2 * Copyright 2000, International Business Machines Corporation and others.
5 * This software has been released under the terms of the IBM Public
6 * License. For details, see the LICENSE file in the top-level source
7 * directory or online at http://www.openafs.org/dl/license10.html
10 /* rx_user.c contains routines specific to the user space UNIX implementation of rx */
12 #include <afsconfig.h>
13 #include <afs/param.h>
18 # include <sys/types.h>
22 # include <WINNT/syscfg.h>
24 # include <sys/socket.h>
25 # include <sys/file.h>
27 # include <sys/stat.h>
28 # include <netinet/in.h>
29 # include <sys/time.h>
31 # include <sys/ioctl.h>
34 #if !defined(AFS_AIX_ENV) && !defined(AFS_NT40_ENV) && !defined(AFS_DJGPP_ENV)
35 # include <sys/syscall.h>
37 #include <afs/afs_args.h>
38 #include <afs/afsutil.h>
47 #ifndef IPPORT_USERRESERVED
48 /* If in.h doesn't define this, define it anyway. Unfortunately, defining
49 this doesn't put the code into the kernel to restrict kernel assigned
50 port numbers to numbers below IPPORT_USERRESERVED... */
51 #define IPPORT_USERRESERVED 5000
55 # include <sys/time.h>
58 # include "rx_globals.h"
60 #ifdef AFS_PTHREAD_ENV
64 * The rx_if_init_mutex mutex protects the following global variables:
68 pthread_mutex_t rx_if_init_mutex;
69 #define LOCK_IF_INIT assert(pthread_mutex_lock(&rx_if_init_mutex)==0)
70 #define UNLOCK_IF_INIT assert(pthread_mutex_unlock(&rx_if_init_mutex)==0)
73 * The rx_if_mutex mutex protects the following global variables:
79 pthread_mutex_t rx_if_mutex;
80 #define LOCK_IF assert(pthread_mutex_lock(&rx_if_mutex)==0)
81 #define UNLOCK_IF assert(pthread_mutex_unlock(&rx_if_mutex)==0)
84 #define UNLOCK_IF_INIT
87 #endif /* AFS_PTHREAD_ENV */
91 * Make a socket for receiving/sending IP packets. Set it into non-blocking
92 * and large buffering modes. If port isn't specified, the kernel will pick
93 * one. Returns the socket (>= 0) on success. Returns OSI_NULLSOCKET on
94 * failure. Port must be in network byte order.
97 rxi_GetHostUDPSocket(u_int ahost, u_short port)
100 osi_socket socketFd = OSI_NULLSOCKET;
101 struct sockaddr_in taddr;
102 char *name = "rxi_GetUDPSocket: ";
103 #ifdef AFS_LINUX22_ENV
104 int pmtu=IP_PMTUDISC_DONT;
107 #if !defined(AFS_NT40_ENV) && !defined(AFS_DJGPP_ENV)
108 if (ntohs(port) >= IPPORT_RESERVED && ntohs(port) < IPPORT_USERRESERVED) {
109 /* (osi_Msg "%s*WARNING* port number %d is not a reserved port number. Use port numbers above %d\n", name, port, IPPORT_USERRESERVED);
112 if (ntohs(port) > 0 && ntohs(port) < IPPORT_RESERVED && geteuid() != 0) {
114 "%sport number %d is a reserved port number which may only be used by root. Use port numbers above %d\n",
115 name, ntohs(port), IPPORT_USERRESERVED);
119 socketFd = socket(AF_INET, SOCK_DGRAM, 0);
126 taddr.sin_addr.s_addr = ahost;
127 taddr.sin_family = AF_INET;
128 taddr.sin_port = (u_short) port;
129 #ifdef STRUCT_SOCKADDR_HAS_SA_LEN
130 taddr.sin_len = sizeof(struct sockaddr_in);
132 #define MAX_RX_BINDS 10
133 for (binds = 0; binds < MAX_RX_BINDS; binds++) {
136 code = bind(socketFd, (struct sockaddr *)&taddr, sizeof(taddr));
142 (osi_Msg "%sbind failed\n", name);
145 #if !defined(AFS_NT40_ENV) && !defined(AFS_DJGPP_ENV)
147 * Set close-on-exec on rx socket
149 fcntl(socketFd, F_SETFD, 1);
152 #ifndef AFS_DJGPP_ENV
153 /* Use one of three different ways of getting a socket buffer expanded to
161 len2 = rx_UdpBufSize;
164 (socketFd, SOL_SOCKET, SO_RCVBUF, (char *)&len2,
167 len2 = 32766; /* fall back to old size... uh-oh! */
172 (socketFd, SOL_SOCKET, SO_SNDBUF, (char *)&len1,
176 (socketFd, SOL_SOCKET, SO_RCVBUF, (char *)&len2,
179 (osi_Msg "%s*WARNING* Unable to increase buffering on socket\n",
181 MUTEX_ENTER(&rx_stats_mutex);
182 rx_stats.socketGreedy = greedy;
183 MUTEX_EXIT(&rx_stats_mutex);
185 #endif /* AFS_DJGPP_ENV */
187 #ifdef AFS_LINUX22_ENV
188 setsockopt(socketFd, SOL_IP, IP_MTU_DISCOVER, &pmtu, sizeof(pmtu));
191 if (rxi_Listen(socketFd) < 0) {
200 closesocket(socketFd);
206 return OSI_NULLSOCKET;
210 rxi_GetUDPSocket(u_short port)
212 return rxi_GetHostUDPSocket(htonl(INADDR_ANY), port);
216 osi_Panic(char *msg, int a1, int a2, int a3)
218 (osi_Msg "Fatal Rx error: ");
219 (osi_Msg msg, a1, a2, a3);
226 * osi_AssertFailU() -- used by the osi_Assert() macro.
230 osi_AssertFailU(const char *expr, const char *file, int line)
232 osi_Panic("assertion failed: %s, file: %s, line: %d\n", (int)expr,
238 static const char memZero;
240 osi_Alloc(afs_int32 x)
243 * 0-length allocs may return NULL ptr from osi_kalloc, so we special-case
244 * things so that NULL returned iff an error occurred
248 return ((char *)malloc(x));
252 osi_Free(char *x, afs_int32 size)
259 #endif /* AFS_AIX32_ENV */
261 #define ADDRSPERSITE 16
264 afs_uint32 rxi_NetAddrs[ADDRSPERSITE]; /* host order */
265 static int myNetMTUs[ADDRSPERSITE];
266 static int myNetMasks[ADDRSPERSITE];
267 static int myNetFlags[ADDRSPERSITE];
268 u_int rxi_numNetAddrs;
269 static int Inited = 0;
271 #if defined(AFS_NT40_ENV) || defined(AFS_DJGPP_ENV)
275 if (rxi_numNetAddrs > 0)
276 return htonl(rxi_NetAddrs[0]);
282 ** return number of addresses
283 ** and the addresses themselves in the buffer
284 ** maxSize - max number of interfaces to return.
287 rx_getAllAddr(afs_int32 * buffer, int maxSize)
290 for (count = 0; count < rxi_numNetAddrs && maxSize > 0;
292 buffer[count] = htonl(rxi_NetAddrs[count]);
311 int npackets, ncbufs;
316 rxi_numNetAddrs = ADDRSPERSITE;
319 (void)syscfg_GetIFInfo(&rxi_numNetAddrs, rxi_NetAddrs,
320 myNetMasks, myNetMTUs, myNetFlags);
322 for (i = 0; i < rxi_numNetAddrs; i++) {
323 rxsize = rxi_AdjustIfMTU(myNetMTUs[i] - RX_IPUDP_SIZE);
325 rxi_nRecvFrags * rxsize + (rxi_nRecvFrags - 1) * UDP_HDR_SIZE;
326 maxsize = rxi_AdjustMaxMTU(rxsize, maxsize);
327 if (rx_maxReceiveSize < maxsize) {
328 rx_maxReceiveSize = MIN(RX_MAX_PACKET_SIZE, maxsize);
330 MIN(rx_maxReceiveSize, rx_maxReceiveSizeUser);
335 ncbufs = (rx_maxJumboRecvSize - RX_FIRSTBUFFERSIZE);
337 ncbufs = ncbufs / RX_CBUFFERSIZE;
338 npackets = rx_initSendWindow - 1;
339 rxi_MorePackets(npackets * (ncbufs + 1));
347 fudge_netmask(afs_uint32 addr)
353 else if (IN_CLASSB(addr))
355 else if (IN_CLASSC(addr))
365 #if !defined(AFS_AIX_ENV) && !defined(AFS_NT40_ENV) && !defined(AFS_LINUX20_ENV) && !defined(AFS_DJGPP_ENV)
367 rxi_syscall(a3, a4, a5)
374 old = (void (*)())signal(SIGSYS, SIG_IGN);
376 #if defined(AFS_SGI_ENV)
377 rcode = afs_syscall(a3, a4, a5);
379 rcode = syscall(AFS_SYSCALL, 28 /* AFSCALL_CALL */ , a3, a4, a5);
380 #endif /* AFS_SGI_ENV */
386 #endif /* AFS_AIX_ENV */
394 #ifndef AFS_DJGPP_ENV
396 struct ifreq ifs[ADDRSPERSITE];
399 char buf[BUFSIZ], *cp, *cplim;
401 struct sockaddr_in *a;
402 #endif /* AFS_DJGPP_ENV */
413 memset(rxi_NetAddrs, 0, sizeof(rxi_NetAddrs));
414 memset(myNetFlags, 0, sizeof(myNetFlags));
415 memset(myNetMTUs, 0, sizeof(myNetMTUs));
416 memset(myNetMasks, 0, sizeof(myNetMasks));
418 s = socket(AF_INET, SOCK_DGRAM, 0);
422 #ifndef AFS_DJGPP_ENV
424 ifc.ifc_len = sizeof(buf);
428 ifc.ifc_len = sizeof(ifs);
429 ifc.ifc_buf = (caddr_t) & ifs[0];
430 memset(&ifs[0], 0, sizeof(ifs));
432 res = ioctl(s, SIOCGIFCONF, &ifc);
434 /* fputs(stderr, "ioctl error IFCONF\n"); */
441 #define size(p) MAX((p).sa_len, sizeof(p))
442 cplim = buf + ifc.ifc_len; /*skip over if's with big ifr_addr's */
443 for (cp = buf; cp < cplim;
444 cp += sizeof(ifr->ifr_name) + MAX(a->sin_len, sizeof(*a))) {
445 if (rxi_numNetAddrs >= ADDRSPERSITE)
448 ifr = (struct ifreq *)cp;
450 len = ifc.ifc_len / sizeof(struct ifreq);
451 if (len > ADDRSPERSITE)
454 for (i = 0; i < len; ++i) {
456 res = ioctl(s, SIOCGIFADDR, ifr);
459 /* fputs(stderr, "ioctl error IFADDR\n");
460 * perror(ifr->ifr_name); */
463 a = (struct sockaddr_in *)&ifr->ifr_addr;
464 if (a->sin_family != AF_INET)
466 rxi_NetAddrs[rxi_numNetAddrs] = ntohl(a->sin_addr.s_addr);
467 if (rxi_NetAddrs[rxi_numNetAddrs] == 0x7f000001) {
468 /* we don't really care about "localhost" */
471 for (j = 0; j < rxi_numNetAddrs; j++) {
472 if (rxi_NetAddrs[j] == rxi_NetAddrs[rxi_numNetAddrs])
475 if (j < rxi_numNetAddrs)
478 /* fprintf(stderr, "if %s addr=%x\n", ifr->ifr_name,
479 * rxi_NetAddrs[rxi_numNetAddrs]); */
482 res = ioctl(s, SIOCGIFFLAGS, ifr);
484 myNetFlags[rxi_numNetAddrs] = ifr->ifr_flags;
486 /* Handle aliased loopbacks as well. */
487 if (ifr->ifr_flags & IFF_LOOPBACK)
490 /* fprintf(stderr, "if %s flags=%x\n",
491 * ifr->ifr_name, ifr->ifr_flags); */
493 * fputs(stderr, "ioctl error IFFLAGS\n");
494 * perror(ifr->ifr_name); */
496 #endif /* SIOCGIFFLAGS */
498 #if !defined(AFS_AIX_ENV) && !defined(AFS_LINUX20_ENV)
499 /* this won't run on an AIX system w/o a cache manager */
500 rxi_syscallp = rxi_syscall;
503 /* If I refer to kernel extensions that aren't loaded on AIX, the
504 * program refuses to load and run, so I simply can't include the
505 * following code. Fortunately, AIX is the one operating system in
506 * which the subsequent ioctl works reliably. */
508 if ((*rxi_syscallp) (20 /*AFSOP_GETMTU */ ,
509 htonl(rxi_NetAddrs[rxi_numNetAddrs]),
510 &(myNetMTUs[rxi_numNetAddrs]))) {
511 /* fputs(stderr, "syscall error GETMTU\n");
512 * perror(ifr->ifr_name); */
513 myNetMTUs[rxi_numNetAddrs] = 0;
515 if ((*rxi_syscallp) (42 /*AFSOP_GETMASK */ ,
516 htonl(rxi_NetAddrs[rxi_numNetAddrs]),
517 &(myNetMasks[rxi_numNetAddrs]))) {
518 /* fputs(stderr, "syscall error GETMASK\n");
519 * perror(ifr->ifr_name); */
520 myNetMasks[rxi_numNetAddrs] = 0;
522 myNetMasks[rxi_numNetAddrs] =
523 ntohl(myNetMasks[rxi_numNetAddrs]);
524 /* fprintf(stderr, "if %s mask=0x%x\n",
525 * ifr->ifr_name, myNetMasks[rxi_numNetAddrs]); */
528 if (myNetMTUs[rxi_numNetAddrs] == 0) {
529 myNetMTUs[rxi_numNetAddrs] = OLD_MAX_PACKET_SIZE + RX_IPUDP_SIZE;
531 res = ioctl(s, SIOCGIFMTU, ifr);
532 if ((res == 0) && (ifr->ifr_metric > 128)) { /* sanity check */
533 myNetMTUs[rxi_numNetAddrs] = ifr->ifr_metric;
534 /* fprintf(stderr, "if %s mtu=%d\n",
535 * ifr->ifr_name, ifr->ifr_metric); */
537 /* fputs(stderr, "ioctl error IFMTU\n");
538 * perror(ifr->ifr_name); */
543 if (myNetMasks[rxi_numNetAddrs] == 0) {
544 myNetMasks[rxi_numNetAddrs] =
545 fudge_netmask(rxi_NetAddrs[rxi_numNetAddrs]);
546 #ifdef SIOCGIFNETMASK
547 res = ioctl(s, SIOCGIFNETMASK, ifr);
549 a = (struct sockaddr_in *)&ifr->ifr_addr;
550 myNetMasks[rxi_numNetAddrs] = ntohl(a->sin_addr.s_addr);
551 /* fprintf(stderr, "if %s subnetmask=0x%x\n",
552 * ifr->ifr_name, myNetMasks[rxi_numNetAddrs]); */
554 /* fputs(stderr, "ioctl error IFMASK\n");
555 * perror(ifr->ifr_name); */
560 if (rxi_NetAddrs[rxi_numNetAddrs] != 0x7f000001) { /* ignore lo0 */
563 rxi_nRecvFrags * (myNetMTUs[rxi_numNetAddrs] - RX_IP_SIZE);
564 maxsize -= UDP_HDR_SIZE; /* only the first frag has a UDP hdr */
565 if (rx_maxReceiveSize < maxsize)
566 rx_maxReceiveSize = MIN(RX_MAX_PACKET_SIZE, maxsize);
573 /* have to allocate at least enough to allow a single packet to reach its
574 * maximum size, so ReadPacket will work. Allocate enough for a couple
575 * of packets to do so, for good measure */
577 int npackets, ncbufs;
579 rx_maxJumboRecvSize =
580 RX_HEADER_SIZE + rxi_nDgramPackets * RX_JUMBOBUFFERSIZE +
581 (rxi_nDgramPackets - 1) * RX_JUMBOHEADERSIZE;
582 rx_maxJumboRecvSize = MAX(rx_maxJumboRecvSize, rx_maxReceiveSize);
583 ncbufs = (rx_maxJumboRecvSize - RX_FIRSTBUFFERSIZE);
585 ncbufs = ncbufs / RX_CBUFFERSIZE;
586 npackets = rx_initSendWindow - 1;
587 rxi_MorePackets(npackets * (ncbufs + 1));
590 #else /* AFS_DJGPP_ENV */
593 #endif /* AFS_DJGPP_ENV */
595 #endif /* AFS_NT40_ENV */
597 /* Called from rxi_FindPeer, when initializing a clear rx_peer structure,
598 * to get interesting information.
599 * Curiously enough, the rx_peerHashTable_lock currently protects the
600 * Inited variable (and hence rx_GetIFInfo). When the fs suite uses
601 * pthreads, this issue will need to be revisited.
605 rxi_InitPeerParams(struct rx_peer *pp)
617 * there's a race here since more than one thread could call
618 * rx_GetIFInfo. The race stops in rx_GetIFInfo.
626 /* try to second-guess IP, and identify which link is most likely to
627 * be used for traffic to/from this host. */
628 ppaddr = ntohl(pp->host);
632 pp->rateFlag = 2; /* start timing after two full packets */
633 /* I don't initialize these, because I presume they are bzero'd...
634 * pp->burstSize pp->burst pp->burstWait.sec pp->burstWait.usec
635 * pp->timeout.usec */
638 for (ix = 0; ix < rxi_numNetAddrs; ++ix) {
639 if ((rxi_NetAddrs[ix] & myNetMasks[ix]) == (ppaddr & myNetMasks[ix])) {
640 #ifdef IFF_POINTOPOINT
641 if (myNetFlags[ix] & IFF_POINTOPOINT)
643 #endif /* IFF_POINTOPOINT */
644 rxmtu = myNetMTUs[ix] - RX_IPUDP_SIZE;
645 if (rxmtu < RX_MIN_PACKET_SIZE)
646 rxmtu = RX_MIN_PACKET_SIZE;
647 if (pp->ifMTU < rxmtu)
648 pp->ifMTU = MIN(rx_MyMaxSendSize, rxmtu);
652 if (!pp->ifMTU) { /* not local */
654 pp->ifMTU = MIN(rx_MyMaxSendSize, RX_REMOTE_PACKET_SIZE);
656 #else /* ADAPT_MTU */
657 pp->rateFlag = 2; /* start timing after two full packets */
659 pp->ifMTU = MIN(rx_MyMaxSendSize, OLD_MAX_PACKET_SIZE);
660 #endif /* ADAPT_MTU */
661 pp->ifMTU = rxi_AdjustIfMTU(pp->ifMTU);
662 pp->maxMTU = OLD_MAX_PACKET_SIZE; /* for compatibility with old guys */
663 pp->natMTU = MIN((int)pp->ifMTU, OLD_MAX_PACKET_SIZE);
664 pp->maxDgramPackets =
665 MIN(rxi_nDgramPackets,
666 rxi_AdjustDgramPackets(RX_MAX_FRAGS, pp->ifMTU));
668 MIN(rxi_nDgramPackets,
669 rxi_AdjustDgramPackets(RX_MAX_FRAGS, pp->ifMTU));
670 pp->maxDgramPackets = 1;
671 /* Initialize slow start parameters */
672 pp->MTU = MIN(pp->natMTU, pp->maxMTU);
674 pp->nDgramPackets = 1;
678 /* Don't expose jumobgram internals. */
682 rx_maxReceiveSize = OLD_MAX_PACKET_SIZE;
683 rxi_nSendFrags = rxi_nRecvFrags = 1;
686 /* Override max MTU. If rx_SetNoJumbo is called, it must be
687 called before calling rx_SetMaxMTU since SetNoJumbo clobbers rx_maxReceiveSize */
689 rx_SetMaxMTU(int mtu)
691 rx_MyMaxSendSize = rx_maxReceiveSizeUser = rx_maxReceiveSize = mtu;