1 /* 2 * Copyright (c) 1982, 1986, 1991 Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 * 7 * @(#)in_pcb.c 7.20 (Berkeley) 07/18/92 8 */ 9 10 #include "param.h" 11 #include "systm.h" 12 #include "malloc.h" 13 #include "mbuf.h" 14 #include "protosw.h" 15 #include "socket.h" 16 #include "socketvar.h" 17 #include "ioctl.h" 18 #include "errno.h" 19 20 #include "../net/if.h" 21 #include "../net/route.h" 22 23 #include "in.h" 24 #include "in_systm.h" 25 #include "ip.h" 26 #include "in_pcb.h" 27 #include "in_var.h" 28 29 #ifdef MULTICAST 30 #include "ip_var.h" 31 #endif 32 33 struct in_addr zeroin_addr; 34 35 in_pcballoc(so, head) 36 struct socket *so; 37 struct inpcb *head; 38 { 39 struct mbuf *m; 40 register struct inpcb *inp; 41 42 MALLOC(inp, struct inpcb *, sizeof(*inp), M_PCB, M_WAITOK); 43 if (inp == NULL) 44 return (ENOBUFS); 45 bzero((caddr_t)inp, sizeof(*inp)); 46 inp->inp_head = head; 47 inp->inp_socket = so; 48 insque(inp, head); 49 so->so_pcb = (caddr_t)inp; 50 return (0); 51 } 52 53 in_pcbbind(inp, nam) 54 register struct inpcb *inp; 55 struct mbuf *nam; 56 { 57 register struct socket *so = inp->inp_socket; 58 register struct inpcb *head = inp->inp_head; 59 register struct sockaddr_in *sin; 60 u_short lport = 0; 61 62 if (in_ifaddr == 0) 63 return (EADDRNOTAVAIL); 64 if (inp->inp_lport || inp->inp_laddr.s_addr != INADDR_ANY) 65 return (EINVAL); 66 if (nam == 0) 67 goto noname; 68 sin = mtod(nam, struct sockaddr_in *); 69 if (nam->m_len != sizeof (*sin)) 70 return (EINVAL); 71 if (sin->sin_addr.s_addr != INADDR_ANY) { 72 int tport = sin->sin_port; 73 74 sin->sin_port = 0; /* yech... */ 75 if (ifa_ifwithaddr((struct sockaddr *)sin) == 0) 76 return (EADDRNOTAVAIL); 77 sin->sin_port = tport; 78 } 79 lport = sin->sin_port; 80 if (lport) { 81 struct inpcb *t; 82 u_short aport = ntohs(lport); 83 int wild = 0; 84 85 /* GROSS */ 86 if (aport < IPPORT_RESERVED && (so->so_state & SS_PRIV) == 0) 87 return (EACCES); 88 /* even GROSSER, but this is the Internet */ 89 if ((so->so_options & SO_REUSEADDR) == 0 && 90 ((so->so_proto->pr_flags & PR_CONNREQUIRED) == 0 || 91 (so->so_options & SO_ACCEPTCONN) == 0)) 92 wild = INPLOOKUP_WILDCARD; 93 t = in_pcblookup(head, zeroin_addr, 0, 94 sin->sin_addr, lport, wild)) 95 if (t && !((so->so_options & t->inp_socket->so_options) & 96 SO_REUSEPORT)) 97 return (EADDRINUSE); 98 } 99 inp->inp_laddr = sin->sin_addr; 100 noname: 101 if (lport == 0) 102 do { 103 if (head->inp_lport++ < IPPORT_RESERVED || 104 head->inp_lport > IPPORT_USERRESERVED) 105 head->inp_lport = IPPORT_RESERVED; 106 lport = htons(head->inp_lport); 107 } while (in_pcblookup(head, 108 zeroin_addr, 0, inp->inp_laddr, lport, 0)); 109 inp->inp_lport = lport; 110 return (0); 111 } 112 113 /* 114 * Connect from a socket to a specified address. 115 * Both address and port must be specified in argument sin. 116 * If don't have a local address for this socket yet, 117 * then pick one. 118 */ 119 in_pcbconnect(inp, nam) 120 register struct inpcb *inp; 121 struct mbuf *nam; 122 { 123 struct in_ifaddr *ia; 124 struct sockaddr_in *ifaddr; 125 register struct sockaddr_in *sin = mtod(nam, struct sockaddr_in *); 126 127 if (nam->m_len != sizeof (*sin)) 128 return (EINVAL); 129 if (sin->sin_family != AF_INET) 130 return (EAFNOSUPPORT); 131 if (sin->sin_port == 0) 132 return (EADDRNOTAVAIL); 133 if (in_ifaddr) { 134 /* 135 * If the destination address is INADDR_ANY, 136 * use the primary local address. 137 * If the supplied address is INADDR_BROADCAST, 138 * and the primary interface supports broadcast, 139 * choose the broadcast address for that interface. 140 */ 141 #define satosin(sa) ((struct sockaddr_in *)(sa)) 142 if (sin->sin_addr.s_addr == INADDR_ANY) 143 sin->sin_addr = IA_SIN(in_ifaddr)->sin_addr; 144 else if (sin->sin_addr.s_addr == (u_long)INADDR_BROADCAST && 145 (in_ifaddr->ia_ifp->if_flags & IFF_BROADCAST)) 146 sin->sin_addr = satosin(&in_ifaddr->ia_broadaddr)->sin_addr; 147 } 148 if (inp->inp_laddr.s_addr == INADDR_ANY) { 149 register struct route *ro; 150 struct ifnet *ifp; 151 152 ia = (struct in_ifaddr *)0; 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 ro = &inp->inp_route; 158 if (ro->ro_rt && 159 (satosin(&ro->ro_dst)->sin_addr.s_addr != 160 sin->sin_addr.s_addr || 161 inp->inp_socket->so_options & SO_DONTROUTE)) { 162 RTFREE(ro->ro_rt); 163 ro->ro_rt = (struct rtentry *)0; 164 } 165 if ((inp->inp_socket->so_options & SO_DONTROUTE) == 0 && /*XXX*/ 166 (ro->ro_rt == (struct rtentry *)0 || 167 ro->ro_rt->rt_ifp == (struct ifnet *)0)) { 168 /* No route yet, so try to acquire one */ 169 ro->ro_dst.sa_family = AF_INET; 170 ro->ro_dst.sa_len = sizeof(struct sockaddr_in); 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 (ia = (struct in_ifaddr *)ro->ro_rt->rt_ifa) == 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 #ifdef MULTICAST 202 /* 203 * If the destination address is multicast and an outgoing 204 * interface has been set as a multicast option, use the 205 * address of that interface as our source address. 206 */ 207 if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr)) && 208 inp->inp_moptions != NULL) { 209 struct ip_moptions *imo; 210 211 imo = inp->inp_moptions; 212 if (imo->imo_multicast_ifp != NULL) { 213 ifp = imo->imo_multicast_ifp; 214 for (ia = in_ifaddr; ia; ia = ia->ia_next) 215 if (ia->ia_ifp == ifp) 216 break; 217 if (ia == 0) 218 return (EADDRNOTAVAIL); 219 } 220 } 221 #endif 222 ifaddr = (struct sockaddr_in *)&ia->ia_addr; 223 } 224 if (in_pcblookup(inp->inp_head, 225 sin->sin_addr, 226 sin->sin_port, 227 inp->inp_laddr.s_addr ? inp->inp_laddr : ifaddr->sin_addr, 228 inp->inp_lport, 229 0)) 230 return (EADDRINUSE); 231 if (inp->inp_laddr.s_addr == INADDR_ANY) { 232 if (inp->inp_lport == 0) 233 (void)in_pcbbind(inp, (struct mbuf *)0); 234 inp->inp_laddr = ifaddr->sin_addr; 235 } 236 inp->inp_faddr = sin->sin_addr; 237 inp->inp_fport = sin->sin_port; 238 return (0); 239 } 240 241 in_pcbdisconnect(inp) 242 struct inpcb *inp; 243 { 244 245 inp->inp_faddr.s_addr = INADDR_ANY; 246 inp->inp_fport = 0; 247 if (inp->inp_socket->so_state & SS_NOFDREF) 248 in_pcbdetach(inp); 249 } 250 251 in_pcbdetach(inp) 252 struct inpcb *inp; 253 { 254 struct socket *so = inp->inp_socket; 255 256 so->so_pcb = 0; 257 sofree(so); 258 if (inp->inp_options) 259 (void)m_free(inp->inp_options); 260 if (inp->inp_route.ro_rt) 261 rtfree(inp->inp_route.ro_rt); 262 #ifdef MULTICAST 263 ip_freemoptions(inp->inp_moptions); 264 #endif 265 remque(inp); 266 FREE(inp, M_PCB); 267 } 268 269 in_setsockaddr(inp, nam) 270 register struct inpcb *inp; 271 struct mbuf *nam; 272 { 273 register struct sockaddr_in *sin; 274 275 nam->m_len = sizeof (*sin); 276 sin = mtod(nam, struct sockaddr_in *); 277 bzero((caddr_t)sin, sizeof (*sin)); 278 sin->sin_family = AF_INET; 279 sin->sin_len = sizeof(*sin); 280 sin->sin_port = inp->inp_lport; 281 sin->sin_addr = inp->inp_laddr; 282 } 283 284 in_setpeeraddr(inp, nam) 285 struct inpcb *inp; 286 struct mbuf *nam; 287 { 288 register struct sockaddr_in *sin; 289 290 nam->m_len = sizeof (*sin); 291 sin = mtod(nam, struct sockaddr_in *); 292 bzero((caddr_t)sin, sizeof (*sin)); 293 sin->sin_family = AF_INET; 294 sin->sin_len = sizeof(*sin); 295 sin->sin_port = inp->inp_fport; 296 sin->sin_addr = inp->inp_faddr; 297 } 298 299 /* 300 * Pass some notification to all connections of a protocol 301 * associated with address dst. The local address and/or port numbers 302 * may be specified to limit the search. The "usual action" will be 303 * taken, depending on the ctlinput cmd. The caller must filter any 304 * cmds that are uninteresting (e.g., no error in the map). 305 * Call the protocol specific routine (if any) to report 306 * any errors for each matching socket. 307 * 308 * Must be called at splnet. 309 */ 310 in_pcbnotify(head, dst, fport, laddr, lport, cmd, notify) 311 struct inpcb *head; 312 struct sockaddr *dst; 313 u_short fport, lport; 314 struct in_addr laddr; 315 int cmd, (*notify)(); 316 { 317 register struct inpcb *inp, *oinp; 318 struct in_addr faddr; 319 int errno; 320 int in_rtchange(); 321 extern u_char inetctlerrmap[]; 322 323 if ((unsigned)cmd > PRC_NCMDS || dst->sa_family != AF_INET) 324 return; 325 faddr = ((struct sockaddr_in *)dst)->sin_addr; 326 if (faddr.s_addr == INADDR_ANY) 327 return; 328 329 /* 330 * Redirects go to all references to the destination, 331 * and use in_rtchange to invalidate the route cache. 332 * Dead host indications: notify all references to the destination. 333 * Otherwise, if we have knowledge of the local port and address, 334 * deliver only to that socket. 335 */ 336 if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) { 337 fport = 0; 338 lport = 0; 339 laddr.s_addr = 0; 340 if (cmd != PRC_HOSTDEAD) 341 notify = in_rtchange; 342 } 343 errno = inetctlerrmap[cmd]; 344 for (inp = head->inp_next; inp != head;) { 345 if (inp->inp_faddr.s_addr != faddr.s_addr || 346 inp->inp_socket == 0 || 347 (lport && inp->inp_lport != lport) || 348 (laddr.s_addr && inp->inp_laddr.s_addr != laddr.s_addr) || 349 (fport && inp->inp_fport != fport)) { 350 inp = inp->inp_next; 351 continue; 352 } 353 oinp = inp; 354 inp = inp->inp_next; 355 if (notify) 356 (*notify)(oinp, errno); 357 } 358 } 359 360 /* 361 * Check for alternatives when higher level complains 362 * about service problems. For now, invalidate cached 363 * routing information. If the route was created dynamically 364 * (by a redirect), time to try a default gateway again. 365 */ 366 in_losing(inp) 367 struct inpcb *inp; 368 { 369 register struct rtentry *rt; 370 struct rt_addrinfo info; 371 372 if ((rt = inp->inp_route.ro_rt)) { 373 bzero((caddr_t)&info, sizeof(info)); 374 info.rti_info[RTAX_DST] = 375 (struct sockaddr *)&inp->inp_route.ro_dst; 376 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 377 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 378 rt_missmsg(RTM_LOSING, &info, rt->rt_flags, 0); 379 if (rt->rt_flags & RTF_DYNAMIC) 380 (void) rtrequest(RTM_DELETE, rt_key(rt), 381 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 382 (struct rtentry **)0); 383 inp->inp_route.ro_rt = 0; 384 rtfree(rt); 385 /* 386 * A new route can be allocated 387 * the next time output is attempted. 388 */ 389 } 390 } 391 392 /* 393 * After a routing change, flush old routing 394 * and allocate a (hopefully) better one. 395 */ 396 in_rtchange(inp) 397 register struct inpcb *inp; 398 { 399 if (inp->inp_route.ro_rt) { 400 rtfree(inp->inp_route.ro_rt); 401 inp->inp_route.ro_rt = 0; 402 /* 403 * A new route can be allocated the next time 404 * output is attempted. 405 */ 406 } 407 } 408 409 struct inpcb * 410 in_pcblookup(head, faddr, fport, laddr, lport, flags) 411 struct inpcb *head; 412 struct in_addr faddr, laddr; 413 u_short fport, lport; 414 int flags; 415 { 416 register struct inpcb *inp, *match = 0; 417 int matchwild = 3, wildcard; 418 419 for (inp = head->inp_next; inp != head; inp = inp->inp_next) { 420 if (inp->inp_lport != lport) 421 continue; 422 wildcard = 0; 423 if (inp->inp_laddr.s_addr != INADDR_ANY) { 424 if (laddr.s_addr == INADDR_ANY) 425 wildcard++; 426 else if (inp->inp_laddr.s_addr != laddr.s_addr) 427 continue; 428 } else { 429 if (laddr.s_addr != INADDR_ANY) 430 wildcard++; 431 } 432 if (inp->inp_faddr.s_addr != INADDR_ANY) { 433 if (faddr.s_addr == INADDR_ANY) 434 wildcard++; 435 else if (inp->inp_faddr.s_addr != faddr.s_addr || 436 inp->inp_fport != fport) 437 continue; 438 } else { 439 if (faddr.s_addr != INADDR_ANY) 440 wildcard++; 441 } 442 if (wildcard && (flags & INPLOOKUP_WILDCARD) == 0) 443 continue; 444 if (wildcard < matchwild) { 445 match = inp; 446 matchwild = wildcard; 447 if (matchwild == 0) 448 break; 449 } 450 } 451 return (match); 452 } 453