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 7.20 (Berkeley) 07/06/92 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, ether_output(); 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 void link_rtrequest(); 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 most specific 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 struct ifaddr *ifa_maybe = (struct ifaddr *) 0; 195 u_int af = addr->sa_family; 196 char *addr_data = addr->sa_data, *cplim; 197 198 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; 206 207 if (ifa->ifa_addr->sa_family != af || ifa->ifa_netmask == 0) 208 next: continue; 209 cp = addr_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 while (cp3 < cplim) 214 if ((*cp++ ^ *cp2++) & *cp3++) 215 goto next; 216 if (ifa_maybe == 0 || 217 rn_refines(ifa->ifa_netmask, ifa_maybe->ifa_netmask)) 218 ifa_maybe = ifa; 219 } 220 return (ifa_maybe); 221 } 222 223 /* 224 * Find an interface using a specific address family 225 */ 226 struct ifaddr * 227 ifa_ifwithaf(af) 228 register int af; 229 { 230 register struct ifnet *ifp; 231 register struct ifaddr *ifa; 232 233 for (ifp = ifnet; ifp; ifp = ifp->if_next) 234 for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next) 235 if (ifa->ifa_addr->sa_family == af) 236 return (ifa); 237 return ((struct ifaddr *)0); 238 } 239 240 /* 241 * Find an interface address specific to an interface best matching 242 * a given address. 243 */ 244 struct ifaddr * 245 ifaof_ifpforaddr(addr, ifp) 246 struct sockaddr *addr; 247 register struct ifnet *ifp; 248 { 249 register struct ifaddr *ifa; 250 register char *cp, *cp2, *cp3; 251 register char *cplim; 252 struct ifaddr *ifa_maybe = 0; 253 u_int af = addr->sa_family; 254 255 if (af >= AF_MAX) 256 return (0); 257 for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next) { 258 if (ifa->ifa_addr->sa_family != af) 259 continue; 260 ifa_maybe = ifa; 261 if (ifa->ifa_netmask == 0) { 262 if (equal(addr, ifa->ifa_addr) || 263 (ifa->ifa_dstaddr && equal(addr, ifa->ifa_dstaddr))) 264 return (ifa); 265 continue; 266 } 267 cp = addr->sa_data; 268 cp2 = ifa->ifa_addr->sa_data; 269 cp3 = ifa->ifa_netmask->sa_data; 270 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; 271 for (; cp3 < cplim; cp3++) 272 if ((*cp++ ^ *cp2++) & *cp3) 273 break; 274 if (cp3 == cplim) 275 return (ifa); 276 } 277 return (ifa_maybe); 278 } 279 #include "route.h" 280 /* 281 * Default action when installing a route with a Link Level gateway. 282 * Lookup an appropriate real ifa to point to. 283 * This should be moved to /sys/net/link.c eventually. 284 */ 285 void 286 link_rtrequest(cmd, rt, sa) 287 int cmd; 288 register struct rtentry *rt; 289 struct sockaddr *sa; 290 { 291 register struct ifaddr *ifa; 292 struct sockaddr *dst; 293 struct ifnet *ifp, *oldifnet = ifnet; 294 295 if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == 0) || 296 ((ifp = ifa->ifa_ifp) == 0) || ((dst = rt_key(rt)) == 0)) 297 return; 298 if (ifa = ifaof_ifpforaddr(dst, ifp)) { 299 rt->rt_ifa = ifa; 300 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest) 301 ifa->ifa_rtrequest(cmd, rt, sa); 302 } 303 } 304 305 /* 306 * Mark an interface down and notify protocols of 307 * the transition. 308 * NOTE: must be called at splnet or eqivalent. 309 */ 310 if_down(ifp) 311 register struct ifnet *ifp; 312 { 313 register struct ifaddr *ifa; 314 315 ifp->if_flags &= ~IFF_UP; 316 for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next) 317 pfctlinput(PRC_IFDOWN, ifa->ifa_addr); 318 if_qflush(&ifp->if_snd); 319 rt_ifmsg(ifp); 320 } 321 322 /* 323 * Mark an interface up and notify protocols of 324 * the transition. 325 * NOTE: must be called at splnet or eqivalent. 326 */ 327 if_up(ifp) 328 register struct ifnet *ifp; 329 { 330 register struct ifaddr *ifa; 331 332 ifp->if_flags |= IFF_UP; 333 #ifdef notyet 334 /* this has no effect on IP, and will kill all iso connections XXX */ 335 for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next) 336 pfctlinput(PRC_IFUP, ifa->ifa_addr); 337 #endif notyet 338 rt_ifmsg(ifp); 339 } 340 341 /* 342 * Flush an interface queue. 343 */ 344 if_qflush(ifq) 345 register struct ifqueue *ifq; 346 { 347 register struct mbuf *m, *n; 348 349 n = ifq->ifq_head; 350 while (m = n) { 351 n = m->m_act; 352 m_freem(m); 353 } 354 ifq->ifq_head = 0; 355 ifq->ifq_tail = 0; 356 ifq->ifq_len = 0; 357 } 358 359 /* 360 * Handle interface watchdog timer routines. Called 361 * from softclock, we decrement timers (if set) and 362 * call the appropriate interface routine on expiration. 363 */ 364 if_slowtimo() 365 { 366 register struct ifnet *ifp; 367 int s = splimp(); 368 369 for (ifp = ifnet; ifp; ifp = ifp->if_next) { 370 if (ifp->if_timer == 0 || --ifp->if_timer) 371 continue; 372 if (ifp->if_watchdog) 373 (*ifp->if_watchdog)(ifp->if_unit); 374 } 375 splx(s); 376 timeout(if_slowtimo, (caddr_t)0, hz / IFNET_SLOWHZ); 377 } 378 379 /* 380 * Map interface name to 381 * interface structure pointer. 382 */ 383 struct ifnet * 384 ifunit(name) 385 register char *name; 386 { 387 register char *cp; 388 register struct ifnet *ifp; 389 int unit; 390 unsigned len; 391 char *ep, c; 392 393 for (cp = name; cp < name + IFNAMSIZ && *cp; cp++) 394 if (*cp >= '0' && *cp <= '9') 395 break; 396 if (*cp == '\0' || cp == name + IFNAMSIZ) 397 return ((struct ifnet *)0); 398 /* 399 * Save first char of unit, and pointer to it, 400 * so we can put a null there to avoid matching 401 * initial substrings of interface names. 402 */ 403 len = cp - name + 1; 404 c = *cp; 405 ep = cp; 406 for (unit = 0; *cp >= '0' && *cp <= '9'; ) 407 unit = unit * 10 + *cp++ - '0'; 408 *ep = 0; 409 for (ifp = ifnet; ifp; ifp = ifp->if_next) { 410 if (bcmp(ifp->if_name, name, len)) 411 continue; 412 if (unit == ifp->if_unit) 413 break; 414 } 415 *ep = c; 416 return (ifp); 417 } 418 419 /* 420 * Interface ioctls. 421 */ 422 ifioctl(so, cmd, data, p) 423 struct socket *so; 424 int cmd; 425 caddr_t data; 426 struct proc *p; 427 { 428 register struct ifnet *ifp; 429 register struct ifreq *ifr; 430 int error; 431 432 switch (cmd) { 433 434 case SIOCGIFCONF: 435 case OSIOCGIFCONF: 436 return (ifconf(cmd, data)); 437 438 #if defined(INET) && NETHER > 0 439 case SIOCSARP: 440 case SIOCDARP: 441 if (error = suser(p->p_ucred, &p->p_acflag)) 442 return (error); 443 /* FALL THROUGH */ 444 case SIOCGARP: 445 case OSIOCGARP: 446 return (arpioctl(cmd, data)); 447 #endif 448 } 449 ifr = (struct ifreq *)data; 450 ifp = ifunit(ifr->ifr_name); 451 if (ifp == 0) 452 return (ENXIO); 453 switch (cmd) { 454 455 case SIOCGIFFLAGS: 456 ifr->ifr_flags = ifp->if_flags; 457 break; 458 459 case SIOCGIFMETRIC: 460 ifr->ifr_metric = ifp->if_metric; 461 break; 462 463 case SIOCSIFFLAGS: 464 if (error = suser(p->p_ucred, &p->p_acflag)) 465 return (error); 466 if (ifp->if_flags & IFF_UP && (ifr->ifr_flags & IFF_UP) == 0) { 467 int s = splimp(); 468 if_down(ifp); 469 splx(s); 470 } 471 if (ifr->ifr_flags & IFF_UP && (ifp->if_flags & IFF_UP) == 0) { 472 int s = splimp(); 473 if_up(ifp); 474 splx(s); 475 } 476 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | 477 (ifr->ifr_flags &~ IFF_CANTCHANGE); 478 if (ifp->if_ioctl) 479 (void) (*ifp->if_ioctl)(ifp, cmd, data); 480 break; 481 482 case SIOCSIFMETRIC: 483 if (error = suser(p->p_ucred, &p->p_acflag)) 484 return (error); 485 ifp->if_metric = ifr->ifr_metric; 486 break; 487 488 #ifdef MULTICAST 489 case SIOCADDMULTI: 490 case SIOCDELMULTI: 491 if (error = suser(p->p_ucred, &p->p_acflag)) 492 return (error); 493 if (ifp->if_ioctl) 494 return (EOPNOTSUPP); 495 return ((*ifp->if_ioctl)(ifp, cmd, data)); 496 #endif 497 498 default: 499 if (so->so_proto == 0) 500 return (EOPNOTSUPP); 501 #ifndef COMPAT_43 502 return ((*so->so_proto->pr_usrreq)(so, PRU_CONTROL, 503 cmd, data, ifp)); 504 #else 505 { 506 int ocmd = cmd; 507 508 switch (cmd) { 509 510 case SIOCSIFDSTADDR: 511 case SIOCSIFADDR: 512 case SIOCSIFBRDADDR: 513 case SIOCSIFNETMASK: 514 #if BYTE_ORDER != BIG_ENDIAN 515 if (ifr->ifr_addr.sa_family == 0 && 516 ifr->ifr_addr.sa_len < 16) { 517 ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len; 518 ifr->ifr_addr.sa_len = 16; 519 } 520 #else 521 if (ifr->ifr_addr.sa_len == 0) 522 ifr->ifr_addr.sa_len = 16; 523 #endif 524 break; 525 526 case OSIOCGIFADDR: 527 cmd = SIOCGIFADDR; 528 break; 529 530 case OSIOCGIFDSTADDR: 531 cmd = SIOCGIFDSTADDR; 532 break; 533 534 case OSIOCGIFBRDADDR: 535 cmd = SIOCGIFBRDADDR; 536 break; 537 538 case OSIOCGIFNETMASK: 539 cmd = SIOCGIFNETMASK; 540 } 541 error = ((*so->so_proto->pr_usrreq)(so, PRU_CONTROL, 542 cmd, data, ifp)); 543 switch (ocmd) { 544 545 case OSIOCGIFADDR: 546 case OSIOCGIFDSTADDR: 547 case OSIOCGIFBRDADDR: 548 case OSIOCGIFNETMASK: 549 *(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family; 550 } 551 return (error); 552 553 } 554 #endif 555 } 556 return (0); 557 } 558 559 /* 560 * Return interface configuration 561 * of system. List may be used 562 * in later ioctl's (above) to get 563 * other information. 564 */ 565 /*ARGSUSED*/ 566 ifconf(cmd, data) 567 int cmd; 568 caddr_t data; 569 { 570 register struct ifconf *ifc = (struct ifconf *)data; 571 register struct ifnet *ifp = ifnet; 572 register struct ifaddr *ifa; 573 register char *cp, *ep; 574 struct ifreq ifr, *ifrp; 575 int space = ifc->ifc_len, error = 0; 576 577 ifrp = ifc->ifc_req; 578 ep = ifr.ifr_name + sizeof (ifr.ifr_name) - 2; 579 for (; space > sizeof (ifr) && ifp; ifp = ifp->if_next) { 580 bcopy(ifp->if_name, ifr.ifr_name, sizeof (ifr.ifr_name) - 2); 581 for (cp = ifr.ifr_name; cp < ep && *cp; cp++) 582 continue; 583 *cp++ = '0' + ifp->if_unit; *cp = '\0'; 584 if ((ifa = ifp->if_addrlist) == 0) { 585 bzero((caddr_t)&ifr.ifr_addr, sizeof(ifr.ifr_addr)); 586 error = copyout((caddr_t)&ifr, (caddr_t)ifrp, sizeof (ifr)); 587 if (error) 588 break; 589 space -= sizeof (ifr), ifrp++; 590 } else 591 for ( ; space > sizeof (ifr) && ifa; ifa = ifa->ifa_next) { 592 register struct sockaddr *sa = ifa->ifa_addr; 593 #ifdef COMPAT_43 594 if (cmd == OSIOCGIFCONF) { 595 struct osockaddr *osa = 596 (struct osockaddr *)&ifr.ifr_addr; 597 ifr.ifr_addr = *sa; 598 osa->sa_family = sa->sa_family; 599 error = copyout((caddr_t)&ifr, (caddr_t)ifrp, 600 sizeof (ifr)); 601 ifrp++; 602 } else 603 #endif 604 if (sa->sa_len <= sizeof(*sa)) { 605 ifr.ifr_addr = *sa; 606 error = copyout((caddr_t)&ifr, (caddr_t)ifrp, 607 sizeof (ifr)); 608 ifrp++; 609 } else { 610 space -= sa->sa_len - sizeof(*sa); 611 if (space < sizeof (ifr)) 612 break; 613 error = copyout((caddr_t)&ifr, (caddr_t)ifrp, 614 sizeof (ifr.ifr_name)); 615 if (error == 0) 616 error = copyout((caddr_t)sa, 617 (caddr_t)&ifrp->ifr_addr, sa->sa_len); 618 ifrp = (struct ifreq *) 619 (sa->sa_len + (caddr_t)&ifrp->ifr_addr); 620 } 621 if (error) 622 break; 623 space -= sizeof (ifr); 624 } 625 } 626 ifc->ifc_len -= space; 627 return (error); 628 } 629 630 static char * 631 sprint_d(n, buf, buflen) 632 u_int n; 633 char *buf; 634 int buflen; 635 { 636 register char *cp = buf + buflen - 1; 637 638 *cp = 0; 639 do { 640 cp--; 641 *cp = "0123456789"[n % 10]; 642 n /= 10; 643 } while (n != 0); 644 return (cp); 645 } 646