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33 * @(#)ns_ip.c 8.1 (Berkeley) 6/10/93
38 * Software interface driver for encapsulating ns in ip.
42 #include <sys/param.h>
43 #include <sys/systm.h>
44 #include <sys/malloc.h>
46 #include <sys/socket.h>
47 #include <sys/socketvar.h>
48 #include <sys/errno.h>
49 #include <sys/ioctl.h>
50 #include <sys/protosw.h>
53 #include <net/netisr.h>
54 #include <net/route.h>
56 #include <netinet/in.h>
57 #include <netinet/in_systm.h>
58 #include <netinet/in_var.h>
59 #include <netinet/ip.h>
60 #include <netinet/ip_var.h>
62 #include <machine/mtpr.h>
65 #include <netns/ns_if.h>
66 #include <netns/idp.h>
69 struct ifnet ifen_ifnet;
70 struct route ifen_route;
71 struct in_addr ifen_src;
72 struct in_addr ifen_dst;
73 struct ifnet_en *ifen_next;
76 int nsipoutput(), nsipioctl(), nsipstart();
77 #define LOMTU (1024+512);
80 struct ifnet_en *nsip_list; /* list of all hosts and gateways or
86 register struct ifnet_en *m;
87 register struct ifnet *ifp;
89 if (nsipif.if_mtu == 0) {
91 ifp->if_name = "nsip";
93 ifp->if_ioctl = nsipioctl;
94 ifp->if_output = nsipoutput;
95 ifp->if_start = nsipstart;
96 ifp->if_flags = IFF_POINTOPOINT;
99 MALLOC((m), struct ifnet_en *, sizeof(*m), M_PCB, M_NOWAIT);
100 if (m == NULL) return (NULL);
101 m->ifen_next = nsip_list;
103 ifp = &m->ifen_ifnet;
105 ifp->if_name = "nsip";
107 ifp->if_ioctl = nsipioctl;
108 ifp->if_output = nsipoutput;
109 ifp->if_start = nsipstart;
110 ifp->if_flags = IFF_POINTOPOINT;
111 ifp->if_unit = nsipif.if_unit++;
119 * Process an ioctl request.
122 nsipioctl(ifp, cmd, data)
123 register struct ifnet *ifp;
133 ifp->if_flags |= IFF_UP;
138 * Everything else is done at a higher level.
143 ifr = (struct ifreq *)data;
144 if ((ifr->ifr_flags & IFF_UP) == 0)
145 error = nsip_free(ifp);
154 struct mbuf *nsip_badlen;
155 struct mbuf *nsip_lastin;
159 register struct mbuf *m;
162 register struct ip *ip;
163 register struct idp *idp;
164 register struct ifqueue *ifq = &nsintrq;
167 if (nsip_hold_input) {
169 m_freem(nsip_lastin);
171 nsip_lastin = m_copym(m, 0, (int)M_COPYALL, M_DONTWAIT);
174 * Get IP and IDP header together in first mbuf.
176 nsipif.if_ipackets++;
177 s = sizeof (struct ip) + sizeof (struct idp);
178 if (((m->m_flags & M_EXT) || m->m_len < s) &&
179 (m = m_pullup(m, s)) == 0) {
183 ip = mtod(m, struct ip *);
184 if (ip->ip_hl > (sizeof (struct ip) >> 2)) {
185 ip_stripoptions(m, (struct mbuf *)0);
187 if ((m = m_pullup(m, s)) == 0) {
191 ip = mtod(m, struct ip *);
196 * Make mbuf data length reflect IDP length.
197 * If not enough data to reflect IDP length, drop.
199 m->m_data += sizeof (struct ip);
200 m->m_len -= sizeof (struct ip);
201 m->m_pkthdr.len -= sizeof (struct ip);
202 idp = mtod(m, struct idp *);
203 len = ntohs(idp->idp_len);
204 if (len & 1) len++; /* Preserve Garbage Byte */
205 if (ip->ip_len != len) {
206 if (len > ip->ip_len) {
208 if (nsip_badlen) m_freem(nsip_badlen);
212 /* Any extra will be trimmed off by the NS routines */
216 * Place interface pointer before the data
217 * for the receiving protocol.
219 m->m_pkthdr.rcvif = ifp;
223 if (IF_HANDOFF(ifq, m, NULL))
224 schednetisr(NETISR_NS);
229 nsipoutput(ifn, m, dst)
230 struct ifnet_en *ifn;
231 register struct mbuf *m;
232 struct sockaddr *dst;
235 register struct ip *ip;
236 register struct route *ro = &(ifn->ifen_route);
237 register int len = 0;
238 register 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"};
304 register struct mbuf *m;
306 register 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 register 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.if_unit - 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 register 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);
420 register struct in_addr *dst;
422 register 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;