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 7.8 (Berkeley) 10/12/88 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 ((struct sockaddr_in *) &ro->ro_dst)->sin_addr = 172 sin->sin_addr; 173 rtalloc(ro); 174 } 175 /* 176 * If we found a route, use the address 177 * corresponding to the outgoing interface 178 * unless it is the loopback (in case a route 179 * to our address on another net goes to loopback). 180 */ 181 if (ro->ro_rt && (ifp = ro->ro_rt->rt_ifp) && 182 (ifp->if_flags & IFF_LOOPBACK) == 0) 183 for (ia = in_ifaddr; ia; ia = ia->ia_next) 184 if (ia->ia_ifp == ifp) 185 break; 186 if (ia == 0) { 187 int fport = sin->sin_port; 188 189 sin->sin_port = 0; 190 ia = (struct in_ifaddr *) 191 ifa_ifwithdstaddr((struct sockaddr *)sin); 192 sin->sin_port = fport; 193 if (ia == 0) 194 ia = in_iaonnetof(in_netof(sin->sin_addr)); 195 if (ia == 0) 196 ia = in_ifaddr; 197 if (ia == 0) 198 return (EADDRNOTAVAIL); 199 } 200 ifaddr = (struct sockaddr_in *)&ia->ia_addr; 201 } 202 if (in_pcblookup(inp->inp_head, 203 sin->sin_addr, 204 sin->sin_port, 205 inp->inp_laddr.s_addr ? inp->inp_laddr : ifaddr->sin_addr, 206 inp->inp_lport, 207 0)) 208 return (EADDRINUSE); 209 if (inp->inp_laddr.s_addr == INADDR_ANY) { 210 if (inp->inp_lport == 0) 211 (void)in_pcbbind(inp, (struct mbuf *)0); 212 inp->inp_laddr = ifaddr->sin_addr; 213 } 214 inp->inp_faddr = sin->sin_addr; 215 inp->inp_fport = sin->sin_port; 216 return (0); 217 } 218 219 in_pcbdisconnect(inp) 220 struct inpcb *inp; 221 { 222 223 inp->inp_faddr.s_addr = INADDR_ANY; 224 inp->inp_fport = 0; 225 if (inp->inp_socket->so_state & SS_NOFDREF) 226 in_pcbdetach(inp); 227 } 228 229 in_pcbdetach(inp) 230 struct inpcb *inp; 231 { 232 struct socket *so = inp->inp_socket; 233 234 so->so_pcb = 0; 235 sofree(so); 236 if (inp->inp_options) 237 (void)m_free(inp->inp_options); 238 if (inp->inp_route.ro_rt) 239 rtfree(inp->inp_route.ro_rt); 240 remque(inp); 241 (void) m_free(dtom(inp)); 242 } 243 244 in_setsockaddr(inp, nam) 245 register struct inpcb *inp; 246 struct mbuf *nam; 247 { 248 register struct sockaddr_in *sin; 249 250 nam->m_len = sizeof (*sin); 251 sin = mtod(nam, struct sockaddr_in *); 252 bzero((caddr_t)sin, sizeof (*sin)); 253 sin->sin_family = AF_INET; 254 sin->sin_port = inp->inp_lport; 255 sin->sin_addr = inp->inp_laddr; 256 } 257 258 in_setpeeraddr(inp, nam) 259 struct inpcb *inp; 260 struct mbuf *nam; 261 { 262 register struct sockaddr_in *sin; 263 264 nam->m_len = sizeof (*sin); 265 sin = mtod(nam, struct sockaddr_in *); 266 bzero((caddr_t)sin, sizeof (*sin)); 267 sin->sin_family = AF_INET; 268 sin->sin_port = inp->inp_fport; 269 sin->sin_addr = inp->inp_faddr; 270 } 271 272 /* 273 * Pass some notification to all connections of a protocol 274 * associated with address dst. Call the protocol specific 275 * routine (if any) to handle each connection. 276 */ 277 in_pcbnotify(head, dst, errno, notify) 278 struct inpcb *head; 279 register struct in_addr *dst; 280 int errno, (*notify)(); 281 { 282 register struct inpcb *inp, *oinp; 283 int s = splimp(); 284 285 for (inp = head->inp_next; inp != head;) { 286 if (inp->inp_faddr.s_addr != dst->s_addr || 287 inp->inp_socket == 0) { 288 inp = inp->inp_next; 289 continue; 290 } 291 if (errno) 292 inp->inp_socket->so_error = errno; 293 oinp = inp; 294 inp = inp->inp_next; 295 if (notify) 296 (*notify)(oinp); 297 } 298 splx(s); 299 } 300 301 /* 302 * Check for alternatives when higher level complains 303 * about service problems. For now, invalidate cached 304 * routing information. If the route was created dynamically 305 * (by a redirect), time to try a default gateway again. 306 */ 307 in_losing(inp) 308 struct inpcb *inp; 309 { 310 register struct rtentry *rt; 311 312 if ((rt = inp->inp_route.ro_rt)) { 313 if (rt->rt_flags & RTF_DYNAMIC) 314 (void) rtrequest((int)SIOCDELRT, rt); 315 rtfree(rt); 316 inp->inp_route.ro_rt = 0; 317 /* 318 * A new route can be allocated 319 * the next time output is attempted. 320 */ 321 } 322 } 323 324 /* 325 * After a routing change, flush old routing 326 * and allocate a (hopefully) better one. 327 */ 328 in_rtchange(inp) 329 register struct inpcb *inp; 330 { 331 if (inp->inp_route.ro_rt) { 332 rtfree(inp->inp_route.ro_rt); 333 inp->inp_route.ro_rt = 0; 334 /* 335 * A new route can be allocated the next time 336 * output is attempted. 337 */ 338 } 339 } 340 341 struct inpcb * 342 in_pcblookup(head, faddr, fport, laddr, lport, flags) 343 struct inpcb *head; 344 struct in_addr faddr, laddr; 345 u_short fport, lport; 346 int flags; 347 { 348 register struct inpcb *inp, *match = 0; 349 int matchwild = 3, wildcard; 350 351 for (inp = head->inp_next; inp != head; inp = inp->inp_next) { 352 if (inp->inp_lport != lport) 353 continue; 354 wildcard = 0; 355 if (inp->inp_laddr.s_addr != INADDR_ANY) { 356 if (laddr.s_addr == INADDR_ANY) 357 wildcard++; 358 else if (inp->inp_laddr.s_addr != laddr.s_addr) 359 continue; 360 } else { 361 if (laddr.s_addr != INADDR_ANY) 362 wildcard++; 363 } 364 if (inp->inp_faddr.s_addr != INADDR_ANY) { 365 if (faddr.s_addr == INADDR_ANY) 366 wildcard++; 367 else if (inp->inp_faddr.s_addr != faddr.s_addr || 368 inp->inp_fport != fport) 369 continue; 370 } else { 371 if (faddr.s_addr != INADDR_ANY) 372 wildcard++; 373 } 374 if (wildcard && (flags & INPLOOKUP_WILDCARD) == 0) 375 continue; 376 if (wildcard < matchwild) { 377 match = inp; 378 matchwild = wildcard; 379 if (matchwild == 0) 380 break; 381 } 382 } 383 return (match); 384 } 385