1 /* 2 * Copyright (c) 1984, 1985, 1986, 1987 Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 * 7 * @(#)ns_pcb.c 7.10 (Berkeley) 11/20/90 8 */ 9 10 #include "param.h" 11 #include "systm.h" 12 #include "user.h" 13 #include "mbuf.h" 14 #include "socket.h" 15 #include "socketvar.h" 16 #include "../net/if.h" 17 #include "../net/route.h" 18 #include "protosw.h" 19 20 #include "ns.h" 21 #include "ns_if.h" 22 #include "ns_pcb.h" 23 24 struct ns_addr zerons_addr; 25 26 ns_pcballoc(so, head) 27 struct socket *so; 28 struct nspcb *head; 29 { 30 struct mbuf *m; 31 register struct nspcb *nsp; 32 33 m = m_getclr(M_DONTWAIT, MT_PCB); 34 if (m == NULL) 35 return (ENOBUFS); 36 nsp = mtod(m, struct nspcb *); 37 nsp->nsp_socket = so; 38 insque(nsp, head); 39 so->so_pcb = (caddr_t)nsp; 40 return (0); 41 } 42 43 ns_pcbbind(nsp, nam) 44 register struct nspcb *nsp; 45 struct mbuf *nam; 46 { 47 register struct sockaddr_ns *sns; 48 u_short lport = 0; 49 50 if (nsp->nsp_lport || !ns_nullhost(nsp->nsp_laddr)) 51 return (EINVAL); 52 if (nam == 0) 53 goto noname; 54 sns = mtod(nam, struct sockaddr_ns *); 55 if (nam->m_len != sizeof (*sns)) 56 return (EINVAL); 57 if (!ns_nullhost(sns->sns_addr)) { 58 int tport = sns->sns_port; 59 60 sns->sns_port = 0; /* yech... */ 61 if (ifa_ifwithaddr((struct sockaddr *)sns) == 0) 62 return (EADDRNOTAVAIL); 63 sns->sns_port = tport; 64 } 65 lport = sns->sns_port; 66 if (lport) { 67 u_short aport = ntohs(lport); 68 69 if (aport < NSPORT_RESERVED && u.u_uid != 0) 70 return (EACCES); 71 if (ns_pcblookup(&zerons_addr, lport, 0)) 72 return (EADDRINUSE); 73 } 74 nsp->nsp_laddr = sns->sns_addr; 75 noname: 76 if (lport == 0) 77 do { 78 if (nspcb.nsp_lport++ < NSPORT_RESERVED) 79 nspcb.nsp_lport = NSPORT_RESERVED; 80 lport = htons(nspcb.nsp_lport); 81 } while (ns_pcblookup(&zerons_addr, lport, 0)); 82 nsp->nsp_lport = lport; 83 return (0); 84 } 85 86 /* 87 * Connect from a socket to a specified address. 88 * Both address and port must be specified in argument sns. 89 * If don't have a local address for this socket yet, 90 * then pick one. 91 */ 92 ns_pcbconnect(nsp, nam) 93 struct nspcb *nsp; 94 struct mbuf *nam; 95 { 96 struct ns_ifaddr *ia; 97 register struct sockaddr_ns *sns = mtod(nam, struct sockaddr_ns *); 98 register struct ns_addr *dst; 99 register struct route *ro; 100 struct ifnet *ifp; 101 102 if (nam->m_len != sizeof (*sns)) 103 return (EINVAL); 104 if (sns->sns_family != AF_NS) 105 return (EAFNOSUPPORT); 106 if (sns->sns_port==0 || ns_nullhost(sns->sns_addr)) 107 return (EADDRNOTAVAIL); 108 /* 109 * If we haven't bound which network number to use as ours, 110 * we will use the number of the outgoing interface. 111 * This depends on having done a routing lookup, which 112 * we will probably have to do anyway, so we might 113 * as well do it now. On the other hand if we are 114 * sending to multiple destinations we may have already 115 * done the lookup, so see if we can use the route 116 * from before. In any case, we only 117 * chose a port number once, even if sending to multiple 118 * destinations. 119 */ 120 ro = &nsp->nsp_route; 121 dst = &satons_addr(ro->ro_dst); 122 if (nsp->nsp_socket->so_options & SO_DONTROUTE) 123 goto flush; 124 if (!ns_neteq(nsp->nsp_lastdst, sns->sns_addr)) 125 goto flush; 126 if (!ns_hosteq(nsp->nsp_lastdst, sns->sns_addr)) { 127 if (ro->ro_rt && ! (ro->ro_rt->rt_flags & RTF_HOST)) { 128 /* can patch route to avoid rtalloc */ 129 *dst = sns->sns_addr; 130 } else { 131 flush: 132 if (ro->ro_rt) 133 RTFREE(ro->ro_rt); 134 ro->ro_rt = (struct rtentry *)0; 135 nsp->nsp_laddr.x_net = ns_zeronet; 136 } 137 }/* else cached route is ok; do nothing */ 138 nsp->nsp_lastdst = sns->sns_addr; 139 if ((nsp->nsp_socket->so_options & SO_DONTROUTE) == 0 && /*XXX*/ 140 (ro->ro_rt == (struct rtentry *)0 || 141 ro->ro_rt->rt_ifp == (struct ifnet *)0)) { 142 /* No route yet, so try to acquire one */ 143 ro->ro_dst.sa_family = AF_NS; 144 ro->ro_dst.sa_len = sizeof(ro->ro_dst); 145 *dst = sns->sns_addr; 146 dst->x_port = 0; 147 rtalloc(ro); 148 } 149 if (ns_neteqnn(nsp->nsp_laddr.x_net, ns_zeronet)) { 150 /* 151 * If route is known or can be allocated now, 152 * our src addr is taken from the i/f, else punt. 153 */ 154 155 ia = (struct ns_ifaddr *)0; 156 /* 157 * If we found a route, use the address 158 * corresponding to the outgoing interface 159 */ 160 if (ro->ro_rt && (ifp = ro->ro_rt->rt_ifp)) 161 for (ia = ns_ifaddr; ia; ia = ia->ia_next) 162 if (ia->ia_ifp == ifp) 163 break; 164 if (ia == 0) { 165 u_short fport = sns->sns_addr.x_port; 166 sns->sns_addr.x_port = 0; 167 ia = (struct ns_ifaddr *) 168 ifa_ifwithdstaddr((struct sockaddr *)sns); 169 sns->sns_addr.x_port = fport; 170 if (ia == 0) 171 ia = ns_iaonnetof(&sns->sns_addr); 172 if (ia == 0) 173 ia = ns_ifaddr; 174 if (ia == 0) 175 return (EADDRNOTAVAIL); 176 } 177 nsp->nsp_laddr.x_net = satons_addr(ia->ia_addr).x_net; 178 } 179 if (ns_pcblookup(&sns->sns_addr, nsp->nsp_lport, 0)) 180 return (EADDRINUSE); 181 if (ns_nullhost(nsp->nsp_laddr)) { 182 if (nsp->nsp_lport == 0) 183 (void) ns_pcbbind(nsp, (struct mbuf *)0); 184 nsp->nsp_laddr.x_host = ns_thishost; 185 } 186 nsp->nsp_faddr = sns->sns_addr; 187 /* Includes nsp->nsp_fport = sns->sns_port; */ 188 return (0); 189 } 190 191 ns_pcbdisconnect(nsp) 192 struct nspcb *nsp; 193 { 194 195 nsp->nsp_faddr = zerons_addr; 196 if (nsp->nsp_socket->so_state & SS_NOFDREF) 197 ns_pcbdetach(nsp); 198 } 199 200 ns_pcbdetach(nsp) 201 struct nspcb *nsp; 202 { 203 struct socket *so = nsp->nsp_socket; 204 205 so->so_pcb = 0; 206 sofree(so); 207 if (nsp->nsp_route.ro_rt) 208 rtfree(nsp->nsp_route.ro_rt); 209 remque(nsp); 210 (void) m_free(dtom(nsp)); 211 } 212 213 ns_setsockaddr(nsp, nam) 214 register struct nspcb *nsp; 215 struct mbuf *nam; 216 { 217 register struct sockaddr_ns *sns = mtod(nam, struct sockaddr_ns *); 218 219 nam->m_len = sizeof (*sns); 220 sns = mtod(nam, struct sockaddr_ns *); 221 bzero((caddr_t)sns, sizeof (*sns)); 222 sns->sns_len = sizeof(*sns); 223 sns->sns_family = AF_NS; 224 sns->sns_addr = nsp->nsp_laddr; 225 } 226 227 ns_setpeeraddr(nsp, nam) 228 register struct nspcb *nsp; 229 struct mbuf *nam; 230 { 231 register struct sockaddr_ns *sns = mtod(nam, struct sockaddr_ns *); 232 233 nam->m_len = sizeof (*sns); 234 sns = mtod(nam, struct sockaddr_ns *); 235 bzero((caddr_t)sns, sizeof (*sns)); 236 sns->sns_len = sizeof(*sns); 237 sns->sns_family = AF_NS; 238 sns->sns_addr = nsp->nsp_faddr; 239 } 240 241 /* 242 * Pass some notification to all connections of a protocol 243 * associated with address dst. Call the 244 * protocol specific routine to handle each connection. 245 * Also pass an extra paramter via the nspcb. (which may in fact 246 * be a parameter list!) 247 */ 248 ns_pcbnotify(dst, errno, notify, param) 249 register struct ns_addr *dst; 250 long param; 251 int errno, (*notify)(); 252 { 253 register struct nspcb *nsp, *oinp; 254 int s = splimp(); 255 256 for (nsp = (&nspcb)->nsp_next; nsp != (&nspcb);) { 257 if (!ns_hosteq(*dst,nsp->nsp_faddr)) { 258 next: 259 nsp = nsp->nsp_next; 260 continue; 261 } 262 if (nsp->nsp_socket == 0) 263 goto next; 264 if (errno) 265 nsp->nsp_socket->so_error = errno; 266 oinp = nsp; 267 nsp = nsp->nsp_next; 268 oinp->nsp_notify_param = param; 269 (*notify)(oinp); 270 } 271 splx(s); 272 } 273 274 #ifdef notdef 275 /* 276 * After a routing change, flush old routing 277 * and allocate a (hopefully) better one. 278 */ 279 ns_rtchange(nsp) 280 struct nspcb *nsp; 281 { 282 if (nsp->nsp_route.ro_rt) { 283 rtfree(nsp->nsp_route.ro_rt); 284 nsp->nsp_route.ro_rt = 0; 285 /* 286 * A new route can be allocated the next time 287 * output is attempted. 288 */ 289 } 290 /* SHOULD NOTIFY HIGHER-LEVEL PROTOCOLS */ 291 } 292 #endif 293 294 struct nspcb * 295 ns_pcblookup(faddr, lport, wildp) 296 struct ns_addr *faddr; 297 u_short lport; 298 { 299 register struct nspcb *nsp, *match = 0; 300 int matchwild = 3, wildcard; 301 u_short fport; 302 303 fport = faddr->x_port; 304 for (nsp = (&nspcb)->nsp_next; nsp != (&nspcb); nsp = nsp->nsp_next) { 305 if (nsp->nsp_lport != lport) 306 continue; 307 wildcard = 0; 308 if (ns_nullhost(nsp->nsp_faddr)) { 309 if (!ns_nullhost(*faddr)) 310 wildcard++; 311 } else { 312 if (ns_nullhost(*faddr)) 313 wildcard++; 314 else { 315 if (!ns_hosteq(nsp->nsp_faddr, *faddr)) 316 continue; 317 if (nsp->nsp_fport != fport) { 318 if (nsp->nsp_fport != 0) 319 continue; 320 else 321 wildcard++; 322 } 323 } 324 } 325 if (wildcard && wildp==0) 326 continue; 327 if (wildcard < matchwild) { 328 match = nsp; 329 matchwild = wildcard; 330 if (wildcard == 0) 331 break; 332 } 333 } 334 return (match); 335 } 336