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 7.9 (Berkeley) 06/28/90 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 (ro->ro_rt) { 123 if (nsp->nsp_socket->so_options & SO_DONTROUTE) 124 goto flush; 125 if (!ns_neteq(nsp->nsp_lastdst, sns->sns_addr)) 126 goto flush; 127 if (!ns_hosteq(nsp->nsp_lastdst, sns->sns_addr)) { 128 if (((ro->ro_rt->rt_flags & (RTF_GATEWAY|RTF_HOST)) 129 == RTF_GATEWAY) 130 || ((ifp = ro->ro_rt->rt_ifp) && 131 !(ifp->if_flags & IFF_POINTOPOINT))) { 132 /* can patch route to avoid rtalloc */ 133 *dst = sns->sns_addr; 134 } else { 135 flush: 136 RTFREE(ro->ro_rt); 137 ro->ro_rt = (struct rtentry *)0; 138 } 139 }/* else cached route is ok; do nothing */ 140 } 141 nsp->nsp_lastdst = sns->sns_addr; 142 if ((nsp->nsp_socket->so_options & SO_DONTROUTE) == 0 && /*XXX*/ 143 (ro->ro_rt == (struct rtentry *)0 || 144 ro->ro_rt->rt_ifp == (struct ifnet *)0)) { 145 /* No route yet, so try to acquire one */ 146 ro->ro_dst.sa_family = AF_NS; 147 ro->ro_dst.sa_len = sizeof(ro->ro_dst); 148 *dst = sns->sns_addr; 149 dst->x_port = 0; 150 rtalloc(ro); 151 } 152 if (ns_neteqnn(nsp->nsp_laddr.x_net, ns_zeronet)) { 153 /* 154 * If route is known or can be allocated now, 155 * our src addr is taken from the i/f, else punt. 156 */ 157 158 ia = (struct ns_ifaddr *)0; 159 /* 160 * If we found a route, use the address 161 * corresponding to the outgoing interface 162 */ 163 if (ro->ro_rt && (ifp = ro->ro_rt->rt_ifp)) 164 for (ia = ns_ifaddr; ia; ia = ia->ia_next) 165 if (ia->ia_ifp == ifp) 166 break; 167 if (ia == 0) { 168 u_short fport = sns->sns_addr.x_port; 169 sns->sns_addr.x_port = 0; 170 ia = (struct ns_ifaddr *) 171 ifa_ifwithdstaddr((struct sockaddr *)sns); 172 sns->sns_addr.x_port = fport; 173 if (ia == 0) 174 ia = ns_iaonnetof(&sns->sns_addr); 175 if (ia == 0) 176 ia = ns_ifaddr; 177 if (ia == 0) 178 return (EADDRNOTAVAIL); 179 } 180 nsp->nsp_laddr.x_net = satons_addr(ia->ia_addr).x_net; 181 } 182 if (ns_pcblookup(&sns->sns_addr, nsp->nsp_lport, 0)) 183 return (EADDRINUSE); 184 if (ns_nullhost(nsp->nsp_laddr)) { 185 if (nsp->nsp_lport == 0) 186 (void) ns_pcbbind(nsp, (struct mbuf *)0); 187 nsp->nsp_laddr.x_host = ns_thishost; 188 } 189 nsp->nsp_faddr = sns->sns_addr; 190 /* Includes nsp->nsp_fport = sns->sns_port; */ 191 return (0); 192 } 193 194 ns_pcbdisconnect(nsp) 195 struct nspcb *nsp; 196 { 197 198 nsp->nsp_faddr = zerons_addr; 199 if (nsp->nsp_socket->so_state & SS_NOFDREF) 200 ns_pcbdetach(nsp); 201 } 202 203 ns_pcbdetach(nsp) 204 struct nspcb *nsp; 205 { 206 struct socket *so = nsp->nsp_socket; 207 208 so->so_pcb = 0; 209 sofree(so); 210 if (nsp->nsp_route.ro_rt) 211 rtfree(nsp->nsp_route.ro_rt); 212 remque(nsp); 213 (void) m_free(dtom(nsp)); 214 } 215 216 ns_setsockaddr(nsp, nam) 217 register struct nspcb *nsp; 218 struct mbuf *nam; 219 { 220 register struct sockaddr_ns *sns = mtod(nam, struct sockaddr_ns *); 221 222 nam->m_len = sizeof (*sns); 223 sns = mtod(nam, struct sockaddr_ns *); 224 bzero((caddr_t)sns, sizeof (*sns)); 225 sns->sns_len = sizeof(*sns); 226 sns->sns_family = AF_NS; 227 sns->sns_addr = nsp->nsp_laddr; 228 } 229 230 ns_setpeeraddr(nsp, nam) 231 register struct nspcb *nsp; 232 struct mbuf *nam; 233 { 234 register struct sockaddr_ns *sns = mtod(nam, struct sockaddr_ns *); 235 236 nam->m_len = sizeof (*sns); 237 sns = mtod(nam, struct sockaddr_ns *); 238 bzero((caddr_t)sns, sizeof (*sns)); 239 sns->sns_len = sizeof(*sns); 240 sns->sns_family = AF_NS; 241 sns->sns_addr = nsp->nsp_faddr; 242 } 243 244 /* 245 * Pass some notification to all connections of a protocol 246 * associated with address dst. Call the 247 * protocol specific routine to handle each connection. 248 * Also pass an extra paramter via the nspcb. (which may in fact 249 * be a parameter list!) 250 */ 251 ns_pcbnotify(dst, errno, notify, param) 252 register struct ns_addr *dst; 253 long param; 254 int errno, (*notify)(); 255 { 256 register struct nspcb *nsp, *oinp; 257 int s = splimp(); 258 259 for (nsp = (&nspcb)->nsp_next; nsp != (&nspcb);) { 260 if (!ns_hosteq(*dst,nsp->nsp_faddr)) { 261 next: 262 nsp = nsp->nsp_next; 263 continue; 264 } 265 if (nsp->nsp_socket == 0) 266 goto next; 267 if (errno) 268 nsp->nsp_socket->so_error = errno; 269 oinp = nsp; 270 nsp = nsp->nsp_next; 271 oinp->nsp_notify_param = param; 272 (*notify)(oinp); 273 } 274 splx(s); 275 } 276 277 #ifdef notdef 278 /* 279 * After a routing change, flush old routing 280 * and allocate a (hopefully) better one. 281 */ 282 ns_rtchange(nsp) 283 struct nspcb *nsp; 284 { 285 if (nsp->nsp_route.ro_rt) { 286 rtfree(nsp->nsp_route.ro_rt); 287 nsp->nsp_route.ro_rt = 0; 288 /* 289 * A new route can be allocated the next time 290 * output is attempted. 291 */ 292 } 293 /* SHOULD NOTIFY HIGHER-LEVEL PROTOCOLS */ 294 } 295 #endif 296 297 struct nspcb * 298 ns_pcblookup(faddr, lport, wildp) 299 struct ns_addr *faddr; 300 u_short lport; 301 { 302 register struct nspcb *nsp, *match = 0; 303 int matchwild = 3, wildcard; 304 u_short fport; 305 306 fport = faddr->x_port; 307 for (nsp = (&nspcb)->nsp_next; nsp != (&nspcb); nsp = nsp->nsp_next) { 308 if (nsp->nsp_lport != lport) 309 continue; 310 wildcard = 0; 311 if (ns_nullhost(nsp->nsp_faddr)) { 312 if (!ns_nullhost(*faddr)) 313 wildcard++; 314 } else { 315 if (ns_nullhost(*faddr)) 316 wildcard++; 317 else { 318 if (!ns_hosteq(nsp->nsp_faddr, *faddr)) 319 continue; 320 if (nsp->nsp_fport != fport) { 321 if (nsp->nsp_fport != 0) 322 continue; 323 else 324 wildcard++; 325 } 326 } 327 } 328 if (wildcard && wildp==0) 329 continue; 330 if (wildcard < matchwild) { 331 match = nsp; 332 matchwild = wildcard; 333 if (wildcard == 0) 334 break; 335 } 336 } 337 return (match); 338 } 339