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 6.5 (Berkeley) 08/09/85 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 struct ifnet_en { 41 struct ifnet ifen_ifnet; 42 struct route ifen_route; 43 struct in_addr ifen_src; 44 struct in_addr ifen_dst; 45 }; 46 47 int nsipoutput(), nsipioctl(); 48 #define LOMTU (1024+512); 49 50 struct ifnet nsipif; 51 union ns_net nsip_net; 52 struct mbuf *nsip_list; /* list of all hosts and gateways or 53 broadcast addrs */ 54 55 struct mbuf * 56 nsipattach() 57 { 58 register struct mbuf *m = m_getclr(M_DONTWAIT, MT_PCB); 59 register struct ifnet *ifp; 60 61 if (m==0) return (0); 62 m->m_off = MMINOFF; 63 m->m_len = sizeof(struct ifnet_en); 64 m->m_next = nsip_list; 65 nsip_list = m; 66 ifp = mtod(m, struct ifnet *); 67 68 ifp->if_name = "nsip"; 69 ifp->if_mtu = LOMTU; 70 ifp->if_ioctl = nsipioctl; 71 ifp->if_output = nsipoutput; 72 ifp->if_flags = IFF_POINTOPOINT; 73 ifp->if_unit = nsipif.if_unit++; 74 if_attach(ifp); 75 return(dtom(ifp)); 76 } 77 78 79 /* 80 * Process an ioctl request. 81 */ 82 /* ARGSUSED */ 83 nsipioctl(ifp, cmd, data) 84 register struct ifnet *ifp; 85 int cmd; 86 caddr_t data; 87 { 88 int error = 0; 89 90 switch (cmd) { 91 92 case SIOCSIFADDR: 93 ifp->if_flags |= IFF_UP; 94 /* 95 * Everything else is done at a higher level. 96 */ 97 break; 98 99 default: 100 error = EINVAL; 101 } 102 return (error); 103 } 104 105 struct mbuf *nsip_badlen; 106 struct mbuf *nsip_lastin; 107 int nsip_hold_input; 108 109 idpip_input(m0) 110 struct mbuf *m0; 111 { 112 register struct ip *ip; 113 register struct idp *idp; 114 register struct mbuf *m; 115 register struct ifqueue *ifq = &nsintrq; 116 int len, s; 117 118 if(nsip_hold_input) { 119 if(nsip_lastin) { 120 m_freem(nsip_lastin); 121 } 122 nsip_lastin = m_copy(m0, 0, (int)M_COPYALL); 123 } 124 /* 125 * Get IP and IDP header together in first mbuf. 126 */ 127 nsipif.if_ipackets++; 128 m = m0; 129 s = sizeof (struct ip) + sizeof (struct idp); 130 if ((m->m_off > MMAXOFF || m->m_len < s) && 131 (m = m_pullup(m, s))==0) { 132 nsipif.if_ierrors++; 133 return; 134 } 135 ip = mtod(m, struct ip *); 136 if (ip->ip_hl > (sizeof (struct ip) >> 2)) { 137 ip_stripoptions(ip, (struct mbuf *)0); 138 if (m->m_len < s) { 139 if ((m = m_pullup(m, s))==0) { 140 nsipif.if_ierrors++; 141 return; 142 } 143 ip = mtod(m, struct ip *); 144 } 145 } 146 147 /* 148 * Make mbuf data length reflect IDP length. 149 * If not enough data to reflect IDP length, drop. 150 */ 151 m->m_off += sizeof (struct ip); 152 m->m_len -= sizeof (struct ip); 153 idp = mtod(m, struct idp *); 154 len = ntohs(idp->idp_len); 155 if (len & 1) len++; /* Preserve Garbage Byte */ 156 if (ip->ip_len != len) { 157 if (len > ip->ip_len) { 158 nsipif.if_ierrors++; 159 if(nsip_badlen) m_freem(nsip_badlen); 160 nsip_badlen = m; 161 return; 162 } 163 /* Any extra will be trimmed off by the NS routines */ 164 } 165 /* 166 * Deliver to NS 167 */ 168 s = splimp(); 169 if (IF_QFULL(ifq)) { 170 IF_DROP(ifq); 171 m_freem(m0); 172 splx(s); 173 return; 174 } 175 IF_ENQUEUE(ifq, m0); 176 schednetisr(NETISR_NS); 177 splx(s); 178 return; 179 } 180 181 /* ARGSUSED */ 182 nsipoutput(ifn, m0, dst) 183 struct ifnet_en *ifn; 184 struct mbuf *m0; 185 struct sockaddr *dst; 186 { 187 188 register struct mbuf *m = dtom(ifn); 189 register struct ip *ip; 190 register struct route *ro = &(ifn->ifen_route); 191 register int len = 0; 192 register struct idp *idp = mtod(m0, struct idp *); 193 int error; 194 195 if (m->m_len != sizeof(struct ifnet_en)) { 196 printf("nsipoutput: bad dst ifp %x\n", ifn); 197 goto bad; 198 } 199 ifn->ifen_ifnet.if_opackets++; 200 nsipif.if_opackets++; 201 202 203 /* 204 * Calculate data length and make space 205 * for IP header. 206 */ 207 len = ntohs(idp->idp_len); 208 if (len & 1) len++; /* Preserve Garbage Byte */ 209 m = m0; 210 if(m->m_off < MMINOFF + sizeof (struct ip)) { 211 m = m_get(M_DONTWAIT, MT_HEADER); 212 if (m == 0) { 213 m_freem(m0); 214 return (ENOBUFS); 215 } 216 m->m_off = MMAXOFF - sizeof (struct ip); 217 m->m_len = sizeof (struct ip); 218 m->m_next = m0; 219 } else { 220 m->m_off -= sizeof (struct ip); 221 m->m_len += sizeof (struct ip); 222 } 223 /* 224 * Fill in IP header. 225 */ 226 ip = mtod(m, struct ip *); 227 *(long *)ip = 0; 228 ip->ip_p = IPPROTO_IDP; 229 ip->ip_src = ifn->ifen_src; 230 ip->ip_dst = ifn->ifen_dst; 231 ip->ip_len = (u_short)len + sizeof (struct ip); 232 ip->ip_ttl = MAXTTL; 233 234 /* 235 * Output final datagram. 236 */ 237 error = (ip_output(m, (struct mbuf *)0, ro, SO_BROADCAST)); 238 if (error) { 239 ifn->ifen_ifnet.if_oerrors++; 240 ifn->ifen_ifnet.if_ierrors = error; 241 } 242 return (error); 243 bad: 244 m_freem(m0); 245 return(ENETUNREACH); 246 } 247 248 struct ifreq ifr = {"nsip0"}; 249 250 nsip_route(m) 251 register struct mbuf *m; 252 { 253 register struct nsip_req *rq = mtod(m, struct nsip_req *); 254 struct sockaddr_ns *ns_dst = (struct sockaddr_ns *)&rq->rq_ns; 255 struct sockaddr_in *ip_dst = (struct sockaddr_in *)&rq->rq_ip; 256 struct route ro; 257 struct ifnet_en *ifn; 258 struct sockaddr_in *src; 259 /* 260 * First, determine if we can get to the destination 261 */ 262 bzero((caddr_t)&ro, sizeof (ro)); 263 ro.ro_dst = *(struct sockaddr *)ip_dst; 264 rtalloc(&ro); 265 if (ro.ro_rt == 0 || ro.ro_rt->rt_ifp == 0) { 266 return (ENETUNREACH); 267 } 268 /* 269 * And see how he's going to get back to us: 270 */ 271 { 272 register struct in_ifaddr *ia; 273 struct ifnet *ifp = ro.ro_rt->rt_ifp; 274 275 for (ia = in_ifaddr; ia; ia = ia->ia_next) 276 if (ia->ia_ifp == ifp) 277 break; 278 if (ia == 0) 279 ia = in_ifaddr; 280 if (ia == 0) { 281 return (EADDRNOTAVAIL); 282 } 283 src = (struct sockaddr_in *)&ia->ia_addr; 284 } 285 /* 286 * Is there space? 287 */ 288 m = nsipattach(); 289 if (m==NULL) {return (ENOBUFS);} 290 ifn = mtod(m, struct ifnet_en *); 291 292 ro.ro_rt->rt_use++; 293 ifn->ifen_route = ro; 294 ifn->ifen_dst = ip_dst->sin_addr; 295 ifn->ifen_src = src->sin_addr; 296 297 /* 298 * now configure this as a point to point link 299 */ 300 ifr.ifr_name[4] = '0' + nsipif.if_unit - 1; 301 ifr.ifr_dstaddr = * (struct sockaddr *) ns_dst; 302 return(ns_control((struct socket *)0, (int)SIOCSIFADDR, (caddr_t)&ifr, 303 (struct ifnet *)ifn)); 304 } 305 #endif 306