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 7.11 (Berkeley) 06/27/91 8 */ 9 10 #include "param.h" 11 #include "systm.h" 12 #include "mbuf.h" 13 #include "errno.h" 14 #include "socket.h" 15 #include "socketvar.h" 16 #include "protosw.h" 17 18 #include "../net/if.h" 19 #include "../net/route.h" 20 21 #include "ns.h" 22 #include "ns_if.h" 23 #include "ns_pcb.h" 24 25 struct ns_addr zerons_addr; 26 27 ns_pcballoc(so, head) 28 struct socket *so; 29 struct nspcb *head; 30 { 31 struct mbuf *m; 32 register struct nspcb *nsp; 33 34 m = m_getclr(M_DONTWAIT, MT_PCB); 35 if (m == NULL) 36 return (ENOBUFS); 37 nsp = mtod(m, struct nspcb *); 38 nsp->nsp_socket = so; 39 insque(nsp, head); 40 so->so_pcb = (caddr_t)nsp; 41 return (0); 42 } 43 44 ns_pcbbind(nsp, nam) 45 register struct nspcb *nsp; 46 struct mbuf *nam; 47 { 48 register struct sockaddr_ns *sns; 49 u_short lport = 0; 50 51 if (nsp->nsp_lport || !ns_nullhost(nsp->nsp_laddr)) 52 return (EINVAL); 53 if (nam == 0) 54 goto noname; 55 sns = mtod(nam, struct sockaddr_ns *); 56 if (nam->m_len != sizeof (*sns)) 57 return (EINVAL); 58 if (!ns_nullhost(sns->sns_addr)) { 59 int tport = sns->sns_port; 60 61 sns->sns_port = 0; /* yech... */ 62 if (ifa_ifwithaddr((struct sockaddr *)sns) == 0) 63 return (EADDRNOTAVAIL); 64 sns->sns_port = tport; 65 } 66 lport = sns->sns_port; 67 if (lport) { 68 u_short aport = ntohs(lport); 69 70 if (aport < NSPORT_RESERVED && 71 (nsp->nsp_socket->so_state & SS_PRIV) == 0) 72 return (EACCES); 73 if (ns_pcblookup(&zerons_addr, lport, 0)) 74 return (EADDRINUSE); 75 } 76 nsp->nsp_laddr = sns->sns_addr; 77 noname: 78 if (lport == 0) 79 do { 80 if (nspcb.nsp_lport++ < NSPORT_RESERVED) 81 nspcb.nsp_lport = NSPORT_RESERVED; 82 lport = htons(nspcb.nsp_lport); 83 } while (ns_pcblookup(&zerons_addr, lport, 0)); 84 nsp->nsp_lport = lport; 85 return (0); 86 } 87 88 /* 89 * Connect from a socket to a specified address. 90 * Both address and port must be specified in argument sns. 91 * If don't have a local address for this socket yet, 92 * then pick one. 93 */ 94 ns_pcbconnect(nsp, nam) 95 struct nspcb *nsp; 96 struct mbuf *nam; 97 { 98 struct ns_ifaddr *ia; 99 register struct sockaddr_ns *sns = mtod(nam, struct sockaddr_ns *); 100 register struct ns_addr *dst; 101 register struct route *ro; 102 struct ifnet *ifp; 103 104 if (nam->m_len != sizeof (*sns)) 105 return (EINVAL); 106 if (sns->sns_family != AF_NS) 107 return (EAFNOSUPPORT); 108 if (sns->sns_port==0 || ns_nullhost(sns->sns_addr)) 109 return (EADDRNOTAVAIL); 110 /* 111 * If we haven't bound which network number to use as ours, 112 * we will use the number of the outgoing interface. 113 * This depends on having done a routing lookup, which 114 * we will probably have to do anyway, so we might 115 * as well do it now. On the other hand if we are 116 * sending to multiple destinations we may have already 117 * done the lookup, so see if we can use the route 118 * from before. In any case, we only 119 * chose a port number once, even if sending to multiple 120 * destinations. 121 */ 122 ro = &nsp->nsp_route; 123 dst = &satons_addr(ro->ro_dst); 124 if (nsp->nsp_socket->so_options & SO_DONTROUTE) 125 goto flush; 126 if (!ns_neteq(nsp->nsp_lastdst, sns->sns_addr)) 127 goto flush; 128 if (!ns_hosteq(nsp->nsp_lastdst, sns->sns_addr)) { 129 if (ro->ro_rt && ! (ro->ro_rt->rt_flags & RTF_HOST)) { 130 /* can patch route to avoid rtalloc */ 131 *dst = sns->sns_addr; 132 } else { 133 flush: 134 if (ro->ro_rt) 135 RTFREE(ro->ro_rt); 136 ro->ro_rt = (struct rtentry *)0; 137 nsp->nsp_laddr.x_net = ns_zeronet; 138 } 139 }/* else cached route is ok; do nothing */ 140 nsp->nsp_lastdst = sns->sns_addr; 141 if ((nsp->nsp_socket->so_options & SO_DONTROUTE) == 0 && /*XXX*/ 142 (ro->ro_rt == (struct rtentry *)0 || 143 ro->ro_rt->rt_ifp == (struct ifnet *)0)) { 144 /* No route yet, so try to acquire one */ 145 ro->ro_dst.sa_family = AF_NS; 146 ro->ro_dst.sa_len = sizeof(ro->ro_dst); 147 *dst = sns->sns_addr; 148 dst->x_port = 0; 149 rtalloc(ro); 150 } 151 if (ns_neteqnn(nsp->nsp_laddr.x_net, ns_zeronet)) { 152 /* 153 * If route is known or can be allocated now, 154 * our src addr is taken from the i/f, else punt. 155 */ 156 157 ia = (struct ns_ifaddr *)0; 158 /* 159 * If we found a route, use the address 160 * corresponding to the outgoing interface 161 */ 162 if (ro->ro_rt && (ifp = ro->ro_rt->rt_ifp)) 163 for (ia = ns_ifaddr; ia; ia = ia->ia_next) 164 if (ia->ia_ifp == ifp) 165 break; 166 if (ia == 0) { 167 u_short fport = sns->sns_addr.x_port; 168 sns->sns_addr.x_port = 0; 169 ia = (struct ns_ifaddr *) 170 ifa_ifwithdstaddr((struct sockaddr *)sns); 171 sns->sns_addr.x_port = fport; 172 if (ia == 0) 173 ia = ns_iaonnetof(&sns->sns_addr); 174 if (ia == 0) 175 ia = ns_ifaddr; 176 if (ia == 0) 177 return (EADDRNOTAVAIL); 178 } 179 nsp->nsp_laddr.x_net = satons_addr(ia->ia_addr).x_net; 180 } 181 if (ns_pcblookup(&sns->sns_addr, nsp->nsp_lport, 0)) 182 return (EADDRINUSE); 183 if (ns_nullhost(nsp->nsp_laddr)) { 184 if (nsp->nsp_lport == 0) 185 (void) ns_pcbbind(nsp, (struct mbuf *)0); 186 nsp->nsp_laddr.x_host = ns_thishost; 187 } 188 nsp->nsp_faddr = sns->sns_addr; 189 /* Includes nsp->nsp_fport = sns->sns_port; */ 190 return (0); 191 } 192 193 ns_pcbdisconnect(nsp) 194 struct nspcb *nsp; 195 { 196 197 nsp->nsp_faddr = zerons_addr; 198 if (nsp->nsp_socket->so_state & SS_NOFDREF) 199 ns_pcbdetach(nsp); 200 } 201 202 ns_pcbdetach(nsp) 203 struct nspcb *nsp; 204 { 205 struct socket *so = nsp->nsp_socket; 206 207 so->so_pcb = 0; 208 sofree(so); 209 if (nsp->nsp_route.ro_rt) 210 rtfree(nsp->nsp_route.ro_rt); 211 remque(nsp); 212 (void) m_free(dtom(nsp)); 213 } 214 215 ns_setsockaddr(nsp, nam) 216 register struct nspcb *nsp; 217 struct mbuf *nam; 218 { 219 register struct sockaddr_ns *sns = mtod(nam, struct sockaddr_ns *); 220 221 nam->m_len = sizeof (*sns); 222 sns = mtod(nam, struct sockaddr_ns *); 223 bzero((caddr_t)sns, sizeof (*sns)); 224 sns->sns_len = sizeof(*sns); 225 sns->sns_family = AF_NS; 226 sns->sns_addr = nsp->nsp_laddr; 227 } 228 229 ns_setpeeraddr(nsp, nam) 230 register struct nspcb *nsp; 231 struct mbuf *nam; 232 { 233 register struct sockaddr_ns *sns = mtod(nam, struct sockaddr_ns *); 234 235 nam->m_len = sizeof (*sns); 236 sns = mtod(nam, struct sockaddr_ns *); 237 bzero((caddr_t)sns, sizeof (*sns)); 238 sns->sns_len = sizeof(*sns); 239 sns->sns_family = AF_NS; 240 sns->sns_addr = nsp->nsp_faddr; 241 } 242 243 /* 244 * Pass some notification to all connections of a protocol 245 * associated with address dst. Call the 246 * protocol specific routine to handle each connection. 247 * Also pass an extra paramter via the nspcb. (which may in fact 248 * be a parameter list!) 249 */ 250 ns_pcbnotify(dst, errno, notify, param) 251 register struct ns_addr *dst; 252 long param; 253 int errno, (*notify)(); 254 { 255 register struct nspcb *nsp, *oinp; 256 int s = splimp(); 257 258 for (nsp = (&nspcb)->nsp_next; nsp != (&nspcb);) { 259 if (!ns_hosteq(*dst,nsp->nsp_faddr)) { 260 next: 261 nsp = nsp->nsp_next; 262 continue; 263 } 264 if (nsp->nsp_socket == 0) 265 goto next; 266 if (errno) 267 nsp->nsp_socket->so_error = errno; 268 oinp = nsp; 269 nsp = nsp->nsp_next; 270 oinp->nsp_notify_param = param; 271 (*notify)(oinp); 272 } 273 splx(s); 274 } 275 276 #ifdef notdef 277 /* 278 * After a routing change, flush old routing 279 * and allocate a (hopefully) better one. 280 */ 281 ns_rtchange(nsp) 282 struct nspcb *nsp; 283 { 284 if (nsp->nsp_route.ro_rt) { 285 rtfree(nsp->nsp_route.ro_rt); 286 nsp->nsp_route.ro_rt = 0; 287 /* 288 * A new route can be allocated the next time 289 * output is attempted. 290 */ 291 } 292 /* SHOULD NOTIFY HIGHER-LEVEL PROTOCOLS */ 293 } 294 #endif 295 296 struct nspcb * 297 ns_pcblookup(faddr, lport, wildp) 298 struct ns_addr *faddr; 299 u_short lport; 300 { 301 register struct nspcb *nsp, *match = 0; 302 int matchwild = 3, wildcard; 303 u_short fport; 304 305 fport = faddr->x_port; 306 for (nsp = (&nspcb)->nsp_next; nsp != (&nspcb); nsp = nsp->nsp_next) { 307 if (nsp->nsp_lport != lport) 308 continue; 309 wildcard = 0; 310 if (ns_nullhost(nsp->nsp_faddr)) { 311 if (!ns_nullhost(*faddr)) 312 wildcard++; 313 } else { 314 if (ns_nullhost(*faddr)) 315 wildcard++; 316 else { 317 if (!ns_hosteq(nsp->nsp_faddr, *faddr)) 318 continue; 319 if (nsp->nsp_fport != fport) { 320 if (nsp->nsp_fport != 0) 321 continue; 322 else 323 wildcard++; 324 } 325 } 326 } 327 if (wildcard && wildp==0) 328 continue; 329 if (wildcard < matchwild) { 330 match = nsp; 331 matchwild = wildcard; 332 if (wildcard == 0) 333 break; 334 } 335 } 336 return (match); 337 } 338