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 6.6 (Berkeley) 08/23/85 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(m0) 115 struct mbuf *m0; 116 { 117 register struct ip *ip; 118 register struct idp *idp; 119 register struct mbuf *m; 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(m0, 0, (int)M_COPYALL); 128 } 129 /* 130 * Get IP and IDP header together in first mbuf. 131 */ 132 nsipif.if_ipackets++; 133 m = m0; 134 s = sizeof (struct ip) + sizeof (struct idp); 135 if ((m->m_off > MMAXOFF || m->m_len < s) && 136 (m = m_pullup(m, s))==0) { 137 nsipif.if_ierrors++; 138 return; 139 } 140 ip = mtod(m, struct ip *); 141 #ifndef BBNNET 142 if (ip->ip_hl > (sizeof (struct ip) >> 2)) { 143 ip_stripoptions(ip, (struct mbuf *)0); 144 if (m->m_len < s) { 145 if ((m = m_pullup(m, s))==0) { 146 nsipif.if_ierrors++; 147 return; 148 } 149 ip = mtod(m, struct ip *); 150 } 151 } 152 #endif 153 154 /* 155 * Make mbuf data length reflect IDP length. 156 * If not enough data to reflect IDP length, drop. 157 */ 158 m->m_off += sizeof (struct ip); 159 m->m_len -= sizeof (struct ip); 160 idp = mtod(m, struct idp *); 161 len = ntohs(idp->idp_len); 162 if (len & 1) len++; /* Preserve Garbage Byte */ 163 if (ip->ip_len != len) { 164 if (len > ip->ip_len) { 165 nsipif.if_ierrors++; 166 if(nsip_badlen) m_freem(nsip_badlen); 167 nsip_badlen = m; 168 return; 169 } 170 /* Any extra will be trimmed off by the NS routines */ 171 } 172 /* 173 * Deliver to NS 174 */ 175 s = splimp(); 176 if (IF_QFULL(ifq)) { 177 IF_DROP(ifq); 178 m_freem(m0); 179 splx(s); 180 return; 181 } 182 IF_ENQUEUE(ifq, m0); 183 schednetisr(NETISR_NS); 184 splx(s); 185 return; 186 } 187 188 /* ARGSUSED */ 189 nsipoutput(ifn, m0, dst) 190 struct ifnet_en *ifn; 191 struct mbuf *m0; 192 struct sockaddr *dst; 193 { 194 195 register struct mbuf *m = dtom(ifn); 196 register struct ip *ip; 197 register struct route *ro = &(ifn->ifen_route); 198 register int len = 0; 199 register struct idp *idp = mtod(m0, struct idp *); 200 int error; 201 202 if (m->m_len != sizeof(struct ifnet_en)) { 203 printf("nsipoutput: bad dst ifp %x\n", ifn); 204 goto bad; 205 } 206 ifn->ifen_ifnet.if_opackets++; 207 nsipif.if_opackets++; 208 209 210 /* 211 * Calculate data length and make space 212 * for IP header. 213 */ 214 len = ntohs(idp->idp_len); 215 if (len & 1) len++; /* Preserve Garbage Byte */ 216 m = m0; 217 if(m->m_off < MMINOFF + sizeof (struct ip)) { 218 m = m_get(M_DONTWAIT, MT_HEADER); 219 if (m == 0) { 220 m_freem(m0); 221 return (ENOBUFS); 222 } 223 m->m_off = MMAXOFF - sizeof (struct ip); 224 m->m_len = sizeof (struct ip); 225 m->m_next = m0; 226 } else { 227 m->m_off -= sizeof (struct ip); 228 m->m_len += sizeof (struct ip); 229 } 230 /* 231 * Fill in IP header. 232 */ 233 ip = mtod(m, struct ip *); 234 *(long *)ip = 0; 235 ip->ip_p = IPPROTO_IDP; 236 ip->ip_src = ifn->ifen_src; 237 ip->ip_dst = ifn->ifen_dst; 238 #ifdef BBNNET 239 ip->ip_tos = 0; 240 NOPCB_IPSEND(m, len, 0, error); 241 #else 242 ip->ip_len = (u_short)len + sizeof (struct ip); 243 ip->ip_ttl = MAXTTL; 244 245 /* 246 * Output final datagram. 247 */ 248 error = (ip_output(m, (struct mbuf *)0, ro, SO_BROADCAST)); 249 #endif 250 if (error) { 251 ifn->ifen_ifnet.if_oerrors++; 252 ifn->ifen_ifnet.if_ierrors = error; 253 } 254 return (error); 255 bad: 256 m_freem(m0); 257 return(ENETUNREACH); 258 } 259 260 struct ifreq ifr = {"nsip0"}; 261 262 nsip_route(m) 263 register struct mbuf *m; 264 { 265 register struct nsip_req *rq = mtod(m, struct nsip_req *); 266 struct sockaddr_ns *ns_dst = (struct sockaddr_ns *)&rq->rq_ns; 267 struct sockaddr_in *ip_dst = (struct sockaddr_in *)&rq->rq_ip; 268 struct route ro; 269 struct ifnet_en *ifn; 270 struct sockaddr_in *src; 271 /* 272 * First, determine if we can get to the destination 273 */ 274 bzero((caddr_t)&ro, sizeof (ro)); 275 ro.ro_dst = *(struct sockaddr *)ip_dst; 276 rtalloc(&ro); 277 if (ro.ro_rt == 0 || ro.ro_rt->rt_ifp == 0) { 278 return (ENETUNREACH); 279 } 280 /* 281 * And see how he's going to get back to us: 282 */ 283 { 284 register struct in_ifaddr *ia; 285 struct ifnet *ifp = ro.ro_rt->rt_ifp; 286 287 for (ia = in_ifaddr; ia; ia = ia->ia_next) 288 if (ia->ia_ifp == ifp) 289 break; 290 if (ia == 0) 291 ia = in_ifaddr; 292 if (ia == 0) { 293 return (EADDRNOTAVAIL); 294 } 295 src = (struct sockaddr_in *)&ia->ia_addr; 296 } 297 /* 298 * Is there space? 299 */ 300 m = nsipattach(); 301 if (m==NULL) {return (ENOBUFS);} 302 ifn = mtod(m, struct ifnet_en *); 303 304 ro.ro_rt->rt_use++; 305 ifn->ifen_route = ro; 306 ifn->ifen_dst = ip_dst->sin_addr; 307 ifn->ifen_src = src->sin_addr; 308 309 /* 310 * now configure this as a point to point link 311 */ 312 ifr.ifr_name[4] = '0' + nsipif.if_unit - 1; 313 ifr.ifr_dstaddr = * (struct sockaddr *) ns_dst; 314 return(ns_control((struct socket *)0, (int)SIOCSIFADDR, (caddr_t)&ifr, 315 (struct ifnet *)ifn)); 316 } 317 #endif 318