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33 * @(#)ns_ip.c 8.1 (Berkeley) 6/10/93
34 * $FreeBSD: src/sys/netns/ns_ip.c,v 1.9 1999/08/28 00:49:50 peter Exp $
35 * $DragonFly: src/sys/netproto/ns/ns_ip.c,v 1.6 2004/01/06 03:17:28 dillon Exp $
39 * Software interface driver for encapsulating ns in ip.
43 #include <sys/param.h>
44 #include <sys/systm.h>
45 #include <sys/malloc.h>
47 #include <sys/socket.h>
48 #include <sys/socketvar.h>
49 #include <sys/errno.h>
50 #include <sys/ioctl.h>
51 #include <sys/protosw.h>
54 #include <net/netisr.h>
55 #include <net/route.h>
57 #include <netinet/in.h>
58 #include <netinet/in_systm.h>
59 #include <netinet/in_var.h>
60 #include <netinet/ip.h>
61 #include <netinet/ip_var.h>
63 #include <machine/mtpr.h>
70 struct ifnet ifen_ifnet;
71 struct route ifen_route;
72 struct in_addr ifen_src;
73 struct in_addr ifen_dst;
74 struct ifnet_en *ifen_next;
77 int nsipoutput(), nsipioctl(), nsipstart();
78 #define LOMTU (1024+512);
81 static int nsipif_units;
82 struct ifnet_en *nsip_list; /* list of all hosts and gateways or
91 if (nsipif.if_mtu == 0) {
93 if_initname(ifp, "nsip", nsipif_units);
95 ifp->if_ioctl = nsipioctl;
96 ifp->if_output = nsipoutput;
97 ifp->if_start = nsipstart;
98 ifp->if_flags = IFF_POINTOPOINT;
101 MALLOC((m), struct ifnet_en *, sizeof(*m), M_PCB, M_NOWAIT);
102 if (m == NULL) return (NULL);
103 m->ifen_next = nsip_list;
105 ifp = &m->ifen_ifnet;
107 if_initname(ifp, "nsip", nsipif_units++);
108 ifp->if_name = "nsip";
110 ifp->if_ioctl = nsipioctl;
111 ifp->if_output = nsipoutput;
112 ifp->if_start = nsipstart;
113 ifp->if_flags = IFF_POINTOPOINT;
121 * Process an ioctl request.
124 nsipioctl(ifp, cmd, data)
135 ifp->if_flags |= IFF_UP;
140 * Everything else is done at a higher level.
145 ifr = (struct ifreq *)data;
146 if ((ifr->ifr_flags & IFF_UP) == 0)
147 error = nsip_free(ifp);
156 struct mbuf *nsip_badlen;
157 struct mbuf *nsip_lastin;
169 if (nsip_hold_input) {
171 m_freem(nsip_lastin);
173 nsip_lastin = m_copym(m, 0, (int)M_COPYALL, M_DONTWAIT);
176 * Get IP and IDP header together in first mbuf.
178 nsipif.if_ipackets++;
179 s = sizeof (struct ip) + sizeof (struct idp);
180 if (((m->m_flags & M_EXT) || m->m_len < s) &&
181 (m = m_pullup(m, s)) == 0) {
185 ip = mtod(m, struct ip *);
186 if (ip->ip_hl > (sizeof (struct ip) >> 2)) {
187 ip_stripoptions(m, (struct mbuf *)0);
189 if ((m = m_pullup(m, s)) == 0) {
193 ip = mtod(m, struct ip *);
198 * Make mbuf data length reflect IDP length.
199 * If not enough data to reflect IDP length, drop.
201 m->m_data += sizeof (struct ip);
202 m->m_len -= sizeof (struct ip);
203 m->m_pkthdr.len -= sizeof (struct ip);
204 idp = mtod(m, struct idp *);
205 len = ntohs(idp->idp_len);
206 if (len & 1) len++; /* Preserve Garbage Byte */
207 if (ip->ip_len != len) {
208 if (len > ip->ip_len) {
210 if (nsip_badlen) m_freem(nsip_badlen);
214 /* Any extra will be trimmed off by the NS routines */
218 * Place interface pointer before the data
219 * for the receiving protocol.
221 m->m_pkthdr.rcvif = ifp;
225 netisr_dispatch(NETISR_NS, m);
229 nsipoutput(ifn, m, dst)
230 struct ifnet_en *ifn;
232 struct sockaddr *dst;
236 struct route *ro = &(ifn->ifen_route);
238 struct idp *idp = mtod(m, struct idp *);
241 ifn->ifen_ifnet.if_opackets++;
242 nsipif.if_opackets++;
246 * Calculate data length and make space
249 len = ntohs(idp->idp_len);
250 if (len & 1) len++; /* Preserve Garbage Byte */
251 /* following clause not necessary on vax */
252 if (3 & (int)m->m_data) {
253 /* force longword alignment of ip hdr */
254 struct mbuf *m0 = m_gethdr(MT_HEADER, M_DONTWAIT);
259 MH_ALIGN(m0, sizeof (struct ip));
260 m0->m_flags = m->m_flags & M_COPYFLAGS;
262 m0->m_len = sizeof (struct ip);
263 m0->m_pkthdr.len = m0->m_len + m->m_len;
264 m->m_flags &= ~M_PKTHDR;
266 M_PREPEND(m, sizeof (struct ip), M_DONTWAIT);
273 ip = mtod(m, struct ip *);
275 ip->ip_p = IPPROTO_IDP;
276 ip->ip_src = ifn->ifen_src;
277 ip->ip_dst = ifn->ifen_dst;
278 ip->ip_len = (u_short)len + sizeof (struct ip);
282 * Output final datagram.
284 error = (ip_output(m, (struct mbuf *)0, ro, SO_BROADCAST, NULL));
286 ifn->ifen_ifnet.if_oerrors++;
287 ifn->ifen_ifnet.if_ierrors = error;
292 return (ENETUNREACH);
298 panic("nsip_start called");
301 struct ifreq ifr = {"nsip0"};
306 struct nsip_req *rq = mtod(m, struct nsip_req *);
307 struct sockaddr_ns *ns_dst = (struct sockaddr_ns *)&rq->rq_ns;
308 struct sockaddr_in *ip_dst = (struct sockaddr_in *)&rq->rq_ip;
310 struct ifnet_en *ifn;
311 struct sockaddr_in *src;
314 * First, make sure we already have an ns address:
316 if (ns_hosteqnh(ns_thishost, ns_zerohost))
317 return (EADDRNOTAVAIL);
319 * Now, determine if we can get to the destination
321 bzero((caddr_t)&ro, sizeof (ro));
322 ro.ro_dst = *(struct sockaddr *)ip_dst;
324 if (ro.ro_rt == 0 || ro.ro_rt->rt_ifp == 0) {
325 return (ENETUNREACH);
329 * And see how he's going to get back to us:
330 * i.e., what return ip address do we use?
333 struct in_ifaddr *ia;
334 struct ifnet *ifp = ro.ro_rt->rt_ifp;
336 for (ia = in_ifaddr; ia; ia = ia->ia_next)
337 if (ia->ia_ifp == ifp)
343 return (EADDRNOTAVAIL);
345 src = (struct sockaddr_in *)&ia->ia_addr;
349 * Is there a free (pseudo-)interface or space?
351 for (ifn = nsip_list; ifn; ifn = ifn->ifen_next) {
352 if ((ifn->ifen_ifnet.if_flags & IFF_UP) == 0)
361 ifn->ifen_route = ro;
362 ifn->ifen_dst = ip_dst->sin_addr;
363 ifn->ifen_src = src->sin_addr;
366 * now configure this as a point to point link
368 ifr.ifr_name[4] = '0' + nsipif_units - 1;
369 ifr.ifr_dstaddr = * (struct sockaddr *) ns_dst;
370 (void)ns_control((struct socket *)0, (int)SIOCSIFDSTADDR, (caddr_t)&ifr,
371 (struct ifnet *)ifn);
372 satons_addr(ifr.ifr_addr).x_host = ns_thishost;
373 return (ns_control((struct socket *)0, (int)SIOCSIFADDR, (caddr_t)&ifr,
374 (struct ifnet *)ifn));
380 struct ifnet_en *ifn = (struct ifnet_en *)ifp;
381 struct route *ro = & ifn->ifen_route;
387 ifp->if_flags &= ~IFF_UP;
391 nsip_ctlinput(cmd, sa)
395 extern u_char inetctlerrmap[];
396 struct sockaddr_in *sin;
399 if ((unsigned)cmd >= PRC_NCMDS)
401 if (sa->sa_family != AF_INET && sa->sa_family != AF_IMPLINK)
403 sin = (struct sockaddr_in *)sa;
404 if (sin->sin_addr.s_addr == INADDR_ANY)
410 case PRC_REDIRECT_NET:
411 case PRC_REDIRECT_HOST:
412 case PRC_REDIRECT_TOSNET:
413 case PRC_REDIRECT_TOSHOST:
414 nsip_rtchange(&sin->sin_addr);
422 struct ifnet_en *ifn;
424 for (ifn = nsip_list; ifn; ifn = ifn->ifen_next) {
425 if (ifn->ifen_dst.s_addr == dst->s_addr &&
426 ifn->ifen_route.ro_rt) {
427 RTFREE(ifn->ifen_route.ro_rt);
428 ifn->ifen_route.ro_rt = 0;