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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 1.4 2003/08/07 21:17:38 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 struct ifnet_en *nsip_list; /* list of all hosts and gateways or
90 if (nsipif.if_mtu == 0) {
92 ifp->if_name = "nsip";
94 ifp->if_ioctl = nsipioctl;
95 ifp->if_output = nsipoutput;
96 ifp->if_start = nsipstart;
97 ifp->if_flags = IFF_POINTOPOINT;
100 MALLOC((m), struct ifnet_en *, sizeof(*m), M_PCB, M_NOWAIT);
101 if (m == NULL) return (NULL);
102 m->ifen_next = nsip_list;
104 ifp = &m->ifen_ifnet;
106 ifp->if_name = "nsip";
108 ifp->if_ioctl = nsipioctl;
109 ifp->if_output = nsipoutput;
110 ifp->if_start = nsipstart;
111 ifp->if_flags = IFF_POINTOPOINT;
112 ifp->if_unit = nsipif.if_unit++;
120 * Process an ioctl request.
123 nsipioctl(ifp, cmd, data)
134 ifp->if_flags |= IFF_UP;
139 * Everything else is done at a higher level.
144 ifr = (struct ifreq *)data;
145 if ((ifr->ifr_flags & IFF_UP) == 0)
146 error = nsip_free(ifp);
155 struct mbuf *nsip_badlen;
156 struct mbuf *nsip_lastin;
165 struct ifqueue *ifq = &nsintrq;
168 if (nsip_hold_input) {
170 m_freem(nsip_lastin);
172 nsip_lastin = m_copym(m, 0, (int)M_COPYALL, M_DONTWAIT);
175 * Get IP and IDP header together in first mbuf.
177 nsipif.if_ipackets++;
178 s = sizeof (struct ip) + sizeof (struct idp);
179 if (((m->m_flags & M_EXT) || m->m_len < s) &&
180 (m = m_pullup(m, s)) == 0) {
184 ip = mtod(m, struct ip *);
185 if (ip->ip_hl > (sizeof (struct ip) >> 2)) {
186 ip_stripoptions(m, (struct mbuf *)0);
188 if ((m = m_pullup(m, s)) == 0) {
192 ip = mtod(m, struct ip *);
197 * Make mbuf data length reflect IDP length.
198 * If not enough data to reflect IDP length, drop.
200 m->m_data += sizeof (struct ip);
201 m->m_len -= sizeof (struct ip);
202 m->m_pkthdr.len -= sizeof (struct ip);
203 idp = mtod(m, struct idp *);
204 len = ntohs(idp->idp_len);
205 if (len & 1) len++; /* Preserve Garbage Byte */
206 if (ip->ip_len != len) {
207 if (len > ip->ip_len) {
209 if (nsip_badlen) m_freem(nsip_badlen);
213 /* Any extra will be trimmed off by the NS routines */
217 * Place interface pointer before the data
218 * for the receiving protocol.
220 m->m_pkthdr.rcvif = ifp;
233 schednetisr(NETISR_NS);
239 nsipoutput(ifn, m, dst)
240 struct ifnet_en *ifn;
242 struct sockaddr *dst;
246 struct route *ro = &(ifn->ifen_route);
248 struct idp *idp = mtod(m, struct idp *);
251 ifn->ifen_ifnet.if_opackets++;
252 nsipif.if_opackets++;
256 * Calculate data length and make space
259 len = ntohs(idp->idp_len);
260 if (len & 1) len++; /* Preserve Garbage Byte */
261 /* following clause not necessary on vax */
262 if (3 & (int)m->m_data) {
263 /* force longword alignment of ip hdr */
264 struct mbuf *m0 = m_gethdr(MT_HEADER, M_DONTWAIT);
269 MH_ALIGN(m0, sizeof (struct ip));
270 m0->m_flags = m->m_flags & M_COPYFLAGS;
272 m0->m_len = sizeof (struct ip);
273 m0->m_pkthdr.len = m0->m_len + m->m_len;
274 m->m_flags &= ~M_PKTHDR;
276 M_PREPEND(m, sizeof (struct ip), M_DONTWAIT);
283 ip = mtod(m, struct ip *);
285 ip->ip_p = IPPROTO_IDP;
286 ip->ip_src = ifn->ifen_src;
287 ip->ip_dst = ifn->ifen_dst;
288 ip->ip_len = (u_short)len + sizeof (struct ip);
292 * Output final datagram.
294 error = (ip_output(m, (struct mbuf *)0, ro, SO_BROADCAST, NULL));
296 ifn->ifen_ifnet.if_oerrors++;
297 ifn->ifen_ifnet.if_ierrors = error;
302 return (ENETUNREACH);
308 panic("nsip_start called");
311 struct ifreq ifr = {"nsip0"};
316 struct nsip_req *rq = mtod(m, struct nsip_req *);
317 struct sockaddr_ns *ns_dst = (struct sockaddr_ns *)&rq->rq_ns;
318 struct sockaddr_in *ip_dst = (struct sockaddr_in *)&rq->rq_ip;
320 struct ifnet_en *ifn;
321 struct sockaddr_in *src;
324 * First, make sure we already have an ns address:
326 if (ns_hosteqnh(ns_thishost, ns_zerohost))
327 return (EADDRNOTAVAIL);
329 * Now, determine if we can get to the destination
331 bzero((caddr_t)&ro, sizeof (ro));
332 ro.ro_dst = *(struct sockaddr *)ip_dst;
334 if (ro.ro_rt == 0 || ro.ro_rt->rt_ifp == 0) {
335 return (ENETUNREACH);
339 * And see how he's going to get back to us:
340 * i.e., what return ip address do we use?
343 struct in_ifaddr *ia;
344 struct ifnet *ifp = ro.ro_rt->rt_ifp;
346 for (ia = in_ifaddr; ia; ia = ia->ia_next)
347 if (ia->ia_ifp == ifp)
353 return (EADDRNOTAVAIL);
355 src = (struct sockaddr_in *)&ia->ia_addr;
359 * Is there a free (pseudo-)interface or space?
361 for (ifn = nsip_list; ifn; ifn = ifn->ifen_next) {
362 if ((ifn->ifen_ifnet.if_flags & IFF_UP) == 0)
371 ifn->ifen_route = ro;
372 ifn->ifen_dst = ip_dst->sin_addr;
373 ifn->ifen_src = src->sin_addr;
376 * now configure this as a point to point link
378 ifr.ifr_name[4] = '0' + nsipif.if_unit - 1;
379 ifr.ifr_dstaddr = * (struct sockaddr *) ns_dst;
380 (void)ns_control((struct socket *)0, (int)SIOCSIFDSTADDR, (caddr_t)&ifr,
381 (struct ifnet *)ifn);
382 satons_addr(ifr.ifr_addr).x_host = ns_thishost;
383 return (ns_control((struct socket *)0, (int)SIOCSIFADDR, (caddr_t)&ifr,
384 (struct ifnet *)ifn));
390 struct ifnet_en *ifn = (struct ifnet_en *)ifp;
391 struct route *ro = & ifn->ifen_route;
397 ifp->if_flags &= ~IFF_UP;
401 nsip_ctlinput(cmd, sa)
405 extern u_char inetctlerrmap[];
406 struct sockaddr_in *sin;
409 if ((unsigned)cmd >= PRC_NCMDS)
411 if (sa->sa_family != AF_INET && sa->sa_family != AF_IMPLINK)
413 sin = (struct sockaddr_in *)sa;
414 if (sin->sin_addr.s_addr == INADDR_ANY)
420 case PRC_REDIRECT_NET:
421 case PRC_REDIRECT_HOST:
422 case PRC_REDIRECT_TOSNET:
423 case PRC_REDIRECT_TOSHOST:
424 nsip_rtchange(&sin->sin_addr);
432 struct ifnet_en *ifn;
434 for (ifn = nsip_list; ifn; ifn = ifn->ifen_next) {
435 if (ifn->ifen_dst.s_addr == dst->s_addr &&
436 ifn->ifen_route.ro_rt) {
437 RTFREE(ifn->ifen_route.ro_rt);
438 ifn->ifen_route.ro_rt = 0;