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 7.26 (Berkeley) 04/07/93 8 */ 9 10 #include <sys/param.h> 11 #include <sys/systm.h> 12 #include <sys/malloc.h> 13 #include <sys/mbuf.h> 14 #include <sys/protosw.h> 15 #include <sys/socket.h> 16 #include <sys/socketvar.h> 17 #include <sys/ioctl.h> 18 #include <sys/errno.h> 19 20 #include <net/if.h> 21 #include <net/route.h> 22 23 #include <netinet/in.h> 24 #include <netinet/in_systm.h> 25 #include <netinet/ip.h> 26 #include <netinet/in_pcb.h> 27 #include <netinet/in_var.h> 28 29 #include <netinet/ip_var.h> 30 31 struct in_addr zeroin_addr; 32 33 in_pcballoc(so, head) 34 struct socket *so; 35 struct inpcb *head; 36 { 37 struct mbuf *m; 38 register struct inpcb *inp; 39 40 MALLOC(inp, struct inpcb *, sizeof(*inp), M_PCB, M_WAITOK); 41 if (inp == NULL) 42 return (ENOBUFS); 43 bzero((caddr_t)inp, sizeof(*inp)); 44 inp->inp_head = head; 45 inp->inp_socket = so; 46 insque(inp, head); 47 so->so_pcb = (caddr_t)inp; 48 return (0); 49 } 50 51 in_pcbbind(inp, nam) 52 register struct inpcb *inp; 53 struct mbuf *nam; 54 { 55 register struct socket *so = inp->inp_socket; 56 register struct inpcb *head = inp->inp_head; 57 register struct sockaddr_in *sin; 58 u_short lport = 0; 59 int wild = 0; 60 61 if (in_ifaddr == 0) 62 return (EADDRNOTAVAIL); 63 if (inp->inp_lport || inp->inp_laddr.s_addr != INADDR_ANY) 64 return (EINVAL); 65 if ((so->so_options & SO_REUSEADDR) == 0 && 66 ((so->so_proto->pr_flags & PR_CONNREQUIRED) == 0 || 67 (so->so_options & SO_ACCEPTCONN) == 0)) 68 wild = INPLOOKUP_WILDCARD; 69 if (nam == 0) 70 goto noname; 71 sin = mtod(nam, struct sockaddr_in *); 72 if (nam->m_len != sizeof (*sin)) 73 return (EINVAL); 74 if (sin->sin_addr.s_addr != INADDR_ANY) { 75 int tport = sin->sin_port; 76 77 sin->sin_port = 0; /* yech... */ 78 if (ifa_ifwithaddr((struct sockaddr *)sin) == 0) 79 return (EADDRNOTAVAIL); 80 sin->sin_port = tport; 81 } 82 lport = sin->sin_port; 83 if (lport) { 84 struct inpcb *t; 85 u_short aport = ntohs(lport); 86 87 /* GROSS */ 88 if (aport < IPPORT_RESERVED && (so->so_state & SS_PRIV) == 0) 89 return (EACCES); 90 t = in_pcblookup(head, zeroin_addr, 0, 91 sin->sin_addr, lport, wild); 92 if (t && !((so->so_options & t->inp_socket->so_options) & 93 SO_REUSEPORT)) 94 return (EADDRINUSE); 95 } 96 inp->inp_laddr = sin->sin_addr; 97 noname: 98 if (lport == 0) 99 do { 100 if (head->inp_lport++ < IPPORT_RESERVED || 101 head->inp_lport > IPPORT_USERRESERVED) 102 head->inp_lport = IPPORT_RESERVED; 103 lport = htons(head->inp_lport); 104 } while (in_pcblookup(head, 105 zeroin_addr, 0, inp->inp_laddr, lport, wild)); 106 inp->inp_lport = lport; 107 return (0); 108 } 109 110 /* 111 * Connect from a socket to a specified address. 112 * Both address and port must be specified in argument sin. 113 * If don't have a local address for this socket yet, 114 * then pick one. 115 */ 116 in_pcbconnect(inp, nam) 117 register struct inpcb *inp; 118 struct mbuf *nam; 119 { 120 struct in_ifaddr *ia; 121 struct sockaddr_in *ifaddr; 122 register struct sockaddr_in *sin = mtod(nam, struct sockaddr_in *); 123 124 if (nam->m_len != sizeof (*sin)) 125 return (EINVAL); 126 if (sin->sin_family != AF_INET) 127 return (EAFNOSUPPORT); 128 if (sin->sin_port == 0) 129 return (EADDRNOTAVAIL); 130 if (in_ifaddr) { 131 /* 132 * If the destination address is INADDR_ANY, 133 * use the primary local address. 134 * If the supplied address is INADDR_BROADCAST, 135 * and the primary interface supports broadcast, 136 * choose the broadcast address for that interface. 137 */ 138 #define satosin(sa) ((struct sockaddr_in *)(sa)) 139 #define sintosa(sin) ((struct sockaddr *)(sin)) 140 #define ifatoia(ifa) ((struct in_ifaddr *)(ifa)) 141 if (sin->sin_addr.s_addr == INADDR_ANY) 142 sin->sin_addr = IA_SIN(in_ifaddr)->sin_addr; 143 else if (sin->sin_addr.s_addr == (u_long)INADDR_BROADCAST && 144 (in_ifaddr->ia_ifp->if_flags & IFF_BROADCAST)) 145 sin->sin_addr = satosin(&in_ifaddr->ia_broadaddr)->sin_addr; 146 } 147 if (inp->inp_laddr.s_addr == INADDR_ANY) { 148 register struct route *ro; 149 150 ia = (struct in_ifaddr *)0; 151 /* 152 * If route is known or can be allocated now, 153 * our src addr is taken from the i/f, else punt. 154 */ 155 ro = &inp->inp_route; 156 if (ro->ro_rt && 157 (satosin(&ro->ro_dst)->sin_addr.s_addr != 158 sin->sin_addr.s_addr || 159 inp->inp_socket->so_options & SO_DONTROUTE)) { 160 RTFREE(ro->ro_rt); 161 ro->ro_rt = (struct rtentry *)0; 162 } 163 if ((inp->inp_socket->so_options & SO_DONTROUTE) == 0 && /*XXX*/ 164 (ro->ro_rt == (struct rtentry *)0 || 165 ro->ro_rt->rt_ifp == (struct ifnet *)0)) { 166 /* No route yet, so try to acquire one */ 167 ro->ro_dst.sa_family = AF_INET; 168 ro->ro_dst.sa_len = sizeof(struct sockaddr_in); 169 ((struct sockaddr_in *) &ro->ro_dst)->sin_addr = 170 sin->sin_addr; 171 rtalloc(ro); 172 } 173 /* 174 * If we found a route, use the address 175 * corresponding to the outgoing interface 176 * unless it is the loopback (in case a route 177 * to our address on another net goes to loopback). 178 */ 179 if (ro->ro_rt && !(ro->ro_rt->rt_ifp->if_flags & IFF_LOOPBACK)) 180 ia = ifatoia(ro->ro_rt->rt_ifa); 181 if (ia == 0) { 182 int fport = sin->sin_port; 183 184 sin->sin_port = 0; 185 ia = ifatoia(ifa_ifwithdstaddr(sintosa(sin))); 186 if (ia == 0) 187 ia = ifatoia(ifa_ifwithnet(sintosa(sin))); 188 sin->sin_port = fport; 189 if (ia == 0) 190 ia = in_ifaddr; 191 if (ia == 0) 192 return (EADDRNOTAVAIL); 193 } 194 /* 195 * If the destination address is multicast and an outgoing 196 * interface has been set as a multicast option, use the 197 * address of that interface as our source address. 198 */ 199 if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr)) && 200 inp->inp_moptions != NULL) { 201 struct ip_moptions *imo; 202 struct ifnet *ifp; 203 204 imo = inp->inp_moptions; 205 if (imo->imo_multicast_ifp != NULL) { 206 ifp = imo->imo_multicast_ifp; 207 for (ia = in_ifaddr; ia; ia = ia->ia_next) 208 if (ia->ia_ifp == ifp) 209 break; 210 if (ia == 0) 211 return (EADDRNOTAVAIL); 212 } 213 } 214 ifaddr = (struct sockaddr_in *)&ia->ia_addr; 215 } 216 if (in_pcblookup(inp->inp_head, 217 sin->sin_addr, 218 sin->sin_port, 219 inp->inp_laddr.s_addr ? inp->inp_laddr : ifaddr->sin_addr, 220 inp->inp_lport, 221 0)) 222 return (EADDRINUSE); 223 if (inp->inp_laddr.s_addr == INADDR_ANY) { 224 if (inp->inp_lport == 0) 225 (void)in_pcbbind(inp, (struct mbuf *)0); 226 inp->inp_laddr = ifaddr->sin_addr; 227 } 228 inp->inp_faddr = sin->sin_addr; 229 inp->inp_fport = sin->sin_port; 230 return (0); 231 } 232 233 in_pcbdisconnect(inp) 234 struct inpcb *inp; 235 { 236 237 inp->inp_faddr.s_addr = INADDR_ANY; 238 inp->inp_fport = 0; 239 if (inp->inp_socket->so_state & SS_NOFDREF) 240 in_pcbdetach(inp); 241 } 242 243 in_pcbdetach(inp) 244 struct inpcb *inp; 245 { 246 struct socket *so = inp->inp_socket; 247 248 so->so_pcb = 0; 249 sofree(so); 250 if (inp->inp_options) 251 (void)m_free(inp->inp_options); 252 if (inp->inp_route.ro_rt) 253 rtfree(inp->inp_route.ro_rt); 254 ip_freemoptions(inp->inp_moptions); 255 remque(inp); 256 FREE(inp, M_PCB); 257 } 258 259 in_setsockaddr(inp, nam) 260 register struct inpcb *inp; 261 struct mbuf *nam; 262 { 263 register struct sockaddr_in *sin; 264 265 nam->m_len = sizeof (*sin); 266 sin = mtod(nam, struct sockaddr_in *); 267 bzero((caddr_t)sin, sizeof (*sin)); 268 sin->sin_family = AF_INET; 269 sin->sin_len = sizeof(*sin); 270 sin->sin_port = inp->inp_lport; 271 sin->sin_addr = inp->inp_laddr; 272 } 273 274 in_setpeeraddr(inp, nam) 275 struct inpcb *inp; 276 struct mbuf *nam; 277 { 278 register struct sockaddr_in *sin; 279 280 nam->m_len = sizeof (*sin); 281 sin = mtod(nam, struct sockaddr_in *); 282 bzero((caddr_t)sin, sizeof (*sin)); 283 sin->sin_family = AF_INET; 284 sin->sin_len = sizeof(*sin); 285 sin->sin_port = inp->inp_fport; 286 sin->sin_addr = inp->inp_faddr; 287 } 288 289 /* 290 * Pass some notification to all connections of a protocol 291 * associated with address dst. The local address and/or port numbers 292 * may be specified to limit the search. The "usual action" will be 293 * taken, depending on the ctlinput cmd. The caller must filter any 294 * cmds that are uninteresting (e.g., no error in the map). 295 * Call the protocol specific routine (if any) to report 296 * any errors for each matching socket. 297 * 298 * Must be called at splnet. 299 */ 300 in_pcbnotify(head, dst, fport, laddr, lport, cmd, notify) 301 struct inpcb *head; 302 struct sockaddr *dst; 303 u_short fport, lport; 304 struct in_addr laddr; 305 int cmd, (*notify)(); 306 { 307 register struct inpcb *inp, *oinp; 308 struct in_addr faddr; 309 int errno; 310 int in_rtchange(); 311 extern u_char inetctlerrmap[]; 312 313 if ((unsigned)cmd > PRC_NCMDS || dst->sa_family != AF_INET) 314 return; 315 faddr = ((struct sockaddr_in *)dst)->sin_addr; 316 if (faddr.s_addr == INADDR_ANY) 317 return; 318 319 /* 320 * Redirects go to all references to the destination, 321 * and use in_rtchange to invalidate the route cache. 322 * Dead host indications: notify all references to the destination. 323 * Otherwise, if we have knowledge of the local port and address, 324 * deliver only to that socket. 325 */ 326 if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) { 327 fport = 0; 328 lport = 0; 329 laddr.s_addr = 0; 330 if (cmd != PRC_HOSTDEAD) 331 notify = in_rtchange; 332 } 333 errno = inetctlerrmap[cmd]; 334 for (inp = head->inp_next; inp != head;) { 335 if (inp->inp_faddr.s_addr != faddr.s_addr || 336 inp->inp_socket == 0 || 337 (lport && inp->inp_lport != lport) || 338 (laddr.s_addr && inp->inp_laddr.s_addr != laddr.s_addr) || 339 (fport && inp->inp_fport != fport)) { 340 inp = inp->inp_next; 341 continue; 342 } 343 oinp = inp; 344 inp = inp->inp_next; 345 if (notify) 346 (*notify)(oinp, errno); 347 } 348 } 349 350 /* 351 * Check for alternatives when higher level complains 352 * about service problems. For now, invalidate cached 353 * routing information. If the route was created dynamically 354 * (by a redirect), time to try a default gateway again. 355 */ 356 in_losing(inp) 357 struct inpcb *inp; 358 { 359 register struct rtentry *rt; 360 struct rt_addrinfo info; 361 362 if ((rt = inp->inp_route.ro_rt)) { 363 inp->inp_route.ro_rt = 0; 364 bzero((caddr_t)&info, sizeof(info)); 365 info.rti_info[RTAX_DST] = 366 (struct sockaddr *)&inp->inp_route.ro_dst; 367 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 368 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 369 rt_missmsg(RTM_LOSING, &info, rt->rt_flags, 0); 370 if (rt->rt_flags & RTF_DYNAMIC) 371 (void) rtrequest(RTM_DELETE, rt_key(rt), 372 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 373 (struct rtentry **)0); 374 else 375 /* 376 * A new route can be allocated 377 * the next time output is attempted. 378 */ 379 rtfree(rt); 380 } 381 } 382 383 /* 384 * After a routing change, flush old routing 385 * and allocate a (hopefully) better one. 386 */ 387 in_rtchange(inp) 388 register struct inpcb *inp; 389 { 390 if (inp->inp_route.ro_rt) { 391 rtfree(inp->inp_route.ro_rt); 392 inp->inp_route.ro_rt = 0; 393 /* 394 * A new route can be allocated the next time 395 * output is attempted. 396 */ 397 } 398 } 399 400 struct inpcb * 401 in_pcblookup(head, faddr, fport, laddr, lport, flags) 402 struct inpcb *head; 403 struct in_addr faddr, laddr; 404 u_short fport, lport; 405 int flags; 406 { 407 register struct inpcb *inp, *match = 0; 408 int matchwild = 3, wildcard; 409 410 for (inp = head->inp_next; inp != head; inp = inp->inp_next) { 411 if (inp->inp_lport != lport) 412 continue; 413 wildcard = 0; 414 if (inp->inp_laddr.s_addr != INADDR_ANY) { 415 if (laddr.s_addr == INADDR_ANY) 416 wildcard++; 417 else if (inp->inp_laddr.s_addr != laddr.s_addr) 418 continue; 419 } else { 420 if (laddr.s_addr != INADDR_ANY) 421 wildcard++; 422 } 423 if (inp->inp_faddr.s_addr != INADDR_ANY) { 424 if (faddr.s_addr == INADDR_ANY) 425 wildcard++; 426 else if (inp->inp_faddr.s_addr != faddr.s_addr || 427 inp->inp_fport != fport) 428 continue; 429 } else { 430 if (faddr.s_addr != INADDR_ANY) 431 wildcard++; 432 } 433 if (wildcard && (flags & INPLOOKUP_WILDCARD) == 0) 434 continue; 435 if (wildcard < matchwild) { 436 match = inp; 437 matchwild = wildcard; 438 if (matchwild == 0) 439 break; 440 } 441 } 442 return (match); 443 } 444