1 /* 2 * Copyright (c) 1982 Regents of the University of California. 3 * All rights reserved. The Berkeley software License Agreement 4 * specifies the terms and conditions for redistribution. 5 * 6 * @(#)ns_ip.c 6.7 (Berkeley) 09/06/85 7 */ 8 9 /* 10 * Software interface driver for encapsulating ns in ip. 11 */ 12 13 #ifdef NSIP 14 #include "param.h" 15 #include "systm.h" 16 #include "mbuf.h" 17 #include "socket.h" 18 #include "socketvar.h" 19 #include "errno.h" 20 #include "ioctl.h" 21 22 #include "../net/if.h" 23 #include "../net/netisr.h" 24 #include "../net/route.h" 25 26 #include "../netinet/in.h" 27 #include "../netinet/in_systm.h" 28 #include "../netinet/in_var.h" 29 #include "../netinet/ip.h" 30 #include "../netinet/ip_var.h" 31 32 #ifdef vax 33 #include "../vax/mtpr.h" 34 #endif 35 36 #include "../netns/ns.h" 37 #include "../netns/ns_if.h" 38 #include "../netns/idp.h" 39 40 #ifdef BBNNET 41 #include "../bbnnet/in_pcb.h" 42 #include "../bbnnet/nopcb.h" 43 #endif 44 45 struct ifnet_en { 46 struct ifnet ifen_ifnet; 47 struct route ifen_route; 48 struct in_addr ifen_src; 49 struct in_addr ifen_dst; 50 }; 51 52 int nsipoutput(), nsipioctl(); 53 #define LOMTU (1024+512); 54 55 struct ifnet nsipif; 56 union ns_net nsip_net; 57 struct mbuf *nsip_list; /* list of all hosts and gateways or 58 broadcast addrs */ 59 60 struct mbuf * 61 nsipattach() 62 { 63 register struct mbuf *m = m_getclr(M_DONTWAIT, MT_PCB); 64 register struct ifnet *ifp; 65 66 if (m==0) return (0); 67 m->m_off = MMINOFF; 68 m->m_len = sizeof(struct ifnet_en); 69 m->m_next = nsip_list; 70 nsip_list = m; 71 ifp = mtod(m, struct ifnet *); 72 73 ifp->if_name = "nsip"; 74 ifp->if_mtu = LOMTU; 75 ifp->if_ioctl = nsipioctl; 76 ifp->if_output = nsipoutput; 77 ifp->if_flags = IFF_POINTOPOINT; 78 ifp->if_unit = nsipif.if_unit++; 79 if_attach(ifp); 80 return(dtom(ifp)); 81 } 82 83 84 /* 85 * Process an ioctl request. 86 */ 87 /* ARGSUSED */ 88 nsipioctl(ifp, cmd, data) 89 register struct ifnet *ifp; 90 int cmd; 91 caddr_t data; 92 { 93 int error = 0; 94 95 switch (cmd) { 96 97 case SIOCSIFADDR: 98 ifp->if_flags |= IFF_UP; 99 /* 100 * Everything else is done at a higher level. 101 */ 102 break; 103 104 default: 105 error = EINVAL; 106 } 107 return (error); 108 } 109 110 struct mbuf *nsip_badlen; 111 struct mbuf *nsip_lastin; 112 int nsip_hold_input; 113 114 idpip_input(m, ifp) 115 register struct mbuf *m; 116 struct ifnet *ifp; 117 { 118 register struct ip *ip; 119 register struct idp *idp; 120 register struct ifqueue *ifq = &nsintrq; 121 int len, s; 122 123 if(nsip_hold_input) { 124 if(nsip_lastin) { 125 m_freem(nsip_lastin); 126 } 127 nsip_lastin = m_copy(m, 0, (int)M_COPYALL); 128 } 129 /* 130 * Get IP and IDP header together in first mbuf. 131 */ 132 nsipif.if_ipackets++; 133 s = sizeof (struct ip) + sizeof (struct idp); 134 if ((m->m_off > MMAXOFF || m->m_len < s) && 135 (m = m_pullup(m, s))==0) { 136 nsipif.if_ierrors++; 137 return; 138 } 139 ip = mtod(m, struct ip *); 140 141 /* 142 * Make mbuf data length reflect IDP length. 143 * If not enough data to reflect IDP length, drop. 144 */ 145 m->m_off += sizeof (struct ip); 146 m->m_len -= sizeof (struct ip); 147 idp = mtod(m, struct idp *); 148 len = ntohs(idp->idp_len); 149 if (len & 1) len++; /* Preserve Garbage Byte */ 150 if (ip->ip_len != len) { 151 if (len > ip->ip_len) { 152 nsipif.if_ierrors++; 153 if(nsip_badlen) m_freem(nsip_badlen); 154 nsip_badlen = m; 155 return; 156 } 157 /* Any extra will be trimmed off by the NS routines */ 158 } 159 160 /* 161 * Place interface pointer before the data 162 * for the receiving protocol. 163 */ 164 if (m->m_off >= MMINOFF + sizeof(struct ifnet *)) { 165 m->m_off -= sizeof(struct ifnet *); 166 m->m_len += sizeof(struct ifnet *); 167 } else { 168 struct mbuf *n; 169 170 n = m_get(M_DONTWAIT, MT_HEADER); 171 if (n == (struct mbuf *)0) 172 goto bad; 173 n->m_off = MMINOFF; 174 n->m_len = sizeof(struct ifnet *); 175 n->m_next = m; 176 m = n; 177 } 178 *(mtod(m, struct ifnet **)) = ifp; 179 180 /* 181 * Deliver to NS 182 */ 183 s = splimp(); 184 if (IF_QFULL(ifq)) { 185 IF_DROP(ifq); 186 bad: 187 m_freem(m); 188 splx(s); 189 return; 190 } 191 IF_ENQUEUE(ifq, m); 192 schednetisr(NETISR_NS); 193 splx(s); 194 return; 195 } 196 197 /* ARGSUSED */ 198 nsipoutput(ifn, m0, dst) 199 struct ifnet_en *ifn; 200 struct mbuf *m0; 201 struct sockaddr *dst; 202 { 203 204 register struct mbuf *m = dtom(ifn); 205 register struct ip *ip; 206 register struct route *ro = &(ifn->ifen_route); 207 register int len = 0; 208 register struct idp *idp = mtod(m0, struct idp *); 209 int error; 210 211 if (m->m_len != sizeof(struct ifnet_en)) { 212 printf("nsipoutput: bad dst ifp %x\n", ifn); 213 goto bad; 214 } 215 ifn->ifen_ifnet.if_opackets++; 216 nsipif.if_opackets++; 217 218 219 /* 220 * Calculate data length and make space 221 * for IP header. 222 */ 223 len = ntohs(idp->idp_len); 224 if (len & 1) len++; /* Preserve Garbage Byte */ 225 m = m0; 226 if(m->m_off < MMINOFF + sizeof (struct ip)) { 227 m = m_get(M_DONTWAIT, MT_HEADER); 228 if (m == 0) { 229 m_freem(m0); 230 return (ENOBUFS); 231 } 232 m->m_off = MMAXOFF - sizeof (struct ip); 233 m->m_len = sizeof (struct ip); 234 m->m_next = m0; 235 } else { 236 m->m_off -= sizeof (struct ip); 237 m->m_len += sizeof (struct ip); 238 } 239 /* 240 * Fill in IP header. 241 */ 242 ip = mtod(m, struct ip *); 243 *(long *)ip = 0; 244 ip->ip_p = IPPROTO_IDP; 245 ip->ip_src = ifn->ifen_src; 246 ip->ip_dst = ifn->ifen_dst; 247 #ifdef BBNNET 248 ip->ip_tos = 0; 249 NOPCB_IPSEND(m, len, 0, error); 250 #else 251 ip->ip_len = (u_short)len + sizeof (struct ip); 252 ip->ip_ttl = MAXTTL; 253 254 /* 255 * Output final datagram. 256 */ 257 error = (ip_output(m, (struct mbuf *)0, ro, SO_BROADCAST)); 258 #endif 259 if (error) { 260 ifn->ifen_ifnet.if_oerrors++; 261 ifn->ifen_ifnet.if_ierrors = error; 262 } 263 return (error); 264 bad: 265 m_freem(m0); 266 return(ENETUNREACH); 267 } 268 269 struct ifreq ifr = {"nsip0"}; 270 271 nsip_route(m) 272 register struct mbuf *m; 273 { 274 register struct nsip_req *rq = mtod(m, struct nsip_req *); 275 struct sockaddr_ns *ns_dst = (struct sockaddr_ns *)&rq->rq_ns; 276 struct sockaddr_in *ip_dst = (struct sockaddr_in *)&rq->rq_ip; 277 struct route ro; 278 struct ifnet_en *ifn; 279 struct sockaddr_in *src; 280 /* 281 * First, determine if we can get to the destination 282 */ 283 bzero((caddr_t)&ro, sizeof (ro)); 284 ro.ro_dst = *(struct sockaddr *)ip_dst; 285 rtalloc(&ro); 286 if (ro.ro_rt == 0 || ro.ro_rt->rt_ifp == 0) { 287 return (ENETUNREACH); 288 } 289 /* 290 * And see how he's going to get back to us: 291 */ 292 { 293 register struct in_ifaddr *ia; 294 struct ifnet *ifp = ro.ro_rt->rt_ifp; 295 296 for (ia = in_ifaddr; ia; ia = ia->ia_next) 297 if (ia->ia_ifp == ifp) 298 break; 299 if (ia == 0) 300 ia = in_ifaddr; 301 if (ia == 0) { 302 return (EADDRNOTAVAIL); 303 } 304 src = (struct sockaddr_in *)&ia->ia_addr; 305 } 306 /* 307 * Is there space? 308 */ 309 m = nsipattach(); 310 if (m==NULL) {return (ENOBUFS);} 311 ifn = mtod(m, struct ifnet_en *); 312 313 ro.ro_rt->rt_use++; 314 ifn->ifen_route = ro; 315 ifn->ifen_dst = ip_dst->sin_addr; 316 ifn->ifen_src = src->sin_addr; 317 318 /* 319 * now configure this as a point to point link 320 */ 321 ifr.ifr_name[4] = '0' + nsipif.if_unit - 1; 322 ifr.ifr_dstaddr = * (struct sockaddr *) ns_dst; 323 return(ns_control((struct socket *)0, (int)SIOCSIFADDR, (caddr_t)&ifr, 324 (struct ifnet *)ifn)); 325 } 326 #endif 327