr_t)kp;
	error = raw_usrreqs.pru_attach(so, proto, p);
	kp = (struct keycb *)sotorawcb(so);
	if (error) {
		free(kp, M_PCB);
		so->so_pcb = (caddr_t) 0;
		splx(s);
		return error;
	}

	kp->kp_promisc = kp->kp_registered = 0;

	if (kp->kp_raw.rcb_proto.sp_protocol == PF_KEY) /* XXX: AF_KEY */
		key_cb.key_count++;
	key_cb.any_count++;
	kp->kp_raw.rcb_laddr = &key_src;
	kp->kp_raw.rcb_faddr = &key_dst;
	soisconnected(so);
	so->so_options |= SO_USELOOPBACK;

	splx(s);
	return 0;
}

/*
 * key_bind()
 * derived from net/rtsock.c:rts_bind()
 */
static int
key_bind(struct socket *so, struct sockaddr *nam, struct proc *p)
{
	int s, error;
	s = splnet();
	error = raw_usrreqs.pru_bind(so, nam, p); /* xxx just EINVAL */
	splx(s);
	return error;
}

/*
 * key_connect()
 * derived from net/rtsock.c:rts_connect()
 */
static int
key_connect(struct socket *so, struct sockaddr *nam, struct proc *p)
{
	int s, error;
	s = splnet();
	error = raw_usrreqs.pru_connect(so, nam, p); /* XXX just EINVAL */
	splx(s);
	return error;
}

/*
 * key_detach()
 * derived from net/rtsock.c:rts_detach()
 */
static int
key_detach(struct socket *so)
{
	struct keycb *kp = (struct keycb *)sotorawcb(so);
	int s, error;

	s = splnet();
	if (kp != 0) {
		if (kp->kp_raw.rcb_proto.sp_protocol
		    == PF_KEY) /* XXX: AF_KEY */
			key_cb.key_count--;
		key_cb.any_count--;

		key_freereg(so);
	}
	error = raw_usrreqs.pru_detach(so);
	splx(s);
	return error;
}

/*
 * key_disconnect()
 * derived from net/rtsock.c:key_disconnect()
 */
static int
key_disconnect(struct socket *so)
{
	int s, error;
	s = splnet();
	error = raw_usrreqs.pru_disconnect(so);
	splx(s);
	return error;
}

/*
 * key_peeraddr()
 * derived from net/rtsock.c:rts_peeraddr()
 */
static int
key_peeraddr(struct socket *so, struct sockaddr **nam)
{
	int s, error;
	s = splnet();
	error = raw_usrreqs.pru_peeraddr(so, nam);
	splx(s);
	return error;
}

/*
 * key_send()
 * derived from net/rtsock.c:rts_send()
 */
static int
key_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
	 struct mbuf *control, struct proc *p)
{
	int s, error;
	s = splnet();
	error = raw_usrreqs.pru_send(so, flags, m, nam, control, p);
	splx(s);
	return error;
}

/*
 * key_shutdown()
 * derived from net/rtsock.c:rts_shutdown()
 */
static int
key_shutdown(struct socket *so)
{
	int s, error;
	s = splnet();
	error = raw_usrreqs.pru_shutdown(so);
	splx(s);
	return error;
}

/*
 * key_sockaddr()
 * derived from net/rtsock.c:rts_sockaddr()
 */
static int
key_sockaddr(struct socket *so, struct sockaddr **nam)
{
	int s, error;
	s = splnet();
	error = raw_usrreqs.pru_sockaddr(so, nam);
	splx(s);
	return error;
}

struct pr_usrreqs key_usrreqs = {
	key_abort, pru_accept_notsupp, key_attach, key_bind,
	key_connect,
	pru_connect2_notsupp, pru_control_notsupp, key_detach,
	key_disconnect, pru_listen_notsupp, key_peeraddr,
	pru_rcvd_notsupp,
	pru_rcvoob_notsupp, key_send, pru_sense_null, key_shutdown,
	key_sockaddr, sosend, soreceive, sopoll
};
#endif /* __FreeBSD__ >= 3 */

#ifdef __FreeBSD__
/* sysctl */
SYSCTL_NODE(_net, PF_KEY, key, CTLFLAG_RW, 0, "Key Family");
#endif

/*
 * Definitions of protocols supported in the KEY domain.
 */

extern struct domain keydomain;

struct protosw keysw[] = {
{ SOCK_RAW,	&keydomain,	PF_KEY_V2,	PR_ATOMIC|PR_ADDR,
  0,		key_output,	raw_ctlinput,	0,
#if defined(__FreeBSD__) && __FreeBSD__ >= 3
  0,
#else
  key_usrreq,
#endif
  raw_init,	0,		0,		0,
#if defined(__bsdi__) || defined(__NetBSD__)
  key_sysctl,
#elif defined(__FreeBSD__) && __FreeBSD__ >= 3
  &key_usrreqs
#endif
}
};

struct domain keydomain =
    { PF_KEY, "key", key_init, 0, 0,
      keysw, &keysw[sizeof(keysw)/sizeof(keysw[0])] };

#ifdef __FreeBSD__
DOMAIN_SET(key);
#endif