1 /* 2 * Copyright (c) 1980, 1986 Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 * 7 * @(#)if.c 7.18 (Berkeley) 03/11/92 8 */ 9 10 #include "param.h" 11 #include "mbuf.h" 12 #include "systm.h" 13 #include "proc.h" 14 #include "socket.h" 15 #include "socketvar.h" 16 #include "protosw.h" 17 #include "kernel.h" 18 #include "ioctl.h" 19 20 #include "if.h" 21 #include "af.h" 22 #include "if_dl.h" 23 #include "if_types.h" 24 25 #include "ether.h" 26 27 int ifqmaxlen = IFQ_MAXLEN; 28 29 /* 30 * Network interface utility routines. 31 * 32 * Routines with ifa_ifwith* names take sockaddr *'s as 33 * parameters. 34 */ 35 36 ifinit() 37 { 38 register struct ifnet *ifp; 39 40 for (ifp = ifnet; ifp; ifp = ifp->if_next) 41 if (ifp->if_snd.ifq_maxlen == 0) 42 ifp->if_snd.ifq_maxlen = ifqmaxlen; 43 if_slowtimo(); 44 } 45 46 #ifdef vax 47 /* 48 * Call each interface on a Unibus reset. 49 */ 50 ifubareset(uban) 51 int uban; 52 { 53 register struct ifnet *ifp; 54 55 for (ifp = ifnet; ifp; ifp = ifp->if_next) 56 if (ifp->if_reset) 57 (*ifp->if_reset)(ifp->if_unit, uban); 58 } 59 #endif 60 61 int if_index = 0; 62 struct ifaddr **ifnet_addrs; 63 static char *sprint_d(); 64 65 /* 66 * Attach an interface to the 67 * list of "active" interfaces. 68 */ 69 void 70 if_attach(ifp) 71 struct ifnet *ifp; 72 { 73 unsigned socksize, ifasize; 74 int namelen, unitlen, masklen; 75 char workbuf[12], *unitname; 76 register struct ifnet **p = &ifnet; 77 register struct sockaddr_dl *sdl; 78 register struct ifaddr *ifa; 79 static int if_indexlim = 8; 80 extern link_rtrequest(), ether_output(); 81 82 while (*p) 83 p = &((*p)->if_next); 84 *p = ifp; 85 ifp->if_index = ++if_index; 86 if (ifnet_addrs == 0 || if_index >= if_indexlim) { 87 unsigned n = (if_indexlim <<= 1) * sizeof(ifa); 88 struct ifaddr **q = (struct ifaddr **) 89 malloc(n, M_IFADDR, M_WAITOK); 90 if (ifnet_addrs) { 91 bcopy((caddr_t)ifnet_addrs, (caddr_t)q, n/2); 92 free((caddr_t)ifnet_addrs, M_IFADDR); 93 } 94 ifnet_addrs = q; 95 } 96 /* 97 * create a Link Level name for this device 98 */ 99 unitname = sprint_d((u_int)ifp->if_unit, workbuf, sizeof(workbuf)); 100 namelen = strlen(ifp->if_name); 101 unitlen = strlen(unitname); 102 #define _offsetof(t, m) ((int)((caddr_t)&((t *)0)->m)) 103 masklen = _offsetof(struct sockaddr_dl, sdl_data[0]) + 104 unitlen + namelen; 105 socksize = masklen + ifp->if_addrlen; 106 #define ROUNDUP(a) (1 + (((a) - 1) | (sizeof(long) - 1))) 107 socksize = ROUNDUP(socksize); 108 if (socksize < sizeof(*sdl)) 109 socksize = sizeof(*sdl); 110 ifasize = sizeof(*ifa) + 2 * socksize; 111 if (ifa = (struct ifaddr *)malloc(ifasize, M_IFADDR, M_WAITOK)) { 112 bzero((caddr_t)ifa, ifasize); 113 sdl = (struct sockaddr_dl *)(ifa + 1); 114 sdl->sdl_len = socksize; 115 sdl->sdl_family = AF_LINK; 116 bcopy(ifp->if_name, sdl->sdl_data, namelen); 117 bcopy(unitname, namelen + (caddr_t)sdl->sdl_data, unitlen); 118 sdl->sdl_nlen = (namelen += unitlen); 119 sdl->sdl_index = ifp->if_index; 120 sdl->sdl_type = ifp->if_type; 121 ifnet_addrs[if_index - 1] = ifa; 122 ifa->ifa_ifp = ifp; 123 ifa->ifa_next = ifp->if_addrlist; 124 ifa->ifa_rtrequest = link_rtrequest; 125 ifp->if_addrlist = ifa; 126 ifa->ifa_addr = (struct sockaddr *)sdl; 127 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl); 128 ifa->ifa_netmask = (struct sockaddr *)sdl; 129 sdl->sdl_len = masklen; 130 while (namelen != 0) 131 sdl->sdl_data[--namelen] = 0xff; 132 } 133 /* XXX -- Temporary fix before changing 10 ethernet drivers */ 134 if (ifp->if_output == ether_output) 135 ether_ifattach(ifp); 136 } 137 /* 138 * Locate an interface based on a complete address. 139 */ 140 /*ARGSUSED*/ 141 struct ifaddr * 142 ifa_ifwithaddr(addr) 143 register struct sockaddr *addr; 144 { 145 register struct ifnet *ifp; 146 register struct ifaddr *ifa; 147 148 #define equal(a1, a2) \ 149 (bcmp((caddr_t)(a1), (caddr_t)(a2), ((struct sockaddr *)(a1))->sa_len) == 0) 150 for (ifp = ifnet; ifp; ifp = ifp->if_next) 151 for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next) { 152 if (ifa->ifa_addr->sa_family != addr->sa_family) 153 continue; 154 if (equal(addr, ifa->ifa_addr)) 155 return (ifa); 156 if ((ifp->if_flags & IFF_BROADCAST) && ifa->ifa_broadaddr && 157 equal(ifa->ifa_broadaddr, addr)) 158 return (ifa); 159 } 160 return ((struct ifaddr *)0); 161 } 162 /* 163 * Locate the point to point interface with a given destination address. 164 */ 165 /*ARGSUSED*/ 166 struct ifaddr * 167 ifa_ifwithdstaddr(addr) 168 register struct sockaddr *addr; 169 { 170 register struct ifnet *ifp; 171 register struct ifaddr *ifa; 172 173 for (ifp = ifnet; ifp; ifp = ifp->if_next) 174 if (ifp->if_flags & IFF_POINTOPOINT) 175 for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next) { 176 if (ifa->ifa_addr->sa_family != addr->sa_family) 177 continue; 178 if (equal(addr, ifa->ifa_dstaddr)) 179 return (ifa); 180 } 181 return ((struct ifaddr *)0); 182 } 183 184 /* 185 * Find an interface on a specific network. If many, choice 186 * is first found. 187 */ 188 struct ifaddr * 189 ifa_ifwithnet(addr) 190 struct sockaddr *addr; 191 { 192 register struct ifnet *ifp; 193 register struct ifaddr *ifa; 194 u_int af = addr->sa_family; 195 196 if (af >= AF_MAX) 197 return (0); 198 if (af == AF_LINK) { 199 register struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr; 200 if (sdl->sdl_index && sdl->sdl_index <= if_index) 201 return (ifnet_addrs[sdl->sdl_index - 1]); 202 } 203 for (ifp = ifnet; ifp; ifp = ifp->if_next) 204 for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next) { 205 register char *cp, *cp2, *cp3; 206 register char *cplim; 207 if (ifa->ifa_addr->sa_family != af || ifa->ifa_netmask == 0) 208 continue; 209 cp = addr->sa_data; 210 cp2 = ifa->ifa_addr->sa_data; 211 cp3 = ifa->ifa_netmask->sa_data; 212 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; 213 for (; cp3 < cplim; cp3++) 214 if ((*cp++ ^ *cp2++) & *cp3) 215 break; 216 if (cp3 == cplim) 217 return (ifa); 218 } 219 return ((struct ifaddr *)0); 220 } 221 222 /* 223 * Find an interface using a specific address family 224 */ 225 struct ifaddr * 226 ifa_ifwithaf(af) 227 register int af; 228 { 229 register struct ifnet *ifp; 230 register struct ifaddr *ifa; 231 232 for (ifp = ifnet; ifp; ifp = ifp->if_next) 233 for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next) 234 if (ifa->ifa_addr->sa_family == af) 235 return (ifa); 236 return ((struct ifaddr *)0); 237 } 238 239 /* 240 * Find an interface address specific to an interface best matching 241 * a given address. 242 */ 243 struct ifaddr * 244 ifaof_ifpforaddr(addr, ifp) 245 struct sockaddr *addr; 246 register struct ifnet *ifp; 247 { 248 register struct ifaddr *ifa; 249 register char *cp, *cp2, *cp3; 250 register char *cplim; 251 struct ifaddr *ifa_maybe = 0; 252 u_int af = addr->sa_family; 253 254 if (af >= AF_MAX) 255 return (0); 256 for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next) { 257 if (ifa->ifa_addr->sa_family != af) 258 continue; 259 ifa_maybe = ifa; 260 if (ifa->ifa_netmask == 0) { 261 if (equal(addr, ifa->ifa_addr) || 262 (ifa->ifa_dstaddr && equal(addr, ifa->ifa_dstaddr))) 263 return (ifa); 264 continue; 265 } 266 cp = addr->sa_data; 267 cp2 = ifa->ifa_addr->sa_data; 268 cp3 = ifa->ifa_netmask->sa_data; 269 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; 270 for (; cp3 < cplim; cp3++) 271 if ((*cp++ ^ *cp2++) & *cp3) 272 break; 273 if (cp3 == cplim) 274 return (ifa); 275 } 276 return (ifa_maybe); 277 } 278 #include "route.h" 279 /* 280 * Default action when installing a route with a Link Level gateway. 281 * Lookup an appropriate real ifa to point to. 282 * This should be moved to /sys/net/link.c eventually. 283 */ 284 link_rtrequest(cmd, rt, sa) 285 int cmd; 286 register struct rtentry *rt; 287 struct sockaddr *sa; 288 { 289 register struct ifaddr *ifa; 290 struct sockaddr *dst; 291 struct ifnet *ifp, *oldifnet = ifnet; 292 293 if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == 0) || 294 ((ifp = ifa->ifa_ifp) == 0) || ((dst = rt_key(rt)) == 0)) 295 return; 296 if (ifa = ifaof_ifpforaddr(dst, ifp)) { 297 rt->rt_ifa = ifa; 298 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest) 299 ifa->ifa_rtrequest(cmd, rt, sa); 300 } 301 } 302 303 /* 304 * Mark an interface down and notify protocols of 305 * the transition. 306 * NOTE: must be called at splnet or eqivalent. 307 */ 308 if_down(ifp) 309 register struct ifnet *ifp; 310 { 311 register struct ifaddr *ifa; 312 313 ifp->if_flags &= ~IFF_UP; 314 for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next) 315 pfctlinput(PRC_IFDOWN, ifa->ifa_addr); 316 if_qflush(&ifp->if_snd); 317 rt_ifmsg(ifp); 318 } 319 320 /* 321 * Mark an interface up and notify protocols of 322 * the transition. 323 * NOTE: must be called at splnet or eqivalent. 324 */ 325 if_up(ifp) 326 register struct ifnet *ifp; 327 { 328 register struct ifaddr *ifa; 329 330 ifp->if_flags |= IFF_UP; 331 #ifdef notyet 332 /* this has no effect on IP, and will kill all iso connections XXX */ 333 for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next) 334 pfctlinput(PRC_IFUP, ifa->ifa_addr); 335 #endif notyet 336 rt_ifmsg(ifp); 337 } 338 339 /* 340 * Flush an interface queue. 341 */ 342 if_qflush(ifq) 343 register struct ifqueue *ifq; 344 { 345 register struct mbuf *m, *n; 346 347 n = ifq->ifq_head; 348 while (m = n) { 349 n = m->m_act; 350 m_freem(m); 351 } 352 ifq->ifq_head = 0; 353 ifq->ifq_tail = 0; 354 ifq->ifq_len = 0; 355 } 356 357 /* 358 * Handle interface watchdog timer routines. Called 359 * from softclock, we decrement timers (if set) and 360 * call the appropriate interface routine on expiration. 361 */ 362 if_slowtimo() 363 { 364 register struct ifnet *ifp; 365 int s = splimp(); 366 367 for (ifp = ifnet; ifp; ifp = ifp->if_next) { 368 if (ifp->if_timer == 0 || --ifp->if_timer) 369 continue; 370 if (ifp->if_watchdog) 371 (*ifp->if_watchdog)(ifp->if_unit); 372 } 373 splx(s); 374 timeout(if_slowtimo, (caddr_t)0, hz / IFNET_SLOWHZ); 375 } 376 377 /* 378 * Map interface name to 379 * interface structure pointer. 380 */ 381 struct ifnet * 382 ifunit(name) 383 register char *name; 384 { 385 register char *cp; 386 register struct ifnet *ifp; 387 int unit; 388 unsigned len; 389 char *ep, c; 390 391 for (cp = name; cp < name + IFNAMSIZ && *cp; cp++) 392 if (*cp >= '0' && *cp <= '9') 393 break; 394 if (*cp == '\0' || cp == name + IFNAMSIZ) 395 return ((struct ifnet *)0); 396 /* 397 * Save first char of unit, and pointer to it, 398 * so we can put a null there to avoid matching 399 * initial substrings of interface names. 400 */ 401 len = cp - name + 1; 402 c = *cp; 403 ep = cp; 404 for (unit = 0; *cp >= '0' && *cp <= '9'; ) 405 unit = unit * 10 + *cp++ - '0'; 406 *ep = 0; 407 for (ifp = ifnet; ifp; ifp = ifp->if_next) { 408 if (bcmp(ifp->if_name, name, len)) 409 continue; 410 if (unit == ifp->if_unit) 411 break; 412 } 413 *ep = c; 414 return (ifp); 415 } 416 417 /* 418 * Interface ioctls. 419 */ 420 ifioctl(so, cmd, data, p) 421 struct socket *so; 422 int cmd; 423 caddr_t data; 424 struct proc *p; 425 { 426 register struct ifnet *ifp; 427 register struct ifreq *ifr; 428 int error; 429 430 switch (cmd) { 431 432 case SIOCGIFCONF: 433 case OSIOCGIFCONF: 434 return (ifconf(cmd, data)); 435 436 #if defined(INET) && NETHER > 0 437 case SIOCSARP: 438 case SIOCDARP: 439 if (error = suser(p->p_ucred, &p->p_acflag)) 440 return (error); 441 /* FALL THROUGH */ 442 case SIOCGARP: 443 case OSIOCGARP: 444 return (arpioctl(cmd, data)); 445 #endif 446 } 447 ifr = (struct ifreq *)data; 448 ifp = ifunit(ifr->ifr_name); 449 if (ifp == 0) 450 return (ENXIO); 451 switch (cmd) { 452 453 case SIOCGIFFLAGS: 454 ifr->ifr_flags = ifp->if_flags; 455 break; 456 457 case SIOCGIFMETRIC: 458 ifr->ifr_metric = ifp->if_metric; 459 break; 460 461 case SIOCSIFFLAGS: 462 if (error = suser(p->p_ucred, &p->p_acflag)) 463 return (error); 464 if (ifp->if_flags & IFF_UP && (ifr->ifr_flags & IFF_UP) == 0) { 465 int s = splimp(); 466 if_down(ifp); 467 splx(s); 468 } 469 if (ifr->ifr_flags & IFF_UP && (ifp->if_flags & IFF_UP) == 0) { 470 int s = splimp(); 471 if_up(ifp); 472 splx(s); 473 } 474 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | 475 (ifr->ifr_flags &~ IFF_CANTCHANGE); 476 if (ifp->if_ioctl) 477 (void) (*ifp->if_ioctl)(ifp, cmd, data); 478 break; 479 480 case SIOCSIFMETRIC: 481 if (error = suser(p->p_ucred, &p->p_acflag)) 482 return (error); 483 ifp->if_metric = ifr->ifr_metric; 484 break; 485 486 default: 487 if (so->so_proto == 0) 488 return (EOPNOTSUPP); 489 #ifndef COMPAT_43 490 return ((*so->so_proto->pr_usrreq)(so, PRU_CONTROL, 491 cmd, data, ifp)); 492 #else 493 { 494 int ocmd = cmd; 495 496 switch (cmd) { 497 498 case SIOCSIFDSTADDR: 499 case SIOCSIFADDR: 500 case SIOCSIFBRDADDR: 501 case SIOCSIFNETMASK: 502 #if BYTE_ORDER != BIG_ENDIAN 503 if (ifr->ifr_addr.sa_family == 0 && 504 ifr->ifr_addr.sa_len < 16) { 505 ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len; 506 ifr->ifr_addr.sa_len = 16; 507 } 508 #else 509 if (ifr->ifr_addr.sa_len == 0) 510 ifr->ifr_addr.sa_len = 16; 511 #endif 512 break; 513 514 case OSIOCGIFADDR: 515 cmd = SIOCGIFADDR; 516 break; 517 518 case OSIOCGIFDSTADDR: 519 cmd = SIOCGIFDSTADDR; 520 break; 521 522 case OSIOCGIFBRDADDR: 523 cmd = SIOCGIFBRDADDR; 524 break; 525 526 case OSIOCGIFNETMASK: 527 cmd = SIOCGIFNETMASK; 528 } 529 error = ((*so->so_proto->pr_usrreq)(so, PRU_CONTROL, 530 cmd, data, ifp)); 531 switch (ocmd) { 532 533 case OSIOCGIFADDR: 534 case OSIOCGIFDSTADDR: 535 case OSIOCGIFBRDADDR: 536 case OSIOCGIFNETMASK: 537 *(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family; 538 } 539 return (error); 540 541 } 542 #endif 543 } 544 return (0); 545 } 546 547 /* 548 * Return interface configuration 549 * of system. List may be used 550 * in later ioctl's (above) to get 551 * other information. 552 */ 553 /*ARGSUSED*/ 554 ifconf(cmd, data) 555 int cmd; 556 caddr_t data; 557 { 558 register struct ifconf *ifc = (struct ifconf *)data; 559 register struct ifnet *ifp = ifnet; 560 register struct ifaddr *ifa; 561 register char *cp, *ep; 562 struct ifreq ifr, *ifrp; 563 int space = ifc->ifc_len, error = 0; 564 565 ifrp = ifc->ifc_req; 566 ep = ifr.ifr_name + sizeof (ifr.ifr_name) - 2; 567 for (; space > sizeof (ifr) && ifp; ifp = ifp->if_next) { 568 bcopy(ifp->if_name, ifr.ifr_name, sizeof (ifr.ifr_name) - 2); 569 for (cp = ifr.ifr_name; cp < ep && *cp; cp++) 570 continue; 571 *cp++ = '0' + ifp->if_unit; *cp = '\0'; 572 if ((ifa = ifp->if_addrlist) == 0) { 573 bzero((caddr_t)&ifr.ifr_addr, sizeof(ifr.ifr_addr)); 574 error = copyout((caddr_t)&ifr, (caddr_t)ifrp, sizeof (ifr)); 575 if (error) 576 break; 577 space -= sizeof (ifr), ifrp++; 578 } else 579 for ( ; space > sizeof (ifr) && ifa; ifa = ifa->ifa_next) { 580 register struct sockaddr *sa = ifa->ifa_addr; 581 #ifdef COMPAT_43 582 if (cmd == OSIOCGIFCONF) { 583 struct osockaddr *osa = 584 (struct osockaddr *)&ifr.ifr_addr; 585 ifr.ifr_addr = *sa; 586 osa->sa_family = sa->sa_family; 587 error = copyout((caddr_t)&ifr, (caddr_t)ifrp, 588 sizeof (ifr)); 589 ifrp++; 590 } else 591 #endif 592 if (sa->sa_len <= sizeof(*sa)) { 593 ifr.ifr_addr = *sa; 594 error = copyout((caddr_t)&ifr, (caddr_t)ifrp, 595 sizeof (ifr)); 596 ifrp++; 597 } else { 598 space -= sa->sa_len - sizeof(*sa); 599 if (space < sizeof (ifr)) 600 break; 601 error = copyout((caddr_t)&ifr, (caddr_t)ifrp, 602 sizeof (ifr.ifr_name)); 603 if (error == 0) 604 error = copyout((caddr_t)sa, 605 (caddr_t)&ifrp->ifr_addr, sa->sa_len); 606 ifrp = (struct ifreq *) 607 (sa->sa_len + (caddr_t)&ifrp->ifr_addr); 608 } 609 if (error) 610 break; 611 space -= sizeof (ifr); 612 } 613 } 614 ifc->ifc_len -= space; 615 return (error); 616 } 617 618 static char * 619 sprint_d(n, buf, buflen) 620 u_int n; 621 char *buf; 622 int buflen; 623 { 624 register char *cp = buf + buflen - 1; 625 626 *cp = 0; 627 do { 628 cp--; 629 *cp = "0123456789"[n % 10]; 630 n /= 10; 631 } while (n != 0); 632 return (cp); 633 } 634