1 /* 2 * Copyright (c) 1982, 1986 Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms are permitted 6 * provided that the above copyright notice and this paragraph are 7 * duplicated in all such forms and that any documentation, 8 * advertising materials, and other materials related to such 9 * distribution and use acknowledge that the software was developed 10 * by the University of California, Berkeley. The name of the 11 * University may not be used to endorse or promote products derived 12 * from this software without specific prior written permission. 13 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 14 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 15 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 16 * 17 * @(#)in_pcb.c 7.9 (Berkeley) 04/22/89 18 */ 19 20 #include "param.h" 21 #include "systm.h" 22 #include "dir.h" 23 #include "user.h" 24 #include "malloc.h" 25 #include "mbuf.h" 26 #include "socket.h" 27 #include "socketvar.h" 28 #include "ioctl.h" 29 #include "in.h" 30 #include "in_systm.h" 31 #include "../net/if.h" 32 #include "../net/route.h" 33 #include "in_pcb.h" 34 #include "in_var.h" 35 #include "protosw.h" 36 37 struct in_addr zeroin_addr; 38 39 in_pcballoc(so, head) 40 struct socket *so; 41 struct inpcb *head; 42 { 43 struct mbuf *m; 44 register struct inpcb *inp; 45 46 m = m_getclr(M_DONTWAIT, MT_PCB); 47 if (m == NULL) 48 return (ENOBUFS); 49 inp = mtod(m, struct inpcb *); 50 inp->inp_head = head; 51 inp->inp_socket = so; 52 insque(inp, head); 53 so->so_pcb = (caddr_t)inp; 54 return (0); 55 } 56 57 in_pcbbind(inp, nam) 58 register struct inpcb *inp; 59 struct mbuf *nam; 60 { 61 register struct socket *so = inp->inp_socket; 62 register struct inpcb *head = inp->inp_head; 63 register struct sockaddr_in *sin; 64 u_short lport = 0; 65 66 if (in_ifaddr == 0) 67 return (EADDRNOTAVAIL); 68 if (inp->inp_lport || inp->inp_laddr.s_addr != INADDR_ANY) 69 return (EINVAL); 70 if (nam == 0) 71 goto noname; 72 sin = mtod(nam, struct sockaddr_in *); 73 if (nam->m_len != sizeof (*sin)) 74 return (EINVAL); 75 if (sin->sin_addr.s_addr != INADDR_ANY) { 76 int tport = sin->sin_port; 77 78 sin->sin_port = 0; /* yech... */ 79 if (ifa_ifwithaddr((struct sockaddr *)sin) == 0) 80 return (EADDRNOTAVAIL); 81 sin->sin_port = tport; 82 } 83 lport = sin->sin_port; 84 if (lport) { 85 u_short aport = ntohs(lport); 86 int wild = 0; 87 88 /* GROSS */ 89 if (aport < IPPORT_RESERVED && u.u_uid != 0) 90 return (EACCES); 91 /* even GROSSER, but this is the Internet */ 92 if ((so->so_options & SO_REUSEADDR) == 0 && 93 ((so->so_proto->pr_flags & PR_CONNREQUIRED) == 0 || 94 (so->so_options & SO_ACCEPTCONN) == 0)) 95 wild = INPLOOKUP_WILDCARD; 96 if (in_pcblookup(head, 97 zeroin_addr, 0, sin->sin_addr, lport, wild)) 98 return (EADDRINUSE); 99 } 100 inp->inp_laddr = sin->sin_addr; 101 noname: 102 if (lport == 0) 103 do { 104 if (head->inp_lport++ < IPPORT_RESERVED || 105 head->inp_lport > IPPORT_USERRESERVED) 106 head->inp_lport = IPPORT_RESERVED; 107 lport = htons(head->inp_lport); 108 } while (in_pcblookup(head, 109 zeroin_addr, 0, inp->inp_laddr, lport, 0)); 110 inp->inp_lport = lport; 111 return (0); 112 } 113 114 /* 115 * Connect from a socket to a specified address. 116 * Both address and port must be specified in argument sin. 117 * If don't have a local address for this socket yet, 118 * then pick one. 119 */ 120 in_pcbconnect(inp, nam) 121 register struct inpcb *inp; 122 struct mbuf *nam; 123 { 124 struct in_ifaddr *ia; 125 struct sockaddr_in *ifaddr; 126 register struct sockaddr_in *sin = mtod(nam, struct sockaddr_in *); 127 128 if (nam->m_len != sizeof (*sin)) 129 return (EINVAL); 130 if (sin->sin_family != AF_INET) 131 return (EAFNOSUPPORT); 132 if (sin->sin_port == 0) 133 return (EADDRNOTAVAIL); 134 if (in_ifaddr) { 135 /* 136 * If the destination address is INADDR_ANY, 137 * use the primary local address. 138 * If the supplied address is INADDR_BROADCAST, 139 * and the primary interface supports broadcast, 140 * choose the broadcast address for that interface. 141 */ 142 #define satosin(sa) ((struct sockaddr_in *)(sa)) 143 if (sin->sin_addr.s_addr == INADDR_ANY) 144 sin->sin_addr = IA_SIN(in_ifaddr)->sin_addr; 145 else if (sin->sin_addr.s_addr == (u_long)INADDR_BROADCAST && 146 (in_ifaddr->ia_ifp->if_flags & IFF_BROADCAST)) 147 sin->sin_addr = satosin(&in_ifaddr->ia_broadaddr)->sin_addr; 148 } 149 if (inp->inp_laddr.s_addr == INADDR_ANY) { 150 register struct route *ro; 151 struct ifnet *ifp; 152 153 ia = (struct in_ifaddr *)0; 154 /* 155 * If route is known or can be allocated now, 156 * our src addr is taken from the i/f, else punt. 157 */ 158 ro = &inp->inp_route; 159 if (ro->ro_rt && 160 (satosin(&ro->ro_dst)->sin_addr.s_addr != 161 sin->sin_addr.s_addr || 162 inp->inp_socket->so_options & SO_DONTROUTE)) { 163 RTFREE(ro->ro_rt); 164 ro->ro_rt = (struct rtentry *)0; 165 } 166 if ((inp->inp_socket->so_options & SO_DONTROUTE) == 0 && /*XXX*/ 167 (ro->ro_rt == (struct rtentry *)0 || 168 ro->ro_rt->rt_ifp == (struct ifnet *)0)) { 169 /* No route yet, so try to acquire one */ 170 ro->ro_dst.sa_family = AF_INET; 171 ro->ro_dst.sa_len = sizeof(struct sockaddr_in); 172 ((struct sockaddr_in *) &ro->ro_dst)->sin_addr = 173 sin->sin_addr; 174 rtalloc(ro); 175 } 176 /* 177 * If we found a route, use the address 178 * corresponding to the outgoing interface 179 * unless it is the loopback (in case a route 180 * to our address on another net goes to loopback). 181 */ 182 if (ro->ro_rt && (ifp = ro->ro_rt->rt_ifp) && 183 (ifp->if_flags & IFF_LOOPBACK) == 0) 184 for (ia = in_ifaddr; ia; ia = ia->ia_next) 185 if (ia->ia_ifp == ifp) 186 break; 187 if (ia == 0) { 188 int fport = sin->sin_port; 189 190 sin->sin_port = 0; 191 ia = (struct in_ifaddr *) 192 ifa_ifwithdstaddr((struct sockaddr *)sin); 193 sin->sin_port = fport; 194 if (ia == 0) 195 ia = in_iaonnetof(in_netof(sin->sin_addr)); 196 if (ia == 0) 197 ia = in_ifaddr; 198 if (ia == 0) 199 return (EADDRNOTAVAIL); 200 } 201 ifaddr = (struct sockaddr_in *)&ia->ia_addr; 202 } 203 if (in_pcblookup(inp->inp_head, 204 sin->sin_addr, 205 sin->sin_port, 206 inp->inp_laddr.s_addr ? inp->inp_laddr : ifaddr->sin_addr, 207 inp->inp_lport, 208 0)) 209 return (EADDRINUSE); 210 if (inp->inp_laddr.s_addr == INADDR_ANY) { 211 if (inp->inp_lport == 0) 212 (void)in_pcbbind(inp, (struct mbuf *)0); 213 inp->inp_laddr = ifaddr->sin_addr; 214 } 215 inp->inp_faddr = sin->sin_addr; 216 inp->inp_fport = sin->sin_port; 217 return (0); 218 } 219 220 in_pcbdisconnect(inp) 221 struct inpcb *inp; 222 { 223 224 inp->inp_faddr.s_addr = INADDR_ANY; 225 inp->inp_fport = 0; 226 if (inp->inp_socket->so_state & SS_NOFDREF) 227 in_pcbdetach(inp); 228 } 229 230 in_pcbdetach(inp) 231 struct inpcb *inp; 232 { 233 struct socket *so = inp->inp_socket; 234 235 so->so_pcb = 0; 236 sofree(so); 237 if (inp->inp_options) 238 (void)m_free(inp->inp_options); 239 if (inp->inp_route.ro_rt) 240 rtfree(inp->inp_route.ro_rt); 241 remque(inp); 242 (void) m_free(dtom(inp)); 243 } 244 245 in_setsockaddr(inp, nam) 246 register struct inpcb *inp; 247 struct mbuf *nam; 248 { 249 register struct sockaddr_in *sin; 250 251 nam->m_len = sizeof (*sin); 252 sin = mtod(nam, struct sockaddr_in *); 253 bzero((caddr_t)sin, sizeof (*sin)); 254 sin->sin_family = AF_INET; 255 sin->sin_len = sizeof(*sin); 256 sin->sin_port = inp->inp_lport; 257 sin->sin_addr = inp->inp_laddr; 258 } 259 260 in_setpeeraddr(inp, nam) 261 struct inpcb *inp; 262 struct mbuf *nam; 263 { 264 register struct sockaddr_in *sin; 265 266 nam->m_len = sizeof (*sin); 267 sin = mtod(nam, struct sockaddr_in *); 268 bzero((caddr_t)sin, sizeof (*sin)); 269 sin->sin_family = AF_INET; 270 sin->sin_len = sizeof(*sin); 271 sin->sin_port = inp->inp_fport; 272 sin->sin_addr = inp->inp_faddr; 273 } 274 275 /* 276 * Pass some notification to all connections of a protocol 277 * associated with address dst. Call the protocol specific 278 * routine (if any) to handle each connection. 279 */ 280 in_pcbnotify(head, dst, errno, notify) 281 struct inpcb *head; 282 register struct in_addr *dst; 283 int errno, (*notify)(); 284 { 285 register struct inpcb *inp, *oinp; 286 int s = splimp(); 287 288 for (inp = head->inp_next; inp != head;) { 289 if (inp->inp_faddr.s_addr != dst->s_addr || 290 inp->inp_socket == 0) { 291 inp = inp->inp_next; 292 continue; 293 } 294 if (errno) 295 inp->inp_socket->so_error = errno; 296 oinp = inp; 297 inp = inp->inp_next; 298 if (notify) 299 (*notify)(oinp); 300 } 301 splx(s); 302 } 303 304 /* 305 * Check for alternatives when higher level complains 306 * about service problems. For now, invalidate cached 307 * routing information. If the route was created dynamically 308 * (by a redirect), time to try a default gateway again. 309 */ 310 in_losing(inp) 311 struct inpcb *inp; 312 { 313 register struct rtentry *rt; 314 315 if ((rt = inp->inp_route.ro_rt)) { 316 rt_missmsg(RTM_LOSING, &inp->inp_route.ro_dst, 317 rt->rt_gateway, (struct sockaddr *)rt_mask(rt), 318 (struct sockaddr *)0, rt->rt_flags, 0); 319 if (rt->rt_flags & RTF_DYNAMIC) 320 (void) rtrequest(RTM_DELETE, rt_key(rt), 321 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 322 (struct rtentry **)0); 323 inp->inp_route.ro_rt = 0; 324 rtfree(rt); 325 /* 326 * A new route can be allocated 327 * the next time output is attempted. 328 */ 329 } 330 } 331 332 /* 333 * After a routing change, flush old routing 334 * and allocate a (hopefully) better one. 335 */ 336 in_rtchange(inp) 337 register struct inpcb *inp; 338 { 339 if (inp->inp_route.ro_rt) { 340 rtfree(inp->inp_route.ro_rt); 341 inp->inp_route.ro_rt = 0; 342 /* 343 * A new route can be allocated the next time 344 * output is attempted. 345 */ 346 } 347 } 348 349 struct inpcb * 350 in_pcblookup(head, faddr, fport, laddr, lport, flags) 351 struct inpcb *head; 352 struct in_addr faddr, laddr; 353 u_short fport, lport; 354 int flags; 355 { 356 register struct inpcb *inp, *match = 0; 357 int matchwild = 3, wildcard; 358 359 for (inp = head->inp_next; inp != head; inp = inp->inp_next) { 360 if (inp->inp_lport != lport) 361 continue; 362 wildcard = 0; 363 if (inp->inp_laddr.s_addr != INADDR_ANY) { 364 if (laddr.s_addr == INADDR_ANY) 365 wildcard++; 366 else if (inp->inp_laddr.s_addr != laddr.s_addr) 367 continue; 368 } else { 369 if (laddr.s_addr != INADDR_ANY) 370 wildcard++; 371 } 372 if (inp->inp_faddr.s_addr != INADDR_ANY) { 373 if (faddr.s_addr == INADDR_ANY) 374 wildcard++; 375 else if (inp->inp_faddr.s_addr != faddr.s_addr || 376 inp->inp_fport != fport) 377 continue; 378 } else { 379 if (faddr.s_addr != INADDR_ANY) 380 wildcard++; 381 } 382 if (wildcard && (flags & INPLOOKUP_WILDCARD) == 0) 383 continue; 384 if (wildcard < matchwild) { 385 match = inp; 386 matchwild = wildcard; 387 if (matchwild == 0) 388 break; 389 } 390 } 391 return (match); 392 } 393