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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 1.12 2005/06/09 02:03:39 hsu 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>
64 #include <machine/stdarg.h>
71 struct ifnet ifen_ifnet;
72 struct route ifen_route;
73 struct in_addr ifen_src;
74 struct in_addr ifen_dst;
75 struct ifnet_en *ifen_next;
78 int nsipoutput(), nsipioctl(), nsipstart();
79 #define LOMTU (1024+512);
82 static int nsipif_units;
83 struct ifnet_en *nsip_list; /* list of all hosts and gateways or
92 if (nsipif.if_mtu == 0) {
94 if_initname(ifp, "nsip", nsipif_units);
96 ifp->if_ioctl = nsipioctl;
97 ifp->if_output = nsipoutput;
98 ifp->if_start = nsipstart;
99 ifp->if_flags = IFF_POINTOPOINT;
102 MALLOC((m), struct ifnet_en *, sizeof(*m), M_PCB, M_WAITOK);
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;
160 #warning "Audit the second argument, this expect ifp, but gets int from netinet"
163 idpip_input(struct mbuf *m, ...)
172 ifp = __va_arg(ap, struct ifnet *);
175 if (nsip_hold_input) {
177 m_freem(nsip_lastin);
179 nsip_lastin = m_copym(m, 0, (int)M_COPYALL, MB_DONTWAIT);
182 * Get IP and IDP header together in first mbuf.
184 nsipif.if_ipackets++;
185 s = sizeof (struct ip) + sizeof (struct idp);
186 if (((m->m_flags & M_EXT) || m->m_len < s) &&
187 (m = m_pullup(m, s)) == 0) {
191 ip = mtod(m, struct ip *);
192 if (ip->ip_hl > (sizeof (struct ip) >> 2)) {
195 if ((m = m_pullup(m, s)) == 0) {
199 ip = mtod(m, struct ip *);
204 * Make mbuf data length reflect IDP length.
205 * If not enough data to reflect IDP length, drop.
207 m->m_data += sizeof (struct ip);
208 m->m_len -= sizeof (struct ip);
209 m->m_pkthdr.len -= sizeof (struct ip);
210 idp = mtod(m, struct idp *);
211 len = ntohs(idp->idp_len);
212 if (len & 1) len++; /* Preserve Garbage Byte */
213 if (ip->ip_len != len) {
214 if (len > ip->ip_len) {
216 if (nsip_badlen) m_freem(nsip_badlen);
220 /* Any extra will be trimmed off by the NS routines */
224 * Place interface pointer before the data
225 * for the receiving protocol.
227 m->m_pkthdr.rcvif = ifp;
231 netisr_dispatch(NETISR_NS, m);
235 nsipoutput(ifn, m, dst)
236 struct ifnet_en *ifn;
238 struct sockaddr *dst;
242 struct route *ro = &(ifn->ifen_route);
244 struct idp *idp = mtod(m, struct idp *);
247 ifn->ifen_ifnet.if_opackets++;
248 nsipif.if_opackets++;
252 * Calculate data length and make space
255 len = ntohs(idp->idp_len);
256 if (len & 1) len++; /* Preserve Garbage Byte */
257 /* following clause not necessary on vax */
258 if (3 & (int)m->m_data) {
259 /* force longword alignment of ip hdr */
260 struct mbuf *m0 = m_gethdr(MT_HEADER, MB_DONTWAIT);
265 MH_ALIGN(m0, sizeof (struct ip));
266 m0->m_flags = m->m_flags & M_COPYFLAGS;
268 m0->m_len = sizeof (struct ip);
269 m0->m_pkthdr.len = m0->m_len + m->m_len;
271 M_PREPEND(m, sizeof (struct ip), MB_DONTWAIT);
278 ip = mtod(m, struct ip *);
280 ip->ip_p = IPPROTO_IDP;
281 ip->ip_src = ifn->ifen_src;
282 ip->ip_dst = ifn->ifen_dst;
283 ip->ip_len = (u_short)len + sizeof (struct ip);
287 * Output final datagram.
289 error = (ip_output(m, (struct mbuf *)0, ro, SO_BROADCAST, NULL));
291 ifn->ifen_ifnet.if_oerrors++;
292 ifn->ifen_ifnet.if_ierrors = error;
297 return (ENETUNREACH);
303 panic("nsip_start called");
306 struct ifreq ifr = {"nsip0"};
311 struct nsip_req *rq = mtod(m, struct nsip_req *);
312 struct sockaddr_ns *ns_dst = (struct sockaddr_ns *)&rq->rq_ns;
313 struct sockaddr_in *ip_dst = (struct sockaddr_in *)&rq->rq_ip;
315 struct ifnet_en *ifn;
316 struct sockaddr_in *src;
319 * First, make sure we already have an ns address:
321 if (ns_hosteqnh(ns_thishost, ns_zerohost))
322 return (EADDRNOTAVAIL);
324 * Now, determine if we can get to the destination
326 bzero((caddr_t)&ro, sizeof (ro));
327 ro.ro_dst = *(struct sockaddr *)ip_dst;
329 if (ro.ro_rt == 0 || ro.ro_rt->rt_ifp == 0) {
330 return (ENETUNREACH);
334 * And see how he's going to get back to us:
335 * i.e., what return ip address do we use?
338 struct in_ifaddr *ia;
339 struct ifnet *ifp = ro.ro_rt->rt_ifp;
341 for (ia = in_ifaddr; ia; ia = ia->ia_next)
342 if (ia->ia_ifp == ifp)
348 return (EADDRNOTAVAIL);
350 src = (struct sockaddr_in *)&ia->ia_addr;
354 * Is there a free (pseudo-)interface or space?
356 for (ifn = nsip_list; ifn; ifn = ifn->ifen_next) {
357 if ((ifn->ifen_ifnet.if_flags & IFF_UP) == 0)
366 ifn->ifen_route = ro;
367 ifn->ifen_dst = ip_dst->sin_addr;
368 ifn->ifen_src = src->sin_addr;
371 * now configure this as a point to point link
373 ifr.ifr_name[4] = '0' + nsipif_units - 1;
374 ifr.ifr_dstaddr = * (struct sockaddr *) ns_dst;
375 (void)ns_control((struct socket *)0, (int)SIOCSIFDSTADDR, (caddr_t)&ifr,
376 (struct ifnet *)ifn, NULL);
377 satons_addr(ifr.ifr_addr).x_host = ns_thishost;
378 return (ns_control((struct socket *)0, (int)SIOCSIFADDR, (caddr_t)&ifr,
379 (struct ifnet *)ifn, NULL));
385 struct ifnet_en *ifn = (struct ifnet_en *)ifp;
386 struct route *ro = & ifn->ifen_route;
392 ifp->if_flags &= ~IFF_UP;
396 nsip_ctlinput(cmd, sa)
400 extern u_char inetctlerrmap[];
401 struct sockaddr_in *sin;
404 if ((unsigned)cmd >= PRC_NCMDS)
406 if (sa->sa_family != AF_INET && sa->sa_family != AF_IMPLINK)
408 sin = (struct sockaddr_in *)sa;
409 if (sin->sin_addr.s_addr == INADDR_ANY)
415 case PRC_REDIRECT_NET:
416 case PRC_REDIRECT_HOST:
417 case PRC_REDIRECT_TOSNET:
418 case PRC_REDIRECT_TOSHOST:
419 nsip_rtchange(&sin->sin_addr);
427 struct ifnet_en *ifn;
429 for (ifn = nsip_list; ifn; ifn = ifn->ifen_next) {
430 if (ifn->ifen_dst.s_addr == dst->s_addr &&
431 ifn->ifen_route.ro_rt) {
432 RTFREE(ifn->ifen_route.ro_rt);
433 ifn->ifen_route.ro_rt = 0;