[unix-history] / usr / src / sys / netccitt / if_x25subr.c

/*
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * %sccs.include.redist.c%
 *
 *	@(#)if_x25subr.c	7.2 (Berkeley) %G%
 */

#include "param.h"
#include "systm.h"
#include "malloc.h"
#include "mbuf.h"
#include "protosw.h"
#include "socket.h"
#include "ioctl.h"
#include "errno.h"
#include "syslog.h"

#include "if.h"
#include "netisr.h"
#include "route.h"

#include "x25_var.h"
#include "x25_pk.h"
#include "machine/mtpr.h"

#ifdef INET
#include "../netinet/in.h"
#include "../netinet/in_var.h"
#endif

#ifdef NS
#include "../netns/ns.h"
#include "../netns/ns_if.h"
#endif

#ifdef ISO
#include "../netiso/argo_debug.h"
#include "../netiso/iso.h"
#include "../netiso/iso_var.h"
#endif

extern	struct ifnet loif;

#define senderr(x) {error = x; goto bad;}
/*
 * X.25 output routine.
 */
x25_ifoutput(xc, m0, dst, rt)
struct	x25com *xc;
struct	mbuf *m0;
struct	sockaddr *dst;
register struct	rtentry *rt;
{
	register struct mbuf *m = m0;
	register struct x25lcb *xl;
	register struct xq *oq;
	register struct x25lcb **xlp;
	struct mbuf    *prev;
	int             s, error = 0, flags = 0;
	union imp_addr  imp_addr;
	int flags = 0;

	if ((xc->xc_if.if_flags & IFF_UP) == 0)
		return (ENETDOWN);
	if (rt == 0 ||
	    ((rt->rt_flags & RTF_GATEWAY) && (dst = rt->rt_gateway))) {
		if ((rt = rtalloc1(dst, 1)) == 0)
			return (EHOSTUNREACH);
		rt->rt_refcnt++;
		flags = XL_RTHELD;
	}
	/*
	 * Sanity checks.
	 */
	if ((rt->rt_ifp != (struct ifnet *)xc) ||
	    (rt->rt_flags & (RTF_CLONING | RTF_GATEWAY)) ||
	    ((xl = (struct x25lcb *)rt->rt_llinfo) == 0)) {
		printf("Inconsistent call to x25_output, should panic\n");
		senderr(ENETUNREACH);
	}
	xq = &xl->xl_downq;
	switch (xl->xl_state) {

	case XLS_CONNECTED:
		xl->xl_timer = xc->xc_dg_idletimo;
		/* FALLTHROUGH */
	case XLS_CONNECTING:
		if (xq->xq_space < 0)
			senderr(ENOBUFS);
		xq->xq_put(xq, m);
		break;

	case XLS_NEWBORN:
		xq = &xl->xl_upq;
		xq->xq_next = (caddr_t)rt;
		xq->xq_put = x25_ifinput;
		if (dst->sa_family == AF_INET &&
		    xc->xc_if.if_type == IFT_DDN &&
		    rt->rt_gateway->sa_family != AF_CCITT)
			x25_ddnip_to_ccitt(dst, rt->rt_gateway);
		xl->xl_xc = xc;
		xq = &xl->xl_downq;
		xq->xq_space = 2048;  /* XXX: bogus xq before if_start called */
		xl->xl_flags |= XL_DGRAM;
		xl->xl_state = XLS_FREE;
		if (rt->rt_gateway->sa_family != AF_CCITT) {
			/*
			 * Need external resolution of dst
			 */
			if ((rt->rt_flags & RTF_XRESOLVE) == 0)
				senderr(ENETUNREACH);
			xl->xl_flags |= flags;
			xl->xl_timer = xc->xc_rslvtimo;
			flags = 0;
			rt_missmsg(RTM_RESOLVE, dst,
			    (struct sockaddr *)0, (struct sockaddr *)0,
			    (struct sockaddr *)0, 0, 0);
			xl->xl_state = XLS_RESOLVING;
			/* FALLTHROUGH */
	case XLS_RESOLVING:
			if (xq->xq_space < 0)
				senderr(ENOBUFS);
			xq->xq_space -= m->m_pkthdr.len;
			if (xq->xq_data == 0)
				xq->xq_data = m;
			else {
				for (m = xq->xq_data; m->m_nextpkt; )
					m = m->m_nextpkt;
				m->m_nextpkt = m0;
			}
			break;
		}
		/* FALLTHROUGH */
	case XLS_FREE:
		xlp = xc->xc_lcbvec + xc->xc_nchan;
		s = splimp(); /* need to block out incoming requests */
		if (xc->xc_nactive < xc->xc_nchan) {
			while (--xlp > xc->xc_lcbvec && *xlp)
				;
			if (xlp > xc->xc_lcbvec) {
				xc->xc_nactive++;
				*xlp = xl;
				xl->xl_index = xlp - xc->xc_lcbvec;
				x25_ifstart(xl, m, rt->rt_gateway, dst);
				splx(s);
				break;
			}
		}
		splx(s);
		/* FALLTHROUGH */
	default:
		/*
		 * We count on the timer routine to close idle
		 * connections, if there are not enough circuits to go
		 * around.
		 *
		 * So throw away data for now.
		 * After we get it all working, we'll rewrite to handle
		 * actively closing connections (other than by timers),
		 * when circuits get tight.
		 *
		 * In the DDN case, the imp itself closes connections
		 * under heavy load.
		 */
		error = ENOBUFS;
	bad:
		if (m)
			m_freem(m);
	}
out:
	if (flags & XL_RTHELD)
		RTFREE(rt);
	return (error);
}

/*
 * Simpleminded timer for very smart devices.
 */
x25_iftimeout(xc)
register struct x25com *xc;
{
	register struct x25lcb **xlp = xc->xc_lcbvec + xc->xc_nchan;
	register struct x25lcb *xl;
	int s = splimp();

	if (xc->xc_disconnect)
	    while (--xlp > xc->xc_lcbvec)
		if ((xl = *xlp) && xl->xl_state == XLS_CONECTED &&
		    (xl->xl_flags & XL_DGRAM) && --(xl->xl_timer) <= 0)
			xc->xc_disconnect(xl);
	splx(s);
}

/*
 * Process a x25 packet as datagram;
 */
x25_ifinput(xq, m)
struct xq *xq;
struct mbuf *m;
{
	struct rtentry *rt = (struct rtentry *)xq->xq_next;
	struct x25lcb *xl = (struct x25lcb *)rt->rt_llinfo;
	register struct ifnet *ifp = &xl->xl_xc.xc_if;
	register struct llc *l;
	int s;

	ifp->if_lastchange = time;

	switch (rt_dst(rt)->sa_family) {
#ifdef INET
	case AF_INET:
		schednetisr(NETISR_IP);
		inq = &ipintrq;
		break;

#endif
#ifdef NS
	case AF_NS:
		schednetisr(NETISR_NS);
		inq = &nsintrq;
		break;

#endif
#ifdef	ISO
	case AF_ISO:
		/* XXXX need to find out about tearing off COSNS
		   headers if any */
		schednetisr(NETISR_ISO);
		inq = &clnlintrq;
		break;
#endif
	default:
		m_freem(m);
		ifp->if_noproto++;
		return;
	}
	s = splimp();
	if (IF_QFULL(inq)) {
		IF_DROP(inq);
		m_freem(m);
	} else {
		IF_ENQUEUE(inq, m);
		ifp->if_ibytes += m->m_pkthdr.len;
	}
	splx(s);
}

union imp_addr {
	struct in_addr  ip;
	struct imp {
		u_char		s_net;
		u_char		s_host;
		u_char		s_lh;
		u_char		s_impno;
	}		    imp;
};
static struct sockaddr_x25 blank_x25 = {sizeof blank_x25, AF_CCITT};
/*
 * IP to X25 address routine copyright ACC, used by permission.
 */
x25_ddnip_to_ccitt(src, dst)
struct sockaddr_in *src;
register struct sockaddr_x25 *dst;
{
	union imp_addr imp_addr;
	int             imp_no, imp_port;
	char *x25addr = dst->x25_x25addr;


	imp_addr.ip = src->sin_addr.s_addr;
	*dst = blank_x25;
	if ((imp_addr.imp.s_net & 0x80) == 0x00) {	/* class A */
	    imp_no = imp_addr.imp.s_impno;
	    imp_port = imp_addr.imp.s_host;
	} else if ((imp_addr.imp.s_net & 0xc0) == 0x80) {	/* class B */
	    imp_no = imp_addr.imp.s_impno;
	    imp_port = imp_addr.imp.s_lh;
	} else {		/* class C */
	    imp_no = imp_addr.imp.s_impno / 32;
	    imp_port = imp_addr.imp.s_impno % 32;
	}

	x25addr[0] = 12; /* length */
	/* DNIC is cleared by struct copy above */

	if (imp_port < 64) {	/* Physical:  0000 0 IIIHH00 [SS] *//* s_impno
				 *  -> III, s_host -> HH */
	    x25addr[5] = 0;	/* set flag bit */
	    x25addr[6] = imp_no / 100;
	    x25addr[7] = (imp_no % 100) / 10;
	    x25addr[8] = imp_no % 10;
	    x25addr[9] = imp_port / 10;
	    x25addr[10] = imp_port % 10;
	} else {		/* Logical:   0000 1 RRRRR00 [SS]	 *//* s
				 * _host * 256 + s_impno -> RRRRR */
	    temp = (imp_port << 8) + imp_no;
	    x25addr[5] = 1;
	    x25addr[6] = temp / 10000;
	    x25addr[7] = (temp % 10000) / 1000;
	    x25addr[8] = (temp % 1000) / 100;
	    x25addr[9] = (temp % 100) / 10;
	    x25addr[10] = temp % 10;
	}
}

#ifdef caseof
#undef caseof
#endif
#define caseof(a, b) (b + 8 * a)
#define SA(p) ((struct sockaddr *)(p))

/*
 * This routine gets called when validing new routes or deletions of old
 * ones.
 */
x25_ifrtchange(cmd, rt, dst)
register struct rtentry *rt;
struct sockaddr *dst;
{
	register struct x25lcb *xl = (struct x25lcb *)rt->rt_llinfo;
	register struct x25com *xc;
	register struct sockaddr_x25 *sa =(struct sockaddr_x25 *)rt->rt_gateway;
	register struct sockaddr *sa2;
	struct mbuf *m, *mold;

	if (xl == 0)
		return;
	xc = xl->xl_xc;
	switch (caseof(xl->xl_state, cmd)) {
	case caseof(XLS_CONNECTED, RTM_DELETE):
	case caseof(XLS_CONNECTED, RTM_CHANGE):
	case caseof(XLS_CONNECTING, RTM_DELETE):
	case caseof(XLS_CONNECTING, RTM_CHANGE):
		xc->xc_disconnect(xl);
		break;

	case caseof(XLS_CONNECTED, RTM_ADD):
	case caseof(XLS_CONNECTING, RTM_ADD):
	case caseof(XLS_RESOLVING, RTM_ADD):
		printf("ifrtchange: impossible transition, should panic\n");
		break;

	case caseof(XLS_RESOLVING, RTM_DELETE):
		for (m = xl->xl_downq.xq_data; m;) {
			mold = m;
			m = m->m_nextpkt;
			m_freem(mold);
		}
		break;

	case caseof(XLS_RESOLVING, RTM_CHANGE):
		xc->xc_if.if_start(xl, 0, dst);
		break;
	}
	if (xc->xc_if.if_type == IFT_DDN)
		return;  /* reverse name table not necessary */
	sa2 = SA(rt->rt_key);
	if (cmd == RTM_CHANGE) {
		if (sa->sa_family == AF_CCITT) {
			sa->sa_rfamily = sa2->sa_family;
			(void) rtrequest(RTM_DELETE, SA(sa), sa2,
			       SA(0), RTF_HOST, (struct rtentry **)0);
		}
		sa = (struct sockaddr_x25 *)dst;
		cmd = RTM_ADD;
	}
	if (sa->sa_family == AF_CCITT) {
		sa->sa_rfamily = sa2->sa_family;
		(void) rtrequest(cmd, SA(sa), sa2, SA(0), RTF_HOST,
							(struct rtentry **)0);
		sa->sa_rfamily = 0;
	}
}
static struct sockaddr sin = {sizeof(sin), AF_INET};
/*
 * This is a utility routine to be called by x25 devices when a
 * call request is honored with the intent of starting datagram forwarding.
 */
x25_dg_rtinit(dst, xc, af)
struct sockaddr_x25 *dst;
register struct x25com *xc;
{
	struct sockaddr *sa = 0;
	if (xc->xc_if.if_type == IFT_DDN && af == AF_INET) {
	/*
	 * Inverse X25 to IPP mapping copyright and courtesy ACC.
	 */
		int             imp_no, imp_port, temp;
		union imp_addr imp_addr;
	    {
		/*
		 * First determine our IP addr for network
		 */
		register struct in_ifaddr *ia;
		extern struct in_ifaddr *in_ifaddr;
		for (ia = in_ifaddr; ia; ia = ia->ia_next)
			if (ia->ia_ifp == &xc->xc_if) {
				imp_addr.ip = ia->ia_addr.sin_addr;
				break;
			}
	    }
	    {

		register char *x25addr = dst->x25_addr;

		switch (x25addr[5] & 0x0f) {
		  case 0:	/* Physical:  0000 0 IIIHH00 [SS]	 */
		    imp_no =
			((int) (x25addr[6] & 0x0f) * 100) +
			((int) (x25addr[7] & 0x0f) * 10) +
			((int) (x25addr[8] & 0x0f));


		    imp_port =
			((int) (x25addr[9] & 0x0f) * 10) +
			((int) (x25addr[10] & 0x0f));
		    break;
		  case 1:	/* Logical:   0000 1 RRRRR00 [SS]	 */
		    temp = ((int) (x25addr[6] & 0x0f) * 10000)
			+ ((int) (x25addr[7] & 0x0f) * 1000)
			+ ((int) (x25addr[8] & 0x0f) * 100)
			+ ((int) (x25addr[9] & 0x0f) * 10)
			+ ((int) (x25addr[10] & 0x0f));

		    imp_port = temp >> 8;
		    imp_no = temp & 0xff;
		    break;
		  default:
		    return (0L);
		}
		imp_addr.ip.s_addr = my_addr;
		if ((imp_addr.imp.s_net & 0x80) == 0x00) {
		/* class A */
		    imp_addr.imp.s_host = imp_port;
		    imp_addr.imp.s_impno = imp_no;
		    imp_addr.imp.s_lh = 0;
		} else if ((imp_addr.imp.s_net & 0xc0) == 0x80) {
		/* class B */
		    imp_addr.imp.s_lh = imp_port;
		    imp_addr.imp.s_impno = imp_no;
		} else {
		/* class C */
		    imp_addr.imp.s_impno = (imp_no << 5) + imp_port;
		}
	    }
		sin.sin_addr = imp_addr.ip;
		sa = (struct sockaddr *)&sin;
	} else {
		/*
		 * This uses the X25 routing table to do inverse
		 * lookup of x25 address to sockaddr.
		 */
		dst->sa_rfamily = af;
		if (rt = rtalloc1(dst, 0)) {
			sa = rt->rt_gateway;
			rt->rt_refcnt--;
		}
		dst->sa_rfamily = 0;
	}
	/* 
	 * Call to rtalloc1 will create rtentry for reverse path
	 * to callee by virtue of cloning magic and will allocate
	 * space for local control block.
	 */
	if (sa && rt = rtalloc1(sa, 1))
		rt->rt_refcnt--;
}
Commit	Line	Data
16e7cbfd	1	/*
94b7ce3b	2	* Copyright (c) 1990 The Regents of the University of California.
16e7cbfd KS	3	* All rights reserved.
16e7cbfd KS	4	*
94b7ce3b	5	* %sccs.include.redist.c%
16e7cbfd	6	*
94b7ce3b	7	* @(#)if_x25subr.c 7.2 (Berkeley) %G%
16e7cbfd KS	8	*/
	9
	10	#include "param.h"
	11	#include "systm.h"
	12	#include "malloc.h"
	13	#include "mbuf.h"
	14	#include "protosw.h"
	15	#include "socket.h"
	16	#include "ioctl.h"
	17	#include "errno.h"
	18	#include "syslog.h"
	19
	20	#include "if.h"
	21	#include "netisr.h"
	22	#include "route.h"
	23
	24	#include "x25_var.h"
	25	#include "x25_pk.h"
	26	#include "machine/mtpr.h"
	27
	28	#ifdef INET
	29	#include "../netinet/in.h"
	30	#include "../netinet/in_var.h"
	31	#endif
	32
	33	#ifdef NS
	34	#include "../netns/ns.h"
	35	#include "../netns/ns_if.h"
	36	#endif
	37
	38	#ifdef ISO
	39	#include "../netiso/argo_debug.h"
	40	#include "../netiso/iso.h"
	41	#include "../netiso/iso_var.h"
	42	#endif
	43
	44	extern struct ifnet loif;
	45
	46	#define senderr(x) {error = x; goto bad;}
	47	/*
	48	* X.25 output routine.
	49	*/
	50	x25_ifoutput(xc, m0, dst, rt)
	51	struct x25com *xc;
	52	struct mbuf *m0;
	53	struct sockaddr *dst;
	54	register struct rtentry *rt;
	55	{
	56	register struct mbuf *m = m0;
	57	register struct x25lcb *xl;
	58	register struct xq *oq;
	59	register struct x25lcb **xlp;
	60	struct mbuf *prev;
	61	int s, error = 0, flags = 0;
	62	union imp_addr imp_addr;
	63	int flags = 0;
	64
	65	if ((xc->xc_if.if_flags & IFF_UP) == 0)
	66	return (ENETDOWN);
	67	if (rt == 0 \|\|
	68	((rt->rt_flags & RTF_GATEWAY) && (dst = rt->rt_gateway))) {
	69	if ((rt = rtalloc1(dst, 1)) == 0)
	70	return (EHOSTUNREACH);
	71	rt->rt_refcnt++;
72	flags = XL_RTHELD;
73	}
74	/*
75	* Sanity checks.
76	*/
77	if ((rt->rt_ifp != (struct ifnet *)xc) \|\|
78	(rt->rt_flags & (RTF_CLONING \| RTF_GATEWAY)) \|\|
79	((xl = (struct x25lcb *)rt->rt_llinfo) == 0)) {
80	printf("Inconsistent call to x25_output, should panic\n");
81	senderr(ENETUNREACH);
82	}
83	xq = &xl->xl_downq;
84	switch (xl->xl_state) {
85
86	case XLS_CONNECTED:
87	xl->xl_timer = xc->xc_dg_idletimo;
88	/* FALLTHROUGH */
89	case XLS_CONNECTING:
90	if (xq->xq_space < 0)
91	senderr(ENOBUFS);
92	xq->xq_put(xq, m);
93	break;
94
95	case XLS_NEWBORN:
96	xq = &xl->xl_upq;
97	xq->xq_next = (caddr_t)rt;
98	xq->xq_put = x25_ifinput;
99	if (dst->sa_family == AF_INET &&
100	xc->xc_if.if_type == IFT_DDN &&
101	rt->rt_gateway->sa_family != AF_CCITT)
102	x25_ddnip_to_ccitt(dst, rt->rt_gateway);
103	xl->xl_xc = xc;
104	xq = &xl->xl_downq;
105	xq->xq_space = 2048; /* XXX: bogus xq before if_start called */
106	xl->xl_flags \|= XL_DGRAM;
107	xl->xl_state = XLS_FREE;
108	if (rt->rt_gateway->sa_family != AF_CCITT) {
109	/*
110	* Need external resolution of dst
111	*/
112	if ((rt->rt_flags & RTF_XRESOLVE) == 0)
113	senderr(ENETUNREACH);
114	xl->xl_flags \|= flags;
115	xl->xl_timer = xc->xc_rslvtimo;
116	flags = 0;
117	rt_missmsg(RTM_RESOLVE, dst,
118	(struct sockaddr )0, (struct sockaddr )0,
119	(struct sockaddr *)0, 0, 0);
120	xl->xl_state = XLS_RESOLVING;
121	/* FALLTHROUGH */
122	case XLS_RESOLVING:
123	if (xq->xq_space < 0)
124	senderr(ENOBUFS);
125	xq->xq_space -= m->m_pkthdr.len;
126	if (xq->xq_data == 0)
127	xq->xq_data = m;
128	else {
129	for (m = xq->xq_data; m->m_nextpkt; )
130	m = m->m_nextpkt;
131	m->m_nextpkt = m0;
132	}
133	break;
134	}
135	/* FALLTHROUGH */
136	case XLS_FREE:
137	xlp = xc->xc_lcbvec + xc->xc_nchan;
138	s = splimp(); /* need to block out incoming requests */
139	if (xc->xc_nactive < xc->xc_nchan) {
140	while (--xlp > xc->xc_lcbvec && *xlp)
141	;
142	if (xlp > xc->xc_lcbvec) {
143	xc->xc_nactive++;
144	*xlp = xl;
145	xl->xl_index = xlp - xc->xc_lcbvec;
146	x25_ifstart(xl, m, rt->rt_gateway, dst);
147	splx(s);
148	break;
149	}
150	}
151	splx(s);
152	/* FALLTHROUGH */
153	default:
154	/*
155	* We count on the timer routine to close idle
156	* connections, if there are not enough circuits to go
157	* around.
158	*
159	* So throw away data for now.
160	* After we get it all working, we'll rewrite to handle
161	* actively closing connections (other than by timers),
162	* when circuits get tight.
163	*
164	* In the DDN case, the imp itself closes connections
165	* under heavy load.
166	*/
167	error = ENOBUFS;
168	bad:
169	if (m)
170	m_freem(m);
171	}
172	out:
173	if (flags & XL_RTHELD)
174	RTFREE(rt);
175	return (error);
176	}
177
178	/*
179	* Simpleminded timer for very smart devices.
180	*/
181	x25_iftimeout(xc)
182	register struct x25com *xc;
183	{
184	register struct x25lcb **xlp = xc->xc_lcbvec + xc->xc_nchan;
185	register struct x25lcb *xl;
186	int s = splimp();
187
188	if (xc->xc_disconnect)
189	while (--xlp > xc->xc_lcbvec)
190	if ((xl = *xlp) && xl->xl_state == XLS_CONECTED &&
191	(xl->xl_flags & XL_DGRAM) && --(xl->xl_timer) <= 0)
192	xc->xc_disconnect(xl);
193	splx(s);
194	}
195
196	/*
197	* Process a x25 packet as datagram;
198	*/
199	x25_ifinput(xq, m)
200	struct xq *xq;
201	struct mbuf *m;
202	{
203	struct rtentry rt = (struct rtentry )xq->xq_next;
204	struct x25lcb xl = (struct x25lcb )rt->rt_llinfo;
205	register struct ifnet *ifp = &xl->xl_xc.xc_if;
206	register struct llc *l;
207	int s;
208
209	ifp->if_lastchange = time;
210
211	switch (rt_dst(rt)->sa_family) {
212	#ifdef INET
213	case AF_INET:
214	schednetisr(NETISR_IP);
215	inq = &ipintrq;
216	break;
217
218	#endif
219	#ifdef NS
220	case AF_NS:
221	schednetisr(NETISR_NS);
222	inq = &nsintrq;
223	break;
224
225	#endif
226	#ifdef ISO
227	case AF_ISO:
228	/* XXXX need to find out about tearing off COSNS
229	headers if any */
230	schednetisr(NETISR_ISO);
231	inq = &clnlintrq;
232	break;
233	#endif
234	default:
235	m_freem(m);
236	ifp->if_noproto++;
237	return;
238	}
239	s = splimp();
240	if (IF_QFULL(inq)) {
241	IF_DROP(inq);
242	m_freem(m);
243	} else {
244	IF_ENQUEUE(inq, m);
245	ifp->if_ibytes += m->m_pkthdr.len;
246	}
247	splx(s);
248	}
249
250	union imp_addr {
251	struct in_addr ip;
252	struct imp {
253	u_char s_net;
254	u_char s_host;
255	u_char s_lh;
256	u_char s_impno;
257	} imp;
258	};
259	static struct sockaddr_x25 blank_x25 = {sizeof blank_x25, AF_CCITT};
260	/*
261	* IP to X25 address routine copyright ACC, used by permission.
262	*/
263	x25_ddnip_to_ccitt(src, dst)
264	struct sockaddr_in *src;
265	register struct sockaddr_x25 *dst;
266	{
267	union imp_addr imp_addr;
268	int imp_no, imp_port;
269	char *x25addr = dst->x25_x25addr;
270
271
272	imp_addr.ip = src->sin_addr.s_addr;
273	*dst = blank_x25;
274	if ((imp_addr.imp.s_net & 0x80) == 0x00) { /* class A */
275	imp_no = imp_addr.imp.s_impno;
276	imp_port = imp_addr.imp.s_host;
277	} else if ((imp_addr.imp.s_net & 0xc0) == 0x80) { /* class B */
278	imp_no = imp_addr.imp.s_impno;
279	imp_port = imp_addr.imp.s_lh;
280	} else { /* class C */
281	imp_no = imp_addr.imp.s_impno / 32;
282	imp_port = imp_addr.imp.s_impno % 32;
283	}
284
285	x25addr[0] = 12; /* length */
286	/* DNIC is cleared by struct copy above */
287
288	if (imp_port < 64) { /* Physical: 0000 0 IIIHH00 [SS] // s_impno
289	* -> III, s_host -> HH */
290	x25addr[5] = 0; /* set flag bit */
291	x25addr[6] = imp_no / 100;
292	x25addr[7] = (imp_no % 100) / 10;
293	x25addr[8] = imp_no % 10;
294	x25addr[9] = imp_port / 10;
295	x25addr[10] = imp_port % 10;
296	} else { /* Logical: 0000 1 RRRRR00 [SS] // s
297	* _host * 256 + s_impno -> RRRRR */
298	temp = (imp_port << 8) + imp_no;
299	x25addr[5] = 1;
300	x25addr[6] = temp / 10000;
301	x25addr[7] = (temp % 10000) / 1000;
302	x25addr[8] = (temp % 1000) / 100;
303	x25addr[9] = (temp % 100) / 10;
304	x25addr[10] = temp % 10;
305	}
306	}
307
308	#ifdef caseof
309	#undef caseof
310	#endif
311	#define caseof(a, b) (b + 8 * a)
312	#define SA(p) ((struct sockaddr *)(p))
313
314	/*
315	* This routine gets called when validing new routes or deletions of old
316	* ones.
317	*/
318	x25_ifrtchange(cmd, rt, dst)
319	register struct rtentry *rt;
320	struct sockaddr *dst;
321	{
322	register struct x25lcb xl = (struct x25lcb )rt->rt_llinfo;
323	register struct x25com *xc;
324	register struct sockaddr_x25 sa =(struct sockaddr_x25 )rt->rt_gateway;
325	register struct sockaddr *sa2;
326	struct mbuf m, mold;
327
328	if (xl == 0)
329	return;
330	xc = xl->xl_xc;
331	switch (caseof(xl->xl_state, cmd)) {
332	case caseof(XLS_CONNECTED, RTM_DELETE):
333	case caseof(XLS_CONNECTED, RTM_CHANGE):
334	case caseof(XLS_CONNECTING, RTM_DELETE):
335	case caseof(XLS_CONNECTING, RTM_CHANGE):
336	xc->xc_disconnect(xl);
337	break;
338
339	case caseof(XLS_CONNECTED, RTM_ADD):
340	case caseof(XLS_CONNECTING, RTM_ADD):
341	case caseof(XLS_RESOLVING, RTM_ADD):
342	printf("ifrtchange: impossible transition, should panic\n");
343	break;
344
345	case caseof(XLS_RESOLVING, RTM_DELETE):
346	for (m = xl->xl_downq.xq_data; m;) {
347	mold = m;
348	m = m->m_nextpkt;
349	m_freem(mold);
350	}
351	break;
352
353	case caseof(XLS_RESOLVING, RTM_CHANGE):
354	xc->xc_if.if_start(xl, 0, dst);
355	break;
356	}
357	if (xc->xc_if.if_type == IFT_DDN)
358	return; /* reverse name table not necessary */
359	sa2 = SA(rt->rt_key);
360	if (cmd == RTM_CHANGE) {
361	if (sa->sa_family == AF_CCITT) {
362	sa->sa_rfamily = sa2->sa_family;
363	(void) rtrequest(RTM_DELETE, SA(sa), sa2,
364	SA(0), RTF_HOST, (struct rtentry **)0);
365	}
366	sa = (struct sockaddr_x25 *)dst;
367	cmd = RTM_ADD;
368	}
369	if (sa->sa_family == AF_CCITT) {
370	sa->sa_rfamily = sa2->sa_family;
371	(void) rtrequest(cmd, SA(sa), sa2, SA(0), RTF_HOST,
372	(struct rtentry **)0);
373	sa->sa_rfamily = 0;
374	}
375	}
376	static struct sockaddr sin = {sizeof(sin), AF_INET};
377	/*
378	* This is a utility routine to be called by x25 devices when a
379	* call request is honored with the intent of starting datagram forwarding.
380	*/
381	x25_dg_rtinit(dst, xc, af)
382	struct sockaddr_x25 *dst;
383	register struct x25com *xc;
384	{
385	struct sockaddr *sa = 0;
386	if (xc->xc_if.if_type == IFT_DDN && af == AF_INET) {
387	/*
388	* Inverse X25 to IPP mapping copyright and courtesy ACC.
389	*/
390	int imp_no, imp_port, temp;
391	union imp_addr imp_addr;
392	{
393	/*
394	* First determine our IP addr for network
395	*/
396	register struct in_ifaddr *ia;
397	extern struct in_ifaddr *in_ifaddr;
398	for (ia = in_ifaddr; ia; ia = ia->ia_next)
399	if (ia->ia_ifp == &xc->xc_if) {
400	imp_addr.ip = ia->ia_addr.sin_addr;
401	break;
402	}
403	}
404	{
405
406	register char *x25addr = dst->x25_addr;
407
408	switch (x25addr[5] & 0x0f) {
409	case 0: /* Physical: 0000 0 IIIHH00 [SS] */
410	imp_no =
411	((int) (x25addr[6] & 0x0f) * 100) +
412	((int) (x25addr[7] & 0x0f) * 10) +
413	((int) (x25addr[8] & 0x0f));
414
415
416	imp_port =
417	((int) (x25addr[9] & 0x0f) * 10) +
418	((int) (x25addr[10] & 0x0f));
419	break;
420	case 1: /* Logical: 0000 1 RRRRR00 [SS] */
421	temp = ((int) (x25addr[6] & 0x0f) * 10000)
422	+ ((int) (x25addr[7] & 0x0f) * 1000)
423	+ ((int) (x25addr[8] & 0x0f) * 100)
424	+ ((int) (x25addr[9] & 0x0f) * 10)
425	+ ((int) (x25addr[10] & 0x0f));
426
427	imp_port = temp >> 8;
428	imp_no = temp & 0xff;
429	break;
430	default:
431	return (0L);
432	}
433	imp_addr.ip.s_addr = my_addr;
434	if ((imp_addr.imp.s_net & 0x80) == 0x00) {
435	/* class A */
436	imp_addr.imp.s_host = imp_port;
437	imp_addr.imp.s_impno = imp_no;
438	imp_addr.imp.s_lh = 0;
439	} else if ((imp_addr.imp.s_net & 0xc0) == 0x80) {
440	/* class B */
441	imp_addr.imp.s_lh = imp_port;
442	imp_addr.imp.s_impno = imp_no;
443	} else {
444	/* class C */
445	imp_addr.imp.s_impno = (imp_no << 5) + imp_port;
446	}
447	}
448	sin.sin_addr = imp_addr.ip;
449	sa = (struct sockaddr *)&sin;
450	} else {
451	/*
452	* This uses the X25 routing table to do inverse
453	* lookup of x25 address to sockaddr.
454	*/
455	dst->sa_rfamily = af;
456	if (rt = rtalloc1(dst, 0)) {
457	sa = rt->rt_gateway;
458	rt->rt_refcnt--;
459	}
460	dst->sa_rfamily = 0;
461	}
462	/*
463	* Call to rtalloc1 will create rtentry for reverse path
464	* to callee by virtue of cloning magic and will allocate
465	* space for local control block.
466	*/
467	if (sa && rt = rtalloc1(sa, 1))
468	rt->rt_refcnt--;
469	}