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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 1.14 2006/01/14 13:36:40 swildner 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;
114 if_attach(ifp, NULL);
121 * Process an ioctl request.
125 nsipioctl(struct ifnet *ifp, int cmd, caddr_t data)
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;
158 #warning "Audit the second argument, this expect ifp, but gets int from netinet"
161 idpip_input(struct mbuf *m, ...)
170 ifp = __va_arg(ap, struct ifnet *);
173 if (nsip_hold_input) {
175 m_freem(nsip_lastin);
177 nsip_lastin = m_copym(m, 0, (int)M_COPYALL, MB_DONTWAIT);
180 * Get IP and IDP header together in first mbuf.
182 nsipif.if_ipackets++;
183 s = sizeof (struct ip) + sizeof (struct idp);
184 if (((m->m_flags & M_EXT) || m->m_len < s) &&
185 (m = m_pullup(m, s)) == 0) {
189 ip = mtod(m, struct ip *);
190 if (ip->ip_hl > (sizeof (struct ip) >> 2)) {
193 if ((m = m_pullup(m, s)) == 0) {
197 ip = mtod(m, struct ip *);
202 * Make mbuf data length reflect IDP length.
203 * If not enough data to reflect IDP length, drop.
205 m->m_data += sizeof (struct ip);
206 m->m_len -= sizeof (struct ip);
207 m->m_pkthdr.len -= sizeof (struct ip);
208 idp = mtod(m, struct idp *);
209 len = ntohs(idp->idp_len);
210 if (len & 1) len++; /* Preserve Garbage Byte */
211 if (ip->ip_len != len) {
212 if (len > ip->ip_len) {
214 if (nsip_badlen) m_freem(nsip_badlen);
218 /* Any extra will be trimmed off by the NS routines */
222 * Place interface pointer before the data
223 * for the receiving protocol.
225 m->m_pkthdr.rcvif = ifp;
229 netisr_dispatch(NETISR_NS, m);
234 nsipoutput(struct ifnet_en *ifn, struct mbuf *m, struct sockaddr *dst)
238 struct route *ro = &(ifn->ifen_route);
240 struct idp *idp = mtod(m, struct idp *);
243 ifn->ifen_ifnet.if_opackets++;
244 nsipif.if_opackets++;
248 * Calculate data length and make space
251 len = ntohs(idp->idp_len);
252 if (len & 1) len++; /* Preserve Garbage Byte */
253 /* following clause not necessary on vax */
254 if (3 & (int)m->m_data) {
255 /* force longword alignment of ip hdr */
256 struct mbuf *m0 = m_gethdr(MT_HEADER, MB_DONTWAIT);
261 MH_ALIGN(m0, sizeof (struct ip));
262 m0->m_flags = m->m_flags & M_COPYFLAGS;
264 m0->m_len = sizeof (struct ip);
265 m0->m_pkthdr.len = m0->m_len + m->m_len;
267 M_PREPEND(m, sizeof (struct ip), MB_DONTWAIT);
274 ip = mtod(m, struct ip *);
276 ip->ip_p = IPPROTO_IDP;
277 ip->ip_src = ifn->ifen_src;
278 ip->ip_dst = ifn->ifen_dst;
279 ip->ip_len = (u_short)len + sizeof (struct ip);
283 * Output final datagram.
285 error = (ip_output(m, (struct mbuf *)0, ro, SO_BROADCAST, NULL));
287 ifn->ifen_ifnet.if_oerrors++;
288 ifn->ifen_ifnet.if_ierrors = error;
293 return (ENETUNREACH);
297 nsipstart(struct ifnet *ifp)
299 panic("nsip_start called");
302 struct ifreq ifr = {"nsip0"};
305 nsip_route(struct mbuf *m)
307 struct nsip_req *rq = mtod(m, struct nsip_req *);
308 struct sockaddr_ns *ns_dst = (struct sockaddr_ns *)&rq->rq_ns;
309 struct sockaddr_in *ip_dst = (struct sockaddr_in *)&rq->rq_ip;
311 struct ifnet_en *ifn;
312 struct sockaddr_in *src;
315 * First, make sure we already have an ns address:
317 if (ns_hosteqnh(ns_thishost, ns_zerohost))
318 return (EADDRNOTAVAIL);
320 * Now, determine if we can get to the destination
322 bzero((caddr_t)&ro, sizeof (ro));
323 ro.ro_dst = *(struct sockaddr *)ip_dst;
325 if (ro.ro_rt == 0 || ro.ro_rt->rt_ifp == 0) {
326 return (ENETUNREACH);
330 * And see how he's going to get back to us:
331 * i.e., what return ip address do we use?
334 struct in_ifaddr *ia;
335 struct ifnet *ifp = ro.ro_rt->rt_ifp;
337 for (ia = in_ifaddr; ia; ia = ia->ia_next)
338 if (ia->ia_ifp == ifp)
344 return (EADDRNOTAVAIL);
346 src = (struct sockaddr_in *)&ia->ia_addr;
350 * Is there a free (pseudo-)interface or space?
352 for (ifn = nsip_list; ifn; ifn = ifn->ifen_next) {
353 if ((ifn->ifen_ifnet.if_flags & IFF_UP) == 0)
362 ifn->ifen_route = ro;
363 ifn->ifen_dst = ip_dst->sin_addr;
364 ifn->ifen_src = src->sin_addr;
367 * now configure this as a point to point link
369 ifr.ifr_name[4] = '0' + nsipif_units - 1;
370 ifr.ifr_dstaddr = * (struct sockaddr *) ns_dst;
371 ns_control((struct socket *)0, (int)SIOCSIFDSTADDR, (caddr_t)&ifr,
372 (struct ifnet *)ifn, NULL);
373 satons_addr(ifr.ifr_addr).x_host = ns_thishost;
374 return (ns_control((struct socket *)0, (int)SIOCSIFADDR, (caddr_t)&ifr,
375 (struct ifnet *)ifn, NULL));
379 nsip_free(struct ifnet *ifp)
381 struct ifnet_en *ifn = (struct ifnet_en *)ifp;
382 struct route *ro = & ifn->ifen_route;
388 ifp->if_flags &= ~IFF_UP;
393 nsip_ctlinput(int cmd, struct sockaddr *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 nsip_rtchange(struct in_addr *dst)
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;